Patent Application
20220081854
The present invention relates to a wedge-shaped pushing device for bridge and its construction method, and more particularly to the wedge-shaped pushing device for bridge and the construction method which are applied for displacing or pushing large steel bridges or prestressed concrete box girders and have the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety.
In present large steel bridges or prestressed concrete box girders used for displacement and pushing, the box girder usually comes with a heavy weight over thousands of metric tons and thus cannot be moved by crane. Most of them adopt a push-pull method and use a temporary pier, lifter and rail to push, drag, or slide the box girder on a rail to a desired installation position.
However, the box girder uses the lifter to pull a steel cable to set a translational rail slip during the displacement and pushing. Due to the large friction force produced while pushing the static box girder, it needs more power for the traction and a larger horizontal force to overcome the static friction during the pushing and dragging operation. The temporary pier needs to be set separately, and the support of greater rigidity and the traction can be adjusted at any time, while each support point of the temporary pier or pier may be exerted with uneven forces and horizontal overloads that may crack the concrete of the piers, damage the equipment, or cause other issues that may affect the stability and safety of the pier structure for displacing and pushing the box girder.
Therefore, it is a primary objective of the present invention to provide a wedge-shaped pushing device for bridge and its construction method to achieve the effects of displacing and pushing the box girder, lowering the construction cost, facilitating the installation, and improving the stability and safety.
The foregoing and other objectives of the invention are realized with a wedge-shaped pushing device for bridge that includes: a base, a lifter and a pushing mechanism, wherein the base has a platform disposed at a top side thereof, and the platform has a wedge-shaped block disposed on a side of the platform, and the top side forms an upper slope, and the bottom side is substantially in in horizontal shape and attached closely with the platform; the lifter has a pad disposed at the top end thereof; the pushing mechanism is installed on the other side of the platform and has an upper wedge-shaped seat, a plurality of hydraulic cylinders and a support seat, and the top side of the upper wedge-shaped seat has a cushion, and the bottom side of the upper wedge-shaped seat forms a lower slope, and the angle of the lower slope is matched with the angle of the upper slope; the hydraulic cylinder has a piston rod with an end coupled to the upper wedge-shaped seat; and an upper end of the support seat is fixed and combined with the hydraulic cylinder by a pivot, and the bottom of the support seat is attached closely with the platform.
According to the above-mentioned wedge-shaped pushing device for bridge, wherein the base, the wedge block, the pad and the support seat are made of a cement concrete material.
According to the above-mentioned wedge-shaped pushing device for bridge, wherein the base, the wedge block, the pad and the support seat are made of a metal material.
According to the above-mentioned wedge-shaped pushing device for bridge, wherein the cushion is made of a rubber material.
The other objective of the invention is to provide a wedge pushing construction method for bridge that comprises the steps of:
(a) setting a wedge-shaped pushing device under a box girder;
(b) adjusting a lifter to ascend and prop up the box girder;
(c) pushing the upper wedge-shaped seat onto the wedge-shaped block by a piston rod of a hydraulic cylinder, such that a lower slope and an upper slope are attached with each other, and a pad and a cushion are substantially leveled to support the box girder; and
(d) adjusting the lifter to descend, supporting the box girder by a cushion, pressing and controlling the hydraulic cylinder by the weight of the box girder to support the upper wedge-shaped seat, and sliding down the upper wedge-shaped seat along the upper slope in order to displace and push the box girder.
According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the wedge block and the pad are made of a cement concrete material.
According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the wedge block and the pad are made of a metal material. According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the cushion is made of a rubber material.
Based on the above arrangement, the box girder can be displaced and pushed by the device to achieve the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety of displacing and pushing the box girder.
The adopted technical means and achievable effects of the present invention will be apparent with the detailed description accompanied with related drawings of preferred embodiments as follows.
With reference to
a lifter 3 (such as a jack), having a pad 30 at its top end, and the pad 30 is made of a cement concrete or a metal material and can increase the support area; and
a pushing mechanism 4, installed on the other side of the platform 20, and having an upper wedge-shaped seat 40, a plurality of hydraulic cylinders 41 and a support seat 42, and the top side of the upper wedge-shaped seat 40 having a cushion 43 made of a rubber material and capable of reducing the impact force of the weight, and the bottom side being formed into a lower slope 44, and the angle of the lower slope 44 being matched with the angle of the upper slope 22; and the hydraulic cylinder 41 having a piston rod 45 with an end coupled to the upper wedge-shaped seat 40; the support seat 42 having a top end fixed and combined with the hydraulic cylinder 41 by a pivot 46 and a bottom closely attached with the platform 20, and the pivot 46 being adjustable according to the angle of elevation of the hydraulic cylinder 41.
In
With reference to
A circuit control is electrically connected to the lifter 3 and the hydraulic cylinder 41 for synchronous operations. When the weight of the box girder A presses and controls the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, the upper wedge-shaped seat 40 slides down along the upper slope 22 to displace and push the box girder A, so as to achieve the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety of displacing and pushing the box girder A.
In summation, the present invention has the following advantages:
1. The wedge-shaped pushing devices 1 are set under the box girder A without requiring any rail or temporary pier, and the wedge-shaped pushing device 1 has the features of simple structure, convenient installation and moving, low construction cost, and reduced construction time.
2. The piston rod 45 of the hydraulic cylinder 41 is used to push the upper wedge-shaped seat 40 onto the wedge-shaped block 21, so that the lower slope 44 and the upper slope 22 are attached to each other, so that the bearing capacity and stability of pressing by the weight of the box girder A are improved.
3. The weight of the box girder A presses and controls the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, and the upper wedge-shaped seat 40 slides down along the upper slope 22, so that the stability and safety of displacing and pushing the box girder A are improved.
While the present invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claim.
| Number | Date | Country | Kind |
|---|---|---|---|
| 109131875 | Sep 2020 | TW | national |
