Steel truss girder dragging and pushing sliding block structure

Abstract

The invention provides a steel truss girder dragging and pushing sliding block structure which comprises an upper sliding block and a lower sliding block, the lower sliding block is installed on a sliding way beam in a sliding mode, the upper sliding block is arranged on the top face of the lower sliding block and used for supporting a steel truss girder, and the bottom face of the upper sliding block and the top face of the lower sliding block are of matched wedge-shaped face structures. A driving structure enabling the upper sliding block to move along the wedge-shaped face is arranged between the upper sliding block and the lower sliding block. According to the steel truss girder dragging and pushing sliding block structure, the upper part and the lower part are adopted, the weight of a single block is reduced, manual dragging of the sliding block on a sliding way is facilitated, and operation is convenient; in the pushing process, the sliding block does not need to be continuously disassembled and assembled, the sliding block and the steel truss girder can be tightly attached and disengaged only by adjusting the movable nut, and the construction time is greatly saved.

Description

Technical Field

[0001] The invention belongs to the field of suspension bridge construction, and in particular relates to a steel truss girder dragging and pushing sliding block structure. Background Art

[0002] During the construction of steel trusses of suspension bridges, the assembly of side span steel trusses is a key step in the construction of the superstructure. Due to the restrictions of different bridge terrain conditions, the construction of side span steel beams mostly adopts sliding or jacking schemes. The jacking method not only has the characteristics of low construction cost, light equipment, and fast construction speed, but also does not affect the passage and navigation of existing lines. It has been widely used in my country. At present, there are three main jacking methods: dragging jacking, wedge-type jacking, and walking jacking. Due to the particularity of the steel truss structure, it can only withstand large vertical forces at the node position, and the lower chord generally cannot withstand vertical forces. Therefore, the jacking construction of steel trusses usually adopts the jacking method of dragging.

[0003] The main construction method of the dragging multi-point jacking construction is to set up a through-type continuous jack traction system behind the reaction seat, and use a temporary structure to build a slideway system, then tension the jack, and use the horizontal traction steel strand anchored on the beam to pull the beam to slide on the slideway. The slider is set between the steel truss and the slideway beam, and the material that increases the friction coefficient between the top surface of the slider and the bottom of the steel truss should be laid, while the material that reduces the friction coefficient should be laid between the bottom surface of the slider and the top of the slideway beam. In this way, during the jacking process, the relative position of the slider and the steel truss remains unchanged, and the overall structure slides along the slideway beam.

[0004] At present, conventional sliders generally adopt a box-type structure made of welded steel plates. A single slider is heavy and inconvenient to move on the slide. At the same time, during the jacking process, the slider needs to be constantly dismantled and installed to change its working position, and the construction efficiency is low. Summary of the invention

[0005] In view of this, the present invention aims to propose a steel truss girder dragging and pushing slider structure to solve the above-mentioned technical problems.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A steel truss girder dragging and pushing slider structure comprises an upper slider and a lower slider, wherein the lower slider is slidably installed on a slideway beam, and the upper slider is arranged on the top surface of the lower slider for supporting the steel truss girder, the bottom surface of the upper slider and the top surface of the lower slider are adaptive wedge-shaped surface structures, and a driving structure is arranged between the upper slider and the lower slider to enable the upper slider to move along the wedge-shaped surface.

[0008] Furthermore, the driving structure includes two screw rods, which are arranged on the left and right sides of the lower sliding block. The screw rods are inclined and the inclined direction corresponds to the wedge-shaped top surface of the lower sliding block. Each screw rod is correspondingly provided with a connecting block and two anchor blocks, wherein the connecting block is provided on the upper sliding block, and the two anchor blocks are provided on the lower sliding block, and the two anchor blocks are arranged on both sides of the connecting block one after the other. The screw rod passes through its corresponding connecting block and the two anchor blocks, and the corresponding connecting block of the screw rod is provided with two fixing nuts, and the two fixing nuts clamp the connecting block, and the corresponding two anchor blocks of the screw rod are respectively provided with movable nuts, and the movable nuts are located on the outside of the corresponding anchor blocks.

[0009] Furthermore, the lower slider is provided with a horizontal traction steel strand, and the horizontal traction steel strand passes through the interior of the lower slider and is anchored to the lower slider to provide traction for the overall sliding.

[0010] Furthermore, a rubber plate is arranged on the top of the upper sliding block.

[0011] Furthermore, a polytetrafluoroethylene slide plate is provided at the bottom of the lower slide block corresponding to the slideway beam.

[0012] Compared with the prior art, the steel truss girder dragging and pushing slider structure described in the present invention has the following advantages:

[0013] The steel truss girder dragging and pushing slider structure of the present invention adopts an upper and lower two-part structure, which reduces the weight of a single block, facilitates manual dragging of the slider on the slideway, and is easy to operate; during the pushing process, the slider does not need to be constantly removed and installed, and the slider and the steel truss girder can be closely attached or separated only by adjusting the movable nut, which greatly saves construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a front view of a steel truss girder dragging and pushing slider structure according to an embodiment of the present invention;

[0016] Figure 2 A side view of a steel truss girder dragging and pushing slider structure according to an embodiment of the present invention;

[0017] Figure 3 This is a state diagram of step 1 in the process of pushing a steel truss beam according to the present invention;

[0018] Figure 4 This is a state diagram of step 2 in the process of pushing a steel truss beam in the present invention;

[0019] Figure 5 This is a state diagram of step three in the process of pushing a steel truss beam in the present invention;

[0020] Figure 6 This is a state diagram of step 4 in the process of pushing the steel truss beam of the present invention;

[0021] Figure 7 This is a state diagram of step five in the process of pushing a steel truss beam according to the present invention.

[0022] Description of reference numerals:

[0023] 1-Rubber sheet; 2-Upper slider; 3-Lower slider; 4-PTFE slide plate; 5-Screw; 6-Moving nut; 7-Fixed nut; 8-Horizontal traction steel strand; 9-Connection block; 10-Anchor block. 11-Steel truss beam segment; 12-Slideway beam; 13-Continuous jack; 14-First slider 14; 15-Second slider; 17-Temporary pad; 18-Jack. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] like Figure 1 , Figure 2 As shown, a steel truss girder dragging and pushing slider structure, the slider adopts a split structure, including an upper slider 2 and a lower slider 3, wherein the lower slider 3 is slidably arranged on the slideway beam 12, and the upper slider 2 is arranged on the top surface of the lower slider 3. When the slider pushes the steel truss girder, the steel truss girder segment 11 is supported by the upper slider 2. The bottom surface of the upper slider 2 and the top surface of the lower slider 3 are adapted wedge-shaped surface structures that form an angle with the slideway beam 12, and a driving structure is arranged between the upper slider 2 and the lower slider 3 to move the upper slider 2 along the wedge-shaped surface.

[0026] The driving structure includes two screw rods 5 arranged obliquely on the left and right sides of the lower slider 3, and the oblique direction of the screw rods 5 corresponds to the wedge-shaped top surface of the lower slider 3. Each screw rod 5 is provided with a corresponding connection block 9 and two anchor blocks 10, wherein the connection block 9 is provided on the upper slider 2, and the two anchor blocks 10 are provided on the lower slider 3, and the two anchor blocks 10 are arranged on both sides of the connection block 9 one after the other, and the screw rod 5 passes through its corresponding connection block 9 and the two anchor blocks 10, and the screw rod 5 is fixed with two fixing nuts 7 corresponding to the connection block 9, such as spot welding the fixing nuts 7 and the screw rod 5, and the two fixing nuts 7 clamp the connection block 9, and the screw rod 5 is provided with movable nuts 6 corresponding to the two anchor blocks 10, and the movable nuts 6 are located on the outside of the corresponding anchor blocks 10. As the movable nuts 6 are turned, the screw rod 5 moves, driving the upper slider 2 to move along the wedge surface, thereby realizing the close contact and separation between the upper slider 2 and the steel truss 11.

[0027] In the present invention, the power source for the lower slider 3 to slide along the slide beam 12 is preferably a continuous jack ( Figure 1 , Figure 2(not shown), a horizontal traction steel strand 8 is used to connect the lower slider 3 and the continuous jack. The horizontal traction steel strand 8 passes through the interior of the lower slider 3 and is anchored on the lower slider 3 to provide traction for the overall sliding.

[0028] In the present invention, a rubber plate 1 is provided on the upper slider 2, and the rubber plate 1 is located between the upper slider 2 and the steel truss 11. The rubber plate 1 has a large friction force, which improves the stability of the slider supporting the steel truss 11, and prevents the slider from moving relative to the steel truss 11, so that the steel truss 11 can move along the slideway beam 12 with the slider as a whole, and the steel truss 11 is pushed. A polyfluoro slide plate 4 is provided on the bottom surface of the lower slider 3, and the polyfluoro slide plate 4 is located between the lower slider 3 and the slideway beam 12. The polyfluoro slide plate 4 has a small friction force, which reduces the friction force of the slider sliding on the slideway beam 12, and facilitates the overall sliding of the slider.

[0029] When the present invention is in operation, a section of steel truss segment 11 is supported by the upper slider 2 in the pushing slider structure, and the supporting point is the node of the steel truss segment 11. At this time, the slider is in a load-bearing state, and then the horizontal traction steel strand 8 is tensioned by continuous jacks, and the slider as a whole (carrying the steel truss 11 to move) realizes the pushing construction of the steel truss segment. After the pushing of a section of steel truss segment 11 is completed, a temporary pad is used to support the steel truss segment 11, and the slider is unloaded, that is, the upper slider 2 screws the movable nut 6 to change the position of the screw 5, driving the upper slider 2 of the slider to slide downward until the top rubber block 4 is separated from the steel truss segment 11, and the slider is manually dragged backward along the slide beam 12 to the next section of the steel truss segment 11, and the above process is repeated to support and push the next section of the steel truss segment 11.

[0030] Alternatively, when two sliders are used to perform the dragging and pushing operation on the steel truss, the two sliders are named the first slider 14 and the second slider 15 respectively. The first slider 14 and the second slider 15 share a horizontal traction steel strand 8 and a continuous jack 13. The first slider 14 is located between the second slider 15 and the continuous jack 13. The second slider 15 is anchored and connected to the horizontal traction steel strand 8. The first slider 14 is slidably connected to the horizontal traction steel strand 8, that is, the horizontal traction steel strand 8 slides out of the first slider 14, and the first slider 14 can move along the horizontal traction steel strand 8. The process of dragging and pushing the steel truss is as follows:

[0031] Step 1: If Figure 3As shown, the steel truss segment 11E (N) and the steel truss segment 11E (N-1) are respectively supported on the first slider 14 and the second slider 15, and the first slider 14 and the second slider 15 are respectively supported on the nodes of the corresponding steel truss segments. At this time, the first slider 14 and the second slider 15 are in a load-bearing state locked by the movable nut 6. The horizontal traction steel strand 8 is pulled by the continuous jack 13, and the whole slides forward along the slideway beam 12 by an interval distance to complete a jacking construction. After jacking, the horizontal traction steel strand 8 is released.

[0032] Step 2: If Figure 4 As shown, assemble the steel truss segment 11E(N-2) on the platform, and use the temporary pad 17 to pad the steel truss segment 11E(N-2), set the temporary pad 17 close to the first slider 14 and on its outside, temporarily pad the steel truss segment 11E(N-1), and then adjust the first slider 14 to the unloading state. The adjustment method is to turn the movable nut 6, change the position of the screw 5, and drive the upper slider 2 of the first slider 14 to slide downward until the top rubber block 4 is separated from the steel truss segment 11E(N).

[0033] Step 3: If Figure 5 As shown, the first slider 14 is manually dragged backward along the slide beam to the right below the node of the steel truss segment 11E (N-1), adjacent to the second slider 15. The first slider 14 is adjusted to the load-bearing state, and then the second slider 15 is adjusted to the unloading state. The unloading adjustment method is detailed in step 2. The load-bearing adjustment method is still to screw the movable nut 6, change the position of the screw 15, and drive the upper slider 2 of the first slider 14 to slide upward until the top rubber block 4 is in close contact with the steel truss segment 11E (N-1), so that the first slider 14 and the second slider 15 can alternately support the steel truss segment 11E (N-1).

[0034] Step 4: If Figure 6 As shown, the second slider 15 is manually dragged backward along the slide beam 12 to the position directly below the node of the steel truss beam segment 11E (N-2), and the second slider 15 is in an unloaded state. A jack 18 is arranged below the steel truss beam segment 11E (N-1) to support the steel truss beam segment 11E (N-1), so that the first slider 14 is unloaded and detached from the steel truss beam segment 11E (N-1), and then the first slider 14 is manually dragged to the position directly below the node of the steel truss beam segment 11E (N-1) and adjusted to a load-bearing state, and the jack 18 is unloaded, so that the steel truss beam is supported on the first slider 14.

[0035] Step 5: If Figure 7As shown, the second slider 15 is adjusted to the load-bearing state. The debugging method is shown in step three. The temporary pad and jack 18 of the steel truss segment 11E (N-2) are removed. At this time, the first slider 14 and the second slider 15 are both in the load-bearing state, supporting the steel truss segment 11E (N-1) and the steel truss segment 11E (N-2) respectively. The continuous jack 13 is opened to tension the steel strands and push the steel truss.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel truss girder dragging and pushing slider structure, characterized in that: The invention comprises an upper slider (2) and a lower slider (3), wherein the lower slider (3) is slidably mounted on a slideway beam (12), the upper slider (2) is arranged on the top surface of the lower slider (3), the bottom surface of the upper slider (2) and the top surface of the lower slider (3) are adapted wedge-shaped surface structures, and a driving structure is arranged between the upper slider (2) and the lower slider (3) to enable the upper slider (2) to move along the wedge-shaped surface.

2. A steel truss girder dragging and pushing slider structure according to claim 1, characterized in that: The driving structure comprises two screw rods (5), which are arranged on the left and right sides of the lower slider (3). The screw rods (5) are arranged tilted, and the tilting direction corresponds to the wedge-shaped top surface of the lower slider (3). Each screw rod (5) is provided with a corresponding connection block (9) and two anchor blocks (10), wherein the connection block (9) is provided on the upper slider (2), and the two anchor blocks (10) are provided on the lower slider (3), and the two anchor blocks (10) are arranged on both sides of the connection block (9) one after the other. The screw rod (5) passes through its corresponding connection block (9) and the two anchor blocks (10), and the connection block (9) corresponding to the screw rod (5) is provided with two fixing nuts (7), and the two fixing nuts (7) clamp the connection block (9), and the two anchor blocks (10) corresponding to the screw rod (5) are respectively provided with movable nuts (6), and the movable nuts (6) are located on the outside of the corresponding anchor block (10).

3. The steel truss girder dragging and pushing slider structure according to claim 1 is characterized in that: The lower slider (3) is provided with a horizontal traction steel strand (8), and the horizontal traction steel strand (8) passes through the interior of the lower slider (3) and is anchored to the lower slider (3) to provide traction for the overall sliding.

4. The steel truss girder dragging and pushing slider structure according to claim 1 is characterized in that: A rubber plate (1) is arranged on the top of the upper sliding block (2).

5. The steel truss girder dragging and pushing slider structure according to claim 1 is characterized in that: A polyfluoro slide plate (4) is provided at the bottom of the lower slide block (3) corresponding to the slideway beam (12).

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