JP3409690B2 - Man cage - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mancage provided with a device for preventing a face from falling into the ground when a tunnel is excavated. 2. Description of the Related Art In a so-called mountain tunnel in which a tunnel is excavated and formed in a stable ground such as a bedrock from soft rock to hard rock, the face of the open tunnel is blasted using explosives. It is common to break down by work, or to excavate the tunnel by rock drilling and split rock work using various types of heavy equipment for tunnel excavation, especially when constructing a tunnel with a large cross section. 2. Description of the Related Art As a heavy machine for efficiently performing a digging operation, for example, a heavy machine for tunnel digging called a jumbo is conventionally known. [0003] According to this jumbo, an operator loads explosives into a large number of charging holes formed in the face by a drilling boom provided in the main body, and blasts the face to blast the tunnel. Excavation is carried out, and workers are placed on a man cage provided at the end of the jumbo boom and moved to a high place, so that workers can load explosives on the upper face and install the tunnel support at the top. Will be constructed. [0004] In such an operation of loading explosives in the vicinity of the face and at the time of installing a tunnel support,
The face is not protected by spraying mortar, etc., and the face is exposed.Therefore, rocks and earth and sand may fall down due to the collapse of the face, especially at the top of the face. Collapse can cause major obstacles to work. Therefore, as a method of preventing the collapse, conventionally, for example, a man cage provided at the tip of an arm provided on the tunnel excavating jumbo, a holding iron plate attached to a boom tip of a heavy machine such as an aerial work vehicle, etc. Has been used to press against the face immediately above the explosive loading work or the support installation work, and to prevent the face from collapsing by pressing. However, there are the following problems in applying the above-described method for preventing collapse of the face to the actual tunnel excavation site. First, in the case where the face is pressed by the mancage to prevent its collapse, the pressing area of the mancage against the face is limited to an area of only about 1 to 2 m in length and width of the front of the mancage. There has been a problem that the collapse of the face cannot be sufficiently prevented only by such a pressing area. Further, while the actual face face has a complicated uneven shape, the front face of the man cage and the holding iron plate are flat, so that the man cage, the holding iron plate and the like are used as the face face. It is difficult to bring them into close contact and press evenly, and there is a problem that a gap is formed between the face face and the man cage or the holding iron plate, and rocks and earth and sand fall and fall easily from the gap. [0009] Furthermore, it is conceivable to use a dedicated heavy machine which has a wide pressing area and presses the face face, but two heavy machines work together with this heavy machine and a heavy machine for tunnel excavation. Therefore, it is necessary to replace large heavy equipments in accordance with the work content, and there is a problem that heavy equipments are congested in a narrow tunnel, resulting in a decrease in work efficiency. The present invention solves the above problems, and can cover a wide range of the face.
It is an object of the present invention to provide a man cage provided in a heavy equipment for tunnel excavation that can easily and effectively prevent falling of rocks and earth and sand from an upper part of a face face by easily bringing a face and a pressing face into close contact with each other. It is the purpose. SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and has as its gist a telescopic boom provided in a heavy tunnel excavation machine used for excavating a mountain tunnel. A main airbag mounted on the front surface of the mancage, and a sub airbag mounted on the side surface of the mancage. An airbag, wherein the sub-airbag is deployed and arranged on the face by an expansion / contraction device via a reaction force plate rotatable around a front end of the mancage,
A man cage is characterized in that the face face can be pressed together with the main airbag. Here, the main air bag and the sub air bag which are mounted on the front part or the side part of the man cage are made of an inflatable flexible bag.
Each air bag is inflated by pumping a fluid such as air from a pressure device such as a compressor, while a fluid such as air inside the air bag is reduced by a decompression device such as a pump connected to each air bag. Is released to the outside and contracted. Further, it is not always necessary to press the face with the mancage in a state where an operator is arranged. According to the mancage of the present invention,
The boom of the heavy equipment for excavation provided with the man cage is extended so that the man cage is arranged at an appropriate position close to the face, and the face is pressed by the main air bag attached to the front of the man cage, By expanding the sub airbag attached to the side of the mancage as if the wings were spread via the reaction force plate by extending the expansion device, by pressing the face in parallel with the main airbag. In addition, the face can be pressed and protected over a wide range. The main airbag and the sub airbag, which are arranged opposite to the face, are inflated by being filled with a fluid by a pressure device, and have flexibility so that the face has various uneven shapes. Since it is in close contact with the surface and presses and supports it evenly, it is possible to reliably prevent rocks and earth and sand from collapsing from the face. That is, in the man cage of the present invention, the upper face, particularly the upper face, can be easily pressed and supported over a wide range by the main air bag and the sub air bag, and both air bags are easily brought into close contact with the face. As a result, it is possible to reliably prevent the face from being collapsed. In addition, the two air bags are mounted on the front and side surfaces of the mancage at the end of the boom of the tunnel excavating heavy equipment, and therefore, it is necessary to use heavy equipment other than the tunnel excavating heavy equipment to prevent the face from collapsing. Therefore, it is possible to avoid a decrease in work efficiency due to heavy equipment being congested in a narrow tunnel. Further, since the air bag is generally light in weight, has a small volume in a contracted state, and is easy to handle, the air bag is attached to or removed from the reaction plate at the end of the boom. Can be easily performed. The air bag described here is not limited to one for simply discharging air (air) into the inside thereof, but is applicable to any fluid including gas and oil. As the pressure device for inflating and contracting the air bag, not only a compressor and a pump but also various mechanisms can be adopted according to installation and construction conditions. Further, the reaction plate uniformly transmits the pressing force transmitted from the arm of the heavy excavating machine to the air bag. In addition, in the side air bag, the reaction plate expands and contracts when the side air bag is deployed and stored. Since the force from the device is transmitted evenly and is not particularly limited to the reaction force plate, the function may be assigned to, for example, a storage box for storing an airbag. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a jumbo 1 as a heavy equipment for tunnel excavation provided with the apparatus of the present invention. This jumbo 1 is a self-propelled vehicle body 2 having wheels and a drive engine.
And one or more drilling drifters 3 provided on the front surface of the vehicle body 2 as a drilling device for drilling a face.
And a rotor part 5 provided on the upper part of the vehicle body 2 and capable of rotating in the horizontal direction.
A man cage 6 is attached to the tip of the arm 4.
Is provided. The man cage 6 is mainly composed of the drilling drill 3
At the time of the explosive loading operation performed subsequent to the drilling operation on the face 13 by the operator, an operator is carried and the explosive is loaded by moving to the upper face that is normally inaccessible by humans and loading. This enables various operations to be performed near the roof of the tunnel when installing a support.
In addition, in this embodiment, in addition to these operations, the upper surface of the face 13 is pressed as described later to prevent the collapse. Incidentally, the movement of the man cage 6 to the above-mentioned work place can be quickly and freely performed by rotating the rotor unit 5 and performing horizontal movement thereof, and by appropriately adjusting the distance to the work position by the expansion and contraction operation of the arm 4. Done. The man cage 6 is surrounded by a protective handrail 7 in order to prevent the disposed workers from falling down. A storage box 8 is provided on the front and side surfaces of the man cage 6 via the protective handrail 7 (see FIG. 2), and the storage box 8 provided on the front of the man cage includes a main air bag 9 therein. On the other hand, the storage box 8 provided on the side of the mancage stores the sub airbag 10 therein. In the present embodiment, the storage box 8 provided on the side of the mancage also serves as a reaction force plate in the present invention. The main air bag 9 and the sub air bag 10 are stored in a contracted state inside the storage box 8 when they are not needed, and an air pipe connected to a pressure device is connected to the air bag. At the time of the operation, the air is inflated by forcing air into both air bags through the air pipe. The inflated main airbag 9 and sub airbag 10 protrude from the front surface of the storage box 8 and adhere closely along the concavo-convex shape of the facing face 13 and press evenly to prevent collapse. (Note that
In FIG. 1, the sub airbag 10 and its storage box are omitted. 2) (a) and (b) show the main air bag 9 and the sub air bag 10 and the process of activating them. In the figure, a main air bag 9 and a sub air bag 10 are
And a pressure pipe mechanism such as an air pipe and an air inlet / outlet at the back of the storage box 8, and a hydraulic jack 11 as a telescopic device in addition to the storage box. Connected to deploy and store. FIG. 2A shows that when the side airbag 10 is not required, the hydraulic jack 11 is in a contracted state, so that the storage box 8 and the side airbag 10 stored therein are also along the side surface of the man cage 6. The wings are stored as if folded. FIG. 2 (b) shows the storage box 8 housed in a folded state in FIG.
And the main airbag 9 at the front of the mancage 6 that presses the face 13 by the extension of the arm 4 provided on the vehicle body 2 of the jumbo 1, and the inside of the storage box 8. Sub airbag 10
The figure shows that the face 13 is pressed by disposing it near the face 13 and inflating it. On the other hand, when the main air bag 9 and the sub air bag 10 are stored again from the inflated state, the air in the air bags 9 and 10 is discharged to the atmosphere through the discharge ports by a pressure reducing device such as a pump. The inside of the airbags 9 and 10 is further made to have a negative pressure, and the airbags 9 and 10 are contracted flat by this decompression effect, and are housed in the storage box 8. Accordingly, the hydraulic jack 11 is also contracted, and the storage box 8 for storing the sub airbag 10 is stored on the side surface of the man cage 6 as if the open wings were folded. FIGS. 2 (a1) and (b1) correspond to FIG.
It is the figure which looked at the pressing area of the face 13 by the airbag in each state of (a) and (b) from the face of the face,
(A1) In the drawing, only the main airbag 9 is arranged opposite to the face face 13 and inflates to press the face face.
You can see that just one is not enough. On the other hand, (b1)
In the figure, it can be seen that in addition to the main airbag 9, the sub airbag 10 is arranged opposite to the face face 13 and inflated, and presses most of the upper part of the face face 13. Therefore, the man cage 6 including the main air bag 9 and the sub air bag 10 can press and protect most of the upper face face evenly, preventing rocks and earth and sand from falling down, It is possible to work efficiently without giving any obstacle to various works. Here, FIG. 1 shows the man cage 6 of this embodiment.
2 shows a series of operations for preventing the jumbo 1 provided with the collapsing operation on the face 13. First, after drilling the charging hole 13a by the drifter 3, an operator gets on the man cage 6 at the tip of the boom 4 at the standby position, elongates the boom 4 while raising it to a required angle, and furthermore, the rotor 5 Is rotated to adjust the horizontal position, and the man cage 6 is arranged close to the vicinity of the face 13. Next, by operating the hydraulic jack 11, the storage box 8 folded along the side surface of the mancage 6 is deployed so as to spread the wings, and is disposed together with the main airbag 9 so as to face the face 13. By operating a compressor or the like to apply air pressure to the main air bag 9 and the sub air bag 10, both air bags in the contracted state protrude from the storage box 8 and inflate.
The face 13 is in close contact with the uneven surface of the face 13 and is pressed without any gap to prevent collapse. After the face 13 has been prevented from collapsing by the above-described operations, operations near the face such as charging the charging holes 13a are performed. After the charging operation is completed, the air in the main air bag 9 and the sub air bag 10 is exhausted into the atmosphere by operating a pump as a decompression device, and the air bags 9 and 10 are further depressurized. It is contracted and stored in the storage box 8. Then, the user operates the hydraulic jack 11 to remove the storage box 8 containing the side airbag 10 from the man cage 6.
After that, the boom 4 and the rotor unit 5 are operated to return the man cage 6 to the standby position, and a series of operations is completed. In addition, not only in the blasting preparation work but also in various situations in which measures to prevent the face face 13 from collapsing are required, such as the work of installing and assembling the support material near the face by the operator, as described above, The present invention in which the main airbag 9 and the sub airbag 10 prevent the face 13 immediately above the working position from collapsing is effective. In the present embodiment, the air bag discharges air (air) into the interior, but is not limited to air (air). Applicable. Further, as the pressure device for inflating and contracting the air bag, not only a compressor and a pump, but also various other mechanisms can be adopted according to installation and construction conditions. In this embodiment, the storage box 8 for storing the airbag uniformly transmits the pressing force transmitted from the arm 4 and the force from the hydraulic jack 11 when the side airbag 10 is inflated and contracted to the airbag. Although it fulfills the function, it is not limited to the storage box 8, so that a reaction force plate or the like may be provided to perform the function. As described in detail above, the present invention
According to the mancage provided with the face-face fall prevention device, the face face can be pressed and protected over a wide range by arranging and inflating the main airbag and the sub airbag in parallel to the face face in parallel and inflating, In addition, the main airbag and sub airbag are filled with fluid and inflated, close contact with the face that shows various irregularities and press it evenly, so that the face is securely prevented from collapsing It is possible to improve the efficiency of the work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a jumbo for tunnel excavation to which a mancage according to the present invention is applied. FIGS. 2A and 2B are explanatory views showing an inflated state from a stored state of an airbag in the mancage of the present embodiment. (A1) corresponds to (a) and (b1) corresponds to (b).
FIG. 4 is an explanatory view showing a region where the tunnel face is pressed by an airbag in correspondence with FIG. [Description of Signs] 1 Jumbo (heavy machinery for tunnel excavation) 2 Car body 3 Drifter 4 Boom 5 Rotor part 6 Man cage 7 Protective handrail 8 Storage box 9 Main air bag 10 Sub air bag 11 Hydraulic jack 12 Tunnel ground 13 Cutting face 13a Medicine hole

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukinobu Yamamoto 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (56) References JP-A-10-220166 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21B 7/02 E21D 9/00

Claims (1)

(57) [Claims 1] An excavator is provided at the tip of a telescopic boom provided in a heavy tunnel excavation machine used for excavation of a mountain tunnel, and is disposed in close proximity to a face of the tunnel. In the mancage where the work is performed, a main airbag attached to a front part of the mancage, and a sub airbag attached to a side part of the mancage,
The sub airbag is deployed and arranged on the face surface by a telescopic device via a reaction force plate rotatable around the front end of the mancage, and can press the face surface together with the main airbag. A mancage characterized by being.