CN112878902A - Drilling tool for crossing pebble stratum - Google Patents

Abstract

For the technical problem that the drill bit is easy to fall off when penetrating through a water-rich pebble stratum, the invention provides the technical idea of arranging the wall protecting section type separating device, wherein the pebble stratum is separated from the inside of a drill hole through the wall protecting section, and the drill bit is protected from continuously drilling downwards. Furthermore, the invention designs a pluggable drilling tool with a wall protection section, so that the wall protection section is retained when the drilling tool drills into a pebble stratum, and the power section is carried. The through holes arranged on the wall protecting section can be used as a channel for extracting water in the water-rich pebble stratum and a channel for grouting and filling; the wall protecting section is provided with a drilling part to ensure that the wall protecting section has drilling capacity, and when the wall protecting section drills in a pebble stratum, pebbles can enter the wall protecting section, so that an internal drilling system comprising an inner drill rod, a wing-shaped knife wing and a pilot bit is arranged, and the pebbles in the wall protecting section can be crushed; the arranged wing-shaped blades can play a role in crushing pebbles; and because the size of the wall protection section is far larger than that of the traditional drill bit, the drill drop phenomenon cannot occur.

Description

Drilling tool for crossing pebble stratum

Technical Field

The invention belongs to the field of municipal construction, and relates to a drilling tool for penetrating through a pebble stratum.

Background

Municipal works generally refer to the arrangement of various buildings and structures in the planned construction range of urban areas, and the necessary condition is to ensure the stability of the foundation during construction. The foundation refers to the soil or rock mass supported under the building, and the foundation does not belong to the building component, but has very important function for ensuring the firmness and durability of the building. The foundation has enough bearing capacity, the settlement of the foundation needs to be controlled within a certain range, and the foundation has the capability of preventing overturning and instability, so the foundation needs to be reinforced before ground building construction.

The water-rich pebble stratum in the foundation is always the key and difficult area for foundation reinforcement, and generally speaking, the water-rich pebble stratum is reinforced by injecting filling materials, such as cement paste, into the water-rich pebble stratum through ground drilling. However, when two layers of water-rich pebble strata are encountered, the drilling tool needs to pass through the upper layer of pebble strata to reinforce the lower layer of pebble strata, and the drilling tool easily generates a drill holding phenomenon when passing through the pebble strata, so that the drilling tool cannot be lifted, and the drill hole is scrapped, so that the drilling tool capable of passing through the water-rich pebble strata is urgently needed to solve the problem of reinforcing the two layers of pebble strata.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a drilling tool for penetrating a water-rich pebble stratum, which comprises a power section and a retaining wall section, wherein the power section and the retaining wall section are coaxially arranged and are connected in a pluggable manner; the power section comprises a drill rod connecting section, a horn-shaped transition section and an upper connecting section from top to bottom, wherein the diameter of the upper connecting section is larger than that of the drill rod connecting section, the upper part of the drill rod connecting section is connected with the drill rod, and the upper connecting section is connected with a lower connecting part at the upper end of the retaining wall section in a pluggable manner through an upper connecting part at the lower end of the upper connecting section; a support frame is horizontally arranged in the transition section, a driving motor is fixed on the support frame, and an output shaft of the driving motor is connected with an inner drill rod; a plurality of layers of wing-shaped blades are uniformly arranged on the inner drill rod extending into the wall protecting section from top to bottom, more than 2 blades are uniformly arranged on each layer, and the lower part of each layer is connected with a pilot drill bit; the bottom end of the pilot drill bit is higher than the bottom end of the wall protecting section; the dado section includes top-down's lower connecting portion, dado section of thick bamboo and a plurality of portion of creeping into, evenly is provided with the through-hole on the dado section of thick bamboo, and each portion of creeping into is along dado section of thick bamboo circumference interval, evenly sets up.

Preferably, the device for fixing the inner drill rod is arranged in the upper connecting section, and comprises a bearing coaxially fixed on the inner drill rod, a fixed block fixed on the inner wall of the upper connecting section, and one end of a horizontally arranged support rod and one end of a bearing outer ring fixedly connected with the fixed block are fixedly connected with the fixed block.

Preferably, the inner drill rod in the upper connecting section is uniformly provided with a plurality of layers of wing-shaped blades from top to bottom, and each layer is uniformly provided with more than 2 blades.

Preferably, the lower connecting part comprises a connecting table connected with the top end of the retaining wall cylinder, the outer ring of the connecting table is connected with the retaining wall cylinder, the inner ring of the connecting table is connected with the bottom end of the connecting cylinder, and the outer wall of the connecting cylinder is axially provided with convex plates at intervals; even, the interval cutting has the spread groove that matches with the protrusion board on the pipe wall of going up connecting portion, the protrusion board can be blocked to the spread groove, and the connecting cylinder can insert in the hollow connecting portion of going up.

Preferably, each drilling part comprises a blade block arranged on the outer periphery of the retaining wall cylinder and a blade block arranged on the inner periphery of the retaining wall cylinder; two rows of second drill teeth are axially arranged on the outer side face of each blade wing block, a plurality of second drill teeth are arranged on the lower end face of each arc-shaped blade wing block along the arc-shaped central line of the lower end face of each arc-shaped blade wing block, and the circle where the second drill teeth of the lower end face of each drilling part are located and the wall protection cylinder are concentric circles.

The drilling method for penetrating through the water-rich pebble stratum by adopting the drilling tool comprises the following construction steps: s1, connecting a drill rod by using a conventional drill bit, constructing a plurality of drill holes from the ground to the water-rich pebble stratum, and lifting the drill holes after the drill holes are drilled to the upper water-rich pebble stratum;

s2, connecting the drilling tool penetrating through the water-rich pebble stratum with a drill rod, and drilling along an original drilling hole until the drilling is carried out to a certain depth of a bottom plate stratum of the upper water-rich pebble stratum, wherein the top end of the wall protection cylinder is positioned in a certain range in a top plate stratum of the upper water-rich pebble stratum;

s3, starting the driving motor, and simultaneously extracting water in the upper water-rich pebble stratum from the interior of the drill rod;

s4, lifting the drill, and reserving the wall protecting section at the lower part in the water-rich pebble stratum at the upper part;

s5, injecting the fly ash slurry, and injecting cement slurry after the pressure is increased;

s6, connecting a drill rod by using a conventional drill bit, and continuously drilling along the original drill hole until the drill hole reaches the water-rich pebble stratum at the lower part; lifting the drill, pumping water, grouting, wherein the grouting method is the same as the step S5;

and S7, placing a steel reinforcement cage into the drill hole, and pouring cement paste to form a reinforced cement pile for reinforcing the foundation.

The beneficial technical effects of the invention are as follows:

1. for the technical problem that the drill bit is easy to fall off when penetrating through a water-rich pebble stratum, the invention provides the technical idea of arranging the wall protecting section type separating device, wherein the pebble stratum is separated from the inside of a drill hole through the wall protecting section, and the drill bit is protected from continuously drilling downwards. Furthermore, the invention designs a pluggable drilling tool with a wall protection section, so that the wall protection section is retained when the drilling tool drills into a pebble stratum, and the power section is carried to the outside, and the power section can be recycled. The through holes arranged on the wall protecting section can be used as a channel for extracting water in the water-rich pebble stratum and a channel for grouting and filling; the wall protecting section is provided with a drilling part to ensure that the wall protecting section has drilling capacity, and pebbles can enter the wall protecting section when drilling a pebble stratum, so that an internal drilling system comprising an inner drill rod, a wing-shaped knife wing and a pilot bit is arranged, and the pebbles in the wall protecting section can be crushed (if the pebbles in the wall protecting section are not crushed, the subsequent drilling still can cause the problem of drill falling); the wing-shaped blades can break pebbles (similar to the working principle of a soybean milk machine and a wall breaking machine). And because the size of the wall protection section is far larger than that of the traditional drill bit, the drill drop phenomenon can not occur (the drill bit is smaller relative to the pebble block and is easy to drop, and the wall protection cylinder is larger relative to the pebble and is not easy to drop).

2. Because the cobbles are arranged inside and outside the retaining wall cylinder, and the cobbles are possibly uneven in shape and size, the forces acting on the inner wall and the outer wall of the retaining wall cylinder are different, so the retaining wall cylinder is very easy to deflect by the acting force of the cobbles in the drilling process; aiming at the problem, the inner wall and the outer wall of the retaining wall cylinder are both provided with the cutter wing blocks, the side surfaces of the cutter wing blocks are both provided with the drill teeth, and the lower end surfaces of the cutter wing blocks are also provided with the drill teeth, so that pebbles (possibly contacted) around the retaining wall cylinder can be completely broken to provide an unobstructed space for downward drilling. In addition, because the pebbles in the protecting wall section are crushed after being in place below the protecting wall section, the upper connecting section can play a role in storing the pebbles and prevent the protecting wall section from being assembled (the wing-shaped knife wing penetrates through the protecting wall section to generate broken expansion).

Drawings

Figure 1 is a cross-sectional view of a drilling system of the present invention traversing a two-layered pebble formation.

Fig. 2 is a drilling tool of the present invention.

Fig. 3 is a block diagram of a drilling tool attachment portion of the present invention.

In the figure, the drilling system 00; an upper water-rich pebble formation 01; a lower water-rich pebble formation 02; a drill rod 03; a power section 1; a drill rod connection section 11; a transition section 12, an upper connection section 13; a driving motor 141; a support frame 142; an inner drill rod 143; a bearing 151; a fixed block 152; a support rod 153; a wing-like blade 16; a pilot bit 17; an upper connecting portion 18; a connecting groove 181; a wall protecting section 2; a lower connecting portion 21; a connecting table 211; a connecting cylinder 212; a projection plate 213; a wall-protecting cylinder 22; a through-hole 221; the wing blocks 231; second drilling teeth 232.

Detailed Description

Referring to fig. 2-3, a drilling tool for penetrating a water-rich pebble stratum comprises a power section 1 and a retaining wall section 2 which are coaxially arranged and can be connected in a plugging manner; the power section 1 comprises a drill rod connecting section 11, a horn-shaped transition section 12 and an upper connecting section 13 from top to bottom, wherein the diameter of the upper connecting section 13 is larger than that of the drill rod connecting section 11, the upper part of the drill rod connecting section 11 is connected with a drill rod 03, and the upper connecting section 13 is connected with a lower connecting part 21 at the upper end of the dado section 2 in a pluggable manner through an upper connecting part 18 at the lower end of the upper connecting section; a support frame 142 is horizontally arranged in the transition section 12, a driving motor 141 is fixed on the support frame 142, and an output shaft of the driving motor is connected with an inner drill rod 143; a plurality of layers of wing-shaped blades 16 are uniformly arranged on the inner drill rod 143 extending into the wall protecting section 2 from top to bottom, more than 2 wing-shaped blades 16 are uniformly arranged on each layer, and the lower part of each layer is connected with a pilot drill bit 17; the bottom end of the pilot bit 17 is higher than the bottom end of the protective wall section 2; the dado section includes lower connecting portion 21, dado section of thick bamboo 22 and a plurality of drilling portion of top-down, evenly is provided with through-hole 221 on the dado section of thick bamboo, and each drilling portion is along the circumferential interval of dado section of thick bamboo 22, evenly sets up.

Preferably, a device for fixing the inner drill rod 143 is disposed inside the upper connecting section 13, and includes a bearing 151 coaxially fixed on the inner drill rod 143, a fixing block 152 fixed on the inner wall of the upper connecting section 13, and one end of a horizontally disposed support rod 153 fixedly connected to the outer ring of the bearing 151 and the other end fixedly connected to the fixing block 152.

Preferably, a plurality of layers of wing-shaped blades 16 are uniformly arranged on the inner drill rod 143 inside the upper connecting section 13 from top to bottom, and more than 2 wing-shaped blades 16 are uniformly arranged on each layer.

Preferably, the lower connecting portion 21 comprises a connecting platform 211 connected with the top end of the retaining wall cylinder 22, the outer ring of the connecting platform 211 is connected with the retaining wall cylinder 22, the inner ring of the connecting platform 211 is connected with the bottom end of the connecting cylinder 212, and the outer wall of the connecting cylinder 212 is provided with protruding plates 213 at intervals in the axial direction; the pipe wall of the upper connecting part 18 is evenly and alternately cut with connecting grooves 181 matched with the convex plates 213, the connecting grooves 181 can clamp the convex plates 213, and the connecting cylinder 212 can be inserted into the hollow upper connecting part 18.

Preferably, the diameter of the upper connector 18 is greater than the diameter of the connector barrel 212 and less than the diameter of the wall guard barrel 22.

Preferably, each drilling portion includes a blade block 231 disposed at an outer periphery of the retaining wall cylinder 22 and a blade block 231 disposed at an inner periphery of the retaining wall cylinder; two rows of second drilling teeth 232 are axially arranged on the outer side surface (relative to the retaining wall cylinder 22) of each blade wing block 231, a plurality of second drilling teeth 232 are arranged on the lower end surface of each arc-shaped blade wing block 231 along the arc-shaped central line of the blade wing block, and the circle of the second drilling teeth on the lower end surface of all drilling parts is concentric with the retaining wall cylinder 22.

Preferably, the drive motor 141 is powered by a cable, which is arranged inside the drill rod 03.

The drilling method for penetrating through the water-rich pebble stratum by adopting the drilling tool comprises the following construction steps: s1, in the foundation stabilization area, connecting a drill rod 03 by using a conventional drill bit, constructing a plurality of drill holes from the ground to the water-rich pebble stratum, lifting the drill after drilling the upper water-rich pebble stratum 01, and unloading the conventional drill bit;

preferably, the bore diameter is smaller than the outer diameter of the wall protection cylinder;

s2, connecting the upper part of the drill rod connecting section 11 of the drilling tool penetrating through the water-rich pebble stratum with a drill rod 03, drilling along the original drilled hole, cutting pebbles in the upper water-rich pebble stratum 01 by a drilling part until the pebbles are drilled into a bottom plate stratum of the upper water-rich pebble stratum 01 to a certain depth, and positioning the top end of the wall protection cylinder 22 in a certain range in a top plate stratum of the upper water-rich pebble stratum 01;

s3, starting an internal drilling system, namely starting the driving motor 141 to drive the inner drill rod 143 to rotate, and driving the wing-shaped blades 16 to break pebbles in the drilling tool; meanwhile, water in the upper water-rich pebble stratum 01 is extracted from the interior of the drill rod, and the water is pumped to the ground surface together with the cut pebble rock debris;

preferably, when the water discharged to the surface does not contain pebble rock chips, the driving motor 141 is turned off;

s4, lifting the drill, wherein the power section 1 is lifted to the ground along with the drill rod 03, and the wall protecting section 2 at the lower part is left in the upper water-rich pebble stratum 01, so that the upper water-rich pebble stratum 01 is communicated with the inner space of the drill hole only through the through hole 221;

s5, grouting, namely installing a wellhead device at the orifice, wherein the wellhead device adopts a three-way structure, the upper path is connected with a pressure gauge, the lower path is connected with a drill hole, the horizontal path is connected with a grouting pipeline, and grouting is carried out after the installation is finished;

preferably, the slurry injected first is fly ash slurry, and when the pressure is increased, cement slurry is injected;

s6, after grouting, connecting the drill rod 03 with a conventional drill bit, and continuing drilling along the original drill hole, wherein the drill bit penetrates through the upper water-rich pebble stratum 01 from the inside under the protection of the wall protecting section 2 until drilling to the lower water-rich pebble stratum 02; lifting the drill, and extracting water in the water-rich pebble stratum 02 at the lower part; grouting, wherein the grouting method is the same as the step S5;

and S7, after grouting, placing a reinforcement cage into the drilled hole, and pouring cement paste to form a reinforced cement pile for reinforcing the foundation.

Claims (6)

1. A drilling tool for penetrating through a water-rich pebble stratum comprises a power section and a retaining wall section, wherein the power section and the retaining wall section are coaxially arranged and are connected in a pluggable mode; the power section comprises a drill rod connecting section, a horn-shaped transition section and an upper connecting section from top to bottom, wherein the diameter of the upper connecting section is larger than that of the drill rod connecting section, the upper part of the drill rod connecting section is connected with the drill rod, and the upper connecting section is connected with a lower connecting part at the upper end of the retaining wall section in a pluggable manner through an upper connecting part at the lower end of the upper connecting section; a support frame is horizontally arranged in the transition section, a driving motor is fixed on the support frame, and an output shaft of the driving motor is connected with an inner drill rod; a plurality of layers of wing-shaped blades are uniformly arranged on the inner drill rod extending into the wall protecting section from top to bottom, more than 2 blades are uniformly arranged on each layer, and the lower part of each layer is connected with a pilot drill bit; the bottom end of the pilot drill bit is higher than the bottom end of the wall protecting section; the dado section includes top-down's lower connecting portion, dado section of thick bamboo and a plurality of portion of creeping into, evenly is provided with the through-hole on the dado section of thick bamboo, and each portion of creeping into is along dado section of thick bamboo circumference interval, evenly sets up.

2. The method for constructing the foundation of the municipal engineering according to claim 1, wherein the means for fixing the inner drill rod is provided inside the upper connecting section, and comprises a bearing coaxially fixed on the inner drill rod, a fixing block fixed on the inner wall of the upper connecting section, and one end of the horizontally disposed support rod is fixedly connected with the outer ring of the bearing and the other end is fixedly connected with the fixing block.

3. The drilling tool for penetrating through the water-rich pebble stratum according to claim 1, wherein a plurality of layers of wing-shaped blades are uniformly arranged on the inner drill rod in the upper connecting section from top to bottom, and more than 2 blades are uniformly arranged on each layer.

4. The drilling tool for penetrating through a water-rich pebble formation according to claim 1, wherein the lower connecting part comprises a connecting table connected with the top end of the retaining wall cylinder, the outer ring of the connecting table is connected with the retaining wall cylinder, the inner ring of the connecting table is connected with the bottom end of the connecting cylinder, and the outer wall of the connecting cylinder is provided with protruding plates at intervals in the axial direction; even, the interval cutting has the spread groove that matches with the protrusion board on the pipe wall of going up connecting portion, the protrusion board can be blocked to the spread groove, and the connecting cylinder can insert in the hollow connecting portion of going up.

5. A drilling tool for penetrating a water-rich pebble formation according to claim 1, wherein each drilling part preferably comprises a blade block arranged on the outer periphery of the retaining wall cylinder and a blade block arranged on the inner periphery of the retaining wall cylinder; two rows of second drill teeth are axially arranged on the outer side face of each blade wing block, a plurality of second drill teeth are arranged on the lower end face of each arc-shaped blade wing block along the arc-shaped central line of the lower end face of each arc-shaped blade wing block, and the circle where the second drill teeth of the lower end face of each drilling part are located and the wall protection cylinder are concentric circles.

6. A method of drilling through a pebble bed using a drilling tool as claimed in any one of claims 1 to 5, comprising the steps of: s1, connecting a drill rod by using a conventional drill bit, constructing a plurality of drill holes from the ground to the water-rich pebble stratum, and lifting the drill holes after the drill holes are drilled to the upper water-rich pebble stratum;

s2, connecting the drilling tool penetrating through the water-rich pebble stratum with a drill rod, and drilling along an original drilling hole until the drilling is carried out to a certain depth of a bottom plate stratum of the upper water-rich pebble stratum, wherein the top end of the wall protection cylinder is positioned in a certain range in a top plate stratum of the upper water-rich pebble stratum;

s3, starting the driving motor, and simultaneously extracting water in the upper water-rich pebble stratum from the interior of the drill rod;

s4, lifting the drill, and reserving the wall protecting section at the lower part in the water-rich pebble stratum at the upper part;

s5, injecting the fly ash slurry, and injecting cement slurry after the pressure is increased;

s6, connecting a drill rod by using a conventional drill bit, and continuously drilling along the original drill hole until the drill hole reaches the water-rich pebble stratum at the lower part; lifting the drill, pumping water, grouting, wherein the grouting method is the same as the step S5;

and S7, placing a steel reinforcement cage into the drill hole, and pouring cement paste to form a reinforced cement pile for reinforcing the foundation.

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