KR102198803B1 - Flange integral type corrugated steel pipe - Google Patents

Abstract

The present invention relates to a corrugated steel pipe in which a flange for a pipe joint is integrally formed, and a steel pipe 10 having a set length and formed with a bent piece 11 in an outward direction on the end, and at the end of the steel pipe 10 It consists of a flange 20 that is welded and integrally formed with the bent piece 11, and a connecting member 30 interposed in the upper flange 20 to induce connection, and the upper flange 20 is a connecting member ( It consists of a locking jaw (21) that receives pressure from 30), and a joint surface (25) that engages with a joint object to induce a pipe joint on one side, and the upper joint surface (25) engages with the joint object and protrudes to seal the joint. It is characterized in that it is divided into a section (25a) and an avoiding section (25b) which is depressed to increase the joint pressure acting on the upper airtight section (25a).
Accordingly, the present invention divides the joint surface of the flange welded with an unavoidable thickness to satisfy the set standard into a protruding section that engages with other flanges and a depressed section that is avoided, thereby increasing the joint pressure per unit area applied to the protruding section. In addition, there is an effect of reducing manufacturing cost by minimizing the welding raw material.

Description

Flange integral type corrugated steel pipe}

The present invention relates to a corrugated steel pipe in which a flange for a pipe joint is integrally formed, and more specifically, it is improved to a structure capable of minimizing raw materials required for manufacturing while ensuring excellent airtight performance, thereby significantly reducing construction costs. It relates to a lowered flange-integrated corrugated steel pipe.

In general, large-diameter pipes are used for water supply and sewage facilities to supply drinking water and industrial water to each household at a water purification plant or multi-purpose dam, or to supply wastewater generated from homes or industrial facilities to treatment facilities. Synthetic resin pipes or various types of prefabricated connection pipes have been developed and are widely used for such large-diameter pipes, and construction is impossible because only a single pipe is buried when piping is buried in the ground.

Therefore, several large-diameter pipes are arranged in succession, and the ends of the pipes are thickly welded and formed as disclosed in Korean Patent Publication No. 10-0098844 (Name of invention: Flanged double-wall spiral corrugated pipe and its manufacturing method). It is buried by combining one flange with various joint means such as bolts or bands.

Here, the existing corrugated pipe has a structure where the flange covers only the outer surface of the steel pipe, so the integrity and airtightness of the steel pipe and the flange are not perfect, so the flange is easily separated from the steel pipe, so that the fluid flowing inside leaks through the joint between the flanges. There is a problem that it cannot be used for a long period of time and requires frequent repairs or reconstruction.

Therefore, as a way to improve this problem, Korean Patent Publication No. 10-0874460 (name of the invention: a pipe with a flange) has been proposed. According to the proposed literature, the unity and airtightness of the pipe and flange through the outer body protruding by being welded to the outer end of the pipe, the inner measuring joint welded to the inner end, and the through hole perforated at the end of the pipe. To increase the durability of the product and improve the quality.

However, compared to the flange formed only on the outer surface of the pipe, the flange formed and fused at the same time inside and outside the pipe has increased tightness in the connection between the pipes, but the problem that the gap between the flange and the pipe occurs and leakage occurs, requiring repair. I couldn't solve it.

Recently, in order to solve this problem, Korean Patent Publication No. 10-1482205 (name of the invention: flange reinforced pipe) has been proposed. According to the proposed literature, both ends of the pipe are cut in the longitudinal direction and bent outward, and the flanges are welded in a form enclosed inside and outside to increase the integrity and airtightness of the pipe and the flange, and prevent the flange from being separated from the pipe. .

However, due to the structure that covers both the inside and the outside for the airtightness of the flange, there is a problem that the construction cost increases as the raw material of the flange required for manufacturing is relatively significant. Of course, it is possible to consider manufacturing cost by reducing the size of the flange, but there is a limit to securing airtight performance. Therefore, there is a need for a way to minimize raw materials required for manufacturing while ensuring airtight performance.

Republic of Korea Patent Publication No. 10-0098844 (Name of invention: Double-walled spiral corrugated pipe with flange and its manufacturing method) Korean Patent Publication No. 10-0874460 (Name of invention: Flange formed pipe) Korean Patent Publication No. 10-1482205 (Name of invention: flange reinforced pipe)

The present invention was created in order to more actively solve the above problems, and includes a protruding section that seals the joint by engaging the joint surfaces of the flange, and a depressed section that induces reduction of raw materials while increasing the applied joint pressure. The purpose of this is to provide a flange-integrated corrugated steel pipe that can significantly reduce construction costs through overall cost reduction while improving the structure to minimize raw materials required for manufacturing while ensuring airtight performance by organizing compartments. have.

In order to achieve the above problem, the configuration of the flange-integrated corrugated steel pipe proposed in the present invention is as follows.

The above flange-integrated corrugated steel pipe is a corrugated steel pipe in which a flange for a pipe joint is integrally formed: a steel pipe having a set length and a bent piece formed on the end in an outward direction, and welded to the end of the above steel pipe to form integrally with the bent piece. And a connecting member interposed on the upper flange to induce the connection, and the upper flange is composed of a locking jaw that receives pressure from the connecting member on an outer surface, and a joint surface that engages with the joint object on one surface to induce a pipe joint. , The upper joint surface is characterized in that it is divided into an airtight section in which the joint is protruded to be sealed by being engaged with the joint object, and an avoiding section that is depressed to increase the joint pressure acting on the upper airtight section.

At this time, the above airtight section according to the present invention is larger than the share of the total area of the joint surface divided by 50%, and the avoidance section is formed with an area smaller than the share of the total area of the joint surface divided by 50%. It is characterized in that the partition is organized so that the maximum pressure allowed per unit area according to the material is applied.

In addition, the above airtight section according to the present invention is integrally formed with airtight irregularities that increase the airtightness performance by increasing the interlocking area on the outer surface, and the avoidance section is independently organized inside and outside the airtight section, or the airtight section It is characterized in that it is united in the center of.

In addition, the above airtight section according to the present invention is integrally formed with airtight unevenness that doubles the airtightness performance by increasing the area of engagement on the outer surface, and the above avoidance section is integrated with a reinforcing means that increases the maximum allowable pressure applied to the airtight section. It characterized in that it is provided.

In addition, the reinforcing means according to the present invention is characterized in that it is composed of either one of plate-shaped reinforcing ribs or dome-shaped reinforcing protrusions arranged radially on the avoiding section or in a combination.

According to the present invention having the above-described configuration, the joint surface for inducing the pipe joint to the flange is engaged with other flanges, so that the joint protrudes to be sealed, and the joint pressure applied to the airtight region is increased, while the required raw material is reduced. In addition to organizing the division as an avoiding section, the airtight unevenness is integrally formed in the airtight section to increase the biting area to increase the airtight performance, and a reinforcing means in the avoiding section is provided to increase the allowable maximum pressure applied to the airtight section. It provides the effect of remarkably reducing the construction cost through overall cost reduction while ensuring excellent airtight performance.

1 is a perspective view showing the entire corrugated steel pipe according to the present invention.
Figure 2 is a cross-sectional view showing the entire cut-out corrugated steel pipe according to the present invention.
3 and 4 are cross-sectional views showing an enlarged main part of the corrugated steel pipe according to the present invention.
5 and 6 are cross-sectional views showing the joint state of the corrugated steel pipe according to the present invention.
7 to 10 are configuration diagrams showing a corrugated steel pipe according to a modified example of the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration of the present invention, and actions and effects thereof will be described collectively.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms. However, this embodiment allows the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. In addition, the same reference numerals refer to the same elements throughout the entire specification.

The present invention relates to a corrugated steel pipe in which a flange for a pipe joint is integrally formed, and is a flange-integrated corrugated steel pipe having a steel pipe 10, a flange 20, and a connecting member 30 as main configurations as shown in FIGS. 1 and 2.

In the corrugated steel pipe of the present invention, the joint pressure per unit area applied to the protruding section is increased by dividing the joint surface of the flange welded to the unavoidable thickness to meet the set standard into a protruding section that meshes with other flanges and a depressed section to be avoided. The main point is to reduce manufacturing cost by minimizing welding raw materials.

The steel pipe 10 is a pipe having a length and a diameter of a set standard, and a bent piece 11 that is bent outward at both ends as shown in FIGS. 1 and 2 is formed. That is, along the circumference of the steel pipe 10, the bent piece 11 is cut in at least 4 parts or more on the outer surface of the end so that the bent piece 11 has a uniform length. This bent piece 11 is preferably bent at 10 to 75° based on the center line of the steel pipe 10.

Here, the steel pipe 10 is preferably formed with a coating layer 15 having a thickness of 30 to 50 μm to prevent corrosion as shown in FIG. 3. The coating layer 15 is formed of epoxy powder in which a curing agent, a pigment, a filler, a flow control agent, and a bubble remover are metered and mixed with an epoxy resin as a main material.

At this time, the steel pipe 10 is preferably sprayed with high-pressure metal particles to form the coating irregularities 12 of the V-shaped cross section on the surface. These coating irregularities 12 improve the adhesion of the coating layer 15 to prevent peeling.

In addition, the steel pipe 10 may further form a coating layer 16 having a thickness of 100 to 3000 μm on the outer surface of the coating layer 15. This coating layer 16 is formed by extruding molten polyethylene or applying a polyethylene film. That is, the coating layer 16 reinforces the coating layer 15 to prevent damage due to external impact.

On the other hand, the coating layer 16 may be formed of any one of coal tar, polyurethane, polyamine, and isocyanate prepolymer in addition to polyethylene, or a mixture thereof. In addition, the steel pipe 10 is based on a metal material as the name suggests, but may be formed of a resin material in some cases.

The flange 20 is a bag that is integrally welded to the end of the steel pipe 10 to induce a butt joint, and is integrated so that the bent piece 11 is wrapped around the inner and outer surfaces of the steel pipe 10 as shown in FIGS. 1 and 2. Is formed by The flange 20 may be formed of the same material as the coating layer 15 or the coating layer 30 and other resin materials.

Here, the flange 20 is composed of a locking jaw 21 receiving a pressing force from a connection member 30 to be described later on an outer surface, and a joint surface 25 that engages with a joint object facing each other on one surface to induce a pipe joint. That is, the locking protrusion 21 is formed at a height corresponding to the thickness of the connecting member 30 at the rear portion of the bent piece 11, and the joint surface 25 can guarantee airtight performance at the end of the steel pipe 10. It is formed to have a thickness.

The connecting member 30 is an element interposed on the flange 20 as shown in FIGS. 1 and 2 to induce a connection with a joint object, and the connecting ring 31 and a plurality of connecting bolts 32 as shown in FIGS. 5 and 6 And a gasket 35. The connecting ring 31 is constrained to the locking protrusion 21 in one direction, the connecting bolt 32 is inserted through the connecting ring 31 to be fastened to the joint, and the gasket 35 is the outer surface of the connecting surface 25 Adheres to. That is, while the connection bolt 32 is inserted into the fastening hole 31a provided in the connection ring 31, it is fastened to the connection object and applies pressure to the connection surface 25.

Here, the connecting ring 31 is made of a semicircular upper and lower connecting ring that is divided up and down with respect to the center of the steel pipe 10, and is a coupling protrusion that protrudes horizontally outward at the divided portion in contact with each other to induce mutual fastening. Can be provided.

At this time, the coupling protrusions of the upper and lower connection rings may have a coupling hole into which a bolt is inserted, such as a coupling hole 31a, rotates along the hinge to one coupling protrusion of the lower coupling ring, and selectively engages with the other coupling protrusion so that the upper connection ring It can be composed of a toggle clip that wraps around and induces coupling.

On the other hand, the joint surface 25 is an airtight section 25a in which the joint protrudes to be sealed by engaging with the object to be joined as shown in Figs. 1 and 2, and an avoidance section 25b that is depressed to increase the joint pressure acting on the airtight section 25a. It is organized into divisions.

Here, the airtight section 25a is larger than the share of the total area of the joint surface 25 divided by 50%, and the avoidance section 25b is formed with an area smaller than the share of the total area of the joint surface 25 divided by 50%. That is, the airtight section 25a that directly engages with the joint object is partitioned so that the maximum pressure allowed per unit area is applied according to the material of the flange 20 acting on the joint surface 25.

For example, the area of the joint surface 25 is 2515.788cm^2, the maximum allowable pressure according to the material is 200kg/cm^2, and the pressure of the joint surface 25 acting by the connection member 30 is 100kg/cm^2. Assuming, the airtight section 25a is formed to be greater than 1257.894cm^2, and the avoiding section 25b is formed to be less than 1257.894^2, respectively.

Therefore, in the airtight section (25a) that is engaged with the object to be connected by the avoidance section (25b), a maximum pressure approximating 200kg/cm^2 acts according to the formula according to P (pressure) = F (force) / A (area). Thus, while improving the airtight performance, manufacturing cost can be reduced by reducing raw materials according to the avoidance section 25b.

Of course, the joint surface 25 is not divided into an airtight section 25a and an avoiding section 25b, and the entire area is formed with a thickness corresponding to the maximum allowable pressure, or the pressure applied by the connecting member 30 When implemented so that the maximum allowable pressure is applied, the airtightness performance can be improved and the manufacturing cost can be reduced.

However, the joint surface 25 must inevitably be welded to a thickness of at least 42mm due to the thickness of the steel plate according to the set standard, the bent piece 11, and the connection member 30 according to compatibility with the joint object. Here, the thickness means the distance between the outer diameter and the inner diameter of the flange 20.

And when the pressure applied by the connecting member 30 is implemented so that the maximum allowable pressure is applied, it is inevitable to change the size and number of the connecting bolts 32, and unnecessary pressure is applied, resulting in waste of man-hours due to construction. .

Therefore, it is preferable to divide and organize into an airtight section 25a protruding outward with respect to an area according to the minimum thickness applicable to the joint surface 25 and an avoiding section 25b depressed inward.

At this time, the avoidance section (25b) can be independently organized inside and outside the airtight section (25a) as shown in Figs. 4a and 5, and a single unit in the center of the airtight section (25a) as shown in Figs. 4b and 6 I can organize it with. In any case, the effect of improving airtightness and cost reduction is the same.

At this time, the airtight section 25a is preferably formed integrally with the airtight unevenness 26 on the outer surface as shown in FIG. The airtight unevenness 26 is formed in a V-shaped cross-section to increase the joint area and the interlocking area to double the airtight performance.

On the other hand, it is preferable that the avoidance section 25b further comprises a reinforcing means 40 integrally as shown in FIGS. 8 and 9. The reinforcing means 40 serves to increase the maximum allowable pressure applied to the airtight section 25a.

These reinforcing means 40 may be composed of either one of a plate-shaped reinforcing rib 41 arranged radially on the avoidance section 25b as shown in FIG. 10A or a dome-shaped reinforcing protrusion 45 as shown in FIG. have.

That is, as previously assumed, if the allowable maximum pressure at which the airtight section 25a is applied is 200kg/cm^2, 210kg/cm^2 to 250kg/cm^ by the reinforcing means 40 provided in the avoidance section 25b Improve to 2. Therefore, it is possible to ensure improved airtight performance as well as compatibility that can be applied to various joint objects and fluids due to the allowable excess pressure.

Hereinafter, in order to prove the effect of the reinforcing means 40 provided in the flange-integrated corrugated steel pipe according to the present invention, it was analyzed based on the following experiment.

-Experiment method-

On the joint surface 25 of the flange 20, the control group is divided only into the airtight section (25a) and the avoidance section (25b), and the control section is divided into the airtight section (25a) and the avoidance section (25b) of the same area as the control group. The equivalent strain (ESTRN) was analyzed through Solidwoks 2018 Simulation in order to find out the deformation relationship according to the pressure with the experimental group in which the domed reinforcing protrusion 45 was provided in the avoidance section 25b.

-Psalm production-

The areas of the airtight section (25a) and the avoidance section (25b) applied in the experiment are applied equally to 1257.894cm^2, respectively, and the dome-shaped reinforcement protrusion (45) is applied with the same radius as the thickness of the avoidance section (25b). As shown in Table 1 below, the experimental group and the control group were classified and modeled on a solid basis, and then the same physical properties were applied under the conditions shown in Table 2.

Experimental group Control

division Flange (high viscosity polyethylene) Tensile stress 2.21e+07 N/m^2 Modulus of elasticity 1.07e+09 N/m^2 Po Asongbi 0.4101 Mass density 952 kg/m^3 Shear modulus 3.772e+08 N/m^2

-Experimental conditions-

As shown in Table 3 below, the locking protrusion 21 is set to a fixed geometry (green), and an external pressure (red) of 100kgf/cm^2 is added to the airtight section 25a, and then the size of 6.34381mm and 0.31719 mm Tolerance Jacobian points were converted to 4-point mesh and then simulated.

Experimental group Control

-Experiment result-

As shown in Table 4 below, the minimum equivalent strain of the experimental group was 4.057e-08mm, and the minimum equivalent strain of the control group was 4.983e-08mm. That is, it can be seen that the experimental group can increase the allowable pressure relative to the same area through the reinforcing means 40 of the present invention, as the experimental group is analyzed as a result of having a significant deformation rate lower than that of the control group.

division Equivalent strain Equivalent strain




Experimental group




4.057e-08mm

Control




4.983e-08mm

As described above, the present invention is divided into an airtight section in which a joint surface inducing a pipe joint to a flange is engaged with other flanges so that the joint protrudes to be sealed, and an avoiding section that is depressed to reduce raw materials while increasing the joint pressure acting on the airtight section. In addition to being organized, airtight unevenness is integrally formed in the airtight section to increase the sealing area to increase the airtight performance, and a reinforcing means in the avoiding section is provided to increase the maximum allowable pressure applied to the airtight section, thereby providing excellent airtight performance. While guaranteeing, overall cost reduction can significantly reduce construction costs.

10: steel pipe 11: bending piece
12: coating irregularities 15: coating layer
16: coating layer 20: flange
21: locking jaw 25: joint surface
25a: confidential section 25b: avoided section
26: airtight unevenness 30: connecting member
31: connecting ring 31a: fastening hole
32: connection bolt 35: gasket
40: reinforcing means 41: reinforcing rib
45: reinforcement protrusion

Claims (4)

In the corrugated steel pipe in which the flange for pipe joint is integrally formed:
A steel pipe 10 having a set length and having a bent piece 11 formed on the end in an outward direction, and a flange 20 that is welded to the end of the steel pipe 10 and formed integrally with the bent piece 11, It is made of a connecting member 30 interposed on the upper flange 20 to induce connection,
The upper flange 20 is composed of a locking jaw 21 receiving pressure from the connection member 30 on an outer surface, and a joint surface 25 that engages with a joint object to induce a pipe joint on one surface,
The joint surface 25 is divided into an airtight section 25a in which the joint protrudes to be sealed by being engaged with the joint object, and an avoidance section 25b that is depressed to increase the joint pressure acting on the airtight section 25a,
The above airtight section (25a) is larger than the share of the total area of the joint surface (25) divided by 50%, and the avoidance section (25b) is formed in an area smaller than the share of the total area of the joint surface (25) divided by 50%, so that it fits with the joint object. The physical airtight section (25a) is divided so that the maximum pressure allowed per unit area according to the material of the flange (20) is operated,
The above airtight section (25a) is integrally formed with airtight unevenness (26) that doubles the airtightness performance by increasing the area to be bitten on the outer surface. Or organized as a single unit in the center of the airtight section (25a),
The above steel pipe 10 forms a coating layer 15 having a thickness of 30 to 50 μm, and the coating layer 15 is formed of epoxy powder in which a curing agent, a pigment, a filler, a flow control agent, and a bubble remover are metered and mixed in an epoxy resin as a main material Become,
The steel pipe 10 is sprayed with high-pressure metal particles to form a coating irregularity 12 of a V-shaped cross section on the surface, and a coating layer 16 having a thickness of 100 to 3000 μm is further formed on the outer surface of the coating layer 15 , The coating layer 16 is formed by extruding and applying molten polyethylene or attaching a polyethylene film,
The avoidance section 25b further comprises a reinforcing means 40 integrally, and the reinforcing means 40 is a plate-shaped reinforcing rib 41 or a dome-shaped reinforcing protrusion arranged radially on the avoiding section 25b. 45) Flange-integrated corrugated steel pipe, characterized in that consisting of any one or a combination of.


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