CN117071576A - Soft soil foundation pit supporting structure and supporting methods and lattice steel pipe piles - Google Patents

Soft soil foundation pit supporting structure and supporting methods and lattice steel pipe piles Download PDF

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Publication number
CN117071576A
CN117071576A CN202310958040.6A CN202310958040A CN117071576A CN 117071576 A CN117071576 A CN 117071576A CN 202310958040 A CN202310958040 A CN 202310958040A CN 117071576 A CN117071576 A CN 117071576A
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steel pipe
lattice
pile
pipe piles
foundation pit
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CN202310958040.6A
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CN117071576B (en
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刘金华
谭海林
李建金
黄明艳
肖豪
李宁
刘恒
贺敬哲
刘洪瑶
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Hunan Chemical Geological Engineering Exploration Institute Co ltd
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Hunan Chemical Geological Engineering Exploration Institute Co ltd
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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
    • 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
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

本发明属于软土基坑支护领域，公开了一种软土基坑支护结构及其支护方法和格构式钢管桩，其中所述软土基坑支护结构，由多根格构式钢管桩排布于挡土侧；所述格构式钢管桩由三肢缀条式桩体和焊接于桩体顶部的压顶板组成，所述压顶板的中部设置有孔洞；所述格构式钢管桩于挡土侧全部正置或/和一正一反交替布置有一排或多排；位于临空侧的一排所述格构式钢管桩通过多根腰梁连接在一起。本发明采用格构式钢管桩作为软土基坑的支护，相对于常规旋挖成孔灌注支护桩，能大大缩短工期，节省施工成本；相对于钢板桩支护，能提高支护结构的抗侧刚度，有效的抑制了形变，增加了安全性。

The invention belongs to the field of soft soil foundation pit support, and discloses a soft soil foundation pit support structure, a support method thereof, and a grid-type steel pipe pile, wherein the soft soil foundation pit support structure is composed of multiple grids. The structural steel pipe piles are arranged on the retaining side; the lattice steel pipe piles are composed of a three-limbed strip pile body and a pressure plate welded to the top of the pile body, and a hole is provided in the middle of the pressure plate; The lattice-type steel pipe piles are all placed upright on the retaining side or/and one or more rows are alternately arranged upright and reversely; the row of lattice-type steel pipe piles located on the air side is connected by multiple waist beams together. The present invention uses lattice steel pipe piles as support for soft soil foundation pits. Compared with conventional rotary digging hole-forming cast-in-place support piles, the construction period can be greatly shortened and construction costs saved; compared with steel sheet pile support, the support can be improved. The lateral stiffness of the structure effectively inhibits deformation and increases safety.

Description

Soft soil foundation pit supporting structure, supporting method thereof and lattice type steel pipe pile
Technical Field
The invention relates to the field of soft soil foundation pit support, in particular to a soft soil foundation pit support structure, a support method thereof and lattice type steel pipe piles.
Background
In engineering construction, excavation of foundation pits on soft foundations deposited in Hunan or sea phases is often encountered. At this time, if the conventional rotary-digging hole-forming concrete bored concrete pile is adopted, the defects of difficult hole forming, poor concrete pouring quality (easy necking, mud clamping and the like), long construction period, high cost and the like exist, and if the conventional steel sheet pile is adopted, the problems of insufficient safety reserve, large foundation pit deformation and the like often occur due to the weak side rigidity of the steel sheet pile although the defects are avoided.
Therefore, it is necessary to design a pile foundation for soft soil foundation pit support to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems existing in the prior art. Therefore, the invention provides a soft soil foundation pit supporting structure, a supporting method thereof and lattice type steel pipe piles.
The technical scheme adopted for solving the technical problems is as follows:
providing a soft soil foundation pit supporting structure, wherein a plurality of lattice steel pipe piles are arranged on a soil retaining side; the lattice type steel pipe pile consists of a three-limb lacing bar type pile body and a pressing plate welded at the top of the pile body, and a hole is formed in the middle of the pressing plate; the lattice type steel pipe piles are all arranged in the front or/and one front or one back alternately on the soil retaining side, and one row or a plurality of rows are arranged in the front or one back alternately; and a row of lattice type steel pipe piles positioned on the temporary side are connected together through a plurality of waist beams.
The supporting method of the soft soil foundation pit supporting structure is also provided, and the supporting method is constructed according to the following method:
arranging a plurality of lattice steel pipe piles into one row or a plurality of rows at a set interval on the soil retaining side in a way of all positive arrangement or/and one positive-negative alternation;
connecting a row of lattice type steel pipe piles on the empty side together through a plurality of waist beams;
when the lattice type steel pipe piles are provided with a plurality of rows, adopting H-shaped steel to weld and connect the pressing plates of the plurality of rows of lattice type steel pipe piles into a whole;
and after the foundation pit is backfilled, pulling out the lattice type steel pipe piles, and recycling.
Preferably, the lattice type steel pipe pile is driven into soil body through static pressure or hammering, and a pile cap is arranged on a pile pressing plate during pile pressing.
Preferably, after the lattice type steel pipe pile is implanted into the soil body, fine stone concrete can be poured into the holes of the pressing top plate at the top of the steel pipe pile, so that the strength of the steel pipe type steel pipe pile is enhanced.
Still provide one kind weak soil foundation ditch supporting construction in lattice formula steel-pipe pile, the three limb batten strip pile body is by three column limbs that are equilateral triangle and the polylith batten strip of welding between two adjacent column limbs constitute, column limb and batten strip and roof board are full penetration welded joint.
Preferably, the column limb adopts a steel pipe, and a conical pile tip is welded at the bottom of the steel pipe.
Preferably, the steel pipe is made of Q235B or Q345B steel, the outer diameter of the steel pipe is 146 mm-245 mm, and the wall thickness of the steel pipe is 6 mm-16 mm.
Preferably, the conical pile tip is made of Q235B steel, the plate thickness is 6mm, and the cone angle is 40-60 degrees.
Preferably, the batten is made of Q235B steel, the plate thickness is 8-16 mm, and the distance between the topmost batten and the pressing plate is not more than 200mm.
Preferably, the height-width ratio of the batten strips is 1:2-1:2.5, and the distance between two adjacent batten strips is 1-2 times the height of the batten strips.
Preferably, the pressing plate is made of Q235B steel, the outer contour of the pressing plate is an equilateral triangle with angles removed, and the holes are profiling holes of the outer contour of the pressing plate.
Compared with the prior art, the invention has the beneficial effects that:
the lattice type steel pipe piles are used as the support of the soft soil foundation pit, compared with the conventional rotary digging pore-forming pouring support piles, the construction period can be greatly shortened, and the construction cost is saved; compared with the steel sheet pile support, the side stiffness of the support structure can be improved, deformation is effectively restrained, and safety is improved.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a plan view of a first embodiment of a soft soil foundation pit supporting structure provided by the present invention;
FIG. 2 is a plan view of a second embodiment of the soft soil foundation pit supporting structure provided by the present invention;
FIG. 3 is a plan view of a third embodiment of a soft soil foundation pit supporting structure provided by the present invention;
fig. 4 is a schematic structural view of a lattice type steel pipe pile according to the present invention;
fig. 5 is a top perspective view of the lattice-type steel-pipe pile provided in fig. 4.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that all directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indication is correspondingly changed.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Example 1
The present embodiment provides a soft soil foundation pit supporting structure, as shown in fig. 1 to 3, which is formed by arranging a plurality of lattice type steel pipe piles 1 on a soil retaining side.
Preferably, as shown in fig. 4 and fig. 5, the lattice type steel pipe pile 1 is composed of a three-limb batten type pile body 1.1 and a pressing top plate 1.2 welded at the top of the pile body, the pressing top plate is arranged to enable the pile body to be uniformly stressed when being driven into soil, meanwhile, the connection strength of three column limbs of the pile body can be enhanced, a hole 1.2.0 is formed in the middle of the pressing top plate 1.2, concrete is conveniently poured into the pile body, and the strength of the pile body is enhanced.
In specific implementation, the supporting mode of the lattice type steel pipe pile is preferably as follows:
first embodiment: as shown in fig. 1, the lattice-type steel pipe piles 1 are all arranged in a row on the soil-retaining side.
Second embodiment: as shown in fig. 2, the lattice-type steel pipe piles 1 are alternately arranged in a row on the earth-retaining side.
Third embodiment: as shown in fig. 3, the lattice-type steel pipe piles 1 are alternately arranged in a plurality of rows, one on each side of the earth retaining wall, and two rows are provided in the illustrated embodiment, and more than two rows may be provided.
Preferably, a row of lattice type steel pipe piles 1 of the supporting structure positioned on the empty side are connected together through a plurality of waist beams 2.
The supporting method of the soft soil foundation pit supporting structure of the embodiment is as follows:
driving a plurality of lattice steel pipe piles into soil on the soil retaining side according to the actual situation and the preset interval by static pressure or hammering according to the implementation mode, and arranging pile caps on a pile pressing plate when pile pressing;
connecting a row of lattice type steel pipe piles on the empty side together through a plurality of waist beams;
when the lattice type steel pipe piles 1 are provided with a plurality of rows, the H-shaped steel 3 is adopted to weld and connect the pressing plates 1.2 of the plurality of rows of lattice type steel pipe piles 1 into a whole;
according to the design strength, fine stone concrete can be poured into holes of a pressing top plate at the top of the steel pipe pile when necessary, so that the strength of the steel pipe type steel pipe pile is enhanced;
and after the foundation pit is backfilled, pulling out the lattice type steel pipe piles, and recycling.
Example 2
The present embodiment provides a lattice steel pipe pile according to embodiment 1, as shown in fig. 4 and fig. 5, a pile body 1.1 of the steel pipe pile 1 is composed of three equilateral triangle-shaped column limbs 1.1.1 and a plurality of battens 1.1.2 welded between two adjacent column limbs 1.1.1, wherein the column limbs 1.1.1 are connected with the battens 1.1.2 and a roof pressing plate 1.2 by full penetration weld joints. According to the steel pipe pile, the column limbs are connected into a whole through the plurality of lacing bars, so that the lateral rigidity of the steel pipe pile is greatly improved.
Preferably, the column limb 1.1.1 is made of steel pipe, the steel pipe is made of Q235B or Q345B steel, the outer diameter of the steel pipe is 146 mm-245 mm, and the wall thickness of the steel pipe is 6 mm-16 mm; the bottom of the steel pipe is welded with a conical pile tip, the conical pile tip is made of Q235B steel, the thickness of the steel pipe is 6mm, the cone angle is 40-60 degrees, and the arrangement of the conical pile tip can enable the steel pipe pile to be driven into the soil body smoothly.
Preferably, the batten strip 1.1.2 is made of Q235B steel, the plate thickness is 8-16 mm, and the distance between the topmost batten strip 1.1.2 and the pressing plate 1.2 is not more than 200mm.
Preferably, the height-width ratio of the batten strips 1.1.2 is 1:2-1:2.5, and the distance between two adjacent batten strips is 1-2 times the height of the batten strips. The design meets the requirements of the steel pipe pile on lateral rigidity resistance and meets the requirements of the connection strength of the column limbs.
Preferably, the pressing plate 1.2 is made of Q235B steel, the outline of the pressing plate is an equilateral triangle with angles removed, and the hole 1.2.0 is a profiling hole of the outline of the pressing plate. The pressing plate adopts the shape of the chamfer reserved hole, so that the consumption of steel can be reduced, the cost is saved, a grasping space can be provided for the vibrating hammer, and the steel pipe pile can be conveniently driven and pulled.
Noteworthy are: the lattice type steel pipe pile provided by the invention can be combined with other foundation pit supporting forms, such as lattice type steel pipe pile, upper slope or soil nailing wall, lattice type steel pipe pile, internal support or diagonal support, lattice type steel pipe pile, soil body reinforcement, lattice type steel pipe pile, anchor rod (anchor rope) and the like.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.

Claims (10)

1.一种软土基坑支护结构，其特征在于：由多根格构式钢管桩排布于挡土侧；1. A soft soil foundation pit support structure, which is characterized by: a plurality of lattice-type steel pipe piles arranged on the retaining side; 所述格构式钢管桩由三肢缀条式桩体和焊接于桩体顶部的压顶板组成，所述压顶板的中部设置有孔洞；The lattice-type steel pipe pile is composed of a three-limb pile body and a top plate welded to the top of the pile body, and a hole is provided in the middle of the top plate; 所述格构式钢管桩于挡土侧全部正置或/和一正一反交替布置有一排或多排；The lattice-type steel pipe piles are all placed upright on the retaining side or/and one row or multiple rows are alternately arranged upright and reversely; 位于临空侧的一排所述格构式钢管桩通过多根腰梁连接在一起。A row of the lattice-type steel pipe piles located on the airport side are connected together by multiple waist beams. 2.一种如权利要求1所述的软土基坑支护结构的支护方法，其特征在于：按如下方法施工：2. A supporting method for a soft soil foundation pit supporting structure as claimed in claim 1, characterized in that: construction is carried out as follows: 将若干根格构式钢管桩按设定间距在挡土侧采用全部正置或/和一正一反交替布置为一排或多排；Several lattice-type steel pipe piles are arranged in one or more rows on the retaining side at set intervals, all upright or/and one upright and one reverse alternately; 将临空侧的一排所述格构式钢管桩通过多根腰梁连接在一起；Connect a row of the lattice-type steel pipe piles on the airside side through multiple waist beams; 当格构式钢管桩设置有多排时，采用H型钢将多排格构式钢管桩的压顶板焊接连接成整体；When there are multiple rows of lattice steel pipe piles, H-shaped steel is used to weld and connect the top plates of the multiple rows of lattice steel pipe piles into a whole; 待基坑回填后，将格构式钢管桩拔出，回收重复利用。After the foundation pit is backfilled, the lattice steel pipe piles are pulled out and recycled for reuse. 3.根据权利要求2所述的支护方法，其特征在于：所述格构式钢管桩通过静压或锤击打入土体，压桩时在压顶板上设置桩帽。3. The support method according to claim 2, characterized in that: the lattice steel pipe pile is driven into the soil by static pressure or hammering, and a pile cap is provided on the top plate during pile pressing. 4.根据权利要求2所述的支护方法，其特征在于：所述格构式钢管桩植入土体内后，可由所述钢管桩顶部的压顶板的孔洞中灌入细石混凝土，增强钢管式钢管桩的强度。4. The support method according to claim 2, characterized in that: after the lattice steel pipe pile is implanted in the soil, fine stone concrete can be poured into the holes of the top pressure plate on the top of the steel pipe pile. Enhance the strength of steel pipe piles. 5.一种如权利要求1所述的软土基坑支护结构中所述的格构式钢管桩，其特征在于：所述三肢缀条式桩体由三根呈等边三角形分布的柱肢和焊接于相邻两根柱肢之间的多块缀条组成，所述柱肢与缀条和压顶板全熔透焊缝连接。5. A lattice-type steel pipe pile in the soft soil foundation pit support structure as claimed in claim 1, characterized in that: the three-limb strip pile body is composed of three equilateral triangles. The column legs are composed of a plurality of strips welded between two adjacent column legs, and the column legs are connected to the strips and the top plate with full penetration welds. 6.根据权利要求5所述的格构式钢管桩，其特征在于：所述柱肢采用钢管，钢管的底部焊接有锥形桩尖。6. The lattice steel pipe pile according to claim 5, characterized in that: the column limbs are made of steel pipes, and the bottom of the steel pipes is welded with a tapered pile tip. 7.根据权利要求6所述的格构式钢管桩，其特征在于：所述钢管采用Q235B或Q345B钢材制成，其外径为146mm～245mm，壁厚为6mm～16mm；所述锥形桩尖采用Q235B钢材制成，板厚为6mm，锥角为40～60°。7. The lattice steel pipe pile according to claim 6, characterized in that: the steel pipe is made of Q235B or Q345B steel, with an outer diameter of 146mm~245mm and a wall thickness of 6mm~16mm; the tapered shape The pile tip is made of Q235B steel, with a plate thickness of 6mm and a cone angle of 40 to 60°. 8.根据权利要求5所述的格构式钢管桩，其特征在于：所述缀条采用Q235B钢材，板厚为8～16mm，最顶部的所述缀条与所述压顶板的间距不超过200mm。8. The lattice steel pipe pile according to claim 5, characterized in that: the decorative strips are made of Q235B steel, the plate thickness is 8-16mm, and the distance between the topmost decorative strips and the top pressure plate is not less than 10 mm. More than 200mm. 9.根据权利要求8所述的格构式钢管桩，其特征在于：所述缀条的高宽比为1:2～1:2.5，且上下相邻的两个缀条的间距为1～2倍缀条的高度。9. The lattice type steel pipe pile according to claim 8, characterized in that: the height-to-width ratio of the decorative strips is 1:2 to 1:2.5, and the distance between two adjacent decorative strips is 1 ~2 times the height of the strip. 10.根据权利要求5所述的格构式钢管桩，其特征在于：所述压顶板采用Q235B钢材，外轮廓为去角的等边三角形，所述孔洞为所述压顶板外轮廓的仿形孔。10. The lattice steel pipe pile according to claim 5, characterized in that: the top pressure plate is made of Q235B steel, the outer contour is an equilateral triangle with corners removed, and the holes are imitations of the outer contour of the top pressure plate. shaped hole.
CN202310958040.6A 2023-08-01 2023-08-01 Soft soil foundation pit support structures and their support methods and lattice steel pipe piles Active CN117071576B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009133099A (en) * 2007-11-30 2009-06-18 Ikuo Suzuki Self-supporting retaining wall
CN103195056A (en) * 2013-04-25 2013-07-10 福州市第三建筑工程公司 Prestressed composite pipe pile and its on-site assembly method
CN204326082U (en) * 2014-11-26 2015-05-13 上海勘测设计研究院有限公司 A kind of foundation pit enclosure structure be applicable on soft foundation
CN112627221A (en) * 2020-11-06 2021-04-09 重庆大学 Prestressed hollow sandwich concrete-filled steel tube lattice type mixed jacket
CN215801565U (en) * 2021-09-02 2022-02-11 天津市水务规划勘测设计有限公司 Retaining structure for steel pipe pile combined anchoring pile
CN114150692A (en) * 2021-12-16 2022-03-08 广东省水利水电第三工程局有限公司 Construction method for transverse connection of steel pipes of lattice type steel pipe piles in water
CN115094788A (en) * 2022-06-27 2022-09-23 四川路桥桥梁工程有限责任公司 Steel pipe lattice pier for pier and bridge repairing operation and construction method thereof
CN220521354U (en) * 2023-08-01 2024-02-23 湖南化工地质工程勘察院有限责任公司 Soft soil foundation pit supporting structure and lattice type steel pipe pile

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009133099A (en) * 2007-11-30 2009-06-18 Ikuo Suzuki Self-supporting retaining wall
CN103195056A (en) * 2013-04-25 2013-07-10 福州市第三建筑工程公司 Prestressed composite pipe pile and its on-site assembly method
CN204326082U (en) * 2014-11-26 2015-05-13 上海勘测设计研究院有限公司 A kind of foundation pit enclosure structure be applicable on soft foundation
CN112627221A (en) * 2020-11-06 2021-04-09 重庆大学 Prestressed hollow sandwich concrete-filled steel tube lattice type mixed jacket
CN215801565U (en) * 2021-09-02 2022-02-11 天津市水务规划勘测设计有限公司 Retaining structure for steel pipe pile combined anchoring pile
CN114150692A (en) * 2021-12-16 2022-03-08 广东省水利水电第三工程局有限公司 Construction method for transverse connection of steel pipes of lattice type steel pipe piles in water
CN115094788A (en) * 2022-06-27 2022-09-23 四川路桥桥梁工程有限责任公司 Steel pipe lattice pier for pier and bridge repairing operation and construction method thereof
CN220521354U (en) * 2023-08-01 2024-02-23 湖南化工地质工程勘察院有限责任公司 Soft soil foundation pit supporting structure and lattice type steel pipe pile

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