CN108660922B - Steel-Concrete Connection Structure and Its Shear Connections - Google Patents

Abstract

The invention discloses a steel-concrete connection structure and its shear force connector, comprising a steel-concrete structure connection formed by contacting the steel-concrete structure connection with the concrete structure connection, and also comprising a prefabricated steel-concrete structure connection The cast-in-place concrete channel, the cast-in-place concrete structure for the cast-in-place concrete channel, and the shear connector for removably clamping the steel-concrete connection through the concrete channel. The invention is simple to install and disassemble, and has high connection strength.

Description

Steel-Concrete Connection Structure and Its Shear Connections

technical field

The invention relates to the technical field of steel-concrete composite structures, in particular to a steel-concrete connection structure, its application and its shear connector.

Background technique

Prefabricated steel-concrete composite structures are widely used in construction projects because of their excellent mechanical properties, good durability, convenient construction and economy, especially in steel-concrete composite structure bridges. As a key component to ensure that the steel structure and the concrete structure work together, the shear connector plays a very important role. The manufacturing process of the existing prefabricated steel-concrete composite structure is as follows: the steel structure part and the concrete structure part are prefabricated in the factory, and are directly installed at the construction site through shear connectors, which can further increase the construction speed and reduce the construction cost , reduce traffic interruption time, etc., and factory prefabrication can improve the construction quality of concrete structures, which is a construction method with broad application prospects.

As a key force-transmitting component in a prefabricated steel-concrete composite structure (hereinafter referred to as composite structure), the form and type of shear connectors have a great influence on the overall mechanical performance of the composite structure. Different types of shear connectors correspond to The construction method is also very different. At present, the prefabricated steel-concrete composite structure can be mainly divided into two types according to different construction methods: the first type, firstly, the shear connectors are welded on the steel structure, and corresponding channels are reserved in the precast concrete structure, and the precast concrete The structure is placed on the steel structure according to the corresponding channel, and concrete is cast in the channel to form a combined structure; the second type, the steel structure and the prefabricated concrete structure respectively reserve corresponding bolt holes, after the prefabrication of the steel structure and the precast concrete structure is completed, The two are combined by high-strength bolts to form a composite structure. Different construction methods correspond to different shear connectors, but there are two problems with the shear connectors currently used: (1) Corresponding to the first type of composite structure, the shear connectors directly welded on the steel structure or embedded in the concrete Connectors, which have good mechanical properties, but this type of shear connector has the problem of easy installation but difficult disassembly, that is, when the steel-concrete composite structure is partially damaged, the entire concrete structure can only be destructively demolished. The steel structure and concrete structure cannot be fully utilized, resulting in low resource utilization; (2) Corresponding to the second type of composite structure bridges, high-strength bolts are used as shear connectors, which are very convenient to install and disassemble, and the resource utilization rate is high, but because There are unavoidable gaps between the bolts and the concrete structure and the steel plate, resulting in increased slippage and decreased mechanical properties of the composite beam when it is stressed.

Contents of the invention

The main purpose of the present invention is to provide a steel-concrete connection structure and its shear connectors, so as to solve the problems of difficult disassembly and low connection strength of the steel-concrete connection structure in the prior art.

In order to achieve the above object, the present invention provides a steel-concrete connection structure on the one hand, including a steel-concrete structure connection formed by the contact between the steel structure connection part and the concrete structure connection part, and also including a prefabricated steel-concrete structure connection part. A cast-in-place concrete channel, a cast-in-place concrete structure for pouring the cast-in-place concrete channel, and a shear connector for detachably clamping a steel-concrete structure connection through the cast-in-place concrete channel.

The present invention sets the cast-in-place concrete pouring channel on the steel-concrete structure connection part, pours the cast-in-place concrete pouring channel through the cast-in-place concrete, and clamps the steel-concrete structure connection part with a detachable shear force connector, thereby making the shear The force connector avoids the difficulty of installation and disassembly caused by direct welding or pre-embedding of the steel-concrete structure connection; when the steel-concrete structure is partially damaged, the cast-in-place concrete structure and the shear connector are directly disassembled during disassembly , and then replace the damaged steel structure or concrete structure part, and the undamaged components will not be damaged, and can be used repeatedly to improve the utilization rate of components.

The steel-concrete structure connection part in the present invention, on the one hand, connects the steel structure connection part and the concrete structure connection part by pouring in-situ concrete; The cast-in-place concrete structure strengthens the connection between the shear connector and the steel-concrete structure connection, avoids the decline in mechanical properties when the steel-concrete structure is stressed, and improves the connection strength of the steel-concrete connection structure.

Further, the cast-in-place concrete pouring channel includes a pouring port provided on the concrete structure connection part and a pouring hole communicated with the pouring port provided on the steel structure connection part. In this way, a cast-in-place concrete pouring channel connecting the connection part of the steel structure and the connection part of the concrete structure is formed.

Further, the shear connector includes a screw that passes through the pouring channel of the cast-in-place concrete, a pouring port pressure piece that fits through one end of the screw and compresses the pouring port, and fits through the other end of the screw and compresses the pouring hole. The pouring hole compression parts. The pouring mouth pressing piece compresses the pouring mouth and the cast-in-situ concrete structure near the pouring mouth, and the pouring hole pressing piece presses the pouring hole and the cast-in-situ concrete structure near the pouring hole, thereby realizing the pouring of the cast-in-place concrete in the pouring channel Clamping of concrete structures.

Further, the pouring port pressing member includes a nut and a pressing plate. The tightening of the nut acts on the compression plate to compress the cast-in-place concrete structure near the pouring port, the structure is simple, and the disassembly and assembly are convenient.

Further, the pouring port pressing member also includes a waterproof sealing structure arranged between the pressing plate and the nut. The waterproof and sealing structure improves the waterproof and sealing performance of the cast-in-place concrete structure of the compression plate near the pouring mouth.

Further, the inner ring of the pouring port is provided with a stepped opening for the pressing plate to be pressed together, and slope-shaped reserved openings are opened on both sides of the inner ring. The step mouth of the inner circle of the pouring mouth cooperates with the pressing plate to make the cast-in-place concrete structure near the pouring mouth tightly pressed.

Further, the casting hole pressing member includes a nut and a concave plate that seals and compresses the casting hole and forms a casting cavity therebetween. The concave plate is tightened by the nut, and the concave plate is convenient for receiving and compacting the cast-in-place concrete flowing in from the pouring port. The structure is simple, and the assembly and disassembly are convenient.

Further, the pouring hole pressing member also includes a waterproof sealing structure arranged between the nut and the concave plate, and a waterproof sealing structure arranged between the concave plate and the steel structure connecting part. The waterproof and sealing structure improves the waterproof and sealing performance of the cast-in-place concrete structure of the concave plate near the pouring hole.

Another aspect of the present invention provides a shear connector, including a screw, a pouring hole pressing piece that fits through one end of the screw, and a pouring hole pressing piece that fits through the other end of the screw. The parts include nuts and pressing plates, and the casting hole pressing parts include nuts and concave plates. The shear connector in the present invention has a simple structure and is convenient for installation and disassembly.

Further, it also includes a first gasket arranged between the nut and the pressing plate, a first waterproof gasket, a second gasket arranged between the nut and the concave plate, a second waterproof gasket and a gasket arranged in the concave plate. The third waterproof gasket at the notch end of the shaped plate. As a result, the waterproof and sealing performance of the shear connector is improved.

It can be seen that the present invention sets the cast-in-place concrete pouring channel on the steel-concrete structure connection part, pours the cast-in-place concrete pouring channel through the cast-in-place concrete, and clamps the steel-concrete structure connection part with detachable shear connectors, thereby The shear connector avoids the difficulty of installation and disassembly caused by direct welding or pre-embedding of the steel-concrete structure connection; when the steel-concrete structure is partially damaged, the cast-in-place concrete structure and the shear connector are directly damaged during disassembly. After dismantling, the damaged steel structure or concrete structure is replaced later. The undamaged components will not be damaged and can be used repeatedly to improve the utilization rate of components. The steel-concrete structure connection part in the present invention, on the one hand, connects the steel structure connection part and the concrete structure connection part through cast-in-place concrete pouring; , The cast-in-place concrete structure strengthens the connection between the shear connector and the steel-concrete structure connection, avoids the decline in mechanical properties when the steel-concrete structure is stressed, and improves the connection strength of the steel-concrete connection structure.

The invention is simple to install and disassemble, and has high connection strength. The invention is suitable for the connection of steel-concrete composite structures, especially for the connection of steel girders and prefabricated concrete slabs in steel-concrete composite structure bridges in the technical field of bridges.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to assist the understanding of the present invention, and the content provided in the accompanying drawings and related descriptions in the present invention can be used to explain the present invention, but do not constitute an improper limitation to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of an exploded structure of a steel-concrete connection structure in the present invention.

Fig. 2 is a schematic cross-sectional view of the steel-concrete connection structure in the present invention.

Fig. 3 is a structural schematic diagram of the connection part of the concrete structure in the present invention.

Fig. 4 is a structural schematic diagram of the connection part of the steel structure in the present invention.

Fig. 5 is a schematic diagram of the structure of each part after the shear connector is decomposed in the present invention.

Fig. 6 is a schematic diagram of an exploded structure of a shear connector in the present invention.

Fig. 7 is a schematic diagram of the application structure of the steel-concrete connection structure in the present invention.

The relevant marks in the above drawings are:

1: Concrete structure connection;

11: pouring mouth;

110: step entrance;

111: slope-shaped reserved opening;

2: steel structure connection;

21: pouring hole;

3: Shear connectors;

31: screw;

310: thread;

321: the first nut;

322: compression plate;

323: the first gasket;

324: the first waterproof gasket;

331: second nut;

332: concave plate;

3320: screw hole;

333: second gasket;

334: the second waterproof gasket;

335: the third waterproof gasket;

4: cast-in-place concrete structure;

A: Prefabricated concrete slab;

B: steel beam;

C: Steel-concrete connection structure.

Detailed ways

The present invention will be clearly and completely described below in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before the present invention is described in conjunction with the accompanying drawings, it should be pointed out that:

The technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other under the condition of no conflict.

In addition, the embodiments of the present invention referred to in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

About terms and units in the present invention. The terms "comprising", "having" and any variations thereof in the description and claims of the present invention and related parts are intended to cover a non-exclusive inclusion. The term "steel-concrete structure connection part" refers to the part to be connected that is formed by the contact between the steel structure connection part and the concrete structure connection part of the prefabricated structure and has not yet been connected together by connecting means.

The specific embodiment of the present invention provides a steel-concrete connection structure, which includes a steel-concrete structure connection formed by contacting the steel structure connection part 2 with the concrete structure connection part 1, and also includes a steel-concrete structure connection part prefabricated on the steel-concrete structure connection part. A cast-in-place concrete channel, a cast-in-place concrete structure 4 for pouring the cast-in-place concrete channel, and a shear connector 3 that passes through the concrete pouring channel and detachably clamps the steel-concrete connection.

The cast-in-place concrete pouring channel includes a pouring port 11 arranged on the concrete structure connecting portion 1 and a pouring hole 21 arranged on the steel structure connecting portion 2 and communicating with the pouring port 11 .

The shear connector 3 includes a screw 31 passing through the pouring channel of the cast-in-place concrete, a pouring port compression member that is fitted through one end of the screw 31 and pressed against the pouring port 11, and fitted through the other end of the screw 31 and pressed against it. The pouring hole pressing part of the pouring hole 21.

The pouring port pressing member includes a nut and a pressing plate 322 .

The pouring port pressing member also includes a waterproof sealing structure arranged between the pressing plate 322 and the nut.

The inner ring of the pouring port 11 is provided with a stepped opening 110 for pressing with the pressing plate 322, and slope-shaped reserved openings 111 are opened on both sides of the inner ring.

The casting hole pressing member includes a nut and a concave plate 332 that seals and compresses the casting hole 21 and forms a casting cavity therebetween.

The pouring hole pressing member also includes a waterproof sealing structure arranged between the nut and the concave plate 332 and a waterproof sealing structure arranged between the concave plate 332 and the steel structure connection part 2 .

The specific embodiment of the present invention also provides a shear connector 3, which includes a screw 31, a pouring hole pressing piece that fits through one end of the screw 31, and a pouring hole pressing piece that fits through the other end of the screw 31. The casting hole pressing piece includes a first nut 321 and a pressing plate 322 , and the casting hole pressing piece includes a second nut 331 and a concave plate 332 . It also includes a first gasket 323 arranged between the first nut 321 and the pressing plate 322, a first waterproof gasket 324, a second gasket 333 arranged between the second nut 331 and the concave plate 332, and a second gasket 333 arranged between the second nut 331 and the concave plate 332. Two waterproof gaskets 334 and a third waterproof gasket 335 arranged at the end of the notch of the concave plate 332 .

The present invention will be further described below by the application of the present invention in fabricated steel-concrete composite bridge:

As shown in FIGS. 1-2 , the steel-concrete connection structure of the present invention includes a concrete structure connection part 1 , a steel structure connection part 2 , a shear connector 33 , and a cast-in-place concrete structure 4 .

Wherein, as shown in FIG. 3 , the concrete structure connecting portion 1 is provided with a pouring port 11 .

Wherein, as shown in FIG. 4 , the steel structure connection part 2 is provided with a pouring hole 21 communicating with the pouring port 11 .

The steel-concrete structure connecting portion 2 is in contact with the concrete structure connecting portion 1, and the pouring port 11 and the pouring hole 21 together constitute a cast-in-place concrete pouring channel for pouring in-situ concrete.

Wherein, as shown in Figures 5-6, the shear connector 3 includes a screw 31, a pouring hole pressing piece that fits through one end of the screw 31, and a pouring hole pressing piece that fits through the other end of the screw 31. The casting hole pressing piece includes a first nut 321 and a pressing plate 322 , and the casting hole pressing piece includes a second nut 331 and a concave plate 332 . It also includes a first gasket 323 arranged between the first nut 321 and the pressing plate 322, a first waterproof gasket 324, a second gasket 333 arranged between the second nut 331 and the concave plate 332, and a second gasket 333 arranged between the second nut 331 and the concave plate 332. Two waterproof gaskets 334 and a third waterproof gasket 335 arranged at the end of the notch of the concave plate 332 . Both the concave plate 332 and the pressing plate 322 are provided with screw holes 3320 for the screw rod 31 to pass through. Both ends of the screw rod 31 are matched and provided with threads 310 .

As shown in Figure 2, in this specific embodiment, a pouring hole 21 is respectively provided on both sides of the steel beam as the steel structure connection part 2, and the two pouring holes 21 are all communicated with the pouring port 11, so in the specific embodiment of the present invention In the embodiment, a shear connector 3 includes two left and right screw rods 31 and two concave plates 332 respectively connected to the screw rods 31 , and the upper ends of the two screw rods 31 share a pressing plate 322 . Therefore, in the present invention, the number of pouring holes 21 and the number of screw rods 31 can be increased or decreased according to specific conditions. The pressing plate 322 is used to transmit the pre-tightening force of the shear connector 3 to the concrete structure connection part 1 , and the concave plate 332 is used to transmit the pre-tightening force of the shear connection part 3 to the steel structure connection part 2 .

As shown in Figure 1-2 again, the screw rod 31 passes through the above-mentioned cast-in-place concrete pouring channel, the first nut 321 is tightened to compress the pressing plate 322 on the pouring port 11 on the concrete structure connection part 1, and the second nut 331 is tightened to The concave plate 332 is pressed against the pouring hole 21 on the steel structure connection part 2, and the cast-in-place concrete is poured in the cast-in-place concrete pouring channel. In the cavity formed by the plate 332, the cast-in-place concrete forms the cast-in-place concrete structure 4 between the compression plate 322 and the concave plate 332, so that the cast-in-place concrete structure 4 pours the above-mentioned cast-in-place concrete pouring channel, and the above-mentioned The first waterproof gasket 324, the second waterproof gasket 334, and the third waterproof gasket 335 have improved the waterproof performance of the shear connector 3, and the first gasket 323 and the second gasket 333 have improved the waterproof performance of the shear connector 3. Sealing performance.

As shown in FIG. 3 , the inner ring of the pouring port 11 is provided with a step opening 110 for pressing with the pressing plate 322 , and slope-shaped reserved openings 111 are opened on both sides of the inner ring.

The step opening 110 of the inner circle of the pouring opening 11 and the slope-shaped reserved openings 111 on both sides of the inner circle can ensure that the precast concrete slab and steel girder of the bridge can also be connected smoothly in the case of certain construction errors. The structure of the above-mentioned pouring port 11 can not only enhance the mechanical bite force between the cast-in-place concrete structure 4 and the overall precast concrete slab of the bridge, resist the lifting action of the precast concrete slab during the stress process, but also provide a pre-tightening platform for high-strength bolts, Ensure that high-strength bolts can provide pre-tightening force.

In this specific embodiment, preferably, the diameter of the pouring hole 21 is three times the diameter of the screw rod 31 .

Preferably, the pressing plate 322 is made of concrete slab or steel plate, the concave plate 332 and each gasket are made of steel, and each waterproof gasket is made of rubber gasket.

As shown in Fig. 7, it is the application of the present invention in a fabricated steel-concrete composite bridge. The prefabricated concrete slab A and the steel beam B are combined and assembled through several steel-concrete connection structures.

In this specific embodiment, the concrete structure connection part 1 is the connection part on the precast concrete slab structure, and the steel structure connection part 2 is the connection part on the steel beam structure.

The concrete construction method of the application of the present invention in the fabricated steel-concrete composite bridge is as follows:

(1) According to the width and span of the actual bridge, determine the size of the precast concrete slab segment, then determine the size of the detachable shear parts and the number of shear connectors 3, and prefabricate the precast concrete slab with pouring openings in the factory , prefabricated steel beams with pouring holes.

(2) Purchase corresponding high-strength bolts (including screws and nuts) and gaskets according to the shear resistance requirements of the composite structure bridge; Delivered to the assembled steel-concrete composite bridge assembly site for assembly.

(3) After the assembly of the prefabricated steel-concrete composite bridge is completed, the precast concrete slab is hoisted to the corresponding position above the steel beam. First, the first nut 321 in the shear connector 3 is screwed on one end of the screw rod 31, and then the screw rod passes through the pressing plate 322, the first gasket 323, the first waterproof gasket 324, the pouring port 11, the pouring hole 21, The third waterproof gasket 335, the concave plate 332, the second waterproof gasket 334, the second gasket 333, and then the second nut 331 is screwed on the other end of the screw rod 31, and the above-mentioned screw rod 31 is initially twisted, and each shear force After the connectors 3 are installed in this order, each screw rod 31 is finally torqued with a torque wrench.

(4) Pour ultra-high-performance concrete in the pouring port 11 until the space between the compression plate 322 and the concave plate 332 is completely filled with ultra-high-performance concrete. After curing, proceed to the next section of construction until the assembled steel-concrete Composite bridge construction completed.

The content related to the present invention has been described above. Those skilled in the art will be able to implement the present invention based on these descriptions. Based on the above content of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Claims (3)

1. The steel-concrete connection structure, including the steel-concrete structure connection part formed by the contact between the steel structure connection part (2) and the concrete structure connection part (1), is characterized in that it also includes prefabrication and setting on the steel-concrete structure connection part The cast-in-place concrete pouring channel, the cast-in-place concrete structure (4) for pouring the cast-in-place concrete pouring channel, and the shear connector (3) that passes through the concrete pouring channel and detachably clamps the steel-concrete connection; The cast-in-place concrete pouring channel includes a pouring port (11) arranged on the concrete structure connection part (1) and a pouring hole (21) provided on the steel structure connection part (2) and communicating with the pouring port (11); The shear connector (3) includes a screw (31) passing through the pouring channel of the cast-in-place concrete, a pouring port pressing piece that fits through one end of the screw (31) and presses the pouring port (11), and a fitting The pouring hole pressing piece on the other end of the screw rod (31) and compresses the pouring hole (21); The pouring port pressing member includes a nut and a pressing plate (322); The inner ring of the pouring mouth (11) is provided with a step opening (110) for the compression plate (322) to cooperate with and compacts, and there are slope-shaped reserved openings (111) on both sides of the inner ring; The pouring hole pressing piece includes a nut and a concave plate (332) that seals and compresses the pouring hole (21) and forms a pouring cavity therebetween. 2. The steel-concrete connection structure according to claim 1, characterized in that, the pouring port pressing member further comprises a waterproof sealing structure arranged between the pressing plate (322) and the nut. 3. The steel-concrete connection structure according to claim 1, characterized in that, the pouring hole pressing part also includes a waterproof sealing structure arranged between the nut and the concave plate (332), and a waterproof sealing structure arranged on the concave plate (332). (332) and the waterproof sealing structure between the steel structure connection part (2).