KR20210145969A - Pre-loading jack for retaining wall - Google Patents

Abstract

The present invention relates to a preload jack of a support means installed between a wale and a retaining wall so that a back earth pressure can be safely transmitted to a strut. The preload jack for supporting a retaining wall comprises: a cylindrical hydraulic body inside which a hydraulic chamber is provided and on the outer surface of which a male screw is formed; a pressure rod which is drawn out from a tip of the hydraulic body by hydraulic pressure acting on the hydraulic chamber to support the retaining wall; a support pipe body which is pulled out from the tip of the hydraulic body to support the retaining wall as a female screw formed on the inner surface thereof rotates while meshing with the male screw on the outer surface of the hydraulic body; and a pull-out stop means which limits a degree of how long the support pipe body is pulled out so that a minimum length of engagement between the male screw of the hydraulic body and the female screw of the support pipe body is maintained.

Description

Preload jack for retaining wall support {PRE-LOADING JACK FOR RETAINING WALL}

The present invention relates to a support means that is installed between the retaining wales on which the retaining wall is installed on the front side in order to evenly distribute the back earth pressure of the retaining wall to the bracing, so that the rear earth pressure can be safely transmitted to the bracing.

When excavating the ground to build an underground structure, a retaining wall is installed to support the back earth pressure so that safe work can be carried out inside the excavation.

These retaining walls are usually constructed by driving steel piles into the ground, or by using H-beams as thumb piles to drive them into the ground and stacking horizontal boards between thumb piles. In the case of construction, it is constructed by forming a continuous wall with CIP piles with H-beam thumb piles inserted at regular intervals. The back earth pressure of this retaining wall is supported by the holding member.

The retaining member is usually made of a wale installed in the horizontal direction from the front of the retaining wall, and a bracing that is continuously installed in the wale so as to be perpendicular to the retaining wall.

As such, the back earth pressure of the retaining wall is supported by the stress acting on the brace through the wale, and the stress transfer must be made clearly between the retaining wall and the retaining member.

On the other hand, it is not easy in reality to install the retaining wall in a straight line. For example, when an H-beam supporting load is driven into the ground or inserted into a drilling hole to form a thumb pile, the front surface of each thumb pile is generally not formed in a straight line. Therefore, there is a lot of room for a gap to occur between the band and the thumb stake.

In particular, in the reverse drilling method, if the formwork support frame has the function of a retaining member for supporting the retaining wall, when the slab construction of the corresponding layer is completed, the formwork support frame is lowered to construct the slab of the lower layer. At this time, the formwork support The bands constituting the outermost frame of the frame also descend together.

For the smooth descent of the form support frame, the distance between the thumb pile and the wale must be separated, and the distance between the band and the thumb pile makes the stress transfer between the retaining wall and the holding member unclear. Therefore, it is necessary to install a support means that can safely transmit the back earth pressure of the retaining wall to the retaining wall between the retaining wall or the thumb pile and the wale.

On the other hand, since only the front surface of the retaining wall or the thumb stakes embedded therein is exposed, it is not practically easy to fix the member for the installation of the support means between the wale and the wale. For example, even if the thumb pile is composed of H-shaped steel with a flange, in the case of the CIP pile structure, only the front side of the flange is exposed after being embedded in the concrete, and the part of the web remains embedded in the concrete. Even in the structure of stacking horizontal boards between thumb piles, it is impossible to fix the supporting member by means of assembly such as bolts, not welding means, because the horizontal boards are inserted into the web. In addition, welding means not only slows the work progress on the site, but also frequently causes safety accidents such as fire.

More specifically, as shown in FIG. 1, the jack device for support support of the utility model registration number 20-0344123 of the Registration Utility Model Publication No. 20-0344123 includes a plurality of spacing members 2 made of a bar-shaped member, and one side is a wale 20. It is coupled to the side of the wale 20 and at the same time supports the other side of the support connecting plate 3 to which one end of the gap maintaining member 2 is coupled, and installed at the other end of the gap maintaining member 2 A fixing member (4) for fixing the other end of the gap maintaining member (2) to the end plate (32) provided on the other side of the beotimbo (30) so as to maintain the gap between the band length (20) and the beotimbo (30); 4').

The jack device for supporting the beotimbo is inserted into the insertion hole formed in the end plate 32 of the beotimbo 30 at one end of the gap maintaining member 2 and fixed to the beotimbo 30, the gap maintaining member (2) In a state in which the support connecting plate 3 to which the other end of the is connected is fixed to the wale 20 by a fastening means 7 such as a bolt, the wale 20 and the brace 30 by the hydraulic body 9 When the gap is widened, the gap maintaining member 2 is integrated with the end plate 32 by the fastening of the fixing members 4 and 4' again so that the gap between the wale 20 and the brace 30 can be maintained. do.

However, since the above-mentioned jack device for supporting beams has to have a structure in which the gap maintaining member 2 is fastened to the end plate 32 of the braces 30 as described above, it is installed between the braces, such as the bandage and the braces. Although it can be, it cannot be used in places where only the front side is exposed, such as in retaining walls or thumb stakes, where there is no fastening structure.

In order to solve this problem, hydraulic jacks or screw jacks that do not require fixing work by fastening between the retaining wall and the wale are sometimes installed.

However, since the hydraulic jack capable of supporting earth pressure is usually large, it is not easy to use it in the narrow gap between the thumb pile and the wale. Loss of ability is common.

On the other hand, screw jacks can be used at narrow intervals compared to hydraulic jacks, but there is a lot of room for safety accidents due to the need to hit the handle with a hammer, etc. The installed screw jack is under great pressure from both sides of the retaining wall and the wale, so it is not easy to remove the screw jack to cancel the supporting state of the holding member.

KR 20-0344123 Y1

The present invention is intended to solve the above problems of the prior art, and is installed between a retaining wall or thumb pile and a wale, which cannot be assembled and fixed, to support the back earth pressure, and the branch and main support by pressurization at the same position By doing so, it is possible to achieve structural stability and shorten the construction period, and to maintain a high bearing capacity stably for a long time, as well as to facilitate the construction of a retaining wall support structure simply and easily by hand without a separate tool such as a hammer. It is an object of the present invention to provide a preload jack for retaining wall support that can improve workability while minimizing the occurrence of safety accidents through stable operation.

According to the most preferred embodiment of the present invention for solving the above problems, it is installed in the gap between the wale and the retaining wall to transmit and support the back earth pressure of the retaining wall to the wale, and a hydraulic chamber is provided inside and the outer circumferential surface A cylindrical hydraulic body with a male screw formed on the inside, a pressure rod drawn out from the tip of the hydraulic body by hydraulic pressure acting on the hydraulic chamber to support the retaining wall, and a female screw formed on the inner surface to engage and rotate with the male screw on the outer circumferential surface of the hydraulic body. It is characterized in that it consists of a support pipe that is drawn out from the front end of the body to support the retaining wall, and a pull-out stop means that limits the degree of withdrawal of the support pipe so that the minimum screw length is maintained between the male screw of the hydraulic body and the female screw of the support pipe body. A preceding load jack for supporting the retaining wall is provided.

With the withdrawal stopping means, the outer surface of the hydraulic body is composed of an external sliding part located at the front and an external fastening part located at the rear, and the external sliding part is made to protrude more than the external fastening part to form an upward stepped part between them, and the support pipe body The inner surface of the inner sliding part is located in the front and the inner fastening part located at the rear, the inner fastening part is made to protrude more than the inner sliding part, it is possible to form a downward step between them.

Also, as another embodiment of the withdrawal stopping means, a fixing piece is installed at the rear end of the hydraulic body, a locking fixing ring is formed to protrude at the rear end of the support pipe body, and the locking ring is hooked as being installed on the fixing piece Positioning means may be installed.

At this time, as the position adjusting means, a control rod having a male screw formed on the outer surface of the tip portion, a position fixing bracket having a fastening hole having a female screw formed on the inner surface, and a locking ring formed integrally with the position fixing bracket can be configured. .

According to another embodiment of the present invention, the hydraulic body has an inner tube in which the rear end is in contact with the wale, an outer tube into which the inner tube is inserted to form a sealed hydraulic chamber between the inner tube outer surface, and the inner side of the front end of the outer tube. There is provided a preload jack for retaining wall support, characterized in that the guide tube is provided at the rear while guiding the pressure rod while guiding the pressure rod to limit the withdrawal of the pressure rod.

The distal end of the support tube of the present invention may be integrally provided with an expanded surface portion having an increased cross-section, or an extended support having a cross-section larger than the cross-section of the front end of the support tube may be installed separately from the support tube.

In this case, the extended support may be composed of a pair of divided and extended pieces and an assembly rod connecting at least one side of these divided and extended pieces, and in this case, the divided and extended piece passes through one rod in a state coupled by the assembly rod. A semicircular groove should be formed in the center of one side of the divided and extended piece to form a hole.

The extended support may be configured in a horseshoe shape made of a single body while the lower portion of the rod through hole is opened.

The present invention does not require fastening or welding to the member to be pressed, and forms a support structure only by pressurizing the support pipe body. It can be used repeatedly and continuously, and the structure becomes simple and clear because the hydraulic body itself is used as a part of the support structure.

In addition, in the present invention, the construction work of the main support structure by the support tube body is made in the holding state by the pressure rod, and the support structure is completed only by rotating the support tube body by hand, so the operation is not complicated and proceeds quickly and efficiently In addition, it is possible to minimize the occurrence of safety accidents by not using tools such as hammers.

Also, in the present invention, since the branch support and main support are made by one hydraulic body, the branch support by the pressure rod and the main support by the support pipe body are made at the same point, the structure for the support structure between the wale and the retaining wall Since the design and calculations are made accurately, and the support pipe is mainly supported by the hydraulic body and the screw fastening structure, there is no risk of loss of support even if it is kept for a long time, and the fastening force between the hydraulic body and the support pipe is sufficiently guaranteed by the withdrawal stop means. and there is no risk of malfunction, so that it is possible to have high reliability of the support structure.

1 is a perspective view of a jack device for support support according to the prior art.
2 is a plan view and AA cross-sectional view in which the preceding load jack of the present invention is installed.
3 is a perspective view and a cross-sectional view of an embodiment of the preceding load jack.
4 is a cross-sectional view showing the construction process of the support structure by the preceding load jack at each stage.
5 is an explanatory view of the operation of the first embodiment of the withdrawal stop means provided in the preceding load jack.
6 is a perspective view and a cross-sectional view of the withdrawal stop means according to the second embodiment.
7 is an explanatory view of the operation of the withdrawal stop means according to the second embodiment.
8 is a cross-sectional view showing each embodiment of the extension support installed on the preceding load jack.
9 is a cross-sectional view showing the construction process of the support structure by the preceding load jack between the wale and the thumb pile through the extended support, at each stage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the description of the present invention, in the case of obscuring or obscuring the technical idea of the present invention due to the detailed description of the known configuration, the description of the known configuration will be omitted.

For reference, in this specification, terms meaning the front of the front, front, etc., refer to the direction from the wale 300 to the retaining wall 200, and the terms meaning the rear of the rear, rear, etc. are from the retaining wall 200 to the wale. It is defined as saying the direction toward (300).

2 is a plan view and AA cross-sectional view of a state in which the preceding load jack 100 of the present invention is installed in the gap (Δ) between the wale 300 and the retaining wall 200 to have the support structure of the retaining wall 200 , FIG. 3 shows an embodiment of the preceding load jack 100 .

As shown in FIG. 2, the preceding load jack 100 of the present invention is installed in the gap between the wale 300 and the retaining wall 200 to transmit the back earth pressure of the retaining wall 200 to the wale 300. while having the function to support it.

The position supported by the preceding load jack 100 of the present invention among the gaps (Δ) between the retaining wall 200 and the retaining wall 200 is the position between the main load acting point of the retaining wall 200 and the retaining wall 300. Preferably, when the retaining wall 200 is made of continuous steel sheet piles, the preceding load jack 100 is installed at regular intervals between the steel sheet pile and the front flange 310 of the wale 300, and the retaining wall is installed. When made by CIP piles, the preceding load jack 100 is installed between the H-shaped steel thumb pile 210 and the front flange 310 of the wale 300 in the CIP pillar. Here, the preceding load jack 100 will be described as an example to be installed between the band 300 and the thumb stake 210 .

As shown in Fig. 3, the preceding load jack 100 of the present invention is drawn out from the front end of the hydraulic body 110 and the hydraulic body 110 and presses the front surface of the thumb pile 210 to apply a preceding load, and , the pressure rod 120 having the retaining wall 200 until the main support by the support pipe body 130 to be described later is made, and the thumb stake 210 is finally pulled out from the tip of the hydraulic body 110 . It consists of a support pipe body 130 for main support of the wall 200 .

The hydraulic body 110 is made of a cylindrical shape and while drawing out the pressure rod 120 , on the other hand, it is fixed to the front flange 310 of the wale 300 , and is coupled to the support pipe body 130 with the thumb stake 210 and the wale It is installed in the gap (Δ) between the 300 and functions to support the retaining wall 200 .

That is, the pressure rod 120 primarily forms a support structure of the retaining wall 200 in the gap (Δ) together with the hydraulic body 110, and the support pipe 130 is the hydraulic body 110 in the gap ( In △), the final main support structure for the retaining wall 200 is formed.

The hydraulic body 110 draws the pressure rod 120 forward in a state in which the rear end is fixed to the front flange 310 of the wale 300, and can hold it while pressing the thumb stake 210, especially its structure There is no need to limit

For example, a hydraulic pressure chamber 114 is provided inside the hydraulic body 110 so that the pressure rod 120 can be drawn out by hydraulic pressure, and the hydraulic chamber 114 can be located at the rear of the hydraulic body 110 . . However, in consideration of the fact that it is installed and fixed in the air for efficiency of work, as shown in FIG. 3 , the configuration of the pressure rod 120 while making the hydraulic chamber 114 in a ring-shaped structure is a tubular body with an empty inside. It is desirable to reduce the self-weight of the preceding load jack 100 by having a cross-section of the shape and to minimize the overall length so that it can be easily applied to a very narrow gap (Δ).

The hydraulic body 110 of the preceding load jack 100 according to the embodiment of FIG. 3 has an inner tube 111 whose rear end is in contact with the front flange 310 of the wale 300, and the inner tube 111 is inserted It consists of an exterior 112 and a guide tube 113 that limits its withdrawal while guiding the pressure rod 120 .

A sealed hydraulic chamber 114 is formed between the outer surface of the inner tube 111 and the inner surface of the outer tube 112 to be filled with a fluid for operation of the pressure rod 120 . The pressure rod 120 is positioned in front of the hydraulic chamber 114 and moves forward and backward by the hydraulic pressure generated in the hydraulic chamber 114 .

The guide tube 113 forms an opening together with the outer surface of the front end of the inner tube 111 and is located inside the front end of the outer tube 112 so that the pressing rod 120 can stably protrude and descend.

In addition, a stopping jaw 113a is formed at the rear of the guide tube 113 , and a stopping jaw 121 is formed at the rear end of the pressing rod 120 in response thereto. Accordingly, the pressing rod 120 is capable of moving forward only to the point at which the stopping jaw 121 is caught by the stopping jaw 113a.

The support pipe body 130 rides on the outer surface of the hydraulic body 110 and moves forward and backward to replace the pressure rod 120 in the held state, and finally, as described above, the gap between the wale 300 and the thumb stake 210 . It functions as a main support for the retaining wall 200 while being installed in (Δ).

The front and rear movement of the support pipe body 130 with respect to the outer surface of the hydraulic body 110 is made in a screw fastening method.

To this end, a male screw 117 is formed on the outer surface of the hydraulic body 110 , and a female screw 137 engaged with the male screw 117 is formed on the inner surface of the support pipe body 130 . Therefore, the support pipe body 130 can be moved forward while being drawn out from the tip of the hydraulic body 110 while rotating in a screw fastening method to support the retaining wall 200 .

4 is a step-by-step view of a work process for forming a support structure between the band length 300 and the thumb stake 210 using the preceding load jack 100 of the present invention. This will be described in detail as follows.

First, in a state in which the rear end of the hydraulic body 110 is in close contact with the front flange 310 of the wale 300 as shown in FIG. While applying a preceding load to the retaining wall 200 is supported. As a result, as shown in (b) of FIG. 4 , a temporary support structure is formed between the wale 300 and the retaining wall 200 .

When the support structure by the pressure rod 120 is made, in that state, the support tube body 130 located on the outer surface of the hydraulic body 110 is drawn out and moved forward, and the tip of the thumb is pressed as shown in FIG. 4(c). It adheres to the front of the pile 210 . Since the forward movement of the support pipe body 130 is made in a state in which the back earth pressure of the retaining wall 200 is supported by the pressure rod 120, it can be easily performed without applying any special force.

For example, the operator can easily attach the tip of the support tube body 130 to the front surface of the thumb stake 210 by simply rotating the support tube body 130 by hand in a screw fastening method.

When the front end of the support pipe body 130 is in close contact with the front surface of the thumb pile 210, by removing the hydraulic pressure of the hydraulic body 110 to retreat the pressure rod 120 to the rear, the pressure rod 120 in FIG. The branch support structure of (b) is replaced with the main support structure of FIG. 4 (d) by the support tube body 130 .

In this case, the front end of the support tube body 130 may further include an expanded surface portion 131 having an increased cross-section. The expanded surface portion 131 widely distributes the load acting between the support pipe body 130 and the thumb pile 210 to form a stable support structure.

On the other hand, the main support for the retaining wall 200 is made by having the hydraulic body 110 and the support pipe body 130 have an integral configuration, and the degree of their integral configuration is determined by the male screw 117 and the female screw 137. ) depends on the clamping force of Therefore, the withdrawal of the support pipe body 130 with respect to the hydraulic body 110 is the minimum that can safely transfer the load between the male screw 117 of the hydraulic body 110 and the female screw 137 of the support pipe body 130 . It should be done within the range that maintains the screwing length.

The preload jack 100 of the present invention is provided with a withdrawal stop means for limiting the extent to which the support pipe body 130 can be withdrawn from the front end of the hydraulic body 110 .

As shown in (b) of FIG. 2 , the first embodiment of the withdrawal stopping means includes an upward stepped portion 118 on the outer surface of the hydraulic body 110 and a downward stepped portion on the inner surface of the support tube body 130 . (138).

More specifically, the outer surface of the hydraulic body 110 is composed of an external sliding part 115 located in the front and an external fastening part 116 located in the rear, and a male screw 117 formed on the outer surface of the hydraulic body 110 is It is located only in the external fastening part 116 . At this time, the outer sliding portion 115 protrudes more than the screw thread of the outer fastening portion 116, whereby the upward stepped portion 118 is formed.

Correspondingly, the inner surface of the support tube body 130 is also composed of an inner sliding portion 135 located at the front and an inner fastening portion 136 located at the rear, and the female screw 137 formed on the inner surface of the support tube body 130 is described above. It is located only in the inner fastening portion 136, and at this time, the inner fastening portion 136 protrudes more than the sliding portion, thereby forming the downward stepped portion 138.

The withdrawal restriction of the support tube body 130 by the withdrawal stop means of the first embodiment is made by bringing the downward stepped portion 138 of the support tube body 130 and the upward stepped portion 118 of the hydraulic body 110 into contact with each other. That is, as shown in Fig. 5 (a), when the support tube body 130 is rotated in a screw fastening method and moved forward, the downward stepped portion 138 together with the inner fastening portion 136 is also moved forward, When the downward stepped portion 138 comes into contact with the upward stepped portion 118 of the hydraulic body 110 as shown in (b) of FIG. 5 , the support pipe body 130 cannot move forward any longer.

Therefore, between the support pipe body 130 and the hydraulic body 110, since at least the length of the internal fastening part 136 of the support pipe body 130 is screwed, the internal fastening part ( 136), it is possible to set the minimum screwing length.

6 and 7 relate to a second embodiment of the withdrawal stopping means, and FIG. 6 is a perspective view and a cross-sectional view thereof, and FIG. 7 is an explanatory view of its operation.

The withdrawal stop means according to the second embodiment includes a fixing piece 176 installed at the rear end of the hydraulic body 110 , a locking fixing ring 132 protruding from the rear end of the support pipe body 130 , and the fixing piece It is installed on the 176 and consists of a position adjusting means 171 for limiting the movement of the support tube body 130 by making the locking fixing ring 132 to be caught.

The position adjusting means 171 is provided with a control rod 172 having a male screw 172a at its tip, and a female screw 174a on the inner surface of a fastening hole 174 that is screwed to the male screw 172a. The position fixing bracket 173 and the engaging moving ring 175 integrally formed with the position fixing bracket 173 are included and configured.

The engaging ring 175 has a ring shape surrounding the support tube body 130 and is configured to be slidably movable along the outer surface of the support tube body 130, as shown in FIG. 7, the support tube body 130. When is moved forward by the set amount, the locking ring 132 is caught so that the support tube body 130 cannot move forward any longer.

Therefore, the maximum moving distance in the front of the support tube body 130 is determined according to the position of the engaging ring 175, the positioning of this engaging moving ring 175 is the adjustment rod 172 and the position fixing bracket (173) made by That is, the operator moves the position fixing bracket 173 forward or backward in a screw fastening method by rotating the control rod 172 in a clockwise or counterclockwise direction, and thus the position fixing bracket 173 and the integral locking movement By allowing the ring 175 to move forward or backward, the forward movement range of the support tube body 130 can be set.

The withdrawal stop means of the second embodiment capable of adjusting the position of the locking ring 175 in this way varies the minimum screw fastening length according to the size of the back earth pressure, and the size of the gap between the wale 300 and the thumb stake 210 It has wider versatility than that of the first embodiment in that it can properly respond to

The rear end of the control rod 172 is installed in a structure that can rotate while its position is fixed in the through hole 176a provided in the fixing piece 176 . At this time, in order to easily rotate the control rod 172, a separate rotation table (not shown) extending from the rear end of the control rod 172 may be provided, and a tool insertion slit 172b is formed on the rear end surface of the control rod 172. It can also be provided.

A plurality of positioning means 171 may be installed at equal intervals, such as being installed at positions symmetrical to each other based on the locking ring 175, but as shown in FIG. 6, only one positioning means 171 is installed And the rest, by installing the positioning means 180 to prevent shaking while guiding the movement of the locking ring 175, it is possible to promote the speed of the positioning operation of the locking ring 175.

The position guide means 180 is also inserted into the guide bracket 181 integrally formed with the engaging ring 175 to correspond to the location adjustment means 171 and the through hole 181a of the guide bracket 181 . It consists of a guide rod 182 that slides and an installation piece 183 installed at the rear end of the hydraulic body 110 . However, there is no need to form a thread at the tip of the through hole 181a of the guide bracket 181 and the guide rod 182 , and the guide rod 182 does not need to be rotatably installed on the installation piece 183 . There is a difference from the position adjustment means 171 in.

The withdrawal stop means of this second embodiment allows the forward movement of the support tube body 130 only until the locking ring 132 provided at the rear end of the support tube body 130 is caught by the locking ring 175, so support The pipe body 130 is moved too forward to prevent the operation of the preceding load jack 100 from becoming unstable.

As described above, the front end of the support tube body 130 may be provided with an extended surface portion 131 for distributing the load. A separate extension separated from the support tube body 130 instead of the expanded surface portion 131 may be provided. The support 140 may be installed.

The extended support body 140 is installed in front of the support pipe body 130 and is configured to have a cross section larger than the cross section of the front end of the support pipe body 130 like the expanded surface part 131 . 8 shows each embodiment of such an extended support 140 .

The extended support 140 of the embodiment shown in (a) of FIG. 8 is composed of a pair of divided and extended pieces 141 and an assembly rod 142 connecting these divided and extended pieces 141 .

A pair of divided and extended pieces 141 is formed with a semi-circular groove portion 143a in the center of one side of each divided and extended piece 141 so that one rod through hole 143 is formed in the coupled state, and both sides are formed at the top and bottom. It has a structure provided with a fastening hole 144 that passes through it.

The assembly rod 142 penetrates through each fastening hole 144 provided in the pair of divided and extended pieces 141 and is fastened by the nut 145, whereby the pair of divided and extended pieces 141 are integrated into one single unit. The extended support 140 is configured. Therefore, it is possible to assemble these divided and extended pieces 141 in a state in which the pressing rod 120 holds the thumb pile 210, and by adjusting the fastening position of the nut 145, the rod through hole 143 is formed. can be resized. Thereby, it is possible to apply universally to the pressure rod 120 of various standards.

Although not shown, when it is not necessary to adjust the scale of the rod through hole 143, assembly by the fastening hole 144 and the assembly rod 142 on only one side is possible, and the other side of the other side is a pair of divisional expansion By having the piece 141 hinged so as to be rotatable with each other, the assembly of the divided extension piece 141 may be facilitated, thereby improving workability.

The extended support 140 of the embodiment shown in (b) of FIG. 8 is made of a single body while opening the lower portion of the rod through hole 143 and has the shape of a horseshoe. This horseshoe-shaped extended support 140 allows the pressure rod 120 holding the thumb stake 210 to be easily inserted into the rod through hole 143 through the lower open portion.

However, the horseshoe-shaped extended support 140 with an open lower part has room to depart while rotating while spanning the pressing rod 120 . Therefore, the extension support 140 is attached to the pressure rod 120 by providing the anti-rotation magnet 146 on the upper surface of the rod through hole 143, or the extension support 140 as shown in (b) of FIG. ) by providing a rotation preventing magnet 146 at the upper end of the extended support 140 to be attached to the thumb pile 210, it is possible to prevent rotation and separation of the extended support 140.

In addition to the above-described load distribution function, the extended support 140 of the separated structure has an excessively large gap (Δ) between the front flange 310 of the wale 300 and the front surface of the thumb stake 210, so that the support tube body If it is not appropriate to support only 130, in order to more specifically attach the tip of the support tube body 130 to the thumb stake 210, the forward movement must be large, and for this reason, the screw with the hydraulic body 110 When the fastening length is not sufficient as necessary, a portion of the gap is filled to reduce the degree of forward movement of the support tube body 130 to sufficiently lengthen the screw fastening length to have structural stability.

9 is a view showing the work process for structurally connecting between the band 300 and the thumb stake 210 through the above-described extended support 140, step by step. This will be described in detail as follows.

First, in a state in which the pressure rod 120 holds the thumb stake 210 (FIG. 9 (a)}, the expansion support 140 is installed on the pressure rod 120 (FIG. 9 (b)) , After moving the support tube body 130 forward so that its tip is in close contact with the rear surface of the extended support body 140 (FIG. While supporting the retaining wall 200 through the medium (140), the wale 300 and the thumb stake 210 can be structurally connected (Fig. 9 (d)).

In the above, the present invention has been described in detail with reference to specific embodiments, but since the embodiments are merely examples for easy understanding of the present invention, those of ordinary skill in the art will appreciate the scope of the technical spirit of the present invention. It is self-evident that it can be implemented with various modifications within. Accordingly, such modifications will be said to be within the scope of the present invention as described in the claims.

100; preload jack 110; hydraulic body
111; interior 112; Exterior
113; guide 113a; detent
114; hydraulic chamber 115; outside sliding part
116; external fastening part 117; (of hydraulic body) male thread
118; upward step 120; pressure rod
121; jamming jaw 130; support body
131; extended surface portion 132; jam fixing ring
135; anti-sliding part 136; inner fastening part
137; (of the support body) female thread 138; downward step
140; extended support 141; split extension
142; assembly rod 143; rod through hole
143a; semicircle groove 144; fastener
145; nut 146; anti-rotation magnet
171; positioning means 172; control rod
172a; (of control rod) male thread 172b; tool insert slit
173; Position Fixing Bracket 174; fastening hole
174a; (of the fastening hole) female thread 175; jam moving ring
176; batten 176a; (Fixed Convenience) Through Hole
180; location guide means 181; guide bracket
181a; (of guide bracket) through hole 182; guide rod
183; installation 200; mud wall
210; thumb 300; braid
310; front flange

Claims (11)

It is installed in the gap between the wale 300 and the retaining wall 200 to transmit and support the back earth pressure of the retaining wall 200 to the wale 300,
A cylindrical hydraulic body 110 having a hydraulic chamber 114 therein and having an external screw 117 formed therein;
The pressure rod 120 which is drawn out from the tip of the hydraulic body 110 by the hydraulic pressure acting on the hydraulic chamber 114 and has the retaining wall 200, and;
A female screw 137 is formed on the inner surface and is drawn out from the tip of the hydraulic body 110 while rotating in engagement with the male screw 117 of the outer surface of the hydraulic body 110 to support the retaining wall 200. The support pipe body 130 and,
It is characterized in that it consists of a withdrawal stop means for limiting the degree of withdrawal of the support tube body 130 so that the minimum screw length is maintained between the male screw 117 of the hydraulic body 110 and the female screw 137 of the support tube body 130. Preload jack for supporting retaining wall. According to claim 1,
The outer surface of the hydraulic body 110 is composed of an external sliding part 115 located in the front and an external fastening part 116 located in the rear, and between the external sliding part 115 and the external fastening part 116 is an external sliding part. An upward stepped portion 118 is formed so that (115) protrudes,
The inner surface of the support tube body 130 is composed of an inner sliding portion 135 located at the front and an inner fastening portion 136 located at the rear, and an inner fastening portion between the sliding inner portion 135 and the inner fastening portion 136 . A downward stepped portion 138 is formed so that (136) protrudes,
The male screw 117 of the hydraulic body 110 is formed only in the outer fastening portion 116, and the female screw 137 of the support pipe body 130 is formed only in the inner fastening portion 136,
The withdrawal stopping means consists of an upward stepped portion 118 and a downward stepped portion 138, and when the downward stepped portion 138 is caught in the upward stepped portion 118, the support tube body 130 is no longer drawn out. Preload jack for supporting retaining wall with The method of claim 1,
The withdrawal stopping means includes a fixing piece 176 installed at the rear end of the hydraulic body 110 , a locking fixing ring 132 protruding from the rear end of the support pipe body 130 , and the fixing piece 176 installed on the fixed piece 176 . Preload jack for retaining wall support, characterized in that it comprises a position adjusting means 171 that restricts the movement of the support pipe body 130 by making the locking ring 132 to be caught as one. 4. The method of claim 3,
The position adjusting means 171 is a position fixing bracket 173 provided with an adjusting rod 172 having a male screw 172a formed on the outer surface of the tip portion and a fastening hole 174 having a female screw 174a formed on the inner surface thereof; Preload jack for retaining wall support, characterized in that it includes a locking moving ring (175) formed integrally with the position fixing bracket (173). According to claim 1,
The hydraulic body 110, the rear end of the inner tube 111 in contact with the wale 300, and the inner tube 111 is inserted to form a sealed hydraulic chamber 114 between the outer surface of the inner tube (111) The exterior 112 and the guide tube 113 positioned inside the front end of the exterior 112 to guide the pressing rod 120 while having a stopper 113a at the rear limiting the extraction of the pressing rod 120. Preload jack for retaining wall support, characterized in that consisting of. According to claim 1,
Preload jack for retaining wall support, characterized in that the front end of the support tube body (130) is provided with an expanded surface portion (131) with an increased cross section integrally. According to claim 1,
In front of the support pipe body 130, an extension support 140 having a cross section larger than the cross section of the front end of the support pipe body 130 is separately installed. 8. The method of claim 7,
The extended support 140 is composed of a pair of divided and extended pieces 141 and an assembly rod 142 connecting at least one side of these divided and extended pieces 141, and the divided and extended pieces 141 are Preload jack for retaining wall support, characterized in that the semi-circular groove portion (143a) is formed in the center of one side so that one rod through hole (143) is formed in the state coupled by the assembly rod (142). 9. The method of claim 8,
Preload jack for retaining wall support, characterized in that either side of the pair of divided extension pieces 141 is hinged to be rotatable with each other. 8. The method of claim 7,
The extension support 140, the load jack for retaining wall support, characterized in that made of a single piece of horseshoe shape with the lower portion of the rod through hole 143 open. 11. The method of claim 10,
Preload jack for retaining wall support, characterized in that the anti-rotation magnet (146) is provided at the upper end of the extended support (140).

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