Special equipment and test method for static load test of helical pile pullout resistance of transmission line

Abstract

The invention discloses equipment special for a pulling resistance static load test of a screw pile of an electric transmission line and a test method. The equipment comprises a tripod, a gantry, a hydraulic pump, a hydraulic cylinder and dial gauges; a suspension point is fixed to the top of the tripod; a U-shaped fixing clamp is suspended on the suspension point; the hydraulic cylinder is installed in the fixing clamp; a piston rod penetrates through the fixing clamp and faces downward; the piston rod is connected with a pull rod; the other end of the pull rod is provided with a fixing end connected with the top of the screw pile; a baffle is fixed to the pull rod; the hydraulic cylinder is connected with the hydraulic pump through a hydraulic oil path; a pressure gauge is arranged on the hydraulic oil path; two or more dial gauges are fixed to the gantry; the measuring end of each dial gauge abuts against the baffle. The equipment is applicable to the pulling resistance static load test after the screw pile is installed, the test operation of the screw pile can be completed faster by using the equipment, and especially the on-site test working requirements in severe environments in the wild can be met.

Description

Technical field [0001] The invention relates to the field of static load test of the pull-out resistance of spiral piles. Background technique [0002] Long-distance transmission lines often pass through a variety of geological forms. During the construction of transmission lines, it is inevitable to encounter geological conditions such as sandy soil, marshland and shallow groundwater. These geological conditions have a great impact on the construction of transmission line tower foundations. In recent years, a new type of foundation construction-spiral pile has emerged, this foundation form can effectively solve the foundation construction under these special geological conditions. [0003] Spiral pile consists of two parts, anchor head and extension rod. The anchor head is rod-shaped, with spiral blades at the end. It is screwed into the soil by the driving torque of the power head reducer, and then connected to the extension rod. The extension rod is a plug-in steel pipe. The co...

AI Technical Summary

Problems solved by technology

[0008] Some screw piles in the transmission line are installed at a certain angle, and the existing static load test equipment for pullout resistance cannot guarantee the test angle, and the angle deviation of the screw pile is prone to occur after the test

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