WO2008019545A1

WO2008019545A1 - A compensating method and system for embedded long distance pipelins without support

Info

Publication number: WO2008019545A1
Application number: PCT/CN2007/000600
Authority: WO
Inventors: Zhanggen Song
Original assignee: Zhanggen Song
Priority date: 2006-08-11
Filing date: 2007-02-25
Publication date: 2008-02-21
Also published as: CN1975226A

Abstract

A compensating method and system for embedded long distance pipelines without support. The method, first the pipeline (1-6) is placed directly on the foundation arranged below ground level; Secondly, installing two or more rotating compensators (7-10, 14-15) for temperature-caused length changes at predetermined compensating distance or bent section of pipelines. The system, including transmission conduits that consists of many main pipes and branch pipes embedded underground and a compensating unit for expansion that consists of rotary compensator and connecting branch. The compensating unit is placed between main pipes, main pipes and branch pipes or branch pipes.

Description

Unsupported, long-distance compensation method and system for buried pipelines

The invention relates to a compensation method for underground pipelines and a corresponding pipeline system, in particular to a thermal (hot water or steam) transmission method for accumulating thermal expansion and contraction of a superficial or chemical pipeline, and a pipeline system, in particular to Unsupported, long-distance compensation method and system for buried pipelines. Background technique

At present, the buried heat transfer pipeline is a common pipeline. In order to overcome the damage of the pipeline caused by thermal expansion and contraction of the heat transmission pipeline, a length compensator must be installed at a certain distance during installation. Commonly used compensators are both cannulated and bellows. Since the compensating devices of the two structures have a limited amount of compensation, on the one hand, the compensation interval is small, and generally a compensator must be provided at 30-50 meters, so that the number of compensators required for the entire piping system is It is very large, increasing the construction cost. On the other hand, the pipe with the casing or bellows is installed. Because the pipe is disconnected, the pressure of the medium in the pipe creates a huge internal pressure at the bend, which often causes the pipe to crack. Therefore, in order to ensure the normal realization of compensation, a concrete fixed pile foundation weighing several hundred tons (up to 300 tons or more) must be set at a certain distance, and the cost is also huge. In addition, the entire pipeline must also withstand the tremendous pressure caused by ground deformation such as earthquake collapse, and also because the pipeline is equipped with many compensators, making the entire pipeline system more fragile and susceptible to external influences. The normal service life is only theoretical life. About half of them, as long as one of them breaks, the whole system can be paralyzed, not only causing huge economic losses, but also millions of yuan, and more than 100 million yuan. It will also bring serious social problems, such as Beijing Thermal Power. The group used to burst a corrugated pipe in the system, resulting in 560,000 people not heating for three months. Therefore, due to improper compensation methods, the existing thermal pipelines generally have problems of excessive investment and short service life. Summary of the invention

The object of the present invention is to solve the problem that the existing underground pipeline system has excessive investment due to improper compensation method and the safety life is not long, and a new buried pipeline is unsupported and does not generate internal pressure thrust. Long distance compensation method and system thereof.

The technical solution of the present invention is: An unsupported and long-distance compensation method for an underground pipeline, which is characterized in that firstly, the pipeline to be auxiliary is directly placed on the ground below the ground; secondly, two or two are installed at a set compensation interval or a turn More than two rotary compensators compensate for the change in length of the pipe due to thermal expansion and contraction.

The compensation interval is between 30-500 meters.

When the adjacent pipes are arranged on the same straight line or at right angles, at least four rotation compensators are installed at the compensation pitch or at the corners. ,

When the adjacent pipes are parallel to each other but not in the same straight line, at least two rotation compensators are installed at the joints thereof.

The foundation may be an untreated soft soil foundation.

The piping system matched with the above method can be:

An underground unsupported, large-span pipeline system comprising a plurality of sections of main pipelines or a plurality of sections of main pipelines and branch pipelines connected to the main pipelines, characterized in that the pipelines are directly pressed The designed path is additionally installed underground, and a compensation device composed of a rotary compensator and a connecting pipe for compensating the length of the pipe is installed at the set compensation joint or the corner. The compensating joint is located between the main pipe of the phase section, or at the corner of the main pipe, or at the junction of the main pipe and the branch pipe, or at the junction of the branch pipe and the branch pipe.

The compensating device is either an in-line compensating device, a parallel line compensating device, or a corner compensating device or any combination of two or all of them.

The same linear compensation device is composed of at least four rotary compensators and three-stage connecting tubes, wherein one ends of the first and second rotating compensators are respectively connected to the main pipe to be connected, and the other end is perpendicular to the other end. a connecting pipe and a second connecting pipe are connected, and the other ends of the first connecting pipe and the second connecting pipe are respectively connected to one ends of the corresponding third rotating compensator and the fourth rotating compensator, and the third connecting pipe parallel to the main pipe The two ends are respectively connected with one ends of the corresponding third rotation compensator and the fourth rotation compensator, and the adjacent two main ends are connected by the four rotation compensators and the three-stage connecting tubes to form an automatic compensation pipeline. The length of the channel.

The parallel line compensating device is composed of at least two rotating compensators and a connecting pipe. One ends of the two rotating compensators are respectively connected with corresponding main pipes to be connected, and the other ends of the two rotating compensators are connected by a connecting pipe.

The angle compensation device is composed of three rotation compensators and two sections of connecting tubes, one ends of the first rotation compensator and the second rotation compensator are connected to one ends of the corresponding main tubes, and the other ends thereof are respectively corresponding to the corresponding a connecting tube and one end of the second connecting tube are connected, the first connecting tube and the second connecting tube The other ends of the connecting tubes are respectively connected to both ends of the third rotation compensator.

The invention has the following advantages:

1. The invention greatly simplifies the installation process of the underground pipeline and the demand for the foundation. It is directly installed on the soft soil foundation, and only needs to excavate a trench for burying the transportation supervisor during construction, without the need for the foundation. Any treatment, and the traditional pile foundation is omitted, therefore, the installation process is simple and the installation cost can be greatly reduced.

2. Since the compensation amount of the present invention is equivalent to a stretchable parallelogram, the compensation length of each compensation unit can be designed as needed, so theoretically, the interval between adjacent compensation units can reach more than 500 meters.

3. Due to the constraint of no fixed pile foundation, therefore, the pipeline system of the invention has good compression resistance, does not generate internal pressure and blind plate force, and the service life of the pipeline can reach its theoretical life.

4. Wide application range, the invention can be used for all conveying pipelines that need to compensate the length of the pipeline, especially suitable for conveying pipelines with temperature difference of more than 70 degrees, such as hot water supply system in the northern region, steam supply system inside the enterprise, The transportation pipelines and waste heat recovery pipelines of raw materials and intermediates of chemical enterprises can be used for both straight pipelines and branch pipelines.

5. The whole pipeline system has the characteristics of rigid pipeline and flexible structure, which can be stretched and has anti-seismic function.

6. The whole system is designed and manufactured very conveniently and at low cost.

7. As the key rotating compensator of the whole system, it is a new product with excellent performance and compensation safety and reliability in recent years. It is gradually replacing the existing casing type and bellows compensator and applying it to underground pipelines. For the first time, it has produced special effects and solved the insurmountable technical problems of the long-term use of casing and bellows compensating devices. It has the advantages of simple structure and convenient manufacturing and installation. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view showing the structure of a combined piping system of the present invention.

2 is a schematic structural view of a rotary compensator of the present invention. detailed description

The invention will be further illustrated by the following structural drawings and examples.

As shown in Figure 1, 2.

The unsupported and large span compensation method of the buried pipeline of the present invention is to firstly install the pipe to be auxiliary The road is placed directly on the untreated soft soil below the ground; secondly, two or more rotary compensators are installed at the set compensation interval (up to 500 m) or at the turn to compensate for the pipeline The change of the length of the thermal expansion and contraction occurs. Finally, the surface of the soft compensator is covered with the surface soft soil to restore the original shape of the ground. It is not necessary to construct a fixed pile foundation during the whole installation and construction process.

1 is a detailed description of the overall concept of the present invention. In the specific implementation, the piping system of FIG. 1 may be fully implemented, and part of the piping system of FIG. 1 may also be implemented. The piping system may be a single piping system or The double pipe system can also be a three pipe system. The following is only a case of a pipe system. The multi-pipe system can be implemented with reference to a single pipe system.

An underground unsupported, long-distance compensation pipeline system, which will require auxiliary pipelines (main pipelines 1, 2, 3, 4, branch pipelines 5 connected to the main pipeline 4, and branch pipelines connected to the branch roads 5) 6 composition) directly laid in the underground according to the designed path, and at the set compensation joint (the compensation interval can be set according to the relevant design manual, the system using the system can be separated up to 500 meters, far greater than the present A compensation device consisting of a rotary compensator and a connecting pipe for compensating the length of the pipe is installed at a corner of 30-50 meters or at a corner. The compensation joint can be located between the main pipe of the straight section, or at the corner of the main pipe, or at the junction of the main pipe and the branch pipe and at the junction of the branch pipe and the branch pipe, as shown in Fig. 1.

The compensation device may be an in-line compensation device, a parallel line compensation device, or a corner compensation device or a combination of any two or all of them.

Referring to Figure 1, the same linear compensation device is composed of four rotary compensators 7, 8, 9, 10 and three segments of connecting tubes 11, 12, 13, wherein the first and second two rotary compensators 7, 8 One end is connected to the main pipe 2, 3 which is directly connected to be connected, and the other end is connected to the first connecting pipe 11 and the second connecting pipe 12 which are perpendicular to each other, and the first connecting pipe 11 and the second connecting pipe 12 are connected. The other end is connected to one end of the corresponding third rotation compensator 9 and the fourth rotation compensator 10, respectively, and the two ends of the third connecting pipe 13 parallel to the main pipe are respectively associated with the corresponding third rotation compensator 9 and the fourth rotation. One end of the compensator 10 is connected, and two adjacent main pipes 2, 3 are connected by the four rotary compensators 7, 8, 9, 10 and the three-stage connecting pipes 11, 12, 13 to automatically compensate the length of the pipe. Channel.

The parallel line compensating device is composed of two rotating compensators 14 and 15 and a length of connecting pipe 16, and one end of each of the two rotating compensators 14 and 15 is respectively connected with a corresponding main pipe 1 which is parallel to each other but not on the same line. 2, the other ends of the two rotary compensators 14, 15 are connected by a connecting pipe 16. The angle compensation device is composed of three rotation compensators 17, 18, 19 and two sections of connecting tubes 20, 21, one end of the first rotation compensator 17 and the second rotation compensator 19 and their respective mutually perpendicular main tubes 3, 4 are connected at one end, and the other ends thereof are respectively connected to one ends of the corresponding first connecting pipe 20 and the second connecting pipe 21, and the other ends of the first connecting pipe 20 and the second connecting pipe 21 are respectively connected with the third rotating compensator The two ends of 18 are connected.

The compensation at the branch pipe 5 of the branch pipe 5 and the branch pipe 5 is the same as the corner compensation.

In Fig. 1, A, B, C, D, E, F represent the midpoints of the main pipes 1, 2, 3, 4 and the branch pipes 5, 6, respectively, which are the starting points for the expansion or contraction of the main pipe or the branch pipe, and the compensation devices a, b, c , d, e respectively represent three different compensation devices, where a is a parallel line compensation device for compensating for thermal expansion and contraction between A and B, and b is a linear compensation device for compensating between C and C Thermal expansion and contraction, c is a rotation angle compensation device, used to compensate (the thermal expansion and contraction between D, d is equivalent to the angle compensation device, used to compensate for the thermal expansion and contraction between 0 and E, e is equivalent to the corner A compensating device for compensating for thermal expansion and contraction between E and F.

The rotary compensator of this embodiment is shown in FIG. 2, which comprises a core tube 1', a sealing gland 3', a sealing seat 5', a connecting tube 7', and one end of the core tube 1' is inserted into the connecting tube 7', and is connected. The pipe 7' can adopt a reducing pipe joint commonly used in engineering, and the connecting pipe 7' is welded and connected to one end of the sealing seat 5' and is set on the core pipe, and is provided at one end of the core pipe 1' extending into the connecting pipe 7'. An annular outer boss 8' (the number of the annular outer bosses can also be experimentally determined according to the medium temperature and the pipe pressure), and an annular inner boss 9' is provided on the inner surface of the sealing seat 5' (in the annular shape) The number of bosses can also be experimentally determined according to the medium temperature and the pipe pressure), and the sealing gland 3' is fitted over the core tube 3' and inserted into the other end of the sealing seat 5' and mounted on the inner surface of the sealing seat 5'. The toroidal seal 4' between the outer surfaces of the core tube 1' abuts, the sealing gland 3' and the sealing seat 5' are connected by a connecting piece 2', at least formed between the sealing seat 5' and the core tube 1' One is made up of the inner surface of the sealing seat 5', the outer surface of the core tube 1', and the annular outer boss 8', a sealing cavity formed on the side of the inner boss 9', in which the end face seal 6' is mounted, and the seals 4', 6' can be made of high temperature resistant high pressure sealing material, such as high purity flexible oil immersion Graphite seals.

In order to ensure the flexibility of rotation during compensation, the annular inner boss 9' of the sealing seat 5' which is in contact with the outer surface of the core tube 1' and the sealing gland 3 which is in contact with the outer surface of the core tube 1' may be specifically implemented. A ball 10 is mounted on the ball 10, and the ball 10 can also be mounted only on the sealing gland 3' which is in contact with the outer surface of the core tube 1, or can be mounted in one turn, because the rotation speed is slow when rotating. The relative angle of rotation is limited, and the flexibility required for rotation is not very high. Of course, if the ball 10' is installed, the effect will be better. In the specific implementation, in order to increase the sealing effect, the number of the end face seals 6' and the toroidal seals 4' can be appropriately increased, which can be realized only by increasing the inner and outer annular step faces in the manufacture. As can be seen from the above, the unsupported installation of the conveying pipe and the long distance setting of the compensation point are the most distinguishing features of the present invention from the existing piping system, and Figure 1 shows a structure comprising three common compensation units. In the specific implementation, the corresponding compensation unit can be selected according to needs, and as a person skilled in the art, various pipe compensation units can be designed by using the principle, even at the midpoint of each section of the main section. The prior art is fixed and should also be considered as an equivalent replacement of the present invention, that is, the combination of the rotary compensator into a compensation unit for thermal expansion compensation of the underground pipe is considered to be encompassed by the present invention.

Claims

Claim

1. An unsupported and long-distance compensation method for buried pipelines, characterized in that firstly, the pipeline to be auxiliary is placed directly on the ground below the ground; secondly, two installations are installed at the set compensation interval or at the turn. One or more rotation compensators to compensate for changes in the length of the pipe due to thermal expansion and contraction.

2. The unsupported, long-distance compensation method for a buried pipeline according to claim 1, wherein the compensation pitch is between 30 and 500 meters.

3. The unsupported, long-distance compensation method for an underground pipeline according to claim 1, wherein the adjacent pipes are installed at the same straight line or at a right angle, at least at a compensation interval or a corner. There are four rotary compensators.

4. The unsupported, long-distance compensation method for a buried pipeline according to claim 1, wherein said adjacent pipes are parallel to each other but not in the same straight line, and at least two rotations are installed at the joint thereof. Compensator.

5. The unsupported, long-distance compensation method for a buried pipeline according to claim 1, wherein said foundation is an untreated soft soil foundation.

6. An underground unsupported, long-distance compensation pipeline system, comprising a pipeline consisting of a plurality of sections of main pipelines or consisting of a plurality of sections of main pipelines and branch pipelines connected to the main pipelines, characterized in that the pipelines are Directly laid in the underground according to the designed path, a compensation device consisting of a rotary compensator and a connecting pipe for compensating the length of the pipe is installed at the set compensation joint or corner.

7. The buried unsupported, long-distance compensation duct system according to claim 6, wherein the compensating device is either an in-line compensating device, or a parallel line compensating device, or a corner compensating device or Any two or all combinations.

8. The buried unsupported, long-distance compensation pipeline system according to claim 7, wherein the same linear compensation device comprises at least four rotary compensators and three-stage connecting tubes, wherein the first and the One end of the two rotary compensators is respectively connected to the main pipe to be connected, and the other end is connected to the first connecting pipe and the second connecting pipe perpendicular to each other, and the other ends of the first connecting pipe and the second connecting pipe are respectively corresponding to The third rotation compensator is connected to one end of the fourth rotation compensator, and two ends of the third connection pipe parallel to the main pipe are respectively connected to one ends of the corresponding third rotation compensator and the fourth rotation compensator.

9. The buried unsupported, long-distance compensation duct system according to claim 7, wherein said parallel line compensating device comprises at least two rotating compensators and a length of connecting tubes, and two rotating compensators One end is respectively connected to a corresponding main pipe to be connected, and the other ends of the two rotary compensators are connected by a connecting pipe.

10. The buried unsupported, long-distance compensation duct system according to claim 7, wherein said angle compensation device comprises three rotary compensators and two sections of connecting tubes, a first rotating compensator and a One end of the two rotary compensator is connected to one end of the corresponding main pipe, and the other ends thereof are respectively connected to one ends of the corresponding first connecting pipe and the second connecting pipe, and the other ends of the first connecting pipe and the second connecting pipe are respectively respectively The three rotary compensators are connected at both ends.