JPH0540158Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tunnel lining device, and more particularly to a device for lining a tunnel with concrete or mortar by a projection method.

[Conventional technology and its problems]

The spraying method is commonly used as a primary wrapping method for excavated surfaces in tunnel construction. However, the equipment for implementing this construction method generally consists of a means for transporting concrete using compressed air as a medium and a spray nozzle at the tip of the transport means. Because it is sprayed, there are problems such as rebound and dust generation, which worsens the working environment, reduces material yield, and tends to deteriorate the quality of the lining layer due to air entrainment.
In addition, since a cylindrical body called a nozzle is used, the construction area per unit is narrow, and lining the entire tunnel cross section requires operations to sequentially change the nozzle angle, resulting in poor construction efficiency and workability.

As a countermeasure, Publication No. 61-23116,
In Japanese Utility Model Publication No. 61-23119, etc., a lining device has been proposed that uses a projection impeller to adhere material to a tunnel cross section using centrifugal force.

According to this device, the problems of the above-mentioned spraying device are alleviated. However, in these prior arts, a cylindrical screw feeder is inserted into a rear cylinder connected to a projection impeller, the screw shaft is a hollow shaft, and the material is fed progressively by rotation of the screw on the outer periphery of the screw shaft. At the same time, the quick-setting agent was sent from the rear end of the screw shaft through the inside of the screw shaft to the tip, so that the quick-setting agent merged with the material sent into the projection impeller by the screw. As a result, the following problems arose.

The feeding direction of the material and the feeding direction of the quick setting agent are the same, and since they are simply combined in the projection impeller, the stirring and mixing efficiency is poor and it is difficult to uniformly disperse the material. For this reason, there are problems in applying it to tunnel construction where there is a lot of spring water, such as the strength of the lining layer becoming insufficient or the strength dispersion becoming large.

Since the outer cylinder is cantilever-supported within the rear cylinder of the projection impeller, and the screw shaft is also cantilever-supported inside and rotated, the operation tends to become unstable due to vibrations and shocks. Since a hopper is provided in a part of the outer cylinder and materials are fed into this area from a belt conveyor, the overall structure is complex and large, requiring a special trolley, making it difficult to robotize or mount on other machines. It is not suitable for such things.

Since the inside of the screw shaft is used as a passage for the quick-setting agent, it interferes with the main inspection, and the entire structure must be disassembled to remove deposits, which takes time and effort.

[Means for solving problems]

This invention was devised through research to solve the above-mentioned problems, and its purpose is to easily and compactly produce concrete with uniform material and less variation while taking advantage of the advantages of the projection method. It is an object of the present invention to provide a tunnel lining device of this type that can be lined with a structure that is easy to maintain and can be easily maintained.

To achieve this objective, the present invention has developed an impeller with a pressure-feeding sleeve connected to an external pump through a conveying hose, inside an impeller having a plurality of partition vanes and a removable end plate at the axial tip. At the same time, an injection tube extending toward the pressure-feeding sleeve and having a nozzle hole and a stirring member on the circumferential surface is fixed at the center of the end plate, and this injection tube is connected to an external source via a universal joint. This is connected to the agent supply hose.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the tunnel lining device according to the present invention, in which 1 is an impeller, and a plurality of projection pockets are arranged at equal intervals in the circumferential direction by partition blades 10 in the form of plates or boxes. 1
1, 11, and a main body 1a whose axial tip is closed by an end plate 12, and a rotary cylinder 1c coaxially fixed to the opposite side of the end plate 12 with or without an intermediate cylinder 1b. We are prepared. The end plate 12 can be attached to and detached from the main body 1a using bolts 13. Further, the intermediate cylinder 1b is also connected to the main body 1 by the bolt 13.
It can be attached to and detached from a.

2 is a base having a radial bearing 20;
The radial bearing 20 rotatably supports the rotary cylinder 1c. Preferably, a reversible impeller motor 2 is mounted at a suitable location on this base 2.
1 is mounted, and the impeller 1 is rotated at high speed via a transmission element 14 such as a pulley provided on the rotating cylinder 1c. In this embodiment, the impeller motor 21 is installed in the casing of the radial bearing 20, but it may also be installed in the rear area of the base 2 as shown in FIGS. 3 and 4.

Reference numeral 3 denotes a pressure feeding sleeve, which is disposed concentrically with the impeller 1 and is freely rotatably supported by a radial bearing 24 installed inside the rotating cylinder 1c.
A conductive element 30 such as a sprocket is provided on the outer periphery,
For example, the sleeve motor 23 mounted on the base 2 via a support 22 rotates the sleeve continuously or intermittently.

The pressure-feeding sleeve 3 has a tapered enlarged diameter portion 31 formed from a portion in front of the main body 1a, and a large diameter portion 32 that ends near the end plate 12 from the end of the tapered enlarged diameter portion 31. A control hole (including a notch) 33 communicating with the pocket 11 of the impeller 1 is formed in the large diameter portion 32, and when rotated by the sleeve motor 23, the phase is shifted and the projection direction is controlled. ing.

Further, a universal joint 34 is connected to the rear end of the pressure-feeding sleeve 3, and a transfer hose 8 from a wet pump (not shown) is connected to the universal joint 34.

Preferably, the pressure-feeding sleeve 3 is divided into two parts with the tapered enlarged diameter part 31 as a border, and the flange 3
5 and bolts 36.

Reference numeral 4 denotes an injection tube, which is exchangeably fixed to the center of the end plate 12 with a threaded portion 42 at its base end, and the tip thereof projects into the pressure-feeding sleeve 3. This protrusion length needs to reach at least the tapered enlarged diameter portion 31.

The injection pipe 4 is provided with a plurality of nozzle holes 40, 40 at least on its circumferential surface. The injection angle of the nozzle hole may be perpendicular to the axis, or may be perpendicular to the tapered enlarged diameter portion 31. Further, the nozzle hole may also be formed at the tip depending on the case.

A stirring member 41 is fixed to the outer periphery of the injection tube 4. At least one stirring member 41 is provided. The one shown is 180 in the circumferential direction.
A plurality of sets of these are disposed in the longitudinal direction of the injection tube 4 with the phases shifted from each other. The stirring member 41 has a planar wedge shape to assist in pumping the material, but is not limited to this.

Reference numeral 5 denotes a universal pipe joint provided on the outer surface side of the end plate 12, which holds a connecting pipe 6 communicating with the injection pipe 4 so as to be relatively rotatable. 7 is now connected.

[Effect of the embodiment]

According to the present invention, in order to line the tunnel A with concrete (including mortar, the same shall apply hereinafter), the transfer hose 8 from the wet pump is connected to the universal joint 34 in advance, and the connection pipe 6 is used as a means for pumping a material such as an quick-setting agent. Connect the medication supply hose 7 from. The wet pump may be of any type, such as a double piston type or a squeeze type. The preparation can be either powder or liquid,
The conveying method may be either force feeding of the medicine alone or force feeding using air as the conveying medium.

In this state, the entire apparatus is placed at a predetermined position within the tunnel, and the wet pump pumps the material, and the pumping means pumps the medicine. At the same time, the impeller motor 21 is driven. Since the material is pumped, it is possible to use a material that has been carefully refined to a predetermined slump value. At step 31, the movement speed is reduced and a moderately dispersed state is achieved.

On the other hand, the injection pipe 4 is connected to the end plate 2 that constitutes the impeller 1.
Since the injection tube 4 is fixed at Enters the injection pipe 4 from the connection pipe 6,
The material is injected from the nozzle holes 40, 40 in a direction countercurrent or perpendicular to the feeding direction of the material. At the same time, the stirring members 41, 41 on the outer periphery of the injection tube 4 shear the material at high speed, so that the material and the agent are vigorously mixed, and the agent is efficiently and uniformly dispersed in the material.

In this state, the mixed material is sucked into the projection pocket 11 of the impeller 1 through the control hole 33, and is projected in the tangential direction of the impeller due to centrifugal force, and is directed to the tunnel inner surface A.
Shockingly attached to. Therefore, the concrete lining B can be constructed in a desired range by driving and controlling the sleeve motor 23 to move the control hole position while moving the entire apparatus in the longitudinal direction of the tunnel.

In the present invention, instead of feeding the material with a screw, the material is pumped from a wet pump to the impeller 1 through the pumping sleeve 3, and is directed from the end plate 12 side at the axial tip of the impeller 1 to the material in the pumping sleeve 3 for rapid bonding. I am trying to inject drugs. Therefore, the size in the radial direction can be small, and the size in the axial direction can also be reduced. Furthermore, there is no need for a belt conveyor for feeding materials, and it is sufficient to simply connect the conveyance hose 8. Further, there is no need for a drive means or measures against deflection, which are required when a screw is built-in. Therefore, the entire device becomes simple, compact, and lightweight, and the degree of freedom in mounting the device increases.

FIGS. 3 and 4 show examples of the use of the device of the present invention. FIG. 3 shows an example in which the vehicle is mounted on a traveling bogie 60, in which a slide frame 62 operated by a horizontal cylinder 63 is arranged on the traveling bogie 60, which is equipped with wheels 61 that run on rails 69 laid in a tunnel A. The upper and lower cylinders 6 are mounted on the slide frame 62.
A support frame 64 is provided which is raised and lowered by means 5, and the apparatus of the present invention is mounted on this support frame 64 with the base 2.

Figure 4 shows an example in which the base 2 is mounted on the tip of a hydraulic boom 66 of a necessary construction machine such as an excavator. It is possible to easily create a remote-controlled robot without using a cart.

In terms of maintenance, the end plate 12 and the injection tube 4 are separated by removing the bolts 13, making it easy to inspect, clean, repair, replace, etc. the injection tube 4. The opening allows the sleeve 3 to be inspected, repaired, replaced, etc. easily.

Although the wet pump 67 and the agent pressure feeding means 68 are mounted on the traveling trolley 60 in the embodiment shown in FIG. 3, they can be freely selected depending on the piping, so they can be placed at any location such as on another trolley or at the mine entrance. good.

[Effect of idea]

According to the present invention described above, a pressure-feeding sleeve 3 connected to an external pump via a conveyance hose 8 is disposed concentrically with the impeller 1 within the impeller 1 having a plurality of partition blades 10, and
A pressure-feeding sleeve 3 is placed in the center of the end plate 12 of the impeller 1.
An injection pipe 4 extending toward is fixed, a nozzle hole 40 and a stirring member 41 are provided on the circumferential surface of this injection pipe 4,
Since the injection pipe 4 is connected to the agent supply hose 7 from the outside via the universal joint 5, the mechanism can be simplified.
It can be made small and lightweight, and can be used to line tunnels from large cross sections to small cross sections simply by incorporating it as the head of a desired means with traveling and lifting functions.

Furthermore, an injection tube 4 having a nozzle hole 40 and a stirring member 41 is fixed at the center of the end plate 12 at the tip in the axial direction of the impeller, and the injection tube 4 is fixed to introduce the agent from the outside. The agent is injected in the countercurrent direction or in the shearing direction to the material flowing into the impeller 1, which rotates at high speed, and is stirred at high speed, making it possible to mix uniformly and thoroughly in a short time. It is possible to form a concrete lining layer with good impact adhesion performance and good strength with little variation.

In addition, the mechanically important injection pipe 4 is provided on the end plate 12, and since the end plate 12 is removable from the impeller 1, inspection, repair, replacement, etc. can be easily performed by removing the end plate 12. Go, end plate 12
At the same time, maintenance of the pressure-feeding sleeve 3 is carried out by removing the
Since inspections and the like can also be carried out, excellent effects such as good maintenance workability and work efficiency can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the tunnel lining device according to the present invention, and Fig. 2 is a sectional view showing an embodiment of the tunnel lining device according to the present invention.
3 is a side view showing an example of use of the present invention, and FIG. 4 is a side view showing another example of use. 1... Impeller, 3... Sleeve for pressure feeding, 4...
...Injection pipe, 5...Universal pipe joint, drug supply hose,
8...Transportation hose, 10...Partition blade, 12...
... End plate, 40 ... Nozzle hole, 41 ... Stirring member.

Claims (1)

[Scope of utility model registration request] The impeller 1 has a plurality of partition blades 10 and a removable end plate 12 at the axial end. A pressure-feeding sleeve 3 connected to an external pump via a conveying hose 8 is disposed concentrically with the impeller 1. A nozzle hole 40 and a stirring member 41 are disposed on the circumferential surface of the impeller 1, and extend toward the pressure-feeding sleeve 3 from the center of the end plate 12.
4. A tunnel lining device comprising: an injection pipe having a groove formed therein and connected to an external agent supply hose via a universal joint.