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[en] In this project we will analyze the identification of risks and the management of preventive measures of roofs, but not only focusing on the material execution phase, but also on subsequent steps such as maintenance, repairs…
[en] The paper deals with the stability of rock masses during underground opening construction. In mining works for ores exploitation with rectangular profile a method combined for reinforcement of rectangular profile was used. The reinforcement system, as part of the roof controls system, helps the rock mass to support itself above the entries improving their stability. The most important task for this is providing confinement. Roof control in this context means the control of the roof strata in the vicinity of the underground opening. Other components of the roof control system are control and standing support. Based on the experimental measurements, at uranium Crucea mine, and a numerical analyzing of state of stress on mining works, the rock bolting support was choose and a combined method was applied
[en] The aim of this case report was to introduce a modified design of palatal crib habit breaking appliance that can be used for children with predetermined thumb-sucking habit. The appliance is made of two bands on the upper first permanent molars and an extended metal framework to cover the anterior of the palatal roof. The appliance was applied for 4 months on an 8-year-old boy who persistently continued the habit of thumb-sucking. The appliance proved to be very effective for arresting thumb-sucking habit. (author)
[en] In order to research the climate responsive of roof buffer space in Tujia traditional folk dwellings, two typical dwellings were taken as the research objects to measure relevant environmental parameters. Subsequently, the measurements were compared to analyze the coupling relationship between roof buffer space and indoor thermal environment. Analysis shows that the roof buffer space has the remarkable ability to block solar radiation, with the cooperation of valley-mountain breeze, which makes up for the shortcomings of poor thermal inertia and small heat insulation of wooden-plank wall dwellings: The indoor temperature peak reduces 2 °C; the range of difference between indoor average radiant temperature and the air temperature is 0.46 °C all day. The findings can guide the construction of modern wood-framed dwellings. (paper)
[en] The thickness and strength of strata composing roof stratum will change a lot because of the change of coal forming environments and long time geological evolution. Only knowing these changes exactly, we can get the right design and prevent roof collapse. We can get the thickness, relative position and location of cracks and roof separation of strata with the changing of length of roadway at any time, and design the roof of roadway dynamically according to the lithology and combination changes of roof. In accordance with these, we can ensure not only the economic, but also safety in production. (paper)
[en] In this invention, the liquid reservoir has a floating roof with a tight connection to its wall by a flexible membrane, forming a space for counterbalancing liquid, and a pressure relief valve for the liquid within the reservoir opening above the counterbalancing liquid. Application for tanks used in nuclear power plant
[fr]L'invention concerne les reservoirs a liquide a toit flottant dont le toit est relie de facon etanche a la paroi du reservoir par une membrane souple qui determine avec cette paroi un espace propre a recevoir un liquide de contre-pression. Le toit comporte une soupape de deversement de liquide interne en cas de surpression, le deversement de cette soupape s'effectuant au-dessus du liquide de contre-pression. Application aux reservoirs utilises dans les centrales nucleaires
[en] The number of accidents that occur during the execution of work on the roof (assembly or disassembly, cleaning, maintenance,), flat or inclined, due to a series of circumstances (the height at which the work is carried out, the weather conditions, the low resistance and fragility of the materials, the slopes, etc.) can cause very serious consequences, almost always fatal or with permanent disabilities that can be avoided if the correct use is made of labor risk prevention measures.
[en] This plan presents background information and a working guide to assist Mine Operations and Engineering in developing strategies for addressing ground control issues at the Waste Isolation Pilot Plant (WIPP). With the anticipated receipt of waste in late 1997, this document provides additional detail to Panel 1 activities and options. The plan also serves as a foundation document for development and revision of the annual long-term ground control plan. Section 2.0 documents the current status of all underground excavations with respect to location, geology, geometry, age, ground support, operational use, projected life, and physical conditions. Section 3.0 presents the methods used to evaluate ground conditions, including visual observations of the roof, ribs, and floor, inspection of observation holes, and review of instrumentation data. Section 4.0 lists several ground support options and specific applications of each. Section 5.0 discusses remedial ground control measures that have been implemented to date. Section 6.0 presents projections and recommendations for ground control actions based on the information in Sections 2.0 through 5.0 of this plan and on a rating of the critical nature of each specific area. Section 7.0 presents a summary statement, and Section 8.0 includes references. Appendix A provides an overview and critique of ground control systems that have been, or may be, used at the site. Because of the dynamic nature of the underground openings and associated geotechnical activities, this plan will be revised as additional data are incorporated
[en] The aim of this article is to define an evaluation model for the environmental impacts of building envelopes to support planners in the early phases of materials selection. The model is intended to estimate environmental impacts for different combinations of building envelope assemblies based on scientifically recognised sustainability indicators. These indicators will increase the amount of information that existing catalogues show to support planners in the selection of building assemblies. To define the model, first the environmental indicators were selected based on the specific aims of the intended sustainability assessment. Then, a simplified LCA methodology was developed to estimate the impacts applicable to three types of dwellings considering different envelope assemblies, building orientations and climate zones. This methodology takes into account the manufacturing, installation, maintenance and use phases of the building. Finally, the model was validated and a matrix in Excel was created as implementation of the model. - Highlights: • Method to assess the envelope impacts based on a simplified LCA • To be used at an earlier phase than the existing methods in a simple way. • It assigns a score by means of known sustainability indicators. • It estimates data about the embodied and operating environmental impacts. • It compares the investment costs with the costs of the consumed energy.