JPH01153882A - Pipe drawing device - Google Patents

Abstract

PURPOSE: To prevent the self-rotation of a pipe by providing a pipe box, a central connecting body, a leading-in drilling member comprising connecting plates, a hydraulic cylinder for drilling and a pipe joint, a taper head, a hydraulic drive circuit and a rotation meter. CONSTITUTION: A central connecting body 10 is formed by a pipe box 11 for contacting the pipe for leading-in the pipe embedded in the pipe pushing process, and pipe contacting members 14, 14' arranged at the front and rear ends thereof. A leading-in drilling member 20 is formed by connecting plates 21 arranged at the front and rear ends of the pipe box 11, a hydraulic cylinder 22 for drilling mounted as one piece on both sides of the central connecting body 10 via the connecting plates 21 parallel to it, and a pipe joint 23 at the rear side thereof. On the head of the hydraulic cylinder 22 for drilling are provided a taper head 22', a hydraulic drive circuit for driving it and a rotation meter for detecting the rotating torsion angle in the lead-in drilling. Consequently, a plurality of pipes can be embedded in predetermined positions without rotating torsion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe lead-in device used for burying a pipe body in the soil using a pit provided in the soil.

[Conventional technology]

When burying a pipe in the soil, excavate it from the ground to a specified depth, or create a pit at an appropriate location without excavating from the ground, or from one side, or in places where there is no need for a pit due to topography. Generally, a construction method is adopted in which the pipe bodies are sequentially buried by excavating or perforating holes in a predetermined direction from an appropriate position.

One such conventional burial method involves penetrating a single pipe into the soil from one pit with a drilling machine attached to the top in conjunction with a pusher, and when the pipe advances to the other pit. Therefore, the perforator was removed, and in order to draw the plurality of pipes in the opposite direction to the above, a pipe drawing device, which is a combination of a plurality of perforators, was attached to the head of the single buried pipe. A construction method is already known in which a plurality of pipe bodies are buried in the soil by linking a pipe lead-in device with an extrusion device and drawing the pipes in the opposite direction.

The main push device holds the base of the tube during the drilling process to stop the reaction force received from the soil when the drilling machine enters the soil, and after the drilling machine has advanced a predetermined short distance, the drilling machine position When pulling the tubular body up to the point where the main pushing device is located, a movable body installed in that part presses and moves the tubular body in conjunction with the pulling operation of the punching machine.
The tube body is buried by repeating such drilling and pulling operations.

[Problem that the invention seeks to solve]

However, the pipe pulling device used in the conventional pipe burying method described above has multiple sets of perforators integrated into the frame in order to pull in and bury multiple pipes. When each drilling machine performs a drilling operation, the reaction force that each drilling machine receives from the soil is not equal due to various factors such as the nature and hardness of the soil, so there is a problem that the pipe pulling device as a whole rotates and becomes twisted. .

Naturally, when the pipe pulling device rotates, since multiple pipe bodies are connected behind the pipe pulling device, the pipe bodies twist, and when the pipe body reaches the starting pit, the state is the arrival pit. An inconvenience arises in that the arrangement of the tubes is different from that of the arranged tubes.

This invention was made in view of the current state of technology regarding pipe drawing devices used in the conventional pipe burying method, and its purpose is to provide a tapered head in the form of an hour wheel at the tip of the cylinder of the conventional pipe drawing device. It is an object of the present invention to provide a pipe drawing device which prevents its rotation by providing the pipe drawing device.

[Means for solving problems]

Therefore, as a means for solving the above-mentioned problems, the present invention provides a central connecting body comprising a piping box and pipe body connection parts at its front and rear ends for connecting to the pipe body for drawing the pipe buried in the pipe propulsion process. A drilling propulsion device consisting of a connecting plate provided at the front and rear ends of the piping box, a drilling hydraulic cylinder integrally attached to both sides of the central connecting body through connecting plates parallel to the connecting plate, and a pipe connecting portion attached to the rear of the hydraulic cylinder. a taper head attached via a guide pipe provided at the head of the drilling hydraulic cylinder; a hydraulic drive circuit capable of independently driving the drilling hydraulic cylinder; A configuration was adopted that included a tachometer installed to detect the rotational torsion angle inside.

[Effect]

The pipe lead-in device configured as described above is used in the latter of the pipe embedding methods, ie, the combination of the pipe thrust method and the pipe pull-in method. Therefore, first, we will explain the pipe propulsion method that is the premise.

FIG. 5 is a diagram explaining the tube propulsion method. Reference numeral 1 denotes a main push device, which is installed at an appropriate position within the starting pitch P+. A movable body 2 is provided inside the original pushing device 1 and holds the base of the tube body 3.

Tube bodies 3 of appropriate lengths are sequentially connected to the rear as the drilling position progresses. A drilling machine 4 is attached to the tip of the tube body 3, and a hydraulic cylinder 41 for drilling is provided at the head thereof. Pz is the achieved focus. Hydraulic pressure is supplied to the main pushing device 1 from a hydraulic source 6 via a hydraulic hose X in accordance with a command from a control panel 5, and is controlled by a signal cable Y.

The drilling machine 4 and its hydraulic cylinder 41 inserted from the starting pit P are fixed so that the movable body 2 does not move relative to the main pushing device 1 while holding the root of the pipe body 3 during drilling work. In this state, hydraulic pressure is sent to the hydraulic cylinder 41, and the head of the hydraulic cylinder 41 extends in the direction of the arrow, thereby being press-fitted into the soil. Therefore, the reaction force that the hydraulic cylinder head receives from the soil during this press-fitting is stopped by the original pushing device 1. When the hydraulic cylinder 41 extends to its maximum stroke, the hydraulic cylinder 41 then operates on the contraction side, leaving its head position unchanged. At this time, the hydraulic cylinder 41
Simultaneously with the compression side operation of the main push device 1, the movable body 2 of the main push device 1
Press the tube body 3 at the base in the direction of the arrow to help the hydraulic cylinder 41.

In this way, the hydraulic cylinder 41 and the original pushing device work together to repeatedly expand and contract like a scooping insect, and sequentially send the tube body 3 in the direction of the arrow without removing soil. When the perforation 14 is exposed to the reaching point Pg, the tube propulsion method ends, and the perforation machine 4 is removed.

Next, the pipe lead-in construction method shown in FIG. 6 is started, and the pipe lead-in device 7 according to the present invention is used in this construction method. As shown in the figure, in this construction method, the pipe pulling device 7 is pulled in the opposite direction to the pipe propulsion construction method described above, and hereinafter, the direction of the arrow will be referred to as the forward direction.

First, after drilling a4, which was removed after the pipe propulsion method was completed,
Attach the front end of the pipe lead-in device 7. This attachment takes place via a tube connection at the front end of the central connector. The pipe drawing method performs drilling work through the upper and lower hydraulic cylinders of the pipe drawing device and the taper head provided at its head, and the main pushing device 1 is linked to pull the hole in the forward direction as in the pipe body pushing method. A plurality of pipe bodies connected to the rear end of the pipe drawing device 7 are buried.

In this pipe lead-in construction method, the properties and hardness of the soil vary depending on the location, so if drilling is performed with the heads of the hydraulic cylinders protruding the same length at the same time as in conventional pipe lead-in equipment, the upper and lower hydraulic cylinders will The reaction force from the soil that the head receives is different, causing the pipe pulling device to rotate and twist as a whole. This is because only the cylinder head receives reaction force from the soil.

On the other hand, in the pipe lead-in device according to the present invention, the upper and lower
Each of the two hydraulic cylinders is equipped with a hydraulic drive circuit that can be driven independently, and the taper head provided on the head of the hydraulic cylinder is such that when only one side plate is protruded, the reaction force from the soil is reduced by the taper head. Normally, two hydraulic cylinders are operated to move the taper head at its maximum stroke length to move the hole, but if the reaction force from the soil comes to different places on the top and bottom, the pipe pulling device The overall rotational twist is detected by a tachometer, and depending on the rotational twist angle of the signal, one of the two taper heads will protrude to a predetermined length that is less than the maximum stroke, and the other will protrude to the maximum stroke. A command is given to the hydraulic control circuit to increase the reaction force from the soil caused by the taper head.

In this way, when one taper head is made to protrude from the other to correct the rotational twist, the other taper head is then also made to protrude to its maximum stroke to perform the drilling operation.

Next, as in the past, the two hydraulic cylinders are linked with the movable body of the main pushing device and contracted to accurately transfer the tube behind them in a predetermined direction, and by repeating this, multiple tubes are will be buried.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an overall schematic view of an embodiment of the pipe drawing device according to the present invention, viewed from the longitudinal side.

This pipe drawing device includes a central connecting body 10 for connecting this device to a pipe body for drawing pipes buried in a pipe propulsion process to be described later, and double-acting hydraulic cylinders for drilling holes on both sides of the central connecting body 10 in parallel with the central connecting body 10. A hydraulic cylinder head 20' for drilling provided at the head of the hydraulic cylinder for drilling, and a tachometer for detecting the rotational torsion angle during retraction of the drilling. It consists of 30.

The central connection 10 comprises a piping box 11 in which two manifolds 12, 13 are provided,
Hydraulic piping is connected to the extension side boat and contraction side boat of the double-acting hydraulic cylinder.

High pressure oil is sent to this hydraulic piping from a hydraulic hose X.

The piping box 11 has pipe connection parts 14 at its front and rear ends.
．． 14' is provided. The tube body connection portion 14 at the front end is a member for connecting to a tube body for drawing a pipe, and the tube body connection portion 14' at the rear end is for connecting to a tube body to be buried.

The perforation lead-in section 20 includes two connecting plates 21 attached to the front and rear ends of the piping box 11 at right angles thereto, and is provided parallel to the main body on both sides of the central connecting body 10 between them. It consists of two double-acting hydraulic cylinders 22 for drilling, and a tube connection part 23 attached to the rear thereof. Hydraulic piping is provided from the manifolds 12 and 13 of the piping box 11 to the expansion side port 24 and line side port 25 of the hydraulic cylinder 22 for drilling, respectively.

Furthermore, the drilling hydraulic cylinder head 20' provided at the head of the double-acting hydraulic cylinder 22 for curved drilling is connected to the guide pipe 2.
1' and a tapered head 22' provided so as to be freely guided by the tapered head 22'.

FIG. 2 is a cross-sectional view taken along the line ■-■. A tachometer 30 is provided at a suitable position on the substrate 11' of the piping box 11, and a signal cable Y passing through the arrangement box 11 and running parallel to the hydraulic hose X is connected to this tachometer 30.

The operation of this embodiment configured as described above is shown in FIGS. 3 and 4.
This will be explained with reference to the figures.

FIG. 3 is a diagram illustrating a method of operating the hydraulic cylinder of the pipe drawing device of this embodiment. When the tube propulsion process is completed,
As shown in Fig. 3, the central connecting body 10 of the tube drawing device is connected to the head of the tube exposed at the reaching focus, and the hydraulic cylinder 22 is operated to move the tube drawing device in the opposite direction to the tube propulsion process. Move the hole and perform the pipe drawing process.

Before starting this tube drawing step, the tube to be buried is connected to the tube connecting portions 14' and 23 on the opposite side from the tube buried in the tube advancing step.

As the tube drawing process progresses, tubes of a predetermined length are sequentially connected to the rear of these tubes.

During the pipe drawing process, the reaction force received from the soil against the upper and lower hydraulic cylinder heads of the pipe drawing device may differ depending on the location, as the soil properties and hardness vary depending on the location. It may rotate and twist. When this rotational twist occurs, the tachometer 30 senses the rotational twist, and a signal thereof is sent via the signal cable Y to an electronic control device (not shown). Then, in order to correct the rotational torsion, this electronic control device instructs to send pressure oil to the hydraulic cylinder 22 for drilling, either the upper or lower one, which has less reaction force from the soil. Figure (8
), the upper tapered head 22' is made to protrude longer than the lower one. In the opposite case, the lower tapered head 22' is made to protrude long as in the third opening.

When the rotational twist that occurred during the drilling movement is corrected in this way, the shorter taper head 22' is further protruded, and both taper heads 22' are aligned to the maximum stroke length as shown in FIG. 3(C). .

Next, as in the past, the original pusher W (
In conjunction with a moving body (not shown), the two upper and lower hydraulic cylinders 22 simultaneously send pressure oil from the line side port 25 to move the entire pipe drawing device in the direction of the starting pit. By repeating this operation, the three tubes connected to the rear are moved and buried.

FIG. 4 shows a hydraulic control circuit for operating the hydraulic cylinders 22.
Two two-position directional control valves K are provided correspondingly to each of these. P is a hydraulic pump, and T is a drain tank.

In the illustrated case, the lower hydraulic cylinder is controlled so as to protrude toward the extension side, and the two-position directional control valve is provided as a solenoid valve, and is switched to the illustrated position by an electric signal from an electronic control device. and sends pressure oil from the pump P to the expansion side port 24.

At this time, the two-position directional control valve on the right is in the stop position, so the upper hydraulic cylinder is completely stopped.

When operating the lower hydraulic cylinder 22 toward the line side, this is done by switching the left two-position directional control valve K to the opposite position.

When the upper hydraulic cylinder is extended or contracted, the right two-position directional control valve K is operated in the reverse order to the above.

When operating the two upper and lower hydraulic cylinders simultaneously to the extension side, set the left two-position directional control valve K to the forward position, the right control valve to the reverse position, and when operating the opposite to the line side , switches the left control valve to the reverse position and the right control valve to the forward position.

〔effect〕

As explained in detail above, in this invention, taper heads are provided on the upper and lower perforating cylinder heads of the pipe lead-in device used in the pipe lead-in method, and the protrusion of these taper heads can be independently driven by a hydraulic drive circuit. Since we installed a tachometer to detect the rotational twist of the entire device,
Even if the entire device rotates and twists because the reaction force received in the soil differs for the upper and lower taper heads depending on the location due to differences in soil properties, hardness, etc., this rotational twist is detected by a tachometer. The hydraulic drive circuit is activated by the signal, and the one with the smaller reaction force of the upper and lower taper heads is extended to the maximum stroke so that the reaction force is received over the entire length of the taper head. Rotational twist can be corrected by balancing the reaction force. Therefore, according to this pipe drawing device, it is possible to bury a plurality of pipe bodies to be buried accurately in a predetermined position without causing rotational twisting in the soil.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of an embodiment of the pipe drawing device according to the present invention, Fig. 2 is a partial sectional view thereof, Fig. 3 is an explanatory diagram of the operation of the hydraulic cylinder, and Fig. 4 is a schematic system diagram of the hydraulic drive circuit. , FIG. 5, and FIG. 6 are diagrams for explaining the pipe propulsion method and the pipe drawing method of the managed construction method. 10...Central connecting body, 11...Piping box, 14.14'...Pipe connection part, 20.
...Retraction perforation part, 21 ...Connection plate, 22
...Hydraulic cylinder, 23...Pipe body connection part, 20'...Hydraulic cylinder head for drilling, 2
2'... Taper head. Patent applicant Sumitomo Electric Industries, Ltd. Nippon Telegraph and Telephone Corporation Agent Kama 1) Text - Figure 3 Figure 4

Claims (2)

[Claims] (1) A central connecting body consisting of a piping box and pipe connecting parts at its front and rear ends to connect to the pipe body for guiding the pipe buried in the pipe propulsion process, and a connecting plate provided at the front and rear ends of the piping box. A hydraulic cylinder for drilling is integrally attached on both sides of the central connecting body via a connecting plate in parallel with this, and a retractable drilling section consisting of a pipe connection section attached to the rear of the hydraulic cylinder, and a hydraulic cylinder for drilling provided at the head of the hydraulic cylinder for drilling. A hydraulic drive circuit capable of independently driving the taper head attached via a guide pipe and the drilling hydraulic cylinder, and a hydraulic drive circuit installed at an appropriate position of the central connector for detecting a rotational twist angle during retraction drilling. A pipe drawing device characterized by being equipped with a tachometer. (2) Two two-position direction controls provided in parallel corresponding to each hydraulic cylinder so that the hydraulic drive circuit can drive two double-acting hydraulic cylinders for drilling and these two hydraulic cylinders independently. A pipe drawing device according to claim 1, comprising a valve and a hydraulic pressure supply source for supplying a hydraulic pressure source to the valve.