CN110184903B - A truss-type prefabricated pipe column assembled bridge pier - Google Patents

Abstract

The invention belongs to the technical field of bridge engineering, and particularly relates to a truss type prefabricated pipe column spliced pier, which comprises two pile foundations and two prefabricated pipe columns arranged at intervals along the width direction of a main beam; the tops of the two pile foundations are respectively provided with an enlarged pile head; the bottoms of the two prefabricated pipe columns are respectively connected with the two enlarged pile heads, and the tops of the two prefabricated pipe columns are fixedly connected with the main beam; the two prefabricated pipe columns are connected through a connecting system. The truss type precast tubular column spliced pier provided by the invention forms a truss structure through the precast tubular columns and the connecting system, replaces the traditional concrete pier with the precast truss, avoids a great amount of construction procedures of on-site cast-in-place concrete, lightens the pier, simplifies the structure on the premise of meeting the stress of the structure, and is convenient for transportation and installation of prefabricated members; the pier beam connection mode is simplified, and vulnerable parts such as a support and the like are reduced or avoided; and the bottom of the prefabricated pipe column is connected with the pile foundation into a whole through the enlarged pile head, so that a special excavation bearing platform is not needed, and the land is saved.

Description

A truss-type prefabricated pipe column assembled bridge pier

Technical Field

The invention belongs to the technical field of bridge engineering, and in particular relates to a truss-type prefabricated pipe column assembled bridge pier.

Background Art

Traditional urban bridges mostly use reinforced concrete piers, which are divided into rectangular piers, round-end piers, single-column piers, double-column piers or portal piers. The top of the pier is equipped with a pier cap, a cushion stone, and a support connected to the main beam, and the bottom of the pier is connected to the pile foundation through a cap. Traditional concrete piers are cast-in-place, and a large number of scaffoldings need to be set up on the construction site. Important processes such as steel bar binding and concrete pouring must be completed through scaffolding, which is a challenge to the stability and safety of the scaffolding; second, on-site operations require a large amount of labor, low construction efficiency, and a long construction period. It has a great impact on existing road traffic and a large social impact, and civilized construction is difficult to meet the requirements of the public; third, there is a permanent cap under the pier, especially for soft soil areas, a large amount of excavation is required, which is difficult to meet environmental protection requirements.

The prefabricated construction of bridge piers is the development trend of urban bridges. Prefabricated concrete piers are prefabricated in sections and then assembled and connected into an integral structure. At present, the connection methods of prefabricated piers include prestressed tendons, grouting sleeves, mechanical sleeves, welding, etc. For example, the main bridge piers of the Taipa Bridge in Macau use multi-layer I-shaped reinforced concrete prefabricated blocks as the main body of the pier body, and the high-strength prestressed steel bars passing through the pier body and the pier top crossbeam are tensioned and anchored to connect the pier body and the pile foundation pedestal into one; the Hong Kong-Zhuhai-Macao Bridge uses a technology that combines segment tensioning prestressed steel bars and segment connection ordinary steel bars; the prefabricated piers of Shanghai municipal bridges use grouting sleeve connection technology; the prefabricated piers of highway bridges in Anhui Province use the cup-mouth wet joint connection method. Connection technology is the core technology of prefabricated bridge piers. The connection of longitudinal steel bars, as the key to prefabricated construction, cannot be handled by conventional binding, lap joints, welding, and mechanical connections. In addition, the assembly parts often coincide with the most unfavorable stress-bearing parts of the structure, causing the splicing parts to become vulnerable parts and weak links of prefabricated bridge piers, which places high requirements on factory prefabrication and on-site construction.

As an important part of the bridge, the quality of its design is directly related to the overall beauty of the bridge. Traditional concrete bridge piers can be divided into solid piers, hollow piers, column piers, frame piers, etc. The concrete itself has a dull texture and a large volume, becoming an important unit that affects the vision of pedestrians and vehicles. The space under the bridge easily gives people a feeling of depression and dullness, which cannot be ignored.

Bridge bearings are important structural components that connect the upper and lower structures of bridges. They are located between the main beam and the pier top pad stone and are important force transmission devices of bridges. Common bearing forms used in bridge engineering include flat plate bearings, plate rubber bearings, spherical bearings, steel bearings and special bearings. The quality of the bearing is a key factor affecting the overall quality of the bridge. At present, typical diseases of urban bridge bearings include: bearing aging, hollowing, cheapness, uneven force, damage to the limit device, failure of the slide bearing, and filling mortar cracks. The installation steps of the bearing are relatively complicated. Taking the railway basin-type rubber bearing as an example, for the cast-in-place main beam, the bearing is generally placed in the corresponding position according to the design requirements, and temporary support is used during construction. When the construction is switched to the system, the temporary support is removed so that the beam falls on the permanent support; for the bridge with prefabricated and hoisted main beams, only one of the upper and lower seat plates of the bearing can be fixed first, and the upper seat plate is usually fixed on the beam, and then according to the hoisting situation of the main beam, the position of the bottom basin on the pier support pad stone is finally adjusted and finally fixed.

Summary of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a truss-type prefabricated pipe column assembled bridge pier, which can avoid a large number of on-site cast-in-place concrete procedures and make the bridge pier lightweight and simple in structure while meeting the structural stress requirements.

To achieve the above-mentioned purpose, the technical solution of the present invention is a truss-type prefabricated pipe column assembled bridge pier, comprising two pile foundations and two prefabricated pipe columns arranged at intervals along the width direction of the main beam; the tops of the two pile foundations are provided with enlarged pile heads; the bottoms of the two prefabricated pipe columns are respectively connected to the two enlarged pile heads, and the tops of the two prefabricated pipe columns are used for fixed connection with the main beam; the two prefabricated pipe columns are connected by a connecting system.

Furthermore, the top of the prefabricated pipe column is sealed by a pier top plate, the pier top plate is used to be fixedly connected to the bottom plate of the main beam, the prefabricated pipe column is connected to the pier top plate, and is reinforced by a pier top reinforcing corbel.

Furthermore, the top plate of the pier is provided with a first bolt hole for passing a first bolt pre-buried in the bottom plate of the main beam.

Furthermore, the top of the prefabricated pipe column is used to be fixedly connected to the embedded steel pipe embedded in the bottom plate of the main beam.

Furthermore, the bottom of the prefabricated pipe column is sealed by a pier bottom end plate, the pier bottom end plate is connected to the top of the enlarged pile head, the prefabricated pipe column is connected to the pier bottom end plate, and is reinforced by a pier bottom reinforcing corbel.

Furthermore, a second bolt is pre-embedded in the enlarged pile head, and a second bolt hole is provided on the pier bottom end plate at a position corresponding to the second bolt, and the pier bottom end plate is fixed to the enlarged pile head by passing the second bolt through the corresponding second bolt hole.

Furthermore, a pre-buried steel pipe is pre-buried at the top of the enlarged pile head, and the bottom of the prefabricated pipe column is fixedly connected to the pre-buried steel pipe on the enlarged pile head.

Furthermore, the prefabricated pipe column includes a pier top section, a pier bottom section and a plurality of intermediate sections arranged between the pier top section and the pier bottom section, the pier top section is connected to the bottom plate of the main beam, and the pier bottom section is connected to the enlarged pile head.

Furthermore, the connection system includes a plurality of connecting steel pipes, and both ends of each connecting steel pipe are respectively connected to two prefabricated pipe columns.

Furthermore, concrete is poured into the prefabricated pipe column.

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

(1) The truss-type prefabricated pipe column assembled bridge pier provided by the present invention forms a truss structure through prefabricated pipe columns and connection systems, replacing the traditional concrete bridge pier with a prefabricated truss, avoiding the construction process of a large number of on-site cast-in-place concrete, facilitating large-scale flow operations, and thus greatly shortening the construction period; at the same time, the truss structure is adopted to make the bridge pier lightweight and simple in structure under the premise of meeting the structural stress, which is convenient for transportation and installation;

(2) The bottom of the prefabricated pipe column of the truss-type prefabricated pipe column pier provided by the present invention is connected to the pile foundation by enlarging the pile head, which does not require special excavation of the cap, especially for soft foundations, thus saving land use and having significant advantages in environmental protection and economy;

(3) The pier top of the truss-type prefabricated pipe column assembled bridge pier provided by the present invention can be connected to the bottom plate of the main beam or the embedded steel pipe by bolts or welding, eliminating the need for support installation and avoiding vulnerable parts such as supports;

(4) The truss-type prefabricated pipe column assembled bridge pier provided by the present invention forms a truss structure through prefabricated pipe columns and connection systems, thereby reducing the volume of the bridge pier and avoiding a large area of solid effect; increasing the lower space and reducing the visual sense of volume of the bridge pier;

(5) The truss-type prefabricated pipe column assembled bridge pier provided by the present invention can be designed in a standardized manner and manufactured in a factory with high precision. The segments can be reasonably divided according to the transportation conditions and on-site construction conditions, and then welded and assembled on-site, thereby reducing the longitudinal connection of the bridge pier and the interference with the existing traffic. Compared with the traditional construction method, the appearance and internal quality are guaranteed and improved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a cross-sectional schematic diagram of a truss-type prefabricated pipe column assembled bridge pier provided by an embodiment of the present invention;

FIG2 is a bridge elevation view of a truss-type prefabricated pipe column assembled bridge pier provided by an embodiment of the present invention;

FIG3 is a schematic diagram of the segment division of a truss-type prefabricated pipe column assembled bridge pier provided by an embodiment of the present invention;

FIG4 is a schematic diagram of the connection between the truss-type prefabricated pipe column assembled bridge pier and the steel main beam provided by an embodiment of the present invention;

FIG5 is a schematic diagram of the segment division of a truss-type prefabricated pipe column assembled bridge pier provided by an embodiment of the present invention;

FIG6 is a connection diagram of a truss-type prefabricated pipe column assembled bridge pier and a concrete main beam provided by an embodiment of the present invention;

FIG7 is a schematic diagram of the connection between the pier bottom section and the enlarged pile head of the truss-type prefabricated pipe column assembled bridge pier provided by an embodiment of the present invention;

FIG8 is a schematic diagram of a connection system for assembling bridge piers using truss-type prefabricated pipe columns according to an embodiment of the present invention;

FIG9 is a schematic diagram of a connection system for assembling bridge piers using truss-type prefabricated pipe columns according to an embodiment of the present invention;

FIG10 is a schematic diagram of a connection system for assembling bridge piers using truss-type prefabricated pipe columns according to an embodiment of the present invention;

FIG11 is a schematic diagram of a connection system for assembling bridge piers using truss-type prefabricated pipe columns according to an embodiment of the present invention;

In the figure: 1. prefabricated pipe column, 101. pier top section, 102. middle section, 103. pier bottom section, 2. enlarged pile head, 3. pile foundation, 4. connection system, 401. connecting steel pipe, 5. main beam, 6. beam joint, 7. embedded steel pipe, 8. pier top plate, 9. pier top reinforcing corbel, 10. first bolt, 11. pier bottom end plate, 12. pier bottom reinforcing corbel, 13. second bolt.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "several" means one or more, and "multiple" means two or more.

As shown in FIG1 , an embodiment of the present invention provides a truss-type prefabricated pipe column assembled bridge pier, comprising two pile foundations 3 and two prefabricated pipe columns 1 arranged at intervals along the width direction of the main beam 5; the tops of the two pile foundations 3 are each provided with an enlarged pile head 2; the prefabricated pipe column 1 is arranged on the ground; the bottoms of the two prefabricated pipe columns 1 are respectively connected to the two enlarged pile heads 2, and the tops of the two prefabricated pipe columns 1 are used for fixed connection with the bottom plate of the main beam 5; the two prefabricated pipe columns 1 are connected by a connection system 4. The bridge pier of this embodiment forms a truss structure through the prefabricated pipe columns 1 and the connection system 4, the two vertical prefabricated pipe columns 1 are load-bearing structures, and the connection system 4 is arranged between the prefabricated pipe columns 1 to ensure the overall stability of the bridge pier, avoiding the construction procedure of a large amount of on-site cast-in-place concrete, and greatly shortening the construction period; at the same time, under the premise of meeting the structural stress, the truss structure is adopted to make the bridge pier lightweight and simple in structure, which is convenient for transportation and installation.

As an implementation method, as shown in Figures 3 and 4, the top of the prefabricated pipe column 1 is sealed by a pier top plate 8, and the pier top plate 8 is used to be fixedly connected to the bottom plate of the main beam 5. The prefabricated pipe column 1 is connected to the pier top plate 8 and is stiffened by a pier top stiffening corbel 9. This implementation method is applicable when the main beam 5 is a steel main beam. After the top of the prefabricated pipe column 1 is sealed by the pier top plate 8, the pier top plate 8 can be welded and fixed to the bottom plate of the steel main beam by welding, or the pier top plate 8 can be fixed to the bottom plate of the steel main beam by high-strength bolts. A first bolt hole is set on the pier top plate 8, and a first bolt 10 is embedded at a position corresponding to the first bolt hole on the bottom plate of the steel main beam. The main beam 5 is fixed to the prefabricated pipe column 1 by passing the first bolt 10 through the corresponding first bolt hole; and the pier top plate 8 and the prefabricated pipe column 1 are reinforced by the pier top stiffening corbel 9.

As another implementation, as shown in Figures 5 and 6, the top of the prefabricated pipe column 1 is used to be fixedly connected to the embedded steel pipe 7 embedded in the bottom plate of the main beam 5. This implementation is applicable when the main beam 5 is a concrete main beam, and the embedded steel pipe 7 is embedded in the position corresponding to the two prefabricated pipe columns 1 on the bottom plate of the concrete main beam. After the pier top section is in place, it is welded or bolted to the top of the prefabricated pipe column 1 through the embedded steel pipe 7, and no support is required.

The top of the prefabricated pipe column 1 of the pier of this embodiment can be connected to the bottom plate of the main beam or the embedded steel pipe by welding or bolts, eliminating the need for support installation and avoiding vulnerable parts such as supports.

As an implementation mode, as shown in FIG7 , the bottom of the prefabricated pipe column 1 is sealed by a pier bottom end plate 11, the pier bottom end plate 11 is connected to the top of the enlarged pile head 2, the prefabricated pipe column 1 is connected to the pier bottom end plate 11, and is stiffened by a pier bottom stiffening corbel 12. Furthermore, a second bolt 13 is embedded in the enlarged pile head 2, and a second bolt hole is provided at a position corresponding to the second bolt 13 on the pier bottom end plate 11, and the pier bottom end plate 11 is fixed to the enlarged pile head 2 by passing the second bolt 13 through the corresponding second bolt hole. After the construction of the pile foundation 3 is completed, the pile head 3 is enlarged at the top of the pile, and the second bolt 13 is embedded in the top of the enlarged pile head 3, and the position of the second bolt 13 corresponds to the second bolt hole reserved on the pier bottom end plate 11. The pier bottom section 103 is connected to the pile foundation 3 as a whole by the second bolt 13, and the second bolt 13 can be an M30 anchor bolt. As another embodiment, a pre-buried steel pipe is pre-buried at the top of the enlarged pile head 2, and the bottom of the prefabricated pipe column 1 is welded and fixed to the pre-buried steel pipe on the enlarged pile head 2. The bottom of the prefabricated pipe column 1 of this embodiment can be connected to the enlarged pile head 2 through the pier bottom end plate 11, and can also be welded and fixed to the pre-buried steel pipe on the enlarged pile head 2, without the need to specially excavate the foundation, thus saving land use.

Furthermore, the prefabricated pipe column 1 includes a pier top section 101, a pier bottom section 103, and a plurality of intermediate sections 102 disposed between the pier top section 101 and the pier bottom section 103. The pier top section 101 is connected to the bottom plate of the main beam 5, and the pier bottom section 103 is connected to the enlarged pile head 2. The prefabricated pipe column 1 in this embodiment is manufactured in a factory, and is reasonably divided into sections according to transportation conditions and on-site construction conditions. After being prefabricated in the factory, each section of the prefabricated pipe column 1 and each connecting steel pipe 401 of the connecting system 4 are transported to the construction site in sequence for assembly and connection according to the construction organization arrangement, thereby reducing the connection of the longitudinal reinforcement of the pier and the interference with the existing traffic.

Further, the connection system 4 includes a plurality of connection steel pipes 401, and both ends of each connection steel pipe 401 are respectively connected to two prefabricated pipe columns 1. As shown in FIG8, the plurality of connection steel pipes 401 are arranged in a Z shape; as shown in FIG9, the plurality of connection steel pipes 401 are arranged in an X shape; as shown in FIG10, the plurality of connection steel pipes 401 are arranged in a V shape; as shown in FIG11, the plurality of connection steel pipes 401 are arranged in a straight line; the plurality of connection steel pipes 401 can adopt the above arrangement form or other arrangement forms to further improve the stability between the two prefabricated pipe columns 1.

The prefabricated pipe column 1 and the connecting steel pipe 401 in this embodiment can be made of round steel pipes or square steel pipes, and the pier top end plate 8 and the pier bottom end plate 11 can have the same shape as the prefabricated pipe column 1.

Furthermore, the prefabricated pipe column 1 of this embodiment may or may not be poured with concrete. As a preferred embodiment, concrete is poured into the prefabricated pipe column 1 to form a steel tube concrete structure to enhance the bearing capacity of the bridge pier; multiple grouting holes and multiple pouring holes can be set on the prefabricated pipe column 1 along the vertical direction, the grouting holes are set corresponding to the pouring holes, and the corresponding grouting holes are located above the pouring holes; the specific construction method is: after the prefabricated pipe column 1 is connected to the pile foundation 3 as a whole, concrete is poured into the prefabricated pipe column 1 through the pouring holes on site, and the initial setting time of the concrete should meet the time requirement of pumping the steel tube concrete to the top. After the concrete reaches the design strength, the top of the prefabricated pipe column 1 can be welded and closed through the pier top plate 8 and connected to the main beam 5.

Furthermore, the pile foundation 3 and the enlarged pile head 2 can both be arranged below the ground. In this embodiment, the bottom of the prefabricated pipe column is connected to the pile foundation through the enlarged pile head, and there is no need to specially excavate a cap, especially for soft foundations.

The prefabricated pipe column 1 arranged at the end of the main beam 5 is connected to the prefabricated pipe column 1 at the end of the main beam 5 adjacent thereto through the same enlarged pile head 2 and the same pile foundation 3. As shown in FIG2 , there is a beam gap 6 between two adjacent main beams 5, and the edge positions of the main beams 5 on both sides of the beam gap 6 are respectively provided with the bridge piers provided in this embodiment for support, and each pier corresponds to two prefabricated pipe columns 1, and one prefabricated pipe column 1 of each pier shares the same enlarged pile head 2 and the same pile foundation 3 with one prefabricated pipe column 1 of another pier, thereby further improving the assembly stability between the main beams 5.

The truss-type prefabricated pipe column assembly bridge pier provided in this embodiment can be applied to urban bridges, intercity railways, and rail transit, and can avoid the construction procedures of a large number of on-site cast-in-place concrete, and has many advantages such as assembly construction, land saving, engineering saving, and good economy. It overcomes the shortcomings of traditional concrete bridge pier construction sites that require a large number of brackets and templates, high safety risks, large labor requirements for on-site operations, low construction efficiency, long construction period, great impact on existing road traffic, large social impact, and civilized construction that is difficult to meet the requirements of the public. The truss-type prefabricated pipe column assembly bridge pier provided in this embodiment is used within a reasonable pier height range, with clear force, land saving, and reduced interference with existing traffic. The appearance and internal quality are both guaranteed and improved, and it has significant advantages in environmental protection and economy.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a pier is assembled to prefabricated tubular column of truss, its characterized in that: the device comprises two pile foundations and two prefabricated pipe columns which are sequentially arranged at intervals along the width direction of a main beam; the tops of the two pile foundations are respectively provided with an enlarged pile head; the bottoms of the two prefabricated pipe columns are respectively connected with the two enlarged pile heads, and the tops of the two prefabricated pipe columns are fixedly connected with the main beam; the two prefabricated pipe columns are connected through a connecting system; the bottom of the prefabricated pipe column is sealed through a pier bottom end plate, the pier bottom end plate is connected with the top of the enlarged pile head, and the prefabricated pipe column is connected with the pier bottom end plate and stiffened through pier bottom stiffening brackets; the connecting system comprises a plurality of connecting steel pipes, and two ends of each connecting steel pipe are respectively connected with two prefabricated pipe columns; the plurality of connecting steel pipes are arranged in a Z shape or in an X shape or in a V shape or in a straight shape; the prefabricated pipe column arranged at the end part of the main beam is connected with the prefabricated pipe column at the end part of the main beam adjacent to the prefabricated pipe column through the same enlarged pile head and the same pile foundation.

2. The truss type precast column spliced pier according to claim 1, wherein: the top of prefabricated tubular column is sealed through the mound top end plate, mound top end plate is used for the bottom plate fixed connection with the girder, prefabricated tubular column with mound top end plate is connected to through mound top stiffening bracket stiffening.

3. The truss type precast column spliced pier according to claim 2, wherein: the pier top end plate is provided with a first bolt hole for a first bolt pre-buried on the main beam bottom plate to pass through.

4. The truss type precast column spliced pier according to claim 1, wherein: the top of the prefabricated pipe column is used for being fixedly connected with an embedded steel pipe embedded in the main beam bottom plate.

5. The truss type precast column spliced pier according to claim 1, wherein: the second bolt is embedded in the enlarged pile head, a second bolt hole is formed in the pier bottom end plate at a position corresponding to the second bolt, and the pier bottom end plate is fixed with the enlarged pile head through the second bolt hole corresponding to the second bolt hole.

6. A truss type prefabricated pipe column spliced pier according to any one of claims 1 to 4, wherein: the top of the expansion pile head is embedded with an embedded steel pipe, and the bottom of the prefabricated pipe column is fixedly connected with the embedded steel pipe on the expansion pile head.

7. The truss type precast column spliced pier according to claim 1, wherein: the prefabricated pipe column comprises a pier top section, a pier bottom section and a plurality of intermediate sections arranged between the pier top section and the pier bottom section, wherein the pier top section is connected with a bottom plate of the girder, and the pier bottom section is connected with the enlarged pile head.

8. The truss type precast column spliced pier according to claim 1, wherein: and concrete is poured into the prefabricated pipe column.