An assembled prestressed steel-concrete hybrid tower structure and construction method

Abstract

The present invention provides a prefabricated prestressed steel-concrete hybrid tower structure and a construction method. The structure is fixedly connected by a prefabricated concrete tower barrel at the lower part and a variable-section tower at the upper part; the variable-section tower is fixedly connected by an upper variable-section truss, a middle constant-section truss and a lower variable-section truss; an external prestressed cable is fixedly connected between the top of the upper variable-section truss and the top of the prefabricated concrete tower barrel. At the same time, a buried part is embedded at the top of the prefabricated concrete tower barrel, and the buried part is fixedly connected with the bottom of the lower variable-section truss. The present invention adopts a hybrid tower composed of a concrete tower barrel and a steel structure tower, which not only reduces the self-weight of the structure, is convenient for transportation, but also reduces the manufacturing cost. In addition, an external prestressed cable is added between the concrete tower barrel and the variable-section tower in the present invention, so that a prestressed integral tower is formed between the prefabricated concrete tower barrel and the variable-section tower.

Description

Technical Field

[0001] The present invention relates to a prefabricated prestressed steel-concrete hybrid tower structure and a construction method, belonging to the technical field of wind power towers. Background Art

[0002] The development of humanity and the progress of society are inseparable from energy. Chemical / fossil fuels such as oil, coal, and natural gas are used to produce energy. However, these fuels are non-renewable resources and can cause serious environmental problems. To overcome the current energy crisis and achieve the carbon neutrality goal, wind energy is one of the most promising clean and renewable energy sources and has been widely used worldwide. The wind power tower is supported by a tubular steel tower. To improve the market competitiveness and maximize the power generation efficiency of wind turbines, it is necessary to increase the hub height and blade length, which will significantly increase the self-weight of the tower and the total load borne by the tower. Traditionally, tubular steel towers have been used as the support structure for wind turbines. However, with the increase in the hub height and self-weight of the tower barrel, to improve the stiffness and stability of the tower barrel, it is necessary to use steel pipes with larger diameters and thicknesses, which increases the material and transportation costs and reduces its market competitiveness.

[0003] To overcome the limitations of steel pipe towers and problems such as resonance, buckling, and weak stiffness of large-height traditional steel pipe towers, new types of configured tower structures that combine the advantages of steel and concrete towers have been proposed, such as concrete-filled steel tube structures and steel-concrete hybrid structures. The hybrid tower composed of a lower prestressed concrete tower and an upper steel tower in the steel-concrete hybrid structure is widely used in the support of high-power wind turbines due to its large bearing capacity and low cost. To ensure the rapid construction of wind farms, the lower concrete tower is a prefabricated assembled structure and is transported to the site for assembly. After each precast concrete segment is assembled together along the circumferential direction, the concrete segments are then vertically assembled to form a concrete tower. However, there are still some problems with the steel-concrete hybrid structure products on the market currently:

[0004] 1) The production of existing conical concrete tower segments requires multiple sets of molds;

[0005] 2) The size of the concrete tower segments is large, and the transportation process of the tower segments is still difficult;

[0006] 3) In the assembly process of the concrete tower segments, the connection between the tower segments is not anchored;

[0007] 4) The steel tower segments still use traditional tubular steel towers, with high material and transportation costs;

[0008] 5) The steel tower segments still use tubular steel towers, and the upper structure has a large self-weight;

[0009] 6) The tubular steel tower of the steel tower segment within the blade scanning range hinders the cut-out wind speed of the blade;

[0010] 7) The connection between the steel tower section and the mixed tower section is complex and the structural integrity is poor. Summary of the invention

[0011] In view of the deficiencies in the prior art, the present invention proposes an assembled prestressed steel-concrete hybrid tower structure and a construction method which have low cost, light weight, good rigidity and stability, and simple assembly.

[0012] The technical solution of the present invention is an assembled prestressed steel-concrete hybrid tower structure, which is formed by fixedly connecting a lower assembled concrete tower and an upper variable-section tower.

[0013] Furthermore, the variable-section tower is formed by fixedly connecting an upper variable-section truss, a middle constant-section truss and a lower variable-section truss.

[0014] Furthermore, an external prestressed cable is fixedly connected between the top of the upper variable-section truss and the top of the assembled concrete tower, and an embedded part is pre-embedded in the top of the assembled concrete tower, and the embedded part is fixedly connected to the bottom of the lower variable-section truss.

[0015] Furthermore, the upper variable-section truss, the middle constant-section truss and the lower variable-section truss each include four angle steel towers, a group of cross bars are fixedly connected from bottom to top between adjacent angle steel towers, and two diagonal bars are symmetrically fixedly connected between upper and lower adjacent cross bars.

[0016] Furthermore, the end sides of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss are all provided with reinforcing columns, which are arranged on the symmetry lines of adjacent angle steel tower columns, and are fixedly connected to more than two cross bars at the same time.

[0017] Furthermore, planar cross-frames are fixed on the end faces of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss, node plates are fixedly connected to the planar cross-frames, and adjacent trusses are fixedly connected by node plates and bolts.

[0018] Furthermore, the crossbar is fixedly connected to the angle steel tower column, the diagonal bar or the reinforcement column via a node plate and bolts.

[0019] Furthermore, the assembled concrete tower is formed by connecting more than two sections of single concrete cylinders, and the single concrete cylinder is a square cylinder structure composed of four concrete flat plates and concrete arc-shaped plates installed between adjacent concrete flat plates.

[0020] Furthermore, a set of horizontal anchor holes are provided on both the left and right sides of the concrete slab and the concrete arc-shaped slab, and the concrete slab and the concrete arc-shaped slab are fixedly connected by horizontal anchor bolts inserted into the horizontal anchor holes; a set of vertical anchor holes are provided at both the upper and lower ends of the concrete slab and the concrete arc-shaped slab, and adjacent single concrete cylinders are fixedly connected by vertical anchor bolts inserted into the vertical anchor holes.

[0021] Furthermore, self-compacting concrete is poured into both the horizontal anchor holes and the vertical anchor holes.

[0022] Furthermore, a cement base slurry is filled between adjacent single concrete cylinders; an epoxy splicing adhesive is filled between adjacent concrete slabs and concrete arc-shaped slabs.

[0023] Meanwhile, the present invention also provides a construction method for the above-mentioned prefabricated prestressed steel-concrete hybrid tower structure, including the following steps:

[0024] Step 1: First, connect the concrete slab and the concrete arc-shaped slab through horizontal anchor bolts to form a single concrete cylinder, and then connect two or more single concrete cylinders together through vertical anchor bolts to form a prefabricated concrete tower barrel.

[0025] Step 2: Hoist the lower variable cross-section truss to the top of the prefabricated concrete tower barrel, and fixedly connect the bottom of the lower variable cross-section truss to the embedded parts at the top of the prefabricated concrete tower barrel.

[0026] Step 3: Hoist the middle constant cross-section truss and the upper variable cross-section truss onto the lower variable cross-section truss in sequence, and fixedly connect the three of them together to form a variable cross-section tower.

[0027] Step 4: Fix and connect an external prestressed cable between the top of the upper variable cross-section truss and the top of the prefabricated concrete tower barrel, so that a prestressed integral tower is formed between the prefabricated concrete tower barrel and the variable cross-section tower.

[0028] Due to the adoption of the above technical solutions, the advantages of the present invention are as follows:

[0029] 1. The present invention adopts a hybrid tower composed of a concrete tower barrel and a steel structure tower, which not only reduces the structural self-weight, is convenient for transportation, but also reduces the manufacturing cost.

[0030] 2. The prefabricated concrete tower barrel in the present invention is composed of two structures, namely a concrete slab and a concrete arc-shaped slab, and can be manufactured with two sets of molds, which not only saves production costs, but also is convenient for assembly.

[0031] 3. The prefabricated concrete tower barrel and the variable cross-section tower in the present invention can be disassembled into several small-size single pieces, which is convenient for transportation.

[0032] 4. An external prestressed cable is added between the concrete tower barrel and the variable cross-section tower frame in the present invention, so that an integral tower frame with prestress is formed between the prefabricated concrete tower barrel and the variable cross-section tower frame, ensuring that the stiffness and strength of the tower frame can meet the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional schematic diagram of the full assembly of the present invention;

[0034] Figure 2 It is an elevation schematic diagram of the full assembly of the present invention;

[0035] Figure 3 It is an elevation schematic diagram of the assembly of the variable cross-section tower frame;

[0036] Figure 4 It is an isometric schematic diagram of the assembly of the variable cross-section tower frame;

[0037] Figure 5 It is a schematic diagram of the upper variable cross-section truss structure;

[0038] Figure 6 It is a schematic diagram of the middle constant cross-section truss structure;

[0039] Figure 7 It is a schematic diagram of the lower variable cross-section truss structure;

[0040] Figure 8 It is a partial schematic diagram of the lower variable cross-section truss;

[0041] Figure 9 It is a connection schematic diagram of the middle constant cross-section truss and the lower variable cross-section truss;

[0042] Figure 10 It is a connection schematic diagram of the upper variable cross-section truss and the middle constant cross-section truss;

[0043] Figure 11 It is a schematic diagram of the structure of the plane diaphragm frame.

[0044] Figure 12 It is a connection schematic diagram of the variable cross-section tower frame and the prefabricated concrete tower barrel.

[0045] Figure 13 It is an isometric schematic diagram of the prefabricated concrete tower barrel.

[0046] Figure 14 It is a schematic diagram of the structure of adjacent single concrete cylinders.

[0047] Figure 15 It is a connection schematic diagram of adjacent single concrete cylinders.

[0048] Figure 16 It is a schematic diagram of the structure of a single concrete cylinder.

[0049] Figure 17 It is an explosion schematic diagram of a single concrete cylinder.

[0050] Figure 18 It is a structural schematic diagram of a concrete slab.

[0051] Figure 19 It is an explosion schematic diagram of a concrete slab.

[0052] Figure 20 It is a front view structural schematic diagram of a concrete arc slab.

[0053] Figure 21 It is a rear view structural schematic diagram of a concrete arc slab.

[0054] Figure 22 It is an explosion schematic diagram of a concrete arc slab.

[0055] Explanation of reference numerals: 1 - variable cross-section tower, 2 - precast concrete tower barrel, 3 - tower column, 4 - diagonal rod, 5 - strengthening column, 6 - cross bar, 7 - external prestressed cable, 8 - plane diaphragm frame, 9 - gusset plate, 10 - embedded part, 11 - concrete slab, 12 - concrete arc slab, 13 - vertical anchor bolt, 14 - horizontal anchor bolt, 15 - cement base slurry, 16 - epoxy splicing adhesive, 17 - self-compacting concrete, 18 - vertical anchor hole, 19 - horizontal anchor hole. Detailed implementation mode

[0056] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0057] Embodiment

[0058] The schematic diagram of the precast prestressed steel-concrete hybrid tower structure of the present invention is as shown in Figure 1 and Figure 2 shown. This structure is fixedly connected by the precast concrete tower barrel 2 at the lower part and the variable cross-section tower 1 at the upper part.

[0059] See Figure 3 and Figure 4 , the variable cross-section tower 1 is fixedly connected by an upper variable cross-section truss, a middle constant cross-section truss and a lower variable cross-section truss. Among them, the cross-sectional area of the upper variable cross-section truss gradually increases from top to bottom, and the cross-sectional area at its maximum is the same as that of the middle constant cross-section truss; the cross-sectional area of the lower variable cross-section truss gradually decreases from top to bottom, and the cross-sectional area at its maximum is the same as that of the middle constant cross-section truss. Therefore, due to the structure form of the variable cross-section tower 1 with small ends and large middle, its deflection is small, the anti-deformation ability is stronger, and the stability is better.

[0060] An external prestressed cable 7 is fixedly connected between the top of the upper variable-section truss and the top of the precast concrete tower barrel 2. At the same time, a buried part 10 is embedded at the top of the precast concrete tower barrel 2, and the buried part 10 has a lap joint with sufficient strength with the internal steel bars of the precast concrete tower barrel 2. The buried part 10 is fixedly connected to the bottom of the lower variable-section truss.

[0061] See Figures 5 to 12 , the upper variable-section truss, the middle constant-section truss, and the lower variable-section truss all include four angle steel tower columns 3. A group of cross bars 6 are fixedly connected between adjacent angle steel tower columns 3 from bottom to top, and two diagonal bars 4 are symmetrically fixedly connected between adjacent upper and lower cross bars 6.

[0062] Reinforcing columns 5 are arranged on the end side surfaces of the upper variable-section truss, the middle constant-section truss, and the lower variable-section truss. The reinforcing columns 5 are arranged on the symmetry lines of adjacent angle steel tower columns 3, and the reinforcing columns 5 are fixedly connected to more than two cross bars 6 at the same time. Plane diaphragms 8 are fixedly installed on the end surfaces of the upper variable-section truss, the middle constant-section truss, and the lower variable-section truss. Gusset plates 9 are fixedly connected to the plane diaphragms 8, and adjacent trusses are fixedly connected by bolts through the gusset plates 9. Therefore, the connection strength between the upper variable-section truss, the middle constant-section truss, and the lower variable-section truss is improved through the reinforcing columns 5 and the plane diaphragms 8.

[0063] The cross bar 6 is fixedly connected to the angle steel tower column 3, the diagonal bar 4, or the reinforcing column 5 through a gusset plate 9 and a bolt, so as to achieve full prefabricated connection.

[0064] See Figures 13 to 22 , the precast concrete tower barrel 2 is formed by connecting two or more single concrete barrels. The single concrete barrel is a square barrel structure composed of four concrete flat plates 11 and concrete arc-shaped plates 12 installed between adjacent concrete flat plates 11.

[0065] A group of horizontal anchor holes 19 are opened on the left and right sides of the concrete flat plate 11 and the concrete arc-shaped plate 12. The concrete flat plate 11 and the concrete arc-shaped plate 12 are fixedly connected through horizontal anchor bolts 14 inserted into the horizontal anchor holes 19; a group of vertical anchor holes 18 are opened at the upper and lower ends of the concrete flat plate 11 and the concrete arc-shaped plate 12. Adjacent single concrete barrels are fixedly connected through vertical anchor bolts 13 inserted into the vertical anchor holes 18.

[0066] Self-compacting concrete 17 is poured into the horizontal anchor holes 19 and the vertical anchor holes 18 to strengthen the connection strength between the anchor bolts and the anchor holes.

[0067] A cement base slurry 15 is filled between adjacent monomer concrete cylinders to enhance the connection strength between the monomer concrete cylinders, provide additional support and stability, and give full play to the compactness and stability of the structure. At the same time, an epoxy splicing adhesive 16 is filled between adjacent concrete slabs 11 and concrete arc-shaped plates 12, which can make the connection between the concrete slabs 11 and the concrete arc-shaped plates 12 more firm and enhance the overall stiffness and strength of the structure.

[0068] The present invention also provides a construction method for the above-mentioned assembled prestressed steel-concrete hybrid tower structure, including the following steps:

[0069] Step 1: First, connect the concrete slab 11 and the concrete arc-shaped plate 12 through the transverse anchor bolts 14 to form a monomer concrete cylinder, and then connect two or more sections of the monomer concrete cylinders together through the vertical anchor bolts 13 to form an assembled concrete tower cylinder 2;

[0070] Step 2: Hoist the lower variable-section truss to the top of the assembled concrete tower cylinder 2, and fixedly connect the bottom of the lower variable-section truss with the embedded part 10 at the top of the assembled concrete tower cylinder 2;

[0071] Step 3: Hoist the middle constant-section truss and the upper variable-section truss onto the lower variable-section truss in sequence, and fixedly connect the three of them together to form a variable-section tower truss 1;

[0072] Step 4: Fix and connect an external prestressed cable 7 between the top of the upper variable-section truss and the top of the assembled concrete tower cylinder 2, so as to form an integral tower truss with prestress between the assembled concrete tower cylinder 2 and the variable-section tower truss 1.

[0073] To sum up, the present invention adopts a hybrid tower truss composed of a concrete tower cylinder and a steel structure tower truss, which not only reduces the self-weight of the structure, is convenient for transportation, but also reduces the manufacturing cost. In addition, the assembled concrete tower cylinder 2 and the variable-section tower truss 1 in the present invention can be disassembled into several small-size single pieces, which is convenient for transportation. Moreover, the present invention adds an external prestressed cable 7 between the concrete tower cylinder 2 and the variable-section tower truss 1, so as to form an integral tower truss with prestress between the assembled concrete tower cylinder 2 and the variable-section tower truss 1, ensuring that the stiffness and strength of the tower truss can meet the design requirements.

Claims

1. An assembled prestressed steel-concrete hybrid tower structure, characterized in that: This structure is fixedly connected by a prefabricated concrete tower barrel (2) at the lower part and a variable cross-section tower frame (1) at the upper part; the variable cross-section tower frame (1) is fixedly connected by an upper variable cross-section truss, a middle constant cross-section truss, and a lower variable cross-section truss; an external prestressed cable (7) is fixedly connected between the top of the upper variable cross-section truss and the top of the prefabricated concrete tower barrel (2), and at the same time, a buried part (10) is embedded at the top of the prefabricated concrete tower barrel (2), and the buried part (10) is fixedly connected to the bottom of the lower variable cross-section truss; the cross-sectional area of the upper variable cross-section truss gradually increases from top to bottom, and the cross-sectional area at its maximum is the same as that of the middle constant cross-section truss; the cross-sectional area of the lower variable cross-section truss gradually decreases from top to bottom, and the cross-sectional area at its maximum is the same as that of the middle constant cross-section truss.

2. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 1, wherein: The upper variable cross-section truss, the middle constant cross-section truss, and the lower variable cross-section truss all include four angle steel tower columns (3), and a group of cross bars (6) are fixedly connected between adjacent angle steel tower columns (3) from bottom to top, and two diagonal bars (4) are symmetrically fixedly connected between adjacent upper and lower cross bars (6).

3. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 2, characterized in that: Reinforcing columns (5) are arranged on the end side surfaces of the upper variable cross-section truss, the middle constant cross-section truss, and the lower variable cross-section truss. The reinforcing columns (5) are arranged on the symmetry line of adjacent angle steel tower columns (3), and the reinforcing columns (5) are fixedly connected to more than two cross bars (6) at the same time.

4. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 3, characterized in that: Plane diaphragm frames (8) are fixedly installed on the end surfaces of the upper variable cross-section truss, the middle constant cross-section truss, and the lower variable cross-section truss. Gusset plates (9) are fixedly connected to the plane diaphragm frames (8), and adjacent trusses are fixedly connected by bolts through the gusset plates (9).

5. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 3, wherein: The cross bar (6) is fixedly connected to the angle steel tower column (3), the diagonal bar (4), or the reinforcing column (5) by bolts through a gusset plate (9).

6. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 1, wherein: The prefabricated concrete tower barrel (2) is connected by two or more single concrete cylinders. The single concrete cylinder is a square cylinder structure composed of four concrete flat plates (11) and concrete arc-shaped plates (12) installed between adjacent concrete flat plates (11).

7. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 6, characterized in that: A group of horizontal anchor holes (19) are opened on the left and right sides of the concrete flat plate (11) and the concrete arc-shaped plate (12). The concrete flat plate (11) and the concrete arc-shaped plate (12) are fixedly connected by horizontal anchor bolts (14) inserted into the horizontal anchor holes (19); a group of vertical anchor holes (18) are opened at the upper and lower ends of the concrete flat plate (11) and the concrete arc-shaped plate (12). Adjacent single concrete cylinders are fixedly connected by vertical anchor bolts (13) inserted into the vertical anchor holes (18).

8. The prefabricated prestressed steel-concrete hybrid tower structure according to claim 7, characterized in that: Self-compacting concrete (17) is poured into both the horizontal anchor holes (19) and the vertical anchor holes (18).

9. The prefabricated prestressed steel-concrete hybrid tower structure and construction method according to claim 7, characterized in that: Cement base slurry (15) is filled between adjacent single concrete cylinders; epoxy splicing glue (16) is filled between adjacent concrete flat plates (11) and concrete arc-shaped plates (12).

10. A construction method for the prefabricated prestressed steel-concrete hybrid tower structure according to any one of claims 1 to 9, characterized in that Including the following steps: Step 1: First, connect the concrete flat slab (11) and the concrete circular arc slab (12) through the transverse anchor bolts (14) to form a single concrete cylinder, and then connect two or more single concrete cylinders together through the vertical anchor bolts (13) to form a prefabricated concrete tower barrel (2); Step 2: Hoist the lower variable cross-section truss to the top of the prefabricated concrete tower barrel (2), and fix the bottom of the lower variable cross-section truss to the embedded part (10) at the top of the prefabricated concrete tower barrel (2); Step 3: Hoist the middle constant cross-section truss and the upper variable cross-section truss onto the lower variable cross-section truss in sequence, and fix and connect the three of them together to form a variable cross-section tower frame (1); Step 4: Fix and connect the external prestressed cable (7) between the top of the upper variable cross-section truss and the top of the prefabricated concrete tower barrel (2), so as to form an integral tower frame with prestress between the prefabricated concrete tower barrel (2) and the variable cross-section tower frame (1).

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