JP2022032630A - Pulling-out device and pulling-out method for casing - Google Patents

Abstract

To provide a pulling-out device for a casing allowing a casing buried in a horizontal direction or in an oblique direction to be pulled out.SOLUTION: A pulling-out device for a casing is provided with: a fixing frame unit provided with a base plate for attaching the device on an object to be pulled; a pulling unit provided with clamping means clamping a part of the casing inserted in the ground and pressure type telescopic means moving the clamping means, which is held with the fixing frame; and a coming-out preventative unit provided with pressing means inserted in an entrance opening of the casing and pressing filling in the casing, which is held by the fixing frame unit, wherein an end part of the pulling unit is rotatably connected to the base plate through a hinge structure, and the pressing means is provided with a pressing rod held with the fixing frame unit and a pressing member arranged at a tip of the pressing rod and fittable in the entrance opening of the casing, the pressing rod being placed so as to penetrate into the clamping means of the pulling unit.SELECTED DRAWING: Figure 2

Description

The present invention relates to a casing pulling device and a pulling method suitable for pulling out a casing buried horizontally or diagonally, and is effective for pulling out a casing buried in the platform, for example, during reinforcement work of an embankment type platform. Technology.

One of the structures of the station platform is the embankment-type station platform, which supports the embankment with a masonry-type masonry wall in which masonry blocks are stacked. Some of the existing embankment-type station platforms have passed many years since their construction and no longer meet the recent earthquake resistance standards. There is a concern that such an embankment-type station platform may collapse due to the collapse of stones or the slip collapse of the embankment due to external force during a large-scale earthquake.
Therefore, the applicant has developed a technique for burying and reinforcing a columnar reinforcing body made of mortar or the like in the embankment of the embankment type station platform. Specifically, a steel pipe is inserted into the embankment diagonally from the masonry wall to form a casing, mortar and grout are injected, and then solidified to construct a columnar reinforcement in the embankment. It is to do.

By the way, since the surface of the steel pipe serving as the casing of the reinforcing body as described above is smooth, it is stronger to pull it out and bring the reinforcing body of the mortar or grout into contact with the embankment rather than leaving the steel pipe. Can be enhanced. However, since a large force is required to pull out the casing, a casing pulling device is required.
Conventionally, as a device for pulling out a casing buried in the ground, those described in Patent Documents 1 and 2 are known.

Jitsukaisho 61-125548 Japanese Unexamined Patent Publication No. 9-111763 Jitsukaisho 61-155496

However, all of the casing pulling devices described in Patent Documents 1 and 2 are provided with a means for gripping or locking the end of a steel pipe serving as a casing and a hydraulic cylinder, and the device is installed on the ground surface and pulled out in the vertical direction. Therefore, there is a problem that the casing buried in the horizontal direction or the diagonal direction cannot be pulled out.
Further, Patent Document 3 describes an invention relating to a device for press-fitting and pulling out a casing tube in an oblique direction with respect to the ground. However, since the device described in Patent Document 3 needs to use a large heavy machine, it is difficult to secure a sufficient work space because rails are laid on the sides like an embankment of a station platform. There is a problem that it is difficult to apply when working in a place.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide a casing pulling device and a pulling method capable of pulling out a casing embedded in a horizontal direction or an oblique direction. There is something in it.
Another object of the present invention is to provide a casing extraction device and a extraction method capable of performing work in a place where it is difficult to secure a work space.

In order to achieve the above object, the invention according to this application is
The fixed frame unit provided with a base plate for attaching a device to a work object, a gripping means for gripping a part of a casing inserted in the ground, and a pressure type telescopic means for moving the gripping means. In a casing extraction device including a extraction unit held by the unit and a retaining unit inserted into the inlet portion of the casing and provided with a holding means for pressing the filling in the casing and held by the fixed frame unit.
The end of the extraction unit is rotatably coupled to the base plate by a hinge structure.
The pressing means includes a pressing rod held by the fixed frame unit, and a pressing member provided at the tip of the pressing rod and capable of being fitted to the entrance portion of the casing.
The presser bar is configured to be arranged so as to penetrate the gripping means of the pull-out unit.

According to the casing extraction device having the above configuration, the end portion of the extraction unit is rotatably connected to the base plate to be joined to the work object by the hinge structure, so that the extraction unit can be arbitrarily connected to the base plate. It can be tilted at an angle, and the casing embedded in the horizontal or diagonal direction can be pulled out. Further, since the pressing rod having a presser member that can be fitted to the inlet portion of the casing is provided at the tip portion, the casing can be pulled out by the pulling unit while pressing the filling material inside the casing by the holding rod. Furthermore, since the device is compact and can be assembled and disassembled, it is possible to work in places where it is difficult to secure a work space such as the embankment of a station platform.

Here, preferably, the pressure type telescopic means is a hydraulic jack.
The base plate is provided with at least a pair of support pieces having shaft holes so as to project substantially parallel to the surface of the base plate opposite to the surface to be joined to the object.
A connecting member having a shaft hole is provided at the end of the hydraulic jack.
The hinge structure is formed by the shaft hole provided in the pair of support pieces and the pin shaft inserted into the shaft hole provided in the connecting member.

According to the above configuration, the hydraulic jack is inserted into the base plate by aligning the shaft hole of the connecting member at the end of the hydraulic jack with the shaft hole of the support piece provided on the base plate and inserting the pin shaft. It can be easily connected and tilted at any angle. In addition, in this specification, "substantially parallel" includes a state close to parallel.

Further, preferably, the extraction unit includes two hydraulic jacks arranged substantially in parallel, and the gripping means is provided on a support plate laid horizontally between the cylinders of the two hydraulic jacks. To.
According to this configuration, the extraction unit is provided with two hydraulic jacks that are substantially parallel to each other, and a gripping means for gripping and gripping the end portion of the casing is provided between the two hydraulic jacks, so that the casing is evenly provided with hydraulic jacks. A force can be applied, which allows the casing to be pulled out smoothly.

Further, preferably, the fixed frame unit comprises a pair of connecting bars coupled to the base plate and a reaction force plate laid across between the other ends of the connecting bars.
The retaining unit comprises a connecting ring coupled to the end of the casing to be pulled out.
A square screw is formed on the outer circumference of the presser bar.
A nut to which the square screw of the presser bar can be screwed is fixed to the reaction force plate.
The connecting ring is provided with a cylindrical guide member through which the holding rod is inserted so as to be movable in the axial direction.
The gripping means is configured to include a chuck that grips and grips the outer periphery of the casing.

According to the above configuration, when the casing is pulled out, the reaction force plate prevents the presser bar from moving in the axial direction, prevents the presser member at the tip of the presser bar from coming off the casing, and secures the filling. Can be pressed into. Further, since the connecting ring is provided with a cylindrical guide member through which the pressing rod is inserted, the connecting ring can be guided along the pressing rod by the guide member, and the movement of the movable part of the extraction unit is stabilized. Can be made to.

Other inventions according to this application
In a casing pulling method using a pulling device provided with a gripping means for gripping a part of a casing inserted in the ground and a pressure type telescopic means for moving the gripping means.
While pressing the filler in the casing by the pressing member that can be inserted into the inlet portion of the casing, the pressure type expansion / contraction means is operated to move the casing gripped by the gripping means and pull it out from the ground. It was done.
According to such a method, it is possible to prevent the wall of the drilled hole from collapsing and collapsing when the casing is pulled out, whereby the shape of the reinforcing body buried in the ground can be accurately maintained and reinforced. The strength of the body can be guaranteed.

According to the casing pulling device and the pulling method of the present invention, the casing embedded in the horizontal direction or the diagonal direction can be pulled out. It also has the effect of being able to work in places where it is difficult to secure a work space, such as the embankment of a station platform.

(A) is a cross-sectional view showing a cross-sectional structure of a station platform embankment as an example of a structure provided with a reinforcing body that requires casing pulling work, and (B) is a cross-sectional view of the reinforcing body constructed in the embankment before pulling out the casing. It is sectional drawing which shows the structure. It is a top view which shows one Embodiment of the casing pulling-out device which constitutes the casing pulling-out device which concerns on this invention. It is a side view which shows the structure of the casing pulling-out device of embodiment. It is a top view which shows the state which operated the hydraulic jack of the casing pulling-out device of embodiment. It is an enlarged perspective view which shows the structure of the presser foot of the tip of the presser bar which constitutes the retaining unit, and the connecting ring attached to the end of a casing. (A) is a front view showing a specific example of a base plate, and (B) is a side view showing a state where a base plate is installed on a masonry wall. (A) to (i) are diagrams showing the procedure of the method of constructing the reinforcing body in the diagonal direction to the embankment of the station platform and the method of pulling out the casing by using the casing pulling device of the embodiment.

Hereinafter, an embodiment of the casing pulling device according to the present invention will be described in detail with reference to the drawings, but before the casing pulling device of the present embodiment is described, FIG. 1 is used to describe an embankment type station platform. The structure and examples of reinforcement will be briefly described.
As shown in FIG. 1A, the embankment type station platform 10 has a structure in which the inner embankment 13 is supported by a masonry wall 12 in which a plurality of masonry blocks 11 are stacked so as to form a vertical surface. In order to reinforce an existing embankment having such a structure, a columnar reinforcing body 20 formed by solidifying a self-curing filler (hereinafter, simply referred to as a filler) such as mortar or grout is placed in the embankment soil. It is buried.

The reinforcing body 20 is usually provided with an inclination so that the tip is lowered in order to enhance the reinforcing effect. Further, as shown in FIG. 1B, the reinforcing body 20 has a structure in which a reinforcing bar having a diameter of less than 20 mm is inserted as a core material 22 in the center of a columnar filler 21 having a diameter of about 150 mm. ..
In the reinforcing body 20 having such a structure, the steel pipe 23 as a casing is inserted while drilling the embankment of the station platform 10, the core material 22 is inserted in the center, the filler 21 is injected, and then the steel pipe 23 is pulled out and solidified. It is built by letting it. The reason for inserting the steel pipe is to prevent the peripheral wall of the hole from collapsing and crushing in the middle of the drilling due to the large earth pressure applied in the embankment.

It should be noted that the steel pipe 23 is not inserted with a long one, but is inserted while adding a steel pipe in the process of advancing the drilling using a short steel pipe. A male screw is formed on the outer circumference of one end of the short steel pipe to be used, a female screw is formed on the outer circumference of the other end, and the steel pipe to be added is rotated to form a male screw or the male screw at the end. The steel pipes are connected to each other by screwing the female screw into the female screw or the male screw at the end of the already embedded steel pipe.

Next, an embodiment of the casing pulling device according to the present invention will be described.
2 to 5 show an embodiment of the casing pulling device according to the present invention, of which FIG. 2 is a plan view of the casing pulling device constituting the casing pulling device, and FIG. 3 is a casing pulling device (connecting bar). 132a omitted), FIG. 4 is a plan view showing a state in which the casing pulling device hydraulic jack is expanded and contracted, and FIG. It is a perspective view which shows the structure of.

As shown in FIGS. 2 and 3, the casing pulling device 100 of the present embodiment is a pulling unit for grasping and pulling out the end portion of the steel pipe 23 as the casing inserted in the hole formed in the soil of the embankment. The device is held integrally with the 110, the retaining unit 120 for preventing leakage and disconnection of the filler and the core material inside the steel pipe when the steel pipe 23 is pulled out, and the drawing unit 110 and the retaining unit 120. A fixed frame unit 130 for fixing to the side surface of the masonry block 11 is provided.

Of each unit, the fixed frame unit 130 is rotatable at one end to a base plate 131 joined and fixed to the side surface of the masonry block 11 and a pair of outer support pieces 131a and 131b provided on both side edges of the base plate 131. It is provided with a pair of connecting bars 132a, 132b connected to the above, and a reaction force plate 133 having both ends coupled to the other ends of the connecting bars 132a, 132b and laid horizontally. As a result, the fixed frame unit 130 is configured as a frame body having a substantially rectangular shape when viewed from above. The connecting bars 132a and 132b and the reaction force plate 133 are detachably connected by pins 134a and 134b.

As shown in FIG. 6A, the base plate 131 has a U-shaped opening 131c formed in the center and bolt insertion holes 131d formed on both sides of the opening 131c. The insertion hole 131d is inserted into an embedded bolt previously fixed to the side surface of the masonry block 11 and fixed to the side surface of the masonry block 11 by screwing and tightening the nut.

Further, as shown in FIG. 2, a pair of inner support pieces 135a and 135b are firmly attached to the base plate 131 substantially in parallel with the pair of outer support pieces 131a and 131b. Shaft holes are formed in the outer support pieces 131a and 131b and the inner support pieces 135a and 135b, respectively, and the pin shafts 136a and 136b can be inserted so as to straddle the outer support pieces 131a and 131b and the inner support pieces 135a and 135b. It is configured in. Further, a shaft hole through which the pin shafts 136a and 136b are inserted is formed at the end of the connecting bars 132a and 132b, and the connecting bars 132a and 132b are connected to the base plate 131 by the pin shafts 136a and 136b.

The extraction unit 110 has a pair of connecting blocks 111a and 111b having shaft holes through which the pin shafts 136a and 136b can be inserted and rotatably connected to the pin shafts 136a and 136b, and pistons to the connecting blocks 111a and 111b. A pair of hydraulic jacks 112a and 112b to which rods are connected are provided. As a result, the hydraulic jacks 112a and 112b rotate around the pin shafts 136a and 136b, and the angle with respect to the base plate 131, that is, the inclination angle can be changed.

A support plate 114 whose both ends are connected by fixing plates 113a and 113b is laid horizontally on the cylinders of the hydraulic jacks 112a and 112b, and an annular push ring 115 is fixed to the central portion of the support plate 114. At the same time, a chuck 116 for grasping and gripping the outer periphery of the end portion of the steel pipe 23 as a casing is attached.
Note that FIG. 2 shows a state in which the hydraulic jacks 112a and 112b are contracted, and when the hydraulic jacks 112a and 112b are extended, as shown in FIG. 4, the chuck 116 grips the outer periphery of the end of the steel pipe 23 and is left. Since the steel pipe 23 is pulled out by the stroke of the jack, the chuck 116 is loosened to contract the jack, and the chuck 116 grips the outer circumference of the steel pipe 23 again to extend the jack. All can be pulled out.

The chuck 116 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the steel pipe to be pulled out and becomes thinner toward the tip (left side in the figure), and the outer chuck 116a integrally configured with the push ring 115. An inner chuck that has an inner diameter almost the same as the outer diameter of the steel pipe to be pulled out and has a cylindrical shape that becomes thinner toward the tip (to the right in the figure) and can be fitted inside the outer chuck 116a. It is equipped with 116b.

The outer chuck 116a has a tapered surface that contacts each other on the inner circumference and the inner chuck 116b has a tapered surface that contacts each other on the outer circumference, and the cylindrical inner chuck 116b has an axial slit. When pushed by the support plate 114 and moved to the left in the figure, the inner chuck 116b enters the inside of the outer chuck 116a like a wedge. Then, since the inner chuck 116b has a slit in the axial direction, its diameter becomes smaller, and the inner chuck 116b can further enter the inside of the outer chuck 116a and firmly grasp the outer periphery of the end portion of the steel pipe. The inner peripheral surface of the inner chuck 116b may be knurled (non-slip groove) having fine irregularities in order to increase the frictional force.

The retaining unit 120 has a holding rod 121 that can be screwed into a hexagon nut 137 fixed to the center of the reaction force plate 133 that constitutes the fixed frame unit 130, and a cylindrical shape that can be coupled to the end of a steel pipe as a casing. It has a connecting ring 122 and a core material presser 123 provided at the tip of the presser bar 121 (the end on the right side in the figure). A female screw is formed on the inner peripheral surface of the connecting ring 122, and the female screw is screwed to the male screw on the outer periphery of the end of the steel pipe 23 to be connected to the end of the steel pipe. Since the presser bar 121 is screwed into the hexagon nut 137, when the presser bar 121 is rotated, it moves in the axial direction with respect to the reaction force plate 133, whereby the core material presser 123 at the tip can be moved.

Further, the connecting ring 122 has a cylindrical guide portion 1 that guides the presser bar 121 in the center in the axial direction.
22a is provided, and as shown in FIG. 6, the guide portion 122a is coupled to the main body of the connecting ring 122 by the connecting portion 122b arranged radially. The guide portion 122a is formed with an insertion hole having a diameter substantially the same as the outer diameter of the presser bar 121, and no female screw is formed on the inner circumference of the insertion hole. Even if the ring 12223 is connected to the steel pipe, the presser bar 121 can freely move in the guide portion 122a in the axial direction.

The core material retainer 123 is formed with a recess in the center to which the end portion of the core material 22 constituting the reinforcing body 20 can be engaged. Further, as shown in FIG. 5, the core material retainer 123 includes a retainer piece 123a arranged radially in contact with the filler 21 of the reinforcing body 20. Although not shown, it is rotatably attached to the tip of the presser bar 121 so as not to fall off. Therefore, even if the presser bar 121 is rotated, the core material presser 123 does not rotate. That is, the presser rod 121 can be rotated and moved in a state where the core material presser 123 is in contact with the core material 22 and the filler 21 of the reinforcing body 20, and the core material presser 123 can be firmly pressed against the core material 22.

The presser bar 121 has a hexagonal hole formed on the end surface of the rear end (the left end in FIG. 2), and when a hexagonal bar wrench is inserted into this hexagonal hole and turned, the male screw becomes a hexagon nut 137. It can move in the axial direction by the reaction force generated by sliding along the female screw. Further, the male screw on the outer circumference of the presser bar 121 is formed as a square screw. As a result, when the pressing force acts on the pressing rod 121 from the core material pressing 123, the axial load can be firmly received and the load can be firmly transmitted to the reaction force plate 133.

Next, a method of constructing a reinforcing body in the diagonal direction on the embankment of the station platform and a method of pulling out the casing using the casing pulling device 100 having the above-mentioned configuration will be described with reference to FIG. 7.
When it is desired to construct a reinforcing body in the diagonal direction from the masonry wall 12 with respect to the embankment, first, the position and the inclination angle θ of the reinforcing body to be constructed are determined. Next, as shown in FIG. 7A, the core machine 200 for drilling is set at a predetermined position on the masonry wall 12 so as to have the above angle θ. Subsequently, the core machine 200 is operated, and as shown in FIG. 7B, a short steel pipe serving as a casing is inserted while drilling the masonry wall 12.

After that, as shown in FIG. 7 (c), drilling is advanced while adding a short steel pipe serving as a casing to the embankment (10). Further, when connecting the next steel pipe to the inserted steel pipe, the inside of the steel pipe tube is excavated as shown in FIG. 7 (d). Then, as shown in FIG. 7 (e), the drilling and excavation are repeated until the depth reaches a predetermined level.
Next, the core machine 200 is removed, and the core material 22 is inserted into the steel pipe tube as shown in FIG. 7 (f). Spacers 24 for holding the core material 22 in the center of the drilling hole are provided at the intermediate positions between the front end and the rear end of the core material 22 to be inserted. As the spacer 24, a spacer 24 having a radial presser piece 123a can be used as in the core material presser 123 provided at the tip of the presser bar 121 shown in FIG.

Then, as shown in FIG. 7 (g), a filler such as mortar is injected into the steel pipe tube to fill the steel pipe tube. Subsequently, as shown in FIG. 7 (h), the base plate 131 is installed on the side surface of the masonry wall 12, and the extraction device 100 of the embodiment is set at a predetermined position of the masonry wall 12 at a predetermined angle θ. do. Then, the steel pipe tube is pulled out while preventing the core material 22 from coming off and the filler from leaking by the core material presser 123.
When setting the extraction device 100 on the masonry wall 12, first, as shown in FIG. 6B, the base plate 131 is on the extension line of the center line C of the reinforcing body (drilling) B having the inclination angle θ. The base plate 131 is installed on the side surface of the masonry wall 12 so that the shaft holes H of the outer support pieces 131a and 131b and the inner support pieces 135a and 135b provided in the above are located.

Since the pin shaft, which is the rotation axis of the drawing unit 110, is inserted into the shaft hole H, the shaft hole H is drawn on the extension line of the center line C of the reinforcing body (drilling) B so that the shaft hole H can be pulled out later. When the unit 110 is set on the base plate 131 and tilted by θ with respect to the pin axis, the center line of the reinforcing body (drilling) H and the center line of the base plate 131 are aligned, and the steel pipe tube in the drilling is formed. When pulling out, the pulling force can be accurately applied in the direction of the angle θ to pull out.
When the drawing of the steel pipe tube is completed, as shown in FIG. 7 (i), the pulling device 100 and the base plate 131 are removed from the masonry wall 12, and the filler surface settled by the pulling is additionally injected to remove the filler surface at the mouth. Finish and complete a series of work.

According to the casing pulling device and the pulling method of the above embodiment, while pressing the core material and the filler in the casing (steel pipe tube), the outer circumference of the steel pipe is grasped by a chuck and the hydraulic jack is operated to pull out the casing. Therefore, it is possible to prevent the core material from coming off and the filler from leaking when the casing is pulled out.

Further, in the casing extraction device of the above embodiment, the extraction unit 110 is rotatably attached to the base plate 131 installed on the side surface of the masonry wall by the pin shafts 136a and 136b, and the load at the time of extraction is fixed to the fixed frame unit 130. Since the casing is received by the reaction force plate 133, the casing embedded in the diagonal direction can be pulled out without using a heavy machine or the like.
Furthermore, since the pull-out unit 110, the retaining unit 120, and the fixed frame unit 130 are configured to be separable from each other, they are easy to carry and can be easily assembled or disassembled in a narrow work space such as on a railroad track beside a station platform. There is an advantage that it can be done.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the core material presser 123 at the tip of the presser bar 121 is provided with the presser piece 123a arranged radially, but a notch or a small hole for injecting the filler is used. It is also possible to use the core material retainer 123 made of a disk having the above.
Further, in the above-described embodiment, the presser rod 121 is also used as a guide rod when the pull-out unit 110 moves, but the guide rod of the pull-out unit 110 may be provided separately from the presser rod 121. It is possible. However, the device can be downsized by using the presser rod 121 as a guide rod.

Further, in the above-described embodiment, the hydraulic jack is used as the pressure-type telescopic means for moving the gripping means (chuck), but the hydraulic jack or other liquid-operated jack, or the screw jack, rack-driven jack, or screw jack It is also possible to use such mechanical jacks, or pneumatically actuated jacks called air jacks.
Further, in the above-described embodiment, a case where a columnar reinforcing body for reinforcing the embankment of the station platform is applied to pulling out the casing when constructing the casing diagonally from the side surface of the masonry wall has been described as an example. The invention is not limited to this, and can also be used when constructing a reinforcing body or other structure oblique to the ground by using a casing.

10 Station platform embankment 11 Masonry block 12 Embankment wall 13 Embankment 20 Reinforcing material 21 Filler 22 Core material 100 Casing extraction device 110 Extraction unit 111a, 111b Connecting block (connecting member)
112a, 112b Hydraulic jack 115 Push ring 116a Outer chuck 116b Inner chuck 120 Retaining unit 121 Presser bar 122 Connecting ring 123 Core material pressing 130 Fixed frame unit 131a, 131b Support piece 132a, 132b Connecting bar 133 Reaction force plate 135a, 135b Support piece 136a, 136b Pin shaft

Claims (5)

The fixed frame unit provided with a base plate for attaching a device to a work object, a gripping means for gripping a part of a casing inserted in the ground, and a pressure type telescopic means for moving the gripping means. A casing withdrawal device including a withdrawal unit held by the unit and a retaining unit provided with a holding means inserted into the inlet of the casing to press the filler in the casing and held by the fixed frame unit. hand,
The end of the extraction unit is rotatably coupled to the base plate by a hinge structure.
The pressing means includes a pressing rod held by the fixed frame unit, and a pressing member provided at the tip of the pressing rod and capable of being fitted to the entrance portion of the casing.
The casing pulling device, wherein the holding rod is arranged so as to penetrate the gripping means of the pulling unit. The pressure type telescopic means is a hydraulic jack.
The base plate is provided with at least a pair of support pieces having shaft holes so as to project substantially parallel to the surface of the base plate opposite to the surface to be joined to the object.
A connecting member having a shaft hole is provided at the end of the hydraulic jack.
The first aspect of the present invention, wherein the hinge structure is formed by the shaft hole provided in the pair of support pieces and the pin shaft inserted into the shaft hole provided in the connecting member. Casing pulling device. The withdrawal unit includes two hydraulic jacks arranged substantially in parallel, and the gripping means is provided on a support plate laid horizontally between the cylinders of the two hydraulic jacks. Item 2. The casing extraction device according to Item 2. The fixed frame unit comprises a pair of connecting bars coupled to the base plate and a reaction force plate laid horizontally between the other ends of the connecting bars.
The retaining unit comprises a connecting ring coupled to the end of the casing to be pulled out.
A square screw is formed on the outer circumference of the presser bar.
A nut to which the square screw of the presser bar can be screwed is fixed to the reaction force plate.
The connecting ring is provided with a cylindrical guide member through which the holding rod is inserted so as to be movable in the axial direction.
The casing pulling device according to claim 2 or 3, wherein the gripping means includes a chuck that grips and grips the outer periphery of the casing. It is a casing pulling method using a pulling device equipped with a gripping means for gripping a part of a casing inserted in the ground and a pressure type telescopic means for moving the gripping means.
While pressing the filler in the casing by the pressing member that can be inserted into the inlet portion of the casing, the pressure type expansion / contraction means is operated to move the casing gripped by the gripping means and pull it out from the ground. A characteristic casing extraction method.

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