CN103556639B - 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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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 construction method of not disperseing under water, the construction method particularly 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 imports China into from the eighties, its application technology development and raising.Non-dispersible underwater concrete, also referred to as concrete placed under water, is that one can be built under water, can not as ordinary concrete, and gather materials the concrete special be separated with cement paste under the effect of water.Be mainly used in the construction of the concrete in mass under water of the engineering fields such as water conservancy, ocean, petrochemical industry, coal at present, range of application spreads all over the country many provinces and cities.As: Qinshan nuclear power plant three phase intake engineering (pumping), 600 tons, Shanghai straddle truck bearing platform (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 joins in green concrete by the underwater anti-washout agent based on flocculant, " crane span structure " by the high polymer long chain of flocculant acts on, mixture is made to form stable spatial flexible network structure, improve the cohesion of green concrete, limit the dispersion of green concrete, emanate and avoid cement to run off, and concrete that can be evenly shaping under water.It is that the various underwater anti-washout agent based on flocculant and tackifier of preparation is joined in cement-based material that existing cement-based material comprises the primary solutions that concrete, mortar, clean slurry etc. realize not disperseing under water, according to the correlation test specification of China's non-dispersible underwater concrete, the slump of non-dispersible underwater concrete is not less than 210mm-250mm, divergence is about 430mm-470mm, there is the shortcomings such as cost is high, viscosity is large, mobile performance is not enough with regard to making prepared cement-based material in this, cannot realize high flowing self-compacting ability under water.
Self-compacting concrete is that Tokyo Univ Japan's concrete experiments room is in the new concrete technology of exploitation in 1988, although have high flowing and high education resistance energy in atmosphere, but namely there is serious separation after chance water, underwater concrete construction condition cannot be adapted to.If add underwater anti-washout agent in self-compacting concrete, concrete viscosity sharply increases, concrete flowability energy and self-compacting ability is caused significantly to reduce, the retention time of its mobile performance also can receive serious impact, therefore cannot be made the underwater self-compaction concrete close with performance in air by the mode adding underwater anti-washout agent.
Summary of the invention
The present invention devises a kind of cement based self-compaction material construction method of not disperseing under water, its technical problem solved is: (1) existing non-dispersible underwater concrete, underwater grouting material are by adding concrete and grouting agent improves its anti-dispersibility under water by flocculant or tackifier, the underwater cement sill cost formed is high, viscosity is large, mobility is bad, and construction technology is comparatively complicated simultaneously.(2) anti-seepage repair solves the problem of meeting aqueous dispersion by different chemical materials, but the marine material cost comparing cement based is high, it is large to pollute.
In order to solve the technical problem of above-mentioned existence, present invention employs following scheme:
A cement based self-compaction material construction method of not disperseing under water, comprises the following steps: step 1: determine underwater casting position (4); Step 2: arrange one or more cement based self-compaction material respectively and build point (5) and one or more high molecular weight water soluble polymer infusion 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 infusion 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), high molecular weight water soluble polymer solution (3) is injected to underwater casting position (4) by high molecular weight water soluble polymer infusion point (6), high molecular weight water soluble polymer (2) dissolves thus changes the physical property of water in 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 by closely knit for underwater casting position (4) filling and finally form non-dispersible underwater concrete.
Further, the described underwater casting position (4) of various structure is built in step 1 by template (7), reinforced gabion (8) or jackstone accumulation body (9).
Further, for the underwater portion in leakage passage under water and basic crack, template (7), reinforced gabion (8) or jackstone accumulation body (9) then cannot be set, by controlling the flow distance under water of cement based self-compaction material (1) thus controlling filling scope to determine underwater casting position (4) in step 1.
Further, high molecular weight water soluble polymer infusion point (6) in step 2 is communicated with underwater casting position (4), and the cement based self-compaction material in step 2 is built point (5) and is communicated with underwater casting position (4).
Further, when water in underwater casting position (4) is for dynamic water, high molecular weight water soluble polymer infusion point (6) is placed in the upstream side of water (flow) direction, makes high molecular weight water soluble polymer (2) evenly can be full of whole underwater casting position (4).
Further, in step 3, high molecular weight water soluble polymer solution (3) is injected water by the mode of flowing automatically or have pressure to pour into.
Further, in step 4, cement based self-compaction material (1) flow automatically by duct free gravity flow, conduit (10) or have pressure mode of movement to build in underwater casting position (4).
Further, the raw material such as use cement and mineral admixture (flyash, slag, stone flour etc.), sand, stone and water reducing agent in step 4, preparation is not emanated, the cement based self-compaction material (1) of bleeding, cement based self-compaction material (1) to comprise in self-compacting concrete, mortar and clean slurry one or more, and having does not vibrate relies on deadweight by ability closely knit for space filling.Adopt Control Measures for Concrete Slump divergence testing inspection, cement based self-compaction material (1) slump consistancy test value >=220mm, divergence test value >=500mm in air and underwater environment.
The cement based self-compaction material construction method that this does not disperse under water, compared with existing non-dispersible underwater concrete construction method, has following beneficial effect:
(1) the present invention passes through the physical property of change water soluble in water for high molecular weight water soluble polymer, cement based self-compaction material is not disperseed in water, achieve when cement based self-compaction material is built in water do not disperse, do not emanate, self-compaction and can the various space under water of filling the performance of sclerosis, maintain the original various performance indications of concrete, make the construction of underwater self-compaction concrete become possibility.
(2) under the inventive method is applicable to different in flow rate, the underwater environment construction of different size, form, such as underwater structure and structure are built, solution cavity crack shutoff under water, have the foundation grouting etc. of underground water, can Simplified flowsheet, pick up speed, raising success rate, can construction cost be reduced simultaneously.
(3) do not need in cement based self-compaction material of the present invention to add the anti-dispersion class Admixture under water such as tackifier, flocculant, the cost of underwater concrete construction, underwater grouting can be reduced.
(4) cement based self-compaction material used in the present invention, has high fluidity energy and achieves while the closely knit performance of filling and do not disperse under water, can flow automatically to the space of various yardstick under water and have pressure to build.
(5) the present invention compares existing underwater concrete technology, improves the anti-dispersibility of concrete material in water, thus reduces underwater concrete construction difficulty, improve the compliance of underwater concrete construction to engineering-environment.
Accompanying drawing explanation
Fig. 1: the cement based self-compaction material construction method 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 under water has 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 through conduit enter water rely on deadweight 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 infusion point; 7-template; 8-reinforced gabion; 9-jackstone accumulation body; 10-conduit; 11-pump.
Detailed description of the invention
Below in conjunction with Fig. 1 to Fig. 6, the present invention will be further described:
(1) for needed for the underwater sites of building template 7 is set, have natural obstruct or the existing position intercepted that need not template be set.For underwater structure and structure, normally have concrete shape requirement, template 7 should be set at the external boundary of works, works and the external boundary shape of structure less demanding time, can adopt reinforced gabion 8 or jackstone accumulation body 9 obstruct is set.For the underwater portion in leakage passage under water and basic crack, then cannot template be set, filling scope can be controlled by the flow distance controlling concrete material.
(2) according to needed for the underwater sites determination cement based self-compaction material of building build a little 5 and the position of high molecular weight water soluble polymer infusion point 6, build a little and perfusion point can be one also can be multiple, all should be connected with underwater casting position 4, and its inside should be placed in as far as possible.
High molecular weight water soluble polymer infusion point 6 should be dispersed in underwater casting position 4 as far as possible, should consider water (flow) direction, be placed on the upstream side of water (flow) direction as far as possible, evenly can be full of whole underwater casting position 4 during dynamic water.Cement based self-compaction material builds a little 5 bottoms that as far as possible should 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 dissolved is injected water by the modes such as pressure perfusion of flowing automatically, have, make it build position 4 under water to disperse, high molecular weight water soluble polymer solution 3 can dissolve at normal temperatures further in water, cement based self-compaction material 1 does not disperse wherein, and cementitious material amount of damage should be less than 1% of gross mass.
High molecular weight water soluble polymer solution 3 is generally disperseed in the water flowing into underwater casting position 4 by the mode of conduit, self-flow rate is spent when maybe cannot flow automatically slowly and is injected by the mode of pressure pumping, can disposable whole injection after-pouring concrete under hydrostatic condition, the loss that current cause should be considered under river channels and make-up solution in time.After cement based self-compaction material 1 is built, the liquid at underwater casting position 4 should keep limpid, and the phenomenon of cementitious material dispersion does not occur.
(4) then cement based self-compaction material 1 is flow automatically by duct free gravity flow, conduit or had the modes such as press pump send to build to underwater casting position 4, cement based self-compaction material 1 performance built is by Control Measures for Concrete Slump divergence testing inspection, 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 high molecular weight water soluble polymer solution 3 and use, substantially identically in service behaviour on land with 200 times of solution dilution liquid 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 substantially identical; For underwater self-compaction concrete, 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 dynamic 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 intake transformation project, the method is used to be 5m to depth of water 30m place, length > 100m, flow
3the irregular solution cavity that runs through of/s has carried out shutoff, self-compaction material pouring hole and high molecular weight water soluble polymer infusion hole is constructed at the solution cavity top rock mass 70m that holes downwards, by the perfusion of high molecular weight water soluble polymer solution, the building complete for solution cavity shutoff with the method such as cement paste pressure grouting of self-compacting mortar by the mode of boring; Cement mortar divergence>=800mm that shutoff uses, 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.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious realization of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all in protection scope of the present invention without to improve.
Claims (8)
1. a cement based self-compaction material construction method of not disperseing under water, comprises the following steps: step 1: determine underwater casting position (4); Step 2: arrange one or more cement based self-compaction material respectively and build point (5) and one or more high molecular weight water soluble polymer infusion 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 infusion 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), high molecular weight water soluble polymer solution (3) is injected to underwater casting position (4) by high molecular weight water soluble polymer infusion point (6), high molecular weight water soluble polymer (2) dissolves thus changes the physical property of water in 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 by closely knit for underwater casting position (4) filling and finally form non-dispersible underwater concrete.
2. the cement based self-compaction material construction method of not disperseing under water according to claim 1, is characterized in that: the described underwater casting position (4) of being built various structure in step 1 by template (7), reinforced gabion (8) or jackstone accumulation body (9).
3. the cement based self-compaction material construction method of not disperseing under water according to claim 1, it is characterized in that: for the underwater portion in leakage passage under water and basic crack, template (7), reinforced gabion (8) or jackstone accumulation body (9) then cannot be set, by controlling the flow distance under water of cement based self-compaction material (1) thus controlling filling scope to determine underwater casting position (4) in step 1.
4. the cement based self-compaction material construction method of not disperseing under water according to claim 1, it is characterized in that: the high molecular weight water soluble polymer infusion point (6) in step 2 is communicated with underwater casting position (4), utilize the physical property of water soluble polymer change water soluble in water that cement based self-compaction material is not disperseed in water, also can realize not disperseing of the non-self-compaction material of cement based under water, the cement based self-compaction material in step 2 is built point (5) and is communicated with underwater casting position (4).
5. the cement based self-compaction material construction method of not disperseing under water according to claim 1 or 4, it is characterized in that: when the water in underwater casting position (4) is for dynamic water, high molecular weight water soluble polymer infusion point (6) is placed in the upstream side of water (flow) direction, makes high molecular weight water soluble polymer (2) evenly can be full of whole underwater casting position (4).
6. the cement based self-compaction material construction method 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 injected water by the mode of flowing automatically or have pressure to pour into.
7. the cement based self-compaction material construction method of not disperseing under water according to claim 1, is characterized in that: flow automatically by duct free gravity flow, conduit (10) by cement based self-compaction material (1) in step 4 or have pressure mode of movement to build in underwater casting position (4).
8. according to the cement based self-compaction material construction method 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 to comprise in self-compacting concrete, mortar and clean slurry one or more, adopt Control Measures for Concrete Slump divergence testing inspection, cement based self-compaction material (1) slump consistancy test value >=220mm, divergence test value >=500mm in air and underwater environment.
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| CN107515176B (en) * | 2017-08-30 | 2019-07-16 | 中交武汉港湾工程设计研究院有限公司 | Dispersion resistance energy test method 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 |
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| CN108546007B (en) * | 2018-04-02 | 2021-06-11 | 清华大学 | Structured cemented granular material and preparation method thereof |
| CN108755576B (en) * | 2018-07-24 | 2023-05-30 | 交通运输部天津水运工程科学研究所 | Method for protecting breakwater during construction of monument based on cemented 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 |
| CN109750672B (en) * | 2019-02-12 | 2021-05-14 | 交通运输部天津水运工程科学研究所 | Offshore wind power rock-socketed column backfilling method |
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