Offshore assembled foundation system and construction method thereof

Abstract

The present invention relates to the technical field of assembled bridges, and provides an offshore assembled pedestal system and a construction method thereof. The offshore assembled pedestal system comprises: a pedestal body, a connecting steel bar is arranged on the top surface, a plurality of pile holes are arranged on the bottom surface, a steel cage is arranged in the pile holes, and a slurry outlet channel is arranged on the side wall of the pile holes through the pedestal body; a steel pipe pile is arranged corresponding to the pile hole and can be inserted in the pile hole, a steel plate is arranged on the outer wall of the steel pipe pile, the steel plate can be supported on the outer edge of the pile hole and block the gap between the steel pipe pile and the pile hole; a leveling device comprises a plurality of leveling parts, all of which are arranged on the steel plate; a guide device is arranged on the side ends of the pedestal body and the steel pipe pile, and can guide the pedestal body when the pedestal body and the steel pipe pile are assembled. The present invention can save the process of supporting and removing the formwork, save construction time, and improve construction efficiency; at the same time, the installation is convenient and accurate, saving manpower and material resources, and improving the economy and practicality of the construction.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled bridge substructures, and in particular to an offshore assembled foundation system and a construction method thereof. Background Art

[0002] The construction of offshore bridges is very likely to cause production safety accidents due to the harsh construction environment and complex construction conditions.

[0003] At present, most multi-pile foundation construction adopts cast-in-place concrete, which has its advantages in construction, but also has obvious disadvantages in engineering practice, such as long construction period, difficulty in ensuring project quality, frequent safety accidents, etc. In addition, long-term work at sea has a great test on the physical and mental condition of construction workers.

[0004] Therefore, in view of the above problems, an offshore assembled foundation system and a construction method thereof are proposed to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention develops an offshore assembled foundation system and a construction method thereof, which can save the process of supporting and dismantling formwork, save construction time, and improve construction efficiency. At the same time, the installation is more convenient and accurate, saving manpower and material resources, and improving the economy and practicality of the construction.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] Offshore fabricated foundation system, including:

[0008] The pedestal body is a prefabricated part. A connecting steel bar is arranged on the pedestal top surface of the pedestal body. The connecting steel bar can be connected to the upper pier column. A pile hole is arranged on the pedestal bottom surface of the pedestal body. A steel cage is arranged in the pile hole. A grouting hole is arranged on the side wall of the pile hole through the pedestal body. The grouting hole is arranged on the top of the pile hole to facilitate grouting after grouting is completed.

[0009] A steel pipe pile, wherein the steel pipe pile is arranged corresponding to the pile hole, the steel pipe pile can be inserted into the pile hole, and the steel cage can be inserted into the tube cavity of the steel pipe pile. A steel plate is arranged on the outer wall of the steel pipe pile, and the steel plate can be supported on the outer edge of the pile hole and seal the gap between the steel pipe pile and the pile hole to avoid leakage during grouting. The steel cage strengthens the firmness of the connection between the steel pipe pile and the pile hole, thereby improving safety.

[0010] The leveling device includes a plurality of leveling members, all of which are arranged on the steel plate and can level the vertical direction of the cap body when the cap body is connected to the steel pipe pile;

[0011] The guide device is arranged at the side ends of the cap body and the steel pipe piles, and can guide the installation of the cap body when the cap body and the steel pipe piles are assembled.

[0012] Preferably, a cutout is provided on the side surface of the top of the steel pipe pile, and the shape of the cutout is an inverted triangle. An inner pile sealing plate is provided in the inner cavity of the steel pipe pile, and grouting holes are provided through the steel pipe pile wall above the inner pile sealing plate. The grouting holes are located between the steel plate and the inner pile sealing plate. The grouting holes are for facilitating grouting. At the same time, the inner pile sealing plate prevents the slurry poured into the steel pipe pile from flowing down, thereby saving materials and having good economy.

[0013] Preferably, the steel plate is arranged in a ring shape, corresponding to the gap when the steel pipe pile and the pile hole are connected, and two parallel layers are arranged, the leveling parts are arranged between the two layers of steel plates and connect the two layers of steel plates, the leveling parts include an upper connecting plate, an upper sealing layer plate, a rubber layer, a stiffening plate, a lower sealing layer plate and a lower connecting plate, the upper connecting plate is arranged at the bottom of the upper steel plate, the upper sealing layer plate is arranged at the bottom of the upper connecting plate, the bottom of the upper sealing layer plate is connected to the lower sealing layer plate through the rubber layer, the bottom of the lower sealing layer plate is arranged at the lower connecting plate, and the lower connecting plate is arranged at the top of the lower steel plate, the stiffening plate includes a plurality of stiffening plates, all of which are arranged in the rubber layer, through the synergistic effect of the rubber layer and the stiffening plates of the multiple leveling parts, due to the elasticity and self-balance of the rubber layer itself, the stiffening plate also provides support force for the inside of the rubber layer, thereby realizing micro-leveling in the vertical direction and improving the practicability of the device.

[0014] Preferably, connection holes are provided on both the upper connection plate and the lower connection plate, and the steel plates are connected by bolt and nut assemblies, so that the connection is stable, simple and economical.

[0015] Further preferably, the area of ​​the upper connecting plate is larger than that of the upper sealing plate, and the area of ​​the lower connecting plate is larger than that of the lower sealing plate, so as to stably connect the upper sealing plate, the lower sealing plate and the rubber layer therebetween, thereby improving the stability and practicality of the leveling device.

[0016] Preferably, the leveling device also includes a plurality of diagonal braces, which are arranged at the bottom of the lower steel plate and connected to the outer wall of the steel pipe piles. The force acting on the steel plate is borne partly by the steel pipe piles through the diagonal braces, so as to improve the stability of the support of the main body of the pedestal and the construction safety.

[0017] Preferably, a plurality of pile holes are provided, which are evenly and symmetrically distributed on the bottom surface of the pedestal, and the same number of steel pipe piles are provided corresponding to the pile holes. The plurality of steel pipe piles support the pedestal body, thereby improving the stability and safety of the pedestal itself.

[0018] Preferably, the guide device includes a guide head, a guide rod and a hoop, the hoop is sleeved on the steel pipe piles at both ends, and the hoop is located on the steel pipe piles below the steel plate, the guide rod is vertically arranged on the outside of the steel pipe piles at both ends, and the hoop is connected by a connecting rod, the guide head is arranged on both sides of the pedestal body, the guide head can be sleeved on the guide rod and slide up and down along the guide rod to realize the guidance of the pedestal body during the falling assembly, the positioning is more accurate, and the construction efficiency is improved.

[0019] Preferably, the guide head includes a sliding groove, the inner wall of the sliding groove can contact the outer wall of the guide rod, and a spring plate and a limit plate are arranged at the notch of the sliding groove. The spring plate is connected to the guide head through a spring and a hinge. The spring plate can facilitate the connection between the guide head and the guide rod, and the limit plate restricts the guide rod from detaching from the guide head, thereby improving safety during construction.

[0020] The present invention also provides a construction method, comprising the offshore assembled platform system as described above, comprising the following steps:

[0021] Step 1: Install each steel pipe pile according to the distribution of the pile holes on the main body of the cap, cut the pile head of each steel pipe pile flat, and set a cutout on the side of the pile top so that the pile tops of each steel pipe pile are at the same horizontal height;

[0022] Step 2: a pile inner sealing plate is set in the pipe cavity of the installed steel pipe pile, and a grouting hole is set through the steel pipe pile wall on the upper side of the pile inner sealing plate, a double-layer annular steel plate is set at the same height of the outer wall of each steel pipe pile, the elevation of the steel plate is determined according to the depth of the pile hole, a leveling piece is evenly set between the double-layer steel plates, and a plurality of diagonal braces are evenly set on the bottom of the lower steel plate and the outer wall of the steel pipe pile;

[0023] Step 3: Install the steel plate water-stop cofferdam to prevent water from entering the construction position of the assembled cap, so that water-free operation can be performed in the steel plate water-stop cofferdam. After the installation is completed, the concrete bottom is constructed underwater in the steel plate water-stop cofferdam to form the bottom concrete. After the strength of the bottom concrete meets the requirements, support is set up while pumping water in the cofferdam;

[0024] Step 4: Install the guide device, set the guide head on the side of the platform body, set the hoops on the steel pipe piles at both ends, set the guide rod vertically on the outside of the steel pipe piles at both ends, and connect the hoops through the connecting rod;

[0025] Step 5: The main body of the cap is transported to the construction sea area, and then hoisted and installed with a floating crane. After the main body of the cap is hoisted above the steel pipe pile, it is first preliminarily positioned, and then accurately positioned through the guide device. The guide head arranged on the side of the main body of the cap slowly falls along the vertical guide rod until the top of each steel pipe pile is accurately inserted into the pile hole, and at the same time, the steel cage in the pile hole is inserted into the tube cavity of the steel pipe pile, and the steel plate of each steel pipe pile is supported on the bottom surface of the cap. The leveling device finely levels the vertical direction of the main body of the cap;

[0026] Step six: Grouting. Use high-strength grouting material to fill the gaps between the steel pipe pile cavity, steel cage, pile hole and steel pipe pile through the grouting holes on the steel pipe pile. Stop grouting when the grouting hole oozes outward to form steel pipe pile concrete. When the high-strength grouting material reaches a certain strength, the construction is completed.

[0027] The effects provided in the summary of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solution has the following advantages:

[0028] 1. The present invention sets the foundation body as a prefabricated part, which is transported to the construction site after being prefabricated in the onshore prefabrication site, thus saving the process of offshore formwork and demoulding in the traditional technology, saving construction time, improving construction efficiency, saving costs, and having good economic performance;

[0029] 2. The present invention provides steel pipe piles and cooperates with the annular steel plate on the outer wall to grout the pile holes of the cap body, thereby supporting and fixing the cap body. At the same time, the annular steel plate can also block the gap between the steel pipe pile and the pile hole to avoid leakage during grouting, thereby improving the stability and safety of the construction.

[0030] 3. The present invention provides a leveling device, and the rubber layer and the stiffening plate of the multiple leveling parts work together. Due to the elasticity and self-balancing of the rubber layer, the stiffening plate also provides support for the inside of the rubber layer, thereby achieving fine leveling in the vertical direction. Compared with the traditional jack leveling, it saves more manpower and material resources and improves the construction efficiency.

[0031] 4. The present invention sets a guide device on the sides of the pedestal body and the steel pipe pile. During construction and assembly, the pedestal body is first hoisted above the steel pipe pile, and after initial positioning, the guide head and guide rod of the guide device are connected, and the pedestal body is slowly lowered along the vertical guide rod. The positioning is more accurate, the construction is safer, and the safety and practicality of the construction are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] Figure 1 It is a structural schematic diagram of the connection between the cap body and the steel pipe pile according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of a cross-sectional structure of a platform body in a top view according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of the connection between a steel pipe pile and a steel cage according to an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the top view of the steel pipe pile and the leveling member according to an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the overall structure of the cap body and the steel pipe piles according to an embodiment of the present invention;

[0038] Figure 6 It is a structural schematic diagram of a leveling device according to an embodiment of the present invention;

[0039] Figure 7 A schematic diagram of the structure of a leveling member according to an embodiment of the present invention;

[0040] Figure 8 It is a structural schematic diagram of a guide device according to an embodiment of the present invention;

[0041] Fig. 9 A schematic structural diagram of a guide head according to an embodiment of the present invention;

[0042] Fig.10 It is a schematic structural diagram of a steel plate water-stop cofferdam in an embodiment of the present invention.

[0043] In the figure, 1, the main body of the pedestal; 2, steel pipe piles; 3, the upper pier; 4, the concrete of the steel pipe piles; 5, the steel plate water-stopping cofferdam; 6, the leveling device; 7, the guide device; 11, the top surface of the pedestal; 12, the bottom surface of the pedestal; 13, the connecting steel bars; 14, the pile holes; 15, the grouting channel; 16, the steel cage; 21, the grouting hole; 22, the pile inner cover; 23, the steel plate; 24, the cutout; 41, the pile core concrete section; 42, the transition section ; 43. Outer edge concrete section; 51. Support; 61. Leveling piece; 62. Diagonal brace; 71. Guide head; 72. Guide rod; 73. Hoop; 74. Connecting rod; 611. Upper connecting plate; 612. Upper sealing plate; 613. Rubber layer; 614. Stiffening plate; 615. Lower sealing plate; 616. Lower connecting plate; 617. Bolt and nut assembly; 711. Sliding groove; 712. Spring piece; 713. Limiting piece. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0045] like Figure 1-9 As shown, the offshore fabricated cap system includes:

[0046] A cap body 1, the cap body 1 is a prefabricated part, a connecting steel bar 13 is arranged on the cap top surface 11 of the cap body 1, and the connecting steel bar 13 can be connected to the upper pier 3, a pile hole 14 is arranged on the cap bottom surface 12 of the cap body 1, a steel cage 16 is arranged in the pile hole 14, a grouting hole 15 is arranged on the side wall of the pile hole 14 through the cap body 1, and the grouting hole 15 is arranged at the top of the pile hole 14 to facilitate the overflow of grout after the grouting is completed; a steel pipe pile 2, the steel pipe pile 2 is arranged corresponding to the pile hole 14, the steel pipe pile 2 can be inserted in the pile hole 14, and the steel cage 16 can be inserted in the pipe cavity of the steel pipe pile 2, and a steel pipe pile 2 is arranged on the outer wall The steel plate 23 can be supported on the outer edge of the pile hole 14 and seal the gap between the steel pipe pile 2 and the pile hole 14 to avoid leakage during grouting. The steel cage 16 strengthens the anchoring effect of the connection between the steel pipe pile 2 and the pile hole 14, strengthens the firmness of the connection, and improves safety; the leveling device 6 includes a plurality of leveling members 61, all of which are arranged on the steel plate 23, and can level the vertical direction of the pedestal body 1 when the pedestal body 1 is connected to the steel pipe pile 2; the guide device 7 is arranged at the side ends of the pedestal body 1 and the steel pipe pile 2, and can guide the installation of the pedestal body 1 when the pedestal body 1 and the steel pipe pile 2 are assembled, thereby improving the accuracy of assembly.

[0047] In this embodiment, a cutout 24 is provided on the top side of the steel pipe pile 2, and the cutout 24 is in the shape of an inverted triangle, which can increase the area during grouting and reduce the grouting time. An inner pile sealing plate 22 is provided in the inner cavity of the steel pipe pile 2, and a grouting hole 21 is provided through the wall of the steel pipe pile 2 above the inner pile sealing plate 22. The grouting hole 21 is located between the steel plate 23 and the inner pile sealing plate 22. The grouting hole 21 is for facilitating grouting, and at the same time, the inner pile sealing plate 22 prevents the slurry poured into the steel pipe pile 2 from flowing down, thereby saving materials and having good economy.

[0048] In this embodiment, the steel plate 23 is arranged in an annular shape, corresponding to the gap when the steel pipe pile 2 and the pile hole 14 are connected, and two parallel layers are arranged. The leveling member 61 is arranged between the two layers of steel plates 23 and connects the two layers of steel plates 23. The leveling member 61 includes an upper connecting plate 611, an upper sealing layer plate 612, a rubber layer 613, a stiffening plate 614, a lower sealing layer plate 615 and a lower connecting plate 616. The upper connecting plate 611 is arranged at the bottom of the upper steel plate 23, the upper sealing layer plate 612 is arranged at the bottom of the upper connecting plate 611, and the upper sealing layer plate 612 is arranged at the bottom of the upper sealing layer plate 612. The lower sealing layer plate 615 is connected to the lower sealing layer plate 615 through the rubber layer 613, and the lower connecting plate 616 is arranged at the bottom of the lower sealing layer plate 615. The lower connecting plate 616 is arranged on the top of the lower steel plate 23. The stiffening plates 614 include several ones, which are all arranged in the rubber layer 613. Through the synergistic effect of the rubber layer 613 and the stiffening plates 614 of the multiple leveling parts, due to the elasticity and self-balance of the rubber layer 613 itself, and the stiffening plates 614 provide supporting force for the inside of the rubber layer 613, fine leveling in the vertical direction is achieved, thereby improving the practicability of the device.

[0049] In another embodiment, the upper steel plate of the steel plate 23 is connected to the leveling piece 61. The upper steel plate of the leveling piece 61 plays a supporting role and is slidingly connected to the steel pipe pile 2. When the base body 1 falls on the upper steel plate and is leveled by the leveling piece 61, it has a certain degree of mobility, making it more convenient to level the leveling piece 61 and improving its practicality.

[0050] In this embodiment, connection holes are provided on the upper connection plate 611 and the lower connection plate 616, and the steel plates 23 are connected by passing bolt and nut assemblies 617 through the connection holes. The connection is stable, simple and economical.

[0051] In this embodiment, the area of ​​the upper connecting plate 611 is larger than that of the upper sealing plate 612, and the area of ​​the lower connecting plate 616 is larger than that of the lower sealing plate 615, so as to stably connect the upper sealing plate 612, the lower sealing plate 615 and the rubber layer 613 therebetween, thereby improving the stability and practicality of the leveling device.

[0052] In this embodiment, the leveling device 6 also includes 12 diagonal braces 62, which are arranged at the bottom of the lower steel plate 23 and connected to the outer wall of the steel pipe piles 2. The diagonal braces 62 allow the steel pipe piles 2 to bear part of the force acting on the steel plate 23, so as to improve the stability of the support for the base body 1 and the construction safety.

[0053] In this embodiment, eight pile holes 14 are arranged, which are evenly and symmetrically distributed on the bottom surface 12 of the foundation. Slurry outlet channels 15 are arranged in the pile holes 14. The same number of steel pipe piles 2 are arranged corresponding to the pile holes 14. The eight steel pipe piles 2 support the foundation body 1, thereby improving the stability and safety of the foundation itself.

[0054] In this embodiment, the guide device 7 includes four groups of guide heads 71, guide rods 72 and hoop 73. The hoop 73 is sleeved on the steel pipe piles 2 at both ends, and the hoop 73 is located on the steel pipe piles 2 below the steel plate 23. The guide rods 72 are vertically arranged on the outside of the steel pipe piles 2 at both ends, and the hoop 73 is connected by a connecting rod 74. The guide heads 71 ​​are arranged on both sides of the base body 1. The guide heads 71 ​​can be sleeved on the guide rods 72 and slide up and down along the guide rods 72 to realize the guidance of the base body 1 during the falling assembly, so that the positioning is more accurate and the construction efficiency is improved.

[0055] In this embodiment, the guide head 71 is configured as an outer ladder and inner circular structure. The guide head 71 includes a sliding groove 711. The inner wall of the sliding groove 711 can contact the outer wall of the guide rod 72. A spring piece 712 and a limit piece 713 are arranged at the notch of the sliding groove 711. The spring piece 712 is connected to the guide head 71 through a hinge. The connection position is at the outer end of the circular structure inside the guide head 71. A hinge is installed at the connection position of the guide head 71, so that one end of the hinge is connected to the guide head 71 and the other end is connected to the spring piece 712, which plays a role in fixing the spring piece 712 and forming a rotating structure. A spring is arranged at the connection position, one end of the spring is connected to the guide head 71, and the other end is connected to the center position of the spring piece 712. The spring piece 712 is forced to open, so that the guide rod 72 can move toward the inside of the guide head 71 until the sliding groove 711 bites the guide rod 72. At this time, the spring piece 712 unloads the force and returns to its original position. At this time, the spring piece 712 and the limiting piece 713 tightly clamp the guide rod 72, ensuring the coordination between the guide head 71 and the guide rod 72 when they fall. The limiting piece 713 restricts the guide rod 72 from separating from the guide head 71, thereby improving safety during construction. Embodiment 2

[0056] A construction method, comprising the offshore assembled platform system as described above, comprises the following steps:

[0057] Step 1: Install each steel pipe pile 2 according to the distribution of the pile holes 14 on the cap body 1, cut the pile head of each steel pipe pile 2 flat, and set a notch 24 on the side of the pile top so that the pile tops of each steel pipe pile 2 are at the same horizontal height;

[0058] Step 2: a pile inner sealing plate 22 is arranged in the tube cavity of the installed steel pipe pile 2, and a grouting hole 21 is penetrated on the tube wall of the steel pipe pile 2 on the upper side of the pile inner sealing plate 22, a double-layer annular steel plate 23 is arranged at the same height of the outer wall of each steel pipe pile 2, the elevation of the steel plate 23 is determined according to the depth of the pile hole 14, a leveling member 61 is evenly arranged between the double-layer steel plates 23, and 12 diagonal braces 62 are evenly arranged at the bottom of the lower steel plate 23 and on the outer wall of the steel pipe pile 2;

[0059] Step 3: Install a steel plate water-stop cofferdam 5 outside the installed steel pipe pile 2 to prevent water from entering the construction position of the assembled cap, so that water-free operation can be carried out in the cofferdam to achieve the construction effect. After the installation is completed, the bottom of the cofferdam is sealed with concrete to form bottom sealing concrete. Support 51 is set while pumping water in the cofferdam. Fig.10 As shown;

[0060] Step 4: Install the guide device 7, set the guide head 71 on the side of the platform body 1, set the hoops 73 on the steel pipe piles 2 at both ends and fix them on the steel pipe piles 2, set the guide rods 72 vertically on the outside of the steel pipe piles 2 at both ends, and connect the hoops 73 through the connecting rods 74;

[0061] Step 5: transport the foundation body 1 to the construction sea area, and then use a floating crane to lift and install it. After the foundation body 1 is lifted above the steel pipe pile 2, it is first preliminarily positioned, and then accurately positioned by the guide device 7. The guide head 71 set on the side of the foundation body 1 slowly falls along the vertical guide rod 72 until the pile tops of each steel pipe pile 2 are accurately inserted into the pile hole 14, and at the same time, the steel cage 16 in the pile hole 14 is inserted into the tube cavity of the steel pipe pile 2, and the steel plate 23 of each steel pipe pile 2 is supported on the bottom surface 12 of the foundation. The leveling device 6 performs fine leveling on the vertical direction of the foundation body 1;

[0062] Step six: grouting. Use high-strength grouting material to fill the cavity of the steel pipe pile 2, the steel cage 16, the pile hole 14 and the gap between the steel pipe pile 2 through the grouting holes 21 on the steel pipe pile 2. When the grouting hole 15 slurries outward, stop grouting to form steel pipe pile concrete 4. When the high-strength grouting material reaches a certain strength, the construction is completed.

[0063] In this embodiment, during grouting in step six, a small amount of high-strength grouting material is first poured in to seal the pile inner sealing plate 22 to form a bottom layer of concrete, which can increase the integrity of the pile inner sealing plate 22 and the steel pipe pile 2. After the bottom layer of concrete reaches a certain strength, grouting is continued. The high-strength grouting material is grouted from the steel pipe pile 2 from bottom to top through a concrete pump until grout is discharged from the orifice of the grouting channel 15, and the grouting is stopped. At this time, the high-strength grouting material has completely filled the inner cavity of the steel pipe pile 2, the pile hole 14, the steel cage 16, and the gap between the steel pipe pile 2 and the pile hole 14, and formed a steel pipe pile concrete 4, as shown in FIG. Figure 3 As shown, the steel pipe pile concrete 4 includes a pile core concrete section 41, a transition section 42 and an extension concrete section 43. When the high-strength grouting material reaches a certain strength, the construction is completed.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Offshore assembled platform system, characterized in that: include: A cap body (1), wherein a cap top surface (11) of the cap body (1) is provided with connecting steel bars (13), the connecting steel bars (13) being capable of connecting to an upper pier column (3), a pile hole (14) being provided on a cap bottom surface (12) of the cap body (1), a steel cage (16) being provided in the pile hole (14), and a grout outlet channel (15) being provided on a side wall of the pile hole (14) and penetrating through the cap body (1); A steel pipe pile (2), wherein the steel pipe pile (2) is arranged corresponding to the pile hole (14), the steel pipe pile (2) can be inserted into the pile hole (14), and the steel cage (16) can be inserted into the tube cavity of the steel pipe pile (2), and a steel plate (23) is arranged on the outer wall of the steel pipe pile (2), and the steel plate (23) can be supported on the outer edge of the pile hole (14) and block the gap between the steel pipe pile (2) and the pile hole (14); A leveling device (6) comprising a plurality of leveling members (61) which are all arranged on the steel plate (23) and are capable of leveling the vertical direction of the base body (1) when the base body (1) is connected to the steel pipe pile (2); A guide device (7) is arranged at the side ends of the cap body (1) and the steel pipe pile (2), and is capable of guiding the cap body (1) during installation when the cap body (1) and the steel pipe pile (2) are assembled; A notch (24) is provided on the side surface of the top of the steel pipe pile (2), and the notch (24) is in the shape of an inverted triangle. An inner pile sealing plate (22) is provided in the inner cavity of the steel pipe pile (2), and a grouting hole (21) is provided through the wall of the steel pipe pile (2) above the inner pile sealing plate (22), and the grouting hole (21) is located between the steel plate (23) and the inner pile sealing plate (22); The steel plate (23) is arranged in an annular shape and is provided with two parallel layers. The leveling member (61) is arranged between the two layers of steel plates (23) and connects the two layers of steel plates (23). The leveling member (61) comprises an upper connecting plate (611), an upper sealing layer plate (612), a rubber layer (613), a stiffening plate (614), a lower sealing layer plate (615) and a lower connecting plate (616). The upper connecting plate (611) is arranged at the bottom of the upper steel plate (23). The upper sealing layer plate (612) is arranged at the bottom of the upper connecting plate (611). The bottom of the upper sealing layer plate (612) is connected to the lower sealing layer plate (615) through the rubber layer (613). The bottom of the lower sealing layer plate (615) is provided with a lower connecting plate (616). The lower connecting plate (616) is arranged at the top of the lower steel plate (23). The stiffening plates (614) comprise a plurality of plates, all of which are arranged in the rubber layer (613).

2. The offshore fabricated platform system according to claim 1, characterized in that: The area of ​​the upper connection plate (611) is larger than that of the upper sealing layer plate (612), and the area of ​​the lower connection plate (616) is larger than that of the lower sealing layer plate (615).

3. The offshore fabricated platform system according to claim 2, characterized in that: The leveling device (6) further comprises a plurality of diagonal braces (62), wherein the diagonal braces (62) are arranged at the bottom of the steel plate (23) of the lower layer and connected to the outer wall of the steel pipe pile (2).

4. The offshore fabricated platform system according to claim 3 is characterized in that: A plurality of pile holes (14) are arranged, evenly and symmetrically distributed on the bottom surface (12) of the cap, and a plurality of steel pipe piles (2) are arranged corresponding to the pile holes (14).

5. The offshore fabricated platform system according to claim 4, characterized in that: The guide device (7) comprises a guide head (71), a guide rod (72) and a hoop (73); the hoop (73) is sleeved on the steel pipe piles (2) at both ends, and the hoop (73) is located on the steel pipe piles (2) below the steel plate (23); the guide rod (72) is vertically arranged outside the steel pipe piles (2) at both ends, and is connected to the hoop (73) via a connecting rod (74); the guide head (71) is arranged on both sides of the platform body (1); the guide head (71) can be sleeved on the guide rod (72) and slide up and down along the guide rod (72).

6. The offshore fabricated platform system according to claim 5, characterized in that: The guide head (71) comprises a sliding groove (711), the inner wall of the sliding groove (711) can be slidably connected to the outer wall of the guide rod (72), and a spring piece (712) and a limit piece (713) are arranged at the notch of the sliding groove (711).

7. A construction method, comprising the offshore assembled platform system according to claim 6, characterized in that: The following steps are involved: Step 1: installing each steel pipe pile (2) according to the distribution of the pile holes (14) on the foundation body (1), flattening the pile heads of each steel pipe pile (2), and providing a notch (24) on the side of the pile top, so that the pile tops of each steel pipe pile (2) are at the same horizontal height; Step 2: a pile inner sealing plate (22) is arranged in the tube cavity of the installed steel pipe pile (2), and a grouting hole (21) is arranged through the tube wall of the steel pipe pile (2) on the upper side of the pile inner sealing plate (22), a double-layer annular steel plate (23) is arranged at the same height of the outer wall of each steel pipe pile (2), the elevation of the steel plate (23) is determined according to the depth of the pile hole (14), a leveling member (61) is evenly arranged between the double-layer steel plates (23), and a plurality of diagonal braces (62) are evenly arranged at the bottom of the lower steel plate (23) and on the outer wall of the steel pipe pile (2); Step 3: Install the steel plate water-stop cofferdam (5). After the installation is completed, perform concrete bottom sealing construction under the water in the cofferdam to form bottom sealing concrete. After the bottom sealing concrete strength meets the requirements, support is set up while pumping water in the cofferdam (51); Step 4: Install the guide device (7), set a guide head (71) on the side of the platform body (1), set a hoops (73) on the steel pipe piles (2) at both ends, set the guide rod (72) vertically on the outside of the steel pipe piles (2) at both ends, and connect the hoops (73) through the connecting rod (74); Step 5: The foundation body (1) is transported to the construction sea area, and then hoisted and installed by a floating crane. After the foundation body (1) is hoisted above the steel pipe pile (2), it is first preliminarily positioned, and then accurately positioned by the guide device (7). The guide head (71) arranged on the side of the foundation body (1) slowly falls along the vertical guide rod (72) until the pile top of each steel pipe pile (2) is accurately inserted into the pile hole (14), and at the same time, the steel cage (16) in the pile hole (14) is inserted into the tube cavity of the steel pipe pile (2), and the steel plate (23) of each steel pipe pile (2) is supported on the bottom surface (12) of the foundation, and the leveling device (6) performs fine leveling on the vertical direction of the foundation body (1); Step 6: Grouting: The cavity of the steel pipe pile (2), the steel cage (16), the pile hole (14) and the gap between the steel pipe pile (2) are filled with high-strength grouting material through the grouting holes (21) on the steel pipe pile (2). When the grouting hole (15) slurries outward, the grouting is stopped to form steel pipe pile concrete (4). When the high-strength grouting material reaches a certain strength, the construction is completed.

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