JP4447971B2 - Tunnel construction method and tunnel spraying machine therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tunnel construction method and a tunnel spraying machine for the tunnel construction method that can perform a spraying operation on a tunnel and a slipping operation after excavation in parallel.

  In mountain tunnel construction, there are bench cutting methods such as full-section excavation method, upper half-section advanced construction method, long bench cut, short bench cut, mini bench cut, etc. depending on the excavation method. In general, this is done by stepping through the steps of blasting excavation, loading and blasting, scouring, loading support construction, shotcrete construction, and rock bolting in sequence. The support construction, shotcrete construction, and rock bolt placement may be omitted or the order may be changed due to differences in ground conditions, tunnel construction methods, excavation methods, and the like.

  In conventional mountain tunnel construction, as described above, the drilling work, scraping work, and shotcrete work are performed in a series of processes, and these work processes must be performed in parallel. There was no.

  In recent years, rapid construction has been sought as a measure for cost reduction, but the most effective method that can shorten the work cycle time is to enable concurrent work safely and efficiently.

Therefore, in the following Patent Document 1, the applicant of the present invention is provided with a portal frame that is provided with a traveling device at the lower end portion of the leg and is capable of self-propelling, and an arm front end portion that is equipped at a front position in the traveling direction of the portal frame. A mobile spraying work platform comprising a spraying robot that holds a spraying nozzle, and through which the tunnel construction machine such as a slide loader and a mobile drilling jumbo can pass through the portal frame. A tunnel construction method was proposed in which mortar or concrete was sprayed by the spraying robot in parallel with the work by the loader.
JP 2000-226996 A

  However, in the case of the mobile spraying work platform described in the above-mentioned Patent Document 1, since the inside of the tunnel construction machine such as a slip loader and a mobile drilling jumbo can be passed, the scale of the apparatus increases. There was a problem of occupying a large space in the tunnel. In addition, although rapid construction is possible and the construction period is shortened, there are problems such as increased production costs and increased construction costs.

Therefore, the main problem of the present invention is that a tunnel construction method that allows mortar or concrete spraying work to be performed in parallel with the work with a sled loader, and a tunnel blower for the above tunnel construction method that requires low production costs. It is to propose the attached machinery.

In order to solve the above-mentioned problem, as an invention according to claim 1, a crawler-type or tire-type traveling base is provided with a telescopic boom with a maximum boom extension of at least 15 m, and at the tip of the boom, A tunnel construction method using a tunnel spraying machine holding a spray nozzle that is swiveled and swingable ,
Bring the tunnel spraying machine to one side of the tunnel passage, blast excavation work such as drilling and charging, and / or tunnel face with a movable drilling jumbo that passes through the side of the tunnel and moves to the front face of the tunnel face. While performing excavation work with the machine excavator moved to the front part, if necessary, perform work such as rock bolt drilling and setting with the movable drilling jumbo,
After the blast excavation, or during or after mechanical excavation, the tunnel spraying machine is moved to one side of the tunnel passage in front of the face and the mortar or concrete is sprayed while the side of the tunnel is in a state where the truck can pass. There is provided a tunnel construction method characterized in that, in parallel with the spraying work, the slipping loader performs the slipping work using the space under the boom of the tunnel spraying machine. .

  In the first aspect of the present invention, when the tunnel blowing machine is moved to one side of the tunnel passage in front of the face and the side portion is made in a state in which the truck can pass, the slip loading machine and the slip carry truck are In order to be able to freely go to and from the tunnel face, after the blast excavation, or at the time of machine excavation or after, the mortar or concrete is sprayed by the tunnel spraying machine. At the same time, using the space under the boom of the tunnel spraying machine, the slip loader can perform the slip operation.

According to a second aspect of the present invention , a spray material adhesion preventing cover material is provided on an upper surface of a boom of the tunnel spray machine, and the spray material adhesion preventing cover material has at least a tip that holds the spray nozzle. The tunnel construction method according to claim 1, wherein the tunnel construction method has a structure that can be expanded and contracted so as not to hinder the expansion and contraction operation of the side boom .

  According to a second aspect of the present invention, a cover material for preventing spraying material adhesion is provided on the upper surface of the boom. The spraying material adheres to the boom due to the rebounding of the spraying material, and if the boom is expanded and contracted in this state, there is a risk that the insertion of the boom will cause mortar or the like to bite and the boom can not be expanded or contracted. By providing the cover material for preventing material adhesion, the spray material is prevented from adhering to the boom. In this case, since the tip side boom of the boom is subjected to a blowing operation and needs to be expanded and contracted to position the spray nozzle, the spray material adhesion prevention cover material obstructs the extension and contraction operation of the tip side boom. A structure that can be expanded and contracted so that it does not occur.

  As a third aspect of the present invention, a crawler-type or tire-type traveling base is provided with a telescopic boom having a maximum boom extension of at least 15 m, and at the tip of the boom, it can be swung and swung freely. A spraying material adhesion preventing cover material is provided on the upper surface of the boom, and the spraying material adhesion preventing cover material performs at least a telescopic operation of the tip side boom holding the spraying nozzle. There is provided a tunnel spraying machine characterized by having a structure that can be expanded and contracted so as not to obstruct.

  According to the third aspect of the present invention, a traveling heavy machine with a boom is provided on a crawler-type or tire-type traveling base having a telescopic boom with a maximum boom extension of at least 15 m, that is, commercially available or leased. A spray nozzle that can turn and swing is held at the tip of the boom. Accordingly, the scale of the apparatus can be reduced, and it is only necessary to use a commercially available or leased crane and to manufacture only the blowing device attached as an attachment to the end of the boom. It becomes like this.

Further, by providing a cover material for preventing spraying material adhesion on the upper surface of the boom, as described above, the spraying material adheres to the boom due to the rebound of the spraying material, and the insertion part of the boom engages with mortar or the like. Can be prevented.

  As described above in detail, according to the present invention, it becomes possible to perform a mortar or concrete spraying operation in parallel with the operation of the loader, and to improve the efficiency of tunnel construction. In addition, the tunnel spraying machine used for this has a crawler-type or tire-type traveling base equipped with a telescopic boom with a maximum boom extension of at least 15 m, and a swivel and swing at the tip of the boom. Since the structure is configured to hold the spray nozzle that can be moved, the manufacturing cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Structure of tunnel spraying machine 1]
1 is a side view of a tunnel spraying machine 1 according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof.

  As shown in FIGS. 1 to 3, the tunnel spraying machine 1 includes a telescopic boom 3 having a boom maximum extension L of at least 15 m or more on a crawler type or tire type traveling base 2. The boom 3 has a structure in which a spray nozzle 6 that can be swung and swung is held at the tip of the boom 3.

  For the base and boom structure portion including the crawler-type or tire-type traveling base 2 and the telescopic boom 3 having a maximum boom extension / contraction length of at least 15 m or more, preferably 18 m or more, for example, a boom type aerial work It is possible to divert the vehicle base and the boom structure as they are.

  When the maximum extension L of the boom 3 is less than 15 m, the slip loader 12 performs the slip operation using the space under the boom of the tunnel spray machine 1 in parallel with the spray operation. Since it becomes difficult to secure a space, the spraying machine 1 having a boom length of at least 15 m is used.

  In the illustrated example, the boom 3 of the tunnel spraying machine 1 has a three-stage telescopic structure of a distal end side boom 3A, an intermediate boom 3B, and a proximal end side boom 3C, and the upper surfaces of the distal end side boom 3A and the intermediate boom 3B. A cover material 4 for preventing spray material adhesion (hereinafter simply referred to as a cover material) is provided. Since the distal end boom 3A is expanded and contracted to position the spray nozzle 6 during the spraying operation, the cover member 4 can be expanded and contracted so as not to obstruct the expansion and contraction operation of the distal end boom 3A. . That is, the front end side cover member 4A supported in a bracket shape along the front end side boom 3A is provided with the front end portion of the front end side boom 3A as a fixed end, and the intermediate boom with the front end portion of the intermediate boom 3B as a fixed end is provided. A base end side cover material 4B supported in a bracket shape along 3B is provided, and the front end side cover material 4A and the base end side cover material 4B are overlapped with each other in a vertical relationship, whereby the cover material 4 is This prevents the boom 3 from extending and contracting.

  On the other hand, as shown in detail in FIG. 4, the spraying device 5 supports the turning hydraulic motor 8 by a bracket 7 connected to the distal end side boom 3 </ b> A, and the rotating shaft of the turning hydraulic motor 8. The base end side of the spray nozzle 6 is pivotally supported by the tip of the portion 9 and the middle of the rotating shaft 9 and the base end portion of the spray nozzle 6 are supported by a swing hydraulic cylinder 10. It has a connected structure. Accordingly, the spray nozzle 6 can be swung in the tunnel circumferential direction by the rotation of the rotating shaft portion 9, and can be swung in the tunnel axis direction by the expansion / contraction operation of the rocking hydraulic cylinder 10.

[Tunnel construction procedure]
Hereinafter, the tunnel construction procedure using the tunnel spraying machine 1 will be described in detail with reference to FIG. In addition, since the example of illustration is an example of a mini bench construction method, suppose that it demonstrates according to the work procedure along the construction method.

(Lock bolt drilling and face drilling for charge etc.)
As shown in FIG. 5 (A), the tunnel spraying machine 1 is moved to one side of the tunnel passage, and is locked by the wheel-type drilling jumbo 11 that has passed through the side and moved to the front face of the tunnel face. Bolt drilling and placement, face drilling and charge.

  When the drilling of the face is completed and the charging is completed, as shown in FIG. 4 (B), the wheel-type drilling jumbo 11 is retracted backward to perform blasting.

  In addition, although the example by blast excavation was described in this example, the excavation work may be mechanical excavation using a free-section excavator. In this case, when it is necessary to place the lock bolt, the movable drilling jumbo 11 is used together to perform the lock bolt drilling and the lock bolt placement.

[Slip out work]
When the blasting work is completed (or during or after the machine excavation work), as shown in FIG. 5 (C), the tunnel blowing machine 1 is moved to one side of the tunnel passage in front of the face, and the side The tunnel spraying machine 1 performs a mortar or concrete spraying operation while the section is in a state in which the loader 12 and the truck 13 can pass, and the tunnel spraying machine concurrently with the spraying operation. The slip loader 12 performs the slip-out operation using the space under the boom 1. The tunnel spraying machine 1 promptly evacuates to the rear side of the tunnel after the spraying operation is completed.

1 is a side view of a tunnel spraying machine 1 according to the present invention. FIG. It is the front view. It is an enlarged side view of the spraying device 5. (A)-(C) are work procedure diagrams showing tunnel construction procedures.

  DESCRIPTION OF SYMBOLS 1 ... Tunnel spraying machine, 2 ... Traveling base, 3 ... Boom, 3A ... Tip side boom, 3B ... Intermediate boom, 3C ... Base end side boom, 4 ... Cover material, 4A ... Tip side cover material, 4B ... Base end side cover material, 5 ... Spraying device, 6 ... Spraying nozzle, 11 ... Wheel type drilling jumbo, 12 ... Sliding loader

Claims (3)

Tunnel with crawler-type or tire-type travel base equipped with a telescopic boom with a maximum boom extension of at least 15 m and a spray nozzle that is pivotable and swingable at the tip of the boom A tunnel construction method using a spray machine ,
Bring the tunnel spraying machine to one side of the tunnel passage, blast excavation work such as drilling and charging, and / or tunnel face with a movable drilling jumbo that passes through the side of the tunnel and moves to the front face of the tunnel face. While performing excavation work with the machine excavator moved to the front part, if necessary, perform work such as rock bolt drilling and setting with the movable drilling jumbo,
After the blast excavation, or during or after mechanical excavation, the tunnel spraying machine is moved to one side of the tunnel passage in front of the face and the mortar or concrete is sprayed while the side of the tunnel is in a state where the truck can pass. A tunnel construction method characterized in that, while performing the work, the slip loader performs the slip work by utilizing the space under the boom of the tunnel spray machine in parallel with the spray work. A cover material for preventing spraying material adhesion is provided on the upper surface of the boom of the tunnel spraying machine, and the cover material for preventing spraying material adhesion does not hinder expansion / contraction operation of at least the front end side boom that holds the spraying nozzle. The tunnel construction method according to claim 1, wherein the tunnel construction method has a structure that can be expanded and contracted.   A crawler-type or tire-type traveling base is provided with a telescopic boom whose maximum boom extension is at least 15 m, and a spray nozzle that can be swung and swung is held at the tip of the boom, A cover material for preventing spraying material adhesion is provided on the upper surface of the boom, and the cover material for preventing spraying material adhesion has a structure that can be expanded and contracted so as not to hinder the expansion and contraction operation of at least the tip side boom that holds the spraying nozzle. A tunnel spraying machine characterized by

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