An underground continuous wall waterproof structure

Abstract

This application relates to the technical field of building construction, and in particular to a waterproof structure for diaphragm walls. It includes a wall body consisting of multiple diaphragm walls pre-cast on the sidewalls of a foundation pit, and a sealing assembly for sealing the joints between adjacent wall sections. The sealing assembly includes a connector disposed between the two adjacent wall sections. The connector includes a web plate disposed between the end faces of the two adjacent wall sections and a pair of symmetrically arranged flanges on both sides of the web plate. The web plate is perpendicular to the flanges, and the flanges are located on both sides of the joint between the two adjacent wall sections and are abutted against the sides of the wall. The web plate and the flanges form a pair of mounting grooves for installing the wall ends. Precast reinforcing bars are provided on the end faces of the two adjacent wall sections facing the web plate. The web plate is welded to the reinforcing bars, and mortar for connection with the wall can be poured into the mounting grooves. This application improves the sealing effect at the joints of diaphragm walls and prevents leakage problems.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and in particular to a waterproof structure for underground continuous walls. Background Technology

[0002] Currently, with the acceleration of urbanization, urban areas are rapidly increasing and urban populations are experiencing explosive growth. To alleviate urban land traffic congestion and save land, major cities have begun to construct subway projects. During the construction of subway stations, a foundation pit is usually excavated first. Since subway stations are relatively deep, the foundation pit is also deeper. The main station structure is then built inside the foundation pit. However, the deeper the foundation pit is, the easier it is for groundwater to seep into it, leading to water accumulation, which affects construction and may even cause the foundation pit to collapse, posing a safety threat to construction workers.

[0003] Currently, diaphragm walls are constructed on the sidewalls of the foundation pit, primarily for waterproofing and reducing groundwater infiltration, while also providing support for the pit's sidewalls. Diaphragm walls are typically constructed using a segmented trenching and casting process, inevitably creating joints between each construction segment. These construction joints provide pathways for groundwater leakage in water-rich strata. This is especially true in coastal areas where there are often thick layers of water-rich sand, demanding even higher standards for foundation pit waterproofing. Under high water pressure in water-rich areas, the presence of construction joints in the retaining structure makes subway station foundation pits highly susceptible to leakage.

[0004] Although diaphragm walls have good waterproofing effects, in geological conditions with abundant water-rich sand layers, the construction joints of diaphragm walls are the most vulnerable areas for groundwater seepage. Leakage in the foundation pit may also lead to the loss of soil around the construction joints, which then flows into the foundation pit, causing a series of problems such as ground settlement. Summary of the Invention

[0005] In order to improve the sealing effect of the joints of the diaphragm wall and prevent leakage, this application provides a waterproof structure for the diaphragm wall.

[0006] This application provides a waterproof structure for underground continuous wall, which adopts the following technical solution:

[0007] A waterproof structure for a continuous underground wall includes a wall body consisting of multiple continuous walls pre-cast on the sidewall of a foundation pit, and a sealing assembly for sealing the connection between two adjacent walls. The sealing assembly includes a connector disposed between the two adjacent walls. The connector includes a web plate disposed between the end faces of the two adjacent walls and a pair of symmetrically disposed on both sides of the web plate. The web plate is perpendicular to the two wing plates, which are located on both sides of the connection between the two adjacent walls and are attached to the sides of the wall. The web plate and the two wing plates form a pair of mounting grooves for the wall ends to be installed. Precast reinforcing bars are provided on the end faces of the two adjacent walls facing the web plate. The web plate is welded and fixed to the reinforcing bars, and mortar for connection with the wall can be poured into the mounting grooves.

[0008] By adopting the above technical solution, when casting the underground continuous wall, an H-shaped web and two wing plates are pre-set at the joint between two adjacent walls, so that the steel cage of the wall is welded and fixed to the web plate. After the wall is cast, the two wing plates can fit against the inner and outer surfaces of the wall, preventing groundwater around the foundation pit from flowing into the foundation pit from the gap between the two adjacent walls.

[0009] Optionally, the connector may further include a grout-stopping sheet fixed to both sides of each wing plate, the grout-stopping sheet extending along the length of the wall.

[0010] By adopting the above technical solution, the grout-stopping iron sheet installed during concrete mortar pouring can prevent the concrete mortar from flowing around, thereby avoiding the generation of air bubbles or gaps inside the poured mortar.

[0011] Optionally, the connector may also include high-pressure jet grouting piles disposed on the outer wing plate of the foundation pit and located outside the wing plate. Multiple high-pressure jet grouting piles are disposed and stacked crosswise on the outside of the wing plate.

[0012] By adopting the above technical solution, after the construction of the underground continuous wall is completed, multiple high-pressure jet grouting piles are set on the outside of the wing plate. The high-pressure jet grouting piles are made of concrete and can be used to stop water from entering the gap between adjacent walls, thus playing a preliminary waterproofing role and preventing groundwater around the foundation pit from flowing into the foundation pit.

[0013] Optionally, the sealing assembly includes a waterproof component disposed between the ends of two adjacent walls. The waterproof component includes a pair of parallel first waterproof plates. A pair of second waterproof plates are hinged symmetrically disposed on both sides of the two first waterproof plates. The two second waterproof plates on the same side of the two first waterproof plates and on the side away from the first waterproof plates are hinged to each other. A waterproof groove is provided on the end face of the two adjacent walls. The ends of the two second waterproof plates on the same side of the two first waterproof plates are inserted and braced in the waterproof groove.

[0014] By adopting the above technical solution, after the construction of two adjacent walls is completed, a water-blocking structure is set between the two adjacent walls by setting a mechanical structure for sealing and waterproofing. This prevents groundwater around the foundation pit from flowing into the pit through the gap between the two adjacent walls. When blocking water, the distance between the two first waterproof boards is adjusted so that the same end of the two second waterproof boards that are hinged to each other is tightly inserted into the waterproof groove.

[0015] Optionally, the two first waterproof plates are provided with a driving component for driving the two first waterproof plates to move. The driving component includes a screw that passes through the two first waterproof plates. The screw has positive and negative threads, and the positive and negative threads on the screw are threadedly connected to the two first waterproof plates.

[0016] By adopting the above technical solution, when adjusting the distance between the two first waterproof plates, rotating the screw allows the two first waterproof plates to move closer or further apart due to the action of the positive and negative threads on the screw. After the distance between the two first waterproof plates is adjusted by rotating the screw, the same side of the first waterproof plates can be inserted into the waterproof groove. Furthermore, through the threaded connection between the screw and the two first waterproof plates, the position between the two first waterproof plates can be fixed, ensuring that the hinged ends of the two second waterproof plates will not come out of the waterproof groove, thus achieving a long-term effective seal.

[0017] Optionally, a waterproof pad is provided in the waterproof groove, and the two second waterproof plates press the waterproof pad tightly into the waterproof groove.

[0018] By adopting the above technical solution, when the ends of the two second waterproof plates on the same side of the two first waterproof plates are inserted into the waterproof groove, and by adjusting the distance between the two first waterproof plates, the pressure of the two second waterproof plates on the flexible waterproof pad can be controlled, thereby improving the sealing performance between the two second waterproof plates and the waterproof groove.

[0019] Optionally, the sealing assembly further includes a sealing element disposed at the connection between two adjacent walls. The sealing element includes a pair of sealing plates, which are symmetrically disposed on the inner and outer sides of the wall. The screw passes through the two sealing plates and is threaded with a pair of clamping bolts, which can press the sealing plates against the wall.

[0020] By adopting the above technical solution, the two sealing plates installed at the joint of two adjacent walls can form a multi-layered sealed and waterproof structure. When groundwater seeps around the foundation pit, the sealing plates on the outside of the two walls can provide protection first, preventing groundwater from seeping into the joint between the two adjacent walls. The two sealing plates can be fixed at the joint of the two walls by screws and clamping bolts, and a sealed structure can be formed between the two walls and the two sealing plates.

[0021] Optionally, sealing strips are symmetrically fixed on both sides of the sealing plate, and sealing grooves are opened on two adjacent walls, with the sealing strips inserted into the sealing grooves.

[0022] By adopting the above technical solution, a tight seal can be formed between the sealing plate and the wall surface through the sealing strip, preventing groundwater from entering the joint between the two walls through the gaps between the sealing plate and the wall.

[0023] Optionally, a sealing gasket is provided in the sealing groove, and the sealing strip presses the sealing gasket into the sealing groove.

[0024] By adopting the above technical solution, when installing the two sealing plates, the sealing plates can be pressed against the wall surface by rotating the clamping bolts, and then the sealing gasket in the sealing groove can be pressed by the sealing strip to increase the sealing effect between the sealing strip and the sealing groove.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. This application employs a mechanical structure for sealing the joint between two adjacent walls. Compared to concrete connections, the mechanical structure provides a more robust connection between the two walls. The mechanical structure seal creates a multi-layered seal between the two walls. The sealing plate near the pit sidewall forms the first layer of seal at the joint, providing initial sealing. The concrete mortar filling the gap between the wall ends forms the second layer. The waterproofing element between the wall ends forms the third layer. The sealing plate near the pit interior forms the final layer. This multi-layered seal enhances the sealing effect at the wall joint. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0028] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0029] Figure 3 This is a schematic diagram illustrating the sealing assembly in Embodiment 2 of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Wall; 2. Sealing assembly; 21. Connector; 211. Web plate; 212. Wing plate; 213. Grout-stopping sheet plate; 214. High-pressure jet grouting pile; 22. Waterproof component; 221. First waterproof membrane; 222. Second waterproof membrane; 223. Waterproof groove; 224. Waterproof gasket; 23. Driving component; 231. Screw; 232. Rotating part; 24. Sealing component; 241. Sealing plate; 242. Tightening bolt; 243. Sealing strip; 244. Sealing groove; 245. Sealing gasket; 246. Rebar end. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] Reference Figure 1 This application discloses a waterproof structure for underground continuous wall. During the excavation of the foundation pit, a continuous wall formed by concrete pouring is set up around the foundation pit in advance. In the past, the continuous wall was poured in sections during the pouring process. After each section was poured and solidified, the subsequent continuous wall was poured. Therefore, multiple continuous wall sections 1 were formed on the side walls around the foundation pit.

[0033] Example 1

[0034] Reference Figure 1 A waterproof structure for a continuous underground wall includes a sealing component 2 disposed at the connection between two adjacent wall sections 1. The sealing component 2 is used to seal the gap at the connection between the two adjacent wall sections 1 to prevent groundwater from flowing into the foundation pit through the gap. The sealing component 2 includes a connector 21 disposed between the end faces of the two adjacent wall sections 1 for sealing the connection between the two wall sections 1. The connector 21 includes a web 211 vertically disposed between the end faces of the two wall sections 1. The height direction of the web 211 is the same as the height direction of the wall section 1, and the width direction of the web 211 is along the thickness direction of the wall section 1 and is the same as the thickness of the wall section 1. A pair of wing plates 212 are symmetrically disposed on both sides of the web 211, and the web 211 is perpendicular to the two wing plates 212. Furthermore, the height direction of the two wing plates 212 is the same as that of the web plate 211. The two wing plates 212 are located on the inner and outer sides of the connection between two adjacent walls 1, and the inner surface of the two wing plates 212 facing the wall 1 can fit against the surface of the wall 1. The web plate 211 and the two wing plates 212 form an I-shaped structure and form a pair of mounting grooves. When connecting two adjacent walls 1, the end face of the wall 1 can be set in the mounting groove. Precast steel bars are provided on the opposite end faces of the two adjacent walls 1. After the web plate 211 and the two wing plates 212 are installed in the gap between the two walls 1, the precast steel bars on the wall 1 can be welded and fixed to the web plate 211 or the two wing plates 212, increasing the connection strength between the wall 1 and the connector 21.

[0035] Inside the installation groove, after the reinforcing bars on the wall 1 are welded to the web 211, mortar for connection and fixation is poured into the gap between the end face of the wall 1 and the web 211 to connect and fix the wall 1 and the web 211. The connector 21 also includes a grout-stopping sheet plate 213 set on both sides of each wing plate 212. The height direction of the grout-stopping sheet plate 213 is the same as the height direction of the wing plate 212. One side of the grout-stopping sheet plate 213 is fixed to one side of the wing plate 212, and the other side of the grout-stopping sheet plate 213 is along... The wall 1 extends along its length away from the flange 212. The installed grout-stopping sheet prevents concrete from flowing around the grout during pouring and prevents gaps from forming inside the concrete mortar. The connecting assembly also includes high-pressure jet grouting piles 214 installed at the connection between the two walls 1. The high-pressure jet grouting piles 214 are located on the flange 212 on the side of the flange 212 closest to the pit sidewall. Multiple high-pressure jet grouting piles 214 are installed on the outer flange 212. In this embodiment, the high-pressure jet grouting piles 214 are... Three high-pressure jet grouting piles 214 are arranged in a crisscross pattern on the outer wing plate 212. The high-pressure jet grouting waterstop can create three intersecting high-pressure jet grouting piles 214 at the joint of the diaphragm wall, thereby further improving the sealing performance at the joint. In places where concrete needs to be poured, this application requires the use of different types of concrete mortar and the improvement of the mud parameters of the concrete mortar. All concrete with high water resistance and high setting properties are used. By improving the parameters of the concrete mortar, the mud inclusion phenomenon caused by hole collapse is further reduced. Because the mortar itself has a setting property, after a long time, the mortar itself will have large hard lumps that solidify together, which will affect the overall structure of the diaphragm wall. Therefore, frequent mortar replacement can reduce the presence of hard lumps in the mortar. When constructing in a water-rich stratum environment, during the excavation of the pit sidewall, the trench wall of the pit should be reinforced in a timely manner. This can be done by spraying concrete mortar or by using anchor bolts to increase the reinforcement depth of the trench wall and avoid collapse.

[0036] The implementation principle of Example 1 is as follows: When constructing the underground continuous wall, when the workers are tying the reinforcing bars, they can pre-install the web plate 211 and the wing plate 212 at the splice between adjacent walls 1, and weld the reserved reinforcing bar ends 246 at the end of the wall 1 to the web plate 211 for fixation. After the prefabricated reinforcing cage and connector 21 are set up, the grout-stopping iron sheet 213 is welded on both sides of the wing plate 212, and then the concrete of the wall 1 is poured. After the concrete of the wall 1 is poured, a high-pressure jet grouting column for water stop is poured on the outside of the wing plate 212 near the side wall of the foundation pit.

[0037] Example 2

[0038] Reference Figure 2 and Figure 3The difference between this embodiment and Embodiment 1 is that the sealing assembly 2 includes a waterproof component 22 disposed between the end faces of two adjacent walls 1 for sealing the connection between the two walls 1. The waterproof component 22 includes a pair of first waterproof plates 221 disposed between the end faces of two adjacent walls 1. The two first waterproof plates 221 are arranged in parallel, and the height direction of the two first waterproof plates 221 is the same as the height direction of the wall 1. The width direction of the two first waterproof plates 221 is along the length direction of the wall 1. A pair of second waterproof plates 222 are symmetrically hinged on both sides of the two first waterproof plates 221. The length direction of the second waterproof plates 222 is the same as the length direction of the first waterproof plates 221. The two second waterproof plates 222 are on the same side of the two first waterproof plates 221 and are away from the two first waterproof plates 221. The first waterproofing membrane 221 is hinged on one side, so the two second waterproofing membranes 222 on the same side of the two first waterproofing membranes 221 form a hinged triangular structure. Since the first waterproofing membrane 221 and the second waterproofing membrane 222 are hinged, the angle between the two second waterproofing membranes 222 on the same side of the two first waterproofing membranes 221 can be changed by changing the distance between the two first waterproofing membranes 221. Vertical waterproofing grooves 223 are provided on the opposite end faces of the two adjacent walls 1. The hinged ends of the two second waterproofing membranes 222 on the same side of the two first waterproofing membranes 221 can be inserted into the waterproofing grooves 223. By inserting the ends of the two second waterproofing membranes 222 on both sides of the two first waterproofing membranes 221 into the waterproofing grooves 223, a sealed waterproof structure is formed to prevent groundwater outside the foundation pit from flowing into the foundation pit.

[0039] Furthermore, a flexible waterproof pad 224 is fixed inside the waterproof groove 223. The waterproof pad 224 is fixedly fitted in the waterproof groove 223. The ends of the two second waterproof plates 222 are inserted into the waterproof groove 223, which can compress the waterproof pad 224, thereby improving the sealing of the waterproof component 22 between the two sides of the waterproof component 22 and the two adjacent walls 1. A flexible waterproof membrane is bonded and fixed at the hinge position of the first waterproof plate 221 and the second waterproof plate 222. When the first waterproof plate 221 and the second waterproof plate 222 rotate, the flexible waterproof membrane can be stretched and deformed, but will not break. At the same time, the waterproof membrane can prevent water from seeping into the pit from the connection position of the first waterproof plate 221 and the second waterproof plate 222.

[0040] Reference Figure 2 and Figure 3A driving component 23 is provided on each of the two first waterproof plates 221. The driving component 23 can drive the two first waterproof plates 221 to move closer or further apart. The driving component 23 includes a screw 231 passing through the two first waterproof plates 221. The length direction of the screw 231 is the same as the thickness direction of the wall 1. The screw 231 is provided with positive and negative threads, which are threaded to the two first waterproof plates 221. By rotating the screw 231, the two first waterproof plates 221 can move closer or further apart. Rotating parts 232 are fixed at both ends of the screw 231. When it is necessary to adjust the waterproof component 221 on the adjacent walls... When sealing between the two bodies 1, workers can rotate the screw 231 from outside or inside the foundation pit according to the conditions of the construction site, making it more convenient for workers to rotate the screw 231; multiple sets of driving components 23 are provided on the first waterproof plate 221, and the multiple sets of driving components 23 are evenly distributed along the height direction of the first waterproof plate 221. When adjusting the distance between the two first waterproof plates 221, the screws 231 on multiple driving components 23 can be adjusted at the same time, or each screw 231 can be rotated in sequence according to the corresponding order, and the rotation angle of each screw 231 can be controlled so that the distance between the two first waterproof plates 221 can be adjusted to a suitable distance.

[0041] Reference Figure 2 and Figure 3 The sealing assembly 2 also includes a sealing element 24 disposed at the connection between two adjacent walls 1. The sealing element 24 includes a pair of sealing plates 241. The two sealing plates 241 are symmetrically disposed on the inner and outer sides of the connection between the two adjacent walls 1, and the two sealing plates 241 can fit against the inner or outer surface of the wall 1. The length direction of the sealing plate 241 is the same as the height direction of the wall 1. The two ends of the screw 231 can pass outward through the sealing plate 241. A pair of clamping bolts 242 are threaded on the positive and negative threads of the screw 231, and the two clamping bolts 242 are located on the outer side between the two sealing plates 241. The two clamping bolts 242 can be clamped onto the sealing plate 241. After the waterproof component 22 between the two walls 1 is installed, the workers then install the two sealing plates 241. After the sealing plates 241 are installed, the clamping bolts 242 are threaded on the screw 231 and clamped onto the sealing plates 241, so that the two sealing plates 241 can be firmly fixed on both sides of the wall 1.

[0042] Furthermore, sealing strips 243 are symmetrically fixed on the surface of the sealing plate 241 facing the two walls 1 and near both sides of the sealing plate 241. The length direction of the sealing strips 243 is the same as that of the sealing plate 241. Corresponding sealing grooves 244 are provided on the outer and inner surfaces of the two adjacent walls 1. The sealing strips 243 can be inserted into the sealing grooves 244. The sealing plate 241 set on the outer wall of the foundation pit can play a preliminary waterproofing role on the outer surface of the two walls 1, preventing groundwater around the foundation pit from seeping into the foundation pit. A flexible sealing gasket 245 is fixed inside the sealing groove 244. When the sealing strip 243 is inserted into the sealing groove 244, the sealing strip 243 can squeeze the flexible sealing gasket 245. Under the action of the clamping bolt 242 clamping the sealing plate 241, the sealing strip 243 can be pressed onto the sealing gasket 245, improving the sealing effect.

[0043] Reference Figure 2 and Figure 3 Reserved steel bar ends 246 are provided on the end faces of two adjacent walls 1. After the waterproof component 22 is installed, the steel bar ends 246 on the two adjacent walls 1 are welded together. The reserved steel bar ends 246 can also be welded and fixed to the second waterproof plate 222 to increase the connection strength between the two adjacent walls 1. After the sealing component 24 between the two adjacent walls 1 is installed, concrete mortar can be poured into the gap between the two sealing plates 241 and the end faces of the two walls 1 to fill and seal it, thereby improving the sealing effect between the two adjacent walls 1. In addition, the poured concrete mortar can fill the interior of the waterproof component 22 with concrete. After solidification, it can support the waterproof component 22 and prevent the distance between the two first waterproof plates 221 from decreasing after the screw 231 fails.

[0044] The implementation principle of Example 2 is as follows: When constructing the underground continuous wall around the foundation pit, multiple wall sections 1 are first poured and formed. A post-pouring strip space for sealing is set between two adjacent wall sections 1. Waterproof components 22 are first installed between two adjacent wall sections 1. Then, the steel bar ends 246 between two adjacent wall sections 1 are welded and fixed, and connected and fixed with the waterproof components 22. Next, sealing components 24 are set on the inner and outer sides of the two wall sections 1. Two sealing plates 241 are attached to the inner and outer sides of the joint of the two wall sections 1. Finally, concrete mortar is poured between two adjacent wall sections 1 to connect the two adjacent wall sections 1 into a sealed whole.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waterproof structure for underground continuous walls, comprising a wall body (1) of multiple continuous walls pre-cast on the sidewall of a foundation pit, characterized in that: It also includes a sealing assembly (2) for sealing the joint between two adjacent wall sections (1); The sealing assembly (2) includes a waterproof component (22) disposed between the ends of two adjacent walls (1). The waterproof component (22) includes a pair of parallel first waterproof plates (221). A pair of second waterproof plates (222) are hinged and symmetrically disposed on both sides of the two first waterproof plates (221). The two second waterproof plates (222) on the same side of the two first waterproof plates (221) and on the side away from the first waterproof plates (221) are hinged to each other. A waterproof groove (223) is provided on the end face of the two adjacent walls (1). The ends of the two second waterproof plates (222) on the same side of the two first waterproof plates (221) are inserted and braced in the waterproof groove (223). The two first waterproof plates (221) are provided with a driving member (23) for driving the two first waterproof plates (221) to move. The driving member (23) includes a screw (231) that passes through the two first waterproof plates (221). The screw (231) is provided with positive and negative threads, and the positive and negative threads on the screw (231) are threadedly connected to the two first waterproof plates (221). A waterproof pad (224) is provided in the waterproof groove (223), and the two second waterproof plates (222) press the waterproof pad (224) into the waterproof groove (223); The sealing assembly (2) further includes a sealing element (24) disposed at the connection between two adjacent walls (1). The sealing element (24) includes a pair of sealing plates (241), which are symmetrically disposed on the inner and outer sides of the wall (1). The screw (231) passes through the two sealing plates (241) and is threaded with a pair of clamping bolts (242). The two clamping bolts (242) can press the sealing plate (241) onto the wall (1). The sealing plate (241) is symmetrically fixed with sealing strips (243) on both sides. The adjacent two walls (1) are provided with sealing grooves (244). The sealing strips (243) are inserted into the sealing grooves (244). A sealing gasket (245) is disposed in the sealing groove (244). The sealing strips (243) press the sealing gasket (245) into the sealing groove (244).

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