CN207331424U - Steel skeleton prestressed concrete beam - Google Patents

Abstract

The utility model discloses a novel steel skeleton prestressed concrete beam, which comprises a steel skeleton, a prestressed pipe, a prestressed cable, high-strength concrete in a prestressed pipe, a prestressed anchor, a steel bar system and a concrete beam body, the steel skeleton and the prestressed concrete beam. The stress system forms a stress system similar to a triangular truss, which enhances the bending resistance of the beam and increases the bearing capacity of the beam body. It is used in bridges, buildings and other fields. The design bearing capacity of the beam body can be enhanced and the span Can be further enlarged. The purpose of the utility model is to provide a new type of prestressed concrete beam which is simple, easy to implement, strong in bending resistance, high in bearing capacity, large in span, and economical and effective.

Description

steel frame prestressed concrete beam

technical field

The utility model relates to a bridge structure, in particular to a steel skeleton prestressed concrete beam.

Background technique

Prestressed Concrete Beam: Pre-applied to the beam to cause a negative bending moment in the mid-span, so as to partially offset the positive bending moment of the beam in use.

Prestressed concrete structures avoid premature cracks in reinforced concrete structures, make full use of high-strength steel bars and high-strength concrete, and try to generate pre-stress before the structural members are loaded to reduce or offset the concrete tension caused by the load, making it basically under pressure.

At present, prestressed concrete is mainly used in: (1) structures that require higher levels of crack control; (2) components with large spans or greater stress; (3) components that require higher structural stiffness and deformation control.

The role of prestressed beams:

1. The use of high-strength tensile prestressed materials can increase the load capacity of the beam;

2. Under the same load, the prestressed beam can reduce the section size and reduce the self-weight;

3. Because the beam is prestressed, it basically overcomes the crack problem of ordinary reinforced beams.

The existing prestressed concrete beam is a relatively mature technology. By adding prestress in the beam body, the bearing capacity of the beam can be improved, and the volume and cross section of the beam can be reduced. The current prestressed concrete beams rarely exceed the span of 30 meters. In order to meet the needs of large spans, other designs have to be adopted; and with the extension of service time, the prestressed steel cables will creep under the load. As the camber decreases, the bearing capacity of the beam decreases, and the failure gradually accelerates.

Utility model content

In order to solve the above problems, the utility model provides a steel skeleton prestressed concrete beam, including steel skeleton, prestressed pipe, prestressed anchor, anti-push rod, prestressed cable, steel bar system, concrete beam body and high-strength polyester fiber Mortar, the two ends of the concrete beam are prestressed prestressed anchors, characterized in that,

The concrete beam body is provided with multiple steel skeleton structures, and the two ends of the beam body are fixedly connected with the prestressed prestressed anchors,

The number of steel frames can be determined according to the length of the beams, and the steel frame is formed by connecting multiple frames, which can be freely combined according to the length of the beams;

The included angle of the top of the steel frame is within 45 degrees to 90 degrees. The steel frame can be Q235 or Q345 steel, or other steel types can be selected according to the actual situation. The steel frame of each frame is formed by welding, and the frame of each frame Prestressed pipe holes and bolt holes are reserved on the steel frame foot plate;

Prestressed pipe holes are provided at every two joints of the steel skeleton;

The steel skeleton is provided with anti-push rods at the joints between the two ends of the beam and the prestressed anchors.

Further, the steel skeleton and prestressed anchorage,

The steel skeleton and the prestressed anchor are connected by high-strength bolts.

Further, the steel skeleton and prestressed anchorage,

The connection between the steel frame and the prestressed anchor is provided with an anti-push rod.

Further, the prestressed cables and prestressed pipes,

After the prestressed pipeline is stretched, the high-strength mortar is injected.

Preferably, high-strength polyester fiber mortar is injected into the prestressed pipe.

The utility model has the advantages of:

1. The steel skeleton prestressed concrete beam of the present invention has a truss structure composed of steel skeleton and prestressed cables, which increases the rigidity and bearing capacity of the beam body.

2. The steel frame prestressed concrete beam of the present invention can further increase the span of the bridge because the steel frame and prestressed cables form a truss structure.

3. The utility model adopts high-strength polyester fiber mortar to press-inject the prestressed pipe, which enhances the durability and tolerance of the prestressed cable.

4. The utility model adopts the free combination of multiple steel skeletons, which is suitable for concrete beams with different spans.

5. The multiple steel skeleton structure of the utility model can be applied to various shapes and types of concrete beams by changing the shape and size of the single beams.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of steel frame prestressed concrete beam of the present invention;

Fig. 2 is that the utility model has the schematic diagram of the longitudinal section of the stable beam steel framework system;

Fig. 3 is a schematic diagram of the longitudinal section of the steel framework system without stabilizing beams of the utility model;

Fig. 4 is a schematic diagram of the three-dimensional structure of the anchoring end of the utility model;

Among them, 1-steel skeleton, 2-prestressed pipe, 3-prestressed anchor, 4-anti-push rod, 5-rebar, 6-concrete beam, 7-steel skeleton foot plate, 8-stabilizing beam, 31-prestressed Anchor plate, 32-prestressed cable, 33-connecting bolt, 34-compression spring.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings.

According to the three-dimensional structural schematic diagram of the steel skeleton prestressed concrete beam of the present utility model in Fig. 1, the utility model provides a kind of steel skeleton prestressed concrete beam, comprising steel skeleton 1, prestressed pipeline 2, prestressed anchor 3, anti-push rod 4 , steel bar 5, concrete beam body 6, the steel skeleton 1 is connected to the prestressed anchor 2 by bolts at both ends of the beam, and each steel skeleton is connected with other steel skeletons by bolts. The steel frame is covered with reinforcement bars 5 . After the steel skeleton, steel bars, prestressed pipes, prestressed cables and prestressed anchors are installed, the concrete is poured, and after the pouring is completed, the prestressed cables are tensioned. The included angle at the top of the steel frame 1 should be between 45 degrees and 90 degrees.

According to Fig. 2 and Fig. 3, the utility model has a schematic diagram of a longitudinal section of a steel skeleton system with stabilizing beams and a schematic diagram of a longitudinal section of a steel skeleton system without stabilizing beams, and provides two types of steel skeletons with stabilizing beams 7 and steel skeletons without stabilizing beams. The steel frame without stabilizing beams can be connected and fixed with the outer steel bars 5 .

According to the three-dimensional structural diagram of the anchoring end of the utility model shown in FIG. 4 , two anti-push rods 4 are provided on the foot plate 7 connected to the steel skeleton at both ends of the beam and the prestressed anchorage. The foot plates at both ends of the beam are located between the prestressed anchor plate 31 and the compression spring 34 . There are prestressed cables 32 in the prestressed pipeline, and after the prestressed cables are stretched, high-strength polyester fiber mortar is injected.

The double chain high and low cable suspension bridge of the utility model is divided into: a prestressed concrete beam with a steel skeleton of a stable beam and a prestressed concrete beam with a steel skeleton of a stable beam.

For the prestressed concrete beam scheme of the steel skeleton, it is best to use a stable beam type, so that the overall mechanical performance of the beam will be better, and the span can be increased, the volume can be reduced, and the bearing capacity can be improved under the same prestressed cable condition .

The steel skeleton prestressed concrete beam solves: 1. Improve the bearing capacity of the prestressed concrete beam; 2. Increase the applicable span range, which can break through the limitation of the 30-meter span of the prestressed concrete beam; 3. High-strength polyester fiber mortar The pressure injection delays the decay of the prestressing system and increases durability and durability.

The steel skeleton prestressed concrete beam of the present invention has been described above by way of illustration of the accompanying drawings. Those skilled in the art should understand that the present disclosure is not limited to the embodiments described above, without departing from the scope of the present invention , various variations, alterations and substitutions are possible.

Claims (5)

1. a kind of novel steel skeleton prestressed concrete beam, including it is steel skeleton, prestress pipe, prestressed anchor, anti-push rod, pre- Stress rope, reinforcing bar system, concrete beam body and high-strength polyester fibers mortar, the beams of concrete both ends are prestressing force prestressed anchor Tool, it is characterised in that

More Pin steel skeleton constructions are set in the beams of concrete body, are mutually fixed at beam body both ends and the prestressing force prestressed anchor Connection,

The steel skeleton, can determine Pin numbers according to the length of beam,

The steel skeleton top clip angle within 45 degree to 90 degree,

The every two Pin junctions of steel skeleton are equipped with prestress pipe hole,

The steel skeleton is equipped with anti-push rod at beam both ends and prestressed anchor junction.

A kind of 2. novel steel skeleton prestressed concrete beam according to claim 1, it is characterised in that bag in the beam body Steel skeleton, prestressed anchor and anti-push rod are included,

At the prestressed anchor, steel skeleton and prestressed anchor bolt split are employed.

A kind of 3. novel steel skeleton prestressed concrete beam according to claim 1, it is characterised in that bag in the beam body Steel skeleton, prestressed anchor and anti-push rod are included,

The steel skeleton is equipped with anti-push rod at beam both ends and prestressed anchor junction.

A kind of 4. novel steel skeleton prestressed concrete beam according to claim 1, it is characterised in that the prestressed pipe In road after tensioning is completed pressure injection high-strength polyester fibers mortar.

5. a kind of novel steel skeleton prestressed concrete beam according to claim 1, it is characterised in that the steel skeleton is adopted With the mode of split.