CN101929142A - Anti-seepage pressure reduction construction method of concrete dam body - Google Patents
Anti-seepage pressure reduction construction method of concrete dam body Download PDFInfo
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- CN101929142A CN101929142A CN200910067172XA CN200910067172A CN101929142A CN 101929142 A CN101929142 A CN 101929142A CN 200910067172X A CN200910067172X A CN 200910067172XA CN 200910067172 A CN200910067172 A CN 200910067172A CN 101929142 A CN101929142 A CN 101929142A
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Abstract
The invention discloses an anti-seepage pressure reduction construction method of a concrete dam body, belonging to the technical field of water conservancy and hydropower. The method comprises the following steps of mixing 42.5 stage dam portland cement slurry, wherein the weight ratio of water and cement is 0.6:1; adopting a technology that more than 3 wet grinders are in series connected to carry out fine grinding; ensuring that the particle grinding degree average particle size D50 reaches no more than 10 microns; wet grinding to prepare ultrafine cement slurry, wherein a slurry viscosity index is 31.12-34.05 s, a slurry proportion range is 1.72-1.74 g/cm<3>, and the slurry syneresis rate index volume ratio is 3-4.5 percent; and selecting larger grouting pressure. The invention has the advantages that, in the construction method, cement slurry particle fineness control, cement slurry water-cement ratio control, standard grouting finishing control, grouting pressure control and selection, design and making of a dam construction period uplift monitor device, a construction period safety monitor method as well as design and making of a special orifice sealer break the restrictions of a national conventional grouting construction method as well as national and industrial codes and standards.
Description
Technical field
The invention belongs to water conservancy, water power technical field, relate to a kind of improvement of dam body leakage maintaining method.
Background technology
After the water conservancy project dam builds up and comes into operation, runtime concrete dam body remote particularly, the aging and constructional deficiency of dam body itself can cause seepage in various degree, will cause dam dam body osmotic pressure to increase.Long-term seepage can cause the damage or the normal operation of influence of hydroelectric facility, has the danger of inrushing when serious.At present, generally adopt the grouting treatment technology to reduce the dam body osmotic pressure, but do not have the experience and the guiding technical data of moulding at home.
Summary of the invention
The objective of the invention is: a kind of anti-seepage pressure reduction construction method of concrete dam body is provided, and it has solved the anti-seepage pressure reduction construction problem efficiently and accurately.
Method of the present invention is:
1, cement grout grain fineness construction control
1) utilize homogenizer, mix 42.5 grades of dam portland cement slurries of system, water ash weight ratio is a water: ash=0.6: 1.The raw-material error in dipping control of slurrying is less than 5%, and solid phase material adopts the weight weighing method.
2) adopt homogenizer rotating speed greater than the 1200r/min running status under slurrying, mixing time is greater than 30s.
3) adopt 3 above wet milk series connection fine grinding process.After levigate 3 times, particle fine grinding degree average grain diameter (D50) guarantees to reach D50≤10 μ m.After levigate 3 times, with the existing equipment technical level, it is little that the average particulate diameter of slurries continues to improve the space.Referring to Fig. 1.
2, the cement grout Admixture selects for use and slurry specific gravity, viscosity, bleed rate construction control
1) wet-milling superfine cement slurries, the non-bleed type high efficiency water reducing agent of admixture cement weight 0.5%.
2) superfine cement slurries preparation adopts Marsh funnel to carry out viscosity measurements, adopts bydrostatic balance or gravity Baume meter to carry out than re-detection, adopts graduated cylinder to carry out the bleed rate and detects.
3) slurry specific gravity scope: 1.72～1.74g/cm
3Between; The proportion of slurry specific gravity and (0.6: 1 slurries is 1.73g/cm3) standard proportioning of calculating according to the absolute volume principle is identical substantially.
4) slurry viscosity index: between 31.12～34.05s; Slurry viscosity Marsh funnel test value fundamental sum Marsh funnel rough surface test slurry viscosity reference value (32s) unanimity; And satisfy practical experience: Marsh funnel slurry viscosity test should be lower than 50s, should be with 28～38s for well.
5) slurries bleed rate index: between 3%～4.5% (volume ratio); Satisfy " hydraulic structure cementation construction technique normalizing " (DL/T5148-2001) requirement of 5.1.5 bar about stable slurry (2h bleed rate is not more than 5%).
3, the construction control of grouting pressure
1) usually according to the dam body height (hydrostatic level before the dam: h) 2.5～3.0 times hydrostatic pressure, tentatively choose grouting pressure.Lift the safety limit of observation and dam body dam crest, upstream face deformation monitoring at dam body: monitoring on the basis of requirement in the safety limit value of lifting≤0.2mm limit difference, is the lifting amplitude with 0.2MPa, strengthens grouting pressure as far as possible, chooses bigger grouting pressure.
2) dam body lifts the monitoring device mounting arrangements referring to Fig. 2.
3) dam facing crack deformation monitoring during the water conservancy project dam grouting
Water conservancy project dam dam crest crack deformation monitoring is arranged referring to Fig. 3,4;
Measure each monolith construction period fracture opening by BGK-4420 type slit gauge: in the type vibration wire sensing element is arranged, connecting rod is pulled out from apparatus subject, spring is elongated and causes tension force to increase and measured by the vibratory string sensing element.Tension force on the string wire is direct and be drawn into ratio, and the folding degree of seam is measured STRESS VARIATION by the vibratory string readout instrument and accurately measured.
The invention has the beneficial effects as follows: above a whole set of job practices of water conservancy project dam body step-down curtain grouting, being the applicant implements antiseepage, falls the summary that the successful case of oozing engineering is carried out according to domestic water conservancy project concrete dam dam body, be at the water conservancy project seepage control of dam, fall a whole set of grout construction method that oozes the engineering design purpose and carry out, each construction control key element interknits in the method, and is indispensable.In this job practices, cement grout grain fineness control, the control of cement grout water/binder ratio, the control of grouting ending standard, grouting pressure control and selection, dam construction phase lift designing and producing of the designing and producing of monitoring device, construction period safety monitoring method, dedicated ports sealer, broken through the restriction of domestic conventional grouting worker's method and country, industry standard standard, for domestic grouting construction field initiative and in the plentiful dam overflow monolith antiseepage of Fujian Shui Dong dam and Jilin with fall and ooze successful implementation in the engineering construction.After being in the milk according to this job practices, anti-blend to fall ooze the curtain engineering construction quality and all reached designing requirement, superior in quality.
Description of drawings
Fig. 1 is wet-milling number of times and the corresponding curve map of particle diameter (D50)
Fig. 2 be wet-milling slurrying with the grouting site plant between work and be connected and arrange schematic diagram;
Fig. 3 is that dam body lifts the monitoring device fitting arrangement;
Fig. 4 is a dam body external crack measuring apparatus operating principle schematic diagram;
Fig. 5 is a BGK-4420 type slit gauge scheme of installation;
Fig. 6 is an electrical measurement inclinator scheme of installation;
Fig. 7 is a dedicated ports sealer fundamental diagram.
The specific embodiment
Shown in Figure 2, the 21st, the overfall valve, the 22nd, mix the slurry feed pipe, the 23rd, cement, the 24th, homogenizer, the 25th, wet milk, the 26th, low-speed mixer, the 27th, grouting pump, the 28th, slip casting plug.
Shown in Figure 3, the 31st, interior pipe, the 32nd, dial gauge, the 33rd, outer tube, the 34th, support, the 35th, concrete pier, the 36th, monitored rock mass or dam body, the 37th, fine sand separation layer in the middle of the inner and outer pipes, the 38th, gypsum grease seal separation layer, the 39th, interior pipe anchoring section.
Shown in Figure 4, the 41st, instrument lead, the 42nd, coil and thermometer, the 43rd, universal ball joint, the 44th, sleeve pipe (protection tube), the 45th, transmit bar, the 46th, set bolt A, the 47th, universal ball joint, the 48th, locating slot, the 49th, alignment pin, the 410th, set bolt B.
Shown in Figure 5, the 51st, the crack, the 52nd, expansion bolt is A fixedly, and the 53rd, expansion bolt is B fixedly.
Shown in Figure 6, the 61st, wall or side slope, the 62nd, fixed support, the 63rd, balancing controls, the 64th, clinometer.
Shown in Figure 7, the 71st, geological drilling rig, the 72nd, inlet pipe, the 73rd, the aperture sealer, the 74th, pressure meter, the 75th, pressure sensor, the 76th, return pipe, the 77th, the overfall valve, the 78th, overfall stream, the 79th, orifice tube, the 710th, advance slurry stream, the 711st, dam body or rock mass.
1, cement grout grain fineness construction control
1) utilize homogenizer, mix 42.5 grades of dam portland cement slurries of system, water ash weight ratio is a water: ash=0.6: 1.The raw-material error in dipping control of slurrying is less than 5%, and solid phase material adopts the weight weighing method.
2) adopt homogenizer rotating speed greater than the 1200r/min running status under slurrying, mixing time is greater than 30s.
3) adopt 3 above wet milk series connection fine grinding process.After levigate 3 times, particle fine grinding degree average grain diameter (D50) guarantees to reach D50≤10 μ m.After levigate 3 times, with the existing equipment technical level, it is little that the average particulate diameter of slurries continues to improve the space.Referring to Fig. 1.
2, the cement grout Admixture selects for use and slurry specific gravity, viscosity, bleed rate construction control
1) wet-milling superfine cement slurries, the non-bleed type high efficiency water reducing agent of admixture cement weight 0.5%.
2) superfine cement slurries preparation adopts Marsh funnel to carry out viscosity measurements, adopts bydrostatic balance or gravity Baume meter to carry out than re-detection, adopts graduated cylinder to carry out the bleed rate and detects.
3) slurry specific gravity scope: 1.72～1.74g/cm
3Between; The proportion of slurry specific gravity and (0.6: 1 slurries is 1.73g/cm3) standard proportioning of calculating according to the absolute volume principle is identical substantially.
4) slurry viscosity index: between 31.12～34.05s; Slurry viscosity Marsh funnel test value fundamental sum Marsh funnel rough surface test slurry viscosity reference value (32s) unanimity; And satisfy practical experience: Marsh funnel slurry viscosity test should be lower than 50s, should be with 28～38s for well.
5) slurries bleed rate index: between 3%～4.5% (volume ratio); Satisfy " hydraulic structure cementation construction technique normalizing " (DL/T5148-2001) requirement of 5.1.5 bar about stable slurry (2h bleed rate is not more than 5%).
3, the construction control of grouting pressure
1) usually according to the dam body height (hydrostatic level before the dam: h) 2.5～3.0 times hydrostatic pressure, tentatively choose grouting pressure.Lift the safety limit of observation and dam body dam crest, upstream face deformation monitoring at dam body: monitoring on the basis of requirement in the safety limit value of lifting≤0.2mm limit difference, is the lifting amplitude with 0.2MPa, strengthens grouting pressure as far as possible, chooses bigger grouting pressure.
2) dam body lifts the monitoring device mounting arrangements referring to Fig. 3;
3) dam facing crack deformation monitoring during the water conservancy project dam grouting
Water conservancy project dam dam crest crack deformation monitoring is arranged referring to Fig. 4～5;
Measure each monolith construction period fracture opening by BGK-4420 type slit gauge: in the type vibration wire sensing element is arranged, connecting rod is pulled out from apparatus subject, spring is elongated and causes tension force to increase and measured by the vibratory string sensing element.Tension force on the string wire is direct and be drawn into ratio, and the folding degree of seam is measured STRESS VARIATION by the vibratory string readout instrument and accurately measured; As Fig. 4.
5) water conservancy project dam grouting construction period upstream face deformation monitoring
Utilize the tilt variation of the long-term Measurement of Dam structure of 6350 type vibration wire inclinometers of basic health instrument, comprise dam, basis, retaining wall and analog structure, basic principle is to utilize to be installed in monitored structural inclination sensor and accurately to measure gradient, as Fig. 6.
Claims (1)
1. anti-seepage pressure reduction construction method of concrete dam body, its method is:
A, utilize homogenizer, mix 42.5 grades of dam portland cement slurries of system, water ash weight ratio is a water: ash=0.6: 1, and the raw-material error in dipping control of slurrying is less than 5%, and solid phase material adopts the weight weighing method;
B, adopt homogenizer rotating speed greater than the 1200r/min running status under slurrying, mixing time is greater than 30s;
C, 3 above wet milks series connection fine grinding process of employing; After levigate 3 times, particle fine grinding degree average grain diameter guarantees to reach D50≤10 μ m;
D, wet-milling superfine cement slurries, the non-bleed type high efficiency water reducing agent of admixture cement weight 0.5%;
E, the preparation of superfine cement slurries adopt Marsh funnel to carry out viscosity measurements, and the slurry viscosity index is between 31.12～34.05s; Adopt bydrostatic balance or gravity Baume meter to carry out than re-detection, the slurry specific gravity scope is at 1.72～1.74g/cm
3Between; Adopt graduated cylinder to carry out the bleed rate and detect, slurries bleed rate index volume ratio is between 3%～4.5%;
F, according to the hydrostatic pressure of 2.5～3.0 times of dam body height, tentatively choose grouting pressure; Lifting the safety limit of observation and dam body dam crest, upstream face deformation monitoring at dam body, monitor on the basis of requirement in the safety limit value of lifting≤0.2mm limit difference, is the lifting amplitude with 0.2MPa, strengthens grouting pressure as far as possible, chooses bigger grouting pressure.
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| CN200910067172XA CN101929142A (en) | 2009-06-26 | 2009-06-26 | Anti-seepage pressure reduction construction method of concrete dam body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350389A (en) * | 2011-07-20 | 2012-02-15 | 河南理工大学 | Explosion-proof ultrafine cement wet grinder for mining |
| CN102436722A (en) * | 2011-12-05 | 2012-05-02 | 中国水利水电科学研究院 | Temperature control and crack prevention monitoring method of concrete dam |
| CN102854302A (en) * | 2012-08-24 | 2013-01-02 | 河海大学 | Testing device and method for real-time measurement of cracking time and crack width of concrete at early age |
-
2009
- 2009-06-26 CN CN200910067172XA patent/CN101929142A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350389A (en) * | 2011-07-20 | 2012-02-15 | 河南理工大学 | Explosion-proof ultrafine cement wet grinder for mining |
| CN102436722A (en) * | 2011-12-05 | 2012-05-02 | 中国水利水电科学研究院 | Temperature control and crack prevention monitoring method of concrete dam |
| CN102436722B (en) * | 2011-12-05 | 2014-03-12 | 中国水利水电科学研究院 | Temperature control and crack prevention monitoring method of concrete dam |
| CN102854302A (en) * | 2012-08-24 | 2013-01-02 | 河海大学 | Testing device and method for real-time measurement of cracking time and crack width of concrete at early age |
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Application publication date: 20101229 |