Steel strand tensioning device for beam string structure

Abstract

The utility model discloses a steel strand tensioning device for beam string structure, including steel strand, the end of steel strand is the cable head, and the cable head is connected with the sleeve with internal thread, and the beam string structure has the anchoring end, and the sleeve and steel strand are connected, still include a clamp, and the clamp is assembled by the bolt connection of left and right two pieces, the sleeve and cable head are rotationally connected, and the anchoring end has external thread, and the internal thread of sleeve is matched. The utility model can realize the sleeve of steel strand and beam string structure connecting part and realize the folding, reduce the air contact, and delay the corrosion, and the whole device adopts the assembly assembly, and the construction is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular relates to a steel strand tensioning device for tensioned beams. Background Technology

[0002] A tensioned beam structure is a hybrid structure composed of rigid members, flexible cables, and struts, belonging to the category of large-span spatial structures. The equilibrium state of a large-span tensioned beam structure is achieved through the tensioning of prestressed steel strands, and the accuracy of the prestressing applied to the steel strands directly affects the structural safety.

[0003] The closest prior art to this utility model is described in CN221646425U, which relates to a prestressing tensioning device for cables of long-span tensioned beams, see appendix. Figure 1 It includes a cable head 9, one side of which is connected to a cable anchoring end 10, and the other side is connected to a cable 8; at least one U-shaped buckle 1 is provided on the cable anchoring end 10; a support frame 3 is provided on the cable 8; a tension rod 2 is provided above and below the cable head 9; one end of the tension rod 2 passes through the support frame 3 and is connected to a jack 4, and the output end of the jack 4 pushes against the support frame 3; the other end of the tension rod 2 is connected to one end of the U-shaped buckle 1 through a reaction frame 7. Specifically, the jack 4 is a hollow jack, and one end of the tension rod 2 passes through the support frame 3 and the hollow jack in sequence and is fixed by bolt 5. The support frame 3 is made of two symmetrical frame bodies; the frame bodies are welded together by a main steel plate 31, a head plate 32, and a stiffening plate 33, and the upper and lower ends of the main steel plate 31 are provided with connecting ear plates 34. The connecting ear plates 34 on the two frame bodies are fixed to the cable 8 after being locked with bolts. Two sets of U-shaped buckles 1 are symmetrically arranged, and one end of each U-shaped buckle 1 is fixed to the two ends of the reaction frame 7 by bolt 6. The end of the tension rod 2 is fixed to the middle of the reaction frame 7 by bolt 14. The U-shaped buckle 1 includes: a wire rope 11, a steel sleeve 12, and a screw 13; the two ends of the steel sleeve 12 are fixedly connected to the wire rope 11 and the screw 13 by buckles. Furthermore, the screw 13 and the bolt 6 are threaded together for locking.

[0004] The existing technical document does not disclose two key pieces of information, but these are essential practices in actual use. First, the anchoring end 10 of the cable is connected to the tension beam, i.e., connected to a rigid component. Second, the anchoring end 10 and the cable head 9 are connected by threads. Specifically, the connector between the anchoring end 10 and the cable head 9 has double-ended external threads in both directions, and each has a sleeve with internal threads, thus forming a threaded connection. After the tensioning device is fixed in place, a hydraulic jack on the right side of the device pushes the steel cable forward, and a wrench is used to tighten it between the two sleeves. The sleeves on both sides contract simultaneously, achieving prestressing tension.

[0005] The drawback of the existing technology is that the sleeves cannot rotate when prestressing is applied; only the connecting piece between the two sleeves can be turned with a special tool (as described in paragraph 0026 of the aforementioned document). Therefore, the two sleeves cannot be completely closed, and the middle part will be exposed, commonly known as exposed wire. When the exposed part is exposed to air for a long time, it is prone to corrosion and other problems, which accelerates the attenuation of prestress and creates safety hazards. Summary of the Invention

[0006] The purpose of this invention is to provide a steel strand tensioning device for tensioned beams, which enables the sleeves to rotate, achieving complete closing between the sleeves and reducing the contact between the steel threaded section and air.

[0007] The technical solution adopted by this utility model is as follows: a steel strand tensioning device for a tensioned beam includes a steel strand, the end of which is a cable head, and the cable head is connected to a sleeve with internal threads; the tensioned beam has an anchoring end, which is connected to the sleeve and the steel strand; the device is characterized by further including a clamp, which is assembled from two pieces connected by bolts, the left and right pieces of the clamp each having a groove, thereby forming a through hole for the steel strand to pass through after assembly, and the clamp and the steel strand are pressed and fixed by tightening the bolts; each of the two clamp pieces has a small longitudinal hole at the top and bottom, and two ropes pass through the small holes at the top and bottom of the two clamp pieces respectively, forming a rotating U-shape, and the anchoring end is fitted in the U-shape; the sleeve and the cable head are rotatably connected, that is, the cable head extends into the sleeve, and the sleeve can rotate circumferentially relative to the cable head; the end of the anchoring end has an external thread, which cooperates with the internal thread of the sleeve.

[0008] Furthermore, the grooved surfaces of the two clamps are rough surfaces.

[0009] In operation, this invention uses a jack to push the clamp towards the anchoring end. This can also be understood as the jack pressing against the clamp, tensioning the free end of the rope, thus tightening the rope. This causes the clamp to move the steel strand closer to the anchoring end, achieving the effect of tensioning the steel strand. Simultaneously, the sleeve is tightened to achieve a threaded connection with the anchoring end. Because the sleeve and the cable head are in a rotating fit, tightening the sleeve does not cause circumferential rotation of the cable head, but rather axial tension.

[0010] The advantages of this invention are that it allows the sleeve at the connection between the steel strand and the tensioned beam to be closed, reducing air contact and delaying corrosion. Furthermore, the entire device is assembled from components, making construction convenient. Attached Figure Description

[0011] Figure 1 This is an attached diagram of a tensioning device in the background art.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] Figure 3 This is a diagram of the clamps and ropes.

[0014] Figure 4 This is a schematic diagram of the sleeve and cable head. Detailed Implementation

[0015] See Figures 2 to 4 This embodiment includes a tension beam 11 and a steel strand 12. An anchoring end 13 is connected to the tension beam, and its end has external threads. The end of the steel strand is a cable head 121, which is connected to a sleeve 14. The diameter of the cable head 121 is larger than the diameter of the steel strand 12 and also larger than the opening at the right end of the sleeve 14, so that the cable head will not come out of the opening at the right end of the sleeve; and the sleeve 14 can rotate circumferentially relative to the cable head 121.

[0016] This embodiment also includes a clamp 15 and ropes 16. The clamp 15 consists of a left piece 151 and a right piece 152, which are clamped together by several bolts 153. Each of the left and right pieces 151 and 152 has a groove with a rough surface, which can be assembled to form a through hole 154 for the steel strand 112 to pass through. At the same time, the clamp 15 clamps the steel strand 12 to fix them in place. There is a small hole at the top and bottom of each clamp. The two ropes 16 pass through a pair of small holes to form a U-shape. The anchoring end 13 is fitted into the U-shape, and the free end of the rope extends out of the clamp.

[0017] In this embodiment, a jack is used to hold the clamp 15, and the free end of the rope 16 is pulled to tighten the rope. This causes the clamp 15, along with the cable head 121 and the steel strand 12, to move closer to the anchoring end 13, achieving the effect of tensioning the steel strand. At the same time, the sleeve 14 is tightened to achieve a threaded connection with the anchoring end 13.

Claims

1. A steel strand tensioning device for a tensioned beam, comprising a steel strand, the end of which is a cable head connected to a sleeve with internal threads; the tensioned beam has an anchoring end connected to the sleeve and the steel strand; characterized in that: It also includes a clamp, which is assembled from two pieces connected by bolts. Each of the left and right clamp pieces has a groove, thus forming a through hole for the steel strand to pass through after assembly. The clamp and the steel strand are pressed and fixed by tightening the bolts. Each of the two clamp pieces has a small longitudinal hole at the top and bottom. The two ropes pass through the small holes at the top and bottom of the two clamp pieces respectively, forming a U-shape, and the anchoring end is fitted into the U-shape. The sleeve and the rope head are rotatably connected, that is, the rope head extends into the sleeve, and the sleeve can rotate circumferentially relative to the rope head. The end of the anchoring end has an external thread that mates with the internal thread of the sleeve.

2. The steel strand tensioning device for a tensioned beam as described in claim 1, characterized in that: The grooved surfaces of the two clamps are rough surfaces.

Images