JPH0649667Y2 - Buried pipe length correction device in pipe burial equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a buried pipe length correcting device in a pipe burying device.

(Prior Art) As a means for burying a pipe in the ground, generally, a front conduit is connected to the tip of the buried pipe, and a screw auger is inserted into a casing installed in the axial direction of these pipes to rotate the screw auger. 2. Description of the Related Art A pipe burying device is known in which the earth and sand excavated by driving is conveyed backward through a casing and is discharged to push an embedded pipe to bury it in the ground.

On the other hand, recently, for the purpose of laying underground such as water and sewage and telegraph and telephone cables, it is required to bury a small diameter pipe made of a soft material such as Teflon and vinyl chloride.

However, when this type of soft pipe is buried in the ground by a conventional pipe burying device, it is unreasonable in terms of the strength of the pipe itself. From this fact, a steel pipe that gives the thrust of the hydraulic jack for propulsion to the blade mouth is added and provided, and a duct that covers the steel pipe and fixes the tip to the blade mouth and connects to the vertical shaft side at the rear side is provided sequentially. There is one in which a soft pipe having a small diameter is buried by propulsion burying and penetrating the ground and then removing the steel pipe (see Japanese Patent Publication No. 59-45077).

By the way, in the above-mentioned device, since the thrust by the drive unit is always applied to the casing and the buried pipe is pulled in by propelling the casing, even if an attempt is made to adopt a swing structure for the casing to cope with bending, for example, It is difficult to swing the blade edge due to the tendency of straightening due to the thrust applied to it, and it is not possible to make a pipe burying device that enables curved excavation.

Therefore, the applicant of the present application divides the casing into a tip casing and a rear casing so that the joint portion is located at the axially intermediate portion of the leading conduit, and connects the casing so that the casing can swing. The outer periphery of the casing at the rear part and the inner periphery of the front conduit are joined by a transmission part so that the thrust applied to the casing is transmitted to the front conduit, and the rear end of the buried pipe is brought into contact with the pipe pushing part of the drive part. The pipe burying device was developed.

With the above configuration, the buried pipe is pushed into the ground in a state of being unrelated to the casing and the leading conduit, and therefore, even if the buried pipe is soft and has a small diameter, it can be buried in the ground without difficulty. Since the tip of the casing is separated from the leading conduit, the casing can be freely bent when the direction is corrected, and the path can be corrected easily and surely.

(Problems to be solved by the invention) However, in the above-mentioned device, as the propulsion extension of the buried pipe becomes longer, the errors in the individual lengths of the buried pipe are accumulated. The tip will hit the rear end of the leading conduit, which causes a problem that the buried pipe will buckle when the buried pipe is further pressed. Further, if the integration error is on the negative side, the front end of the buried pipe will be dislocated from the rear end of the front conduit, which causes a problem that it cannot follow the front conduit.

In view of this, the present invention has been made to solve the problems caused by the above-mentioned technique, and absorbs the error in the individual length of the embedded pipe, and the tip of the embedded pipe is always located at the predetermined position of the leading pipe. Another object of the present invention is to provide a buried pipe length correcting device in a pipe burying device which prevents the buried pipe from buckling or separating.

[Constitution of device]

(Means for Solving the Problem) As a means for solving the problems of the above-described conventional technology, the present invention is to contact the rear end of the buried pipe with the pipe pushing portion of the drive unit, and to connect the tip of the buried pipe to the rear end of the front conduit. Fit the end slidably in the axial direction,
In a pipe burying device for pushing and burying a buried pipe in the ground excavated by a leading conduit, on the leading conduit side, a detector for detecting the relative distance between the tip of the buried pipe and the leading conduit is provided, and this detector The present invention is characterized in that an expansion / contraction mechanism is provided for adjusting the relative distance between the rear end of the buried pipe and the pipe pushing portion based on the detection signal.

(Operation) During the burying work of the buried pipe, the relative distance between the tip of the buried pipe and the leading pipe is always detected by the position detector, and if the relative distance exceeds the allowable range, the expansion mechanism operates and the rear end of the buried pipe is operated. And the pipe pushing portion of the drive unit are adjusted so that the tip of the buried pipe is placed at a predetermined position of the leading conduit.

(Embodiment) Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

In the pipe burying device 1, a drive unit 4 is installed on a base 3 fixedly installed in a pit 2 excavated from the surface of the earth so that the drive unit 4 can be moved forward and backward, as shown in FIG. Is connected to a casing 5 and a screw auger 6 inserted into the casing 5, and the ground 10 is excavated by excavating the ground 10 by a blade opening 8 of a tip conduit 7 at the tip of the casing 5 and an excavating head 9 at the tip of the screw auger 6. The earth and sand are sent backward in the casing 5 by the blades of the screw auger 6, discharged from an unillustrated earth discharge port, and carried to the surface of the earth.

The drive unit 4 has a motor 11 for rotating the casing 5 and the screw auger 6, a propulsion cylinder 12 for pushing the drive unit 4, a buried pipe 13, and a pipe pushing unit 14 for pushing the pipe end of the casing 5, and the like. In this propulsion cylinder 12, the drive unit 4 is moved forward (leftward in the drawing) by extending the piston rod of the cylinder 12 with respect to the reaction force receiver 15 installed along the side wall surface of the pit 2. .

As shown in FIG. 3, a transmission portion 16 for transmitting the thrust of the casing 5 to the front conduit 7 is fixed to the casing 5, and the transmission portion 16 is a pressure receiving portion fixed to the inner circumference of the front conduit 7. The front conduit 7 is formed so as to be in contact with 17 and advance as the casing 5 advances. The transmission portion 16 may be connected by a bolt, a clamp, or the like, instead of being merely abutted.

The rear end of the front conduit 7 is fitted to the outer periphery of the front end of the buried pipe 13, and a sealing material 18 is interposed in the gap between the fitting parts to prevent intrusion of earth and sand. The thrust applied to the buried pipe 13 through the pipe pushing portion 14 is separated so as not to be transmitted to the leading conduit 7.

A detector 20 for detecting the tip position of the buried pipe 13 is provided inside the front conduit 7. In the illustrated embodiment, a detector 20 such as an optical sensor is supported using the pressure receiving portion 17, and a detection surface 21 is provided at the tip of the embedded pipe 13 so as to face the detector 20. Thus, the distance L between the detector 20 and the non-detection surface 21 is always detected.

On the other hand, the pipe pusher 14 of the drive unit 4 is composed of a plurality of pipes (3 in FIG. 3) arranged annularly on the pipe pusher 4 side as shown in FIGS.
A plurality of (3 in the figure) guide pins 23, 23, 23 fixedly mounted on the rear surface of the pipe pushing portion 14 are fixed to the drive portion 4. The expansion / contraction mechanism 26 is configured so as to be moved forward and backward by sliding with the guide holes 25, 25, 25 of the guide plate 24.

The buried pipe 13 referred to here is a soft pipe made of Teflon, vinyl chloride or the like, and is mainly intended for small diameter pipes of about 200 to 600φ. Stretching mechanism based on the detection result of the detector 20
The control mechanism of 26 is a detector as shown in FIG.
The detection signal of 20 is input to the comparator 27, which compares the distance to the tip of the buried pipe detected by the detector 20 by the comparator 27 with the preset allowable value. When this allowable value is exceeded, a signal is input to the servo valve 28. This servo valve 28 includes a hydraulic cylinder 22 of a telescopic mechanism 26,
Piping that communicates with the rod side and the base end side of 22, 22 respectively
When the distance L becomes shorter than the permissible value, the servo valve 28 is installed between 29, 30 and the pipes 33, 34 to the pump 31 and the tank 32, and hydraulic pressure is applied to the rod side of the hydraulic cylinders 22, 22, 22. To the supply side, and the pipe pushing portion 14 is retracted until the distance reaches the allowable value, and when the distance L becomes larger than the allowable value, the servo valve 28 causes the hydraulic cylinders 22, 22, 22 to the base side. The hydraulic pressure is switched to a position where the hydraulic pressure is supplied to the pipe pushing portion 14 and the pipe pushing portion 14 is moved forward until the distance reaches an allowable value.

If each hydraulic cylinder 22, 22, 22 is connected by a series of pipes 29, 30 as shown in the figure, even if the buried pipe 13 is displaced and an unbalanced load acts on a specific hydraulic cylinder 22, As shown in FIG. 6 (B), the other hydraulic cylinders 22, 22 are extended so that all the hydraulic cylinders 22, 22, 22 can push the buried pipe 13 with equal force. Reference numeral 35 in the figure is a pressure sensor for detecting the pushing force of the buried pipe 13, and the detection result is displayed on the pushing force display 36 so that the pushing force during work can be grasped.

Next, the operation of the above embodiment will be described.

In Fig. 2, the front conduit 7 is dug into the ground 10 and a new buried pipe is installed.
It shows a state in which 13 is connected between the drive unit 4 and the buried pipe 13 inserted into the ground 10 to continue the burying work.

Here, the motor 11 of the drive unit 4 is started to start the screw auger 6
When the propulsion cylinder 12 is actuated while being rotated, the ground 10 is excavated by the excavation head 9 and the blade 8 at the tip of the screw auger 6, and the excavated earth and sand moves backward in the casing 5 by the blades of the screw auger 6. Transferred and discharged.

When the rear end of the casing 5 is pushed forward by the forward movement of the drive unit 4 by the propulsion cylinder 12 through the pipe pushing unit 14, the transmission unit 16 of the casing 5 pushes the pressure receiving unit 17 of the front conduit 7 accordingly. The thrust is transmitted to the front conduit 7, and the front conduit 7 is propelled into the excavated ground 10 in the same amount together with the casing 5.

At this time, the rear end of the buried pipe 13 is also pushed through the pipe pushing portion 14 of the drive unit 4. However, since the buried pipe 13 has no force transmission relationship with the casing 5 and the front conduit 7, only the buried pipe 13 is pushed. Will enter after the advance of the leading conduit 7 by itself.

Therefore, the buried pipe 13 is pushed into the ground under almost no resistance, and even a small-diameter pipe made of a soft material can be buried without difficulty.

During the above work, the relative distance L between the surface to be detected 21 at the tip of the buried pipe 13 and the front conduit 7 is constantly detected by the detector 20, and the expansion mechanism 26 operates when the distance L exceeds the allowable value. Then, adjustment is made by advancing or retracting so that the distance L becomes an allowable value.

A potentiometer or a limit switch may be used as the position detector 20, and in addition to automatic control as in the present embodiment by the detection signal of the detector 20, the detector 20 detects a value outside the allowable value. At this time, an alarm may be issued and the hydraulic cylinders 22, 22, 22 may be manually expanded and contracted.

[Effect of device]

As described above, according to the present invention, since the relative distance between the tip of the buried pipe and the rear end of the front conduit can be kept within a predetermined range at all times, the tip of the buried pipe abuts against the front conduit. There is an excellent effect that the buried pipe can be reliably buried, because problems such as bending and the tip of the buried pipe being disengaged from the rear end of the leading conduit and being unable to be propelled are eliminated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a partial sectional view and a side view showing an example of a pipe burying device to which the present invention is applied, and FIG. 3 is an enlarged sectional view of the main part thereof. FIG. 4 is an enlarged side view with a partial cross section showing an example of an expansion and contraction mechanism of the pipe pushing portion, FIG. 5 is an explanatory view showing an example of arrangement of the hydraulic cylinder and guide pins, and FIG. 6 (A). , (B) are explanatory views showing a pressing state by the hydraulic cylinder. DESCRIPTION OF SYMBOLS 1 ... Pipe burying device, 2 ... Pit, 3 ... Base, 4 ... Drive part, 5 ... Casing, 6 ... Screw auger, 7 ... Tip conduit, 8 ... Blade, 9 ... Drilling head, 11 ... Motor, 12 ... Propulsion Cylinder, 13 ... Buried pipe, 14 ... Pipe pushing part, 16 ... Transmission part, 17 ...
Pressure receiving part, 20 ... Detector, 21 ... Detected surface, 22 ... Hydraulic cylinder, 23 ... Guide pin, 26 ... Expansion / contraction mechanism.

Claims (1)

[Scope of utility model registration request] 1. A rear end of an embedded pipe is brought into contact with a pipe pushing portion of a drive portion,
In the pipe burying device for fitting the rear end of the front conduit slidably in the axial direction to the tip of this buried pipe, and burying the buried pipe by pushing the buried pipe into the ground excavated by the front conduit, on the front conduit side, A detector for detecting the relative distance between the tip of the buried pipe and the leading conduit is provided, and an expansion / contraction mechanism is provided for adjusting the relative distance between the rear end of the buried pipe and the pipe pushing portion based on the detection signal of this detector. A buried pipe length correction device for a pipe burying device.