CN114775630A - Plugging method for deep foundation pit support structure - Google Patents
Plugging method for deep foundation pit support structure Download PDFInfo
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- CN114775630A CN114775630A CN202210383277.1A CN202210383277A CN114775630A CN 114775630 A CN114775630 A CN 114775630A CN 202210383277 A CN202210383277 A CN 202210383277A CN 114775630 A CN114775630 A CN 114775630A
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- hole
- grouting
- foundation pit
- dry kelp
- support structure
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 241000512259 Ascophyllum nodosum Species 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 19
- 235000019353 potassium silicate Nutrition 0.000 claims description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920004933 Terylene® Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- 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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a method for plugging a deep foundation pit support structure, which is used for plugging holes formed on the support structure and a stratum outside a foundation pit due to leakage, and comprises the following steps: providing dry kelp, filling the dry kelp in the hole, and utilizing the water absorption expansion of the dry kelp to block the hole; and providing a grouting material, and injecting the grouting material into the hole to fill the hole. According to the invention, the dry kelp is used for filling the hole opening of the hole, and water in the hole is absorbed by the dry kelp, so that the volume of the dry kelp can be expanded by about 3 times, thus the hole opening of the hole can be tightly sealed, gaps among the dry kelp can be filled, the overflow of grouting materials in the grouting process can be greatly reduced, the consumption of the grouting materials is reduced, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a method for plugging a deep foundation pit support structure.
Background
The foundation pit leakage is a common construction defect in the construction of a foundation pit enclosure structure, particularly, groundwater in coastal areas and southern areas is abundant, the water level is high, water outside the foundation pit enclosure leaks into the foundation pit, the construction period is influenced, and safety accidents are caused.
The traditional plugging method generally injects grouting materials into the leakage hole to plug the leakage hole, but the grouting materials can be solidified only by needing a period of time under the action of water pressure, and the grouting materials continuously overflow and flow out when the grouting materials are injected, so that the consumption of the grouting materials is large, and the construction cost is high. Even when the water pressure outside the foundation pit enclosure is large, the situation of plugging failure is often generated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a plugging method for a deep foundation pit support structure, so as to solve the problems that the conventional plugging method consumes large grouting material and even causes plugging failure.
In order to achieve the aim, the invention provides a leakage stopping method of a deep foundation pit support structure, which is used for stopping holes formed on the support structure and a stratum outside a foundation pit due to leakage, and comprises the following steps:
providing dry kelp, filling the dry kelp at the hole of the hole, and utilizing the dry kelp to absorb water and expand so as to seal the hole of the hole;
and providing a grouting material, and injecting the grouting material into the hole to fill the hole.
According to the invention, the dry kelp is used for filling the hole opening of the hole, and water in the hole is absorbed by the dry kelp, so that the volume of the dry kelp can be expanded by about 3 times, thus the hole opening of the hole can be tightly sealed, gaps among the dry kelp can be filled, the overflow of grouting materials in the grouting process can be greatly reduced, the consumption of the grouting materials is reduced, and the construction cost is reduced.
The method for plugging the deep foundation pit support structure is further improved in that the dry kelp is bound and fixed in bundles before the dry kelp is filled.
The method for plugging the deep foundation pit support structure is further improved in that a water permeable mesh bag is provided before the dry kelp is plugged, the provided water permeable mesh bag can permeate water and filter sand, and the dry kelp is filled into the water permeable mesh bag.
The method for plugging the deep foundation pit support structure is further improved in that after the dry kelp is bagged, the dry kelp is bagged in a plurality of bags, and the dry kelp in the plurality of bags is bound and fixed.
The method for plugging the deep foundation pit support structure is further improved in that the water permeable mesh bag is a polyester bag.
The method for plugging the deep foundation pit support structure is further improved in that the injected grouting materials comprise cement paste and water glass.
The method for plugging the deep foundation pit support structure is further improved in that the cement paste is injected firstly when the grouting material is injected, and the water glass is injected when the cement paste overflows.
The method for plugging the deep foundation pit support structure is further improved in that when the dry kelp is plugged, a grouting hole is reserved on the dry kelp;
and when the grouting material is injected, providing a grouting pipe, inserting the grouting pipe into the hole through the grouting hole, and injecting the grouting material into the hole through the grouting pipe.
The method for plugging the deep foundation pit support structure is further improved in that the grouting is continuously performed to plug the grouting hole in the process of pulling out the grouting pipe.
The method for plugging the deep foundation pit support structure is further improved in that a first injection end and a second injection end are formed at one end, far away from the hole, of the provided injection pipe, and different injection materials can be injected through the first injection end and the second injection end.
Drawings
Fig. 1 is a flow chart of a plugging method of the deep foundation pit support structure of the invention.
FIG. 2 is a construction state diagram of the plugging method of the deep foundation pit support structure of the invention.
In the figure: the construction method comprises the following steps of a building envelope 10, a foundation pit external stratum 20, a hole 30, dry kelp 40, a grouting pipe 50, a first injection end 51, a second injection end 52 and a water-permeable mesh bag 60.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a plugging method of a deep foundation pit support structure, which is used for plugging holes formed on the support structure and a stratum outside a foundation pit due to leakage.
The method for plugging the deep foundation pit support structure of the invention is explained below with reference to the accompanying drawings.
Referring to fig. 1, in this embodiment, a method for plugging a hole 30 formed in an enclosure 10 and a ground layer 20 outside a foundation pit due to leakage includes the following steps:
s101: providing dry kelp 40, filling the dry kelp 40 at the hole of the hole 30, and utilizing the dry kelp 40 to absorb water and expand to seal the hole of the hole 30;
s102: a grouting material is provided and injected into the hole 30 to fill the hole 30.
In the plugging method in the embodiment, the dry kelp 40 is used for plugging the hole of the hole 30, so that the dry kelp 40 absorbs water and expands to plug the hole of the hole 30 and plug the gap between the dry kelp 40, the overflow of grouting materials is effectively prevented, the plugging and curing are rapid, the lasting time is long, the curing effect is obvious, the using amounts of cement and water glass can be greatly reduced, the plugging construction cost is reduced, the effect of preventing the overflow of silt is achieved, the cement slurry and the dry kelp 40 are alkaline, and the chemical reaction cannot occur when the cement slurry and the dry kelp 40 are contacted with each other. The dry kelp 40 is a natural ecological green organism, reduces the risk of environmental pollution and realizes green construction.
In a specific embodiment, the dry kelp 40 is bound and fixed in a bundle before the dry kelp 40 is packed, and the dry kelp 40 is bound and fixed in a bundle to prevent the dry kelp 40 from loosening, thereby ensuring that the dry kelp 40 is densely packed and blocked.
Further, before the dry kelp 40 is stuffed, a water permeable mesh bag 60 is provided, the water permeable mesh bag 60 being provided to be permeable to water and filter sand, and the dry kelp 40 is packed in the water permeable mesh bag 60.
Further, after the dry kelp 40 is bagged, the number of the bagged dry kelp 40 is several, and several bags of the dry kelp 40 are bound and fixed.
Preferably, iron wires are provided to bind and fix the bags of the dry kelp 40 together, so as to prevent the dry kelp from being scattered by excessive water pressure.
Preferably, the water permeable mesh bag 60 is a polyester bag.
In one embodiment, the injected grouting material includes cement paste and water glass.
Further, when the grouting material is injected, the cement paste is injected firstly, and when the cement paste overflows, the water glass is injected again.
Furthermore, when the dry kelp 40 is stuffed, a grouting hole is reserved on the dry kelp 40;
when the grouting material is injected, a grouting pipe 50 is provided, the grouting pipe 50 is inserted into the hole 30 through the grouting hole, and the grouting material is injected into the hole 30 through the grouting pipe 50.
Further, during the process of pulling out the grouting pipe 50, grouting is continuously performed to seal the grouting hole.
In a preferred embodiment, a first injection end 51 and a second injection end 52 are formed on the end of the injection pipe 50 away from the hole 30, and different injection materials can be injected through the first injection end 51 and the second injection end 52. For example, the first injection end 51 is used for injecting cement slurry, and the second injection end 52 is used for injecting water glass.
In a preferred embodiment, the method specifically comprises the following steps:
(1) before grouting, a plurality of openings are cut in the directional expansion direction of the terylene bag containing the dry kelp 40 by a cutter so that the dry kelp 40 absorbs water and expands. The dry kelp 40 physically expands after absorbing water to fill gaps, so that the effects of blocking the gaps and preventing quicksand and mud flow are achieved.
(2) After the dried kelp 40 is bound and bagged, the leakage gap is tightly plugged without leaving any gap. When the leakage gap space is too large, the dry kelp 40 should be wrapped with iron wire and fixed and connected. Preventing the water pressure from being dispersed by overlarge pressure.
(3) The main purpose of the dried kelp 40 for plugging the hole of the hole 30 is solid-liquid separation: before double-liquid grouting, water is allowed to flow out, and sandy soil is prevented from flowing out. After the dried kelp 40 is bound, a terylene filter screen with strong water permeability and better sand filtration performance is wrapped outside the kelp. After the double-liquid grouting, the liquid permeates into the gaps of the dried kelp 40, and a firm water stop barrier is formed after the quick curing, so that the aim of stopping leakage of the foundation pit is fulfilled.
(4) During grouting, firstly pumping cement slurry, observing whether the cement slurry flows out of a water leakage point, observing the water leakage point after pumping for about 15min, pumping a water glass solution when the black brown cement slurry overflows, gradually thickening the slurry leaking out of a seepage point after about 30min due to the coagulation and solidification effects of the water glass, and closing the seepage point after about 45 min. In order to enhance the sealing effect and fill up the possible cracks, the in-situ grouting is continued, then the water glass solution is stopped from being fed, and the cement slurry is injected while the pipe is pulled upwards so as to fill up the holes 30 formed in the grouting process.
(5) Due to the expansion of the dry kelp 40, the effect of stopping flowing sand is obvious, and after sand water cannot flow out, the water pressure outside the foundation pit can be obviously increased, so that certain influence is caused on grouting. The control of grouting pressure and grouting time is very critical. Because the dry kelp 40 can prevent the loss of grouting liquid while expanding, can be better coagulated, solidified rapidly in the surface and space of the dry kelp 40, should adopt measures such as increasing the grouting pressure, reducing the grouting consumption, circulating grouting, etc. to block, solidify at this moment.
The working flow of the plugging method of the deep foundation pit support structure 10 of the present invention is explained below.
(1) Mounting and trial running of a grouting machine; (2) preparing cement paste, water glass and dried kelp 40 materials; (3) tying the dried kelp 40 into a plurality of bundles by nylon ropes; (4) packing every 4-6 bundles into a bag according to the hole size of the holes 30 by using a water-permeable filter screen; (5) according to the size of the hole 30, simultaneously plugging the hole by a plurality of bags of dried kelp 40, connecting the bags by iron wires and the like, fixing the bags on a waterproof curtain, and reserving an injection port of a grouting pipe 50; (6) inserting the modified slip casting pipe 50; (7) injecting cement paste according to the proportion; (8) injecting water glass according to the proportion; (9) pulling and inserting the grouting pipe 50, and circulating the steps (7) and (8); (10) and (5) after grouting, pulling out the pipe for observation, and completing the plugging construction.
It should be noted that the structures, the proportions, the sizes, and the like shown in the drawings attached to the present specification are only used for matching the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions of the present invention, so that the present invention has no technical essence, and any modifications of the structures, changes of the proportion relation, or adjustments of the sizes, can still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Claims (10)
1. A method for plugging a deep foundation pit support structure is used for plugging holes formed on the support structure and a stratum outside a foundation pit due to leakage, and is characterized by comprising the following steps:
providing dry kelp, filling the dry kelp at the hole of the hole, and utilizing the dry kelp to absorb water and expand so as to seal the hole of the hole;
and providing a grouting material, and injecting the grouting material into the hole to fill the hole.
2. The method for plugging the deep foundation pit support structure according to claim 1, wherein the dry kelp is bound and fixed in a bundle before the dry kelp is stuffed.
3. A method for plugging a deep foundation pit envelope according to claim 1, wherein a water permeable mesh bag is provided before the dry kelp is packed, the provided water permeable mesh bag is permeable to water and filter sand, and the dry kelp is packed in the water permeable mesh bag.
4. The method for stopping leakage of the deep foundation pit support structure according to claim 3, wherein after the dry kelp is bagged, the number of the dry kelp is a plurality of bags, and the plurality of bags of the dry kelp are bound and fixed.
5. The method for plugging the deep foundation pit support structure according to claim 3, wherein the water permeable mesh bag is a polyester bag.
6. The method for plugging the deep foundation pit support structure according to claim 1, wherein the injected grouting material comprises cement paste and water glass.
7. The method for stopping leakage of a deep foundation pit support structure according to claim 6, wherein the cement paste is injected first when the grouting material is injected, and the water glass is injected again when the cement paste overflows.
8. The method for plugging the deep foundation pit support structure according to claim 1, wherein when the dry kelp is plugged, a grouting hole is reserved on the dry kelp;
and when the grouting material is injected, providing a grouting pipe, inserting the grouting pipe into the hole through the grouting hole, and injecting the grouting material into the hole through the grouting pipe.
9. The method for plugging the deep foundation pit support structure according to claim 8, wherein during the process of pulling out the grouting pipe, grouting is continuously performed to plug the grouting hole.
10. The method for plugging a deep foundation pit support structure according to claim 8, wherein a first injection end and a second injection end are formed at one end of the provided grouting pipe away from the hole, and different grouting materials can be injected through the first injection end and the second injection end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210383277.1A CN114775630A (en) | 2022-04-12 | 2022-04-12 | Plugging method for deep foundation pit support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210383277.1A CN114775630A (en) | 2022-04-12 | 2022-04-12 | Plugging method for deep foundation pit support structure |
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| Publication Number | Publication Date |
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| CN114775630A true CN114775630A (en) | 2022-07-22 |
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| CN202210383277.1A Pending CN114775630A (en) | 2022-04-12 | 2022-04-12 | Plugging method for deep foundation pit support structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002243363A (en) * | 2001-02-14 | 2002-08-28 | Maruchu Setsubi Kogyo:Kk | Food raw material drying machine |
| CN102587400A (en) * | 2012-03-08 | 2012-07-18 | 天津建岩岩土工程有限公司 | Leakage-plugging method for water-stopping curtain |
| CN105201448A (en) * | 2015-09-24 | 2015-12-30 | 山东大学 | Method for water-stopping grouting plugging in high-pressure high-flow water gush channel |
| CN206189435U (en) * | 2016-09-26 | 2017-05-24 | 北京市勘察设计研究院有限公司 | It dredges groundwater block structure who afterwards blocks up to leak some elder generations to stagnant water curtain |
| CN107285723A (en) * | 2017-08-03 | 2017-10-24 | 上海欧卓实业发展有限公司 | A kind of improved loss circulation material |
| CN108999195A (en) * | 2018-08-22 | 2018-12-14 | 山东大学 | It is a kind of block the larger water burst of deep-foundation side wall stratum in the safe grouting construction process of step heap weir formula |
| CN214940041U (en) * | 2021-05-19 | 2021-11-30 | 中国建筑第八工程局有限公司 | Water leakage prevention structure of diaphragm wall |
-
2022
- 2022-04-12 CN CN202210383277.1A patent/CN114775630A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002243363A (en) * | 2001-02-14 | 2002-08-28 | Maruchu Setsubi Kogyo:Kk | Food raw material drying machine |
| CN102587400A (en) * | 2012-03-08 | 2012-07-18 | 天津建岩岩土工程有限公司 | Leakage-plugging method for water-stopping curtain |
| CN105201448A (en) * | 2015-09-24 | 2015-12-30 | 山东大学 | Method for water-stopping grouting plugging in high-pressure high-flow water gush channel |
| CN206189435U (en) * | 2016-09-26 | 2017-05-24 | 北京市勘察设计研究院有限公司 | It dredges groundwater block structure who afterwards blocks up to leak some elder generations to stagnant water curtain |
| CN107285723A (en) * | 2017-08-03 | 2017-10-24 | 上海欧卓实业发展有限公司 | A kind of improved loss circulation material |
| CN108999195A (en) * | 2018-08-22 | 2018-12-14 | 山东大学 | It is a kind of block the larger water burst of deep-foundation side wall stratum in the safe grouting construction process of step heap weir formula |
| CN214940041U (en) * | 2021-05-19 | 2021-11-30 | 中国建筑第八工程局有限公司 | Water leakage prevention structure of diaphragm wall |
Non-Patent Citations (2)
| Title |
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Application publication date: 20220722 |