JP2672788B2 - Discharge type pipe propulsion burying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth-moving pipe propulsion and burying device for forming pipes for discharging water, sewage, communications, etc. in the ground where roads, levees, railway tracks, waterways, etc. are present. .

[0002]

2. Description of the Related Art As a general method of burying a small-diameter pipe such as a vinyl chloride pipe in the ground, the expansion head is towed and propelled in the ground by a pilot pipe, and the buried pipe connected to the rear of the expansion head is grounded. A tow-type propulsion burial method is known in which tow-propulsion is performed inside. In this towed propulsion burying method, further, an earth and sand introduction port is formed in front of the expansion head, and the earth and sand is scraped into the expansion head from the earth and sand introduction port and removed behind the expansion head, while the expansion head is grounded. There is an earth-moving type that is towed and propelled inside. This earth-discharging type is widely used because it has a small frictional resistance with an expanding head for propelling underground and earth and sand added to a buried pipe, and is suitable for embedding pipes in gravel ground or hard ground.

In this earth scavenging propulsion and burying method, a plurality of buried pipes are added to the rear of the expansion head, and the expansion head is towed and propelled by a pilot pipe into the ground, so that a plurality of pipes are linearly connected to the ground. The buried pipe is buried. In this construction method, when the embedded pipe is directly connected and fixed to the rear end of the expansion head and the embedded pipe is directly pulled by the expansion head,
Since a large traction propulsion force is applied to the buried pipe, the connecting portion between the buried pipes must be strong enough to withstand the load. However, in recent years, in the case of buried pipes such as vinyl chloride pipes and fume pipes, which are in great demand, are connected with adhesives or collars, due to the insufficient strength of the joints between the buried pipes, direct traction promotion by the expansion head Sometimes the pipe connections are more likely to break.

Therefore, as an earth-discharging-type propulsion burying method for safely and reliably burying a buried pipe such as a vinyl chloride pipe in the ground, the buried pipe is inserted into a casing led out to the rear of the expansion head, and the tip of the casing is inserted. The applicant's patent application is the construction method in which the embedded pipe is held between the stopper and the expansion head attached to the casing, and the casing and the stopper are pulled by the expansion head and the embedded pipe is propelled by the stopper. It has been developed and implemented in No. 2-211341.
A specific example thereof will be described with reference to FIGS. 8 to 10.

As shown in FIG. 8 (a), a starting shaft 1 and a reaching shaft 2 for work are formed at both ends of a section where a conduit is buried underground in a road or the like, and a hydraulic type installed in the starting shaft 1 A jack 4 pushes a pilot pipe 6 headed by a pilot head 5 from the starting vertical shaft 1 toward the reaching vertical shaft 2 into the ground to propel it. Each time the pilot head 5 advances in the earth and sand 3 by one length of the pilot pipe 6, a new pilot pipe 6 is added, and the plurality of pilot pipes 6 are sequentially propelled like a scale.

When the pilot head 5 and the leading pilot pipe 6 reach the reaching shaft 2, the pipe propulsion operation of the jack 4 is stopped, the pilot head 5 is removed from the leading pilot pipe 6, and instead, as shown in FIG. ) An earth discharging type expansion head 7 as shown in FIG.

9 and 10 show an example of the structure of the enlarged head 7, which comprises a cylindrical head body 8 and a connecting pipe 9 fixed to the center thereof. The pilot pipe 6 is detachably screwed to the threaded portion 10 on the outer periphery of the tip end of the connecting pipe 9 protruding from the front end of the head main body 8, and the cylindrical casing 11 is coaxially detachably screwed to the rear end of the connecting pipe 9. To be dressed. Between the front end of the head body 8 and the connecting pipe 9 is a substantially conical sand retaining plate 1
2 is fixed, and the screw part 1 from the earth and sand stop plate 12 of the connecting pipe 9 is fixed.
A plurality of earth and sand introduction ports 13 are formed between 0. Further, a casing pipe 15 into which the end of the buried pipe 14 is fitted is fixedly connected to the rear portion of the head body 8.

The connecting pipe 9 of the expansion head 7 is connected to the pilot pipe 6.
After the screw is screwed, the distal end of the casing 11 is connected to the connecting pipe 9, and the embedded pipe 14 fitted from the rear of the casing 11 is inserted.
The tip end of is inserted into the casing pipe 15. Between the casing 11 and the buried pipe 14, a supporting jig (not shown) that holds the two coaxially is arranged, and the stopper 16 is brought into contact with the rear end of the buried pipe 14, and the stopper 16 is directly attached to the casing 11. Attach it detachably. Finally, the soil discharging screw 17 is inserted into the casing 11 until its tip reaches the inside of the earth and sand inlet 13.

When the pipe pulling operation of the jack 4 is started in the state shown in FIG. 9, the expansion head 7 and the casing 11 are directly pulled by the pilot pipe 6, and the expansion head 7 and the stopper 1 are pulled.
The buried pipe 14 held between 6 is pushed by the stopper 16 and propelled in the ground. Due to the pulling force of the expanding head 7 in the ground, the soil 3 in the ground is slid from the front end of the head body 8 along the sediment stop plate 12 and scraped into the sediment introduction port 13, and then the soil discharging screw 17 in the connecting pipe 9 is pushed. To reach. By rotating the earth discharging screw 17 with the motor 18, the earth and sand inlet 13
The earth and sand 3 that has been scraped and introduced is sequentially transferred rearward by the earth discharging screw 17, and is removed from the rear end of the casing 11 to the outside.

As described above, if the expansion head 7 and the casing 11 are directly pulled by the pilot pipe 6 and the buried pipe 14 is propelled in the ground by pressing the stopper 16, the buried pipe 14 is largely pulled. No propulsive force is applied. Therefore, even if the buried pipe 14 is a vinyl chloride pipe or a fume pipe in which the strength of the connecting portion between the pipes is likely to be insufficient, it is possible to safely and reliably promote and bury them in the ground.

[0011]

When the expansion head 7 is towed and propelled into the ground by the pilot pipe 6, the expansion head 7 scrapes and introduces the earth and sand 3 into the earth and sand introduction port 13 by its own traction propulsion force. However, the friction resistance between the front part of the expansion head 7 and the earth and sand 3 is large, and the stones contained in the earth and sand 3 are clogged in the earth and sand introduction port 13, so that the earth and sand 3 is not smoothly introduced into the earth and sand introduction port 13. There are many. Enlarging head 7
If the sediment 3 is not smoothly introduced into the sediment introduction port 13 during the towing and propulsion of, the improper propulsion resistance acts on the tip of the expansion head 7 and the expansion direction of the expansion head 7 becomes unstable, causing the expansion head 7 to meander. Construction accuracy of pipe propulsion and burying is deteriorated by promotion.

An object of the present invention is to provide an earth-moving pipe propulsion and embedding device which improves smoothness of pipe propulsion embedding by constantly smoothing the introduction of the sediment into the sediment introduction port of the expansion head towed and propelled underground. To provide.

[0013]

DISCLOSURE OF THE INVENTION According to the present invention, a large diameter soil discharge is provided at the tip of the pilot pipe propelled in the ground and reaching the reaching shaft, and having a sediment introduction port on the pilot pipe side front part. Connect the expansion head coaxially, connect the buried pipe to the rear part of this expansion head, and use the pilot pipe with the soil discharge screw rotatably inserted and held in the expansion head to the position where it reaches the sediment introduction port. an enlarged head by introducing raking the sand into the enlarged head from sand inlet of the enlarged head while pulling propulsion in the ground, in the tube propulsion embedded device to discharge into the enlarged head backwards earth removal Sukuryuu rotating the sediment, the Formed in the center of the front part of the expansion head
A circle that encloses the sediment inlet and the sediment inlet in the front part
Expanded by being rotatably arranged in the surrounding area and being towed and propelled underground
Enlarged head by rotating independently at the front end of the head
A concave cone that slides the sediment on the front of the door into the sediment inlet
A rotating body with a front surface and a partial conical front surface of this rotating body
The protrusion for crushing sediment and the built-in rear of the rotating body.
And a hydraulic motor for rotating the rotating body.

In the present invention, the concave portion of the rotating body is
Both the front surface of the circular cone and the inlet of the earth and sand can be soiled by the rotating force of the rotating body.
Shaving the sand and fixing the nail pieces that will be crushed by crushing,
Stable crushing function and sediment introducing function by rotating body
Desirable for volatilization.

[0015]

When the rotating body is installed in the front part of the expanding head and the rotating body is rotated when the expanding head is towed and propelled into the ground, the rotation of the rotating body dissolves the earth and sand, and The lumps of earth and sand and stones are crushed to reduce clogging of the earth and sand at the earth and sand introduction port of the expansion head, and the introduction of the earth and sand to the earth and sand introduction port becomes smooth. As a result, the expansion head is towed and propelled in the ground with less frictional resistance, the straightness of the expansion head during towing and propulsion is improved, and the pipe propulsion burying construction accuracy is highly stable. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same or corresponding portions are denoted by the same reference symbols throughout the drawings including FIGS. 8 to 9, and description thereof will be omitted.

The enlarged head 21 shown in FIG. 1 has a cylindrical head body 22 and a connecting pipe 2 fixed to the center thereof.
3 and a rotating body 24a that is rotatably fitted in the outer circumference of the connecting pipe 23 protruding from the head body 22 in the circumferential direction.
The screw portion 2 in which the pilot pipe 6 is detachably screwed on the outer periphery of the tip end portion of the connecting pipe 23 protruding from the front end of the rotating body 24a.
5, the earth and sand introduction ports 26 are formed at four circumferential positions of the connecting pipe 23 between the screw portion 25 and the rotating body 24a. Further, the casing pipe 15 into which the end portion of the buried pipe 14 is fitted and inserted is connected and fixed to the rear portion of the head body 22, and the casing 11 can be coaxially detached from the rear end portion of the connecting pipe 23 extending into the head body 22. Screwed. Casing 11
A soil discharging screw 17 is inserted in the screw, and the tip of the soil discharging screw 17 is located inside the earth and sand inlet 26 of the connecting pipe 23.

The rotary body 24a is, for example, a rotary cylinder 24b rotatably fitted in the connecting pipe 23 via a bearing 27.
Is integrally fixed to the front end surface of the unit with a plurality of bolts. The front surface m of the rotating body 24a has a concave conical shape and faces the earth and sand introduction port 26 of the connecting pipe 23. The integrally formed rotary body 24a and rotary cylinder 24b is rotationally driven and controlled by a hydraulic motor 29 built in the head body 22. The hydraulic motor 29 is used for the head body 2
2 and the connecting pipe 23 are fixedly arranged, and a gear 31 of a rotary shaft 30 thereof meshes with an internal gear 32 on the inner circumference of the rotary cylinder 24b. When the rotary shaft 30 is rotated by the hydraulic motor 29,
The rotary cylinder 24b and the rotary body 24a independently rotate with respect to the head main body 22. The rotator 24a is configured to be reversible in the normal and reverse directions, and is normally rotated in a fixed direction, but it may be occasionally reversed when it digs into a hard rock. Also, the rotating body 2
Although it is possible to rotate 4a by means other than the hydraulic motor 29, rotating the hydraulic motor 4a by the hydraulic motor 29 is mechanically simple, and functionally stable rotation operation is possible, which is highly reliable.

A water jet (not shown) is formed near the earth and sand inlet 26 of the connecting pipe 23 and at the boundary between the rotary cylinder 24b and the head main body 22, so that the expansion head 21 can be pulled and propelled in the ground. You may make it improve the sex. Further, the water supply hose (not shown) of these water ejection ports and the hydraulic hose (not shown) of the hydraulic motor 29 may be pulled out rearward from the head main body 22.

When the expansion head 21 is towed and propelled in the ground by the pilot pipe 6, the rotary body 24a is rotationally driven by the hydraulic motor 29. Thereby, the conical front surface m of the rotating body 24a
While the earth and sand are being pressed, the earth and sand are crushed by receiving a rotational force, and by this crushing, the earth and sand are positively scraped and introduced into the earth and sand inlet 26, and are removed by the earth discharging screw 17. Therefore, the clogging of the earth and sand at the earth and sand introduction port 26 of the expansion head 21 is reduced, the introduction of the earth and sand into the earth and sand introduction port 26 becomes smooth, and the expansion head 21 has less frictional resistance and is able to move straight in the ground. Towed and propelled.

The effect of improving the straightness of the rotating head 24a when the expanding head 21 is pulled and propelled by the rotation of the rotating body 2 is as follows.
4a can be stably exhibited by rotating the hydraulic motor 29 with certainty, and more effectively and surely by the following.

For example, as shown in FIGS. 2 and 3, projections 35 are integrally formed at a plurality of positions on the front surface m of the rotating body 24a. When the rotating body 24a having the protrusions 35 on the front surface m is rotated while being propelled into the ground, the protrusions 35 bite into the earth and sand and actively rotate, whereby the effect of crushing the earth and sand by the rotating body 24a is increased, and Can be more smoothly introduced into the earth and sand introduction port 26.

Enlargement head 21 shown in FIGS.
Is a structure suitable for towing and propelling to gravel ground or hard ground, and includes two types of first claw pieces 36a on the front surface m of the rotating body 24a.
And the second claw piece 36b are fixed, and the earth and sand introduction port 2 is connected to the connecting pipe 23.
One type of third claw piece 36c is fixed along the line 6. The first claw piece 36a is a cemented carbide chip that is fixed in large numbers at a small pitch on the peripheral edge of the front surface m of the rotating body 24a. When the rotating body 24a is rotated in the ground, the ground is ground, and the expansion head 2 is used even on hard ground.
Make 1 easy tow and propel.

Further, as shown in FIG. 7, the second claw pieces 36b are provided on the front surface m of the rotating body 24a at two positions at 180 ° intervals.
It is a triangular protrusion fixed by a bolt 37 so as to protrude forward. As shown in FIG. 6, the third claw piece 36c is fitted to one edge portion of the earth and sand introduction port 26 of the connecting pipe 23 and fixed to the connecting pipe 23 with a bolt 38. The third claw piece 36c is
It is attached to each of the four earth and sand inlets 26 in the same direction. The size, shape, and mounting position of the third claw piece 36c and the second claw piece 36b are set so that a stone or a lump larger than the earth and sand inlet 26 in the earth and sand is sandwiched and crushed.

When the expanding head 21 of FIG. 4 is towed and propelled into the ground by the pilot pipe 6, when the rotating body 24a is rotated, the first claw piece 36a scrapes the hard ground to expand the expanding head 21.
The propulsion resistance of is made small and the straightness is improved. Further, if there is a stone in the ground that is larger than the earth and sand introduction port 26, the stone is pinched by the second claw piece 36b and the third claw piece 36c while being rotatively moved on the front surface m of the rotating body 24a, and is finely crushed. Is introduced into the earth and sand introduction port 26. Therefore, even if the expansion head 21 is towed and propelled into the ground such as gravel layer ground, the earth and sand inlet 26 does not become clogged with earth and sand, and the towed and propelled head 21 is stably continued. The earth and sand crushing function of the various claw pieces 36a, 36b, and 36c can be more firmly and reliably exhibited by rotating the rotating body 24a at regular angles.

[0026]

According to the present invention, when the expanding head is towed and propelled into the ground, the rotating body in the front part of the expanding head is independently rotated. As it is crushed and crushed, and it is positively scraped and introduced into the sediment introduction port as it is, it becomes possible to smoothly introduce the sediment into the sediment introduction port. As a result, the expansion head is towed and propelled in the ground with less frictional resistance, the straightness of the expansion head at the time of towing and propulsion is improved, and the construction accuracy of pipe propulsion burying can be improved.

The crushing effect of earth and sand by the above-mentioned rotating body is obtained by forming protrusions on the front surface of the rotating body or fixing claw pieces for crushing earth and sand on the front surface of the rotating body and the earth and sand inlet.
It becomes more effective, and it is possible to provide an earth-moving pipe propulsion and embedding device equipped with a highly versatile expanding head suitable for gravel ground.

[Brief description of the drawings]

FIG. 1 is a side view including a partial cross section of an enlarged head showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a perspective view of a rotating body in the enlarged head of FIG.

FIG. 4 is a side view including a partial cross section of an enlarged head showing a second embodiment of the present invention.

FIG. 5 is a sectional view taken along the line BB of FIG.

6 is a partially enlarged cross-sectional view of an enlarged head connecting pipe portion of FIG.

FIG. 7 is an enlarged cross-sectional view taken along the line 5C-C of FIG.

FIG. 8 is a sectional view in the ground for explaining the earth scavenging pipe propulsion and embedding device according to the present invention, in which (a) is a pilot pipe propulsion and (b) is an enlarged head traction propulsion propulsion system.

9 is a side view including a partial cross section of the enlarged head in FIG.

FIG. 10 is a cross-sectional view taken along the line 9D-D of FIG.

[Explanation of symbols]

 2 Arrival shaft 3 Sediment 6 Pilot pipe 17 Discharge screw 21 Enlargement head 24a Rotating body 26 Sediment inlet 29 Hydraulic motor 35 Protrusion 36a Claw piece 36b Claw piece 36c Claw piece

Claims (2)

(57) [Claims] 1. An earth-discharging expansion head having a diameter larger than that of a pilot pipe having a sediment introduction port on the pilot pipe side is coaxially connected to the tip of the pilot pipe propelled in the ground and reaching the reaching shaft. , Connect the buried pipe to the rear of this expansion head,
With the soil discharge screw rotatably inserted and held in the expansion head to the position where it reaches the sediment introduction port, pull the pilot head into the ground with the pilot pipe and push it into the ground from the sand introduction port of the expansion head introducing raking the soil, in tubes propulsion embedded device to discharge into the enlarged head backwards earth removal Sukuryuu rotating the sediment, the enlarged heads
The door is rotatably arranged in the circumference area surrounding the sediment inlet in the center of the front part and the sediment inlet in the peripheral part of the front part.
Placed against the enlarged head that is towed and propelled underground
By rotating independently at the front end, the sediment on the front of the expansion head can be
Rotating body having a concave conical front surface to be slid into the introduction port
And for the crushing of the sand that is partially projected on the conical front surface of this rotating body
Protrusions and hydraulic pressure that is built in behind the rotating body and drives the rotating body to rotate
An earth-discharging-type pipe propulsion and burying device having a motor . 2. The twin of the conical front surface of the rotating body and the earth and sand introduction port.
Toward the other side, it scrapes the earth and sand with the rotating force of the rotating body, sandwiches it and crushes it.
The earth scavenging pipe propulsion and burying device according to claim 1, wherein a hard claw piece is fixed .