Construction method of offshore photovoltaic suction type steel truss structure

Abstract

The invention relates to a construction method of an offshore photovoltaic suction type steel truss structure. The offshore photovoltaic suction type steel truss structure comprises a suction assembly and a connecting frame assembly. The upper end of the suction assembly is connected with the connecting frame assembly, and the upper end of the connecting frame assembly is connected with a photovoltaic panel; the suction assembly is connected with the seabed; the construction method comprises the steps that S1, the suction assembly and the connecting frame assembly are prefabricated; s2, a suction assembly is installed in a penetrating mode; s3, a connecting frame assembly is installed on the suction assembly; and S4, the suction assembly and the connecting frame assembly are welded, and installation is completed. The construction method of the offshore photovoltaic suction type steel truss structure aims to overcome existing defects, construction is rapid and convenient, and the construction method can adapt to the problems that an offshore covering layer is thin and the bearing capacity is poor.

Description

Technical Field

[0001] The invention relates to a construction method of an offshore photovoltaic suction type steel truss structure. Background Art

[0002] Compared with onshore photovoltaic structures, offshore photovoltaic structures are not only affected by wind loads during construction and operation, but also need to consider the effects of wave and current loads. Compared with onshore photovoltaic support foundations, the dominant load of offshore photovoltaics is transformed into wave and current loads. In addition, at present, domestic pile-based fixed offshore photovoltaics are mainly located on tidal flats or near the coast, with shallow water depths and thin covering layers, and generally have problems such as thin covering layers and poor bearing capacity.

[0003] The traditional photovoltaic support structure adopts a fixed photovoltaic support structure on the upper part and photovoltaic support piles on the lower part. This connection structure is simple and economical for onshore photovoltaics. However, there are the following problems when used at sea: (1) In sea areas with poor surface soil bearing capacity and shallow bedrock, conventional pile foundations need to be embedded in the rock, which is costly and time-consuming. (2) The commonly used fixed photovoltaic support structures on land require a large number of pile foundations, and the cost of offshore pile foundation construction far exceeds that of onshore construction. Traditional support types cannot meet the economic requirements of marine projects. (3) The waves and currents in the marine environment are large, which can easily cause pile foundation deviation problems. At the same time, the soil in the mudflats and offshore areas is relatively soft, and the pile foundation construction process is prone to large vertical displacement deviations, resulting in subsequent inability to install normally.

[0004] Therefore, in response to the above problems, a construction method of an offshore photovoltaic suction steel truss structure is proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the existing defects and provide a construction method for an offshore photovoltaic suction steel truss structure, which is fast and convenient to construct and can adapt to the problems of thin offshore cover and poor bearing capacity.

[0006] The technical solution to achieve the above object is: a construction method of an offshore photovoltaic suction steel truss structure, the offshore photovoltaic suction steel truss structure includes a suction component and a connecting frame component; the upper end of the suction component is connected to the connecting frame component, and the upper end of the connecting frame component is connected to the photovoltaic panel; the suction component is connected to the seabed;

[0007] The suction assembly comprises four suction piles, the four suction piles are connected to the seabed, and the upper ends of the four suction piles are connected to the connecting frame assembly;

[0008] The connecting frame assembly includes four vertical main pipes, and the lower ends of the four vertical main pipes are each connected to one of the suction piles; the four vertical main pipes are each connected by a connecting steel pipe group;

[0009] The photovoltaic panel is connected to the upper steel truss, and the lower end surface of the upper steel truss is connected to four connecting rods, the lower ends of the four connecting rods are insertion sections, and the upper part of the insertion sections is connected to a partition; the insertion sections at the lower ends of the four connecting rods are respectively inserted into the four vertical main conduits;

[0010] Each of the suction piles is connected to a suction pump;

[0011] Construction methods include:

[0012] Step S1, prefabricating a suction assembly and a connecting frame assembly;

[0013] Step S2, sinking and installing the suction component;

[0014] Step S3, installing a connecting frame assembly on the suction assembly;

[0015] Step S4, welding the suction assembly and the connecting frame assembly to complete the installation.

[0016] Preferably, in step S1, prefabricating the suction assembly and the connecting frame assembly comprises:

[0017] Step S11, prefabricating suction piles, vertical main pipes and connecting steel pipes in advance in an onshore factory; connecting the four vertical main pipes through the connecting steel pipe group, and then welding the lower ends of the four vertical main pipes to connect a suction pile respectively;

[0018] Step S12, prefabricate the upper steel truss, connecting rods, partitions and photovoltaic panels in advance in an onshore factory; connect the upper end of the upper steel truss to the photovoltaic panel, weld and connect four connecting rods to the lower end surface of the upper steel truss, connect the partition above the insertion section at the lower end of the connecting rod, and connect a plurality of reinforcing rib plates between the upper end surface of the partition and the connecting rod;

[0019] Step S13, transporting the above welded parts as a whole to the offshore construction site.

[0020] Preferably, the step S2, sinking and installing the suction assembly comprises:

[0021] Step S21, self-weight entry into the mud: This stage is mainly for exhaust and sinking under the action of self-weight. The electric valve of the suction pile is opened to exhaust and sink, and the inclination angle of the frame is closely watched. If the inclination angle is biased to one side, the electric valve of the suction pile on the corresponding side is closed. When all the inclination angles are within the control range, all the electric valves are opened to exhaust and sink synchronously; when the suction pile foundation is lowered to 0.5m from the mud surface, the azimuth and position coordinates of the foundation are adjusted. After meeting the design requirements, it is continued to be lowered to the self-weight entry into the mud. During the process, the angle and horizontality are constantly monitored and adjusted within the design allowable range; until the pile-soil sealing condition for suction sinking is formed (the depth of entry into the mud exceeds 2m);

[0022] Step S22, negative pressure sinking: after the self-sinking into the mud is completed, after checking the position coordinates, direction angle, levelness and mud penetration depth, close the air release valve, start the suction pump system, and start the penetration; the negative pressure cylinder penetrates into the seabed soil under the action of the pressure difference between the inside and outside of the pile top, and the parameters such as levelness, penetration depth, and pressure difference between the inside and outside of the cylinder are monitored and recorded according to the measurement and control equipment during the penetration process;

[0023] Step S23, sinking and penetration are completed: after sinking and penetration to a stable structure, the installation vessel removes the lifting device; after sinking and penetration are in place, the suction pump and umbilical cable are recovered through the front locking hook, and the anchor is raised and the vessel is moved to the next point to repeat the construction;

[0024] Step S24, after the suction piles are sunk into place, there are still some gaps between the seabed and the top plate in the suction piles due to the uneven seabed, inclined seabed, settlement of soil plugs, etc. The seawater in the gaps is replaced by high-pressure grouting to ensure effective contact between the top plate and the seabed.

[0025] Preferably, the step S3 of installing the connecting frame assembly on the suction assembly comprises:

[0026] Step S31, the hoisting components insert the insertion sections at the lower ends of the four connecting rods into the four vertical main conduits respectively. The four insertion sections are 1 long, 2 medium and 1 short. The long insertion section is inserted first for preliminary positioning, and then the medium insertion section is inserted to complete the overall positioning, and finally the short insertion section is inserted to complete the docking.

[0027] Preferably, the step S4, welding the suction assembly and the connecting frame assembly to complete the installation, comprises:

[0028] Step S41, welding the upper port of each vertical main conduit to the partition plate to achieve an overall connection.

[0029] Preferably, the suction pile is an inverted cylindrical structure with a closed upper end and an open lower end.

[0030] The beneficial effects of the present invention are as follows: the construction method of the offshore photovoltaic suction steel truss structure adopts a suction foundation construction that is fast and convenient, and can well adapt to the problems of thin offshore cover and poor bearing capacity; the pile foundations are connected by steel pipes to form a whole and then installed, which avoids the problem of the upper steel truss being unable to be installed smoothly due to the deviation between the pile foundations during construction; at the same time, the upper steel truss is a whole, and the photovoltaic panels can be pre-installed on the steel truss on land, and then hoisted in a unified manner, reducing the offshore construction and installation procedures. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the construction method of the offshore photovoltaic suction steel truss structure of the present invention;

[0032] Figure 2 is a detailed diagram of step S1 of the construction method of the offshore photovoltaic suction steel truss structure of the present invention;

[0033] Figure 3 is a detailed diagram of step S2 of the construction method of the offshore photovoltaic suction steel truss structure of the present invention;

[0034] Figure 4 is a detailed diagram of step S3 of the construction method of the offshore photovoltaic suction steel truss structure of the present invention;

[0035] Figure 5 is a detailed diagram of step S4 of the construction method of the offshore photovoltaic suction steel truss structure of the present invention;

[0036] Figure 6 It is an unconnected axonometric diagram of the offshore photovoltaic suction steel truss structure of the present invention;

[0037] Figure 7 It is a connection axonometric diagram of the offshore photovoltaic suction steel truss structure of the present invention;

[0038] Figure 8 It is an unconnected front view of the offshore photovoltaic suction steel truss structure of the present invention;

[0039] Fig. 9 This is a front view of the connection of the offshore photovoltaic suction steel truss structure of the present invention;

[0040] Fig.10 yes Figure 7 Enlarged view of point A in the middle.

[0041] In the figure: 1. Suction pile; 2. Vertical main conduit; 3. Connecting steel pipe group; 4. Upper steel truss; 5. Connecting rod; 6. Insertion section; 7. Partition; 8. Reinforcement rib plate; 9. Photovoltaic panel. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] like Figure 6-10As shown, a construction method of an offshore photovoltaic suction steel truss structure, the offshore photovoltaic suction steel truss structure includes a suction component and a connecting frame component; the upper end of the suction component is connected to the connecting frame component, and the upper end of the connecting frame component is connected to the photovoltaic panel 9; the suction component is connected to the seabed;

[0045] Specifically, the suction assembly includes four suction piles 1, which are connected to the seabed, and the upper ends of the four suction piles 1 are connected to the connecting frame assembly. Each suction pile 1 is connected to a suction pump. The suction pile 1 is an inverted cylindrical structure, with a closed upper end and an open lower end.

[0046] Specifically, the connecting frame assembly includes four vertical main conduits 2, each of which is connected to a suction pile 1 at its lower end; each of the four vertical main conduits 2 is connected to each other through a connecting steel pipe group 3; and the four vertical main conduits 2 are connected to the connecting steel pipe group 3 by welding. The suction pile 1 is connected to the vertical main conduits 2 by welding.

[0047] Specifically, the photovoltaic panel 9 is connected to the upper steel truss 4, and the lower end surface of the upper steel truss 4 is connected to four connecting rods 5. The lower ends of the four connecting rods 5 are insertion sections 6, and the top of the insertion sections 6 is connected to a partition 7; the insertion sections 6 at the lower ends of the four connecting rods 5 are respectively inserted into four vertical main conduits 2.

[0048] Specifically, the partition plate 7 is connected to the upper end of the vertical main conduit 2 by welding; a plurality of reinforcing rib plates 8 are connected between the upper end surface of the partition plate 7 and the connecting rod 5 .

[0049] Specifically, the suction piles 1, the vertical main conduits 2 and the connecting steel pipe connecting steel pipe group 3 are prefabricated in advance in the onshore factory; the lower ends of the four vertical main conduits 2 are respectively welded to a suction pile 1, and then the four vertical main conduits 2 are respectively connected through the connecting steel pipe group 3; the upper steel trusses 4, the connecting rods 5, the partitions 7 and the photovoltaic panels 9 are prefabricated in advance in the onshore factory; the upper ends of the upper steel trusses 4 are connected to the photovoltaic panels 9, the four connecting rods 5 are welded to the lower end faces of the upper steel trusses 4, the partitions 7 are connected above the insertion sections 6 at the lower ends of the connecting rods 5, and a plurality of reinforcing rib plates 8 are connected between the upper end faces of the partitions 7 and the connecting rods 5; the above welded and connected components are transported as a whole to the offshore construction site. The hoisting components as a whole make the four suction piles 1 sink through, and during the sinking process, the foundation is leveled as a whole by adjusting the suction pump power. The hoisting components insert the insertion sections 6 at the lower ends of the four connecting rods 5 into the four vertical main conduits 2 respectively. The upper end of each vertical main conduit 2 is welded to the partition plate 7 to achieve an integral connection.

[0050] The suction foundation construction adopted in this offshore photovoltaic suction steel truss structure is fast and convenient, and can well adapt to the problems of thin offshore cover and poor bearing capacity; the pile foundations are connected by steel pipes to form a whole before installation, which avoids the problem of the upper steel truss being unable to be installed smoothly due to the deviation between the pile foundations during construction; at the same time, the upper steel truss is a whole, and the photovoltaic panels can be pre-installed on the steel truss on land, and then hoisted in a unified manner, reducing the offshore construction and installation process.

[0051] like Figure 1-5 As shown, the construction method includes:

[0052] Step S1, prefabricating a suction assembly and a connecting frame assembly;

[0053] Step S1, prefabricating the suction assembly and the connecting frame assembly includes:

[0054] Step S11, prefabricate the suction pile 1, the vertical main pipe 2 and the connecting steel pipe group 3 in advance in the onshore factory; connect the four vertical main pipes 2 respectively through the connecting steel pipe group 3, and then weld the lower ends of the four vertical main pipes 2 to each other to connect a suction pile (1);

[0055] Step S12, prefabricate the upper steel truss 4, the connecting rod 5, the partition 7 and the photovoltaic panel 9 in advance in the onshore factory; connect the upper end of the upper steel truss 4 to the photovoltaic panel 9, weld and connect four connecting rods 5 to the lower end surface of the upper steel truss 4, connect the partition 7 above the insertion section 6 at the lower end of the connecting rod 5, and connect a plurality of reinforcing rib plates 8 between the upper end surface of the partition 7 and the connecting rod 5;

[0056] Step S13, transporting the above welded parts as a whole to the offshore construction site.

[0057] Step S2, sinking and installing the suction component;

[0058] Step S2, sinking and installing the suction component includes:

[0059] Step S21, self-weight entry into the mud: This stage is mainly for exhaust and sinking under the action of self-weight. The electric valve of the suction pile is opened to exhaust and sink, and the inclination angle of the frame is closely watched. If the inclination angle is biased to one side, the electric valve of the suction pile on the corresponding side is closed. When all the inclination angles are within the control range, all the electric valves are opened to exhaust and sink synchronously; when the suction pile foundation is lowered to 0.5m from the mud surface, the azimuth and position coordinates of the foundation are adjusted. After meeting the design requirements, it is continued to be lowered to the self-weight entry into the mud. During the process, the angle and horizontality are constantly monitored and adjusted within the design allowable range; until the pile-soil sealing condition for suction sinking is formed (the depth of entry into the mud exceeds 2m);

[0060] Step S22, negative pressure sinking: after the self-sinking into the mud is completed, after checking the position coordinates, direction angle, levelness and mud penetration depth, close the air release valve, start the suction pump system, and start the penetration; the negative pressure cylinder penetrates into the seabed soil under the action of the pressure difference between the inside and outside of the pile top, and the parameters such as levelness, penetration depth, and pressure difference between the inside and outside of the cylinder are monitored and recorded according to the measurement and control equipment during the penetration process;

[0061] Step S23, sinking and penetration are completed: after sinking and penetration to a stable structure, the installation vessel removes the lifting device; after sinking and penetration are in place, the suction pump and umbilical cable are recovered through the front locking hook, and the anchor is raised and the vessel is moved to the next point to repeat the construction;

[0062] Step S24, after the suction piles are sunk into place, there are still some gaps between the seabed and the top plate in the suction piles due to the uneven seabed, inclined seabed, settlement of soil plugs, etc. The seawater in the gaps is replaced by high-pressure grouting to ensure effective contact between the top plate and the seabed.

[0063] Step S3, installing a connecting frame assembly on the suction assembly;

[0064] Step S3, installing the connecting frame assembly on the suction assembly includes:

[0065] Step S31, the hoisting components insert the insertion sections 6 at the lower ends of the four connecting rods 5 into the four vertical main conduits 2 respectively. The four insertion sections 6 are 1 long, 2 medium and 1 short. The long insertion section is inserted first for preliminary positioning, and then the medium insertion section is inserted to complete the overall positioning, and finally the short insertion section is inserted to complete the docking.

[0066] Step S4, welding the suction assembly and the connecting frame assembly to complete the installation.

[0067] Step S4, welding the suction assembly and the connecting frame assembly to complete the installation includes:

[0068] Step S41, welding the upper end of each vertical main conduit 2 to the partition plate 7 to achieve an integral connection.

[0069] The construction method of the offshore photovoltaic suction steel truss structure adopts a suction foundation construction that is fast and convenient, and can well adapt to the problems of thin offshore cover and poor bearing capacity; the pile foundations are connected by steel pipes to form a whole before installation, which avoids the problem of the upper steel truss being unable to be installed smoothly due to the deviation between the pile foundations during construction; at the same time, the upper steel truss is a whole, and the photovoltaic panels can be pre-installed on the steel truss on land, and then hoisted in a unified manner, reducing the offshore construction and installation procedures.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for an offshore photovoltaic suction steel truss structure, the offshore photovoltaic suction steel truss structure comprising a suction component and a connecting frame component; the upper end of the suction component is connected to the connecting frame component, the upper end of the connecting frame component is connected to a photovoltaic panel (9); the suction component is connected to the seabed; The suction assembly comprises four suction piles (1), the four suction piles (1) are connected to the seabed, and the upper ends of the four suction piles (1) are connected to the connecting frame assembly; The connecting frame assembly comprises four vertical main pipes (2), the lower ends of the four vertical main pipes (2) are each connected to one of the suction piles (1); the four vertical main pipes (2) are each connected by a connecting steel pipe group (3); The photovoltaic panel (9) is connected to the upper steel truss (4); the lower end surface of the upper steel truss (4) is connected to four connecting rods (5); the lower ends of the four connecting rods (5) are insertion sections (6); the upper part of the insertion sections (6) is connected to a partition (7); the insertion sections (6) at the lower ends of the four connecting rods (5) are respectively inserted into the four vertical main conduits (2); Each of the suction piles (1) is connected to a suction pump; It is characterized in that Construction methods include: Step S1, prefabricating a suction assembly and a connecting frame assembly; Step S2, sinking and installing the suction component; Step S3, installing a connecting frame assembly on the suction assembly; Step S4, welding the suction assembly and the connecting frame assembly to complete the installation.

2. The construction method of the offshore photovoltaic suction steel truss structure according to claim 1 is characterized in that: The step S1, prefabricating the suction assembly and the connecting frame assembly comprises: Step S11, prefabricating the suction pile (1), the vertical main conduit (2) and the connecting steel pipe connecting steel pipe group (3) in advance in an onshore factory; connecting the four vertical main conduits (2) respectively through the connecting steel pipe group (3), and then welding the lower ends of the four vertical main conduits (2) to connect a suction pile (1); Step S12, prefabricate the upper steel truss (4), the connecting rod (5), the partition (7) and the photovoltaic panel (9) in advance in the onshore factory; connect the upper end of the upper steel truss (4) to the photovoltaic panel (9), weld and connect four connecting rods (5) to the lower end surface of the upper steel truss (4), connect the partition (7) above the insertion section (6) at the lower end of the connecting rod (5), and connect a plurality of reinforcing rib plates (8) between the upper end surface of the partition (7) and the connecting rod (5); Step S13, transporting the above welded parts as a whole to the offshore construction site.

3. The construction method of the offshore photovoltaic suction steel truss structure according to claim 1 is characterized in that: The step S2, sinking and installing the suction component, comprises: Step S21, self-weight entry into the mud: This stage is mainly for exhaust and sinking under the action of self-weight. The electric valve of the suction pile is opened to exhaust and sink, and the inclination angle of the frame is closely watched. If the inclination angle is biased to one side, the electric valve of the suction pile on the corresponding side is closed. When all the inclination angles are within the control range, all the electric valves are opened to exhaust and sink synchronously; when the suction pile foundation is lowered to 0.5m from the mud surface, the azimuth and position coordinates of the foundation are adjusted. After meeting the design requirements, it is continued to be lowered to the self-weight entry into the mud. During the process, the angle and horizontality are constantly monitored and adjusted within the design allowable range; until the pile-soil sealing condition for suction sinking is formed (the depth of entry into the mud exceeds 2m); Step S22, negative pressure sinking: after the self-sinking into the mud is completed, after checking the position coordinates, direction angle, levelness and mud penetration depth, close the air release valve, start the suction pump system, and start the penetration; the negative pressure cylinder penetrates into the seabed soil under the action of the pressure difference between the inside and outside of the pile top, and the parameters such as levelness, penetration depth, and pressure difference between the inside and outside of the cylinder are monitored and recorded according to the measurement and control equipment during the penetration process; Step S23, sinking and penetration are completed: after sinking and penetration to a stable structure, the installation vessel removes the lifting device; after sinking and penetration are in place, the suction pump and umbilical cable are recovered through the front locking hook, and the anchor is raised and the vessel is moved to the next point to repeat the construction; Step S24, after the suction piles are sunk into place, there are still some gaps between the seabed and the top plate in the suction piles due to the uneven seabed, inclined seabed, settlement of soil plugs, etc. The seawater in the gaps is replaced by high-pressure grouting to ensure effective contact between the top plate and the seabed.

4. The construction method of the offshore photovoltaic suction steel truss structure according to claim 1 is characterized in that: The step S3 of installing the connecting frame assembly on the suction assembly comprises: Step S31, the hoisting components insert the insertion sections (6) at the lower ends of the four connecting rods (5) into the four vertical main conduits (2) respectively. The four insertion sections (6) are 1 long, 2 medium and 1 short. The long insertion section is inserted first to perform preliminary positioning, and then the medium insertion section is inserted to complete the overall positioning, and finally the short insertion section is inserted to complete the docking.

5. The construction method of the offshore photovoltaic suction steel truss structure according to claim 1 is characterized in that: The step S4, welding the suction assembly and the connecting frame assembly to complete the installation, comprises: Step S41, welding the upper end of each vertical main conduit (2) to the partition plate (7) to achieve an integral connection.

6. The construction method of the offshore photovoltaic suction steel truss structure according to claim 1 is characterized in that: The suction pile (1) is an inverted cylindrical structure with a closed upper end and an open lower end.

Images