JPS6152319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for burying a tube underground.

Construction work to bury small-diameter pipes underground for water, sewage, gas, electric wires, telephone lines, etc. has been increasing in recent years, but in the past, in this type of pipe burying work, it was difficult to bury the pipes where they were to be buried, such as on roads. A groove is opened, the pipe body is placed in the groove, and then the groove is filled.

However, this construction method not only does not allow the pipe to be buried deep underground, but also has the drawback of creating traffic congestion in today's high-traffic environment.

Therefore, a construction method has already been developed that involves excavating and burying the pipe at the same time.To explain this method simply using drawings, as shown in Figure 1a, first, the pipe is buried.
Pit 2, 2'... facing the road etc. to be buried.
... is excavated and a double pipe consisting of a pipe body 1 and an earth removal pipe 3 rotatably inserted into the pipe body 1 is pushed from the shaft 2 toward another shaft 2'. A cutter member 4 is attached to the tip of the earth removal pipe 3, which crushes earth and sand by giving rotation to the earth removal pipe 3, and discharges this earth and sand to the shaft 2 side by the action of a spiral plate 5 arranged on the inner wall of the earth earth removal pipe. .

The propulsion of the pipe body 1 and the rotation of the earth removal pipe 3 are provided by a propulsion mechanism 6 and a rotation mechanism 7 provided in the shaft 2, and a double pipe consisting of a unit length pipe body 1' and a unit earth discharge pipe 3'. When the pipe body 1 has penetrated to the next shaft 2', remove the cutter member 4 as shown in Fig. 1b.
As shown in FIG. 1c, the burial work between the shafts 2 and 2' is completed by pulling out only the earth removal pipe 3, leaving the pipe body 1 behind.

Now, to describe the above conventional example in more detail with reference to FIG. 2, the rotation of the gear motor 11 is transmitted through the rotation transmission member 12.
is transmitted to the chuck 13 that grips the earth removal pipe 3, and the main body 14 of the propulsion mechanism 6 is transferred to the propulsion jack 15.
The tube body 1 is pushed into the soil by the presser metal 16.

The earth removal pipe 3 has bearings 17, 17... in the pipe body 1.
The earth and sand scraped off by the cutter member 4, which is rotatably supported through ..., is discharged by the rotation of the earth discharge pipe 3 due to the action of the spiral plate 5 disposed on the inner wall of the earth earth discharge pipe 3.

In addition, if necessary, water is supplied from the water supply port 18, and the water is ejected from the water fountain 19 provided at the tip of the earth discharge pipe to turn the excavated soil into mud and discharge it.In such a case, the spiral plate 5 is not used. It is also possible to remove soil by just sending the water mentioned above.

Since this kind of conventional pipe burying equipment has the above-mentioned configuration, construction work can be carried out without any particular problem on high ground where the groundwater level is low. During the drilling work, an accident occurred in which muddy earth and sand unexpectedly flowed into the shaft 2 through the earth discharge pipe 3 due to earth pressure, which was not only dangerous for the workers in the shaft, but also caused the equipment to become filled with earth and sand. There were times when I got caught.

In order to prevent such accidents from occurring, measures have already been taken to lower groundwater pressure in advance.
Countermeasures such as injecting chemical liquid into the ground to solidify it have been taken, and this is one of the causes of increased costs.

In addition, as an emergency measure, there is a method of putting a lid on the soil discharge port of the soil discharge pipe to seal the inside of the soil discharge pipe and proceed with drilling, but since the cap must be removed when discharging soil or connecting the pipe body, it is necessary to prevent soil from being removed. The drawbacks were that they were not completely free from the real danger of leakage, that the inside of the earth removal pipe could not be observed, and that a great deal of labor and time had to be spent on each opening and closing operation.

Furthermore, an auger screw is inserted directly into the pipe body, and a shutter mechanism is provided at the tip end on the excavation side, which opens when the auger screw rotates in the forward direction during excavation and closes when the auger screw rotates in the reverse direction. (Utility Model Application No. 55-59766) also exists,
When this happens, when earth and sand flows into the tube due to spring water, etc., the shutter mechanism is closed, and by pressing the tube in this state, the ground on the tip side of the tube is consolidated. Although it is possible to resume propulsion using the auger screw,
Since the shutter mechanism is in the open state, there is no function to prevent an unexpected large amount of muddy water from flowing out, and it can only be prevented if the spill is known.

The present invention has been made in order to eliminate such drawbacks, and is provided with a shutter mechanism 21 that divides the inside of the earth removal pipe 3 into a hole drilling side and an earth removal side, and the shutter mechanism 21 is closed to allow drilling. The aim is to prevent unintentional sediment outflow by carrying out promotion work.
That is the purpose.

To explain the present invention in detail with reference to the drawings below, FIG. 3 is a schematic cross-sectional view showing the main part of the first invention, in which (a) shows the state during drilling and b shows the state during soil removal. A shutter mechanism 21 is provided in the earth removal pipe 3 to divide the inside of the pipe into a drilling side 22 and an earth removal side 23 at its tip side, and the shutter mechanism 21 is closed as shown in Fig. 3a. state, the excavation pipe 3 is rotated while applying a pushing force to the pipe body 1 as is known in the art, to advance the drilling, and the drilling promotion is temporarily stopped, and then the shutter mechanism is activated as shown in Fig. 3b. By opening 21 and rotating the earth discharge pipe 3 in the opposite direction, the earth and sand taken into the hole side 22 are discharged by the spiral plate 5.

FIG. 4 shows an example of the shutter mechanism 21 in detail. Two shutter members 2
4, 25 and one rotation prevention member 26, and the shutter members 24, 25 are connected to the flange 2.
7 and 28 are removably fixed to the end flanges 29 and 30 of the unit earth discharge pipes 3' and 3'', respectively, by bolts and nuts B, and through holes 31 and 32 are provided on the opposite side of the flanges 27 and 28, respectively. Opening/closing bottom plates 33, 34 are provided, and the bottom plates 33,
34 are in contact with each other via a bearing A so as to be rotatable.

The rotation preventing member 26 has a ring shape as shown in FIG. The stoppers 36, 36' of the other shutter member 24 are protruded from each other, and the opening/closing bottom plate 3 of the other shutter member 24 is provided with a protrusion.
A protruding edge 37 is integrally provided on the outer periphery of the rotation preventing member 26 and is fitted so that it can freely rotate. Oppositely protruding locking projections 38, 38' are provided.

In this way, the shutter member 25 and the rotation prevention body 26 move together due to the rotation of the unit discharge pipe 3'', and are rotated within a range of approximately 180° in which the locking protrusions 38, 38' engage with the stoppers 36, 36'. It is possible to move.

The through holes 31 and 32 have a locking protrusion 38 on the right side of the stopper 36, as shown by the solid line in FIG.
However, when the locking protrusion 38' is in contact with the left side of the stopper 36', the positions match and the shutter mechanism 21 is opened, and by rotating the earth discharge pipe 3'' clockwise, the through hole 32 is aligned with the dashed-dotted line. As shown in the figure, the protruding edge 37 further includes a pull-out prevention member 39 which is removably fixed to the rotation prevention member 26 by a bolt nut C. in sliding contact with the
Thus, the unit earth discharge pipes 3', 3'' and the shutter member 2
4 and 25 together ensure forward movement (in the direction of the arrow in FIG. 4a) and backward movement.

Now, if we assume that the unit earth discharge pipe 3'' in Figure 4 is on the soil removal side and 3' is on the drilling side, the unit earth discharge pipe 3'' is rotated in the direction of the arrow shown in Figure 4b by the rotation mechanism 7. For example, it can be in the above-mentioned closed state,
In this state, if the earth removal pipe 3 continues to rotate while applying a driving force to the pipe body 1 and the earth removal pipe 3, the earth and sand scraped off by the cutter member 4 at the tip of the earth earth removal pipe 3 will be taken into the unit earth removal pipe 3'. At this time, even if earth and sand flows out, the shutter member 21
This will prevent the outflow.

Incidentally, when the above-mentioned earth removal pipe 3 is used to promote excavation, if the earth earth removal pipe 3 is equipped with a spiral plate 5, the earth removal pipe 3 is rotated in the forward direction to scrape it off with the cutter member 4. The earth and sand
Although the earth is sent to the ground side by the spiral plate 5, at this time, the earth discharge pipe 3
is pushed into the ground side together with the pipe body 1, and there is no place for the earth and sand to escape on the ground side.Therefore, the earth and sand ends up seeking an escape inside the earth discharge pipe 3 on the excavation side 22, and finally, the earth and sand go into the earth removal pipe 3 on the excavation side 22. The side 22 ends up being filled with the earth and sand that has been scraped away.

Next, when drilling is continued and the inside of the unit earth removal pipe 3' is full, the propulsion is stopped and the earth earth removal pipe 3 is rotated in the opposite direction (in the direction of the arrow in Fig. 4b). Through holes 31, 3 of shutter members 24, 25
2 match and the inside of the earth discharge pipe communicates with each other, so if the earth and sand is muddy, it will remain as it is, and even if it is not muddy, the stoppers 36 and 3 will be removed by the above-mentioned reversal.
6', the earth removal pipe 3 is secured by the engagement of the locking protrusions 38, 38'.
The earth rotates in that direction, so the earth is forcibly removed by the spiral plate, and once the earth has been removed from the earth removal pipe, the earth removal pipe is again rotated in the direction of the arrow in Figure 4b, and the earth is shattered. The mechanism is closed and the propulsion work is performed in the same manner as described above.

When working on solid ground with no risk of earth and sand flowing out, leave the shutter mechanism 21 in the open state, that is, rotate the earth removal pipes 3'' and 3' in the opposite direction of the arrow in Fig. 4b. It goes without saying that if a driving force is applied to the pipe body 1 and the earth removal pipe 3, the drilling work can be carried out continuously.

Next, FIG. 5 shows another example of the shutter mechanism, and the basic structure and operation are the same as those shown in FIG. 4, but in this embodiment, the shutter member 2
The locking protrusions 40, 40' provided with 4 are shown in FIG.
As shown in c', it extends in the axial direction of the member 24, while the rotation preventing member 26' is rotatable between the flange portion 42 for fixing to the flange 35 of the shutter member 25 and the outside of the shutter member 24. The inner periphery of the flange portion 42 is configured to be in sliding contact with the engagement step 44 on the protruding edge 37 of the shutter member 24, and are the locking protrusions 40, 4 of the shutter member 24 as shown in FIGS. 5c and c'.
Stops 41, 41' that engage with 0' are provided.

Therefore, according to this embodiment, the stopper and the locking protrusion extend in the axial direction and have a sufficient contact area than those shown in FIG. 4, so that a larger torque during propulsion can be applied. It becomes possible to communicate.

As described above, according to the pipe burying device of the above invention, it is possible to completely prevent earth and sand from flowing out during excavation work, which is the most likely to occur. It is also necessary to anticipate that the earth and sand will flow out during the soil removal work, so in the second invention of the present application, two additional shutter mechanisms are provided in order to completely prevent the earth and sand from flowing out during the earth removal work. The interior of the earth removal pipe is divided into a drilling side, an intermediate section, and an earth removal side, and the operations of both shutter mechanisms are related in a predetermined manner, so that when one is in an open state, the other is in a closed state. It is designed to do so.

Hereinafter, the second invention of the present application will be explained with reference to FIG. 6. FIG.
is added to the front of the shutter mechanism 21, and the soil discharge pipe is divided into three sections: a hole drilling side 22', an intermediate section 22'', and a soil discharge side 23.

By adopting the mechanisms shown in FIGS. 4 and 5, when the earth removal pipe 3 is rotated in one direction, one of the two shutter mechanisms 21 and 21' becomes open and the other is closed, and the same If 3 is reversed, one side will be closed and the other side will be open.

Therefore, in order to use this, during propulsion drilling, as shown in Figure 6a, the shutter mechanism 21 on the earth removal side is in the closed state, and the shutter mechanism 21' on the drilling side is in the open state, and the excavation is carried out. No. 6 during soil removal.
As shown in Figure b, the shutter mechanism 2 on the earth removal side
1 is opened, the shutter mechanism 21' on the drilling side is closed, and the earth and sand taken into the intermediate section 22'' is discharged.In this way, earth and sand outflow accidents can be prevented by the shutter mechanism 21' on the earth discharge side when drilling is in progress. 21, the excavation is stopped by the drilling side shutter mechanism 21' during soil removal.

As described above, according to the first invention of the present application, there is a pipe buried underground, an earth removal pipe fitted into the pipe so as to be rotatable, and a cutter member attached to the tip of the earth removal pipe. In a pipe burying device comprising a rotation mechanism that rotates the earth removal pipe, and a propulsion mechanism that pushes the pipe into the ground, the inside of the earth removal pipe is moved toward the drilling side by forward rotation when the earth earth removal pipe is propelled. a shutter mechanism that can be closed to separate the excavation pipe from the excavation side and the excavation side, and can be opened so that the excavation side and the excavation side communicate with each other by reverse rotation of the excavation pipe, which is opposite to the forward rotation; Since it is attached to the earth removal pipe, if drilling is performed with this shutter mechanism in the closed state, it is possible to prevent the outflow of earth and sand during drilling, and it is also possible to observe the inside of the pipe during work. This can be done without any problems by developing the following.

Further, according to a second invention, in addition to the first invention, the intermediate section and the hole-drilling side of the earth removal pipe are opened to communicate with each other by forward rotation of the earth removal pipe, and the earth earth removal pipe is reversely rotated. Therefore, we installed a second shutter mechanism on the earth removal pipe that can be freely closed to separate the intermediate section from the drilling side. Even when drilling is stopped, such as during work, the outflow of earth and sand can be completely prevented.

[Brief explanation of the drawing]

Figures 1 a, b, and c are cross-sectional explanatory diagrams showing a method of simultaneously excavating and burying pipe bodies, Figure 2 is a schematic cross-sectional view showing a conventional pipe burying device, and Figures 3 a, b are main A sectional view of a main part of an embodiment showing the first invention of the inventive device,
Fig. 4 shows an example of the shutter mechanism, a is a cross-sectional plan view thereof, b is a cross-sectional view taken along line b-b' of a, Fig. 5 is another example of the shutter mechanism, a is a cross-sectional plan view thereof, and b is a cross-sectional view of a. Fig. 6 is a sectional view taken along the line b-b' of a, c and c' are exploded views of main parts of a, and Fig. 6 is a sectional view of main parts of an embodiment of the second inventive device. 1...Pipe body, 3, 3', 3''...Earth removal pipe, 4...
Cutter member, 6... Propulsion mechanism, 7... Rotation mechanism, 21, 21'... Shutter mechanism, 22, 2
2'...Drilling side, 22''...Middle section, 23...Earth removal side.

Claims (1)

[Scope of Claims] 1. A pipe body buried underground, an earth removal pipe fitted into the pipe body so as to be rotatable, a cutter member attached to the tip of the earth earth removal pipe, and a rotatable earth removal pipe fitted to the earth earth removal pipe. and a propulsion mechanism for pushing the pipe into the ground, in which the inside of the earth removal pipe is divided into a drilling side and an earth removal side by forward rotation during excavation of the earth earth removal pipe. The earth removal pipe is equipped with a shutter mechanism that can be closed and opened so that the excavation side and the earth removal side communicate with each other by reverse rotation of the earth removal pipe, which is opposite to the forward rotation. Characteristic pipe burying device. 2. A pipe body buried underground, an earth removal pipe into which the pipe body is rotatably inserted, a cutter member attached to the tip of the earth earth removal pipe, and a rotation mechanism that rotates the earth earth removal pipe. and a propulsion mechanism for pushing the pipe into the ground, which closes so as to divide the interior of the earth removal pipe into an earth removal side and an intermediate section by forward rotation during excavation of the earth earth removal pipe, and The first shutter mechanism, which can be opened freely so that the soil removal side and the middle section communicate with each other, and the forward rotation of the soil discharge pipe, connect the upper middle section and the discharge pipe by reverse rotation as opposed to the forward rotation. and a second shutter mechanism that opens to communicate with the excavation side of the earthen pipe and can freely close to separate the intermediate section from the excavation side by reverse rotation of the earthen excavation pipe. A pipe burying device characterized by being attached to a clay pipe.