CN112095628A - Structure for controlling foundation pit deformation and construction method - Google Patents
Structure for controlling foundation pit deformation and construction method Download PDFInfo
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- CN112095628A CN112095628A CN202011085163.6A CN202011085163A CN112095628A CN 112095628 A CN112095628 A CN 112095628A CN 202011085163 A CN202011085163 A CN 202011085163A CN 112095628 A CN112095628 A CN 112095628A
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- foundation pit
- underground
- wall
- deformation
- continuous wall
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 239000002689 soil Substances 0.000 claims description 5
- 238000009432 framing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000003337 fertilizer Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 description 1
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a structure for controlling foundation pit deformation and a construction method, wherein the structure comprises a surrounding body arranged along the periphery of a foundation pit, an inner support is arranged on the inner side of the surrounding body, a continuous underground wall is arranged in the foundation pit and is vertical to the long side direction of the foundation pit, and the underground wall is composed of a reinforced underground continuous wall at the lower part and a plain concrete underground continuous wall at the upper part. The invention utilizes the underground wall to control the deformation of the foundation pit, solves the problem of the damage of the deformation of the deep foundation pit to the surrounding environment, meets the safety requirement of the foundation pit construction, avoids the influence of the larger deformation of the foundation pit to the surrounding environment, and is beneficial to reducing the construction cost.
Description
Technical Field
The invention relates to a structure for controlling foundation pit deformation and a construction method, belonging to the technical field of industrial and civil building engineering.
Background
Along with the development of economy, in the construction of large and medium-sized cities, the construction land is more and more tense, the land cost is more and more high, and the development of high-rise and super high-rise buildings is brought, so that the utilization and the development of underground space are followed, and the characteristic that the foundation pit engineering is deep and large is also highlighted. In order to control the influence of the deformation of the foundation pit on underground and overground construction, the deformation resistance of the foundation pit enclosure system needs to be improved, which undoubtedly increases the construction cost.
Disclosure of Invention
The invention aims to provide a structure and a construction method for controlling the deformation of a foundation pit, which not only meet the requirement of safe deformation control in foundation pit construction, avoid the influence of larger deformation of the foundation pit on the surrounding environment, but also are beneficial to reducing the construction cost.
In order to achieve the purpose, the invention adopts the following technical scheme: the structure for controlling the deformation of the foundation pit comprises a surrounding body arranged along the periphery of the foundation pit, an inner support is arranged on the inner side of the surrounding body, a continuous underground wall is arranged in the foundation pit and perpendicular to the long side direction of the foundation pit, and the underground wall is composed of a reinforced underground continuous wall at the lower part and a plain concrete underground continuous wall at the upper part.
Furthermore, the enclosure body is an underground continuous wall arranged 1-1.5 m away from the outer side line of the underground structure.
Further, the inner support is a diagonal support or an inclined support arranged on the inner side of the enclosure body.
Meanwhile, the invention also provides a construction method for controlling the deformation of the foundation pit, which comprises the following steps:
firstly, constructing a ground middle wall along an enclosure body arranged on the periphery of a foundation pit according to a design drawing, wherein the ground middle wall is composed of a reinforced underground continuous wall at the lower part and a plain concrete underground continuous wall at the upper part, the ground middle wall is subjected to framing grooving by adopting a grooving machine, H-shaped steel is arranged on two sides of a first opening frame in the groove, transverse reinforcing steel bars of the ground connecting wall are welded between the H-shaped steel on two sides, and the height of the top of the H-shaped steel is consistent with that of the top of the plain concrete underground continuous wall;
hoisting a reinforcement cage, pouring concrete, and gradually finishing the construction of the reinforced underground continuous wall and the plain concrete underground continuous wall so that the underground wall formed by the reinforced underground continuous wall and the plain concrete underground continuous wall is intersected with the long edges at the two sides of the enclosure body;
step three, after the enclosure body and the underground wall reach the design strength, excavating earthwork in the foundation pit in a layered mode, and arranging an inner support on the inner side of the enclosure body; in the process of earthwork layered excavation, the earthwork is excavated while the plain concrete underground continuous wall is broken, the deformation of a deep soil body is controlled through the reinforced underground continuous wall, the inner support is removed after the construction of the underground structure is finished, and a foundation pit fertilizer groove is backfilled until the deformation of the foundation pit is controlled.
In the method, in order to ensure that the plain concrete is widened and the H-shaped steel does not deform, channel steel supports are welded between the H-shaped steel on two sides, and the two sides of the H-shaped steel are provided with the streaming sheets.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention utilizes the underground wall to control the deformation of the foundation pit, solves the problem of the damage of the deformation of the deep foundation pit to the surrounding environment, meets the safety requirement of the foundation pit construction, avoids the influence of the larger deformation of the foundation pit to the surrounding environment, and is beneficial to reducing the construction cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the underground wall;
FIG. 3 is a schematic view of the connection structure of the transverse reinforcement of the diaphragm wall, the H-shaped steel and the channel steel support;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
fig. 5 is a B-B sectional view of fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention comprises the following steps: referring to fig. 1, a structure for controlling deformation of a foundation pit and a construction method thereof include a surrounding body 1 disposed along a periphery of the foundation pit, an inner support 2 disposed inside the surrounding body 1, and a continuous underground wall 3 disposed in the foundation pit and perpendicular to a long side direction of the foundation pit, wherein the underground wall 3 is composed of a reinforced underground continuous wall 4 at a lower portion and a plain concrete underground continuous wall 5 at an upper portion. The inner support 2 and the enclosure body 1 are adopted to resist the lateral pressure of the soil body together, and the deformation of the long edge of the foundation pit is controlled through the underground wall 3, so that the displacement of the soil body in the deep layer of the foundation pit is reduced. The enclosure body 1 is an underground continuous wall arranged at a position 1-1.5 m away from the outer side line of the underground structure. The inner support 2 is a diagonal support or an inclined support arranged on the inner side of the enclosure body 1.
Referring to fig. 2 to 5, when the deformation construction of the foundation pit is controlled, the following steps can be adopted:
firstly, constructing a ground middle wall 3 along an enclosure body 1 arranged on the periphery of a foundation pit according to a design drawing, wherein the ground middle wall 3 consists of a reinforced underground continuous wall 4 at the lower part and a plain concrete underground continuous wall 5 at the upper part, the ground middle wall 3 is subjected to framing and grooving by adopting a grooving machine, H-shaped steels 7 are arranged at two sides of a first framing width in the groove, transverse reinforcing steel bars 6 of the ground connecting wall are welded between the H-shaped steels 7 at two sides, and the top elevation of the H-shaped steel 7 is consistent with the top elevation of the plain concrete underground continuous wall 5;
hoisting a reinforcement cage, pouring concrete, and gradually completing the construction of the reinforced underground continuous wall 4 and the plain concrete underground continuous wall 5, so that the underground wall 3 consisting of the reinforced underground continuous wall 4 and the plain concrete underground continuous wall 5 is intersected with the long edges at two sides of the enclosure 1;
step three, after the enclosure body 1 and the underground wall 3 reach the design strength, excavating earthwork in the foundation pit in a layered mode, and arranging an inner support 2 on the inner side of the enclosure body 1; in the process of earthwork layered excavation, the earthwork is excavated while the plain concrete underground continuous wall 5 is broken, the deformation of a deep soil body is controlled through the reinforced underground continuous wall 4, the inner support 2 is removed after the construction of an underground structure is finished, and a foundation pit fertilizer groove is backfilled until the deformation of the foundation pit is controlled.
In order to ensure that plain concrete becomes wide and the H-shaped steel 7 does not deform, a channel steel support 8 is welded between the H-shaped steel 7 on two sides, and meanwhile, the two sides of the H-shaped steel 7 are provided with the streaming sheets 9.
In conclusion, the invention utilizes the underground wall 3 to control the deformation of the foundation pit, solves the problem that the deformation of the deep foundation pit damages the surrounding environment, meets the safety requirement of the foundation pit construction, avoids the influence of the larger deformation of the foundation pit on the surrounding environment, and is beneficial to reducing the construction cost.
Claims (5)
1. A structure for controlling the deformation of a foundation pit, comprising a containment body (1) arranged along the perimeter of the foundation pit, characterized in that: an inner support (2) is arranged on the inner side of the enclosure body (1), a continuous underground wall (3) is arranged in the foundation pit and perpendicular to the long side direction of the foundation pit, and the underground wall (3) is composed of a reinforced underground continuous wall (4) at the lower part and a plain concrete underground continuous wall (5) at the upper part.
2. The structure for controlling deformation of a foundation pit according to claim 1, wherein: the enclosure body (1) is an underground continuous wall arranged at a position 1-1.5 m away from the outer side line of the underground structure.
3. The structure for controlling deformation of a foundation pit according to claim 1, wherein: the inner support (2) is a diagonal support or an inclined support arranged on the inner side of the enclosure body (1).
4. A construction method for controlling foundation pit deformation is characterized by comprising the following steps:
firstly, constructing an underground wall (3) along an enclosure body (1) arranged at the periphery of a foundation pit according to a design drawing, wherein the underground wall (3) consists of a reinforced underground continuous wall (4) at the lower part and a plain concrete underground continuous wall (5) at the upper part, the underground wall (3) is subjected to framing grooving by adopting a grooving machine, H-shaped steels (7) are arranged at two sides of a first-opened frame in the groove, transverse wall reinforcing steel bars (6) are welded between the H-shaped steels (7) at two sides, and the top elevation of the H-shaped steel (7) is consistent with the top elevation of the plain concrete underground continuous wall (5);
hoisting a reinforcement cage, pouring concrete, and gradually completing construction of the reinforced underground continuous wall (4) and the plain concrete underground continuous wall (5) so that a middle underground wall (3) formed by the reinforced underground continuous wall (4) and the plain concrete underground continuous wall (5) is intersected with the long edges at two sides of the enclosure body (1);
thirdly, after the enclosure body (1) and the underground wall (3) reach the design strength, excavating earthwork in the foundation pit in a layered mode, and arranging an inner support (2) on the inner side of the enclosure body (1); in the process of earthwork layered excavation, the earthwork is excavated while the plain concrete underground continuous wall (5) is broken, the deformation of a deep soil body is controlled through the reinforced underground continuous wall (4), the inner support (2) is removed after the construction of an underground structure is finished, and a foundation pit fertilizer groove is backfilled until the foundation pit deformation is controlled.
5. The construction method for controlling deformation of a foundation pit according to claim 4, wherein: in order to ensure that plain concrete is formed into a large width and the H-shaped steel (7) does not deform, channel steel supports (8) are welded between the H-shaped steel (7) on two sides, and meanwhile, flow sheets (9) are arranged on two sides of the H-shaped steel (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011085163.6A CN112095628A (en) | 2020-10-12 | 2020-10-12 | Structure for controlling foundation pit deformation and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011085163.6A CN112095628A (en) | 2020-10-12 | 2020-10-12 | Structure for controlling foundation pit deformation and construction method |
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| Publication Number | Publication Date |
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| CN112095628A true CN112095628A (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011085163.6A Pending CN112095628A (en) | 2020-10-12 | 2020-10-12 | Structure for controlling foundation pit deformation and construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108702A (en) * | 2009-12-25 | 2011-06-29 | 上海市基础工程有限公司 | Lowered underground continuous wall construction process |
| CN102505699A (en) * | 2011-10-12 | 2012-06-20 | 同济大学建筑设计研究院(集团)有限公司 | Advanced plain concrete wall system for controlling deformation of deep foundation pit, and design method thereof |
| CN105568958A (en) * | 2015-12-22 | 2016-05-11 | 上海市基础工程集团有限公司 | Variable cross-section underground diaphragm wall and construction method |
| CN105970916A (en) * | 2016-06-30 | 2016-09-28 | 中铁十八局集团第五工程有限公司 | Construction method for plain concrete underground diaphragm wall of deep foundation pit |
| CN212896389U (en) * | 2020-10-12 | 2021-04-06 | 中国建筑第四工程局有限公司 | Structure for controlling deformation of foundation pit |
-
2020
- 2020-10-12 CN CN202011085163.6A patent/CN112095628A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108702A (en) * | 2009-12-25 | 2011-06-29 | 上海市基础工程有限公司 | Lowered underground continuous wall construction process |
| CN102505699A (en) * | 2011-10-12 | 2012-06-20 | 同济大学建筑设计研究院(集团)有限公司 | Advanced plain concrete wall system for controlling deformation of deep foundation pit, and design method thereof |
| CN105568958A (en) * | 2015-12-22 | 2016-05-11 | 上海市基础工程集团有限公司 | Variable cross-section underground diaphragm wall and construction method |
| CN105970916A (en) * | 2016-06-30 | 2016-09-28 | 中铁十八局集团第五工程有限公司 | Construction method for plain concrete underground diaphragm wall of deep foundation pit |
| CN212896389U (en) * | 2020-10-12 | 2021-04-06 | 中国建筑第四工程局有限公司 | Structure for controlling deformation of foundation pit |
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