CN115012423A - Waist beam pouring construction method for foundation pit support and waist beam structure - Google Patents
Waist beam pouring construction method for foundation pit support and waist beam structure Download PDFInfo
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- CN115012423A CN115012423A CN202210632559.0A CN202210632559A CN115012423A CN 115012423 A CN115012423 A CN 115012423A CN 202210632559 A CN202210632559 A CN 202210632559A CN 115012423 A CN115012423 A CN 115012423A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention belongs to the technical field of foundation pit supporting construction, and provides a waist beam pouring construction method and a waist beam structure of foundation pit supporting, wherein the construction method comprises the following steps: s1, moving the plurality of prefabricated tire membranes to a preset position, and fixing the plurality of prefabricated tire membranes; the prefabricated tire membrane is arranged in an L shape, an opening of the prefabricated tire membrane corresponds to the underground continuous wall, and a wale cast-in-place space is formed between the opening of the prefabricated tire membrane and the underground continuous wall; s2, mounting an inner support between two adjacent prefabricated formworks, wherein a cast-in-place node space is formed between the inner support and an underground continuous wall; and S3, carrying out cast-in-place construction on the waist rail cast-in-place space and the cast-in-place node space, thereby completing the waist rail cast construction of the foundation pit support. The construction method has the advantages of short construction period, simple field construction process and good bearing capacity, and is favorable for improving the field construction efficiency and quality of the foundation pit support.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting construction, and particularly relates to a waist beam pouring construction method and a waist beam structure for foundation pit supporting.
Background
At present, in domestic foundation pit projects with poor geological conditions or large excavation depths, such as subway station foundation pits, a retaining pile/underground continuous wall and a supporting type with an inner support are adopted, and the inner support and the retaining pile/underground continuous wall are connected through a waist rail. The commonly used wale comprises a profile steel wale (steel purlin) and a reinforced concrete wale; the steel waist beam is mainly made of double-spliced steel and is characterized by being repeatedly disassembled and assembled, but being small in rigidity, easy to deform and poor in bearing capacity, and is mostly matched with a steel support for use; the reinforced concrete waist beam is high in rigidity and bearing capacity, but a template needs to be arranged, so that the defects of long pouring time, slow strength forming and the like exist, and the foundation pit is easy to horizontally deform in the period.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the waist beam pouring construction method for the foundation pit support, which has the advantages of short construction period, simple field construction process and good bearing capacity and is beneficial to improving the field construction efficiency and quality of the foundation pit support.
Another object of the present invention is to provide a wale structure for supporting a foundation pit.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a pouring construction method for a waist beam of a foundation pit support comprises the following steps:
s1, moving the plurality of prefabricated tire membranes to preset positions and fixing the plurality of prefabricated tire membranes; the position to be poured of the prefabricated tire membrane corresponds to the underground continuous wall, and a waist beam cast-in-place space is formed between the position to be poured of the prefabricated tire membrane and the underground continuous wall;
s2, mounting an inner support between two adjacent prefabricated formworks, wherein a cast-in-place node space is formed between the inner support and an underground continuous wall;
s3, carrying out cast-in-place construction on the waist rail cast-in-place space and the cast-in-place node space, forming a cast-in-place waist rail in the waist rail cast-in-place space and the cast-in-place node space, and forming a waist rail structure of foundation pit support by the cast-in-place waist rail and the prefabricated formworks, thereby completing the waist rail casting construction of foundation pit support.
Preferably, the prefabricated tire membrane is arranged in an L shape, and an opening of the prefabricated tire membrane corresponds to the underground continuous wall.
Preferably, in step S1, the connection between the anchor bars in the wale and the steel bar connector on the underground continuous wall is completed, and then the prefabricated tire casing is moved to the predetermined position.
Preferably, a wale hoop is arranged in the prefabricated tire membrane, and the wale hoop is connected with the prefabricated tire membrane and extends to the opening.
Preferably, in step S1, after the fixing of the prefabricated tire casing is completed, a wale main rib is inserted into a wale stirrup on the wale of the tire casing, and the wale main rib is connected to the wale stirrup in a fitting manner.
Preferably, in step S2, an inner support is installed between the prefabricated tire membranes, and a support end of the inner support is disposed corresponding to an outer side of the prefabricated tire membrane.
A waist beam structure for supporting a foundation pit comprises a plurality of prefabricated tire membranes and a cast-in-place waist beam; the position to be poured of the prefabricated tire membrane is arranged corresponding to the underground continuous wall, and a wale cast-in-place space is formed between the position to be poured of the prefabricated tire membrane and the underground continuous wall; the cast-in-place wale is formed by casting a cast-in-place space of the wale.
Preferably, the prefabricated tire membrane is arranged in an L shape, and an opening of the prefabricated tire membrane corresponds to the underground continuous wall.
Preferably, a plurality of the prefabricated tire membranes are arranged separately, and an inner support is arranged between the plurality of the prefabricated tire membranes; a cast-in-place node space is formed between the inner support and the underground continuous wall; the cast-in-place wale is formed by casting a cast-in-place space and a cast-in-place node space to the wale.
Preferably, the support end of the inner support is arranged corresponding to the outer side of the prefabricated tire membrane on two sides.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the L-shaped prefabricated tire membrane as a template of the cast-in-place waist rail, and simultaneously, the prefabricated tire membrane is also used as a part of the stress structure of the formed waist rail, thereby forming the semi-prefabricated waist rail construction method. In the construction process, after the prefabricated tire membrane is transferred to a preset position, the cast-in-place construction can be carried out, the construction is rapid and efficient, the amount of cast-in-place concrete is reduced, the casting time is shortened, the construction process is simplified, effective support can be formed in time after the foundation pit is excavated, the deformation of the foundation pit is favorably controlled, the protection of surrounding buildings (structures) is enhanced, and the safety of the foundation pit is enhanced.
2. The prefabricated tire membrane is prefabricated in a factory, the construction quality and the size precision of the prefabricated tire membrane are greatly improved compared with those of on-site cast-in-place, and the appearance effect is good. In addition, in the construction process, the gap between the prefabricated tire membranes and the underground continuous wall and the distance between two adjacent prefabricated tire membranes can be flexibly adjusted so as to adapt to construction errors, and the applicability is good.
3. The prefabricated tire membrane can be applied to common cast-in-place underground structure foundation pits and assembly type underground structure foundation pits, and is wide in applicability. When the method is applied to the assembled underground structure foundation pit, the finally formed waist beam and the inner support can be used as permanent structures, dismounting is not needed, the working procedures are simplified, the working efficiency is improved, the manufacturing cost is saved, the assembly rate of the building is increased, and the method can be applied to large-scale batch production and large-scale popularization in factories.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic side sectional view of a wale structure of a foundation pit support at a prefabricated tire membrane according to the present invention.
Fig. 2 is a schematic side sectional view of a wale structure of a foundation pit support at an inner support according to the present invention.
Fig. 3 is a schematic view of a wale stirrup, a wale main reinforcement and a reinforcement connector in the underground continuous wall.
Fig. 4 is a schematic top view of a wale structure of a foundation pit support of the present invention.
Wherein:
1-prefabricated bed mould, 2-wale cast-in-place space, 3-internal support, 4-underground continuous wall, 5-wale stirrup, 6-wale main reinforcement, 7-wall internal anchor reinforcement, 8-steel bar connector, 9-wale internal anchor reinforcement and 10-cast-in-place node space.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
Referring to fig. 1 to 4, the embodiment discloses a casting construction method for a waist rail of a foundation pit support, which includes the following steps:
s1, when the underground continuous wall 4 is constructed, embedding an anchor bar 7 in the wall and a steel bar connector 8 in the underground continuous wall 4, wherein the anchor bar 7 in the embedded wall is connected with the steel bar connector 8, and the steel bar connector 8 is embedded in the underground continuous wall 4 and arranged close to the outside so as to expose the underground continuous wall after a protective layer is chiseled at the later stage; meanwhile, after the construction of the underground continuous wall 4 is completed, the protective layer of the underground continuous wall 4 is chiseled off, and the reinforcing steel bar connector 8 is exposed.
And connecting the anchor bars 9 in the wale with the steel bar connector 8.
Moving a plurality of prefabricated tire membranes 1 to a preset position, and fixing the plurality of prefabricated tire membranes 1 by using a wood strip.
In the embodiment, the prefabricated tire membrane 1 is arranged in an L shape, an opening of the prefabricated tire membrane 1 corresponds to the underground continuous wall 4, and a waist rail cast-in-place space 2 is formed between the opening of the prefabricated tire membrane 1 and the underground continuous wall 4; a waist rail stirrup 5 is additionally arranged in the prefabricated tire membrane 1, and the waist rail stirrup 5 is connected with the prefabricated tire membrane 1 and extends to an opening; in addition, when the prefabricated tire membrane 1 is moved, the wale stirrup 5 on the prefabricated tire membrane 1 and the wale inner anchor bar 9 are staggered and do not interfere with each other.
And S2, longitudinally inserting a wale main reinforcement 6 into the wale stirrup 5 on the membrane wale, and fixedly binding the wale main reinforcement with the wale stirrup 5 in a matching manner.
An inner support 3 is arranged between two adjacent prefabricated formworks 1, the inner support 3 and the prefabricated formworks 1 on two sides are mutually spliced, and a cast-in-place node space 10 is formed between the inner support 3 and an underground continuous wall 4.
The wale stirrup 5 on the prefabricated tire membranes 1 in the embodiment extends out of two ends of the prefabricated tire membranes 1, so that after the plurality of prefabricated tire membranes 1 are fixed, the cast-in-place node space 10 between every two adjacent prefabricated tire membranes 1 also has a steel bar structure, and the reliability of the wale after being formed is improved.
S3, carrying out cast-in-place construction on the waist rail cast-in-place space 2 and the cast-in-place node space 10, forming a cast-in-place waist rail in the waist rail cast-in-place space 2 and the cast-in-place node space 10, and forming a waist rail structure of the foundation pit support by the cast-in-place waist rail and the prefabricated formworks 1, thereby completing the waist rail casting construction of the foundation pit support.
In this embodiment, when the inner support 3 is installed between a plurality of the pre-form membranes 1, the support end of the inner support 3 is arranged corresponding to the outer side of the pre-form membrane 1, as shown in fig. 4. The inner support 3 in this embodiment may be a common concrete support beam, a steel reinforced concrete support beam, a precast concrete support beam, or the like, and the support end of the inner support 3 leaves a swing rib and extends into the cast-in-place node space 10, so that a fixed support node is formed in the cast-in-place node space 10 after casting, the connection stability between the waist beam structure and the inner support 3 is higher, and the protection of the foundation pit is further improved.
Specifically, the precast tire mold in this embodiment is an L-shaped precast concrete tire mold. Taking a standard underground two-layer subway station foundation pit as an example, the length of the prefabricated tire membrane 1 is matched with the distance between the inner supports 3, the height and the width of the prefabricated tire membrane 1 can be determined according to actual needs, and in addition, the wall thickness of the prefabricated tire membrane 1 is about 0.1-0.2 m. Therefore, the prefabricated tire membrane 1 of the embodiment has the advantages of light weight, convenience in lifting, strong bearing capacity of the common concrete waist beam and high construction speed of the steel waist beam. Preferably, a gap is reserved between the prefabricated tire membrane 1 and the underground continuous wall 4, wherein the distance can be adjusted according to the actual construction error of the underground continuous wall 4, and a gap of about 0.1m is reserved generally.
The wale stirrups 5 in the wale structure finally formed in the embodiment are all prefabricated and processed along with the prefabricated tire membrane 1, and a part of wale main reinforcements 6 are simultaneously contained in the prefabricated tire membrane 1 so as to improve the strength of the prefabricated tire membrane 1; meanwhile, the distance between the wale stirrups 5 needs to be kept uniform. Thus, the prefabricated tire membrane 1 of the embodiment is a part of a waist rail structure and is also used as a pouring template of a cast-in-place waist rail part, and has sufficient strength and reliability, convenient use and novel design; when this scheme is applied to assembled underground structure, the waist rail structure can also be as the structure floor with interior support 3, need not to demolish in the stage of building back, has saved the time limit for a project, has avoided the waste, accords with the requirement of developing the assembled building energetically at present. Further, after the prefabricated tire membrane 1 is translated to a preset position during construction, the waist rail stirrups 5 are also installed in place, and only the remaining waist rail main reinforcements 6 need to be inserted, so that the arrangement of the reinforcement structure of the waist rail structure is completed, the on-site reinforcement binding time is reduced by about 70%, and the on-site construction efficiency is obviously improved.
The traditional foundation pit concrete waist rail needs a large number of templates, and has long construction period and poor working efficiency. In the cast-in-place construction process in step S3 of this embodiment, for the cast-in-place construction of the wale cast-in-place space 2, a small number of wood formers may be used, the soil formers may be directly used in the gaps between the prefabricated tire casings 1 and the underground continuous walls 4, and a wood formwork may be additionally disposed in the cast-in-place node space 10. Like this, can save 90% waist rail template when site operation, have green energy-concerving and environment-protective advantage, it is long when effectively reducing construction cost and construction process and construction.
Referring to fig. 1 to 4, the embodiment further discloses a waist rail structure for supporting a foundation pit, which includes a plurality of prefabricated formworks 1 and a cast-in-place waist rail; the prefabricated tire membrane 1 is arranged in an L shape, an opening of the prefabricated tire membrane 1 is arranged corresponding to the underground continuous wall 4, and a waist rail cast-in-place space 2 is formed between the opening of the prefabricated tire membrane 1 and the underground continuous wall 4; the cast-in-place wale is formed by casting the cast-in-place space 2 of the wale. The plurality of prefabricated tire membranes 1 are arranged separately, and inner supports 3 are arranged among the plurality of prefabricated tire membranes 1; a cast-in-place node space 10 is formed between the inner support 3 and the underground continuous wall 4; the cast-in-place wale is formed by casting the cast-in-place space 2 and the cast-in-place node space 10 on the wale. The supporting end of the inner support 3 is arranged corresponding to the outer sides of the prefabricated tire membranes 1 on two sides.
In this embodiment, the precast tire membrane 1 is provided with a wale stirrup 5. The wale stirrup 5 is prefabricated and processed together with the prefabricated tire membrane 1, and in addition, partial main reinforcements of a wale structure are also arranged on the prefabricated tire membrane 1.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. The casting construction method for the waist beam of the foundation pit support is characterized by comprising the following steps of:
s1, moving the plurality of prefabricated tire membranes to preset positions and fixing the plurality of prefabricated tire membranes; the position to be poured of the prefabricated tire membrane corresponds to the underground continuous wall, and a waist beam cast-in-place space is formed between the position to be poured of the prefabricated tire membrane and the underground continuous wall;
s2, mounting an inner support between two adjacent prefabricated formworks, wherein a cast-in-place node space is formed between the inner support and an underground continuous wall;
s3, carrying out cast-in-place construction on the waist rail cast-in-place space and the cast-in-place node space, forming a cast-in-place waist rail in the waist rail cast-in-place space and the cast-in-place node space, and forming a waist rail structure of foundation pit support by the cast-in-place waist rail and the prefabricated formworks, thereby completing the waist rail casting construction of foundation pit support.
2. The wale pouring construction method for the foundation pit support according to claim 1, wherein the prefabricated tire membrane is arranged in an L shape, and an opening of the prefabricated tire membrane corresponds to the underground continuous wall.
3. The wale casting construction method for foundation pit support according to claim 2, wherein in the step S1, the connection between the anchor bars in the wale and the reinforcing bar connectors on the underground continuous wall is completed, and then the prefabricated tire membranes are moved to the predetermined position.
4. The wale pouring construction method for foundation pit support according to claim 1, wherein a wale hoop is arranged in the prefabricated tire film, and the wale hoop is connected with the prefabricated tire film and extends to the opening.
5. The wale casting construction method for foundation pit support according to claim 4, wherein in the step S1, after the prefabricated tire membrane is fixed, a wale main reinforcement is inserted into a wale stirrup on the wale of the tire membrane and is connected with the wale stirrup in a matching manner.
6. The wale casting method for an excavation supporting according to claim 1, wherein in the step S2, an inner support is installed between the prefabricated formworks, and a support end of the inner support is disposed corresponding to an outer side of the prefabricated formworks.
7. A wale structure of a foundation pit support used in the wale casting construction method of a foundation pit support according to any one of claims 1 to 6, comprising a plurality of prefabricated formworks and a cast-in-place wale; the position to be poured of the prefabricated tire membrane is arranged corresponding to the underground continuous wall, and a wale cast-in-place space is formed between the position to be poured of the prefabricated tire membrane and the underground continuous wall; the cast-in-place wale is formed by casting a cast-in-place space of the wale.
8. The wale structure for foundation pit support according to claim 7, wherein the prefabricated tire film is provided in an L shape, and an opening of the prefabricated tire film corresponds to an underground continuous wall.
9. The wale structure for foundation pit support according to claim 7 or 8, wherein a plurality of the prefabricated formworks are separately provided, and an inner support is provided between the plurality of the prefabricated formworks; a cast-in-place node space is formed between the inner support and the underground continuous wall; the cast-in-place wale is formed by casting a cast-in-place space and a cast-in-place node space to the wale.
10. The wale structure for foundation pit support according to claim 8, wherein a support end of the inner support is provided to correspond to an outer side of the pre-mold on both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210632559.0A CN115012423B (en) | 2022-06-07 | 2022-06-07 | Waist beam pouring construction method and waist beam structure for foundation pit support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210632559.0A CN115012423B (en) | 2022-06-07 | 2022-06-07 | Waist beam pouring construction method and waist beam structure for foundation pit support |
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| CN115012423A true CN115012423A (en) | 2022-09-06 |
| CN115012423B CN115012423B (en) | 2023-10-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011009219A1 (en) * | 2009-07-24 | 2011-01-27 | Sfs Structures Ltd. | Shoring free excavation and basement construction apparatus and method |
| CN103122672A (en) * | 2013-01-10 | 2013-05-29 | 梁振东 | Ring beam brick |
| CN103334439A (en) * | 2013-06-06 | 2013-10-02 | 广西建工集团第五建筑工程有限责任公司 | Long-span reinforced concrete inner support structure of rectangular deep foundation pit and construction method of structure |
| CN209568450U (en) * | 2019-02-01 | 2019-11-01 | 广州建筑产业研究院有限公司 | A kind of connection structure for foundation pit assembled inner bracing member and crown beam |
| CN113882390A (en) * | 2021-09-15 | 2022-01-04 | 深圳市综合交通设计研究院有限公司 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
-
2022
- 2022-06-07 CN CN202210632559.0A patent/CN115012423B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011009219A1 (en) * | 2009-07-24 | 2011-01-27 | Sfs Structures Ltd. | Shoring free excavation and basement construction apparatus and method |
| CN103122672A (en) * | 2013-01-10 | 2013-05-29 | 梁振东 | Ring beam brick |
| CN103334439A (en) * | 2013-06-06 | 2013-10-02 | 广西建工集团第五建筑工程有限责任公司 | Long-span reinforced concrete inner support structure of rectangular deep foundation pit and construction method of structure |
| CN209568450U (en) * | 2019-02-01 | 2019-11-01 | 广州建筑产业研究院有限公司 | A kind of connection structure for foundation pit assembled inner bracing member and crown beam |
| CN113882390A (en) * | 2021-09-15 | 2022-01-04 | 深圳市综合交通设计研究院有限公司 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
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| CN115012423B (en) | 2023-10-10 |
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