CN117868106A - Construction structure and construction method of slow-bonding prestressed uplift pile - Google Patents
Construction structure and construction method of slow-bonding prestressed uplift pile Download PDFInfo
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- CN117868106A CN117868106A CN202410164158.6A CN202410164158A CN117868106A CN 117868106 A CN117868106 A CN 117868106A CN 202410164158 A CN202410164158 A CN 202410164158A CN 117868106 A CN117868106 A CN 117868106A
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- 238000010276 construction Methods 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 228
- 239000010959 steel Substances 0.000 claims abstract description 228
- 230000002787 reinforcement Effects 0.000 claims abstract description 179
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 238000004873 anchoring Methods 0.000 claims description 31
- 239000000725 suspension Substances 0.000 claims description 19
- 238000003466 welding Methods 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
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Abstract
The invention relates to a construction structure of a slow-bonding prestress anti-pulling pile and a construction method thereof, wherein the construction structure comprises a pile foundation hole, reinforcement cages and slow-bonding steel strands, wherein a plurality of reinforcement cages which are vertically aligned and welded and fixed are arranged in the pile foundation hole from bottom to top, and the slow-bonding steel strands are anchored on the inner peripheral surfaces of odd-numbered reinforcement cages which are arranged from bottom to top except the reinforcement cage at the top; when the construction is carried out, when the odd-numbered section steel reinforcement cages are welded with the even-numbered section steel reinforcement cages, the slow bonding steel strands in the odd-numbered section steel reinforcement cages extend to the outer peripheral surface of the connected even-numbered section steel reinforcement cages along the tops of the slow bonding steel strands, before the top steel reinforcement cages are welded, all the slow bonding steel strands are converged and then extend into the top steel reinforcement cages, pile foundation holes extending from the top steel reinforcement cages are distributed in a central symmetry mode, finally concrete is poured into the pile foundation holes, and after solidification, the slow bonding steel strands reach the design requirement tensile force through tensioning, so that the anti-pulling pile is formed.
Description
Technical Field
The invention relates to the field of building structures, in particular to a construction structure of a slow-bonding prestressed uplift pile and a construction method thereof.
Background
At present, the uplift pile in the building field is widely applied to the uplift resistance of large basements, the uplift resistance of high-rise building (construction), the uplift resistance of offshore wharf platforms, anchor pile foundations of suspension bridges and cable-stayed bridges, pile foundations of large dock bottom plates, anchor pile foundations in static load test piles and the like. The pile is driven to counteract the upward buoyancy of water in soil to the underground structure if the underground structure of the building engineering has a part lower than the water level of surrounding soil; the working mechanism is mainly to resist the axial tension by the friction force between the pile body and the soil layer. In order to prevent cracking, the prior anti-pulling pile generally needs to pre-apply prestress to the pile inner structure during construction, so that the tensile stress caused by load can be completely or partially counteracted during the service period of the structure, and structural damage is avoided. The existing prestressing mode is as in publication No. CN116220011A published in Chinese patent literature, publication No. 2023, no. 6 and No. 6, and the invention is named as a construction method of a slow-bonding prestressing pulling pile. This solution, although viable, has the following drawbacks: when the whole steel strand is tensioned and prestressed, the whole pile body is prestressed once, when the pile body is longer or the number of the steel strands is more, the prestress in the pile body is often unevenly distributed, the local prestress is overlarge, the local prestress is insufficient, the stable application of the prestress is difficult to ensure, and the quality of the uplift pile is influenced. For this reason, improvements are needed to the existing construction and method for prestressing the uplift pile,
disclosure of Invention
In order to overcome the defects, the invention aims to provide a construction structure and a construction method of a slow-bonding prestressed uplift pile, which solve the technical problems that the existing similar uplift pile is poor in prestressed structure, so that the prestress of a pile body is inconvenient to apply, uneven in distribution, unstable in stress and influence on the quality of the uplift pile. The aim is achieved by the following technical scheme.
The construction structure of the anti-pulling pile comprises pile foundation holes, reinforcement cages and anti-pulling steel strands, wherein all the anti-pulling steel strands in the anti-pulling pile are distributed in annular central symmetry relative to the central line of a pile shaft of the anti-pulling pile; the pile foundation hole is characterized in that a plurality of sections of steel reinforcement cages which are vertically aligned and welded and fixed are arranged in the pile foundation hole from bottom to top, vertical slow bonding steel strands which are uniformly distributed at intervals along the peripheral surface are anchored on the inner peripheral surfaces of odd sections of steel reinforcement cages which are arranged from bottom to top except the steel reinforcement cage at the top, the number of the slow bonding steel strands is even, the number of the slow bonding steel strands in each odd section is equal, and the sum of the number of the slow bonding steel strands in all odd sections is the total number of the slow bonding steel strands in the anti-pulling pile; the slow bonding steel strands in each odd-numbered section steel reinforcement cage extend to the outer peripheral surface of the connected even-numbered section steel reinforcement cage along the tops of the odd-numbered section steel reinforcement cages, and extend into the steel reinforcement cage at the top end after converging, extend to the pile foundation hole opening from the tops of the steel reinforcement cages at the top end, and the steel reinforcement cages and the slow bonding steel strands are fixed along with the casting concrete in the pile foundation hole. Through the structure, the arrangement scheme that the traditional slow bonding steel strands are directly penetrated to the top from the bottom is changed into the segmented arrangement scheme, so that stable prestress can be formed by each segment in the anti-pulling pile, the prestress is uniformly distributed, the anti-pulling capability is strong, the structure of the anti-pulling pile is stable, the anti-pulling pile is not easy to crack, and the quality of the anti-pulling pile is improved.
And the end part of the slow bonding steel strand is anchored with the steel bar cage through an anti-pulling anchoring part, and the anti-pulling structure is formed after the anchoring part of the slow bonding steel strand is fixed along with concrete casting. Through the structure, the slow bonding steel strand forms a reliable anti-pulling structure.
The anchoring piece comprises an extrusion anchor, a bearing plate and a spiral rib, wherein the bearing plate is welded with the spiral rib and sleeved at one end of the slow bonding steel strand, and the end of the slow bonding steel strand is extruded and fixed to form limit on the bearing plate by the extrusion anchor. The structure is a concrete implementation structure of the anchoring piece.
The anchoring piece of the slow-bonding steel strand is fixed with the steel reinforcement cage through binding and/or welding, and a guide steel bar for preventing the concrete pouring pipe from extending into the steel reinforcement cage to collide with the anchoring piece is welded between the anchoring piece and the steel reinforcement cage. Through this structure, the construction is comparatively convenient, safe.
And the slow bonding steel strands in the odd-numbered section steel reinforcement cages are distributed in a central symmetry mode relative to the center line of the steel reinforcement cage. Through this structure, the prestressing force that makes the interior slow bonding steel strand wires of every section steel reinforcement cage is applyed comparatively evenly, is stable.
The positions of the reinforcement cage, which are connected with the slow-bonding steel strands, and/or the positions of the reinforcement cage, which are close to the two ends, are/is fixedly provided with reinforcement hoops, and the positions of the slow-bonding steel strands, which pass through the reinforcement hoops, are bound and fixed. Through this structure, improve the stability that steel reinforcement cage and slow bonding steel strand wires are connected, improve the structural stability of steel reinforcement cage simultaneously.
The inner ring of the reinforced hoop is provided with annular ribs distributed in an array mode at intervals. By this structure, stability of the reinforcing band is ensured. The construction method of the slow-bonding prestressed uplift pile construction structure comprises the following construction steps:
step one: the end part of the slow bonding steel strand is manufactured to form the anchoring piece for resisting pulling;
step two: hoisting the first odd-numbered section steel reinforcement cage to the pile foundation hole through suspension equipment, extending a required number of slow-bonding steel strands into the odd-numbered section steel reinforcement cage, binding and/or welding the slow-bonding steel strands with the steel reinforcement cage through anchoring pieces, and placing the steel reinforcement cage into the pile foundation hole through the suspension equipment after the slow-bonding steel strands are fixed;
step three: placing the next even-numbered section of reinforcement cages through suspension equipment, enabling slow-bonding steel strands of the odd-numbered section of reinforcement cages to extend out of the reinforcement cages from the tops of the reinforcement cages, aligning the bottoms of the even-numbered section of reinforcement cages with the tops of the first odd-numbered section of reinforcement cages, and welding and fixing the even-numbered section of reinforcement cages;
step four: placing the next odd-numbered section steel reinforcement cage through suspension equipment, aligning, welding and fixing the bottom of the odd-numbered section steel reinforcement cage with the top of the previous even-numbered section steel reinforcement cage, enabling a required number of slow-bonding steel strands to extend into the odd-numbered section steel reinforcement cage, binding and/or welding and fixing the slow-bonding steel strands with the steel reinforcement cage through anchoring pieces, enabling the slow-bonding steel strands to extend out of the steel reinforcement cage from the top of the odd-numbered section steel reinforcement cage after being fixed, and enabling the suspension equipment to continuously lower the whole steel reinforcement cage into a pile foundation hole;
step five: repeating the operations of the third step and the fourth step, wherein all the slow bonding steel strands extend out of the steel reinforcement cage and are distributed in an annular central symmetry mode relative to the central line of the whole steel reinforcement cage;
step six: hoisting the last section of reinforcement cage through suspension equipment, gathering all the slow-bonding steel strands, penetrating out the last section of reinforcement cage to the pile foundation hole opening, aligning the bottom of the last section of reinforcement cage with the top of the even section of reinforcement cage, welding and fixing, and placing the whole reinforcement cage into a pile foundation hole after fixing;
step seven: and pouring concrete into the pile foundation hole, and tensioning the slow bonding steel strand to reach the tensioning force required by design through tensioning equipment after the concrete is solidified, so that the construction of the slow bonding prestress anti-pulling pile construction structure is completed.
In the construction method, after the anchoring piece of the slow-bonding steel strand in the odd-numbered section steel reinforcement cage is anchored and fixed, a guide protection steel bar for preventing collision with the anchoring piece when the concrete pouring pipe stretches into the steel reinforcement cage is welded between the anchoring piece and the steel reinforcement cage. Through the mode, the steel strand wires and steel reinforcement cage anchor structure play effective protection.
In the construction method, the tensioning method in the step seven is as follows: the anti-pulling pile is characterized in that a tensioning base is placed at the top of the anti-pulling pile, bayonets for vertically guiding and penetrating through the slow-bonding steel strands are circumferentially arranged on the tensioning base, namely, the bayonets in the circumferential direction of the tensioning base are distributed in an annular central symmetry mode, all the slow-bonding steel strands penetrate through anti-slip gaskets and single-hole anchor plates while penetrating through the bayonets, two slow-bonding steel strands distributed in the central symmetry mode are used as a group, the two slow-bonding steel strands in each group are simultaneously tensioned through tensioning equipment, and after tensioning, locking fixation is formed on the slow-bonding steel strands through clamping pieces inserted into a single Kong Maoban.
The invention realizes uniform prestress distribution in the anti-pulling pile, strong anti-pulling capability, stable structure, difficult cracking and simpler and more efficient integral construction mode by changing the arrangement mode of the traditional slow-bonding steel strands, and is suitable for being used as the slow-bonding prestress anti-pulling pile construction structure or the improvement of the similar construction structure.
Drawings
FIG. 1 is a schematic diagram of a distribution structure of local slow bonding steel strands in a uplift pile.
Fig. 2 is a schematic view of the top surface internal structure of fig. 1.
Fig. 3 is a schematic view of the anchoring connection structure of the slow bonding steel strand in the first odd-numbered section steel reinforcement cage of the invention.
Fig. 4 is a schematic structural view of the slow-bonding steel strand of the present invention extending from the top of the odd-numbered section of reinforcement cage to the outside of the connected even-numbered section of reinforcement cage.
Fig. 5 is a schematic structural view of the slow-bonding steel strand extending from the top of the even-numbered reinforcement cages to the inside of the top reinforcement cage.
Fig. 6 is a schematic diagram of a tension structure of the present invention.
The serial numbers and names in the figures are: 1. uplift pile, 2, reinforcement cage, 201, odd-numbered reinforcement cage, 202, even-numbered reinforcement cage, 203, spiral reinforcement, 204, vertical reinforcement, 205, reinforcement hoop, 2051, ring reinforcement, 206, guiding protection reinforcement, 3, slow bonding steel strand, 4, anchor, 401, extrusion anchor, 402, bearing plate, 403, spiral reinforcement, 5, tensioning base, 501, bayonet, 6, anti-slip spacer, 7, single hole anchor plate, 8, clamping piece.
Description of the embodiments
The invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1-5, the construction structure of the uplift pile 1 comprises pile foundation holes, a reinforcement cage 2 and slow bonding steel strands 3, wherein all the slow bonding steel strands in the uplift pile are distributed in annular central symmetry relative to the pile shaft center line of the uplift pile. The pile foundation hole is internally provided with a plurality of steel reinforcement cages which are vertically aligned and welded and fixed from bottom to top, each steel reinforcement cage is formed by welding a plurality of vertical steel reinforcements 204 which are distributed in an annular array through the inner rings of spiral steel reinforcements 203, and reinforcement hoops 205 are welded and arranged in the steel reinforcement cages close to the middle and/or at two ends, are annular and are provided with ring ribs 2051 in an annular array on the inner side, so that the reinforcement cage reinforcement support function is achieved. In the pile foundation hole, except the reinforcement cage at the top, the inner peripheral surface of the odd-numbered reinforcement cage 201 arranged from the bottom to the top is anchored and provided with slow bonding steel strands uniformly distributed along the peripheral surface at intervals, each slow bonding steel strand extends to the outer peripheral surface of the connected even-numbered reinforcement cage 202 along the top of the odd-numbered reinforcement cage, and extends into the reinforcement cage at the top after converging, extends to the pile foundation hole orifice from the top of the reinforcement cage at the top, and the reinforcement cage and the slow bonding steel strands are fixed along with the casting concrete in the pile foundation hole.
The anchoring structure of the slow bonding steel strand 3 and the steel reinforcement cage 2 is as follows: and the end part of the slow bonding steel strand is provided with an anti-pulling anchoring piece 4, namely after the anti-pulling pile concrete is poured and fixed, the effective anti-pulling of the slow bonding steel strand is realized. The anchor assembly comprises an extrusion anchor 401, a pressure bearing plate 402 and a spiral rib 403, wherein the pressure bearing plate is welded with the spiral rib and sleeved at one end of a slow-bonding steel strand, the end of the slow-bonding steel strand is extruded and fixed to form limit on the pressure bearing plate, the anchor assembly and a steel reinforcement cage are bound and/or welded fixedly through binding wires, an arc-shaped guide protection steel bar 206 for preventing a concrete pouring pipe from extending into the steel reinforcement cage and forming collision with the anchor assembly is welded between the anchor assembly and the steel reinforcement cage, namely, when the concrete pouring pipe extends into the steel reinforcement cage, the anchor assembly cannot form collision with the anchor assembly under the guidance of the guide steel bar, and the stability of the anchor assembly is effectively protected. When the slow-bonding steel strand passes through the reinforcement hoop of the reinforcement cage, the slow-bonding steel strand and the reinforcement hoop can form binding fixation, so that the fixation stability of the slow-bonding steel strand is improved.
The number of the slow bonding steel strands 3 in each odd-numbered section steel reinforcement cage 201 is even, the number of the slow bonding steel strands in each odd-numbered section is equal, and the sum of the number of the slow bonding steel strands in all the odd-numbered sections is the total number of the slow bonding steel strands in the uplift pile. Meanwhile, the slow bonding steel strands in each odd section of reinforcement cage are distributed in a central symmetry mode relative to the central line of the reinforcement cage 2, so that after the whole pouring of the anti-pulling pile is finished, all the slow bonding steel strands are distributed in an annular central symmetry mode relative to the central line of a pile shaft of the anti-pulling pile.
By combining the structure, the concrete construction method of the uplift pile comprises the following steps.
Step one: the required number of slow-bonding steel strands 3 and the steel reinforcement cage 2 are prepared, and the end parts of the slow-bonding steel strands are manufactured to form anchoring parts 4 for pulling resistance.
Step two: hoisting the first odd-numbered section steel reinforcement cage 201 to the pile foundation hole through suspension equipment, extending a required number of slow-bonding steel strands into the odd-numbered section steel reinforcement cage, binding and/or welding the slow-bonding steel strands at positions close to the middle of the steel reinforcement cage through anchoring pieces, placing the steel reinforcement cage into the pile foundation hole through the suspension equipment after the slow-bonding steel strands are fixed, and extending the pile foundation hole from the top of the odd-numbered section steel reinforcement cage and outwards turning the pile foundation hole around to place the slow-bonding steel strands.
Step three: and placing the next even-numbered section reinforcement cage 202 by another suspension device, positioning the slow bonding steel strands of the first odd-numbered section reinforcement cage outside the even-numbered section reinforcement cage, aligning the bottom of the even-numbered section reinforcement cage with the top of the first odd-numbered section reinforcement cage, and welding and fixing the even-numbered section reinforcement cage.
Step four: the next odd-numbered section steel reinforcement cage is placed through the suspension equipment, the bottom of the odd-numbered section steel reinforcement cage is aligned and welded with the top of the previous even-numbered section steel reinforcement cage, a required number of slow-bonding steel strands extend into the odd-numbered section steel reinforcement cage and are bound and/or welded with the steel reinforcement cage through anchoring pieces, the whole steel reinforcement cage is continuously placed into the pile foundation hole by the suspension equipment after the slow-bonding steel strands are fixed, and the slow-bonding steel strands of the odd-numbered section steel reinforcement cage extend out of the pile foundation hole from the top and are placed outwards.
Step five: repeating the operations of the third step and the fourth step, and when binding positions of the slow-bonding steel strands and the reinforcement cage require that all the slow-bonding steel strands vertically stretch along the direction of the pile foundation hole opening, all the slow-bonding steel strands are distributed in an annular center symmetrical mode relative to the circumferential direction of the whole reinforcement cage.
Step six: and hoisting the last section of reinforcement cage through suspension equipment, gathering all the slow-bonding steel strands which are turned outwards relative to the pile hole, penetrating out the last section of reinforcement cage to the pile hole opening, aligning the bottom of the last section of reinforcement cage with the top of the even section of reinforcement cage, welding and fixing, and placing the whole reinforcement cage in the pile foundation hole after fixing.
Step seven: and tensioning and pre-tightening the top ends of the slow-bonding steel strands extending out of the pile foundation holes through tensioning equipment, pouring concrete into the pile foundation holes, tensioning the slow-bonding steel strands until the concrete is solidified to reach the design requirement tensioning force, and removing the tensioning equipment after the slow-bonding steel strands and the concrete are completely bonded and fixed to finish the construction of the slow-bonding prestressed uplift pile.
As shown in fig. 6, the tensioning method in the seventh step specifically includes: above-mentioned stretch-draw base 5 is placed at anti-floating pile top, stretch-draw base circumference is equipped with vertical direction cross-under and slowly bonds bayonet socket 501 of steel strand wires, stretch-draw base circumference's bayonet socket is annular central symmetry and distributes promptly, each slowly bonds steel strand wires and all cross-under anti-skidding gasket 6 and single hole anchor plate 7 when passing the bayonet socket to two slowly bond steel strand wires of central symmetry distribution are a set of, stretch-draw simultaneously two slowly bond steel strand wires of every group through the stretch-draw equipment, insert clamping piece 8 through single Kong Maoban in after the stretch-draw and form the locking fixed to slowly bond steel strand wires.
The above description is intended to illustrate the technical means of the present invention, and not to limit the technical scope of the present invention. Obvious modifications or substitutions by one with ordinary skill in the art are within the scope of the present invention as defined by the appended claims.
Claims (10)
1. The construction structure of the anti-pulling pile (1) comprises pile foundation holes, a steel reinforcement cage (2) and anti-pulling steel strands (3), wherein all the anti-pulling steel strands are distributed in an annular central symmetry mode relative to the central line of a pile shaft of the anti-pulling pile; the method is characterized in that: a plurality of sections of steel reinforcement cages (2) which are vertically aligned and welded and fixed are arranged in the pile foundation hole from bottom to top, vertical slow bonding steel strands (3) which are uniformly distributed at intervals along the peripheral surface are anchored on the inner peripheral surface of an odd section of steel reinforcement cage (201) which is arranged from bottom to top except for the steel reinforcement cage at the top, the number of the slow bonding steel strands is even, the number of the slow bonding steel strands in each odd section is equal, and the sum of the number of the slow bonding steel strands in all odd sections is the total number of the slow bonding steel strands in the anti-pulling pile (1); the slow bonding steel strands in each odd-numbered section steel reinforcement cage extend to the outer peripheral surface of the connected even-numbered section steel reinforcement cage (202) along the tops of the odd-numbered section steel reinforcement cages, and extend into the steel reinforcement cage at the top after converging, extend to the pile foundation hole opening from the tops of the steel reinforcement cages at the top, and the steel reinforcement cages and the slow bonding steel strands are fixed along with the casting concrete in the pile foundation hole.
2. The construction structure of the slow-bonding prestress uplift pile according to claim 1, wherein the end part of the slow-bonding steel strand (3) is anchored with the steel bar cage through an anchor (4) for uplift, and the anchor for the slow-bonding steel strand forms an uplift structure after being poured and fixed with concrete.
3. The construction structure of the slow-bonding prestressed uplift pile according to claim 2, characterized in that the anchoring member (4) comprises an extrusion anchor (401), a bearing plate (402) and a spiral rib (403), the bearing plate is welded with the spiral rib and sleeved at one end of the slow-bonding steel strand (3), and the end of the slow-bonding steel strand is extruded and fixed to form limit on the bearing plate by the extrusion anchor.
4. A construction structure of a slow-bonding prestressed uplift pile according to claim 3, characterized in that the anchoring piece (4) of the slow-bonding steel strand (3) is fixed with the steel reinforcement cage (2) through binding and/or welding, and a guide steel bar (206) for preventing the concrete pouring tube from extending into the steel reinforcement cage to collide with the anchoring piece is welded between the anchoring piece and the steel reinforcement cage.
5. The construction structure of the slow-bonding prestressed uplift pile according to claim 1, characterized in that the slow-bonding steel strands (3) in the odd-numbered section steel reinforcement cage (201) are distributed in a central symmetry manner relative to the central line of the steel reinforcement cage (2).
6. The construction structure of the slow-bonding prestressed uplift pile according to claim 1, characterized in that reinforcement hoops (205) are fixedly arranged at the positions of the reinforcement cage (2) in anchoring connection with the slow-bonding steel strands (3) and/or the positions of the reinforcement cage close to two ends, and the positions of the slow-bonding steel strands passing through the reinforcement hoops are fixedly bound.
7. The construction structure of the slow bonding prestress uplift pile according to claim 6, characterized in that annular ribs (2051) distributed in an annular interval array are arranged on the inner ring of the reinforcement hoop (205).
8. A construction method of a construction structure of a slow-bonding prestressed uplift pile as claimed in claim 1, characterized in that the construction method comprises the following construction steps:
firstly, manufacturing the end part of the slow bonding steel strand (3) to form the anchoring piece (4) for resisting pulling;
hoisting the first odd-numbered section steel reinforcement cage (201) to the pile foundation hole through suspension equipment, extending a required number of slow-bonding steel strands into the odd-numbered section steel reinforcement cage, binding and/or welding the slow-bonding steel strands with the steel reinforcement cage through anchoring pieces (4), and placing the steel reinforcement cage into the pile foundation hole through the suspension equipment after the slow-bonding steel strands are fixed;
thirdly, placing the next even-numbered section of reinforcement cage (202) through suspension equipment, enabling slow-bonding steel strands of the odd-numbered section of reinforcement cage to extend out of the reinforcement cage from the top of the reinforcement cage, aligning the bottom of the even-numbered section of reinforcement cage with the top of the first odd-numbered section of reinforcement cage, and welding and fixing the even-numbered section of reinforcement cage;
fourthly, placing the next odd-numbered section of reinforcement cage through suspension equipment, aligning, welding and fixing the bottom of the odd-numbered section of reinforcement cage with the top of the previous even-numbered section of reinforcement cage, enabling a required number of slow-bonding steel strands to extend into the odd-numbered section of reinforcement cage, binding and/or welding and fixing the slow-bonding steel strands with the reinforcement cage through anchoring pieces, enabling the slow-bonding steel strands to extend out of the reinforcement cage from the top of the odd-numbered section of reinforcement cage after being fixed, and enabling the whole reinforcement cage to be continuously lowered into a pile foundation hole through the suspension equipment;
repeating the operations of the third step and the fourth step, wherein all the slow bonding steel strands extend out of the steel reinforcement cage and are distributed symmetrically in an annular center relative to the center line of the whole steel reinforcement cage;
hoisting the last section of reinforcement cage through suspension equipment, gathering all the slow-bonding steel strands, penetrating out the last section of reinforcement cage to the pile foundation hole opening, aligning the bottom of the last section of reinforcement cage with the top of the even section of reinforcement cage, welding and fixing, and placing the whole reinforcement cage into a pile foundation hole in place after fixing;
and seventh, tensioning and pre-tightening the top ends of the slow-bonding steel strands extending out of the pile foundation holes, pouring concrete into the pile foundation holes, and tensioning the slow-bonding steel strands to reach the tension required by design after the concrete is solidified, thereby completing the construction of the slow-bonding prestressed uplift pile.
9. The construction method of the construction structure of the slow-bonding prestressed uplift pile according to claim 8, characterized in that after anchoring and fixing the anchoring piece (4) of the slow-bonding steel strand (3) in the odd-numbered section steel reinforcement cage (201), a guide protection steel bar (206) for preventing collision with the anchoring piece when the concrete pouring pipe stretches into the steel reinforcement cage (2) is welded between the anchoring piece and the steel reinforcement cage (2).
10. The construction method of the slow-bonding prestressed uplift pile construction structure according to claim 8, characterized in that the tensioning method in the step seven is as follows: the anti-pulling pile is characterized in that a tensioning base (5) is placed at the top of the anti-pulling pile (1), bayonets (501) of vertical guide cross-connected slow-bonding steel strands (3) are circumferentially arranged on the tensioning base, namely, the bayonets in the circumferential direction of the tensioning base are distributed in an annular central symmetry mode, each slow-bonding steel strand penetrates through a bayonet and is simultaneously connected with an anti-slip gasket (6) and a single-hole anchor plate (7) in a cross mode, two slow-bonding steel strands distributed in the central symmetry mode are used as a group, the two slow-bonding steel strands in each group are simultaneously tensioned through tensioning equipment, and after tensioning, locking fixation is formed on the slow-bonding steel strands through clamping pieces (8) in the single-hole anchor plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410164158.6A CN117868106A (en) | 2024-02-05 | 2024-02-05 | Construction structure and construction method of slow-bonding prestressed uplift pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410164158.6A CN117868106A (en) | 2024-02-05 | 2024-02-05 | Construction structure and construction method of slow-bonding prestressed uplift pile |
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