JPH0728463Y2 - Buried pipe for propulsion method - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is an embedding for a propulsion method which is constructed by forming a horizontal shaft in the ground, interconnecting the horizontal shaft, and sequentially propelling the horizontal shaft. Regarding tubes.

(Prior Art) Buried pipes buried in the ground such as sewer pipes, vertical pipes, and cable protection pipes are laid by a propulsion method, for example.
The propulsion method, as disclosed in JP-A-58-120996, forms a vertical shaft in the ground, and from the vertical shaft, insert a buried pipe with a cutting cutter attached at the tip, While forming a horizontal shaft having a diameter slightly larger than that of the buried pipe with a cutting cutter, the buried pipe is propelled into the horizontal shaft and laid. A newly laid buried pipe is joined to the rear end of the buried pipe pushed into the underground shaft to be pushed into the underground shaft and propelled in the shaft.

As the buried pipe laid by the propulsion method, for example,
A buried pipe with a ribbed collar at the rear end in the direction of propulsion is used. As shown in FIG. 6, the buried pipe includes a tubular body 41 having insertion portions 43 and 43 at both ends of a main body portion 42. The outer peripheral surface of each of the insertion portions 43 of the tubular body 41 is cut out so that the wall thickness thereof is approximately 1/2 of the wall thickness of the main body portion 42. One of the insertion portions 43 of the tubular body 41 has a cylindrical collar.
One end of 44 is externally fitted and adhered. The other end of the collar 44 is a receiving portion 47 to which one end of a newly laid buried pipe is inserted and adhered. The color 44
The cylindrical portion 45 has a wall thickness of approximately 1 / th of the wall thickness of the pipe body 41 main body 42 so as not to project outward from the outer peripheral surface of the pipe body 41.
It is said to be 2. A plurality of reinforcing ribs 46 extending in the axial direction are provided on the outer peripheral surface of the cylindrical portion 45 at appropriate intervals in the circumferential direction. The material of the buried pipe is usually hard vinyl chloride resin, including the collar 44.

(Problems to be solved by the invention) In the buried pipe having such a ribbed collar, the pipe body 41
The cylindrical portion 45 of the collar 44 fitted on the insertion opening 43 of the
Since it does not project outward from the outer peripheral surface of the main body portion 45, there is an advantage that the gap generated between the horizontal shaft where the embedded pipe is propelled and the main body portion 42 of the pipe body 41 can be reduced. However, the cylindrical part of the collar 44
Even though the reinforcement rib 45 ensures the strength required for the buried pipe due to the thin wall of the 45, the tip of the collar 44 on the side of the socket 47 side should not hit a hard object when the buried pipe is transported. If it does, the collar 44 may crack. Also, when joining a newly laid buried pipe to the rear end of the buried pipe pushed into the underground shaft, when the buried pipe to be joined is inclined with respect to the preceding buried pipe, Even when the insertion port 43 is forced into the collar 44 of the preceding buried pipe, the collar 44 may be cracked.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a buried pipe for a propulsion method in which the collar is not likely to crack during transportation or construction even when the collar is thin.

(Means for Solving the Problem) The buried pipe for the propulsion method of the present invention is for the propulsion method that is constructed by forming a horizontal shaft in the ground and connecting the insides of the horizontal shaft to each other and sequentially propelling them. A buried pipe, in which outer peripheral portions of respective end portions are cut out to form an insertion opening portion, and a receiving portion externally fitted to the insertion opening portion provided at one end portion of the pipe body. And a collar provided with a reinforcing rib extending over the entire length on the outer peripheral surface of the cylindrical main body, and a reinforcing ring is attached to the tip of the collar on the outer peripheral side of the mouth over the entire circumference. The outer surface of the collar and the outer surface of the tubular body are continuous with each other, whereby the above object is achieved.

(Embodiment) An embodiment of the present invention will be described below.

The buried pipe for the propulsion method of the present invention is, as shown in FIGS. 1 and 2, a pipe body 10 made of synthetic resin such as hard vinyl chloride resin.
And has 20 colors. The tubular body 10 is composed of a straight tubular main body 11 and insertion portions of the same length, which are integrally connected to both ends of the main body 11.
12a and 12b. Outer peripheral portions of the insertion openings 12a and 12b are cut out so that the thickness thereof is half the thickness of the main body portion 11. The inner peripheral surface of the tubular body 10 has the same inner diameter over the entire length.

The collar 20 has a cylindrical collar body 21 whose outer shape and inner diameter are constant. The total length of the collar body 21 is approximately twice the total length of the insertion openings 12a and 12b in the tubular body 10. The collar body 21 has an inner diameter slightly larger than the outer diameters of the insertion portions 12a and 12b, and one end of the collar main body 21 is externally fitted and adhered to one of the insertion portions 12b to form the reception portion 13. To do. The outer diameter of the collar body 21 is equal to the outer diameter of the body portion 11 of the tube body 10, and therefore the wall thickness of the collar body 21 is approximately 1/2 of the wall thickness of the body portion 11 of the tube body 10. . On the outer peripheral surface of the collar body 21, reinforcing ribs 22 having a triangular cross-section extending over the entire length thereof are provided at appropriate intervals in the circumferential direction.

The collar body 21 has an opening 20a at the end opposite to the end fitted to the insertion opening 12b of the tubular body 10. As shown in FIG. 3, at the end face of the collar body 21 in the opening 20a, that is, at the tip of the collar 20 on the side of the receiving portion 13,
A groove 21a is provided along the entire circumference. A reinforcing ring 30 made of a metal material having corrosion resistance such as stainless steel is fitted in the groove 21a. The reinforcing ring 30 has a quadrangular cross-sectional shape that is the same as the cross-sectional shape of the concave groove 21a, and one end surface of the reinforcing ring 30 is flush with the end surface of the collar 20 provided with the concave groove 21a. Reinforcement ring to color body 21
The fitting of 30 may be performed by simultaneous molding at the time of molding the color body 21, or may be performed by using an adhesive or the like after molding the color body 21.

In the buried pipe for propulsion method of the present invention having such a structure, the collar 20 is thin in order to make the outer diameter of the collar 20 the same as the outer diameter of the main body portion 11 of the tubular body 10. Mechanical properties necessary for the buried pipe, such as bending strength, are secured by the reinforcing ribs 22 provided on the outer peripheral surface of the collar body 21. Moreover, since the reinforcing ring 30 made of metal is attached to the end of the opening 20a of the collar body 21, the deformation is suppressed even when the end hits a hard object during transportation, The cracking of the collar body 21 is prevented.

The buried pipe transported to the construction site is pushed into the underground shaft, with the insertion portion 11a of the pipe body 10 without the collar 20 attached first. When the embedded pipe is pushed into the side shaft, an adhesive is applied to the outer peripheral surface of the insertion portion 12a of the tubular body 10 in the subsequent embedded pipe to be laid next, and in this state, the insertion portion 12a The embedded pipe is inserted into the opening 20a of the collar 20 and adhered. By repeating this work while excavating the side shaft, a buried pipe is laid in the ground for a predetermined length.

At this time, the subsequent buried pipe may be joined to the preceding buried pipe in an inclined state. In such a case, the insertion portion 12a of the tubular body 10 in the subsequent buried pipe is forced into the opening 20a of the collar 20 in the preceding buried pipe,
A large load acts on the opening 20a of the collar 20 in the preceding buried pipe. However, since the metallic reinforcing ring 30 is attached to the end of the opening 20a of the collar 20, the collar 20 is not likely to be cracked.

Further, since the collar main body 21 has the same outer diameter as the main body portion 11 in the pipe body 10, the gap generated between the shaft and the outer peripheral surface of the main body portion 11 of the pipe body 10 is also small, and at the time of construction. Debris falling in the side pit and ground subsidence after construction can be suppressed.

As shown in FIG. 4, the reinforcing ring 30 may have an outer peripheral surface exposed to the outer surface of the end of the collar body 21. In this case, the reinforcing ring 30 is not projected outward from the collar body 21, but as shown in FIG.
It can also be a reinforcing ring 30 with ribs. The reinforcing ring 30 includes a ring body 31 having the same outer diameter as the collar body 21 and a plurality of ribs 32 arranged on the outer peripheral surface of the ring body 31 at appropriate intervals in the circumferential direction. Have. The ribs 32 are respectively continuous with a plurality of reinforcing ribs 22 provided on the outer peripheral surface of the collar body 21. These reinforcement rings 30
Also, it is possible to prevent the collar 20 from cracking during transportation of the buried pipe and during construction. Further, the reinforcing rib 30 of the collar 20 may have a taper shape in which the diameter is gradually reduced at the end on the tube body 10 side toward the tube body 10 side. In this case, scraping of the inner peripheral surface of the horizontal shaft by the tapered reinforcing ribs 22 of the collar 20 is suppressed.

The collar 20 to which the reinforcing ring 30 is attached may be manufactured separately from the tubular body 10 and adhered to the insertion port 12b of the tubular body 10 at a construction site or the like. In such a case, it is desirable to attach the reinforcing rings 30 to both ends of the collar 20. When the reinforcing ring 30 is attached to both ends of the collar 20, even if the collar 20 is externally fitted to the insertion opening 12b of the tubular body 10 from any direction,
Since the reinforcing ring 30 is located on the side of the opening 20a, mistakes in mounting the collar 20 are eliminated. In this case, the outer peripheral surfaces of the reinforcing ribs at both ends of the collar 20 may be tapered as described above.

Further, the collar 20 does not need to be configured separately from the tube body 10,
It may be formed integrally with the tubular body 10.

Further, the buried pipe of the present invention may be configured such that a reinforcement ring similar to the reinforcement ring 30 attached to the collar 20 is attached to the end of the insertion portion 12a of the collar 20 to which the collar 20 is not fitted. it can. For buried pipes of this kind, collar 20
Similarly, damage to the insertion portion 12a of the thin tube body 20 is prevented.

(Effect of the Invention) In this way, the embedded pipe for propulsion method of the present invention is such that the reinforcing ring is attached to the tip end portion of the collar, which is externally fitted to one of the insertion portions of the tubular body to form the mouth portion. Is installed, and the outer peripheral surface of the cylindrical body of the collar is provided with reinforcing ribs extending over the entire length, so even if the collar is made thin, the bending pipe strength and other properties necessary for the buried pipe are It is secured by the reinforcing ribs, and even when the end of the collar hits a hard object, its deformation is suppressed by the reinforcing ring, and the collar can be prevented from cracking during transportation or construction. Further, by making both the outer peripheral surfaces of the collar and the pipe body continuous, the gap between the horizontal shaft and the outer peripheral surface of the buried pipe can be reduced over the entire length of the pipe, and furthermore, the loss of the buried pipe due to the crack of the collar can be suppressed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an example of a buried pipe for propulsion method of the present invention, FIG. 2 is a view taken along the line II in FIG. 1, and FIG. 3 is a shape of a reinforcing ring used for the buried pipe. 4 is an enlarged sectional view showing another example of the reinforcing ring, and FIG. 6 is a partially cutaway side view of the conventional buried pipe for propulsion method. . 10 ... Tube, 11 ... Main body, 12a, 12b ... Insert, 13 ...
… Receptacle, 20 …… Collar, 20a …… Opening, 21 …… Collar body, 22 …… Reinforcing rib, 30 …… Reinforcing ring.

Claims (1)

[Scope of utility model registration request] 1. A buried pipe for a propulsion method, which is constructed by forming a horizontal shaft in the ground, connecting the insides of the horizontal shaft to each other, and sequentially propelling the hollow shaft, wherein each end outer peripheral portion is notched. And a tubular body having an insertion opening formed therein, and a receiving portion formed by being externally fitted to the insertion opening provided at one end of the tubular body, and the outer peripheral surface of the cylindrical main body extends over the entire length. A collar provided with extended reinforcing ribs, a reinforcing ring is attached to the tip of the collar on the outer peripheral side of the mouth, and the outer surface of the collar and the outer surface of the tubular body are continuous. The buried pipe for the propulsion method, which is characterized in that