U-shaped thin-walled steel-prestressed concrete composite capping beam and thin-walled concrete-filled steel tube pier column joint structure and construction technology

Abstract

The present invention discloses a joint structure and construction technology for a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column, including a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column. When the thin-walled concrete-filled steel tube pier column is connected to the U-shaped thin-walled steel-prestressed concrete composite capping beam, connectors, ear plates, extensible threaded steel tubes, platform beams and extensible steel cables are arranged on the thin-walled concrete-filled steel tube pier column to ensure the stability during the installation process. Concrete is poured into the processed U-shaped thin-walled steel beam to form the U-shaped thin-walled steel-prestressed concrete composite capping beam. After the concrete solidifies to reach the designed strength, the composite beam formed by tensioning the prestressed steel bars embedded therein is obtained. The U-shaped thin-walled steel-prestressed concrete composite beam of the present invention has reliable connection with the concrete-filled steel tube column, convenient installation, simple construction, good seismic and fire resistance performance and low cost.

Description

Technical Field

[0001] The present invention relates to the field of construction, and particularly to a joint structure and construction technology of a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column. Background Art

[0002] A capping beam is a cross beam set at the top of a bridge bent pile pier, also known as a coping beam. Its main function is to support the upper structure of the bridge and transfer all loads to the lower structure. In the current construction of bridge engineering, due to the limitations of bridge height, geology and terrain conditions, the lower part of some bridges adopts the structural form of single-column piers and prestressed capping beams. Generally, support points are set on the pier columns, and I-beams or Bailey frames are used as capping beam support brackets. In existing T-shaped single-column pier beams, pier beams and structural beams mainly bearing shear force, there are common disadvantages such as large cross-sections of components, a large amount of reinforcement, poor ductility and insufficient seismic performance.

[0003] Therefore, there is an urgent need to develop a joint structure and construction technology with reliable structural connection and rapid and convenient construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a joint structure and construction technology with reliable structural connection and rapid and convenient construction.

[0005] The technical solution adopted to achieve the purpose of the present invention is as follows. A joint structure of a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column includes a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column.

[0006] The upper end of the thin-walled concrete-filled steel tube pier column is connected to the lower surface of the mid-span of the U-shaped thin-walled steel-prestressed concrete composite capping beam.

[0007] The U-shaped thin-walled steel-prestressed concrete composite capping beam includes a U-shaped thin-walled steel plate and a number of prestressed tendons.

[0008] The cross-section of the U-shaped thin-walled steel plate is U-shaped, with an opening at the upper end and a closed bottom surface at the lower end.

[0009] Below the opening is the internal cavity of the U-shaped thin-walled steel plate.

[0010] The transverse length direction of the internal cavity is the longitudinal direction of the U-shaped thin-walled steel plate, and the longitudinal length direction of the internal cavity is the transverse direction of the U-shaped thin-walled steel plate.

[0011] The parts of the U-shaped thin-walled steel plate on both sides of the internal cavity are denoted as side plates Ⅰ. The part of the U-shaped thin-walled steel plate below the internal cavity is denoted as bottom plate Ⅰ.

[0012] Sealing plates are welded to both longitudinal ends of the U-shaped thin-walled steel plate.

[0013] A number of the prestressing tendons are located in the internal cavity. After each prestressing tendon is tensioned to form prestress, both ends thereof are anchored on the sealing plate.

[0014] The internal space of the U-shaped thin-walled steel plate is filled with cast concrete.

[0015] Furthermore, a number of stud bolts are welded on the inner surface of the bottom plate.

[0016] Furthermore, a number of cover plates are welded at the open end of the U-shaped thin-walled steel plate.

[0017] Furthermore, the U-shaped thin-walled steel plate is formed by cold bending, splicing or welding of a thin-walled steel plate.

[0018] Furthermore, the prestressing tendon is a bonded prestressed steel wire, a bonded strand, a bonded prestressed threaded steel bar, an unbonded prestressed steel wire, an unbonded strand or an unbonded prestressed threaded steel bar.

[0019] Based on the above construction technology of the U-shaped thin-walled steel-prestressed concrete composite capping beam and the thin-walled steel tube concrete pier column joint structure, the following steps are included:

[0020] 1) Cold bend, splice or weld the thin-walled steel plate to fabricate the U-shaped thin-walled steel plate. Wherein, the U-shaped thin-walled steel plate includes a bottom plate Ⅰ and two side plates Ⅰ. A number of through holes are processed at the mid-span position of the bottom plate Ⅰ.

[0021] 2) A number of the prestressing tendons pass through the internal cavity of the U-shaped thin-walled steel plate so that both ends of each prestressing tendon extend out of the U-shaped thin-walled steel plate.

[0022] 3) One end of a number of the prestressing tendons extending out of the U-shaped thin-walled steel plate passes through a number of through holes of a sealing plate, and the other end of a number of the prestressing tendons extending out of the U-shaped thin-walled steel plate passes through a number of through holes of another sealing plate, and these two sealing plates are connected to the two end faces of the U-shaped thin-walled steel plate.

[0023] 4) Install the thin-walled steel tube concrete pier column at the designed position, and embed a number of connectors at the top end of the thin-walled steel tube concrete pier column.

[0024] 5) Connect two ear plates on the side wall in the middle section of the thin-walled steel tube concrete pier column, ensuring that the connection line of these two ear plates intersects with the axis of the thin-walled steel tube concrete pier column. Each of these two ear plates is connected to a telescopic threaded steel tube, and the upper end of each telescopic threaded steel tube is connected to a platform beam. Wherein, the upper surfaces of the two platform beams and the upper end surface of the thin-walled steel tube concrete pier column are on the same horizontal plane, and a number of telescopic steel cables are connected between the two platform beams.

[0025] 6) Install the assembly of the U-shaped thin-walled steel plate, several of the prestressed tendons, and two sealing plates processed in steps 1) to 3) to the upper end of the thin-walled concrete-filled steel tube pier column, so that several of the connecting pieces are inserted into several through holes of the bottom plate I and then extend into the interior of the U-shaped thin-walled steel plate. The longitudinal two ends of the bottom plate I are respectively installed on the upper surfaces of two platform beams.

[0026] 7) Tension one end or both ends of the prestressed tendon. And clamp tensioning anchor fittings at both ends of each prestressed tendon, so that each tensioning anchor fitting is anchored on the sealing plate.

[0027] 8) Pour and fill the interior of the U-shaped thin-walled steel beam with concrete.

[0028] 9) After the concrete reaches the designed strength, remove the ear plates, extensible threaded steel tubes, platform beams, and extensible steel cables.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. The U-shaped thin-walled steel-prestressed concrete composite capping beam takes strengthening measures in the joint area. Local stiffening ribs are welded and stud bolts are locally densified in the thin-walled steel beam to make the force transmission reliable, which has no impact on the appearance, and construction lapping holes are reserved;

[0031] 2. Reinforcing bars are embedded in the joint area of the thin-walled concrete-filled steel tube pier column and lapped with the U-shaped thin-walled steel-prestressed concrete composite capping beam, then extend into the composite beam, and then concrete is poured, so that the integrity of the U-shaped thin-walled steel-prestressed concrete composite capping beam and the joint of the thin-walled concrete-filled steel tube pier column is stronger, and the beam and the column are integrated in the joint area;

[0032] 3. A combined tool with an auxiliary construction platform is designed to provide temporary construction support to ensure the stability and construction accuracy of the fixed joint area during the construction process. Description of the Drawings

[0033] Figure 1 It is a part drawing of the U-shaped thin-walled steel-prestressed concrete composite beam;

[0034] Figure 2 It is a construction process drawing of the U-shaped thin-walled steel-prestressed concrete composite beam;

[0035] Figure 3 It is a bottom view of the U-shaped thin-walled steel-prestressed concrete composite beam;

[0036] Figure 4 It is a side view of the U-shaped thin-walled steel-prestressed concrete composite beam;

[0037] Figure 5 It is a top view of the U-shaped thin-walled steel-prestressed concrete composite beam;

[0038] Figure 6 It is a longitudinal sectional view of a U-shaped thin-walled steel-prestressed concrete composite beam;

[0039] Figure 7 It is a sectional view taken along line A-A;

[0040] Figure 8 It is a sectional view taken along line B-B;

[0041] Figure 9 It is a construction process drawing of the joint structure between a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column;

[0042] Figure 10 It is a schematic diagram of the joint structure between a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column.

[0043] In the figure: U-shaped thin-walled steel plate 1, bottom plate I 101, stud 1011, side plate I 102, flange 1021, prestressing tendon 3, tensioning anchor 301, sealing plate 4, cover plate 5, concrete 6, thin-walled steel tube concrete pier column 7, connecting piece 701, ear plate 702, extensible threaded steel tube 703, platform beam 704 and extensible steel cable 705. Specific embodiments

[0044] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter scope of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, various substitutions and changes made according to common general knowledge and customary means in the art should be included within the protection scope of the present invention.

[0045] Embodiment 1:

[0046] This embodiment discloses a joint structure between a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column, including a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column 7.

[0047] See Figure 9 Or 10, the upper end of the thin-walled steel tube concrete pier column 7 is connected to the lower surface at the mid-span of the U-shaped thin-walled steel-prestressed concrete composite capping beam.

[0048] The U-shaped thin-walled steel-prestressed concrete composite capping beam includes a U-shaped thin-walled steel plate 1 and a number of prestressing tendons 3.

[0049] The U-shaped thin-walled steel plate 1 is formed by welding thin-walled steel plates, and the welding process ensures equal-strength welding. The model of the thin-walled steel plate is Q235. See Figure 1 Or 2, the U-shaped thin-walled steel plate 1 is a steel beam with a constant cross-section.

[0050] SeeFigure 1 The cross-section of the U-shaped thin-walled steel plate 1 is U-shaped, with an opening at the upper end and a closed bottom surface at the lower end.

[0051] Below the opening is the internal cavity of the U-shaped thin-walled steel plate 1.

[0052] The transverse length direction of the internal cavity is the longitudinal direction of the U-shaped thin-walled steel plate 1, and the longitudinal length direction of the internal cavity is the transverse direction of the U-shaped thin-walled steel plate 1.

[0053] The parts of the U-shaped thin-walled steel plate 1 on both sides of the internal cavity are denoted as side plates Ⅰ 102, and the part of the U-shaped thin-walled steel plate 1 below the internal cavity is denoted as bottom plate Ⅰ 101.

[0054] A number of stud bolts 1011 are welded to the inner side of the bottom plate Ⅰ 101.

[0055] See Figure 3 、 4 、5 or 6, sealing plates 4 are welded to both longitudinal ends of the U-shaped thin-walled steel plate 1, and a number of through holes are provided on each of the sealing plates 4.

[0056] See Figure 2 、 6 、7 or 8, a number of prestressing tendons 3 pass through a number of through holes on the sealing plates 4. A number of the prestressing tendons 3 are close to the opening end of the U-shaped thin-walled steel plate 1.

[0057] In this embodiment, the prestressing tendons 3 are non-bonded steel strands. The arrangement of a number of the prestressing tendons 3 is a straight-line arrangement.

[0058] See Figure 3 , tensioning anchor fittings 301 are clamped at both ends of each prestressing tendon 3, and a number of the tensioning anchor fittings 301 are anchored on the sealing plates 4.

[0059] A number of cover plates 5 are welded to the opening end of the U-shaped thin-walled steel plate 1. The cross-section of the cover plates 5 is U-shaped, and the opening ends of a number of the cover plates 5 are opposite to the opening end of the U-shaped thin-walled steel plate 1.

[0060] The cover plates 5 include a bottom plate Ⅱ and two side plates Ⅱ, and the two side plates Ⅱ are respectively welded to the outer sides of the two side plates Ⅰ 102.

[0061] See Figure 2 , the internal part of the U-shaped thin-walled steel plate 1 is filled with cast-in-place concrete 6, and the concrete 6 is ordinary concrete that can meet the strength conditions of prestressed concrete. Thus, the U-shaped thin-walled steel plate 1, a number of prestressing tendons 3 and the concrete 6 form a U-shaped thin-walled steel-prestressed concrete composite beam.

[0062] In use, the open end of the U-shaped thin-walled steel-prestressed concrete composite beam with prestressing tendons serves as the tension zone of the beam.

[0063] Embodiment 2:

[0064] This embodiment discloses a node structure of a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column, including a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled steel tube concrete pier column 7.

[0065] See Figure 9 or 10, the upper end of the thin-walled steel tube concrete pier column 7 is connected to the lower surface of the mid-span of the U-shaped thin-walled steel-prestressed concrete composite capping beam.

[0066] The U-shaped thin-walled steel-prestressed concrete composite capping beam includes a U-shaped thin-walled steel plate 1 and several prestressing tendons 3.

[0067] See Figure 1 , the cross-section of the U-shaped thin-walled steel plate 1 is U-shaped, with an opening at the upper end and a closed bottom surface at the lower end.

[0068] Below the opening is the internal cavity of the U-shaped thin-walled steel plate 1.

[0069] The transverse length direction of the internal cavity is the longitudinal direction of the U-shaped thin-walled steel plate 1, and the longitudinal length direction of the internal cavity is the transverse direction of the U-shaped thin-walled steel plate 1.

[0070] See Figure 1 or 2, the parts of the U-shaped thin-walled steel plate 1 on both sides of the internal cavity are denoted as side plates I 102. The part of the U-shaped thin-walled steel plate 1 below the internal cavity is denoted as bottom plate I 101.

[0071] See Figure 3 , 4 , 5 or 6, sealing plates 4 are welded to both longitudinal ends of the U-shaped thin-walled steel plate 1.

[0072] Several of the prestressing tendons 3 are located in the internal cavity. After each prestressing tendon 3 is tensioned to form prestress, both ends of it are anchored on the sealing plate 4.

[0073] The internal space of the U-shaped thin-walled steel plate 1 is filled with poured concrete 6. The concrete 6 is ordinary concrete, and this ordinary concrete meets the requirements of the tensile concrete strength.

[0074] Embodiment 3:

[0075] The main structure of this embodiment is the same as that of Embodiment 2. Further, see Figure 1 , 6 , 7 or 8, several stud bolts 1011 are welded to the upper surface of the bottom plate 101.

[0076] Example 4:

[0077] The main structure of this example is the same as that of Example 3. Further, refer to Figure 1 、 6 、7 or 8. A number of cover plates 5 are welded to the open end of the U-shaped thin-walled steel plate 1. Refer to Figure 1 or 7. The cross-section of the cover plate 5 is U-shaped, and the open ends of the number of cover plates 5 face the open end of the U-shaped thin-walled steel plate 1.

[0078] The cover plate 5 includes a bottom plate II and two side plates II, and the two side plates II are respectively welded to the outer sides of the two side plates I 102.

[0079] Example 5:

[0080] The main structure of this example is the same as that of Example 4. Further, refer to Figure 1 、 6 、7 or 8. The U-shaped thin-walled steel plate 1 is formed by welding a thin-walled steel plate, and the welding process ensures equal-strength welding. The cross-sections at all positions of the U-shaped thin-walled steel plate 1 are the same.

[0081] Example 6:

[0082] The main structure of this example is the same as that of Example 5. Further, the prestressing tendon 3 is a non-bonded steel strand.

[0083] Example 7:

[0084] This example discloses a construction process for the joint structure of the U-shaped thin-walled steel-prestressed concrete combined capping beam and the thin-walled steel tube concrete pier column described in Example 1. Refer to Figure 2 or 9, including the following steps:

[0085] 1) Weld the thin-walled steel plate to fabricate the U-shaped thin-walled steel plate 1. Among them, the U-shaped thin-walled steel plate 1 includes a bottom plate I 101 and two side plates I 102. At the open end of each side plate I 102, a curled edge 1021 is processed. On the outer surface of each side plate I 102, an ear plate 702 is welded, and the ear plate 702 is located at the mid-span position of the corresponding side plate I 102. A number of through holes are processed at the mid-span position of the bottom plate I 101, and a number of stud bolts 1011 are welded to the inner surface of the bottom plate I 101.

[0086] 2) A number of the prestressing tendons 3 pass through the internal cavity of the U-shaped thin-walled steel plate 1, so that both ends of each prestressing tendon 3 extend out of the U-shaped thin-walled steel plate 1. Among them, a number of the prestressing tendons 3 are close to the open end of the U-shaped thin-walled steel plate 1.

[0087] 3) One end of several of the prestressed tendons 3 extends out of the U-shaped thin-walled steel plate 1 and passes through several through holes of a sealing plate 4. The other end of several of the prestressed tendons 3 that extends out of the U-shaped thin-walled steel plate 1 passes through several through holes of another sealing plate 4, and these two sealing plates 4 are connected to the two end faces of the U-shaped thin-walled steel plate 1.

[0088] 4) Weld several cover plates 5 at the open end of the U-shaped thin-walled steel plate 1. Weld the two side plates II of each of the cover plates 5 to the outer surfaces of the two side plates I 102 respectively.

[0089] 5) Install the thin-walled steel tube concrete pier column 7 at the designed position, and embed several connecting pieces 701 at the top end of the thin-walled steel tube concrete pier column 7. Connect two ear plates 702 to the side wall at the upper end of the thin-walled steel tube concrete pier column 7. The connection line of these two ear plates 702 intersects with the axis of the thin-walled steel tube concrete pier column 7.

[0090] 6) Connect two ear plates 702 to the side wall in the middle section of the thin-walled steel tube concrete pier column 7, and ensure that the connection line of these two ear plates 702 intersects with the axis of the thin-walled steel tube concrete pier column 7. Each of these two ear plates 702 is connected to a telescopic threaded steel tube 703, and the upper end of each telescopic threaded steel tube 703 is connected to a platform beam 704. Among them, the upper surfaces of the two platform beams 704 and the upper end face of the thin-walled steel tube concrete pier column 7 are on the same horizontal plane, and several telescopic steel cables 705 are connected between the two platform beams 704.

[0091] 7) Install the combination of the U-shaped thin-walled steel plate 1, several of the prestressed tendons 3 and the two sealing plates 4 processed in steps 1) to 4) to the upper end of the thin-walled steel tube concrete pier column 7, so that several of the connecting pieces 701 extend into the interior of the U-shaped thin-walled steel plate 1 after inserting into several through holes of the bottom plate I 101. The longitudinal two ends of the bottom plate I 101 are respectively installed on the upper surfaces of the two platform beams 704. And weld stiffening ribs at the connection between the thin-walled steel tube concrete pier column 7 and the U-shaped thin-walled steel plate 1. Connect the two ear plates 702 on the upper end side wall of the thin-walled steel tube concrete pier column 7 to the ear plates 702 on the side walls of the two flange I 102 respectively.

[0092] 8) Tension one end or both ends of the prestressed tendon 3; and clamp tensioning anchor fittings 301 at both ends of each of the prestressed tendons 3, so that each of the tensioning anchor fittings 301 is anchored on the sealing plate 4.

[0093] 9) Pour and fill the concrete 6 into the interior of the U-shaped thin-walled steel beam 1.

[0094] 10) After the concrete 6 reaches the designed strength, remove the ear plates 702, telescopic threaded steel tubes 703, platform beams 704 and telescopic steel cables 705.

Claims

1. A joint structure of a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column, characterized in that: It includes a U-shaped thin-walled steel-prestressed concrete composite capping beam and a thin-walled concrete-filled steel tube pier column (7); The upper end of the thin-walled concrete-filled steel tube pier column (7) is connected to the lower surface at the mid-span of the U-shaped thin-walled steel-prestressed concrete composite capping beam; The U-shaped thin-walled steel-prestressed concrete composite capping beam includes a U-shaped thin-walled steel plate (1) and a number of prestressing tendons (3); The cross-section of the U-shaped thin-walled steel plate (1) is U-shaped, with an opening at the upper end and a closed bottom surface at the lower end; A number of cover plates (5) are welded to the open end of the U-shaped thin-walled steel plate (1); Below the opening is the internal cavity of the U-shaped thin-walled steel plate (1); The transverse length direction of the internal cavity is the longitudinal direction of the U-shaped thin-walled steel plate (1), and the longitudinal length direction of the internal cavity is the transverse direction of the U-shaped thin-walled steel plate (1); The parts of the U-shaped thin-walled steel plate (1) on both sides of the internal cavity are denoted as side plates Ⅰ (102); The part of the U-shaped thin-walled steel plate (1) below the internal cavity is denoted as bottom plate Ⅰ (101); A number of stud bolts (1011) are welded to the inner surface of the bottom plate Ⅰ (101); Sealing plates (4) are welded to both longitudinal ends of the U-shaped thin-walled steel plate (1); A number of the prestressing tendons (3) are located in the internal cavity; After each prestressing tendon (3) is tensioned to form prestress, both ends of it are anchored on the sealing plate (4); The internal space of the U-shaped thin-walled steel plate (1) is filled with concrete (6) by pouring; During use, the open end of the U-shaped thin-walled steel-prestressed concrete composite beam where the prestressing tendons are arranged serves as the tension zone of the beam.

2. The U-shaped thin-walled steel-prestressed concrete composite capping beam and thin-walled concrete-filled steel tube pier column joint structure according to claim 1, wherein: The U-shaped thin-walled steel plate (1) is processed from thin-walled steel plates by cold bending, splicing or welding.

3. The U-shaped thin-walled steel-prestressed concrete composite capping beam and thin-walled concrete-filled steel tube pier column joint structure according to claim 1, characterized in that: The prestressing tendons (3) are bonded prestressed steel wires, bonded steel strands, bonded prestressed threaded steel bars, unbonded prestressed steel wires, unbonded steel strands or unbonded prestressed threaded steel bars.

4. The construction technology of the joint structure of the U-shaped thin-walled steel-prestressed concrete combined capping beam and the thin-walled concrete-filled steel tube pier column according to claim 1, characterized in that, It includes the following steps: 1) Cold bend, splice or weld the thin-walled steel plate to make the U-shaped thin-walled steel plate (1); Among them, the U-shaped thin-walled steel plate (1) includes a bottom plate Ⅰ (101) and two side plates Ⅰ (102); A number of through holes are processed at the mid-span position of the bottom plate Ⅰ (101); 2) A number of the prestressing tendons (3) pass through the internal cavity of the U-shaped thin-walled steel plate (1) so that both ends of each prestressing tendon (3) extend out of the U-shaped thin-walled steel plate (1); 3) One end of a number of the prestressing tendons (3) extending out of the U-shaped thin-walled steel plate (1) passes through a number of through holes in a sealing plate (4), and the other end of a number of the prestressing tendons (3) extending out of the U-shaped thin-walled steel plate (1) passes through a number of through holes in another sealing plate (4), and these two sealing plates (4) are connected to the two end faces of the U-shaped thin-walled steel plate (1); 4) Install the thin-walled concrete-filled steel tube pier column (7) at the designed position, and embed a number of connectors (701) at the top of the thin-walled concrete-filled steel tube pier column (7); 5) Connect two ear plates (702) to the side wall of the middle section of the thin-walled concrete-filled steel tube pier column (7), ensuring that the connection line of these two ear plates (702) intersects with the axis of the thin-walled concrete-filled steel tube pier column (7); each of these two ear plates (702) is connected to a telescopic threaded steel tube (703), and the upper end of each telescopic threaded steel tube (703) is connected to a platform beam (704); wherein, the upper surfaces of the two platform beams (704) and the upper end surface of the thin-walled concrete-filled steel tube pier column (7) are on the same horizontal plane, and a number of telescopic steel cables (705) are connected between the two platform beams (704); 6) Install the combination of the U-shaped thin-walled steel plate (1), a number of the prestressed tendons (3) and two sealing plates (4) processed in steps 1) to 3) to the upper end of the thin-walled concrete-filled steel tube pier column (7), so that a number of the connecting pieces (701) extend into the interior of the U-shaped thin-walled steel plate (1) after inserting into a number of through holes of the bottom plate Ⅰ (101), and the longitudinal two ends of the bottom plate Ⅰ (101) are respectively installed on the upper surfaces of the two platform beams (704); 7) Tension one end or both ends of the prestressed tendon (3); and clamp tensioning anchor fittings (301) at both ends of each prestressed tendon (3), so that each tensioning anchor fitting (301) is anchored on the sealing plate (4); 8) Pour and fill the interior of the U-shaped thin-walled steel plate (1) with concrete (6); 9) After the concrete (6) reaches the design strength, remove the ear plates (702), telescopic threaded steel tubes (703), platform beams (704) and telescopic steel cables (705).

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