CN112431208A - Construction method for deep foundation pit supporting by adopting component type force transmission belt - Google Patents
Construction method for deep foundation pit supporting by adopting component type force transmission belt Download PDFInfo
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- CN112431208A CN112431208A CN202011297717.9A CN202011297717A CN112431208A CN 112431208 A CN112431208 A CN 112431208A CN 202011297717 A CN202011297717 A CN 202011297717A CN 112431208 A CN112431208 A CN 112431208A
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- transmission belt
- force transmission
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- 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
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- 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
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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a construction method of a component type force transmission belt for deep foundation pit supporting, which comprises the steps of firstly determining a hanging rib connecting part on a supporting pile, chiseling concrete at the part to expose a longitudinal main rib of the supporting pile, and welding the top end of the hanging rib to the longitudinal main rib; arranging a first bracket at the lower part of the support pile through an expansion bolt; the steel purlin is placed on the first bracket, and the hanging ribs are connected with the steel purlin to stably hang the steel purlin; an embedded part is reserved at the joint of the structural shear wall and the beam, and a second bracket support is welded on the embedded part; and a steel pipe is arranged between the steel purlin and the second bracket to form a component force transmission belt. The method overcomes the defects of the traditional cast-in-place concrete force transmission belt construction, effectively reduces the construction period of the force transmission belt, improves the construction efficiency, can recycle and reuse components without burying soil, does not cause pollution to the environment, and saves the construction cost.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a component type force transmission belt for deep foundation pit supporting.
Background
In deep foundation pit engineering with basements, support design is generally carried out by arranging supports according to the number of the basement layers (single-layer or multi-layer basements), and the number of the support layers is consistent with the number of the basement layers. In the construction process, when each layer of support is dismantled from bottom to top, the support is replaced to ensure the stability and safety of the deep foundation pit. The traditional support replacement adopts a cast-in-place concrete force transmission belt for construction, and the process flow is as follows:
after the construction of the basic raft is finished, a cast-in-place concrete force transmission belt is arranged between the raft foundation and the support piles for replacing the support, the upper support can be detached after the concrete of the force transmission belt reaches the design strength, and then the construction of the upper structure is carried out. In the upper basement structure, once one floor is constructed, the supports must be replaced and then removed, and finally the structure is constructed. When the support is replaced, the construction must be carried out according to the following procedures:
1. after the basement concrete shear wall reaches a certain strength, removing the template, clearing and processing the split bolts;
2. waterproof construction is carried out on the basement shear wall, and the waterproof layer is well protected;
3. performing backfill construction on the position between the shear wall and the supporting pile;
4. pouring concrete on the backfill soil to ensure that the concrete is tightly connected with the shear wall and the support pile to form a cast-in-place concrete force transmission belt;
5. after the on-site concrete force transmission belt reaches the design strength, the support replacement is completed;
6. and (5) dismantling the upper supporting structure and carrying out upper structure construction.
The defects of the traditional on-site concrete force transmission belt construction are as follows: before the shear wall template is dismantled, the concrete strength can be met only when the concrete strength meets the design requirement, and the concrete strength usually needs 7 days; 5 days are needed for waterproof construction and waterproof layer protection construction of the shear wall; the backfill construction needs 5 days; the construction and the strength of the cast-in-place concrete force transmission belt meet the design requirements and need 10 days; after the concrete is poured on site, the concrete is buried in soil, so that the environment is polluted, and the cost loss is large. According to the defects, the traditional cast-in-place concrete force transmission belt is long in construction time consumption, high in cost, not environment-friendly, inconvenient in cast-in-place concrete construction and high in labor intensity, and is particularly not beneficial to winter construction.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for supporting a deep foundation pit by using a component type force transmission belt, which overcomes the defects of the construction of the traditional cast-in-place concrete force transmission belt, effectively reduces the construction period of the force transmission belt, improves the construction efficiency, can recycle components, is not required to be buried in soil, does not pollute the environment and saves the construction cost.
In order to solve the technical problem, the construction method of the deep foundation pit support by adopting the component type force transmission belt comprises the following steps:
firstly, determining a hanging bar connecting part at the upper part of a support pile, and marking the part;
chiseling supporting pile concrete at the mark position of the supporting pile to expose the longitudinal main rib of the supporting pile, and welding the top end of the hanging rib to the longitudinal main rib by adopting double-sided lap joint;
step three, installing an expansion bolt at the lower part of the support pile, and arranging a first bracket support through the expansion bolt;
manufacturing a steel enclosing purlin, placing the bottom surface of the steel enclosing purlin on the first bracket, welding the bottom end of the hanging rib to the top surface of the steel enclosing purlin, and stably hanging the steel enclosing purlin;
step five, during construction of the basement structure, reserving an embedded part at the joint of the structural shear wall and the beam, and welding a second bracket support on the embedded part;
and step six, arranging a steel pipe between the steel enclosing purlin and the second bracket, fixing one end of the steel pipe on the steel enclosing purlin, welding the other end of the steel pipe on the second bracket, and forming a component force transmission belt through the steel enclosing purlin, the steel pipe and the second bracket.
Furthermore, the specification of the hanging steel bar is HRB400-25 steel bars.
Further, the diameter of the steel pipe is 600 mm.
The construction method of the invention adopts the technical scheme that the construction method of the component type force transmission belt for supporting the deep foundation pit adopts the technical scheme that firstly, the method determines the connection part of the hanging rib on the supporting pile, chisels off the concrete at the part to expose the longitudinal main rib of the supporting pile, and welds the top end of the hanging rib on the longitudinal main rib; arranging a first bracket at the lower part of the support pile through an expansion bolt; the steel purlin is placed on the first bracket, and the hanging ribs are connected with the steel purlin to stably hang the steel purlin; an embedded part is reserved at the joint of the structural shear wall and the beam, and a second bracket support is welded on the embedded part; and a steel pipe is arranged between the steel purlin and the second bracket to form a component force transmission belt. The method overcomes the defects of the traditional cast-in-place concrete force transmission belt construction, effectively reduces the construction period of the force transmission belt, improves the construction efficiency, can recycle and reuse components without burying soil, does not cause pollution to the environment, and saves the construction cost.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of a construction method of a component type force transmission belt for deep foundation pit support of the invention.
Detailed Description
The embodiment is shown in figure 1, and the construction method of the deep foundation pit support adopting the component type force transmission belt comprises the following steps:
firstly, determining a connection part of a lifting rib 2 at the upper part of a support pile 1, and marking the connection part;
chiseling concrete of the support pile 1 at the marked position of the support pile 1 to expose the longitudinal main rib 11 of the support pile, and welding the top end of the hanging rib 2 to the longitudinal main rib 11 by adopting double-sided lap joint;
step three, installing an expansion bolt at the lower part of the support pile 1, and arranging a first bracket support 3 through the expansion bolt;
fourthly, manufacturing a steel surrounding purlin 4, placing the bottom surface of the steel surrounding purlin 4 on the first bracket support 3, welding the bottom end of the hanging rib 2 to the top surface of the steel surrounding purlin 4, and stably hanging the steel surrounding purlin 4;
step five, during the construction of the basement structure, reserving an embedded part 5 at the joint of the structural shear wall and the beam, and welding a second bracket support 6 on the embedded part 5;
and step six, arranging a steel pipe 7 between the steel enclosing purlin 4 and the second bracket 6, fixing one end of the steel pipe 7 on the steel enclosing purlin 4, welding the other end of the steel pipe 7 with the second bracket 6, and forming a component force transmission belt through the steel enclosing purlin 4, the steel pipe 7 and the second bracket 6.
Preferably, the hanging bar 2 is HRB400-25 steel bar.
Preferably, the diameter of the steel pipe 7 is 600 mm.
According to the method, in the construction of the basement of the deep foundation pit, the shear wall template does not need to be removed in advance and the outer wall does not need to be waterproof in advance before the upper support is removed, earthwork backfilling does not need to be carried out in advance, the concrete curing time of the traditional cast-in-place concrete force transmission belt is also not needed, and the construction period can be about 30 days in advance. For the construction of the deep foundation pit, the shorter the construction period is, the smaller the support risk is, and the construction period is advanced by 30 days, so that the construction risk of the deep foundation pit is greatly reduced. Meanwhile, the traditional cast-in-place concrete force transmission belt can only be buried in a soil body and cannot be recycled; the component type force transmission belt in the method can be disassembled and recycled after the construction of the basement structure is finished, so that the construction cost is greatly saved. In the concrete construction process, because the basement is under construction, strong noise is caused by vibration during the construction of the traditional cast-in-place concrete force transmission belt, the traditional cast-in-place concrete force transmission belt has serious noise and dirty beams, and the component type force transmission belt does not pollute the environment, does not have strong noise during the construction process, and meets the requirement of green construction. The cast-in-place concrete force transmission belt for basement construction has high construction labor intensity and inconvenient construction operation; the component type force transmission belt is adopted to replace the traditional concrete force transmission belt, the construction process is simple, the operation is convenient, and manpower and material resources are saved.
Claims (3)
1. A construction method for supporting a deep foundation pit by adopting a component type force transmission belt is characterized by comprising the following steps:
firstly, determining a hanging bar connecting part at the upper part of a support pile, and marking the part;
chiseling supporting pile concrete at the mark position of the supporting pile to expose the longitudinal main rib of the supporting pile, and welding the top end of the hanging rib to the longitudinal main rib by adopting double-sided lap joint;
step three, installing an expansion bolt at the lower part of the support pile, and arranging a first bracket support through the expansion bolt;
manufacturing a steel enclosing purlin, placing the bottom surface of the steel enclosing purlin on the first bracket, welding the bottom end of the hanging rib to the top surface of the steel enclosing purlin, and stably hanging the steel enclosing purlin;
step five, during construction of the basement structure, reserving an embedded part at the joint of the structural shear wall and the beam, and welding a second bracket support on the embedded part;
and step six, arranging a steel pipe between the steel enclosing purlin and the second bracket, fixing one end of the steel pipe on the steel enclosing purlin, welding the other end of the steel pipe on the second bracket, and forming a component force transmission belt through the steel enclosing purlin, the steel pipe and the second bracket.
2. The construction method of the component type force transmission belt for the deep foundation pit support according to claim 1, characterized in that: the specification of the hanging bar is HRB400-25 steel bars.
3. The construction method of the component type force transmission belt for the deep foundation pit support according to claim 1 or 2, characterized in that: the diameter of the steel pipe is 600 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011297717.9A CN112431208A (en) | 2020-11-18 | 2020-11-18 | Construction method for deep foundation pit supporting by adopting component type force transmission belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011297717.9A CN112431208A (en) | 2020-11-18 | 2020-11-18 | Construction method for deep foundation pit supporting by adopting component type force transmission belt |
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| CN112431208A true CN112431208A (en) | 2021-03-02 |
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| CN202011297717.9A Pending CN112431208A (en) | 2020-11-18 | 2020-11-18 | Construction method for deep foundation pit supporting by adopting component type force transmission belt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032965A (en) * | 2021-11-25 | 2022-02-11 | 中国建筑第八工程局有限公司 | Force transmission belt structure of blocking wall of subway station and construction method thereof |
| CN114704309A (en) * | 2022-03-07 | 2022-07-05 | 中铁第一勘察设计院集团有限公司 | Temporary supporting structure for solving conflict between medium plate shield hole boundary beam and shield in subway station |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208201880U (en) * | 2018-01-12 | 2018-12-07 | 浙江中成建工集团有限公司 | A kind of interior steel pipe underpinning device for replacing traditional support replacement mode of deep basal pit |
-
2020
- 2020-11-18 CN CN202011297717.9A patent/CN112431208A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208201880U (en) * | 2018-01-12 | 2018-12-07 | 浙江中成建工集团有限公司 | A kind of interior steel pipe underpinning device for replacing traditional support replacement mode of deep basal pit |
Non-Patent Citations (1)
| Title |
|---|
| 刘飞: ""浅析船坞坞口深基坑开挖中支护体系的应用"", 《江西建材》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032965A (en) * | 2021-11-25 | 2022-02-11 | 中国建筑第八工程局有限公司 | Force transmission belt structure of blocking wall of subway station and construction method thereof |
| CN114704309A (en) * | 2022-03-07 | 2022-07-05 | 中铁第一勘察设计院集团有限公司 | Temporary supporting structure for solving conflict between medium plate shield hole boundary beam and shield in subway station |
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Application publication date: 20210302 |