阅读说明：本技术 保护u形弯管的装置及方法 (Device and method for protecting U-shaped bent pipe ) 是由 钱保娴 王飞 张霖峰 刘浩 张宇文 于 2020-07-02 设计创作，主要内容包括：本发明涉及保护U形弯管的装置及方法,属于供热管道工程技术领域；目的是降低U形弯管的保护施工难度,且提高其适用性；技术方案为,为绕过障碍物平行铺设的供水管和回水管形成U形管路,供水管位于回水管与障碍物之间,在供水管的U形结构的两端固定连接一弧形钢,弧形钢与供水管的U形结构分别位于障碍物的两侧,弧形钢与供水管位于同一水平面；弧形钢将管道所受力抵消,与现有技术相比,本发明装置的结构简单、布置灵活；降低保护施工难度,且适应各种障碍物环境。(The invention relates to a device and a method for protecting a U-shaped bent pipe, belonging to the technical field of heat supply pipeline engineering; the purpose is to reduce the protection construction difficulty of the U-shaped bent pipe and improve the applicability of the U-shaped bent pipe; the technical scheme is that a U-shaped pipeline is formed by a water supply pipe and a water return pipe which are laid in parallel around a barrier, the water supply pipe is positioned between the water return pipe and the barrier, two ends of a U-shaped structure of the water supply pipe are fixedly connected with arc-shaped steel, the arc-shaped steel and the U-shaped structure of the water supply pipe are respectively positioned at two sides of the barrier, and the arc-shaped steel and the water supply pipe are positioned on the same horizontal plane; the arc steel counteracts the force borne by the pipeline, and compared with the prior art, the device has the advantages of simple structure and flexible arrangement; reduces the construction protection difficulty and adapts to various obstacle environments.)

1. The device for protecting the U-shaped elbow comprises a U-shaped pipeline formed by the U-shaped elbow bypassing a barrier (1), wherein the U-shaped pipeline comprises a water supply pipe (2) and a water return pipe (3) which are laid in parallel, and the plane of the barrier (1) is vertical to the water supply pipe (2) and the water return pipe (3); the water supply device is characterized in that the water supply pipe (2) is located between the water return pipe (3) and the obstacle (1), two ends of a U-shaped structure of the water supply pipe (2) are fixedly connected with arc-shaped steel (4), the arc-shaped steel (4) and the U-shaped structure of the water supply pipe (2) are located on two sides of the obstacle (1) respectively, the arc-shaped steel (4) and the water supply pipe (2) are located on the same horizontal plane, and the arc-shaped steel (4) and the U-shaped pipeline are coaxially symmetrical.

2. The device for protecting a U-shaped bent pipe according to claim 1, wherein a water return pipe (3) is positioned between the water supply pipe (2) and the obstacle (1), the water return pipe (3) and both ends of the U-shaped structure of the water supply pipe (2) are respectively connected through a pipe hoop (5) and a fixing steel (6), and both ends of the arc steel (4) are fixedly connected to both ends of the U-shaped structure of the water return pipe (3).

3. Device for protecting a U-bend according to claim 1 or 2, characterized in that the obstacle (1) is located in a plane parallel to the water supply pipe (2) and the water return pipe (3), and the arc-shaped steel (4) is arranged perpendicular to the water supply pipe (2) and the water return pipe (3).

4. Device for protecting a U-bend according to claim 2, characterized in that the ferrule (5) and the fixed steel (6) are externally provided with a passive film.

5. The apparatus for protecting a U-bend according to claim 2, wherein the return pipe (3) is connected to both ends of the U-shaped structure of the water supply pipe (2) by means of a multi-ferrule (5) and a fixing steel (6), respectively.

6. Device for protecting a U-bend according to claim 1, characterized in that said arc-shaped steel (4) is welded at both ends of the U-shaped structure of the water supply pipe (2).

7. Device for protecting a U-bend according to claim 1, characterized in that the arc-shaped steel (4) is externally provided with a passive film.

8. Device for protecting a U-bend according to claim 1, characterized in that said arc-shaped steel (4) is provided with a plurality of pieces.

9. A device for protecting a U-bend according to claim 1, wherein the arc steel (4) is any one of I-steel, channel steel, U-steel, and H-steel.

10. A protection method of a U-shaped bent pipe is characterized in that the U-shaped bent pipe is used for forming a U-shaped pipeline by bypassing a barrier (1), the pipeline comprises a water supply pipe (2) and a water return pipe (3) which are laid in parallel, and the plane of the barrier (1) is vertical to the water supply pipe (2) and the water return pipe (3); the device is characterized in that two ends of an arc-shaped steel (4) are welded at two ends of a U-shaped structure of a water supply pipe (2), or two ends of a U-shaped structure of a water return pipe (3) and the water supply pipe (2) are respectively connected through a pipe hoop (5) and a fixing steel (6) and then two ends of the arc-shaped steel (4) are welded at two ends of the U-shaped structure of the water return pipe (3), the arc-shaped steel (4) and the U-shaped pipeline are respectively located at two sides of an obstacle (1), the arc-shaped steel (4) and the U-shaped pipeline are located on the same horizontal plane, and the arc-shaped steel (4) and the U-shaped pipeline are coaxially symmetrical.

Technical Field

The invention belongs to the technical field of heat supply pipeline engineering, and particularly relates to a device and a method for protecting a U-shaped bent pipe.

Background

The following situations are often encountered in the design and construction of the direct burial heat supply pipeline: in the process of routing, a pipe network often encounters a barrier such as a tree or a telegraph pole and the like to block in the direction of laying the pipeline, and under the condition that the space around the barrier is not large enough and a square compensator cannot be arranged, how to safely bypass the barrier becomes a problem to be considered by designers.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a device and a method for protecting a U-shaped bent pipe, and aims to reduce the difficulty of protection construction of the U-shaped bent pipe and improve the applicability of the U-shaped bent pipe.

In order to achieve the above object, the present invention is achieved by the following technical solutions.

The device for protecting the U-shaped bent pipe is used for forming a U-shaped pipeline by bypassing a barrier, the U-shaped pipeline comprises a water supply pipe and a water return pipe which are laid in parallel, and the plane of the barrier is vertical to the water supply pipe and the water return pipe; the water supply pipe is located between the water return pipe and the barrier, two ends of the U-shaped structure of the water supply pipe are fixedly connected with arc-shaped steel, the arc-shaped steel and the U-shaped structure of the water supply pipe are located on two sides of the barrier respectively, the arc-shaped steel and the water supply pipe are located on the same horizontal plane, and the arc-shaped steel and the U-shaped pipeline are coaxially symmetrical.

Furthermore, the water return pipe is located between the water supply pipe and the barrier, the two ends of the U-shaped structure of the water return pipe and the two ends of the U-shaped structure of the water supply pipe are respectively connected through a pipe hoop and fixing steel, and the two ends of the arc-shaped steel are fixedly connected to the two ends of the U-shaped structure of the water return pipe.

Further, the outer parts of the pipe hoop and the fixed steel are provided with passive films.

Furthermore, the plane of the barrier is parallel to the water supply pipe and the water return pipe, and the arc-shaped steel is perpendicular to the water supply pipe and the water return pipe.

Furthermore, the water return pipe is connected with two ends of the U-shaped structure of the water supply pipe through a plurality of sleeve hoops and fixing steel respectively.

Further, the arc-shaped steel is welded at two ends of the U-shaped structure of the water supply pipe.

Further, a passivation film is arranged outside the arc-shaped steel.

Further, the arc-shaped steel is provided with a plurality of pieces.

Further, the arc-shaped steel is any one of I-shaped steel, channel steel, U-shaped steel and H-shaped steel.

A protection method of a U-shaped bent pipe is characterized in that the U-shaped bent pipe is a U-shaped pipeline formed by bypassing obstacles, the pipeline comprises a water supply pipe and a water return pipe which are laid in parallel, and the plane of the obstacles is vertical to the water supply pipe and the water return pipe; welding two ends of an arc steel at two ends of a U-shaped structure of a water supply pipe, or welding two ends of the arc steel at two ends of a U-shaped structure of the water return pipe after connecting the water return pipe and the two ends of the U-shaped structure of the water supply pipe through a pipe hoop and fixed steel respectively, wherein the arc steel and the U-shaped pipeline are located at two sides of an obstacle respectively, the arc steel and the U-shaped pipeline are located at the same horizontal plane, and the arc steel and the U-shaped pipeline are coaxially symmetrical.

The temperature of the water supply pipe is much higher than that of the water return pipe, so that the U-shaped bent pipe on the water supply pipe is mainly protected. When the water supply pipe is arranged on one side close to the obstacle, the arc-shaped steel is directly welded on the water supply pipe, as shown in figure 4; when the water supply pipe is far away from one side of the barrier, the arc-shaped steel is arranged on the outer side, the occupied space position is large, and the compensation effect is weak when the compensation effect is more inner, so that the water supply pipe and the water return pipe are fixed together through the pipe hoop and the fixing steel, and the arc-shaped steel is welded on the water return pipe, as shown in fig. 5. In order to make the connection between the water supply pipe and the water return pipe more stable, two fixed steels can be respectively arranged on two sides of the U-shaped bent pipe, and the schematic cross section of the fixed connection between the water supply pipe and the water return pipe is shown in fig. 6.

When the arc-shaped steel is directly welded on the water supply pipe, the stress diagram of the arc-shaped steel is shown in fig. 7. Assuming that when the pipeline is not welded with arc steel, the H point is fixed when the pipeline runs, and the thrust force applied to the H point can be calculated according to the stress analysis of the fixed pier in the direct burial heat supply pipeline engineering design as follows:

l in FIG. 7₁Is the distance from the point H to the end of the U-bend, L₂The distance from the point H to the movable end of the U-shaped bent pipe;

L₁≧L_min，L₁≧L₂and L is_max>L₂Time of flight

H=N_a1-0.8(F_minL₂+P_t2)

Wherein N is_a1=F_minL_max+P_t1

N_a1Left end axial force at point H, L_minIs the minimum transition segment length, L_maxAt the maximum transition length, P_t1、P_t2The resistance of the movable end to the expansion of the pipeline.

（2）L_min>L₁>L₂Time of flight

H=(F_maxL₁+P_t1)-0.8(F_minL₂+P_t2)

After the arc-shaped steel is added, the force of the arc-shaped steel on the pipeline can be decomposed into force F along the axial direction of the pipeline₁And a radial force F₂The U-shaped pipe is in bilateral symmetry, the left side and the right side of the arc-shaped steel can be offset by the axial force along the pipeline, and the axial force perpendicular to the pipeline can be offset by the elastic counter force of the soil.

When the arc-shaped steel is welded on the water return pipe, the axial force of the water supply pipe is transmitted to the water return pipe through the fixing steel, and the direction of the thrust of the arc-shaped steel bearing the water supply and return pipes is also shown in fig. 7.

The arc steel bears the thrust of the pipeline: f₁=H；F₂Counteracting the restraining force of the soil and the AB section axial internal force.

The relative positions of the arc-shaped steel and the heat supply pipeline in fig. 7 can be determined according to the specific position and size of the obstacle. Smaller θ, the same F, F₁The larger the pipe axial thrust that the arc steel can bear.

In order to avoid damaging the fixed knot during operation, the fixed knot can be reinforced in a rib plate reinforcing mode.

The metal is directly buried in the soil and is easy to corrode, and a passivating agent or a film forming agent can be used for processing to enable the surface to generate a stable passivating film, or the surface is subjected to paint spraying processing, or an electrochemical protection method is adopted to protect the surface.

Compared with the prior art, the invention has the beneficial effects that. Compared with other technical schemes, the method for using the arc steel has simple structure and flexible arrangement.

Compared with the first technical scheme, the technical scheme has the advantages of no numerous stress danger points, short involvement distance, small construction difficulty and improved safety, and solves the problem of difficult solution of sudden obstacles.

Compared with the second technical scheme, the construction and installation conditions of the technical scheme are relatively loose, the size range of the applicable U-shaped pipe is larger, a compensator is not required to be installed for checking the small chamber, the engineering cost is reduced, the safety of the pipeline is improved, and the solution to sudden obstacles is more flexible.

Compared with the third technical scheme, the third technical scheme has the advantages that large-size fixed piers do not need to be installed, requirements on construction conditions are greatly reduced, the size range of applicable U-shaped pipes is wider, influence on design, construction and surrounding building planning of other pipelines is avoided, and the problem of sudden obstacles is solved more simply.

The arc steel can be prefabricated and produced in series according to the factory such as curvature radius, size and the like, the welding quality is high, and the selection is convenient.

Drawings

FIG. 1 is a schematic view of a prior art solution;

FIG. 2 is a schematic diagram of a second prior art solution;

FIG. 3 is a schematic diagram of a prior art solution III;

FIG. 4 is a schematic layout of the protective U-bend configuration of example 1 of the present invention;

FIG. 5 is a schematic layout of the protective U-bend configuration of example 2 of the present invention;

FIG. 6 is a schematic cross-sectional view of the water supply pipe and the water return pipe in FIG. 5;

FIG. 7 is a schematic view of the stress of the arc-shaped steel;

wherein, 1 is the barrier, 2 is the delivery pipe, 3 is the wet return, 4 is the arc steel, 5 is the ferrule, 6 is the fixed steel, 7 is the compensator, 8 is the anchor block.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.