JP4841476B2 - Tunnel lining concrete casting structure - Google Patents

Description

  The present invention relates to a tunnel lining concrete placement structure used in a tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork.

  For example, in tunnel construction methods such as the mountain tunnel construction method, a tunnel lining formwork (concrete lining mold is used as a method for forming tunnel lining concrete that is constructed to cover the natural ground on the inner peripheral surface of the excavated tunnel. A method using a frame is generally employed. As shown in FIGS. 9 (a) and 9 (b), the tunnel lining formwork 50 is formed on the side wall of the tunnel 53 along the inner peripheral surface 54 of the tunnel 53 having a shape including an arch-shaped portion 52 such as a horseshoe shape. A lining space 61 between the installed tunnel lining form 50 and the ground covered with the sprayed concrete 56 on the inner peripheral surface 54 of the tunnel 53. In addition, lining concrete is formed so as to be continuous with the concrete of the invert portion 51 at the bottom of the tunnel, preferably by placing and hardening unreinforced concrete.

  Moreover, as the tunnel lining formwork 50, for example, in addition to the assembly type tunnel lining formwork called paracentle, a mobile tunnel lining formwork called slide centle is known. With the progress of the excavation work, the tunnel lining formwork 50 is moved from the rear to the front in the digging direction of the tunnel 53 while the tunnel lining formwork 50 is reinstalled every predetermined span of about 10 m, for example. Then, the side and upper lining concrete of the tunnel 53 is sequentially cast and formed.

  And in order to cast the lining concrete of the side part and the upper part of the tunnel using the tunnel lining formwork 50, for example, as shown in FIGS. For example, an area from the side wall portion 55 of the tunnel 53 to the shoulder portion of the arch-shaped portion 52 is provided through the inspection window 56 as a height region where concrete can be placed from the inspection window 56 provided in the mold 50. The concrete 57 is supplied and the vibrator 58 is inserted from the inspection window 56, and the concrete 57 is placed while the supplied concrete 57 is compacted. After that, as a height region that is difficult to be compacted by the vibrator 58 while supplying the concrete 57 from the inspection window 56, the tunnel 53 (see FIG. 9) region of the tunnel 53 is referred to as a tunnel region. Concrete is driven by a blow-up method from a concrete casting hole 60 as a blow-up opening provided at the top end of the lining mold 50, and the concrete 57 of the crown 59 is formed without compacting directly using a vibrator. The pattern to be used is adopted.

  More specifically, after the tunnel lining formwork 50 is installed at a predetermined position, for example, the concrete 57 is poured from the lower portion of the side wall portion 55 through the lower inspection window 56 and compacted using the vibrator 58. (See FIG. 10 (a)), and further, a step of compacting using the vibrator 58 while pouring the concrete 57 through the middle inspection window 56 toward the arch-shaped portion 52 at the upper part of the side wall 55 (FIG. 10 ( b)), and further to the front of the crown 59 of the arch-shaped portion 52, the concrete 57 is poured through the upper inspection window 56 and, if necessary, the concrete placement hole 60, and then compacted using the vibrator 58. The process (see FIG. 10C) and the concrete from the portion on the existing lining concrete 62 side of the crown portion 59 through the concrete placement hole 60 in order. It poured over preparative 57, by a step of filling concrete to wife formwork 63 without compaction using direct vibrator (see FIG. 10 (d)), so that the lining concrete is pouring.

  With the conventional method for placing lining concrete using the tunnel lining formwork 50 as described above, the concrete 57 placed on the tunnel crown (crown) 59 cannot be compacted. The reliability of the lining concrete at the crown portion 59 is lowered, and in the vicinity of the existing lining concrete 62, air accumulation and cavities are likely to occur. Further, since the concrete 57 is poured into the lining space 61 between the tunnel lining formwork 50 and the natural ground in a concentrated manner from the concrete placing hole 60 as a blow-up opening, the concrete 57 is put into the concrete placing hole. The trajectory when flowing from 60 to the surroundings tends to remain on the surface of the lining concrete as a striped pattern, resulting in poor finish.

On the other hand, a technique is disclosed that enables the concrete placed in the tunnel crown to be compacted (see, for example, Patent Document 1). In the lining concrete placement method of Patent Document 1, when a tunnel is constructed by a shield method different from the mountain tunnel method, the crown portion of the gap between the segment and the centle extends over substantially the entire length in the tunnel axis direction. An extending guide rail with an L-shaped angle suspended in a concave direction and a rod-shaped vibrator that moves along the guide rail are installed, and concrete is placed in the gap in the crown portion from the existing side with a rod-shaped vibrator. It was cast while compacted, and the rod-shaped vibrator was moved along the guide rail from the existing side toward the end plate side as the concrete was filled. Moreover, in the lining concrete placement method of patent document 1, a guide rail is provided also as a setup line of secondary lining concrete, for example.
JP 2002-30893 A

  In the method of placing concrete on the crown portion of a tunnel described in Patent Document 1, a guide rail having an L-shaped angle that guides a rod-like vibrator in the tunnel axial direction is used as a rough guide in the axial direction of the tunnel at the concrete placement location. Since it is necessary to provide the entire length in advance, in a mountain tunnel or the like by a tunnel lining formwork in which lining concrete is preferably formed using unreinforced concrete without installing a setup bar or the like, A lot of waste is caused in the material and construction.

  On the other hand, in a mountain tunnel or the like by a tunnel lining formwork in which lining concrete is preferably formed using unreinforced concrete without installing a setup bar or the like, for example, as shown in FIG. As described above, a plurality of guide pieces having cable insertion holes arranged in series in the axial direction of the tunnel are provided on the outer peripheral surface of the tunnel lining formwork, It is conceivable to move the rod-shaped vibrator while pulling it from the existing lining concrete side toward the end form frame side by inserting and guiding a vibrator cable following the rod-shaped vibrator through the insertion hole.

Also, in the method of moving the rod-like vibrator by pulling the vibrator cable to the end frame side while guiding the vibrator cable with the guide piece having the insertion hole, the rod-like vibrator and the vibrator cable are used for tunnel lining before pouring the concrete. When concrete is poured into the lining space after setting it in the lining space on the outer periphery of the formwork, since the concrete has a considerable specific gravity, it is swept away by the concrete and the rod-like vibrator and vibrator cable are set. The vibrator cable may be bent or the vibrator cable may be bent. For this reason, the applicant of the present application previously described in Japanese Patent Application No. 2006-264086 , a fixed guide piece projecting on the outer peripheral surface of the tunnel lining formwork , and having a loose fitting fixing function of the vibrator cable. Before the concrete is poured into the lining space, the vibrator cable is held in the middle of the lining space in the thickness direction by a fixed guide piece. After placing concrete and pouring concrete, the vibrator cable was switched to the loose-fitting state, and the rod-shaped vibrator was pulled to the side of the wife formwork while vibrating. The structure has been developed and disclosed.

However, in the tunnel lining concrete placing structure of Japanese Patent Application No. 2006-264086 , when the vibrator cable is switched to the loosely fitted state and pulled to the end form frame side while vibrating the rod-like vibrator, the rod-like vibrator and the vibrator cable, In order to eliminate such obstacles, it is difficult to pull the rod-shaped vibrator or vibrator cable when the aggregate in the concrete is caught between clogging recesses of the fixed guide piece and becomes clogged. Development of new technology is desired.

  The present invention has been made paying attention to such a problem, the linearity of the vibrator cable when compacting the concrete poured into the lining space, through a fixed guide piece having a loose fitting fixing function. The rod-shaped vibrator and the vibrator cable can be easily and smoothly moved to the side of the frame by holding, and the aggregate is caught between the fixed guide piece and the rod-shaped vibrator and vibrator cable during the movement. The purpose is to provide a tunnel lining concrete placing structure that can eliminate the state where the aggregate is jammed even if it is jammed and can smoothly move the rod-like vibrator and vibrator cable. To do.

The present invention relates to a tunnel lining concrete placement structure used in a tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork, and the existing lining concrete and wife mold already formed. In the lining space between the outer peripheral surface of the tunnel lining formwork and the lining surface of the inner periphery of the tunnel, which is sandwiched by the frame, a rod-shaped vibrator is arranged close to the existing lining concrete, and to this Arranged in a state where it can be pulled from the outside of the end form by extending the end of the end form vibrator cable to the end form, and after pouring concrete into the lining space, The rod-shaped vibrator can be compacted with concrete while being moved toward the end form by pulling the vibrator cable. Before pouring concrete into the lining space, the vibrator cable is placed in a straight line in the axial direction of the tunnel while being held in the middle portion in the thickness direction of the lining space, and the concrete is poured. After that, the fixed guide piece having the function of loosely fitting the vibrator cable, which allows the vibrator cable to be switched to the loosely fitted state and to be pulled to the end frame side while vibrating the rod-like vibrator, is a tunnel shaft. A plurality of fixed guide pieces are arranged in series at intervals in the direction, and the fixed guide pieces protrude from the outer peripheral surface of the tunnel lining formwork so as to be slidable in the thickness direction of the lining space. It consists Jo member, from the superposition of notched recess of each plate-like member, the collapsible cable insertion hole is formed, the other of the plate-like portion of the one plate-like member The cable insertion hole is contracted and temporarily fixed in a state where the vibrator cable is sandwiched by the relative sliding movement with respect to the cable, the cable insertion hole is enlarged to make the vibrator cable loosely fitted, and the fixing guide The piece includes a peripheral opening mechanism that allows at least one notch recess of the pair of plate-like members to be opened to the outer peripheral edge of the fixed guide piece so that the vibrator cable can be detached from the cable insertion hole. The above object is achieved by providing a tunnel lining concrete placing structure characterized by the following.

  And in the tunnel lining concrete placement structure of the present invention, one plate-like member of the pair of plate-like members constituting the fixed guide piece is shallow facing outward in the thickness direction of the lining space. The other plate-shaped member has a deep cutout concave portion facing outward in the thickness direction of the lining space, and closes the cutout tip portion of the deep cutout recess. The occluding wire member is detachably provided by an operation from inside the tunnel, and the occluding wire member provided at the notch tip portion is removed from the notch tip portion as a peripheral opening mechanism, whereby the deep notch It is preferable to open the recess to the outer peripheral edge of the fixed guide piece.

  Moreover, in the tunnel lining concrete placement structure of the present invention, one plate-like member of the pair of plate-like members constituting the fixed guide piece is shallow and directed outward in the thickness direction of the lining space. The other plate-shaped member has a deep outer sandwiched recess facing inward in the thickness direction, and the deep outer sandwiched recess is on the side of the other plate-shaped member. By opening at the edge, the opening at the side edge of the deep outer sandwiching recess serves as a peripheral opening mechanism, and the shallow inner sandwiching recess is pulled down below the opening, thereby the deep outer sandwiching recess. Is preferably opened at the outer peripheral edge of the fixed guide piece.

  According to the tunnel lining concrete placement structure of the present invention, holding the linearity of the vibrator cable when compacting the concrete poured into the lining space via a fixed guide piece having a loose fitting fixing function, The rod-shaped vibrator and the vibrator cable can be moved easily and smoothly to the end form frame side, and the aggregate is caught between the fixed guide piece and the rod-shaped vibrator or vibrator cable during the movement. Even in this case, it is possible to eliminate the state in which the aggregate is caught and to smoothly move the rod-like vibrator and the vibrator cable.

  As shown in FIGS. 1A to 1C, a tunnel lining concrete placing structure according to a preferred embodiment of the present invention is used for tunnel lining as a concrete lining formwork in a mountain tunnel construction method, for example. When forming the lining concrete 11 on the side and upper portion of the tunnel 12 using the mold 10, the lining concrete 11a of the crown portion (crown portion) 13 of the tunnel 12 is placed below the concrete. For example, it is employed as a structure for placing the lining concrete 11 on the side wall portion and the arch-shaped portion of the tunnel 12 and then placing it while sufficiently compacting.

  Here, in this embodiment, the tunnel lining form 10 is, for example, a slide-movable centle known as the prior art, and a predetermined span of, for example, about 10 m as the tunnel 12 excavates. It is possible to sequentially cast and form the lining concrete 11 on the side portion and the upper portion of the tunnel 12 while re-installing the tunnel 12 from the rear to the front in the digging direction X. Moreover, in this embodiment, the lining concrete 11 of a side wall part and an arch-shaped part is concrete through the inspection window 14 provided in the installed tunnel lining formwork 10 by the method similar to the conventional construction method, for example. Is supplied, and a rod-like vibrator 14a as a vibration compaction device is inserted from the inspection window 14 to compact the supplied concrete, whereby the side wall portion and the arched portion of the lining concrete 11 are tunnel crown portions. It will be placed prior to the 13 lining concrete 11a.

  The tunnel lining concrete placement structure of the present embodiment is a concrete placement structure used in a tunnel lining concrete placement method in which lining concrete is formed using the tunnel lining formwork 10, which is shown in FIG. As shown in FIG. 4, between the outer peripheral surface of the tunnel lining mold 10 and the lining surface 22 on the inner periphery of the tunnel, which is sandwiched between the end surface 15 a of the existing lining concrete 15 and the end frame 16. In the lining space 23 of the tunnel crown 13 between them, a rod-like vibrator 22 is arranged close to the existing lining concrete 15, and a vibrator cable 19 following this is extended to the end form frame 16 side to form the end form. The rod-shaped vibrator 20 is arranged in a state where it can be pulled from the outside of the end frame 16 by penetrating the frame 16 and concrete is poured into the lining space 23. By pulling the vibrator cable 19 is intended to allow compaction of the concrete while moving his wife mold 16 side. Before pouring concrete into the lining space 23, the vibrator cable 19 is linearly arranged in the axial direction X of the tunnel 12 while being held at the middle portion in the thickness direction of the lining space 23, and temporarily fixed. The fixed guide piece 18 having the function of loosely fitting the vibrator cable 19 that allows the vibrator cable 19 to be switched to the loosely fitted state and to be pulled toward the end frame 16 side while vibrating the rod-like vibrator 20 is provided. A plurality of tunnels 12 are arranged in series at intervals in the axial direction X of the tunnel 12. The fixed guide piece 18 is composed of a pair of plate-like members 17a and 17b projecting from the outer peripheral surface of the tunnel lining form 10 so as to be slidable in the thickness direction Y of the lining space 23 (see FIG. 6). By overlapping the notch recesses 26a and 26b of the plate members 17a and 17b, a cable insertion hole 27 that can be expanded and contracted is formed, and by sliding relative to the other plate member 17b of one plate member 17a. The cable insertion hole 27 is reduced and temporarily fixed in a state where the vibrator cable 19 is sandwiched (see FIG. 4A), and the cable insertion hole 27 is enlarged to make the vibrator cable 19 loose (FIG. 4 ( b)), and the fixed guide piece 18 has the notch recess 26b of at least one of the pair of plate-like members 17a and 17b (the other plate-like member 17b). By opening the outer peripheral edge of the guide piece 18 (see FIG. 4 (c)), and a peripheral opening mechanism 28 to allow desorption of the vibrator cable 19 from the cable insertion hole 27.

  Further, in this embodiment, as shown in FIGS. 5A and 5B, one plate-like member 17a of the pair of plate-like members 17a and 17b constituting the fixed guide piece 18 is lining. While having a shallow notch recess 26a facing outward in the thickness direction Y of the space 23, the other plate-like member 17b is a deep notch recess 26b facing outward in the thickness direction Y of the lining space 23. A closing wire member 30 that closes the notch tip portion 29 of the deep notch recess 26b is provided so as to be removable by an operation from the inside of the tunnel lining mold 10. By removing the closing wire member 30 provided in the notch tip portion 29 from the notch tip portion 29 as the peripheral opening mechanism 28, the deep notch recess 26b is opened to the outer peripheral edge portion of the fixed guide piece 18. Are (see FIG. 4 (c)).

  In the present embodiment, each fixed guide piece 18 provided so as to protrude from the outer peripheral surface of the tunnel lining form 10 in the thickness direction Y of the lining space 23 so as to be slidable is provided in the tunnel as shown in FIG. The first plate-like member 17a as one plate-like member made of, for example, a steel plate and the second plate-like member 17b as the other plate-like member, which are arranged so as to overlap with each other in the 12 axial directions X. As shown in FIG. 5A, the first plate-like member 17a has a vertically long rectangular front shape with a width of about 120 mm and a height of about 450 mm, for example. A shallow notch recess 26a is provided by a semicircular notch that is edged in a shape. Further, in the substantially lower half portion of the first plate-like member 17a, two slide slits 31a and 31b are provided to extend in parallel in the vertical direction at the central portion and one side portion thereof. Yes. Further, a first locking hole 32a is formed adjacent to the upper end of the first slide slit 31a in a portion opposite to the second slide slit 31b across the first slide slit 31a at the center. While being formed, a second locking hole 32b and a third locking hole 32c are formed so as to be adjacent to the lower end portion of the first slide slit 31a. Furthermore, a stopper piece 33 is provided so as to protrude vertically from the lower end of the first plate-like member 17a. Further, a handle fitting 34 is attached so as to protrude laterally from each side end face of the first plate-like member 17a.

  As shown in FIG. 5 (b), the second plate-like member 17b has a vertically long rectangular front shape with a width of about 120 mm and a height of about 500 mm, for example. A deep cutout recess 26b is provided that is cut into a substantially rectangular shape and has a bottom portion formed in an arc shape. In addition, in the substantially lower half portion of the second plate-like member 17b, a single third slide slit 35 is provided extending in the vertical direction at the center thereof. Further, on both sides of the third slide slit 35, a fourth locking hole 36a and a fifth locking hole 36b are formed adjacent to the upper end portion of the third slide slit 35, and A sixth locking hole 36c and a seventh locking hole 36d are formed so as to be adjacent to the lower end of the third slide slit 35. Furthermore, a stopper piece 37 is provided so as to protrude vertically from the lower end of the second plate-like member 17b. A handle fitting 38 is attached so as to protrude laterally from the side end face of the first plate-like member 17b.

  In the present embodiment, a closing wire member 30 that closes the notch tip portion 29 of the deep notch recess 26b is attached to the second plate member 17b. The closing wire member 30 is made of, for example, a φ3 mm wire cable. One end of the closing wire member 30 is engaged with a handle metal fitting 38 protruding from one side end surface of the second plate-like material 17b, and is hung around the one side end surface. The wire insertion hole 39 (see FIG. 6) provided in the upper end portion of one side end surface is spanned to the wire insertion hole 39 provided in the upper end portion of the other side end surface, and is hung along the other side end surface. After being turned, it is firmly attached by being locked to the handle fitting 38 protruding from the other side end face. As a result, the closing wire member 30 is in a state in which the notch tip portion 29 of the deep notch recess 26b is closed by the portions extending over the wire insertion holes 39 on both sides, and when the vibrator cable 19 is temporarily fixed, The vibrator cable 19 can be sandwiched between the closing wire member 30 and the shallow notch recess 26a of the first plate member 17a (see FIG. 4A).

  Further, the closing wire member 30 attached in this way releases the locked state of the other end portion locked to the other handle metal fitting 38, for example, and is drawn into the one end portion side, so that the tunnel lining mold The operation from the inside of the frame 10 allows easy removal from the second plate member 17b (see FIG. 4C). In the first embodiment, the side end face of the second plate-like member 17b has a side end face so that the state where the closing wire member 30 is hung around the side end face of the second plate-like member 17b can be stably held. As shown in FIG. 5C, a contact groove 40 having a cross-sectional shape recessed inward is provided.

  In this embodiment, as shown in FIG. 6, the first plate member 17 a and the second plate member 17 b are arranged so as to overlap the axial direction X of the tunnel 12, and the tunnel lining formwork 10. In the state where it is arranged to be able to project into the lining space 23 through the insertion opening 41 of the fixed guide piece 18 formed in the above, and is supported by the support metal 42 attached to the tunnel lining mold 10, the support metal 42, slides forward and backward in the thickness direction Y of the lining space 23 from the outer peripheral surface of the tunnel lining formwork 10.

  That is, as shown in FIG. 7, the support metal 42 is formed by bending the upper end portion into a L-shaped cross-section with the joining flange portion 42a, for example, a metal plate having a width of about 120 mm and a height of about 250 mm. It is a member and is firmly attached by, for example, welding and fixing the joining flange portion 42 a to the inner surface of the tunnel lining formwork 10. Further, first to third pin locking holes 44a, 44b, and 44c for inserting and locking the fixing pin 43 are formed in the lower end portion of the support metal 42 at the center and at three locations on both sides thereof. .

  In this embodiment, the fixing pin 43 inserted and fixed in the central first pin locking hole 44a is fixed to the central portion of the first plate-like member 17a and the first slide slit 31a and the central portion of the second plate-like member 17b. The first plate-like member 17a and the second plate-like member 17b are used in the thickness direction of the covering space 23 with the first slide slit 31a and the third slide slit 35 as a guide. Slide forward and backward to Y. Further, the second pin locking hole 44b and the third pin locking hole 44c on both sides are formed by connecting the first to third locking holes 32a, 32b, 32c of the first plate member 17a and the second plate member 17b. By selectively fixing the fourth to seventh locking holes 36a, 36b, 36c, and 36d and inserting and fixing the fixing pin 43 into the second pin locking hole 44b and the third pin locking hole 44c, the cable A state where the insertion hole 27 is reduced and the vibrator cable 19 is sandwiched (see FIG. 4A), a state where the cable insertion hole 27 is enlarged and the vibrator cable 19 is loosely fitted (see FIG. 4B), or It is possible to hold the state where the fixed guide piece 18 is removed inside the tunnel lining form 10.

  That is, for example, the second pin locking hole 44b is made to match the sixth locking hole 36c of the second plate member 17b, and the third pin locking hole 44c is set to the third locking hole of the first plate member 17a. By inserting and fixing the fixing pin 43 into the second pin locking hole 44b and the third pin locking hole 44c in a state of being matched with the hole 32c and the seventh locking hole 36d of the second plate member 17b, It becomes possible to reduce the cable insertion hole 27 shown in FIG. 4A and maintain the state in which the vibrator cable 19 is sandwiched. Further, for example, the second pin locking hole 44b is matched with the sixth locking hole 36c of the second plate-like member 17b, and the third pin locking hole 44c is made to be the second locking of the first plate-like member 17a. By inserting and fixing the fixing pin 43 into the second pin locking hole 44b and the third pin locking hole 44c in a state of being matched with the hole 32b and the seventh locking hole 36d of the second plate member 17b, It is possible to maintain a state in which the vibrator cable 19 is loosely fitted by expanding the cable insertion hole 27 shown in FIG. Further, for example, the second pin locking hole 44b is matched with the fourth locking hole 36a of the second plate-like member 17b, and the third pin locking hole 44c is made to be the first locking of the first plate-like member 17a. By inserting and fixing the fixing pin 43 into the second pin locking hole 44b and the third pin locking hole 44c in a state of being matched with the hole 32a and the fifth locking hole 36b of the second plate member 17b, It is possible to hold the state where the fixed guide piece 18 shown in FIG. 4D is removed inside the tunnel lining form 10.

  In the present embodiment, a plurality of fixed guide pieces 18 are provided in series as a fixed installation interval a in the axial direction X of the tunnel, for example, at an interval of 1000 mm (see FIG. 3). Further, in this embodiment, as shown in FIG. 2, the rod-like vibrator 20 connected to the tip of the vibrator cable 19 and disposed in proximity to the existing lining concrete 15 is also a fixed guide piece 18 having the same configuration as described above. By supporting the both end portions using, the vibrator cable 19 is linearly arranged and temporarily fixed to the intermediate portion in the thickness direction of the lining space 23.

  The rod-shaped vibrator 20 is a known device that is widely used as a compacting device for concrete, and includes, for example, an electromagnetic vibrating body, a vibrating body that vibrates due to the rotational force of a motor, and the rear end of the rod-shaped vibrator 20. A vibrator cable 19 made of a flexible power supply hose that accommodates connection lines and the like is integrally connected to the portion.

  The vibrator cable 19 is, for example, a wire having a thickness of about 8 mm is covered with a polyamide tube having an inner diameter of about 9.2 mm and an outer diameter of about 12 mm, and conductors and intervening strings are alternately arranged in the circumferential direction on the outer peripheral surface of the polyamide tube. These are known cable members having an outer diameter of, for example, about 37.2 mm, which are formed by covering them with a sheath (outer skin) having an outer diameter of about 21.8 mm and then covering with a wear-resistant tube. The vibrator cable 19, which is embedded in the concrete 11 a filled in the lining space 23, resists the frictional force (adhesive force) with the concrete 11 a, together with the rod-shaped vibrator 20. It has a sufficient tensile strength to be pulled toward the frame 16 side.

  In the present embodiment, a vibrator is provided in the middle portion in the thickness direction by a plurality of fixed guide pieces 18 after the lining concrete 11 of the side wall portion and the arch-shaped portion of the tunnel 12 shown in FIG. For example, as shown in FIG. 1 (c), a concrete pump is applied to the lining space 23 of the crown portion (crown portion) 13 of the tunnel 12 in which the cable 19 and the rod-shaped vibrator 20 are linearly arranged and temporarily fixed. The concrete 11 a is placed through the concrete placement hole 24 by connecting to the placement hole 24.

  If the concrete 11a is cast until the entire lining space 23 is filled, or if the concrete 11a is cast until the rod-like vibrator 20 and the vibrator cable 19 are embedded in the concrete over a considerable length, for example, By sliding the first plate member 17a of each fixed guide piece 18 downward relative to the second plate member 17b, the rod-like vibrator 20 and the vibrator cable 19 can be freely fitted and moved. After that, the rod-like vibrator 20 and the vibrator cable 19 are, for example, a cord winding device while vibrating the rod-like vibrator 20 while additionally placing concrete appropriately from the concrete placing hole 24 and other placement holes as necessary. By pulling with the pulling force of 45, it is moved to the end form 16 side, and the concrete 11a placed in the crown portion 13 of the tunnel 12 is compacted. When the rod-like vibrator 20 moves to the end formwork 16, for example, the stick-like vibrator 20 is pulled out together with the vibrator cable 19 from the cable through hole of the end formwork 16, and the lining concrete in the span where the tunnel lining formwork 10 is installed. No. 11 placement work is completed.

  In the present embodiment, as shown in FIG. 2, for example, a wire member introduced into the lining space 23 from a wire introduction hole formed in the tunnel lining formwork 10 in the vicinity of the existing lining concrete 15, for example. 46 is connected to the tip of the rod-shaped vibrator 20 and a tensile force is applied to the existing lining concrete 15 side via the wire member 46, so that the linearity of the rod-shaped vibrator 20 and the vibrator cable 19 is more effectively maintained. In addition, the vibrator cable 19 can be pulled toward the end form 16 side. At this time, the wire member 46 introduced into the lining space 23 from the wire introduction hole passes through the wire guide hole of the wire guide piece 47 arranged in series with the fixed guide piece 18, thereby the lining space 23. After being guided to the middle portion in the thickness direction, it is preferable that the rod-like vibrator 20 is connected to the tip portion.

  And according to this embodiment, the linearity of the vibrator cable 19 at the time of compacting the concrete 11a poured into the lining space 23 is held via the fixed guide piece 18 having a loose fitting fixing function. The vibrator 20 and the vibrator cable 19 can be easily and smoothly moved toward the end form 16, and the aggregate is interposed between the fixed guide piece 18 and the rod-like vibrator 20 and the vibrator cable 19 during the movement. Even when clogged up and clogged, it is possible to eliminate the state in which the aggregate is clogged, and to continue the movement of the rod-like vibrator 20 and the vibrator cable 19 smoothly.

  That is, according to the present embodiment, the vibrator cable 19 has a thickness of the lining space 23 before pouring concrete into the lining space 23 by the fixed guide pieces 18 having a loose fitting fixing function arranged in series. In the middle portion in the vertical direction, the wire is linearly arranged in the axial direction X of the tunnel 12 and temporarily fixed (see FIG. 4A). Since the vibrator cable 19 is temporarily fixed in a straight line in this way, the vibrator cable 19 is temporarily fixed without being pushed away by the concrete even when concrete having a considerable specific gravity is poured into the lining space 23. Since it does not move or bend from the predetermined position, the rod-shaped vibrator 20 is moved to the end form frame 16 side while pulling the vibrator cable 19 while holding the linearly arranged state firmly. 4 (b), the rod-like vibrator 20 and the vibrator cable 19 can be easily and smoothly moved toward the end frame 16 side, thereby covering the crown portion 13 of the tunnel 12. The concrete 11a has been compacted efficiently and effectively, and has been compacted sufficiently. It is possible to up to obtain a good lining concrete 11a. In addition, according to the present embodiment, the deep notch recess 26b of the second plate member 17b is opened to the outer peripheral edge of the fixed guide piece 18 so that the vibrator cable 19 can be detached from the cable insertion hole 27. Since the peripheral opening mechanism 28 by the closing wire member 30 is provided, the rod-shaped vibrator 20 and the vibrator cable 19 are moved between the fixed guide piece 18 and the rod-shaped vibrator 20 and the vibrator cable 19 during the movement of the rod-shaped vibrator 20 and the vibrator cable 19 to the end frame 16 side. Even when the aggregate is jammed and clogged, the rod-like vibrator 20 and the vibrator cable 19 are connected to the cable by removing the closing wire member 30 from the second plate-like member 17b by an operation from the inside of the tunnel lining form 10. Detach from the insertion hole 27 (see FIG. 4 (c)) to eliminate the state where the aggregate is caught, It is possible to smoothly subsequent movement of the motor 20 and the vibrator cable 19.

  Furthermore, in this embodiment, if the deep notch recess 26b is opened to the outer peripheral edge of the fixed guide piece 18 by removing the closing wire member 30 from the second plate member 17b, the first plate member 17a and the first plate member 17a By pulling the two-plate-like member 17b into the tunnel lining formwork 10, the rod-like vibrator 20 and the vibrator cable 19 are more reliably secured from the shallow notch recess 26a and the deep notch recess 26b that form the cable insertion hole 27. Can be detached.

  FIGS. 8A to 8D illustrate other forms of the fixed guide piece 18 employed in the tunnel lining concrete placing structure of the present embodiment. That is, in the fixed guide piece 18 shown in FIGS. 8A to 8D, one plate-like member 17 a has a shallow inner sandwiching recessed portion 48 a facing outward in the thickness direction Y of the lining space 23. In addition, the other plate-like member 17b has a deep outer sandwiching recess 48b facing inward in the thickness direction Y, and this deep outer sandwiching recess 48b is a side edge of the other plate-like member 17b. Since the detachment opening 49 at the side edge of the deep outer sandwiching recess 48 b is used as the peripheral opening mechanism 28, the shallow inner sandwiching recess 48 a is used as the detachment opening 49. When pulled down downward, the deep outer sandwiching recess 48b is opened to the outer peripheral edge of the fixed guide piece 18 so that the rod-like vibrator 20 and vibrator cable 19 are detached from the cable insertion hole 27 (FIG. 8 (d Reference). Even with the fixed guide piece 18 having such a configuration, the aggregate is formed between the fixed guide piece 18 and the rod-like vibrator 20 or the vibrator cable 19 during the movement of the rod-like vibrator 20 and the vibrator cable 19 toward the end frame 16 side. Even when it is jammed and clogged, it is possible to eliminate the state in which the aggregate is jammed and to smoothly move the rod-like vibrator 20 and the vibrator cable 19 continuously.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the present invention can be employed to form lining concrete in other tunnels other than mountain tunnels. In addition, the inner peripheral surface of the tunnel that forms a lining space between the outer surface of the tunnel lining formwork is the inner periphery of the tunnel after the primary lining is performed in addition to the ground covered with sprayed concrete. It may be a lining surface for performing secondary lining by a surface. Furthermore, the lining concrete compacted according to the present invention is not necessarily the lining concrete of the tunnel crown. For example, a plurality of fixed guide pieces are attached to the tunnel side walls, shoulders, arch-shaped portions, etc. The present invention can also be applied by arranging them in series in the direction. Furthermore, the peripheral opening mechanism that opens the notch recess provided in the fixed guide piece to the outer peripheral edge of the fixed guide piece is provided with the outer peripheral edge of the fixed guide piece 18 other than the above-described closing wire member and detachment opening. Various other configurations having a function of opening can be employed.

(A)-(c) is a side view illustrating a part of the work procedure of laying concrete placing work using a tunnel lining concrete placing structure according to a preferred embodiment of the present invention, partly as a sectional view. FIG. It is a schematic sectional drawing explaining the structure of the tunnel lining concrete placement structure which concerns on preferable one Embodiment of this invention. It is a schematic perspective view explaining the structure of the tunnel lining concrete placement structure which concerns on preferable one Embodiment of this invention. (A) is a front view for explaining a state in which the vibrator cable is temporarily fixed by a fixed guide piece, (b) is a front view for explaining a state in which the vibrator cable is loosely fitted, and (c) is for removing the vibrator cable. The front view explaining a state is a front view explaining the state which removed the fixed guide piece inside the tunnel lining formwork. (A) is a front view of one plate-like member of the fixed guide piece, (b) is a front view of the other plate-like member, and (c) is a cross-sectional view taken along line AA of (b). It is a side view explaining the state which attached the fixed guide piece to the formwork for tunnel lining. It is a front view of a support hardware. (A) is a front view illustrating a state in which the vibrator cable is temporarily fixed by another type of fixed guide piece, (b) is a front view illustrating a state in which the vibrator cable is loosely fitted, and (c) is a diagram illustrating the vibrator cable. FIG. 6D is a front view illustrating a state in which the fixed guide piece of another form is removed inside the tunnel lining formwork. (A) is sectional drawing seen from the tunnel axial direction explaining the state which installed the formwork for tunnel lining along the inner peripheral surface of a tunnel, (b) is the same side view. (A)-(d) is a side view which shows the work procedure of the conventional tunnel lining concrete placement method, and shows one part as sectional drawing.

Explanation of symbols

10 tunnel lining form 11 lining concrete 11a crown lining concrete 12 tunnel 13 tunnel crown 15 existing lining concrete 16 wife formwork 17a first plate member (one plate member)
17b Second plate member (the other plate member)
18 Fixed guide piece 19 Vibrator cable 20 Bar-shaped vibrator 23 Covering space 26a Shallow notch recess 26b Deep notch recess 27 Cable notch hole 28 Peripheral opening mechanism 29 Notch tip part 30 Closure wire member 38 Handle fitting 39 Wire insert hole 42 Support Hardware 43 Fixing pin 48a Shallow inner sandwiching recess 48b Deep outer sandwiching recess 49 Detachment opening X Tunnel axial direction Y Covering space thickness direction

Claims (3)

A tunnel lining concrete placement structure used in a tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork,
A rod-shaped vibrator is inserted into the lining space between the outer peripheral surface of the tunnel lining formwork and the lining surface of the inner periphery of the tunnel, which is sandwiched between the already formed existing lining concrete and the end formwork. Arranged in close proximity to the concrete, and arranged in a state where it can be pulled from the outside of the wife mold frame by extending the vibrator cable subsequent to the wife mold frame side and penetrating the wife mold frame, After pouring concrete into the lining space, the rod-shaped vibrator can be compacted while moving to the end form frame side by pulling the vibrator cable,
Before pouring concrete into the lining space, the vibrator cable is placed in a straight line in the axial direction of the tunnel while being held in the middle portion in the thickness direction of the lining space, and the concrete is poured. After that, the fixed guide piece having the function of loosely fitting the vibrator cable, which allows the vibrator cable to be switched to the loosely fitted state and to be pulled to the end frame side while vibrating the rod-like vibrator, is a tunnel shaft. A plurality are arranged in series with intervals in the direction,
The fixed guide piece is composed of a pair of plate-like members protruding from the outer peripheral surface of the tunnel lining formwork so as to be able to advance and retreat in the thickness direction of the lining space, and the notch recesses of each plate-like member are overlapped. By combining, a cable insertion hole that can be expanded and contracted is formed,
By sliding relative to the other plate member, the cable insertion hole is contracted and temporarily fixed in a state in which the vibrator cable is sandwiched, and the cable insertion hole is expanded to enlarge the vibrator. Set the cable loosely,
The fixed guide piece has a peripheral opening that allows at least one notch recess of the pair of plate-like members to be opened to the outer peripheral edge of the fixed guide piece so that the vibrator cable can be detached from the cable insertion hole. Tunnel lining concrete placement structure characterized by comprising a mechanism.   One plate-like member of the pair of plate-like members constituting the fixed guide piece has a shallow cutout concave portion facing outward in the thickness direction of the lining space, and the other plate-like member is The closing wire member that has a deep notch recess facing outward in the thickness direction of the lining space and closes the notch tip of the deep notch recess can be removed by operation from inside the tunnel The deep notch recess is opened to the outer peripheral edge of the fixed guide piece by removing the closing wire member provided at the front end of the notch from the notch front end as a peripheral opening mechanism. Item 2. The tunnel lining concrete placing structure according to item 1.   One plate-like member of the pair of plate-like members constituting the fixed guide piece has a shallow inner sandwiching concave portion facing outward in the thickness direction of the lining space, and the other plate-like member is A deep outer sandwiching recess facing inward in the thickness direction, and the deep outer sandwiching recess opens at a side edge of the other plate-like member, thereby providing the deep outer sandwiching recess. The opening of the side edge of the recessed recess is used as a peripheral opening mechanism, and the shallow inner sandwiched recess is pulled down below the opening to open the deep outer sandwiched recess to the outer peripheral edge of the fixed guide piece. The tunnel lining concrete placement structure according to 1.

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