CN216920296U

CN216920296U - Post-tensioned prestressed fender post with bonding function

Info

Publication number: CN216920296U
Application number: CN202123074038.8U
Authority: CN
Inventors: 应晓阳; 冯维维; 杨萤; 詹晓波; 王俊; 郭兆明; 吕小欣; 邵友法; 徐海泳; 汪悦
Original assignee: Zhejiang Dadi Survey And Design Co ltd
Current assignee: Zhejiang Dadi Survey And Design Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-07-08
Anticipated expiration: 2031-12-08

Abstract

The application discloses a post-tensioning bonded prestressed fender post, a construction method thereof and a manufacturing method of a steel reinforcement cage structure. The enclosure pile and the construction method thereof can apply the steel strand prestress technology to the enclosure pile, and recover the steel strands in the non-stressed direction, thereby saving the steel consumption; meanwhile, the rigidity of the fender post is improved by utilizing the prestress technology, the integral stability of soil is improved, the deformation and settlement of the surrounding environment of the foundation pit are reduced, and the fender post is simple in structure, convenient to use and high in reliability. The steel reinforcement cage structure comprises a steel reinforcement cage framework, a plurality of U-shaped pipes arranged on the steel reinforcement cage framework and steel strands penetrating through the U-shaped pipes; the steel reinforcement cage framework comprises longitudinal bars and stirrups, the U-shaped pipes are arranged at equal intervals along the inner side of the steel reinforcement cage framework, and steel strands penetrating through the U-shaped pipes are carriers for applying prestress.

Description

Post-tensioned prestressed fender post with bonding function

Technical Field

The utility model relates to the technical field of constructional engineering, in particular to a post-tensioned bonded prestressed fender post.

Background

When a foundation pit is excavated in the construction of constructional engineering, the foundation pit needs to be temporarily supported so as to ensure the safety of the surrounding environment of the foundation pit. When the excavation depth of the foundation pit is large, a retaining and protecting mode is usually a mode of adding a support to a fender pile, wherein the fender pile mainly comprises a cast-in-situ bored pile, a pile in an SMW construction method, an underground continuous wall and the like. When the common cast-in-situ bored pile is adopted, if the excavation depth of the foundation pit is deep, the stress of the fender post is large, and in order to ensure safety, more steel bars need to be configured, and the steel consumption is large. When the foundation pit is excavated, the fender pile deforms under the action of soil pressure, the periphery of the foundation pit also deforms along with the deformation of the fender pile, and the problems of ground cracking, settlement and the like can occur in serious cases.

The steel strand is commonly used in prestressed structural members due to the characteristics of high strength, light weight and the like, and is widely applied in the fields of large-span structures, bridges and the like. Pretensioning prestressing is also commonly used in prefabricated elements, such as prefabricated panels, prefabricated piles, etc. In underground engineering, the steel strand is mainly used in slope engineering and precast piles, and the steel strand is rarely used in fender pile engineering due to complex process.

Therefore, it is necessary to develop a post-tensioned bonded prestressed fender pile, a construction method thereof and a manufacturing method of a reinforcement cage structure to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a post-tensioning bonded prestressed fender post to solve the problems in the prior art. The main purposes of the utility model are: the steel strand prestress technology is used for the fender pile, and the steel consumption is saved. Meanwhile, the rigidity of the fender post is improved by utilizing a prestress technology, the integral stability of soil is improved, and the deformation and settlement of the periphery of the foundation pit are reduced.

In order to achieve the purpose, the utility model provides the following technical scheme:

a post-tensioned bonded prestressed fender post comprises a reinforcement cage structure, wherein the reinforcement cage structure comprises a reinforcement cage framework, a plurality of U-shaped pipes arranged on the reinforcement cage framework and steel strands penetrating through the U-shaped pipes; the steel reinforcement cage framework comprises longitudinal ribs and stirrups, the U-shaped pipes are arranged at equal intervals along the inner side of the steel reinforcement cage framework, and steel strands penetrating through the U-shaped pipes are carriers for applying prestress.

As a further scheme of the utility model: the U-shaped pipe is fixed on the inner side of the reinforcement cage framework and is bent into a U shape at a certain distance from the bottom of the reinforcement cage framework.

As a further scheme of the utility model: a plurality of U type pipes are the equidistant arrangement of horizontal direction, are staggered arrangement to the bottom that is close to the steel reinforcement cage skeleton on the vertical direction, and fix on the steel reinforcement cage skeleton.

As a further scheme of the utility model: the top end of the steel reinforcement cage structure is provided with a crown beam, the crown beam and a plurality of steel reinforcement cage structures are connected together through concrete pouring to form a foundation pit supporting structure, steel strands of the steel reinforcement cage structure penetrate through the crown beam and then are tensioned and anchored, and then grouting and filling are carried out in the U-shaped pipe.

As a further scheme of the utility model: and S2, lowering the steel reinforcement cage structure into the pile hole, filling clear water into the U-shaped pipe, plugging the top end of the U-shaped pipe, taking protective measures, and pouring concrete into the pile body.

Compared with the prior art, the utility model has the beneficial effects that: the steel strand prestress technology is used for the fender pile, steel bars in the stressed direction can be replaced by steel strands with triple strength and one third weight, and steel amount is saved by two modes of recovering the steel strands in the unstressed direction. Meanwhile, a new method for realizing a prestress technology in the fender post is provided, the construction process is simple, the rigidity of the fender post is improved, the integral stability of soil is improved, and the deformation of the periphery of the foundation pit is reduced.

Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the utility model and the accompanying drawings.

Drawings

FIG. 1 is a schematic view of an overall construction of a post-tensioned bonded prestressed fender post according to an embodiment of the present invention;

FIG. 2 is a schematic top view of a post-tensioned bonded prestressed fender post according to an embodiment of the utility model;

FIG. 3 is a schematic cross-sectional view of a U-shaped tube in an embodiment of the utility model;

fig. 4 is a schematic view of the position of the pile top connection in the embodiment of the utility model.

The figures are numbered: the steel reinforcement cage structure comprises a steel reinforcement cage structure 1, a steel reinforcement cage framework 11, stirrups 111, longitudinal bars 112, U-shaped pipes 12, steel strands 13, pile holes 2, a stress area 3, a pressure-bearing steel plate 4 and a crown beam 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiment of the utility model, a post-tensioning bonded prestressed fender post is shown in fig. 1-4 and comprises a reinforcement cage structure 1, wherein the reinforcement cage structure 1 comprises a reinforcement cage framework 11, a plurality of U-shaped pipes 12 arranged on the reinforcement cage framework 11 and steel strands 13 penetrating through the U-shaped pipes 12; the reinforcement cage framework 11 comprises longitudinal ribs 112 and stirrups 111, the U-shaped pipes 12 are arranged along the inner side of the reinforcement cage framework 11 at equal intervals, and steel strands 13 penetrating through the U-shaped pipes 12 are carriers for applying prestress.

The design value of the tensile strength of the HRB400 steel bar is 360MPa, the design value of the tensile strength of the common steel strand 13 is 1320MPa, and the design value of the tensile strength of the steel strand 13 is about 3.67 times of the design value of the tensile strength of the HRB400 steel bar. Under the condition of the same strength, the steel consumption of the steel strand 13 is less than one third of that of the HRB400 steel bar. Compared with the traditional mode that steel bars are adopted, in the embodiment of the utility model, the stressed direction steel strand 13 is used for replacing the steel bars, and the unstressed direction steel strand can be pulled out and put into the next pile for use, so that the steel consumption can be saved by more than one half.

The post-tensioning method that this embodiment provided has bonding prestressing force fender pile, and the pile head is above ground, and convenient stretch-draw adopts prestressing steel strand wires 13 as the main muscle, and the intensity of steel strand wires 13 can the full play effect, improves pile body quality, reduces the pile crack, and increase pile body rigidity, reduces the peripheral deformation of foundation ditch. During the construction, do not have the requirement to the direction of placing of steel reinforcement cage structure 1, can place at will according to the facility of construction, wait that pile body concrete fills to accomplish and have certain intensity after, will not receive the force direction steel strand wires again and retrieve and drop into next stake and use, reuse, green.

In the embodiment, referring to fig. 1-3, the U-shaped tube 12 is fixed inside the reinforcement cage 11 and bent into a U-shape at a distance from the bottom of the reinforcement cage 11. The U-shaped tube 12 extends from one side of the top of the reinforcement cage 11 to the bottom, bends into a U-shape at a distance (e.g., about 2m) from the bottom of the reinforcement cage 11 and returns to the top of the reinforcement cage 11 along the other side of the reinforcement cage 11. Because this U type pipe 12 need not set up the ground tackle in the bottom, avoid being difficult to slip casting and slip casting quality unreliable under the closed condition of pipe bottom to and because of the intraductal earth debris that falls into of pipe bottom closure is difficult to clear away, thereby influences the problem of slip casting quality.

In this embodiment, referring to fig. 1 to 3, a plurality of U-shaped tubes 12 are arranged at equal intervals in the horizontal direction, are arranged in a staggered manner in the vertical direction toward the bottom end close to the reinforcement cage framework 11, and are fixed on the reinforcement cage framework 11. The U-shaped pipes 12 are fixed on the reinforcement cage framework 11 in a staggered manner near the lower end of the reinforcement cage framework 11 in the horizontal direction at equal intervals and in the vertical direction. In the vertical direction, for example, the first U-shaped pipe 12 passes through the pile top to be close to the pile bottom and then turns back, and the second U-shaped pipe 12 passes through the first U-shaped pipe 12 and turns back about 1 m above the pipe bottom. The U-shaped tubes 12 are offset at equal intervals in the plane direction. The U-shaped pipes 12 are staggered in order in the horizontal direction and the vertical direction, do not interfere with each other, and respectively play a role in prestressing.

In this embodiment, referring to fig. 1 to 4, a top beam 5 is disposed at the top end of a steel reinforcement cage structure 1, the top beam 5 is connected with a plurality of steel reinforcement cage structures 1 through concrete pouring to form a foundation pit supporting structure, wherein steel strands 13 of the steel reinforcement cage structures 1 penetrate through the top beam 5 and then are tensioned and anchored, and then the U-shaped tubes 12 are grouted and filled. And after the crown beam 5 at the pile top of the fender pile is poured and meets a certain strength, tensioning and anchoring the steel strand 13, and filling cement slurry into the U-shaped pipe 12. The symmetrical tensioning mode can ensure that the concrete does not generate over stress, the reinforcement cage does not twist and bend laterally, and the like. The post-tensioning method is adopted to apply prestress, pedestal equipment is not needed, and flexibility is high. The construction method enables the prestressed tendon and the concrete structure to be integrated, and improves the anchoring reliability and durability of the prestressed tendon.

In this embodiment, the post-tensioned prestressed fender post is composed of a stirrup 111, a longitudinal bar 112, a U-shaped pipe 12 and a steel strand 13, wherein the steel strand 13 is assembled into a steel reinforcement cage structure 1, the steel strand 13 matched in design is arranged in the U-shaped pipe 12 in a penetrating manner, the steel strand 13 penetrates into the steel reinforcement cage structure 1 of the U-shaped pipe 12 and is placed into a pile hole 2, concrete is poured into the pile hole 3, a crown beam 5 is poured on the pile top, the concrete strength of a pile body and the concrete strength of the crown beam 5 meet that the post-tensioned steel strand 13 is anchored on the pile top, cement slurry is filled into the U-shaped pipe 12, the fender post is put into engineering use, the steel amount for reinforcing steel bars is reduced, the weight of the steel reinforcement cage structure 1 is reduced, the rigidity of the fender post is increased, and the deformation of a foundation pit is reduced. Meanwhile, the steel strand 13 of the non-stressed part is recycled and put into the next pile for use, so that economy is achieved.

Referring to fig. 4, the reinforcement cage structure 1 is lowered to the pile hole 2, clear water is injected into the U-shaped pipe 12, and the top end of the U-shaped pipe 12 is plugged, so that concrete can be prevented from entering the U-shaped pipe 12 in the pile body concrete pouring process, and the U-shaped pipe is protected from being damaged in the pile body concrete pouring process. And a pressure-bearing steel plate 4 for dispersing pressure is arranged between the pile body and the crown beam 5, so that the pile body and the crown beam are prevented from being damaged due to stress concentration. And then, the steel strand in the non-stressed direction which is not in the stressed area 3 is recovered according to the stress requirement.

The utility model provides a post-tensioned bonded prestressed fender post, a construction method thereof and a manufacturing method of a steel reinforcement cage structure, which can use a steel strand prestress technology for the fender post and save the steel consumption; meanwhile, the rigidity of the fender post is improved by utilizing the prestress technology, the integral stability of soil is improved, the deformation and settlement of the periphery of the foundation pit are reduced, and the fender post is simple in structure, convenient to use and high in reliability.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A post-tensioned bonded prestressed fender post is characterized by comprising a reinforcement cage structure, wherein the reinforcement cage structure comprises a reinforcement cage framework, a plurality of U-shaped pipes arranged on the reinforcement cage framework and steel strands penetrating through the U-shaped pipes; the steel reinforcement cage framework comprises longitudinal bars and stirrups, the U-shaped pipes are arranged at equal intervals along the inner side of the steel reinforcement cage framework, and steel strands penetrating through the U-shaped pipes are carriers for applying prestress.

2. The post-tensioned prestressed fender post according to claim 1, wherein said U-shaped tube is fixed to the inner side of the cage frame and bent in a U-shape at a distance from the bottom of the cage frame.

3. The post-tensioned prestressed fender post according to claim 1 or 2, wherein a plurality of U-shaped tubes are arranged at equal intervals in the horizontal direction, are arranged in a staggered manner in the vertical direction toward the bottom end close to the reinforcement cage frame, and are fixed to the reinforcement cage frame.

4. The post-tensioned prestressed fender post according to claim 1, wherein a top beam is provided on the top end of the reinforcement cage structure, the top beam is connected with a plurality of reinforcement cage structures by concrete casting to form a foundation pit supporting structure, wherein the steel strands of the reinforcement cage structures are all tensioned and anchored after passing through the top beam, and then grouting and filling are performed into the U-shaped tubes.