Jet grouting apparatus for confined spaces and rapid mobilization requirements

Abstract

A jet grout injection device is provided for depositing liquid grouting materials using a high pressure jet, that is compact and rapidly assembled and powered by an air compressor for safety considerations. An injection pipe and a high pressure swivel are connected with high pressure steel reinforced hydraulic hose to a grout pump. The high pressure swivel can withstand a range of 0-6000 psi. The injection pipe is rotated using two (02) 45° degree miter gears to transfer the rotation from the gear speed reducer. The air motor receives air from a compressor at a range of 0-100 psi and 0-180 cfm, the air motor 4 provides the torque to the gear speed reducer 3 that converts the rotation of the miter gears 1 to low speed 1-3 rpm with high torque. The device allows access to small rooms in subways, for example, that are buried under various structures or even rivers, that would be excessively expensive to access with a drilling rig on the ground surface, especially in urban environments.

1 . A jet grouting device for difficult access locations, comprising:
 a casing pipe is inserted firstly into the ground; then   a rotating injection pipe is inserted into the casing pipe and   a motorized source is connected to the injection pipe for controlled torque and reduced rotation speeds;   a pump is connected to the injection pipe to inject a liquid grout at a specific rate;   wherein both the casing pipe and the injection pipe are lifted as a specific rate during a grouting injection process.   
     
     
         2 . The device in accordance with  claim 1  that rotating injection pipe can be rotated with two 45 degree mitter gears. 
     
     
         3 . The device in accordance with  claim 1  the rotating injection pipe provides grouted columns at angles ranging from vertical to horizontal, in difficult to the difficult access locations. 
     
     
         4 . The device in accordance with  claim 1  that motorized source can provide air power up to 6000 psi, in difficult to access locations. 
     
     
         5 . The device in accordance with  claim 1  that can uniformly repeat the grouting injection process as air power is provided in a controlled manner via a control valve. 
     
     
         6 . An apparatus of high pressure jet grouting device comprising:
 a portable stand comprising a vertical tubular shaft formed upon a base plate having an adjustable shelf;   a clamping means attached thereto to provide a locking and unlocking of adjustable shelf wherein; the shelf is a movable platform providing a mounting means for an air motor with output shaft, reduction gear box and a releasable right angle gear coupling and   a rotating pipe is part of half the right angled gears and is employed to rotate 90° degrees from the adjustable shelf consisting of a mounting bracket below the right angled gears to include a mount for keeping a casing pipe held in place.   
     
     
         7 . The apparatus of a high pressure jet grouting device of  claim 6 , wherein the air motor and reduction gears are attached together with a clamping means consisting essentially of mounting plates bolted together. 
     
     
         8 . The apparatus of a high pressure jet grouting device of  claim 6 , wherein the system comprises:
 an air compressor for supplying high pressure air (4000-6000 psi) through a T splitter which is regulated to send air to the air motor and a grouting pump respectively wherein, the air drives the reduction gears and turns the rotating pipe by the rotation of the right angle gears and air from the compressor is also employed to operate the grouting pump.   
     
     
         9 . The apparatus of a high pressure jet grouting device of  claim 6 , wherein the rotating pipe is a hollow tubular shaft with half of a conical right angle gear assembly attached perpendicular to the rotating pipe whereby the other half of the right angled gear is releasable and attachable to the reduction gears wherein the rotating pipe is rotatable inside a fixed casing pipe whereby a high pressure swivel connector is attached to the upper end portion of the rotating pipe to allow for rotation of only the rotating pipe and not the grouting hose connected thereto. 
     
     
         10 . The apparatus of a high pressure jet grouting device of  claim 9 , wherein the rotating pipe comprises:
 a spray nozzle at the opposite end of the high pressure swivel on the rotating pipe to inject grouting materials supplied from the grouting pump through high pressure swivel connection via the rotating pipe, and to the spray nozzle penetrating the surrounding ground.   
     
     
         11 . The apparatus of a high pressure jet grouting device of  claim 6 , wherein the device consists of one or more manually operated valves disposed after the T splitter valve for controlling the volume of the flowing grouting material and the rotation of the rotating pipe.