CN108442406B - Semi-reverse construction method foundation pit inner supporting structure and construction method thereof - Google Patents

Semi-reverse construction method foundation pit inner supporting structure and construction method thereof Download PDF

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Publication number
CN108442406B
CN108442406B CN201810274049.4A CN201810274049A CN108442406B CN 108442406 B CN108442406 B CN 108442406B CN 201810274049 A CN201810274049 A CN 201810274049A CN 108442406 B CN108442406 B CN 108442406B
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China
Prior art keywords
foundation pit
construction method
temporary
steel
column
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CN201810274049.4A
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CN108442406A (en
Inventor
任东兴
李耀家
彭涛
邓安
高晓峰
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CREEC Chengdu Survey Design and Research Co Ltd
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CREEC Chengdu Survey Design and Research Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • E02D29/055Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel

Abstract

The invention discloses a semi-reverse construction method foundation pit inner support structure and a construction method thereof, relates to the technical field of foundation pit construction, and is used for solving the problems that the inner support of a foundation pit is poor in stress effect and unstable in inner support structure. The invention comprises a foundation pit inner supporting structure of a semi-reverse construction method and a construction method thereof, wherein a temporary inner supporting on the side wall of a foundation pit is subjected to stress conversion through a bracket, and the force of the temporary inner supporting is transmitted to a main structure beam so as to ensure the stability of the inner supporting structure, the bracket adopts a steel column vertically, and adjacent horizontal brackets are connected through steel beams so as to ensure the stability of the bracket.

Description

Semi-reverse construction method foundation pit inner supporting structure and construction method thereof
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to an inner support structure of a foundation pit by a semi-reverse construction method and a construction method thereof.
Background
The semi-reverse construction method is a construction method commonly used in building construction, and the principle of the method is that an underground continuous wall or other supporting structures are firstly constructed along the axis or the periphery of a basement of a building, and meanwhile, middle supporting piles and columns are poured or driven down at relevant positions inside the building and are used as supports for bearing the self weight and the construction load of an upper structure before the bottom plate is sealed during construction. And then constructing a beam slab floor structure on the ground layer by layer to serve as a support with high rigidity for the underground continuous wall, and then excavating earthwork downwards layer by layer and pouring underground structures on each layer until the bottom plate is sealed.
In the excavation process of the foundation pit, the plane size of the foundation pit is designed, a diagonal brace, an angle brace and the like are adopted, the inner supporting member is long, the stress effect is poor, and the inner supporting structure is unstable.
Disclosure of Invention
The invention aims to: the invention provides a semi-reverse construction method foundation pit inner support structure and a construction method thereof, aiming at solving the problems that an inner support of a foundation pit is poor in stress effect and unstable in inner support structure.
The invention specifically adopts the following technical scheme for realizing the purpose:
the utility model provides a semi-reverse construction method foundation ditch inner support structure, is including the permanent structure post that highly is higher than the floor elevation that is located foundation ditch one side its characterized in that permanent structure post is provided with interim steel column along foundation ditch width direction, is provided with a plurality of interim steel columns at the foundation ditch along length direction, is connected with the tie-beam between each interim steel column and the permanent structure post, interim steel column is provided with interim cap, interim cap upper end is provided with the bracket, the bracket is connected with interior supporting beam, interior supporting beam is connected with the foundation ditch inner wall.
Preferably, the connection beam comprises a temporary structural beam above the floor elevation and a permanent structural beam below the floor elevation, when the temporary steel column is removed, only the temporary structural beam above the floor elevation is removed, and the permanent structural beam below the temporary structural beam is reserved, so that a supporting effect on the floor is achieved.
Preferably, the bracket is made in a reinforced concrete pouring mode, and has the advantages of being firm, durable, good in fireproof performance, saving steel compared with a steel structure and low in cost.
Preferably, a steel beam is arranged between the adjacent temporary steel columns along the length direction of the foundation pit, and the stable shape of the bracket is guaranteed.
A construction method of a semi-reverse construction method foundation pit inner support structure is characterized by comprising the following steps:
pouring a permanent structural column close to the edge of a foundation pit in a main structure outside a pre-excavated foundation pit area;
determining the relative position of the temporary steel column and the permanent structural column, extending the temporary steel column into the soil in a drilling pile mode, pouring and anchoring the bottom by concrete, and backfilling and compacting by using earthwork when the strength of the concrete anchored at the bottom is enough;
determining the position of a temporary column cap on the temporary steel column according to the position of the floor elevation, pre-embedding steel bars on the temporary column cap in a typical reinforcement arrangement mode, connecting a connecting beam with a permanent structural column in a reinforcement arrangement mode, hooping the permanent structural column by the reinforcement arrangement of the connecting beam, erecting bracket reinforcement at the upper end of the temporary column cap, connecting the bracket reinforcement with an inner supporting beam, sequentially arranging a first layer of supporting reinforcement, a second layer of supporting reinforcement and a third layer of supporting reinforcement from top to bottom on the inner supporting beam, and after the reinforcement arrangement is finished, after all the reinforcement arrangements are finished, performing subsection direct casting molding;
fourthly, arranging steel beams on the brackets on the adjacent steel columns arranged along the length direction of the foundation pit, arranging fixed connecting plates on the side walls of the brackets, and connecting two ends of each steel beam to the fixed connecting plates;
fifthly, building the building after the inner support structure reaches the design strength.
Preferably, the bracket adopts the form of vertical steel column, guarantees the stability of bracket.
Preferably, a steel plate for separating the connecting beam from the permanent structural beam is arranged between the reinforcing bars of the connecting beam and the permanent structural beam in the third step.
The invention has the following beneficial effects:
1. according to the invention, the temporary inner support on the side wall of the foundation pit is subjected to stress conversion through the bracket, and the temporary inner support force is transmitted to the main structure beam, so that the stability of the inner support structure is ensured, and the potential safety hazard caused by collapse due to unstable inner support structure is avoided.
2. The tie-beam is including being located the temporary structure roof beam of floor elevation top and being located the permanent structure roof beam of floor elevation below, when demolising interim steel column, only will be located the temporary structure roof beam of floor elevation top and demolish, and the permanent structure roof beam of below then remains, plays a supporting role to the floor.
3. The bracket is vertical to adopt the form of steel column to connect through the girder steel between the adjacent horizontal bracket, make the stability of bracket obtain guaranteeing.
4. An inner supporting beam is made of reinforced concrete, the rigidity is high, the integrity is good, the arrangement of the temporary steel piles is flexible, the inner supporting beam is suitable for foundation pits with different shapes, foundation pit displacement cannot be caused due to loosening of nodes, and the construction quality is easy to guarantee.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a connection structure of adjacent temporary steel columns through steel beams;
FIG. 3 is a schematic view of an exemplary reinforcement structure for a temporary cap;
FIG. 4 is a schematic view of a connection amount reinforcing bar structure;
FIG. 5 is a schematic diagram of a first layer of support reinforcing bar structure of the inner support beam;
FIG. 6 is a schematic view of the second and third layers of support reinforcing bars of the inner support beam;
reference numerals: 1-floor elevation, 2-permanent structural columns, 3-connecting beams, 4-permanent structural beams, 5-temporary structural beams, 6-corbels, 7-temporary steel columns, 8-temporary column caps, 9-inner supporting beams, 10-connecting plates, 11-steel beams and 12-steel plates.
Detailed Description
For a better understanding of the present invention by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and the following examples.
Support structure in semi-reverse construction method foundation ditch includes a plurality of permanent structure posts that are located the foundation ditch side and are higher than the floor elevation, still is provided with the interim steel column of a plurality of and permanent structure post one-to-one in the foundation ditch, and interim steel column is provided with interim cap, and interim cap upper end is provided with the bracket, is connected through the connection beam between one side of bracket and the permanent structure post, and the opposite side of bracket still is connected with the interior support beam of being connected with the foundation ditch inner wall.
Preferably, the coupling beams include temporary structural beams above the floor level and permanent structural beams below the floor level.
Preferably, the bracket is made in a form of reinforced concrete pouring.
Preferably, a steel beam is arranged between the adjacent temporary steel columns along the length direction of the foundation pit.
The construction method of the inner support structure of the foundation pit by the semi-reverse construction method comprises the following steps:
pouring a permanent structural column close to the edge of a foundation pit in a main structure outside a pre-excavated foundation pit area;
determining the relative position of the temporary steel column and the permanent structural column, extending the temporary steel column into the soil in a drilling pile mode, pouring and anchoring the bottom by concrete, and backfilling and compacting by using earthwork when the strength of the concrete anchored at the bottom is enough;
determining the position of a temporary column cap on the temporary steel column according to the position of the floor elevation, pre-embedding steel bars on the temporary column cap in a typical reinforcement arrangement mode, connecting a connecting beam with a permanent structural column in a reinforcement arrangement mode, hooping the permanent structural column by the reinforcement arrangement of the connecting beam, erecting bracket reinforcement at the upper end of the temporary column cap, connecting the bracket reinforcement with an inner supporting beam, sequentially arranging a first layer of supporting reinforcement, a second layer of supporting reinforcement and a third layer of supporting reinforcement from top to bottom on the inner supporting beam, and after the reinforcement arrangement is finished, carrying out sectional on-site direct casting molding after all the reinforcement arrangements are finished;
fourthly, arranging steel beams on the brackets on the adjacent steel columns arranged along the length direction of the foundation pit, arranging fixed connecting plates on the side walls of the brackets, and connecting two ends of each steel beam to the fixed connecting plates;
fifthly, building the building after the inner support structure reaches the design strength.
Preferably, the corbels are in the form of vertical steel columns.
Preferably, a steel plate for separating the connecting beam from the permanent structural beam is arranged between the reinforcing bars of the connecting beam and the permanent structural beam in the third step.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.

Claims (6)

1. A semi-reverse construction method foundation pit inner supporting structure comprises a plurality of permanent structural columns (2) which are located on the side faces of a foundation pit and are higher than a floor elevation (1), and is characterized in that a plurality of temporary steel columns (7) which correspond to the permanent structural columns (2) one by one are further arranged in the foundation pit, each temporary steel column (7) is provided with a temporary column cap (8), a bracket (6) is arranged at the upper end of each temporary column cap (8), one side of each bracket (6) is connected with the corresponding permanent structural column (2) through a connecting beam (3), and the other side of each bracket (6) is further connected with an inner supporting beam (9) connected with the inner wall of the foundation pit;
the connecting beam comprises a temporary structural beam (5) positioned above the floor elevation (1) and a permanent structural beam (4) positioned below the floor elevation (1).
2. The support structure in a foundation pit by using a semi-reverse construction method according to claim 1, characterized in that the bracket (6) is made in the form of reinforced concrete pouring.
3. The support structure in the foundation pit by the semi-reverse construction method according to claim 1, wherein a steel beam (11) is arranged between the adjacent temporary steel columns (7) along the length direction of the foundation pit.
4. A construction method of a semi-reverse construction method foundation pit inner support structure is characterized by comprising the following steps:
firstly, pouring a permanent structural column (2) outside a pre-dug foundation pit area, wherein the main structure is close to the edge of the foundation pit;
determining the relative position of the temporary steel column (7) and the permanent structural column (2), extending the temporary steel column into the soil in a drilling pile mode, pouring concrete at the bottom for anchoring, and backfilling and compacting by using earthwork when the strength of the concrete anchored at the bottom is enough;
determining the position of a temporary column cap (8) on a temporary steel column (7) according to the position of a floor elevation (1), embedding steel bars in the temporary column cap (8) in a typical reinforcement arrangement mode, connecting a connecting beam with a permanent structural column (2) in a reinforcement arrangement mode, hooping the permanent structural column (2) by the reinforcement arrangement of the connecting beam, erecting a bracket (6) reinforcement arrangement at the upper end of the temporary column cap (8), connecting the bracket (6) reinforcement arrangement with an inner supporting beam (9), sequentially arranging a first layer of supporting reinforcement arrangement, a second layer of supporting reinforcement and a third layer of supporting reinforcement on the inner supporting beam (9) from top to bottom, and after the reinforcement arrangement is finished, carrying out subsection field direct casting molding after all the reinforcement arrangements are finished;
fourthly, arranging steel beams (11) on the brackets (6) on the adjacent steel columns arranged along the length direction of the foundation pit, arranging fixed connecting plates (10) on the side walls of the brackets (6), and connecting two ends of each steel beam (11) to the fixed connecting plates (10);
fifthly, building the building after the inner support structure reaches the design strength.
5. The construction method of the support structure in the foundation pit by the semi-reverse construction method according to claim 4, characterized in that the bracket (6) is in the form of a vertical steel column.
6. The construction method of the support structure in the foundation pit by the semi-reverse construction method according to claim 4, wherein a steel plate (12) for separating the connecting beam from the permanent structural beam (4) is arranged between the reinforcing bars of the connecting beam and the permanent structural beam (4) in the step (iii).
CN201810274049.4A 2018-03-29 2018-03-29 Semi-reverse construction method foundation pit inner supporting structure and construction method thereof Active CN108442406B (en)

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CN108442406B true CN108442406B (en) 2020-10-13

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102995659A (en) * 2012-12-03 2013-03-27 杭州南联地基基础工程有限公司 Method for constructing from central area to periphery of ultra-large type underground engineering

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201151909Y (en) * 2007-11-15 2008-11-19 王平 Deep pit composite structure annular inner support
CN105089061B (en) * 2015-08-11 2017-01-18 泰兴市第一建筑安装工程有限公司 Ultra-deep foundation pit supporting method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102995659A (en) * 2012-12-03 2013-03-27 杭州南联地基基础工程有限公司 Method for constructing from central area to periphery of ultra-large type underground engineering

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