JPS594025B2 - Lead pipe for propulsion method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lead pipe for a propulsion method.

BACKGROUND ART A propulsion method in which a buried pipe is formed by pressing the rear end of a pipe with a hydraulic jack to push the pipe into the ground and propel it has become widely used in recent years.

However, in conventional propulsion construction methods, the rear end of the last propulsion tube pushed into the ground is pushed in with a hydraulic jack, or even if an intermediate jack is installed in the middle of the propulsion tube, a propulsion tube row of a predetermined length that can be pushed in is used. A propulsion jack is installed at the rear end to propel it.

However, when constructing on soft or non-self-supporting ground, or when using larger-diameter propulsion pipes, although the leading pipe and propulsion pipe are naturally held in place in the ground, As shown in Figure 2, the leading tube and the propulsion tube are not reliably held in that position, so if the leading tube and the propulsion tube are propelled together by a pushing force from behind in that state, they tend to be easily displaced.

The purpose of the present invention is to provide a lead pipe for a propulsion method that allows propulsion work to be carried out accurately without soil improvement even under such adverse conditions. and a main body that is fitted and held so as to be relatively movable in the axial direction,
A plurality of jacks are interposed between the rear end of the leading part and the main body for moving the leading part to protrude relative to the main body, and a pair of spherical door bodies are each provided in the leading part in the vicinity of the tuyere. The main body portion is provided with a continuous door body capable of forming a chamber between the main body portion and the door body.

One embodiment will be described below based on the drawings.

In FIGS. 1 to 3, 1 is a leading pipe, and 2 is a leading propulsion pipe connected to the rear end of the leading pipe 1. In FIG.

The leading pipe 1 consists of a leading part 3 and a main body part 4 that fits and holds the leading part 3 so as to be relatively movable in the axial direction.
A tuyere 5 is formed at the tip, and a propulsion tube connecting portion 6 is formed at the rear end of the main body 4.

Further, the main body part 4 includes an inner cylinder 1, an outer cylinder 8, and the connecting part 6.
As a result, a bottomed annular space 9 is formed inside the annular space 9, into which the rear part of the leading part 3 is slidably fitted as described above, and between the rear end of the leading part 3 and the bottom surface of the annular space. A plurality of jacks 10 are interposed therein for moving the leading portion 3 in a protruding manner relative to the main body portion 4.

On the other hand, the leading part 3 also has a double-walled structure consisting of an inner cylinder 11 and an outer cylinder 12, and an annular space 13 is formed inside. A pair of door bodies 14a and 14b are provided which can swing open and close between a position in which the tuyere opening is closed by pushing out toward the axis, and a position in which the tuyere opening is retracted into the annular space 13 as shown by the imaginary line in FIG. It is being

The pair of door bodies 14a and 14b each have a spherical shape, are located on a straight line passing through the center of the spherical surface, and are swingably supported by a rotary drive unit 15 disposed within the annular space 13.

16 is H4a in the above J%. In order to connect the opposing edges in a sealed state when 14b is in the closed position,
This is an arc-shaped connector installed in the inner cylinder 11 in the diametrical direction.

Reference numeral 17 denotes an openable and closable continuous door body disposed at the tip of the inner cylinder I of the main body 4, and a chamber 18 can be formed between the door bodies 14a, 14b and this continuous door body 17. .

The detailed structure will be explained with reference to FIGS. 4 to 6. As shown in FIG. 4, a sealing rubber 19 is provided in the inner tube 11 penetrating portion of the door bodies 14a, 14b to keep the annular space 13 watertight. ing.

As shown in FIGS. 4 and 5, the connecting device 16 has a pointed protrusion 20 formed on the tip side to reduce unnecessary resistance caused by the connecting device 16 during propulsion, and also to function as a cutter. It is.

In addition, the portions facing the edges of the door bodies 14a, 14b are provided with openings 21 through which these edges penetrate, and a pair of sealing rubber plates 22 are provided which press against the inner and outer surfaces of the door bodies 14a, 14b from both sides of the opening 21, respectively. is extended, and at the back of the opening 21 is a sealing plate 23 with which the edges of the door bodies 14a and 14b come into contact.
is provided.

When the door bodies 9a, 9b are in the face opening closed position, the ends of the door bodies 14a, 14b push and bend the pair of rubber plates 22 and penetrate into the opening 21, as shown in FIG. It comes into contact with the plate 23 and is completely sealed.

When the door bodies 14a, 14b are rotated toward the open position, the openings 21 after the door bodies 14a, 14b have escaped are closed by the pair of rubber plates 22, as shown in FIG. This prevents foreign substances from entering and preventing a perfect seal.

24 is a cleaning opening, and 25 is a cover plate thereof. Further, as the details of the rotary drive unit 15 are shown in FIG. 6, the inner cylinder 11 of the front part 3 is provided with a door body 14a.

A hydraulic motor 26 for driving the rotation of 14b is attached, and one end of one door body 14a is fixed to the output shaft 21 of the hydraulic motor 26, and the other end of the other door body 14b is rotatably supported. The tip is supported by a shaft bearing part 28 attached to the inner surface of the outer cylinder 12.

29 is a key for fixing one end of the door body 14a and the output shaft 21;
30 is a bearing interposed between the other end of the door body 14b and the output shaft 27.

Although FIG. 6 shows the rotation drive unit 15 on the left side of FIG. Part 15 will be explained.

Next, the sequence of propulsion work using the above-mentioned lead pipe 1 will be explained with reference to FIG.
With 4a and 14b open, the jack 10 is extended to propel the front end into the ground.

At this time, even if the ground is soft, the leading portion 3 is guided by the stationary main body 4 and moves to extend, so it is propelled completely concentrically with the main body 4.

In addition, as the leading head 3 is propelled, dirt and water flow into the chamber 18 from the face opening, but since the face side and the propulsion pipe side are separated by the continuous door body 11, the dirt and water are propelled. It does not flow into the pipe 2 side.

Next, as shown in b, the door bodies 14a and 14b are closed to prevent sand and water from flowing into the leading pipe 1 from the tuyere 5, and then the closing door body 11 is removed to push out the sand and the like that previously flowed into the chamber 18. It is carried to the surface of the earth through pipe 2.

When the removal of earth and sand is completed, as shown in C, the propulsion pipe 2 at the rear end
A hydraulic jack 31 interposed between the rear end and the back conch IJ-)3:l is extended as shown by the arrow to push the main body 4 and the propulsion tube 2 toward the stationary leading end 3.

At this time, the jack 10 performs a contraction operation.

Next, as shown in d, after closing the continuous door body 11, 14a, 14b
The jack 10 is opened and the extended hydraulic jack 31 is contracted, and a joint member 33 is appropriately inserted between the hydraulic jack 31 and the back concrete 32 or between the rear end of the propulsion pipe 2 and the hydraulic jack 31. Returns to step a by extending the , and repeats the operations a to d. When propelled by the length of the propulsion tube 2, new propulsion tubes 2 are sequentially replenished to form a buried conduit.

Although the above explanation has only been about the propulsion method in soft ground, the lead pipe of the present invention can also be effectively used in the propulsion method when burying a large diameter pipe in relatively hard ground. .

In other words, the jack provided in the leading pipe of the present invention can obtain a large pushing force because its thrust is not wasted in the propulsion resistance between the propulsion pipe and the ground, but is used only to push the leading part into the ground. After the leading part is pushed in, the propulsion of the main body and the propulsion tube requires only a relatively small thrust because the movement resistance between them and the ground is the only force.

The present invention can be implemented as shown in the above embodiments, and if the lead pipe is used, even on soft ground,
It can be propelled accurately without ground improvement, it can perform propulsion work efficiently and economically under adverse conditions, and it can easily construct large-diameter buried pipes in relatively hard ground using the propulsion method. Not only that, but also because it has a double door structure with a door body and a continuous door body, if dirt or water flows into the room from the face opening due to the propulsion of the leading part, it will be propelled by the continuous door body. In addition to preventing dirt and water from flowing into the pipe side, by closing the door body when carrying indoor sediment to the surface, it is possible to prevent dirt and water from flowing into the lead pipe through the siding. Therefore, it can be opened and closed easily.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view;
Figure 2 is a view from the ■-■ arrow in Figure 1, and Figure 3 is a view from ■-■ in Figure 1.
■A cross-sectional view in the direction of the arrows, Figure 4 is a partially enlarged cross-sectional view of the tip of the leading pipe, Figure 5 is a cross-sectional view showing the state of the seal part of the connecting device during the opening operation of the door, and Figure 6 is a cross-sectional view of the rotary drive unit. The enlarged sectional view, FIG. 7, is an explanatory diagram showing the order of operation. 1... Leading pipe, 2... Propulsion pipe, 3... Leading part, 4
...Body part, 5... Face, 6... Connecting part, 1...
・Inner cylinder, 8... Outer cylinder, 9... Annular space, 10...
Jyatsuki, 11...Inner cylinder. 12... Outer cylinder, 13... Annular space, 14a, 14b
... Door body, 15... Rotation drive unit, 16... Connector, 11... Continuous door body, 18... Room.

Claims (1)

[Claims] 1. A pipe comprising a leading end having a tuyere and a main body that fits and holds the leading end so as to be relatively movable in the direction of the tube axis, and the leading end is inserted into the main body between the rear end of the leading end and the main body. A pair of spherical door bodies are provided in the top of the tuyere in the vicinity of the tuyeres, and a chamber is provided between the main body and the door bodies. A leading pipe for a propulsion method, characterized by being provided with a continuous door body capable of forming.