Anti-seepage structure of advance diagonal bracing support and bottom plate joint in foundation pit

Abstract

The utility model discloses an anti-seepage structure of an advanced inclined strut support and a bottom plate node in a foundation pit, the advanced inclined strut support is a prefabricated square pile with a reinforced concrete structure, and first water stop steel plates are respectively embedded in four directions of the section of the advanced inclined strut support intersected with a bottom plate; a second water stop steel plate is horizontally pre-buried on the bottom plate at the intersection of the bottom plate and the advanced inclined strut, and the first water stop steel plates in the four directions are annularly and vertically welded on the second water stop steel plate. According to the utility model, the leakage risk at the joint of the advance diagonal bracing support and the bottom plate is reduced, and the anti-leakage effect at the joint of the advance diagonal bracing support and the bottom plate is improved.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a seepage prevention structure for advanced inclined bracing support and bottom plate joint in foundation pit. Background Technology

[0002] In underground construction, it is usually necessary to install pre-stressed diagonal bracing between the foundation pit retaining structure and the bottom of the pit to protect the stability of the retaining structure and ensure the safety of the pit before proceeding with the underground construction. This results in a construction process of first installing pre-stressed diagonal bracing and then laying the foundation slab. Therefore, the common method for preventing leakage at the joint between the pre-stressed diagonal bracing and the foundation slab is to install a water-stop steel plate at the foundation slab. However, this method has a drawback: after the underground construction is completed, when cutting the pre-stressed diagonal bracing above the foundation slab, the cutting stress can cause the water-stop steel plate to detach or crack at the foundation slab, leading to a risk of leakage at the joint between the pre-stressed diagonal bracing and the foundation slab, thus affecting the building's usability. Utility Model Content

[0003] The purpose of this invention is to provide a seepage-proof structure for the advanced inclined bracing support and bottom plate joint in the foundation pit, so as to solve the problem of leakage risk in traditional waterproofing measures.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a seepage prevention structure for the joint between the advanced inclined bracing support and the bottom slab in the foundation pit, wherein the advanced inclined bracing support is a precast square pile of reinforced concrete structure, and first water-stop steel plates are pre-embedded in four directions at the cross section of the advanced inclined bracing support intersecting with the bottom slab, and second water-stop steel plates are horizontally pre-embedded in the bottom slab at the intersection with the advanced inclined bracing support, and the first water-stop steel plates in the four directions are vertically welded in a ring to the second water-stop steel plates.

[0005] Furthermore, in the anti-seepage structure of the pre-braced support and bottom plate node in the foundation pit provided by this utility model, the weld joint of the first water-stop steel plate and the second water-stop steel plate is covered with an epoxy resin grouting layer.

[0006] Furthermore, in the anti-seepage structure of the pre-braced support and bottom plate node in the foundation pit provided by this utility model, a rubber waterstop is provided on the epoxy resin grouting layer.

[0007] Furthermore, in the anti-seepage structure of the pre-bracing and bottom plate joint in the foundation pit provided by this utility model, the first water-stop steel plate is welded to the reinforcing cage of the pre-bracing.

[0008] Furthermore, in the anti-seepage structure of the pre-braced support and bottom plate node in the foundation pit provided by this utility model, the second water-stop steel plate is welded to the steel cage of the bottom plate.

[0009] Furthermore, the anti-seepage structure of the pre-braced support and bottom plate node in the foundation pit provided by this utility model has a hollow structure with a central hole as the axis of the pre-braced support.

[0010] Furthermore, in the anti-seepage structure of the pre-braced support and bottom plate node in the foundation pit provided by this utility model, the area of ​​the second water-stop steel plate is larger than the area enclosed by the first water-stop steel plates in four directions.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This utility model provides a seepage-proof structure for the joint between the pre-fabricated inclined support and the bottom slab in a foundation pit. The pre-fabricated inclined support utilizes precast square piles of reinforced concrete. At the intersection of the precast square piles and the bottom slab, a lidless square box shape is formed by circumferentially welding a first water-stop steel plate embedded in the four cross-sections of the precast square piles and a second water-stop steel plate embedded in the bottom slab. This improves the connection strength between the pre-fabricated inclined support and the bottom slab. During subsequent construction, when cutting the pre-fabricated inclined support, the circumferential welding within the bottom slab further enhances its structural integrity. The first water-stop steel plates in four directions of the second water-stop steel plate resist the shear force during cutting, reducing the pulling force of the shear force of the advanced diagonal bracing on the second water-stop steel plate in the base plate. That is, the reaction force of the four first water-stop steel plates welded to the second water-stop steel plate resists the shear force of cutting, thereby reducing the problem of the water-stop steel plate of the base plate detaching and the concrete cracking at the base plate, reducing the risk of leakage at the joint between the advanced diagonal bracing and the base plate, and improving the anti-leakage effect at the joint between the advanced diagonal bracing and the base plate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the elevation structure of the anti-seepage structure of the advanced inclined bracing support and bottom slab joint in the foundation pit.

[0014] Figure 2 This is a schematic diagram of the cross-section of the first water-stop steel plate embedded in the precast square pile;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the first and second water-stop steel plates welded together in an circumferential manner for the advanced diagonal bracing support.

[0016] Figure 4 This is a structural schematic diagram of the welded joint between the first and second water-stop steel plates from another perspective.

[0017] As shown in the figure:

[0018] 100. First water-stop steel plate;

[0019] 200. Second waterstop steel plate;

[0020] 300. Epoxy resin grouting layer;

[0021] 400. Rubber waterstop;

[0022] 500. Advanced inclined bracing support; 501. Pile steel frame cage; 502. Central hole;

[0023] 600, base plate;

[0024] 700. Enclosure structure. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] Please refer to Figures 1 to 4 This utility model embodiment provides a seepage-proof structure for the joint between the pre-supported inclined bracing 500 and the bottom slab in an excavation pit. The pre-supported inclined bracing 500 is a precast square pile of reinforced concrete. First water-stop steel plates 100 are pre-embedded in four directions at the cross-section of the pre-supported inclined bracing 500 intersecting with the bottom slab 600. Second water-stop steel plates 200 are horizontally pre-embedded on the bottom slab 600 at the intersection with the pre-supported inclined bracing. The first water-stop steel plates 100 in the four directions are vertically welded in a ring to the second water-stop steel plates 200. The pre-supported inclined bracing 500 is inclined between the retaining structure 700 and the soil below the bottom of the excavation pit, and it penetrates the bottom slab 600 and is inserted into the soil at the bottom of the excavation pit. The precast square pile facilitates the formation of a welded structure perpendicular to the second water-stop steel plate 200, simplifying construction. Therefore, the pre-supported inclined bracing 500 must not use steel pipes, structural steel, or other steel structure bracing commonly used in this field.

[0027] The anti-seepage structure for the joint between the pre-support inclined bracing and the bottom slab in the foundation pit provided in this embodiment of the utility model uses precast square piles of reinforced concrete for the pre-support inclined bracing 500. At the intersection of the precast square piles and the bottom slab 600, a box shape without a lid is formed by circumferentially welding the first water-stop steel plate 100 embedded in the four cross-sections of the precast square piles and the second water-stop steel plate 200 embedded in the bottom slab 600. This improves the connection strength between the pre-support inclined bracing 500 and the bottom slab 600. When the pre-support inclined bracing 500 is cut during subsequent construction, the second water-stop steel plate 200 welded in the bottom slab 600 is used to prevent leakage. The four first water-stop steel plates 100 in the four directions of the steel plate 200 resist the shear force during cutting, reducing the pulling force of the shear force of the advanced diagonal bracing 500 on the second water-stop steel plate 200 in the base plate 600. That is, by welding the four first water-stop steel plates 100 to the second water-stop steel plate 200, the reaction force of the four first water-stop steel plates 100 resists the shear force of cutting, thereby reducing the problem of the water-stop steel plate of the base plate 600 detaching and the concrete cracking at the base plate 600, reducing the leakage risk at the joint between the advanced diagonal bracing 500 and the base plate 600, and improving the anti-leakage effect at the joint between the advanced diagonal bracing 500 and the base plate 600.

[0028] Please refer to Figure 1 To improve the seepage prevention effect at the welded joint, the seepage prevention structure for the pre-braced support and bottom plate joint in the foundation pit provided in this embodiment of the invention includes an epoxy resin grouting layer 300 covering the weld between the first water-stop steel plate 100 and the second water-stop steel plate 200. To further improve the seepage prevention effect at the welded joint, a rubber waterstop 400 can be provided on the epoxy resin grouting layer 300.

[0029] Please refer to Figure 2 In order to improve the reliability of the pre-embedded first water-stop steel plate 100, the anti-seepage structure of the pre-advanced inclined bracing support and bottom plate node in the foundation pit provided by this utility model embodiment is that the first water-stop steel plate 100 is welded to the reinforcing cage 501 of the pre-advanced inclined bracing support 500.

[0030] In order to improve the reliability of the second water-stop steel plate 200 embedded in the base plate 600, the anti-seepage structure of the pre-braced support and base plate node in the foundation pit provided in this embodiment of the utility model is that the second water-stop steel plate 200 is welded to the steel cage of the base plate 600.

[0031] Please refer to Figure 2 and Figure 3 In order to reduce costs, the anti-seepage structure of the pre-bracing support and bottom plate node in the foundation pit provided in this embodiment of the utility model is a hollow structure with a central hole 502.

[0032] Please refer to Figure 3To improve the reliability of welding the first water-stop steel plate 100 onto the second water-stop steel plate 200, the anti-seepage structure of the pre-braced support and bottom plate joint in the foundation pit provided in this embodiment of the invention has an area of ​​the second water-stop steel plate 200 larger than the area enclosed by the first water-stop steel plates 100 in four directions. The first water-stop steel plate 100 is located at the four sides of the second water-stop steel plate 200, and blank spaces are left at the four sides of the second water-stop steel plate 200 to avoid the situation where welding on the edge lines is prone to breakage.

[0033] The anti-seepage structure of the pre-supported inclined bracing and bottom plate joint in the foundation pit provided by this utility model effectively solves the problem of water leakage at the connection between the pre-supported inclined bracing 500 and the bottom plate 600 by pre-embedding four-direction first water-stop steel plates 100 on the pre-supported inclined bracing 500 and circumferentially welding them onto the second water-stop steel plates 200 pre-embedded in the bottom plate 600, thereby improving the construction quality at the joint and ensuring the safety of underground buildings.

[0034] This utility model is not limited to the specific embodiments described above. Obviously, the embodiments described above are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the scope of protection of this utility model. Those skilled in the art can make other levels of modifications and variations to this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model, this utility model also intends to include these modifications and variations.

Claims

1. A seepage-proof structure of a node of a forepoling support and a bottom plate in a foundation pit, characterized in that, The advanced diagonal support is a prefabricated square pile of reinforced concrete structure, first water stopping steel plates are respectively pre-buried in four directions of a section of the advanced diagonal support intersecting with the bottom plate, a second water stopping steel plate is horizontally pre-buried on the bottom plate intersecting with the advanced diagonal support, and the first water stopping steel plates in the four directions are vertically welded in a ring shape on the second water stopping steel plate.

2. The anti-leakage structure of a node of a bracing and strutting system in a foundation pit according to claim 1, characterized in that, An epoxy grouting layer is arranged on the weld joint of the first water stopping steel plate and the second water stopping steel plate.

3. The anti-leakage structure of the excavation inner advance raker support and the bottom plate node according to claim 2, characterized in that, A rubber water stopping belt is arranged on the epoxy grouting layer.

4. The anti-leakage structure of a node of a bracing and strutting system in a foundation pit according to claim 1, characterized in that, The first water stopping steel plate is welded on a steel reinforcement cage of the advanced diagonal support.

5. The anti-leakage structure of a node of a bracing and strutting system in a foundation pit according to claim 1, wherein, The second water stopping steel plate is welded on a steel reinforcement cage of the bottom plate.

6. The anti-leakage structure of a diaphragm wall inner advance raker support and bottom plate joint according to claim 1, characterized in that, The shaft center of the advanced diagonal support is a hollow structure with a central hole.

7. The anti-leakage structure of a diaphragm wall inner advance raker support and bottom plate joint according to claim 1, characterized in that, The area of the second water stopping steel plate is greater than the area enclosed by the first water stopping steel plates in the four directions.

Images