Precast beam plate type fan foundation and construction method thereof

Abstract

The invention discloses a precast beam plate type fan foundation and a construction method thereof. The precast beam plate type fan foundation comprises a foundation plate, a foundation ring and a plurality of ribbed beams. The foundation ring is mounted in the center of the inner ring; the foundation plate is formed by fixedly splicing an inner ring, a middle ring and an outer ring; the ribbed beam is composed of profile steel, longitudinal steel bars arranged on the profile steel, stirrups arranged on the longitudinal steel bars and concrete poured outside. An inner pre-stress ring is arranged on the inner ring, a middle pre-stress ring is arranged on the middle ring, and an outer pre-stress ring is arranged on the outer ring; a plurality of radial prestressed steel wires penetrating through the inner ring, the middle ring and the outer ring are arranged on the foundation plate; the construction method comprises foundation plate construction, foundation ring construction and ribbed beam construction. According to the foundation, a large amount of concrete pouring operation on site is avoided, the site workload is reduced, the construction period is shortened, the whole foundation has high bending resistance, durability and fatigue resistance, and construction operation is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of fan installation foundation structures, and in particular to a prefabricated beam-slab type fan foundation and a construction method thereof. Background Art

[0002] The foundation of a wind turbine is a concrete structure used to fix the unit. It not only has to bear the weight of the unit and the tower, but also has to resist the maximum overturning load of the unit to ensure the safe operation of the unit under various loads. The traditional wind turbine foundation usually adopts a pedestal foundation, in which a section of the tower (foundation ring) is buried in the pedestal foundation. When the unit is installed, the tower flange and the foundation ring flange are connected. The foundation construction needs to be cast on site as a whole. This method requires on-site steel bar binding, formwork support, concrete curing and other work, which takes a lot of time; the accuracy of on-site lofting and formwork support is difficult to guarantee, and because the wind farms are located in remote mountainous areas, the transportation distance is long, and the transportation conditions are poor, commercial concrete cannot be used for concrete, and on-site mixing is usually used. This causes the quality of mixed concrete to be affected by many factors, making it difficult to guarantee the quality of mixed concrete. The invention patent with the authorization announcement number CN111411642B discloses a rib-beam type wind turbine foundation, comprising: a foundation ring; a prefabricated module surrounding the foundation ring and fixedly connected to the foundation ring; wherein the prefabricated module comprises a plurality of convex prefabricated modules and a plurality of concave prefabricated modules alternately arranged along the circumference of the foundation ring. The present invention reduces the proportion of wet operations, shortens the construction period of the wind turbine foundation during the installation of the wind turbine, and can save energy and protect the environment, but the structure is to separate the rib beam from the bottom plate as a whole, which is heavy and inconvenient for transportation and on-site installation. Summary of the invention

[0003] The purpose of the present invention is to provide a prefabricated beam-slab fan foundation and a construction method thereof, which avoids a large amount of concrete pouring operations on site, reduces the workload on site, shortens the construction period, has strong bending resistance, durability and fatigue resistance as a whole, and is convenient for construction operations.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A prefabricated beam-slab wind turbine foundation comprises a foundation plate, a foundation ring fixedly arranged on the top of the foundation plate and a plurality of rib beams obliquely arranged between the foundation plate and the foundation ring, wherein the foundation plate is formed by fixedly splicing an inner ring, a middle ring and an outer ring, the inner ring is formed by splicing a plurality of inner monomers, the middle ring is formed by splicing a plurality of middle monomers, and the outer ring is formed by splicing a plurality of outer monomers; the foundation ring is installed at the center of the inner ring; the rib beams are composed of steel sections, longitudinal steel bars arranged on the steel sections, stirrups arranged on the longitudinal steel bars and concrete poured on the outside; an inner prestressed ring is arranged on the inner ring, a middle prestressed ring is arranged on the middle ring, and an outer prestressed ring is arranged on the outer ring; a plurality of radial prestressed steel wires penetrating the inner ring, the middle ring and the outer ring are arranged on the foundation plate.

[0005] Preferably, the vertical section of the inner monomer is in an inverted T shape; stepped connecting parts are arranged on both sides of the vertical part of the inner monomer, and the axial positions of two adjacent inner monomers are limited by the stepped connecting parts.

[0006] Preferably, a transition steel ring is fixedly mounted on the outer side of the base ring, and one end of the rib beam is fixedly mounted on the transition steel ring.

[0007] Preferably, the middle ring is fixedly connected to the inner ring and the outer ring via a clamping piece; and clamping holes matching the clamping piece are provided on the inner ring, the middle ring and the outer ring.

[0008] Preferably, the clamping piece is in the shape of a double trapezoid with large ends and a small middle.

[0009] Preferably, a plurality of right-angle connectors are arranged on the top of the vertical portion of the inner monomer, and the other ends of the plurality of right-angle connectors are fixedly connected to the base ring.

[0010] Preferably, an inner pipe is pre-buried in the inner ring, and the two ends of the inner pipe obliquely cross and penetrate the upper surface of the inner ring, and the inner prestressed ring is installed in the inner pipe; a middle pipe is pre-buried in the middle ring, and the two ends of the middle pipe obliquely cross and penetrate the upper surface of the middle ring, and the middle prestressed ring is installed in the middle pipe; an outer pipe is pre-buried in the outer ring, and the two ends of the outer pipe obliquely cross and penetrate the upper surface of the outer ring, and the outer prestressed ring is installed in the outer pipe.

[0011] A construction method for a prefabricated beam-slab type fan foundation, the construction method comprising the following steps: Step 1: Construction of foundation plate: construct a foundation platform in the construction area, transport the prefabricated inner ring, middle ring and outer ring to the construction site, and assemble them on site according to the specified position and angle; after installation, install the inner prestressed ring, middle prestressed ring, outer prestressed ring and multiple radial prestressed steel wires, and finally apply prestress uniformly; Step 2: Install the foundation ring. Transport the foundation ring to the construction site, hoist it onto the inner ring completed in the previous step, adjust the relative angle between the foundation ring and the inner ring, and fix the foundation ring and the inner ring together through a right-angle connector. Step three, rib beam construction, install the two ends of the rib beam on the foundation ring and the foundation plate respectively, adjust the position of each rib beam and temporarily fix it, check the installation position of each rib beam to a qualified state, and tighten it by welding or bolting.

[0012] In the present invention, in this construction, the operation mode of prefabricated structure and on-site construction is adopted, which improves the overall construction period, splits each structure into several units, can reduce the size, volume and weight of the components, greatly reduces the difficulty of component transportation and hoisting, and improves the flexibility of the operation. The set foundation plate evenly transfers the force transmitted by the upper structure to the foundation soil, and it has a large area to disperse the load and ensure the stability of the foundation. The rib beam enhances the spatial stability of the connection between the foundation plate and the foundation ring, effectively resists the bending moment, and more effectively transfers the upper load to other parts of the foundation. The rib beam is assembled on-site, which can adapt to certain installation errors and facilitate on-site operations.

[0013] The inner prestressed ring, the middle prestressed ring, the outer prestressed ring and the radial prestressed steel wire are provided to apply prestress after the foundation plate is assembled, so that the foundation plate has strong structural stability and is convenient for force transmission.

[0014] The construction method can quickly carry out on-site construction of the foundation of the wind turbine, avoiding the problem of remote construction site affecting the construction period and construction quality. Prefabricated components are produced and processed in the factory, which is not restricted by the climate, site and other conditions of the construction site, and can be operated in parallel with other on-site construction processes. During on-site assembly, only the prefabricated components need to be assembled and prestressed, without wet operation process, which not only guarantees the construction quality but also shortens the construction time. The factory-produced prefabricated components adopt standardized production processes and quality inspection processes, and can strictly control the quality of raw materials, concrete mix ratio, steel bar processing and installation, thereby effectively ensuring the overall quality of the wind turbine foundation and reducing the risk of wind turbine operation failure or safety accidents caused by foundation quality problems. Prefabrication and assembly construction reduces dust, noise and other pollution generated by on-site concrete mixing, pouring and other operations, and reduces the amount of construction waste generated at the construction site. In addition, due to the shortened construction period, energy consumption during the construction process is reduced, which is in line with the concept of green building and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the monomer structure of the present invention; Figure 3It is a top view schematic diagram of the arrangement of the prestressed ring of the present invention; In the figure: 1. base plate; 2. base ring; 3. rib beam; 4. clamping piece; 5. connecting bolt; 6. connecting plate; 7. right-angle connecting piece; 8. transition steel ring; 10. inner ring; 11. middle ring; 12. outer ring; 13. stepped connection; 14. inner prestressed ring; 15. middle prestressed ring; 16. outer prestressed ring; 17. radial prestressed steel wire. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1 , Figure 2 and Figure 3 A prefabricated beam-slab type wind turbine foundation shown in the figure comprises a foundation plate 1, a foundation ring 2 fixedly arranged on the top of the foundation plate 1, and a plurality of rib beams 3 obliquely arranged between the foundation plate 1 and the foundation ring 2. The foundation plate 1 is formed by the inner ring 10, the middle ring 11 and the outer ring 12 fixedly spliced ​​together. When the volume of the foundation plate 1 is large, multiple layers of the middle ring 11 can be provided. The inner ring 10 is formed by the splicing of a plurality of inner monomers, the middle ring 11 is formed by the splicing of a plurality of middle monomers, and the outer ring 12 is formed by the splicing of a plurality of outer monomers. The inner monomers, the middle monomers and the outer monomers are all reinforced concrete prefabricated components. The reinforced concrete prefabricated components are prefabricated in advance in the factory before construction.

[0017] An inner prestressed ring 14 is provided on the inner ring 10, a middle prestressed ring 15 is provided on the middle ring 11, and an outer prestressed ring 16 is provided on the outer ring 12. Specifically, an inner pipe is pre-buried in the inner ring 10, and the ends of the inner pipe cross obliquely and pass through the upper surface of the inner ring 10. After multiple inner monomers are spliced ​​into the inner ring 10, multiple corresponding middle pipes are closed, and the inner prestressed ring 14 is installed in the inner pipe, and prestress is applied to the ends and blocked. A middle pipe is pre-buried in the middle ring 11, and the ends of the middle pipe cross obliquely and pass through the upper surface of the middle ring 11. After multiple middle monomers are spliced ​​into the middle ring 11, multiple corresponding middle pipes are closed, and the middle prestressed ring 15 is installed in the middle pipe, and prestress is applied to the ends and blocked.

[0018] An outer pipe is pre-buried in the outer ring 13, and both ends of the outer pipe are inclined and cross-passed through the upper surface of the outer ring 13. After multiple outer monomers are spliced ​​into the outer ring 12, multiple corresponding outer pipes are closed, and an outer prestressed ring 16 is installed in the outer pipe, and prestress is applied to the end and sealed.

[0019] A plurality of radial prestressed steel wires 17 are provided on the base plate 1, penetrating the inner ring 10, the middle ring 11 and the outer ring 12. Specifically, radial through holes are provided at corresponding positions of the inner ring 10, the middle ring 11 and the outer ring 12, and the radial prestressed steel wires 17 are installed in the corresponding radial through holes, and prestress is applied to the radial prestressed steel wires 17. Thus, the prestressing of the base plate 1 is completed, and its durability and service life are improved.

[0020] The vertical section of the inner monomer is in an inverted T-shape; a stepped connection part 13 is provided on both sides of the vertical part of the inner monomer, and the axial position of two adjacent inner monomers is limited by the stepped connection part 13. The middle ring 11 is fixedly connected with the inner ring 10 and the outer ring 12 through the clamping part 4; the inner ring 10, the middle ring 11 and the outer ring 12 are provided with a clamping hole adapted to the clamping part 4, and after the two corresponding clamping holes are spliced, the clamping part 4 is installed therein to realize the fixed connection of the adjacent inner ring 10 and the middle ring 11 or the middle ring 11 and the outer ring 12. In a preferred embodiment, the clamping part 4 is a double trapezoidal structure with large ends and small middle, and of course it can also be dumbbell-shaped. A connection platform is fixedly provided on the top side of the inner monomer, and a connection bolt 5 is provided on the connection platform. The two connected inner monomers are connected by a plurality of connection plates 6 to connect the corresponding two connection bolts 5. The connection plate 6 is provided with a waist-shaped hole, which can adapt to a certain installation error and facilitate on-site construction.

[0021] The base ring 2 is installed at the center of the inner ring 10, and a plurality of right-angle connectors 7 are arranged at the top of the vertical part of the inner monomer, and the other ends of the plurality of right-angle connectors 7 are fixedly connected to the base ring 2. Specifically, a plurality of anchor plates are pre-embedded at the top of the vertical part of the inner monomer, and the right-angle connectors 7 are fixedly installed on the anchor plates by welding or bolts, and a plurality of anchor bolts are pre-embedded on the side of the base ring 2, and the other ends of the right-angle connectors 7 are fixedly connected to the anchor bolts.

[0022] The rib beam 3 is composed of steel sections, a plurality of longitudinal steel bars arranged around the steel sections, stirrups fixedly arranged on the longitudinal steel bars, and concrete poured on the outside. The steel sections can be made of I-beams, cross-shaped steels, or steel materials with other cross-sectional shapes. After the production is completed, the steel sections are exposed at both ends of the rib beam 3 to facilitate fixation with the base plate 1 and the base ring 2. Of course, in order to facilitate connection, steel plates or steel blocks are fixedly installed at both ends of the rib beam 3 to facilitate welding and fixation with the base plate 1 and the base ring 2. In a preferred embodiment, a transition steel ring 8 is fixedly installed on the outside of the base ring 2, and one end of the rib beam 3 is fixedly installed on the transition steel ring 8 by welding. Of course, the steel plate for connection with the rib beam 3 can also be pre-buried when the base ring 2 is cast.

[0023] like Figure 1 , Figure 2 and Figure 3 A construction method of a prefabricated beam-slab type wind turbine foundation is shown, and the construction method comprises the following steps: Step 1: Construction of the foundation plate 1. A foundation platform is constructed in the area to be constructed. The prefabricated inner ring 10, middle ring 11 and outer ring 12 are transported to the construction site and assembled on site according to the specified position and angle. After installation, the whole is adjusted to make the upper surface of the foundation plate 1 flush. After installation, the inner prestressed ring 14, the middle prestressed ring 15, the outer prestressed ring 16 and the plurality of radial prestressed steel wires 17 are installed, and finally the prestress is uniformly applied.

[0024] Step 2: Install the base ring 2. Transport the base ring 2 to the construction site, hoist it onto the top of the inner ring 10 completed in the previous step, adjust the relative angle between the base ring 2 and the inner ring 10, and fix the base ring 2 and the inner ring 10 together through the right-angle connector 7.

[0025] Step three, construct the rib beam 3, install the two ends of the rib beam 3 on the foundation ring 2 and the foundation plate 1 respectively, adjust the position of each rib beam 3 and temporarily fix it, check the installation position of each rib beam 3 to see if it is in a qualified state, and tighten it by welding or bolting.

[0026] The above embodiments are only some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A prefabricated beam-slab type wind turbine foundation, comprising a foundation plate, a foundation ring fixedly arranged on the top of the foundation plate, and a plurality of rib beams obliquely arranged between the foundation plate and the foundation ring, characterized in that: The base plate is formed by fixedly splicing an inner ring, a middle ring and an outer ring, the inner ring is formed by splicing a plurality of inner monomers, the middle ring is formed by splicing a plurality of middle monomers, and the outer ring is formed by splicing a plurality of outer monomers; the base ring is installed at the center of the inner ring; the rib beam is composed of steel sections, longitudinal steel bars arranged on the steel sections, stirrups arranged on the longitudinal steel bars and concrete poured on the outside; an inner prestressed ring is arranged on the inner ring, a middle prestressed ring is arranged on the middle ring, and an outer prestressed ring is arranged on the outer ring; a plurality of radial prestressed steel wires penetrating the inner ring, the middle ring and the outer ring are arranged on the base plate.

2. The prefabricated beam-slab type wind turbine foundation according to claim 1 is characterized in that: The vertical section of the inner monomer is in an inverted T shape; stepped connecting parts are arranged on both sides of the vertical part of the inner monomer, and the axial positions of two adjacent inner monomers are limited by the stepped connecting parts.

3. The prefabricated beam-slab type wind turbine foundation according to claim 1 is characterized in that: A transition steel ring is fixedly installed on the outer side of the base ring, and one end of the rib beam is fixedly installed on the transition steel ring.

4. The prefabricated beam-slab type wind turbine foundation according to claim 1 or 2, characterized in that: The middle ring is fixedly connected to the inner ring and the outer ring through a clamping piece; clamping holes matched with the clamping piece are arranged on the inner ring, the middle ring and the outer ring.

5. The prefabricated beam-slab type wind turbine foundation according to claim 4 is characterized in that: The clamping piece is in the shape of a double trapezoid with large ends and a small middle.

6. The prefabricated beam-slab type wind turbine foundation according to claim 2, characterized in that: A plurality of right-angle connectors are arranged on the top of the vertical portion of the inner monomer, and the other ends of the plurality of right-angle connectors are fixedly connected to the base ring.

7. The prefabricated beam-slab type wind turbine foundation according to claim 1 or 6, characterized in that: An inner pipe is pre-buried in the inner ring, and two ends of the inner pipe obliquely cross and penetrate the upper surface of the inner ring, and the inner prestressed ring is installed in the inner pipe; a middle pipe is pre-buried in the middle ring, and two ends of the middle pipe obliquely cross and penetrate the upper surface of the middle ring, and the middle prestressed ring is installed in the middle pipe; an outer pipe is pre-buried in the outer ring, and two ends of the outer pipe obliquely cross and penetrate the upper surface of the outer ring, and the outer prestressed ring is installed in the outer pipe.

8. A construction method for a prefabricated beam-slab type fan foundation according to any one of claims 1 to 7, characterized in that: The construction method comprises the following steps: Step 1: Construction of foundation plate: construct a foundation platform in the construction area, transport the prefabricated inner ring, middle ring and outer ring to the construction site, and assemble them on site according to the specified position and angle; after installation, install the inner prestressed ring, middle prestressed ring, outer prestressed ring and multiple radial prestressed steel wires, and finally apply prestress uniformly; Step 2: Install the foundation ring. Transport the foundation ring to the construction site, hoist it onto the inner ring completed in the previous step, adjust the relative angle between the foundation ring and the inner ring, and fix the foundation ring and the inner ring together through a right-angle connector. Step three, rib beam construction, install the two ends of the rib beam on the foundation ring and the foundation plate respectively, adjust the position of each rib beam and temporarily fix it, check the installation position of each rib beam to a qualified state, and tighten it by welding or bolting.

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