JPH054496B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for folding a cylindrical flexible membrane into a bellows shape while remaining cylindrical. The present invention relates to a method and an apparatus for folding a cylindrical membrane in a longitudinal direction into a bellows shape, which is suitable for covering the outer or inner periphery for the purpose of water-stopping.

[Conventional technology]

In recent years, when large-sized, large-diameter steel pipes, humid pipes, ceramic pipes, or plastic pipes are buried underground through culverts or open drains during water supply, sewage, and drainage construction,
A construction method has been developed in which the outer surface of the pipe is covered while being buried. These methods use cylindrical membranes with different diameters depending on the diameter of the pipe to be buried, and as the pipe is coated and exposed to harsh conditions due to being buried underground, it is difficult to withstand the harsh conditions. A membrane with the desired performance, i.e., a certain thickness and stiffness, is used. Further, it is difficult to maintain a cylindrical film used for a coating having a length of several tens of meters to several hundreds of meters and a considerable thickness in a cylindrical shape.

Therefore, the cylindrical membrane and its folding method must satisfy the following requirements. To make the volume of the cylindrical membrane storage tube or device as small as possible,
A cylindrical membrane is folded into a donut shape and can be easily drawn out from a storage tube when covering the tube.

(2) The diameter of the cylindrical membranes ranges from 200mmφ to large diameters of 10mφ, and the pipe line spans a wide range of 30 to 1000m, so it can be used for small quantities and a wide variety of products.

(3) When the cylindrical membrane is not simply folded, but is folded into a donut-shaped bellows shape, a means for removably fixing the position of the folds of the cylindrical membrane in a ring shape at right angles to the length direction. Retain its shape when folded.

Methods for folding a long cylindrical membrane into a bellows shape include a method in which ring-shaped rims are fixed to the cylindrical membrane at a constant pitch, as seen in wind pipes, and the membrane is manually folded into a bellows shape, and a method in which it is folded into a spiral shape. (Tokukai Akira
59-39241), method of folding into an octagon (Special Publication No. 1973)
-2429), and a method of folding a large amount with a constant stroke in the axial direction (Japanese Patent Publication No. 16926/1983).

[Problem that the invention seeks to solve]

However, at present, no practical method has been provided that can handle so-called bellows-like folding of a wide variety of products in small quantities, with various outer diameters ranging from small diameters to meters, and different folding shapes.

An object of the present invention is to provide a method and apparatus that can solve the above requirement (3) and also satisfy the above requirements (1) and (2) at the same time.

[Means for solving problems]

The present inventors have made extensive studies to achieve the above object, and have finally arrived at the present invention.

That is, the present invention includes a step of supplying a cylindrical flexible membrane in which continuously formed cylindrical flexible membranes are sequentially fed to a required length, and a step of supplying a cylindrical flexible membrane in the form of a truncated cone with a roller at a predetermined length of the sequentially supplied membrane. An auxiliary fixing plate with a roller equipped with a rectifying part is disposed inside, and a fixing jig is provided on the outer periphery of the membrane and is divided into one or more parts and is movable up and down and back and forth, and is detachable. The folding process involves holding the membrane at the position of the auxiliary fixing plate, moving it downward by a certain pitch, returning to the original position, and repeating the operation of holding the peak of the next pitch, and the divided fixing plate. While inserting one or more pushing plates provided between the jigs into the valleys of the folds during folding, press the folds downward when the fixing jig releases the membrane and rises again. , and a holding process, and these operations are repeated to fold into a bellows shape,
A method and an apparatus for folding a cylindrical flexible membrane into a bellows shape, which comprises a step of sequentially moving the hollow core tube downward in an elevator along the outer periphery once or every predetermined number of times. This is what we provide.

Specifically, a long cylindrical flexible membrane to be folded is fed out from one side and held in a cylindrical shape by a folding rectifier equipped with a disc, a truncated cone, and/or a cylindrical body that holds the membrane in a cylindrical shape. Then, the tip of the membrane is attached to a temporary end plate so that it can move in the direction of the central axis of the cylinder, and the cylindrical membrane is fixed using a fixing jig that is provided on the outer periphery of the membrane and is movable up and down and back and forth and can be detached. For each folding pitch, the crest of the fold is held and moved downward by a predetermined pitch to complete one pitch of folding. During this time, the method of folding the troughs to prevent the creases from becoming messy and the folded state becoming bulky, the pressing operation to prevent the folded folds from returning to their original shape due to the spring effect, and the method of folding the folds into a donut-shaped bellows shape. An elevator or screw shaft supporting the membrane is combined with a temporary end plate so that the membrane is successively lowered along the outer periphery of the hollow core tube. By repeating these operations, when the folding is completed, the temporary end plate is removed, and the end of the cylindrical membrane is reattached to the end plate of the folded hollow core tube, or the temporary end plate is fixed to the end plate.

In the present invention, the removable fixing jigs for the peaks of the folding folds include: (1) Bakyume (2) Bakyyume and chuck (3) Fixing auxiliary plate with or without notch and chuck (4) Membrane with auxiliary protrusions for fixation and chuck (5) A method such as a membrane provided with a strip-shaped magnetized material and a magnet can be used.

Among these, method (3) is particularly suitable, judging from the reliability of membrane retention and economical efficiency of equipment and other aspects.

In addition, as for the method of folding the troughs of the folding folds mentioned above, even without using a special jig, as the fixing jig is lowered, the film is folded in such a way that the folds of a certain pitch are directed toward the hollow core cylinder, but the folding wrinkles are not removed. In order to prevent the folded state from becoming messy and bulky, and to prevent the folded folds from returning to their original shape due to the spring effect, it is desirable to insert a pusher plate into the troughs of the folds and press them downward.

The material of the cylindrical flexible membrane used in the present invention is mainly selected from thermoplastic resin, taking into consideration flexibility, strength, thickness, etc., depending on the nature of the soil.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a cross section of a cylindrical flexible membrane 1 folded by the folding method of the present invention, which has a so-called bellows shape and can be easily folded by fixing one end and pulling the other end. It can be stretched and restored to a long cylindrical body.

FIGS. 2a and 2b are explanatory views showing the folding process according to the folding method of the present invention.

That is, the tip of a folding hollow core tube (cassette) 5 comprising a truncated conical rectifier 2 holding the membrane 1 in a cylindrical shape and a cylindrical body 4 with an auxiliary fixing plate 3 is fixed to a temporary end plate 6. The membrane 1 is set as shown in FIG. 2a. The original fabric obtained by folding the cylindrical membrane in half is pulled out through roll 7, and then passed through rolls 8 and 8'.
After that, it is placed over the folding cassette 5 from above, and the tip of the cylindrical membrane is fixed to the temporary end plate 6 with a fixing device such as a rivet.

Next, as shown in FIG. 2b, the cylindrical membrane is fixed by means of fixing jigs (chuck devices) 9a and 9a' that are movable up and down and back and forth through the fixing auxiliary plate 3 at a position of a certain pitch width p to be folded. It is held in a cylindrical shape.
The chuck devices 9a, 9a' move back in the radial direction while holding the membrane, and at this time, due to the slippage between the fixing auxiliary plate and the membrane material, only the membrane is separated from the auxiliary plate while being held in the chuck. Then, as the chuck continues to descend in the axial direction by a predetermined pitch, the membrane folds inward. At this time, the folding of the inside part becomes irregular, resulting in a messy folded finish. To prevent this, the membrane is regularly folded inward by the pushing plates 10a and 10a' as the membrane descends. Push it in. Therefore, Figure 3 a to d
As shown in the figure, the cylindrical shape is folded into a bellows shape. The chuck devices 9a, 9a' then release the membrane and rise again by the next pitch and repeat the operation. This folding operation is performed continuously, and the cylindrical membrane is folded one after another into a bellows shape as shown in FIG. 2b.

In this way, the pushing plates 10a and 10a' hold and fix the membrane while the membrane is being folded once, and prevent the folded membrane from floating upward due to the spring effect, and also prevent it from being newly folded in the next process. Retain the valley folds of the membrane.

The chuck device and the pushing plate are arranged on the outer periphery of the cylindrical membrane as shown in FIG. 4, and are each divided into one or two or more pieces, making it convenient for the chuck to move up and down and back and forth. The folding membrane whose tip is fixed to the temporary end plate 6 is lowered downward every time it is folded, and when the folding is completed, the temporary end plate 6 is removed and replaced with the end plate 12 of the folding cassette. During burial work, the membrane folded into a cassette is stored together with the cassette in a storage pipe connected to the rear of the shield machine.

As a specific example of the above-mentioned chuck device, there is a vertically moving cylinder 1 as shown in a partially enlarged view in FIG.
At the end of the chuck 7, there is a cylinder 18 for moving the chuck 9 back and forth, and a chuck cylinder 19 for opening and closing the chuck 9.A frame is attached to which the chuck 9 that actually grips the membrane is attached, and this is attached to the support 20. There is something.

Note that although the folding machine in the example is of a vertical type,
A similar effect can be achieved even in a horizontal type.

〔Effect of the invention〕

In the present invention, a folding cassette is used which is equipped with a chuck device that is movable up and down and back and forth and is detachable, a truncated conical rectifying section that can be replaced according to the diameter of the cylindrical membrane, a fixing auxiliary plate, and an end plate. As a result, cylindrical membranes of various diameters and lengths can be folded in a short time using the same device, which has a great effect on the industrial field that uses the tube coating method.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a folded cylindrical flexible membrane according to the present invention, Fig. 2 is an explanatory diagram illustrating the process of folding the cylindrical membrane according to the present invention, and Fig. 3 is a cylindrical membrane shaped like a bellows. FIG. 4 is an explanatory diagram illustrating the chuck and pushing plate device of the present invention, and FIG. 5 is an explanatory diagram illustrating the chuck device which can be moved up and down. 1... Cylindrical flexible membrane, 2... Rectifying section, 3... Fixing auxiliary plate, 4... Cylindrical body, 5... Hollow core tube (or folding cassette), 6... Temporary end plate,
7...Roll, 8...Nip roll, 9...Chuck, 10...Press plate, 11...Temporary end plate support, 12...End plate, 13...Screw shaft, 14...Fixing base, 15... ... Stage or second floor, 16 ... Foundation, 17 ... Vertical movement cylinder, 18 ... Back and forth movement cylinder, 19 ...
...Cylinder for chuck, 20...Support.

Claims (1)

[Claims] 1. A step of supplying a cylindrical flexible membrane in which a continuously molded cylindrical flexible membrane is sequentially fed out to a required length, and a conical roller equipped An auxiliary fixing plate with a roller equipped with a table-shaped flow straightening section is placed inside, and a fixing plate that is divided into one or two or more pieces and is movable up and down and back and forth, and is detachable, is provided on the outer periphery of the membrane. The folding process involves holding the membrane at the position of the auxiliary fixing plate with a jig, moving it downward by a certain pitch, returning to the original position, and repeating the operation of holding the peak of the next pitch. While inserting one or more pushing plates provided between the fixing jigs into the troughs of the folds during folding, push the folds downward as the fixing jigs release the membrane and rise again. A pushing process of pressing and holding the hollow core cylinder, and a downward feeding process of repeatedly folding these operations into a bellows shape and sequentially moving the hollow core tube downward along the outer periphery of the hollow core cylinder by an elevator once or every predetermined number of times. A method for folding a cylindrical flexible membrane into a bellows-like shape. 2. A cylindrical flexible membrane supply means for sequentially supplying and transporting continuously molded cylindrical flexible membranes by a feed roller, and a truncated conical rectifier with rollers inside the supplied cylindrical flexible membrane. A fixing auxiliary plate with a roller is provided, and the membrane is fixed at the position of the fixing auxiliary plate from the outside using a fixing jig that is divided into one or two or more pieces and is movable up and down and back and forth and is detachable. A folding means for holding and moving a predetermined length downward, and one or more pushing plates provided between the divided fixing jig are inserted into the troughs of the folds being folded. A means for pressing and holding the folds downward when the jig releases the membrane and ascends again, and a means for moving downwards in an elevator along the outer periphery of the hollow core tube each time the jig is folded into a bellows shape once or a predetermined number of times. 1. A bellows-like folding device for a cylindrical flexible membrane, comprising a downward feeding means for folding a cylindrical flexible membrane.