JPH0738471Y2 - Propulsion device for small diameter pipe propulsion machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a propulsion device for a small-diameter pipe propulsion machine in which a propulsive reaction force is directly supported by a standing rear wall.

(Prior Art) (a) Conventionally, in a small-diameter pipe propulsion machine for burying a small-diameter pipe in the ground, a propulsion device is installed in a starting stand, and a small-diameter pipe to be embedded by this propulsion device (including (Pilot pipe) to the ground.

As shown in FIG. 4, the propulsion device is provided with a jack b on a mount a, and the propulsion jack b is adapted to propel a small-diameter pipe into the ground. Is supported on the rear wall e of the starting and standing d via the mount a.

(B) Further, as disclosed in Japanese Utility Model Laid-Open No. 61-169197, the buried pipe pressing jack and the member integrated with the pedestal are connected by a connecting member, and the rear end of the guide member is attached to the rear wall. The one in which the reaction force of the jack when pressing the buried pipe by abutting is received by the reaction force wall by the guide member through the connecting member, or (c) Furthermore, the actual open sho 49-142710, the actual open sho As shown in Japanese Patent Publication No. 49-135108, the buried pipe pressing jack and the guide member integrated with the gantry are connected by a connecting member, and the rear end of the gantry is brought into contact with the rear wall of the starting stand. There is.

Therefore, it is also known that the reaction force of the jack when pressing the embedded pipe is received by the rear wall by the mount via the connecting member and the guide member.

(Problems to be solved by the invention) In the case of the above (a), the pedestal a needs to have a strong structure to withstand an excessive propulsion reaction force, so that it is heavy and installed in the starting stand d. However, there is a problem that it takes a lot of time and effort to collect.

Further, in Japanese Utility Model Laid-Open No. 61-169197 of (b) above, the gantry and the guide member are integrated, and the guide members on both sides are connected by a connecting member.

Therefore, when the rear wall is elastically deformed by the reaction force, a load is applied to the gantry because the gantry and the guide member are integrated.

Therefore, the pedestal must be strong.

If the left and right elastic deformations of the rear wall differ depending on the magnitude of the left and right reaction forces, the pedestal and the guide member are distorted because the guide members are connected.

Further, when the contact state between the guide member and the rear wall is improperly adjusted at the initial stage and one-sided contact occurs, the same problem as described above occurs.

Furthermore, the above-mentioned (c) No. 49-142710, No. 49-1351.
In the technique disclosed in Japanese Patent Publication No. 08, the pedestal and the rear wall are in contact with each other, so that the pedestal is always under load, and the same problem as described above occurs.

Further, since the guide member is U-shaped, even when different reaction forces are generated in the left and right guide member portions, the same problem as described above occurs.

The present invention has been made for the purpose of improving the above problems, and an object of the present invention is to provide a propulsion device for a small-caliber pipe propulsion machine in which a reaction force is not applied to the frame and the guide rod is not distorted. It is a thing.

(Means and Actions for Solving the Problems) In order to achieve the above-mentioned object, the present invention proposes a small-diameter pipe propulsion in which a small-diameter pipe to be buried is propelled into the ground by a propulsion device installed in a launching stand. In the apparatus, the main body of the propulsion device is composed of a plurality of guide rods supported by a frame, and a propulsion jack for propelling a small-diameter pipe on these guide rods, and a propulsion chuck for fixing the propulsion jack to the guide rods. The guide rods are slidable in the front-rear direction with respect to the frame, and the guide rods are individually supported, and the rear ends of the guide rods are supported by reaction force receiving plates. By providing a propulsion device for a small-diameter pipe propulsion machine that prevents the reaction force from being applied to the gantry by directly supporting it on the rear wall of the launch stand, it is intended to simplify and reduce the weight of the gantry. is there .

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 is a main body of a propulsion device installed in a launching stand 2, and has two guide rods 6 arranged in parallel in the propulsion direction of the small diameter pipe 3, and these guide rods 6 are mounted on a pedestal 5 It is supported by.

Both ends of the guide rod 6 are supported by brackets 7 provided on the upper ends of both ends of the frame 5.

As shown in FIG. 3, the bracket 7 has a structure in which it is vertically divided into two parts, and the inner diameter of the hole 7a for supporting the guide rod 6 is slightly larger than the outer diameter of the guide rod 6, whereby each guide rod 6 is supported. 6 can be individually slid in the front-back direction.

A reaction force receiving plate 8 is interposed between the rear end of these guide rods 6 and the rear end 2a of the starting stand 2.

The reaction force receiving plate 8 is supported by two bolts 9 provided on the upper portion of the bracket 7 so that the rear surface is in contact with the rear wall 2a, and can be slid when the rear wall 2a is bent. At the same time, a concave spherical concave portion 8a with which the rear end of the guide rod 6 abuts is formed on the front surface.

On the other hand, each of the guide rods 6 is provided with a propulsion jack 10 and a propulsion chuck 11 connected in the front-rear direction.

As shown in FIG. 2, the propulsion jack 10 has a cylindrical piston 10a having a guide rod 6 penetrating through the central portion thereof, and the piston 1
And a cylinder portion 10b that accommodates 0a,
It can slide back and forth along the guide rod 6,
Pressure chamber in cylinder part 10b divided by piston 10a
The hydraulic pressure can be supplied to the insides of 10c and 10d by the pipe line 12.

A pressing plate 13 is fixed between the front ends of the pistons 10a, and the small-diameter pipe 3 supported between the guide rods 6 is connected to the pistons 10 of the propulsion jack 10 via the pressing plates 13.
a is supposed to propel, at this time propulsion chuck 1
1 chucks the guide rod 6.

As shown in FIG. 2, the propulsion chuck 11 has a conduit 14 inside a cylinder 11a connected to the cylinder 10b of the propulsion jack 10.
It has a chuck member 11b which is operated by the supplied hydraulic pressure, and the chuck member 11b chucks the guide rod 6 so that the propulsion jack 10 can be fixed to the guide rod 6.

Next, the operation will be described. First, the propulsion jack 10 and the propulsion chuck 11 are retracted as shown in FIG. 1 and FIG.
The small-diameter tube 3 to be propelled is set on the front side of the pressing plate 13.

Next, when the hydraulic pressure is supplied to the propulsion jack 10 and the guide rod 6 is chucked, the hydraulic pressure is supplied to the pressure chamber 10d at the rear end of the propulsion jack 10 to advance the piston 10a, and the pressing plate 13 fixed to the piston 10a is used. , The rear end of the small diameter pipe 3 is pressed to propel the small diameter pipe 3 into the ground.

Further, the propulsion reaction force A generated at this time is transmitted from the propulsion chuck 11 to the guide rod 6, and is further directly supported from the rear end of the guide rod 6 via the reaction force receiving plate 8 by the rear wall 2a of the start-up / resistor 2, Moreover, since the gantry 5 and the guide rod 6 are slidable, no propulsive reaction force acts on the gantry 5.

On the other hand, when the propulsion for one stroke by the propulsion cylinder is completed, the propulsion chuck 11 is released, the propulsion cylinder 10b is shortened, the propulsion jack 10 is advanced, and the guide rod 6 is chucked again at that position to reduce the propulsion cylinder 10b. The caliber tube 3 is propelled.

After the above operation is repeated until the propulsion jack 10 reaches the front end of the guide rod 6, the small diameter tube 3 is propelled, the propulsion cylinder 10b is retracted to the original position, a new small diameter tube 3 is set, and the above operation is repeated. Therefore, the small-diameter pipe 3 can be efficiently propelled.

(Effect of the Invention) As described in detail above, the present invention is configured such that the reaction force for propelling a small-diameter pipe is directly supported by the rear wall of the starting and standing force through the id rod, so that the conventional mount is used. It is not necessary to make the gantry a strong structure that can withstand an excessive propulsion reaction force, as compared with the one supported by the rear wall via the.

As a result, the weight of the entire apparatus can be reduced, so that it is possible to easily perform the work of installing it on the starting stand and recovering it from the starting stand, and also simplifying the structure to facilitate maintenance.

Further, since the guide rod is slidable with the base during the propulsion, the reaction force of the jack applied to the guide rod is not transmitted to the base.

Therefore, since the position of the gantry does not shift, the central portion of the small-diameter pipe can always be pressed and propelled, which also has the effect of enabling accurate propulsion.

Furthermore, since the guide rods on both sides are individually slidably mounted on the gantry, even if the jack reaction forces on both sides differ due to changes in the soil condition in front of the buried pipe, each guide rod is independent. Slides and the pedestal is not distorted.

Further, no adjustment is required to bring the guide rod into contact with the rear wall.

This is because the guide rod slides, so that it slides rearward under a reaction force and naturally contacts the rear wall.

Therefore, the installation is easy.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a plan view, Fig. 2 is a partially cutaway side view, Fig. 3 is a view taken along the line III-III in Fig. 1, and Fig. 4 is conventional. FIG. 1 …… Main body, 2 …… Starting resistance 2a …… Rear wall, 3 …… Small diameter tube 5 …… Stand, 6 …… Guide rod 8 …… Reaction force receiving plate, 10 …… Propulsion jack 11 …… Propulsion Chuck

Claims (1)

[Scope of utility model registration request] 1. A small-diameter pipe propulsion device for propelling a small-diameter pipe 3 to be buried into the ground by a propulsion device installed in a starting shaft, wherein the main body 1 of the propulsion device is supported on a mount 5. A propelling jack (10) configured by a plurality of guide rods (6) for propelling the small-diameter pipe (3) on these guide rods (6) and a propulsion chuck (11) for fixing the propelling jacks (10) to the guide rods (6) are movable in the longitudinal direction of the guide rods (6). The guide rod 6 is slidable in the front-rear direction with respect to the frame, and the guide rods 6, 6 are separately supported, and the rear end of the guide rod 6 is provided with a reaction force receiving plate 8 therebetween. A propulsion device for a small-diameter pipe propulsion machine that is directly supported by the rear wall 2a of the starting shaft 2.