CN115492128B - Variable cross section ground wall supporting method for junction of standard section and end well of foundation pit - Google Patents

Variable cross section ground wall supporting method for junction of standard section and end well of foundation pit Download PDF

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Publication number
CN115492128B
CN115492128B CN202211337846.5A CN202211337846A CN115492128B CN 115492128 B CN115492128 B CN 115492128B CN 202211337846 A CN202211337846 A CN 202211337846A CN 115492128 B CN115492128 B CN 115492128B
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section
steel
ground wall
junction
foundation pit
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CN115492128A (en
Inventor
胡锦
金毅
何亚飞
葛欣铭
翟杰群
李操
高林波
蒋伟林
周蓉峰
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Shanghai Mechanized Construction Group Co Ltd
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Shanghai Mechanized Construction Group Co Ltd
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Priority to CN202211337846.5A priority Critical patent/CN115492128B/en
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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
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • 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
    • E02D5/74Means for anchoring structural elements or bulkheads

Abstract

The invention relates to the technical field of foundation pit engineering, and discloses a variable cross-section ground wall supporting method for the junction of a standard section of a foundation pit and an end well. Pouring a bottom plate at the junction of the standard section of the foundation pit and the end well; excavating end section pits at two ends of a reserved area of the lower deep beam; the method comprises the steps of (1) reserving a steel purlin on a ground wall and arranging the steel purlin at the position of the steel purlin; an inclined support is erected in the pit of the end section, one end of the inclined support is anchored into the bottom plate, and the other end of the inclined support is connected with a steel enclosing purlin on the ground wall; pouring an end section lower deep beam in the end section pit, and reserving end section steel bars with preset lengths; excavating a middle section pit in the middle of the reserved area of the lower deep beam; welding a middle section of reinforcing steel bar on the reserved end section of reinforcing steel bar; and pouring the middle section lower deep beam in the middle section pit, and splicing the middle section lower deep beam and the end section lower deep beams at two ends of the middle section lower deep beam into a whole section of lower deep beam for supporting the ground wall. The invention adopts a construction mode of sectionally excavating the pit and sectionally pouring the lower deep beam, and has good supporting effect.

Description

Variable cross section ground wall supporting method for junction of standard section and end well of foundation pit
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a method for supporting a variable cross section ground wall at the junction of a standard section of a foundation pit and an end well.
Background
Along with the acceleration of the urban construction process, the scale of urban rail transit construction mainly comprising subway construction is gradually enlarged so as to relieve the pressure of urban road traffic congestion. The end well is a 'well' built at one end of a shield entering and exiting when the shield construction is adopted, and is not only a working well for the shield construction, but also a part of a house for subway station equipment.
In the subway foundation pit engineering excavation process, because the ground wall at the junction of the standard section of the foundation pit and the end well is of a variable cross-section structure, the unbalanced stress of the ground wall easily causes deformation, and the deformation of the ground wall in the end well excavation process can cause great potential safety hazard.
Disclosure of Invention
Based on the problems, the invention aims to provide a method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, which has good supporting effect, safety and reliability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for supporting a variable cross-section ground wall at the junction of a standard section of a foundation pit and an end well comprises the following steps:
s1, pouring a bottom plate at the junction of a standard section of a foundation pit and an end well;
s2, excavating end section pits at two ends of the reserved area of the lower deep beam;
s3, reserving a steel purlin on the ground wall, and arranging the steel purlin at the position of the steel purlin;
s4, erecting an inclined support in the pit of the end section, wherein one end of the inclined support is anchored into the bottom plate, and the other end of the inclined support is connected with a steel enclosing purlin on the ground wall;
s5, pouring the end section lower deep beam in the end section pit, and reserving end section steel bars with preset lengths;
s6, excavating a middle section pit in the middle of the reserved area of the lower deep beam;
s7, welding an intermediate section of reinforcing steel bar on the reserved end section of reinforcing steel bar;
s8, pouring the middle section lower deep beam in the middle section pit, and splicing the middle section lower deep beam and the end section lower deep beams at two ends of the middle section lower deep beam into a whole section of lower deep beam for supporting the ground wall.
As an alternative scheme of the variable cross section ground wall supporting method at the junction of the standard section of the foundation pit and the end well, the length of the inclined support anchored into the bottom plate is not less than 1 meter.
As an alternative scheme of the method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, the inclined support is anchored into a reserved reinforcement cage of the bottom plate.
As an alternative scheme of the method for supporting the variable cross section ground wall at the junction of the standard section of the foundation pit and the end well, the central line of the inclined support is level with the central line of the bottom plate.
As an alternative scheme of the method for supporting the variable cross section ground wall at the junction of the standard section of the foundation pit and the end well, the inclined support is welded with the steel purlin.
As an alternative scheme of the method for supporting the variable cross section ground wall at the junction of the standard section of the foundation pit and the end well, the included angle between the inclined support and the steel purlin is 30-60 degrees.
As an alternative scheme of the method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, the steel purlin is in a strip shape.
As an alternative scheme of the method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, at least two inclined supports are arranged in parallel.
As an alternative scheme of the method for supporting the variable cross section ground wall at the junction of the standard section of the foundation pit and the end well, the diagonal support adopts double-spliced steel of H-steel.
As an alternative scheme of the variable cross-section ground wall supporting method at the junction of the standard section of the foundation pit and the end well, the cross-section height h=700 mm of the H-shaped steel; flange width b=300 mm of H-section steel; web thickness t1=13 mm of H-section steel; flange thickness t2=24 mm of the H-section steel.
The beneficial effects of the invention are as follows:
according to the method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, firstly, a bottom plate is poured at the junction of the standard section of the foundation pit and the end well; then, excavating end section pits at two ends of the reserved area of the lower deep beam; then, reserving a steel purlin on the ground wall, and arranging the steel purlin; then, erecting an inclined support in the pit of the end section, wherein one end of the inclined support is anchored in the bottom plate, and the other end of the inclined support is connected with a steel enclosing purlin on the ground wall; then, pouring the end section lower deep beam in the end section pit, and reserving end section steel bars with preset lengths; then, excavating a middle section pit in the middle of the reserved area of the lower deep beam; then, welding an intermediate section of reinforcing steel bar on the reserved end section of reinforcing steel bar; and finally, pouring the middle section lower deep beam in the middle section pit, and splicing the middle section lower deep beam and the end section lower deep beams at the two ends into a whole section of lower deep beam for supporting the ground wall. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well adopts a construction mode of sectionally excavating a pit and sectionally pouring a lower deep beam, has good supporting effect, is safe and reliable, avoids deformation caused by unbalanced stress of the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well in the excavating process of the end well, and reduces the risk brought by the fact that the excavation of the foundation pit is not completed and the support is formed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a flow chart of a method for supporting a variable cross-section earth wall at the junction of a standard section of a foundation pit and an end well according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a method for supporting a variable cross-section earth wall at the junction of a standard section of a foundation pit and an end well according to an embodiment of the present invention during construction;
fig. 3 is a schematic cross-sectional view of a method for supporting a variable cross-section earth wall at the junction of a standard section of a foundation pit and an end well according to an embodiment of the present invention during construction.
In the figure:
1. a bottom plate; 2. an end section pit; 3. steel purlin; 4. a diagonal support; 5. end section steel bars; 6. a middle section pit; 7. a middle section of steel bar;
100. a standard section; 200. a tip well; 300. and (3) a ground wall.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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 fall within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 3, the present embodiment provides a method for supporting a variable cross-section earth wall at a junction between a standard section of a foundation pit and a tip well, the method for supporting a variable cross-section earth wall at a junction between a standard section of a foundation pit and a tip well includes the following steps:
s1, pouring a bottom plate 1 at the junction of a foundation pit standard section 100 and an end well 200;
s2, excavating end section pits 2 at two ends of a reserved area of the lower deep beam;
s3, reserving a steel purlin 3 on the ground wall 300, and arranging the steel purlin 3 at the position of the steel purlin 3;
s4, erecting an inclined support 4 in the end section pit 2, wherein one end of the inclined support 4 is anchored into the bottom plate 1, and the other end of the inclined support 4 is connected with a steel enclosing purlin 3 on the ground wall 300;
s5, pouring the end section lower deep beam in the end section pit 2, and reserving end section steel bars 5 with preset lengths;
s6, excavating a middle section pit 6 in the middle of the reserved area of the lower deep beam;
s7, welding an intermediate section of reinforcing steel bar 7 on the reserved end section of reinforcing steel bar 5;
s8, pouring the middle section lower deep beam in the middle section pit 6, and splicing the middle section lower deep beam and the end section lower deep beams at two ends of the middle section lower deep beam into a whole section of lower deep beam for supporting the ground wall 300.
The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well adopts a construction mode of sectionally excavating a pit and sectionally pouring a lower deep beam, has good supporting effect, is safe and reliable, avoids deformation caused by unbalanced stress of the variable cross-section ground wall 300 at the junction of the standard section 100 of the foundation pit and the end well 200 in the excavating process of the end well 200, and reduces the risk brought by the fact that the excavation of the foundation pit is not completed and the support is formed. Even if the width of the end well 200 is too large, the supporting length is long, and the method for supporting the variable cross section ground wall at the junction of the standard section of the foundation pit and the end well can also have a good supporting effect.
To ensure the connection strength of the diagonal support 4 to the base plate 1, the diagonal support 4 is optionally anchored to the base plate 1 with a length of not less than 1 meter. To further ensure the strength of the connection of the diagonal support 4 to the base plate 1, the diagonal support 4 is optionally anchored in a preformed reinforcement cage of the base plate 1. To ensure that the floor 300 is stressed evenly, the center line of the diagonal support 4 is optionally positioned flush with the center line of the floor 1.
To facilitate field construction, the diagonal brace 4 is optionally welded to the steel purlin 3. Because the welding is the connection between metal atoms, the rigidity is large, the overall performance is good, and the welding can also connect different shapes and sizes and even different materials, thereby achieving the purposes of reducing weight, saving materials, optimizing resources and the like.
To ensure reasonable stress on the ground wall 300, the inclined support 4 and the steel purlin 3 can optionally have an included angle ranging from 30 ° to 60 °. To ensure that the ground wall 300 is stressed equally, optionally, the diagonal braces 4 are arranged in parallel with at least two. For convenience, the steel purlin 3 is connected with a plurality of inclined supports 4 at the same time, and optionally, the steel purlin 3 is in a long strip shape.
To ensure that the diagonal support 4 has sufficient support strength, the diagonal support 4 may alternatively be a double-spliced H-section steel. The double-spliced steel is formed by splicing and welding two steel sections with the same specification, and the inclined support 4 is formed by splicing and welding two H-shaped steel sections with the same specification. To ensure the structural strength of the H-section steel, optionally, the section height h=700 mm of the H-section steel; flange width b=300 mm of H-section steel; web thickness t1=13 mm of H-section steel; flange thickness t2=24 mm of the H-section steel.
According to the method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well, firstly, a bottom plate 1 is poured at the junction of the standard section 100 of the foundation pit and the end well 200; then, excavating end section pits 2 at two ends of the reserved area of the lower deep beam; then, reserving the position of the steel purlin 3 on the ground wall 300 and arranging the steel purlin 3; then, an inclined support 4 is erected in the end section pit 2, one end of the inclined support 4 is anchored into the bottom plate 1, and the other end of the inclined support 4 is connected with a steel enclosing purlin 3 on the ground wall 300; then, pouring the end section lower deep beam in the end section pit 2, and reserving end section steel bars 5 with preset lengths; next, excavating a middle section pit 6 at the middle of the reserved area of the lower deep beam; then, welding an intermediate section of reinforcing steel bar 7 on the reserved end section of reinforcing steel bar 5; finally, pouring the middle section lower deep beam in the middle section pit 6, and splicing the middle section lower deep beam and the end section lower deep beams at the two ends into a whole section of lower deep beam for supporting the ground wall 300. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well adopts a construction mode of sectionally excavating a pit and sectionally pouring a lower deep beam, has good supporting effect, is safe and reliable, avoids deformation caused by unbalanced stress of the variable cross-section ground wall 300 at the junction of the standard section 100 of the foundation pit and the end well 200 in the excavating process of the end well 200, and reduces the risk brought by the fact that the excavation of the foundation pit is not completed and the support is formed.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well is characterized by comprising the following steps of:
s1, pouring a bottom plate (1) at the junction of a foundation pit standard section (100) and an end well (200);
s2, excavating end section pits (2) at two ends of a reserved area of the lower deep beam, wherein the area between the end well (200) and the bottom plate (1) is the reserved area of the lower deep beam;
s3, reserving a steel enclosing purlin (3) on the ground wall (300), and arranging the steel enclosing purlin (3);
s4, erecting an inclined support (4) in the end section pit (2), wherein one end of the inclined support (4) is anchored into the bottom plate (1), and the other end of the inclined support (4) is connected with a steel purlin (3) on the ground wall (300);
s5, pouring an end section lower deep beam in the end section deep pit (2), and reserving end section steel bars (5) with preset lengths;
s6, excavating a middle section pit (6) at the middle of the reserved area of the lower deep beam;
s7, welding a middle section of steel bar (7) on the reserved end section of steel bar (5);
s8, pouring the middle section lower deep beam in the middle section pit (6), and splicing the middle section lower deep beam and the end section lower deep beams at two ends into a whole section of lower deep beam for supporting the ground wall (300).
2. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the length of the inclined support (4) anchored into the bottom plate (1) is not less than 1 meter.
3. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the diagonal brace (4) is anchored into a reserved reinforcement cage of the bottom plate (1).
4. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the central line of the inclined support (4) is flush with the central line of the bottom plate (1).
5. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the inclined support (4) is welded with the steel purlin (3).
6. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the included angle between the inclined support (4) and the steel purlin (3) is 30-60 degrees.
7. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein the steel purlin (3) is in a long strip shape.
8. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 1, wherein at least two diagonal braces (4) are arranged in parallel.
9. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to any one of claims 1 to 8, wherein the diagonal support (4) is made of double-spliced steel of H-steel.
10. The method for supporting the variable cross-section ground wall at the junction of the standard section of the foundation pit and the end well according to claim 9, wherein the cross-section height h=700 mm of the H-shaped steel; flange width b=300 mm of H-section steel; web thickness t1=13 mm of H-section steel; flange thickness t2=24 mm of the H-section steel.
CN202211337846.5A 2022-10-28 2022-10-28 Variable cross section ground wall supporting method for junction of standard section and end well of foundation pit Active CN115492128B (en)

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