CN112502464A - Reverse construction method for extension basement under existing building - Google Patents
Reverse construction method for extension basement under existing building Download PDFInfo
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- CN112502464A CN112502464A CN202011317341.3A CN202011317341A CN112502464A CN 112502464 A CN112502464 A CN 112502464A CN 202011317341 A CN202011317341 A CN 202011317341A CN 112502464 A CN112502464 A CN 112502464A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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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
- E02D29/05—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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a reverse construction method for expanding a basement below an existing building, which comprises the following steps: step 1: supporting and reinforcing the top plate of the existing basement; step 2: constructing a support structure of a foundation pit and a part of pile foundation on the pit; and step 3: dismantling the first-layer structural slab of the existing basement and constructing a circular ring support system; and 4, step 4: dismantling a second-layer structural slab of the existing basement, and constructing a lower part pile foundation of the pit; and 5: and (3) dismantling the existing basement bottom layer structural slab, upwards supplementing and completely reverse-construction floor slabs, and continuing to downwards perform reverse-construction until the construction is finished after the floor slabs reach the design strength. In the invention, the existing basement is not required to be dismantled during the construction of the supporting structure, and the existing basement is synchronously dismantled when a newly-built foundation pit is constructed in a reverse manner; the existing two-layer basement is dismantled, and the ring support system is newly built to be used as a part of the reverse construction permanent structure.
Description
Technical Field
The invention relates to the field of building construction, in particular to a reverse construction method for an extension basement below an existing building.
Background
With the development of the times, the land resources are more and more tense, and people begin to develop underground spaces of old buildings. The existing method is to backfill and reinforce the basement of the old building after demolishing the basement and then develop a new basement space, and the method wastes a lot of time and money, consumes a lot of raw materials, has large influence on the surrounding environment and does not accord with the green construction concept.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a reverse construction method for expanding a basement under an existing building, which has a short construction period and low cost.
Disclosure of Invention
The invention provides a reverse construction method for an extension basement below an existing building, which aims to solve the technical problem.
In order to solve the technical problem, the invention provides a reverse construction method for expanding a basement below an existing building, which comprises the following steps:
step 1: supporting and reinforcing the top plate of the existing basement;
step 2: constructing a support structure of a foundation pit and a part of pile foundation on the pit;
and step 3: dismantling the first-layer structural slab of the existing basement and constructing a circular ring support system;
and 4, step 4: dismantling a second-layer structural slab of the existing basement, and constructing a lower part pile foundation of the pit;
and 5: and (3) dismantling the existing basement bottom layer structural slab, upwards supplementing and completely reverse-construction floor slabs, and continuing to downwards perform reverse-construction until the construction is finished after the floor slabs reach the design strength.
Preferably, in step 1, an H-shaped steel column is used to support and reinforce the top plate of the existing basement.
Preferably, the H-shaped steel column is connected with the structural plate through a head plate.
Preferably, the ring support system is designed based on a permanent structure drawing, and the ring support system is embedded into the permanent structure.
Preferably, in steps 3 to 5, the original uplift pile is used as a temporary support column.
Preferably, before the construction of the pile foundation, the method also comprises the step of pulling out the old pile of the existing building.
Preferably, the pile foundation is constructed on the top of the existing basement and is arranged from the opening of the top plate of the basement to the bottom of the bottom plate of the basement.
Preferably, in the region formed by the top plate to the bottom plate of the existing basement, the pile foundations are all constructed by steel sleeve dado.
Compared with the prior art, the reverse construction method for the expansion basement below the existing building has the following advantages:
1. according to the invention, the existing basement is not required to be completely removed and backfilled, and then a new basement space is developed, only part of the existing basement is required to be removed synchronously during reverse construction of a newly-built foundation pit, so that a great deal of time, money and raw materials are saved, and the influence on the surrounding environment is small;
2. when the existing two-layer basement is dismantled, the newly-built ring support system is used as a part of the reverse construction permanent structure, and the construction cost is reduced.
Drawings
Fig. 1 is a flowchart of a reverse construction method for expanding a basement under an existing building according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a ring support system in a top-down construction method for expanding a basement under an existing building according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reverse construction method for expanding a basement under an existing building according to an embodiment of the present invention.
In the figure: 10-underground continuous wall, 20-upright post piles, 31-B0 plates, 32-B1 plates, 33-bottom plate and 40-circular support system.
Detailed Description
In order to more thoroughly express the technical scheme of the invention, the following specific examples are listed to demonstrate the technical effect; it is emphasized that these examples are intended to illustrate the invention and are not to be construed as limiting the scope of the invention.
The invention provides a reverse construction method for expanding a basement under an existing building, which comprises the following steps as shown in figures 1 to 3:
step 1: supporting and reinforcing an existing basement top plate, specifically, supporting and reinforcing the existing basement top plate by using an H-shaped steel column, wherein in the embodiment, the H-shaped steel column is connected with a structural plate (a second and third … … -layer structural plate of a basement or a bottom-layer structural plate of the basement) through a head plate;
step 2: constructing a building enclosure of a foundation pit and a part of pile foundations on the pit, specifically, the building enclosure of the foundation pit in the application adopts a building enclosure form combining an underground continuous wall 10 and a vertical column pile 20, and please refer to fig. 3 specifically;
and step 3: dismantling the first-layer structural slab of the existing basement and pouring a cushion layer to the bottom elevation of the bent frame, wherein H-shaped steel columns for supporting and reinforcing are dismantled before dismantling; then, constructing a circular ring support system 40, wherein the circular ring support system 40 is as shown in fig. 2, specifically, in this embodiment, the circular ring support system 40 is designed based on a permanent structure drawing, and the circular ring support system 40 is embedded into the permanent structure as a part of a reverse permanent structure, so that the resource waste is reduced and the project period is greatly shortened; it should be noted that the circular ring support system 40 of the existing basement area and the B0 plate 31 structure of the newly-built area are constructed synchronously, and the basement structure B0 plate 31 and the circular ring support system 40 are connected with the enclosure structure through the top ring beam of the underground continuous wall 10.
And 4, step 4: and after the B0 board 31 reaches the strength, continuously removing the next structural floor slab of the original basement until reaching the bottom plate. In the embodiment, the second-layer structural plate of the existing basement is dismantled, the part of the pile foundation under the construction pit is removed, the old pile of the existing building is firstly pulled out before the pile foundation is constructed, and meanwhile, the pile foundation constructed at the top of the existing basement is drilled from the top plate of the basement to the bottom of the bottom plate of the basement, and a full-circle rotary drilling machine is adopted to remove obstacles;
and 5: and (3) dismantling the existing basement bottom layer structural slab, upwards supplementing and completely reverse-construction floor slabs, and continuing to downwards perform reverse-construction until the construction is finished after the floor slabs reach the design strength. Specifically, the residual engineering piles and one pile are firstly constructed on the original old bottom plate, after the strength of the one pile and the one pile is reached, the original bottom plate of the basement is broken, soil is dug to the construction elevation of the B1 plate 32, and a concrete cushion layer with the thickness of 150mm is poured in time until the construction of the bottom plate 33 is finished.
The construction method organically combines the existing basement dismantling and the newly-built foundation pit reverse construction, and achieves the purposes of saving the construction period and reducing the construction cost.
Preferably, in step 3 to 5, regard original uplift pile as temporary support column, this application regards ring support system 40 as the horizontal support structure who demolishs the basement stage, and the temporary support post utilizes near uplift pile to finely tune its pile position, and make full use of original uplift pile is as temporary support column, does not additionally increase stand stake 20 to practice thrift engineering cost.
Preferably, in the area formed by the top plate to the bottom plate of the existing basement, the pile foundation is constructed by the steel sleeve retaining wall, specifically, in the area formed by the top plate to the bottom plate of the existing basement, the height difference is large (about 10m in the embodiment), the pile holes of the part are in a full-face-to-empty state, the water level difference is large, the phenomena of hole wall collapse, piping and the like are easily caused, and therefore the pile foundation in the area is constructed by the steel sleeve retaining wall to solve the water level difference problem. The specific construction method comprises the following steps: the full sleeve is lowered to the position below 2m of the bottom plate of the existing basement, after the steel upright posts or the lattice posts are adjusted to be vertical and concrete pouring is finished, stones are backfilled in the sleeve to the first layer of the existing basement, and the verticality of the upright posts is guaranteed.
In summary, the reverse construction method for expanding the basement under the existing building provided by the invention comprises the following steps: step 1: supporting and reinforcing the top plate of the existing basement; step 2: constructing a support structure of a foundation pit and a part of pile foundation on the pit; and step 3: dismantling the first-layer structural slab of the existing basement and constructing a ring support system 40; and 4, step 4: dismantling a second-layer structural slab of the existing basement, and constructing a lower part pile foundation of the pit; and 5: and (3) dismantling the existing basement bottom layer structural slab, upwards supplementing and completely reverse-construction floor slabs, and continuing to downwards perform reverse-construction until the construction is finished after the floor slabs reach the design strength. According to the invention, the existing basement is not required to be completely removed and backfilled, and then a new basement space is developed, only part of the existing basement is required to be removed synchronously during reverse construction of the newly-built foundation pit, so that a great deal of time, money and raw materials are saved, and the influence on the surrounding environment is small.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A reverse construction method for expanding a basement below an existing building is characterized by comprising the following steps:
step 1: supporting and reinforcing the top plate of the existing basement;
step 2: constructing a support structure of a foundation pit and a part of pile foundation on the pit;
and step 3: dismantling the first-layer structural slab of the existing basement and constructing a circular ring support system;
and 4, step 4: dismantling a second-layer structural slab of the existing basement, and constructing a lower part pile foundation of the pit;
and 5: and (3) dismantling the existing basement bottom layer structural slab, upwards supplementing and completely reverse-construction floor slabs, and continuing to downwards perform reverse-construction until the construction is finished after the floor slabs reach the design strength.
2. The reverse construction method for expanding the basement under the existing building according to claim 1, wherein in the step 1, the top plate of the existing basement is supported and reinforced by H-shaped steel columns.
3. The reverse construction method for expanding the basement under the existing building according to claim 2, wherein the H-shaped steel columns are connected with the structural plates through the head plates.
4. The reverse construction method of the basement under the existing building according to claim 1, wherein the ring support system is designed based on a permanent structure drawing and embedded into the permanent structure.
5. The reverse construction method of the basement under the existing building according to claim 1, wherein the existing uplift pile is used as a temporary supporting column in steps 3 to 5.
6. The method of claim 1, further comprising removing the old pile of the existing building before constructing the pile foundation.
7. The method of claim 1, wherein the pile foundation is installed on top of an existing basement from the top of the basement to the bottom of the basement.
8. The method of claim 1, wherein the piles are constructed by using steel casing walls in the area from the top plate to the bottom plate of the existing basement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011317341.3A CN112502464B (en) | 2020-11-23 | 2020-11-23 | Reverse construction method for extension basement under existing building |
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| CN202011317341.3A CN112502464B (en) | 2020-11-23 | 2020-11-23 | Reverse construction method for extension basement under existing building |
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| CN112502464A true CN112502464A (en) | 2021-03-16 |
| CN112502464B CN112502464B (en) | 2022-07-05 |
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Citations (6)
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| CN104532957A (en) * | 2014-12-08 | 2015-04-22 | 江苏中南建筑产业集团有限责任公司 | Inversed construction method for adding basement in existing building |
| CN104912098A (en) * | 2015-06-01 | 2015-09-16 | 中建四局第六建筑工程有限公司 | Combined construction method for supporting beam plate and structural plate of deep foundation pit |
| CN107326928A (en) * | 2017-08-02 | 2017-11-07 | 南京叭叭智能科技有限公司 | A kind of part is related to the construction method in the deeper subsurface garage of basement |
| CN108005399A (en) * | 2017-10-31 | 2018-05-08 | 上海市政工程设计研究总院（集团）有限公司 | Add the construction method for building multi-layer underground space under a kind of existing building group |
| KR101960413B1 (en) * | 2019-01-07 | 2019-03-20 | 김준성 | Structure construction method |
| CN110886507A (en) * | 2019-12-11 | 2020-03-17 | 北京中岩智泊科技有限公司 | Method for adding floor and expanding under existing building |
-
2020
- 2020-11-23 CN CN202011317341.3A patent/CN112502464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104532957A (en) * | 2014-12-08 | 2015-04-22 | 江苏中南建筑产业集团有限责任公司 | Inversed construction method for adding basement in existing building |
| CN104912098A (en) * | 2015-06-01 | 2015-09-16 | 中建四局第六建筑工程有限公司 | Combined construction method for supporting beam plate and structural plate of deep foundation pit |
| CN107326928A (en) * | 2017-08-02 | 2017-11-07 | 南京叭叭智能科技有限公司 | A kind of part is related to the construction method in the deeper subsurface garage of basement |
| CN108005399A (en) * | 2017-10-31 | 2018-05-08 | 上海市政工程设计研究总院（集团）有限公司 | Add the construction method for building multi-layer underground space under a kind of existing building group |
| KR101960413B1 (en) * | 2019-01-07 | 2019-03-20 | 김준성 | Structure construction method |
| CN110886507A (en) * | 2019-12-11 | 2020-03-17 | 北京中岩智泊科技有限公司 | Method for adding floor and expanding under existing building |
Non-Patent Citations (1)
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