KR102629801B1 - Computer controlled impression device using hydraulic jack with automatic safety device and bridge jack up method using the same - Google Patents

Abstract

The present invention is a computer-controlled lifting device that includes a hydraulic jack equipped with an automatic safety device that can be easily lowered by its own weight when the piston is lowered, which can improve work safety and convenience by repeatedly raising and supporting force when the piston rises, and It relates to a bridge raising method using this. It consists of a hydraulic jack, a hydraulic supply unit, and a computer control unit that generate lift and support when the piston rises. When the bridge is raised, the cylinder in the cylinder body is repeatedly moved and supported by the operating piece. In addition to the safety of work, safety and workability can be improved even in the event of a hydraulic supply problem. When the piston is lowered after rising from the cylinder body, the piston can be easily lowered with a simple operation of the operator operating the operating pin. Performance and operator convenience can be improved, and a cam is formed on the handle that constitutes the operating pin that separates the operating piece from the piston, so that even if the operator does not continuously pull the operating pin, the second locking portion of the operating piece becomes the first locking portion of the piston. Provided is a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device that can improve workability and operator convenience by maintaining a spaced apart state, and a bridge lifting method using the same.

Description

Computer controlled impression device using hydraulic jack with automatic safety device and bridge jack up method using the same}

The present invention is a computer-controlled lifting device that includes a hydraulic jack equipped with an automatic safety device that can be easily lowered by its own weight when the piston is lowered, which can improve work safety and convenience by repeatedly raising and supporting force when the piston rises, and This is about a bridge raising method using this.

Generally, a bridge is composed of structures such as a bridge beam and a deck installed over the upper part of a pier, and the bridge deck and beam can expand or contract according to the expansion stress applied after installation. A fixed bridge or a vibration-absorbing composite bridge device is installed between operations, and as time passes after installation, the bridge structure or bridge device is often damaged due to various types of natural or artificial factors. For example, corrosion or destruction of the bridge device due to water leakage from the joint part of the bridge deck, paralysis of the grease injected into the bridge device, etc. can occur, which can cause cracks in the bridge pier or cracks in the deck and beam. do. In addition to the above examples, in cases where piers settle due to ground subsidence, the position of the deck changes, beams are destroyed by impact loads, the deck partially sinks and a step occurs between decks, the original design load of the bridge is exceeded. Bridges must be repaired due to various factors, such as the lack of cross-section of the bridge suspension system due to the emergence of heavy vehicles and the need to replace the bridge deck.

When repairing a bridge that has been damaged or deformed in this way, the entire or part of the bridge is demolished and restored depending on the degree of damage, or it is restored to its original state through partial repair work. In this way, the entire or part of the bridge structure is demolished and , reconstruction requires a lot of heavy equipment and manpower, which not only results in a huge cost for repair work, but also causes traffic congestion due to closure or detour of vehicle traffic as vehicle traffic becomes impossible until the restoration work is completed. There was this.

Therefore, when repairing a bridge, it is a work of repairing only the area requiring repair by moving it vertically or laterally without demolishing or dismantling the bridge deck or beam structure. A method of repairing the bridge beam or deck by lifting it using a hydraulic jack. This is being used.

In addition, when performing lifting work to lift the bridge upper structure with a hydraulic device for repair or replacement of the bridge device, the edge distance, which is the distance between the bridge device and the end of the pier, which secures space for jack installation when replacing the bridge device, and the beam If the hydraulic jack cannot be installed on the coping due to concerns about problems such as damage to the coping of the bridge due to insufficient space or lack of stress due to lack of space for installing the hydraulic jack in the mold space, which is the distance from the bottom of the bridge to the top of the bridge pier, an attempt is made. There are a variety of construction methods, but existing construction methods not only cause damage to the structure, resulting in additional costs beyond the purpose of repair and reinforcement, but also have the potential to cause defects due to damage in terms of long-term maintenance and management of the bridge structure.

Looking specifically at the problems with the conventional repair method using prefabricated brackets, it can be applied only when a mold space of at least 8 cm and an edge distance of at least 8 cm or more than the reinforcing bar cover are secured during construction, and when a large jacking force is applied, the number of brace plates is limited. Due to the increase, constructability deteriorates during welding, and there is a problem that it cannot be applied to all bridges due to limitations in edge distance and profile space.

In other words, looking at the jack installation standards introduced in the road bridge specifications, the edge distance is 35cm based on a span of 30m when the span length of the beam is 10m or less, and 40cm of girder space must be secured, making realistic application impossible.

In addition, the problems with the conventional cross-sectional enlargement raising method are that it is uneconomical compared to other methods in terms of construction time and construction cost, has poor aesthetics, and causes damage to the existing bridge since anchors are used in the existing bridge and then rebar is placed.

In addition, when the bridge deck was raised using a hydraulic jack and the bridge suspension device was replaced, the hydraulic pressure supplied to the hydraulic jack leaked due to the weight of the bridge deck, resulting in the problem that the originally planned raised height of the bridge deck could not be maintained.

Meanwhile, as described above, technologies to prevent hydraulic pressure from leaking from a hydraulic jack and maintaining the current state include Korea Registered Patent No. 10-038155 (hereinafter referred to as 'Patent Document 1'), Korea Registered Patent No. 10- No. 0797526 (hereinafter referred to as ‘Patent Document 2’) has been proposed.

First, Patent Document 1 forms a screw rod that can be raised and lowered in a hydraulic jack, and forms a lowering prevention means in the form of a nut coupled to the screw rod, so that the lowering prevention means that can maintain the raised state after the screw rod of the hydraulic jack is raised is rotated by the worker. By tightening it, it was possible to achieve the effect of preventing the fixture for raising the bridge deck, etc. from lowering.

In addition, Patent Document 2 states that after raising the bridge deck by raising the lifting bar, which is the piston rod of a hydraulic jack, the operator inserts one or more support plates between the cylinder and the bridge deck to maintain the raised state, so that the lifting bar supports the load of the bridge deck. It was possible to achieve the effect of maintaining the raised height of the bridge deck by preventing it from falling.

Meanwhile, in Patent Documents 1 and 2 as described above, workers are exposed to safety accidents because workers must rotate nuts or combine separate plates to maintain the bridge deck after raising it, especially in unexpected situations. There was a problem that made it difficult to respond immediately when an incident occurred.

That is, a typical hydraulic jack is configured in such a way that the piston rod is raised and lowered by supplying hydraulic pressure to the cylinder.

Therefore, no major problems occur in the process of continuously supplying hydraulic pressure, but if the line supplying hydraulic pressure to the cylinder is disconnected due to the operator's carelessness, or if hydraulic pressure is not supplied due to other reasons, Patent Document 1 , 2 will not be able to respond immediately.

Of course, the problem does not occur until the piston rod raises the bridge deck.

However, if the above problem occurs at the time the bridge deck is raised, if the amount of hydraulic pressure flowing into the cylinder is small, the piston rod of the hydraulic jack will not be able to support the load of the bridge deck, resulting in a rapid descent. As a result, the bridge deck descends, causing damage to the structure.

In other words, in the above-mentioned Patent Documents 1 and 2, the means for additionally supporting the bridge deck in a state in which the bridge deck is completely lifted can be supported only by additional work by the worker, so the lifting work on the bridge deck is not completely completed. In this case, the above problem occurs.

To solve this problem, Republic of Korea Patent No. 10-1704550 (hereinafter referred to as 'Patent Document 3') has been proposed.

Patent Document 3 provides a wedge so that the bridge deck can maintain the planned height even if the supply of hydraulic pressure is blocked through a hydraulic jack including a safety device including a plurality of wedges or if hydraulic leakage occurs due to the load of the bridge deck after the bridge deck is raised. By acting as an additional support, it was possible to smoothly carry out the replacement construction of the abutment device by maintaining the raised height of the bridge deck.

(Patent Document 1) KR10-0538155 B1 Support device and repair method for seat device using the same

(Patent Document 2) KR10-0797526 B1 hydraulic jack structure and replacement construction method for suspension device using the same

(Patent Document 3) KR10-1704550 B1 Damage-free lifting method of bridge deck using hydraulic jack including safety device and computer

However, the above-mentioned patent document 3 does not have a structure that automatically supports the bridge deck, and development thereof is required.

In order to solve the above problems, a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device according to the present invention and a bridge lifting method using the same are used to repeatedly move and support the cylinder in the cylinder body by the operating piece when raising the bridge. The purpose is to provide a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device that can improve the safety and workability even when problems with hydraulic supply occur, as well as the safety of work, and a bridge lifting method using the same. .

Another purpose of the present invention is to improve workability and operator convenience by allowing the piston to be easily lowered by a simple operation of the operator operating the operating pin when the piston is lowered after rising from the cylinder body. .

Another object of the present invention is to form a cam portion on the handle constituting the operating pin that separates the operating piece from the piston, so that the second engaging portion of the operating piece is spaced apart from the first engaging portion of the piston even if the operator does not continuously pull the operating pin. The purpose is to maintain and improve workability and operator convenience.

In the present invention, when raising a bridge, the cylinder is repeatedly moved and supported by the operating piece in the cylinder body, improving the safety of work as well as safety and workability even when problems with hydraulic pressure supply occur.

In addition, when the piston is lowered after rising from the cylinder body, the piston can be easily lowered with a simple operation of the operator operating the operating pin, improving workability and operator convenience.

In addition, a cam part is formed on the handle that constitutes the operating pin that separates the operating piece from the piston, so that the second locking portion of the operating piece remains spaced from the first locking portion of the piston even if the operator does not continuously pull the operating pin, allowing the operation to be performed. It is a useful invention that can improve performance and operator convenience.

Figure 1 is a state diagram showing the installation state of a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device according to the present invention.
Figure 2 is a perspective view of a hydraulic jack in the present invention.
Figure 3 is a front view of Figure 2.
Figure 4 is a cross-sectional view taken along line A-A of Figure 3;
Figure 5 is a cross-sectional view taken along line B-B of Figure 3.

Hereinafter, the present invention will be examined in more detail using the attached drawings.

1. Computer-controlled lifting device including hydraulic jack with automatic safety device

As shown in FIG. 1, the present invention includes a hydraulic jack 100, a hydraulic supply unit 200, and a computer control unit 30.

go. hydraulic jack

First, the hydraulic jack 100 has a cylinder body 110 formed as shown in FIGS. 2 to 5.

The cylinder body 110 has a cylindrical shape, and a cylinder 111 through which hydraulic pressure is introduced is formed in the inner center.

Next, the safety nut portion 120 is configured to be coupled to the upper side of the cylinder body 11 and forms an operating unit coupling groove 121 on the inside, and a first spring coupling groove 122 and a first spring coupling groove 121 on one side. A pin coupling hole 123 is formed.

It is preferable that the first spring coupling grooves 122 are formed in a group of two, and the first pin coupling hole 123 is formed between the first spring coupling grooves 122.

In particular, the safety nut portion 120 in the present invention can be divided in the vertical direction and configured to be joined by a normal bolt (B).

Next, the piston 130 is coupled to the cylinder 111 of the cylinder body 100 and moves up and down by the fluid supplied to the cylinder 111.

This piston 130 is formed with a piston rod 131 coupled to the cylinder 111 of the cylinder body 110, and on the upper side is a bridge top plate 1b that constitutes the bridge 1 when the piston 130 rises. It consists of a contact portion 132 that comes into contact with.

In addition, a first locking portion 134 formed by repeatedly extending a first horizontal locking protrusion h1 and a first inclined surface v1 in the vertical direction is formed on the side of the piston rod 131.

Next, the operating piece 140 is configured to be coupled to the operating portion coupling groove 121 of the safety nut portion 120.

Specifically, it is a configuration that is formed to be smaller than the horizontal size of the operation part coupling groove 121 so that a horizontal sliding movement can be achieved in the operation part coupling groove 121 of the safety nut part 120, and in the inner direction The second horizontal locking protrusion (h2) and the second inclined surface (v2) are vertical to correspond to the first horizontal locking protrusion (h1) and the first inclined surface (v1) of the first engaging portion 134 constituting the piston 130. A second locking portion 144 is formed by repeatedly extending in one direction.

In addition, on the outside, there is a second spring coupling groove 142 corresponding to the first spring coupling groove 122 of the safety nut portion 120, and a second pin fixing hole 143 corresponding to the first pin coupling hole 123. This is formed.

Next, the spring 150 is coupled to the first and second spring coupling grooves 122 and 142 to form an elastic force in the operating piece 140, and normally presses the operating piece 140 inward. The elastic force acts to bring the second locking portion of the operating piece 140 into contact with the first locking portion 134 of the piston 130.

Next, the operating pin 160 is coupled to the above-described safety nut portion 120 and the operating piece 140 and is configured to slide and fix the operating piece 140 in the horizontal direction.

That is, the operating pin 160 is coupled to enable horizontal sliding movement in the first pin coupling hole 123 constituting the safety nut portion 120, and is coupled to the second pin fixing hole of the operating piece 140 ( In 143), it consists of a fixed pin 161 and a handle 162 formed at the end of the pin 161, rotatably coupled with a hinge h, and including a cam portion 162a.

Here, the operating piece 140, spring 150, and operating pin 160, which constitute the hydraulic jack 100, are arranged symmetrically in two places in one set, so that after the piston rises, the handle 162 of the operating pin 160 ), the operating piece 140 can be slid outward to lower the piston 130.

me. Hydraulic supply department

The hydraulic supply unit 200 is configured to supply hydraulic pressure to the hydraulic jack 100 described above, and is configured to supply hydraulic pressure through a normal hydraulic supply line (L).

This hydraulic supply unit 200 is configured to supply hydraulic pressure to the cylinder hydraulic supply port 111 of the cylinder 110 constituting the hydraulic jack 100.

Here, the hydraulic supply unit 200, although not shown in the drawing, may further include a separate valve so that the hydraulic pressure can remain within the hydraulic jack 100 after supplying hydraulic pressure to the hydraulic jack 100.

all. computer control unit

Next, the computer control unit 300 is equipped with a program that can equally raise the height of the bridge deck 1b within a certain range through control of the hydraulic supply unit 200 that supplies the hydraulic jack 100. In particular, although not shown in the drawing, when horizontal sensors, vertical sensors, and position sensors are installed when raising the bridge deck (1b), these sensors can be used to maintain balance when raising the bridge deck (1b) to ensure smooth lifting. You can also do it.

In particular, when the valve installed in the hydraulic supply unit 200 is formed in the form of an electromagnetic valve, it may be configured to control the valve.

The computer control unit 300 as described above can control the hydraulic supply unit 200, which supplies hydraulic pressure to the cylinder 111 when the bridge deck 1b is raised, to raise the piston 130 to raise the bridge deck 1b. It is structured so that

In addition, the computer control unit 300 is configured to control the hydraulic pressure supply unit 200 so that the hydraulic pressure in the cylinder 111 of the cylinder body 110 can be recovered at the same time when the bridge deck 1b is lowered after being raised. .

2. Bridge raising method

Below, we will look at the bridge raising method.

The present invention is a cylinder body in which a cylinder through which hydraulic pressure is drawn inward is formed at the inner center of a pier or abutment constituting a bridge, and is coupled to the upper side of the cylinder body to form an operating unit coupling groove on the inside, and on one side A safety nut portion including a first spring coupling groove and a first pin coupling hole, a piston rod that is coupled to the cylinder of the cylinder body and raised and lowered by hydraulic pressure, and a contact portion formed on the upper side of the piston rod and the A piston is formed on the side of the piston rod and includes a first locking portion formed by repeatedly extending a first horizontal locking protrusion and a first inclined surface in the vertical direction, and is coupled to the operating portion coupling groove of the safety nut portion, wherein the operating portion is coupled. It is formed to be smaller than the horizontal size of the actuating part coupling groove so that sliding movement in the horizontal direction can be achieved in the groove, and in the inner direction, there is a second horizontal locking protrusion corresponding to the first horizontal locking protrusion of the piston and a first inclined surface corresponding to the second horizontal locking protrusion. A second locking portion is formed by repeatedly extending the second inclined surface in the vertical direction, and on the outside, a second spring coupling groove corresponding to the first spring coupling groove of the safety nut part and a second spring coupling groove corresponding to the first pin coupling hole are formed. The operating piece in which the pin fixing hole is formed, the spring coupled to the first and second spring coupling grooves so that the operating piece is pressed in the piston direction, and the first pin coupling hole constituting the safety nut part are coupled to enable horizontal sliding movement, In the second pin fixing hole of the operating piece, a hydraulic jack consisting of a fixed pin and an operating pin formed at the end of the pin and rotatably coupled by a hinge and made of a handle including a cam portion is installed, and hydraulic pressure is supplied to the hydraulic jack. A hydraulic jack installation step equipped with an automatic safety device for installing a hydraulic supply unit and a computer control unit to control the raising height by the bridge deck by raising and lowering the hydraulic jack through the hydraulic quantity control and hydraulic quantity control of the hydraulic supply unit; Using the computer control unit of the computer-controlled lifting device using a hydraulic jack installed in the installation step of the computer-controlled lifting device using a hydraulic jack, hydraulic pressure is supplied to the cylinder of the cylinder body constituting the hydraulic jack to raise the piston to raise the bridge top plate, and then the safety nut is lifted. It may include a bridge deck lifting step of maintaining the raised state of the piston by operating the support portion of the safety nut to contact the contact portion of the piston.

In the computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device according to the present invention configured as described above and the bridge lifting method using the same, the hydraulic jack 100 used when raising the bridge deck 1b is equipped with an automatic stabilizing device. This can be expected to increase safety.

That is, the hydraulic jack 100 in the present invention has a first horizontal locking protrusion (h1) formed on the piston rod 131 constituting the piston 130 when the piston 130 rises when hydraulic pressure is supplied to the cylinder body 110. ) is in contact with the second horizontal locking protrusion (h2) of the operating piece 140, and the process of automatically supporting it is repeated.

Looking at this in detail, before hydraulic pressure is supplied to the cylinder body 110, the first horizontal locking protrusion (h1) of the first locking portion 134 constituting the piston 130 is the second locking protrusion constituting the operating piece 140. The first inclined surface v1 of the first locking portion 134, which is in contact with the second horizontal locking protrusion h2 of the portion 144 and constituting the piston 130, is the second horizontal locking protrusion h2 of the portion 144. It is in contact with the second inclined surface v2 of the engaging portion 144.

More specifically, the operating piece 140 is pressed in the direction of the piston 130 by the elastic force of the spring 150, and the second actuating piece 140 is attached to the first engaging portion 134 of the piston 130 as described above. The locking portion 144 is in contact with each other.

In the above state, when hydraulic pressure is supplied to the cylinder 111 of the cylinder body 110, the piston 130 rises by hydraulic pressure, and at this time, the first locking portion 134 constituting the piston 130 1 The horizontal locking protrusion (h1) tries to separate from the second horizontal locking protrusion (h2) of the second locking portion 144 constituting the operating piece 140.

That is, when the piston 130 tries to move upward, the first inclined surface v1 of the first engaging part 134 of the piston 130 and the second inclined surface of the second engaging part 144 of the operating piece 140 By (v2), a sliding movement is performed in which the operating piece 140 moves in the horizontal direction, specifically, in the outward direction, and thus the spring 150 is in a state in which a compressive force is applied.

In this way, while the piston 130 is moving upward, when the first horizontal locking step h1 at the next position reaches the position of the next second horizontal locking step h2, the piston 130 naturally moves to that position. remains supported.

Of course, if hydraulic pressure is continuously supplied to the cylinder body 110, the above process is repeated and movement and support are repeatedly performed.

Therefore, in the present invention, when hydraulic pressure is supplied to the cylinder body 110, movement and support force are repeatedly performed in the process of raising the piston 130.

Therefore, if a problem occurs in the hydraulic pressure supplied to the cylinder body 110, the vertical force of the bridge top plate 1b is caused by the first and second horizontal locking steps h1 and h2 of the first and second locking parts 134 and 144. It works to respond, thereby achieving the effect of preventing safety accidents.

Meanwhile, when attempting to return the piston 130 to its initial position after the piston 130 rises as described above, the present invention can lower the piston 130 with a simple operation.

That is, when the handle 162 of the operating pin 160 constituting the hydraulic jack 100 is pulled outward, it overcomes the elastic force of the spring 150 and moves into the operating portion coupling groove 121 of the safety nut portion 120. The operating piece 140 is subjected to a sliding movement in the outward direction.

Accordingly, the second engaging portion 144 of the operating piece 140 is spaced apart from the first engaging portion 134 of the piston 130, thereby allowing the piston 130 to be lowered.

Moreover, the above-described operating pin 160 is in a state in which the pin 161 fixedly coupled to the operating piece 140 is coupled to the handle 162 including the cam portion 162a by a hinge.

Therefore, after pulling the pin 161 using the handle 162 as described above, when the handle 162 is rotated around the hinge h, the cam portion 162a of the handle portion 162 is attached to the cylinder body 110. Even if the user does not continue to pull the operating pin 160 while in contact with the outside, the second engaging portion 144 of the operating piece 140 is maintained spaced apart from the first engaging portion 134 of the piston 130. This makes it possible to more comfortably lower the piston 130 and place it in its first position.

Although the above-described embodiment describes a preferred embodiment of the present invention, the present invention is not limited thereto and may be implemented in various forms without departing from the technical spirit of the present invention.

1: Bridge 1a: Pier or abutment 1b: Bridge deck
100: Hydraulic jack
110: cylinder body
111: cylinder
120: Safety nut part
121: Operating unit coupling groove 122: First spring coupling groove 123: First pin coupling hole
130: Piston
131: piston rod 132: contact part
134: first locking portion h1: first horizontal locking protrusion v1: first inclined plane
140: Operation
142: Second spring coupling groove 143: Second pin fixing hole
144: second locking portion h2: second horizontal locking protrusion v2: second inclined plane
150: spring
160: operating pin
161: Pin 162: Handle 162a: Cam part h: Hinge
200: Hydraulic supply unit
300: computer control unit
500: Computer-controlled lifting device using a fully automatic hydraulic jack

Claims (6)

A cylinder body installed on a pier or abutment constituting a bridge and formed with a cylinder through which hydraulic pressure enters the inside,
A safety nut portion coupled to the upper side of the cylinder body, forming an operating portion coupling groove on the inside, and including a first spring coupling groove and a first pin coupling hole on one side,
A piston rod that is coupled to the cylinder of the cylinder body and is raised and lowered by the incoming hydraulic pressure, a contact portion formed on the upper side of the piston rod, and a side of the piston rod, and the first horizontal locking protrusion and the first inclined surface are vertically aligned. A piston including a first engaging portion that is repeatedly extended and formed;
It is coupled to the operation part coupling groove of the safety nut part, and is formed smaller than the horizontal size of the operation part coupling groove so that a horizontal sliding movement can be performed in the operation part coupling groove, and the first horizontal locking protrusion of the piston is located inwardly. A second horizontal locking protrusion corresponding to the first inclined surface and a second inclined surface corresponding to the first inclined surface are formed by repeatedly extending in the vertical direction to form a second locking portion, and on the outside, a second locking portion corresponding to the first spring coupling groove of the safety nut portion is formed. 2 An operating piece in which a spring coupling groove and a second pin fixing hole corresponding to the first pin coupling hole are formed,
A spring coupled to the first and second spring coupling grooves to press the operating piece in the piston direction, and
In the first pin coupling hole constituting the safety nut part, horizontal sliding movement is possible, and in the second pin fixing hole of the operating piece, the fixed pin is rotatably coupled to the hinge formed at the end of the pin, and the cam A hydraulic jack consisting of an operating pin consisting of a handle containing a portion;
A hydraulic supply unit for supplying hydraulic pressure to the cylinder of the cylinder body;
A computer control unit for controlling the height of the lift by the bridge deck by raising and lowering the fully automatic hydraulic jack through the hydraulic quantity control and hydraulic quantity control of the hydraulic supply unit; a computer controlled lift including a hydraulic jack equipped with an automatic safety device, Device.
The computer-controlled lifting device according to claim 1, wherein the safety nut portion constituting the hydraulic jack is formed by being divided in a horizontal direction.
According to claim 1, the operating piece, spring, and operating pin constituting the hydraulic jack are arranged symmetrically in two places in a set, so that after the piston rises, the operating piece is slid outward through the handle of the operating pin to lower the piston. A computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device that allows
A cylinder body in which a cylinder through which hydraulic pressure is drawn inward is formed at the inner center of a pier or abutment constituting a bridge, is coupled to the upper side of the cylinder body and forms an operating unit coupling groove on the inside, and a first spring on one side. A safety nut portion including a coupling groove and a first pin coupling hole, a piston rod that is coupled to the cylinder of the cylinder body and is raised and lowered by incoming hydraulic pressure, and a contact portion formed in the upper direction of the piston rod and the piston rod. A piston is formed on the side and includes a first locking part formed by repeatedly extending a first horizontal locking protrusion and a first inclined surface in the vertical direction, and is coupled to the operating part coupling groove of the safety nut part, and is horizontal in the operating part coupling groove. It is formed to be smaller than the horizontal size of the actuating part coupling groove so that sliding movement can be achieved in the direction, and in the inner direction, there is a second horizontal locking protrusion corresponding to the first horizontal locking protrusion of the piston and a second inclined surface corresponding to the first inclined surface. A second locking portion is formed by repeatedly extending in the vertical direction, and on the outside, a second spring coupling groove corresponding to the first spring coupling groove of the safety nut part and a second pin fixing hole corresponding to the first pin coupling hole are formed. The formed operating piece and the spring coupled to the first and second spring coupling grooves so that the operating piece is pressed in the piston direction and the first pin coupling hole constituting the safety nut part are coupled to enable horizontal sliding movement, and the operating piece is In the second pin fixing hole, a hydraulic jack consisting of a fixed pin and an operating pin formed at the end of the pin and rotatably coupled by a hinge and consisting of a handle including a cam portion is installed,
It is equipped with an automatic safety device that installs a hydraulic supply unit for supplying hydraulic pressure to the hydraulic jack and a computer control unit to control the raising height by the bridge deck by raising and lowering the hydraulic jack through control and hydraulic quantity control of the hydraulic supply unit. Hydraulic jack installation step;
Using the computer control unit of the computer-controlled lifting device using a hydraulic jack installed in the installation step of the computer-controlled lifting device using a hydraulic jack, hydraulic pressure is supplied to the cylinder of the cylinder body constituting the hydraulic jack to raise the piston to raise the bridge top plate, and then the safety nut is lifted. A bridge deck lifting step of maintaining the raised state of the piston by operating the support portion of the safety nut to contact the contact portion of the piston; using a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device. Bridge raising method.
According to claim 4, wherein the safety nut part constituting the hydraulic jack in the installation step of the hydraulic jack equipped with the automatic safety device is formed by being divided in the horizontal direction. Bridge raising method using a device.
According to claim 4, in the step of installing the hydraulic jack equipped with the automatic safety device, the operating piece, spring, and operating pin constituting the hydraulic jack are formed as a set and are arranged symmetrically in two places, so that after the piston rises, the operating piece is operated through the handle of the operating pin. A bridge lifting method using a computer-controlled lifting device including a hydraulic jack equipped with an automatic safety device, which allows the piston to be lowered by sliding the operating piece outward.

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