hollow bar products @hollowbar-blog - Tumblr Blog

The quality test of Sinorock self drilling hollow bar

According to the different aim of the quality test of self drilling hollow bar,the test can be divided into two parts include foundamental test and inspection test.

The basic objctive of the experiment is to make sure the maximum bearing capacity of the self drilling hollow bar and to master the security degree of the anti-damage of hollow bar to moderate the configuration and parameters of the anchor bolt and improve the technology of the production of self drilling hollow bar.

In order to ensure that if the hollow bar has sufficient loading capacity,if the longitude of free section is as required,if the bar creep is able to keep stable within the range of specifications.The test have to be done to provide high quality anchoring products for our clients and guarantee a good effect in the constuction.

Depending on the various loading mathod we will apply different equipmens.In general,single jack loading measurement and double jack loading measurement can be used to enforce loading.

While,the single jack loading method introduces a tension jack and oil pump to exert tension force on the out part of the hollow bar.

If you have any problem please don't feel hesitate to contact us at any time,we are appreciate for your nice gesture very much!

Rotary injection adapter of self drilling hollow anchor bolt

Rotary injection adapter is used for driling and grouting at the same time.It makes drilling and grouting in a single operation,thereby reducing whole anchoring process and guaranting optimum bond of ground and grout within the borehole. Application: Choosing a suitable adapter depends on the configuration of output end of rock drill,size of anchor bar will be installed and grouting pressure. Most of ratary injection adapters have female configuration with internal R,T or H thread profiles. Features: 1.If the thread of top drive is female,a balance rod is required to connect the two females together. 2.Alternative shank configurations are avaliable on special order. 3.Adapter couplers or male/female changers are also offered.The use of affliated components,within the top equipment,will reduce the length of anchor bar that can be installed. If you have better advice for the manufacture of our products please tell us,we will be appreciate for your kindness and nice behavior. Or if you have any question about our rotary injection adapter of self drilling hollow anchor bolt please don't feel hesitate to contact us at any time,we are appreciate for your support very much!

Resin hollow bar is a sort of quiet new advanced anchoring means

As you know that,resin hollow bar is a sort of quiet new advanced anchoring means and has been extensively adopted in a great many industries involving mining,tunneling,foundation support project,hydroelectric project,slope stabilization together with other geological engineerings. The procedure to install resin self drilling anchor bar is extremely important in the operation.And I will introduce some demands that should be noticed in the process of anchoring. 1)The anchor bar will be needed to be installed in the center of roadway as desired. 2)The stir facility of resin anchor bar should take consider of coal electric drill or single pneumatic anchoring implement and so on. 3)While in the course of installation of resin anchor bolt,screw the anchor head with nut to the threaded hollow bar.For example,6 million sets of couplers will be involved in the construction of the fifth roadway support project,two anchor nuts should be implemented closely to the rod body and then the depth of borehole can be measured and marked,at the same time,resin capsule is ought to be carried to the bottom of borehole with the support of anchor bar.The time of stirring is depend on the mechanical properties of resin capsule.

More information here

Various structure of different rock bolt

With the huge contribution of finance in the construction of foundation support,hydroelectric support project,slope stabilization,civil engineerings and so on,there are also a great many kinds of anchor bar that has been applied,which cover wedge seam anchor rod,expansion shell rock anchor,inverted wedge anchor, anchor rope or reinforced mortar, within the up-anchor, pipe seam bolt, resin bolt, hollow injection bar, fiberglass anchor bar,hollow steel bolt, prestressed grouting large cable, modular anchor, self-drilling bolt and dozen varieties series.

Due to the various structure of different rock bolt,the mechanism of rock anchor are extremely distinct with each other.There are large majority of bolting projects aboard has suggested that different configuration of hollow rock anchor lead to various bolting outcome in series of soil condition.The featured anchor bar that has been widely used indicate that not only the placing effect of rock bolt can be warranted but also outstanding economical and social benefits can be achieved with reasonable design of anchor bolt plus the careful inspection&analysis of the process of construction.

Besides,to be an advanced new type of self-drilling anchor,it has been significantly involved in transportations,water energy,roadway project,highway project and other industries.

More information here

The development history of self drilling hollow bar

The self drilling hollow bar is first used in tunneling raodway support project in America in 1911. In 1918,Sealy Xi'an mine started Rope Shoring, in 1934,Sher law dam began to use prestressed bolting (cable). At present,various rock bolts have reached hundreds of different kinds, and many countries and regions have all developed a bolt norms or recommended standards. Our country in the 1950s began to use rock bolts, in 1960s, our country began extensive use of anchoring technology, especially in the construction of underground mine workings, railway tunnels, road tunnels, drainage holes and a large number of ordinary bonding type anchor and injection concrete support. In recent years, with the rapid development of highways, road slope, a large landslide governance began to use prestressed anchor reinforcement technology. Geotechnical anchorage technique almost throughout all areas of civil engineering, such as slope stabilization, excavation, tunneling, dam, wharf, locks, bridge support and so on. Sinorock is a professional supplier of anchoring products and it has excellent development and rearch&development team,with so many years of exploration,Sinorock self drilling hollow bar has enjoyed a high level of judgement.

The formation of non-destructive testing method of self drilling anchor bolt

The non-destructive testing method of self drilling anchor bolt which includes acoustic stress wave reflection method and reflection method, as well as developed on the basis of elastic stress wave method, a small strain method,dynamic measurement method, sonic frequency stress wave method, ultrasonic guided wave method.

There are many organizations and individuals have done a lot of research work in theory and engineering application of bolt non-destructive testing, which greatly promoted the development of geotechnical engineering and engineering quality of our anchor nondestructive testing technologies,

However,the non-destructive testing of self drilling anchor bolt is a kind of very complicated system, both in theory and practice, there are still many issues that need to continue to study.

If you have any question and advice about our product please do not feel hesitate to contact us at any time.

More information here

CONTACT US HERE

Subsurface investigation activities During Implementing Self-drilling Anchors

Subsurface investigation activities for anchored systems typically involve soil borings and rock coring. Figure 10 illustrates guideline recommendations for locations of subsurface borings for a permanent anchored wall or slope.

Information on the subsurface soil and rock stratigraphy and ground-water conditions are typically obtained from subsurface investigation activities. Subsurface investigation may also involve conducting in situ soil or rock tests and obtaining disturbed and undisturbed samples for laboratory testing.

Soil and Rock Stratigraphy

The soil and rock stratigraphy at the project site, including the thickness, elevation, and lateral extent of various layers, should be evaluated through implementation of a project-specific subsurface investigation in the process of instaaling self drilling hollow bars.

The following potentially problematic soils and rock should also be identified during the subsurface investigation which may significantly affect the design and construction of the anchored system:

• cohesionless sands and silts which tend to ravel (i.e., cave-in) when exposed, particularly when water is encountered, and which may be susceptible to liquefaction or vibrationinduced densification;

• weak soil or rock layers which are susceptible to sliding instability;

• highly compressible materials such as high plasticity clays and organic soils which are susceptible to long-term (i.e., creep) deformations;

• obstructions, boulders, and cemented layers which adversely affect anchor hole drilling, grouting, and wall element installation.

Vertical load capacity below the excavation base

Vertical load capacity below the excavation base is calculated using common procedures for deep foundations (i.e., driven piles or drilled shafts). Two issues, however, are unique to evaluating axial capacity for soldier beam walls and must be considered. These issues are described below.

• Stress relief in front of the wall caused by excavation will reduce the effective stresses acting on the embedded portion of the soldier beam.

This reduction in stress may vary with depth based on the width of the excavation. Common practice is to assume the effective stress is equal to the average of the effective stress imparted by the retained soil height behind the wall and by the depth of the soil in front of the wall.

• Structural sections are commonly placed in predrilled holes which are filled with concrete. In the case of a structural concrete filling, it is usually assumed that axial and lateral load are shared by the steel and the concrete and lateral capacity computations may be performed on the basis of the hole diameter.

However, in the case of nonstructural (i.e., “lean-mix”) concrete, the shear capacity between the structural section and the lean-mix concrete fill may not be adequate to provide load sharing between the steel and the concrete. This shear capacity should therefore be checked as part of the determination of axial and lateral soldier beam capacity.

From:https://www.fhwa.dot.gov/engineering/geotech/pubs/if99015.pdf

Sinorock R32 self drilling anchor bolt

Brief Introduction R32 self drilling anchor bolt is is widely applied in all kinds of constructions, such as railway system, metro project and infrastructure development. As an efficient anchoring method, it’s also widely applied to pre-support project, radial support project, slope stabilization, foundation support project, soil nail wall, back pull anchor rod retaining wall and other rock supporting work. Features 1.Self drilling anchor bolt prohibits the requirement for a cased borehole. 2.Installation with simultaneous drilling and grouting possible. 3.Easy installation in all directions, also upwards. 4.Reliable, efficient and convenient, which makes high piling output possible. 5.Anchor bars can be cut and lengthened according to your demands. It applies to limited space.

Application: Railway System Metro Project Mining Slope Stabilization Hydroelectric Station Infrastructure Development

Sinorock R-thread bar and T-thread Bar

Sinorock is specialized in the development ,production and sales of ground control products in China,Sinorock owns two companies,Sinorock and Hengnuo,Sinorock is our international brand and primararily responsible for international market.At the same time,Hengnuo,The subsidiary of Sinorock,is our domestic brand mainly charge production and development&research.

All mechanical and physical properties in the light of ISO and SGS certificate,Sinorock thread bar is a kind of heavy duty left hand thread,which combine drilling,anchoring as well as pumping cement together in a single operation.In such case,the consumption of time and labor force can be fully saved.You should also know that blunt or tapered ends are available to suit different kinds of soils like broken rocks,loose soils and so on.

Sinorock pumpable cement bar has won great reputation around the world and available in galvanized or epoxy coated anchor,which ensures anchoring effect in complex ground conditions,well,it's safe,economical and efficient.

Benefits&Advantages of Sinorock thread bar 1 Widespread of applications containing forepoling rock bolting,rock dowels,rock spiles,soil nails,micropiles,etc. 2 Applicable to be applied in accompany with various kinds of drilling machine and suits sorts of either resin cartridges or cement grout. 3 Allow for centralizing of bolt with borehole.

The self tapping system cover a great many versatile anchoring products

The self tapping system cover a great many versatile anchoring products,which contain large-diameter anchor bar,structural bolts,climbing bolts and so on.In addition,similiar to another good ideas,these products apply a much convenient and efficient way to meet kinds of specific requirements.

Sinorock specialty rock bolts have been exported to more than twenty countries,clients are all speak highly on our featured products like self-drilling bolts,fiberglass rock bolts,large-diameter anchor bar,stainless rock anchors and epoxy anchors.

Produced from recycled steel and alloy,the anchor post and rock bolts provide the majority consumption of cost savings by comparing with conventional approach of post placement as it's almost 10 times quicker,asking for minimal labour force and all constructions can be accomplished at one time.

First of all,as a kind of rapidly operated anchoring solution,the rock anchor can be extensively applied in a large range of potential engineerings which including:

1 Permanent support for tunneling. 2 For micro pile reinforcement.As micro pile is able to transmit structural load to foundation and then control the deformation of buildings. 3 Soil nails and rock bolts can be adopted to strengthen and maintain soil and rock in slope stabilization. 4 With casing free,it can be used in civil construction. 5 With duplex-coating protection,rock rod can be involved in subsea reinforcement work.

More information here

Sinorock Self-Drilling Anchor is a kind of exclusive anchoring system

The Sinorock Self-Drilling Anchor is a kind of exclusive anchoring system and is today's great solution to the growing requirements of the hydroelectric industry and geological engineering for economical and efficient production. The self drilling system offers benefits for all areas of its applications, where boreholes would ask for the less consumption of time and materials in the way of drilling with casing systems in unstable or soft soil.

Features and Advantages 1.Suitable to Sinorock standard anchoring accessories, bearing plate as well as centralizer. 2.Especially applicable to various kinds of ground conditions. 3.A fast and efficient installation since drilling, anchoring and grouting can be conducted in one single Operation. 4.Sinorock Self drilling system require nothing for a cased borehole. 5.Operation with simultaneous drilling and grouting possible. 6.Easy implement in every directions, also upwards. 7.Appropriate for working in limited room, height and in areas of challenge . 8.Convenient post grouting system. 9.Hot-dipped galvanizing and frictional resistance for corrosion protection in the environment of moisture,damp and subsea.

Applications Tunnelling Ground engineering Radial bolting \ Slope stabilization\Forepoling\ Micro injection pile\Face stabilization \ Temporary support anchor\ Portal preparation \Soil nailing. Foundation support\ Hydroelectric project\Civil construction\Transportations

More information here

SDA bolt is a kind of anchoring measurement

SDA bolt is a kind of anchoring measurement to pass the loading capacity of rock surface to the deep position of rock mass,as a result,the reinforcement of soils can be fully realized.

Soil nailing is a soil reinforcement techniques to treat densely packed reinforcement approach as soil reinforcement means to increase the strength and durability of reinforced soils.

Once soils get changed,soil nail has ability to provide anti-tension,and this is the moment that the force condition will be the same as SDA bolt.What's more,self-drilling anchor is suffering from full force and two direction of sliding surface is alike,pointing to the inter-face.

While,hollow anchor bar is forced by prestress and accept active force,which is meant to the strength of slope that conducted by anchor tube.With the end of loss of prestress as well as the deformation of slope,the rock bolt will be degenerated as soil nail.

Self-drilling anchor is a kind of hollow bar with international standard full thread,which can be cut and connected at any point according to the specific requirements of various kinds of customers.

If you have any question please contact us at any time,we have professional service team here waiting to provide perfect drilling solutions for you,welcome to negotiate and cooperate with us and we are looking forward to working with you!

More information here

The difference between soil nail and anchor bar

Self-drilling anchor bolt is composed by anchor head,anchor nut,anchor plate,drill bit,centralizer as well as stop-grouting plug,among these,which is combined by anchor head part and anchorage section.According to the demanding requirements of the type of soils,geological engineering and utilization requests,the structure of self-drilling anchor can be designed as round,end expaned and continuous spherical type.

Self-drilling rock bolt is a kind of new structure to transit tension into stable rock stratum,once steel strand or high-strength steel bundle adopted as raw materials of anchor bolt,then this sort of steel bar will be equal to anchor cable that can be involved in the construction of mine,tunnel,foundation support project and civil constructions.

Soil nail is a long thin rod body to reinforce or strengthen soils simultaneously,the installation of soil nail can be realized by drilling boreholes within soils and cover the whole length of anchor bar with grout.Meanwhile,the bonding stress or friction between soil nail and rock mass will be pressured passively and bear the vital tension.

If you have any problems please contact us at any time,we have professional service team to offer outstanding drilling solutions as well as construction approach which will largely reduce the consumption of raw material and save the energy of labor force.

More information here

The evaluation of geological and water geological conditions

The capacity and deform should to be the most vital issue in the operations.Also,as loading object,the excavation of foundation,slope,air mine will face a great many problems about stability and deviation of rock material.In that case,rock mass can not only be treated as bearing object but also increase gravity.

The evaluation of geological and water geological conditions,waste sanitary landfill, earth and stone relics protection are all related to complicated environmental engineering problems.With the increasing concerns toward the living conditions,the sustainable environmental projects have been gradually taken seriously.

The prevention of geological disasters include collapse, landslides, mudslides, ground subsidence that had put a lot threat on the construction structure,prevention projects should be carried out according to specific rock conditions and evolution,in addition,earthquake effect of site and foundation should also be involved into rock engineerings.

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.

More information here

Introduction of the reinforcement measurements to stabilize foundation

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.

The successful accomplishment of geological engineering is mainly depend on the involvement of reinforcement work of self-drilling anchor bolt,which has been seen to be a kind of economical as well as practical drilling solution.Meanwhile,it can provide great support to various kins of engineerings.

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.

The capacity and deform should to be the most vital issue in the operations.Also,as loading object,the excavation of foundation,slope,air mine will face a great many problems about stability and deviation of rock material.In that case,rock mass can not only be treated as bearing object but also increase gravity.

More information here

The variety of self-drilling anchor bar

With the huge contribution of finance in the construction of foundation support,hydroelectric support project,slope stabilization,civil engineerings and so on,there are also a great many kinds of anchor bar that has been applied,which cover wedge seam anchor rod,expansion shell rock anchor,inverted wedge anchor, anchor rope or reinforced mortar, within the up-anchor, pipe seam bolt, resin bolt, hollow injection bar, fiberglass anchor bar,hollow steel bolt, prestressed grouting large cable, modular anchor, self-drilling bolt and dozen varieties series.

Due to the various structure of different rock bolt,the mechanism of rock anchor are extremely distinct with each other.There are large majority of bolting projects aboard has suggested that different configuration of hollow rock anchor lead to various bolting outcome in series of soil condition.The featured anchor bar that has been widely used indicate that not only the placing effect of rock bolt can be warranted but also outstanding economical and social benefits can be achieved with reasonable design of anchor bolt plus the careful inspection&analysis of the process of construction.

Besides,to be an advanced new type of self-drilling anchor,it has been significantly involved in transportations,water energy,roadway project,highway project and other industries. More information here

Trending Blogs

Recently Viewed Blogs

hollow bar products