Two-way telescopic device at beam end and telescoping method

Abstract

The present application relates to a kind of beam end bidirectional telescopic device and telescopic method, and the driven sleeper and the driven sleeper of fixed transition plate two sides and fixed transition plate two sides are respectively provided with scissor linkage mechanism, the scissor linkage mechanism is adapted to the bridge with fixed transition plate, driven sleeper and driven sleeper together with the variation amount of beam joint width is ±800mm.It is characterized in that: (1) the scissor linkage mechanism is connected between the originality and the fixed transition plate with bidirectional hinge support, can adapt to the horizontal, vertical angle of beam end at beam joint, the whole mechanism rotates flexibly, and is not easy to jam;(2) driven sleeper is connected by bolt and link installation base, and moves freely along with link, and can prevent link foundation from being warped, guarantee the stability of the whole mechanism telescoping;(3) the link and the friction surface of link are provided with ultra-high molecular weight polyethylene small resistance wear pad, can minimize the rotating friction force of link joint, and the strength is reliable;(4) link joint connecting hole and base B connecting hole are provided with high-strength shaft sleeve, can maximize the resistance to shear stress from bolt or base pin.

Description

Technical Field

[0001] This invention relates to a bidirectional telescopic beam end device and telescopic method that, when a large horizontal and vertical rotation angle occurs in the beam joint, and the beam end experiences a rotation angle of more than 10‰, the entire scissor fork mechanism will not deform or jam, and can extend and retract together with the rail expansion joint, simultaneously meeting the needs of horizontal and vertical rotation angle deformation of the beam end, and is flexible in rotation with low friction, thus ensuring the safety of train operation. Background Technology

[0002] CN208250913U, entitled "Scissor fork for beam end lifting device", includes an upper scissor arm assembly and a lower scissor arm assembly, wherein the upper scissor arm assembly and the lower scissor arm assembly are hinged to form multiple hinge point units. Each hinge point unit includes: a pin, which is stepped and includes a snap-fit ​​section, a connecting section, and a threaded section arranged vertically from bottom to top; the upper scissor arm assembly and the lower scissor arm assembly are sleeved on the connecting section, and the upper scissor arm assembly is rotatable relative to the lower scissor arm assembly; a pin adjusting washer, wherein a snap-fit ​​step is formed between the connecting section and the threaded section; the pin adjusting washer is sleeved on the threaded section and snaps into the snap-fit ​​step, and the upper surface of the pin adjusting washer is located above the upper surface of the upper scissor arm assembly; and a fastening component, which cooperates with the threaded section; the lower surface of the fastening component abuts against the upper surface of the pin adjusting washer, and there is a gap between the lower surface of the fastening component and the upper surface of the upper scissor arm assembly. Its shortcomings are: firstly, this patent is applicable to the telescopic device at the end of a one-way telescopic beam, and the beam joint is located between the fixed support 1 and the base of the movable support 3. When the width of the beam joint changes, it will drive the movable support 2 and the movable support 3 to move, thereby driving the extension and retraction of the entire scissor fork; secondly, this patented scissor fork is only applicable to bridges with a small amount of beam joint width extension and retraction, which generally does not exceed ±400mm; thirdly, this patented scissor fork is only applicable to the extension and retraction of bridge beam joints in one direction. When a large angle (above 10‰) occurs at the beam end, the entire scissor fork mechanism will deform and jam, resulting in poor smoothness of the rail top surface, which in turn endangers train operation safety; thirdly, usually the long connecting rod and the short connecting rod are directly connected, or a flat washer is added in the middle, and the friction is large during rotation, which easily causes jamming; fourthly, each rotating pair is directly connected to the pin shaft without bushing, resulting in low overall strength; fifthly, it is generally only applicable to the extension and retraction of bridge beam joints in one direction. When there is an excessively large beam end angle at both ends of the beam joint, the long connecting rod and the short connecting rod are prone to large twisting, and the entire scissor linkage mechanism is prone to jamming.

[0003] CN111155425A, entitled "An Expansion Joint for a Long-Span Railway Steel Bridge," describes an expansion joint comprising a guide chute, an intermediate transition plate, and side transition plates. The guide chute is fitted onto the upper part of the ballast bed of the railway steel bridge. The intermediate transition plate is fixedly installed on the upper part of the guide chute, with side transition plates fitted on both sides of its width. Movable steel sleepers, fixed steel sleepers, and concrete turnout sleepers are fitted onto the upper part of the ballast bed located on the outer sides of both ends of the intermediate and side transition plates in the length direction. The movable, fixed, and concrete turnout sleepers are arranged along the width direction of the intermediate and side transition plates. Both ends of the movable and fixed steel sleepers are connected to the side transition plates via a linkage telescopic mechanism. The railway steel bridge rails are fixedly installed on the upper part of the side transition plates, movable steel sleepers, fixed steel sleepers, and concrete turnout sleepers. This patent application aims to reduce the beam end rotation angle when the steel beam abutments on both sides rotate. The problems are as follows: First, the application reduces the beam end rotation angle by using vibration damping bearings. The scissor linkage mechanism is a transmission mechanism and does not have a two-way hinged bearing. When the bridge deck at the beam joint and beam end undergoes a large rotation angle, the entire scissor linkage mechanism cannot adapt to this change and is prone to jamming. Second, the vibration damping bearings have limited ability to reduce the beam end rotation angle. When the bridge deck at the beam joint and beam end undergoes a large rotation angle, it is easy to damage its structure.

[0004] CN103469726B, entitled "A Large-Displacement Railway Bridge Beam-End Expansion Joint," comprises: concrete sleepers installed on adjacent first and second bridges; fixed steel sleepers, with first and second fixed steel sleepers respectively installed at corresponding beam ends of the two bridges; four support beams installed above the concrete sleepers and fixed steel sleepers along the length of the rails, one end of each support beam being fixed and the other being movable. The fixed end is fixedly connected to the first concrete sleeper and the first fixed steel sleeper installed on the first bridge, and the movable end is movably connected to the second concrete sleeper and the second fixed steel sleeper installed on the second bridge; at least one movable steel sleeper is installed between the first and second bridges and connected to the bottom of the support beams. A significant feature of this patent is that it is a unidirectional expansion beam-end expansion joint device, with a "single scissor linkage" mechanism, using two movable steel sleepers to achieve large-displacement unidirectional expansion and contraction of the beam joint. The problems are as follows: First, it can only be applied to unidirectional expansion and contraction at the beam end, and the total expansion and contraction is limited; second, it uses two movable steel sleepers, which, compared to the single movable steel sleeper mode, has structural instability factors and is prone to jamming; third, it uses a traditional scissor linkage mechanism, which cannot respond and adapt when the beam end has a large vertical or horizontal rotation angle, and is prone to jamming. Summary of the Invention

[0005] Design Objective: To overcome the shortcomings of the prior art, this design presents a reinforced scissor linkage mechanism suitable for bidirectional telescopic beam-end devices. This mechanism can extend and retract along with the rail expansion joint, simultaneously meeting the requirements for horizontal and vertical angular deformation at the beam end. It features flexible rotation and low friction. When the beam joint experiences significant horizontal and vertical angular deformation, exceeding 10‰ at the beam end, the entire scissor mechanism will not deform or jam. It can extend and retract along with the rail expansion joint, simultaneously meeting the requirements for horizontal and vertical angular deformation at the beam end, with flexible rotation and low friction, thus ensuring the safety of train operation.

[0006] Design Scheme: To achieve the above design objectives, this invention employs the following design principles: 1. It utilizes a bidirectional rotating scissor linkage mechanism to adapt to changes in beam end rotation angle. To ensure the continuity, safety, and stability of the railway track structure at the joints of long-span steel bridges, according to the bridge design requirements, a bidirectional expansion joint device at the beam end, along with matching rail expansion joints, needs to be installed at the beam joint. Based on the prior art, this invention modifies the working principle of the prior art, making it suitable for bidirectional expansion joint devices at the beam end. The scissor linkage mechanism must be used in pairs on both sides of the fixed transition plate, with the beam joint located below the fixed transition plate and between the hinged supports. When the beam joint width changes, it will drive the active and driven sleepers to move, thereby causing the scissor linkage mechanisms on both sides to expand and contract, while the position of the central transition plate remains relatively unchanged. The bridge is designed to accommodate beam joint width variations of ±800mm. It adopts a two-way rotating hinge support. When the beam joint undergoes a large horizontal or vertical rotation, causing the active and driven steel sleepers to be non-parallel to the numbered fixed transition plate in multiple directions, the hinge support can be used for adjustment to maintain the smoothness of the rail top surface at all times, thereby ensuring train operation safety.

[0007] The active supports and active steel sleepers are installed and fixed by bolted connectors. The active steel sleepers are connected to the frame foundation by welding. A large number of hook bars are poured together with the track bed slab through concrete at the bottom of the frame foundation. In addition to the frame foundation, all these connectors move with the expansion and contraction of the bridge.

[0008] The driven support and the driven steel sleeper are installed and fixed by bolted connections, and can move left and right on the surface of the frame foundation.

[0009] The concrete turnout slab (track slab) and the bridge deck are connected by concrete pouring, and the bridge deck has a beam joint with variable width between it.

[0010] The transition plate spans the frame foundation and is connected to the scissor linkage mechanism via a two-way hinged support fixed to the bridge deck, enabling it to adapt to bridge deck expansion and contraction and changes in beam end rotation angle.

[0011] Technical Solution 1: A bidirectional expansion joint device at the beam end, wherein the driven steel sleeper on one side of the transition plate and the active steel sleeper on the other side of the transition plate are respectively equipped with scissor linkage mechanisms. One end of the two sets of scissor linkage mechanisms is connected to the bidirectional hinged supports on both sides of the transition plate, and the other end of the two sets of scissor linkage mechanisms is connected to the driven steel sleeper and the active steel sleeper respectively, together adapting to bridges with a beam joint width variation of ±800mm.

[0012] Technical Solution 2: A method for extending and retracting a bidirectional telescopic device at the beam end. The scissor linkage mechanism needs to be used in pairs on both sides of the fixed transition plate. The beam joint is located below the transition plate and between the bidirectional rotating hinge supports. When the beam joint undergoes a large horizontal and vertical rotation angle, causing the active and driven steel sleepers to be non-parallel to the transition plate in multiple directions, adjustments can be made through the bidirectional rotating hinge supports. This allows the scissor linkage mechanism on both sides to extend and retract. At this time, the position of the transition plate in the middle remains relatively unchanged, maintaining the smoothness of the top surface of the rail at all times, thereby ensuring the safety of train operation.

[0013] Compared with the prior art, this invention has the following advantages: First, the scissor linkage mechanism is originally connected to the fixed transition plate by a two-way hinge, which can adapt to the large horizontal and vertical rotation angles at the beam ends of the beam joints. The entire mechanism rotates flexibly and is not easily jammed. Second, the driven steel pillow is connected to the connecting rod mounting base by bolts and moves freely with the extension and retraction of the connecting rod, preventing the connecting rod base from tilting and ensuring the stability of the entire mechanism's extension and retraction. Third, the friction surfaces between the connecting rods are equipped with ultra-high molecular weight polyethylene low-resistance friction-reducing washers, which can minimize the rotational friction of the connecting rod joint while ensuring reliable strength. Fourth, the connecting holes of the connecting rod joints and the connecting holes of base B are equipped with high-strength bushings, which can resist the shear stress from the bolts or base pins to the greatest extent. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a bidirectional expansion joint at the beam end.

[0015] Figure 2 yes Figure 1 Partial top view diagram.

[0016] Figure 3 yes Figure 2 A diagram on the left.

[0017] Figure 4 yes Figure 3 Structural diagram.

[0018] Figure 5 yes Figure 1 A three-dimensional model of the scissor linkage mechanism is shown to illustrate the structure of the invention. Detailed Implementation

[0019] Example 1: Refer to Appendix Figure 1-4 A bidirectional expansion joint device at the beam end, wherein the driven steel sleeper 2 on one side of the transition plate 3 and the active steel sleeper 1 on the other side of the transition plate 3 are respectively equipped with scissor linkage mechanisms. One end of the two scissor linkage mechanisms is connected to the bidirectional rotating hinge support 04 located on both sides of the transition plate 3, and the other end of the two scissor linkage mechanisms is connected to the driven steel sleeper 2 and the active steel sleeper 1 respectively, together adapting to bridges where the width variation of the beam joint 10 is ±800mm.

[0020] The active support 01 and the active steel sleeper 1 are installed and fixed together by bolts. The active steel sleeper 1 is connected to the frame foundation 7 by welding. A large number of reinforcing bars are poured into the lower part of the frame foundation 7 and attached to the track slab 8 by concrete. The active support 01, active steel sleeper 1, and track slab 8 all move with the expansion and contraction of the bridge. The driven support 02 and the driven steel sleeper 2 are installed and fixed together by bolts and can move left and right on the upper surface of the frame foundation 7. The track slab 8 and the bridge deck 9 are connected by concrete pouring, with a variable-width beam joint 10 between the two bridge deck 9 sections. The transition plate 3 spans the frame foundation 7 and is connected to the scissor linkage mechanism via a bidirectional rotating hinge support 04 fixed to the bridge deck, enabling it to adapt to bridge deck expansion and contraction and changes in beam end angle.

[0021] In the scissor linkage mechanism, two long connecting rods 6 are stacked in the middle with holes for inserting bolts to form an X-shaped scissor arm. The bolted hinge of the X-shaped scissor arm is connected to the mounting base A11. The two left arm heads of the X-shaped scissor arm are respectively hinged to one end of the left short connecting rod 5. The other ends of the two left short connecting rods 5 are stacked and hinged through bolt B13 and connected to the mounting base A4. The right arm heads of the X-shaped scissor arm are respectively hinged to one end of the right short connecting rod 5. The other ends of the two right short connecting rods 5 are stacked and hinged to the other end of the connector iron 08 to form a horizontal rotating pair. One end of the connector iron 08 is connected to the mounting base B to form a vertical rotating pair.

[0022] The active steel sleeper 1 is connected to the steel crossbeam at the beam joint or the concrete bridge deck. The lower part of the active steel sleeper 1 is connected to the bridge, and the upper part is connected to the connecting rod mounting base by bolts.

[0023] The driven steel pillow 2 is connected to the connecting rod mounting base by bolts and moves freely with the extension and retraction of the connecting rod.

[0024] The lower part of the mounting base B is welded to the transition plates 3 of the telescopic devices at both ends, and connected to the connector iron 08 via bolt pairs. The other end of the connector iron is connected to the connecting rod, ultimately forming a hinged connection structure that can rotate freely in both vertical and horizontal directions. The connecting rod joint is connected via the mounting base or bolt pairs, and low-resistance anti-friction washers are installed on the friction surfaces between the connecting rods. High-strength bushings are installed in the connecting holes of the connecting rod joints.

[0025] The active steel sleeper 1 is connected to the bridge deck through concrete pouring and moves with the expansion and contraction of the bridge deck at the beam joint.

[0026] There are two mounting bases A4, which are installed and fixed to the active steel sleeper 1 and the driven steel sleeper 2 respectively by bolts D15, ordinary nuts 16, rubber pads 21 and spring washers 22. The rubber pads 21 are placed between the lower surface of the mounting base A4 and the top surface of the steel sleeper.

[0027] The driven steel sleeper 2 is located on the bridge deck without any connection, and the bridge deck provides a supporting surface for the sliding of the driven steel sleeper.

[0028] Mounting base B07 is directly welded to the upper surface of transition plate 3, forming a whole with it.

[0029] The connection between the mounting base B07 and the outer surface of the bushing B101, and the connection between the connector iron 08 and the outer surface of the bushing A09, are both interference fits.

[0030] One end of the connector iron 08 is connected to the mounting base B07 via bolt A12, slotted nut 17, cotter pin 18, and flat washer 20 to form a vertical rotating pair. The other end of the connector iron 08 is connected to the two short connecting rods 5 via bolt B14, slotted nut 17, cotter pin 18, anti-friction washer 19, and flat washer 20 to form a horizontal rotating pair. Both the short connecting rods 5 and the long connecting rod 6 have interference fit bushings C11 at their joints, forming a reinforced rotating pair.

[0031] Example 2: Based on Example 1, a method for extending and retracting a bidirectional telescopic device at the beam end is provided. The scissor linkage mechanism needs to be used in pairs on both sides of the fixed transition plate 3. The beam joint 10 is located below the transition plate 3 and between the bidirectional rotating hinge support 04. When the beam joint undergoes a large horizontal and vertical rotation angle, causing the active steel sleeper 1 and the driven steel sleeper 2 to be non-parallel to the transition plate 3 in multiple directions, they can be adjusted by the bidirectional rotating hinge support 04. This allows the scissor linkage mechanism on both sides to extend and retract. At this time, the position of the transition plate 3 in the middle remains relatively unchanged, maintaining the smoothness of the top surface of the rail at all times, thereby ensuring the safety of train operation.

[0032] The active support 01 and the active steel sleeper 1 are installed and fixed with bolted connectors. The active steel sleeper 1 is connected to the frame foundation 7 by welding. A large number of reinforcing bars are poured into the lower part of the frame foundation 7 and attached to the track slab 8 with concrete. The active support 01, active steel sleeper 1, and track slab 8 all move with the expansion and contraction of the bridge. The driven support 02 and the driven steel sleeper 2 are installed and fixed with bolted connectors and move left and right on the upper surface of the frame foundation 7. The track slab 8 and the bridge deck 9 are connected by concrete pouring, with a variable-width beam joint 10 between the two bridge deck 9 sections. The transition plate 3 spans the frame foundation 7 and is connected to the scissor linkage mechanism through a bidirectional rotating hinge support 04 fixed to the bridge deck, enabling it to adapt to bridge deck expansion and contraction and changes in beam end angle.

[0033] It should be understood that although the above embodiments provide a detailed textual description of the design concept of the present invention, these textual descriptions are merely simple textual descriptions of the design concept of the present invention, and not limitations on the design concept of the present invention. Any combination, addition, or modification that does not exceed the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. A two-way telescoping beam end device characterized by: When the beam gap occurs larger horizontal, vertical corner, its beam end occurs corner 10‰ or more, the whole shear fork mechanism will not be deformed and blocked, and can be stretched with the rail stretcher, at the same time, meet the needs of the horizontal and vertical direction of the beam end corner deformation, and flexible rotation, small friction, the driving support (01) and the driving sleeper (1) are installed and fixed through the bolt connection, the driven support (02) and the driven sleeper (2) are installed and fixed through the bolt connection, and move left and right on the upper surface of the frame foundation (7), the driving sleeper (1) is connected with the frame foundation (7) through welding, the lower part of the frame foundation (7) has a large number of hook ribs which are poured together with the track bed plate (8) through concrete, the track bed plate (8) is connected with the bridge deck (9) through concrete pouring, the width of the beam gap (10) between the two bridge decks (9) is variable, and the driving support (01), the driving sleeper (1) and the track bed plate (8) move with the bridge expansion, the driven sleeper (2) located on one side of the transition plate (3) and the driving sleeper (1) located on the other side of the transition plate (3) are respectively provided with shear link mechanisms, one end of the two sets of shear link mechanisms is connected with the bidirectional rotating hinge support (04) connected on both sides of the transition plate (3), and the other end of the two sets of shear link mechanisms is connected with the driven sleeper (2) and the driving sleeper (1) to adapt to the bridge with the beam gap (10) width change amount of ±800mm; the expansion method of the beam end bidirectional expansion device: the shear link mechanism needs to be used in pairs to fix the two sides of the transition plate (3), the beam gap (10) is located below the transition plate (3) and between the bidirectional rotating hinge supports (04), when the beam gap occurs larger horizontal, vertical corner, the driving sleeper (1), the driven sleeper (2) and the transition plate (3) are not parallel in multiple directions, which can be adjusted through the bidirectional rotating hinge support (04), and then drive the expansion of the shear link mechanism on both sides, at this time, the position of the middle transition plate (3) is relatively unchanged, and the smoothness of the rail top surface is maintained at all times, thereby ensuring the safety of train operation; the middle part of the two long links in the shear link mechanism is inserted into the bolt to form an X shear movable arm, and the bolt hinged part of the X shear movable arm is connected with the mounting base A (4), the left two arm heads of the X shear movable arm are respectively hinged with one end of the left short link, the other end of the two left short links is hinged through the bolt B (13) and connected with the mounting base A (4), the right arm heads of the X shear movable arm are respectively hinged with one end of the right short link, and the other end of the two right short links is hinged with the other end of the joint iron (08) to form a horizontal direction rotating pair, and the joint iron (08) is connected between one end and the mounting base B (07) to form a vertical direction rotating pair.

2. The bidirectional telescoping beam end device of claim 1, wherein: The transition plate (3) spans on the frame foundation (7), is connected with the shear link mechanism through the bidirectional rotating hinge support (04) fixed on the bridge deck, and can adapt to the bridge deck expansion and the beam end corner change.

3. The bidirectional telescoping end-of-beam device of claim 1, wherein: Two active steel sleeper (1) between the transition plate (3), transition plate (3) and active steel sleeper (1) between the driven steel sleeper (2), active steel sleeper (1), driven steel sleeper (2) and transition plate (3) are respectively provided with active support (01), driven support (02) and two-way rotating hinge support (04), active support (01), driven support (02) and two-way rotating hinge support (04) with long connecting rod, short connecting rod together constitute the scissors connecting rod mechanism.

4. The bidirectional telescoping beam end device of claim 3, wherein: The lower part of the mounting base B is welded with the transition plate (3) of the two end expansion devices, and is connected with the joint iron (08) through a bolt pair, and the other end of the joint iron is connected with the connecting rod, so that a hinge connection structure which can freely rotate in vertical and horizontal directions is finally formed.

5. The bidirectional telescoping end-of-beam device of claim 1, wherein: The connecting rod joint is connected through a mounting base or a bolt pair, and a small resistance wear-reducing washer is arranged on the friction surface of the connecting rod.

6. The bidirectional telescoping end-of-beam device of claim 1, wherein: A high-strength shaft sleeve is arranged in the connecting hole of the connecting rod joint.

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