Self-drilling hollow grouting anchor successfully applied in slope support of hydropower station
Time:2020-08-30From:sinorock View:
During the excavation and support construction of high slope hydropower station, in order to speed up the project progress and protect the vegetation. The main idea of construction is to reduce the amount of excavation works and strengthen the slope support.The maximum excavation height of the right bank slope in Yunnan Lazhai Hydropower Station is 238m. Slopes are steep. The highest slope exceeds 170m of the dam, and there are broken rocks and soil accumulations at the top. During construction, there were problems such as seriously collapsed holes, stuck drills, and slow construction progress. Self-drilling hollow grouting anchor integrates drilling, injection, and anchoring, and does not need to be taken out after drilling, which avoids the phenomenon of hole collapse. The cement slurry entered through the hollow pipe and quickly solidify to provide anchoring force in time and ensure the surrounding rock complete and stable. The self-drilling anchors is suitable for complex terrain conditions especially weak and broken surrounding rocks. It can change the surrounding rock conditions and achieve ideal supporting effects. Therefore, self-drilling anchor system was adopted for support to speed up the construction progress and ensure the construction quality.
Strict control of the drilling process is a key process to realize the integrated function of self-drilling anchor bolts. There are 3 aspects that you need to pay attention:
1、Before drilling, check whether the hollow bar and the holes of drill bit are unimpeded to avoid blockage by foreign objects.
2、Because the construction area contains cataclastic rock or loose soil, the debris generated during drilling is difficult to discharge. In addition to thoroughly clean the borehole with high-pressure air, you can also wash the holes with water. The water can cool down the drill bit simultaneously, which further improves the drilling quality.
3、Due to the different topography and layer structure, the high slope of the Lazhai Hydropower Station was divided into multiple areas during construction, and 3 drilling depths of 6-9m, 9-12m, and 12-15m were set. In order to facilitate the construction, the single length of the self-drilling bolt is usually 3 meters. During drilling, the coupler was used to lengthen the hollow bar and achieve the design depth. The coupler and the tool connecting drill rig and hollow bar have high torque and easily damaged, which should increase inventory to ensure the project progress.
The use of self-drilling hollow grouting anchors and strict control of construction procedures have enabled the completion of the high slope support project of Lazhai Hydropower Station. The success of the project confirmed that self-drilling hollow grouting bolts not only improve the overall stability of weak and broken surrounding rock through pressure grouting but also not affected by the collapse during drilling, which has great significance for guiding the construction of similar projects.
latest news
-
- Application of Self-drilling Rock Bolt in Loose Soil Foundation Support
- Time:2022-08-08From:This Site
- The self-drilling rock bolt realizes the integration of three functions of drilling, grouting, and anchoring, and can be constructed safely and efficiently unde
- View details
-
- Types of Self-Drilling Rock Bolt Drill Bits and Applicable Geological Conditions
- Time:2022-08-04From:This Site
- The drill bit is an important part of the self-drilling rock bolt, and it is a necessary condition for the integration of the three functions of drilling, grout
- View details
-
- Rock Anchors for High and Steep Slope Stability of A Nuclear Power Plant
- Time:2022-07-15From:This Site
- In engineering construction, geological disasters such as the collapse of high and steep slopes and landslides will bring immeasurable losses to the safety of e
- View details
-
- Quality Control, the Vital Factor of A SDA Bolt Factory
- Time:2022-07-22From:This Site
- The self-drilling rock bolts are applied to support the tunnels, reinforce the foundations, and stabilize the slopes that are in bad conditions. The constructio
- View details
-
- Spring Day Celebrations
- Time:2021-04-30From:This Site
- In this spring season, do everything that makes us happy. In any case, we should enjoy life.
- View details
-
- A Meaningful Christmas Day - Decorating Christmas Tree with Colleagues
- Time:2020-12-25From:This Site
- The Christmas party is a staple of office life-a way for teammates to socialize in a non-work setting. We had a pleasant and meaningful day. We decorated the Christmas tree together.
- View details
-
- Sinorock Will Attend 2022 Bauma CTT Russia Expo Trade Fair in Mosco
- Time:2022-05-12From:This Site
- Sinorock will attend the 22nd Bauma CTT Russia Expo on May 24-27, 2022. Check the detail information below: Booth Number: Exhibition Hall 13, 528Address: Crucos
- View details
-
- Great News: Sinorock Will Attend DFI 46th Annual Conference on Deep Foundations Online!
- Time:2021-09-30From:This Site
- DFI used to hold the annual conference on deep foundations offline. However, due to the global spread of COVID-19 and ongoing travel and group gathering restrictions, additionally, DFI will hold the conference online from Oct 12th to Oct 15th this year. Sinorock will be there on time.
- View details
-
- Sinorock® is attending DFI Virtual SuperPile 2020 Event
- Time:2020-06-05From:This Site
- Sinorock® is continually supporting DFI as a sponsor, and always following closely as a member. Sinorock wishes the virtual SuperPile event a great success!
- View details