Multi-element stable offshore large-span cast-in-place reverse-hanging supporting system structure

Abstract

A multi-element stable offshore large-span cast-in-place reverse hanging supporting system structure comprises a reverse hanging beam erected on a steel pipe pile, pull rods, a main beam and a secondary beam, the reverse hanging beam, the main beam and the secondary beam are all made of I-shaped steel, and a pile top steel beam is installed at the top of the steel pipe pile; the multi-element stable offshore large-span cast-in-place reverse hanging supporting system structure has remarkable advantages in the aspects of stability, bearing capacity, construction convenience, economic benefits and the like, can effectively solve the problem of temporary supporting in offshore large-span cast-in-place structure construction, and has wide application prospects. The defect that in the prior art, when a temporary supporting structure is used for construction of an offshore large-span cast-in-place structure, the requirements for stability, bearing capacity and construction convenience are often difficult to meet is effectively overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of inverted hanging support systems, and in particular relates to a multi-stable offshore large-span cast-in-place inverted hanging support system structure. Background Art

[0002] In offshore engineering construction, as mentioned in the prior art with patent publication number "CN218234345U", the construction of large-span cast-in-place structures faces many challenges. Due to the complex marine environment, natural factors such as wind, waves, and tides have a great impact on the construction process, and the offshore construction site is limited, and the transportation and operation of large-scale construction equipment are difficult. Traditional temporary support structures are often difficult to meet the requirements of stability, bearing capacity, and construction convenience when facing the construction of large-span cast-in-place structures at sea. For example, in some early offshore projects, temporary support structures were unable to withstand the lateral forces caused by sea breezes and waves, the deadweight of large-span structures, and construction loads, resulting in structural deformation or even collapse, which not only endangered the safety of construction workers, but also seriously affected the progress and quality of the project. Therefore, it is of great practical significance to develop a temporary support system specifically suitable for large-span cast-in-place structures at sea. Summary of the invention

[0003] In order to solve the defects in the prior art, the present invention proposes a multi-stable large-span cast-in-place inverted support system structure at sea, including: an inverted beam, a tie rod, a main beam and a secondary beam erected on a steel pipe pile, wherein the inverted beam, the main beam and the secondary beam are all made of I-beams, and a pile top steel beam is installed on the top of the steel pipe pile; the defects of the temporary support structure in the prior art that it is often difficult to meet the requirements of stability, bearing capacity and construction convenience when facing the construction of large-span cast-in-place structures at sea are effectively avoided. The multi-stable large-span cast-in-place inverted support system structure at sea has significant advantages in terms of stability, bearing capacity, construction convenience and economic benefits, and can effectively solve the temporary support problem in the construction of large-span cast-in-place structures at sea, and has broad application prospects.

[0004] The present invention uses the following technical solutions.

[0005] A multi-stable offshore large-span cast-in-place inverted support system structure, comprising: The anti-hanging beam, tie rod, main beam and secondary beam erected on the steel pipe piles are all made of I-beams; A pile top steel beam is installed on the top of the steel pipe pile.

[0006] Furthermore, before installing the multi-stable offshore large-span cast-in-place inverted support system structure, the core concrete pouring of the steel pipe piles needs to be completed.

[0007] Furthermore, a plurality of rectangular strip-shaped wood blocks and a plate-shaped wood module are arranged equidistantly from bottom to top on the top of the secondary beam.

[0008] Furthermore, the I-beams used in the counter-hanging beam, the main beam and the secondary beam are 457×191×74 I-beams.

[0009] Furthermore, the pile top steel beam adopts a box beam structure composed of three I-beams.

[0010] Furthermore, the main beam is formed by welding two I-beams into a box beam structure, and the main beam is divided into an outer main beam and an inner main beam, wherein the outer main beam is farther from the steel pipe piles and the inner main beam is closer to the steel pipe piles.

[0011] Furthermore, the upper part of the tie rod is connected to the pile top steel beam in the vertical direction, and the lower part of the tie rod is connected to the main beam.

[0012] Furthermore, the connection structure between the anti-hanging beam and the pull rod includes: Connection node, the structure of the connection node is: the lower hanging point on the anti-hanging beam for connecting the tie rod adopts the method of welding node plate, the node plate is S275 steel plate with a thickness of 20mm; the node plate is connected to the web of the anti-hanging beam by welding, and the corresponding weld height is 10mm. A connection hole with a diameter 3mm larger than the tie rod is opened on the node plate, and the hole position accuracy is controlled within ±1mm.

[0013] Furthermore, the installation method of the tie rod is: the tie rod is made of high-quality rolled threaded steel, the diameter of the tie rod is 32mm, and the tie rod is divided into an inner tie rod and an outer tie rod. The inner tie rod is 0.8m away from the pile center, and the outer tie rod is 1.4m away from the pile center. During installation, first screw the matching nut to one end of the tie rod, insert it into the connecting hole of the node plate on the inverted beam, and then screw on the nut at the other end. Use a torque wrench to tighten the nut according to the designed torque, and fix it by spot welding after the nut is tightened.

[0014] Furthermore, the connection structure between the main beam and the tie rod includes: Reinforcement plates and positioning ear plates are welded on the flange plates of the main beam. The material of the reinforcement plates and positioning ear plates is S275 steel plates. The thickness of the S275 steel plates is 12mm. Stiffening plates are welded on the intersecting side surfaces of the main beam and the tie rod.

[0015] Furthermore, the reinforcement structure of the main beam includes: reinforcing steel plates are added to the upper and lower wing plates of the main beam at the mid-span position of the secondary beam, stiffening ribs are set at the connection nodes between the main beam and the counter-suspended beam and the secondary beam, the reinforcing steel plates and stiffening ribs are all made of 12mm thick S275 steel plates, and the stiffening ribs are connected to the web and flange plates of the main beam by fillet welds with a weld height of 12mm.

[0016] Furthermore, the connection structure between the secondary beam and the main beam includes: adding a 12mm reinforcing plate at the connection between the main beam and the secondary beam, the reinforcing plate is made of S275 steel, and its size is larger than the contact surface between the secondary beam and the main beam, and the reinforcing plate is connected to the flange plate of the main beam and the secondary beam by using 8.8-grade M20 bolts. The number of connecting bolts between each reinforcing plate and the main beam and the secondary beam is not less than 4. During construction, first use a magnetic drill to drill holes in the reinforcing plate and the beam flange plate. The drill diameter is 1.5mm larger than the nominal diameter of the bolt, and the hole position deviation is controlled within ±1mm.

[0017] The beneficial effects of the present invention are that, compared with the prior art, the present invention has the following technical effects: 1. Enhanced stability Through the synergistic effect of the foundation support system, vertical bearing structure, horizontal support and connecting structure, the temporary support system of the present invention, that is, the multi-stable offshore large-span cast-in-place inverted support system architecture, has been put into practice to control the lateral displacement of the structure within the design allowable range under harsh marine environmental conditions. Compared with traditional temporary support structures, the stability is significantly improved, effectively ensuring the safety of the offshore large-span cast-in-place structure during construction.

[0018] 2. Improved carrying capacity After actual engineering case tests and mechanical analysis, the temporary support system of the present invention, that is, the multi-stable offshore large-span cast-in-place inverted support system architecture can withstand a vertical load of 53.5kN / m2, a span of 7.5m, and a concrete pouring thickness of 1.2m, meeting the construction load requirements of offshore large-span cast-in-place structures, ensuring that the structure will not be damaged or excessively deformed due to insufficient bearing capacity during the concrete pouring process.

[0019] 3. Improved construction convenience Since the inverted beam, main beam and secondary beam are all made of the same type of I-beam (457×191×74), the various components of the multi-stable offshore large-span cast-in-place inverted support system structure are welded and processed in the factory, and modular assembly is adopted on site, which greatly shortens the construction period.

[0020] To sum up, the temporary support system for large-span cast-in-place offshore structures of the present invention, that is, the multi-stable large-span cast-in-place offshore inverted support system structure, has significant advantages in stability, bearing capacity, construction convenience and economic benefits, and can effectively solve the temporary support problem in the construction of large-span cast-in-place offshore structures, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall appearance of the multi-stable offshore large-span cast-in-place inverted support system structure described in the present invention Three-dimensional structure diagram; Figure 2It is a detailed cross-sectional structural diagram of the inverted hanging beam used in the multi-stable offshore large-span cast-in-place inverted hanging support system structure of the present invention; Figure 3 It is a three-dimensional structural diagram of a smaller span between steel pipe piles of the multi-stable offshore large-span cast-in-place inverted hanging support system structure of the present invention, and the span is 6500mm; Figure 4 It is a three-dimensional structural diagram of a large span between steel pipe piles of the multi-stable offshore large-span cast-in-place inverted hanging support system structure of the present invention, and the span is 7500mm; Figure 5 It is a cross-sectional structural diagram of the inverted hanging beam and the tie rod of the multi-element stable offshore large-span cast-in-place inverted hanging support system structure described in the present invention; Figure 6 It is a schematic plan view of the main beam and tie rod installation details of the multi-stable offshore large-span cast-in-place inverted hanging support system structure of the present invention; Figure 7 It is a three-dimensional detailed schematic diagram of the main beam and tie rod installation of the multi-stable offshore large-span cast-in-place inverted hanging support system structure described in the present invention; Figure 8 It is a planar detail schematic diagram of the inverted hanging beam and the tie rod of the multi-stable offshore large-span cast-in-place inverted hanging support system structure described in the present invention; Fig. 9 It is a three-dimensional detailed schematic diagram of the inverted hanging beam and the tie rod of the multi-stable offshore large-span cast-in-place inverted hanging support system structure described in the present invention; Fig.10 It is a three-dimensional schematic diagram of the reinforcement structure of the main beam of the multi-stable offshore large-span cast-in-place inverted hanging support system structure of the present invention; Fig.11 It is a three-dimensional schematic diagram of the connection structure between the secondary beam and the main beam of the multi-stable offshore large-span cast-in-place inverted hanging support system structure described in the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely expressed in combination with the drawings in the embodiments of the present invention. The embodiments expressed in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0023] like Figures 1 to 11 As shown, the multi-stable offshore large-span cast-in-place inverted support system structure of the present invention comprises: The anti-hanging beam 2, the tie rod 3, the main beam 4 and the secondary beam 5 erected on the steel pipe pile 1 are all made of I-beams, that is, all the steel beams are made of 457×191×74 (British standard) I-beams; A pile top steel beam 6 is installed on the top of the steel pipe pile 1 .

[0024] In a preferred but non-restrictive embodiment of the present invention, the entire multi-stable offshore large-span cast-in-place inverted support system structure can meet the requirements of 1.2m high (based on the pile span of 7.5m×6.5m between the steel pipe piles 1) concrete pouring. Before installing this multi-stable offshore large-span cast-in-place inverted support system structure, the core concrete pouring of the steel pipe piles 1 must be completed to strengthen the pile top of the steel pipe pile 1 and ensure the stability of the multi-stable offshore large-span cast-in-place inverted support system structure. This temporary support system, that is, the multi-stable offshore large-span cast-in-place inverted support system structure is designed to bear a load of up to 53.5kN / m2.

[0025] In a preferred but non-limiting embodiment of the present invention, a plurality of rectangular strip-shaped wood squares 9 and a plate-shaped wood module 10 are arranged equidistantly in sequence from bottom to top on the top of the secondary beam 5 .

[0026] In a preferred but non-limiting embodiment of the present invention, the I-beams used in the inverted beam 2, the main beam 4 and the secondary beam 5 are 457×191×74 (British standard) I-beams.

[0027] The main technical solutions of the multi-stable offshore large-span cast-in-place inverted support system structure are as follows: In a preferred but non-restrictive embodiment of the present invention, the pile top steel beam 6 serves as the core load-bearing element and adopts a box beam structure composed of three I-beams. It shoulders the task of receiving the concentrated load transmitted from the upper structure to the pile top of the steel pipe pile 1, and relies on the optimized mechanical conduction system to disperse the borne load to the pile foundation of the steel pipe pile in a uniform and efficient manner, thereby ensuring the balance and stability of the stress state of the entire infrastructure, laying a solid foundation for the subsequent structure.

[0028] In a preferred but non-limiting embodiment of the present invention, the main beam 4, as a key structural part of the load-bearing system, innovatively adopts two I-beams welded together into a box beam structure. Since the main beam 4 is divided into an outer main beam 7 and an inner main beam 8, the outer main beam 7 is farther from the steel pipe pile 1 and the inner main beam 8 is closer to the steel pipe pile 1, which greatly improves the stability of the overall structure. At the structural detail design level, the main beam is further subdivided into two functional areas, the inner side and the outer side. The outer steel beam, with its relatively wide bearing surface area, effectively bears various loads imposed by the external environment, and successfully builds a stable and efficient force transmission link with the help of the stable connection nodes constructed between the pile top steel beam and the secondary beam, ensuring that the load can be transmitted smoothly without hindrance and maintaining the continuity of structural mechanical transmission; the inner steel beam focuses on providing strong support for the load in the internal area, carefully planning the arrangement spacing, and comprehensively considering the scientific division of the concrete pouring area and the actual distribution characteristics of the load, which effectively enhances the bending bearing performance of the overall structure and provides a solid guarantee for the stable operation of the temporary structure under complex stress conditions. The main beam is arranged on the side with a small span, and the secondary beam is arranged on the side with a large span. Because the main beam is divided into inner and outer sides, the support width of the secondary beam is increased, so that the maximum span in the measurement direction is reduced from 7.5m to 4.5m, which greatly reduces the span.

[0029] In a preferred but non-limiting embodiment of the present invention, the tie rod 3 plays an important role in tying and stabilizing the entire structural system. The upper part of the tie rod is connected to the pile top steel beam 6 in the vertical direction, and the lower part of the tie rod 3 is connected to the main beam 4, forming a spatially stable structure that effectively resists horizontal loads and structural deformation. Its arrangement position and number are determined based on the structural force analysis to ensure that the overall stability of the structure can be maintained under different working conditions and prevent the occurrence of local instability.

[0030] The detailed structure of the multi-stable offshore large-span cast-in-place inverted support system is as follows: In a preferred but non-limiting embodiment of the present invention, the connection structure between the inverted hanging beam 2 and the pull rod 3 includes: Connecting node, the structure of the connecting node is: the lower hanging point on the anti-hanging beam 2 for connecting the tie rod 3 (that is, the lower end of the tie rod 3) adopts the method of welding the node plate 14, and the node plate 14 is selected to be an S275 steel plate with a thickness of 20mm, and the size is determined according to the distribution of the tie rod and the anti-hanging beam structure; the node plate 14 is connected to the web of the anti-hanging beam by welding, and the corresponding weld height is 10mm. A connecting hole with a diameter 3mm larger than the tie rod is opened on the node plate 14, and the hole position accuracy is controlled within ±1mm to ensure that the tie rod is installed smoothly and accurately.

[0031] In a preferred but non-restrictive embodiment of the present invention, the installation method of the tie rod 3 is as follows: the tie rod 3 is made of finely rolled threaded steel, the diameter of the tie rod 3 is 32 mm, the tie rod 3 is divided into an inner tie rod 12 and an outer tie rod 13, the inner tie rod 12 is 0.8 m away from the pile center, and the outer tie rod 13 is 1.4 m away from the pile center. During installation, first screw the matching nut 17 to one end of the tie rod 3, insert it through the connection hole of the node plate 14 on the inverted hanging beam 2, and then screw on the nut 17 at the other end, use a torque wrench to tighten the nut 17 according to the designed torque, ensure the tie rod preload, and make the inverted hanging beam 2 and the tie rod 3 tightly connected. To prevent the nut 17 from loosening, the nut 17 is tightened and fixed by spot welding.

[0032] In a preferred but non-limiting embodiment of the present invention, the connection structure between the main beam 4 and the tie rod 3 includes: Reinforcement plate and positioning lug plate: Reinforcement plate and positioning lug plate are welded on the flange plate of main beam 4. The material of reinforcement plate and positioning lug plate is S275 steel plate. The thickness of S275 steel plate is 12mm. The size of S275 steel plate is determined according to the size of main beam. Stiffening plate 16 is welded on the side where main beam 4 and tie rod 3 intersect to increase node strength.

[0033] In a preferred but non-limiting embodiment of the present invention, the reinforcement structure of the main beam 4 includes: in order to increase the box beam structural stability of the main beam 4, the main beam 4 is provided with a reinforcing steel plate 15 on the upper and lower wing plates 19 at the mid-span position of the secondary beam 5, and a stiffening rib 18 is provided at the connection node between the main beam 4 and the inverted beam and the secondary beam. The reinforcing steel plate 15 and the stiffening rib are both made of 12mm thick S275 steel plates, and the size is determined by the size of the main beam. The stiffening rib 18 is connected to the web and flange plate of the main beam by fillet welds, and the weld height is 12mm, so as to enhance the stability and bending resistance of the main beam when bearing loads.

[0034] In a preferred but non-restrictive embodiment of the present invention, the connection structure between the secondary beam 5 and the main beam 4 includes: adding a 12mm reinforcing plate 11 at the connection between the main beam 4 and the secondary beam 5, the reinforcing plate 11 is made of S275 steel, and the size should be larger than the contact surface between the secondary beam 5 and the main beam 4, the reinforcing plate 11 is connected to the flange plate 20 of the main beam 4 and the secondary beam 5 by 8.8 grade M20 bolts 21, and the number of connecting bolts between each reinforcing plate 11 and the main beam and the secondary beam is not less than 4. During construction, first use a magnetic drill to drill holes in the reinforcing plate 11 and the beam flange plate, the diameter of the drill hole is 1.5mm larger than the nominal diameter of the bolt, and the hole position deviation is controlled within ±1mm.

[0035] The beneficial effects of the present invention are that, compared with the prior art, the present invention has the following technical effects: 1. Enhanced stability Through the synergistic effect of the foundation support system, vertical bearing structure, horizontal support and connecting structure, the temporary support system of the present invention, that is, the multi-stable offshore large-span cast-in-place inverted support system architecture, has been put into practice to control the lateral displacement of the structure within the design allowable range under harsh marine environmental conditions. Compared with traditional temporary support structures, the stability is significantly improved, effectively ensuring the safety of the offshore large-span cast-in-place structure during construction.

[0036] 2. Improved carrying capacity After actual engineering case tests and mechanical analysis, the temporary support system of the present invention, that is, the multi-stable offshore large-span cast-in-place inverted support system architecture can withstand a vertical load of 53.5kN / m2, a span of 7.5m, and a concrete pouring thickness of 1.2m, meeting the construction load requirements of offshore large-span cast-in-place structures, ensuring that the structure will not be damaged or excessively deformed due to insufficient bearing capacity during the concrete pouring process.

[0037] 3. Improved construction convenience Since the inverted beam, main beam and secondary beam are all made of the same type of I-beam (457×191×74), the various components of the multi-stable offshore large-span cast-in-place inverted support system structure are welded and processed in the factory, and modular assembly is adopted on site, which greatly shortens the construction period.

[0038] To sum up, the temporary support system for large-span cast-in-place offshore structures of the present invention, that is, the multi-stable large-span cast-in-place offshore inverted support system structure, has significant advantages in stability, bearing capacity, construction convenience and economic benefits, and can effectively solve the temporary support problem in the construction of large-span cast-in-place offshore structures, and has broad application prospects.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not deviate from the spirit and scope of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-stable offshore large-span cast-in-place inverted support system structure, characterized in that: include: The anti-hanging beam, tie rod, main beam and secondary beam erected on the steel pipe piles are all made of I-beams; A pile top steel beam is installed on the top of the steel pipe pile.

2. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 1 is characterized in that: Before installing this multi-stable offshore large-span cast-in-place inverted support system structure, the core concrete pouring of the steel pipe piles must be completed.

3. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 2 is characterized in that: A plurality of rectangular strips of wood and a plate-shaped wood module are arranged equidistantly from bottom to top on the top of the secondary beam; The I-beams used for the counter-hanging beam, main beam and secondary beam are 457×191×74 I-beams.

4. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 3 is characterized in that: The steel beam on the pile top adopts a box beam structure composed of three I-beams.

5. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 4 is characterized in that: The main beam is made of two I-beams welded together into a box beam structure. The main beam is divided into an outer main beam and an inner main beam. The outer main beam is farther away from the steel pipe piles while the inner main beam is closer to the steel pipe piles.

6. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 5 is characterized in that: The upper part of the tie rod is connected to the pile top steel beam in the vertical direction, and the lower part of the tie rod is connected to the main beam.

7. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 6 is characterized in that: The connection structure between the inverted hanging beam and the tie rod includes: Connection node, the structure of the connection node is: the lower hanging point on the anti-hanging beam for connecting the tie rod adopts the method of welding node plate, the node plate is S275 steel plate with a thickness of 20mm; the node plate is connected to the web of the anti-hanging beam by welding, and the corresponding weld height is 10mm. A connection hole with a diameter 3mm larger than the tie rod is opened on the node plate, and the hole position accuracy is controlled within ±1mm.

8. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 7 is characterized in that: The installation method of the tie rod is: the tie rod is made of fine-rolled threaded steel, the diameter of the tie rod is 32mm, and the tie rod is divided into an inner tie rod and an outer tie rod. The inner tie rod is 0.8m away from the pile center, and the outer tie rod is 1.4m away from the pile center. When installing, first screw the matching nut to one end of the tie rod, insert it into the connecting hole of the node plate on the inverted suspension beam, and then screw on the nut at the other end. Use a torque wrench to tighten the nut according to the designed torque. After the nut is tightened, spot weld it to fix it.

9. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 8 is characterized in that: The connection structure between the main beam and the tie rod includes: Reinforcement plates and positioning ear plates are welded on the flange plates of the main beam. The material of the reinforcement plates and positioning ear plates is S275 steel plate. The thickness of the S275 steel plate is 12mm. A stiffening plate is welded on the side where the main beam and the tie rod intersect. The reinforcement structure of the main beam includes: reinforcing steel plates are added to the upper and lower wing plates of the main beam at the mid-span of the secondary beam, stiffening ribs are set at the connection nodes between the main beam and the counter-suspended beam and the secondary beam, the reinforcing steel plates and stiffening ribs are all made of 12mm thick S275 steel plates, and the stiffening ribs are connected to the web and flange plates of the main beam by fillet welds with a weld height of 12mm.

10. The multi-stable offshore large-span cast-in-place inverted support system structure according to claim 9 is characterized in that: The connection structure between the secondary beam and the main beam includes: adding a 12mm reinforcing plate at the connection between the main beam and the secondary beam. The reinforcing plate is made of S275 steel and has a larger size than the contact surface between the secondary beam and the main beam. The reinforcing plate is connected to the flange plate of the main beam and the secondary beam with 8.8-grade M20 bolts. The number of connecting bolts between each reinforcing plate and the main beam and the secondary beam is not less than 4. During construction, first use a magnetic drill to drill holes in the reinforcing plate and the beam flange plate. The drill diameter is 1.5mm larger than the nominal diameter of the bolt, and the hole position deviation is controlled within ±1mm.

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