Hybrid abrasion resistant clay pipe

Abstract

The utility model relates to a mud suction and discharge technology field of dredger, especially a mixed type wear -resisting mud pipe. Including one bend and the flange fixedly installed in the length both sides of bend, the flange with the bend through the circular ring inner groove and circular ring outer groove butt joint and weld, in this patent, when the easy wear structure such as elbow, tee, cross is connected with the straight pipe, adopt the integral casting of inner lining pipe, and the outer tube is half welded with flange, finally grouting assembly, thereby further optimize the anti cutting and grinding ability of mud suction and discharge pipeline key position, improve the service life of easy wear structure such as elbow, tee, cross, the service life of wear -resisting area is prolonged 2-3 times as a whole, and the rupture risk of mud suction and discharge pipeline key position due to slurry impact is reduced, make the whole dredging system whole period maintenance cost get remarkable reduction.

Description

Technical Field

[0001] This utility model relates to the field of sludge suction and discharge technology for dredging vessels, and in particular to a hybrid wear-resistant sludge pipe. Background Technology

[0002] Guangzhou Airlines 30000m 3 The wear-resistant pipe fittings on the entire vessel of a trailing suction hopper dredger are mainly used in the suction and discharge pipe systems of the dredging system to transport working media such as mud and gravel. Existing wear-resistant mud pipes are generally rolled steel pipes, with structures such as... Figure 1 As shown, Figure 1 The markings indicate that 1 is the outer wall of the rolled steel pipe with a thickness of 14mm, 2 is the weld overlay with a thickness of 12mm, the weld overlay adopts continuous annular oscillating arc welding, single layer is formed in one go, and the total thickness after welding is 26mm, and 3 is the flange.

[0003] The allowable deviation of the surface flatness of the conventional weld overlay structure should not exceed 3mm / m, and the surface should be free of pores, slag inclusions and weld beads after the weld overlay is completed.

[0004] However, in actual operation, when using the aforementioned polyurethane steel pipes to connect with easily worn structures such as elbows, tees, and crosses, the following defects often occur due to welding process issues: 1. Uneven hardness of the weld overlay layer leads to substandard corrosion resistance of the wear-resistant layer and premature detachment in some areas; 2. Residual stress and deformation of the weld overlay lead to localized deformation corrosion cracks in the pipeline; 3. Excessive welding current and slow welding speed cause the base material to melt excessively into the weld overlay, resulting in dilution of the weld overlay composition and a decrease in performance; 4. The interpass temperature of the weld overlay was not strictly controlled. Too high a temperature resulted in coarse grains, while too low a temperature increased the risk of cold cracking.

[0005] Ultimately, this will reduce the service life of easily worn structures such as elbows, tees, and crosses, increase the risk of rupture in key parts of the sludge suction and discharge pipelines due to sludge impact, and result in higher maintenance costs for the entire dredging system throughout its lifecycle. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a hybrid wear-resistant mud pipe that can improve the service life of easily worn structures, as well as the conveying years and service life of the mud suction and discharge pipeline of a trailing suction dredger.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a hybrid wear-resistant mud pipe, the innovation of which is: including a bent pipe and flanges fixedly installed on both sides of the length of the bent pipe; The bend includes an outer pipe and an inner liner pipe, and a cement layer is filled between the outer pipe and the inner liner pipe. A section of the outer tube is cut off from the outer periphery on both sides of the length of the bend to form an annular outer groove, so that the side of the bend forms a first stepped structure. The first stepped structure includes a first upper horizontal section, a first vertical section and a first lower horizontal section connected in sequence, and the first upper horizontal section is the outer wall of the outer tube. An annular inner groove is provided on the inner hole of the flange, so that the inner side of the flange forms a second stepped structure. The second stepped structure includes a second upper horizontal section, a second vertical section and a second lower horizontal section connected in sequence. The second lower horizontal section is the inner hole of the flange. The second lower horizontal section has the same length as the first lower horizontal section and the first vertical section has the same length as the second vertical section. The flange and the bend are connected through the inner and outer annular grooves, so that the second lower horizontal section is in close contact with the first lower horizontal section, the first vertical section is in close contact with the second vertical section, and the first upper horizontal section is in close contact with the second upper horizontal section. Welds are provided between the first and second vertical sections and at the corners where the flange and the outer pipe of the bend meet.

[0008] Furthermore, if the length of the first upper horizontal section is A1 and the thickness of the flange is A2, then A1 = (2 / 5~3 / 5) * A2.

[0009] Furthermore, the length of the first vertical segment is equal to the thickness of the outer tube.

[0010] Furthermore, the thickness of the cement filling layer is greater than the thickness of the outer tube.

[0011] Furthermore, the outer tube has a thickness of 12-20 mm, the cement filling layer has a thickness of 15-20 mm, and the inner liner has a thickness of 35-45 mm.

[0012] The advantages of this utility model are: 1. In this patent, when connecting elbows, tees, crosses, and other easily worn structures to straight pipes, an integrally cast inner lining pipe is used, while the outer pipe with flanges is welded in half. Finally, grouting is applied for assembly. This further optimizes the anti-cutting wear capability of key parts of the dredging pipeline, improves the service life of easily worn structures such as elbows, tees, and crosses, extends the overall lifespan of wear-resistant areas by 2-3 times, and reduces the risk of rupture caused by sludge impact in key parts of the dredging pipeline, significantly reducing the overall life-cycle maintenance cost of the dredging system. The half-welding of the outer pipe with flanges involves: the flange is butt-fitted onto the annular outer groove of the outer pipe via an annular inner groove; then, welds are formed between the first and second vertical sections, and at the angle between the flange and the outer pipe of the bend, thus achieving welded fixation between the flange and the outer pipe.

[0013] 2. The inner lining effectively prevents leakage of the internal medium and serves as the direct contact body for fluid transportation; the cement layer enhances the overall structural strength of the pipeline, enabling the double-layer mud pipe to withstand higher pressure and gravity. The cement material also possesses excellent corrosion resistance, extending the service life of the mud transport pipeline; the outer pipe, with its 12-20mm thick wall thickness for mechanical protection, effectively resists external pressure and impact; the flanges, through the sealing of the inner and outer annular grooves, allow for connection between straight pipes, bends, tees, and crosses in the mud pipe, facilitating subsequent pipe disassembly and maintenance. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the wear-resistant mud pipe produced by the existing weld overlay pipe process.

[0015] Figure 2 This is a partial structural cross-sectional view of the present invention.

[0016] Figure 3 This is a partial structural cross-sectional view of the flange of this utility model. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] This project is for Guangzhou Airlines 30,000m 3 When using a trailing suction hopper dredger to dredge suction and discharge pipelines, and connecting them to straight pipes, existing technologies and connection structures are employed, such as... Figure 1 As shown, when connecting elbows, tees, crosses and other easily worn structures with straight pipes, a hybrid wear-resistant mud pipe is used.

[0019] As the first time in the field of trailing suction hopper dredger dredging systems that two wear-resistant pipe technologies have been combined, the Guanghang 30000m... 3 The wear-resistant technology for dredging suction and discharge pipelines of hopper-type dredgers can be further effectively promoted.

[0020] like Figures 2-3 The illustration shows a hybrid wear-resistant mud pipe, which is used in a system comprising a bend and flanges 4 fixedly installed on both sides of the length of the bend.

[0021] The bend includes an outer pipe 5 and an inner liner pipe 6, and a cement layer 7 is filled between the outer pipe 5 and the inner liner pipe 6.

[0022] The thickness of the inner liner 6 is 35~45mm. The inner liner 6 can effectively prevent leakage of the internal medium and serve as the direct contact body for fluid transportation.

[0023] The cement layer 7 is filled with cement, and the thickness of the cement layer 7 is 15~20mm. The thickness of the cement layer 7 is greater than that of the outer pipe 5, which enhances the overall structural strength of the pipeline and enables the double-pipe mud pipe to withstand higher pressure and gravity. At the same time, the cement material also has good corrosion resistance, which extends the service life of the mud conveying pipeline.

[0024] The outer tube has a wall thickness of 5, 12~20mm for mechanical protection, which can effectively resist external pressure and impact.

[0025] Flange 4, with a thickness of A2, forms an O-ring seal through the sealing connection of the inner and outer annular grooves, allowing connection between straight pipes, bends, tees, and crosses, and facilitating subsequent pipe disassembly and maintenance.

[0026] In this embodiment, the outer pipe 5 has a wall thickness of 16mm, the inner lining pipe has a wall thickness of 16mm, the cement layer 7 has a thickness of 15mm, and the flange 4 has a thickness of 50mm.

[0027] A 30mm long section of outer tube 5 is cut off from the outer periphery of both sides of the bend to form an annular outer groove, so that the side of the bend forms a first stepped structure. The first stepped structure includes a first upper horizontal section, a first vertical section and a first lower horizontal section connected in sequence. The first upper horizontal section is the outer wall of the outer tube 5. The length of the first upper horizontal section is A1, then A1 = (2 / 5~3 / 5) * A2. In this embodiment, A1 is 20mm, then the length of the first lower horizontal section is 30mm, and the length of the first vertical section is equal to the thickness of the outer tube 5.

[0028] An annular inner groove is provided on the inner hole of the flange 4, so that the inner side of the flange 4 forms a second stepped structure. The second stepped structure includes a second upper horizontal section 41, a second vertical section 42 and a second lower horizontal section 43 connected in sequence. The second lower horizontal section 43 is the inner hole of the flange 4. The second lower horizontal section 43 has the same length as the first lower horizontal section, and the first vertical section has the same length as the second vertical section 42. The length of the second upper horizontal section 41 is 20mm, and the height of the second vertical section 42 is 15mm.

[0029] Flange 4 and the bend are connected by an inner and outer annular grooves, so that the second lower horizontal section 43 is tightly fitted with the first lower horizontal section, the first vertical section is tightly fitted with the second vertical section 42, and the first upper horizontal section is tightly fitted with the second upper horizontal section 41. Welds are provided between the first vertical section and the second vertical section 42, and at the corner where flange 4 and the outer pipe of the bend 5 are connected.

[0030] The working principle of this patent: In this patent, when connecting elbows, tees, crosses, and other easily worn structures to straight pipes, the inner lining pipe 6 is integrally cast, and the outer pipe 5 with flange 4 is welded in half. Finally, grouting is used for assembly. This further optimizes the anti-cutting wear capability of key parts of the dredging pipeline, improves the service life of easily worn structures such as elbows, tees, and crosses, extends the overall service life of wear-resistant areas by 2-3 times, and reduces the risk of rupture caused by sludge impact in key parts of the dredging pipeline, thus significantly reducing the overall life-cycle maintenance cost of the dredging system. The welding of the outer pipe 5 with flange 4 in half is as follows: the flange 4 is butted onto the annular outer groove of the outer pipe 5 through an annular inner groove, and then welds are formed between the first vertical section and the second vertical section 42, as well as at the corner where the flange 4 connects to the outer pipe 5 of the bend, to achieve welding fixation between the flange 4 and the outer pipe 5.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hybrid wear-resistant mud pipe, characterized in that: It includes a bend and flanges fixedly installed on both sides of the length of the bend; The bend includes an outer pipe and an inner liner pipe, and a cement layer is filled between the outer pipe and the inner liner pipe. A section of the outer tube is cut off from the outer periphery on both sides of the length of the bend to form an annular outer groove, so that the side of the bend forms a first stepped structure. The first stepped structure includes a first upper horizontal section, a first vertical section and a first lower horizontal section connected in sequence, and the first upper horizontal section is the outer wall of the outer tube. An annular inner groove is provided on the inner hole of the flange, so that the inner side of the flange forms a second stepped structure. The second stepped structure includes a second upper horizontal section, a second vertical section and a second lower horizontal section connected in sequence. The second lower horizontal section is the inner hole of the flange. The second lower horizontal section has the same length as the first lower horizontal section and the first vertical section has the same length as the second vertical section. The flange and the bend are connected through the inner and outer annular grooves, so that the second lower horizontal section is in close contact with the first lower horizontal section, the first vertical section is in close contact with the second vertical section, and the first upper horizontal section is in close contact with the second upper horizontal section. Welds are provided between the first and second vertical sections and at the corners where the flange and the outer pipe of the bend meet.

2. The hybrid wear-resistant mud pipe according to claim 1, characterized in that: The length of the first upper horizontal section is A1, and the thickness of the flange is A2. Then A1 = (2 / 5~3 / 5) * A2.

3. The hybrid wear-resistant mud pipe according to claim 1, characterized in that: The length of the first vertical segment is equal to the thickness of the outer tube.

4. The hybrid wear-resistant mud pipe according to claim 1, characterized in that: The thickness of the cement filling layer is greater than the thickness of the outer pipe.

5. A hybrid wear-resistant mud pipe according to claim 4, characterized in that: The outer tube has a thickness of 12-20 mm, the cement filling layer has a thickness of 15-20 mm, and the inner lining tube has a thickness of 35-45 mm.

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