CN111021398A - Existing building centralized underpinning structure and method for developing underground space - Google Patents
Existing building centralized underpinning structure and method for developing underground space Download PDFInfo
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- CN111021398A CN111021398A CN201911356585.XA CN201911356585A CN111021398A CN 111021398 A CN111021398 A CN 111021398A CN 201911356585 A CN201911356585 A CN 201911356585A CN 111021398 A CN111021398 A CN 111021398A
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- existing building
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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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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- 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)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
Abstract
The invention belongs to an existing building centralized underpinning structure and a method thereof for developing underground space under an existing building, wherein the construction method comprises the following steps: the foundation of the existing building is a shallow foundation, the underground space to be developed is positioned at the lower part of the shallow foundation, and the first step is as follows: constructing a pile foundation outside the existing building; step two: constructing a main beam and a wall clamping beam under the existing building, wherein the wall clamping beams are respectively and oppositely arranged at two sides of the lower part of the wall body of the existing building to clamp the wall body, the lifting beams are arranged at intervals to penetrate through the wall body, and two ends of the lifting beams are anchored with the wall clamping beams; the double-walled beam anchor is in the girder, and the both ends anchor of girder is on the pile foundation. Underground space development is carried out on the premise that the existing building is not damaged in large area and protected in situ, the requirement for city updating can be met, the problem of city development is solved, and the original appearance of a historical block can be kept.
Description
Technical Field
The invention belongs to the field of underground space development under existing buildings, and particularly relates to a underpinning structure of an existing building and a construction method thereof, which can be widely applied to underground space development under the existing building.
Background
At the present stage, the clear land available and developed in urban central areas is reduced day by day, on one hand, urban development faces a boundary without land availability, on the other hand, the central urban areas also reserve a large number of existing buildings with historical value and history inheritance, and the urban updating strategy is changed from 'dismantling and reserving' to 'reserving, dismantling' so as to further aggravate the contradiction that urban development is not available. Therefore, the underground space under the existing building is developed to be a necessary way for solving the updating and development of the city.
The underground space is developed under the existing building, so that the safety of the existing building is ensured, more construction spaces are created for the underground space development on the premise of ensuring the safety of the existing building, and the limitation of the ground and the underground to the construction working surface is solved. At the present stage, the protection of the existing building has three schemes of reconstruction, translation and underpinning: the reconstruction causes the greatest damage to the existing building, and the history and cultural value of the building are reduced; the translation requires a large construction site, and the most lacking of the existing dense building groups is a large-area construction site; the conventional underpinning method adopts a dispersive underpinning method, namely, wall clamping beams are arranged below corresponding walls and columns, load is transmitted to the anchor rod static pressure piles at two sides through the lifting beams, the bearing capacity of the anchor rod static pressure piles is small, the number of required anchor rod static pressure piles is large, the anchor rod static pressure piles with large number are barriers for underground space development, the underground construction space is narrow, and the construction requirement of the underground space cannot be met, so the conventional underpinning method is only suitable for existing building protection without underground space development.
Disclosure of Invention
The invention provides a centralized underpinning structure of an existing building for developing an underground space and a method thereof, which can solve the technical problem of the underground construction space while protecting the existing building. Underground space development is carried out on the premise that the existing building is not damaged in large area and protected in situ, the requirement for city updating can be met, the problem of city development is solved, and the original appearance of a historical block can be kept.
The technical scheme of the structure of the invention is as follows: a centralized underpinning structure of an existing building for developing underground space, the foundation of the existing building is a shallow foundation, the underground space to be developed is positioned at the lower part of the shallow foundation, and pile foundations are arranged outside the existing building; the wall clamping beam is arranged below the existing building and is oppositely arranged on two sides of the lower part of the wall body of the existing building to clamp the wall body, the lifting beams are arranged at intervals to penetrate through the wall body, and two ends of the lifting beams are anchored with the wall clamping beams; the double-walled beam anchor is in the girder, and the both ends anchor of girder is on the pile foundation.
Based on the technical characteristics: the pile foundation is a high-frequency resonance-free steel pipe pile or a cast-in-situ bored pile.
Based on the technical characteristics: the main beam is a reinforced concrete prestressed fish-belly beam or a section steel composite beam.
Based on the technical characteristics: the elevation of the main beam bottom is not lower than that of the shallow foundation bottom.
The technical scheme of the method is as follows: a centralized underpinning method for an existing building for developing an underground space, wherein the foundation of the existing building is a shallow foundation, the underground space to be developed is positioned at the lower part of the shallow foundation, and the first step is as follows: constructing a pile foundation outside the existing building; step two: constructing a main beam and a wall clamping beam under the existing building, wherein the wall clamping beams are respectively and oppositely arranged at two sides of the lower part of the wall body of the existing building to clamp the wall body, the lifting beams are arranged at intervals to penetrate through the wall body, and two ends of the lifting beams are anchored with the wall clamping beams; the double-walled beam anchor is in the girder, and the both ends anchor of girder is on the pile foundation.
Based on the technical characteristics: the pile foundation is a high-frequency resonance-free steel pipe pile.
Based on the technical characteristics: the pile foundation is a cast-in-situ bored pile.
Based on the technical characteristics: and carrying out cast-in-situ bored pile construction by adopting low-clearance small pile foundation equipment in a narrow environment.
Based on the technical characteristics: the main beam is a reinforced concrete prestressed fish-belly beam or a section steel composite beam.
Based on the technical characteristics: the elevation of the main beam bottom is not lower than that of the shallow foundation bottom.
The basic concept of the invention is as follows: the method comprises the following steps of firstly constructing a pile foundation outside an existing building, optimizing the pile foundation, and adopting high-frequency resonance-free steel pipe piles or drilling cast-in-place piles and other high-bearing-capacity pile foundations, wherein the bearing capacity of the pile foundation is generally higher than the maximum bearing capacity provided by the anchor static pressure piles in the prior art. When the adjacent building of existing building periphery restricts the construction site, drilling bored concrete pile should adopt and be applicable to under the narrow and small-size pile foundation equipment of low headroom and construct. The type and the number of the pile foundations can be comprehensively determined according to the existing building load, the bearing capacity of the pile foundations and the space required by underground space development. Then constructing a main beam and a wall clamping beam, clamping the lower part of the wall of the existing building by the wall clamping beam, and lifting the wall of the existing building by a lifting beam, wherein the wall comprises a bearing wall and a non-bearing wall; the double-walled beam is anchored in the main beam. The lifting beam transmits the vertical load of the existing building to the wall clamping beam, and the wall clamping beam transmits the load to the main beam; the main beam has large integral span and is arranged below the existing building, and the load of the existing building transmitted by the double-wall beam is transmitted to the pile foundations at two ends; the main beam can adopt a conventional reinforced concrete beam with the same section, and also can adopt a reinforced concrete prestressed fish-bellied beam or a section steel combined beam. In order to reduce the influence of main beam construction excavation on the existing building, the elevation of the main beam bottom is not lower than that of the shallow foundation bottom. Because the girder is the structure of back construction, if the end elevation of girder is less than the shallow foundation end elevation of original existing building, when the girder was under construction, can exert an influence to the shallow foundation, be unfavorable for the protection of existing building. In actual engineering, the girder generally avoids the shallow foundation arrangement, if the girder touches the shallow foundation, part of the shallow foundation can be chiseled at the touch position, and as the load of the existing building can be intensively transferred to the girder after the existing building is intensively underpinned, the safety of the superstructure of the existing building can not be influenced even if the shallow foundation is locally damaged.
Due to the adoption of the centralized underpinning structure and the centralized underpinning method for the existing building, the requirement of in-situ protection of the existing building is met, and the requirement of underground space development and construction space is met, so that the history and culture of a central urban area are effectively inherited, the underground space is effectively utilized in urban updating, land resources are saved, and the development of the city and the improvement of functional quality are promoted.
Drawings
Fig. 1 is a schematic view of the arrangement of the pile foundation in the present invention.
Fig. 2 is a schematic view of a main beam and a double wall beam.
Fig. 3 is a schematic view of excavation of an underground space under an existing building.
Fig. 4 is a schematic view of the connection between the double-wall beam and the wall body.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
The invention satisfies the underground space development under the building through the existing building centralized underpinning structure and the method thereof, realizes the requirement of in-situ protection of the existing building, and satisfies the requirement of underground space development construction space. The following is described in detail with reference to the accompanying drawings:
as shown in fig. 1, pile foundations 2 are arranged outside an existing building 1 according to the bearing capacity and the requirement of a construction space required for underground space development, and the existing building 1 is a shallow foundation. While the pile foundation is being constructed, the existing building 1 can be internally reinforced 3.
As shown in fig. 2, main beams and a double wall beam are arranged under existing building wall columns, and the double wall beam 4 is anchored to the main beams 5. The main beams are anchored to the pile foundations 2. The pile foundation 2 is preferably a high-frequency resonance-free steel pipe pile or a high-bearing capacity pile foundation such as a cast-in-situ bored pile. The main beam is preferably a reinforced concrete prestressed fish-belly beam or a section steel composite beam. As shown in fig. 4, the double-walled beams 4 are respectively and oppositely arranged at two sides of the lower part of the wall body 6 of the existing building to clamp the wall body 6, the lifting beams 7 are arranged at intervals to penetrate through the wall body 6, and two ends of the lifting beams 7 are anchored with the double-walled beams 4.
As shown in fig. 3, after the main beam 5 transmits all the loads of the existing building to the pile foundation 2, the existing building is in a safe and stable state. The construction equipment can carry out earth excavation below the existing building and later-stage underground structure construction operation, thereby developing underground space.
The pile foundation in the invention bears the whole upper load of the existing building and ensures the stability of the existing building. On the girder through the large-span will have the building load to transmit the pile foundation, avoided among the prior art anchor rod static pressure stake of existing building below within range intensive arrangement to the influence of underground space development, satisfied the requirement of underground space development.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. An existing building centralized underpinning structure for developing an underground space, the existing building having a shallow foundation as a foundation, the underground space to be developed being located at a lower portion of the shallow foundation, characterized in that: the pile foundation is arranged outside the existing building; the wall clamping beam is arranged on two sides of the lower part of the wall body of the existing building respectively and oppositely to clamp the wall body, the lifting beams are arranged at intervals to penetrate through the wall body, and two ends of the lifting beams are anchored with the wall clamping beam; the double-walled beam anchors in the girder, the both ends anchor of girder are in on the pile foundation.
2. An existing building centralizing underpinning construction for developing underground space as claimed in claim 1, characterized by: the pile foundation is a high-frequency resonance-free steel pipe pile or a cast-in-situ bored pile.
3. An existing building centralizing underpinning construction for developing underground space as claimed in claim 1, characterized by: the main beam is a reinforced concrete prestressed fish-belly beam or a profile steel composite beam.
4. An existing building centralizing underpinning construction for developing underground space as claimed in claim 1, characterized by: the elevation of the bottom of the main beam is not lower than that of the bottom of the shallow foundation.
5. A centralized underpinning method of an existing building for developing an underground space, the existing building being based on a shallow foundation, the underground space to be developed being located at the lower part of the shallow foundation, characterized in that:
the method comprises the following steps: constructing a pile foundation outside the existing building;
step two: constructing a main beam and a wall clamping beam under the existing building, wherein the wall clamping beams are respectively and oppositely arranged at two sides of the lower part of the wall body of the existing building to clamp the wall body, the lifting beams are arranged at intervals to penetrate through the wall body, and two ends of the lifting beams are anchored with the wall clamping beams; the double-walled beam anchors in the girder, the both ends anchor of girder are in on the pile foundation.
6. An existing building centralized underpinning method for developing underground space as claimed in claim 5 wherein: the pile foundation is a high-frequency resonance-free steel pipe pile.
7. An existing building centralized underpinning method for developing underground space as claimed in claim 5 wherein: the pile foundation is a cast-in-situ bored pile.
8. An existing building centralized underpinning method for developing underground space as claimed in claim 7 wherein: and carrying out cast-in-situ bored pile construction by adopting low-clearance small pile foundation equipment in a narrow environment.
9. An existing building centralized underpinning method for developing underground space as claimed in claim 5 wherein: the main beam is a reinforced concrete prestressed fish-belly beam or a profile steel composite beam.
10. An existing building centralized underpinning method for developing underground space according to claim 5 or 9, characterized in that: the elevation of the bottom of the main beam is not lower than that of the bottom of the shallow foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356585.XA CN111021398A (en) | 2019-12-25 | 2019-12-25 | Existing building centralized underpinning structure and method for developing underground space |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356585.XA CN111021398A (en) | 2019-12-25 | 2019-12-25 | Existing building centralized underpinning structure and method for developing underground space |
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| Publication Number | Publication Date |
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| CN111021398A true CN111021398A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911356585.XA Pending CN111021398A (en) | 2019-12-25 | 2019-12-25 | Existing building centralized underpinning structure and method for developing underground space |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356290A (en) * | 2021-06-25 | 2021-09-07 | 中铁二院华东勘察设计有限责任公司 | Longitudinal wall beam type pile foundation underpinning construction method for underground passage construction |
-
2019
- 2019-12-25 CN CN201911356585.XA patent/CN111021398A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356290A (en) * | 2021-06-25 | 2021-09-07 | 中铁二院华东勘察设计有限责任公司 | Longitudinal wall beam type pile foundation underpinning construction method for underground passage construction |
| CN113356290B (en) * | 2021-06-25 | 2023-03-10 | 中铁二院华东勘察设计有限责任公司 | Longitudinal wall beam type pile foundation underpinning construction method for underground passage construction |
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Inventor after: Weng Qiping Inventor after: Chen Yongcai Inventor after: Wang Weidong Inventor after: Dai Bin Inventor after: Hu Yun Inventor before: Weng Qiping Inventor before: Chen Yongcai Inventor before: Wang Weidong Inventor before: Dai Bin |
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