Underground shallow buried bridge expansion device

Abstract

The present invention belongs to the field of bridge construction and specifically discloses a submerged, shallow-buried bridge expansion and contraction device. A connecting hole for a crossbeam is provided on the web of the center beam. The crossbeam is welded to the center beam after passing through the connecting hole. A center beam reinforcement plate is fixed to the lower end of the center beam and is located directly below the crossbeam. The upper end of a support box is positioned at a lower height than the upper end of the center beam. A limiting hole is provided at the upper end of the support box, located on an upper elastic support member. The upper end of the upper elastic support member is inserted into the through hole and is limited by the inner wall of the limiting hole. A cover plate for closing the limiting hole is fixed to the upper end of the support box. The upper end of the cover plate is positioned at a lower height than the upper end of the center beam. The solution of the present invention can solve the problem that the expansion and contraction device is too high to be suitable for thin-walled beams.

Description

Technical Field

[0001] The invention belongs to the field of bridge construction, and in particular relates to an underground shallow-buried bridge expansion device. Background Art

[0002] In order to adapt to the expansion and deformation of the bridge structure under temperature changes, expansion joints are set at regular intervals on the bridge, and expansion devices are installed in the expansion joints, such as Figure 1 As shown, the modular telescopic device in the prior art includes a center beam 1, side beams 2 located on both sides of the center beam 1, a cross beam 11 fixed to the lower end of the center beam 1, a support box 4 for installing the cross beam 11, and a rubber belt 3 connected between the center beam 1 and the side beams 2. Both ends of the cross beam 11 are inserted into the support box 4. Elastic support members are provided on the upper and lower sides of the cross beam 11 in the support box 4. A spring 16 for controlling the displacement and reset of the cross beam 11 is installed between the end of the cross beam 11 and the support box 4. The spring 16 is usually a polyurethane spring.

[0003] The above-mentioned telescopic device has a relatively high height, usually between 280-320 mm, because the cross beam 11 is arranged at the lower end of the middle beam 1, and the overall height includes the sum of the height of the middle beam 1 and the height of the cross beam 11. In order to install the telescopic device, a mounting groove with a depth of 350-400 mm is required to be reserved on the bridge, which is not suitable for the needs of thin-walled beams. Specifically, since a larger mounting groove must be reserved on the thin-walled beam, the casting template of the bridge is irregular, which increases the difficulty of construction, and the original flip hydraulic template used for processing thin-walled beams cannot be directly used. It is necessary to design a separate template to process the bridge, which greatly increases the difficulty of construction.

[0004] Therefore, in order to reduce the height of the telescopic device, some existing technologies have directly provided a groove at the lower end of the center beam 1, and embedded the crossbeam 11 at the lower end of the center beam 1, thereby reducing the sum of the heights of the center beam 1 and the crossbeam 11. However, this method will reduce the bearing capacity of the center beam 1, resulting in poor durability of the telescopic device. At the same time, embedding the crossbeam 11 at the lower end of the center beam 1 is equivalent to raising the height of the crossbeam 11 relatively upward, and the height of the support box 4 will also be raised accordingly. This will cause the upper end of the support box 4 to be exposed on the bridge surface. In particular, to ensure that the expansion and contraction of the spring 16 is sufficient to accommodate the displacement of the crossbeam 11, the installation space required for the spring 16 in the support box 4 will also be relatively large. This will result in a larger width of the support box 4, that is, the area of ​​the support box 4 exposed on the bridge surface will be larger, which is not aesthetically pleasing. Even if a thin layer of concrete can be poured on the upper surface of the support box 4, the thin concrete surface layer is easily damaged due to the large area of ​​the upper surface of the support box 4. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an underground, shallow-buried bridge expansion device to solve the problem that the expansion device is too high and is not suitable for thin-walled beams.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The buried shallow-buried bridge expansion device includes a connection structure, a support structure and a displacement control structure. The connection structure includes a center beam and side beams arranged on both sides of the center beam, and a rubber belt is installed between the center beam and the side beams; the support structure includes a crossbeam connected to the center beam and a support box located on both sides of the center beam, both ends of the crossbeam extend into the support box, and upper elastic support members are provided on the upper side of the crossbeam in the support box, and lower elastic support members are provided on the lower side of the crossbeam in the support box; the displacement control structure is used to assist the crossbeam or the support box to move laterally through elastic force when the crossbeam or the support box moves laterally The beam or support box is reset; a connecting hole for the crossbeam to pass through is provided on the web of the center beam, and the crossbeam is welded to the center beam after passing through the connecting hole, and a center beam reinforcement plate is fixed to the lower end of the center beam, and the center beam reinforcement plate is located directly below the crossbeam; the position height of the upper end of the support box is lower than the position height of the upper end of the center beam, and a limiting hole is provided at the upper end of the support box at the upper elastic support member, and the upper end of the upper elastic support member is inserted into the limiting hole and is limited by the inner wall of the limiting hole, and a cover plate for closing the limiting hole is fixed to the upper end of the support box, and the position height of the upper end of the cover plate is lower than the position height of the upper end of the center beam.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The crossbeam passes through the connection hole opened on the web of the center beam and is welded, which reduces the overall height. The connection strength between the center beam and the crossbeam is improved by welding, thereby reducing the impact of the connection hole opened on the center beam on the bearing strength of the center beam. At the same time, a center beam reinforcement plate is added at the lower end of the center beam to strengthen the bearing capacity of the center beam at this point, further reducing the impact of the connection hole opened on the center beam on the bearing capacity of the center beam.

[0010] In this solution, by passing the crossbeam through the web of the center beam, the overall height of the bridge expansion device is reduced to the greatest extent, and is suitable for thin-walled beams.

[0011] 2. By separating the support structure and the displacement control structure, the size of the support box only needs to meet the movement requirements of the beam, which reduces the size of the support box and makes it easier to pour concrete near the support box.

[0012] 3. The upper ends of the support box and the cover plate are lower than the upper end of the center beam, so that the support box and the cover plate can be buried under the bridge without being exposed on the surface of the bridge.

[0013] In addition, in order to reduce the height of the support box while ensuring the elastic deformation of the upper elastic support member, the upper end of the upper elastic support member is set in a limiting hole. On the one hand, the limiting hole limits the upper elastic support member on all sides, eliminating the need for additional limiting structures to install the upper elastic support member in the support box. On the other hand, the height of the cover plate set only at the limiting hole protrudes from the height of the support box, while the height of the rest of the upper end of the support box can be reduced, allowing the support box to be better buried in the bridge, avoiding the situation where the upper surface of the support box is only shallowly buried in the bridge surface, resulting in poor anchoring effect of the support box. Moreover, compared with the area of ​​the cover plate, the upper surface of the support box is larger, and the concrete covering the larger and shallower area on the surface of the support box is also easily damaged. Therefore, by reducing the height of the other parts of the support box, the concrete pouring thickness at other locations can be increased, excluding the smaller area of ​​the cover plate, thereby achieving a better pouring effect. At the same time, the step formed between the cover plate and the upper surface of the support box is equivalent to providing a protruding cover plate on the support box and inserting it into the poured concrete, thereby improving the anchoring strength of the support box in the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a modular telescopic device in the background technology of the present invention.

[0015] Figure 2 Schematic diagram of the overall structure of an embodiment of the present invention.

[0016] Figure 3 for Figure 2 Cross-sectional view of the support structure.

[0017] Figure 4 for Figure 2 Schematic diagram of the displacement control structure.

[0018] Figure 5 A structural diagram of another arrangement of the support structure.

[0019] Figure 6 A structural diagram of another setting method of the displacement control structure.

[0020] In the figure: 1. Center beam; 2. Side beam; 3. Rubber belt; 4. Support box; 5. Cover plate; 6. Support reinforcement plate; 7. Through hole; 8. Mounting box; 9. Anchor ring; 10. Center beam reinforcement plate; 11. Cross beam; 12. Lower elastic support member; 13. Upper elastic support member; 14. Center beam reinforcement rod; 15. Groove; 16. Spring; 17. Guide rod; 18. Mounting plate; 19. Limit plate; 20. Side beam reinforcement rod. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings, and specific implementation methods will be given.

[0022] like Figure 2 As shown, the buried shallow-buried bridge expansion device includes a connection structure, a support structure, and a displacement control structure. The connection structure includes a center beam 1 and side beams 2 provided on both sides of the center beam 1. A rubber belt 3 is installed between the center beam 1 and the side beams 2. The installation and connection method of the rubber belt 3 and the center beam 1 and side beams 2 is the existing technology and will not be improved or described in detail in this application. A number of anchor rings 9 distributed along the length of each side beam 2 are fixed to each side of the side beam 2. The anchor rings 9 are used to anchor in concrete. The specific configuration of the anchor rings 9 is also the existing technology and will not be improved or described in detail in this application.

[0023] Combine Figure 3 As shown, the support structure includes a crossbeam 11 connected to the center beam 1 and support boxes 4 located on both sides of the center beam 1. The web of the center beam 1 is provided with connection holes for the crossbeam 11 to pass through. After passing through the connection holes, the crossbeam 11 is welded to the center beam 1. Full penetration welding is used during welding to improve the fatigue resistance of the center beam 1. The crossbeam 11 is made of low-alloy high-strength steel Q460 or above, which has excellent welding performance and improves its support strength to meet the load-bearing requirements. A center beam reinforcement plate 10 is fixed to the lower end of the center beam 1. The center beam reinforcement plate 10 is located directly below the crossbeam 11. By providing the center beam reinforcement plate 10, the load-bearing capacity of the center beam 1 at this location is strengthened, further reducing the impact of the connection holes on the load-bearing capacity of the center beam 1.

[0024] Both ends of the beam 11 extend into the support box 4. The support box 4 is provided with a socket for inserting the beam 11. The beam 11 is slidably arranged relative to the socket. An upper elastic support member 13 is provided on the upper side of the beam 11 in the support box 4, and a lower elastic support member 12 is provided on the lower side of the beam 11 in the support box 4. The upper elastic support member 13 and the lower elastic support member 12 are both made of elastic materials, such as rubber. The movement of the beam 11 is damped and supported by the upper elastic support member 13 and the lower elastic support member 12. The upper elastic support member 13 and the lower elastic support member 12 are both fixed to the inner wall of the support box 4, and are both against the beam 11, but have no substantial connection with the beam 11.

[0025] The upper end of the support box 4 is fixed to the side beam 2, and the position height of the upper end of the support box 4 is lower than the position height of the upper end of the center beam 1. A limiting hole is provided at the upper end of the support box 4 at the upper elastic support member 13. The upper end of the upper elastic support member 13 is inserted into the limiting hole and is limited by the inner wall of the limiting hole. A cover plate 5 for closing the limiting hole is fixed to the upper end of the support box 4. Specifically, the cover plate 5 is welded to the upper end of the support box 4, and the position height of the upper end of the cover plate 5 is lower than the position height of the upper end of the center beam 1.

[0026] Combine Figure 4As shown, the displacement control structure is used to assist the cross beam 11 or the support box 4 to reset through elastic force when the cross beam 11 or the support box 4 is laterally displaced. The support structure and the displacement control structure are arranged side by side along the length direction of the center beam 1. If multiple groups of support structures and displacement control structures are provided, they are arranged in sequence according to the distribution pattern of support structure-displacement control structure-support structure-displacement control structure.

[0027] The displacement control structure includes guide rods 17 fixed to both sides of the center beam 1, springs 16 mounted on the guide rods 17, and a mounting plate 18 for mounting the springs 16. The mounting plate 18 is fixed to the lower end of the side beams 2 and provides a certain degree of support for the side beams 2. The mounting plate 18 is provided with mounting holes for the guide rods 17 to pass through. The guide rods 17 and the mounting holes are slidably connected, or the guide rods 17 and the inner wall of the mounting holes do not contact each other. In this embodiment, the inner diameter of the mounting hole is larger than the outer diameter of the guide rods 17, that is, the guide rods 17 and the inner wall of the mounting holes do not contact each other. A mounting box 8 is fixed to the side of the mounting plate 18 facing away from the center beam 1, and the guide rods 17 are inserted into the mounting box 8. The spring 16 is arranged between the mounting plate 18 and the center beam 1, and the two ends of the spring 16 are respectively fixed to the mounting plate 18 and the center beam 1.

[0028] When the center beam 1 is subjected to the external force of the vehicle and produces a lateral displacement, the center beam 1 drives the cross beam 11 and the guide rod 17 to move laterally, and the springs 16 on both sides of the center beam 1 also produce contraction or extension deformation. Figure 4 Taking the direction shown in as an example, if the center beam 1 moves to the right, the spring 16 on the right side of the center beam 1 contracts and the spring 16 on the left side of the center beam 1 stretches. After the external force disappears, the center beam 1 is reset by the restoring force of the spring 16.

[0029] When the bridge expands due to heat, the support boxes 4 and installation boxes 8 embedded within the bridge move toward the center beam 1, causing the springs 16 on both sides of the center beam 1 to contract. When the bridge's temperature decreases and the expansion effect disappears, the restoring force of the springs 16 assists the support boxes 4 and installation boxes 8 in returning to their original positions as the bridge returns to its original position. Conversely, when the bridge contracts due to cold, the support boxes 4 and installation boxes 8 embedded within the bridge move away from the center beam 1, causing the springs 16 on both sides of the center beam 1 to stretch. When the bridge's temperature increases and the contraction effect disappears, the restoring force of the springs 16 assists the support boxes 4 and installation boxes 8 in returning to their original positions as the bridge returns to its original position.

[0030] In this solution, the spring 16 is directly arranged between the center beam 1 and the mounting plate 18 fixed to the lower end of the side beam 2, shortening the force transmission path of the spring 16 when it is subjected to force, so that the spring 16 can transmit the restoring force to the mounting plate 18 or the center beam 1 more promptly and evenly.

[0031] In another embodiment of the present invention, Figure 6As shown, the arrangement of the displacement control structure is different. In this embodiment, the support structure and the displacement control structure are arranged side by side along the length direction of the center beam 1. The displacement control structure includes a guide rod 17 fixed on both sides of the center beam 1, a spring 16 sleeved on the guide rod 17, and a mounting plate 18 for mounting the spring 16. The mounting plate 18 is fixed to the side beam 2, and a mounting hole for the guide rod 17 to pass through is opened on the mounting plate 18. A mounting box 8 is fixed on the side of the mounting plate 18 facing away from the center beam 1, and the guide rod 17 is inserted into the mounting box 8; a limit plate 19 is fixed to one end of the guide rod 17 inserted into the mounting box 8, and the spring 16 is arranged between the limit plate 19 and the mounting plate 18, and both ends of the spring 16 are fixed to the mounting plate 18 and the limit plate 19 respectively.

[0032] In this solution, the spring 16 is arranged in the mounting box 8. When the guide rod 17 and the mounting plate 18 produce relative lateral displacement, the distance between the limit plate 19 and the mounting plate 18 increases or decreases, driving the spring 16 to stretch or contract, and then the restoring force of the spring 16 can assist in resetting.

[0033] In another embodiment of the present invention, Figure 6 As shown, an inclined side beam reinforcement rod 20 is fixed between the installation box 8 and the side beam 2, and a triangular space is formed between the side beam reinforcement rod 20, the outer wall of the installation box 8, and the side beam 2, thereby improving the connection strength between the installation box 8 and the side beam 2, so that the installation box 8 has a supporting effect on the side beam 2. The provision of the side beam reinforcement rod 20 also increases the connection strength between the installation box 8 and the bridge when cast in the bridge.

[0034] In another embodiment of the present invention, Figure 3 As shown, a number of support reinforcement plates 6 are fixed to the outer wall of the support box 4, and through holes 7 are opened on the support reinforcement plates 6. By setting the support reinforcement plates 6, the contact area between the support box 4 and the bridge is increased, and the connection strength is improved. After the poured concrete is filled in the through holes 7, the connection strength between the support box 4 and the bridge can be further improved.

[0035] In another embodiment of the present invention, Figure 5 As shown, the support reinforcement plate 6 is V-shaped and both ends are fixed to the outer wall of the support box 4, that is, a stable triangular structure is formed between the support reinforcement plate 6 and the outer wall of the support box 4, thereby improving the connection strength between the support box 4 and the bridge.

[0036] In another embodiment of the present invention, Figure 5 As shown, inclined center beam reinforcement rods 14 are fixed on both sides of the center beam reinforcement plate 10 and between the cross beam 11. By adding the center beam reinforcement rods 14, the connection strength between the center beam 1 and the cross beam 11 is further increased, so that the force of the center beam 1 can be better transmitted to the cross beam 11, thereby improving the bearing strength of the center beam 1.

[0037] In another embodiment of the present invention, Figure 5 As shown, a plurality of protrusions or grooves 15 are provided on the upper end of the support box 4. By providing the protrusions or grooves 15, the contact area between the upper end of the support box 4 and the bridge is increased, thereby achieving a better anchoring effect. Figure 5 As shown in FIG, a plurality of grooves 15 are provided on the upper end of the support box 4. It should be noted that in actual design, if a protrusion is provided on the upper end of the support box 4, the position height of the upper end of the protrusion cannot be higher than the position height of the upper end of the cover plate 5.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An underground, shallow-buried bridge expansion and contraction device, comprising a connection structure, a support structure, and a displacement control structure. The connection structure comprises a center beam and side beams disposed on either side of the center beam, with rubber belts installed between the center beam and the side beams. The support structure comprises a crossbeam connected to the center beam and support boxes disposed on either side of the center beam, with both ends of the crossbeam extending into the support boxes. Upper elastic supports are disposed within the support boxes on the upper side of the crossbeam, and lower elastic supports are disposed within the support boxes on the lower side of the crossbeam. The displacement control structure is used to assist the crossbeam or support box in resetting itself through elastic force when the crossbeam or support box is laterally displaced. The device is characterized in that: The web of the center beam is provided with a connection hole for the cross beam to pass through. The cross beam is welded to the center beam after passing through the connection hole. A center beam reinforcement plate is fixed to the lower end of the center beam, and the center beam reinforcement plate is located directly below the cross beam. The upper end of the support box is positioned at a height lower than the upper end of the center beam. A limiting hole is provided at the upper end of the support box at the upper elastic support member. The upper end of the upper elastic support member is inserted into the limiting hole and is limited by the inner wall of the limiting hole. A cover plate for closing the limiting hole is fixed to the upper end of the support box. The upper end of the cover plate is positioned at a height lower than the upper end of the center beam. A plurality of protrusions or grooves are provided at the upper end of the support box. A number of anchor rings distributed along the length direction are fixed on both sides of the side beam.

2. The buried shallow-buried bridge expansion device according to claim 1 is characterized in that: The support structure and the displacement control structure are arranged side by side along the length direction of the center beam. The displacement control structure includes guide rods fixed on both sides of the center beam, springs sleeved on the guide rods, and a mounting plate for mounting the springs. The mounting plate is fixed to the side beams, and a mounting hole for the guide rods to pass through is opened on the mounting plate. A mounting box is fixed on the side of the mounting plate facing away from the center beam, and the guide rods are inserted into the mounting box. The spring is arranged between the mounting plate and the middle beam, and both ends of the spring are fixed to the mounting plate and the middle beam respectively.

3. The buried shallow-buried bridge expansion device according to claim 1 is characterized in that: The support structure and the displacement control structure are arranged side by side along the length direction of the center beam. The displacement control structure includes guide rods fixed on both sides of the center beam, springs sleeved on the guide rods, and a mounting plate for mounting the springs. The mounting plate is fixed to the side beams, and a mounting hole for the guide rods to pass through is opened on the mounting plate. A mounting box is fixed on the side of the mounting plate facing away from the center beam, and the guide rods are inserted into the mounting box. One end of the guide rod inserted into the installation box is fixed with a limit plate, a spring is arranged between the limit plate and the installation plate, and two ends of the spring are respectively fixed with the installation plate and the limit plate.

4. The buried shallow-buried bridge expansion device according to claim 2 or 3, characterized in that: An inclined side beam reinforcement rod is fixed between the installation box and the side beam, and a triangular space is formed among the side beam reinforcement rod, the outer wall of the installation box and the side beam.

5. The buried shallow-buried bridge expansion device according to claim 1 is characterized in that: A plurality of support reinforcement plates are fixed to the outer wall of the support box.

6. The buried shallow-buried bridge expansion device according to claim 5, characterized in that: The support reinforcement plate is provided with a through hole.

7. The buried shallow-buried bridge expansion device according to claim 6, characterized in that: The support reinforcement plate is V-shaped and both ends are fixed to the outer wall of the support box.

8. The buried shallow-buried bridge expansion device according to claim 1 is characterized in that: Inclined center beam reinforcement rods are fixed on both sides of the center beam reinforcement plate and between the cross beams.

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