JP4557946B2 - Tunnel lining concrete placement method and placement structure - Google Patents

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. 10 (a) and 10 (b), the tunnel lining mold 50 is formed on the side wall of the tunnel 53 along the inner peripheral surface 54 of the tunnel 53 having 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 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 the 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. 10) region of the tunnel 53 is referred to as the 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. 11A) and 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 top of the side wall 55 (FIG. 11 ( 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. 11 (c)) and the concrete from the existing lining concrete 62 side portion 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. 11 (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.

  However, 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 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. If the rod-like vibrator or vibrator cable moves or bends, the straightness is lost when the poured concrete is compacted, and a large resistance is generated during towing, and the guide piece is rubbed or caught by the insertion hole. It becomes difficult to pull out the rod-like vibrator, and sometimes the vibrator cable is 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 end form by extending and extending the end form, and after pouring concrete into the lining space, the rod-like vibrator is pulled by pulling the vibrator cable. A concrete placement method in which concrete is compacted while being moved to the end formwork side, and projects from the outer peripheral surface of the tunnel lining formwork. , A plurality of fixed guide pieces having a loose fitting fixing function of the vibrator cable are arranged in series at intervals in the axial direction of the tunnel, and before pouring concrete into the lining space, the fixed guide pieces are Hold the vibrator cable in the middle of the lining space in the thickness direction and place it linearly in the axial direction of the tunnel and temporarily fix it. After pouring concrete, switch the vibrator cable to the loose fit state. Thus, the above object is achieved by providing a tunnel lining concrete placing method that pulls the rod-shaped vibrator to the end form frame side while vibrating.

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

  Further, the present invention is a tunnel lining concrete placement structure used in the above-described tunnel lining concrete placement method, wherein the vibrator cable is loosely fitted and fixed by protruding from an outer peripheral surface of the tunnel lining formwork. A plurality of fixed guide pieces having a function are arranged in series at intervals in the axial direction of the tunnel, and before pouring concrete into the lining space, the vibrator cable is connected to the lining space by the fixed guide pieces. It is arranged in a straight line in the axial direction of the tunnel while being held in the middle part in the thickness direction of the tunnel and temporarily fixed.After pouring concrete, the vibrator cable is switched to a loosely fitted state, and the rod-like vibrator is The fixed guide piece is constructed by pulling toward the end form mold side while being vibrated. It consists of a pair of plate-like members arranged so as to be able to move forward and backward in the thickness direction between them, and one plate-like member has an inner sandwiching recess facing outward in the thickness direction. The other plate-shaped member has an outer sandwiching recess facing inward in the thickness direction, and the pair of plate-like members are relatively moved toward the side closer to the inner sandwiching recess and the outer sandwiching recess. Then, the vibrator cable is temporarily fixed by being sandwiched between them, and the pair of plate-like members are relatively moved to the side where the inner sandwiched recess and the outer sandwiched recess are separated to release the temporarily fixed state. Thus, the above object is achieved by providing a tunnel lining concrete placing structure that enables the vibrator cable to be freely fitted and moved.

  In the tunnel lining concrete placing structure of the present invention, a protective sleeve is attached to cover the outer peripheral surface of the vibrator cable at a position corresponding to the fixed guide piece in a state where the vibrator cable is temporarily fixed. preferable.

  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 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.

  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. After the concrete is poured into the lining space 23, the rod-like vibrator 20 is inserted into the vibrator cable 19. Is a concrete placement method in which concrete is compacted while being moved to the end form 16 side, and has a function of loosely fitting and fixing the vibrator cable 19 by projecting from the outer peripheral surface of the tunnel lining form 10. A plurality of fixed guide pieces 18 are arranged in series at intervals in the axial direction X of the tunnel 12. Before the concrete is poured into the lining space 23, the vibrator cable 19 is held by the fixed guide piece 18 in the middle of the lining space 23 in the thickness direction and linearly arranged in the axial direction X of the tunnel 12. After fixing and pouring concrete, the vibrator cable 19 is switched to the loosely fitted state, and the rod-shaped vibrator 20 is pulled to the end form 16 side while vibrating.

  Moreover, according to this embodiment, as a means for implementing the above-mentioned tunnel lining concrete placement method, as shown in FIGS. Then, a plurality of fixed guide pieces 18 having a loose fitting fixing function of the vibrator cable 19 are arranged in series at intervals in the axial direction X of the tunnel 12, and these are fixed before pouring concrete into the lining space 23. After the vibrator piece 19 is linearly arranged and temporarily fixed in the axial direction X of the tunnel 12 while holding the vibrator cable 19 in the thickness direction intermediate portion of the lining space 23 by the guide piece 18, after pouring concrete, Tunnel lining concrete constructed by switching to a state in which the vibrator cable 19 is loosely fitted and pulling the vibrator 20 to the end form 16 side while vibrating. Pouring structure is used.

  In the tunnel lining concrete placement structure of the present embodiment, the fixed guide piece 18 extends from the outer peripheral surface of the tunnel lining form 10 in the thickness direction Y of the lining space 23 as shown in FIGS. The pair of plate-like members that protrude so as to move forward and backward and are arranged so as to be relatively slidable are preferably composed of a pair of plate-like members 17a and 17b superimposed in the axial direction X of the tunnel 12, and one plate-like member The (first plate member) 17a has an inner sandwiching recess 26a facing outward in the thickness direction, and the other plate member (second plate member) 17b is sandwiched outside in the thickness direction. The vibrator cable 19 is temporarily moved by relatively moving the pair of plate-like members 17a and 17b toward the side where the inner sandwiching recess 26a and the outer sandwiching recess 26b approach each other and sandwiching them between them. Secure (Figure (See (a)), the vibrator cable 19 is loosely fitted by releasing the temporarily fixed state by relatively moving the pair of plate-like members 17a and 17b to the side where the inner sandwiching recess 26a and the outer sandwiching recess 26b are separated from each other. It is designed to be movable (see FIG. 4B).

  In the tunnel lining concrete placing structure of this embodiment, preferably, the protective sleeve 27 covers the outer peripheral surface of the vibrator cable 19 at a position corresponding to the fixed guide piece 18 in a state where the vibrator cable 19 is temporarily fixed. Is installed.

  In this 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 of the lining space 23 is provided in the axial direction X of the tunnel 12 as described above. The first plate-like member 17a and the second plate-like member 17b made of, for example, a steel plate are arranged to overlap each other. As shown in FIGS. 5 (a), 5 (b) and 6 (a), the first plate-like member 17a has a vertically long rectangular front shape having a width of about 120 mm and a height of about 400 mm, for example. A semicircular cutout with a tapered edge is formed on the side of the upper end to provide an inner sandwiching recess 26a. In addition, a pair of first fixing pin locking holes 28a are formed at an interval in the vertical direction at the lower part of the first plate-like member 17a, and a handle piece 29a protruding vertically is integrally attached. Furthermore, slide guide pins 31a projecting laterally and slidably locked in first slide guide grooves 32a formed in a support plate 30 described later are formed on the side end surfaces on both sides of the first plate-like member 17a. Is provided.

  The second plate-like member 17b has, for example, a vertically long rectangular front shape having a width of about 120 mm and a height of about 500 mm, and a vertically long semicircle whose upper side is curved in a semicircular shape at the upper half portion thereof. A shaped opening 33 is provided. The upper side portion of the semicircular shape of the opening hole 33 is edged in a taper shape, and forms an outer sandwiching recessed portion 26 b facing inward in the thickness direction of the lining space 23. Further, a second fixing pin locking hole 28b is formed at the lower part of the second plate-like member 17b, and a handle piece 29b protruding vertically is integrally attached. Further, slide guide pins 31b projecting laterally and slidably locked in second slide guide grooves 32b formed in a support plate 30 described later are formed on the side end surfaces on both sides of the second plate member 17b. Is provided.

  A pair of plate-like members 17 a and 17 b constituting these fixed guide pieces 18 are arranged on both sides of each fixed guide piece 18 below the cover space 23 and integrated with the tunnel cover formwork 10. By being slidably supported by the attached support plate 30, it can project from the outer peripheral surface of the tunnel lining formwork so as to advance and retract in the thickness direction Y of the lining space 23. That is, as shown in FIG. 5B, the support plate 30 is disposed perpendicularly to the plate-like members 17a and 17b on both sides in the width direction across the pair of plate-like members 17a and 17b. It is fixed to the work form 10. Further, as shown in FIG. 5A, first and second slide guide grooves 32 a and 32, which are cut longitudinally along the thickness direction of the lining space 23, are formed on each of the support plates 30 on both sides. 32b is formed in parallel with a considerable length.

  The first plate member 17a is engaged with the slide guide pin 31a of the first plate member 17a in the first slide guide groove 32a, and the slide guide pin 31b of the second plate member 17b is engaged with the second slide guide groove 32b. The fixed guide piece 18 formed in the tunnel lining form 10 by advancing and retracting the 17a and the second plate-like member 17b in the thickness direction Y of the lining space 23 by, for example, an operation of grasping the handle pieces 29a and 29b. These plate-like members 17 a and 17 b are projected into the lining space 23 through the insertion opening 46, and the inner sandwiched recess 26 a and the outer sandwiched recess 26 b are disposed in the middle portion in the thickness direction of the lining space 23. From the first plate-like member 17a and the second plate-like member 17b to the state in which the first plate-like member 17a and the second plate-like member 17b are pulled out to the inside of the tunnel lining form 10 and removed from the lining space 23 (see FIGS. 9B and 9C). A pair of plate members 17a while adjusting the amount of protrusion, so that the 17b can be slid in a stable state.

  Moreover, in this embodiment, as shown to Fig.4 (a), (b), the 2nd plate-shaped member 17b side of the pair of plate-shaped members 17a and 17b piled up in the axial direction X of the tunnel 12 is shown. Further, the positioning and holding plate 34 is attached to the tunnel lining formwork 10 as a single piece with the both sides sandwiched by the support plates 30 below the lining space 23. A third fixing pin locking hole 35 is formed in the positioning holding plate 34.

  In a state where the pair of plate-like members 17a and 17b are relatively moved to the side where the inner sandwiching recess 26a and the outer sandwiching recess 26b approach each other, and the vibrator cable 19 is sandwiched therebetween and temporarily fixed (FIG. 4 (a )), The first fixed pin locking hole 28a below the pair of first fixed pin locking holes 28a of the first plate member 17a, and the second fixed pin locking hole of the second plate member 17b. 28b and the third fixing pin locking hole 35 of the positioning holding plate 34 are matched and the fixing pin 36 is inserted and locked, whereby the vibrator cable 19 can be firmly held in a temporarily fixed state. Become.

  On the other hand, in a state where the vibrator cable 19 can be freely fitted and moved by relatively moving the pair of plate-like members 17a and 17b to the side where the inner sandwiching recess 26a and the outer sandwiching recess 26b are separated from each other and releasing the temporary fixing. (See FIG. 4B), the upper first fixed pin locking hole 28a of the pair of first fixed pin locking holes 28a of the first plate-shaped member 17a and the second of the second plate-shaped member 17b. The state in which the vibrator cable 19 can be loosely fitted and moved by matching the fixing pin locking hole 28b with the third fixing pin locking hole 35 of the positioning holding plate 34 and inserting and locking the fixing pin 36. It becomes possible to hold firmly.

  In the present embodiment, a plurality of fixed guide pieces 18 are provided in series as a constant installation interval a in the axial direction X of the tunnel, for example, with an interval of 1000 mm (see FIG. 3). Moreover, in this embodiment, as shown in FIG. 7, the rod-shaped vibrator 20 connected to the tip of the vibrator cable 19 and disposed in the vicinity of 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. Furthermore, in this embodiment, the shock absorbers 37 are attached to both ends of the rod-shaped vibrator 20, and the cable of the wife formwork 16 is removed in order to remove the rod-shaped vibrator 20 from the lining space 23 after the concrete is compacted. When the bar-shaped vibrator 20 is extracted from the lining space 23 through the through-hole, even if the extracted bar-shaped vibrator 20 collides with surrounding equipment in the tunnel 12, the impact can be effectively mitigated. ing.

  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, as shown in FIGS. 4A and 4B, the protective sleeve 27 is provided on the vibrator cable 19 at a position corresponding to the fixed guide piece 18 when temporarily fixed to the lining space 23. It is installed. The protective sleeve 27 is provided to protect the vibrator cable 19 from being damaged by the gripping force by the pair of plate-like members 17a and 17b of the fixed guide piece 18 at the time of temporary fixing. In the present embodiment, As shown in FIGS. 8A and 8B, a pair of half-splitting sleeves 27a and 27a is used. A mounting groove 40 having a semicircular cross section is formed on the inner side surface of each half-cracked sleeve 27a, and a sandwiched stepped portion 41 and a band mounted on both sides of the sandwiched stepped portion 41 are formed on the outer side surface. A groove 42 is provided. At a predetermined position of the vibrator cable 19, for example, a rubber band 43 is attached to the band mounting groove 42 and tightened in a state where the vibrator cable 19 is covered by the pair of half-slit sleeves 27 a and 27 a while the mounting groove 40 is closely attached to the outer peripheral surface. Thus, the protective sleeve 27 is attached to the vibrator cable 19 so as to be detachable and recoverable. In addition, the sandwiching step portion 41 is engaged with the inner sandwiching recess 26a and the outer sandwiching recess 26b of the pair of plate-like members 17a and 17b of the fixed guide piece 18 when temporarily fixed, and the protective sleeve 27 is fixed to the fixed guide piece. It is possible to effectively avoid displacement from the position 18.

  In addition, the protective sleeve 27 may be formed of a pair of half-splitting sleeves 27a and 27a, or may have no sandwiching step 41 for the purpose of protecting the vibrator cable 19 from damage. Further, for example, a cylindrical sleeve member may be caulked and a cylindrical sleeve member may be attached to the vibrator cable 19 by a detachable fixing means. Further, when the vibrator cable 19 has sufficient strength against the gripping force by the pair of plate-like members 17a and 17b, it is not always necessary to provide a protective sleeve.

  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 38, 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. 39 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 39, 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 39 introduced into the lining space 23 from the wire introduction hole passes through the wire guide hole of the wire guide piece 44 arranged in series with the fixed guide piece 18, thereby the lining space 23. After being guided to the middle part in the thickness direction, it is preferable to be connected to the tip of the rod-like vibrator.

  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 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. 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. , The rod-shaped vibrator 20 and the vibrator cable 19 can be easily and smoothly moved toward the end form frame 16, thereby efficiently and effectively covering the concrete covering 11 a of the crown portion 13 of the tunnel 12. Lining with good quality and good surface finish It is possible to obtain a Nkurito 11a.

  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.

  Further, as shown in FIGS. 9A to 9C, for example, a roof lid piece 45 bent in an L shape is provided at the upper end of the second plate-like member 17b constituting the fixed guide piece 18, and a vibrator cable is provided. 19 until the rod-shaped vibrator 20 passes through the fixed guide piece 18 until the slide guide pins 31a and 31b of the plate-like members 17a and 17b come into contact with the lower ends of the slide guide grooves 32a and 32b of the support plate 30. When the first plate-like member 17a and the second plate-like member 17b are slid downward and the fixed guide piece 18 is pulled out and removed from the lining space 23, the roof cover piece 45 forms a tunnel lining formwork. It is also possible to prevent the concrete from flowing out from the insertion opening 46 by closing the insertion opening 46 of the fixed guide piece 18 formed in the opening 10. .

  Further, the pair of plate-like members arranged to be relatively slidable with the fixed guide piece is not necessarily a pair of plate-like members superimposed in the axial direction of the tunnel, for example, as shown in FIG. The first plate-like member 47a which can have the inner sandwiching recessed portions 49 along the side edges 48a on both sides of the U-shaped notch groove 48 formed in the second plate-like member 47b is connected to the second plate-like member 47b. It may be slid in the same plane.

(A)-(c) is a side view showing a part of the work procedure of laying concrete placing work including a tunnel lining concrete placing method according to a preferred embodiment of the present invention as a cross-sectional view. It is. 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 schematic side view for explaining a state in which a vibrator cable is temporarily fixed by a fixed guide piece, and (b) is a schematic side view for explaining a state in which the vibrator cable is loosely fitted. (A) is a schematic side view explaining the structure of a fixed guide piece, (b) is a schematic front view. (A) is a front view of one plate-shaped member which comprises a fixed guide piece, (b) is a front view of the other plate-shaped member. It is a schematic side view explaining the state which fixed the rod-shaped vibrator temporarily by the fixed guide piece. (A) is a perspective view of the half crack sleeve which comprises a protection sleeve, (b) is a side view of a protection sleeve. (A) is the fragmentary perspective view explaining the fixed guide piece which provided the roof cover piece in the other plate-shaped member, (b) is the schematic front view of the state which closed the insertion opening of the fixed guide piece by the roof cover piece, (C) is a schematic side view of the state where the insertion opening of the fixed guide piece is closed by the roof lid piece. It is a schematic front view which illustrates other forms of a fixed guide piece. (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 formwork (concrete lining formwork)
DESCRIPTION OF SYMBOLS 11 Covering concrete 11a Covering concrete 12 of a crown part Tunnel 13 Crowning part 15 of a tunnel Existing covering concrete 16 End formwork 17a 1st plate-shaped member (one plate-shaped member)
17b Second plate member (the other plate member)
18 Fixed guide piece 19 Vibrator cable 20 Bar-shaped vibrator 21 Vibrator cable 22 Covering surface 23 Covering space 26a Inner holding recess 26b Outer holding recess 27 Protective sleeve 30 Support plate 39 Wire member 40 Mounting groove 45 Roof cover piece X Tunnel axis Direction Y Thickness direction of lining space

Claims (4)

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 placing method for compacting the concrete while moving the rod-like vibrator toward the end form by pulling the vibrator cable,
Projecting on the outer peripheral surface of the tunnel lining formwork, a plurality of fixed guide pieces having a loose fitting fixing function of the vibrator cable are arranged in series at intervals in the axial direction of the tunnel,
Before pouring concrete into the lining space, the vibrator cable is temporarily fixed in the axial direction of the tunnel while holding the vibrator cable in the middle portion in the thickness direction of the lining space by the fixing guide piece. In addition, after pouring concrete, a tunnel lining concrete placement method in which the vibrator cable is switched to a loose fitting state and is pulled to the end form frame side while vibrating the rod-like vibrator.   The tunnel lining concrete placing method according to claim 1, 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 claim 1 or 2,
Projecting on the outer peripheral surface of the tunnel lining formwork, a plurality of fixed guide pieces having a loose fitting fixing function of the vibrator cable are arranged in series at intervals in the axial direction of the tunnel,
Before pouring concrete into the lining space, the vibrator cable is held by the fixed guide piece at the middle portion in the thickness direction of the lining space and linearly arranged in the axial direction of the tunnel and temporarily fixed. And
After pouring concrete, it is configured by switching to a state in which the vibrator cable is loosely fitted, and pulling to the end form side while vibrating the rod-like vibrator,
The fixed guide piece is composed of a pair of plate-like members disposed so as to be relatively slidable and projecting from the outer peripheral surface of the tunnel lining formwork so as to advance and retreat in the thickness direction of the lining space. The plate-shaped member has an inner sandwiched concave portion facing outward in the thickness direction, and the other plate-shaped member has an outer sandwiched concave portion facing inward in the thickness direction,
The pair of plate-like members are relatively moved toward the side where the inner sandwiching recess and the outer sandwiching recess approach each other and sandwiched between them, thereby temporarily fixing the vibrator cable, and the pair of plate-like members are placed on the inner side. A tunnel lining concrete placing structure that allows the vibrator cable to be loosely fitted and moved by releasing a state in which the sandwiched recess and the outer sandwiched recess are moved relative to each other and temporarily fixed.   The tunnel lining concrete placement structure according to claim 3, wherein a protective sleeve is attached to cover an outer peripheral surface of the vibrator cable at a position corresponding to the fixed guide piece in a state where the vibrator cable is temporarily fixed.

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