KR20070013504A - Combined pipe and method for manufacturing the same - Google Patents

Abstract

A composite pipe for a water passage is provided to prevent corrosion and reduce constructing cost according to the composite of concrete, steel, and synthetic resin sheets with excellent endurance for outer pressure and inner water pressure. A composite pipe(1) for a water passage comprises a steel pipe(10) formed with the water passage to counteract the inner pressure; and multi-stage concrete pipes(20) connected with the outside of the steel pipe as a block unit to counteract the outer pressure when buried in the ground. A synthetic resin pipe(30) is installed in the steel pipe to improve corrosion resistance and strength. A tolerance is formed between the external diameter of the steel pipe and the internal diameter of the multi-stage concrete pipe to easily insert the concrete pipe.

Description

Combined Pipe and Method for Manufacturing The Same

1 shows a conventional composite tube,

(a) is a perspective view

(b) is sectional drawing which shows construction condition

Figure 2 is a perspective view of the water pipe complex pipe according to the present invention

Figure 3 is a cross-sectional view showing a connection construction state of the composite pipe of the present invention

Figure 4 is a front view showing a composite tube of the present invention

5 is a cross-sectional view showing a modification of the composite pipe of the present invention of FIG.

6 is a cross-sectional view showing another modified example of the composite pipe of the present invention of FIG.

7 illustrates the use of a reinforcing member in the composite pipe of FIG. 5,

(a) a perspective view of the main part

(b) section

8 is a cross-sectional view showing a composite pipe of another embodiment of the present invention.

9 is a cross-sectional view showing a composite pipe of another embodiment of the present invention.

10 is a cross-sectional view showing a composite pipe of another embodiment of the present invention.

11 is a cross-sectional view showing a composite pipe of another embodiment of the present invention.

Figure 12 (a)-(d) is a schematic diagram showing a manufacturing step based on the present invention composite tube of Figure 8

Figure 13 is a block diagram showing a composite pipe manufacturing state of the present invention of Figure 9

Explanation of symbols on the main parts of the drawings

1 .... composite pipe 10 .... steel pipe

14,17 .... Annular recess 20 .... Concrete pipe

30 .... plastic tube 40 .... binder means

50 .... Tube holder 60 .... Sealing seat

70 .... Shrinkage-expansion compensation means 80 .... Socket tube

82 .... Socket 94 .... Mold

The present invention relates to a combined pipe (combined pipe) used for water passages, such as water and sewage pipes, and more specifically, it consists of a composite of concrete, steel, synthetic resin pipes sufficiently resistant to external pressure and internal water pressure to increase the service life of the pipe. As well as prolonging corrosion, and preventing corrosion, and reducing the thickness of pipes of water and sewage pipes made of concrete or cast iron pipes with complex complementary action, it is possible to reduce the cost and constructability of overall pipe production, handling and construction. Of course, it relates, in particular, to a composite channel for a water channel, which makes it very easy to extend or adjust the length of the tube while producing a composite tube and a method of manufacturing the same.

Hume-pipes are usually made of concrete and are made of pipes with a water passage secured inside them, and are buried in the ground of the relevant construction site where necessary, and are mainly used for sewage, but water, sewage, sewage, and wastewater. It is also used for drainage pipes.

On the other hand, the inner surface of the fume pipe is a synthetic resin coating layer for the reinforcement, for example, to prevent erosion or corrosion of the inner surface of the fume pipe due to the water pressure or impact of the fluid flowing through the inside, for example, excellent corrosion resistance And it is common that the coating layer of the synthetic resin, for example, polyethylene (PE), which is easy to process and construct is applied.

Next, a synthetic resin coating layer may be provided inside the cast iron pipe that is used for a large water pipe.

However, when the fume pipe is buried in the ground, the external pressure due to the pressure is applied to the fume pipe, and as the use continues, such an external pressure may increase.

This piece, such a fume pipe is usually made of concrete pipe, such a concrete pipe is high in compressive strength to withstand the external pressure, but the tensile strength to the internal pressure by the hydraulic pressure is weak.

Therefore, since the concrete fume pipe by water pressure ruptures even if the internal pressure is a little high, it must have a thickness more than a certain level, and is usually used for sewage pipes with weak internal water pressure.

In addition, when the steel pipe, that is, cast iron pipe, is buried in the ground, since the compressive and tensile strength is higher than that of the concrete fume pipe, the thickness thereof is reduced compared to the fume pipe, and it can withstand the external pressure or the internal pressure to some extent.

However, since cast iron pipes are higher in strength than fume pipes, instead of being thin, parts of the pipes, especially end portions, are easily distorted during construction, and cast iron pipes with such distorted ends are difficult to connect. Install with a support to prevent slipping.

On the other hand, in the use of a composite pipe having both a concrete tube strong against external pressure and a steel tube (cast iron pipe) resistant to internal and internal pressures, but easily crushed, and a cylindrical synthetic resin pipe (sheet) therein, complementary action It will be possible to reduce the overall thickness, Figure 1 shows such a conventional composite tube, such a composite tube is disclosed in detail in the patent application No. 10-2005-60389 filed by the applicant of the present application in Korea.

That is, as shown in FIG. 1, the concrete pipe 120 is integrally molded to the outside of the cast iron pipe 110, and the inside of each flange part 112 is provided with a synthetic resin pipe (sheet) 130 or a coating layer therein. The construction is connected through the 132).

Therefore, the composite pipe 100 is such that the concrete pipe 120 is opposed to the external pressure, such as acupressure when buried underground, the cast iron pipe 110 and the synthetic resin pipe 130 is opposed to the internal water pressure, respectively, the thickness of each pipe complement each other The strength is maintained by the action.

However, such a conventional composite pipe is to integrally mold the concrete pipe 120 to the outside of the cast iron pipe 110, such as a mold, it was practically impossible to produce a unit length of the composite pipe longer than 6m.

Therefore, to manufacture a composite pipe, but in order to increase the length of the concrete pipes are connected to each other in units of blocks, only the steel pipes are produced integrally while filling and molding mortar, etc. by the shot method between the concrete pipes and steel pipes It would be desirable to be able to easily stretch or adjust the length of to a desired state.

The present invention is to solve the above-mentioned conventional problems, and extend the service life of the tube, as well as the thickness of the tube, as well as easy to elongate or adjust the length of the water pipe to facilitate the manufacture and construction of the overall long width composite tube The purpose is to provide a furnace composite pipe and a method of manufacturing the same.

The present invention as a technical aspect for achieving the above object, the steel pipe against the internal pressure while forming a water passage; And,

A plurality of concrete pipes provided with a plurality of block units connected to the outside of the steel pipe to counter the external pressure when the underground is buried;

It provides a composite pipe for the channel consisting of a.

In addition, the present invention as another technical aspect, the step of connecting to arrange the concrete unit of the block unit in the desired length while fixing the pipe fixing means; And

Inserting the steel tube integrated into the interior of the concrete pipes arranged while maintaining a constant distance from the concrete pipes, inserting the forming mold on both sides of the pipe, the binder means in the space between the steel pipe and the concrete pipe Filling and molding by the shot method to integrally bind (combine) the concrete pipe and the steel pipe;

It provides a method for manufacturing a composite pipe for a channel consisting of.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, Figures 2 to 4 show an embodiment of the present invention composite pipe in a perspective view, a cross-sectional view and a front view of the pipe connection state.

That is, as shown in Figures 2 and 3, the composite pipe (1) of the present invention, while forming a water flow passage against the internal pressure, that is, high water pressure, for example, 5-20 kg / ㎠ Steel tube 10 to withstand pressure, and the concrete pipe 20 to counter the external pressure when buried in the ground while being provided in multiple stages in units of blocks on the outside of the steel tube 10, the steel further It may be provided in close contact with the inside of the tube 10 may include a synthetic resin tube 30 to further increase the strength and corrosion resistance.

Therefore, in the composite pipe 1 of the present invention shown in Figures 2 to 4, the external pressure applied after the soil is buried to withstand the concrete pipe 20 excellent in compressive strength, the internal pressure of the hydraulic pressure is the tensile strength Resistant against good steel tube (10), and further, plastic tube 30 is designed to withstand corrosion or additional internal pressure.

In particular, the composite pipe (1) of the present invention is the concrete pipe 20 against the external pressure is not integrally molded on the outer surface of the steel pipe 10, the concrete pipe 20 in a pre-fabricated state in block units Since it is manufactured by assembly, even if the length of the composite pipe is more than 6m long, it is easy to manufacture, which facilitates the manufacture of the composite pipe, in particular, because the additional connection construction of the block unit concrete pipe 20 is possible, the total length of the composite pipe Adjustments will also be very easy.

At this time, the composite pipe of the present invention because the connection construction of the pipe by welding the inner end of the steel pipe during the connection construction of the pipe, for this purpose corresponds to a large diameter of 900 mm or more.

Next, looking at the composite pipe (1) of the present invention in more detail, as shown in Figures 3 and 4, the integral steel pipe (10) against the internal pressure while forming a water passage and the outside of the steel pipe A plurality of block units are connected to each other so that the block-type concrete pipe 20 is opposed to the external pressure when the underground is buried, and the plastic pipe 30 is further provided to further improve corrosion resistance and strength while being provided inside the steel pipe. It is composed.

At this time, the tolerance (H1) is formed between the outer diameter of the steel tube 10 and the inner diameter of the concrete unit 20 of the block unit provided to the outside to facilitate the insertion of the concrete tube of the steel tube.

In addition, the concrete unit 20 of the block unit also has a tolerance (H2) is formed between the horizontal side.

Therefore, the binder means 40 which combines the pipes integrally to increase the bonding strength in the space formed by the tolerance H1 between the steel tube 10 and the concrete tube 20 and the tolerance H2 between the concrete tubes. ) May be fill molded.

Therefore, as shown in Figures 3 and 4, the composite pipe 1 of the present invention is connected to the outside of the steel pipe 10 in which a plurality of concrete pipes 20 are integrated in a block unit length of the total composite pipe While facilitating elongation or adjustment, the bonding strength can also be maintained through the binder means 40.

In this case, the binder means 40, one of the non-shrinkage mortar or resin adhesive that is filled by the shot method in the space between the tolerance (H1) (H2) may be used, for example, mortar is also referred to as cement mortar Only cement and sand are mixed at a ratio of about 1: 3, and water is poured from a city factory.

However, it is necessary to use non-shrink mortar of a property that does not shrink after curing, and there are lime mortar, asphalt mortar, resin mortar, vermiculite mortar, perlite mortar, and the like.

Next, in the case where the binder means 40 uses a resin adhesive, an adhesive, for example, an epoxy resin adhesive that is polymerized by a polymerization reaction after being filled with a low molecular liquid such as cyanoacrylate, bisacrylate, etc. Etc. may be used.

At this time, in the case of using the binder means 40 which is a non-shrinkable mortar, the bonding strength of the composite pipe of the present invention will be kept strong, on the contrary, in the case of using the binder means 40 of the resin adhesive, the strength is weak in terms of external pressure. Since it is equipped with concrete and steel tubes against overpressure, there is no problem in use, and rather, resin adhesives provide other advantages of mitigating water shock or preventing corrosion of concrete parts due to damage to each part of the steel tube. something to do.

Meanwhile, as shown in FIGS. 3 and 4, seating portions 22 formed in the circumferentially concave direction are formed at both end portions of the concrete units 20 of the block unit in which the binder means are formed. It is formed at the time, the annular seating portion 22, the pipe fixing means 50, for example, the steel band is fastened and fixed to increase the strength of the connection portion of the concrete pipes, and when filling the short method of filling the mortar or resin adhesive described above To prevent leakage.

On the other hand, as shown in Figure 6, it is also possible to fasten and fix the pipe fixing means 50, which is a steel band, to the outside of the connection portion of the concrete pipe without a seating portion.

Next, as shown in Figure 3 and 4, in the composite pipe of the present invention when the combined construction of the steel tube 10 and the concrete unit 20 of the block unit of the outer block is completed, the inside of the steel tube 10 Providing the synthetic resin pipe 30 is provided on the surface in close contact will further improve the strength and corrosion resistance.

At this time, the synthetic resin tube 30 will be able to provide a cylindrical synthetic resin tube or sheet prepared in advance by welding the edges in the cylindrical form at the construction site of the composite tube.

In addition, in the composite tube 1 of the present invention, the synthetic resin tube 30 may be a synthetic resin layer applied to the inside of the steel tube. In this case it will be provided in advance as a plastic coating layer in the production of steel tubes.

At this time, when the composite pipe (1) of the present invention is connected, as shown in Figure 3, the inner end 12 of the steel pipe 10 is welded (W1) by a conventional welding method is a connection construction of the pipe is made .

3, W1 of FIG. 3 shows the welding site of a steel pipe, and W2 shows the heat welding welding site of a synthetic resin pipe.

On the other hand, when the connection of the steel pipe 10, the end portion 32 of the synthetic resin pipe 30 should be spaced apart from the welding portion (W1), which means that the synthetic resin pipe 30 is thermally damaged when welding the steel pipe It is to prevent.

In addition, as shown in FIG. 3, the sealing sheet 60 may be welded (W2) between the ends of the synthetic resin tube 30 when the composite pipes are connected.

In this case, since the sealing sheet 60 is constructed by connecting the synthetic resin pipes 30 with the same material as the synthetic resin pipe 30, the strength of the pipe and, of course, will provide an advantage of blocking leakage.

Next, as shown in Figure 5, the composite pipe 1 of the present invention is provided with an annular concave portion 17 of the inner diameter is extended to the center side of the steel tube 10, the synthetic resin tube 30 is Corresponding to the recessed portion 17 of the steel tube 10, the shrinkage-expansion compensation means 34, that is, the uneven portion can be integrally formed.

Therefore, when the composite pipe (30) is exposed to a high temperature state before construction in the composite pipe (1) and is buried in the ground and the temperature is sharply lowered, the synthetic resin pipe (30) is excessively contracted, and at the same time the sealing sheet (60) Short circuit of the synthetic resin tube 30 easily occurs in the state of being connected to the uneven portion, which is a contraction-expansion compensation means 34 of the synthetic resin tube 30 in the space A formed in the concave portion 17 of the steel tube. The flow prevents the breakage of the synthetic resin pipe 30 due to excessive shrinkage or expansion rate difference.

Then, the shrinkage-expansion rate difference between the steel tube 10 and the synthetic resin tube 30 will be compensated.

Next, Figure 7 shows the reinforcing member 26 provided in the present invention composite pipe, the reinforcing member 26 is inserted into the hole 24 formed in the circumferential direction on the side of the concrete pipe 20 to be connected to each other As the iron mall, as shown in Figure 6b to increase the strength of the overlap between the concrete pipes during the manufacture of the tube.

Of course, the mortar or resin adhesive, which is the binder means 40, is filled and molded between the reinforcing member 26 and the holes 24, and thus, the bonding strength of the reinforcing member and the concrete pipe will be improved.

Next, FIG. 8 shows another embodiment of the composite pipe of the present invention.

That is, as shown in Figure 8, both ends of the steel tube 10 is provided with an annular recess 14 which is concave along the circumference as the inner diameter is extended, the contact portion of the recess is weld (W1) The sealing sheet 60 is welded (W2) between the end 32 of the inner synthetic resin tube 30 of the steel tube (10).

Accordingly, the space A is formed in the recess 14 of the steel tube 10, and the steel sheet (10) flows in the space A to the sealing sheet 60 welded between the synthetic resin tubes 30. Shrinkage-expansion compensation means 70 may be provided which makes it possible to compensate for the shrinkage-expansion rate difference between 10) and the synthetic resin tube 30, such shrinkage-expansion compensation means 70 being integral to the sealing sheet. It may be provided as an uneven portion formed.

Therefore, if the synthetic resin tube 30 is tightly inserted into the inner surface of the steel tube 10, and if the sealing sheet 60 is excessively contracted than the steel tube while the sealing sheet 60 is connected, shrinkage-expansion compensation of the sealing sheet 60 The means 70 compensates for the shrinkage-expansion rate difference between the steel tube and the resin tube while flowing in the space A, for example, to prevent the plastic sheet from shrinking excessively and to short-circuit the sealing sheet or the welded portion. The part will increase the impact resistance of the sealing sheet and will also prevent damage.

Next, Fig. 9 shows another modification of the composite pipe of the present invention.

That is, as shown in FIG. 9, one of the convex concrete pipes 20 made of the composite pipe is provided as the socket pipe 80, and the socket type composite pipe 1 is provided.

At this time, as shown in Figure 9, corresponding to the socket portion 82 of the socket tube 80, the inner steel tube 10 includes a bent end (16).

Of course, the steel tube bent end 16 is provided in advance at the end of the steel tube 10 during the pre-production of the steel tube 10, the bent end 16 is bent and the sealing described later in the It provides a flow space (B) of the concave-convex portion that is the sheet compensation means.

Then, the site of contact with the steel tube end portion 12 of the adjacent composite pipe during welding of the composite pipe is welded (W1).

Then, the sealing sheet 60 is welded (W2) between the steel tube inner synthetic resin tube 30, the sealing sheet 60 may be formed integrally with the shrinkage-expansion compensation means (70).

In addition, the socket end of the socket tube 80 may be in close contact with the pipe fixing means seating portion 22 of the adjacent straight tube-shaped concrete pipe 20 can be firmly connected construction.

Therefore, the composite pipe 1 of the present invention shown in Figure 9 is provided in the form of a socket to facilitate the connection construction.

In this case, the synthetic resin pipe 30 in the various types of composite pipe 1 described so far may be provided as polyethylene (PE), high density polyethylene (HDPE) or fiber reinforced plastic (FRP).

Next, FIG. 10 shows a steel tube 10 and a synthetic resin tube 30 having a flange portion.

That is, as shown in Figure 10, when the cylindrical steel tube 10 is inserted into the concrete unit 20 of the block unit, the flange portion 18 on one side or both ends of the steel tube 10 Welding (W1), and the flange portion 36 is welded (W2) to both ends of the synthetic resin pipe 30 is provided in close contact with the inside of the steel pipe (10) similarly to the steel pipe.

Accordingly, the composite pipe 1 of the present invention of FIG. 10 bolts the flange portions 18 and 36 of the steel pipe and the synthetic resin pipe without welding the inner end of the steel pipe as shown in FIG. It can be fastened and connected construction, which will facilitate the connection construction of the pipe.

In particular, since the flange fastening type composite pipe 1 shown in FIG. 10 only needs to fasten the flange portions from the outside of the pipe, there is no problem in applying to a small composite pipe having an inner diameter of 600 mm or less.

At this time, as shown in FIG. 5, an annular recess 17 is formed in the center of the steel tube 10, and the contraction-expansion compensating means 34 flowing in the recess space A includes the synthetic resin tube 30. It can be formed integrally, and in this case it is prevented by excessive contraction or expansion of the synthetic resin tube, or short circuit due to the difference between the steel tube.

Next, FIG. 11 shows another embodiment of the composite pipe 1 of the present invention, which is characterized by using the corrugated pipe 10 'as a steel pipe.

That is, as shown in FIG. 11, when the corrugated pipe 10 'is used as a steel tube, the corrugated pipe itself is light in weight and excellent in strength, thereby making it convenient to use.

At this time, the corrugated pipe 10 'is a known pipe.

Next, FIG. 12 illustrates a composite pipe manufacturing step based on the composite pipe of FIG. 8, which will be described below.

First, as shown in FIG. 12A, a plurality of concrete pipes 20, for example, in which annular seating portions are formed in advance, for example, conventional concrete fume pipes are successively placed on a table 92 provided with rollers 92a. Using the steel band of the pipe fixing means (50) to the desired number based on the connection to connect while fixing.

Next, as shown in FIG. 12B, the forming mold 94 moving as the bogie 94a is moved to the reference point P1 while maintaining the tolerance H2 between the concrete pipes 20. The forming mold 94 is horizontally provided with a jig 96 having supporting rods 96a for entering the concrete pipe of the steel pipe.

Therefore, the jig 96 of the center of the molding frame is located on the inner center side of the concrete pipe 20 connected as a steel band, which is the pipe fixing means 50, and the steel pipe 10, that is, the recess 14, is located on both sides. For example, the steel pipe 10 formed at the end, for example, the cast iron pipe is seated and supported by the jig 96 into the interior of the concrete pipe 20 connected in units of blocks, wherein the constant tolerance (H2) between the concrete pipe and the steel pipe Is maintained.

Next, as shown in FIG. 12C, the other forming die 94 is placed on the opposite side to the opposite reference point P2, and the end of the jig 96 is supported by the opposite forming die 94.

Next, the concrete pipe 20 through the pipe 98a connected to the binder means 40 such as mortar or resin adhesive through the hole (not shown) formed in the molding die 94 using the shot filling mechanism 98. Filling and integrally formed in the space between the steel pipe 10 and the space between the concrete blocks.

Next, as shown in FIG. 12D, the composite pipe 1 prepared in advance while being inserted into the steel tube 10 while being in close contact with the synthetic resin tube 30 in an interference fit manner is manufactured.

And, when connecting the composite pipe (1) as shown in Figure 8, the inner weld end portion 12 of the steel pipe (10) in a conventional way (W1), and the synthetic resin pipes 30 therebetween thereon. The sealing sheet 60 having the shrinkage-expansion compensation means 70, which is an uneven portion, may be welded (W2) in the form of heat welding to complete the connection construction of the pipe.

At this time, as shown in Figure 3, 8, etc., the connection portion of the composite pipe, that is, both ends of the concrete pipe using a steel band and a separate fastener 50 'can be more robust to the connection construction structure of the composite pipe will be.

Next, Figure 13 shows the manufacturing step of the socket-type composite pipe (1), when the support protrusion (94a ') is formed to match the inner surface of the one side forming mold (94') to the bent end of the steel tube 16 of the socket There is no difference from the 12 manufacturing steps.

At this time, using the molding frame to move the balance of Figures 12 and 13 is only one example, but is not necessarily limited thereto.

As described above, according to the present invention, the composite channel for a water channel and a method for manufacturing the same are made of a composite of concrete, steel, and synthetic resin sheets that are easy to manufacture a long-length composite pipe having a very long length and sufficiently endure external pressure and internal water pressure. Of course, the corrosion is prevented, and the thickness of the upper and sewer pipes made of existing concrete or cast iron pipes can be reduced by a complex complementary effect, reducing the cost and constructability of the overall pipe production, handling and construction. Provides an excellent effect of improving.

Next, the length of the pipe can be elongated while the composite pipe is manufactured, of course, since the external concrete pipe is connected in units of blocks, it provides another excellent effect of the production and productivity of the pipe.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (26)

A steel pipe against internal pressure while forming a water passage; And, A plurality of concrete pipes provided with a plurality of block units connected to the outside of the steel pipe to counter the external pressure when the underground is buried; A composite pipe for the channel consisting of a. The composite pipe of claim 1, further comprising a synthetic resin pipe that is closely attached to the inside of the steel pipe to improve corrosion resistance and strength. The composite pipe according to claim 1, wherein a tolerance is formed between the outer diameter of the steel pipe and the inner diameter of the multistage concrete pipe provided outside thereof to facilitate the insertion of the concrete pipe of the steel pipe. The composite pipe according to claim 3, further comprising binder means integrally formed in the space between the steel pipe and the concrete pipe due to the tolerance to increase the bonding strength of the pipes. The composite pipe according to claim 4, wherein a space due to a tolerance is formed between the concrete pipes, and the binder means is integrally formed in the space. The composite pipe according to claim 4 or 5, wherein the binder means is one of non-shrinkable mortar or resin adhesive which is filled and molded into the space between the steel pipe and the concrete pipe and the concrete pipe by a shot method. According to claim 1, The composite pipe further comprises a pipe fixing means fastened to the connection portion of the concrete pipe. According to claim 7, The pipe fixing means is composed of a steel band, Composite pipes, characterized in that the mounting portion is formed integrally to the pipe fixing means on both ends of the concrete pipe. The composite pipe according to claim 1, wherein the inner surface contact end of the steel pipe is welded to connect the pipe. 10. The composite pipe according to claim 9, wherein a sealing sheet is additionally welded between ends of the synthetic resin pipe provided in close contact with the steel pipe when the pipe is connected. 2. The composite pipe according to claim 1, wherein both ends of the steel tube are integrally provided with an annular recess having an inner diameter extending therebetween, and a contact portion of the steel tube is welded. 12. The method of claim 11, wherein the sealing sheet is additionally welded between the ends of the synthetic resin tube provided in close contact with the inside of the steel pipe during the connection of the pipe, the sealing sheet flows in the space formed by the steel tube recess And a shrinkage-expansion compensation means for compensating for a shrinkage-expansion rate difference between the steel tube and the synthetic resin tube. 11. The method of claim 10, wherein the center of the steel tube is formed integrally with an inner diameter extending concave portion, the synthetic resin tube is flowable in the space formed by the concave portion shrinkage-expansion rate difference between the steel tube and the synthetic resin tube Composite tube characterized in that it comprises a shrink-expansion compensation means to compensate. The composite pipe according to claim 1, wherein reinforcing members are further provided at connection portions of the concrete pipe units in the block unit. The composite pipe according to claim 1, wherein at least one of the convex concrete pipes is composed of a socket pipe that enables connection construction of the pipe in the form of a socket. The composite pipe according to claim 15, wherein the inner steel pipe corresponding to the socket part at one end of the socket pipe includes a bent end. 17. The composite pipe according to claim 16, wherein an end portion of the adjacent steel tube having a straight tube shape and a bent end portion of the socket tube are welded to connect the pipe. 18. The composite pipe according to claim 17, wherein a synthetic resin tube is closely attached to the welded portion of the steel tube, and a sealing sheet is additionally welded between the synthetic resin tubes. 19. The method of claim 18, wherein the sealing sheet is further provided with shrinkage-expansion compensation means for flowing in the inner space of the bent end of the steel tube to compensate for the shrinkage-expansion rate difference between the steel tube and the synthetic resin tube Composite pipe. The method of claim 2, wherein both ends of the synthetic pipe provided on the inner surface of the steel pipe and the steel pipe is connected to each other after the concrete pipe of the steel pipe is welded and is connected to each other during the construction of the pipe joint is provided Composite pipe. 21. The method of claim 20, wherein the center of the steel tube is formed integrally with an annular concave extending the inner diameter, the synthetic resin tube can flow in the space formed by the concave to shrink between the steel tube and the synthetic resin tube A composite tube comprising shrinkage-expansion compensation means for compensating for a difference in expansion rate. 22. The composite pipe according to any one of claims 12, 13, 19 and 21, wherein the shrinkage-expansion compensation means is an uneven portion provided integrally with the sealing sheet or the resin pipe. The composite pipe according to claim 1, wherein the steel pipe is one of a cast iron pipe and a corrugated pipe. Connecting and arranging block units of concrete pipes to a desired length while fixing the pipe fixing means; And Inserting the steel tube integrated into the interior of the concrete pipes arranged while maintaining a constant distance from the concrete pipes, inserting the forming mold on both sides of the pipe, the binder means in the space between the steel pipe and the concrete pipe Filling and molding by the shot method to integrally bind (combine) the concrete pipe and the steel pipe; Method for producing a composite pipe for a water channel, characterized in that consisting of. 25. The method of claim 24, further comprising the step of removing the mold and inserting a synthetic resin tube into the steel tube. 25. The method according to claim 24, wherein the binder means uses one of non-contraction mortar or a resin adhesive.

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