CN110616708A - Novel variable cross-section cast-in-place pile and construction method thereof - Google Patents
Novel variable cross-section cast-in-place pile and construction method thereof Download PDFInfo
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- CN110616708A CN110616708A CN201910933178.4A CN201910933178A CN110616708A CN 110616708 A CN110616708 A CN 110616708A CN 201910933178 A CN201910933178 A CN 201910933178A CN 110616708 A CN110616708 A CN 110616708A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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Abstract
The invention belongs to the technical field of cast-in-place pile construction, and particularly provides a novel variable cross-section cast-in-place pile and a construction method thereof. The variable cross-section cast-in-place pile is simple and convenient to construct, well solves the problem that the compressive and uplift bearing capacity of the pile is insufficient, and has strong engineering practicability.
Description
Technical Field
The invention belongs to the technical field of cast-in-place pile construction, and particularly relates to a novel variable cross-section cast-in-place pile and a construction method thereof.
Background
The compression resistance and the pulling resistance of the common cast-in-place pile are general, and compared with the cast-in-place pile with the same cross section, the bearing capacity of the cast-in-place pile with the variable cross section is greatly improved, and the settlement is reduced. However, the existing variable cross-section cast-in-place pile is difficult to construct in detail and the construction cost is high.
Aiming at the series of defects, the variable cross-section cast-in-place pile can be arranged at different positions of the pile body according to different bearing capacities required by the pile foundation, the size, the position and the number of the variable cross-sections can be flexibly arranged, the device is simple and easy to implement, the manufacturing process is simple, the processing and binding are easy, the manufacturing cost is low, the implementation is convenient, the universality is strong, the defects of the equal cross-section pile and the conventional variable cross-section pile are overcome, and the variable cross-section cast-in-place pile has a good application prospect.
Disclosure of Invention
The invention aims to provide a novel variable cross-section cast-in-place pile and a construction method thereof, which at least solve the problems that the compressive and tensile bearing capacity of the conventional constant cross-section pile is weakened when in use, the conventional variable cross-section pile is difficult to construct, the cost is high and the like.
In order to achieve the above purpose, the invention provides the following technical scheme:
a novel variable cross-section bored concrete pile is located in a foundation pit and comprises a vertical pile body and a transverse outward-extending reaming reinforcement cage, wherein the outward-extending reaming reinforcement cage is arranged in an annular outer reaming hole, and the foundation pit radially and outwardly extends at an elevation where the outward-extending reaming reinforcement cage is located to form an annular outer reaming hole;
overhanging reaming steel reinforcement cage includes inlayer reaming steel reinforcement cage and outer reaming steel reinforcement cage, the diameter of outer reaming steel reinforcement cage is the same with the diameter of the vertical pile body and sets up in the foundation ditch, outer reaming steel reinforcement cage is connected on the vertical steel reinforcement cage in the vertical pile body, be provided with the guide rail on the outer reaming steel reinforcement cage, inlayer reaming steel reinforcement cage stretches out to the outer reaming of annular along the guide rail in.
According to the novel variable cross-section cast-in-place pile, preferably, the outer-layer reaming reinforcement cage comprises a guide main rib, a vertical connecting rib and a transverse connecting rib, and the guide main rib and the transverse connecting rib are connected in a cross manner to form a transverse outer-layer reinforcement mesh; the guide main ribs and the vertical connecting ribs are connected in a cross mode to form vertical outer layer reinforcing mesh, and the two transverse outer layer reinforcing mesh and the two vertical outer layer reinforcing mesh are enclosed to form a cylindrical outer layer reaming reinforcing cage.
According to the novel variable cross-section cast-in-place pile, preferably, the outer reaming reinforcement cage is connected to the vertical reinforcement cage through binding or welding.
According to the novel variable cross-section cast-in-place pile, preferably, the inner-layer reaming reinforcement cage comprises inner-layer reinforcement meshes and connecting transverse bars, a plurality of inner-layer reinforcement meshes are arranged at intervals, and the inner-layer reinforcement meshes are connected together through the connecting transverse bars to form the inner-layer reaming reinforcement cage;
the inner-layer reinforcing mesh comprises guide transverse ribs and connecting vertical ribs, the guide transverse ribs and the connecting vertical ribs are connected in a cross mode to form a latticed inner-layer reinforcing mesh, the guide transverse ribs on the top of the inner-layer reinforcing mesh and the guide transverse ribs on the bottom of the inner-layer reinforcing mesh are arranged in parallel, and the connecting vertical ribs are arranged between the guide transverse ribs on the top and the guide transverse ribs on the bottom of the inner-layer reinforcing mesh;
the guide transverse ribs at the top and the bottom of the inner-layer reaming reinforcement cage are arranged in the guide rail;
still preferably, the guide rail is a guide rail with a rectangular groove.
According to the novel variable cross-section cast-in-place pile, preferably, the outer-layer reaming reinforcement cage is of a rectangular frame structure, the two inner-layer reaming reinforcement cages are respectively arranged at two ends of the outer-layer reaming reinforcement cage, and the inner-layer reaming reinforcement cage extends into the annular outer reaming hole from the inside of the outer-layer reaming reinforcement cage; preferably, outer reaming steel reinforcement cage is provided with two, two outer reaming steel reinforcement cage cross arrangement, two outer reaming steel reinforcement cage all follows the radial setting of vertical pile body.
According to the novel variable cross-section cast-in-place pile, preferably, the transverse outer-layer steel bar mesh is of a fan-shaped annular structure, two adjacent inner-layer steel bar meshes are connected through a plurality of connecting transverse bars, each connecting transverse bar is of a telescopic structure and comprises an a sliding bar, a B sliding bar and a sliding sleeve, fixed ends of the a sliding bar and the B sliding bar are respectively connected with the inner-layer steel bar mesh, free ends of the a sliding bar and the B sliding bar penetrate into the sliding sleeve from two ends of the sliding sleeve respectively, and the a sliding bar and the B sliding bar freely slide along the sliding sleeve, so that the connecting transverse bars are extended and shortened;
still preferably, the connecting transverse bar is arranged at the joint of the guiding transverse bar and the connecting vertical bar in two adjacent inner steel bar nets.
In the novel variable cross-section cast-in-place pile, preferably, the inner-layer reamed reinforcement cage extends to the annular outer reamed hole and then partially overlaps with the outer-layer reamed reinforcement cage.
As above novel variable cross-section bored concrete pile, preferably, overhanging reaming steel reinforcement cage still includes steel reinforcement cage displacement pull rod, steel reinforcement cage displacement pull rod includes mobile jib and auxiliary rod, the mobile jib sets up in steel reinforcement cage displacement pull rod protects intraductally and follows steel reinforcement cage displacement pull rod protects the pipe free slip, stretch out at the both ends of mobile jib steel reinforcement cage displacement pull rod protects the pipe, the bottom of mobile jib is located outer reaming elevation place of annular, the one end of auxiliary rod with the bottom of mobile jib is articulated, the other end with inlayer reaming steel reinforcement cage is articulated.
The construction method of the novel variable cross-section cast-in-place pile preferably comprises the following steps:
step S1, drilling an annular outer reaming hole, and reaming at the connecting elevation of the outer layer reaming reinforcement cage and the vertical reinforcement cage to form the annular outer reaming hole;
step S2, lowering the vertical reinforcement cage in the vertical pile body into the foundation pit, and extending the outward-extending reaming reinforcement cage into the annular outer reaming hole in the step S1;
and step S3, integrally pouring the vertical reinforcement cage in the vertical pile body of the variable cross-section cast-in-place pile and the outward-extending reaming reinforcement cage to obtain the variable cross-section cast-in-place pile.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the invention provides a novel variable cross-section bored concrete pile and a construction method thereof.A hole diameter of the side wall of a foundation pit at an elevation where an outward-extending reaming reinforcement cage is located is enlarged to form an annular outward-extending reaming, the reaming reinforcement cage is bound or welded with a constant-diameter reinforcement cage of a vertical pile body of the variable cross-section bored concrete pile, the connection positions and the number are flexibly arranged according to the actual engineering situation, the outward-extending reaming reinforcement cage comprises an outer-layer reaming reinforcement cage and an inner-layer reaming reinforcement cage, and the inner-layer reaming reinforcement cage slides relative to the outer-layer reaming reinforcement cage and extends into the annular. The steel reinforcement cage displacement pull rod is connected with the inner-layer reaming steel reinforcement cage, so that the sliding of the inner-layer steel reinforcement cage is remotely controlled (the inner-layer steel reinforcement cage in the deep pile hole is controlled from the ground), the steel reinforcement cage displacement pull rod is simple in structure, and the cost is low. After concrete pouring is finished, the overhanging reaming reinforcement cage and the concrete of the equal-diameter reinforcement cage of the vertical pile body of the variable cross-section cast-in-place pile are connected into a whole, so that the compressive and tensile bearing capacity of the foundation pile is greatly enhanced. The outer-layer reaming steel reinforcement cage and the inner-layer reaming steel reinforcement cage are adopted as the outer-layer reaming steel reinforcement cage, the device is simple and easy to operate, easy to process and bind, simple in overall structure and low in construction cost. The outer-layer reaming reinforcement cage and the vertical pile body equal-diameter reinforcement cage of the variable-section cast-in-place pile are bound or welded together, so that a pile hole where the vertical pile body equal-diameter reinforcement cage of the variable-section cast-in-place pile is located and an annular outer-reaming structure are cast into a whole, the resistance to pressure and pulling of a common equal-section pile is obviously improved, the bearing capacity of the cast-in-place pile is improved, compared with the conventional variable-section pile, the variable-section positions, the variable-section number and the variable-section size of the pile can be flexibly set according to the actual engineering situation, the construction is simple and easy, the defects of the common equal-section pile are overcome, the application level of the conventional variable-section pile is also obviously improved, and therefore, the variable-section cast.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention.
Wherein:
fig. 1 is a schematic structural view of a cast-in-place pile in which an annular outer counterbore is located at the upper part of a pile body and an inner-layer counterbore reinforcement cage does not extend to the annular outer counterbore according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a cast-in-place pile after an annular outer counterbore is positioned at the upper part of a pile body and an inner-layer counterbore reinforcement cage extends out to the annular outer counterbore according to the embodiment of the invention;
fig. 3 is a schematic structural view of a cast-in-place pile with an annular outer counterbore at the bottom of the pile body and an inner-layer counterbore reinforcement cage not extending out to the annular outer counterbore according to the embodiment of the invention;
fig. 4 is a schematic structural view of a cast-in-place pile after an annular outer counterbore is located at the bottom of a pile body and an inner-layer counterbore reinforcement cage extends out to the annular outer counterbore according to the embodiment of the invention;
FIG. 5 is a view from A to A of FIG. 1 in embodiment 1 of the present invention;
FIG. 6 is a view A-A of FIG. 2 in the embodiment 1 of the present invention;
FIG. 7 is a view from A to A of FIG. 1 in embodiment 2 of the present invention;
FIG. 8 is a view from A-A of FIG. 2 in accordance with embodiment 2 of the present invention;
fig. 9 is a schematic structural view of the inner-layer reamed reinforcement cage in an unextended state according to the embodiment of the present invention;
fig. 10 is a schematic structural view of the inner-layer reamed steel reinforcement cage in an extended state according to the embodiment of the invention;
FIG. 11 is a schematic view of the positional relationship between the outer and inner reamed cages of FIG. 6
FIG. 12 is a schematic view of a rail structure according to an embodiment of the present invention;
fig. 13 is a schematic structural view of an inner-layer reamed reinforcement cage in embodiment 2 of the present invention in a non-extended state;
fig. 14 is a schematic structural view of the inner-layer reamed steel reinforcement cage in the extended state in embodiment 2 of the present invention.
In the figure: 1. a vertical reinforcement cage; 4. extending the hole enlarging reinforcement cage; 16. a steel reinforcement cage displacement pull rod; 17. a steel reinforcement cage displacement pull rod protective pipe; 21. ring-shaped outer reaming; 22. a guide rail; 23. reaming a steel reinforcement cage on the outer layer; 24. Inner-layer reaming reinforcement cages; 25. concrete grouting pipes; 26. a grouting system; 27. vertical connecting ribs; 28. A sliding sleeve; 29. guiding the main ribs; 30. transverse connecting ribs; 31. connecting the transverse ribs; 32. a guide transverse rib; 33. connecting vertical ribs; 34. a main rod; 35. and an auxiliary rod.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicate orientations or positional relationships based on those shown in the drawings, and are for convenience of description only and do not require that the present invention be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art according to specific situations.
Example 1
According to the specific embodiment of the present invention, as shown in fig. 1 to 6 and fig. 9 to 12, the present invention provides a novel variable cross-section bored concrete pile and a construction method thereof, fig. 1 is a schematic structural view of the bored concrete pile when an annular outer counterbore 21 is located at the upper part of a vertical pile body and an inner-layer counterbore reinforcement cage 24 does not extend out to the annular outer counterbore 21;
fig. 2 is a schematic structural diagram of the cast-in-place pile after the annular outer counterbore 21 is located at the upper part of the vertical pile body and the inner layer counterbore steel reinforcement cage 24 extends out of the annular outer counterbore 21. The cast-in-place pile is positioned in a foundation pit, a vertical reinforcement cage 1 with the same diameter as that of the vertical pile body is arranged in the foundation pit, the cast-in-place pile comprises the vertical pile body and an outward-extending reaming reinforcement cage 4 arranged at the upper part of the vertical pile body, the outward-extending reaming reinforcement cage 4 is arranged in an annular outward reaming 21, the outward-extending reaming reinforcement cage 4 can be connected with the vertical reinforcement cage 1 in the vertical pile body of the cast-in-place pile with the variable cross section through binding or welding, the position of the annular outward reaming 21 can be positioned at any position of the vertical pile body, the specific position, the number and the cross section size can be flexibly set according to the actual engineering situation, and the side wall of the foundation pit with the outward-extending reaming cage 4 at the standard height radially expands to form the annular. Meanwhile, the grouting system 26 is arranged on the ground, a concrete grouting pipe 25 is connected to the grouting system 26, and the concrete grouting pipe 25 penetrates through the vertical pile body and is used for pouring concrete into the vertical pile body.
The grouting system 26 is used for grouting in a foundation pit where the vertical steel reinforcement cage 1 in the vertical pile body of the variable-section cast-in-place pile and the annular outer reaming hole 21 where the outer reaming reinforcement cage 4 is located.
The elevation department stretches out to the outer reaming 21 of annular in from the vertical steel reinforcement cage 1 junction in outer reaming steel reinforcement cage 4 and the vertical pile body of variable cross section bored concrete pile in one end of overhanging reaming steel reinforcement cage 4, behind the concreting, vertical pile body reinforced concrete of variable cross section bored concrete pile and the outer reaming steel reinforcement 4 concrete connection in the reaming 21 of annular become an organic whole, form annular evagination structure, when the bored concrete pile receives drawing power and ballast power, this annular evagination structure can firmly block and establish in the outer reaming 21 of annular, thereby resistance to drawing bearing capacity and resistance to compression bearing capacity when having increased the follow-up use of this foundation pile.
Further, overhanging reaming steel reinforcement cage 4 includes inlayer reaming steel reinforcement cage 24, is provided with guide rail 22 on the outer reaming steel reinforcement cage 23, and inlayer reaming steel reinforcement cage 24 moves along guide rail 22, and outer reaming steel reinforcement cage 23 is stretched out to the annular in the reaming 21 outside to the one end of inlayer reaming steel reinforcement cage 24. The inner-layer reaming steel reinforcement cage 24 is arranged to penetrate into the annular outer reaming 21, the vertical pile body reinforced concrete of the variable cross-section cast-in-place pile can be well combined with the outer reaming steel reinforcement 4 concrete in the annular outer reaming 21 after concrete is poured subsequently, the pulling-resistant bearing capacity of the variable cross-section cast-in-place pile is greatly improved, the inner-layer reaming steel reinforcement cage 24 is arranged to stretch freely relative to the outer-layer reaming steel reinforcement cage 23, and the defect that steel reinforcements are difficult to directly arrange in the annular outer reaming 21 is overcome.
Further, the outward-extending reaming reinforcement cage 4 further comprises an outer-layer reaming reinforcement cage 23, the outer-layer reaming reinforcement cage 23 comprises a guide main rib 29, a vertical connecting rib 27 and a transverse connecting rib 30, and the guide main rib 29 and the transverse connecting rib 30 are in cross connection to form a transverse outer-layer reinforcement mesh; the main guide bars 29 and the vertical connecting bars 27 are connected in a crossed manner to form a vertical outer reinforcing mesh, and the two horizontal outer reinforcing meshes and the two vertical outer reinforcing meshes are enclosed to form a cylindrical outer-layer expanded-hole reinforcing cage 23. The guide rail 22 is arranged in the outer-layer reaming reinforcement cage 23, and the outer-layer reaming reinforcement cage 23 is bound with or welded with a vertical reinforcement cage in a vertical pile body of the variable-section cast-in-place pile. Further, inner reaming steel reinforcement cage 24 includes inner mesh reinforcement and horizontal muscle of connection 31, and a plurality of inner mesh reinforcement intervals set up, links together through horizontal muscle of connection 31 between a plurality of inner mesh reinforcement, forms inner reaming steel reinforcement cage 24.
The inner layer reinforcing mesh comprises guide transverse ribs 32 and connecting vertical ribs 33, a plurality of guide transverse ribs 32 and the connecting vertical ribs 33 are connected in a cross mode to form a latticed inner layer reinforcing mesh, the guide transverse ribs 32 on the top of the inner layer reinforcing mesh and the guide transverse ribs 32 on the bottom of the inner layer reinforcing mesh are arranged in parallel, and the connecting vertical ribs 33 are arranged between the guide transverse ribs 32 on the top and the bottom of the inner layer reinforcing mesh; in the embodiment of the invention, the inner steel bar net comprises a plurality of parallel guide transverse bars 32 and a plurality of parallel connecting vertical bars 33, and the plurality of guide transverse bars 32 and the plurality of connecting vertical bars 33 are in vertical angle cross connection to form the inner steel bar net. A circumferential guide cross bar 32 of the inner reamed reinforcement cage 24 is disposed within the guide track 22. In an embodiment of the present invention, the circumferential guide cross bar 32 of the inner reamed reinforcement cage 24 is a guide cross bar 32 that is directly accessible from outside the inner reamed reinforcement cage 24. These guide bars are located on the outermost layer of the inner reamed cage 24.
In the embodiment of the invention, in order to further increase the connection strength between the concrete of the external reaming reinforcement 4 in the annular external reaming 21 and the reinforced concrete of the vertical pile body of the variable cross-section cast-in-place pile, the inner layer reaming reinforcement cage 24 is partially overlapped with the outer layer reaming reinforcement cage 23 after extending out of the annular external reaming 21. After the subsequent concrete pouring, the vertical pile body reinforced concrete of the variable cross-section cast-in-place pile and the concrete of the outward-extending reaming reinforcing steel bar 4 in the annular outward reaming 21 can form high-strength connection.
Further, the variable cross-section bored concrete pile body is provided with steel reinforcement cage displacement pull rod pillar 17 along the axis direction, overhanging reaming steel reinforcement cage 4 still includes steel reinforcement cage displacement pull rod 16, steel reinforcement cage displacement pull rod 16 includes mobile jib 34 and auxiliary rod 35, mobile jib 34 sets up in steel reinforcement cage displacement pull rod pillar 17 and follows steel reinforcement cage displacement pull rod pillar 17 free slip, steel reinforcement cage displacement pull rod pillar 17 is stretched out at the both ends of mobile jib 34, the bottom of mobile jib 34 is located the upper and lower elevation certain range of outer reaming steel reinforcement cage and the vertical pile body equal diameter steel reinforcement cage junction of variable cross-section bored concrete pile, the one end of auxiliary rod 35 is articulated with the bottom of mobile jib 34, the other end is articulated with inlayer reaming steel reinforcement cage 24. The steel reinforcement cage displacement pull rod protective tube 17 not only plays a role in protecting the steel reinforcement cage displacement pull rod 16, but also ensures the free sliding of the pull rod in the vertical direction.
Further, the guide rail 22 is a guide rail with a rectangular groove, the guide rail 22 is arranged (preferably welded) on the upper end surface and the lower end surface in the outer-layer reinforcement cage 23, the guide rail 22 is arranged in pairs along the central line of the cross section of the outer-layer reinforcement cage 23, the guide rail 22 plays a role in protecting and guiding the inner-layer reaming reinforcement cage 24, the friction coefficient of the surface of the sliding guide rail 22 in contact with the guide transverse rib 32 is low, and the sliding of the inner-layer reaming reinforcement cage 24 is facilitated.
The top of vertical pile body is exposed at the top of mobile jib 34, is connected mobile jib 34 and jack-up stretching device, starts hoisting apparatus, and hoisting apparatus drives mobile jib 34 upward movement, and mobile jib 34 drives the also upward movement simultaneously of articulated vice pole 35 with it, and vice pole 35 drives articulated inlayer reaming steel reinforcement cage 24 with it and opens and stretch out to the outer reaming 21 of annular along the guide rail in.
The invention also provides a construction method of the novel variable cross-section cast-in-place pile, which comprises the following steps:
and step S1, drilling a pile hole by adopting a drilling machine, and reaming the part of the side wall of the foundation pit in a certain range of the upper elevation and the lower elevation at the joint of the outer layer reaming reinforcement cage 4 and the equal-diameter reinforcement cage of the vertical pile body of the variable cross-section cast-in-place pile to form an annular outer reaming 21, wherein the reaming process comprises high-pressure jet grouting reaming and mechanical reaming. After the pile hole is drilled to the designed elevation, the drill bit is replaced, high-pressure rotary jet reaming or mechanical reaming is carried out, and water or cement slurry can be used for the high-pressure jet reaming. When the cement slurry reaming process is adopted, reaming is carried out at least twice up and down and back and forth; when the water reaming process is adopted, the cement grout is adopted for reaming once, and finally hole cleaning and pile hole inspection and acceptance are carried out.
Step S2, placing the equal-diameter reinforcement cage of the vertical pile body of the variable cross-section cast-in-place pile into the foundation pit, and extending the outward-extending reaming reinforcement cage 4 into the annular outward-extending reaming 21; the method specifically comprises the following steps: the main rod 34 of the cage displacement rod 16 is mechanically stretched in the vertical direction to obtain the state of the inner-layer reamed cage 24 and the cage displacement rod 16 after sliding as shown in fig. 6. Fig. 9 and 10 show the inner reamed cage 24 and the cage displacement tie 16 before and after the inner reamed cage 24 is extended, and fig. 10 shows the inner reamed cage 24 after mechanical stretching of fig. 9. After the steel reinforcement cage displacement pull rod 16 is stretched, because vice pole 35 is to the pushing action of inlayer reaming steel reinforcement cage 24, inlayer reaming steel reinforcement cage 24 slides to outer reaming 21 of annular along guide rail 22, and outer reaming steel reinforcement cage 23 receives the restraint of the vertical pile body steel reinforcement cage of variable cross section bored concrete pile because of vertical splice bar 27, remains motionless throughout. After the sliding is finished, the outer-layer reaming steel reinforcement cage 23 and the inner-layer reaming steel reinforcement cage 24 keep overlapping and overlapping with each other for a certain length, and the integrity of the steel reinforcement cages is guaranteed. According to the invention, the external reaming steel reinforcement cage 4 is opened immediately after the equal-diameter steel reinforcement cage of the vertical pile body of the variable-section cast-in-place pile is put down, so that the phenomenon that impurities such as soil enter the annular external reaming 21 during subsequent construction to influence the normal opening of the inner reaming steel reinforcement cage 24 is avoided.
Step S3, pouring concrete into the foundation pit where the vertical pile body steel reinforcement cage of the variable cross-section cast-in-place pile is located and the annular outer reaming 21 where the outer reaming steel reinforcement cage 4 is located through the grouting system 26 and the concrete grouting pipe 25, and integrally pouring the vertical pile body steel reinforcement cage of the variable cross-section cast-in-place pile and the outer reaming steel reinforcement cage 4 to form the novel variable cross-section cast-in-place pile, wherein the novel variable cross-section cast-in-place pile commonly bears the pull-up acting force and the pull-down bearing force, and the pull-out resistance of the cast-in-.
In order to facilitate the inside layer reaming steel reinforcement cage 24 and stretch out through guide rail 22 faster than outer layer reaming steel reinforcement cage 23, as shown in fig. 5 and fig. 6, when concrete implementation, outer layer reaming steel reinforcement cage 23 can be cuboid frame construction, and outer layer reaming steel reinforcement cage 23 sets up along the radial setting in stake hole, and two inside layer reaming steel reinforcement cages 24 set up the both ends at outer layer reaming steel reinforcement cage 23 respectively, in the reaming 21 outside the extension to the annular of outer layer reaming steel reinforcement cage 23. Outer reaming steel reinforcement cage 23 is provided with two, and two outer reaming steel reinforcement cages 23 cross arrangement form the horizontal steel reinforcement cage system of sliding of cross, and two outer reaming steel reinforcement cages 23 all follow the radial setting in stake hole.
Example 2
In order to increase the overall coverage area of the overhung reaming reinforcement cage 4 after being overhung, as shown in fig. 7, 8, 13 and 14, in a specific implementation, the transverse outer-layer reinforcement mesh may also be a fan-ring shape, two adjacent inner-layer reinforcement meshes are connected by the connecting transverse rib 31, the connecting transverse rib 31 is of a telescopic structure, the connecting transverse rib 31 includes an a sliding rib, a B sliding rib and a sliding sleeve 28, fixed ends of the a sliding rib and the B sliding rib are respectively connected with the inner-layer reinforcement meshes, free ends of the a sliding rib and the B sliding rib respectively penetrate into the sliding sleeve 28 from two ends of the sliding sleeve 28, and the a sliding rib and the B sliding rib slide along the sliding sleeve 28, so as to achieve extension and shortening of the connecting transverse rib 31; the connecting transverse bar 31 is arranged at the joint of the guiding transverse bar 32 and the connecting vertical bar 33 in two adjacent inner steel bar nets.
When the reamer is used, the inner-layer reaming steel reinforcement cage 24 is guided by the guide rail 22, the inner-layer reaming steel reinforcement cage 24 extends out of the outer-layer reaming steel reinforcement cage 23 into the annular outer reaming 21, the connecting transverse ribs 31 between the inner-layer steel reinforcement meshes extend, specifically, the sliding ribs A and the sliding ribs B extend out relative to the sliding sleeve, in order to prevent the sliding ribs A and/or the sliding ribs B from separating from the sliding sleeve, guide grooves can be formed in the side wall of the sliding sleeve, guide pins are arranged at the free ends of the sliding ribs A and the sliding ribs B and are arranged in the guide grooves, so that the sliding ribs A and/or the sliding ribs B are prevented from separating from the sliding sleeve, and of course, other schemes capable of achieving the purposes are also possible. The sliding ribs A and B can be mechanically bent by a steel bar bending machine firstly. Of course, the a sliding rib and the B sliding rib may be formed in a straight line shape. Other structures and construction methods are the same as those of embodiment 1, and are not described again.
In summary, according to the novel variable cross-section cast-in-place pile and the construction method thereof provided by the invention, the side wall of the foundation pit is expanded to form the annular outer reaming 21 within a certain range of the upper and lower elevations of the joint of the overhanging reaming reinforcement cage 4 and the vertical reinforcement cage 1 in the variable cross-section cast-in-place pile vertical pile body, the overhanging reaming reinforcement cage 4 is connected with the vertical reinforcement cage 1 in the variable cross-section cast-in-place pile vertical pile body, and the connection positions are flexibly arranged according to the actual engineering conditions, as shown in fig. 1 to 4. This overhanging reaming steel reinforcement cage 4 includes outer reaming steel reinforcement cage 23 and inlayer steel reinforcement cage 24, and inlayer reaming steel reinforcement cage 24 slides for outer reaming steel reinforcement cage 23 and stretches out in annular outer reaming 21. Set up steel reinforcement cage displacement pull rod 16 and be connected with inlayer reaming steel reinforcement cage 24 to realized remotely controlling the slip of inlayer steel reinforcement cage (controlling the downthehole inlayer steel reinforcement cage of deep pile from ground), steel reinforcement cage displacement pull rod 16 simple structure, the cost is lower. After concrete pouring is carried out, the concrete of the external extended hole-expanding reinforcing steel bars 4 in the annular external reamed holes 21 and the concrete of the vertical pile body of the cast-in-place pile with the variable cross section are connected into a whole, so that the compression resistance and the tensile resistance bearing capacity of the cast-in-place pile in the subsequent use process are greatly enhanced. The outer-layer reaming steel reinforcement cage 23 and the inner-layer reaming steel reinforcement cage 24 are used as the extending devices, the device is simple and easy to operate, easy to process and bind, simple in overall structure and low in construction cost. And the reinforced concrete formed after the subsequent concrete pouring has stronger integrity and higher strength. The outer-layer reaming reinforcement cage 23 is connected with the variable-cross-section cast-in-place pile vertical pile body reinforcement cage, so that a foundation pit where the variable-cross-section cast-in-place pile vertical pile body reinforcement cage is located and an annular outer reaming structure are cast into a whole, the resistance to compression and pulling of the cast-in-place pile is obviously improved, and the bearing capacity of the cast-in-place pile is improved, so that the cast-in-place pile vertical pile body reinforcement cage has a good application prospect in.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The novel variable cross-section cast-in-place pile is characterized in that the cast-in-place pile is located in a foundation pit and comprises a vertical pile body and a transversely outward-extending reaming reinforcement cage, the outward-extending reaming reinforcement cage is arranged in an annular outer reaming hole, and the foundation pit radially and outwardly extends at an elevation where the outward-extending reaming reinforcement cage is located to form an annular outer reaming hole;
overhanging reaming steel reinforcement cage includes inlayer reaming steel reinforcement cage and outer reaming steel reinforcement cage, the diameter of outer reaming steel reinforcement cage is the same with the diameter of the vertical pile body and sets up in the foundation ditch, outer reaming steel reinforcement cage is connected on the vertical steel reinforcement cage in the vertical pile body, be provided with the guide rail on the outer reaming steel reinforcement cage, inlayer reaming steel reinforcement cage stretches out to the outer reaming of annular along the guide rail in.
2. A novel variable cross-section bored concrete pile according to claim 1, wherein said outer reamed cage includes a guide main rib, a vertical connecting rib, and a transverse connecting rib, said guide main rib being cross-connected to said transverse connecting rib to form a transverse outer mesh reinforcement; the guide main ribs and the vertical connecting ribs are connected in a crossed mode to form vertical outer layer reinforcing mesh, and the two horizontal outer layer reinforcing mesh and the two vertical outer layer reinforcing mesh are enclosed to form a cylindrical outer layer reaming reinforcing cage.
3. A novel variable cross-section bored concrete pile according to claim 2, wherein said outer reamed reinforcement cage is connected to the vertical reinforcement cage by lashing or welding.
4. The novel variable cross-section bored concrete pile as claimed in claim 2, wherein said inner-layer expanded steel reinforcement cage comprises an inner-layer steel reinforcement mesh and a connecting cross bar, a plurality of inner-layer steel reinforcement meshes are arranged at intervals, and a plurality of said inner-layer steel reinforcement meshes are connected together through the connecting cross bar to form the inner-layer expanded steel reinforcement cage;
the inner-layer reinforcing mesh comprises guide transverse ribs and connecting vertical ribs, the guide transverse ribs and the connecting vertical ribs are connected in a cross mode to form a latticed inner-layer reinforcing mesh, the guide transverse ribs on the top of the inner-layer reinforcing mesh and the guide transverse ribs on the bottom of the inner-layer reinforcing mesh are arranged in parallel, and the connecting vertical ribs are arranged between the guide transverse ribs on the top and the guide transverse ribs on the bottom of the inner-layer reinforcing mesh;
the guide transverse ribs at the top and the bottom of the inner-layer reaming reinforcement cage are arranged in the guide rail;
preferably, the guide rail is a guide rail with a rectangular groove.
5. The novel variable cross-section bored concrete pile according to claim 2, wherein the outer reamed reinforcement cage is a rectangular parallelepiped frame structure, and two of the inner reamed reinforcement cages are respectively disposed at both ends of the outer reamed reinforcement cage and extend from the inside of the outer reamed reinforcement cage into the annular outer reamed hole; preferably, outer reaming steel reinforcement cage is provided with two, two outer reaming steel reinforcement cage cross arrangement, two outer reaming steel reinforcement cage all follows the radial setting of vertical pile body.
6. The novel variable cross-section cast-in-place pile as claimed in claim 4, wherein the transverse outer steel bar mesh is of a fan-ring structure, two adjacent inner steel bar meshes are connected by a plurality of connecting transverse bars, each connecting transverse bar is of a telescopic structure, each connecting transverse bar comprises an A sliding bar, a B sliding bar and a sliding sleeve, fixed ends of the A sliding bar and the B sliding bar are respectively connected with the inner steel bar mesh, free ends of the A sliding bar and the B sliding bar penetrate into the sliding sleeve from two ends of the sliding sleeve, and the A sliding bar and the B sliding bar slide freely along the sliding sleeve to realize extension and shortening of the connecting transverse bars;
preferably, the connecting transverse bar is arranged at the joint of the guide transverse bar and the connecting vertical bar in two adjacent inner steel bar nets.
7. A novel variable cross-section bored concrete pile according to claim 6, wherein said inner reamed cage extends to said annular outer reamed area and partially overlaps said outer reamed cage.
8. A novel variable cross-section bored concrete pile according to any one of claims 1 to 6, wherein the overhanging reaming steel reinforcement cage further includes steel reinforcement cage displacement pull rod, steel reinforcement cage displacement pull rod includes mobile jib and auxiliary rod, the mobile jib sets up in the steel reinforcement cage displacement pull rod protects intraductally and follows steel reinforcement cage displacement pull rod protects the pipe and freely slides, the both ends of mobile jib stretch out steel reinforcement cage displacement pull rod protects the pipe, the bottom of mobile jib is located the outer reaming elevation department of annular, the one end of auxiliary rod with the bottom of mobile jib is articulated, the other end with inlayer reaming steel reinforcement cage is articulated.
9. The construction method of the novel variable cross-section cast-in-place pile as claimed in any one of claims 1 to 8, wherein the construction method comprises the following steps:
step S1, drilling an annular outer reaming hole, and reaming at the connection elevation of the outer layer reaming reinforcement cage and the vertical reinforcement cage to form the annular outer reaming hole;
step S2, lowering the vertical reinforcement cage in the vertical pile body into the foundation pit, and extending the outward-extending reaming reinforcement cage into the annular outer reaming hole in the step S1;
and step S3, integrally pouring the vertical reinforcement cage in the vertical pile body of the variable cross-section cast-in-place pile and the outward-extending reaming reinforcement cage to obtain the variable cross-section cast-in-place pile.
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| CN111335365A (en) * | 2020-03-14 | 2020-06-26 | 何艳 | Anti-pulling ring platform steel reinforcement cage device on cylindrical anti-pulling pile steel reinforcement cage |
| CN111335366A (en) * | 2020-03-14 | 2020-06-26 | 何艳 | Method for arranging anti-pulling ring platform steel reinforcement cage in anti-pulling ring groove |
| CN111472376A (en) * | 2020-03-17 | 2020-07-31 | 中国电力工程顾问集团西北电力设计院有限公司 | Construction method of prefabricated root key type sheet pile foundation |
| CN113774904A (en) * | 2021-09-24 | 2021-12-10 | 中交一航局第四工程有限公司 | Construction process of rooting enhanced cast-in-place pile |
| CN114482022A (en) * | 2021-12-06 | 2022-05-13 | 中铁二院北方勘察设计有限责任公司 | Construction method of prestressed manual hole digging pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111335365A (en) * | 2020-03-14 | 2020-06-26 | 何艳 | Anti-pulling ring platform steel reinforcement cage device on cylindrical anti-pulling pile steel reinforcement cage |
| CN111335366A (en) * | 2020-03-14 | 2020-06-26 | 何艳 | Method for arranging anti-pulling ring platform steel reinforcement cage in anti-pulling ring groove |
| CN111335365B (en) * | 2020-03-14 | 2021-06-01 | 浙江新华建设有限公司 | Anti-pulling ring platform steel reinforcement cage device on cylindrical anti-pulling pile steel reinforcement cage |
| CN111335366B (en) * | 2020-03-14 | 2021-07-02 | 南通居者安建筑科学研究院有限公司 | Method for arranging anti-pulling ring platform steel reinforcement cage in anti-pulling ring groove |
| CN111472376A (en) * | 2020-03-17 | 2020-07-31 | 中国电力工程顾问集团西北电力设计院有限公司 | Construction method of prefabricated root key type sheet pile foundation |
| CN113774904A (en) * | 2021-09-24 | 2021-12-10 | 中交一航局第四工程有限公司 | Construction process of rooting enhanced cast-in-place pile |
| CN114482022A (en) * | 2021-12-06 | 2022-05-13 | 中铁二院北方勘察设计有限责任公司 | Construction method of prestressed manual hole digging pile |
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