CN209941674U

CN209941674U - Concrete uplift pile with bonding prestress

Info

Publication number: CN209941674U
Application number: CN201920654798.XU
Authority: CN
Inventors: 方永安; 王榜正; 蒋国灼
Original assignee: Guangdong Huafang Engineering Design Co Ltd
Current assignee: Guangdong Huafang Engineering Design Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-01-14
Anticipated expiration: 2029-05-09

Abstract

The utility model relates to a concrete uplift pile with bonding prestressing force, including the slip casting pipe, the steel casing pipe, the prestressing force steel strand bundle, the stiff end, stretch-draw end, the muscle is indulged to the pile body, the pile body stirrup, the cushion cap, wherein the bottom of slip casting pipe is the stiff end, the top of slip casting pipe is the stretch-draw end, and slip casting pipe welded fastening is in the outside of steel casing pipe, the slip casting pipe is provided with the slip casting mouth, steel casing pipe welded fastening is on the pile body stirrup, pile body stirrup ligature is fixed on the muscle is indulged to the pile body, the lower extreme welding anchor of prestressing force steel strand bundle is at the stiff end, the terminal surface of cushion cap is up worn out along the steel casing pipe in the upper end of prestressing force steel strand bundle, and reserve the length of stretch-draw. The utility model discloses according to the steerable different pile shaft crack width of environment classification that the pile foundation is located to save ordinary reinforcing bar. The utility model discloses economic benefits is obvious, is a design benefit, convenient and practical's concrete uplift pile that has bonding prestressing force.

Description

Concrete uplift pile with bonding prestress

Technical Field

The utility model relates to a concrete uplift pile, especially a concrete uplift pile who has bonding prestressing force belongs to the innovation technique of the concrete uplift pile who has bonding prestressing force.

Background

Modern city development makes the building more and more intensive, and the number of stories under the building is more and more, and is higher and higher to the not many stories of skirt building or the basement resistance to plucking of no land portion of skirt building portion, and single stake resistance to plucking is increasing. Many times, the uplift resistance born by single piles of basements with 3 or more than 3 layers reaches more than 3000KN-8000KN, and at this time, a pile body is often required to be provided with a large amount of common steel bars according to the standard for controlling the cracks of the pile body; sometimes, a single pile body is fully distributed with reinforcing steel bars (the diameter of the reinforcing steel bars is 40 mm) and cannot meet the requirement, and multiple piles are required for uplift resistance; or a large number of anti-floating anchor rods are added under certain conditions (the anchor rods are not suitable under certain conditions, and the requirement of durability higher than the specification is met even if the design of the anchor rods can be adopted), and the like. Under the environment conditions (coastal buildings, coastal buildings and the like) that underground water and soil have moderate corrosivity, the crack control width of the uplift pile of civil and industrial buildings is more strict, and the design by adopting the common reinforced concrete cast-in-place pile is more and more difficult.

Disclosure of Invention

An object of the utility model is to provide a concrete uplift pile that has bonding prestressing force in view of above-mentioned problem. The utility model discloses according to the steerable different pile shaft crack width of environment classification that the pile foundation is located to save ordinary reinforcing bar. The utility model discloses economic benefits is obvious, is a design benefit, convenient and practical's concrete uplift pile that has bonding prestressing force.

The technical scheme of the utility model is that: the utility model discloses a concrete uplift pile that has bonding prestressing force, including the slip casting pipe, the steel casing pipe, prestressing force steel strand bundle, the stiff end, stretch-draw end, the muscle is indulged to the pile body, the pile body stirrup, the cushion cap, wherein the bottom of slip casting pipe is the stiff end, the top of slip casting pipe is the stretch-draw end, and slip casting pipe welded fastening is in the outside of steel casing pipe, the slip casting pipe is provided with the slip casting mouth, steel casing pipe welded fastening is on the pile body stirrup, pile body stirrup ligature is fixed on the pile body is indulged the muscle, the lower extreme welding anchor of prestressing force steel strand bundle is at the stiff end, the terminal surface of cushion cap is up worn out along the steel casing pipe in the upper end of prestressing force steel strand bundle, and reserve the length of stretch-draw.

The utility model discloses replace partial ordinary reinforcing bar with having bonding prestress wire at reinforced concrete major diameter socketed uplift pile to adopt the post-tensioning technique to prestress wire. The utility model discloses according to the steerable different pile shaft crack width of environment classification that the pile foundation is located to save ordinary reinforcing bar. The utility model not only solves the problems of excessive common longitudinal bars, overhigh manufacturing cost and difficult construction when the uplift resistance borne by the uplift pile is larger than 2000 KN; the utility model discloses also solve the pile body crack control problem of uplift pile under ordinary soil and water environment or corrosive water soil environment (coastal environment), the durability problem of uplift pile under the indirect coastal environment of can solving. The utility model discloses economic benefits is obvious, is a design benefit, convenient and practical's concrete uplift pile that has bonding prestressing force.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cut-away view of the uplift pile A-A of the utility model;

FIG. 3 is an enlarged view of the structure of the fixing end of the present invention;

FIG. 4 is an enlarged view of the structure of the stretching end of the present invention;

fig. 5 is a top view of the tension end of the present invention.

Detailed Description

Example (b):

the utility model discloses a structural schematic diagram is shown in fig. 1, the utility model discloses a concrete uplift pile that has bonding prestressing force, including slip casting pipe 1, steel casing pipe 2, prestressing force steel strand bundle 3, stiff end 4, stretch-draw end 5, pile body indulges muscle 6, pile body stirrup 7, cushion cap 10, wherein the bottom of slip casting pipe 1 is stiff end 4, the top of slip casting pipe 1 is stretch-draw end 5, and slip casting pipe 1 welded fastening is in steel casing pipe 2's the outside, slip casting pipe 1 is provided with the slip casting mouth, steel casing pipe 2 welded fastening is on pile body stirrup 7, pile body stirrup 7 ligature is fixed on pile body indulges muscle 6, prestressing force steel strand bundle 3's lower extreme welded anchoring is at stiff end 4, prestressing force steel strand bundle 3's upper end is up along steel casing pipe 2 wears out the terminal surface of cushion cap 10, and reserve the length of stretch-draw. The steel sleeve 2 does not adopt a corrugated pipe but adopts a steel sleeve because the length of the pile body reaches more than dozens of meters under many conditions, and the prestressed sleeve is required to bear the pressure of a water head of dozens of meters in the construction process.

In this embodiment, the outer side of the bottom-sealed steel plate of the steel casing 2 is sealed with an epoxy resin 9.

In the embodiment, the steel sleeve 2 is welded and fixed on the pile body stirrup 7 through the steel bar 8; and the pile body stirrups 7 are bound and fixed on the pile body longitudinal reinforcements 6. The pile body stirrup 7 is bound and fixed on the pile body longitudinal bar 6 by No. 20 galvanized iron wires.

In this embodiment, one end of the prestressed steel strand bundle 3 is welded and anchored to the fixed end 4 by using a steel bar 8.

In this embodiment, the tensioning end 5 includes an anchor plate 12 and a backing plate 13, wherein the backing plate 13 is fixed on the bearing platform 10, the anchor plate 12 is placed on the backing plate 13, and the anchor plate 12 and the backing plate 13 are integrated with the bearing platform 10 through concrete.

In this embodiment, the upper end of the prestressed steel strand bundle 3 passes upward through the opening formed by the bearing platform 10, the backing plate 13, and the anchor plate 12 along the steel casing 2, and is fixed to the anchor plate 12 by the clip 11 after being tensioned by the jack. The backing plate 13 and the anchor plate 12 are perforated according to the number of the prestressed steel strand bundles 3.

In this embodiment, the tensioning end 5 is further provided with a spiral rib 14, and the spiral rib 14 reinforces concrete of the tensioning end 5. The protective layer of the anchor plate 12 of the tensioning end 5 is greater than 50 mm.

In this embodiment, the injection port of the injection pipe 1 is provided 50mm above the bottom sealing surface of the steel sleeve 2. So as to ensure the grouting on the upper surface of the sealing bottom of the steel sleeve 2 and ensure the grouting in the steel sleeve 2.

In this example, the slip casting pipe 1 was a seamless steel pipe having a diameter of 25 × 3. The grouting pipe 1 is fixed to the outer side of the steel sleeve 2 by spot welding. The steel bar 8 is a short steel bar, and the specification of the steel bar 8 is 8@ 600.

In this embodiment, the prestressed steel strand bundle 3 is formed by 1 × 7 strands of bonded steel strands, a plurality of prestressed steel strands form a group to form a bundle, and a plurality of groups of prestressed steel strand bundles 3 are evenly distributed in different steel casings 2. The piles can be bundled by 7-10, and can be divided into 3-4 groups in general, and each pile is uniformly arranged along the periphery of the pile. The strength grade of the pile body concrete adopts C40.

In this embodiment, the spiral rib 14 is generally an HRB 400-grade steel bar. The clip 11 meets the national regulation anchor, clip and connector for prestressed tendons GB/T14370-.

Claims

1. The utility model provides a concrete uplift pile that has bonding prestressing force, its characterized in that is including the slip casting pipe, the steel sleeve, prestressing force steel strand bundle, the stiff end, the tensioning end, pile body longitudinal reinforcement, pile body stirrup, the cushion cap, wherein the bottom of slip casting pipe is the stiff end, the top of slip casting pipe is the tensioning end, and slip casting pipe welded fastening is in the outside of steel sleeve, the slip casting pipe is provided with the slip casting mouth, steel sleeve welded fastening is on pile body stirrup, pile body stirrup ligature is fixed on pile body longitudinal reinforcement, prestressing force steel strand bundle's lower extreme welded anchoring is at the stiff end, prestressing force steel strand bundle's upper end up wears out the terminal surface of cushion cap along the steel sleeve to reserve the length of stretch-draw.

2. The bonded prestressed concrete uplift pile according to claim 1, wherein the outer side of the steel back plate of the steel sleeve is sealed with epoxy resin.

3. The concrete uplift pile with bonding prestress according to claim 1, wherein said steel sleeve is fixed to a pile body stirrup by means of reinforcement welding; and binding and fixing the pile body stirrups on the pile body longitudinal reinforcements.

4. The concrete uplift pile with bonded prestress according to claim 1, wherein one end of the prestressed steel strand bundle is welded and anchored to the fixed end by using a steel bar.

5. The concrete uplift pile with bonding prestress according to claim 1, wherein the tension end comprises an anchor plate, a backing plate and concrete, wherein the backing plate is fixed on the bearing platform, the anchor plate is placed on the backing plate, and the anchor plate and the backing plate are integrated with the bearing platform through the concrete.

6. The concrete uplift pile with bonding prestress according to claim 1, wherein the upper end of the prestressed steel strand is extended upward through the bearing platform along the steel sleeve, and is fixed to the anchor plate by a clip after being tensioned by a jack.

7. The concrete uplift pile with bonded prestress according to claim 5, wherein the tension end is further provided with a spiral rib, and the spiral rib reinforces concrete of the tension end.

8. The concrete uplift pile with bonding prestress according to any one of claims 1 to 7, wherein the grouting port of the grouting pipe is disposed 50mm above the back surface of the steel sleeve.

9. The bonded prestressed concrete uplift pile according to claim 8, wherein the grouting pipe is a seamless steel pipe having a diameter of 25x 3.

10. The concrete uplift pile with cohesive prestress according to claim 9, wherein said grouting pipe is spot-welded to an outer side of the steel sleeve.