Soil Nailing Method & Component
Soil nailing method is used to reinforce and fortify the subsisting ground. Under soil nailing method, the bars are narrowly placed and set up into a slope or excavation as the construction continues from top down.
It is a suitable and inexpensive process of erecting retaining wall for excavation support, support of hill cuts, bridge abutment and high ways.
This method is ideal for cohesive soil, broken rock, shale or fixed face conditions. Besides, it provides good solution to landslide problems since it can be employed in seismic zones.
Soil Nailing Applications
Settlement of railroad & highway cut slopes.
Excavation retaining structures found in metropolitan areas for high-rise building and underground facilities.
Tunnel portals in sheer and inconstant stratified slopes.
Erection and retrofitting of bridge abutments with multifaceted boundaries with wall support under pile foundations.
Settling of sheer cutting to make full use of development space.
Settling of prevailing over-steep embankments.
Soil nailing through prevailing concrete or masonry structures like failing retaining walls and bridge abutments to maintain longevity for prolong period devoid of demolition & rebuild costs.
Temporary support is given to excavations devoid of requiring the large and interfering scaffold type temporary works solutions.
Components of soil nailing
The different types of materials are required for nailing which range from steel reinforcements, grout mix and shotcrete/gunite.
To get rid of erosion, all steel materials should be galvanized.
After galvanization, If machine threading is indispensable, then perfect zinc based coating should be used onto the thread.
To make strong resistance against erosion, the PVC corrugated pipe with superior quality and sufficient thickness should employed.
It is recommended to utilize corrugated steel pipe.
For traditional soil nail, the water cement ratio of the grout mix varies from 0.4 to 0.5.
Since grout shrinkage occurs with most cementitious grout, non-shrink additive should be applied to get rid of breeding and grout shrinkage to some extent.
The resistance at grout-soil interface of nail will decrease greatly if the grout shrink.
It can be constant flow of mortar or concrete mixes proposed at high speed perpendicularly onto the uncovered ground surface through pneumatic air blow for dry mix or spraying for wet mix.
To learn the process of soil nailing, go through the following article. www.onlinecivilforum.com