CN110645437B - Corrugated pipe type plugging ball applied to slurry shield machine pipeline extension system - Google Patents

Abstract

The invention relates to a corrugated pipe type plugging ball applied to a slurry shield machine pipeline extension system, which comprises a metal corrugated pipe, wherein a layer of polyurethane elastomer material is coated outside the metal corrugated pipe. For the metal corrugated pipe, the wave pitch t, the wave thickness a and the single-layer thickness h of the corrugated pipe are₀Wave height H and connecting head thickness H₁Is calculated based on the inner diameter of the pipe. Mainly solves the technical defects in the prior research of the slurry shield machine pipeline extending and plugging device, and solves the problems of inconvenient operation, heavier mass, small deflection, larger friction force and the like.

Description

Corrugated pipe type plugging ball applied to slurry shield machine pipeline extension system

Technical Field

The invention relates to a corrugated pipe plugging device for plugging muddy water in a muddy water balance shield machine pipeline extension system.

Background

In the process of tunneling of the slurry shield machine, the slurry feeding pipe and the slurry discharging pipe are fixed, and slurry is continuously supplied to the cutter disc and discharged to the ground. However, the lengths of the mud inlet pipe and the mud discharge pipe are limited, and the mud inlet pipe and the mud discharge pipe need to be stopped for pipe connection every several meters. If the connected pipe flanges are disassembled during pipe connection, a large amount of muddy water in the steel pipes must flow into the tunnel, so that the construction environment is damaged, muddy water resources are wasted, and the requirements of civilized environment-friendly construction and resource saving are not met. In addition, the process of repeatedly taking over the shield machine is complex and time-consuming, and serious adverse effects are generated on the efficient propulsion of the whole shield machine. At present, an entity blocking cylinder type blocking ball is already available in the market, for example, in patent CN104390090A, when a pipeline leaks, the blocking ball in the hemispherical tube cavity of the pipe joint is pressed against the small hole channel under the action of water pressure, so as to block the pipeline on one side, thereby preventing water loss in the pipeline. This type of ball has low stiffness, is not easy to handle, is more worn severely, and is limited by the existing materials. For another example, patent CN206936667U discloses a pipeline plugging ball and a pipeline plugging structure. The equator radial expansion of the plugging ball in the pipe can be isolated and controlled by utilizing a magnetic field outside the pipe, so that the plugging ball is just in interference fit with the pipe when the equator is radially expanded, and the plugging effect is achieved. However, the blocking ball of this type has the disadvantages of heavy weight, large frictional resistance, difficulty in passing through the three-way reversing valve due to small deflection, and the like, and the middle of the blocking column body collapses with the increase of the number of uses, so that the blocking effect is deteriorated.

Disclosure of Invention

The invention aims to provide a corrugated pipe plugging ball for plugging muddy water in a muddy water balance shield machine pipeline extension system, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a be applied to balanced shield of muddy water machine pipeline and extend shutoff ball of system includes: the metal corrugated pipe is made of a layer of polyurethane elastomer material.

Mainly based on the calculation of the inner diameter of the pipeline, the specific method is as follows:

the corrugated pipe type plugging ball is applied to a slurry shield machine pipeline extension system, and the wave distance t and the wave thickness a of the metal corrugated pipe are calculated according to the following formula:

t＝0.068D_in；

a＝0.0408D_in；

in the formula: d_inIs the inner diameter of the slurry bypass pipe, mm;

t is the wave pitch of the corrugated pipe, and t is 0.12d and mm;

d is the inner diameter of the metal corrugated pipe,

mm；

d is the outer diameter of the metal corrugated pipe, and D is 0.85D_in，mm；

and a is the wave thickness of the metal corrugated pipe, and a is 0.6t and mm.

Be applied to slurry shield machine pipeline and extend bellows formula shutoff ball of system, metal corrugated pipe's single thickness h₀And the wave height H of the metal bellows is calculated as follows:

in the formula: h is₀The thickness of the single-layer wall of the metal corrugated pipe is mm;

h is the wave height of the metal corrugated pipe, mm;

p is the maximum bearing pressure of the corrugated pipe, MPa;

D_inis the inner diameter of the slurry bypass pipe, mm;

[ sigma ] is the allowable stress of the material, MPa.

Corrugated pipe type plugging ball applied to slurry shield machine pipeline extension system, wherein the thickness h of connecting end socket of metal corrugated pipe₁The wave number n is calculated as follows:

in the formula: h is₁The thickness of the connecting end socket is mm;

L₀is the effective length, L, of the metal bellows₀＝1.275D_in；

a is the wave thickness of the metal corrugated pipe, and a is 0.6 t;

[ sigma ] is allowable stress of material, MPa

Compared with the prior art, the invention has the beneficial effects that:

1. the weight is light, and the deflection is large;

2. the use is convenient and the plugging performance is good;

3. the installation and the disassembly are convenient, the structure is simple, and the realization is easy.

Drawings

FIG. 1 is a schematic view of a normal working state of a mud conveying pipeline;

figure 2 is a schematic diagram of the water pressure applied to the plugging device in the by-pass pipe 3.

Fig. 3 is a structural view of a metal bellows.

Fig. 4 is a structural view of a bellows type blocking ball.

Fig. 5 is a welded joint of a metal bellows and a head.

In the figure: 1. the device comprises a main slurry pipe before a valve, a main slurry pipe after the valve, a bypass pipe, a blocking ball and a three-way reversing valve with the angle of 5-135 degrees, wherein the main slurry pipe is 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: the utility model provides a be applied to mud shield and construct bellows formula shutoff ball of quick-witted pipeline extension system, it includes the metal bellows, and metal bellows coats a layer of polyurethane elastomer material outward. It is characterized in that: for the metal corrugated pipe, the wave distance t and the wave thicknessa, single-layer thickness h of corrugated pipe₀Wave height H and connecting head thickness H₁Is calculated based on the inner diameter of the pipeline;

the wave distance t and the wave thickness a of the metal corrugated pipe are calculated according to the following formula:

t＝0.068D_in；

a＝0.0408D_in。

in the formula: d_inIs the inner diameter of the slurry bypass pipe, mm;

t is the wave pitch of the corrugated pipe, and t is 0.12d and mm;

d is the inner diameter of the metal corrugated pipe,

mm；

d is the outer diameter of the metal corrugated pipe, and D is 0.85D_in，mm；

a is the wave thickness of the metal corrugated pipe, and a is 0.6t, mm;

the single-layer thickness h of the metal corrugated pipe₀And the wave height H of the metal bellows is calculated as follows:

in the formula: h is₀The thickness of the single-layer wall of the metal corrugated pipe is mm;

D_inis the inner diameter of the slurry bypass pipe, mm;

p is the maximum bearing pressure of the corrugated pipe, MPa;

[ sigma ] is the allowable stress of the material, MPa;

h is the wave height of the metal corrugated pipe, mm;

the thickness h of the connecting end socket of the metal corrugated pipe₁Calculated as follows:

in the formula: h is₁The thickness of the connecting end socket is mm;

D_inis the inner diameter of the slurry bypass pipe, mm;

p is the maximum bearing pressure of the corrugated pipe, MPa;

L₀is the effective length, L, of the metal bellows₀＝1.275D_in。

The invention will be further described with reference to the accompanying drawings:

FIG. 1 shows that when a mud pipeline works normally, a three-way reversing valve is rotated after a pipe connecting command is received, and a mud main pipe 1 and a bypass pipe 3 are connected to the front of the valve.

Figure 2 shows the water pressure on the plugging device in the by-pass pipe 3 to push the plugging ball to the proper position of the main mud pipe 1 before the valve to start the pipe connection. After the pipe connection is finished, the plugging ball returns to the initial position in the bypass pipe 3 under the action of the slurry, the three-way reversing valve is rotated, the slurry main pipe 1 in front of the valve and the slurry main pipe 2 behind the valve are communicated, and the muddy water conveying operation is normally carried out.

In order to explain the design content of the metal bellows type plugging ball in detail, the following description is made in detail with reference to the examples and accompanying drawings.

Take a plugging device in a mud conveying pipeline (with the inner diameter of 450mm) as an example.

The method comprises the following steps of firstly, determining the outer diameter and the inner diameter of the metal corrugated pipe and the effective length of the metal corrugated pipe.

Outer diameter: d is 0.85D_in＝0.85×450＝382.5mm；

Inner diameter:

taking the inner diameter as 260 mm;

effective length of metal bellows: l is₀1.2D ═ 1.2 × 382.5 ═ 459mm, L₀＝460mm。

And secondly, determining the wave pitch and the wave thickness of the metal corrugated pipe.

Wave pitch t of the metal corrugated pipe:

t＝0.068D_in＝0.068×450＝31.2mm；

wave thickness a:

a＝0.0408D_in＝0.0408×450＝18.72mm；

the thickness of the wave was taken to be 20 mm.

And thirdly, determining the thickness of the metal corrugated pipe and the wave height of the metal corrugated pipe.

Selecting a metal corrugated pipe material of 06Cr19Ni10, the maximum bearing pressure of 3MPa and the single-layer thickness h of the corrugated pipe₀Comprises the following steps:

upward rounding h₀The number of layers was 5, 0.9mm each, 4.5 mm.

Wave height H of the metal bellows:

and fourthly, determining the thickness of the metal corrugated pipe end socket.

Taking the additional allowance into consideration, the thickness of the seal head is 8mm

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. The utility model provides a be applied to mud shield and construct bellows formula shutoff ball of quick-witted pipeline extension system, it includes the metal bellows, the outer cladding one deck polyurethane elastomer material of metal bellows, its characterized in that: for the metal corrugated pipe, the wave pitch t, the wave thickness a and the single-layer thickness h of the corrugated pipe are₀Wave height H and connecting head thickness H₁Is calculated based on the inner diameter of the pipeline;

the wave distance t and the wave thickness a of the metal corrugated pipe are calculated according to the following formula:

t＝0.068D_in；

a＝0.0408D_in；

in the formula: d_inIs the inner diameter of the slurry bypass pipe, mm;

t is the wave pitch of the corrugated pipe, and t is 0.12d and mm;

d is the inner diameter of the metal corrugated pipe,

mm；

d is the outer diameter of the metal corrugated pipe, and D is 0.85D_in，mm；

a is the wave thickness of the metal corrugated pipe, and a is 0.6t, mm;

the single-layer thickness h of the metal corrugated pipe₀And the wave height H of the metal bellows is calculated as follows:

in the formula: h is₀The thickness of the single-layer wall of the metal corrugated pipe is mm;

D_inis the inner diameter of the slurry bypass pipe, mm;

p is the maximum bearing pressure of the corrugated pipe, MPa;

[ sigma ] is the allowable stress of the material, MPa;

h is the wave height of the metal corrugated pipe, mm;

the thickness h of the connecting end socket of the metal corrugated pipe₁Calculated as follows:

in the formula: h is₁The thickness of the connecting end socket is mm;

D_inis the inner diameter of the slurry bypass pipe, mm;

p is the maximum bearing pressure of the corrugated pipe, MPa;

L₀is the effective length, L, of the metal bellows₀＝1.275D_in。

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