Fully-recycled body expanding anchor rod and construction method for anchoring ground using same

Abstract

The invention provides a fully-recycled body expanding anchor rod and a construction method for anchoring ground using the same. The fully-recycled body expanding anchor rod comprises a main machine rack, a sealed cladding bag and a non-adhesive steel strand, wherein the main machine rack comprises a grouting core pipe, an upper assembly, a lower assembly and a spiral stirrup; the top of the grouting core pipe is connected with a grouting recycled pipe, and the bottom of the grouting core pipe is provided with a one-way valve; the sealed cladding bag is sleeved outside the grouting core pipe and the spiral stirrup of the main machine rack; the both ends of the sealed cladding bag are respectively fixed on the upper assembly and the lower assembly; the non-adhesive steel strand is wounded outside the sealed cladding bag; the both ends of the non-adhesive steel strand extend outside the grouting core pipe; the middle part of the non-adhesive steel strand is adhered to the bottom of the lower assembly; and the positions of the non-adhesive steel strand, which are close to the upper assembly, are slidably connected with the both sides of the outer wall of the upper assembly. With the adoption of the fully-recycled body expanding anchor rod and the construction method thereof, the grouting recycled pipe and steel wires in the non-adhesive steel strand of an anchor beam body can be entirely recycled and reused, so that the construction cost is reduced, and the pollution of the underground soil can be reduced. Thus, the fully-recycled body expanding anchor rod and the construction method are beneficial to energy conversation and emission reduction.

Description

technical field [0001] The invention relates to an anchor rod used in a rock and soil temporary anchoring project in the field of civil engineering and a construction method thereof. Background technique [0002] In the field of geotechnical engineering, in the temporary anchoring projects for excavation and support of various temporary slopes and deep foundation pits, it is necessary to use prestressed anchorage technology to keep the side walls of slopes and foundation pits stable. At present, a large number of traditional full-length and equal-diameter anchoring techniques are used to construct foundation pit support projects. This type of traditional anchoring method has the following two problems: [0003] 1. In strata with complex engineering geological conditions, such as anchor rods (cables) installed in soft and loose strata, due to factors such as low friction in the anchorage section, the unit anchorage bearing capacity is low and the deformation is large. In the...

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Problems solved by technology

[0003] 1. In strata with complex engineering geological conditions, such as anchor rods (cables) installed in soft and loose strata, due to factors such as low friction in the anchorage section, the unit anchorage bearing capacity is low and the deformation is large. In the traditional anchoring process, the length of the unit anchor (cable) is usually increased or the pipe is drilled to solve such problems, resulting in a sharp increase in the cost of hole formation and a waste of anchor reinforcement materials, which is not conducive to saving steel, cement and Energy conservation

[0004] 2. The anchor rods in the temporary support system have no effect after the service period. As a temporary support structure, the pile-anchor system is widely used in urban construction and municipal foundation pit engineering. These are used for support After the end of the service period, the anchor bolts will be left underground in the future construction site and cannot be recycled, causing serious underground pollution and waste of resources. According to incomplete statistics, there are more than 1,000 tons of unbonded steel strands in Beijing alone every year It remains underground; while the anchor rods used for foundation pit support often extend out of the red line range, which violates the underground space of adjacent buildings, and increases underground obstacles and construction costs for the development of adjacent spaces

At present, some expanding body anchoring construction techniques that have been developed in my country use a single method of increasing the diameter of the anchor hole to increase the anchoring force, which cannot implement recyclable anchor bars. There is no corresponding improvement in innovation, which limits the application of the technology of expanded body anchorage in the foundation pit engineering where the subway tunnel crosses or in the situation where the foundation pits of adjacent buildings are close together, which affects the further development and application of the technology

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