阅读说明：本技术 一种大直径hdpe管道水下合龙方法 (Underwater closure method for large-diameter HDPE (high-density polyethylene) pipeline ) 是由 薛林虎 陈猛 曾凡 冯振周 马亿光明 周杨 许云飞 胡汉卿 刘凯 甘世行 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种大直径HDPE管道水下合龙方法,利用管道自身柔性,加长合龙管段长度,将直线转变为弧线来消除轴向误差,通过塞入方式进行合龙管段水下安装,所需生产成本小,可操作性高、适用多种水深。此发明用于港口工程、交通工程、水利工程、公路工程领域。(The invention discloses an underwater closure method for a large-diameter HDPE pipeline, which utilizes the flexibility of the pipeline, lengthens the length of a closure pipeline section, converts a straight line into an arc line to eliminate axial errors, carries out underwater installation on the closure pipeline section in a plugging mode, and has the advantages of low production cost, high operability and suitability for various water depths. The invention is used in the fields of port engineering, traffic engineering, hydraulic engineering and highway engineering.)

1. The underwater closure method for the large-diameter HDPE pipeline comprises a closure pipeline section, a shore-side installed pipeline section, a sea-side installed pipeline section and an air bag, and is characterized by comprising the following steps of:

s1: determining the lengthening length of the closure pipe section according to the actually measured pipeline gap length;

s2: after the closure pipe section is transported out to an installation position, the closure pipe section is butted with the installed pipe section on the bank side;

s3: binding an air bag on the installed pipe section on the sea side to enable the installed pipe section on the sea side to float to the same height of the closure pipe section;

s4: reversely drawing a multi-section arc to the floating sea side installed pipe section according to the set chord height, retracting the pipe orifice of the butt joint end, and butting with the closure pipe section;

s5: and after the butt joint is finished, the air bag is deflated from the shore side to the sea side, and finally the bottom is set in a plane arc shape, so that the underwater installation of the closure pipe section is finished.

2. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S1, the lengthening length of the closure pipe section is determined according to the pipe head measurement error at the two ends of the ridge break, the pipe expansion and contraction amplitude, the arc making capability of the on-site stretch-bending pipe and the flatness of the base groove.

3. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S1, the maximum length of the lengthened length of the closure pipe section is determined by the curvature radius of the pipe section.

4. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S2, before the pipe section is butted against the shore-side installed pipe section, the butt end of the shore-side installed pipe section is floated, and the closure pipe section is submerged to the same height as the shore-side installed pipe section to be butted.

5. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S4, the amount of retraction of the docking nozzle is achieved by drawing a multi-segment arc, the radius of curvature of which meets the allowable limit.

6. The underwater closure method for large-diameter HDPE pipelines according to claim 5, characterized in that: in step S4, the multi-arc is achieved by setting a winch on the vessel to tighten the wire rope.

7. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: the pipe head and the pipe tail of the pipe closing section are both provided with blind plates, and the blind plates are both provided with a plurality of water valves and a plurality of air valves.

8. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S5, the maximum chord height of the arc positioning of the multi-segment arc is measured before the pipeline is seated, and it is confirmed that the maximum chord height satisfies the lateral allowable deviation.

9. The underwater closure method for large-diameter HDPE pipelines according to claim 1, characterized in that: in step S4, the undulation length of the sea-side installed pipe segment is determined according to the number of arc segments of the pipe segment, and the undulation height is consistent with the sea-side interface height of the closure pipe segment.

Technical Field

The invention relates to the field of port engineering, traffic engineering, hydraulic engineering and highway engineering, in particular to an underwater closure method for a large-diameter HDPE pipeline.

Background

The High Density Polyethylene (HDPE) pipe is a novel green environment-friendly building material product, has the advantages of long service life, small fluid resistance, strong corrosion resistance and the like, and is widely applied to various fields of water supply and drainage systems, water drainage systems, fuel gas conveying and the like.

In the application of the water taking and discharging engineering of the HDPE pipeline, the closure section is installed as the last ring of pipeline construction, and the construction process and the construction quality of the closure section have great influence on the whole project. When the HDPE pipeline is installed to the final closure section, the expansion joint is usually adopted for the final closure section installation, and the expansion joint is expensive, so that a construction process which can replace the expansion joint and realize the final closure section installation is needed to be developed, so that the project cost is saved, and the economic benefit is improved.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the underwater closure method for the large-diameter HDPE pipeline, which saves the construction cost.

The technical scheme adopted by the invention is as follows:

an underwater closure method for a large-diameter HDPE pipeline comprises a closure pipeline section, a shore-side installed pipeline section, a sea-side installed pipeline section and an air bag, and comprises the following steps:

s1: determining the lengthening length of the closure pipe section according to the actually measured pipeline gap length;

s2: after the closure pipe section is transported out to an installation position, the closure pipe section is butted with the installed pipe section on the bank side;

s3: binding an air bag on the installed pipe section on the sea side to enable the installed pipe section on the sea side to float to the same height of the closure pipe section;

s4: reversely drawing a multi-section arc to the floating sea side installed pipe section according to the set chord height, retracting the pipe orifice of the butt joint end, and butting with the closure pipe section;

s5: and after the butt joint is finished, the air bag is deflated from the shore side to the sea side, and finally the bottom is set in a plane arc shape, so that the underwater installation of the closure pipe section is finished.

Further as an improvement of the technical scheme of the invention, in step S1, the lengthened length of the closure pipe section is determined according to the pipe head measurement error at the two ends of the ridge gap, the pipe expansion and contraction amplitude, the arc making capability of the on-site stretch-bending pipe and the flatness of the base groove.

As a further improvement of the technical solution of the present invention, in step S1, the maximum length of the lengthened length of the closure pipe segment is determined by the curvature radius of the pipe segment.

As a further improvement of the technical solution of the present invention, in step S2, before the pipe section is butted against the shore side, the butt end of the shore side installed pipe section is floated, and the closure pipe section is submerged to the same height as the shore side installed pipe section for butt joint.

Further as an improvement of the technical solution of the present invention, in step S4, the retraction amount of the butt pipe orifice is realized by drawing a multi-segment arc, and the curvature radius of the arc satisfies the allowable limit.

As a further improvement of the technical scheme of the invention, in step S4, the multi-segment arc is realized by arranging a winch on the ship to tighten the steel wire rope.

As further improvement of the technical scheme of the invention, the pipe head and the pipe tail of the closure pipe section are provided with blind plates, and the blind plates are provided with a plurality of water valves and a plurality of air valves.

As a further improvement of the technical solution of the present invention, in step S5, the maximum chord height of the arc positioning of the multi-segment arc is measured before the pipeline is seated, and it is confirmed that the maximum chord height satisfies the lateral allowable deviation.

As a further improvement of the technical solution of the present invention, in step S4, the undulation length of the pipe section installed on the sea side is determined according to the number of arc segments of the pipe section, and the undulation height is consistent with the sea side interface height of the closure pipe section.

The invention has the beneficial effects that: according to the underwater closure method for the large-diameter HDPE pipelines, the flexibility of the pipelines is utilized, the length of the closure pipeline sections is lengthened, straight lines are converted into arc lines to eliminate axial errors, the closure pipeline sections are installed underwater in a plugging mode, the required production cost is low, the operability is high, and the underwater closure method is suitable for various water depths.

Drawings

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

FIG. 1 is a schematic view of a pipeline closure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating the plugging principle of the closure pipe section according to the embodiment of the present invention;

FIG. 3 is a schematic view of a blind plate according to an embodiment of the present invention;

fig. 4 is a schematic plan view of a sinking seat bottom according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.