JP2002139178A - Large pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rise of cost, perform pipe connection work easily and speedily, and cut off water securely. SOLUTION: A large pipe 2 which has an inside diameter of 1000 mm or more, is made of synthetic resin, has a spiral or annular shape in which projecting parts 2A and recessed parts 2B are alternately positioned in the direction of pipe shaft axis, and is formed into a wave shape is provided with a flange 1 for connecting pipes at at least one end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized synthetic resin pipe having an inner diameter of 1000 mm or more used for forming a large-sized pipe such as a drainage pipe below a road or a drainage pipe for sewerage. The present invention relates to a large pipe capable of easily and quickly connecting a plurality of the large pipes.

[0002]

2. Description of the Related Art A concrete fume pipe is generally used as the above-mentioned large pipe. However, in recent years, the fume pipe has strength equal to or higher than that of a fume pipe, and has a durable surface, light weight, and labor saving during construction. In many cases, large-sized pipes made of synthetic resin, which are advantageous in, are used. And such a large pipe is not only a large pipe having an inner diameter of 1000 mm or more, but is almost always set to a long dimension with a length of about 5 m in consideration of a transport surface and a construction surface. When connecting a plurality of such large and long large pipes, first, as shown in FIG. FIG. 7 (b) after arranging one half-split joint 22 made of a steel sheet with the packing sheet 23 set on the inner surface side (upper side) thereof.
As shown in (2), the two large tubes 24, 24 are arranged such that their ends are located substantially at the center of the packing sheet 23 in the tube axis direction. At this time, the large pipes 24 are arranged so that a large gap does not occur between the ends of the large pipes 24. Next, FIG.
As shown in (c), a part of the concave part (valley part) on the upper surface of the end of each of the two large pipes 24, 24 is used for stopping water so as to slightly rise from the upper end of the convex part (peak part). Caulks 25, 25 for filling gaps formed between the blocks (not shown) and the water blocking blocks and the recesses.
Then, the packing sheet 23 is wrapped around the large tubes 24, 24 while being sufficiently pulled, and fixed with a vinyl tape (not shown) or the like. Subsequently, after covering the other half joint 26 from above, the nuts 29 are screwed into the flanges 21 and 21 of the two half joints 22 and 26 and the nuts 29 are screwed into the flanges 21 and 21 so that the upper and lower flanges 21 and 21 are approached. Then, the connection is completed.

[0003]

According to the above connection method, a pair of upper and lower half joints 26, 22, a packing sheet 23, and a caulking material 25 are required separately, and a total cost including material costs and transportation costs is required. Not only is the cost high, but performing these numerous materials along the connection procedure is time consuming and laborious. In particular, in order to fill a large recess, a water blocking block (not shown) is pressed against the caulking material 25 as described above, and the water blocking block is wrapped around the caulking material 25 to fill the recess. Processing has to be performed, and the filling work is troublesome and troublesome, and there is a time loss that the connection work cannot be performed efficiently, which further causes a long time for the connection work. In addition, the operation of disposing the packing sheet 23 on the inner surface side of the half joint 22 and then moving the two large heavy pipes 24, 24 to a specific position above the packing sheet 23 imposes a heavy burden on the operator. Had become. In addition, since the method of filling the caulking material 25 and the way of putting the packing sheet 23 vary depending on individuals and the condition of the day, there may be cases where it is impossible to completely stop the water. In some cases, connection points that were not required occurred. In addition, since the caulking material 25 is a clay-like material having a constant viscosity that does not cure, for example, the drainage in the pipe becomes full,
The caulking material 25 immediately moves just by receiving a part of the pressure of the drainage (small pressure), and the water cannot be stopped. Therefore, the reliability is low, and early improvement is demanded.

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is intended to solve the problem of suppressing an increase in cost, and furthermore, it is possible to perform connection work easily and quickly, and to reliably perform water stoppage. The point is to make it possible.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a helical coil made of a synthetic resin having an inner diameter of 1000 mm or more and having convex portions and concave portions alternately arranged in the tube axis direction. At least one end of the pipe main body formed in a shape or an annular shape was provided with a pipe connection flange to constitute a large pipe.
In a large pipe made of a synthetic resin having an inner diameter of 1000 mm or more as described above, a member that can be connected to the large pipe itself instead of using another member such as a half joint as in the related art. The inventor of the present application came up with the idea of providing a flange having a simple structure and capable of suppressing an increase in weight. By providing such a flange, it is possible to dramatically increase the strength at a connection portion where the flanges are connected together. Then, after arranging a plurality of large pipes configured as described above in the axial direction of the pipe along the arrangement path, the flanges are brought into contact with each other and tightened and fixed with tightening tools such as bolts and nuts. Connection can be completed. It is not necessary to move a heavy large tube to a predetermined position as in the related art. In addition, transportation to the construction site requires only large pipes and fasteners. In addition, instead of using a clay-like caulking material as in the past, by utilizing the pressing force between flanges,
Even if water pressure is applied to the connection, there is no possibility that water cannot be stopped.

[0006] By providing positioning marks on the flange, the large pipes are arranged while aligning the marks, so that the heavy heavy pipes are rotated one by one in order to align the bolt holes of the flanges at the time of connection. There is no need to perform the connection, and the connection operation can be performed more quickly.

[0007] A large pipe can be obtained by forming the flange separately from the pipe main body with a synthetic resin, and welding the separately formed flange to the outer surface of the pipe main body. In particular, as the pipe body becomes larger, it is not only difficult to integrally form the flange and the pipe body, but also the size of the manufacturing apparatus is increased, so the separately formed flange is attached to the pipe body as described above. It is. By welding the flange to the pipe body so that the connection side end face of the flange is located slightly closer to the connection side than the end face of the pipe body, even if the end face of the pipe body has some irregularities, it is surely connected by the flange. be able to.

[0008] A large pipe can be obtained by forming the flange separately from the pipe main body with a synthetic resin and welding the separately formed flange to the end face of the pipe main body. In particular, as the pipe body becomes larger, it is not only difficult to integrally form the flange and the pipe body, but also the size of the manufacturing apparatus is increased, so the separately formed flange is attached to the pipe body as described above. It is.
Also, by welding the flange to the end face of the pipe body,
Since the contact surface of the flange that welds the flange to the end surface of the pipe body is the connection end surface, it is not necessary to devise the mounting position of the flange as in claim 3.

By providing a packing on the contact surface for bringing the flanges into surface contact with each other, the connecting operation can be performed more quickly than when another packing is arranged on the contact surface.

By embedding a metal reinforcing member in the convex portion, the shape retention (strength) of the large pipe can be improved.

[0011] As the synthetic resin constituting the flange,
By using a synthetic resin having the same melting point as the synthetic resin constituting the pipe main body or substantially equal to the melting point of the synthetic resin for the pipe main body, the flange and the pipe main body are compared with the case where synthetic resins having melting points greatly different from each other are used. And the joining force with the metal can be increased.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a large-diameter tube 2 made of synthetic resin made of high-density polyethylene (other material may be used) and flanges 1 made of synthetic resin are welded to both ends by high-frequency vibration or the like. Have been. This large pipe has an inner diameter of 1000 mm and a length of 5 m, but is not limited to these dimensions. Although FIG. 1 shows the large pipe 2 having the flanges 1 welded to both ends, the large pipe 2 may have the flange 1 welded to only one end as needed. The high frequency welding by the high frequency vibration,
For example, when a material (synthetic resin) having a high dielectric constant is put in a high-frequency electric field of about 40 MHz, internal heat is generated by molecular motion. It means that the synthetic resin is welded using this dielectric heating phenomenon.

As shown in FIGS. 1 and 2, the large tube 2 has a spiral shape (an annular shape) in which convex portions 2A having a substantially triangular shape and concave portions 2B having a flat surface are alternately positioned in the tube axis direction. The tube main body 2a is formed with an inner portion 2b integrated to flatten the inner surface of the tube main body 2a. Then, a metal reinforcing material (specifically, a galvanized steel plate) 3 having a triangular shape and a strip shape (the shape may be other than that shown in the drawing) 3 is buried in the convex portion 2A to increase the shape retention strength. It does so, but it is not necessary. The shape of the convex portion 2A may be any shape such as a triangular shape, a semicircular shape, a trapezoidal shape, or a rectangular shape. or,
By making the inner surface of the large-sized pipe 2 almost flat, there is an advantage that when the wire is passed through the inside of the large-sized pipe 2, the leading end is not caught and the wire can be smoothly connected. Need not be flat.

The procedure for welding the flange 1 to the large pipe 2 will be described. As shown in FIG. 3 (a), a pipe main body 2a is prepared, and a circular ring is formed on each of the outer surfaces at both ends of the pipe main body 2a. The reinforcing base 1A made of synthetic resin (cylindrical) is thermally welded by high-frequency vibration (another method may be used) (FIG. 3).
(B)). At this time, the packing 4 having a rectangular cross section formed on the connection side end face of the one reinforcement base 1A and a semicircular rubber or resin cross section is inserted into the annular groove 1M. By doing so, the work of mounting the packing 4 one by one at the time of construction can be made unnecessary, but the packing 4 may be mounted at the time of construction.
Further, by forming the groove 1M in the reinforcing base 1A, it is possible to avoid the displacement of the packing, but the groove 1M may not be provided. In this case, the packing 4 is mounted using an adhesive or the like. The packing 4 may be a packing that contacts only a part of the flange 1 or a packing that covers the entire end surface of the flange. Next, as shown in FIG. 4A, a synthetic resin in which a plurality of bolt holes 1b are formed at appropriate intervals in the circumferential direction on the outer surface of each of the reinforcing bases 1A provided at both ends. The outer peripheral portion 1B having an L-shaped cross section is thermally welded by high-frequency vibration in the same manner as described above, so that the pipe body 2a can be provided with the flange 1. As shown in FIG.
The configuration as shown in FIG. 4A has an advantage that the area of welding to the reinforcing base 1A can be increased, but as shown in FIG. You may. The synthetic resin for producing the reinforcing base 1A and the outer peripheral portion 1B is most preferably the same synthetic resin (high-density polyethylene) as the pipe main body 2a, but the synthetic resin for the pipe main body 2a ( A synthetic resin having a melting point substantially equal to the melting point of high-density polyethylene) is preferable on the bonding surface. In addition, although it is difficult to manufacture, the one in which the reinforcing base portion 1A and the outer peripheral portion 1B are integrated may be welded to the pipe main body 2a. Further, when manufacturing the spiral pipe main body 2a as described above, the reinforcing member 3 is embedded in the convex portion 2A when cutting both ends to a predetermined length (here, 5 m). Some irregularities may occur on the end face. Therefore, the flange 1
Is welded to the pipe body 2a such that the connection side end face of the pipe body 2a is slightly closer to the connection side than the end face of the pipe body 2a (in the figure, the connection side end face of the flange 1 and the end face of the pipe body 2a are flush with each other). ), Even if the end face of the pipe main body 2a has some irregularities, it is possible to reliably connect it with the flange 1.

After the large pipe 2 formed as described above is transported to the construction site, the flat contact surfaces of the flanges 1 and 1 come into contact with each other or almost contact each other as shown in FIG. After arranging a large number of large pipes 2 along the arrangement route, the flanges 1 and 1 are tightened by bolts 5 and nuts 6 to connect the two large pipes 2 and 2 in a sealed state. Has been completed. When arranging a large pipe in a state where the flanges 1 and 1 are in contact with each other, by connecting both marks 1S and 1S provided on the side surfaces of the flanges 1 and 1 as shown in FIG. There is an advantage that the through holes 1K, 1K for the respective bolts of the two flanges 1, 1 can be aligned with the positions through which the bolts can pass, but the mark 1S may not be provided. In addition, the said mark 1S may be provided not only in one specific location of the flange 1 but in several places. The mark 1S can be provided by applying paint or the like to the outer surface of the flange 1 or can be provided by providing irregularities on the outer surface of the flange.

The large pipe 2 may be configured as shown in FIGS. 6 (a) and 6 (b). That is, the synthetic resin flange 1 formed in the shape of a donut plate having a through-hole 1K flush with the end surface of the inner portion 2b of the tube main body 2a is badly welded to the end surface of the tube main body 2a (hot plate). (Welding) or the like. Reference numeral 7 shown in FIG. 6 (a) is a reinforcing portion formed by melting and overlaying the same synthetic resin as the flange 1 and the pipe body 2 in order to increase the welding strength between the flange 1 and the pipe body 2a. Other configurations not described are the same as those described above. The hot plate welding is a process in which an adhered portion (a welded portion between the flange 1 and the pipe body) is brought into contact with a hot plate whose temperature has been adjusted, and the melted surface is pressed and held until the two are fixed. This refers to manual or mechanical welding using a heat roller or the like.

[0017]

According to the first aspect, the inner diameter is 1000.
By providing a flange on at least one end of the synthetic resin pipe body of not less than mm, not only a large number of members required for connection as in the related art are unnecessary, but also lifting of a heavy heavy pipe is not required. In addition, since the connection work can be completed only by tightening the flanges with the fasteners, it is advantageous in terms of transportation while suppressing an increase in cost, and the connection work can be easily and quickly performed. In addition to this, there is an advantage that water can be reliably stopped only by tightening flanges having flat contact surfaces. Also, by using the pressure contact force between the flanges instead of the clay-like caulking material as in the past, even if water pressure is applied to the connection portion, it is possible to prevent water from stopping and to achieve high reliability. be able to.

According to the second aspect of the present invention, the flanges are provided with positioning marks, and the large pipes are arranged while the marks are being aligned. It is not necessary to rotate the large pipes one by one, and the connection work can be performed more quickly, which is advantageous in terms of construction.

According to the third aspect, the flange is formed separately from the pipe main body with synthetic resin, and the flange formed separately is welded to the outer surface of the pipe main body, so that the flange and the pipe main body are integrally formed. As a result, it is possible to avoid an increase in the size of the manufacturing apparatus as compared with a manufacturing apparatus which performs the above.

According to the fourth aspect, the flange is formed separately from the pipe main body with synthetic resin, and the flange formed separately is welded to the end face of the pipe main body, so that the flange and the pipe main body are integrally formed. As a result, it is possible to avoid an increase in the size of the manufacturing apparatus as compared with a manufacturing apparatus which performs the above. Also, by welding the flange to the end face of the pipe main body, the contact surface of the flange for welding the flange to the end face of the pipe main body becomes the connection end face. This is unnecessary, which is advantageous in terms of manufacturing.
In addition, there is an advantage in that it is easier to manufacture by welding to the end face of the tube body which is a vertical surface, as compared with the method of welding to the uneven outer surface of the tube body as in claim 3.

According to the fifth aspect, by providing the packing on the contact surface for bringing the flanges into surface contact with each other, the connection operation can be performed more quickly than when another packing is disposed on the contact surface. The construction time can be shortened.

According to the sixth aspect, by embedding a reinforcing member made of metal in the convex portion, the shape retention (strength) of the large pipe can be improved.
And the durability can be improved as compared with the conventional concrete fume pipe.

According to the seventh aspect, the synthetic resin constituting the flange is made of a synthetic resin having the same melting point as the synthetic resin constituting the pipe body or having a melting point substantially equal to the melting point of the synthetic resin for the pipe body. The joining force between the flange and the pipe main body can be increased as compared with the case where a synthetic resin having a large difference is used, which is advantageous in terms of durability.

[Brief description of the drawings]

FIG. 1 is a side view in partial section of a large pipe.

FIG. 2 is a sectional view of a main part of a large pipe.

FIG. 3A is a partially cutaway side view of a pipe main body, and FIG. 3B is a partially sectional side view showing a state where a reinforcing base is welded to both ends of the pipe main body.

FIG. 4 (a) is a partially sectional side view showing a state in which an outer peripheral portion is welded to an outer surface of a reinforcing base portion, and FIG. 4 (b) is a side view of the reinforcing base portion having a shape different from that of FIG. It is the side view which was made into the partial section which shows the state where the outer peripheral part was welded.

FIG. 5 is a partially sectional side view showing a state where two large pipes are connected.

FIGS. 6A and 6B show a large-sized pipe having another shape, wherein FIG. 6A is a longitudinal side view of one end of the large pipe, and FIG. 6B is a front view thereof.

7A and 7B are explanatory views showing a process of connecting a large pipe with a conventional half joint, wherein FIG. 7A shows a state in which a packing sheet is set on a lower half joint, and FIG. A state where two large pipes are arranged in a state where their ends are in contact with each other is shown, (c) shows a state filled with a caulking material, and (d) shows a connection completed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange 1A Reinforcement base 1B Outer circumference 1b Bolt hole 1K Through hole 1M Groove 1S Mark 2 Large pipe 2A Convex part 2B Concave part 2a Tube body 2b Inside part 3 Reinforcement material 4 Packing 5 Bolt 6 Nut 7 Reinforcing part 21 Flange 22 Half Split joint 23 Packing sheet 24 Large pipe 25 Caulking material 26 Half joint 28 Bolt 29 Nut

Claims (7)

[Claims] 1. A pipe connection at least at one end of a spirally or annularly formed pipe body made of a synthetic resin having an inner diameter of 1000 mm or more and having convex portions and concave portions alternately arranged in the tube axis direction. A large pipe equipped with a flange. 2. The large pipe according to claim 1, wherein said flange is provided with an alignment mark. 3. The large pipe according to claim 1, wherein the flange is formed of a synthetic resin separately from the pipe main body, and the separately formed flange is welded to an outer surface of the pipe main body. 4. The large pipe according to claim 1, wherein the flange is formed separately from the pipe main body with a synthetic resin, and the separately formed flange is welded to an end face of the pipe main body. 5. The large pipe according to claim 1, wherein a packing is provided on a contact surface for bringing the flanges into surface contact with each other. 6. The large pipe according to claim 1, wherein a metal reinforcing member is embedded in the projection. 7. The synthetic resin forming the flange is made of the same synthetic resin as that of the tube main body or a synthetic resin having a melting point substantially equal to the melting point of the synthetic resin for the tube main body. Item 3. A large pipe according to item 3 or 4.