Detachable multi-directional deformation device for bridge expansion joint
Through the design of detachable bridge telescopic seams, the multi -directional deformation device is used, and the cylindrical steel plate box and the limited card tooth card slot structure are used to solve the problem of easily damaging and difficult replacement of bolts in existing technologies. Cost reduction.
Patent Information
- Application Number
- CN202420020442.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-04
AI Technical Summary
In the existing bridge expansion joint device, the strength of the bolt head and the limit steel plate welded is reduced, and the bolts are easily damaged and difficult to replace, resulting in the problem of breakage and cost increase in the structure during use.
Design a detachable bridge telescopic seam multi -directional deformation device, adopts cylindrical steel plate box and bottom plate, fix the connection through welding, the screw and rubber body is set internally, the top plate can be removed through limited card teeth and card slots to achieve removable connection. , Cancel the limited steel plate and reduce the amount of welding.
The simplicity replacement of the damaged components is realized, the cost and construction period is reduced, the durability and operating convenience of the structure is improved, and the problem of bolt break and rubber damage is avoided.
Smart Images
Figure CN222412605U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge expansion joints, and in particular to a detachable bridge expansion joint multi-directional deformation device. Background Art
[0002] Article 3.1 of the General Technical Specifications for Highway Bridge Expansion Devices (JT / T 327-2016) defines: "Expansion joints are gaps set in the superstructure to accommodate the deformation of the bridge structure. Bridge expansion devices are a general term for various devices set at expansion joints to allow vehicles to pass smoothly through the bridge deck and meet the deformation of the bridge superstructure."
[0003] The expansion joint device needs to have a wide range of displacement capacity in the longitudinal direction. Since the concrete structure will change in each axial direction with the change of temperature, that is, the so-called thermal expansion and contraction. Taking the three-span concrete continuous beam with a span of (100+120+100)m under the temperature difference of -10~+40°C as an example, the expansion value caused by temperature in the longitudinal direction can reach 16cm. The existing technology can well meet the displacement capacity requirements by setting the upper steel plate to a comb-tooth shape.
[0004] The expansion joint device needs to have multi-directional deformation capabilities. For long-span bridges, when the vehicle load is concentrated on the mid-span of the beam structure, the mid-span section will produce a certain degree of deflection, and the support section will produce an upward tilt relative to the abutment. In other words, the expansion joint corresponding to the beam support section will produce a vertical torsion relative to the abutment. In addition, for bridges in coastal or canyon areas, horizontal wind loads often cause the bridge to twist laterally relative to the abutment, so the expansion joint device must have the ability to deform in multiple directions. The expansion joint device of the prior art is shown in the figure of the specification. Figure 1 As shown, a square steel plate box 3 is embedded in the concrete below the upper steel plate, elastic materials such as a rubber cylinder 8 are arranged in the steel plate box 3, a top plate 5 is arranged above the rubber cylinder 8, a limiting steel plate 7 is arranged below the rubber cylinder 8, the limiting steel plate 7 is fixedly connected to one end of the screw 2, the screw 2 passes through the rubber cylinder 8 and the top plate 5, a fastening nut is arranged on the upper side of the top plate 5, the deformation load is transferred to the rubber cylinder through the screw 2, and finally the deformation requirement is achieved.
[0005] However, in practical applications, the above device structure has the following technical defects:
[0006] 1. The strength of the part where the bolt head is welded to the limit steel plate is reduced. Because the bolt head is welded to the limit steel plate, the hexagonal bolt model usually used is M14, that is, the side length of the regular hexagon of the bolt head is 14mm. In such a small range, it must be welded very fully to weld it to the limit steel plate firmly. If the bolt is kept at high temperature for a long time, the cross-sectional area of the bolt will change and the force bearing capacity of the bolt will be reduced. In the later use process, the bolt is easy to break here.
[0007] 2. Bolts are vulnerable parts and are not easy to replace. As the core that connects multiple parts in series, they are in a high stress state for a long time. In the later use, they are at the top of the roadway. They are very easy to rust and break naturally after being exposed to the sun and rain. At the same time, according to the requirements of the "Technical Standards for Urban Bridge Maintenance", expansion joints need to be maintained regularly, mainly by loosening the nuts, opening the top steel plate, cleaning the debris deposited in the joints, and then covering the top steel plate and tightening the nuts. In this installation and removal process, it is also easy to cause problems such as thread slippage or breakage caused by rust. If you want to replace the bolts, because the bolt heads are placed in a sealed steel plate box, you can only remove the damaged bolts by cutting the top plate of the steel plate box, install the new bolts, and then weld the top plate of the cut steel plate box, which greatly damages the integrity of the structure.
[0008] 3. Due to the high temperature cutting and welding of the top plate, the rubber body may be damaged, which affects the elastic performance of the entire structure. In severe cases, a new rubber cylinder needs to be replaced, which increases the process and unnecessary costs. Utility Model Content
[0009] In view of the existing deficiencies, the utility model provides a detachable bridge expansion joint multi-directional deformation device, which can easily replace vulnerable components without destroying the integrity and durability of the original structure, with lower cost and faster construction period.
[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0011] A detachable multi-directional deformation device for a bridge expansion joint comprises a steel plate box and a base plate. The steel plate box is a cylindrical structure arranged on the base plate and fixedly connected to the base plate by welding. A screw is vertically arranged inside the steel plate box, a cylindrical rubber body is sleeved on the outside of the screw, a top plate is arranged on the upper side of the rubber body, and a bolt is assembled on the screw through a thread.
[0012] Furthermore, a first through hole is opened at the center of the top plate, the inner diameter of the first through hole is larger than the diameter of the screw, and the top plate can be sleeved on the screw through the first through hole.
[0013] Furthermore, a regular hexagonal limiting hole is opened at the center of the bottom plate, and one end of the nut on the screw rod is located in the limiting hole.
[0014] Furthermore, a second through hole is opened inside the rubber body, the inner diameter of the second through hole is larger than the diameter of the screw, and the rubber body is sleeved on the screw through the second through hole.
[0015] Furthermore, a plurality of limit teeth are formed at the edge of the top plate by cutting, and a plurality of groups of L-shaped limit slots are provided at the upper edge of the ring surface of the steel plate box. The specifications of the limit slots are matched with the specifications of the limit teeth, and the top plate is inserted into the limit slots by the limit teeth to form a detachable connection with the steel plate box.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] 1. The utility model adopts a detachable installation method, which simplifies the structure of the original device and enables the easily damaged components to be easily replaced without destroying the integrity and durability of the original structure, with lower costs and faster construction period.
[0018] 2. The utility model hollows out the body of the steel plate box, then screws in a top plate with limiting teeth, and then tightens the bolts with nuts to achieve structural fastening. This is a fully manual operation without the use of any electrical equipment, thus simplifying the replacement process and making it very easy to replace bolts or rubber bodies.
[0019] 3. By limiting the screws through the limiting holes opened on the bottom plate, the structure is lighter, the process is simplified, the cost is reduced, the durability of the bolts is guaranteed, the limiting steel plate in the original structure is eliminated, the amount of steel used is reduced, and the original cubic steel box is replaced by a cylindrical steel box, which ensures the structural strength while greatly reducing the amount of welding. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of a multi-directional deformation device for expansion joints in the prior art.
[0021] Figure 2 It is a schematic diagram of the overall structure of the utility model.
[0022] Figure 3 It is a schematic diagram of the disassembled structure of the utility model.
[0023] Figure 4 It is a cross-sectional view of the utility model.
[0024] Figure 5 It is a structural schematic diagram of the steel plate box and the top plate in the utility model.
[0025] Figure 6It is a schematic diagram of the installation structure of the device and the expansion joint tooth plate.
[0026] In the figure: 1, bolt; 2, screw; 3, steel plate box; 31, limit slot; 4, bottom plate; 41, limit hole; 5, top plate; 51, first through hole; 52, limit tooth; 6, rubber body; 61, second through hole, 7 limit steel plate, 8 rubber cylinder, 9 expansion joint tooth plate. DETAILED DESCRIPTION
[0027] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] Example:
[0029] like Figures 1 to 6 As shown, a detachable bridge expansion joint multi-directional deformation device includes a steel plate box 3 and a bottom plate 4. The steel plate box 3 is a cylindrical structure arranged on the bottom plate 4 and fixedly connected to the bottom plate 4 by welding. A screw rod 2 is vertically arranged inside the steel plate box 3, and a cylindrical rubber body 6 is sleeved on the outside of the screw rod 2. A top plate 5 is arranged on the upper side of the rubber body 6, and a bolt 1 is assembled on the screw rod 2 through a thread. This design solves the problem that the head of the bolt 1 of the expansion joint device is welded to the limiting steel plate in the prior art, and the strength is reduced. The bolt 1 is a wearing part and is not easy to replace. In addition, the rubber body 6 may be damaged by high-temperature cutting and welding of the top plate 5, which affects the elastic performance of the entire structure. In severe cases, a new rubber cylinder needs to be replaced, which increases the process and unnecessary costs.
[0030] A first through hole 51 is provided at the center of the top plate 5, and the inner diameter of the first through hole 51 is larger than the diameter of the screw 2. The top plate 5 can be sleeved on the screw 2 through the first through hole 51. The first through hole 51 is provided to facilitate sleeve placement of the top plate 5 on the screw 2, facilitate installation and removal of the top plate 5, and improve operational convenience.
[0031] A regular hexagonal limiting hole 41 is provided at the center of the bottom plate 4, and one end of the nut on the screw rod 2 is located in the limiting hole 41. The structure is lighter, the process is simplified, the cost is reduced, the durability of the bolt 1 is guaranteed, the limiting steel plate in the original structure is eliminated, and the amount of steel used is reduced.
[0032] A second through hole 61 is provided inside the rubber body 6, and the inner diameter of the second through hole 61 is larger than the diameter of the screw 2. The rubber body 6 is sleeved on the screw 2 through the second through hole 61. The second through hole 61 is provided to facilitate sleeve placement of the rubber body 6 on the screw 2, thereby facilitating installation and removal of the rubber body 6.
[0033] A plurality of limiting teeth 52 are formed by cutting at the edge of the top plate 5, and a plurality of groups of limiting slots 31 of L-shaped structure are provided at the upper edge of the annular surface of the steel plate box 3. The specifications of the limiting slots 31 match those of the limiting teeth 52, and the top plate 5 is connected to the steel plate box 3 in a detachable manner by inserting the limiting teeth 52 into the limiting slots 31. The design can limit and fix the top plate 5 through the setting of the limiting slots 31. During installation, the limiting teeth 52 at the edge of the top plate 5 can be inserted into the limiting slots 31, thereby ensuring the stability of the top plate 5 and preventing the top plate 5 from shifting in the upper and lower positions. At the same time, it is convenient to install and disassemble the top plate 5, thereby improving the convenience of operation.
[0034] The following data were obtained through experiments:
[0035]
[0036] From the cost point of view, for replacing 100 bolts 1, the labor cost after the improvement is only 500 / 6250=8% of the cost before the improvement. After the improvement, the equipment is fully operated manually, and the cost is zero. The material cost after the improvement is 2000 / 12000=16% of the cost before the improvement. After the improvement, the total cost required to replace 100 bolts 1 is only 2500 / 29500=8% of the cost before the improvement, and the economic benefits are very significant.
[0037] In terms of construction period, it took 12.5 days to replace 100 bolts before the improvement, but only 2 days after the improvement. The above improvements will greatly reduce the time of road occupation for maintenance, and the advantages are obvious in municipal overpasses, viaducts and other sections.
[0038] From a quality perspective, improving the destructive repair of structures to non-destructive repair will greatly improve the durability of components.
[0039] The working principle of this detachable bridge expansion joint multi-directional deformation device is as follows: in actual use, the steel plate box 3 is first transported to the site, and the lines are laid out and fixed as required, and concrete is poured. After completion, the top surface of the concrete is made flush with the top surface of the steel plate box 3, and the cylinder of the steel plate box 3 is anchored in the concrete. The screw 2 is placed inside the steel plate box 3, and one end of the nut on the screw 2 is located in the limiting hole 41 inside the bottom plate 4, and the screw 2 is limited by the limiting hole 41, and then the rubber body 6 is sleeved on the screw 2, and the top plate 5 is sleeved on the screw 2, and the limiting tooth 52 on the top plate 5 is inserted into the limiting groove 31 on the steel plate box 3 to limit the top plate 5. Figure 6 As shown, the external expansion joint tooth plate is sleeved on the screw rod 2 and fixed by bolts 1 to complete the installation.
[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.
Claims
1. A detachable bridge expansion joint multi-directional deformation device, comprising a steel plate box (3) and a bottom plate (4), characterized in that: The steel plate box (3) is a cylindrical structure arranged on a bottom plate (4) and fixedly connected to the bottom plate (4) by welding. A screw rod (2) is vertically arranged inside the steel plate box (3). A cylindrical rubber body (6) is sleeved on the outside of the screw rod (2). A top plate (5) is arranged on the upper side of the rubber body (6). A bolt (1) is threadedly assembled on the screw rod (2).
2. The detachable bridge expansion joint multi-directional deformation device according to claim 1 is characterized in that: A first through hole (51) is provided at the center of the top plate (5); the inner diameter of the first through hole (51) is greater than the diameter of the screw rod (2); and the top plate (5) can be sleeved on the screw rod (2) through the first through hole (51).
3. The detachable bridge expansion joint multi-directional deformation device according to claim 1 is characterized in that: A regular hexagonal limiting hole (41) is provided at the center of the bottom plate (4), and one end of the nut on the screw rod (2) is located in the limiting hole (41).
4. The detachable bridge expansion joint multi-directional deformation device according to claim 1 is characterized in that: A second through hole (61) is provided inside the rubber body (6), the inner diameter of the second through hole (61) is greater than the diameter of the screw rod (2), and the rubber body (6) is sleeved on the screw rod (2) through the second through hole (61).
5. The detachable bridge expansion joint multi-directional deformation device according to claim 1 is characterized in that: A plurality of limiting teeth (52) are formed at the edge of the top plate (5) by cutting, and a plurality of groups of limiting grooves (31) with L-shaped structures are provided at the upper edge of the annular surface of the steel plate box (3). The specifications of the limiting grooves (31) are compatible with the specifications of the limiting teeth (52), and the top plate (5) is detachably connected to the steel plate box (3) by snapping the limiting teeth (52) into the limiting grooves (31).