JPH1181893A - Concrete spraying device, and spraying method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fall of a top end generated before construction of a timbering on the back of a tail at the time of boring defective natural ground by a TBM (tunnel boring machine). SOLUTION: A concrete spraying device S is composed of a concrete spraying nozzle 10, a forward-back moving means and rotation means for the nozzle 10, and a material supply means to introduce concrete material to the nozzle 10. The spraying device S is mounted on a slit part 53 of a front chamber of a TBM (a chamber inside a cutter head), and temporary spraying of a face top end at a front part of the front chamber (chamber inside the cutter head) is performed at a proper time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for spraying concrete for use in tunnel construction and the like, and more particularly, to a failure in a tunnel boring machine (hereinafter referred to as a TBM) which is an excavator for a rock tunnel. When excavating a natural ground, the TBM is used to prevent collapse of the ground.
Front chamber (chamber in cutter head)
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying device and a spraying method suitable for temporarily spraying concrete on a top face of a front face.

[0002]

2. Description of the Related Art In recent years, from the viewpoints of ensuring safety, labor saving, high-speed construction, and improving economic efficiency, a construction method using a tunnel boring machine (TBM) as a rock tunnel excavation method, that is, a so-called TBM method, is frequently used. Have been.
This TBM has a main body composed of a cutter head, a cutter head support, a main beam, a gripper, a thrust jack, etc., and a rear bogie equipped with an operator room, a hydraulic unit, a control panel, a power transformer, etc. behind the main body. However, it travels on a rail provided in a tunnel shaft by being pulled by the main body.

In the above-described TBM excavation method, a cutter head having a plurality of disk cutters mounted on the front face is rotated while being pressed against a face by a thrust jack, so that a concentric circle is drawn and the cutter path rolling on the face face is rotated. Crush rock and excavate. Excavation waste is discharged backward by a conveyor provided in the machine.

[0004] In the above-mentioned TBM propulsion method, a gripper is pressed against a side wall to take a propulsion reaction force, and the entire body is propelled by a thrust jack. When one thrust excavation of the thrust jack is completed,
The gripper is replaced, the next stroke is started, and the tunnel wall is supported with steel supports, rock bolts, shotcrete, etc. according to the conditions of the ground.

[0005]

By the way, the aforementioned T
When excavating a bad mountain site at BM, the TBM
When the ground excavated at the tail of the mountain is exposed, the top of the ground collapses. For this reason, concrete is being sprayed in a hurry, but if early spraying is not possible in terms of timing, the collapse of the top of the ground cannot be prevented, requiring a large amount of cost for restoration. There was a problem.

In order to solve such a problem, the present invention provides a detachable blower that can temporarily blow concrete at the front end of the front face of the front chamber (chamber in the cutter head) of the TBM. The purpose of the present invention is to provide an attaching device and a spraying method thereof.

[0007]

In order to achieve the above object, the present invention provides a concrete spraying apparatus as follows. First, a spray nozzle for temporarily blowing concrete toward a top face of a face in front of a front chamber (chamber in a cutter head) in the TBM, nozzle moving means for moving the spray nozzle back and forth, and the spray nozzle Nozzle rotating means for rotating,
A concrete spraying device is constituted by a material supply means for introducing a concrete material, compressed air, and quick-setting agent into the spraying nozzle, and the concrete spraying device is installed in a slit portion of the front chamber (chamber in the cutter head). It was equipped.

Preferably, the nozzle moving means comprises a guide member made of a shaped steel, and a roller unit for moving the shaft provided with the spray nozzle back and forth by using the guide member as a guide. The roller unit is manually operated, but may be driven by a motor or a cylinder mechanism.

It is preferable that the nozzle rotating means is constituted by disposing a manual operation handle or an operation lever on the shaft. However, the present invention is not limited to this configuration, and a rotating mechanism such as a motor may be provided on the shaft.

Next, using the concrete spraying apparatus having the above-described structure, the concrete is temporarily blown to the top end of the face in front of the front chamber (chamber in the cutter head) by a spraying method including the following steps. Is performed. [1] After excavating a predetermined length by TBM,
Retreating the BM by the predetermined length. [2] The concrete spraying device having the above-described configuration is mounted on a slit portion of the front chamber (chamber in the cutter head) of the TBM, and the spray nozzle of the concrete spraying device is connected to the front chamber (chamber in the cutter head). The process of setting toward the top of the front face. [3] While the position of the spraying nozzle is adjusted by the nozzle moving means and the nozzle rotating means of the concrete spraying apparatus, material is supplied to the spraying nozzle by the material supplying means of the concrete spraying apparatus. A step of temporarily blowing the concrete with the spray nozzle toward the top end of the face in front of the front chamber (chamber in the cutter head). [4] Step of returning to [1] and repeating.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 is an overall perspective view showing an example of a concrete spraying device according to the present invention, and FIG.
It is explanatory drawing which shows the state which mounts the concrete spraying apparatus by this invention in the slit part of the front chamber (chamber in a cutter head) in TBM, and is performing temporary blowing of the top face of the front face of the said front chamber.

1 and 2, the general construction of a concrete spraying device according to the present invention will be described. The concrete spraying apparatus S according to the present invention comprises a blowable concrete spray nozzle 10, a guide member 11 made of opposed channel steel, and the spray nozzle 10 at the front end using the guide member 11 as a guide. Operation handle 12 at the rear end
It consists of two bearing units 16 connected by a plate 15 and attached to a running roller 14 by means of a bearing for moving the round shaft 13 equipped with (for manual movement and rotation of the round shaft 13 by hand) back and forth. Moving block A
And a pressure pump device (not shown) for introducing concrete material, air, and quick-setting agent to the spray nozzle 10 via a concrete material hose 17, an air hose 18, and a quick-setting agent hose 19. ing. The pumping pump device (not shown), together with the hoses described above,
It was provided in the chamber of the BM 50 or on a trailing carriage (not shown). 20 is the guide member 11
Is a mounting member for fixing to the mounting table 21 installed in the slit 53 of the front chamber 51 (chamber in the cutter head 52) of the TBM 50 with the holding bolt 22. Of course, the guide member 11
And the mounting member 20 are fixed in advance by bolts or the like. Further, 23 is the spray nozzle 10 having an outlet 24 set vertically upward at the front end of the round shaft 13.
It is a connection fitting for mounting. In this concrete spraying device S, the forward and backward movement and rotation of the spraying nozzle 10 are manually performed using the operation handle 12, but a motor and a cylinder mechanism are provided on the round shaft 13. It is also possible to provide a configuration that is provided and performed automatically.

Next, referring to FIGS. 1 and 2, a procedure for temporarily blowing concrete to the top of the face in front of the front chamber (chamber in the cutter head) using the above-described concrete spraying apparatus according to the present invention will be described. explain. <1> After excavating a predetermined length at the TBM 50,
The BM 50 is retracted by the predetermined length. <2> In the slit 53 of the front chamber 51 (chamber in the cutter head 52) in the TBM 50,
The above-described concrete spraying device S according to the present invention is mounted, and the spraying nozzle 10 of the concrete spraying device S is installed.
Is set toward the face end 54 at the front of the front chamber 51 (chamber in the cutter head 52). <3> Operating handle 1 of concrete spraying device S
While adjusting the position of the spray nozzle 10 in 2, the concrete material hose 17, the air hose 18, and the quick-setting agent hose 1 in the concrete spraying device S.
9, concrete material, air, and quick-setting agent are supplied to the spray nozzle 10 by the pumping pump device in the spray device S, and the spray nozzle 10 is placed in front of the front chamber 51 (the chamber in the cutter head 52). The temporary blowing of the concrete is performed toward the top face 54 of the part. <4> Return to <1> and repeat.

The temporary spraying operation of the concrete onto the face top 54 by the concrete spraying device S is as follows.
Since it is impossible with visual observation, the worker H performing the temporary blowing operation uses the operating handle 12 while managing the forward and backward movement range and the rotation (right and left swing angle) range of the spray nozzle 10. I did it. (In the case of the above-described forward and backward movement, the operation handle 12 is moved back and forth, and in the case of rotation, the operation handle 12 is rotated right and left.)

[0015]

In the embodiment where the concrete spraying apparatus S according to the present invention is used, the range in which the position of the spraying nozzle 10 can be adjusted is determined by the forward and backward movement 120.
The rotation range (left and right swing angles) was 120 °.
The excavation length of the above-mentioned TBM 50 is 500 mm.

[0016]

According to the concrete spraying apparatus and the spraying method according to the present invention described above, it is possible to timely spray concrete on the top of the face while excavating the collapsed ground, thereby improving safety. Needless to say, construction costs could be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an example of a concrete spraying device according to the present invention.

FIG. 2 is an explanatory view showing a state in which a concrete spraying device according to the present invention is mounted on a slit portion of a front chamber (a chamber in a cutter head) of a TBM, and temporary blowing of a top face of a front face of the front chamber is performed. It is.

[Explanation of symbols]

 10 ··· Spray nozzle 11 ··· Guide member 12 ··· Operation handle 13 ··· Round shaft 14 ··· Running roller 15 ··· Plate 16 ··· Bearing Unit 17 ··· Hose for concrete material 18 ··· Hose for air 19 ··· Hose for quick setting agent 20 ··· Mounting member 21 ··· Placement table 22 ··· Pressing bolt 23 ···· Connection metal 24 ··· Outlet 50 ··· TBM (tunnel boring machine) 51 ··· Front chamber 52 ··· Cutter head 53 ··· Slit 54 ··· Face Top end 55 ··· Cutter 56 ··· Thrust jack 57 ··· Conveyor for excavating shear discharge 58 ··· Cutter head motor A ··· Moving block C ··· Face H・Business members S ···· concrete spraying equipment

Claims (2)

[Claims] 1. A blowing nozzle for temporarily blowing concrete toward a top face of a front face of the front chamber in a slit portion of a front chamber in a tunnel boring machine, and a nozzle moving means for moving the blowing nozzle back and forth. And a spray device comprising nozzle rotating means for rotating the spray nozzle, and material supply means for introducing concrete material, compressed air, and quick-setting agent to the spray nozzle. Concrete spraying equipment. 2. A method for spraying a concrete spraying device, comprising the following first to fourth steps. (1) A first step of retreating the tunnel boring machine by the predetermined length after excavating the tunnel boring machine by a predetermined length. (2) The concrete spraying device according to claim 1 is mounted on a slit portion of a front chamber of the tunnel boring machine, and a spray nozzle of the concrete spraying device is directed toward a top face of a front face of the front chamber. The second step of setting. (3) While adjusting the position of the spraying nozzle by the nozzle moving means and the nozzle rotating means of the concrete spraying apparatus, the material is supplied to the spraying nozzle by the material supplying means of the concrete spraying apparatus; A third step of temporarily blowing the concrete toward the front face of the front face of the front chamber with the spray nozzle. (4) Returning to the first step and repeating the fourth step.