JPS60215993A - Method and apparatus for embedding small diameter pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a small diameter management installation method and apparatus.

Traditionally, small-diameter pipes used for water, sewage, gas, electrical lines, etc.
It was common practice to dig a trench in the ground, construct the design there, cover it with soil, etc., and bury it. However, depending on the construction site, it may not be possible to dig trenches in the ground for reasons such as disturbing the living environment. Ma.

In addition, if traffic obstruction is significant, construction work will be severely restricted. Furthermore, the impact on the surrounding ground and structures on the ground must be considered, and conventional techniques for burying small-diameter pipes have a number of drawbacks.

For this reason, construction methods have been developed to bury small-diameter pipes such as water and sewage pipes and protection pipes for various cables underground, without excavating above ground, across roads, railway tracks, and other areas. A construction method has been implemented in which a T4 is excavated from the ground across a road, etc., and a small diameter pipe is pushed and buried while excavating underground using a horizontal screw competition A7 horizontal excavation device from inside this hard pile. Ta.

However, with the conventional small diameter management construction method.

If the excavated ground is above the groundwater level and does not contain water, no special problems will occur. When excavating with a horizontal excavation device, groundwater flows into the casing of the horizontal excavation device and into the shed, causing the ground to sink and sink during excavation, which is a major drawback.

Therefore, according to Japanese Patent Application Laid-open No. 58-65897,
In a managed construction method in which the casing of a horizontal excavation equipment and a tank for discharged soil are connected in fluid communication and horizontal excavation and buried pipes are pushed and buried while counteracting the water pressure of groundwater flowing into the casing, the tank for discharged soil is installed on the ground, and the excavated soil and water in the casing are sent from the slurry pump Nyori casing installed in the stand to the soil drainage tank, and the pumped soil and water are discharged in an amount equivalent to 1c of excavated soil and water. Management characterized by horizontal excavation while returning the liquid in the soil tank to the ground using a water return pump provided in the tank, and circulating a portion of the returned water to the soil intake channel provided in the tank. Construction methods have been proposed.

However, in this type of hydraulically balanced small-diameter management construction method, water pressure is maintained in all the buried pipes during pushing and burying, but when connecting the buried pipes, water pressure is maintained only at the tip of the leading pipe. Only. Therefore, there is a drawback that water in the subsequent pipes flows out each time each subsequent pipe is connected. .

It is an object of the present invention to overcome these drawbacks of the prior art and to provide a small diameter management installation method and device that prevent water from flowing out around a screw conveyor when connecting a subsequent pipe.

The process involves using a propulsion platform to propel a leading pipe and multiple trailing pipes in the direction of a predetermined planned line underground, and then transporting the excavated soil at the tip of the leading pipe to the leading pipe and trailing pipes. In a hydraulically balanced small-diameter management installation method that maintains water pressure around the screw conveyor when conveying backwards by a screw conveyor installed inside, when each subsequent pipe is connected, all subsequent pipes already underground and the previous pipe are connected. The second invention is directed to a small diameter management installation method characterized by maintaining the water pressure around the screw conveyor of the conduit with water stop blades, and the gist of the second invention is to install a lead pipe in the direction of a predetermined planned line underground. When multiple trailing pipes are propelled by a propulsion platform, and the excavated soil at the tip of the leading pipe is transported backwards by a screw conveyor, the soil excavated at the tip of the leading pipe is conveyed backward by the screw conveyor. In a small-diameter management equipment designed to maintain a water pressure of The small diameter management installation device is characterized in that the water stop blade is opened and closed by rotating the water stop blade.

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, an outline of the basic principle of the small diameter management and installation device according to the present invention will be explained with reference to FIGS. 1 to 3.

First, a starting shaft 2 and an arrival shaft 3 are dug in the ground 1.

A small diameter pipe is buried between these two shafts 2.3. A propulsion platform 4 is provided in the starting shaft 2. After accurately determining the propulsion direction of the propulsion platform 4, the propulsion of the guide pipe 5 having approximately the same outer diameter as the small diameter pipe to be buried is started. Once the leading pipe 5 has been propelled to a predetermined point, a trailing pipe 6 (in the example shown in FIGS. 1 to 3, a small diameter pipe for burial) is added. The soil pushed by the blade 5a of the leading pipe 5 enters the inside from the tip of the leading pipe 5, is carried by the screw conveyor 7 through the leading pipe 5 and the trailing pipe 6, and comes out to the starting shaft 2. .

When using the guide tube 17 (FIG. 10), the guide tube 5
When it reaches the reaching shaft 3, the small-diameter buried pipe is connected to the last guide pipe 17 and propulsion continues. At that time, the guide pipes 17 coming out one after another are collected in the reaching shaft 3. If such operations are continued, the entire guide tube 17 will be finally replaced by the small diameter tube 6 for burial.

In this invention, when connecting each subsequent pipe 6, whether the subsequent pipe 6 is a small diameter pipe for burial or a guide pipe,
The water pressure around the screw conveyor 7 of the leading pipe 5 and the trailing pipe 6, which are already underground, is maintained by the water stop blades 10.

When performing construction in places with a high groundwater level H or in sandy layers, the water pressure in the screw conveyor cylinders 8 of the underground leading pipe 5 and trailing pipe 6 must be maintained in order to prevent the tip cutting edge of the leading pipe 5 from collapsing. However, in this invention, the water pressure is maintained by the water stop blades 10, so as shown in FIG. The water stop blades 10 are rotatably arranged radially at one end of the shaft 11. The screw conveyor 7, as best shown in FIG. 5, is constructed with a male portion 11a at one end and a female portion 11b at the other end, and comprises a series of screw conveyors which may connect the male portion 11a to the female portion 11b. 7. A water stop blade installation part 110 with a hexagonal cross section is installed near the male part 11a of the screw conveyor shaft 11.
is formed. In the illustrated example, six blades 10.a are attached to the shaft 10b in this water stop blade installation portion 11C.

Each shaft 10b extends in the radial direction, and each blade 10a can rotate around the shaft 10b, and the shaft 1Ωb
It is possible to move in the radial direction along the

A stop member 13 is fixed near one end of the screw conveyor tube 8 corresponding to the installation position of the water stop blade 10.

In the illustrated example, the stop member 13 is approximately ring-shaped and is made of a wear-resistant and elastic material, such as hard rubber. An inclined surface 13a is formed inside the stop member 13. Axis 1 of screw conveyor 7
1 to the right in Fig. 4, each blade 10a
The tip of the blade engages with the inclined surface 1'3a of the stop member 13, and when the shaft 11 is further moved, all the blades 10a are closed.

Figures 6 and 7 show a state in which all the blades 10a are open, and Figures 8 and 9 show a state in which all blades 10a are closed, moving the screw conveyor's shaft 11 forward (that is, leading pipe 5), each blade 10a is forcibly opened by the pressure of the soil discharge inside the cylinder 8, and as a result, the soil can be discharged.

By the way, in the example shown in FIG. 4, a small diameter pipe for burial (
For example, a humid pipe (not shown in FIG. 4) is used, and the flange 15 provided at one end of the screw conveyor pipe 8 of the small diameter pipe 6 for burial and the leading pipe 5 are used. A flange 16 provided at the rear end of the screw conveyor A cylinder 8 is connected with a bolt 17. Connection of the screw conveyor cylinder 8 of each subsequent pipe 6 is similarly performed by fixing the flanges with bolts.

FIG. 10 shows an example in which a guide pipe 17 is used as the trailing pipe 6. The structure and operation of the screw conveyor 7 and the water stop blades 10 attached thereto are exactly the same as in the example shown in FIG. 4. The screw conveyor tube 8 of the guide tube 17 has substantially the same function as the screw conveyor tube 8 of the example shown in FIG. The way they are connected is different from the example shown in FIG. 4, in that they are simply brought into contact with each other and a sealing material 19 is interposed therebetween.

In addition, in FIGS. 1 to 3, 20 is a water pressure balance device, which is connected to the ends of the leading pipe 5 and the trailing pipe 6 so as to be able to maintain the rear end of the screw conveyor cylinder 8 in a watertight state. It has become. This water pressure balance device 20
A shaft 21 is rotatably provided inside the shaft 21.
One end is adapted to be detachably connected to the shaft 11 of the screw conveyor 7. This water pressure balance device 20
The other end of the shaft 21 is connected to a rotational drive mechanism provided inside a drive device 22. Further, the hydraulic balance device 20 is connected to a discharge box 23, and the discharge box 23 is connected to a vibrating blue 27 via a valve 25 and a pump 26. A settling tank 28 is provided below the vibrating blue 27. This sedimentation tank 28 is connected to the aforementioned water pressure balance device 20 via a pump 29 and a valve 3.0. Further, the pipe 31 is connected between the valve 30 and the pump 29 and between the valve 25 and the pump 26, bypassing the water pressure balance device 2.0 and the soil removal box 23,
A valve 32 is provided in the middle.

How to use the above-mentioned small diameter management equipment will be explained.

The propulsion platform 4 is installed inside the shaft 2, the hydraulic bounce device 20 and the leading pipe 5 are connected, and instruments such as the earth removal box 23, pump 26.29, valves 25.30.32, etc. (not shown) are installed. ). Thereafter, the driving device 22 is activated to start digging into the leading pipe 5, and the water pressure balance device 20 is filled with water to a predetermined water pressure. , the leading pipe 5 excavates while maintaining the water pressure inside the screw conveyor tube 8 constant. At this time, the water stop blade 10 is in an open state as shown in FIGS. 6 and 7. In the water pressure balance device 20, the water sent by the pump 29 through the valve 30 is sent to the soil removal box 23, and at this time, the waste soil is also sent together.

When the leading pipe 5 is dug to a predetermined position, the driving device 22
J: Move the risk screw conveyor 7 backward. As a result, the water cutoff blade 10 is brought into a closed state as shown in FIGS. 8 and 9, and water is cut off. Thereafter, the trailing pipe 6 is connected to the end of the leading pipe 5, and the shafts 11 of the screw conveyor 7 are connected to each other. Furthermore, after properly connecting the water pressure balance device 20 and the trailing pipe 6, the drive device @22
The propulsion work will be carried out again.

After that, propulsion is performed while sequentially connecting the succeeding pipes 6 to each other.

FIG. 1 shows a state where a propulsion operation is being performed with a large number of trailing tubes 6 connected together. At this time, valve 32 is closed and valves 30 and 25 are open. Therefore, the water sent from the sedimentation tank 28 by the pump 29 flows through the hydraulic balance device 20 to the earth removal box 23, and at this time, the earth is fed into the earth removal box 23. The amount of water sent to the water pressure balance device 20 is based on the water head depending on the depth of the shaft 2.3, pump 26.29 and valve 25.30.32.
control. After the waste soil is filtered by the filter 24, the water is sent by the pump 26 and falls into the vibrating sieve 27, and further reaches the settling tank 28.

FIG. 2 shows a state in which the water stop blade 10 is closed after the leading pipe 5 and the plurality of trailing pipes 6 are sufficiently propelled. After closing the water cutoff vane 10, the valve 30 is closed and the valve 32 is opened, and the water sent by the pump 29 flows through the pipe 31 and bypasses the water pressure balance device 20 and the earth removal box 23.

Figure 3 shows the driving device 2 with the water stop blade 10 closed.
2 and the hydraulic balance device 20 are moved to the left, and a new trailing pipe 6 is to be installed between the trailing pipe 6 in the ground and the hydraulic balancing device 20. Even in this state, the water sent by the pump 29 flows through the pipe 31, and since the water pressure balance device 2 or more is configured, the screw conveyor , around -' (inside the cylinder 8 in the illustrated example)
Not only is the water pressure maintained, but also the water pressure around the screw conveyor (inside the tube 8) is reliably maintained when each subsequent pipe 6 is connected. Therefore, not only can the collapse of the face be prevented, but also the surroundings of each screw conveyor (inside the tube 8)
The subsequent pipe 6 can be connected without causing water to flow out, which is extremely effective in terms of work efficiency.

Further, by knowing the position of the screw conveyor shaft 11, it is possible to confirm whether the water stop blade 10 is in an open state or a closed state.

Note that it is preferable that the soil removal box 23 can be replaced with a new one as needed.

Instead, it can also be applied to a hydraulically balanced controlled construction method as described in, for example, Japanese Unexamined Patent Publication No. 58-65897.

2'11f! ! l :,, :i :rEA <*Explanatory diagram showing a series of states of the small diameter management setting method according to the present invention,
FIG. 4 is a schematic sectional view showing the related structure of the water stop blade of the small diameter management equipment according to the present invention, FIG. 5 is a front view showing an example of a screw conveyor, and FIGS. 6 and 7 are open views of the water stop blade. FIG. 8 and FIG. 9 are diagrams showing the closed state of the water stop blade, and FIG. 10 is a schematic sectional view of the small diameter management installation according to the present invention.

5... Leading pipe 6...Subsequent pipe 7...Screw conveyor 8...Cylinder for screw conveyor 10...Water stop blade 13...stop member 20...Water pressure balance device 22... Drive equipment 23..., earth removal box 27... Vibration sieve 28, Sedimentation tank Agent Patent Attorney Tanabe Figure 7

Claims (2)

[Claims] (1) A propulsion platform propels a leading pipe and a plurality of trailing pipes in the direction of a predetermined planned line underground, and
In a hydraulically balanced small-diameter management installation method that maintains water pressure around the screw conveyor when the excavated soil excavated at the tip of the leading pipe is conveyed backward by the screw conveyor installed in the leading pipe and the trailing pipe, each succeeding pipe is When connecting pipes,
A small diameter management installation method characterized by maintaining the water pressure around the screw conveyor of all trailing pipes and leading pipes already underground using water stop blades. (2) A propulsion platform propels a leading pipe and a plurality of subsequent pipes in the direction of a predetermined planned line underground, and
A small-diameter management equipment that maintains water pressure around the screw conveyor when excavated soil at the tip of the leading pipe is conveyed backward by the screw conveyor installed in the leading pipe and the trailing pipe. A water stop blade is rotatably arranged at one end of the screw conveyor shaft of each of the succeeding pipes, and by moving the screw conveyor shaft in the axial direction, the water stop blade is rotated to open and close. Small diameter management equipment.