JPS5939038B2 - Underwater propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for burying a pipe body in water-containing ground with a lot of groundwater by a propulsion construction method or a shield construction method,
In particular, it was invented as a propulsion method or a shield method to safely and efficiently propulsion and bury underwater without pumping up water in the ground at all, and without soil improvement by using chemical injection method etc. In ancient times, a plurality of shelves with an appropriate depth were installed horizontally or sloped slightly downward in the propulsion direction from the tip of the blade to the rear of the tube.
A closing plate having a rotating shaft is installed at the rear end of each shelf, and a watertight bulkhead that closes off the entire cross section of the pipe body is installed at an appropriate rear position, and a wall near the propulsion shaft is installed on the top of the bulkhead. A water pipe is installed to communicate with the installed water tank and to apply the required water pressure between the blocking plate and the partition wall.

On the other hand, a pipe that opens at the bottom of the partition wall and is slanted toward the rear of the pipe body is provided, and a soil scraping device is installed inside the pipe, and the end of the pipe is bent vertically to provide a watertight opening/closing valve. It is constructed by setting it up and opening it.

Next, the Toropacket is positioned and fixed in a watertight manner at the lower opening of the valve, which matches the opening shape of the Toropacket having an upper opening.

With the watertight opening/closing valve open, the earth and sand taken into the pipe body by the propulsion of the pipe body are scraped up underwater along a pipe installed at the bottom of the bulkhead and removed from the vertical end of the pipe. The soil is dropped downward and deposited in the Toropacket through the opening/closing valve, and then the scooping up of the soil is stopped, the opening/closing valve is closed, and the settlement of the Toropacket is released to trap the earth and sand in the Toropacket and the pipe body Underwater propulsion method used for shield method or propulsion method, which is characterized by successively propelling the pipe body by repeating the operation of taking it out to the outside (work below the conventional water level in the conventional ground) The propulsion work in which the excavation of the face is stabilized by applying water pressure equal to or higher than the conventional water pressure in the water pressure chamber 5 after taking in the water is hereinafter simply referred to as underwater propulsion.

). Conventionally, when using this type of construction method to move through water-containing ground with a lot of groundwater, the inside of the pipe was purposely submerged in water, as in the technique of JP-A-51-56518, in order to prevent groundwater from flowing into the inside of the pipe. Although it is widely known that it is extremely safe to carry out propulsion work under such conditions, there is no method that can be economically implemented as a practical method.

The present invention provides a practical method that can most economically carry out underwater propulsion as described above, and has features that it can be manufactured at low cost with an extremely simple structure, and can be carried out safely and reliably.

Next, one embodiment of the present invention is shown in FIGS. 1 and 2 and will be described in detail.

The cutting edge portion 1, which is layered at the tip of the propulsion tube 20, is provided with a plurality of shelves 2 that are horizontally or slightly lowered at the rear of the tip of the cutting edge. ...bin 4 at the rear end
A closing plate 3, which rotates freely around an axis, is attached.

The closing plates 3 are opened and closed depending on the water pressure from the front and the water pressure in the water pressure chamber 5.

It should be noted that, if necessary, the closing plates 3... may be provided with special cones 3-1,..., or they may be forcibly opened and closed manually or automatically.

In this way, first, when the tube body 20... is forcibly propelled into the ground in front by the propulsion hydraulic jack 27, the blocking plate 3... is particularly affected by the earth pressure and water pressure from the front. Due to the increase in pressure, the pipe becomes open, and therefore, the dirt 25 in front flows into the water pressure chamber 5 from between the shelves 2 . . . and the blocking plates 3 .

When the propulsion of the tube bodies 20... is stopped, the water pressure in the water pressure chamber 5 increases due to the water pressure from the water supply vibro, so the blocking plate 3... acts to close, thus preventing the intrusion of the earth and sand 25 at the front. It will be pressed down automatically.

On the other hand, since the water level 9 of the water tank γ with which the water supply vibro communicates is set higher than the water level 10 in the ground, this water pressure difference is applied excessively to the water pressure chamber 5.

Next, a raking device 12 for the earth and sand 23 is provided in a pipe 11 with an inclined bottom provided at the lower part of the partition wall 22, and when this raking device 12 is driven, the earth and sand 23 are removed by a raking plate 30... • is scraped up along the bottom of the pipe 11 and reaches the rear end 13 of the pipe 11.

Note that this scraping method is not necessarily limited to the device according to the first embodiment, and other devices such as a screw conveyor may also be used.

The earth and sand that has reached the rear end 13 of the pipe 11 falls along the vertical pipe 14 provided at the rear end.

On the other hand, since the upper opening of the tropacket 18 has the same shape and size as the lower opening 16 of the watertight opening/closing valve 15 attached to the lower part of the pipe 14, Both openings are in close contact with each other with a sealing material 17 interposed therebetween.

Therefore, if the valve 15 is kept open, the earth and sand 24 will pass through it and be deposited in the tropacket 18.

Now, as an example, a lifting jack 19.19 is used to bring the two openings into close contact with each other, but a flexible lever (not shown) is also provided in the lower opening 16 to tighten the opening of the tropacket 18. It is also easy to adopt a method in which the parts are brought into close contact with each other.

In this way, when the sediment 24 has been sufficiently deposited inside the Toropacket 18, the drive of the raking device 12 is stopped, and when the valve 15 is closed in this state, the inside of the hydraulic chamber 5 and the Toropacket 18 are removed. The water flow is completely blocked.

Then, the lifting jack 19 is lowered, the crimping of the Tropacket 18 is released, and the Tropacket 18 is transported outside the tube.

After doing the above, repeat the above operation again to adjust the water pressure; Chamber 5
The accumulated soil 23 inside is carried out to the outside.

Once the accumulated soil 23 has been sufficiently removed, the pipe body 20 and
By forcibly propelling ... into the front ground with a hydraulic jack 21, the front earth and sand 25 to be discharged is transferred to the hydraulic chamber 5.
taken within.

At this time, while the earth and sand 23 are being discharged from the water pressure chamber 5 through the pipe 11, the inside of the water pressure chamber 5 is kept safe from the earth and sand 25 in front due to the water pressure difference, as described above. .

By repeating the above operations, the construction method of the present invention □ can completely prevent the excessive inflow of front earth and sand into the inside of the pipe and collapse, without pumping up any groundwater, and the structure of the pipe can be completely prevented. Due to its very simple structure, it can be manufactured very economically, and the pipe bodies can be safely and reliably propelled and buried in the ground one after another, making it very efficient.

[Brief explanation of the drawing]

FIG. 1 is a general longitudinal explanatory diagram showing one embodiment of the present invention. FIG. 2 is a view taken along the line 1-1 in FIG. In the figure, 1-1 is the inside of the slope of the cutting edge 1, 2 is the shelf, 3 is the blocking plate, 4 is the bottle structure, 5 is the water pressure chamber, 6 is the water pipe, 7 is the water tank, and 12 is the soil scraper. 15 is a watertight opening/closing valve, 26 is a hydraulic jack, 28 is a base concrete, and 29 is a bearing wall.

Claims (1)

[Scope of Claims] 1. A plurality of shelves having an appropriate depth from the tip of the cutting edge or at the rear of the barrel body are provided horizontally or are inclined slightly downward in the direction of propulsion, and the rear end of each shelf is A blocking plate having a rotating shaft is provided, and a watertight bulkhead is provided at an appropriate rear position to close the entire cross section of the pipe, and the upper part of the bulkhead is connected to a water tank installed near the propulsion shaft. A water pipe is installed to provide the required water pressure between the On the other hand, an inclined pipe that opens at the bottom of the partition wall is provided toward the rear of the pipe body, and an earth and sand scooping device is installed inside the pipe, and the end of the pipe is bent vertically to form a watertight opening/closing system. A valve is provided and opened. Next, the tropacket is positioned and fixed in a watertight manner at the lower opening of the valve, which matches the opening shape of the trobat which has an upper opening. Next, the sediment taken into the pipe body by the propulsion of the pipe body is scraped up underwater along the pipe installed at the bottom of the bulkhead with the honey-type opening/closing valve open and downward from the vertical end of the pipe. It is deposited in the tropacket through an on-off valve. After that, the operation of stopping scooping up the earth and sand, closing the opening/closing knob 4, opening the fixation of the Toropacket, trapping the earth and sand in the Toropacket, and taking it out to the outside of the pipe body is repeated. An underwater propulsion method used for the shield method or propulsion method, which is characterized by sequential propulsion.