Aluminum alloy bridge span top block for horizontal pushing type mechanical bridge

Abstract

The invention belongs to the technical field of mechanized bridges, and particularly relates to a top block of an aluminum alloy bridge span. An aluminum alloy bridge span top block for a horizontal pushing type mechanical bridge comprises a convex top block and a concave top block. The convex top block comprises a transition plate A and a convex bearing block; the transition plate A and the bridge span body are in interference fit and are connected through a welding seam; the convex bearing block and the cab apron A are in interference fit and are connected through a screw; the concave top block comprises a transition plate B and a concave bearing block; the transition plate B is in interference fit with the bridge span body and is connected with the bridge span body through a welding seam; the concave bearing block is in interference fit with the transition plate B and is connected with the transition plate B through screws; the convex bearing block and the concave bearing block on the opposite surfaces of the convex top block and the concave top block are mutually extruded and are meshed together through convex and concave parts on the convex bearing block and the concave bearing block. Local extrusion deformation of the top block caused by overlarge local pressure of the aluminum alloy top block, breakage of a convex-concave contact part of the top block for transmitting shearing force due to bearing of huge shearing force, and cracking of a welding seam of a connecting part of the top block and a bridge span structure are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanized bridges, and in particular relates to a top block of an aluminum alloy bridge span. Background Art

[0002] In order to reduce weight, aluminum alloys have begun to be used in the spans of mechanized bridges. The longest existing aluminum alloy span is 23 meters long and bears 25 tons. The top block between two bridge sections is made of the same aluminum alloy as the span. At present, the maximum extrusion force of the top block of the aluminum alloy span is 70 tons and the maximum shear force is 7 tons.

[0003] As the length of the bridge span increases to 26 meters, the load increases to 63.5 tons. The maximum extrusion pressure that the top block needs to withstand reaches 220 tons, and the maximum shear force is 21 tons. The size of the existing aluminum alloy top block is limited by the structure and can no longer transmit the huge pressure and shear force between the bridge sections. During use, the aluminum alloy top block often suffers from local extrusion deformation due to excessive local pressure, the convex and concave contact parts of the top block that transmit the shear force break due to the huge shear force, and the welds at the connection between the top block and the bridge span structure crack. Summary of the invention

[0004] The purpose of the present invention is to provide an aluminum alloy bridge span top block for a push-type mechanized bridge in order to avoid local extrusion deformation of the aluminum alloy top block due to excessive local pressure during use, breakage of the convex and concave contact parts of the top block that transmit shear force due to huge shear force, and cracking of the welds at the connection between the top block and the bridge span structure.

[0005] The technical solution of the present invention is: an aluminum alloy bridge span top block for a push-type mechanized bridge, which comprises: a convex top block and a concave top block.

[0006] The convex top block includes: a transition plate A and a convex bearing block; the transition plate A is interference fit with the bridge span body and connected through a weld, and the convex bearing block is interference fit with the transition plate A and connected through screws.

[0007] The concave top block includes: a transition plate B and a concave bearing block; the transition plate B is interference-fitted with the bridge span body and connected through a weld, and the concave bearing block is interference-fitted with the transition plate B and connected through screws.

[0008] The convex bearing blocks and the concave bearing blocks on the opposite sides of the convex top block and the concave top block are pressed against each other and meshed together through the convex and concave parts on the convex bearing blocks and the concave bearing blocks.

[0009] On the basis of the above solution, in order to ensure the smooth engagement of the convex top block and the concave top block during use, the protruding portion of the convex bearing block is an arc transition.

[0010] In the above solution, specifically, the convex bearing block is interference-fitted with the hole of the transition plate A through a pin, and then connected to the transition plate A through a screw.

[0011] In the above solution, specifically, the concave bearing block is interference-fitted with the hole of the transition plate B through a pin, and then connected to the transition plate B through a screw.

[0012] In the above solution, specifically, the transition plates A and B are made of aluminum alloy, and the convex bearing blocks and the concave bearing blocks are made of high-strength steel.

[0013] How it works:

[0014] During the use of a push-type bridge span, the top blocks between the two bridge sections of the bridge span contact each other, transmitting pressure and shear force. There is a convex top block on one bridge section, and a concave top block on the other bridge section. The convex and concave parts of the two top blocks mesh with each other. A high-strength steel bearing block is embedded on the outside of the top block. The bearing block is interference fit with the hole of the aluminum alloy transition plate of the top block through a pin, and then connected to the aluminum alloy transition plate through screws. Since there is a certain angle between the two bridge sections during the erection process, the top blocks are in line contact during the contact process, and the contact stress between the top blocks is very large, so the high-strength steel bearing block can withstand huge local contact stress. During use, the shear force of one bridge section is transmitted to another bridge section through the top block. The shear force on the top block is first transmitted from the bearing block of one top block to the bearing block of another top block. The pin-type structure of the bearing block itself transmits the shear force to the aluminum alloy transition plate. The aluminum alloy transition plate transmits the shear force to another bridge section structure through the interference fit and weld connection with the bridge section structure. This structure of the aluminum alloy transition plate enables the transition plate body and the weld to bear the shear force together, avoiding cracking due to excessive shear stress in the weld.

[0015] Beneficial effects:

[0016] (1) In the present invention, the bearing block is interference fit with the transition plate and then connected to the transition plate by screws; the transition plate is connected to the bridge section structure by interference fit and weld, thereby transmitting the shear force to another bridge section structure. This structure of the transition plate enables the transition plate body and the weld to bear the shear force together, thereby avoiding cracking of the weld due to excessive shear stress.

[0017] (2) The protruding portion of the convex top block in the present invention is an arc transition, which ensures smooth engagement of the top block during use.

[0018] (3) Since there is a certain angle between the two bridge sections during the erection process, the top blocks are in line contact during the contact process, and the contact stress between the top blocks is very large. The bearing blocks made of high-strength steel in the present invention can withstand huge local contact stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the convex top block of the present invention;

[0021] Figure 3 for Figure 2 AA section view;

[0022] Figure 4 It is a structural schematic diagram of the concave top block in the present invention;

[0023] Figure 5 for Figure 4 AA section view;

[0024] In the figure: 1-convex top block, 1.1-transition plate A, 1.2-convex bearing block, 2-concave top block, 2.1-transition plate B, 2.2-concave bearing block. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] See attached Figure 1 , an aluminum alloy bridge span top block for a push-type mechanized bridge, comprising: a convex top block 1 and a concave top block 2.

[0027] See attached Figure 2 , 3 The convex top block 1 includes: a transition plate A1.1 and a convex bearing block 1.2; the transition plate A1.1 is made of aluminum alloy, and the convex bearing block 1.2 is made of high-strength steel. The transition plate A1.1 is interference-fitted with the bridge span body and connected by a weld, and the convex bearing block 1.2 is interference-fitted with the hole of the transition plate A1.1 through a pin, and then connected to the transition plate A1.1 by screws.

[0028] See attached Figure 4 , 5 The concave top block 2 includes: a transition plate B2.1 and a concave bearing block 2.2; the transition plate B2.1 is made of aluminum alloy, and the concave bearing block 2.2 is made of high-strength steel. The transition plate B2.1 is interference-fitted with the bridge span body and connected by a weld, and the concave bearing block 2.2 is interference-fitted with the hole of the transition plate B2.1 through a pin, and then connected to the transition plate B2.1 by a screw.

[0029] The convex bearing block 1.2 and the concave bearing block 2.2 on the opposite sides of the convex top block 1 and the concave top block 2 are pressed against each other and meshed together through the convex and concave parts on the convex bearing block 1.2 and the concave bearing block 2. In order to ensure the smooth meshing of the convex top block 1 and the concave top block 2 during use, the protruding part of the convex bearing block 1.2 is a circular arc transition.

[0030] During the use of a push-type bridge span, the top blocks between the two bridge sections of the bridge span contact each other, transmitting pressure and shear force. There is a convex top block on one bridge section, and a concave top block on the other bridge section. The convex and concave parts of the two top blocks mesh with each other. A high-strength steel bearing block is embedded on the outside of the top block. The bearing block is interference fit with the hole of the aluminum alloy transition plate of the top block through a pin, and then connected to the aluminum alloy transition plate through screws. Since there is a certain angle between the two bridge sections during the erection process, the top blocks are in line contact during the contact process, and the contact stress between the top blocks is very large, so the high-strength steel bearing block can withstand huge local contact stress. During use, the shear force of one bridge section is transmitted to another bridge section through the top block. The shear force on the top block is first transmitted from the bearing block of one top block to the bearing block of another top block. The pin-type structure of the bearing block itself transmits the shear force to the aluminum alloy transition plate. The aluminum alloy transition plate transmits the shear force to another bridge section structure through the interference fit and weld connection with the bridge section structure. This structure of the aluminum alloy transition plate enables the transition plate body and the weld to bear the shear force together, avoiding cracking due to excessive shear stress in the weld.

[0031] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. An aluminum alloy bridge span top block for a push-type mechanized bridge, comprising: The convex top block (1) and the concave top block (2) are characterized by: The convex top block (1) comprises: a transition plate A (1.1) and a convex bearing block (1.2); the transition plate A (1.1) is interference-fitted with the bridge span body and connected via a weld, and the convex bearing block (1.2) is interference-fitted with the bridge span A (1.1) and connected via screws; The concave top block (2) comprises: a transition plate B (2.1) and a concave bearing block (2.2); the transition plate B (2.1) is interference-fitted with the bridge span body and connected via a weld, and the concave bearing block (2.2) is interference-fitted with the transition plate B (2.1) and connected via screws; The convex bearing block (1.2) and the concave bearing block (2.2) on the opposite sides of the convex top block (1) and the concave top block (2) are pressed against each other and meshed together through convex and concave parts on the convex bearing block (1.2) and the concave bearing block (2.2).

2. The aluminum alloy bridge span top block for a horizontal push type mechanized bridge according to claim 1, characterized in that: The protruding portion of the convex bearing block (1.2) is an arc transition.

3. The aluminum alloy bridge span top block for a horizontal push type mechanized bridge according to claim 1, characterized in that: The convex bearing block (1.2) is interference-fitted with the hole of the transition plate A (1.1) via a pin, and is then connected to the transition plate A (1.1) via a screw.

4. An aluminum alloy bridge span top block for a horizontal push type mechanized bridge as described in any one of claims 1 to 3, characterized in that: The concave bearing block (2.2) is interference-fitted with the hole of the transition plate B (2.1) via a pin, and is then connected to the transition plate B (2.1) via a screw.

5. The aluminum alloy bridge span top block for a horizontal push type mechanized bridge according to claim 1, characterized in that: The transition plate A (1.1) and the transition plate B (2.1) are made of aluminum alloy, and the convex bearing block (1.2) and the concave bearing block (2.2) are made of high-strength steel.

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