Pre-bending pushing type bridge structure limiting device

Abstract

The invention discloses a pre-bending pushing type bridge structure limiting device which is specifically characterized in that a square steel plate is installed on a concrete check block, two rectangular steel plates are welded to the square steel plate to form a pi shape, a narrow steel plate is welded between the two rectangular steel plates, and two small steel plates are welded to the upper surface of each narrow steel plate to form a gap; a clamping groove steel plate is placed in the gap, and five pre-bent steel bars are welded to the clamping groove steel plate. Two rectangular steel plates are embedded in a main beam, wear-resistant rubber blocks are adhered to the inner sides of the rectangular steel plates, two semi-Y-shaped steel plates are welded to form a semi-Y-shaped pushing body through two rectangular connecting steel plates and an arc-shaped steel plate, and the straight end of the semi-Y-shaped pushing body is inserted into a gap formed by the wear-resistant rubber blocks. The arc-shaped edge of the semi-Y-shaped pushing body corresponds to the arc-shaped edge of the pre-bent steel bar in position. Through reciprocating friction between the wear-resisting rubber block and the pushing body, the pre-bending steel bar continuously deforms, and the main beam is partially jacked to overcome the gravity of the main beam to do work so as to consume external energy, so that the aim of staged fortification and disaster resistance is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge seismic resistance and seismic isolation, and in particular relates to a pre-bent top-pushing type bridge structure limiting device. Background Art

[0002] Every year, engineering accidents that cause structural damage and failure, and loss of life and property due to natural disasters such as earthquakes and typhoons are common. Structural failure not only leads to a significant increase in the cost of structural repair, but may also cause secondary disasters, affecting post-disaster reconstruction in disaster areas. When encountering extreme loads such as rare earthquakes and typhoons, coupled with unreasonable design of bridge structure limit protection measures, bridge structures are prone to beam falling accidents and serious damage to blocks. As people's research on natural disasters and structural responses continues to deepen, they also pay great attention to the research and development of structural limit measures and seismic isolation devices in building structures. How to cleverly integrate multiple functions and reasonably optimize existing limit measures or seismic isolation devices has continued to receive the focus of attention of engineers in the field of civil engineering disaster prevention and mitigation in recent years.

[0003] In order to avoid or reduce the risk of falling beams in bridge structures, concrete blocks are usually designed at both ends of the bridge cap beams, and some buffering, energy-absorbing, and position-limiting devices are set up using the transverse gap between the concrete blocks and the main beams. The applicant has reviewed existing literature and related patents in the field of disaster prevention and mitigation and found that the vast majority of existing bridge position-limiting devices have relatively simple functions and have not yet effectively integrated multiple beneficial functions. This results in a relatively large space required to implement multiple functions, a bulky device, numerous and costly components, and difficulty in replacing or repairing damaged components, requiring high manufacturing and processing precision. Summary of the Invention

[0004] In order to effectively resist the extreme loads of natural disasters and reduce engineering accidents such as falling beams of bridge structures, the limiting function, buffering energy consumption and structural self-resetting are effectively integrated to enable a device to realize graded function, simple post-disaster reset operation, easy manufacturing and processing, short construction period, easy replacement and repair of components and low price. Therefore, the present invention aims to provide a pre-bent top-pushing bridge structure limiting device, which can achieve under normal use loads and small and medium earthquakes, mainly rely on the arc steel plate of the semi-Y-shaped pusher to contact with the pre-bent steel bar and push the semi-Y-shaped pusher to rub against the wear-resistant rubber block to dissipate external energy; under strong earthquakes or strong winds, mainly rely on the arc steel plate of the semi-Y-shaped pusher to contact with the pre-bent steel bar and reciprocate to drive the pre-bent steel bar to deform, partially lift the main beam to overcome the main beam gravity to do work to dissipate external energy, so as to achieve graded defense to limit the displacement of the main beam and thus avoid or reduce the accident of falling beams.

[0005] The present invention provides a pre-bent, top-pushing bridge structure limiting device, comprising a cap beam, a main beam, a concrete block, and a support. A square steel plate is bolted to the concrete block on the side of the main beam, two rectangular steel plates are welded to the square steel plate to form a π shape, a narrow steel plate is welded between the two rectangular steel plates, slightly above the center of the main beam edge, two small steel plates are welded to the upper surfaces of each end of the narrow steel plate, with a certain gap left and flush with the rectangular steel plate, and five pre-bent steel bars, one end of which is pre-bent and the other end is straight, are welded to a slot steel plate flush with the rectangular steel plate. The slot steel plate is placed in the gap formed by the small steel plates. Two rectangular steel plates welded with short steel bars are embedded in the main beam, wear-resistant rubber blocks are pasted on the inner side of the rectangular steel plates, and two semi-Y-shaped steel plates with curved surfaces are connected by two rectangular steel plates and one curved steel plate through welding to form a semi-Y-shaped pushing body. The straight end of the semi-Y-shaped pushing body is inserted into the gap formed by the two wear-resistant rubber blocks, and the curved edge of the semi-Y-shaped pushing body corresponds to the position of the curved edge of the pre-bent steel bar.

[0006] Furthermore, the upper and lower horizontal rectangular connecting steel plates of the semi-Y-shaped pusher are flush with the top surface of the semi-Y-shaped steel plate and fit tightly with the wear-resistant rubber block.

[0007] Furthermore, a certain gap is left between the semi-Y-shaped pushing body and the main beam on the side close to the concrete block.

[0008] Furthermore, a certain gap is left between the arc-shaped edge of the semi-Y-shaped pushing body and the pre-bent steel bar.

[0009] Furthermore, the width of the narrow steel plate is one sixth of the length of the narrow steel plate.

[0010] Furthermore, the thickness of the slot steel plate is smaller than the gap formed by the two small steel plates to ensure that it can be smoothly inserted into the gap formed by the two small steel plates.

[0011] Furthermore, the outer surface of the pre-bent steel bar is covered with a rubber sheath.

[0012] Furthermore, the angle between the bent portion of the pre-bent steel bar and its straight portion is 135°.

[0013] The beneficial technical effects of the present invention compared with the prior art are:

[0014] 1) The present invention is provided with a wear-resistant rubber block, a semi-Y-shaped pushing body, and a pre-bent steel bar. The wear-resistant rubber block and the steel plate of the semi-Y-shaped pushing body are rubbed back and forth, the semi-Y-shaped pushing body pushes the pre-bent steel bar to continuously bend and deform, and the pre-bent steel bar contacts and lifts the main beam with the semi-Y-shaped pushing body to achieve limiting and energy consumption. In this way, the beneficial effect of integrating the buffering energy consumption and limiting functions is achieved.

[0015] 2) Since a certain gap is left between the semi-Y-shaped pushing body and the pre-bent steel bar in the present invention, under normal use loads and the action of small and medium earthquakes, when the lateral displacement of the main beam is relatively small, the main beam swings left and right but will not cause the semi-Y-shaped pushing body to move along the wear-resistant rubber block, and the semi-Y-shaped pushing body will not contact the web of the main beam and the pre-bent steel bar, that is, the normal lateral displacement of the main beam will not be affected; when the lateral displacement of the main beam increases to a certain extent, the left and right swing of the main beam will cause the semi-Y-shaped pushing body to contact the pre-bent steel bar and push the semi-Y-shaped pushing body to move along the wear-resistant rubber block, but the deformation of the pre-bent steel bar is small in this process, and the external energy is mainly dissipated by friction between the semi-Y-shaped pushing body and the wear-resistant rubber block.

[0016] 3) Under rare loads such as strong earthquakes or strong winds, the lateral displacement of the main beam of the present invention can easily exceed the design value. The left-right swing of the main beam at this time will directly cause the semi-Y-shaped pusher to contact and collide with the main beam web and pre-bent steel bars, causing significant bending deformation of the pre-bent steel bars. This process mainly relies on the bending deformation of the pre-bent steel bars and the friction between the rubber sheath of the pre-bent steel bars and the curved steel plate of the semi-Y-shaped pusher (primarily), and the contact between the semi-Y-shaped pusher and the pre-bent steel bars to lift the main beam and overcome the main beam's gravity (supplementary) to dissipate external energy. Thus, the present invention achieves multiple functions of multiple defenses and lateral limit.

[0017] 4) All materials used in the present invention are relatively conventional and easy to obtain in engineering construction. Component replacement is easy to operate, and the required cost is relatively low. The layout space requirement is relatively easy to meet. Therefore, the present invention has good market promotion and application prospects and good social and economic benefits.

[0018] 5) The present invention can be adjusted by changing the relevant geometric parameters of each component of the device, and through reasonable calculations and limited experiments, it can meet the limiting requirements of different bridge structures. At the same time, the present invention can also be used as a buffer energy dissipation and limiting device for other structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural reference diagram of the pre-bent top-pushing bridge structure limiting device of the present invention.

[0020] Figure 2 It is a plan and elevation diagram of a semi-Y-shaped propulsion body and its components.

[0021] Figure 3 This is a schematic diagram of the plan and elevation of the slotted steel plate and pre-bent steel bars.

[0022] Figure 4 It is a schematic diagram of the plane and elevation of rectangular steel plates, wear-resistant rubber blocks, and short steel bars.

[0023] Figure 5 It is a schematic diagram of rectangular steel plate, small steel plate, square steel plate, narrow steel plate, bolt plane and elevation.

[0024] In the figure: 1-cap beam; 2-main beam; 3-support; 4-concrete block; 5-rectangular steel plate; 6-square steel plate; 7-bolt; 8-small steel plate; 9-narrow steel plate; 10-pre-bent steel bar; 11-arc steel plate; 12-rectangular connecting steel plate; 13-semi-Y-shaped steel plate; 14-wear-resistant rubber block; 15-rectangular steel plate; 16-short steel bar; 17-slot steel plate. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] The present invention proposes a pre-bent jacking type bridge structure limiting device which mainly relies on the contact between the curved steel plate of the semi-Y-shaped pushing body and the pre-bent steel bars and the friction between the semi-Y-shaped pushing body and the wear-resistant rubber block to dissipate external energy under normal use loads and small and medium earthquakes. Under the action of strong earthquakes or strong winds, the pre-bent steel bars are mainly dissipated by the contact between the curved steel plate of the semi-Y-shaped pushing body and the pre-bent steel bars and the reciprocating drive to deform the pre-bent steel bars and partially lift the main beam to overcome the gravity of the main beam to do work, so as to achieve graded defense to limit the displacement of the main beam and thus avoid or reduce the accident of falling beams.

[0027] A pre-bending top-pushing bridge structure limiting device of the present invention is as follows Figure 1 As shown, it includes a cap beam 1, a main beam 2, a concrete block 4 and a support 3. A square steel plate 6 is installed by bolts 7 on the concrete block 4 near the main beam 2. Figure 5 As shown, two rectangular steel plates 5 are welded on the square steel plate 6 to form a π shape, a narrow steel plate 9 is welded between the two rectangular steel plates 5, and a narrow steel plate 9 is welded to the upper center of the main beam edge. Two small steel plates 8 are welded on the upper surface of each end of the narrow steel plate, leaving a certain gap and flush with the rectangular steel plate 5. Figure 3 As shown, five pre-bent steel bars 10 with one end pre-bent and the other end straight are welded on a slot steel plate 17 flush with the rectangular steel plate 5, and the slot steel plate 17 is placed in the gap formed by the small steel plate 8. Two rectangular steel plates 15 with short steel bars 16 welded on them are embedded in the main beam, and wear-resistant rubber blocks 14 are pasted on the inner side of the rectangular steel plates 15, as shown in FIG. Figure 4 As shown. Figure 2 As shown, two semi-Y-shaped steel plates 13 with curved surfaces are welded together using two rectangular connecting steel plates 12 and a curved steel plate 11 to form a semi-Y-shaped pushing body, and the straight end of the semi-Y-shaped pushing body is inserted into the gap formed by two wear-resistant rubber blocks 14. The curved edge of the semi-Y-shaped pushing body corresponds to the position of the curved edge of the pre-bent steel bar 10.

[0028] Furthermore, the upper and lower horizontal rectangular connecting steel plates 12 of the semi-Y-shaped pusher are flush with the top surface of the semi-Y-shaped steel plate 13 and fit tightly with the wear-resistant rubber block 14 .

[0029] Furthermore, a certain gap is left between the semi-Y-shaped pushing body and the main beam 2 on the side of the concrete stopper 4, so as to give full play to the friction energy dissipation function of the semi-Y-shaped pushing body and the wear-resistant rubber block 14.

[0030] Furthermore, a certain gap is left between the arc-shaped edge of the semi-Y-shaped pusher and the pre-bent steel bar 10 to ensure that the device does not affect the normal lateral displacement of the main beam 2 when normal load is applied.

[0031] Furthermore, the width of the narrow steel plate 9 is one sixth of the length of the narrow steel plate 9 , and mainly plays the role of restricting the movement of the slot steel plate 17 .

[0032] Furthermore, the thickness of the slot steel plate 17 is smaller than the gap formed by the two small steel plates 8 to ensure that it can be smoothly inserted into the gap formed by the two small steel plates 8.

[0033] Furthermore, the outer surface of the pre-bent steel bar 10 is covered with a rubber sheath to reduce the noise generated when the semi-Y-shaped pushing body contacts or collides with it.

[0034] Furthermore, the angle between the bent portion and the straight portion of the pre-bent steel bar 10 is approximately 135°.

[0035] According to the design requirements of the bridge structure's earthquake resistance, the factory pre-customized bolts 7, rectangular steel plates 5, slotted steel plates 17, pre-bent steel bars 10, short steel bars 16, small steel plates 8, semi-Y-shaped steel plates 13, square steel plates 6, narrow steel plates 9, rectangular steel plates 15, wear-resistant rubber blocks 14, rectangular connecting steel plates 12, and curved steel plates 11 were cut and processed as shown in the figure. The rectangular steel plates 5, square steel plates 6, small steel plates 8, and narrow steel plates 9 were then welded together to form an integral steel frame structure with slots as shown in the figure. The rectangular steel plates 5, semi-Y-shaped steel plates 13, rectangular connecting steel plates 12, and curved steel plates 11 were then combined to form a semi-Y-shaped pusher 18 as shown in the figure. Bolts 7 were used to install the integral steel frame structure on the side of the concrete block 4 near the main beam 2. The slotted steel plates 17 were then inserted into the slots of the integral steel frame structure, and pre-bent steel bars were welded to the slotted steel plates 17 and covered with rubber covers. During the construction of the main beam 2, two rectangular steel plates 15 welded with short steel bars 16 are embedded and wear-resistant rubber blocks 14 are pasted on the inner side of the rectangular steel plates 15. Then, the straight section of the semi-Y-shaped pusher 18 is inserted into the gap formed by the two wear-resistant rubber blocks 14, and a gap is left between the arc edge of the semi-Y-shaped pusher 18 and the pre-bent steel bars 10, thus forming a pre-bent top-pushing bridge structure limiting device. The present invention adopts a multi-level defense concept, with a clear and effective force transmission path, less consumables, and a low cost. A better solution can be obtained through reasonable calculation analysis and limited experiments, thereby realizing the effective integration of functions such as buffering energy consumption and structural limiting, reducing the occurrence of beam falling accidents and improving the overall disaster resistance of the bridge structure.

[0036] In other specific embodiments, the gap between the semi-Y-shaped pusher and the main beam web in this embodiment can also be provided with a spring or the like to enhance the limiting and energy dissipation function. The pre-bent steel bars, semi-Y-shaped pusher, and spring used can also be of other forms and are not limited to the shapes, forms, and connection types of this embodiment. The present invention can also be applied to buffering and limiting devices in various structures.

[0037] The application of the pre-bent top-pushing bridge structure limiting device of this embodiment is as follows:

[0038] Under normal service load, when the lateral displacement of the main beam is relatively small, the main beam swings left and right but does not cause the semi-Y-shaped pushing body to move along the wear-resistant rubber block, and the semi-Y-shaped pushing body does not contact the main beam web or pre-bent steel bars, that is, the normal lateral displacement of the main beam is not affected.

[0039] Under the action of small and medium earthquakes, when the lateral displacement of the main beam increases to a certain extent, the left and right swing of the main beam will cause the semi-Y-shaped pushing body to come into contact with the pre-bent steel bars and push the semi-Y-shaped pushing body to move along the wear-resistant rubber block. However, the deformation of the pre-bent steel bars is small during this process, and the external energy is mainly dissipated by friction between the semi-Y-shaped pushing body and the wear-resistant rubber block.

[0040] Under rare loads such as strong earthquakes or high winds, the lateral displacement of the main beam exceeds the design value, causing it to swing significantly. This directly causes the semi-Y-shaped pusher to contact and collide with the main beam web and pre-bent steel bars, causing the pre-bent steel bars to significantly bend and deform. Simultaneously, the pre-bent steel bars' rubber sheaths rub back and forth against the curved steel plates of the semi-Y-shaped pusher, primarily dissipating external energy. However, during this process, the semi-Y-shaped pusher also contacts the pre-bent steel bars, lifting the main beam and causing a smaller vertical displacement. This overcomes the main beam's gravity and performs work to dissipate some external energy. This device achieves the beneficial effect of integrating buffering and limiting functions.

[0041] The above description is only a preferred embodiment of the present invention. For those skilled in the art, without departing from the inventive concept of the present invention, several variations and improvements can be made without creative work, and these all fall within the scope of protection of the present invention.

Claims

1. A pre-bent top-pushing bridge structure limiting device, comprising a cap beam (1), a main beam (2), a concrete block (4) and a support (3), characterized in that: A square steel plate (6) is installed on the side of the concrete block (4) close to the main beam (2) by bolts (7), two rectangular steel plates (5) are welded on the square steel plate (6) to form a π shape, a narrow steel plate (9) is welded between the two rectangular steel plates (5) at a position slightly above the center of the main beam edge, two small steel plates (8) with a certain gap and flush with the rectangular steel plate (5) are welded on the upper surface of each end of the narrow steel plate, five pre-bent steel bars (10) with one end pre-bent and the other end straight are welded on a slot steel plate (17) flush with the rectangular steel plate (5), and the slot is fixed. The steel plate (17) is placed in the gap formed by the small steel plate (8); two rectangular steel plates (15) welded with short steel bars (16) are embedded in the main beam, and wear-resistant rubber blocks (14) are pasted on the inner side of the rectangular steel plates (15). Two semi-Y-shaped steel plates (13) with curved surfaces are welded to two rectangular connecting steel plates (12) and an arcuate steel plate (11) to form a semi-Y-shaped pusher. The straight end of the semi-Y-shaped pusher is inserted into the gap formed by the two wear-resistant rubber blocks (14), and the arc side of the semi-Y-shaped pusher corresponds to the position of the arc side of the pre-bent steel bar (10).

2. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized in that: The upper and lower horizontal rectangular connecting steel plates (12) of the semi-Y-shaped pusher are flush with the top surface of the semi-Y-shaped steel plate (13) and are tightly fitted with the wear-resistant rubber block (14).

3. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized in that: A certain gap is left between the semi-Y-shaped pushing body and the main beam (2) on the side close to the concrete stopper (4).

4. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized in that: A certain gap is left between the arc-shaped edge of the semi-Y-shaped pushing body and the pre-bent steel bar (10).

5. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized in that: The width of the narrow steel plate (9) is one sixth of the length of the narrow steel plate (9).

6. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized by: The thickness of the slot steel plate (17) is smaller than the gap formed by the two small steel plates (8), so as to ensure that it can be smoothly inserted into the gap formed by the two small steel plates (8).

7. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized by: The outer surface of the pre-bent steel bar (10) is covered with a rubber sheath.

8. The pre-bending top-pushing bridge structure limiting device according to claim 1 is characterized by: The angle between the bent portion of the pre-bent steel bar (10) and its straight section is 135°.

Images