Pre-stressed anchor cable structure of large-span frame beam

Abstract

The pre-stressed anchor cable structure of the large-span frame beam comprises pre-stressed anchor cables, the frame beam and frame columns, the two ends of the frame beam are fixedly connected with the frame columns, and the pre-stressed anchor cables are embedded in the frame beam in the length direction of the frame beam in a penetrating mode. Anchorage structures are mounted at the two ends of the pre-stressed anchor cable and used for adjusting the tensioning state of the pre-stressed anchor cable; the anchorage device structure comprises fixed anchor bearing plates, movable anchor bearing plates and bolt spring pre-tightening mechanisms, the fixed anchor bearing plates are attached to the end faces of the two ends of the frame beam, and the movable anchor bearing plates are located on the outer sides of the fixed anchor bearing plates. The end of the pre-stressed anchor cable sequentially penetrates through the fixed anchor bearing plate and the movable anchor bearing plate and then is fixed to the outer side of the movable anchor bearing plate through a bolt spring pre-tightening mechanism. By arranging the anchorage device structure, the tensioning state of the pre-stressed anchor cable can be conveniently monitored and adjusted during later maintenance of a building.

Description

Technical Field

[0001] The utility model relates to the technical field of frame beam construction, in particular to a prestressed anchor cable structure of a large-span frame beam. Background Art

[0002] A long-span frame refers to a frame with a span of no less than 18m. This structural form is characterized by being able to span a large distance without the need for intermediate supports. In construction projects, long-span frames are often used to build large venues, bridges, hangars, exhibition halls and other buildings. As an important form of building structure, long-span frames play a key role in large-scale construction projects. Through continuous technological innovation and improvement, the performance and application scope of long-span frame structures will be further improved.

[0003] Reinforced concrete is the most commonly used material for traditional building frame structures. However, due to the lack of tensile and bending resistance of reinforced concrete structures, and the large span of large-span frame beams, cracks are prone to appear at frame beams without structural column support at the bottom after being subjected to large loads, affecting the safety and quality of the building. When designing and constructing large-span frames, in order to ensure the safety and stability of the structure, prestressed anchor cables are generally installed inside the frame beams to apply prestress to the frame beams, thereby alleviating the load pressure.

[0004] The patent with application number CN202310933285.3 discloses a prestressed concrete axilted beam-slab floor structure, comprising a plurality of frame columns distributed in a rectangular column grid, continuous frame beams arranged longitudinally and transversely along the rectangular column grid, and floor slabs arranged between the frame beams, wherein the frame beam ends have vertical axils and the floor slab supports have vertical axils.

[0005] The ends of existing prestressed anchor cables are generally tensioned and fixed by fixed anchors and the tensioned state is maintained for a long time, and the applied prestress cannot be adjusted. However, as the span (length) of the frame beam of a large-span building frame structure changes with the ambient temperature, the prestress applied by the anchor cable changes. Therefore, it is necessary to adjust the tension state of the anchor cable, that is, to correct and adjust the prestress applied by the anchor cable. Therefore, it is urgent to design a prestressed anchor cable structure for large-span frame beams with adjustable prestress.

[0006] Therefore, we propose a prestressed anchor cable structure suitable for large-span frame beams to solve the above problems. Utility Model Content

[0007] In order to solve the above problems existing in the prior art, the utility model provides a prestressed anchor cable structure of a large-span frame beam.

[0008] The technical solution of the utility model is as follows:

[0009] A prestressed anchor cable structure for a large-span frame beam comprises a prestressed anchor cable, a frame beam and a frame column, both ends of the frame beam are fixedly connected to the frame column, the prestressed anchor cable is pre-buried and penetrated inside the frame beam along the length direction of the frame beam, and anchor structures are installed at both ends of the prestressed anchor cable to adjust the tensioning state of the prestressed anchor cable; the anchor structure comprises a fixed anchor plate, a movable anchor plate and a bolt spring pre-tensioning mechanism, the fixed anchor plate is attached to the end surface of both ends of the frame beam, the movable anchor plate is located on the outside of the fixed anchor plate, and hinge seats are respectively arranged on the movable anchor plate and the fixed anchor plate, and the two hinge seats are hingedly arranged by a hinge pin; the end of the prestressed anchor cable passes through the fixed anchor plate and the movable anchor plate in turn and is fixed to the outside of the movable anchor plate by the bolt spring pre-tensioning mechanism.

[0010] Preferably, the movable anchor plate is in an inverted triangular structure, and holes are opened on the left and right sides of the upper part of the movable anchor plate, and clips are provided at the holes for stopping and fixing, and the clips are sleeved on the ends of the prestressed anchor cables.

[0011] Preferably, the clip is a frustum structure formed by splicing two or three petals, and a through hole matching the prestressed anchor cable is provided on the clip.

[0012] Preferably, the bolt spring pre-tensioning mechanism includes a screw rod, a butterfly spring and a double nut. One end of the screw rod is fixedly installed under the fixed anchor plate, and the other end passes through the bottom of the movable anchor plate and is sleeved with a group of butterfly springs. The outer side of the butterfly spring is threadedly connected to the double nut.

[0013] Preferably, before casting the frame beam, a pre-buried pipe is arranged according to the trajectory of the prestressed anchor cable, and after the frame beam is cast and formed, the prestressed anchor cable is passed through the pre-buried pipe.

[0014] Preferably, a spiral rib is provided on the side of the fixed anchor plate facing away from the movable anchor plate, and the spiral rib is buried inside the frame beam.

[0015] The utility model has the following beneficial effects: the utility model can facilitate the monitoring and adjustment of the tensioning state of the prestressed anchor cable during the later maintenance of the building by arranging the anchor structure; at the same time, the anchor structure in the device can be adjusted according to the prestressed anchor cable in different tensioning states, thereby alleviating the situation where the prestressed anchor cable is over-tightened or over-relaxed, and the tightness can be judged by observing the axial length of the butterfly spring in the bolt spring pretensioning mechanism, so as to make appropriate adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 For the utility model Figure 1A partial enlarged view of the middle A;

[0018] Figure 3 It is a structural schematic diagram of the movable anchor pad of the utility model.

[0019] The reference numerals in the figure represent:

[0020] 1. Floor slab; 2. Frame beam; 3. Prestressed anchor cable; 4. Frame column; 5. Anchor structure; 501. Fixed anchor plate; 502. Movable anchor plate; 503. Clip; 504. Bolt spring preload mechanism; 5041. Screw; 5042. Butterfly spring; 5043. Double nut; 505. Hinge seat; 506. Hinge pin; 507. Spiral reinforcement; 6. Embedded pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figures 1 to 3 Because the transverse span of the frame beam 2 is greater than 18 meters, it is called a long-span frame beam. A prestressed anchor cable structure of a long-span frame beam includes a prestressed anchor cable 3, a frame beam 2 and a frame column 4. Both ends of the frame beam 2 are fixedly connected to the frame column 4. The prestressed anchor cable 3 is pre-buried and penetrated inside the frame beam 2 along the length direction of the frame beam 2. Anchor structures 5 are installed at both ends of the prestressed anchor cable 3 to adjust the tension state of the prestressed anchor cable 3; see Figure 1 The top of the frame beam 2 is the floor 1, and both ends of the frame beam 2 are supported by frame columns 4. Before the frame beam 2 is cast, the embedded pipe 6 is set according to the trajectory of the prestressed anchor cable 3. After the frame beam 2 is cast, the prestressed anchor cable 3 is passed through the embedded pipe 6.

[0023] The anchor structure 5 includes a fixed anchor plate 501, a movable anchor plate 502 and a bolt spring pre-tensioning mechanism 504. The fixed anchor plate 501 is attached to the end faces of the two ends of the frame beam 2, and the movable anchor plate 502 is located on the outer side of the fixed anchor plate 501. The movable anchor plate 502 and the fixed anchor plate 501 are respectively provided with hinge seats 505, and the two hinge seats 505 are hingedly connected by a hinge pin 506; the end of the prestressed anchor cable 3 passes through the fixed anchor plate 501 and the movable anchor plate 502 in turn and is fixed to the outer side of the movable anchor plate 502 through the bolt spring pre-tensioning mechanism 504.

[0024] Furthermore, the movable anchor plate 502 is in an inverted triangular structure, and holes are opened on the left and right sides of the upper part of the movable anchor plate 502, and clips 503 are provided at the holes for stopping and fixing, and the clips 503 are sleeved on the ends of the prestressed anchor cables 3.

[0025] Furthermore, the clip 503 is a frustum structure formed by splicing two or three petals, and a through hole matching the prestressed anchor cable 3 is provided on the clip 503 .

[0026] Furthermore, the bolt spring pre-tensioning mechanism 504 includes a screw rod 5041, a butterfly spring 5042 and a double nut 5043. One end of the screw rod 5041 is fixedly installed under the fixed anchor plate 501, and the other end passes through the bottom of the movable anchor plate 502 and is sleeved with a group of butterfly springs 5042. The outer side of the butterfly spring 5042 is threadedly connected to the double nut 5043.

[0027] Furthermore, a spiral rib 507 is provided on the side of the fixed anchor plate 501 facing away from the movable anchor plate 502 , and the spiral rib 507 is buried inside the frame beam 2 .

[0028] The working principle of this utility model:

[0029] In the present invention, firstly, the lateral distribution track of the prestressed anchor cable 3 is installed as follows: Figure 1 As shown, it is an arc-shaped parabola structure with a sinking middle and rising ends. Its purpose is to match the stress distribution of the overall structure of the frame beam 2, with a trend of gradually decreasing from the middle to the two ends. Therefore, in the utility model, two prestressed anchor cables 3 can be arranged side by side in parallel. The top of the frame beam 2 is the floor 1, and the two ends of the frame beam 2 are supported by the frame columns 4. Before the frame beam 2 is cast, a pre-buried pipe 6 is arranged according to the trajectory of the prestressed anchor cable 3. After the frame beam 2 is cast and formed, the prestressed anchor cable 3 is passed through the pre-buried pipe 6. Anchor structures 5 are installed at both ends of the prestressed anchor cable 3 to adjust the tension state of the prestressed anchor cable 3, so that the prestressed anchor cable 3 is applied with an upward prestress in advance before the building is put into use. After the building is put into use, it can offset the stress generated by the downward load on the frame beam 2, thereby reducing the stress borne by the frame beam 2;

[0030] Because the structure of the large-span frame beam 2 will be affected by the external ambient temperature, the span (length) of the frame beam 2 will change to varying degrees, so the prestressed anchor cable 3 is adjusted by the anchor structure 5; the anchor structure 5 includes a fixed anchor pad 501, a movable anchor pad 502 and a bolt spring preload mechanism 504, the fixed anchor pad 501 is attached to the end surface of the two ends of the frame beam 2, the movable anchor pad 502 is located on the outside of the fixed anchor pad 501, and the movable anchor pad 502 and the fixed anchor pad 501 are respectively provided with hinge seats 505, and the two hinge seats 505 are hingedly connected by a hinge pin 506; a spiral rib 507 is provided on the side of the fixed anchor plate 501 away from the movable anchor plate 502, and the spiral rib 507 is buried inside the frame beam 2; the movable anchor plate 502 is an inverted triangular structure, and holes are opened on the left and right sides of the upper part of the movable anchor plate 502, and a clip 503 is provided at the hole for stopping and fixing, and the clip 503 is sleeved on the end of the prestressed anchor cable 3; and the clip 503 is a frustum structure composed of two or three petals, and a through hole that matches the prestressed anchor cable 3 is opened on the clip 503;

[0031] During installation, the end of the prestressed anchor cable 3 passes through the fixed anchor plate 501 and the movable anchor plate 502 in turn and is fixed to the outer side of the movable anchor plate 502 through the bolt spring pre-tightening mechanism 504; the end of the prestressed anchor cable 3 is sleeved with a clip 503, and the clip 503 uses its conical shape to clamp on the outer side of the movable anchor plate 502, thereby playing a role of stopping and fixing.

[0032] The bolt spring pre-tightening mechanism 504 includes a screw rod 5041, a butterfly spring 5042 and a double nut 5043. One end of the screw rod 5041 is fixedly installed below the fixed anchor plate 501, and the other end passes through the bottom of the movable anchor plate 502 and is sleeved with a group of butterfly springs 5042. The outer side of the butterfly spring 5042 is threadedly connected to the double nut 5043.

[0033] During actual installation, the bolt spring pre-tensioning mechanism 504 is first adjusted to the normal loose and tight state position (which can be further tightened or further loosened), and the prestressed anchor cable 3 is tensioned and adjusted using the practical anchor cable tensioning instrument. After the prestressed anchor cable 3 reaches the qualified state of initial tensioning, the building can be put into use; during the use of the building, the temperature will change in different environments or seasons, and due to the different ratios of thermal expansion and contraction between the reinforced concrete structure and the steel cable anchor cable structure, the tensioning state of the prestressed anchor cable 3 will change differently at this time. The operator can make a judgment by observing the butterfly spring 5042. If the axial length of the butterfly spring 5042 is elongated, it means that the prestressed anchor cable is too loose. Otherwise, it is too tight. At this time, the tensioning state of the prestressed anchor cable 3 can be adjusted. When adjusting, the double nut 5043 is turned to restore the butterfly spring 5042 to the length of the initial tensioning state.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A prestressed anchor cable structure for a large-span frame beam, comprising a prestressed anchor cable (3), a frame beam (2) and a frame column (4), characterized in that: Both ends of the frame beam (2) are fixedly connected to frame columns (4); the prestressed anchor cable (3) is pre-buried and penetrated into the frame beam (2) along the length direction of the frame beam (2); anchor structures (5) are installed at both ends of the prestressed anchor cable (3) for adjusting the tension state of the prestressed anchor cable (3); the anchor structure (5) comprises a fixed anchor plate (501), a movable anchor plate (502) and a bolt spring pre-tightening mechanism (504); the fixed anchor plate (501) is attached to the frame beam ( 2) The end faces of both ends are arranged, the movable anchor plate (502) is located on the outside of the fixed anchor plate (501), and hinge seats (505) are respectively arranged on the movable anchor plate (502) and the fixed anchor plate (501), and the two hinge seats (505) are hingedly arranged by a hinge pin (506); the end of the prestressed anchor cable (3) passes through the fixed anchor plate (501) and the movable anchor plate (502) in turn, and is fixed to the outside of the movable anchor plate (502) by a bolt spring pre-tightening mechanism (504).

2. The prestressed anchor cable structure of a large-span frame beam according to claim 1, characterized in that: The movable anchor pad (502) is in an inverted triangular structure, and holes are opened on the left and right sides of the upper part of the movable anchor pad (502), and clips (503) are arranged at the holes for stopping and fixing, and the clips (503) are sleeved on the ends of the prestressed anchor cables (3).

3. The prestressed anchor cable structure of a large-span frame beam according to claim 2, characterized in that: The clip (503) is a frustum structure formed by splicing two or three petals, and a through hole matching the prestressed anchor cable (3) is provided on the clip (503).

4. The prestressed anchor cable structure of a large-span frame beam according to claim 1, characterized in that: The bolt spring pre-tightening mechanism (504) comprises a screw rod (5041), a butterfly spring (5042) and a double nut (5043); one end of the screw rod (5041) is fixedly installed below the fixed anchor plate (501); the other end passes through the bottom of the movable anchor plate (502) and is sleeved with a group of butterfly springs (5042); the outer side of the butterfly spring (5042) is threadedly connected to the double nut (5043).

5. The prestressed anchor cable structure of a large-span frame beam according to claim 1, characterized in that: Before the frame beam (2) is cast, a pre-buried pipe (6) is arranged according to the trajectory of the pre-stressed anchor cable (3); after the frame beam (2) is cast and formed, the pre-stressed anchor cable (3) is passed through the pre-buried pipe (6).

6. The prestressed anchor cable structure of a large-span frame beam according to claim 1, characterized in that: A spiral rib (507) is provided on the side of the fixed anchor plate (501) facing away from the movable anchor plate (502), and the spiral rib (507) is embedded in the frame beam (2).

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