Full-anti-corrosion steel corrugated pipe

Abstract

The utility model belongs to the technical field of pipe machining, and particularly relates to a full anti-corrosion steel corrugated pipe which comprises a pipe body supporting layer, the pipe body supporting layer is formed by spirally winding, seaming and connecting corrugated strips, the pipe body supporting layer is of a corrugated structure, and a lining layer is bonded to the inner wall of the pipe body supporting layer. Gaps exist between the inner lining layer and the wave crests of the pipe body supporting layer, and the inner wall of the inner lining layer is straight and smooth; the full-anti-corrosion steel corrugated pipe is good in anti-corrosion performance, long in service life and low in maintenance cost, the corrugated structure of the outer wall of the pipe and the smooth inner wall of the pipe further enhance the strength and stability of the pipe, medium conveying conditions are optimized, and conveying efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of pipe processing technology, specifically relating to a fully corrosion-resistant steel corrugated pipe. Background Technology

[0002] In many fields such as urban sewer systems and drainage projects, reinforced plastic pipes are increasingly used. Since drainage pipes are pressureless, various forms of reinforcing ribs are typically installed on the outer circumference of the pipe wall to improve their resistance to external pressure and impact. There are two main types of commonly used reinforced plastic pipes: one is made by direct extrusion molding, the most representative being double-wall corrugated pipes; the other is made by spiral winding molding, represented by various structural wall pipes. Spiral wound structural wall pipes have a wide range of applications, with their main advantage being in terms of diameter; pipes with an outlet diameter greater than 1000mm can be produced using small equipment. However, because the raw material used in spiral wound structural wall pipes is mainly polyethylene, and polyethylene itself has a low elastic modulus, the ring stiffness of the produced pipes cannot meet the requirements, thus greatly limiting the application and development space of this type of product. Currently, the main ways to increase the ring stiffness of pipes include adding reinforcing structures such as steel strips and ribs to the outer surface of the spiral pipe or increasing the thickness of the pipe cross-section. However, although reinforcing structures can improve the ring stiffness of pipes, the structure of the product is unstable, and the stress points are too concentrated, making the structure extremely easy to break. Moreover, too much steel strip and rib are bonded to the plastic outer surface, resulting in very low peel force at the joint, which can easily cause engineering accidents. Increasing the thickness of the pipe cross-section will increase the amount of material used in the pipe, increase production costs, and is not conducive to energy conservation, emission reduction, and carbon emission reduction. It is also not conducive to low-cost large-scale industrial production. Utility Model Content

[0003] The purpose of this utility model is to provide a fully corrosion-resistant steel corrugated pipe to solve the problems of easy corrosion, unstable structure and short service life of existing pipelines, so as to achieve full corrosion protection of pipelines, improve stability and extend service life.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A fully corrosion-resistant steel corrugated pipe includes a pipe body support layer, which is made by spiral winding and interlocking of corrugated strip. The pipe body support layer has a corrugated structure. An inner lining layer is bonded to the inner wall of the pipe body support layer. There is a gap between the inner lining layer and the crest of the pipe body support layer. The inner wall of the inner lining layer is flat and smooth.

[0006] Furthermore, the corrugated strip includes a substrate layer, which is made of hot-dip galvanized perforated steel strip or hot-dip galvanized steel strip. Both the inner and outer surfaces of the substrate layer are provided with a polyolefin plastic coating layer. The corrugated strip is formed by rolling with multiple sets of rollers.

[0007] Furthermore, the tube support layer adopts a single flat-joint connection.

[0008] Furthermore, the joint of the tube support layer is sealed by hot melting or resin bonding.

[0009] Furthermore, the inner lining layer is made by bonding plastic strips using a thermal bonding process.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects:

[0011] 1. This utility model relates to a fully anti-corrosion steel corrugated pipe. The entire pipe is formed by spiral winding and interlocking of hot-dip galvanized steel strips coated with polyolefin. This gives the pipe both the high strength of steel and the corrosion resistance of polyolefin. The plastic coating layers at the pipe joint are bonded by hot melt or resin, which not only enhances the sealing performance but also increases the strength at the joint from one layer of steel plate to four layers of steel plate, forming a circular shape evenly distributed along the axis of the pipe, acting as reinforcing ribs. Its compressive strength is significantly improved, being 1.5-3 times that of cement pipes and 3-5 times that of plastic pipes. The spiral winding and interlocking connection technology gives the pipe a certain degree of flexibility along its axis while maintaining strong compressive strength, thus avoiding secondary pollution and ground subsidence caused by misalignment and leakage at the joints of cement / plastic pipes due to foundation settlement.

[0012] 2. The fully corrosion-resistant steel corrugated pipe of this utility model has corrugated protrusions on the outer wall of the pipe, which enhances the overall strength and stability of the pipe. The inner wall of the pipe is straight and smooth, which optimizes the medium transportation conditions. The resistance between the medium and the pipe wall is small, which effectively improves the medium transportation efficiency. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0015] Figure 3 A schematic diagram of the seam of the pipe support layer;

[0016] In the diagram: 1. Pipe support layer; 2. Substrate layer; 3. Polyolefin coating layer; 4. Seam; 5. Liner layer; 6. Void. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] Implementation, for example Figure 1-3As shown, a fully corrosion-resistant steel corrugated pipe includes a pipe support layer 1, which is made of corrugated strip spirally wound and interlocked. The corrugated strip includes a base layer 2, which is made of hot-dip galvanized perforated steel strip or hot-dip galvanized steel strip. Both the inner and outer surfaces of the base layer 2 are provided with a polyolefin plastic coating layer 3. The corrugated strip is rolled by multiple sets of rollers. The pipe support layer 1 has a spiral corrugated structure. The interlocking joint 4 of the pipe support layer 1 is connected by a single flat interlocking joint 4, and the interlocking joint 4 is sealed by hot melting or resin bonding. An inner lining layer 5 is bonded to the inner wall of the pipe support layer 1. The inner lining layer 5 is made of plastic strip bonded by a thermal composite process. There is a gap 6 between the inner lining layer 5 and the corrugations of the pipe support layer 1. The inner wall of the inner lining layer 5 is straight and smooth.

[0019] The fully corrosion-resistant steel corrugated pipe in this embodiment is manufactured using the following process:

[0020] 1. Raw material preparation: Select qualified hot-dip galvanized perforated steel strip or hot-dip galvanized steel strip as the base layer 2, and ensure that the thickness of the steel strip, the thickness of the galvanized layer and other indicators meet the requirements; prepare polyolefin coating material to ensure its stable performance and meet the requirements of the coating process.

[0021] 2. Polyolefin Coating Process: Place the substrate layer 2 into the polyolefin coating equipment and perform coating processing according to the set process parameters. Control the temperature, pressure and coating time to ensure that the polyolefin is evenly covered on the steel strip, forming a firm polyolefin coating layer 3, and obtaining the coated strip. Before coating, it is necessary to ensure that the selected plastic has good adhesion and chemical stability with the substrate according to the compatibility principle of plastic materials, and avoid harmful cross-sectional reactions or delamination.

[0022] 3. Corrugated strip production: The plastic-coated strip is fed into a rolling equipment consisting of multiple sets of rollers. The spacing, depth and pressure of the rollers are adjusted so that the plastic-coated strip forms a corrugated shape precisely according to the preset parameters during the rolling process, thus producing a corrugated strip.

[0023] 4. Tube Forming and Inner Liner 5 Fabrication: The corrugated strip is spirally wound into a forming device according to the set winding speed and seam 4 connection parameters to begin fabricating the tube support layer 1. Simultaneously, the plastic strip is bonded to the inner wall of the tube using a thermal bonding device to form the inner lining layer 5. The plastic strip can be made of a suitable plastic material according to different working conditions. During the fabrication process, the process parameters are monitored in real time to ensure the quality of the tube and the inner lining.

[0024] 5. Treatment of the seam: For the polyolefin coating layer 3 of the seam 4, choose either hot melt or resin bonding method according to the actual situation; for hot melt method, the heating temperature and time need to be controlled to ensure that the polyolefin coating layer 3 of the seam 4 is fully fused; for resin bonding method, a suitable resin adhesive needs to be selected to ensure strong adhesion and good sealing.

[0025] This utility model of a fully anti-corrosion steel corrugated pipe has advantages such as high strength, corrosion resistance, low water flow resistance, environmental protection and energy saving, large flow capacity, long service life, light weight, and convenient and quick handling and installation. In addition, the pipe connection adopts pipe clamps or flange connections, which are both firm and safe. Backfilling can be carried out simultaneously with installation, which saves manpower and speeds up the construction progress, thereby saving construction costs and effectively reducing the overall cost. Based on the corrosion resistance of polyolefins, the service life of the fully anti-corrosion steel corrugated pipe is 50-100 years. It can replace pipes made of high-energy-consuming materials (cement, cast iron, ceramics) and is a low-carbon and environmentally friendly replacement product for drainage pipes.

[0026] Fully anti-corrosion steel corrugated pipes have very low requirements for geographical conditions during construction. After the foundation trench is dug, it can be installed after compaction and a 25-30 cm thick layer of fine sand. Moreover, it is not limited by season, climate, or temperature and can be constructed all year round. Other pipe materials, on the other hand, have high requirements for the foundation before laying, such as compaction, laying concrete to solidify the ground, curing, and encapsulation. They are also more restricted by climate and cannot be constructed in winter.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A fully corrosion-resistant steel corrugated pipe, characterized in that: It includes a pipe support layer (1), which is made by spiral winding of corrugated strip (4) and is corrugated. The pipe support layer (1) has a corrugated structure. An inner lining layer (5) is bonded to the inner wall of the pipe support layer (1). There is a gap (6) between the inner lining layer (5) and the crest of the pipe support layer (1). The inner wall of the inner lining layer (5) is flat and smooth.

2. The fully corrosion-resistant steel corrugated pipe according to claim 1, characterized in that: The corrugated strip includes a substrate layer (2), which is made of hot-dip galvanized perforated steel strip or hot-dip galvanized steel strip. Both the inner and outer surfaces of the substrate layer (2) are provided with a polyolefin plastic coating layer (3). The corrugated strip is rolled by multiple sets of rollers.

3. The fully corrosion-resistant steel corrugated pipe according to claim 1 or 2, characterized in that: The tube support layer (1) is connected by a single flat joint (4).

4. The fully corrosion-resistant steel corrugated pipe according to claim 3, characterized in that: The seam (4) of the tube support layer (1) is sealed by hot melting or resin bonding.

5. The fully corrosion-resistant steel corrugated pipe according to claim 4, characterized in that: The inner lining layer (5) is made by bonding plastic strips using a thermal composite process.

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