JP2008082046A - Tunnel lining concrete placing method and tunnel lining concrete placing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly move a bar vibrator and a vibrator cable to an end mold flask side by holding the linearity of the vibrator cable when concrete poured into a lining space is compacted. <P>SOLUTION: In this tunnel lining concrete placing method for forming the lining concrete 11 by using a mold flask 10 for tunnel lining, a bar vibrator 10 is disposed in proximity to existing lining concrete 15. The vibrator cable 19 is extended through an end mold flask 16. A wire member 18 inserted into a lining space 23 through a wire insertion hole 17 formed at the mold flask 10 between the existing lining concrete 15 and the bar vibrator 20 is connected to the tip of the bar vibrator 20. Tension is applied to the existing lining concrete 15 through the wire member 18. Since the vibrator cable 19 is towed to the end mold flask 16 side while holding the linearity of the vibrator cable 19, the concrete can be compacted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tunnel lining concrete placing method for forming lining concrete using a tunnel lining formwork, and a tunnel lining concrete placing structure used for the lining concrete placing method.

  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. 8 (a) and 8 (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. 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 lay 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. 8) 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. (Refer to FIG. 9A) and a step of compacting using the vibrator 58 while pouring the concrete 57 through the middle inspection window 56 toward the upper arch-shaped portion 52 of the side wall 55 (FIG. 9 ( 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. Step (see FIG. 9 (c)) and the concrete sequentially from the portion on the existing lining concrete 62 side of the crown portion 59 through the concrete placement hole 60. Pouring 7, by the step of filling the concrete up wife formwork 63 without compaction using direct vibrator (see FIG. 9 (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 for enabling compaction of concrete placed in a tunnel crown is disclosed (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, the guide rail is also provided as a setup line for 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 are provided on the outer peripheral surface of the tunnel lining formwork, arranged in series at intervals in the axial direction of the tunnel. It is conceivable to move the rod-like vibrator while pulling from the existing side toward the end form frame side by inserting and guiding the vibrator cable following the rod-like vibrator through the insertion hole.

  However, in the method of moving the rod-like vibrator by pulling the vibrator cable from the end mold frame side while guiding the vibrator cable by the guide piece having the insertion hole, for example, the outer periphery of the tunnel lining formwork before placing concrete When the concrete is compacted, the vibrator cable, which is set in a straight line in the lining space, moves when the concrete with a considerable specific gravity is poured into the lining space and bends or bends. The linearity is lost and a large resistance is generated during towing, and it is difficult to move the rod-shaped vibrator and vibrator cable toward the end frame side by rubbing or catching with the cable insertion hole of the guide piece. The cable may be damaged or broken.

  The present invention has been made paying attention to such a problem, and maintains the linearity of the vibrator cable when the concrete poured into the lining space is compacted. An object of the present invention is to provide a tunnel lining concrete placing method and a tunnel lining concrete placing structure capable of easily and smoothly moving to the side.

  The present invention provides a tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork, and the tunnel lining concrete is sandwiched between the existing lining concrete and the end formwork. In the lining space between the outer peripheral surface of the formwork and the lining surface of the inner periphery of the tunnel, a rod-like vibrator is arranged close to the existing lining concrete, and the vibrator cable following this is placed on the side of the end formwork It is arranged in a state where it can be pulled from the outside of the wife form by extending and extending the wife form, and after pouring concrete into the lining space, the vibrator cable is vibrated while vibrating the rod-like vibrator. A concrete placement method for compacting concrete while moving to the end form side by towing, wherein the existing lining concrete and A wire member introduced into the lining space from a wire introduction hole formed in the tunnel lining mold between the rod-like vibrator is connected to a tip portion of the rod-like vibrator, and the existing covering is connected via the wire member. By providing a tunnel lining concrete placing method for pulling the vibrator cable to the end frame side while maintaining the linearity of the vibrator cable by applying a tensile force to the concrete side, the above object is achieved. Achieved.

  And in the tunnel lining concrete placing method of the present invention, the vibrator cable is projected on the outer peripheral surface of the tunnel lining formwork, and a plurality of vibrator cables are arranged in series at intervals in the axial direction of the tunnel. It is preferable that the cable guide piece is guided in the axial direction of the tunnel by being inserted into the cable insertion hole of the cable guide piece and pulled toward the end form frame side.

  Further, in the tunnel lining concrete placing method of the present invention, the wire member introduced into the lining space from the wire introduction hole is a wire guide piece arranged in series with the cable guide piece. It is preferable that the rod-shaped vibrator is connected to the tip of the rod-shaped vibrator through a wire guide hole arranged at a center height position matching the insertion hole.

  Furthermore, in the tunnel lining concrete placement method of the present invention, when the traction force for towing the vibrator cable excessively increases due to the biting of aggregates, the wire member is pulled to the existing lining concrete side, It is preferable that the vibrator cable and the vibrator cable are once pulled back to the existing lining concrete side, and then the vibrator cable is pulled again to the end form frame side.

  Furthermore, in the tunnel lining concrete placing method of the present invention, it is preferable that the lining space is a lining space at the tunnel crown.

  Further, the present invention provides a tunnel lining concrete placement structure used in the above-described tunnel lining concrete placement method, wherein the tunnel lining mold is sandwiched between the already formed existing lining concrete and the end frame. In the wrapping space between the outer peripheral surface of the frame and the lining surface of the inner periphery of the tunnel, it is projected on the outer peripheral surface of the tunnel lining formwork, and is arranged in series at intervals in the axial direction of the tunnel A plurality of cable guide pieces each having a cable insertion hole; a rod-like vibrator disposed in proximity to the existing lining concrete; and extending to the end form frame side following the rod-like vibrator; A vibrator cable that is inserted through a cable insertion hole and is disposed so as to pass through the wife mold frame, and the vibrator cable that is provided outside the wife mold frame is connected to the wife mold. Cable pulling means for pulling to the side, a wire introduction hole formed in the tunnel lining formwork between the existing lining concrete and the rod-like vibrator, and introduced into the lining space to the tip of the rod-like vibrator The above-mentioned object is achieved by providing a tunnel lining concrete placing structure comprising a wire member coupled to the wire and a wire tension means for pulling the wire member toward the existing lining concrete.

  And in the tunnel lining concrete placement structure of the present invention, the wire guide piece arranged in series with the cable guide piece in the lining space between the wire introduction hole and the rod-like vibrator is a wire guide hole. Is arranged at the center height position matching the cable insertion hole and protrudes from the outer peripheral surface of the tunnel lining formwork, and the wire member introduced into the lining space includes the wire guide hole. It is preferable that it is connected to the front-end | tip part of the said rod-shaped vibrator via.

  According to the tunnel lining concrete placement method or the tunnel lining concrete placement structure of the present invention, the linearity of the vibrator cable when the concrete poured into the lining space is compacted, and the rod-like vibrator and the vibrator cable are maintained. Can be moved easily and smoothly to the side of the wife formwork.

  As shown in FIGS. 1A to 1C, a tunnel lining concrete placing method according to a preferred embodiment of the present invention is for tunnel lining as a concrete lining formwork, for example, in a mountain tunnel construction method. When forming the lining concrete 11 on the side and the upper part of the tunnel 12 using the mold 10, in particular, the lining concrete 11a of the crown (crown) 13 of the tunnel 12 is placed below this. For example, it is employed as a method 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 and upper part of the tunnel 12 while re-installing from the rear to the front of the tunnel 12 in the excavation direction (axial direction) X. is there. 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.

  And the tunnel lining concrete placement method of this embodiment is a tunnel lining concrete placement method in which the lining concrete 11 is formed using the tunnel lining form 10, as shown in FIGS. The tunnel crown portion 13 between the outer peripheral surface of the tunnel lining mold 10 and the lining surface 22 of the inner periphery of the tunnel, which is sandwiched between the end surface 15a of the existing lining concrete 15 and the end frame 16, is formed. In the lining space 23, the rod-shaped vibrator 20 is disposed in the vicinity of the existing lining concrete 15, and the vibrator cable 19 subsequent thereto is extended to the end form frame 16 side to penetrate the end form frame 16. It is arranged in a state where it can be pulled from the outside of the wife formwork 16, and after pouring concrete into the lining space 23, the vibrator case is vibrated while vibrating the vibrator 20. A concrete placement method in which concrete 11a is compacted while being moved toward the end form frame 16 by pulling of a cable 19, and a tunnel lining die between an end surface 15a of an existing lining concrete 15 and a rod-like vibrator 20 is provided. The wire member 18 introduced into the lining space 23 from the wire introduction hole 17 formed in the frame 10 is connected to the tip portion of the rod-like vibrator 20, and a tensile force is applied to the existing lining concrete 15 side via the wire member 18. Thus, the vibrator cable 19 is pulled toward the end form frame 16 side while maintaining the linearity of the vibrator cable 19.

  Further, in this embodiment, the vibrator cable 19 protrudes from the outer peripheral surface of the tunnel lining form 10 and a plurality of cable guide pieces 21 arranged in series at intervals in the axial direction X of the tunnel 12. By being inserted through the cable insertion hole 25, the cable is guided in the axial direction X of the tunnel 12 and pulled toward the end form 16.

  Furthermore, in this embodiment, the wire member 18 introduced into the lining space 23 from the wire introduction hole 17 is centered with the cable insertion hole 25 of the wire guide piece 26 arranged in series with the cable guide piece 21. It is connected to the tip of the rod-like vibrator 20 through the wire guide hole 27 arranged at the height position.

  According to this embodiment, as means for carrying out the above-described tunnel lining concrete placing method, as shown in FIGS. 2 to 4, the end surface 15 a of the existing lining concrete 15 and the end formwork are formed. 16 in the wrapping space 23 between the outer peripheral surface of the tunnel lining mold 10 and the lining surface 22 of the inner periphery of the tunnel, and is projected from the outer peripheral surface of the tunnel lining mold 10, A plurality of cable guide pieces 21 having cable insertion holes 25 arranged in series at intervals in the axial direction X of the tunnel 12, a rod-shaped vibrator 20 disposed close to the existing lining concrete 15, and a rod-shaped vibrator Vibrator cable 1 that extends to the end form 16 after 20 and is inserted into the cable insertion hole 25 of the cable guide piece 21 and is disposed through the end form 16. Between the first cord winding device 28 provided on the outside of the end form 16 and serving as a cable pulling means for pulling the vibrator cable 19 toward the end form 16, and between the existing lining concrete 15 and the rod-like vibrator 20. The wire member 18 introduced into the lining space 23 from the wire introduction hole 17 formed in the tunnel lining form 10 and connected to the tip of the rod-like vibrator 20, and the wire member 18 on the existing lining concrete 15 side A tunnel lining concrete placing structure constituted by the second cord winding device 29 as a wire pulling means for pulling is used. In addition, as a wire pulling means, it may be based on human power.

  Moreover, in the tunnel lining concrete placement structure of the present embodiment, the wire guide piece 26 arranged in series with the cable guide piece 21 in the lining space 23 between the wire introduction hole 17 and the rod-like vibrator 20 is provided. The wire guide hole 27 is disposed at the center height position matching the cable insertion hole 25 and protrudes from the outer peripheral surface of the tunnel lining form 10, and the wire member 18 introduced into the lining space 23 is It is connected to the tip of the rod-like vibrator 20 through the wire guide hole 27.

  In this embodiment, for example, the rod-like vibrator 20 for compacting the concrete 11a poured into the concrete lining space 23 through the concrete placing hole 24 is, for example, an electromagnetic vibrator or a vibrator that vibrates due to the rotational force of a motor. Is a known device that is widely used as a compacting device for concrete, and a vibrator cable comprising a flexible power supply hose in which a connecting line or the like is accommodated at the rear end portion of the rod-like vibrator 20. 19 are connected together.

  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 is inserted into the concrete 11a poured into the lining space 23 and filled, and the vibrator cable 19 resists the frictional force (adhesive force) with the concrete 11a. At the same time, it has sufficient tensile strength to be pulled toward the end form 16 side.

  These rod-shaped vibrator 20 and vibrator cable 19 are projected on the outer peripheral surface of the tunnel lining form 10 before the concrete 11a is poured into the lining space 23 of the tunnel crown 13, and the shaft of the tunnel 12 is provided. In the axial direction X of the tunnel 12 while being held in the middle portion in the thickness direction of the lining space 23 by a plurality of cable guide pieces 21 arranged in series at a predetermined interval a of about 1000 mm in the direction X, for example. It is placed in a straight line and temporarily fixed.

  Here, as shown in FIGS. 5A and 5B and FIGS. 6A and 6B, each cable guide piece 21 extends from the outer peripheral surface of the tunnel lining form 10 to the lining space 23. It consists of a pair of plate-like members 21a and 21b that overlap in the axial direction X of the tunnel 12 and protrude so as to be able to advance and retreat in the thickness direction Y. One plate-like member (first plate-like member) 21a is outside in the thickness direction. And the other plate-like member (second plate-like member) 21b has an outer sandwiching recess 30b facing inward in the thickness direction, and the inner sandwiching recess 30b. A portion between 30a and the outer sandwiching recess 30b serves as a cable insertion hole 25 through which the vibrator cable 19 and the rod-shaped vibrator 20 are loosely inserted so as to be temporarily fixed.

  That is, the cable guide piece 21 relatively moves the pair of plate-like members 21a and 21b toward the side where the inner sandwiching recess 30a and the outer sandwiching recess 30b approach each other, and sandwiches between them, thereby the vibrator cable 19 and the rod-like vibrator. 20 is temporarily fixed, and the pair of plate-like members 21a and 21b are moved relative to the side where the inner sandwiching recess 30a and the outer sandwiching recess 30b are separated from each other to release the temporarily fixed state. The vibrator 20 can be loosely fitted and moved in the axial direction X of the tunnel 12 using the cable insertion hole 25 as a guide.

  The pair of plate-like members 21 a and 21 b of the cable guide piece 21 are made of, for example, a steel plate having a substantially vertically long rectangular shape, and are arranged on both sides of each cable guide piece 21 below the lining space 23. By being slidably supported by the support plate 31 that is integrally attached to the tunnel lining mold 10, it is possible to advance and retreat in the thickness direction Y of the lining space 23 from the outer peripheral surface of the tunnel lining mold 10. Can be protruded. As shown in FIG. 5 (b), the support plate 31 is disposed on both sides in the width direction across the pair of plate-like members 21a and 21b so as to be perpendicular to the plate-like members 21a and 21b. It is fixed to the mold 10. Further, as shown in FIG. 5A, first and second slide guide grooves 32 a and second slide guides that are vertically cut along the thickness direction Y of the lining space 23 are formed in each of the support plates 31 on both sides. The groove 32b is formed in parallel with a considerable length.

  The slide guide pin 33a projecting from the side end surface of the first plate member 21a is placed in the first slide guide groove 32a, and the slide guide pin 33b projecting from the side end surface of the second plate member 21b is placed in the second slide guide groove 32b. And the first plate member 21a and the second plate member 21b are moved forward and backward in the thickness direction Y of the lining space 23 by, for example, an operation of grasping the handle pieces 34a and 34b. These plate-like members 21 a and 21 b are projected into the covering space 23 through the insertion openings 35 of the cable guide pieces 21 formed in the work form 10. In addition, by this, the first plate-like member 21a and the second plate-like member 21b from the state in which the cable insertion hole 25 by the inner sandwiching recess 30a and the outer sandwiching recess 30b is disposed in the middle portion in the thickness direction of the covering space 23. The thickness of the lining space 23 in a state where the pair of plate-like members 21a and 21b is stabilized while adjusting the amount of protrusion until the inside of the tunnel lining form 10 is pulled out and removed from the lining space 23. It can be slid forward and backward in the direction Y.

  Moreover, in this embodiment, as shown to FIG.4 and FIG.5 (a), it is on the 2nd plate-shaped member 21b side of the pair of plate-shaped members 21a and 21b piled up in the axial direction X of the tunnel 12. Further, the positioning and holding plates 36 are arranged so as to be overlapped with each other, and are attached to the tunnel covering formwork 10 integrally with the support plates 31 on both sides below the covering space 23. The positioning holding plate 36 is formed with a third fixing pin locking hole 37, which is formed in the first fixing pin locking hole 38a formed in the first plate member 21a or the second plate member 21b. The vibrator cable 19 and the rod-shaped vibrator 20 are temporarily fixed by inserting and locking the fixed pin 39 in alignment with the formed second fixed pin locking hole 38b, or the vibrator cable 19 and the rod-shaped vibrator 20 are loosely moved. The enabled state can be firmly held.

  Furthermore, in the present embodiment, preferably, a protective sleeve 40 is attached so as to cover the outer peripheral surface of the vibrator cable 19 at a position corresponding to the cable guide piece 21 in a state where the vibrator cable 19 is temporarily fixed (FIG. 2). FIG. 3). Since the protective sleeve 40 is mounted at a position corresponding to the cable guide piece 21, the vibrator cable 19 is prevented from being damaged by the gripping force by the pair of plate-like members 21a and 21b of the cable guide piece 21 when temporarily fixed. Will be effectively protected.

  Furthermore, in this embodiment, the buffer material 41 is attached to both end portions of the rod-like vibrator 20 (see FIG. 4). Since the buffer material 41 is mounted, the rod-like vibrator 20 is removed from the lining space 23 through the cable through hole of the end form frame 16 in order to remove the rod-like vibrator 20 from the lining space 23 after the concrete 11a is compacted. Even if the extracted bar-shaped vibrator 20 collides with surrounding equipment or the like in the tunnel 12 when it is extracted from, the impact can be effectively mitigated.

  And in this embodiment, as shown in FIGS. 2-4, the wire member 18 which is connected to the front-end | tip part of the rod-shaped vibrator 20 and applies a tensile force to the existing lining concrete 15 side is the existing lining concrete 15 This is provided by being introduced into the lining space 23 from a wire introduction hole 17 formed in the tunnel lining mold 10 between the end face 15 a of the rod-like vibrator 20. The wire member 18 is made of, for example, a wire or a steel wire having a thickness of about 6 to 8 mm. For example, the wire member 18 provided inside the tunnel 12 by the existing lining concrete 15 pulls the wire member 18 toward the existing lining concrete 15 side. The wire guide hole of the wire guide piece 26 which is wound around the two-code winding device 29 so as to be pulled, and is inserted at one end of the two-code winding device 29 into the wire introduction hole 17 and then at the center height position matching the cable insertion hole 25 27, the rod-like vibrator 20 is connected to the tip end portion of the rod-like vibrator 20 via, for example, a connecting fitting 49.

  As shown in FIG. 4 and FIGS. 7A and 7B, the wire guide piece 26 protrudes from the outer peripheral surface of the tunnel lining form 10 so as to be able to advance and retreat in the thickness direction Y of the lining space 23. For example, it consists of a single plate-like member 26a made of a steel plate having a substantially vertically long rectangular shape, and a wire guide hole 27 is formed through substantially the center of the upper half of the plate-like member 26a. In the present embodiment, the wire guide hole 27 is a circular opening hole having a hole diameter of, for example, about 15 to 25 mm, and the portion below the top is a tapered surface 27a. The size of the wire member 18 is reduced toward the end form 16 so that the wire member 18 can be easily inserted from the existing concrete 15 side.

  Moreover, the wire guide piece 26 is arrange | positioned at the both sides which pinched | interposed the wire guide piece 26, for example in the downward direction of the lining space 23, and is slidably supported by the support plate 42 attached to the tunnel lining formwork 10 integrally. As a result, the tunnel lining form 10 can protrude in the thickness direction Y of the lining space 23 so as to advance and retract. As shown in FIG. 7B, the support plate 42 is arranged perpendicular to the wire guide piece 26 on both sides in the width direction across the wire guide piece 26 and is fixed to the tunnel lining formwork 10. Further, as shown in FIG. 7 (a), the third slide guide grooves 43 cut in a longitudinal direction along the thickness direction Y of the lining space 23 are provided on each of the support plates 42 on both sides. Is formed.

  The slide guide pin 44 projecting from the side end surface of the plate-like member 26a constituting the wire guide piece 26 is engaged with the third slide guide groove 43, and the plate-like member 26a is operated by gripping the handle piece 45, for example. The plate-like member 26a is protruded into the lining space 23 through the insertion opening 46 of the wire guide piece 26 formed in the tunnel lining mold 10 by moving back and forth in the thickness direction Y of the lining space 23. Can be done. Moreover, by this, the wire guide hole 27 is arrange | positioned in the thickness direction intermediate part of the lining space 23, and the center height position of this is matched with the cable insertion hole 25 of the cable guide piece 21 in the protruding state. The thickness of the lining space 23 in a stable state while adjusting the protruding amount until the plate-like member 26a is pulled out of the tunnel lining form 10 and removed from the lining space 23. It can be moved forward and backward in the vertical direction Y.

  Furthermore, in this embodiment, as shown in FIG. 4 and FIG. 7A, the positioning and holding plate 47 is disposed so as to overlap the plate-like member 26 a constituting the wire guide piece 26, and the lining space 23. Are attached to the tunnel lining form 10 as a single unit with both sides sandwiched by the support plate 42. The positioning holding plate 47 is formed with a fourth fixing pin locking hole 47a, which is inserted into and locked with the fifth fixing pin locking hole 47b formed in the plate-like member 26a. By doing so, the state where the center height position of the wire guide hole 27 of the wire guide piece 26 is matched with the cable insertion hole 25 of the cable guide piece 21 can be firmly held.

  In the present embodiment, a vibrator is provided in the middle portion in the thickness direction by a plurality of cable guide pieces 21 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 of the crown portion 13 of the tunnel 12 is placed through the concrete placement hole 24 by connecting to the construction 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-like member 21a of each fixed guide piece 21 downward relative to the second plate-like member 21b, 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, wound with the first cord while the rod-like vibrator 20 is vibrated while appropriately placing concrete from the concrete placing hole 24 and other placement openings as necessary. It is pulled by the pulling force of the take-off device 28. Further, the rod-like vibrator 20 and the vibrator cable 19 are loaded with a pulling force applied to the existing lining concrete 15 via the wire member 18 by a traction force smaller than that of the first cord winding device 28 of the second cord winding device 29. 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.

  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 maintained, and the rod-like vibrator 20 and the vibrator cable 19 are directed to the end form 16 side. The movement can be performed easily and smoothly. That is, according to the present embodiment, the wire member 18 introduced into the lining space 23 from the wire introduction hole 17 is connected to the distal end portion of the rod-like vibrator 20 and pulled to the existing lining concrete 15 side via the wire member 18. Since the rod-like vibrator 20 and the vibrator cable 19 are pulled toward the end form 16 while applying a force, the stick-like vibrator 20 and the vibrator cable 19 are smoothly moved toward the end form 16 while maintaining their linearity. The concrete 11a poured into the lining space 23 can be effectively compacted. As a result, it is possible to efficiently and effectively compact the lining concrete 11a of the crown portion 13 of the tunnel 12 and obtain a lining concrete 11a that is sufficiently compacted and has a good quality and a good surface finish. become.

  Further, according to the present embodiment, the wire member 18 introduced into the lining space 23 from the wire introduction hole 17 matches the cable insertion hole 25 of the wire guide piece 26 arranged in series with the cable guide piece 21. Since it is connected to the tip portion of the rod-like vibrator 20 through the wire guide hole 27 arranged at the center height position, the straight line of the rod-like vibrator 20 and the vibrator cable 19 arranged in the middle portion in the thickness direction of the lining space 23. While maintaining the properties in a more stable state, the concrete 11a poured into the lining space 23 can be more effectively compacted by moving them smoothly toward the end frame 16 side.

  Furthermore, according to the present embodiment, the vibrator cable 19 has a thickness of the lining space 23 before the concrete is poured into the lining space 23 by the cable guide pieces 21 having a loose fitting and fixing function arranged in series. In the middle portion in the vertical direction, the wire 12 is linearly arranged in the axial direction X of the tunnel 12 and temporarily fixed. By virtue of the vibrator cable 19 being temporarily fixed in a straight line in this way, the vibrator cable 19 is not pushed away by the poured 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 temporarily fixed predetermined position, the rod-shaped vibrator 20 is moved to the end form frame 16 side while pulling the vibrator cable 19 while firmly holding the linearly arranged state. Thus, when the concrete is compacted, the rod-like vibrator 20 and the vibrator cable 19 can be moved more easily and smoothly to the end form frame 16 side.

  Furthermore, according to the present embodiment, the second cord winder 29 can load the rod-like vibrator 20 and the vibrator cable 19 via the wire member 18 with a tensile force and a traction force toward the existing lining concrete 15 side. It has become. Therefore, for example, when the rod-shaped vibrator 20 and the vibrator cable 19 are moved to the end form frame 16 side, the aggregate in the concrete is caught in the cable insertion hole 25 of the cable guide piece 21, so that the pulling to the end form frame 16 is performed. Even when the pulling force for pulling the vibrator cable 19 to the end frame 16 is excessively increased, the wire member 18 is pulled to the existing lining concrete side 15 by the second cord winding device 29 to form a rod shape. After the vibrator 20 and the vibrator cable 19 are once pulled back to the existing lining concrete 15 side, the vibrator cable 19 is pulled again to the end frame 16 side, thereby easily releasing the above-described aggregate biting. So that the rod-like vibrator 20 and vibrator cable 19 while moving to the wife mold 16 side, it is possible to concrete Yuku and compacted.

  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 does not necessarily need to be the lining concrete of the tunnel crown. For example, in the lining space such as the side wall of the tunnel, the shoulder, and the arched portion, the tip of the rod vibrator It is also possible to apply the present invention by providing the tunnel lining concrete placing structure of the present invention in which the wire member is connected.

(A)-(c) is the abbreviation which shows the work procedure of the laying concrete placement work including the tunnel lining concrete placement method concerning one desirable embodiment of the present invention, and shows a part as a sectional view It is a side view. 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. It is principal part schematic sectional drawing explaining the structure of the tunnel lining concrete placement structure which concerns on preferable one Embodiment of this invention. (A) is a schematic side view explaining the structure of a cable guide piece, (b) is a schematic front view. (A) is a front view of the 1st plate-shaped member of a cable guide piece, (b) is a front view of a 2nd plate-shaped member. (A) is a schematic side view explaining the structure of a wire guide piece, (b) is a schematic front view. (A) is the schematic sectional drawing seen from the tunnel axial direction explaining the state which installed the tunnel lining formwork along the inner peripheral surface of the tunnel, (b) is the simplified schematic side view. (A)-(d) is the schematic 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 formwork (concrete lining formwork)
DESCRIPTION OF SYMBOLS 11 Covering concrete 11a Crown covering concrete 12 Tunnel 13 Tunnel crown 15 Existing covering concrete 16 End form 17 Wire introduction hole 18 Wire member 19 Vibrator cable 20 Rod vibrator 21 Cable guide piece 22 Covering surface 23 Covering Space 25 Cable insertion hole 26 Wire guide piece 27 Wire guide hole 28 First cord winding device (cable pulling means)
29 Second cord winding device (wire pulling means)
X Axial direction of tunnel Y Thickness direction of lining space

Claims (7)

In the tunnel lining concrete placement method of 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, a concrete placement method for compacting concrete while moving the bar-shaped vibrator to the end form frame side by pulling the vibrator cable,
A wire member introduced into the lining space from a wire introduction hole formed in the tunnel lining formwork between the existing lining concrete and the rod-shaped vibrator is connected to a tip portion of the rod-shaped vibrator, and the wire member A tunnel lining concrete placement method for pulling the vibrator cable toward the end form frame side while maintaining the linearity of the vibrator cable by applying a tensile force to the existing lining concrete side via a cable.   The vibrator cable protrudes from the outer peripheral surface of the tunnel lining formwork and is inserted into cable insertion holes of a plurality of cable guide pieces arranged in series at intervals in the axial direction of the tunnel. The tunnel lining concrete placing method according to claim 1, wherein the tunnel lining concrete is guided in the axial direction of the tunnel and pulled toward the end formwork side.   The wire member introduced into the lining space from the wire introduction hole is a wire arranged at a center height position matching the cable insertion hole of the wire guide piece arranged in series with the cable guide piece. The tunnel lining concrete placement method according to claim 2, wherein the tunnel lining concrete is connected to a tip portion of the rod-like vibrator through a guide hole.   When the pulling force for pulling the vibrator cable is excessively increased, the wire member is pulled to the existing lining concrete side, and the rod-like vibrator and the vibrator cable are once pulled back to the existing lining concrete side, The tunnel lining concrete placement method according to any one of claims 1 to 3, wherein the vibrator cable is pulled again toward the end formwork side.   The tunnel lining concrete placement method according to any one of claims 1 to 4, wherein the lining space is a lining space of a tunnel crown. A tunnel lining concrete placement structure used in the tunnel lining concrete placement method according to any one of claims 1 to 5,
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 between the already formed existing lining concrete and the end formwork, the tunnel lining formwork A plurality of cable guide pieces projecting on the outer peripheral surface and having cable insertion holes arranged in series at intervals in the axial direction of the tunnel, and a rod-like vibrator arranged close to the existing lining concrete A vibrator cable extending to the end form frame side following the rod-like vibrator, inserted through a cable insertion hole of the cable guide piece and disposed through the end form frame, and the end form frame Cable pulling means for pulling the vibrator cable toward the end frame side, and the tunnel cover between the existing lining concrete and the rod-shaped vibrator A wire member introduced into the lining space through a wire introduction hole formed in the formwork and connected to the tip of the rod-like vibrator, and a wire pulling means for pulling the wire member toward the existing lining concrete side. Tunnel lining concrete placement structure.   In the lining space between the wire introduction hole and the rod-like vibrator, the wire guide piece arranged in series with the cable guide piece is arranged at a center height position that matches the cable insertion hole. The wire member introduced into the outer cover surface of the tunnel lining form is connected to the tip of the rod-like vibrator through the wire guide hole. 6. Tunnel lining concrete placing structure according to 6.

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