With the development of the construction industry at home and abroad, the self-drilling anchor system, as the most important solution in the geotechnical anchorage engineering industry, has been widely used in various construction projects. This article systematically introduces the application and advantages of self-drilling anchor bolts.
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The Characteristics of Self-drilling Anchor Bolt
can be applied to the relatively narrow construction space.
4. High-pressure grouting makes it possible to fully fill the gap and consolidate the broken rock mass. The high-strength plate and nut can transfer the stress of the deep surrounding rock to the wall rock evenly, so as to support the surrounding rock.
Advantages of self-drilling bolt
1. Suitable for all kinds of geotechnical conditions. SDA bolt has a better construction effect than those of common anchor bars, especially is used in complex geological conditions, such as easy-to-collapse geology.
2. Unlimited drilling depth. Due to the limitations of existing rock bolt materials and drilling equipment, the conventional rock bolt has a relatively shallow drilling depth, but the self-drilling rock bolt can drill deeper due to its small drilling resistance.
3. Suitable for construction in narrow spaces. The length of the single bolt can be cut or extended as required. Common specifications are 2m, 3m, 4m, and 6m.
4. Simple construction process. The self-drilling bolt can complete the drilling, grouting, and anchoring in one drilling, simplify the technological process and accelerate the construction speed.
5. It helps stabilize the hole wall. When drilling, the screw grouting machine is used to supply cement grout with a water-cement ratio of 0.4~0.5 under pressure, so that the grout can quickly fill the borehole and the rock and soil mass, and be absorbed and solidified by the hole wall to ensure the stability.
Construction Key Points
The construction steps of the self-drilling bolt are as follows:
It is necessary to fully understand the surrounding situation of the project and grasp the influence of surrounding buildings and stratum properties on anchorage construction;
Know about the condition of buried objects and obstacles;
State and quality of groundwater. A large amount of water is needed in the process of borehole grouting. It is necessary to consider whether the groundwater can be used and whether it will affect the construction process.
Check whether the drill rig is good to work, whether the bit and bolt body are damaged, etc.
For more information, please visit Anchor Bolt Supplier.
The hollow anchor bar and the grouting pipe are connected with the drill rig through the rotary grouting adapter, and the grouting is carried out in the process of drilling to achieve the synchronous completion of drilling and grouting.
If the length of a single hollow anchor bolt cannot reach the required drilling depth, the coupler can be used to lengthen to meet the requirements.
Summary
The practice shows that the construction efficiency of the self-drilling bolt is more than 30% higher than that of the traditional grouting anchor bolt. Self-drilling anchorage technology has brought great convenience to the control of disastrous geological conditions, and has been widely used in slope support, foundation engineering, tunnel and underground engineering, etc., exerting the irreplaceable effect of other anchorage materials.
Sinorock has 19 years of anchoring experience and has developed self-drilling anchoring systems that have been used in a wide range of slope engineering projects. Sinorock has a professional technical team, which can provide customers with application technical consultation and systematic solutions based on different geological conditions, application environments, and structures, to help customers improve construction efficiency and reduce comprehensive construction costs. Please contact: [ protected] for a free quote.
Deep Excavations, Retaining Walls, Stabilization, Slope Stabilization, Tunneling in Rock
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Have you ever asked yourself, “What’s the difference between chemical bolts and anchor bolts?” If so, you’re in luck! In this blog post, we will provide a comparison between these two types of bolts to help you better understand their differences.
Chemical bolts are used to secure steel structures such as bridges, buildings, towers, and transmission lines in concrete. They are made of a threaded steel rod coated with corrosion-resistant material and filled with epoxy resin. The resin reacts with the concrete to form a strong bond that securely holds the bolt. Chemical bolts have several advantages over other fasteners; they are easier and faster to install than traditional anchor bolts and require no additional maintenance once installed. Additionally, chemical bolts provide superior seismic resistance because of their high bond strength.
Anchor bolts are used for many of the same applications as chemical bolts; however, there are some key differences between them. Whereas chemical bolts form a strong bond with the concrete, anchor bolts rely on tension to stay in place. This means installation takes longer as nuts must be tightened down on each bolt after it is set. Over time, anchor bolt connections can become loose or even fail due to fatigue or vibration from heavy machinery or wind loads if not properly designed and maintained. Additionally, anchor bolt connections may only meet seismic requirements with additional reinforcement, which can increase costs significantly.
One advantage of chemical bolts is that they can be tightened or loosened without needing tools. This makes them ideal for applications where frequent adjustments need to be made, such as in the construction of scaffolding or temporary structures. Additionally, chemical bolts are less likely to loosen over time than other fasteners, making them ideal for high-vibration applications such as engines and machinery.
One advantage of anchor bolts is that they provide a high degree of stability. This makes them ideal for use in applications where a high level of safety is required, such as in the construction of buildings and bridges. Additionally, anchor bolts are less likely to loosen over time than other fasteners, making them ideal for high-vibration applications such as engines and machinery.
One disadvantage of chemical bolts is that they can be difficult to remove once installed. This can make them impractical for use in applications where frequent adjustments need to be made. Additionally, chemical bolts can corrode over time if they are exposed to moisture or chemicals, making them unsuitable for use in outdoor applications.
One disadvantage of anchor bolts is that they can be difficult to install if the hole size is not precise. Additionally, anchor bolts can corrode over time if they are exposed to moisture or chemicals, making them unsuitable for use in outdoor applications.
When choosing between chemical bolts and anchor bolts for your project, it is essential to consider all factors, such as installation time, cost, seismic performance requirements and long-term maintenance needs, before deciding. Chemical bolts offer many benefits over traditional anchor bolt connections, including faster installation times, higher bond strength and better seismic resistance; however, it is essential to remember that each application is unique, so it is best to consult a professional engineer when selecting fasteners for your project to ensure that you choose the right one for your needs. With this information in mind, you can decide which type of fastener is best suited for your project.
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