CN107747317B - Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure - Google Patents
Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure Download PDFInfo
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- CN107747317B CN107747317B CN201710967836.2A CN201710967836A CN107747317B CN 107747317 B CN107747317 B CN 107747317B CN 201710967836 A CN201710967836 A CN 201710967836A CN 107747317 B CN107747317 B CN 107747317B
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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
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a soft rock foundation anti-seepage wall groove bottom sediment treatment method and a soft rock foundation anti-seepage wall groove bottom structure, wherein a curtain grouting pipe is pre-buried in an anti-seepage wall, the curtain grouting pipe is communicated to the anti-seepage wall groove bottom all the way, a steel anchoring piece is placed in the pre-buried curtain grouting pipe, one part of the steel anchoring piece is positioned in the pre-buried curtain grouting pipe, the other part of the steel anchoring piece extends out of the lower end of the pre-buried curtain grouting pipe, and the groove bottom of the soft rock foundation anti-seepage wall is filled or separated by a backfill cement slurry condensate. The invention effectively treats the sediment defect of the foundation impervious wall in the full and strong weathered soft rock, cuts off the permeation channel at the bottom of the impervious wall, ensures that the backfilled cement mortar or cement paste at the bottom of the wall and the upper impervious wall form effective anchoring by embedding the steel anchoring piece, becomes an integral structure, and improves the fastness of the foundation impervious wall groove of the full and strong weathered soft rock with large water permeability and poor filling property.
Description
Technical Field
The invention relates to a method for treating sediment at the bottom of a soft rock foundation impervious wall groove, which is suitable for the defect treatment of a full and strong weathered soft rock foundation impervious wall with high water permeability and poor filling property in hydraulic and hydroelectric engineering.
Background
The measure for controlling the foundation seepage of the water retaining building under the foundation geological condition of full strong weathered soft rock (saturated compressive strength is less than 30 Mpa) with high water permeability and poor filling property is established according to the height of the water retaining building, the use of a reservoir and the foundation geological condition and is determined through comprehensive technical and economic comparison.
The seepage-proofing measures of hydraulic building mainly include horizontal pavement seepage-proofing and vertical seepage-proofing.
The horizontal covering seepage prevention is the most commonly used seepage prevention measure, and is mainly used for prolonging the seepage path and reducing the seepage pressure and the seepage gradient of the foundation. The horizontal pavement is impermeable, and has the main advantages of simple construction and easy quality assurance. The seepage calculation shows that in order to meet the seepage stability requirement, the horizontal coverage length is longer, and the engineering quantity is larger. The vertical seepage-proofing wall and curtain grouting are generally adopted, wherein the concrete seepage-proofing wall is an underground continuous wall which is commonly adopted in hydraulic construction, has the advantages of wide adaptability, strong practicability, easy control of construction quality, safety, reliable technology, good seepage-proofing effect and the like, can be used according to the current construction technical specifications, is an effective measure for seepage-proofing treatment of a strong water permeability coating or full strong weathered soft rock geological condition with large water permeability and poor pourability, and is very successful in engineering seepage-proofing treatment.
In engineering, for water retaining buildings built on soft rocks with poor full weathering or strong weathering, a concrete impervious wall and curtain grouting impervious wall are generally adopted, the bottom of the impervious wall is preferably embedded with weak weathering bedrock, and curtain grouting is arranged at the lower part of the impervious wall.
Because the diaphragm wall is built under the geological condition of full and strong weathered soft rock, if the construction quality is not well controlled, such as the hole wall of a slotted hole is easy to collapse, the bottom sediment of the diaphragm wall is not cleaned up during casting, so that the thickness of the bottom sediment of the diaphragm wall is larger, the soft rock sediment is generally of a granular structure similar to sand, the water permeability is larger, if a plurality of groove sections are communicated, a leakage channel is formed at the bottom contact section of the diaphragm wall, and the bottom sediment defect treatment of the diaphragm wall is firstly carried out before the cement curtain grouting at the bottom of the diaphragm wall is carried out, therefore, it is very important to find an effective method for treating the bottom sediment defect of the diaphragm wall of the full and strong weathered soft rock foundation.
Disclosure of Invention
The invention aims to solve the technical problems that: aiming at the problems, the method for treating the bottom sediment of the soft rock foundation diaphragm wall tank is simple in structure, safe and reliable, and aims to solve the defect of the bottom sediment of the full and strong weathered soft rock foundation diaphragm wall tank with high water permeability and poor filling property. For this purpose, the invention adopts the following technical scheme:
the soft rock foundation impervious wall groove bottom sediment treatment method is characterized by comprising the following steps:
(1) Firstly, pre-burying a curtain grouting pipe when constructing a concrete cover plate and a impervious wall, wherein the curtain grouting pipe is communicated to the bottom of the impervious wall, and the curtain grouting pipe is arranged so that a pipeline which is distributed from the curtain grouting pipe is communicated with the bottom of the impervious wall to form a sediment cleaning suction passage;
(2) The method comprises the steps that water inlet pipes are arranged at intervals in the embedded curtain grouting pipes, low-pressure water flow is pressed into the bottom of an impervious wall groove through the water inlet pipes at the bottoms of the embedded curtain grouting pipes in the water inlet pipes, water absorption and air supply pipes are arranged between the two embedded curtain grouting pipes in the water inlet pipes, water absorption is carried out by the water absorption and air supply pipes, the bottom of the impervious wall groove is cleaned, and mud and fine rock particles are sucked out;
(3) After the cleaning is finished, the water inlet pipe is removed, a steel anchoring piece is placed in the pre-buried curtain grouting pipe, one part of the steel anchoring piece is positioned in the pre-buried curtain grouting pipe, and the other part of the steel anchoring piece extends out of the lower end of the pre-buried curtain grouting pipe;
(4) Placing a grouting pipe in the pre-buried curtain grouting pipe, grouting cement mortar or cement thick slurry into the bottom of the impervious wall through the grouting pipe, and simultaneously pressing low-pressure air into the water-absorbing and air-supplying pipe to ensure that slurry and large-particle sediments at the bottom of the impervious wall are uniformly mixed;
(5) And after the cement slurry backfilled at the bottom of the tank is finally solidified, grouting cement curtain at the bottom of the impervious wall according to a common construction procedure.
Further, after the step (1), determining the sediment situation at the bottom of the impervious wall groove by photographing in a hole of the curtain grouting hole, if the sediment thickness is smaller and the sediment is not communicated, directly performing curtain grouting according to a common construction procedure, and if the sediment thickness at the bottom of the impervious wall groove is larger, forming a continuous seepage channel, then turning to the step (2).
Further, curtain grouting pipes are arranged along the length direction of the impervious wall, the aperture is about phi 100-110 (mm), and the distance is 1-2 m.
Further, the steel anchoring piece is a steel pipe, the bottom of the steel pipe is provided with holes as a cement slurry circulation channel, the steel pipe is used for anchoring cement slurry backfilled at the bottom of the tank in the early stage, the steel pipe is used for grouting blocking at the lower contact section in the later stage, the diameter of the steel pipe is preferably phi 90 (mm), the bottom side wall of the steel pipe is provided with holes, and the diameter of the holes is preferably phi 75 (mm).
Further, the bottom of the seepage-proofing wall is backfilled with cement mortar or cement thick slurry, and a proper amount of accelerator can be added.
And further, after the cement slurry backfilled at the bottom of the tank reaches 75% of the designed strength after final setting, grouting cement curtain at the bottom of the impervious wall according to the common construction procedure.
The invention further aims to solve the technical problem of providing a soft rock foundation anti-seepage wall groove base structure, which improves the fastness of the full strong weathered soft rock foundation anti-seepage wall groove base with high water permeability and poor filling property. For this purpose, the invention adopts the following technical scheme:
the utility model provides a soft rock basis cut-off wall groove bottom structure, includes the cut-off wall, the cut-off wall is built on soft rock basis, its characterized in that the cut-off wall is pre-buried to have curtain grout pipe, curtain grout pipe lets through to the cut-off wall tank bottom all the time, has put into steel anchor assembly in the pre-buried curtain grout pipe, and steel anchor assembly is partly in pre-buried curtain grout pipe, and partly stretches out outside pre-buried curtain grout pipe lower extreme, is filled or cut off by backfilling cement thick liquid coagulum in soft rock basis cut-off wall tank bottom.
Further, curtain grouting pipes are arranged along the length direction of the impervious wall, the aperture is about phi 100-110 (mm), and the distance is 1-2 m.
Further, the steel anchoring piece is a steel pipe, the bottom of the steel pipe is provided with a hole as a circulating channel of cement slurry, the steel pipe is used for anchoring the cement slurry backfilled at the bottom of the tank in the early stage, the steel pipe is used for grouting blocking at the lower contact section in the later stage, the diameter of the steel pipe is preferably phi 90 (mm), and the diameter of the hole at the bottom is preferably phi 75 (mm).
The beneficial effects of the invention are as follows: the invention effectively treats the sediment defect of the foundation impervious wall in the full and strong weathered soft rock, cuts off the permeation channel at the bottom of the impervious wall, ensures that the backfilled cement mortar or cement paste at the bottom of the wall and the upper impervious wall form effective anchoring by embedding the steel anchoring piece, becomes an integral structure, and improves the fastness of the foundation impervious wall groove of the full and strong weathered soft rock with large water permeability and poor filling property.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
Detailed Description
As shown in figure 1, the soft rock foundation diaphragm wall tank bottom sediment treatment method provided by the invention is a treatment method for a leakage channel formed by tank bottom sediment in the construction process of the diaphragm wall on the basis of full strong weathered soft rock with high water permeability and poor filling property.
The embodiment is characterized in that a PVC curtain grouting pipe 3 pre-buried in a concrete cover plate 1 at the upper part of a concrete impervious wall and a impervious wall 2 is utilized, the curtain grouting pipe 3 is communicated to the bottom of the impervious wall, and when the PVC curtain grouting pipe 3 is arranged, a pipeline which is distributed from the curtain grouting pipe is communicated with the bottom of the impervious wall to form a sediment cleaning suction channel. Preferably, the water inlet pipe 6 is placed in the spaced curtain grouting pipe 3, the water suction pipe and the air supply pipe 8 are arranged in the middle, and the concrete construction method of the embodiment is as follows:
1. firstly, when the concrete cover plate 1 and the impervious wall 2 are constructed, the PVC curtain grouting pipes 3 are pre-buried, the aperture is about phi 100-110, the distance is 1-2 m, the pre-buried PVC curtain grouting pipes 3 can be determined according to curtain grouting parameters, and a sediment cleaning and sucking-out passage can be formed under the action of low-pressure water and air suction by associating the pre-buried PVC curtain grouting pipes 3.
2. Determining the sediment situation at the bottom of the seepage wall 2 through photographing in a curtain grouting hole, and directly performing curtain grouting 4 according to a common construction procedure if the sediment thickness is smaller and is not communicated;
3. if the sediment thickness at the bottom of the seepage wall 2 is larger, a continuous seepage channel is formed, a water inlet pipe 6 is arranged at intervals in the embedded PVC curtain grouting pipe 3, low-pressure water flow (the pressure is 0.2-0.3 MPa) is pressed in, the water absorption and supply pipe 8 is arranged by utilizing the embedded PVC curtain grouting pipe 3, a sediment cleaning suction channel is formed from the water inlet pipe arranged in the embedded PVC curtain grouting pipe 3 at one side to the water absorption and supply pipe 8 arranged in the embedded PVC curtain grouting pipe 3 at the middle through the bottom of the seepage wall, and the seepage wall bottom is cleaned, so that mud and fine rock particles are separated out;
4. after cleaning, a 1m long steel pipe 9 with the diameter phi 90 (mm) is placed in the pre-buried curtain grouting pipe, the steel pipe 9 is used for anchoring the tank bottom backfill cement slurry 5 in the early stage, the side wall of the bottom of the steel pipe is provided with a hole 10, the aperture phi 75 (mm) is used as a circulation channel of the cement slurry, and the steel pipe 9 is used for grouting blocking in the lower contact section in the later stage;
5. and a grouting pipe 7 is placed in the pre-buried curtain grouting pipe 3, cement mortar or cement thick slurry is poured into the bottom of the impervious wall through the grouting pipe 7, meanwhile, the water absorption and air supply pipe 8 is pressed into low-pressure air (the pressure is 0.2-0.3 MPa), uniform mixing of slurry and large-particle sediments at the bottom of the tank is ensured, and meanwhile, a proper amount of accelerator can be added.
Through the above steps, the following structure is formed: the anti-seepage wall 2 is pre-buried with a PVC curtain grouting pipe 3, the PVC curtain grouting pipe 3 is communicated to the bottom of the anti-seepage wall 2, a steel pipe 9 is placed in the PVC curtain grouting pipe as a steel anchoring piece, one part of the steel anchoring piece is positioned in the pre-buried curtain grouting pipe, the other part of the steel anchoring piece extends out of the lower end of the pre-buried curtain grouting pipe, and the bottom of the soft rock foundation anti-seepage wall is filled or separated by a condensate of backfilled cement slurry 5.
And after the final setting of the cement slurry backfilled at the bottom of the tank reaches 75% of the designed strength, directly performing cement curtain grouting 4 at the bottom of the impervious wall 2 according to the common construction procedure.
The above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (6)
1. A soft rock foundation impervious wall groove bottom sediment treatment method is characterized in that a soft rock foundation impervious wall groove bottom structure comprises an impervious wall, the impervious wall is built on a soft rock foundation, a curtain grouting pipe is embedded in the impervious wall, the curtain grouting pipe is communicated to the bottom of the impervious wall, a steel anchoring piece is placed in the embedded curtain grouting pipe, one part of the steel anchoring piece is located in the embedded curtain grouting pipe, the other part of the steel anchoring piece extends out of the lower end of the embedded curtain grouting pipe, and the bottom of the soft rock foundation impervious wall is filled or separated by backfilled cement slurry condensate; the steel anchoring piece is a steel pipe, the bottom of the steel pipe is provided with a hole and is used as a circulation channel of cement slurry, the steel pipe is used for anchoring the cement slurry backfilled at the bottom of the tank in the early stage, and is used for grouting blocking at the lower contact section in the later stage;
the soft rock foundation anti-seepage wall tank bottom sediment treatment method comprises the following steps:
(1) Firstly, pre-burying a curtain grouting pipe when constructing a concrete cover plate and a impervious wall, wherein the curtain grouting pipe is communicated to the bottom of the impervious wall, and the curtain grouting pipe is arranged so that a pipeline which is distributed from the curtain grouting pipe is communicated with the bottom of the impervious wall to form a sediment cleaning suction passage;
(2) The method comprises the steps that water inlet pipes are arranged at intervals in the embedded curtain grouting pipes, low-pressure water flow is pressed into the bottom of an impervious wall groove through the water inlet pipes at the bottoms of the embedded curtain grouting pipes in the water inlet pipes, water absorption and air supply pipes are arranged between the two embedded curtain grouting pipes in the water inlet pipes, water absorption is carried out by the water absorption and air supply pipes, the bottom of the impervious wall groove is cleaned, and mud and fine rock particles are sucked out;
(3) After the cleaning is finished, the water inlet pipe is removed, a steel anchoring piece is placed in the pre-buried curtain grouting pipe, one part of the steel anchoring piece is positioned in the pre-buried curtain grouting pipe, and the other part of the steel anchoring piece extends out of the lower end of the pre-buried curtain grouting pipe;
(4) Placing a grouting pipe in the pre-buried curtain grouting pipe, grouting cement mortar or cement thick slurry into the bottom of the impervious wall through the grouting pipe, and simultaneously pressing low-pressure air into the water-absorbing and air-supplying pipe to ensure that slurry and large-particle sediments at the bottom of the impervious wall are uniformly mixed;
(5) And after the cement slurry backfilled at the bottom of the tank is finally solidified, grouting cement curtain at the bottom of the impervious wall according to a common construction procedure.
2. The method for treating the sediment at the bottom of the diaphragm wall of the soft rock foundation as claimed in claim 1, wherein after the step (1), the sediment condition at the bottom of the diaphragm wall is determined by photographing in a hole of a curtain grouting hole, if the sediment thickness is small and the sediment is not communicated, curtain grouting can be directly carried out according to a common construction procedure, and if the sediment thickness at the bottom of the diaphragm wall is large, a continuous seepage channel is formed, the step (2) is shifted.
3. The soft rock foundation diaphragm wall groove bottom sediment treatment method according to claim 1, wherein curtain grouting pipes are arranged along the length direction of the diaphragm wall, the aperture phi is 100-110 mm, and the distance is 1-2 m.
4. The method for treating soft rock foundation anti-seepage wall groove bottom sediment according to claim 1, wherein the diameter phi of the steel pipe is 90mm, the bottom side wall of the steel pipe is provided with holes, and the diameter phi of the holes is 75mm.
5. The soft rock foundation diaphragm wall groove bottom sediment treatment method according to claim 1, wherein the diaphragm wall groove bottom is backfilled with cement mortar or cement thick paste, and a proper amount of accelerator can be added.
6. The method for treating sludge at the bottom of a soft rock foundation diaphragm wall according to claim 1, wherein after the cement slurry filled in the bottom of the diaphragm wall reaches 75% of the designed strength after final setting, cement curtain grouting at the bottom of the diaphragm wall is carried out according to the normal construction procedure.
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| CN201710967836.2A CN107747317B (en) | 2017-10-18 | 2017-10-18 | Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure |
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| CN201710967836.2A CN107747317B (en) | 2017-10-18 | 2017-10-18 | Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure |
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| CN109183868B (en) * | 2018-08-24 | 2020-12-08 | 黄河勘测规划设计研究院有限公司 | Method for treating dam foundation deep weathering capsule |
| CN109632577B (en) * | 2019-02-20 | 2021-07-16 | 自然资源部第一海洋研究所 | Impervious wall defect position detection device and detection method |
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| CN102817361B (en) * | 2012-09-10 | 2014-11-05 | 广东省水利水电第三工程局 | Double bushing top cover for broken rock curtain grouting and construction method of double bushing top cover |
| CN104652419B (en) * | 2015-01-20 | 2016-09-07 | 广东水电二局股份有限公司 | A kind of underground anti-seepage reserves the construction method of grout curtain pipe within the walls |
| CN104878723B (en) * | 2015-06-01 | 2016-11-23 | 南京明辉建设有限公司 | Soil stone mixed dam upper and lower disjunctor vertical seepage control structure and construction method |
| CN105155472B (en) * | 2015-10-09 | 2017-04-26 | 中国电建集团成都勘测设计研究院有限公司 | Dam foundation anti-seepage structure of deep overlying layer earth-rock dam and construction method of dam foundation anti-seepage structure |
| CN106246208B (en) * | 2016-08-11 | 2018-05-04 | 中国水利水电第十四工程局有限公司 | A kind of construction method of the naked rock grouting to waterproof of underground chamber |
| CN207538058U (en) * | 2017-10-18 | 2018-06-26 | 中国电建集团华东勘测设计研究院有限公司 | A kind of soft rock base cut-pff wall cell bottom structure |
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