Steel pipe fore-supporting method, drilling machine and steel pipe lifting device

Abstract

To improve construction efficiency.SOLUTION: The present invention is a steel pipe fore-supporting method in which a steel pipe 5 is driven into the natural ground 3 ahead in the excavation direction of a tunnel 1 while being supplemented. The method includes a driving step in which a steel pipe 5 is driven from a predetermined position at a face 2 of the tunnel 1 using a drilling device 20 capable of driving a steel pipe 5 installed in a guide cell 21 into the natural ground 3 while drilling a hole, an installation step in which, after the driving step is completed, the drilling device 20 is maintained in the position in the driving step, and a new steel pipe 5 is lifted by a steel pipe lifting device 15 capable of lifting the steel pipe 5 and installed in the guide cell 21, and a connection step in which the steel pipe 5 driven in the driving step and the new steel pipe 5 installed in the guide cell 21 in the installation step are connected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a steel pipe fore-supporting method, a drilling machine, and a steel pipe lifting device. [Background technology]

[0002] As a method for reinforcing the ground when excavating a tunnel, a steel pipe forepiling method is known in which a drilling device is used to drive steel pipes into the ground ahead in the direction of tunnel excavation while adding to them (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-156117 A Summary of the Invention [Problem to be solved by the invention]

[0004] When adding a steel pipe, it is necessary to lower the drilling device from the construction position to the ground, load the new steel pipe, and return it to the construction position, which reduces construction efficiency. In addition, when returning it to the construction position, it is necessary to align it with the previously driven steel pipe, which reduces construction efficiency. The object of the present invention is to improve construction efficiency. [Means for solving the problem]

[0005] In order to solve the above problems, the invention described in claim 1 is: In the steel pipe fore-supporting method, steel pipes are driven into the ground ahead of the tunnel in the direction of excavation while being added to, A driving process of driving a steel pipe from a predetermined position at the tunnel face using a drilling device capable of driving a steel pipe installed in a guide cell into the natural ground while drilling a hole; After the driving step is completed, the hole drilling device is maintained in the position in the driving step, and a new steel pipe is lifted by a steel pipe lifting device capable of lifting the steel pipe and installed in the guide cell. The method further comprises a connecting process for connecting the steel pipe driven in the driving process to the new steel pipe installed in the guide cell in the installation process.

[0006] The invention described in claim 2 is A boring machine capable of driving steel pipes into the ground of a tunnel while adding to it, A drilling device capable of driving a steel pipe installed in a guide cell into the natural ground while drilling a hole; and a steel pipe lifting device that can lift a new steel pipe to the hole drilling device located at the position where the steel pipe is to be driven and place it in the guide cell.

[0007] The invention described in claim 3 is the drilling machine described in claim 2, A man gauge is provided that can accommodate an operator and can be moved to a position adjacent to the drilling device that is in a position to drive the steel pipe; The man gauge is characterized by being equipped with the steel pipe lifting device.

[0008] The invention as set forth in claim 4 is the drilling machine as set forth in claim 2, The drilling device is A connecting device is provided for connecting the driven steel pipe and the new steel pipe to the guide cell, The connecting device is characterized by comprising a detection means capable of detecting when the end of the steel pipe reaches a position where it can be connected in the connecting device when the steel pipe is driven into the connecting device.

[0009] The invention described in claim 5 is the drilling machine described in claim 4, The present invention is characterized in that it comprises a delivery means for delivering the end of the new steel pipe placed in the guide cell to a position in the connecting device where it can be connected.

[0010] The invention described in claim 6 is A steel pipe lifting device for use in the drilling machine according to claim 2, A mounting unit capable of mounting the steel pipe; and a hoisting device that suspends the mounting portion by a wire rope and lifts the mounting portion by winding up the wire rope, The hoisting device includes: The reel is characterized by having a fitting portion that fits with the mounting portion when the mounting portion is wound up to the top of the possible winding range, thereby suppressing the swinging of the mounting portion.

[0011] The invention described in claim 7 is the steel pipe lifting device described in claim 6, The mounting unit includes: The present invention is characterized by comprising a fixing means for fixing the mounted steel pipe to the mounting portion. Effect of the Invention

[0012] According to the present invention, construction efficiency can be improved. [Brief description of the drawings]

[0013] [Figure 1] This is a diagram illustrating the state of a drilling machine being placed in a tunnel under construction. [Diagram 2] FIG. 4 is a diagram illustrating the state in which a steel pipe is lifted by a steel pipe lifting device. [Diagram 3] FIG. 4 is a diagram illustrating the state in which a steel pipe is lifted by a steel pipe lifting device. [Figure 4] FIG. 2 is a perspective view of a centralizer. [Diagram 5] FIG. 2 is a perspective view of a centralizer. [Figure 6] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. [Figure 7] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. [Figure 8] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. [Figure 9] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. [Figure 10] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. [Figure 11] FIG. 2 is a diagram illustrating the steps of the steel pipe pre-supporting method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment relates to a steel pipe forepiling method such as the AGF method, in which a drilling machine 10 as shown in Fig. 1 is used to drill holes in the ground 3 ahead of the tunnel face 2 in the excavation direction from the tunnel face 2 while driving steel pipes 5, thereby reinforcing the ground 3. In this steel pipe forepiling method, multiple steel pipes 5 are driven in one after another, and after the driving of the previous steel pipe 5 is completed, a new steel pipe 5 is connected to the previous steel pipe 5, and the driving is repeated to drive the steel pipe 5 of the desired length into the ground 3.

[0015] The drilling machine 10 is equipped with a traveling carriage 11 capable of traveling on the ground 4 of the tunnel 1, a man cage 14 on which a worker can ride, and a drilling device 20 capable of driving a steel pipe 5 into the ground while drilling a hole. The man gauge 14 and the drilling device 20 are mounted on a traveling cart 11 via a boom 12, and can be moved by operating the boom 12. The mangauge 14 and drilling device 20 are provided in pairs on each side of the traveling carriage 11, with the mangauge 14 and drilling device 20 provided on the right side of the traveling carriage 11 mainly performing construction on the right side of the face 2, and the mangauge 14 and drilling device 20 provided on the left side of the traveling carriage 11 mainly performing construction on the left side of the face 2.

[0016] A steel pipe lifting device 15 is provided on the side of the mangauge 14 that is closer to the side wall of the tunnel 1, for lifting the steel pipe 5 to be extended to the drilling device 20. The steel pipe lifting device 15 is provided on the rear side, closer to the traveling carriage 11 than the center of the mangauge 14, and is provided at a position away from the face 2 with respect to the center of the mangauge 14. As shown in FIGS. 2 and 3, the steel pipe lifting device 15 comprises a mounting unit 60 capable of mounting a steel pipe 5 thereon, and a hoisting device 70 capable of hoisting the mounting unit 60 via a wire rope 68.

[0017] Three support claws 61 capable of supporting the steel pipe 5 from below are provided on the lower part of the mounting part 60 so as to be aligned in the extension direction of the steel pipe 5. The support claws 61 are provided so as to extend toward the side where the hole drilling device 20 is located, so that the steel pipe 5 can be inserted and removed from the side where the hole drilling device 20 is located. In addition, the support claw 61 located between the support claws 61 at both ends is provided at a position closer to the face 2 and further forward than the midpoint between the support claws 61 at both ends.

[0018] Since the steel pipe lifting device 15 is provided on the man gauge 14, the steel pipe 5 can be installed and checked at a position close to the worker on board, improving the efficiency of construction. Also, the steel pipe lifting device 15 is provided on the rear side away from the face 2 from the center of the man gauge 14, and since it is easier for the worker on board to work and check from the front side of the steel pipe lifting device 15, it is provided shifted forward from the midpoint of the support claws 61 on both ends.

[0019] Furthermore, a fixing member 62 for preventing the loaded steel pipe 5 from falling off is provided on the side of the support claw 61 located at the front end. This fixing member 62 is a ring-shaped member having an inner diameter larger than the outer diameter of the steel pipe 5, and is divided into upper and lower halves, namely, a lower half 62a which is the lower member and an upper half 62b which is the upper member.

[0020] The side surface of the lower half portion 62a is fixed to the side portion of the support claw 61, so that when the steel pipe 5 is loaded, the steel pipe 5 is positioned above the lower half portion 62a. The ends of the lower half 62a and the upper half 62b closest to the man gauge 14 are connected via a hinge having a rotation axis along the extension direction of the steel pipe 5 to be mounted, so that the upper half 62b can be converted between a state in which it is retracted from above the steel pipe 5 and a state in which it is hung over the above the steel pipe 5. Furthermore, a connecting member 62c that detachably connects the lower half 62a and the upper half 62b is provided at the ends of the lower half 62a and the upper half 62b that are farther from the man gauge 14, and the steel pipe 5 can be fixed to the mounting part 60 by connecting the upper half 62b to the lower half 62a in a state where the upper half 62b is hung over the top of the steel pipe 5. By providing such a fixing member 62, it is possible to prevent the steel pipe 5 from falling off the mounting part 60, and construction can be performed safely.

[0021] A hanging portion 65 for hanging a wire rope 68 is provided on the upper portion of the mounting portion 60. The hanging portion 65 is a rectangular columnar member provided along the extending direction of the steel pipe 5, and pulleys 66 for guiding the wire rope 68 are provided on both ends. The wire rope extending from the hoisting device 70 passes under the pulley 66 at one end of the hanging part 65, reaches under the pulley 66 at the other end, and is hung so as to reach the hoisting device 70. As a result, the mounting part 60 is suspended by two wire ropes 68 aligned in the extension direction of the steel pipe 5, thereby suppressing horizontal rotation of the steel pipe 5. In addition, the hanging portion 65 is arranged to overlap the upper side of the support claw 61, so that when the mounting portion 60 is lifted with the steel pipe 5 loaded thereon, the support claw 61 becomes approximately horizontal due to the balance between the weight of the steel pipe 5 and the weight of the mounting portion 60.

[0022] The hoisting device 70 has a main body 71 fixed to the man cage 14 and is provided with a hoist 72 at its upper portion for winding up the wire rope 68. The hoist 72 includes a drum that winds up the wire rope 68 and a motor that drives and rotates the drum, and can wind and unwind the wire rope 68 by rotating the drum with the motor.

[0023] A wire rope 68 extending from the drum of the hoisting machine 72 passes under two pulleys 66 of the mounting part 60, and its end is fixed to the main body part 71 of the hoisting device 70. This makes it possible to move the mounting part 60 up and down by rotating the drum. In addition, a groove-shaped fitting portion 73 that opens downward is provided below the hoisting machine 72. As shown in Fig. 3, the hanging portion 65 of the mounting portion 60 fits into this fitting portion 73 when the mounting portion 60 is wound up to the top of the possible winding range, so that the rocking of the mounting portion 60 can be suppressed and the steel pipe 5 can be easily installed on the hole drilling device 20.

[0024] As shown in Figures 1 and 6, the drilling device 20 comprises a guide cell 21 extending along the drilling direction, a drifter 30 and a centralizer 40 movable along the guide cell 21, and a connecting device 22 provided at the end of the guide cell 21 on the drilling side. A drifter 30 for drilling and a centralizer 40 for supporting the steel pipe 5 are arranged movable along the extension direction at the top of the guide cell 21, and these move to the end on the drilling side as the drilling progresses. A rod 23 inserted inside a steel pipe 5 is connected to the output shaft 31 of the drifter 30, and a bit 24 is connected to the end of the rod 23 on the drilling side. Driving the drifter 30 drives the bit 24, which can drill a hole in the natural ground 3 by rotating and striking it.

[0025] The drifter 30 is also provided with a sending means 32 capable of sending out a new steel pipe 5 placed in the guide cell 21 in the drilling direction. The sending means 32 has a substantially semicircular holding portion 33 capable of holding an end of the steel pipe 5. The substantially semicircular holding portion 33 opens in the direction facing the man gauge 14, so that the new steel pipe 5 lifted by the steel pipe lifting device 15 can be easily received.

[0026] The holding part 33 can be moved in the hole-drilling direction by a driving source such as a hydraulic cylinder or a motor, and can be converted into a retracted state as shown in Figure 10 and an extended state as shown in Figure 11. This allows the end of the new steel pipe 5 on the hole-drilling side to be fed into a predetermined position within the connecting device 22. By providing such a sending means 32, workers are no longer required to move the steel pipes 5 at high altitudes, which reduces the burden on workers and enables construction to be carried out safely.

[0027] As shown in Fig. 6, a laser distance meter 26 is provided at the rear end of the guide cell 21. A target 34 is provided at the rear end of the drifter 30, and the laser distance meter 26 can measure the distance L to the target 34, as shown by the dashed line in the figure. This laser distance meter 26 makes it possible to detect when the end of the steel pipe 5 reaches a position where it can be connected in the connecting device 22 when driving the steel pipe 5. The laser distance meter 26 is attached to the guide cell 21 with an insulator that absorbs vibrations between them, so that vibrations during construction do not affect the measurement. In this way, by providing a detection means capable of detecting that the end of the steel pipe 5 has reached a position where it can be connected in the connecting device 22, the worker does not need to visually check the position of the steel pipe 5, which reduces the burden on the worker and enables safe construction. In addition, the accuracy of construction can be improved.

[0028] As shown in FIGS. 4 and 5, the centralizer 40 includes a base 42 attached to a movable body 41 that is movable on the guide cell 21, and a locking piece 47. Two support members 43 are arranged on the base 42 in the drilling direction, side by side with a gap 44 between them. An arc-shaped recess 45 is formed on the upper surface of the support member 43, into which the steel pipe 5 to be installed fits.

[0029] The locking piece 47 is an arc-shaped plate-like member, and is disposed in the gap 44 provided between the support members 43. An arc-shaped slit 48 is formed in the locking piece 47 so as to penetrate the plate surface. A guide shaft (not shown) is provided on the surface of the support member 43 facing the gap 44, and by inserting this guide shaft into the slit 48, the locking piece 47 can slide so as to draw an arc along the extension direction of the slit 48. In other words, the centralizer 40 allows the locking piece 47, which can hold the steel pipe 5, to move along the circumferential direction of the steel pipe 5.

[0030] In addition, the locking piece 47 has a plurality of fixing holes 49 formed below the slit 48, penetrating the plate surface. The support member 43 has an insertion hole through which the fixed shaft 46 can be inserted at a position that can face the fixing hole 49, and the locking piece 47 can be fixed by inserting the fixed shaft 46 with the insertion hole and the fixing hole 49 aligned. The locking piece 47 has a plurality of fixing holes 49, and the locking piece 47 can be fixed at any position. In this example, the locking piece 47 has a fixing hole 49 that can fix the position of the locking piece 47 to the position shown in FIG. 4 and a fixing hole 49 that can fix the position of the locking piece 47 to the position shown in FIG. 5. In addition, a fixing hole 49 that can fix the locking piece 47 at the center position between the positions shown in FIG. 4 and FIG. 5 is also provided. Of course, the fixing hole 49 may be provided at a position other than these.

[0031] When installing the steel pipe 5 in the guide cell 21, the pipe must be installed so as to climb over the locking piece 47, which may cause the locking piece 47 to become an obstacle and make the work difficult depending on the position or inclination of the guide cell 21. However, by making the position of the locking piece 47 changeable, it is possible to efficiently proceed with the work regardless of the position or inclination of the guide cell 21.

[0032] As shown in FIG. 6, the connecting device 22 is cylindrical with an insertion portion through which the steel pipe 5 can be inserted, and the insertion portion is provided with a cylinder for pressing the inserted steel pipe toward the center to squeeze it. The steel pipe 5 has a small diameter section 5a in a specified range on one end, the outer diameter of which is equal to or smaller than the inner diameter of the other end, and this small diameter section 5a can be inserted into the end of another steel pipe 5. The two steel pipes 5 are connected by crimping the inserted portion by squeezing it from the outside using a connecting device 22.

[0033] Next, a construction method using the above-described drilling machine 10 will be described. First, as shown in Figure 6, a first steel pipe 5 is placed in the guide cell 21 of the drilling device 20 that has been lowered to a position close to the ground 4. A drilling unit 25 with a bit 24 attached to its tip is placed in the connecting device 22, and the drilling unit 25 is connected to the end of the steel pipe 5 on the drilling side by the connecting device 22. Furthermore, a rod 23 connected to the bit 24 and inserted inside the steel pipe 5 is connected to the output shaft 31 of the drifter 30. Then, the drilling device 20 is moved to a predetermined position at the face 2 of the tunnel 1 where the steel pipe 5 is to be driven, and the man gauge 14 carrying the worker is moved to a position adjacent to the drilling device 20 to perform adjustment work such as adjusting the driving angle. After that, the driving process is performed in which the steel pipe 5 is driven into the natural ground 3 while drilling the hole.

[0034] In the driving process, the position of the drifter 30 is monitored by measuring the distance L to a target 34 attached to the drifter 30 with a laser range finder 26, as shown by the dashed lines in Figures 6 and 7. Since the positions of the drifter 30 and the steel pipe 5 are fixed, it becomes possible to grasp the position of the end of the steel pipe 5. When this measurement result reaches a value indicating that the end of the steel pipe 5 has reached a position where it can be connected to the connecting device 22 as shown in Figure 7, the drilling is stopped and the driving process is completed.

[0035] 8, while the hole drilling device 20 is maintained in the position for the driving process, the output shaft 31 of the drifter 30 is released from the rod 23 and the drifter 30 is moved backward. Then, the mounting part 60 of the steel pipe lifting device 15 provided on the man gauge 14 located adjacent to the hole drilling device 20 is lowered to the ground 4, and a new steel pipe 5 with the rod 23 inserted therethrough is mounted on the mounting part 60 and fixed by the fixing member 62.

[0036] Thereafter, the steel pipe 5 is lifted as shown in Fig. 9, and the mounting part 60 is raised to the uppermost position within the range in which it can be wound up as shown in Fig. 10. As a result, the hanging part 65 fits into the fitting part 73, and the swinging of the mounting part 60 is suppressed. Then, a new steel pipe 5 is installed in the guide cell 21. The new steel pipe 5 is installed so that the end on the drifter 30 side is held by the holding part 33 of the delivery means 32, and is thus held by the holding part 33 and the centralizer 40. When installing this steel pipe 5, the work can be made easier by previously setting the locking pieces 47 of the centralizer 40 to a state that does not interfere with the installation of the steel pipe 5. Furthermore, the fixing of the fixing member 62 is released, and the mounting part 60 is retracted from the steel pipe 5, completing the installation process.

[0037] After the installation process is completed, the rod 23 of the new steel pipe 5 is connected to the rod 23 of the driven steel pipe 5, and the drifter 30 is moved in the hole-drilling direction as shown in Figure 11, while the delivery means 32 is extended in the hole-drilling direction, so that the new steel pipe 5 is delivered to a position in the connecting device 22 where it can be connected. The end of the steel pipe 5 at the driving completion position is in a position where it can be connected to the connecting device 22, and by sending a new steel pipe 5 to the connecting position in the connecting device 22, the small diameter portion 5a of the new steel pipe 5 is inserted into the end of the driven steel pipe 5. By operating the connecting device 22 in this state, the steel pipes 5 are connected. Furthermore, the rod 23 of the new steel pipe 5 is connected to the output shaft 31 of the drifter 30, completing the connecting process. Thereafter, the above-mentioned driving, installation and connection steps are repeated to drive the steel pipe to the desired length.

[0038] According to the above-described steel pipe pre-receiving method, drilling machine 10 and steel pipe lifting device 15, when installing a new steel pipe 5 in the drilling device 20, there is no need to lower the drilling device 20 to the ground 4, thereby improving construction efficiency. Furthermore, since the installation process is performed while maintaining the hole drilling device 20 in the position it was in during the driving process, there is no need to perform adjustment work to adjust the position of the hole drilling device 20 after installing a new steel pipe 5, which improves construction efficiency as well as construction accuracy. Furthermore, by configuring the man gauge 14 to lift the steel pipe 5, the man gauge 14 can also be maintained in a position adjacent to the hole drilling device 20, improving the efficiency of construction. In particular, since a new steel pipe 5 is lifted after the driving process of the previous steel pipe 5 is completed, the steel pipe 5 is not placed on the man gauge 14 except during the installation process, and it does not get in the way during construction.

[0039] In the above embodiment, the hoisting machine 72 is provided on the upper part of the main body 71 in the hoisting device 70, but the hoisting machine 72 may be provided in a position other than this. For example, the hoisting machine 72 may be provided so that the upper end of the hoisting machine 72 is located lower than the upper end of the main body 71. By doing so, construction can be carried out even in a position close to the wall of the tunnel 1. As a configuration of the hoisting device 70 taking into consideration the construction close to the wall of the tunnel 1, the hoist 72 may be provided at a position lower than the position of the upper end of the mounting part 60 when the mounting part 60 is wound up to the top of the possible winding range. Also, the hoist 72 may be provided at a position lower than the upper end of the man cage 14, or the upper end of the hoisting device 70 may be located at a position lower than the upper end of the man cage 14.

[0040] Further, the hoisting device 70 in which the mounting part 60 is suspended by a wire rope has been given as the steel pipe lifting device 15 for lifting the new steel pipe 5, but any device capable of lifting the new steel pipe 5 from the ground 4 to the hole drilling device 20 at the construction position will do. For example, the device may be configured with the mounting part 60 on a boom, or with a lift that lifts the mounting part 60 from below. Furthermore, the steel pipe lifting device 15 is not limited to being provided on the hole drilling machine 10, and may be provided on a machine separate from the hole drilling machine 10.

[0041] In addition, when driving the steel pipe 5, a laser rangefinder 26 was used as a detection means capable of detecting that the end of the steel pipe 5 has reached the driving completion position, which is a position where it can be connected in the connecting device 22, but other configurations may be used as long as they are capable of detecting that the driving completion position has been reached. For example, a sensor may be provided in the guide cell 21 that can detect when the drifter 30 reaches the driving completion position by generating an electrical or mechanical change when the drifter 30 reaches the driving completion position. In addition, a measuring device capable of measuring distance based on the length of a measuring wire may be provided at the rear end of the guide cell 21, and the measuring wire may be connected to the drifter 30 to measure the distance between the measuring device and the drifter 30, thereby detecting when the driving completion position has been reached.

[0042] Furthermore, although three support claws 61 are provided on the mounting portion 60, the number may be two, or four or more. The fixing member 62 may be provided on any of the support claws 61, or may be provided at a location other than the support claws 61, and may be of any type as long as it can fix the steel pipe 5 to the mounting portion 60. Furthermore, the method of supporting the steel pipe 5 on the mounting portion 60 is not limited to using the support claws 61, and may be of any type as long as it can hold the steel pipe 5 on the mounting portion 60.

[0043] In addition, the driving process, installation process and connection process may be performed by a worker riding on the mancage 14, or some or all of the processes may be performed by an operator not riding on the mancage 14 but operating from a position away from the drilling device 20. The drilling machine 10 of this embodiment is equipped with a laser range finder 26, so that the progress of the driving process can be grasped even from a position distant from the hole drilling device 20. In addition, since the drilling machine 10 is equipped with the connecting device 22 and the delivery means 32, the steel pipes 5 can be connected even from a position distant from the hole drilling device 20 in the connecting process.

[0044] Furthermore, the drilling machine 10 and the steel pipe lifting device 15 are not limited to the steel pipe fore-receiving method described above, but can also be used for other construction methods that include a process of driving the steel pipe 5 into the ground 3 of the tunnel 1 while adding to it.

[0045] Furthermore, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0046] 1. Tunnel 2. Cutting Edge 3. Ground 5 Steel pipe 10 Drilling Machine 14 Mangauge 15 Steel pipe lifting device 20 Drilling Equipment 21 Guide Cell 22 Coupling device 26 Laser range finder (detection means) 32 Transmission means 60 Mounting section 62 Fixing member (fixing means) 70 Hoisting device 73 Fitting part

Claims

1. In the steel pipe fore-supporting method, steel pipes are driven into the ground ahead of the tunnel in the direction of excavation while being added to, A driving process of driving a steel pipe from a predetermined position at the tunnel face using a drilling device capable of driving a steel pipe installed in a guide cell into the natural ground while drilling a hole; After the driving step is completed, the hole drilling device is maintained in the position in the driving step, and a new steel pipe is lifted by a steel pipe lifting device capable of lifting the steel pipe and installed in the guide cell. A steel pipe pre-supporting method, comprising: a connecting process for connecting the steel pipe driven in the driving process to the new steel pipe installed in the guide cell in the installation process.

2. A boring machine capable of driving steel pipes into the ground of a tunnel while adding to it, A drilling device capable of driving a steel pipe installed in a guide cell into the natural ground while drilling a hole; A drilling machine characterized by being equipped with a steel pipe lifting device that can lift a new steel pipe to the drilling device located at a position to drive the steel pipe and place it in the guide cell.

3. A man gauge is provided that can accommodate an operator and can be moved to a position adjacent to the drilling device that is in a position to drive the steel pipe; 3. The drilling machine according to claim 2, characterized in that the man gauge is provided with the steel pipe lifting device.

4. The drilling device is A connecting device is provided for connecting the driven steel pipe and the new steel pipe to the guide cell, 3. A drilling machine as claimed in claim 2, further comprising a detection means for detecting when the end of the steel pipe reaches a position where it can be connected in the connecting device when the steel pipe is driven.

5. 5. A drilling machine as claimed in claim 4, further comprising a delivery means for delivering the end of the new steel pipe placed in the guide cell to a position in the connecting device where it can be connected.

6. A steel pipe lifting device for use in the drilling machine according to claim 2, A mounting unit capable of mounting the steel pipe; and a hoisting device that suspends the mounting portion by a wire rope and lifts the mounting portion by winding up the wire rope, The hoisting device includes: A steel pipe lifting device characterized in that it is provided with an engaging portion that engages with the mounting portion when the mounting portion is wound up to the top of the possible winding range, thereby suppressing the swinging of the mounting portion.

7. The mounting unit includes:

7. A steel pipe lifting device according to claim 6, further comprising a fixing means for fixing the loaded steel pipe to the loading portion.

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