Recyclable umbrella-shaped pressure-bearing ground anchor in soft soil stratum

Abstract

A recyclable umbrella-shaped pressure-bearing ground anchor in a soft soil stratum comprises a support pile of foundation pit engineering, the top of the support pile is provided with a reinforced concrete cover beam, and the support pile and the reinforced concrete cover beam are connected into a whole. An anchor tie penetrates through the cover beam, one end of the cover beam is provided with a threaded part, and the other end of the anchor tie is connected with an anchor bolt. The threaded part of the anchor tie penetrates through the cover beam, and the thread part and the cover beam are fixed by screwing a nut. The anchor bolt comprises an umbrella cover and umbrella ribs. The umbrella cover is a pocket formed by sewing fabric cloth, the bottom of the umbrella cover is square, the corners of the pocket are sewn with long-strip fabric cloth, and corner points of the pocket are provided with a plurality of spacer sleeves. The umbrella ribs penetrate through the spacer sleeves. The pocket is connected with a slip casting pipe and a short pipe. The pocket, the slip casting pipe and the short pipe are fastened through a fiber rope. The lower end of the short pipe is inserted into a hanging rod pipe, and the short pipe and the hanging rod pipe are welded into a whole. The hanging rod pipe is provided with a plurality of round hole grooves, and the umbrella ribs are installed in the round hole grooves. The recyclable umbrella-shaped pressure-bearing ground anchor has the advantages that the superior and constant pulling resistance performance is achieved, and the using reliability and the safety of the foundation pit engineering are improved.

Description

technical field [0001] The invention relates to a foundation pit project for basement construction in soft soil strata in civil engineering engineering, in particular to a recyclable umbrella-shaped pressure-bearing ground anchor in soft soil stratum supported by anchor pulls instead of foundation pits. Background technique [0002] With the rapid development of national construction and urbanization, the number of cars in the city has increased sharply, resulting in urban road blockage and parking difficulties. In the construction of the community, the parking space of each household must be kept in the basement. How to use the underground space It is a symbol of the development of the country's cities. For this purpose, the available underground space, such as squares, green spaces, roads, buildings, etc., will be built into basements for parking, sidewalks, shopping malls, entertainment and other applications. , the construction of basement must have corresponding foundat...

AI Technical Summary

Problems solved by technology

[0003] If the area of ​​the basement is getting larger and larger, reaching tens of thousands to more than 100,000 square meters, it is impossible to set up internal supports in the foundation pit. An anchor pull structure must be used to ensure the stability and safety of the enclosure structure in the foundation pit project. The small area is nearly 10,000 square meters. The support in the foundation pit occupies the space for earthwork construction, which affects the excavation construction and construction period in the foundation pit.

[0004] At present, there are slurry anchors, recyclable slurry anchors, bag grouting anchors, soil nails, etc., which are used in the market, all of which are realized by the perimeter area of ​​the anchor diameter and the frictional resistance of the soil. Tensile force; according to the creep characteristics of soft soil, the anchor tension of the anchor rods used in the project is gradually decreasing. When the above-mentioned anchor pull scheme is tested for pull-out force at the construction site, it can be known that when the anchor pull-out force detection reaches the design pull-out force, it cannot Keep a constant pull-out force, but the pull-out force is gradually decreasing as time goes on, and the deformation of the foundation pit that depends on the pull-out force is increasing, and it will not be stable. If you want to gradually decrease the pull-out force The force is supplemented by stretching, but the design pullout force value at the time of detection cannot be reached; if the pullout force continues to increase, the anchor will be pulled out of the soil layer, and the creep properties of soft soil have a great influence on the pullout force of the anchor , according to the design code of foundation pit engineering, in the soft soil, the bolt must resist the pull-out test of creep resistance, the pull-out value is too small, and the instantaneous pull-out force value is often used in engineering. As the force gradually decreases, the displacement of the foundation pit will naturally increase, and even the failure of the pull-out force will endanger the safety consequences of the foundation pit.

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