JP2003184496A - Mold frame used for secondary lining of tunnel and secondary lining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold frame used for the secondary lining of a tunnel capable of preventing crazing from occurring in secondary lined concrete and peeling of the concrete from occurring by soundly assuring the strength thereof by sufficiently curing the secondary lined concrete of a crown part, and a secondary lining method. <P>SOLUTION: This mold frame 1 used for the secondary lining of the tunnel is formed so as to be able to individually move side mold frames 2 and a top end mold frame 3. The side mold frames 2 on both sides are movably supported on guides 6 and 6' for movement installed on the side walls of the tunnel, and allowed to abut on the side jacks 8 for a support 7 disposed at a central part. The top end mold frame 3 is supported on the upper part of the support 7, and formed in connection with an upper jack 11 allowed to move in the direction of the tunnel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork and a secondary lining method used for a secondary lining of a tunnel, and more particularly to a secondary lining of a tunnel for preventing cracks and concrete peeling which occur at the crown of the tunnel. Formwork used for construction and secondary lining method.

[0002]

2. Description of the Related Art On the excavated wall surface of a tunnel, concrete is sprayed on the ground, and after that, concrete is struck by using a formwork to carry out secondary lining.

However, in the conventional construction of secondary lining concrete for tunnels, cracks often occur at the crown portion of the tunnel, which causes concrete peeling and the like.

However, in the construction of the secondary lining concrete, concrete is poured from the side of the lining and the crown portion is the last. Therefore, the cracks that occur in the crown portion of the tunnel are estimated to be based on the following causes.

As a result of the demolding of the secondary lining concrete, the curing period of the crown part is shorter than that of the side wall part, and the strength development is delayed as compared with the side wall part.

Depending on the sectional shape of the tunnel, tensile stress is generated in the secondary lining concrete in the crown portion due to its own weight.

Therefore, under the above circumstances, if the curing time cannot be sufficiently maintained, cracks may occur, which is regarded as a problem.

[0008]

SUMMARY OF THE INVENTION The present invention proposes an improvement measure in view of the above-mentioned situation, in which the secondary lining concrete of the crown portion is cured while securing the cycle time of the construction. We provide a formwork and a secondary lining method used for the secondary lining of tunnels that prevent concrete from peeling off by ensuring the strength sufficiently.

[0009]

The formwork used for the secondary lining of a tunnel according to the present invention basically comprises a side formwork on both sides and a top end formwork located above the side formwork. In the formwork used for the secondary lining of the tunnel, the side formwork and the top end formwork are configured to be individually movable.
The side molds on both sides are movably supported by the guides for movement provided on the side wall of the tunnel, and abut on the side jacks of the supporting work arranged in the center part, and the top end formwork is the upper part of the supporting work. It is characterized in that it is constructed by being connected to the upper jack of the supporting structure that is supported by the bridge and is movable in the direction of the tunnel. The crown of the secondary lining of the tunnel is fully cured and cracks occur in the crown. To prevent concrete from falling off.

The secondary lining method of the tunnel according to the present invention basically uses a side mold on both sides and a top end mold placed above the both side molds to form a secondary side part and an upper part. In the secondary lining method for the tunnel to be lined, the step of lining the tunnel after arranging the formwork used for the secondary lining of the tunnel described above, the side molds on both sides after curing the lined side concrete The process of demolding the frame and advancing to the front position of the top mold along the movement guides provided on the side walls of the tunnel to clean the form, and after curing the lined crown concrete, demolding Of supporting the supporting structure to the end of the lining concrete and cleaning the formwork, and arranging the top formwork and side guides on both sides on the side wall of the tunnel. Is it a process of retracting to the position of the top mold along the It is characterized in that it is installed so that the layout of the formwork is overlapped with the end of the existing concrete, and the cleaning of the formwork on the side wall is accelerated so that the secondary space in the tunnel can be used. The crown of the lining is fully cured to prevent cracking in the crown and to prevent concrete from falling off.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The formwork used for the secondary lining of a tunnel according to the present invention is constructed so that the side formwork and the top end formwork can be moved individually. The side formwork is movably supported by a moving guide provided on the side wall of the tunnel and abuts against the side jack of the support work located in the center, and the top end formwork is supported on the upper part of the support work. It is characterized in that it is connected to the upper jack of the supporting work that is movable at the same time as the tunnel. Embodiments of each invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a formwork used for secondary lining of a tunnel according to the present invention, and is a transverse sectional view (a) and a front view (b) of the tunnel.

The formwork 1 used for the secondary lining of the tunnel comprises a side formwork 2 and a top end formwork 3 and is installed in a state of being superposed on the edge of the existing concrete 4.

The formwork 1 is formed separately so that it can be moved individually, and the side formwork 2 is shown in FIG. 1 (b).
It is supported by moving guides 6 and 6'disposed on the side wall of the tunnel 5 as shown in FIG. Further, the side mold 2 rolls on the moving guides 6 and 6 ', so that the top mold 3
It is configured to be movable in the axial direction of the tunnel 5 separately from.

The side mold 2 is arranged so that it can be fixed to the excavation side wall by an upper end turnbuckle 8 for inversion provided on a supporting structure 7 which will be described later. The part side is maintained in a positional relationship by an invert side turnbuckle 9 provided in the support structure 7.

Further, the top end form 3 has an upper end portion 10 of the support work 7.
The upper jack 11 pushes upward to form the crown portion 12 of the secondary lining concrete 4 '.

The supporting structure 7 supporting the top end form 3 can be moved by the rollers 16 of the legs 15 on the rail 14 provided on the bottom surface 13 of the tunnel. While speeding up the cleaning of the side wall formwork,
The crown part 12 by passing several hours between them
Is sufficiently cured, and after that, the top end mold 3 is demolded and can be moved to the next step.

As described above, the tunnel 2 according to the present invention is
The formwork used for the next lining is basically 2 in the tunnel by making it possible to move the side formwork and the top formwork separately.
It is possible to sufficiently cure the crown portion of the next lining, prevent cracking and formation of a thin concrete layer in the crown portion, and prevent concrete from falling off.

Next, the secondary lining method of the tunnel according to the present invention will be described. The secondary lining method of the tunnel according to the present invention includes the steps of arranging the formwork used for the secondary lining of the tunnel after the secondary lining of the tunnel, and the side molds on both sides after curing the lining side concrete. The process of demolding the frame and advancing to the front position of the top mold along the movement guides provided on the side walls of the tunnel to clean the form, and after curing the lined crown concrete, demolding Of supporting the supporting structure to the end of the lining concrete and cleaning the formwork, and arranging the top formwork and side guides on both sides on the side wall of the tunnel. It is composed of a step of retreating to the position of the top end form along with.

When the formwork 1 is placed in a state of being overlapped with the edge of the existing concrete 4, the post-cast concrete 4'for the secondary lining is placed as shown in FIG. 1 (a). ,
This driving is performed from the side of the lining as in the conventional case, and finally, the crown portion 12 is formed.

2 and 3 show that the side formwork on both sides is demolded after the lining side concrete is cured, and the front position of the top end formwork is taken along a moving guide provided on the side wall of the tunnel. It is an aspect of an embodiment showing a step of advancing to.

FIG. 2 shows a state in which the side formwork on both sides is demolded after curing the lined side concrete.

In this step, the post-casting concrete 4'is placed on the formwork 1 arranged as shown in FIG. 2 (a), and finally the crown portion 12 is formed to form this stage. The secondary lining at Next, when the side concrete of the post-cast concrete 4'has a predetermined curing, the side formwork on both sides is demolded by the contraction of the side jacks, as shown in FIG. 2 (b).

As described above, the side mold 2 and the top mold 3 on both sides are individually operated and separated without interfering with each other, so that the side mold 2 is shown in FIG. ), The mold is removed by removing each turnbuckle.

FIG. 3 shows a state in which the side molds on both sides of the removed mold are advanced to the front position of the top mold along the guides for movement provided in the support of the tunnel.

In this state, as shown in FIGS. 3 (a) and 3 (b), the top end form 3 is placed at the upper end portion 10 of the support structure 7 and remains at that position, Side formwork 2
The tunnel 5 along the moving guides 6 and 6'provided on the sidewalls of the tunnel 5 without interfering with the top mold 3
Since it is configured to be movable in the excavation direction, it is possible to easily move it in front of the tunnel 5,
As is clear from FIG. 3A, the robot is advanced to the tip position of the top mold 3 and enters the standby state.

In this standby state, the side molds 2 on both sides are released, so that in the conventional example, the concrete pouring surface can be cleaned before it can be carried out unless it is integrated with the top mold 3. By using this cleaning time for concrete curing of the crown part 12,
It is possible to secure a lean curing period.

That is, several hours while the side molds 2 on both sides are being operated and cleaned are sufficient for curing the concrete of the crown portion 12 which has been cast with a delay, whereby the crown is made to work. The part 12 can sufficiently exert a predetermined strength.

As a result, it is not necessary to wait for the demolding until the strength of the crown portion is expressed, the construction time is shortened, and the strength of the crown portion is sufficiently expressed, so that the quality can be secured.

The next step is to cure the lined top-end concrete and then remove it from the mold, and the supporter supporting the top-end form moves to the end position of the lined concrete.

FIG. 4 shows a state in which the lined top end concrete, which is the first stage of this process, is cured and then demolded.

The top end form 3 is pushed upward by the upper jack 11 provided on the upper end 10 of the supporting structure 7, but the crown part 12 exerts a predetermined strength by curing due to a delay of several hours. 4A, when the crown portion 12 is collapsed due to its own weight or a state in which the crown portion 12 does not crack even with a pressing force of a predetermined value or more is reached,
As shown in (b), the upper jack 11 is contracted, and the crown end 12 is demolded while the top end mold 3 is lowered.

After the top end mold 3 is demolded, the top end mold 3
The supporting work 7 supporting the roller 16 on the rail 14
By rolling the above, it is moved in the direction of the side formwork 2 waiting on the front side. At this stage, the side formwork 2 is once pushed further forward, then the top end formwork 3 is moved, and then the side formwork 2 is moved.
By retreating, the top mold 3 and the side mold 2 are brought into an intersecting state.

However, the side formwork 2 can also be brought into an intersecting state without necessarily moving.
Also in this case, since the side formwork 2 and the top end formwork 3 are configured so as not to interfere with each other as described above, no trouble occurs even in the crossing state. Absent.

The top end mold 3 is arranged to stop at a position in the vicinity of a range where the top end of the lining crown part 12 overlaps each other, and the next step is dealt with.

5 and 6 show a process of installing a formwork for carrying out the next stage of lining, in which the top end formwork is arranged at the engaging portion with the existing concrete and both sides are arranged. The stage and the state after setting of which the formwork is arranged by retracting to the position of the top end formwork along the moving guide provided on the side wall of the tunnel are shown.

In order to construct the secondary lining at the next stage in the tunnel, the formwork 1 is placed in a state of being overlapped with the edge of the post-cast concrete 4 ', but in the present embodiment, first, The top end form 3 is arranged in the engaging portion 17 with the post-cast concrete 4 ′.

When the top end mold 3 has been placed, in this embodiment, as shown in FIG.
6 ′ is to be retracted from its standby position, and the side molds 2 on both sides are configured to move along the guides 6 and 6 ′ for movement without interfering with the top mold 3 and thus the top mold 3 The support work 7 has been moved to the set position.

When the side formwork 2 on both sides is moved to a predetermined position, it is fixed to the excavation side wall by an inverting upper end turnbuckle 8 provided on the supporting structure 7 as is apparent from FIG. 5B. At the same time, the lower end of the side mold 2 is fixed by an invert side turnbuckle 9 provided on the support structure 7.

FIG. 6 shows the setting conditions of the side molds 2 and the top molds 3 on both sides, and shows the layout of the molds to cope with the placement of the lining concrete in the next stage. The top mold 3 and the side molds 2 on both sides are arranged integrally while reproducing and forming the mold 1 for lining concrete.

Since the secondary lining method of the tunnel according to the present invention is constituted by the respective steps as described above, the side molds on both sides forming the mold and the top mold are individually operated. Therefore, the cleaning of the formwork of the side wall is accelerated, and the crown portion of the secondary lining in the tunnel is sufficiently cured while using the space therebetween, thereby preventing the occurrence of cracks in the crown portion.

Although the present invention has been described in detail above based on the embodiments, the formwork and the secondary lining method used for the secondary lining of the tunnel according to the present invention are not limited to the above-mentioned embodiments. It goes without saying that various modifications can be made to the concrete shape of each mold part, the moving state of the mold, and the like without departing from the spirit of the present invention.

[0043]

The formwork used for the secondary lining of the tunnel according to the first aspect of the invention is a tunnel composed of the side formwork on both sides and the top end formwork located between the side formworks. In the formwork used for the secondary lining, the side formwork and the top end formwork are configured so that they can be moved individually, so that the crown part of the secondary lining concrete is sufficiently cured to allow It is effective in preventing the occurrence of cracks.

2 of the tunnel according to the invention of claim 2
The formwork used for the next lining is the tunnel 2 according to claim 1.
In the formwork used for the next lining, the side formwork on both sides is movably supported by the moving guides provided on the side walls of the tunnel, and abuts against the side jacks of the support work arranged in the center, In addition to the above effects, the side end frame and the top end form are characterized in that the top end formwork is supported by the upper part of the support work and is combined with the upper jack of the support work that can move in the tunnel direction. It has the effect of facilitating individual movement with the frame.

The secondary lining method of the tunnel according to the present invention comprises the steps of laying the formwork used for the secondary lining of the tunnel after the secondary lining of the tunnel, and curing both sides of the lining concrete on both sides. After removing the side formwork of the mold and advancing to the front position of the top end formwork along the movement guide provided on the side wall of the tunnel to clean the formwork, after curing the lined top end form concrete The process of moving the supporting structure that has been removed from the mold to the position of the end of the lining concrete and cleaning the form, and arranging the top form to overlap the end of the existing concrete and arranging both sides. Since it consists of the process of retracting the formwork to the position of the top end formwork along the moving guides provided on the side walls of the tunnel, the side formwork and the top end on both sides forming the formwork Side wall by operating formwork and separately And cleaning the mold slightly early and then to sufficiently cure the crown portion of the secondary lining in the tunnel while utilizing therebetween, it is effective to prevent occurrence of cracks in the crown portion.

[Brief description of drawings]

FIG. 1 is an embodiment diagram of a formwork used for secondary lining of a tunnel according to the present invention.

FIG. 2 is an embodiment diagram showing a demolded state of a side mold forming a mold according to the present invention.

FIG. 3 is an embodiment diagram showing a moving state of a side mold forming a mold according to the present invention.

FIG. 4 is an embodiment diagram showing a demolded state of a top end formwork forming a formwork according to the present invention.

FIG. 5 is a diagram showing an embodiment in which a top mold and a side mold of a mold according to the present invention are arranged and integrated.

FIG. 6 is an embodiment diagram in which the formwork according to the present invention is arranged at the tip of the cast concrete.

[Explanation of symbols]

1 formwork, 2 side formwork, 3 top-end formwork, 4 existing concrete, 4'secondary lining concrete, 5 tunnel, 6, 6'movement guide, 7 support work, 8
Upper end turnbuckle for invert, 9 Side turnbuckle for invert, 10 Upper end, 11 Upper jack, 12 Crown part, 13 Tunnel bottom, 1
4 rails, 15 legs, 16 rollers, 17
Engagement part,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Hasegawa             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation F term (reference) 2D055 BA05 BB02 CA03 DA08 LA05                       LA06

Claims (4)

[Claims] 1. A formwork used for secondary lining of a tunnel, which comprises side formworks on both sides and a top end formwork located between both side formworks, wherein the side formwork and the top end formwork are separately provided. Formwork used for secondary lining of tunnels, characterized in that it can be moved to the 2. A top end mold, in which side molds on both sides are movably supported by a moving guide provided on a side wall of the tunnel and abut on side jacks of a supporting member arranged at a central portion. The formwork used for the secondary lining of a tunnel according to claim 1, wherein the frame is supported on an upper part of the support structure and is connected to an upper jack of the support structure movable in the tunnel direction. 3. A secondary lining method for a tunnel, wherein secondary side lining is performed on a side part and an upper end part by using side molds on both sides and a top end formwork disposed on an upper part between the both side molds. A step of lining the tunnel after arranging the formwork used for the secondary lining of the tunnel according to claim 1 or 2, after curing the lining side concrete, demolding the side formwork on both sides. The process of cleaning the form by advancing to the front position of the top end form along the guide for movement provided on the side wall of the tunnel, curing the lined top end concrete and then removing it from the mold and supporting it. The process of moving the supporting structure to the end position of the lining concrete and cleaning the formwork, and arranging the top formwork, and the side formwork on both sides is the top end along the moving guides provided on the side walls of the tunnel. Secondary lining method for tunnels, which consists of the steps of retreating to the position of the formwork. . 4. The tunnel secondary lining method according to claim 3, wherein the formwork is arranged so as to be superposed on the end of the existing concrete.