CN106702882A - Hydraulic force distribution buffering device - Google Patents

Abstract

The invention discloses a hydraulic force component buffer device, which comprises a double-rod piston hydraulic cylinder with a return spring inside, and two hydraulic bypasses connecting the cylinder cavities on both sides of the piston through oil pipes are arranged on the double-rod piston hydraulic cylinder. , the two hydraulic bypasses are equipped with control valves that use decompression to buffer and distribute the brake and earthquake impact force transmitted from the bridge girder to the double-rod piston hydraulic cylinder. The installation directions of the two control valves are opposite to each other. One end of the rod-piston hydraulic cylinder is provided with a first mounting ear connected to the free end of the piston rod, and the other end is also provided with a second mounting ear fixedly connected with the cylinder end surface of the double-rod piston hydraulic cylinder. The invention is used to connect the main girders (slabs) of adjacent bridge spans, distribute the horizontal impact forces such as braking and earthquakes borne by the main girders (slabs) to adjacent multi-span bridge piers, and the multiple bridge piers share the impact force, effectively preventing The bridge pier tilts or the bridge girder (slab) falls.

Description

A hydraulic force component buffer device

technical field

The invention relates to a hydraulic force component buffer device, which is applied to the connection of bridge girders (slabs) of adjacent spans. It can distribute the horizontal impact forces such as brakes and earthquakes borne by the bridge girders (slabs) to adjacent multi-span bridge piers. Going up, the impact force is shared by multiple piers to prevent the pier from tilting or the main girder (slab) of the bridge from falling. It can be widely used in railways, highways, urban viaducts, diversion bridges and other structures that need to resist impact loads.

Background technique

For railways, highways, and urban viaducts, due to the need to eliminate the temperature stress of the bridge structure caused by temperature differences, many bridge structures adopt simply supported beams. One end of the main beam (plate) of the bridge is a movable support 23, and the other end is a fixed support. Seat 24 (see Fig. 4), the main girder (plate) of the bridge can freely expand and contract on the pier 25 to release the temperature stress. However, this structure cannot withstand excessive horizontal impact loads such as braking or starting, earthquakes, etc. Otherwise, the bridge piers, especially the high-piled bridge piers of tens of meters or even hundreds of meters, will easily be tilted by the horizontal impact force or cause the main beam of the bridge to collapse. (board) falls.

For this reason, the hydraulic component force buffer device can be used to connect the main girders (slabs) of adjacent spans (see Figure 5), and distribute horizontal impact forces such as braking and earthquakes to adjacent multi-span piers. Jointly bear the impact force, which can effectively prevent the pier from tilting or the girder (slab) from falling. The hydraulic force component buffer device can not only eliminate the temperature stress of the bridge, but also buffer and distribute the impact load, and can make the ability of each pier to bear the impact force different according to different conditions such as pile foundation depth, geological conditions and abutment height. According to the design requirements, the impact force is distributed to multiple piers in a fixed amount.

Contents of the invention

In view of the above technical problems, the present invention aims to provide a hydraulic component buffer device which can not only eliminate the temperature stress of the bridge, but also buffer and distribute the impact load.

The present invention is realized by adopting the following technical solutions:

A hydraulic force component buffer device, comprising a double-rod piston hydraulic cylinder with a return spring inside, the double-rod piston hydraulic cylinder is provided with two hydraulic bypasses that communicate with the cylinder chambers on both sides of the piston through oil pipes, and the two hydraulic The bypass is equipped with a control valve that uses decompression to buffer and distribute the brake and earthquake impact force transmitted from the bridge main girder to the double-rod piston hydraulic cylinder. One mounting ear, and the other end is also provided with a second mounting ear fixedly connected with the end surface of the cylinder body of the double-rod piston hydraulic cylinder.

This scheme uses the hydraulic component force buffer device to connect the main girders (slabs) of the adjacent spans of the bridge, which are installed on both sides of the two ends of the main girders, and distribute the horizontal impact forces such as braking and earthquakes on the main girders (slabs) to the adjacent multi-spans. When the bridge piers go up, multiple piers share the impact force to prevent the bridge piers from tilting or the main girder (slab) of the bridge from falling. It can be applied to railways, highways, urban viaducts, diversion bridges and other structures to resist impact loads.

Further, the control valve is a combination of a throttle valve and a one-way valve in series, a relief valve, a parallel connection of a throttle valve and a relief valve, or a series connection of a pressure reducing valve and a throttle valve, or a combination of a throttle valve and a throttle valve. Flow valve, one-way valve, relief valve, relief valve, one or more of which are combined in series and parallel. Under the action of impact tension or impact pressure, the oil pressure of the left chamber and right chamber of the hydraulic cylinder is different, so that The hydraulic oil flows between the left and right chambers through the control valve, and the control valves with different load characteristics and their combinations are used to realize the fixed buffer and distribution of the impact load, and the impact load is distributed to each pier as required.

Further, the outer side of one end of the cylinder body of the double-rod piston hydraulic cylinder is provided with a small orifice connected to the inner chamber of the double-rod piston hydraulic cylinder and an annular air bag, and the volume of the annular air bag is adapted to the expansion and contraction of the bridge main girder. The annular air bag communicates with the hydraulic cylinder chamber through a small throttle hole, which can release the volume expansion pressure of the hydraulic oil caused by the temperature rise. Compared with the rapid change of the impact load, the temperature change is slow, and the temperature stress caused by the change is also slow. Using the control valve The normally open orifice can balance the pressure in the left and right chambers of the oil cylinder, so that the main beam (plate) can slowly expand and contract freely to release its temperature stress, or the annular airbag can absorb the temperature stress of the main beam (plate). The hydraulic oil in the hydraulic component buffer device is filled with the left and right chambers of the closed hydraulic cylinder. When the temperature rises, the volume of the hydraulic oil will expand slightly to increase the oil pressure. This expansion oil pressure can be reduced by throttling. Holes and annular airbags are used to release rapidly changing impact loads, which cannot be transmitted to the airbags due to the huge resistance generated by small orifices, so the airbags do not affect the distribution and buffering characteristics of the hydraulic component force buffer device for impact loads.

Further, the annular airbag cover is covered with an annular airbag shell fixed outside the cylinder body of the double-rod piston hydraulic cylinder, which plays a role of protection and support for the annular airbag.

Further, the cylinder body of the double-rod piston hydraulic cylinder includes a cylindrical main cylinder body 1 with one end open and one end sealed, and a cylinder head and a sealing gasket fixed at the opening of the main cylinder body by cylinder head bolts.

Further, the second mounting ear is connected to the cylinder end face of the double-rod piston hydraulic cylinder through a cylindrical dust-proof cylinder with one end sealed and one end open, and the outside of the sealed end of the dust-proof cylinder is connected to the second mounting ear. The open end of the dust-proof cylinder is connected to the cylinder end face of the double-rod piston hydraulic cylinder through connecting bolts, flanges and gaskets, which is used to protect the piston rod from dirt and dust pollution and improve Its durability also plays a role in bearing impact loads.

Further, the dust-proof cylinder is provided with an exhaust hole to prevent the dust-proof cylinder from accumulating excessive pressure due to temperature difference.

Further, a dustproof cover is provided outside the piston rod connected to the first mounting ear to prevent the piston rod from being polluted by dirt and dust.

Further, the dustproof cover is a stretchable corrugated rubber cover with good elasticity and stretchability.

Compared with the prior art, this hydraulic component buffer device has the following characteristics:

1. It can transmit and adjust fast-changing loads, release slowly-changing loads, and adapt to the load characteristic requirements of simply supported beam bridges to resist braking, earthquake and other impact forces and release temperature and other stresses.

2. The impact load can be distributed in a fixed amount, adapting to the different impact load bearing capacity of the bridge pier due to different conditions such as pile foundation depth, geological conditions and abutment height, and distribute the impact force to different bridge piers according to the design requirements.

3. The left and right chambers of the hydraulic cylinder are filled with hydraulic oil without gaps, the transmitted load increases and decreases smoothly, and there is no impact phenomenon of instant start.

4. Through the small orifice, the annular airbag can absorb the expansion oil pressure caused by the temperature rise, and has the auxiliary function of releasing the temperature stress of the main girder (plate) of the bridge.

5. The moving parts of the hydraulic component buffer device are all in the hydraulic oil, which is well lubricated, and can prevent oxidation and corrosion, and has high durability.

6. The two-way piston rod has a guiding function at the same time, which can reduce piston wear, prevent jamming, and improve operational reliability.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the hydraulic component force buffer device of the present invention.

Fig. 2 is a schematic left view of the hydraulic component force buffer device of the present invention.

Fig. 3 is a schematic diagram of impact force of the hydraulic component force buffer device of the present invention.

Figure 4 is a schematic diagram of a traditional bridge pier support.

Figure 5 is a schematic diagram of installing a hydraulic force component buffer device between bridge girders (slabs).

Fig. 6 is a schematic cross-sectional view along A-A in Fig. 5 .

Fig. 7 is a schematic structural diagram of the first control valve according to Embodiment 1 of the present invention (throttle valve and one-way valve connected in series).

Fig. 8 is a schematic structural diagram of a second control valve according to Embodiment 1 of the present invention.

Fig. 9 is an impact force-load characteristic diagram of Embodiment 1 of the present invention.

Fig. 10 is a temperature stress characteristic diagram of the main girder in Embodiment 1 of the present invention.

Fig. 11 is a schematic structural diagram of the first control valve (overflow valve) according to the second embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a second control valve according to Embodiment 2 of the present invention.

Fig. 13 is a characteristic diagram of impact force-load of Embodiment 2 of the present invention.

Fig. 14 is a temperature stress characteristic diagram of the main girder in the second embodiment of the present invention.

Fig. 15 is a schematic structural diagram of the first control valve according to the third embodiment of the present invention (throttle valve and relief valve are connected in parallel).

Fig. 16 is a schematic structural diagram of the second control valve according to the third embodiment of the present invention.

Fig. 17 is a characteristic diagram of impact force-load of the third embodiment of the present invention.

Fig. 18 is a temperature stress characteristic diagram of the main girder according to the third embodiment of the present invention.

Fig. 19 is a schematic structural diagram of the first control valve according to Embodiment 4 of the present invention (the decompression valve and the throttling valve are connected in series).

Fig. 20 is a schematic structural diagram of the second control valve according to Embodiment 4 of the present invention.

Fig. 21 is an impact force-load characteristic diagram of Embodiment 4 of the present invention.

Fig. 22 is a temperature stress characteristic diagram of the main girder according to the fourth embodiment of the present invention.

The figure shows: 1-main cylinder, 2-cylinder head, 3-piston, 4-piston rod, 5-return spring, 6-sealing washer, 7-sealing ring, 8-cylinder head bolt, 9 throttle Small hole, 10-annular airbag, 11-annular airbag shell, 12-gasket, 13-connecting bolt, 14-dustproof cylinder, 15-exhaust hole, 16-oil pipe, 17-first control valve, 18- Second control valve, 19-dust cover, 20-installation ear, 21-hydraulic oil, 22-right span bridge main beam; 23-movable support; 24-fixed support; 25-bridge pier; 26-left span bridge Main beam; 27-hydraulic force component buffer device installation groove.

detailed description

In order to show the purpose and technical solution of the present invention in detail and clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The examples described are only used to illustrate the present invention, not all examples of the present invention, and do not limit the protection scope of the present invention.

Embodiment one

As shown in Figures 1-3 and Figures 6-10, a hydraulic force component buffer device includes a double-rod piston hydraulic cylinder with a return spring 5 inside, and the cylinder body of the double-rod piston hydraulic cylinder includes an opening at one end, A cylindrical main cylinder body 1 with one end sealed, and a cylinder head 2 and a sealing gasket 6 fixed on the opening of the main cylinder body 1 through cylinder head bolts 8. The double-rod piston hydraulic cylinder is provided with two pistons 3 connected through oil pipes 16. The hydraulic bypasses of the cylinder chambers on both sides are respectively equipped with the first control valve 17 and the second control valve 17 which use decompression to buffer and distribute the brake and earthquake impact force transmitted from the bridge girder to the double-rod piston hydraulic cylinder. The second control valve 18, the first control valve 17 and the second control valve 18 are composed of a throttle valve and a check valve in series. The installation directions of the two control valves are opposite to each other. The valve 17 flows from the left chamber to the right chamber. When the impact pressure is applied, the hydraulic oil flows from the right chamber to the left chamber through the control valve 18. When the impact force is cancelled, the return spring 5 gradually restores the piston 3 to its original position. One end of the double-rod piston hydraulic cylinder is provided with a first mounting ear 20 connected to the free end of the piston rod 4, and the other end is also provided with a second mounting ear 28 fixedly connected to the cylinder end face of the double-rod piston hydraulic cylinder, wherein the The second mounting ear 28 is connected to the cylinder end face of the double-rod piston hydraulic cylinder through a cylindrical dust-proof cylinder 14 with one end sealed and one end open. The dust-proof cylinder 14 is provided with an exhaust hole 15. The outer side of the sealed end of the dust-proof cylinder 14 is welded to the second mounting ear 28, and the edge of the opening end of the dust-proof cylinder 14 is connected to the cylinder of the double-rod piston hydraulic cylinder through connecting bolts 13, flanges and gaskets 12. The end face of the body is not only used to protect the piston rod from dirt and dust, to improve its durability, but also to bear the impact load.

The outer side of the right end of the cylinder body of the double-rod piston hydraulic cylinder is provided with a small orifice 9 that communicates with the inner cavity of the double-rod piston hydraulic cylinder and the annular air bag 10, the volume of the annular air bag 10 is adapted to the expansion and contraction of the main beam of the bridge, The annular airbag 10 is covered with an annular airbag shell 11 fixed outside the cylinder body of the double-rod piston hydraulic cylinder.

The piston rod connected to the first mounting ear 20 is provided with a dustproof cover 19 for protecting the piston rod from dirt and dust pollution, and the dustproof cover 19 is a stretchable corrugated rubber sleeve.

When in use, the hydraulic component force buffer device of this embodiment is installed in the hydraulic component force buffer device installation grooves 27 located at both ends of the bridge main girder, and the left span bridge main body is connected through the first mounting ear 20 and the second mounting ear 28. Beam 26 and right span bridge girder 22. Figure 4 is a schematic diagram of the impact force of the oil cylinder. The hydraulic oil 21 fills the left and right chambers of the hydraulic cylinder, and the left and right chambers are connected through the first control valve 17 and the second control valve 18. The control valve is composed of a throttle valve and a check valve in series. Its load characteristics are shown in Figure 5 ; The transfer load P increases with the increase of the impact force, while the temperature stress of the bridge girder (slab) is completely released; adjusting the throttle valve can achieve different buffering and distribution requirements of the impact force. When there is an impact pulling force, the left chamber of the oil cylinder generates high oil pressure while the right chamber generates low oil pressure. The hydraulic oil flows from the left chamber to the right chamber through the first control valve 17. When there is an impact pressure, the right chamber of the oil cylinder generates high oil pressure. The oil pressure is low while the left chamber is low, and the hydraulic oil flows from the right chamber to the left chamber through the second control valve 18; when the impact force is withdrawn, the return spring 5 gradually restores the piston 3 to the initial position. The annular airbag 10 communicates with the hydraulic cylinder chamber through the small orifice 9, which can release the volume expansion pressure of the hydraulic oil caused by the temperature rise, but for the rapidly changing impact load, it cannot be transmitted to the airbag due to the huge resistance generated by the small orifice ; The hydraulic force component buffer device can be applied to railways, highways, urban viaducts, diversion bridges and other structures to resist impact loads.

Embodiment two

As shown in FIGS. 11-14 , the difference between this embodiment and Embodiment 1 is that: the control valve adopts a relief valve, and the installation directions of the two control valves are opposite to each other.

Its load characteristics are shown in Figure 13: the transfer load P increases linearly with the impact force first and then maintains a constant value (set value). Adjusting the overflow valve can be clearly distributed to the adjacent span bridge girders (slabs) according to the design requirements. Quantitative impact force; most of the temperature stress of the bridge girder (slab) is absorbed by the annular airbag 10, and a small amount of temperature stress can pre-tighten the shrinkage joint without any adverse effect on the bridge structure. When there is an impact pulling force, the left chamber of the oil cylinder generates high oil pressure while the right chamber has low oil pressure. After the oil pressure reaches the set pressure of the relief valve, the hydraulic oil flows from the left chamber to the right chamber through the first control valve 17; When impact pressure occurs, the right chamber of the oil cylinder generates high oil pressure while the left chamber has low oil pressure. After the oil pressure reaches the set pressure of the relief valve, the hydraulic oil flows from the right chamber to the left chamber through the second control valve 18; shock When the force is withdrawn, the return spring 5 gradually restores the piston 3 to its initial position. The annular airbag 10 is connected with the hydraulic cylinder chamber through the orifice 9, which can release the volume expansion pressure of the hydraulic oil caused by the temperature rise, but for the rapidly changing impact load, it cannot be transmitted to the annular airbag due to the huge resistance generated by the small orifice 10 above; the hydraulic force component buffer device can be applied to railways, highways, urban viaducts, diversion bridges and other structures to resist impact loads.

Embodiment three

As shown in Figures 15-18, the difference between this embodiment and Embodiment 1 is that the control valve is composed of a throttle valve and a relief valve connected in parallel, and the installation directions of the two control valves are opposite to each other. For their load characteristics, see As shown in Figure 17: the transfer load P first increases with the impact force and then remains constant (set value), while the temperature stress of the bridge girder (slab) is completely released; the overflow valve can be adjusted according to the design requirements to the adjacent The bridge girders (slabs) distribute well-defined and quantitative impact forces. When there is an impact pulling force, the left chamber of the oil cylinder generates high oil pressure while the right chamber has low oil pressure. The hydraulic oil first flows from the left chamber to the right chamber through the throttle valve in the first control valve 17, and the hydraulic oil reaches the overflow. After the pressure set by the valve, the hydraulic oil flows from the left chamber to the right chamber through the throttle valve and overflow valve in the first control valve 17 at the same time; When the oil pressure is low, the hydraulic oil flows from the right chamber to the left chamber according to the same rule as above; when the impact force is cancelled, the return spring 5 gradually restores the piston 3 to its initial position. The annular airbag 10 is connected with the hydraulic cylinder chamber through the small orifice 9, which can release the volume expansion pressure of the hydraulic oil caused by the temperature rise, but for the rapidly changing impact load, the small orifice produces a huge resistance and cannot be transmitted to the hydraulic cylinder. On the airbag; the hydraulic force component buffer device can be applied to railways, highways, urban viaducts, diversion bridges and other structures to resist impact loads.

Embodiment Four

As shown in Figures 19-22, the difference between this embodiment and Embodiment 1 is that the control valve is composed of a pressure reducing valve and a throttle valve connected in series, and the installation directions of the two control valves are opposite to each other. For the load characteristics, see As shown in Figure 21; the transfer load P increases steadily with the impact load, while the temperature stress of the main girder (slab) of the bridge is completely released; adjusting the pressure reducing valve and the throttle valve can be adjusted according to the design requirements to the adjacent span bridge main girder ( plate) to transmit the impact force of different quota distribution, and make the deformation speed of the bridge structure stable, avoiding the impact phenomenon of adjacent girders when the pier moves sideways. When there is an impact pulling force, the left chamber of the oil cylinder generates high oil pressure while the right chamber has low oil pressure, and the hydraulic oil flows from the left chamber to the right chamber through the first control valve 17; when there is an impact pressure, the right chamber of the oil cylinder generates high oil pressure. The oil pressure is low while the left chamber is low, and the hydraulic oil flows from the right chamber to the left chamber through the second control valve 18; when the impact force is withdrawn, the return spring 5 gradually restores the piston 3 to the initial position. The annular airbag 19 communicates with the hydraulic cylinder chamber through the small orifice 9, which can release the volume expansion pressure of the hydraulic oil caused by the temperature rise, but for the rapidly changing impact load, it cannot be transmitted to the airbag due to the huge resistance generated by the small orifice ; The hydraulic force component buffer device can be applied to railways, highways, urban viaducts, diversion bridges and other structures to resist impact loads.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (9)

1. the through-rod piston hydraulic cylinder of back-moving spring (5) is set in a kind of hydraulic pressure component buffer unit, including one, it is characterised in that：Two hydraulic pressure for connecting the side cylinder cavity of piston (3) two by oil pipe (16) are provided with the through-rod piston hydraulic cylinder to bypass, it is provided with using depressurization to buffer and distribute the control valve that bridge girder passes to the brake of through-rod piston hydraulic cylinder, earthquake shock power in two hydraulic pressure bypasses, one end of the through-rod piston hydraulic cylinder is provided with first mounting ear (20) of connection piston rod (4) free end, and the other end is additionally provided with the second mounting ear (28) being fixedly connected with the cylinder body end face of through-rod piston hydraulic cylinder.

2. hydraulic pressure component buffer unit according to claim 1, it is characterised in that：It is described to control valve to be formed with check valve tandem compound for choke valve, overflow valve, constituted or in series by pressure-reducing valve and choke valve by choke valve is in parallel with overflow valve.

3. the hydraulic pressure component buffer unit according to any one of claim 1 or 2, it is characterised in that：Cylinder body one end outside of the through-rod piston hydraulic cylinder is provided with throttling pore (9) connection through-rod piston cylinder chamber and annular air-pocket (10), and the volume of the annular air-pocket (10) is adapted with the stroke of bridge girder.

4. hydraulic pressure component buffer unit according to claim 3, it is characterised in that：Annular air-pocket (10) outer cover is covered with the annular air-pocket shell (11) being fixed on the outside of the cylinder body of the through-rod piston hydraulic cylinder.

5. hydraulic pressure component buffer unit according to claim 3, it is characterised in that：The cylinder body of the through-rod piston hydraulic cylinder includes one end open, the tubular Master cylinder body (1) that one end seals and the cylinder cap (2) and seal washer (6) that are fixed on by cylinder bolt (8) at Master cylinder body (1) opening.

6. hydraulic pressure component buffer unit according to claim 1 and 2, it is characterised in that：Second mounting ear (28) is sealed by one end, the cylinder body end face of the dust-proof cylinder body of the tubular (14) of the one end open connection through-rod piston hydraulic cylinder, mutually welded with the second mounting ear (28) in the sealed end outside of the dust-proof cylinder body (14), the open end edge of the dust-proof cylinder body (14) connects the cylinder body end face of the through-rod piston hydraulic cylinder by connecting bolt (13), flange and pad (12), both it had been used to protect piston rod from dirt, the pollution of dust, its durability is improved, the load that withstands shocks is played a part of again.

7. hydraulic pressure component buffer unit according to claim 6, it is characterised in that：Steam vent (15) is provided with the dust-proof cylinder body (14).

8. hydraulic pressure component buffer unit according to claim 1 and 2, it is characterised in that：Protection piston rod is provided with outside the piston rod for connecting the first mounting ear (20) and pollutes dirt-proof boot (19) from dirt, dust.

9. hydraulic pressure component buffer unit according to claim 8, it is characterised in that：The dirt-proof boot (19) is scalable corrugated rubber set.