CN111894036B - Construction method for additionally arranging basement on strip-shaped foundation building - Google Patents
Construction method for additionally arranging basement on strip-shaped foundation building Download PDFInfo
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- CN111894036B CN111894036B CN202010532504.3A CN202010532504A CN111894036B CN 111894036 B CN111894036 B CN 111894036B CN 202010532504 A CN202010532504 A CN 202010532504A CN 111894036 B CN111894036 B CN 111894036B
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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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- 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 adding a basement to a strip-shaped foundation building, which comprises the following steps: (1) The method comprises the steps that wall clamping beams are arranged on two sides of an original bearing wall to form a top plate beam, and a underpinning mechanism is arranged on the wall clamping beams corresponding to the position of a foundation; (2) Excavating earth downwards to the bottom surface of the original foundation, arranging a reinforced wall body with a reinforced structure along the inner side of the original bearing wall at the outermost edge, and completely dismantling the original bearing wall from the part below the roof beam and the corresponding original foundation; (3) Adopting a layered excavation mode to excavate earthwork downwards layer by layer; (4) 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 set the bearing structure in the basement additionally-arranged process, can achieve the effect of 'one beam for two purposes' in the construction process, reduces the setting 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 adding a basement to a strip-shaped foundation building.
Background
The strip foundation is 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 strip foundation. The length of the strip-shaped base is greater than or equal to 10 times its width. The bar-shaped foundation is characterized in that the bar-shaped foundation is arranged on one axis and is intersected with more than two axes, and is sometimes connected with the independent foundation, but the cross section size is different from the reinforcement. In addition, the transverse reinforcement is mainly stressed reinforcement, and the longitudinal reinforcement is secondary stressed reinforcement or distributed reinforcement. The main stressing reinforcement is arranged below.
At present, a large number of existing buildings in China mainly adopt low-rise and multi-storey buildings, and the bearing potential of the structure is large. By utilizing the residual foundation bearing capacity increase under the long-term load action of the existing building, the improvement of the additionally arranged underground space can be carried out under the conditions that the foundation is not treated or is slightly treated and the occupied area is not changed, 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 transformation method not only saves land and matched cost, has little influence on surrounding environment, but also reduces investment cost, and is an effective way for realizing green transformation with the purposes of land and material saving.
However, the basement of the strip-shaped foundation building is additionally provided, and a mature construction standard method is lacked, so that the construction process is complicated, the construction period is long, and the development requirement of accelerating transformation of the existing building cannot be met.
Disclosure of Invention
The invention aims to provide a construction method for adding a basement to a strip-shaped foundation building, which can reasonably arrange a bearing structure in the basement adding process, 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.
The aim of the invention is achieved by the following technical scheme:
a construction method for additionally arranging a basement on a strip-shaped 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 arranged with a basement to form a roof beam, and a underpinning mechanism is arranged on the wall clamping beams corresponding to the position of the original foundation, so that the underpinning mechanism replaces the original foundation to play a role in supporting the strip foundation building;
(2) Excavating earth downwards to the bottom surface of the original foundation, so that a space is formed between original bearing walls at the outermost edge, a reinforced wall body with a reinforced 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 roof beam and the corresponding original foundation;
(3) Adopting a layered excavation mode to excavate earthwork downwards layer by layer, and arranging the reinforced wall body in a downward extending mode after each layer of earthwork excavation is completed;
(4) Repeating the step (3) until the depth of the excavated earthwork reaches the target depth, and completing the additional construction work of 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 top plate beam is formed by the wall clamping beams to bear the upper structural load, and the underpinning mechanism is arranged on the wall clamping beams to serve as the first horizontal internal support of the foundation pit supporting system, so that the effect of dual purposes of one beam is achieved, the setting amount of the temporary supporting structure in the construction process is reduced, and meanwhile, the safety in the construction process is improved.
The underpinning mechanism adopts an anchor rod static pressure pile: the wall clamping beam is provided with a support and exchange bearing platform, an anchor rod for a pressed pile is pre-buried on the support and exchange bearing platform, a reserved pile pressing hole in the vertical direction is formed, and the pressed pile is pressed into the reserved pile pressing hole to form a support and exchange mechanism.
The anchor rod static pressure pile adopted by the invention is a pile-pressing implemented by the counterforce provided by an anchor rod anchored in the original foundation, and the pile-pressing is a small-section pile generally and is mainly used for reinforcing the foundation. The method has the advantages that the used machine tool is simple, the operation is easy, the construction period is not influenced, the operation can be performed in a narrow space, the load transmission process and the stress performance are definite, the construction is simple and convenient, and the quality is reliable.
The reinforced connection between the reinforced wall body and the wall clamping beam can be realized by embedding the reinforced steel bars of the reinforced wall body into the wall clamping beam or by embedding the reinforced steel bars into the wall clamping beam. When the reinforcing steel bars are embedded in the wall clamping beam, the wall clamping beam and the reinforcing steel bars for reinforcing the wall are connected in a welding mode.
As one embodiment of the present invention, after the reinforced wall is set in the step (2), a portion of the original foundation protruding inwards from the reinforced wall is chiseled.
According to the invention, according to the actual construction requirement, 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 that the strength and reliability of the side wall are further improved.
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 top plate beam is formed by the wall clamping beams to bear the upper structural load, and the underpinning mechanism is arranged on the wall clamping beams to serve as the first horizontal internal support of the foundation pit supporting system, so that the effect of dual-purpose one beam is achieved, the setting quantity of the 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 along the periphery of the basement of the strip-shaped foundation building and serve as the enclosure structures of the outer wall of the basement and the foundation pit, so that a vertical bearing system which is formed by reverse operation is formed; and adopt the mode of layering excavation, dig one deck earthwork from the top down, a layer of basement beam slab structure is pour to a soil mould together, after reaching certain intensity, can regard as the interior horizontal support of envelope to satisfy the safety requirement of continuing the construction down.
3. The method can improve the safety of underground engineering, shorten the construction period and prevent the surrounding foundation 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 diagram of a construction method for adding a basement according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a reinforcement plane of a static pressure steel pipe pile of a foundation anchor rod according to an embodiment of the invention.
FIG. 3 is a schematic diagram showing a construction method flow of adding a basement according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a construction method flow of adding a basement according to an embodiment of the present invention.
FIG. 5 is a schematic diagram showing a construction method flow of adding a basement according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a construction method flow of adding a basement according to an embodiment of the present invention.
FIG. 7 is a sixth schematic diagram of a construction method for adding a basement according to an embodiment of the present invention.
FIG. 8 is a schematic diagram of a construction method flow for adding a basement according to an embodiment of the present invention.
FIG. 9 is a schematic diagram of a construction method for adding a basement according to an embodiment of the present invention.
Reference numerals: 1-a steel pipe pile; 2-a basement is to be added; 3-underpinning the bearing platform; 4-wall clamping beams; 5-an original bearing wall body; 6-primordial foundation; 7-reinforced concrete retaining walls; 8-primary basal bulge; 9-an internal foundation; 10-steel support; 11-basement floor; 12-basement side wall.
Detailed Description
The invention is further illustrated by the following specific examples.
The concrete construction steps of the construction method for adding the basement to the strip-shaped foundation building are as follows:
(1) As shown in fig. 1 and 2, an original bottom plate of a strip-shaped foundation building to be added with a basement 2 is taken as a top plate (not shown) of the basement, two sides of the original bearing wall body 5, which is close to an original foundation 6, are provided with wall clamping beams 4, the original bearing wall body 5 is clamped between the two sides of the original bearing wall body 4 to form a top plate beam system, a support platform 3 is arranged on the wall clamping beams 4 corresponding to the original foundation 6, an anchor rod for a compression pile is pre-buried on the support platform 3, and a reserved pile pressing hole is arranged;
(2) Performing anchor rod static pressure pile construction, namely pressing a steel pipe pile 1 into a reserved pile pressing hole on a underpinning bearing platform 3, determining the length of the steel pipe pile 1 according to the design requirement of a foundation, and performing anchor rod static pressure pile construction after drilling through the original foundation 6 by adopting a drilling machine if the width of the original foundation 6 influences pile position arrangement;
(3) As shown in fig. 3, the earth is excavated to the bottom surface of the original foundation 6, so that a space is formed between the top plate, the bottom surface and the original bearing wall 5 at the outermost edge, a reinforced concrete retaining wall 7 is poured at a position between the top plate and the bottom surface inside the original bearing wall 5, and a reinforced bar connection exists between the reinforced concrete retaining wall 7 and the wall clamping beam 4, which can be realized by embedding the reinforced bars of the reinforced concrete retaining wall 7 into the wall clamping beam 4 or by embedding the reinforced bars in the wall clamping 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 protruding 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 inner foundation 9;
(5) As shown in fig. 5, the earth is excavated continuously below the bottom surface by adopting a layered excavation mode, and a horizontal steel support 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 layered excavation process, after each layer of earth excavation is completed, continuing to arrange the reinforced concrete retaining wall 7 downwards along the reinforced concrete retaining wall 7 of the upper layer, and after the strength of the reinforced concrete retaining wall 7 reaches the design requirement, continuing to excavate the next layer;
(7) As shown in fig. 7 to 9, the above steps (5) and (6) are repeated until the depth of the excavated earth reaches the designed depth of the basement 2 to be added, the basement bottom plate 11 is horizontally arranged at the bottom of the space, the steel support 10 is removed, and the basement addition is completed after the construction of the basement side wall 12 is performed on the surface of the reinforced concrete retaining wall 7.
It should be noted that the above-mentioned embodiments are merely for further explanation of the present invention and are not intended to limit the present invention, and any modifications or variations within the meaning and scope of the technical solutions of the present invention, which are considered to be included in the scope of the present invention by those skilled in the art.
Claims (5)
1. The construction method for additionally arranging the basement on the strip-shaped foundation building is characterized by comprising the following steps of:
(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 arranged with a basement to form a roof beam, and a underpinning mechanism is arranged on the wall clamping beams corresponding to the position of the original foundation, so that the underpinning mechanism replaces the original foundation to play a role in supporting the strip foundation building; the underpinning mechanism adopts an anchor rod static pressure pile: a support and exchange bearing platform is arranged on the wall clamping beam, an anchor rod for a pile pressing is pre-buried on the support and exchange bearing platform, a reserved pile pressing hole in the vertical direction is arranged, and a pile pressing in the reserved pile pressing hole is pressed into the pile pressing hole to form a support and exchange mechanism;
(2) Excavating earth downwards to the bottom surface of the original foundation, so that a space is formed between original bearing walls at the outermost edge, a reinforced wall body with a reinforced 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 roof beam and the corresponding original foundation; the reinforced wall body and the wall clamping beam are connected by forming a reinforced bar, and the reinforced bar of the reinforced wall body is implanted into the wall clamping beam;
(3) Adopting a layered excavation mode to excavate earthwork downwards layer by layer, and arranging the reinforced wall body in a downward extending mode after each layer of earthwork excavation is completed;
(4) Repeating the step (3) until the depth of the excavated earthwork reaches the target depth, and completing the additional construction work of the basement after the basement bottom plate is arranged.
2. The method for constructing the additional basement of the strip-type foundation building according to claim 1, wherein the reinforcing wall body and the wall clamping beam are connected by embedding reinforcing steel bars in the wall clamping beam and connecting the reinforcing steel bars of the reinforcing wall body in a welding mode.
3. The method for constructing a basement for a strip-type foundation building according to claim 1, wherein the step (2) is performed by chiseling out a portion of the original foundation protruding inwards from the reinforced wall after the reinforced wall is provided.
4. The method for constructing an additional basement in a strip-type foundation structure according to claim 1, wherein in the step (3), a horizontal steel support structure is constructed between the reinforced walls.
5. The method for constructing an additional basement for a bar-type foundation structure according to claim 1, wherein in the step (4), a layer of basement side walls is further constructed on the surface of the reinforced wall.
Priority Applications (1)
| 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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| 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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| CN111894036B true CN111894036B (en) | 2023-05-12 |
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| 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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| 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 |
| CN104453274B (en) * | 2014-11-25 | 2016-02-17 | 山东建筑大学 | Utilize supporting and protection structure and underpinning structure to support existing building underground and increase layer method |
| CN105839946B (en) * | 2016-03-31 | 2018-04-06 | 山东建筑大学 | Building with brick-concrete structure lifts increasing layer method |
| CN106088650B (en) * | 2016-07-19 | 2018-02-09 | 山东建筑大学 | A kind of method and building suitable for building with brick-concrete structure underground increasing 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 |
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