High Pressure Jet Roofbolter and high pressure jet grouting construction method in geotechnical engineering anchor a high pressure jet grouting anchor construction machinery and high-pressure jet grouting method anchors. Loose sand in the river and waterfront phase phase of the silt layer latest crawler rig, not construction crawler drill anchor light, because: gravel rich in confined water refit crawler drill manufacturer, bolt into the hole hard, sets tube method will produce water will return loop piping, accidents, silt-free anchoring force Chung sand, gushing water, ground subsidence, but to use high cost, long duration, for the inner city have supported method dirty qi. The present invention is to provide a new high-pressure jet grouting bolt rig, bolt rig the pressure rotating jet can vertical, horizontal, diagonal full range of construction Jet anchor piles and anti-floating, tension bolt, the high pressure Churning Roofbolter may be applied not only bigger and straight rotary jet cement anchor bolt head can expand construction. The above object of the present invention is to provide a new kind of high pressure jet grouting bolt rig, bolt high pressure jet grouting construction method to solve the soft soil of silt layer construction without anchoring force can not be the problem, it will be free, in loose gravel soil, in order to lower a hole tendon using casing up method, water will return cycle produces sudden Chung, Chung sand, gushing water, ground subsidence and other accidents. Dual high pressure spraying pile seal Curtain double high-pressure jet grouting Pile Cofferdam construction method, which is suitable for the soil to a depth of 30 to 60m deep water Curtain or foundation reinforcement, the method comprising the steps of: sealing Curtain construction; design parameters; double high pressure spraying pile and select construction parameters. Effects of the present invention is a dual jet grouting method is to increase the plasma pressure in the traditional triple-tube Rotary Spray on, again injection punching the soil to form a larger diameter and filling. Solve the 40 ~ 60m deep foundation treatment over traditional process can not be technical problems into piles, each bite formed by vertical sealing curtain between piles, to be in a deep pit seepage and water proof and foundation reinforcement successfully. Improve the ultra-deep water stop consolidation foundation treatment performance, increases the strength of the pile and impermeability, reduce the construction cost.