CN112695784A - Punching and grouting type leaking stoppage method for underground station open cut interval foundation pit support structure - Google Patents
Punching and grouting type leaking stoppage method for underground station open cut interval foundation pit support structure Download PDFInfo
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- CN112695784A CN112695784A CN202011430041.6A CN202011430041A CN112695784A CN 112695784 A CN112695784 A CN 112695784A CN 202011430041 A CN202011430041 A CN 202011430041A CN 112695784 A CN112695784 A CN 112695784A
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- Prior art keywords
- grouting
- foundation pit
- pipe
- plugging
- support structure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
Abstract
The invention discloses a punching and grouting type leakage stopping method for a foundation pit support structure in an open cut area of a subway station, which comprises the steps of drilling grouting holes penetrating through the foundation pit support structure at positions, which are away from a leakage position by preset intervals, on the foundation pit support structure; embedding a grouting pipe in the grouting hole, wherein the grouting pipe extends into a soil body outside the foundation pit support structure for a preset length, and plugging a gap between the grouting pipe and the inner wall of the grouting hole by adopting a plugging material; grouting into the soil body outside the foundation pit support structure by using a grouting machine through a grouting pipe until the water leakage phenomenon at the leakage position is eliminated; and plugging the grouting pipe. The perforating and grouting type plugging method has the advantages of good plugging effect, convenience and quickness in construction, suitability for large leakage amount and large water pressure and the like.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a punching and grouting type leaking stoppage method for a foundation pit support structure of an open cut section of a subway station.
Background
The leakage of the enclosure structure of the foundation pit in the open cut area of the subway station can cause surface subsidence, ground collapse, pipeline damage, house inclination damage and even collapse, and the risks caused by the leakage are not ignored. Therefore, when the building envelope leaks, the leakage must be stopped timely and effectively.
When large leakage and water pressure occur at the leakage position of the building enclosure, the leakage is usually blocked by adopting a grouting mode, wherein the leakage is blocked by drilling a grouting hole in the soil body on one side outside the building enclosure and then injecting leakage blocking slurry into the soil body through the grouting hole to block the leakage blocking hole, and particularly when the leakage water carries silt, the grouting type leakage blocking method is required to be adopted. The existing grouting type plugging method is to directly drill a grouting hole in the soil body outside the enclosure structure and perform grouting to perform plugging, the grouting position is not easy to control, and the plugging is not successful or the plugging effect is poor.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a punching and grouting type leaking stoppage method for a subway station open cut interval foundation pit support structure, which has the advantages of good leaking stoppage effect, convenience and quickness in construction and suitability for the conditions of large leakage amount and large water pressure.
In order to solve the technical problems, the invention adopts the following technical scheme:
a punching and grouting type leaking stoppage method for a foundation pit support structure of an open excavation section of a subway station comprises the following steps:
(S1) drilling grouting holes penetrating through the foundation pit enclosure structure at the position, away from the leakage position, of the foundation pit enclosure structure by a preset distance;
(S2) embedding a grouting pipe in the grouting hole, wherein the grouting pipe extends into the soil body outside the foundation pit support structure for a preset length, and a gap between the grouting pipe and the inner wall of the grouting hole is sealed by adopting a plugging material;
(S3) grouting into the soil outside the foundation pit support structure through a grouting pipe by using a grouting machine until the water leakage phenomenon at the leakage position is eliminated;
(S4) plugging the grouting pipe.
In the punching grouting type leakage stoppage method, preferably, the pipe wall of the grouting pipe extending into the soil body outside the foundation pit support structure is provided with a plurality of holes for communicating the cavity of the grouting pipe with the outside.
In the above drilling and grouting type plugging method, preferably, in the step (S2), the preset length of the grouting pipe extending into the soil outside the foundation pit support structure is 1.5m to 1.8 m.
In the above-mentioned perforation grouting type plugging method, preferably, in the step (S1), the preset distance between the grouting hole and the leaking part is 0.2m to 0.3 m.
In the above drilling and grouting type leak stoppage method, preferably, the grouting pipe is a hard galvanized pipe or steel pipe, and a plurality of circles of iron wires are bound and fixed on the outer pipe wall of the grouting pipe.
In the punching grouting type leakage plugging method, preferably, the end part of the grouting pipe is provided with an external thread, and after grouting is completed, the grouting pipe is plugged by a threaded cover matched with the external thread.
In the above-mentioned hole-grouting type plugging method, preferably, in the step (S4), the grouting slurry is a mixed slurry of cement slurry and water glass slurry, and the cement slurry: the volume ratio of the water glass slurry is 1:0.3, the water cement ratio of the cement slurry is 0.7, the concentration of the water glass in the water glass slurry is 41-43 Baume degrees, and the grouting pressure is 0.3-0.5 Mpa.
In the above perforation grouting type plugging method, preferably, the cross-sectional area of the grouting hole is gradually reduced from the outside to the inside.
In the above drilling and grouting type plugging method, preferably, the hole wall of the grouting hole is drilled with an annular groove surrounding the center line of the grouting hole.
In the drilling and grouting type leaking stoppage method, preferably, the hole wall of the grouting hole is drilled with a plurality of recessed holes which are arranged at intervals.
Compared with the prior art, the invention has the advantages that:
the invention relates to a punching and grouting type leakage stopping method for a foundation pit support structure in an open cut area of a subway station.
Drawings
Fig. 1 is a flow chart of a drilling and grouting type plugging method of a foundation pit support structure of an open cut section of a subway station.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1, the method for plugging a hole in a foundation pit support structure in an open cut area of a subway station in the embodiment includes the following steps:
(S1) drilling grouting holes penetrating through the foundation pit enclosure structure at the position, away from the leakage position, of the foundation pit enclosure structure by a preset distance;
(S2) embedding a grouting pipe in the grouting hole, wherein the grouting pipe extends into the soil body outside the foundation pit support structure for a preset length, and a gap between the grouting pipe and the inner wall of the grouting hole is sealed by adopting a plugging material;
(S3) grouting into the soil outside the foundation pit support structure through a grouting pipe by using a grouting machine until the water leakage phenomenon at the leakage position is eliminated;
(S4) plugging the grouting pipe.
The punching and grouting type leaking stoppage method for the foundation pit support structure in the open cut section of the subway station comprises the steps of firstly arranging a grouting hole on the foundation pit support structure and embedding a grouting pipe, then plugging a leaking part by adopting a mode of grouting into soil on the outer side of the foundation pit support structure through the grouting pipe, and then plugging the grouting pipe. The perforating and grouting type leaking stoppage method also has the advantages of convenience and rapidness in construction and wide application range.
In this embodiment, the pipe wall of the grouting pipe extending into the soil outside the foundation pit support structure is provided with a plurality of holes for communicating the grouting pipe cavity with the outside, and the holes increase points of the plugging slurry entering the soil, so that the plugging slurry can rapidly and uniformly enter the soil, and the plugging efficiency and the plugging effect are improved.
In this embodiment, in the step (S2), the preset length of the grouting pipe extending into the soil outside the foundation pit support structure is 1.5m to 1.8m, so that the plugging slurry flows from a position about 1.5m to 1.8m away from the leaking position to the leaking position, the slurry has sufficient setting time, the plugging effect is ensured, and the waste of the plugging slurry is reduced as much as possible. .
In this embodiment, in the step (S1), the preset distance between the grouting hole and the leaking part is 0.2m to 0.3m, so as to avoid expansion of the leaking situation at the leaking part due to the fact that cracks are spread to the leaking part when the grouting hole is drilled, and meanwhile, the grouting position is close to the leaking part due to the distance range, thereby avoiding the waste of the leaking stoppage slurry while ensuring the leaking stoppage effect.
In the embodiment, the grouting pipe is a hard galvanized pipe or a hard steel pipe, a plurality of circles of iron wires are bound and fixed on the outer pipe wall of the grouting pipe, and the iron wires can enhance the bonding strength of the plugging material and the grouting pipe, so that the plugging material is more difficult to be flushed away, and the plugging sealing performance can be enhanced.
In this embodiment, the tip of slip casting pipe is equipped with the external screw thread, treat slip casting accomplish the back adopt with external screw thread complex screw cap is with the slip casting pipe shutoff, adopts screw cap can be quick, convenient shutoff slip casting pipe.
In this example, in the step (S4), the slurry to be injected is a mixed slurry of cement slurry and water glass slurry, and the cement slurry: the volume ratio of the water glass slurry is 1:0.3, the water cement ratio of the cement slurry is 0.7, the concentration of the water glass in the water glass slurry is 41-43 Baume degrees, the grouting pressure is 0.3-0.5 Mpa, and plugging can be effectively formed.
In the embodiment, the cross-sectional area of the grouting hole is gradually reduced from outside to inside, so that the plugging material can be conveniently plugged, the plugging material is well combined with the inner wall of the grouting hole through subsequent compaction, the contact area of the plugging material and the grouting hole is increased, the combination strength of the plugging material and the inner wall of the grouting hole is improved, the plugging material is not easy to be flushed, a good plugging effect is formed, and the plugging material can adapt to the condition of higher leakage amount and water pressure.
The hole wall of the grouting hole is chiseled with an annular groove surrounding the central line of the grouting hole, the plugging material can be clamped into the annular groove to form a clamping structure, the plugging material is not easy to be flushed, meanwhile, the contact surface between the plugging material and the hole wall of the grouting hole is a roundabout labyrinth seal structure, the contact surface is increased, and the plugging tightness can be improved. In other embodiments, a plurality of recessed holes arranged at intervals can be drilled on the wall of the grouting hole, so that the leaking stoppage material can be prevented from being washed away, and the sealing performance can be improved to a certain extent.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (10)
1. A punching and grouting type leaking stoppage method for a foundation pit support structure of an open cut section of a subway station is characterized by comprising the following steps:
(S1) drilling grouting holes penetrating through the foundation pit enclosure structure at the position, away from the leakage position, of the foundation pit enclosure structure by a preset distance;
(S2) embedding a grouting pipe in the grouting hole, wherein the grouting pipe extends into the soil body outside the foundation pit support structure for a preset length, and a gap between the grouting pipe and the inner wall of the grouting hole is sealed by adopting a plugging material;
(S3) grouting into the soil outside the foundation pit support structure through a grouting pipe by using a grouting machine until the water leakage phenomenon at the leakage position is eliminated;
(S4) plugging the grouting pipe.
2. The perforating and grouting type leaking stoppage method as claimed in claim 1, wherein a plurality of holes for communicating the grouting pipe lumen with the outside are formed in the pipe wall of the grouting pipe extending into the soil outside the foundation pit enclosure structure.
3. The perforating and grouting type plugging method according to claim 1, wherein in the step (S2), the preset length of the grouting pipe extending into the soil outside the foundation pit enclosure is 1.5m to 1.8 m.
4. The perforating and grouting type plugging method of claim 1, wherein in the step (S1), the predetermined distance between the grouting holes and the leaking site is 0.2m to 0.3 m.
5. The perforating and grouting type leaking stoppage method as claimed in claim 1, wherein the grouting pipe is a hard galvanized pipe or a hard steel pipe, and a plurality of circles of iron wires are bound and fixed on the outer wall of the grouting pipe.
6. The perforating and grouting type leaking stoppage method as claimed in claim 5, wherein the end portion of the grouting pipe is provided with an external thread, and a threaded cover matched with the external thread is adopted to stop the grouting pipe after grouting is completed.
7. The perforating injection type plugging method of claim 1, wherein in said step (S4), the slurry to be injected is a mixed slurry of cement slurry and water glass slurry, and the ratio of cement slurry: the volume ratio of the water glass slurry is 1:0.3, the water cement ratio of the cement slurry is 0.7, the concentration of the water glass in the water glass slurry is 41-43 Baume degrees, and the grouting pressure is 0.3-0.5 Mpa.
8. A punch grouting type plugging method according to any one of claims 1 to 7, characterized in that the cross-sectional area of the grouting hole is gradually reduced from outside to inside.
9. The perforating and grouting type plugging method of claim 8, wherein the wall of the grouting hole is chiseled with an annular groove around the centerline of the grouting hole.
10. The perforating and grouting type leaking stoppage method as claimed in claim 8, wherein a plurality of recessed holes are drilled in the wall of the grouting hole and spaced from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011430041.6A CN112695784A (en) | 2020-12-07 | 2020-12-07 | Punching and grouting type leaking stoppage method for underground station open cut interval foundation pit support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011430041.6A CN112695784A (en) | 2020-12-07 | 2020-12-07 | Punching and grouting type leaking stoppage method for underground station open cut interval foundation pit support structure |
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| Publication Number | Publication Date |
|---|---|
| CN112695784A true CN112695784A (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011430041.6A Pending CN112695784A (en) | 2020-12-07 | 2020-12-07 | Punching and grouting type leaking stoppage method for underground station open cut interval foundation pit support structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112695784A (en) |
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2020
- 2020-12-07 CN CN202011430041.6A patent/CN112695784A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 熊周余: ""浅谈深基坑地下连续墙涌水涌砂防治方法"", 《浙江建筑》 * |
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Application publication date: 20210423 |