CN102912773B - Volute casing protecting method in hydropower station expansion construction - Google Patents
Volute casing protecting method in hydropower station expansion construction Download PDFInfo
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- CN102912773B CN102912773B CN201210432533.8A CN201210432533A CN102912773B CN 102912773 B CN102912773 B CN 102912773B CN 201210432533 A CN201210432533 A CN 201210432533A CN 102912773 B CN102912773 B CN 102912773B
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- spiral case
- gypsum
- hydropower station
- volute casing
- water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention relates to a volute casing protecting method in the hydropower station expansion construction. The invention is to provide the volute casing protecting method in the hydropower station expansion construction, so as to avoid deformation of a volute casing and guarantee that no influence on the material performance of the volute casing is caused. According to the invention, a technical scheme is as follows: the method comprises the following steps of: (a) closing a water inlet valve and a guide vane of the volute casing, so that a sealed and watertight cavity is formed in the volute casing; arranging a slurry inlet pipe and a gas outlet pipe, wherein one ends of the slurry inlet pipe and the gas outlet pipe extend into the volute casing; (b) injecting gypsum slurry into the volute casing through the slurry inlet pipe; (c) after the gypsum slurry is solidified, implementing the hydropower station expansion construction; and (d) after the hydropower station expansion construction is finished, spraying water into the volute casing; after the water absorbing strength of the gypsum inside the volute casing is reduced, excavating and recycling the gypsum; only leaving a gypsum layer on the inner wall of the volute casing as a protective layer; and finally, washing the residual gypsum by using water, so that the gypsum completely falls off. The volute casing protecting method in the hydropower station expansion construction, provided by the invention, is suitable for reinforcing and protecting the hydropower station volute casing in the hydropower station expansion construction and can be also used for protecting other empty cavities.
Description
Technical field
The present invention relates to the spiral case guard method in a kind of hydropower station expansion construction; mainly be applicable to reinforce power station spiral case in power station expansion machine and protect; make spiral case not because of adjacent regions (machine pier, fan housing) steel concrete remove/newly-built and be affected, also can be used for the protection of other cavity body (cavity body that especially various Irregular Boundary Surface is formed).
Background technology
In some hydropower station expansion process, need to maintain original spiral case and (part) spiral case external wrapping concrete present situation, and only machine pier, fan housing structure and relevant device are replaced.In the steel concrete demolishing process to original machine pier, fan housing structure, if do not carry out consolidation process to spiral case, under the External Force Acting exceeding external wrapping concrete ability to bear and spiral case self-strength, spiral case body generally can be made to produce distortion and affect use.
Spiral case is reinforced; act on the external force on spiral case top; mainly contain the impact force of construction machinery; and newly water the weight of large-sized unit of machine pier, fan housing weight concrete and renewal; generally adopting the scheme that welded steel structure supports or jack supports in steel spiral case at present, by forming rod member supporting way in spiral case, spiral case being protected.The intensity of limited supporting rod, can retrain the external force on spiral case top, namely limits the condition of work of top construction machinery.Simultaneously due to the particularity of spiral case cavity shape, supporting rod is generally inconvenient to arrange, when supporting rod is arranged sparse, easily makes spiral case stress concentrate, spiral case distortion occurs time serious.In addition, welding supports and removes cutting off in support process, polishing all can produce certain adverse effect to the material property of spiral case.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of convenient and quick construction, to the spiral case guard method in the high hydropower station expansion construction of mechanical impact force compliance in construction for above-mentioned Problems existing; give spiral case to support preferably; avoid spiral case to deform to reach, ensure the impregnable object of spiral case material property.
The technical solution adopted in the present invention is: the spiral case guard method in hydropower station expansion construction, is characterized in that step is as follows:
A, the water intaking valve of closing spiral case and stator, make spiral case inside form the watertight cavity of a sealing, arrange that inlet pipe and the escape pipe of spiral case inside are stretched in one end simultaneously;
B, in spiral case, inject gypsum slurries by inlet pipe, until slurries are full of whole spiral case;
C, after gypsum slurries solidifies, carry out hydropower station expansion construction;
After d, hydropower station expansion construction complete, spray water in spiral case, after the gypsum injection index of its inside reduces, gypsum is excavated and reclaims, only stay one deck gypsum on spiral case inwall as topping, finally with water residual gypsum washed away and make it come off completely;
The not expanding gypsum powder that after described gypsum slurries adopts crystallization, intensity index is identical or close with spiral case external wrapping concrete intensity is made.
The water inlet end of described spiral case is provided with interim plug, and described inlet pipe and escape pipe are arranged on this plug.
After each parts have been arranged in step a, checked the sealing of spiral case by inlet pipe to water filling in spiral case, its test stone is, after being full of water in spiral case, and only escape pipe water outlet.
Inject gypsum slurries in spiral case before, the equipment that may flow through after flowing out slurries carries out covering protection.
In described steps d, drainage collection is carried out to the waste water obtained after flush clean.
The invention has the beneficial effects as follows: 1, to filler plaster slurries in airtight spiral case; after slurries crystallization and freezing; fully contact with spiral case inside; the support that spiral case is enough is given from inside; in conjunction with external wrapping concrete, spiral case is protected simultaneously; reduce the impact of expansion machine construction on spiral case as much as possible; improve spiral case to the mechanical impact force adaptive capacity in construction; effectively prevent the distortion of spiral case; ensure that its stability, solve normal welding tubing support cause spiral case stress concentrate, yielding problem.2, select high strength gypsum as inserts, gypsum slurries is adopted during filling, be easy to fill, after the construction of expansion machine, the gypsum of solidification is sprayed water, the mode of " machinery excavate+water under high pressure wash away " is adopted to remove gypsum, not only convenient and swift, and ensure that spiral case material property is unaffected.3, the gypsum sets time is short, generates crystal intensity high, not only ensure that the protected effect to spiral case, and save the duration.
Accompanying drawing explanation
Fig. 1 is floor map of the present invention.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Detailed description of the invention
As shown in Figure 1 and Figure 2, the present embodiment Specific construction step is as follows:
A, be form obturator in spiral case 5, spiral case 5 inside need be made to form confined air cavity; First water intaking valve and the stator 6 of spiral case 5 is closed, spiral case 5 inside is made to form the watertight cavity of a sealing, arrange that inlet pipe 3 and escape pipe 4(double as outlet pipe simultaneously and use simultaneously), it is inner that spiral case 5 is stretched in described inlet pipe 3 and escape pipe 4 one end, and it is outside that the other end is positioned at spiral case 5.If the straight length between water intaking valve and spiral case 5 is long, at the water inlet end of spiral case 5, interim plug 1 can be installed, with stator 6 acting in conjunction of closing, spiral case 5 be sealed, now, described inlet pipe 3 and escape pipe 4 are arranged on this plug.
After layout completes, by checking the sealing of spiral case 5 to water filling in spiral case 5, namely pass through inlet pipe 3 to water filling in spiral case 5, escape pipe 4 is given vent to anger simultaneously, until be full of water in spiral case 5, if now only escape pipe 4 water outlet, can judge that the sealing of spiral case 5 is good.After having inspected, by the water emptying in spiral case 5.
B, in spiral case 5, inject gypsum slurries by inlet pipe 3, until slurries are full of whole spiral case 5(when escape pipe has slurries to overflow, show to be full of slurries in spiral case); The high strength gypsum powder that do not expand that after described gypsum slurries adopts crystallization, intensity index is identical or close with spiral case 5 external wrapping concrete intensity is made, and when spiral case 5 external wrapping concrete intensity is C25, then can select α 25 model high strength gypsum powder.
C, after gypsum slurries solidifies, by specification to its maintenance, then carry out hydropower station expansion construction.
After d, hydropower station expansion construction complete, utilize the characteristic of water-proof gypsum difference, the filler plaster in spiral case 5 is sprayed water, allow it absorb water.Due in wet environment; cohesion in gypsum crystal weakens; intensity is caused to reduce; machinery is now adopted to be dug out by large-scale gypsum and reclaim; only stay and be cemented in the topping of a small amount of gypsum on spiral case 5 inwall as spiral case 5 inwall; finally adopt water under high pressure to wash away residual gypsum, under the impact force water effect of flowing, gypsum destroys faster, carries out drainage simultaneously collect process to waste water.
For preventing gypsum slurries outflow in filling process from having an impact to peripheral part, before implementation step b, the equipment that may flow through can be flowed out to slurries and carrying out covering protection.
Claims (4)
1. the spiral case guard method in hydropower station expansion construction, is characterized in that step is as follows:
A, the water intaking valve of closing spiral case (5) and stator (6), make spiral case (5) inside form the watertight cavity of a sealing, arrange that the inner inlet pipe (3) of spiral case (5) and escape pipe (4) are stretched in one end simultaneously;
B, inject gypsum slurries in spiral case (5), until slurries are full of whole spiral case (5) by inlet pipe (3);
C, after gypsum slurries solidifies, carry out hydropower station expansion construction;
After d, hydropower station expansion construction complete, water spray in spiral case (5), after the gypsum injection index of its inside reduces, excavates gypsum and reclaims, only stay one deck gypsum on spiral case (5) inwall as topping, finally with water residual gypsum washed away and make it come off completely;
The not expanding gypsum powder that after described gypsum slurries adopts crystallization, intensity index is identical or close with spiral case external wrapping concrete intensity is made;
The water inlet end of described spiral case (5) is provided with interim plug (1), and described inlet pipe (3) and escape pipe (4) are arranged on this plug.
2. the spiral case guard method in hydropower station expansion construction according to claim 1; it is characterized in that: after in step a, each parts have been arranged; checked the sealing of spiral case (5) to spiral case (5) interior water filling by inlet pipe (3); its test stone is; after being full of water in spiral case (5), only escape pipe (4) water outlet.
3. the spiral case guard method in hydropower station expansion construction according to claim 1 and 2, is characterized in that: inject gypsum slurries in spiral case (5) before, and the equipment that may flow through after flowing out slurries carries out covering protection.
4. the spiral case guard method in hydropower station expansion construction according to claim 1 and 2, is characterized in that: in described steps d, carries out drainage collection to the waste water obtained after flush clean.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210432533.8A CN102912773B (en) | 2012-11-02 | 2012-11-02 | Volute casing protecting method in hydropower station expansion construction |
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| CN201210432533.8A CN102912773B (en) | 2012-11-02 | 2012-11-02 | Volute casing protecting method in hydropower station expansion construction |
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| CN102912773A CN102912773A (en) | 2013-02-06 |
| CN102912773B true CN102912773B (en) | 2015-01-28 |
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| CN104389717B (en) * | 2014-09-17 | 2016-06-22 | 中国电建集团西北勘测设计研究院有限公司 | A kind of method determining Hydropower Unit worm frame compression clearance |
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| JP3037221B2 (en) * | 1997-09-08 | 2000-04-24 | 忠義 植本 | Hydroelectric generator |
| CN101603304B (en) * | 2009-07-23 | 2010-10-27 | 河海大学 | Construction method for repairing disjoint of water turbine volute by hydraulic structure disjoint filling silicone adhesive |
| CN102535411A (en) * | 2012-02-18 | 2012-07-04 | 姚文龙 | Method and device for draining secondary power generation of hydropower station |
| CN102758425B (en) * | 2012-07-23 | 2014-06-11 | 天津大学 | Preloading filling spiral case preloaded seam constructing device of hydropower station and implementing method thereof |
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