Replaceable small and medium-sized cross-border bridge transverse stop block with memory alloy steel bars

Abstract

The utility model discloses a replaceable small and medium-sized cross-border bridge transverse stopper with memory alloy steel bars, a bridge girder is arranged on the upper end face of a girder supporting block, the replaceable small and medium-sized cross-border bridge transverse stopper comprises a bridge transverse stopper body, and the bridge transverse stopper body is arranged on the upper end face of a bridge cover beam on one side of the bridge girder. The bridge transverse stop block is connected with a bridge cover beam through a connecting pull rod, and a buffering rubber pad matched with a bridge girder is arranged on the side wall, close to the bridge girder, of the bridge transverse stop block. The connecting pull rod is installed in the bridge cover beam and the bridge transverse check block in a penetrating mode, the lower end of the connecting pull rod penetrates out of the lower end face of the bridge cover beam and then is connected with a lower fastener, and the upper end of the connecting pull rod penetrates out of the upper end face of the bridge transverse check block and then is connected with an upper fastener. Due to the fact that the shape memory alloy steel bars are tensioned without professional anchorage devices and pedestals, the problem that traditional prestressed steel bars are difficult to tension on a bridge cover beam is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge device technical field especially, it relates to a replaceable small cross -border bridge transverse stopper with memory alloy reinforcement. BACKGROUND

[0002] With the rapid development of China's transportation, the assembled continuous composite beam bridge as the common type in small and medium span beam bridge plays an extremely important role in China's road transportation system, the bridge generally adopts the plate type rubber support, and the beam body is directly placed on the support, and the plate is directly placed in the middle of the upper and lower structures Rubber support does not take any anchoring measures, and sets up reinforced concrete transverse stopper on the bent cap, which constitutes the upper structure seismic system together. The bridge earthquake damage shows that it is difficult to limit the sliding of the beam body in the earthquake by only relying on the above-mentioned seismic measures. Therefore, small and medium span beam bridges at home and abroad are generally damaged after the earthquake. Therefore, it is extremely important to take more reasonable and effective seismic fortification measures for such bridges.

[0003] In the current bridge design field, there is generally such a situation: the collision effect between the main beam and the stopper is not usually considered, and the seismic stopper is only regarded as a kind of construction measure, and the design is carried out according to the construction requirements. Moreover, there is no specific provision in the existing specification to guide the design details of the new type of seismic stopper.

[0004] In the shaking table test that has been carried out, it is also found that when the beam falls phenomenon of the bridge occurs, it is often because the stopper cannot complete the effective energy dissipation effect, and directly breaks, so as to cannot play the effective seismic performance, which seriously affects the rescue and reconstruction work after the earthquake.

[0005] At present, the stopper connected with the bent cap will cause damage to the bent cap to some extent after the earthquake, the repair cost of the damaged stopper is high, and the strength of the stopper after secondary pouring repair is lower than that of the original piece. SUMMARY

[0006] The utility model discloses a kind of replaceable small cross -border bridge transverse stopper with memory alloy reinforcement for solving the problem that the strength of stopper does not meet the need of anti-seismic due to the lack of specification to guide the design details of bridge stopper, and the problem that the strength of stopper concrete is reduced due to secondary pouring after damage;In addition, the basic function of bridge stopper is also missing after earthquake, which can affect post-earthquake rescue, and the utility model can also solve such problems.The technical scheme adopted by the utility model is as follows:

[0007] A replaceable small and medium cross-border bridge transverse block with shape memory alloy steel bars, the upper end surface of the bridge cap beam is provided with a girder support block, the upper end surface of the girder support block is provided with a bridge girder, comprising a bridge transverse block, the bridge transverse block is arranged on the upper end surface of the bridge cap beam on one side of the bridge girder, the bridge transverse block is connected with the bridge cap beam through a connecting pull rod, and the side wall of the bridge transverse block close to the bridge girder is provided with a buffer rubber pad matched with the bridge girder.

[0008] As preferred, the connecting pull rod is arranged in the bridge cap beam and the bridge transverse block, the lower end of the connecting pull rod is connected with a lower fastener after being arranged out of the lower end surface of the bridge cap beam, and the upper end of the connecting pull rod is connected with an upper fastener after being arranged out of the upper end surface of the bridge transverse block.

[0009] As preferred, the connecting pull rod is a shape memory alloy steel bar.

[0010] As preferred, a shear connecting key is arranged between the bridge cap beam and the bridge transverse block, the lower end of the shear connecting key is arranged into the upper end surface of the bridge cap beam, and the upper end of the shear connecting key is arranged into the lower end surface of the bridge transverse block.

[0011] As preferred, a friction buffer layer is further arranged between the bridge transverse block and the bridge cap beam.

[0012] As preferred, stirrups and shear longitudinal bars are arranged in the bridge transverse block, and the stirrups and the shear longitudinal bars are arranged alternately.

[0013] As preferred, a block weak layer is arranged in the inner cavity of the bridge transverse block close to the lower end surface, and the block weak layer is a concrete layer without the stirrups.

[0014] As preferred, a girder buffer pad is arranged between the bridge girder and the girder support block.

[0015] As preferred, cap beam transverse bars and cap beam longitudinal bars are further arranged in the bridge cap beam, and the cap beam transverse bars and the cap beam longitudinal bars are arranged alternately.

[0016] As preferred, inverted U-shaped steel bars are arranged in the side wall of the bridge transverse block close to the bridge girder, and the lower end of the inverted U-shaped steel bars is connected with the bridge cap beam.

[0017] The bridge transverse block with the shape memory alloy steel bars has the beneficial effects that:

[0018] The bridge transverse block with the shape memory alloy steel bars has the beneficial effects that:

[0019] The utility model meets the requirement of current standard two level, under small earthquake, the bridge is in elastic state by strength design, under big earthquake, the bridge has enough deformation ability to meet the performance goal of not collapsing by ductility design.

[0020] The utility model discloses bridge lateral stopper has prestress, effectively improve the bearing capacity, ductility and the effect of fatigue resistance of bridge lateral stopper, thereby greatly improve the limiting energy absorption effect of bridge lateral stopper, prevent and treat the beam falling of bridge in the earthquake.

[0021] The shape memory alloy reinforcing steel bar can be recycled, and after secondary pouring and repairing of the bridge lateral stopper, prestress can be applied according to the characteristics of the shape memory alloy reinforcing steel bar, so that the strength of the repaired concrete is still relatively high.

[0022] The utility model discloses bridge lateral stopper upper portion generates crack after absorbing the energy generated by earthquake, and the shape memory alloy reinforcing steel bar has the ability of recovery, also makes bridge lateral stopper have self-resetting ability, and the width of crack can be reduced by heating the shape memory alloy reinforcing steel bar, and the existence of the repaired bridge lateral stopper can still make energy reserve for absorbing aftershock, can guarantee the function after the earthquake, and guarantee the timely arrival of post-disaster materials. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is structural schematic diagram of the utility model embodiment one;

[0024] Figure 2 It is the A enlarged view in Figure 1

[0025] Figure 3 It is working state schematic diagram of the utility model;

[0026] In the drawing: 1 - lower fastener, 2 - bridge bent cap, 3 - connecting pull rod, 4 - friction buffer layer, 5 - shear connecting key, 6 - stop block weak layer, 7 - bridge lateral stop block, 8 - stirrup, 9 - shear longitudinal reinforcement, 10 - upper fastener, 11 - buffer rubber pad, 12 - bridge girder, 13 - girder buffer pad, 14 - girder support block. DETAILED DESCRIPTION

[0027] The utility model is further described below in connection with the drawings.

[0028] Referring to Figures 1-3 ​The utility model provides a replaceable small and medium cross-border bridge transverse stopper with memory alloy reinforcement, the upper end surface of bridge cap beam 2 is equipped with girder support block 14, the upper end surface of girder support block 14 is equipped with bridge girder 12, including bridge transverse stopper 7, bridge transverse stopper 7 is arranged on the upper end surface of bridge cap beam 2 on one side of bridge girder 12, bridge transverse stopper 7 is connected with bridge cap beam 2 through connecting pull rod 3, the side wall of bridge transverse stopper 7 near bridge girder 12 is equipped with the buffer rubber pad 11 matched with bridge girder 12.

[0029] Connecting pull rod 3 is worn in bridge cap beam 2 and bridge transverse stopper 7, and the lower end of connecting pull rod 3 is connected with lower fastener 1 after being worn out from the lower end surface of bridge cap beam 2, and the upper end of connecting pull rod 3 is connected with upper fastener 10 after being worn out from the upper end surface of bridge transverse stopper 7. Connecting pull rod 3 is shape memory alloy reinforcement, and Fe-SAM iron-based memory alloy reinforcement is used for shape memory alloy reinforcement. The Fe-SAM iron-based memory alloy reinforcement completes the reverse transformation of martensite at 160 DEG C and generates a recovery force of 440 MPa. By setting the shape memory alloy reinforcement, the ductility of the bridge transverse stopper 7 is improved, and the energy absorption capacity and self-resetting capacity of the bridge transverse stopper 7 are increased.

[0030] The shape memory alloy reinforcement is precast and lengthened to a suitable length in a factory, and the pre-embedded shape memory alloy reinforcement is first poured and solidified, and then heated to generate a recovery stress, so that the purpose of applying a prestress to the bridge transverse stopper 7 is achieved. Through the characteristics of the shape memory alloy reinforcement, the shape memory alloy reinforcement is first poured and solidified, and then heated to generate a recovery stress after the concrete strength reaches 75%, so that the purpose of applying a prestress to the bridge transverse stopper 7 is achieved.

[0031] The shape memory alloy reinforcement is left on the upper and lower end surfaces of the bridge transverse stopper 7, which is convenient for electric heating.

[0032] Shear connecting key 5 is arranged between bridge cap beam 2 and bridge transverse stopper 7, the lower end of shear connecting key 5 is worn into the upper end surface of bridge cap beam 2, and the upper end of shear connecting key 5 is worn into the lower end surface of bridge transverse stopper 7. The shear connecting key 5 is provided, and the shear connecting key 5 is inverted U-shaped structure and has large shear capacity.

[0033] Friction buffer layer 4 is further arranged between bridge transverse stopper 7 and bridge cap beam 2, the friction is increased, so that the energy dissipation is better, and the energy dissipation capacity of bridge transverse stopper 7 is enhanced.

[0034] The bridge transverse block 7 is provided with stirrups 8 and shear longitudinal reinforcement 9, the stirrups 8 and shear longitudinal reinforcement 9 are staggered, and the concrete is poured on the frame formed by the shear reinforcement and the stirrups 8, which can effectively improve the ductility of the bridge transverse block 7.

[0035] The bridge transverse block 7 is provided with a block weak layer 6 in the inner cavity close to the lower end face, the block weak layer 6 is a concrete layer without stirrups 8, there is no stirrup 8 here, only the connecting pull rod 3 (shape memory alloy steel bar) as longitudinal reinforcement connects the upper and lower parts of the bridge transverse block 7, and the connecting pull rod 3 and the concrete layer provide the main pulling force.

[0036] The main beam buffer pad 13 is arranged between the bridge main beam 12 and the main beam support block 14, and the main beam buffer pad 13 is arranged to absorb the energy generated by the relative movement of the bridge main beam 12 and the main beam support block 14.

[0037] The initial gap between the bridge transverse block 7 and the bridge main beam 12 is preferably about 0.06m, the height of the bridge transverse block 7 can be 0.50-0.65m, the thickness of the bridge transverse block 7 is 0.48-0.58m, and the reasonable spacing of the bridge transverse block 7 is selected in the range of 1.0-2.5t (rubber layer thickness); the strength of the bridge transverse block 7 is controlled to be 20%-30% of the constant load reaction of each pier support.

[0038] Specific construction method:

[0039] First, bind the shear connecting key 5 and the connecting pull rod 3, and place the steel reinforcement cage in the specified position, mainly paying attention to the position of the shape memory alloy steel bar.

[0040] First, pour the bridge bent cap 2, and pay attention to fix it with a clamp to prevent deformation of the shape memory alloy steel bar during pouring; the shape memory alloy steel bar also needs to be extended by a certain length during pouring to facilitate subsequent heating and prestress application.

[0041] After waiting for the bridge bent cap 2 to solidify by 50%, the steel reinforcement cage of the bridge transverse block 7 is poured again, and a block weak layer 6 is left in the middle of the bridge transverse block 7 and the bridge bent cap 2, and early strength agent can be added in the pouring of the upper bridge transverse block 7 to make the strength of the upper and lower concrete blocks reach 75% at the same time, and the block weak layer 6 can also be artificially manufactured by twice pouring, so that the bridge transverse block 7 can shear along the block weak layer 6 when an earthquake occurs.

[0042] After the strength of the bridge lateral stopper 7 reaches 75%, then the shape memory alloy steel bars are heated in batches or one by one by using the electric heating method, and after the shape memory alloy steel bars reach the specified temperature, the shape memory alloy steel bars generate one-way shape memory effect, so that the length of the shape memory alloy steel bars has the tendency to shrink to the initial shape of the alloy bars, and then the concrete generates certain constraint reaction force, thereby generating prestress.

[0043] After the top concrete reaches the design strength, the buffer rubber pad 11 is installed on the inner side of the side surface of the bridge lateral stopper 7, and the distance between the bridge lateral stopper 7 and the bridge main beam 12 is ensured to be 1.0-2.5 times the thickness of the rubber layer of the plate rubber support.

[0044] Before installation, the surface of the bridge bent cap 2 is chiseled at the bottom of the bridge lateral stopper 7 to form a friction buffer layer 4, so as to increase the friction and enhance the energy dissipation capacity of the bridge lateral stopper 7.

[0045] The utility model discloses a shape memory alloy steel bar is set up, and the tension of the shape memory alloy steel bar does not need professional anchor and pedestal, and the operation difficulty of the traditional prestressed steel bar in the bridge bent cap 2 is solved.

[0046] The utility model discloses meet the requirement of two water levels of the current specification, and the bridge is in the elastic state under the small earthquake by using the strength design, and the bridge has enough deformation capacity to meet the performance target of not collapsing under the big earthquake through the ductility design.

[0047] The utility model discloses that the bridge lateral stopper 7 is applied with prestress, and the bearing capacity, ductility and fatigue resistance of the bridge lateral stopper 7 are effectively improved, thereby greatly improving the limiting energy absorption effect of the bridge lateral stopper 7 and preventing the falling of the bridge in the earthquake.

[0048] The shape memory alloy steel bar of the utility model can be recycled, and after the bridge lateral stopper 7 is repaired by pouring again, the shape memory alloy steel bar can still be used to apply prestress according to the characteristics of the shape memory alloy steel bar, so that the strength of the repaired concrete is still relatively high.

[0049] The implementation of the utility model discloses that the upper part of the bridge lateral stopper 7 generates cracks after absorbing the energy generated by the earthquake, the shape memory alloy steel bar has the recovery capacity, and the bridge lateral stopper 7 also has the self-resetting capacity, the width of the cracks can be reduced by heating the shape memory alloy steel bar, and the repaired bridge lateral stopper 7 can still store energy for absorbing aftershocks, so that the function of the bridge lateral stopper 7 can be ensured after the earthquake, and the timely arrival of post-disaster materials can be ensured.

[0050] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced equivalently, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel reinforcement, wherein a main beam support block is provided on the upper end face of the bridge cap beam, and a bridge main beam is provided on the upper end face of the main beam support block, characterized in that, The system includes a transverse bridge stop, which is located on the upper end face of the bridge cap beam on one side of the main beam of the bridge. The transverse bridge stop is connected to the bridge cap beam by a connecting rod. The side wall of the transverse bridge stop near the main beam of the bridge is provided with a buffer rubber pad that matches the main beam of the bridge.

2. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 1, characterized in that, The connecting rod is installed in the bridge cap beam and the bridge transverse block. The lower end of the connecting rod passes through the lower end face of the bridge cap beam and is connected to a lower fastener. The upper end of the connecting rod passes through the upper end face of the bridge transverse block and is connected to an upper fastener.

3. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 1, characterized in that, The connecting rod is a shape memory alloy steel bar.

4. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 1, characterized in that, A shear connection key is provided between the bridge cap beam and the bridge transverse stop block. The lower end of the shear connection key is inserted into the upper end face of the bridge cap beam, and the upper end of the shear connection key is inserted into the lower end face of the bridge transverse stop block.

5. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to any one of claims 1 to 4, characterized in that, A friction buffer layer is also provided between the transverse blocks of the bridge and the bridge cap beam.

6. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 5, characterized in that, The transverse blocks of the bridge are provided with stirrups and shear reinforcement bars, which are arranged alternately.

7. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 6, characterized in that, The bridge transverse block has a weak layer in its inner cavity near the lower end face. The weak layer is a concrete layer without stirrups.

8. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 7, characterized in that, A main beam buffer pad is provided between the main beam of the bridge and the main beam support block.

9. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 8, characterized in that, The bridge cap beam is also provided with horizontal and longitudinal reinforcement bars, which are arranged alternately.

10. The replaceable transverse stop block for small and medium-sized cross-border bridges with shape memory alloy steel bars according to claim 9, characterized in that, The transverse blocks of the bridge are provided with inverted U-shaped steel bars on the side wall near the main beam of the bridge, and the lower end of the inverted U-shaped steel bars is connected to the bridge cap beam.

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