Device for tensioning pageboy valve
(57) Abstract:Device for tensioning pageboy valve comprising a cylinder with the rod and grip pageboy valve equipped with an additional hydraulic cylinder, which is located at the front of the device with the possibility of its interaction with the element of crimp fittings. The capture is made in the form of a cage with conical holes in the liners, each of which is formed of at least three axisymmetric parts with a gap between them, constituting not less than 0.01 of the diameter of its Central hole. When this part of the conical liner United annular elastic element and the inner surface of the tapered bushing is made with threaded along their entire height. 3 Il. The invention relates to construction and is intended for the manufacture of prestressed concrete structures.A device for tensioning pageboy valve, including a focus, clamps and the power cylinder, in which the emphasis is made in the form of guides, in which is mounted the grip, and the other grip is installed on the piston rod of the power cylinder. (see ed.mon. USSR N 444868, class E 04 G 21/12, 1974, prototype).The main disadvantage of etcnot device when working with multi-span structures.The closest to the essential features is a device for tensioning pageboy valve (SN, patent, 534786, E 04 5/12, 1973), including the cylinder with the rod and grip pageboy valve, an additional hydraulic cylinder located at the front of the device executed with the opportunity to interact with the element pressing the valve and provided with a conical liners formed three axisymmetric parts with a gap between them.The technical result achieved by the invention is the creation of a design that allows the use of hydraulic jacks with great speed, which improves their performance when working with multi-span structures.This technical result is achieved by a device for tensioning pageboy valve comprising a hydraulic cylinder with piston and capture pageboy valve, and the capture is made in the form of a clip having a conical hole in contact with the tapered holes liners, placed in them pageboy valves, and each liner has an annular groove on the outer surface and formed of at least three axisymmetric parts with a gap between them, oberezoonry in its front part, and a piston fitting tapered bushing in the housing located at the front of the device.This will allow post-tensioning reinforcement beam to produce his pressing and thereby locking the beam to the desired force. The inner surface of the base of conical inserts are supplied resistant thread, located along the entire height of the insert, the clearance between adjacent surfaces of the conical liner not less than 0.01 of the diameter of its Central hole.In Fig. 1 shows a section of the device for tensioning pageboy valve; Fig. 2 cut conical element; Fig. 3 a top view of the conical element.Device for tensioning pageboy valve consists of a cylinder 1, piston 2, the anchor clips 3 in the front and rear parts of the device, a three-collet clamp 4, element fitting collets 5. Anchor ring 3 (Fig. 2 and 3) has a conical liners 6, consisting of three axisymmetric elements having between them a gap 7. The liner 6 has an annular groove 8 and the United annular elastic element 9.The device is also equipped with an additional hydraulic cylinder 10 located at the front of the device, and the piston C is t holes 12, through which pass the strands of the reinforcement 13.The device operates as follows.Before installing the tensioning pageboy valve pre-set anchor clip 3 at the front of the device at the end of the beam. Through holes 12 of the holder 3 is passed, the reinforcing strands 13 and inserted into a three-collet clamp around 4 strands 13 in the taper hole 12. Next, using the winch down device for tensioning the cage 3. The ends of the reinforcing strands 13 threaded into the channels of the cylinder and then into the holes 12 of the anchor clip 3 located in the piston 2 of the cylinder 1 at the tail end of the device, and insert the clips around 4 strands 13 with little effort. Device for tension should be tight and without distortions to lean on a wall, a beam or yoke. All cylinders are in their original positions. Device using the quick-release valve connected to the hydraulic system includes a pump, which, taking the working fluid from the tank, pressurize the working fluid in the hydraulic system. The piston 2 is in its extended condition. In the cavity of the cylinder 1 is the working fluid. The piston 2 moving, pull the strands 13, and then starts dopolnitelnye 14 on the inner surface of the conical bearing inserts cut into the reinforcing strands 13 and fixes them in the holder 3. The time required for fixation, is about 10 s after reaching the pressure of the working fluid of about 45 MPa.The return stroke of the cylinder 1 is provided by the flow of working fluid into the cavity of the stem. The piston 2 is returned to its original position. When this occurs Samarasinghe clip 3 in the rear of the device.The device is removed from the beam reinforcing strands and mounted on the new workplace.The proposed device has high reliability, adaptability in production work on the tension reinforcement beams and requires less time, which ensures high efficiency of its application. Device for tensioning pageboy valve comprising a cylinder with the rod and grip pageboy valve, characterized in that it is equipped with an additional hydraulic cylinder located at the front of the device with the possibility of its interaction with the element inject valve, and the capture is made in the form of a clip having a conical hole in contact with the tapered holes liners placed in them pageboy valves, and each liner has an annular groove on the outer surface and formed on the end is emenim in the groove, and the inner surface of the base of conical inserts are supplied resistant thread, located along the entire height of the insert, the clearance between adjacent surfaces of the conical liner not less than 0.01 of the diameter of its Central hole.
SUBSTANCE: proposal is related to construction and repair of artificial structures, mostly bridges, namely to devices and accessories for production of works related to concreting of construction structures and facilities. Anchor device includes support-anchor plate that contains casing arranged with conical channel and protrusion with support surface rigidly fixed to the casing, collet element installed in conical bore of support-anchor plate and reinforcement spiral that interacts with support surface of support-anchor plate. Support surface of protrusion is installed in the plane that is located perpendicularly to longitudinal axis of casing conical channel at the distance H equal to 0.6-0.7 of conical channel length from the plane of its largest diameter, at that between casing and support surface of protrusion there is radial surface arranged with radius R equal to 0.2 - 0.35 of conical channel length.
EFFECT: reduction of structure material intensity and labour intensity of its manufacture with simultaneous reduction of stress concentration in concrete.
5 dwg, 2 tbl