CN205242848U - Adopt prefabricated assembled steel - concrete combination beam of high strength bolt connection - Google Patents

Abstract

The utility model discloses a prefabricated assembled steel-concrete composite beam connected by high-strength bolts, which mainly includes a steel beam, a prefabricated reinforced concrete slab and a shear bolt connection pair, in which reasonable The steel beam and the prefabricated concrete slab are connected by using the shear bolt connection pair, so that the beam-slab connection can obtain greater ductility and deformation capacity under the condition that the shear bearing capacity of the beam-slab connection is not much lower than that of the rigid connection . When the prefabricated slab needs to be replaced, the nuts of the shear bolts can be removed to separate the prefabricated slab from the steel beam, thereby realizing the removal and replacement of the prefabricated slab. All components used in the utility model are connected by on-site assembly, which reduces on-site welding work and template engineering, improves the efficiency of building industrialization assembly, and realizes the functions of detachment, separation and replacement of the beam-slab main components of the assembled composite structure , which embodies the new architectural concept of detachable building components, energy saving and environmental protection.

Description

A prefabricated steel-concrete composite beam connected by high-strength bolts

technical field

The utility model belongs to the technical field of engineering structures, and is particularly suitable for multi-high-rise assembled steel-concrete composite structure beam-slab floor structure systems and bridge structure systems.

Background technique

The "Twelfth Five-Year Plan" of the construction industry proposes to actively promote the industrialization of construction, and the development of prefabricated buildings is a major way to realize the industrialization of construction. At present, domestic prefabricated concrete buildings are adopted by some engineering projects due to their advantages of fast construction speed and high quality level. However, due to their disadvantages such as high production cost, difficult construction and non-removable modification, they cannot meet the design or construction requirements in many building forms. , To a large extent, it limits the development of prefabricated concrete buildings. At the same time, my country is the country with the largest steel output in the world. In 2014, China ranked first in the world with 820 million tons of crude steel production. Excess steel production not only affects the country's economic development but also causes waste of resources. How to make rational use of excess steel has become one of the country's major development strategies. The development of steel structure buildings has the characteristics of good earthquake resistance, fast construction speed, and recyclable steel materials, which meet the requirements of green buildings and building industrialization. Since 2000, steel-structured houses, bridge structures, and special structures have been constructed throughout the country. However, due to various economic and technical reasons, most of the pilot projects are still designed with cast-in-place or fabricated reinforced concrete structures. However, the advantages of steel structures have not been fully utilized, which in turn has affected the popularization and application of steel structure building systems, especially multi-high-rise steel structure residences, bridge structures and special structures.

At present, the application of prefabricated structural connection forms in multi-high-rise steel structure residences, bridge structures and special structures has become a project promoted by the country. The diversity of steel structure systems in these building designs and the steel structure buildings can be better. It has become the main exploration direction of contemporary structural design engineers to become a green building that is easy to dismantle and modify, energy-saving and environmentally friendly, and establish a new type of industrialized prefabricated building system that meets the needs of sustainable development.

Beam-slab composite connection is one of the important components of multi-story steel frame structures, bridge structures and special structures. Taking the multi-story steel frame structure as an example, the beam-slab composite connection plays the role of transmitting and distributing internal forces and ensuring the integrity of the structure in the frame structure, which has a significant impact on the force and safety of the entire structure. Compared with the traditional cast-in-place concrete composite slab, the prefabricated prefabricated composite slab can reduce the workload of concrete wet work and shorten the construction period. The pouring and processing of a large number of concrete prefabricated panels are prefabricated in the factory, which can save the construction site. Complicated processes such as tying steel bars, supporting formwork, and removing formwork speed up the construction progress, realize the industrialization of steel structures and steel-concrete composite structural systems, and reduce the impact of construction on the environment while ensuring quality.

In most traditional multi-high-rise residential buildings, cast-in-place reinforced concrete structures are generally used. In order to avoid the stress concentration phenomenon in the connection parts of the steel bars, more complex structural measures need to be set up to ensure that the force is reasonable, resulting in a large amount of materials and structural problems. Complicated, difficult to design, difficult to construct and bulky in structure, affecting the beauty and use of the building. Seeking a new type of steel-concrete composite structure system with good seismic performance, fast construction speed, and recyclable building materials, and taking advantage of the combination of prefabricated steel structures and concrete structures to meet the needs of energy conservation, environmental protection, and building industrialization are becoming more and more important. more prominent.

Utility model content

Aiming at the deficiencies in the prior art above, the utility model provides a prefabricated steel-concrete composite beam with simple structure, excellent anti-seismic performance, convenient and efficient installation, easy dismantling, energy saving, environmental protection, beautiful appearance and firmness.

The utility model is achieved through the following technical solutions:

A prefabricated assembled steel-concrete composite beam connected by high-strength bolts, mainly including a steel beam, a prefabricated reinforced concrete slab and a shear bolt connection pair, characterized in that the inner and outer surfaces of the H-shaped steel beam are parallel and the upper wing Holes are reserved at positions symmetrical to the left and right sides of the web. In order to ensure that the shear bearing capacity of the bolts can fully function, the spacing of the reserved holes along the axis of the steel beam and perpendicular to the axis of the beam should meet the relevant specifications and structural requirements.

The shear bolt connection pair is composed of shear bolts, nuts and washers. The bolts are connected by a high-strength friction type, and the slippage between the bolts and the steel beam flange plates is reduced by applying a pre-tightening force.

The prefabricated reinforced concrete slab reserves through holes corresponding to the bolt holes provided by the steel beams for placing shear bolt connections.

The through-hole reserved for the prefabricated reinforced concrete slab is filled with non-shrinkage self-compacting high-strength concrete whose strength grade is not lower than the concrete grade of the prefabricated reinforced concrete slab.

The beam and plate components of the assembled composite beam can realize the functions of disassembly, separation and replacement.

The beneficial effects of the utility model are:

Compared with the prior art, the advantages of the utility model are reflected in:

1. The utility model adopts prefabricated assembled steel-concrete composite beams connected by high-strength bolts. All components are processed in the factory. After being transported to the construction site, they can be assembled and connected at the construction site, which reduces on-site welding work and form work, ensuring Improve the quality of on-site construction and improve the efficiency of building industrial assembly.

2. The utility model reserves rationally designed structural measures on the steel beam and the prefabricated concrete slab, uses the shear bolt connection pair to connect the steel beam and the prefabricated concrete slab, and then grouts the reserved through hole. The poured mortar is non-shrinkage self-compacting high-strength concrete, which forms a whole with the shear bolt connection and then bears the force together, so that the shear bearing capacity of the beam-slab connection is not much lower than that of the rigid connection. Large ductility and deformation capacity, and reasonable force transmission in the form of bolt connection, even after rare earthquakes, the cost of repair and replacement is small, making the overall structure more superior in energy dissipation capacity and ductility.

3. The connection between the steel beam and the concrete slab of the utility model adopts high-strength friction bolts, and by applying pre-tightening force to reduce the slip between the bolts and the concrete precast slab, the lateral displacement of the concrete precast slab is effectively restrained. The shear bolts are anchored on the steel beams after being tightened with nuts, which can realize the function of the concrete precast slab being replaced and disassembled. When the building structure is subjected to frequent earthquakes or impacts, the structural components of the building will be damaged to a certain extent, such as cracking of the prefabricated concrete slab. However, if the main structure can continue to be used, the nuts on the shear bolts can be , so that the concrete prefabricated slab is separated from the steel beam, and then the disassembly, separation and replacement of the concrete prefabricated slab are realized. The replaced damaged concrete prefabricated slabs can be recovered, reinforced, and recycled, reflecting the architectural concepts and ideas of convenient and efficient installation, easy dismantling and modification, and environmental protection and energy saving.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the overall structure of the utility model;

Fig. 2 is the overall top view schematic diagram of the utility model;

Fig. 3 is the overall side view schematic diagram of the utility model;

Fig. 4 is the three-dimensional schematic diagram of the section of the concrete prefabricated panel of the present invention;

Fig. 5 is a three-dimensional schematic diagram of a steel beam of the present invention;

Fig. 6 is a schematic plan view of the shear bolt connection assembly of the present invention.

Numbers in the figure: 1 is H-shaped steel beam, 2 is reserved hole for steel beam, 3 is prefabricated reinforced concrete slab, 4 is shear bolt, 5 is nut, 6 is spacer, 7 is grouted concrete, 8 is prefabricated Through holes are reserved for the plates, and 9 is the connection pair of shear bolts.

detailed description

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

The utility model provides a prefabricated assembled steel-concrete composite beam connected by high-strength bolts. As shown in Figures 1 to 3, the main components of the structural system include H-shaped steel beams 1, prefabricated reinforced concrete panels 3 and shear bolts Deputy 9.

As shown in FIG. 4 , the assembly connection between the H-shaped steel beam 1 and the prefabricated reinforced concrete slab 3 is performed through a detachable shear bolt connection pair 9 . As shown in Figure 2 and Figure 5, holes are reserved for the prefabricated reinforced concrete slab 3 and the H-shaped steel beam 1. After the installation of the shear bolt connection pair 9 is completed, the prefabricated reinforced concrete slab 3 is hoisted to the H-shaped steel beam 1 Then grout the through holes in the prefabricated reinforced concrete slab 3. The poured concrete mortar is non-shrinkage self-compacting high-strength concrete, and its strength grade is not lower than the concrete grade of the prefabricated reinforced concrete slab.

As shown in FIG. 6 , the shear bolt connection pair 9 includes shear bolts 4 , nuts 5 and washers 6 . The shear bolt 4 is installed on the part above the upper flange of the steel beam 1 by using the nut 5 and the washer 6 to form an anchoring effect, and then the part below the upper flange of the steel beam 1 is connected by the nut 5 and the washer 6 with the steel Beams are fastened. When the concrete prefabricated slab 3 needs to be replaced, it is only necessary to unscrew the nuts 5 on the shear bolts 4 sequentially, and the concrete prefabricated slab 3 can be disassembled and replaced as a whole.

So far, the technical solution of the utility model is specifically to provide a prefabricated assembled steel-concrete composite beam that can be quickly assembled and has the ability to be disassembled and modified.

The installation method of the utility model structure is:

1. Except for the on-site grouting of the through-holes of the prefabricated slabs, all components are prefabricated in the factory, and the holes reserved on the H-shaped steel beam 1 should meet the specifications and structural requirements. The structure of the reserved hole on the prefabricated reinforced concrete slab 3 should correspond to and match with the reserved hole on the H-shaped steel beam 1 (shown in Fig. 2 and Fig. 5);

2. Connect the shear bolts to the pair 9. Each reserved hole needs to be prepared to include 1 shear bolt 4, 2 nuts 5 and 2 washers 6. Use the bolts above the upper flange of the steel beam 1 Install the cap 5 and the gasket 6 to form an anchoring effect, and then use the nut 5 and the gasket 6 to connect and fasten the part below the upper flange of the steel beam 1 with the steel beam (shown in Figure 4 and Figure 6);

3. Assemble the prefabricated reinforced concrete slab 3 onto the H-shaped steel beam 1, so that the reserved holes of the two can be aligned and penetrate up and down. The shear bolt connection pair 9 also plays the role of positioning, which can help the holes of the beam-slab members to be aligned (shown in Fig. 1 and Fig. 3);

4. Grouting the through holes in the prefabricated reinforced concrete slab 3, the poured mortar is non-shrinkage self-compacting high-strength concrete, and finally forms a prefabricated assembled steel-concrete composite beam (as shown in Figure 1);

5. If the prefabricated reinforced concrete slab 3 needs to be disassembled, the nut 5 on the shear bolt 4 can be removed to separate the prefabricated reinforced concrete slab 3 from the H-shaped steel beam 1 as a whole. Repeat 2-4 installation steps to complete the reassembly of the composite beam (shown in Figures 1-6).

Claims (4)

1. A prefabricated assembled steel-concrete composite beam connected by high-strength bolts mainly includes H-shaped steel beams, prefabricated reinforced concrete slabs and shear bolt connection pairs, and is characterized in that the inner and outer surfaces of the H-shaped steel beams Parallel and the upper flange shall reserve holes at positions symmetrical to the left and right sides of the web; in order to ensure that the shear bearing capacity of the bolts can fully function, along the steel beam axis and perpendicular to the beam axis, the distance between the reserved holes should be Meet relevant code and construction requirements. 2. A prefabricated assembled steel-concrete composite beam connected by high-strength bolts according to claim 1, wherein said shear bolt connection pair is composed of shear bolts, nuts and gaskets; the bolts are High-strength friction-type connections that reduce slippage between the bolt and the steel beam flange by applying a preload. 3. A prefabricated assembled steel-concrete composite beam connected by high-strength bolts according to claim 1, characterized in that the prefabricated reinforced concrete slab reserves bolt holes corresponding to the steel beams for placing anti-corrosion beams. Cut the through hole of the bolt connection pair. 4. A prefabricated assembled steel-concrete composite beam connected by high-strength bolts according to claim 3, characterized in that the through-hole reserved for the prefabricated reinforced concrete slab is filled with non-shrinkage self-compacting high-strength concrete, and its strength The grade of concrete shall not be lower than that of prefabricated reinforced concrete slabs.