CN112593584A - Existing building foundation pile extension reinforcing structure and construction method thereof - Google Patents
Existing building foundation pile extension reinforcing structure and construction method thereof Download PDFInfo
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- CN112593584A CN112593584A CN202011461412.7A CN202011461412A CN112593584A CN 112593584 A CN112593584 A CN 112593584A CN 202011461412 A CN202011461412 A CN 202011461412A CN 112593584 A CN112593584 A CN 112593584A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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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
- E02D27/16—Foundations formed of separate piles
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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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Abstract
The utility model provides an existing building foundation pile extension reinforced structure and construction method thereof, includes existing foundation pile (1), its characterized in that: the novel expansion pile is characterized in that three or more than three expansion piles (3) are symmetrically and vertically arranged in an annular shape in the soil body (2) on the periphery of the existing foundation pile (1), a pair of semicircular pile sleeves (5) are arranged on the outer surface of the existing foundation pile (1), the semicircular pile sleeves (5) are fixedly connected through fastening bolts (6), a pile body connecting seat (4) is fixed on each semicircular pile sleeve (5), an expansion pile sliding sleeve (7) is fixedly arranged on the outer side of each pile body connecting seat (4), and one expansion pile (3) is sleeved in each expansion pile sliding sleeve (7).
Description
Technical Field
The invention relates to a foundation pile extension reinforcing structure and a construction method thereof, in particular to an existing building foundation pile extension reinforcing structure and a construction method thereof, and belongs to the technical field of building foundation engineering.
Background
Along with the development of urban modernization, the contradiction and the problem of urban land resource and space development are increasingly prominent, the utilization of underground space is continuously three-dimensionally changed, and the value of underground space is increasingly prominent. Many existing buildings have no basement or limited height space in basements, such as: the underground basement or the underground garage is excavated in the underground of the existing building, the height of the underground space is increased in the original space with a shallow underground foundation, and the expansion of the underground space is a necessary trend of the development of cities and building technologies. In addition, in earthquake-prone areas, the foundation piles of the existing buildings are reinforced and very necessary engineering, however, the expansion of the foundation piles of the existing buildings in the depth direction is always a technical problem, the connection and stress fusion of new and old pile foundations in the process of expansion and reinforcement has a technical bottleneck, the expansion difficulty is high, the connection reliability and safety performance between the foundation piles and newly-arranged piles cannot be well solved, and the technical problem cannot be well solved in the prior art.
Disclosure of Invention
The invention aims to overcome the defects and defects that the traditional mode has high reinforcing difficulty on foundation piles of the existing building, and the foundation piles and the newly-arranged piles cannot be effectively jointed and stressed and fused in the expanding and reinforcing process, so that the connection reliability and the safety performance are poor, and the overall stability is low.
The second purpose of the invention is to provide a construction method for expanding and reinforcing the existing building foundation pile, which has the advantages of reasonable process, convenient construction, effective connection and stress fusion between the foundation pile and the newly-arranged pile, capability of meeting the requirement of basement depth expansion or building foundation reinforcement and improved overall stability, and aims to overcome the defects that the existing building foundation pile has higher expansion difficulty in the depth direction, is very difficult to construct by adopting the traditional construction method, can have limited expansion in the depth direction and cannot solve the problem of effective connection and stress fusion between the foundation pile and the newly-arranged pile.
In order to achieve the first object, the technical solution of the present invention is: the utility model provides an existing building foundation pile extension reinforced structure, includes existing foundation pile, the lower extreme setting of existing foundation pile is in the soil body, its characterized in that: the utility model discloses a pile extension device, including the extension stake of existing foundation pile, be provided with three or three above extension stakes perpendicularly in the peripheral soil body of existing foundation pile, the axial lead of existing foundation pile parallels with the axial lead of extension stake, the surface mounting of existing foundation pile has a pair of semi-circular pile cover, it is fixed to connect through fastening bolt between the semi-circular pile cover, be fixed with the stake body connecting seat on the semi-circular pile cover, the fixed extension stake sliding sleeve that is provided with in the outside of stake body connecting seat, every extension stake sliding sleeve endotheca has an extension stake, along radial direction from having seted up a plurality of horizontal fixed orificess on the extension stake, the installation is fixed with the clamp bracket on the extension stake, install hydraulic pressure jacking device.
Further, install interim slide rail through horizontal fixed orifices on the upper portion outer wall of existing foundation pile, interim slide rail is multistage formula mosaic structure, and interim slide rail distributes along the outer wall vertical distribution of existing foundation pile to a plurality of track gyro wheels are evenly installed in the outside of interim slide rail.
Further, the hoop bracket is installed to the outer circumference of extension stake and the lower extreme that is located the pile body connecting seat, and the lower extreme of pile body connecting seat or the lower extreme of hoop bracket are provided with horizontal setting element, and horizontal setting element installs in the horizontal fixed orifices between two adjacent extension stakes.
Furthermore, the lower extreme of pile body connecting seat or the below fixed stay of clamp bracket have vertical support post, and vertical support post's upper end is fixed mutually with pile body connecting seat or clamp bracket, and vertical support post's lower extreme is fixed in the soil body or is supported on the lateral wall of adjacent existing foundation pile.
Furthermore, an anchoring hole is formed in the outer wall of the semicircular pile sleeve, an anchoring piece or an anchoring rod penetrating through the existing foundation pile penetrates into the anchoring hole, and the arc radius of the semicircular pile sleeve is smaller than or equal to the outer diameter of the existing foundation pile.
Furthermore, an inner wall groove is formed in the inner side wall of the sliding hole of the expansion pile, the inner wall groove is matched with the temporary sliding rail and the rail roller wheel, and the rail roller wheel is in contact with the bottom of the inner wall groove.
In order to achieve the second object, the technical solution of the present invention is: a construction method for expanding and reinforcing foundation piles of an existing building is characterized by comprising the following steps:
a. firstly, excavating soil layers around the upper part and the middle part of the existing foundation pile, and expanding an underground space under the condition of ensuring the stability of the existing foundation pile;
b. then vertically drilling holes in the soil body on the periphery of each existing foundation pile and pressing extension piles into the holes, so that three or more than three extension piles are symmetrically distributed in the soil body on the periphery of the existing foundation pile in an annular shape, the pile bottom depth of each extension pile is greater than that of the existing foundation pile, and the upper end parts of the extension piles are exposed;
c. then, a plurality of horizontal fixing holes are formed in the outer wall of the upper part of the existing foundation pile, and temporary slide rails are installed through the horizontal fixing holes;
d. then installing a pile body connecting device, fixing two symmetrically arranged semicircular pile sleeves on the outer circumference of the middle lower part of the existing foundation pile through fastening bolts, and respectively sleeving expansion pile sliding sleeves on the circumference of the upper end of an expansion pile so that a temporary slide rail and a track roller are positioned in an inner wall groove, and connecting and fixing the semicircular pile sleeves and the expansion pile sliding sleeves into a whole through a pile body connecting seat;
e. after the pile body is connected, a hoop bracket is arranged on the outer circumference of the expansion pile, a hydraulic jacking device is arranged between the hoop bracket and the pile body connecting seat, and the hydraulic jacking device is started to jack for a certain height for pre-tightening, so that stress association is established between the existing foundation pile and the expansion pile;
f. then installing a transverse positioning piece or a vertical supporting column which plays a supporting role, wherein the transverse positioning piece is arranged at the lower end of the pile body connecting seat or the lower end of the hoop bracket, or the vertical supporting column is fixedly supported at the lower end of the pile body connecting seat or the lower part of the hoop bracket, and the lower end of the vertical supporting column is fixed in soil or supported on the outer side wall of an adjacent existing foundation pile;
g. and finally, starting the hydraulic jacking device to shrink, and then removing the hydraulic jacking device to complete the expansion and reinforcement construction of the foundation pile.
The invention has the beneficial effects that:
1. according to the invention, the plurality of extension piles are annularly and symmetrically and vertically arranged in the soil body on the periphery of the existing foundation pile, so that the existing foundation pile can be well protected from the periphery, the instability of the existing foundation pile in the soil layer excavating process is prevented, and the damage of the existing foundation pile due to lateral shearing force is avoided.
2. The invention adopts the pile body connecting device, establishes stress correlation between the existing foundation pile and the expansion pile by a jacking and pre-tightening mode, and simultaneously adopts various anchoring connection modes to ensure stable connection between the existing foundation pile, the expansion pile and the pile body connecting device, so that the existing foundation pile, the expansion pile and the pile body connecting device form a whole.
3. The pile extension device is reasonable in structure, the extension pile is installed on the temporary slide rail in a sliding sleeve mode, the plurality of rail rollers are evenly installed on the outer side of the temporary slide rail, friction during jacking movement can be reduced, installation accuracy is improved, meanwhile, accurate connection and pre-tightening stress are guaranteed through the hydraulic jacking device and the temporary slide rail, effective connection and stress fusion can be conducted between the foundation pile and a newly-installed pile in the extension reinforcing process, connection reliability and safety performance are improved, and overall stability is improved.
Drawings
Fig. 1 is a schematic view showing the positions of existing foundation piles and extension piles according to the present invention.
Fig. 2 is a schematic structural view of the existing foundation pile and the expansion pile connected by the pile body connecting device.
Fig. 3 is a schematic structural diagram of the temporary slide rail of the present invention.
Fig. 4 is a schematic structural diagram of the pile connecting device of the invention.
Fig. 5 is a schematic structural diagram of the first embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: the pile comprises an existing foundation pile 1, a soil body 2, an expansion pile 3, a pile body connecting seat 4, a semicircular pile sleeve 5, a fastening bolt 6, an expansion pile sliding sleeve 7, an inner wall groove 8, a temporary sliding rail 9, a rail roller 10, a hydraulic jacking device 11, a hoop bracket 12, a horizontal fixing hole 13, an anchoring hole 14, a transverse positioning piece 15 and a vertical supporting column 16.
Detailed Description
The invention is described in further detail below with reference to the following description of the drawings and the detailed description.
Referring to fig. 1 to 6, the existing building foundation pile extension reinforcement structure of the present invention includes an existing foundation pile 1, a lower end of the existing foundation pile 1 is disposed in a soil body 2, and is characterized in that: the utility model discloses a pile extension device, it is characterized in that it is provided with three or more than three extension piles 3 perpendicularly to be annular symmetry in the peripheral soil body 2 of existing foundation pile 1, the axial lead of existing foundation pile 1 parallels with the axial lead of extension pile 3, the surface mounting of existing foundation pile 1 has a pair of semi-circular pile cover 5, connect fixedly through fastening bolt 6 between the semi-circular pile cover 5, be fixed with pile body connecting seat 4 on the semi-circular pile cover 5, the outside of pile body connecting seat 4 is fixed with extension pile sliding sleeve 7, every extension pile sliding sleeve 7 endotheca has an extension pile 3, along radial direction from having seted up a plurality of horizontal fixed orificess 13 on the extension pile 3, installation is fixed with clamp bracket 12 on the extension pile 3, install hydraulic pressure jacking device 11 between clamp bracket 12 and the pile body connecting seat 4.
Install interim slide rail 9 through horizontal fixed orifices 13 on the upper portion outer wall of existing foundation pile 1, interim slide rail 9 is multistage formula mosaic structure, and interim slide rail 9 distributes along the outer wall of existing foundation pile 1 is perpendicular to a plurality of track gyro wheels 10 are evenly installed in the outside of interim slide rail 9.
The hoop bracket 12 is installed on the outer circumference of the extension pile 3 and at the lower end of the pile body connecting seat 4, the transverse positioning piece 15 is arranged at the lower end of the pile body connecting seat 4 or at the lower end of the hoop bracket 12, and the transverse positioning piece 15 is installed in the horizontal fixing hole 13 between two adjacent extension piles 3.
The lower end of the pile body connecting seat 4 or the lower part of the hoop bracket 12 is fixedly supported with a vertical supporting column 16, the upper end of the vertical supporting column 16 is fixed with the pile body connecting seat 4 or the hoop bracket 12, and the lower end of the vertical supporting column 16 is fixed in a soil body 2 or supported on the outer side wall of the adjacent existing foundation pile 1.
The outer wall of the semicircular pile sleeve 5 is provided with an anchoring hole 14, an anchoring piece or an anchoring rod penetrating through the existing foundation pile 1 penetrates into the anchoring hole 14, and the arc radius of the semicircular pile sleeve 5 is smaller than or equal to the outer diameter of the existing foundation pile 1.
An inner wall groove 8 is formed in the inner side wall of the expansion pile sliding hole 7, the inner wall groove 8 is matched with the temporary sliding rail 9 and the rail roller 10, and the rail roller 10 is in contact with the bottom of the inner wall groove 8.
A construction method for expanding and reinforcing foundation piles of an existing building is characterized by comprising the following steps:
a. firstly, excavating soil layers around the upper part and the middle part of the existing foundation pile 1, and expanding an underground space under the condition of ensuring the stability of the existing foundation pile 1;
b. then vertically drilling holes in the soil body 2 at the periphery of each existing foundation pile 1 and pressing extension piles 3 into the soil body 2, so that three or more extension piles 3 are symmetrically distributed in the soil body 2 at the periphery of the existing foundation pile 1 in an annular shape, the pile bottom depth of each extension pile 3 is greater than that of the existing foundation pile 1, and the upper end parts of the extension piles 3 are exposed;
c. then, a plurality of horizontal fixing holes 13 are formed in the outer wall of the upper part of the existing foundation pile 1, and temporary slide rails 9 are installed through the horizontal fixing holes 13;
d. then installing a pile body connecting device, fixing two symmetrically arranged semicircular pile sleeves 5 on the outer circumference of the middle lower part of the existing foundation pile 1 through fastening bolts 6, and respectively sleeving expansion pile sliding sleeves 7 on the circumference of the upper end of an expansion pile 3, so that a temporary slide rail 9 and a rail roller 10 are positioned in an inner wall groove 8, and connecting and fixing the semicircular pile sleeves 5 and the expansion pile sliding sleeves 7 into a whole through a pile body connecting seat 4;
e. after the pile body connection is completed, installing a hoop bracket 12 on the outer circumference of the expansion pile 3, installing a hydraulic jacking device 11 between the hoop bracket 12 and the pile body connecting seat 4, starting the hydraulic jacking device 11 to jack for a certain height for pre-tightening, and establishing stress association between the existing foundation pile 1 and the expansion pile 3;
f. then installing a transverse positioning piece 15 or a vertical supporting column 16 which plays a supporting role, wherein the transverse positioning piece 15 is arranged at the lower end of the pile body connecting seat 4 or the lower end of the clamp bracket 12, or the vertical supporting column 16 is fixedly supported at the lower end of the pile body connecting seat 4 or the lower part of the clamp bracket 12, and the lower end of the vertical supporting column 16 is fixed in the soil body 2 or supported on the outer side wall of the adjacent existing foundation pile 1;
g. and finally, starting the hydraulic jacking device 11 to shrink, and then detaching the hydraulic jacking device 11 to complete the expansion and reinforcement construction of the foundation pile.
Referring to fig. 1, the lower end of an existing foundation pile 1 is arranged in a soil body 2, the existing building has no basement or the height space of the basement is limited, and the invention adopts an extension pile 3 and a pile body connecting device to extend and reinforce the foundation pile. Three or more than three expansion piles 3 are symmetrically and vertically arranged in an annular shape in the soil body 2 at the periphery of the existing foundation pile 1, the axial lead of the existing foundation pile 1 is parallel to the axial lead of the expansion pile 3, and generally three or four expansion piles 3 are arranged according to the stress condition and the bearing condition of the existing foundation pile 1. The pile bottom depth of the expansion pile 3 is larger than that of the existing foundation pile 1, and the upper end part of the expansion pile 3 needs to be exposed. The expansion pile 3 adopting the distributed structure is not only uniformly stressed, but also can well protect the existing foundation pile 1 from the periphery when the basement soil layer is excavated and the space is expanded, so that the instability of the existing foundation pile 1 in the soil layer excavation process is prevented, and the damage of the existing foundation pile 1 caused by lateral shearing force is avoided.
The invention connects and fixes the existing foundation pile 1 and the expansion piles 3 distributed around through the pile body connecting device, the pile body connecting device comprises a pile body connecting seat 4, semicircular pile sleeves 5, fastening bolts 6 and expansion pile sliding sleeves 7, a pair of semicircular pile sleeves 5 are arranged on the outer surface of the existing foundation pile 1, the semicircular pile sleeves 5 are connected and fixed through the fastening bolts 6, the installation is very convenient, the two semicircular pile sleeves 5 are combined to form an integral structure, and the fixation of the existing foundation pile 1 is realized. The semicircular pile sleeve 5 is fixedly provided with a pile body connecting seat 4, the outer side of the pile body connecting seat 4 is fixedly provided with an extension pile sliding sleeve 7, each extension pile sliding sleeve 7 is internally sleeved with an extension pile 3, and an integrated structure or a bolt fixing mode or a welding fixing mode can be adopted between the pile body connecting seat 4 and the extension pile sliding sleeve 7. Because the upper end of the existing foundation pile 1 is in a supporting and stress state for a building, when the soil layer is not completely cleared and hollowed, the lower end of the existing foundation pile 1 is not convenient to be sleeved into the annular pile sleeve from the end part, the spliced semicircular pile sleeve 5 can be only adopted for installation and fixation, and the upper end of the extension pile 3 is positioned above the soil layer, so that the extension pile sliding sleeve 7 can be sleeved into the upper end of the extension pile 3. In order to improve the firmness of fixation, the outer wall of the semicircular pile sleeve 5 is provided with an anchoring hole 14, and an anchoring part or an anchoring rod penetrating through the existing foundation pile 1 penetrates into the anchoring hole 14.
In order to facilitate the expansion pile sliding sleeve 7 to accurately lift and slide on the expansion pile 3, the invention adopts a sliding track structure, an inner wall groove 8 is arranged on the inner side wall of an expansion pile sliding hole 7, a temporary sliding rail 9 distributed along the vertical sliding direction is arranged on the outer wall of the upper part of the existing foundation pile 1, the temporary sliding rail 9 is of a multi-section splicing structure, the temporary sliding rail 9 is vertically distributed along the outer wall of the existing foundation pile 1, a plurality of track rollers 10 are uniformly arranged on the outer side of the temporary sliding rail 9, the inner wall groove 8 is matched with the temporary sliding rail 9 and the track rollers 10, and the track rollers 10 are contacted with the bottom of the inner wall groove 8. In addition, a plurality of horizontal fixing holes 13 are formed in the extending pile 3 along the radial direction, the horizontal fixing holes 13 can be used as mounting holes when the temporary sliding rail 9 is used, mounting and fixing are facilitated, and after the temporary sliding rail 9 is jacked up and removed, the horizontal fixing holes 13 can be used as mounting and fixing holes of the transverse positioning piece 15 or the vertical supporting column 16.
The hoop bracket 12 is installed on the outer circumference of the expansion pile 3 and located at the lower end of the pile body connecting seat 4, two or more than two hydraulic jacking devices 11 which are symmetrically distributed are installed between the hoop bracket 12 and the pile body connecting seat 4, and the hydraulic jacking devices 11 are of hydraulic cylinder structures. After jacking and pre-tightening are carried out through the hydraulic jacking device 11, the pile body connecting device is permanently fixed by adopting the transverse positioning piece 15 or the vertical supporting column 16, and position adjustment and replacement can be carried out when necessary. If the transverse positioning piece 15 is adopted, the transverse positioning piece 15 is arranged at the lower end of the pile body connecting seat 4 or the lower end of the hoop bracket 12, the transverse positioning piece 15 is arranged in the horizontal fixing hole 13 between two adjacent expansion piles 3, and the transverse positioning piece 15 can be a fixing steel bar or a fixing support frame. If adopt vertical support post 16, the lower extreme of pile body connecting seat 4 or the below fixed support of clamp bracket 12 have vertical support post 16, and vertical support post 16's upper end is fixed mutually with pile body connecting seat 4 or clamp bracket 12, and vertical support post 16's lower extreme is fixed in soil body 2 or is supported on the lateral wall of adjacent existing foundation pile 1, has reached fine support fixed effect.
The invention relates to a construction method for expanding and reinforcing an existing building foundation pile, which comprises the following steps: firstly, soil layers around the upper part and the middle part of the existing foundation pile 1 are excavated, and the underground space is enlarged under the condition that the stability of the existing foundation pile 1 is ensured. And then vertically drilling holes in the soil body 2 at the periphery of each existing foundation pile 1 and pressing the expansion piles 3 into the soil body 2 at the periphery of the existing foundation pile 1, so that three or more than three expansion piles 3 are symmetrically distributed in the soil body 2 at the periphery of the existing foundation pile 1 in an annular shape, the pile bottom depth of each expansion pile 3 is greater than that of the existing foundation pile 1, and the upper end parts of the expansion piles 3 are exposed. Then, a plurality of horizontal fixing holes 13 are formed in the outer wall of the upper part of the existing foundation pile 1, and the temporary slide rails 9 are installed through the horizontal fixing holes 13. And then, installing a pile body connecting device, fixing two semicircular pile sleeves 5 which are symmetrically arranged on the outer circumference of the middle lower part of the existing foundation pile 1 through fastening bolts 6, and simultaneously respectively sleeving expansion pile sliding sleeves 7 on the circumference of the upper end of an expansion pile 3, so that a temporary slide rail 9 and a rail roller 10 are positioned in an inner wall groove 8, and connecting and fixing the semicircular pile sleeves 5 and the expansion pile sliding sleeves 7 into a whole through a pile body connecting seat 4. After the pile body connection is completed, a hoop bracket 12 is installed on the outer circumference of the expansion pile 3, a hydraulic jacking device 11 is installed between the hoop bracket 12 and the pile body connecting seat 4, the hydraulic jacking device 11 is started to jack for a certain height for pre-tightening, so that stress association is established between the existing foundation pile 1 and the expansion pile 3, and the temporary sliding rail 9 is detached. Then, a horizontal positioning piece 15 or a vertical supporting column 16 for supporting is installed, the horizontal positioning piece 15 is arranged at the lower end of the pile connecting seat 4 or the lower end of the hoop bracket 12, or the vertical supporting column 16 is fixedly supported at the lower end of the pile connecting seat 4 or the lower end of the hoop bracket 12, and the lower end of the vertical supporting column 16 is fixed in the soil body 2 or supported on the outer side wall of the adjacent existing foundation pile 1. And finally, starting the hydraulic jacking device 11 to shrink, detaching the hydraulic jacking device 11 to complete the expansion and reinforcement construction of the foundation pile, and further excavating and expanding the underground space after the expansion and reinforcement of the foundation pile is completed.
While the invention has been described in detail with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit of the invention.
Claims (7)
1. The utility model provides an existing building foundation pile extension reinforced structure, includes existing foundation pile (1), the lower extreme setting of existing foundation pile (1) is in soil body (2), its characterized in that: the novel foundation pile is characterized in that three or more than three expansion piles (3) are symmetrically and annularly arranged in an existing foundation pile (1) peripheral soil body (2) perpendicularly, the axial lead of the existing foundation pile (1) is parallel to the axial lead of the expansion pile (3), a pair of semicircular pile sleeves (5) are installed on the outer surface of the existing foundation pile (1), the semicircular pile sleeves (5) are fixedly connected through fastening bolts (6), a pile body connecting seat (4) is fixed on each semicircular pile sleeve (5), an expansion pile sliding sleeve (7) is fixedly arranged on the outer side of each pile body connecting seat (4), one expansion pile (3) is sleeved in each expansion pile sliding sleeve (7), a plurality of horizontal fixing holes (13) are formed in each expansion pile (3) along the radial direction, a clamp bracket (12) is fixedly installed on each expansion pile (3), and a hydraulic jacking device (11) is installed between each clamp bracket (12) and each pile body connecting seat (4).
2. An existing building foundation pile extension reinforcement structure as set forth in claim 1, wherein: install interim slide rail (9) through horizontal fixed orifices (13) on the upper portion outer wall of existing foundation pile (1), interim slide rail (9) are multistage formula mosaic structure, and interim slide rail (9) are along the outer wall vertical distribution of existing foundation pile (1) to a plurality of track gyro wheels (10) are evenly installed in the outside of interim slide rail (9).
3. An existing building foundation pile extension reinforcement structure as set forth in claim 1, wherein: the expansion pile is characterized in that a hoop bracket (12) is installed on the outer circumference of each expansion pile (3) and located at the lower end of each pile body connecting seat (4), a transverse positioning piece (15) is arranged at the lower end of each pile body connecting seat (4) or at the lower end of each hoop bracket (12), and each transverse positioning piece (15) is installed in a horizontal fixing hole (13) between every two adjacent expansion piles (3).
4. An existing building foundation pile extension reinforcement structure as set forth in claim 1, wherein: the lower extreme of pile body connecting seat (4) or the below fixed stay of clamp bracket (12) have vertical support post (16), and the upper end and pile body connecting seat (4) or clamp bracket (12) of vertical support post (16) are fixed mutually, and the lower extreme of vertical support post (16) is fixed in soil body (2) or is supported on the lateral wall of adjacent existing foundation pile (1).
5. An existing building foundation pile extension reinforcement structure as set forth in claim 1, wherein: the anchor pile is characterized in that an anchor hole (14) is formed in the outer wall of the semicircular pile sleeve (5), an anchor part or an anchor rod penetrating through the existing foundation pile (1) penetrates into the anchor hole (14), and the arc radius of the semicircular pile sleeve (5) is smaller than or equal to the outer diameter of the existing foundation pile (1).
6. An existing building foundation pile extension reinforcement structure as set forth in claim 1, wherein: an inner wall groove (8) is formed in the inner side wall of the expansion pile sliding hole (7), the inner wall groove (8) is matched with the temporary sliding rail (9) and the rail roller (10), and the rail roller (10) is in contact with the bottom of the inner wall groove (8).
7. A construction method for expanding and reinforcing foundation piles of an existing building is characterized by comprising the following steps:
a. firstly, excavating soil layers around the upper part and the middle part of the existing foundation pile (1), and expanding an underground space under the condition of ensuring the stability of the existing foundation pile (1);
b. then vertically drilling holes in the soil body (2) on the periphery of each existing foundation pile (1) and pressing extension piles (3) into the holes, so that three or more extension piles (3) are symmetrically distributed in the soil body (2) on the periphery of the existing foundation pile (1) in an annular shape, the pile bottom depth of each extension pile (3) is greater than that of the existing foundation pile (1), and the upper end parts of the extension piles (3) are exposed;
c. then, a plurality of horizontal fixing holes (13) are formed in the outer wall of the upper part of the existing foundation pile (1), and temporary slide rails (9) are installed through the horizontal fixing holes (13);
d. then installing a pile body connecting device, fixing two symmetrically arranged semicircular pile sleeves (5) on the outer circumference of the middle lower part of the existing foundation pile (1) through fastening bolts (6), and respectively sleeving expansion pile sliding sleeves (7) on the circumference of the upper end of an expansion pile (3) so that a temporary slide rail (9) and a track roller (10) are positioned in an inner wall groove (8), and connecting and fixing the semicircular pile sleeves (5) and the expansion pile sliding sleeves (7) into a whole through a pile body connecting seat (4);
e. after the pile body is connected, a hoop bracket (12) is installed on the outer circumference of the expansion pile (3), a hydraulic jacking device (11) is installed between the hoop bracket (12) and the pile body connecting seat (4), and the hydraulic jacking device (11) is started to jack for a certain height for pre-tightening, so that stress association is established between the existing foundation pile (1) and the expansion pile (3);
f. then installing a transverse positioning piece (15) or a vertical supporting column (16) which plays a supporting role, wherein the transverse positioning piece (15) is arranged at the lower end of the pile body connecting seat (4) or the lower end of the hoop bracket (12), or the vertical supporting column (16) is fixedly supported at the lower end of the pile body connecting seat (4) or below the hoop bracket (12), and the lower end of the vertical supporting column (16) is fixed in the soil body (2) or supported on the outer side wall of the adjacent existing foundation pile (1);
g. and finally, starting the hydraulic jacking device (11) to shrink, and then detaching the hydraulic jacking device (11) to complete the expansion and reinforcement construction of the foundation pile.
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| CN202011461412.7A CN112593584B (en) | 2020-12-14 | 2020-12-14 | Existing building foundation pile extension reinforcing structure and construction method thereof |
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| CN202011461412.7A CN112593584B (en) | 2020-12-14 | 2020-12-14 | Existing building foundation pile extension reinforcing structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324130A (en) * | 2022-08-25 | 2022-11-11 | 江苏现代工程检测有限公司 | Existing pile damage combined reinforcement treatment device and use method thereof |
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| JP2013249709A (en) * | 2012-06-04 | 2013-12-12 | Taisei Corp | Pile reinforcing structure for existing building, and constructing method thereof |
| CN104420486A (en) * | 2013-08-21 | 2015-03-18 | 贵阳铝镁设计研究院有限公司 | Method and structure for adding steel pipe pile at bottom of extended shallow foundation |
| CN106592585A (en) * | 2016-12-16 | 2017-04-26 | 兰州理工大学 | Extension body compaction pile capable of eliminating pile foundation negative friction and construction method |
| CN212001929U (en) * | 2019-11-26 | 2020-11-24 | 温州城建集团股份有限公司 | Steel reinforcement cage structure in cast-in-situ bored pile |
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2020
- 2020-12-14 CN CN202011461412.7A patent/CN112593584B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013249709A (en) * | 2012-06-04 | 2013-12-12 | Taisei Corp | Pile reinforcing structure for existing building, and constructing method thereof |
| CN104420486A (en) * | 2013-08-21 | 2015-03-18 | 贵阳铝镁设计研究院有限公司 | Method and structure for adding steel pipe pile at bottom of extended shallow foundation |
| CN106592585A (en) * | 2016-12-16 | 2017-04-26 | 兰州理工大学 | Extension body compaction pile capable of eliminating pile foundation negative friction and construction method |
| CN212001929U (en) * | 2019-11-26 | 2020-11-24 | 温州城建集团股份有限公司 | Steel reinforcement cage structure in cast-in-situ bored pile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324130A (en) * | 2022-08-25 | 2022-11-11 | 江苏现代工程检测有限公司 | Existing pile damage combined reinforcement treatment device and use method thereof |
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| CN112593584B (en) | 2022-08-05 |
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