JP2020133184A - Installation method of rebar assembly for secondary tunnel lining - Google Patents

Abstract

To provide an installation method of a rebar assembly for a secondary tunnel lining, which is advantageous in reducing the labor for constructing the rebar for the secondary lining and increasing the labor saving of the secondary lining work of the tunnel.SOLUTION: A rebar assembly 30 having a width along the longitudinal direction of an inner surface of a primary lining concrete 14 and a length along the circumferential direction of the primary lining concrete 14 is divided into a divided rebar assembly 30A facing a top peripheral surface of the primary lining concrete 14, and divided rebar assemblies 30B and 30C facing left and right side peripheral surfaces of the primary lining concrete 14, respectively. By connecting these divided rebar assemblies, the rebar assembly 30 is assembled. Both ends of the rebar assembly 30 are displaced by jacks in a direction in which they approach each other. Both ends of the rebar assembly 30 are fixed to upper surfaces of both sides of an invert concrete 18 by supporting members so that this displaced state is maintained, and the rebar assembly 30 is installed inside the primary lining surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method of installing a reinforcing bar assembly for reinforcing a secondary lining concrete inside a primary lining concrete constituting a tunnel.

Conventionally, as a method of installing a reinforcing bar for secondary lining concrete inside a primary lining concrete, for example, a hole is made in a tarpaulin of a part covering a support work buried in the primary lining concrete of a tunnel, and this hole is made. There is known a method of stopping water by fixing an anchor bar for attaching a setup bar or the like to a support work through the support and covering the hole of the tarpaulin with a washer with a sealing material.
However, in such a construction method, the water-stopping property may be impaired due to deterioration or breakage of the sealing material. Therefore, a construction method in which setup bars or the like are arranged without making holes in the tarpaulin is adopted (for example, Patent Documents). 1).

In the construction method of Patent Document 1, first, the support work embedded in the primary lining concrete is attached with the holding metal fittings, and the support work including the holding metal fittings and the primary lining concrete are covered with a waterproof sheet. Next, the holding metal fitting is attached to the holding metal fitting covered with the waterproof sheet, and the anchor bar is further fixed to the holding metal fitting. Next, the setup bar and the main reinforcing bar are attached to the anchor bar.
In such a construction method, by installing anchor bars without forming holes in the waterproof sheet, it is possible to prevent water from the ground from entering the secondary lining concrete.

Japanese Unexamined Patent Publication No. 2004-150117

However, in the conventional method of installing the reinforcing bar for secondary lining as described above, in addition to the setup bar, a holding metal fitting for fixing the setup bar to the support, a holding metal fitting, and an anchor bar are used. There is a problem that the number increases, the structure becomes complicated, the cost increases, and the construction work also increases.
In addition, there are problems such as the waterproof sheet being torn when the sandwiching metal fitting is sandwiched between the tip of the sandwiched metal fitting covered with the waterproof sheet, and the work of covering with the waterproof sheet according to the shape of the tip of the sandwiched metal fitting is troublesome. The construction work is further increased, and the labor saving of the secondary lining work cannot be improved.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the number of parts required for installing reinforcing bars for secondary lining and the labor required for construction, and to save labor in the secondary lining work of a tunnel. It is an object of the present invention to provide a method of installing a reinforcing bar assembly for secondary lining of a tunnel, which is advantageous in enhancing the construction.

In order to achieve the above-mentioned object, the invention according to claim 1 has a width along the longitudinal direction of the tunnel primary lining surface and a circumferential direction of the tunnel primary lining surface along the tunnel primary lining surface. This is a method of installing a reinforcing bar assembly having a long length, and both ends of the reinforcing bar assembly located on the upper surfaces of both sides of the invert concrete on both sides in the width direction of the tunnel are displaced in a direction close to each other and displaced. It is characterized in that the reinforcing bar assembly is installed by maintaining the state.
The invention according to claim 2 is characterized in that both ends of the reinforcing bar assembly are held in a displaced state by fixing both ends of the reinforcing bar assembly to both sides of the invert concrete.
In the invention according to claim 3, jacks are arranged on the upper surfaces of both sides of the invert concrete so as to face the inside of both ends of the reinforcing bar assembly, and the displacement in the direction in which both ends of the reinforcing bar assembly are brought close to each other is It is characterized in that it is performed by the reduction operation of the jack.
In the invention according to claim 4, support members extending in the longitudinal direction of the tunnel primary lining surface and supporting both ends thereof are arranged at both ends of the reinforcing bar assembly facing the tunnel primary lining surface, and the reinforcing bar is provided. The displacement in the direction in which both ends of the assembly are brought close to each other is characterized in that the support member is reduced by the reduction operation of the jack, and after the reduction operation of the jack, the support member is fixed to both sides of the invert concrete.
The invention according to claim 5 is characterized in that the reinforcing bar assembly is configured by joining a plurality of divided reinforcing bar assemblies divided in the circumferential direction of the tunnel primary lining surface.
The invention according to claim 6 is characterized in that the plurality of divided reinforcing bar assemblies are assembled on a work carriage.
The invention according to claim 7 is characterized in that the work carriage has a reinforcing bar mounting portion on which a split reinforcing bar assembly facing the top peripheral surface of the tunnel primary lining surface is mounted.
In the invention according to claim 8, the reinforcing bar assembly is arranged at predetermined intervals in the longitudinal direction of the tunnel primary lining surface, and has a plurality of main reinforcing bars extending in the circumferential direction of the tunnel primary lining surface. It is characterized in that it includes a plurality of force distribution bars extending in the longitudinal direction of the primary lining surface of the tunnel and fixed to the main reinforcing bars.

According to the invention according to claim 1, the reinforcing bar assembly for secondary lining is displaced from the tunnel primary lining surface by displacing both ends of the reinforcing bar assembly located on the upper surfaces of both sides of the invert concrete of the tunnel in a direction close to each other. Can be installed along the circumferential direction of.
Therefore, setup parts such as setup bars and anchor bars are not required, the installation of the reinforcing bar assembly for secondary lining becomes easy, the construction work can be reduced, and the labor saving of the secondary lining work of the tunnel is enhanced. It will be advantageous on.
In the present invention, the reinforcing bar assembly for secondary lining is deformed along the circumferential direction of the primary lining surface of the tunnel by displacing both ends of the reinforcing bar assembly in a direction close to each other, and then the deformed reinforcing bar assembly is formed. May be fixed from the outer periphery of the tunnel, or may be fixed from the floor or the ground of the invert concrete, and the fixing method is arbitrary, but as in the invention of claim 2, both ends of the reinforcing bar assembly are fixed on both sides of the invert concrete. When fixed to the part, the reinforcing bar assembly for secondary lining can be held along the circumferential direction of the primary lining surface of the tunnel without taking up space, facilitating the installation of the reinforcing bar assembly and the second part of the tunnel. It is advantageous in improving labor saving in the next lining work.
According to the inventions of claims 3 and 4, since both ends of the reinforcing bar assembly are displaced in the direction of approaching each other by the reduction operation of the jack, the displacement operation of the reinforcing bar assembly for secondary lining becomes easy, and the two of the tunnels are It is advantageous in improving labor saving in the next lining work.
According to the inventions of claims 5, 6, 7, and 8, it is easy to carry the rebar assembly for secondary lining into the tunnel, and moreover, a plurality of divided rebar assemblies are assembled on the work carriage. This is advantageous in facilitating the installation of the reinforcing bar assembly and increasing the labor saving of the secondary lining work of the tunnel.

It is sectional drawing for explanation of the tunnel to which the installation method of the reinforcing bar assembly for secondary lining of a tunnel which concerns on one Embodiment of this invention is applied. For explanation when a plurality of divided reinforcing bar assemblies constituting the reinforcing bar assembly are divided into a reinforcing bar portion facing the top peripheral surface of the tunnel primary lining surface and a reinforcing bar portion facing the left and right both peripheral surfaces of the tunnel primary lining surface. It is a perspective view. It is explanatory perspective figure at the time of assembling a plurality of divided reinforcing bar assemblies on a work cart to form a reinforcing bar assembly. It is explanatory perspective view of the case where both ends of the reinforcing bar assembly are displaced in the direction of approaching each other, and both ends of the reinforcing bar assembly are fixed to the invert concrete of the tunnel so that this displacement state is maintained. It is an enlarged view of the main part which shows the connection state to the support member of the main reinforcing bar end part. (A) and (b) are explanatory views in the case where the main reinforcing bars constituting the reinforcing bar assembly are installed inside the tunnel primary lining surface.

Hereinafter, embodiments that embody the installation method of the tunnel secondary lining reinforcing bar assembly according to the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, inside the ground 10 after the tunnel 12 is excavated in the ground 10, a support work (not shown) formed in an arch shape is installed at a predetermined pitch in the longitudinal direction of the tunnel 12. After that, the primary lining concrete 14 is formed by spraying concrete between the adjacent supports, and the waterproof sheet 16 is set on the inner surface of the support and the inner surface of the primary lining concrete 14. Then, according to the method of the present invention, a reinforcing bar assembly 30 which is a reinforcing bar of the secondary lining concrete is installed inside the primary lining concrete 14 after the waterproof sheet 16 is set over the entire length in the longitudinal direction of the tunnel 12. Will be done.

As shown in FIG. 1, the reinforcing bar assembly 30 has a width along the longitudinal direction of the tunnel primary lining surface, that is, the inner surface of the primary lining concrete 14 (hereinafter, referred to as the primary lining concrete) in which the tarpaulin 16 is set. And, it has a length along the circumferential direction of the primary lining concrete 14.
Further, as shown in FIGS. 2 and 3, the reinforcing bar assembly 30 is arranged at predetermined intervals in the longitudinal direction of the primary lining concrete 14, and extends in the circumferential direction of the primary lining concrete 14. In the present embodiment, the main reinforcing bars 3002 (three) and a plurality of force distribution bars 3004 extending in the longitudinal direction of the primary lining concrete 14 and fixed to the main reinforcing bars 3002 are included.

Further, as shown in FIGS. 2 and 3, the reinforcing bar assembly 30 is divided into three in the circumferential direction of the primary lining concrete 14, that is, the divided reinforcing bar assembly 30A facing the top peripheral surface of the primary lining concrete 14. The primary lining concrete 14 is composed of divided reinforcing bar assemblies 30B and 30C facing the left and right side peripheral surfaces, respectively.
Then, in these split reinforcing bar assembly 30, the upper ends of the main reinforcing bars 3002 of the split reinforcing bar assembly 30B and 30C are connected to both ends of the main reinforcing bar 3002 of the split reinforcing bar assembly 30A by, for example, the number line 3006 as shown in FIG. As a result, the reinforcing bar assembly 30 is configured.

The reinforcing bar assembly 30 for primary lining installed inside the primary lining concrete 14 has the structure shown in FIG. 3, but in FIG. 1, the reinforcing bars are assembled inside the primary lining concrete 14. In order to clearly show the installation state of the body 30, particularly the arrangement state of the main reinforcing bars 3002, the state in which the distribution bars 3004 are omitted from the main reinforcing bars 3002 and the force distribution bars 3004 constituting the reinforcing bar assembly 30 is shown. ..

In the state before the reinforcing bar assembly for the secondary lining is arranged inside the primary lining concrete 14, invert concrete is constructed at the bottom of the tunnel 12 as shown in FIG. 1, and the width of the tunnel 12 is wide. A road surface 20 is formed inside the invert concrete side portions 18 on both sides in the direction.
On the road surface 20, a rail 25 for running the work cart 22 is laid along the longitudinal direction of the tunnel 12.
The work carriage 22 is configured to move in the longitudinal direction of the tunnel 12 by a towing vehicle (not shown) capable of automatically traveling on the rail 25 or the road surface 20.

The work trolley 22 is mainly used for assembling the secondary lining reinforcing bar assembly work, transporting the secondary lining reinforcing bar, etc., and has an underframe 2202 formed by combining shaped steel materials in a rectangular shape. Four left and right leg portions 2204 provided vertically downward at the four corners of the underframe 2202 and two left and right leg portions 2204 respectively provided at the lower ends of the left and right leg portions 2204, respectively, and roll on the left and right rails 25 so as to be able to travel. It is composed of two wheels 2206, a reinforcing bar mounting portion 2208 installed on the upper surface of the underframe 2202, and work scaffolding 2210 provided on both the left and right sides of the work cart 22.
As shown in FIG. 1, the upper surface of the reinforcing bar mounting portion 2208 has an arch shape corresponding to the top shape of the inner peripheral surface of the primary lining concrete 14, and further, the main reinforcing bar 3002 constituting the reinforcing bar assembly 30. Has a length that allows a plurality of tunnels 12 to be arranged at regular intervals in the longitudinal direction of the tunnel 12.

In particular, the upper surface shape of the reinforcing bar mounting portion 2208 is formed in an arch shape having a curvature corresponding to the arch shape of the main reinforcing bar 3002 of the divided reinforcing bar assembly 30A facing the peripheral surface of the top of the primary lining concrete 14.
Further, the radius of curvature of the arch shape of the main reinforcing bar 3002 in the divided reinforcing bar assembly 30A is set to be larger than the radius of curvature of the inner peripheral surface of the top of the primary lining concrete 14.
The reason is that, as shown in FIG. 4, the reinforcing bar assembly 30 is subjected to the primary lining concrete 14 by utilizing the bending stress generated in the divided reinforcing bar assembly 30A when both ends of the reinforcing bar assembly 30 are displaced in the direction of approaching each other. This is for stable installation inside the.
Further, in FIG. 4, the support member 24 supports both ends of the reinforcing bar assembly 30 when the both ends of the reinforcing bar assembly 30 for primary lining are displaced in a direction of approaching each other, and both ends of the reinforcing bar assembly 30 are displaced. It is for maintaining the state, and is arranged on the upper surfaces of the left and right invert concrete side portions 18 along the longitudinal direction of the tunnel 12.

Next, a method of installing the reinforcing bar assembly 30 for secondary lining will be described.
First, the work trolley 22 loaded with the reinforcing bars and the like necessary for installation in the secondary lining reinforcing bar assembly 30 is moved to the assembly position of the secondary lining reinforcing bars in the tunnel 12.
Next, the split reinforcing bar assemblies 30B and 30C are arranged facing the left and right side peripheral surfaces of the primary lining concrete 14, respectively, and the lower ends of the main reinforcing bars 3002 of the split reinforcing bar assemblies 30B and 30C are placed on both sides of the left and right invert concretes. It is fixed to each of the support members 24 arranged on the upper surface of the portion 18.
As shown in FIG. 5, the support member 24 in this case includes an angle member 2402 extending in the length direction of the primary lining surface and a holding member 2404, and the lower end of the main reinforcing bar 3002 is formed with a vertical piece 2402a of the angle member 2402. The lower end of the main reinforcing bar 3002 can be fixed to the support member 24 by sandwiching it between the holding members 2404 and tightening it with the fixing screw 2406.
The distance between the main reinforcing bars 3002 fixed to the support member 24 in the tunnel longitudinal direction is set to a value required for the reinforcement arrangement of the secondary lining.

Next, the arch-shaped split reinforcing bar assembly 30A is placed on the upper surface of the reinforcing bar mounting portion 2208 according to the arch shape, and both ends of the main reinforcing bar 3002 of the split reinforcing bar assembly 30A and the split reinforcing bar assemblies 30B and 30C The upper ends of the main reinforcing bars 3002 are overlapped with each other. In this state, the main reinforcing bars 3002 overlapped with each other are bound by a worker standing by on the work scaffold 2210 at the number line 3006, and the divided reinforcing bar assemblies 30A, 30B, and 30C are connected as shown in FIG. ..
In this case, the positional relationship between the inner peripheral surface of the primary lining concrete 14, the split reinforcing bar assembly 30A, and the split reinforcing bar assemblies 30B and 30C is as shown in FIG. 6A. That is, since the split reinforcing bar assembly 30A is processed to have a radius of curvature larger than the radius of curvature of the inner peripheral surface of the top of the primary lining concrete 14, the top of the split reinforcing bar assembly 30A is the inner circumference of the top of the primary lining concrete 14. Placed at a greater distance than normal from the surface.
On the other hand, the lower ends of the divided reinforcing bar assemblies 30B and 30C are placed in a state of substantially contacting the lower ends of the inner circumference of the primary lining concrete 14.

The arrangement interval of the main reinforcing bars 3002 in the split reinforcing bar assembly 30A in the tunnel longitudinal direction is set to the same arrangement interval as the main reinforcing bars 3002 in the divided reinforcing bar assemblies 30B and 30C.
Further, the fixing work of the distribution reinforcing bar 3004 to be assembled to the main reinforcing bars 3002 of the divided reinforcing bar assemblies 30A, 30B and 30C is performed after the main reinforcing bars of the divided reinforcing bar assemblies 30A, 30B and 30C are connected to each other. Of the divided reinforcing bar assemblies 30A, 30B and 30C assembled outside the tunnel as shown in FIG. 2, the divided reinforcing bar assembly 30A is placed on the reinforcing bar mounting portion 2208 of the work cart 22. After placing and arranging the split reinforcing bar assemblies 30B and 30C along the left and right inner peripheral surfaces of the primary lining concrete 14, both ends of the main reinforcing bars 3002 of the split reinforcing bar assembly 30A and the split reinforcing bar assemblies 30B and 30C The upper end of the main reinforcing bar 3002 may be connected.
When assembled outside the tunnel, the support member 24 is also fixed to the lower ends of the main reinforcing bars 3002 of the divided reinforcing bar assemblies 30B and 30C.

Next, a case where the reinforcing bar assembly 30 in the state shown in FIG. 6A is installed inside the primary lining concrete 14 in a fixed state will be described.
In this case, as shown in FIG. 4, first, the jacks 26 are placed on the upper surfaces of the left and right invert concrete side portions 18 of the tunnel so as to face the insides of the left and right lower ends of the reinforcing bar assembly 30, respectively, and then each of them. The jack 26 is connected to the corresponding support member 24 via the coupling member 28. In this state, both the left and right jacks 26 are synchronized with each other and are reduced by the same pulling force. Along with this, both the left and right lower ends of the reinforcing bar assembly 30 including the support member 24 are displaced in the direction of the arrow shown in FIG. 6A. That is, both the left and right lower ends of the reinforcing bar assembly 30 are simultaneously displaced in the direction of approaching each other against the bending stress of the split reinforcing bar assembly 30A. Along with this, as shown in FIG. 6B, the split reinforcing bar assembly 30A is deformed into an upwardly convex curved shape, and at the same time, has a shape along the curved surface of the inner peripheral surface of the top of the primary lining tunnel 14. It is curved. As a result, the entire reinforcing bar assembly 30 is installed along the inner peripheral surface of the primary lining tunnel 14 at regular intervals.

Next, the left and right support members 24 are inserted into the invert concrete side portions 18 by driving nails (not shown) into the invert concrete side portions 18 through the holes 2408 drilled in the horizontal pieces 2402b of the angle member 2402 of the left and right support members 24. Fix on the top surface of. As a result, the reinforcing bar assembly 30 can be held in an upwardly convex curved shape along the curved surface in the circumferential direction of the primary lining tunnel 14 without using a setup bar or an anchor bar.
After the reinforcing bar assembly 30 is installed inside the primary lining tunnel 14, the jack 26 is removed and the process proceeds to the next installation work of the reinforcing bar assembly 30.

According to this embodiment, the following effects are achieved.
A reinforcing bar assembly 30 having a width along the longitudinal direction of the inner surface of the primary lining concrete 14 and a length along the circumferential direction of the primary lining concrete 14 faces the top peripheral surface of the primary lining concrete 14. The divided reinforcing bar assembly 30A and the divided reinforcing bar assembly 30B and 30C facing the left and right side peripheral surfaces of the primary lining concrete 14, respectively, are divided, and the reinforcing bar assembly 30 is connected by connecting these divided reinforcing bar assemblies. Assembled, both ends of the reinforcing bar assembly 30 are displaced in a direction closer to each other by the jack 26, and both ends of the reinforcing bar assembly 30 are placed on the upper surface of both side portions 18 of the invert concrete by the support member 24 so that the displaced state is maintained. Since the reinforcing bar assembly 30 is fixed and installed inside the primary lining concrete 14, installation parts such as the conventionally used setup bars and anchor bars are no longer necessary, and the setup bars and anchor bars are installed. The reinforcing bar assembly 30 can be stably installed inside the primary lining concrete 14 without using it, and the secondary lining reinforcing bar assembly 30 can be easily installed, the construction work can be reduced, and the tunnel can be installed. This is advantageous in improving labor saving in secondary lining work.

Further, according to the present embodiment, the reinforcing bar assembly 30 faces the split reinforcing bar assembly 30A facing the top peripheral surface of the primary lining concrete 14 and the left and right side peripheral surfaces of the primary lining concrete 14, respectively. Since it can be divided into the divided reinforcing bar assembly 30B and 30C, it is easy to install the secondary lining reinforcing bar assembly, carry the divided reinforcing bar assembly 30 into the tunnel 12 and on the work trolley 22, and handle the divided reinforcing bar assembly 30. This is even more advantageous in improving labor saving in secondary lining work.
Further, according to the present embodiment, since the reinforcing bar mounting portion 2208 on which the split reinforcing bar assembly 30A is mounted is provided on the upper portion of the underframe 2202 of the work cart 22, the split reinforcing bar assembly 30A is primarily covered. Accurate and stable placement of the work concrete 14 on the inner peripheral surface of the top is possible, and as a result, both ends of the split reinforcing bar assembly 30A and the split reinforcing bar assemblies 30B and 30C are placed on the work cart 22. The connection becomes easy, which is further advantageous in increasing the labor saving of the secondary lining work.
Further, according to the present embodiment, both ends of the reinforcing bar assembly 30 located on the upper surface of both side portions 18 of the invert concrete, that is, the lower ends of the plurality of main reinforcing bars 3002 are supported and integrated by the respective support members 24. , Both ends of the reinforcing bar assembly 30 can be stably displaced in the direction of approaching each other.

In the above embodiment, the case where the reinforcing bar assembly 30 for secondary lining is divided into three parts has been described, but the present invention is not limited to this, and the ease of installation work of the reinforcing bars for secondary lining and the tunnel. It goes without saying that the reinforcing bar assembly for secondary lining may be divided into two or three or more depending on the scale.
Further, in the above embodiment, the case where a plurality of main reinforcing bars 3002 constituting the reinforcing bar assembly 30 are used has been described, but the method of the present invention is not limited to this. For example, it is also possible to construct a secondary lining reinforcing bar assembly using a single real main reinforcing bar 3002 processed into an arch shape corresponding to the inner peripheral surface of the tunnel primary lining surface.
In this case, after the arch-shaped main reinforcing bars 3002 are arranged on the reinforcing bar mounting portion 2208 of the work cart 22 at regular intervals in the longitudinal direction of the tunnel 12, the force distribution bars 3004 are placed on the main reinforcing bars 3002 on the primary lining surface of the tunnel. The reinforcing bar assembly 30 is formed by extending and fixing in the longitudinal direction. Then, both ends of the reinforcing bar assembly 30 located on the upper surface of both side portions 18 of the invert concrete are displaced in a direction approaching each other by using the jack 26 and the support member 24 shown in the above embodiment, and the support members 24 are displaced on both side portions of the invert concrete. If the above displacement is maintained by fixing to the upper surface of 18, the reinforcing bar assembly 30 can be installed inside the primary lining surface as in the case described in the above embodiment.
Further, in the above embodiment, the case where both ends of the main reinforcing bar 3002 of the split reinforcing bar assembly 30A and the upper ends of the main reinforcing bars 3002 of the split reinforcing bar assemblies 30B and 30C are connected by the number line 3006 has been described. Not limited to. For example, a method may be used in which the joint ends of the main reinforcing bars 3002 are press-fitted into both ends of the pipe-shaped joint fitting to be connected, and the method of connecting the divided main reinforcing bars 3002 to each other is not limited.
Further, the support members 24 attached to both ends of the reinforcing bar assembly 30 are not limited to those having the structure shown in the above embodiment, and the main reinforcing bars which are both ends of the reinforcing bar assembly 30 located on the upper surface of both side portions 18 of the invert concrete. The shape and structure of the 3002 are arbitrary as long as they can support the lower end of the 3002 integrally.
Further, in the above embodiment, the jack 26 is used as a means for displacing both ends of the reinforcing bar assembly 30 in the direction of approaching each other, but it goes without saying that the present invention is not limited to this.

10 Ground 12 Tunnel 14 Primary lining concrete 16 Tarpaulin 18 Invert concrete Both sides 20 Road surface 22 Work trolley 2202 Underframe 2208 Reinforcing bar mounting part 24 Support member 26 Jack 30 Reinforcing bar assembly 30A, 30B, 30C Split reinforcing bar assembly 3002 Main rebar 3004 Distributor bar 3006

Claims (8)

A method of installing a reinforcing bar assembly having a width along the longitudinal direction of the tunnel primary lining surface and a length along the circumferential direction of the tunnel primary lining surface along the tunnel primary lining surface.
Both ends of the reinforcing bar assembly located on the upper surfaces of both sides of the invert concrete on both sides in the width direction of the tunnel are displaced in a direction close to each other, and the displaced state is maintained to install the reinforcing bar assembly. ,
A method of installing a reinforcing bar assembly for secondary tunnel lining, which is characterized by this. The displaced state of both ends of the reinforcing bar assembly is maintained by fixing both ends of the reinforcing bar assembly to both sides of the invert concrete.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to claim 1. Jacks are placed on the upper surfaces of both sides of the invert concrete so as to face each other inside both ends of the reinforcing bar assembly.
The displacement of the reinforcing bar assembly in the direction in which both ends are brought close to each other is performed by the reduction operation of the jack.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to claim 1. Support members extending in the longitudinal direction of the tunnel primary lining surface and supporting both ends thereof are arranged at both ends of the reinforcing bar assembly facing the tunnel primary lining surface.
The displacement of the reinforcing bar assembly in the direction in which both ends are brought close to each other is performed by the reduction operation of the jack.
After the reduction operation of the jack, the support member is fixed to both sides of the invert concrete.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to claim 3, wherein the reinforcing bar assembly is installed. The reinforcing bar assembly is configured by joining a plurality of divided reinforcing bar assemblies divided in the circumferential direction of the tunnel primary lining surface.
Reinforcing bar assembly for secondary lining of a tunnel according to any one of claims 1 to 4, wherein the reinforcing bar assembly is characterized. The plurality of split reinforcing bar assemblies are assembled on a work cart.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to claim 5. The work carriage has a reinforcing bar mounting portion on which a split reinforcing bar assembly facing the top peripheral surface of the tunnel primary lining surface is mounted.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to claim 6. The reinforcing bar assembly is arranged at predetermined intervals in the longitudinal direction of the tunnel primary lining surface, and extends in the circumferential direction of the tunnel primary lining surface to a plurality of main reinforcing bars and in the longitudinal direction of the tunnel primary lining surface. It is composed of a plurality of force distribution bars extending and fixed to the main reinforcing bar.
The method for installing a reinforcing bar assembly for secondary lining of a tunnel according to any one of claims 1 to 7, characterized in that.

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