JP2012026209A - Lining-switchable type tunnel excavator and lining switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining-switchable type tunnel excavator capable of easily switching a lining by a direct placing concrete and a lining by a segment if necessary in a short period and also capable of shortening the machine length of an excavator body.SOLUTION: In a lining-switchable type mud-pressure type shield excavator 10 capable of excavating a tunnel by switching lining by a direct placing concrete C and lining by a segment S if necessary, a gable-end form 43 is made retractable up to a position where the gable-end form 43 does not project more than a cylinder tip of a shield jack 35, and a spreader 36 is assembled to a large diameter part 35c eccentrically provided on the tip of a rotatable piston rod of the shield jack such that the spreader 36 is slidable in a direction perpendicular to the shaft center of the poston rod, and the spreader is provided in such a manner that a position where the center of the spreader corresponds to an inner form M and a position where the center of the spreader corresponds to the segment S are capable of being selectably positioned for the spreader.

Description

  In the present invention, during tunnel construction, depending on the excavation conditions (environment) such as the presence or absence of adjacent structures and changes in soil and water pressure, the tunnel is excavated by switching between lining with direct-acting concrete and lining with segments at any time. The present invention relates to a lining switching tunnel excavator and a lining switching method.

  An example of this type of tunnel excavator is disclosed in Patent Document 1.

  In this method, the straight part of the tunnel is covered with direct cast (on-site) concrete, and the (steep) curved part is covered with segments. Specifically, first, an inner plate that can be removed is attached to the inside of the tail plate of a shield machine that can be lined with segments, and this inner plate is used as an outer mold frame along the inner circumference of the inner plate. After assembling the inner formwork, placing reinforcing bars between the inner plate and the inner formwork, placing concrete, and lining the straight part with direct cast concrete. Next, when the branch point between the straight part and the sharp curve part is reached, the inner plate is separated from the tail plate of the shield machine, and one or two ring branch segments are attached and fixed to the inner plate, and the branch segment receives the reaction force. As described above, the shield machine is advanced to push the branch segment to the outside of the tail plate together with the inner plate, and then the normal segment is assembled inside the tail plate to cover the sharp curve portion by the segment.

Japanese Examined Patent Publication No. 7-86317 JP 2000-291378 A

  However, in the tunnel excavator as disclosed in Patent Document 1, the attachment and removal of the ring-shaped large formwork and the assembly and disassembly of the large inner plate corresponding to the main body of the shield machine Since (separation) is performed every time the lining method is switched, there is a problem that the switching work becomes large and cannot be switched in a short period of time.

  In addition, since the shield excavator is configured to move forward with the wife formwork as the reaction force of the propulsion jack, the shape and structure of the wife formwork are complicated and large, resulting in an increase in cost. It was.

  Therefore, it is conceivable to apply the shield jack mechanism disclosed in Patent Document 2 and replace the spreader (shield jack shoe) between a position corresponding to the segment and a position corresponding to the wife formwork. However, it is necessary to change the spreader (shield jack shoe), which is a heavy object, and there is a problem that a large amount of support device and work scaffold are required for this, and the work takes a lot of time and effort. .

  The present invention relates to a tunnel excavation switchable digging excavator that can easily and quickly switch between lining with direct-cast concrete and lining with segments and shortening the length of the excavator body. The purpose is to provide a method for switching the work.

In order to achieve such an object, the lining switching type tunnel excavator according to the present invention includes:
A wife formwork that is used for lining with directly cast concrete and has a plurality of propulsion jacks in the circumferential direction of the excavator body to take the digging reaction force to the existing inner formwork or segment. In the tunnel digging type tunnel excavator capable of excavating the tunnel by switching between lining with direct-cast concrete and lining with segments at any time,
While allowing the wife formwork to be retracted to a position that does not protrude from the cylinder tip of the propulsion jack,
A spreader is slidably assembled in a direction perpendicular to the piston rod axis to a large diameter part provided eccentrically at the tip of the rotatable piston rod of the propulsion jack, and the center of the spreader corresponds to at least the inner mold frame. It is characterized in that it can be selectively positioned at a position and a position corresponding to a segment.

Also,
The spreader is slidable in a direction orthogonal to the piston rod axis and can be positioned at a position whose center coincides with the piston rod axis.

Also,
The large-diameter portion is provided with a centering hooked pin for aligning the center of the spreader with the piston rod axis, and a plurality of position setting screw holes and spreader mounting screw holes. on the other hand,
The spreader includes a mounting portion having a slide groove into which the centering flanged pin is fitted, and an abutting portion pin-coupled to the mounting portion. The mounting portion is screwed into the position setting screw hole. The center of the spreader is positioned at a position corresponding to the inner mold frame or a position corresponding to the segment by the set bolt to be fitted, and screwed into the spreader mounting screw hole via a bolt insertion hole provided in the mounting portion. The center of the spreader is fixed at a position corresponding to the inner frame or a position corresponding to the segment by the spreader mounting bolt.

Also,
The spreader is positioned at a position where the center of the spreader coincides with the piston rod axis center by engaging a stopper provided in the slide groove with the centering flange pin in the mounting portion. To do.

The lining switching method according to the present invention for achieving such an object is as follows:
A wife formwork that is used for lining with directly cast concrete and has a plurality of propulsion jacks in the circumferential direction of the excavator body to take the digging reaction force to the existing inner formwork or segment. In the lining switching method using a tunnel excavator capable of excavating a tunnel by switching between lining with direct-casting concrete and lining with a segment at any time, in a work position and a retreat position,
In a state where the end form frame is retracted to a position where it does not protrude from the cylinder tip of the propulsion jack, a spreader is attached to the piston rod shaft with respect to a large-diameter portion eccentrically provided at the tip of the piston rod that can rotate. The lining is switched by sliding in the direction orthogonal to the center and selectively positioning the center of the spreader at least at a position corresponding to the inner mold frame and a position corresponding to the segment.

Also,
The spreader is slid in a direction orthogonal to the piston rod axis, and the center of the spreader is positioned at a position coincident with the piston rod axis.

  According to the lining switching type tunnel excavator and the lining switching method according to the present invention, the spreader is slid with respect to the tip of the piston rod of the propulsion jack under the state in which the end formwork is retracted so that the center of the spreader is centered. By selectively positioning the position corresponding to the inner mold and the position corresponding to the segment, it is possible to easily perform the lining with the direct-cast concrete and the lining with the segment as needed without changing the spreader. It can be switched in a short period.

  In addition, since the end frame can be retracted to a position where it does not protrude from the tip of the cylinder of the propulsion jack, the work space behind the spreader can be increased by retreating the piston Rondo contraction position of the propulsion jack, and accordingly, the length of the excavator body Can be shortened.

It is a principal part expanded sectional view of the mud pressure type shield excavator which shows one Example of this invention. It is explanatory drawing of the piston rod front-end | tip of a propulsion jack, The figure (a) is a side view, The figure (b) is a front view, The figure (c) is a front view of a different action state. It is a principal part expanded plane sectional view of a propulsion jack. FIG. 2A is a side sectional view of a state in which the center of the spreader is at a position corresponding to a segment, and FIG. 2B is a front view of FIG. FIG. 4A is an explanatory view of a propulsion jack, in which FIG. 4A is a side sectional view showing a state in which the center of the spreader has moved from the state of FIG. 4A to a position coincident with the piston rod axis, and FIG. FIG. FIG. 4A is an explanatory view of a propulsion jack, in which FIG. 4A is a side sectional view of the piston rod tip rotated 180 degrees from the state of FIG. 4B, and FIG. 4B is a front view of FIG. FIG. 4A is a side view of the propulsion jack in which the center of the spreader has moved from the state of FIG. 4C to a position corresponding to the inner mold frame, and FIG. It is a front view. It is a schematic structure side sectional view of a mud pressure type shield excavator. It is a switching process diagram from lining by segment to lining by direct-cast concrete → lining by segment. It is a switching process diagram from lining by segment to lining by direct-cast concrete → lining by segment. It is a switching process diagram from lining by segment to lining by direct-cast concrete → lining by segment. It is a switching process diagram from lining by segment to lining by direct-cast concrete → lining by segment.

  Hereinafter, the lining switching type tunnel excavator and the lining switching method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an enlarged cross-sectional view of a main part of a mud pressure shield excavator showing an embodiment of the present invention, FIG. 2 is an explanatory view of the tip of a piston rod of a propulsion jack, FIG. 1 (a) is a side view, and FIG. ) Is a front view, FIG. 3 (c) is a front view of different operating states, FIG. 3 is an enlarged plan sectional view of the main part of the propulsion jack, FIG. 4A is an explanatory view of the propulsion jack, and FIG. FIG. 4B is a front view of FIG. 4A, FIG. 4B is an explanatory view of the propulsion jack, and FIG. 4A is the center of the spreader. FIG. 4A is a side sectional view showing a state where the piston rod has moved from the state shown in FIG. 4A to a position coincident with the piston rod axis, FIG. 4B is a front view thereof, and FIG. 4C is an explanatory view of the propulsion jack. a) is a side sectional view of the piston rod tip rotated 180 degrees from the state shown in FIG. 4B, and FIG. FIG. 4A is a front view of the propulsion jack, FIG. 4D is a side sectional view of the state in which the center of the spreader has moved from the state of FIG. 4C to a position corresponding to the inner mold frame, and FIG. Fig. (B) is a front view of Fig. (A), Fig. 5 is a schematic sectional side view of a mud pressure shield excavator, and Figs. 6A to 6D are lining with a segment → lining with direct-cast concrete → lining with a segment It is a switching process figure to construction.

  The lining switching type tunnel excavator described in the present embodiment constructs a tunnel while stabilizing the face by filling the chamber with excavated sediment and discharging the soil while maintaining the inside of the chamber at a predetermined pressure. A mud pressure shield excavator.

  As shown in FIG. 5, the excavator body 11 of the mud pressure shield excavator 10 has a front cylinder 12 and a rear cylinder 13 that are formed in a cylindrical shape having substantially the same diameter, and are connected to each other by a connecting shaft 14 so as to be bent right and left. It can be bent by a plurality of middle folding jacks 15 installed between the two. A rotating ring 16 is rotatably supported on the front portion of the front barrel 12, and a cutter head 18 is connected to the rotating ring 16 via a connecting beam 17.

  The cutter head 18 is configured such that a plurality of cutter spokes 19 are arranged radially from the center portion, and the respective front end portions are connected by an outer peripheral ring 20. A fishtail cutter 21 is attached to the center of the cutter head 18, while a plurality of cutter bits 22 are attached to both sides of each cutter pork 19 along the longitudinal direction thereof. A copy cutter 23a and a rescue bit 23b for performing excessive digging are provided at the front end portion so as to freely appear and disappear.

  A ring gear 24 is fixed to the rear portion of the rotary ring 16, and a plurality of cutter turning motors 25 are attached to the front trunk 12 of the excavator body 11. A drive gear 26 of each cutter turning motor 25 is provided. Meshes with the ring gear 24. Accordingly, when the cutter turning motor 25 is driven to drive the drive gear 26 to rotate, the cutter head 18 can be rotated via the ring gear 24, the rotating ring 16, and the connecting beam 17.

  In addition, a bulkhead 27 is provided at the front portion of the front cylinder 12 so as to be located behind the cutter head 18, and a chamber 28 is formed between the cutter head 18 and the bulkhead 27 for filling excavated earth and sand. Yes. A plurality of fixed stirring rods 29 project from the front side of the bulkhead 27, while a plurality of swirling stirring rods 30 project from the rear surface side of the cutter head 18. A part of the fixed stirring rod 29 is provided with a not-shown mud-material injection port for injecting a mud-material into the excavated sediment in the chamber 28, and a not-shown chemical-solution injection tube for injecting a chemical (consolidated material). Is provided. In the excavator main body 11, a screw conveyor 33 for carrying the excavated earth and sand to the outside is disposed, and the front portion is inclined downward to penetrate the bulkhead 27 and open into the chamber 28. ing.

  A ring garter 34 is fixed to the rear cylinder 13 of the excavator body 11 along the inner peripheral surface thereof, and a plurality of shield jacks (propulsion jacks) 35 are arranged on the ring garter 34 in the circumferential direction of the rear cylinder 13. The excavator body 11 can be advanced by the reaction force by extending the shield jack 35 rearward and pressing a spreader 36, which will be described later, against the existing inner frame M.

  A plurality of the inner molds M are assembled in a ring shape in the circumferential direction with a predetermined interval on the inner wall surface of the tunnel (the peripheral wall of the natural ground G). The concrete is cast directly into the space (concrete placement space E) between the peripheral wall of the inner formwork M and the outer peripheral surface of the inner formwork M by a concrete placement device, which will be described later, thereby constructing a lining tunnel with direct placement concrete Is done. Further, the inner mold frame M is assembled in a plurality of stages in the longitudinal direction of the tunnel.

  Further, a swiveling ring 38 is supported on the ring gutter 34 so as to be able to swivel along the circumferential direction of the inner wall surface of the tunnel, and can be driven and swiveled by a drive motor (not shown). An erector 39 for assembling the segment S to be performed is provided. Further, a pair of left and right columns 40 are fixed to the ring gutter 34, and a substantially horizontal frame 41 is extended rearward from the column 40. The frame 41 has an inner mold frame M or a segment described later. A pair of front and rear shape holding devices 42 for assisting in assembling S are mounted so as to be movable in the front-rear direction of the excavator body 11.

  In addition, a plurality of transfer carts (not shown) are connected to the rear end of the gantry 41, and an inner mold release device for releasing the inner mold M at the rear stage, and the inner mold release device are connected to these transfer carts. A hoist that transports the inner mold frame M that has been removed in step 1 to the front of the tunnel, a power unit of a concrete placing device, and the like are mounted.

  Furthermore, between the rear trunk (skin plate) 13 and the inner mold frame M, there is a ring-shaped wife mold frame 43 that forms a concrete placement space E between the inner mold frame M and the peripheral wall of the natural ground G. A plurality of wife formwork jacks 44 are arranged in the circumferential direction so as to be arranged in front of the head, and each head base end portion penetrates the ring gutter 34 and the inner peripheral portion of the rear barrel 13 The front end of each rod is connected to the end form frame 43 while being rearranged at two places in the front-rear direction (see FIG. 6B). A rubber seal member 45 (not shown) is attached to the outer peripheral surface of the end form frame 43 along the circumferential direction, and a metal brush seal 46 is provided on the inner peripheral surface of the end form frame 43 in the peripheral direction. (See FIG. 1 etc.).

  Therefore, the ring-shaped wife form frame 43 can be moved back and forth (in the digging direction) by expanding and contracting the wife form frame jack 44, and at this time, the seal member 45 is pressed against the inner peripheral surface of the rear barrel 13. At the same time, the brush seal 46 is pressed against the outer peripheral surface of the existing inner mold M, so that the water intrusion into the excavator body 11 can be prevented.

  A plurality of concrete placement pipes 47 are inserted into the end form frame 43 at a predetermined interval in the circumferential direction toward the front of the excavation direction, and the concrete placement pipes 47 are closed valve devices 48 described later. It is possible to communicate with a concrete placement pipe (hose: concrete placement line) 49 by switching the switch. These concrete placement pipes 49 are communicated with a concrete supply source via the power unit on the transport carriage described above.

  Therefore, under the condition that the concrete placement pipe 47 and the concrete placement pipe 49 are communicated with each other by the closing valve device 48, the ready-mixed concrete fed from the concrete supply source is connected to the concrete placement pipe 49 and the concrete placement pipe 47. It passes through the concrete placement space E described above. At this time, in the concrete placement space E, the concrete placement pipes 47 are sequentially placed in the circumferential direction.

  The inner mold M, the end mold 43, the concrete placing pipe 47, the concrete placing pipe 49, the closing valve device 48 and the like constitute a concrete placing apparatus.

  In the present embodiment, as shown in FIG. 1, during the lining by the segment S, the end frame 43 can be retracted to a position where it does not protrude from the tip of the cylinder portion 35 a of the shield jack 35. That is, the head base end portion of the end form jack 44 penetrates to the deepest part of the ring garter 34 having a multi-layer structure and is connected to the front connection portion 50a of the inner periphery of the rear barrel 13, while the rod of the end form jack 44 is The end form frame 43 connected to the front end portion is completely accommodated in an annular storage portion 51 formed on the outer periphery of the rear portion of the ring gutter 34. In FIG. 1, S is a normal segment, and Sa is a special segment to which an air bag type packing (sealing device) 52 is attached.

  The piston rod portion 35b of the shield jack 35 is rotatably accommodated in the cylinder portion 35a, and the large-diameter portion 35c at the tip thereof is formed eccentrically with the piston rod axis. Then, as shown in FIG. 2, a center adjusting rod 53 is placed on the front end surface of the large diameter portion 35c on the piston rod shaft center (C1). A plurality of position setting screw holes 54 and spreader mounting screw holes 55 are formed on both sides of the attached pin 53.

  The position setting screw hole 54 is formed by using a set bolt 56 (see FIG. 3 or the like) screwed into the screw hole 54 so that the center of a spreader 36 described later corresponds to the segment S (C2) or the inner mold frame. Each is positioned at a position (C3) corresponding to M, and a total of four are provided in two locations corresponding to each position.

  The spreader mounting screw hole 55 is formed by a spreader mounting bolt 57 (see FIG. 3 or the like) that is screwed into the spreader mounting screw hole via a bolt insertion hole 58 (see FIG. 3 or the like) provided in the spreader 36 described later. The center of the spreader 36 is positioned and fixed at a position (C2) corresponding to the segment S or a position (C3) corresponding to the inner mold frame M, and the spreader 36 is attached by eight spreader mounting bolts 57 at each position. A total of 12 are provided.

  Further, as shown in FIG. 3, the spreader 36 includes a mounting portion 36a and an abutting portion 36b coupled to the mounting portion 36a with a pin 60, and the above-described centering flange is provided on the seating surface of the mounting portion 36a. A slide groove 59 into which the flange portion 53a of the pin 53 is fitted is formed in a direction perpendicular to the piston rod axis (C1), and the bolt insertion hole 58 described above is located on both sides of the mounting portion 36a. 8 holes are drilled.

  Further, on both side portions of the mounting portion 36a, engaging protrusions are formed that engage with the set bolts 56 screwed into the position setting screw holes 54 described above. Furthermore, a stopper 62 is attached to the slide groove 59, and the stopper 62 engages with the centering flange pin 53 (strictly, the flange portion 53a), so that the center of the spreader 36 becomes the piston rod axis ( It is positioned at a position coinciding with C1).

  In FIG. 3, 36d is a lining material affixed to the contact surface of the contact portion 36b, 63 is a jig mounting hole for rotating the piston rod 35b and the large diameter portion 35c, and 64 is the piston rod 35b. And a hole for a suspension piece that is appropriately formed in the rib 36c in order to fix the spreader 36 when the large-diameter portion 35c is rotated.

  Therefore, as shown in FIG. 4A, when positioning the center of the spreader 36 at the position (C2) corresponding to the segment S, the large-diameter portion 35c of the piston rod 35b moves from the piston rod axis (C1) to the excavator body 11. Under the state of rotating so as to project largely to the outer peripheral side (the states of (a) and (b) of FIG. 2), the mounting portion 36 a of the spreader 36 is engaged with the engaging protrusion 61 on the outer peripheral side of the excavator body 11. Is then slid largely until it engages with the set bolt 56, and then fixed to the large diameter portion 35c with the spreader mounting bolt 57. At this time, the set bolt 56 is screwed into a predetermined position setting screw hole 54 far from the piston rod axis (C1), and is removed after the fixing.

  When the center of the spreader 36 is switched from the position (C2) corresponding to the segment S described above to the position (C3) corresponding to the inner mold frame M, first, as shown in FIG. The attachment portion 36a is slid largely on the inner peripheral side of the excavator body 11 until the stopper 62 engages with the flange portion 53a of the centering flange pin 53, and the center of the spreader 36 is centered on the piston rod axis (C1). Position it at a position that matches.

  That is, only the large-diameter portion 35c is rotated by 180 degrees in the subsequent process (this is because the rotation radius is increased when the large-diameter portion 35c is rotated together with the spreader 36 while the center of the spreader 36 remains at the position (C2) corresponding to the segment). Since the spreader 36 is freed by removing the spreader mounting bolts 57 because it is large and interferes with other objects and cannot be rotated together with the spreader 36, the piston rod is once in a fixed position (hanging position). It is positioned at a position that coincides with the axis (C1).

  Next, as shown in FIG. 4C, the large-diameter portion 35c of the piston rod 35b is connected to the piston rod shaft using the jig mounting hole 63 in a state where the spreader 36 is fixed using the suspension piece hole 64. It rotates so that it may protrude largely from the center (C1) to the inner peripheral side of the excavator body 11. In this state, both the large diameter portion 35c and the spreader 36 are positioned on the inner peripheral side of the excavator body 11 with respect to the cylinder portion 35a of the propulsion jack 35. There is no hindrance to forward movement and retreat movement.

  Then, as shown in FIG. 4D, after the mounting portion 36a of the spreader 36 is slid to the outer peripheral side of the excavator main body 11 by a predetermined eccentric amount until the engaging projection 61 is engaged with the set bolt 56, the spreader By fixing to the large diameter portion 35c with the mounting bolt 57, the center of the spreader 36 can be switched to the position (C3) corresponding to the inner mold frame M described above. At this time, the set bolt 56 is screwed into a predetermined position setting screw hole 54 slightly apart from the piston rod axis (C1), and is removed after the fixing.

  Further, as shown in FIG. 1, a tail packing 66 used in lining by the segment S is detachably embedded in a shallow recess 65 formed in an annular shape on the rear inner peripheral surface of the rear barrel 13. At the time of lining with the direct-working concrete C, it is removed and can be replaced with a flush plate 67 (see FIG. 6B and the like) for keeping the inner peripheral surface of the rear barrel 13 flush.

  Since it is configured in this manner, under the tunnel construction of the lining by the segment S shown in FIG. 1, when the lining by the directly cast concrete C is necessary due to the change of the excavation condition (environment), FIG. As shown in the drawing, the special segment Sa having the air bag type packing 52 built therein is assembled for one ring at the stage of assembling the final segment (see (a) of FIG. 6A).

  Next, while expanding the air bag type packing 52, the shield jack 35 is extended and dug until the air bag type packing 52 reaches the tail end position of the rear barrel 13 (see (b) of FIG. 6A). The special segment Sa is disassembled and the tail packing 66 is removed from the shallow recess 65 (see (c) of FIG. 6A).

  Next, after the shield jack 35 is contracted, the spreader 36 is slid from the state of FIG. 4A where the center of the spreader 36 is at the position (C2) corresponding to the segment S, and the center of the spreader 36 is the piston rod axis (C1). 4B in the position coincident with (), and then the large-diameter portion 35c is rotated 180 degrees to the state shown in FIG. 4C (see (d) of FIG. 6A).

  Next, a flush plate 67 is attached to the shallow recess 65 (see (e) of FIG. 6B), and then the end form jack 44 connected to the front connection part 50a is extended to push out the end form frame 43. Start (see (f) of FIG. 6B).

  Next, after the spreader 36 is slid so that the center of the spreader 36 is in the position (C3) corresponding to the inner mold frame M as shown in FIG. 4D, the wife mold jack 44 is replaced with the rear connecting portion 50b. Then, the assembly of the inner mold M is started (see (g) of FIG. 6B). Next, the shield jack 35 is extended to move the inner mold frame M to the front of the wife mold frame 43 (see (h) in FIG. 6B).

  Next, the shield jack 35 is contracted to assemble, for example, two inner frames M (see (i) in FIG. 6C). Thereafter, the air bag type packing 52 is further expanded to extend the seal jack 35. Synchronously, the end form jack 44 is extended and concrete C is placed in the concrete placement space E from the end form frame 43 (see (j) of FIG. 6C).

  Hereinafter, the tunnel construction of the lining with the directly cast concrete C is performed by alternately performing the assembly and the excavation of the inner formwork M (see (k) in FIG. 6C).

  After this, when lining by the segment S is required again due to changes in the excavation conditions (environment), the shield jack 35 is extended to extend the front end surface of the end form 43, the final inner form M, and the front side. (See (l) in FIG. 6C.) After that, in synchronization with the shrinkage of the shield jack 35, the wife formwork jack 44 is shrunk by one ring, so that the final inner formwork M is disassembled (see (m) in FIG. 6D).

  Next, the spreader 36 is slid from the state of FIG. 4D in which the center of the spreader 36 is at the position (C3) corresponding to the inner mold frame M, and the center of the spreader 36 is at the position that coincides with the piston rod axis (C1). After the state shown in FIG. 4C, the wife form frame jack 44 is changed from the rear connection position 50b to the front connection position 50a and contracted to retract the wife form frame 43 into the annular storage part 51, and then the shallow recess 65 Remove the flush plate 67 (see (n) of FIG. 6D).

  Next, after the state of FIG. 4B in which the large diameter portion 35c is rotated 180 degrees from the state of FIG. 4C in which the center of the spreader 36 is located at the position coincident with the piston rod axis (C1), the spreader 36 is slid. 4A where the center of the spreader 36 is at a position corresponding to the segment, the tail packing 66 is attached to the shallow recess 65 and the segment S is assembled (see (o) of FIG. 6D).

  Hereinafter, the tunnel construction of the lining by the segment S is performed by alternately performing the assembly and the excavation of the segment S. (See (p) in FIG. 6D).

  It should be noted that when the lining with the directly-cast concrete C is necessary again due to a change in the excavation conditions (environment), it is obvious that the reverse of the above-described process is performed, and the description thereof will be omitted.

  In this way, according to the present embodiment, the large diameter portion 35c provided at the tip of the piston rod of the shield jack 35 is rotated 180 degrees with the end form frame 43 retracted, and the large diameter portion 35c On the other hand, the spreader 36 is slid so that the center of the spreader 36 is selectively positioned at the position corresponding to the inner mold frame M and the position corresponding to the segment S. The lining by C and the lining by the segment S can be easily switched in a short period as necessary.

  That is, as in the prior art, attachment and removal (disassembly / removal) of the ring-shaped large formwork 43 and assembly and disassembly (separation) of a large inner plate corresponding to the rear trunk 13 of the excavator body 11 are performed. You don't have to.

  Further, since the end frame 43 is retracted to the position where it does not protrude from the tip of the cylinder portion 35a of the shield jack 35 by the annular storage portion 51, the spreader 36 is retracted by the retraction of the piston rondo 35b in the shield jack 35. The rear working space can be increased, and the length of the excavator body 11 can be reduced accordingly. Therefore, improvement in workability and cost reduction can be achieved.

  In the above embodiment, the spreader 36 is slid with respect to the large-diameter portion 35c of the piston rod 35b in the shield jack 35, and the center of the spreader 36 corresponds to the position (C2) corresponding to the segment S and the inner mold frame M. It is positioned (fixed) at three positions corresponding to the position (C3) and the piston rod axis (C1), but depending on the diameter of the excavator body 11, the center of the spreader 36 may be the inner mold frame. The position (C3) corresponding to M may be a position corresponding to the piston rod axial center (C1). In such a case, the position (C2) where the center of the spreader 36 corresponds to the segment S and the inner mold frame It is positioned (fixed) at two positions of the position (C3) corresponding to M (that is, the position corresponding to the piston rod axis (C1)).

  Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

  The lining switching type tunnel excavator according to the present invention is not limited to a mud pressure shield excavator but can also be applied to a mud shield excavator, a mechanical shield excavator, a tunnel boring machine (TBM), and the like.

  DESCRIPTION OF SYMBOLS 10 Mud pressure shield excavator, 11 Excavator main body, 12 Front trunk, 13 Rear trunk, 14 Connecting shaft, 15 Folding jack, 16 Rotating ring, 17 Connecting beam, 18 Cutter head, 19 Cutter pork, 20 Outer ring, 21 Fish Tail Cutter, 22 Cutter Bit, 23a Copy Cutter, 23b Rescue Bit, 24 Ring Gear, 25 Cutter Swivel Motor, 26 Drive Gear, 27 Bulkhead, 28 Chamber, 29 Fixed Stir Bar, 30 Swivel Stir Bar, 33 Screw Conveyor, 34 Ring garter, 35 Shield jack, 35a Cylinder part, 35b Piston rod part, 35c Tip large diameter part, 36 Spreader, 36a Mounting part, 36b Abutting part, 36c Rib, 36d Lining material, 38 Swivel ring, 39 Elector , 40 struts, 41 mounts, 42 shape retaining device, 43 wife formwork, 44 wife formwork jack, 45 seal member, 46 brush seal, 47 concrete placement pipe, 48 block valve device, 49 concrete placement pipe, 50a Front connecting part, 50b Rear connecting part, 51 Ring-shaped storage part, 52 Air bag type packing (sealing device), 53 Centering flanged pin, 53a collar part, 54 Position setting screw hole, 55 Spreader mounting screw hole , 56 set bolt, 57 spreader mounting bolt, 58 bolt insertion hole, 59 slide groove, 60 pin, 61 engaging projection, 62 stopper, 63 jig mounting hole, 64 suspension piece hole, 65 shallow recess, 66 tail Packing, 67 flat plate, C concrete, E concrete placement space, G ground, M Frame, S segment, Sa special segment.

Claims (6)

A wife formwork that is used for lining with directly cast concrete and has a plurality of propulsion jacks in the circumferential direction of the excavator body to take the digging reaction force to the existing inner formwork or segment. In the tunnel digging type tunnel excavator capable of excavating the tunnel by switching between lining with direct-cast concrete and lining with segments at any time,
While allowing the wife formwork to be retracted to a position that does not protrude from the cylinder tip of the propulsion jack,
A spreader is slidably assembled in a direction perpendicular to the piston rod axis to a large diameter part provided eccentrically at the tip of the rotatable piston rod of the propulsion jack, and the center of the spreader corresponds to at least the inner mold frame. A tunnel excavator with a lining switchable type, characterized in that it can be selectively positioned at a position corresponding to a position and a segment.   2. The lining switching according to claim 1, wherein the spreader is slid in a direction perpendicular to the piston rod axis so that the center thereof can be positioned at a position coincident with the piston rod axis. Type tunnel excavator. The large-diameter portion is provided with a centering hooked pin for aligning the center of the spreader with the piston rod axis, and a plurality of position setting screw holes and spreader mounting screw holes. on the other hand,
The spreader includes a mounting portion having a slide groove into which the centering flanged pin is fitted, and an abutting portion pin-coupled to the mounting portion. The mounting portion is screwed into the position setting screw hole. The center of the spreader is positioned at a position corresponding to the inner mold frame or a position corresponding to the segment by the set bolt to be fitted, and screwed into the spreader mounting screw hole via a bolt insertion hole provided in the mounting portion. The lining switching type tunnel excavator according to claim 1 or 2, wherein the center of the spreader is fixed at a position corresponding to the inner formwork or a position corresponding to the segment by the spreader mounting bolt.   The spreader is positioned at a position where the center of the spreader coincides with the piston rod axis center by engaging a stopper provided in the slide groove with the centering flange pin in the mounting portion. The lining switching type tunnel excavator according to claim 3. A wife formwork that is used for lining with directly cast concrete and has a plurality of propulsion jacks in the circumferential direction of the excavator body to take the digging reaction force to the existing inner formwork or segment. In the lining switching method using a tunnel excavator capable of excavating a tunnel by switching between lining with direct-casting concrete and lining with a segment at any time, in a work position and a retreat position,
In a state where the end form frame is retracted to a position where it does not protrude from the cylinder tip of the propulsion jack, a spreader is attached to the piston rod shaft with respect to a large-diameter portion eccentrically provided at the tip of the piston rod that can rotate. A cover that is slid in a direction perpendicular to the center and selectively positions the center of the spreader at least at a position corresponding to the inner mold frame and a position corresponding to the segment, and switching the lining. Engineering switching method.   6. The lining switching method according to claim 5, wherein the spreader is slid in a direction orthogonal to the piston rod axis to position the center of the spreader at a position coincident with the piston rod axis.

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