JPH0226040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for primary lining (forming) a concrete wall on the inner peripheral surface of an excavated tunnel in tunnel construction.

Conventionally, there is a spraying method as a method for primary lining this type of concrete wall. This is a method in which concrete for primary spraying is directly sprayed from a nozzle onto the inner peripheral surface of an excavated tunnel.

However, with this method, the sprayed concrete
Spraying efficiency is extremely poor as it rebounds by 30-60%.
In addition, in the past, a quick-setting agent was added to the concrete in order to quickly harden the sprayed concrete, but the conventional spraying method causes a lot of splashing, which wastes not only the concrete but also the expensive quick-setting agent, making it extremely uneconomical. It also had the disadvantage of being.

The present invention is able to self-hold the concrete to be sprayed and temporarily holds the concrete until it hardens to a certain degree, thereby preventing the concrete from rebounding, thereby improving the efficiency of the spraying operation and reducing the waste of concrete and expensive quick-setting agents. Moreover, it is possible to obtain a smooth concrete finish surface.

Various embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, the invention as set forth in claim 1 applies a release material to the outer periphery of the belts 21 and 24 of the concrete holding device 3 that is in contact with the concrete using the rotatable belts 21 and 24, The holding device 3 is opposed to the inner circumferential surface 2 of the excavated tunnel 1, and a concrete filling space 4 is formed between the inner circumferential surface 2 and the concrete holding device 3,
This concrete filling space 4 is filled with concrete 6 from the supply part (nozzle) 5 of the concrete supply device, and after the filled concrete 6 hardens until it can self-hold, the concrete holding device 3
The holding device 3 is moved in the circumferential direction of the inner peripheral surface 2 of the tunnel (in the direction of the arrow in FIG. 1) while the belts 21 and 24 remain in close contact with the concrete, and at the same time the belts 21 and 24 are held. A new concrete filling space 4 is created between this concrete holding device 3 and the inner circumferential surface 2 by rotating the device 3 in the opposite direction to the moving direction and at a rotational speed equivalent to the moving speed of the holding device 3. After that, the concrete filling space 4 is filled with concrete 6, the concrete holding device 3 is moved in the circumferential direction of the inner peripheral surface 2 of the tunnel, and the belts 21, 24 are rotated in the opposite direction to this moving direction. Repeat intermittently,
A concrete wall 7 is formed in the circumferential direction of the inner peripheral surface 2 of the tunnel.

After forming the concrete wall on the entire circumferential direction of the inner circumferential surface 2 of the tunnel 1, the concrete holding device 3 is moved in the excavation direction of the tunnel 1 to form a concrete filling space 4 and pouring concrete 6 into the filling space 4. Filling is repeated sequentially to form concrete walls in the tunnel excavation direction.

In this case, the concrete holding device 3 and the supply section 5 of the concrete supply device are connected from the lower part 11 of one side wall of the inner peripheral surface 2 of the tunnel to the top end 1 as shown in FIG.
2 to the other side wall lower part 13. However, if this is not possible, move the concrete holding device 3 and the supply section 5 of the concrete supply device from the lower part 11 of one side wall of the inner peripheral surface 2 of the tunnel to the top end 12 of the tunnel.
A concrete wall 7 is formed on the left half of the tunnel, and then the concrete holding device 3 and the supply section 5 of the concrete supply device are moved from the lower side wall 13 on the opposite side of the inner peripheral surface 2 of the tunnel to the top end 12 of the tunnel. 1
The concrete wall 7 may be formed on the right half of the wall.

In this case, if the supply section 5 of the concrete supply device is located above the concrete holding device 3 as shown in FIG. The concrete wall 7 becomes an obstacle and it is not possible to fill the top end 12 with concrete 6 from the supply section 5 of the concrete supply device. Therefore, when filling the top end 12 with concrete 6, as shown in FIG. 6
so that it is filled with

The concrete wall 7 of the top end 12 thus formed is as shown in FIG.
The 5th side protrudes lower than the opposite side. This protrusion 1
Item 6 can be removed later if it interferes with the construction work.

As an example of the concrete holding device 3 used in the present invention, the concrete holding device 3 shown in FIG. When the belt 21 is wound around the shaft 18 and the drive shaft 18 is rotated by a drive device 22 such as a motor, the belt 21 is wound around the shaft 18. Further, a belt cleaner 23 such as a wire brush is provided on the back side of the belt 21, and when the belt 21 is wound, it slides into contact with the belt cleaner 23 to remove dirt and deposits from the belt 21. . The belt 21 is preferably retractable.

Another example of the concrete holding device 3, shown in FIG. Wrap the
When the drive shaft 18 is rotated by a drive device 22 such as a motor, the endless belt 24 is wound around the drive shaft 18, and a belt cleaner 23 such as a wire brush is installed on the back side of the endless belt 24.
A release agent spray device 25 is provided.

The belt cleaner 23 is configured to come into sliding contact with the belt cleaner 23 when the endless belt 24 is wound to remove dirt and deposits from the endless belt 24. At this time, a release agent is sprayed from the release agent spray device 25 to better remove dirt and deposits adhering to the endless belt 24.

The concrete holding device 3 and the supply section 5 of the concrete supplying device are attached to a support arm 26 to form an attachment 27 as shown in FIG.

The concrete holding device 3 is rotatably attached to the support arm 26 and is attached to the arm 2 of the cylinder 28.
By expanding and contracting 9, it can be freely rotated in the direction of the arrow E-L in the figure.

The supply section 5 of the concrete supply device is attached to the support arm 26 via an L-shaped arm 30.
As shown in FIG. 2, a swinging device 31 allows the support arm 26 to swing to the left and right along the axis X--X.

3, the attachment 27 shown in FIG. 7 is attached to the tip of the support 8 of a moving body 32 such as a civil engineering machine, and the support 8 is rotated in the circumferential direction of the tunnel 1 to make concrete When the holding device 3 and the supply section 5 of the concrete feeding device are rotated in the same direction and the support body 8 is expanded and contracted, the distance between the concrete filling space 4 between the inner peripheral surface 2 of the tunnel and the concrete holding device 3 is reduced. is adjusted.

In the device shown in FIG. 4, the attachment 27 shown in FIG. 7 is supported by the support portion 32 of the guide frame 9 placed inside the tunnel 1, and the support portion 33 is curved in a similar shape to the inner peripheral surface 2 of the tunnel. Support part 33
When the attachment 27 is moved along the concrete holding device 3 and the supplying section 5 of the concrete supplying device, the concrete holding device 3 and the supply section 5 of the concrete supplying device are rotated along the inner circumferential surface 2 of the tunnel. Further, by raising and lowering the support part 33, the interval of the concrete filling space 4 between the inner circumferential surface 2 of the tunnel and the concrete holding device 3 can be adjusted.

To use the concrete forming apparatus shown in FIG. 3, the movable body 32 is moved to a predetermined position in the tunnel, and the support body 8 of the movable body 32 is operated to hold the concrete holding device 3 when it is attached to the support body 8. A concrete filling space 4 is formed between the concrete holding device 3 and the inner peripheral surface 2 of the tunnel so as to face the inner peripheral surface 2 of the tunnel, and concrete 6 is filled therein from the supply section 5 of the co-concrete supply device. good.

When the filled concrete 6 has hardened to the extent that it can be self-retained, the support 8 of the movable body 32 is rotated in the direction of the arrow in FIG. 5 upward to form a new concrete filling space 4 between the concrete holding device 3 and the inner peripheral surface 2 of the tunnel, and then filling the concrete filling space 4 with concrete 6 from the supply section 5 of the concrete supply device. do it.

Thereafter, this operation is repeated to form the concrete wall 7 on the inner peripheral surface 2 of the tunnel.

In order to form a concrete wall on the top end 12, as shown in FIG. Fill 6.

To use the concrete forming apparatus shown in FIG.
facing a predetermined position on the inner peripheral surface 2 of the tunnel,
A concrete filling space 4 may be formed between the concrete holding device 3 and the inner circumferential surface 2 of the tunnel, and the concrete filling space 4 may be filled with concrete 6 from the supply section 5 of the concrete supply device.

When the filled concrete 6 hardens to the extent that it can be self-retained, the concrete holding device 3 attached to the support portion 33 of the guide frame 9 is moved upward to add new concrete between the device 3 and the inner peripheral surface 2 of the tunnel. A filling space 4 may be formed, and concrete 6 may be filled into the concrete filling space 4 from the supply section 5 of the concrete supply device.

Thereafter, this operation is repeated to form the concrete wall 7 on the inner peripheral surface 2 of the tunnel.

As described above, the invention described in claim 1 of the present application fills the concrete filling space 4 between the inner circumferential surface 2 of the excavated tunnel 1 and the concrete holding device 3 with concrete 6, Since the concrete 6 to be filled is temporarily held until it hardens to the extent that it can be self-retained, there is almost no splashing of the concrete 6, so the work of forming the concrete wall 7 is significantly improved, and the concrete 6 is It is economical because it does not go to waste, and it is even more economical because it requires less quick-setting agent to be added to the concrete.

Further, after the concrete 6 has hardened to the extent that it can self-retain, the concrete holding device 3 is moved in the circumferential direction of the inner circumferential surface 2 of the tunnel to form a new concrete filling space 4, and the concrete 6 is transferred to this concrete filling space 4. By simply filling the concrete wall and repeating this process, the concrete wall 7 can be continuously formed in the circumferential direction of the inner circumferential surface 2 of the tunnel.Furthermore, by moving the concrete retaining device 3 in the excavation direction of the tunnel, Similarly to forming the concrete wall 7 in the circumferential direction of the circumferential surface 2, just by filling the concrete filling space 4 with concrete 6, the concrete wall 7 can be easily formed in the tunnel excavation direction.
Since it is possible to form the concrete wall 7 continuously, the work of forming the concrete wall 7 becomes very easy.

In particular, in the present invention, the belts 21 and 24 of the concrete holding device 3 are rotated in the opposite direction to the moving direction of the holding device 3 when the holding device 3 is moved, and at a rotational speed equivalent to the moving speed of the holding device 3. Since the device 3 is moved, the relative speed of the belts 21 and 24 seen from the concrete 6 is approximately 0, and therefore the belt 2 of the holding device 3 is
Even if 1 and 24 are moved while remaining in close contact with the concrete 6, the surface of the concrete 6 does not collapse and is finished smoothly. Moreover, the holding device 3 is also easy to handle.

Moreover, since a release material is applied to the outer peripheral sides of the belts 21 and 24 that contact the concrete,
When the holding device 3 is moved, the surface of the concrete 6 becomes more difficult to collapse.

Since the concrete wall forming apparatus according to claims 2 and 3 uses the rotary belts 21 and 24, it is possible to apply a release agent as a pre-work to the outer peripheral sides of the belts 21 and 24 that contact the concrete. This makes it easier to remove the release agent from the belts 21 and 24.
It becomes easier to apply evenly. Furthermore, cleaning of the belts 21 and 24 after concrete filling work is also facilitated.

In addition, since the belts 21 and 24 are provided on the outside of the belt support 20 of the concrete holding device 3, even when the concrete filling space 4 is filled with concrete 6, the shape of the belts 21 and 24 is maintained, so that the concrete wall 7 gives a smooth finish.

Next, the invention described in claim 2 of the present application provides an attachment 27 to which the concrete holding device 3 and the supply section 5 of the concrete supply device are attached.
The inner circumferential surface 2 of the tunnel can be easily removed by simply attaching it to the support (arm) 8 of a moving body 32 such as a civil engineering work vehicle and rotating the support 8 in the circumferential direction of the inner circumferential surface 2 of the tunnel.
The concrete filling space 4 can be easily formed in the circumferential direction of the concrete filling space 4, and since the interval between the concrete filling spaces 4 is freely adjustable, it is easy to form a concrete wall 7 of a desired thickness just by filling the space with concrete. It can be formed easily and economically.

In addition, since the supply part 5 of the concrete supply device is swingable in the width direction of the concrete holding device 3 so that the supply angle to the concrete filling space 4 can be adjusted freely, the direction of the filling port of the concrete filling space 4 changes somewhat. However, the concrete filling space 4 can be easily filled with concrete 6, and the entire width of the concrete holding device 3 can be evenly filled with concrete.

Next, the invention described in claim 3 of the present application provides an attachment 2 to which the concrete holding device 3 and the supply section 5 of the concrete supply device are attached.
7 to the guide frame 9 installed in the tunnel, and attach the attachment 27 to the guide frame 9.
By moving the concrete along the inner surface 2 of the tunnel, it is possible to easily form a concrete filling space 4 in the circumferential direction of the inner peripheral surface 2 of the tunnel, and since the interval between the concrete filling spaces 4 can be adjusted freely, it is possible to form a concrete filling space 4 to a desired thickness. The concrete wall 7 can be formed easily and economically.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the method according to the present invention, and FIG.
The figure shows a method of forming a concrete wall at the top of the present invention, and is an explanatory view taken longitudinally in the excavation direction of the tunnel. FIG. 5 is an explanatory side view showing an example of the concrete holding device 3 which is a component of the device according to the present invention, and FIG. 6A is a side view showing another example of the concrete holding device 3 which is a component of the device according to the present invention. 7A is a side view showing an example of an attachment that is a component of the present invention, and FIG. 7B is a partial rear schematic view of the attachment shown in A. be. 1 is a tunnel, 2 is an inner peripheral surface, 3 is a concrete holding device, 4 is a concrete filling space, 5 is a supply part of a concrete supply device, 6 is concrete,
7 is a concrete wall, 8 is a support, and 9 is a guide frame.

Claims (1)

[Scope of Claims] 1. A release material is applied to the outer periphery of the belts 21, 24 of the concrete holding device 3 using the rotatable belts 21, 24 in contact with concrete, and the holding device 3 is attached to the inner periphery of the excavated tunnel 1. A concrete filling space 4 is formed between the inner circumferential surface 2 and the concrete holding device 3 so as to face the surface 2, and the concrete filling space 4 is filled with concrete 6 from the supply section 5 of the concrete feeding device. After the concrete 6 hardens until it can self-hold, the belts 21 and 24 of the concrete holding device 3
While moving the holding device 3 in the circumferential direction of the inner peripheral surface 2 of the tunnel while keeping the belts 21 and 24 in close contact with the concrete, the holding device 3
A new concrete filling space 4 is formed between this concrete holding device 3 and the inner circumferential surface 2 by rotating it in a direction opposite to the moving direction of the concrete holding device 3 and at a rotational speed equivalent to the moving speed of the concrete holding device 3. , thereafter filling the concrete filling space 4 with concrete 6,
The movement of the concrete holding device 3 in the circumferential direction of the inner circumferential surface 2 of the tunnel and the rotation of the belts 21 and 24 in the opposite direction to this moving direction are intermittently repeated, thereby forming a circle on the inner circumferential surface 2 of the tunnel. A method for forming a concrete wall in tunnel construction, characterized in that a concrete wall 7 is formed in the circumferential direction. 2 A concrete holding device 3 that faces the inner circumferential surface 2 of the excavated tunnel and forms a concrete filling space 4 between the inner circumferential surface 2; Supply section 5 of the concrete supply device for filling
and a support 8 which can be rotated in the circumferential direction along the inner circumferential surface 2 of the tunnel and which can move the holding device 3 closer to or away from the inner circumferential surface 2 of the tunnel. The concrete holding device 3 is configured such that belts 21 and 24 are rotatably provided on the outside of a belt support 20, and the feeding section 5 is configured to freely adjust the feeding angle to the concrete filling space 4. A concrete wall forming device for tunnel construction featuring: 3. A concrete holding device 3 that faces the inner circumferential surface 2 of the excavated tunnel 1 and forms a concrete filling space 4 between the inner circumferential surface 2 and the concrete holding device 3 installed inside the tunnel 1. and a guide frame 9 to which a supply section 5 of a concrete supply device for filling concrete filling space 4 with concrete is attached.
1 and 24 are rotatably provided, and the guide frame 9 is arranged so that the concrete holding device 3 and the supply section 5 can move along the inner circumferential surface 2 of the tunnel 1. A concrete wall forming device for tunnel construction, characterized in that the concrete wall is formed along a curved line.