CN212688679U

CN212688679U - Pier is assembled to dry joint unbonded prestressing force segment

Info

Publication number: CN212688679U
Application number: CN202021181982.6U
Authority: CN
Inventors: 毛冬旭; 鲁冰尧; 张风亮; 贠作义; 张少雄
Original assignee: China Construction First Bureau Group Decoration Engineering Co Ltd; Shaanxi Architecture Science Research Institute Co Ltd
Current assignee: China Construction First Bureau Group Decoration Engineering Co Ltd; Shaanxi Architecture Science Research Institute Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-03-12
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a do not have bondn prestressing force segment and assemble pier of splicing, including pier shaft longitudinal force reinforcing bar, hollow cross section, pier shaft stirrup and prefabricated pier of assembling, prefabricated pier of assembling includes bent cap, prefabricated segment pier shaft and cushion cap, prefabricated segment pier shaft is provided with four segments, four prefabricated segment pier shaft is prestressed reinforced concrete structure, the quantity of prefabricated pier of assembling is four, four the outside of prefabricated segment pier shaft all is provided with prestressed steel strand wires; the utility model discloses a shaping can be assembled in the short time to the pier segment section of assembling in the prefabrication, shortens substructure's construction cycle greatly, and reducible construction operation area reduces the influence to all ring edge borders and traffic, can avoid the pier test piece quality to be difficult to guarantee under uncertain factors such as weather and weather simultaneously, improves construction quality.

Description

Pier is assembled to dry joint unbonded prestressing force segment

Technical Field

The utility model belongs to the technical field of the bridge building among the civil engineering, concretely relates to pier is assembled to dry joint unbonded prestressing force festival section.

Background

At present, a great deal of concrete pouring operation is generally required to be carried out on bridge construction sites, the surrounding environment is greatly influenced, particularly, in the western part of China, highways are located in mountain areas and ecological protection areas, the traditional cast-in-place reinforced concrete bridge pier construction technology is limited due to ecological protection consideration and special reasons such as difficult accessibility of bridge sites, bad weather, short construction period and the like, the progressive construction method of the segment-assembled bridge pier test piece has little requirement on the construction site environment, the damage to the original landform can be reduced, and the interference to the surrounding environment can be reduced through rapid construction, so the application of the industrialized segment-assembled bridge pier construction technology in bridge construction is more and more favored by people, the segment-assembled bridge pier is formed by assembling prefabricated segments, and the bridge pier is favored by steel bar binding of bearing platforms, capping beams and bridge pier bodies, The construction process such as pouring is finished in a factory, and for the project that large-area cast-in-place concrete operation cannot be carried out on a construction site, the segment assembling process can be completed by hoisting the prefabricated segments, the prefabricated pier segments can be assembled and molded in a short time, the construction period of a substructure is greatly shortened, the construction operation area is reduced, the influence on the surrounding environment and traffic is reduced, meanwhile, the problem that the quality of a pier test piece is difficult to guarantee under the influence of uncertain factors such as weather and climate and the like can be avoided, and the construction quality is improved.

The existing engineering example of the pier assembled by the segments adopts a wet joint segment assembling process, the domestic engineering example and research on the assembling of dry joint segments are less, and the practical application of dry joint piers is less, so that the pier assembled by dry joint unbonded prestress with strong self-resetting capability, low structural damage degree and large ductility is selected, and the pier assembled by the dry joint unbonded prestress segments has important theoretical significance and practical value in the aspects of promoting the application of the construction process of assembling the dry joint segments and promoting the construction industry of bridges in China and the like, and the pier assembled by the dry joint unbonded prestress segments is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pier is assembled to dry joint unbonded prestressing force segment to propose current segment assembly pier engineering example and adopt the wet joint segment section to assemble technology in solving above-mentioned background art, the internal engineering example of assembling the dry joint segment is less with the research, and to the less problem of the practical application of dry joint pier.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a pier is assembled to no bonding prestressing force segment of joint seam futilely, includes pier body vertical atress reinforcing bar, hollow cross section, pier body stirrup and prefabricated pier of assembling, the prefabricated pier of assembling includes bent cap, prefabricated segment pier body and cushion cap, prefabricated segment pier body is provided with four sections, four prefabricated segment pier body is prestressed reinforcement concrete structure, the quantity of pier is assembled in the prefabrication is four, four the outside of prefabricated segment pier body all is provided with prestressed steel strand wires.

Preferably, two ends of the prestressed steel strand penetrate through the cover beam and the bearing platform respectively.

Preferably, the bottom of the bearing platform is provided with a groove, and the bottom of the groove penetrates through the lower surface of the bearing platform.

Preferably, prefabricated segment pier body, pier body vertical atress reinforcing bar and pier body stirrup all pour through concrete an organic whole and form.

Preferably, the two sides of the bearing platform, the capping beam and the prefabricated section pier body are fixedly connected through prestressed steel strands.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the dry-joint unbonded prestressed section assembled pier is formed by pouring in a factory in advance, can be assembled and molded in a short time on a construction site, and greatly shortens the construction period.

2. When the dry-joint unbonded prestressed segment assembled pier is assembled on site, a building site can be effectively utilized, and the purposes of reducing the construction operation area and reducing the influence on the surrounding environment and traffic are achieved.

3. The dry-joint unbonded prestressed segment assembled pier is manufactured by a factory by adopting a prefabricated assembly technology, and compared with a reinforced concrete structure which is cast in situ in the existing building industry, the dry-joint unbonded prestressed segment assembled pier can greatly improve the construction quality and ensure the quality and the structural safety of a building structure.

4. The dry joint prestress post-tensioning method technology adopted by the dry joint unbonded prestress section assembled pier can improve the self-resetting capability of the structure, reduce the residual displacement of the structure and ensure the safety of the structure.

5. The dry joint prestress post-tensioning method technology adopted by the dry joint unbonded prestress segment assembled bridge pier divides the structure into four prefabricated assembled bridge piers from the whole, so that the damage degree of the structure can be reduced to the maximum degree, and the good earthquake resistance of the structure is ensured.

Drawings

FIG. 1 is a schematic structural diagram of the main components of the present invention;

fig. 2 is a schematic view of the vertical structure of the dry-joint unbonded prestressed segment-assembled pier of the present invention;

fig. 3 is the utility model discloses a dry joint does not have prefabricated segment pier shaft plane sketch map of bonding prestressing force segment section assembly pier.

In the figure: 1. a capping beam; 2. pre-stressed steel strands; 3. prefabricating a section pier body; 4. a bearing platform; 5. a groove; 6. longitudinal stress steel bars of pier bodies; 7. a hollow section; 8. pier shaft stirrup.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a pier is assembled to no bondn prestressing force segment of joint futilely, including pier shaft vertical atress reinforcing bar 6, hollow cross section 7, pier shaft stirrup 8 and prefabricated pier of assembling, the prefabricated pier of assembling includes bent cap 1, prefabricated segment pier shaft 3 and cushion cap 4, prefabricated segment pier shaft 3 is provided with four segments, four prefabricated segment pier shafts 3 are prestressed reinforced concrete structure, the quantity of pier is assembled in the prefabrication is four, the outside of four prefabricated segment pier shafts 3 all is provided with prestressed wire 2, be used for the anchor, the prestressing force is drawn, prestressed wire 2 adopts unilateral stretch-draw, draw the end at bent cap 1 top.

Specifically, two ends of the prestressed steel strand 2 penetrate through the cover beam 1 and the bearing platform 4 respectively and are used for later-stage on-site assembling and prestressed tensioning.

Specifically, the bottom of the bearing platform 4 is provided with a groove 5, and the bottom of the groove 5 penetrates through the lower surface of the bearing platform 4, so that the anchoring purpose of the prestressed steel strand 2 is realized.

Specifically, prefabricated section pier shaft 3, pier shaft vertical stress reinforcing bar 6 and pier shaft stirrup 8 are all poured through concrete an organic whole and are formed, convenient subsequent assembling.

Specifically, both sides of the bearing platform 4, the bent cap 1 and the prefabricated section pier body 3 are fixedly connected through the prestressed steel strands 2, and construction time can be greatly shortened.

Wherein, the capping beam 1 and the bearing platform 4 both adopt common reinforced concrete structures, and the concrete strength grade is more than C50; the prestressed steel strand 2 is a steel strand with non-bonding performance higher than s 15.2; the prefabricated section pier body 3, the pier body longitudinal stress steel bar 6 and the pier body stirrup 8 all meet HRB 400-level steel bars.

The manufacturing and mounting steps of the test piece are as follows:

firstly, a bent cap 1, a cushion cap 4 and a prefabricated segment pier body 3 are poured in a factory in advance, and a common reinforced concrete structure is adopted;

then, the prestressed steel strand 2 penetrates to the bottom of a bearing platform 4 through a cover beam 1, and a groove 5 is reserved at the bottom of the bearing platform 4 so as to facilitate anchoring measures of the prestressed steel strand 2;

then, assembling the bent cap 1, the prefabricated section pier body 3 and the bearing platform 4 on a construction site according to the sequence from bottom to top, wherein epoxy resin cement glue is used as a covering layer at each section joint of the pier, a 'glue joint' is formed at the section joint, and the bent cap can be directly put into use in a dry joint mode without adopting cement glue;

and finally, after the bent cap 1, the prefabricated section pier body 3 and the bearing platform 4 are assembled, anchoring the prestressed steel strand 2 at the bottom of the bearing platform 4, and performing single-side tensioning on the prestressed steel strand 2 at the top of the bent cap 1.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a pier is assembled to dry joint unbonded prestressing force segment, includes pier body vertical atress reinforcing bar (6), hollow section (7), pier body stirrup (8) and prefabricated pier of assembling, its characterized in that: the prefabricated pier of assembling includes bent cap (1), prefabricated segment pier shaft (3) and cushion cap (4), prefabricated segment pier shaft (3) are provided with four sections, four prefabricated segment pier shaft (3) are prestressed reinforced concrete structure, the quantity of pier is assembled in the prefabrication is four, four the outside of prefabricated segment pier shaft (3) all is provided with prestressed steel strand wires (2).

2. The dry-joint unbonded prestressed segment assembled pier of claim 1, wherein: and two ends of the prestressed steel strand (2) respectively penetrate through the cover beam (1) and the bearing platform (4).

3. The dry-joint unbonded prestressed segment assembled pier of claim 1, wherein: the bottom of the bearing platform (4) is provided with a groove (5), and the bottom of the groove (5) penetrates through the lower surface of the bearing platform (4).

4. The dry-joint unbonded prestressed segment assembled pier of claim 1, wherein: the prefabricated section pier body (3), the pier body longitudinal stress steel bars (6) and the pier body stirrups (8) are all formed by integrally pouring concrete.

5. The dry-joint unbonded prestressed segment assembled pier of claim 1, wherein: the two sides of the bearing platform (4), the bent cap (1) and the prefabricated section pier body (3) are fixedly connected through prestressed steel strands (2).