WO2021232478A1

WO2021232478A1 - Underwater closure method for large-diameter hdpe pipeline

Info

Publication number: WO2021232478A1
Application number: PCT/CN2020/093320
Authority: WO
Inventors: 薛林虎; 陈猛; 曾凡; 冯振周; 马亿光明; 董志良; 周杨; 许云飞; 胡汉卿; 刘凯; 甘世行
Original assignee: 中交第四航务工程局有限公司; 中交四航工程研究院有限公司; 中交四航局第二工程有限公司
Priority date: 2020-05-19
Filing date: 2020-05-29
Publication date: 2021-11-25
Also published as: CN111692429A

Abstract

An underwater closure method for a large-diameter HDPE pipeline, comprising: increasing the length of a closure pipe section (100) by utilizing the flexibility of the pipeline; reversely pulling multi-section arcs from a sea-side mounted pipe section (300), and enabling a pipe opening of a butt joint end to be retracted; and converting a straight line into an arc to eliminate an axial error; and performing underwater mounting of the closure pipe section in a plugging mode. The required production cost is small, the operability is high, and the method is suitable for various water depths.

Description

A Method for Underwater Closing of Large Diameter HDPE Pipes

Technical field

The invention relates to the fields of port engineering, traffic engineering, water conservancy engineering, and highway engineering, in particular to a method for underwater closing of a large-diameter HDPE pipeline.

Background technique

High-density polyethylene (hereinafter referred to as HDPE) pipe is a new type of environmentally friendly building material product with long service life, low fluid resistance and strong corrosion resistance. It is widely used in water supply (diversion) systems, drainage systems and gas transportation, etc. Multiple areas.

In the application of HDPE pipelines in the water intake and drainage engineering, the installation of the closure section is the last link of the pipeline construction, and its construction technology and construction quality have a significant impact on the entire project. When the HDPE pipeline is installed to the final closing section, the expansion joint is usually used for the final closing section installation. Because the expansion joint is expensive, it is necessary to develop a construction technology that can replace the expansion joint and realize the final closing section installation, thereby saving project costs ,Improve economic efficiency.

Summary of the invention

In order to solve the problems in the prior art, the present invention provides a method for underwater closing of a large-diameter HDPE pipeline that saves construction costs.

The technical scheme adopted by the present invention is:

An underwater closing method for a large-diameter HDPE pipeline includes closing a pipe section, an installed pipe section on the shore, an installed pipe section on the sea side, and an air bag, which includes the following steps:

S1: Determine the extension length of the closure pipe section according to the actual measured length of the pipeline gap;

S2: After the closure pipe section is shipped to the installation location, it is connected with the installed pipe section on the shore;

S3: Binding airbags on the installed pipe section on the sea side, so that the installed pipe section on the sea side floats to the same height as the closed pipe section;

S4: According to the established chord height, draw multiple arcs in reverse to the floating sea-side installed pipe section, so that the butt end nozzle is retracted, and it is butted with the closed pipe section;

S5: After the docking is completed, the airbag is deflated from the shore side to the sea side, and finally sits on the bottom in a flat arc shape to complete the underwater installation of the closure pipe section.

As an improvement of the technical solution of the present invention, in step S1, the lengthening of the closed pipe section is determined according to the measurement error of the pipe heads at both ends of the monopoly gap, the thermal expansion and contraction amplitude of the pipe, the arc ability of the on-site bending pipe, and the flatness of the base groove. length.

As a further improvement of the technical solution of the present invention, in step S1, the maximum length of the extended length of the closed pipe section is determined by the radius of curvature of the pipe section.

As an improvement of the technical solution of the present invention, in step S2, before docking with the installed pipe section on the shore side, float the butt end of the installed pipe section on the shore side, and dive the closed pipe section to the same height as the installed pipe section on the shore side. Do the docking.

As a further improvement of the technical solution of the present invention, in step S4, the amount of retraction of the butt joint pipe port is realized by pulling multiple arcs, and the radius of curvature of the arc meets the allowable limit.

As a further improvement of the technical solution of the present invention, in step S4, the multi-segment arc is realized by installing a hoist on the ship to tighten the steel wire rope.

As a further improvement of the technical solution of the present invention, the head and tail of the closure pipe section are provided with blind plates, and the blind plates are each 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 placement of the multi-segment arc is measured before the pipe bottoms, and it is confirmed that the maximum chord height meets the lateral allowable deviation.

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

The beneficial effects of the present invention: this method of underwater closure of the large-diameter HDPE pipeline utilizes the flexibility of the pipeline itself, lengthens the length of the closure pipe section, converts a straight line into an arc to eliminate the axial error, and performs underwater installation of the closure pipe section by plugging in. It needs low production cost, high operability, and suitable for a variety of water depths.

Description of the drawings

The present invention will be further explained below in conjunction with the drawings:

Figure 1 is a schematic diagram of pipeline closure according to an embodiment of the present invention;

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

Figure 3 is a schematic diagram of a blind plate according to an embodiment of the present invention;

Fig. 4 is a schematic plan view of an embodiment of the present invention.

Detailed ways

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the manual with graphics, so that people can understand the present invention intuitively and vividly. Each technical feature and overall technical solution of the invention cannot be understood as a limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation description involved, such as up, down, front, back, left, right, etc. indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, but In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of the present invention, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

1 to 4, a large-diameter HDPE pipeline underwater closure method, including the closure of a pipe section 100, a shore-side installed pipe section 200, a sea-side installed pipe section 300, and an airbag 400, which includes the following steps:

S1: Determine the extension length of the closure pipe section 100 according to the actual measured length of the pipeline gap;

S2: After the closing pipe section 100 is shipped to the installation location, it will be connected with the installed pipe section 200 on the shore;

S3: Bind the airbag 400 with the pipe section 300 installed on the sea side, so that the pipe section 300 installed on the sea side floats to the same height of the closed pipe section 100;

S4: According to the predetermined chord height, draw multiple arcs in the opposite direction to the installed pipe section 300 on the floating sea side to retract the butt end nozzle. The amount of butt joint retraction is achieved by pulling the multiple arcs, and the curvature radius of the arc meets Permissible limit, multi-segment arc is realized by the ship 500 setting hoist to tighten the wire rope, and then docking with the closing pipe section 100;

S5: After the docking is completed, deflate the airbag 400 from the shore to the sea, and finally sit on the bottom in a flat arc shape to complete the underwater installation of the closed pipe section 100. The undulating length of the installed pipe section 300 on the sea side is determined according to the number of arcs of the pipe section. The height of the undulation is consistent with the height of the seaside interface of the closure pipe section 100.

Specifically, the extension length of the closed pipe section 100 is determined according to the measurement error of the pipe heads at both ends of the monopoly gap, the thermal expansion and contraction amplitude of the pipeline, the arc ability of the on-site bending pipe, and the flatness of the base groove. The maximum length of the extended length of the closed pipe section 100 is determined by the radius of curvature of the pipe section.

Wherein, the head and tail of the closure pipe section 100 are both provided with blind plates 600, and the blind plates 600 are both provided with a number of water valves 620 and a number of air valves 610.

More specifically, the airbag is tied to the 18m shore-side installed pipe section to make it undulate to a certain height, and the closing pipe section water valve 620, air valve 610 and air bag deflation are opened to descend to the same height as the shore-side installed pipe section. After the docking is completed, the airbag at a certain distance from the shore side interface of the Helong Pipe Section 100 is deflated to the sea side to sink and sit on the bottom. The remaining 100m pipe section is still floating in the water and kept horizontal to prepare for the sea side docking. The 300m to the sea side has installed a pipe section to bind the airbag to the same height of the closed pipe section 100. The length of the undulation is determined according to the number of arc sections of the pipe section and the long-term radius of curvature of the pipe.

After the undulating section of the pipe section is completely suspended in the water, the pipe axis offset is measured by the measuring rod fixed near the bending point of the pipe, and the working boat is guided to adjust the axis of the pipe section to the design position, and the first line at 80m on the shore side of the pipe section Position the wire rope and hang it. During the pipeline axis adjustment process, the barge hoist and the land hoist slowly tighten the wire ropes. After the axis of the undulating section is aligned, the two hoists take up the rope synchronously to draw the arc of the pipe until the measured pole indicates that the arc reaches the design value of 4.54 m, and slightly tighten the limit rope with the reverse pulling force.

During the arc drawing process of the pipe section, measure the position of the measuring rod set on the 80m straight section on the east side of the pipe section, and monitor the retraction of the pipe end on the shore side. When the retraction of the pipe end is slightly greater than the design value of 1.04m, it satisfies the closure of the pipe section. 100 immersion butt joint construction conditions, and then carry out pipe end adjustment, pull-on, bolting and other operations, and carry out the 100 seaside butt joint of the closed pipe section. After the docking is completed, the maximum chord height of the arc position of the pipe section is measured to ensure that the lateral allowable deviation is ±4m, and the air bag is deflated from the shore side to the sea side, and the bottom is seated in a flat arc to complete the sinking.

The invention utilizes the flexibility of the pipeline itself to appropriately lengthen the length of the closure section to make it greater than the actual gap length, and then pull the closure section 100 to the installed pipe section on the sea side to convert the pipe section from a straight line to an arc, and reduce the horizontal error of the pipe section. With a small axial error, the underwater docking of the closure pipe section 100 is completed.

The key point of the “plugging in” process for the underwater installation of the Helong Pipe Section 100 is to reasonably determine the length of the pipe extension under the premise of meeting the requirements of the allowable radius of curvature of the pipe section. For this reason, it is necessary to comprehensively consider the construction error, the effect of thermal expansion and contraction of the pipe, and the flatness of the foundation groove. Under the condition of all uncontrollable factors such as temperature, meet the requirements of the "plug-in" process of the closure section, and complete the underwater installation of the final closure section.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by a person of ordinary skill in the technical field, it is possible to make various changes without departing from the purpose of the present invention. Kind of change.

Claims

A method for underwater closing of a large-diameter HDPE pipeline, which includes closing a pipe section, an installed pipe section on the shore, an installed pipe section on the sea side, and an air bag, and is characterized in that it includes the following steps:

S1: Determine the extension length of the closure pipe section according to the actual measured length of the pipeline gap;

S2: After the closure pipe section is shipped to the installation location, it is connected with the installed pipe section on the shore;

S3: Binding airbags on the installed pipe section on the sea side, so that the installed pipe section on the sea side floats to the same height as the closed pipe section;

S4: According to the established chord height, draw multiple arcs in reverse to the floating sea-side installed pipe section, so that the butt end nozzle is retracted, and it is butted with the closed pipe section;

S5: After the docking is completed, the airbag is deflated from the shore side to the sea side, and finally sits on the bottom in a flat arc shape to complete the underwater installation of the closure pipe section.
The underwater closing method for a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S1, according to the measurement error of the pipe heads at both ends of the monopoly gap, the thermal expansion and contraction range of the pipeline, and the arcing ability of the on-site bending pipeline , The flatness of the base groove determines the lengthening of the closure pipe section.
The underwater closing method for a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S1, the maximum length of the extended length of the closing pipe section is determined by the radius of curvature of the pipe section.
The method for underwater closing of a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S2, before docking with the installed pipe section on the shore side, the docking end of the installed pipe section on the shore side is floated, and the closed pipe section is lowered Dive to the same height as the installed pipe section on the shore for docking.
The method for underwater closing of a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S4, the amount of retraction of the butt joint nozzle is realized by drawing a multi-segment arc, and the radius of curvature of the arc meets the allowable limit.
The underwater closing method for a large-diameter HDPE pipeline according to claim 5, characterized in that: in step S4, the multi-segment arc is realized by installing a hoist on the ship to tighten the steel wire rope.
The method for underwater closing of a large-diameter HDPE pipeline according to claim 1, characterized in that: the head and tail of the closing pipe section are provided with blind plates, and the blind plates are each provided with a number of water valves and a number of air valves .
The method for underwater closing of a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S5, the maximum chord height of the arc placement of multiple arcs is measured before the pipeline sits at the bottom, and it is confirmed that the maximum chord height meets the lateral requirements. Allow deviation.
The method for underwater closing of a large-diameter HDPE pipeline according to claim 1, characterized in that: in step S4, the undulating length of the installed pipe section on the sea side is determined according to the number of arc sections of the pipe section, and the undulating height is the same as the sea side of the closed pipe section. The height of the side interface is the same.