Leaking stoppage method and structure for leakage holes of foundation pit support structure in soft soil area
By adopting the three-blocking structure method in the foundation pit enclosure structure in the soft soil area, the problem of complex, time-consuming and poor leakage plugging construction of the foundation pit enclosure structure is solved, and the leakage plugging process is simplified, convenient construction, speed acceleration, cycle shortening and effect improvement are achieved.
Patent Information
- Application Number
- CN202411709164.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-03-21
AI Technical Summary
In the foundation pit enclosure structure in soft soil areas, leakage holes are prone to occur, resulting in safety hazards caused by running water, running soil, and quicksand. The traditional leak plugging method is complex, time-consuming and poor in construction.
The three-blocking structure is used: the first blocking structure is the sealing plate on the inside of the foundation pit, the second blocking structure is to inject fast-drying cement slurry for internal filling, and the third blocking structure is to drill holes and grout outside the pit on the outside of the foundation pit for external filling.
Effectively prevent the loss of soil in the leakage holes, avoid the safety hazards of running water, running soil, and quicksand to the foundation pit, and prevent the risks of collapse and settlement. It also has a simple process, convenient construction, fast speed, short cycle and good effect.
Smart Images
Figure CN119663865A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of foundation pit engineering, and in particular to a method and structure for plugging leakage holes of a foundation pit retaining structure in a soft soil area. Background Art
[0002] For deep and large foundation pits in soft soil areas, during the process of excavation to the base of the foundation pit retaining structure, due to the large pressure difference between the water and soil inside and outside the pit, the foundation pit retaining structure is prone to leakage, causing serious water flow, soil flow, and sand flow, resulting in holes of a certain area in the foundation pit retaining structure. In addition, when the foundation pit retaining structure is constructed through retaining piles, due to large changes in soil layers and improper construction operations, the distance between the local retaining piles is too large, resulting in partial submergence of the soil layer, leakage of the aquifer, or water accumulation and leakage between the piles between the water-stop curtain and the retaining piles, causing the soil between the piles to fall off and form larger holes. The distance between the retaining piles and the water-stop curtain is relatively close. When the hole is large (≥400mm), the retaining piles will not be able to effectively support the water-stop curtain. Since the water-stop curtain is a cement-soil mixing pile, it will break and leak if it is deformed, posing a safety hazard to the foundation pit. If leakage causes a large amount of soil and water loss, it will cause the soil behind the retaining structure to settle too much, and in serious cases, it will cause the soil behind the retaining structure to lose resistance and cause the risk of foundation pit collapse. Therefore, it is necessary to plug the leakage holes in the foundation pit retaining structure. The common plugging method in this field is: drive a drain pipe into the leakage point, and use a steel pipe and double-fast cement to seal the drain pipe. After the sealing material reaches the strength, close the drain pipe valve. This process may be complicated and time-consuming, and the plugging effect is poor. Summary of the invention
[0003] The purpose of the present invention is to provide a method and structure for plugging leakage holes in a foundation pit retaining structure in a soft soil area, so as to solve the problems that the traditional foundation pit retaining structure leakage hole plugging process is complicated in construction, and quick-drying cement slurry is easily washed away by flowing water, flowing soil and quicksand at the leakage holes, resulting in difficulty in plugging, long plugging period and poor plugging effect.
[0004] In order to solve the above technical problems, the present invention provides a method for plugging leakage holes in a foundation pit retaining structure in a soft soil area, comprising:
[0005] Clean the leakage holes in the foundation pit retaining structure;
[0006] Install plugging plates at the leakage holes of the foundation pit retaining structure to construct the first plugging structure for the leakage holes, and seal the leakage holes of the foundation pit retaining structure through the first plugging structure;
[0007] The first sealing structure is used as a template to inject quick-drying cement slurry into the leakage holes of the foundation pit retaining structure to construct the second sealing structure for the leakage holes, and the leakage holes of the foundation pit retaining structure are filled and sealed inside the foundation pit through the second sealing structure;
[0008] Backfill the foundation pit on the side where the leakage hole of the foundation pit retaining structure is located, so that the height of the backfill soil exceeds the leakage hole;
[0009] The third plugging structure is constructed on the outside of the foundation pit retaining structure by drilling and grouting outside the pit to plug the leakage holes, and the leakage holes of the foundation pit retaining structure are filled and plugged externally on the outside of the foundation pit through the third plugging structure;
[0010] Remove the backfill soil in the foundation pit.
[0011] Furthermore, the present invention provides a method for plugging leakage holes in a foundation pit retaining structure in a soft soil area, which drills holes outside the foundation pit retaining structure and uses a double-liquid grouting pipe to perform double-liquid grouting to construct a third plugging structure for the leakage holes.
[0012] Furthermore, the present invention provides a method for plugging leakage holes in a foundation pit retaining structure in a soft soil area, in which holes are drilled outside the foundation pit retaining structure and polyurethane is injected to construct a third plugging structure for the leakage holes.
[0013] Furthermore, in the method for plugging leakage holes in a foundation pit retaining structure in a soft soil area provided by the present invention, the plugging plate is a steel template.
[0014] Furthermore, the present invention provides a method for plugging leakage holes in a foundation pit retaining structure in a soft soil area, wherein the plugging plate is a wooden formwork, and is connected to the foundation pit retaining structure via a steel mesh on the outside of the wooden formwork.
[0015] In order to solve the above-mentioned technical problems, the present invention also provides a leakage plugging structure for leakage holes of a foundation pit retaining structure in a soft soil area, including a first plugging structure, a second plugging structure and a third plugging structure at the leakage holes of the foundation pit retaining structure, the first plugging structure being a plugging plate located on the inner side of the foundation pit and installed at the leakage holes of the foundation pit retaining structure, the second plugging structure being quick-drying cement slurry injected and filled in the closed space formed by the plugging plate and the leakage holes, and the third plugging structure being an outside-pit grouting body located on the outside of the foundation pit retaining structure.
[0016] Furthermore, in the leakage plugging structure for leakage holes of foundation pit retaining structure in soft soil areas provided by the present invention, the plugging plate is a steel template.
[0017] Furthermore, in the leakage plugging structure for leakage holes of the foundation pit retaining structure in soft soil areas provided by the present invention, the steel template is welded to the steel section of the foundation pit retaining structure.
[0018] Furthermore, in the leakage plugging structure for leakage holes in a foundation pit retaining structure in soft soil areas provided by the present invention, the plugging plate is a wooden formwork, and the outer side of the wooden formwork is connected to the foundation pit retaining structure through a steel mesh.
[0019] Furthermore, in the leakage plugging structure for leakage holes of the foundation pit retaining structure in soft soil areas provided by the present invention, the steel mesh is welded to the steel sections of the foundation pit retaining structure.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] The present invention provides a method and structure for plugging leakage holes in a foundation pit retaining structure in a soft soil area. The first plugging structure is used to seal and plug leakage holes in the foundation pit retaining structure to prevent soil from continuing to flow out of the leakage holes, thereby avoiding potential safety hazards to the foundation pit caused by flowing water, flowing soil and flowing sand from the leakage holes into the foundation pit; the second plugging structure is used to perform internal filling and plugging at the leakage holes of the foundation pit retaining structure on the inner side of the foundation pit to prevent excessive pressure of the soil outside the pit from impacting the first plugging structure, thereby causing the first plugging structure to separate from the foundation pit retaining structure and causing the risk of continued expansion of the leakage holes; the third plugging structure is used to perform external filling and plugging at the leakage holes of the foundation pit retaining structure on the outer side of the foundation pit to reinforce the soil outside the foundation pit retaining structure to prevent collapse; the leakage holes of the foundation pit retaining structure are plugged by the three plugging structures, thereby ensuring the safety of the foundation pit retaining structure and reducing the safety risks of foundation pit collapse and settlement. The invention has the advantages of simple plugging process, convenient construction, fast plugging speed, short plugging cycle and good plugging effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a flow chart of the method for plugging leakage holes in the foundation pit retaining structure in soft soil areas;
[0023] Figure 2 It is a schematic diagram of the elevation structure of the leakage hole plugging structure of the foundation pit retaining structure in the soft soil area;
[0024] Figure 3 It is a planar structural diagram of the seepage hole plugging structure of the foundation pit retaining structure in soft soil areas;
[0025] As shown in the figure:
[0026] 100. Leakage plugging structure for the retaining structure of foundation pit in soft soil area, 110. The first plugging structure, 111. Steel mesh, 120. The second plugging structure, 130. The third plugging structure, 140. The retaining structure of foundation pit, 141. Steel section, 142. Water-stop curtain, 143. Leakage holes, 150. Backfill soil, 160. Double-liquid grouting pipe, 170. Excavation surface, 180. Purlin, 190. The first support. DETAILED DESCRIPTION
[0027] The present invention is described in detail below in conjunction with the accompanying drawings: The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0028] Please refer to Figures 1 to 3 The embodiment of the present invention provides a method for plugging leakage holes in a foundation pit retaining structure in a soft soil area, comprising:
[0029] Step 201 , cleaning the leakage holes 143 of the foundation pit retaining structure 140 . The foundation pit retaining structure 140 may be composed of a steel section 141 and a water-stop curtain 142 .
[0030] Step 202, a plugging plate is installed at the leakage hole 143 of the foundation pit retaining structure 140 to construct a first plugging structure 110 for the leakage hole 143, and the leakage hole 143 of the foundation pit retaining structure 140 is sealed and plugged by the first plugging structure 110. In order to resist the fluid pressure at the leakage hole 143, the plugging plate can be a steel template; in order to achieve the purpose of sealing and plugging, the plugging plate can also be a wooden template, and at this time, the outside of the wooden template is connected to the foundation pit retaining structure 140 through a steel mesh 111. The steel mesh 111 can improve the connection strength of the wooden template fixed to the foundation pit retaining structure 140, and improve its resistance.
[0031] Step 203, using the first sealing structure 110 as a template, quick-drying cement slurry is injected into the leakage hole 143 of the foundation pit retaining structure 140 to construct the second sealing structure 120 for the leakage hole 143, and the second sealing structure 120 is used to fill and seal the leakage hole 143 of the foundation pit retaining structure 140 on the inner side of the foundation pit.
[0032] Step 204, backfill soil 150 in the foundation pit on the side where the leakage hole 143 of the foundation pit retaining structure 140 is located, so that the height of the backfill soil 150 exceeds the leakage hole 143. For example, the height of the backfill soil 150 exceeding the leakage hole 143 is 500 mm.
[0033] Step 205, drilling and grouting are performed outside the pit outside the foundation pit retaining structure 140 to construct the third plugging structure 130 for the leakage hole 143, and the leakage hole 143 of the foundation pit retaining structure 140 is externally filled and plugged outside the foundation pit through the third plugging structure 130. The soil outside the pit is reinforced by the third sealing structure 130, especially the soil at the leakage hole 143. In order to quickly carry out engineering rescue construction on the leakage hole 143, drilling outside the pit is performed outside the foundation pit retaining structure 140, and double-liquid grouting is performed through the double-liquid grouting pipe 160 to construct the third plugging structure 130 for the leakage hole 143. The number of double-liquid grouting pipes 160 can be multiple and constructed simultaneously to improve the efficiency of grouting outside the pit. After grouting outside the pit, the double-liquid grouting pipe 160 is pulled out. In order to improve the strength of the soil outside the pit, a third sealing structure 130 may be constructed by drilling holes outside the pit and injecting polyurethane into the leakage holes 143 outside the foundation pit retaining structure 140 .
[0034] Step 206, remove the backfill soil 150 in the foundation pit, so that the foundation pit excavation construction can continue.
[0035] Please refer to Figures 2 to 3 Based on the above method, an embodiment of the present invention provides a leakage plugging structure 100 for leakage holes in a foundation pit retaining structure in a soft soil area, including a first plugging structure 110, a second plugging structure 120 and a third plugging structure 130 located at the leakage hole 143 of the foundation pit retaining structure 140, wherein the first plugging structure 110 is a plugging plate located on the inner side of the foundation pit and installed at the leakage hole 143 of the foundation pit retaining structure 140, the second plugging structure 120 is a quick-drying cement slurry injected and filled in a closed space formed by the plugging plate and the leakage hole 143, and the third plugging structure 130 is an outside-pit grouting body located outside the foundation pit retaining structure 140.
[0036] The leakage plugging structure 100 for leaking holes in a foundation pit retaining structure in soft soil areas provided by an embodiment of the present invention may be a steel formwork. In order to improve the reliability of the steel formwork connection and the strength to resist fluid pressure, the steel formwork may be welded to the steel section 141 of the foundation pit retaining structure 140.
[0037] In the soft soil area foundation pit retaining structure leakage hole plugging structure 100 provided by the embodiment of the present invention, the plugging plate can be a wooden template, and the outside of the wooden template is connected to the foundation pit retaining structure 140 through a steel mesh 111. At this time, the steel mesh 111 can be welded to the steel 141 of the foundation pit retaining structure 140.
[0038] The method and structure 100 for plugging leakage holes in a foundation pit retaining structure in a soft soil area provided by an embodiment of the present invention seals and plugs leakage holes 143 of a foundation pit retaining structure 140 through a first plugging structure 110, so as to prevent soil from continuing to flow out of the leakage holes 143, thereby avoiding the potential safety hazards to the foundation pit caused by flowing water, flowing soil, and flowing sand from the leakage holes 143 into the foundation pit; the second plugging structure 120 is used to fill and plug the leakage holes 143 of the foundation pit retaining structure 140 on the inner side of the foundation pit, so as to prevent excessive soil pressure outside the pit from affecting the first plugging structure. The structure 110 is impacted, causing the first plugging structure 110 to separate from the foundation pit retaining structure 140 and causing the risk of the leakage hole 143 continuing to expand; the third plugging structure 130 is used to fill and plug the leakage hole 143 of the foundation pit retaining structure 140 outside the foundation pit, so as to reinforce the soil outside the foundation pit retaining structure 140 to prevent collapse; the leakage hole 143 of the foundation pit retaining structure 140 is plugged by three plugging structures, thereby ensuring the safety of the foundation pit retaining structure 140 and reducing the safety risk of foundation pit collapse and settlement. The embodiment of the present invention has the advantages of simple plugging process, convenient construction, fast plugging speed, short plugging cycle and good plugging effect.
[0039] The present invention is not limited to the above-mentioned specific implementation modes. Obviously, the above-mentioned embodiments are only some embodiments of the embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.
Claims
1. A method for plugging leakage holes in foundation pit retaining structures in soft soil areas, characterized in that: include: Clean the leakage holes in the foundation pit retaining structure; Install plugging plates at the leakage holes of the foundation pit retaining structure to construct the first plugging structure for the leakage holes, and seal the leakage holes of the foundation pit retaining structure through the first plugging structure; The first sealing structure is used as a template to inject quick-drying cement slurry into the leakage holes of the foundation pit retaining structure to construct the second sealing structure for the leakage holes, and the leakage holes of the foundation pit retaining structure are filled and sealed inside the foundation pit through the second sealing structure; Backfill the foundation pit on the side where the leakage hole of the foundation pit retaining structure is located, so that the height of the backfill soil exceeds the leakage hole; The third plugging structure is constructed on the outside of the foundation pit retaining structure by drilling and grouting outside the pit to plug the leakage holes, and the leakage holes of the foundation pit retaining structure are filled and plugged externally on the outside of the foundation pit through the third plugging structure; Remove the backfill soil in the foundation pit.
2. The method for plugging leakage holes in foundation pit retaining structure in soft soil area according to claim 1 is characterized in that: Drill holes outside the pit on the outside of the foundation pit retaining structure and use double-liquid grouting pipes to construct the third sealing structure for the leaking holes.
3. The method for plugging leakage holes in foundation pit retaining structure in soft soil area according to claim 1 is characterized in that: The third sealing structure is constructed on the outside of the foundation pit retaining structure by drilling holes outside the pit and injecting polyurethane to the leaking holes.
4. The method for plugging leakage holes in foundation pit retaining structure in soft soil area according to claim 1 is characterized in that: The blocking plate is a steel template.
5. The method for plugging leakage holes in foundation pit retaining structure in soft soil area according to claim 1, characterized in that: The blocking plate is a wooden formwork, and is connected to the foundation pit retaining structure through a steel mesh on the outer side of the wooden formwork.
6. A leakage plugging structure for foundation pit retaining structure in soft soil area, characterized in that: It includes a first plugging structure, a second plugging structure and a third plugging structure at the leakage holes of the foundation pit retaining structure. The first plugging structure is a plugging plate located on the inner side of the foundation pit and installed at the leakage holes of the foundation pit retaining structure. The second plugging structure is a quick-drying cement slurry injected and filled in the closed space formed by the plugging plate and the leakage holes. The third plugging structure is an outside-pit grouting body located on the outside of the foundation pit retaining structure.
7. The seepage hole plugging structure of the foundation pit retaining structure in soft soil area according to claim 6 is characterized in that: The blocking plate is a steel template.
8. The seepage hole plugging structure of the foundation pit retaining structure in soft soil area according to claim 7 is characterized in that: The steel template is welded to the steel sections of the foundation pit retaining structure.
9. The seepage hole plugging structure of the foundation pit retaining structure in soft soil area according to claim 6, characterized in that: The blocking plate is a wooden formwork, and is connected to the foundation pit retaining structure through a steel mesh on the outside of the wooden formwork.
10. The seepage hole plugging structure of the foundation pit retaining structure in soft soil area according to claim 9, characterized in that: The steel mesh is welded to the steel sections of the foundation pit retaining structure.