Prefabricated hollow bridge pier with inner steel bar cross anchorage and construction method thereof

Abstract

The present invention discloses a prefabricated hollow pier with cross-anchored inner steel bars and a construction method thereof. The structure includes a hollow pier body, wherein the upper and lower ends of the hollow pier body are respectively provided with a cap beam and a pedestal, and the hollow pier body is provided with outer longitudinal main bars and inner longitudinal steel bars, and the outer longitudinal main bars are connected to the cap beam and the pedestal through a grouting sleeve. The construction method includes S1, pre-embedding the outer longitudinal main bars in the pedestal, and pre-embedding the longitudinal steel bars in the pedestal, and S2, applying a mortar cushion layer on the pedestal. Since the hollow pier body, the pedestal and the cap beam are connected in a new way, the inner longitudinal steel bars in the hollow pier body do not need to be arranged with a grouting sleeve, and the arrangement is convenient when the arrangement space of the hollow pier body is restricted, thereby effectively improving the pouring quality of the inner cavity concrete at the pier bottom connection part of the hollow pier body, while not affecting the force transmission performance of the structure.

Description

Technical Field

[0001] The invention relates to the technical field of bridge pier construction, and in particular to a prefabricated hollow bridge pier with inner steel bars cross-anchored and a construction method thereof. Background Art

[0002] In the existing technology, prefabricated bridge structures have good social and economic benefits because their construction can speed up construction, reduce the impact on the environment and traffic, and reduce dangerous operations such as high-altitude operations.

[0003] In practical applications, prefabricated bridge structures are subject to limitations in on-site lifting equipment and transportation capacity, and therefore are in urgent need of lightweight prefabricated piers to expand the scope of application of prefabricated piers.

[0004] The use of hollow prefabricated piers can reduce the weight of prefabricated structures and has a good application prospect. The connection between the hollow prefabricated piers and the pedestal or cap beam structure can adopt the conventional reinforcement arrangement form by arranging longitudinal reinforcement both inside and outside. The longitudinal reinforcement of the column and the longitudinal reinforcement between the pedestal and the cap beam are connected by grouting sleeves.

[0005] However, when the diameter of the grouting sleeve is much larger than that of the steel bar, the diameter of the grouting sleeve corresponding to the steel bar with a diameter of 40 mm is 95 mm, and when the wall thickness of the hollow pier is thin, the inner and outer layers of the grouting sleeves are arranged at the same time, the arrangement space is constrained, which is not conducive to the quality control of precast concrete pouring.

[0006] Technicians in this technical field are committed to solving the above-mentioned technical defects. Summary of the invention

[0007] In view of the above-mentioned defects in the prior art, the technical purpose of the present invention is to solve the problems mentioned in the above-mentioned background technology.

[0008] To achieve the above technical objectives, the present invention provides a prefabricated hollow pier with cross-anchored inner steel bars, comprising a hollow pier body, wherein a cap beam and a pedestal are respectively provided at the upper and lower ends of the hollow pier body; outer longitudinal main bars and inner longitudinal steel bars are provided on the hollow pier body, the outer longitudinal main bars are connected to the cap beam and the pedestal through a grouting sleeve, the inner longitudinal steel bars do not extend into the cap beam and the pedestal, and embedded longitudinal steel bars are respectively provided in the cap beam and the pedestal, and the embedded longitudinal steel bars and the inner longitudinal steel bars are anchored in the hollow pier body.

[0009] Preferably, the pier top and the pier bottom of the hollow pier body are respectively provided with a pouring hole and a slurry discharge hole.

[0010] Preferably, stirrups are arranged between the outer longitudinal main reinforcement and the inner longitudinal reinforcement and between the outer longitudinal main reinforcement and the embedded longitudinal reinforcement, respectively.

[0011] Preferably, a mortar cushion layer is provided between the foundation and the hollow pier body and between the cap beam and the hollow pier body.

[0012] Preferably, shear keys and baffles are provided on the hollow pier body.

[0013] The present invention also discloses a construction method of a prefabricated hollow bridge pier with inner steel bars cross-anchored, comprising the following steps:

[0014] S1. Pre-embed the outer longitudinal main reinforcement in the cap, and pre-embed the longitudinal reinforcement in the cap;

[0015] S2. Apply mortar cushion layer on the cap;

[0016] S3. Install the main body of the hollow pier;

[0017] S4, pouring the inner cavity concrete of the connection section between the hollow pier body and the cap, and setting up a baffle on the hollow pier body;

[0018] S5. After applying a mortar cushion layer on the cap beam, install the cap beam. Finally, pour the inner cavity concrete of the connection section between the hollow pier body and the cap beam.

[0019] Beneficial effects of the present invention:

[0020] Since the hollow pier body, the abutment and the cap beam are connected in a new manner, the present invention can make it unnecessary to arrange grouting sleeves for the inner longitudinal reinforcement in the hollow pier body, and facilitate arrangement when the arrangement space of the hollow pier body is restricted, thereby effectively improving the pouring quality of the inner cavity concrete at the pier bottom connection part of the hollow pier body, and at the same time does not affect the force transmission performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structural elevation of the present invention;

[0022] Figure 2 It is a schematic diagram of a structural cross-section elevation of the present invention;

[0023] Figure 3 It is a schematic diagram of the structural section of the present invention;

[0024] Figure 4 A schematic diagram of the state of constructing a cap according to the present invention;

[0025] Figure 5 It is a schematic diagram of the state of applying a mortar cushion layer on a cap according to the present invention;

[0026] Figure 6 This is a schematic diagram of the main state of installing the hollow bridge pier on the cap according to the present invention;

[0027] Figure 7It is a schematic diagram of the state of pouring the inner cavity concrete of the connection section between the column and the pedestal and setting up the baffle in the present invention;

[0028] Figure 8 It is a schematic diagram of the inner cavity concrete state of the cap beam installation, pouring columns and the cap beam connection section according to the present invention.

[0029] In the figure: 1 hollow pier body, 2 outer longitudinal reinforcement, 3 inner longitudinal reinforcement, 4 stirrups, 5 grouting sleeves, 6 embedded longitudinal reinforcement, 7 inner cavity concrete, 8 mortar cushion, 9 pouring holes, 10 grouting holes, 11 shear keys, 12 baffles. DETAILED DESCRIPTION

[0030] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0031] Example:

[0032] like Figure 1-Figure 3 As shown, a prefabricated hollow pier with inner steel bars cross-anchored comprises a hollow pier body 1, wherein the upper end and the lower end of the hollow pier body 1 are respectively provided with a cap beam and a cap platform;

[0033] The hollow pier body 1 is provided with outer longitudinal main reinforcement 2 and inner longitudinal reinforcement 3. The outer longitudinal main reinforcement 2 is connected to the cap beam and the abutment through a grouting sleeve 5. The inner longitudinal reinforcement 3 does not extend into the cap beam and the abutment. The cap beam and the abutment are respectively provided with embedded longitudinal reinforcement 6. The embedded longitudinal reinforcement 6 and the inner longitudinal reinforcement 3 are anchored in the hollow pier body 1.

[0034] Specifically, the top and bottom of the hollow pier body 1 are respectively provided with a pouring hole 9 and a slurry outlet hole 10 .

[0035] Specifically, stirrups 4 are arranged between the outer longitudinal main reinforcement 2 and the inner longitudinal reinforcement 3 and between the outer longitudinal main reinforcement 2 and the embedded longitudinal reinforcement 6 .

[0036] Specifically, the grouting sleeve 5 is a metal bellows.

[0037] Specifically, a mortar cushion layer 8 is provided between the cap and the hollow pier body 1 and between the cap beam and the hollow pier body 1 .

[0038] Specifically, a shear key 11 and a baffle 12 are provided on the hollow pier body 1 to prevent slurry from leaking out when pouring the inner cavity concrete 7. The shear key 11 can be a post-installed steel structure shear key 11.

[0039] Specifically, vertical prestressed steel bars may be arranged in the hollow pier body 1, and the top of the hollow pier body 1 may not be connected to the cap beam, and the inner cavity concrete 7 may be directly poured on the top to bear the load.

[0040] The principle of the present invention is that according to the concrete structure design principle described in the "Design Code for Reinforced Concrete and Prestressed Concrete Bridges and Culverts" (JTG3362), when the steel bars penetrate into the concrete to a sufficient length, they can be effectively anchored, and the inner cavity of the hollow pier body 1 after roughening can achieve force transmission between the concrete after pouring the inner cavity concrete 7, and the two can be regarded as an integral concrete structure; therefore, the pre-embedded longitudinal steel bars 6 in the cap beam and the pedestal are overlapped with the inner longitudinal steel bars 3 in the concrete by a sufficient length, so that the two can be effectively anchored in the concrete, and when the structure is subjected to force, the effective transmission of the stress of the steel bars can be achieved.

[0041] like Figure 4-Figure 8 As shown, a construction method of a prefabricated hollow bridge pier with inner steel bars cross-anchored comprises the following steps:

[0042] S1, embedding outer longitudinal main reinforcement 2 in the cap, and embedding longitudinal reinforcement 6 in the cap;

[0043] S2, applying a mortar cushion layer 8 on the cap;

[0044] S3, installing the hollow pier body 1;

[0045] S4, pouring the inner cavity concrete 7 of the connection section between the hollow pier body 1 and the cap, and setting up the baffle 12 on the hollow pier body 1;

[0046] S5. After applying a mortar cushion layer 8 on the cap beam, the cap beam is installed. Finally, the inner cavity concrete 7 of the connection section between the hollow pier body 1 and the cap beam is poured.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A prefabricated hollow bridge pier with inner steel bars cross-anchored, comprising a hollow bridge pier body, characterized in that: A cap beam and a pedestal are respectively provided at the upper and lower ends of the hollow pier body; outer longitudinal main reinforcements and inner longitudinal reinforcements are provided on the hollow pier body, the outer longitudinal main reinforcements are connected to the cap beam and the pedestal through grouting sleeves, the inner longitudinal reinforcements do not extend into the cap beam and the pedestal, and embedded longitudinal reinforcements are respectively provided in the cap beam and the pedestal, and the embedded longitudinal reinforcements and the inner longitudinal reinforcements are anchored in the hollow pier body.

2. The prefabricated hollow bridge pier with inner steel bars cross-anchored according to claim 1, characterized in that: The pier top and the pier bottom of the hollow pier body are respectively provided with a pouring hole and a slurry outlet hole.

3. The prefabricated hollow bridge pier with inner steel bars cross-anchored according to claim 1, characterized in that: Stirrups are arranged between the outer longitudinal main reinforcement and the inner longitudinal reinforcement and between the outer longitudinal main reinforcement and the embedded longitudinal reinforcement.

4. The prefabricated hollow bridge pier with inner steel bars cross-anchored according to claim 1, characterized in that: A mortar cushion layer is respectively arranged between the foundation and the hollow pier body and between the cap beam and the hollow pier body.

5. The prefabricated hollow bridge pier with inner steel bars cross-anchored according to claim 1, characterized in that: The hollow pier body is provided with shear keys and baffles.

6. A construction method for a prefabricated hollow bridge pier with inner steel bars cross-anchored as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Pre-embed the outer longitudinal main reinforcement in the cap, and pre-embed the longitudinal reinforcement in the cap; S2. Apply mortar cushion layer on the cap; S3. Install the main body of the hollow pier; S4, pouring the inner cavity concrete of the connection section between the hollow pier body and the cap, and setting up a baffle on the hollow pier body; S5. After applying a mortar cushion layer on the cap beam, install the cap beam. Finally, pour the inner cavity concrete of the connection section between the hollow pier body and the cap beam.

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