A triangular steel cross diaphragm for a beam bridge and its high-precision construction method

Abstract

A triangular steel cross diaphragm for a beam bridge and its high-precision construction method belong to the technical field of bridge steel cross diaphragms. It includes a top node widened steel plate connected to the post-cast concrete between adjacent beam flanges and lower node steel plates arranged on the two side beam webs; the lower node steel plates on both sides are connected to the top node widened steel plate through steel pipes; both lower node steel plates on both sides are connected to bolt sleeves embedded at the bottom of the concrete of the corresponding beam web through high-strength bolts to form a transverse force transmission structure. In the present invention, the top node widened steel plate and the lower node steel plates on both sides are connected by three steel pipes to form a triangular support structure, which has a light self-weight, high structural strength and simple construction; different connection methods are respectively adopted between the lower node steel plates on both sides and the steel pipes, which can adjust the installation error, facilitate the control of assembly error and improve the construction precision.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge steel diaphragm beams, and in particular relates to a triangular steel diaphragm beam of a beam bridge and a high-precision construction method thereof. Background Art

[0002] The diaphragm plays a role in ensuring that the main beams are connected to each other as a whole in the assembled T-beam bridge. It is a common lateral connection in beam bridges that strengthens the lateral stiffness and lateral stability between beams, improves the overall performance of each beam and the lateral transfer of load. The greater its stiffness, the better the integrity of the bridge, and the main beams can work better together under the load.

[0003] In recent years, the rapid development of the transportation industry has led to the construction of a large number of large-scale bridge projects. At the same time, the problem of bridge defects has become increasingly prominent. As for diaphragms, there are many problems with concrete diaphragms during use, such as: the existence of oblique cracks at the connection between the concrete diaphragm and the wet cast joint, the existence of defects, exposed reinforcement, alkali efflorescence in the concrete end diaphragm, and the existence of misalignment of the diaphragm due to construction errors.

[0004] Compared with traditional diaphragms, steel diaphragms are a structure with better integrity and more convenient construction. The components are made of high-strength and durable steel, and are combined with anti-corrosion processes such as paint to make the components have strong bearing capacity and durability. The main components of the steel diaphragm are produced and welded in the factory, so the quality of the components can be guaranteed and the construction error can be controlled; make full use of industrialized and standardized batch production prefabrication, and standardize the production of steel diaphragms according to parameters such as the beam height and wet joint width of the T beam, so that the total construction period of design and construction is shorter. Summary of the invention

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a triangular steel diaphragm of a beam bridge and a high-precision construction method thereof, which can improve the problems of easy cracking and difficult alignment existing in traditional concrete diaphragm beams, and has good overall structural stability and good structural stress-bearing performance.

[0006] The present invention provides the following technical solutions:

[0007] A triangular steel diaphragm of a beam bridge is installed between adjacent T-beams; it includes a top node widening steel plate connected to the post-cast concrete between adjacent beam flanges and a lower node steel plate arranged on the beam webs on both sides; the lower node steel plates on both sides are connected to the top node widening steel plate through steel pipes; the lower node steel plates on both sides are connected to the bolt sleeves pre-buried in the bottom of the corresponding beam web concrete through high-strength bolts to form a lateral force transmission structure.

[0008] Furthermore, the lower node steel plate on one side is connected to the steel pipe through a cross node plate.

[0009] Furthermore, a foot support is provided on the lower node steel plate on the other side, and a connecting plate is provided on the corresponding steel pipe. The connecting plate and the foot support are connected by high-strength bolts.

[0010] Furthermore, a group of shear studs are provided on the widened steel plate of the top node. The widened steel plate of the top node is cast in the concrete of the post-cast strip between adjacent beam flanges through the shear studs. The width of the widened steel plate of the top node is 4-6 cm larger than the width of the post-cast strip between adjacent beam flanges; bolt hole processing positions are reserved on the left lower node steel plate.

[0011] Furthermore, the bolt sleeve is limited by a rectangular steel frame, and the rectangular steel frame is formed by splicing two limited steel brackets with holes; the rectangular steel frame, the bolt sleeve and the high-strength bolts are all pre-embedded in the main beam.

[0012] A high-precision construction method for a triangular steel cross beam of a beam bridge includes the following steps:

[0013] S1. Produce the main components and accessories of the triangular steel cross beam, including the following steps:

[0014] 1.1) Reserve bolt hole processing positions at node J on the left lower node steel plate A , node J on the connecting plate C and node J on the foot support D . Process bolt holes at node J on the right lower node steel plate B ;

[0015] 1.2) Weld and fix the left lower node steel plate and the foot support to form a fitting, and process other components separately to form the main components of the triangular steel cross beam;

[0016] 1.3) During the production and processing of the components, ensure that the actual areas of the lower node steel plates on both sides are larger than the theoretical design areas to reserve adjustment space for balancing the construction errors generated during the prefabrication of the concrete main beam and the pre-embedding of the bolt sleeves. Other components are prefabricated according to the drawing 1:1;

[0017] S2. Prefabricate the concrete main beam:

[0018] Determine the pre-embedding position of the bolt sleeve, weld and fix the rectangular steel frame, horizontally insert the bolt sleeve into the rectangular steel frame, tie and fix the bolt sleeve with the surrounding steel bars, and hoist the bolt sleeve and the steel reinforcement cage into the main beam formwork together;

[0019] S3. Construct the concrete main beam: Determine the construction error between the dimensions of the on-site concrete main beams and the theoretical design dimensions, and adjust the fixed positions of the lower node steel plates;

[0020] S4. Hoist and construct the concrete main beam. After the hoisting construction is completed, record the ambient temperature as the measured temperature, and measure the joint J A 、J C and J D The actual spatial positions of the reserved bolt hole positions at and the bolt hole positions of the completed drilled joint J B at are matched with the embedded bolt spatial positions at the main beam web and numbered;

[0021] S5. According to the actual spatial positions and numbers of the bolt hole positions determined in S4, drill bolt holes at the joint J A at, and use high-strength bolts to connect and fix the main beam with the matching position of the drilled fitting and the embedded sleeve on one side; Secondly, match and number the main components of the triangular steel cross diaphragm beam with drilled bolt holes at the joint J B at with the position of the embedded sleeve on the other side; Finally, according to the construction error, after hoisting the components, determine the number of holes required for connection between the joint J C at and the joint J D at, and drill and number the bolt holes at the connecting plate and the foot support respectively according to the actual quantity and position;

[0022] S6. Install the steel cross diaphragm beam in stages.

[0023] Furthermore, the specific process of the step S6 is as follows:

[0024] Select the steel cross diaphragm beam components that match the bolt sleeve position and the foot support node, fix the right lower node steel plate with pre-set bolt holes at the determined position, and use high-strength bolts to connect the right lower node steel plate with the main beam through the bolt sleeve embedded at the bottom of the adjacent beam web concrete; Then connect the connecting plate with the fixed foot support, and finally complete the assembly construction of the overall triangular steel cross diaphragm beam.

[0025] Furthermore, the ratio of the actual area to the theoretical design area of the precast lower node steel plates on both sides is 1.05 - 1.15.

[0026] Furthermore, in the step S6, when installing the steel cross diaphragm beam, control the temperature difference between the ambient temperature during the installation of the steel cross diaphragm beam and the measured ambient temperature to balance the construction error caused by the deviation between the actual installation temperature and the measured temperatures at the joints J A 、J B 、J C and J D at, and improve the construction accuracy.

[0027] By adopting the above technologies, compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1) In the present invention, the widened steel plate at the top node and the lower node steel plates on both sides are connected by three steel pipes to form a triangular support structure, which has a light self-weight, high structural strength, and is easy to construct.

[0029] 2) In the present invention, different connection methods are respectively adopted between the lower node steel plates on both sides and the steel pipes, which can adjust the installation error, facilitate the control of assembly error, and improve the construction accuracy.

[0030] 3) In the present invention, based on the connection structure in which the lower node steel plate is connected to the embedded bolt sleeve by high-strength bolts, widening the top steel plate and adding a cross node plate can effectively reduce the influence on the mechanical properties of the beam.

[0031] 4) In the present invention, the lower node steel plate is accurately connected to the embedded bolt sleeve by high-strength bolts, which can realize the prefabrication processing of the lower node steel plate in the factory, greatly reduce the construction difficulty and construction error, and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic installation structure diagram of the main components of the triangular steel cross beam of the present invention;

[0033] Figure 2 is a schematic installation structure diagram of the accessories of the present invention;

[0034] Figure 3 is a schematic structure diagram of the triangular steel cross beam of the present invention installed on the T-beam;

[0035] Figure 4 is a schematic structure diagram of the left node of the triangular steel cross beam of the present invention;

[0036] Figure 5 is a schematic structure diagram of the right node of the triangular steel cross beam of the present invention;

[0037] Figure 6 is a schematic structure diagram of the bolt sleeve of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention clearer; the following further describes the present invention in detail in conjunction with the drawings in the specification and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] On the contrary, the present invention covers any alternatives, modifications, equivalent methods, and solutions defined by the claims that are within the essence and scope of the present invention. Further, in order to enable the public to better understand the present invention, in the following detailed description of the present invention, some specific details are described in detail. Those skilled in the art can fully understand the present invention without the description of these details.

[0040] Please refer to Figure 1-6 , a triangular steel crossbeam for a beam bridge, which is installed between adjacent T-beams, or can also be installed between the webs of two adjacent small box girders or short T-beams; it includes a top node widening steel plate 4 and lower node steel plates 3 on both sides. The node widening steel plate 4 and the lower node steel plates 3 on both sides are connected by steel pipes 5 to form an integral body.

[0041] Specifically, a cross node plate 31 is vertically provided on the right lower node steel plate 3, and the right steel pipe 5 is welded to the cross node plate 31 through a weld seam 51; this side serves as the fixed connection side of the triangular steel crossbeam.

[0042] Specifically, a foot support 37 is welded on the left lower node steel plate 3, a connecting plate 36 is welded to the weld seam 51 of the left steel pipe 5, and the connecting plate 36 and the foot support 37 are connected by bolts; this side serves as the error adjustment connection side of the triangular steel crossbeam.

[0043] Specifically, a set of shear studs 42 and a top cross node plate 41 are provided on the top node widening steel plate 4, and they are poured into the concrete of the post-cast strip between the adjacent beam flanges 2 through the shear studs 42; one ends of the left and right steel pipes 5 are respectively connected to the top cross node plate 41; the width of the top node widening steel plate is 5 cm larger than the width of the post-cast strip between the adjacent beam flanges to improve the punching shear resistance of the top node widening steel plate 4.

[0044] Specifically, the lower node steel plates 3 on both the left and right sides are connected to the main beam through high-strength bolts 32 and bolt sleeves 33; the bolt sleeve 33 is limited by a rectangular steel frame, and the rectangular steel frame is formed by splicing two limited steel brackets 34 with holes; the rectangular steel frame, high-strength bolts 32, and bolt sleeves 33 are all embedded in the main beam.

[0045] Specifically, bolt holes for connection are reserved on the lower node steel plate 3.

[0046] A high-precision construction method for a triangular steel crossbeam of a beam bridge includes the following steps:

[0047] S1. Produce the main components and fittings of the triangular steel cross beam: During the production process, all components of the triangular steel cross beam are divided into the main components and fittings of the triangular steel cross beam. The main components include the connecting plate 36, the right lower node steel plate 3, the cross node plate 31, the top node widened steel plate 4 with shear studs 42, the top cross node plate 41, and three steel pipes 5; the fittings are composed of the left lower node steel plate 3 and the foot support 37 welded and fixed together.

[0048] The steps include:

[0049] 1.1. Reserve the processing positions of bolt holes at node J on the left lower node steel plate 3 A , node J on the right lower node steel plate 3 B , node J on the connecting plate 36 C and node J on the foot support 37 D ; ensure that the ratio of the actual lateral length of the main components of the triangular steel cross beam to the theoretical design length is 1.05 - 1.15 to reserve an adjustment space;

[0050] S2. Prefabricate the concrete main beam:

[0051] Precisely embed the bolt sleeve 33 and the cuboid steel frame together in the main beam concrete. The steel frame is spot-welded and fixed in the steel reinforcement cage. The bolt sleeve 33 and the high-strength bolt 32 are horizontally inserted into the limit steel bracket 34 and tied and fixed with steel wire; the length of the pre-embedded bolt sleeve 33 is slightly greater than the length of the high-strength bolt 32, and the voids of the structure are filled with plastic foam to prevent concrete from flowing in and facilitate the removal of the high-strength bolt 32 during construction.

[0052] S3. Construct the concrete main beam: After the main beam formwork is removed, use tools such as a reamer to remove the high-strength bolt 32, determine the construction error between the on-site size of the concrete main beam and the theoretical design size, and adjust the fixed positions of the lower node steel plates 3 at various places of the steel cross beam;

[0053] S4. Carry out the hoisting construction of the concrete main beam. After the hoisting construction is completed, record the ambient temperature as the measurement temperature, and use a total station or other measuring instruments to accurately measure the actual spatial positions of the bolt holes at nodes J A , J B , J C and J D in advance and number them;

[0054] S5. According to the actual spatial positions and numbers of the bolt holes determined in S4, accurately drill bolt holes at node J A , and use high-strength bolts 32 to connect and fix the fittings after drilling with the main beam where the position of the embedded sleeve on one side matches; secondly, for node J BMatch and number the main components of the triangular steel cross diaphragm beam with bolt holes drilled at the location; finally, according to the construction error, after hoisting the components, determine the number of holes required for connection at node J C at the location and node J D at the location, and drill and number the bolt holes at the connecting plate 36 and the foot support 37 respectively according to the actual quantity and position;

[0055] S6. Install the steel cross diaphragm beam in stages: Select the steel cross diaphragm beam components that are precisely matched with the position of the bolt sleeve 33 and the nodes of the foot support 37. Fix the lower right node steel plate 3 with bolt holes set at the determined position, and use high-strength bolts 32 to connect the lower right node steel plate 3 to the main beam through the bolt sleeve 33 embedded at the bottom of the adjacent beam web concrete; then connect the connecting plate 36 to the fixed foot support 37, and finally complete the assembly construction of the overall triangular steel cross diaphragm beam.

[0056] Among them, when installing the steel cross diaphragm beam, control the temperature difference between the installation environment temperature of the steel cross diaphragm beam and the measurement environment temperature within ±5°C. Comprehensively consider the influence of the environment on the installation of the steel cross diaphragm beam, meet the steel structure design specifications, and balance the actual installation temperature and the construction error caused by the deviation between the measured temperatures at nodes J A 、J B 、J C and J D at the location, so as to improve the construction accuracy.

[0057] For the convenience of on-site installation and to minimize the on-site high-altitude welding operations, the places where the main components and accessories of the steel cross diaphragm beam need to be welded can be welded and fixed in the factory in advance, that is, in the components: the top node widened steel plate 4 is welded to the cross node plate 41, the three steel pipes 5 are welded to the connecting plate 36 and the cross node plate 31 through the welds 51 at both ends, and the lower right node steel plate 3 is welded to the cross node plate 31; in the accessories: the single-piece lower node steel plate 3 is welded and fixed to the foot support 37; the two parts are installed in stages during construction, and finally form a triangular steel cross diaphragm beam structure.

[0058] The above are only the preferred embodiments of the present invention; they are not intended to limit the present invention; any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-precision construction method for the triangular steel cross beam of a beam bridge. The triangular steel cross beam of the beam bridge is installed between adjacent T-beams. It is characterized in that: The triangular steel cross diaphragm of the beam bridge includes a top node widened steel plate connected to the post-cast concrete between adjacent beam flanges and lower node steel plates arranged on the two side beam webs; the lower node steel plates on both sides are connected to the top node widened steel plate through steel pipes; both lower node steel plates on both sides are connected to bolt sleeves embedded at the bottom of the corresponding beam web concrete through high-strength bolts to form a transverse force transmission structure; A foot support is provided on the left lower node steel plate, and a connecting plate is provided on the corresponding steel pipe, and the connecting plate is connected to the foot support through high-strength bolts; The right lower node steel plate is connected to the steel pipe through a cross node plate; a group of shear studs are provided on the top node widened steel plate, and the top node widened steel plate is cast in the concrete of the post-cast belt between adjacent beam flanges through shear studs. The width of the top node widened steel plate is 4-6 cm larger than the width of the post-cast belt between adjacent beam flanges; a bolt hole processing position is reserved on the left lower node steel plate; the bolt sleeve is limited by a rectangular steel frame, and the rectangular steel frame is formed by splicing two limited steel brackets with holes; the rectangular steel frame, bolt sleeve and high-strength bolts are all embedded in the main beam; A high-precision construction method for the triangular steel cross diaphragm of a beam bridge includes the following steps: S1. Produce the main components and accessories of the triangular steel cross diaphragm, including the following steps: 1.1) Nodes on the left lower node steel plate J A , nodes on the connecting plate J C and nodes on the foot support J D Reserve the processing positions of bolt holes. Machine bolt holes at the nodes J B on the right lower node steel plate; 1.2) Weld and fix the left lower node steel plate and the foot support to form a fitting, and process other components separately to form the main components of the triangular steel cross diaphragm; 1.3) During the production and processing of the components, ensure that the actual area of the lower node steel plates on both sides is larger than the theoretical design area, so as to reserve an adjustment space for balancing the construction errors generated during the precast of the concrete main beam and the embedding of the bolt sleeves. Other components are precast according to the drawing 1:1; S2. Precast the concrete main beam: Determine the embedding position of the bolt sleeve, weld and fix the rectangular steel frame, horizontally insert the bolt sleeve into the rectangular steel frame, tie and fix the bolt sleeve with the surrounding steel bars, and hoist the steel bar cage into the main beam formwork together; S3. Construct the concrete main beam: Determine the construction error between the on-site size of the concrete main beam and the theoretical design size, and adjust the fixed position of the lower node steel plate; S4. Hoist and construct the concrete main beam. After the hoisting construction is completed, record the ambient temperature as the measured temperature, and measure the actual spatial positions of the reserved bolt hole positions at the joints J A 、J C and J D the actual spatial positions of the reserved bolt hole positions at J B the joints where the matching drilling is completed, and the spatial positions of the bolt holes at the joints and the embedded bolts at the main beam web are numbered; S5. According to the actual spatial positions and numbers of the bolt holes determined in S4, drill bolt holes at the joint J A and use high-strength bolts to connect and fix the main beam whose fittings after drilling match the position of the embedded sleeve on one side; Secondly, match and number the main components of the triangular steel cross diaphragm beam with bolt holes drilled at the joint J B with the position of the embedded sleeve on the other side; Finally, according to the construction error, after hoisting the components, determine the number of holes required for connection at the joint J C and the joint J D Drill bolt holes and number them at the connecting plate and the foot support respectively according to the actual quantity and position; S6. Install the steel cross diaphragm in stages.

2. The high-precision construction method of a triangular steel cross beam of a beam bridge according to claim 1, characterized in that The specific process of the step S6 is as follows: Select a steel cross diaphragm component that matches the position of the bolt sleeve and the foot support node, fix the right lower node steel plate with pre-set bolt holes at the determined position, and connect the right lower node steel plate to the main beam through the bolt sleeve embedded at the bottom of the adjacent beam web concrete by using high-strength bolts; then connect the connecting plate to the fixed foot support, and finally complete the assembly construction of the overall triangular steel cross diaphragm.

3. The high-precision construction method of a triangular steel cross beam of a beam bridge according to claim 1, characterized in that The ratio of the actual area to the theoretical design area of the precast lower node steel plates on both sides is 1.05-1.

15.

4. The high-precision construction method of a triangular steel cross beam of a beam bridge according to claim 1, characterized in that In step S6, when installing the steel cross girder, control the temperature difference between the environment temperature during the installation of the steel cross girder and the measured environment temperature, so as to balance the construction error caused by the deviation between the actual installation temperature and the measured temperature at the node J A 、J B 、J C and J D improve the construction accuracy

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