Fabricated prestressed steel-concrete mixed tower structure and construction method

Abstract

The invention provides an assembly type prestressed steel-concrete mixed tower structure and a construction method. The structure is formed by fixedly connecting an assembly type concrete tower drum on the lower portion and a variable cross-section tower on the upper portion. The variable cross-section tower is formed by fixedly connecting an upper variable cross-section truss, a middle constant cross-section truss and a lower variable cross-section truss; an external prestressed cable is fixedly connected between the top of the upper portion variable cross-section truss and the top of the assembly type concrete tower drum, and meanwhile an embedded part is embedded in the top of the assembly type concrete tower drum and fixedly connected with the bottom of the lower portion variable cross-section truss. The concrete tower drum and the steel structure tower are combined to form the mixed tower, so that the self weight of the structure is reduced, the transportation is convenient, and the manufacturing cost is reduced. In addition, an external prestressed cable is additionally arranged between the concrete tower drum and the variable-cross-section tower, so that an integral tower with prestress is formed between the fabricated concrete tower drum and the variable-cross-section tower.

Description

Technical Field

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

[0002] Human development and social progress 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 will cause serious environmental problems. In order to overcome the current energy crisis and achieve the goal of carbon neutrality, wind energy is one of the most promising clean and renewable energy sources and has been widely used around the world. Wind power towers are supported by tubular steel towers. In order to improve 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 tower's deadweight and the total load borne by the tower. Traditionally, tubular steel towers have been used as support structures for wind turbines. However, with the increase in the tower hub height and deadweight, in order to improve the stiffness and stability of the tower, larger diameter and thickness steel pipes are required, which increases material and transportation costs and reduces its market competitiveness.

[0003] In order to overcome the limitations of steel tube towers, as well as the resonance, buckling and weak stiffness of traditional steel tube towers of high height, new configuration tower structures that combine the advantages of steel and concrete towers have been proposed, such as steel tube concrete structures and steel-concrete hybrid structures. The hybrid tower composed of a lower prestressed concrete tower frame and an upper steel tower of 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 adopts a prefabricated assembled structure and is transported to the site for assembly. After each prefabricated concrete segment is assembled together in the circumferential direction, the concrete segments are then assembled vertically to form a concrete tower. However, there are still some problems with the steel-concrete hybrid structure products currently on the market:

[0004] 1) The production of existing conical mixed tower segment products requires multiple sets of molds;

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

[0006] 3) During the assembly process of the mixed tower segments, the connections between the tower segments were not anchored;

[0007] 4) The steel tower section still uses traditional tubular steel towers, which has high material and transportation costs;

[0008] 5) The steel tower section still uses a tubular steel tower, and the upper structure is heavy;

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

[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 rod 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 group of transverse anchor holes are provided on the left and right sides of the concrete flat plate and the concrete arc-shaped plate, and the concrete flat plate and the concrete arc-shaped plate are fixedly connected by transverse anchor bolts inserted into the transverse anchor holes; a group of vertical anchor holes are provided on the upper and lower ends of the concrete flat plate and the concrete arc-shaped plate, and adjacent single concrete cylinders are fixedly connected by vertical anchor bolts inserted into the vertical anchor holes.

[0021] Furthermore, the transverse anchor holes and the vertical anchor holes are both poured with self-compacting concrete.

[0022] Furthermore, cement base slurry is filled between adjacent single concrete cylinders; and epoxy splicing glue is filled between adjacent concrete flat plates and concrete arc-shaped plates.

[0023] At the same time, the present invention also provides a construction method for the above-mentioned assembled prestressed steel-concrete hybrid tower structure, comprising the following steps:

[0024] Step 1: firstly, a concrete flat plate and a concrete arc-shaped plate are connected by transverse anchor bolts to form a single concrete cylinder, and then two or more sections of the single concrete cylinder are connected together by vertical anchor bolts to form an assembled concrete tower cylinder;

[0025] Step 2: hoist the lower variable cross-section truss to the top of the assembled concrete tower, and fix the bottom of the lower variable cross-section truss to the embedded parts at the top of the assembled concrete tower.

[0026] Step 3: hoist the middle constant-section truss and the upper variable-section truss onto the lower variable-section truss in sequence, and fix the three together to form a variable-section tower;

[0027] Step 4: Fix and connect the external prestressed cable between the top of the upper variable-section truss and the top of the assembled concrete tower, so that an integral tower frame with prestress is formed between the assembled concrete tower and the variable-section tower.

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

[0029] 1. The present invention adopts a hybrid tower frame formed by combining a concrete tower tube and a steel structure tower frame, which not only reduces the dead weight of the structure and facilitates transportation, but also reduces the manufacturing cost.

[0030] 2. The assembled concrete tower in the present invention is composed of two structures, a concrete flat plate and a concrete arc-shaped plate, and can be manufactured with two sets of molds, which not only saves production costs but also facilitates assembly.

[0031] 3. The assembled concrete tower and the variable-section tower in the present invention can be disassembled into several small-sized pieces for easy transportation.

[0032] 4. The present invention adds an external prestressed cable between the concrete tower and the variable-section tower, so that an integral tower with prestress is formed between the assembled concrete tower and the variable-section tower, ensuring that the rigidity and strength of the tower 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 a schematic elevation diagram of the fully assembled structure of the present invention;

[0035] Figure 3 Schematic diagram of the elevation of the variable cross-section tower assembly;

[0036] Figure 4 A schematic diagram of the axial side of the variable cross-section tower assembly;

[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 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-section truss;

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

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

[0043] Fig.11 It is a structural schematic diagram of the plane cross frame.

[0044] Fig.12 Schematic diagram of the connection between the variable-section tower and the prefabricated concrete tower.

[0045] Fig.13 It is a three-dimensional axial schematic diagram of the prefabricated concrete tower.

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

[0047] Fig.15 Schematic diagram of the connection between adjacent single concrete cylinders.

[0048] Fig.16 Schematic diagram of the structure of a single concrete cylinder.

[0049] Fig.17 Schematic diagram of the explosion of a single concrete cylinder.

[0050] Fig.18 Schematic diagram of the structure of a concrete slab.

[0051] Fig.19 Schematic diagram of the explosion of a concrete slab.

[0052] Fig. 20 This is a front view structural diagram of a concrete arc slab.

[0053] Fig.21 This is a schematic diagram of the rear view structure of the concrete arc slab.

[0054] Fig. 22 Schematic diagram of the explosion of the concrete arc slab.

[0055] Explanation of the accompanying drawings: 1-variable cross-section tower, 2-assembled concrete tower, 3-tower column, 4-diagonal rod, 5-reinforcement column, 6-cross rod, 7-external prestressed cable, 8-plane cross partition, 9-node plate, 10-embedded parts, 11-concrete slab, 12-concrete arc plate, 13-vertical anchor bolt, 14-transverse anchor bolt, 15-cement base slurry, 16-epoxy splicing glue, 17-self-compacting concrete, 18-vertical anchor hole, 19-transverse anchor hole. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0057] Example

[0058] The schematic diagram of the assembled prestressed steel-concrete hybrid tower structure of the present invention is as follows Figure 1 and Figure 2 As shown, the structure is formed by a lower assembled concrete tower 2 and an upper variable-section tower frame 1 fixedly connected.

[0059] See also Figure 3 and Figure 4 The variable cross-section tower 1 is formed by a fixed connection of an upper variable cross-section truss, a middle constant cross-section truss and a lower variable cross-section truss. The cross-sectional area of ​​the upper variable cross-section truss gradually increases from top to bottom, and its maximum cross-sectional area is consistent with the cross-sectional area 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 its maximum cross-sectional area is consistent with the cross-sectional area of ​​the middle constant cross-section truss. Therefore, the variable cross-section tower 1 has a small disturbance, stronger anti-deformation ability and better stability due to its small two ends and large middle structure.

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

[0061] See also 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 towers 3, a group of cross bars 6 are fixedly connected from bottom to top between adjacent angle steel towers 3, and two diagonal bars 4 are symmetrically fixedly connected between the upper and lower adjacent cross bars 6.

[0062] 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 5, which are arranged on the symmetry lines of the adjacent angle steel tower columns 3, and the reinforcing columns 5 are fixedly connected to two or more crossbars 6 at the same time. The end faces of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss are all fixed with plane crossbars 8, and node plates 9 are fixedly connected to the plane crossbars 8. The adjacent trusses are fixedly connected with bolts through the node 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 by reinforcing columns 5 and plane crossbars 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 the node plate 9 and bolts, thereby achieving a fully assembled connection.

[0064] See also Figures 13 to 22 The assembled concrete tower 2 is formed by connecting two or more sections of single concrete cylinders, and 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.

[0065] A group of transverse anchor holes 19 are provided on both the left and right sides of the concrete flat plate 11 and the concrete arc-shaped plate 12, and the concrete flat plate 11 and the concrete arc-shaped plate 12 are fixedly connected by transverse anchor bolts 14 inserted into the transverse anchor holes 19; a group of vertical anchor holes 18 are provided on both the upper and lower ends of the concrete flat plate 11 and the concrete arc-shaped plate 12, and adjacent single concrete cylinders are fixedly connected by vertical anchor bolts 13 inserted into the vertical anchor holes 18.

[0066] The transverse anchor holes 19 and the vertical anchor holes 18 are both poured with self-compacting concrete 17 to enhance the connection strength between the anchor bolts and the anchor holes.

[0067] Cement base slurry 15 is filled between adjacent single concrete cylinders to enhance the connection strength between the single concrete cylinders, provide additional support and stability, and give full play to the density and stability of the structure; at the same time, epoxy splicing glue 16 is filled between adjacent concrete flat plates 11 and concrete arc-shaped plates 12, which can make the connection between the concrete flat plate tower piece 11 and the concrete arc-shaped tower piece 12 more firmly connected, thereby enhancing the overall rigidity 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, comprising the following steps:

[0069] Step 1: firstly, connect the concrete flat plate 11 and the concrete arc-shaped plate 12 through the transverse anchor bolts 14 to form a single concrete cylinder, and then connect more than two sections of the single concrete cylinder through the vertical anchor bolts 13 to form an assembled concrete tower 2;

[0070] Step 2: hoist the lower variable cross-section truss to the top of the assembled concrete tower 2, and fix the bottom of the lower variable cross-section truss to the embedded part 10 at the top of the assembled concrete tower 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 fix the three together to form a variable-section tower 1;

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

[0073] In summary, the present invention is a hybrid tower composed of a concrete tower and a steel structure tower, which not only reduces the deadweight of the structure and facilitates transportation, but also reduces the manufacturing cost. In addition, the assembled concrete tower 2 and the variable-section tower 1 in the present invention can be disassembled into several small-sized single pieces for easy transportation. In addition, the present invention adds an external prestressed cable 7 between the concrete tower 2 and the variable-section tower 1, so that an integral tower with prestress is formed between the assembled concrete tower 2 and the variable-section tower 1, ensuring that the stiffness and strength of the tower can meet the design requirements.

Claims

1. An assembled prestressed steel-concrete hybrid tower structure, characterized in that: The structure is formed by fixedly connecting a lower assembled concrete tower drum (2) and an upper variable-section tower frame (1).

2. The assembled prestressed steel-concrete hybrid tower structure according to claim 1 is characterized in that: The variable-section tower (1) is formed by fixedly connecting an upper variable-section truss, a middle constant-section truss and a lower variable-section truss.

3. The assembled prestressed steel-concrete hybrid tower structure according to claim 2 is characterized in that: An external prestressed cable (7) is fixedly connected between the top of the upper variable-section truss and the top of the assembled concrete tower (2), and an embedded part (10) is pre-embedded in the top of the assembled concrete tower (2), and the embedded part (10) is fixedly connected to the bottom of the lower variable-section truss.

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

5. The assembled prestressed steel-concrete hybrid tower structure according to claim 4 is characterized in that: 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 (5), 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.

6. The assembled prestressed steel-concrete hybrid tower structure according to claim 5 is characterized in that: Plane cross-frames (8) are fixed on the end faces of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss, and node plates (9) are fixedly connected to the plane cross-frames (8). Adjacent trusses are fixedly connected with bolts via the node plates (9).

7. The assembled prestressed steel-concrete hybrid tower structure according to claim 5 is characterized in that: The crossbar (6) is fixedly connected to the angle steel tower column (3), the diagonal bar (4) or the reinforcing column (5) via a node plate (9) and bolts.

8. The assembled prestressed steel-concrete hybrid tower structure according to claim 1 is characterized in that: The assembled concrete tower (2) is formed by connecting two or more sections of single concrete cylinders, and the single concrete cylinder is a square cylinder structure consisting of four concrete flat plates (11) and concrete arc-shaped plates (12) installed between adjacent concrete flat plates (11).

9. The assembled prestressed steel-concrete hybrid tower structure according to claim 8 is characterized in that: A group of transverse anchor holes (19) are provided on both left and right sides of the concrete flat plate (11) and the concrete circular arc plate (12), and the concrete flat plate (11) and the concrete circular arc plate (12) are fixedly connected by transverse anchor bolts (14) inserted into the transverse anchor holes (19); a group of vertical anchor holes (18) are provided on both upper and lower ends of the concrete flat plate (11) and the concrete circular arc plate (12), and adjacent single concrete cylinders are fixedly connected by vertical anchor bolts (13) inserted into the vertical anchor holes (18).

10. The assembled prestressed steel-concrete hybrid tower structure according to claim 9 is characterized in that: The transverse anchor holes (19) and the vertical anchor holes (18) are both poured with self-compacting concrete (17).

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

12. A construction method for the assembled prestressed steel-concrete hybrid tower structure according to any one of claims 1 to 11, characterized in that The following steps are involved: Step 1: firstly, a concrete flat plate (11) and a concrete arc-shaped plate (12) are connected by transverse anchor bolts (14) to form a single concrete cylinder, and then two or more sections of the single concrete cylinders are connected together by vertical anchor bolts (13) to form an assembled concrete tower cylinder (2); Step 2: hoist the lower variable cross-section truss to the top of the assembled concrete tower (2), and fix the bottom of the lower variable cross-section truss to the embedded part (10) at the top of the assembled concrete tower (2). Step 3: hoist the middle constant-section truss and the upper variable-section truss onto the lower variable-section truss in sequence, and fix the three together to form a variable-section tower (1); Step 4: An external prestressed cable (7) is fixedly connected between the top of the upper variable-section truss and the top of the assembled concrete tower (2), so that an integral tower with prestress is formed between the assembled concrete tower (2) and the variable-section tower (1).

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