Jianjiantong media ID: jianzhong001 in building electrical installation engineering, we often encounter the design that the strong and weak current cables need to be laid on the ground
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The traditional method is to use directly buried trunking
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The cover plate is easy to deform, the flatness is poor, the waterproof performance is low, and it has a great impact on the overall effect of the later decoration of the ground
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In the national excellent project undertaken by Beijing urban construction Yatai group, a new type of buried ground trunking has been developed
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After laying, it has high flatness, surface flatness is controlled within 2mm, beautiful joints with decorative ground, height difference between adjacent joints is controlled within 1mm, and good waterproof performance, so as to achieve the goal of excellence
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Construction site of new buried ground trunking this project is in the open reading area, building electrical specialty needs to bury different specifications of 100 × 50, 200 × 50, 300 × 50 ground trunking, which is mainly used for laying strong and weak current cables for the lighting and socket on each reading table
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The project department develops a new type of ground raceway
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The new type of waterproof ground raceway is fixed with independent support before the cushion is laid in the civil engineering
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After the height is adjusted, the raceway is put into the support, and then poured into shape
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Schematic diagram of ground trunking the new buried ground trunking adopts openable cover plate, which is conducive to the replacement and maintenance of cables
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The installation height of trunking is controlled by adjusting bracket
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Separate waterproof device is set to effectively avoid accidental water
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Add a layer of protective decorative steel plate to avoid deformation of cover plate under external force
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Advantages: ① openable cover plate is easy to maintain; ② waterproof device is set; ③ adjustable bracket is added to facilitate height adjustment; ④ double cover plate is set to withstand large external force and is not easy to deform
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The control scheme of the new buried ground trunking is as follows: (1) the L-shaped adjustable support is set for the support height and low degree control: ① the L-shaped adjustable support is adjusted and fixed according to the ground elevation line; ② the support is fixed with the bottom plate by bolts; ③ the L-shaped support is fine tuned; ④ the concrete is poured Soil
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Advantages: ① rigid and firm, not easy to deformation; ② adjustable height; ③ easy to fix, not easy to displacement
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（2） 3M long stainless steel strip is set for splicing joint control: ① process 3M long stainless steel strip according to site demand; ② adjust the levelness of stainless steel strip; ③ weld the strip on L-shaped support
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Advantages: ① stainless steel material, smooth surface, corrosion resistance; ② good appearance quality after welding
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（3） Water proof performance treatment is provided with water guide channel: water guide channel is provided on both sides of the line channel itself
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Advantages: ① the water guide trough is fixed on the side of the line trough, which is durable; ② the water guide effect is good
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Construction process example 1 support height and low degree control (1) determine the laying position of the trunking according to the design drawing, measure the center line of the support by using the infrared level meter, and evenly arrange the L-shaped adjustable support according to the requirements of the fixed point of the trunking, and the fixed spacing is generally 500mm in the straight section
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(2) Fix the base of L-shaped adjustable bracket on the ground base with Φ 6 metal expansion bolts, adjust the height of L-shaped bracket according to the decorative ground elevation, tighten the fixing bolts on both sides of L-shaped bracket, and adjust it again with a level to ensure that the height deviation of bracket is not more than 1 mm
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The 3M long stainless steel strip is welded on one side of the L-shaped adjustable support, and then the stainless steel strip on the other side is welded with a level ruler
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The upper opening of the strip should be flush with the finished surface of the interior decoration floor, so as not to affect the flatness of the overall decoration floor
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The weld should be full without slag inclusion, undercut and other defects
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The height deviation of the upper surface of the strip is not more than 1 mm, and the spacing of the strips on both sides is consistent, and the deviation is not more than 1 mm
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(3) waterproof performance treatment (1) the connection of new buried ground trunking shall be uninterrupted, the connection of straight section shall adopt special connecting plate, the two ends of the connecting plate shall be fastened with connecting bolts of special locking nuts or locking washers, the gap at the connection shall be tight and straight, and the end of the trunking shall be plugged
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(2) After the new buried ground trunking and accessories are laid, a systematic inspection shall be conducted for the water guide channel
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(4) check again after pouring
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(1) lay the decorative protective steel plate on the stainless steel strip and pour the cushion
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(2) After the cushion reaches the specified strength, arrange professional personnel to clean and inspect the trunking and support as a whole
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Construction effect inspection and acceptance shall be conducted after the construction of new buried ground trunking
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The surface flatness shall be controlled within 2mm and the height difference of adjacent joints shall be controlled within 1mm by ruler and infrared measurement
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The new buried ground trunking adopts independent bracket and steel plate, which effectively protects the internal water conduit, and the ground decoration material is also convenient for pavement
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