CN103556639A - Construction method for underwater non-dispersible cement-based self-compaction material - Google Patents
Construction method for underwater non-dispersible cement-based self-compaction material Download PDFInfo
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- CN103556639A CN103556639A CN201310465710.7A CN201310465710A CN103556639A CN 103556639 A CN103556639 A CN 103556639A CN 201310465710 A CN201310465710 A CN 201310465710A CN 103556639 A CN103556639 A CN 103556639A
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Abstract
The invention relates to a construction method for an underwater non-dispersible cement-based self-compaction material. The construction method includes that (1) an underwater pouring position is determined; (2) a cement-based self-compaction material pouring point and a water-soluble high-molecular polymer solution perfusion point are respectively set and definitely communicated with the underwater pouring position; (3) water-soluble high-molecular polymers are dissolved in water to form a water-soluble high-molecular polymer solution, the water-soluble high-molecular polymer solution is poured into the underwater pouring position through the water-soluble high-molecular polymer solution perfusion point, the water-soluble high-molecular polymers are dissolved in water so as to change physical properties of water, and the cement-based self-compaction material is enabled to enter the water-soluble high-molecular polymer solution and can not be dispersed; (4) the cement-based self-compaction material is poured into water through the cement-based self-compaction material pouring point and tightly and fully filled in the underwater pouring position by the aid of self weight of the cement-based self-compaction material to finally form underwater non-dispersible concrete.
Description
Technical field
The present invention relates to a kind of cement based self-compaction material job practices of not disperseing under water, particularly the job practices under a kind of underwater environment under different size, form and flow conditions.
Background technology
Since non-dispersible underwater concrete (Underwater Non-Dispersible Concrete is called for short NDC) technology is imported China into from the eighties, its application technology development and raising.Non-dispersible underwater concrete, also referred to as underwater casting concrete, is a kind of can building under water, can, as ordinary concrete, not gather materials, with cement paste, separated concrete special occurs under the effect of water.Be mainly used at present the construction of the concrete in mass under water of the engineering fields such as water conservancy, ocean, petrochemical industry, coal, range of application many provinces and cities that spread all over the country.As: three phase of Qinshan nuclear power plant intake engineering (pumping), the 600 tons of straddle truck bearing platforms in Shanghai (pumping), Feng Huai line Yellow River Bridge coffering, the Shang Xin village, puckery peaceful blue long-distance transport pipes Huangzhong County B327～B328 bid section, yangtze river in nanjing water intake engineering, Dalian, Qingdao harbour are repaired, Yalu River bank protection work, Qiantang River embankment stabilization works etc.
Non-dispersible underwater concrete be by take flocculant be main under water not dispersing agent join in green concrete, can pass through " crane span structure " effect of the macromolecule long-chain of flocculant, make mixture form stable spatial flexible network structure, improve the cohesion of green concrete, the dispersion of restriction green concrete, emanate and avoid cement to run off, and can be under water the even concrete of moulding.Existing cement-based material comprise concrete, mortar, clean slurry etc. realize under water the main solution of not disperseing be preparation various based on flocculant and tackifier under water not dispersing agent joined in cement-based material, according to the correlation test standard of China's non-dispersible underwater concrete, the slump of non-dispersible underwater concrete is not less than 210mm-250mm, divergence is 430mm-470mm left and right, this,, with regard to making prepared cement-based material have the shortcomings such as cost is high, viscosity is large, mobile performance is not enough, cannot realize high mobile self-compacting ability under water.
Self-compacting concrete is that Tokyo Univ Japan's concrete experiments chamber is in the new concrete technology of exploitation in 1988, although there is high flowing and high education resistance energy in air, but after chance water, there is serious separation, cannot adapt to underwater concrete construction condition.If add under water not dispersing agent in self-compacting concrete, can be that concrete viscosity sharply increases, cause concrete flowability energy and self-compacting ability significantly to reduce, the retention time of its mobile performance also can be received serious impact, therefore cannot be by adding under water the not mode of dispersing agent to make the self-compacting concrete under water approaching with air performance.
Summary of the invention
The present invention has designed a kind of cement based self-compaction material job practices of not disperseing under water, the technical problem of its solution is: (1) existing non-dispersible underwater concrete, underwater grouting material are by adding concrete and grouting agent to improve its anti-dispersibility under water flocculant or tackifier, formed underwater cement sill cost is high, viscosity is large, mobility is bad, and construction technology is comparatively complicated simultaneously.(2) anti-seepage repair can solve the problem of meeting aqueous dispersion by different chemical material, but compare the marine material cost of cement based high, pollute large.
In order to solve the technical problem of above-mentioned existence, the present invention has adopted following scheme:
A cement based self-compaction material job practices of not disperseing, comprises the following steps: step 1: determine underwater casting position (4); Step 2: one or more cement based self-compaction materials are set respectively and build point (5) and one or more high molecular weight water soluble polymer solution perfusion point (6), cement based self-compaction material is built point (5) and all must be communicated with underwater casting position (4) with high molecular weight water soluble polymer solution perfusion point (6); Step 3: high molecular weight water soluble polymer (2) is dissolved in the water and forms high molecular weight water soluble polymer solution (3), by high molecular weight water soluble polymer solution, pour into point (6) to underwater casting position (4) injected water soluble macromolecular polymer solution (3), high molecular weight water soluble polymer (2) thus in water, dissolve to change the physical property of water, cement based self-compaction material (1) is entered in high molecular weight water soluble polymer solution (3) and does not disperse; Step 4: build point (5) to joints cement base self-compaction material (1) in water by cement based self-compaction material, casting process need not vibrate, and relies on cement based self-compaction material (1) deadweight that underwater casting position (4) filling is closely knit and finally form non-dispersible underwater concrete.
Further, in step 1, by template (7), reinforced gabion (8) or jackstone accumulation body (9), build the described underwater casting position (4) of various structures.
Further, for the underwater portion in leakage passage and basic crack under water, template (7), reinforced gabion (8) or jackstone accumulation body (9) cannot be set, in step 1, by controlling the distance that flows under water of cement based self-compaction material (1), always control filling scope to determine underwater casting position (4).
Further, the high molecular weight water soluble polymer solution perfusion point (6) in step 2 is dispersed in underwater casting position (4), and the cement based self-compaction material in step 2 is built the bottom that point (5) is arranged in underwater casting position (4).
Further, when the water in underwater casting position (4) is moving water, the upstream side that high molecular weight water soluble polymer solution perfusion point (6) is placed in to water (flow) direction, makes high molecular weight water soluble polymer (2) can evenly be full of whole underwater casting position (4).
Further, in step 3, high molecular weight water soluble polymer solution (3) is pressed in the mode injected water pouring into by flowing automatically or having.
Further, in step 4 by cement based self-compaction material (1) by duct free flow automatically, conduit (10) flows automatically or have and press pumping mode to build in underwater casting position (4).
Further, the raw material such as the use cement and mineral admixture in step 4 (flyash, slag, stone flour etc.), sand, stone and water reducing agent, preparation is not emanated, the cement based self-compaction material (1) of bleeding, cement based self-compaction material (1) comprises in self-compacting concrete, mortar and clean slurry one or more, and having does not vibrate relies on deadweight by the closely knit ability of space filling.Adopt the test of Control Measures for Concrete Slump divergence to detect, cement based self-compaction material (1) slump consistancy test value >=220mm in air and underwater environment, divergence test value >=500mm.
The cement based self-compaction material job practices that this does not disperse is under water compared with existing non-dispersible underwater concrete job practices, has following beneficial effect:
(1) the present invention passes through the physical property of high molecular weight water soluble polymer change water soluble in water, cement based self-compaction material is not disperseed in water, realized when cement based self-compaction material is built in water do not disperse, do not emanate, self-compaction and can the various spaces under water of filling and the performance of sclerosis, keep the original various performance indications of concrete, made the construction of self-compacting concrete under water become possibility.
(2) the inventive method is applicable under different in flow rate, the underwater environment construction of different size, form, such as underwater structure and structure, build, solution cavity crack shutoff under water, there is the foundation grouting of underground water etc., can simplify technique, pick up speed, raising success rate, can reduce construction cost simultaneously.
(3) in cement based self-compaction material of the present invention, do not need to add the anti-dispersion class Admixture under water such as tackifier, flocculant, can reduce the cost of underwater concrete construction, underwater grouting.
(4) cement based self-compaction material used in the present invention, has high fluidity energy and has realized under water and not disperseed in the time of the closely knit performance of filling, can flow automatically and have to press the space of various yardsticks under water to build.
(5) the present invention compares existing underwater concrete technology, has improved the anti-dispersibility of concrete material in water, thereby has reduced underwater concrete construction difficulty, has improved the compliance of underwater concrete construction to engineering-environment.
Accompanying drawing explanation
Fig. 1: the cement based self-compaction material job practices schematic diagram that the present invention does not disperse under water
Fig. 2: the cement based self-compaction material that the present invention does not disperse has under water been built schematic diagram;
Fig. 3: template replacement scheme schematic diagram under water in the present invention;
Fig. 4: in the present invention, self-compaction material freely falls into the water and builds schematic diagram;
Fig. 5: in the present invention, self-compaction material enters water through conduit and relies on deadweight to build schematic diagram;
Fig. 6: in the present invention, self-compaction material has press pump to send through conduit to build schematic diagram.
1-cement based self-compaction material; 2-high molecular weight water soluble polymer; 3-high molecular weight water soluble polymer solution; 4-underwater casting position; 5-cement based self-compaction material is built a little; 6-high molecular weight water soluble polymer solution perfusion point; 7-template; 8-reinforced gabion; 9-jackstone accumulation body; 10-conduit; 11-pump.
The specific embodiment
Below in conjunction with Fig. 1 to Fig. 6, the present invention will be further described:
(1) for required underwater sites of building, template 7 is set, has natural obstruct or the existing position intercepting that template need not be set.For underwater structure and structure, normally there is concrete shape requirement, should template 7 be set at the external boundary of works, when the external boundary shape of works and structure is less demanding, can adopt reinforced gabion 8 or jackstone accumulation body 9 that obstruct is set.Underwater portion in leakage passage and basic crack under water, cannot arrange template, can control filling scope by controlling the mobile distance of concrete material.
(2) according to required underwater sites of building, determine that cement based self-compaction material builds a little 5 and the position of high molecular weight water soluble polymer solution perfusion point 6, build a little and perfusion point can be one can be also a plurality of, all should be connected with underwater casting position 4, and should be placed in as far as possible its inside.
High molecular weight water soluble polymer solution perfusion point 6 should be dispersed in underwater casting position 4 as far as possible, during moving water, should consider water (flow) direction, is placed on the upstream side of water (flow) direction as far as possible, can evenly be full of whole underwater casting position 4.Cement based self-compaction material is built a little 5 bottoms that should as far as possible be arranged in underwater casting position 4.
(3) high molecular weight water soluble polymer 2 is dissolved in the water, the high molecular weight water soluble polymer solution 3 that dissolving is completed is by the mode injected waters such as pressing perfusion that flows automatically, has, making it build under water position 4 disperses, high molecular weight water soluble polymer solution 3 can further dissolve at normal temperatures in water, cement based self-compaction material 1 does not disperse therein, and cementitious material amount of damage should be less than 1% of gross mass.
Water-soluble high molecular weight water soluble polymer solution 3 generally disperses in the water that flows into underwater casting position 4 by the mode of conduit, self-flow rate is spent in the time of maybe cannot flowing automatically slowly and can be injected by the mode of pressure pumping, can disposable whole injection after-pouring concrete under hydrostatic condition, under moving water condition, should consider loss that current cause make-up solution in time.After cement based self-compaction material 1 is built, it is limpid that the liquid at underwater casting position 4 should keep, and the phenomenon that cementitious material is disperseed does not occur.
(4) then by cement based self-compaction material 1 by duct free flow automatically, conduit gravity flow or have the modes such as press pump send to build to underwater casting position 4, cement based self-compaction material 1 performance of building detects by the test of Control Measures for Concrete Slump divergence, slump consistancy test value >=220mm, divergence test value >=500mm.
In concrete enforcement, first high molecular weight water soluble polymer 2 is fully dissolved in the water and makes 3 uses of high molecular weight water soluble polymer solution, basic identically on land with 200 times of solution dilution liquid of service behaviour of self-compaction material there is not significant change, its stable work in work can maintain 1-6 hour, and in water, time of setting and land are basic identical; For self-compacting concrete under water, can realize its slump >=250mm, during divergence >=600mm, in hydrostatic, cementitious material number of dropouts is less than 0.5%; For self-compacting mortar under water, can realize as its slump >=280mm, during divergence >=800mm, in hydrostatic, cementitious material number of dropouts is less than 0.5%; There is not obvious dispersion in the moving water-borne glue gel material of flow velocity 0.5m/s; Its land and water compressive strength rate >=70%.Under the engineering water of Hubei, in solution cavity shutoff project, using the method is 5m to depth of water 30m place, length >100m, flow
3the irregular solution cavity that runs through of/s has carried out shutoff, mode by boring has been constructed self-compaction material pouring hole and high molecular weight water soluble polymer solution fill orifice at the solution cavity top rock mass 70m that holes downwards, the building with the method such as cement paste pressure grouting the complete shutoff of solution cavity of the perfusion by high molecular weight water soluble polymer solution, self-compacting mortar; Cement mortar divergence>=800mm that shutoff is used, cement paste divergence>=600mm, cementitious material number of dropouts is all less than 1%, and shutoff process middle and lower reaches have no the cement paste of dispersion.
By reference to the accompanying drawings the present invention has been carried out to exemplary description above; obvious realization of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all in protection scope of the present invention.
Claims (8)
1. a cement based self-compaction material job practices of not disperseing under water, comprises the following steps: step 1: determine underwater casting position (4); Step 2: one or more cement based self-compaction materials are set respectively and build point (5) and one or more high molecular weight water soluble polymer solution perfusion point (6), cement based self-compaction material is built point (5) and all must be communicated with underwater casting position (4) with high molecular weight water soluble polymer solution perfusion point (6); Step 3: high molecular weight water soluble polymer (2) is dissolved in the water and forms high molecular weight water soluble polymer solution (3), by high molecular weight water soluble polymer solution, pour into point (6) to underwater casting position (4) injected water soluble macromolecular polymer solution (3), high molecular weight water soluble polymer (2) thus in water, dissolve to change the physical property of water, cement based self-compaction material (1) is entered in high molecular weight water soluble polymer solution (3) and does not disperse; Step 4: build point (5) to joints cement base self-compaction material (1) in water by cement based self-compaction material, casting process need not vibrate, and relies on cement based self-compaction material (1) deadweight that underwater casting position (4) filling is closely knit and finally form non-dispersible underwater concrete.
2. the cement based self-compaction material job practices of not disperseing under water according to claim 1, is characterized in that: the described underwater casting position (4) of building various structures in step 1 by template (7), reinforced gabion (8) or jackstone accumulation body (9).
3. the cement based self-compaction material job practices of not disperseing under water according to claim 1, it is characterized in that: for the underwater portion in leakage passage and basic crack under water, template (7), reinforced gabion (8) or jackstone accumulation body (9) cannot be set, in step 1, by controlling the distance that flows under water of cement based self-compaction material (1), always control filling scope to determine underwater casting position (4).
4. the cement based self-compaction material job practices of not disperseing under water according to claim 1, it is characterized in that: the high molecular weight water soluble polymer solution perfusion point (6) in step 2 is dispersed in underwater casting position (4), and the cement based self-compaction material in step 2 is built the bottom that point (5) is arranged in underwater casting position (4).
5. according to the cement based self-compaction material job practices of not disperseing under water described in claim 1 or 4, it is characterized in that: when the water in underwater casting position (4) is moving water, the upstream side that high molecular weight water soluble polymer solution perfusion point (6) is placed in to water (flow) direction, makes high molecular weight water soluble polymer (2) can evenly be full of whole underwater casting position (4).
6. the cement based self-compaction material job practices of not disperseing under water according to claim 1, is characterized in that: in step 3, high molecular weight water soluble polymer solution (3) is pressed in the mode injected water pouring into by flowing automatically or having.
7. the cement based self-compaction material job practices of not disperseing under water according to claim 1, is characterized in that: in step 4 by cement based self-compaction material (1) by duct free flow automatically, conduit (10) flows automatically or have and press pumping mode to build in underwater casting position (4).
8. according to the cement based self-compaction material job practices of not disperseing under water described in any one in claim 1 to 7, it is characterized in that: the cement based self-compaction material (1) in step 4 comprises in self-compacting concrete, mortar and clean slurry one or more, adopt the test of Control Measures for Concrete Slump divergence to detect, cement based self-compaction material (1) slump consistancy test value >=220mm in air and underwater environment, divergence test value >=500mm.
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| CN107515176A (en) * | 2017-08-30 | 2017-12-26 | 中交武汉港湾工程设计研究院有限公司 | Dispersion resistance energy method of testing under a kind of cement base slurry water |
| CN107673700A (en) * | 2017-11-01 | 2018-02-09 | 深圳港创建材股份有限公司 | A kind of the underwater of lower shrinkage does not decompose self-compacting concrete |
| CN108341629A (en) * | 2018-03-05 | 2018-07-31 | 沙焕焕 | As bottom reinforcing regardless of aproll soil and its construction method |
| CN108546007A (en) * | 2018-04-02 | 2018-09-18 | 清华大学 | Structuring cement particle material and preparation method thereof |
| CN108755576A (en) * | 2018-07-24 | 2018-11-06 | 交通运输部天津水运工程科学研究所 | A kind of levee construction monsoon phase means of defence based on cementingization block stone |
| CN109750672A (en) * | 2019-02-12 | 2019-05-14 | 交通运输部天津水运工程科学研究所 | A kind of embedding rock pillar earth-filling method of offshore wind farm |
| CN109763491A (en) * | 2018-12-30 | 2019-05-17 | 中铁广州工程局集团有限公司 | It is a kind of not disperse self-compact concrete in construction method under water |
| WO2019169956A1 (en) * | 2018-03-07 | 2019-09-12 | 清华大学 | Structured cemented gravel pile and construction method therefor |
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| CN108755576A (en) * | 2018-07-24 | 2018-11-06 | 交通运输部天津水运工程科学研究所 | A kind of levee construction monsoon phase means of defence based on cementingization block stone |
| CN109763491A (en) * | 2018-12-30 | 2019-05-17 | 中铁广州工程局集团有限公司 | It is a kind of not disperse self-compact concrete in construction method under water |
| CN109750672A (en) * | 2019-02-12 | 2019-05-14 | 交通运输部天津水运工程科学研究所 | A kind of embedding rock pillar earth-filling method of offshore wind farm |
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