CN1027516C

CN1027516C - Prepressed anchor fixing device with steel tube

Info

Publication number: CN1027516C
Application number: CN 90102933
Authority: CN
Inventors: 袁国干
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 1990-09-14
Filing date: 1990-09-14
Publication date: 1995-01-25
Anticipated expiration: 2005-09-14
Also published as: CN1059953A

Abstract

The present invention relates to a prepressed anchor fixing device with a steel tube, which is device creating prestress in a concrete structure, and a pressed zone of the structure generates tensile stress used for counteracting partial load which is mainly compressive stress of dead load; thereby, the bearing capacity of the structure is improved, or the sectional dimension is reduced. The present invention has the characteristics that no friction resistance is generated, and no friction resistance loss exists; steel bars are matched according to a bending monent internal force envelope diagram, and steel can be saved. The present invention is composed of a stressing component and a pressure bearing component, wherein the stressing component comprises a steel bar and a rolling wire anchor device and can be recovered for repeated use; the pressure bearing component comprises a seamless steel tube and an anchoring steel plate. The present invention can be applied to prestressed concrete and a reinforced concrete structure.

Description

Prepressed anchor fixing device with steel tube

The invention belongs to a kind of device that produces the concrete pre-tensile stress, be used for the steel concrete and the prestressed reinforced concrete construction of civil engineering, can improve structural-load-carrying capacity or reduce depth of beam.Also can be used for the reinforcing of steel concrete and prestressed reinforced concrete construction.

Existing H Rui Fensi is " back platen press bar reinforcement is pressed anchor system " of your (HReiffenstuhl) professor invention on foot, be that special steel sleeve is set in the pressure zone of prestressed concrete beam, after treating that concrete setting reaches design strength, after with special jack high-tensile steelo bars being compressed in special sleeve pipe, be fixed on the end of beam again with special ground tackle, by means of the elastic restoring force of reinforcing bar, make the concrete of pressure zone produce tensile stress.Another kind of device is DT-2342049 " building unit of variable pre-applied force-plug pretension, a sleeve pipe precharge pressure ".The major defect of these two kinds of systems is:

1, crude steel rod or bar reinforcement all will produce very big frictional resistance after being pressed into steel sleeve, and loss of prestress is very big, can not effectively utilize steel strength and use steel more;

2, all bar reinforcements all belong to expendable material with sleeve pipe and can not reclaim, and its Zhong Ruishi pressure anchor system must be arranged into the beam-ends of both sides along the beam total length, can not be by moment of flexure envelope diagram of internal force arrangement of reinforcement, and steel using amount is very big;

3, must adopt special jack, steel sleeve, ground tackle and relevant special-purpose ancillary service, construction equipment cost height;

4, construction trouble, operation is many, and progress is slow, and is long in time limit;

5, DT-2342049 only is applicable to steel work.

The objective of the invention is to design a kind of prepressed anchor fixing device with steel tube.This device can make the concrete of the pressure zone of flexural member (beam) in steel concrete and the prestressed reinforced concrete construction and compression-member (post) produce tensile stress, in order to offset fractional load stress, mainly be the compressive stress of dead load, thereby improve the supporting capacity in cross section or reduce sectional dimension.For spandrel girder, can make the very little Very Low Clearance beam of building height, can save construction investment, also can be used for concrete structure reinforcement economically, effectively.Therefore, the present invention has bigger economic benefit.

Design scheme of the present invention is made up of afterburning parts and pressure-containing member.Afterburning parts, comprising high-tensile steelo bars and rolling a ground tackle is packing ring and anchoring nut; Pressure-containing member comprises high-strength seamless steel pipe and anchor plate.Afterburning parts are the instrument device, recyclable repeated use, and pressure-containing member is structural device, is used to set up concrete tensile stress, perpetuity is within structure.

Advantage of the present invention is:

1, do not produce frictional resistance, no frictional resistance loss can utilize steel efficiently;

2, can save steel by moment of flexure envelope diagram of internal force arrangement of reinforcement;

3, need not adopt special construction machinery equipment and special ground tackle and sleeve pipe etc., as long as adopt jack commonly used in the common prestressed reinforced concrete construction, roll a ground tackle and bar reinforcement, can set up compressive pre-stress to steel pipe, after discharging the steel pipe compressive stress, can set up the prestressed concrete structure;

4, construction technology is simple, and speed is fast, and the duration is short;

5, press anchor system all can industrialization, batch production, batch process, also can make installation on the spot, bar reinforcement with roll that a ground tackle is recyclable to be repeated turnover and use, reduce cost.

Be described further in conjunction with the accompanying drawings.

Fig. 1 is a fundamental diagram;

Fig. 1-1 is concrete stress figure on the beam section; No. one is tensile stress, and No. ten is compressive stress.

Dispose the preload tube of prepressed method anchor fixing device of the present invention at the pressure zone upper limb of beam, the precompression of steel pipe is discharged the back with regard to pair cross-section generation tensile stress, after the prestressing combination of common prestressed concrete, selfweight stress can be offset be zero, i.e. zero stress state.Make the flexural strength on the cross section be used to bear life-load stress fully, thereby improved structure bearing capacity, make depth of beam can be reduced to common prestressed concrete the minimum constructive height that can't design, satisfying the requirement of particular design, and can save construction investment.

Fig. 2 is a constructional drawing.

Fig. 2-1 is the A-A sectional drawing.

Structure design of the present invention is made up of afterburning parts and pressure-containing member two parts.Afterburning parts comprise high-tensile steelo bars 2 and roll a ground tackle, i.e. packing ring 4 and anchoring nut 5; Pressure-containing member comprises high-strength seamless steel pipe 1 and anchor plate 3.Afterburning parts are the instrument device, recyclable repeated use; Pressure-containing member is structural device, is used to set up concrete tensile stress, and perpetuity is within structure.Its connecting mode is: screw thread is processed at the two ends of high-tensile steelo bars 2, high-tensile steelo bars 2 penetrate in the high-strength seamless steel pipe 1, put the square anchor plate 3 that has the hole then at the two ends of high-tensile steelo bars 2, install again that to roll a ground tackle be packing ring 4 and anchoring nut 5, the welding of one end or the heading of indented bars 6 are anchored on the anchor plate 3, the other end is in free state, bury during use and build in concrete, its radical and length all are provided with indented bars 6 equally by the designing requirement decision on the anchor plate 3 at two ends.

Fig. 3 sets up the process chart of concrete pre-tensile stress embodiment for the present invention.

The present invention sets up concrete pre-tensile stress processing step: at first the threaded high-tensile steelo bars 2 in two ends are penetrated in the high-strength seamless steel pipe 1, put the square anchor plate 3 that has hole then at the two ends of high-tensile steelo bars 2, it is packing ring 4 and anchoring nut 5 that a ground tackle is rolled in installation, the welding of one end or the heading of indented bars 6 are anchored on the anchor plate 3, and the other end freely buries and builds in concrete.With YC-60 type jack tension high-tensile steelo bars 2, counter-force makes high-strength seamless steel pipe 1 be subjected to compressive pre-stress by anchor plate 3, after stretch-draw high-tensile steelo bars 2 reach builder's tonnage, tightens anchoring nut 5, so just finished prepressed anchor fixing device with steel tube.When in engineering structures, using, at first anchor fixing device is installed in the design position in the template, after treating that concrete reaches design strength, unscrew anchoring nut 5, discharge the pulling force in the high-tensile steelo bars 2, high-strength seamless steel pipe 1 discharges its pressure that bears (concrete is produced tensile stress) promptly because of the elasticity resilience of its material, and be delivered in the beam body by high-strength seamless steel pipe 1 and concrete contact surface and indented bars 6, make concrete obtain pre-tensile stress (Fig. 3).High-strength seamless steel pipe 1 available light face seamless steel pipe, external screw thread face seamless steel pipe, odd-shaped cross section seamless steel pipe, light face add welding shearing resistance device seamless steel pipe etc.; Afterburning reinforcing bar can be used high-tensile steelo bars, steel tendon and steel strand and corresponding ground tackle.

The present invention not only can satisfy the particular design requirement, and for example the prestressed reinforced concrete construction of Very Low Clearance beam, the hypodynamic beam of reinforcing carrying etc. also can be applicable in the ordinary reinforced concrete structure, can save construction investment equally.

Claims

1, a kind of prepressed anchor fixing device with steel tube, comprise steel pipe, reinforcing bar and roll a ground tackle, it is characterized in that: in prestressed concrete and reinforced concrete structure upper limb pressure zone, before concrete setting, steel pipe is compressed earlier, high strength cast iron (2) and roll a ground tackle, promptly packing ring (4) and anchoring nut (5) they are the detachable tool device, recyclable repeated use; Having on the square anchor plate (3) in hole, welding or heading anchoring indented bars (6), the other end of indented bars (6) is a free state, two anchor plates (3) are pressed on the two ends of seamless steel pipe (1) with opposite direction.

2, prepressed anchor fixing device with steel tube according to claim 1, it is characterized in that: the end welding or the heading of indented bars (6) are anchored on the anchor plate (3), be arranged in along the periphery of seamless steel pipe (1), promptly evenly arrange go to produce tensile stress in the concrete so that the compressive pre-stress that seamless steel pipe (1) discharges is delivered to along the concentrically ringed circumference of seamless steel pipe (1).