US 11,085,244 B2Granted

Anti-collapse jet grouting drill bit with bi-directional rib wings, grouting consolidation system and method

AssigneeShandong University

InventorsShucai Li, Qingsong Zhang, Guangming Pan, Rentai Liu, Xiao Zhang, Lei Yang, Kai Wang, Zhaofeng Li, Haitong Sui, Teng Yang, Chunguo Liu

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Abstract

An anti-collapse grouting consolidation system including: a grouting pump; an outer flat drill rod; a drill rig that clamps the outer flat drill rod; a sealing device, sheathed on the outer flat drill rod at the orifice of a drill hole, ensuring the outer flat drill rod is sealed with the orifice of the drill hole; and a jet grouting drill bit with bi-directional rib wings. The grouting pump jets slurry into the drill hole in a static osmotic manner through the jet grouting drill bit. A method of using an anti-collapse grouting consolidation system includes, among other things, injecting quick-setting slurry; sealing an orifice hole of the drill hole by an orifice sealing device; and keeping an anti-collapse jet grouting drill bit with bi-directional rib wings repeatedly moving up and down and rotating at a repair segment to repair the repair segment.

Claims15

Dependent claims

An anti-collapse grouting consolidation system, comprising:

a grouting pump;
a high-pressure pipeline, connected with the grouting pump;
an outer flat drill rod, connected with the high-pressure pipeline;
a drill rig, wherein the outer flat drill rod penetrates through an inner through bore of a chuck of the drill rig, and the chuck of the drill rig clamps the outer flat drill rod;
an orifice sealing device, configured to be sheathed on the outer flat drill rod at an orifice of a drill hole to ensure that the outer flat drill rod is sealed with the orifice of the drill hole, the orifice sealing device comprising:
a pipe protection flange, connected with an orifice pipe;
an inner bushing arranged in the orifice pipe and an inner bushing bottom holder, wherein an inner bushing flange is arranged at an upper port of the inner bushing, a lower end of the inner bushing is connected with the inner bushing bottom holder, and the inner bushing bottom holder is disc-shaped and is provided in a center of the inner bushing bottom holder with a circular hole through which the outer flat drill rod passes;
a water seal, disposed in the inner bushing, and configured to seal a clearance between the outer flat drill rod and the inner bushing, wherein a water inlet pipe and a high-pressure valve connected with the water inlet pipe are arranged on the water seal;
and
a gland flange configured to limit expansion of the water seal after water injection, wherein a degree of sealing of the orifice sealing device is controlled by adjusting a quantity of water, injected into the water seal, to adapt to corresponding situations for different sealing requirements of the drill hole;
and
a jet grouting drill bit with bi-directional rib wings, connected with a one-way valve which is connected with the outer flat drill rod;
wherein:
the grouting pump is configured to jet quick-setting slurry into the drill hole through a high-pressure hose, the outer flat drill rod and the jet grouting drill bit with bi-directional rib wings successively to realize static osmotic jet grouting, and
the drill rig is configured to drive, through the outer flat drill rod, the jet grouting drill bit with bi-directional rib wings to rotate to cut chippings or squeeze the chippings back into a hole wall of the drill hole by means of the jet slurry and rotation of the rib wings so as to repair the hole wall.

12 more elements

A method of using an anti-collapse grouting consolidation system, the method comprising the following steps:

step 1:
feeding a jet grouting drill bit with bi-directional rib wings connected with an outer flat drill rod into a drill hole to a certain depth, sheathing a sealing device outside the outer flat drill rod, fixing the sealing device at the orifice of the drill hole, and connecting the outer flat drill rod to a high-pressure pipeline and a grouting pump successively after the outer flat drill rod passes through a chuck of a drill rig;
step 2:
injecting thin cement slurry into the drill hole to flush the drill hole;
after the drill hole is full of the thin cement slurry, starting the drill rig to ensure the jet grouting drill bit with bi-directional rib wings rotates, and injecting quick-setting slurry, until the quick-setting slurry overflows between the orifice sealing device and the drill rod;
step 3:
sealing the orifice of the drill hole by the orifice sealing device, then conveying the rotating drill bit to a repair segment by the outer flat drill rod, stopping injecting the quick-setting slurry after a grouting pressure reaches a set value, and continuing keeping the anti-collapse jet grouting drill bit with bi-directional rib wings repeatedly moving up and down and rotating at the repair segment to repair the repair segment, until the repair process meets a set requirement;
step 4:
after the repair reaches a setting time, pulling out the outer flat drill rod from the drill hole, so that the jet grouting drill bit with bi-directional rib wings leaves the hole segment that needs grouting reinforcement and drilling repair, and releasing the seal of the sealing device at the orifice;
injecting clear water into the drill hole until the clear water overflows between the orifice sealing device and the outer flat drill rod, stopping the drill rig after the drill bit rotates freely in the drill hole, and detaching the outer flat drill rod at the orifice;
and
step 5:
detaching the orifice sealing device, reconnecting the outer flat drill rod, pumping clear water into the drill hole via the grouting pump, starting the drill rig to rotate slowly and pulling up the outer flat drill rod after the clear water returns from the orifice, therefore, the rib wing at the upper end of the jet grouting drill bit with bi-directional rib wings cuts towards an external direction of the drill hole to clear away the solidified quick-setting slurry in the drill hole, and detaching the outer flat drill rod piece by piece, until the jet grouting drill bit with bi-directional rib wings is lifted out of the drill hole, thus ending the operation steps,
wherein in step 2, a pump volume of the grouting pump is not more than 100 L/min, and a rotating speed of the outer flat drill rod driven by the drill rig is not more than 150 r/min.

11 more elements

A method of using an anti-collapse grouting consolidation system, the method comprising the following steps:

step 1:
feeding a jet grouting drill bit with bi-directional rib wings connected with an outer flat drill rod into a drill hole to a certain depth, sheathing a sealing device outside the outer flat drill rod, fixing the sealing device at an orifice of the drill hole, and connecting the outer flat drill rod to a high-pressure pipeline and a grouting pump successively after the outer flat drill rod passes through a chuck of a drill rig;
step 2:
injecting thin cement slurry into the drill hole to flush the drill hole;
after the drill hole is full of the thin cement slurry, starting the drill rig to ensure the jet grouting drill bit with bi-directional rib wings rotates, and injecting quick-setting slurry, until the quick-setting slurry overflows between the orifice sealing device and the drill rod;
step 3:
sealing the orifice of the drill hole by the orifice sealing device, then conveying the rotating drill bit to a repair segment by the outer flat drill rod, stopping injecting the quick-setting slurry after the grouting pressure reaches a set value, and continuing keeping the anti-collapse jet grouting drill bit with bi-directional rib wings repeatedly moving up and down and rotating at the repair segment to repair the repair segment, until the repair process meets a set requirement;
step 4:
after the repair reaches a setting time, pulling out the outer flat drill rod from the drill hole, so that the jet grouting drill bit with bi-directional rib wings leaves a hole segment that needs grouting reinforcement and drilling repair, and releasing a seal of the sealing device at the orifice;
injecting clear water into the drill hole until the clear water overflows between the orifice sealing device and the outer flat drill rod, stopping the drill rig after the drill bit rotates freely in the drill hole, and detaching the outer flat drill rod at the orifice;
and
step 5:
detaching the orifice sealing device, reconnecting the outer flat drill rod, pumping clear water into the drill hole via the grouting pump, starting the drill rig to rotate slowly and pulling up the outer flat drill rod after the clear water returns from the orifice, therefore, the rib wing at an upper end of the jet grouting drill bit with bi-directional rib wings cuts towards an external direction of the drill hole to clear away the solidified quick-setting slurry in the drill hole, and detaching the outer flat drill rod piece by piece, until the jet grouting drill bit with bi-directional rib wings is lifted out of the drill hole, thus ending the operation steps,
wherein in step 3, the set value of the grouting pressure is 1.0-1.2 MPa;
a rotating speed of the outer flat drill rod driven by the drill rig is not more than 150 r/min;
and an up-down moving speed of the outer flat drill rod is not more than 10 m/min.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/757,681Filed 11 Jul 2016
Priority: CN 201510509181.518 Aug 2015
Published: US 2019/0024460 A124 Jan 2019
Granted: 10 Aug 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

E21B 10/60
Drill bits: characterised by conduits or nozzles for drilling fluids
E02D 3/12
Improving or preserving soil or rock, e.g. preserving permafrost soil: consolidating by placing solidifying or pore-filling substances in the soil
E21B 10/003
Drill bits: with cutting edges facing in opposite axial directions
E21B 10/42
Drill bits: rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits