JP2009127229A - Tunnel lining concrete placing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel lining concrete placing method which enables concrete compaction to be smoothly performed by securing the linearly of a vibrator cable so as to reduce a pullout load when the vibrator cable is pulled to the side of an end form. <P>SOLUTION: A rod-like vibrator 20 is arranged in close vicinity to existing lining concrete 15 in a lining space 23 of a tunnel crest section 13, and the vibrator cable 19 is arranged in the state of being capable of being pulled out from the outside of the end form 16. When concrete 25 in a flowing state is infilled, the vibrator cable 19 is pulled to the side of the end form 16 together with the rod-like vibrator 20 so as to compact the infilled concrete 25. Additionally, a tensile force is applied to the vibrator cable 19 before the infilling operation of the concrete 25 in the flowing state into the lining space 23 of the tunnel crest section 13, so that the vibrator cable 19 can be kept in a linearly pulled state. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 method using a tunnel lining formwork called a centle as a method for forming tunnel lining concrete that is constructed to cover the ground mountain on the inner peripheral surface of the excavated tunnel Is generally adopted (see, for example, Patent Document 1 and Patent Document 2). For example, as shown in FIGS. 6A and 6B, the tunnel lining mold 50 is formed along the inner peripheral surface 54 of the tunnel 53 having an arch-shaped portion 52 such as a horseshoe shape. The lining space between the side wall 55 and the upper part, and between the installed tunnel lining formwork 50 and the ground covered with the sprayed concrete 56 on the inner peripheral surface 54 of the tunnel 53. By placing unreinforced concrete on 61 and curing it, lining concrete is formed so as to be continuous with the concrete of the inverted portion 51 at the bottom of the tunnel.

  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. As the excavation work proceeds, the tunnel lining mold 50 is moved from the rear to the front in the direction of excavation of the tunnel 53 while the tunnel lining form 50 is re-installed every predetermined lining span of about 10 m, for example. Using the frame 50, 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 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. 6) region of the tunnel 53 is referred to as the tunnel. Concrete is driven by a blow-up method from a concrete inlet 60 provided 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. Pattern 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. 7 (a)) and a step of compacting using a vibrator 58 while pouring concrete 57 through the middle inspection window 56 toward the upper arch-shaped portion 52 of the side wall 55 (FIG. 7 ( b)) and further compacting with the vibrator 58 while pouring the concrete 57 through the upper inspection window 56 and, if necessary, through the concrete inlet 60 to the front of the crown 59 of the arch-shaped portion 52. (See FIG. 7 (c)) and the concrete from the existing lining concrete 62 side portion of the crown 59 sequentially through the concrete inlet 60. 7 was pressed by the filling concrete up wife formwork 63 without compaction using direct vibrator (see FIG. 7 (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 3). In the lining concrete placement method of Patent Document 3, when a tunnel is constructed by a shield method that is different from the mountain tunnel method, the crown portion of the gap between the segment and the centle has a substantially 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 the concrete is inserted into the gap in the crown 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 3, the guide rail is provided also as a setup line for secondary lining concrete, for example.
JP 2001-280094 A JP 2003-262096 A JP 2002-30893 A

  In the method of placing concrete in a tunnel crown described in Patent Document 3, a guide rail having an L-shaped angle for guiding a rod-like vibrator in the tunnel axial direction is provided in the tunnel crown lining space in the tunnel axial direction. 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. Will cause a lot of waste in its materials and construction.

  For this reason, in a mountain tunnel or the like in which lining concrete is formed using unreinforced concrete without setting up a setup bar or the like, instead of a guide rail, for example, as shown in FIG. On the outer peripheral surface 50 of the frame, a plurality of guide pieces 64 are arranged in series and spaced in the axial direction X of the tunnel, and a vibrator cable 66 following the rod-like vibrator 65 is provided by the guide pieces 64. It is considered that the rod-shaped vibrator 65 is moved while being pulled from the existing lining concrete 62 side toward the end form frame 63 side by guiding.

  However, in the method of moving the rod-like vibrator 65 by pulling the vibrator cable 66 toward the end frame 63 side while guiding the vibrator cable 66 by the guide piece 64, the rod-like vibrator 65 and the vibrator cable 66 are covered with the tunnel crown. When the concrete is poured after being set in the space, the vibrator cable 66 is swept away by the own weight at the time of setting, or the concrete has a considerable specific gravity, particularly in a portion between the guide pieces 64. When moving from a predetermined set position, bending or meandering occurs, and it becomes difficult to maintain linearity.

  Further, when the vibrator cable 66 is bent or meandered in the placed concrete, the vibrator cable 66 is connected to the vibrator cable 66 together with the vibrated rod-like vibrator 65 in comparison with the case where the linearity is maintained. The pulling load at the time of pulling to the mold 63 side becomes excessive, and it may be difficult to pull or the vibrator cable 66 may be broken or damaged.

  The present invention has been made paying attention to such problems, and ensures linearity so that the vibrator cable does not bend or meander when filling the lining space of the tunnel crown with concrete. It is an object of the present invention to provide a tunnel lining concrete placing method capable of reducing the pull-out load when pulling the vibrator cable together with the rod-shaped vibrator to the end form frame side and smoothly compacting the concrete. To do.

  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. A rod-shaped vibrator is arranged in the tunnel wrapping space between the outer peripheral surface of the formwork and the lining surface of the inner periphery of the tunnel in the vicinity of the existing lining concrete, and the vibrator cable subsequent thereto is connected to the wife When the concrete is filled in the lining space of the tunnel crown portion with the rod-shaped vibrator, it is arranged in a state where it can be pulled from the outside of the wife mold frame by extending the mold frame side and penetrating the wife mold frame. A concrete placement method in which the vibrator cable is pulled toward the end form frame to compact the filled concrete, the tunnel Provided a tunnel lining concrete placement method that keeps the vibrator cable pulled straight by applying tension to the vibrator cable prior to filling the lining space of the crown with concrete. This achieves the above object.

  And, in the tunnel lining concrete placement method of the present invention, in the state where the rod-like vibrator is brought close to the existing lining concrete and detachably fixed, by pulling the vibrator cable to the end form frame side, It is preferable to apply tension to the vibrator cable.

  Further, in the tunnel lining concrete placing method of the present invention, the vibrator cable is attached by attaching a tensile wire member to the tip of the rod-like vibrator and pulling the rod-like vibrator to the existing lining concrete side by the tensile wire member. It is preferable to apply tension to the.

  According to the tunnel lining concrete placing method of the present invention, when filling the concrete into the lining space of the tunnel crown, the linearity is ensured so that the vibrator cable does not bend or meander, thereby forming a rod shape. The pull-out load when the vibrator cable is pulled with the vibrator toward the end form frame can be reduced, and the concrete can be compacted smoothly.

  As shown in FIGS. 1A to 1C, a tunnel lining concrete placing method according to a preferred embodiment of the present invention is a tunnel 12 using a tunnel lining formwork 10, for example, in a mountain tunnel construction method. In order to form the lining concrete 11a of the crown portion (crown portion) 13 of the tunnel 12, the side wall portion of the tunnel 12 below and After the arch-shaped portion of the lining concrete 11 is cast and formed (see FIGS. 1A and 1B), the lining space 23 of the tunnel crown 13 is filled as shown in FIG. 1C. This was adopted as a method for placing the concrete (green concrete) 25 in a fluidized state while being compacted smoothly.

  Here, in this embodiment, the tunnel lining form 10 is, for example, a slide-movable centle known as a conventional technique. As the tunnel 12 excavates, a predetermined covering of about 10 m is provided. The lining concrete 11 on the side portion and the upper portion of the tunnel 12 can be sequentially cast and formed while being re-installed from the rear to the front in the digging direction X of the tunnel 12 for each work span. Moreover, in this embodiment, the lining concrete 11 of a side wall part and an arch-shaped part flows through the inspection window 14 provided in the installed tunnel lining formwork 10 by the method similar to the conventional construction method, for example. The concrete 25 in a state is supplied, and a vibrator 14a as a vibration compacting device is inserted from the inspection window 14 to compact the supplied concrete 25, whereby the lining concrete 11 of the side wall portion and the arch-shaped portion is obtained. Then, it is cast and formed prior to the lining concrete 11a of the tunnel crown portion 13 (see FIGS. 1A and 1B).

  And the tunnel lining concrete placement method of this embodiment is a concrete placement method in which the lining concrete 11 is formed using the tunnel lining form 10, as shown in FIGS. 2 (a) to (d). In addition, the lining of the tunnel crown 13 between the outer peripheral surface of the tunnel lining form 10 and the lining surface 22 of the inner periphery of the tunnel, which is sandwiched between the existing lining concrete 15 and the end form 16 that are already formed. In the space 23, the rod-shaped vibrator 20 is disposed in the vicinity of the existing lining concrete 15 and the vibrator cable 19 following the bar-shaped vibrator 20 is extended to the side of the end form 16 to pass through the end form 16 so as to pass through the end form. When the concrete is placed in a state where it can be pulled from the outside of the frame 16 and the lining space 23 of the tunnel crown portion 13 is filled with the fluidized concrete 25, the vibrator 20 together with the rod-like vibrator 20 is placed. Cable 19 is driving his wife mold 16 side, the filled concrete 25 so that the compacting (see Figure 2 (d)). In addition, prior to the work of filling the lining space 23 of the tunnel crown 13 with the fluidized concrete 25, tension is applied to the vibrator cable 19 so that the vibrator cable 19 is kept in a linearly pulled state. (See FIGS. 2A and 2B).

  Furthermore, in this embodiment, tension is applied to the vibrator cable 19 by pulling the vibrator cable 19 toward the end frame 16 side in a state where the rod-like vibrator 20 is detachably fixed in the vicinity of the existing lining concrete 15. It is supposed to be.

  In the present embodiment, prior to the work of filling the lining space 23 of the tunnel crown 13 with the concrete 25, the rod-like vibrator 20 and the vibrator cable 19 are connected to the lining space 23 of the tunnel crown 13, for example, the wife mold 16. It is arrange | positioned in the state which can be pulled by the winding device 34 for the pulling installed in the outer side.

  The rod-like vibrator 20 is a well-known one that is widely used as a compacting device for concrete, for example, including an electromagnetic vibrator, a vibrator that vibrates by the rotational force of a motor, and the like, and the rear end of the rod-like 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 rod-shaped vibrator 20 is installed at an intermediate portion in the thickness direction of the lining space 23 in the state of being supported by a guide piece 35 described later, in the vicinity of the existing lining concrete 15.

  Further, one end portion of the fixing wire 36 is attached to the tip of the rod-like vibrator 20. The fixing wire 36 is inserted into a wire guide 37 fixed to the end surface 15a of the existing lining concrete 15 and the other end is located near the existing lining concrete 15 of the tunnel lining formwork 10. Through the wire hole formed in the opening, it extends to the inside of the tunnel lining mold 10 and is detachably locked to a locking fitting 38 provided inside the tunnel lining mold 10. . The fixing wire 36 is fixed to the locking bracket 38 so that the rod-like vibrator 20 does not move to the end form frame 16 side, and the locking state to the locking bracket 38 is released. As the rod-shaped vibrator 20 is pulled, it is pulled toward the end form 16 side.

  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 25 filled in the lining space 23, resists the frictional force (adhesive force) with the concrete 25, together with the rod-shaped vibrator 20, and the wife mold 16. Has enough tensile strength to pull to the side.

  The rod-shaped vibrator 20 and the vibrator cable 19 are supported by guide pieces 35 that protrude from the outer peripheral surface of the tunnel-covering formwork 10 so as to protrude and retract and are arranged in series at intervals in the axial direction X of the tunnel. It is held at an intermediate portion in the thickness direction of the lining space 23. Here, as the guide piece 35, for example, a fixed guide piece having a detachable loose fitting fixing function such as the vibrator cable 19 described in Japanese Patent Application Nos. 2007-71037 and 2007-71040 relating to the application of the present applicant is preferable. Can be used.

  As the winding device 34 that pulls the rod-shaped vibrator 20 and the vibrator cable 19 toward the end form frame 16, various known winding devices such as a cable reel can be used. The winding device 34 preferably has a function capable of measuring a pulling load and a pulling load when the vibrator cable 19 is pulled.

  In the present embodiment, the fluidized concrete 25 is press-fitted into the lining space 23 of the tunnel crown portion 13 from, for example, a concrete inlet 24 provided in the existing lining concrete 15 side portion of the tunnel lining formwork 10. Is done. The concrete charging port 24 is provided to be opened on the outer peripheral surface of the tunnel lining mold 10 by incorporating, for example, a known charging port unit 28 into the top end portion of the tunnel lining mold 10. The insertion port unit 28 includes a unit base (not shown) in which the insertion port 24 is opened, an opening / closing lid 26 that is rotatably joined to the unit base and opens / closes the insertion port 24, and the opening / closing movement of the opening / closing lid 26. A guide part (not shown) for guiding the pipe, a pipe joint part 31 to which a placement pipe 33 (see FIG. 1C) from the concrete pump is connected, and a jack part (not shown) for driving the opening / closing lid 26 to open and close. Etc.), and the concrete charging port 24 can be opened and closed by the opening / closing lid 26 by expanding and contracting the jack portion.

  In order to fill the lining space 23 of the tunnel crown portion 13 with the concrete 25 by the tunnel lining concrete placing method of the present embodiment, prior to the concrete 25 being charged from the concrete charging port 24, FIG. As shown in FIG. 4, the winding device 34 is slightly rotated to wind up the vibrator cable 19 and retract to the end form frame 16 side, whereby tension is applied to the rod-like vibrator 20 and the vibrator cable 19 whose tip is fixed by the fixing wire 36. Is granted.

  As a result, the rod-like vibrator 20 and the vibrator cable 19 hold a state of being pulled in a straight line at an intermediate portion in the thickness direction of the lining space 23 and fill the lining space 23 as will be described later. When the concrete 25 is compacted, the frictional force with the surrounding concrete 25 is reduced, and the rod-like vibrator 20 and the vibrator cable 19 can be pulled into the end frame 16 side more smoothly.

  Here, it is preferable that the tension force when applying tension to the rod-shaped vibrator 20 and the vibrator cable 19 is 0.5 to 1.0 kN. If the tension force at the time of applying the tension is too small, the vibrator cable 19 will bend and meander by the flow of the concrete 25, resulting in a disadvantage that the pull-out load increases, and the tension force at the time of applying the tension. If it is too large, the guide piece 35 and the locking bracket 38 are damaged, and the end surface 15a of the existing lining concrete 15 to which the wire guide 37 is fixed is damaged. Moreover, if it confirms that the tension | tensile_strength became 0.5-1.0kN preferably and the winding by the winding device 34 will be stopped, linearity will be ensured by this, and the rod-shaped vibrator 20 and the vibrator cable 19 will be ensured. At the same time, it is installed in the lining space 23 of the tunnel crown 13 in a state of being firmly fixed so as not to move from the set position.

  Next, as shown in FIG. 2 (b), the concrete 25, which is pumped from the concrete charging port 24 via the concrete pump, is supplied to the tunnel crown 13 while maintaining the tension to the rod-like vibrator 20 and the vibrator cable 19. The lining space 23 is filled.

  When the concrete 25 is filled in the lining space 23 and, for example, it is confirmed that the concrete 25 leaks from the confirmation hole in the upper part of the end form 16, the pumping of the concrete 25 is stopped as shown in FIG. Then, the concrete inlet 24 is closed by the opening / closing lid 26. Further, the winding device 34 is slightly rotated to unwind the vibrator cable 19 to release the tension, and the fixing wire 36 attached to the tip of the rod-like vibrator 20 is detached from the locking metal fitting 38 to remove the rod-like vibrator 20. The vibrator cable 19 is moved to the end form 16 side.

  Thereafter, as shown in FIG. 2 (d), the guide cable 35 is retracted to the inside of the tunnel lining mold 10 and the rod-like vibrator 20 is vibrated while the vibrator cable 19 is connected to the rod-like vibrator 20 by the winding device 34. At the same time, it is pulled at a predetermined speed and moved to the end form 16 side. As a result, the concrete 25 filled in the lining space 23 of the tunnel crown 13 is sufficiently compacted by the vibration of the rod-like vibrator 20.

  And according to the tunnel lining concrete placement method of the present embodiment performed as described above, when the concrete 25 is filled in the lining space 23 of the tunnel crown portion 13, the vibrator cable 19 is not bent or meandered. By ensuring the linearity so as not to occur, it is possible to reduce the pull-out load when pulling the vibrator cable 19 together with the rod-shaped vibrator 20 toward the end frame 16 side, and the concrete 25 can be compacted smoothly. become.

  That is, according to the present embodiment, the vibrator cable 19 is linearly pulled by applying tension to the vibrator cable 19 prior to filling the lining space 23 of the tunnel crown 13 with the concrete 25. Since the state is maintained, especially in the portion between the guide pieces 35, the vibrator cable 19 is moved from a predetermined set position by its own weight at the time of setting or the weight of the filled concrete 25 in a flowing state. The linearity can be firmly maintained without moving or causing deflection or meandering. Moreover, since the linearity of the rod-like vibrator 20 and the vibrator cable 19 is maintained in the filled concrete, the pulling resistance when the vibrator cable 20 is pulled to the end form frame 16 side together with the vibrated rod-like vibrator 19 is reduced. Thus, the concrete 25 can be compacted smoothly without causing the vibrator cable 20 to break or break.

  FIG. 3 illustrates a tunnel lining concrete placing method according to another embodiment of the present invention. According to the tunnel lining concrete placement method of FIG. 3, the rod-like vibrator 20 is detachably fixed by the guide piece 35 located at the end portion on the existing lining concrete 15 side, and close to the existing lining concrete 15. Installed. Also by the tunnel lining concrete placing method of FIG. 3, the vibrator cable 20 is pulled toward the end frame 16 side in a state where the rod-like vibrator 20 is fixed, thereby applying tension to the vibrator cable 20. The same effect is obtained.

  FIG. 4 illustrates a tunnel lining concrete placing method according to still another embodiment of the present invention. According to the tunnel lining concrete placement method of FIG. 4, for example, a tensile wire is attached to the tip of the rod-like vibrator 20 as the tensile wire member 39, and the wire winding device 40 provided inside the tunnel lining form 10 or Using a chain block or the like, the rod-like vibrator 20 is drawn into the existing lining concrete 15 side through the tension member 39, so that the tension is applied to the vibrator cable 19 without moving the winding device 34 that winds up the vibrator cable 19. Is supposed to be granted. Also by the tunnel lining concrete placing method of FIG. 4, tension is applied to the vibrator cable 20, and the same effect as the above embodiment is achieved.

  The present invention is not limited to the above-described embodiments, 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, methods other than those described in the above embodiments can be adopted as means for applying tension to the vibrator cable.

〔Example〕
Example 1 of tunnel lining concrete placement method according to the present invention in which tension is applied to the vibrator cable prior to the concrete being introduced from the concrete inlet, and Comparative Example 1 in which the tension is not applied to the vibrator cable. As for the tunnel lining concrete placing method, the pulling load when pulling from the concrete filled with the vibrator cable together with the rod vibrator while vibrating the rod vibrator was measured and compared. The measurement results are shown in FIG.

  According to the measurement results shown in FIG. 5, in the tunnel lining concrete placing method of Example 1 in which the vibrator cable was tensioned and then filled with concrete, the tunnel covering of Comparative Example 1 in which concrete was filled without tensioning the vibrator cable. It can be seen that the pull-out load is reduced to about 1/3 than the method of placing concrete.

(A)-(c) demonstrates the work procedure of the tunnel lining concrete placement operation | work where the tunnel lining concrete placement method which concerns on one Embodiment of this invention is employ | adopted, A part is shown as sectional drawing. It is a side view. (A)-(d) is principal part schematic cross-section explaining the operation | work process which places concrete in the lining space of a tunnel crown part using the tunnel lining concrete placement method which concerns on one Embodiment of this invention. FIG. It is principal part schematic sectional drawing explaining the tunnel lining concrete placement method which concerns on other embodiment of this invention. It is principal part schematic sectional drawing explaining the tunnel lining concrete placement method concerning other embodiment of this invention. It is a chart which shows the measurement result of the drawing load in the comparative experiment of the tunnel lining concrete placement method of Example 1, and the tunnel lining concrete placement method of Comparative Example 1. (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. It is a schematic perspective view explaining the prior art which guides a vibrator cable with a guide piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Formwork for tunnel lining 11 Covering concrete 12 Tunnel 13 Tunnel crown 15 Existing lining concrete 16 End form 19 Vibrator cable 20 Bar-shaped vibrator 22 Covering surface 23 Covering space 24 Concrete inlet 25 Winding concrete 34 Removing device 35 Guide piece 36 Fixed wire 37 Wire guide 38 Locking bracket 39 Tensile wire member (tensile wire)
40 Wire winding device X Tunnel axial direction

Claims (3)

In the tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork, the outer periphery of the tunnel lining formwork is sandwiched between the existing lining concrete and the end formwork. In the lining space of the tunnel crown between the surface and the lining surface on 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 frame When the concrete cable is filled in the lining space of the tunnel crown, the vibrator cable is connected to the vibrator cable together with the rod-like vibrator. It is a concrete placement method in which the concrete is pulled by pulling on the side of the end formwork and the filled concrete is compacted,
Prior to an operation of filling the lining space of the tunnel crown with concrete, a tunnel lining concrete placement method for maintaining a state where the vibrator cable is pulled straight by applying tension to the vibrator cable. .   The tension according to claim 1, wherein tension is applied to the vibrator cable by pulling the vibrator cable toward the end form frame side in a state where the rod-like vibrator is detachably fixed in proximity to the existing lining concrete. Tunnel lining concrete placement method.   The tunnel lining according to claim 1, wherein tension is applied to the vibrator cable by attaching a tensile wire member to a tip of the rod vibrator and pulling the rod vibrator toward the existing lining concrete by the tensile wire member. Concrete placement method.