CN105525616A - Massive concrete pouring method - Google Patents
Massive concrete pouring method Download PDFInfo
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- CN105525616A CN105525616A CN201410576135.2A CN201410576135A CN105525616A CN 105525616 A CN105525616 A CN 105525616A CN 201410576135 A CN201410576135 A CN 201410576135A CN 105525616 A CN105525616 A CN 105525616A
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- grouting
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Abstract
The invention discloses a massive concrete pouring method. The massive concrete pouring method comprises the steps of erecting of formworks, grout making, pouring, curing, secondary pouring and the like. The ratio of the length of cooling pipes to the size of a grouting body serves as a guidance parameter for distributing the cooling pipes, so that the difficulty of secondary grouting is lowered on the premise of ensuring the proper cooling capacity of the cooling pipes, and the usage quantity of the cooling pipes and the cost are reduced; galvanized corrugated pipes or finned galvanized steel pipes are used as the cooling pipes, the contact area between the cooling pipes and the pouring body is enlarged, the stress direction is changed, and complete planar stress is changed to arc stress along the surfaces of the corrugated pipes; part of ice blocks are used for replacing part of water to carry out mixed grout making, and ice particles absorb hydration heat and melt gradually; temperature is not increased while the melting ice particles absorb a large amount of hydration heat, evaporate, dissipate and melt into water, so that the temperature inside the pouring body is further decreased.
Description
Technical field
The present invention relates to a kind of construction method of the body that is in the milk, specifically refer to a kind of casting method of concrete in mass.
Background technology
At present, microdilatancy grouting material is further conventional in the back-grouting of equipment Foundations, and its products characteristics is as follows:
Early strong, high-strength: 1-3 days more than compressive strength 30-50Mpa; Education resistance energy: High Strength Non-shrinking Filling Material overcomes segregation phenomenon on the high side caused because of amount of water in onsite application; Environmental protection: not containing the composition such as benzene homologues, halogenated hydrocarbons, formaldehyde, heavy metal, nontoxic, tasteless, pollution-free, do not fire not quick-fried, can transport by regular general cargo; Micro-expansibility: ensure close contact between equipment and basis, ungauged regions after back-grouting; Self drainage is high: can fill whole space, meets the requirement of equipment back-grouting; Can winter construction: allow to carry out outdoor construction under-10 DEG C of temperature; Durability is strong: through up to a million fatigue tests 50 freeze-thaw cycle experiment intensity without significant change; Cracking resistance ability: because amount of water is uncertain, environment temperature is uncertain and the factor seminess such as curing condition restriction in onsite application.
In current construction technology, the volume that grouting builds is all little, adopts conventional means just can realize, and is greater than 50M for volume
3super large grouting body, beyond example, successful experience is not had to use for reference yet, and grouting agent build from concrete build different, because in grouting agent, the content of cementitious material is far longer than the content of cementitious material in concrete, therefore the heat that the cementitious material in concrete produces in hydration process is far smaller than the heat that the cementitious material in grouting agent produces, and the grouting caused is watered building body and built the impact that is easily subject to heat in forming process and causing the problem such as crackle, crack.
Summary of the invention
The object of the present invention is to provide a kind of casting method of concrete in mass, the grouting being applicable to ultra-large volume grouting body is built, and solves the problem of heat radiation, the generation of Crack prevention.
Object of the present invention is achieved through the following technical solutions:
A casting method for concrete in mass, comprises the following steps:
(A) formwork: formwork in the region of wanted grouting construction, installs cooling tube in the region that thickness reaches 200mm wherein, and the length of cooling tube is 4:1 ~ 12:1 with the ratio of the volume of grouting body, simultaneously at grouting distribution in vivo mounting temperature sensor;
(B) slurrying: utilize mixer that microdilatancy grouting material and water are mixed and made into grouting material;
(C) build: grouting material obtained for step (B) is poured in the mould shape of step (A), shaping;
(D) maintenance: when step (C) starts, the temperature of temperature pick up detection grouting body, when watering inside and surface temperature difference >=15 DEG C of building body, passing into cooling water reduction and watering building body internal temperature, or improving the surface temperature of watering building body in cooling tube;
(E) secondary is built: after step (D) experiences the observation period, drained by the water in cooling tube, and in cooling tube, build the grouting material that step (B) is obtained, cooling tube becomes a part of watering building body.
Method of the present invention is applicable to build volume and is greater than 50M
3ultra-large volume build, step (A) is vital, fixes needing to build shaping region template, and what wherein thickness reached more than 200mm needs to arrange cooling tube wherein, the import and export of cooling tube is all being built external, is communicated with the cooling water in the external world, cooling tube is distributed in as much as possible builds on the body-centered of structure, takes into account the raising of heat-sinking capability simultaneously, should adopt the length of cooling tube (unit is M) with grouting body volume (unit is M
3) than this parameter as arrangement cooling tube guide parameters, if the use amount of cooling tube is inadequate, the heat-sinking capability of local so can be caused poor, be not easy to reduce temperature, do not reach the object overcoming heat radiation, if the quantity of cooling tube is on the high side, the length that pipe so can be caused to arrive increases, inner elbow increases, also cause the increase of grouting resistance simultaneously, be unfavorable for the construction of back-grouting, can when ensureing that the heat-sinking capability of cooling tube is suitable, reduce the difficulty of back-grouting, reduce the use amount of cooling tube simultaneously, reduce costs, at suitable local mounting temperature sensor, can adopt and stay the mode of establishing installing hole in mounting points, when back-grouting, installing hole back-grouting is enriched and fill up, also direct pipeline embedded mode can be adopted, unnecessary cable is cut off after construction, also the unified mode of installing of detection pipeline can be adopted, pipeline is utilized to be wrapped up by many pickup wires, after back-grouting, temperature pick up will water the temperature Real-Time Monitoring in building body forming process and be passed to monitoring place, existing computer program can be utilized to analyze, also digital instrument can be utilized to be monitored by testing staff, carry out the control of temperature according to data message, pulping process in step (B) carries out at grouting areas adjacent as far as possible, should not away from grouting region, while carrying out step (C), temperature pick up is working always, transmits out by the temperature of the grouting agent watered in building body, generally, the internal temperature watering building body is higher than surface temperature, surface temperature is higher than environment temperature, when the temperature of watering building body inside is greater than 15 DEG C with the difference of the temperature on surface, open the circulation pump of cooling tube, make cooling water in cooling tube, flow over interchange of heat unnecessary heat is discharged, reduce to water the temperature difference between building body inside and surface, in like manner, the method that raising also can be adopted to build surface temperature reduces to water the temperature difference between building body inside and surface, in some particular surroundings, the winter field construction of such as severe cold, just can adopt the method improving and build surface temperature, after the observation period, build body formed after, its temperature difference that is inner and surface is less and stable, discharged by water in cooling tube, carry out back-grouting, the diameter due to cooling tube is far smaller than the size of watering building body, therefore, the mode that supercharging is in the milk can be adopted to be in the milk, in back-grouting process, because back-grouting position is elongated, after its heat produced passes to and waters building body, heat radiation is very fast, and size is less simultaneously, avoids the generation of crackle.Method of the present invention is applicable to the grouting construction of ultra-large volume, for the grouting construction of ultra-large volume provides reference.
Cooling tube in described step (A) is zinc-plated bellows, or adopts coating steel pipe, arranges fin or projecting member at the external surface of coating steel pipe.Further, as present invention further optimization scheme, in order to improve the draw knot force watered between building body and cooling tube, avoiding producing gap between cooling tube surface and grouting body, zinc-plated bellows can be adopted as cooling tube, utilize the wave structure of bellows, the contact area increasing cooling tube and water between building body, changes Impact direction, by the stressed surperficial circular arc become along bellows of plane is stressed completely simultaneously, add drawknot dynamics, avoid the generation in gap; Also the coating steel pipe of band fin can be adopted, at common coating steel pipe external surface welding fin, fin is made to protrude from the frame mode on coating steel pipe surface, coating steel pipe can be increased and water and socket power between building body, avoid the crack that misplaces, the structure of fin can variation, can be circularly to be sleeved on coating steel pipe, also can be the sheet material of strip, also can be other shape.
In described step (B), when environment temperature is greater than 20 DEG C, mixture of ice and water is utilized to make grouting material as mixing water.Further, as another bright spot of the present invention, when the temperature of construction environment is greater than 20 DEG C, in order to reduce the temperature of grouting agent, aquation is reflected that the heat discharged leaves, can when mix slurrying, mixing water is replaced with part ice, the amount of 20% is approximately only had to be applicable to hydration reaction in mixing water, and remaining 80% all can evaporate and leave, therefore, utilize part ice cube to replace part water, first ice cube is ground into granule during use, then put into water and make mixture of ice and water, for stirring pulping, pulping material and water react, release heat, ice pellets absorbs heat and melts gradually, ice pellets after dissolving has absorbed a large amount of heats of hydration, evaporation is scattered and disappeared, and be melted into temperature in the process of water and do not raise, create a further reduction the temperature of watering building body inside.
In described step (D), improving the surface temperature of watering building body is utilize film thermal insulating, or film and Cover Gasket are incubated.Need when the temperature of the surroundings is low to adopt Insulation to keep building surface temperature, conventional film thermal insulating can be utilized, also can utilize the mode of film and Cover Gasket composite thermal insulation.
When adopting film thermal insulating, warm-air drier is utilized to control to build the temperature of surface.Further, if temperature is still very low, during lower than 2 DEG C, the heater means in the needs external world improves the surface temperature of watering building body, but, water building body and forbid heating before the forming, once spot heating, can directly cause the moisture evaporation rate of local too fast, hydration reaction does not complete, intensity is very low, result forms fluffy structure, or even dry sand grain, therefore, when heating, film thermal insulating must be used, keep its moisture simultaneously, and heating must be the contact of short time, all contacts, best mode is exactly with warm-air drier blowing hot-air discontinuously.
In described step (D), improving the surface temperature of watering building body is utilize hot water spray to be incubated.When building surface and being dry, the mode of heat water-spraying can be adopted keep and build surface temperature, to provide condition for hydration reaction.
The present invention compared with prior art, has following advantage and beneficial effect:
The casting method of a kind of concrete in mass of 1 the present invention, adopt cooling tube length with grouting body volume than the guide parameters of this parameter as cooling tube of arranging, if the use amount of cooling tube is inadequate, the heat-sinking capability of local so can be caused poor, be not easy to reduce temperature, do not reach the object overcoming heat radiation, if the quantity of cooling tube is on the high side, the length that pipe so can be caused to arrive increases, inner elbow increases, also cause the increase of grouting resistance simultaneously, be unfavorable for the construction of back-grouting, can when ensureing that the heat-sinking capability of cooling tube is suitable, reduce the difficulty of back-grouting, reduce the use amount of cooling tube simultaneously, reduce costs,
The casting method of a kind of concrete in mass of 2 the present invention, cooling water flows over interchange of heat and is discharged by unnecessary heat in cooling tube, reduce to water the temperature difference between building body inside and surface, in like manner, the method that raising also can be adopted to build surface temperature reduces to water the temperature difference between building body inside and surface, in some particular surroundings, the winter field construction of such as severe cold, just can adopt the method improving and build surface temperature;
The casting method of a kind of concrete in mass of 3 the present invention, adopt zinc-plated bellows as cooling tube, utilize the wave structure of bellows, the contact area increasing cooling tube and water between building body, change Impact direction simultaneously, by the stressed surperficial circular arc become along bellows of plane is stressed completely, adds drawknot dynamics, avoid the generation in gap; Also the coating steel pipe of band fin can be adopted, at common coating steel pipe external surface welding fin, fin is made to protrude from the frame mode on coating steel pipe surface, coating steel pipe can be increased and water and socket power between building body, avoid the crack that misplaces, the structure of fin can variation, can be circularly to be sleeved on coating steel pipe, also can be the sheet material of strip, also can be other shape;
The casting method of a kind of concrete in mass of 4 the present invention, utilize part ice cube to replace part water, during use, first ice cube is ground into granule, then put into water and make mixture of ice and water, for stirring pulping, pulping material and water react, and release heat, and ice pellets absorbs heat and melts gradually, ice pellets after dissolving has absorbed a large amount of heats of hydration, evaporation is scattered and disappeared, and is melted into temperature in the process of water and does not raise, and create a further reduction the temperature of watering building body inside.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
The casting method of a kind of concrete in mass of the present invention, is applied in the grouting construction in 800MN press main frame back-grouting hole, and the monolithic length in 800MN press main frame back-grouting hole is 13.6m, and width is 6.1m, and the gross area is 82.96m
2, floor grouting thickness be 0.3m, edge and center drilling part grouting thickness be 0.65m.The grouting scale of construction is as calculated about 30m
3, two pieces of bases are about 60m
3, calculate certain loss 5%, need back-grouting material 63m altogether
3, density of material 2200kg/m
3, then material usage is about 138.6 tons, is the foundation grouting of super large monomer.
(A) formwork: at 800MN press main frame back-grouting hole periphery formwork, in the region that thickness reaches 200mm, cooling tube is installed wherein, the import and export of cooling tube is connected with extraneous circulation pump, need cooling tube 300 meters altogether, adopt zinc-plated bellows as cooling tube, cooling tube distributing installation is in foundation ditch, simultaneously at grouting distribution in vivo mounting temperature sensor, temperature pick up is connected with Industrial Personal Computer (IPC), by the circulation pump of Industrial Personal Computer (IPC) controlled cooling model pipe, at foundation ditch other placement installation 40 warm-air driers;
(B) slurrying: the engineering time is June, temperature on average is up to 22 DEG C, and evening, temperature was low to moderate about 0 DEG C, therefore, adopt weight ratio be 40% mixture of ice and water carry out stirring pulping;
(C) build: utilize deadweight method grouting pouring construction, prohibit the use vibrating head during construction, wipe one's face before initial set, quadric-plastering, receipts light before final set;
(D) maintenance: when step (C) starts, the temperature of temperature pick up detection grouting body, when watering inside and surface temperature difference >=15 DEG C of building body, in cooling tube, pass into cooling water reduction water building body internal temperature, simultaneously, building surface covered with plastic film, night controls to build surface temperature with warm-air drier;
(E) secondary is built: after experiencing 3 day observation period, water in cooling tube is drained, be in the milk to cooling tube, utilize supercharging grouting, by grout pump, grouting agent is pressed into from openend, when grouting agent is emerged from exit, namely grouting complete, after being with its natural coagulation, cooling tube becomes a part of watering building body, is wiped out by unnecessary cooling tube.
Before building, utilize simulation software to emulate the ratio of the length of the cooling tube of different value with the volume of grouting body, the data obtaining coolant pump opening time length are as follows:
As can be seen from the above table, when the length of cooling tube and the numerical value of the ratio of the volume of grouting body are 4 time, substantially just need to open coolant pump by phased manner, namely cooling tube length now could meet the demand of heat radiation in other words, and when the length of cooling tube and the numerical value of the ratio of the volume of grouting body are about 8 time, heat transfer effect has reached ultimate attainment, the length increasing cooling tube again between the elementary period reducing coolant pump without too large effect, and now, the cooling tube increased adds manufacturing cost undoubtedly, therefore, the numerical value of the length of cooling tube and the ratio of the volume of grouting body is 4 to 12 time, comparatively suitable, as the ratio of the best, during employing 7 to 9, its operation is the easiest, the cost minimization of workload and cooling.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention, every according in technical spirit of the present invention to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.
Claims (6)
1. a casting method for concrete in mass, is characterized in that, comprises the following steps:
(A) formwork: formwork in the region of wanted grouting construction, installs cooling tube in the region that thickness reaches 200mm wherein, and the length of cooling tube is 4:1 ~ 12:1 with the ratio of the volume of grouting body, simultaneously at grouting distribution in vivo mounting temperature sensor;
(B) slurrying: utilize mixer that microdilatancy grouting material and water are mixed and made into grouting material;
(C) build: grouting material obtained for step (B) is poured in the mould shape of step (A), shaping;
(D) maintenance: when step (C) starts, the temperature of temperature pick up detection grouting body, when watering inside and surface temperature difference >=15 DEG C of building body, passing into cooling water reduction and watering building body internal temperature, or improving the surface temperature of watering building body in cooling tube;
(E) secondary is built: after step (D) experiences the observation period, drained by the water in cooling tube, and in cooling tube, build the grouting material that step (B) is obtained, cooling tube becomes a part of watering building body.
2. the casting method of a kind of concrete in mass according to claim 1, is characterized in that: the cooling tube in described step (A) is zinc-plated bellows, or adopts coating steel pipe, arranges fin or projecting member at the external surface of coating steel pipe.
3. the casting method of a kind of concrete in mass according to claim 1, is characterized in that: in described step (B), when environment temperature is greater than 20 DEG C, utilizes mixture of ice and water to make grouting material as mixing water.
4. the casting method of a kind of concrete in mass as claimed in any of claims 1 to 3, is characterized in that: in described step (D), and improving the surface temperature of watering building body is utilize film thermal insulating, or film and Cover Gasket are incubated.
5. according to the casting method of a kind of concrete in mass described in claim 4, it is characterized in that: when adopting film thermal insulating, utilize warm-air drier to control to build the temperature of surface.
6. the casting method of a kind of concrete in mass as claimed in any of claims 1 to 3, is characterized in that: in described step (D), and improving the surface temperature of watering building body is utilize hot water spray to be incubated.
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| CN201410576135.2A CN105525616A (en) | 2014-10-26 | 2014-10-26 | Massive concrete pouring method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547454A (en) * | 2018-03-21 | 2018-09-18 | 五冶集团上海有限公司 | Grouting material grout construction method under hot weather |
| CN109812034A (en) * | 2019-01-31 | 2019-05-28 | 青岛一建集团有限公司 | A kind of cooling for large volume casting concrete structural body, moisture retention construction method |
| CN109881900A (en) * | 2019-03-27 | 2019-06-14 | 中铁二十一局集团第五工程有限公司 | One kind is for concrete perfusion winter construction lagging facility in steel tube arch rib |
| CN110184935A (en) * | 2019-06-05 | 2019-08-30 | 中交武汉港湾工程设计研究院有限公司 | A kind of cooling device and its construction method for high tower cast-in-place concrete construction |
| CN112922005A (en) * | 2021-01-28 | 2021-06-08 | 延安大学 | Construction method of large-volume building foundation |
-
2014
- 2014-10-26 CN CN201410576135.2A patent/CN105525616A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547454A (en) * | 2018-03-21 | 2018-09-18 | 五冶集团上海有限公司 | Grouting material grout construction method under hot weather |
| CN109812034A (en) * | 2019-01-31 | 2019-05-28 | 青岛一建集团有限公司 | A kind of cooling for large volume casting concrete structural body, moisture retention construction method |
| CN109881900A (en) * | 2019-03-27 | 2019-06-14 | 中铁二十一局集团第五工程有限公司 | One kind is for concrete perfusion winter construction lagging facility in steel tube arch rib |
| CN110184935A (en) * | 2019-06-05 | 2019-08-30 | 中交武汉港湾工程设计研究院有限公司 | A kind of cooling device and its construction method for high tower cast-in-place concrete construction |
| CN112922005A (en) * | 2021-01-28 | 2021-06-08 | 延安大学 | Construction method of large-volume building foundation |
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