JPH03285137A - Method for investigating behavior of expansion flexible pipe joint - Google Patents

Abstract

PURPOSE:To simply perform rational and accurate investigation and measurement for a considerably long period of time in low cost by connect a joint part body, pipe bodies to be connected and a measuring box by a plurality of the wires provided in protective pipes in a freely slidable manner. CONSTITUTION:When pipes 10, 10 to be connected are connected by an expansion flexible joint 1, connection seats 2, 2 are fixed to the pipes 10 to be connected before and behind the joint 1. A plurality of the wires 3, 3, 3 inserted through protective pipes 4 in a freely slidable manner are prepared to be drawn out of the protective pipes 4 on one end sides thereof and the protective pipes 4 are fixed to the connection seats 2 and the joint 1 is linearly connected in parallel to the pipe axis by the metal fittings 9 provided to the leading ends of the wires 3. The other ends of the wires 3 extend into a measuring box 5 from the protective pipes 4 fixed to the side wall of the box 5 to be connected to the markers 7 of an indication means and the wires 3 are always linearly kept by providing elastic materials 8 between the markers 7 and the other side wall under tension. By this method, the displacement quantity due to the expansion, contraction and flexion between the joint and the pipes 10 to be connected is detected as the slide quantities of the wires at every angular interval.

Description

[Detailed Description of the Invention] ``Object of the Invention'' The present invention relates to a method for investigating the behavior of an expandable flexible pipe joint, which allows for relatively low-cost and precise measurement of the expandable and flexible behavior of pipe joints in underground pipes. The aim is to provide a method to obtain exploration results and prevent accidents involving membrane pipes and other accidents.

(Industrial application field) Behavior exploration technology for expandable flexible pipe joints.

(Prior art) A joint is an essential part in forming a pipe,
Various proposals have been made in the past regarding mechanisms for expanding and contracting the pipes connected at this joint.

By the way, when such a flexible expansion joint is used, it is important to monitor the behavior of the joint in order to avoid damage or other abnormalities to the joint or connected pipe, and conventional methods have not been used for this purpose. The proposed method is to probe electrically.

That is, the expansion/contraction bending behavior at the joint is converted into an electrical signal, and the electrical signal is used for detection.

(Problem to be Solved by the Invention) In the conventional devices as described above, in order to obtain the amount of change as a change in an electrical signal, electronic equipment or components that operate with various subtle changes are required in terms of equipment. This has the disadvantage of inevitably increasing costs. Moreover, such electrical methods lack accuracy, and the measurement results do not properly display the actual expansion/contraction flexibility situation, so even if a dangerous situation is detected, there is almost no problem, or there is no problem. Even if the exploration results are of a level that should not be considered a problem, they are still in a dangerous state, and even if detection equipment is installed, there is a high possibility that a serious accident will occur. This also applies when using ultrasonic waves, electromagnetic waves, or other techniques.

Furthermore, in systems that employ electrical methods such as those described above over a long period of time, there is a high possibility that disturbances such as groundwater or rainwater will intervene, and failures may occur in the minute mechanisms that detect changes in electrical signals as described above. Problems remain in terms of detection accuracy, etc. Particularly in those installed underground or underwater, the structure of the electric circuit is likely to be damaged by external forces such as ground movement and waves.

"Structure of the Invention" (Means for Solving the Problems) The present invention was developed after consideration to solve the problems in the conventional products as described above, and is as follows.

A joint seat is fixed to the pipe body to be connected in the expandable flexible pipe joint, and a plurality of wires, which are slidably housed in the protective tube, are arranged around the circumference of the pipe body to be connected, and each wire is connected to the pipe body from the joint seat. One end of each wire was pulled out and connected to the circumferential side of the joint body in a straight line at angular intervals, and the other end of each of the wires was pulled out from the fixed part of the measurement box and installed in the measurement box. Exploring the behavior of a telescopic flexible pipe joint characterized in that it is connected in a straight line to each indicating means, and the respective indicating means indicates or records the amount of displacement over time between the coupling pressure and the joint body. Method.

(Function) A joint seat is fixed to the pipe to be connected in the expandable flexible pipe joint, and a plurality of wires slidably housed in the protection tube are disposed around the pipe to be connected, and the joint is fixed to the pipe to be connected. By pulling out one end of each wire from the seat and connecting it to the circumferential side of the joint body in a straight line at angular intervals, the amount of displacement due to expansion and contraction between the joint body and the connected pipe body can be reduced. The sliding amount of the wire is detected at each angular interval.

The other end of each wire inside the protection tube arranged as described above is pulled out from the fixed part of the measurement box and connected in the same straight line to each indication means provided on the measurement box, thereby giving each indication. By displacing the means, it is possible to indicate or record the amount of displacement over time between the joint seat and the joint body.

The wire is protected by a protective tube and is continuous as a wire, does not require soldering or other connections, and has sufficient mechanical strength to ensure long-term durability. Its performance will not deteriorate due to flooding or other factors.

(Example) To explain the specific embodiment of the present invention shown in the attached drawings, as shown in FIGS. The connected pipe 1 is connected before and after the flexible joint 10.
0.10, and a plurality of non-stretchable wires 3 are slidably inserted into the protective tube 4 as shown in FIG. 3, and these wires 3. 3. One end of the pipe 1 is disposed in the circumferential direction of the joint 1 and the connected pipe 10 as shown in FIG. 1.2. That is, one end of each wire 3 is pulled out from the protective tube 4, the protective tube 4 is fixed to the joint seat 2 as shown in FIG. Connect as parallel straight lines.

The other end of each wire 3 as described above is guided to a structure 6 or a measurement box 5 installed on the ground, as shown in FIG.
The tube end of the protection tube 4 is fixed to the side wall of the measurement box 5, and the wire 3 is extended into the measurement box 5 and connected to an indicating (or recording) means such as a marker 7 as shown in FIG. An elastic member 8 such as a coil spring is stretched between the measurement box 7 and the other side to maintain the extending wire in a straight line at all times.

In addition, as shown in Fig. 7.8, the device according to the present invention is installed underground with guide sleeves II provided at both ends of the joint 1 as described above, and a guide pipe 12 is connected to these sleeves 11 for measurement. Each wire 3 (
It is preferable to ensure that the operation of the protective tube (with protection tube) is not obstructed by external dirt, etc. A vinyl sheet or the like is placed between the sleeve 11 and the pipe to be connected 10 to prevent dirt from entering inside, and the guide sleeve 11 is provided with Sun Tzu 21 and 21 to prevent the joint from entering. It is preferable to make it move in conjunction with the body 1. Furthermore, the measurement box 5 is provided with a scale plate 15 as shown in FIGS. 9 and 10, and by setting the indicating means 7 such as the marker described above to match the reference point of the scale plate 15, the amount of displacement can be determined. The scale 15a
It may be made so that it can be immediately obtained. Furthermore, regarding the equipment of the wire 3 as described above, when the indicating means 7 such as a marker is connected to the elastic material 8 with the measuring box 5 as described above and stretched, the length of the wire is determined to be a certain reference position. 3
At the other end of the wire 3, as shown in FIG. 3
The nut 14. is inserted through the threaded pipework 3 and screwed onto the threaded pipework 3.
A washer 16 is appropriately interposed between 14 and the wire 3 is tightened on both sides of the joint seat 2 to fix the protective tube 4 and the spiral tube 13.
A connecting fitting 9 is attached to the connecting fitting 9, and the connecting fitting 9 is connected to the joint 1 as shown in FIG. 12 or 13.

That is, in any case, by performing the above-mentioned exploration, the amount of displacement due to ground movement etc. between the pipe to be connected and the joint can be determined by the indicating means 7 such as a marker, such as the scale plate 15 of the measuring box 5, at the joint part. It is clear that each part can be accurately instructed and recorded, and even under conditions where the wire 3 and the protection tube 4 are appropriately bent, the amount of displacement can be effectively transmitted to the indicating means 7 by the wire 3. Ru. Therefore, when setting it up, it is only necessary to connect it using the wire 3 and the protective tube 4, and there is no need to consider electrical connections, leakage, etc., and the mechanical strength is sufficient, so it can be used for a considerable period of time. It is possible to appropriately carry out continuous management across the range.

"Effects of the Invention" According to the present invention as explained above, the expansion and contraction flexibility behavior of joints, etc. in underground pipes can be controlled relatively simply and at low cost, and moreover, rationally and accurately over a considerable period of time. It is something that can be explored and measured, and by making such measurements, it is possible to detect and avoid damage and other accidents in underground pipes, etc. as mentioned above, so it is highly effective industrially. It is an invention.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and FIG. 1 is an explanatory side view showing the external appearance of an example of an apparatus implementing the method of the present invention, FIG. 2 is an end view thereof, and FIG. The figure is a perspective view of the wire and protection tube, FIG. 4 is a partial side view of one end of the wire connected to the joint, and FIG.
The figure is a cross-sectional explanatory diagram of the measurement box arrangement according to the present invention for underground pipes, Figure 6 is an explanatory diagram of the connection state of the measurement box at the other end of the wire, and Figure 7 is a mechanism for implementing the method of the present invention. FIG. 8 is a cross-sectional view taken in the direction perpendicular to the tube axis, FIG. 9 is a partially cut-away plan view of one example of the measuring box, and FIG. 10 is a longitudinal cross-sectional view thereof. , FIG. 11 is a side view showing a specific configuration of the wire on the joint body connection side, and FIGS. 12 and 13 are partial sectional views showing the state of connection to the joint body. However, in these drawings, 1 is a joint, 2 is a joint seat,
3 is a wire, 4 is a protection tube, 5 is a measurement box, 6 is a structure, 7
1 is a marker, 8 is an elastic material, 9 is a connecting fitting, 10 is a pipe to be connected, 11 is a guide sleeve, 12 is a guide vibe, 1
3 is a spiral tube, 14 is a NAND, ] 5 is a scale plate, and 15a indicates the scale. 1st Enjoint 1st Enjun Hayabusa? Joint Zaken ■ Hayabusa ■ Engraving of the drawings Figure 42 Figure 13 Special Annotation Agency Commissioner Ueshibori Higashidono 1゜Display of incident 2nd year +! ftf Application No. & Ta 0.36 No. 2 ゜ Mulberry P Su Ne 4 + Ie Yawou Hanari Beak M te Rona “Modou wa Tobuhou Mi 3゜ Person making amendment Relationship with the case Applicant name (name) 8 Mizutsu ° Iftrick Stock Company Ne L 4 ° Agent

Claims (1)

[Claims] A joint seat is fixed to the pipe body to be connected in the expandable flexible pipe joint, and a plurality of wires, which are slidably housed in the protective tube, are arranged around the circumference of the pipe body to be connected, and each wire is connected to the pipe body from the joint seat. One end of each wire was pulled out and connected to the circumferential side of the joint body in a straight line at angular intervals, and the other end of each of the wires was pulled out from the fixed part of the measurement box and installed in the measurement box. Exploration of the behavior of a telescopic flexible pipe joint characterized in that it is connected in a straight line to each indicating means, and the respective indicating means indicates or records the amount of displacement over time between the coupling seat and the joint body. Method.