CN201406767Y - Nodes for the connection of circular steel pipe concrete columns and reinforced concrete floors - Google Patents

Abstract

The utility model discloses a node used for connecting a circular steel pipe concrete column and a reinforced concrete floor. Concrete is poured inside the round steel pipe, and at least one shear ring bar is pasted and welded on the outside of the steel pipe along the circumference of the steel pipe; the ring beam is located outside the round steel pipe, and the reinforcement cage is composed of steel bars arranged in the circumferential direction and stirrups arranged radially in the radial direction. Concrete is poured to form a monolithic concrete floor. During preparation, the prefabricated ring beam reinforcement cage is processed on the construction site or in the factory. After the reinforcement cage is hoisted, the frame beams of the floor are bound, and then the ring beam and the concrete of the floor are poured at the same time to form an integral concrete floor. The joint steel pipe of the utility model has no core-through members and stiffening ring plates, the steel pipe section has no weakening, does not affect the pouring of concrete in the pipe, the joint force transmission is reasonable, the force is clear, the form is simple, the bearing capacity is high, the seismic performance is good, and the construction is convenient. And it is relatively economical, which has great significance and good engineering application prospects for further promoting the application of steel pipe concrete structures in engineering.

Description

Nodes for the connection of circular steel pipe concrete columns and reinforced concrete floors

technical field

The utility model relates to a connection node between a concrete column and a concrete beam in structural engineering in civil engineering, in particular to a novel node used for connecting a circular steel tube concrete column and a reinforced concrete floor.

Background technique

In the mid-1960s, especially after the 1990s, CFST has been widely used in high-rise and super high-rise buildings, long-span bridges and other projects in my country due to its excellent mechanical properties and cost performance. On the one hand, due to the restraining effect of the steel pipe on the filled concrete, the concrete is in a stress state of three-dimensional compression, so that its compressive strength can be fully exerted; on the other hand, due to the filling effect of the concrete, the buckling resistance of the steel pipe under the action of axial force is improved. ability. With its very reasonable combination of materials, the steel tube concrete structure can give full play to and utilize the respective characteristics of steel and concrete materials, achieve complementary advantages in performance, improve the bearing capacity of components, and have good plasticity and toughness at the same time. The application of high-strength steel provides a new way. The use of concrete-filled steel tube structures (especially circular concrete-filled steel tube columns) can save a lot of building materials and facilitate construction, and the economic benefits are also obvious.

At the same time, due to the current national conditions of our country, high-rise buildings will mainly adopt cast-in-place reinforced concrete beam-slab floors now and for a long time in the future. How to solve the connection between the steel pipe concrete column and the reinforced concrete beam-slab floor has been perplexing the engineering field. As a concrete-filled steel tube beam-column joint, it must be able to reliably transmit the shear force and bending moment from the beam-slab, and the force transmission path must be direct and clear, with sufficient ductility to meet the requirements of "strong columns and weak beams, strong nodes, and weak members." "Seismic Design Principles. Therefore, the connection between the steel tube concrete column and the reinforced concrete floor is one of the key technologies that must be solved.

At present, the concrete-filled steel pipe columns and other connection nodes of reinforced concrete floors used in engineering have complex structures to varying degrees, heavy welding workload, complicated installation, hindering the pouring of concrete in the pipes, and opening holes in the steel pipe wall affect the bearing capacity of the concrete-filled steel pipe columns. Strength and other shortcomings. Proposing a new connection node between concrete-filled steel tube columns and reinforced concrete beam-slab floors with reasonable force transmission, safety and economy, and convenient construction has become the key to give full play to the advantages of concrete-filled steel tube structures and popularize concrete-filled steel tube structures, and it is an urgent problem to be solved in the engineering field .

Utility model content

The purpose of the utility model is to provide a joint for connecting circular steel pipe concrete columns and reinforced concrete floors with clear force transmission, fully guaranteed safety and reliability of joints, convenient construction, material saving and economical.

The purpose of this utility model is achieved through the following technical solutions:

The node used to connect the circular steel pipe concrete column to the reinforced concrete floor, including circular steel pipes, floor frame beams or beamless floor slabs, ring beams and shear rings welded on the outside of the circular steel pipes; concrete is poured inside the circular steel pipes , at least one shear ring bar is pasted and welded on the outside of the steel pipe along the circumference of the steel pipe; the ring beam is located on the outside of the round steel pipe, and a reinforcement cage is formed by steel bars arranged in the circumferential direction and stirrups arranged radially in the radial direction; the ring beam The height of the section is greater than the section height of the frame beam of the floor or the thickness of the slab without beam, the section width of the ring beam is not less than the section width of the frame beam or the thickness of the slab without beam, the reinforcement of the frame beam of the floor or the reinforcement of the slab of the slab Anchored in the ring beam and poured with concrete to form an integral concrete floor.

To further realize the purpose of the utility model, the ring beam stirrups are arranged radially.

When the height of the ring beam is greater than or equal to 450mm, ring ribs are arranged along the height direction on both sides of the ring beam, the diameter of the ribs is not less than 12mm, and the distance between them is not greater than 200mm.

The anchorage length of the steel bar of the floor beam slab into the ring beam is greater than or equal to the corresponding anchorage length LaE.

The shear ring is a round or square steel bar.

The section height of the ring beam is 50mm greater than the section height of the floor frame beam or the thickness of the beamless floor slab.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) This utility model proposes a new type of joint between the circular steel pipe concrete column and the reinforced concrete floor. A reinforced concrete ring beam is arranged around the circular steel pipe concrete column to transmit the bending moment at the end of the frame beam. In the middle or bottom of the ring beam The outer surface of the steel pipe is pasted and welded with circular (or square) steel bars, which are called shear rings and are used to transmit shear force. The production process is simple, the force is reliable and reasonable, the steel consumption is small, and the cost is low.

(2) The joint bearing capacity is high, and the seismic performance is good. The bearing capacity of the node is higher than the bearing capacity of the floor frame beam connected to it; the application of the shear ring has a high safety reserve; Weak beam" seismic structural requirements.

(3) The node ring beam has no directionality, is easy to install, and is convenient to connect with frame beams in any direction.

(4) The construction is convenient. The binding requirements of reinforced concrete ring girder steel cage are the same as those of ordinary concrete beams; the shear ring is only connected to the steel pipe wall through fillet welds, and the welding workload is small, and it can be completed in the factory; except for the extension of the steel pipe In addition, there is no welding workload on site, and the construction is convenient.

(5) There are no core-piercing members and stiffening ring plates inside the steel pipe, no holes need to be opened in the steel pipe wall, and the cross section of the steel pipe is not weakened, which can ensure the cross-sectional bearing capacity of the steel pipe concrete column and facilitate the pouring of concrete inside the pipe.

Description of drawings

Figure 1 is a top view of the joint between the circular steel pipe concrete column and the reinforced concrete floor.

Fig. 2 is a front view of the connection node between the circular steel pipe concrete column and the reinforced concrete floor.

Fig. 3 is a sectional view taken along line A-A of Fig. 2 .

Fig. 4 is a sectional view taken along line B-B of Fig. 1 .

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation of the utility model is not limited thereto.

As shown in Figures 1, 2, 3, and 4, the nodes used to connect the circular steel pipe concrete column to the reinforced concrete floor include: circular steel pipe 1, floor frame beam 2, ring beam 3, ring beam inner ring reinforcement 4, ring Beam outer ring reinforcement 5, ring beam stirrup 6, shear ring 7. The ring beam 3 is located on the outer side of the round steel pipe 1, and the ring beam 3 is formed into a ring structure by concrete pouring of the upper and lower ring beam inner ring steel bars 4, ring beam outer ring steel bars 5 and ring beam stirrup bars 6, wherein the ring beam inner ring steel bars 4, ring beam The beam outer ring reinforcement 5 and the ring beam stirrup 6 are bound to form a reinforcement cage, the ring beam inner ring reinforcement 4 and the ring beam outer ring reinforcement 5 are arranged on the upper and lower parts of the ring beam, and the ring beam stirrup 6 is bound to the ring beam inner ring reinforcement 4 and the ring beam. On the outer ring steel bar 5 of the beam, the distance between the ring beam stirrups 6 is determined by force calculation, and the ring beam stirrups 6 are radially arranged; when the beam height is ≥ 450 mm, they are arranged along the height direction on both sides of the ring beam Circumferential waist reinforcement, the diameter of the waist reinforcement is not less than 12mm, and the distance between them is not greater than 200mm; the section height of the ring beam 3 is greater than the height of the floor frame beam section 2 or the thickness of the beamless floor slab, preferably greater than 50mm; the section width of the ring beam 3 Not less than the width of the frame beam section or the thickness of the beamless floor, the steel bars of the floor frame beam 2 or the steel bars of the beamless floor slab are anchored in the ring beam 3, and the integral concrete floor is formed by pouring concrete; For concrete, the shear ring on the outside of the pipe wall is welded horizontally against the shear ring. The shear ring 7 is a round or square steel bar, and the welding between the shear ring 7 and the outer wall of the steel pipe column 1 adopts a fillet weld.

The floor frame beam 2 is a reinforced concrete beam, and the upper longitudinal bars 8 of the frame beam, the lower longitudinal bars 9 of the frame beam and the stirrups 10 of the frame beam constitute the steel bar structure of the floor frame beam 2 . The anchoring of the steel bars of the floor frame beam 2 in the ring beam 3 means that the upper longitudinal bars 8 of the frame beam and the lower longitudinal bars 9 of the frame beam extend into the ring beam 3 and meet the requirements of the seismic anchorage length LaE. The steel bars of the beamless floor slab are anchored in the ring beam 3 and the manufacturing method is the same as that of the floor frame beam 2.

The preparation process of the joint between the circular steel pipe concrete column and the reinforced concrete floor is as follows:

The first step is to determine the cross-sectional size of the reinforced concrete ring beam 3. The cross-sectional height of the ring beam 3 is 50 mm larger than the intersecting floor frame beam 2, and the floor frame beam 2 with the largest cross-sectional height is used for comparison; the cross-sectional width of the ring beam 3 is different. It is smaller than the section width of the frame beam 2 with the largest section width intersecting with it, and meets the length of the anchoring horizontal section of the longitudinal reinforcement 8 of the frame beam. Node formwork is completed at the same time as the floor.

The second step is to paste and weld the shear ring 7 on the outer side of the steel pipe wall of the circular steel pipe concrete column. There are two shear rings, one in the middle of the ring beam and the other in the lower part.

The third step is to make a reinforcement cage around the reinforced concrete ring beam 3 of the circular steel pipe concrete column 1 . The number of ring bars and stirrups of the reinforcement cage is determined by calculation and construction.

The fourth step is to make a reinforcement cage on the ground or other working surfaces according to the determined amount and geometric dimensions of the ring reinforcement and stirrup reinforcement.

Step 5 After the hoisting of the steel cage is completed, the frame beam and floor steel bars are extended into the ring beam for anchoring. After the side formwork of the ring beam is sealed, concrete can be poured to form an integral concrete floor (concrete pouring in the steel tube concrete should be poured before the floor pouring, otherwise the support should be kept to avoid stress on the empty steel pipe).

This example is used in the connection between the circular steel pipe concrete column and the reinforced concrete floor. The steel pipe is Q345B, the concrete strength is the same as that of the floor concrete, the strength of the ring beam steel is the same as that of the floor frame beam, both are grade III steel, and the welding rod is made of E50 type, flux 5014, the fillet weld between the shear ring and the steel pipe wall meets the quality requirements of the third-grade weld.

As mentioned above, the utility model can be better realized.

Claims (6)

1. The node used to connect the circular steel pipe concrete column and the reinforced concrete floor, which is characterized in that it includes a circular steel pipe, a floor frame beam or a beamless floor slab, a ring beam and a shear ring welded on the outside of the circular steel pipe; Concrete is poured inside the circular steel pipe, and at least one shear ring bar is pasted and welded on the outside of the steel pipe along the circumference of the steel pipe; cage; the ring beam section height is greater than the floor frame beam section height or the thickness of the beamless floor slab, the ring beam section width is not less than the frame beam section width or the thickness of the beamless floor, and the reinforcement of the floor frame beam or The steel bars of the beam floor slab are anchored in the ring beam, and poured with concrete to form an integral concrete floor. 2. The node for connecting the circular steel pipe concrete column and the reinforced concrete floor according to claim 1, characterized in that: the ring beam stirrups are radially arranged. 3. The node used for connecting the circular steel pipe concrete column and the reinforced concrete floor according to claim 1, characterized in that: when the height of the ring beam is ≥ 450mm, the two sides of the ring beam are arranged along the height direction. Waist tendon, the diameter of the waist tendon is not less than 12mm, and the distance between them is not greater than 200mm. 4. The node for connecting the circular steel pipe concrete column and the reinforced concrete floor according to claim 1, characterized in that: the anchorage length of the steel bar of the floor beam slab into the ring beam is greater than or equal to the corresponding anchorage length. 5. The node used for connecting the circular steel pipe concrete column and the reinforced concrete floor according to claim 1, wherein the shear ring is a circular or square steel bar. 6. The node used for connecting the circular steel pipe concrete column and the reinforced concrete floor according to claim 1, characterized in that: the section height of the ring beam is greater than the section height of the floor frame beam or the thickness of the beamless floor slab by 50mm .

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