CN206941372U - Concrete-filled steel tube with dumbbell sections assembled pier and the attachment structure with cushion cap - Google Patents

Abstract

The utility model discloses a dumbbell-shaped steel pipe concrete composite bridge pier and its connection structure with the bearing platform. It is a dumbbell-shaped steel pipe that is symmetrical along the line connecting the centroids of two round steel pipes, and the double-layer steel plate and the round steel pipe are welded by fillet welds. The bottom of the dumbbell-shaped steel pipe is welded with an end plate, and the outer contour of the end plate is larger than the outer contour of the cross-section of the dumbbell-shaped steel pipe. An anchor bolt hole is provided on each side of the end plate along the pier cross bridge, and the dumbbell-shaped steel pipe is filled with concrete. The bridge piers and caps are connected by grouting corrugated sleeves. The dumbbell-shaped steel pipes and reinforced concrete caps in the utility model are prefabricated components, which can meet the requirements of factory prefabrication and on-site assembly. The utility model has the characteristics of high axial and bending bearing capacity, good ductility, and large lateral rigidity, convenient construction, less on-site work and wet work, and meets the needs of rapid construction. It can be applied to bridge piers of major bridge projects, especially high pier structure used.

Description

Dumbbell-shaped concrete-filled steel tube composite bridge piers and the connection structure with caps

technical field

The utility model relates to the field of bridge engineering, in particular to a dumbbell-shaped steel pipe concrete composite bridge pier.

Background technique

With the development of my country's transportation industry, a large number of high-speed railways, highways, and sea-crossing bridges have been put into construction and use. In high-intensity areas of seismic fortification, in order to ensure the safety of bridge structures, bridge piers, as important load-bearing components, have high requirements for their seismic performance. Traditional bridge piers mostly use reinforced concrete piers, which have poor bearing capacity and ductility, and are prone to damage under strong earthquakes. For important lifeline projects such as sea-crossing bridges, it is extremely difficult to repair bridge piers when they are damaged.

In recent years, CFST bridge piers have been used in bridge structures due to their good seismic performance and convenient construction. Circular and rectangular steel pipe concrete piers are mostly used in existing practical projects. Among them, the confinement effect of the steel pipe on the concrete in the circular CFST pier is the best, but its stiffness in the transverse direction is the same as that in the longitudinal direction, and the longitudinal direction is too wasteful when meeting the stiffness requirements in the transverse direction. Rectangular concrete-filled steel tube piers can meet the different requirements of stiffness in the transverse direction and along the direction of the bridge, but the larger the width-thickness ratio, the worse the confinement effect of the steel tube on the concrete, and the worse the ductility of the bridge pier.

At the same time, in sea-crossing bridges, mountain bridges, and reservoir bridges, due to factors such as complex terrain or navigation requirements, high piers are more and more widely used. Under the action of cross bridge wind load, earthquake load, etc., the bending moment at the bottom of high bridge piers is relatively high, and a section with more efficient bending resistance is required. Therefore, a new type of dumbbell-shaped bridge pier section composed of round steel pipes at both ends and double-layer steel plates in the middle is proposed to effectively increase the lateral stiffness and bending capacity of the cross bridge with high piers, improve driving comfort and the ability to resist natural disasters.

At present, there are generally two construction methods for the connection between concrete filled steel pipe piers and caps: bearing plate connection and embedded connection. Among them, the pressure-bearing plate connection refers to welding the end plate at the bottom of the steel pipe, and the end plate is connected to the cap platform through anchor bolts and anchoring steel bars. The construction process is relatively cumbersome. Embedded connection means that the bottom end of the steel pipe is welded to the end plate, and the lower part of the steel pipe and the end plate are embedded in the cap for anchoring, and the cast-in-place cap is often used in construction. In order to shorten the construction period of the bridge and open it to traffic as soon as possible, it is urgent to propose a pier-cap connection method that can realize prefabricated assembly to meet the needs of rapid bridge construction.

Therefore, it is an urgent technical problem to design a high bridge pier form with relatively large lateral stiffness and strength of the transverse bridge, and to study a connection method between the bridge pier and the cap that can realize rapid construction.

Utility model content

The utility model proposes a dumbbell-shaped steel pipe concrete composite bridge pier and a connection structure with a bearing platform. The purpose of the dumbbell-shaped concrete-filled steel pipe composite pier is to overcome the shortcomings of the existing pier such as self-heaviness and poor seismic performance, fully considering the large difference in stiffness between the transverse direction and the longitudinal direction of the pier, the pier has high bearing capacity and ductility. Well, the transverse anti-lateral stiffness is large, and it is suitable for high piers. The fast construction method for the connection between the dumbbell-shaped concrete-filled steel pipe pier and the cap is an embedded connection of grouted metal corrugated sleeves, which can be applied to the connection and anchorage of prefabricated bridge piers and caps. The connection structure has good seismic performance, convenient construction, and on-site operation. Small quantity is conducive to shortening the construction period, and has good economic benefits and safety performance.

In order to solve the above technical problems, the utility model proposes a dumbbell-shaped concrete-filled steel pipe composite bridge pier, which includes a dumbbell-shaped steel pipe. Describe the outer profile of the cross section of the dumbbell-shaped steel pipe, the end plate is provided with an anchor bolt hole on both sides along the pier cross bridge, and the dumbbell-shaped steel pipe is filled with concrete.

Further speaking, the dumbbell-shaped steel pipe is composed of two round steel pipes and double-layer steel plates welded between the two round steel pipes, and the double-layer steel plates are symmetrically distributed along the line connecting the centroids of the two round steel pipes .

The welding between the double-layer steel plate and the two round steel pipes adopts fillet welding.

The above-mentioned connection structure between steel pipe concrete composite bridge piers and caps, wherein, the caps are reinforced concrete caps, and the central position of the reinforced concrete caps is provided with a groove for embedding a dumbbell-shaped steel pipe concrete composite bridge pier. The depth is the embedding depth of the pier, the side wall of the groove is composed of a metal corrugated sleeve embedded with the cap, and the dumbbell-shaped concrete-filled steel pipe composite bridge pier is temporarily fixed with the cap through pre-embedded bolts; the dumbbell-shaped The outer contour of the horizontal projection of the steel pipe concrete composite pier is smaller than the horizontal projection inner contour of the metal corrugated sleeve, and fiber-reinforced cement is filled between the dumbbell-shaped steel pipe concrete composite pier and the metal bellows.

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

1. Dumbbell-shaped concrete-filled steel pipe composite piers have high transverse bending stiffness and are suitable for high bridge piers. On the basis of ensuring the bending stiffness along the bridge direction, the cross-sectional area is reduced, which meets the large difference in bending stiffness between the transverse bridge direction and the along bridge direction of bridge engineering, and also avoids the poor confinement effect of steel pipes when the width-thickness ratio of rectangular steel pipe concrete piers is large. disadvantages.

2. The dumbbell-shaped concrete-filled steel tube composite pier not only ensures the vertical bearing capacity, but also has a higher lateral bending bearing capacity. Compared with other cross-sectional shapes, the circular steel tubes in the dumbbell-shaped concrete-filled steel tube piers have a better confinement effect on the concrete, which improves the compressive strength and ductility of the concrete material, and can make full use of the material strength.

3. When used in bridges that cross rivers, seas, or reservoirs, the piers have a circular cross-section in the cross-bridge direction, which is conducive to the passage of water and reduces the impact of hydrodynamic pressure on the structure.

4. Compared with the connection method of the existing bridge pier and the cap, the structure and method of the connection between the steel pipe concrete bridge piers and the caps of the utility model are simple and convenient in construction, with less on-site workload and wet work, and can realize the connection of prefabricated bridge piers and prefabricated caps, and Connection nodes have better seismic performance. No formwork is required during the construction process, which is beneficial to shorten the construction period and has good economic benefits.

Description of drawings

Figure 1-1 is a schematic diagram of the cross-sectional structure of the connection between the pier and the cap of the utility model;

Figure 1-2 is a top view of the connection between the pier and the cap shown in Figure 1-1;

Figure 2-1 is a top view of the platform of the utility model;

Figure 2-2 is a cross-sectional view of the platform of the utility model;

Fig. 3 is the plan view of end plate in the utility model;

Fig. 4-1 is the top view of the dumbbell-shaped steel pipe in the utility model;

Fig. 4-2 is the front view of the dumbbell-shaped steel pipe in the utility model;

Figure 5-1 is a top view of the bridge pier steel structure part temporarily fixed on the cap in the utility model;

Fig. 5-2 is the front view of the bridge pier steel structure part temporarily fixed on the cap in the utility model.

In the figure, 1-dumbbell-shaped steel pipe, 2-inner concrete, 3-end plate, 4-metal corrugated sleeve, 5-cap, 6-round steel pipe, 7-steel plate, 8-anchor bolt hole, 9-anchor Bolt connector, 10-fiber reinforced cement.

Detailed ways

The technical scheme of the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the utility model, and are not intended to limit the utility model.

A dumbbell-shaped steel pipe concrete composite bridge pier proposed in the utility model includes a dumbbell-shaped steel pipe 1, as shown in Figure 4-1 and Figure 4-2, the dumbbell-shaped steel pipe 1 is composed of two circular steel pipes 6 and welded The double-layer steel plate 7 between the two round steel pipes 6 is formed, and the double-layer steel plate 7 is symmetrically distributed along the line connecting the centroids of the two round steel pipes 6. The double-layer steel plate 7 and the two round steel pipes The welding between the steel pipes 6 adopts fillet weld welding. The bottom of the dumbbell-shaped steel pipe 1 is welded with an end plate 3 by a fillet weld. The outer profile of the end plate 3 is larger than the outer profile of the cross-section of the dumbbell-shaped steel tube 1. An anchor bolt hole 8 is provided on both sides. As shown in FIG. 3 , the dumbbell-shaped steel pipe 1 is filled with concrete 2 , and concrete is poured inside the dumbbell-shaped steel pipe to restrain the steel pipe from buckling inward.

The connection structure between the steel pipe concrete composite pier and the bearing platform of the utility model is shown in Figure 2-1 and Figure 1-2. The bearing platform is a reinforced concrete bearing platform 5, and the central position of the reinforced concrete bearing platform 5 is provided with a A groove for embedding dumbbell-shaped concrete-filled steel pipe composite piers, the depth of which is the embedding depth of the bridge pier, and the side walls of the groove are composed of metal corrugated sleeves 4 embedded with reinforced concrete caps, and the dumbbell-shaped steel-filled steel pipe concrete The composite bridge pier is temporarily fixed to the reinforced concrete cap 5 through pre-embedded bolts 9; the horizontal projection outer contour of the dumbbell-shaped steel pipe concrete composite bridge pier 1 is smaller than the horizontal projection internal contour of the metal corrugated sleeve 4, the Fiber-reinforced cement 10 is filled between the dumbbell-shaped steel pipe concrete composite pier and the metal corrugated sleeve 4 .

The construction method of the connection structure between the steel pipe concrete composite bridge pier and the bearing platform of the utility model, the bridge pier and the bearing platform adopt the embedded connection of the grouting corrugated sleeve, the dumbbell-shaped steel pipe 1 and the reinforced concrete bearing platform 5 in the utility model are prefabricated components, All can meet the requirements of factory prefabrication and on-site assembly to achieve rapid construction. The specific construction steps are as follows:

Step 1. The dumbbell-shaped steel pipe 1 is prefabricated in the factory, and the end plate 3 is made according to the designed size. On the end plate 3, an anchor bolt hole 8 is provided on both sides along the cross bridge of the pier, as shown in Figure 3; it is processed according to the designed size The double-layer steel plate 7 and two circular steel pipes 6 are welded by fillet welds. The double-layer steel plate 7 is welded to the two circular steel pipes 6, and the upper end plate 3 is welded by fillet welds at the bottom, thus forming a dumbbell-shaped concrete-filled steel pipe combination The steel structure part of the bridge pier is shown in Figure 4-1 and Figure 4-2. The material of the double-layer steel plate 7 and the circular steel pipe 6 can be selected from ordinary low-carbon steel or weathering steel, and can also be high-strength steel with a yield strength above 550MP. If it is used in cross-river, cross-reservoir, and sea-crossing bridges, stainless steel can also be used to improve its corrosion resistance. In order to avoid bursting of the fillet weld between the web formed by the middle double-layer steel plate 7 and the round steel pipe 6, the concrete is poured conventionally instead of high-pressure pumping.

Step 2, factory prefabrication of reinforced concrete cap 5: Bind the reinforcement cage according to the design size of reinforced concrete cap 5, and set metal corrugated sleeve 4 at the embedding position of the bridge pier before pouring the reinforced concrete cap 5, to reserve for the bridge pier Embedded space, the cross-sectional size of the metal corrugated sleeve 4 is larger than the size of the end plate 3 at the bottom of the pier, the height of the metal corrugated sleeve 4 is the embedding depth of the pier; and it is aligned with the anchor hole 8 on the end plate 3 The pre-embedded anchor bolt 9 is set at the position; the concrete is poured to obtain the prefabricated reinforced concrete cap 5, as shown in Figure 2-1 and Figure 2-2.

Step 3. At the construction site, install the prefabricated reinforced concrete cap 5 in step 2 according to the design position, and erect the steel structure part of the dumbbell-shaped concrete filled steel pipe composite bridge pier prepared in step 1 on the reinforced concrete cap with the end plate 3 facing down In the metal corrugated sleeve 4 inside 5, during on-site hoisting, the embedded anchor bolt 9 on the cap platform is aligned with the anchor bolt hole 8 on the end plate 3, and the steel structure of the dumbbell-shaped steel pipe concrete composite pier is connected through the anchor bolt connector. Part of it is connected to the reinforced concrete cap 5, and the anchor bolt 9 is only used for temporary fixing of the steel pipe during the construction process, as shown in Figure 5-1 and Figure 5-2, even if the dumbbell-shaped steel pipe 1 is temporarily fixed at the designated position of the pier. After the dumbbell-shaped steel pipe 1 is installed, concrete is poured to the inside of the round steel pipe 6 of the dumbbell-shaped steel pipe 1 and the inside of the double-layer steel plate 7, thereby forming a dumbbell-shaped steel pipe concrete composite pier. The poured concrete can be selected from ordinary concrete, Any one of high-strength concrete, recycled concrete and rubber concrete, the gap between the metal corrugated sleeve 4 and the dumbbell-shaped concrete-filled steel pipe composite pier is filled with fiber-reinforced cement 10, as shown in Figure 1-1 and Figure 1-2 Show.

The utility model steel pipe concrete composite bridge pier has the characteristics of high axial and bending bearing capacity, good ductility, and large lateral rigidity, convenient construction, less on-site operations and wet operations, meets the needs of rapid construction, and can be applied to major bridge projects. Bridge piers, especially high pier structures

Although the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the utility model, many deformations can be made without departing from the purpose of the utility model, and these all belong to the protection of the utility model.

Claims (4)

1. A kind of 1. concrete-filled steel tube with dumbbell sections assembled pier, it is characterised in that including dumbbell shape steel tube (1), the dumbbell shaped steel There is end plate (3) bottom of pipe (1) using fillet weld seam, and the outline of the end plate (3) is more than the dumbbell shape steel tube (1) The outline of cross section, 1 anchor hole (8), the dumbbell shape steel tube are respectively provided with along bridge pier direction across bridge both sides on the end plate (3) (1) concrete (2) is filled with.
2. 2. concrete-filled steel tube with dumbbell sections assembled pier according to claim 1, it is characterised in that the dumbbell shape steel tube (1) It is made up of two round steel pipes (6) and the double-layer plate (7) being welded between described two round steel pipes (6), the double-layer plate (7) it is symmetrical along the centre of form line of described two round steel pipes (6).
3. 3. concrete-filled steel tube with dumbbell sections assembled pier according to claim 2, it is characterised in that the double-layer plate (7) with Welding between described two round steel pipes (6) uses fillet weld seam.
4. 4. the attachment structure of a kind of steel-pipe concrete assembled pier and cushion cap, it is characterised in that steel-pipe concrete assembled pier is Concrete-filled steel tube with dumbbell sections assembled pier as described in any in claims 1 to 3, cushion cap are reinforced concrete pile cap (5), institute The central position for stating reinforced concrete pile cap (5) is provided with the groove for being used for embedding concrete-filled steel tube with dumbbell sections assembled pier, described The depth of groove is bridge pier buried depth, and the side wall of the groove is by the wavy metal sleeve (4) with reinforced concrete pile cap (5) build-in Form, the concrete-filled steel tube with dumbbell sections assembled pier is temporarily solid by pre-embedded bolt (9) and the reinforced concrete pile cap (5) It is fixed；The outline of the floor projection of the concrete-filled steel tube with dumbbell sections assembled pier is less than the water of the wavy metal sleeve (4) The Internal periphery of flat projection, filled with fibre between the concrete-filled steel tube with dumbbell sections assembled pier and the wavy metal sleeve (4) Dimension enhancing cement (10).