CN101818478B - Connection structure for concrete-filled circular steel tubular pier column and concrete cover beam - Google Patents

Abstract

The invention discloses a connection structure between a circular steel pipe concrete pier column and a concrete cover beam, comprising an inverted T-shaped steel beam, a concrete cover beam, and a circular steel pipe concrete pier column, and the inverted T-shaped steel beam is pre-embedded in the concrete cover beam The lower end of the lower end is characterized in that: it also includes a steel pipe cover plate and a rivet bar with a nut, the steel pipe cover plate is welded to the upper end of the circular steel pipe concrete pier column, and the opening of the inverted T-shaped steel beam web plate is connected to the concrete connection, the T-shaped steel beam flange plate is fixedly connected to the steel pipe cover plate through the rivet bar with a nut, and the two ends of the rivet bar with a nut go deep into the concrete cover beam and the steel tube concrete pier. The present invention does not require complicated reinforcing bar arrangement, and all components can be processed in the factory and assembled on site. Only the triangular support steel plate and the steel pipe cover plate need to be welded on site, the welding workload is small, and the force transmission path is clear. When implemented, the construction is simple and fast.

Description

The Connection Structure of Circular Concrete Steel Tube Concrete Pier Column and Concrete Cover Beam

technical field

The invention relates to the connection of pier structures in bridge engineering, in particular to the connection of circular steel tube concrete pier columns and concrete cover beams.

Background technique

Concrete bridge piers have a large cross-sectional area and require a large amount of road space, which cannot meet the increasingly busy urban traffic needs. However, the amount of steel used for steel piers is too large, and the cost is high. Combining the respective advantages of steel and concrete, CFST is an ideal bridge pier structure with small cross-sectional area, low cost, high bearing capacity, good ductility, and construction without formwork. Concrete filled steel tubes are used for the pier columns of urban bridges, and reinforced concrete is still used for the bridge pier cover beams, which meets the needs of space and force, and the cost can be controlled within a reasonable range.

Compared with square concrete-filled steel tube concrete, the steel tube wall has a better restraint effect on the core concrete, and is more suitable for application in bridge piers. However, the surface of the round steel pipe is arc-shaped, which is inconvenient to weld, and the joint connection processing is more complicated. Therefore, it is particularly important to connect the circular concrete-filled steel pipe concrete pier column and the concrete cap beam joint with a simple structure, clear force transmission, and safety and reliability.

At present, research reports on the joint connection between circular steel pipe concrete columns and concrete beams are mainly aimed at beam-column joints in construction projects. The force of bridge pier joints is complex, and the form of beam-column joints in construction engineering cannot be applied to bridge pier joints. The literature search shows that there is no report on the structural design of the connection structure between the circular concrete-filled steel pipe concrete piers and the concrete cap-beam joints.

Contents of the invention

The invention relates to a connection structure design of a steel pipe concrete pier column and a concrete cover beam, the purpose of which is to improve the overall shear and flexural bearing capacity of the bridge pier joints of the steel pipe concrete-concrete composite structure, and to ensure that the circular steel pipe concrete pier column and the concrete cover beam work together.

The present invention is achieved through the following technical solutions:

A connection structure between a circular steel pipe concrete pier column and a concrete cover beam, comprising an inverted T-shaped steel beam, a concrete cover beam, and a steel pipe concrete pier column. The inverted T-shaped steel beam is pre-buried at the lower end of the concrete cover beam, and its characteristics In that: it also includes a steel pipe cover plate and an anchor bar with a nut, the steel pipe cover plate is welded to the upper end of the steel pipe concrete pier column, and the T-shaped steel beam flange plate passes through the anchor bar with a nut and the steel pipe The cover plate is fixedly connected.

The web plate of the T-shaped steel girder is opened to be effectively connected with the concrete cover girder. A triangular support steel plate is arranged between the lower end of the flange plate of the T-shaped steel beam and the outer wall of the steel pipe concrete pier column, and the triangular support steel plate is welded and connected with the lower end of the flange plate of the T-shaped steel beam and the outer wall of the concrete-filled steel pipe pier column to ensure the strength reliable transmission.

There are six triangular support steel plates, which are symmetrically fan-shaped and distributed on both sides of the steel pipe concrete piers.

The two ends of the anchor bar of the anchor bars with nuts extend into the concrete cover beam and the steel pipe concrete pier respectively to play an anchoring role.

Advantages of the present invention:

First, there is no need for complicated reinforcement arrangement, and all components can be processed in the factory and assembled on site. Only the triangular support steel plate and the steel pipe cover plate need to be welded on site, and the welding workload is small. When implemented, the construction is simple and fast.

Second, the structural force is reasonable and the force transmission path is clear. The inverted T-beam can ensure that the longitudinal shear force and bending moment are effectively transmitted to the top surface of the pier column. The anchor nut ensures the effective connection between the steel pipe cover plate and the inverted T-beam. The anchor bar extends into the pier column and the cover beam to ensure the transverse Efficient transmission of bending moments. The setting of the steel pipe cover plate and the triangular support steel plate makes the upper force evenly distributed on the section of the pier column, preventing local excessive compression and stress concentration.

Third, a variety of connection measures ensure the overall operation of the nodes, which can be flexibly selected according to the actual bearing capacity needs. Web openings and rivets can ensure the effective connection between the concrete cover and the inverted T-beam, and the bolts on the triangular support steel plate and the anchor bars can ensure the effective connection between the inverted T-beam and the concrete filled steel pipe pier. At the same time, the anchor bar of the anchor bar extends into the interior of the upper and lower concrete, so that the upper and lower concrete are connected as a whole.

Description of drawings

Figure 1 Elevation view of connection structure.

Figure 2 Plane view of connection structure.

Detailed ways

The composition of the connection structure of the present invention is mainly composed of open-hole web plate inverted T-shaped steel beam 1, rivet 2, anchor bar 3 with nut, triangular support steel plate 4, steel pipe cover plate 5, concrete cover beam 6, steel pipe concrete pier column 7 composition. Its main features are as follows: First, the concrete cover beam 6 and the inverted T-shaped steel beam 1 can be effectively connected by welding the rivets 2 on the web and flange of the hole, and the arrangement of the holes and rivets is determined according to the specific bearing capacity requirements. The second is that the steel pipe cover plate 5 is welded to the steel pipe concrete pier column 7, and the steel pipe cover plate 5 and the flange of the inverted T-shaped steel beam 1 are connected through the anchor bar 3 bolts with nuts, and the anchor bar extends into the concrete of the steel tube concrete pier column 7 And in the concrete cover beam 6, the number of anchor bars 3 and the thickness of the cover plate are determined according to the size of the concrete-filled steel pipe pier and the specific load-bearing requirements. The third is that three triangular support steel plates 4 are welded between the steel pipe wall of the steel pipe concrete pier column 7 and the flange of the inverted T-shaped steel beam 1, which are distributed in a fan shape to relieve the stress concentration at the contact position between the flange of the steel beam 1 and the steel pipe 7, and at the same time The connection between the steel pipe concrete pier column 7 and the inverted T-shaped steel beam 1 is strengthened to make up for the insufficient welding bearing capacity that may occur between the steel pipe cover plate 5 and the steel pipe concrete pier column 7 .

Firstly, the inverted T-beam 1 of the perforated web, the triangular support steel plate 4, and the steel pipe cover plate 5 are processed in the factory, and the rivet 2 is welded on the inverted T-beam, and the lower nut of the anchor bar 3 with the nut is connected with the The steel pipe cover plate 5 is fixed; the steel pipe concrete pier column 7 is poured on site, the steel cover plate 5 is welded to the steel pipe concrete pier column 7, and the inverted T-beam 1 and the steel pipe cover plate 5 are connected with the anchor bar 3; the triangular support steel plate 4 is welded; pouring Concrete cap beams.

Claims (5)

1. the syndeton of concrete filled steel tube pier stud and concrete bent cap; Comprise inverted T shape girder steel (1), concrete bent cap (6); Concrete filled steel tube pier stud (7); Described inverted T shape girder steel (1) is embedded in the lower end of concrete bent cap (6); It is characterized in that: also comprise the dowel (3) of steel pipe cover plate (5), band nut, described steel pipe cover plate (5) welds with the upper end of concrete filled steel tube pier stud (7), and described inverted T shape girder steel (1) frange plate is fixedly connected with steel deck-plate (5) through the dowel (3) of described band nut.

2. the syndeton of concrete filled steel tube pier stud according to claim 1 and concrete bent cap is characterized in that: between the outer wall of steel pipe of described inverted T shape girder steel (1) frange plate lower end and described concrete filled steel tube pier stud (7), be provided with gusseted steel plate (4).

3. the syndeton of concrete filled steel tube pier stud according to claim 2 and concrete bent cap is characterized in that: described gusseted steel plate (4) is six, and symmetry is the fan-shaped both sides that are distributed in concrete filled steel tube pier stud (7).

4. the syndeton of concrete filled steel tube pier stud according to claim 1 and concrete bent cap is characterized in that: the anchor pole two ends of the dowel of described band nut (3) are stretched into concrete bent cap (6) and concrete filled steel tube pier stud (7) inside respectively.

5. the syndeton of concrete filled steel tube pier stud according to claim 1 and concrete bent cap is characterized in that: the web of described inverted T shape girder steel (1) is provided with the hole, on the frange plate of inverted T shape girder steel (1), welds rivet (2).

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