JPH063107B2 - How to install the starting and reaching part of the shaft for the propulsion method - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application]
The present invention relates to a method for installing a starting part or a reaching part in a starting or reaching shaft used for propulsion laying a sheath for cables or other pipes for various purposes.

[Prior art]

Conventionally, as a method of laying a pipe body in the ground, a vertical shaft having a starting opening and a vertical shaft having a reaching opening are submerged in the ground, and a pipe is installed by a propulsion device installed in the starting vertical shaft. A construction method is known in which the starting opening is propelled into the ground to reach the inside of the reaching opening in the reaching shaft.

When carrying out this method, if the ground near the starting part or the reaching part of the shaft is soft, earth and sand will enter the shaft through the opening of the shaft. As a countermeasure against this, a chemical liquid injection device is installed on the ground, and the device is used to perforate from the ground to an appropriate depth in the ground, and then the ground strengthening chemical liquid is injected.

However, in the case of the above-mentioned conventional chemical injection method, since the chemical injection device is installed on the ground to perform the perforation and the chemical injection work, a wide working space is required around the shaft on the ground and the opening for starting the shaft is used. It is difficult to reliably inject the chemical liquid only into the ground in front of the portion or the access opening, and since the chemical liquid is injected into a place other than the necessary place, wasteful consumption of the chemical liquid is large and it is uneconomical. In addition, there is a problem that the groundwater and the ground are contaminated when a chemical solution is injected into the ground.

[Object and Structure of Invention]

An object of the present invention is to provide a method for installing a starting and reaching part of a shaft for a propulsion method, which can advantageously solve the above-mentioned problems, and a gate valve is provided on an inner wall surface of a steel shaft 1 submerged in the ground. The rotation moving member 5 which fixes the front part of the valve box 3 of No. 2 and which has the annular cutter 4 for cutting attached to the front part can be freely rotated and slid by the lid / support frame 6 fixed to the rear part of the valve box 3. And then the gate valve 2 is opened and mud pressure is applied to the inside of the valve box 3 and the lid / support frame 6 while the annular moving member 5 is rotated to move forward, An opening 7 is formed in the vertical shaft 1 by the annular cutter 4, and then the rotary moving member 5 and the annular cutter 4 are formed.
Then, the cutout plate body 8 is moved backward to close the gate valve 2, the muddy water in the lid / support frame 6 is discharged, and then the lid / support frame 6 is removed from the valve box 3 to remove the cutout plate body 8. A temporary lid unit 11 consisting of a lid holding cylinder 9 and a temporary lid 10 made of a non-metallic low-strength material fixed inside the lid holding cylinder 9 is attached to the front of the rotation moving member 5, and then the lid / support frame 6 is opened. It is fixed to the rear part of the box 3, and then, while the mud pressure is applied to the valve box 3 and the lid / support frame 6 and the gate valve 2 is opened, the temporary moving unit 11 is advanced by the rotary moving member 5 to move the vertical shaft. After the muddy water in the valve box 3 and the lid / support frame 6 is drained, the lid holding cylinder 9 is fixed to the vertical shaft 1 and the gate valve 2, lid / support frame 6 And removing the parts attached to it A first invention is a method for installing a starting and reaching portion of a shaft for a propulsion method, and the front end portion of the valve box 3 of the gate valve 2 is provided around an opening 13 provided in a part of the fastening band 12 in the circumferential direction. Gate valve 14 with fixed and tightening band
The gate valve 14 with a tightening band is inserted into the steel shaft 1 that is sunk in the ground, and is tightened and fixed by the tightening band 12, and the cutout annular cutter 4 is attached to the front part. The rotation moving member 5 is rotatably and slidably supported by the lid / support frame 6 fixed to the rear portion of the valve box 3, and then the gate valve 2 is opened and the valve box 3 and the lid / support are supported. In a state where mud pressure is applied in the frame 6, the rotary moving member 5 rotates the cutting annular cutter 4 to move forward, and the cutting annular cutter 4 makes an opening 7 in the vertical shaft 1. After the rotary moving member 5, the annular cutter 4 and the cutout plate 8 are moved backward to close the gate valve 2, muddy water in the lid / support frame 6 is removed, and then the lid / support frame 6 is attached to the valve box 3. Remove from the cutout plate body Taken out, and rotational movement member 5
After attaching the excavating cutter 15 to the front part of the, the lid / support frame 6 is fixed to the rear part of the valve box 3, and then the mud pressure is applied to the inside of the valve box 3 and the cover / support frame 6 and the gate valve 2 The excavation cutter 15 is moved forward by the rotary moving member 5 to excavate the ground in front of the opening 7 of the shaft 1, and then the rotary moving member 5 and the excavating cutter 15 are moved backward to open the gate. After closing the valve 2, the muddy water in the lid / support frame 6 is discharged, then the lid / support frame 6 is removed from the valve box 3, the excavation cutter 15 is removed from the rotary moving member 5, and the rotary moving member 5 is removed. A lid holding cylinder 9 on the front and a temporary lid 10 made of a non-metallic low-strength material fixed inside the lid holding cylinder 9.
After attaching the temporary lid unit 11 consisting of and, the lid / support frame 6 is fixed to the rear part of the valve box 3, and then the mud pressure is applied to the inside of the valve box 3 and the lid / support frame 6 and the gate valve 2 is attached. In the opened state, the temporary moving unit 11 is moved forward by the rotation moving member 5 to be fitted into the opening 7 of the vertical shaft 1, and then the muddy water in the valve box 3 and the supporting / supporting frame 6 is discharged. 9 is fixed to the shaft 1 and the gate valve 14 with the tightening band, the lid / support frame 6 and the parts attached thereto are removed. 2 It is an invention.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

FIG. 10 and FIG. 11 show a gate valve 14 with a tightening band used in an embodiment of the present invention, which is a pair of substantially semicircular steel band members having flanges 16 at both ends. 17, 18 are arranged so as to form a partially notched circle, and a tightening screw rod 19 is inserted through a through hole provided in the opposing flange 16, and the screw rod 19 has a surface on which each flange 16 is attached. The tightening nut 20 to be engaged and the fixing nut 21 to be engaged with the back surface of each of the flanges 16 are screwed together, and each of the band component members 1 is
The tightening band 12 is constituted by 7, 18 and the tightening screw 20 in which the tightening nut 20 and the fixing nut 21 are screwed together.

A circular opening 13 is formed in the center of one of the band components 17.
At the front end portion of the valve box 3 in the gate valve 2 provided with the valve plate 23 that is moved up and down by the hydraulic cylinder 22.
3 is arranged so as to surround 3 and is fixed to the inner surface of the band component member 17 by welding, and an annular groove 24 surrounding the opening 13 is provided on the outer surface of the band component member 17, and the sealing material 25 is provided in the annular groove 24. Is fitted into the valve box 3, and a lid 27 is attached to a bolt 28 in a welding opening 26 provided in the upper portion of the valve box 3.
, And a muddy water injection / exhaust pipe 30 equipped with an on-off valve 29 is connected to the lower portion of the valve box 3.
The tightening band 12, the gate valve 2 and the respective parts attached thereto constitute a tightening band equipped gate valve 14.

FIG. 12 shows a drive unit 31 used in an embodiment of the present invention, in which a hollow rotary moving member is provided at the center of a box-shaped lid / support frame 6 having a connecting annular flange 32 at its front end. 5 is rotatably and slidably fitted, a driven gear 33 is fixed to the rear end portion of the rotation moving member 5, and the cylinder 35 in the moving hydraulic cylinder 34 extending in the front-rear direction is the rotating A front end portion of a guide member 36 which is inserted into the moving member 5 and the driven gear 33 and is rotatably supported via a bearing so as not to move in the front-rear direction, and further extends in the front-rear direction has a front end portion of the cover / support frame 6. A movable frame 37 fixed to the rear end portion of the cylinder 35 is slidably inserted into the guide member 36 via a slide bearing, and the movable hydraulic cylinder is moved. The rear end of the fourth piston rod 38 and the rear end portion of the guide member 36 are connected via a connecting member 39.

A rotation driving device 40 composed of a hydraulic motor is fixed to the moving frame 37, and a driving gear 41 fixed to a rotation shaft of the rotation driving device 40 is meshed with the driven gear 33 and the rotation moving member 5 is rotated. A large number of screw holes 42 for mounting a center drill are provided around the center side portion, a large number of screw holes 44 are formed in a mounting flange 43 on the front part of the rotary moving member 5, and the cover / support frame is also used. A muddy water injection / exhaust pipe 46 having an opening / closing valve 45 is connected to the lower part of 6.

13 and 14 show a center drill 47 with a plate locking piece used in an embodiment of the present invention, which is a mounting plate 4 having a large number of bolt insertion holes in its periphery.
A center drill 49 is fixed to the center of the hollow shaft 8, and the hollow drill shaft 50 of the center drill 49 is provided with slits 51 on both sides in the diametrical direction. A plate locking piece 53 having an inclined surface 52 inclined so as to be separated from the peripheral surface of 50 is arranged, and the front end of the plate locking piece 53 is pivotally attached to the hollow drill shaft 50 by a support shaft 54, Further, a stopper 55 that engages with the inner surface of the hollow drill shaft 50 is continuously provided at the rear end of the plate locking piece 53, and each plate locking piece 5
An extruding spring 56 is interposed between the rear end portions of the three.

FIG. 15 and FIG. 16 show a temporary lid unit 11 used in an embodiment of the present invention, in which an inward flange 57 is continuously provided at the front end of a steel lid holding cylinder 9 having a circular cross section. On the inner surface of the inward flange 57, an outer peripheral side portion of a rubber water stop ring 58 and a steel pressing ring 59 are sequentially superposed and fixed by a bolt 60, and the lid holding cylinder 9
A steel bearing ring 61 is fixed to the inner periphery of the middle portion of the by welding, and an annular protrusion 62 engaged with the inner wall surface of the shaft is integrally provided on the outer periphery of the middle portion of the lid holding cylinder 9. In the lid holding cylinder 9, a temporary lid 10 made of a non-metallic low strength material such as foam concrete or hard foam urethane is integrally provided between the rubber water stop ring 58 and the steel bearing ring 61.

The gate valve 14 with the tightening band, the drive unit 31,
Center drill 47 with plate locking piece and temporary lid unit 1
When installing a starting part or reaching part in the shaft 1 using 1 etc., first, as shown in FIGS. 1 and 2, at a predetermined level in the steel shaft 1 sunk in the ground, Insert the gate valve 14 with a tightening band, and then each band component 1
In the state where 7 and 18 are pressed against the inner wall surface of the shaft 1, the gate valve 14 with the tightening band is tightened and fixed to the shaft 1 by the tightening screw 19, the tightening nut 20 and the fixing nut 21.
When the band components 17 and 18 are pressed against the vertical shaft 1, the fixing nut 21 may be pressed in a relaxed state by a hydraulic jack interposed between the opposed flanges 16, or the fixing nut 21 may be pressed. The tightening nut 20 may be rotated and pressed in a loosened state.

Next, the center drill 47 with the plate locking piece is attached to the rotary movement member 5
In the state in which the inward flange of the cutout annular cutter 4 is fixed to the mounting flange 43 of the rotary moving member 5 by the bolt 64, and the moving hydraulic cylinder 34 is shortened, while being fixed to the center of the front end of the. , The annular flange on the front end of the lid / spindle frame 6 to the valve box 3
It is fixed by bolts 65 to the annular flange at the rear end.

Next, as shown in FIG. 3, the gate valve 2 is opened to supply muddy water such as bentonite muddy water into the valve box 3 and the lid / support frame 6 through the muddy water injection / exhaust pipe 30 or the muddy water injection / exhaust pipe 46, and A predetermined muddy water pressure is applied to the inside of the valve box 3 and the lid / support frame 6, and then the rotation driving device 40 is operated to rotate the rotary moving member 5, the cutout annular cutter 4 supported thereby, and the plate locking. Center drill with piece 4
While rotating 7 and 7, the moving hydraulic cylinder 34 is extended to move the rotation moving member 5, the cutting annular cutter 4 and the center drill 47 with a plate locking piece forward.

In this way, the center drill 49 firstly pierces the central hole of the steel vertical shaft 1, and then the starting portion or the reaching portion of the vertical shaft 1 is cut out by the cutout annular cutter 4 to form the opening 7, and When the hollow drill shaft 50 moves forward through the center hole formed in the vertical shaft 1 by the drill 49, the plate engaging piece 53 is pushed into the hollow drill shaft 50 by the hole edge of the center hole, and then the plate member engagement. Stop piece 53
When passes through the cutout plate body 8, the plate body locking piece 53 is pressed by the pushing spring 56 to project from the hollow drill shaft 50, and faces the entire surface of the cutout plate body 8.

Next, as shown in FIG. 4, the moving hydraulic cylinder 34 is shortened to rotate the rotary moving member 5. After the lid / support frame 4, the center drill 47 with a plate locking piece and the cutout plate 8 are moved backward, the gate valve 2 is closed and the muddy water in the lid / support frame 6 is discharged from the muddy water injection / discharge pipe 46.
Next, after removing the lid / support frame 6 from the valve box 3,
The cutout annular cutter 4 and the center drill 47 with a plate locking piece are removed from the rotation moving member 5, and the cutout plate 8 is removed from the center drill 47 with a plate locking piece.

Next, as shown in FIG. 5, the excavating cutter 15 including a steel cylindrical body 66 having a mounting inward flange at the rear end and an excavating blade 67 fixed to the inside of the cylindrical excavator 15 is attached to the rotary moving member 5 After being fixed to the mounting flange 43 by bolts, the front end portion of the lid / support frame 6 is connected to the rear end portion of the valve box 3 again, and then muddy water is injected into the lid / support frame 6 from the muddy water injection / discharge pipe 46. Supply and open gate valve 2.

Next, the rotation driving device 40 is operated to rotate the rotary moving member 5 and the excavating cutter 15, while the moving hydraulic cylinder 34 is extended to move the rotary moving member 5 and the excavating cutter 15 forward. . By doing so, in a state in which mud pressure is applied to the ground in front of the opening 7 provided in the vertical shaft 1, the ground is excavated by the excavation cutter 15 and a temporary lid pushing recess is provided.

Next, the moving hydraulic cylinder 34 is shortened, the rotary moving member 5 and the excavating cutter 15 are moved backward, and then the gate valve 2 is closed to remove the muddy water in the lid / support frame 6 from the muddy water injection and discharge pipe 46. After discharging, and then taking out the lid / support frame 6 from the valve box 3, the excavating cutter 15 is removed from the rotary moving member 5.

Next, as shown in FIG. 6, the holding cylinder 68 is fixed to the mounting flange 43 of the rotary moving member 5 with bolts, and the rear portion of the lid holding cylinder 9 of the temporary lid unit 11 is fitted into the holding cylinder 68. After that, the front end portion of the lid / support frame 6 is again connected to the rear end portion of the valve box 3, then muddy water is supplied from the muddy water injection / discharge pipe 46 into the lid / support frame 6, and the gate valve 2 is opened. .

Next, as shown in FIG. 7, the moving hydraulic cylinder 34 is extended to move the rotation moving member 5 and the temporary lid unit 11 forward, and the temporary lid unit 11 is fitted into the opening 7 of the vertical shaft 1. At the same time as inserting, the annular projection 62 is pressed against the inner surface of the vertical shaft 1. Next, after draining the muddy water in the valve box 3 and the lid / support frame 6, the lid 27 of the welding opening 26 at the upper portion of the valve box 3 is removed.

Next, a welding rod is inserted from the welding opening 26 to join the upper portion of the annular projection 62 of the lid holding cylinder 9 and the vertical shaft 1 by welding, and then the lid / support frame 6 is removed from the valve box 3. Remove and remove from the shaft, then tightening band 1
The diameter of 2 is reduced, and the gate valve 14 with the tightening band is removed from the shaft 1 to the state shown in FIG. 8, and as shown in FIG. After being welded to No. 1, the rear end portion of the lid holding cylinder 9 protruding toward the center of the shaft from the annular projection 62 is melted and removed.

When the temporary lid unit 11 installed as described above is used as the starting portion of the propulsion pipe body, first, as shown in FIG. 17, a floor concrete 69 is placed at the bottom of the vertical shaft 1 and the floor concrete 69 is placed. After the concrete 69 is hardened, a tube body is provided with a hydraulic jack for propulsion, a plurality of thrust fixing devices 71, a reaction force bearing member 72, etc. on a level adjustment support member 70 placed on the concrete 69. The propulsion device 73 is suspended, and the frame 74 of the propulsion device 73 for burying the pipe body is fixed to the vertical shaft 1 by the thrust fixing device 71.

Next, equipped with a cutter drive device consisting of a hydraulic motor,
And, the leading propulsion pipe 76 having the excavation cutter 75 rotated at its front end at the front end is set on the pipe body burying propulsion device 73, and then the leading propulsion is performed while rotating the excavation cutter 75. By propelling the pipe 76 forward, the excavating cutter 75 pierces the temporary lid 10 and, as shown in FIG. 18, propels the leading propulsion pipe 76 through the temporary lid 10 into the ground. I will do it.
After the leading propulsion pipe 76 has been propelled for a predetermined stroke, another pipe is connected to the rear end of the leading propulsion pipe 76 to perform propulsion again, and subsequently the pipes are sequentially added to propel the ground. .

The propulsion device 73 for burying a pipe is disclosed in Japanese Patent Application No. 60-1.
Those shown in No. 77484 or those having a known arbitrary structure may be used.

In the case where the present invention is carried out, when the ground at the opening of the vertical shaft 1 is a soft water-containing ground, the temporary cover unit 11 is moved by the pressing force of the moving hydraulic cylinder 34 without excavating by the excavating cutter 15. The temporary lid unit 1 is press-fitted into the soft water-containing ground and is pressed by the hydraulic cylinder 34 for movement.
When it is difficult to press-fit 1 into the water-containing ground, as described above, the ground in front of the opening 7 is excavated by the excavation cutter 15 to form a recess, and then the moving hydraulic cylinder 34 is used to move the temporary lid unit. 11 is propelled into the opening 7 and the recess.

As means for fixing the front part of the valve box 3 in the gate valve 2 to the vertical shaft 1, for example, a plurality of holding metal fittings are fixed around the vertical box 1 in the vertical shaft 1 by welding or the like.
The front flange of the valve box 3 may be fastened and fixed to the vertical shaft 1 by a bolt screwed to the holding metal fitting.

When carrying out the present invention, the annular projection 62 on the outer periphery of the lid holding cylinder 9 in the temporary lid unit 11 may be omitted, and as means for rotating and moving the rotation moving member 5,
Any means other than those shown may be adopted.

〔The invention's effect〕

According to the present invention, the rotary moving member 5 having the front part of the valve box 3 of the gate valve 2 fixed to the inner wall surface of the steel shaft 1 sunk in the ground and having the cutout annular cutter 4 attached to the front part thereof is provided. , Is rotatably and slidably supported by a lid / support frame 6 fixed to the rear portion of the valve box 3, and then the gate valve 2 is opened and a mud pressure is applied to the valve box 3 and the lid / support frame 6. In this state, the rotation moving member 5 rotates the annular cutter 4 to move forward, and the annular cutter 4 advances the shaft 1
Since the opening 7 is bored in the shaft 1, the opening 7 can be provided in the vertical shaft 1 without causing the water-containing earth and sand to flow into the vertical shaft 1 even if the ground at the starting part or the reaching part is a soft hydrous ground. Further, after the rotation moving member 5, the annular cutter 4 and the cutout plate 8 are moved backward to close the gate valve 2, muddy water in the lid / support frame 6 is discharged, and then the lid / support frame 6 is opened in the valve box. 3, the cut-out plate body 8 is taken out, and the lid holding cylinder 9 is attached to the front portion of the rotation moving member 5.
After mounting a temporary lid unit 11 consisting of a temporary lid 10 made of a non-metallic low strength material fixed therein, the lid / support frame 6 is fixed to the rear portion of the valve box 3, and then the valve box 3 and the lid are fixed. With the mud pressure acting on the dual-purpose support frame 6 and the gate valve 2 opened, the temporary moving unit 11 is moved forward by the rotary moving member 5 and fitted into the opening 7 of the vertical shaft 1, and then the valve box 3 and After the muddy water in the lid / support frame 6 is discharged, the lid holding cylinder 9 is fixed to the vertical shaft 1, so that the non-metallic low-cutting material that can be easily cut by the excavating cutter 75 does not flow the water-containing earth and sand into the vertical shaft 1. The temporary lid unit 11 having the temporary lid 10 made of a strong material can be easily fitted and fixed to the opening 7 of the vertical shaft 1, so that the starting portion or the reaching portion of the vertical shaft for propulsion method can be installed without performing chemical injection. Because groundwater and ground are contaminated That it can be prevented. Further, the front end of the valve box 3 of the gate valve 2 is fixed around the opening 13 provided in a part of the tightening band 12 in the circumferential direction to form the gate valve 14 with the tightening band, whereby the vertical shaft 1
The gate valve 2 can be fixed to and removed from the shaft easily and quickly. Further, after the opening 7 is provided in the vertical shaft 1, the excavation cutter 15 is fixed to the front part of the rotary moving member 5, and the excavation thereof is performed. By excavating the ground in front of the opening 7 with the cutting tool 15 to form a recess, the temporary lid unit 11 is opened in the opening 7 even if the ground is relatively hard.
Therefore, it is possible to obtain an effect that it can be easily pushed into the ground.

[Brief description of drawings]

1 to 16 show an embodiment of the present invention, in which FIG. 1 is a vertical sectional side view showing a state in which preparation for drilling an opening in a steel shaft has been completed, and FIG. Partial cross-sectional plan view, FIG. 3 is a vertical cross-sectional side view showing a state in which an opening is formed in a vertical shaft, and FIG. 4 is a cutout plate body and an annular cutter for cuttingout held by a center drill with a plate body locking piece. Fig. 5 is a vertical sectional side view showing a state in which the excavator is moved backward, Fig. 5 is a vertical sectional side view showing a state in which an excavation cutter is attached to the front part of the rotary moving member, and Fig. 6 is a temporary lid unit on the front part of the rotary moving member. Fig. 7 is a vertical sectional side view showing a state in which the temporary lid unit is attached to the opening of the vertical shaft. Fig. 9 is a vertical side view showing the device removed from the shaft, and Fig. 9 shows the temporary lid unit. That is a vertical sectional side view showing a state in which the entire periphery was then welded to the vertical shaft and blowing removing vertical shaft within the projecting portion of the lid holding tube of the lid holding cylinder. FIG. 10 is a vertical sectional side view showing a gate valve with a tightening band used in an embodiment of the present invention, FIG. 11 is a partially transverse plan view thereof, and FIG. 12 shows a drive unit used in the embodiment of the present invention. FIG. 13 is a vertical sectional side view, FIG. 13 is a partial vertical sectional side view showing a center drill with a plate locking piece used in an embodiment of the present invention, FIG. 14 is a vertical sectional front view thereof, and FIG. 15 is an embodiment of the present invention. FIG. 16 is a vertical sectional side view of the temporary lid unit used in FIG. FIG. 17 is a partial vertical cross-sectional side view showing a state where the preparation for the leading propulsion pipe is completed, and FIG. 18 is a partial vertical side view showing the state where the leading propulsion pipe is being propelled. In the figure, 1 is a steel shaft, 2 is a gate valve, 3 is a valve box,
4 is an annular cutter for cutting out, 5 is a rotary moving member, 6 is a supporting and supporting frame, 7 is an opening, 8 is a cutout plate, 9 is a lid holding cylinder, 10 is a temporary lid, 11 is a temporary lid unit, 12 is a A tightening band, 13 is an opening, 14 is a gate valve with a tightening band, 15 is an excavating cutter, 17 and 18 are steel band components, 19 is a tightening rod, 20 is a tightening nut, 2
3 is a valve plate, 26 is a welding opening, 27 is a lid, 30 is a muddy water injection and discharge pipe, 31 is a drive unit, 34 is a hydraulic cylinder for movement, 36 is a guide member, 37 is a moving frame, 3
8 is a piston rod, 39 is a connecting member, 40 is a rotation driving device, 46 is a muddy water injection and discharge pipe, 47 is a center drill with a plate locking piece, 49 is a center drill, 53 is a plate locking piece, 5
5 is a stopper, 56 is an extrusion spring, 66 is a steel cylindrical body,
67 is a digging blade.

Claims (2)

[Claims] 1. A rotary moving member 5 having a front portion of a valve box 3 of a gate valve 2 fixed to an inner wall surface of a steel shaft 1 sunk in the ground, and a ring-shaped cutting cutter 4 attached to the front portion. It is rotatably and slidably supported by a lid / support frame 6 fixed to the rear portion of the valve box 3, and then the gate valve 2 is opened and muddy water pressure is applied to the valve box 3 and the lid / support frame 6. In this state, the rotation moving member 5 rotates the annular cutter 4 to move forward, the opening 7 is formed in the vertical shaft 1 by the annular cutter 4, and then the rotation moving member 5 and the annular cutter 4 are formed.
Then, the cutout plate body 8 is moved backward to close the gate valve 2, the muddy water in the lid / support frame 6 is discharged, and then the lid / support frame 6 is removed from the valve box 3 to remove the cutout plate body 8. After taking out and attaching the lid holding cylinder 9 and the temporary lid unit 11 consisting of the temporary lid 10 made of a non-metallic low strength material fixed inside the lid holding cylinder 9 to the front part of the rotary moving member 5, the lid / support frame 6 is opened. It is fixed to the rear part of the box 3, and then, while the mud pressure is applied to the valve box 3 and the lid / support frame 6 and the gate valve 2 is opened, the temporary moving unit 11 is advanced by the rotary moving member 5 to move the vertical shaft. 1 is inserted into the opening 7,
Next, after draining the muddy water in the valve box 3 and the lid / support frame 6, the lid holding cylinder 9 is fixed to the vertical shaft 1 and the gate valve 2, the lid / support frame 6 and the respective parts attached thereto are removed. A method for installing a starting and reaching part of a shaft for a propulsion method, characterized by: 2. A gate valve with a tightening band is constructed by fixing the front end of a valve box 3 of the gate valve 2 around an opening 13 provided in a part of the tightening band 12 in the circumferential direction. The rotary valve member having the tightening banded gate valve 14 inserted into the steel shaft 1 sunk in the ground, tightened and fixed by the tightening band 12, and the cutout annular cutter 4 attached to the front part. 5 is rotatably and slidably supported by a lid / support frame 6 fixed to the rear portion of the valve box 3, and then the gate valve 2 is opened and at the same time the valve box 3 and the lid / support frame 6 are supported. With the muddy water pressure applied, the rotary moving member 5 rotates the cutting annular cutter 4 to move forward, the cutting annular cutter 4 makes an opening 7 in the vertical shaft 1, and then the rotational movement is performed. The member 5, the annular cutter 4 and the cutout plate body 8 After retreating and closing the gate valve 2, muddy water in the lid / support frame 6 is removed, then the lid / support frame 6 is removed from the valve box 3, the cutout plate body 8 is taken out, and a rotary moving member is provided. After attaching the excavation cutter 15 to the front part of 5, the lid / support frame 6 is fixed to the rear part of the valve box 3, and then the mud pressure is applied to the valve box 3 and the cover / support frame 6 and the gate valve is operated. In the state where 2 is opened, the excavation cutter 15 is moved forward by the rotational movement member 5 to excavate the ground in front of the opening 7 of the shaft 1, and then the rotational movement member 5 and the excavation cutter 15 are moved backward. After closing the gate valve 2, the muddy water in the lid / support frame 6 is discharged, then the lid / support frame 6 is removed from the valve box 3, the excavation cutter 15 is removed from the rotary moving member 5, and the rotary moving member 5 is removed. Lid holding tube in front of After mounting a temporary lid unit 11 consisting of a temporary lid 10 made of a non-metallic low strength material fixed therein, the lid / support frame 6 is fixed to the rear portion of the valve box 3, and then the valve box 3 and the lid are fixed. With the mud pressure acting on the dual-purpose support frame 6 and the gate valve 2 opened, the temporary moving unit 11 is moved forward by the rotary moving member 5 and fitted into the opening 7 of the vertical shaft 1, and then the valve box 3 and After draining the muddy water in the lid / support frame 6, fix the lid holding cylinder 9 to the vertical shaft 1 and remove the gate valve 14 with the fastening band, the lid / support frame 6 and the respective parts attached thereto. The method for installing the starting and reaching part of the vertical shaft for propulsion method.