A steel tube concrete composite cable tower and its construction method

Abstract

The present invention belongs to the technical field of bridge engineering, and in particular relates to a steel tube concrete composite cable tower and its construction method. The present invention achieves the purpose of having a steel tube concrete composite cable tower with high structural strength and long-term high-intensity use by arranging a bent main steel tube, a cable, a cable positioning hole, a reinforcement auxiliary steel tube unit, a concrete unit, and an anchoring steel plate unit on the pedestal. The present invention has the following advantages: First, the cable tower of the steel tube concrete composite structure has high structural strength, high stability, and strong bearing capacity, and can be used in bridge structures for a long time and at high intensity; second, the steel structure main body of the cable tower has high connection strength and uniform force, and the main steel tube and auxiliary steel tube are not easy to bend; third, both the main steel tube and the auxiliary steel tube can be poured with concrete, ensuring that the steel tube concrete composite structure can have the performance advantages of both; fourth, the entire construction process of the cable tower is simple, flexible, stable and safe.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a steel tube concrete composite cable tower and a construction method thereof. Background Art

[0002] Concrete-filled steel tube (CFST) composite cable towers are high-strength cable towers composed of steel tubes and concrete within them. The steel tubes constrain the concrete, reducing the rate of longitudinal cracking, while the core concrete inhibits or prevents localized buckling of the tubes. Overall, CFST offers numerous advantages, including strong plasticity and toughness, outstanding impact and seismic resistance, superior fire and corrosion resistance, and relatively simple construction requirements.

[0003] Nowadays, steel tube concrete has begun to appear in the main tower structure of cable-stayed bridges, which is the main pressure-bearing structure. However, most of the existing steel tube concrete cable towers have certain shortcomings such as simple structure, insufficient strength and unreasonable force distribution, which ultimately leads to the problem that the existing steel tube concrete cable towers cannot be used for a long time with high strength.

[0004] Therefore, it is necessary to design a steel tube concrete composite cable tower to truly achieve the effect of reasonable structural force and high overall strength, so as to ensure its efficient use in cable-stayed bridges.

[0005] The Chinese utility model patent with patent publication number CN209508809U and publication date of October 18, 2019, discloses an inner and outer double steel plate steel-concrete composite cable tower structure, including: a double steel plate steel shell structure; steel stiffening plates, including horizontal stiffening ribs and vertical stiffening ribs, evenly distributed on the outer steel shell and the inner steel shell, for improving the out-of-plane stiffness of the steel shell; a truss system, arranged inside the double steel plate steel shell structure, for connecting the outer steel shell and the inner steel shell; concrete, poured in the cavity surrounded by the inner and outer double steel plate steel shells; steel bars, including vertical steel bars and transverse steel bars, respectively passing through the horizontal stiffening ribs and vertical stiffening ribs to form a thin perforated plate-reinforced concrete tenon bidirectional connection structure; the cable tower structure is constructed in sections.

[0006] However, the cable tower structure in this utility model patent adopts a structural method in which concrete is located within two layers of steel plates, which greatly increases the difficulty of concrete pouring operation. Compared with the method of directly pouring concrete in steel pipes, it has the problems of great difficulty in operation and slow curing speed. Summary of the Invention

[0007] The present invention provides a steel tube concrete composite cable tower and a construction method thereof. By arranging a bent main steel tube, a stay cable, a stay cable positioning hole, a reinforcement auxiliary steel tube unit, a concrete unit, and an anchoring steel plate unit on a cap, the steel tube concrete composite cable tower can achieve the purpose of having a high structural strength and being able to be used for a long time with high strength.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problems is: a steel tube concrete composite cable tower, including a pedestal, curved main steel tubes with their lower ends respectively arranged on the pedestal, inclined cables arranged on the curved main steel tubes and used to connect the bridge body, and inclined cable positioning holes arranged on the curved main steel tubes, and also including a reinforcing auxiliary steel tube unit arranged on the curved main steel tube, a concrete unit arranged in the curved main steel tube, and an anchoring steel plate unit arranged on the pedestal and used to strengthen the installation of the curved main steel tube.

[0009] A further preferred technical solution is that the reinforcing auxiliary steel pipe unit includes a curved auxiliary steel pipe whose lower ends are respectively arranged on the steel pipe sections on both sides of the curved main steel pipe, and a vertical branch steel pipe arranged between the curved main steel pipe and the curved auxiliary steel pipe.

[0010] A further preferred technical solution is that the reinforcing auxiliary steel pipe unit further includes an auxiliary steel pipe casting hole provided on the curved auxiliary steel pipe, and auxiliary steel pipe concrete provided in the curved auxiliary steel pipe.

[0011] A further preferred technical solution is that the number of the auxiliary steel pipe casting holes is 3, which are respectively arranged in the middle and on both sides of the curved auxiliary steel pipe.

[0012] A further preferred technical solution is that the concrete unit includes a high-position casting hole arranged on the curved main steel pipe and located between the two rows of inclined cable positioning holes on both sides, a low-position casting hole arranged on the curved main steel pipe and located on the steel pipe sections on both sides of the curved main steel pipe, and main steel pipe concrete arranged in the curved main steel pipe.

[0013] A further preferred technical solution is that the anchoring steel plate unit includes an anchoring steel plate whose lower end is inserted into the pedestal and whose upper end is inserted into the main steel tube concrete, a steel pipe opening arranged on the curved main steel pipe and close to the lower end surface, a steel plate opening arranged on the anchoring steel plate, and a steel plate connecting column that passes through the steel pipe opening and the steel plate opening in sequence from the outside to the inside.

[0014] A further preferred technical solution is that the anchoring steel plate unit further includes a precast concrete hole provided on the curved main steel pipe and positioned higher than the steel pipe opening.

[0015] A further preferred technical solution is that the anchoring steel plate unit also includes a limit column arranged on the inner side of the curved main steel pipe and positioned higher than the precast concrete hole, and a wire mesh that is clamped between the upper and lower circles of the limit column and is used to limit the height of the precast concrete upward.

[0016] A further preferred technical solution is that the number of the curved main steel pipes is 2-10, and transverse connecting steel pipes are provided between adjacent curved main steel pipes.

[0017] A construction method for a steel tube concrete composite cable tower comprises the following steps: first, the curved main steel tube and the reinforcing auxiliary steel tube unit are welded and fixed, and then the curved main steel tube, the reinforcing auxiliary steel tube unit and the anchoring steel plate unit are subjected to concrete pouring operation, wherein the anchoring steel plate unit is cast and formed simultaneously with the curved main steel tube, or the anchoring steel plate unit is cast and solidified first and then the curved main steel tube is cast.

[0018] The present invention has the following advantages: first, the cable tower of the steel tube concrete composite structure has high structural strength, high stability, and strong bearing capacity, and can be used in bridge structures for a long time with high strength; second, the steel structure main body of the cable tower has high connection strength and uniform force, and the main steel pipe and the auxiliary steel pipe are not easy to bend; third, both the main steel pipe and the auxiliary steel pipe can be poured with concrete, ensuring that the steel tube concrete composite structure can have the performance advantages of both; fourth, the entire construction process of the cable tower is simple, flexible, stable and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of the steel tube concrete composite cable tower in the present invention.

[0020] Figure 2 It is a front view structural schematic diagram of the steel tube concrete composite cable tower in the present invention.

[0021] Figure 3 This is a schematic diagram of the position structure of the auxiliary steel pipe unit for reinforcement in the present invention.

[0022] Figure 4 This is a schematic diagram of the position structure of the concrete precast holes and the wire mesh in the present invention.

[0023] Figure 5 This is a schematic diagram of the use of steel plate connecting columns in the present invention. DETAILED DESCRIPTION

[0024] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0025] Example: As shown in the attached Figure 1 、 2 , 3, 4 and attached Figure 5As shown, a steel tube concrete composite cable tower includes a base 11, curved main steel tubes 12 with their lower ends respectively arranged on the base 11, inclined cables 13 arranged on the curved main steel tube 12 and used to connect to the bridge body a, and inclined cable positioning holes 14 arranged on the curved main steel tube 12. It also includes a reinforcing auxiliary steel tube unit 1 arranged on the curved main steel tube 12, a concrete unit 2 arranged in the curved main steel tube 12, and an anchoring steel plate unit 3 arranged on the base 11 and used to reinforce the installation of the curved main steel tube 12.

[0026] In this embodiment, the reinforcing auxiliary steel pipe unit 1 is used to reinforce the lower part of the curved main steel pipe 12, wherein the structure of the curved main steel pipe 12 is a half-elliptical segment on the upper part and two vertical segments on the lower part, and the reinforcing auxiliary steel pipe unit 1 is arc-shaped and can be used for connection and reinforcement, and the concrete unit 2 is used to pour into the curved main steel pipe 12 to ensure that the curved main steel pipe 12 has the advantages of high strength and high bearing capacity of steel pipe concrete composite.

[0027] Finally, the function of the anchoring steel plate unit 3 is to strengthen the connection between the base 11 and the curved main steel pipe 12, so as to ensure that the lower end of the curved main steel pipe 12 has great installation strength.

[0028] The reinforcing secondary steel pipe unit 1 includes a curved secondary steel pipe 101, with its lower ends respectively positioned on the steel pipe sections on either side of the curved main steel pipe 12, and a vertical branch steel pipe 102 positioned between the curved main steel pipe 12 and the curved secondary steel pipe 101. The reinforcing secondary steel pipe unit 1 also includes secondary steel pipe casting holes 103 provided on the curved secondary steel pipe 101 and secondary steel pipe concrete 104 provided within the curved secondary steel pipe 101. There are three secondary steel pipe casting holes 103, located in the middle and on both sides of the curved secondary steel pipe 101.

[0029] In this embodiment, the auxiliary steel pipe concrete 104 can be fully filled in the curved auxiliary steel pipe 101, or it can be partially poured. The choice of the two methods is a trade-off between the advantages of structural enhancement and the disadvantages of weight increase. Both methods are acceptable. When the curved auxiliary steel pipe 101 is fully filled with concrete, the pipe mouth of the concrete tank truck can pour concrete from the highest auxiliary steel pipe pouring hole 103 in the middle. Conversely, when partially filled, concrete can be poured from the auxiliary steel pipe pouring holes 103 on both sides. The amount of concrete accidentally leaked from the auxiliary steel pipe pouring holes 103 on both sides is small and can be ignored.

[0030] The concrete unit 2 includes a high-position casting hole 201 arranged on the curved main steel pipe 12 and located between the two rows of inclined cable positioning holes 14 on both sides, a low-position casting hole 202 arranged on the curved main steel pipe 12 and located on the steel pipe sections on both sides of the curved main steel pipe 12, and a main steel pipe concrete 203 arranged in the curved main steel pipe 12.

[0031] In this embodiment, the main steel tube concrete 203 , like the secondary steel tube concrete 104 , can also be fully filled or partially filled, and is also selectively poured between the high-position pouring hole 201 and the low-position pouring hole 202 .

[0032] It should be noted that when pouring the main steel tube concrete 203, the inclined cable positioning hole 14 cannot be blocked. The method used can be to pre-install a steel tube aligned with the opening at the inclined cable positioning hole 14 so that the concrete will not overflow and block the hole.

[0033] The anchoring steel plate unit 3 includes an anchoring steel plate 301 with its lower end inserted into the cap 11 and its upper end inserted into the main steel tube concrete 203; a steel tube opening 302 provided on the curved main steel tube 12 near the lower end surface; a steel plate opening 303 provided on the anchoring steel plate 301; and a steel plate connecting column 304 that passes through the steel tube opening 302 and the steel plate opening 303 from the outside to the inside. The anchoring steel plate unit 3 also includes a precast concrete hole 305 provided on the curved main steel tube 12 and positioned higher than the steel tube opening 302.

[0034] In this embodiment, the reinforcement effect between the anchoring steel plate 301 and the curved main steel pipe 12 is achieved through two connection relationships: first, the anchoring steel plate 301 is located in the main steel pipe concrete 203, and like the curved main steel pipe 12, is cast and fixed by the main steel pipe concrete 203; second, the anchoring steel plate 301 and the curved main steel pipe 12 are provided with the plug-in steel plate connecting column 304, so that the integrity of the two is greatly improved, and the overall connection strength is also significantly improved.

[0035] In addition, after the lower end opening of the curved main steel pipe 12 has "covered" the anchoring steel plate 301, there are two ways to fix the anchoring steel plate 301 by pouring the main steel pipe concrete 203: first, concrete is poured directly from the high-position pouring hole 201 or the low-position pouring hole 202, and pouring is started directly from the upper surface of the base 11, so that the anchoring steel plate 301 can be poured and connected in one step. The advantage of this method is that it is simple and convenient, and the disadvantage is that a large amount of concrete is poured before the curved main steel pipe 12 is initially fixed, and the curved main steel pipe 12 may eventually have a problem of lower deflection.

[0036] Secondly, a small amount of concrete is poured from the concrete pre-casting hole 305 first, and after part of the concrete is completely fixed, the main concrete required above is poured into the high-position casting hole 201 or the low-position casting hole 202. In this way, the anchoring steel plate 301 can also be firmly fixed, and the advantage is that the lower end corner of the curved main steel pipe 12 is fixed first and then a large amount of main concrete is poured. This ensures that the upper end of the curved main steel pipe 12 is not easily deflected.

[0037] The anchoring steel plate unit 3 also includes a limiting column 306 arranged on the inner side of the curved main steel pipe 12 and positioned higher than the precast concrete hole 305, and a wire mesh 307 that is engaged between the upper and lower circles of the limiting columns 306 and is used to limit the height of the precast concrete upward.

[0038] In this embodiment, the setting of the wire mesh 307 is to quantify the operation of pre-pouring a small amount of concrete in the lower part, thereby avoiding the problem of more pre-pouring concrete on one side and less on the other side at both ends of the two curved main steel pipes 12, and ensuring that the strength of the lower fixing of both ends of the curved main steel pipe 12 is consistent, so that the force and torque during subsequent pouring of a large amount of concrete can be the same, and the entire curved main steel pipe 12 will not have problems with deflection or self-twisting.

[0039] The number of the curved main steel pipes 12 is 2-10, and a transverse connecting steel pipe 5 is provided between adjacent curved main steel pipes 12 .

[0040] In this embodiment, the plurality of curved main steel pipes 12 can be arranged in parallel or vertically extended. Adding the transverse connecting steel pipe 5 between them can ensure that the overall strength of the entire cable tower can be further enhanced.

[0041] A construction method for a steel tube concrete composite cable tower comprises first welding and fixing the curved main steel tube 12 and the reinforcing auxiliary steel tube unit 1, and then performing a concrete pouring operation on the curved main steel tube 12, the reinforcing auxiliary steel tube unit 1, and the anchoring steel plate unit 3, wherein the anchoring steel plate unit 3 is cast and formed simultaneously with the curved main steel tube 12, or the anchoring steel plate unit 3 is cast and solidified first and then the curved main steel tube 12 is cast.

[0042] In this embodiment, the construction method of the steel tube concrete composite cable tower is generally to build the steel structure first and then pour the concrete. Otherwise, it is very difficult to hoist and erect the steel tube and concrete together.

[0043] Finally, the pouring sequence of the anchoring steel plate unit 3 can be as described above. It can be cast together with the main steel tube concrete 203, or a small amount can be pre-cast and fixed before pouring the main steel tube concrete 203. Both are optional.

[0044] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the aforementioned embodiments. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A steel tube concrete composite cable tower, comprising a cap (11), a curved main steel tube (12) with lower ends on both sides respectively arranged on the cap (11), a stay cable (13) arranged on the curved main steel tube (12) and used for connecting to a bridge body (a), and a stay cable positioning hole (14) arranged on the curved main steel tube (12), characterized in that: It also includes a reinforcing auxiliary steel pipe unit (1) arranged on the curved main steel pipe (12), a concrete unit (2) arranged in the curved main steel pipe (12), and an anchoring steel plate unit (3) arranged on the base (11) and used for reinforcing the installation of the curved main steel pipe (12). The concrete unit (2) comprises a high-position pouring hole (201) provided on the curved main steel pipe (12) and located between two rows of the inclined cable positioning holes (14) on both sides, a low-position pouring hole (202) provided on the curved main steel pipe (12) and located on the steel pipe sections on both sides of the curved main steel pipe (12), and main steel pipe concrete (203) provided in the curved main steel pipe (12). The anchoring steel plate unit (3) comprises an anchoring steel plate (301) whose lower end is inserted into the pedestal (11) and whose upper end is inserted into the main steel tube concrete (203), a steel tube opening (302) provided on the curved main steel tube (12) and close to the lower end surface, a steel plate opening (303) provided on the anchoring steel plate (301), and a steel plate connecting column (304) passing through the steel tube opening (302) and the steel plate opening (303) in sequence from the outside to the inside. The anchoring steel plate unit (3) further includes a precast concrete hole (305) provided on the curved main steel pipe (12) and positioned higher than the steel pipe opening (302). The anchoring steel plate unit (3) further includes a limiting column (306) provided on the inner side surface of the curved main steel pipe (12) and positioned higher than the precast concrete hole (305), and a steel wire mesh (307) provided between upper and lower circles of the limiting column (306) and used to limit the height of the precast concrete upward. The steel mesh (307) is arranged at the same height at both ends of the curved main steel pipe (12). The construction method of the steel tube concrete composite cable tower comprises the following steps: firstly welding and fixing the curved main steel tube (12) and the reinforcing auxiliary steel tube unit (1), and then performing a concrete pouring operation on the curved main steel tube (12), the reinforcing auxiliary steel tube unit (1) and the anchoring steel plate unit (3), wherein the anchoring steel plate unit (3) is poured and solidified first and then the curved main steel tube (12) is poured.

2. The steel tube concrete composite cable tower according to claim 1, characterized in that: The reinforcing auxiliary steel pipe unit (1) comprises a curved auxiliary steel pipe (101) whose lower ends are respectively arranged on the steel pipe sections on both sides of the curved main steel pipe (12), and a vertical branch steel pipe (102) arranged between the curved main steel pipe (12) and the curved auxiliary steel pipe (101).

3. The steel tube concrete composite cable tower according to claim 2, characterized in that: The reinforcing auxiliary steel pipe unit (1) further includes an auxiliary steel pipe casting hole (103) provided on the curved auxiliary steel pipe (101), and auxiliary steel pipe concrete (104) provided in the curved auxiliary steel pipe (101).

4. The steel tube concrete composite cable tower according to claim 3, characterized in that: The number of the auxiliary steel pipe casting holes (103) is 3, which are respectively arranged in the middle and on both sides of the curved auxiliary steel pipe (101).

5. The steel tube concrete composite cable tower according to claim 1, characterized in that: The number of the curved main steel pipes (12) is 2-10, and a transverse connecting steel pipe (5) is provided between adjacent curved main steel pipes (12).

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