CN113373962A - Combined leaking stoppage construction method for deep foundation pit - Google Patents
Combined leaking stoppage construction method for deep foundation pit Download PDFInfo
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- CN113373962A CN113373962A CN202110780370.1A CN202110780370A CN113373962A CN 113373962 A CN113373962 A CN 113373962A CN 202110780370 A CN202110780370 A CN 202110780370A CN 113373962 A CN113373962 A CN 113373962A
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- foundation pit
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a combined leaking stoppage construction method for a deep foundation pit, which belongs to the technical field of foundation pit leaking stoppage and comprises the following steps: determining the position of a leakage point; the combined leakage stoppage is carried out by adopting a mode of firstly reducing pressure, then reinforcing and finally stopping leakage points: dewatering and pressure relief are carried out outside the foundation pit, grouting reinforcement is carried out in the foundation pit, and double-liquid grouting is carried out at a leakage point to block the leakage point; the method has the advantages that the leakage stoppage effect is good and the bearing capacity is strong through the combined leakage stoppage of the precipitation and pressure relief of the recharging well outside the foundation pit, the plugging and the reinforcement among the piles in the foundation pit and the double-liquid grouting at the leakage point.
Description
Technical Field
The invention belongs to the technical field of foundation pit leakage stoppage, and particularly relates to a combined leakage stoppage construction method for a deep foundation pit.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, more and more coastal areas are developed and utilized and limited by land use space, and the height and the depth of a building are also continuously increased, so that the depth of a foundation pit is increased more and more, and the problem of leakage of the deep foundation pit is increased more and more. Once the deep foundation pit has the water leakage problem, if the deep foundation pit cannot take treatment measures in time, the foundation pit collapse accident is easily caused. At present, common treatment methods generally comprise methods such as leak source plugging, grouting reinforcement, drainage and the like. However, the problems cannot be solved by adopting a single treatment method when complex conditions such as large foundation pit depth, poor soil quality, abundant underground water and the like are met.
The inventor finds that the single plugging construction method has the following disadvantages: 1. the leakage point plugging usually adopts a double-liquid grouting method, and pressurized grouting is needed in the construction process. However, as the leakage point is formed at the position, the soil body in the area is lost, so that corresponding resistance cannot be provided, and the curtain is easy to further damage in the pressurized grouting process; 2. grouting reinforcement in the foundation pit can improve the bearing capacity of the soil body in the area and reduce water leakage, but the full sealing of a leakage point cannot be realized generally; 3. the drainage in the pit is good for geological conditions, does not contain silt and silt layers, and leaked water does not contain silt, but for coastal impact plains, the geological conditions are poor, and the seepage contains more silt and silt, and the drainage method usually causes large-area settlement in the peripheral area.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a combined leaking stoppage construction method for a deep foundation pit.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a deep foundation pit combined leaking stoppage construction method, including the following steps:
determining the position of a leakage point;
the combined leakage stoppage is carried out by adopting a mode of firstly reducing pressure, then reinforcing and finally stopping leakage points: and (4) dewatering and pressure relief are carried out outside the foundation pit, grouting reinforcement is carried out in the foundation pit, and double-liquid grouting is carried out at the leakage point to block the leakage point.
As a further technical solution, the process of determining the location of the leak point is as follows: if the water level variation of the outer observation well of the waterproof curtain exceeds a first set value and the difference value between the water level of the outer observation well and the water level of the inner observation well of the waterproof curtain is smaller than a second set value, a leakage point exists in the waterproof curtain.
As a further technical scheme, wherein, the step process of precipitation and pressure relief outside the foundation pit is as follows:
and (4) starting a recharge well outside the foundation pit at the leakage position to reduce water and pressure, and reducing the water head difference at the inner side and the outer side of the foundation pit so as to reduce the external load of the waterproof curtain.
As a further technical scheme, the grouting reinforcement in the foundation pit comprises the following steps:
set up in the fender pile outside and add muscle shotcrete surface course and carry out the shutoff, creep into the pore-forming at the fender pile, penetrate cement slurry slip casting pipe, pour into the cement slurry and consolidate closely knit, form the slip casting and consolidate the district.
As a further technical scheme, before the reinforced sprayed concrete surface layer is plugged, soil and sundries between supporting piles at a water leakage position are removed, and the sand bags are utilized to tightly pile the holes between the piles.
As a further technical scheme, the concrete process of plugging the reinforced sprayed concrete surface layer comprises the following steps:
the outer side of the sand bag is provided with a steel bar net piece plug, the steel bar net piece is fixed on a support pile, and the outer side of the support pile is provided with a sprayed concrete cover to form a reinforced sprayed concrete surface layer.
As a further technical scheme, the depth of the formed hole is a set distance below a soil body disturbed by water seepage; the cement slurry grouting pipe obliquely penetrates into a hole of the support pile.
As a further technical scheme, the step process of plugging the leakage point by double-liquid grouting at the leakage point comprises the following steps:
perpendicular pore-forming is carried out apart from the waterproof curtain outside and sets for distance department, inserts biliquid slip casting pipe after the pore-forming is accomplished, pours into cement thick liquid into earlier, then pours into water glass, carries out the shutoff.
As a further technical scheme, during grouting, cement grout is injected firstly to find a water seepage channel, and when the cement grout continuously flows out of a water seepage part, water glass is injected simultaneously, so that the cement grout is rapidly solidified and hardened, the whole seepage channel is completely plugged, and the plugging work is completed.
As a further technical scheme, the vertical hole forming depth is a position with a set distance below a water leakage point.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
according to the construction method, a mode of firstly reducing pressure, then reinforcing and finally plugging a leakage point is adopted, when the foundation pit leaks, external precipitation pressure reduction is firstly carried out, backfill back pressure in the foundation pit is avoided, the manufacturing cost is reduced, the construction period is saved, then internal plugging and reinforcing are carried out, larger damage of a waterproof curtain caused by external pressurization, grouting and plugging is avoided, meanwhile, the problem of insufficient resistance of soil bodies among piles due to water and soil loss caused by foundation pit leakage is solved, and the bearing capacity of the supporting pile at the part is improved; and finally, injecting cement slurry under pressure outside the waterproof curtain, and after the cement slurry flows out of the foundation pit, beginning to inject water glass, so that the cement slurry is quickly solidified, and the whole leakage passage is completely blocked, thereby achieving the effect of stopping leakage.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic illustration of a composite leak stoppage according to one or more embodiments of the present invention;
FIG. 2 is a flow diagram of a method of composite lost circulation construction according to one or more embodiments of the present disclosure;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
the method comprises the following steps of 1, cement slurry grouting pipes, 2, a reinforced sprayed concrete surface layer, 3, a grouting reinforcement area, 4, supporting piles, 5, a waterproof curtain, 6, a recharge well, 7, a leakage point, 8 underground water level lines, 9 and double-liquid grouting pipes.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In a typical embodiment of the present invention, as shown in fig. 1-2, a method for constructing a deep foundation pit with combined plugging is provided, which comprises the following specific construction steps:
determining the position of a leakage point, and then analyzing the reason of the leakage problem;
the combined leakage stoppage is carried out by adopting a mode of firstly reducing pressure, then reinforcing and finally stopping leakage points: and (4) dewatering and pressure relief are carried out outside the foundation pit, grouting reinforcement is carried out in the foundation pit, and double-liquid grouting is carried out at the leakage point to block the leakage point.
In the method, the position of the leakage point is determined according to monitoring data, and if the water level change of an observation well at the outer side of the waterproof curtain is large (namely the water level change of the observation well at the outer side of the waterproof curtain exceeds a first set value) and the water level difference with the inner side of the waterproof curtain is not large (namely the difference value between the water level of the observation well at the outer side of the waterproof curtain and the water level at the inner side of the waterproof curtain is smaller than a second set value), the water leakage point of the waterproof curtain at the position is determined.
In this embodiment, the leakage point 7 occurs at a certain position of the waterproof curtain 5. Because the foundation pit water stopping measure is composed of the water stopping curtain, the water leakage point can only cause water leakage due to local damage of the water stopping curtain.
Specifically, the step process of precipitation and pressure relief outside the foundation pit is as follows:
and (3) starting the recharge well 6 at the outer side of the foundation pit at the leakage position to reduce precipitation and pressure, and reducing the water head difference at the inner side and the outer side of the foundation pit, so that the external load of the waterproof curtain is reduced, and the time for grouting reinforcement and leaking stoppage is saved.
In this step, recharge well itself sets up in the foundation ditch outside, and concrete accessible water pump precipitation pressure release.
The precipitation depth of the recharge well needs to be determined according to the surrounding situation of the field, and adverse effects on the surrounding environment due to excessive precipitation depth cannot be caused. The precipitation depth of the recharging well is ensured to be 2 times of the precipitation depth without important buildings.
Specifically, the step process of grouting reinforcement in the foundation pit comprises the following steps:
removing soil and sundries between 4 supporting piles at the water leakage part, densely piling large holes between the piles by using sand bags, arranging a phi 8 multiplied by 200 reinforcing steel bar net piece outside the sand bags for plugging, driving the reinforcing steel bar net piece into the supporting piles 4 at two sides by expansion bolts for fixing, spraying concrete covers outside the supporting piles by C20, wherein the surface layer thickness is 60mm, and forming a reinforced sprayed concrete surface layer 2;
and drilling a hole in the supporting pile 4 after the outer side between the piles is plugged, penetrating a cement slurry grouting pipe 1 at the hole depth of 50cm below a soil body disturbed by water seepage, and injecting 1:1 cement slurry for strengthening and compacting to form a grouting strengthening area 3.
And the cement slurry grouting pipe obliquely penetrates through a hole of the support pile, and then cement slurry is injected between the support pile and the waterproof curtain.
Specifically, the step process of plugging the leakage point by double-liquid grouting of the leakage point comprises the following steps:
slip casting reinforcement accomplishes the back in the foundation ditch, carries out perpendicular pore-forming in distance water-stop curtain outside 20cm department, and the pore-forming degree of depth is 1m department under the water leakage point, inserts biliquid slip casting pipe 9 after the pore-forming is accomplished, and biliquid slip casting pipe 9 bottom is less than groundwater level 8, at first pours into the water cement ratio 1:1, finding out a water seepage channel according to the field condition, being convenient for completely plugging the whole seepage area, and indicating that the whole seepage area is completely filled with grout when the water seepage part (namely a weak area caused by whole water leakage, which is equivalent to the position of a grouting reinforcement area 3) continuously and continuously stops the cement grout, and simultaneously injecting water glass, so that the cement grout is rapidly solidified and hardened, the whole seepage channel is completely plugged, and the plugging work is completed.
In the scheme, precipitation and pressure relief are firstly carried out outside the foundation pit, then grouting reinforcement is carried out in the foundation pit, and finally double-liquid grouting is carried out at a leakage point, so that combined leakage stoppage of the water leakage part of the deep foundation pit is realized, the leakage stoppage effect is good, and the bearing capacity is strong.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A combined leaking stoppage construction method for a deep foundation pit is characterized by comprising the following steps:
determining the position of a leakage point;
the combined leakage stoppage is carried out by adopting a mode of firstly reducing pressure, then reinforcing and finally stopping leakage points: and (4) dewatering and pressure relief are carried out outside the foundation pit, grouting reinforcement is carried out in the foundation pit, and double-liquid grouting is carried out at the leakage point to block the leakage point.
2. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 1, wherein the process of determining the position of the leaking point is as follows: if the water level variation of the outer observation well of the waterproof curtain exceeds a first set value and the difference value between the water level of the outer observation well and the water level of the inner observation well of the waterproof curtain is smaller than a second set value, a leakage point exists in the waterproof curtain.
3. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 1, wherein the step process of dewatering and pressure relief outside the foundation pit is as follows:
and (4) starting a recharge well outside the foundation pit at the leakage position to reduce water and pressure, and reducing the water head difference at the inner side and the outer side of the foundation pit so as to reduce the external load of the waterproof curtain.
4. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 1, wherein the step process of grouting reinforcement in the foundation pit is as follows:
set up in the fender pile outside and add muscle shotcrete surface course and carry out the shutoff, creep into the pore-forming at the fender pile, penetrate cement slurry slip casting pipe, pour into the cement slurry and consolidate closely knit, form the slip casting and consolidate the district.
5. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 4, wherein before the reinforced shotcrete surface layer is blocked, soil and sundries between supporting piles at the water leaking part are removed, and the sand bags are used for tightly piling the hollow holes between the piles.
6. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 5, wherein the concrete process of plugging the reinforced shotcrete surface layer is as follows:
the outer side of the sand bag is provided with a steel bar net piece plug, the steel bar net piece is fixed on a support pile, and the outer side of the support pile is provided with a sprayed concrete cover to form a reinforced sprayed concrete surface layer.
7. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 4, wherein the depth of the formed hole is a set distance below a soil body disturbed by water seepage; the cement slurry grouting pipe obliquely penetrates into a hole of the support pile.
8. The combined leakage stoppage construction method for the deep foundation pit as claimed in claim 1, wherein the step process of performing double-liquid grouting on the leakage points to stop the leakage points comprises the following steps:
perpendicular pore-forming is carried out apart from the waterproof curtain outside and sets for distance department, inserts biliquid slip casting pipe after the pore-forming is accomplished, pours into cement thick liquid into earlier, then pours into water glass, carries out the shutoff.
9. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 8, wherein during grouting, cement grout is injected first to find the water seepage passage, and when the cement grout is continuously discharged from the water seepage part, water glass is injected simultaneously, so that the cement grout is rapidly solidified and hardened, the whole seepage passage is completely blocked, and the leaking stoppage work is completed.
10. The combined leaking stoppage construction method for the deep foundation pit as claimed in claim 8, wherein the vertical hole forming depth is a set distance below the water leaking point.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718071A (en) * | 2021-12-30 | 2022-07-08 | 中铁十四局集团有限公司 | Plugging method suitable for junction of secant pile and continuous wall |
| CN115710922A (en) * | 2022-10-13 | 2023-02-24 | 广东一新长城建筑集团有限公司 | Leakage point plugging method for mixing pile waterproof curtain of foundation pit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114718071A (en) * | 2021-12-30 | 2022-07-08 | 中铁十四局集团有限公司 | Plugging method suitable for junction of secant pile and continuous wall |
| CN114718071B (en) * | 2021-12-30 | 2024-02-23 | 中铁十四局集团有限公司 | Plugging method suitable for junction of occluding pile and continuous wall |
| CN115710922A (en) * | 2022-10-13 | 2023-02-24 | 广东一新长城建筑集团有限公司 | Leakage point plugging method for mixing pile waterproof curtain of foundation pit |
| CN115710922B (en) * | 2022-10-13 | 2023-09-12 | 广东一新长城建筑集团有限公司 | Leakage point plugging method for stirring pile waterproof curtain of foundation pit |
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| CN113373962B (en) | 2022-09-13 |
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