CN111894036A - Construction method for additionally arranging basement in strip foundation building - Google Patents
Construction method for additionally arranging basement in strip foundation building Download PDFInfo
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- CN111894036A CN111894036A CN202010532504.3A CN202010532504A CN111894036A CN 111894036 A CN111894036 A CN 111894036A CN 202010532504 A CN202010532504 A CN 202010532504A CN 111894036 A CN111894036 A CN 111894036A
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- underpinning
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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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- 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
- 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
- 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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method for additionally arranging basements on a strip foundation building, which comprises the following steps: (1) the method comprises the following steps that wall clamping beams are arranged on two sides of an original bearing wall to form a top plate beam, and underpinning mechanisms are arranged on the wall clamping beams corresponding to the position of an original foundation; (2) excavating earth downwards to the bottom surface of the original foundation, arranging a reinforced wall body with a steel bar structure along the inner side of the original bearing wall at the outermost edge, and completely removing the original bearing wall from the part below the top plate beam and the corresponding original foundation; (3) adopting a layered excavation mode to excavate earthwork layer by layer downwards; (4) and (5) repeating the step (3) until the depth of the excavated earthwork reaches the target depth, and setting a basement bottom plate. The method can reasonably arrange the bearing structure in the process of additionally arranging the basement, can achieve the effect of 'one beam for two purposes' in the construction process, reduces the arrangement of the bearing structure, is safe and reliable, can simplify the construction process, and improves the construction efficiency.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method for additionally arranging basements on a strip foundation building.
Background
The strip foundation refers to a foundation form with the length far greater than the width, and can be divided into a strip foundation under a wall and a strip foundation under a column according to the upper structure of the foundation form. The length of the strip-shaped foundation is greater than or equal to 10 times of the width of the strip-shaped foundation. The strip foundation is characterized in that the strip foundation is arranged on one axis and is intersected with more than two axes, and sometimes is connected with an independent foundation, but the section size is different from the reinforcing bars. In addition, the transverse reinforcing bars are main stressed reinforcing bars, and the longitudinal reinforcing bars are secondary stressed reinforcing bars or distributed reinforcing bars. The main stressed steel bars are arranged below.
At the present stage, a large number of existing buildings in China mainly comprise low-rise and multi-rise buildings, and the structure has large bearing potential. By utilizing the increase surplus of the bearing capacity of the foundation under the long-term load action of the existing building, the additional underground space reconstruction can be carried out under the condition that the foundation is not processed or is slightly processed and the floor area is not changed, so that the building area is greatly increased, the building density of the area is improved, and the existing building and land resources are fully utilized. The reconstruction method not only saves land acquisition and matching cost, has little influence on the surrounding environment, but also reduces the investment cost, and is an effective way for realizing green reconstruction with the purpose of saving land and materials.
However, the basement of the strip foundation building is additionally arranged at present, a mature construction standard method is lacked, so that the construction process is complicated, the construction period is long, and the development requirement of the existing building for accelerated reconstruction cannot be met.
Disclosure of Invention
The invention aims to provide a construction method for additionally arranging a basement in a strip foundation building, which can reasonably arrange a bearing structure in the process of additionally arranging the basement, can achieve the effect of dual purposes of one beam in the construction process, reduces the arrangement of the bearing structure, is safe and reliable, can simplify the construction process and improves the construction efficiency.
The purpose of the invention is realized by the following technical scheme:
a construction method for additionally arranging basements on a strip foundation building comprises the following steps:
(1) the method comprises the steps that wall clamping beams are arranged on two sides of an original bearing wall, close to an original foundation, of a strip foundation building to be additionally provided with a basement to form a top plate beam, and underpinning mechanisms are arranged on the wall clamping beams corresponding to the position of the original foundation, so that the underpinning mechanisms can replace the original foundation to support the strip foundation building;
(2) excavating earth downwards to the bottom surface of the original foundation, so that a space is enclosed between original bearing walls at the outermost edge, a reinforced wall body with a steel bar structure is arranged along the inner side of the original bearing walls at the outermost edge, and the original bearing walls in the space are completely removed from the part below the top plate beam and the corresponding original foundation;
(3) excavating earthwork layer by layer downwards by adopting a layered excavation mode, and extending the reinforced wall downwards after the excavation of each layer of earthwork is finished;
(4) and (4) repeating the step (3) until the depth of the excavated earthwork reaches the target depth, and finishing the construction work of adding the basement after the basement bottom plate is arranged.
According to the construction method, the wall clamping beams are arranged on two sides of the original bearing wall, the wall clamping beams form a top plate beam bearing upper structure load, and the underpinning mechanism is arranged on the wall clamping beams and used as a first horizontal inner support of a foundation pit supporting system, so that the effect of one beam for two purposes is achieved, the arrangement amount of a temporary supporting structure in the construction process is reduced, and meanwhile, the safety in the construction process is improved.
The underpinning mechanism of the invention adopts an anchor rod static pressure pile: the underpinning mechanism is characterized in that the wall clamping beam is provided with an underpinning bearing platform, an anchor rod for pressing a pile is pre-buried in the underpinning bearing platform, a reserved pile pressing hole in the vertical direction is formed in the underpinning bearing platform, and the pressed pile is pressed into the reserved pile pressing hole to form the underpinning mechanism.
The anchor static pressure pile adopted by the invention is formed by pressing the pile by using the counter force provided by the anchor rod anchored in the original foundation, and the pressed pile is generally a small-section pile and is mainly used for reinforcing the foundation. Its advantages are simple machine, easy operation, no influence to construction period, narrow space, high load transfer performance and stress performance, simple construction and high reliability.
The reinforced wall body and the wall clamping beam form steel bar connection, and the steel bar connection can be realized by implanting the steel bar of the reinforced wall body into the wall clamping beam or by pre-embedding the steel bar in the wall clamping beam. When the reinforcing steel bars are pre-embedded in the wall clamping beam, the wall clamping beam is connected with the reinforcing steel bars of the reinforced wall body in a welding mode.
In one embodiment of the present invention, after the reinforcing wall is installed in the step (2), a portion of the original foundation protruding inward from the reinforcing wall is removed by chiseling.
According to actual construction requirements, in the step (3), a horizontal steel support structure is built between the reinforced walls so as to ensure the safety and stability of the foundation pit and the foundation.
In the step (4), a layer of basement side wall is constructed on the surface of the reinforced wall body, so as to further improve the strength and reliability of the side wall.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the wall clamping beams are arranged on two sides of the original bearing wall, the wall clamping beams form a top plate beam bearing upper structure load, and the underpinning mechanism is arranged on the wall clamping beams and used as a first horizontal inner support of a foundation pit supporting system, so that the effect of one beam for two purposes is achieved, the arrangement amount of a temporary supporting structure in the construction process is reduced, and meanwhile, the safety in the construction process is improved.
2. According to the construction method, continuous reinforced walls are constructed around the basement of the strip-shaped foundation building and are used as the enclosing structures of the basement outer wall and the foundation pit, so that a reverse vertical bearing system is formed; and a layer of earthwork is dug from top to bottom by adopting a layered excavation mode, a layer of basement beam-slab structure is poured together with the earth mould, and the basement beam-slab structure can be used as an inner horizontal support of the enclosure structure after reaching a certain strength so as to meet the safety requirement of continuous downward construction.
3. The method can improve the safety of underground engineering, shorten the construction period and prevent surrounding foundations from sinking, and is a technology with development prospect and popularization value.
Drawings
The invention is further illustrated by the following figures.
FIG. 1 is a schematic view of a flow of a construction method for adding basements according to an embodiment of the present invention.
FIG. 2 is a schematic plane view of reinforcement of a foundation anchor rod static pressure steel pipe pile according to an embodiment of the invention.
FIG. 3 is a schematic view of a second construction method for adding basements according to the embodiment of the present invention.
FIG. 4 is a third schematic view of a flow of a construction method for adding basements according to an embodiment of the invention.
FIG. 5 is a fourth schematic view of a flow of a construction method for adding basements according to the embodiment of the invention.
Fig. 6 is a five schematic view of a flow of a construction method for additionally arranging a basement in an embodiment of the invention.
Fig. 7 is a six schematic diagram of a construction method for adding basements according to the embodiment of the invention.
Fig. 8 is a seventh schematic view of a construction method for adding basements according to the embodiment of the invention.
Fig. 9 is an eighth schematic view of a flow of a construction method for adding basements according to an embodiment of the present invention.
Reference numerals: 1-steel pipe pile; 2, arranging basements; 3-underpinning the bearing platform; 4-clamping the wall beam; 5-original load-bearing wall body; 6-original basis; 7-reinforced concrete dado; 8-the original base projection; 9-internal foundation; 10-steel support; 11-basement floor; 12-basement side walls.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The construction method for additionally arranging the basement in the strip foundation building comprises the following specific construction steps:
(1) as shown in fig. 1 and 2, an original bottom plate of a strip foundation building to be additionally provided with a basement 2 is used as a top plate (not shown) of the basement, wall clamping beams 4 are arranged on two sides of an original bearing wall 5 close to an original foundation 6, the original bearing wall 5 is clamped in the middle by the wall clamping beams 4 on the two sides to form a top plate beam system, a underpinning bearing platform 3 is arranged on the wall clamping beams 4 corresponding to the original foundation 6, an anchor rod for a pile is pre-embedded on the underpinning bearing platform 3, and a reserved pile pressing hole is arranged;
(2) performing anchor rod static pressure pile construction, pressing the steel pipe pile 1 into a reserved pile pressing hole on the underpinning bearing platform 3, determining the length of the steel pipe pile 1 according to the design requirement of the foundation, and if the width of the original foundation 6 influences the pile position arrangement, drilling through the original foundation 6 by using a drilling machine, and then performing anchor rod static pressure pile construction;
(3) as shown in fig. 3, excavating earth to the bottom surface of an original foundation 6, so that a space is formed between the top plate, the bottom surface and an original bearing wall 5 at the outermost edge, pouring a reinforced concrete retaining wall 7 at a position between the top plate and the bottom surface on the inner side of the original bearing wall 5, wherein the reinforced concrete retaining wall 7 is connected with a wall beam 4 through reinforcing steel bars, and the method can be realized by implanting the reinforcing steel bars of the reinforced concrete retaining wall 7 into the wall beam 4 or by embedding the reinforcing steel bars in the wall beam 4;
(4) as shown in fig. 4, after the strength of the reinforced concrete retaining wall 7 meets the design requirement, chiseling the original foundation protruding part 8 of the wall surface of the reinforced concrete retaining wall 7, which protrudes inwards from the original foundation 6 at the outermost edge, and completely removing the original bearing wall 5 in the space from the part below the roof beam and the internal foundation 9;
(5) as shown in fig. 5, earth is excavated continuously below the bottom surface by adopting a layered excavation mode, and horizontal steel supports 10 can be built between the reinforced concrete retaining walls 7 according to the excavation depth so as to ensure the safety and stability of the foundation pit and the foundation;
(6) as shown in fig. 6, in the process of layered excavation, after each layer of earth excavation is completed, the reinforced concrete retaining wall 7 is continuously arranged downwards along the reinforced concrete retaining wall 7 of the previous layer, and after the strength of the reinforced concrete retaining wall 7 meets the design requirement, the next layer is continuously excavated;
(7) as shown in fig. 7 to 9, the steps (5) and (6) are repeated until the excavated earthwork depth reaches the design depth of the basement 2 to be added, a basement bottom plate 11 is horizontally arranged at the bottom of the space, the steel supports 10 are removed, and the basement is added after the construction of the basement side wall 12 is carried out on the surface of the reinforced concrete retaining wall 7.
It should be noted that the above-mentioned embodiments are only illustrative and not restrictive, and any modifications or changes within the meaning and range of equivalents to the technical solutions of the present invention by those skilled in the art should be considered to be included in the protection scope of the present invention.
Claims (7)
1. A construction method for additionally arranging basements on a strip foundation building is characterized by comprising the following steps:
(1) the method comprises the steps that wall clamping beams are arranged on two sides of an original bearing wall, close to an original foundation, of a strip foundation building to be additionally provided with a basement to form a top plate beam, and underpinning mechanisms are arranged on the wall clamping beams corresponding to the position of the original foundation, so that the underpinning mechanisms can replace the original foundation to support the strip foundation building;
(2) excavating earth downwards to the bottom surface of the original foundation, so that a space is enclosed between original bearing walls at the outermost edge, a reinforced wall body with a steel bar structure is arranged along the inner side of the original bearing walls at the outermost edge, and the original bearing walls in the space are completely removed from the part below the top plate beam and the corresponding original foundation;
(3) excavating earthwork layer by layer downwards by adopting a layered excavation mode, and extending the reinforced wall downwards after the excavation of each layer of earthwork is finished;
(4) and (4) repeating the step (3) until the depth of the excavated earthwork reaches the target depth, and finishing the construction work of adding the basement after the basement bottom plate is arranged.
2. The construction method for adding basements to the strip-shaped foundation building according to claim 1, wherein the underpinning mechanism adopts an anchor rod static pressure pile: the underpinning mechanism is characterized in that the wall clamping beam is provided with an underpinning bearing platform, an anchor rod for pressing a pile is pre-buried in the underpinning bearing platform, a reserved pile pressing hole in the vertical direction is formed in the underpinning bearing platform, and the pressed pile is pressed into the reserved pile pressing hole to form the underpinning mechanism.
3. The construction method of the bar-type foundation building with the additional basement according to claim 1, wherein the reinforcing wall is connected with the wall-clamping beam through reinforcing steel bars, and the reinforcing steel bars are embedded into the wall-clamping beam.
4. The construction method of adding basement to strip foundation building according to claim 1,
the reinforced wall body is connected with the wall clamping beam through steel bars which are embedded in the wall clamping beam in advance, and the reinforced wall body is connected with the steel bars of the reinforced wall body in a welding mode.
5. The construction method of the strip foundation building with the additional basement according to claim 1, wherein after the reinforced wall is arranged in the step (2), the part of the original foundation protruding inwards beyond the reinforced wall is chiseled.
6. The construction method of the strip foundation building with the added basement according to claim 1, wherein in the step (3), a horizontal steel support structure is built between the reinforced walls.
7. The method for constructing a basement in a strip foundation building according to claim 1, wherein in the step (4), a basement side wall is constructed on the surface of the reinforced wall.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010532504.3A CN111894036B (en) | 2020-06-12 | 2020-06-12 | Construction method for additionally arranging basement on strip-shaped foundation building |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010532504.3A CN111894036B (en) | 2020-06-12 | 2020-06-12 | Construction method for additionally arranging basement on strip-shaped foundation building |
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| CN111894036A true CN111894036A (en) | 2020-11-06 |
| CN111894036B CN111894036B (en) | 2023-05-12 |
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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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102220769A (en) * | 2011-04-15 | 2011-10-19 | 上海天演建筑物移位工程有限公司 | System and method for underpinning and jacking building and adding storeys downwards |
| CN104453274A (en) * | 2014-11-25 | 2015-03-25 | 山东建筑大学 | Method for supporting underground layer increasing of existing building by supporting structure and underpinning structure |
| CN105839946A (en) * | 2016-03-31 | 2016-08-10 | 山东建筑大学 | Brick-concrete structure building lifting add-layer method |
| CN106088650A (en) * | 2016-07-19 | 2016-11-09 | 山东建筑大学 | A kind of building with brick-concrete structure underground that is applicable to increases method and the building of layer |
| CN108412225A (en) * | 2018-05-17 | 2018-08-17 | 南京赛力克建设工程技术有限公司 | The underground of existed building adds a layer construction method |
-
2020
- 2020-06-12 CN CN202010532504.3A patent/CN111894036B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220769A (en) * | 2011-04-15 | 2011-10-19 | 上海天演建筑物移位工程有限公司 | System and method for underpinning and jacking building and adding storeys downwards |
| CN104453274A (en) * | 2014-11-25 | 2015-03-25 | 山东建筑大学 | Method for supporting underground layer increasing of existing building by supporting structure and underpinning structure |
| CN105839946A (en) * | 2016-03-31 | 2016-08-10 | 山东建筑大学 | Brick-concrete structure building lifting add-layer method |
| CN106088650A (en) * | 2016-07-19 | 2016-11-09 | 山东建筑大学 | A kind of building with brick-concrete structure underground that is applicable to increases method and the building of layer |
| CN108412225A (en) * | 2018-05-17 | 2018-08-17 | 南京赛力克建设工程技术有限公司 | The underground of existed building adds a layer construction method |
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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