CN205605998U - Lining pipe prefab of double -deck machinery pipe of array type predeformation - Google Patents

Abstract

The utility model discloses a lining pipe prefab of double -deck machinery pipe of array type predeformation, this processing method includes following step: the step 1, according to the shape and the size of outer tube, preparation and outer tube assorted lining pipe prefab, a plurality of deforming location are in advance calculated to the step 2 on the surface of prefab, the step 3, insert the outer tube with the prefab among, interior pressure is applyed in that the lining is intraductal to the step 4 for prefab and outer tube become one, and the prefab produces minor plastic deformation deforming location in advance peripheral. The strengthening rib sets up in the surface of lining prefab according to certain regular spread. The utility model discloses a critical defective of lining pipe prefab of double -deck machinery pipe of array type predeformation through setting up a plurality of periodicity, regularity artificially and arranging has changed the contact structure of lining pipe and outer tube to avoid the irregular defect that the backing layer produced at random.

Description

The lining pipe prefabricated component of array type predeformation bilayer mechanical tube

Technical field

This utility model relates to double-skin duct, more particularly, it relates to the lining pipe prefabricated component of a kind of array type predeformation bilayer mechanical tube.

Background technology

The anti-corrosion pipeline used in petroleum industry, outer tube and lining pipe are all metal materials.This is a kind of bimetallic lining pipe, and English is MECHANICALLY LINED PIPE, is abbreviated as MLP, and this patent translates into mechanical tube.This mechanical tube is to overlap a thin anti-corrosion alloy backing layer in the inside of carrier pipe, thus is combined into bimetal tube.There is a technical bottleneck in the clad lining of traditional mechanical pipe, it is simply that when mechanical tube bears bending load, metal liner layer easily comes off from outer tube unstability.

Due to the bi-material layer machinery joint product required for a variety of causes (than anticorrosion described above), wherein relatively thin one layer in the inside is backing layer.Outer layer and nexine are compound next one-body molded by machinery.Machinery is compound is the combination of (such as passing through pressure) on a kind of physical layer, does not has interatomic combination in metallographic aspect.This bi-material layer machinery joint product is applicable to various structure, the structure of any shape such as including casing, cylinder or spheroid.

The ectonexine of bi-material layer machinery joint product needs to use different materials, thus ectonexine each plays respective effect, and such as in anti-corrosion pipeline, outer tube is the effect that high-strength steel plays carrying, and inner liner layer is that alloy plays antiseptical effect.The ectonexine of bi-material layer machinery joint product generally uses the material that price is different.Ratio anti-corrosion pipeline as previously mentioned, outer tube material is the common high-strength steel that price is relatively cheap, and nexine metal liner layer is expensive alloy-layer.Use relatively thin metal liner layer by design, thus play cost-effective purpose.

Up to the present, backing layer is pipe purely, uses and the living shape of outer tube, and its starting point is to make two pipes of bi-material layer pipe try one's best to become a pipe, if deformed, common eigenvector.

In order to reach this purpose, when manufacturing bi-material layer machinery joint product, current technique typically requires and polishes smooth in advance at inner and outer pipes faying face in advance, it is ensured that do not stay any gap between inner and outer pipes, so that inner and outer pipes becomes an entirety.

But this purely pipe lining is actually extremely difficult to not stay the requirement in any gap.No matter machining accuracy is the highest, and interior exterior materials layer is actually impossible to be processed into cylinder purely, i.e. there is " geometrical defect " between inner and outer pipes, and defect tends to occur at different places.This small difference, cause the backing layer of tradition bi-material layer machinery joint product by bending time, pipeline in such as petroleum industry is when reel is installed, and backing layer (lining pipe) departs from from outer tube unstability, and the place that comes off is the position at " defect " place.

There is serious defective workmanship in this traditional mechanical Manifold technology because fineness be it is difficult to ensure that, it is possible to the most in theory.As long as having tiny flaw at outer surface or outer pipe internal surface, mechanical tube understands unstability unavoidably.

In the face of unstability comes off problem, popular solution is to increase the thickness of backing layer, is needed by counter-bending unstability by purely pipe backing layer and is continuously increased wall thickness.But this is intended that in order to cost-effective starting point is runed counter to bi-material layer machinery joint product.

Utility model content

The problem easily fallen off for " defect " place of bimetallic tube present in prior art, the purpose of this utility model is to provide the lining pipe prefabricated component of a kind of array type predeformation bilayer mechanical tube.

For achieving the above object, this utility model adopts the following technical scheme that

The lining pipe prefabricated component of a kind of array type predeformation bilayer mechanical tube, including lining pipe body, is provided with reinforcement, and forms axial or circumferential array arrangement in the predeformation position of the outer surface of lining pipe body.

The material of described reinforcement is high-strength steel, and its intensity is more than or equal to the material of outer tube.

Described reinforcement is the Discrete Distribution of rule, and it is shaped as " ten " font, " one " font or " | " font.

It is connected with each other between adjacent reinforcement, the continuous distribution of formation rule arrangement.

In technique scheme, the lining pipe prefabricated component of array type predeformation bilayer mechanical tube of the present utility model is by arranging multiple periodicity, the critical defective of systematicness arrangement artificially, change the contact structures of lining pipe and outer tube, thus avoid the irregular defect that backing layer randomly generates.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing backing layer；

Fig. 2 is the structural representation of this utility model backing layer；

Fig. 3 is predeformation axial array schematic diagram；

Fig. 4 is predeformation circumferential array schematic diagram；

Fig. 5 is the flow chart of the processing method of this utility model array type predeformation bilayer mechanical tube；

Fig. 6 A～6C is the schematic diagram of reinforcement.

Detailed description of the invention

The technical solution of the utility model is further illustrated below in conjunction with the accompanying drawings with embodiment.

The bimetallic tube the utility model discloses a kind of particular type of novel backing layer, applying this backing layer and the manufacture method (processing method and the reinforcement of cooperation thereof) of this bimetallic tube.Core of the present utility model is backing layer, its Chinese name full name is array type predeformation backing layer, English name full name is Grid-Lined Pre-Dimpled Liner, it is abbreviated as GPL, the backing layer of this array type that has been a kind of pre-add deformation, has such as been pre-machined the non-purely column type backing layer of the minute asperities deformation simultaneously arranged according to certain rules at axial and circumferential.

As depicted in figs. 1 and 2, being the schematic diagram with one section of pipe lining of grid representation, outer tube does not draw, and wherein Fig. 1 is pipe purely, and Fig. 2 is artificially at purely pipe surface lining after processing thus define prestrain especially.

The theoretical basis of formation predeformation lining is critical defective.

In theory, purely pipe lining can bear infinitely-great bending load and keep pipe state constant.But purely pipe is impossible, because processing technique whatever, can leave geometrical defect the most unavoidably.The size of geometrical defect determines the bearing capacity of lining.When actual geometrical defect is less than critical defective, lining has the bending resistance of infinite height；And when geometrical defect is more than critical defective, bending resistance is gradually lost in the increase along with bending load by lining.

The definition of formation predeformation backing layer is: be applied with the backing layer of critical defective.

The purpose of the applied predeformation of predeformation lining is to avoid the irregular defect randomly generated of backing layer by applying critical defective artificially.Critical defective is a kind of optimization selection of a lining pipe, and its bending resistance is maximum.

Therefore, as in figure 2 it is shown, array type predeformation bilayer mechanical tube of the present utility model, including outer tube 1 and lining pipe 2.The outer wall of lining pipe 2 is close between the inwall of outer tube 1, and the inwall of the outer wall of lining pipe 2 and outer tube 1 have the plastic deformation do not fitted in many places.Plastic deformation is arranged at the surface of lining pipe 2, and towards the center concave downward of lining pipe 2, the position of plastic deformation is critical defective 3 position of lining pipe 2, and critical defective 3 is the artificial defect periodically arranged.

Further, as in figure 2 it is shown, the position of plastic deformation is regularly arranged array configuration, and at each plastic deformation, all can be provided with reinforcement 4.Additionally, outer tube 1 and lining pipe 2 are metal material, the intensity of outer tube 1 is more than the intensity of lining pipe 2.

Specifically, critical defective 3 is distributed in liner surface, and its defect size changes with axial and circumferential, it may be assumed that

W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ) (1)

In formula (1):

W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate

f_oxX () is axial function

f_{o θ}(θ) it is circumference function

W_ocrFor critical defective value

Axial and circumferential function depends on the operating mode of concrete lining, and a kind of approximate calculation method is that axial function is reduced to:

$f_{ox}\left(x\right)={\left(cos\right(\frac{m_o\·\mathrm{\π}\·x}{L}\left)\right)}^a---\left(2\right)$

In formula (2), L is duct length, m_oBeing axial half-sine wave number, a is index.

Circumference function can be reduced to simultaneously:

$f_{o\mathrm{\θ}}\left(\mathrm{\θ}\right)={\left(cos\right(\frac{n_o\·\mathrm{\θ}}{2}\left)\right)}^b---\left(3\right)$

In formula (3), n_oBeing circumference half-sine wave number, b is index.

Once axial and circumferential function determines, critical defective value just can be tried to achieve according to energy method, and as a=b=2, critical defective value can be expressed as:

$w_{ocr}=\frac{k_1\·R_L\·L^2}{k_2\·{m_o}^2\·{R_L}^2+k_3\·{n_o}^2\·L^2}---\left(4\right)$

In formula (4), k1, k2 and k3 are the constant determined by operating mode, R_LFor lining radius, L is duct length.

The method of above-mentioned calculating critical defective can also expand to following algorithm:

The number of array type predeformation, generally uses m₀, n₀Express.

Such as m in Fig. 3₀N in=8, Fig. 4₀=16.Concrete m₀And n₀Size depend on the parameter such as material, diameter and wall thickness of inner and outer pipes 1 and 2, and need certainly to be determined by analytical calculation according to actual condition.

Predeformation in theory can with the sine wave launched such asWithExpress.

Each predeformation is the most tiny, is a kind of nick in lining pipe 2 radial direction convex (can liken into common dimple or ripples in schedule life), thus does not affect the mechanical function of pipeline.Size W of predeformation_ocrExpress:

$w_{ocr}=-\frac{{\mathrm{\μ}}_3}{{\mathrm{\μ}}_2}---\left(5\right)$

In formula (5): μ₂And μ₃Respectively:

${\mathrm{\μ}}_2=({\mathrm{\μ}}_1\·\frac{t_L}{R_L}-{\mathrm{\α}}_{L2})\·C_w---\left(6\right)$

${\mathrm{\μ}}_3=({\mathrm{\α}}_{L2}-{\mathrm{\μ}}_1\·\frac{t_L}{R_L})\·C_{wow\_a}+({\mathrm{\α}}_{L1}-v\·{\mathrm{\μ}}_1\·\frac{t_L}{R_L})\·C_{wow\_b}---\left(7\right)$

In formula (6):

${\mathrm{\μ}}_1=\frac{{\mathrm{\α}}_{L2}+{\mathrm{\α}}_{P2}\·{\mathrm{\μ}}_{P1}}{ln\left(R_{Po}\right)-ln\left(R_{Li}\right)}---\left(8\right)$

α_L2=α_{L θ}+να_Lx (9)

α_P2=α_{P θ}+να_Px (10)

${\mathrm{\μ}}_{P1}=\left(\frac{{\mathrm{\β}}^{\frac{t_P}{R_r-R_{Lo}}}-1}{ln\left(\mathrm{\β}\right)}\right)\left(\frac{R_r-R_{Lo}}{t_L}\right)---\left(11\right)$

$C_w=\frac{\mathrm{\π}\·L\·t_L}{2}---\left(12\right)$

$C_{wo\mathrm{\δ}w\_a}=\frac{3\·L}{8}---\left(13\right)$

C_{wo δ w_b}=π (14)

T in formula (6) to formula (14)_L、t_PIt is lining pipe 2 and the wall thickness of outer tube 1, R respectively_Li、R_LoAnd R_LIt is the inside radius of lining pipe 2, outer radius and center line radius, R respectively_POIt is the external diameter of outer tube 1, R_rValue 1000R can be distinguished with β_LWith 0.001, α_Lx、α_{L θ}、α_PXAnd α_{P θ}Being lining pipe 2 and outer tube 1 thermal coefficient of expansion at axial and circumferential respectively, ν is Poisson's ratio.

As a example by one section of 0.3m length submarine pipeline, bearing High Temperature High Pressure, its parameter is given in table one and table two:

Table one: pipe parameter

Table two: thermal coefficient of expansion

Predeformation under this operating mode presses aligned transfer at circumferential and axial, as shown in Table 3:

Table three: predeformation array arrangement

mo	no	wocr(mm)
			7	25	0.1

For this utility model outer tube 1 and the two-layer pipe of lining pipe 2, it has two kinds of different modes in processing technology.The first makes outer tube 1 and lining pipe 2 respectively, and another method is to use array type predeformation lining processing method, as it is shown in figure 5, mainly comprise the steps that

S1: according to the shape and size of outer tube 1, make lining pipe 2 prefabricated component matched with outer tube 1.

S2: calculate multiple predeformation position on the outer surface of prefabricated component, predeformation position is critical defective 3 position of prefabricated component, and critical defective 3 is the artificial defect periodically arranged.

S3: inserted by prefabricated component among outer tube 1, can be divided into following 2 sub-steps specifically:

S3.1: reinforcement 4 is set in the predeformation position calculated.

S3.2: the prefabricated component with reinforcement 4 is inserted among outer tube 1.

S4: apply internal pressure in lining pipe so that prefabricated component is integrally forming with outer tube 1, and the prefabricated component periphery in predeformation position produces small plastic deformation.

In above-mentioned steps, calculate the method for critical defective 3 as it was previously stated, repeat no more here.

In addition, reinforcement 4 all can be used in the structure and machining method of bimetallic tube, as shown in figs 6 a-6 c, reinforcement 4 is regular shape parts, by the most regularly arranged outer surface being arranged at lining pipe body, such as, form axial or circumferential array arrangement, to form lining pipe prefabricated component, by said method, i.e. add intrinsic pressure and outer tube formation integrated two-layer pipe.The material of reinforcement 4 is high-strength steel, and its intensity is more than or equal to the material of outer tube 1, and it is shaped as cube thin slice or spherical particles.

Reinforcement 4 can have variform, both can be the parts being distributed by certain regular discrete, it is also possible to is the parts of continuous regular distribution.

Reinforcement 4 shown in Fig. 6 A and 6B be regular discrete distribution, the reinforcement 4 shown in Fig. 6 A is cube, and the reinforcement 4 shown in Fig. 6 B is " ten " font, it is also possible to be " one " font or " | " font.Reinforcement 4 shown in Fig. 6 C is continuous distribution, is equivalent to the criss-cross each edge of Fig. 6 B to extend respectively, and is interconnected to form network-like reinforcement 4 between adjacent reinforcement 4, thus realizes the regularly arranged of continuous distribution.

In sum, when the outer surface of mechanical tube or the defect of outer pipe internal surface are less than critical defective, mechanical tube unstability the most never comes off.Mechanical pipe critical defective is the least, in the range of hundreds of silk.Theoretical according to critical defective of the present utility model, traditional mechanical pipe cannot control the accuracy of manufacture in the manufacturing cost allowed in technique at all and meet the requirement of critical defective.

Therefore, technique is improved with it to guarantee that the fineness on surface, to prevent backing layer unstability from coming off, is not so good as to introduce defect by critical defective so that inner liner can small unstability come off everywhere, thus prevents local buckling from coming off.

The thickness of inner lining that traditional mechanical pipe needs increases thickness along with requiring to improve to bending, and the liner thickness of bimetallic tube of the present utility model even has only to 1mm thickness, or uses the minimum thickness required for processing technique.

Those of ordinary skill in the art will be appreciated that, above embodiment is intended merely to this utility model is described, and it is not used as to restriction of the present utility model, as long as in spirit of the present utility model, change, the modification of embodiment described above all will be fallen in Claims scope of the present utility model.

Claims (4)

1. a lining pipe prefabricated component for array type predeformation bilayer mechanical tube, including lining pipe body, it is characterised in that: it is provided with reinforcement in the predeformation position of the outer surface of lining pipe body, and forms axial or circumferential array arrangement.

2. the lining pipe prefabricated component of array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that the material of described reinforcement is high-strength steel, and its intensity is more than or equal to the material of outer tube.

3. the lining pipe prefabricated component of array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that described reinforcement is the Discrete Distribution of rule, and it is shaped as " ten " font, " one " font or " | " font.

4. the lining pipe prefabricated component of array type predeformation bilayer mechanical tube as claimed in claim 3, it is characterised in that be connected with each other between adjacent reinforcement, the continuous distribution of formation rule arrangement.