A gravity anti-overturning device suitable for single-column pier bridges

Abstract

The present invention discloses a gravity-type anti-overturning device suitable for a single-column pier bridge, comprising a steel corbel, a fixed hinge support, a tie rod, a lead column and a square block; the steel corbel is fixed on the side of the pier, the square block is a square structure with a hollow top opening, and its bottom is fixed to the top of the steel corbel; the lead column is placed inside the cavity of the square block; one end of the tie rod is connected to the top of the lead column, and the other end is hinged to the fixed hinge support; the fixed hinge support is fixed on both sides of the bottom of the beam body. The present invention not only has good anti-overturning performance, but also relies on the gravity of the lead column itself and the support force of the lead column on the other side to the tie rod to balance the eccentric load on the bridge support to avoid the support from being emptied, and can well adapt to the rotation of the beam body, and does not cause additional bending moment damage to the bridge and the device itself; in addition, the present invention has a simple structure, convenient construction and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a gravity-type anti-overturning device suitable for a single-column pier bridge. Background Art

[0002] At present, in order to improve the anti-overturning capacity of single-column pier bridges and enhance their lateral stability, the main measures taken in my country are: changing the bridge structure, adjusting the eccentricity of the middle pier support, and adding upper and lower structure connection devices. For existing single-column pier bridges, it is not easy to adjust the eccentricity of the middle pier support. Generally, the bridge is strengthened by changing the bridge structure to improve its anti-overturning stability. The reinforcement measures mainly include: adding columns next to the original pier or adding cap beams on the top of the original pier columns. However, this method has a long construction period and is difficult to construct. Compared with changing the bridge structure, adding upper and lower structure connection devices is easier to implement. This method uses the vertical bearing capacity of the connection device itself to resist the vertical negative reaction force of the bridge support under the action of live load, avoiding the emptying of the support. It has the advantages of simple construction, space saving and material saving, but this connection device cannot adapt well to the rotation of the beam body during the overturning process, which will cause excessive bending moment to the device itself, and will also generate a large additional force on the bridge, thereby causing damage to the device and the bridge itself.

[0003] In view of the above shortcomings, it is necessary to design and develop a new type of anti-overturning device for single-column pier bridges, which can not only adapt to the rotation of the beam during the overturning process and improve the anti-overturning ability of the single-column pier bridge, but also is easy to construct, saves space and materials, and has good economy. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a gravity-type anti-overturning device suitable for single-column pier bridges to prevent the single-column pier beam from rotating excessively to one side under eccentric load and overload conditions and causing overturning, thereby preventing the bearings from becoming empty; the eccentric load on the beam is balanced by the larger gravity of the lead column itself, thereby reducing the bending moment on the beam and the bridge bearings on the eccentric load side and avoiding damage to the beam and the bearings; the top of the pull rod and the rotating hinge connection can rotate freely to adapt to the rotation of the beam, without applying additional bending moment to the device and the bridge itself, thereby protecting the bridge and the device itself.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A gravity-type anti-overturning device suitable for a single-column pier bridge comprises a steel corbel, a fixed hinge support, a pull rod, a lead column and a square block; the steel corbel is fixed on the side of the pier, the square block is a hollow square structure with an open top, and its bottom is fixed to the top of the steel corbel; the lead column is placed inside the cavity of the square block; one end of the pull rod is connected to the top of the lead column, and the other end is hinged to the fixed hinge support; the fixed hinge support is fixed on both sides of the bottom of the beam body.

[0007] The steel corbel comprises a steel corbel top plate, a steel corbel inner plate, a steel corbel bottom plate and a steel corbel web plate. The steel corbel inner plate is provided with a plurality of bolt holes for fixing it to the side wall of the pier; one end of the steel corbel top plate is vertically connected to the top of the steel corbel inner plate; the top and bottom ends of the steel corbel bottom plate are respectively welded and fixed to the bottom of the steel corbel top plate and the bottom of the steel corbel inner plate; the two steel corbel web plates are arranged at a certain distance from each other, the steel corbel web plate is vertically arranged, and its top and bottom are respectively fixedly connected to the lower surface of the steel corbel top plate and the upper surface of the steel corbel bottom plate.

[0008] The lead column is a cylindrical structure, and its material is the metallic material lead; two pull rings are fixed at the middle position of the upper surface of the lead column, and the two pull rings are arranged in parallel and separated by a certain distance; a connecting end is provided at the bottom end of the pull rod, and a connecting port is provided on the connecting end, and the connecting port is clamped with the pull ring; when the beam body does not overturn, a gap is provided between the top of the inner ring of the pull ring and the bottom of the connecting port.

[0009] The cross section of the connecting end is an isosceles trapezoidal structure that is narrow at the top and wide at the bottom.

[0010] There is a certain distance between the outer wall of the lead column and the inner wall of the cavity of the square stopper, and the inner cavity depth of the square stopper is higher than the height of the lead column.

[0011] A cavity is formed inside the square stopper, and a rubber buffer pad is arranged on the inner wall of the cavity; the material used for the rubber buffer pad is polyurethane rubber.

[0012] A semi-cylindrical pin head is arranged at the top end of the pull rod, and a through hole for the rotating hinge to pass through is arranged on the side wall of the pin head. The pin head at the top end of the pull rod is hinged to the fixed hinge support through the rotating hinge.

[0013] The fixed hinge support comprises a fixed plate and a rotating hinge, and the two rotating hinges are fixed on the lower surface of the fixed plate; the fixed plate is provided with bolt holes for fixing the fixed hinge support to the bottom of the beam body with bolts.

[0014] The material of the pull rod is steel with high tensile strength.

[0015] The beneficial effects of the present invention are:

[0016] 1) The present invention has good anti-overturning performance. The eccentric load on the bridge support is balanced by the large gravity of the lead column itself, reducing the bending moment on the support; in addition, the design of the trapezoidal connection end at the bottom of the tie rod enables the upper surface of the lead column in the device on the other side to form a support surface for the bottom end of the tie rod when the beam body rotates beyond a certain angle, providing support for the beam body on the side of the eccentric load, preventing the beam body from rotating further, thereby achieving the purpose of preventing the beam body from overturning.

[0017] 2) The present invention will not cause additional bending moment damage to the device and the bridge itself. The fixed hinge support at the top of the tie rod and the bottom of the beam body is connected by a hinge, so that the tie rod can rotate freely to adapt to the rotation of the beam body, without applying additional bending moment to the device and the bridge itself, thus protecting the device and the bridge itself.

[0018] 3) The present invention has a certain earthquake resistance. When the bridge is affected by an earthquake, the lead column inside the square block cavity will vibrate with the bridge pier, reducing the amplitude of the bridge, and at the same time collide with the rubber buffer pad on the inner wall of the cavity to buffer and absorb the vibration energy.

[0019] 4) The present invention has a simple structure, convenient construction, low cost, and can be applied to new or old bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the present invention applied to a single-column pier beam bridge;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 It is a working state diagram of the present invention when the beam body overturns;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the steel corbel structure of the present invention.

[0025] In the figure: 1 steel corbel, 2 fixed hinge support, 3 pull rod, 4 lead column, 5 square stopper, 6 fixed plate, 7 fixed plate bolt, 8 rotating hinge, 9 trapezoidal connecting end, 10 connecting port, 11 pull ring, 12 steel corbel top plate, 13 steel corbel inner plate, 14 steel corbel web plate, 15 steel corbel bottom plate, 16 steel corbel side plate bolts, 17 rubber buffer pad, 18 gap, 19 bridge movable bearing, 20 bridge pier, 21 beam body. DETAILED DESCRIPTION

[0026] The present invention is further described below:

[0027] See also Figure 1-5 ,

[0028] The present invention discloses a gravity-type anti-overturning device suitable for a single-column pier bridge, comprising a steel corbel 1, a fixed hinge support 2, a pull rod 3, a lead column 4 and a square stopper 5; the steel corbel 1 is fixed on the side of the pier 20, the square stopper 5 is a hollow square structure with an open top, and its bottom is fixed to the top of the steel corbel 1; the lead column 4 is placed inside the cavity of the square stopper 5; one end of the pull rod 3 is connected to the top of the lead column 4, and the other end is hinged to the fixed hinge support 2; the fixed hinge support 2 is fixed on both sides of the bottom of the beam body 21.

[0029] The steel corbel 1 comprises a steel corbel top plate 12, a steel corbel inner plate 13, a steel corbel bottom plate 15 and a steel corbel web 14. The steel corbel inner plate 13 is provided with a plurality of bolt holes for fixing it to the side wall of the pier 20; one end of the steel corbel top plate 12 is vertically connected to the top of the steel corbel inner plate 13; the top and bottom ends of the steel corbel bottom plate 15 are respectively welded and fixed to the bottom of the steel corbel top plate 12 and the bottom of the steel corbel inner plate 13; the two steel corbel webs 14 are arranged at a certain distance from each other, the steel corbel web 14 is vertically arranged, and the top and bottom thereof are respectively fixedly connected to the lower surface of the steel corbel top plate 12 and the upper surface of the steel corbel bottom plate 15.

[0030] The lead column 4 is a cylindrical structure, and its material is the metallic material lead; two pull rings 11 are fixed at the middle position of the upper surface of the lead column 4, and the two pull rings 11 are arranged in parallel and separated by a certain distance; the bottom end of the pull rod 3 is provided with a connecting end 9, and the connecting end 9 is provided with a connecting port 10, and the connecting port 10 is clamped with the pull ring 11; when the beam body 21 does not overturn, a gap 18 is provided between the top of the inner ring of the pull ring 11 and the bottom of the connecting port 10, so as to ensure that the bridge superstructure can be freely deformed at this location under the conditions of temperature change, concrete shrinkage and creep, and no additional internal force is generated on the beam body 21.

[0031] The cross-section of the connecting end 9 is an isosceles trapezoidal structure that is narrow at the top and wide at the bottom. When the beam body 21 is unbalanced, the bottom of the connecting end 9 on the unbalanced side contacts the top of the lead column 4 to support the beam body 21 on the unbalanced side. The isosceles trapezoidal structure of the connecting end 9 makes the contact area between its bottom and the top of the lead column 4 larger and can provide more stable support for the beam body 21.

[0032] There is a certain distance between the outer wall of the lead column 4 and the inner wall of the cavity of the square stopper 5 , and the inner cavity depth of the square stopper 5 is higher than the height of the lead column 4 .

[0033] A cavity is formed inside the square stopper 5, and a rubber buffer pad 17 is provided on the inner wall of the cavity; the rubber buffer pad 17 is made of polyurethane rubber to absorb earthquake energy.

[0034] A semi-cylindrical pin head is provided at the top of the pull rod 3, and a through hole for the rotating hinge 8 to pass through is provided on the side wall of the pin head. The top pin head of the pull rod 3 is hinged to the fixed hinge support 2 through the rotating hinge 8, so that the pull rod 3 can rotate freely to adapt to the rotation of the beam body 21, without applying additional bending moment to the device and the bridge itself, thereby protecting the device and the bridge itself.

[0035] The fixed hinge support 2 includes a fixed plate 6 and a rotating hinge 8, and the two rotating hinges 8 are fixed on the lower surface of the fixed plate 6; the fixed plate 6 is provided with bolt holes for fixing the fixed hinge support 2 to the bottom of the beam body 21 with bolts 7.

[0036] The material of the pull rod 3 is steel with high tensile strength and can withstand a large tensile force.

[0037] Working principle: 1. Under normal circumstances, there is a reserved gap 18 between the connection port 10 at the bottom of the tie rod 3 and the pull ring 11 on the upper surface of the lead column 4. The tie rod 3 does not exert a tensile force on the lead column, which is used to ensure that the bridge superstructure is free to displace at this location under temperature changes, concrete shrinkage and creep, and does not generate additional internal forces on the beam body 21. 2. Under a relatively small eccentric load, when the relative vertical displacement caused by the rotation of the beam body 21 exceeds the reserved gap 18 between the tie rod 3 and the lead column 4, the connection port 10 contacts the pull ring 11 and exerts a tensile force on it. The tie rod 3 begins to pull the lead column 4 upward as the beam body 21 rotates, relying on the larger gravity of the lead column 4 itself to balance the eccentric load on the bridge support 19 and reduce the influence of the bending moment on the support. 3. Under the action of a larger eccentric load, the beam body 21 rotates significantly and the lead column 4 is pulled up. At this time, in addition to the gravity of the lead column 4 balancing a part of the eccentric load on the movable bearing 19 of the bridge, the upper surface of the lead column 4 in the device on the other side contacts with the bottom end of the pull rod 3 and forms a supporting surface for it, providing support for the beam body on the eccentric load side, limiting the continued rotation of the beam body 21, preventing the movable bearing 19 of the bridge from being emptied, and thus avoiding the overturning of the bridge.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A gravity anti-overturning device suitable for a single-column pier bridge, characterized in that: The invention comprises a steel corbel (1), a fixed hinge support (2), a tie rod (3), a lead column (4) and a square stopper (5); the steel corbel (1) is fixed on the side of the bridge pier (20); the square stopper (5) is a square structure with a hollow top and an open top, and its bottom is fixed to the top of the steel corbel (1); the lead column (4) is placed inside the cavity of the square stopper (5); one end of the tie rod (3) is connected to the top of the lead column (4), and the other end is hinged to the fixed hinge support (2); the fixed hinge support (2) is fixed to both sides of the bottom of the beam body (21); the lead column (4) is a cylindrical structure, and its material is the metal material lead; the middle position of the upper surface of the lead column (4) is fixed There are two pull rings (11), which are arranged in parallel and at a certain distance from each other; the bottom end of the pull rod (3) is provided with a connecting end (9), and the connecting end (9) is provided with a connecting port (10), and the connecting port (10) is clamped with the pull ring (11); when the beam body (21) does not overturn, a gap (18) is provided between the top of the inner ring of the pull ring (11) and the bottom of the connecting port (10); the cross-section of the connecting end (9) is an isosceles trapezoidal structure that is narrow at the top and wide at the bottom; there is a certain distance between the outer wall of the lead column (4) and the inner wall of the cavity of the square stopper (5), and the inner cavity depth of the square stopper (5) is higher than the height of the lead column (4).

2. A gravity anti-overturning device suitable for a single-column pier bridge according to claim 1, characterized in that: The steel corbel (1) comprises a steel corbel top plate (12), a steel corbel inner plate (13), a steel corbel bottom plate (15) and a steel corbel web plate (14); the steel corbel inner plate (13) is provided with a plurality of bolt holes for fixing the steel corbel to the side wall of the pier (20); one end of the steel corbel top plate (12) is vertically connected to the top of the steel corbel inner plate (13); the top and bottom ends of the steel corbel bottom plate (15) are respectively welded and fixed to the bottom of the steel corbel top plate (12) and the bottom of the steel corbel inner plate (13); the two steel corbel web plates (14) are arranged at a certain distance from each other, the steel corbel web plates (14) are vertically arranged, and the top and bottom of the steel corbel top plate (12) and the upper surface of the steel corbel bottom plate (15) are respectively fixed and connected to the lower surface of the steel corbel top plate (12) and the upper surface of the steel corbel bottom plate (15).

3. The gravity anti-overturning device suitable for a single-column pier bridge according to claim 1, characterized in that: A cavity is formed inside the square stopper (5), and a rubber buffer pad (17) is provided on the inner wall of the cavity; the material used for the rubber buffer pad (17) is polyurethane rubber.

4. The gravity anti-overturning device for a single-column pier bridge according to claim 1, characterized in that: A semi-cylindrical pin head is provided at the top end of the pull rod (3), and a through hole for a rotary hinge (8) to pass through is provided on the side wall of the pin head. The pin head at the top end of the pull rod (3) is hinged to the fixed hinge support (2) via the rotary hinge (8).

5. The gravity anti-overturning device suitable for a single-column pier bridge according to claim 1, characterized in that: The fixed hinge support (2) comprises a fixed plate (6) and a rotary hinge (8), wherein the two rotary hinges (8) are fixed to the lower surface of the fixed plate (6); the fixed plate (6) is provided with bolt holes for fixing the fixed hinge support (2) to the bottom of the beam body (21) with bolts (7).

6. The gravity anti-overturning device for a single-column pier bridge according to claim 1, characterized in that: The material of the pull rod (3) is steel with high tensile strength.

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