CN215410704U

CN215410704U - Pipeline connecting device for crossing active fault

Info

Publication number: CN215410704U
Application number: CN202121440638.9U
Authority: CN
Inventors: 伍鹤皋; 徐文韬; 石长征
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-01-04
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses a pipeline connecting device for passing through an active fault, wherein steel pipes are disconnected in an active fault area and connected through a double-corrugated sleeve, the double-corrugated sleeve comprises an inner corrugated pipe, an outer corrugated pipe, a large annular plate, a small annular plate, an inner protection pipe and an outer protection pipe, the steel pipes on two sides are respectively welded with an end pipe, the large annular plate and the small annular plate are respectively welded on the two end pipes, and two ends of the inner corrugated pipe are respectively connected on the two end pipes; the radial outer sides of the two annular plates are respectively welded with a connecting pipe for installing an outer corrugated pipe; the inner protection tube and the outer protection tube are respectively fixed on the small and large circular plates, the other end of the inner protection tube extends into the outer protection tube to form a staggered layer alternate structure, and a flexible filling layer is arranged between alternate gaps of the inner protection tube and the outer protection tube. The structure of the utility model has good stability against external pressure, rigid-flexible combination, and the functions of axial tension-compression deformation and transverse shear resistance of the tube.

Description

Pipeline connecting device for crossing active fault

Technical Field

The utility model belongs to the field of water delivery engineering, relates to an underground water delivery steel pipe technology, and particularly relates to a pipeline connecting device for crossing an active fault.

Background

At present, the anti-dislocation measures of the engineering buried hydraulic tunnel at home and abroad mainly comprise a section over-excavation method and the arrangement of an outer-wrapped shock-absorbing layer, or the combination of the section over-excavation method and the outer-wrapped shock-absorbing layer. The overbreak method needs to prejudge the dislocation amount of the fault in advance, and properly enlarges the section size of the possible fault position according to the pipe diameter multiplied by a certain safety factor. The damping layer wrapping method is characterized in that a buffer layer is arranged between surrounding rocks and a pipeline structure to absorb partial dislocation energy, so that the direct action of a fault and the pipeline structure is avoided, the displacement generated by sudden dislocation of the fault layer in an earthquake is relieved, and the normal use of the structure is ensured as far as possible. The overbreak method has certain uncertainty, needs to have more perfect geological survey data, is not suitable for large-scale fault fracture zones, is limited to the difficulty of underground expanding excavation, and has poor economy. Although the outer-wrapping shock-absorbing layer method is relatively simple in construction and relatively high in applicability, the absorption capacity of the outer-wrapping shock-absorbing layer method on the dislocation energy is limited, and the anti-breaking effect is slightly poor.

Along with the increasing scale of diversion works, the internal water pressure to be born is increased, the problems of water seepage and water load of the traditional underground tunnel project are more practical, and the stability of external pressure resistance of the deeply buried underground buried steel pipe under the action of high external water pressure is more outstanding, so that the anti-fault-breaking measures suitable for the underground buried steel pipe are provided according to the stress characteristic of the steel pipe, which is urgent and necessary, and can provide important guarantee for part of over-active fault diversion works in future.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned problems, the present invention provides a pipe connection device for crossing active fault, the anti-breaking structure has good stability against internal pressure and external pressure, rigid and flexible combination, and can adapt to various types of fault dislocation deformation, and after pipe axial tension and compression and transverse shearing, the steel pipe can still keep safe operation.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a pipeline connecting device for passing through active fault, is including burying in underground steel pipe, its characterized in that: the steel pipes are disconnected in the overactive fracture area and connected through a double-corrugated sleeve, the double-corrugated sleeve comprises an inner corrugated pipe, an outer corrugated pipe, a large annular plate, a small annular plate, an inner protection pipe and an outer protection pipe, the steel pipes on two sides of the double-corrugated sleeve are respectively welded with an end pipe, the large annular plate and the small annular plate are respectively welded on the two end pipes, and two ends of the inner corrugated pipe are respectively connected to the two end pipes; the radial outer sides of the two annular plates are respectively welded with a connecting pipe, and two ends of the outer corrugated pipe are respectively connected to the two connecting pipes; the outer protection tube end is fixed on the large annular plate, the inner protection tube end is fixed on the small annular plate, the other end of the inner protection tube extends into the outer protection tube to form a staggered layer alternate structure, and a flexible filling layer is arranged between alternate gaps of the inner protection tube and the outer protection tube.

Further, the flexible filling layer is a flexible foaming agent.

Furthermore, the flexible filling layer is two annular filling layers arranged between the inner protection pipe and the outer protection pipe.

Furthermore, the inner corrugated pipe adopts non-uniform corrugations, wavelets are adopted at the head end and the tail end, and a large wave is arranged in the middle.

Further, the wave trough of the wavelet, the wave trough of the large wave and the wave crest of the large wave are in arc transition with the same radius, and the radius of the transition arc adopted by the wave crest of the wavelet is half of the wave trough of the small wave.

Further, the large wave adopts U-shaped ripples.

Further, for the inner corrugated pipe, an inner stiffening ring for enhancing the binding effect on the corrugated pipe is arranged at the wave trough between every two adjacent wave crests.

Furthermore, the outer corrugated pipe adopts a corrugated pipe which has the same structure as the inner corrugated pipe but has opposite corrugation directions, an external force ring for enhancing the binding effect on the corrugated pipe is arranged at the wave trough between every two adjacent wave crests of the outer corrugated pipe, and a gap for deformation is reserved between the inner corrugated pipe and the outer corrugated pipe.

Furthermore, a guide plate for preventing the corrugated pipe from causing turbulent flow to water flow is arranged on the inner wall of the steel pipe in the upstream direction in front of the double-corrugated sleeve.

According to the pipeline connecting device for passing through the active fault, during normal operation, the inner corrugated pipe of the double-corrugated sleeve bears internal water pressure under the hoop of the inner reinforcing ring, and the outer corrugated pipe made of the same material is used for preventing the inner corrugated pipe from falling off from the inner reinforcing ring under the external water pressure to sink inwards, so that the effect of resisting high external water pressure is achieved; after the fault is in dislocation, under the condition of small dislocation amount, radial deformation occurs along with small dislocation of the double-corrugated sleeve on the flexible filling layer between the inner protection pipe and the outer protection pipe, and the dislocation displacement amount can be completely absorbed. After the dislocation quantity is increased, the double-corrugated sleeve is pulled and pressed or sheared and deformed along with the dislocation direction of the fault, the multi-section U-shaped corrugations have higher geometric extension spaces and can provide axial or transverse displacement for the steel pipe, and the soft cushion layer provides a space for the displacement of the double-corrugated sleeve and concentrates the dislocation quantity of the fault. When the fault amount is large or the fault influence range is large, a plurality of the structure can be arranged in the engineering and used in parallel.

Compared with the prior art, the utility model has the following advantages:

the double-corrugated sleeve can effectively deal with high external water pressure on the embedded steel pipe, so that the external pressure resistance stability of the whole composite structure is improved.

The outer sheath is wrapped on the outer side of the corrugated pipe, so that the installation and the use of the double-corrugated sleeve are not limited by the environment. The whole construction is simple and convenient, a large installation space does not need to be reserved during pipeline construction, and the difficulty of engineering construction and the installation cost are reduced.

The outer sleeve can not only cope with radial dislocation deformation of the steel pipe, but also cope with axial deformation.

Drawings

FIG. 1 is an axial cross-sectional view of a pipe coupling for crossing an active fault;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

figure 3 is a schematic view of a pipe coupling having two layers of flexible blowing agent.

In the drawings, 1-double corrugated sleeve; 2-end pipe; 3-inner bellows; 4-an inner stiffening ring; 5-external bellows; 6-external force ring; 7-a flow guide plate; 8-large circular plate; 9-small annular plate; 10-inner protective tube; 11-a flexible blowing agent; 12-an outer protective tube; 13-a connecting tube; 14-steel pipe.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that, in the present invention, the features of the embodiments and examples may be combined with each other, and the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions of the utility model, and any modifications of the structures, changes of the proportion relations, or adjustments of the sizes, should still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

As shown in fig. 1 and 2, the present invention provides a pipeline connecting device for crossing an active fault, which comprises a steel pipe 14 buried underground, wherein the steel pipe 14 is disconnected in an overactive fault area and connected through a double-corrugated sleeve 1, the double-corrugated sleeve 1 comprises an inner corrugated pipe 3, an outer corrugated pipe 5, a large annular plate 8, a small annular plate 9, an inner protection pipe 10 and an outer protection pipe 12, the large annular plate 8, the small annular plate 9, the inner protection pipe 10 and the outer protection pipe 12 form an outer sheath structure, the steel pipe 14 on two sides of the double-corrugated sleeve 1 is respectively welded with an end pipe 2, the large annular plate and the small annular plate are respectively welded on the two end pipes 2, and two ends of the inner corrugated pipe 3 are respectively connected to the two end pipes 2; the radial outer sides of the two annular plates are respectively welded with a connecting pipe 13, and two ends of the outer corrugated pipe 5 are respectively connected to the two connecting pipes 13; the end part of the outer protection tube 12 is fixed on the large annular plate 8, the end part of the inner protection tube 10 is fixed on the small annular plate 9, the other end of the inner protection tube 10 extends into the outer protection tube 12 to form a staggered layer penetrating structure, and a flexible filling layer is arranged between penetrating gaps of the inner protection tube 10 and the outer protection tube 12.

The left side and the right side of the double-corrugated sleeve 1 are respectively provided with an end pipe 2 connected with steel pipes 14 at two sides, the opposite inner sides of the two end pipes 2 are connected with inner corrugated pipes 3, the inner corrugated pipes 3 adopt non-uniform corrugations, small waves are adopted at the head and the tail, and large waves are adopted in the middle; the large wave adopts U-shaped ripples, the wave height, the wave width and the wave number are determined by the set displacement compensation amount, if the arc-shaped segment of the large wave is a semicircle with the radius of 2a, the small wave consists of a semicircle with the radius of a, an 1/4 circle with the radius of 2a and two arcs. An inner stiffening ring 4 is arranged in the trough between every two wave crests, the binding effect on the corrugated pipe is enhanced, and the inner corrugated pipe 3 is prevented from being excessively deformed and losing effect under the action of high internal water pressure.

The radial outer sides of the two annular plates are respectively welded with a connecting pipe 13, and the outer corrugated pipes 5 are respectively connected to the two connecting pipes 13. The outer corrugated pipe 5 is similar to the inner corrugated pipe 3 in structure and opposite in inner and outer directions, is mainly used for resisting higher external water pressure generated by high underground water level under the deep-buried condition, avoids fatigue fracture of a single-layer corrugated pipe due to internal and external stress circulation, and is longer in service life. An outer stiffening ring 6 is arranged in the trough between every two wave crests, and a certain gap is reserved in the middle when the inner corrugated pipe 3 and the outer corrugated pipe 5 are installed. The corrugated sections are main parts for absorbing the dislocation, the corrugated pipes at two ends cannot deform and concentrate due to the design of large waves and small waves, and the whole stress of the corrugated pipes is more reasonable when the corrugated pipes bear pressure.

As a more preferable embodiment, a flow deflector 7 is arranged inside the double corrugated sleeve 1, specifically, the flow deflector 7 is arranged on the inner wall of the steel pipe 14 at the front end in the flow-facing direction, and the flow deflector 7 covers the whole inner corrugated pipe 3, that is, the axial length of the flow deflector 7 is greater than that of the inner corrugated pipe 3 under the condition of maximum extension.

The outer sheath is used for protecting the inner corrugated pipe and the outer corrugated pipe, the left end of the inner protection pipe 10 is inserted into the outer protection pipe 12 by 10-24cm, the insertion depth can be determined according to the actual deformation length of the inner corrugated pipe and the outer corrugated pipe, the flexible foaming agent 11 is filled in the inner layer of the outer protection pipe 12 and the outer layer of the inner protection pipe 10 in a pouring mode, mud and the like in concrete pouring are prevented from flowing in to generate precipitation or abrasion to prevent normal operation, and thin-layer porous polyurethane foaming agent filling materials with the width of 3-7cm are filled in the flexible foaming agent 11 more preferably.

As a more preferable embodiment, as shown in FIG. 3, the flexible foaming agent 11 may be provided with two annular filling layers, so as to improve the protection effect of the outer sheath and prevent the protection from failing after the inner and outer bellows are too much stretched.

Guide plate 7, hug closely interior bellows 3, length can wrap up in bellows 3 can, minimize the influence of 1 section of double-corrugated sleeve pipe to rivers and silt.

The above-described embodiments are merely illustrative of the principles and operation of the present invention, and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a pipeline connecting device for passing through active fault, is including burying in underground steel pipe, its characterized in that: the steel pipes are disconnected in the overactive fracture area and connected through a double-corrugated sleeve, the double-corrugated sleeve comprises an inner corrugated pipe, an outer corrugated pipe, a large annular plate, a small annular plate, an inner protection pipe and an outer protection pipe, the steel pipes on two sides of the double-corrugated sleeve are respectively welded with an end pipe, the large annular plate and the small annular plate are respectively welded on the two end pipes, and two ends of the inner corrugated pipe are respectively connected to the two end pipes; two connecting pipes are respectively welded on the radial outer sides of the two annular plates, and two ends of the outer corrugated pipe are respectively connected to the two connecting pipes; the outer protection tube end is fixed on the large annular plate, the inner protection tube end is fixed on the small annular plate, the other end of the inner protection tube extends into the outer protection tube to form a staggered layer alternate structure, and a flexible filling layer is arranged between alternate gaps of the inner protection tube and the outer protection tube.

2. The pipe coupling according to claim 1, wherein: the flexible filling layer is a flexible foaming agent.

3. The pipe coupling according to claim 1, wherein: the flexible filling layer is two annular filling layers arranged between the inner protection pipe and the outer protection pipe.

4. The pipe coupling according to claim 1, wherein: the inner corrugated pipe adopts non-uniform corrugations, small waves are adopted at the head end and the tail end, and a large wave is arranged in the middle.

5. The pipe coupling according to claim 4, wherein: the wave trough of the wavelet and the wave trough and the wave crest of the large wave are in arc transition with the same radius, and the radius of the transition arc adopted by the wave crest of the wavelet is half of the wave trough.

6. The pipe coupling according to claim 4, wherein: the large wave adopts U-shaped ripples.

7. The pipe coupling according to claim 4, wherein: for the inner corrugated pipe, an inner stiffening ring for enhancing the binding effect on the corrugated pipe is arranged at the wave trough between every two adjacent wave crests.

8. The pipe coupling according to claim 7, wherein: the outer corrugated pipe is the corrugated pipe which has the same structure as the inner corrugated pipe but opposite corrugation direction, an external force ring for enhancing the binding effect on the corrugated pipe is arranged at the wave trough between every two adjacent wave crests of the outer corrugated pipe, and a gap for deformation is reserved between the inner corrugated pipe and the outer corrugated pipe.

9. The pipe coupling according to claim 7, wherein: the inner wall of the steel pipe in the upstream direction in front of the double-corrugated sleeve is provided with a guide plate for preventing the corrugated pipe from causing turbulent flow to water flow.