CN220414205U - Prefabricated prestressing force pressure formula anti-floating pile - Google Patents
Prefabricated prestressing force pressure formula anti-floating pile Download PDFInfo
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- CN220414205U CN220414205U CN202320114740.2U CN202320114740U CN220414205U CN 220414205 U CN220414205 U CN 220414205U CN 202320114740 U CN202320114740 U CN 202320114740U CN 220414205 U CN220414205 U CN 220414205U
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- 238000007667 floating Methods 0.000 title description 3
- 230000002787 reinforcement Effects 0.000 claims abstract description 100
- 238000004873 anchoring Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 239000011178 precast concrete Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 8
- 239000011513 prestressed concrete Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 14
- 210000002435 tendon Anatomy 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 9
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a prefabricated prestress pressure type uplift pile, which comprises the following components: the pile body is pre-stressed by a post-tensioning method, the pile body is pre-stressed in a factory after being processed, the pile body is anchored in the pre-stressed pile body through the pile top and pile bottom anchoring devices, and the non-pre-stressed tendons are arranged in parallel. The utility model changes the working state and mechanical property of the traditional anti-pulling pile, the pile bottom bears the tension load, the pile body concrete is pressed and radially expanded, the anti-pulling force of the pile per unit length is improved, the pile length can be reduced, and the anti-pulling bearing capacity is improved. The prestressed reinforcement pile top anchoring device can realize post-tensioned reinforcement anchoring, and can normally transmit tension load when the tension load is larger than a locking value. The utility model adopts factory prefabrication method, is convenient for site construction and easy to ensure construction quality.
Description
Technical Field
The utility model belongs to the technical field of civil engineering, and particularly relates to a prefabricated prestressed pressure type uplift pile.
Background
The uplift pile is a pile driven for counteracting the uplift force generated by the groundwater structure, and is widely applied to projects such as the uplift resistance of large-scale basements, the uplift resistance of high-rise buildings, the uplift resistance of offshore wharf platforms, anchor pile foundations of suspension bridges and cable-stayed bridges, pile foundations of large-scale ship dock floors, anchor pile foundations in static load test piles and the like.
The anti-pulling pile is commonly used as a precast pile and a cast-in-situ pile. The prior prefabricated uplift pile is mainly characterized in that prestressing force is applied to main ribs through a pretensioning method, the main ribs are in a full-length bonding state, the main ribs are mainly aimed at enabling pile body concrete to be always kept in a pressed state under a working state, pile body cracks are reduced, the pile body is still in a top tension characteristic under the working state, stress concentration exists between the pile top and surrounding rock-soil body side friction resistance under the tensile working state, pile side friction resistance peak values are increased along with load to gradually move downwards, pile side friction resistance is unevenly distributed along the pile body, and the uplift efficiency is low.
For the pressure type anti-pulling bored concrete pile, the tensile load can be transmitted to the pile bottom, so that the pile anti-pulling efficiency is better than that of the tensile type anti-pulling pile, but the conventional method is to apply prestress to the prestressed longitudinal ribs of the pile body part after the pile body concrete strength meets the design requirement on the engineering site, and anchor the pile at two ends. The prestress rib functions are divided into two types, one prestress rib is not anchored into a structural bottom plate and does not participate in the pulling-resistant work of a pile body, pulling-resistant force born by the pulling-resistant pile is borne by the pile body non-prestress rib, and the prestress rib adopting a post-tensioning method only plays roles in keeping a pile body in a pressed state and reducing the occurrence of pile body cracks; the other is to use a prestressed steel strand as a prestressed tendon, the prestressed tendon is anchored into a structural bottom plate after post-tensioning and bears a tensile load together with a non-prestressed tendon, a clamping piece anchorage is generally adopted as an anchorage, the type of anchorage can ensure that the anchorage is locked according to design requirements during post-tensioning and works normally when the tensile load of a pulling pile is smaller than a tensioning value, but under special conditions, when the tensile load of the pulling pile exceeds the locking value, the clamping piece anchorage can loose and fail, and is difficult to recover to the original position and continue to function normally after the tensile value is reduced, so that a certain risk exists. In addition, the pressure type anti-pulling cast-in-place pile is required to be manufactured, installed and stretched on site, the operation method is complex, the on-site construction difficulty is high, the requirements on the construction level are high, the construction quality is difficult to guarantee, and the reliability is not strong.
Disclosure of Invention
According to the technical problem, the prefabricated prestressed pressure type uplift pile is provided, the prefabricated method is adopted, the whole length of the prestressed reinforcement is unbonded by the uplift main reinforcement, the prestressed is applied to the factory after the pile body is processed, the pile is anchored at the two ends of the pile, the pile top is firstly subjected to tensile load when the traditional tensile type uplift pile works and is firstly subjected to tensile load when the pile bottom is firstly subjected to tensile load, the pile body concrete of the uplift pile is converted from 'pull shrinkage' of the traditional tensile type pile to 'compression expansion', the uplift force of the uplift pile in unit length can be improved, and then the pile length can be reduced and the uplift bearing capacity can be improved; when the pile top of the prestressed tendon is anchored, a special vertical movable anchor is adopted, so that the prestressed tendon can be locked at a preset tensioning value, the tensioning load can still be normally transmitted to the pile bottom according to the design intention under special conditions when the tension load exceeds the tensioning locking value, the working state is kept, and when the tension load is reduced to be below the tensioning value, the movable anchor is reset, the original preset locking value of the prestressed tendon is continuously kept, and the normal working state is restored; the working state of the pile body concrete is a pressed state, the pile body reinforcement is not required to be carried out according to the anti-cracking requirement, and the consumption of the reinforcement is saved; factory prefabrication is adopted, site construction is convenient, and site construction quality can be guaranteed.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a prefabricated prestressed pressure-type uplift pile comprising: the pile comprises a precast concrete pile body, prestressed reinforcement, a sheath, stirrups, non-prestressed reinforcement, a prestressed reinforcement pile top anchoring device and a prestressed reinforcement pile bottom anchoring device; the prestressed reinforcement pile top anchoring device and the prestressed reinforcement pile bottom anchoring device are respectively arranged at the pile top and the pile bottom, the prestressed reinforcement is fixed in the precast concrete pile body, the stirrups encircle the outer sides of the prestressed reinforcement and the non-prestressed reinforcement, and the non-prestressed reinforcement and the prestressed reinforcement are arranged in parallel.
The prestressed reinforcement is provided with a sheath outside concentrically, the sheath is a hollow sleeve, and lubricating grease is smeared in the sheath.
The whole length of the prestressed reinforcement is an unbonded section, and the prestressing force is applied by a post-tensioning method; the prestressed reinforcement is fixed in the precast concrete pile body through the prestressed reinforcement pile top anchoring device and the prestressed reinforcement pile bottom anchoring device.
The prestress rib pile top anchoring device comprises a pile top anchor plate, a sealing cover, a movable anchor device and pile top connecting steel bars; and an anchor hole is reserved at the top of the pile top anchor plate, a sealing cover is arranged at the top of the anchor hole, the distance between the top of the movable anchor and the sealing cover is not less than 20mm, and the anchor hole and the movable anchor are filled with anti-corrosion grease.
The prestressed reinforcement pile bottom anchoring device comprises a prestressed reinforcement pile bottom anchoring anchor and a pile bottom anchor plate, wherein the bottom of the prestressed reinforcement is anchored in the prestressed reinforcement pile bottom anchoring anchor, and the prestressed reinforcement pile bottom anchoring anchor is positioned at the lower part of the pile bottom anchor plate.
Further, the prestressed tendon pile top anchorage device is a special vertically movable anchorage device.
Further, the top of the prestressed tendon is anchored at the lower part of the movable anchorage device, the pile top connecting reinforcing steel bar is connected at the upper part of the movable anchorage device, and the connecting method can be one of extrusion or screw connection modes.
Further, the prestressed reinforcement adopts one of a spiral groove steel bar, a prestressed steel strand or a finish-rolled twisted steel for low-relaxation prestressed concrete.
Further, the non-prestressed reinforcement is one of a common screw thread reinforcement, a screw groove steel bar for low-relaxation prestressed concrete or a finish-rolled screw thread reinforcement.
Further, the cross section of the pile body of the prefabricated prestressed pressure type anti-pulling pile prefabricated concrete pile body is circular, rectangular or polygonal.
Further, the pile body of the prefabricated prestressed pressure type anti-pulling pile prefabricated concrete pile is solid or hollow.
Further, the prefabricated prestressed pressure type anti-pulling pile is formed by a prefabricated concrete pile body in a cylindrical shape, a prismatic shape, a bamboo joint shape, a local expansion shape or a frustum shape.
The utility model has the beneficial technical effects that:
(1) By adopting the technical scheme, the prestressed main reinforcements are fixed at the two ends of the pile through the pile top anchoring device and the pile bottom anchoring device, the elastic elongation of the main reinforcements can be reduced by applying prestressing force to the main reinforcements, and the pile top connecting reinforcements are reliably connected with the prestressed reinforcements through the anchors and then anchored into the building bottom plate; (2) By adopting the technical scheme, the pile top of the prestressed tendon is anchored by adopting the special vertical movable anchorage device, so that the prestressed tendon can be locked at a preset tensioning value, the tensioning load can still be normally transmitted to the pile bottom according to the design intention under special conditions when the tension load exceeds the tensioning locking value, the working state is kept, and the movable anchorage device is reset and continuously keeps the original preset locking value of the prestressed tendon and returns to the normal working state when the tension load is reduced below the tensioning value; (3) By adopting the technical scheme, the jacket is adopted outside the prestressed reinforcement, the whole length is an unbonded section, the main reinforcement directly transmits force to the pile bottom after being pulled, the pile body concrete of the anti-pulling pile is always in a pressed state, the reinforcement is not controlled by concrete crack resistance, the pile body reinforcement material is saved, and the economic benefit is improved; (4) By adopting the technical scheme, the pile body concrete of the anti-pulling pile has the mechanical property of pressing expansion in the working state, so that the friction force between the anti-pulling pile and the surrounding soil of the pile can be increased, the pile length can be reduced, the anti-pulling bearing capacity can be improved, and the economic benefit can be improved under the same condition; (5) By adopting the technical scheme, the prefabricated prestress pressure type anti-pulling pile is prefabricated, site construction is convenient, construction quality can be guaranteed, and design intent is realized.
Drawings
Fig. 1: the utility model provides a prefabricated prestress pressure type uplift pile schematic diagram;
fig. 2: the utility model provides a schematic cross section of a prefabricated pressure type anti-pulling pipe pile;
fig. 3: the utility model provides a schematic cross section of a prefabricated pressure type anti-pulling square pile;
fig. 4: the utility model provides a schematic diagram of a pile top anchoring method of a prestressed tendon of a prefabricated pressure type anti-pulling pile;
fig. 5: the utility model provides a pile bottom anchoring method schematic diagram of a prestressed reinforcement of a prefabricated pressure type anti-pulling pile;
in the figure: 1-precast concrete pile body, 2-prestressed reinforcement, 3-sheath, 4-stirrup, 5-non-prestressed reinforcement, 6-prestressed reinforcement pile top anchoring device, 7-prestressed reinforcement pile bottom anchoring device, 8-sealing cover, 9-anticorrosion grease, 10-movable anchorage, 11-pile top anchor plate, 12-anchoring hole, 13-pile top connecting reinforcement, 14-prestressed reinforcement pile bottom anchoring anchorage and 15-pile bottom anchor plate.
Description of the preferred embodiments 1
The following examples further illustrate the technical aspects of the present utility model, but are not intended to limit the scope of the present utility model.
The utility model will be described in further detail with reference to the accompanying drawings 1, in conjunction with the examples. The utility model provides a prefabricated prestressing force pressure formula uplift pile which specifically includes: the precast concrete pile comprises a precast concrete pile body 1, prestressed steel bars 2, a sheath 3, stirrups 4, non-prestressed steel bars 5, a prestressed steel bar pile top anchoring device 6 and a prestressed steel bar pile bottom anchoring device 7.
The prestressed reinforcement 2 is evenly arranged in the precast concrete pile body 1, the jacket 3 is concentrically arranged outside the prestressed reinforcement 2, the jacket 3 is a hollow sleeve, and lubricating grease is smeared in the jacket 3.
The stirrups 4 are arranged outside the non-prestressed reinforcement 5 and the prestressed reinforcement 2; the prestressed reinforcement pile top anchoring device 6 and the prestressed reinforcement pile bottom anchoring device 7 are respectively arranged at the pile top and the pile bottom; the non-prestressed reinforcement 5 is arranged in parallel with the prestressed reinforcement 2.
The prestress steel bar 2 applies prestress through a post-tensioning method; the prestressed reinforcement 2 is fixed in the precast concrete pile body 1 through the prestressed reinforcement pile top anchoring device 6 and the prestressed reinforcement pile bottom anchoring device 7.
Further, the pre-stressed steel bar 2 adopts one of a spiral groove steel bar, a pre-stressed steel strand or a finish-rolled twisted steel bar for low-relaxation pre-stressed concrete.
Further, the non-prestressed reinforcement 5 is one of a common screw-thread reinforcement, a screw-grooved steel bar for low-relaxation prestressed concrete, or a finish-rolled screw-thread reinforcement.
Further, as shown in fig. 2 and 3, the cross section of the precast prestressed pressure type pile body 1 is circular, rectangular or polygonal.
Further, as shown in fig. 2 and 3, the prefabricated prestressed pressure type anti-pulling pile prefabricated concrete pile body 1 is hollow or solid.
Further, the prefabricated prestressed pressure type anti-pulling pile prefabricated concrete pile body 1 is cylindrical, prismatic, bamboo joint type, local expansion type or frustum type.
Description of the preferred embodiments 2
The following examples further illustrate the technical aspects of the present utility model, but are not intended to limit the scope of the present utility model.
The utility model will be described in further detail with reference to the accompanying drawings, fig. 4 and 5. The utility model provides a prefabricated prestressing force pressure formula anti-floating pile prestressing tendons stake top, pile bottom anchor which specifically includes: the pile comprises prestressed reinforcement 2, prestressed reinforcement pile top anchoring devices 6, prestressed reinforcement pile bottom anchoring devices 7, sealing covers 8, anti-corrosion grease 9, movable anchors 10, pile top anchor plates 11, anchoring holes 12, pile top connecting reinforcement 13, prestressed reinforcement pile bottom anchoring anchors 14 and pile bottom anchor plates 15.
The prestress rib pile top anchoring device 6 comprises a pile top anchor plate 11, a sealing cover 8, a movable anchor 10 and a pile top connecting steel bar 13; the top of the pile top anchor plate 11 is reserved with an anchor hole 12, the top of the anchor hole 12 is provided with a sealing cover 8, the top of the prestressed reinforcement 2 is anchored at the lower part of the movable anchor 10, the pile top connecting reinforcement 13 is connected at the upper part of the movable anchor 10, the connecting method is one of extrusion or screw connection modes, the distance between the top of the movable anchor 10 and the sealing cover 8 is not less than 20mm, and the space between the anchor hole 12 and the movable anchor 10 is filled with anti-corrosion grease 9.
The prestressed reinforcement pile bottom anchoring device 7 comprises a prestressed reinforcement pile bottom anchoring anchor 14 and a pile bottom anchor plate 15, and the bottom of the prestressed reinforcement 2 is anchored in the prestressed reinforcement pile bottom anchoring anchor 14 below the pile bottom anchor plate 15.
The above-described embodiments are not intended to limit the scope of the present application, and the present utility model is not limited to the above-described embodiments, and therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. The utility model provides a prefabricated prestressing force pressure formula uplift pile which characterized in that: the pile comprises a precast concrete pile body (1), prestressed reinforcement (2), a sheath (3), stirrups (4), non-prestressed reinforcement (5), a prestressed reinforcement pile top anchoring device (6) and a prestressed reinforcement pile bottom anchoring device (7); the prestressed reinforcement pile top anchoring device (6) and the prestressed reinforcement pile bottom anchoring device (7) are respectively arranged at the pile top and the pile bottom, the prestressed reinforcement (2) is fixed in the precast concrete pile body (1), the stirrups (4) encircle the outer sides of the prestressed reinforcement (2) and the non-prestressed reinforcement (5), and the non-prestressed reinforcement (5) and the prestressed reinforcement (2) are arranged in parallel.
2. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the prestress rib pile top anchoring device (6) comprises a pile top anchor plate (11), a sealing cover (8), a movable anchor (10) and a pile top connecting steel bar (13); an anchor hole (12) is reserved at the top of the pile top anchor plate (11), a sealing cover (8) is arranged at the top of the anchor hole (12), the top of the prestressed reinforcement (2) is anchored at the lower part of the movable anchor (10), the pile top connecting reinforcement (13) is connected to the upper part of the movable anchor (10), the connecting method is one of extrusion or screw connection modes, the interval between the top of the movable anchor (10) and the sealing cover (8) is not less than 20mm, and anti-corrosion grease (9) is filled between the anchor hole (12) and the movable anchor (10).
3. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the prestressed reinforcement pile bottom anchoring device (7) comprises a prestressed reinforcement pile bottom anchoring anchor (14) and a pile bottom anchor plate (15), the bottom of the prestressed reinforcement (2) is anchored in the prestressed reinforcement pile bottom anchoring anchor (14), and the prestressed reinforcement pile bottom anchoring anchor (14) is positioned at the lower part of the pile bottom anchor plate (15).
4. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the prestressed reinforcement (2) is evenly arranged in the precast concrete pile body (1), the jacket (3) is concentrically arranged outside the prestressed reinforcement (2), the jacket (3) is a hollow sleeve, and lubricating grease is smeared in the jacket (3).
5. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the full length of the prestressed reinforcement (2) is an unbonded section, a post-tensioning method is adopted, prestress is applied to a factory after the pile body is processed, and the prestressed reinforcement is anchored at two ends of the precast concrete pile body (1) through the prestressed reinforcement pile top anchoring device (6) and the prestressed reinforcement pile bottom anchoring device (7).
6. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the prestressed reinforcement (2) is one of a spiral groove steel bar, a prestressed steel strand or a finish rolling twisted steel for low-relaxation prestressed concrete.
7. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the cross section of the precast concrete pile body (1) is round, rectangular or polygonal.
8. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the precast concrete pile body (1) is solid or hollow.
9. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the precast concrete pile body (1) is cylindrical, prismatic, bamboo-shaped, partially expanded or frustum-shaped.
10. A prefabricated prestressed pressure type uplift pile according to claim 1, characterized in that: the non-prestressed reinforcement (5) is one of a common screw-thread reinforcement, a screw-channel steel bar for low-relaxation prestressed concrete or a finish-rolled screw-thread reinforcement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320114740.2U CN220414205U (en) | 2023-01-17 | 2023-01-17 | Prefabricated prestressing force pressure formula anti-floating pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320114740.2U CN220414205U (en) | 2023-01-17 | 2023-01-17 | Prefabricated prestressing force pressure formula anti-floating pile |
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| CN220414205U true CN220414205U (en) | 2024-01-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116716870A (en) * | 2023-01-17 | 2023-09-08 | 北京中岩大地科技股份有限公司 | Prefabricated prestressing force pressure formula anti-floating pile |
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- 2023-01-17 CN CN202320114740.2U patent/CN220414205U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116716870A (en) * | 2023-01-17 | 2023-09-08 | 北京中岩大地科技股份有限公司 | Prefabricated prestressing force pressure formula anti-floating pile |
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