CN2180864Y

CN2180864Y - Directly-buried disposable bellows expand joint

Info

Publication number: CN2180864Y
Application number: CN 93246641
Authority: CN
Inventors: 苏文玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-30
Filing date: 1993-12-30
Publication date: 1994-10-26
Anticipated expiration: 2003-12-30

Abstract

The utility model relates to a directly-buried disposable corrugated expansion joint, which belongs to the compensation for a directly-buried pipeline. The expansion joint adopts a reinforcing rib plate, a reinforcing ring, etc., and the corrugated pipe is completely contained in an outer sleeve pipe. When the corrugated pipe is mode of stainless steel material, a pressure test assembly can be cancelled. Because the structure of the utility model is reasonable, the weld seam strength of the expansion joint can be conspicuously enhanced, and the weld seam and the corrugated pipe can not be easily broken. In the construction process of the utility model, the installation is convenient, and the construction cost is decreased. The pipeline is safe and reliable when the pipline is used for a long time.

Description

Directly-buried disposable bellows expand joint

The disposable corrugated expansion joint of a kind of directly buried type, it belongs to the directly buried pipeline compensation.

Along with the continuous development of pipe technology, the expansion joint of the existing multiple structural type of compensation of expanding with heat and contract with cold of pipeline is used in engineering reality.Facts have proved, the structure of most expansion joints is rational, yet also some expansion joint is unsatisfactory in practice, the disposable corrugated expansion joint that particularly in the past was used for direct buried pipeline is because its unreasonable structure, so that most carbon steel weld strengths of expansion joint self are not enough, can not bear the temperature difference stress that pipeline produces under action of thermal difference.Simultaneously, because of compensating element---bellows can not get due reinforcement with the end pipe weld seam that is connected, therefore must the strict weldquality that detects the expansion joint exposed parts in installation process, promptly check its seal, and make inconvenience be installed that operating expenses increases.

The purpose of this utility model is to be a kind of disposable corrugated expansion joint of direct buried piping design.This expansion joint can overcome the shortcoming of disposable expansion joint in the past, and safe and reliable in application in practice, engineering cost is cheap.

The technical solution of the utility model is: the disposable corrugated expansion joint of a kind of directly buried type, it mainly comprises end pipe, bellows, outer sleeve, and characteristics of the present utility model are that it also comprises the some reinforcement gussets that are distributed in four positions, two stiffening rings, bellows all is included among the outer sleeve.End pipe exposed parts length is greater than the twice of the heat affected zone length of this tube material electric arc welding.

The some reinforcement gussets that are distributed in four positions, be evenly distributed on the circumference of expansion joint, the shape of strengthening gusset can be that to go up the bottom be the trapezoidal of straight line or certain curve, or the bottom is the triangle of straight line or curve, strengthens the quantity of gusset and is determined by its intensity.

Two stiffening rings are welded on the bellows straight section, and stiffening ring can be manufactured with stainless steel or carbon steel, and the section configuration of stiffening ring can be rectangle, circle, square or trapezoidal.

Bellows all is included among little outer sleeve or the big outer sleeve, when bellows is stainless steel, can cancel its pressure testing assembly.

The guiding theory of aforementioned techniques scheme is: the disposable corrugated expansion joint of this directly buried type has installed the reinforcement gusset additional at four positions, the temperature difference stress that makes the weld seam of expansion joint be subjected in the pipe temperature change procedure is lower than its allowable stress, guarantee that expansion joint is safe and reliable in pipeline operation (comprising Installation and Debugging) process, its weld seam avoids destroyed.The straight section of bellows has installed stiffening ring additional, when bellows is stainless steel, can cancel the pressure testing assembly, needn't carry out the seal test by butt welded seam.But can not therefore reduce weld seam technological operation requirement.

Bellows is included in purpose in big outer sleeve or the little outer sleeve fully to be to change because of out-of-shape takes place the preheating pressure medium when the bellows preheating, shape after the variation will be subjected to the constraint of big outer sleeve and little outer sleeve, and be unlikely cooperation slip place that the external frame that changes the rear section drops on big outer sleeve and little outer sleeve, scratch the destruction bellows when preventing that big outer sleeve and little outer sleeve from sliding.

End pipe exposed parts length is greater than the twice of the heat affected zone length of this material when the electric arc welding, so that guarantee end pipe intensity effectively, the heat affected zone of the weld seam that has formed when having avoided the weld seam of expansion joint and two free ends to install and use overlaps, this is exactly in fact to be avoided holding pipe to reduce in the intensity of heat affected zone, guarantees the safety of pipeline in the spreadable life.

Effect of the present utility model is: the disposable corrugated expansion joint of this directly buried type, owing to adopted the reinforcement gusset, stiffening ring, and bellows all is included among the outer sleeve, and end pipe exposed parts length is greater than the twice of the heat affected zone length of this tube material electric arc welding, make that its structure is more reasonable, expansion joint weld seam in the pipeline running is difficult for destroyed, guarantees that the intensity of end pipe in the heat affected zone does not reduce.The reliable performance of expansion joint, the pipeline safety in the spreadable life is guaranteed.When bellows is stainless steel, can cancel the pressure testing assembly, and needn't carry out the seal test exposing weld seam, simplified work progress, reduced engineering cost.

Description of drawings: accompanying drawing 1 is the structural drawing of the disposable corrugated expansion joint of the utility model directly buried type.

Be an embodiment of the present utility model below, provide details of the present utility model by description and accompanying drawing to this embodiment.

Accompanying drawing 1 is the structural drawing of the disposable corrugated expansion joint of a kind of directly buried type.Wherein, bellows (14) is welded on small end end pipe (1) respectively, on the big end end pipe (10), end pipe (1), (10) exposed parts length is greater than the twice of the heat affected zone length of this material electric arc welding, the straight flange of bellows (14) is added with stiffening ring (17), available stainless steel of stiffening ring (17) or carbon steel are manufactured, its section configuration can be a rectangle, circular, square or trapezoidal, little outer sleeve (5), small end ring flat-plate (4), small end end pipe (1) welds respectively, weld seam is followed successively by a, b, small end is strengthened gusset (2) outward and is welded between small end ring flat-plate (4) and the small end end pipe (1), strengthening gusset (3) in the small end is welded between little outer sleeve (5) and the small end ring flat-plate (4), big outer sleeve (6), big end ring plate (8), big end end pipe (10) welds respectively, weld seam is followed successively by c, d, the outer gusset (9) of strengthening of big end is welded between big end ring plate (8) and the big end end pipe (10), strengthening gusset (7) in the big end is welded between big outer sleeve (6) and the big end ring plate (8), strengthen gusset (2), (3), (7), (9) be evenly distributed on the whole circumference, its shape can be that upward the bottom is the trapezoidal of straight line or certain curve, or the bottom is the triangle of straight line or curve, and its quantity is determined by intensity.Guide shell (11) is welded within the end pipe (1), and nameplate (12), compensation rate scale (13), working medium flow to indication (15) all attached on the outer sleeve.Xe is the specified compensation rate of expansion joint.During site operation, will hold the free port of pipe (1), (10) and pipeline butt welding to be integral, and be preheating to sleeve pipe (5), (6) slide in opposition to compensation rate scale (13) appointment numerical value, welding forms weld seam e at the e place with sleeve pipe (5), (6).Pressure testing assembly (16) person is arranged, need carry out air pressure or hydraulic pressure test to qualified.Pressure testing assembly (16), can be cancelled it, and needn't check weld seam a, b, c, d and e when bellows (14) is stainless steel for checking weld seam seal test usefulness.

Claims

1, the disposable corrugated expansion joint of a kind of directly buried type, mainly comprise end pipe, bellows and outer sleeve, feature of the present utility model is that it also comprises some reinforcement gusset [2], [3], [7], [9] that are distributed in four positions, two stiffening rings [17], bellows all is included among outer sleeve [5], [6], and end pipe exposed parts [1], [10] length are greater than the twice of the heat affected zone length of this tube material electric arc welding.

2, the disposable corrugated expansion joint of directly buried type according to claim 1, the reinforcement gusset (2), (3), (7), (9) that it is characterized in that some four positions are evenly distributed on the circumference of expansion joint, the shape of strengthening gusset can be that upward the bottom is the trapezoidal of straight line or certain curve, or the bottom is the triangle of straight line or curve, strengthens the quantity of gusset and determined by intensity.

3, the disposable corrugated expansion joint of directly buried type according to claim 2, it is characterized in that two stiffening rings (17) are welded on the bellows straight section, available stainless steel of stiffening ring (17) or carbon steel are manufactured, and its section configuration can be rectangle, circle, square or trapezoidal.

4, the disposable corrugated expansion joint of directly buried type according to claim 3 is characterized in that bellows (14) all is included among little outer sleeve (5) or the big outer sleeve (6).

5, the disposable corrugated expansion joint of directly buried type according to claim 4 is characterized in that can cancelling its pressure testing assembly (16) when bellows (14) is stainless steel.