KR100841640B1 - Cylinder type jack - Google Patents

Abstract

A cylinder-type jack is provided to allow compatible use of the jack irrespective of clearance of a wale and a strut since the entire length of the configuration can be extended. A cylinder-type jack(100) comprises a housing(110), a pair of joint members(120), a pair of length adjustable shafts(140), and a fixing member(145). The housing has an internal space(112), and an opening on its upper side communicated to the internal space. The joint members is joined by a connection member(130) at a front end of the housing to form a receiving part(122) communicated with the space. The length adjustable shafts are received in the receiving part of the joint member to reciprocate in and out of the receiving part, having a screw thread(142) on its periphery and a support plate(148) on its front end. The fixing member is combined to the screw thread of the length adjustable shaft, allowing its lower end to be caught by the front end of the joint member to fix the position of the length adjustable shaft.

Description

Cylindrical Load Jack {CYLINDER TYPE JACK}

The present invention relates to a cylindrical load jack, and more specifically, provided between the belt and the brace, can be used irrespective of the play between the belt and brace, and only replace parts damaged by the structure that can be separated by parts It is possible to reduce the cost, and it is related to the cylindrical load jack to prevent the occurrence of safety accidents when installing and dismantling the brace.

At present, the excavation method using a brace is used to prevent the collapse of the ground due to the excavation in the underground excavation work of construction and civil works, one example of which is illustrated by Figure 1, before the excavation of the ground wall first (1) is provided, and the ground is excavated, and then the band 2 and the braces 3a and 3b are provided on the inner surface of the retaining wall 1 to prevent the ground from collapsing. The axial force acts on the braces 3a and 3b by the earth pressure generated by the excavation, and the axial force 3 causes the compressive deformation of the braces 3a and 3b, and the soil wall 1 is excavated by this compressive deformation. It is bent in the negative direction, and the load jack 4 is connected to reduce this bending strain.

The load jack 4, the upper support plate 5 for connecting to the brace (3b) using a bolt, a screw shaft configured in parallel with the braces (3a, 3b), a compression nut screwed to the screw shaft, The screw shaft insertion hole is provided with a screw shaft insertion hole having a diameter smaller than the outer diameter of the compression nut, a support portion for supporting the screw shaft insertion hole, and a screw shaft inserted into the screw shaft insertion hole by a piston that protrudes from the cylinder by inserting the cylinder into the support portion. It is comprised so that it may be pushed out from.

When the usage of the load jack 4 is explained, a cylinder is inserted into the support portion of the load jack 4, a hydraulic pump is connected to the cylinder, and the hydraulic pump is operated to provide a screw shaft insertion hole by a piston projecting from the cylinder. The length of the load jack 4 is increased in such a manner that the inserted screw shaft is pushed out of the screw shaft insertion hole. In addition, even if the cylinder is removed by rotating the compression nut screwed to the screw shaft coupled to the upper support plate to the screw shaft insertion hole of the load jack, the length of the increased load jack is not reduced again.

In the conventional load jack, the length of the screw shaft is pushed by the cylinder in the support portion, but the length is variable. However, since the length of the screw shaft is variable only, it cannot be used when the clearance between the belt and the brace is large. There was a problem, and the unnecessary labor costs for the current production of the timber wasted.

Therefore, there is a need for improvement.

The present invention has been made to improve the above problems, an object of the present invention is to provide a cylindrical load jack that can replace only the parts damaged by the structure, the housing, the connecting member, the variable length axis, etc. can be separated for each part.

In addition, it can be used regardless of the gap between the belt and the support by the structure that can extend the overall length, thereby improving compatibility, thereby reducing the length of the support and eliminating unnecessary work for the current production of the support. It is an object to provide a cylindrical load jack which shortens the period and reduces the labor cost.

In order to achieve the above object, the cylindrical load jack according to the first embodiment of the present invention includes a housing having an opening at an upper portion to form a space therein and communicate with the space portion, and a coupling member at the front end of the housing. A connection member coupled by the coupling member and having a receiving portion communicating with the space part, the variable length shaft having a threaded portion formed at the periphery of the connecting member and received into and out of the receiving portion, and having a support plate at the front end thereof; The lower end portion is coupled to the thread of the variable length shaft and is fastened to the front end of the connecting member and comprises a fixing member for fixing the position of the variable length shaft.

On the other hand, the cylindrical load jack according to the second embodiment of the present invention, a housing having a space formed therein and an opening formed to be symmetrical to both sides, a partition plate formed in the center of the space portion of the housing and partitions the space portion; A pair of connecting members coupled to both sides of the housing by a coupling member and forming a receiving portion communicating with the space portion, and received and received in and out of the receiving portion of the connecting member, and a thread is formed at the periphery; It includes a pair of longitudinal variable shaft forming a support plate, and a fixing member coupled to the thread of the longitudinal variable shaft and the lower end is caught on the front end of the connecting member to fix the position of the variable length shaft.

Preferably, an inlet portion connected to the space portion is formed at a side of the housing, and a hydraulic cylinder is inserted into the space portion through the inlet portion.

The space part of the housing may have a height variable than that of the hydraulic cylinder to stack a variable length block on the lower end of the hydraulic cylinder.

In addition, the hydraulic cylinder is fixed by the position fixing member inside the space portion, the position fixing member is fixed groove portion formed in one side of the space portion and the fixing groove is inserted into the fixing groove to fix the position of the hydraulic cylinder It consists of fixing projections.

The guide piece which is in contact with the inner surface of the opening of the housing is formed on the surface in contact with the housing of the connection member.

In addition, the cross-sectional shape of the receiving portion of the connecting member and the end of the variable length axis is preferably a polygon.

The fixing member is coupled to a screw thread formed on the outer peripheral surface of the variable length shaft is movable around the length variable shaft by rotation, the lower end is a fastener for fixing the length of the variable length shaft by engaging the front end of the connecting member do.

The length-variable shaft is further provided with a departure preventing member so as not to be separated from the connection member to the outside.

The detachment preventing member includes a locking projection protruding from the inner surface of the connection member, and a stopper protruding outwardly of one end of the length-variable shaft so as to prevent the departure from the outside in correspondence with the locking projection.

The support plate is preferably further provided with an auxiliary length variable member is coupled to the thread of the variable length axis to move in the longitudinal direction of the variable length axis.

The auxiliary length variable member includes a coupling part protruding on one side of the support plate and accommodating the front end of the variable length shaft, and a female screw thread engaged with the screw thread on an inner surface of the coupling part.

On the other hand, the other housing is coupled to the other side of the housing of the first embodiment so as to be detachable by an extension member.

The extension member is formed on each surface facing each other of the housing and another housing, an extension piece having a fastening hole formed at an edge thereof, and a fastening member penetrating the fastening hole of the extension piece to couple the housing and the other housing to each other. Is done.

As described above, according to the cylindrical load jack according to the present invention, a housing, a connection member, a variable length shaft, and the like can be replaced only by a component that can be separated by a separate structure, thereby reducing the cost.

In addition, the structure that can be extended to the entire length by the auxiliary length variable member, the structure that can be used on both sides by symmetrically coupled the housing by the extension member, by the structure that can be used on both sides by forming a partition plate inside the housing It can be used regardless of the gap between the belt and the support, thereby improving the compatibility, thereby reducing the length of the support and eliminating unnecessary work for the current production, thereby reducing the construction period and reducing labor costs.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the cylindrical load jack according to the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

On the other hand, for convenience of description, the same parts or structures as the conventional invention and the same parts use the same reference numerals or names.

2 is an exploded perspective view of the cylindrical load jack according to the first embodiment of the present invention, Figure 3 is a combined perspective view of the cylindrical load jack according to the first embodiment of the present invention, Figure 4 is a cross-sectional view of AA 5 is a cross-sectional view taken along line BB of FIG. 4, and FIG. 6 is a state diagram of a cylindrical load jack according to the first embodiment of the present invention, and FIG. 7 is a view of the cylindrical load jack according to the first embodiment of the present invention. Another use state diagram.

As shown, the cylindrical load jack 100 according to the first embodiment of the present invention forms a space 112 therein and has a housing having an opening 114 at the top so as to communicate with the space 112. And a connecting member 120 having a receiving portion 122 coupled to the front end of the housing 110 by a coupling member 130 and communicating with the space 112, and the connecting member ( The length variable shaft 140 is accommodated in the receiving portion 122 of the 120 and the inside and the outside and the thread 142 is formed on the circumference, and the support plate 148 is formed at the front end of the length variable shaft 140. It is coupled to the screw thread 142, the lower end is made to include a fixing member 145 is fixed to the front end of the connecting member 120 to fix the position of the variable length shaft (140).

An inlet 116 is formed at a side surface of the housing 110 to be connected to the space 112, and the hydraulic cylinder 160 is inserted into the space 112 through the inlet 116. Used.

The outer surface of the inlet 116 is characterized in that the footrest 118 extending to the outside is formed.

One side surface of the hydraulic cylinder 160 is provided with a handle 162 protruding outwardly can freely mount and dismantle the hydraulic cylinder 160 in the space 112.

The space 112 of the housing 110 may be used by stacking a variable length block 165 at a lower end of the hydraulic cylinder 160 by raising the height higher than the hydraulic cylinder 160.

In addition, the hydraulic cylinder 160 is fixed by the position fixing member 170 inside the space 112.

The position fixing member 170 is a fixed groove portion 172 formed in one side of the space portion 112, and a fixed projection portion inserted into the fixing groove 172 to fix the position of the hydraulic cylinder 160 ( 174).

The fixing groove 172 is formed on one side of the interior of the space 112, it is preferable that the hydraulic cylinder 170 is a long groove in the longitudinal direction of the space 112 so that it can flow up and down, Therefore, when the length variable block 165 is stacked, the hydraulic cylinder 160 is movable only up and down, not flowing from side to side.

The guide piece 124 contacting the inner surface of the opening 114 of the housing 110 protrudes from a surface of the connection member 120 in contact with the housing 110.

In addition, the connection member 120 and the housing 110 are coupled by the coupling member 130, the coupling member 130 is formed on the surface facing the connection member 120 and the housing 110 It consists of a coupling member 134 through the coupling piece 132 and the coupling piece 132 to couple the connection member 120 and the housing 110.

In addition, the inner side of the receiving part 122 of the connecting member 120 is a polygonal hole, and the rear end of the variable length shaft 140 inserted into the receiving part 122 is formed in the same shape as the receiving part 122. To prevent the rotation of the variable length shaft 140 is characterized in that.

This is to prevent the length variable shaft 140 from being rotated in the receiving portion 122 of the connection member 120. As shown in FIG. 5, if the cross-sectional shape is a hexagonal structure as well as a polygonal structure to prevent rotation. It's okay.

In addition, the stopper 184 has a hexagonal cross-section as the stopper 184, which is a separation preventing member 180 to be described later, is formed at the end of the length variable shaft 140.

In addition, a plurality of ribs 126 are formed on the outer surface of the connection member 120 to reinforce the supporting rigidity, and the transfer ring 128 is preferably formed on one side of the connection member 120.

The fixing member 145 is coupled to the screw thread 142 formed on the outer circumferential surface of the variable length shaft 140 and is movable around the length variable shaft 140 by rotation, the lower end of the connecting member 120 It is characterized in that the fastener for fixing the length of the variable length shaft 140 by engaging the tip.

In addition, the length-variable shaft 140 is further provided with a departure preventing member 180 so as not to be separated from the connection member 120 to the outside.

The detachment preventing member 180 may include a locking jaw 182 protruding from the inner side of the upper end of the connection member 120, and the length-variable shaft 140 corresponding to the locking jaw 182 to prevent departure from the outside. It consists of a stopper 184 protruding to the outside of the lower end.

The support plate 148 is further provided with an auxiliary length variable member 150 coupled to the thread of the variable length shaft 140 to move in the longitudinal direction of the variable length shaft 140.

The auxiliary length variable member 150 is protruded to one side of the support plate 148 to receive the front end of the variable length shaft 140 and the screw thread on the inner surface of the coupling portion 152 And a female thread 154 engaged with the 142.

On the other hand, as shown in Figure 7 is characterized in that the other housing 110 'is coupled to the other side of the housing 110 to be detachable by the extension member 190 so as to be symmetrical.

The extension member 190 is formed on each surface facing each other of the housing 110 and another housing 110 ', an extension piece 192 having a fastening hole 193 formed at an edge thereof, and the extension piece. The fastening member 194 penetrates the fastening hole 193 of 192 to couple the housing 110 and another housing 110 ′.

The other housing 110 ′ has the same structure as the housing 110, and the connecting member 120, the length variable shaft 140, the support plate 148, and the like are connected in the same structure, and thus the length variable shaft 140 is formed in both directions. The variable can be applied according to the spacing between the strip 2 and the support (3).

The coupling relationship of each component to the another housing 110 'is the same as that of the housing side, and replaces the above.

On the other hand, Figure 8 is a perspective view of a cylindrical load jack according to a second embodiment of the present invention, Figure 9 is a C-C cross-sectional view of FIG.

As illustrated in FIG. 8 or 9, the cylindrical load jack 200 according to the second exemplary embodiment has a housing 110 in which a space 112 is formed therein and an opening 114 is formed to be symmetrical to both sides. And a partition plate 210 formed at the center of the space part of the housing 110 to partition the space part 112, and coupled to both sides of the housing 110 by a coupling member 130. A pair of connecting members 120 forming a receiving portion 122 in communication with the 112, and is accommodated in the receiving portion 122 of the connecting member 120 to enter and exit the inside and outside, the thread 142 around the It is formed, the front end is coupled to a pair of length-variable shaft 140 and the threaded portion 142 of the length-variable shaft 140, the lower end is caught on the front end of the connecting member 120 to form a support plate It comprises a fixing member 145 for fixing the position of the shaft 140.

A partition plate 210 is formed at the center of the housing 110 to be symmetrical with each other around the partition plate 210, and the hydraulic cylinders are divided into the space portions 112 partitioned by the partition plate 210, respectively. The length of the pair of variable-length axis 140 that is provided and symmetrical 160 is variable.

Sides of the housing 110 are formed with respective inlets 116 connected to the space 112 partitioned by the partition plate 210.

The other components except for the housing 110 of the second embodiment are the same as the first embodiment, and are replaced with those described above.

Hereinafter, the operation and effects of the cylindrical load jack according to the present invention.

First, in the first embodiment, before excavating the ground, first install the retaining wall (1), excavate the ground, and then install the strip (2) and braces (3) on the inner surface of the retaining wall (1) To prevent the collapse of the ground, at this time, the cylindrical load jack 100 is installed between the belt length (2) and the support beam (3).

First, look at the assembly of the cylindrical load jack 100, inserting the variable length shaft 140 through the opening 114 of the housing 110, and then connecting the connection member 120 on the upper portion of the housing 110. To combine.

In this case, a guide piece 124 protruding toward the housing 110 is formed at a lower portion of the connection member 120 so that the guide piece 124 contacts the inner surface of the opening 114 of the housing 110. Is easy to insert, is coupled by the coupling member 130 in the inserted state.

On the outer surface of the connection member 120, the support rigidity is improved by the rib 126 formed integrally with the coupling member 130.

Then, after the fastener 145 is screwed into the front end of the length-variable shaft 140 and coupled to the support plate 148 to the front end, the assembly of the cylindrical load jack 100 is completed.

A stopper 184 is formed at the lower end of the variable length shaft 140, and the stopper 184 is caught by the locking step 182 formed on the inner side of the front end of the connection member 120, so that the stopper 184 is not separated from the outside.

The lower end of the connecting member 120 and the length variable shaft 140, that is, the end surface of the stopper 184 is a hexagonal cross section, so it is not rotated and prevents safety accidents when workers step on the cylindrical load jack during construction. can do.

In addition, the housing 110, the inlet 116 is provided with a footrest 118 has the advantage that the operator can work by stepping on the footrest to improve the work efficiency.

As can be seen in the above-described assembly of the cylinder load jack 100, each component is separated, so that only the broken parts can be replaced when the cylinder load jack 100 is broken, thereby reducing the cost.

Thereafter, the lower surface of the housing 110 is bolted to the brace 3.

At this time, the variable length shaft 140 of the cylindrical load jack 100 is minimized so that the cylindrical load jack 100 does not interfere with the belt when the support 3 is installed.

Subsequently, the support plate 148 is fastened to the belt 2 in a state in which the brace 3 is transported by a crane or the like and inserted into the underground space.

One side of the connection member 120 has a transfer ring 128 is formed has the advantage of easy crane transport.

At this time, the support plate 148 by rotating the support plate 148 so as to be adjacent to the strip (2) to secure the length by the coupling portion 152 and the female thread 154, the auxiliary length variable member 150, When the hydraulic cylinder 160 is mounted on the space portion 112 of the housing 110, and the length variable shaft 140 is pressed toward the belt length 2 through the hydraulic cylinder 160, the belt length 2 is compressed by the pressure. do.

When the fixing member 145 is rotated in the above state and tightened to the thread 142 formed around the length variable shaft 140 to abut on the end of the connecting member 120, the length variable shaft 140 ) Does not move, so the brace 3 is maintained under pressure by the cylindrical load jack (100).

A fixing protrusion 174 is formed at one side of the hydraulic cylinder 170 and the fixing protrusion 174 is fixed without being flown by being inserted into the fixing groove 172 formed in the space 110.

The space 112 of the housing 110 may be formed higher than the hydraulic cylinder 160 so that the variable length block 165 may be stacked on the lower portion of the hydraulic cylinder 160 as needed.

In addition, since the handle 162 is formed to protrude outward from one side surface of the hydraulic cylinder 160, it is easy to insert or insert the variable block 165 into the space 112.

Subsequently, when the hydraulic pressure of the hydraulic cylinder 170 is removed, the length-variable shaft will be moved but cannot be moved by the fastener 145. Therefore, the gap between the belt length 2 and the brace 3 will not change. I support it.

The length is variable by the length variable shaft 140, the support plate 148 formed at the front end of the length variable shaft 140 is the total length of the cylindrical load jack 100 by the auxiliary length variable member 150 It can be used to adjust the length between the gimbal (2) and the brace (3) by the expandable structure, which can reduce the length of the brace (3), the length of the gimbal (2) and the brace (3) Intervals, there is an advantage that can solve the problem caused by the length limit of the brace (3).

On the other hand, as shown in Figure 7 as another state of use of the cylindrical load jack, a structure for detachably coupling another housing 110 'by the extension member 190 so as to be symmetrical to the other side of the housing 110. The other housing 110 ′ is also provided with components such as a connecting member 120, a variable shaft 140, a hydraulic cylinder 160, and a support plate 148 in the same manner as the housing 110. It has a structure that can extend the entire length of the load jack 100 and support in both directions.

Accordingly, by reducing the length of the brace 3, it is possible to reduce the cost and support both, has the advantage of improving the bearing capacity.

Installation is to mount the hydraulic cylinder 160 to the housing 112 of the one side of the one side (110) to extend the length of the variable shaft 140, and then fixed with a fixing member 145 as a fixing member, the other side The hydraulic cylinder 160 is mounted on the space part 112 of the housing 110 ′, and the variable length shaft 140 presses the belt, and then fixes the hydraulic cylinder 160 with the fixing member 145.

By extending the entire length of the cylindrical load jack 100 by the extension member 190, the length of the brace 3 is reduced to reduce the cost.

Hereinafter, looking at the dismantling of the cylindrical load jack 100 of the first embodiment, the hydraulic cylinder 160 is mounted on the space portion 112 of the housing 110 and the bottom of the length variable shaft 140 is pressed to the The fixing member 145 is spaced apart from the end of the connecting member 120.

This is to space the fixing member 145 from the front end of the connecting member 120 to be rotatable, and the moving distance of the variable length shaft 140 is such that the fixing member 145 is rotatable.

Subsequently, when the hydraulic pressure applied to the hydraulic cylinder 160 is gradually removed, since the load is pre-applied to the brace 3, the brace 3 is elongated, whereby the length-variable shaft 140 is connected to the connecting member 120. It is gradually inserted into the receiving portion 122 of the) is no load transferred to the brace 3.

As such, the cylindrical load jack 100 is dismantled by completely removing the load imparted to the brace 3. The variable length shaft 140 of the disassembled cylindrical load jack 100 is inserted into the receiving portion 122 of the connecting member 120 to minimize the length to facilitate transport and storage.

On the other hand, according to the cylindrical load jack according to the second embodiment as shown in Figure 8 or 9, the opening 114 is formed on both sides of the housing 110, the partition plate 210 is formed in the center It is made of the same structure so as to be symmetrical with respect to the partition plate 210.

First, the hydraulic cylinder 160 is mounted in one side space 112 around the partition plate 210 of the housing 110 to extend the length of the variable length shaft 140 and fix it with the fixing member 145. After extending the length by rotating the support plate 148 formed at the end of the variable-length shaft 140, it is fixed to the brace 3, the hydraulic cylinder 160 is mounted on the other space 112, and the other support plate ( 148 is coupled to the strip 2, and then the hydraulic cylinder 160 is supplied with hydraulic pressure to press the strip 2 to fix the length-variable shaft 140 with the fixing member 145.

Since the length variable shaft 140 can be used to adjust the length between the length of the belt (2) and the brace 3 by the variable structure of the length between the girdle (2) and the brace 3, the space between the brace 3 There is an advantage that can solve the problem of length limitation.

 Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a cross-sectional view showing a construction state of the excavation method using a conventional brace.

2 is an exploded perspective view of the cylindrical load jack according to the first embodiment of the present invention.

3 is a combined perspective view of the cylindrical load jack according to the first embodiment of the present invention.

4 is a cross-sectional view taken along line A-A of FIG.

5 is a cross-sectional view taken along line B-B in FIG.

6 is a state diagram used in the cylindrical load jack according to the first embodiment of the present invention.

7 is another use state of the cylindrical load jack according to the first embodiment of the present invention.

8 is a perspective view of a cylindrical load jack according to a second embodiment of the present invention.

9 is a cross-sectional view taken along line C-C in FIG.

* Description of the symbols for the main parts of the drawings *

100, 200: cylindrical load jack 110, 110 ': housing

112: space 114: opening

116: entrance 118: scaffold

120: connecting member 122: receiving portion

124: Guide 126: Rib

128: transfer ring 130: coupling member

132: coupling piece 140: length variable axis

142: thread 145: fixing member

148: support plate 150: auxiliary length variable member

152: coupling portion 154: female thread

160: hydraulic cylinder 162: handle

165: variable length block 170: position fixing member

172: fixing groove 174: fixing protrusion

180: release prevention member 182: locking jaw

184: stopper 190: extension member

192: extension 193: fastening hole

194: fastening member 210: partition wall

Claims (16)

A housing having a space therein and having an opening thereon to communicate with the space; A connecting member coupled to a distal end of the housing by a coupling member and having a receiving portion communicating with the space; A length-variable shaft accommodated in the receiving portion of the connection member, entering and exiting the inside and the outside, and having a screw thread formed at a circumference thereof, and forming a support plate at the front end thereof; And a fixed member coupled to the thread of the variable length shaft and having a lower end engaged with the front end of the connecting member to fix the position of the variable length shaft. A housing having a space formed therein and an opening formed to be symmetrical to both sides; A partition plate formed at the center of the space portion of the housing and partitioning the space portion; A pair of connecting members coupled to both sides of the housing by a coupling member and forming a receiving portion communicating with the space part; A pair of length-variable shafts which are accommodated in the accommodating portion of the connection member and are moved in and out and have a screw thread formed at a periphery thereof, and a support plate formed at the front end thereof; And a fixed member coupled to the thread of the variable length shaft and having a lower end engaged with the front end of the connecting member to fix the position of the variable length shaft. The method according to claim 1 or 2, An inlet portion connected to the space portion is formed on a side surface of the housing; A cylindrical load jack, characterized in that the hydraulic cylinder is inserted into the space portion through the inlet portion. The method of claim 3, wherein Cylindrical load jack, characterized in that the footrest extending outward is formed on the outer surface of the inlet. The method of claim 3, wherein The space portion of the housing cylindrical cylinder jack, characterized in that the height of the hydraulic cylinder can be laminated to a variable length block on the lower end of the hydraulic cylinder. The method of claim 3, wherein The hydraulic cylinder is a cylindrical load jack, characterized in that fixed by the position fixing member inside the space. The method of claim 6, The position fixing member has a fixed groove formed in one side of the space portion; The cylindrical load jack is inserted into the fixing groove portion, characterized in that consisting of a fixing projection for fixing the position of the hydraulic cylinder. The method according to claim 1 or 2, Cylindrical load jack, characterized in that the guide piece in contact with the inner surface of the opening of the housing is formed on the surface in contact with the housing of the connection member. The method according to claim 1 or 2, An inner side of the receiving portion of the connecting member is a polygonal hole; The rear end of the variable-length shaft inserted into the receiving portion is formed in the same shape as the receiving portion cylindrical load jack, characterized in that to prevent the rotation of the variable-length shaft. The method according to claim 1 or 2, The fixing member is coupled to the thread formed on the outer circumferential surface of the variable length shaft is movable around the length variable axis by rotation, the lower end is a fastener for fixing the length of the variable length shaft by being caught by the front end of the connecting member Cylindrical load jack. The method according to claim 1 or 2, The variable-length shaft is a cylindrical load jack, characterized in that further comprising a separation preventing member so as not to be separated from the connection member to the outside. The method of claim 11, The detachment preventing member includes a locking projection protruding from the inner surface of the connection member; The cylindrical load jack, characterized in that made of a stopper protruding outwardly of one end of the length-variable shaft corresponding to the locking step to prevent the departure to the outside. The method according to claim 1 or 2, The support plate is coupled to the thread of the longitudinal axis of the cylindrical load jack further comprises an auxiliary length variable member to move in the longitudinal direction of the longitudinal axis. The method of claim 13, The auxiliary length variable member is protruded to one side of the support plate and the coupling portion for receiving the front end of the variable length shaft; Cylindrical load jack, characterized in that consisting of a female thread that is engaged with the screw thread on the inner surface of the coupling portion. The method of claim 1, Another housing is detachably coupled to the other side of the housing by an extension member; The other housing is a cylindrical load jack, characterized in that the connecting member, the variable length axis is coupled in the same structure as the housing is variable in both sides. The method of claim 15, The extension member is formed on each surface facing the housing and the other housing, the extension piece forming a fastening hole on the edge; Cylindrical load jack, characterized in that consisting of a fastening member for penetrating the fastening hole of the extension piece for coupling the housing and another housing.

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