A prestressed beam string tensioning structure and tensioning method thereof

Abstract

The present invention provides a prestressed string beam tensioning end structure, including a fixed plate and a movable plate, the fixed plate and the movable plate have the same structure and are connected by a through screw, the fixed plate includes a first plate, a second plate and a third plate that are integrally welded and arranged in sequence, the first plate, the second plate and the third plate are all rectangular structures, a U-shaped opening is arranged on one side of the first plate, a second hole is arranged in the center of the second plate, and the third plate is formed by docking two symmetrically arranged plates, and a third hole is formed in the middle; the second hole and the third hole are through holes with an arc structure corresponding to the U-shaped opening on one side and a closed side on the other side; the four corner edges of the first plate, the second plate and the third plate are provided with corresponding positioning holes. The present invention has a simple structure, adopts reasonable tooling and fixtures, is simple and convenient to operate, and has low work intensity; it reduces construction costs and increases social benefits.

Description

Technical Field

[0001] The invention relates to the field of construction, and in particular to a prestressed beam-string tensioning structure and a tensioning method thereof. Background Art

[0002] The beam string structure is a new type of hybrid structure composed of rigid components, flexible cables and intermediate struts. It is a type of large-span spatial structure. In actual application, the force principle of the beam string structure is mainly through the prestress applied by the lower chord cable of the flexible component during use, which makes the rigid upper chord component produce anti-deflection, and the deflection is reduced under the action of the building load, so that the building structure presents a state of balance. At present, prestressed beam string structure is widely used in large-span engineering construction. It not only effectively improves the stability and reliability of the building structure, but also effectively improves the quality of the construction project. However, with the continuous changes of the times, the disadvantages of prestressed beam string in engineering construction are becoming more and more obvious, which requires certain reforms and innovations in its construction technology. Only in this way can the construction quality of construction projects be effectively improved and the development of my country's construction industry be promoted.

[0003] The existing tensioning method of the string beam generally adopts clamping the ear plate and the upper end of the adjusting rod for tensioning, which is complex in structure and inconvenient to implement; or using a steel tension rod for tensioning, which is bulky in structure and labor-intensive during tensioning. Therefore, it is necessary to design a tensioning structure and tensioning method with simple structure and convenient operation. Summary of the invention

[0004] The invention provides a tensioning structure of a tensioning end of a beam string, which has a simple structure and is easy to install; and also provides a tensioning method using the tensioning end structure, which has simple operation and low labor intensity.

[0005] According to a first aspect of the present invention, a tensioning structure for a tensioning end of a prestressed tensioned beam is proposed, comprising a fixed plate and a movable plate, wherein the fixed plate and the movable plate have the same structure and are connected by through-screws, wherein the fixed plate comprises a first plate, a second plate and a third plate which are integrally welded and arranged in sequence, wherein the first plate, the second plate and the third plate are all rectangular structures, a U-shaped opening is arranged on one side of the first plate, a second hole is arranged in the center of the second plate, and the third plate is formed by docking two symmetrically arranged plates with a third hole formed in the middle; the second hole and the third hole are through holes with an arc structure corresponding to the U-shaped opening arranged on one side and closed on the other side; corresponding positioning holes are arranged on the four corner edges of the first plate, the second plate and the third plate.

[0006] Another aspect of the present invention provides a prestressed beam string tensioning method, using the above-mentioned prestressed beam string tensioning end structure, comprising the following steps:

[0007] S1. Determine the size specifications of the first plate, the second plate and the third plate according to the cable body specifications and the structural dimensions of the tensioning end ear plate;

[0008] S2, processing the first plate, the second plate and the third plate;

[0009] S3. Place the first plate on the bottom layer, the second plate on the second layer, and the third plate on the third layer; after aligning the positioning holes, weld the first plate, the second plate, and the third plate together; weld two pieces in total, namely the fixed plate and the movable plate;

[0010] S4. Hang the fixed plate on the pin of the tension end ear plate and fix it with a fixture, and connect the movable plate to the outside of the fixed plate with a through screw;

[0011] S5. Pass the tensile steel strand through the center holes of the fixed plate and the movable plate in sequence, and fix it on the outside of the movable plate;

[0012] S6. Use the calibrated jack to perform tensioning operations.

[0013] The invention has a simple structure, adopts a reasonable tooling fixture, uses a U-shaped opening to position the tensioning tooling itself, and can realize the tensioning operation by using only a calibrated jack. The operation is simple and convenient, and the work intensity is low; the construction cost is reduced and the social benefit is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of a tensioning end structure of a prestressed beam string in an embodiment of the present invention.

[0015] Figure 2 Schematic diagram of a first plate structure of a prestressed beam string tensioning end structure in an embodiment of the present invention.

[0016] Figure 3 Schematic diagram of a second plate structure of a prestressed beam string tensioning end structure in an embodiment of the present invention.

[0017] Figure 4 Schematic diagram of the third plate structure of a prestressed beam string tensioning end structure in an embodiment of the present invention.

[0018] The reference numerals are as follows:

[0019] 1. First plate; 2. Second plate; 3. Third plate; 4. U-shaped hole; 5. Second hole; 6. Third hole; 7. Fixed plate; 8. Movable plate; 9. Screw. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] like Figure 1-Figure 4 As shown, a prestressed tensioned beam tensioning end structure includes a fixed plate 7 and a movable plate 8, the fixed plate 7 and the movable plate 8 have the same structure and are connected by a through screw 9, the fixed plate 7 includes a first plate 1, a second plate 2 and a third plate 3 that are integrally welded and arranged in sequence, the first plate 1, the second plate 2 and the third plate 3 are all rectangular structures, a U-shaped opening is provided on one side of the first plate 1, a second hole 5 is provided in the center of the second plate 2, the third plate 3 is formed by butt-jointing two symmetrically arranged plates, and a third hole 6 is formed in the middle; the second hole 5 and the third hole 6 are through holes with an arc structure corresponding to the U-shaped opening provided on one side and closed on the other side; the four corner edges of the first plate 1, the second plate 2 and the third plate 3 are provided with corresponding positioning holes.

[0022] like Figure 1 As shown, the fixed plate 7 and the movable plate 8 each include at least one first plate 1 and at least one third plate 3 , and at least two second plates 2 disposed between the first plate 1 and the third plate 3 .

[0023] like Figure 2-Figure 4 As shown, the first plate 1, the second plate 2 and the third plate 3 are all rectangular plates with the same size and shape.

[0024] like Figure 4 As shown, a gap is formed at the joint of the third plate 3 .

[0025] A method for tensioning a prestressed beam string tensioning end structure according to this embodiment includes the following steps:

[0026] S1. Determine the size specifications of the first plate 1, the second plate 2 and the third plate 3 according to the cable body specifications and the structural dimensions of the tensioning end ear plate;

[0027] S2, processing the first plate 1, the second plate 2 and the third plate 3;

[0028] S3, place the first plate 1 on the bottom layer, the second plate 2 on the second layer, and the third plate 3 on the third layer; after aligning the positioning holes, weld the first plate 1, the second plate 2 and the third plate 3 together; weld two pieces in total, namely the fixed plate 7 and the movable plate 8;

[0029] S4, hang the fixed plate 7 on the pin of the tension end ear plate, fix it with a jig, and connect the movable plate 8 to the outer side of the fixed plate 7 with the through screw 9;

[0030] S5, passing the tensile steel strand through the center holes of the fixed plate 7 and the movable plate 8 in sequence, and fixing it on the outside of the movable plate 8;

[0031] S6. Use the calibrated jack to perform tensioning operations.

[0032] Specifically, a jack is placed between the fixed plate and the movable plate 8, and the through screw 9 is loosened so that the screw 9 plays a guiding role. The jacking force of the jack is used to increase the distance between the movable plate 8 and the fixed plate 7, thereby playing a tensioning role.

[0033] In the method, the welding method in step S3 is full edge welding.

[0034] In the method, in step S5, the fixing device of the steel strand is clamped in the gap of the third plate 3. The fixing device can be set as needed, and is generally set as a pull ring with a self-locking mechanism, one end of the pull ring is fixed to the steel strand, and the other end is fixed to the locking rod, and the locking rod is clamped in the gap to prevent the steel strand from rotating during tensioning.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed beam string tension end structure, characterized in that: It includes a fixed plate and a movable plate, the fixed plate and the movable plate have the same structure and are connected by through screws, the fixed plate includes a first plate, a second plate and a third plate which are integrally welded and arranged in sequence, the first plate, the second plate and the third plate are all rectangular structures, a U-shaped opening is arranged on one side of the first plate, a second hole is arranged in the center of the second plate, and the third plate is formed by connecting two symmetrically arranged plates, and a third hole is formed in the middle; the second hole and the third hole are arc structures corresponding to the U-shaped opening on one side and through holes closed on the other side; corresponding positioning holes are arranged on the four corner edges of the first plate, the second plate and the third plate; the fixed plate and the movable plate each include at least one first plate and at least one third plate, and at least two second plates arranged between the first plate and the third plate; the first plate, the second plate and the third plate are all rectangular plates of the same size and shape; a gap is formed at the connecting part of the third plate.

2. A method for tensioning a prestressed beam string tension end structure, characterized in that: The prestressed beam string tensioning end structure according to claim 1 comprises the following steps: S1. Determine the size specifications of the first plate, the second plate and the third plate according to the cable body specifications and the structural dimensions of the tensioning end ear plate; S2, processing the first plate, the second plate and the third plate; S3. Place the first plate on the bottom layer, the second plate on the second layer, and the third plate on the third layer; after aligning the positioning holes, weld the first plate, the second plate, and the third plate together; weld two pieces in total, namely the fixed plate and the movable plate; S4. Hang the fixed plate on the pin of the tension end ear plate and fix it with a fixture, and connect the movable plate to the outside of the fixed plate with a through screw; S5. Pass the tensile steel strand through the center holes of the fixed plate and the movable plate in sequence, and fix it on the outside of the movable plate; S6. Use the calibrated jack to perform tensioning operations.

3. A method for tensioning a prestressed beam string tensioning end structure according to claim 2, characterized in that: The welding method in step S3 is full edge welding.

4. A method for tensioning a prestressed beam string tensioning end structure according to claim 2, characterized in that: In step S5, the fixing device of the steel strand is clamped in the gap of the third plate.

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