CN2474625Y

CN2474625Y - Expansion self binding prestressed reinforced concrete construction member

Info

Publication number: CN2474625Y
Application number: CN 01235015
Authority: CN
Inventors: 邱则有
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-30
Filing date: 2001-04-30
Publication date: 2002-01-30
Anticipated expiration: 2011-04-30

Abstract

The utility model relates to an expansion self-binding prestressed reinforced concrete element, and the prestressed reinforcement comprises reinforced concrete, a pendant, a steel strand, and an outer casing. The characteristic of the utility model is that self-binding slurry which contains expansion component with expansibility during solidification is filled between the steel strand and the outer casing. The utility model is characterized in that the prestressed reinforcement is fixedly bonded with concrete, which is of high binding strength without stress relaxation. The utility model can effectively improve the prestress intensity of the prestressed reinforcement, which brings the property of the prestressed reinforced concrete into play more thoroughly, and which increases the safety of the prestressed reinforced concrete. Moreover, the utility model directly employs a post-tensioned method to construct without performing pore passages, which is short in construction cycle, excellent in economic property and convenient and applicable in operation.

Description

Expensive self-binding prestressed reinforcement-concrete member

The utility model relates to a kind of concrete member that contains prestressed reinforcement, particularly includes the improvement of bonded prestress reinforced concrete member with well.

The ZL94208707.0 utility model patent discloses a kind of delayed bonding prestressed tendon concrete member, its design feature is that described retarding mortar is by cement, sand, retarding agent and pulverulent filler water are in harmonious proportion and form, comprise the concrete part, be equipped with some plain barss and prestressed reinforcement in the middle of the concrete, the two ends of every prestressed reinforcement have can apply prestressed anchor head, cladding has certain thickness retarding mortar layer around the cylindrical of every or some of them prestressed reinforcement, and also has the fluid-tight multiple film environmental sealing of one deck in the outside of retarding mortar layer, this utility model, because the retarding mortar in the multiple film of fluid-tight sealing and its outer asynchronous solidifying of concrete, concrete, mortar has blockage effect in process of setting, the internal layer mortar combines not tight with outer concrete, steel strand prestressing transmission effect is poor, stress relaxation is applied thereby influence it.

The purpose of this utility model is the deficiency that overcomes above-mentioned technology, provides a kind of presstressed reinforcing steel and concrete of making to bond firmly, bonding closely, can with prestressing force effectively, safety, reliable delivery is to the Expensive self-binding prestressed reinforcement-concrete member and the job practices thereof of concrete.

Expensive self-binding prestressed reinforcement-concrete member of the present utility model comprises steel bar concrete, anchor head, steel strand, outer wrap, be characterized in steel strand and outside be filled with it between the wrap and contain the self-adhesive slurry that has expansile expansion component in the solidification process.Described self-adhesive slurry can be made up of organic matter or inorganic matter etc., also can contain filler or aggregate.In the slurry condensation cure process, expansion component produces the suitable bulbs of pressure, and steel strand are closely bonded by outer coating sheath and concrete, transmits prestressing; The outer wrap of described Expensive self-binding prestressed reinforcement can be metal or plastics or coating or other coating, can be plastic film capicitor or metal threaded pipe or metal sleeve or plastic bushing.

Expansion component can be the compound expansion agent of inorganic expansion agent or organic expander or organic-inorganic, the polymerisation swollen resin, and as alum class expansion agent, UEA expansion agent, CP blowing agent, volution ortho acid lipid resin.

The most significant advantage of the utility model is that presstressed reinforcing steel and concrete bond firmly, and the adhesion strength height is unstressed lax.It is fully reliable, firm that thereby prestressing force passes to concrete, can effectively improve the prestress strength of presstressed reinforcing steel, brings into play the performance of prestressed reinforced concrete more fully, the safety that improves prestress concrete.Secondly, need not reserving hole channel and directly adopt post-tensioned construction, short construction period, economic performance is good, easy to operate being suitable for.

Below in conjunction with drawings and Examples the utility model is further set forth.

Fig. 1 is the longitudinal section of the utility model embodiment.

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

Shown in Fig. 1～2, the utility model comprises steel bar concrete 1, anchor head 2, steel strand 3, outer wrap 4, it is characterized in that steel strand and outside be filled with it between the wrap and contain in the solidification process and have

The self-adhesive slurry 5 of expansile expansion component.Outer wrap 4 can be metal or plastics or coating or other coating, as plastic bushing, plastic film capicitor, metal sleeve, metal threaded pipe etc.

Provide the embodiment that self-adhesive slurry 5 is made in the utility model below, embodiment 1: the self-adhesive wet end furnish is portland cement 10%-95%, alumina cement 2-20%, gypsum 2-17%, retarding agent 0.1-8%, borax 0.1-3.5%, polyvinyl alcohol glue 0.1-2%, sodium potassium tartrate tetrahydrate 0.1-5.2%, adds suitable quantity of water and forms through mixing stirring and processing.In this embodiment portland cement, alum scholar cement, the common grinding of gypsum or respectively grinding mix, add retarding agent, borax, sodium potassium tartrate tetrahydrate, polyvinyl alcohol glue etc. simultaneously.Alum scholar cement, portland cement under the effect of retarding agent, hydration and hardening not substantially in early days, behind the certain hour, aluminate in the alum scholar cement and gypsum are met the synthetic crystalline entringite of aquation; C in the portland cement ₃A, or C ₃S, C ₂When S and f-CaO aquation, the Ca that separates out (OH) ₂Also form the entringite reaction, volume expansion when entringite generates.Usually alum scholar cement and gypsum are called expansion component, portland cement is main intensity component.Aluminate content is big more, and issuable swell increment and speed of expansion are high more.

Embodiment 2: it is an amount of that the self-adhesive wet end furnish is that epoxy resin 10-70%, acrylonitrile-butadiene rubber 0.1-30%, azodiisobutyronitrile 0.1-12%, maleic acid 0.1-3.5%, Celogen Az 0.001-1%, three change boron complex 0.1-3%, French chalk 5-30%, magnetic 0.1-5%, CP blowing agent.In the present embodiment, the epoxy resin of viscous liquid is because the active epoxy radicals that responds, and boron trifluoride complex (as: boron triflouride-mono aminoethane) at room temperature is stable with after epoxy resin mixes, and does not react with epoxy resin.Under higher temperature, complex compound decomposes automatically, very fast cured epoxy resin, and under higher temperature, the CP foamed expander expands, and expanded resin compound makes presstressed reinforcing steel combine firmly with sheath and concrete.Its acrylonitrile-butadiene rubber is a modifier.

Embodiment 3: the self-adhesive formula of size is than being polyethers polyurethane 50%-90%, DOP plasticizing agent 0.1-5%, CaCo ₃8%-50%, DTP class expansion agent are an amount of.

The preparation method of Expensive self-binding prestressed reinforcement of the present utility model is 1), modulation self-adhesive slurry; 2), with above-mentioned self-adhesive slurry coated steel twisted wire periphery; 3), outer wrap is coated the self-adhesive slurry; 4), the Expensive self-binding prestressed reinforcement that will do above-mentioned processing places mould and with the plain bars colligation; 5), pour concrete, and install the anchor head at prestressed reinforcement two ends; 6), when concrete setting and hardening (for example 8 days) when the design strength, utilize the stretch-draw instrument that anchor head is applied tension force to design load, remove the stretch-draw instrument.

In the above-mentioned work progress, the self-adhesive slurry serves as lubricant medium in sheath, steel strand slidably, do not bond between steel strand and the concrete in sheath, at this moment tensioned prestressing bar, presstressed reinforcing steel by ground tackle with Stress Transfer to the concrete member, subsequently, the self-adhesive slurry solidifies voluntarily, also can make the self-adhesive slurry curing by auxiliary processes such as heating or magnetic field or ray or microwaves, the condensation cure process produces and expands, and makes the special-shaped position and the interior road of sheath in road, particularly steel strand in the whole sheath of slurry turgor.When hardening mid-term, slurry contraction effect when producing certain expansion with compensation curing (sclerosis), later stage makes presstressed reinforcing steel and concrete produce adhesion stress and microdilatancy pressure, and concrete and presstressed reinforcing steel closely bond, and form the bonded prestressed tendon concrete member that is in the milk and afterwards solidifies earlier.

Claims

1, a kind of Expensive self-binding prestressed reinforcement-concrete member comprises steel bar concrete, anchor head, steel strand, outer wrap, it is characterized in that steel strand and outside be filled with it between the wrap and contain the self-adhesive slurry that has expansile expansion component in the solidification process.

2,, it is characterized in that outer wrap can be metal or plastics or coating or other coating according to the described Expensive self-binding prestressed reinforcement-concrete member of claim 1.

3,, it is characterized in that described outer wrap can be plastic film capicitor or metal threaded pipe or metal sleeve or plastic bushing according to the described Expensive self-binding prestressed reinforcement-concrete member of claim 2.

4, according to the described Expensive self-binding prestressed reinforcement-concrete member of claim 1, the prescription that it is characterized in that described self-adhesive slurry is portland cement 10%-95%, alumina cement 2-20%, gypsum 2-17%, retarding agent 0.1-8%, borax 0.1-3.5%, polyvinyl alcohol glue 0.1-2%, sodium potassium tartrate tetrahydrate 0.1-5.2%, adds suitable quantity of water and forms through mixing stirring and processing.

5, according to the described Expensive self-binding prestressed reinforcement-concrete member of claim 1, the prescription that it is characterized in that described self-adhesive slurry is that epoxy resin 10-70%, acrylonitrile-butadiene rubber 0.1-30%, azodiisobutyronitrile 0.1-12%, maleic acid 0.1-3.5%, Celogen Az 0.001-1%, boron trifluoride complex 0.1-3%, French chalk 5-30%, magnetic 0.1-5%, CP blowing agent are an amount of.

6, according to the described Expensive self-binding prestressed reinforcement-concrete member of claim 1, the prescription that it is characterized in that described self-adhesive slurry is polyethers polyurethane 50%-90%, DOP plasticizing agent 0.1-5%, CaCo ₃8%-50%, DTP class expansion agent are an amount of.