CN211690359U - Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall - Google Patents

Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall Download PDF

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Publication number
CN211690359U
CN211690359U CN201922224123.4U CN201922224123U CN211690359U CN 211690359 U CN211690359 U CN 211690359U CN 201922224123 U CN201922224123 U CN 201922224123U CN 211690359 U CN211690359 U CN 211690359U
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China
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pile
retaining
special
shaped retaining
fender
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Inventor
戴志仁
张庆闯
廖晖
喻忠
吕海军
赵亚军
刘彤
段建锋
许红春
张毓斌
李谈
查家宏
王维
马琳琳
王耀辉
陈新平
王文彬
孟宪全
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China Railway First Survey and Design Institute Group Ltd
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China Railway First Survey and Design Institute Group Ltd
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Abstract

The utility model relates to a pile board wall structure based on rigid contact of a post-pile abnormal-shaped retaining wall, which comprises a fender pile and an abnormal-shaped retaining wall; the guard piles are cylindrical in cross section and are arranged at intervals along the edge of the foundation pit, and the special-shaped retaining walls are positioned between the adjacent guard piles; the section of the special-shaped retaining wall is wide outside and narrow inside, and the left side and the right side are concave arc surfaces and are closely attached to the outer wall of the fender post. The utility model discloses utilize the convex close-fitting rigid contact between heterotypic barricade and the fender pile, with the horizontal shear force between the conventional fender pile that the horizontal load of stratum corresponds and the barricade between the stake, turn into the axial force of perpendicular to arc surface, effectively improved conventional bar planting mode and leaded to being connected between fender pile and the barricade weak, can't effectively undertake the shortcoming of stratum level to the shear force, it is clear to have the atress, the design is simple, with low costs and advantage such as simple and convenient of technology, can provide reference for foundation ditch engineering stability design.

Description

Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall
Technical Field
The utility model belongs to the technical field of underground works, concretely relates to stake slab wall structure based on heterotypic barricade rigid contact behind stake.
Background
With the rapid development of economy, in order to guide the reasonable layout and the orderly development of cities and fully utilize underground resources to provide a wide extension space for the development of the cities, in recent years, the underground space gradually develops towards a large buried depth and a large space, more and more foundation pit projects are arranged next to or closely attached to important buildings (structures), and the requirements on the bearing capacity and the environmental protection of a foundation pit enclosure structure are more and more strict.
The stability of foundation ditch is often influenced because of the local collapse of soil body between the fender pile, seepage, especially appears more easily under the comparatively anomalous condition in foundation ditch degree of depth great, foundation ditch plane, often leads to fender pile back local undercutting or loose, causes the deformation or the local collapse of soil body, and then endangers foundation ditch all ring border environment safety. In recent years, with the further acceleration of urban construction speed, large buried depth underground space structures with complex shapes are increasing day by day, especially with the development of station-city integration (or TOD) based on rail transit, the situations that urban rail transit is changed into stations in multiple lines, various existing line projects are passed through or side-by-side construction and the like are more and more common, various complex foundation pit projects adjacent to important buildings (structures) are emerging continuously, the stability of soil bodies among foundation pit retaining piles restricts the safety of large complex foundation pits to a certain extent, and the soil bodies even become a control factor of underground engineering design under certain conditions. Whether the measures for stabilizing and preventing leakage of the soil body between the piles are reasonable or not is directly related to the safety of foundation pit engineering, and the unreasonable measures for treating the soil body between the piles can cause huge potential safety hazards.
Disclosure of Invention
The utility model aims at providing a stake siding wall structure based on heterotypic barricade rigid contact behind stake, execute between foundation ditch fender pile and do heterotypic barricade and to the inboard protruding foot of foundation ditch, heterotypic barricade monolithic concreting between protruding foot and stake, utilize the convex rigid contact between heterotypic barricade and the fender pile, the fender pile that arouses the stratum load and the level of stake are to the shear force, turn into the axial pressure along the arc surface, improve the interlock ability between heterotypic barricade and the fender pile and the whole ability of resisting horizontal load of foundation ditch, improve the overall stability of foundation ditch engineering, satisfy the construction needs of all kinds of complicated underground works.
The utility model discloses the technical scheme who adopts does:
the utility model provides a stake bulkhead structure based on heterotypic barricade rigid contact behind stake which characterized in that:
the pile-plate wall structure comprises a fender post and a special-shaped retaining wall;
the guard piles are cylindrical in cross section and arranged at intervals along the edge of the foundation pit, and the special-shaped retaining walls are positioned between the adjacent guard piles; the inner side and the outer side of the special-shaped retaining wall are vertical planes, the outer side is wide, the inner side is narrow, and the left side and the right side are concave arc surfaces and are closely attached to the outer wall of the fender post.
The length direction of the inner side and the outer side of the special-shaped retaining wall is parallel to a central connecting line of the fender pile, the inner side of the special-shaped retaining wall is located on the inner side of the central connecting line of the fender pile, and the outer side of the special-shaped retaining wall is tangent to the outer side wall of the fender pile.
The bottom of the special-shaped retaining wall is provided with a retaining wall convex foot which is bent towards the inside of the foundation pit, the retaining wall convex foot is horizontal and is vertical to the special-shaped retaining wall, and the retaining wall convex foot is connected with the bottom of the special-shaped retaining wall into a whole.
The retaining wall convex foot of abnormal shape retaining wall is located below the foundation ditch bottom surface, and the top surface of retaining wall convex foot flushes with the foundation ditch bottom line.
The special-shaped retaining wall is in rigid contact with the fender post, and the contact surface is arc-shaped.
The distance between adjacent fender piles is not more than twice the pile diameter.
The guard post, the special-shaped retaining wall and the retaining wall convex foot are all made of reinforced concrete structures.
The utility model has the advantages of it is following:
the utility model provides a novel pile board wall structure system has richened current foundation ditch envelope design method. The foundation pit fender pile is a conventional cast-in-situ bored pile, the construction process is mature, and the related hole-forming pile driving equipment and other auxiliary facilities are conventional mechanical equipment; the special-shaped retaining wall, the convex feet from the bottom of the retaining wall to the inner side of the foundation pit, the steel bars, the waterproof concrete, the template, the slurry and the like adopted by the backfill grouting of the back side of the retaining wall are all conventional materials, the design size is conventional, and the construction is simple and easy. The size and the buried depth of the convex foot at the bottom of the retaining wall towards the inner side of the foundation pit can be flexibly arranged at a certain depth of the bottom of the foundation pit according to the stability requirement of the foundation pit and construction factors, so that the problems that the traditional foundation pit retaining piles are connected in a rib planting mode, the stability of soil bodies among the piles is poor, the anti-leakage capacity of the foundation pit is insufficient, the stability of the foundation pit is difficult to guarantee and the economic and technical benefits are obvious are effectively solved.
The special-shaped retaining wall in rigid contact with the arc of the foundation pit fender pile and the protruding feet at the bottom of the retaining wall towards the inner side of the foundation pit form a structural wall which integrally resists horizontal loads of the stratum together with the foundation pit fender pile, so that the common stress of the fender pile and the inter-pile retaining wall is realized, the lateral rigidity of the foundation pit fender structure is greatly improved, and the potential deformation risk of the foundation pit is reduced. The utility model discloses have higher economic benefits and social, have extensive application prospect in underground structure engineering such as urban rail transit, municipal highway, civil buildings.
Drawings
Fig. 1 is a layout view of a supporting plane of a special-shaped pile slab wall structure.
Figure 2 is a sectional view of the foundation pit support.
Fig. 3 is a front view of the support of the special-shaped pile slab wall structure.
Fig. 4 is a large-scale drawing of a special-shaped pile slab wall structure.
In the figure, 1-fender pile, 2-abnormal-shaped retaining wall, 3-retaining wall convex foot, 4-foundation pit outer side stratum, 5-foundation pit inner side, 6-foundation pit bottom line and 7-embedded grouting pipe.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a pile board wall structure based on rigid contact of a post-pile abnormal-shaped retaining wall, which comprises a fender pile 1 and an abnormal-shaped retaining wall 2; the fender post 1 adopts a cylindrical section and is arranged along the edge of the foundation pit at a certain interval, and the special-shaped retaining wall 2 is positioned between the adjacent fender posts 1; the inner side and the outer side of the special-shaped retaining wall 2 are vertical planes which are generally wide outside and narrow inside, and the left side and the right side are concave arc surfaces and are closely attached to the outer wall of the fender pile 1.
The length directions of the inner side and the outer side of the special-shaped retaining wall 2 are parallel to the central connecting line of the fender pile 1, the inner side of the special-shaped retaining wall 2 is positioned on the inner side of the central connecting line of the fender pile 1, and the outer side of the special-shaped retaining wall 2 is tangent to the outer side wall of the fender pile 1.
The bottom of the abnormal-shaped retaining wall 2 is provided with a retaining wall convex foot 3 bent towards the inside of the foundation pit, and the retaining wall convex foot 3 is horizontally arranged and is perpendicular to the abnormal-shaped retaining wall 2. The retaining wall convex foot 3 of the abnormal-shaped retaining wall 2 is positioned below the bottom surface of the foundation pit, and the top surface of the retaining wall convex foot 3 is flush with the bottom line 6 of the foundation pit. The special-shaped retaining wall 2 and the bottom of the retaining wall convex foot 3 are connected into a whole and are stressed together.
The special-shaped retaining wall 2 is in arc rigid contact with the fender post 1. The distance between adjacent fender piles 1 is not more than twice the pile diameter. The fender pile 1, the special-shaped retaining wall 2 and the retaining wall convex foot 3 are all of reinforced concrete structures.
The construction method of the pile-slab wall structure based on the rigid contact of the post-pile special-shaped retaining wall comprises the following steps:
the method comprises the following steps: leveling a field, driving a dewatering well to dewater a foundation pit, constructing fender posts 1 for constructing the foundation pit according to a set sequence, constructing pile top crown beams, excavating the foundation pit, excavating soil bodies between adjacent fender posts 1 in a segmented undercutting manner when the foundation pit is excavated to a certain depth, spraying and mixing in time according to the stable condition of the stratum, then erecting a mold, placing a reinforcement cage and pouring special-shaped retaining wall 2 concrete;
step two: the stratum excavation construction at the position of the special-shaped retaining wall 2 adopts an interval jumping excavation mode, the construction height of the special-shaped retaining wall 2 along the depth direction is not more than 2-3m every time according to the stratum stability condition and the layered excavation depth of the foundation pit, and the construction height is kept consistent with the excavation depth footage of the foundation pit;
step three: after the special-shaped retaining wall 2 is poured, if the inner side length of the special-shaped retaining wall 2 is smaller than the distance between piles, the net sprayed concrete is adopted for processing on the surface of the retaining wall in time, and the inner surface of the foundation pit enclosure structure is ensured to be smooth;
step four: in the process of excavation of the foundation pit, along with pouring of the special-shaped retaining wall 2, erecting an inner support at a corresponding position while excavating until the bottom of the foundation pit;
step five: continuing to pull the groove along the inner side of the fender post 1 for excavation, wherein the plane dimension and the depth of the pull groove are determined according to the dimension of the retaining wall convex foot 3, and integrally pouring the retaining wall convex foot 3 and the last mould special-shaped retaining wall 2;
step six: constructing a plain concrete cushion layer at the bottom of the foundation pit, covering the top of the cushion layer with retaining wall convex feet 3, then laying a waterproof layer and a fine aggregate concrete protective layer, and pouring a main body structure; and finally, backfilling the upper part of the top plate of the main structure and performing earth surface recovery construction.
If 2 positions department stratum undercuts of abnormal shape barricade and jumps to dig the formation and surpasses and dig during, adopts pre-buried slip casting pipe 7 in good time during 2 pouring of abnormal shape barricade, looks the stratum and surpasses to dig and spout the muddy condition, in time carries out 2 backs of abnormal shape barricade and backfill slip casting processing, ensures 2 backs of abnormal shape barricade that the stratum is closely knit.
The present invention is further described in detail with reference to fig. 1 and 4:
the utility model discloses a novel pile board wall structure includes foundation ditch fender pile 1, arranges according to vertical determining deviation between the foundation ditch fender pile 1, and heterotypic barricade 2 and barricade bottom are to inboard protruding foot 3 of foundation ditch between the stake. The special-shaped retaining wall 2 is in arc rigid contact with the fender post, and the special-shaped retaining wall 2 and the bottom convex foot 3 are integrally cast. The arc-shaped rigid contact between the fender post 1 and the special-shaped retaining wall 2 is utilized to convert horizontal shearing force into axial force along an arc surface, the horizontal bearing capacity of the foundation pit support structure and the stability of soil bodies among the posts are improved, and the stability of the bottom of the foundation pit is improved by utilizing the special-shaped retaining wall 2 and the bottom convex foot 3.
The design parameters of the special-shaped retaining wall 2, such as the side length of the outer side surface, the side length of the inner side surface and the thickness of a wall body, can be comprehensively determined according to the requirements of the self-stability capability of the stratum and the stability of the foundation pit, the specific position and the size of the retaining wall convex foot 3 can also be determined according to the stability of the stratum at the bottom of the foundation pit, the stability of the stratum between the retaining piles is increased by utilizing the special-shaped retaining wall 2 between the piles and the retaining wall convex foot 3, and meanwhile, the.
The abnormal-shaped retaining wall 2 is comprehensively determined according to the integral layered excavation depth of the foundation pit and the self-stability condition of the soil body between the piles in the excavation process of the foundation pit, generally constructed by segmenting according to the depth of 2-3m, and meanwhile, in the process of excavating the soil body cut behind the fender post 1, the stratum 4 outside the foundation pit is ensured to be stable by spraying and mixing treatment as necessary according to the stratum stability condition, jumping excavation construction is carried out between the piles, and the supporting is carried out along with excavation according to the design condition of the inner support until the bottom of the foundation pit. And (3) carrying out pull groove excavation below the bottom line 6 of the foundation pit, then pouring the retaining wall convex foot 3 according to requirements, and integrally pouring the convex foot 3 and the last mould special-shaped retaining wall 2. And then laying a cushion layer and a waterproof layer, pouring an underground engineering main body structure, finally backfilling and covering soil, and recovering road traffic or road greening.
The foundation pit fender pile 1 is in rigid contact with the special-shaped retaining wall 2 along the arc surface, the shearing force between piles is converted into axial pressure, the stability and the lateral rigidity of the retaining structure are effectively improved, the protruding feet 3 at the bottom of the retaining wall are added, the overall stability of the foundation pit is greatly improved, the common stress of the fender pile and the retaining wall between piles is realized, the lateral overall rigidity of the foundation pit retaining structure is greatly improved, and the potential deformation risk of the foundation pit is reduced.
The construction method of the novel pile slab wall structure based on the rigid contact of the post-pile special-shaped retaining wall comprises the following steps:
the method comprises the following steps: leveling the field and constructing a dewatering well to dewater the foundation pit, constructing foundation pit fender piles 1 according to a set sequence, constructing pile top crown beams, excavating the foundation pit, excavating soil bodies between adjacent fender piles 1 in a segmented cut manner when the foundation pit is excavated to a certain depth, spraying and mixing in time according to the stable condition of the stratum 4, and then erecting a mold, placing a reinforcement cage and pouring special-shaped retaining wall 2 concrete.
Step two: the excavation construction of the stratum 4 at the position of the special-shaped retaining wall 2 needs to adopt an interval jumping excavation mode, the construction height of the special-shaped retaining wall 2 along the depth direction should not exceed 2-3m every time according to the stable condition of the stratum 4 and the layered excavation depth of the foundation pit, and the construction height is kept as consistent as possible with the excavation depth footage of the foundation pit.
Step three: after the special-shaped retaining wall 2 is poured, if the inner side length of the special-shaped retaining wall 2 is smaller than the distance between piles, the net-sprayed concrete treatment is required to be adopted on the surface of the retaining wall in time, and the inner surface of the foundation pit support structure is ensured to be smooth.
Step four: in the process of foundation pit excavation, along with the pouring of the abnormal-shaped retaining wall 2, the inner support at the corresponding position is erected while excavation is carried out until the bottom 6 of the foundation pit.
Step five: and (3) continuing the groove-drawing excavation along the inner side of the fender post 1, wherein the specific plane dimension and depth of the groove-drawing is determined according to the dimension of the retaining wall convex foot 3, and the retaining wall convex foot 3 and the last mould special-shaped retaining wall 2 are integrally cast.
Step six: and constructing a plain concrete cushion layer at the bottom of the foundation pit, covering the retaining wall convex feet 3 at the top of the cushion layer, laying a waterproof layer and a fine aggregate concrete protective layer, and pouring a main structure. And finally, backfilling the upper part of the top plate of the main structure and performing earth surface recovery construction.
When the corresponding stratum in abnormal shape barricade 2 position between fender pile 1 excavates, may form certain super digging behind the stake, especially fender pile 1 center connection line outside region, outside stratum 4 can have certain loose region or local collapse, after 2 founds the mould and pours and accomplish in abnormal shape barricade, adopts pre-buried slip casting pipe 7 to carry out the slip casting processing in good time, ensures that 2 outside stratum 4 of abnormal shape barricade are closely knit.
Conventional stake siding wall structure utilizes the bar planting technique to accomplish the fender pile 2 and the connection of stake barricade, the utility model discloses heterotypic barricade 2 need not the bar planting with fender pile 1's connection and handles, and the contact site is convex rigid contact, and the whole anti lateral rigidity of foundation ditch is better with stability, more is favorable to the protection of the peripheral important building (structure) of foundation ditch.
The foundation pit fender pile 1 can adopt a conventional cast-in-situ bored pile, the process is mature, and the related equipment and other auxiliary facilities are conventional mechanical equipment; the steel bars, the waterproof concrete, the templates and the like adopted by the special-shaped retaining wall 2 and the retaining wall convex feet 3 are all conventional materials, and the steel bars adopt conventional thread steel bars.
The utility model has the advantages of stress analysis, simple design, simple and easy operation, low construction cost, simple and convenient process and easy quality control. The design parameters (inside and outside length of side, wall thickness) of abnormal-shaped barricade 2 can arrange in adjacent fender pile 1 according to foundation ditch side direction deformation control requirement and construction factor are nimble, thereby form the novel stake slab wall structure of whole interlock formula of compriseing abnormal-shaped barricade 2 and fender pile 1, abnormal-shaped barricade 2 and 3 monolithic concretions of barricade protruding foot, realize fender pile 1, the common atress of abnormal-shaped barricade 2 and the protruding foot 3 of barricade, it is good to have realized the wholeness, the big novel foundation ditch enclosure structure system of anti side rigidity, can effectively solve big buried depth, the deformation control and the environmental protection problem of the irregular foundation ditch in plane.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.

Claims (7)

1. The utility model provides a stake bulkhead structure based on heterotypic barricade rigid contact behind stake which characterized in that:
the pile-plate wall structure comprises a fender post (1) and a special-shaped retaining wall (2);
the fender posts (1) are cylindrical in cross section and arranged at intervals along the edge of the foundation pit, and the special-shaped retaining walls (2) are positioned between the adjacent fender posts (1); the inner side and the outer side of the special-shaped retaining wall (2) are vertical planes, the outer side is wide and the inner side is narrow, and the left side and the right side are concave arc surfaces and are closely attached to the outer wall of the fender post (1).
2. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 1, wherein:
the length direction of the inner side and the outer side of the special-shaped retaining wall (2) is parallel to the central connecting line of the fender pile (1), the inner side of the special-shaped retaining wall (2) is positioned at the inner side of the central connecting line of the fender pile (1), and the outer side of the special-shaped retaining wall (2) is tangent to the outer side wall of the fender pile (1).
3. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 2, wherein:
the bottom of the special-shaped retaining wall (2) is provided with a retaining wall convex foot (3) which is bent towards the inside of the foundation pit, the retaining wall convex foot (3) is horizontal and is vertical to the special-shaped retaining wall (2), and the retaining wall convex foot (3) is connected with the bottom of the special-shaped retaining wall (2) into a whole.
4. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 3, wherein:
the retaining wall convex foot (3) of the abnormal-shaped retaining wall (2) is positioned below the bottom surface of the foundation pit, and the top surface of the retaining wall convex foot (3) is flush with the bottom line (6) of the foundation pit.
5. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 4, wherein:
the special-shaped retaining wall (2) is in rigid contact with the fender post (1), and the contact surface is arc-shaped.
6. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 5, wherein:
the distance between the adjacent fender piles (1) is not more than twice of the pile diameter.
7. The pile-plate wall structure based on rigid contact of the post-pile profiled retaining wall as claimed in claim 6, wherein:
the fender pile (1), the special-shaped retaining wall (2) and the retaining wall convex foot (3) are all of reinforced concrete structures.
CN201922224123.4U 2019-12-12 2019-12-12 Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall Active CN211690359U (en)

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CN201922224123.4U CN211690359U (en) 2019-12-12 2019-12-12 Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922224123.4U CN211690359U (en) 2019-12-12 2019-12-12 Pile slab wall structure based on rigid contact of post-pile special-shaped retaining wall

Publications (1)

Publication Number Publication Date
CN211690359U true CN211690359U (en) 2020-10-16

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