A continuous beam structure

Abstract

The present invention provides a continuous beam structure, including: a beam body, two side piers, at least two middle piers, two longitudinal movable supports and at least two high friction damping and seismic isolation supports; the two side piers are respectively arranged at the bottom of both ends of the beam body; the middle pier is symmetrically arranged at the bottom of the beam body between the two side piers; the longitudinal movable support is arranged between the top of the side pier and the bottom of the beam body; the high friction damping and seismic isolation support is arranged between the top of the middle pier and the bottom of the beam body. The present invention can be applied to move the fixed point of the temperature span of the continuous beam to the middle of the span, so that the temperature span of the continuous beam changes from asymmetric to symmetric, which greatly reduces the temperature span of the continuous beam, thereby reducing the use of rail expansion and contraction adjusters; further, it can also improve the seismic isolation effect, durability and economy.

Description

Technical Field

[0001] The present application relates to the technical field of high-speed railways, and in particular to a continuous beam structure. Background Art

[0002] At present, high-speed railways and intercity railways generally use seamless lines. According to the requirements of the seamless line track force, under normal circumstances, when the temperature length of the concrete beam is greater than 180m and the temperature length of the steel beam is greater than 120m, it is necessary to set a rail expansion adjuster to coordinate the expansion and contraction displacement of the bridge beam end caused by temperature.

[0003] Continuous beam bridges have the advantages of reasonable force, high rigidity, good integrity, large span, and good economy, and are widely used in railway bridges. Figure 1 As shown, a unit of continuous beams generally includes two middle piers, and a fixed support is usually set at one of the middle piers so that the fixed point of the temperature span is at the fixed support. This will cause the temperature span (temperature span refers to the length of the section where the bridge span structure expands and contracts due to temperature rise and fall) on one side of the bridge to be longer, while the temperature span on the other side is shorter, resulting in an unbalanced temperature span on both sides of the bridge.

[0004] In addition, when the span of the continuous beam commonly used in high-speed railways is greater than (side span 65 + middle span 112 + side span 65 = 242) m, its temperature span exceeds the limit, and a rail expansion regulator needs to be installed at this time. However, the rail expansion regulator in the prior art has the following problems in engineering applications:

[0005] (1) The requirements for the horizontal and vertical surfaces of the line are high, and rail expansion adjusters cannot be installed on bridges on curves and large longitudinal slope sections (>6‰).

[0006] (2) The construction cost is high, about RMB 1 to 1.2 million per line, and the service life is only 20 years, so the full life cycle cost is even higher.

[0007] (3) A bridge needs to be replaced 5 to 6 times within its 100-year service life, which requires a lot of maintenance and repair work.

[0008] (4) When the train passes through the rail expansion adjuster, it will shake, affecting the smoothness of the line.

[0009] In summary, since the continuous beams in the prior art have the problems mentioned above, how to propose a better continuous beam structure so as to reduce the temperature span of the bridge and minimize the use of rail expansion adjusters is a problem that needs to be solved urgently in this field. Summary of the invention

[0010] In view of this, the present invention provides a continuous beam structure, which can reduce the temperature span on both sides of the bridge and reduce the use of rail expansion adjusters.

[0011] The technical solution of the present invention is specifically achieved as follows:

[0012] A continuous beam structure, comprising: a beam body, two side piers, at least two middle piers, two longitudinal movable bearings and at least two high friction reduction and seismic isolation bearings;

[0013] The two side piers are respectively arranged at the bottom of both ends of the beam body;

[0014] The middle pier is symmetrically arranged at the bottom of the beam body between the two side piers;

[0015] The longitudinal movable support is arranged between the top end of the side pier and the bottom end of the beam body;

[0016] The high friction damping and seismic isolation support is arranged between the top end of the middle pier and the bottom end of the beam body.

[0017] Preferably, the high friction damping and seismic isolation bearing comprises: an upper bearing plate, a lower bearing plate, an intermediate lining plate, a plane friction pair, a spherical friction pair and two limit blocks;

[0018] The top of the upper support plate is fixedly connected to the bottom of the beam body, and the bottom of the lower support plate is fixedly connected to the top of the middle pier;

[0019] The middle lining plate is arranged between the upper support plate and the lower support plate;

[0020] The plane friction pair is arranged between the top surface of the middle lining plate and the bottom surface of the upper support plate;

[0021] The spherical friction pair is arranged between the bottom surface of the middle lining plate and the top surface of the lower support plate;

[0022] The two limit stops are respectively located on both sides of the top of the lower support plate and fixed on the bottom surface of the upper support plate, and there is a preset first distance between the limit stops and the outer side surface of the top of the lower support plate, and the top surface of the lower support plate is higher than the bottom surface of the limit stops.

[0023] Preferably, the planar friction pair and the spherical friction pair of the high-friction shock-reduction isolation bearing are both made of alloy.

[0024] Preferably, the upper surface of the planar friction pair is provided with grooves.

[0025] Preferably, the limit stop and the upper support plate are connected by bolts, wherein the bolts are special thin nut bolts, and corresponding bolt holes are respectively provided on the limit stop and the upper support plate, the special thin nut bolt passes through the bolt hole on the limit stop and is inserted into the bolt hole of the upper support plate, the special thin nut bolt is connected to the bolt hole of the upper support plate by threads, and the special thin nut bolt and the bolt hole of the limit stop are connected by interference fit.

[0026] Preferably, the limit stop block and the upper support plate are further connected via a pin shaft, and corresponding pin shaft holes are respectively provided on the limit stop block and the upper support plate, and the limit stop block and the upper support plate are further connected via a matching connection between the pin shaft and the pin shaft hole.

[0027] Preferably, the top surface of the middle liner and the bottom surface of the upper support plate are both planes, the bottom surface of the middle liner is a convex surface, the top surface of the lower support plate is a concave surface, and the convex surface of the middle liner matches the concave surface of the lower support plate.

[0028] Preferably, the upper support plate is fixedly connected to the bottom end of the beam body via a beam bottom anchoring device; the lower support plate is fixedly connected to the top end of the middle pier via a pier top anchoring device.

[0029] Preferably, a first sealing ring is provided at the outer edge between the top surface of the middle lining plate and the bottom surface of the upper support plate on the outer side of the planar friction pair; a second sealing ring is provided at the outer edge between the bottom surface of the middle lining plate and the top surface of the lower support plate on the outer side of the spherical friction pair.

[0030] Preferably, the engraving is wavy.

[0031] As can be seen from the above, in the continuous beam structure of the present invention, by arranging a high-friction shock-absorbing and isolation spherical bearing on the middle pier, the fixed point of the temperature span of the continuous beam can be moved to the middle of the span, so that the temperature span of the continuous beam changes from asymmetric to symmetric, which greatly reduces the temperature span of the continuous beam and reduces the use of rail expansion and contraction adjusters; further, it can also improve the shock-absorbing and isolation effect, and improve durability and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a continuous beam in the prior art.

[0033] Figure 2 Schematic diagram of a continuous beam structure in an embodiment of the present invention.

[0034] Figure 3 Schematic diagram of a high friction damping and seismic isolation bearing in an embodiment of the present invention.

[0035] Figure 4 It is a partial plan view of the planar friction pair in the embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] like Figure 2 As shown, the present invention provides a continuous beam structure, comprising: a beam body 5, two side piers 3, at least two middle piers 4, two longitudinal movable bearings 2 and at least two high friction reduction and seismic isolation bearings 1;

[0038] The two side piers 3 are respectively arranged at the bottom of both ends of the beam body 5;

[0039] The middle pier 4 is symmetrically arranged at the bottom of the beam body 5 between the two side piers 3;

[0040] The longitudinal movable support 2 is arranged between the top end of the side pier 3 and the bottom end of the beam body 5;

[0041] The high friction damping and seismic isolation support 1 is arranged between the top end of the middle pier 4 and the bottom end of the beam body 5 .

[0042] By setting a high friction damping and seismic isolation bearing 1 on the middle pier, there is no need to set a fixed bearing in the prior art. Under the action of temperature, the beam body 5 is freely and symmetrically expanded and deformed from the middle span to both sides, and the temperature expansion zero point is locked in the middle span, balancing the temperature spans on both sides of the bridge, so that the temperature spans on both sides of the bridge will not be too large. Therefore, as long as the temperature spans on both sides are within the limit, there is no need to set a rail expansion regulator, thereby reducing the use of rail expansion regulators and avoiding the disadvantages brought by rail expansion regulators, thereby increasing the application scope of large-span continuous beam structures in seamless lines. In addition, the span of the continuous beam can be further increased. For example, since the rail expansion regulator cannot be set when the curve or longitudinal slope is large, the span of the commonly used 3-span continuous beam is limited to (64+112+64)m and below. Since the present application does not need to set a rail expansion regulator, the expansion deformation of the beam body can be met, so the span of the 3-span continuous beam on the line with a curve or a large longitudinal slope can be increased to (90+180+90)m.

[0043] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above-mentioned high friction damping and seismic isolation bearing. The technical solution of the present invention will be described in detail below by taking one of the implementation methods as an example.

[0044] For example, preferably, in a specific embodiment of the present invention, Figure 3 As shown, the high friction damping and seismic isolation bearing 1 comprises: an upper bearing plate 18, a lower bearing plate 21, an intermediate lining plate 20, a plane friction pair 16, a spherical friction pair 15 and two limit blocks 11;

[0045] The top of the upper support plate 18 is fixedly connected to the bottom of the beam body 5, and the bottom of the lower support plate 21 is fixedly connected to the top of the middle pier 4;

[0046] The intermediate lining plate 20 is disposed between the upper support plate 18 and the lower support plate 21;

[0047] The plane friction pair 16 is arranged between the top surface of the middle lining plate 20 and the bottom surface of the upper support plate 18;

[0048] The spherical friction pair 15 is arranged between the bottom surface of the middle lining plate 20 and the top surface of the lower support plate 21;

[0049] The two limit blocks 11 are respectively located on both sides of the top of the lower support plate 21 and fixed on the bottom surface of the upper support plate 18, and there is a preset first distance 25 between the limit block 11 and the outer side surface of the top of the lower support plate 21, and the top surface of the lower support plate 21 is higher than the bottom surface of the limit block.

[0050] When the beam body 5 expands and contracts due to the temperature, the beam body 5 will expand and contract from the middle of the middle span to both sides, so that the beam bodies on both sides of the middle span will have sliding displacement. Since the upper support plate of the high friction damping and seismic isolation support is fixedly connected to the beam body, the beam body will drive the upper support plate to move, so that the upper support plate and the lower support plate 21 in the high friction damping and seismic isolation support symmetrically arranged on both sides will also have relative displacement, and the corresponding limit block will also move with the movement of the upper support plate. Assuming that the beam bodies on both sides of the middle span do not slide symmetrically, but only one side slides, since the limit blocks 11 are fixed at both ends of the upper support plate, and there is a preset first distance 25 between the limit block and the outer side surface of the top of the lower support plate 21, therefore, when the relative displacement between the upper support plate and the lower support plate in the high friction damping and seismic isolation support on the side where the sliding occurs reaches the first distance 25, the limit block moving with the upper support plate will abut against the outer side surface of the top of the lower support plate 21. Due to the limiting effect of the limit stopper, the beam on this side will stop sliding under the blocking of the limit stopper. Since the relative displacement between the upper support plate and the lower support plate in the high friction damping and seismic isolation support on the other side of the mid-span has not reached the first distance 25, the other side of the beam starts to slide at this time, and at the same time drives the upper support plate of the high friction damping and seismic isolation support on the other side to move, thereby ensuring balanced sliding of both sides of the beam, preventing the extreme phenomenon of sliding on only one side of the beam, and further preventing excessive expansion and contraction of one side of the beam, ensuring that the expansion and contraction amount of the end of the beam will not exceed the limit, and ensuring the quality and safety of the beam.

[0051] Preferably, the designed horizontal force of the limit stopper 11 is greater than the maximum static friction force of the support.

[0052] Preferably, as an example, the top surface of the intermediate lining plate 20 and the bottom surface of the upper support plate 18 are both planes, the bottom surface of the intermediate lining plate 20 is a convex surface, and the top surface of the lower support plate is a concave surface, and the convex surface of the intermediate lining plate 20 matches the concave surface of the lower support plate.

[0053] Since the top surface of the middle lining plate and the bottom surface of the upper support plate are both flat and have an appropriate friction coefficient, the stability of the beam during operation can be guaranteed. When the beam expands and contracts due to temperature, horizontal relative sliding can occur. The bottom surface of the middle lining plate 20 and the lower support plate are matched with convex and concave surfaces and have a smaller friction coefficient, thereby ensuring the rotation function of the support.

[0054] Preferably, as an example, the upper support plate 18 is fixedly connected to the bottom end of the beam body 5 via a beam bottom anchoring device 17 ; the lower support plate 21 is fixedly connected to the top end of the middle pier 4 via a pier top anchoring device 22 .

[0055] Preferably, the beam bottom anchoring device 17 and the pier top anchoring device 22 may be anchor bolts.

[0056] For another example, preferably, in a specific embodiment of the present invention, Figure 3 As shown, the planar friction pair 16 and the spherical friction pair 15 of the high-friction shock-absorbing and isolation bearing 1 are both made of alloy.

[0057] Preferably, as an example, a first sealing ring 19 is provided at the outer edge between the top surface of the middle lining plate 20 and the bottom surface of the upper support plate 18 on the outer side of the planar friction pair 16; a second sealing ring 26 is provided at the outer edge between the bottom surface of the middle lining plate 20 and the top surface of the lower support plate 21 on the outer side of the spherical friction pair 15.

[0058] The bridge bearing realizes the rotation and translation functions of the bearing through the friction pair. The ball bearing and pot-type rubber bearing used in railway bridges are generally made of stainless steel plate or hard chrome plated and rubber material or polymer material, and the friction coefficient u≤0.03. In the present invention, the friction pair is made of alloy and metal material is used, so that the friction pair of the high friction reduction and seismic isolation bearing has good wear resistance and excellent corrosion resistance. In addition, because the allowable compressive stress of the alloy friction pair is much greater than that of the rubber material or polymer material friction pair, the size of the bearing can be reduced, the weight of the bearing can be reduced, and the economy can be improved on the basis of ensuring the rotation and translation functions.

[0059] For another example, preferably, in a specific embodiment of the present invention, Figure 4 As shown, the upper surface of the planar friction pair 16 is provided with grooves 30, so as to increase the friction between the planar friction pair 16 and the upper support plate.

[0060] Preferably, the carvings may be wavy.

[0061] By providing grooves on the surface of the planar friction pair 16, the friction coefficient can be increased to 0.2≤u<0.3, so that under normal operating conditions of the line (maximum longitudinal slope and maximum traction braking of the train), the bearing will not slide but can rotate; and when the beam expands and contracts due to temperature changes, the bearing can slide normally to ensure the reliability and stability of the bridge.

[0062] In addition, as an example, in a preferred embodiment of the present invention, Figure 3 As shown, a panel 24 can be set on the outer side of the lower support plate 21, and the panel 24 on the lower support plate can be temporarily fixedly connected to the upper support plate 18 through a temporary connector 23, so as to facilitate installation and construction. After the construction is completed, the temporary connector can be removed.

[0063] Preferably, the temporary connecting member 23 may be a bolt.

[0064] In addition, as an example, in a preferred embodiment of the present invention, Figure 3 As shown, the limit stopper 11 and the upper support plate are connected by bolts, wherein the bolts use special thin nut bolts 13, and corresponding bolt holes are respectively provided on the limit stopper 11 and the upper support plate, and the special thin nut bolts 13 pass through the bolt holes on the limit stopper and are inserted into the bolt holes of the upper support plate, and the special thin nut bolts 13 are connected to the bolt holes of the upper support plate by threads, and the special thin nut bolts 13 and the bolt holes of the limit stopper 11 are connected by interference fit.

[0065] By using a special thin nut bolt, when the special thin nut bolt is damaged, it can be ensured that the nut is damaged before the threaded part. Since the special thin nut bolt is connected to the upper support plate by a threaded connection and has an interference fit with the limit block, it only bears tensile force. Therefore, even if the nut is damaged, the connection between the upper support plate and the limit block can still be maintained, thereby improving the reliability of the support.

[0066] In addition, as an example, in a preferred embodiment of the present invention, Figure 3 As shown, the limit stop block 11 and the upper support plate can be further connected by a pin shaft, and corresponding pin shaft holes are respectively provided on the limit stop block 11 and the upper support plate, and the limit stop block 11 and the upper support plate are further connected by the matching connection between the pin shaft 12 and the pin shaft hole.

[0067] Preferably, the design horizontal force of the pin 12 can be determined according to the size of the design earthquake force.

[0068] By setting a pin shaft, the pin shaft can bear the shear force of the support and work with the bolt to make the support have a seismic isolation effect. For example, when an earthquake occurs and the shear force exceeds the designed horizontal force of the pin shaft, the pin shaft 12 will be sheared off, and the thin nut of the special thin nut bolt 13 will also be sheared off. Under the action of the earthquake force, the interference fit between the special thin nut bolt 13 and the limit stopper 11 fails, causing the limit stopper 11 to fall off, so that the support can continue to slide, and the support can play a seismic isolation role at this time; in addition, the friction pair with high friction resistance can play a vibration reduction role like damping. After the earthquake, the support can be repaired by replacing the block pin shaft and bolts.

[0069] In addition, in terms of earthquake resistance, a conventional spherical bearing with earthquake resistance function can be set on a fixed pier of the continuous beam. In the present application, high-friction seismic isolation bearings are set on at least two middle piers of the continuous beam, so that multiple middle piers can play the role of fixed piers at the same time, thereby improving the seismic isolation effect while reducing the stress on a single pier body, and further optimizing the size of the piers.

[0070] In summary, in the technical solution of the present invention, since high-friction-resistance seismic isolation bearings are symmetrically arranged on at least two middle piers, fixed bearings are omitted, so that the temperature span of a 3-span or 5-span continuous beam can be changed from asymmetric to symmetrical, which greatly reduces the temperature span of the continuous beam, thereby reducing the use of rail expansion and contraction adjusters, avoiding the disadvantages of using rail expansion and contraction adjusters, and further increasing the application scope of large-span continuous beam structures in seamless lines. In addition, by reasonably optimizing the structure of high-friction-resistance seismic isolation bearings, the size and mass of the bearings can be reduced, the durability and economy can be improved, and the bearings can also have seismic isolation functions, so that the connecting beam structure is optimized in both overall and functional aspects.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A continuous beam structure, characterized in that: include: The beam body, two side piers, at least two middle piers, two longitudinal movable bearings and at least two high friction reduction and seismic isolation bearings; The two side piers are respectively arranged at the bottom of both ends of the beam body; The middle pier is symmetrically arranged at the bottom of the beam body between the two side piers; The longitudinal movable support is arranged between the top end of the side pier and the bottom end of the beam body; The high friction damping and seismic isolation bearing is arranged between the top end of the middle pier and the bottom end of the beam body; The high friction damping and seismic isolation bearing comprises: an upper bearing plate, a lower bearing plate, an intermediate lining plate, a plane friction pair, a spherical friction pair and two limit blocks; The top of the upper support plate is fixedly connected to the bottom of the beam body, and the bottom of the lower support plate is fixedly connected to the top of the middle pier; The middle lining plate is arranged between the upper support plate and the lower support plate; The plane friction pair is arranged between the top surface of the middle lining plate and the bottom surface of the upper support plate; The spherical friction pair is arranged between the bottom surface of the middle lining plate and the top surface of the lower support plate; The two limit blocks are respectively located on both sides of the top of the lower support plate and fixed on the bottom surface of the upper support plate, and there is a preset first distance between the limit blocks and the outer side surface of the top of the lower support plate, and the top surface of the lower support plate is higher than the bottom surface of the limit blocks; Wherein, the upper surface of the planar friction pair is provided with grooves to increase the friction coefficient to 0.2≤u<0.

3.

2. The continuous beam structure according to claim 1, characterized in that: The plane friction pair and the spherical friction pair of the high-friction damping and seismic isolation support are both made of alloy.

3. The continuous beam structure according to claim 1, characterized in that: The limit stop block and the upper support plate are connected by bolts, wherein the bolts are special thin nut bolts, and corresponding bolt holes are respectively provided on the limit stop block and the upper support plate. The special thin nut bolt passes through the bolt hole on the limit stop block and is inserted into the bolt hole of the upper support plate. The special thin nut bolt is connected to the bolt hole of the upper support plate by threads, and the special thin nut bolt and the bolt hole of the limit stop block are connected by interference fit.

4. The continuous beam structure according to claim 3, characterized in that: The limit stopper and the upper support plate are further connected via a pin shaft, and corresponding pin shaft holes are respectively provided on the limit stopper and the upper support plate, and the limit stopper and the upper support plate are further connected via the matching connection between the pin shaft and the pin shaft hole.

5. The continuous beam structure according to claim 1, characterized in that: The top surface of the middle lining plate and the bottom surface of the upper support plate are both planes, the bottom surface of the middle lining plate is a convex surface, and the top surface of the lower support plate is a concave surface, and the convex surface of the middle lining plate matches the concave surface of the lower support plate.

6. The continuous beam structure according to claim 1, characterized in that: The upper support plate is fixedly connected to the bottom end of the beam body through a beam bottom anchoring device; the lower support plate is fixedly connected to the top end of the middle pier through a pier top anchoring device.

7. The continuous beam structure according to claim 2, characterized in that: A first sealing ring is provided at the outer edge between the top surface of the middle lining plate and the bottom surface of the upper support plate on the outer side of the planar friction pair; a second sealing ring is provided at the outer edge between the bottom surface of the middle lining plate and the top surface of the lower support plate on the outer side of the spherical friction pair.

8. The continuous beam structure according to claim 1, characterized in that: The engraving is wavy.

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