Simple support device for post-tensioning prestressed tendon of large-span prestressed beam

Abstract

The utility model discloses a simple support device for a post-tensioning prestressed tendon of a large-span prestressed beam. The simple support device comprises a positioning frame, a harness cord screw, a reinforcing steel bar support, a corrugated pipe fixing frame, a steel strand and a corrugated pipe. The multiple sets of positioning frames are fixedly arranged on prestressed beam main reinforcements at intervals in the bridge direction according to requirements, and the bottoms of the positioning frames are in threaded connection with harness screws. The lower end of the harness cord screw is rotationally connected with the steel bar bracket in a limiting manner; a corrugated pipe fixing frame is fixedly arranged on the steel bar bracket, and is used for limiting and fixing the corrugated pipe; the steel strands penetrate through the inside of the corrugated pipe, and the multiple strands of steel strands are prestressed tendons needing to be tensioned in the prestressed beam. According to the embodiment of the utility model, the steel bar bracket is driven by rotating the harness cord screw rod, so that the prestressed tendons at the corresponding positions along the bridge direction are lifted to the specified height, the accurate positioning of the fixed positions of the prestressed tendons is completed, the construction efficiency of the prestressed tendons of the large-span prestressed beam is improved, and the construction quality is improved.

Description

Technical Field

[0001] The embodiments of the utility model belong to the technical field of stress beam auxiliary devices, and more specifically, relate to a simple bracket device for post-tensioning prestressed tendons of a large-span prestressed beam. Background Art

[0002] Prestressing is the process of pre-applying compressive stress to a structure during construction to improve its performance during use. This allows the structure to fully or partially offset the tensile stress caused by the load during use, preventing structural damage. Therefore, the installation and layout of prestressed tendons are crucial during the construction of prestressed tendons for large-span beams. It is particularly important to quickly secure prestressed tendons and grouting pipes so that they can be adjusted in height and position. Ensuring the accuracy of the prestressed position is a top priority for prestressed concrete structures. The qualified rate for vertical position deviations of curve control points of prestressed tendons should reach 90% or above, especially for large-span prestressed tendons. Due to the influence of their own weight, the vertical position deviations of curve control points are large, and support measures must be taken.

[0003] Currently, there are two main methods for laying and securing prestressed tendons: one is to insert the prestressed tendons after the reinforcement cage is tied inside the beam, and then use galvanized binding wire to tie the tendons to the stirrups or hooks inside the beam; the other is to use a bracket made of welded threaded steel bars, fix the reinforcement bracket while tying the beam reinforcement cage, and then use binding wire to secure the tendons to the reinforcement bracket when laying the prestressed tendons. The first method is less reliable. Because the unbonded prestressed tendons have a smooth surface, the tendons secured using this method are prone to slipping, especially during the concrete pouring and vibration process. The prestressed tendons are more likely to move out of their intended position, making the construction quality of the prestressed beam difficult to guarantee. There are also problems such as low positioning accuracy and loose fixing. In addition, this fixing method requires too much binding and is slow to install. The second method results in significant material waste, a large welding workload, and is time-consuming and labor-intensive, resulting in high construction costs and slow construction speed.

[0004] Therefore, at this stage, there is an urgent need for a simple bracket device for post-tensioning prestressed tendons of large-span prestressed beams, which can reduce the difficulty of prestressed tendon construction operation and fixation, reduce welding and labor, speed up construction progress, reduce construction costs, reduce excessive position deviation caused by the deadweight of large-span prestressed tendons during installation and prestressed tendon displacement caused by concrete construction, and improve construction quality. Summary of the Invention

[0005] Aiming at the problems of low positioning accuracy, loose fixation and slow construction speed of prestressed tendons in the prior art, the utility model provides a simple bracket device for post-tensioning prestressed tendons of large-span prestressed beams to solve such problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a simple support device for post-tensioning prestressed tendons of a large-span prestressed beam, comprising a positioning frame, a threaded screw, a steel bar support, a corrugated pipe fixing frame, a steel strand and a corrugated pipe; wherein, the positioning frame is provided with multiple groups, which are fixed on the main reinforcement of the prestressed beam at intervals along the bridge direction according to needs, and a threaded screw is provided at the bottom thereof; the lower end of the threaded screw is connected to the steel bar support for limited rotation; a corrugated pipe fixing frame is fixed on the steel bar support, and the corrugated pipe fixing frame limits and fixes the corrugated pipe; the steel strand passes through the inside of the corrugated pipe, and the multiple strands of the steel strand are the prestressed tendons that need to be tensioned in the prestressed beam.

[0007] Furthermore, the positioning frame is a U-shaped structure, including a top rod, vertical rods vertically fixed at the bottom of both ends of the top rod; and a connecting rod vertically fixed at the inner side of the vertical rod.

[0008] Furthermore, upper nuts are rotatably provided on the two groups of connecting rods respectively; the upper nuts are threadedly connected to the threaded screws passing through the connecting rods, and the threaded screws are lifted by rotating the upper nuts.

[0009] Furthermore, the steel bar support is a square frame structure, including a top plate, side plates vertically fixed to the bottom of both ends of the top plate, and a bottom plate fixedly connected to the side plates at both ends.

[0010] Furthermore, a bearing plate is horizontally provided on the steel bar support, and multiple groups of bearing plates are provided as needed, with both ends respectively vertically fixedly connected to the side plates to lift the corresponding prestressed bars to the corresponding height.

[0011] Furthermore, a lower nut is fixed at the corresponding position on the top of the steel bar bracket, and an inner thread sleeve is rotatably provided inside the nut. The inner thread sleeve is threadedly connected to the lower end of the threaded screw and is rotated in the lower nut through the inner thread sleeve and is threadedly connected to the threaded screw.

[0012] Furthermore, a level bubble meter is provided on the steel bar support; and a scale display layer is provided on the threaded screw.

[0013] Furthermore, the bellows fixing frame is an arc-shaped structure, the bottom of which is fixed at the corresponding position of the steel bar support, and the curvature of the bellows is adapted to the bellows, thereby limiting and fixing the bellows.

[0014] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0015] (1) The simple support device for prestressed tendons of the present invention solves the problems of inaccurate fixing position and unreliable fixing method of the traditional method of prestressed tendons and the need to insert the corrugated tube after the prestressed beam reinforcement is tied, thereby achieving the technical effect of accelerating the construction efficiency of prestressed tendons in large-span prestressed beams and improving the construction quality.

[0016] (2) The prestressed tendon simple support device of the present utility model adopts a connection method where an upper nut is connected to a through-threaded screw rod to connect the upper and lower components. The position of the lower component can be adjusted quickly and arbitrarily by adjusting the through-threaded screw rod with the upper nut, adapting to different positions with different cross-section requirements, solving the problems that it is difficult to adjust the position of the bellows in the conventional simple support for post-tensioned prestressed tendons of large-span prestressed beams and the construction speed is slow, and achieving the technical effects of improving the installation efficiency of the bellows, expanding the applicable range of the support, and still being able to conveniently adjust the deviation after installation to ensure the finished product quality.

[0017] (3) The prestressed tendon simple support device of the present utility model adopts the technical means of arranging the "U-shaped structure positioning frame 1 on the main reinforcement and fixing it with binding wire, solving the problems such as on-site welding caused by setting traditional supports and the damage to stirrups and tie bars during welding, and achieving the technical effect of ensuring the reliable quality of the prestressed beam steel bars in the project. Description of the Drawings

[0018] Figure 1 is a structural schematic diagram of a simple support device for post-tensioned prestressed tendons of a large-span prestressed beam in an embodiment of the present utility model;

[0019] Figure 2 is a cross-sectional view of the prestressed beam in an embodiment of the present utility model;

[0020] Figure 3 is a curve graph of the layout height of the prestressed tendons along the longitudinal direction of the prestressed beam in an embodiment of the present utility model.

[0021] In all the drawings, the same reference numerals represent the same technical features, specifically: 1 - positioning frame, 2 - through-threaded screw rod, 3 - upper nut, 4 - lower nut, 5 - internal thread sleeve, 6 - steel bar support, 7 - bellows fixing frame, 8 - steel strand, 9 - bellows. Detailed Embodiment

[0022] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] As Figure 1-3As shown in the figure, the utility model provides a simple support device for post-tensioned prestressing tendons of a long-span prestressed beam, which includes a positioning frame 1, a through-thread screw 2, a steel bar support 6, a corrugated pipe fixing frame 7, a steel strand 8 and a corrugated pipe 9. There are multiple groups of the positioning frames 1, which are fixedly arranged on the main reinforcement bars of the prestressed beam at intervals along the bridge longitudinal direction according to requirements, and the through-thread screw 2 is threadedly connected to the bottom thereof; the lower end of the through-thread screw 2 is in limit rotational connection with the steel bar support 6; the corrugated pipe fixing frame 7 is fixedly arranged on the steel bar support 6, and the corrugated pipe 9 is limited and fixed by the corrugated pipe fixing frame 7; the steel strand 8 passes through the inside of the corrugated pipe, and multiple strands of the steel strand 8 are the prestressing tendons to be tensioned in the prestressed beam. In the embodiment of the utility model, by rotating the through-thread screw 2, the steel bar support 6 is driven, so as to lift the prestressing tendons at the corresponding bridge longitudinal positions to the specified height, complete the accurate positioning of the fixing positions of the prestressing tendons, and improve the construction efficiency and quality of the prestressing tendons of the long-span prestressed beam.

[0024] As Figure 2-3 shown, in the embodiment of the utility model, the prestressed beam has a large span. To offset the tensile stress caused by the load, the prestressing tendons are arranged in a curve along the bridge longitudinal direction in the prestressed beam, and the prestressing tendons correspond to different vertical heights at different positions in the bridge longitudinal direction.

[0025] As Figure 1 shown, in the embodiment of the utility model, the positioning frame 1 is in a U-shaped structure, including a top rod, vertical rods perpendicularly and fixedly arranged at the bottoms of both ends of the top rod; and connecting rods perpendicularly and fixedly arranged on the inner sides of the vertical rods; upper nuts 3 are respectively rotatably arranged on the two groups of connecting rods; the upper nuts 3 are threadedly connected to the through-thread screw 2 passing through the connecting rods, and by rotating the upper nuts 3, the through-thread screw 2 is lifted. When the positioning frame is fixed, by drawing a positioning line on the main reinforcement bar and tying the positioning frame 1 with binding wire, multiple positioning frames 1 are fixed on the main reinforcement bar at the specified intervals.

[0026] The steel bar support 6 is in a square frame structure, including a top plate, side plates perpendicularly and fixedly arranged at the bottoms of both ends of the top plate, and a bottom plate respectively fixedly connected to the side plates at both ends.

[0027] [[ID=十六]]Further, according to the different height requirements of the prestressing tendons, a bearing plate is horizontally arranged on the steel bar support 6. There are multiple groups of the bearing plates according to needs, and both ends are perpendicularly and fixedly connected to the side plates, and the corresponding prestressing tendons can be lifted to the corresponding height.

[0028] A lower nut 4 is fixedly arranged at the corresponding position on the top of the steel bar support 6, and an inner thread sleeve ⑤ is rotatably arranged therein. The inner thread sleeve 5 is threadedly connected to the lower end of the through-thread screw 2. By being limited and rotatably arranged in the lower nut 4 and threadedly connected to the through-thread screw 2, when the through-thread screw 2 rises, the steel bar support 6 can be driven to rise.

[0029] In order to prevent the steel support 6 from tilting due to the different lifting heights of the two sets of threaded screws 2, a level bubble meter is also provided on the steel support 6, and the operator can level the steel support 6 by observing the level bubble meter.

[0030] Furthermore, in order to enable the operator to quickly and accurately adjust the prestressed tendons to the corresponding height, a scale indication layer is also provided on the threaded screw 2.

[0031] The bellows fixing frame 7 is an arc-shaped structure, the bottom of which is fixedly arranged at the corresponding position of the steel support 6, and the curvature thereof is adapted to the bellows 9, thereby limiting and fixing the bellows 9.

[0032] The corrugated tube 9 is used to bundle the multiple strands of steel wire 8 and keep the steel wire 8 smooth.

[0033] The prestressed tendon installation method of the present invention mainly comprises the following steps:

[0034] S1. Prestressed tendon material preparation. Prestressed tendons are selected according to the specific drawing requirements. Generally, standard 1×7 steel strand is used, with a diameter determined by design calculations. Before construction, the strands are unwound from the coils and cut with a grinding saw. The fixed ends can be secured with grip-wrapped extrusion anchors, with the most common types being JYM15-N (YMP15-N).

[0035] S2: Preliminary positioning of the bracket; Unlike conventional construction methods, the installation method described in this utility model is to support the main reinforcement of the beam with materials such as wood after the main reinforcement is tied, ensuring that the main reinforcement is straight before installing the bracket and corrugated pipe, rather than installing the prestressed reinforcement corrugated pipe after all the beam reinforcement is tied. The main steps are to place the fixed bracket structure on the main reinforcement by marking the positioning line on the main reinforcement and tying the flat iron 1 on the bracket structure and the main reinforcement with wire, with the bracket spacing of 1000mm; adjust the upper nut 3 and the threaded screw 2, adjust the positioning elevation of the prestressed reinforcement and the net length from the inflection point to the column end, so that the reinforcement bracket is in the appropriate position.

[0036] S3: Install the bellows channel. Select the bellows channel based on the design requirements, typically metal bellows. Starting from the fixed end, insert the bellows channel 9. Secure the bellows 9 to the support structure by threading it through the bellows mounting bracket 7. Ensure the bellows 9 is firmly in place and maintains a smooth, even position. Install anchor pads at both ends of the beam, secured to the formwork.

[0037] S4: Continue with the prestressed beam reinforcement construction. It should be noted that the support elevation needs to be rechecked after the prestressed beam reinforcement construction is completed.

[0038] S5: Prestressed tendons (steel strands) are threaded into the bundle. The steel strands 8 are manually threaded smoothly into the corrugated tube 9, starting from the fixed end and threading them one by one.

[0039] S6: Set the exhaust hole. Drill a hole on the outer surface at the highest point of the corrugated pipe 9, insert the UPVC pipe into the hole, and wrap the UPVC pipe and the corrugated pipe 9 tightly with tape to complete the installation of the prestressed tendon.

[0040] The prestressed tendon simple support device of the present utility model solves the problems that the fixed position of the prestressed tendon in the traditional method is inaccurate, the fixing method is unreliable, and the corrugated pipe can only be inserted after the steel bars of the prestressed beam are tied, and has the technical effects of accelerating the construction efficiency of the prestressed tendons of the long-span prestressed beam and improving the construction quality.

[0041] The prestressed tendon simple support device of the present utility model adopts the connection method of using an upper nut to connect the upper and lower components with a through-threaded screw rod. The position of the lower component can be adjusted quickly and arbitrarily by adjusting the through-threaded screw rod with the upper nut to adapt to different positions with different cross-section requirements, solving the problems that it is difficult to adjust the position of the corrugated pipe and the construction speed is slow for the simple support of the post-tensioned prestressed tendon of the common long-span prestressed beam, and has the technical effects of improving the installation efficiency of the corrugated pipe, expanding the applicable range of the support, and still being able to conveniently adjust the deviation after installation to ensure the finished product quality.

[0042] The prestressed tendon simple support device of the present utility model adopts the technical means of setting the "冂-shaped structure positioning frame 1 on the main steel bars and fixing it with binding wires, solving the problems such as on-site welding and the damage to stirrups and tie bars caused by welding when setting the traditional support, and has the technical effect of ensuring the reliable quality of the steel bars of the prestressed beam in the project.

[0043] Those skilled in the art can easily understand that the above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A simple support device for post-tensioning prestressed tendons of large-span prestressed beams, characterized in that: Including: A positioning frame (1), a through-thread screw rod (2), a steel bar support (6), a corrugated pipe fixing frame (7), a steel strand (8) and a corrugated pipe (9); Among them, multiple groups of the positioning frames (1) are provided, which are fixedly arranged on the main prestressed beam steel bars at intervals along the bridge longitudinal direction according to requirements, and a through-thread screw rod (2) is threadedly connected to the bottom thereof; the lower end of the through-thread screw rod (2) is in a limit rotation connection with the steel bar support (6); a corrugated pipe fixing frame (7) is fixedly arranged on the steel bar support (6), and the corrugated pipe (9) is limited and fixed by the corrugated pipe fixing frame (7); the steel strand (8) passes through the inside of the corrugated pipe, and multiple strands of the steel strand (8) are the prestressed tendons to be tensioned in the prestressed beam.

2. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to claim 1, characterized in that: The positioning frame (1) is of a U-shaped structure, including a top rod, vertical rods vertically and fixedly arranged at both ends of the bottom of the top rod; and connecting rods vertically and fixedly arranged inside the vertical rods.

3. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to claim 2, characterized in that: Upper nuts (3) are respectively rotatably arranged on two groups of the connecting rods; the upper nuts (3) are threadedly connected to the through-thread screw rod (2) passing through the connecting rods, and by rotating the upper nuts (3), the through-thread screw rod (2) is lifted.

4. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to any one of claims 1 to 3, characterized in that: The steel bar support (6) is of a square frame structure, including a top plate, side plates vertically and fixedly arranged at both ends of the bottom of the top plate, and a bottom plate respectively fixedly connected to the side plates at both ends.

5. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to claim 4, characterized in that: A bearing plate is horizontally arranged on the steel bar support (6), and multiple groups of the bearing plates are provided according to needs, and both ends are respectively vertically and fixedly connected to the side plates, lifting the corresponding prestressed tendons to the corresponding height.

6. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to claim 4, characterized in that: Lower nuts (4) are fixedly arranged at corresponding positions on the top of the steel bar support (6), an inner thread sleeve (5) is rotatably arranged inside the lower nuts (4), and the inner thread sleeve (5) is threadedly connected to the lower end of the through-thread screw rod (2), and is limited and rotatably arranged inside the lower nuts (4) and threadedly connected to the through-thread screw rod (2).

7. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to any one of claims 1 to 3, characterized in that: A horizontal bubble level is also arranged on the steel bar support (6); a scale display layer is also arranged on the through-thread screw rod (2).

8. A simple support device for post-tensioning prestressed tendons of a large-span prestressed beam according to any one of claims 1 to 3, characterized in that: The corrugated pipe fixing frame (7) is of an arc structure, and its bottom is fixedly arranged at the corresponding position of the steel bar support (6), and its radian is adapted to the corrugated pipe (9) to limit and fix the corrugated pipe (9).

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