Ground mountain reinforcement pipe connection device

Abstract

To provide a tool for ground reinforcement pipe connection that allows core alignment work of ground reinforcement pipes to be simply carried out in a short time and also allows construction efficiency of ground reinforcement to be improved.SOLUTION: A tool 1 for ground reinforcement pipe connection is provided with: a first support part 2 placed at a position so as to project from a tip of a guide cell 11 and supporting a first ground reinforcement pipe 110 installed in the ground 100 so as to be positioned with the guide cell 11; a second support part 3 placed rearward and apart from the first support part 2 so as to position a second ground reinforcement pipe 120 to be connected by being pressed-in the first ground reinforcement pipe 110; and a connection rod 4 connecting the first support part 2 and the second support part 3, wherein the first support part 2 is formed engageably on a part of the circumference from the side of the first ground reinforcement pipe 110, and the first support part 2 and the second support part 3 are configured to allow the first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 to be supported coaxially.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a jig for connecting ground reinforcement pipes, which supports the ground reinforcement pipes when connecting and driving the ground reinforcement pipes into the ground. Ground reinforcement pipe connection device having It relates to.

Background Art

[0002] Conventionally, when performing ground reinforcement, a method of connecting and connecting a plurality of steel pipes, which are ground reinforcement pipes, in series and driving them into the ground is known. For example, in the face reinforcement of tunnel excavation work, as shown in FIG. 6, a plurality of steel pipes 220 are connected in series and driven into the ground toward the front upper part or the outer periphery of the ground 201 to form a long steel pipe 202. A long front receiving work 204 for injecting a ground improvement material from the driven long steel pipe 202 to form a consolidation region 203 and performing ground improvement of the ground 201, and a plurality of steel pipes 220 are connected in series and a long steel pipe 205 is driven from the face into the ground 201 in front. A long mirror reinforcement work 206 for injecting a ground improvement material from the driven long steel pipe 205 to perform ground improvement of the ground is being carried out.

[0003] When constructing the long front receiving work 204 or the long mirror reinforcement work 206, for example, in the tunnel space T, a steel pipe 220 with a drilling rod (not shown) inserted inside is mounted on the guide cell 209 of the drilling arm 208 of the drill jumbo 207, and the drilling machine 210 with the drilling rod connected on the guide cell 209 is advanced. Then, the steel pipe 220 is pulled or pushed into the ground 201 while drilling. When the first steel pipe 220 (220a) and the first drilling rod are driven into the ground 201 near the root, the work of connecting the subsequent second steel pipe 220 (220b) and the second drilling rod is performed. In many cases, about 4 steel pipes 220 of about 3 m are connected and driven (see FIGS. 6 and 7).

[0004] For the connection of the steel pipes of this ground mountain reinforcement pipe, there are methods of connecting using a threaded coupler and a method of forming male and female threads at the ends of the steel pipes and screwing them together. However, as in Patent Documents 1-3, there is also a method of pushing a subsequent steel pipe into a preceding steel pipe for connection. In the method of pushing a subsequent steel pipe into an already placed steel pipe for connection, the connection and joining of the steel pipes can be carried out by utilizing the pushing force generated by the advancement of the boring machine, reducing the work performed by workers on the high-altitude work platform and enabling an improvement in the work speed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in the method of pushing a second steel pipe into a first already placed steel pipe for connection, as shown in Fig. 7, it is necessary to move and arrange the guide cell 209 to accurately align the axis of the first steel pipe 220 (220a) with its rear end protruding from the face 211 and the axis of the subsequent second steel pipe 220 (220b) supported by the fixed centralizer 212 and the movable centralizer 213 for centering. However, this centering work is a difficult task that requires skill and time, where workers on the high-altitude work platform visually make fine adjustments to the position of the guide cell, and it becomes a factor reducing the construction efficiency.

[0007] The present invention is proposed in view of the above problems, and when pushing a subsequent ground reinforcement pipe into and connecting it to a ground reinforcement pipe that has already been driven, it enables the core alignment operation of the ground reinforcement pipe to be performed simply and in a short time, and can improve the construction efficiency of ground reinforcement. A jig for connecting ground reinforcement pipes Ground reinforcement pipe connection device having is provided for the purpose of achieving this.

Means for Solving the Problems

[0008] In the present invention The ground reinforcement pipe connection device is a ground reinforcement pipe connection device having a guide cell attached to the arm of a drill jumbo and a jig for connecting a ground reinforcement pipe installed in the guide cell, wherein the jig for connecting a ground reinforcement pipe is A first support portion is disposed at a position protruding from the tip of the guide cell and supports the first ground reinforcement pipe that has already been driven into the ground so as to position the first ground reinforcement pipe and the guide cell. A second support portion is disposed behind the first support portion at a distance from the first support portion and supports the second ground reinforcement pipe that is pushed into and connected to the first ground reinforcement pipe so as to position it. A connecting rod that connects the first support portion and the second support portion is provided. The first support portion is formed so as to be engageable with a part of the outer periphery of the first ground reinforcement pipe from the side of the first ground reinforcement pipe, and the first support portion and the second support portion are configured to be able to support the first ground reinforcement pipe and the second ground reinforcement pipe so that their axes coincide. According to this, the second ground reinforcement pipe is mounted on the guide cell and supported by the second support portion. In this state, when the guide cell is moved and the first ground reinforcement pipe is supported by the first support portion, the axes of the first ground reinforcement pipe and the second ground reinforcement pipe automatically coincide, and the second ground reinforcement pipe can be directly pushed into and connected to the first ground reinforcement pipe that has already been driven into the ground. Therefore, it is possible to eliminate the situation where the first ground reinforcement pipe is bent and the second ground reinforcement pipe cannot be pushed in and connected. At the same time, the core alignment operation of the ground reinforcement pipe can be performed very simply and in a short time, and the construction efficiency of ground reinforcement can be improved.

[0009] In the present invention In the ground reinforcement pipe connection device The jig for connecting the ground reinforcement pipes is formed such that the first support portion supports the first ground reinforcement pipe with the first notch recess, and the second support portion supports the second ground reinforcement pipe with the second notch recess, and the concave sides of the first notch recess and the second notch recess are arranged in opposite directions. According to this, the tip of the second ground reinforcement pipe is supported by the second notch recess so as to be pressed against the first notch recess side, and the tip of the second ground reinforcement pipe can be prevented from rising on the side opposite to the first notch recess with respect to the first ground reinforcement pipe supported by the first notch recess. The axial centers of the first ground reinforcement pipe supported by the first support portion and the second ground reinforcement pipe supported by the second support portion can be more reliably aligned and centered.

[0010] In the present invention In the ground reinforcement pipe connection device The jig for connecting the ground reinforcement pipes is characterized in that the second support portion is composed of a first semi-circular notch plate member and a second semi-circular notch plate member arranged at intervals, and a second connecting rod connecting the first semi-circular notch plate member and the second semi-circular notch plate member. According to this, by supporting the tip of the second ground reinforcement pipe with the first semi-circular notch plate member and the second semi-circular notch plate member arranged at intervals, the position of the axial center of the tip of the second ground reinforcement pipe can be more stably fixed.

[0011] In the present invention In the ground reinforcement pipe connection device The jig for connecting the ground reinforcement pipes is characterized in that a latching hook detachably latched to a fixed centralizer provided at the tip of the guide cell is formed on the rear side of the second support portion. According to this, by detachably latching the jig for connecting the ground reinforcement pipes to the fixed centralizer with the latching hook, the same jig for connecting the ground reinforcement pipes can be installed and used in another guide cell or another drill jumbo, and the versatility can be enhanced. Also, replacement is easy when the jig for connecting the ground reinforcement pipes is damaged or deteriorated.

Effects of the Invention

[0012] Fixture for connecting ground reinforcement pipes of the present invention Ground reinforcement pipe connection device having According to the present invention, when pushing and connecting a subsequent ground reinforcement pipe into an already placed ground reinforcement pipe, it is possible to easily and quickly perform the centering operation of the ground reinforcement pipe, and improve the construction efficiency of ground reinforcement.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0014] 〔Fixture for Connecting Ground Reinforcement Pipes of the Embodiment〕 Of the present invention In the ground reinforcement pipe connection deviceAs shown in FIGS. 1 to 3, the jig 1 for connecting the ground reinforcement pipes of the embodiment is arranged at a position protruding from the tip of the guide cell 11, and positions the first ground reinforcement pipe 110 already driven into the ground 100 and the guide cell 11. A first support portion 2 that supports the first ground reinforcement pipe 110, a second support portion 3 that is spaced apart from the first support portion 2 and is arranged behind the first support portion 2, and supports the second ground reinforcement pipe 120 that is pushed into and connected to the first ground reinforcement pipe 110, and a connecting rod 4 that connects the first support portion 2 and the second support portion 3. The first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 are preferably steel pipes, but ground reinforcement pipes made of other materials such as resin are also possible.

[0015] The first support portion 2 is a member in which a first notch recess 21 that is notched in a substantially semicircular shape is formed. The substantially semicircular first notch recess 21 is engaged with a part of the outer periphery of the first ground reinforcement pipe 110 from the side of the first ground reinforcement pipe 110 driven into the ground 100, so that the first ground reinforcement pipe 110 can be supported. The first support portion 2 in the illustrated example is a plate member in which the first notch recess 21 is recessed upward. The plate-shaped first support portion 2 is arranged so that the longitudinal direction of the guide cell 11 is substantially the normal line. One end of the rod-shaped or pipe-shaped connecting rod 4 is fixed to a portion of the first support portion 2 other than the first notch recess 21. In the illustrated example, one end of a pair of connecting rods 4 is fixed to positions on both sides of the first notch recess 21 in the plate-shaped first support portion 2, respectively.

[0016] The second support portion 3 has a second notch recess that is notched in a substantially semicircular shape. The second support portion 3 in the present embodiment is composed of a first semicircular notch plate member 30a and a second semicircular notch plate member 30b that are arranged at intervals. The first semicircular notch plate member 30a and the second semicircular notch plate member 30b are each arranged so that the longitudinal direction of the guide cell 11 is substantially the normal line.

[0017] In the first semi-circular notched plate member 30a, a second notched concave portion 31a, which is notched in a substantially semi-circular shape, is formed to be concave downward. In the second semi-circular notched plate member 30b, a second notched concave portion 31b, which is notched in a substantially semi-circular shape, is formed downward. In other words, the first support portion 2 and the second support portion 3 are arranged such that the concave sides of the first notched concave portion 21 of the first support portion 2 and the concave sides of the second notched concave portions 31a and 31b of the second support portion 3 are in opposite directions. The second notched concave portion 31a and the second notched concave portion 31b are respectively engaged with a part of the outer periphery of the second ground reinforcing pipe 120 to support the second ground reinforcing pipe 120.

[0018] The first semi-circular notched plate member 30a, which constitutes the second support portion 3 and is arranged on the tip side of the guide cell 11, has the other end of the rod-shaped or pipe-shaped connecting rod 4 fixed thereto. In the illustrated example, the other ends of a pair of connecting rods 4 are respectively fixed at positions on both sides of the second notched concave portion 31a in the first semi-circular notched plate member 30a. That is, the first support portion 2 and the first semi-circular notched plate member 30a are connected by the connecting rod 4, and thus the first support portion 2 and the second support portion 3 are connected by the connecting rod 4.

[0019] The first semi-circular notched plate member 30a and the second semi-circular notched plate member 30b, which constitute the second support portion 3, are connected by a rod-shaped or pipe-shaped second connecting rod 32. One end of the second connecting rod 32 is fixed to the first semi-circular notched plate member 30a, and the other end is fixed to the second semi-circular notched plate member 30b. In the illustrated example, one ends of a plurality of second connecting rods 32 are respectively fixed to the outer periphery of the second notched concave portion 31a of the first semi-circular notched plate member 30a, and the other ends of the plurality of second connecting rods 32 are respectively fixed to the outer periphery of the second notched concave portion 31b of the second semi-circular notched plate member 30b.

[0020] On the rear side of the second support portion 3, a latching hook 33 that is detachably latched to the fixed centralizer 12 is formed. In the illustrated example, a pair of hook-shaped latching hooks 33 are formed so as to protrude on the rear side of the second semi-circular cutout plate member 30b. The fixed centralizer 12 is in a substantially plate shape with a cutout recess 121 that is concave upward and notched to support the second ground reinforcement pipe 120 from below, and is fixedly provided at the tip of the guide cell 11. The latching hooks 33·33 of the second support portion 3 are detachably latched to the plate portions on both sides of the cutout recess 121 in the fixed centralizer 12.

[0021] The first support portion 2 and the second support portion 3 are configured to be able to support the first ground reinforcement pipe 110 already placed in the ground 100 and the second ground reinforcement pipe 120 arranged on the guide cell 11 so that their axes coincide. In the present embodiment, the axis of the first ground reinforcement pipe 110 engaged and supported by the first cutout recess 21 of the first support portion 2 and the axis of the second ground reinforcement pipe 120 engaged and supported by the second cutout recesses 31a, 31b of the second support portion 3 coincide.

[0022] When performing the ground reinforcement method using the ground reinforcement pipe connection jig 1 of the present embodiment, for example, a drilling rig having a guide cell 11 attached to the arm of a drill jumbo is used, and a hole drilling machine 13 is mounted on the guide cell 11 so as to be able to move forward and backward (see FIG. 4). On this guide cell 11, a centralizer for supporting a ground reinforcement pipe such as a steel pipe attached to the hole drilling machine 13 from below is provided. In the illustrated example, a fixed centralizer 12 is fixed at the leading position of the guide cell 11, and a movable centralizer 14 is provided so as to move forward and backward in a predetermined area on the guide cell 11. The hole drilling machine 13 moves forward and backward between the retracted position A1 and the advanced position A2, and the movable centralizer 14 moves forward and backward between the retracted position B1 and the advanced position B2 in conjunction with the movement of the hole drilling machine 13, although not at the same speed.

[0023] Although not shown, a drilling rod is inserted inside the ground reinforcement pipe, and a drilling bit at the tip of the drilling rod is engaged with the leading ground reinforcement pipe via a casing shoe at the tip of the leading ground reinforcement pipe. This engagement is achieved by the forward rotation of the drilling machine and disengaged by the reverse rotation. That is, when the first ground reinforcement pipe 110 already installed in the ground 100 is the leading pipe, it is engaged with the drilling bit at the tip of the first ground reinforcement pipe 110, and the drilling rod is inserted into the first ground reinforcement pipe 110.

[0024] The jig 1 for connecting ground reinforcement pipes is hooked by a hooking hook 33 to a fixed centralizer 12 that supports the ground reinforcement pipe mounted at the tip of the guide cell 11 from below, and is mounted so as to cover the fixed centralizer 12 from above. In the jig 1 for connecting ground reinforcement pipes thus mounted, for example, the first notch recess 21 of the first support portion 2 is arranged such that the concave side faces upward, and the second notch recesses 31a and 31b of the second support portion 3 are arranged such that the concave side faces downward. Ground reinforcement pipes such as the second ground reinforcement pipe 120 mounted on the guide cell 11 are positioned with their circumferences constrained by the fixed centralizer 12 and the second notch recesses 31a and 31b of the second support portion 3. Further, the first support portion 2 is arranged at a position protruding from the tip of the guide cell 11 so as to support the already installed first ground reinforcement pipe 110 from below.

[0025] When connecting the second ground reinforcement pipe 120 to the already placed first ground reinforcement pipe 110, when the first ground reinforcement pipe 110 enters the ground 100 and the drilled hole 102 of the mirror sprayed concrete 101 near the root, the guide cell 11 equipped with the second ground reinforcement pipe 120 is brought close while supporting the vicinity of the tip of the second ground reinforcement pipe 120 on the second support portion 3 of the ground reinforcement pipe connection jig 1, and lifted from bottom to top (see Fig. 5(a)). When the first support portion 2 of the ground reinforcement pipe connection jig 1 is moved and engaged with the already placed first ground reinforcement pipe 110 to support the first ground reinforcement pipe 110, the axis of the first ground reinforcement pipe 110 coincides with the axis of the second ground reinforcement pipe 120 supported by the second support portion 3 on the guide cell 11 (see Fig. 5(b)).

[0026] Next, as shown in Figs. 5(c) and 4(b), when the drilling machine 13 is advanced on the guide cell 11 to push the tip portion of the second ground reinforcement pipe 120 into the rear end portion of the first ground reinforcement pipe 110, the first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 with coinciding axes are accurately connected. Note that the first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 have a structure in which the subsequent ground reinforcement pipe is pushed into the preceding ground reinforcement pipe for connection. For example, an engaging member 130 formed in a substantially C shape is externally fitted on the outer periphery of the rear end portion of the first ground reinforcement pipe 110, while a fitting groove (not shown) into which the engaging member 130 is fitted from the inside is formed on the inner periphery of the tip portion of the second ground reinforcement pipe 120. The tip portion of the second ground reinforcement pipe 120 is pushed in so as to fit outside the rear end portion of the first ground reinforcement pipe 110, causing the engaging member 130 to slightly reduce in diameter. The engaging member 130 returns to its original diameter at the groove position of the second ground reinforcement pipe 110 and is fitted into the fitting groove, and the first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 are configured to be connected.

[0027] According to the jig 1 for connecting the ground reinforcement pipes of the present embodiment, the second ground reinforcement pipe 120 is mounted on the guide cell 11 and supported by the second support portion 3. In this state, when the guide cell 11 is moved and the first ground reinforcement pipe 110 is supported by the first support portion 2, the axes of the first ground reinforcement pipe 110 and the second ground reinforcement pipe 120 automatically coincide, and the second ground reinforcement pipe 120 can be directly pushed into the first ground reinforcement pipe 110 that has already been driven into the ground 100 to achieve a connectable state. Therefore, it is possible to eliminate the situation where the first ground reinforcement pipe 110 is bent and the second ground reinforcement pipe 120 cannot be pushed in and connected. At the same time, the centering operation of the ground reinforcement pipes 110 and 120 can be performed very simply and in a short time, improving the construction efficiency of ground reinforcement.

[0028] Further, by arranging the concave sides of the first notch recess 21 in the first support portion 2 and the concave sides of the second notch recesses 31a and 31b in the second support portion 3 in opposite directions, the tip of the second ground reinforcement pipe 120 is supported by the second notch recesses 31a and 31b so as to be pressed toward the first notch recess 21 side. It is possible to prevent the tip of the second ground reinforcement pipe 120 from rising on the side opposite to the first notch recess 21 with respect to the first ground reinforcement pipe 110 supported by the first notch recess 21, and the axes of the first ground reinforcement pipe 110 supported by the first support portion 2 and the second ground reinforcement pipe 120 supported by the second support portion 3 can be made to coincide more reliably and centered.

[0029] Also, as the second support portion 2, by supporting the tip of the second ground reinforcement pipe 120 with the first semi-circular notch plate 30a and the second semi-circular notch plate 30b arranged at intervals, the position of the axis of the tip of the second ground reinforcement pipe 120 can be more stably fixed.

[0030] In addition, by detachably hooking the jig 1 for connecting the ground reinforcement pipe to the fixed centering device 12 with the hanging hook 33, the same jig 1 for connecting the ground reinforcement pipe can be installed and used in another guide cell or another drill jumbo, thereby enhancing versatility. Also, replacement becomes easy when the jig 1 for connecting the ground reinforcement pipe is damaged or deteriorated.

[0031] 〔Scope of the Invention Disclosed in this Specification〕 The invention disclosed in this specification, in addition to each invention, embodiment, and example listed as the invention, within the applicable range, includes those obtained by changing these partial contents to other contents disclosed in this specification and specifying them, or by adding other contents disclosed in this specification to these contents and specifying them, or by deleting these partial contents to the extent that partial operational effects can be obtained and generalizing them to a higher concept and specifying them. And the invention disclosed in this specification also includes the following contents and the following further modification examples.

[0032] For example, the jig 1 for connecting the ground reinforcement pipe in the above embodiment is configured to be detachably installed on the fixed centering device 12 of the guide cell 11. However, the jig for connecting the ground reinforcement pipe of the present invention may be configured to be detachably installed on a part other than the fixed centering device 12 of the guide cell 11, or may be fixed to the tip of the guide cell 11 to constitute a part of the guide cell 11.

[0033] In addition, the second support portion 3 in the above embodiment is composed of the first semi-circular notch plate member 30a and the second semi-circular notch plate member 30b arranged at an interval. However, the second support portion in the present invention can have an appropriate configuration as long as it can support the second ground reinforcement pipe so as to position it. For example, it is also possible to configure the second support portion with only a single semi-circular notch plate member having a notch recess cut out in a substantially semi-circular shape.

[0034] In addition, the ground reinforcement pipe to be aligned, connected, and joined by the jig 1 for connecting the ground reinforcement pipes is preferably, for example, a connecting steel pipe or the like for auxiliary construction methods such as a long front receiver work or a long mirror reinforcement work for reinforcing the ground in front of the face during tunnel excavation. However, it may also be a connecting steel pipe or the like for connecting as a tunnel foot pile or side pile. Further, it is also applicable to the connection of the ground reinforcement pipe mounted on the guide cell with a steel pipe or the like and drilled and driven into the ground slope.

Industrial Applicability

[0035] The present invention can be used, for example, when connecting ground reinforcement pipes and driving them into the ground in tunnel excavation work.

Explanation of Symbols

[0036] 1... Jig for connecting ground reinforcement pipes 2... First support portion 21... First notch recess 3... Second support portion 30a... First semi-circular notch plate 30b... Second semi-circular notch plate 31a, 31b... Second notch recess 32... Second connecting rod 33... Hanging hook 4... Connecting rod 11... Guide cell 12... Fixed centering device 121... Notch recess 13... Drilling machine 14... Movable centering device 100... Ground 101... Shotcrete 102... Drilling hole 110... First ground reinforcement pipe 120... Second ground reinforcement pipe 130... Engaging member A1... Retracted position of the drilling machine A2... Advanced position of the drilling machine B1... Retracted position of the movable centering device B2... Advanced position of the movable centering device 201... Ground 202... Long steel pipe 203... Consolidated area 204... Long front receiver work 205... Long steel pipe 206... Long mirror reinforcement work 207... Drill jumbo 208... Drilling arm 209... Guide cell 210... Drilling machine 211... Face 212... Fixed centering device 213... Movable centering device 220, 220a, 220b... Steel pipe T... Tunnel space

Claims

Claim 1: A ground reinforcement pipe connection device having a guide cell attached to an arm of a drill jumbo and a jig for connecting a ground reinforcement pipe installed in the guide cell, wherein: the jig for connecting the ground reinforcement pipe is disposed at a position protruding from the tip of the guide cell, and has a first support portion that supports the first ground reinforcement pipe already driven into the ground so as to position the first ground reinforcement pipe and the guide cell; a second support portion that is disposed behind the first support portion at a distance from the first support portion and supports the second ground reinforcement pipe that is pushed into and connected to the first ground reinforcement pipe so as to position the second ground reinforcement pipe; a connecting rod that connects the first support portion and the second support portion; the first support portion is formed so as to be engageable with a part of the outer periphery of the first ground reinforcement pipe from the side of the first ground reinforcement pipe; the first support portion and the second support portion are configured to support the first ground reinforcement pipe and the second ground reinforcement pipe such that their axes are aligned; the first support portion is formed to support the first ground reinforcement pipe with a first notch recess, and the second support portion is formed to support the second ground reinforcement pipe with a second notch recess; A ground reinforcement pipe connection device, characterized in that the concave side of the first notch recess and the concave side of the second notch recess are arranged in opposite directions. Claim 2: A ground reinforcement pipe connection device having a guide cell attached to an arm of a drill jumbo and a jig for connecting a ground reinforcement pipe installed in the guide cell, wherein: the jig for connecting the ground reinforcement pipe is disposed at a position protruding from the tip of the guide cell, and has a first support portion that supports the first ground reinforcement pipe already driven into the ground so as to position the first ground reinforcement pipe and the guide cell; a second support portion that is disposed behind the first support portion at a distance from the first support portion and supports the second ground reinforcement pipe that is pushed into and connected to the first ground reinforcement pipe so as to position the second ground reinforcement pipe; a connecting rod that connects the first support portion and the second support portion; the first support portion is formed so as to be engageable with a part of the outer periphery of the first ground reinforcement pipe from the side of the first ground reinforcement pipe; the first support portion and the second support portion are configured to support the first ground reinforcement pipe and the second ground reinforcement pipe such that their axes are aligned; The ground reinforcement pipe connection device is characterized in that the second support portion is composed of a first semi-circular notch plate member and a second semi-circular notch plate member which are arranged at intervals, and a second connecting rod which connects the first semi-circular notch plate member and the second semi-circular notch plate member.

3. A ground reinforcement pipe connection device having a guide cell attached to an arm of a drill jumbo and a jig for connecting a ground reinforcement pipe installed in the guide cell, wherein the jig for connecting the ground reinforcement pipe is a first support portion which is arranged at a position protruding from the tip of the guide cell and supports the first ground reinforcement pipe so as to position the first ground reinforcement pipe already driven into the ground and the guide cell; a second support portion which is arranged behind the first support portion at a distance from the first support portion and supports the second ground reinforcement pipe which is pushed into and connected to the first ground reinforcement pipe so as to position the second ground reinforcement pipe; a connecting rod which connects the first support portion and the second support portion; the first support portion is formed so as to be engageable with a part of the outer periphery of the first ground reinforcement pipe from the side of the first ground reinforcement pipe; the first support portion and the second support portion are configured to be able to support the first ground reinforcement pipe and the second ground reinforcement pipe so that their axes coincide; a latching hook which is detachably latched to a fixed centralizer provided at the tip of the guide cell is formed on the rear side of the second support portion.

Images