Deep foundation pit inter-pile leakage treatment method
By determining the seepage source and channels in the deep foundation pit, compacting the soil and inserting the grouting pipe and diversion pipe for sealing, the soil collapse and construction progress problems caused by leakage between piles in the deep foundation pit are solved, and the problem of soil collapse and delayed construction progress caused by leakage between piles is achieved. Efficient leakage treatment and shortening construction cycle effects.
Patent Information
- Application Number
- CN202411626600.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-18
AI Technical Summary
During the construction of deep foundation pits, leakage problems between piles lead to collapse of the soil on the side wall of the foundation pit, delayed construction progress and reduced foundation strength. Traditional treatment methods require excavation of a large amount of soil to increase construction volume and risks.
By determining the seepage source and seepage channels, compacting the soil, inserting the grouting pipe into the sealing slurry, installing the diversion pipe and sleeve valve pipe, gradually sealing the seepage ports and channels, and reducing the amount of soil excavation.
It effectively reduces the amount of water seepage, prevents soil on the side wall of the foundation pit from collapse, improves leakage treatment efficiency, shortens the construction cycle, and improves the construction quality of the foundation pit.
Smart Images
Figure CN119466045A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of foundation pit construction, in particular to a method for treating leakage between piles in a deep foundation pit. Background Art
[0002] The foundation pit is a soil pit excavated at the foundation design location according to the base elevation and foundation plane size. When the foundation pit is deep, in order to prevent the side wall of the foundation pit from collapsing, multiple cast-in-place piles need to be driven in before the excavation of the foundation pit soil, so that the cast-in-place piles are spaced around in a cylindrical shape, and then the soil is excavated downward in the cylindrical area to form a deeper and larger foundation pit. During the construction of ultra-deep foundation pits, the problem of leakage between piles has always been a difficulty and focus in the construction process. The harm of deep foundation pit seepage mainly includes the following aspects: affecting the construction progress and construction safety: deep foundation pit seepage will cause sudden surges in the foundation pit, and mesh or tree-like cracks will appear at the bottom of the foundation pit. Groundwater will surge out of the cracks, bringing out soil particles at the bottom of the foundation pit, causing sand flow, water spraying and sand emitting. This will cause water accumulation in the foundation pit, soften the foundation, reduce the foundation strength, and in severe cases, cause slope instability and suspension flow of the entire foundation, causing great difficulties for the construction progress. When water seepage occurs in traditional deep foundation pits, it is usually necessary to excavate the soil at the seepage site, then perform grouting to seal it, and then backfill the soil. This treatment process requires excavating a large amount of soil and requires a large amount of construction. At the same time, the soil excavation process can easily cause the side walls of the foundation pit to collapse, which greatly prolongs the construction period of the deep foundation pit. Summary of the invention
[0003] In view of this, the present invention provides a method for treating leakage between piles in a deep foundation pit, comprising the following steps:
[0004] S1: Determine the seepage source and the seepage channel according to the location of the seepage port, compact the soil directly above the seepage source, and reduce the amount of seepage from the seepage port;
[0005] S2: insert a grouting pipe from above the water seepage source, and use the grouting pipe to inject plugging slurry above and below the leakage area to plug the leakage area from the upper and lower sides;
[0006] S3: Clean the soil at the seepage opening, insert a diversion pipe along the seepage channel to the deep water source, and then pour concrete on the seepage opening to block the seepage opening;
[0007] S4: inject concrete slurry into the seepage channel area to block the seepage channel;
[0008] S5: insert the sleeve valve pipe obliquely above the water seepage channel, insert the end of the sleeve valve pipe into the water seepage source area, and inject concrete slurry into the sleeve valve pipe;
[0009] S6: After all concrete seals in the seepage source area and the seepage channel area are completely solidified, the diversion pipe is sealed.
[0010] Further, the process of inserting the grouting pipe is as follows:
[0011] S21: Drilling a plurality of grouting holes downwardly above the water seepage source area using a drilling machine; the grouting holes pass through the water seepage source area to below the water seepage source area;
[0012] S22: inserting a grouting pipe into the hole drilled by the drilling machine, the grouting pipe extending to below the water seepage source area, and injecting cement-water glass double slurry from the upper end of the grouting pipe as a plugging slurry to plug the area below the water seepage source area;
[0013] S23: Lift the grouting pipe upward so that the lower end of the grouting pipe is located above the water seepage source area, and inject cement-water glass double slurry as plugging slurry from the upper end of the grouting pipe again to plug the area above the water seepage source area.
[0014] Furthermore, the following process is performed between step S22 and step S23:
[0015] S221: lift the grouting pipe upwards so that the lower end of the grouting pipe is located in the water seepage source, and introduce the quilt into the water seepage source area through the grouting pipe.
[0016] Furthermore, in step S21, the diameter of the grouting holes is 50 mm-605 mm, the grouting holes are arranged in a plum blossom shape, and the grouting holes are inclined with an inclination angle ranging from 25° to 35°.
[0017] Furthermore, after step S6, step S7 is further performed:
[0018] S7: Cut the portion of the diversion pipe extending into the foundation pit.
[0019] Furthermore, in step S3, the guide pipe extends along the bottom of the seepage channel area to the seepage source area, and the side wall of the guide pipe extending to the seepage source area is provided with multiple water guide holes, and a filter is wrapped around the outside of the water guide holes, and a quilt is filled between the outer wall of the guide pipe and the filter.
[0020] Furthermore, in step S3, after the rear guide pipe is installed, a water delivery hose is connected to the guide pipe, and the water delivery hose is used to transport the water guided out of the guide pipe.
[0021] Further, in step S4, the process of injecting concrete slurry into the water seepage channel area to block the entire water seepage channel is as follows:
[0022] S41: Install a plugging template at the location where the soil at the seepage port is cleaned, and the template plugs the seepage port;
[0023] S42: inserting a grouting pipe obliquely into the water seepage channel from above the plugging template, and injecting concrete slurry into the water seepage channel area through a grouting pump;
[0024] Further, after step S42 is completed, step S43 is also performed.
[0025] S43: After the concrete slurry is injected into the seepage channel area, a waterproof gap is cleared at the top of the seepage channel, and a quick-hardening cement slurry is poured into the waterproof gap to form a waterproof coating.
[0026] Furthermore, the process of installing the plugging template in step S41 is as follows:
[0027] Install a plugging template at the seepage opening, wherein the edge of the plugging template is embedded in the soil at the edge of the seepage opening;
[0028] After the protective layers of the main reinforcements of the cast-in-place piles on both sides of the seepage opening are chiseled out, supporting steel bars are welded on the main reinforcements of the cast-in-place piles, and the supporting steel bars are used to support the blocking template.
[0029] The invention provides a method for treating leakage between piles in a deep foundation pit, and the beneficial effects are as follows:
[0030] (1) The treatment method includes the steps of determining the seepage source and the seepage channel, compacting the soil, injecting grout into the seepage source, installing a diversion pipe to block the seepage outlet, etc. After the seepage occurs in the foundation pit, the seepage treatment method first compacts the soil above the seepage source to reduce the amount of seepage from the seepage outlet on the side wall of the foundation pit, and prevents the water seeping from the seepage source from flushing out a large amount of soil from the side wall of the foundation pit, thereby causing the soil on the side wall of the foundation pit to collapse.
[0031] (2) When the leakage treatment method is used to seal the seepage outlet, a diversion pipe is first installed. A filter screen is also provided at the end of the diversion pipe. The diversion pipe can guide the water seeping out of the seepage source to prevent the water from seeping out of the seepage source from accumulating in the soil on the side wall of the foundation pit. At the same time, the diversion pipe can guide the water flow to flow in a directional manner, making it convenient for the staff to directly discharge the water diverted by the diversion pipe out of the foundation pit. In this way, the seepage water of the foundation pit can be prevented from accumulating in the foundation pit and affecting the subsequent construction of the foundation pit.
[0032] (3) When sealing the seepage source area, the leakage treatment method injects concrete slurry in multiple directions of the seepage source and injects concrete slurry into the seepage channel of the seepage source. This can fully seal the seepage source and prevent the seepage from flowing into the foundation pit through the seepage channel again, prevent the side wall of the foundation pit from seeping again, and improve the quality of leakage treatment and foundation pit construction.
[0033] (4) This seepage treatment method adopts the method of inserting pipe grouting when blocking the seepage source and the seepage channel area. This method can greatly reduce the amount of soil excavation in the seepage treatment method, thereby improving the efficiency of foundation pit seepage treatment and shortening the foundation pit construction period. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1It is a cross-sectional view of a construction structure of a method for treating leakage between piles in a deep foundation pit according to an embodiment of the present invention.
[0035] Figure 2 The present invention is a flowchart of a method for treating leakage between piles in a deep foundation pit according to an embodiment of the present invention.
[0036] In the above figure: 1- foundation pit body, 2- cast-in-place piles, 21- supporting steel bars, 3- seepage source, 31- grouting pipe, 32- sleeve valve pipe, 4- seepage channel, 41- diversion pipe, 5- seepage outlet, 51- blocking template, 6- waterproof coating. DETAILED DESCRIPTION
[0037] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0038] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 They are respectively a cross-sectional view and a flow chart of the construction structure of a method for treating leakage between piles in a deep foundation pit according to an embodiment of the present invention. A method for treating leakage between piles in a deep foundation pit according to the present invention is used to treat the problem of water seepage (leakage or gushing) between piles in a deep foundation pit. The deep foundation pit comprises a foundation pit body 1 and a plurality of cast-in-place piles 2. The cast-in-place piles 2 are concrete piles with main reinforcements provided inside. The plurality of cast-in-place piles 2 are arranged at intervals. When water seepage occurs, water flows out from the soil between the two cast-in-place piles 2 on the side wall of the foundation pit body 1. The water flow portion is a seepage port 5. A method for treating leakage between piles in a deep foundation pit according to the present invention comprises the following steps:
[0039] S1: Determine the seepage source 3 and the seepage channel 4 according to the position of the seepage port 5, compact the soil directly above the seepage source 3 and the seepage channel 4, and reduce the amount of seepage from the seepage port 5; wherein the position of the seepage source 3 can be determined by drilling a hole downward on the ground near the foundation pit, and the position of the seepage channel 4 is the area connecting the seepage source 3 and the seepage port 5. The soil compaction process of the soil directly above the seepage source 3 can be performed by a tamping machine or a road roller. This process is used to quickly reduce the amount of seepage from the seepage port 5 to prevent the water seeping from the seepage source 3 from flushing out a large amount of soil from the side wall of the foundation pit, causing the problem of soil collapse on the side wall of the foundation pit, and also prevent excessive seepage from flooding the bottom of the foundation pit 1.
[0040] S2: Insert the grouting pipe 31 from above the water seepage source, and use the grouting pipe 31 to inject plugging slurry above and below the leakage area to plug the leakage area from the upper and lower sides.
[0041] This step is used to prevent the formation of new water seepage openings 5 and water seepage channels 4.
[0042] S3: clean the soil of the seepage port 5, insert the diversion pipe 41 along the seepage channel 4 to the deep water source, and then pour concrete on the seepage port 5 to block the seepage port 5; and after installing the diversion pipe 41, connect a water hose to the diversion pipe 41, and the water hose is used to transport the water guided by the diversion pipe 41. At this time, the seepage source can only be drained through the diversion pipe 41, and the water hose can control the direction of the seepage, so that the water seeping from the seepage port 5 can be discharged outside the foundation pit body 1.
[0043] S4: Inject concrete slurry into the area of the water seepage channel 4 to block the water seepage channel 4; in this way, the water seepage channel 4 can be blocked by the concrete slurry.
[0044] S5: Insert the sleeve valve tube 32 obliquely above the seepage channel 4, insert the end of the sleeve valve tube 32 into the seepage source area, and inject concrete slurry into the sleeve valve tube 32; the concrete slurry and the soil in the seepage source area solidify into a whole, achieving the effect of plugging the seepage source 3.
[0045] S6: After all the concrete slurry seals in the water seepage source area and the water seepage channel 4 area are completely solidified, the guide pipe 41 is blocked.
[0046] The above process will be sealed by concrete slurry in multiple directions of the seepage source 3 (especially in the direction close to the foundation pit body 1), and concrete slurry will be injected into the entire seepage channel 4, so that the seepage source 3 can be fully sealed to prevent the seepage water from the seepage source 3 from flowing into the foundation pit body 1 again through the seepage channel, and to prevent the side wall of the foundation pit body 1 from seeping again, thereby improving the quality of leakage treatment and the quality of foundation pit construction. At the same time, when the leakage treatment method blocks the seepage source 3 and the seepage channel area, it adopts the method of inserting pipe grouting, which can greatly reduce the amount of soil excavation in the leakage treatment method, thereby improving the efficiency of foundation pit seepage treatment and shortening the foundation pit construction period.
[0047] In a preferred embodiment, the process of inserting the grouting pipe 31 in the above step S2 is as follows:
[0048] S21: Drill multiple grouting holes downwardly above the seepage source 3 area using a drilling machine; the grouting holes pass through the seepage source area to below the seepage source area; wherein the diameter of the grouting holes is 50mm-605mm, the positions of the grouting holes are arranged in a plum blossom shape, and the grouting holes are inclined, and the inclination angle ranges from 25° to 35°
[0049] S22: inserting a grouting pipe 31 into the hole drilled by the drilling machine, the grouting pipe 31 extending to below the water seepage source area, and injecting cement-water glass double slurry from the upper end of the grouting pipe 31 as a plugging slurry to plug the area below the water seepage source area;
[0050] S23: lift the grouting pipe 31 upward so that the lower end of the grouting pipe 31 is located above the water seepage source area, and inject cement-water glass double slurry from the upper end of the grouting pipe 31 again as plugging slurry to plug the area above the water seepage source area.
[0051] In the above process, two groutings can be completed through one drilling, and the upper and lower sides of the water seepage source area can be quickly sealed through this process. During the grouting process, the pressure gradually increases and the flow rate gradually decreases. When the pressure reaches the final pressure (0.3-0.5Mpa), the grouting of the hole is ended. Finally, quick-setting cement-water glass double slurry is used to seal the grouting hole.
[0052] In a preferred embodiment, the following process is further performed between step S22 and step S23:
[0053] S221: The grouting pipe 31 is lifted upwards so that the lower end of the grouting pipe 31 is located in the water seepage source area, and a quilt is introduced into the water seepage source area through the grouting pipe 31. The quilt is introduced into the water seepage source area to filter sand and soil, thereby preventing the soil in the water seepage source 3 from being carried out by the seepage water, thereby causing the problem of soil cavities.
[0054] In a preferred embodiment, step S6 is followed by step S7:
[0055] S7: Cut the portion of the guide pipe 41 extending into the foundation pit body 1, and embed the remaining portion of the guide pipe 41 into the water seepage channel area, and solidify into a whole with the concrete slurry in the water seepage channel area. This can prevent the guide pipe from affecting the subsequent construction process in the foundation pit body 1 and avoid the removal of the guide pipe 41.
[0056] In a preferred embodiment, in step S3, the guide pipe 41 extends along the bottom of the seepage channel area to the seepage source area, and the side wall of the guide pipe 41 extending to the seepage source area is provided with a plurality of water guide holes, and a filter screen is wrapped around the outside of the water guide holes, and a quilt is filled between the outer wall of the guide pipe 41 and the filter screen, so as to further prevent the problem of soil loss in the seepage source area.
[0057] In a preferred embodiment, in step S4, the process of injecting concrete slurry into the water seepage channel area to block the entire water seepage channel 4 is as follows:
[0058] S41: Install a plugging template 51 at the position where the soil of the seepage port 5 is cleaned, and the template plugs the seepage port 5;
[0059] S42: insert the grouting pipe 31 obliquely into the water seepage channel 4 from above the plugging template 51, and inject concrete slurry into the water seepage channel 4 area through a grouting pump;
[0060] S43: After the concrete slurry is injected into the water seepage channel area, a waterproof gap is cleared at the top of the water seepage channel 4, and a quick-hardening cement slurry is poured into the waterproof gap to form a waterproof coating 6.
[0061] In a preferred embodiment, the process of installing the blocking template 51 in step S41 is as follows:
[0062] A plugging template is installed at the seepage opening 5, and the edge of the plugging template is embedded in the soil at the edge of the seepage opening 5;
[0063] After the protective layer of the main reinforcement of the cast-in-place pile 2 on both sides of the seepage port 5 is chiseled, the support steel bars 21 are welded on the main reinforcement of the cast-in-place pile 2, and the support steel bars 21 support the plugging template 51. The plugging template 51 is supported by the support steel bars 21, so that its connection strength can be fully guaranteed, and the problem of the plugging template 51 falling off due to the grouting pressure during the grouting process of the seepage channel can be prevented.
[0064] The directional words such as front, back, top, bottom, etc. involved are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection requested by this application.
[0065] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.
[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for treating leakage between piles in a deep foundation pit, characterized in that: The steps include: S1: Determine the seepage source and the seepage channel according to the location of the seepage port, compact the soil directly above the seepage source, and reduce the amount of seepage from the seepage port; S2: inserting a grouting pipe from above the water seepage source, injecting plugging slurry into the upper and lower parts of the water seepage source area through the grouting pipe, and plugging the water seepage source area from the upper and lower sides; S3: Clean the soil at the seepage opening, insert a diversion pipe along the seepage channel to the deep water source, and then pour concrete on the seepage opening to block the seepage opening; S4: inject concrete slurry into the seepage channel area to block the seepage channel; S5: insert the sleeve valve pipe obliquely above the water seepage channel, insert the end of the sleeve valve pipe into the water seepage source area, and inject concrete slurry into the sleeve valve pipe; S6: After all concrete seals in the seepage source area and the seepage channel area are completely solidified, the diversion pipe is sealed.
2. A method for treating leakage between piles in a deep foundation pit according to claim 1, characterized in that: In step S2, the process of inserting the grouting pipe is as follows: S21: Drilling a plurality of grouting holes downwardly above the water seepage source area using a drilling machine; the grouting holes pass through the water seepage source area to below the water seepage source area; S22: inserting a grouting pipe into the hole drilled by the drilling machine, the grouting pipe extending to below the water seepage source area, and injecting cement-water glass double slurry from the upper end of the grouting pipe as a plugging slurry to plug the area below the water seepage source area; S23: Lift the grouting pipe upward so that the lower end of the grouting pipe is located above the water seepage source area, and inject cement-water glass double slurry as plugging slurry from the upper end of the grouting pipe again to plug the area above the water seepage source area.
3. A method for treating leakage between piles in a deep foundation pit according to claim 2, characterized in that: The following process is also performed between step S22 and step S23: S221: lift the grouting pipe upwards so that the lower end of the grouting pipe is located in the water seepage source, and introduce the quilt into the water seepage source area through the grouting pipe.
4. A method for treating leakage between piles in a deep foundation pit according to claim 2, characterized in that: In step S21, the diameter of the grouting holes is 50 mm-605 mm, the grouting holes are arranged in a plum blossom shape, and the grouting holes are inclined with an inclination angle ranging from 25° to 35°.
5. A method for treating leakage between piles in a deep foundation pit according to claim 1, characterized in that: After step S6, step S7 is also performed: S7: Cut the portion of the diversion pipe extending into the foundation pit.
6. A method for treating leakage between piles in a deep foundation pit according to claim 1, characterized in that: In step S3, the guide pipe extends along the bottom of the seepage channel area to the seepage source area, and the side wall of the guide pipe extending to the seepage source area is provided with multiple water guide holes, and a filter is wrapped around the outside of the water guide holes, and a quilt is filled between the outer wall of the guide pipe and the filter.
7. A method for treating leakage between piles in a deep foundation pit according to claim 6, characterized in that: In step S3, after the rear guide pipe is installed, a water delivery hose is connected to the guide pipe, and the water delivery hose is used to transport the water guided out of the guide pipe.
8. A method for treating leakage between piles in a deep foundation pit according to claim 6, characterized in that: In step S4, the process of injecting concrete slurry into the water seepage channel area to block the entire water seepage channel is as follows: S41: Install a plugging template at the location where the soil at the seepage port is cleaned, and the template plugs the seepage port; S42: Use a grouting pipe to obliquely insert into the water seepage channel from above the blocking formwork, and inject concrete slurry into the water seepage channel area through a grouting pump.
9. A method for treating leakage between piles in a deep foundation pit according to claim 6, characterized in that: After step S42 is completed, step S43 is further performed. S43: After the concrete slurry is injected into the seepage channel area, a waterproof gap is cleared at the top of the seepage channel, and a quick-hardening cement slurry is poured into the waterproof gap to form a waterproof coating.
10. A method for treating leakage between piles in a deep foundation pit according to claim 6, characterized in that: The process of installing the plugging template in step S41 is as follows: Install a plugging template at the seepage opening, wherein the edge of the plugging template is embedded in the soil at the edge of the seepage opening; After the protective layers of the main reinforcements of the cast-in-place piles on both sides of the seepage opening are chiseled out, supporting steel bars are welded on the main reinforcements of the cast-in-place piles, and the supporting steel bars are used to support the blocking template.