CN1067284A - Treatment method for preventing leakage of concrete reinfored by jetted short glass fibre - Google Patents

Abstract

A kind of method of water transfer facility being carried out the antiseepage processing, present technique is to utilize the characteristics of concrete reinfored by jetted short glass fibre (being called for short GRC) moulding arbitrariness, along fried rough cliff crack, Shiqu road or the thick GRC impervious barrier of the about 10mm of other water transfer facility jet surface one decks, the thin wall construction that formation rises and falls with rock mass or wall, crack on rock or the wall is all sealed, stop up penetrating passage, reached the purpose that antiseepage is stopped up.It handles stone drieding canal immersioning cranny with simple process, not only economical, effectively, the construction period but also short, be a kind of practicality and invest little anti-seepage processing method.Present technique can be used for antiseepage, the repairing of water transfer facility such as stone-laying canal, steel screen thin shell slot and force pipe external protection and handles.

Description

Treatment method for preventing leakage of concrete reinfored by jetted short glass fibre

The invention belongs to water conservancy and hydropower water transfer facility seepage control processing construction technique field, present technique can be used for antiseepage, the repairing of multiple water transfer facility to be handled, and its particularly suitable is opened the processing of stone drieding canal immersioning cranny.

Glass fiber reinforced cement concrete (Glass Fibre Reinforced Cement ﹠amp; Concrete is called for short GRC) this constructional materials be this century the fifties end propose by the Soviet Union, through various countries experts and scholars' effort for many years, after having solved the alkaline-resisting problem of glass, be applied to aspects such as the room is built, bridge, road, civilian sanitary fittings morely.According to relevant bibliographical information, the liner plate of GRC sheet material as the irrigation and water conservancy canal for water conveyance once made by indivedual countries in factory.The present GRC of China is mainly used in aspects such as inside and outside wall board, roof panel, balcony barrier and bathtub, the biomass pool of building construction.According to investigation, a large amount of water transfer facility is irregular section canal bed in China's Hydraulic and Hydro-Power Engineering, and it is uneven particularly to blast Shiqu canal bed surface rock mass, and the crack is crisscross, can't lining cutting typing liner plate.Domestic at present to the seepage treatment of fried Shiqu comparatively adequate solution method of neither one also, great majority are not handled, and let alone seepage, have wasted great amount of water resources.Also have indivedual engineerings to adopt the large volume pouring concrete, but this methods engineering amount is big, long in time limit, the existing national economy situation of construction investment and China is incompatible, is difficult to large tracts of land and uses.In order to solve fried Shiqu leakage problems simply, effectively, we were subjected to the trust of Fujian provincial scientific and technological commission and hydraulic power chamber in 1987, begun the application study work of present technique, through Fujian Province's Office for Scientific and Technical Information and the retrieval of water conservancy and hydropower Scientific And Technical Intelligence Center station, Fujian Province, all do not find documents and materials relevant and achievement (seeing Appendix 1,2,3) recently with this technology.

The purpose of present technique is to use less investment, the construction technology that simple, general constructor is easy to grasp, and the method that helps applying solves the crack seepage of fried Shiqu and the impervious repairing problem of other water transfer facility.

The solution of present technique is to utilize the characteristics of concrete reinfored by jetted short glass fibre moulding arbitrariness, need work of treatment face along fried Shiqu rough cliff crack or other facilities sprays the thick GRC impervious barrier of the about 10mm of one deck, the thin wall construction that formation rises and falls with treated side, crack on the rock is all sealed, stop up penetrating passage, thereby play the purpose of impervious leakage-stopping.

The principle and the method for present technique are: the glass fiber among the GRC with minute diameter, small section be disorderly to or directed being uniformly clouded in the cement matrix, can bear and disperse the concentrated stress at matrix fine cracks place, play the effect that stops and slow down the crack development, make the GRC material have whole cracking resistance, eliminate the ordinary mortar weakness of be full of cracks easily, thereby obtained good anti-permeability performance.Simultaneously, adopt have an alkali resistant ability contain the zirconium low alkali glass fiber, make GRC have certain durability.Because the glass fiber diameter among the GRC is 13～14 μ m only, be easy to GRC and form thin wall construction, when glass fiber is the short fiber reinforcement, make GRC not influencing substantially under the situation of canal for water conveyance cross dimensions, form the impervious barrier of arbitrary shape along rough surface.The crack of rock mass and the position of some serious depressions are then filled with the matrix cement mortar, make it to fuse with the GRC impervious barrier, form the chock 2 that differs in size one by one and be bolted at (Fig. 1) on the cliff, make GRC watertight facing difficult drop-off, weaken with the adhesion stress that the rock mass bonding surface causes because of material property is different to compensate for watertight facing.In GRC, add an amount of water reducing agent, can reduce water/binder ratio, improve the plasticity of mixing and stirring material, after concrete condenses, can also stop up pore in the concrete, increase the caking property of GRC and matrix material, improve every physical and mechanical property of GRC, improve the impervious ability of GRC material.The key of present technique is that preparation can be satisfied anti-seepage of channels requirement, glass fiber reinforced cement concrete with good physical mechanical property, by selection and control to raw material and proportioning, guarantee compactness, crack resistance and the durability of GRC, formulate corresponding construction technology program and system according to its execution conditions again.

Present technique is compared with existing channel seepage technique, have applied widely, construction period short, construction technology is simple, the raw material consumption is few, do not reduce canal cross section size, economic benefit advantages of higher, especially for fried Shiqu road, have more significant superiority.It is compared with Cast-in-place concrete, handles the Cast-in-place concrete thickness average out to 15-20cm that explodes Shiqu road seepage with Cast-in-place concrete, and when guaranteeing the canal cross section size, every square metre of canal wall need increase excavation cubic meter of stone amount 0.15-0.2m ³, the wide every 100m of channel of the high 5m of 5m must increase excavation cubic meter of stone amount 225-300m ³More than.Simultaneously, must formwork erection, build, vibrate, maintenance, form removal, its construction period is long, pour concrete behind the formwork erection is if poured into a mould 80-100m in one day ², getting maintenance form removal again after 7 days after the cast, programming can not be carried out continuously, and construction investment is big, every m ²Cost is more than 30 yuan, and material usage is big, every 100m ²The concrete consumption reaches 150-200m ³Adopt and spray the GRC processing, on average everyone one class (8 hours) can handle 10-15m ², 11 people construction corpss that comprise the mechanician can handle more than 100 square metre in one day, can continuously construct the every 100m of raw materials consumption amount ²About 1-2m ³, only be one of percentage of Cast-in-place concrete, every m ²Cost is about about 15 yuan, only be pour concrete half less than, and can save time again without formwork erection.

The explanation of accompanying drawing drawing:

Fig. 1 sprays GRC schematic diagram is handled in the antiseepage of fried Shiqu crack, and numbering 1 is the cement paste chock of fried Shiqu rock mass 2 for pouring in the fried Shiqu crack among the figure; 3 is the GRC watertight facing; 4 is the mortar spray gun; 5 is the glass fiber cutting machine

Fig. 2 construction equipment schematic diagram, figure numbering 4 is the mortar spray gun; 5 is the glass fiber cutting machine; 6 is mortar mixer; 7 is vibrosieve; 8 is mortar pump; 9 is air compressor; 10 is non-twist fibre glass roving

Fig. 3 embodiment canal cross section schematic diagram, b=4500mm among the figure; H=3500mm

Use on the fried Shiqu road that the right trunk canal of certain large reservoir head works portion is 100 meters long and spray GRC and carry out crack seepage treatment method and can be used as embodiments of the invention: the canal cross section size of handling and section situation schematic diagram see accompanying drawing 3.Handle used GRC material mix proportion such as following table:

Cement mortar mix ratio					Glass fiber volume %
						Cement	Water	Sand	Plasticizing agent	Water reducing agent
100	34～40	50～150	In right amount	In right amount							2～3

Construction technology (Fig. 2) step is as follows: remove foreign material such as the dust blast on the cliff, moss, grass roots 1.; 2. press respectively each raw material of weighing of cement mortar mix ratio, and be put in and stir in the mixer 6 that to make the GRC mortar matrix standby; 3. by mortar pump 8 cement mortar is delivered to mortar spray gun 4, to serious depression position and the full mortar matrix of crack spray earlier that blasts cliff; 4. adjust mortar emitted dose and jet velocity and make it atomizing, simultaneously the roving alkali resistant glass fiber is cut into the fiber ejection of 3～5cm length via glass fiber cutting spraying machine 5, adjust its emitted dose and make it and spray mortar to mate, satisfy the requirement of glass fiber volume; 5. mortar is aloft evenly mixed with glass fiber, be injected on the scope of operation simultaneously.For guaranteeing GRC impervious barrier quality, the distance of the spray gun and the scope of operation should be controlled at about 30cm, to keep spraying skyborne mixing uniformity of thing and injection dynamics; 6. spray GRC reach 10mm thick after, the troweling of manually having a shave.7. moisture-keeping maintaining is 3～7 days.

This project coprocessing 250m channel, moved 2 years all right, stopped a large amount of infiltration situations, can be this reservoir 96.4 ten thousand m that economize on water every year ³, it handles the gross area is 1065m ², expensive 15,975 yuan, this technology is successful, has good economic benefit and social benefit.

Claims (2)

1, a kind of seepage control processing construction technique of water transfer facility, it is characterized in that along the thick short glass fiber refinforced cement concrete of the about 10mm of water transfer facility jet surface one deck (being called for short GRC) impervious barrier, the thin wall construction that formation rises and falls with the object being treated surface, the crack is all sealed, stopped up penetrating passage, the processing of the bonding problem on GRC impervious barrier and processed surface is to utilize the matrix material---cement mortar of filling with GRC at processed crack and recess when considering the adhesion performance of material own, makes it to become the wedge post processed the means that tie together with watertight facing are guaranteed.

2, the match ratio according to the short glass fiber refinforced cement concrete described in the claim 1 is: when getting 100 parts of cement, sand is used 34-40 part, and water is used 50-150 part, and plasticizing agent and water reducing agent are an amount of, and alkali resistant glass fiber is got the 2-3% of GRC total amount.

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