CN111188258A

CN111188258A - Novel assembled bridge substructure

Info

Publication number: CN111188258A
Application number: CN202010095954.0A
Authority: CN
Inventors: 王燕; 李海洋; 王闪; 孙东生; 叶洪波; 王一光; 赵战涛; 张斐; 王宗磊; 穆勇攀; 冯旭; 侯克鹏; 刘树兵; 孟斌
Original assignee: Henan Provincial Communication Planning and Design Institute Co Ltd
Current assignee: Henan Provincial Communication Planning and Design Institute Co Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2020-05-22

Abstract

The invention discloses a novel fabricated bridge substructure, which comprises a pier upright post consisting of a section steel upright post inner core and a concrete reinforcing layer poured around the section steel upright post inner core, wherein the top of the inner core extends to the outside of the concrete reinforcing layer to form a top socket section, and the bottom of the inner core extends to the outside of the concrete reinforcing layer to form a bottom socket section; a pier cap is arranged on the bent cap, and a top socket slot matched with the top socket section is formed in the pier cap; the bearing platform is of a cast-in-place reinforced concrete structure, and is provided with a bottom socket slot matched with the bottom socket section; the pouring reinforcing layer is a high-strength non-shrinkage cement grouting material layer poured in a top inserting joint formed by the top inserting section and the top inserting groove and a bottom inserting joint formed by the bottom inserting section and the bottom inserting groove. According to the invention, the socket joint sections of the inner core of the large-size section steel stand column are respectively in socket joint connection with the capping beam and the bearing platform, so that the construction precision requirement is reduced, the construction process is simplified, and the construction period is greatly shortened.

Description

Novel assembled bridge substructure

Technical Field

The invention relates to the technical field of bridge construction, in particular to a novel assembled bridge substructure.

Background

The bridge lower structure is used for supporting the bridge upper structure and safely transmitting the load transmitted by the upper structure to the foundation so as to achieve the purpose of common stress. The traditional construction mostly adopts a cast-in-place reinforced concrete construction process, a bracket needs to be erected on a construction site, and the influence on traffic passing of peripheral roads is large; the cast-in-place reinforced concrete structure needs to be maintained in the later period, so that the construction period is long; the overall standardization degree is low, the quality controllability is poor, and the requirements of green and civilized construction cannot be met. In order to overcome the defects, scholars at home and abroad propose a technical route adopting assembly type construction, which mainly comprises the following steps: the prefabricated bridge lower part structure form connected by bonded post-tensioned prestressed tendons, the prefabricated bridge lower part structure form connected by steel bars through welding or lapping and adopting wet seams, the prefabricated bridge lower part structure form connected by grouting sleeves and the like.

The prefabricated bridge lower part structural form connected by the bonded post-tensioned prestressed tendons shown in figure 1a is that the prefabricated reinforced concrete pier bodies are connected into a whole through the post-tensioned prestressed tendons J, and in order to ensure the durability of joints, the joints of pier columns are bonded by epoxy resin. The fabricated bridge substructure, which is welded or overlapped by the steel bars and connected by wet joints as shown in fig. 1b, is in a structure that a part of the steel bars of the prefabricated reinforced concrete member are extended, and the extended steel bars J1 are connected with the reserved steel bars J2 of the adjacent prefabricated reinforced concrete member. The lower structure form of the assembled bridge connected by the grouting sleeves shown in fig. 1c is that ribbed steel bars J3 are inserted into the grouting sleeves T pre-embedded in concrete members, and grouting materials are injected into the sleeves from the outside of the prefabricated members through grouting pipes on a hoisting installation site to complete the connection of the prefabricated member steel bars.

Disclosure of Invention

In order to solve the problems, the invention provides a novel assembly type bridge lower part structure with the characteristics of component standardization, construction rapidness and environmental protection, and the following technical scheme can be adopted:

the novel assembled bridge lower part structure comprises

The pier upright column comprises a section steel upright column inner core and a concrete reinforcing layer poured around the section steel upright column inner core, wherein the top of the section steel upright column inner core extends to the outside of the concrete reinforcing layer to form a top socket section, and the bottom of the section steel upright column inner core extends to the outside of the concrete reinforcing layer to form a bottom socket section;

the capping beam is of a common reinforced concrete structure or a prestressed reinforced concrete structure, a pier cap is arranged on the capping beam, and a top socket slot matched with the top socket section is formed in the pier cap;

the bearing platform is of a cast-in-place reinforced concrete structure, and a bottom socket slot matched with the bottom socket section is formed in the bearing platform;

and the pouring reinforcing layer is a high-strength non-shrinkage cement grouting material layer poured in a top inserting joint formed by the top inserting section and the top inserting groove and a bottom inserting joint formed by the bottom inserting section and the bottom inserting groove.

The steel column inner core comprises steel webs welded into a cross structure, and the end face of each steel web is welded with a flange plate perpendicular to the steel web; the cross section of the concrete reinforcing layer is of a square structure.

The inner core of the profile steel upright post is a cylindrical steel plate, and the cross section of the concrete reinforcing layer is of a circular structure.

Shear nails are arranged on the top socket section and the bottom socket section of the profile steel upright post inner core.

Vertical bars and stirrups are arranged in the concrete reinforcing layer and the pier caps.

The novel assembly type bridge lower part structure provided by the invention has the advantages that the stress performance of the pier upright post is good, the bearing capacity is high, the section size of the prefabricated pier upright post component can be optimized and reduced, and the hoisting weight of the prefabricated component is reduced; the socket joint sections of the inner cores of the large-size section steel stand columns are respectively in socket joint connection with the capping beam and the bearing platform, so that the construction precision requirement is reduced, and the construction process is simplified; meanwhile, when the components are connected, prestressed tendons do not need to be adopted for connection, a prestressed tensioning grouting process does not exist, a reinforced concrete wet segment does not need to be arranged, and wet joint-free operation is adopted, so that the construction period is greatly shortened.

Drawings

Fig. 1a, 1b, 1c are schematic views of the assembly of a lower structure of a conventional assembled bridge.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a sectional view taken along line a-a in fig. 2.

Fig. 4a, 4B are cross-sectional views B-B in fig. 2.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 2, the novel assembly type bridge substructure of the present invention is composed of pier columns, capping beams and bearing platforms which adopt a socket and spigot structure. Specifically, the pier column comprises a section steel column inner core 1.1 and a concrete reinforcing layer 1.2 poured around the section steel column inner core, wherein the top of the section steel column inner core 1.1 extends to the outside of the concrete reinforcing layer 1.2 to form a top socket section 1.3, and the bottom of the section steel column inner core 1.1 extends to the outside of the concrete reinforcing layer 1.2 to form a bottom socket section 1.4; the bent cap 2.1 is of a common reinforced concrete structure or a prestressed reinforced concrete structure, a pier cap 2.2 is arranged on the bent cap, and a top socket 2.3 matched with the top socket section 1.3 is arranged in the pier cap 2.2; the bearing platform 3.1 is a cast-in-place reinforced concrete structure, and is provided with a bottom socket 3.2 matched with the bottom socket section 1.4. The lengths and the cross section sizes of the top socket section 1.3 and the bottom socket section 1.4 are determined according to the stress condition of the pier column. After the top socket section 1.3 and the top socket groove 2.3 and the bottom socket section 1.4 and the bottom socket groove 3.2 are inserted, high-strength non-shrinkage cement grouting material is poured into the formed top socket joint and the formed bottom socket joint to be used as a pouring reinforcing layer, so that the prefabricated components are effectively connected.

As shown in fig. 3, the steel web plates 1.1a welded into a cross structure can be adopted as the steel column core 1.1, and flange plates 1.1b perpendicular to the steel web plates 1.1a are welded on the end surfaces of the steel web plates 1.1a respectively; the concrete reinforcement layer 1.2 has a square cross-section (see fig. 4 a). The steel section column inner core 1.1 can also simply adopt a cylindrical steel plate 1.1c, and the cross section of the concrete reinforced layer 1.2 is of a circular structure (see figure 4 b). The steel web 1.1a, the flange plate 1.1b and the cylindrical steel plate 1.1c are all made of standard steel. In order to enhance the connection stability of the steel column inner core 1.1, the cover beam 2.1 and the bearing platform 3.1, shear nails 1.5 are welded on steel plates forming the top socket section 1.3 and the bottom socket section 1.4. In the former steel column core 1.1, the shear pins 1.5 are only welded to the flange plate 1.1 b. In order to improve the bearing performance of the whole structure, vertical ribs 1.5 and stirrups 1.6 are arranged in the concrete reinforcing layer 1.2 and the pier cap 2.2, and are prefabricated with the pier columns and the capping beam at the same time.

Compared with the prior art, the invention has the following advantages:

1. when the prefabricated parts are connected, a cast-in-place reinforced concrete wet joint section structure is not required to be arranged, and high-degree assembly prefabrication can be realized, so that the advantages of rapidness, standardization, green environmental protection and the like of lower structure construction are kept;

2. the prefabricated pier column adopts a prefabricated section steel concrete structure, the prefabricated pier column is a combined structure formed by a section steel column inner core and a concrete reinforcing layer poured around the section steel column inner core, when the prefabricated pier column is used as a pressure-bearing member, the weakness of instability of a common steel structure framework under pressure is overcome due to the constraint action of concrete around section steel, the stress performance is good, meanwhile, the bearing capacity of the section steel concrete column is more than 1 time higher than that of a reinforced concrete column with the same section size, and the prefabricated pier column has the characteristic of high bearing capacity;

3. the section steel concrete pier column has the characteristics of good stress performance and high bearing capacity, and the prefabricated section steel concrete pier column has the advantages of small section size and light hoisting weight of prefabricated parts under the condition of needing to have considerable bearing capacity;

4. the prefabricated component connection mode has the advantages of single construction form, good integrity, larger cross section size of a socket slot insertion hole, convenience in hoisting and positioning, simplicity and convenience in construction process and the like.

Claims

1. The utility model provides a novel assembled bridge substructure which characterized in that: comprises that

2. The novel assembled bridge substructure of claim 1, wherein: the steel column inner core comprises steel webs welded into a cross structure, and the end face of each steel web is welded with a flange plate perpendicular to the steel web; the cross section of the concrete reinforcing layer is of a square structure.

3. The novel assembled bridge substructure of claim 1, wherein: the inner core of the profile steel upright post is a cylindrical steel plate, and the cross section of the concrete reinforcing layer is of a circular structure.

4. The novel assembled bridge substructure of claim 1, wherein: shear nails are arranged on the top socket section and the bottom socket section of the profile steel upright post inner core.

5. The novel assembled bridge substructure of claim 1, wherein: vertical bars and stirrups are arranged in the concrete reinforcing layer and the pier caps.