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2019-9-5 · proper function of the threads and the coating prevents corrosion. Less work on site saves time and there are fewer parts to handle for stock management. • Bolts are clamped in groups and loaded on pallets. This prevents transport damage and simplifies managing number of bolts in stock. • Short distance from end of grouting pipe to
Get Price2019-9-6 · proper function of the threads and the coating prevents corrosion until fully grouted. Less work on site saves time and there are fewer parts to handle for stock management. • Bolts are clamped in groups and loaded on pallets. This prevents transport damage and simplifies managing number of bolts in stock. • Easy and fast to grout.
Get PriceWorkers are installing rock bolts in the face area while grouting of the bolts takes place at a convenient time and distance behind the face (typically about 50m). Combination bolts contribute to efficient tunnel advance and when needed, we also offer self drilling anchors (SDA), either HDG- or …
Get Price2021-1-5 · This ensures proper function of the threads and the coating prevents corrosion until fully grouted. Less work on site saves time and there are fewer parts to handle for stock management. • Bolts are clamped in groups and loaded on pallets. This prevents transport damage and simplifies managing number of bolts in stock. • Easy and fast to grout.
Get Price2021-1-5 · A combination bolt is installed for immediate support of rock, anchored by an expansion shell, to be fully grouted at a later stage, allowing it to be classified as permanent support. The advantage is that a single bolt is effective for immediate work protection at the face after torque tensioning, while later gaining additional corrosion ...
Get Price2019-10-4 · 1 2 3 4 5 6 7 8 9. The Pc-Bolt™ is a combination bolt that has several additional benefits and functions than traditional rock bolts. Once the bolt has been set in the drillhole, it performs imme- diately as temporary rock support. Thereafter it is grouted and performs as a fully grouted rock bolt.
Get Price2018-12-11 · The advantage is that a single bolt is effective for immediate work protection at the face after torque tensioning, while later becoming permanently corrosion protected by the grouting, normally carried out before application of sprayed concrete.
Get PricePretec China (Zhejiang Pretec Metal Products Co Ltd) moved to new factory, 10 000m2. Mechanical production of rock bolts and powder coating. Pretec started to work in the tunnel industry with rock bolts and products for water and frost proofing. 2009. Pretec China (Zhejiang Pretec Metal Products Co Ltd) was established in China, Haining ...
Get Price2021-7-28 · Pretec Finland Oy Ab was established in March 2013. We sell and store products for construction and infrastructure industry. Pretec Group operates in Finland, Norway, Sweden, Denmark and Belgium. Pretec Group also has its own production factory in China (Pretec China), which was built in 2010. We specialize in: Rock support Frost and water ...
Get Price2019-9-6 · conditions, except when very high rock stresses may produce large radial deformations or strain bursting. We produce two types of combination bolts - NC-Bolt (rebar bolt) and Pc-Bolt™(tube bolt). Product data sheets and brochures for both bolt types can be downloaded from www.pretec.no. Factory in Haining, Zhejiang, China. Pc-Bolt™ packed ...
Get Price2019-10-4 · Pretec as Jellestadveien 35, NO-1739 Borgenhaugen, Norway Telephone: +47 69 10 24 60 ... benefits and functions than traditional rock bolts. Once the bolt has been set in the drillhole, it performs imme- ... The Pc-Bolt’s design and function Anchoring grooves at …
Get PricePretec Group is currently one of the most important suppliers of anchor bolts for underground engineering in Norway and the Nordic region. The group currently owns 6 companies in Norway, Sweden, Finland, Denmark, Belgium and China. Zhejiang Pretec Metal Products Co., Ltd. is the only R&D base of Pretec …
Get PriceZhejiang Pretec Metal Products Co Ltd. Member of the Norwegian Pretec Group, we produce and offer to the market rock anchor bolts with particularly long service…
Get Price2020-7-2 · All these tests were carried out on rock bolts and dome washer plates supplied by Dextra Pretec. Pull testingwas carried out in accordance with British Standard (BS 7861.1:2007). It was found that the average strength of tested bolts was 32.5 t, elongation 14.5 %. The maximum dome plate deformation load was in the order of 275 kN.
Get PriceAbout Pretec Group. Pretec Group has a history back to 1985 when the first Pretec company was founded in Norway. Since then the company have expanded, slowly in the beginning, but more rapidly the last 10 years. Pretec Group is the main shareholder in all their subsidiaries.
Get PricePretec China (ZheJiang Pretec Metal Products Co.,Ltd) was established in June 2010. We produce and sell products for construction and infrastructure industry. Pretec Group operates in Finland, Norway, Sweden and Denmark. Pretec China is the production and purchase center of Pretec Group. We specialize in: Rock support Frost and water proofing;
Get Price2018-7-13 · Rock Anchors are post-tensioned bars installed in drilled holes for which at least the entire bond length is located in rock. The anchor force is transmitted to the rock by bond between the grout body and the rock. Rock anchors can remain unbonded in the free stressing length allowing the anchor to be checked and retensioned at any time.
Get Price2017-8-30 · years, and different types of yielding rock bolts are now in the market available. This could be an interesting presentation for next year But also elements used with our current conventional methods must be modified such as fiber reinforced shotcrete and wire mesh, with specifically designed energy absorption or yield capability.
Get PricePretec AS – www.pretec.no – Telefon: 69 10 24 60 Innhold kan endres uten forutgående beskjed. Rebar bolt Ø25/M24 Rock support bolt/ceiling bolt Rock support bolt. The end of the bolt is obliquely cut for improved polyester mixing. Can also be used fully embedded in polyester or cementitious mortar.
Get Price2018-9-21 · installation. For short term applications the bolts are generally left ungrouted. For more permanent applications or in rock in which corrosive groundwater is present, the space between the bolt and the rock can be filled with cement or resin grout. Dowels or anchor bars generally consist of deformed steel bars which are grouted into the rock.
Get PricePretec Group AS produce and offer high quality rock anchor bolts with particularly long service life using PC-Coat corrosion protection. [email protected] Even A. Karlsen
Get Price2020-9-24 · GEWl® Soil and Rock Bolts DYWI® Drill Soil and Rock Bolts Slope Stabilization and Sidehill Cuts The development and expansion of infrastructure – and, more specifically, the construction of high-speed corridors – poses significant requirements in terms of route planning. The expansion of motorways by adding more lanes often
Get Price2014-8-1 · Fully-grouted rebars are mechanically bound to the grout/rock through the tiny ribs on the cylindrical surface of the bolt shank and are thus a type of CMC bolt. Split set and inflatable bolts such as Swellex and Omega are CFC bolts, since they are bound to the rock mass mainly via friction resistance along their entire length.
Get Price2018-8-10 · rock support bolts mortar grout test grouting Det ble utført forsøk med både 3 og 5 m lange bolter. Halvparten av boltene var montert vertikalt og halvparten var montert med helling 20 grader fra horison-talen. Alle bolter ble gyset nedenfra. Det ble benyttetgrad ble
Get Price2020-10-14 · the use of glass-fiber reinforced rock bolts as construction elements in the main load bearing system. By doing so, an improved working environment and a reduced environmental impact could be achieved. Keywords: glass-fiber reinforced polymers, ro ck bolts, rock support, work environment, tunnels and caverns
Get Price2019-12-12 · 1 DSI New Developments in Yieldable Rock Bolts 2012 Dynamic Ground Support Application Symposium Thursday, September 13th, 2012 Renn Oler, Engineering Director Dywidag Systems International (DSI) Underground Sys Inc.
Get Price2018-1-4 · Anchor bolts have been extensively used over the world for connecting steel structures to concrete structures. They can be either cast-in or post-installed. However, in many cases, such as in Alteration and Addition (A&A) works in Hong Kong, the concrete has already been cast and set and therefore the anchor bolts are normally post-installed.
Get Price2011-11-5 · D-bolt is a type of energy-absorbing rock bolt. It is made of a smooth steel bar with anchors spaced along the bolt length. A typical section between adjacent anchors is approximately 1-m long, but it can be adjusted to adapt to the rock conditions. The bolt is fully encapsulated with either cement or resin grout in a borehole. The anchors are firmly fixed into the grout, while the smooth bolt ...
Get Price2016-9-3 · Both rock bolts and cable bolts have been used for ground control in this mine. The cross sections given in Fig. 11 show the rock bolt patterns used for all the tunnels. The roof bolts have two patterns which are respectively three bolts (Fig. 11a) and four bolts (Fig. 11b) at each cross section. These two rock bolt patterns alternate along the ...
Get PriceZheJiang Pretec Metal Products Co.,Ltd(Pretec China) was established in June 2010. We sell products for construction and infrastructure industry. China is the production factory of Group .Pretec operates Finland, Norway, Sweden Finland. We specialize in: Rock support Frost ...
Get Price2019-3-20 · Interview begins: 06:44 Debrief begins: 1:06:15. Ken Sills is the co-founder and CEO of Preteckt. Since developing the initial prototype of this hardware/software solution in 2015, Ken has been focused on building Preteckt’s team of engineers, scientists, business developers, and sales professionals so that the automotive industry can benefit from Vehicle Prognostics as a Service.
Get Price2021-7-19 · As the clamping force is a linear function of both the turning angle of the screw and the pitch of the thread, there is a direct relation between the clamping force and the tightening torque within the elastic range of the screw elongation. However, only about 10% of …
Get Price2021-7-29 · Rock bolts. Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter.
Get Price2018-1-4 · Anchor bolts have been extensively used over the world for connecting steel structures to concrete structures. They can be either cast-in or post-installed. However, in many cases, such as in Alteration and Addition (A&A) works in Hong Kong, the concrete has already been cast and set and therefore the anchor bolts are normally post-installed.
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Get PriceZheJiang Pretec Metal Products Co.,Ltd(Pretec China) was established in June 2010. We sell products for construction and infrastructure industry. China is the production factory of Group .Pretec operates Finland, Norway, Sweden Finland. We specialize in: Rock support Frost ...
Get Price2018-5-15 · unconstrained block of rock from a slope, dilatancy will accompany shearing of all but the smoothest discontinuity surfaces. If a rock block is free to dilate, then the second-order asperities will have a diminished effect on shear strength. Thus, by increasing the normal force across a shear surface by adding tensioned rock bolts,
Get Price2021-7-19 · As the clamping force is a linear function of both the turning angle of the screw and the pitch of the thread, there is a direct relation between the clamping force and the tightening torque within the elastic range of the screw elongation. However, only about 10% of …
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