JP4624243B2 - Tunnel lining concrete placing method and wife formwork device - Google Patents

Description

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

  For example, in tunnel construction methods such as the mountain tunnel construction method, a method using a concrete lining formwork is generally 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. Has been adopted. As shown in FIGS. 3A and 3B, the concrete lining formwork 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. In the space 61 between the installed concrete lining formwork 50 and the natural ground covered with the sprayed concrete 56 on the inner peripheral surface 54 of the tunnel 53. The lining concrete is formed so as to be continuous with the concrete of the inverted portion 51 at the bottom of the tunnel, preferably by placing and hardening unreinforced concrete.

  As the concrete lining formwork 50, for example, a movable tunnel lining formwork called a slide centle is known in addition to an assembly type tunnel lining formwork called a paracentle. As the excavation work proceeds, the concrete lining formwork 50 is moved from the rear to the front in the digging direction of the tunnel 53 while re-installing the concrete lining formwork 50 every predetermined span of, for example, about 10 m. Then, the side and upper lining concrete of the tunnel 53 is sequentially cast and formed.

  Then, in order to place the lining concrete on the side and upper part of the tunnel using the concrete lining formwork 50, for example, as shown in FIGS. For example, an area from the side wall portion 55 of the tunnel 53 to the shoulder portion of the arch-shaped portion 52 is provided through the inspection window 56 as a height region where concrete can be placed from the inspection window 56 provided in the mold 50. The concrete 57 is supplied and the vibrator 58 is inserted from the inspection window 56, and the concrete 57 is placed while the supplied concrete 57 is compacted. After that, as the height region that is difficult to be compacted by the vibrator 58 while supplying the concrete 57 from the inspection window 56, the concrete is applied to the region of the crown portion (crown portion) 59 (see FIG. 3) of the tunnel 53. A pattern is used in which concrete is driven in by a blow-up method from a concrete casting hole 60 as a blow-up opening provided at the top end of the lining mold 50 and the concrete 57 of the crown 59 is formed without compaction. ing.

  More specifically, after the concrete lining formwork 50 is installed at a predetermined position, for example, the concrete 57 is poured from the lower portion of the side wall portion 55 through the lower inspection window 56 and compacted using the vibrator 58. (Refer to FIG. 4A) 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. 4 ( b)), and further to the front of the crown 59 of the arch-shaped portion 52, the concrete 57 is poured through the upper inspection window 56 and, if necessary, the concrete placement hole 60, and then compacted using the vibrator 58. Step (see FIG. 4 (c)) and the concretion sequentially from the portion of the crown 59 on the existing lining concrete 62 side through the concrete placement hole 60. Pouring the door 57, by a step of filling concrete to wife formwork 63 without compaction (see FIG. 4 (d)), so that the lining concrete is pouring.

  In the method of placing lining concrete using the conventional concrete 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 space 61 between the concrete lining formwork 50 and the natural ground by concentrating from the concrete placing hole 60 as a blow-up opening, the concrete 57 is removed from the concrete placing hole 60. The trajectory when flowing to the surroundings tends to remain on the surface of the lining concrete as a striped pattern, resulting in poor finish.

On the other hand, a technique is disclosed that enables the concrete placed in the tunnel crown to be compacted (see, for example, Patent Document 1). In the lining concrete placing method of Patent Document 1, when a tunnel is constructed by a shield method different from the mountain tunnel method, a guide rail extending in the tunnel axis direction is provided at the crown portion of the gap between the segment and the centle. A rod-shaped vibrator that moves along the guide rail is installed, and concrete is driven into the gap in the crown from the existing side while being compacted with the rod-shaped vibrator. The concrete is filled with the rod-shaped vibrator along the guide rail. In this way, it is made to move from the existing side toward the side of the end plate. Moreover, in the lining concrete placement method of patent document 1, a guide rail is provided also as a setup line of secondary lining concrete, for example.
JP 2002-30893 A

  However, in the method of placing concrete on the crown portion of the tunnel described in Patent Document 1, it is necessary to provide a guide rail that guides the rod-shaped vibrator in the tunnel axis direction in advance, so that a setup line or the like is installed. In a mountain tunnel or the like in which lining concrete is formed using unreinforced concrete, a lot of labor is required for the construction. In particular, the tunnel crown lining concrete has a considerable width, and in order to obtain the desired quality, a plurality of vibration compaction devices are used to spread the tunnel crown concrete over a wide range. If effective compaction is required, more work is required to install the guide rail.

  The present invention has been made paying attention to such a conventional problem, and a plurality of vibration compaction devices can be provided without previously providing a guide rail for guiding the vibration compaction device such as a vibrator in the tunnel axis direction. Can be used to place concrete supplied to the tunnel crown while effectively compacting the concrete over a wide range so that the desired quality can be obtained, and the wife mold An object is to provide a frame device.

  The present invention relates to a tunnel lining concrete placement method for forming lining concrete using a tunnel lining formwork, and when both sides of the lining concrete are placed to the lower side of the tunnel crown, Facing the end face of the tunnel crown part of the lining concrete, the wife form frame with a shape that matches the lining cross-sectional shape of the tunnel crown part above the oppositely placed both sides of the tunnel lining formwork Along with the outer peripheral surface slidably arranged in the tunnel axial direction, and the vibration compaction of the concrete supply port and the vibration compaction device into the crown space between the end form and the end surface of the existing lining concrete. And the concrete is supplied to the crown space from the concrete supply port, and the concrete is supplied while the supplied concrete is compacted by the vibration compaction device. By providing a tunnel lining concrete 設方 method comprising the step of pouring the lining concrete of the tunnel crown while sliding on the side away from the existing lining concrete, in which to achieve the above objects.

  And the tunnel lining concrete placement method of the present invention provides the lining concrete of the tunnel crown while balancing the amount of increase in the volume of the crown space due to the movement of the end form and the supply amount of concrete. It is preferable to cast.

  In the tunnel lining concrete placing method of the present invention, the tunnel crown lining concrete is cast while maintaining the concrete pressure applied to the end form from the concrete inside the crown space substantially constant. It is preferable to install.

  Furthermore, the tunnel lining concrete placing method of the present invention is configured to slide and move the end form frame to the side away from the existing lining concrete by pressure from the concrete supplied under pressure to the crown space. You can also

  Further, the present invention is a wife formwork apparatus used when placing lining concrete of a tunnel crown in a tunnel lining concrete placing method for forming lining concrete using a tunnel lining formwork. And having a shape that matches the cross-sectional shape of the lining of the tunnel crown, and is connected to the wife mold frame that is disposed along the outer peripheral surface of the tunnel lining mold frame, and the wife mold frame via a connecting rod. A slide base comprising an auxiliary frame portion disposed opposite to the wife mold frame at a predetermined interval, slide moving means provided on the slide base, and the wife mold frame and the auxiliary frame portion. Supported by a concrete supply pipe with a concrete supply port at the tip opening on the side opposite to the auxiliary frame portion of the end form frame, supported by the end form frame and the auxiliary frame portion, and a vibration compaction portion Opposite to the auxiliary frame part of the wife formwork By providing a wife mold apparatus comprising a vibrating compaction apparatus to be projected placed to one in which to achieve the above objects.

  In the wife formwork apparatus according to the present invention, an upper edge seal member that seals a gap with a natural ground is attached to the upper edge part of the wife formwork, and the lower end part of the wife formwork is advanced. It is preferable that a lower end sealing member for sealing a gap between the ceiling end surfaces of the lining concrete on both side portions provided is attached.

  According to the tunnel lining concrete placing method or the end form device of the present invention, a plurality of vibration compaction devices can be provided without providing guide rails for guiding the vibration compaction device such as a vibrator in the tunnel axial direction in advance. The concrete used and supplied to the tunnel crown can be placed while being effectively compacted over a wide range so that the desired quality can be obtained.

  As shown in FIGS. 1A to 1D, a tunnel lining concrete placing method according to a preferred embodiment of the present invention is a tunnel 12 using a concrete lining formwork 10 in a mountain tunnel construction method, for example. When the lining concrete 11 at the side and upper part of the tunnel is cast and formed, the lining concrete 11a of the crown portion (crown portion) 13 of the tunnel 12 is used as both side portions 11b below it, for example, of the tunnel 12 This was employed as a method for placing the lining concrete 11 on the side wall portion and the arch-shaped portion and then placing it while sufficiently compacting.

  Here, in the present embodiment, the concrete lining mold 10 is a slide movement type centle known as a conventional technique, for example, with a predetermined span of about 10 m as the tunnel 12 excavates. It is possible to sequentially cast and form the lining concrete 11 on the side portion and the upper portion of the tunnel 12 while re-installing the tunnel 12 from the rear to the front in the digging direction. Moreover, in this embodiment, concrete is supplied to the both side parts 11b of the lining concrete 11 through the inspection window 14 provided in the installed concrete lining formwork 10, for example by the method similar to the conventional construction method. At the same time, by inserting a vibrator as a vibration compaction device through the inspection window 14 and compacting the supplied concrete, the lining concrete 11 of the both side portions 11b precedes the lining concrete 11a of the tunnel crown portion 13. Will be placed.

  And the tunnel lining concrete placement method of this embodiment is the lining concrete placement method in which the lining concrete 11 is formed by using the tunnel lining form 10, and the lining concrete is provided below the tunnel crown portion 13. 11 on both sides 11b, the tunnel crown 13 is laid above the oppositely placed both sides 11b so as to face the end surface 15a of the tunnel crown 13 of the existing lining concrete 15 already formed. A wife mold 16 having a shape that matches the cross-sectional shape is disposed so as to be slidable in the tunnel axial direction X along the outer peripheral surface 10a of the tunnel lining mold 10, and from the wife mold 16 to the wife mold 16 A concrete supply port 18a and a vibration compaction unit 19a of the vibration compaction device 19 are disposed in the crown space 17 between the end surface 15a of the existing lining concrete 15 and The concrete is supplied to the crown space 17 from the concrete supply port 18a, and the tunnel crown is slid to the side away from the existing lining concrete 15 while the supplied concrete is compacted by the vibration compaction device 19. A step of placing the lining concrete 11a of the portion 13 is included.

  Further, in the present embodiment, the end form 16 is opposed to the end face 15a of the existing lining concrete 15 so as to be slidable on the outer peripheral face 10a of the tunnel lining form 10, and the concrete is supplied to the crown space 17. As a means for disposing the mouth 18a and the vibration compaction portion 19a of the vibration compaction device 19, for example, a wife mold apparatus 20 shown in FIG. 2 is used.

  That is, the wife formwork apparatus 20 of the present embodiment shown in FIG. 2 is a tunnel lining concrete placing method in which the lining concrete 11 is formed using the tunnel lining formwork 10, and the tunnel crown portion 13 is covered. This is a formwork device used when placing concrete 11a, and has a shape that matches the cross-sectional shape of the tunnel crown 13 lining and is arranged along the outer peripheral surface 10a of the tunnel lining formwork 10 The slide base 21 including the mold frame 16 and the auxiliary frame portion 23 which is connected to the wife mold frame 16 via the connecting rod 22 and is arranged to face the wife mold frame 16 at a predetermined interval, and the slide For example, a driving motor 25 and a traveling wheel 26 as slide moving means provided by being supported by, for example, a connecting rod 22 of the base 21, supported by the end form frame 16 and the auxiliary frame portion 23, and supplying concrete at the tip. The mouth 18a is supported by the concrete supply pipe 18 that opens to the side opposite to the auxiliary frame portion 23 of the end form frame 16, and the end form frame 16 and the auxiliary frame portion 23, and the vibration compaction portion 19a is supported by the end form frame 16. The vibration compaction device 19 is provided so as to protrude from the side opposite to the auxiliary frame portion 23.

  The end form 16 constituting the slide base 21 is made of a metal or synthetic resin belt-like plate member having a width corresponding to the thickness of the lining concrete 11a of the tunnel crown 13 and is used as a tunnel lining formwork. It is formed by being curved in an arc shape along the shape of the curved outer peripheral surface 10a of the top surface portion of the ten. In addition, the lower end of each side of the curved shape 16 is notched in the lateral direction so that the lower end portions of both sides of the curved shape correspond to the preset height of the top end surface of the lining concrete 11 of the both side portions 11a to be placed in advance. It is. Further, the end frame 16 is formed with a supply pipe mounting hole 24 for fitting the tip end portion of the concrete supply pipe 18 in the upper central portion, and predetermined portions are provided on both sides of the supply pipe mounting hole 24, respectively. A plurality of locking holes 27 for inserting and locking the vibration compacting portion 19a of the vibration compacting device 19 are formed at intervals. Furthermore, one end of a connecting rod 22 that connects and integrates the wife mold 16 and the auxiliary frame 23 is joined and fixed to the surface of the wife mold 16 on the auxiliary frame 23 side.

  Further, according to the present embodiment, the upper peripheral portion of the end form 16 is sealed with a gap between the inner peripheral surface covered with shotcrete and the natural ground 30 after tunnel excavation (see FIG. 1). An upper peripheral seal member 28 made of, for example, a rubber plate or a rubber tube is attached. Further, at the lower end portion of the end form frame 16, for example, a rubber plate or a rubber tube that seals a gap between the both side portions 11b that have been previously placed and preferably the top end surface of the lining concrete 11 that has not yet been solidified. A lower end seal member 29 made of or the like is attached. By providing these seal members 28 and 29, when the concrete is supplied and driven into the crown space 17, the concrete effectively leaks from the crown space 17 to the auxiliary frame portion 23 side. It can be avoided. Note that a lower peripheral edge sealing member for sealing a gap between the outer peripheral surface 10a of the tunnel lining mold 10 and the lower peripheral edge portion of the end frame 16 may be further provided. In addition, a pressure sensor 31 that measures the concrete pressure applied to the wife mold 16 from the concrete supplied into the crown space 17 may be attached to the surface of the wife mold 16 on the auxiliary frame 23 side. it can.

  The auxiliary frame portion 23 that constitutes the slide base 21 is preferably made of a metal or synthetic resin belt-like plate member that is slightly smaller than the end frame 16 and is curved on the outer peripheral surface 10 a of the tunnel lining mold 10. It is formed in an arc shape so as to follow the shape, and is arranged in a state of being floated from the top surface portion of the tunnel lining formwork 10. Further, the other end portion of the connecting rod 22 that connects and integrates the end frame 16 and the auxiliary frame portion 23 is joined and fixed to the surface of the auxiliary frame portion 23 on the end frame 16 side. Is arranged opposite to the wife formwork 16 with an interval of, for example, about 1 m. Further, the auxiliary frame portion 23 is formed with a supply pipe insertion hole 32 through which the concrete supply pipe 18 is inserted in the upper central portion, and at both sides of the supply pipe insertion hole 32, a predetermined interval is provided. A plurality of cable insertion holes 34 through which the cable portion 19b of the vibration compacting device 19 and the power cable 33 to the drive motor 25 are inserted are formed.

  The connecting rod 22 that connects and integrates the end frame 16 and the auxiliary frame portion 23 is a rod-shaped member made of metal or synthetic resin, and in this embodiment, the concrete supply pipe 18 disposed in the upper central portion is connected. One pair is provided on each of the sandwiched sides with a predetermined interval. Each pair of connecting rods 22 also functions as a mounting base for installing a drive motor 25 and a traveling wheel 26 as slide moving means, and rotatably supports an axle 26a of the traveling wheel 26, and also a drive motor. 25 is held and fixed in a state where it is floated from the outer peripheral surface 10 a of the tunnel lining formwork 10. Further, a reaction force magnet 35 is attached to the connecting rod 22, and a traveling wheel 26 is obtained by applying a magnetic force in a direction in which the connecting rod 22 is attracted to the outer peripheral surface 10 a of the tunnel lining form 10. And the outer peripheral surface 10a of the tunnel lining form 10 can be increased to effectively prevent the traveling wheel 26 from slipping when the slide base 21 is slid. .

  The concrete supply pipe 18 is a metal flexible piping member having an inner diameter of about 100 mm, for example, and is provided in both the supply pipe insertion hole 32 of the auxiliary frame portion 23 and the supply pipe mounting hole 24 of the end form frame 16. By being inserted, it is supported by the end form frame 16 and the auxiliary frame portion 23. Further, the distal end portion is fitted in the supply pipe mounting hole 24 of the end frame 16 and is locked in a state of slightly protruding to the side opposite to the auxiliary frame portion 23, whereby the concrete supply port 18a at the distal end is locked. The state of opening toward the crown space 17 on the side opposite to the auxiliary frame portion 23 can be firmly held. The other end of the concrete supply pipe 18 is connected to a concrete pump 36 provided inside the existing lining concrete 15 behind, for example, through the inside of the tunnel lining form 10 (see FIG. 1). As a result, the concrete is pumped and supplied from the concrete pump 36 to the crown space 17.

  The vibration compacting device 19 includes, for example, a vibration compacting portion 19a made of a rod-like vibrator having an internal vibration body or the like that vibrates by the rotational force of a motor, and the vibration compacting portion 19a connected to the vibration compacting portion 19a. In addition, a known concrete compaction device configured by a cable portion 19b made of a flexible power supply hose in which a connection line or the like is accommodated can be preferably used. The cable portion 19 b is inserted into the cable insertion hole 34 of the auxiliary frame portion 23, and the base end portion of the vibration compaction portion 19 a is inserted and locked into the locking hole 27 of the end frame 16, whereby the vibration compaction device 19. Is supported by the wife mold 16 and the auxiliary frame 23. Further, the vibration compaction portion 19a has a base end portion that is inserted and locked into the locking hole 27 of the end frame 16 so that the vibration compaction portion 19a protrudes into the crown space 17 with a length of about 400 to 500 mm, for example. It can be held firmly.

  And according to this embodiment, if the lining concrete 11 of the both-sides part 11b is cast | placed through the inspection window 14 and compacting concrete like the prior art, the tunnel crown part 13 of the tunnel lining formwork 10 will be provided. On the outer peripheral surface 10a, the end form frame device 20 is set in a state where the end form frame 16 is disposed on the rear side in the tunnel excavation direction X and the auxiliary frame portion 23 is disposed on the front side in the tunnel excavation direction X. As a result, the end frame 15 slides in the tunnel axial direction X along the outer peripheral surface 10a of the tunnel lining mold 10 in a state in which the existing lining concrete 15 faces the end surface 15a of the tunnel crown portion 13 in close proximity. Will be arranged as possible. Further, the concrete supply port 18a at the tip of the concrete supply pipe 18 and the vibration compaction portion 19a of the vibration compaction device 19 are disposed from the end form 16 to the crown space 17 (FIG. 1 (a). )reference).

  From this state, the concrete pump 36 is operated, and the concrete is pumped and supplied to the crown space 17 in the state in which the wife formwork device 20 is set via the concrete supply pipe 18. Is filled with concrete through the concrete supply port 18a (see FIG. 1B). Further, by driving the vibration compaction device 19, the concrete supplied and filled in the crown space 17 is effectively compacted by the vibration compaction portion 19a.

  When the crown space 17 is filled with concrete, the wife mold 16 is slid to the side away from the existing lining concrete 15 by the forward movement of the wife mold apparatus 20 in the tunnel axial direction (digging direction) X. The concrete is further supplied to the crown space 17 whose volume has been increased, and the concrete of the tunnel crown portion 13 is subsequently placed while the supplied concrete is compacted (see FIG. 1C). .

  Then, while sliding the wife formwork device 20, the concrete is cast until the wife formwork 16 reaches the front end of the tunnel lining formwork 10, and the vibration compaction unit 19a of the vibration compaction device 19 is crowned. By pulling out from the space 17 and removing it (see FIG. 1 (d)), the placement work of the lining concrete 11 including the tunnel crown 13 in the span where the tunnel lining form 10 is installed is completed. To do. In addition, before the wife formwork apparatus 20 moves to the front end portion of the tunnel lining formwork 10, the portion of the tunnel lining formwork 10 that protrudes from the front part of the tunnel lining formwork 10 It is preferable to provide a temporary cradle 37 for supporting the wife formwork device 20.

  Here, in the present embodiment, a crown portion whose volume is increased while the wife mold frame 16 is slid to the side away from the existing lining concrete 15 by moving the wife mold apparatus 20 forward in the tunnel axial direction X. In the step of placing the concrete of the tunnel crown 13 while further supplying concrete to the space 17, the amount of increase in the volume of the crown space 17 due to the movement of the end form 16 and the supply amount of concrete are balanced. The movement of the wife formwork 16 can be managed so that the lining concrete 11a of the tunnel crown portion 13 is placed. That is, the amount of movement of the end form 16 is measured by an encoder or the like attached to the traveling wheel 26, and the amount of increase in the volume of the crown space 17 and the amount of concrete supplied are easily controlled by controlling the amount of concrete supplied. Can be balanced.

Further, in the present embodiment, the lining concrete 11a of the tunnel crown portion 13 is placed while maintaining the concrete pressure applied to the end frame 16 from the concrete inside the crown space 17 substantially constant. The movement of the wife formwork 16 can also be managed. That is, the pressure sensor 31 attached to the surface of the end form frame 16 on the auxiliary frame portion 23 side measures the concrete pressure applied to the end form frame 16 from the concrete supplied into the crown space 17, for example, concrete. It becomes possible to control the supply amount of the end form 16 and the concrete so that the end form 16 is moved before the pressure reaches 0.5 N / mm ² .

  Furthermore, in the present embodiment, the end form frame 16 can be slid and moved while being pushed away from the existing lining concrete 15 by the pressure from the concrete supplied under pressure to the crown space 17. This makes it possible to more easily manage the movement of the wife formwork 16.

  And according to the tunnel lining concrete placing method or the end form frame device 20 of the present embodiment, a plurality of vibrations are provided without providing guide rails for guiding a vibration compaction device such as a vibrator in the tunnel axial direction in advance. The concrete supplied to the tunnel crown 13 using the compacting device 19 can be placed while being compacted effectively over a wide range so as to obtain a desired quality. That is, according to the present embodiment, the end form of the end form 16 and the existing lining concrete 15 is provided with the end form 16 provided with the concrete supply port 18a and the vibration compaction portion 19b of the vibration compaction device 19. According to the supply amount of the concrete supplied and filled into the crown space 17 between 15a, it is simple that only slides in the tunnel axis direction X along the outer peripheral surface 10a of the tunnel lining form 10 According to the configuration, the lining concrete 11a of the tunnel crown portion 13 can be placed while being sufficiently compacted without requiring much labor. In addition, a plurality of vibration compacted portions 19b can be easily disposed on the end form frame 16 in accordance with the width and thickness of the tunnel crown portion 13 and can be easily attached. The concrete supplied to the tunnel crown 13 is squeezed while being effectively compacted over a wide range so as to obtain a desired quality by a plurality of vibration compaction portions 19b arranged according to the cross-sectional shape of the lining. It becomes possible to install.

  Furthermore, according to the present embodiment, the concrete is supplied and placed in the crown space 17 from the state in which the end frame 16 is disposed close to the end face 15a of the existing lining concrete 15, so that the existing lining concrete is placed. In the vicinity of 15, it is difficult to form a cavity, and the concrete supplied at almost the same time as being supplied to the crown space 17 can be compacted by the vibration compaction portion 19 b, so that high-quality lining concrete 11 a is obtained. It becomes possible. Furthermore, the concrete supply port 18a moves with the movement of the end form 16, so that the placed concrete itself hardly moves, so that the finished lining concrete 11a having no striped pattern can be obtained. It becomes possible to obtain.

  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 crown lining concrete in other tunnels other than mountain tunnels. Further, it is not always necessary to provide a seal member on the upper peripheral edge or lower end of the wife formwork. Furthermore, the inner peripheral surface of the tunnel, which forms a lining space between the outer periphery of the tunnel lining formwork, is the inner periphery of the tunnel after the primary lining as well as the ground covered with sprayed concrete. It may be a lining surface for performing secondary lining by a surface. Furthermore, the present invention can be applied to the tunnel lining concrete placing method of the present invention using devices and members other than the above-mentioned wife formwork device.

(A)-(d) is a side view which shows the work procedure of the tunnel lining concrete placement method which concerns on preferable one Embodiment of this invention, and shows one part as sectional drawing. 1 is a schematic perspective view of a wife formwork apparatus according to a preferred embodiment of the present invention. (A) is sectional drawing seen from the tunnel axial direction which shows the state which installed the formwork for concrete lining along the inner peripheral surface of a tunnel, (b) is the same side view. (A)-(d) is a side view which shows the work procedure of the conventional tunnel lining concrete placement method, and shows one part as sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concrete lining formwork 10a Peripheral surface 11 of tunnel lining formwork Covering concrete 11a Covering concrete 11b of crown part Covering concrete 12 of both sides Tunnel 13 Tunnel crown part 14 Inspection window 15 Existing lining concrete 15a End surface 16 of existing lining concrete Formwork 17 Crown space 18 Concrete supply pipe 18a Concrete supply port 19 Vibration compaction device 19a Vibration compaction unit 19b of vibration compaction device Cable part 20 of vibration compaction device 21 Slide base 22 Connecting rod 23 Auxiliary frame 25 Drive motor (slide moving means)
26 Traveling wheel (slide moving means)
28 Upper peripheral seal member 29 Lower seal member 30 Ground 35 Reaction force magnet 36 Concrete pump X Tunnel axial direction (tunnel excavation direction)

Claims (6)

In the tunnel lining concrete placement method of forming lining concrete using a tunnel lining formwork,
After placing both sides of the lining concrete to the lower part of the tunnel crown, face the end face of the tunnel crown of the existing lining concrete that has already been formed. A wife mold having a shape that matches the cross-sectional shape of the lining is disposed so as to be slidable in the tunnel axial direction along the outer peripheral surface of the tunnel lining mold, and from the wife mold and the existing lining concrete A concrete supply port and a vibration compaction unit of the vibration compaction device are disposed in the crown space between the end surfaces of
While supplying concrete from the concrete supply port to the crown space, the tunnel is slid to the side away from the existing lining concrete while the supplied concrete is compacted by the vibration compaction device. A tunnel lining concrete placing method including a step of placing crown lining concrete.   2. The tunnel lining concrete placement according to claim 1, wherein the lining concrete of the tunnel crown portion is placed while balancing the amount of increase in the volume of the crown portion space due to the movement of the wife formwork and the supply amount of concrete. Installation method.   2. The tunnel lining concrete placement according to claim 1, wherein the lining concrete of the tunnel crown portion is placed while maintaining a concrete pressure applied to the end form from the concrete supplied to the crown space substantially constant. Installation method.   The tunnel lining concrete placement according to any one of claims 1 to 3, wherein the end frame is slid and moved while being pushed away from the existing lining concrete by pressure from concrete supplied under pressure to the crown space. Installation method. In the tunnel lining concrete placing method for forming lining concrete using a tunnel lining formwork, a wife formwork device used when placing the lining concrete of the tunnel crown,
A shape that matches the cross-sectional shape of the lining of the tunnel crown, and a wife mold frame that is disposed along the outer peripheral surface of the tunnel lining mold frame, and is connected to the wife mold frame via a connecting rod A slide base composed of an auxiliary frame portion arranged to face the wife mold frame at a predetermined interval, a slide moving means provided on the slide base, and supported by the wife mold frame and the auxiliary frame portion. The concrete supply pipe at the tip is supported by the concrete supply pipe that opens to the opposite side of the auxiliary frame portion of the wife mold frame, the wife mold frame and the auxiliary frame portion, and the vibration compaction portion is the wife A wife formwork device comprising a vibration compaction device that protrudes from the side opposite to the auxiliary frame portion of the formwork. An upper peripheral seal member that seals a gap between the upper and lower rims of the wife formwork is attached to the upper peripheral part of the end formwork, and the top of the lining concrete on both side parts that are previously placed on the lower end part of the end formwork. The end form frame device according to claim 5 , wherein a lower end seal member for sealing a gap between the end face and the end face is attached.

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