CN114718083A - Construction method of foundation pit support anti-seepage composite structure of highly permeable layer foundation - Google Patents
Construction method of foundation pit support anti-seepage composite structure of highly permeable layer foundation Download PDFInfo
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- CN114718083A CN114718083A CN202210366661.0A CN202210366661A CN114718083A CN 114718083 A CN114718083 A CN 114718083A CN 202210366661 A CN202210366661 A CN 202210366661A CN 114718083 A CN114718083 A CN 114718083A
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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
- E02D17/04—Bordering surfacing or stiffening the sides of 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/08—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with digging wheels turning round an axis
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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
Abstract
The invention discloses a construction method of a foundation pit supporting anti-seepage composite structure of a highly permeable layer, which comprises the following steps of firstly constructing a double-wheel milling cement soil anti-seepage wall, and inserting I-shaped steel into the double-wheel milling cement soil anti-seepage wall to form a composite vertical supporting structure; then, a first ring beam is poured and constructed at the top of the double-wheel milling cement soil impervious wall, a first layer of horizontal support is arranged on the first ring beam, then a foundation pit is excavated, a next ring beam is constructed on the inner wall of the double-wheel milling cement soil impervious wall at intervals of a certain depth in the excavation process of the foundation pit, and horizontal supports are arranged on each ring beam; vertical connecting beams are constructed between the upper ring beam and the lower ring beam which are adjacent; after the foundation pit is excavated to the bottom of the foundation pit, a foundation pit floor is poured, a vertical supporting beam is constructed between the foundation pit floor and the last ring beam, and then basement construction is carried out; and removing the horizontal supports of all layers from bottom to top step by step according to the construction progress of the underground structure. The method can effectively support the foundation pit of the highly permeable layer foundation, and ensures the safety of the construction process of excavating the foundation pit and the underground structure.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting, and particularly relates to a construction method of a foundation pit supporting anti-seepage composite structure of a highly permeable layer foundation.
Background
The foundation pit supporting structure system generally comprises two parts, namely a soil retaining structure and a precipitation and water stopping system. Pile and wall type supporting structures often adopt steel sheet piles, reinforced concrete sheet piles, column type cast-in-place piles, underground continuous walls and the like. According to the soil condition and the size of the foundation pit, the foundation pit can be designed to be cantilever type, inner support type or anchor type. The gravity type supporting structure mostly adopts a cement soil mixing pile retaining wall, a soil nailing wall and the like. When the supporting structure can not play the role of water stop, a water stop curtain can be arranged or precipitation outside the pit is adopted at the same time so as to achieve the purpose of controlling underground water, so that the foundation pit earthwork engineering can be excavated under the dry operation condition.
Although the sheet pile type supporting structure can be suitable for various stratums, the pile and wall type supporting structures adopted in the highly permeable stratums have very high process requirements, and the construction effect of the seepage-proofing and water-stopping curtain needs to be enhanced, so that the construction cost is increased sharply. The underground continuous wall supporting system can be used for a foundation pit supporting structure of a strongly permeable stratum, but the construction cost is very high for a foundation pit of which the supporting structure is only temporarily supported, and the construction investment is not favorably controlled. Cement mixing pile retaining wall, high pressure jet grouting pile retaining wall and other gravity type retaining walls. The wall body mainly bears pressure, generally does not bear pulling force, and when the soil property condition is relatively poor, the excavation depth of the foundation pit should not be too large, and the foundation pit is suitable for small foundation pit engineering. When the soil quality condition is better, the cement soil stirring process is limited in use.
The technology of double-wheel milling deep mixing wall is a novel construction method, and double-wheel milling deep mixing equipment comprises two types: the guide rod type double-wheel milling deep layer stirring equipment can achieve a cutting and stirring depth of 45m, and the suspension type double-wheel milling deep layer stirring equipment can achieve a cutting and stirring depth of 65 m.
The double-wheel milling deep-layer stirring impervious wall is formed by combining the technical characteristics of a hydraulic double-wheel slot milling machine and the traditional deep-layer stirring, and in the processes of tunneling grouting, air supply, milling, cutting and stirring, the two milling wheels oppositely rotate to mill a stratum; meanwhile, downward propelling force is applied through the Kaiser square guide rod, and downward tunneling and cutting are carried out. In the process, high-pressure gas and slurry are respectively injected into the groove through a gas supply and grouting system until the required design depth is reached. And then, the two milling wheels rotate oppositely in opposite directions, the milling wheels are lifted upwards slowly through the Kai's square guide rod, gas and curing liquid are respectively injected into the groove through a gas supply and grouting pipeline system and are mixed with the foundation soil in the groove, and therefore an impermeable body formed by the foundation soil, a curing agent, water, an additive and the like is formed.
For the high-water-head foundation pit support of the highly permeable stratum, the supporting structures of the sheet pile, the cement soil mixing pile, the underground continuous wall and the gravity type cement soil wall have different defects. The double-wheel milling deep cement mixing earth wall and I-steel composite supporting seepage-proofing structure can achieve the double purposes of supporting and water stopping, can well save cost and shorten the construction period, and is a low-carbon and environment-friendly composite supporting structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method of a foundation pit supporting anti-seepage composite structure of a strong permeable layer foundation.
The invention is realized by the following technical scheme:
a construction method of a foundation pit supporting anti-seepage composite structure of a highly permeable layer foundation comprises the following steps:
step 1, constructing a double-wheel milling cemented soil impervious wall around a foundation pit to be excavated;
step 3, after the construction of the double-wheel milling cement-soil impervious wall and the I-steel is finished, pouring a first ring beam at the top of the double-wheel milling cement-soil impervious wall around the constructed double-wheel milling cement-soil impervious wall, wherein the top of the I-steel exceeds the first ring beam; the first ring beam is made of reinforced concrete, and the inner side of the first ring beam exceeds the inner side of the double-wheel milling cement soil impervious wall;
step 4, arranging a first layer of horizontal supports on the first ring beam at equal intervals along the length direction of the first ring beam, wherein each horizontal support is horizontally arranged between two opposite long-edge beam bodies of the first ring beam to play a supporting role; then excavating a foundation pit;
step 5, constructing a next ring beam on the inner wall of the double-wheel milling cement-soil impervious wall at intervals of a certain depth in the excavation process of the foundation pit, and arranging horizontal supports on each ring beam at equal intervals along the length direction of the ring beam; vertical connecting beams are constructed between the upper ring beam and the lower ring beam which are adjacent;
and 7: and removing the horizontal supports of all layers from bottom to top step by step according to the construction progress of the underground structure.
In the technical scheme, when the double-wheel milling cemented soil impervious wall is constructed, firstly, the double-wheel milling cemented soil impervious wall is divided into a plurality of groove sections around a foundation pit to be excavated, the groove sections are numbered in sequence, and a reciprocating construction process is adopted to construct each groove section.
In the technical scheme, the length of the I-shaped steel is preferably 20-30m, and two I-shaped steels are preferably inserted into each double-wheel milling cemented soil impervious wall groove section at intervals.
In the technical scheme, the first ring beam is made of reinforced concrete, the section of the first ring beam is rectangular, and the section has the height of 80cm and the width of 120 cm.
In the technical scheme, the ring beam constructed on the inner wall of the double-wheel milling cement-soil impervious wall is a reinforced concrete beam, and the reinforcing steel bars of the ring beam are driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the ring beam and the inner wall of the double-wheel milling cement-soil impervious wall is increased.
In the technical scheme, the vertical connecting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, the vertical connecting beam is made of reinforced concrete, and the reinforcing steel bars of the vertical connecting beam are driven into the double-wheel milling cement-soil impervious wall.
In the technical scheme, the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, the vertical supporting beam is made of reinforced concrete, and reinforcing steel bars of the vertical supporting beam are driven into the double-wheel milling cement-soil impervious wall.
In the technical scheme, the horizontal supports can be made of reinforced concrete materials or steel pipes, and the distance between every two adjacent horizontal supports on each layer is preferably 8-10 m.
In the technical scheme, preferably, the ring beam is constructed at the vertical interval of 5-6m in depth.
In the technical scheme, the I-shaped steel is pulled out one by using the jack after the construction of the underground structure is finished.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the cutter of the double-wheel milling head is made of alloy materials and diamonds, a proper cutter can be selected according to different geological stratum conditions, the double-wheel milling head can dig a soil layer, a sand layer, a gravel layer and a weathered rock layer, and the field adaptability is strong.
(2) The double-wheel deep stirring milling head for milling comprises a plurality of rows of cutters, soil is cut by the high-speed rotation of the milling wheel, and high-pressure air is injected in the cutting process, so that the double-wheel deep stirring milling head has excellent stirring and mixing performance, can realize the whole wall body lap joint, and has a very good anti-seepage effect.
(3) A double-wheel milling deep stirring and I-steel composite vertical supporting structure belongs to a semi-rigid supporting structure, is applicable to various stratums and cannot be damaged by brittle fracture.
(4) I-shaped steel in the double-wheel milling deep stirring and I-shaped steel composite vertical supporting structure can be recycled after the construction of an underground structure is finished, so that the engineering investment is saved, and the double-wheel milling deep stirring and I-shaped steel composite vertical supporting structure is a low-carbon environment-friendly foundation pit supporting structure.
(5) According to the invention, a plurality of ring beams are constructed on the basis of the double-wheel milling cement-soil impervious wall, vertical connection and supporting beams are arranged among the ring beams, and horizontal supports are arranged on each ring beam at equal intervals along the length direction of the ring beam. The composite support structure is stable, can effectively support the foundation pit of the foundation with the strong permeable layer, and ensures the safety of the construction process of excavating the foundation pit and the underground structure.
Drawings
Fig. 1 is a top view of a highly permeable layer foundation pit support impermeable composite structure.
Fig. 2 is a sectional view of the permeable and strongly permeable layer foundation pit supporting impermeable composite structure shown in fig. 1 in the direction of a.
Fig. 3 is a B-direction sectional view of the impermeable composite structure of the foundation pit support of the highly permeable foundation shown in fig. 1.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
In this embodiment, a construction method of the impermeable composite structure for foundation pit support of a highly permeable foundation is described by taking a certain building site stratum as an example. The ground layer of a certain building site comprises sand, pebble gravel, fully weathered rock, strongly weathered rock, stroke rock, breezy rock and unsprung rock from top to bottom, the underground water level is 3m below the ground, the building requirements are that the excavation depth of a foundation pit is 20m, the foundation pit is rectangular, and the size of the foundation pit is 200m x 20 m.
The construction method of the impermeable composite structure for the foundation pit support of the highly permeable layer foundation comprises the following specific steps:
leveling a building structure field, and removing earth surface vegetation and construction waste.
And step two, positioning double-wheel milling equipment, and testing piles according to the soil property of the stratum to determine construction parameters such as cement mixing amount, stirring speed and the like.
Thirdly, dividing the double-wheel milling cement soil impervious wall into a plurality of groove sections according to the shape and the size of a foundation pit to be excavated (the foundation pit in the embodiment is rectangular, and the size is 200m x 20m), numbering the groove sections 1,2,3,4 and 5 … in sequence, and adopting a reciprocating construction process, namely constructing the groove sections 1, 3 and 5 first, and then constructing the groove sections … … 2, 4 and 6, wherein the interval time between the sequence I and the sequence II is less than or equal to 12 h; the length of each groove section is 2800mm, and the lap joint length is not less than 300 mm; the wall body of the double-wheel milling cemented soil impervious wall is 100cm in thickness, and the depth of the wall body is 1m when the wall body enters the strongly weathered rock.
And step four, after the construction of each double-wheel milling cemented soil impervious wall groove section is finished, vertically inserting two I-beams 2 with the length of 23m into the double-wheel milling cemented soil impervious wall, preferably inserting two I-beams into each double-wheel milling cemented soil impervious wall groove section, wherein the interval between the two I-beams is 1250mm, and coating a lubricant or a plastic film on the surfaces of the I-beams.
Step five, after all the double-wheel milling cemented soil impervious wall and the I-beam are constructed, pouring and constructing a first ring beam 3.1 at the top of the double-wheel milling cemented soil impervious wall around the constructed rectangular double-wheel milling cemented soil impervious wall 1, wherein the top of the I-beam 2 is beyond the first ring beam; the first ring beam 3.1 is made of reinforced concrete, the cross section is rectangular, the size of the cross section is 80cm in height and 120cm in width, namely, the inner side of the first ring beam 3.1 exceeds the inner side of the double-wheel milling cement-soil impervious wall 1 by 20 cm.
And sixthly, after the cement-soil cut-off wall and the first ring beam are milled in a double-wheel mode, arranging first horizontal supports 4.1 on the rectangular first ring beam 3.1 at equal intervals along the length direction of the first ring beam, wherein the distance between every two adjacent horizontal supports is preferably 10m, each horizontal support is horizontally arranged between two opposite long-edge beam bodies of the rectangular first ring beam, namely two ends of each horizontal support are respectively connected to the two opposite long-edge beam bodies of the rectangular first ring beam, and the support effect is achieved.
And seventhly, excavating a foundation pit after the first layer of horizontal support is constructed.
Step eight, when the foundation pit is excavated to 5m deep, constructing a second ring beam 3.2 on the inner wall of the double-wheel milled cemented soil impervious wall at the position of 5m deep around the rectangular double-wheel milled cemented soil impervious wall 1, wherein the second ring beam 3.2 is a reinforced concrete beam, the reinforcing steel bars are driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the second ring beam 3.2 and the inner wall of the double-wheel milling cement-soil impervious wall is increased, and in addition, in order to prevent the second ring beam 3.2 from falling off, a vertical connecting beam 5.1 is also required to be constructed between the second ring beam 3.2 and the part of the first ring beam 3.1, which exceeds the inner side of the double-wheel milling cement impervious wall, a second ring beam 3.2 is hung through the vertical connecting beams, the cross section size of each vertical connecting beam is 30cm to 20cm, the number of the vertical connecting beams is multiple, the vertical connecting beams are arranged at intervals of 10m, the vertical connecting beams are tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, and preferably, reinforcing steel bars of the vertical connecting beams are also driven into the double-wheel milling cement-soil impervious wall; a second layer of horizontal supports 4.2 is then arranged on the second ring beam 3.2 at equal intervals along its length.
Step nine, when the foundation pit is excavated to the depth of 10m, a third ring beam 3.3 is constructed on the inner wall of the double-wheel milling cemented soil impervious wall around the rectangular double-wheel milling cemented soil impervious wall 1 at the position of 10m, the third ring beam 3.3 is a reinforced concrete beam, and reinforcing steel of the third ring beam is driven into the double-wheel milling cemented soil impervious wall, so that the connection strength between the third ring beam 3.3 and the inner wall of the double-wheel milling cemented soil impervious wall is increased, and in addition, in order to prevent the third ring beam 3.3 from falling off, a vertical connecting beam 5.2 is also required to be constructed between the third ring beam 3.3 and the second ring beam 3.2; a third layer of horizontal supports 4.3 is then arranged on the third ring beam 3.3 at equal intervals along its length.
Step ten, when the foundation pit is excavated to the depth of 15m, a fourth ring beam 3.4 is constructed on the inner wall of the double-wheel milling cement-soil impervious wall at the position of 10m around the rectangular double-wheel milling cement-soil impervious wall 1, the fourth ring beam 3.4 is a reinforced concrete beam, and reinforcing steel of the fourth ring beam is driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the fourth ring beam 3.4 and the inner wall of the double-wheel milling cement-soil impervious wall is increased, and in addition, in order to prevent the fourth ring beam 3.4 from falling off, a vertical connecting beam 5.3 is also required to be constructed between the fourth ring beam 3.4 and the third ring beam 3.3; a fourth layer of horizontal supports 4.4 is then arranged on the fourth ring beam 3.4 at equal intervals along its length.
Step eleven, excavating to the bottom of a foundation pit, pouring a foundation pit floor 6, and constructing a vertical supporting beam 5.4 between the foundation pit floor 6 and a fourth ring beam 3.4 (the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, preferably, reinforcing steel bars of the vertical supporting beam are also driven into the double-wheel milling cement-soil impervious wall); and then basement construction is carried out.
And step twelve, dismantling each layer of horizontal support from bottom to top step by step according to the construction progress of the underground structure.
And step thirteen, after the underground structure is constructed, the I-beams are pulled out one by using the jacks, and the I-beams can be recycled.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A construction method of a foundation pit supporting anti-seepage composite structure of a highly permeable layer is characterized by comprising the following steps:
step 1, constructing a double-wheel milling cemented soil impervious wall around a foundation pit to be excavated;
step 2, inserting I-shaped steel into the double-wheel milling cemented soil impervious wall at equal intervals to form a composite vertical supporting structure;
step 3, after the construction of the double-wheel milling cement-soil impervious wall and the I-steel is finished, pouring a first ring beam at the top of the double-wheel milling cement-soil impervious wall around the constructed double-wheel milling cement-soil impervious wall, wherein the top of the I-steel exceeds the first ring beam; the first ring beam is made of reinforced concrete, and the inner side of the first ring beam exceeds the inner side of the double-wheel milled cement soil impervious wall;
step 4, arranging a first layer of horizontal supports on the first ring beam at equal intervals along the length direction of the first ring beam, wherein each horizontal support is horizontally arranged between two opposite long-edge beam bodies of the first ring beam to play a supporting role; then excavating a foundation pit;
step 5, constructing a next ring beam on the inner wall of the double-wheel milling cement-soil impervious wall at intervals of a certain depth in the excavation process of the foundation pit, and arranging horizontal supports on each ring beam at equal intervals along the length direction of the ring beam; vertical connecting beams are constructed between the upper ring beam and the lower ring beam which are adjacent;
step 6, after the foundation pit is excavated to the bottom of the foundation pit, a foundation pit floor is poured, a vertical supporting beam is constructed between the foundation pit floor and the last ring beam above the foundation pit floor, and then basement construction is carried out;
and 7: and removing the horizontal supports of all layers from bottom to top step by step according to the construction progress of the underground structure.
2. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: when the double-wheel milling cemented soil impervious wall is constructed, firstly, the double-wheel milling cemented soil impervious wall is divided into a plurality of groove sections around a foundation pit to be excavated, the groove sections are numbered in sequence, and a reciprocating construction process is adopted to construct each groove section.
3. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 2, characterized in that: two I-shaped steel bars are inserted into each double-wheel milling cemented soil impervious wall groove section at intervals.
4. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: the first ring beam is made of reinforced concrete.
5. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: the ring beam constructed on the inner wall of the double-wheel milling cement-soil impervious wall is a reinforced concrete beam, and the reinforcing steel bars of the ring beam are driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the ring beam and the inner wall of the double-wheel milling cement-soil impervious wall is increased.
6. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: the vertical connecting beam is tightly attached to the inner wall of the double-wheel milling cement soil impervious wall, the vertical connecting beam is made of reinforced concrete, and reinforcing steel bars of the vertical connecting beam are to be driven into the double-wheel milling cement soil impervious wall.
7. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cemented soil impervious wall, the vertical supporting beam is made of reinforced concrete, and reinforcing steel bars of the vertical supporting beam are required to be driven into the double-wheel milling cemented soil impervious wall.
8. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: the horizontal supports can be made of reinforced concrete materials or steel pipes, and the distance between every two adjacent horizontal supports on each layer is 8-10 m.
9. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: and vertically separating by 5-6m to construct a ring beam.
10. The construction method of the permeable stratum foundation pit supporting anti-seepage composite structure according to claim 1, characterized in that: and after the construction of the underground structure is finished, the I-shaped steel is pulled out one by using the jack.
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| CN202210366661.0A CN114718083A (en) | 2022-04-08 | 2022-04-08 | Construction method of foundation pit support anti-seepage composite structure of highly permeable layer foundation |
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2022
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| CN103590425A (en) * | 2013-11-28 | 2014-02-19 | 中铁二十局集团第五工程有限公司 | Peaty soft soil stratum subway station construction technology |
| CN104612162A (en) * | 2014-12-15 | 2015-05-13 | 中铁二十局集团第三工程有限公司 | Subway station deep foundation pit excavation construction method |
| CN109403333A (en) * | 2018-11-02 | 2019-03-01 | 福建工程学院 | A kind of soft lower hard water rich strata deep basal pit reversed construction method |
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