Sinorock hollow steel bar is a valuable and multi-functional additions to engineers
1.Powerful anchorage:with T-thread type,the self drilling hollow steel bar can be well connected by couplers and bonded best with grout.
2.Excellent anchorage:since cement grout is injected from the bottom of borehole,full and unniform coverage of grout can be done along the full length of rock bolt.
3.Convenient construction:compared with traditional anchoring process,the procedure of drilling,anchoring,installing grouting pipe can be completely prevented,which makes the construction full of convenience.
4.By contract with common hollow bar,self drilling hollow steel bar makes grouting can be operated after anchoring.And grouting pressure is up to ten kilogram,hollow steel bar can not noly be used to fill borehole but also improve the structure of surrounding soils by injecting cement grout into the crevice of rock in poor mass,under high grouting pressure,the good anchoring effect can be clearly seen.
5.Hollow steel bar is combined of full thread rock bolt,exhausting pipe,anchor head,stop-grouting plug,anchor plate,anchor nut.
6.Use anchor trolley or air gun drilling, and Delicate hole with high pressure.Use mine auger to drill borehole when facing complicated soil conditions.
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51_940
Hollow Anchor Bars adopts a certain bent flexible strand through pre-drilled boreholes and should be anchored deep in the surrounding rock in some way, the exposed part consists of a series of reinforcement means by working through the pre-tensioned bolt clamping tray of surrounding rock. 
Its characteristics is combined with deep anchorage of surrounding rocks, high load carrying capacity, a large preload can be applied, and thus ideal supporting effect can be obtained , which is the most reliable and most effective means. Strengthening its range, support strength, reliability and some other properties are not ordinary bolt can compare.
Anchor bars can be applied in mining,tunneling,foundation support project,hydroelectric project and roadway project in accompany with the support of self drilling anchor bar,
In recent years,a great many advanced anchoring approach has been developed and implemented,small aperture anchor is mainly used in crushing, composite roof roadway; along with the top coal caving roof coal seam floor excavation roadway; weakness and highland stress roadway; and large span open - off cut and roadway intersections.
More information here
　
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76_940
It has been more than one hundred years since the initial application of rock anchor in the reinforcement of foundation project of UK North Wales outdoor shale in 1872 as well as the adoption of anchor bolting approach under the roadway support project in German in 1912.
The first involvement of hollow anchor bar in China is comes from 1950s,when the wide development of civil economy was just begin.And now the technology of rock bolting has been rapidly improved and applied.What' more,the implementing proportion of rock bolting technique in the construction of some mines are up to 90%,and another are more than 100%,which was therefore can acquire better technological benefits added with economical benefits.
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1)Resin anchor bar is a kind of new placing implement,which embodies pneumatic drills,coal electric drill together with hydraulic drill.
2)The site of borehole should be marked and located in advance.Moreover,the anchor cavity should keep verticle with rock beddings and crack surface,when the conditions are not suitable,the anchor bar will be required to be installed in the center of roadway as desired.
3)Making a clearance of rock powder within the borehole with the utilization of compressed air or water after drilling.the borehole within coal mine or soft rock should not be extruded in case the largement of borehole.
4)There are several points that should be as requirement,containing direction,position and plainess.
According to the category of resin capsule and its solidafication time,which can be defined as ck type(super fast),K type(fast),Z type(moderate speed) and M type(slow).The typical property of resin anchor bolt can be clearly seen in Sinorock official website.
The installation of resin anchor rod is often follow the underline measurements.
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Sinorock hollow threaded bars are mainly used in tunneling,mining,hydroelectric station and civil construction.Sinorock has provided anchoring products for many projects such as Shanghai-Kunming high-speed railway construction,Baihetan hydroelectric station.Xi'an-Chengdu high-speed railway construction,Pakistan NJ Hydroelectric Project,Malaysia Hulu Hydroelectric Station,Nepal Upper Tamakoshi Hydroelectric Project,Canada ground anchor and so on.
Now Sinorock anchoring products have been widely exported to more than twenty countries.With reliable products and great service,Sinorock has won good reputation all over the world.
Hollow threaded bar is one of the core products of Sinorock,which is widely used in the civil constructions and I will intruduce some of it's properties to you.
The length of anchor bolt is designed to give a full play to it'effect.According to the suspension work,Anchor bolt=anchor body length+reinforcement length+revealing length.Meanwhile,concerning the function of the combined beems,the length of anchor bolt is 1.2 times longer than the conbined beem's length add up with revealing length.The addtional length caused by the unstable outlines  in the process of excavating.
The length of anchorage should be caculated according experience and the depth of the soil that the anchor bolt has been drilled into.In addition,the mean of anchoring and the diameter of anchor bolt should also be taken into consideration.When caculating,the cohesiveness of grout and anchor bolt and the bonding stress of the borehle should be especially considered.
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30_940
 The concept of an anchored wall system is to create an internally stable mass of soil that will resist
external failure modes at an adequate level of serviceability. The design of anchored walls
concentrates on achieving a final constructed wall that is secure against a range of potential failure
conditions. These conditions are illustrated in figure 11. The design should limit movements of the
soil and the wall while providing a practical and economical basis for construction.
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38_940
 Along with the usage of self-drilling rock reinforcement systems, various technical
advantages can be achieved. The adjacent list gives an overview of the main
advantages, which can be pointed out. Some of these topics have already been
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After installation of the soldier beams, the soil in front of the wall is excavated in lifts, followed by
installation of lagging. Excavation for lagging installation is commonly performed in 1.2 to 1.5 m
lifts, however, smaller lift thicknesses may be required in ground that has limited “stand-up” time.
Lagging should be placed from the top-down as soon as possible after excavation to minimize
erosion of materials into the excavation. Prior to lagging installation, the soil face should be
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The Self-Drilling Hollow Bar Anchor System consists of a hollow threaded rod and an macthing drill bot which perfoms drilling,anchoring and grouting in a single operation.The hollow rod agree air and water to fast pass through the threaded rod in the process of drilling to flush the bar and then the cementitious grout can be injected immediately into the rock bolt after drilling is accomplished.
The hollow bar can be completely filled with full length grout and couplers can be applied to connect hollow bars and lengthen the rod body while hex nuts and plates are adopted to offer the desired tension.
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Sinorock is devoted to provide a complete range of ground control products for the foundation support,tunneling,mining and geological engineerings and a great many other civil constructions.Sinorock owns two plants in China,consisting of several advanced rock bolt production lines,accessories processing equipments and integral set of rock anchor testing facilities.
Our affiliates offer versatile self tapping bolts as well as heavy duty anchor bolts,in addition,engineering solutions and drilling measurements plus subsidiary concrete anchors can aslo be introduced to give our global clients sufficient resource for their ground control requirements.
In order to offer reliable and economical ground control products for global customers.
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In the proposed precast concrete substructure
system, the grouted anchor bars carry tensile stress across the joint between the column and cap beam. This joint
is the yielding element in the structural system, and it is crucial to the performance of the structure that the
bars yield before other failure mechanisms, including bond failure, occur.
The utilization of a few large-diameter reinforcing anchor bars for the operation of precast concrete bridge
bents make construction simple for operating by reducing the number of alignments to be made in the field. These
bars are grouted into ducts in a precast concrete cap beam.
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Geological engineering consists of tunnel,foundation,mine,slope and other civil constructions,inevitably traverse all kinds of unstable and complicated geological region,to make sure the construction effect,completely satisfy the function of the engineering,we have to take measures to reinforce and stabilize this area.This article apply some measures to reinforce and strengthen slope,foundation,tunnel and mine.
As an efficient placing approach,self-drilling anchor palys a significant role in supporting rock mass to prevent deformation and excavation,buildings,roadway,bridges,large equipment are all established on the rock, so the stabilization of rock layer will be extremely important.
Rock mass,can not only being as loading object but also capable of bearing itself,the control of underground water will effect the success of foundation support,slope project,tunnel,mine,wharf and other engineering projects.
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