JP4198289B2 - Continuous drilling method between horizontal and inclined shafts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for continuously excavating a tilt shaft from a horizontal shaft or a horizontal shaft from a tilt shaft with a single tunnel excavator.
[0002]
[Prior art]
Conventionally, for example, in order to excavate an inclined shaft such as a hydraulic pipeline of a hydroelectric power plant in a mountainous ground, first, after excavating a horizontal shaft A with a tunnel excavator, as shown in FIG. 11 and FIG. After transporting the carriage D on which the inclined shaft excavator C is mounted from the horizontal shaft A to the excavation position of the inclined shaft B to be excavated on the rail R laid on the bottom surface of the horizontal shaft A, the inclined shaft excavator C is The inclined excavator C is started after being inclined obliquely upward. At this time, it is necessary to tilt the inclined shaft excavator C in the inclined shaft excavating direction.
[0003]
Therefore, in the conventional method, after excavating the starting inclined shaft portion E obliquely upward toward the inclined shaft B to be excavated from the horizontal shaft A, the pulley F, the rope G, the winch H, etc. are moved to the starting inclined shaft portion E and the horizontal shaft A. The tilt shaft excavator C is lifted obliquely upward and the front end portion of the tilt shaft excavator C is inserted into the starting tilt shaft portion E, and then the tilt shaft excavator C is started to excavate the tilt shaft B.
[0004]
[Problems to be solved by the invention]
However, according to such a tilt shaft excavation method, the removal work of the tunnel excavator that excavated the horizontal shaft A, the excavation work of the start tilt shaft portion E, the operation of carrying the tilt shaft excavator B to the start tilt shaft portion E, the start tilt shaft portion Not only does it require a lot of labor and labor, such as attaching pulley F or rope G to E or horizontal pit A, but also the tilt digging machine C is reluctant during the pulling work with the rope and its posture is unstable. As a result, there are problems such as danger in the work and a reduction in work efficiency. Further, after the preparation for the start of the inclined shaft excavator C toward the starting inclined shaft portion E is completed, there is a problem that it is necessary to remove the pulley F, the rope G, the winch H, and the like.
[0005]
The present invention has been made in view of such problems, and the object of the present invention is to enable a single tunnel excavator to smoothly and continuously excavate a horizontal shaft from a horizontal shaft or a horizontal shaft from a shaft. to provide a continuous drilling method of the horizontal mine and inclined shaft you.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the continuous excavation method between a horizontal shaft and a tilt shaft according to the present invention, the main gripper disposed at the rear portion of the excavator body is crimped to the excavation wall surface as described in claim 1. Using the tunnel excavator constructed to extend the tunnel by extending the thrust jack with the front gripper supported and the front gripper being unbonded from the excavation wall surface, the inclined shaft is removed from the horizontal shaft Or, when continuously drilling a horizontal pit from a tilt shaft, after forming vertical walls that can support the main gripper on the inner surface of both sides of the drill wall that is a connecting part between the horizontal shaft and the tilt shaft, the front gripper is used as the drill wall surface. The excavator body is inclined upward or downward while the main gripper is moved up and down along the vertical wall with the front gripper as a fulcrum, and then the main body is tilted upward or downward. Tojakki was contracted is moved to the front of the excavator main body of the main gripper, accordingly Thereafter, the front gripper is contracted with pressure-bonding the main gripper in the vertical wall, the shield excavator body by extending the thrust jacks It is characterized by letting.
[0007]
In the above-described continuous excavation method between the horizontal pit and the inclined pit, the invention according to claim 2 includes a step of inclining the excavator body upward or downward, the main gripper is crimped to the vertical wall, the front gripper is contracted, and the thrust jack The process of extending the excavator body by a certain length by extending the length of the excavator and the process of advancing the main gripper by contracting the thrust jack after the front gripper is pressed and supported on the excavation wall after a certain length of excavation is performed. Thus, a plurality of refracting tunnel portions that are refracted stepwise in the same direction are formed in a continuous portion that connects the horizontal pit and the inclined pit.
[0008]
According to a third aspect of the present invention, in the continuous excavation method between the horizontal pit and the inclined shaft according to the first aspect, the excavator body advances the connecting portion between the horizontal pit and the inclined shaft for a predetermined length, and then the excavator Before the main body is tilted up and down, the thrust jack is contracted to move the main gripper to the front part of the excavator main body.
[0009]
In the invention according to claim 4, the main gripper has a crimping surface to be crimped to the excavation wall surface curved in a convex arc shape with respect to the side surface direction , and the main gripper faces the vertical wall when tilting the excavator body upward or downward. An attachment having a vertical flat surface to be in pressure contact is attached to the pressure-bonding surface of the main gripper.
[0010]
[Action]
When continuously excavating an inclined shaft inclined obliquely upward from a horizontal well using a single tunnel excavator, after excavating the horizontal shaft to the inclined shaft excavation start portion by the tunnel excavator, First, vertical walls that can be pressed and supported by the main gripper are formed on the inner surfaces of both sides of the excavation wall facing the main gripper of the tunnel excavator. By forming the vertical wall, the main gripper can move in the vertical direction and the tunnel length direction. After this vertical wall is formed, the front gripper of the excavator body is crimped to the excavation wall surface of the inclined shaft excavation starting part to support the front part of the excavator body, and the main gripper is contracted to use the front gripper as a fulcrum. By moving the rear side of the main body downward, the entire excavator main body is inclined obliquely upward while moving the main gripper downward along the vertical wall.
[0011]
After that, after the main gripper is crimped to the vertical wall to support the excavator body, the front gripper is released from the excavation wall surface, and when the thrust jack is extended, the excavator body digs upward diagonally and refracts the tunnel. Part is formed. After the formation of the predetermined length of the refraction tunnel portion, by extending the excavator main body so as to extend this refraction tunnel portion, it is possible to form an inclined shaft inclined upward from the end portion of the horizontal well, When excavating a tilt shaft with a large upward inclination angle with respect to a horizontal shaft, the above-mentioned refracting tunnel section is repeatedly excavated several times by the excavator body, and the excavator body is tilted upward in a stepwise manner. Excavate part.
[0012]
That is, after excavating a predetermined length of the refracting tunnel with the main body of the excavator facing upward from the end of the horizontal pit as described above, the front gripper is crimped to the excavation wall surface of the inclined pit excavation starting portion and in front of the excavator main body. The main gripper is then moved obliquely upward along the vertical wall to the front part of the excavator body by releasing the main gripper from the vertical wall and contracting the thrust jack. At this time, if the vertical wall is not provided up to the position where the main gripper is advanced, the vertical wall is appropriately formed in advance so as to be continuous in the tunnel length direction after excavation of the predetermined length of the refraction tunnel portion. Keep it. After that, the rear side of the excavator body is moved downward with the front gripper as a fulcrum, thereby tilting further upward than the tilting posture. The forward movement of the main gripper due to the contraction of the thrust jack may be performed after the excavator body is inclined upward.
[0013]
After the excavator body is inclined further upward in this way, the main gripper is pressed against the vertical wall to support the excavator body, and then the front gripper is released from the excavation wall surface and the thrust jack is extended. Then, the refraction tunnel portion refracted further upward from the refraction tunnel portion is dug for a predetermined length. Then, the digging process of the refracting tunnel portion is repeated, and when the digging tunnel portion excavated last reaches the inclination angle of the planned inclined shaft with respect to the horizontal pit, the excavator main body is dug in a direction extending the refracting tunnel portion to a predetermined length. Excavate the shaft.
[0014]
Next, when continuously excavating a horizontal well from the upper inclined end portion of the inclined shaft, a vertical wall is formed in the same manner as when excavating the inclined shaft from the horizontal shaft to the inner surfaces on both sides of the drilling wall at the upper inclined end portion of the inclined shaft. After that, the excavator body tilted obliquely upward is tilted so as to be in a horizontal state, and the thrust grip is extended with the main gripper being crimped to the vertical wall to support the propulsion reaction force of the excavator body. By doing so, the downward refracting tunnel portion is dug. In this case, when the attitude of the excavator main body cannot be changed in the horizontal direction at once, contrary to the case where the inclined shaft is excavated from the horizontal shaft, a refraction tunnel portion where the refraction angle is gradually reduced is sequentially formed. The excavator body may be changed to a horizontal state, and then the horizontal pit may be excavated.
[0015]
In addition, when excavating a horizontal shaft from the horizontal shaft or a horizontal shaft from the vertical shaft, the entire excavator body is tilted up and down with the front gripper crimped to the drilling wall as a fulcrum. The rear support jack attached to the rear end of the excavator main body at the rear portion of the gripper can be expanded and contracted while being installed on the tunnel excavation wall surface. In addition, since the main gripper has a crimping surface to be crimped to the excavation wall surface curved in a convex arc shape with respect to the side surface direction, an attachment having a flat surface perpendicular to the main gripper is attached and the crimping force with the vertical wall is increased. It is preferable that the propulsion reaction force of the excavator main body be firmly supported by increasing it.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a case where a tunnel excavator C continuously passes through a circular tunnel C having a circular section through an upward refracting tunnel portion B from a horizontal tunnel A having a circular section. It shows the state of excavation and formation. As shown in FIGS. 2 to 4, the tunnel excavator has a disc-shaped partition wall integrally formed at the front end of the excavator main body 1 with a prismatic beam long in the length direction of the tunnel as the excavator main body 1. A cutter head 3 is rotatably supported at the front end of the body 2, and a front gripper 4 that is curved in an arc shape in the tunnel circumferential direction is disposed on the outer periphery of the partition wall 2 so as to be freely expandable and contractable in the tunnel radial direction. Further, a beam receiver 5 is slidably provided in the length direction of the excavator main body 1 at the rear part of the excavator main body 1 made of a beam, and is expanded and contracted in the tunnel radial direction on both sides of the lower surface of the beam receiver 5. Gripper 6, 6 is provided, the beam receiver 5 and the partition wall 2 are connected by a pair of left and right thrust jacks 7, 7, and a rear support jack 8 is mounted downward on the lower surface of the rear end of the excavator body 1 The made Te structure has.
[0017]
Each of the front grippers 4 disposed on the outer peripheral portion 4 of the front end partition wall 2 of the excavator body 1 expands and contracts in the radial direction between the inner peripheral surface and the outer peripheral surface of the partition body 2 by the link mechanism 9 and the jack 10. It is movable and connected so as to be inclined with respect to the tunnel length direction. Further, the beam receiver 5 is formed in a U-shaped cross section as shown in FIG. 3, and the excavator body 1 is slidably supported by the upper surface of the central recess 5a. The main grippers 6 and 6 disposed on both sides of the lower surface of the beam receiver 5 are respectively provided on a cylinder 6a disposed on the lower surface of the beam receiver 5 in the tunnel radial direction and on both inner sides of the cylinder 6a. Pistons 6b and 6b that are slidably provided and slide by fluid pressure, and gripper shoes 6c and 6c that are attached to the rod ends of these pistons 6b and 6b and are curved in an arc shape in the circumferential direction of the tunnel. ing. Further, the main grippers 6 and 6 are connected by jacks 11 and 11 between both side portions of the cylinder 6a and both side portions of the beam receiver 5.
[0018]
In order to excavate the straight tunnel portion of the horizontal pit A or the inclined pit C using the tunnel excavator configured as described above, first, as shown in FIG. 4, the thrust jacks 7 and 7 are contracted to receive the beam. 5 is moved to the front part of the excavator body 1 and the main grippers 6 and 6 that have advanced together with the beam receiver 5 are extended in the outer diameter direction by extending the piston rods in the outer diameter direction as shown in FIG. After the pressure is applied to the inner surface and the excavator body 1 is supported, the front gripper 4 is contracted in the inner diameter direction to release the pressure applied to the excavation wall surface T. When the thrust jacks 7 and 7 are extended while the cutter head 3 is rotated in this state, the main grippers 6 and 6 receive the driving reaction force of the excavator body 1 on the excavation wall surface T and the front gripper 4 is moved to the excavation wall surface. The excavator body 1 moves forward and digs through the tunnel in a state where the rear support jack 8 is in sliding contact with the bottom surface of the excavation wall surface T or slightly lifted while being in sliding contact with T.
[0019]
When the thrust jacks 7 and 7 are fully extended and a tunnel having a predetermined length is excavated, the rear support jack 8 is operated to contact the bottom surface of the excavation wall T to support the rear end portion of the excavator body 1. At the same time, the front gripper 4 is extended and crimped to the excavation wall surface T to support the front end portion of the excavator body 1, and then the main grippers 6 and 6 are contracted to release the crimping to the excavation wall surface T, As described above, the thrust jacks 7 and 7 are contracted to advance the main grippers 6 and 6, and then extended to be crimped to the excavation wall surface T. After that, the front gripper 4 is unbonded to the excavation wall surface T and excavated. Slurry so that the rear support jack 8 is in sliding contact with the bottom surface of the excavation wall surface T or slightly lifted from the bottom surface. Predetermined length excavator body 1 by extending the jacks 7, 7, to excavation.
[0020]
Thus, the main gripper 6, 6 is pressed against the excavation wall T, the excavator body 1 is advanced to advance the tunnel, and the front gripper 4 is pressed against the excavation wall T. 6 and 6 are repeatedly carried out to excavate the horizontal well A and the inclined shaft C. Regarding the method of continuously excavating the inclined shaft C inclined obliquely upward from the horizontal well A with the tunnel excavator. The following is described.
[0021]
First, when the tunnel excavator digs up to the end of the horizontal pit A, that is, to the inclined pit excavation start portion, as shown in FIGS. 3 and 6, main grippers are formed on both inner surfaces of the excavation wall surface T on both sides of the excavator main body 1. Vertical walls 12 and 12 for pressing and receiving 6 and 6 are formed in a predetermined length portion of the excavation wall surface T. The vertical walls 12 and 12 are excavated so that both sides of the excavation wall surface T having a circular cross section are vertical surfaces, or when the excavation wall surface T cannot firmly press the main grippers 6 and 6. Concrete is sprayed onto the wall surface T to form a vertical wall made of concrete. As described above, the inner walls on both sides of the excavation wall surface T to which the main grippers 6 and 6 are pressure-bonded are formed on the vertical walls 12 and 12, thereby providing gripper shoes 6c and 6c that are curved in an arc shape in the circumferential direction of the tunnel. In spite of this, the main grippers 6 and 6 can move along the vertical walls 12 and 12 in the vertical direction and in the oblique direction.
[0022]
After that, the front gripper 4 is pressed against the excavation wall surface T and the rear support jack 8 is brought into contact with the bottom surface of the excavation wall surface T to support the excavator body 1 while the main grippers 6 and 6 are contracted. By contracting the thrust jacks 7 and 7, the main grippers 6 and 6 together with the beam receiver 5 are advanced along the excavator body 1 to the front portion of the excavator body 1.
[0023]
Next, when the rear support jack 8 is contracted from this state, the excavator body 1 tilts downward toward the rear end with the front gripper 4 as a fulcrum due to its own weight, and the whole becomes a horizontal pit A as shown in FIG. On the other hand, it is in a state inclined obliquely upward toward the front. At this time, the main grippers 6 and 6 move downward along the vertical walls 12 and 12. After this state, the main grippers 6 and 6 are extended and pressed against the vertical walls 12 and 12, respectively, to support the propulsion reaction force of the tunnel excavator. After that, when the front gripper 4 is slightly contracted to release the pressure contact with the excavation wall surface T and is brought into sliding contact with the excavation wall surface T, the thrust jacks 7 and 7 are extended while the cutter head 3 is rotated from this state. As shown in FIG. 8, the excavator main body 1 moves obliquely upward toward the front with the above inclination with respect to the horizontal center line of the horizontal pit A, that is, while moving in the length direction of the excavator main body 1. The refracting tunnel portion B1 having a predetermined length corresponding to the extension length of the thrust jacks 7, 7 is formed from the end of the horizontal pit A.
[0024]
When the upward inclination angle of the refracting tunnel portion B1 with respect to the horizontal pit A is equal to the angle of the plan line of the inclined pit C to be subsequently excavated, the tunnel excavator extends from the refracting tunnel portion B1 to the center extension direction of the refracting tunnel portion B1. The inclined shaft C can be formed by excavating the shaft, but if the plan line of the inclined shaft C has a steep slope inclined further upward than the inclination angle of the refractive tunnel portion B1, the above-mentioned refractive tunnel portion B1 After repeating the excavation process, the inclined shaft C is excavated.
[0025]
That is, after excavating the refractive tunnel portion B1 having a predetermined length, when excavating the next refractive tunnel portion B2, the front gripper 4 is pressed against the front end portion of the excavation wall surface T of the refractive tunnel portion B1 and the refractive tunnel portion B1 The excavator body 1 is supported by abutting against the bottom surface of the excavation wall surface T by extending the rear support jack 8 that is separated from the bottom surface of the excavation wall surface T by the advance of the excavator body 1 obliquely upward during excavation. After that, the thrust jacks 7 and 7 are contracted to move the main grippers 6 and 6 together with the beam receiver 5 along the excavator main body 1 to the front of the excavator main body 1 as shown in FIG.
[0026]
Then, when the contract the rear support jacks 8, excavator body 1 is inclined downward toward the rear end of the front-gripper 4 by its own weight as a fulcrum, further than the refractive tunnel portion B1 which is entirely drilled earlier upward It becomes a posture inclined to. In addition, after the excavator body 1 is tilted in this way, the main jacks 6 and 6 may be moved to the front part of the excavator body 1 by contracting the thrust jacks 7 and 7.
[0027]
After this state, the main grippers 6 and 6 are extended and pressed against the vertical walls 12 and 12, respectively, to support the propulsion reaction force of the tunnel excavator. At this time, when the main grippers 6 and 6 moved forward by contracting the thrust jacks 7 and 7 are separated from the front ends of the vertical walls 12 and 12 and reach the excavation wall surface T having a circular cross section, The vertical walls 12 and 12 are further formed in the tunnel extending direction. Thereafter, the front gripper 4 is slightly shrunk so that the crimping of the refracting tunnel portion B1 to the excavation wall surface is brought into sliding contact with the excavation wall surface, and the thrust jacks 7 and 7 are rotated while the cutter head 3 is rotated from this state. By extending the excavator main body 1, the refracting tunnel portion B2 that is continuous with the refracting tunnel portion B1 by the cutter head 3 and is refracted further upward with respect to the refracting tunnel portion B1 is moved forward. Drill (see Fig. 10).
[0028]
In this way, when the refraction tunnel portions B1, B2, B3,... Of a predetermined length that are sequentially inclined upward are continuously excavated, and the inclination angle of the final refraction tunnel portion becomes equal to the inclination angle of the plan line of the inclined shaft C, A tunnel excavator is further excavated from the refraction tunnel portion in the center extending direction of the refraction tunnel portion to form the inclined shaft C. It is to be noted that the bottom of the wall surface is excavated as the inclined shaft C is continuously excavated by the tunnel excavator from the horizontal shaft A through the refractive tunnel portion B which is the refractive connecting portion of the horizontal shaft A and the inclined shaft C. A carriage traveling track 13 for carrying a segment and the like and an excavation shear discharge chute (not shown) are added.
[0029]
Next, when a horizontal pit is continuously excavated from the upper inclined end portion of the inclined shaft C, a connecting portion between the inclined shaft and the horizontal shaft to be excavated may be formed by a refraction tunnel portion inclined downward. That is, after the vertical walls 12 and 12 are formed on both inner surfaces of the excavation wall T at the upper inclined end of the inclined shaft C, the front gripper 4 is bonded to the excavation wall T and the rear support jack 8 is excavated. The excavator body 1 is supported by abutting against the bottom surface of the wall surface T, and the main grippers 6, 6, which are released from the crimping from the excavation wall surface T, are advanced by contraction of the thrust jacks 7, and then the rear By extending the support jack 8, the excavator body 1 is inclined downward with respect to the inclined shaft C by a certain angle with the front gripper 4 as a fulcrum. In addition, after the tilting operation of the excavator body 1, the main jacks 6, 6 may be advanced by contracting the thrust jacks 7, 7.
[0030]
Next, after the main grippers 6 and 6 are extended and crimped to the vertical walls 12 and 12 to support the propulsion reaction force of the tunnel excavator, the front gripper 4 is slightly contracted and crimped to the excavation wall T. And the thrust jacks 7 and 7 are extended while rotating the cutter head 3 while being in sliding contact with the excavation wall surface T, so that a predetermined length inclined downward with respect to the upper inclined end portion of the inclined shaft C is obtained. A refraction tunnel is formed. If the refraction tunnel portion is not horizontal, the excavator body 1 is further tilted downward in the same manner as described above, and then the refraction tunnel portion that has been dug and tilted downward from the refraction tunnel portion is provided. After forming continuously, forming this refraction tunnel part repeatedly and turning it in the horizontal direction, a horizontal pit may be dug. This method can also be used in the case where the inclined shaft refracted obliquely downward from the horizontal shaft is continuously formed.
[0031]
The main grippers 6 and 6 of the excavator main body 1 are surfaces in which gripper shoes 6c and 6c to be pressure-bonded to the excavation wall surface T are curved in a convex arc shape with respect to the side surface direction , that is, in an arc shape in the tunnel circumferential direction. Therefore, there are cases where the pressure bonding area with respect to the vertical walls 12 and 12 is reduced and the supporting force of the tunnel excavator cannot be obtained. In this case, as shown in FIG. 3, an attachment 15 having a flat surface perpendicular to the gripper shoes 6c, 6c of the main grippers 6, 6 is detachably mounted, and the flat surface of the attachment 15 is attached to the vertical wall 12, The entire surface should be crimped to 12.
[0032]
【The invention's effect】
As described above, according to the continuous excavation method between the horizontal pit and the inclined pit according to the present invention, the main gripper disposed at the rear portion of the excavator body is crimped and supported on the excavation wall surface and disposed at the front portion. When excavating a horizontal shaft from a horizontal shaft or a horizontal shaft from a horizontal shaft using a tunnel excavator configured to extend a tunnel by extending a thrust jack with the front gripper unbonded from the drilling wall In addition, a vertical wall that can support the main gripper is formed on the inner surfaces of both sides of the excavation wall surface, which is a connecting part between the horizontal pit and the inclined pit, so that the main gripper can be freely moved in the vertical and longitudinal directions along the vertical wall. Therefore, the rear side of the excavator body equipped with the main gripper can be reliably and smoothly moved in the vertical direction with the front gripper pressed against and supported by the excavation wall surface. The excavator body can be dynamic predetermined angle may be in a state of being inclined upwardly or downwardly attitude. Further, the main gripper can be firmly pressure-bonded to the vertical wall, and the excavator body can be continuously excavated from the horizontal shaft or the horizontal shaft from the horizontal shaft while maintaining the predetermined angle.
[0033]
Further, according to the invention of claim 2, the excavator is provided by the step of tilting the excavator body upward or downward, the main gripper is crimped to the vertical wall, the front gripper is contracted, and the thrust jack is extended. By repeating the process of digging the main body for a certain length and the process of pressing and supporting the front gripper against the digging wall after the digging for a certain length and then contracting the thrust jack and moving the main gripper forward, the horizontal and tilt shafts Since a plurality of refracting tunnel parts refracting in the same direction in stages are formed in a continuous part that is continuous, it is possible to excavate a curved tunnel part that inclines sharply upward from a horizontal pit, with a large degree of inclination. Even if it has an inclined shaft, it can be excavated continuously and accurately from a horizontal shaft.
[0034]
Furthermore, in the continuous excavation method between the horizontal pit and the inclined pit, according to the invention according to claim 4, the attachment having a vertical flat surface is attached to the crimping surface of the main gripper to be crimped to the vertical wall. The pressure-bonding force becomes strong, and it is possible to dig while reliably supporting the propulsion reaction force of the excavator body.
[Brief description of the drawings]
FIG. 1 is a simplified longitudinal side view of a state where a tilt shaft is continuously excavated from a horizontal shaft.
FIG. 2 is a simplified perspective view of a tunnel excavator.
FIG. 3 is a longitudinal front view of a state in which a main gripper is crimped to a vertical wall.
FIG. 4 is a simplified side view of a tunnel excavator.
FIG. 5 is a longitudinal front view of a state in which a main gripper is crimped to an excavation wall surface.
FIG. 6 is a simplified side view showing a state before the start of excavation of the refraction tunnel portion.
FIG. 7 is a simplified side view of a state where the tunnel excavator is inclined obliquely upward.
FIG. 8 is a simplified side view during excavation of the excavation tunnel.
FIG. 9 is a simplified side view of the excavation tunnel portion inclined further upward before the start of excavation.
FIG. 10 is a simplified side view showing excavation of an excavation tunnel portion that is sequentially inclined upward.
FIG. 11 is a simplified longitudinal sectional side view showing a conventional example.
FIG. 12 is a simplified plan view thereof.
[Explanation of symbols]
A horizontal pit B refraction tunnel C tilt pit T excavation wall 1 excavator body 3 cutter head 4 front gripper 5 beam receiver 6 main gripper 7 thrust jack 8 rear support jack
12 Vertical wall
15 Attachment

Claims (4)

By extending the thrust jack with the main gripper arranged at the rear of the excavator body pressed against and supported by the excavation wall and the front gripper arranged at the front being released from the excavation wall When continuously excavating a horizontal shaft from a horizontal shaft or a horizontal shaft from a horizontal shaft using a tunnel excavator configured to excavate a tunnel, the inner surface on both sides of the excavation wall that is a continuous connection portion between the horizontal shaft and the vertical shaft After forming the vertical wall that can support the main gripper, press and support the front gripper on the excavation wall surface, and move the main gripper up and down along the vertical wall with the front gripper as a fulcrum. Or tilt down and then contract the thrust jacks to move the main gripper to the front of the excavator body, after which the main Ripper front gripper is contracted with to crimp the vertical wall, the continuous drilling process between the horizontal mine and inclined shaft, characterized in that for boring the excavator body by extending the thrust jack. A step of tilting the excavator body upward or downward, a step of pressing the main gripper against the vertical wall, contracting the front gripper, and extending the thrust jack to extend the excavator body for a fixed length; After that, the front gripper is crimped to and supported by the excavation wall surface, and then the thrust jack is contracted and the main gripper is advanced repeatedly to repeat the horizontal grip and the inclined shaft in the same direction step by step. 2. The continuous excavation method between a horizontal shaft and a tilt shaft according to claim 1, wherein a plurality of refracted tunnel portions are refracted.   After excavating the connecting part between the horizontal pit and the inclined pit for a certain length by the excavator body, the thrust jack is contracted before moving the excavator body in the vertical direction and the main gripper is moved to the front of the excavator body. The continuous excavation method between a horizontal shaft and a tilt shaft according to claim 1. The main gripper has a crimping surface that is crimped to the excavation wall surface curved in a convex arc shape with respect to the side surface direction, and has a vertical flat surface that is in pressure contact with the vertical wall when the excavator body is tilted upward or downward. 4. A continuous excavation method between a horizontal shaft and a tilt shaft according to claim 1, wherein the attachment is attached to a pressure contact surface of the main gripper.

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