CN114134805A

CN114134805A - Prefabricated pier adopting splicing and construction method

Info

Publication number: CN114134805A
Application number: CN202111311081.3A
Authority: CN
Inventors: 叶嘉彬; 陈庆军; 蔡健; 何岸
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-03-04

Abstract

The invention discloses a prefabricated pier adopting splicing and a construction method, the prefabricated pier comprises a support column and a bearing platform, an adapter of the support column is connected with a support of the bearing platform, a connecting groove is arranged between the bearing platform and the support, a longitudinal rib of the support column is connected with the connecting groove, the longitudinal rib is provided with a U-shaped elbow, a strip-shaped groove connected with the U-shaped elbow is arranged in the connecting groove, concrete is filled in the connecting groove, the longitudinal rib is connected with the connecting groove of the bearing platform through the U-shaped elbow, the U-shaped elbow can increase the anchoring capacity with the concrete, meanwhile, the shearing resistance and the shock resistance of the prefabricated pier are increased, the stress performance equivalent to a cast-in-place structure is met, the construction of the support column and the bearing platform is facilitated respectively, and the construction progress is accelerated.

Description

Prefabricated pier adopting splicing and construction method

Technical Field

The invention relates to the technical field of bridge structures and construction, in particular to a spliced prefabricated pier and a construction method.

Background

With the continuous development of society, the formation of green infrastructure networks for interconnection and intercommunication among countries along the line is continuously promoted. At the present stage, the assembly type bridge system is being widely popularized. According to the earthquake-resistant performance, the prefabricated pier system is generally divided into two types of equal cast-in-place and unequal cast-in-place, and the former mainly depends on four connection modes of sleeve grouting connection, corrugated pipe grouting connection, reserved slotted hole grouting connection, socket joint type connection and the like.

And the socket joint type connection is that a preformed hole is arranged in the bottom bearing platform, the prefabricated pier provided with the shear-resistant key groove is inserted into the preformed hole of the bearing platform, and mortar or concrete is injected into the bottom and the periphery of the prefabricated pier to realize the integral connection between the prefabricated pier and the capping beam or the bearing platform. Compared with other connection forms, the method has the advantages that the process is simple, the precision requirements on production and construction stages are not high, and the defects that a post-cast connection part is not provided with a steel reinforcement cage generally, so that the pier is subjected to a horizontal effect, for example, the bridge pier is mainly subjected to the shearing force at the key groove and the strength of concrete around to resist the prying force caused by earthquake load. The prior research results show that the hysteresis performance of the composite material under the action of earthquake is biased to pinch and shrink form, and the equivalent cast-in-place earthquake-resistant performance is difficult to achieve.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to provide a prefabricated pier adopting splicing. The stress performance equivalent to that of a cast-in-place structure is realized, and the shearing resistance of the pier is improved.

The invention also aims to provide a construction method of the prefabricated bridge pier adopting splicing. The precision requirement on the production and the site construction of the prefabricated part is low, and the construction efficiency is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an adopt prefabricated pier of concatenation, includes support column and cushion cap, the adapter head of support column is connected with the support of cushion cap, be equipped with between cushion cap and the support and link up the groove, the vertical muscle and the linking groove of support column are connected, vertical muscle is equipped with the U-shaped elbow, it makes U-shaped elbow male bar groove to link up to be equipped with in the inslot, it packs the concrete to link up the inslot.

Preferably, the center of the joint head is provided with a middle rib, the center of the support is provided with a central hole, and the middle rib is connected with the central hole.

Preferably, four corners of the supporting column are provided with reinforcing longitudinal ribs.

Preferably, the opening of the U-shaped elbow faces upwards, and the closed end of the U-shaped elbow faces downwards.

Preferably, the support column further comprises a grouting channel and a grouting inlet, one end of the grouting channel is communicated with the connecting groove, and the other end of the grouting channel is communicated with the grouting inlet.

Preferably, the support column further comprises an annular hoop, and the annular hoop is sleeved on the outer walls of the upper longitudinal rib and the lower longitudinal rib.

A construction method of a spliced prefabricated pier comprises the following steps:

s1, reserving a connecting groove in the center of the bearing platform, and reserving a strip-shaped groove in the connecting groove;

s2, sleeving a plurality of groups of annular stirrups on longitudinal ribs in advance, hoisting the central ribs of the prefabricated support columns into the central holes of the support, and inserting the longitudinal ribs into the strip-shaped grooves;

s3, binding longitudinal ribs by using annular stirrups; and (3) building a template sealing joint on the outer side of the annular stirrup, pouring concrete at a grouting inlet, arranging an attached concrete vibrator on the outer side of the template for vibrating, and curing for 14d after the concrete is hardened to complete construction.

Preferably, between S2 and S3, a high pressure fan is used to clean the debris in the joining tank.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention adopts a socket-type prefabricated pier, an adapter of a support column of the prefabricated pier is connected with a support of a bearing platform, an adapter groove is arranged between the bearing platform and the support, a longitudinal rib of the support column is connected with the adapter groove, the longitudinal rib is provided with a U-shaped elbow, a strip-shaped groove for inserting the U-shaped elbow is arranged in the adapter groove, concrete is filled in the adapter groove, the longitudinal rib is connected with the adapter groove of the bearing platform through the U-shaped elbow, the U-shaped elbow can increase the anchoring capacity with the concrete, the shearing resistance and the shock resistance of the prefabricated pier are increased at the same time, the bearing capacity equivalent to a cast-in-place structure is met, the construction of the support column and the bearing platform is facilitated respectively, and the construction and installation progress is accelerated.

2. The invention adopts a socket-type prefabricated bridge pier, the center of an adapter of the prefabricated bridge pier is provided with a middle rib, the center of a support is provided with a central hole, the middle rib is connected with the central hole, the middle rib arranged at the center of a support column can be used for assisting the positioning of the support column and a bearing platform, and the middle rib is adopted to further increase the shearing resistance of the support column and the bearing platform.

3. The socket-type prefabricated pier is adopted, the opening of the U-shaped elbow of the prefabricated pier is upward, the closed end of the U-shaped elbow is downward, concrete can be filled between the openings of the U-shaped elbows, the gripping force of the prefabricated pier can be increased by adopting the upward opening of the U-shaped elbow, the firmness of components is ensured, and the combination degree of the reinforcing steel bars and the concrete is increased.

4. The construction method of the socket-type prefabricated pier is adopted, the prefabricated installation is adopted, the operations of binding a large number of steel bars and erecting templates are avoided, the construction efficiency is improved, temporary support is not needed after the hoisting, the precision requirements on the production of prefabricated parts and the site construction are low, the construction is easier, and the investment of site operators can be reduced.

Drawings

Fig. 1 is a schematic view of a prefabricated pier using a splice according to the present invention.

Fig. 2 is a partially enlarged view of a prefabricated pier using a splice according to the present invention.

Fig. 3 is a plan view of a cap for a prefabricated pier using a splice according to the present invention.

The grouting device comprises a supporting column 1, an adaptor 11, a longitudinal rib 12, a reinforcing longitudinal rib 121, a U-shaped elbow 13, a middle rib 14, an annular stirrup 15, a grouting inlet 16, a grouting channel 17, a bearing platform 2, an adaptor groove 21, a support 22, a strip groove 23 and a central hole 24.

Detailed Description

The following describes the object of the present invention in further detail with reference to the drawings and specific examples, which are not repeated herein, but the embodiments of the present invention are not limited to the following examples.

As shown in fig. 1 to 3, a prefabricated pier adopting splicing, includes support column 1 and cushion cap 2, the adapter 11 of support column 1 is connected with the support 22 of cushion cap 2, be equipped with between cushion cap 2 and the support 22 and link up the groove 21, the vertical muscle 12 and the link up the groove 21 of support column 1 are connected, vertical muscle 12 is equipped with U-shaped elbow 13, it makes U-shaped elbow 13 male bar groove 23 to be equipped with in the link up the groove 21, fill the concrete in the link up the groove 21, vertical muscle 12 is connected with the link up groove 21 of cushion cap 2 through U-shaped elbow 13, U-shaped elbow 13 can increase the anchoring ability with the concrete, has increased prefabricated pier's shearing and antidetonation ability simultaneously, satisfies the atress performance that is equal to cast-in-place structure, still is favorable to support column 1 and cushion cap 2 to be under construction respectively, accelerates construction installation progress.

The center of the joint head 11 is provided with a middle rib 14, the center of the support 22 is provided with a center hole 24, the middle rib 14 is connected with the center hole 24, the middle rib 14 is arranged at the center of the support column 1 and can be used for assisting the positioning of the support column 1 and the bearing platform 2, and the middle rib 14 is adopted to further increase the shearing resistance of the support column 1 and the bearing platform 2.

The four corners of support column 1 are equipped with strengthens vertical muscle 121, and the setting is strengthened vertical muscle 121 and can be increased the ability of shearing in support column 1 four corners to further strengthen the shear resistance of prefabricated pier.

The opening of U-shaped elbow 13 up, the blind end of U-shaped elbow 13 is down, and the open end and the longitudinal reinforcement of this U-shaped elbow 13 are connected, and the U capable elbow is 180 angle bends, and U-shaped elbow 13 can be with vertical muscle 12 integrated design shaping, can fill the concrete between the opening of U-shaped elbow 13, just can't effectively utilize the atress performance of U-shaped elbow 13 down if the opening of U-shaped elbow 13, the opening that adopts U capable elbow 13 can increase the bond stress of prefabricated pier up, guarantees the fastness of component, increases the combination degree of reinforcing bar and concrete.

The supporting column 1 further comprises a grouting channel 17 and a grouting inlet 16, one end of the grouting channel 17 is communicated with the connection groove 21, the other end of the grouting channel 17 is communicated with the grouting inlet 16, the grouting inlet 16 is formed in the upper end of the supporting column 1, so that concrete can conveniently flow into the connection groove 21 through the grouting channel 17, the connection head 11 and the connection groove 21 are integrated after construction, no gap exists, and the shearing resistance of a shearing resisting part is improved.

The supporting column 1 further comprises an annular hoop 15, the annular hoop 15 is sleeved on the outer wall of the longitudinal rib 12, the annular hoop 15 increases the structural integrity of the longitudinal rib 12, increases the shear strength of the oblique section of the supporting column 1, and connects the longitudinal rib 12 and the concrete in the compression area to enable the longitudinal rib 12 and the concrete to work together.

s1, reserving a connecting groove 21 in the center of the bearing platform 2, and reserving a strip-shaped groove 23 in the connecting groove 21;

s2, sleeving a plurality of groups of annular stirrups 15 on longitudinal ribs 12 in advance, hoisting central ribs 14 of the prefabricated support column 1 into a central hole 24 of a support 22, and inserting the longitudinal ribs 12 into strip-shaped grooves 23;

s3, binding the longitudinal ribs 12 by using the annular stirrups 15; the template sealing joint 11 is built on the outer side of the annular stirrup 15, concrete is poured into the grouting inlet 16, an attached concrete vibrator is arranged on the outer side of the template for vibrating, the template can be detached after the concrete is completely solidified, and then construction is completed by maintaining 14 d.

The construction method adopts the prefabricated installation, avoids a large amount of steel bar binding and formwork erection operation, improves the construction efficiency, does not need temporary support after hoisting, and has lower precision requirements on the production and site construction of prefabricated parts, thereby being easier to construct and reducing the investment of site operators.

Between S2 and S3, adopt high pressure positive blower to clear up the rubble residue in linking up the groove 21, avoid adulterating rubbish in the concreting to influence the compressive strength after the concrete sets.

The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an adopt prefabricated pier of concatenation, a serial communication port, includes support column and cushion cap, the adapter head of support column is connected with the support of cushion cap, be equipped with between cushion cap and the support and link up the groove, the vertical muscle of support column and link up the groove and be connected, vertical muscle is equipped with the U-shaped elbow, it makes U-shaped elbow male bar groove to link up the inslot, it packs the concrete to link up the inslot.

2. The prefabricated bridge pier adopting splicing as claimed in claim 1, wherein a central rib is arranged at the center of the adaptor, a central hole is formed at the center of the support, and the central rib is connected with the central hole.

3. The spliced prefabricated pier according to claim 1, wherein reinforcing longitudinal ribs are arranged at four corners of the supporting column.

4. The prefabricated pier adopting splicing as claimed in claim 1, wherein the opening of the U-shaped bend faces upwards, and the closed end of the U-shaped bend faces downwards.

5. The spliced precast pier according to claim 1, wherein the support column further comprises a grouting channel and a grouting inlet, one end of the grouting channel is communicated with the connecting groove, and the other end of the grouting channel is communicated with the grouting inlet.

6. The spliced prefabricated pier according to claim 1, further comprising an annular stirrup sleeved on the outer walls of the upper longitudinal rib and the lower longitudinal rib.

7. A construction method of a spliced prefabricated pier is characterized by comprising the following steps:

8. The construction method of the precast pier using the spliced pier according to claim 7, wherein debris in the coupling groove is cleaned by a high pressure blower between S2 and S3.