During the secondary grouting of the foundation plate, the relative error of the center of the foundation plate shall be ± 3mm, the horizontal inclination of the foundation plate shall be less than 1/500, and the diagonal deviation of the center distance of each foundation plate shall be less than 2mm.
(5) Measures must be taken during construction to ensure the correct position of foundation bolts and foundation plates.
Grounding plays the role of electrical protection and anti-interference for the use of the weighbridge.
(the article comes from China Chemical Instrument Network)..
(1) The grounding grid shall be a special grounding grid for the weighbridge and shall not be combined with the lightning protection grounding grid.
(2) When laying vertically, the depth of vertical hitting underground shall not be less than 2m, generally 2.5~3m.
(4) When welding the connection of grounding wire, if lap welding is used, the lap welding length must be 6 times the diameter of round steel, and the welding place should be treated with rust prevention.
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In addition, leave a gap between the protective frame and the scale platform.
(4) More than 50% of the intersection points in the foundation concrete should be bound with 16 # iron wires to form a grounding grid, and connected to each foundation plate with reinforcement (used as the ground wire of the weighing sensor).
During foundation construction, a section of the protective frame shall not be left.
(8) The limit frame shall be installed after the installation of the bearing platform, so as to control the gap between it and the bearing platform.
The grounding electrode and the wiring at the edge of the grounding plate should be copper plated or galvanized, but painting is strictly prohibited.
The nearest distance between the grounding of the lightning protection grounding grid and the grounding electrode of the weighbridge grounding grid shall not be less than 5m, and it shall be more than 5m in saline alkali land.
Therefore, in the construction of the approach road, its height should be consistent with that after the weighing platform is installed in place.
2.
The quality of the foundation directly affects the accuracy and stability of the weighbridge, so the construction must be carried out according to the foundation construction drawings to ensure that the construction requirements are met.
In order to shorten the construction period and curing time, measures such as “early strength agent” are allowed to be added to the concrete during construction.
(1) The bearing capacity (ground resistance) of plain soil under the foundation is required to be no less than 98kpa (10t/m2).
If the gap is too small, it may squeeze the scale platform.
The unreasonable approach road also affects the use of the weighbridge.
The protective frame shall be firmly welded with the reinforcement in the foundation.
Similarly, the foundation outside the protective frame shall be treated by secondary grouting.
(3) For shallow foundation pit foundation, drainage channel must be set.
The distance between each contact of the weighing instrument grounding grid shall not be less than 3m.
If the site geological conditions cannot meet this requirement, reinforcement must be done.
Therefore, it is suggested to adopt the method of secondary grouting to locate, and it must be ensured that no cavity is formed between the foundation plate and the concrete.
After the weighing platform is installed in place, the frame shall be welded according to the horizontal height of the weighing platform, and finally secondary grouting shall be carried out.
When the concrete does not reach the design strength, the weighing platform shall not be installed.
This paper outlines all aspects that need to be paid attention to in the foundation civil construction to ensure the accuracy of the weighbridge.
The foundation is an important part of the weighbridge, and the quality of the foundation directly affects the accuracy and stability of the weighbridge.
(9) The construction approach of the approach road is the channel for vehicles to get on and off the scale.
Foundation civil construction foundation is an important part of the weighbridge, which is mainly composed of the following parts: foundation part, platform part, limit part, grounding grid part.
(3) When laying horizontally, the buried depth should not be less than 0.7m.
(7) The protective frame shall be installed after the installation of the bearing platform to ensure the gap and height between the protective frame and the bearing platform.
(2) The foundation excavation must be below the frozen soil line.
If the gap is too large, it is easy to cause impact when the vehicle passes.
The surrounding drainage channel should also be considered for the foundation without foundation pit.
The poor grounding effect will also affect the accuracy of the weighing instrument.
The upper surface of the bottom of the foundation should be slightly higher than the surrounding ground, and the upper plane should be high in the middle, with a slope of 1/200, so as to facilitate drainage and ensure that the weighbridge will not be submerged due to rainstorm.
(6) After the foundation construction is completed, attention must be paid to maintenance.
