CN210288408U - Foundation pit supporting structure - Google Patents

Foundation pit supporting structure Download PDF

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Publication number
CN210288408U
CN210288408U CN201920429900.6U CN201920429900U CN210288408U CN 210288408 U CN210288408 U CN 210288408U CN 201920429900 U CN201920429900 U CN 201920429900U CN 210288408 U CN210288408 U CN 210288408U
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CN
China
Prior art keywords
pile
foundation pit
jet grouting
anchor cable
pressure jet
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Expired - Fee Related
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CN201920429900.6U
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Chinese (zh)
Inventor
张子江
张俊杰
张丽红
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Ningbo Metallurgical Survey And Design Research Co ltd
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Ningbo Metallurgical Survey And Design Research Co ltd
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Priority to CN201920429900.6U priority Critical patent/CN210288408U/en
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Publication of CN210288408U publication Critical patent/CN210288408U/en
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Abstract

The utility model relates to a foundation ditch support technical field discloses a foundation ditch supporting structure, steel-pipe pile including interval arrangement, the interlock is equipped with high pressure jet grouting pile between the adjacent steel-pipe pile, steel-pipe pile and high pressure jet grouting pile top are connected through hat roof beam, one side that is located the steel-pipe pile and is close to the foundation ditch is equipped with cement mixing pile, one side that is located the steel-pipe pile and keeps away from the foundation ditch is equipped with thickness cement mixing wall such as TRD, the soil layer that foundation ditch one side was kept away from to thickness cement mixing wall such as hat roof beam and TRD passes through the taut connection of anchor rope one, one side that high pressure jet grouting pile is close to the foundation ditch is located hat roof beam below and is equipped with vertical structure, vertical structure supports in one side that high pressure jet grouting pile is close to the foundation ditch, the soil layer that. The utility model is suitable for the construction environment with complex geological conditions such as high water level, abundant underground water, silty soil and the like, and has good water-stopping effect, safety and reliability; and the high-pressure jet grouting pile can be limited, and the environmental pollution is reduced.

Description

Foundation pit supporting structure
Technical Field
The utility model relates to a foundation ditch support technical field especially relates to a foundation ditch supporting construction.
Background
With the rapid development of economy, particularly in coastal areas of China, the process of urbanization construction is increasingly accelerated. The coastal areas of China are relatively poor in land resources, the available land resources are less and less, the development of underground spaces is favored more and more in order to increase the living space of cities, and the coastal areas are mostly soft soil, so that a large number of problems of soft soil foundation pit supporting design are generated, and the problems become hot spots and difficulties of the current basic engineering.
Chinese patent No. CN204780941U discloses a foundation pit enclosure structure, which comprises a plurality of row piles arranged in sequence and arranged on one side of a foundation pit, wherein the row piles are inserted into a soil layer, and the top ends of the row piles are connected through a top connecting structure; the plurality of longitudinal structural members are arranged on one side, close to the foundation pit, of the row piles, each longitudinal structural member is connected with the plurality of row piles, a plurality of anchor cable fixing positions are arranged on each longitudinal structural member, and each anchor cable fixing position is located between every two adjacent row piles; a plurality of anchor cables of the rotary jet piles are arranged on one side of the row piles, which is far away from the foundation pit, and are inserted into the soil layer in an inclined mode; every spouts a anchor rope soon includes spouts a body soon, spouts this internal anchor rope body that is equipped with of stake soon, and the one end of anchor rope body is passed through fixed connection piece and is connected with anchor rope fixed position.
The row pile generally adopts the bored concrete pile as foundation ditch support, and envelope is comparatively firm, but the stagnant water effect is relatively poor. Under the construction environments with complex geological conditions such as high water level, abundant underground water, silt and the like, the water stopping function is not provided, and the construction requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's shortcoming, a foundation ditch supporting construction is provided.
In order to solve the technical problem, the utility model discloses a following technical scheme can solve:
the utility model provides a foundation pit supporting structure, including locating a plurality of steel-pipe piles that the straight line interval was arranged in proper order in one side of foundation ditch, be equipped with high-pressure jet grouting pile between the adjacent steel-pipe pile, high-pressure jet grouting pile and the mutual interlock of adjacent steel-pipe pile, steel-pipe pile and high-pressure jet grouting pile top parallel and level are connected through the guan liang, one side that is located the steel-pipe pile and is close to the foundation ditch is equipped with cement mixing pile, cement mixing pile continuous arrangement forms stagnant water curtain, one side that is located the foundation ditch is kept away from to the pile is equipped with thickness cement mixing wall such as TRD, the guan liang is connected through the tensioning of anchor rope one with the soil layer that thickness cement mixing wall such as TRD kept away from foundation ditch one side, one side that high-pressure jet grouting pile is close to guanliang below is equipped with vertical structure, vertical structure supports in one side that high-.
Preferably, the first anchor cable is a recoverable rotary-spraying hole-expanding prestressed anchor cable, an anchoring section of the first anchor cable is fixed in a soil layer on one side, away from the foundation pit, of the TRD equal-thickness cement soil mixing wall, and a free section of the first anchor cable sequentially penetrates through the TRD equal-thickness cement soil mixing wall and the crown beam and then is fixed on the crown beam through a fixed connecting block; the upper side of one side of the crown beam close to the foundation pit is provided with an inclined plane for obliquely placing the fixed connecting block.
By adopting the scheme, the stress form of the row piles is improved, and the phenomenon that the whole supporting structure is overturned due to overlarge displacement of the top ends of the steel pipe piles and the high-pressure jet grouting piles under the horizontal force action of a soil body can be prevented; and the stability of the connection of the anchor cable I and the crown beam is improved, and the tops of the steel pipe pile and the high-pressure jet grouting pile can be fixed more firmly.
Preferably, the anchor cable II is a recoverable rotary-spraying hole-expanding prestressed anchor cable, an anchoring section of the anchor cable II is fixed in a soil layer on one side, away from the foundation pit, of the TRD equal-thickness cement soil mixing wall, and a free section of the anchor cable II sequentially penetrates through the TRD equal-thickness cement soil mixing wall, the high-pressure rotary-spraying pile and the longitudinal structural member and then is fixedly connected with the longitudinal structural member.
By adopting the scheme, the stress form of the steel pipe pile and the high-pressure jet grouting pile is further improved, and the situation that the supporting structure is wholly overturned due to the fact that the top ends of the steel pipe pile and the high-pressure jet grouting pile are excessively displaced under the horizontal force action of a soil body can be prevented.
Preferably, the anchor cable I and the anchor cable II are arranged at intervals in the horizontal direction.
By adopting the scheme, the stress form of the steel pipe pile and the high-pressure jet grouting pile is further improved, so that the supporting acting force formed by the anchor cable I and the anchor cable II on the steel pipe pile and the high-pressure jet grouting pile is more uniform, and the stability of the supporting structure is improved.
Preferably, if the stress-intervening pipe piles are inserted into the TRD equal-thickness cement soil stirring wall at intervals, the prestress pipe piles are arranged corresponding to the steel pipe piles.
By adopting the scheme, the rigidity of the TRD equal-thickness cement-soil mixing wall is improved.
Preferably, a plurality of H-shaped steels are inserted into the TRD equal-thickness cement soil mixing wall at intervals, and the H-shaped steels correspond to the steel pipe piles.
By adopting the scheme, the bending resistance and the shearing resistance of the TRD equal-thickness cement-soil mixing wall are improved, the H-shaped steel can be dismantled and recycled under the condition that the design meets the requirements, and the cost is reduced.
The utility model discloses owing to adopted above technical scheme, have apparent technological effect: the steel pipe piles and the high-pressure jet grouting piles are arranged to be meshed at intervals, cement soil mixing piles and TRD (blast furnace Top-pressure recovery device) equal-thickness cement soil mixing walls are arranged on one side, close to the foundation pit, of the steel pipe piles and one side, far away from the foundation pit, of the steel pipe piles respectively, the steel pipe piles and the high-pressure jet grouting piles are reinforced through anchor cables I and anchor cables II, the steel pipe piles and the high-pressure jet grouting piles are suitable for construction environments with complex geological conditions such as high water level, abundant underground water and silt; the high-pressure jet grouting pile can be limited to a certain extent, and the environmental pollution of cement paste sprayed out of the high-pressure jet grouting pile to the surrounding is avoided to the maximum extent.
Drawings
Fig. 1 is a schematic longitudinal structural view of an excavation supporting structure according to example 1;
fig. 2 is a schematic lateral structural view of an excavation supporting structure according to example 1;
fig. 3 is a schematic longitudinal structural view of an excavation supporting structure according to example 2;
fig. 4 is a schematic lateral structure of an excavation supporting structure according to example 2;
fig. 5 is a schematic longitudinal structural view of an excavation supporting structure according to embodiment 3.
The names of the parts indicated by the numerical references in the above figures are as follows: 1. steel pipe piles; 2. high-pressure jet grouting piles; 3. a crown beam; 31. a bevel; 4. mixing the cement soil with the pile; 5. TRD equal thickness cement mixing wall; 6. an anchor cable I; 7. fixing a connecting block; 8. a longitudinal structural member; 9. anchor cable II; 10. pre-stressing pipe piles; 11. h-shaped steel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1 and 2, a foundation pit support structure, including set up in a plurality of even interval linear arrangement's in proper order steel-pipe pile 1 of foundation pit A1 one side, the diameter of steel-pipe pile 1 is 600mm, center between the adjacent steel-pipe pile 1 is equipped with high-pressure jet grouting pile 2, the diameter of high-pressure jet grouting pile 2 is 1000mm and forms the inline arrangement structure that has the effect of earth retaining stagnant water with mutual interlock of steel-pipe pile 1, steel-pipe pile 1 and the top parallel and level of high-pressure jet grouting pile 2 are connected through hat roof beam 3. And a cement-soil mixing pile 4 is arranged on one side of the steel pipe pile 1 close to the foundation pit A1, the cement-soil mixing piles 4 adopt triaxial cement-soil mixing piles with the diameter of 850mm, the triaxial cement-soil mixing piles are continuously arranged to form a waterproof curtain, and when a pit is dug in the foundation pit A1, the part of the cement-soil mixing pile 4 above the foundation pit A1 can be dug along with the chisel. The TRD equal-thickness cement-soil mixing wall 5 is arranged on one side, far away from the foundation pit A1, of the steel pipe pile 1, the TRD equal-thickness cement-soil mixing wall 5 is continuous in wall forming, smooth in surface, consistent in thickness, good in wall uniformity, good in anti-seepage performance, small in caused environmental pollution and safe in construction, and the thickness of the TRD equal-thickness cement-soil mixing wall 5 is smaller than the diameter of the cement-soil mixing pile 4 and is 700 mm. The bottom end of the cement-soil mixing pile 4 is flush with the bottom end of the TRD equal-thickness cement-soil mixing wall 5, and the bottom end of the steel pipe pile 1 is deeper than the bottom end of the cement-soil mixing pile 4 and the bottom end of the TRD equal-thickness cement-soil mixing wall 5.
The soil layer of the side, far away from the foundation pit A1, of the equal-thickness cement mixing wall 5 of the TRD is connected in a tensioned mode through an anchor cable I6, the anchor cable I6 adopts a recoverable jet grouting hole-expanding prestressed anchor cable, the inclination angle of the anchor cable I6 is 20 degrees, the anchoring section of the anchor cable I6 is fixed in the soil layer of the side, far away from the foundation pit A1, of the equal-thickness cement mixing wall 5 of the TRD, the free section of the anchor cable I6 sequentially penetrates through the equal-thickness cement mixing wall 5 of the TRD and the crown beam 3 and then is fixed on the crown beam 3 through a fixed connecting block 7, and the upper side, close to the side of the foundation pit A1, of the crown beam.
One side of the high-pressure jet grouting pile 2 close to the foundation pit A1 is located below the crown beam 3, a plurality of anchor cable fixing positions are arranged on the longitudinal structural member 8 at intervals, the longitudinal structural member 8 is vertically arranged with the high-pressure jet grouting pile 2 by adopting profile steel and abuts against one side of the high-pressure jet grouting pile 2 close to the foundation pit A1, a soil layer of one side, far away from the foundation pit A1, of the cement-soil mixing wall 5 with the same thickness as the TRD is connected in a tensioned mode through an anchor cable II 9, the anchor cable II 9 is a recoverable jet grouting and chambering prestressed anchor cable, the inclination angle of the anchor cable II 9 is 20 degrees, an anchoring section of the anchor cable II 9 is fixed in a soil layer of one side, far away from the foundation pit A1, of the cement-soil mixing wall 5 with the same thickness as the TRD, a free section of the anchor cable II 9 sequentially penetrates through the cement-. The anchor cables I6 and the anchor cables II 9 are arranged at intervals in the horizontal direction.
Example 2
Referring to fig. 3 and 4, the difference between the embodiment and the first embodiment is that a plurality of prestressed pipe piles 10 are uniformly inserted into the equal-thickness cement-soil mixing wall 5 of the TRD at intervals, the prestressed pipe piles 10 are specifically prestressed concrete pipe Piles (PC), the rigidity of the equal-thickness cement-soil mixing wall 5 of the TRD can be effectively improved, and the prestressed pipe piles 10 correspond to the steel pipe piles 1 in sequence.
Example 3
Referring to fig. 5, the difference between the embodiment and the second embodiment is that a plurality of H-shaped steels 11 are inserted into a TRD equal-thickness cemented soil stirring wall 5 at uniform intervals to replace prestressed pipe piles 10, and the H-shaped steels 11 sequentially correspond to the steel pipe piles 1. After the basement structure construction of foundation ditch A1 is accomplished, carry out the closely knit backfill of layering, after retrieving the prestressing steel strand in anchor rope one 6 and the anchor rope two 9, alright carry out the foundation ditch excavation in order to carry out the A2 region, after the construction of the regional foundation ditch of A2 is accomplished, under the condition that steel-pipe pile 1, high pressure jet grouting pile 2 and soil cement mixing pile 4 satisfy the design requirement, can also pull out H shaped steel 11 in the soil cement mixing wall 5 of thickness such as TRD and retrieve and recycle, have more economic nature.

Claims (6)

1. The utility model provides a foundation ditch supporting construction which characterized in that: the high-pressure jet grouting pile structure comprises a plurality of steel pipe piles (1) which are sequentially arranged along a straight line at intervals on one side of a foundation pit, a high-pressure jet grouting pile (2) is arranged between every two adjacent steel pipe piles (1), the high-pressure jet grouting pile (2) is mutually occluded with the adjacent steel pipe piles (1), the top ends of the steel pipe piles (1) and the high-pressure jet grouting pile (2) are parallel and level and are connected through crown beams (3), one side, close to the foundation pit, of each steel pipe pile (1) is provided with a cement soil stirring pile (4), the cement soil stirring piles (4) are continuously arranged to form a waterproof curtain, one side, far away from the foundation pit, of each steel pipe pile (1) is provided with a TRD equal-thickness cement soil stirring wall (5), the crown beams (3) and the TRD equal-thickness cement soil stirring wall (5) are connected in a tensioned mode through anchor cables (6), one side, close to the foundation pit, of each high-pressure jet grouting pile (2) is positioned below the crown, and the longitudinal structural member (8) is connected with a soil layer on one side, far away from the foundation pit, of the TRD equal-thickness cement soil mixing wall (5) in a tensioning mode through a second anchor cable (9).
2. A foundation pit supporting construction according to claim 1, wherein: the anchor cable I (6) adopts a recoverable rotary-spraying hole-expanding prestressed anchor cable, the anchoring section of the anchor cable I (6) is fixed in a soil layer on one side, away from the foundation pit, of the TRD equal-thickness cement soil mixing wall (5), and the free section of the anchor cable I (6) sequentially penetrates through the TRD equal-thickness cement soil mixing wall (5) and the crown beam (3) and then is fixed on the crown beam (3) through a fixed connecting block (7); an inclined plane (31) used for obliquely placing the fixed connecting block (7) is arranged on the upper side of one surface, close to the foundation pit, of the top beam (3).
3. A foundation pit supporting construction according to claim 1, wherein: and the anchor cable II (9) adopts a recoverable jet grouting chambering prestressed anchor cable, the anchoring section of the anchor cable II (9) is fixed in the soil layer on one side, away from the foundation pit, of the TRD equal-thickness cement soil mixing wall (5), and the free section of the anchor cable II (9) sequentially penetrates through the TRD equal-thickness cement soil mixing wall (5), the high-pressure jet grouting pile (2) and the longitudinal structural member (8) and then is fixedly connected with the longitudinal structural member (8).
4. A foundation pit supporting construction according to claim 1, wherein: the anchor cable I (6) and the anchor cable II (9) are arranged at intervals in the horizontal direction.
5. A foundation pit supporting construction according to claim 1, wherein: if the stress-affected tubular piles (10) are inserted into the TRD equal-thickness cement soil stirring wall (5) at intervals, the pre-stressed tubular piles (10) are arranged corresponding to the steel pipe piles (1).
6. A foundation pit supporting construction according to claim 1, wherein: a plurality of H-shaped steel (11) are inserted into the TRD equal-thickness cement soil mixing wall (5) at intervals, and the H-shaped steel (11) is arranged corresponding to the steel pipe pile (1).
CN201920429900.6U 2019-04-01 2019-04-01 Foundation pit supporting structure Expired - Fee Related CN210288408U (en)

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Application Number Priority Date Filing Date Title
CN201920429900.6U CN210288408U (en) 2019-04-01 2019-04-01 Foundation pit supporting structure

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Application Number Priority Date Filing Date Title
CN201920429900.6U CN210288408U (en) 2019-04-01 2019-04-01 Foundation pit supporting structure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059090A (en) * 2022-06-29 2022-09-16 浙江大学 Micro-disturbance combined foundation pit supporting wall and construction method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059090A (en) * 2022-06-29 2022-09-16 浙江大学 Micro-disturbance combined foundation pit supporting wall and construction method thereof

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Granted publication date: 20200410

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