CN113684832A - Construction structure and construction method for deep and shallow foundation pit - Google Patents

Construction structure and construction method for deep and shallow foundation pit Download PDF

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Publication number
CN113684832A
CN113684832A CN202110985666.7A CN202110985666A CN113684832A CN 113684832 A CN113684832 A CN 113684832A CN 202110985666 A CN202110985666 A CN 202110985666A CN 113684832 A CN113684832 A CN 113684832A
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China
Prior art keywords
foundation pit
deep
shallow
rubber band
construction
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CN202110985666.7A
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Chinese (zh)
Inventor
陈赛菊
刘玉涛
赵树山
王左同
赵宗元
吴硕军
肖培磊
陈永伟
王佳玉
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Zhongtian Construction Group Co Ltd
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Zhongtian Construction Group Co Ltd
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Priority to CN202110985666.7A priority Critical patent/CN113684832A/en
Publication of CN113684832A publication Critical patent/CN113684832A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron
    • E02D2300/0032Steel; Iron in sheet form, i.e. bent or deformed plate-material

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Foundations (AREA)

Abstract

The invention discloses a deep and shallow foundation pit construction structure which comprises a deep foundation pit and a shallow foundation pit, wherein a supporting pile is arranged between the deep foundation pit and the shallow foundation pit, a crown beam is fixedly arranged at the top of the supporting pile, the crown beam is of an annular structure arranged around the deep foundation pit, an armpit beam is arranged on the side face of the crown beam positioned on one side of the shallow foundation pit, the longitudinal section of the armpit beam is of an inverted trapezoidal structure, and the armpit beam is used for tying the crown beam. According to the invention, the haunch beam is additionally arranged on the outer side of the crown beam, so that the stability of the support pile is effectively improved, the bearing capacity of the support pile is greatly improved, the construction requirement of firstly excavating a shallow foundation pit and then excavating a deep foundation pit can be met, and the construction efficiency and the safety are greatly improved. The first upper rubber band, the second upper rubber band and the lower rubber band ensure that the bottom plate, the haunched beam and the crown beam are firmly connected, so that the construction structure is further reinforced, the bearing capacity of the construction structure is effectively improved, and the method is simple and easy to operate and low in cost.

Description

Construction structure and construction method for deep and shallow foundation pit
Technical Field
The invention belongs to the field of building construction, and relates to a deep and shallow foundation pit, in particular to a deep and shallow foundation pit construction structure and a construction method.
Background
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. The foundation pit can be divided into a deep foundation pit and a shallow foundation pit according to the excavation depth, namely the deep foundation pit and the shallow foundation pit.
In the prior art, slope protection of deep and shallow foundation pit construction is performed by constructing and driving a support pile, and a conventional construction method is to excavate a deep foundation pit first and then excavate a shallow foundation pit. For example, when the underground first floor and the underground second floor of the ground reservoir structure are adjacent, the underground second floor is constructed first, and then the underground first floor is constructed.
However, because the construction period is shortened, the situation that a shallow foundation pit needs to be excavated first and then a deep foundation pit needs to be excavated is often encountered in actual construction, but the bearing strength of the support pile is difficult to meet the design requirement, so that the collapse of a construction site is easily caused, and great potential safety hazards exist.
Disclosure of Invention
The invention provides a construction structure and a construction method of a deep and shallow foundation pit, which aim to solve the problems in the prior art.
The invention provides a deep and shallow foundation pit construction structure which comprises a deep foundation pit and a shallow foundation pit, wherein a supporting pile is arranged between the deep foundation pit and the shallow foundation pit.
Further, a foundation slab is laid at the bottom of the shallow foundation pit; a plurality of bottom plate steel bars are embedded in the foundation bottom plate and are arranged in parallel at intervals;
a first upper rubber band, a second upper rubber band and a lower rubber band are embedded in the haunch beam, the first upper rubber band is of an L-shaped structure, and one end of the first upper rubber band is embedded in the foundation bottom plate; the second upper rubber band is of an L-shaped structure, and one end part of the second upper rubber band is bound with the steel bar of the crown beam; the lower rubber band comprises an inclined section and a horizontal section, the end part of the horizontal section of the lower rubber band is bound with the steel bar in the crown beam, and the end part of the inclined section of the lower rubber band is embedded in the foundation slab.
Furthermore, a plain concrete reinforcing structure is arranged between the deep foundation pit and the support piles.
Further, waterproof layers are coated on the surfaces of the bottom plate, the haunched beam and the crown beam, and a sealing paste layer is coated on the surface of the waterproof layer of the crown beam.
The construction method of the deep and shallow foundation pit construction structure comprises the following steps:
the method comprises the following steps: excavating a shallow foundation pit;
step two: constructing a support pile at the position of the pre-constructed deep foundation pit;
step three: excavating earthwork on one side of the support pile, which is far away from the construction position of the deep foundation pit, to form a groove for placing the haunched beam;
step four: binding reinforcing steel bars of the haunched beam in the groove, and binding reinforcing steel bars of the crown beam at the top end of the support pile;
step five: pouring concrete to form an armpit beam, a crown beam and a bottom plate;
step six: and (5) excavating a deep foundation pit.
Furthermore, in the third step, the earthwork of the support pile, which is far away from one side of the deep foundation pit construction position within 1 meter, is excavated, and the surface of the excavated part, which is opposite to the support pile, is an inclined surface with a slope coefficient of 1: 1.
Further, in the fifth step, waterproof layers are coated on the surfaces of the poured haunched beam, the crown beam and the bottom plate, and a waterproof layer is coated on the surface of the waterproof layer of the crown beam.
Further, in the fifth step, the haunched beam, the crown beam and the bottom plate are formed in a one-step pouring mode.
Further, in the fifth step, the haunched beam, the crown beam and the bottom plate are respectively and sequentially poured, and water stop steel plates are embedded at the connecting positions inside the haunched beam, the crown beam and the bottom plate.
Further, in the sixth step, after the deep foundation pit is excavated, a plain concrete reinforcing structure is poured on the cushion layer between the deep foundation pit and the support piles.
The invention has the advantages and positive effects that:
1. according to the construction structure and the construction method of the deep and shallow foundation pit, the haunch beam is additionally arranged on the outer side of the crown beam, so that the stability of the support pile is effectively improved, the bearing capacity of the support pile is greatly improved, the construction requirement of firstly excavating the shallow foundation pit and then excavating the deep foundation pit can be met, and the construction efficiency and the safety are greatly improved. In the prior art, the supporting pile is supported only by the part buried underground, and compared with the prior art, the deep and shallow foundation pit construction structure has stronger protection capability on the side slope and is not easy to collapse.
2. The deep and shallow foundation pit construction structure and the construction method ensure firm connection among the bottom plate, the haunched beam and the crown beam through the first upper rubber band, the second upper rubber band and the lower rubber band, further reinforce the construction structure, effectively improve the bearing capacity of the construction structure, and the reinforcing method is simple and easy to operate and low in cost.
3. According to the deep and shallow foundation pit construction structure and the construction method, the plain concrete reinforcing structure is filled in the fertilizer groove area, the effect of slope foot back pressure in the pit is achieved, instability and landslide caused by stress on only one side of the support pile are prevented, and the stability of the construction structure is further improved.
4. The construction structure and the construction method of the deep and shallow foundation pit solve the waterproof problem of the corresponding underground one-layer and underground two-layer structures by arranging the waterproof layer and the water stop steel plate.
5. According to the construction method, the shallow pit is constructed firstly, and then the deep pit is constructed, so that the construction efficiency is effectively improved, and the reliability of the supporting system is effectively ensured through the arrangement of the haunched beam and the plain concrete reinforcing structure. The construction method is safe and reliable, effectively improves the construction efficiency, and has wide popularization and application values.
Drawings
FIG. 1 is a top plan view of the present invention construction site;
FIG. 2 is a schematic structural diagram of the invention before deep foundation pit excavation;
FIG. 3 is an enlarged view of a portion A of FIG. 2;
FIG. 4 is a schematic view of the construction of the haunch beam of the present invention;
FIG. 5 is a schematic structural view after the construction of the present invention is completed.
In the figure, 1 is shallow foundation pit, 2 is a fender pile, 3 is deep basal pit, 4 is the soleplate, 5 is first rubber band, 6 is main muscle, 7 is the haunched roof beam, 8 is second rubber band, 9 is the water steel sheet, 10 is the lower rubber band, 11 is the hat beam, 12 is plain concrete reinforced structure, 13 is the bottom plate reinforcing bar.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the deep and shallow foundation pit construction structure provided by the invention comprises a deep foundation pit 3 and a shallow foundation pit 1, wherein a plurality of support piles 2 are arranged between the deep foundation pit 3 and the shallow foundation pit 1 at intervals, a crown beam 11 is fixedly arranged at the top of each support pile 2, the crown beam 11 is of an annular structure arranged around the deep foundation pit 3, an armpit beam 7 is arranged on a cushion layer on the side surface of the crown beam 11 positioned on one side of the shallow foundation pit 1, the longitudinal section of the armpit beam 7 is of an inverted trapezoidal structure, and the armpit beam 7 is used for tying the crown beam 11. The supporting piles 2 are subjected to drawknot supporting and reinforcing through the haunching beams 7, and collapse of the soil wall of the deep foundation pit 3 is avoided.
As shown in fig. 3 and 4, a foundation slab 4 is laid at the bottom of the shallow foundation pit 1; a plurality of bottom plate steel bars 13 are embedded in the foundation bottom plate 4, and are arranged in parallel at intervals, and the number of the bottom plate steel bars 13 in the drawing of the embodiment is two;
a first upper rubber band 5, a second upper rubber band 8 and a lower rubber band 10 are embedded in the haunched beam 7, the first upper rubber band 5 is of an L-shaped structure, and one end part of the first upper rubber band is embedded in the foundation bottom plate 4; the second upper rubber band 8 is of an L-shaped structure, and one end part of the second upper rubber band is bound with the steel bar of the crown beam 11; the lower rubber band 10 comprises an inclined section and a horizontal section, the end part of the horizontal section of the lower rubber band 10 is bound with the steel bar in the crown beam 11, and the end part of the inclined section is embedded in the foundation slab 4. The bottom plate reinforcing steel bar 13 is used for reinforcing the bottom plate 4, the bottom plate 4 is tied with the haunched beam 7 through the first upper rubber band 5, the haunched beam 7 is tied with the crown beam 11 through the second upper rubber band 8, and the bearing strength of the construction structure is further improved.
And a plain concrete reinforcing structure 12 is arranged between the deep foundation pit 3 and the support piles 2. Plain concrete reinforced structure 12 is used for filling fertile groove district, avoids that the upper portion of a fender pile 2 only leads to a fender pile 2 easily to collapse near the atress of 1 one side of shallow foundation ditch, further consolidates a fender pile 2.
The waterproof layer is coated on the surfaces of the base plate 4, the haunched beam 7 and the crown beam 11, and the sealing plaster layer is coated on the surface of the waterproof layer of the crown beam 11 and used for preventing seepage water from permeating into a soil wall to cause the soil to be soft and collapse, so that the construction safety is improved. The waterproof layer is a cement-based permeable crystalline waterproof layer.
A construction method of a deep and shallow foundation pit construction structure comprises the following steps:
the method comprises the following steps: excavating a shallow foundation pit 1;
step two: constructing a support pile 2 at the position of the pre-constructed deep foundation pit 3;
step three: excavating earthwork on one side of the support pile 2 far away from the construction position of the deep foundation pit 3 to form a groove for placing the haunched beam 7;
step four: binding reinforcing steel bars of the haunched beam 7 in the grooves, and binding reinforcing steel bars of the crown beam at the top end of the support pile 2;
step five: pouring concrete to form an armpit beam 7, a crown beam 11 and a bottom plate 4;
step six: and (5) excavating a deep foundation pit 3.
Furthermore, in the third step, the supporting piles 2 are excavated, the earthwork is far away from one side of the construction position of the deep foundation pit 3 within the range of 1 m, and the surface of the excavated part, which is opposite to the supporting piles 2, is an inclined surface with the slope coefficient of 1: 1.
Further, in the fifth step, waterproof layers are coated on the surfaces of the poured haunched beam 7, the crown beam 11 and the bottom plate 4, and the waterproof layer is coated on the surface of the waterproof layer of the crown beam 11.
Further, in the fifth step, the armpit beam 7, the crown beam 11 and the bottom plate 4 are formed in a one-time pouring mode.
Further, after the excavation of the deep foundation pit 3 is completed in the sixth step, a plain concrete reinforcing structure 12 is poured on the cushion layer between the deep foundation pit 3 and the support piles 2.
And in the fifth step, the haunched beam 7, the crown beam 11 and the bottom plate 4 are respectively and sequentially poured, and the water stop steel plate 9 is embedded at the joint of the inside of the haunched beam 7, the inside of the crown beam 11 and the inside of the bottom plate 4. The water seepage path is changed, and deep penetrating water containing corrosive components is prevented from permeating into the soil wall along the gaps.
According to the construction structure and the construction method of the deep and shallow foundation pit, the haunch beam is additionally arranged on the outer side of the deep pit, so that the stability of the support pile is effectively improved, the bearing capacity of the support pile is greatly improved, the construction requirement of firstly excavating the shallow foundation pit and then excavating the deep foundation pit can be met, and the construction efficiency and the safety are greatly improved. The fender pile supports only by burying underground position among the prior art, and compared, this depth foundation ditch construction structures bears the weight of intensity higher, is difficult for taking place to collapse.
The construction structure and the construction method of the deep and shallow foundation pit ensure firm connection among the bottom plate, the haunched beam and the crown beam through the first upper rubber band, the second upper rubber band and the lower rubber band, further reinforce the construction structure, effectively improve the bearing capacity of the construction structure, and the reinforcing method is simple and easy to operate and low in cost.
According to the deep and shallow foundation pit construction structure and the construction method, the plain concrete reinforcing structure is filled in the fertilizer groove area, so that the supporting pile is prevented from collapsing easily due to the fact that only one side of the supporting pile is stressed, and the stability of the device is further improved.
According to the construction structure and the construction method of the deep and shallow foundation pit, the waterproof layer and the water stop steel plate are arranged, so that the permeation water is prevented from permeating into the soil wall, the soil is soft and collapses, and the construction safety is improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. The utility model provides a deep and shallow foundation ditch construction structures, includes deep foundation ditch (3) and shallow foundation ditch (1), the interval is provided with a plurality of fender piles (2) between deep foundation ditch (3) and the shallow foundation ditch (1), its characterized in that, fender pile (2) top is equipped with guan liang (11) admittedly, guan liang (11) are located for the ring structure around deep foundation ditch (3) setting shallow foundation ditch (1) one side be provided with on the bed course of guan liang (11) side and add armpit roof beam (7), add the trapezoidal structure of armpit roof beam (7) longitudinal section for invering, it is used for the drawknot to add armpit roof beam (7) guan liang (11).
2. A deep and shallow foundation pit construction structure as claimed in claim 1, wherein a foundation slab (4) is laid at the bottom of the shallow foundation pit (1); a plurality of bottom plate steel bars (13) are embedded in the foundation bottom plate (4), and the bottom plate steel bars (13) are arranged in parallel at intervals;
a first upper rubber band (5), a second upper rubber band (8) and a lower rubber band (10) are embedded in the haunched beam (7), the first upper rubber band (5) is of an L-shaped structure, and one end of the first upper rubber band is embedded in the foundation bottom plate (4); the second upper rubber band (8) is of an L-shaped structure, and one end part of the second upper rubber band is bound with the steel bar of the crown beam (11); the lower rubber band (10) comprises an inclined section and a horizontal section, the end part of the horizontal section of the lower rubber band (10) is bound with the steel bar in the crown beam (11), and the end part of the inclined section is embedded in the foundation slab (4).
3. A deep and shallow foundation pit construction structure according to claim 1, characterized in that a plain concrete reinforcing structure (12) is arranged between the deep foundation pit (3) and the support piles (2).
4. A deep and shallow foundation pit construction structure according to claim 2, wherein the foundation slab (4), the haunched beam (7) and the crown beam (11) are coated with waterproof layers, and the waterproof layers of the crown beam (11) are coated with sealing paste layers.
5. A deep and shallow foundation pit construction method as claimed in any one of claims 1 to 4, comprising the steps of:
the method comprises the following steps: excavating a shallow foundation pit (1);
step two: constructing a support pile (2) at the position of the pre-constructed deep foundation pit (3);
step three: excavating earthwork on one side of the support pile (2) far away from the construction position of the deep foundation pit (3) to form a groove for placing the haunched beam (7);
step four: binding reinforcing steel bars of the haunched beam (7) in the grooves, and binding reinforcing steel bars of the crown beam at the top end of the support pile (2);
step five: pouring concrete to form an armpit beam (7), a crown beam (11) and a foundation slab (4);
step six: and (5) excavating a deep foundation pit (3).
6. The deep and shallow foundation pit construction method according to claim 5, wherein in the third step, the excavated part of the supporting pile (2) is removed from the earthwork within 1 m of the construction position side of the deep foundation pit (3), and the surface of the excavated part opposite to the supporting pile (2) is an inclined surface with a slope coefficient of 1: 1.
7. A deep and shallow foundation pit construction method according to claim 5, wherein in the fifth step, a waterproof layer is coated on the surfaces of the poured haunched beam (7), the crown beam (11) and the foundation slab (4), and a waterproof layer is coated on the surface of the waterproof layer of the crown beam (11).
8. The deep and shallow foundation pit construction method according to claim 5, wherein in the fifth step, the haunched beam (7), the crown beam (11) and the foundation slab (4) are formed in a one-step pouring mode.
9. A deep and shallow foundation pit construction method according to claim 5, wherein in the fifth step, the haunched beam (7), the crown beam (11) and the foundation slab (4) are respectively and sequentially poured, and the water stop steel plate (9) is embedded at the joint of the insides of the haunched beam (7), the crown beam (11) and the foundation slab (4).
10. A deep and shallow foundation pit construction method as claimed in claim 5, wherein in the sixth step, after the deep foundation pit (3) is excavated, a plain concrete reinforced structure (12) is poured on the cushion layer between the deep foundation pit (3) and the support piles (2).
CN202110985666.7A 2021-08-26 2021-08-26 Construction structure and construction method for deep and shallow foundation pit Pending CN113684832A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114525842A (en) * 2022-01-14 2022-05-24 福建省实盛建设工程有限公司 Construction method of high-low inclined bottom plate of basement
CN115506362A (en) * 2022-09-02 2022-12-23 中国建筑第二工程局有限公司 Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof

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Publication number Priority date Publication date Assignee Title
CN202899141U (en) * 2012-10-12 2013-04-24 南京固强建筑技术有限公司 Foundation pit supporting structure suitable for basin type excavation method
CN204456135U (en) * 2014-12-31 2015-07-08 上海建工一建集团有限公司 Basement side bar for controlling deformation of deep excavation strengthens structure
CN206607593U (en) * 2017-03-06 2017-11-03 浙江省一建建设集团有限公司 One kind falls the vertical floor support changing structure for use of grade formula deep basal pit
CN208899527U (en) * 2018-08-29 2019-05-24 山东大学 A kind of supporting and the integrated system of Pipe rack
CN211285630U (en) * 2019-11-21 2020-08-18 浙江艮威水利建设有限公司 Double-support construction structure for soft foundation deep foundation pit
CN112982427A (en) * 2021-03-22 2021-06-18 云南建投第一勘察设计有限公司 Reinforcement construction method for foundation pit dangerous case in soft soil area
CN113047347A (en) * 2021-02-21 2021-06-29 深圳市九象数字科技有限公司 Deep foundation pit monitoring system and monitoring method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202899141U (en) * 2012-10-12 2013-04-24 南京固强建筑技术有限公司 Foundation pit supporting structure suitable for basin type excavation method
CN204456135U (en) * 2014-12-31 2015-07-08 上海建工一建集团有限公司 Basement side bar for controlling deformation of deep excavation strengthens structure
CN206607593U (en) * 2017-03-06 2017-11-03 浙江省一建建设集团有限公司 One kind falls the vertical floor support changing structure for use of grade formula deep basal pit
CN208899527U (en) * 2018-08-29 2019-05-24 山东大学 A kind of supporting and the integrated system of Pipe rack
CN211285630U (en) * 2019-11-21 2020-08-18 浙江艮威水利建设有限公司 Double-support construction structure for soft foundation deep foundation pit
CN113047347A (en) * 2021-02-21 2021-06-29 深圳市九象数字科技有限公司 Deep foundation pit monitoring system and monitoring method
CN112982427A (en) * 2021-03-22 2021-06-18 云南建投第一勘察设计有限公司 Reinforcement construction method for foundation pit dangerous case in soft soil area

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114525842A (en) * 2022-01-14 2022-05-24 福建省实盛建设工程有限公司 Construction method of high-low inclined bottom plate of basement
CN115506362A (en) * 2022-09-02 2022-12-23 中国建筑第二工程局有限公司 Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof
CN115506362B (en) * 2022-09-02 2023-07-25 中国建筑第二工程局有限公司 Mucky soil deep and shallow foundation pit supporting structure and construction method thereof

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Application publication date: 20211123