Principle and composition of multihead weigher design scheme for sedan

Author: Smartweigh–Multihead Weighter

The electronic floor scale is based on the basic principle of strain force measurement. A strain gauge is attached to the polyurethane elastomer of the multihead weigher to form a Wheatstone bridge. At zero load, the bridge circuit is in a balanced state and the output is zero. When the polyurethane elastomer bears the load, the size of the additional load can be measured from the output voltage as each strain gauge causes a strain force proportional to the load.

Install several multihead weighers directly under the weighing platform, lead several sensor cables to the terminal block in series, and then use a cable to connect the instrument panel. When the car rides on the scale platform, the scale platform transmits the force to each multihead weigher, which changes the resistors of the strain force bridge circuit, causing the output voltage to change, that is, outputting an electronic signal, which is transmitted to the In the instrument panel, after digital filtering, line shape enlargement, A/D conversion, and CPU resolution, the final display information weighing scale value. In addition to its basic structure, the electronic floor scale can be connected to other electrical equipment such as microcomputers, copiers, large-screen displays and other electrical equipment according to the instrument panel. Maintain the instrument panel and ensure that the weighing data information is not easy to turn off the power and lose it. It can be equipped with UPSups power supply, adjustable regulated power supply and other machinery and equipment, which is convenient for the system software to work more reliably.

2.2 Introduction of basic structure and technical characteristics The electronic platform scale is mainly composed of four parts: weighing platform, multihead weigher, instrument panel and basic. 2.2.1 Weighing platform 2.2.1.1 Scale body structure The electronic floor scale adopts a modular design weighing platform to form a design scheme, and the composition of different control modules can complete electronic truck scales of various specifications and models; the overall structure of the electronic truck scale weighing platform The design scheme without rear cover is adopted, and the surface has no theme activity rear cover, which gets rid of the defects of rust and easy breakage of the anchor bolts of the rear cover, and the overall appearance design is unique; the sensor support point of the scale body overlaps with the bearing point, Then the rotational torque caused by the axle load is zero, and the center of gravity is more stable after the weighing platform bears the force; the limit switch of the electronic truck scale adopts the external hanging type, which is installed on both sides of the electronic truck scale, which is convenient to observe the limit switch of the electronic truck scale. Check the status of the position switch, and deal with the problems such as the measurement and verification error of the electronic truck scale caused by the loosening and jamming of the limit switch equipment in a timely manner. The development trend of the scale platform Historical time The electronic floor scale platform structure produced by Tianxing Company is a box-type structure made of thick steel plate and round steel welded by electric welding. The development trend of the year, the structure of the electronic truck scale platform has experienced three generations of development trend evolution as a whole.

The first generation of electronic truck scales manufactured in the late 1980s consisted of three sections of weighing platform 1, 2, and 3 lapped by steel bars. With the development trend of economic development and the change of transportation vehicle types, its key defects depend on The left and right scale platforms of the large-cargo car can easily cause one end of the first section of the scale platform to stick out, and then fall down and smash the sensor. According to the defects of the first generation of electronic truck scales, the second generation of electronic truck scales was designed and developed in the mid-to-late 1990s, and in 1998, it was awarded a national-level new product by the State Economic Commission. The second-generation product uses the central weighing platform as the main weighing platform, and the auxiliary weighing platforms on both sides are respectively connected to the main weighing platform, thus solving the problem that one end of the weighing platform is upturned.

The second-generation electronic truck scale products are also widely used in key weighing and measurement verification machinery and equipment in various fields such as coal, power engineering, metallurgical industry, seaports, and mining. As everyone knows, due to the continuous increase in the number of vehicles, the application customers of the second-generation electronic truck scale also found many problems in the application and gave feedback home. For example, the anchor bolts of the rear cover plate on the surface of the electronic truck scale platform are easy to rust and reach the ground. The heads of the foot bolts are ground flat, and it is not easy to remove during maintenance; the limit switch of the electronic truck scale is built-in, so it is not easy to observe and clear the problem in normal times; the gap between the scale platform is easy to leak smoke and dust, and it is easy to deposit for a long time. At the bottom of the weighing platform, it will endanger the weighing and measurement verification of the truck scale. In addition, due to the lack of reasonable plan planning at the level of standardization and generalization, it is also unfavorable for large-scale mass production in the processing process.

According to some problems of the second-generation electronic truck scale, in 2003, our company developed and designed the third-generation modular design electronic platform scale. The third-generation modular design electronic platform scale adopts modular design, integration, The design concept of standardized, generalized and parametric design enables it to fully meet the application requirements of customers. Its main features are: a. Modular design, standardized and integrated design scheme: The third-generation modular design electronic platform scale is assembled and assembled by three long and short structures of 5 meters, 6 meters and 7 meters. For example, a 15-meter-long electronic truck scale consists of a three-stage weighing platform of 5 meters + 5 meters + 5 meters.

b. Parametric modeling: Parametric modeling is used as a whole for modular design of electronic weighbridges, for example: SCS-100/80 series product modular design electronic weighbridges 10-21 meters long are reflected in the general drawing as two engineering drawings, 10 , 12, 14 meters in length (two-section weighing platform) are reflected in a project drawing, 15, 16, 18, 21 meters in length (three-section weighing platform) are reflected in a project drawing. Among the performance parameters of the electronic truck scale, they are the model specification of the electronic truck scale and the cabinet table specification L.×W (long×width), basic drawing number, weighing platform drawing number. L1, L2, and W respectively mean the distance of the sensor, and the same is true for the basic diagram.

At this stage, all electronic weighbridges of modular design have completed parametric modeling (see Figure 2-3). c. Structural design scheme without cover plate: According to the current situation of electronic platform scales manufactured by Chinese competitors, Tianxing is the only manufacturer that guarantees the design scheme without rear cover plate. The surface of the weighing platform is a whole tablet computer, which has not opened its mouth, which completely eliminates the defects such as rust and easy breakage of the anchor bolts of the rear cover.

The national patent number for this product is ZL02269296.7. d. The fulcrum of the weighing platform overlaps with the lap receiving support point: that is, the torque arm of the weighing platform is zero, and there is no possibility that one end of the weighing platform will be upturned, which is more stable after the weighing platform bears the force. e. The limit switch equipment adopts the external hanging type: it is convenient for immediate inspection during normal application and maintenance, which can reasonably avoid weighing errors caused by the stuck limit switch.

(During the construction, the secondary irrigation of the original limit switch is reduced, which saves the time for the service project staff to cooperate with each other and service projects on the spot, that is to say, the high efficiency is improved.) f. The gap between the weighing platform and the weighing platform can be manipulated In the middle of 0~3mm, it can reasonably prevent smoke and dust from falling into the audience seat of the scale from the gap. g. The connecting anchor bolts between the weighing platform and the weighing platform are changed to external side installation, which solves the problem that the original middle connecting anchor bolts are not easy to install and tighten on the spot due to the small indoor space.

The third-generation electronic truck scale has been fully invested in production and manufacturing since 2002, and has gradually replaced the second-generation electronic truck scale products, because its own innovation and advantages have been adopted by many customers. 2.2.1.2 Anti-fouling function Modular design The electronic platform scale product adopts anti-fouling solution on both sides and around the scale body to ensure all normal measurement and verification characteristics, so as to reasonably prevent dust and dirt from entering the bottom of the scale body. Refit safety shock-absorbing rubber pads and high wear-resistance belts on the front, rear, left and right sides of the scale body. The high wear-resistance belts are laid on the scale platform and the base to completely cover the gap between the scale platform and the base, and the high wear-resistance belts Lay it on the basic end and press it with a safety shock-absorbing rubber pad, and fix it on the concrete base according to the expansion screw. The safety shock-absorbing rubber pad can reduce the speed per hour, ease the impact on the scale body, and ensure safety. drive.

The gap between the scale body and the base on both sides of the electronic truck scale is specially made.“T”Type rubber products carry out anti-fouling solutions, and various series of products have different overall widths and thicknesses.“T”Type rubber products can be applied to various gaps for sealing. Safety shock-absorbing rubber pads, wear-resistant rubber sheets, and T-shaped rubber products can be easily installed and replaced. 2.2.1.3 Modular design of ground anti-skid characteristics The electronic platform scale adopts a unique and reasonable ground anti-skid design scheme, that is, a layer of δ4 high-quality patterned steel plate is applied directly under the wheel reels by intermittent welding and plug welding methods to produce ground anti-skid. Safe passage, to avoid the situation that the car's upper balance deviates in rainy and snowy weather.

The anti-skid pattern steel plate on the ground can be easily removed after grinding, and it can be removed and replaced again. The anti-slip effect of the stable ground increases the service life of the weighing platform. 2.2.1.4 Modular design of anti-corrosion characteristics The raw materials of the electronic platform scale commodity weighing platform are made of high-quality hot-rolled steel and plate, and its composition and physical properties meet the requirements of GB700-88 "Technical Conditions for Ordinary Carbon Structural Steel".

All steel surfaces are subjected to preparatory treatment such as shot blasting and rust removal before processing, to remove oxide scale, rust and dirt on the surface of stainless steel plates, and the anti-rust treatment should be done in accordance with GB8923-88 "Steel Surface Corrosion Grade and Rust Removal Grade before Coating" Sa2 .5 level. After all raw materials are pre-processed, paint a layer of epoxy zinc-rich primer immediately, and then apply epoxy zinc-rich primer and epoxy resin paint before the entire machine factory, and the same paint color tone does not exceed one color cast. 2.2.1.5 Modular design of physical properties All electronic weighbridge products use excellent design schemes such as CAD and CAE, and electronic computers are used for the design scheme of the weighing platform to carry out the analysis and calculation of the bending stiffness and compressive strength of the scale body to ensure the bearing capacity of the load platform. Effective, with excellent bending stiffness and compressive strength, the safety load of the weighing platform exceeds 125% FS, ensuring that the electronic truck scale has an excellent application safety factor and long-term reliability.

2.2.1.6 Production and processing technology Because the stress of hot rolled round steel is far lower than that of cold drawn round steel, its structural reliability is good, so the weighing platform of our company's modular design electronic floor scale products is made of channel steel and thick steel plate welded into a frame box by electric welding shape structure. It is produced and processed by equipment such as CO2 gas shielded welding and submerged arc automatic welding machine to ensure sufficient welding depth. The surface treatment of electric welding welding metal is smooth and smooth, and there are no defects such as vent holes, welding flashes, cracks, etc., to ensure the welding quality of electric welding.

The design and manufacture of the project are in full compliance with GB50205-95 "Code for Construction and Acceptance of Steel Structure Engineering". 2.2.1.7 Safety protection design scheme Modular design Electronic weighbridge commodity sensor wiring all use safety protection design scheme, and the wiring in the middle of the metal material conduit adopts plastic-coated hose safety protection, and unnecessary cables will be placed together with the terminals In the closed box body, the mechanical equipment damage or rat bite of the sensor cable is reasonably prevented from causing errors in the measurement and verification characteristics of the electronic truck scale, and the fraudulent personal behavior of human factors and other factors on the sensor cable is avoided. 2.2.1.8 The characteristics of anti-interference, high-voltage electric shock, and lightning strikes are modularized. The basic design scheme of electronic platform scale product structure conforms to GB50057-94 "Building Lightning Protection Design Code" and GB64-83 "Overvoltage Protection Design of Industrial and Civil Power Installations" "Specification" stipulates that the design scheme has an excellent grounding grid, the resistance of the grounding wire is lower than 4Ω, and the weighing platform is connected to the grounding grid according to the special wire connector.

When the sensor is installed, a multi-core hand-braided copper core wire jumper wire is selected to make the connection between the basic board and the weighing platform become an equipotential body, so as to avoid the damage of the sensor due to the accidental current passing through the sensor. The terminals are anti-surge terminals, and the casing is made of die-cast aluminum, with a waterproof rating of IP55. Fine anti-surge electronic components are used for welding on the terminal block, which can reasonably avoid the damage of lightning strike and power grid pulse current to the inductor.

The instrument panel has an independent grounding device. 2.2.1.9 Patent rights Application of modular design The electronic weighbridge product selects 8 high-precision multihead weighers of the accumulation chain, and uses our company's patent right "Electronics of multiple multihead weighers" (patent number: 91221886X) in the design scheme, which can reduce the When the temperature changes, the thermal expansion and contraction of the weighing platform will affect the bearing capacity of the multihead weigher, so as to ensure the accuracy of the measurement and verification of the all-electronic platform scale. The modular design of the electronic weighbridge product generally adopts the coverless structure design scheme, and the national patent number for this product is ZL02269296.7.

According to the current status of electronic platform scales manufactured by Chinese competitors, Tianxing is the only manufacturer that guarantees no back cover design. The surface of the weighing platform is a whole tablet computer, which has not opened its mouth, which completely eliminates the defects such as rust and easy breakage of the anchor bolts of the rear cover. 2.2.2multihead weigher The electronic platform scale adopts the multihead weigher of the high-precision accumulation and release chain of BM-LS series products.

This type of sensor is the core sensor product that our company introduced into Japan's Kubota company's fully automatic equipment and technically self-manufactured. Products with excellent titles have the largest market share in the same industry across the country. The multihead weigher is used in well-known carbon steel manufacturing enterprises in my country——Daye Iron and Steel Plant specializes in the raw materials for the smelting plant of our company, and its composition consistency is very high; the CNC lathes purchased by the British Cincinnati company and the Japanese OKK company are used for machining and manufacturing, and the specifications of each part are highly consistent; The industrial furnace for high heat treatment processing has precise process control parameters and high consistency of internal mechanisms; it uses the zero-point temperature tank and the dynamometer with temperature tank produced by Shimagawa, a well-known Japanese manufacturer of temperature chambers, to carry out two-way compensation. (zero point and sensitivity temperature compensation), the consistency of its temperature characteristics is very high. Because of the application of the above technical equipment and advanced technology, the multihead weigher manufactured by our company can ensure high accuracy and strong tolerance in a wide temperature range of -40 ~ +70 ° C.

Its fatigue life can still maintain the original performance index level (see accessories) after 1,500,000 experiments by the testing center of Shandong University (former Shandong University of Technology). Our company's electronic truck scale products have been using BM-LS type accumulation and release chain sensors (see picture). The accumulation and release chain sensor adopts the distinctive double-cut beam structure with two support points on both sides and the middle bearing force. The force transmission components use tensile force and bearing steel ball to transmit force. Steel ball connection, with excellent automatic repair torque, ensuring vertical bearing force under all conditions, high reliability and repeatability, able to stabilize the weighing platform in the shortest period, impact resistance and lateral force resistance characteristics Excellent, easy to install and adjust, no fixed torque is required, and the waterproof level is IP68. With the advent of the digital age, our company has developed and designed an intelligent multihead weigher.

The intelligent multihead weigher originally simulates the analog sensor with AD conversion equipment and CPU CPU. The electronic signal caused by the multihead weigher's endurance means that the sensor is converted into an analog signal, and the RS485 socket is used to transmit the analog signal. The transmission distance is not less than one kilometer, and the ability to resist external interference is strong. Electronic information technology is used to complete the self-compensation of the main parameters such as the discrete system and compressive strength characteristics of the sensor. During the calibration of the electronic truck scale, the main parameters of the sensor are entered at one time during the wheel weight calibration for automatic calibration. It cannot be calibrated again, so digital truck scales equipped with intelligent sensors will be the key development trend in the future. The digital and analog electronic weighbridge is equipped with an analog and analog accumulation chain sensor, and the digital display electronic weighbridge is equipped with a digital display accumulation chain sensor.

The selection of the measurement range of the multihead weigher mainly takes into account the weight of the scale body and its vibration, impact, wheel weight and other conditions. 2.2.3 Weighing display instrument The electronic platform scale is equipped with a weighing display instrument (hereinafter referred to as the instrument panel), which is a multihead weigher table independently produced by Tianxing Weighing Equipment Enterprise. The overall characteristics of the instrument panel are better than those of the same industry in China. The instrument panel adopts imported high-end important components, has excellent industrial touch screen, complete functions, reliable characteristics, strong reliability, simple operation, and is suitable for static data and dynamic measurement verification.

Automatically save the net weight of vehicles entering and leaving the customs supervision station and interface, with the functions of net weight, net weight, tare weight, overweight, zero setting, peeling, automatic zero tracking and other message reminders, etc. The computer keyboard can be set, marked, and linear. Adjustment, with time, time, power off, personal information protection and self-diagnosis, automatic copying of weighing data information, continuous command method output data information, dynamic and static data weighing data information can be automatically transmitted to electronic computers, etc. The equipment can be programmed with a computer keyboard and has a variety of socket functions. It can provide reliable weighing transmission data to the China Customs Freight Logistics Video Monitoring System, and can provide relative service support according to the regulations of the system integrator. The product has convenient static and dynamic weighing transformation, accurate reminder, and conforms to GB/T7724-99 "Technical Conditions for Weighing Display Controller". The key functions are: Peeling function: including manual, automatic peeling, and data peeling . ●It has the effect of accumulation and reduction, and has 50 classification accumulations.

●Coding function, 50 groups of codes can set tare weight, upper and lower limit of metrological verification, under-amount, over-amount, and identification. ●Storage function can record 1200 groups of weighing data information, store 400 vehicle license plate numbers, and can carry out record and vehicle number query. ●It has the function of data calibration.

●Have the function of client program writing. ●Digital clock display information, automatic generation function. ●A variety of copy functions, the instrument panel can be connected to most of the 9-pin, 24-pin, and 80-row copiers immediately, and can use the ESC/P copy operation code to complete Chinese and English copying.

●Various socket functions. RS-232C socket, 50mA current loop, print port. It can complete the functions of microcomputer management method, communication between two computers, and online.

●The use of watchdog circuit ensures that the instrument panel is working normally. ●Static data dynamic metrological verification conversion function. ●The control panel has a seal hole, which is convenient to carry out the main parameter programming, electronic calibration and equipment management methods.

Detailed technical specifications of the performance indicators of the instrument panel and instructions for the use of the instrument panel. Dynamic and static dual-purpose weighing display instrument Static data measurement verification, dynamic measurement verification is convenient to convert: static data is converted to dynamic, just need to press and hold on the dashboard in the car“Sure”key, additionally press and hold“4”key, the instrument panel immediately enters the dynamic metrology verification, in addition, the main display information dialog box dynamic metrology verification display light is on, the main display information dialog box displays the information dynamic weighing average value; when the dynamic weighing method is withdrawn, just press“Sure”key. 2.2.4 is basically a key component of the electronic truck scale, and the quality of the basic construction quality immediately jeopardizes the accuracy of the electronic truck scale.

The basic structure of the electronic truck scale is divided into two types: no deep foundation pit and deep foundation pit (see Figure 2-6). The customer needs to read the relevant technical standards of the article in detail according to the reasonable basic engineering drawings presented by the company, integrate the geological standards on the spot, and carry out the engineering drawing design plan by the design enterprise with civil engineering design qualification, and clarify the basic structure (basic depth, building steel bar) Construction lofting, concrete marking and thickness, construction sequence, etc.), and then the customer finds an engineering construction company with qualification certificates to carry out engineering construction. 2.2.4.1 Construction regulations for basic foundation works a. The design elevation specifications on the basic drawings presented by the company are in meters, and other specifications are in mm. The basic actual specifications are shown in the basic data chart (1).

In Table (1), L and W are the cabinet table specifications of the electronic truck scale, and L1, L2, and W are the installation specifications of the multihead weigher. b. Basically use 3:7 Panax notoginseng lime soil, and the plain soil below Panax notoginseng lime soil should be compacted, and the bearing capacity (ground physical force) shall not be less than 12t/m2. If the on-site geological standard cannot meet this requirement, structural reinforcement must be carried out. solve. The front, rear, left and right inclined approach roads shall be constructed separately from the basic separation project, and independent downward movement is not allowed after each bearing the key load.

c. Make sure that the electronic truck scale is not easily flooded into the water due to heavy rain or other reasons. For deep foundation pits, be sure to set up safe passages for drainage pipes. The basic bottom plan of the non-deep foundation pit should be slightly higher than the surrounding road surface, the upper plan should be slightly higher in the middle, and the inclination should be 1/200, which is convenient for drainage pipes, and excellent drainage pipe equipment should be built on both sides.

2.2.4.2 Foundation engineering construction a. Foundation pit excavation The foundation pit excavation shall be carried out according to the basic engineering drawings. Under normal circumstances, the basic bottom end should be excavated to the original soil layer. In case of special circumstances such as frozen soil, the basic pit shall be excavated through the frozen soil. Below 300mm. b. The foundation is basically compacted with 3:7 Panax notoginseng ash soil and the following plain soils of Panax notoginseng ash soil. After compaction, drill exploration is carried out. If this requirement is not met, structural reinforcement solutions must be carried out in addition. c. Grounding grid laying and construction of the special-purpose grounding grid for weighing equipment. Check the installation drawing.“Special grounding grid for weighing equipment”The engineering drawings of the special grounding grid for weighing equipment shall be welded with angle iron or galvanized flat steel during the construction of the special grounding grid for weighing equipment. The nodes are firmly bound with 16-gauge thin iron wire, and the resistance of the grounding wire of the grounding grid is less than 4Ω.

If the terminal is on the scale body, the grounding device of the grounding grid should be laid within one meter of the G4 conduit; if the terminal is in the operating room, the grounding device of the grounding device on the grid should be introduced into the operating room, d. The basic construction enterprise shall carry out the construction staking, wiring and binding according to the specifications and regulations of the building steel bar in the basic engineering drawings. φ is grade I building steel bar, φ is grade II building steel bar, a building steel bar head not less than ￠10 is drawn out from the base on one side of each basic slab, about 500mm long, and one end of the building steel bar is connected to the basic inner building steel bar. Solid electric welding, the other end is welded on the basic board according to the engineering drawings after the installation of the basic board, so that each basic board and the basic inner steel bar are overlapped and integrated. e. The first step of laying the basic board: First, fix each anchor screw on the basic board with 2 nuts (see Figure 2-7). The head of the anchor screw should be exposed 30mm above the basic board.

Step 2: Install the basic board in time according to the specifications in the basic engineering drawings, and the relative deviations of the specifications (vertical, horizontal, straight) of each basic board management center are within±within 5 mm. Step 3: All the anchor screws are welded firmly with the basic internal building steel bars. f. The impact seat is laid. All the impact seats are accurately positioned according to the specifications on the basic drawing and welded firmly with the basic internal building steel bars. Each impact seat should basically be able to bear the Not less than 50000N level impact. g. Conduit laying The customer can lay the conduit according to the specific address of the terminal and the main control room, see the basic data chart (2).

Refer to the basic diagram for the wiring terminal in the operating room, and lay a conduit (G1, G2, G3, G4, G5) on the opposite parts of each basic board.……). ●When the terminal is operated outdoors, refer to the basic drawing, and only lay the G4 conduit. The conduit is made of φ40 hot-dip galvanized steel pipe of moderate length, and bending should be avoided as much as possible, and a 90-degree beveled pipe is not allowed.

A thin iron wire should be inserted into the pipe so that it can be used for communication cables when installing machinery and equipment. After the thin iron wire is passed through, the branch pipe should be closed to avoid falling into the dirt and other blocking the conduit. h. Concrete irrigation can be carried out after the installation of the basic slab and the impact seat is completed in time after the reinforcement of the building has been installed for one irrigation. When grouting, 250x250x100 hydraulic jack installation holes should be left in the opposite parts of the periphery of each basic plate.

During the first irrigation, 50 mm of indoor space should be left under each basic board for secondary irrigation to ensure that the plan of each basic board is on the same level surface. When irrigating once, 200mm of indoor space is basically left on both sides, which is convenient for secondary irrigation on both sides of the edge protection, and ensures that the top plan of the two sides is basically the same height as the top plan of the scale body. i. Secondary Irrigation ●Basic board Secondary Irrigation The bottom of the basic board is vacated 50mm of indoor space to carry out secondary irrigation to ensure that the plan of each basic board is on the same level surface.

Adjust the anchor screws and nuts directly under each basic board, and use a spirit level to check whether the design elevation of each basic board is consistent, so that the height-width ratio error of each basic board does not exceed 3 mm. Use a spirit level to check whether the plan of each basic board is level, ensure that the flatness of the individual basic board is within 1/500, and tighten the nuts on the top of the basic board. Thoroughly enrich the bottom end of the basic board with fine stone cement mortar without leaving any gaps.

Use the template picture to make the structure according to the drawing size, irrigate the concrete so that the upper surface of the basic board service platform is flush with the basic board surface. The basic boards of each part should be able to bear a certain bearing capacity (varies due to the different models and specifications of the multihead weigher), and there should be no cracks or downward movement in the application. ●Secondary irrigation of edge protection The basic edge protection on both sides should be poured after the scale body is installed, and the edge protection steel and pressure bars are welded firmly with the reinforcement diagram in the basic to ensure the gap between the edge protection and the scale body and the aspect ratio. Irrigation with concrete to the design level specification of the basic engineering drawings.

j. Basic maintenance After the construction of the basic project is completed, be sure to pay attention to maintenance. In order to reduce the construction cycle time and maintenance time of the project, it is allowed to add in the concrete during the construction of the project.“early strength agent”. The scale body cannot be installed when the concrete does not meet the required compressive strength.

2.2.4.3 Basic engineering acceptance of new projects The basic engineering acceptance of new projects includes the following categories: a. Use a meter ruler to check whether the length of the pit mouth conforms to the engineering drawings; b. Use a meter ruler to check whether the overall width of the pit mouth conforms to the engineering drawings; c. Check the consistency of the straight line specifications of the pit; d. Use a meter ruler to check whether the specifications of the basic board meet the requirements of the engineering drawings; e. Use a level or a fully transparent water pipe to check the flatness of each basic board; f. Use a level or tap water Check the height-to-width ratio difference between the basic boards; g. The secondary grouting should ensure that the basic board is rich and free of air pockets; h. Are other specifications consistent with the engineering drawings; i. Is there a standard for drainage pipes? ;j. Whether there is an electronic-specific grounding grid and the standard value of the grounding wire resistance; k. Whether there is a wire tube basically to the main control room; l. Whether there is a switching power supply in the control room, and whether the instrument panel switching power supply is a grounding device Wait.

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