JP2014080811A - Concrete placement system and its method for performance space at tunnel crest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete placement system which is most suitable for the performance space 3C at a tunnel crest part.SOLUTION: A concrete placement system in this invention comprises: a concrete placement pipe 10, which extends along the axial direction of a tunnel, having a discharge port at its tip; a placement-pipe feeding device 20, which supports the base end side of the concrete placement pipe 10, and pushes the tip of the concrete placement pipe 10 along the axial direction of the tunnel from the outside of a performance space 3C at the crest part of the tunnel into the inside, or pulls the same out from the performance space by penetrating an end plate 8; a through hole 70 which is formed on the end plate 8 to let the concrete placement pipe 10 run through; and a shutter which can close the through hole 70 upon the concrete placement pipe 10 being pulled out.

Description

  The present invention relates to a system and method for placing lining concrete on a tunnel crown. In other words, the present invention relates to a concrete placement technique in a lining space between a tunnel inner peripheral surface and a mold frame opposed to the tunnel, particularly a tunnel crown portion (crown portion, top end portion).

  For example, in a mountain tunnel, a tunnel lining formwork called a centle is generally used as a method for forming tunnel lining concrete that is built to cover the ground on the inner peripheral surface of an excavated tunnel. It has been adopted.

  Here, of the lining space between the tunnel inner peripheral surface and the mold opposite to it, the left and right tunnel side walls and the arch-shaped part are made of concrete using inspection windows provided in the mold. As for the tunnel crown, concrete is cast by a blow-up method from the inlet provided at the top end of the formwork.

Patent Document 1 discloses a tunnel for obtaining high-quality lining concrete by filling concrete with high filling pressure in the lining space of the tunnel crown as a tunnel crown blowing-up technique. A method for placing lining concrete is disclosed.
This is because concrete is pressed into the lining space at the crown of the tunnel between the outer peripheral surface of the tunnel lining formwork and the inner lining surface of the tunnel from a concrete inlet with a rotary opening / closing lid. This is a method of managing the pressure of the concrete filled in the tunnel crown using a pressure gauge when placing. In particular, a plurality of the pressure gauges are arranged at intervals in the tunnel axial direction at the tunnel crown portion of the tunnel lining formwork, and the concrete is measured until the filling pressure state measured by these is in a predetermined state. Pumping is performed, and then pumping is stopped.

Patent Document 2 discloses a mobile driving device that is not used for driving the tunnel crown but is used for driving the left and right tunnel side walls and the arch-shaped portion.
This is provided with transfer means for moving a concrete supply device (movable supply pipe and connection pipe) for supplying concrete to a mold disposed in the tunnel in the longitudinal direction of the tunnel. Here, the movable supply pipe is supported by wheels so that it can move along the rail in the longitudinal direction of the tunnel. The connecting pipe is placed on a guide stand, and guide rollers for supporting the guide stand are arranged in parallel in the longitudinal direction of the tunnel at the top of the mold.

JP 2009-127230 A JP2012-112200A

  When the tunnel crown is driven by the blow-up method, concrete is insufficiently filled. Also, when the concrete pumped by the pipe moves after being discharged into the formwork, material separation (for example, relatively small aggregate in the concrete is advanced and the relatively large aggregate is brought forward. A phenomenon in which the distribution of the constituent materials of the fresh concrete becomes non-uniform during placement, such as staying. The tendency of material separation appears more prominently as the moving distance of concrete increases. When material separation occurs, it may cause insufficient strength due to non-uniformity or poor finish (color unevenness).

  On the other hand, although the technique described in Patent Document 1 manages the filling pressure using a pressure gauge, since it is a blow-up type to the last, insufficient filling tends to occur. In addition, since the position of the concrete inlet is constant, material separation occurs when the concrete moves from the concrete inlet to the lining space.

  Moreover, although the technique of patent document 2 is not for the placement of a tunnel crown, it is difficult to use this for the placement of a tunnel crown. Since the technique described in Patent Document 2 is used for placing the left and right tunnel side wall portions and the arch-shaped portion, the concrete supply device moves in the tunnel crown portion but is always located in the lining space. For this reason, it is difficult to place concrete in the entire lining space of the tunnel crown part, in other words, to the inner surface of the end plate (wife formwork) that partitions the inside and outside of the lining space.

  In view of such a situation, it is an object of the present invention to provide a tunnel crown lining concrete placement system and method that are optimal for tunnel crown placement.

Tunnel crown lining concrete placement system according to the present invention,
A concrete placement pipe extending along the tunnel axis direction and having a discharge port at the tip;
Supporting the base end side of the concrete placing pipe, the forward end of the concrete placing pipe is moved forward and backward in the tunnel axial direction through the end plate from the outside of the tunnel crown lining space. A casting tube feeder;
A through hole provided in the end plate and penetrating the concrete placing pipe;
A shutter capable of closing the through hole when the concrete placing pipe is pulled out from the through hole;
It is comprised including.

The tunnel crown lining concrete placing method according to the present invention is as follows.
Supporting the base end side of the concrete placement pipe extending along the tunnel axis direction and having a discharge port at the tip end, and covering the tunnel crown portion with the tip end portion of the concrete placement pipe in the tunnel axis direction A step of moving forward through the through hole of the end plate from the outside of the space,
Retreating the concrete placing pipe while placing concrete in the lining space by the concrete placing pipe;
Simultaneously pulling out the tip of the concrete placement pipe from the through hole by retreating the concrete placement pipe, and simultaneously closing the through hole with a shutter to finish placing the lining concrete;
It is comprised including.

  According to the present invention, it is possible to place the discharge port of the placement tube by moving it to the position close to the placement portion, and to reduce insufficient filling. Moreover, the movement of the concrete during placement can be suppressed, and as a result, the material separation of the concrete can be reduced.

  In addition, by pulling out the concrete placement pipe from the through hole of the end plate by retreating the concrete placement pipe, and simultaneously closing the through hole with the shutter, to the entire lining space of the tunnel crown, that is, to the inner surface of the end plate, Concrete can be placed at a necessary and sufficient filling pressure, and the filling performance can be improved.

The side view of the tunnel which shows the tunnel crown part lining concrete placement system which concerns on one Embodiment of this invention Sectional view of the tunnel as seen from the face side (wife side) showing the system Top view of the tunnel showing the system Side view of the tunnel showing the pulled-out state of the installed pipe in the system Enlarged side view of the main part of the casting pipe feeder The figure which shows the specific example of the piping support member by the placement pipe feeder side The figure which shows the specific example of the piping support member by the side of a formwork Side view of tunnel crown showing arrangement of piping support members on mold side The figure which shows the hole filling state of the piping support member by the side of a formwork Front view of Tsumabate Cross section of the end plate

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a side view of a tunnel showing a tunnel crown lining concrete placement system according to an embodiment of the present invention, the left side of the figure is the wellhead side (lining space wrap side), and the right side of the figure is the face side ( Lining space wife side). Also, when referring to “front and back,” seeing the direction of insertion of the concrete placement pipe into the lining space (inserted from the wife side to the lap side), the lap side (left side in the figure) is the front side and the wife side (right side in the figure) ) Is the rear side. 2 is a sectional view of the tunnel as seen from the face side (wife side) showing the system, and FIG. 3 is a plan view of the tunnel showing the system. FIG. 4 is a side view of the tunnel showing the pulled-out state of the casting tube in the system.

  The tunnel of this embodiment is a mountain tunnel, and the tunnel inner peripheral surface 1 is primarily supported by sprayed concrete or the like after tunnel excavation by blast excavation. Then, the mold frame 2 is set so as to be opposed to the inner peripheral surface 1 of the tunnel, and a lining space 3 for placing concrete is formed between the inner peripheral surface 1 of the tunnel and the mold frame 2. A gantry vehicle 6 that can move on a rail 5 laid on a tunnel bottom (invert) 4 is used for setting the formwork 2.

  The formwork 2 is also called “covering centle”, and a plurality of formwork members (for example, seven pieces) having a predetermined width (for example, 1.5 m) in the tunnel axis direction are connected in the tunnel axis direction to form one span (for example, 10 .5m). Each formwork member is appropriately divided in the circumferential direction and used in combination.

  In the figure, a seven-span mold 2 is constituted by seven mold members 2A to 2G in the tunnel axis direction, and a lining is provided between the tunnel inner peripheral surface 1 and the one-span mold 2 (2A to 2G). A lining space 3 for placing concrete is formed. And this lining space 3 refers to FIG. 2, and the left and right tunnel side wall portions (covering space of the tunnel side wall portion) 3A, 3A, and the left and right arch shape portions (the lining space of the arch shape portion). ) 3B and 3B and a central tunnel crown (tunnel lining space) 3C. Among these, the right and left tunnel side wall portions 3A, 3A and the arch-shaped portions 3B, 3B are appropriately inspected in which the concrete placing pipe (not shown) provided in the gantry vehicle 6 is provided in the formwork 2. The concrete is placed by inserting into the lining space 3 from a window (not shown) and pumping the concrete. Thereafter, concrete is placed in the tunnel crown 3C using the tunnel crown lining concrete placement system according to the present invention.

  Therefore, when concrete is placed in the tunnel crown 3C using the tunnel crown lining concrete placement system according to the present invention, the lining space of the formwork on the face side from the formwork members 2A to 2G. The concrete has already been cast from the left and right tunnel side wall portions 3A and 3A and the arch-shaped portions 3B and 3B to the tunnel crown portion 3C, and the tunnel crown portion 3C is excluded from the lining space 3 of the formwork members 2A to 2G. It is assumed that concrete has already been placed on the left and right tunnel side wall portions 3A and 3A and the arch shape portions 3B and 3B.

  Further, the end portion (lap side) in the tunnel axis direction of the lining space 3 of the formwork members 2 </ b> A to 2 </ b> G is closed by the existing concrete 7. On the other hand, the face side end portion (wife side) in the tunnel axis direction of the lining space 3 of the formwork members 2A to 2G is closed by a closing plate 8.

  The tunnel crown lining concrete placement system of this embodiment includes a tunnel crown (tunnel crown) in the lining space 3 between the tunnel inner peripheral surface 1 and the mold 2 (formwork members 2A to 2G). Lining space) 3C for lining concrete, a concrete placement pipe 10 for a tunnel crown, a placement pipe feeding device 20 for moving the placement pipe 10, and a placement pipe feeding apparatus. 20, a carriage 40 equipped with 20, a pipe support member 50 that supports the distal end side of the casting pipe 10 on the casting pipe feeder 20 side, and a piping that supports the distal end side of the casting pipe 10 on the mold 2 side. And a support member 60.

  The concrete placing pipe 10 is a straight pipe extending along the tunnel axis direction, and has a discharge port at the tip. The base end portion of the placement tube 10 is bent and supported by a travel base 25 of the placement tube feeder 20 described later. The concrete supply pipe connected to the base end of the placing pipe 10 will be described later.

  The placement pipe feeding device 20 is arranged outside the lining space 3C of the tunnel crown, supports the proximal end portion of the concrete placement pipe 10, and the distal end portion of the concrete placement pipe 10 in the tunnel axial direction. Move forward and backward from the outside (wife side) to the inside (lap side) of the lining space 3C of the tunnel crown.

The placement pipe feeder 20 is mounted on the carriage 40.
The carriage 40 is a portal-type vehicle that is disposed behind the gantry vehicle 6 and is movable on the rail 5 at the bottom 4 of the tunnel, like the gantry vehicle 6. Is equipped. Further, a dump truck, a mixer truck, or the like can be passed through the internal space of the portal-type carriage 40.

  The placement pipe feeding device 20 is attached to a top plate 41 of a carriage 40 and a pair of front and rear first bases 21 and 21 and is mounted on the first bases 21 and 21 so that the position can be adjusted in the lateral direction (tunnel crossing direction). A pair of front and rear second bases 22 and 22, a pair of front and rear extension jacks 23 and 23 for vertical position adjustment that are erected on the second bases 22 and 22, and upper ends of the jacks 23 and 23 are supported. A guide rail member 24 extending in the front-rear direction (tunnel axis direction), a travel base 25 movable in the front-rear direction along the guide rail member 24, and a base of the concrete placing pipe 10 attached to the travel base 25 And a holder 26 that holds the end.

FIG. 5 is an enlarged side view of a main part of the placing pipe feeding device 20, and shows a guide rail member 24, a traveling frame 25, a holder 26, and the like.
Sprockets 27 and 28 are arranged near the front end portion and the rear end portion of the guide rail member 24, respectively, and a chain 29 is wound around these sprockets 27 and 28 in an endless manner. The traveling frame 25 is hooked at one place of the chain 29. A motor 30 is arranged in the vicinity of the sprocket 28 on the rear end side, and the sprocket 28 can be driven to rotate via the bevel gear 31 by the output shaft of the motor 30.

  Therefore, the traveling base 25 can be moved along the guide rail member 24 via the chain 29 by rotating the sprocket 28 by the motor 30, and the traveling base 25 can be moved by the normal rotation of the motor 30. The traveling platform 25 can be moved backward by moving forward and reversing the motor 30.

  Here, the traveling frame 25 supports the base end portion of the concrete placing pipe 10 via the holder 26. Therefore, the concrete placement pipe 10 can be moved forward or backward as the traveling frame 25 is moved forward or backward by the motor 30. Then, by the forward movement of the concrete placement pipe 10, the tip of the concrete placement pipe 10 is inserted into the lining space 3C of the tunnel crown and reaches the innermost part of the lining space 3C (near the existing concrete 7). (See FIG. 1). From this state, the concrete placement pipe 10 can be pulled out of the lining space 3C by the backward movement of the concrete placement pipe 10 (see FIG. 4).

  Further, as shown in FIG. 5, a cylinder-type pressure sensor 32 is interposed in the middle of a chain 29 that pulls the traveling frame 25. Specifically, a pressure sensor 32 is interposed between the traveling gantry 25 and a chain 29a (on the sprocket 27 side) hooked on the front side thereof. When concrete is placed in the lining space 3 </ b> C by the concrete placement pipe 10 and a concrete filling pressure is applied to the tip of the concrete placement pipe 10, a reaction force is applied to the traveling platform 25 via the concrete placement pipe 10. As a result, a tensile force acts on the chain 29a on the sprocket 27 side, and hence on the cylinder type pressure sensor 32. Therefore, the pressure sensor 32 can detect the concrete filling pressure near the tip of the concrete placing pipe 10.

Next, the pipe support member 50 that supports the distal end side of the concrete placing pipe 10 on the placing pipe feeding device 20 side will be described. FIG. 6 is a view showing a specific example of the pipe support member 50 on the placement pipe feeder 20 side.
The pipe support members 50 can be attached to a plurality of locations (for example, three locations) in the longitudinal direction of the guide rail member 24 of the placement tube feeder 20.

  As shown in FIG. 6, the pipe support member 50 includes a drum-shaped roller 51 that supports the concrete placing pipe 10 from below, and a support body 52 that supports the roller 51 rotatably and extends vertically. The support body 52 is attached to the guide rail member 24 so that its position can be changed. Here, the support body 52 protrudes upward from the guide rail member 24 as shown in FIG. 6A, and supports the concrete placing pipe 10 by the roller 51, as shown in FIG. 6B. It is possible to take the second position where the guide rail member 24 is submerged and retracted. In the second position, the movement of the traveling frame 25 on the guide rail member 24 is not hindered.

Next, the pipe support member 60 that supports the distal end side of the concrete placing pipe 10 on the mold 2 side will be described. FIG. 7 is a view showing a specific example of the pipe support member 60 on the mold 2 side.
Pipe support members 60 can be attached to the mold 2 at a plurality of locations (for example, 4 locations) in the tunnel axis direction at the tunnel crown.

  The pipe support member 60 includes a central first rod 61 and second and third rods 62 and 63 on both sides, and is attached to the mold frame 2 from the inner peripheral surface side.

The first rod 61 holds a guide roller 64 rotatably at its upper end. The guide rotor 64 is smaller than the rod diameter of the first rod 61 and is sized to fit within the diameter of the first rod 61 when viewed in the axial direction of the first rod 61.
The first rod 61 is inserted from below into a hole provided in the mold 2, specifically, a cylindrical body 65 fixed to the inner peripheral surface side of the mold 2, and enters the lining space 3 </ b> C, The concrete placing pipe 10 is supported by the guide roller 64 at the upper end.

  The second and third rods 62 and 63 are slightly longer than the first rod 61. The second and third rods 62 and 63 are inserted from below into the holes provided in the mold 2, specifically, the cylindrical bodies 66 and 67 fixed to the inner peripheral surface of the mold 2, It enters the space 3C, and its upper end is located on the left and right sides of the concrete placing pipe 10 supported by the guide roller 64 of the first rod 61, thereby preventing the concrete placing pipe 10 from dropping off from the guide roller 64. To do.

  The first rod 61 is fixed by a fixing pin 65a that penetrates the cylindrical body 65 and the first rod 61 in the radial direction. Here, the first rod 61 is provided with a plurality of pin holes through which the pin 65a can penetrate in the axial direction, and by selecting these, the entry position of the first rod 61 into the lining space 3C can be adjusted. .

The same applies to the second rod 62. The second rod 62 is fixed by a fixing pin 66a that penetrates the cylindrical body 66 and the second rod 62 in the radial direction. By selecting the pin hole, the second rod 62 is inserted into the lining space 3C. The approach position can be adjusted.
The same applies to the third rod 63, and is fixed by a fixing pin 67a that penetrates the cylindrical body 67 and the third rod 63 in the radial direction. By selecting a pin hole, the third rod 63 enters the lining space 3C. The approach position can be adjusted.

  FIG. 8 is a diagram showing the arrangement of the pipe support members 60 on the mold 2 side. As can be seen from this figure, the position of the first rod 61 and the second and third rods 62 and 63 are shifted in the tunnel axis direction. In other words, the cylindrical body 65 and the cylindrical bodies 66 and 67 are shifted in position in the tunnel axis direction. This is to ensure a gap in the width direction.

  FIG. 9 is a diagram illustrating a state where the pipe support member 60 on the mold 2 side is filled. As can be seen from this figure, after the first to third rods 61 to 63 are removed from the cylindrical bodies 65 to 67, the holes of the cylindrical bodies 65 to 67 can be closed by the filling members 65b, 66b, 67b. It is like that. The hole filling members 65b, 66b, and 67b are also fixed by the fixing pins 65a, 66a, and 67a.

Next, the configuration of the 8 parts of the end plate will be described. FIG. 10 is a front view of 8 parts of the end plate, and FIG. 11 is a cross-sectional view of the 8 part of the end plate.
A through-hole 70 through which the concrete placing pipe 10 passes is formed in the end plate (end form) 8 that closes the end side of the lining space 3C. Further, a guide tube 71 is attached to the end plate 8 so as to continue to the through hole 70. The guide tube 71 is connected to the through hole 70 of the end plate 8 and protrudes from the end plate 8 to the outside of the lining space 3C, and has an inner diameter into which the concrete placing tube 10 can be inserted. Further, for example, a brush-like seal member 72 that is in sliding contact with the concrete placing pipe 10 is provided on the inner peripheral portion of the guide pipe 71.

Further, a shutter 73 that can close the through hole 70 when the concrete placing pipe 10 is pulled out from the through hole 70 is provided for the through hole 70 of the end plate 8.
The shutter 73 is provided between the outer surface of the end plate 8 and the flange portion of the guide tube 71, and has a plate-like slide gate 74 that opens and closes the through hole 70, and a guide member that guides the slide gate 74 so as to be slidable. 75. Therefore, the guide member 75 includes the outer surface of the end plate 8 and the flange portion of the guide tube 71. The guide member 75 is provided with, for example, a brush-like seal member 76 that is in sliding contact with the slide gate 74.

  The slide gate 74 can be manually moved up and down. In the lower position, as shown in FIG. 11A, the through hole 70 (and the guide tube 71) is opened, and the positioning is performed by the lock member 78 engaged with the lower engagement portion 77a. In the upper position, as shown in FIG. 11B, the through hole 70 (and the guide tube 71) is closed and positioned by a lock member 78 engaged with the upper engaging portion 77b. The movement of the slide gate 74 may be performed using a hydraulic jack or a journal jack in addition to human power.

Next, the concrete supply pipe to the concrete placing pipe 10 will be described.
Referring to FIGS. 1 to 3, the concrete supply pipe to the concrete placement pipe 10 is a first connection pipe 11, a second connection pipe 12, and a third connection pipe from the concrete placement pipe 10 side to the supply source side. 13 and the fourth connecting pipe 14.

The base end portion of the concrete placing pipe 10 is bent in the lateral direction and then bent downward to form a downward first connecting portion 81.
The first connecting pipe 11 has an intermediate portion arranged in the horizontal direction, and one end side is bent upward, and is connected to the concrete placing pipe 10 by the first connecting portion 81 so as to be rotatable. The other end side of the first connecting pipe 11 is bent upward to form a second connecting portion 82.

  The second connecting pipe 12 has an intermediate portion arranged in a horizontal direction (a position higher than the first connecting pipe 11), one end side is bent downward, and is rotatable with the first connecting pipe 11 at the second connecting portion 82. It is linked to. The other end side of the second connecting pipe 12 is bent downward to form a third connecting portion 83.

  The third connecting pipe 13 has a middle portion fixed in the horizontal direction and in the longitudinal direction of the carriage 40 (lower position than the second connecting pipe 12), and one end side is bent upward, and the third connecting section 83 The second connection pipe 12 is rotatably connected. The other end side of the third connecting pipe 13 is bent downward and penetrates the top plate 41 of the carriage 40 to form a fourth connecting portion 84.

  The fourth connecting pipe 14 is connected to the fourth connecting portion 84 of the third connecting pipe 13, extends into the internal space of the portal-type carriage 40, and is connected to a concrete supply source (not shown).

  Therefore, referring to FIG. 3, when the concrete placing pipe 10 is advanced by the advancement of the traveling gantry 25, the second connecting pipe 12 is illustrated with a solid connecting line (third connecting part 83) connected to the third connecting pipe 13 as a solid line. The first connecting pipe 11 is displaced between the second connecting pipe 12 and the concrete placing pipe 10 following the rotation.

  Further, when the concrete placing pipe 10 is retracted due to the retreat of the traveling base 25, the second connecting pipe 12 is centered on the connecting portion (third connecting portion 83) with the third connecting tube 13 as shown by the dotted line in FIG. The first connecting pipe 11 is displaced between the second connecting pipe 12 and the concrete placing pipe 10 following the rotation. FIG. 4 is a side view of the state shown by the dotted line in FIG.

  Thereby, the advance / retreat of the concrete placing pipe 10 due to the advance / retreat of the traveling frame 25 can be absorbed by the displacement of the first and second connecting pipes 11, 12 in the horizontal plane.

Next, a tunnel crown lining concrete placement method using the tunnel crown lining concrete placement system of this embodiment will be described.
When placing lining concrete in the lining space 3C at the crown of the tunnel, the sprocket 28 is rotated from the state shown in FIG. The traveling frame 25 is moved forward on the rail member 24. Then, as shown in FIG. 1, the concrete placement pipe 10 supported by the traveling base 25 is advanced by the advancement of the travel base 25, and the tip of the concrete placement pipe 10 is inserted into the guide pipe 71 of the end plate 8 part. Then, the through hole 70 is penetrated to enter the lining space 3C. Finally, the tip of the concrete placing pipe 10 is made to reach the vicinity of the innermost part of the lining space 3C (near the existing concrete 7).

  At this time, when the traveling base 25 moves forward on the guide rail member 24, the concrete placing pipe 10 is guided on the guide rail member 24 by the pipe support member 50 as shown in FIG. As shown in FIG. 1, the pipe support member 50 that has been guided with the forward movement is changed from the guide position to the retracted position.

  On the other hand, on the side of the mold 2, the piping support member 60 attached to the mold 2 is moved from the state of FIG. 4 to the inside of the lining space 3 </ b> C as the concrete placing pipe 10 advances in the lining space 3 </ b> C. The concrete placement pipe 10 is guided as shown in FIG.

  When the concrete placement pipe 10 has moved to the innermost part, the concrete is pumped from the concrete supply source and discharged from the tip of the concrete placement pipe 10 to put the concrete into the lining space 3C of the tunnel crown. Start installation.

  When the concrete filling pressure in the vicinity of the distal end portion of the concrete placement pipe 10 increases with the concrete placement in the lining space 3 </ b> C, this is detected by the pressure sensor 32. That is, as a result of the concrete filling pressure acting on the concrete placing pipe 10 and trying to retreat the concrete placing pipe 10, a tensile force is applied to the chain 29 a (FIG. 5) via the traveling frame 25. Is detected by the pressure sensor 32. Therefore, every time the concrete filling pressure reaches a predetermined value, the lining concrete can be placed with a predetermined filling pressure by reversing the motor 30 little by little and retreating the concrete placing pipe 10.

With the retreat of the concrete placing pipe 10 in the lining space 3C, the pipe support members 60 (first to third rods 61, 62, 63) that have finished the guiding action are sequentially withdrawn from the lining space 3C, By filling the holes of the cylindrical bodies 65 to 67 with the hole filling members 65b to 67b, the concrete filling is not disturbed.
On the other hand, on the side of the guide rail member 24, the pipe support member 50 is sequentially projected to exert a guiding action on the concrete placing pipe 10.

  Eventually, with the completion of filling of the concrete into the lining space 3C, the concrete placement pipe is pulled out from the lining space 3C.

  At this time, as shown in FIGS. 11 (a) → (b), at the same time as the concrete placement pipe 10 is retracted from the through hole 70 of the end plate 8 by the backward movement of the concrete placement pipe 10, the shutter 73 ( The through hole 70 is closed by the slide gate 74), and the placement of the lining concrete is finished.

  Alternatively, the shutter 73 on the side of the guide plate 71 on the side of the end plate 8 in a state where the end of the concrete placement tube 10 is pulled out from the through hole 70 of the end plate 9 and positioned in the guide tube 71 by the backward movement of the concrete placement tube 10. The guide pipe 71 is closed by the (slide gate 74), and the placing of the lining concrete is finished. Thereafter, the distal end portion of the concrete placing pipe 10 is pulled out from the guide pipe 71.

  According to this embodiment, it is possible to place the discharge port of the concrete placing pipe 10 by moving it to the position close to the placing portion, and to reduce insufficient filling. Moreover, the movement amount of the concrete during placement can be suppressed, and as a result, the material separation of the concrete can be reduced.

  Moreover, if the concrete placement pipe 10 is moved with the progress of the placement while managing the concrete filling pressure, the filling pressure can be controlled more appropriately.

  Further, the concrete placement pipe 10 is pulled out from the through hole 70 of the end plate 8 by the backward movement of the concrete placement pipe 10, and at the same time, the through hole 70 is closed by the shutter 73 (slide gate 74), and the lining concrete is placed. By completing the above, concrete can be placed in all the lining space 3C of the tunnel crown, that is, up to the inner surface of the end plate 8 with a necessary and sufficient filling pressure, and the filling performance can be improved. In other words, it is possible to make the final driving into the lining space 3 </ b> C (placement near the end plate 8) more reliable.

  Further, according to the present embodiment, the concrete placing pipe 10 is connected to the through hole 70 of the end plate 8 and protrudes to the outside from the end plate 8, and is provided with the guide pipe 71 that guides the concrete placing pipe 10. If the through-hole 70 is closed by the shutter 73 (slide gate 74) while being pulled out from the through-hole 70 and positioned in the guide tube 71, the concrete filling pressure in the vicinity of the end plate 8 is reduced due to the extraction. Can be suppressed, and workability is also improved.

  That is, the guide tube 71 is moved by the shutter 73 (slide gate 74) on the side of the end plate 8 of the guide tube 71 in a state where the tip of the concrete tube 10 is positioned in the guide tube 71 by the backward movement of the concrete placement tube 10. Is closed and the laying of the lining concrete is finished, so that a decrease in the concrete filling pressure in the vicinity of the end plate 8 due to drawing can be suppressed, and workability is also improved.

  Further, according to the present embodiment, the shutter 73 is composed of the plate-like slide gate 74 that opens and closes the through hole 70 and the guide member 75 that guides the slide gate 74 so as to be slidable. With the configuration, it is possible to open and close smoothly.

  Further, according to the present embodiment, the guide pipe 71 has the seal member 72 in sliding contact with the concrete placing pipe 10 on the inner peripheral portion thereof, so that a gap between the guide pipe 71 and the concrete placing pipe 10 is obtained. It is possible to suppress the leakage of concrete and the decrease in filling pressure.

  In addition, according to the present embodiment, the guide member 75 of the shutter 73 includes the seal member 76 that is in sliding contact with the slide gate 74, thereby leaking or filling the concrete through the gap between the guide member 75 and the slide gate 74. The pressure drop can be suppressed.

  Further, according to the present embodiment, the placement pipe feeding device 20 is mounted on the carriage 40 and extends along the tunnel axis direction, and the guide rail member 24 is movable along the guide rail member 24 and is cast into the concrete. By including the traveling platform 25 that supports the base end portion of the installation pipe 10, the concrete installation pipe 10 can be reliably moved forward and backward.

  The illustrated embodiment is merely an example of the present invention, and the present invention is not limited to the embodiment described directly, but includes various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it is included.

DESCRIPTION OF SYMBOLS 1 Tunnel inner peripheral surface 2 Formwork 2A-2G Formwork member 3 Covering space 3A Tunnel side wall part (covering space of tunnel side wall part)
3B Arch shape part (lining space for arch shape part)
3C Tunnel crown (lining space of tunnel crown)
4 Tunnel bottom (invert)
5 rail 6 gantry wheel 7 existing concrete 8 end plate 10 concrete placing pipe 11 first connecting pipe 12 second connecting pipe 13 third connecting pipe 14 fourth connecting pipe 20 placing pipe feeding device 21 first base 22 second base 23 Jack 24 Guide rail member 25 Travel base 26 Holder 27, 28 Sprocket 29 Chain 30 Motor 31 Bevel gear 32 Pressure sensor 40 Dolly 41 Top plate 50 Piping support member 51 Roller 52 Support body 60 Piping support member 61 First rod 62 Second rod 63 Third rod 64 Guide rollers 65, 66, 67 Cylindrical bodies 65a, 66a, 67a Fixing pins 65b, 66b, 67b Filling member 70 Through hole 71 Guide tube 72 Seal member 73 Shutter 74 Slide gate 75 Guide member 76 Seal member 77a, 77b Locking part 78 Locking member 81 No. Connecting portion 82 a second connecting portion 83 third connecting portion 84 fourth connecting portion

Claims (8)

It is a system for placing lining concrete in the lining space of the tunnel crown out of the lining space between the inner peripheral surface of the tunnel and the formwork opposed thereto,
A concrete placement pipe extending along the tunnel axis direction and having a discharge port at the tip;
Supporting the base end side of the concrete placing pipe, the forward end of the concrete placing pipe is moved forward and backward in the tunnel axial direction through the end plate from the outside of the tunnel crown lining space. A casting tube feeder;
A through hole provided in the end plate and penetrating the concrete placing pipe;
A shutter capable of closing the through hole when the concrete placing pipe is pulled out from the through hole;
A tunnel crown lining concrete placement system composed of   2. The tunnel crown lining concrete according to claim 1, further comprising a guide pipe that is connected to a through-hole of the face plate and projects outward from the face plate and guides the concrete placing pipe. Placing system.   3. The tunnel crown according to claim 1, wherein the shutter includes a plate-like slide gate that opens and closes the through-hole, and a guide member that guides the slide gate in a slidable manner. Partial lining concrete placement system.   The tunnel lining concrete placement system according to claim 2, wherein the guide tube has a seal member in sliding contact with the concrete placement tube on an inner peripheral portion thereof.   4. The tunnel lining concrete placement system according to claim 3, wherein the shutter guide member includes a seal member that is in sliding contact with the slide gate.   The placing pipe feeding device includes a guide rail member that is placed on a carriage and extends in the tunnel axis direction, and a travel base that is movable along the guide rail member and supports a base end portion of the concrete placing pipe. The tunnel crown lining concrete placement system according to any one of claims 1 to 5, wherein the tunnel crown lining concrete placement system according to any one of claims 1 to 5 is configured. It is a method of placing lining concrete in the lining space of the tunnel crown out of the lining space between the inner peripheral surface of the tunnel and the formwork opposed thereto,
Supporting the base end side of the concrete placement pipe extending along the tunnel axis direction and having a discharge port at the tip end, and covering the tunnel crown portion with the tip end portion of the concrete placement pipe in the tunnel axis direction A step of moving forward through the through hole of the end plate from the outside of the space,
Retreating the concrete placing pipe while placing concrete in the lining space by the concrete placing pipe;
Simultaneously pulling out the tip of the concrete placement pipe from the through hole by retreating the concrete placement pipe, and simultaneously closing the through hole with a shutter to finish placing the lining concrete;
A tunnel crown lining concrete placing method comprising: It is a method of placing lining concrete in the lining space of the tunnel crown out of the lining space between the inner peripheral surface of the tunnel and the formwork opposed thereto,
Supporting the base end side of the concrete placement pipe extending along the tunnel axis direction and having a discharge port at the tip end, and covering the tunnel crown portion with the tip end portion of the concrete placement pipe in the tunnel axis direction A step of penetrating a guide tube protruding from the outside of the space to the through hole of the end plate and projecting outward from the end plate;
Retreating the concrete placing pipe while placing concrete in the lining space by the concrete placing pipe;
The guide tube is closed with a shutter on the side face of the guide tube while the tip of the concrete placement tube is positioned in the guide tube by the backward movement of the concrete placement tube, and the lining concrete is cast. A step to finish the setting,
A tunnel crown lining concrete placing method comprising: