CN101824813B - Dam crack and aging resisting method based on coupled temperature and humidity - Google Patents
Dam crack and aging resisting method based on coupled temperature and humidity Download PDFInfo
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Abstract
The invention discloses a dam anti-crack and anti-aging method based on coupled temperature and moisture, including: covering a polyurethane rigid foam heat-insulating humid-holding impermeable layer on the dam surface, and spraying or covering a polyester mortar or a mortar protection layer on the polyurethane surface; covering a polyurethane+polyester mortar or mortar heat-insulating humid-holding impermeable layer on a plate surface of a rock-fill dam, and the thickness being 1cm-5cm; covering a polyurethane foam on a concrete surface of upstream and downstream surfaces of a gravity dam or bottom holes and surface holes of the dam, or re-covering the polyester mortar or mortar heat-insulating humid-holding impermeable layer on the polyurethane surface; the thickness of the polyurethane foam being 1cm-5cm, the mortar thickness being 0.5cm-5cm; on an arch dam, covering the polyurethane+polyester mortar or mortar heat-insulating humid-holding impermeable layer on the concrete dam upper stream and downstream surfaces, and the thickness being 1cm-5cm. The method of the invention has significant meaning for preventing the concrete from generating surface crack, and improving the load bearing performance, anti-eroding and anti-aging performances of the concrete.
Description
Technical field
The invention belongs to the hydraulic engineering technical field, particularly dam be incubated, preserve moisture, antiseepage, anticracking and anti-aging technology.
Background technology
Concrete dam is bulky, and the dam body cracking is a comparatively general phenomenon in actual engineering.At home and abroad on the dam worker history, can be found everywhere by the concrete dam of crack infringement, in numerous factors that influence concrete dam safety, the dam concrete crack has received dam worker's common concern.Although since the thirties in 20th century, hydraulic engineering circle paid attention to how preventing the concrete dam problem of cracks, and done a large amount of research work, also obtained many achievements, and " no dam does not split " become undisputable fact.Simultaneously; Generally all there is problem of aging in concrete; Important hydraulic concrete buildings requires normal operation 100 ∽ 150 years. but in many at home and abroad concrete workes; Concrete aging and brokenization just appearred after several years or decades. and like freeze thawing, seepage, carbonization stream wash away, wearing and tearing, cavitation erosion, alkali-aggregate reaction etc. cause concrete destruction or wear out, destruction directly influences the benefit of hydraulic structure, even jeopardizes the normal safe operation of building.
Academia generally believes that the generation of distress in concrete is the coefficient result of multiple factor at present; Except the variations in temperature factor; Concrete autogenous volume contraction, the dry contraction of dehydration reach with other relevant shrinkage strains of volume of concrete distortion all can cause the generation of distress in concrete, and wherein plays a leading role with variations in temperature.And the reason of concrete aging to be extraneous environmental factor decision as seepage corrode acidic materials erosion or the like.
The crack that dam concrete produced, the overwhelming majority is an external crack, wherein a part can develop into deep layer or penetrability crack, influences the globality and the durability of dam or concrete slab.The reason that causes the dam external crack mainly is wet difference and thermal stresses.Some countries just begin to note interim surface heat preservation as far back as the 1950's.Surface heat preservation and conserving material are a lot, and the dam face slab that has adopts plastic foamboard or cardboard insulation; The employing layer of sand insulation that has; The employing plastic foamboard that has adds the polyvinyl chloride film; Fill out the heat-barrier material of wood shavings in the employing two bed thickness templates that have, the Movable tent that the employing that also has is risen has automatically been created the local artificial weather in tent, complete and isolation during concrete pouring, and summer, concrete pouring was lowered the temperature with flowing water; But practice has still produced many cracks after showing above-mentioned heat insulating material enforcement.Initial main straw bag and the straw screen or mat of adopting is incubated in China, but their easy firings, and fire hazardous is not durable, and rots once making moist, and is not desirable heat insulating material.Once used woodwool board in the area, Northeast China, sprayed cement-expanded perlite, though these materials have certain insulation effect, the back insulation effect of making moist falls sharply.After the eighties, foamed plastics becomes main heat insulating material.Present widely used heat insulating material mainly contains polystyrol plastic foam plate, insulation quilt, polyvinyl air bubble film, polyethylene foams plate etc., and job practices commonly used has three kinds of interior subsides method, outer subsides method and spraying processes.No matter interior subsides or outer the subsides all are to adopt cohesive material that heat insulating material is sticked on the dam concrete surface, spraying then is to utilize high-pressure installation that heat insulating material is injected directly on the dam concrete surface.
To sum up can find out: the heat insulating material of employing is more although present dam is survived the winter, and does not still solve the external crack that dam concrete causes owing to wet difference and thermal stresses well.And the dam concrete problem of aging does not also have good solution.Practice shows: account for 60%～70% of dam external crack owing to humidity changes the shrinkage crack that causes, so the insulation of dam is no doubt important, but it is also very crucial to preserve moisture.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art; Taking into full account on the coupled characteristic basis of dam concrete temperature conduction and humidity transfer; Proposed dam cracking resistance and age inhibiting method, made that it has that cracking resistance is good, good looking appearance, thermal insulation, performance of keeping humidity is good and construct advantage such as simple based on warm and humid coupling.
Dam cracking resistance and age inhibiting method based on warm and humid coupling that the present invention proposes is characterized in that in the dam concrete surface coverage one deck polyurethane foam+polyester mortar or mortar heat and moisture preserving layer being arranged.At CFRD, the concrete slab surface coverage polyurethane foam+polyester mortar or mortar heat and moisture preserving impervious barrier are arranged.
Face is coated with polyurethane foam+polyester mortar or mortar heat and moisture preserving impervious barrier in the upstream and downstream of arched concrete dam.
Concrete surface in the upstream and downstream of concrete gravity dam face or dam bottom outlet, table hole is coated with polyurethane foam or polyurethane surface is coated with polyester mortar or mortar heat and moisture preserving impervious barrier again,
Layer thickness is preserved moisture in above-mentioned said polyurethane foam insulation can be in the scope of 1cm～15cm, and the thickness of polyester mortar or mortar can be in 0.5cm～5cm scope.Described hard polyurethane foam material comprises isocyanates and polyhydric alcohol conjugate polyether (black+white, two components), can adopt outer subsides method, perfusion and spraying process to make hard polyurethane foam heat and moisture preserving impervious barrier and dam concrete surface or panel secure bond.Polyester mortar or mortar can prevent the aging of hard polyurethane foam.Hard polyurethane foam can keep 30 ∽ 50 years, fully prevented concrete quick aging.The polyurethane coating construction has strict working measure, and reaction time, curing rate, atomizing blast and construction environment to material during spraying all will have sufficient understanding, and spraying application is taked following control measure:
A. control the reaction time, promptly control material and spray to by color on the spray thing surface and bleach time of (referring to that first floor turns white), generally be controlled at 3-7s, if too fast easily stifled spray gun, too slow the generation easily run off or drip phenomenon, forms the inhomogeneities of spraying.
B. control curing rate, be often referred to foam and initiate tack-free time of back epidermis or complete hardening time, general manual foaming is controlled at 12-20s, and the spray coating foaming time is at 3-7s.
C. adjust the atomizing blast, according to the flow difference of prescription and the size variation of material caking ability, the required blast after adjustment atomizes, general blast is controlled at 0.4509-1.7658Mpa.
D. control quantity for spray, it is flat that big flow spraying is difficult for spray, takes the flow about 1kg/ms, and the about 0.5-0.8m/s of the translational speed of spray gun, the depth of foam of individual layer spraying be at 10mm-25mm, the about 1000-1400mm of spacing of spray gun and material object.
E. take the intensification measure, cream time was longer when the spray surface temperature was low, and foaming back bottom density is big, and it is not firm to bond, and foam comes off from body surface easily, and needing this moment increases catalyst amount, perhaps adds thermal spray compressed air, and heating-up temperature is 40 ℃-60 ℃.
Polyurethane foam insulation is preserved moisture before layer construction test; We have carried out detail analysis to the weather conditions on construction ground, the characteristic of polyurethane spray foam, the technology of spraying polyurethane material; Estimate the problem that possibly run in the spraying polyurethane rigid foam work progress, formulated and followed following principle:
A. principle of temporal sequence.When the spraying polyurethane hard foam, should principle in order construct,, can control coating quality effectively like this as spraying from top to down or on to descending.
B. layering sprays principle.The layering spraying is main construction technology in spraying application.During the polyurethane spray foam material, generally once must not surpass 15mm, polyurethane can obtain sufficient space when reacting like this.Just might bore a hole if spray too thick foam, make it can not get good rate of closed hole, directly cause the quality of foam.
C. even decentralization principle.In the spraying application; " evenly disperse " to be meant that the hard polyurethane foam material of spraying should evenly disperse, before spraying, will correctly select spray gun and spray gun rifle mouth for use, flat spray or circle Spray gun nozzle are mainly selected in generally flat spray for use; As in spraying process, not doing even dispersion; The formed foam in spraying back will be rough and uneven in surface, influences the attractive in appearance and quality of dam, but also will waste polyurethane material.
D. constant temperature principle.Constant temperature mainly is to say hard polyurethane foam material, in Raw material pail, is extracting the back before the spray gun ejection through the one-level pump, require material can constant temperature at the optimal reaction temperature of hard polyurethane foam material.
E. security doctrine.Because the constructor will contact with chemicals all the time in work progress, when spraying, also must keep certain pressure and temperature, this has not only improved the requirement to spraying equipment, also safety is had higher requirement simultaneously.Therefore in whole construction course, all to embody the principle of " safety first " constantly.
The action effect of the present invention and the scope of application
The present invention with polyurethane coating in dam concrete surface or panel; Have good looking appearance, thermal insulation and moisture retention good, solidify fast, free from environmental pollution, characteristics such as construction is simple and convenient,, good endurance bonding firmly with concrete surface; Its thermal insulation and performance of keeping humidity are stable; Because of climate change big fluctuation does not take place; Hard polyurethane foam is suitable for heat and moisture preserving is carried out on dam concrete surface or concrete slab, and avoids concrete to contact with external environment, effectively prevents the generation and concrete the wearing out of concrete surface crack.
The present invention is applicable to the anti-aging of preserving moisture of dam thermal insulation, is specially adapted to cause owing to variations such as temperature gradient and wet differences the large volume concrete structural of face checking, has obtained good comprehensive technology, social environment benefit.
Show in actual application in engineering: the inventive method is very effective for the generation that prevents the dam external crack, concrete aging, compares with other means of defence, and is not only attractive in appearance but also economical.
Description of drawings
Fig. 1 has the arch dam sectional drawing of hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer for surface coverage.
Fig. 2 has the gravity dam sectional drawing of hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer for surface coverage.
Fig. 3 has the face dam sectional drawing of hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer for surface coverage.
Among the figure, 1 is the axis of dam, and 2 is the hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer that covers at concrete surface, and 3 is the dam concrete panel of rock.
The specific embodiment
The method at concrete exposed face spraying polyurethane rigid foam heat and moisture preserving antiseepage anti-aging layer that the present invention proposes specifies as follows:
Case history
(1) the sub-engineering of Xinjiang crossdrift
1, crossdrift sub-engineering in Xinjiang is a rolled concrete arch dam, maximum height of dam 109m, and the maximum camber line of dam crest is long to be 176.5m.
2, the total side of concrete amount 21.1 ten thousand m
3, roller compacted concrete 18.8 ten thousand m wherein
3, account for 89% of concrete total amount.
3, dam site area is cold winter, and temperature on average is 4.1 ℃ for many years, 33.2 ℃ of the extreme highest temperatures, the extreme lowest temperature-31.5 ℃, monthly mean temperature sub-zero for up to 5 months.The daily temperature fluctuation is bigger.
4, mean annual precipitation 430mm, average evaporation capacity 1410.8mm for many years.
Embodiments of the invention are shown in accompanying drawing 1, for preventing that shown in the accompanying drawing 12: surface coverage has hard polyurethane foam heat and moisture preserving impervious barrier in the rolled concrete arch dam upstream and downstream owing to the temperature difference or the wet poor concrete surface crack that causes.
The used hard polyurethane foam (PU) of the hard polyurethane foam heat and moisture preserving impervious barrier of present embodiment comprises isocyanates (MDI)+polyalcohol (combined polyether)+catalyzer; Foam stabiliser, blowing agent, fire retardant, mill base; Or be called for short and deceive material+two components of white material; Wherein the blowing agent CFC is because boiling point is low, thermal conductivity is low, and the volatilization of being heated forms gas, is wrapped to form foam by the polyurethane feed liquid.Organic tin or amines catalyst mainly are the speeds that is used for controlling main reaction, and what of catalyzer addition can be controlled at 1～15s with the reaction time, and the reaction time of satisfying the spraying condition is generally 3～5s.Three road ethylbenzene stabilizing agents mainly are used for controlling the size of the uniformity coefficient and the abscess of abscess, can promote miscible between emulsion and the solution, can reduce the surface tension of system simultaneously, increase the stability of foam.Fire retardant is long-pending big to foam surface, the inflammable and precautionary measures of making.Mill base adds to the foam color.
Heat insulation effect
1, under atmospheric humidity is 40% situation; 1cm place concrete humidity is 89% under the spraying polyurethane insulation layer; 1cm place concrete humidity is merely 60% under the no spraying polyurethane insulation layer, and there have spraying polyurethane insulation layer humidity to reduce to be about 30%, and moistening effect is good.
2, any surperficial shrinkage crack is not found in the inspection of strip off polyurethane insulation coating by force, and the dam concrete face does not have the carbonization phenomenon.
(2) Tekes territory saliva power plant project
1, Tekes territory saliva power plant project is made up of barrage, outlet structure escape works and key constructions such as generating diversion system and power station factory building.
2, the maximum height of dam 51m of engineering, total reservoir storage 1.21 hundred million m
3, installed capacity 140MW.
3, the dam site area is cold winter, and temperature on average is 8.8 ℃ for many years, extreme 39 ℃ of the highest temperatures (1983.7.31), the extreme lowest temperature-32.0 ℃ (1981.1.22)
As shown in Figure 2, Fig. 2 has the concrete gravity dam dam sectional drawing of hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer for surface coverage.Wherein 1 is the gravity dam axis of dam, and 2 is the hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer that covers at concrete surface.
Heat insulation effect
1, under atmospheric humidity is 45% situation; 1cm place concrete humidity is 85% under the spraying polyurethane insulation layer; 1cm place concrete humidity is merely 55% under the no spraying polyurethane insulation layer, and there have spraying polyurethane insulation layer humidity to reduce to be about 30%, and moistening effect is good.
2, any surperficial shrinkage crack is not found in the inspection of strip off polyurethane insulation coating by force, the no carbonization phenomenon in dam concrete surface.
The specific embodiment
What the present invention designed is the heat and moisture preserving topping that covers one deck hard polyurethane foam+polyester mortar or mortar at the exposed face of dam, and dam is described with reference to the accompanying drawings as follows:
The embodiment of the invention is shown in accompanying drawing 2, for gravity dam: because the concrete surface crack that the temperature difference or wet difference cause, face is coated with the heat and moisture preserving impervious barrier of hard polyurethane foam and polyester mortar or mortar composition in the dam upstream and downstream in order to prevent.
(3) rock
Fig. 3 has the loose rock dam dam sectional drawing of hard polyurethane foam heat and moisture preserving impervious barrier for surface coverage.Wherein 1 is the axis of dam, and 2 is the hard polyurethane foam heat and moisture preserving antiseepage anti-aging layer that covers at concrete surface, and 3 is the dam concrete panel.
The specific embodiment
What the present invention designed is the heat and moisture preserving protection anti-aging layer that covers one deck hard polyurethane foam+polyester mortar or mortar at the panel surface of rock, and dam combines accompanying drawing 3 to specify as follows:
The embodiment of the invention shown in accompanying drawing 3, for rock, for preventing because the panel cracking that the temperature difference or wet difference cause, the heat and moisture preserving impervious barrier of forming by hard polyurethane foam and polyester mortar or mortar in the dam face slab surface coverage.
Polyurethane is used for insulation compares with other heat insulating material, has that good looking appearance, thermal insulation and moisture retention are good, construction is comparatively simple, thermal insulation and bigger advantages such as fluctuation of performance of keeping humidity weatherproof generation.Because water is gone up not dissolving, corrosiveness basically to polyurethane, water and polyurethane Fails To Respond be not so can be come off after the water logging.
Polyurethane itself was the high adhesive of a kind of intensity before not adding blowing agent, and after the adding blowing agent was processed foam, its adhesion stress was still very strong, still can be connected as a single entity with concrete.And it is that water and polyurethane do not react that water does not have dissolution and corrosion effects for polyurethane, can not come off after the water logging, also can be used for the heat and moisture preserving in dam body fluctuation of water table district.
The construction technology of heat and moisture preserving impervious barrier of the present invention adopts spraying process; Select the dual-component coating paint finishing for use; Its operating principle is: compressed air is delivered to one-level pump, two stage pump in the sub-material through pressure regulator valve with compressed air; With delivering to electrical heating or water cooler after the pressurization of two groups of material, deliver in the ejecting gun body through utilidor, mixes to be ejected into behind two kinds of material and sprayed object surface.This paint finishing guarantees to knock off continuously continuously work through three tunnel heating, and has heating of the power of change and temperature control system automatically setting arbitrary temp, and its variation of ambient temperature can be compensated.Different temperatures is set and is guaranteed that different fluid layer materials evenly heat, and avoid self-polymeric reaction.Apolegamy Probler rifle is provided with the air automatic cleaning apparatus in this rifle body, and is totally thorough with the cleaning that gas is accomplished, the obstruction of having avoided general device when piston cleaning rifle body, to cause owing to piston self adhesive.Reaction time (being that the first floor material sprayed to by the painted time that bleaches on the spray thing surface) generally is controlled at 3～7s, too fast easy stifled rifle, too slow loss or the drip phenomenon of taking place easily.Manual foaming is controlled at 12～20s, and the spray coating foaming time is controlled in the 10s.The atomizing blast generally is controlled at 6～8kg/cm
2Spray gun and spacing in kind are 1400mm, spraying optimum speed 1～7kg/min.
The present invention carries out the polyurethane coating construction at whole concrete surface.Weather conditions and required concrete temperature according to the locality calculate required spraying polyurethane rigid foam thickness, and thickness is generally at 1cm～15cm.Cause hard polyurethane foam heat and moisture preserving impervious barrier, satisfy the requirement of design concrete.
Heat and moisture preserving of the present invention and anti-aging effect
Spraying polyurethane insulation layer after the inside concrete aquation is near maximum temperature value; Can not increase the dam concrete temperature, only can slow down the concrete heat radiation time, can reach the effect of Winter protection cooling in summer; Reduced the temperature gradient of concrete surface greatly; Reduced the thermal stresses of dam concrete, and avoided dam concrete to contact, stoped carbonation of concrete with external environment.Polyurethane insulation coating is well preserved moisture and the antiseepage effect in addition.Research of the present invention and use to give the construction of water conservancy water power and concrete heat-insulating is heat insulation preserves moisture and antiseepage anti-aging aspect provides use hard polyurethane foam spraying coating process scheme has obtained good comprehensive technology and social environment benefit.
Be provided with the made insulation layer of the lower polyurethane material of coefficient of thermal conductivity on the dam body surface; When outside air temperature changes; Inside concrete does not directly carry out exchange heat with atmosphere, thereby makes the concrete temperature gradient mild, plays the effect of reduction skin temperature tensile stress.Even to the runtime, the inside concrete calorific value reduces gradually, and concrete temperature still remains under the good temperature environment under the polyurethane topping, still can play good insulation effect.Polyurethane not only can play good heat insulation effect in the winter time, also can play the effect that reduces the dam facing temperature in summer.
Sprayed polyurethane layer can not increase the dam concrete temperature, only can slow down the concrete heat radiation time, can reach the effect of Winter protection cooling in summer, has reduced the temperature gradient of concrete surface greatly, has reduced the thermal stresses of dam concrete.
Prove through case history: the polyurethane of dam surface coverage and polyester mortar topping do not change the planeness on dam surface; Because the controllability of material color makes dam more attractive in appearance, do not change on the contrary with extraneous humidity in the concrete humidity of implementing under the sprayed polyurethane layer; Humidity remains between 75%～85% basically; Improve concrete humidity greatly, thereby reduced the generation of dam external crack, and slowed down concrete aging speed.
Claims (2)
1. dam cracking resistance and age inhibiting method based on a warm and humid coupling; It is characterized in that said method is on the concrete surface of CFRD or the concrete dam surface coverage has hard polyurethane foam heat and moisture preserving impervious barrier, and at polyurethane surface spraying or covering one deck polyester mortar or mortar topping;
For rock, polyurethane+polyester mortar or mortar heat and moisture preserving impervious barrier are arranged in the face-plate of rockfill dam surface coverage; Thickness is 1cm～15cm;
For gravity dam, the concrete surface in the upstream and downstream of dam face or dam bottom outlet, table hole is coated with polyurethane foam or polyurethane surface is coated with polyester mortar or mortar heat and moisture preserving impervious barrier again; Polyurethane foam thickness is 1cm～15cm, and mortar thickness is 0.5cm～5cm;
For arch dam, surface coverage has polyurethane+polyester mortar or mortar heat and moisture preserving impervious barrier in the concrete dam upstream and downstream, and thickness is 1cm～15cm;
Polyurethane adopts spraying application, and spraying application is taked following control measure:
A. control the reaction time: it is 3-7s that the control material sprays to the time of being turned white by first floor on the spray thing surface;
B. control curing rate: be often referred to foam and initiate tack-free time of back epidermis or complete hardening time, manual foaming is controlled at 12-20s, and the spray coating foaming time is at 3-7s;
C. adjust the atomizing blast: the required blast after the adjustment atomizing is at 0.4509-1.7658Mpa;
D. control quantity for spray: take the flow of 1kg/ms, the translational speed of spray gun is 0.5-0.8m/s, and the depth of foam of individual layer spraying is at 10mm-25mm, and spray gun is 1000-1400mm with spacing in kind.
E. take the intensification measure: heating-up temperature is 40 ℃-60 ℃.
2. dam cracking resistance and age inhibiting method based on warm and humid coupling as claimed in claim 1; It is characterized in that concrete spraying method is:
A. spraying in order: in order principle is constructed when the spraying polyurethane hard foam, from top to down or to down and on spray;
B. layering spraying: layering spraying in spraying application during the polyurethane spray foam material, once must not surpass 15mm;
C. evenly disperse spraying: in the spraying application, the hard polyurethane foam material of spraying evenly disperses;
D. constant temperature spraying: hard polyurethane foam material was extracting the back before the spray gun ejection through the one-level pump in Raw material pail, require material can constant temperature at the optimal reaction temperature of hard polyurethane foam material;
E. safety spraying: in whole construction course, embody the principle of safety first constantly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101363232A CN101824813B (en) | 2009-05-11 | 2009-05-11 | Dam crack and aging resisting method based on coupled temperature and humidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101363232A CN101824813B (en) | 2009-05-11 | 2009-05-11 | Dam crack and aging resisting method based on coupled temperature and humidity |
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| Publication Number | Publication Date |
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| CN101824813A CN101824813A (en) | 2010-09-08 |
| CN101824813B true CN101824813B (en) | 2012-05-30 |
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| CN2009101363232A Ceased CN101824813B (en) | 2009-05-11 | 2009-05-11 | Dam crack and aging resisting method based on coupled temperature and humidity |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102505664B (en) * | 2011-10-29 | 2014-07-02 | 宜昌天宇科技有限公司 | Dam concrete anti-ageing method |
| CN104480901B (en) * | 2014-11-21 | 2016-06-29 | 淮海工学院 | A kind of blocking method of earth and rockfill dam |
| CN109030197B (en) * | 2018-05-02 | 2020-09-08 | 三峡大学 | Concrete fractional order compressive strength model considering temperature-humidity coupling effect |
| CN114960563A (en) * | 2022-04-29 | 2022-08-30 | 宜昌天宇科技有限公司 | Anti-aging structure and method along with increase of strength of dam concrete for long time |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178944A (en) * | 1998-12-14 | 2000-06-27 | Sanei Engineering Kk | Impervious structure for dam |
| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| JP2008142703A (en) * | 2006-11-16 | 2008-06-26 | Dyflex Corp | Water sealing method and water sealing structure |
-
2009
- 2009-05-11 CN CN2009101363232A patent/CN101824813B/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178944A (en) * | 1998-12-14 | 2000-06-27 | Sanei Engineering Kk | Impervious structure for dam |
| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| JP2008142703A (en) * | 2006-11-16 | 2008-06-26 | Dyflex Corp | Water sealing method and water sealing structure |
Non-Patent Citations (1)
| Title |
|---|
| 曹伟等.混凝土坝保温保湿研究.《应用基础与工程科学学报》.2009,第17卷(第2期),179-187. * |
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| CN101824813A (en) | 2010-09-08 |
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Inventor after: Du Bin Inventor after: Tian Bing Inventor after: Liu Guangting Inventor after: Tan Kun Inventor after: Zhang Zirui Inventor after: Zhang Min Inventor after: Du Gang Inventor before: Du Bin Inventor before: Li Penghui Inventor before: Tian Bing Inventor before: Liu Guangting Inventor before: Jin Feng Inventor before: Tan Kun Inventor before: Du Gang |
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