JPS6123119Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tunnel lining device.

When covering tunnels, shafts, waterways, cables, etc. with concrete or mortar, the conventional method is to blow the kneaded material from a spray machine using compressed air as a carrier medium, and spray it onto the construction surface from a spray nozzle at the end of a hose. had been adopted. However, with this method, the construction range is limited to a narrow area in the nozzle axis direction, and the nozzle angle must be successively changed in order to line the entire circumference of the cylindrical cross section, which has the disadvantage of poor construction efficiency.

Additionally, this method involves blowing the material with compressed air, resulting in high rebound and dust generation.
In addition to problems that cause deterioration of the working environment, the strength of the lining layer tends to decrease due to the entrainment of compressed air into the material.In addition, when quick-setting materials or jet cement are used, rotors, nozzles,
This caused problems such as clogging of the hoses, making it difficult to spray smoothly.

The present invention eliminates the drawbacks of the conventional ones as described above, and has a relatively simple and compact structure that allows for continuous and highly efficient lining of the inner surfaces of tunnels, and even when using fish cake wood, jet cement, etc. The present invention aims to provide a tunnel lining device that does not cause troubles such as clogging of equipment, and can form a coating layer with good strength and less dust and rebound loss.

The tunnel lining device according to the present invention will be described above with reference to the accompanying drawings.

In the drawings, reference numeral 1 designates a projection impeller equipped with a plurality of pockets 2 divided into a plurality of pockets in the circumferential direction by a vane plate 3, with an opening 4 formed in the center of its back, and an inner diameter formed at the rear of the pocket 2. A rotary cylinder 5, which is substantially the same as the hole 4, is detachably connected thereto. This rotating shaft 5 is a support member 7 that stands up from a pedestal 6.
At the same time, a drive pulley 10 attached to the output shaft of a motor 9 on a pedestal is supported on the rear side by a bearing 8.
A driven pulley 11 connected to the rotary cylinder 5 is fitted.
The projection impeller 1 can be rotated at high speed around a horizontal axis.

Reference numeral 12 denotes a delivery cylinder, which is fitted concentrically into the rotary cylinder 5 with a slight gap, and is horizontally supported by a receiving member 13 erected on the pedestal 6. The front end of the delivery cylinder 12 is passed through the opening 4 of the projection impeller 1, and a material hopper 14 is attached to the rear side. A bearing 15 is attached to the rear end of the delivery cylinder 12, and a screw shaft 16 is inserted into the delivery cylinder via the bearing 15.
is interpolated. This screw shaft 16 ends at an appropriate rear position from the front part of the delivery cylinder 12,
On the outer periphery of the shaft up to this tip, there are screw blades 17 for feeding the material C introduced from the material hopper 14 toward the projection impeller 1, and a chain for applying the driving force from the motor 18 on the pedestal to the screw shaft 16. A transmission mechanism 19, such as a sprocket, is attached to each. Further, the axial center of the screw shaft 16 is provided with the material C charged into the material hopper 14.
A supply hole 20 for any material C' constituting the formulation with
The rear end of this supply hole 20 is connected to a conduit 22 via a swivel joint 21, and the material C' is introduced from a supply source via a pump 23 installed on the pedestal 6, for example. There is.

24 is a shaft whose base end is fixed to the inner surface of the front plate of the projection impeller 1, which faces the tip of the screw shaft 16 at an appropriate interval, and has a plurality of arms 25 fixed to the outer circumference extending in the radial direction. , these arms 25, 25 have a stirring blade 2 which has a feeding mechanism by being twisted at an appropriate angle in the material feeding direction.
6 is installed.

Reference numeral 27 denotes a truck mechanism for displacing the projection impeller 1 and the delivery cylinder 12 via the pedestal 6; It is equipped with a jacket 30 for tying.

In this embodiment, in order to adjust the winding position of the projection impeller 1, for example, to thicken the arch part and side surfaces and thinly line only the bottom part, the delivery cylinder 12 is divided into a front cylinder 12a and a rear cylinder 12b.
The front cylinder 12a has an arc-shaped hood 121 that covers several pockets 2 constituting the projection impeller 1.
The front cylinder 12a is rotatably connected to the rear cylinder 12b. In the embodiment shown in FIG.
A and the rear cylinder 12b are joined by a flange with bolt holes drilled at intervals, and when the winding position is changed, the bolts are loosened and the front cylinder 12a is rotated, and an arbitrary bolt hole is selected for connection. . In FIG. 3, a front cylinder 12a and a rear cylinder 12b are connected by a socket 32 via a sealing material 31, and a handle 33 provided on the outer periphery of the socket 32 allows the front cylinder 12a to be rotated. In addition, the position of the hood 121 may be changed using a motor, a cylinder, or the like.

In other figures, 34 is a material supply device for the material hopper 14.

Since the present invention has the above-mentioned configuration, when lining tunnels with concrete or mortar, the platform is raised and lowered by the trolley mechanism 27 so that the projection impeller 1 is located approximately at the center of the tunnel cross section. The material C of a predetermined composition is fed from the material supply device 34 to the material hopper 14, and the material C is fed from the pump 23 through the conduit 22.
C' and drives the motors 9 and 18 together with it. In this way, the material C is sequentially forwarded by the screw blade 17 in the delivery cylinder, and the material
C' is the supply hole 20 drilled in the screw shaft 16.
At the same time, the projection impeller 1 rotates at high speed around the delivery cylinder 12, and the shaft 24 also rotates at high speed around the axis of the delivery cylinder 12.

When the material C reaches the tip of the screw shaft 16, material C' is ejected from the tip of the screw shaft, and this material C' is reflected by the tip of the shaft 24 rotating at high speed in front and finely dispersed. Then, it is uniformly added to the material C, which has become dispersed due to the turbulent flow caused by the difference in rotational speed between the screw shaft 16 and the shaft 24. The several kinds of materials mixed in this way are then transferred to the region of the shaft 24, where they are rapidly kneaded and forwarded by the stirring blades 26 attached to this shaft 24, and become a homogeneous mixed material. and reaches the front end of the delivery cylinder 12.

The material that has reached the front end of the delivery tube 12 in this manner is sequentially discharged in a fixed amount into the center of the projection impeller 1, and is continuously projected from each pocket 2 in the radial direction by the centrifugal force accompanying the high speed rotation of the projection impeller 1. As a result, a lining layer B of a constant width is deposited over the entire circumference of the same cross section of the cylindrical surface A, and by moving the cart 29 at a predetermined speed in the direction of the tunnel axis, a continuous lining layer is automatically formed as shown in Fig. 1. is formed. In this case, in addition to being a projection method that does not use compressed air, different materials are effectively kneaded by the screw shaft 16 and high-speed rotation shaft 24, so there is little rebound or dust generation, and there is no reduction in strength due to air entrainment. No worries.

Furthermore, the materials necessary for lining construction, that is, aggregates such as sand, gravel, reinforcing fibers, cement, admixtures such as quick-setting materials and water-reducing materials, and water can be freely selected from both the delivery tube 12 and the screw feeder 16. Since it can be supplied and projected, appropriate construction can be carried out in response to the properties of the material and on-site conditions. In other words, when a mixture of aggregate, cement, and water or an admixture added thereto is kneaded and supplied from the material hopper 14, the water content of the aggregate and the characteristics of the cement and admixture (for example, if jet cement is used If the screw shaft 16 is extended into the hollow part of the impeller and water is added from the supply hole in the shaft center, there is a possibility that the reaction will proceed before the injection and cause adhesion in the delivery tube. However, in this invention, the water supplied from the screw 16 is dispersed into the other materials and rapidly stirred before reaching the impeller, so the progress of the reaction is well controlled. At the same time, it becomes possible to project smoothly without generating dust. In addition, if spring water occurs during projection or it becomes necessary to improve the strength, it can be dealt with immediately by supplying a unit of mixed material, cement alone, or a mixture of this and water through the screw shaft 16. becomes.

According to the present invention described above, a projection impeller 1 that can freely rotate at high speed around the delivery cylinder 12 having a material hopper 14 is provided at the front part thereof, and a material supply hole 20 is bored in the delivery cylinder axially. In addition to inserting the screw shaft 16, a shaft 24 facing the screw shaft 16 is fixed to the projection impeller 1, and a stirring blade 26 is disposed on this shaft 24.
The simple structure makes it possible to line the inner periphery of tunnels extremely efficiently. Moreover, not only can materials such as liquids be sent separately using the screw shaft for material feeding, but also this material and the material on the outer periphery of the screw shaft can be lined. Since the materials can be mixed efficiently and uniformly just before being projected by the projection impeller, there is less dust and rebound, and there are no problems caused by adhesion of materials, making it possible to adjust the water-cement ratio for lining. Excellent effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the tunnel lining device according to the present invention, Fig. 2 is a longitudinal cross-sectional side view of the device of the present invention in Fig. 1, Fig. 3 is a partially enlarged view thereof, and Fig. 4 is a sectional view of FIG. 3; 1... Projection impeller, 12... Delivery tube, 14...
...Material hopper, 16...Screw shaft, 17...
Feed blade, 20... Supply hole, 24... Shaft, 26...
...Stirring blade, C, C'...Material.

Claims (1)

[Scope of utility model registration request] A projection impeller that can freely rotate at high speed is provided at the front of a delivery cylinder 12 equipped with a material hopper 14, and a screw shaft 16 with the material supply hole 20 as the axis is inserted into the delivery cylinder. The impeller 1 has a shaft 2 opposite to the screw shaft 16.
4 is fixed, and a stirring blade 26 is arranged on this shaft 24.