Constant-resistance anchor cable withdrawing device and design method

The constant-resistance anchor cable withdrawing device comprises a jacking head and a clamping device, a clamping groove is formed in the front end of the jacking head, the clamping device is installed in the clamping groove, the rear end of the jacking head is connected with an anchor withdrawing jack, the clamping device comprises a one-way rotating wheel and a limiting device, the one-way rotating wheel comprises a blade and a ratchet wheel which are in rigid connection, and the limiting device is connected with the blade. And the limiting device comprises a barrier strip and a spring. The position of the clamping piece is fixed through the one-way rotating wheel structure, the anchor cable and the clamping piece generate relative displacement to achieve separation of the anchor cable and the clamping piece, the anchor withdrawing process is completed, the problem that due to the fact that the constant-resistance anchor cable normally retracts in the working process and a lock enters a sleeve, the clampin