CN101798856B - Steel-concrete combined beam and construction method thereof - Google Patents

Abstract

The invention discloses a steel-concrete composite beam, which includes a reinforced concrete part for resisting pressure and a steel component part for resisting tension, the reinforced concrete part is an inverted U-shaped section, and the steel bars protrude from both ends of the beam to a certain extent. The distance is used for connection, and the steel member part is located at the bottom of the composite beam, and is formed into a whole with the concrete part by welding seam connection or bolt connection. The invention can enhance the anti-seismic performance of the structure, improve the ductility of the structure, and speed up the construction progress, and is a steel-concrete composite beam with relatively low engineering cost and convenient construction.

Description

A steel-concrete composite beam and its construction method

technical field

The invention mainly relates to a building structural component and a construction method thereof, in particular to a steel-concrete composite beam and a construction method thereof.

Background technique

Reinforced concrete structures have the advantages of convenient materials, good economy, and skilled construction techniques, and are widely used in our country. However, due to its heavy weight and large inertia, the seismic performance is not good. And because of its long construction period, it is not conducive to the developer's capital turnover. Moreover, the current reinforced concrete structure requires a lot of labor. my country's industrial structure is changing from labor-intensive to technology-intensive, and the salary level of labor is getting higher and higher. If the current construction mode is still adopted, the developer will Need to invest more cost. Steel structure is also a structural form that is widely used in my country. It has the characteristics of light weight, high strength, good ductility, fast construction speed and good seismic performance. But the construction of steel structures requires a lot of money.

The cast-in-place reinforced concrete structure affects the construction period due to the setting time of the concrete, but the existing structure still uses the cast-in-place reinforced concrete structure instead of prefabricated components, because most of the existing prefabricated components do not have reliable connections, which is not conducive to earthquake resistance , in order to meet the seismic requirements need to invest more costs.

In terms of material performance, concrete has a strong compressive capacity, while steel will not be unstable when subjected to tension. Reinforced concrete takes advantage of this feature. In addition, steel concrete and steel pipe concrete are also used in some structures, and they all have good performance. But its disadvantage is that the weight is relatively large, and the consumption of steel is not less.

Contents of the invention

The technical problem to be solved by the present invention lies in: aiming at the problem that structural performance, construction speed and construction cost cannot be well balanced in the prior art, the present invention provides a low-cost, simple and convenient design and manufacture, and low construction difficulty. The construction speed is fast, and it can be used for steel-concrete composite beams in various structural forms.

In order to solve the above problems, the solution proposed by the present invention is: a steel-concrete composite beam, comprising a reinforced concrete part (2) and a steel component part (3), the reinforced concrete part (2) is an inverted U-shaped section, and the steel bar ( 4) A certain distance is extended at both ends of the beam for connection, the steel member part (3) is located at the bottom, and the steel member part (3) is a steel plate or a steel beam, which is composed of a welded seam connection or a bolt connection with the concrete part (2) As a whole, when the steel member part (3) and the concrete part (2) are connected by welds, the bottom of the concrete part (2) is provided with a pre-embedded connector (6); when the steel member part (3) and the concrete part (2) When bolt connection is used, the concrete bottom is provided with embedded screw rods (5), and there are multiple embedded connectors in the same beam, and their distribution is discontinuous. The types are divided into two categories, one is embedded connectors There is no connection between them, and the other is that the pre-embedded connectors are connected by welds through the long steel bars (12) connecting the pre-embedded connectors. There are multiple pre-embedded screws (5) in the same beam, and their distribution It is discontinuous, and its type is divided into two categories, one is that there is no connection between the pre-embedded screws, and the other is that the pre-embedded screws are welded with weld seams through the long steel bars (13) connected to the pre-embedded bolts, First make an inverted U-shaped mold, put the steel bars into the mold and fix it, then pour concrete into the mold to make a U-shaped reinforced concrete member, and pre-embed connectors or screws in the concrete, and finally weld the steel member to the pre-fabricated Embed the connecting piece or put the steel member on the screw and tighten it with a nut to form a steel-concrete composite beam. When the steel-concrete composite beam is connected with a pilaster or a wall, the composite beam is placed on the pilaster or wall, and the beam The beam is connected with the steel bar (4) protruding from its own two ends, and a certain gap is left between the beam and the beam, and gravel concrete (8) is poured into the gap; the steel-concrete composite beam and the cast-in-place reinforced concrete column (1) When connecting, the composite beam is put into the template when the cast-in-place reinforced concrete formwork is supported, and the beam and the beam are connected with the steel bars protruding from their own two ends, leaving a certain gap between the beam and the beam, and then Pour concrete into the formwork; when the steel-concrete composite beam is connected to the prefabricated slab (10), the prefabricated slab is directly placed on the top surface of the steel-concrete composite beam, and a certain distance is left between the two ends of the prefabricated slab (10), and gravel concrete is poured. (8); when the steel-concrete composite beam is connected with the cast-in-place reinforced concrete slab (11), the composite beam is used as a part of the template, and is higher than a certain distance of the template, and then the reinforced concrete is inserted in the template.

The manufacture of steel-concrete composite beams is completed in the prefabrication plant, and different specifications can be produced. The cross-sectional size and reinforcement amount of the reinforced concrete part are determined by design calculations, and the protruding length of the steel bars at both ends of the beam is determined by the anchorage length required by the structure. , the material and cross-sectional size of the steel member are determined by design calculations.

A method for manufacturing a steel-concrete composite beam, characterized in that the manufacturing steps are: ① Utilize an existing or make a new trough mold; ② Use the trough mold to make a trough-shaped reinforced concrete member, and pre-embed the connection in the concrete ③ Weld the steel components to the embedded connectors or put the steel components on the screws and tighten them with nuts to form a steel-concrete composite beam

When the steel-concrete composite beam is connected with the body of wall 9, the composite beam is placed on the body of wall 9, and the beam and the beam are connected by steel bars protruding from both ends of the beam. Gravel concrete 8 is poured in; when the steel-concrete composite beam is connected with the cast-in-place reinforced concrete column 1, the composite beam is put into the formwork when the cast-in-place reinforced concrete formwork is supported, and the beam and the beam are extended by their own two ends. The out-of-the-box steel bars are connected, and there is a certain gap between the beams, and then the reinforced concrete is inserted into the formwork; when the steel-concrete composite beam is connected to the prefabricated slab 10, the prefabricated slab is directly placed on the top surface of the steel-concrete composite beam, Leave a certain distance between the two ends of the prefabricated slab 10 and pour crushed stone concrete 8; Insert reinforced concrete.

Compared with the prior art, the present invention takes into account structural performance, construction speed and construction cost, and can be well connected with existing structural forms, and can also be expanded and evolved into new structural forms. Its advantages lie in:

(1) The concrete part in the steel-concrete composite beam of the present invention is hollowed out on the basis of the rectangular cross-section beam, so that the weight of the beam is greatly reduced and has good seismic performance; There will be problems of instability; beams are connected by steel bars at both ends, and then filled with concrete, and its integrity is no less than that of cast-in-place reinforced concrete structures;

(2) Compared with steel structure and steel concrete structure, this kind of composite beam has a large reduction in steel consumption, which can save a lot of cost;

(3) This kind of composite beam is manufactured in the prefabrication factory, the required mold is simple, and the manufacturing process is clear;

(4) This composite beam can be well connected with various structures, the construction process is simple, no formwork is required, and the construction speed is fast;

(5) This kind of composite beam adopts assembly construction, which requires less manpower, can reduce salary expenses, and can accumulate experience for technology-intensive construction.

Description of drawings

Figure 1 is a schematic cross-sectional view of a steel-concrete composite beam, in which the steel member and concrete are connected by bolts, and there is no direct connection between the bolts;

Figure 2 is a schematic cross-sectional view of a steel-concrete composite beam, in which the steel member and concrete are connected by bolts, and the bolts in the same longitudinal direction are connected by a long steel bar;

Figure 3 is a schematic cross-sectional view of a steel-concrete composite beam, in which the steel member and concrete are connected by welds, and there is no connection between bolts;

Figure 4 is a schematic cross-sectional view of a steel-concrete composite beam, in which the steel member and concrete are connected by a weld, and the bolts in the same longitudinal direction are connected by a long steel bar;

Fig. 5 is a schematic diagram of the joints of steel-concrete composite beams connected to pilasters or walls;

Fig. 6 is the node schematic diagram that steel-concrete composite beam is connected with cast-in-place reinforced concrete column;

Fig. 7 is a schematic diagram of connection nodes between a steel-concrete composite beam and a prefabricated slab;

Fig. 8 is a schematic diagram of connection nodes between a steel-concrete composite beam and a cast-in-place slab;

Fig. 9 is a perspective view of a steel-concrete composite beam.

illustration:

1. Cast-in-place concrete column 2. Reinforced concrete part

3. Steel component parts 4. Steel bars

5. Embedded screw 6. Embedded connectors

7. Welding seam 8. Gravel concrete

9. Wall 10. Prefabricated panels

11. Cast-in-place floor slabs 12. Full-length steel bars connecting pre-embedded connectors

13. Full-length steel bars connecting embedded bolts.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Example 1:

Referring to Fig. 2, a steel-concrete composite beam mainly includes a reinforced concrete part 2 for compressive resistance and a steel member part 3 for tensile resistance, and the steel member part is made of a steel plate. The reinforced concrete part 2 is an inverted U-shaped section, and the steel plate part and the reinforced concrete part 2 are connected by bolts. The long reinforcing bars 13 connecting the embedded bolts are arranged between the screw rods to connect to each other.

Example 2:

A construction method for a steel-concrete composite beam: first make an inverted U-shaped mold, put steel bars into the mold and fix it, then pour concrete into the mold to make a U-shaped reinforced concrete member, and set the pre-buried in the concrete Screw rod 5, and finally weld the steel plate to the embedded connector or put the steel plate on the screw rod and tighten it with nuts to form a steel-concrete composite beam. The steel-concrete composite beam is connected with the wall (Fig. 5). The composite beam is placed on the wall, and the beam and the beam are connected by steel bars protruding from both ends of the beam. There is a certain gap between the beam and the beam, and Pour crushed stone concrete 8 into the gap.

Claims (4)

1. A steel-concrete composite beam is characterized in that: comprise reinforced concrete part (2) and steel member part (3), reinforced concrete part (2) is an inverted U-shaped section, and reinforcing bar (4) is at the two ends of the beam Protrude a certain distance for connection, the steel component part (3) is located at the bottom, the steel component part (3) is a steel plate or a steel beam, and forms a whole with the concrete part (2) through welding seam connection or bolt connection, when the steel component part (3) When connecting with the concrete part (2) by welding, the bottom of the concrete part (2) is provided with a pre-embedded connector (6); when the steel member part (3) is connected with the concrete part (2) by bolts, the concrete bottom Set the embedded screw (5). 2. A steel-concrete composite beam according to claim 1, characterized in that: there are multiple embedded connectors in the same beam, and their distribution is discontinuous, and their types are divided into two categories, one One type is that there is no connection between the pre-embedded connectors, and the other type is that the pre-embedded connectors are connected by welds through the long steel bars (12) connecting the pre-embedded connectors. 3. A steel-concrete composite beam according to claim 1, characterized in that: there are multiple pre-embedded screw rods (5) in the same beam, their distribution is discontinuous, and their types are divided into two categories , a class is that there is no connection between the embedded screws, and another type is that the long reinforcing bars (13) connecting the embedded bolts are welded with weld seams between the embedded screws. 4. A construction method for a steel-concrete composite beam is characterized in that: first make an inverted U-shaped mold, put the reinforcing bar in the mold and fix it, then pour concrete in the mold to make a U-shaped reinforced concrete member, and Pre-embed connectors or screws in the concrete, and finally weld the steel components to the pre-embedded connectors or put the steel components on the screws and tighten them with nuts to form steel-concrete composite beams, steel-concrete composite beams and pilasters or walls When connecting, the composite beam is placed on the pilaster or the wall, and the beam and the beam are connected by the steel bars (4) protruding from both ends of the beam, and there is a certain gap between the beam and the beam, and the crushed stone concrete (8); when the steel-concrete composite beam is connected with the cast-in-place reinforced concrete column (1), the composite beam is put into the formwork when the cast-in-place reinforced concrete formwork is supported, and the beam and the beam are extended by their own two ends. When the steel-concrete composite beam is connected with the prefabricated slab (10), the prefabricated slab is directly placed on the top of the steel-concrete composite beam On the surface, leave a distance between the two ends of the prefabricated slab (10) and pour gravel concrete (8); A certain distance from the formwork, and then insert reinforced concrete into the formwork.

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