JPH08170495A - Concrete placing opening - Google Patents

Abstract

PURPOSE: To provide a concrete placing opening not taking much space even in a narrow center and facilitating maintenance such as water washing. CONSTITUTION: A connecting port 6 is opened in the peripheral wall of a guide pipe 3, and a concrete feed cylinder 7 is fitted to the connecting port 6. A connecting port 8 communicated with the connecting port 6 at the time of protruding a movable pipe 4 outside of a filling hole 2 and closed at the time of pulling the movable pipe 4 inside the filling port 2 is formed at the peripheral wall of the movable pipe 4. A bottom part 9 for receiving ready-mixed concrete fed into the movable pipe 4 from the concrete feed cylinder 7 through the connecting ports 6, 8 is provided inside the movable pipe 4. The tip opening part 5 of the movable pipe 4 is so formed as to be opened to the outside being communicated with the concrete feed cylinder 7 of the guide pipe 3 when the movable pipe 4 is pulled into the guide pipe 3. The bottom part 9 of the movable pipe 4 is formed to be inclined downward toward the connecting port 8 from the opposite side to the connecting port 8 of the movable pipe 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pouring port attached to a centle (also called steel foam) used for lining concrete on an inner wall surface of an excavated tunnel.

[0002]

2. Description of the Related Art In the construction of placing lining concrete on the inner wall surface of an excavated tunnel, a large movable formwork called "centre" is arranged on the inner wall surface of the inner wall and the outer surface of the center and the inner wall. It is common to pour (pour) concrete between a wall surface and form concrete in an arch shape (lining).

For the above-mentioned lining work, a concrete pouring port B is currently provided at the top end of the center A as shown in FIG. 2, and concrete sent through a pressure-feeding pipe C by a concrete pump (not shown) is used. A “blowing method” in which the space is blown up and filled between the inner wall surface D of the tunnel excavated from the concrete pouring port B and the outer peripheral surface E of the center A is widely adopted. This blowing-up method has an advantage that the concrete in the arch concrete portion above the center is well filled.

As such a concrete pouring port B, conventionally, there are various structures, and one of them is a slide type concrete pouring port as shown in FIG.
A guide pipe G is attached to the inside of the concrete injection port F formed in the center A so as to communicate with the concrete pouring port, and the guide pipe G is slidable inside the guide pipe G by being guided by the pipe G. A movable pipe H is attached to. In the case of this concrete pouring port, the pressure feeding pipe C is attached to the lower end opening J of the movable pipe H.
This pumping pipe C is a scissor pipe in which two pipe pipes K bent in a crank shape are rotatably connected by a bivic joint L so as to follow the vertical movement of the movable pipe H. use. Although not shown, a flexible pipe (or flexible hose) having flexibility may be used as the pressure feeding pipe C.

In the case of this pouring port, when the movable pipe H is pushed up by the hydraulic jack M and the tip of the pipe H is projected upward from the injection port F, the opening N formed on the outer peripheral surface of the tip of the pipe H. Is exposed in the space between the outer peripheral surface E of the center A and the inner wall surface D of the tunnel. At this time, the movable pipe H
When concrete is poured into the same, the concrete will be opened N
When the movable pipe H is accommodated in the guide pipe G, the opening N of the movable pipe H is closed by the inner wall surface of the guide pipe G, and the lid O provided at the tip of the movable pipe H is poured into the concrete pipe. The entrance F is closed flat so that the injected concrete is cured.

[0006]

The casting port device shown in FIG. 3 has the following problems because the pressure feeding pipe C is directly connected to the lower end opening J of the sliding movable pipe H. ． The scissor pipe used as the pressure-feeding pipe C takes time to assemble and is expensive in terms of cost. ． The winding scissor pipe occupies a lot of space and is a hindrance to work in the narrow Centre A. ． Since the scissor pipe has a meandering shape, even if the pouring port is washed with water after pouring the concrete, residual scum of the washed-out concrete will be blocked in the scissor pipe. Therefore, it is usually necessary to remove the scissor pipe from the movable pipe H, but it is very difficult and time-consuming to attach and detach the scissor pipe which has many connecting parts and is heavy. ． Even when a flexible pipe is used as the pressure-feeding pipe C, a certain length of flexible pipe has to be attached in order to allow the movable pipe H to move smoothly, so that space is still taken up. ． When washing the pouring port with water, as with the scissor pipe, the residual dust of concrete is clogged in the flexible pipe, so the pipe must be removed, which is also troublesome.

It is an object of the present invention to provide a concrete pouring port that does not take up much space even in a narrow center and is easy to maintain by washing with water.

[0008]

As shown in FIG. 1, the concrete pouring port according to claim 1 of the present invention communicates with the inside of the concrete pouring port 2 formed in the center 1 to the pouring port 2. Thus, the guide pipe 3 is fixed, a movable pipe 4 which is slidable along the pipe 3 is attached inside the guide pipe 3, and an opening through which the concrete supplied to the movable pipe 4 flows out at the tip of the movable pipe 4. In the concrete pouring port in which the portion 5 is formed, a connection port 6 is opened in the peripheral wall of the guide pipe 3, a concrete supply cylinder 7 is attached to the outside of the connection port 6, and the same is formed in the peripheral wall of the movable pipe 4. When the movable pipe 4 is projected to the outside of the injection hole 2, it communicates with the connecting port 6, and when the movable pipe 4 is pulled inside the injection port 2, it is closed by the peripheral wall surface of the guide pipe 3. A connection port 8 is formed, and a bottom part 9 for receiving fresh concrete supplied from the concrete supply tube 7 through the connection ports 6 and 8 into the movable pipe 4 is provided inside the movable pipe 4. Is.

In the concrete pouring mouth according to the second aspect of the present invention, the tip end opening 5 of the movable pipe 4 is formed so that when the movable pipe 4 is drawn into the guide pipe 3, the opening 5 is formed in the guide pipe 3. It is characterized in that it is communicated with the concrete supply cylinder 7 and is opened to the outside through the concrete supply cylinder 7.

In the concrete pouring port according to the third aspect of the present invention, the bottom portion 9 of the movable pipe 4 is formed so as to be inclined downward from the side opposite to the connection port 8 of the pipe 4 toward the connection port 8. It is characterized by that.

[0011]

In the concrete pouring port according to claim 1 of the present invention, when the tip opening 5 of the movable pipe 4 is projected from the pouring port 2 as shown in FIG.
Of the movable pipe 4 and the connection port 6 of the movable pipe 4 are communicated with each other, whereby the fresh concrete supplied from the concrete pressure-feeding pipe connected to the concrete supply cylinder 7 is connected to the movable pipe 4 through the connection ports 8 and 6. The fresh concrete is supplied and flows out from the tip opening 5 of the pipe 4. Then, when the injection of the fresh concrete is completed, the concrete pump is stopped, the tip opening 5 of the movable pipe 4 is housed in the injection port 2 as shown in FIG. Cure concrete. As described above, at the concrete pouring port, concrete pouring can be performed by connecting the concrete feed pipe 7 provided on the guide pipe 3 to the concrete feed pipe. Therefore, a scissor pipe, a flexible pipe, or the like can be used as the pouring pipe. There is no need to use flexible pipes.

In the concrete pouring mouth according to the second aspect of the present invention, when the movable pipe 4 is pulled into the guide pipe 3, the tip opening 5 of the movable pipe 4 communicates with the concrete supply cylinder 7 of the guide pipe 3. Since it is opened to the outside through the concrete supply cylinder 7, for example, water is sent from the concrete supply cylinder 7 into the movable pipe 4 to wash the inside of the pipe 4, or below the guide pipe 3. Water is sent to the exposed connection port 8 and the pipe 4
You can wash the inside with water.

In the concrete pouring port according to the third aspect of the present invention, the bottom portion 9 of the movable pipe 4 is formed so as to be inclined downward from the side opposite to the connection port 8 of the pipe 4 toward the connection port 8. Therefore, the ready-mixed concrete fed from the concrete supply cylinder 7 can smoothly flow into the movable pipe 4.

[0014]

[Embodiment 1] An embodiment of the concrete pouring port of the present invention will be described with reference to FIG. In FIG. 1, 2 is an injection port for pouring concrete, which is opened at the top of the center 1, 3 is a cylindrical guide pipe fixed to the center 1 so as to communicate with the same injection port 4, 4 is the inside of the guide pipe 3. It is a cylindrical movable pipe that is attached so as to be slidable.

The guide pipe 3 has a substantially oval-shaped connecting port 6 opened in the peripheral wall of the portion protruding toward the inside of the center 1, and a concrete supply cylinder 7 is projectingly provided in the connecting port 6. The concrete supply cylinder 7 is attached at an angle of about 45 degrees obliquely downward with respect to the connection port 6, and a concrete pressure-feeding pipe can be connected to the opening 22 below the supply cylinder 7.

A grease nipple 30 is attached to the outer periphery of the guide pipe 3, and the grease nipple 3
When a grease injector (not shown) is connected to 0 to inject the grease, the grease is injected into the inside of the pipe 3 and the movable pipe 4 mounted inside the guide pipe 3 is smoothly slid. Is done. A desired number of the grease nipples 30 are attached to desired positions on the outer circumference of the guide pipe 3.

The movable pipe 4 has an outer diameter slightly smaller than the inner diameter of the guide pipe 3, and is guided so as to be slidable while being in close contact with the inner peripheral surface of the guide pipe 3. However, in the movable pipe 4, the guide protrusion 20 provided on the outer peripheral surface thereof is provided only along the guide groove 21 formed on the inner peripheral surface of the guide pipe 3 in a straight line along the axial direction of the pipe 3. Since it is movable, the rotation of the pipe 4 is prevented. If the guide pipe 3 and the movable pipe 4 are oval-shaped, square-shaped, or other irregular-shaped pipes, the guide protrusions 20 and the guide grooves 21 are used.
Even if the movable pipe 4 is not provided, the rotation of the movable pipe 4 is prevented, and thus the configuration may be adopted.

A lid plate 23 is attached to the upper end of the movable pipe 4 so as to close the opening surface of the pipe 4. The lid plate 23 has a diameter substantially the same as that of the injection port 2 formed in the center 1, and has a taper portion having a shape capable of closely adhering to the taper portion 24 formed on the edge of the injection port 2 on the peripheral edge. 25 are formed. Therefore, even if the movable pipe 4 is lowered by a hydraulic jack (not shown), the taper portion 25 of the lid plate 23 and the taper portion 24 of the injection port 2 overlap and are locked, and the upper surface of the lid plate 23 is bent. When it is flush with the outer peripheral surface of No. 1 (same plane), it is prevented from descending further. In addition, this lid plate 2
3 may be made larger than the diameter of the injection port 2, but in this case, the lid plate 23 does not fit in the injection port 2, so that after the lid plate 23 is left as a dent on the cast concrete. I will end up.

On the outer peripheral surface of the upper end portion of the movable pipe 4 to which the cover plate 23 is attached, an opening 5 for blowing concrete from the tip of the movable pipe 4 closed by the cover plate 23 is formed. Has been done. As shown in FIG. 1C, the opening 5 is formed in a vertically long slit shape on all sides of the movable pipe 4, and the inside of the pipe 4 is made so that concrete can be smoothly blown out from the opening 5. A triangular rectifying body 26 is provided on the wall surface.

A connecting port 8 having the same shape as the connecting port 6 of the guide pipe 3 is formed on the peripheral wall on the lower end side of the movable pipe 4. This connecting port 8 communicates with the connecting port 6 when the movable pipe 4 is pushed out to a state where the guide protrusion 20 of the movable pipe 4 is locked at the upper end position of the guide groove 21 of the guide pipe 3 and can no longer project (FIG. 1 (b)). 1), the movable pipe 4 is placed in the inlet 2 of the centr 1 so as to be in communication with the connecting port 6 (state of FIG. 1 (a)). However, connection port 8
Even if is disconnected from the connection port 6, the connection port 6 is
Communicates with the opening 5 at the tip of the guide pipe, and the connection port 8 is connected to the guide pipe 3.
It is designed to project downward and open to the outside.
Therefore, if the movable pipe 4 is lowered, water can be sent into the movable pipe 4 through the connection port 6 or the connection port 8 to wash the inside of the pipe 4.

A partition plate 2 is provided at the lower end (bottom portion 9) of the movable pipe 4 to prevent the concrete fed from the connection port 6 to the connection port 8 from leaking to the lower side of the pipe 4.
7 are provided. This partition plate 27 is a guide pipe 3
It is inclined in the same direction as the concrete supply cylinder 7 attached to the connection port 6 of the concrete so that the concrete supplied from the concrete supply cylinder 7 can be smoothly fed into the movable pipe 4. A metal plate 28 is also attached to the upper edge of the partition plate 27 so that the concrete fed from the concrete supply cylinder 7 can smoothly change its direction and be fed to the tip opening 5 of the movable pipe 4.

In addition, two connecting bodies 29 having holes are attached to the lower side of the partition plate 27 of the movable pipe 4,
A hydraulic jack (not shown) can be connected to the connecting body 29.

[0023]

The concrete pouring port of the present invention has the following effects. ． Since the portion of the concrete to which the pressure-feeding pipe is connected is fixed to the center 1 on the side of the guide pipe 3 that does not move, it is not necessary to use a scissor pipe or a flexible pipe for the pressure-feeding pipe. ． Therefore, the piping of the pressure feeding pipe can be made simple without bending, and the piping space in the center can be minimized. ． Since no scissor pipe or flexible pipe is used, the equipment cost can be reduced.

Particularly, the concrete pouring mouth according to the second aspect has the following effects. ． When the movable pipe 4 is pulled into the guide pipe 3, the pipe 4 opens to the outside. For example, water is fed from the concrete supply cylinder 7 into the movable pipe 4 to wash the inside of the pipe 4, or the guide pipe 3 It is possible to wash the inside of the pipe 4 by sending water to the connection port 8 exposed below. ． Further, since a scissor pipe and a flexible hose, which are difficult to handle, are not used, it is easy to replace the water washing hose with the concrete supply cylinder 7, and the water washing can be easily performed.

[Brief description of drawings]

FIG. 1 is an example of a concrete pouring port of the present invention, in which (a) is a cross-sectional view in a state where a movable pipe is lowered,
(B) is sectional drawing in the state which raised the movable pipe, (c) is an AA sectional view in (b).

FIG. 2 is a cross-sectional view showing how lining concrete is cast on the inner wall surface of the arch-shaped tunnel.

FIG. 3 is a conventional example of a concrete pouring port, (a) is a front view of the device, and (b) is a side view of the device.

[Explanation of symbols]

 1 Centr 2 Filling port 3 Guide pipe 4 Movable pipe 5 Opening part 6 Connection port 7 Concrete supply cylinder 8 Connection port 9 Bottom part

Claims (3)

[Claims] 1. A guide pipe (3) is fixed to the inside of a concrete inlet (2) formed in a center (1) so as to communicate with the same, and inside the guide pipe (3). A movable pipe (4) slidable along the pipe (3) is attached, and an opening (5) through which the concrete supplied to the movable pipe (4) flows out is formed at the tip of the movable pipe (4). In the concrete pouring port, the connecting port (6) is provided on the peripheral wall of the guide pipe (3).
, A concrete supply cylinder (7) is attached to the outside of the connection port (6), and the movable pipe (4) is projected to the outside of the injection hole (2) on the peripheral wall of the movable pipe (4). Sometimes, when the movable pipe (4) is communicated with the connection port (6) and the movable pipe (4) is pulled into the inside of the injection port (2), a connection port (8) closed by the peripheral wall surface of the guide pipe (3) is formed, which is movable. Inside the pipe (4), there is provided a bottom portion (9) for receiving fresh concrete supplied from the concrete supply cylinder (7) through the connection ports (6, 8) into the movable pipe (4). Concrete pouring mouth. 2. The concrete supply of the opening (5) of the movable pipe (4) to the guide pipe (3) when the movable pipe (4) is drawn into the guide pipe (3). The concrete pouring port according to claim 1, wherein the concrete pouring port is communicated with the cylinder (7) and is opened to the outside through the concrete supply cylinder (7). 3. The bottom part (9) of the movable pipe (4) is formed so as to be inclined downward from the side opposite to the connection port (8) of the pipe (4) toward the connection port (8). The concrete pouring opening according to claim 1 or 2.