A steel-concrete transverse joint structure in the negative moment zone

Abstract

The invention discloses a steel-concrete transverse joint section structure in a negative bending moment zone, relates to the technical field of design and construction of bridge engineering, and solves the technical problem that when the transverse width of a steel-concrete composite beam is large, a series of problems are caused by the concrete in the negative bending moment zone of the transverse bridge being easily tensilely cracked, thereby reducing the service life of the bridge. By means of a joint section top plate, a joint section end plate, a joint section bottom plate, a joint section stiffening longitudinal rib, a joint section stiffening longitudinal rib bottom plate, a joint section bottom bolt, a joint section top bolt, and vertical healthy teeth, not only a steel-concrete transverse joint section with reasonable force is formed, but also the requirement of construction convenience is met at the same time, and a solution that meets both design requirements and construction convenience is provided for the construction of the steel-concrete transverse joint section in the negative bending moment zone, the concrete in the negative bending moment zone is closely combined with the steel structure in the transverse direction, and the problem of concrete being easily tensilely cracked in the steel-concrete composite structure in the negative bending moment zone when the bridge deck width is large is solved.

Description

Technical Field

[0001] The invention relates to the technical field of design and construction of bridge engineering, and in particular to a steel-concrete transverse joint section structure in a negative bending moment zone. Background Art

[0002] In recent years, with the rapid development of my country's economy, people have higher and higher requirements for convenient transportation, and the construction of infrastructure such as highway bridges is developing in full swing. In addition, the concept of lightweight, assembled, green, energy-saving and environmentally friendly bridge construction will be the development trend of future bridge construction. Concrete structure bridges can no longer meet the current economic, environmental and sustainable development needs of the modern civil engineering industry. The combination of concrete structure and steel structure into steel-concrete composite structure is gradually emerging.

[0003] Steel-concrete composite beams connect concrete slabs to steel beams through shear connectors, which can give full play to the compressive properties of concrete and the tensile properties of steel. In addition, steel-concrete composite beams have good construction performance, durability and economy, so they are widely used in bridge construction. With the current rapid economic development, in order to facilitate traffic transportation, the demand for the transverse width of bridges has been continuously increased, resulting in a significant increase in transverse force. The two ends of the transverse bridge are in the negative moment zone. The steel-concrete composite beams in the negative moment zone are in an unfavorable stress state where the steel beam section is compressed and the concrete slab section is tensile. The concrete slab of the steel-concrete composite beam in the negative moment zone is very easy to crack under tension, which leads to a decrease in the stiffness of the composite beam section. Water seeps along the cracks, causing corrosion of steel bars, shear connectors and steel beams, reducing the durability of the structure. Therefore, it is urgent to strictly control the development of cracks, which is a key issue in the design of composite beams in the negative moment zone.

[0004] At present, many scholars at home and abroad have conducted relevant research on the mechanical properties of the negative bending zone of steel-concrete composite beams, and proposed a variety of solutions to the cracking problem, mainly including: ① Increase the reinforcement and increase the reinforcement ratio; ② Apply prestress to precast concrete slabs; ③ Use new shear connectors such as friction-type high-strength bolts or pull-out but not shear-resistant studs; ④ Use new concrete materials with good tensile properties in the negative bending section, such as engineering fiber-reinforced cement-based composite materials, steel fiber concrete and ultra-high performance concrete. All of the above methods can play a certain role in small steel-concrete composite bridges, but for large and medium-sized steel-concrete composite bridges, currently only method 4, which uses new concrete materials with good tensile properties in the negative bending section, is applicable. Although the method New concrete materials with good tensile properties can effectively solve the adverse stress conditions of concrete tension in the negative bending zone. However, there is a problem. The new concrete used in the negative bending section cannot be closely connected with the steel beam below in the transverse direction of the bridge, resulting in an unsatisfactory design of the steel-concrete combined section. There is still no very effective solution. There is little research on the reasonable construction of the transverse combined section of the steel-concrete composite structure in the negative bending zone. There is still a lack of solutions that meet both the design requirements and construction convenience for the transverse combined section of the steel-concrete composite structure in the negative bending zone. Therefore, it is urgent to study the reasonable structure and mechanical properties of the steel-concrete transverse combined section in the negative bending zone, and to develop a new steel-concrete transverse combined section design scheme with reasonable structure and reliability. Summary of the invention

[0005] The purpose of the present invention is to provide a steel-concrete transverse joint section structure in a negative bending moment zone to solve the following technical problems:

[0006] The invention solves the problem that when the transverse width of the steel-concrete composite beam is large, the concrete in the negative bending moment zone of the transverse bridge is easily subjected to tensile cracking, which causes a series of problems and reduces the service life of the bridge.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A steel-concrete transverse joint section structure in a negative bending moment zone includes ultra-high performance concrete UHPC. The ultra-high performance concrete UHPC must have good tensile strength. The good tensile strength is used to combine with the precast concrete bridge deck 500, and the ultra-high performance concrete UHPC, the steel structure and the precast bridge deck are further formed into a tight whole. The joint section end plate, the joint section top plate, the joint section bottom plate, the joint section stiffening longitudinal rib, the joint section stiffening longitudinal rib bottom plate, the joint section top bolts, the joint section bottom bolts, the vertical healthy teeth, and the two ends of the transverse bridge are fixedly connected. A steel bridge deck, wherein the surface of the steel bridge deck is fixedly connected with a steel bridge deck longitudinal rib, wherein the steel-concrete transverse joint section structure is fixedly connected to the concrete bridge deck by ultra-high performance concrete UHPC, and a steel structure is fixedly connected between the ultra-high performance concrete UHPC and the concrete bridge deck, and through a three-sided combination method, a longitudinal slot is formed to form the ultra-high performance concrete UHPC with other parts to form a whole for sufficient stress, and on the other hand, it is convenient for the pouring construction operation of the ultra-high performance concrete UHPC.

[0009] As a further solution of the present invention: the ultra-high performance concrete UHPC is fixedly connected to the end steel bridge deck through the connecting section end plate, and the connecting section end plate is fixedly connected to the connecting section top plate, and the top of the connecting section top plate is fixedly connected with a connecting section top bolt.

[0010] As a further solution of the present invention: the end plate of the longitudinally-lengthened connecting section is fixedly connected to the longitudinally-lengthened steel bridge deck, the crossbeam is fixedly connected to the crossbeam web and the cross-bridge-lengthened reinforcement of the steel bridge deck, and the crossbeam is fixedly connected to the cross-bridge-lengthened reinforcement bottom plate of the steel bridge deck.

[0011] As a further solution of the present invention: the top plate of the longitudinal bridge-long connecting section is fixedly connected to the end plate of the longitudinal bridge-long connecting section, and the top plate of the connecting section protrudes outward, and the protruding part of the top plate of the connecting section is fixedly connected with the top bolt of the connecting section.

[0012] As a further solution of the present invention: the ultra-high performance concrete UHPC in the negative bending moment zone is fixedly connected to the lower steel beam through two beam top plates, and a connecting section bottom plate is fixedly connected between the two beam top plates, a beam longitudinal rib is fixedly connected between the two beam top plates, and a connecting section stiffening longitudinal rib is fixedly connected between the beam longitudinal ribs of the two beams through a splicing plate, a connecting section stiffening longitudinal rib bottom plate is fixedly connected under the connecting section stiffening longitudinal rib, and the connecting section bottom plate and the surface of the lower beam top plate are both fixedly connected with connecting section bottom bolts.

[0013] As a further solution of the present invention: the top bolts of the connecting section on the top plate of the connecting section are the same size as the bottom bolts of the connecting section on the bottom plate of the connecting section and the web of the lower cross beam, and are arranged at the same spacing.

[0014] As a further solution of the present invention: the ultra-high performance concrete UHPC in the negative bending moment zone is fixedly connected to the middle prefabricated concrete bridge deck through vertical healthy teeth.

[0015] Beneficial effects of the present invention:

[0016] Through the combination of the top plate of the joint section, the end plate of the joint section, the bottom plate of the joint section, the stiffened longitudinal rib of the joint section, the bottom plate of the stiffened longitudinal rib of the joint section, the bottom bolts of the joint section, the top bolts of the joint section, and the vertical healthy teeth, not only a steel-concrete transverse joint section with reasonable force is formed, but also the requirements of construction convenience are met at the same time, providing a solution that meets both the design requirements and construction convenience for the construction of the steel-concrete transverse joint section in the negative bending moment zone, which can effectively combine the concrete in the negative bending moment zone with the steel structure laterally, and can effectively solve the problem of concrete being easily tensile cracked in the steel-concrete composite structure in the negative bending moment zone when the bridge deck width is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is an elevation view of the steel-concrete transverse joint section of the present invention;

[0019] Figure 2 It is a schematic diagram of the combination of the UHPC and the end steel bridge deck of the present invention;

[0020] Figure 3 It is the top plate diagram of the combined section of the present invention;

[0021] Figure 4 It is a schematic diagram of the combination of the UHPC of the present invention and the steel beam below;

[0022] Figure 5 It is a structural diagram of the top and bottom bolts of the combination section of the present invention;

[0023] Figure 6 This is a key diagram of the wet joint between the UHPC and precast concrete bridge deck of the present invention.

[0024] In the figure: 100, ultra-high performance concrete UHPC; 200, end plate of joint section; 201, top plate of joint section; 202, bottom plate of joint section; 203, stiffening longitudinal rib of joint section; 204, bottom plate of stiffening longitudinal rib of joint section; 205, splicing plate; 300, steel structure; 301, steel bridge deck; 302, longitudinal rib of steel bridge deck; 303, transverse stiffening of steel bridge deck; 304, transverse stiffening bottom plate of steel bridge deck; 400, steel cross beam; 401, web of cross beam; 402, top plate of cross beam; 403, longitudinal rib of cross beam; 500, concrete bridge deck; 600, top bolts of joint section; 601, bottom bolts of joint section; 800, lower chord. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 6As shown, the present invention is a steel-concrete transverse joint section structure in a negative bending moment zone, including ultra-high performance concrete UHPC100, the ultra-high performance concrete UHPC100 in the negative bending moment zone is fixedly connected to the middle prefabricated concrete bridge deck 500 through vertical healthy teeth, the ultra-high performance concrete UHPC100 in the negative bending moment zone is fixedly connected to the lower steel cross beam 400 through two cross beam top plates 402, and a joint section bottom plate 202 is fixedly connected between the two cross beam top plates 402, a cross beam longitudinal rib 403 is fixedly connected between the two cross beam top plates 402, and a joint section stiffening longitudinal rib 203 is fixedly connected between the cross beam longitudinal ribs 403 of the two cross beams through a splicing plate 205, and a joint section stiffening longitudinal rib bottom plate is fixedly connected under the joint section stiffening longitudinal rib 203 204, the surface of the bottom plate 202 of the joint section and the top plate 402 of the lower cross beam are fixedly connected with the bottom bolt 601 of the joint section, the ultra-high performance concrete UHPC100 is fixedly connected to the end steel bridge deck through the joint end plate 200, and the joint end plate 200 is fixedly connected to the joint top plate 201, and the top of the joint top plate 201 is fixedly connected with the joint top bolt 600, the joint top bolt 600 on the joint top plate 201 is the same size as the joint bottom plate 202 and the joint bottom bolt 601 on the web plate 401 of the lower cross beam, and the arrangement spacing is the same, the joint end plate 200 of the longitudinal bridge is fixedly connected to the steel bridge deck 301 of the longitudinal bridge, and the joint top plate 201 of the longitudinal bridge is fixedly connected to the joint of the longitudinal bridge. The end plate 200 of the segment is fixedly connected, and the top plate 201 of the combined segment protrudes outward, the protruding part is fixedly connected with the top bolt 600 of the combined segment, the cross beam is fixedly connected with the cross beam web 401 and the transverse bridge reinforcement 303 of the steel bridge deck, and the cross beam is fixedly connected with the transverse bridge reinforcement bottom plate 304 of the steel bridge deck. The ultra-high performance concrete UHPC100 must have good tensile strength, and the good tensile strength is used to combine with the precast concrete bridge deck 500, and further form the ultra-high performance concrete UHPC100 with the steel structure 300 and the precast bridge deck into a tight whole, the end plate 200 of the combined segment, the top plate 201 of the combined segment, the bottom plate 202 of the combined segment, the stiffening longitudinal rib 203 of the combined segment, the stiffening longitudinal rib bottom plate 204 of the combined segment, and the top bolt The steel-concrete transverse joint section structure is fixedly connected to the concrete bridge deck 500 by ultra-high performance concrete UHPC100, and the steel structure 300 is fixedly connected between the ultra-high performance concrete UHPC100 and the concrete bridge deck 500. The steel structure 300 is fixedly connected between the ultra-high performance concrete UHPC100 and the concrete bridge deck 500, and the three-sided combination method makes it a longitudinal groove that is full of the longitudinal bridge direction. On the one hand, the ultra-high performance concrete UHPC100 can form a whole with other parts to fully bear the force, and on the other hand, it is convenient to carry out the pouring construction operation of the ultra-high performance concrete UHPC100.The top plate 201 of the joint section, the end plate 200 of the joint section, the bottom plate 202 of the joint section, the stiffening longitudinal rib 203 of the joint section, the bottom plate 204 of the stiffening longitudinal rib of the joint section, the bottom stud 601 of the joint section, the top stud 600 of the joint section, and the vertical healthy teeth 700 not only form a steel-concrete transverse joint section with reasonable force, but also meet the requirements of construction convenience. The structure of the steel-concrete transverse joint section in the negative bending moment zone provides a solution that meets both design requirements and construction convenience.

[0027] Working principle of the present invention:

[0028] Step 1: First, a steel structure 300 is formed by a steel crossbeam 400, a steel bridge deck 301 and a steel bridge deck longitudinal rib 302, and a lower chord 800 is combined with the lower steel structure 300 and the densely distributed steel crossbeams 400. Ultra-high performance concrete UHPC100 is used in the negative bending moment area to enhance the tensile performance. The ultra-high performance concrete UHPC100 is combined with the steel structure 300 formed at the end, the lower steel crossbeam 400, and the precast concrete bridge deck 500 in the middle, so that the ultra-high performance concrete UHPC100 can form a whole with other parts to fully bear the force, and can form a three-door surrounded notch, so that the ultra-high performance concrete UHPC100 can form a whole with other parts to fully bear the force, and it is conducive to the pouring of the ultra-high performance concrete UHPC100.

[0029] Step 2: The combination of the ultra-high performance concrete UHPC100 and the end steel structure 300 in the negative moment zone is to weld the longitudinal bridge-length connecting section end plate 200 from the side and the longitudinal bridge-length connecting section top plate 201 from the top. The longitudinal bridge-length connecting section end plate 200 is welded to the longitudinal bridge-length steel bridge deck 301, and is welded to the crossbeam web 401, the steel bridge deck transverse bridge reinforcement 303 and the steel bridge deck transverse bridge reinforcement bottom plate 304 at the crossbeam, and the longitudinal bridge-length connecting section top plate 201 is welded to the longitudinal bridge-length connecting section end plate 200.

[0030] Step 3: For the convenience of ultra-high performance concrete UHPC100 construction, the top plate 201 of the longitudinal bridge section is designed to protrude a certain distance, such as Figure 3 shown.

[0031] Step 4: The combination of the ultra-high performance concrete UHPC100 in the negative bending moment zone and the steel beam 400 below is to weld a joint section bottom plate 202 between the two beam top plates 402, and use a splicing plate 205 to splice the joint section stiffening longitudinal ribs 203 between the beam longitudinal ribs 403 of the two beams, and weld the joint section stiffening longitudinal rib bottom plate 204 under the joint section stiffening longitudinal ribs 203.

[0032] Step 5: The top bolts 600 of the connecting section are only arranged on the protruding part of the top plate 201 of the connecting section, and the bottom bolts 601 of the connecting section are arranged on the bottom plate 202 of the connecting section and the top plate 402 of the lower beam. The top bolts 600 of the connecting section are the same size as the bottom bolts 601 of the connecting section and are arranged at the same spacing.

[0033] Step six: The ultra-high performance concrete UHPC 100 in the negative bending moment area and the prefabricated concrete bridge deck 500 in the middle are combined in the form of a wet joint with vertical healthy teeth 700.

[0034] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A steel-concrete transverse joint structure in a negative moment zone, comprising ultra-high performance concrete (UHPC), a joint end plate, a joint top plate, a joint bottom plate, a joint stiffening longitudinal rib, a joint stiffening longitudinal rib bottom plate, a joint top stud, a joint bottom stud, and a vertical healthy tooth, characterized in that: The two ends of the transverse bridge are fixedly connected with steel bridge decks, the surface of the steel bridge deck is fixedly connected with steel bridge deck longitudinal ribs, and the steel-concrete transverse joint section structure is fixedly connected with the concrete bridge deck through ultra-high performance concrete UHPC; The ultra-high performance concrete (UHPC) is fixedly connected to the end steel bridge deck through the end plate of the connecting section, and the end plate of the connecting section is fixedly connected to the top plate of the connecting section, and the top of the top plate of the connecting section is fixedly connected with a top bolt of the connecting section; The end plate of the connecting section which is the entire length of the longitudinal bridge is fixedly connected to the steel bridge deck which is the entire length of the longitudinal bridge, and the cross beam is fixedly connected to the cross beam web plate and the cross beam reinforcement of the steel bridge deck, and the cross beam is fixedly connected to the cross beam reinforcement bottom plate of the steel bridge deck; The top plate of the longitudinally extending connecting section is fixedly connected to the end plate of the longitudinally extending connecting section, and the top plate of the connecting section is protruded outwardly, and the protruding part of the top plate of the connecting section is fixedly connected to the connecting section plate bolt; The ultra-high performance concrete UHPC in the negative bending moment zone is fixedly connected to the steel cross beam below through two cross beam top plates, and a joint section bottom plate is fixedly connected between the two cross beam top plates, a cross beam longitudinal rib is fixedly connected between the two cross beam top plates, and a joint section stiffening longitudinal rib is fixedly connected between the cross beam longitudinal ribs of the two cross beams through a splicing plate, a joint section stiffening longitudinal rib bottom plate is fixedly connected under the joint section stiffening longitudinal rib, and the joint section bottom plate and the surface of the cross beam top plate below are both fixedly connected with joint section bottom bolts; the ultra-high performance concrete UHPC in the negative bending moment zone is fixedly connected to the middle prefabricated concrete bridge deck through vertical healthy teeth.

2. The steel-concrete transverse joint section structure at the negative moment zone according to claim 1 is characterized in that: The top bolts of the joint segment on the top plate of the joint segment are the same size as the bottom bolts of the joint segment on the bottom plate of the joint segment and the web of the lower cross beam, and are arranged at the same spacing.

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