Leaking stoppage method for SMW construction method pile waterproof curtain

Abstract

The invention relates to the technical field of deep construction of constructional engineering, in particular to an SMW (soil mixing wall) pile waterproof curtain leaking stoppage method, which is characterized in that water flow at a leakage point is changed into a regional pressure relief point according to the water control characteristic that drainage is not as good as blockage, soil conservation is taken as a target, and stability of a soil body is ensured to ensure that a foundation pit and maintenance accord with a design state. The soil body loss after curtain support can be effectively prevented, and the situation that the soil body is separated from the support and the stability of the soil body is not controlled due to the fact that soil particles are brought out by water to form caves is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of deep construction of building engineering, in particular to a SMW method pile water-stopping curtain plugging method. Background Art

[0002] When the deep foundation pit of a construction project does not have a natural slope, in order to protect the surrounding roads, buildings, pipelines and other facilities from damage caused by settlement and deformation due to local excavation unloading and groundwater drainage during the deep foundation pit excavation process, and to reduce the workload of excavation and backfilling and speed up the construction period, support technology has developed rapidly. Among them, SMW construction method piles are used in large quantities. Because the underground soil and water level cannot be intuitively understood, and the underground hydrogeological differences lead to differences in the quality of SMW construction method piles, there are weaknesses in the water-stop curtain. If not handled in time, a large amount of water will flow into the outside of the curtain within 2h-12h, and the mud and sand brought out can cause the soil behind the empty piles to deform or even collapse the foundation pit, resulting in major safety and quality accidents. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problem, thereby providing a SMW method pile water-stopping curtain plugging method.

[0004] The present invention solves the above-mentioned problem by adopting the following technical solution: A SMW method pile water-stop curtain plugging method is carried out according to the following steps: Step 1: Dig a sump and use a water pump to drain water; ensure that there is no water accumulation on the working surface and ensure the safety of spot welding operations; Step 2: Use plates to block the 500mm area around the water gushing point. Use steel blocking plates to weld with the SMW pile steel on both sides; Step 3: Set up a drainage pipe on the plugging plate; its location should be around the leaking point, at any convenient location, and should be above the top elevation of the foundation; the main consideration is to facilitate the construction of the drainage pipe and the back filter layer; Step 4: After cleaning the back of the plugging board, add a water filter layer; a thin quilt is stuffed into the back of the plugging board as a water filter layer, and the thin quilt is compacted with a scaffolding pipe; compacting the quilt can replenish the lost soil and strengthen the support, and at the same time can enhance the water filtering effect; Step 5: Construction of the back plugging layer of the plugging plate; Since the water head height inside and outside the water-stop curtain is quite different, quick-setting materials are added during the process of inserting the quilt. After the quilt is squeezed and compacted, the upper end of the plate is plugged with quick-setting materials; Step 6: Set up a transfer water well; water from the drainage pipe must be drained away in time. Bury a section of well pipe at the edge of the sump excavated in step 1, introduce river water, and set up a pump to discharge it.

[0005] Furthermore, in step 2, the on-site sealing plate should be made of local materials, and the water-stop steel plate at the construction site can be used.

[0006] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: According to the water management characteristic that blocking is not as good as draining, the present invention transforms the water flow at the leakage point into a regional pressure relief point, takes soil conservation as the goal, ensures the stability of the soil body, and ensures that the foundation pit and maintenance meet the design status. It can effectively prevent the loss of soil body after curtain support, prevent water from bringing out soil particles to form caves, and separate the soil body from the support, resulting in the occurrence of uncontrolled soil stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention; Figure 2 For the embodiment of the present invention Figure 1 Schematic diagram of the cross-sectional structure of AA; Marked in the figure: SMW method pile steel 1, plugging layer 2, plugging plate 3, water filtering layer 4, drainage pipe 5, water transfer well 6. DETAILED DESCRIPTION

[0008] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0009] See also Figure 1-Figure 2 , a SMW method pile water-stop curtain plugging method, according to the following steps: Step 1: Dig a sump and use a water pump to drain water; ensure that there is no water accumulation on the working surface and ensure the safety of spot welding operations; Step 2: Use plates to block the 500mm area around the water gushing point. Use steel blocking plates to weld with the SMW pile steel on both sides; Step 3: Set up a drainage pipe on the plugging plate; its location should be around the leaking point, at any convenient location, and should be above the top elevation of the foundation; the main consideration is to facilitate the construction of the drainage pipe and the back filter layer; Step 4: After cleaning the back of the plugging board, add a water filter layer; a thin quilt is stuffed into the back of the plugging board as a water filter layer, and the thin quilt is compacted with a scaffolding pipe; compacting the quilt can replenish the lost soil and strengthen the support, and at the same time can enhance the water filtering effect; excavators, sledgehammers and other machines can also be used on site to assist in compacting the quilt. In practice, 7-10 quilts are stuffed into a leaking point to ensure that the water flowing out of the drainage pipe does not contain sand or soil particles, otherwise the water filter layer needs to be filled; Step 5: Construction of the back plugging layer of the plugging plate; Since the water head height inside and outside the water-stop curtain is quite different, quick-setting materials are added during the process of inserting the quilt. After the quilt is squeezed and compacted, the upper end of the plate is plugged with quick-setting materials; Step 6: Set up a transfer water well; water from the drainage pipe must be drained away in time. Bury a section of well pipe at the edge of the sump excavated in step 1, introduce river water, and set up a pump to discharge it.

[0010] Furthermore, in step 2, the on-site sealing plate should be made of local materials, and the water-stop steel plate at the construction site can be used.

[0011] According to the water management characteristic that blocking is not as good as draining, the present invention transforms the water flow at the leakage point into a regional pressure relief point, takes soil conservation as the goal, ensures the stability of the soil body, and ensures that the foundation pit and maintenance meet the design status. It can effectively prevent the loss of soil body after curtain support, prevent water from bringing out soil particles to form caves, and separate the soil body from the support, resulting in the occurrence of uncontrolled soil stability.

[0012] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A SMW pile water-stop curtain plugging method, characterized in that: Follow these steps: Step 1: Dig a sump and use a water pump to drain water; ensure that there is no water accumulation on the working surface and ensure the safety of spot welding operations; Step 2: Use plates to block the 500mm area around the water gushing point. Use steel blocking plates to weld with the SMW pile steel on both sides; Step 3: Set up a drainage pipe on the plugging plate; its location should be around the leaking point, at any convenient location, and should be above the top elevation of the foundation; the main consideration is to facilitate the construction of the drainage pipe and the back filter layer; Step 4: After cleaning the back of the plugging board, add a water filter layer; a thin quilt is stuffed into the back of the plugging board as a water filter layer, and the thin quilt is compacted with a scaffolding pipe; compacting the quilt can replenish the lost soil and strengthen the support, and at the same time can enhance the water filtering effect; Step 5: Construction of the back plugging layer of the plugging plate; Since the water head height inside and outside the water-stop curtain is quite different, quick-setting materials are added during the process of inserting the quilt. After the quilt is squeezed and compacted, the upper end of the plate is plugged with quick-setting materials; Step 6: Set up a transfer water well; water from the drainage pipe must be drained away in time. Bury a section of well pipe at the edge of the sump excavated in step 1, introduce river water, and set up a pump to discharge it.

2. A SMW construction pile water-stop curtain plugging method according to claim 1, characterized in that: In step 2, the on-site sealing plate should be made of local materials, and the water-stop steel plate at the construction site can be used.

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