CN203878449U - Steel tube concrete string rigid beam - Google Patents

Abstract

The utility model relates to a steel pipe concrete tension beam, which comprises a built-in steel pipe concrete tension beam and outsourced reinforced concrete. The steel strands at the bottom of the web bar, the anchor ends that are arranged at the two ends of the concrete-filled steel pipe upper chord and apply prestress to the steel strands, the reinforced concrete includes a steel cage hanging on the concrete-filled steel pipe upper chord, concrete, and the concrete-filled steel pipe The upper chord, the web and the steel strands are surrounded by steel cages. During the construction process of the utility model, the structural self-weight and construction load are all borne by the built-in steel pipe concrete string beam, without support, the construction efficiency is high, and the construction progress can be accelerated. At the same time, through the hoop effect of the steel pipe on the concrete, the strength of the concrete inside the steel pipe is improved, and the brittleness of the ultra-high-strength concrete is improved, so it has the advantages of high bearing capacity, good plasticity and seismic performance.

Description

A steel tube concrete tension beam

technical field

The utility model relates to a steel pipe concrete tension beam. the

Background technique

With the continuous development of the national economy and the continuous advancement of urbanization, domestic infrastructure construction has been in progress for many years, and a large number of bridges in cities and villages are about to be built or need to be built. However, it is becoming more and more difficult to coordinate land resources and spaces in developed cities, resulting in Urban traffic bridge construction sites are small, and it is difficult to erect scaffolding and other supports without affecting normal traffic. There are many mountainous areas in the central and western regions, where the ground height difference is steep and dangerous, and there are many karsts, landslides, unstable slopes, collapses, Due to the unfavorable geology such as steep cliffs and gas formations, and many water systems, the hydrogeological conditions vary along the route. The construction environment of bridges is very complicated, and it is often difficult to erect scaffolding and other supports, and large machinery and equipment cannot enter. Therefore, under the condition of satisfying the design stress conditions, choosing a more economical and reasonable construction plan has become a very worthwhile research problem in bridge construction. At the same time, our country is a disaster-prone country. When disasters such as floods and earthquakes occur, road traffic will often be severely damaged. Time to enter the disaster area for disaster relief and rescue. the

Contents of the invention

The utility model makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the utility model is to provide a concrete-filled steel tube tension beam. Bearing, no support, high construction efficiency, can speed up the construction progress; at the same time, through the hoop effect of the steel pipe on the concrete, the strength of the concrete inside the steel pipe is improved, and the brittleness of the ultra-high-strength concrete is improved, so it has the advantages of high bearing capacity, good plasticity and seismic performance . the

In order to solve the above-mentioned technical problems, the technical solution of the present utility model is: a concrete-filled steel pipe tension beam, comprising a built-in steel pipe concrete tension beam and outsourced reinforced concrete; The web bar at the bottom of the concrete top chord, the steel strands arranged at the bottom of the web bar, the anchor ends that are arranged at both ends of the concrete-filled steel tube top chord and apply prestress to the steel strands, and the reinforced concrete includes hanging on the concrete-filled steel tube top chord steel cage, concrete, and the concrete-filled steel tube concrete upper chord, web and steel strands are surrounded by steel cages. the

Further, the web is V-shaped, the web is on the same plane as the concrete-filled steel tube top chord, and the volume of the web decreases from the middle to both sides. the

Further, the reinforcement cage includes several reinforcement frames and several transverse reinforcements arranged on the frames of the reinforcement frames. The plane where the reinforcement frames are located is perpendicular to the top chord of the concrete filled steel pipe, and the horizontal reinforcement is the same as the top chord of the concrete filled steel pipe. Towards. the

Further, the steel bar frame is polygonal or special-shaped, and the steel bar frame is made of ordinary steel bar or prestressed steel bar. the

Further, the transverse reinforcement is common reinforcement or prestressed reinforcement. the

Further, the steel strands are prestressed steel bars. the

Further, the concrete-filled steel tube concrete top chord is composed of a steel tube containing concrete, and the concrete inside the steel tube is high-strength self-compacting micro-expansion concrete. the

Compared with the prior art, the utility model has the following beneficial effects: During the construction process of the utility model, the structural self-weight and construction loads are all borne by the built-in steel pipe concrete tension beam, without support, the construction efficiency is high, and the construction progress can be accelerated; at the same time, through The hoop effect of the steel pipe on the concrete increases the strength of the concrete inside the steel pipe and improves the brittleness of the ultra-high-strength concrete, so it has the advantages of high bearing capacity, good plasticity and seismic performance. the

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail. the

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model. the

Fig. 2 is a schematic diagram of the structure of the steel pipe concrete tension beam in the embodiment of the utility model. the

Fig. 3 is a schematic diagram of the three-dimensional structure of the formwork hanging in the embodiment of the present invention. the

Fig. 4 is a schematic diagram of the cross-sectional structure of the steel pipe concrete tension beam of the embodiment of the utility model. the

Fig. 5 is a schematic diagram of the structure of the U-shaped hanger of the embodiment of the utility model. the

In the figure: 1- steel pipe concrete upper chord, 2- web, 3- steel strand, 4- anchorage end, 5- reinforcement frame, 6- transverse reinforcement, 7- U-shaped hanger, 8- U-shaped hanger horizontal Rod, 9-bottom formwork, 10-side wall formwork. the

Detailed ways

Embodiment 1: As shown in Figures 1 to 5, a concrete-filled steel tube tension beam includes a built-in concrete-filled steel tube tension beam and outsourced reinforced concrete. The web 2 at the bottom of the top chord 1, the steel strand 3 arranged at the bottom of the web 2, the anchorage end 4 arranged at both ends of the steel pipe concrete top chord 1 and applying prestress to the steel strand 3, the reinforced concrete includes hanging The reinforcing cage and concrete on the concrete-filled steel tube concrete upper chord, the concrete-filled steel tube upper chord 1, the web 2 and the steel strand 3 are all enclosed by the reinforcing cage. the

In this embodiment, the web 2 is V-shaped, the web 2 is on the same plane as the concrete-filled steel tube chord 1, and the volume of the web 2 decreases from the middle to both sides. the

In this embodiment, the reinforcement cage includes several reinforcement frames 5 and several transverse reinforcement bars 6 arranged on the frames of the reinforcement frames. 6 is in the same direction as the steel pipe concrete upper chord 1. the

In this embodiment, the steel bar frame 5 is rectangular, and the steel bar frame 5 is a common steel bar or a prestressed steel bar. the

In this embodiment, the transverse steel bars 6 are common steel bars or prestressed steel bars. the

In this embodiment, the steel strand 3 is a prestressed steel bar. the

In this embodiment, the concrete-filled steel pipe top chord 1 is composed of a steel pipe containing concrete, and the concrete inside the steel pipe is high-strength self-compacting micro-expansion concrete.

A kind of construction method of steel tube concrete tension beam, adopts the above-mentioned structure, carries out according to the following steps:

(1) Fabrication of concrete-filled steel pipe string beams: According to the specific conditions of the project, design the steel pipe material, diameter, length, strength of concrete poured in the steel pipe, web member 2 material, steel strand 3 diameter and tension prestress size in the concrete-filled steel pipe upper chord 1 according to the specific conditions of the project. The design requires the fabrication of steel pipe concrete string beams;

(2) Hang the fabricated steel cage on the string beam of concrete filled steel tube;

(3) Fix the two ends of the prepared concrete-filled steel tube tension beam on the pier, and evenly distribute several U-shaped hangers 7 on the concrete-filled steel tube upper chord 1. Bottom formwork 9 is laid on top, and side wall formwork 10 is erected on the peripheral side of bottom formwork 9;

(4) Concrete is poured into the formwork, and after it is formed, the formwork is removed to obtain a concrete-filled steel tube tension beam that meets the requirements.

In this embodiment, the quantity and arrangement position of the reinforcement frame and the transverse reinforcement in the reinforcement cage are determined according to the limit state of the bearing capacity and the limit state of normal service of the concrete-filled steel tube tension beam. the

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model. the

Claims (7)

1. a concrete filled steel tube is opened string stiffness beam, it is characterized in that: comprise that built-in concrete filled steel tube opens the steel concrete of string beam and outsourcing, described concrete filled steel tube is opened string beam and is comprised concrete filled steel tube upper chord, several are arranged on the web member of concrete filled steel tube upper chord bottom, be arranged on the steel strand of web member bottom, be arranged on concrete filled steel tube upper chord two ends and steel strand are applied to prestressed anchored end, described steel concrete comprises the reinforcing cage hanging on concrete filled steel tube upper chord, concrete, described concrete filled steel tube upper chord, web member and steel strand are all lived by reinforcing cage circle.

2. concrete filled steel tube according to claim 1 is opened string stiffness beam, it is characterized in that: described web member is in the shape of the letter V, and at grade, described web member is reduced to both sides volume successively by centre for described web member and concrete filled steel tube upper chord.

3. concrete filled steel tube according to claim 1 is opened string stiffness beam, it is characterized in that: described reinforcing cage comprises several reinforcing steel bar frames, the some transverse reinforcements that are arranged on reinforcing steel bar frame frame, plane and the concrete filled steel tube upper chord at described reinforcing steel bar frame place are perpendicular, and described transverse reinforcement and concrete filled steel tube upper chord are in the same way.

4. concrete filled steel tube according to claim 3 is opened string stiffness beam, it is characterized in that: described reinforcing steel bar frame is polygon, and described reinforcing steel bar frame is that plain bars or prestressed reinforcement are made.

5. concrete filled steel tube according to claim 3 is opened string stiffness beam, it is characterized in that: described transverse reinforcement is plain bars or prestressed reinforcement.

6. concrete filled steel tube according to claim 1 is opened string stiffness beam, it is characterized in that: described steel strand are prestressed reinforcement.

7. concrete filled steel tube according to claim 1 is opened string stiffness beam, it is characterized in that: described concrete filled steel tube upper chord forms by including concrete steel pipe, and the concrete in described steel pipe is high-intensity self-compaction slightly expanded concrete.