CN1106877A - Job practice of arch dam of roller-compacted concrete - Google Patents
Job practice of arch dam of roller-compacted concrete Download PDFInfo
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- CN1106877A CN1106877A CN 94115806 CN94115806A CN1106877A CN 1106877 A CN1106877 A CN 1106877A CN 94115806 CN94115806 CN 94115806 CN 94115806 A CN94115806 A CN 94115806A CN 1106877 A CN1106877 A CN 1106877A
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Abstract
The said job practice combines conventional concrete rolling process with new construction technology including the application of interlayer cement mortar to increasing combining force, the aggregate separation preventing techn, the alternate spreading and vibrating of different concrete to result in excellent combination and the concrete denaturing process by adding mortar. The said job practice in conjunction with the use of special adjustable formwork can construct high dam.
Description
The present invention relates to a kind of job practices of concrete dam, relating in particular to the full section of a kind of dam body is the job practices that rolled concrete is built high arch dam.
At present, when rolled concrete is built dam, because rolled concrete interlayer adhesion is poor, the side easily produces voids and pits, seepage very easily, quality does not pass a test, so, the methods that adopt " golden contracted payment " more, be that rolled concrete is only built in the dam body middle part, and the concrete of upstream face and exposed parts is then used conventional plastic concrete, rolled concrete is wrapped up in it, this job practices is not only invested greatly, and normality plastic concrete construction is slow far beyond the rolled concrete speed of application, and it is big to take the labour, uneconomical, the combination of these two kinds of concretes and often because of itself expansion in addition, the difference of shrinkage factor very easily produces the crack with the passage of time at the contact place, weight person can have a strong impact on the safety of works, the lighter's slip casting of need doing over again is handled and to be built, and forms a kind of hidden danger; In addition in the junction of dam two ends and batholith, and a small amount of reinforcing bar position arranged in the dam body, gallery periphery in the dam body, with some corner, counter-slope position job practices routinely also all is to do earlier to make bed course greater than the normality plastic concrete of 20-70cm outside these positions, remaking rolled concrete then engages, same similar to the result of above-mentioned " golden contracted payment ", existence is taken a lot of work, take material, speed is slow, the problem that joint easily cracks, this shows with conventional at present job practices when building dam, speed is slow, of poor quality, investment has become a big disadvantage greatly, and is extremely to be solved.
The objective of the invention is to realize that with the new method that conventional rolled concrete construction method combines with some new construction technology operations the full section of arch dam is the high arch dam building of rolled concrete.This method exempted upstream face a large amount of plastic concretes building or add the anti-coating of mixing of spray at the whole upstream face of dam body, and economize except many around gallery, the building of normality plastic concrete at positions such as a small amount of reinforcing bar, counter-slope arranged, thereby simplified whole building operation, save a large amount of steel, cement and accelerated the progress that whole dam is built, and improve its quality greatly, thereby have huge technology, economic and social benefit.
Main point of the present invention is:
1, strictness standardize in accordance with regulations selection, proportioning, mix and stir, the production rolled concrete, and class Three goes out machine Vc value by what storehouse interview tested that the inspector controls the concrete batching plant, generally Vc is 5-12 second, and is strong in Exposure to Sunlight, Vc was 4-7 second when wind speed was big, Vc is 12-20 second when light rain;
2, the rolled concrete interlayer overlays special 2-3mm compo layer, and it can play firm interlayer combination;
3, between the normality plastic concrete of dam body and two ends batholith employing intersect in proper order spread out and put on, dither deeply vibrates technical operation, makes the xenogenesis concrete have good binding;
4, have around a small amount of reinforcing bar position, the gallery, corner or counter-slope position adopt and all spread the rolled concrete material at its position, and spills the abnormal concrete technical role of shop 2-3mm compo in its paving, replaces original two kinds of different in nature concrete combinations;
5, with preventing that Segregation from taking up the way of disperseing the aggregate dead band in two templates, overcomes dam body side voids and pits.
New method through foregoing invention, high arch dam building speed is improved greatly, building materials reduce quality in a large number and greatly improve, make the construction of water conservancy arch dam set foot on a new mileage, it is good with cycle weak point, small investment, quality, greatly improves advantage such as labor strength and conventional dam construction technology phase shape is seen clumsy.The Puding dam in China Guizhou Province is high 75 meters, in the world today in the dam of building of the same type, be exactly to build, and go through test in 2 year flood season with the method, confirm that its quality is perfect, its construction period is then than shortening greatly in the past.
Be described in detail as follows below with regard to job practice of arch dam of roller-compacted concrete:
A kind of job practice of arch dam of roller-compacted concrete, comprise in accordance with regulations select materials, prepare burden, mix and stir, stone, vibroroller cmpacting, it is characterized in that:
(1) preparation rolled concrete
1, in the material selection
1. the fineness of flyash should be less than 8%, and loss on ignition is less than 12%,
2. rubble proportioning; In in the secondary stone, the gravelstone ratio is 50: 50, three grades of large, medium and small ratios of stone are 40: 30: 30,
3. the fineness of sand is 2.8 ± 0.2, and wherein content of stone powder is 12-17%,
4. sand water content.Sand＜6%.
2, roller compacted concrete cooperates two kinds of scores, and is a kind of for R90-200 is used for 3 meters thick places of upstream face, and another kind of for R90-150 is used for other everywhere, its prescription is:
Unit materials consumption Kg/ cubic meter
3, the control batching plant goes out the Vc value of machine.
Vc is 5-12 second, and wherein wind speed is big, Vc was 4-7 second when Exposure to Sunlight was strong, and Vc is 12-20 second during the light rain construction.
(2) dam body rolled concrete construction
1, the concrete that paves
(1) will prepare concrete with automobile by 2 or multipoint mode discharging,
(2) apart from not allowing discharging in the template 30cm, and auxiliary aggregate is disperseed, and will be scattered in along the aggregate that the edge separates on the stone roller face with artificial,
(3) push with the machine secondary of closing a position, making every layer of stone is 35cm.
2, roll with the vibrating roller press and roll, concentrated or expose until the no aggregate in rolled concrete surface, the concrete surface layer has the general dew of little slurry, and to roll the unit weight amount be 2400/ kilogram/cubic meter, and bed thickness is 30cm,
3, interlayer adds shop slurry back-up coat
(1) roll the thick special compo layer of the overlay one deck 2-3mm of elder generation on the paving, back at every layer, and then repeat to lay second layer rolled concrete,
(2) above-mentioned compo layer formula is identical with rolled concrete, and venerate the water ash and dwindle 0.03-0.05 than rolled concrete, the little 10%-15% of doping quantity of fly ash, the Admixture consumption reduces 1/4-1/3.
(3) dam body engages the operation technique that vibrates of xenogenesis concrete with two batholiths
1, the plastics concrete that must make 70-100cm at the batholith place is made bed course
2, the plastic concrete layer of rolled concrete layer and batholith intersects rising in order, and builds rolled concrete earlier, then, promptly makes plastic concrete, and plastics concrete layer is a little less than the rolled concrete layer, and both lap length are 2-3 rice in spreading out and putting on, and the gradient of lap-joint's rolling layers is 1: 4,
3, vibrate
With the high frequency immersion vibrator earlier according to basement rock successively in the storehouse direction vibrate, must be inserted into when vibrating the concrete 5cm of lower floor with guarantee concrete melt mix closely knit,
(4) gallery periphery, corner, the counter-slope on dam or the different in nature concrete work technology at a small amount of concrete position is arranged
1, directly spreads out and puts at above-mentioned position with rolled concrete, before spreading out and putting on, spill shop 2-3mm compo earlier, spill shop one deck compo again at its surface layer behind the stone, the batching of compo is with rolled concrete compo that interlayer adds, and its consumption is the 4-5% of total sex change concrete cumulative volume.
2, vibrate
Carry out the ram-jolt operation with the high frequency immersion vibrator.
The operation of foregoing invention, practical application through the Puding dam on tributary, the Wujiang River, Chinese Guizhou Province all confirms its high-quality with the test in flood season second phase and the sampling analysis of thousand, hundred different parts, parameters such as its compacted density, compressive strength have all reached world-class levels, and its index is: concrete grade compacted density Kg/ cubic meter intensity MPa
R90-200 2444-2570 31-42
R90-150 2428-2590 34.3-61.2
The present invention is in practice of construction, except above-mentioned measure, also adopted a kind of rolled concrete to build with special-purpose large-scale steel form, this kind template is a modular construction, because the junction has adjustable for height connector, therefore it can make support and the template that fuses can be low-angle inclination, and easy accessibility, thereby make ten days form removals of original needs, cleaning, the work that refills now only needs continuously with getting final product, so not only improved operating efficiency greatly, and the tiltable of template has solved on the dam, the difficult problem of the curved surface that heads in downstream construction and exempted time and investment that circular formwork is made.For efficient, fast, high-quality is built a dam that good equipment is provided.
Description of drawings:
Fig. 1 is the Puding dam overall schematic with the present invention's construction;
Fig. 2 is that the xenogenesis concrete is in conjunction with construction technology operation schematic diagram;
Fig. 3 is the adjustable steel form overall structure of a cantilevered schematic diagram;
Fig. 4 is the structural representation of tunable component third among Fig. 1;
Fig. 5 is the demolding structure second structural representation of template among Fig. 1;
Fig. 6 is the structural representation of the demolding structure first of template among Fig. 1;
Fig. 7 is a structural representation of regulating bolt among Fig. 3.
By shown in Fig. 3-7 as seen.
A kind of concrete is poured into a mould special use, can be loaded and unloaded large steel moulding plate fast, form by angle vertical rod 1, vertical rod 2, upper and lower cross bar 3, middle transverse rod 5 and 4,6 of hounds, above-mentioned all bars of (see figure 3) are angle steel, and the intersection point of each bar is provided with one and strengthens with junction plate 18 or 19, it is characterized in that at vertical rod 2 connectors 17 places, be provided with 27 screw rods 28 that two ends are threaded, the centre is adjusting nut by having of screwed plug connector 27, two connectors it is become adjustable for height connection (see figure 4); Be provided with two chucks 11 that have pin-and-hole at vertical rod 1 upper end, lower end is provided with a plug 12 that has a pin-and-hole, and the thickness of plug 12 equates (see figure 5) with two chucks, 11 interbody spacers, during combination, the plug 22 of last steel form inserts between two chucks of following steel form, and links with the pin hand-hole; Be provided with two demouldings bolt 13 on mobile jib 1, bolt 13 1 ends are square folder, and the other end stretches in the template, and its top is provided with the internal thread (see figure 6) that is screwed with the bolt that is fixed in the concrete.
The said structure template was both detachable, assembling, can make punching block vertical rod 2 place's alterable heights with turning of screw rod 28 again, was certain inclination thereby support bar 6 drive steel forms move.Through the use of building a dam of Puding dam, this steel form can replace rising continuously, the adjustable tilt degree, and convenient disassembly uses reliably, and accurate positioning can be shortened the construction period greatly.
Claims (4)
- A kind of job practice of arch dam of roller-compacted concrete, comprise in accordance with regulations select materials, prepare burden, mix and stir, stone, vibroroller cmpacting, it is characterized in that:(1) preparation rolled concrete1, in the material selection1. the fineness of flyash should be less than 8%, and loss on ignition is less than 12%,2. rubble proportioning; In in the secondary stone, the gravelstone ratio is 50: 50, three grades of large, medium and small ratios of stone are 40: 30: 30,3. the fineness of sand is 2.8 ± 0.2, and wherein content of stone powder is 12-17%,4. sand water content.Sand＜6%.2, roller compacted concrete cooperates two kinds of scores, and is a kind of for R90-200 is used for 3 meters thick places of upstream face, and another kind of for R90-150 is used for other everywhere, its prescription is:
3, the control batching plant goes out the Vc value of machine.Vc is 5-12 second, and wherein wind speed is big, Vc was 4-7 second when Exposure to Sunlight was strong, and Vc is 12-20 second during the light rain construction. - (2) dam body rolled concrete construction1, the concrete that paves(1) will prepare concrete with automobile by 2 or multipoint mode discharging,(2) apart from not allowing discharging in the template 30cm, and help with artificial shop aggregate disperseed, and will be scattered in along the aggregate that separate on the limit on the stone roller face,(3) push with the machine secondary of closing a position, making every layer of stone is 35cm2, roll with the vibrating roller press and roll, concentrated or expose until the no aggregate in rolled concrete surface, the concrete surface layer has the general dew of little slurry, and to roll the unit weight amount be 2400/ kilogram/cubic meter, and bed thickness is 30cm,3, interlayer adds shop slurry back-up coat(1) roll the thick special compo layer of the overlay one deck 2-3mm of elder generation on the paving, back at every layer, and then repeat to lay second layer rolled concrete,(2) the identical ， Only with rolled concrete of above-mentioned compo layer formula is that the water ash dwindles 0.03-0.05 than rolled concrete, the little 10%-15% of doping quantity of fly ash, and the Admixture consumption reduces 1/4-1/3.
- (3) dam body engages the operation technique that vibrates of xenogenesis concrete with two batholiths1, makes bed course at the plastics concrete of batholith exterior palpi making 70-100cm2, the plastic concrete layer of rolled concrete layer and batholith intersects rising in order, and builds rolled concrete earlier, then promptly makes plastic concrete, and plastics concrete layer is a little less than the rolled concrete layer, and both lap length are 2-3 rice in spreading out and putting on, and the gradient of lap-joint's rolling layers is 1:4,3, vibrateWith the high frequency immersion vibrator earlier according to basement rock successively in the storehouse direction vibrate, must be inserted into when vibrating the concrete 5cm of lower floor with guarantee concrete melt mix closely knit,
- (4) gallery periphery, corner, the counter-slope on dam or the different in nature concrete work technology at a small amount of concrete position is arranged1, directly spreads out and puts at above-mentioned position with rolled concrete, before spreading out and putting on, spill shop 2-3mm compo earlier, spill shop one deck compo again at its surface layer behind the stone, the batching of compo is with rolled concrete compo that interlayer adds, and its consumption is the 4-5% of total sex change concrete cumulative volume.2, vibrateCarry out the ram-jolt operation with the high frequency immersion vibrator.2, by the described job practice of arch dam of roller-compacted concrete of claim 1, steel form used when it is characterized in that making arch dam is special-purpose steel form.3, a kind of special-purpose steel template of building rolled concrete is made up of angle vertical rod (1), vertical rod (2), upper and lower cross bar (3), middle transverse rod (5) and hound (4), (6), above-mentioned all bars are angle steel, and the intersection point of each bar is provided with one and strengthens with junction plate (18) or (19), it is characterized in that locating at vertical rod (2) connector (17), be provided with a screwed plug connector (27), the screw rod (28) that two ends are threaded by having between two connectors (27), the centre is adjusting nut becomes adjustable for height connection with it; Be provided with two chucks (11) that have pin-and-hole at vertical rod (1) upper end, lower end is provided with a plug (12) that has a pin-and-hole, the thickness of plug (12) equates with two chucks (11) interbody spacer, during combination, the plug of last steel form (22) inserts between two chucks of following steel form, and links with the pin hand-hole; Be provided with two demouldings bolt (13) on mobile jib (1), bolt (13) one ends are square folder, and the other end stretches in the template, and its top is provided with the internal thread that is screwed with the bolt that is fixed in the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94115806 CN1106877A (en) | 1994-08-30 | 1994-08-30 | Job practice of arch dam of roller-compacted concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94115806 CN1106877A (en) | 1994-08-30 | 1994-08-30 | Job practice of arch dam of roller-compacted concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1106877A true CN1106877A (en) | 1995-08-16 |
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|---|---|---|---|
| CN 94115806 Pending CN1106877A (en) | 1994-08-30 | 1994-08-30 | Job practice of arch dam of roller-compacted concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074803C (en) * | 1998-12-11 | 2001-11-14 | 湖北省电力勘测设计院 | Technology for building dam by flyash mixed high strength and waterproof soil solidifying agent |
| CN100465380C (en) * | 2002-08-11 | 2009-03-04 | 张文 | Bottle stopper type anti-shock dam |
| CN103485312A (en) * | 2013-09-18 | 2014-01-01 | 中国水电顾问集团贵阳勘测设计研究院 | Construction technology for converging compacted concrete dam and riverbed foundation surface |
| CN107746223A (en) * | 2017-10-19 | 2018-03-02 | 广东水电二局股份有限公司 | A kind of RCCD and its construction method |
| CN115369823A (en) * | 2022-08-22 | 2022-11-22 | 中国水利水电第十一工程局有限公司 | Roller compacted concrete interlayer surface treatment method |
-
1994
- 1994-08-30 CN CN 94115806 patent/CN1106877A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074803C (en) * | 1998-12-11 | 2001-11-14 | 湖北省电力勘测设计院 | Technology for building dam by flyash mixed high strength and waterproof soil solidifying agent |
| CN100465380C (en) * | 2002-08-11 | 2009-03-04 | 张文 | Bottle stopper type anti-shock dam |
| CN103485312A (en) * | 2013-09-18 | 2014-01-01 | 中国水电顾问集团贵阳勘测设计研究院 | Construction technology for converging compacted concrete dam and riverbed foundation surface |
| CN103485312B (en) * | 2013-09-18 | 2015-07-22 | 中国水电顾问集团贵阳勘测设计研究院 | Construction technology for converging compacted concrete dam and riverbed foundation surface |
| CN107746223A (en) * | 2017-10-19 | 2018-03-02 | 广东水电二局股份有限公司 | A kind of RCCD and its construction method |
| CN107746223B (en) * | 2017-10-19 | 2020-03-24 | 广东水电二局股份有限公司 | Roller compacted concrete dam and construction method thereof |
| CN115369823A (en) * | 2022-08-22 | 2022-11-22 | 中国水利水电第十一工程局有限公司 | Roller compacted concrete interlayer surface treatment method |
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