JPS6020540B2 - High head concrete supply method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-head concrete supply method for transporting materials such as concrete or mortar from high places to low places, especially in civil engineering works, by sending the material from above ground to deep underground with a high head. It is.

Conventionally, when constructing pressure iron conduits, underground tunnels, vertical shafts, etc. for underground power plants and hydroelectric power plants, concrete was conveyed through high heads by raising and lowering buckets, or by laying steel pipes to convey the concrete by its own weight. There is a method of dropping it, but this causes deterioration of the concrete mix due to separation and scattering of concrete and mortar materials, and there are limits to the scale of equipment and construction capacity.

Furthermore, noise during falling concrete, shock during falling, wear of steel pipes, etc. are generated, and the working environment and safety aspects are not satisfactory. In addition, a shock absorbing device has been provided as an improvement to this self-weight drop method, but this is also insufficient in its effectiveness and cannot fully eliminate the above-mentioned drawbacks.

The present invention was developed to completely eliminate these drawbacks, and in particular, a rotary feeder is provided at the discharge port of the steel pipe, and the steel pipe is constantly filled with concrete. , the rotation speed of the rotary feeder is set so that the flow velocity in the pipe is higher than the sedimentation separation limit value of sand, cement, and water, and concrete is supplied under a high head. When stopping temporarily, valves provided at predetermined intervals within a range that does not cause sedimentation and separation of concrete and blockage in the pipe are closed to block the flow path.

This will be explained using the illustration.

1G is a concrete transport vehicle that operates above ground, and 2 is an underground concrete transport vehicle.

7' This is a concrete supply pipe laid with a height difference between the above ground and underground tunnel, and is made of steel pipe.

A charging hopper 3 is provided at the upper end of the tube 7. Reference numeral 4 denotes an opening/closing valve for the hopper, which closes the lower entrance of the input hopper 3 in an airtight manner as shown in FIG. It is something that can be done.

8, 8... are valves installed at appropriate intervals in the supply pipe 7, and the intervals are within the permissible separation range of the concrete in the supply pipe 7, and the settling of the concrete in the supply pipe 7 and the pipe It is set within a range that does not cause road blockage.

8' is a flexible valve leaflet of the valve 8, and 8'' is its valve body.

7a, 7b indicate sections divided by valves 8, 8, . . . 1 is a source of compressed air, and the compressed air is passed through a conduit 1
1, the valve body 8^ of the valve 8 and the flexible valve leaflet 8'
and closes the flow of the supply pipe 7.

12 is a compressed air switching valve.

9 is a rotary leaf feeder installed at the lower discharge port of the supply V supply pipe 7, and 11' is a compressed air injection pipe closed at the upper part of the rotary leaf feeder 9, which injects compressed air into the supply pipe 7 by operating the injection valve 13. The concrete is sprayed to remove concrete that has settled and separated, and to remove blockages in pipes, allowing the concrete to flow smoothly.

This compressed air injection pipe 11' can also be provided at any other point in the pipe network of the supply pipe 7.

Further, a rotary feeder 9 is also provided toward the hopper 3, and a rotary feeder 9 is provided at the outlet of the supply pipe 7.
It is also possible to supply concrete smoothly by rotating it in synchronization with 9.

In supplying concrete to a high head, the present invention has the following features:
By operating the supply pipe 7 and the rotary feeder 9 at the lower discharge port, the supply pipe 7 is first filled with concrete, and then the concrete is mixed with aggregate, sand, cement, and water according to the sedimentation separation limit value. The rotational speed of the rotary feeder 9 is set to achieve a high flow velocity in the pipe, and concrete is sequentially supplied downstream.

In addition, when temporarily stopping concrete supply due to replacing the underground concrete transport vehicle 2 underground, close the on-off valve 4 of the input hopper 3 and stop the rotation of the rotary feeder 9, and at the same time use compressed air. Using the switching valve 12 as a barrier, compressed air is sent from the compressed air source 10 to the valve 8, and the flexible valve membrane 8' is inflated to close the pipe structure and make the sections 7a and Tb between the valves 8 and 8 airtight. This will prevent deterioration due to sedimentation and separation of concrete in the same section and prevent blockage within the pipe rock.

In addition, when the concrete is hit diagonally by the rotation of the rotary feeder 9, compressed air is injected from the injection pipe 11' using the injection valve 13 above the feeder as necessary. According to the present invention, there is no shock caused by falling concrete when the concrete is hit by a carp at a high drop, and therefore no vibrations are generated. There is also less wear on the supply tube.

In addition, there is no risk of separation of the concrete mix or blockage of pipes, unlike in the case of conventional dead weight falls.
Concrete quality control is stable and improved.

If the concrete mix changes, this can be dealt with by setting the rotational speed of the rotary leaf feeder appropriately, so there is no need to change the equipment, and no matter how the head changes or whether it is vertical or Even if there is a law, it can be enforced even if it is complicated.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the entire device, Figure 2 is a vertical cross-sectional view of the input hopper when the concrete supply is stopped, Figure 3 is a vertical cross-sectional view of the concrete discharge port of the steel pipe, and Figure 4 is a vertical cross-sectional view of the concrete discharge port of the steel pipe. FIG. 5 is a longitudinal sectional side view of the entire embodiment, and FIG. 5 is a longitudinal sectional side view of the discharge port thereof. 2...Inner concrete transport vehicle, 3...
・Input hopper, 7... Concrete supply pipe, 8
...Valve, 9...Rotary leaf feeder. Sa figure fang 2 figure Kiwo wind float A figure buhen GO

Claims (1)

[Claims] 1 Concrete is introduced through the input hopper installed at the top of the concrete supply pipe laid with a high head, and the concrete is filled up to the rotary feeder installed at the lower discharge port of the pipe, and then concrete is input sequentially from the input hopper. Then, the rotary feeder is rotated so that the flow velocity in the pipe is higher than the sedimentation separation limit value of the aggregate, sand, cement, and water mixed in the concrete, and the feeder is supplied to the underground concrete truck, etc., and when the truck is replaced. When temporarily stopping the supply of concrete for reasons such as this, the flow path is closed by closing valves installed at specified intervals in the supply pipe within a range that does not cause sedimentation and separation of concrete and blockage within the pipe. Concrete supply method.