CN109457599B - Splicing structure and construction method of hollow pier and cap - Google Patents

Abstract

The invention relates to a splicing structure of a hollow pier and a cap, comprising a prefabricated cap and a prefabricated hollow pier column, the prefabricated hollow pier column includes a prefabricated hollow pipe body, and several prefabricated corner columns are arranged at the lower part of the prefabricated hollow pipe body, Each prefabricated corner column is provided with a grouting connector, and several pier column longitudinal reinforcements are embedded in the prefabricated hollow pier column, and the pier column longitudinal reinforcement is connected with the grouting connector one by one, and the prefabricated cap There are several longitudinal reinforcements embedded in the cap, and the upper part of the longitudinal reinforcement of the cap extends out of the cap and extends into the grouting connector to overlap the longitudinal reinforcement of the pier column; the present invention also relates to a splicing structure of a hollow pier and a cap Construction method. The invention not only has a simple and reasonable structural design, but also has convenient and fast construction, strong shear resistance, good overall mechanical performance, and better technical and economic benefits.

Description

Splicing structure and construction method of hollow pier and cap

technical field

The invention relates to a splicing structure of a hollow pier and a bearing platform and a construction method.

Background technique

For the early traffic construction, the scale and application of bridges were small. Economically, the application of prefabricated piers may not be as good as cast-in-place piers, but today’s large-scale expressways, urban viaducts, and rail transit make the proportion of bridges in the line more and more The higher, the large-scale prefabricated assembly is more suitable for today's society. The prefabrication and assembly technology of bridge structures has the characteristics of high efficiency, safety, high quality, speed and environmental protection, and has become the development trend of bridge construction in the world today.

At present, there are two commonly used methods for the splicing of prefabricated pier columns and caps. Although the connection structure has been greatly improved compared with traditional cast-in-place construction, the construction speed is fast, and the traffic impact is small, but there are still the following problems: The first method is to weld on-site the longitudinal reinforcement sections protruding from the top surface of the cap platform and the bottom surface of the prefabricated pier column respectively, and pour the concrete of the connecting section, but this method is difficult to weld and needs to be guided by short columns for positioning, etc.; the second method It is a prefabricated section, and the contact surface between the prefabricated pier column and the cap is often spliced with a mortar cushion, but this method has poor shear resistance of the connecting section and poor overall mechanical performance.

Contents of the invention

In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a splicing structure and construction method of a hollow pier and cap, which is not only reasonable in structural design, but also efficient and convenient.

In order to solve the above technical problems, the technical solution of the present invention is: a splicing structure of a hollow pier and a cap, including a prefabricated cap and a prefabricated hollow pier column, the prefabricated hollow pier column includes a prefabricated hollow tube body, and the prefabricated hollow tube The lower part of the body is provided with several prefabricated corner columns, and each prefabricated corner column is provided with a grouting connector, and several pier column longitudinal reinforcements are embedded in the prefabricated hollow pier column, and the pier column longitudinal reinforcement and the grouting connector One-to-one connection, the prefabricated cap platform is embedded with several cap vertical reinforcements, the upper part of the cap vertical reinforcement protrudes from the cap platform and extends into the grouting connector to overlap the pier column longitudinal reinforcement.

Further, the upper part of the grouting connector is provided with a grouting hole, and the lower part of the grouting connector is provided with a grouting hole.

Further, the inner cavity of the grouting connector is the first cast-in-place area, and ultra-high performance concrete is poured in the first cast-in-place area.

Further, the prefabricated corner column, the lower part of the prefabricated hollow pier column and the cap form a second cast-in-place area, and self-compacting concrete is poured in the second cast-in-place area.

Further, the longitudinal reinforcement of the platform cap is L-shaped, the lower part of the longitudinal reinforcement of the platform is arranged horizontally, the middle part and the upper part of the longitudinal reinforcement of the platform are arranged vertically, and the lower part and the middle part of the longitudinal reinforcement of the platform are pre-buried in the prefabricated deck.

Further, the grouting connector is a grouting sleeve or a grouting bellows.

Further, several prefabricated corner columns are arranged at intervals in the circumferential direction.

A construction method for a splicing structure of a hollow pier and a cap, comprising the splicing structure of a hollow pier and a cap described in any one of the above, comprising the following steps:

1) hoisting the prefabricated hollow pier column above the prefabricated cap, inserting the grouting connector into the longitudinal reinforcement of the cap, and pouring ultra-high performance concrete into the grouting connector to complete the positioning;

2) Formwork is supported on the outer peripheral side of the lower part of the prefabricated hollow pier, pouring self-compacting concrete to the lower part of the prefabricated hollow pier, and connecting the prefabricated cap and the prefabricated hollow pier as a whole.

Compared with the prior art, the present invention has the following beneficial effects: the present invention not only has a simple and reasonable structural design, but also has convenient and quick construction, strong shear resistance, good overall mechanical performance, and good technical and economic benefits.

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the structure of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view along the direction A-A of the structure of the embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of the B-B direction of the structure of the embodiment of the present invention.

In the figure: 1- prefabricated cap, 2- prefabricated hollow pier column, 201- prefabricated hollow pipe body, 202- prefabricated corner column, 3- grouting connector, 4- longitudinal reinforcement of pier column, 5- longitudinal reinforcement of cap, 6- Grouting hole, 7- grouting hole, 8- the first cast-in-place area, 9- the second cast-in-place area.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 3, a splicing structure of a hollow pier and a cap, including a prefabricated cap 1 and a prefabricated hollow pier column 2, the prefabricated hollow pier column 2 includes a prefabricated hollow pipe body 201, and the prefabricated hollow pipe body The lower part of 201 is provided with several prefabricated corner columns 202, and each prefabricated corner column 202 is provided with a grouting connector 3, and several pier column longitudinal ribs 4 are embedded in the prefabricated hollow pier column 2, and the pier column vertical The ribs 4 are connected to the grouting connector 3 in one-to-one correspondence, and several cap longitudinal ribs 5 are embedded in the prefabricated platform 1, and the upper part of the platform longitudinal rib 5 extends out of the cap and into the grouting connector 3 and the grouting connector 3. The longitudinal reinforcement 4 of the pier column is overlapped; the prefabricated corner column 202 plays the role of guiding and positioning, and the grouting connector 3 is used to realize its rapid assembly; the lower part of the prefabricated hollow pipe body 201 is provided with several prefabricated Corner column 202, so when the prefabricated hollow pier column 2 is connected with the prefabricated cap 1, only four outer parallel formworks are needed, which saves materials and facilitates construction; Insufficient mechanical load caused by the problem, as shown in Figure 1, the lower part of the grouting connector 3 is exposed, which is beneficial to the extension of the longitudinal rib 5 of the cap.

In the embodiment of the present invention, the grouting connector 3 is provided with a grouting hole 6 at the upper part, and the grouting connector 3 is provided with a grouting hole 7 at the lower part.

In the embodiment of the present invention, the inner cavity of the grouting connector 3 is the first cast-in-place area 8 , and ultra-high performance concrete is poured in the first cast-in-place area 8 .

In the embodiment of the present invention, the prefabricated corner column 202, the lower part of the prefabricated hollow pier column 2 and the cap form a second cast-in-place area 9, and self-compacting concrete is poured in the second cast-in-place area 9, so The contact surface between the second cast-in-place area 9 and the prefabricated hollow pipe body 201, the prefabricated corner column 202 and the bearing platform needs to be chiseled and the reserved steel bars need to be derusted; the second cast-in-place area 9 adopts self-compacting concrete, which is convenient for construction. And it is beneficial to improve the shear performance of the connecting section and the overall mechanical performance.

In the embodiment of the present invention, the longitudinal rib 5 of the cap is L-shaped, the lower part of the longitudinal rib 5 is arranged horizontally, the middle part and the upper part of the longitudinal rib 5 are arranged vertically, and the longitudinal rib 5 is arranged vertically. The lower part and the middle part of 5 are all pre-buried in the prefabricated platform 1.

In the embodiment of the present invention, the grouting connector 3 is a grouting sleeve or a grouting bellows.

In the embodiment of the present invention, several prefabricated corner columns 202 are arranged at intervals in the circumferential direction.

In an embodiment of the present invention, a construction method for a splicing structure of a hollow pier and a cap, including the splicing structure of a hollow pier and a cap described in any one of the above, includes the following steps:

1) Hoist the prefabricated hollow pier column 2 above the prefabricated platform cap 1, insert the grouting connector 3 into the longitudinal rib 5 of the cap, and pour ultra-high performance concrete into the grouting connector 3 to complete the positioning ;

2) Formwork is supported on the outer peripheral side of the lower part of the prefabricated hollow pier 2, self-compacting concrete is poured on the lower part of the prefabricated hollow pier 2, and the prefabricated hollow pier 2 is connected as a whole.

In the embodiment of the present invention, pre-construction preparation: according to the design drawings, the construction site is cleaned up, and construction materials, machinery, and personnel are arranged to be in place, and the prefabricated cap 1 and the prefabricated hollow pier column 2 are prepared.

Unless otherwise stated, the terms used in any of the technical solutions disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them.

Any component provided by the present invention can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the specific implementation of the present invention can still be carried out Modification or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, all of them shall be included in the scope of the technical solution claimed in the present invention.

Claims (5)

1. The utility model provides a hollow mound and cushion cap mosaic structure which characterized in that: the prefabricated hollow pier column comprises a prefabricated hollow pipe body, a plurality of prefabricated corner columns are arranged at the lower part of the prefabricated hollow pipe body, grouting connectors are arranged in each prefabricated corner column, a plurality of pier column longitudinal ribs are buried in the prefabricated hollow pier column, the pier column longitudinal ribs are connected with the grouting connectors in a one-to-one correspondence manner, a plurality of bearing platform longitudinal ribs are buried in the prefabricated bearing platform, and the upper parts of the bearing platform longitudinal ribs extend out of the bearing platform and are connected with the pier column longitudinal ribs in a lap joint manner;

the inner cavity of the grouting connector is a first cast-in-place area, and ultra-high performance concrete is poured in the first cast-in-place area;

a second cast-in-situ area is defined among the prefabricated corner posts, the lower parts of the prefabricated hollow pier posts and the bearing platform, and self-compacting concrete is poured in the second cast-in-situ area;

the prefabricated corner columns are circumferentially arranged at intervals.

2. The hollow pier and cap splice structure of claim 1, wherein: the upper portion of the grouting connector is provided with a grout outlet, and the lower portion of the grouting connector is provided with a grouting hole.

3. The hollow pier and cap splice structure of claim 1, wherein: the bearing platform longitudinal bar is L-shaped, the lower part of the bearing platform longitudinal bar is transversely arranged, the middle part and the upper part of the bearing platform longitudinal bar are longitudinally arranged, and the lower part and the middle part of the bearing platform longitudinal bar are pre-buried in the prefabricated bearing platform.

4. The hollow pier and cap splice structure of claim 1, wherein: the grouting connector is a grouting sleeve or a grouting corrugated pipe.

5. A construction method of a splicing structure of a hollow pier and a bearing platform is characterized by comprising the following steps: the splicing structure of the hollow pier and the bearing platform according to any one of claims 1-4, comprising the following steps:

hoisting the prefabricated hollow pier column to the upper part of a prefabricated bearing platform, sleeving the grouting connector into a bearing platform longitudinal rib, and pouring ultra-high performance concrete into the grouting connector to finish positioning;

and erecting a template on the periphery of the lower part of the prefabricated hollow pier column, pouring self-compacting concrete to the lower part of the prefabricated hollow pier column, and connecting the prefabricated bearing platform and the prefabricated hollow pier column into a whole.

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