Construction method of HDPE (high-density polyethylene) pipeline shipping track

Abstract

The invention relates to the technical field of HDPE pipeline shipping, in particular to an HDPE pipeline shipping track construction method which comprises the following steps that S1, a site is leveled, and temporary wharfs and temporary cofferdams are pushed and filled; s2, track beam foundation construction is conducted; s31, mounting a horizontal section track beam; s32, pouring a track beam on a land slope section; s33, mounting a water entry section track beam; and S4, installing a winch. By means of the method, the defects that the construction difficulty of the HDPE pipeline shipping track on the seaside is large, and the construction efficiency is low can be well overcome.

Description

Technical Field

[0001] The invention relates to the technical field of HDPE pipeline transportation, and in particular to a HDPE pipeline transportation track construction method. Background Art

[0002] The seawater cooling system is a cooling system that pumps seawater to industrial facilities on land, such as refineries, that require a large amount of heat exchange for heat exchange, and then discharges it back into the ocean. HDPE pipe (High Density Polyethylene) can be used as the seaside water intake pipeline of the seawater cooling system because of its series of excellent properties, such as reliable connection, strong material impact resistance, outstanding cracking resistance, aging resistance and corrosion resistance. However, the installation process of HDPE pipe is complicated and has many steps. First, the welding and assembly of the pipeline are carried out on land to ensure that the connection between the pipeline sections is firm and reliable. After the onshore welding is completed, the assembled pipe sections need to be transported from the land state to the water state, and then further offshore construction can be carried out, including the floating, sinking, positioning and final docking of the pipeline, until the installation of the entire pipeline section is completed.

[0003] At present, the commonly used method of transporting HDPE pipes is to place the HDPE pipes on the transport trolley, and the trolley moves on the transport track to drive the HDPE pipes to move. In this process, it is necessary to ensure the smooth transition of the pipe section to avoid unnecessary damage to the pipe. In order to keep the trolley running smoothly, the construction of the HDPE pipe transport track is the key. Since the HDPE pipe transport track needs to be constructed at the seaside, and the special geological conditions at the seaside (the surface geology is silt sand or clay, which is relatively loose) lead to poor foundation bearing capacity, the track not only needs to support large diameter (inner diameter exceeds 3m) and overweight (pipe section length exceeds 5.5m, linear meter weight exceeds 0.9t / m) HDPE pipes, but also needs to support ballast blocks and transport trolleys. The bearing capacity requirements of the transport track are high, and the slope ratio of the track changes continuously. The transport track is difficult to construct and the construction efficiency is low. It is difficult to balance the relationship between the tight construction period and construction quality. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of great difficulty and low construction efficiency in constructing a HDPE pipeline delivery track at the seaside, and to provide a HDPE pipeline delivery track construction method.

[0005] In a first aspect, the present invention provides a method for constructing a HDPE pipeline delivery track, comprising the following steps:

[0006] S1. Level the site, build temporary docks on both sides of the track beam at the water entry section, and build temporary cofferdams between the two temporary docks;

[0007] S2. Track beam foundation construction: excavate the track beam foundation, and replace the track beam foundation with gravel after compaction. The track beam foundation on land is replaced with 1-1.5m thick stone, and the track beam foundation in the water is replaced in two layers. First, fill in 0.5-0.75m thick gravel, lay a geotextile layer on the filled gravel, and then fill in 0.5-0.75m thick stone;

[0008] S31. Installation of horizontal track beam: The horizontal track beam is spliced ​​by first prefabricated beams;

[0009] S32. Casting of onshore slope track beam: The onshore slope track beam adopts a variable slope ratio setting. First, the steel cage is tied in the foundation trench. After the steel cage is tied, a positioning steel plate is fixed on the top of the steel cage. The slope track is welded on the positioning steel plate. The elevation of the slope track is adjusted based on the elevation of the positioning steel plate. After the track beam template is installed, concrete is cast.

[0010] S33. Installation of water-entering track beam: The water-entering track beam adopts a fixed slope ratio and is formed by splicing the second prefabricated beams;

[0011] S4. Install the winch.

[0012] In the HDPE pipeline delivery track construction method provided by the present invention, both the horizontal track beam and the water entry track beam are prefabricated beams, which can be prefabricated in advance in the factory, reducing the workload of on-site construction and improving construction efficiency; after use, they can be dismantled and reused, saving construction costs;

[0013] Since the onshore slope section track beam adopts a variable slope ratio setting, if prefabricated beams are used, the cost will be too high and the onshore slope section track beam has a high bearing capacity requirement. Cast-in-place track beams have better integrity, more stable structure and better bearing capacity. Since the onshore slope section track beam adopts a variable slope ratio setting, it is more difficult to position the onshore slope section track beam. Therefore, a positioning steel plate is fixed on the top of the steel cage in advance. The positioning steel plate serves as a target object, making it easier to control the slope ratio of the onshore slope section track beam during the later pouring of concrete, ensuring smooth construction of the slope section track and preventing damage to the HDPE pipeline due to uneven tracks;

[0014] Since the foundation of the track beam in the water section is more easily affected by seawater, the foundation stability is worse. This method ensures the stability of the track foundation by replacing gravel and stone in layers. In particular, a geotextile layer is laid in the water section. This geotextile forms an isolation between the gravel and stone, preventing the gravel from sinking or the stone from floating, effectively enhancing the stability and bearing capacity of the track foundation, enabling it to reliably support large-diameter, overweight HDPE pipes and shipping trolleys, and avoiding settlement or deformation of the track under load conditions.

[0015] Preferably, S1 comprises the following steps:

[0016] The onshore track beam is leveled according to the elevation of the horizontal track beam and the onshore slope track beam, and the foundation trench of the onshore track beam is excavated;

[0017] Temporary docks are built on both sides of the track beams at the water entry section, and geotextiles and face stones are laid;

[0018] Starting from the filled temporary wharf, a temporary cofferdam is built between the two temporary wharves. Stone blocks are laid on the outside of the temporary cofferdam for protection, and geotextile is laid on the inside of the temporary cofferdam for slope protection. The temporary cofferdam temporarily encloses the sea side of the track beam entering the water section;

[0019] Dewatering work is carried out in the temporary cofferdam, and after the water level is lowered, the foundation trench excavation of the water-entering section track beam is carried out.

[0020] By setting up temporary docks on both sides of the water-entering track beam, a safe and stable support is provided for the construction of the water-entering track, and the direct impact of waves or tides on the construction area is reduced; the temporary cofferdam is pushed and filled between the two temporary docks, which can effectively prevent seawater intrusion, reduce the impact of waves on the construction site, and provide more stable construction conditions in the water area; dewatering operations are carried out in the cofferdam to ensure that the water level is lowered, which is conducive to foundation trench excavation in a dry environment. This method of controlling the water level not only reduces the difficulty of construction, but also improves the visibility and safety of workers' operations. After the construction of the outbound track is completed, an excavator can be arranged to remove the temporary cofferdam and recover the blocks; the temporary dock can be used as a shipping site for subsequent construction ships to dock and other structural construction, saving operating costs and reducing demolition costs.

[0021] Preferably, after the track beam foundation is excavated in S2, the track beam foundation is compacted and a compaction test is performed, and the compaction degree of the track beam foundation is 85%-90%.

[0022] The compaction degree of the track beam foundation is required to reach 85%-90% and tests are carried out to ensure that the foundation compaction meets the design requirements, which helps to maintain the uniformity and density of the foundation and reduce the risk of uneven settlement that may occur in the future.

[0023] Preferably, the specification of the stone in S2 is 60-300KG stone, and the specification of the crushed stone is 1-8 inch crushed stone.

[0024] This graded material selection method can ensure that the foundation materials at different levels have sufficient bearing capacity and can fill small gaps well to reduce the risk of sinking.

[0025] Preferably, S31 includes the following steps:

[0026] The first prefabricated beam comprises a first foundation and a first track fixedly connected to the top of the first foundation, one end of the first foundation is set as a first tongue and groove, the other end of the first foundation is set as a second tongue and groove, and the first tongue and groove and the second tongue and groove are both set with a first steel plate;

[0027] Connecting two adjacent sections of the first foundation tongue and groove, and welding the first force-transmitting steel bars to the first steel plates adjacent to the first tongue and groove and the second tongue and groove;

[0028] The first prefabricated beams are sequentially spliced ​​to form horizontal section track beams.

[0029] The adjacent first foundations are connected by tongue and groove, so that the two adjacent first foundations fit tightly together to form a firm and continuous connection. This method is more stable than the traditional simple splicing, effectively reducing the looseness and displacement between the first prefabricated beams, thereby improving the overall bearing capacity and anti-deformation performance of the track beam structure, and ensuring the safety and stability of the horizontal track beam.

[0030] Preferably, a first embedded steel plate is fixedly installed on the top of the first foundation, and the first rail is fixedly connected to the first foundation through the first embedded steel plate.

[0031] The first embedded steel plate can facilitate welding of the first rail to the first embedded steel plate; the embedded first embedded steel plate facilitates alignment during the later assembly of the first prefabricated beam, and can ensure the accurate installation position of the first rail, thereby reducing the alignment error during the later installation.

[0032] Preferably, S33 includes the following steps:

[0033] The second prefabricated beam comprises a second foundation and a second track fixedly connected to the top of the second foundation, one end of the second foundation is set as a third tongue and groove, the other end of the second foundation is set as a fourth tongue and groove, and the third tongue and groove and the fourth tongue and groove are both set with a second steel plate;

[0034] Connecting two adjacent sections of the second foundation tongue and groove, and welding the second force-transmitting steel bars to the second steel plates adjacent to the third tongue and groove and the fourth tongue and groove;

[0035] A second embedded steel plate is fixedly installed on the top of the second foundation, and the second rail is fixedly connected to the second foundation through the second embedded steel plate;

[0036] The second prefabricated beams are sequentially spliced ​​to form the water entry section track beam.

[0037] The adjacent second foundations are connected by tongue and groove, so that the two adjacent second foundations fit tightly together to form a firm and continuous connection. This method is more stable than the traditional simple splicing, effectively reducing the looseness and displacement between the second prefabricated beams, thereby improving the overall bearing capacity and anti-deformation performance of the track beam structure, ensuring the safety and stability of the track beam in the water section; the second embedded steel plate can facilitate the welding of the second track with the second embedded steel plate; the embedded second embedded steel plate plays a role in facilitating alignment when assembling the second prefabricated beam in the later stage, which can ensure that the slope ratio of the second track is always fixed, thereby reducing the alignment error during the later installation.

[0038] Preferably, the second prefabricated beam further comprises a C-shaped steel plate and a connection system, the second foundation pre-buries the C-shaped steel plate, the connection system is used to connect the second foundations arranged side by side, and the connection system is connected to the second foundation via the C-shaped steel plate.

[0039] The two submerged track beams are arranged side by side to support the transport trolley. Since the underwater part is subject to lateral loads caused by wind and waves, a connection system is added between the second foundations arranged side by side underwater to enhance the lateral stiffness of the track beam structure, effectively preventing lateral displacement or shaking of the foundation caused by wind and waves or fluid impact underwater, thereby ensuring the stability of the track system in the marine environment.

[0040] Preferably, S4 comprises the following steps:

[0041] S41. Pre-buried anchor blocks as the foundation of the winch;

[0042] S42. An anchor plate is fixedly installed on the top of the anchor block as the base platform of the winch, and an anchor round steel is welded on the anchor plate;

[0043] S43. According to the installation position of the winch, construct the winch pad on one side of the anchor block, then install the winch on the winch pad and ensure that the winch is connected to the anchor round steel.

[0044] By pre-embedding anchor blocks in the foundation to provide a stable basic support for the winch, the tension and impact force generated during the operation of the winch can be effectively dispersed; installing anchor steel plates on the top of the anchor blocks and welding anchor round steels can tightly connect the winch base platform with the anchor structure, which helps to resist the high-load tension during winch operation; pre-constructing a cushion layer according to the position of the winch can provide a stable and firm installation platform for the winch, making the installation process more convenient.

[0045] Preferably, the slope ratio of the track beam in the water entry section is greater than the slope ratio of the track beam in the adjacent onshore slope section.

[0046] The slope ratio of the water-entering section track beam is set to be greater than the slope ratio of the adjacent onshore slope section track beam, that is, the slope of the water-entering section track beam is steeper than the nearest onshore slope section track beam, which can reduce the difficulty of prefabricating the second prefabricated beam and save construction costs.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1. The HDPE pipeline delivery track construction method provided by the present invention has the horizontal track beam and the water entry track beam as prefabricated beams, which can be prefabricated in advance in the factory, reducing the workload of on-site construction and improving the construction efficiency; after use, they can be dismantled and reused, saving construction costs;

[0049] 2. The HDPE pipeline delivery track construction method provided by the present invention adopts a variable slope ratio setting for the onshore slope section track beam. If prefabricated beams are used, the cost will be too high and the onshore slope section track beam has a high bearing capacity requirement. Cast-in-place track beams have better integrity, more stable structure and better bearing capacity. Since the onshore slope section track beam adopts a variable slope ratio setting, it is more difficult to position the onshore slope section track beam. Therefore, a positioning steel plate is fixed in advance on the top of the steel cage. The positioning steel plate serves as a target object. It is easier to control the slope ratio of the onshore slope section track beam during the later pouring of concrete, ensuring smooth construction of the slope section track and preventing damage to the HDPE pipeline due to uneven tracks.

[0050] 3. The HDPE pipeline delivery track construction method provided by the present invention ensures the stability of the track foundation by replacing gravel and stone in layers. In particular, a geotextile layer is laid in the water entry section, which forms an isolation between the gravel and the stone, avoiding the sinking of the gravel or the floating of the stone, effectively enhancing the stability and bearing capacity of the track foundation, enabling it to reliably support large-diameter, overweight HDPE pipelines and delivery trolleys, and avoiding the settlement or deformation of the track under load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is the relationship diagram between the temporary wharf and the temporary cofferdam;

[0052] Figure 2 This is a schematic diagram of the HDPE pipe shipping track;

[0053] Figure 3 is a schematic diagram of the cross section of the first precast beam;

[0054] Figure 4 This is the first basic assembly diagram;

[0055] Figure 5 This is a schematic diagram of the cross section of the track beam in the onshore slope section;

[0056] Figure 6 is a schematic diagram of the cross section of the second precast beam;

[0057] Figure 7 This is the second basic assembly diagram;

[0058] Figure 8 A schematic diagram of a second foundation for connecting two side-by-side arrangements of the connection system;

[0059] Fig. 9 Section 1 is the connection between the connection system and the C-shaped steel plate;

[0060] Fig.10 Section 2 is the connection between the connection system and the C-shaped steel plate;

[0061] Fig.11 It is a schematic diagram of the cross section of the anchor block;

[0062] Fig.12 Schematic diagram of laying winch pad.

[0063] Markings in the figure:

[0064] 1-horizontal track beam, 11-first precast beam, 111-first foundation, 1111-first tongue, 1112-second tongue, 112-first track, 113-first steel plate, 114-first force transmission steel bar, 115-first embedded steel plate, 2-onshore slope track beam, 21-steel cage, 22-positioning steel plate, 23-slope track, 3-water entry track beam, 31-second precast beam, 311-second foundation, 3111- The third tongue and groove, 3112-the fourth tongue and groove, 312-the second track, 313-the second steel plate, 314-the second force-transmitting steel bar, 315-the second embedded steel plate, 316-the C-shaped steel plate, 317-the connecting system, 4-the winch, 5-the anchor block, 51-the anchoring steel plate, 52-the anchoring round steel, 53-the I-beam, 6-the winch cushion, 101-the temporary wharf, 102-the temporary cofferdam, 201-the stone, 202-the crushed stone, 203-the geotextile layer. DETAILED DESCRIPTION

[0065] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0066] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0067] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0068] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0069] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0070] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0071] Example 1

[0072] This embodiment provides a method for constructing a HDPE pipeline delivery track, which is used to construct a HDPE pipeline delivery track at the seaside, and includes the following steps:

[0073] S1. Level the site, push and fill temporary docks 101 on both sides of the water section track beam 3, and push and fill temporary cofferdams 102 between the two temporary docks 101;

[0074] Specifically, Figure 1 As shown, S1 includes the following steps:

[0075] The onshore track beam can be leveled according to the elevations of the horizontal track beam 1 and the onshore slope track beam 2, and the foundation trench of the onshore track beam can be excavated;

[0076] Use earth-moving equipment to push and fill temporary docks 101 on the north and south sides of the water-entering track beam 3, lay geotextiles, and use excavators to lay face stones;

[0077] The excavator starts from the filled temporary wharf 101 and fills the temporary cofferdam 102 between the two temporary wharves 101. The top width of the temporary cofferdam 102 can be about 10m. Stone blocks are laid on the outside of the temporary cofferdam 102 for protection, and geotextile is laid on the inside of the temporary cofferdam 102 for slope protection. The temporary cofferdam 102 temporarily encloses the sea side of the water-entering track beam 3.

[0078] A water pump is arranged in the temporary cofferdam 102 to carry out the dewatering work. After the water level is lowered, an excavator can be arranged to carry out the foundation trench excavation and slope repair work of the water-entering section track beam 3.

[0079] By setting up temporary docks 101 on both sides of the water section track beam 3, a safe and stable support is provided for the construction of the water section track, and the direct impact of waves or tides on the construction area is reduced; the temporary cofferdam 102 is pushed and filled between the two temporary docks 101, which can effectively prevent seawater intrusion, reduce the impact of waves on the construction site, and provide more stable construction conditions in the water area; dewatering operations are carried out in the cofferdam to ensure that the water level is lowered, which is conducive to foundation trench excavation in a dry environment. This method of controlling the water level not only reduces the difficulty of construction, but also improves the visibility and safety of workers' operations. After the construction of the shipping track is completed, an excavator can be arranged to remove the temporary cofferdam 102 and recover the blocks; the temporary dock 101 can be used as a shipping site for subsequent construction ships to dock and other structural construction, saving operating costs and reducing demolition costs.

[0080] S2. Track beam foundation construction: You can use an excavator to excavate the track beam foundation. You need to pay attention to the section width control during the excavation process to avoid excessive stone when backfilling. After the track beam foundation is excavated, the track beam foundation is watered and compacted with a small roller, and a compaction test is performed. The compaction degree of the track beam foundation can be 85%-90% to ensure that the foundation compaction meets the design requirements, which helps to maintain the uniformity and density of the foundation and reduce the risk of uneven settlement that may occur in the future.

[0081] After the track beam foundation is compacted, the track beam foundation is replaced with crushed stone. Figure 2 As shown, the foundation of the onshore track beam (horizontal track beam 1 + onshore slope track beam 2) is replaced with 1-1.5m thick stone 201, and specifically, stones with a specification of 60-300KG can be used; the foundation of the water-entering track beam 3 is replaced in two layers, and 0.5-0.75m thick crushed stone 202 can be filled in first, and specifically, crushed stone with a specification of 1-8 inches can be used; a geotextile layer 203 is laid on the filled crushed stone 202, and then 0.5-0.75m thick stone 201 is filled in.

[0082] S31. Figure 2 , Figure 3 , Figure 4 As shown, the horizontal track beam 1 is installed: the horizontal track beam 1 is formed by splicing the first prefabricated beam 11;

[0083] Specifically, S31 includes the following steps:

[0084] The first prefabricated beam 11 includes a first base 111 and a first track 112 fixedly connected to the top of the first base 111. One end of the first base 111 is provided with a first groove 1111, and the other end of the first base 111 is provided with a second groove 1112. The first groove 1111 and the second groove 1112 are both provided with a first steel plate 113.

[0085] The two adjacent first foundations 111 are connected by tongue and groove, and the first steel plates 113 adjacent to the first tongue and groove 1111 and the second tongue and groove 1112 are welded with the first force transmission steel bars 114; Figure 4 For example, Figure 4 The first force transmission steel bars 114 are welded at the tongue-and-groove joints of the two first foundations 111 .

[0086] Furthermore, a first embedded steel plate 115 is fixedly installed on the top of the first foundation 111 , and the first rail 112 is fixedly connected to the first foundation 111 via the first embedded steel plate 115 .

[0087] by Figure 4 For example, Figure 4The same first base 111 has a first groove 1111 on the left side, and the first groove 1111 is aligned with the top of the first base 111; the same first base 111 has a second groove 1112 on the right side, and the second groove 1112 is aligned with the bottom of the first base 111. Figure 4 When the left and right first foundations 111 are connected, the second tongue 1112 of the left first foundation 111 is tongue-and-groove connected with the first tongue 1111 of the right first foundation 111. The first prefabricated beams 11 are sequentially spliced ​​to form a horizontal track beam 1.

[0088] The adjacent first foundations 111 are connected by tongue and groove, so that the two adjacent first foundations 111 fit tightly together to form a firm and continuous connection. This method is more stable than the traditional simple splicing, and effectively reduces the looseness and displacement between the first precast beams 11, thereby improving the overall bearing capacity and anti-deformation performance of the track beam structure, and ensuring the safety and stability of the horizontal section track beam 1. The first embedded steel plate 115 can facilitate the welding of the first track 112 and the first embedded steel plate 115; the embedded first embedded steel plate 115 plays a role in facilitating alignment when the first precast beam 11 is assembled later, and can ensure the accurate installation position of the first track 112, thereby reducing the alignment error during the later installation.

[0089] S32. Casting of the onshore slope track beam 2: The onshore slope track beam 2 adopts a variable slope ratio setting, for example Figure 2 As shown in Figure 1, the slope ratio can be gradually changed from 1:100 to 1:15.5. Figure 5 As shown, the cross section of the onshore slope track beam 2 is similar to the cross section of the first precast beam 11. The steel cage 21 can be first tied in the foundation trench, and after the steel cage 21 is tied, the positioning steel plate 22 is fixed on the top of the steel cage 21, and the slope track 23 is welded on the positioning steel plate 22. The elevation of the slope track 23 is adjusted with the elevation of the positioning steel plate 22 as a reference, and the concrete is poured after the track beam template is installed;

[0090] S33. Figure 2 , Figure 6 , Figure 7 As shown, the water section track beam 3 is installed: the water section track beam 3 is set with a fixed slope ratio. Specifically, the slope ratio of the water section track beam 3 is greater than the slope ratio of the adjacent onshore slope section track beam 2. Figure 2 For example, the slope ratio of the water section track beam 3 can be 1:14.5, and the slope ratio of the onshore slope section track beam 2 adjacent to the water section track beam 3 is 1:15.5; the water section track beam 3 is spliced ​​by the second prefabricated beam 31.

[0091] Specifically, S33 includes the following steps:

[0092] The second prefabricated beam 31 includes a second base 311 and a second track 312 fixedly connected to the top of the second base 311, one end of the second base 311 is set as a third groove 3111, the other end of the second base 311 is set as a fourth groove 3112, and the third groove 3111 and the fourth groove 3112 are both set with a second steel plate 313;

[0093] The two adjacent sections of the second foundation 311 are connected by tongue and groove, and the second steel plates 313 adjacent to the third tongue and groove 3111 and the fourth tongue and groove 3112 are welded with the second force transmission steel bars 314;

[0094] A second embedded steel plate 315 is fixedly installed on the top of the second foundation 311, and the second track 312 is fixedly connected to the second foundation 311 through the second embedded steel plate 315;

[0095] The second prefabricated beams 31 are sequentially spliced ​​to form the water entry section track beam 3 .

[0096] The adjacent second foundations 311 are connected by tongue and groove, so that the two adjacent second foundations 311 fit tightly together to form a firm and continuous connection. This method is more stable than the traditional simple splicing, and effectively reduces the looseness and displacement between the second prefabricated beams 31, thereby improving the overall bearing capacity and anti-deformation performance of the track beam structure, and ensuring the safety and stability of the track beam 3 in the water section; the second embedded steel plate 315 can facilitate the welding of the second track 312 with the second embedded steel plate 315; the embedded second embedded steel plate 315 plays a role in facilitating alignment when the second prefabricated beam 31 is assembled later, and can ensure that the slope ratio of the second track 312 is always fixed, thereby reducing the alignment error during the later installation.

[0097] Furthermore, in order to improve the underwater stability of the water-entering track beam 3, Figure 8 , Fig. 9 , Fig.10 As shown, it can be understood that the delivery tracks constructed by the HDPE pipeline delivery track construction method provided in this embodiment are arranged side by side to form a route for the delivery trolley to run (the wheels of the delivery trolley run smoothly in the first track 112, the slope section track 23 and the second track 312 arranged side by side, respectively). Therefore, the second prefabricated beam 31 also includes a C-shaped steel plate 316 and a connecting system 317. The second foundation 311 is pre-embedded with the C-shaped steel plate 316. The connecting system 317 is used to connect the second foundation 311 arranged side by side. The connecting system 317 is connected to the second foundation 311 through the C-shaped steel plate 316. Fig.10 As shown, the connection system 317 may use a double I-beam tie beam.

[0098] Two submerged track beams 3 are arranged side by side to support the transport trolley. Since the underwater part is subject to lateral loads caused by wind and waves, a connection system 317 is added between the second foundations 311 arranged side by side underwater to enhance the lateral stiffness of the track beam structure, effectively prevent lateral displacement or shaking of the foundation caused by wind and waves or fluid impact underwater, and ensure the stability of the track system in the marine environment.

[0099] S4. Install the hoist 4. In this embodiment, a 15T hoist can be used. The hoist 4 can be set on a crossbeam connected to the delivery track beam to ensure the stability of the hoist 4. Specifically, three groups of hoists 4 can be symmetrically set on both sides of each delivery track.

[0100] Further, such as Fig.11 , Fig.12 As shown, S4 includes the following steps:

[0101] S41. The pre-buried anchor block 5 is used as the foundation of the winch 4. The size of the anchor block 5 in this embodiment is 3m long * 1.9m wide * 1.7m high. According to the measured placement point position, an excavator is used to excavate on the original soil base surface to form a small foundation pit of 3.8m long * 3m wide * 1.7m high. After the excavation is completed, a small roller is used to spray water and compact the bottom, and Fig.12 As shown, two anchor blocks 5 are placed vertically. After the anchor blocks 5 are pre-buried, the gaps around the foundation pit are backfilled, and water is sprayed and compacted at the corresponding positions;

[0102] S42. Anchor steel plate 51 is fixedly installed on the top of anchor block 5 as the base platform of winch 4. In this embodiment, the thickness of anchor steel plate 51 is 2CM, and the same size position can be cut out by wind welding at the hanging point position of anchor block 5. Insert 20# I-beam 53 vertically into the cut hanging point position, and perform concrete grouting. After the concrete solidifies, fully weld the pre-buried I-beam 53 and anchor steel plate 51 to play a role in fastening between anchor steel plate 51 and pre-buried anchor block 5;

[0103] Afterwards, the anchoring round steel 52 is welded on the anchoring steel plate 51. In this embodiment, the diameter of the anchoring round steel 52 is 100 mm. After the welding of the anchoring round steel 52 is completed, diagonal braces can be welded around it.

[0104] S43. After the construction of the anchor block 5 is completed, a winch pad 6 is constructed on one side of the anchor block 5 according to the installation position of the winch 4. For example, a 10 cm deep excavation with a size of 2m*3m can be carried out in front of the anchor block 5. After compacting the soil foundation, a layer of C20 concrete pad with a thickness of 10 cm is laid. Then, the winch 4 is installed on the winch pad 6 and ensure that the winch 4 is connected to the anchor round steel 52.

[0105] By pre-embedding anchor blocks 5 in the foundation to provide a stable basic support for the winch 4, the tension and impact force generated when the winch 4 is running can be effectively dispersed; installing an anchor steel plate 51 on the top of the anchor block 5 and welding an anchor round steel 52, the base platform of the winch 4 is tightly connected to the anchor structure, which helps to resist the high-load tension when the winch 4 is in operation; pre-constructing a cushion layer according to the position of the winch 4 can provide a stable and firm installation platform for the winch 4, making the installation process more convenient.

[0106] In the HDPE pipeline delivery track construction method provided in this embodiment, the horizontal section track beam 1 and the water entry section track beam 3 are both prefabricated beams, which can be prefabricated in advance in the factory, reducing the workload of on-site construction and improving construction efficiency; after use, they can be dismantled and reused, saving construction costs.

[0107] Since the onshore slope section track beam 2 adopts a variable slope ratio setting, if a prefabricated beam is used, the cost will be too high and the onshore slope section track beam 2 has a high bearing capacity requirement. The cast-in-place track beam has better integrity, a more stable structure and better bearing capacity. Since the onshore slope section track beam 2 adopts a variable slope ratio setting, it is difficult to position the onshore slope section track beam 2. Therefore, a positioning steel plate 22 is fixed in advance on the top of the steel cage 21. The positioning steel plate 22 serves as a target object. It is easier to control the slope ratio of the onshore slope section track beam 2 when pouring concrete in the later stage, ensuring smooth construction of the slope section track 23 and preventing damage to the HDPE pipeline due to uneven tracks.

[0108] Since the foundation of the track beam 3 in the water entry section is more easily affected by seawater, the foundation stability is worse. This method ensures the stability of the track foundation by replacing the gravel 202 and the stone 201 in layers. In particular, a geotextile layer 203 is also laid in the water entry section. This geotextile forms an isolation between the gravel 202 and the stone 201, avoiding the sinking of the gravel 202 or the floating of the stone 201, effectively enhancing the stability and bearing capacity of the track foundation, enabling it to reliably support the weight of large-diameter, overweight HDPE pipes, ballast blocks and shipping carts, and avoiding the settlement or deformation of the track under heavy load conditions.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a HDPE pipeline delivery track, characterized in that: The following steps are involved: S1. Level the site, push and fill temporary docks (101) on both sides of the water section track beam (3), and push and fill temporary cofferdams (102) between the two temporary docks (101); S2. Track beam foundation construction: excavate the track beam foundation, and replace the track beam foundation with gravel after compaction. The track beam foundation on land is replaced with 1-1.5m thick stone (201), and the track beam foundation in the water section (3) is replaced in two layers. First, fill in 0.5-0.75m thick gravel (202), lay a geotextile layer (203) on the filled gravel (202), and then fill in 0.5-0.75m thick stone (201); S31. Horizontal track beam (1) installation: The horizontal track beam (1) is spliced ​​by a first prefabricated beam (11); S32. Casting of the onshore slope track beam (2): The onshore slope track beam (2) is set with a variable slope ratio. First, a steel cage (21) is tied in the base trench. After the steel cage (21) is tied, a positioning steel plate (22) is fixed on the top of the steel cage (21). The slope track (23) is welded on the positioning steel plate (22). The elevation of the slope track (23) is adjusted with the elevation of the positioning steel plate (22) as a reference. After the track beam template is installed, concrete is poured; S33. Installation of the water section track beam (3): The water section track beam (3) is set with a fixed slope ratio, and the water section track beam (3) is spliced ​​with a second prefabricated beam (31); S4. Install the winch (4).

2. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: S1 includes the following steps: The onshore track beam is leveled according to the elevations of the horizontal track beam (1) and the onshore slope track beam (2), and a foundation trench for the onshore track beam is excavated; A temporary wharf (101) is pushed and filled on both sides of the water-entering track beam (3), and geotextile is laid and face stones are laid; Starting from the filled temporary wharf (101), a temporary cofferdam (102) is filled between the two temporary wharves (101), stones are laid on the outer side of the temporary cofferdam (102) for protection, and geotextile is laid on the inner side of the temporary cofferdam (102) for slope protection. The temporary cofferdam (102) temporarily encloses the sea side of the water-entering section track beam (3); The water level is lowered in the temporary cofferdam (102), and after the water level is lowered, the foundation trench of the water-entering section track beam (3) is excavated.

3. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: After the track beam foundation is excavated in S2, the track beam foundation is compacted and a compaction test is performed. The compaction degree of the track beam foundation is 85%-90%.

4. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: The specifications of the stone (201) in S2 are 60-300KG stone; the specifications of the crushed stone (202) are 1-8 inch crushed stone.

5. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: S31 includes the following steps: The first prefabricated beam (11) comprises a first foundation (111) and a first track (112) fixedly connected to the top of the first foundation (111), one end of the first foundation (111) is arranged as a first tongue and groove (1111), the other end of the first foundation (111) is arranged as a second tongue and groove (1112), and the first tongue and groove (1111) and the second tongue and groove (1112) are both provided with a first steel plate (113); Connecting two adjacent sections of the first foundation (111) by tongue and groove, and welding first force transmission steel bars (114) to the first steel plates (113) adjacent to the first tongue and groove (1111) and the second tongue and groove (1112); The first prefabricated beams (11) are sequentially spliced ​​to form a horizontal section track beam (1).

6. A method for constructing a HDPE pipeline delivery track according to claim 5, characterized in that: A first embedded steel plate (115) is fixedly installed on the top of the first foundation (111), and the first track (112) is fixedly connected to the first foundation (111) via the first embedded steel plate (115).

7. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: S33 includes the following steps: The second prefabricated beam (31) comprises a second foundation (311) and a second track (312) fixedly connected to the top of the second foundation (311), one end of the second foundation (311) is arranged as a third tongue and groove (3111), the other end of the second foundation (311) is arranged as a fourth tongue and groove (3112), and the third tongue and groove (3111) and the fourth tongue and groove (3112) are both arranged with a second steel plate (313); Connecting two adjacent sections of the second foundation (311) by tongue and groove, and welding the second force transmission steel bars (314) to the second steel plates (313) adjacent to the third tongue and groove (3111) and the fourth tongue and groove (3112); A second embedded steel plate (315) is fixedly installed on the top of the second foundation (311), and the second track (312) is fixedly connected to the second foundation (311) via the second embedded steel plate (315); The second prefabricated beams (31) are spliced ​​in sequence to form the water entry section track beam (3).

8. A method for constructing a HDPE pipeline delivery track according to claim 7, characterized in that: The second prefabricated beam (31) further comprises a C-shaped steel plate (316) and a connection system (317); the second foundation (311) is pre-buried with the C-shaped steel plate (316); the connection system (317) is used to connect the second foundations (311) arranged side by side; the connection system (317) is connected to the second foundation (311) via the C-shaped steel plate (316).

9. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: S4 includes the following steps: S41. Embedded anchor block (5) as the basis of the winch (4); S42. An anchor plate (51) is fixedly installed on the top of the anchor block (5) as the base platform of the winch (4), and an anchor round steel (52) is welded on the anchor plate (51); S43. According to the installation position of the winch (4), a winch pad (6) is constructed on one side of the anchor block (5), and then the winch (4) is installed on the winch pad (6) and the winch (4) is ensured to be connected to the anchor round steel (52).

10. A method for constructing a HDPE pipeline delivery track according to claim 1, characterized in that: The slope ratio of the water-entering section track beam (3) is greater than the slope ratio of the adjacent onshore slope section track beam (2).

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