Water-stopping structure for diaphragm wall near subway deep foundation pit

Abstract

The utility model relates to a kind of water stop structure of subway deep foundation pit diaphragm wall in proximity, it includes basement roof, is set in diaphragm wall both sides;Post-cast strip pre-acting part, set on the upper portion of basement roof and a certain distance from diaphragm wall, the inside of this post-cast strip pre-acting part is equipped with water stop steel plate;Water stop steel plate one side is built into the inside of post-cast strip pre-acting part, for preventing leakage.The utility model not only does not need later's excavation, also greatly reduces the risk of leakage by water stop steel plate from weak position shift;Not only improve construction efficiency, reduce construction cost, also effectively improve waterproof performance, reduce the possibility of leakage.

Description

Technical Field

[0001] This utility model relates to the field of deep foundation pit water stopping, specifically a water stopping structure for a diaphragm wall near a subway deep foundation pit. Background Technology

[0002] With the acceleration of urbanization, subways, as an important component of urban public transportation, are becoming increasingly widespread. Subway lines typically traverse city centers, adjacent to numerous buildings and infrastructure. Therefore, when carrying out deep foundation pit projects near subway lines, special attention must be paid to the stability of the subway tunnels to prevent deformation or damage to the subway caused by construction activities.

[0003] In deep foundation pit engineering, to ensure the stability of subway tunnels, construction units typically employ internal support systems and retaining walls (piles) to reinforce the perimeter of the pit. These measures play a crucial role during pit excavation and basement structure construction. However, after the basement structure is completed, these retaining walls must be removed to connect the basement to the above-ground building. Ensuring the waterproofing performance of the removed sections of the basement roof slab during this removal process becomes a critical issue.

[0004] The traditional method involves embedding the waterstop steel plate entirely into the basement roof slab during construction. While this method meets leakage prevention requirements to some extent, it presents several inconveniences in actual construction. First, because the waterstop steel plate is completely encased in concrete, extensive excavation is required to expose it after the diaphragm wall is removed, increasing both construction difficulty and time commitment. Second, the excavation process can easily damage the waterstop steel plate, reducing its leakage prevention performance and increasing the risk of subsequent leaks. Furthermore, the excavation and post-construction of the pouring strip require additional time, extending the overall construction period. Utility Model Content

[0005] The present invention aims to overcome the defects of the prior art and provide a water-stopping structure for the diaphragm wall near a deep foundation pit of a subway, solving the problem of setting water-stopping steel plates on both sides of the diaphragm wall near a deep foundation pit of a subway.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] A water-stopping structure for a diaphragm wall near a deep foundation pit of a subway station, characterized in that it includes...

[0008] The basement roof slab is located on both sides of the diaphragm wall;

[0009] The precast section of the post-cast strip is set at the top of the basement roof slab and at a certain distance from the diaphragm wall. A water-stop steel plate is provided on the inner side of the precast section of the post-cast strip. One side of the water-stop steel plate is built into the inner side of the precast section of the post-cast strip to prevent leakage.

[0010] The water-stopping structure of the diaphragm wall near the deep foundation pit of the subway is characterized in that: the precast part of the post-cast strip is integrally cast with the basement roof slab to form an integral structure, which jointly bears the support and prevents leakage.

[0011] The water-stopping structure for a diaphragm wall near a deep foundation pit of a subway is characterized in that: the upper part of the precast section of the post-cast strip is a main body with a width of 300mm and a height of 200mm, and a sloped section with a bottom angle of 30°, which is used to guide water flow and waterproof.

[0012] The water-stopping structure for a diaphragm wall near a deep foundation pit of a subway is characterized in that: the water-stopping steel plate is fixed to the inner side of the precast section of the post-pouring strip by welding or bolting to ensure that it does not shift during the concrete pouring process.

[0013] The water-stopping structure for a diaphragm wall near a deep foundation pit of a subway is characterized in that: the reinforcing bars of the basement roof slab extend to the front of the diaphragm wall and bend and protrude 500mm from the surface of the basement roof slab in front of the diaphragm wall for subsequent reinforcement splicing after the diaphragm wall is demolished.

[0014] The water-stopping structure for a diaphragm wall near a deep foundation pit of a subway is characterized in that: the precast part of the post-cast strip is integrated with the basement roof slab and the diaphragm wall by concrete pouring to form an integral waterproof structure, and the water-stopping steel plate is wrapped inside the precast part of the post-cast strip.

[0015] The water-stopping structure of the diaphragm wall near the deep foundation pit of the subway is characterized in that: the connection between the basement roof slab and the precast part of the post-pouring strip and the water-stopping steel plate is sealed with sealant or waterproof coating.

[0016] The beneficial effects of this utility model are as follows: As can be seen from the above technical solution, this application provides a water-stopping structure for a diaphragm wall near a deep foundation pit of a subway. By setting a pre-cast section of the post-cast strip on the upper part of the basement roof slab, subsequent excavation work is avoided, greatly reducing construction time and labor intensity. Construction workers can directly perform rebar splicing and secondary pouring without additional excavation and repair work, simplifying the construction process and improving construction efficiency. The slope-finding part of the pre-cast strip helps guide water flow, further enhancing the waterproofing effect. At the same time, the tight fit between the water-stopping steel plate and the diaphragm wall, as well as the fixed connection with the pre-cast section, ensures the reliability of the waterproofing performance. This application avoids the step of excavating concrete, reducing concrete waste and also reducing the additional material costs incurred due to repairing damaged water-stopping steel plates. Due to the simplification of the construction process and the improvement of construction efficiency, the overall construction cycle is shortened, thereby reducing labor costs and equipment rental costs.

[0017] This application is not only applicable to deep foundation pit projects near subways, but can also be extended to other underground projects that require the installation of water-stop steel plates, and has wide applicability. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0021] like Figure 1 As shown: A water-stopping structure for a diaphragm wall near a deep foundation pit of a subway station, which includes...

[0022] The basement roof slab 3 is located on both sides of the diaphragm wall 4;

[0023] The post-cast strip prefabrication section 1 is set on the upper part of the basement roof slab and at a certain distance from the diaphragm wall. A water-stop steel plate 2 is provided on the inner side of the post-cast strip prefabrication section. One side of the water-stop steel plate is built into the inner side of the post-cast strip prefabrication section to prevent leakage.

[0024] The precast section of the post-pouring strip is cast integrally with the basement roof slab to form an integrated structure, which together bears the responsibility of support and preventing leakage.

[0025] The upper part of the post-cast strip prefabrication section is a main body with a width of 300mm and a height of 200mm, and a sloped section with a bottom angle of 30°, which is used to guide water flow and waterproof.

[0026] The water-stop steel plate is fixed to the inside of the precast section of the post-pouring strip by welding or bolting to ensure that it does not shift during the concrete pouring process.

[0027] The reinforcing bars of the basement roof slab extend to the front of the diaphragm wall and bend and protrude 500mm from the surface of the basement roof slab in front of the diaphragm wall for subsequent reinforcement splicing after the diaphragm wall is removed.

[0028] The precast section of the post-cast strip is integrated with the basement roof slab and the diaphragm wall by concrete pouring to form an integral waterproof structure, and the water-stop steel plate is wrapped inside the precast section of the post-cast strip.

[0029] The connection between the basement roof slab, the precast section of the post-cast strip, and the waterstop steel plate shall be sealed with sealant or waterproof coating.

[0030] The construction method steps of this application are as follows:

[0031] Step 1: Pour the floor slabs on both sides of the diaphragm wall position of the basement roof slab up to the partition wall. The steel bars of the floor slab should not extend beyond the diaphragm wall. Instead, bend them 500mm out of the floor slab surface in front of the diaphragm wall and leave them until the diaphragm wall is removed before removing the lapped steel bars.

[0032] Step 2: Set up a precast section of the post-cast strip at the top of the top slab, 500mm away from the partition wall. The precast section of the post-cast strip is 300mm wide and 200mm high, with a 30° slope at the bottom corner. A water-stop steel plate is set on the inside of the precast section of the post-cast strip. The precast section of the post-cast strip is poured together with the top slab on both sides of the diaphragm wall.

[0033] Step 3: After the top slabs on both sides of the diaphragm wall are poured, the diaphragm wall is removed layer by layer from top to bottom; after the first floor diaphragm wall is removed, the bent reserved steel bars in "Step 1" are removed, and the beam and slab steel bars on both sides are connected.

[0034] Step 4: Perform secondary pouring at the lap joint of the basement roof slab reinforcement and the precast section of the upper post-pouring strip.

[0035] By extending the steel reinforcement of the basement roof slab to the front of the diaphragm wall and bending it out by 500mm, the reserved steel reinforcement can be easily lapped after the diaphragm wall is removed, ensuring the integrity and stability of the structure.

[0036] The precast section of the post-cast strip is integrated with the basement roof slab and diaphragm wall through concrete pouring, forming a unified waterproof structure. This unity not only enhances waterproof performance but also improves the structure's stability and load-bearing capacity.

[0037] This application places the water-stop steel plate on the upper part of the top plate, which eliminates the need for subsequent chiseling and greatly reduces the risk of leakage by moving the water-stop steel plate from a weak point.

[0038] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway, characterized in that, It includes The basement roof slab is located on both sides of the diaphragm wall; The precast section of the post-cast strip is set at the top of the basement roof slab and at a certain distance from the diaphragm wall. A water-stop steel plate is provided on the inner side of the precast section of the post-cast strip. One side of the water-stop steel plate is built into the inner side of the precast section of the post-cast strip to prevent leakage.

2. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The precast section of the post-pouring strip is cast integrally with the basement roof slab to form an integrated structure, which together bears the responsibility of support and preventing leakage.

3. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The upper part of the post-cast strip prefabrication section is a main body with a width of 300mm and a height of 200mm, and a sloped section with a bottom angle of 30°, which is used to guide water flow and waterproof.

4. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The water-stop steel plate is fixed to the inside of the precast section of the post-pouring strip by welding or bolting to ensure that it does not shift during the concrete pouring process.

5. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The reinforcing bars of the basement roof slab extend to the front of the diaphragm wall and bend and protrude 500mm from the surface of the basement roof slab in front of the diaphragm wall for subsequent reinforcement splicing after the diaphragm wall is removed.

6. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The precast section of the post-cast strip is integrated with the basement roof slab and the diaphragm wall by concrete pouring to form an integral waterproof structure, and the water-stop steel plate is wrapped inside the precast section of the post-cast strip.

7. The water-stopping structure for a diaphragm wall adjacent to a deep foundation pit of a subway station according to claim 1, characterized in that: The connection between the basement roof slab, the precast section of the post-cast strip, and the waterstop steel plate shall be sealed with sealant or waterproof coating.

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