KR200243092Y1 - A jack structure for bridge assembly up and down - Google Patents

Abstract

The present invention relates to a jack for elevating a bridge superstructure, and to enable a stable maintenance of the bridge through a jack for lifting the upper structure at the time of repair and replacement of each component of the bridge.

Lift jacks of the present invention for realizing this, the cylinder housing (1) where the piston rod (4) is seated so as to be able to flow up and down in a predetermined section, the upward pressure to the lower side and the upper side of the piston rod (4) And fluid inlet holes 2 and 3 for applying a downward pressure are formed therethrough, respectively; Inner rod 6 is fixedly installed at the center of the cylinder housing 1 to guide the flow of the piston rod 4, and the inner rod 6 is in communication with the fluid inlet hole 3 of the one side, thereby providing fluid. A fluid guide hole 3a for guiding the to the upper side of the piston rod 4; The support (7) is fixed to the upper portion of the piston rod (4) is coupled to the support (7) for supporting the upper structure 10 by the fixing bolt (8) to be able to rotate within a predetermined angle range; Through this, it is possible to greatly reduce the working time and the number of people by allowing simple and easy installation on the pier at the time of repair of the bridge.

Description

Jacks for lifting bridge superstructures {A JACK STRUCTURE FOR BRIDGE ASSEMBLY UP AND DOWN}

The present invention relates to a jack for elevating, and more particularly to a lifting jack for lifting and supporting the superstructure during the maintenance and replacement of each component of the old bridge.

In general, bridges can be roughly divided into overpasses or bridges that are constructed across rivers. These bridges are constructed in various forms and structures considering structural dynamics as civil structures.

One of such bridges is to install the bridge device on the supporting surface of both sides of the bridge, the upper middle of which is partitioned as a chest wall, and the upper structure consisting of the girder and the upper plate is installed so as to span the top of the bridge through the bridge device, and then applied after construction. Bridges have been known to be constructed to allow expansion or contraction of the superstructure depending on the stretch stresses.

When such bridges are naturally aged with the passage of time after installation, or if cracks or breakage occur in bridges, superstructures, bridges, etc. due to artificial factors, the upper structures over the bridges are lifted as lifting jacks and then cracked. The repair and replacement of each component of the bridge where the damage occurred was performed.

That is, in elevating the upper structure for the repair work of the bridge as described above, the girder of the upper structure as a jack jack for lifting and lowered in the space between the supporting surface of both sides partitioned by the chest wall on the top of the bridge and the girder of the upper structure Under the condition, the lifting jack was operated to lift the upper structure with the supporting surface of the upper part of the pier as the supporting point, thereby repairing and replacing the upper structure, the bridge device, etc. of the bridge in which the crack or damage occurred.

As such, in order to lift the upper structure as the jack for lifting during repair or replacement of the bridge, there is a need to secure a space in which the jack for lifting can be installed between the supporting surfaces on both sides of the upper part of the bridge and the upper structures. Bridges that do not have enough space for lifting jacks between the supporting surfaces and upper structures on both sides of the pier have suffered many difficulties in repairing or replacing each component.

In order to overcome the above-mentioned problems, it has been recently attempted, and it is installed on both side walls of the pier at the time of repairing the bridge where the space for installation of the jack for lifting is not secured between the supporting surfaces on both sides of the pier and the upper structure. By installing the brackets so as to secure a certain space between the upper structure and the lifting jacks placed on the brackets to lift the upper structure, the lifting operation of the upper structure in accordance with the bridge repair relatively simple, easy It is true that it has the advantages to be implemented.

However, such a bracket is installed to be supported on both sides of the pier as anchor bolts bored in the piers and buried, so that the bracket supported by the buried anchor bolts can not bear the weight load acting, the weight of the superstructure There was an unsuitable shortcoming as a means of supporting jacks for lifting.

In addition, different attempts have been made to repair bridges in which space for the installation of jacks for lifting is not secured between the supporting surfaces on both sides of the pier and the upper structure, and is assembled from the ground on both sides of the pier to the upper structure. Temporary supports were installed to secure a certain amount of space, so that the superstructures could be lifted as jacks for lifting, which were placed through the temporary supports.

However, this requires unnecessarily much work time and manpower to assemble and install the temporary support itself, which extends the construction period due to the bridge repair work and increases the construction cost, thereby improving the efficiency and economic efficiency of the bridge repair. There was a flaw deteriorating.

In particular, when the bridge to be repaired is an overpass that is constructed on the road, the temporary supports, which are assembled from the ground and assembled on both sides of the bridge, occupy the roads on both sides of the bridge, thereby increasing traffic problems in the downtown. In the case of a bridge constructed across this river, there was a drawback in that the installation jack of the temporary support was practically impossible and the lifting jack could not be used.

The present invention has been proposed to solve the above-mentioned problems, and to provide a lifting hydraulic jack structure that can be installed in a narrow space between the bridge pedestal and the upper structure to improve the work efficiency according to the repair work of the bridge. There is this.

The above object is, the cylinder housing in which the piston rod which can be flowed up and down in a predetermined section is provided with a plurality of fluid inlet holes for applying upward pressure and downward pressure to the lower side and the upper side of the piston rod, respectively; An inner rod penetrating the piston rod is fixed to the center of the cylinder housing, and the inner rod communicates with the fluid inlet hole to form a fluid guide hole for applying a downward pressure to the upper side of the piston rod; The upper portion of the piston rod is a support for supporting the upper structure is coupled by a fixing bolt to be able to rotate within a predetermined angle range; it can be made through the bridge upper structure lifting jack.

1 is a cross-sectional view of the jack for lifting the invention.

2 is a state diagram at the time of initial rise of the jack for lifting.

Figure 3 is a state diagram to achieve a stable support by lowering the fixing nut after the upward operation.

Figure 4 is a state diagram during the lowering operation of the jack for lifting.

<Explanation of symbols for the main parts of the drawings>

1: Cylinder housing 2,3: Fluid inlet hole

3a: fluid guide hole 4: piston rod

5: road cover 6: inner rod

7: support 8: fixing bolt

9: washer 10: superstructure

11: fixing part 12: fixing nut

13,14: O-ring

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, looking at the configuration of the lifting hydraulic jack of the present embodiment through the cross-sectional view of FIG.

In the cylinder housing 1 serving as the main body, the piston rod 4 is seated in a state capable of vertical flow, but the piston rod 4 is lifted by the rod cover 5 coupled to the upper end of the cylinder housing 1. At the same time the height is limited and departure to the outside is prevented. In the lateral position of the cylinder housing 1, the fluid inflow holes 2 and 3 for applying the up and down pressure to the lower side and the upper side of the piston rod 4 were formed, respectively.

In addition, an inner rod 6 is fixed to the center of the cylinder housing 1 through the piston rod 4 to guide the up and down flow of the piston rod 4. The inner rod 6 is fixed to the inner rod 6. The fluid guide hole 3a for guiding the fluid introduced by communicating with the fluid inlet hole 3 on one side to the upper side of the piston rod 4 is formed.

The upper portion of the piston rod (4) is fixed to the fixing portion 11 is integrally fixed, and the fixing portion (11) for supporting the bridge upper structure (10) by the fixing bolt (8) Combined.

At this time, the fixing bolt (8) coupling hole of the support (7) has an upper structure 10 by forming a tapered surface (7a) to increase the inner diameter gradually toward the bottom at the same time to leave a space for loose coupling between each other Rotating a predetermined angle of the support (7) to be able to meet the horizontal state of the), the fixing bolt (8) to prevent damage due to the concentrated pressure of the coupling part when the support (7) flows to a specific site Washer 9 was inserted.

In addition, the fixing nut 12 is coupled to the upper outer peripheral side of the piston rod 4 by a screwing engagement so as to be able to flow up and down, so as to serve as a locking jaw with the cylinder housing 1.

In the drawings, reference numerals 13 and 14 denote O-rings for maintaining airtightness, respectively.

An operational state of the present invention constituting such a configuration will be described with reference to FIGS. 2 to 4.

That is, the high pressure pumped from the pump (not shown) through the fluid inlet hole 2 after the stable jack of the lifting jack of the present invention for lifting the upper structure 10 during the repair and replacement of the bridge components When the working fluid of the piston rod 4 is gradually raised, accordingly, the fixing portion 11 and the support 7 are raised together to lift and support the upper structure 10 in the form as shown in FIG. do.

At this time, it can be seen that when the upper structure 10, which had been horizontal, achieved a predetermined inclination angle according to the ascending operation, the support 7 could also achieve the state in which the upper structure of the bridge was lifted while forming the same inclination.

In this state, repair or replacement of the bridge can be performed. At this time, if the fixing nut 12 located on the upper portion of the piston rod 4 is rotated to one side, the fixing nut 12 is shown in FIG. 3. As it is fastened down and performs a locking step action with the cylinder housing (1) it is possible to more stably support the raised state of the piston rod (4). This is to prevent the lowering of the piston rod 4 even if the fluid pressure is reduced when the internal airtightness is broken due to leakage of fluid or other internal and external shocks.

Thereafter, when the bridge is completed and the upper structure 10 to be raised is to be returned to its original position, the fixing nut 12 is rotated in the reverse direction to be raised to the original position, and in this state, the fluid inflow hole 2 of the other side is returned. While releasing the pressure hanging on the side, when a fluid having a constant pressure is introduced through the fluid inlet hole 3 on one side, the introduced fluid is introduced through the fluid guide hole 3a formed in the inner rod 6. The downward pressure is applied to the piston rod 4 by being guided to the upper side of the piston rod 4.

By the lowering pressure, the fluid that is pushed to the lower side of the cylinder housing 1 is discharged again, and the piston rod 4 descends to achieve the original position as shown in FIG. 3.

Therefore, it can be seen that the use of the jack for lifting can lift the upper structure during repair and replacement of the bridge can significantly reduce the working time and the workforce.

In addition, although specific embodiments of the present invention have been described above, it is obvious that the lifting jack structure of the present invention may be variously modified and implemented by those skilled in the art.

However, such modified applications should not be individually understood from the technical spirit or prospect of the present invention, and other modified embodiments should fall within the appended utility model claims of the present invention.

The present invention as described above, through the jacks for lifting the upper structure at the time of repair and replacement of each component of the bridge exhibits the effect of making it possible to stably perform the repair work of the bridge.

In addition, as a compact structure that can be easily and easily installed in the pier at the time of repair of the bridge, it can exhibit the advantage of significantly reducing the work time and the number of people.

Claims (3)

A fluid inlet hole 2 for applying a rising pressure and a lowering pressure to a lower side and an upper side of the piston rod 4 in the cylinder housing 1 in which the piston rod 4 is seated to be able to flow up and down in a predetermined section. 3) are each formed through; Inner rod 6 is fixedly installed at the center of the cylinder housing 1 to guide the flow of the piston rod 4, and the inner rod 6 is in communication with the fluid inlet hole 3 of the one side, thereby providing fluid. A fluid guide hole 3a for guiding the to the upper side of the piston rod 4; The support (7) is fixed to the upper portion of the piston rod (4) is coupled to the support (7) for supporting the upper structure 10 by the fixing bolt (8) to be able to rotate within a predetermined angle range; Jack for lifting the bridge superstructure, characterized in that. The method according to claim 1, The fixing nut 12 is coupled to the outer peripheral side of the upper end of the piston rod 4 by a screw-to-thread, so as to be able to flow up and down, and is provided to serve as a locking jaw with the cylinder housing 1. Jack for lifting bridge superstructures. The method according to claim 1, The through-hole of the support 7 to which the fixing bolt 8 is coupled forms a tapered surface 7a whose inner diameter is gradually increased toward the lower end, so that the support 7 can be rotated within a predetermined angle range. Become; The fixed bolt (8) jacks for lifting the upper bridge structure, characterized in that the washer (9) is inserted so that the pressing force transmitted from the coupling portion in accordance with the rotation of the support (7) is inserted.