JPS59161596A - Guide apparatus for small-bore pipe excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leading device for a small diameter tube propulsion machine.

The small-diameter pipe propulsion machine is designed as shown in Figure 1, and the problem is that the leading device a, which propels the compaction through the ground, and the trailing pipe are successively pressed and buried. The leading device of a small-diameter tube propulsion machine cannot be controlled in any direction, and as a result, the accuracy of burying the tube is poor, and therefore the tube can only be buried a short distance.

In FIG. 1, C is a propulsion jack installed in the starting shaft d, and e is a control unit.

The present invention has been developed in consideration of the above-mentioned problems, and it is possible to control the propulsion direction in any direction underground even with a small-diameter propulsion machine with a diameter of X The purpose is to provide a leading device for a small-diameter tube propulsion machine that can be constructed in a small size.

Embodiments of the present invention will be described below based on FIG. 2 and subsequent figures.

In the figure, reference numeral 1 denotes a leading tube, and this tip tube is a single cylinder 2, into which a piston 4a of a piston rod 4, which has a compression head 3 with an inclined tip surface fixed to the tip thereof, is fitted. 5a5b is a bottom side chamber of the cylinder 2 and a rod side chamber which are partitioned by the piston 4a of the piston rod 4. A spiral lead hole 6 is provided in the axial center of the piston rod 4.
A spiral reed rod 7 is screwed together. The spiral lead rod 7 is fixed to the rear end of the leading pipe 1. Reference numeral 8 denotes a detection rod which passes through the spiral lead rod 7 and whose tip is fixed to the piston rod 4, and the base of this detection rod g is slidable in the axial direction with respect to the input shaft 9aK of the angle detector 9. They are engaged and connected in the rotational direction. 1
0 is an auxiliary tube fixed to the rear side of the leading tube 1, and the angle detector 9 is fixed to this auxiliary tube 10. 11.12
are hydraulic pipes connected to both chambers 5a and 5b of the cylinder 2, and these hydraulic pipes 11 and 12 are connected to a hydraulic pump 14 via a control valve 13 provided on the starting shaft side through a subsequent pipe (not shown). It is.

Note that an intermittent switching valve 15 is installed in the hydraulic pipe 11 connected to the bottom side chamber 5a.

FIGS. 3A and 3B show an embodiment of the angle detector 9, which detects the rotation angle of the human power shaft 9a based on changes in electrical resistance.

The relationship between the spiral lead hole 6 and the spiral lead rod 7 of the piston rod 4 is such that the piston rod 4 rotates 3600 times when the piston 4a moves one stroke from the bottom side to the rond side (or the opposite direction). .

The angle detector 9 may be configured to directly detect the rotation angle of the piston 4a, but it may also be configured to detect the amount of movement of the piston 4a and convert the rotation angle from this amount of movement. good.

In the above configuration, by setting the intermittent switching valve 15 to the communication position and operating the operating valve 13 to alternately supply pressure oil to both chambers 5a and 5b of the cylinder 2, the piston rod 4 is moved relative to the leading pipe 1. It extends and contracts, and the spiral lead makes one rotation in one stroke of the extension motion, and one rotation in the opposite direction in one stroke of the shortening motion.
Rotate. Intermittent switching valve 1 during consolidation due to jacking
Leave 5 in the off position. The rotation angle of the piston rod 40 is detected by an angle detector 9.

The propulsion process of the guide device will be explained below.

(1) Example of the propulsion process when traveling straight (Fig. 4) (A) As shown in Fig. 4, the piston rod 4 is extended and retracted with the leading pipe 1 of the leading device located underground stopped [ (B)
, (C)], the consolidation head 3 reciprocates while rotating reciprocatingly, and a hole 16 is formed in front of the consolidation head 3 ((C)). Next, insert the leading pipe 1 along this hole 16.
The leading device is propelled by jacking it through the trailing tube 17. [Figure (D)].

Note that during the above operation, the leading device may be propelled by following the piston rod 4 with the piston rod 4 extended.

(2) Example of the propulsion process when correcting the direction. Use another method to know the position, inclination, etc. of the leading device in advance, and decide the direction in which you want to correct the direction. Then, the direction of the consolidation head 3 is set in the direction in which the direction is desired to be corrected. The direction of the consolidation head 3 is set by extending (or shortening) the piston rod 4 to give rotation to the consolidation head 3.

The set diameter intermittent switching valve 15 is placed in the disconnected position to block the hydraulic circuit. After the above settings, it is propelled from the starting shaft via the trailing pipe 17. FIG. 5 shows a case where it is desired to correct the direction downward, and by propelling in this state, the vehicle is propelled downward.

The present invention is as described above, and in a leading device for a small-diameter tube propulsion machine that is compactly propelled into the ground from a starting shaft via a trailing pipe 17, a cylinder 2 is provided in the leading pipe 1 constituting the leading device. A piston 4a having a piston rod 4 protruding from the cylinder 2 is fitted into the cylinder 2, and the piston 4a and the leading pipe 1 are connected by a spiral lead so that the piston 4a rotates one revolution or more when the piston 4a makes one stroke. An angle detector 9 is connected to the piston 4a to detect the rotation angle of the piston 4a,
Since the consolidation head 3 with an inclined end face is fixed to the tip of the above-mentioned piston rod 4, the propulsion direction can be controlled in any direction underground even if the propulsion device is small with a diameter of 150 or less, and can be propelled over long distances. It is possible to perform construction with small burial errors.

Furthermore, by applying rotational force to the piston 4a using a spiral lead, the diameter of the leading pipe 1 can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration explanatory diagram of a small diameter tube propulsion machine, Fig. 2 is a sectional view showing an embodiment of the invention, and Figs. 3 (A) and (B).
are wiring diagrams showing examples of angle detectors, Figure 4 (A), (
, B), (C), and (D) are explanatory views of the effect when the vehicle is traveling straight, and FIG. 5 is an explanatory view of the effect when the direction is corrected. 1 is a leading tube, 2 is a cylinder, 3 is a compression head, 4 is a piston rond, 4a is a piston, 9 is an angle detector, and 17 is a trailing tube. Applicant Komatsu Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] In a leading device for a small-diameter tube propulsion machine that is compacted and propelled into the ground from a starting shaft via a trailing pipe 17, a cylinder 2 is provided in a leading pipe 1 constituting the leading device, and a cylinder 2 is provided with a cylinder 2 that protrudes from the cylinder 2. A piston 4a having a sliding piston rod 4 is fitted, and the piston 4a and the leading pipe 1 are engaged with each other via a spiral lead that rotates one or more revolutions with one stroke of the piston 4a, and A small diameter tube propulsion machine characterized in that an angle detector 9 for detecting the rotation angle of the piston 4a is connected to the piston 4a, and a consolidation head 3 having an inclined end face is fixed to the tip of the piston rod 4. Leading device.