首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 15 毫秒
1.
1.  Provision for stability of slopes is one of the main problems in designing plains PSHS.
2.  The reasons for occurrence and a chain reaction of development of landslide phenomena on the south slope of the area of basic structures of the Zagorsk PSHS were peculiarities of its engineering-geological structure that were not properly taken into account in designing and carrying out construction work.
3.  For the purpose of stabilizing the landslide slope, a system of engineering measures was developed and implemented, including a change in the configuration and structure of the right-bank abutment of the upper-basin levee to the water intake, construction of a banquette, filling of a counterbanquette, draining of moraine loams, grading of the slope, surface water diversion, and monitoring of the state of the slope and elements of the antilandslide protection.
4.  Data from full-scale observatins indicate the effectiveness of the antilandslide measures that were performed and a state of the slope corresponding to criteria for the hydro development's safe operation.
5.  Innovative elements of the system of measures to stabilize the south landslide slope of the Zagorsk PSHS are:
–  the complex nature of measures, providing for the optimum set of criteria with respect to reliability, technological efficiency, construction time, and cost of adjusted expenditures;
–  minimization of one-time and total excavation for the banquette, providing for the least disruption of the slope in the process of construction;
–  draining of moraine loams, which has no known analog;
–  the use of an ejector unwatering system, which provides for minimum adjusted expenditures on construction and operation of the drainage system.
Deceased.  相似文献   

2.
1.  Modified wood is an effective substitute of the laminated wood lining of bearing bushings for vertical pump units.
2.  An investigation of modified wood showed that this material in some indices (friction coefficient and wear resistance) is better than laminated wood.
3.  Since there is no mass manufacture and centralized supply of modified wood, it is possible to create a technological department for its production.
4.  Organization of the department does not require capital expenditures and special accommodations.
5.  Machining of the wood is performed on ordinary metal-cutting machines with the use of the tools used when machining laminated woods.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 7, pp. 33–35, July, 1991.  相似文献   

3.
Conclusions  
1.  Gidrospetsproekt should design the groundwater system.
2.  One contractor should drill the wells and operate the groundwater-lowering system.
3.  In connection with the geological conditions, the wells should be of very high quality, for which own enrichment of the filter material (sand of the blanket) and strict control during drilling the wells are necessary.
4.  It is efficient to drill the wells by a 1BA-15V rig with a tool with backwashing.
5.  With respect to piles of the penstock foundation: Drilling the holes for the piles should be done only with casings. To organize 24-h work for increasing productivity. Works on forming the pile heads should be done immediately after concreting the pile. The piles should be tested after each change in the geological conditions.
6.  With respect vertical drainage: the wells should be of high quality, with an enormous safety margin.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 10, pp. 29–33, October, 1999.  相似文献   

4.
1.  The energy-storage hydroelectric station (ESHES) can provide a 1.5–2-fold increase in peak capacity with a simultaneous threefold decrease in daily fluctuations of the water level in the lower pool.
2.  A decrease in the length of the concrete structures located in the river channel (especially the length) of the powerhouse) reduces the consumption of concrete for the ESHES in comparison with the HES, which compensates for the cost of constructing the additional structures of the ESHES.
3.  Unlike the HES, the ESHES operates in a sharp-peak regime and also during passage of flood waters.
4.  Contrarotating pump-turbines are best suited for an ESHES because of various combinations of heads on its turbine and pump parts.
5.  With increase in the speed of multistage hydraulic machines their placement depth decreases and the cost of the powerhouse is reduced.
  相似文献   

5.
1.  The operating regime of the MFPT has a determining effect on the value and direction of action of radial forces.
2.  The presence of radial seals on runners does not lead to an unequivocal decrease of radial forces on the rotor.
3.  The use in MFPT of radial seals of the runner with the geometric parameters used in the usual turbines is accompanied by considerable RFs on the rotor, greater than in the turbines.
4.  A decrease of radial forces simultaneously in the PR and TR will cause difficulties in connection with differences in the values of the optimal parameters of the seals for each of the given regimes.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 22–25, December, 1994.  相似文献   

6.
An analysis of the experience in the Soviet Union and in foreign countries with conveyor transportation in the mining industry, as well as with use of conveyors in hydraulic construction shows that the introduction of conveyor transportation in the field of construction of embankment dams in this country, for delivery of earth-rock material from quarries, as well as for carrying raw materials to concentrating plants processing nonmetallic minerals, will make it possible.
1)  To reduce substantially the personnel nees.
2)  To lower significantly the transportation costs for delivery of earth-rock materials to construction sites and to concentrating plants processing nonmetallic mateirals (rubble, gravel, and sand);
3)  To reduce the need for trucks, by replacing them with conveyors;
4)  To increase the rate of delivery of earth-rock materials from quarries for dam, construction and, consequently, to reduce the times of completion.
5)  To reduce the volume of housing, cultural-welfare, and auxiliary-subsidiary construction in owing to the lower needs for personnel in conveyor transportation;
6)  To eliminate the need for constructing a large number of roads with rigid pavements for large-capacity dump trucks;
7)  To raise the technical level of the earth-rock work.
  相似文献   

7.
1.  Sludge storage ponds can be located on any foundation soils, but economic calculations should be made for selecting the site.
2.  In the presence of seismic conditions, it is necessary to remove weak soils within the shoulder in order to provide its stability with a steepness of the downstream slope up to m=5. Other methods providing stability of the shoulder can also be used with appropriate technical and economic substantiation.
3.  The stability and possible liquefaction of soils of the shoulder should be determined only according to the guide Consideration of seismic loads when designing hydraulic structures, which is the only standard with respect to this problem.
4.  The size of the hydraulic-fill beach is determined on the basis of the particle-size distribution of the slurry.
5.  The permissible minimum width of the hydraulic-fill beach is determined on the basis of calculating the stability of the shoulder.
6.  It is necessary to recommend the construction of a siphon intake (discharge) located on the bank of the settling pool, which gives a more reliable and economical solution.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 53–55, December, 1991.  相似文献   

8.
Conclusions  
1.  In the upper reservoir of the Zagorsk PSS there are standing waves of a complex frequency spectrum having a virtually undamped character.
2.  The excess of the level of the crest of the upper reservoir embankment of the PSS should be selected with consideration of not only waves caused by meteorological factors but also the presence of standing waves.
3.  The standard systems of measuring the upper pool level of the PSS should provide for averaging the measurements.
4.  To eliminate nonproductive water losses through leaks of the close gate apparatus of the PSS units and increased power losses in the SC regime, it is advisable to provide for the installation of preturbine gates at newly planned PSSs.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 10, pp. 39–42, October, 1999.  相似文献   

9.
1.  In certain cases of constructing dams salt-containing soils serve as their foundation.
2.  Under these conditions reliable operation of the structures can be provided only by developing special engineering measures to control dissolution.
3.  All existing methods of protecting saliferous foundation soils of hydraulic structures from dissolution can be divided into passive, active, and combined.
4.  The combined methods should be considered the most effective for preventing removal of salts from foundation soils by the seepage flow.
5.  Large-scale field investigations of the work of the combined method of protecting saliferous foundation soils of the planned Lower Kafirnigan hydro development showed its high effectiveness even in the case of complex engineering-geological conditions at the construction site.
6.  Individual elements of the set of dissolution protective measures investigated under field conditions can be used in hydrotechnical and hydropower construction practice.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 10, pp. 10–14, October, 1994.  相似文献   

10.
1.  A pressure dangerous with respect to cavitation is observed in those places where the vortex core closely approaches the conduit wall (there are places where with formal conversion to the prototype vacuums m H2O are observed, actually the absolute values will be close to the vaporization pressure).
2.  Delivery of air to ducts for the given spillway design reduces but does not remove the dangerous vacuum on the conduit walls.
3.  Large vacuums are recorded both over the length of the outlet conduit and in the dissipation chamber.
4.  The most effective (of those investigated) means of eliminating the vacuum on the conduit wall and in the dissipation structure are the installation of longitudinal ribs and transverse diaphragms in the outlet tunnel and delivery of air to the end of the swirler and dissipation chamber.
Deceased.  相似文献   

11.
1.  The final stage of damming the Irtysh River was carried out without complications owing to thorough preparation for this important stage of works on the part of the entire team of Irtyshgesstroi.
2.  The cut made to the upper cofferdam and undercutting of the cofferdams by dredges considerably facilitated damming of the Irtysh in the final stage.
3.  When modeling damming, the design and research organizations have to approach this important problem in greater detail and from all sides and to investigate the process with the active help in the investigations of those doing the damming.
4.  Damming of the Irtysh River in the region of Semipalatinsk city was complicated by the considerable difference of the actual drop in the gap and that determined on the model owing to the complexity of modeling such a large river with a multitude of branches.
5.  Damming of rivers in the winter at negative temperatures considerably complicates the works both organizationally and technologically, and therefore preparation for damming should be thoroughly perfected.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 13–16, September, 1991.  相似文献   

12.
Conclusions  
1.  The expediency of hydraulic-fill grading of marshy coastal territories and city dumps for housing construction and recreation park and beach zones was proved practically.
2.  Underwater coastal borrow pits in the shallow-water zone can be used for direct dredging of soil.
3.  In the absence of sand borrow pits, fine-grained loamy sand soils can be used for hydraulic filling the construction sites.
4.  To operate dredges on large water areas under conditions of violent wind-wave action, it is necessary to work out a special works organization plan taking into account the preservation of supply lines, machines, and crew during a storm and under ice conditions in the winter.
5.  The possibility of using the ash of heat and power plants for engineering grading of a marshy territory for housing construction on a pile foundation was proved.
Translated from Gidrotekhnicheskoe Stroitel’stvo, No. 9, pp. 29–33, September, 1997.  相似文献   

13.
1.  The designs as well as the total safety factor of concrete-encased steel pressure conduits of operating hydraulic structures were analyzed.
2.  The principles of the existing standards related to calculations of concrete-encased steel pressure conduits were analyzed.
3.  Methods of calculating concrete-encased steel pressure conduits (including forks and distributors), including elements of the inside steel shell and reinforced-concrete part, were developed.
4.  The calculation methods developed were experimental substantiated and tested during designing and constructing domestic and foreign objects.
Translated from Gidrotekhnicheskoe Stroitel'stvo No. 1, pp. 37–44, January, 1999  相似文献   

14.
Conclusions  
1.  Pumped water storage of renewable energy sources is an effective method of coordinating the arrivals of renewable energy and consumer's load which are nonuniform in time.
2.  The use of water storage makes it possible to increase the firm output of power produced by plants based on RESs.
3.  The proposed characteristic makes it possible to optimize the production of plants operating on the basis of RESs and to minimize the volume of the water-storing system.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 11, pp. 12–15, November, 1998.  相似文献   

15.
Conclusions  
1.  The systems of elongated triangles located at elevations 413, 467, and 344 m do not give reliable results, as a consequence of which they cannot be used as horizontal displacement meters.
2.  The displacements of the ends of the adits recorded from the NET readings are a consequence of measurement errors.
3.  The use of string systems as horizontal displacement meters of hydraulic structures can be used only with their complete protection from airflows, which is practically impossible to do.
4.  The use of 3-m invar bars, used as meters of the small sides of the NET, for determining deformations of concrete and bank adits is possible.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 52–54, September, 1998.  相似文献   

16.
1.  The data base for existing ACS PP at hydroelectric plants can be successfully employed as points for monitoring the conservation of an environment of local significance.
2.  It is expedient to discuss this problem with organizations, including local control groups interested in the development of territorial-basin systems for ecological monitoring.
3.  The initiative in creating local territorial-basin support points for monitoring should emanate from guidelines for hydroelectric plants with ACS PP.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 1–4, December, 1992.  相似文献   

17.
Conclusions  
1.  Clearing small silted rivers in the Volgograd and Rostov regions by means of floating dredges confirms the expediency of these works for irrigating farmlands, pisciculture, and improving ecology.
2.  Works on clearing and dredging small rivers have their own characteristics, which should be taken into account when working out the technical documents and performing the works.
3.  Simultaneously with channel clearing, comprehensive measures should be taken to prevent erosion of the banks and pollution of the river by wastewaters.
4.  The project documents should be drawn up with consideration of a multipurpose approach to the use of the river’s water resources.
Translated from Gidrotekhnicheskoe Stroitel’stvo, No. 6, pp. 41–44, June, 1998.  相似文献   

18.
Conclusions  
1.  Theoretical investigations and bench tests on a pump model made it possible to obtain the setting geometry that ensures extremely good power characteristics for pumps having large setting flow areas.
2.  It is recommended to use wear-resistant white chromium-manganese cast iron for components in the setting of the GrT-4000/71 soil pump, which is intended for the transfer of sandy-gravelly soils with a lump size no greater than 60 mm.
3.  Use of a dual-cup rubber shaft seal is recommended to improve the operational reliability of the pump.
4.  To extend the longevity and improve the reliability of the drive of the soil pump, it is proposed to use a bearing with a set of spring that lower the axial forces on the bearing.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 2, pp. 31–37, February, 1999.  相似文献   

19.
1.  A method was developed for calculating structures for static and dynamic actions with consideration of deterministic and probabilistic approaches to the solution of the problems.
2.  The strength and reliability of structures of the machine hall of the powerhouse during discharge of floodwaters were estimated with the use of methods of statistical dynamics.
3.  Elements of reliability theory of engineering systems were used in estimating the reliability of the structures.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 4, pp. 25–31, April, 1994.  相似文献   

20.
1.  Investigations showed that when constructing dams of fine-grained silty soils by hydraulic filling, it is expedient to use the technology of layerwise placement of soil with consolidation of each layer.
2.  Dependences are given for calculating the thickness of the layers and period of consolidation of the soil on the basis of investigations of the dynamics of the hydrophysical properties of these soils in relation to technological factors.
3.  Dependences are also proposed for predicting the density of the hydraulic-filled soil during construction, as well as the distribution of soil in the profile of the structure.
4.  A method is proposed for calculating the technological parameters, in particular, the rate of construction of hydraulic-fill structures, calculating the size and number of the hydraulic-fill plots referred to one dredge, and prediction of the seepage discharge into the foundation of the dams during their hydraulic filling.
5.  The proposed calculation methods make possible a more substantiated approach to the design of hydraulic-fill structures of fine-grained silty soils and technology of their construction.
Translated from Gidrotekhicheskoe Stroitel'stvo, No. 6, pp. 5–9, June, 1990.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号