JPH0738472Y2 - Thrust detection 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 thrust detecting device for a small diameter pipe propulsion machine that detects a propulsive force applied to a small diameter pipe propelled in the ground together with an excavating head.

(Prior Art) Conventionally, in a small-diameter pipe propulsion machine in which a small-diameter pipe is buried in the ground, by propelling a small-diameter pipe with an excavating head attached to the tip from the starting stand to the reaching stand, After the pilot pipe is propelled in advance from the starting shaft to the reaching shaft by adopting the buried propulsion method, a small diameter pipe is connected to this pilot pipe through the drilling head, and the pilot pipe is guided. There are some that have adopted a propulsion method of burying by promoting a small diameter pipe.

In either case, a large propulsive force acts on the small diameter pipe during propulsion.Therefore, install a thrust meter in the hydraulic circuit of the propulsion device installed in the starting stand, and check the thrust meter to determine the allowable load capacity of the small diameter pipe. The propulsion force is controlled so that the above propulsion does not work, and the small-diameter pipe is propelled.

(Problems to be solved by the invention) However, in the conventional small-diameter pipe propulsion machine, the thrust is detected by the thrust meter provided in the hydraulic circuit of the propulsion device. , The sum of the frictional forces between the outer peripheral surface of the small diameter pipe and the soil, or the sum of the frictional forces between the pilot pipe and the soil, the compression force applied only to the small diameter pipe could not be detected.

For this reason, when the types of small-diameter pipes to be buried are diversified as in recent years, or when the burial distance becomes long, the above conventional detection method often applies a thrust more than the allowable load capacity to the small-diameter pipes. As a result, there was a problem such as breakage of the small diameter pipe during propulsion.

Further, as shown in Japanese Patent Publication No. 62-6079, it is known to detect the axial load applied only to the excavating head, but in order to know whether the rotational vibration of the head is attenuated by the thrust of the propulsion jack. The load on the head side is measured in the above, and since the strain gauge described in the publication is installed on a small diameter rod for strain measurement, there is a problem that the small diameter rod cannot withstand burying a pipe with large thrust. There is.

The present invention was made in order to improve the above-mentioned inconvenience, and provides a thrust detection device for a small-diameter pipe propulsion machine capable of detecting the thrust applied to a small-diameter pipe, so that the embedded pipe (propulsion pipe) has an allowable load capacity. The purpose of this is to determine whether or not the force is within the range of force, control the thrust, and prevent damage to the small diameter pipe during propulsion.

(Means and Actions for Solving the Problem) In order to achieve the above-mentioned object, this invention proposes a small-diameter pipe propulsion in which a small-diameter pipe to be buried is propelled into the ground together with an excavating head by a propulsion device installed on a starting and standing shaft. In the machine, a thrust detecting device main body is provided between the excavating head and the small diameter pipe for detecting the reaction force of the excavating head and the propulsive force of the small diameter pipe by the propulsion device, and the thrust detected by the main body is started and launched. It is displayed on the thruster installed on the side and the thrust of the propulsion device is controlled based on this display so that it does not exceed the allowable load capacity of the small diameter pipe. A thrust detection device for a small-diameter pipe propulsion machine that is capable of propulsion.

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

FIG. 1 shows a small-diameter pipe 2 with a drilling head 1 attached to the tip,
This figure shows a state in which the propulsion device 4 installed on the starting stand 3 is propelling it toward the reaching stand 5 and the thrust of the present invention is applied to an adapter (not shown) that connects the drill head 1 and the small diameter pipe 2. A main body 6 of the detection device is provided to detect the reaction force of the excavation head 1 and the propulsion force of the small diameter pipe by the propulsion device 4.

The thrust detected by the main body 6 of the thrust detecting device is displayed on the thrust meter 8 provided on the operation panel 7 of the propulsion device 4.

In addition, 9 is a cutter oil pressure gauge, 10 is a thruster for the original push jack,
11 is a thrust adjustment knob.

On the other hand, as shown in FIGS. 2 and 3, after the pilot pipe 14 is previously propelled by the starting stand 3 toward the reaching stand 5, the pilot pipe 14 is connected to the small diameter pipe 2 via the excavation head 1. In another embodiment in which the caliber pipe 2 is propelled, a cutter head 15 is provided at the tip of the excavation head 1 as shown in FIG. 4, and the earth and sand excavated by the cutter head 15 is cut by the cutter head 15. After being taken into, the screw conveyor 13 provided in the pilot pipe 14 conveys it to the side of the reaching and standing wheel 5.

The body 6 of the thrust detecting device is attached to an adapter 16 that connects the excavating head 1 and the small diameter pipe 2.

The adapter 16 has a cylindrical shape and has an annular portion 16 on the inner peripheral surface.
a is projectingly provided, and the main body 6 is attached to the side surface of the small-diameter pipe 2 of the annular portion 16a by a fastener 17.

The main body 6 has an annular shape as shown in FIG. 6, and is interposed between the annular portion 16a and the receiving plate 18 abutting on the end face of the small diameter pipe 2, and the excavating head 1 and the small diameter pipe are connected. When the pipe 2 is propelled, the propulsive force acting between them is detected, and the operation panel 7
It is designed to be displayed on the thrust meter 8 provided in the.

If the small-diameter pipe 2 has a small allowable load capacity such as a vinyl chloride pipe and a thrust cannot be directly applied to the small-diameter pipe 2, a thrust pipe 19 is provided in the small-diameter pipe 2 as shown in FIG. In this case, the main body 6 is provided between the annular portion 16a of the adapter 16 and the receiving plate 18 fixed to the slide tube 19.
The thrust applied to the thrust pipe 19 is detected.

Next, the operation will be described. The propulsion method and the second method shown in FIG.
In any of the following propulsion methods, when the excavation head 1 and the small diameter pipe 2 are propelled into the ground, the thrust detection device main body 6 interposed between the excavation head 1 and the small diameter pipe 2 is The thrust applied to the small diameter pipe 2 via the excavation head 1 is detected.

This thrust is sent to the operation panel 7 provided on the side of the starting and standing shaft 3 via the cable 21 and displayed on the thrust meter 8.

Therefore, the operator controls the propulsion device 4 so that the difference between the thrust displayed on the thrust meter 8 and the thrust displayed on the thrust jack thrust meter 10 is less than the allowable load bearing capacity of the small diameter pipe 2. The small-diameter pipe 2 can be propelled without damage.

Further, by using the thrust pipe 19 as shown in FIG. 8, it is possible to propel a small-diameter pipe 2 having a low permissible load bearing capacity such as a hard vinyl chloride pipe without damage.

(Effect of the Invention) As described in detail above, the present invention provides a thrust detecting device main body between the excavating head propelled into the ground and the small-diameter pipe, and the reaction force and the propulsion acting on the excavating head and the buried pipe. Since the propulsive force of the small-diameter pipe by the device is detected, the propulsive force obtained by adding the thrust and reaction force of the original push jack can be known. You can know the size of.

Therefore, it becomes possible to control the propulsion force so that the thrust detected from the magnitude of the reaction force does not exceed the permissible load capacity of the small diameter pipe, and even a small diameter pipe with a low permissible load bearing capacity will not be damaged. Not only can it be propelled, it can also be propelled over long distances and the embedding of various small diameter pipes easily.

Further, since the thrust acting on the small-diameter pipe can be grasped, the injection amount of the lubricant to be injected in order to reduce friction can be minimized, which is economical.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIGS. 1 to 3 are explanatory views of a propulsion method, FIG. 4 is an enlarged view of a drilling head, FIG. 5 is an enlarged view in a V circle of FIG. FIG. 6 is a perspective view of the thrust detecting device main body, FIG. 7 is a front view of the operation panel, and FIG. 8 is an explanatory view showing another embodiment. 1 ... Excavation head, 2 ... Small diameter pipe 3 ... Starting resistance, 4 ... Propulsion device 6 ... Thrust detection device main unit, 8 ... Thrust meter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Hagiwara Hideo Hagiwara 1-6 Minamishinozaki, Kazo-shi, Saitama Komatsu Zenoa Corporation Construction Machinery Division (56) Reference JP-A-58-117432 (JP, A) Sho 60-173290 (JP, A) JP 60-173291 (JP, A) Actual development Sho 51-18012 (JP, U) JP 62-6079 (JP, B2)

Claims (2)

[Scope of utility model registration request] 1. A small-diameter pipe propulsion machine for propelling a small-diameter pipe 2 to be buried into a ground together with an excavating head 1 by a propulsion device 4 installed in a starting shaft 3, wherein the excavating head 1 and the small-diameter pipe 2 are provided. In between, a main body 6 of a thrust detection device for detecting the reaction force of the excavation head 1 and the propulsive force of the small diameter pipe by the propulsion device 4 is provided, and the thrust detected by the main body 6 is provided on the starting shaft 3 side. A thrust detection device for a small-diameter pipe propulsion machine that displays a total of 8. 2. A small-diameter pipe 2 having a low allowable load-bearing capacity, wherein a thrust detecting device main body 6 is provided between a thrust pipe 19 provided inside the small-diameter pipe 2 and the excavating head 1. Thrust detector.