JPH0512399Y2 - - Google Patents

Description

[Scope of Claims] A centrifugal projection type spraying machine main body 2 comprising a hopper 5, a screw tube 6 communicating with the hopper, and a projection head 7 for projecting the material sent by the screw tube 6 in a radial direction. In a tunnel spraying machine mounted on a movable base 1, a slide base 3 is provided on the base 1 and is movable back and forth in the direction of the tunnel axis, and a support shaft supported by a bearing 14 on the slide base 3. At the same time, the upper part of the support shaft 13 is fixed to the table 15 connected to the centrifugal projection type spraying machine main body 2, and the sprocket 17 is fixed to the lower part of the support shaft 13.
There are two turning cylinders 1 each having a chain 18 that engages with a sprocket 17 connected to the tip of the piston.
9a, 19b are built in, and the turning cylinder 19 is installed in the piping of the turning cylinders 19a, 19b.
A tunnel spraying machine characterized by interposing a switching valve 20 for operating the a and 19b in opposite directions. [Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tunnel spraying machine. [Prior Art] In tunnel construction, it is common to spray concrete or mortar onto the inner surface of the tunnel as the excavation progresses. Conventionally, this tunnel spraying method generally involves disposing a spraying machine using compressed air as a conveying medium at a remote location.
The method used was to lead a pneumatic hose from a spraying machine to the site, have a nozzle man guide the pneumatic hose to the site, and then have the nozzle man spray materials from a spray nozzle at the end of the pneumatic hose. [0003] However, this method poses a safety problem because a large amount of dust is exposed during the work, and the work cost is also high because it requires a large number of workers. [0004] As a countermeasure to this problem, the present inventor proposed a new spraying device that uses a projection blade and a screw cylinder to project the material using centrifugal force and apply it to the construction surface. However, since this spraying device simply rotated the projection blade around the tunnel axis, it sprayed even the bottom of the tunnel that did not require spraying, but was unable to spray the tip of the face.
In addition, it is not possible to spray the boundary area between the tip of the face and the cylindrical hollow part, and in particular, the face part is still excavated and the rock is extremely uneven, so it is necessary to spray thoroughly in the necessary area. There was a problem that I couldn't do it. [Problems to be solved by the invention] The present invention was devised to solve the above-mentioned problems, and its purpose is to reduce the cylindrical shape of the tunnel by a simple structure. The object is to be able to thoroughly spray not only the surface, but also the tip surface of the face, which is the cutting edge of excavation, and the boundary area between the tip surface of the face and the cylindrical surface. [0006] In order to achieve the above object, the present invention provides a centrifugal projection type spraying machine body equipped with a hopper, a screw cylinder communicating with the hopper, and a projection head that projects the material sent by the screw cylinder in a radial direction. In a tunnel spraying machine of the type that is mounted on a base that can freely travel, a slide base that can move forward and backward in the tunnel axis direction is provided on the base, a support shaft supported by a bearing is provided on the slide base, and The upper part of the spindle is fixed to a table connected to the centrifugal spraying machine body, the sprocket is fixed to the lower part of the spindle, and the chain that engages with the sprocket is connected to the tip of the piston on the slide base. Two swing cylinders are built in, and switching valves for operating the swing cylinders in opposite directions are interposed in the piping of the swing cylinders. [Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings. 1 to 8 show an embodiment in which the tunnel spraying machine according to the present invention is applied to a rail mount type. 1 is a base, and in this embodiment, wheels 8, 8 are used to make tunnels. It is now possible to run on rails laid inside. Alternatively, a tire mount or crawler system may be used. [0008] Reference numeral 2 denotes a spraying machine main body, which is supported on a slide base 3 placed on the base 1. 4
a and 4b are belt conveyors installed on the base behind the spraying machine main body 2, and convey cement,
Material A for spraying, such as sand and gravel, is fed to the spraying machine main body 2. The belt conveyor 4b at the front stage is movable in response to the sliding of the spraying machine main body 2, which will be described later. [0009] The spraying machine main body 2 has a hopper 5 that receives the material A from the belt conveyors 4a and 4b.
, a screw tube 6 communicating with the lower opening of the hopper 5, and a projection head 7 rotatably mounted on the front part of the screw tube 6. It is configured to move forward and backward on the base 1, and the slide base 3
It can be rotated horizontally at the top. The slide mechanism has female screw members 9, 9 fixed to the slide base 3, screw members 9, 9 fixed to the base 1, and a screw shaft 10 through which the female screw members 9, 9 are screwed through the base 1. 10 and a motor 11 for driving the screw shafts 10, 10 are provided, and furthermore, guide rollers 12a, 12b which are in contact with the bottom and side surfaces of the slide base 3 are arranged inside and on the upper side of the base 1. Of course, a push/pull mechanism using a cylinder may be used instead of this mechanism. Next, as shown in Figure 4, the rotating mechanism
For example, a support shaft 13 supported by a bearing 14 is provided in a slide base corresponding to the hopper position, and the upper part of this support shaft 13 is fixed to a table 15 connected to the main body 2 of the spraying machine by a frame 16. There is. Furthermore, a sprocket 1 is installed at the bottom of the support shaft 13.
7 is fitted and fixed on the outside, and the slide base 3 is also provided with a rotating cylinder 19a, 1, which has a chain 18 that engages with the sprocket 17 connected to the tip of the piston.
9b is provided. Then, by interposing a switching valve 20 such as an electromagnetic type in the piping of the swing cylinders 19a, 19b, and converting the port of the switching valve 20 by remote control, the swing cylinders 19a, 1
9b in opposite directions, and sprocket 17.
He is trying to rotate the support shaft 13 clockwise and counterclockwise via. If necessary, a moving member 21 such as a roller, which contacts the lower surface of the table 15, is arranged on a slide base corresponding to the other part of the spraying machine main body 2. [0010] The screw cylinder 6 is supported by a bearing 22 supported on the table 15, and a feed screw 23 is inserted in the axial direction, and the feed screw 23 is connected to the rear sprocket 24 as required. It is designed to rotate at a high speed. The feed screw 23 has a stirring blade 25 in a part thereof, and is configured to simultaneously stir and mix the material A while feeding it to the projection head 7. The feed screw 23 is configured as a hollow shaft, and an admixture such as water or a quick-setting agent is fed into the screw cylinder through a hose 26 connected to the rear end and a pump 27 on the base. , nozzle hole 28
I try to spray it into the material from the source. [0011] The projection head 7 includes an end plate 30 located in front of the screw tube 6, a donut-shaped disk 31 that is externally fitted onto the screw tube 6 so as to face the end plate 30, and an end plate 31 located in front of the screw tube 6. It is equipped with a partition plate 32 that connects the plates 30 to form a radially open pocket, and an outer cylinder 33 whose one end is connected to the disc 31 and loosely fitted around the outer periphery of the screw cylinder 6. The cylinder 33 is rotatably supported by a bearing 34 fixed to the table 15, and is driven by a motor 36 via a V-pulley 35 fixed to the outer periphery. [0012] A shaft 37 with stirring blades is provided on the end plate 30 coaxially with the feed screw 23, and a discharge port 38 of a required size is cut out on the peripheral surface of the tip of the screw cylinder 6, and the stirring The projected material is sent to the rotating pocket 39 only from the area of the discharge port 38, rather than all around, so that the projection range (projection angle) is regulated. [0013] In order to change the discharge port position according to the spraying location, a sprocket 40 is fixed to the screw tube 6, and the screw tube 6 is controlled by an adjustment motor 41 and a chain as shown in FIG. can be rotated to any rotation angle. If necessary, a diagonal guide 42 is attached to the outer periphery of the disc of the projection head 7 for regulating the projection range in the direction perpendicular to the axial direction. [0014] In other drawings, 43 is a tunnel cylindrical surface, 44 is a face surface, 45, 45 are left and right corner portions of the face surface, and 46, 46 are upper and lower corner portions. [Operation of the embodiment] Next, the operating situation and operation of the present invention will be explained. When spraying tunnels, the tunnel is run on rails laid in the tunnel as shown in FIG. 1, and at this time the slide base 3 is moved backward as shown. When the construction site is reached, the material A such as cement, sand, gravel, etc. is continuously supplied to the hopper 5 of the spraying machine main body 2 by the belt conveyors 4a and 4b, and the feed screw 23 is , motor 3
6 rotates the projection heads 7, respectively, and supplies liquid such as water or an admixture from the shaft end of the feed screw 23. [0016] As a result, the material A introduced into the hopper 5 is forwarded by the feed screw 23 inserted in the screw cylinder 6 and is supplied with the liquid, and is further fed by the stirring blade of the feed screw 23. 25 and a shaft 37 with stirring blades extending from the projection head 7, and in this state, the mixture reaches the end plate region facing the end of the screw tube 6, and is separated from the discharge port 38 opened in the screw tube 6. It flows into each pocket 39 between the plates 32, 32 and is attached to the tunnel cylindrical surface 43 by centrifugal force due to rotation. [0017] At this time, the discharge port 38 is not the entire circumference of the screw cylinder 6, but a part of it (for example, 1/6 of the entire circumference).
Since the projection range is restricted, and the position of the discharge port 38 in the circumferential direction can be freely changed by rotating the screw cylinder 6 by the adjustment motor 41, the projection range is restricted. No spraying is performed, and spraying can be performed accurately only at the corners in the vertical direction. [0018] However, with such spraying, although the tunnel cylindrical surface 43 can be sprayed, the face surface 44 cannot be sprayed. However, in this invention,
The spraying machine main body 2 is slidable in the direction of the tunnel axis and can also be rotated around a vertical axis at any sliding position, so that the face surface can be sprayed smoothly. [0019] That is, when the motor 11 is driven, the screw shafts 10, 10 rotate, and the screw shafts 10, 10 rotate.
Due to this rotation, the slide base 3 moves relative to the base 1 via the female screw members 9, 9, and the spraying machine main body 2 installed on the slide base 3 moves together. On the other hand, if the port of the switching valve 20 is switched from the neutral position to the forward or reverse direction, the pistons of the swing cylinders 19a and 19b mutually operate in reverse, thereby causing the chain 18 to move clockwise or counterclockwise. Being pulled. As a result, the support shaft 13 rotates, so the spraying machine main body 2 pivots around the support shaft 13 via the table 15 to which the support shaft 13 is fixed, and the projection head 7 is rotated accordingly. From the state directly facing the a face surface 44 in Fig. 7, b, c
It changes like this. [0020] Therefore, if the state shown in Fig. 7a is fixed and the spraying machine main body 2 is moved in the axial direction, spraying can be automatically performed along the tunnel cylindrical surface 43, and the tunnel At the stage when the spraying of the shaped surface 43 is completed, the rotating cylinder 19a,
19b, the projection head 7 will move as shown in Fig. 7a.
The state gradually changes from the state to the state inclined in the plane as shown in b, and due to this operation, material A is on the face surface 4
4 from the center area to the end areas, and when the projection head 7 finally reaches a position substantially orthogonal to the tunnel axis as shown in FIG. 7c, the left and right corners 45 of the face 44, 45 is effectively sprayed. Excavated convex portion 43 on tunnel cylindrical surface 43
Since the projection head 7 can freely rotate even if there is a zero, it is possible to avoid this and spray the corner portion 45. [0021] Furthermore, the present invention makes good use of the slide base 3 for axial movement, and connects the sprocket 17 fixed to the support shaft 13 with the pistons of the two cylinders 19a and 19b built into the slide base 3 through the chain 18. and cylinders 19a, 19
b is operated in the opposite direction by the switching valve 20 to obtain the turning movement, so a reliable turning movement can be achieved with a simple and inexpensive mechanism, and the thickness of the slide base 3 can be reduced. It can be done. Therefore, the present invention is suitable for spraying for tunnel construction. [0022] [Effect of the invention] According to the invention described above, a centrifugal device comprising a hopper 5, a screw tube 6 communicating with the hopper, and a projection head 7 that projects the material sent by the screw tube 6 in the radial direction. In a tunnel spraying machine in which a projection type spraying machine main body 2 is mounted on a movable base 1, a slide base 3 that can freely move forward and backward in the direction of the tunnel axis is provided on the base 1.
A support shaft 13 supported by a bearing 14 is provided on the slide base 3, and the upper part of the support shaft 13 is fixed to a table 15 connected to the centrifugal projection type spraying machine main body 2. A sprocket 17 is fixed to the lower part of the body 13, and a chain 1 that engages with the sprocket 17 is attached to the slide base 3.
Two turning cylinders 19a and 19b are built in, and the turning cylinder 1 is connected to the tip of the piston.
Since the switching valve 20 for operating the valves 9a and 19b in opposite directions is interposed, the tunnel cylindrical surface 43
When the spraying is completed and the face area is reached, simply by switching the switching valve 20 from the neutral position by remote control, one of the pistons of the swing cylinders 19a, 19b will extend and the other will shorten. 18 and the sprocket 17, the support shaft 13 and the table 15 connected thereto are rotated clockwise or counterclockwise at an arbitrary rotation angle, and the projection head 7 is sequentially moved from facing the face surface 44 to the tunnel axis. The projection head 7 can be rotated to a position where it is approximately perpendicular to the tunnel axis, and the material A is sprayed sequentially from the central area to the end areas of the face 44. The left and right corners 45, 45 of the face surface 44
is sprayed. Therefore, although it is a movable trolley type, it has the excellent effect of automatically and efficiently spraying not only the cylindrical surface of the tunnel but also the tip surface of the face including the corner portions. Furthermore, as a turning mechanism for the projection head 7, the slide base 3 for axial movement is effectively utilized, and two cylinders 19a, 19 are installed in which the sprocket 17 fixed to the support shaft 13 is built into the slide base 3.
It communicates with the piston b through the chain 18, and the cylinders 19a and 19b are operated in opposite directions by the switching valve 20 to obtain the turning motion.
Excellent effects can be obtained in that a reliable turning operation can be realized with a simple and inexpensive mechanism, and the thickness of the slide base 3 can be made thin.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a tunnel spraying machine according to the present invention.

FIG. 2 is a plan view showing an embodiment of the tunnel spraying machine according to the present invention.

FIG. 3 is a front view showing an embodiment of the tunnel spraying machine according to the present invention.

FIG. 4 is a sectional view showing an example of a spraying machine main body according to the present invention.

FIG. 5 is a longitudinal sectional front view of the projection head in FIG. 4;

FIG. 6 is a partially cutaway bottom view of FIG. 4;

FIG. 7 is an explanatory diagram showing the construction state of the spraying machine of the present invention.

FIG. 8 is an explanatory diagram showing the construction state of the spraying machine of the present invention.

[Explanation of symbols] 1... Base, 2... Spraying machine body, 3... Slide base, 5... Hopper, 6...
. . . Screw tube, 7 . . . Projection head, 13 . . . Support shaft, 15 . . . Table, 17 .