CN110424432B - Basement well cushion layer plugging method under water pressure permeation condition - Google Patents
Basement well cushion layer plugging method under water pressure permeation condition Download PDFInfo
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- CN110424432B CN110424432B CN201910670536.7A CN201910670536A CN110424432B CN 110424432 B CN110424432 B CN 110424432B CN 201910670536 A CN201910670536 A CN 201910670536A CN 110424432 B CN110424432 B CN 110424432B
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- water
- grouting
- basement
- plugging
- basement well
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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
- 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
- E02D31/04—Watertight packings for use under hydraulic pressure
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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
Abstract
The invention discloses a basement well cushion layer plugging method under a water pressure permeation condition, which comprises the following steps of: carrying out surface cleaning on a cushion layer in a basement pit or a basement well; pouring early-strength impervious concrete on the surface of the cushion layer, and forming an impervious layer after solidification; and drilling holes at the water seepage holes of the impermeable layer, and grouting the drilled holes for plugging. The invention has the beneficial effects that: the grouting plugging agent can obviously reduce the using amount of the water stopping needle head and the chemical grouting agent, is suitable for grouting and plugging of the basement well cushion layer under the condition of poor underground precipitation effect or no precipitation, forms a new passage under the action of the self-pressure of underground water by pouring early-strength impervious concrete, completes grouting at low cost after the water stopping needle head is placed through drilling, and can enable the basement well cushion layer to have good water stopping effect.
Description
Technical Field
The invention relates to the technical field of cushion layer leakage stoppage, in particular to a method for stopping the leakage of a cushion layer of a basement well under a water pressure permeation condition.
Background
Chemical grouting is widely applied to waterproof and leaking stoppage of a basement well, but the waterproof and leaking stoppage effect is poor after a cushion layer is cast in place under the condition of pressure-bearing underground water to form a sand hole, and because the cushion layer of the basement well is poured, underground pressure-bearing water has more water seepage channels and holes in the cushion layer, so that drilling and grouting can not be performed on all fine water seepage holes, and most of chemical grout can also flow into the underground and can not achieve the expected water stopping effect even if grouting is performed through a grouting machine after drilling.
In addition, when the leakage blocking agent is used for blocking, due to the fact that a large number of sand holes are formed in the underground chamber pit and the large water head function is achieved, the leakage blocking agent cannot be completely and tightly combined with the cushion layer even if initial setting time is short under the water head function, and the corresponding water stopping function cannot be achieved.
If the water stopping needle is directly drilled on the basement well cushion and placed, the chemical grout is injected into the sand stratum by pressurizing the grouting machine, but the injected grout is seriously lost in the stratum due to more underground water seepage channels of the sand holes, the plugging effect is poor, and the water seepage of the sand holes are still caused after the grouting.
In addition, the bed course thickness under the basic raft is 100mm according to the design requirement, but in this engineering construction because the geological conditions are rock and sand stratum, on-the-spot does not possess the pipe well precipitation condition, this makes the water-bearing pressure in the original state stratum under the bed course to just form the sand hole seepage flow passageway in the bed course is pour to the basement bed course, makes the bed course surface ponding, leads to follow-up waterproofing membrane can't lay according to the design requirement.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a method for plugging a basement well cushion layer under a water pressure permeation condition, which solves the problems of cushion layer leakage under the action of a pressure-bearing underground water head after the basement well cushion layer is poured, the problem of unsatisfactory effect of plugging by drilling chemical grouting and the problem of unsatisfactory plugging by directly using a plugging agent to plug surface water seepage sand holes.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a basement well cushion layer plugging method under a water pressure permeation condition comprises the following steps:
s1, cleaning the surface of the cushion layer in the basement pit or the basement well;
s2, pouring early-strength impervious concrete on the surface of the cushion layer, and forming an impervious layer after solidification;
s3, drilling holes at the water seepage holes of the impermeable layer, and grouting the drilled holes for plugging.
Further, in S1, the wall surface of the basement well or the basement well within a range from the pad layer to a position higher than the pad layer by 20cm is roughened by percussion drilling, and then the surface of the pad layer is cleaned up to pump away excess seepage and siltation water.
Further, the cushion layer is formed by pouring concrete with the strength grade of C15.
Further, in S2, the early strength impervious concrete is poured into the basement pit or the basement well and compacted by vibration, and the seepage water in the basement pit or the basement well needs to be continuously extracted during the final setting process of the concrete.
Further, the early strength impervious concrete is labeled as C30P 6R.
Further, the thickness of the barrier layer is 20 cm.
Further, in S3, during grouting, a water-stopping needle is first placed in the drilled hole, and then the water-stopping needle is connected to a grouting machine to perform pressurized grouting.
Further, the method further comprises the steps of:
and S4, observing the water stopping effect after grouting is finished for 30 minutes, wherein if no water is accumulated in the underground chamber pit or the basement well, the grouting amount meets the grouting requirement, and the grouting and water stopping are qualified.
The invention has the beneficial effects that: the grouting plugging agent can obviously reduce the using amount of the water stopping needle head and the chemical grouting agent, is suitable for grouting and plugging of the basement well cushion layer under the condition of poor underground precipitation effect or no precipitation, forms a new passage under the action of the self-pressure of underground water by pouring early-strength impervious concrete, completes grouting at low cost after the water stopping needle head is placed through drilling, and can enable the basement well cushion layer to have good water stopping effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a basement well cushion plugging method under a hydraulic permeation condition in grouting according to an embodiment of the invention.
In the figure:
1. undisturbed iron-sand stratum; 2. a cushion layer; 3. an impermeable layer; 4. stopping the water needle head; 5. grouting machine; 6. a water seepage path.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1, a method for plugging a basement well cushion under a hydraulic infiltration condition according to an embodiment of the invention includes the following steps:
s1, cleaning the surface of the cushion layer 2 in the basement pit or the basement well;
s2, pouring early-strength impervious concrete on the surface of the cushion layer 2, and forming an impervious layer 3 after solidification;
s3, drilling holes at the water seepage holes of the impermeable layer 3, and grouting the drilled holes for plugging.
In a specific embodiment of the present invention, in S1, the wall surface of the basement well or the basement well ranging from the pad 2 to a distance higher than 220 cm is roughened by percussion drilling, and then the surface of the pad 2 is cleaned to remove excess seepage and siltation water.
In a particular embodiment of the invention, said underlayment 2 is cast of concrete with a strength grade C15.
In one embodiment of the present invention, the early strength impervious concrete is poured into the underground pit or the basement well and compacted by vibration at S2, and the seepage water in the underground pit or the basement well is continuously extracted during the final setting of the concrete.
In one embodiment of the invention, the early strength impervious concrete is designated as C30P 6R.
In a particular embodiment of the invention, the barrier layer 3 has a thickness of 20 cm.
In an embodiment of the present invention, in S3, during grouting, the water-stopping needle 4 is first placed in the drilled hole, and then the water-stopping needle 4 is connected to the grouting machine 5 for pressurized grouting.
In a specific embodiment of the present invention, the method further comprises the steps of:
and S4, observing the water stopping effect after grouting is finished for 30 minutes, wherein if no water is accumulated in the underground chamber pit or the basement well, the grouting amount meets the grouting requirement, and the grouting and water stopping are qualified.
In order to facilitate understanding of the above-described embodiments of the present invention, the following detailed description of the embodiments of the present invention is provided by way of specific usage.
The basement well (basement well or basement well) is formed by pouring concrete, the cushion layer 2 is positioned at the top of an original iron plate sand layer (pressure-bearing water layer) 1, the cushion layer 2 is formed by pouring concrete with the strength grade of C15, the top of the cushion layer 2 is the impermeable layer 3, the thickness of the impermeable layer 3 is 20cm, the impermeable layer 3 is formed by pouring early-strength impermeable concrete, and the early-strength impermeable concrete is C30P 6R.
The main principle of the invention is that a layer of early strength impervious concrete with the thickness of 20cm is poured on a cushion layer 2 of an original basement well to carry out surface weighting, so that confined water flowing out of sand holes of the cushion layer 2 forms a limited number of water seepage passages 6 in the newly poured early strength impervious concrete, an impermeable layer 3 is formed after the early strength impervious concrete is hardened and solidified, the water seepage passages 6 are communicated with water seepage holes on the surface of the impermeable layer 3, then the water seepage holes on the impermeable layer 3 are drilled and grouted, so that chemical grout is completely filled in the water seepage passages 6 and part of the cushion layer 2, and the underground confined water is separated by the method, thereby not only avoiding the loss of a large amount of chemical grout, but also having good water stopping effect by grouting.
The method for plugging the basement well cushion under the condition of water pressure permeation specifically comprises the following steps:
1) and (3) roughening the wall surface in the range from the cushion layer 2 to a position 220 cm higher than the cushion layer in the underground chamber pit well by using a percussion drill so as to be beneficial to firm combination of new and old concrete, cleaning the surface of the cushion layer 2 and pumping away redundant seepage and siltation accumulated water.
2) Pouring early-strength impervious concrete (with the slump of 180 mm) into the basement well and ensuring that newly poured early-strength impervious concrete is vibrated compactly, wherein a new water seepage channel 6 is formed under the self pressure of underground water before the early-strength impervious concrete is initially set, and the early-strength impervious concrete is required to continuously extract seepage water in the basement well in the final setting process so as to prevent the water cement ratio of the newly poured early-strength impervious concrete from increasing and influence the quality after the final setting.
3) And drilling holes in the surface of the early-strength impervious concrete after final setting, placing water-stopping needles 4 in the drilled holes, and connecting the water-stopping needles with grouting machines 5 for pressurized grouting and water stopping, wherein the model of the grouting machines 5 is AG-U6.
4) And (5) observing the water stopping effect after 30 minutes of grouting is finished, wherein the grouting amount meets the grouting requirement if no water exists in the underground chamber pit well, and the grouting water stopping is qualified.
In conclusion, by means of the technical scheme, the defects that underground water precipitation conditions are poor or the basement well is waterproof and leaking stoppage under the self-pressurized water condition under the condition that the underground water level is not reduced are overcome; pouring early-strength impervious concrete with the thickness of 20cm on a cushion layer in a pit well of a basement at a water seepage position, forming a limited number of water seepage passages under the action of self water pressure, and changing the original cushion layer with more sand holes into a limited number of new water seepage passages; drilling a seepage hole formed on the surface of the early-strength impervious concrete, placing a water stopping needle, and grouting and blocking water by a grouting machine, so that the problems of blind grouting in a stratum after drilling a hole in a basement well and poor water blocking effect are solved; chemical slurry and a water-stopping needle head are saved in the whole process of water prevention and leakage stoppage, and the economic benefit is good.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A basement well cushion layer plugging method under a water pressure permeation condition is characterized by comprising the following steps:
s1, cleaning the surface of the cushion layer (2) in the basement pit or the basement well;
s2, pouring early-strength impervious concrete on the surface of the cushion layer (2), forming an impervious layer (3) after solidification, pouring the early-strength impervious concrete into the underground chamber pit or the underground well and vibrating to compact, wherein seepage water in the underground chamber pit or the underground well is required to be continuously extracted in the final setting process of the concrete;
s3, drilling holes at the water seepage holes of the impermeable layer (3), and grouting the drilled holes for plugging; utilize early strong impervious concrete is right bed course (2) carry out the surface ballast weight, make the confined water that flows from the eye of bed course (2) be in form limited quantity's infiltration passageway in the early strong impervious concrete, infiltration passageway and barrier layer (3) infiltration hole intercommunication on the surface carry out drilling slip casting to the infiltration hole on barrier layer (3), make chemical grout fill completely in infiltration passageway and partial bed course (2).
2. The method for plugging a basement well pad under hydraulic infiltration conditions according to claim 1, wherein in S1, the wall surface of the basement well or the basement well within a range from the pad (2) to a position 20cm higher than the pad (2) is roughened by impact drilling, and then the surface of the pad (2) is cleaned to remove excess infiltration sludge water.
3. The method for plugging the basement well cushion under the hydraulic infiltration condition as claimed in claim 1, wherein the cushion (2) is cast by concrete with the strength grade of C15.
4. The method for plugging the basement well cushion under the hydraulic infiltration condition as claimed in claim 1, wherein the early strength impervious concrete is marked as C30P 6R.
5. The method for plugging the basement well cushion under the hydraulic infiltration condition according to claim 2, wherein the thickness of the impervious layer (3) is 20 cm.
6. The method for plugging the basement well cushion under the hydraulic infiltration condition according to claim 1, wherein in S3, during grouting, a water-stopping needle (4) is firstly placed in the drilled hole, and then the water-stopping needle (4) is connected with a grouting machine (5) for pressurized grouting.
7. The method for plugging the basement well cushion under the condition of water pressure permeation as claimed in claim 1, wherein the method further comprises the following steps:
and S4, observing the water stopping effect after grouting is finished for 30 minutes, wherein if no water is accumulated in the underground chamber pit or the basement well, the grouting amount meets the grouting requirement, and the grouting and water stopping are qualified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910670536.7A CN110424432B (en) | 2019-07-24 | 2019-07-24 | Basement well cushion layer plugging method under water pressure permeation condition |
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| CN201910670536.7A CN110424432B (en) | 2019-07-24 | 2019-07-24 | Basement well cushion layer plugging method under water pressure permeation condition |
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| CN110424432B true CN110424432B (en) | 2021-09-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1370252A1 (en) * | 1986-09-22 | 1988-01-30 | Государственный Институт По Изысканиям И Проектированию Мостов "Ленгипротрансмост" | Counter-seepage lock of lining of underwater tunnel |
| CN208088323U (en) * | 2018-03-27 | 2018-11-13 | 广东中青建筑科技有限公司 | A kind of basement enclosure wall rises leak stopping reinforced structure |
| CN109098213A (en) * | 2018-08-29 | 2018-12-28 | 中国建筑第四工程局有限公司 | A kind of basement blocking method |
-
2019
- 2019-07-24 CN CN201910670536.7A patent/CN110424432B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1370252A1 (en) * | 1986-09-22 | 1988-01-30 | Государственный Институт По Изысканиям И Проектированию Мостов "Ленгипротрансмост" | Counter-seepage lock of lining of underwater tunnel |
| CN208088323U (en) * | 2018-03-27 | 2018-11-13 | 广东中青建筑科技有限公司 | A kind of basement enclosure wall rises leak stopping reinforced structure |
| CN109098213A (en) * | 2018-08-29 | 2018-12-28 | 中国建筑第四工程局有限公司 | A kind of basement blocking method |
Non-Patent Citations (1)
| Title |
|---|
| 注浆与抹面相结合治理某住宅楼地下室渗漏;位国喜等;《中国建筑防水》;20130520;第39-41页 * |
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