JP2820854B2 - Pier for tunnel construction, invert construction method and tunnel construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier for tunnel construction and a pier for tunnel construction, which can be bridged in a construction area such as an invert construction carried out in a tunnel during excavation so that vehicles and the like can move in and out of the construction area. The present invention relates to an invert construction method using a pier and a tunnel construction method.

[0002]

2. Description of the Related Art NATM (New Austrian tunnel method) is widely used as a tunnel method. This N
ATM is a method in which excavation proceeds while maintaining the stability of the excavated cross section by reinforcing the ground with rock bolts and lining the excavated surface with thin shotcrete. Generally NAT
In M, a bench-cut method is widely used in which the upper half and the lower half of the tunnel are excavated with a distance difference in the longitudinal direction of the tunnel. As shown in FIG. 11, a rock drill 43 is arranged on the upper half face 42 of the tunnel 41 to excavate the upper half, and a wellhead side at a predetermined distance from the position of the upper half face 42 (see FIG. 11). A rock drill 45 and a blowing robot 46 are disposed at a position (rightward side), that is, at the lower half face 44.

[0003] In the tunnel excavation process, an invert construction is performed in which invert concrete is partially cast in the longitudinal direction of the tunnel in order to reinforce the tunnel in accordance with rock types, ground conditions, and the like. When the invert construction is performed, vehicles and the like cannot pass through the construction area of the invert. Therefore, the pier 47 for tunnel construction is bridged in the construction area of the invert so that vehicles and the like can pass.

On the pit side of the upper half face 42 and the lower half face 44, a space for evacuation and movement of machines and vehicles is required in addition to a work space for excavation, rock bolt construction, concrete spraying work and the like. Therefore, the invert construction is usually performed at a wellhead side position at least 50 m from the positions of the upper half face 42 and the lower half face 44. When the invert construction is performed, a rock drill and a spray robot are required, and the excavator and the spray robot used in the face portion are used together for the invert construction.

[0005]

However, when the inverting operation is performed, the rock drill 43 and the blowing robot 46 used in the face portion are used for the inverting operation. Progress stagnates significantly. In this case, a rock drill for the upper half is used in the lower half as necessary, but stagnation of the excavation progress at the face portion is inevitable. As a result, when the invert construction is performed, there is a problem that the excavation efficiency of the tunnel 41 is reduced. Further, since there is a distance of 50 m or more from the face to the inverting position as described above, useless time is spent for moving various machines. As a result, the excavation efficiency of the tunnel 41 has been further reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a pier for tunnel construction and an invert which prevent the excavation at the cutting face from stagnating when the invert construction is performed. It is to provide a construction method and a tunnel construction method.

[0007]

According to the present invention, in order to solve the above-mentioned problems, in a tunnel under excavation, a work area including rock bolt construction performed on a wellhead side from a face in a tunnel during excavation. A rock drilling device for rock drilling for rock bolt construction is provided on a tunnel construction pier that is bridged over the construction area so that vehicles and the like can pass in the longitudinal direction of the tunnel.

According to the second aspect of the present invention, in the tunnel being excavated, the construction work is performed so that a vehicle or the like can pass through a construction area accompanied by a concrete spraying operation performed on the wellhead side from the face in the longitudinal direction of the tunnel. The pier for tunnel construction which is built over the area was equipped with a spraying device for spraying concrete on the excavated surface of the tunnel.

According to the third aspect of the present invention, in a tunnel during excavation, a vehicle or the like can pass through a construction area involving rock bolting and concrete spraying performed on the wellhead side from the face in the longitudinal direction of the tunnel. As described above, the pier for tunnel construction which is bridged over the construction area is provided with a rock drilling device for rock drilling for rock bolt construction, and a spraying device for spraying concrete on the excavated surface of the tunnel.

[0010] In the invention according to the fourth aspect, the inverting is performed by placing invert concrete on the wall surface of the tunnel excavated on the wellhead side from the face, and the inverting is performed by setting a tunnel construction pier in the invert construction area. In the construction method, a rock drilling device and a spraying device are provided on a pier for tunnel construction that is bridged over a construction area for invert construction, and rock drilling for rock bolt construction in the construction area for invert construction is performed by the rock drilling apparatus. The concrete was sprayed on the excavated surface of the tunnel by the spraying device.

According to the fifth aspect of the present invention, the tunnel excavation is divided into an upper half and a lower half, and the upper half face is positioned forward of the lower half face in the tunnel excavation traveling direction. In the construction method, a pier for tunnel construction equipped with a rock drilling device and a spraying device is bridged between the upper half and the lower half, and rock drilling for rock bolt construction on the lower half after excavation is performed by the rock drilling device. At the same time, the concrete was sprayed on the lower excavation surface by the spraying device.

[0012]

According to the first aspect of the present invention, rock drilling work in rock bolt construction performed in a construction area accompanied by rock bolt construction performed on the wellhead side from the face is performed by a tunnel bridged in the construction area. It is performed by rock drilling equipment provided on the pier for construction. Therefore, the rock drill used in the face portion is not used in the construction. As a result, even when the construction is performed, the progress of the excavation work on the face is not delayed.

According to the second aspect of the present invention, the concrete spraying work performed in the construction area accompanied by the concrete spraying work performed on the wellhead side from the face is performed by a tunnel construction pier bridged in the construction area. This is performed by a spraying device provided in the apparatus. Therefore, the spraying machine used for the face portion is not used in the construction. As a result, even when the construction is performed, the progress of the excavation work on the face is not delayed.

According to the third aspect of the present invention, the lock bolt construction performed on the wellhead side from the face and the rock bolt construction performed in the construction area accompanied by the concrete spraying work are performed in a tunnel construction spanning the construction area. It is performed by rock drilling equipment provided on the pier. The concrete spraying operation performed in the construction area is performed by a spraying device provided on a pier for tunnel construction. Therefore,
Rock drills and sprayers used in the face section will not be used in the construction. As a result, even when the construction is performed, the progress of the excavation work on the face is not delayed.

According to the fourth aspect of the present invention, the rock drilling work accompanying the rock bolt construction performed in the invert construction area is performed by a rock drilling apparatus provided on a tunnel construction pier bridged in the construction area. It is performed by Further, the work of spraying concrete on the excavation surface of the tunnel performed in the construction area is performed by a spraying device provided on a pier for tunnel construction. Therefore, since the rock drilling machine and the spraying machine used in the face portion are not used in the inverting work, the progress of the excavation work in the face is not delayed even when the inverting work is performed.

According to the fifth aspect of the present invention, the rock drilling work accompanying the rock bolt construction performed in the excavated lower half is a tunnel for invert construction bridged between the upper half and the lower half. It is performed by rock drilling equipment provided on the pier for construction. The concrete spraying work performed in the excavated lower half is performed by a spraying device provided on a pier for tunnel construction for invert construction. Therefore, the construction of the lower half of the bolt and the spraying of the concrete, and the inversion are performed below the pier for tunnel construction. Further, the rock bolt construction and concrete spraying work accompanying the invert construction are replaced with the lower half rock bolt construction and concrete spraying work. Therefore,
Rock bolt construction and concrete spraying work accompanying the invert construction are omitted.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a pier for tunnel construction embodying the present invention is applied to NATM will be described below with reference to FIGS.

As shown in FIG. 4, ground excavation is carried out by a rock drill 3 arranged on the upper half face 2 in the tunnel 1, and the upper half face 2 is excavated. Concrete is sprayed on the cut surface, and a sprayed concrete layer 1a as shown in FIG. 1 is formed on the inner wall of the tunnel 1. As shown in FIG. 4, the lower half face 5 is located at a predetermined distance from the upper half face 2 on the pit side (rightward side in the figure), and the bottom surface 1b of the tunnel 1 is
Has a step-like shape at the part. That is, in the tunnel 1, an upper half 6 is formed on the left side of the figure with the lower half face 5 as a boundary, and a lower half 7 is formed in addition to the upper half 6 on the right side of the figure. On the side, almost the entire cross section of the tunnel 1 is excavated. The area shown in the figure with respect to the total excavation length of the tunnel 1 is an invert construction area, and a predetermined range of the bottom surface 1b extending from the position on the pit side by a predetermined distance from the lower half face 5 to the right in the figure. Is formed with an invert 8.

At the step formed as the lower half face 5,
A movable pier 9 is bridged so as to connect the bottom 1b of the upper half 6 and the bottom 1b of the lower half 7. The first of mobile pier 9
An end (the left end in the drawing) is supported by the bottom surface 1b of the upper half 6 and a second end (the right end in the drawing) is an invert 8 formed on the bottom surface 1b of the lower half 7. It is supported on the upper surface. The movable pier 9 allows vehicles and the like to run, and the vehicles and the like can be moved through the movable pier 9 to the bottom surface 1b of the upper half 6.
And the bottom half 1 b of the lower half 7.
Below the bridged mobile pier 9, excavation work of the lower half face 5 and spraying of concrete on the work surface of the excavated lower half 7 are performed, and the invert concrete forming the invert 8 is driven. Installation work is being performed.

As shown in FIGS. 1 and 2, the movable pier 9 comprises a gantry 10 extending in the longitudinal direction of the tunnel 1 and two trolleys 11 for mounting and supporting the gantry 10 at both ends in the longitudinal direction. ing. The gantry 10 includes a bottom plate 12 serving as a traveling path of a vehicle or the like, and side plates 13 formed along both sides of the bottom plate 12 in the width direction (left-right direction in FIG. 3) along the longitudinal direction. Further, two outriggers 14 shown in FIG. 2 are fixedly provided on both sides in the longitudinal direction of the gantry 10 at positions corresponding to the respective side plates 13. The outrigger 14 has a hydraulic jack 14a. The cart 11 is composed of a mounting table 15 and wheels 16 arranged on the lower surface of the mounting table 15 on the both sides in the width direction, each set of four wheels. The movable pier 9 is normally supported by each outrigger 14 by extending the hydraulic jack 14a to an extended state, and is supported by each wheel 16 by moving the hydraulic jack 14a to a contracted state when the movable pier 9 is moved. It has become.
That is, when the hydraulic jacks 14a of the outriggers 14 are extended and retracted, the wheels 16 of the bogie 11 are separated from the bottom surface 1b when the hydraulic jacks 14a are extended, and the wheels 16 are retracted when the hydraulic jacks 14a are contracted.
Is in contact with the bottom surface 1b.

As shown in FIG. 2, the mounting table 15 of the cart 11
, A hydraulic cylinder 17 is provided so as to extend and contract in the width direction of the mounting table 15. On the lower surface of the gantry 10, a protrusion 1 is provided at a position corresponding to the tip of the piston 17a of the hydraulic cylinder 17.
0a is formed, and the tip of the piston 17a is
The hydraulic cylinder 17 is in an extended state when the gantry 10 and the cart 11 are in the positional relationship shown in FIG. That is, the gantry 10 and the trolley 11 are relatively movable in the width direction by expanding and contracting the hydraulic cylinder 17 disposed on the mounting table 15 of the trolley 11.

[0022] Also, the elevation frame 18 on both sides in the longitudinal direction of the bottom plate 12 is joined pivotally to the frame 10, the piston 19a of the hydraulic cylinder 19 disposed in brackets formed on both longitudinal sides of the side plate 13 Is fixed to the side of the lift 18. The elevating table 18 can be moved up and down around the joint with the bottom plate 12 by the expansion and contraction operation of the hydraulic cylinder 19. That is, the tip of the lift 18 is separated from the bottom surface 1b of the tunnel 1 when the hydraulic cylinder 19 is contracted, and the tip of the lift 18 contacts the bottom 1b when the hydraulic cylinder 19 is extended.

On the other hand, at the center of the lower surface of the gantry 10, two support boxes 20 whose lower surfaces are substantially open are arranged in parallel along the longitudinal direction of the gantry 10. As shown in FIG. 3, running rails 21 and 22 are installed on the lower surface of the bottom plate 12 in each support box 20 so as to extend along the longitudinal direction. A rock drilling device 23 is movably supported on the traveling rail 21 in a suspended state on the traveling rail 21 on the left side of FIG. A spraying device 24 is supported on the traveling rail 22 on the right side of FIG.

The rock drilling device 23 includes a main body 25 and a rock drilling boom 26.
, And is engaged with the traveling rail 21 via a plurality of pairs of rollers 25b provided rotatably with respect to a bracket 25a fixedly provided on the upper surface of the main body 25. The rock drilling boom 26 is composed of an arm 26a and a rock drilling head 26b. The arm 26a is capable of oscillating at its tip end centering on a base end joined to the main body 25. It is possible to arbitrarily move within a predetermined working range with the swinging motion. Further, the rock drilling head 26b is joined to the arm 26a so as to be able to swing in all directions by a predetermined angle. The swinging motion of the arm 26a and the rocking motion of the rock drilling head 26b are performed via hydraulic cylinders provided at each joint. The travel control and rock drilling control of the rock drilling device 23 are performed by a hydraulic unit and a control device (not shown) housed in the main body 25.

The spraying device 24 comprises a main body 27 and a spraying boom 28, and a plurality of pairs of rollers 27b rotatably provided on a bracket 27a fixed to the upper surface of the main body 27. And is engaged with the traveling rail 22. The spraying boom 28 includes an arm 28a and a spraying head 28b. The arm 28a is capable of oscillating at the distal end side around a joint base end with the main body 27, and the spraying head 28b is a neck of the arm 28a. It is possible to arbitrarily move within a predetermined working range with the swinging motion. Further, the blowing head 28b is joined to the arm 28a so as to be swingable in all directions by a predetermined angle. The swinging movement of the arm 28a and the swinging movement of the spray head 28b are performed via hydraulic cylinders provided at each joint. The travel control and rock drilling control of the spraying device 24 are performed by a hydraulic unit and a control device (not shown) housed in the main body 27.

The rock drilling device 23 and the blasting device 24 are retracted to the rearmost positions with respect to the respective traveling rails 21 and 22 to be the original positions. During rock drilling work, the rock drilling device 23 travels forward on the traveling rail 21 to a predetermined position to perform excavation work, and the spraying device 24 stands by at the original position. At the time of the spraying operation, the spraying device 24 travels forward on the traveling rail 22 to a predetermined position to perform the spraying operation, and the rock drilling device 23 stands by at the original position. The positions of the arms 26a and 28a and the heads 26b and 28b of the rock drilling device 23 and the spraying device 24 are controlled so as not to contact each other.
Also, various hydraulic cylinders 17 and 1 in the movable pier 9 are provided.
9. The control of the hydraulic jack 14a, the rock drilling device 23, the spraying device 24, and the like is centrally controlled by a central control panel (not shown). Also, the casting of the inverted concrete is performed using the formwork 8a shown in FIG.

Next, the operation of the mobile pier configured as described above will be described with reference to FIGS. In the tunnel 1, the rock drill 3 and the blowing robot 4 are used by the upper half face 2.
Excavation and concrete spraying work are performed, and the upper half 6 is excavated. On the other hand, the excavation of the lower half face 5 on the wellhead side by a predetermined distance from the upper half face 2
By the backhoe BH located at After that, the spraying device 24 and the rock drilling device 2 mounted on the mobile pier 9
By 3, concrete spraying work and rock bolt construction work are performed. Excavation and spraying operations for forming the invert 8 are performed during the excavation progress of the lower half 7. Excavation by the backhoe BH, the rock drilling device 23, and the spraying device 24, the concrete spraying, and the rock bolt construction work are performed one by one to equally divide the tunnel 1 in the width direction.

When the movable pier 9 is installed on the bottom 1b of the tunnel 1 on the left side as viewed from the wellhead, as shown in FIGS. Work is performed. The spraying device 24 moves to a predetermined position on the traveling rail 22 based on a control signal from the central control panel, and starts a concrete spraying operation. At this time, the rock drilling device 23 waits at the original position. The spraying operation is performed by spraying concrete onto the surface to be cut from the nozzle of the spraying head 28b while the position of the spraying head 28b is appropriately controlled through the arm 28a. When the concrete spraying operation is completed, the spraying device 24 returns to the original position. Next, the rock drilling device 23 moves to a predetermined position on the traveling rail 21 based on a control signal from the central control panel,
Start rock drilling work. At this time, the spray device 24 waits at the original position. For rock drilling, rock drilling head 26b is arm 2
The rock drilling is performed while appropriately controlling the position of the rock drill through the rock drilling head 26b to form a rock bolt insertion hole that penetrates the shotcrete and the ground. During the work in the lower left half, the backhoe BH located on the right bottom surface 1b of the upper half 6 performs a new work in the lower right half. The excavated earth and sand is loaded on a dump truck DT stopped on the mobile pier 9. When the concrete spraying and the construction of the rock bolt on the lower left half are completed, the movable pier 9 moves in the width direction of the tunnel 1 to the lower right half excavated by the backhoe BH, which is the next work position.

The movable pier 9 is moved in the width direction, that is, in the lateral direction of the tunnel 1 by driving and controlling the hydraulic jacks 14a and the hydraulic cylinders 17 to alternately move the gantry 10 and the bogie 11 alternately in the lateral direction. Done. Hereinafter, FIG.
The method of moving the mobile pier 9 in the lateral direction will be described. Prior to the lateral movement of the mobile pier 9, first of all, the elevator 18
Is raised by about 50 cm. FIG. 5A shows a state in which the hydraulic jack 14a is in an extended state and the movable pier 9 is supported by the outrigger 14. In this state, the wheels 16 are separated from the bottom surface 1b. From this state, FIG.
As shown in (b), the carriage 11 is slid in the lateral direction with respect to the gantry 10 by contracting the hydraulic cylinder 17. Next, as shown in FIG.
4a is contracted so that the wheels 16 of the carriage 11 are brought into contact with the bottom surface 1b, and the gantry 10 is separated from the bottom surface 1b.
From this state, as shown in FIG.
The gantry 10 is slid in the lateral direction with respect to the carriage 11 by extending the 7. In this way, the movable pier 9 is moved laterally by a distance corresponding to the stroke of the hydraulic cylinder 17. Then, the hydraulic jack 14a is extended again to the same state as that of FIG.
By repeatedly performing the operation (d), the movable pier 9 moves a predetermined distance in the lateral direction.

When the movable pier 9 has been moved laterally to the lower right half, which is the next work position, as shown in FIGS. 7A and 7B, first, only the spraying device 24 is moved forward. The concrete is sprayed on the lower right half of the newly excavated area. After the spraying device 24 retreats to the original position, only the rock drilling device 23 moves forward, and the rock bolt construction in the lower right half is performed. After the completion of the rock bolt construction, the rock drilling device 23 retreats to the original position. During the work in the lower right half,
The backhoe BH located on the left bottom surface 1b of the upper half 6 excavates the lower left half corresponding to the lower right half being worked.
The excavated earth and sand is loaded on a dump truck DT stopped on the mobile pier 9. When the concrete spraying and the rock bolt construction in the lower right half are completed, the movable pier 9 moves laterally to the lower left half newly excavated by the backhoe BH which is the next work position.

When the movable pier 9 has been laterally moved to the lower left half, which is the next work position, as shown in FIGS. 8 (a) and 8 (b), first, only the spraying device 24 is moved forward. The concrete is sprayed on the lower left half of the newly excavated area. After the spraying device 24 retreats to the original position, only the rock drilling device 23 moves forward, and the rock bolt construction is performed on the lower left half. After the completion of the rock bolt construction, the rock drilling device 23 retreats to the original position. When concrete spraying and rock bolt construction in the lower right half are completed, the invert 8
Is released from the mold 8a.

Next, as shown in FIGS. 9A and 9B,
The front of the removed formwork 8a is lifted by a rock drilling boom 26 via a rope. In addition, the hydraulic cylinders 19 are contracted to raise the front and rear elevating tables 18 from the bottom surface 1b by about 50 cm, and the hydraulic jacks 14a are contracted to raise the outriggers 14 so that the cart 11 is grounded. Then, the movable pier 9 is towed from the front by heavy equipment or the like to move the movable pier 9 forward by about 6 m. that time,
The form 8a suspended by the rock drilling boom 26 is moved forward together with the movable pier 9. After moving the movable pier 9 forward, the outrigger 14 is grounded, and the front and rear elevators 18 are lowered. Further, the mold 8a is set.

When the mold 8a is set, FIG.
As shown in (a) and (b), a chute S is connected from the Tramiki TM which stops on the movable pier 9 to each of the casting openings (not shown) of the formwork 8a located on the lower left and right. Then, invert concrete is distributed and poured from the tramiki TM into the formwork 8a via the chute S.

Thus, below the movable pier 9, after excavation of the lower half 7 by the backhoe BH, concrete spraying and rock bolting are performed by the spraying device 24 and the rock drilling device 23 mounted on the movable pier 9. Will be Then, when the invert construction is performed as in the present embodiment, concrete is sprayed below the movable pier 9 and invert concrete is cast on the construction surface of the rock bolt.

As described in detail above, according to the mobile pier 9 of this embodiment, the spraying device 2 mounted on the mobile pier 9
The concrete blasting and rock bolting of the lower half part 7 were performed by the rock drilling device 4 and the rock drilling device 23, and at the same time, the preparatory work before casting the inverted concrete was also performed. Therefore, excavation, concrete spraying, and rock bolt construction performed only for forming the invert 8 can be omitted. Conventionally, a rock drill and a spraying robot used at a face 50 m or more away from the invert work position for preparatory work for forming the invert 8 were used, so that each work on the face 2 and 5 was hindered. . But,
According to this embodiment, even when the invert construction is performed, each operation in the face 2 and 5 is not hindered. As a result, the construction period of the tunnel construction can be shortened. In addition, the mobile pier 9 can be used for concrete blasting and rock bolting of the lower half 7 even when the invert construction is not performed, and is used as a traffic bridge for vehicles transporting excavated shear in the upper half. be able to.

It should be noted that the present invention is not limited to the above-described embodiment, and may be configured as follows without departing from the spirit of the invention. (1) In the above embodiment, the mobile pier was applied to the bench cut method of NATM, and the lower half construction was performed by the spraying device 24 and the rock drilling device 23 mounted on the mobile pier 9.
The mobile pier 9 may be used only for the invert construction, for example, by using the mobile pier 9 for NATM such as a microbench method or a full-section method. Furthermore, the construction method of tunnel 1 is NA
It is not limited to TM.

(2) In the above embodiment, the rock drilling device 23 and the spraying device 24 are provided with one boom 26 and 28, respectively. However, the number of booms provided in each device 23 and 24 is required. It may be set appropriately as needed.

(3) In the above embodiment, the rock pier 23 and the spraying device 24 are provided on the movable pier 9, but any one of the devices may be provided. (4) The present invention may be applied to a tunnel construction in which no invert construction is performed.

(5) In the above embodiment, the concrete blasting of the lower half 7 and the rock bolting work as a preliminary work for the inverting work. However, the construction of the lower half 7 is carried out by a rock drill and a spraying robot. May go. In this case, since the invert construction is performed by the rock drilling device 23 and the spraying device 24 mounted on the movable pier 9, each operation of the lower half 7 is not hindered.

[0040]

As described in detail above, according to the first to fourth aspects of the present invention, there is provided an excellent effect that the progress of excavation at the face portion does not stagnate when the invert construction is performed. Play. Further, according to the invention as set forth in claim 5, there is an excellent effect that the rock drilling work and the concrete spraying work involved in the invert construction can be omitted.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a mobile pier disposed in a tunnel in one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view of a tunnel in which a mobile pier is arranged.

5 (a) to 5 (d) are schematic front views showing procedures of a lateral moving method of the movable jetty.

6A and 6B show a construction procedure using a movable pier, wherein FIG. 6A is a plan view and FIG. 6B is a side view.

FIG. 7A is a plan view, and FIG. 7B is a side view.

8 (a) is a plan view and FIG. 8 (b) is a side view.

9A is a plan view, and FIG. 9B is a side view.

FIG. 10A is a plan view, and FIG. 10B is a side view.

FIG. 11 is a sectional view of a tunnel in which a conventional pier for tunnel construction is arranged.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tunnel, 2 ... Upper half face as a face, 5 ... Lower half face as a face, 6 ... Upper half as an upper half, 7 ... Lower half as a lower half, 8 ... Invert, 9 ... Mobile type Pier, 23
... rock drilling equipment, 24 ... spraying equipment.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masayuki Soma 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Shinji Masada 144, 14 Article, Masamasa-machi, Motosu-gun, Gifu Prefecture Gifu Industry Co., Ltd. (56) References JP-A-61-294097 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) E21D 11/10

Claims (5)

(57) [Claims] In a tunnel during excavation, in a tunnel construction pier bridged over a construction area with rock bolt construction performed on a pit side from a face so that vehicles and the like can pass in the longitudinal direction of the tunnel. A pier for tunnel construction, comprising a rock drilling device for rock drilling for rock bolt construction. 2. In a tunnel during excavation, a tunnel construction work is carried out on a construction area including a concrete spraying operation performed on a wellhead side from a face so that a vehicle or the like can pass in the longitudinal direction of the tunnel. A pier for tunnel construction, comprising a spraying device for spraying concrete onto an excavated surface of a tunnel. 3. In a tunnel being excavated, a construction area involving rock bolt construction and concrete spraying work performed on the wellhead side from the face is bridged with the construction area so that vehicles and the like can pass in the longitudinal direction of the tunnel. A pier for tunnel construction, comprising: a rock drilling device for rock drilling to perform rock bolt construction; and a spraying device for spraying concrete onto an excavated surface of the tunnel. 4. An inverting method which is carried out by placing invert concrete on a wall surface of a tunnel excavated at a wellhead side from a face, and a tunnel pier is erected in a construction area of the invert. A rock drilling device and a spraying device are provided on a pier for tunnel construction that is built over the construction area, and rock drilling for rock bolt construction in the construction area for invert construction is performed by the rock drilling apparatus, and the rock excavation surface of the tunnel is An inverting construction method in which concrete is sprayed by the spraying device. 5. A tunneling method in which excavation of a tunnel is divided into an upper half and a lower half, and an upper half face is located forward of a lower half face in a tunnel excavation progress direction. A pier for tunnel construction with a spraying device is bridged between the upper half and the lower half, and rock drilling for rock bolt construction on the lower half after excavation is performed by the rock drilling device, and excavation of the lower half is performed. A tunnel construction method, wherein concrete is sprayed on a surface by the spraying device.