JP4812666B2 - Tunnel lining concrete placement method - Google Patents

Description

  The present invention relates to a tunnel lining concrete placing 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 (see, for example, Patent Document 1). 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 a height region that is difficult to be compacted by the vibrator 58 while supplying the concrete 57 from the inspection window 56, a region of a crown portion (crown portion) 59 (see FIG. 10A) of the tunnel 53 is used. The concrete 57 of the crown portion 59 is driven by a concrete blow-up method from a concrete supply port 60 as a blow-up port provided at the top end portion of the tunnel lining formwork 50, and directly compacted using a vibrator. The pattern which forms is adopted.

More specifically, after the concrete lining formwork 50 is installed at a predetermined position, a side wall 55 is formed in the lining space 61 between the concrete lining formwork 50 and the inner peripheral surface 54 of the tunnel 53. The step of compacting using a vibrator 58 while pouring concrete 57 through the lower inspection window 56 (see FIG. 11A), and further toward the arch-shaped portion 52 above the side wall 55 The step of compacting using the vibrator 58 while pouring the concrete 57 through the inspection window 56 (see FIG. 11B), and further up to the front of the crown 59 of the arch-shaped portion 52 and the necessary In response to this, the concrete 57 is poured through the concrete supply port 60 and compacted using the vibrator 58 (see FIG. 11C), and the crown 59 A step of pouring concrete 57 sequentially from a portion of the lining space 61 on the side of the existing lining concrete 62 through the concrete supply port 60, and filling the concrete 57 to the end form 63 without compacting directly using a vibrator ( According to FIG. 11 (d)), the lining concrete is placed.
JP 2002-147193 A

  However, in the conventional lining concrete placement method using the tunnel lining formwork 50 as described above, it is possible to manually apply from a large number of inspection windows 56 that are provided dispersed throughout the tunnel lining formwork 50. Since it is necessary to compact the concrete while inserting the vibrators 58, a lot of labor is required. Therefore, it is desirable to reduce the work for inserting and compacting the vibrator 58 from the inspection window 56 by human power as much as possible so that the lining concrete can be placed efficiently. Further, in the conventional lining concrete placing method as described above, the concrete 57 placed on the tunnel crown portion (crown portion) 59 cannot be compacted directly using a vibrator. The reliability of the quality of the lining concrete in the portion 59 is lowered, and in particular, in the vicinity of the existing lining concrete 62, an air pool or a cavity is likely to be generated.

  The present invention has been made paying attention to such a conventional problem, reducing the work of inserting and compacting the vibrator by human power from the inspection window, without requiring a lot of manpower and labor, It is possible to place lining concrete efficiently and to place lining concrete in the crown effectively while compacting, especially in the vicinity of the crown in the vicinity of existing lining concrete. An object of the present invention is to provide a tunnel lining concrete placing method capable of sufficiently compacting concrete.

  The present invention relates to a tunnel lining concrete placing method for forming lining concrete using a tunnel lining formwork, and covering between the outer peripheral surface of the tunnel lining formwork and the lining surface of the inner periphery of the tunnel. In the tunnel crown in the work space, a cable extending through the end form and extending in the tunnel axial direction toward the existing lining concrete is arranged to be towable from the outside of the end form, and the cable is installed in the tunnel crown. By changing the direction so as to curve downward in the area of the lining concrete side, the vibrator attached to the tip of the cable is placed in a state suspended from the tunnel side part of the lining space, and the tunnel side part As the concrete supplied to the lining space rises, the vibrator is raised while pulling the cable to compact the concrete while the concrete is compacted. After placing both sides of the cleat and moving the vibrator to the tunnel crown, the vibrator is drawn to the existing lining concrete side via a tensile wire member connected to the tip of the vibrator, and the existing cover Place the vibrator along the tunnel axial direction in close proximity to the concrete, and then put the concrete into the lining space of the tunnel crown from the concrete supply port provided in the tunnel crown of the tunnel lining formwork Provided is a tunnel lining concrete placing method for compacting the supplied concrete while moving the vibrator toward the end form frame side while pulling the cable and placing the concrete covering the crown of the tunnel. This achieves the above object.

  Further, according to the tunnel lining concrete placing method of the present invention, the cable protrudes from the outer peripheral surface of the tunnel lining formwork so as to be able to protrude and protrude at the tunnel crown, and is spaced apart in the axial direction of the tunnel. It is preferable to be guided by a guide piece having a plurality of cable insertion holes arranged in series and pulled toward the end form frame side.

  Further, according to the tunnel lining concrete placing method of the present invention, the cable is bent downward with a curvature that can be pulled through a guide jig that protrudes from the outer peripheral surface of the tunnel lining formwork. It is preferable that the direction is changed.

  According to the tunnel lining concrete pouring method of the present invention, the work of inserting a vibrator manually from the inspection window and compacting is reduced, and the lining concrete is efficiently carried out without requiring much manpower and labor. Can be placed while effectively compacting the lining concrete of the crown part, especially the crown lining concrete in the vicinity of the existing lining concrete Can be compacted.

  The tunnel lining concrete placement method according to a preferred embodiment of the present invention is, as shown in FIGS. 1 to 4, for example, in a mountain tunnel construction method, by using a tunnel lining form 10, the side portion of the tunnel 12. When the upper lining concrete 11 is continuously formed with the inverted concrete 13 at the bottom of the tunnel or is formed so as to be continuous, the outer peripheral surface 10a of the tunnel lining form 10 and the tunnel Adopted as a method to efficiently place the concrete 14 supplied to the lining space 17 between the lining surface 42 sprayed with the sprayed concrete 41 on the inner peripheral ground 40 and sufficiently compacted. It has been done.

  Here, in this embodiment, the tunnel lining form 10 is, for example, a slide-movable centle known as the prior art, and for every predetermined span of, for example, about 10 m as the tunnel 12 excavates. In addition, 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 in the digging direction X toward the front.

  And the tunnel lining concrete placement method of this embodiment is a tunnel placement method in which the lining concrete 11 is formed using the tunnel lining form 10, as shown in FIGS. The tunnel crown portion 15 in the lining space 17 between the outer peripheral surface 10a of the lining mold 10 and the lining surface 42 on the inner periphery of the tunnel passes through the end form 16 and tunnels toward the existing lining concrete 18. A cable 19 extending in the axial direction X is disposed so as to be able to be pulled from the outside of the end formwork 16, and the direction of the cable 19 is changed so as to bend downward in a region on the existing lining concrete 18 side. A vibrator 21 attached to the tip of 19 is suspended from the tunnel side portion of the lining space 17 (see FIG. 2) and provided to the lining space 17 on the tunnel side portion. As the concrete 14 is raised, the vibrator 21 is raised while pulling the cable 19, and both sides of the lining concrete 11 are driven while the concrete 14 is compacted (see FIGS. 3 and 5). Is moved to the tunnel crown 15, the vibrator 21 is drawn toward the existing lining concrete 18 through the pulling wire member 35 connected to the tip portion of the vibrator 21, and the vibrator 21 is brought close to the existing lining concrete 18. Are arranged along the tunnel axial direction X (see FIGS. 6 and 7), and thereafter, the concrete 14 is passed through the tunnel crown 15 from the concrete supply port 22 provided in the tunnel crown 15 of the tunnel lining form 10. The vibrator 21 is moved to the end form 16 side while pulling the cable 19. The concrete 14 has been supplied while in compacted and pouring the lining concrete 11 of the tunnel crown 15 (see FIGS. 4 and 8)

  Further, in the present embodiment, a plurality of cables 19 are arranged in series at the tunnel crown portion 15 so as to protrude from the outer peripheral surface 10a of the tunnel lining form 10 so as to protrude and retract, and are spaced in the axial direction X of the tunnel. The cable is guided by a guide piece 23 having a cable insertion hole 23a and pulled toward the end formwork 16 side.

  Furthermore, in this embodiment, the direction of the cable 19 is changed so as to be bent downward with a curvature that can be pulled through the guide jig 20 that protrudes from the outer peripheral surface 10a of the tunnel lining form 10 so as to be able to protrude and retract. (See FIG. 5).

  In this embodiment, prior to placing the lining concrete 11 on the side and upper part of the tunnel 12, the vibrators 21 and 21 ′ are suspended in the lining space 17 on the side of the tunnel as shown in FIG. 2. Arrange in the state. That is, according to the present embodiment, the vibrator 21 (No 6, 5, 4) arranged on the existing lining concrete 18 side extends in the tunnel axial direction X toward the end formwork 16 at the tunnel crown 15. In addition, it is connected to each of the cable reels 24 for traction provided on the outside through the end form 16 so as to be curved downward with a tractable curvature in the area on the existing lining concrete 18 side. It is arranged at the lower end portion of the tunnel side portion via the cable 19 to be turned. These vibrators 21 compact the concrete 14 as the concrete 14 supplied to the lining space 17 rises while automatically controlling and winding the cable 19 by mechanical operation of the cable reel 24, for example. It is possible to rise while. Further, one end of a wire, cable, chain, or the like is connected to the tip of the vibrator 21 as a tensile wire member 35, and the other end portion of each pull wire member 35 is connected to the tunnel crown portion 15. The tunnel lining mold 10 is extended to the inside of the tunnel lining mold 10 through a cable hole 36 that is formed in an area near the existing lining concrete 18 in the lining mold 10 (see FIG. 5).

  Moreover, in this embodiment, vibrator 21 '(No3, 2, 1) arrange | positioned in the area | region on the side of the end form 16 apart from the existing lining concrete 18 is each the arch of the tunnel formwork 10 for example. Via a cable 19 ′ extending downward from an openable / closable inspection window 25 provided on the shoulder portion of the shape portion and connected to a traction cable reel provided inside the inspection window 25. , Arranged at the lower end of the tunnel side. These vibrators 21 ′ compact the concrete 14 as the concrete 14 supplied to the lining space 17 rises while automatically controlling and winding the cable 19 ′ by mechanical operation of the cable reel. It is possible to rise while.

  Here, the vibrators 21 and 21 ′ are publicly known devices that are widely used as compacting devices for concrete, for example, including electromagnetic vibrators, vibrators that vibrate by the rotational force of a motor, and the like. Vibrator cables 19 and 19 'made of a flexible power supply hose accommodating connection lines and the like are integrally connected to rear end portions of 21 and 21'.

  The cables 19 and 19 'for the vibrator are, 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 a conductor and an intervening string are attached to the outer peripheral surface of the polyamide tube. Alternatingly arranged in the circumferential direction, further covered with a sheath (outer skin) having an outer diameter of about 21.8 mm, and then covered with a wear-resistant tube, a known outer diameter of, for example, about 37.2 mm is formed. It is a cable member. The cables 19, 19 ′ resist the frictional force (adhesive force) with the concrete 14 from the vibrators 19, 19 ′ embedded in the concrete 14 filled in the lining space 17. , 21 'with sufficient tensile strength to pull.

  In the present embodiment, a plurality of inspection windows 25 that are distributed over the entire tunnel lining form 10 and can be opened and closed are provided at predetermined positions designed in advance. These inspection windows 25 are appropriately selected. For example, a concrete supply hose is inserted into the lining space 17 from the inside of the tunnel lining form 10 through the inspection window 25, and the concrete 14 is supplied to the lining space 17. Further, if necessary, a vibrator 21 ′ can be inserted from the inspection window 25 and the supplied concrete 14 can be compacted. The vibrator 21 'is suspended from the inspection window 25 provided on the shoulder of the arch-shaped portion as described above.

  In this embodiment, the cable 19 extending in the tunnel axial direction X toward the existing lining concrete 18 through the end form 16 in the tunnel crown 15 is provided with an existing lining as shown in FIG. In the vicinity region of the concrete 18, the direction is changed so as to be bent downward with a curvature that can be pulled through a guide jig 20 that protrudes from the outer peripheral surface 10 a of the tunnel lining form 10 so as to protrude and retract.

  Here, as the guide jig 20, for example, as shown in FIG. 9, a cylindrical rod member 26, and a guide member 27 that is fixed by welding a joining flange 27 a to the inner side surface of the tunnel covering formwork 10, Can be used. That is, the rod member 26 is guided by the guide member 27 and protrudes from the protruding hole 31 provided in the outer peripheral surface 10 a of the tunnel lining form 10 so as to be able to appear and retract in the thickness direction Y of the lining space 17. In addition, the portion of the rod member 26 disposed inside the tunnel lining form 10 is provided with a handle 28 for intrusion operation at the lower end portion, and pin insertion holes 29a, 29b is formed penetrating in the transverse direction. By selectively fitting the pin insertion holes 29a and 29b to the pin fixing hole 30 provided at the lower end portion of the guide member 27 and inserting and fixing the fixing pin 34, the rod member 26 of the guide jig 20 is fixed. It is possible to hold each of the state in which the tunnel lining mold 10 protrudes from the outer peripheral surface 10a and the state in which the rod member 26 is removed and accommodated inside the tunnel lining mold 10. Become.

  Further, in the present embodiment, the rod member 26 of the guide jig 20 that protrudes and retracts from the protrusion hole 31 is provided at the outer peripheral portion thereof with the passing position of the cable 19 in the middle of the lining space 17 in the thickness direction Y. A guide recess 32 is formed to hold the part. The guide recess 32 is formed, for example, by cutting out the outer peripheral portion of the rod member 26 into a shallow triangular shape, and when the cable 19 and the vibrator 21 are slid along the outer peripheral portion of the rod member 26 by pulling the cable 19, Is guided to the middle portion of the lining space 17 in the thickness direction Y, and the concrete 14 can be more efficiently compacted. In the present embodiment, the guide jig 20 is arranged on the curve of the curvature that can pull the cable 19 together with the guide piece 23 ′ of the bending start portion for each cable 19 arranged in the tunnel crown portion 15. Two arch-shaped portions of the tunnel lining form 10 are provided.

  Furthermore, in this embodiment, as the guide piece 23 having a plurality of cable insertion holes 23a arranged in series at intervals in the axial direction X for guiding the cable 19 in the tunnel axial direction X in the tunnel crown portion 15. For example, a fixed guide piece having a function of loosely fixing a vibrator cable described in Japanese Patent Application No. 2006-246086 related to the application of the present applicant can be preferably used.

  In the present embodiment, as shown in FIG. 5, a plurality of guide pieces 23 are arranged in series from the end frame 16 side to the guide piece 23 ′ at the bending start portion with an interval in the axial direction X of the tunnel. At the same time, a plurality of pieces are arranged in series from the guide piece 23 ′ at the bending start portion to the existing lining concrete 15 side. Further, the tension wire member 35 connected to the tip of the vibrator 21 suspended from the tunnel side portion is between the guide piece 23 ′ at the bending start portion and the guide piece 23 at the next existing lining concrete 15 side. From the cable insertion hole 23a of the guide piece 23 on the next existing lining concrete 15 side, and further the cable insertion hole 23a of the guide piece 23 on the existing lining concrete 15 side, the other end is The tunnel lining form 10 is extended to the inside of the tunnel lining form 10 through a cable hole 36 that is formed in an area near the existing lining concrete 18.

  As a result, the vibrator 21 ascends with the placement of the tunnel side portion and the arching lining concrete 11 and moves to the tunnel crown portion 15 after passing through the guide jig 20 (see FIG. 6). If the vibrator 21 is pulled toward the existing lining concrete 15 via a tensile wire member 35 extending inside the tunnel lining formwork 10, the vibrator 21 covers the existing lining of the guide piece 23 'at the bending start portion. While being inserted through the cable insertion hole 23a of the guide piece 23 on the side of the concrete 15 to be worked, it is drawn to the side of the existing lining concrete 15 (see FIG. 7), and along the tunnel axial direction X in the state of being close to the existing lining concrete 15 Will be arranged as follows.

  In this embodiment, as shown in FIG. 2, from the state where the vibrators 21 and 21 ′ are suspended in the lining space 17 on the tunnel side portion, as shown in FIG. The concrete 14 is supplied to the lining space 17 from the inspection window 25, and the concrete is compacted while the vibrators 21 and 21 'are lifted by pulling the cables 19 and 19' by the cable reel 24 or the like. The lining concrete 11 on the side of the tunnel is placed while winding the cables 19, 19 '.

  Subsequently, for example, the concrete 14 is supplied from the inspection window 25 arranged in the middle part or the shoulder, and the concrete 14 is also supplied from the concrete supply port 22 provided in the tunnel crown 15 as necessary, and the cable reel 24 is supplied. For example, the shoulder of an arch-shaped portion is obtained by compacting the concrete 14 while raising the vibrators 21, 21 ′ by pulling the cables 19, 19 ′ by, for example, and winding the remaining cables 19, 19 ′ with the cable reel 24, etc. The lining concrete 11 is placed up to (see FIG. 4).

  Here, with the rise of the concrete 14 in the lining space 17 on the side of the tunnel, the cable 19 and the vibrator 21 suspended from the tunnel crown 15 rise, and these are the outer peripheral surfaces of the tunnel lining formwork 10. After passing through the rod member 26 of the guide jig 20 protruding from 10a, the rod member 26 of the guide jig 20 after passing through them is retracted to the tunnel lining formwork 10 side through the protruding hole 31. The inside of the tunnel lining form 10 is removed.

  When the lining concrete 11 is placed up to the shoulder portion of the arch-shaped portion, as shown in FIG. 4, the vibrator 21 ′ (No 3, 2, 1) arranged in the region on the side of the end form 16 is inserted into the inspection window. Remove via 25.

  Furthermore, the vibrator 21 (No 6, 5, 4) connected to the cable 19 extending to the tunnel crown 15 that has been arranged in the area on the existing lining concrete 18 side has moved to the tunnel crown 15 (FIG. 6), by being pulled to the existing lining concrete 15 side via a tensile wire member 35 extending inside the tunnel lining mold 10, as described above, the guide piece 23 ′ at the curve start portion While being inserted into the cable insertion hole 23a of the guide piece 23 on the existing lining concrete 15 side, the tunnel shaft is pulled toward the existing lining concrete 15 side (see FIG. 7) and close to the existing lining concrete 15 Arranged along the direction X. The cable 19 following the vibrator 21 is supported by guide pieces 23 having a plurality of cable insertion holes 23a arranged in series at intervals in the axial direction X of the tunnel, and is guided by these guide pieces 23. It will be in the state which can be pulled to the wife formwork 16 side with the vibrator 21. FIG.

  Furthermore, the tunnel crown portion 15 of the tunnel lining form 10 adjacent to, for example, the existing lining concrete 18 in a state where the cable 19 and the vibrator 21 can be moved in the tunnel axial direction X while being guided by the guide piece 23. The concrete 14 is supplied from the concrete supply port 22 provided in the tunnel and the concrete supply port appropriately provided in the tunnel crown 15 at a predetermined interval on the end form 16 side, and the lining space 17 of the tunnel crown 15 is provided. The concrete 14 is filled.

  Thereafter, the cable 19 and the vibrator 21 movable in the tunnel axis direction X are pulled by the cable reel 24, and the filled concrete 14 is compacted while being moved to the end form frame 16 side (see FIG. 8). When vibrator 21 moves to end formwork 16, it is pulled out from lining space 17 while driving vibrator 21, and concrete is injected from end formwork 16 so as to fill the space generated by the extraction, and the tunnel lining is constructed. The placing work of the lining concrete 11 in the span where the formwork 10 is installed is completed.

  And according to the tunnel lining concrete placement method of this embodiment, the operation of inserting a vibrator from the inspection window 25 by human power and compacting it can be reduced efficiently, without requiring a lot of manpower and labor. The lining concrete 11 can be cast, and the lining concrete 11 of the tunnel crown 15 can be cast while being effectively compacted, especially in the vicinity of the existing lining concrete. It becomes possible to sufficiently compact the lining concrete.

  That is, according to the present embodiment, the cable 19 extending through the end frame 16 and extending in the tunnel axial direction X is disposed in the lining space 17 of the tunnel crown portion 15 so as to be capable of being pulled, and the cable 19 is already installed. The vibrator 21 attached to the tip of the cable 19 is arranged in a suspended state on the tunnel side portion of the lining space 17 by changing the direction so as to bend downward in the region near the lining concrete 18, and the tunnel side portion As the concrete 14 supplied to the lining space 17 is raised, the vibrator 21 is raised while pulling the cable 19 and both sides of the lining concrete are driven while the concrete 18 is compacted. The cable reel 24 is used to eliminate or reduce the work of inserting and compacting the vibrator manually. While controlling the traction of the cable 19 it is possible to slide into Da設 efficiently lining concrete 11.

  In addition, according to the present embodiment, when the both side portions of the lining concrete 11 are placed below the tunnel crown portion 15, the vibrator 21 can be moved in the tunnel axial direction X in the lining space 17 of the tunnel crown portion 15. In this way, the concrete 14 is supplied to the lining space 17 of the tunnel crown 15, the concrete 14 supplied while moving the vibrator 21 in the tunnel axial direction X while pulling the cable 19 is compacted, and the tunnel crown 15 lining concrete 11 is placed, so that the lining concrete 11 of the tunnel crown 15 can be sufficiently compacted by the vibrator 21, and air pools and cavities are generated in the lining concrete 11 of the tunnel crown 15. It is possible to obtain a high-quality lining concrete 11 by avoiding the deterioration of the surface finish. .

  Furthermore, according to the present embodiment, when the vibrator 21 is moved to the tunnel crown portion 15, by temporarily pulling the vibrator to the existing lining concrete 18 side via the tensile wire member 35 connected to the tip portion of the vibrator, Since the vibrator is placed in the vicinity of the existing lining concrete 18 and then the lining concrete 11 of the tunnel crown 15 is placed, the lining concrete 11 of the tunnel crown 15 near the existing lining concrete 18 is sufficient. Thus, it is possible to effectively avoid the occurrence of air pools and cavities in the vicinity of the existing lining concrete 62 in particular.

  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, and the lining surface that forms the lining space between the outer periphery of the tunnel lining formwork is In addition to natural ground covered with sprayed concrete, it may be a lining surface for performing secondary lining by the inner peripheral surface of the tunnel after performing primary lining. After waiting for the tunnel lining space to be filled with concrete, the cable is pulled and the vibrator is moved to the end form frame, and the concrete in the tunnel lining space is compacted. It is not always necessary, and in parallel with the concrete being supplied to the lining space, for example, the concrete can be compacted by a chasing method from the existing lining concrete toward the end formwork side. Furthermore, when the cable extending to the tunnel crown of the lining space is bent downward and the vibrator is suspended on the tunnel side, a plurality of cables are bent downward in the entire area of the existing lining concrete side. It is not always necessary to suspend the vibrator, and at least in the vicinity of the existing lining concrete, it is sufficient to suspend the vibrator by bending at least one cable arranged in the tunnel crown downward.

In the tunnel lining concrete placement method according to a preferred embodiment of the present invention, it is a cross-sectional view seen from the tunnel axial direction showing a state in which the tunnel lining formwork is installed along the lining surface of the inner periphery of the tunnel. It is a schematic perspective view explaining the operation | work process of the tunnel lining concrete placement method which concerns on preferable one Embodiment of this invention. It is a schematic perspective view explaining the operation | work process of the tunnel lining concrete placement method which concerns on preferable one Embodiment of this invention. It is a schematic perspective view explaining the operation | work process of the tunnel lining concrete placement method which concerns on preferable one Embodiment of this invention. It is a conceptual diagram explaining the situation where the concrete of the tunnel side part of a lining space is compacted using the vibrator which changed the direction of the cable extended to a tunnel crown part so that it might be bent below, and was suspended. It is a conceptual diagram explaining the situation which pulled the cable and moved the vibrator which changed the direction of the cable extended in a tunnel crown so that it might curve below, and was hung to a tunnel crown. It is a conceptual diagram explaining the condition which draws the vibrator which pulled the cable and moved to the tunnel crown part to the existing lining concrete side through the tension wire member, and arranges it in proximity. It is a conceptual diagram explaining the condition where the filled concrete is compacted while pulling the cable installed at the crown of the tunnel and moving it to the end form frame side. It is sectional drawing which illustrates a guide jig. (A) is sectional drawing seen from the tunnel axial direction which shows the state which installed the concrete lining formwork along the lining surface of a tunnel inner periphery in the conventional tunnel lining concrete placement method, (b) is the same side surface FIG. (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

DESCRIPTION OF SYMBOLS 10 Concrete lining formwork 10a Outer surface 11 of tunnel lining formwork 11 Covering concrete 12 Tunnel 13 Invert concrete 14 Concrete 15 Tunnel crown 16 End formwork 17 Covering space 18 Existing lining concrete 19, 19 'Cable 20 Guide jigs 21, 21 ′ Vibrator 22 Concrete supply port 23 Guide piece 23 a Cable insertion hole 23 ′ Guide piece 24 at the curve start portion 24 Cable reel 25 Inspection window 26 Rod member 27 of the guide jig Guide member 31 of the guide jig Hole 32 Guide recess 35 Tensile wire member 36 Cable hole X Tunnel axial direction (tunneling direction)
Y Thickness direction of lining space

Claims (3)

In the tunnel lining concrete placement method of forming lining concrete using a tunnel lining formwork,
In the tunnel crown in the lining space between the outer peripheral surface of the tunnel lining formwork and the inner lining surface of the tunnel, it extends in the tunnel axial direction through the end formwork and toward the existing lining concrete A vibrator attached to the tip of the cable by disposing the cable to be pulled from the outside of the end formwork and changing the direction of the cable so as to bend downward in the area of the existing lining concrete. Arranged in a suspended state on the tunnel side of the lining space,
With the rise of the concrete supplied to the lining space on the side of the tunnel, the vibrator is raised while pulling the cable, and both sides of the lining concrete are placed while compacting the concrete,
When the vibrator is moved to the tunnel crown, the vibrator is pulled toward the existing lining concrete via a pulling wire member connected to the tip portion of the vibrator, and the vibrator is moved close to the existing lining concrete. Arrange along the tunnel axis direction,
After that, the concrete is supplied from the concrete supply port provided in the tunnel crown portion of the tunnel lining formwork to the lining space of the tunnel crown portion, and the vibrator is moved to the end form mold side while pulling the cable. A tunnel lining concrete placement method in which concrete supplied is compacted and lining concrete is placed at the crown of the tunnel.   The cable is guided by a guide piece having a plurality of cable insertion holes arranged in series in the tunnel crown so as to protrude from the outer peripheral surface of the tunnel lining formwork and spaced in the axial direction of the tunnel. The tunnel lining concrete placing method according to claim 1, wherein the tunnel lining concrete is pulled toward the end form side.   3. The tunnel according to claim 1, wherein the direction of the cable is changed so as to be bent downward with a pullable curvature through a guide jig that protrudes from the outer peripheral surface of the tunnel lining formwork. Lining concrete placement method.

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