CN201052650Y - Retardation setting tendon plastic sheath coating frame head - Google Patents

Abstract

The utility model relates to a coating device of plastic protective sleeves for retarding prestressed reinforcements. Devices for packing plastic protective sleeves in the prior art can cause the phenomena of bubble, break and leakage to plastic coatings. The plastic packing head of the utility model comprises a mold body and a mold cover, wherein the center of the mold body is provided with a barrel-type finish mold. The mold cover is fixedly provided with a standard sleeve barrel, and one end of the standard sleeve barrel passes into the finish mold. The side wall of the mold body is provided with a circular melting plastic charging tank which is closed via the mold cover. The melting plastic charging tank is communicated with the finish mold and a melting plastic inlet, and is provided with a cooling sleeve at the position corresponding to the finish mold. The utility model ensures even coating of plastic melding element and fast cooling and fixation of the external surface of the plastic protective sleeve on the internal surface of the cooling sleeve, and realizes that prestressed reinforcements for concrete are coated with a layer of retarded mortar and a plastic protective sleeve for sealing the mortar.

Description

Slow-condensing prestressed reinforcing bar plastic protecting shelter coats head

Technical field

The utility model relates to a kind of plastic shaping device, relates in particular to the coating unit of the plastic sheath that is used for slow-condensing prestressed reinforcing.

Background technology

In prestressed concrete technology,, traditionally the prestress method is divided into pre-tensioning system and post stretching according to the priority of deformed bar stretch-draw time.Post stretching is divided into the nothing bonding again and two kinds of prestress systems of bonding is arranged according to the difference of construction technology.Not having bonding is to coat to wrap up in plastics outside the grease on reinforcing bar; Have the bonding be reserving hole channel in concrete component, penetrate reinforced bar stretching after, grout injection in the duct.Post stretching does not have the fatigue that bonding easily causes reinforcing bar and ground tackle, has bonding to require reserving hole channel, presses complicated processes such as hole grouting.If nothing bonding and bonded prestress system in the post stretching are combined, form retarded adhesive prestressed system, i.e. reserving hole channel not, must not press hole grouting, the same with no bonding system during construction, reinforcing bar is directly imbedded concrete, and after construction is finished, by be wrapped on the deformed bar retarding mortar in time prolongation and setting and harden gradually reach and bonded prestress system same effect.Adopting slow-condensing prestressed reinforcing is that nothing bonding and bonded prestress system in the post stretching are combined, and forms slow bonding system.Slow-condensing prestressed reinforcing is exactly at a kind of special retarding mortar of reinforcing bar outer wrapping, and this mortar requires under 5-40 ℃ of airtight condition, can be noncondensing before 30 days, and this has just satisfied the time requirement of on-the-spot stretching force muscle.Simultaneously be wrapped with plastic sheath, retarding mortar and concrete are isolated at retarding mortar.Slow-condensing prestressed reinforcing is directly imbedded concrete during construction, after treating that concrete reaches requirement of strength, stretch-draw slow-condensing prestressed reinforcing and anchoring, be wrapped in this moment on the slow-condensing prestressed reinforcing retarding mortar in time prolongation and setting and harden gradually reaches the effect identical with the bonded prestress system.So just, simplified construction technology, the back of retarding mortar sclerosis simultaneously produces the effect that bonds to reinforcing bar, solves the fatigue of unbonded prestressing tendon and ground tackle, and it is more convenient, more extensive that prestressed concrete technology is used, market potential is bigger, and society that is brought and economic benefit are more remarkable.Slow-condensing prestressed reinforcing has the cloth rope freedom of unbonded tendon, easy to use, the setting that need not the duct and the advantage of mud jacking.Yet, how to be implemented in and to wrap up one deck retarding mortar and plastic sheath on the reinforcing bar for prestressed concrete continuously, be the key that retarded adhesive prestressed system obtains applying in actual engineering.(a kind of presstressed reinforcing steel coating unit and uses thereof, the patent No.: 03122799.6) disclose a kind of continuous coating unit automatically, wherein right-angle handpiece is the core component of parcel plastic sheath to disclosed patent.This right-angle handpiece can adopt similar cable to coat the structure of extrusion molding mould, but because the plastics of fusion are coated on the mortar through extruding, mortar surface moisture vaporization rapidly makes that plastic coatings bubbles, breaks, spillage, can not seal mortar.

Summary of the invention

The purpose of this utility model just provides a kind of coating head of slow-condensing prestressed reinforcing bar plastic protecting shelter, realizes being enclosed with the outer one deck plastic sheath that coats continuously of deformed bar of retarding mortar, forms the slow-condensing prestressed reinforcing goods.

Slow-condensing prestressed reinforcing bar plastic protecting shelter of the present utility model coats head and comprises die body and die cap, and the molten plastic inlet of die body is communicated with by adpting flange with plastic extruder.Die body and die cap are equipped with heating jacket outward, and the die body center has through hole, form cartridge type mouth mould.The corresponding mouthful mould in die cap center has through hole.Be fixed with the typing sleeve on the die cap, typing sleeve position cooperates with a mouthful mould, and the one end stretches in mouthful mould and is provided with, and the outer wall of typing sleeve and the space between mouthful mould are the plastic sheath shaping area.The molten plastic that corresponding mouthful of mould position of die body sidewall is provided with circular ring type injects groove, and molten plastic injects the opening surface of groove by the die cap capping, forms the molten plastic injection channel.Caving in the bottom, outer ring of molten plastic injection groove, forms the molten plastic buffering area.Molten plastic injects groove and communicates with a mouthful mould, and is communicated with the molten plastic inlet by the molten plastic passage.Corresponding mouthful of mould fixed-site has coolant jacket on the die body, and the interlayer of coolant jacket communicates with cooling circulating water, and the inner chamber of coolant jacket is communicated with a mouthful mould.

The utility model has guaranteed that plastic melt coats equably, and extrudes and do not produce melt run from whole mouthful mould cross section with identical Mean Speed, and barometric gradient increases evenly.The plastic sheath outer surface is attached to the coolant jacket inner surface, and rapidly cooling is fixing, and the coating plastic sheath is with the sealing mortar when being implemented on the reinforcing bar for prestressed concrete parcel one deck retarding mortar.

Description of drawings

Fig. 1 is the structural representation that slow-condensing prestressed reinforcing bar plastic protecting shelter coats head, among the figure: plastic extruder 1, adpting flange 2, die body 3, coolant jacket 4, heating jacket 5, die cap 6, molten plastic buffering area 7, mouthful mould 8, typing sleeve 9;

Fig. 2 is the structural representation of die body end face among Fig. 1, and among the figure: molten plastic path 10, molten plastic inject groove 11.

The specific embodiment

As illustrated in fig. 1 and 2, slow-condensing prestressed reinforcing bar plastic protecting shelter coats head and comprises die body 3 and die cap 6, and the molten plastic inlet of die body 3 is communicated with by adpting flange 2 with plastic extruder 1.Die body 3 and the die cap 6 outer heating jackets 5 that are equipped with.The die body center has through hole, forms cartridge type mouth mould 8.The corresponding mouthful mould 8 in die cap 6 centers has through hole.Be fixed with typing sleeve 9 on the die cap 6, typing sleeve 9 positions cooperate with a mouthful mould 8, and the one end stretches in mouthful mould 8 and is provided with, and the outer wall of typing sleeve 9 and the space between mouthful mould are the plastic sheath shaping area.The molten plastic that corresponding mouthful of mould 8 positions of die body 3 sidewalls are provided with circular ring type injects groove 11, and molten plastic injects the opening surface of groove 11 by die cap 6 cappings, forms the molten plastic injection channel.Caving in the bottom, outer ring of molten plastic injection groove 11, forms molten plastic buffering area 7.Molten plastic injects groove 11 and communicates with a mouthful mould 8, and is communicated with the molten plastic inlet by the molten plastic path 10.Corresponding mouthful of mould 8 fixed-site have coolant jacket 4 on the die body 3, and the interlayer of coolant jacket 4 communicates with cooling circulating water, and the inner chamber of coolant jacket is communicated with a mouthful mould 8.

In the work, reinforcing bar and retarding mortar are together sent in the typing sleeve 9.From the melt plastics of plastic extruder 1 with the molten state level pressure, quantitatively, constant temperature arrives die bodys 3 by adpting flange 2, and the molten plastic that enters on the die body 3 by the molten plastic path 10 between die body 3 and the die cap 6 injects groove 11.Runner annular space between typing sleeve 9 and mouthful mould 8 is extruded into tubulose, through coolant jacket 4 sizing shaping and coolings, is overmolding to plastic sheath outside retarding mortar.Heating jacket 5 has guaranteed that die body 3 and die cap 6 have certain temperature, thereby keeps molten plastic to inject the molten condition of groove 11 and molten plastic path 10 at molten plastic.The setting of molten plastic buffering area 7 has guaranteed cladding uniformity.

This kind structure has guaranteed that plastic melt coats equably, and extrudes and do not produce melt run from whole mouthful mould cross section with identical Mean Speed, and barometric gradient increases evenly.This be fill mortar in a kind of pipe, pipe adds the cooling and shaping cover, make the plastic sheath outer surface be attached to method that the coolant jacket inner surface cools off the fixed outer diameter size rapidly be implemented on the steel strand wires for prestressed concrete parcel one deck retarding mortar simultaneously the coating plastic sheath with the sealing mortar.The reinforcing bar that this structure will have been wrapped up retarding mortar dexterously non-caked, sclerosis by wherein the time, and on mortar, coat the plastics of one deck fusion and immediately through the cooling jacket typing, plastics bubble, breakage and the vaporization of unlikely mortar surface moisture makes.

Claims (1)

1. slow-condensing prestressed reinforcing bar plastic protecting shelter coats head, comprise die body and die cap, the molten plastic inlet of die body is communicated with by adpting flange with plastic extruder, die body and die cap are equipped with heating jacket outward, it is characterized in that the die body center has through hole, form cartridge type mouth mould, the corresponding mouthful mould in die cap center has through hole; Be fixed with the typing sleeve on the die cap, typing sleeve position cooperates with a mouthful mould, and the one end stretches in mouthful mould and is provided with, and the outer wall of typing sleeve and the space between mouthful mould are the plastic sheath shaping area; The molten plastic that corresponding mouthful of mould position of die body sidewall is provided with circular ring type injects groove, and molten plastic injects the opening surface of groove by the die cap capping, forms the molten plastic injection channel; Caving in the bottom, outer ring of molten plastic injection groove, forms the molten plastic buffering area; Molten plastic injects groove and communicates with a mouthful mould, and is communicated with the molten plastic inlet by the molten plastic passage; Corresponding mouthful of mould fixed-site has coolant jacket on the die body, and the interlayer of coolant jacket communicates with cooling circulating water, and the inner chamber of coolant jacket is communicated with a mouthful mould.

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