Prestressed anchor pin with sand solidified inner head and its anchoring method
A prestressed, inner anchor head technology, applied in the installation of bolts, earthwork drilling, mining equipment, etc., can solve the problems of wooden seals that cannot reach the predetermined position, bolt anchorage failure, adverse environmental effects, etc., to achieve fast construction, Increased success rate and significant economic benefits
Inactive Publication Date: 2006-06-14
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
[0006] In the existing sand-consolidated inner anchor head prestressed anchor rod structure, the sealing of loose sand is realized by the friction force generated by the wooden seal being soaked in water and the rock wall. It has adverse effects on the environment, and its source is difficult; second, its production must go through cumbersome processes such as material selection, cutting, drying, compression, and lathe processing; third, the expansion rate of the wooden seal after soaking in water is affected by factors such as temperature and water absorption. Difficult operation; more often, the wooden seal cannot reach the predetermined position, and the anchor bolt fails due to insufficient friction between the wooden seal and the wall of the drilled hole
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Embodiment Construction
[0017] Below in conjunction with accompanying drawing, the present invention will be further described:
[0018] Depend on figure 1 It can be seen that a prestressed anchor rod with a sand-consolidated inner anchor head includes a load plate 1, a hollow sand cylinder 2, a steel ring 3, a steel pipe 4, an anchor body 5, a pressure plate 8, and a lock nut 9. Put it into the borehole 6 for anchoring, the rock and soil mass can be strengthened. The anchor body 5 is a steel bar with an external thread at one end, and the load plate 1 is a circular steel ring, whose inner diameter can just pass through the anchor body 5, and its outer diameter can just be put into the borehole 6, which is generally larger than the borehole. 6 The diameter is 3 to 4 mm smaller, and the end of the anchor body 5 without external thread passes through the loading plate 1 and is fixed on the loading plate 1. The inner and outer diameters of the hollow sand cylinder 2 are the same as those of the loading...
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The invention discloses a prestressed anchor rod with a sand-consolidated inner anchor head. The prestressed anchor rod comprises a load plate (1), a hollow sand cylinder (2), a steel ring (3), a steel pipe (4), an anchor Rod body (5), bearing plate (8) and lock nut (9). The rigid seal composed of the steel ring (3), the steel pipe (4) and the bearing plate (8) is used to replace the existing wooden seal, which has low cost, simple manufacture, convenient operation and quick construction, and greatly improves the anchoring performance of the bolt. Success rate. The invention also discloses an anchoring method of the prestressed anchor rod, which can conveniently apply the prestressed anchor rod of the sand-consolidated inner anchor head to engineering construction, and can quickly form the prestressed force required for anchoring.
Description
Technical field: [0001] The invention relates to geotechnical engineering anchoring technology, more specifically relates to bolt support technology. Background technique: [0002] Geotechnical engineering is a civil engineering that takes rock and soil as the work object and involves the utilization, remediation and transformation of rock and soil. Anchorage technology in geotechnical engineering is a general term for reinforcement technologies that effectively control the stability of rock and soil and make it have service functions in the utilization, remediation and transformation of rock and soil with anchoring and shotcrete support as the main technical measures; Soil engineering anchoring technology is widely used in mines, shafts, traffic tunnels and urban subways, underground water conservancy and hydropower plants and tunnels, slopes and dam foundations, and national defense and civil air defense projects. [0003] As a support method, bolt support is fundamentall...
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IPC IPC(8): E21D21/00E21D20/00
Inventor 覃卫民葛修润黄智慧曾国洪王水林
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI