JP4926007B2 - Excavation equipment for tunnel expansion - Google Patents

Description

  The present invention relates to a tunnel expansion excavation equipment equipped with a rail device having a rail member for guiding a mobile body in a tunnel, and equipped with an excavator for expanding and excavating a natural ground on the outer periphery side of the tunnel from the tunnel to the mobile body. In particular, when forming tunnel construction parts such as large-diameter road branches and junctions, several roof shield tunnels are excavated on the outer periphery of the tunnel construction part, and adjacent roof shield tunnels are connected to form a tunnel construction part. A tunnel construction method that protects the face is proposed. For example, this tunnel construction method is suitable for extended excavation from inside a roof shield tunnel.

As an excavator for expanding and excavating a natural ground in front of the tunnel from inside the tunnel, for example, Patent Document 1 discloses an apparatus provided with a gripper device that fixes a reaming device in a state of being stretched every 90 ° on the inner surface of the tunnel.
JP-A-8-114083 (FIG. 3)

  By the way, in JP-A-2006-70530, when excavating a large-diameter tunnel construction part such as a road branch or a junction, a roof shield tunnel is expanded and excavated at a predetermined interval on the outer peripheral part of the tunnel construction part, and from inside the roof shield tunnel. A tunnel construction method has been proposed in which natural ground between adjacent roof shield tunnels is excavated, roof shield receiving works (connection structures) are installed in these excavated parts, and the tunnel construction part is face protected.

  When carrying out this tunnel construction method, the excavator is moved along the roof shield tunnel in the axial direction of the tunnel, and extended excavation is performed toward the adjacent roof shield tunnel. In this tunnel construction method, each excavator will excavate every 360 degrees around the tunnel axis corresponding to the adjacent roof shield tunnel for each roof shield tunnel. It is necessary to move forward stably in the direction of the tunnel axis while maintaining a constant posture corresponding to the above.

  As a countermeasure, the above problem can be solved by laying guide rails in the tunnel. However, since the moving body receives the excavation reaction force of the excavator, the guide rail is required to have high mechanical strength and laying strength, and the guide rail and the laying member are enlarged, so that time and cost for laying and removing work are increased. There was a problem that it took.

  The present invention solves the above-mentioned problems, makes it possible to reduce the size of the rail device for guiding the moving body, laying and removing it easily and in a short time, and moving the moving body back and forth stably in a fixed posture. It aims to provide excavation equipment for tunnel expansion.

  The excavation facility for tunnel expansion according to claim 1 is provided with a rail device having a rail member that guides the moving body in the axial direction of the tunnel on the inner wall of the tunnel. Excavator capable of expanding excavation, a plurality of gripper devices capable of supporting the excavation reaction force of the excavator by fixing the moving body by pressing the pressing member against the inner wall of the tunnel, and a guide portion guided by the rail member of the rail device And a propulsion device that advances the moving body along the rail member. The guide device is separated from the rail member during excavation, and the excavation reaction force is passed through the gripper device. A guide release mechanism that is supported on the inner wall of the tunnel is provided.

  According to a second aspect of the present invention, there is provided a tunnel expansion excavation facility according to the first aspect, wherein the rail device includes a rail member formed in a predetermined length, and a plurality of rail members that are detachably disposed at predetermined intervals on the inner wall of the tunnel. The rail bracket includes an engaging portion in which the rail member is arranged to be movable in the length direction, and a detachable tool that can fix and release the rail member to and from the engaging portion. is there.

  According to a third aspect of the present invention, there is provided a tunnel expansion excavation facility according to the first or second aspect in which at least a pair of rail devices are arranged at symmetrical positions of the tunnel axis on the inner wall of the tunnel.

  According to a fourth aspect of the present invention, there is provided the excavation facility for tunnel expansion according to any one of the first to third aspects, wherein the propulsion device includes a movable frame that is movable in and out of the movable body in the tunnel axis direction, and the movable frame. And a locking device that is detachably attached to the inner wall of the tunnel, and the movable body is moved closer to the movable frame that is locked to the inner wall of the tunnel by the locking device when the movable body is released by the gripper device. The movable body fixed by the gripper device moves the movable frame separated from the inner wall of the tunnel away from the movable body, and this is repeated to propel the movable body along the rail member. It is configured.

  According to the first aspect of the present invention, during excavation, the guide portion is released from the rail member by the guide portion release mechanism of the guide device, and the excavation reaction force by the excavator is supported on the inner wall of the tunnel via the gripper device. Therefore, the excavation reaction force is not transmitted to the rail device. Therefore, the rail member only needs to support its own weight such as a moving body or an excavator when moving forward, the rail member and the laying member can be reduced in size and weight, and the rail member can be laid and removed easily and quickly. Can be done. The propulsion device can stably move the moving body along the rail member in a constant posture.

  According to the second aspect of the present invention, the rail device is provided with the rail member having a predetermined length, and the rail bracket which is detachably attached to the inner wall of the tunnel and which can be fixed and released to the engaging portion by the attachment / detachment tool. Each time one or more excavations, the moving body is advanced, the rail bracket and the rail member are separated from the inner wall, the rail member is sent in the length direction, and the rail bracket is moved to move the rail member to the inner wall. The rail device can be reduced in size and weight. Since the rail bracket is provided with the engaging portion, the rail member can be easily moved along the length direction.

  According to the invention described in claim 3, by arranging the rail member at a symmetrical position of the tunnel axis, even if the movable body is oriented to an arbitrary angle around the tunnel axis, the movable body can be stabilized. It can be moved forward and backward.

  According to the fourth aspect of the present invention, since the movable body having the locking device and the moving body are moved closer to and away from each other by the propulsion device, the moving body is propelled along the rail member. Can be moved forward and backward stably.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
(Overall structure)
As shown in FIG. 1 to FIG. 3, a tunnel expansion excavation facility according to the present invention includes an expansion excavator 10 that excavates a natural ground on the outer peripheral side of a tunnel T, and an inner wall TS of the tunnel T. It comprises a rail device 5 in which rail members 51 are laid at symmetrical positions (the vertical position in the figure), and the expansion excavator 10 tunnels the mobile platform 2 that is a moving body on which the excavator 1 is mounted, and the mobile platform 2 A plurality of gripper devices 3 that can be fixed and released on the inner wall TS of T, and a movable frame 15 arranged at the front part (or the rear part) of the movable frame 2 are moved closer to and away from the movable frame 2 to tunnel the movable frame 2 A self-propelled propulsion device 4 that moves back and forth along the direction of the axis O, and guide devices 6M, 6F, and 6R that guide the movable frame 2 in the direction of the tunnel axis O via a rail member 51 are provided. .

  The inner wall TS of the tunnel T is covered with a plurality of segments S assembled in the circumferential direction and the tunnel axis O direction. The segment S includes an arc-shaped outer peripheral plate Sa, a pair of flange plates Sd attached to inner surfaces of two sides along the circumferential direction of the outer peripheral plate Sa, and two sides along the tunnel axis O direction of the outer peripheral plate Sa. A pair of connecting plates Sc each attached to the inner surface, and a plurality of rib plates Sb attached along the tunnel axis O direction between the flange plates Sd on the inner surface of the outer peripheral plate Sa.

(Moving platform)
The movable gantry 2 includes a pair of left and right front / rear beams 11 arranged in the front / rear direction at predetermined intervals in the left / right direction and the up / down direction, and a pair of left / right pairs that connect both ends of the upper and lower front / rear beams 11 to each other. Are formed in a rectangular parallelepiped frame structure with two pairs of longitudinally connected beams 12 in the front and rear and two pairs of horizontally connected beams 13 in the upper and lower pairs that connect both ends of the left and right front and rear beams 11 to each other. Excavator 1 is mounted on the bottom between 11 and laterally connected beam 13.

(Excavator)
The excavator 1 is installed so as to excavate a natural ground in the left direction toward the front of the tunnel T, for example. As shown in FIGS. 4 and 5, the excavator 1 is provided with a longitudinal base frame via a longitudinal roller 23 a on a pair of longitudinal rails 21 laid along the front and rear beams 11 on the bottom of the movable frame 2. 23 is movably supported, and the longitudinal base frame 23 is reciprocated within a predetermined range in the direction of the tunnel axis O by a plurality of longitudinal jacks 22. On this longitudinal base frame 23, a pair of front and rear inclined slide rails 24 inclined from the upper left side to the lower right side are laid, and the slide base 26 is movably supported by the inclined slide rail 24 via a slide roller 26a. The slide base 26 is moved in and out by a slide jack 25 within a predetermined range in the left-right direction.

  On the slide base 26, a fixed end portion of the swing frame 27 is supported by the slide base 26 so as to be swingable around an axis parallel to the tunnel axis O. A circumferential swing frame 28 is supported at the free end so as to be swingable about an axis parallel to the tunnel axis O. Then, between the right side portion of the slide base 26 and the intermediate portion of the retracting and swinging frame 27, the retracting and swinging frame 27 is swung in the left and right directions around the fixed end portion so that the circumferential swing frame 28 is projected. An exit / retreat swing jack 29 to be retracted is connected. Further, between the left side portion of the slide base 26 and the circumferential swing frame 28, a circumferential swing jack 30 for swinging the circumferential swing frame 28 in the vertical direction is connected.

  Here, the distance between the connecting portions of the slide-out swing frame 27 and the circumferential swing jack 30 in the slide base 26, and the slide-out swing frame 27 and the circumferential swing jack 30 in the circumferential swing frame 28 are By setting the length of the circumferential swing jack 30 equal to the retracting swing frame 27, a parallel link can be formed. Therefore, the circumferential swing frame 28 can be translated (retracted) in the left-right direction in a constant posture by driving the retractable swing jack 29 to extend and contract in a state where the parallel link is formed.

  A retractable beam 33 that is retracted by a head retracting jack 32 is slidably fitted to a retractable guide cylinder 31 installed on the circumferential swing frame 28. Further, an excavation head 35 is provided at the tip of the exit / retreat beam 33 so as to be rotationally driven around an axis in the exit / retreat direction by the cutter rotation driving device 36. The excavation head 35 is orthogonal to the exit / retreat direction and the tunnel axis O. A head swing jack 34 that swings within a predetermined range around an axis center is provided.

  Accordingly, the excavating head 35 is moved out and out by the slide jack 25, the swinging jack 29, and the head retracting jack 32, and the drilling head is driven by the longitudinal jack 22, the circumferential swing jack 30, and the head swinging jack 34. It is possible to excavate the excavation part shown in FIG.

(Gripper device)
On the left and right sides of the four laterally connected beams 13 in the movable frame 2, gripper devices 3 are provided that can freely fix and release the movable frame 2 to the inner wall TS of the tunnel T. As shown in FIG. 6, the gripper device 3 includes an outer cylindrical portion 3a attached to the laterally connected beam 13 in the radial direction centered on the tunnel axis O, and is fitted in the outer cylindrical portion 3a so as to be freely retractable. The joined inner cylinder part 3c, the gripper jack 3b provided in the outer cylinder part 3a to drive the inner cylinder part 3c, and the pin 3d parallel to the tunnel axis O at the tip of the inner cylinder part 3c Via a pressure frame 3e supported so as to allow swinging within a predetermined range, and with a urethane rubber provided on the pressure frame 3e and pressed against the inner wall TS (to the inner end of the rib plate Sb) It comprises a plurality of pressing blocks (pressing members) 3f.

(Propulsion device)
As shown in FIGS. 1 and 3, the propulsion device 4 is provided with a movable frame 15 that can be moved forward and backward from the movable frame 2 along the tunnel axis O, and a tunnel provided at the tip of the movable frame 15. And a locking device 16 that can be freely engaged with and disengaged from the inner wall TS of T. In a state where the locking device 16 is locked to the inner wall TS of the tunnel T, the gripper device 3 is released and moved relative to the movable frame 15. The gantry 2 can be driven closer to move the moving gantry 2 forward in the tunnel axis O direction.

  In other words, the movable frame 15 is formed in a cross-beam shape between the inner cylindrical beam 15a that is fitted to the front and rear beams 11 of the movable gantry 2 so as to be able to move forward and backward, and the left and right inner cylindrical beams 15a. A pair of upper and lower horizontal beams 15b and a pair of left and right vertical beams 15c connected to each other, and a propulsion jack 17 that drives the movable frame 15 through the inner cylindrical beam 15a is disposed in each of the front and rear beams 11. Has been. The locking device 16 is provided at each of the upper end and the lower end of each vertical beam 15c, and as shown in FIG. 7, a retractable cylinder 16a fitted in the vertical beam 15c so as to be freely retractable. And a locking jack 16b for driving the extending and retracting cylinders 16a respectively, and a pair of front and rear locking claws that are provided at the front end of the extending and retracting cylinder 16a and can be engaged with the front and rear of the flange plate Sd of the inner wall TS. 16c. Therefore, the movable frame 15 can be locked to the inner wall TS by projecting the retractable cylinder 16a by the locking jack 16b and engaging the locking claws 16c in front of and behind the flange plate Sd.

  Further, a cutter driving pump unit 41 is provided above the vertical beam 15c of the movable frame 15, and a jack driving hydraulic unit 42 is provided below. Further, a control panel 44 and an oil tank 45 are provided at an intermediate portion of the vertical beam 15c via a posture adjusting device 43 having a flange ring that can be changed to an upright posture around an axis parallel to the tunnel axis O. ing.

(Rail device)
As shown in FIGS. 8 and 10, the rail device 5 includes a plurality of rail brackets 52 </ b> A to 52 </ b> A that are detachably attached to a rail member 51 having a predetermined length and a predetermined flange plate Sd of the inner wall TS of the tunnel T. 52D. The rail brackets 52 </ b> A to 52 </ b> D are formed with guide recesses (engaging portions) 53 that guide the rail member 51 to be movable in the length direction. Further, a pair of rail members 51 are arranged at the upper and lower positions that are symmetrical positions of the tunnel axis O, for example. Of course, a plurality of pairs can be arranged at symmetrical positions of the tunnel axis O.

  As shown in FIG. 10, the rail member 51 has a rectangular tube shape and is attached with a pulling bracket 51a at the front end portion and the rear end portion, and as shown in FIG. 1, the retracting stroke LB of the locking device 16 of the movable frame 15 is provided. And the total length of the movable gantry 2 and the installation stroke LA before and after the gripper device 3 are at least a predetermined distance longer. Each of the rail brackets 52A to 52D includes a bracket plate 52a formed in a frontal portal shape having a recess, and mounting bolts 55 which are mounting tools mounted on both ends of the bracket plate 52a through bolt holes, respectively. The rail brackets 52 </ b> A to 52 </ b> D are detachably attached to the flange plate Sd of the inner wall TS by mounting bolts 55. A U-shaped guide bracket 56 that forms a guide recess 53 is attached to the recess of the bracket plate 52a. The guide bracket 56 has a guide surface that can be slidably contacted with the left and right side surfaces and the inner side surface of the rail member 51, and the guide recess 53 guides the rail member 51 in the length direction along these guide surfaces. be able to. In addition, a detachable bolt 54 that is a detachable tool capable of fixing the rail member 51 is mounted on the inner surface of the guide bracket 56 through a bolt hole.

(Guide device)
9 and 10, the guide devices 6M, 6F, 6R are movable with the front and rear guide devices 6F, 6R arranged at the center of the upper and lower laterally connected beams 13 at the front and rear of the movable mount 2, respectively. The movable guide device 6M is disposed at the center of the upper and lower horizontal beams 15b of the frame 15. The front and rear guide devices 6F and 6R and the movable guide device 6M are in contact with the three surfaces of the movable rail member 51, respectively. Alternatively, the guide portions 62A, 62B, and 62C are arranged to face each other with a predetermined gap. In addition, a guide part release mechanism 61 is provided that is movable between a guide position where the two guide parts 62A and 62B face the rail member 51 and a release position where the two guide parts 62A and 62B are separated from the rail member 51.

  That is, the guide part release mechanism 61 is a fixed arm 65 having a guide part 62C with a sliding plate that stands on the lateral connection beam 13 and the horizontal beam 15b and faces the right side surface (opposite to the excavation direction) of the rail member 51. And a sliding plate that is slidably supported by a middle portion of the fixed arm 65 via a support pin 63a parallel to the tunnel axis O, and that slides and faces the left side surface and the inner side surface of the rail member 51, respectively. An L-shaped opening / closing arm 63 having guide portions 62A and 62B, and a guide portion release jack 64 connected to the protruding portion 63b of the opening / closing arm 63 to drive the opening / closing arm 63 between a guide position and a release position. Has been. The guide portion release jack 64 is supported by the laterally connected beam 13 or the horizontal beam 15b through a support pin so as to be swingable. The guide portion release jack 64 has a guide position indicated by a solid line in FIG. The guide portions 62A and 62B can be swung between release positions indicated by virtual lines.

  In FIG. 9B, the guide portion 62A abuts on the rail member 51 at the guide position, and the guide portions 62B and 62C face each other with a predetermined gap from the rail member 51. This is to absorb the displacement error of the rail member 51 due to the assembly error of the segment S.

  In the guide devices 6M, 6F, and 6R, the rail device 5 is moved from the guide devices 6M, 6F, and 6R to the guide device 6M, 6F, and 6R by setting the guide device 6M, 6F, and 6R to the guide position when the movable frame 2 is moved backward. The movable frame 2 is guided to the rail member 51 by the guide portions 62A, 62B, and 62C and is moved forward. Further, during excavation by the excavator 1, the guide portions 62 </ b> A and 62 </ b> B are moved away from the rail member 51 by the guide portion release jack 64, so that all of the excavation reaction force is tunneled from the movable gantry 2 through the gripper device 3. It is transmitted to and supported by the inner wall TS. Thereby, the excavation reaction force is prevented from being transmitted to the rail member 51, and the rail member 51 and the rail brackets 52A to 52D can be reduced in size and weight.

(Drilling operation)
The tunnel construction method using the above-mentioned expansion excavation equipment will be described.
First, as shown in FIG. 12, in the tunnel construction part A, a small-diameter shield machine is started from one of the main tunnel a1 and the branch tunnel a2, and a plurality of tunnels T are arranged in parallel so as to surround the tunnel construction part A. The inner wall TS is formed in the tunnel T by excavating. Further, a reinforcing beam B is installed in the inner wall TS at a position facing the adjacent tunnel T, and a rail member 51 is installed via a rail bracket 52 at a symmetrical position of the tunnel axis O at the inner wall TS between the reinforcing beams B. To do.

  When the expansion excavator 10 is mounted on the rail member 51 and disposed at the excavation position, the gripper jack 3b of the gripper device 3 is advanced to press the pressing block 3f against the inner wall TS, and the movable platform 2 is fixed to the inner wall TS. . Furthermore, the guide part release jack 64 of the guide part release mechanism 61 is contracted to open the open / close arm 63, and the guide parts 62A and 62B are set to the release positions. Then, the ground on the tunnel T side to be excavated is treated with chemicals, and a part of the inner wall TS is removed to open the excavation opening.

  In this tunnel construction method, the excavation reaction force is supported by the inner wall TS facing the excavation direction in order to form the excavation opening (for excavation on the opposite side) in the substantially symmetrical position of the excavation opening formed in the inner wall TS. Can not do it. For this reason, in the present invention, the excavation reaction force is supported by the inner wall TS in a direction different from the excavation direction by approximately 90 °, and the support force by the gripper device 3 is made sufficiently large.

  In the excavator 1, the length of the circumferential rocking jack 30 is the same as that of the rocking frame 27, and a parallel link is formed. The excavating head 35 is rotationally driven to extend the rocking jack 29. 35 is projected from the excavation opening of the inner wall TS, and the natural ground is expanded and excavated.

  The excavation head 35 is oscillated by expanding and contracting the circumferential swing jack 30 to expand the excavation part in the circumferential direction. Further, the longitudinal jack 22, the slide jack 25, the head retracting jack 32 and the head swing jack 34 are provided. The excavation part is expanded by moving the excavation head 35 by expanding and contracting.

  Further, when the excavation part is expanded as shown in FIG. 13, excavation is similarly performed from the adjacent tunnel T, an excavation part communicating between the adjacent tunnels T is formed, and a stiffening frame M is assembled to the excavation part, Further, a reinforced concrete C is cast to form a connection structure, and a roof shield tip R is constructed.

(Forward movement)
A forward operation in which the propulsion device 4 advances the expansion excavator 10 to the next excavation position will be described.

  Here, as shown in FIGS. 1 and 10, the rail device 5 is configured such that the length of the segment S in the direction of the tunnel axis O, that is, the interval between the flange plates Sd is 1 P, and the front and rear gripper devices 3 on the movable frame 2. The installation stroke LA is formed within 3 P, for example, and the retracting stroke LB of the locking device 17 by the movable frame 15 is applied to the flange plate Sd of the at least second segment S from the stop position in front of the movable frame 2. It is set to 1P or more to reach.

  The upper and lower rail members 51 are attached to the inner wall TS by four first to fourth rail brackets 52A to 52D, for example, as shown in FIG. The inner wall TS is formed by connecting a ring SR formed by connecting a plurality of segments S in the circumferential direction in the direction of the tunnel axis O, and the ring SR adjacent to the front and the rear is composed of the front and rear segments S. Are connected by a ring connecting portion RC in which the flange plates Sd are joined together. Here, in order to explain the operation, as shown in FIG. 11, the plurality of rings SR forming the inner wall TS on which the rail member 51 is installed are defined as first to eighth rings SR1 to SR8 from the rear to the front. 1st-8th ring SR1-SR8 shall be connected by the 1st-7th ring connection part RC1-RC7.

1. In the initial position, first to fourth rail brackets 52A to 52D are attached to the first, third, fourth, and sixth ring connecting portions RC1, RC3, RC4, and RC6, respectively, and these first to fourth rail brackets 52A are attached. The rail member 51 is supported by ˜52D. The rear guide device 6R is engaged with the rail member 51 at a position corresponding to the second ring SR2, the front guide device 6F is engaged with the rail member 51 at a position corresponding to the fourth ring SR4, and the movable guide device 6M is The 5-ring SR5 is engaged with the rail member 51 at a corresponding position. [FIG. 11 (a)]
In this initial position, excavation is performed in a state where the movable frame 2 is fixed to the inner wall TS by the gripper device 3 and each guide device 6R, 6F, 6M is set to the release position by the guide portion release mechanism 61. When excavation is completed, in each of the guide devices 6R, 6F, and 6M, the guide portions 62A and 62B are set to the guide positions that face or contact the rail member 51 by the guide portion release mechanism 61. Then, the gripper device 3 is released, and the own weights of the movable platform 2 and the excavator 1 are supported on the inner wall TS of the tunnel T via the guide devices 6M, 6F, 6R and the rail device 5, and each propulsion jack 17 is further supported. Shrink and advance the movable mount 2 by 1P.

2. After the locking jack 16b of the locking device 16 is contracted to disengage the locking claw 16c from the fourth ring connection portion RC4, each propulsion jack 17 is advanced to move the movable frame 15 forward by 1P and move. The guide device 6M is disposed at a position corresponding to the fifth ring SR5 to the sixth ring SR6. Then, after the movable gantry 2 is fixed to the inner wall TS by the gripper device 3, the third rail bracket 52C is detached from the fourth ring connection portion RC4 and attached to the fifth ring connection portion RC5. Further, the locking jack 16b of the locking device 16 is advanced to engage the locking claw 16c with the fifth ring connecting portion RC5. [FIG. 11 (b)]
3. The fourth rail bracket 52D is detached from the sixth ring connection portion RC6 and attached to the seventh ring connection portion RC7. Further, after the mounting bolts 55 of the first to fourth rail brackets 52A to 52D are removed and the rail member 51 is separated from the inner wall TS, a manual operation or an electric or manual winch or jack (not shown) is performed by an operator. In use, the rail member 51 is advanced by 1P along the tunnel axis O direction. [FIG. 11 (c)]
4). The rail member 51 is fixed to the third rail bracket 52C and the fourth rail bracket 52D by the mounting bolt 55. [FIG. 11 (d)]
5. The first rail bracket 52A is detached from the first ring connecting portion RC1 and attached to the second ring connecting portion RC2, and the second rail bracket 52B is detached from the third ring connecting portion RC3 and attached to the fourth ring connecting portion RC4. The rail member 51 is fixed to the first rail bracket 52A and the second rail bracket 52B by the mounting bolt 55. And after making guide part 62A, 62B into the release position spaced apart from the rail member 51 by the guide part release mechanism 61, the next excavation is started. [FIG. 11 (e)]
Here, in FIG. 11C, the rail member 51 is moved forward by 1P by the worker, but the rail member 51 can be clamped by the guide device 6M of the movable frame 15, or separately clamped on the movable frame 15. By providing the device and making the movable frame 15 and the rail member 51 clampable, the rail member 51 can be automatically advanced when the movable frame 15 protrudes.

In addition, FIG.12 (b) has shown the extended excavation state for connecting the tunnel T adjacent to an up-down direction.
(Effect of Embodiment 1)
According to the above-described embodiment, the guide devices 6R, 6F, and 6M are provided with the release position where the guide portions 62A and 62B are separated from the rail member 51 via the open / close arm 63 by the guide portion release jack 64, and the guide portions 62A and 62B. Since the guide portion release mechanism 61 that opens and closes between the rail member 51 and the guide position that contacts or abuts the rail member 51 is provided, the excavation reaction force by the excavator 1 is not transmitted to the rail member 51 during excavation. Can be supported on the inner wall TS of the tunnel T via the gripper device 3. Therefore, the rail device 5 only needs to support its own weights such as the movable gantry 2 and the excavator 1, and the rail member 51 and the rail brackets 52A to 52D can be reduced in size and weight. Removal can be performed easily and in a short time. Further, the propulsion device 4 can stably move the movable base 2 through the rail member 51 in a fixed posture.

  Further, the rail device 5 is provided with a rail member 51 having a predetermined length and rail brackets 52A to 52D having detachable bolts 54 that are detachably attached to the inner wall TS of the tunnel T and that can freely fix and release the rail member 51 to the guide recess 53. Therefore, along with the movement of the movable frame 2, the rail brackets 52A to 52D and the rail member 51 can be moved forward by forward feeding, and the rail member 51 and the rail brackets 52A to 52D can be further reduced in size and weight. . In addition, since the rail member 51 can be moved forward in the length direction via the guide recesses 53 of the rail brackets 52A to 52D, the laying operation and the removal operation of the rail member 51 can be easily performed.

  Furthermore, by arranging the rail member 51 at a symmetrical position with respect to the tunnel axis O, the movable mount 2 can be stably held and advanced even when the movable frame 2 is in an attitude of any angle around the tunnel axis O. It is possible to stably excavate natural ground in all directions on the outer peripheral portion of the tunnel T.

  Furthermore, the propulsion device 4 is configured such that the movable frame 15 having the locking device 16 is moved back and forth in the direction of the tunnel axis O from the movable frame 2 so that the movable frame 2 moves forward along the rail member 51. The movable mount 2 can be moved forward stably.

  In addition, although operation | movement of only the advance was demonstrated for the propulsion apparatus 4, reverse can also be performed. Further, the propulsion device 4 has the movable frame 15 disposed at the front portion of the movable gantry 2, but the movable frame 15 may be disposed at the rear portion of the movable gantry 2.

1 is an overall side view showing Embodiment 1 of a tunnel expansion excavation facility according to the present invention. It is a front view of the excavation equipment for tunnel expansion. It is a rear view of the excavation equipment for tunnel expansion. It is a side view of a drilling apparatus. It is a front view of a drilling apparatus. A gripper apparatus is shown, (a) is a front view, (b) is a side view. It is a side surface fragmentary sectional view which shows a locking device. A rail bracket is shown, (a) is a front view, (b) is a side fragmentary sectional view. A guide apparatus is shown, (a) is a side fragmentary sectional view, (b) is a front view. It is a half longitudinal cross-sectional view which shows arrangement | positioning of a guide apparatus. (A)-(e) is a fragmentary longitudinal cross-sectional view explaining each advance operation | movement. It is explanatory drawing of the extended excavation part of a tunnel, (a) is a whole cross-sectional view, (b) is the C section enlarged view shown to (a). The expanded excavation state of the tunnel is shown, (a) is an enlarged view showing the excavation state of D part shown in FIG. 12 (a), (b) is an enlarged view showing the excavation state of E part shown in FIG. 12 (a). is there.

Explanation of symbols

T Tunnel O Tunnel axis TS Inner wall S Segment 1 Excavator 2 Moving platform (moving body)
DESCRIPTION OF SYMBOLS 3 Gripper apparatus 4 Propulsion apparatus 5 Rail apparatus 6M, 6F, 6R Guide apparatus 10 Expansion excavator 11 Front and rear beam 12 Vertical connection beam 13 Horizontal connection beam 14 Bottom frame 15 Movable frame 16 Locking device 17 Propulsion jack 35 Excavation head 51 Rail Member 52A-52D Rail bracket 53 Guide recessed part (engagement part)
54 Removable bolt (detachable tool)
55 Mounting bolt (mounting tool)
61 Guide part release mechanism 62A, 62B Guide part 62C Guide part 63 Opening / closing arm 64 Guide part release jack 65 Fixed arm

Claims (4)

A rail device having a rail member for guiding a moving body in the tunnel axial direction is provided on the inner wall of the tunnel,
An excavator capable of expanding excavation from the tunnel to the outer periphery of the tunnel from inside the tunnel, and a plurality of gripper devices capable of supporting the excavation reaction force of the excavator by pressing the pressing member against the inner wall of the tunnel And a guide device having a guide portion guided by the rail member of the rail device, and a propulsion device that advances the moving body along the rail member,
Excavation equipment for tunnel expansion characterized in that the guide device is provided with a guide portion release mechanism that separates the guide portion from the rail member during excavation and supports the excavation reaction force on the inner wall of the tunnel via the gripper device. . The rail device includes a rail member formed to a predetermined length, and a plurality of rail brackets that are detachably disposed at predetermined intervals on the inner wall of the tunnel,
The rail bracket includes an engaging portion in which a rail member is movably disposed in a length direction, and a detachable tool capable of fixing and releasing the rail member to and from the engaging portion. Excavation equipment for tunnel expansion. The excavation equipment for tunnel expansion according to claim 1 or 2, wherein at least a pair of rail devices are arranged on the inner wall of the tunnel at symmetrical positions of the axis of the tunnel. The propulsion device has a movable frame that can be moved back and forth in the direction of the tunnel axis from the moving body, and a locking device that is provided on the movable frame and is detachable from the inner wall of the tunnel.
When the moving body is released by the gripper device, the moving body is moved closer to the movable frame locked to the inner wall of the tunnel by the locking device. When the moving body is fixed by the gripper device, the locking device is The movable frame detached from the inner wall is moved away from the moving body, and this is repeated to propel the moving body along the rail member. Excavation equipment for tunnel expansion.

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