CN110886507A - Method for adding floor and expanding under existing building - Google Patents
Method for adding floor and expanding under existing building Download PDFInfo
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- CN110886507A CN110886507A CN201911263202.4A CN201911263202A CN110886507A CN 110886507 A CN110886507 A CN 110886507A CN 201911263202 A CN201911263202 A CN 201911263202A CN 110886507 A CN110886507 A CN 110886507A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000009424 underpinning Methods 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 238000010276 construction Methods 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention relates to a method for building a storey under an existing building, which mainly comprises the following steps: (1) reinforcing the weak structural member; (2) constructing a circle of enclosure structure outside the planned underground structure area; (3) constructing underpinning piles around the marked existing building structure walls and/or columns; (4) connecting the existing building structure wall and/or column with the underpinning pile through a connecting member; (5) breaking the original foundation below the existing building structure wall and/or column, and excavating the earth; (6) and (3) sequentially constructing a bottom plate, a structural outer wall, an inner wall, a structural column and a floor slab for constructing the underground structure from bottom to top, and simultaneously performing waterproof construction. The underpinning pile is a high-strength helical blade steel pipe pile and is formed by connecting a plurality of prefabricated rod bodies through screw threads, each prefabricated rod body is divided into two specifications of a helical blade rod body and a smooth round rod body, the helical blade steel pipe pile is a helical drill rod body for pore forming during construction, and meanwhile, the supporting structure for bearing vertical load in the later period is adopted, so that the construction speed is high, and the influence on the environment is small.
Description
Technical Field
The invention relates to a construction method, in particular to a method for building a storey under an existing building.
Background
With the increasing of the urbanization development speed, the land resources are more and more tense, the overground space has short supply and demand, and some regions are already available without land. The development and utilization of the underground space provide possibility for relieving the shortage of urban land, improving urban environment and traffic condition, saving energy, protecting environment and the like.
Under some constructed buildings, due to changes in demand and incompleteness of consideration during planning, additional construction or reconstruction of basements or foundation structure reinforcement by construction in a narrow space is often required. The underpinning pile technology can replace the original building foundation to bear the upper building load, so that the integrity of the upper structure can be ensured. The prior pile foundation technology mostly adopts a driven pile or cast-in-place pile form, the driven pile has high noise, has great influence on the environment and can influence the stability of undisturbed soil; the cast-in-place pile is difficult to ensure the pile quality, so that quality defects of multiple forms such as necking, mud clamping, pile breaking or excessive thick sediment and the like easily occur, the structural integrity and the bearing capacity of the pile body are influenced, and construction supervision and quality detection with great strength are required. Meanwhile, the existing mechanical equipment (such as a crawler-type drilling machine) is overlarge in size, generally higher than the height of a common floor and roof, and is difficult to enter a narrow space below a building for construction, so that the requirement of storey-adding and expansion below the existing building at the current stage is difficult to meet.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a method for building a storey-adding extension under an existing building, which has high construction efficiency, has little influence on the environment, and can greatly shorten the construction period and reduce the engineering cost.
In order to achieve the purpose, the invention adopts the following scheme:
1. a method for building a storey under an existing building is characterized by comprising the following steps:
a. detecting and evaluating the existing building, and reinforcing a weak structural member;
b. marking a proposed underground structure area below an existing building, constructing a circle of enclosure structure outside the proposed underground structure area, wherein the enclosure structure is a support pile or a support wall and is used for resisting lateral soil water pressure during construction of the proposed underground structure area, and simultaneously adding a water-stop curtain when the groundwater level is higher than the bottom height of the proposed underground structure area;
c. marking the planned underground structure area and the existing building structure walls and/or columns around the planned underground structure area, constructing underpinning piles around the marked existing building structure walls and/or columns, wherein the underpinning piles are uniformly and symmetrically arranged, and the number and the length of the underpinning piles are determined by the upper structure load and the soil texture condition;
d. when the existing building foundation is covered with soil, excavating soil of a proposed underground structure area to the top surface of the existing building foundation;
e. connecting the existing building structure wall and/or column with the underpinning pile through a connecting member, so that the load of the existing building is transmitted to the underpinning pile through the existing building structure wall and/or column, and then transmitted to the deep bearing soil layer;
f. breaking the original foundation below the existing building structure wall and/or column;
g. clearing earthwork of the proposed underground structure area to the bottom elevation of the proposed underground structure bottom plate, and arranging a buckling-restrained structure on the exposed part of the underpinning pile in the earthwork clearing process;
h. when the depth of the planned underground structure area is larger, a lateral reinforcing structure is arranged on the building envelope in a layered mode along with the removal of earthwork;
i. sequentially constructing a bottom plate, a structural outer wall, an inner wall, a structural column and a floor slab for planning an underground structure from bottom to top, and simultaneously performing waterproof construction;
j. and embedding the underpinned pile in the newly-built wall and/or column, or dismantling the underpinned pile after the newly-built wall and/or column is constructed, or reserving the underpinned pile after performing anticorrosive and antirust treatment.
Optionally, the proposed underground structure area comprises part or all of the space right below the existing building; or the proposed underground structure area comprises part or all of the space under the existing building and newly-increased underground space around the space under the existing building.
Optionally, for step b, the building enclosure is constructed on the ground outside the existing building or inside the existing building according to the relative position relationship between the proposed underground structure area and the existing building.
Optionally, for step c, when the existing building bottom plate structure or foundation affects underpinning pile construction, the existing building bottom plate structure or foundation is first holed, and then underpinning piles are constructed.
Optionally, for step i, the region to be built into the underground structure can also be constructed by using a reverse method, and when the construction is carried out by using the reverse method, the construction for bearing the upright piles of the newly-built outer wall needs to be carried out in advance.
Optionally, the underpinning pile is high strength helical blade steel-pipe pile, helical blade steel-pipe pile both is the auger stem body of construction pore-forming, and the bearing structure that vertical load was born in the later stage again simultaneously, helical blade steel-pipe pile adopts the small-size equipment construction, the small-size equipment can adapt to the headroom requirement of indoor construction.
Optionally, the helical blade steel pipe pile is formed by connecting a plurality of prefabricated rod bodies through screw threads, and after a front prefabricated rod body is placed in place, rotary power is provided through equipment to realize connection between the rear prefabricated rod body and the front prefabricated rod body; the length of the prefabricated rod body is manufactured according to design and construction requirements; the prefabricated rod body is divided into two specifications of a rod body with a helical blade and a smooth round rod body, the rod body with the helical blade is positioned at the lower part and used for cutting soil and providing frictional resistance, and the smooth round rod body is positioned at the upper part and plays a role in connection; the length proportion of the two specifications of rod bodies in the helical blade steel pipe pile is determined according to the upper structure load and the soil property condition.
Optionally, the inside of the spiral blade steel pipe pile body is of a hollow structure, high-pressure gas or high-pressure water can be input into the hollow structure in the drilling process to assist in soil discharge, and cemented curing materials are injected into the hollow structure area in the later stage, so that the rigidity and the bearing capacity of the pile body are improved.
Optionally, when the steel structure column is underpinned, welding the steel structure column and the helical blade steel pipe pile through a connecting steel plate; when the concrete column is underpinned, the concrete column is connected with the helical blade steel pipe pile by adopting a bar planting method, or when the concrete column is underpinned, steel wrapping treatment is firstly carried out on the periphery of the concrete column, and the concrete column after steel wrapping is welded with the helical blade steel pipe pile; when the underpinning pile is far away from the existing building structure wall and/or column, the underpinning pile is converted through the underpinning beam and connected with the underpinning beam.
Optionally, the underpinning pile is a cast-in-place pile, a static pressure pile, a steel pipe pile or a tree root pile.
Optionally, the underground structure formed by the storey-adding expansion can be used for underground automobile garages, underground bicycle garages, underground water storage tanks, underground granaries, underground storage spaces and tunnels.
The invention has the advantages and positive effects that: the method for building the additional floor under the existing building is provided, and the construction efficiency is high; small construction equipment is adopted in construction, so that construction can be carried out in a narrow space below a building; the underpinning pile is a high-strength helical blade steel pipe pile, the helical blade steel pipe pile is a helical drill rod body for pore forming during construction, and meanwhile, the supporting structure for bearing vertical load in the later period is adopted, so that the construction speed is high, and the influence on the environment is small.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a construction front view of a method for adding a floor and expanding under an existing building according to an embodiment of the present invention (the existing building has no basement structure, and a newly added underground structure area is equal to an existing building projection area);
fig. 2 is a construction front view of a method for adding a floor and expanding under an existing building according to an embodiment of the present invention (the existing building has no basement structure, and the newly added underground structure area is larger than the projection area of the existing building);
fig. 3 is a construction front view of a method for adding a floor and expanding under an existing building according to an embodiment of the present invention (the existing building has a basement structure, and the newly added underground structure area is smaller than the projection area of the existing building);
fig. 4 is a detailed construction diagram of a helical blade steel pipe pile in the method for storey-adding and extension under an existing building according to the embodiment of the invention;
fig. 5 is a detailed view of a prefabricated rod body (with a helical blade) in the method for building up a storey under an existing building according to the embodiment of the invention;
fig. 6 is a connection diagram of prefabricated rod bodies (connection between smooth round rod bodies) in an existing building lower storey-adding expansion method according to an embodiment of the invention;
fig. 7 is a connection diagram of a prefabricated rod body (a light round rod body is connected with a rod body with a helical blade) in an existing building lower storey-adding expansion method according to an embodiment of the invention.
In the figure: 1. existing buildings; 2. drawing up an underground structural region; 3. an enclosure structure; 4. existing building structure walls and/or columns; 5. underpinning the pile; 6. a connecting member; 7. original foundation; 8. a buckling restrained structure; 9. drawing up a bottom plate of an underground structure; 10. a basement structure; 11. a helical blade steel pipe pile; 12. prefabricating a rod body; 13. a rod body with a helical blade; 14. the light round rod body.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 to 7, a method for building a floor under an existing building, is characterized by comprising the following steps:
1. a method for building a storey under an existing building is characterized by comprising the following steps:
a. detecting and evaluating the existing building (1), and reinforcing a weak structural member;
b. marking a proposed underground structure area (2) below an existing building (1), constructing a circle of building enclosure (3) outside the proposed underground structure area (2), wherein the building enclosure (3) is a supporting pile or a supporting wall and is used for resisting lateral soil water pressure during construction of the proposed underground structure area (2), and simultaneously adding a water-stop curtain when the underground water level is higher than the bottom height of the proposed underground structure area (2);
c. marking a proposed underground structure area (2) and the structural walls and/or columns (4) of the existing buildings (1) at the periphery of the proposed underground structure area, constructing underpinning piles (5) around the marked structural walls and/or columns (4) of the existing buildings (1), wherein the underpinning piles (5) are uniformly and symmetrically arranged, and the number and the length of the underpinning piles (5) are determined by the upper structure load and the soil property condition;
d. when the existing building (1) is covered with soil on the foundation, excavating soil of the proposed underground structure area (2) to the top surface of the existing building (1) foundation;
e. connecting the structural wall and/or the column (4) of the existing building (1) with the underpinning pile (5) through a connecting member (6), so that the load of the existing building (1) is transmitted to the underpinning pile (5) through the structural wall and/or the column (4) of the existing building (1) and further transmitted to a deep holding soil layer;
f. breaking an original foundation (7) below a structural wall and/or a column (4) of an existing building (1);
g. clearing earthwork of the proposed underground structure area (2) to the bottom elevation of the proposed underground structure bottom plate, and arranging a buckling-restrained structure (8) on the exposed part of the underpinning pile (5) in the earthwork clearing process;
h. when the depth of the planned underground structure area (2) is larger, a lateral reinforcing structure is arranged on the building enclosure (3) layer by layer along with the removal of earthwork;
i. sequentially constructing a bottom plate (9), an outer wall and an inner wall of the structure, a structural column and a floor slab for constructing and drawing up an underground structure from bottom to top, and simultaneously performing waterproof construction;
j. the underpinning pile (5) is buried in the newly-built wall and/or column (4), or the underpinning pile (5) is dismantled after the newly-built wall and/or column (4) is constructed, or the underpinning pile (5) is preserved after being subjected to anticorrosive and antirust treatment.
As an alternative embodiment, the proposed underground structure area (2) comprises part or all of the space right below the existing building (1); or the proposed underground structure area (2) comprises part or all of the space right below the existing building (1) and newly-increased underground space around the position right below the existing building (1).
As an alternative embodiment, for the step b, the building enclosure (3) is constructed on the ground outside the existing building or inside the existing building according to the relative position relationship between the proposed underground structure area (2) and the existing building (1) and whether the existing building (1) has the basement structure (10).
As an alternative embodiment, for the step c, when the underpinning pile (5) construction is influenced by the bottom plate (9) structure or foundation (7) of the existing building (1), the hole opening treatment is firstly carried out on the bottom plate (9) structure or foundation (7) of the existing building (1), and then the underpinning pile (5) is constructed.
As an alternative embodiment, for step i, the underground structural region (2) to be built can also be constructed by using a reverse method, and when the construction by using the reverse method is adopted, the construction for bearing the upright piles of the newly-built outer wall needs to be carried out in advance.
As an optional embodiment, underpin stake (5) are high strength helical blade steel-pipe pile (11), helical blade steel-pipe pile (11) both are the auger stem body of construction pore-forming, are the bearing structure that vertical load was born in the later stage again simultaneously, helical blade steel-pipe pile (11) adopt the small-size equipment construction, the small-size equipment can adapt to the headroom requirement of indoor construction.
As an optional embodiment, the helical blade steel pipe pile (11) is formed by connecting a plurality of prefabricated rod bodies (12) through screw threads, and after a previous prefabricated rod body (12) is placed in place, rotary power is provided through equipment to realize the connection between the next prefabricated rod body (12) and the previous prefabricated rod body (12); the length of the prefabricated rod body (12) is manufactured according to design and construction requirements; the prefabricated rod body (12) is divided into two specifications, namely a rod body (13) with a helical blade and a smooth round rod body (14), the rod body (13) with the helical blade is positioned at the lower part and used for cutting soil and providing frictional resistance, and the smooth round rod body (14) is positioned at the upper part and plays a role in connection; the length proportion of the two rod bodies of the helical blade steel pipe pile (11) is determined according to the upper structure load and the soil property condition.
As an optional embodiment, the interior of the body of the helical blade steel pipe pile (11) is of a hollow structure, high-pressure gas or high-pressure water can be input into the hollow structure in the drilling process to assist in soil removal, and cemented and solidified materials are injected into the hollow structure area in the later period, so that the rigidity and the bearing capacity of the pile body are improved.
As an optional embodiment, when the steel structure column is underpinned, the steel structure column is welded with the helical blade steel pipe pile (11) through a connecting steel plate; when the concrete column is underpinned, the concrete column is connected with the helical blade steel pipe pile (11) by adopting a bar planting method, or when the concrete column is underpinned, steel wrapping treatment is firstly carried out on the periphery of the concrete column, and the steel-wrapped concrete column is welded with the helical blade steel pipe pile (11); when the underpinning pile (5) is far away from the structural wall and/or the column (4) of the existing building (1), the underpinning pile (5) is connected with the underpinning beam through the conversion of the underpinning beam.
As an optional embodiment, the underpinning pile (5) is a cast-in-place pile, a static pressure pile, a steel pipe pile or a tree root pile.
As an optional embodiment, the underground structure formed by the storey-adding expansion can be used for an underground automobile garage, an underground bicycle garage, an underground water storage tank, an underground granary, an underground storage space and a tunnel.
For the single helical blade steel pipe pile (11), the main steps of construction are ① drilling machine in place, ② erection drilling machine, ③ steel pipe pile in place, ④ drilling, ⑤ grouting, ⑥ pile node connection, ⑦ anti-buckling system, ⑧ excavation, ⑨ newly-added underground space concrete pouring and ⑩ pile connection removal.
Claims (10)
1. A method for building a storey under an existing building is characterized by comprising the following steps:
a. detecting and evaluating the existing building, and reinforcing a weak structural member;
b. marking a proposed underground structure area below an existing building, constructing a circle of enclosure structure outside the proposed underground structure area, wherein the enclosure structure is a support pile or a support wall and is used for resisting lateral soil water pressure during construction of the proposed underground structure area, and simultaneously adding a water-stop curtain when the groundwater level is higher than the bottom height of the proposed underground structure area;
c. marking the planned underground structure area and the existing building structure walls and/or columns around the planned underground structure area, constructing underpinning piles around the marked existing building structure walls and/or columns, wherein the underpinning piles are uniformly and symmetrically arranged, and the number and the length of the underpinning piles are determined by the upper structure load and the soil texture condition;
d. when the existing building foundation is covered with soil, excavating soil of a proposed underground structure area to the top surface of the existing building foundation;
e. connecting the existing building structure wall and/or column with the underpinning pile through a connecting member, so that the load of the existing building is transmitted to the underpinning pile through the existing building structure wall and/or column, and then transmitted to the deep bearing soil layer;
f. breaking the original foundation below the existing building structure wall and/or column;
g. clearing earthwork of the proposed underground structure area to the bottom elevation of the proposed underground structure bottom plate, and arranging a buckling-restrained structure on the exposed part of the underpinning pile in the earthwork clearing process;
h. when the depth of the planned underground structure area is larger, a lateral reinforcing structure is arranged on the building envelope in a layered mode along with the removal of earthwork;
i. sequentially constructing a bottom plate, a structural outer wall, an inner wall, a structural column and a floor slab for planning an underground structure from bottom to top, and simultaneously performing waterproof construction;
j. and embedding the underpinned pile in the newly-built wall and/or column, or dismantling the underpinned pile after the newly-built wall and/or column is constructed, or reserving the underpinned pile after performing anticorrosive and antirust treatment.
2. The method for building a floor under an existing building according to claim 1, wherein the proposed underground structure area comprises part or all of the space directly under the existing building; or the proposed underground structure area comprises part or all of the space under the existing building and newly-increased underground space around the space under the existing building.
3. The method of claim 1, wherein for step b, the building envelope is constructed on the ground outside the existing building or inside the existing building according to the relative position of the proposed underground structure area and the existing building.
4. The method for increasing the storey of the existing building according to claim 1, wherein for the step c, when the existing building bottom plate structure or foundation affects the underpinning pile construction, the existing building bottom plate structure or foundation is subjected to a hole making treatment, and then the underpinning pile is constructed.
5. The method for increasing the floor of the existing building according to claim 1, wherein for step i, the region to be built underground can be constructed by reverse method, and when the reverse method is adopted, the construction of the upright piles for supporting the newly-built outer wall is carried out in advance.
6. The method of claim 1, wherein the underpinning pile is a high-strength helical-blade steel pipe pile, the helical-blade steel pipe pile is a helical drill pipe body for hole formation during construction and is a supporting structure for bearing vertical load in a later period, the helical-blade steel pipe pile is constructed by small equipment, and the small equipment can meet the requirement of clearance in indoor construction.
7. The method for increasing the floor and expanding the existing building according to claim 1, wherein the helical blade steel pipe pile is formed by connecting a plurality of prefabricated rod bodies through screw threads, and after a previous prefabricated rod body is placed in place, the connection between the next prefabricated rod body and the previous prefabricated rod body is realized by providing rotary power through equipment; the length of the prefabricated rod body is manufactured according to design and construction requirements; the prefabricated rod body is divided into two specifications of a rod body with a helical blade and a smooth round rod body, the rod body with the helical blade is positioned at the lower part and used for cutting soil and providing frictional resistance, and the smooth round rod body is positioned at the upper part and plays a role in connection; the length proportion of the two specifications of rod bodies in the helical blade steel pipe pile is determined according to the upper structure load and the soil property condition.
8. The method for increasing the floor and expanding the existing building according to claim 1, wherein the spiral blade steel pipe pile body is of a hollow structure, high-pressure gas or high-pressure water can be input into the hollow structure during drilling to assist soil removal, and cemented curing materials are injected into the hollow structure area at a later stage to increase the rigidity and the bearing capacity of the pile body.
9. The method for the storey-adding and extension under the existing building according to claim 1, wherein when the steel structure column is underpinned, the steel structure column and the helical blade steel pipe pile are welded through a connecting steel plate; when the concrete column is underpinned, the concrete column is connected with the helical blade steel pipe pile by adopting a bar planting method, or when the concrete column is underpinned, steel wrapping treatment is firstly carried out on the periphery of the concrete column, and the concrete column after steel wrapping is welded with the helical blade steel pipe pile; when the underpinning pile is far away from the existing building structure wall and/or column, the underpinning pile is converted through the underpinning beam and connected with the underpinning beam.
10. The method for storey-adding and expansion under the existing building according to claim 1, wherein the underpinning pile is a cast-in-place pile, a static pressure pile, a steel pipe pile, a tree root pile; the underground structure formed by the storey-adding expansion can be used for underground automobile garages, underground bicycle garages, underground water storage tanks, underground granaries, underground storage spaces and tunnels.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111877541A (en) * | 2020-08-10 | 2020-11-03 | 青岛智汇港创新科技有限公司 | Building flood disaster loss reduction system and application method thereof |
| CN112502464A (en) * | 2020-11-23 | 2021-03-16 | 上海建工二建集团有限公司 | Reverse construction method for extension basement under existing building |
| CN112576056A (en) * | 2020-12-07 | 2021-03-30 | 北京中岩大地科技股份有限公司 | Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof |
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| CN112576056A (en) * | 2020-12-07 | 2021-03-30 | 北京中岩大地科技股份有限公司 | Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof |
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