JP2547741Y2 - Connection structure between bullet and pipe of bullet culvert excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a corrugated pipe to a bullet of a bullet culvert excavator.

[0002]

2. Description of the Related Art Conventionally, there are roughly two types of bullet culverts. One of them is a so-called mole culvert, in which bullets are only passed through the ground without burying a culvert drain. The other one embeds a tube or a belt-like sheet cylinder (hereinafter referred to as a tube or the like) behind the bullet.

[0003] In the former, like a mole hole, a hole hardly exists for a long time, and a drain hole is provided in preparation for being buried. On the other hand, the latter has a pipe or the like buried in the place where the bullet has passed, so that it can effectively function as a drain pipe for a long time.

However, some buried pipes and the like are easily crushed by earth pressure, and it has been desired to embed a pipe having excellent earth pressure resistance.

[0005]

Therefore, attempts have been made to bury corrugated pipes (commonly referred to as corrugated pipes) that have excellent earth pressure resistance and good water absorption performance. Since the tube is a tube having a very high frictional resistance, the tube is detached from the bullet if it is pulled by a strong force even if it is connected to the rear of the bullet. In addition, the corrugated tube at the connection portion was often torn or deformed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a connection structure in which a corrugated tube is not deformed, broken, or detached from a bullet even when pulled with a strong force. Is what you do.

[0007]

In order to achieve the above object, a connecting structure according to the present invention includes a synthetic resin corrugated tube having an annular ridge and an annular valley, and having the valley formed on the end thereof. A plurality of protrusions, which engage with a plug having a flange portion having a diameter larger than the inner diameter and a diameter smaller than the peak portion and a cylindrical portion slightly smaller in diameter than the valley portion, and engaging with a valley portion of the corrugated tube. It is provided on the inner surface of the rear part in the traveling direction of the cylindrical body that can divide the strip, and a connecting part detachably attached after the bullet is provided in front of the cylindrical body, and the outer diameter of the cylindrical body is gradually increased from the front to the rear. It has a large diameter, and has a cut-off portion provided on the divided mating surface of the cylindrical body, fits the divided cylindrical body to the end of the corrugated tube, and fits a tightening ring around the outer periphery of the cylindrical body. is there.

[0008]

According to the connecting structure of the present invention, a plug having a flange is fitted to the end of a corrugated pipe, and a projection on the inner surface of a cylindrical body which fits into a peak and a valley on the outer periphery of the pipe is formed. Since the tube is engaged with the valley, the tube is sandwiched between the plug and the cylinder, and the tube is hardly deformed or damaged, and does not come off. .

In the connection structure of the present invention, the plug is fitted into the corrugated pipe, the cylindrical body divided from the outside is fitted over the corrugated pipe, and the outer periphery thereof is stopped with the tightening ring without deforming the corrugated pipe. It can be easily fixed and connected. Also, if the tightening ring is moved from the front to the rear in the traveling direction, the cylindrical body has a missing portion on the divided mating surface of the cylindrical body, and the outer diameter of the cylindrical body gradually increases from the front to the rear. Because of the large diameter, the divided arc-shaped portions approach each other to tighten the pipe engaged therein, and the pipe has a plug inside so that the tightening ring Is to stop without moving backward from a predetermined position (a position where tightening is sufficiently performed). Also, the tightening ring can be pulled out by moving it forward, but when the connecting tool is being pulled by a bullet and moving forward, it can easily move forward because the ring comes into contact with external earth and sand even slightly. Never.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a connecting member 1 and a corrugated tube 20 according to an embodiment of the present invention.

The connecting tool 1 is composed of a cylindrical body 3, a connecting portion, and a tightening ring 10. The connecting member 1 is made of a metal or a synthetic resin, but is preferably made of a metal such as iron or aluminum in consideration of strength. The connecting tool 1 is for connecting the corrugated tube 20 and a bullet,
The corrugated tube 20 is arranged inside the cylindrical body 3.
The cylindrical body 3 has a substantially semi-cylindrical half-split structure, is thick from the front 6 to the rear part 7 in the traveling direction of the cylindrical body 3, and gradually increases in outer diameter. . The inside of the cylindrical body 3 is hollow, and a plurality of ridges are provided on the inner surface of the rear portion 7 along the circumference. And
A plate-shaped connecting portion 5 extends from the front end 6 of the cylindrical body 3 to the traveling direction from the chords 26 of the two halves, and the two plate-shaped connecting portions 5 completely overlap each other at the leading end. It has become. A rib 51 for reinforcing the connecting portion is provided between the semicircular body of the cylindrical body 3 and the plate shape. In addition, a connection hole 15 is formed at the plate-shaped tip. This hole 1
5, a connecting hook 28 provided at the rear end of a bullet (not shown) is inserted.

FIG. 2 is a front view showing a state where the corrugated tube 20 is connected to the connecting tool 1 of FIG. The procedure for connecting the corrugated tube 20 to the connector 1 will be described. First, the plug 9 made of a hard synthetic resin or metal is inserted into the tip of the corrugated tube 20. The plug 9 has a cylindrical portion 18 that is formed so as to fit exactly into the inner diameter of the corrugated tube 20, and a cylindrical portion 18 that is larger than the cylindrical portion 18 so as not to fit into the corrugated tube 20. It has a flange smaller than the outer diameter. The tip of the corrugated tube 20 fitted with the plug 9 is placed in the open cylinder 3. At this time, the positions are adjusted so that the troughs 22 at the tips of the pipes 20 are respectively engaged with the ridges 12 on the inner surface of the cylindrical body 3, and the half cylindrical bodies 3 are overlapped. Then, the tightening ring 10 is inserted from the connecting portion 5 and moved toward the rear portion through the front portion 6 of the cylindrical body 3. When the corrugated tube 20 is fitted over the cylindrical body 3, the cylindrical body 3 is designed so that there is always a gap between each of the axially opposed linear edges. A tube 20 between the front 6 and the back 7 of the body 10
Are tightened via the cylindrical body 10 to stop. Since the ring 10 has only a slight gradient on the outer periphery of the cylindrical body 3, once it is in a tightened state, it does not return to the front 6 only by leaving it alone. After the tube 20 is attached to the connecting tool 1 in this manner, the connecting portion 5 is connected to the rear of the bullet.

FIG. 3 is a schematic sectional view showing a use state in which the connecting tool 1 used in the present invention is attached to the auxiliary bullet 30 behind the bullet 31. Reference numeral 100 denotes a construction machine such as a bulldozer for propelling the bullet 31. The bullet 31 is literally a bullet having a conical tip and has a small diameter, and an auxiliary bullet 30 having a diameter larger than that of the bullet 31 is connected to the rear thereof. The auxiliary bullet 30 forms a hole large enough to allow the pipe 20 to be introduced into the ground with a margin. Along the hole is introduced a tube 20 that is fixed to a connector connected to an auxiliary bullet 30. The corrugated pipe 20 is usually a water absorption pipe having many small holes, but is not necessarily limited to the water absorption pipe, and may be a water pipe without small holes for sending water to fields.

[0015]

[Effect of the Invention] As is clear from the above description, the connection structure between the bullet and the pipe of the bullet culvert excavator of the present invention has an effect that the pipe does not come off because the tip of the pipe can be firmly grasped. Play. Also, if the connection structure of the present invention,
Even if the tip of the tube is strongly pulled by the bullet, the tube is not broken or deformed. In addition, the connecting structure of the present invention has a great advantage that connecting the tube to the rear of the bullet does not require any trouble and can be easily and securely mounted.

[Brief description of the drawings]

FIG. 1 is a perspective view of a connecting member and a corrugated tube showing one embodiment of a connecting structure of the present invention.

FIG. 2 is a front view having a partially cut-away cross section showing a state where the corrugated tube is connected to a connecting member.

FIG. 3 is a schematic cross-sectional view showing a use state using the coupling tool used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connecting tool 3 Cylindrical body 5 Connecting part 20 Corrugated tube 10 Tightening ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A synthetic resin corrugated pipe having an annular ridge and an annular valley, a flange having a diameter larger than the inner diameter of the valley and a diameter smaller than the ridge, A plug having a cylindrical portion having a diameter slightly smaller than that of the corrugated tube is fitted, and a plurality of ridges engaged with the valley of the corrugated pipe are provided on an inner surface of a rear portion in a traveling direction of the cylindrical body capable of being divided. In the front of the body, there is provided a connecting portion that is detachably attached after the bullet, the outer diameter of the cylindrical body is gradually increased from the front to the rear, and a cutout portion is provided on the dividing mating surface of the cylindrical body, A connecting structure between a bullet and a pipe of a bullet culvert excavator, wherein a cylindrical body in a state is fitted over a pipe end of the corrugated pipe, and a tightening ring is fitted around the outer circumference of the cylindrical body.