Hydraulic control circuit for a construction machine

A hydraulic control circuit for a construction machine, comprising:

• a boom being vertically movably supported by a body and a stick swingably supported at an end part of the boom;
• first and second hydraulic pumps configured to swing the stick in dependence upon extension and contraction operations of a stick cylinder and used as hydraulic supply source;
• and first and second stick spool valves being connected respectively to the first and second hydraulic pumps;
• wherein, first and second poppet valves are provided at an upstream side of the first and second stick spool valves for controlling a poppet valve supply flow rate from the first and second hydraulic pumps to the first and second stick spool valves, the first and second stick spool valves are configured to supply hydraulic flow from the first and second poppet valves to the stick cylinder without increasing or decreasing the poppet valve supply flow rate from the first and second poppet valves, and when the stick cylinder is extended, the first and second poppet valves are configured to control the poppet valve supply flow rate from the first and second hydraulic pumps to a head side oil chamber of the stick cylinder, the first stick spool valve is configured to control a recycled flow rate from a rod side oil chamber of the stick cylinder to the head side oil chamber, the second stick spool valve is configured to control a second stick spool valve discharge flow rate from the rod side oil chamber of the stick cylinder to an oil tank.