CN111717604A - Method for setting water inlet section of land outbound track of large-diameter ultra-long HDPE pipeline - Google Patents
Method for setting water inlet section of land outbound track of large-diameter ultra-long HDPE pipeline Download PDFInfo
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- CN111717604A CN111717604A CN202010423768.5A CN202010423768A CN111717604A CN 111717604 A CN111717604 A CN 111717604A CN 202010423768 A CN202010423768 A CN 202010423768A CN 111717604 A CN111717604 A CN 111717604A
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- pipeline
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G25/00—Conveyors comprising a cyclically-moving, e.g. reciprocating, carrier or impeller which is disengaged from the load during the return part of its movement
- B65G25/04—Conveyors comprising a cyclically-moving, e.g. reciprocating, carrier or impeller which is disengaged from the load during the return part of its movement the carrier or impeller having identical forward and return paths of movement, e.g. reciprocating conveyors
- B65G25/06—Conveyors comprising a cyclically-moving, e.g. reciprocating, carrier or impeller which is disengaged from the load during the return part of its movement the carrier or impeller having identical forward and return paths of movement, e.g. reciprocating conveyors having carriers, e.g. belts
- B65G25/065—Reciprocating floor conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/02—Articles
- B65G2201/0276—Tubes and pipes
Abstract
The invention discloses a method for setting the water inlet section of a land shipment track of a large-diameter and ultra-long HDPE pipeline, which ensures the safe and efficient shipment of the pipeline, reduces the engineering quantity of a shipment system, is particularly suitable for land shipment work of the large-diameter and ultra-long high-density polyethylene pipeline, and saves time cost and economic cost. The invention is used in the fields of port engineering, traffic engineering and hydraulic engineering.
Description
Technical Field
The invention relates to the fields of port engineering, traffic engineering, hydraulic engineering and the like, in particular to a method for setting a water inlet section of a land outbound track of a large-diameter ultra-long HDPE pipeline.
Background
High-density polyethylene pipes (hereinafter referred to as HDPE pipes) are widely used in various fields such as water supply and drainage systems, fuel gas transportation and the like. The HDPE pipeline needs to be welded on land and transported on land, and after the pipeline section is in transition from the land state to the water state, the procedures of offshore floating transportation, sinking, positioning, even butt joint and the like can be further carried out, so that the pipeline section is installed.
The large-diameter ultra-long HDPE pipe has the characteristic of combining rigidity and flexibility, namely, the flexibility of the pipeline is gradually reflected along with the increase of the length of the pipe, the characteristic puts a high requirement on the synchronization control of the power system and two sides of the pipe section, and particularly the slope ratio design of the water inlet section of the delivery track has great influence. If the slope ratio of adjacent tracks at the water inlet section of the delivery track is changed too much, the pipeline at the water inlet section is not completely floated, the buoyancy force borne by the pipeline is still smaller than the self gravity, so that the pipe head falls down, the pipeline near the slope changing point is suspended and separated from the delivery trolley under the effect of the overhanging of the rigid pipe joint, and the weight of the suspended pipe section is borne by the delivery trolley at the slope changing point, so that the bearing capacity borne by the trolley is greatly increased, and the purchase cost of the trolley is greatly increased; and the adoption of a single track slope or a small-change adjacent track slope ratio means that the construction work amount of the outgoing track is huge, the underwater construction is inconvenient, and the production cost is also increased.
Therefore, the development of a method suitable for arranging the large-diameter ultra-long HDPE pipeline on the land for transporting out and into the water section rail is an urgent technical problem to be solved
Disclosure of Invention
The invention aims to provide a method for setting the water inlet section of a land outbound track of a large-diameter ultra-long HDPE pipeline.
The technical scheme adopted by the invention is as follows:
a method for setting the water inlet section of a land outbound track of a large-diameter ultra-long HDPE pipeline comprises the following steps:
s1: determining the total length of the outgoing track, wherein the length of the water inlet section track is 1/12;
s2: determining the load borne by the pipeline according to the self weight of the pipeline and the load of the accessories, the buoyancy of the water inlet end of the pipeline and the traction force of the front end of the pipeline;
s3: determining dry boundary conditions and wet boundary conditions;
s4: establishing a model, and carrying out stress calculation analysis on the process of pipeline water entering;
s5: and determining the gradient of the outgoing track of the water inlet section according to different slope ratio combinations.
In a further improvement of the technical solution of the present invention, in step S1, the total length of the outbound track is determined according to the maximum length of the single pipe section and the space required for welding the pipeline.
As a further improvement of the technical scheme of the invention, in step S1, the top elevation of the front section of the water inlet section track is lowered from above the water surface to below the water surface through a slope ratio combination with a reduced slope, and the shipping track is transferred to the sea bed surface.
As a further improvement of the technical solution of the present invention, in step S2, both ends of the pipeline are plugged by blind plates, the pipeline is shipped on land in a sealed state, and the pipeline can float on the sea surface before being filled with water.
As a further improvement of the technical solution of the present invention, in step S3, the dry boundary condition is a boundary condition between a lower sliding section of the outbound track and an incoming section of the outbound track, and the pipeline is always in contact with the outbound track.
As a further improvement of the technical solution of the present invention, the wet boundary condition is a boundary condition of a control unit of the pipeline in the process of the pipeline entering water.
As a further improvement of the technical scheme of the invention, in step S4, the stress of the outbound trolley at the variable slope point of the water-entering section track is analyzed and dynamically analyzed as a control working condition, and the stress states of the single-section pipeline and the outbound trolley when the control unit of each single-section pipeline passes over each variable slope point in sequence are obtained, so as to obtain the stress states of the pipeline at each position.
As a further improvement of the technical scheme of the invention, after the front section of the pipeline enters water and floats, when the front section of the pipeline stably floats on the sea surface, the dynamic numerical analysis process is ended.
As a further improvement of the technical solution of the present invention, in step S5, the track slope ratio combination of the water inlet section is determined according to the balance of the load bearing equipment for shipment and the track construction workload.
The invention has the beneficial effects that: the method for setting the water inlet section of the land shipment track of the large-diameter ultra-long HDPE pipeline ensures safe and efficient shipment of the pipeline, reduces the engineering quantity of a shipment system, is particularly suitable for land shipment work of the large-diameter ultra-long high-density polyethylene pipeline, and saves time cost and economic cost.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an overall plan layout of an embodiment of the present invention;
FIG. 2 is a schematic view of a slope point operating condition according to an embodiment of the present invention;
FIG. 3 is a schematic view of a computational model according to an embodiment of the present invention;
fig. 4 is a schematic end view of an exemplary outbound track of an embodiment of the present 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.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1-4, a method for setting the water inlet section of a large-diameter ultra-long HDPE pipe on an outbound track on land comprises the following steps:
s1: the total length of the outbound track 100 is determined according to the site required space and the total weight of the pipeline, and the length of the inbound outbound track 100 is the total length 1/12 of the outbound track 100.
S2: determining the load borne by the pipeline 200 according to the self weight of the pipeline 200 and the load of the fittings, the buoyancy of the water inlet end of the pipeline 200 and the traction force of the front end of the pipeline 200;
s3: determining dry boundary conditions and wet boundary conditions;
s4: establishing a model, and carrying out stress calculation analysis on the process of entering water into the pipeline 200;
s5: and determining the slope of the track at the water inlet section according to different slope ratio combinations.
Specifically, when the outgoing rail 100 is arranged, design parameters of the outgoing rail 100 are determined according to the pipe length, the pipe weight, and the pipe 200 diameter of the pipe 200 to be outgoing. Wherein, the total length of the outbound track 100 is determined by the maximum length of the single pipe section and the space required by the welding of the pipeline 200. Wherein, the horizontal segment 110 is L1 long, the slope segment 120 is L2 long, the total length of the water inlet segment 130 is L3, the top elevation of the front end of the track is reduced from above the water surface to below the water surface through the linear combination of the shipment track 100, and the shipment track 100 is transited to the sea bed surface.
Further, the length of the horizontal section 110 of the outbound track 100 is 5/12 of the total length of the outbound track 100, the slope ratio of the slope section 120 is 1:70, the length of the slope section is 6/12 of the total length of the outbound track 100, the slope ratio of the water entering section 130 is 1:50-1:35-1:25-1:20-1:2, and the length of the slope section is 1/12 of the total length of the outbound track 100, the track is firstly gradually lowered from the water surface to the position below the water surface through four sections of slopes with slow and slow rotation and steep slope, and finally the track is transited to a sea bed surface through a steep slope with the slope ratio of 1: 2.
Large diameter ultra-long HDPE pipes for underwater installation are typically composed of HDPE pipe sections, clump weights 210, and blind plates for plugging the pipe ports. The two ends of the pipeline 200 are plugged by blind plates, the pipeline 200 is transported out on land in a sealed state, and the pipeline 200 can float on the sea surface before being irrigated.
The load applied to the pipe 200 is determined based on the data such as the weight of the pipe 200 and the weight of the fittings. For the slope segment 120, the boundary condition between the slope segment 120 and the water inlet segment 130 needs to be determined. Since the sloped section 120 is a single slope and is a transition section between the horizontal section 110 and the water inlet section 130, the pipe 200 is always in contact with the outbound track 100, i.e., the interaction between the pipe (including the outbound trolley 300) and the track is always present. In accordance with this situation, in the Midas calculation program, the compression-only node elastic support is selected to describe the interaction between the outbound cart 300 and the ramp section 120. The pipeline on the side slope can cause the pipeline on two adjacent sections of variable slopes to be suspended to a certain extent due to the continuous change of the slope of the track and the dominant rigidity of the short pipe joints, namely, the pipeline (including the delivery trolley 300) can interact with the track after the pipeline needs quantitative vertical displacement. To address this problem, pressure-only clearance units and generic bearings are used to describe the interaction between the pipeline and the rails of the entry leg 130 during land shipment.
After the front end of the pipeline 200 enters water, since the buoyancy force borne by the pipeline 200 and the balancing weight 210 is in a nonlinear relation with the water entering depth, in order to accurately simulate the stress change of the pipeline 200 in the water entering process, a finite element thought method is adopted to carry out discretization simulation on the buoyancy force of the pipeline 200 to be transported and the balancing weight 210. Specifically, the length is LHDPETo be dischargedThe duct is divided into Δ L duct control units, with each counterweight 210 area acting as a control unit. As shown in the figure, the buoyancy of each control unit is simulated by using a spring model, the buoyancy at the corresponding draft is input as the spring force into the multi-fold line shape in the Midas software, and the calculation is started after the self weight of the pipeline and the self weight of the counterweight 210 are input.
It should be noted that, in the software multi-fold linear input parameter, when the draft of the pipeline 200 exceeds the diameter of the pipeline 200, it indicates that the pipeline 200 is completely submerged under water, and the spring force should be constant; since the pipeline 200 is continuously transported, when the pipeline and the transportation cart 300 are located at the variable slope point, the pipeline on the track of the partial variable slope section is suspended due to the dominant rigidity of the pipeline, which causes the weight of the pipeline and the counterweight 210 to be concentrated on the adjacent transportation cart 300, and may exceed the bearing capacity of the transportation cart 300, which is the most unfavorable condition.
Therefore, the numerical analysis of the shipping dynamic state of the large-diameter ultra-long HDPE pipes mainly analyzes the stress state of the shipping trolley 300 at the variable slope points, and researches the analysis as a controlled working condition, and the stress states of the pipeline control unit and the shipping trolley 300 when the pipeline control unit with the length of 1 × Δ L, 2 × Δ L, 3 × Δ L … n × Δ L (n ═ LHDPE/Δ L) sequentially crosses each variable slope point need to be analyzed one by one, so as to completely acquire the stress state of the pipeline shipping process at each position. After the pipeline anterior segment entered water and floated, pipeline 200 and balancing weight 210 born buoyancy can be used to resist pipeline partial gravity to reduce the concentrated load of shipment dolly 300, when the pipeline anterior segment steadily floated on the sea, because shipment dolly 300 spent the extreme use state, can end the dynamic numerical analysis process this moment. And analyzing the included angles of other adjacent variable slope sections according to the analysis method to obtain the relationship between the included angles of different adjacent variable slope sections and the maximum stress of the trolley 300, and finally determining the optimal track gradient of the water entering section.
The invention adopts the track water inlet section with the gradient gradually steep, and the elevation of the track top is transited from water to water, thereby not only saving the construction work amount of the track, but also reducing the requirements on the shipping bearing equipment, being particularly suitable for the land shipping work of the large-diameter ultra-long high-density polyethylene pipeline, having high shipping efficiency, low requirements on ship equipment and easy operation.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A method for setting the water inlet section of a land outbound track of a large-diameter ultra-long HDPE pipeline is characterized by comprising the following steps:
s1: determining the total length of the outgoing track, wherein the length of the water inlet section track is 1/12;
s2: determining the load borne by the pipeline according to the self weight of the pipeline and the load of the accessories, the buoyancy of the water inlet end of the pipeline and the traction force of the front end of the pipeline;
s3: determining dry boundary conditions and wet boundary conditions;
s4: establishing a model, and carrying out stress calculation analysis on the process of pipeline water entering;
s5: and determining the gradient of the outgoing track of the water inlet section according to different slope ratio combinations.
2. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S1, the total outbound track length is determined according to the maximum length of the single pipe section and the space required for welding the pipeline.
3. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S1, the water entry section track lowers the elevation of the front section of the water entry section track from the upper end of the water surface to the lower end of the water surface through a slope ratio combination with a reduced slope, and the shipment track is transferred to the surface of the sea bed.
4. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S2, the two ends of the pipeline are plugged by blind plates, the pipeline is shipped on land in a sealed state, and the pipeline can float on the sea surface before being filled with water.
5. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S3, the dry boundary condition is a boundary condition between a lower sliding section of the outbound track and an incoming section of the outbound track, and the pipeline is always in contact with the outbound track.
6. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: the wet boundary condition is a boundary condition of a control unit of the pipeline in the process of entering water into the pipeline.
7. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S4, the stress of the outbound trolley at the variable slope point of the water entry section track is analyzed and dynamically analyzed as a control condition, and the stress states of the single-section pipeline and the outbound trolley when the control unit of each single-section pipeline sequentially passes through the variable slope points are obtained, so as to obtain the stress states of the pipeline at each position.
8. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: and after the front section of the pipeline enters water and floats, finishing the dynamic numerical analysis process when the front section of the pipeline stably floats on the sea.
9. The method for setting the water inlet section of the land outbound track of the large-diameter ultra-long HDPE pipe according to claim 1, wherein: in step S5, the track grade ratio combination of the entry section is determined according to the load bearing equipment for export and track construction work load balance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423768.5A CN111717604B (en) | 2020-05-19 | 2020-05-19 | Method for setting water inlet section of land outbound track of large-diameter ultra-long HDPE pipeline |
| PCT/CN2020/093398 WO2021232483A1 (en) | 2020-05-19 | 2020-05-29 | Method for setting water inflow section of onshore transportation track for large-diameter ultra-long hdpe pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423768.5A CN111717604B (en) | 2020-05-19 | 2020-05-19 | Method for setting water inlet section of land outbound track of large-diameter ultra-long HDPE pipeline |
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| CN111717604A true CN111717604A (en) | 2020-09-29 |
| CN111717604B CN111717604B (en) | 2021-03-26 |
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| CN202010423768.5A Active CN111717604B (en) | 2020-05-19 | 2020-05-19 | Method for setting water inlet section of land outbound track of large-diameter ultra-long HDPE pipeline |
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| WO (1) | WO2021232483A1 (en) |
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- 2020-05-29 WO PCT/CN2020/093398 patent/WO2021232483A1/en active Application Filing
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| CN111717604B (en) | 2021-03-26 |
| WO2021232483A1 (en) | 2021-11-25 |
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