JP6074950B2 - Tunnel lining formwork - Google Patents

Description

  The present invention relates to a tunnel lining formwork for lining a pit formed by excavation with concrete.

  Conventionally, when lining an excavated mine with concrete, a mobile centre with a mold corresponding to the pit wall is placed in the pit, and concrete is placed between the pit wall and the mold to cover the pit. doing. As such a mobile centile, a telescopic mobile formwork (hereinafter referred to as a telescopic formwork) is known.

In general, the telescopic formwork is a cylinder or arch-shaped formwork, which is demolded after lining concrete is cast and folded, and then passed through the formwork that is being cured. The mold is expanded and assembled into a cylindrical shape or an arch shape (for example, see Patent Document 1).
And in a telescopic formwork, the formwork arrange | positioned before and behind the advancing direction is connected by bolt joining. Further, in the tunnel curving section, a curve liner is interposed between the molds, and the curve liners and the front and rear molds are connected by bolt joining.

JP-A-9-209696

However, the conventional telescopic formwork has the following problems.
That is, when tunnel lining is performed at the tunnel curve part, a curve liner that matches the curvature of the tunnel curve part is required, and there is a problem that fine adjustment when setting the formwork takes time and effort. .

Further, when setting the formwork to be placed (first formwork), it is arranged forward and backward while pressing against the front and back surfaces in the tunnel traveling direction of the previously placed formwork (second formwork). The first mold frame and the second mold frame are joined together by bolts. In this case, the number of bolt fastening points is large, and it takes time to connect and disconnect the molds to be connected, so that the construction efficiency is reduced.
Further, when the load of the first mold joined to the second mold is being cured and the load is transmitted to the concrete in the second mold, cracks are generated at the time of demolding, for example. Since the quality of the lining concrete can be lowered, for example, there is room for improvement in that respect.

The present invention has been made in view of the above-described problems, and can easily set a formwork, and in particular, tunnel lining that can improve the work efficiency of the formwork set at the tunnel curve portion. The purpose is to provide a formwork.
Another object of the present invention is to provide a tunnel lining formwork that can suppress deterioration of the quality of the lining concrete.

In order to achieve the above object, the tunnel lining mold according to the present invention comprises a plurality of arch molds having a front end plate and a rear end plate, and one of the plurality of arch molds is placed in advance. The first arch frame is removed and reduced in diameter, and the tunnel cover is moved forward on the front side of the first arch frame through the inside of the other second arch frame being cured and moved forward to the next placement section. This is a work form, provided at the connecting part between the arch form frames arranged at the front and back, and a smooth surface was formed in which the surface on the sky side in the tunnel was flush with the surface of the lining concrete A face wood member having a face wood body and a projecting rib projecting from the smooth surface of the face wood body toward the inner space of the tunnel and being engageable with the front end plate in the forward movement direction of the second arch form frame is provided. Projecting out of a smooth surface with the wooden member locked to the second arch formwork The first arched frame to the portion of the forward movement direction overlapping across the blanking, between the said first arched frame and the second arched frame is disposed the projecting rib, said the projecting rib a A gap is formed in the axial direction of the tunnel between the one arch frame .

In the present invention, the first arch form frame can be arranged in a state of being overlapped with the smooth surface of the face wood body of the face member locked to the front end plate of the second arch form frame being cured. Thus, it is not necessary to connect the front and rear arch-shaped frames by bolt fastening. That is, the arch-shaped frames can be disposed adjacent to each other without being joined, and the first arch-shaped frame is disposed in a state where the first arch-shaped frame overlaps the smooth surface of the face wood member. It is possible to prevent the concrete placed in step 3 from leaking out between the arch form frames.
In addition, since the front and rear arch frames are not directly joined by bolt fastening or the like as in the prior art, easy fine adjustment when positioning the first arch frame with respect to the second arch frame being cured Can be done.

  In addition, since the second arch frame can be moved and arranged within the range where the second arch frame overlaps the smooth surface of the face plate member, the curvature can be increased even in the tunnel curved portion placement section. In addition, the first arch form can be arranged at an angle. Therefore, a gap is formed between the arch-shaped frames, and it is possible to easily adjust the alignment and extension of the tunnel without using a curve liner as in the past, thereby improving work efficiency. it can.

  Further, since the second arch form frame and the first arch form frame are not joined with bolts or the like, they are not pressed by the first arch form frame in which the second arch form frame being cured is set. Therefore, the load received by the first arch form frame is not transmitted to the second arch form frame being cured, and it is possible to suppress the occurrence of cracks or the like in the lining concrete being cured by the second arch form frame. And the quality of the lining concrete can be ensured.

  In the tunnel lining form according to the present invention, it is preferable that the protruding ribs are partially provided in the circumferential direction of the tunnel.

  In this case, it is possible to reduce the number of connection parts of the face member to the front end plate of the second arch form frame during curing, and to reduce the member cost.

According to the tunnel lining form of the present invention, the front and rear arch forms are not directly joined to each other, so that the subsequent arch form can be easily positioned with respect to the preceding arch form. In particular, it is possible to improve the working efficiency for setting the arch form frame at the curved curve portion.
Further, in the tunnel lining form of the present invention, the front and rear arch form frames are not joined to each other, so that they are not pressed against the arch form frame set by the curing arch form frame, and the quality of the lining concrete is deteriorated. Can be suppressed.

It is a front view which shows the telescopic formwork by embodiment of this invention. It is a side view of the telescopic formwork shown in FIG. It is a figure which shows R part shown in FIG. 2, Comprising: It is a figure which shows the connection part of the arch type | mold frames of a telescopic form frame. 4A and 4B are cross-sectional views of the face wood member shown in FIG. 3, wherein FIG. 4A is a view showing a connecting portion between arch-type frames, and FIG. (A)-(c) is a figure which shows a construction procedure. It is a partial expanded view for demonstrating the connection part of the arch form frame in a tunnel curve part, (a) is a figure which shows the arrangement | positioning state of a tunnel straight part, (b) is a figure which shows the arrangement | positioning state of a tunnel curve part. is there. It is a figure which shows the connection part of the arch form frames by a 1st modification, Comprising: It is a figure corresponding to FIG. It is sectional drawing of the face-piece member shown in FIG. It is a figure which shows the connection part of the arch form frames by a 2nd modification, Comprising: It is a figure corresponding to FIG. It is sectional drawing of the face-piece member by a 3rd modification. It is sectional drawing of the face-piece member by a 4th modification. It is sectional drawing of the face member by the 5th modification.

  Hereinafter, a tunnel lining form according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the tunnel lining form according to the present embodiment forms lining concrete 2 on the pit wall surface 7 in a tunnel mine excavated by an unillustrated excavator. However, the mobile telescopic formwork 1 is targeted.

  Here, in the telescopic formwork 1, the advancing direction in which the lining concrete 2 is placed in the tunnel axial direction X is referred to as “forward direction”, “front side”, “forward”, and the opposite directions are “reverse direction”, “ It is called “rear side” and “rear side”. In FIG. 2, the right side of the drawing is the face side, and the lining concrete 2 is formed from the left side of the drawing from the left side to the right side with the telescopic formwork 1 of the present embodiment.

  The telescopic mold 1 includes a plurality of (here, two sets) arch-shaped frames 3, and one of the two sets of arch-shaped frames 3 is removed by reducing the diameter of one of the arch-shaped frames 3 </ b> A previously placed. The next arching section (front side of the arch-shaped frame 3B) passing through the inside of the other arch-shaped frame 3B set at the placement position adjacent to the front side of the one arch-shaped frame 3A To move forward.

  The telescopic formwork 1 supports the two sets of arch formwork 3 (3A, 3B) assembled in an arch shape along the tunnel circumferential direction of the pit wall surface 7 and the arch formwork 3A, 3B from the inside of the tunnel. And a telescopic jack 5 that is provided on the support cart 4 and supports the arch frame 3 so that the diameter of the arch frame 3 can be reduced.

  The support carriage 4 is framed in a gate shape, and can pass through the wind pipe 11 extending along the tunnel axial direction X necessary for tunnel excavation and the transport conveyor 12 for excavating and discharging soil to the inside of the tunnel. And a wheel 42 capable of traveling on a rail laid on the tunnel roadbed at the lower end of the leg portion 41. The support carriage 4 is provided detachably with respect to the arch frame 3 via the above-described telescopic jack 5. Specifically, the distal end of the expansion / contraction jack 5 is configured to be removable with respect to the arch form frame 3, and only the support carriage 4 can be moved alone. Further, a vehicle such as a truck can also pass through the inner side of the tunnel of the support carriage 4.

  As shown in FIG. 2, two sets of the arch form frames 3A and 3B are arranged along the tunnel axis direction X, and each selectively takes the reduced diameter posture P1 and the enlarged diameter posture P2 shown in FIG. In the case of each of the diameter-reduced postures P1, the inside of the arched frame 3 of the other diameter-expanded posture P2 can be passed. That is, in the arch form frame 3, the diameter expansion posture P2 is a posture at the time of placing and mold setting, and the diameter reduction posture P1 is a posture at the time of demolding and moves together with the support cart 4 toward the tunnel axial direction X. It is possible posture.

  The arch form frame 3 is divided into five in the tunnel circumferential direction, and has a top end form 31, a pair of side forms 32, 32, and a pair of leg forms 33, 33. Foams 31, 32, and 33 adjacent to each other in the tunnel circumferential direction are connected by a hinge joint that rotates around a direction parallel to the tunnel axis direction X. In the reduced-diameter posture P1, the posture is changed so that the pair of side foams 32, 32 are folded with respect to the top end foam 31 and the leg foam 33 is folded toward the inner side of the tunnel with respect to each of the side foams 32. Is done. Moreover, the top end form 31 is provided on the floor surface of the support carriage 4 so as to be movable up and down by an upper telescopic jack 51 that expands and contracts in the vertical direction.

  As shown in FIG. 3, the arched frames 3A and 3B include an outer surface plate 34 that is curved in an arch shape facing the pit wall surface 7 and from both ends of the outer surface plate 34 in the tunnel axial direction X toward the inner side of the tunnel. And a pair of end plates 35 (front end plate 35A, rear end plate 35B) that protrude along the circumferential direction of the tunnel. The length (width dimension L1) of the arch-shaped frames 3A and 3B in the tunnel axis direction X is formed to be shorter than a single placement section length L2.

  Of the pair of end plates 35, the rear end plate 35 </ b> B is provided with a pressing plate 36 that projects rearward from the outer surface side.

  As shown in FIG. 3 and FIG. 4, face wood members 6 are provided at the inner peripheral side corners of the connecting portion T between the arch-shaped frames 3 </ b> A and 3 </ b> B arranged in the front-rear direction. As shown in FIG. 4A, the face wood member 6 is provided so that a pair of face woods 61 and 62 can be combined in the front-rear direction. Here, of the pair of face timbers 61 and 62, the one disposed on the rear side is referred to as a first face timber 61, and the one disposed on the front side is referred to as a second face timber 62. And the 1st surface wood 61 and the 2nd surface wood 62 are mutually combined in the position of the joint surface of the lining concrete 2 and 2 provided adjacent to a tunnel advancing direction. In addition, the 1st surface wood 61 and the 2nd surface wood 62 are divided | segmented into multiple and extended along the tunnel circumferential direction.

  As shown in FIG. 4 (b), the face wood member 6 arranged on the front side of the lining concrete 2 is set only by the first face wood 61 provided at the inner peripheral corner of the front side at the time of placing the concrete. Then, the frame material 8 is attached instead of the second face wood 62. The collar frame material 8 is provided with a bolt hole 8 a that can be fixed to the arch frame 3 with a bolt 63. The saddle frame material 8 is inserted under bolt holes 8a, 61a, 35a coaxially communicating with each other through the L-shaped steel 81 at the upper portion of the outer surface thereof and tightened with nuts 64, thereby The side portion is attached to the arch frame 3 and is supported by being stretched by a backing plate 83 made of a log material or the like and a cutting beam 84 in the upper portion of the outer surface. A wedge material 82 is driven between the L-shaped steel 81 and the collar frame material 8, and the lower portion of the collar frame material 8 is more firmly fixed to the arch frame 3. By providing the eaves frame member 8 in this manner, a support structure that can withstand the pressure of the concrete placed outside the arch frame 3 is obtained.

  As shown in FIG. 4A, the first face wood 61 includes a first face wood main body 61A for forming a tapered face 2a at the inner peripheral corner of the lining concrete 2, and a first face wood main body 61A. And a first protruding rib 61B that protrudes from the inner peripheral surface toward the inner space of the tunnel and that can be locked to the front end plate 35A in the forward movement direction of the other arch-shaped frame 3B. 61 A of 1st face-wood main bodies have comprised the cross-sectional triangle shape which has an opening part in the front side.

  The second face wood 62 includes a second face wood main body 62A in which a smooth surface 62a in which the surface on the air side in the tunnel is flush with the surface 2b of the lining concrete 2 and the air side in the tunnel from the smooth surface 62a. And a protruding piece 62C extending forward from the protruding end of the second protruding rib 62B.

The second face wood main body 62 </ b> A has a solid triangular cross section, and a convex portion 62 </ b> D that can be engaged with the opening of the first face wood 61 is formed at the rear end. The protruding piece 62C is provided with a long hole 62c that is long in the front-rear direction. A nut 65B is screwed into a support bolt 65A inserted through the long hole 62c from the pit wall surface 7 side through a substantially C-shaped washer 65C. At this time, the washer 65C is in contact with the inner peripheral surface 3a of the one (front side) arch frame 3A in a state where the face wooden member 6 is attached to the other (rear side) arch frame 3B. The second face wood main body 62A is supported so as not to fall from the arch form frame 3A. In addition, the position of the support bolt 65A can be adjusted to an appropriate position in the longitudinal direction of the long hole 62c by using the long hole 62c.
The thickness dimension of the washer 65C is appropriately changed according to the gap between the arch frame 3 and the protruding piece 62C.

  The projecting ribs 61B and 62B of the first face wood 61 and the second face wood 62 penetrate in the thickness direction at positions in the tunnel circumferential direction corresponding to the bolt holes 35a of the front end plate 35A of the arch frame 3. Bolt holes 61a and 62b are provided. That is, the face wood member 6 is attached to the other arch frame 3B by inserting the bolts 63 into the respective bolt holes 35a, 61a, 62b and fastening the nuts 64.

  Then, in a state where the face wooden body 61 is locked to the other arch-shaped frame 3B, one arch-shaped frame 3A overlaps with the smooth surface 62a of the second surface timber 62, and the other arch-shaped frame 3B and one A gap D (see FIG. 4A) is formed between the arch-shaped frame 3A.

  The overhang length of the press plate 36 in the tunnel axial direction X overlaps the smooth surface 62a of the second face wood 62 of the face wood member 6 when the front end plate 35A is made to coincide with the front end portion of the placing section. The length dimension to be used. That is, the two sets of arch-shaped frames 3A and 3B are in a non-joined state, so that one arch-shaped frame 3A to be set can provide the gap D with respect to the other arch-shaped frame 3B. It is possible to displace and arrange at an arbitrary position.

  Next, a concrete placing method using the telescopic formwork 1 provided with the above-mentioned face member 6 will be described based on the drawings. Here, the telescopic formwork 1 is intended for the case where the lining concrete is constructed while being advanced toward the face side at a predetermined distance from the face of the tunnel being dug.

  The telescopic formwork 1 shown in FIG. 2 is arranged at a predetermined position in the excavated pit, and two spans of arch formwork 3A, 3B are used to place a span for one span (one set of arch formwork 3A ( 3B) are placed alternately in the front-rear direction. That is, as shown in FIG. 5 (a), the first placement section N1 is placed and cured with one arch-shaped frame (referred to as the first arch-shaped frame 3A), and the front side of the first arch-shaped frame 3A. In the second placement section N2, the other arch frame (referred to as the second arch frame 3B) is set to prepare for concrete placement.

  Next, as shown in FIG. 5 (b), in the second arch form frame 3B that has been prepared for placement, the second placement section N2 is placed and cured, and the rear side of the second arch form frame 3B is placed. In the first placement section N1, the first arch form frame 3A placed and cured prior to the second arch form frame 3B is removed, and the next third placement is performed as shown in FIG. 5 (c). Move to the section N3 (that is, the placement section adjacent to the front side of the second arch form frame 3B during placement and curing), and place the first arch form frame 3A in the third placement section N3. (See FIG. 5 (d)). Thus, the lining concrete 2 is continuously formed in the pit by repeating the process of alternately placing the two sets of arch form frames 3A and 3B.

  Specifically, as shown in FIGS. 5A to 5C, when the first arch frame 3A existing in the first placement section N1 is removed and moved to the third placement section N3. First, in the third placement section N3 (section placed by one set of arch-shaped frames 3), a waterproof sheet (not shown) is installed between the first arch-shaped frame 3A and the pit wall 7 and the reinforcing bars Is provided.

  Then, as shown in FIG. 5 (a), the support carriage 4 is separated from the second arch frame 3B and moved rearward, and the first arch frame 3A placed in the first placement section N1 The support carriage 4 is connected by extending each of the plurality of expansion jacks 5. Then, as shown in FIG. 5 (b), after the curing by the first arch frame 3A is completed, the plurality of expansion jacks 5 are respectively contracted to remove the first arch frame 3A to the reduced diameter posture P1. Typed. After that, as shown in FIG. 5C, the support carriage 4 is moved forward together with the first arch type frame 3A, and the first arch type is provided in the third placing section N3 provided with the waterproof sheet and the reinforcing bar. A frame 3A is arranged.

  At this time, in the first arch form frame 3A, a plurality of expansion jacks 5 are extended to have a diameter-expanded posture P2. As shown in FIG. 4A, the pressing plate 36 provided on the rear end plate 35B of the first arch type frame 3A is the front end of the second arch type frame 3B located in the second placing section N2. The second face wood main body 62A is pressed against the smooth face 62a of the second face wood of the face wood member 6 locked to the board 35A. Further, a gap D is formed between the first arch frame 3A and the second arch frame 3B set in the third placement section N3. Further, projecting ribs 61B and 62B of the first face wood 61 and the second face wood 62 are attached to the front end plate 35A of the first arch form frame 3A by bolts 63 and nuts 64. A saddle type frame 8 shown in FIG. 4B is attached to the front end plate 35A of the second arch type frame 3B via the first surface wood 61 on the front end surface of the third placing section N3.

  More specifically, as shown in FIG. 4A, the second face wood 62 is fixed to the first face wood 61. At this time, the protrusion 62D of the second face wood 62 is engaged with the opening of the first face wood 61, so that the second face wood 62 can be easily aligned with the first face wood 61. Next, the first arch form frame 3A is set, but the second arch form frame 3B side is left in the tunnel axial direction X until the gap D is secured by reducing the diameter of the arch form frame 3 slightly. Then, the diameter is expanded and the pressing plate 36 of the first arch form frame 3A is brought into contact with the second face wood main body 62A of the second face wood 62. At this time, since the first arch form frame 3A is in contact with the rubber-like flexible face wood member 6, it is possible to prevent a load from being applied to the existing lining concrete 2 side. The reduced diameter of the arch frame 3 may be such that the arch frames 3A and 3B enter between the protruding piece 62C and the smooth surface 62a of the second face wood main body 62A.

  Next, as shown in FIG. 5 (d), concrete is placed between the first arch form frame 3 </ b> A and the pit wall surface 7 in the third placement section N <b> 3. And after predetermined | prescribed curing | curing period passes, each 1st arch form frame 3A is diameter-reduced by shrinking each of the some expansion-contraction jack 5 shown in FIG. 1, and demolding is performed.

Next, the effect | action of the telescopic formwork 1 mentioned above is demonstrated in detail based on drawing.
As shown in FIG. 3, the telescopic mold frame 1 of the present embodiment has a smooth surface 62a of the second face wood 62 of the face wood member 6 that is locked to the front end plate 35A of the second arch form frame 3B being cured. On the other hand, since the first arch frame 3A can be arranged in an overlapped state, it is not necessary to connect the front and rear arch frames by bolt fastening as in the prior art. In other words, the arch-shaped frames 3A and 3B can be disposed adjacent to each other without being joined, and the first arch-shaped frame 3A is disposed in a state of being overlapped with the smooth surface 62a of the face wooden member 6. Further, it is possible to prevent the concrete cast by the second arch form frame 3B from leaking out between the arch form frames 3A and 3B.

  Further, since the front and rear arch frames 3A and 3B are not directly joined to each other by bolt fastening or the like as in the prior art, the first arch frame 3A is positioned with respect to the second arch frame 3B being cured. Can be easily adjusted.

  In addition, since the second arch frame 3B can be moved and arranged within the range where the second arch frame 3B overlaps the smooth surface 62a of the face member 6, FIGS. As shown in FIG. 6B, the first arch form frame 3A can be arranged at an angle (reference sign θ shown in FIG. 6B) in accordance with the curvature of the tunnel curving section. Therefore, a gap D is formed between the arch form frames 3A and 3B, and it becomes possible to easily adjust the alignment and extension of the tunnel without using a curve liner as in the prior art. Can be improved.

  Further, as shown in FIGS. 3 and 4 (a), since the second arch frame 3B and the first arch frame 3A are not joined with bolts or the like, the second arch frame 3B being cured is set. The first arch form frame 3A is not pressed in the tunnel axis direction X. Therefore, the load received by the first arch form frame 3A is not transmitted to the second arch form frame 3B being cured, and the second arch form frame 3B is prevented from being cracked in the lining concrete being cured. The quality of the lining concrete can be ensured.

As described above, the tunnel lining form according to the present embodiment has a configuration in which the front and rear arch form frames 3A and 3B are not directly joined to each other. It is possible to easily position the first arch frame 3A, and in particular, it is possible to improve the working efficiency for setting the arch frame 3 at the tunnel curve portion.
In addition, since the front and rear arch frames 3A and 3B are not joined to each other, they are not pressed against the first arch frame 3A set by the second arch frame 3B being cured, and the deterioration of the quality of the lining concrete is suppressed. can do.

  As mentioned above, although the embodiment of the tunnel lining formwork according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.

  For example, in the present embodiment, the shape of the face wood member 6 is not limited to the present embodiment, and can be changed to an appropriate shape. For example, in the above embodiment, the pair of first face wood 61 and second face wood 62 are combined, but as shown in FIGS. 7 and 8, the face wood member is not divided into two parts. 6A may be sufficient. The face wood member 6A according to the first modification straddles the first arch type frame 3A and the second arch type frame 3B, and the surface on the inner side of the tunnel is flush with the surface 2b of the lining concrete 2. A face wooden body 66 having a triangular cross section formed with 66a, a protruding rib 66B protruding from the smooth surface 66a toward the inner space of the tunnel, and a protruding piece 66C extending forward from the protruding end of the protruding rib 66B. I have. The protruding piece 66C is provided with a long hole 66c that is long in the front-rear direction in which the support pin 35 described above is inserted. In addition, in this 1st modification, since it is not the structure to which the eaves frame material 8 is attached to the face wood member 6 (1st face wood 61) shown in FIG. 3 like the said embodiment, as shown in FIG. A fence frame material 8 is provided on the side of the pit wall surface 7 of the face wood member 6A using another fixing jig (not shown).

  9 is a combination of the shape of the face main body 67A of the first face wood 67 and the cross-sectional shape of the face main body 68A of the second face wood 68. It is a substantially trapezoidal shape in the state. The first projecting rib 67B of the first surface wood 67, the second projecting rib 68B and the projecting piece 68C of the second surface wood 68 have the same configuration as in the above embodiment.

  Furthermore, as a face member, it replaces with the face member 6A (refer FIG. 8) of the said 1st modification, and has the trapezoidal face-piece main body 66A by sectional view like the 3rd modification shown in FIG. A face wood member 6D having a plate-like face wood main body 66A as in the case of the face wood member 6C or the fourth modification shown in FIG. 11 may be used.

  Furthermore, as in the fifth modification shown in FIG. 12, instead of the fourth modification, a first face wood 67 having a plate-like first face wood main body 67A and a plate-like second face wood main body. The face wood member 6E provided with the 2nd face wood 68 which has 68A may be sufficient. In this case, the first protrusion rib 67B is formed with a first engagement protrusion 67a, the second protrusion rib 68B is formed with a second engagement protrusion 68b, and the engagement protrusions 67a and 68b are mutually connected. By engaging, the face woods 67 and 68 can be positioned so as not to deviate from each other.

  Further, the protruding ribs of the face wood member may be provided partially at intervals in the circumferential direction of the tunnel, for example, only at positions corresponding to the bolt holes 35a of the front end plate 35A of the arch frame 3. In this case, it is possible to reduce the number of engaging portions of the face member with respect to the front end plate 35A of the arch form frame 3, and it is possible to reduce the member cost.

  In the present embodiment, the pressing plate 36 that protrudes from the rear end plate 35B of the arch form frame 3 is provided. However, the protruding length of the pressing plate 36 can be set arbitrarily, and the pressing plate 36 can be set arbitrarily. Can be omitted. In short, it is only necessary that the gap D is formed between the arch-shaped frames 3A and 3B, and the arch-shaped frame 3 set on the smooth surface of the face wood member is configured to overlap.

  Furthermore, in the present embodiment, the projecting rib of the face wood member and the front end plate 35A of the arch frame 3 are bolted together, but the present invention is not limited to bolt fastening. Locking means can be used.

  Furthermore, the size of the gap D in the tunnel axis direction X between the arch form frames 3A and 3B can be arbitrarily set. In other words, the area of the smooth surface of the wood member and the size of the gap D may be set in accordance with the curvature of the tunnel curve portion to be constructed.

In the present embodiment, the direction in which the lining concrete 2 is formed, that is, the moving method of the telescopic formwork 1 is the same direction as the tunneling direction. However, the present invention is not limited to this. The method of moving 1 may be used. The telescopic formwork 1 of the present embodiment is an example applied to a tunnel excavated by the so-called NATM method, but is not limited to this, and can be adopted for a tunnel having a circular cross section. . In this case, the telescopic formwork is configured to include a foam all around the circumferential direction.
Furthermore, in the present embodiment, two sets of arch-shaped frames 3A and 3B are provided, but a telescopic frame having three or more sets of arch-shaped frames may be used.

Furthermore, the number of divisions and division positions of the arch form frame 3 in the tunnel circumferential direction are not limited to the present embodiment, and can be set as appropriate.
Further, the arrangement of the wind pipes, the conveyors, and the like provided in the telescopic mold 1 is not limited to the present embodiment, and can be changed as appropriate.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 Telescopic formwork (form for tunnel lining)
2 lining concrete 3 arch form frame 3A first arch form frame 3B second arch form frame 4 support carriage 5 telescopic jack 6, 6A to 6E face wood 7 pit wall 35A front end plate 35B rear end plate 36 holding plate 61A, 62A, 66A, 67A, 68A Face wood body 62a, 66a, 68a Smooth surface 61B, 62B, 66B, 67B, 68B Protruding rib D Gap P1 Reduced diameter posture P2 Expanded posture T Joint portion X Tunnel axial direction

Claims (2)

A plurality of arch-shaped frames each having a front end plate and a rear end plate, wherein one of the plurality of arch-shaped frames placed in advance is demolded and reduced in diameter, the first arch A tunnel lining formwork that passes the inside of the other second arch formwork under curing on the front side of the formwork and moves forward to the next placement section,
A face wood main body provided with a smooth surface in which the surface on the air side in the tunnel is flush with the surface of the lining concrete, provided at the connecting portion between the arch form frames arranged in the front and back,
A protruding rib that protrudes from the smooth surface of the face wooden body toward the inner side of the tunnel and can be locked to the front end plate in the forward movement direction of the second arch frame;
A face wood member having
In a state where the face wood member is locked to the second arch-shaped frame, the first arch-shaped frame overlaps the forward movement direction side portion of the smooth surface across the protruding rib,
The protruding rib is disposed between the first arch form frame and the second arch form frame,
A tunnel lining formwork , wherein a gap is formed in the axial direction of the tunnel between the protruding rib and the first arch formwork.   2. The tunnel lining form according to claim 1, wherein the protruding rib is partially provided in a circumferential direction of the tunnel.

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