JPH0447044A - Lining work control device for laid pipe - Google Patents

Abstract

PURPOSE:To surely enlarge a spiral pipe in diameter by interposing a wire between the side peripheral sections of mutually adjacent band shaped bodies, forming a spiral pipe by a pipe manufacturing means mutually meshing the side peripheral sections, and thereby enlarging the spiral pipe while the spiral pipe is inserted into an existing pipe. CONSTITUTION:The side peripheral section of mutually adjacent band shaped bodies 10 are mutually meshed, and a wire 30 is continuously locked in order that the meshed portion is increased in frictional resistance, so that a spiral pipe is thereby formed. The spiral pipe 10a is inserted into an existing pipe 81 in order so as to be advanced, the tip end of the spiral pipe 10a is thereby fixed onto the existing pipe 81 thereafter. In the second place, propulsion force is imparted to the band shaped body 10 forming the spiral pipe 10a, so that the wire 30 is thereby separated at a specified speed from the spiral pipe 10b. Following which, the spiral pipe 10a is enlarged in diameter while the spiral pipe 10a is being rotated with the side peripheral sections of the respective band shaped bodies 10 slidably moved out of the section from which the wire 30 is separated. By this constitution, the deteriorated existing pipe 81 can thereby be recycled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a lining method for lining the inside of an old existing pipe for recycling the pipe.

[Conventional technology]

For example, metal pipes and humid pipes used as buried pipes for water and sewerage systems become obsolete after long-term use, and there is a risk of water leakage due to cracking or corrosion. One method is to insert a synthetic resin pipe into the existing pipe and line it.

One of the methods is to insert a spiral tube manufactured by winding a synthetic resin band in a spiral shape into an existing tube and install it inside the existing tube, as disclosed in, for example, Japanese Patent Application Laid-open No. 61-48690. There is. The details will be referred to the above cited document, and the outline of the construction method will be briefly explained. That is, as shown in a schematic diagram of an example of the apparatus in FIG. This pipe making machine 20 is sequentially supplied with synthetic resin strips 10 whose side edges can engage with each other, and the pipe making machine 20 The helical tube 10a is sequentially formed and manufactured by winding the strips 10 in a spiral shape and engaging the side edges of the adjacent strips 10 with each other. The manufactured spiral tube 10a is sequentially led out from the tube making machine 20 while rotating. The spiral pipe 10a led out from the pipe making machine 20 is directly inserted into the existing pipe 81 and is propelled while rotating within the existing pipe 81. When the spiral pipe 10a is inserted over almost the entire area of the existing pipe 81, a backfilling material such as cement mortar is filled between the spiral pipe 10a and the existing pipe 81, and the spiral pipe 10a is inserted into the existing pipe 8.
Fixed within 1. Thereby, the existing pipe 81 is lined with this spiral pipe 10a.

The material of the strip 10 formed in the spiral tube 10a is as follows:
Flexible synthetic resins such as polyvinyl chloride, polyethylene, and polypropylene are used. This strip-shaped body 10 usually has a convex line continuous in the longitudinal direction on one side edge, and a concave line that can be engaged with the convex line on the other side edge in the longitudinal direction. are arranged continuously. When the strip 10 is wound spirally, the grooves are fitted into the protrusions on the side edges of the adjacent strips 10, forming a spiral tube 10a. ing.

[Invention or problem to be solved]

However, with the above lining method,
The spiral tube 10a inserted into the existing pipe 81 is propelled through the existing pipe 81 while rotating, so the spiral tube 10a having an outer diameter slightly smaller than the inner diameter of the existing pipe 81 is
When inserted into the interior, almost the entire outer peripheral surface of the spiral tube 10a comes into contact with the inner peripheral surface of the existing tube 81, and a large resistance is applied to the spiral tube 10a. Pipe making machine 2 that manufactures the spiral pipe 10a
0, the strips 10 are sequentially supplied to the pipe making machine 20.
Since the helical tube 10a produced in the pipe manufacturing machine 20 is sequentially led out from the pipe making machine 20, when resistance is applied to the produced helical tube 10a, the helical tube 10a is not propelled through the existing pipe 81.
By sequentially sending out the strip 10 as a spiral tube 10a by the pipe making machine 20, a propulsive force is applied to the strip 10 in the spiral tube 10a, and the mutually fitted protrusions and grooves slide out, forming a spiral. The diameter of the tube 10a becomes larger. In this way, as the diameter of the spiral pipe 10a increases, the contact resistance between the spiral pipe 10a and the existing pipe 81 increases,
The spiral pipe 10a cannot be propelled inside the existing pipe.

Therefore, in the conventional lining method, the inner diameter of the spiral pipe 10a is made sufficiently smaller than the inner diameter of the existing pipe 81 in order to prevent almost the entire outer peripheral surface of the spiral pipe 10a from coming into contact with the inner peripheral surface of the existing pipe 81. This is done by propelling it into the existing pipe 81.

Therefore, in the existing pipe 81 lined by the conventional lining method, the part through which the fluid flows (the cross section of the #swirling pipe 10a) is significantly smaller than the original fluid passing part (the cross section of the existing pipe 81). The fluid flow rate after lining is significantly lower than the fluid flow rate before lining.

Furthermore, if the difference in the inner diameter between the existing pipe 81 and the spiral pipe 10a becomes large, the spiral pipe 10a may tilt relative to the existing pipe 81. The spiral tube 10a must be fixed to the existing tube 81 by filling it with material. If the difference in the inner diameter between the existing pipe 81 and the spiral pipe 10a becomes large, a large amount of backfilling material is required, which poses a problem in that the backfilling operation requires a lot of effort and also impairs economic efficiency.

In order to solve such problems, the inventors, who are the same as those of the present application, have developed a method for winding the strip 10 around the spiral tube 10a, as shown in FIG. , developed an improved means for increasing the resistance between the side edges of each of the engaged strips 10 by locking the strip-shaped wire 30 between the engaged side edges of the strips 10, and developed a special improvement means. The application has already been filed in Japanese Patent No. 1-219519. By manufacturing the helical tube 10a using the pipe making machine 20 in this way, the helical tube 10a
Since the wire 30 increases the winding resistance between the side edges of the strip 10 constituting the tube, it is possible to manufacture a small-diameter helical tube 10a. Then, after inserting such a small-diameter spiral tube 10a into the existing pipe 81, the belt-like body 10 is supplied as in the case of manufacturing the spiral tube 10a, and the belt-like body 10 constituting the spiral tube is propelled. While applying force, the detachment tool 40
Accordingly, when the strip wire 3o is separated from between the side edges of the strip 1o, the side edges of each strip 1o sequentially slide from the part where the wire 3o was detached, and the helical tube 10a becomes The diameter is expanded while rotating. Then, the diameter of the spiral tube 10b is expanded.
is almost in contact with the inner peripheral surface of the existing pipe 81.

In this way, the spiral pipe 10a inserted through the existing pipe 81
If the diameter of the helical pipe 10b is gradually expanded, the spiral pipe 10b will come into contact with the entire inner circumferential surface of the existing pipe.

The purpose of the cited previously applied invention is, as mentioned above, to
Existing pipe 8 that can line the inner peripheral surface of the existing pipe with approximately the same diameter as
In addition, when inserting the spiral pipe 10a into the existing pipe 81, the spiral pipe 10a is
The object of the present invention is to provide a lining construction method for an existing pipe 81 that allows the spiral pipe 10a to be easily advanced into the existing pipe 81 without fear of expanding the diameter of the spiral pipe 10a. Also, furthermore,
Spiral tube 10 inserted into existing tube 81 with a relatively small diameter
It is an object of the present invention to provide a lining construction method for an existing pipe 81, which can reliably expand the diameter of the pipe 81 over its entirety to a state where it contacts the inner circumferential surface of the existing pipe 81.

For this reason, the method of lining the existing pipe 81 of the previously applied invention involves the steps of spirally winding the strips 10 whose side edges can engage with each other, and the winding of the strips 10 that are adjacent to each other. a step of manufacturing a helical tube 10a by engaging the side edges of the parts 10 with each other and continuously locking the wire rod 30 in the engaged part in order to increase the FJ friction resistance of the engaged part; , a step of sequentially inserting the manufactured spiral tubes 10a into the existing tube 81 and fixing the tip of the inserted spiral tube 10a into the existing tube 81 by pushing the inserted spiral tube 10a into the existing tube 81; With the tip of this helical tube 10a fixed to the existing tube 81, while applying a propulsive force to the band-like body 10 constituting this helical tube 10a, the above-mentioned The wire rod 30 is connected to the spiral tube 10
b and expanding the diameter of the spiral tube 10a by sliding the mutually engaged side edges of the strip 10 from the portion of the spiral tube 10a from which the strip 10 has been detached. The purpose is to achieve the above objective by including the following.

Here, an object of the present invention is to provide a control means for effectively implementing the above-mentioned construction method of the previously applied invention.

[Failure to solve the problem]

For this reason, in the present invention, a spiral tube formed by a tube manufacturing means that interposes a wire between the side edges of adjacent strips and engages the side edges is inserted into an existing tube and is propelled. A lining method for existing pipes in which lining is carried out by enlarging the diameter of pipes includes a hydraulic unit for generating hydraulic power for the pipe manufacturing means, a voltage-controlled proportional control valve provided in the hydraulic circuit, and the intermediate pipe. A wire winding means driven by a hydraulic motor for winding the loaded wire, a winding speed detecting means for this winding means, and a wire winding speed command value and a current value obtained by the speed detecting means. a motor drive control means for controlling a drive command value sent to the drive motor of the wire rod winding means based on the speed;
A hydraulic pressure detection means for detecting a hydraulic pressure value in an initial process of expanding the diameter of the spiral tube with the tip of the spiral tube fixed to the existing tube is provided in the hydraulic unit, and this initial hydraulic pressure change data is collected. Hydraulic pressure calculation processing means for calculating oil pressure change data by averaging at regular time intervals, and oil pressure change width detection for detecting the oil pressure change width based on the oil pressure change data obtained by the oil pressure calculation processing means. a hydraulic control upper limit value correcting means for setting the upper limit value of the hydraulic pressure control during the diameter expansion process to be higher than the oil pressure change range; The above object is achieved by configuring the winding speed correcting means for correcting the command value sent to the control means.

[Effect]

The above-mentioned lining construction method control device solves the problems that occur in the conventional construction method example, and prevents the diameter of the spiral pipe that is propelled inside the existing pipe from expanding, allowing smooth insertion without the need to reduce the diameter significantly. Furthermore, the diameter of the pipe can be reliably expanded and brought into contact with the inner surface of the existing pipe.

〔Example〕

An embodiment of the control device according to the present invention will be described below based on the example of the device shown in FIG. 5.

FIG. 2 is an overall explanatory diagram of the control device of the present invention and each actuator, and FIG. 1 is a control block diagram thereof.

(Structure) In FIG. 2, 60 is the lining construction method control device for the existing pipe 81 of this embodiment, 20 is the pipe making machine including the oil pressure sensor 20a, etc., and the oil pressure switch 23. which generates power by the motor 22. It is driven by a hydraulic unit 61 that includes a proportional control valve and the like.

Said strip 10 with a reblock profile from a pipe making machine 20
In Fig. 5, the propulsive force applied to the winding force applied to the winding force and the winding speed v2 by the strip wire rod 30 @ winding device 50 having winding speed detection means are expressed as v2== ・v1-d, and the length of the conical part is constant. In order to synchronize the pipe making machine 20, the output signal of the oil pressure sensor 20a attached to the pipe making machine 20 is used.

Here, (1) is the feed rate of the strip 10, and D and d are the diameters of the spiral tubes 10a and 10b, respectively.

(Operation) This control operation will be explained below based on the operation sequence flowcharts of FIGS. 1.2 and 3 according to the division into the pipe manufacturing process and the diameter expanding process. FIG. 4 is an example of a characteristic diagram showing the oil pressure value P in each process.

Further, in FIG. 1, 70 is an analog/digital converter for the output oil pressure value P of the oil pressure sensor 20a, and 71 is a CP
U, 72 is change data Pj+ of diameter expansion initial average oil pressure value P
, Pjz , -= averaging processing circuit 73 calculates the initial maximum/minimum average oil pressure of each diameter expansion PJ waaw / PJ
ml. The change width (P jr−−−P J−+
n) calculation circuit, 74 is a diameter expansion control oil pressure upper limit value PJu setting circuit, 75 is a timer-based time T1 setting means, 76
Reference numeral 77 represents a time T2 setting means for the timer, 78 represents a correction command circuit, and 79 represents the same signal.

In FIG. 3, first, in the pipe making process, in step S1, a command is given to start up the pipe making machine 20, and the hydraulic unit 61 is driven. Next, in step S2, the opening degree of the proportional valve in the hydraulic unit 61 is adjusted by voltage output, and a propulsive force is applied to the band-shaped body 10. When the pipe manufacturing is completed, a stop switch (not shown) is used to command the end of the pipe production in step S3.

Next, in step S4, the tip of the spiral tube 10a is fixed to the inner wall of the existing tube 81. After that, the process moves to the diameter expansion step, and in step S5, a command is given to start the diameter expansion.

After starting the diameter expansion, a put time (for example, about 3 seconds or less) is provided so as not to be affected by the disturbance in the hydraulic pressure at the start of the diameter expansion (see Fig. 4), and in step S6, the winding speed of the strip wire 30 is set to ■2.
is commanded, the diameter expansion initial oil pressure P take is input in step s8, and thereafter, changing oil pressure value data is sampled at fixed time intervals (for example, about 0.5 seconds), and in step s9, for example, 1. Diameter expansion initial average oil pressure change take Pj+, Pj2 every 5 seconds. ..., etc. That is, diameter expansion start in step S5 → dead time 0 to 3
After seconds → PJ + calculation after 3 to 4.5 seconds → Pj after 4.5 to 6 seconds
2 calculations...and so on.

Next, Pj+, Pj2 . -・-・maximum value Pj□tto and minimum value Pj+-in in step S1
In step S11, the change width (P Jmax P Jmin), which is the difference between the two, is calculated, and in step S12, it is changed to a predetermined value (for example, about 5 to 6 g/
crn"). Continue monitoring to see if it is within the range (step S13).
Input the current oil pressure value P, monitor whether it is higher than Pj□8 in step S14, and when it becomes higher (YE
In step S15, the above-mentioned timer is activated. At this time, after a predetermined time (for example, about 4.5 seconds) has elapsed in step S16, the current oil pressure value data is input in step S17, and the diameter expansion control upper limit value Pju is set in step S18. It is determined in step s2o whether it is higher than the value P, and the current oil pressure value PJu after 11 hours becomes the upper limit value for diameter expansion control.

Then, in step S19, the current oil pressure value Ptake is input, and it is determined whether this value is higher than the PJu value. If it exceeds this value (YES), the winding speed V2 is changed in step S21.
In step S22.523, the timer outputs "high" for a certain period of time T2 and returns to "low" again.

Then, when the oil pressure value P becomes high again, the same control is repeated, and when the above conditions are met, the winding speed v2 is reached in step S24.
A correction end command is issued, and the diameter expansion step is ended after the end command is issued in step S25. During this time, from step S5 onwards,
In step S7, proportional valve opening control is continued.

By the above control device operation, the diameter of the helical tube 10b can be stably expanded and it can be brought into reliable contact with the inner diameter of the existing tube 81.

〔Effect of the invention〕

As explained above, according to the device of the present invention, the fifth
As shown in the figure, the improved existing pipe lining method has been controlled to ensure reliable nailing, making it possible to effectively realize the advantages of this method.

[Brief explanation of drawings]

Fig. 1 is a control block diagram of one embodiment of the control device of the present invention, Fig. 2 is an overall explanatory diagram of the control device and each actuator, Fig. 3 is a control operation sequence flowchart thereof, and Fig. 4 is a control block diagram of an embodiment of the control device of the present invention. , An example of the hydraulic pressure value characteristic curve in each process,
FIG. 5 is an explanatory diagram of an improved lining construction method to which the present invention is applied, and FIG. 6 is an explanatory diagram of an example of a conventional lining construction method. 10... Band-shaped body 10 a, f Ob---= Spiral tube 20...
... Pipe making machine 20a ... Pressure sensor 22. 53 shafts ... Motor 30 ... Band wire 50 ... Band wire winding machine 52 ... - Winding speed detector 61...- Pressure crab unit 71...- CPU 72... Averaging processing circuit 73... Hydraulic pressure change width calculation circuit 74...・・・Diameter expansion control oil pressure setting circuit 75.77-・
...Timer setting means Pj --- Oil pressure value ■2 --- Winding speed

Claims (1)

[Claims] Lining is carried out by inserting a wire rod between the side edges of adjacent strips and engaging the side edges of a spiral tube formed by a tube manufacturing method, which is inserted into the existing tube and expanded in diameter. The existing pipe lining construction method includes a hydraulic unit for generating hydraulic power for the pipe manufacturing means, a proportional control valve installed in the hydraulic circuit, and a motor drive for winding the interposed wire rod. A wire rod winding means, a winding speed detection means of the wire rod winding means, and a winding speed detection means of the wire rod winding means based on a given wire rod winding speed command value and the current speed obtained by the speed detection means. and a motor drive control means for controlling a drive command value sent to the motor, and with the tip of the spiral pipe fixed to the existing pipe,
A hydraulic pressure detection means for detecting the hydraulic pressure value in the initial step of expanding the diameter of the spiral pipe is provided in the hydraulic unit, and this initial hydraulic pressure change data is averaged at regular intervals to calculate the hydraulic pressure change data. a hydraulic pressure calculation processing means for detecting the hydraulic pressure change range based on the hydraulic pressure change data obtained by the hydraulic pressure calculation processing means;
Hydraulic control upper limit value correction means for setting a hydraulic pressure control upper limit value during a subsequent diameter expansion process to be higher than the oil pressure change width, and sending data to the motor drive control means based on the oil pressure change data during this diameter expansion process. 1. A control device for a lining method for existing pipes, comprising a winding speed correction means for correcting a command value.