JP6901173B2 - How to reconstruct the lining part of the existing two-lane road tunnel - Google Patents

Description

The present invention relates to a method of remodeling a lining part of a tunnel, and more particularly to a method of remodeling a lining part of an existing two-lane road tunnel.

Conventionally, in mountain tunnels, the inner wall surface of the tunnel is constructed with lining concrete, but this lining concrete is cracked, peeled, floated, etc. due to aging and increased load on the ground. Damage will occur and will require repair.

Known repair methods include, for example, demolishing the inner wall surface to reconstruct it, driving rock bolts to reinforce it, applying inwardly wound concrete or inwardly wound support, and adding invert concrete. There is.

However, the conventional repair method has problems such as high construction cost, long construction period, and reduction of the tunnel cross section after repair.
In particular, the conventional repair method has a restriction that the inside of the tunnel must be completely closed during the repair, or the construction must be carried out under one-sided regulation with a risk.

By the way, in order to solve such a problem of the conventional repair method, a shelter that can move along the length direction is provided in the existing tunnel to block the wall work space and the vehicle passage space. While forming and scraping the inner wall surface of the existing tunnel to a predetermined thickness in the wall work space, a high-strength mortar of a predetermined thickness is applied to the scraping surface, and the shelter is applied in the length direction of the tunnel. A tunnel repair method has been proposed in which the tunnel is moved to and continuously constructed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 11-173088

The tunnel repair method described in Patent Document 1 solves the problems of the conventional repair method, and can secure the passage of vehicles in the tunnel even during the repair, that is, the lining portion of the tunnel under the live line. It had the advantage of being able to be remodeled.

However, in this tunnel repair method, since the inner wall surface of the existing tunnel is lifted to a predetermined thickness, defects such as cracks are newly generated in the remaining part of the inner wall of the existing tunnel due to the impact at the time of scraping. There was a problem in terms of durability because the new inner wall surface was constructed by applying high-strength mortar.

In view of the problems of the tunnel repair method described in Patent Document 1, the present invention has a low construction cost, a short construction period, does not reduce the tunnel cross section after repair, and further, the inside of the tunnel is in the tunnel even during repair. It is an object of the present invention to provide a method for reconstructing a tunnel lining part capable of constructing a new inner wall surface having excellent durability while exhibiting the advantage of ensuring the passage of vehicles.

In order to achieve the above object, the method of reconstructing the lining part of the existing two-lane road tunnel of the first invention is a protector that secures a one-lane passage that allows the passage of vehicles in the existing two-lane road tunnel. Is provided so as to be movable along the length direction of the tunnel, and while the protector is intermittently moved in the length direction of the tunnel, it is already installed in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. This is a method of reconstructing the lining part of an existing two-lane road tunnel so that the cutting work of removing the inner wall surface made of the lining concrete to a predetermined thickness and the inner wall surface construction work of constructing a new inner wall surface are performed. hand,
The cutting work is a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, and is relative to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. Two or more drums arranged on a support member formed in an arch shape along the circumferential direction of the inner wall surface of the tunnel arranged so as to be movable and a movable support stand movable in the circumferential direction along the support member. A drum cutter provided with a cutter and arranged on one end side of the drum cutter sets the position of the rotary support shaft of the drum cutter with respect to the moving support in the circumferential direction of the moving support. The drum cutter, which is provided unevenly on one end side and arranged on the other end side, positions the rotation support shaft of the drum cutter with respect to the moving support base on the other side in the circumferential direction of the moving support base. By using a cutting machine that is provided unevenly on the end side of the machine, it consists of a cutting process that cuts in a range wider than the installation angle of the support member formed in an arch shape.
The inner wall surface construction work is lining concrete using a lining formwork arranged so as to be relatively movable with respect to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. It is characterized by consisting of a casting process.

Further, in order to achieve the same purpose, the method of reconstructing the lining part of the existing two-lane road tunnel of the second invention secures a one-lane passage in the existing two-lane road tunnel that allows vehicles to pass. In the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector while the protector is provided so as to be movable along the length direction of the tunnel and the protector is intermittently moved in the length direction of the tunnel. A method of reconstructing the lining part of an existing two-lane road tunnel so that the cutting work of removing the inner wall surface made of the existing lining concrete to a predetermined thickness and the inner wall surface construction work of constructing a new inner wall surface are performed. And
The cutting work is a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, and is relative to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. Two or more drums arranged on a support member formed in an arch shape along the circumferential direction of the inner wall surface of the tunnel arranged so as to be movable and a movable support stand movable in the circumferential direction along the support member. A drum cutter provided with a cutter and arranged on one end side of the drum cutter sets the position of the rotary support shaft of the drum cutter with respect to the moving support in the circumferential direction of the moving support. The drum cutter, which is provided unevenly on one end side and arranged on the other end side, positions the rotation support shaft of the drum cutter with respect to the moving support base on the other side in the circumferential direction of the moving support base. By using a cutting machine that is provided unevenly on the end side of the machine, it consists of a cutting process that cuts in a range wider than the installation angle of the support member formed in an arch shape.
The inner wall surface construction work comprises a precast concrete panel installation process using a precast concrete panel installation device arranged behind the protector.

Further, a carry-out device for carrying out cutting chips generated by a cutting operation for removing the inner wall surface made of the existing lining concrete to a predetermined thickness is formed between the inner wall surface of the tunnel and the outer wall surface of the protector. It can be arranged so that it can run in the work space.

According to the method of reconstructing the lining part of the existing two-lane road tunnel of the first and second inventions, the construction cost is low, the construction period is short, the tunnel cross section after repair does not shrink, and even during repair. Remaining part of the inner wall of the existing tunnel by performing the cutting work using a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, while demonstrating the advantage of ensuring the passage of vehicles in the tunnel. A new inner wall surface with excellent durability is constructed from cast lining concrete and precast concrete panels constructed using a lining formwork while preventing new defects such as cracks from occurring in the tunnel. be able to.

Further, the cutting work is a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, and the cutting work is performed on the protector in a work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. Two or more units arranged on a support member formed in an arch shape along the circumferential direction of the inner wall surface of the tunnel arranged so as to be relatively movable and a movable support base that can move in the circumferential direction along the support member. The drum cutter provided with the above drum cutter and arranged on one end side of the drum cutter sets the position of the rotary support shaft of the drum cutter with respect to the moving support base in the circumferential direction of the moving support base. A drum cutter provided unevenly on one end side and arranged on the other end side determines the position of the rotary support shaft of the drum cutter with respect to the moving support in the circumferential direction of the moving support. By using a cutting machine that is provided unevenly on the other end side of the above, it is formed in an arch shape by consisting of a cutting process that cuts in a range wider than the installation angle of the support member formed in the arch shape. Cutting can be performed in a range wider than the installation angle of the support member, and the cutting work of removing the inner wall surface made of the existing lining concrete to a predetermined thickness includes, for example, the front part of the tunnel. It can be carried out in a single process up to the position of the bottom surface of the tunnel.

Further, a carry-out device for carrying out cutting chips generated by a cutting operation for removing the inner wall surface made of the existing lining concrete to a predetermined thickness is formed between the inner wall surface of the tunnel and the outer wall surface of the protector. By arranging the work space so that it can travel, the safety can be improved by completely separating the place where the cutting chips are carried out and the passage through which the vehicle passes.

It is sectional drawing of the tunnel which shows 1st Example of the method of reconstructing the lining part of the existing two-lane road tunnel of this invention, (a) is a plan sectional view, and (b) is a vertical sectional view. It is a cross-sectional view of each part (A to E) of FIG. It is sectional drawing of the tunnel which shows 2nd Example of the method of reconstructing the lining part of the existing two-lane road tunnel of this invention, (a) is a plan sectional view, and (b) is a vertical sectional view. It is a cross-sectional view of each part (A to D) of FIG.

Hereinafter, embodiments of the method for reconstructing the lining portion of the existing two-lane road tunnel of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the method for reconstructing the lining portion of the existing two-lane road tunnel of the present invention.
The method of reconstructing the lining part of the existing two-lane road tunnel is to install a protector 2 in the existing two-lane road tunnel 1 that secures a one-lane passage that allows vehicles to pass along the length direction of the tunnel 1. The existing lining in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2 while the protector 2 is intermittently moved in the length direction of the tunnel 1. It is a method of reconstructing the lining part of an existing two-lane road tunnel so that the cutting work of removing the inner wall surface 10A made of concrete to a predetermined thickness and the inner wall surface construction work of constructing a new inner wall surface 10B are performed. The cutting work consists of a cutting process using a cutting machine 4 equipped with a drum cutter 41 having a large number of bits on the peripheral surface, and the inner wall surface construction work includes the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. The repair and waterproof sheet construction process performed in the work space 3 formed between the two, and the lining concrete casting using the lining formwork 5 movably arranged with respect to the protector 2 in the work space 3. It is characterized by consisting of an installation process.

In this case, the protector 2 is, for example, a rectangle having a width of 4000 mm and a height of 4500 mm (including a shape in which the upper corner is chamfered) so as to secure a one-lane passage that allows the passage of vehicles. It is formed in a box shape so as to have an internal space of.
Then, the protector 2 travels on the rail 21 laid along the length direction of the tunnel 1, and can be intermittently moved in the length direction of the tunnel 1 by a moving device 22 such as a hydraulic jack. I have to.

Further, a cutting process using a cutting machine 4 equipped with a drum cutter 41 provided with a large number of bits on the peripheral surface for removing an inner wall surface 10A made of existing lining concrete to a predetermined thickness is usually 300 to 600 mm. Of the existing lining concrete with the thickness of, the part that needs repair due to damage such as cracking, peeling, floating, etc. of the concrete that generally occurs relatively often on the empty surface inside the tunnel, for example, the existing It is removed with a thickness of about 1/3 to 1/2 (100 to 300 mm) of the thickness of the lining concrete.
If the entire existing lining concrete needs to be repaired, all of it can be removed, and this is not excluded.

Then, this cutting step is performed in the circumferential direction of the inner wall surface 10A of the tunnel arranged so as to be movable with respect to the protector 2 in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. Two or more (three in this embodiment) drum cutters 41 arranged on the support member 42 formed in an arch shape along the support member 42 and the movable support base 43 movable along the support member 42 are provided. In the cutting machine 4, at least two of these drum cutters 41 (two in this embodiment) move the mounting position of the rotary support shaft of the drum cutter 41 with respect to the moving support 43. It is performed by using a cutting machine 4 provided so as to be biased in opposite directions with respect to the moving direction of 43. In this embodiment, one of the three drum cutters 41 located at the center has a mounting position of the rotation support shaft of the drum cutter 41 with respect to the moving support base 43 with respect to the moving direction of the moving support base 43. The cutting machine 4 provided without bias is used.
As a result, it is possible to perform cutting in a substantially wider range than the installation angle of the support member 42 formed in an arch shape (movement angle of the moving support base 43), and the inside made of the existing lining concrete. The cutting operation of removing the wall surface to a predetermined thickness can be performed in a single step up to, for example, the position of the bottom plate surface of the tunnel 1 including the stepped portion of the tunnel 1.
In addition, in order to stably install the arch-shaped support member 42, an outrigger device 44 that is grounded to the inner wall surface of the tunnel 1 is attached to the support member 42.
Further, as the drive mechanism of the cutting machine 4, an electric motor or a hydraulic motor can be selectively used according to the peripheral equipment and the working environment.
Further, in this embodiment, the main body of the cutting machine 4 is arranged on the protector 2, and the entire cutting machine 4 is arranged so as to be movable with respect to the protector 2, but the upper space is wide. In relation to this, the main body of the cutting machine 4 can be arranged in the lateral space of the protector 2.

Further, as a carry-out device 7 for carrying out the cutting chips generated by the cutting work of removing the inner wall surface 10A made of the existing lining concrete to a predetermined thickness, for example, a shuffler 71 or a cutting waste carrier 72 is used as an inner wall surface of the tunnel 1. It can be arranged so as to be able to travel in the work space 3 formed between the protector 2 and the outer wall surface of the protector 2.
As a result, the place where the cutting chips are carried out and the passage through which the vehicle passes can be completely separated, thereby improving safety.
Further, if necessary, a dust collector 73 for sucking dust generated by cutting work may be arranged in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. it can.

Further, in the repair and waterproof sheet construction steps of the inner wall surface construction work, a work cart 82 is arranged so as to be movable around the outer periphery of the protector 2 and formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. Workers are allowed to freely install waterproof sheets and reinforcing bars in the work space 3.

Further, in the inner wall surface construction work, the lining concrete placing process is arranged so as to be movable with respect to the protector 2 in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. The inner wall surface 10B made of new lining concrete having a thickness equivalent to the thickness of the existing lining concrete removed in the cutting process is constructed by using the lining formwork 5.
In this case, the concrete placing device such as the concrete pump 52 and the hardening material supply device 53 for placing the lining concrete in the lining form 5 via the mixing nozzle 51 is the inner wall surface of the tunnel 1 and the protector 2. The work space 3 formed between the outer wall surface and the outer wall surface of the concrete can be arranged so as to be able to travel, or the protector 2 can be fixedly installed.
In this case, the tact time (the time interval in which the protector 2 is intermittently moved in the length direction of the tunnel 1) is shortened by using hard concrete (fast-strength) concrete for the lining concrete to be cast. The construction period can be further shortened.
Regarding the concrete placing device such as the mixing nozzle 51 when the lining concrete to be placed is made of quick-hardening (fast-strength) concrete, a known technique (for example, Japanese Patent Application Laid-Open No. 8-135387) can be used as appropriate. Japanese Patent Application Laid-Open No. 8-135389, etc.) can be applied.

Further, in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2, if necessary, a step of removing equipment such as a lighting fixture and a ventilation device is performed before the cutting step. Or, after the cutting process, as a tunnel deformation countermeasure process, for example, a lock bolt is driven using a drilling machine 6, and after a lining concrete placing process, equipment such as lighting equipment and ventilation equipment is restored. The process can be performed.
Of these, the equipment removal process and restoration process are operations formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2 by arranging work carts 81 and 83 so as to be movable around the outer periphery of the protector 2. Workers are allowed to work freely in the space 3.
In this embodiment, the drilling machine 6 is arranged on the protector 2, but it may be arranged on the side space of the protector 2 in relation to the size of the upper space.

As described above, according to the method of reconstructing the lining part of the existing two-lane road tunnel, the construction cost is low, the construction period is short, the tunnel cross section R after repair does not shrink, and even during the repair, the inside of the tunnel (Specifically, the internal space of the protector 2 can be used to allow the passage of general vehicles (one-lane one-sided passage), and the tunnel lining part can be reconstructed under the live line. If it is possible to do so, or if there are two tunnels on the upper and lower lines, use another tunnel for general vehicles to pass during repair, and after completely closing the inside of the tunnel under repair, the protector 2 The cutting work is performed using a cutting machine 4 equipped with a drum cutter 41 having a large number of bits on the peripheral surface, while demonstrating the advantage that the construction vehicle can pass through the internal space. Durability consisting of cast lining concrete and precast concrete panels constructed using the lining mold 5 while preventing new defects such as cracks from occurring in the remaining part of the inner wall of the existing tunnel. It is possible to construct an excellent new inner wall surface.

3 to 4 show a second embodiment of the method for reconstructing the lining portion of the existing two-lane road tunnel of the present invention.
The method of reconstructing the lining part of the existing two-lane road tunnel is to install a protector 2 in the existing two-lane road tunnel 1 that secures a one-lane passage that allows vehicles to pass along the length direction of the tunnel 1. The existing lining in the work space 3 formed between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2 while the protector 2 is intermittently moved in the length direction of the tunnel 1. This is a method of reconstructing the lining part of an existing two-lane road tunnel so that the cutting work of removing the inner wall surface made of concrete to a predetermined thickness and the inner wall surface construction work of constructing a new inner wall surface are performed. The work consists of a cutting process using a cutting machine 4 equipped with a drum cutter 41 having a large number of bits on the peripheral surface, and the inner wall surface construction work is between the inner wall surface of the tunnel 1 and the outer wall surface of the protector 2. It consists of a repair and waterproof sheet construction process performed in the work space formed in the tunnel 2 and a precast concrete panel installation process (PCL process) using a precast concrete panel installation device (not shown) arranged behind the protector 2. It is characterized by.
Here, the renovation of the lining part can be performed on the inner wall surface 10A made of the existing lining concrete of the section that needs to be repaired, and the section that does not need to be repaired is made of the existing lining concrete. The construction can be carried out so that the inner wall surface 10A remains (the same applies to the method of reconstructing the lining portion of the existing two-lane road tunnel in the first embodiment).

In this case, the precast concrete panel installation device used in the precast concrete panel installation process is such that the precast concrete panel 10C can be installed while allowing the passage of vehicles by securing a passage of one lane. The method is not particularly limited, and a known precast concrete panel installation device can be used as appropriate.
Then, on the back side of the precast concrete panel 10C installed by the precast concrete panel installation device, an inner wall surface 10A made of the precast concrete panel 10C and the existing lining concrete cut by using the backfill mortar filling machine 9 is formed. Fill the voids with mortar.
After that, the restoration process of equipment such as lighting equipment and ventilation equipment can be performed.

As described above, according to the method of reconstructing the lining part of the existing two-lane road tunnel, the construction cost is low, the construction period is short, the tunnel cross section R after repair does not shrink, and even during the repair, the inside of the tunnel By using a cutting machine 4 equipped with a drum cutter 41 having a large number of bits on the peripheral surface, the remaining part of the inner wall of the existing tunnel can be cut while exhibiting the advantage of being able to secure the passage of the vehicle. It is possible to construct a new inner wall surface made of precast concrete panel 10C having excellent durability while preventing new defects such as cracks from occurring in the tunnel.
The other configurations and operations of the method for reconstructing the lining part of the existing two-lane road tunnel are the same as the method for reconstructing the lining part of the existing two-lane road tunnel according to the first embodiment.

The method of reconstructing the lining portion of the existing two-lane road tunnel of the present invention has been described above based on a plurality of examples, but the present invention is not limited to the configuration described in the above examples, and each embodiment. The configuration can be appropriately changed as long as the purpose is not deviated, such as by appropriately combining the configurations described in the examples.

The method of reconstructing the lining portion of the existing two-lane road tunnel of the present invention has a low construction cost, a short construction period, does not reduce the tunnel cross section after repair, and allows vehicles to pass through the tunnel even during repair. Since it has the property of being able to construct a new inner wall surface with excellent durability while exhibiting the advantage of being able to be secured, it is suitably used for the purpose of remodeling the lining part of an existing two-lane road tunnel. be able to.

1 Tunnel 2 Protector 3 Work space 4 Cutting machine 41 Drum cutter 42 Support member 43 Moving support stand 44 Out trigger device 5 Lining formwork 51 Mixing nozzle 52 Concrete pump 53 Hardener supply device 6 Drilling machine 7 Carrying out device 71 Shaflander 72 Cutting Waste carrier 73 Dust collector 81, 82, 83 Work trolley 9 Back-filled mortar filling machine 10A Tunnel inner wall surface (existing)
Inner wall surface of 10B tunnel (new construction)
10C precast concrete panel (new)

Claims (3)

In the existing two-lane road tunnel, a protector that secures a one-lane passage that allows the passage of vehicles is provided so as to be movable along the length direction of the tunnel, and the protector is intermittently moved in the length direction of the tunnel. While doing so, in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector, the inner wall surface made of existing lining concrete is removed to a predetermined thickness, and a new inner wall surface is constructed. It is a method of reconstructing the lining part of the existing two-lane road tunnel so that the inner wall surface construction work is performed.
The cutting work is a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, and is relative to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. Two or more drums arranged on a support member formed in an arch shape along the circumferential direction of the inner wall surface of the tunnel arranged so as to be movable and a movable support stand movable in the circumferential direction along the support member. A drum cutter provided with a cutter and arranged on one end side of the drum cutter sets the position of the rotary support shaft of the drum cutter with respect to the moving support in the circumferential direction of the moving support. The drum cutter, which is provided unevenly on one end side and arranged on the other end side, positions the rotation support shaft of the drum cutter with respect to the moving support base on the other side in the circumferential direction of the moving support base. By using a cutting machine that is provided unevenly on the end side of the machine, it consists of a cutting process that cuts in a range wider than the installation angle of the support member formed in an arch shape.
The inner wall surface construction work is lining concrete using a lining formwork arranged so as to be relatively movable with respect to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. A method of reconstructing the lining part of an existing two-lane road tunnel, which is characterized by a casting process. In the existing two-lane road tunnel, a protector that secures a one-lane passage that allows the passage of vehicles is provided so as to be movable along the length direction of the tunnel, and the protector is intermittently moved in the length direction of the tunnel. While doing so, in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector, the inner wall surface made of existing lining concrete is removed to a predetermined thickness, and a new inner wall surface is constructed. It is a method of reconstructing the lining part of the existing two-lane road tunnel so that the inner wall surface construction work is performed.
The cutting work is a cutting machine equipped with a drum cutter provided with a large number of bits on the peripheral surface, and is relative to the protector in the work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector. Two or more drums arranged on a support member formed in an arch shape along the circumferential direction of the inner wall surface of the tunnel arranged so as to be movable and a movable support stand movable in the circumferential direction along the support member. A drum cutter provided with a cutter and arranged on one end side of the drum cutter sets the position of the rotary support shaft of the drum cutter with respect to the moving support in the circumferential direction of the moving support. The drum cutter, which is provided unevenly on one end side and arranged on the other end side, positions the rotation support shaft of the drum cutter with respect to the moving support base on the other side in the circumferential direction of the moving support base. By using a cutting machine that is provided unevenly on the end side of the machine, it consists of a cutting process that cuts in a range wider than the installation angle of the support member formed in an arch shape.
A method for reconstructing a lining part of an existing two-lane road tunnel, wherein the inner wall surface construction work comprises a precast concrete panel installation process using a precast concrete panel installation device arranged behind a protector. A work space formed between the inner wall surface of the tunnel and the outer wall surface of the protector for carrying out a unloading device for carrying out cutting chips generated by a cutting operation for removing the inner wall surface made of the existing lining concrete to a predetermined thickness. The method for reconstructing the lining portion of an existing two-lane road tunnel according to claim 1 or 2, wherein the inside is arranged so as to be able to travel.

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