KR200261633Y1 - Reinforced double walled pipe - Google Patents

Abstract

The present invention relates to the structure of a double walled pipe (Double Walled Pipe), characterized in that it further comprises a reinforcing structure having a 'Y' shape, etc. along the circumferential surface in the hollow portion 1 forming the wall surface of the double wall pipe. And, by providing the above reinforcement structure for the purpose of increasing the rigidity of the pipe.

Description

Reinforced double walled pipe}

The present invention relates to the structure of a double wall pipe, and more specifically, a double wall pipe having a hollow portion (1) at regular intervals inside a wall of a non-pressure pipe widely used for a sewer pipe, a drain pipe, an agricultural water pipe, and the like. In addition, the present invention relates to a structure of a double wall tube further provided with a reinforcing structure whose cross section is 'Y' shape or the like along the circumferential surface in the hollow part 1 to increase the rigidity of the tube.

The double wall pipe according to the prior art in this field is manufactured by extruding a hollow small square synthetic resin pipe, rolled into a coil shape, and fusion-bonded with an adhesive resin, and has a cross-sectional structure of FIG. The double-walled pipe manufactured as described above is intended to improve the transport and construction properties due to the reduction in production cost and the light weight due to the hollow part 1 forming the wall of the pipe.

However, the double walled pipe is a factor that lowers the load strength of the pipe due to the hollow portion 1, so that it is not able to withstand the earth pressure or lubrication pressure and is damaged, such as the durability of the pipe. As shown in FIG. 2, an improved double wall pipe having an increased rigidity of the pipe is further provided with a reinforcing structure 2 having a '+' cross section along the circumferential surface of the hollow part 1 constituting the wall of the double wall pipe. While this is commercially available, it has a closed end where the rigidity increase of the tube is not large compared to the increase in the weight of the tube due to the additional reinforcing structure.

The present invention is to solve the above problems by providing a reinforcing structure by additionally providing a reinforcing structure whose cross section is 'Y' shape, etc. along the circumferential surface in the hollow part 1 forming the wall of the double wall pipe. The purpose is to increase the rigidity of the tube while minimizing the weight increase of the tube.

1 is a perspective view showing a partial cross-sectional view of a conventional double wall pipe

Figure 2 is a perspective view showing a partial cross-section of the conventional double wall tube of the improved form

Figure 3 is a perspective view showing a partial cross-section of the rigid wall reinforced double wall of the present invention

Figure 4 is a perspective view showing a partial cross-sectional view showing another embodiment of the double wall tube reinforced with rigidity of the present invention

5 is a perspective view showing a partial cross-sectional view showing another embodiment of the stiffened double-walled pipe of the present invention

* Explanation of symbols used in the main part of the drawing

1: hollow part

2: Reinforcement structure of '+' shape

3: Reinforcement structure of 'Y' shape

4: Reinforcement structure of shape by connecting two 'Y' shapes up and down

5: Reinforcement structure of the shape where the upper part is filled in 'Y' shape

The double-walled pipe of the present invention for achieving the above object is to be formed by extrusion molding with a synthetic resin material, and further includes a reinforcement structure along the circumferential surface inside the hollow part 1 forming the wall surface of the pipe as shown in FIG. The reinforcement structure described above includes a reinforcement structure 3 having a 'Y' shape, and a reinforcement structure 4 having a shape in which two modified 'Y' shapes are connected up and down, and an upper portion thereof in a 'Y' shape. Application of the reinforcement structure 5 of the filled shape is possible.

According to ASTM D2412, the rigidity PS of the pipe is calculated by the following equation.

Where PS = tube stiffness (kgf / cm ^ 2), E = modulus of elasticity (kgf / cm ^ 2), I = cross-sectional secondary moment per unit length (cm ^ 4 / cm), R = Center radius (cm)

Based on the above formula, the rigidity of the example of the prior art and the example to which the present invention was applied was calculated based on the double wall pipe having an inner diameter of 600 mm.

Comparative Example 1

The rigidity and weight of the conventional double walled tube having the form of FIG. 1 were calculated. The results are shown in Table 1.

Comparative Example 2

The stiffness and weight of the double wall tube having the form of FIG. The results are shown in Table 1.

Example 1

In the embodiment to which the present invention was applied, the stiffness and weight of the stiffened double wall tube having the shape of FIG. 3 further including the reinforcing structure 3 having a 'Y' cross section was calculated. The results are shown in Table 1.

Example 2

In the embodiment to which the present invention is applied, the stiffness and weight of the stiffened double wall pipe having the shape of FIG. 4 further including a reinforcing structure 4 having a cross section connecting two 'Y' shapes up and down, is calculated. It was. The results are shown in Table 1.

Example 3

In the embodiment to which the present invention is applied, the stiffness and the weight of the stiffened double wall tube having the shape of FIG. It was. The results are shown in Table 1.

Rigidity (kgf / ㎠) Weight (kg / m) Comparative Example 1 5.26 (100%) 34.6 (100%) Comparative Example 2 5.60 (106%) 43.6 (126%) Example 1 5.87 (112%) 43.1 (124%) Example 2 6.26 (119%) 43.4 (125%) Example 3 6.59 (125%) 46.9 (135%)

As is apparent from Table 1, Examples 1 to 3 it can be seen that the rigidity of the tube is excellent compared to the increase in the weight of the tube with the additional reinforcement structure than Comparative Example 2.

As described above, according to the present invention, by adding a reinforcing structure having a 'Y' shape or the like along the circumferential surface inside the hollow part constituting the wall surface of the double wall pipe, the weight increase of the pipe according to the additional reinforcing structure is provided. By maximizing the increase in rigidity of the pipe, it is possible to provide a double wall pipe with increased rigidity of the pipe while maintaining the advantages of raw material reduction and light weight.

Claims (3)

In the structure of a double-walled tube having a hollow portion at regular intervals inside the wall surface by extrusion molding, the overall shape is made of a synthetic resin material; A double-walled tube reinforced with stiffness, characterized in that it further comprises a reinforcing structure (3) in the cross-section of the 'Y' shape along the circumferential surface inside the hollow portion forming the wall surface of the tube. The method of claim 1; The double-walled tube reinforced with stiffness, characterized in that it further comprises a reinforcing structure (4) of the shape of connecting the two 'Y' shape up and down along the circumferential surface in the hollow portion constituting the wall of the tube. The method of claim 1; A double-walled tube with stiffness, characterized in that it further comprises a reinforcing structure (5) in the shape of the upper portion of the hollow portion forming the wall surface of the tube along the circumferential surface of the 'Y' shape.