CN106567326A - Parallel double-rope type damping block having self-reset function - Google Patents

Abstract

The invention discloses a parallel double-cable damping block with self-resetting function, which includes a cover beam, a plate rubber bearing and a bridge upper structure, and the plate rubber bearing is fixed on the cover beam through a bearing pad and supported on The lower part of the bridge superstructure; each side of the bridge superstructure is provided with a stopper fixed on the cover beam, and a prestressed steel strand and an energy dissipation cable are anchored between the stoppers on both sides; the inner side of the stopper, Rubber blocks are provided on the outer side of the bridge superstructure corresponding to the inner side of the block. The invention can realize that during the deformation process of the block, the high-resistance energy-dissipating cable dissipates the seismic energy, plays a role of buffering and protecting the block, and can solve the problem of beam falling beams of simply supported beam bridges in high-intensity areas, and Significantly improve the overall seismic performance level of this type of bridge.

Description

A parallel double-cable shock-absorbing stopper with self-resetting function

technical field

The invention relates to the technical field of bridge anti-seismic and bridge anti-seismic isolation, in particular to a parallel double-cable anti-vibration block with self-resetting function.

Background technique

Traffic is the lifeblood of the national economy, and bridges are the lifeline projects of transportation. Under the action of earthquake, the bridge will be affected by the components of horizontal earthquake along the bridge direction and across the bridge direction. The blocks will be sheared and damaged, resulting in beam damage to the bridge superstructure.

At present, there are two main methods to solve the earthquake damage caused by falling beams in the upper structure of the bridge. One is to increase the geometric size and reinforcement ratio of the block to directly resist the earthquake, and the other is to use a High capacity new fiber material pouring block. Practice has proved that the blocks made by the two methods have shear failures under the action of rare earthquakes, and lead to the occurrence of beam falling accidents in the superstructure.

According to a large number of domestic and foreign bridge anti-seismic, shock absorption and isolation patents on transverse stoppers and engineering experience in actual construction, it can be seen that the on-site production process of transverse stoppers with self-resetting function is complicated, the construction is difficult and the project cost is high.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a parallel double-cable shock-absorbing block with self-resetting function, which can ensure the self-resetting of the block after the earthquake, prevent the bridge from falling laterally, and reduce the vibration of the bridge at the same time. Post-repair costs. The technical solution is as follows:

A parallel double-cable shock-absorbing block with self-resetting function, including a cover beam, a plate-type rubber bearing and a bridge superstructure. The plate-type rubber bearing is fixed on the cover beam through a bearing pad and supported on the bridge superstructure below; on both sides of the bridge superstructure there is a block fixed on the cover beam, and a prestressed steel strand and an energy-dissipating cable are anchored between the blocks on both sides; the inner side of the block and the block Rubber blocks are provided on the outside of the bridge superstructure corresponding to the inside of the blocks.

Further, the outer side of the block is provided with steel embedded parts, and the steel embedded parts are provided with tunnels for anchoring energy-dissipating cables and prestressed steel strands to which prestressing loads are applied.

Furthermore, the inner side of the stopper is provided with a wedge-shaped rubber block, which is parallel to the contact surface of the rubber block on the outer side of the bridge superstructure.

Furthermore, the energy-dissipating cable is made of damping material with a damping ratio of 0.03-0.05.

Further, the distance between the prestressed steel strand and the energy dissipation cable is 8-15cm.

Furthermore, the parallel distance between the inner side of the stopper and the rubber block set on the outer side of the bridge superstructure is 15-25 cm.

The beneficial effects of the present invention are:

1) The present invention can achieve multi-level seismic design. When the bridge structure is subjected to medium and small earthquakes, the bridge superstructure will deviate laterally. Since the prestressed cable connects the two transverse blocks to jointly resist the seismic force, the beam body will be in contact with the seismic force at this time. A slight collision occurs to the block, and the rubber attached to the contact surface of the block and the beam body can also dissipate the seismic energy and play a buffer role; when the bridge structure is subjected to a large earthquake, the lateral displacement of the beam body and the impact energy Larger, the high damping energy-dissipating cables set at this time will play a role, and the energy of the beam hitting the block will be absorbed by the energy-dissipating cables, which will limit the further deformation of the block, thereby reducing the lateral offset of the superstructure and ensuring the bridge There will be no beam falling accident in the upper structure, and the energy-dissipating cable has spring mechanical properties, which can make the stopper self-reset after the earthquake;

2) The prestressed cables, high-damping energy-dissipating cables and rubber pads of the present invention form a multiple energy-dissipating shock-isolation system, which dissipates earthquake energy together, reduces collision damage between blocks and beams, and improves the performance of bridges on cross bridges. To the seismic capacity;

3) The force mode of the whole block system of the present invention is clear, and the transverse block is connected by two cables, so that the impact force can be simulated and calculated more accurately during bridge design;

4) The present invention has good applicability to bridges of different bridge types and seismic fortification levels, and can meet the seismic design requirements of different projects by adjusting the bundle number of prestressed cables and the damping parameters of energy-dissipating cables;

5) The present invention also has the characteristics of simple structure, convenient construction and low engineering cost.

Description of drawings

Fig. 1 is a structural schematic diagram of a parallel double-cable damping block with self-resetting function according to the present invention.

Fig. 2 is a schematic cross-sectional view at A-A in Fig. 1 .

Fig. 3 is an enlarged view of B in Fig. 1 .

In the figure: 1-cover beam; 2-support pad; 3-bridge superstructure; 4-block; 5-plate rubber bearing; 6-wedge rubber block; 7-channel; 8-steel embedded parts; 9-anchor backing plate; 10-anchor; 11-prestressed steel strand; 12-energy dissipation cable.

detailed description

The idea, specific structure and effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. As shown in Figure 1-3, a parallel double-cable damping block with self-resetting function is characterized in that it includes a cover beam 1, a plate rubber bearing 5 and a bridge superstructure 3, and the plate rubber bearing 5 passes through The support pad 2 is fixed on the cover beam 1 and supported under the bridge superstructure 3; a stopper 4 fixed on the cover beam 1 is arranged on both sides of the bridge superstructure 3, and a stopper 4 is fixed between the two stoppers 4 A prestressed steel strand 11 and an energy-dissipating cable 12; the inner side of the block 4 and the outer side of the bridge superstructure 3 corresponding to the inner side of the block 4 are provided with rubber blocks.

The outer side of the block 4 in this embodiment is provided with a steel embedded part 8, and the steel embedded part 8 is provided with a channel 7 for anchoring the energy-dissipating cable 12 and the prestressed steel strand 11 applied with the prestressing load. Specifically, during the pouring process of the stopper 4, a steel plate with a thickness of about 3-4 cm needs to be embedded on the outside of the stopper 4, the upper end is flush with the stopper 4, and the lower end exceeds the energy dissipation cable by about 12-15 cm. The horizontal width of the steel plate is about 30cm. Two holes 7 with a diameter of about 10 cm need to be reserved for the stoppers 4 at both ends, which are used for passing the prestressed steel strand 11 and the energy-dissipating cable 12 . When the concrete curing age of the block 4 is reached, the prestressed load can be applied to the prestressed steel strand 11, the anchor plate 9 and the anchorage 10 are set outside the block 4 for anchoring, and the reserved tunnel 7 is fixed. Grouting (cement slurry) and anchoring ends for anchor sealing. The construction process of the high-resistance energy-dissipating cable 12 is basically the same as that of the prestressed steel strand 11. The only difference is that the energy-dissipating cable does not need to be prestressed, and only needs to be anchored to the stopper 4.

The prestressed steel strand 11 of this embodiment has a single-bundle diameter of 15.24mm and a tensile strength of 1860MPa; The distance between 12 is 8~15cm, which is the distance shown by L1 in FIG. 3 .

After the above process is completed, rubber pads are provided on the outer side of the superstructure beam body 3 and the inner side of the stopper 4, and the rubber pads on the inner side of the stopper 4 need to be cut into wedge-shaped rubber blocks 6. In this embodiment, the inner side of the stopper 4 is The contact surfaces of the wedge-shaped rubber blocks 6 and the bridge superstructure 3 outer rubber blocks are parallel to each other, that is, the angles between the contact surfaces of the two rubber pads and the horizontal plane are equal to ensure that the contact area of the two rubber pads is maximum during earthquakes. The parallel distance between the inner side of the block 4 and the rubber block set on the outer side of the bridge superstructure 3 is 15-25 cm, that is, the distance shown by L2 in FIG. 3 .

The anti-seismic block structure of this embodiment can also be applied to the position of the abutment.

When the bridge structure is in normal use, due to the load or the action of small and medium earthquakes, the bridge superstructure has a certain lateral displacement, and the transverse stopper 4 on the cover beam 1 is anchored by the prestressed steel strand 11. The two transverse blocks can jointly resist the seismic load. At this time, the beam body will collide with the block slightly, and the rubber pads attached to the contact surface of the block 4 and the beam body can also dissipate the seismic energy and play a buffer role. At this time, the two stoppers 4 are in a state of elastic stress, and there is basically no damage.

When the bridge structure is subjected to rare earthquakes (major earthquakes), the lateral displacement and impact energy of the bridge superstructure 3 will be large, which will exceed the elastic deformation capacity of the prestressed steel strand 11. At this time, the high-damping energy-dissipating cable 12 will Playing a leading role, the energy of the beam hitting the block 4 is absorbed by the energy-dissipating cable 12, which limits the further deformation of the block 4, thereby reducing the lateral offset of the bridge superstructure 3 and ensuring that the bridge superstructure 3 does not fall. Beam accident, and the energy dissipation cable 12 has spring mechanical properties, which can make the stopper 4 reset in time after the earthquake. When the bridge superstructure swings back and forth in the direction of the transverse bridge, the prestressed steel strand 11, the energy-dissipating cable 12 and the transverse stopper 4 interact, and the energy-dissipating cable 12 will alternately absorb and dissipate seismic energy, cleverly transforming the seismic energy into The energy-dissipating components have significantly improved the seismic performance of the bridge.

Claims (6)

1. a kind of double cable-styled shock-absorption dogs of parallel connection with runback bit function, it is characterised in that including bent cap（1）, board-like rubber Bearing（5）And bridge superstructure（3）, laminated rubber bearing（5）By bearing cushion block（2）It is fixed on bent cap（1）On, and support In bridge superstructure（3）Lower section；Bridge superstructure（3）Both sides respectively set one and are fixed on bent cap（1）On block（4）, Both sides block（4）Between anchor a prestress wire（11）With a power consumption rope（12）；The block（4）Inner side, and with Block（4）The corresponding bridge superstructure in inner side（3）Outside be equipped with block rubber.

2. double cable-styled shock-absorption dogs of parallel connection with runback bit function according to claim 1, it is characterised in that the gear Block（4）Outside be provided with steel built-in fitting（8）, steel built-in fitting（8）It is provided with for anchoring power consumption rope（12）Be applied with prestressing force lotus The prestress wire of load（11）Duct（7）.

3. double cable-styled shock-absorption dogs of parallel connection with runback bit function according to claim 1, it is characterised in that the gear Block（4）Inner side arrange for wedge shape rubber block（6）, itself and bridge superstructure（3）The contact surface of outer rubber block is parallel to each other.

4. double cable-styled shock-absorption dogs of parallel connection with runback bit function according to claim 1, it is characterised in that the consumption Can rope（12）Adopt damping ratio and be made up of 0.03 ~ 0.05 damping material.

5. double cable-styled shock-absorption dogs of parallel connection with runback bit function according to claim 1, it is characterised in that described pre- Prestress steel strand（11）With power consumption rope（12）Between distance be 8 ~ 15cm.

6. double cable-styled shock-absorption dogs of parallel connection with runback bit function according to claim 1, it is characterised in that the gear Block（4）Inner side and bridge superstructure（3）The parallel distance of the rubber block part that outside is arranged is 15 ~ 25 cm.