CN107023019B - Concrete-assembled steel mixed enclosing purlin in foundation pit supporting structure and construction method thereof - Google Patents
Concrete-assembled steel mixed enclosing purlin in foundation pit supporting structure and construction method thereof Download PDFInfo
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- CN107023019B CN107023019B CN201710136885.1A CN201710136885A CN107023019B CN 107023019 B CN107023019 B CN 107023019B CN 201710136885 A CN201710136885 A CN 201710136885A CN 107023019 B CN107023019 B CN 107023019B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 113
- 239000010959 steel Substances 0.000 title claims abstract description 113
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 128
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims description 18
- 238000004873 anchoring Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 239000002131 composite material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
- Artificial Fish Reefs (AREA)
Abstract
The invention relates to a concrete-assembled type steel mixed enclosing purlin in a foundation pit supporting structure and a construction method thereof, wherein an enclosing structure is arranged around a foundation pit, the enclosing purlin comprises a concrete enclosing purlin which is arranged on the enclosing structure and is close to the inner side of the foundation pit, and a horizontally arranged force transmission component is arranged at the joint of the concrete enclosing purlin and the enclosing structure; the first end of the force transfer component is fixedly connected with the enclosure structure; the second end of the force transfer component opposite to the first end is anchored in the concrete enclosing purlin in a mode of intersecting with the axial force direction of the concrete enclosing purlin, and the axial force of the concrete enclosing purlin is transferred to the enclosing structure through the force transfer component. According to the invention, the force transfer component is arranged at the joint of the concrete enclosing purlin and the enclosing structure, and the axial force of the concrete enclosing purlin is transferred to the enclosing structure by the force transfer component, so that the axial force born by the concrete enclosing purlin and the steel enclosing purlin is reduced, and the stress condition of the supporting structure is optimized.
Description
Technical Field
The invention relates to the field of foundation pit support in building construction, in particular to a concrete-assembled steel mixed enclosing purlin in a foundation pit support structure and a construction method thereof.
Background
In foundation pit engineering, the foundation pit ensures the stability in the foundation pit construction process through the foundation pit supporting structure that sets up. As shown in fig. 1 and 2, the foundation pit supporting structure comprises an enclosure structure 11 arranged in a soil body 10 at the periphery of the foundation pit and an enclosure purlin 12 arranged on the enclosure structure 11 and close to the inner side of the foundation pit, so that the effect of reinforcing the soil body to ensure the stability of the foundation pit is achieved. Typically, the enclosure 11 employs triaxial mixing piles 111 with steel members 112, i.e., SMW piles. The enclosing purlin 12 adopts reinforced concrete enclosing purlin, the reinforced concrete enclosing purlin and the enclosing structure 11 adopt hanging ribs 13 to realize force transmission connection, the middle part of each hanging rib 13 is an inclined section, two ends are vertical sections connected with the inclined sections, one vertical section and part of the inclined sections are inserted into a triaxial mixing pile 111 and fixedly connected with a section steel member 112, the other vertical section and part of the inclined sections are buried into the concrete enclosing purlin 12, and the dead weight of the concrete enclosing purlin and the vertical load born by the enclosing purlin are balanced through the hanging ribs 13. By the arrangement mode, the axial pressure born by the concrete surrounding purlin is large, and the stress stability of the supporting structure is affected. Furthermore, under the condition that the enclosing purlin adopts steel enclosing purlin and concrete enclosing purlin to combine together, because the axial pressure of the concrete enclosing purlin is very big, can lead to the steel to enclose the cross-section of purlin also very big, increased the material cost, also increased and strutted the degree of difficulty.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a concrete-assembled steel mixed enclosing purlin in a foundation pit supporting structure and a construction method thereof, and solves the problems that the axial pressure born by the enclosing purlin greatly influences the stability of the supporting structure due to the arrangement mode of the enclosing purlin in the prior art and the section of the steel enclosing purlin is large due to the large axial pressure so as to increase the material cost and the supporting difficulty.
The technical scheme for achieving the purpose is as follows:
the invention provides a construction method of a concrete-assembled type steel mixed enclosing purlin in a foundation pit supporting structure, which comprises the following steps:
constructing an enclosure structure around the set position of the foundation pit;
constructing a foundation pit; and
constructing a concrete enclosing purlin on the enclosing structure close to the inner side of the foundation pit;
when the concrete enclosing purlin is constructed, a force transmission component is arranged at the joint of the enclosing structure and the concrete enclosing purlin;
fixedly connecting a first end of the force transfer member with the enclosure;
and anchoring a second end of the force transfer member opposite to the first end in the concrete enclosing purlin in a manner intersecting with the axial force direction of the concrete enclosing purlin, and transmitting the axial force of the concrete enclosing purlin to the enclosure structure through the force transfer member.
According to the invention, the force transfer component is arranged at the joint of the concrete enclosing purlin and the enclosing structure, the axial force of the concrete enclosing purlin is transferred to the enclosing structure by the force transfer component, so that the axial force born by the concrete enclosing purlin is reduced, the pressure at the joint of the concrete enclosing purlin and the enclosing structure is relieved, the stress condition of the supporting structure is optimized, the stability of the supporting structure is ensured, and the safety of foundation pit supporting is ensured. Under the condition that the axial force born by the concrete enclosing purlin is reduced, the section size of the steel enclosing purlin can be naturally reduced due to the reduction of the axial force under the condition that the steel enclosing purlin and the concrete enclosing purlin are combined, so that the supporting structural material is saved, and the cost and the supporting difficulty are reduced.
The construction method of the concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the enclosing structure is a triaxial stirring pile, and a section steel member is inserted in the triaxial stirring pile;
fixedly connecting the first end of the force transfer member to the enclosure comprises:
and inserting the first end of the force transfer component into the triaxial stirring pile and fixedly connecting the force transfer component with the profile steel piece.
The invention relates to a construction method of a concrete-assembled steel mixed enclosing purlin in a foundation pit supporting structure, which is further improved in that the construction method further comprises the following steps:
and erecting a steel enclosing purlin on the inner side of the enclosing structure, which is close to the foundation pit, and connecting the steel enclosing purlin with the corresponding concrete enclosing purlin in a butt joint manner.
The construction method of the concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved, and the construction method further comprises the following steps:
providing a connecting hanging rib, and inserting a first end of the connecting hanging rib into the triaxial stirring pile and fixedly connecting the connecting hanging rib with the profile steel piece;
and anchoring the second end, opposite to the first end, of the connecting hanging bar in the concrete enclosing purlin in a vertical mode, and then transmitting the vertical load of the concrete enclosing purlin to the enclosing structure through the connecting hanging bar.
The construction method of the concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the force transfer component is a horizontal oblique steel bar.
The invention also provides a concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure, an enclosing structure is arranged around the foundation pit, the enclosing purlin comprises a concrete enclosing purlin which is arranged on the enclosing structure and is close to the inner side of the foundation pit, and a horizontally arranged force transmission component is arranged at the joint of the concrete enclosing purlin and the enclosing structure;
the first end of the force transfer component is fixedly connected with the enclosure structure;
the second end of the force transfer component opposite to the first end is anchored in the concrete enclosing purlin in a mode of intersecting with the axial force direction of the concrete enclosing purlin, and the axial force of the concrete enclosing purlin is transferred to the enclosing structure through the force transfer component.
The concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the enclosing structure is a triaxial stirring pile, and a steel member is inserted in the triaxial stirring pile;
the first end of the force transfer component is inserted into the triaxial mixing pile and fixedly connected with the profile steel piece.
The concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the concrete-assembled steel mixed enclosing purlin also comprises a steel enclosing purlin which is supported on the enclosing structure and is close to the inner side of a foundation pit, and the steel enclosing purlin is in butt joint connection with the corresponding concrete enclosing purlin.
The concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the concrete-assembled steel mixed enclosing purlin further comprises connecting hanging ribs which are arranged at the joint of the concrete enclosing purlin and the enclosing structure;
the first end of the connecting hanging bar is inserted into the triaxial stirring pile and fixedly connected with the profile steel piece;
the second end of the connecting hanging bar opposite to the first end is anchored in the concrete enclosing purlin in a vertical mode, and then vertical load of the concrete enclosing purlin is transferred to the enclosing structure through the connecting hanging bar.
The concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is further improved in that the force transfer component is a horizontal oblique steel bar.
Drawings
Fig. 1 is a schematic structural view of an enclosure and a concrete purlin in a foundation pit supporting structure in the prior art.
Fig. 2 is a cross-sectional view A-A of fig. 1.
FIG. 3 is a cross-sectional view of an enclosure and an enclosure in a foundation pit support structure of the present invention.
Fig. 4 is a sectional view of B-B in fig. 3.
Fig. 5 is a cross-sectional view of fig. 3C-C.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 3, the invention provides a concrete-assembled steel mixed enclosing purlin in a foundation pit supporting structure and a construction method thereof, wherein the enclosing purlin comprises a concrete enclosing purlin, a horizontal force transmission component is added for the concrete enclosing purlin, the force transmission component is arranged at the joint of the concrete enclosing purlin and the enclosing structure, the axial pressure born by the concrete enclosing purlin is transmitted to the enclosing structure through the force transmission component, the axial force born by the concrete enclosing purlin can be reduced, the axial force born by the concrete enclosing purlin is further reduced, and the axial force born by the concrete enclosing purlin and the steel enclosing purlin are reduced, so that the section size of the steel enclosing purlin can be naturally reduced. The force transmission component is arranged in the invention, so that the stress condition of the supporting structure is optimized, and the material cost of the supporting structure is saved. The concrete-assembled type steel mixed enclosing purlin in the foundation pit supporting structure and the construction method thereof are described below with reference to the accompanying drawings.
As shown in fig. 3, a concrete-fabricated type steel mixed enclosing purlin in the foundation pit supporting structure provided by the invention is arranged on an enclosing structure 21 of a foundation pit, the enclosing structure 21 is arranged in soil body around the foundation pit, the enclosing purlin comprises a concrete enclosing purlin 22 arranged on the enclosing structure 21 and close to the inner side of the foundation pit, a horizontally arranged force transmission member 24 is arranged at the joint of the concrete enclosing purlin 22 and the enclosing structure 21, the force transmission member 24 is provided with a first end 241 and a second end 242 which are opposite, the first end 241 of the force transmission member 24 is fixedly connected with the enclosing structure 21, and the second end 242 of the force transmission member 24 is anchored in the concrete enclosing purlin 22 in a mode of intersecting with the axial force direction F of the concrete enclosing purlin 22, wherein the axial force direction F is consistent with the trend direction of the concrete enclosing purlin 22. And in turn transmits the axial force of the concrete purlin 22 to the enclosure 21 via the force transfer member 24.
As shown in connection with fig. 3 and 4, the force-transmitting member 24 is disposed horizontally, and the portion of the force-transmitting member 24 buried in the concrete purlin 22 intersects the axial force direction of the concrete purlin 22, so that the force-transmitting member 24 has the ability to transmit axial force. The axial force of the concrete enclosing purlin 22 is transmitted to the enclosing structure through the force transmission component 24, so that the axial force born by the concrete enclosing purlin is reduced, the pressure at the joint of the concrete enclosing purlin and the enclosing structure is relieved, the stress condition of the supporting structure is optimized, and the stability of the supporting structure is ensured.
As a preferred embodiment of the present invention, as shown in fig. 3, the enclosure structure 21 is a triaxial mixing pile 211, and a section steel member 212 is inserted into the triaxial mixing pile 211. Preferably, the steel member 212 is H-section steel. When the enclosure 21 is constructed, one flange plate of the H-steel is disposed to face the inside of the foundation pit. The first end 241 of the force transfer member 24 is inserted into the triaxial mixing pile 211 and fixedly connected to the profile steel member 212. Preferably, the first end 241 of the force transfer member 24 is a horizontal segment that is attached to the flange plate of the H-beam and welded to the H-beam. The second end 242 of the force transfer member 24 is an inclined section, the end of the inclined section is connected with the end of the horizontal section, the inclined section is buried in the concrete enclosing purlin 22, the inclined section is arranged in an inclined manner, an included angle alpha is formed between the inclined section and the axis of the concrete enclosing purlin 22, and the included angle alpha only needs to meet the intersection of the inclined section and the axial force direction of the concrete enclosing purlin 22. Preferably, the angle α is 45 °.
As another preferred embodiment of the present invention, as shown in fig. 3 and 5, the enclosing purlin of the present invention further includes a steel enclosing purlin 23 supported on the enclosing structure 21 near the inner side of the foundation pit, and the steel enclosing purlin 23 is in butt connection with the corresponding concrete enclosing purlin 22. The axial pressure of the concrete enclosing purlin 22 is reduced due to the fact that the force transmission component 24 is arranged, so that the axial force transmitted to the steel enclosing purlin 23 by the concrete enclosing purlin 22 is also reduced greatly, and after the axial force of the steel enclosing purlin 23 is reduced, the section size of the steel enclosing purlin can be naturally reduced, so that the material of a supporting structure is saved, and the cost and the supporting difficulty are reduced. When the steel purlin 23 is erected, the steel purlin 23 is installed by adopting the support 26, the support 26 is fixed on the steel member 212 of the enclosure structure 21, the steel purlin 23 is supported by the support 26, and the support 26 is a triangular frame. The steel purlin 23 adopts double-spliced H-shaped steel, the end part of the steel purlin 23 abuts against the end part of the concrete purlin 22, the end part of the concrete purlin 22 is provided with a buried plate 221, and the end part of the steel purlin 23 abuts against the buried plate 221 and is fixedly connected with the buried plate 221.
As a further preferred embodiment of the present invention, as shown in fig. 3 and 4, the enclosing purlin of the present invention further comprises a connecting hanging bar 25 arranged at the connection between the concrete enclosing purlin 22 and the enclosing structure 21, wherein a first end 251 of the connecting hanging bar 25 is inserted into the triaxial stirring pile 211 of the enclosing structure 21 and fixedly connected with the profile steel member 212; a second end 252 of the connecting hanger bar 25 opposite the first end 251 is anchored vertically within the concrete purlin 22, thereby transmitting the vertical load of the concrete purlin 22 to the enclosure 21 through the connecting hanger bar 25. The vertical shape is a state disposed along the vertical direction F1. The connecting hanging bar 25 comprises an inclined section positioned in the middle and vertical sections positioned at two ends of the inclined section, the vertical section and part of the inclined section positioned at the first end 251 are inserted into the triaxial mixing pile 211, and the vertical section is fixedly connected with the steel member 212; the vertical and partially sloped sections at the second end 252 are inserted into the concrete purlin 22 with the vertical section of the second end 252 disposed vertically. The self weight of the concrete surrounding purlin 22 and the vertical load born by the concrete surrounding purlin 22 can be balanced through the connecting hanging ribs 25.
As a further preferred embodiment of the present invention, the force transfer member 25 is a horizontal oblique steel bar, and the horizontal oblique steel bar is disposed at the joint between the concrete enclosing purlin 22 and the enclosure structure 21, and the concrete enclosing purlin and the enclosure structure are tied by anchoring the horizontal oblique steel bar, so that on one hand, the horizontal oblique steel bar can improve the structural strength of the concrete enclosing purlin 22, and on the other hand, the horizontal oblique steel bar can transmit the axial force of the concrete enclosing purlin 22 to the enclosure structure, reduce the axial force on the concrete enclosing purlin 22, further reduce the axial pressure of the steel enclosing purlin, optimize the stress condition of the support structure, and ensure the stability and safety of the support structure.
The construction method of the concrete-assembled type steel mixed enclosing purlin in the foundation pit supporting structure provided by the invention is described below.
The construction method of the concrete-assembled type steel mixed enclosing purlin in the foundation pit supporting structure provided by the invention comprises the following steps: as shown in fig. 3, the enclosure structure 21 is constructed around the foundation pit setting position; constructing a foundation pit, along with excavation of earthwork of the foundation pit, constructing a concrete enclosing purlin 22 on the enclosing structure 21 close to the inner side of the foundation pit, wherein when constructing the concrete enclosing purlin 22, arranging a force transmission member 24 at the joint of the enclosing structure 21 and the concrete enclosing purlin 22, and fixedly connecting a first end 241 of the force transmission member 24 with the enclosing structure 21; a second end 242 of the force transfer member 24 opposite the first end 214 is anchored within the concrete purlin 22 in a manner intersecting the axial force direction of the concrete purlin 22, thereby transmitting the axial force of the concrete purlin 22 to the enclosure 21 through the force transfer member 24. Wherein the axial force direction F is consistent with the direction of the concrete purlin 22.
The invention arranges the force transfer component at the joint of the concrete enclosing purlin and the enclosing structure, horizontally arranges the force transfer component 24, and the part of the force transfer component 24 embedded in the concrete enclosing purlin 22 is intersected with the axial force direction of the concrete enclosing purlin 22, so that the force transfer component 24 has the capacity of transferring the axial force. The axial force of the concrete enclosing purlin is transmitted to the enclosure structure by the force transmission component, so that the axial force born by the concrete enclosing purlin is reduced, the pressure at the joint of the concrete enclosing purlin and the enclosure structure is relieved, the stress condition of the support structure is optimized, the stability of the support structure is ensured, and the safety of foundation pit support is ensured. Under the condition that the axial force born by the concrete enclosing purlin is reduced, the section size of the steel enclosing purlin can be naturally reduced due to the reduction of the axial force under the condition that the steel enclosing purlin and the concrete enclosing purlin are combined, so that the supporting structural material is saved, and the cost and the supporting difficulty are reduced.
As a preferred embodiment of the present invention, the enclosure structure 21 is a triaxial stirring pile 211, and the triaxial stirring pile 211 is internally provided with a section steel member 212; fixedly coupling the first end 241 of the force transfer member 24 to the enclosure 21 includes: the first end 241 of the force transfer member 24 is inserted into the triaxial mixing pile 211 and fixedly connected to the profile steel member 212. Preferably, the steel member 212 is H-section steel. When the enclosure 21 is constructed, one flange plate of the H-steel is disposed to face the inside of the foundation pit. The first end 241 of the force transfer member 24 is inserted into the triaxial mixing pile 211 and fixedly connected to the profile steel member 212. Preferably, the first end 241 of the force transfer member 24 is a horizontal segment that is attached to the flange plate of the H-beam and welded to the H-beam. The second end 242 of the force transfer member 24 is an inclined section, the end of the inclined section is connected with the end of the horizontal section, the inclined section is buried in the concrete enclosing purlin 22, the inclined section is arranged in an inclined manner, an included angle alpha is formed between the inclined section and the axis of the concrete enclosing purlin 22, and the included angle alpha only needs to meet the intersection of the inclined section and the axial force direction of the concrete enclosing purlin 22. Preferably, the angle α is 45 °.
As another preferred embodiment of the present invention, as shown in fig. 3 and 5, the construction method of the enclosing purlin of the present invention further includes supporting a steel enclosing purlin 23 on the enclosing structure 21 near the inner side of the foundation pit, and butt-connecting the steel enclosing purlin 23 with the corresponding concrete enclosing purlin 22. The axial pressure of the concrete enclosing purlin 22 is reduced due to the fact that the force transmission component 24 is arranged, so that the axial force transmitted to the steel enclosing purlin 23 by the concrete enclosing purlin 22 is also reduced greatly, and after the axial force of the steel enclosing purlin 23 is reduced, the section size of the steel enclosing purlin can be naturally reduced, so that the material of a supporting structure is saved, and the cost and the supporting difficulty are reduced. When the steel purlin 23 is erected, the steel purlin 23 is installed by adopting the support 26, the support 26 is fixed on the steel member 212 of the enclosure structure 21, the steel purlin 23 is supported by the support 26, and the support 26 is a triangular frame. The steel purlin 23 adopts double-spliced H-shaped steel, the end part of the steel purlin 23 abuts against the end part of the concrete purlin 22, the end part of the concrete purlin 22 is provided with a buried plate 221, and the end part of the steel purlin 23 abuts against the buried plate 221 and is fixedly connected with the buried plate 221.
As still another preferred embodiment of the present invention, as shown in fig. 3 and 4, the construction of the concrete purlin 22 further includes: providing a connecting hanging rib 25, and inserting a first end 251 of the connecting hanging rib 25 into the triaxial stirring pile 211 and fixedly connecting with the profile steel member 212; a second end 252 of the connecting hanger bar 25 opposite the first end 251 is anchored vertically within the concrete purlin 22, thereby transferring the vertical load of the concrete purlin 22 to the enclosure 21 via the connecting hanger bar 25. The vertical shape is a state disposed along the vertical direction F1. The connecting hanging bar 25 comprises an inclined section positioned in the middle and vertical sections positioned at two ends of the inclined section, the vertical section and part of the inclined section positioned at the first end 251 are inserted into the triaxial mixing pile 211, and the vertical section is fixedly connected with the steel member 212; the vertical and partially sloped sections at the second end 252 are inserted into the concrete purlin 22 with the vertical section of the second end 252 disposed vertically. The self weight of the concrete surrounding purlin 22 and the vertical load born by the concrete surrounding purlin 22 can be balanced through the connecting hanging ribs 25.
As a further preferred embodiment of the present invention, the force transfer member 25 is a horizontal oblique steel bar, and the horizontal oblique steel bar is disposed at the joint between the concrete enclosing purlin 22 and the enclosure structure 21, and the concrete enclosing purlin and the enclosure structure are tied by anchoring the horizontal oblique steel bar, so that on one hand, the horizontal oblique steel bar can improve the structural strength of the concrete enclosing purlin 22, and on the other hand, the horizontal oblique steel bar can transmit the axial force of the concrete enclosing purlin 22 to the enclosure structure, reduce the axial force on the concrete enclosing purlin 22, further reduce the axial pressure of the steel enclosing purlin, optimize the stress condition of the support structure, and ensure the stability and safety of the support structure.
The present invention has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the invention based on the above description. Accordingly, certain details of the illustrated embodiments are not to be taken as limiting the invention, which is defined by the appended claims.
Claims (4)
1. The construction method of the concrete-assembled type steel mixed enclosing purlin in the foundation pit supporting structure is characterized by comprising the following steps of:
constructing an enclosure structure around the set position of the foundation pit;
constructing a foundation pit; and
constructing a concrete enclosing purlin on the enclosing structure close to the inner side of the foundation pit;
when the concrete enclosing purlin is constructed, a force transmission component is arranged at the joint of the enclosing structure and the concrete enclosing purlin;
fixedly connecting a first end of the force transfer member with the enclosure;
anchoring a second end of the force transfer member opposite to the first end in the concrete purlin in a manner intersecting the axial force direction of the concrete purlin, thereby transmitting the axial force of the concrete purlin to the enclosure structure through the force transfer member;
the enclosure structure is a triaxial stirring pile, and a section steel member is inserted into the triaxial stirring pile;
fixedly connecting the first end of the force transfer member to the enclosure comprises:
inserting the first end of the force transfer component into the triaxial stirring pile and fixedly connecting the force transfer component with the profile steel piece;
the construction of the concrete surrounding purlin further comprises:
providing a connecting hanging rib, and inserting a first end of the connecting hanging rib into the triaxial stirring pile and fixedly connecting the connecting hanging rib with the profile steel piece;
anchoring a second end, opposite to the first end, of the connecting hanging bar in the concrete enclosing purlin in a vertical mode, and further transmitting the vertical load of the concrete enclosing purlin to the enclosing structure through the connecting hanging bar;
the force transfer component is a horizontal oblique reinforcing steel bar and is horizontally arranged.
2. The method of constructing a concrete-fabricated form steel hybrid purlin in a foundation pit support structure of claim 1, further comprising:
and erecting a steel enclosing purlin on the inner side of the enclosing structure, which is close to the foundation pit, and connecting the steel enclosing purlin with the corresponding concrete enclosing purlin in a butt joint manner.
3. The concrete-assembled steel mixed enclosing purlin in the foundation pit supporting structure is characterized in that a horizontally arranged force transmission component is arranged at the joint of the concrete enclosing purlin and the enclosing structure;
the first end of the force transfer component is fixedly connected with the enclosure structure;
a second end of the force transfer member opposite to the first end is anchored in the concrete purlin in a manner intersecting the axial force direction of the concrete purlin, and the axial force of the concrete purlin is transferred to the enclosure structure through the force transfer member;
the enclosure structure is a triaxial stirring pile, and a section steel member is inserted into the triaxial stirring pile;
the first end of the force transfer component is inserted into the triaxial mixing pile and fixedly connected with the profile steel piece;
the concrete enclosing structure is characterized by further comprising connecting hanging ribs which are arranged at the joint of the concrete enclosing purlin and the enclosing structure;
the first end of the connecting hanging bar is inserted into the triaxial stirring pile and fixedly connected with the profile steel piece;
a second end, opposite to the first end, of the connecting hanging bar is anchored in the concrete enclosing purlin in a vertical mode, and further vertical load of the concrete enclosing purlin is transmitted to the enclosing structure through the connecting hanging bar;
the force transfer component is a horizontal oblique reinforcing steel bar and is horizontally arranged.
4. The concrete-fabricated steel composite purlin of claim 3, further comprising a steel purlin supported on the enclosure adjacent to the interior of the foundation pit, said steel purlin being in butt-joint with a corresponding concrete purlin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710136885.1A CN107023019B (en) | 2017-03-09 | 2017-03-09 | Concrete-assembled steel mixed enclosing purlin in foundation pit supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710136885.1A CN107023019B (en) | 2017-03-09 | 2017-03-09 | Concrete-assembled steel mixed enclosing purlin in foundation pit supporting structure and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN107023019A CN107023019A (en) | 2017-08-08 |
| CN107023019B true CN107023019B (en) | 2023-11-21 |
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| CN201710136885.1A Active CN107023019B (en) | 2017-03-09 | 2017-03-09 | Concrete-assembled steel mixed enclosing purlin in foundation pit supporting structure and construction method thereof |
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| CN116163313B (en) * | 2022-11-23 | 2024-02-23 | 北方工业大学 | Connection structure of foundation pit section steel support and enclosure structure and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000303465A (en) * | 1999-04-19 | 2000-10-31 | Ohbayashi Corp | Method for retaining earth by low strength underground wall |
| KR20030010407A (en) * | 2001-07-27 | 2003-02-05 | 정란 | A fiber reinforced earth retaining wall, a constructing method thereof, and a composite underground wall structure using thereof |
| JP2003261949A (en) * | 2002-03-07 | 2003-09-19 | Shimizu Corp | Composite wall formed of earth retaining core and underground exterior wall and its construction method |
| CN102505696A (en) * | 2011-10-28 | 2012-06-20 | 上海建瓴工程咨询有限公司 | Support system of rear support removing type section steel-concrete double-enclosing-purlin foundation pit and construction method |
| CN105780782A (en) * | 2016-05-18 | 2016-07-20 | 中铁第四勘察设计院集团有限公司 | Oblique support and steel retaining purlin slip preventing device with piles constructed by SMW construction process |
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2017
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| JP2000303465A (en) * | 1999-04-19 | 2000-10-31 | Ohbayashi Corp | Method for retaining earth by low strength underground wall |
| KR20030010407A (en) * | 2001-07-27 | 2003-02-05 | 정란 | A fiber reinforced earth retaining wall, a constructing method thereof, and a composite underground wall structure using thereof |
| JP2003261949A (en) * | 2002-03-07 | 2003-09-19 | Shimizu Corp | Composite wall formed of earth retaining core and underground exterior wall and its construction method |
| CN102505696A (en) * | 2011-10-28 | 2012-06-20 | 上海建瓴工程咨询有限公司 | Support system of rear support removing type section steel-concrete double-enclosing-purlin foundation pit and construction method |
| CN105780782A (en) * | 2016-05-18 | 2016-07-20 | 中铁第四勘察设计院集团有限公司 | Oblique support and steel retaining purlin slip preventing device with piles constructed by SMW construction process |
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| CN107023019A (en) | 2017-08-08 |
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