JPH0220310Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a pipe burying propulsion device for propelling a pipe body to be buried underground.

BACKGROUND ART Conventionally, as an excavator for burying a pipe body such as a small diameter pipe underground, there is one that employs a propulsion device shown in FIGS. 1 and 2. The above propulsion device is in the starting pit a
A pair of propulsion stands b parallel to each other are installed at a distance from each other, and a cylinder mounting stand d is provided on these propulsion stands b so as to be movable in the direction of propulsion of the tube c. A propulsion cylinder e is provided in the center of d, and the tube c is press-fitted into the ground by this propulsion cylinder e. In addition, a reaction force receiver f is provided at the rear of each propulsion platform b, and the reaction force during propulsion is received by the reaction force receiver f, and the cylinder mounting base d is sequentially moved forward as the tube body c is propelled. , the tube body c is repeatedly press-fitted. However, in such a propulsion device, since the tube c is propelled by the pressing force of the propulsion cylinder e, the propulsion cylinder e needs to be installed behind the tube c. Therefore, it is necessary to excavate the launching pit a with a length longer than the unit length l ₁ of the tube body c plus the length l ₂ of the propulsion cylinder e when extended, and it takes a lot of time to excavate and backfill the launching pit a. In addition to being expensive, there was a problem that it could not be carried out in places where there was no space to excavate a starting pit of the above length.

Purpose of the invention This invention was made with the aim of improving this problem, and provides a propulsion device for underground pipes that makes it possible to propel the pipe by simply excavating a starting pit slightly longer than the unit length of the pipe. The aim is to reduce the cost of excavating the starting pit.

Structure of the idea: Propulsion cylinders are installed on a pair of parallel propulsion tables installed in the launch pit, with the bottom side facing forward, and are buried between the tips of the piston rods that protrude rearward from each propulsion cylinder. A propulsion device for burying a pipe that makes it possible to bury the pipe by simply excavating a starting pit slightly longer than the unit length of the pipe by providing a push plate that presses the rear end of the pipe.

Embodiment An embodiment of this invention will be described below in detail with reference to the drawings shown in Figure 3 and below. It has a pair of parallel propulsion tables 3, and both ends of these propulsion tables 3 are supported on a pedestal 4 installed at the bottom of the starting pit 2. 5 is an adjustment rod screwed into the rear end of the propulsion platform 3;
It is in contact with a reaction force receiver 6 installed in close contact with the rear wall of the starting pit 2. Further, a plurality of pin holes 3a are bored at equal intervals along the longitudinal direction on the upper surface of the propulsion table 3, and a bottom end of the propulsion cylinder 7 is fitted into one of these pin holes 3a with a fixing pin. 8, it is detachably attached. The above-mentioned propulsion cylinder 7 is provided for each propulsion table 3, and is provided on each propulsion table 3 so that the bottom side is located forward in the starting direction of the tube body 10 and the piston rod 7a is located at the rear. The tip of the piston rod 7a of the propulsion cylinder 7 is fixed to both ends of the push plate 9. As shown in FIG. 5, the push plate 9 is provided with a circular receiving seat 9a in the center thereof, against which the rear end of the tubular body 10 comes into contact. is now being propelled underground.

Effects of the invention As detailed above, this invention
A propulsion cylinder 7 is provided for each propulsion table 3 on the propulsion table 3 installed in the interior with the bottom side facing forward, and a push plate 9 installed between the piston rods 7a of the propulsion cylinders 7 With the shortening of tube body 1
Each propulsion cylinder 7
It is not necessary to provide a rear part of the pipe body 10. The length l of the starting pit 2 to be excavated by this means that the length l of the starting pit 2 to be excavated is
Since the unit length of 0 only needs to be slightly longer than _l1 , the cost required for excavation and backfilling can be reduced, and the starting pit 2 can be excavated even in narrow spaces, so there are no restrictions on where it can be implemented. You can do less. Furthermore, since the stroke of the propulsion cylinder 7 can be increased within the range of unit length _l1 of the tube body 10, the distance that can be propelled at one time can be increased compared to conventional propulsion devices, and this allows the set position of the propulsion cylinder 7 to be increased. Work efficiency is also improved because the number of changes can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional propulsion device, Fig. 2 is a side view of the same, Fig. 3 is a plan view of a propulsion device that is an embodiment of this invention, Fig. 4 is a side view of the same, and Fig. 5 is a plan view of the propulsion device of the conventional propulsion device. It is a front view of the same. 2 is a starting pit, 3 is a starting platform, 3a is a pin hole,
7 is a propulsion cylinder, 7a is a piston rod, 8 is a pin, 9 is a push plate, and 10 is a tube body.

Claims (1)

[Scope of utility model registration request] At least a pair of propulsion tables 3 are provided parallel to each other along the propulsion direction of the tube body 10 to be buried in the launch pit 2, and on these propulsion tables 3, the bottom side faces forward, and a A propulsion cylinder 7 is removably attached to one of the plurality of pin holes 3a bored through a pin 8, and these propulsion cylinders 7
A push plate 9 that presses the rear end of the tube body 10 to be buried between the tips of the piston rod 7a that protrudes further rearward.
A propulsion device for underground pipes that is equipped with a.