A standard sand recovery device and its use method in the test of pavement compaction degree by sand filling method

Abstract

The invention discloses a recovery device for standard sand in a test of measuring road surface compactness through a sand filling method and an application method of the recovery device. The device comprises a dual-layer cylindrical hard sleeve, an upper end cover, multiple lead screws and bottom rotary knob type fan blades. A rotary knob and a main rotary lead screw which can provide torque forsimultaneous and same-direction rotation of multiple transverse transmission lead screws are arranged at the top end, the transmission lead screws penetrate through an end cover and the barrel wall ofthe holed cylindrical hard sleeve, the multiple layers of rotary knob type fan blades are connected to the bottom, and the steering positions of the two ends of the lead screws are each provided witha set of bevel gear transmission device so as to the torque in the transverse direction and the longitudinal direction. During use, the top rotary knob is rotated and can drive the lead screws to rotate in the same direction, the lead screws drive the bottom fan blades, the fan blades are opened in the rotating process, the multiple fan blades can form a closed bottom face when rotating to the largest position, bottom sand is transversely cut, and a whole sand sample in a barrel body can be overall lifted up. According to the recovery device, the sand sample recovery rate is 90% or above, theeconomical and environment-friendly significance is achieved, and the recovery device is simple in structure, reasonable in design and convenient to operate during use.

Description

technical field [0001] The invention belongs to the field of road surface detection equipment, and in particular relates to a recovery device for standard sand in a road surface compaction test using a sand filling method and a use method thereof. Background technique [0002] In road engineering construction, the measurement of subgrade compaction is one of the indispensable inspection items for testing units. The quality of compaction directly determines the quality of the project and the maximum bearing capacity of the road. If the compaction cannot reach the control standard, The pavement will be prone to uneven settlement, which will lead to network cracks and even tensile failure on the pavement. [0003] At present, the common detection method of subgrade compactness in testing units is to use the sand filling method specified in JTGE60-2008 in the "Highway Subgrade Pavement Field Test Regulations" to measure the subgrade compaction. This method first manually digs a ...

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a sand sample recovery device and its use method in view of the serious waste of standard sand in the test of road surface compaction by the sand filling method. The sand sample recovery device has a simple structure and is easy to operate. And the use effect is good, and the standard sand in the test pit can be recovered and reused quickly and without impurities

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