JPS5940999B2 - Pipe burial method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a controlled construction method, and particularly to a controlled construction method applied to burying water and sewerage pipes, etc. in the ground with a large amount of groundwater.

When burying water and sewage pipes underground across roads and railway tracks, a method of burying the pipes without excavating above the ground is to excavate a bit from above the ground across the road, etc., and then bury the pipes from within this pit. The method used is to use a horizontal auger screw to excavate underground and push the pipe forward for burial.

However, when implementing the above-mentioned controlled construction method, there is no particular problem if the ground to be excavated is above the groundwater level and does not contain water, but when excavating ground that contains groundwater and burying the pipe, When excavating with an auger crew, groundwater flows into the casing of the auger crew and into the buried pipe that follows it, causing subsidence of the ground during excavation.

In view of this, the present invention has been made for the purpose of providing a controlled construction method that allows pipes to be easily buried using an auger screw even in ground containing groundwater.

The present invention will be explained below with reference to embodiments shown in the drawings.

The management construction method according to the present invention combines a horizontal excavation auger screw 1 as a horizontal excavation device for horizontally excavating underground, and a vertical screw conveyor 2 as a vertical conveyance device connected to the rear of the auger screw 1. Excavation head 4 of the auger screw 1 rotationally driven by a drive device 3 such as a motor
The earth and sand excavated by the screw blades 1a of the auger screw 1 are conveyed rearward, and delivered to the vertical screw conveyor 2 which is rotationally driven by a drive device 5 such as a motor installed at the upper end, and is transferred to the upper part of the casing 6. The structure is such that rice is discharged onto the ground from an opened soil discharge lower, and a casing 8 is fitted onto the auger screw 1, and a pipe 10 to be buried following the lead pipe 9 is fitted onto the outside.
The rear end of the casing 8 and the lower end of the casing 6 of the vertical screw conveyor 2 are connected in a liquid-tight manner via a connecting device 11, and water is pumped into the casing 6 of the vertical screw conveyor 20 by a pump 12 installed on the ground. The pipe is buried while resisting the water pressure of groundwater that is supplied to the casing 8 and trying to flow into the casing 8, thereby preventing outflow of groundwater and preventing ground subsidence.

The connection device 11 between the casing 8 of the auger screw 1 and the casing 6 of the vertical screw conveyor 20 is a first
As an example of this is shown in FIG. 2 and FIG.
A housing 15 is connected to the front end of 4, and a reduction gear holder 16 is connected to the rear end of the housing 15.

The vertical screw conveyor 20 casing 6 is supported by rails 17, 17 installed on the ground via rollers 18, 18 so as to be movable in the direction of burying the pipes.

The connection device 11 including the reduction gear holder 16, the auger screw driving motor 3, and the pushing jack 19 are mounted on a base 20 installed at the bottom of the pit 13, and the jack 1
The entire conveyor including the vertical screw conveyor 2 is pushed forward by the pushing force of 9.

Inside the housing 14, an inner cylinder 21 is provided which connects the casing 8 of the auger screw 1 and the casing 6 of the vertical screw conveyor 2.
An intermediate shaft 22 connected to the shaft end is inserted, and this intermediate shaft 2
The rear end of 2 is connected to the output shaft of the speed reducer in the speed reduction holder 16.

An injection port 23 for injecting a coagulant is opened in the cylindrical body 15 at the front of the casing 14, so that the rear end of the casing 8 can be closed by injecting the coagulant at any time.

Next, a construction example of the construction method of the present invention will be explained with reference to FIGS. 3A to 3F.

First, as shown in FIG.
A base 20 is installed at the inner bottom, and the auger screw 1 and the vertical screw conveyor 2 are installed, and the casing 8 of the auger screw 1 and the buried pipe 10 are connected to the connecting device 11 at the lower end. Connect tightly (Figure 3B).

In this way, water is injected into the casing 6 of the vertical screw conveyor 2, water pressure is applied to the casing 8 of the auger screw 1, and the drive motor 3 and jack 19 are driven to excavate and push the ground.

When the above-mentioned auger crew 1 and buried pipe 10 are almost completely buried underground, a coagulant is injected between the rear end of the auger crew 1 and its casing 8 and the connecting device 11 to stop water. This is separated, and the connecting device 11 is pulled back together with the vertical screw conveyor 2, and the intermediate auger screw 1 and the buried pipe 1 are placed between them as shown in FIG. 3C.
0 is suspended, connected, and the excavation is continued in the same manner until it penetrates into the pit 13' on the other side as shown in FIG. 3D-F.

If the buried pipe 10 penetrates between the two pipes 13 and 13', there will be no outflow of underground water, so the auger screw 1 can be removed without stopping the water.

In the construction method of the present invention described above, the groundwater flowing into the casing of the auger screw during excavation is resisted by the water pressure supplied into the casing of the vertical screw conveyor as a vertical conveyance device, and the pipe is piped while preventing groundwater from flowing out. There is no risk of ground subsidence due to diversion of groundwater (therefore, work can be carried out safely even under roads or railway tracks).

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the main part of the equipment used to implement the method of the present invention, Fig. 2 is a front view thereof, and Fig. 3 A-F are explanatory diagrams showing the steps of the method of the present invention. . 1... Auger screw, 2... Vertical screw conveyor, 3, 5... Motor, 4...
...Drilling head, 6,8...Casing, 7...Earth discharge port, 9...Leading pipe, 10
... Buried pipe, 11 ... Connection device, 12
...Pump, 13...Pit, 14.
...Housing, 16...Reduction gear holder, 17
...Rail, 18...Roller, 19.
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・Inner cylinder, 22...Intermediate shaft.

Claims (1)

[Claims] 1 The casing of a horizontal drilling device that excavates the ground horizontally from within the bit drilled on the ground surface, and the casing of a vertical conveyance device that is movable in the longitudinal direction within the pit and transports the excavated soil to the ground, are made liquid-tight. The pipe is connected to the casing of the vertical conveyance equipment and supplied with water to withstand the water pressure of groundwater flowing into the casing of the horizontal excavation equipment, thereby preventing the subsidence of the excavated ground while pushing the underground pipe and burying it. Characteristic managed construction method.