CN107288671B - Construction method of soft crushed coal rock mass drilling, sealing and injecting integrated extendable anchor rod - Google Patents

Abstract

Drilling, sealing and injection integration of soft and broken coal and rock mass can be connected to long bolts, including bolt bits arranged in sequence from the front end to the rear end in the same axis, hollow end bolts, first bolt connectors, and hollow connectable bolts , the second anchor rod connector and the rocker drilling rig adapter; the rear end of the rocker drill bit is connected to the front end of the hollow end bolt, and the front end and rear end of the first anchor rod connector are respectively connected to the hollow end bolt The rear end of the second anchor rod connector is connected to the front end of the hollow anchor rod, and the front end and rear end of the second anchor rod connector are respectively connected to the front end of the hollow anchor rod adapter joint. The invention also discloses a construction method for connecting long anchor rods. The invention can not only realize the reinforcement and support of the loose and broken surrounding rocks of the coal mine roadway, but also can be extended to adapt to different ranges of loose and broken areas and can adapt to the surrounding rocks of the roadway. Large deformation, exquisite and reasonable design, simple installation process, mainly suitable for loose and broken areas of coal mine roadways or soft rock roadway reinforcement projects.

Description

Construction method of drilling, sealing and injecting integration of soft and broken coal and rock mass, which can be connected to long bolts

technical field

The invention belongs to the field of support for soft and broken coal and rock masses in coal mine roadways, and in particular relates to a long anchor rod with integration of drilling, sealing and injection for soft and broken coal and rock masses and a construction method thereof.

Background technique

Coal is the main form of energy in my country, and its proportion of primary energy consumption in my country has occupied more than 50% of the share for a long time. Coal mining needs to dig a series of roadways, and an important part of high production and high efficiency in coal mines is the effective support of these roadways. Among the many roadways, due to the influence of mining, geological structure and coal-forming environment, the roadways with loose and broken surrounding rocks occupy a large proportion, and the support is difficult and costly. Under the existing technical conditions, the support method with grouting bolt as the core is mostly used to change the state of the loose and broken surrounding rock of the roadway, making it a complete structure, thus having a good bearing capacity. The traditional grouting anchor has a complex structure, high cost and its length is limited by the height and width of the roadway, so the length of the anchor is limited. The technical level of on-site workers is high, so it cannot be widely used in the support of soft and broken coal and rock mass in coal mine roadways, which leads to the bottleneck problem of such roadway support, threatening the safety of staff and the realization of high production and high efficiency in mines.

Contents of the invention

In order to solve the deficiencies of the prior art, the present invention provides a soft and broken coal and rock body that integrates drilling, sealing and injecting, and can be connected to a long bolt with a simple structure, convenient construction, low cost, reliable support, and can adapt to large deformation of surrounding rocks. and its construction method.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: soft and broken coal and rock mass drilling, sealing and injection integration can be connected to a long anchor rod, including a coaxial anchor drill bit 1, a hollow end anchor Rod 3, the first anchor rod connector 4, the hollow anchor rod 5, the second anchor rod connector 8 and the anchor drill adapter 9; the rear end of the anchor drill bit 1 is inserted and threaded into the hollow end anchor Inside the front end of the rod 3, the front end and the rear end of the first anchor rod connector 4 respectively extend into and are screwed into the rear end inside of the hollow end anchor rod 3 and the front end inside of the hollow connectable anchor rod 5, and the second The front end of the anchor rod connector 8 extends into and is threaded inside the rear end of the hollow connectable anchor rod 5, and the rear end of the second anchor rod connector 8 extends into and is threaded inside the front end of the rocker drill conversion joint 9, The rear portion of the rocker drill conversion joint 9 is a hexagonal prism structure 14 connected with the drive of the rocker driller, and the outer circle of the rear end of the hollow rod 5 that can be connected is provided with an external thread.

Two wrench slots 6 are symmetrically arranged on the front and rear circumferential surfaces of the hollow end anchor rod 3 and the hollow connectable anchor rod 5 .

Two wrench engagement planes 15 are symmetrically arranged on the circumferential surfaces of the first anchor connecting part 4 and the second anchor connecting part 8 .

The anchor drill bit 1 is provided with a through hole through which the hollow end anchor 3 communicates with the inside, and the outer circumferential surface of the hollow end anchor 3 is fixedly provided with a spiral slag discharge rib 2 .

The construction method of drilling, sealing and injecting integration of soft and broken coal and rock mass, which can be connected to a long bolt, comprises the following steps,

(a) Insert the hexagonal prism structure 14 of the rocker drill conversion joint 9 into the power output interface of the rocker drill;

(b) Connect the rocker drill conversion joint 9 with the second rocker connector 8, screw the rocker bit 1 to the front end of the hollow end anchor rod 3, and then use the first anchor rod connector 4 to connect the hollow end anchor rod 3. Assemble with the hollow connectable anchor rod 5 to the required length, then screw the rear end of the hollow connectable anchor rod 5 with the front end of the second anchor rod connector 8 and tighten; when the required drilling length exceeds the roadway width or When the height is high, it is necessary to continuously use the first anchor rod connector 4 to connect the hollow and connectable anchor rod 5 during the drilling process to meet the length requirement;

(c) Align the rock bolt bit 1 with the set drilling point, start the rock bolt machine, and drill the long anchor rod assembled in step 2 into the soft and broken coal rock mass to the rear part of the last section, which is hollow and connectable to the anchor rod 5 After being exposed to the designed length, the drilling rig is then removed and the bolter rig conversion joint 9 and the second bolt connector 8 are removed;

(d) After cleaning and leveling the rock surface around the anchor hole, install the sealing tray 7 on the hollow connectable anchor rod 5, screw the nut 10 on the external thread of the rear end of the hollow connectable bolt 5 and press the seal tightly. Hole tray 7, then connect the grouting stop valve 11 with the rear end of the hollow anchor rod 5, connect the front end of the grouting stop valve 11 to the grouting pump connection pipe, then open the grouting stop valve 11, start the injection Grouting pump, the grout is poured into the outer wall of the long anchor and the drill hole by the grouting stop grout valve 11, the hollow connectable anchor 5, the first anchor connector 4, the hollow end anchor 3 and the anchor drill 1. In the annular gap between the holes, the sealing tray 7 prevents the slurry from overflowing inside and outside the drill hole;

(e) A pressure gauge is installed on the connecting pipe of the grouting pump. When the pressure on the pressure gauge reaches the set value, close the grouting stop valve 11, disassemble the connecting pipe and the grouting pump, and wait until the grout solidifies. Take off the grouting stop grouting valve 11, namely complete the anchoring construction of the long anchor rod.

The outlet end of the rear end of the grouting stop valve 11 is provided with a grouting pipe joint 12 with an external thread, and the grouting pipe joint 12 extends into and is threaded inside the rear end of the hollow anchor rod 5 .

The front end of the sealing tray 7 is fixedly connected with a hollow rubber plug 13 extending into the drilled hole. The inner diameter of the hollow rubber plug 13, the outer diameter of the hollow end anchor rod 3 and the outer diameter of the hollow connectable anchor rod 5 are equal. The outer circumference of the plug 13 is a conical structure that is thinner at the front and thicker at the back, and the outer diameter of the thinnest end of the front end of the hollow rubber plug 13 is equal to the inner diameter of the drilled hole.

Adopt above-mentioned technical scheme, the present invention has following technical effect with respect to prior art:

1. The grouting stop valve in the present invention is a recyclable component, which can save costs compared with traditional grouting anchors.

2. The long anchor rod body of the present invention includes a hollow end anchor rod and a hollow connectable anchor rod (the standard length of which is 1.0m, which can be reasonably assembled using the first anchor rod connector according to the width of the surrounding rock loose crushing area. Compared with the traditional grouting bolt, it has a wider application range, and because of the high strength and high elongation steel material, coupled with the high elongation of the extension part, the rod body has good elongation after anchoring, so that it can adapt to the large deformation of the surrounding rock.

3. The sealing tray of the present invention is a hollow rubber plug of a certain length added on the basis of the traditional sealing tray. When the nut presses the sealing tray, the hollow rubber plug is pressed into the hole of the drilled hole, and the hollow rubber The outer circumference of the plug is a conical structure that is thinner at the front and thicker at the back. The tighter the nut is pressed against the sealing tray, the stronger the sealing performance will be. This can fully improve the sealing effect and solve the problem of the traditional grouting bolt sealing process.

4. All components in the present invention are connected by threads, which not only facilitates split manufacturing, but also facilitates assembly.

5. The long anchor rod in the present invention not only has the function of drill pipe drilling, but also has the function of sealing pipe. time and save construction costs.

In summary, the present invention can not only realize the reinforcement and support of the loose and broken surrounding rock of the coal mine roadway, but also can be extended to adapt to different loose broken area ranges and can adapt to the large deformation of the roadway surrounding rock, and the bolt can be drilled into the rock mass Afterwards, it is used as a grouting bolt. The design is exquisite and reasonable, and the installation process is simple. It solves the problems of complex construction technology and complex structure of the traditional grouting bolt support. It is mainly suitable for loose and broken areas of coal mine roadways or soft rock roadway reinforcement projects.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the three-dimensional structure schematic diagram of the grouting stop grouting valve in the present invention;

Fig. 3 is a three-dimensional structural schematic diagram of a rocker drilling rig conversion joint in the present invention;

Fig. 4 is the schematic diagram of the three-dimensional structure of the hollow end anchor rod in the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure of the hollow connectable anchor rod in the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the sealing tray in the present invention;

Fig. 7 is a structural schematic diagram of the rock-bolt drill bit in the present invention.

Detailed ways

As shown in Figures 1 to 7, the soft and broken coal and rock mass drilling, sealing and injection integration of the present invention can be connected to a long anchor rod, and the soft and broken coal and rock mass drilling and sealing and injection integration can be extended. Bolt drill bit 1, hollow end bolt 3, first bolt connector 4, hollow connectable bolt 5, second bolt connector 8 and rocker drill conversion joint 9 arranged in sequence to the rear end; The rear end of the drill bit 1 extends into and is threaded inside the front end of the hollow end anchor rod 3, and the front end and the rear end of the first anchor rod connector 4 respectively extend into and thread connected to the rear end of the hollow end anchor rod 3. end inside and the front end of the hollow connectable anchor rod 5, the front end of the second anchor rod connector 8 extends into and is screwed into the rear end inside of the hollow connectable anchor rod 5, and the rear end of the second anchor rod connector 8 extends Inserted and threaded inside the front end of the rocker drill conversion joint 9, the rear part of the rocker drill conversion joint 9 is a hexagonal prism structure 14 connected with the drive of the rocker drill machine, and the outer circle of the rear end of the hollow bolt 5 can be connected With external thread.

Two wrench slots 6 are symmetrically arranged on the front and rear circumferential surfaces of the hollow end anchor rod 3 and the hollow connectable anchor rod 5 .

Two wrench engagement planes 15 are symmetrically arranged on the circumferential surfaces of the first anchor connecting part 4 and the second anchor connecting part 8 . Both the wrench clamping groove 6 and the wrench clamping plane 15 are used for the worker to perform axial screw connection after clamping with a wrench.

The anchor drill bit 1 is provided with a through hole through which the hollow end anchor 3 communicates with the inside, and the outer circumferential surface of the hollow end anchor 3 is fixedly provided with a spiral slag discharge rib 2 .

The construction method for the integration of drilling, sealing and injection of soft and broken coal and rock mass of the present invention, which can be connected to a long anchor rod, comprises the following steps,

(a) Insert the hexagonal prism structure 14 of the rocker drill conversion joint 9 into the power output interface of the rocker drill;

(b) Connect the rocker drill conversion joint 9 with the second rocker connector 8, screw the rocker bit 1 to the front end of the hollow end anchor rod 3, and then use the first anchor rod connector 4 to connect the hollow end anchor rod 3. Assemble with the hollow connectable anchor rod 5 to the required length, then screw the rear end of the hollow connectable anchor rod 5 with the front end of the second anchor rod connector 8 and tighten; when the required drilling length exceeds the roadway width or When the height is high, it is necessary to continuously use the first anchor rod connector 4 to connect the hollow and connectable anchor rod 5 during the drilling process to meet the length requirement;

(c) Align the rock bolt bit 1 with the set drilling point, start the rock bolt machine, and drill the long anchor rod assembled in step 2 into the soft and broken coal rock mass to the rear part of the last section, which is hollow and connectable to the anchor rod 5 After being exposed to the designed length, the drilling rig is then removed and the bolter rig conversion joint 9 and the second bolt connector 8 are removed;

(d) After cleaning and leveling the rock surface around the anchor hole, install the sealing tray 7 on the hollow connectable anchor rod 5, screw the nut 10 on the external thread of the rear end of the hollow connectable bolt 5 and press the seal tightly. Hole tray 7, then connect the grouting stop valve 11 with the rear end of the hollow anchor rod 5, connect the front end of the grouting stop valve 11 to the grouting pump connection pipe, then open the grouting stop valve 11, start the injection Grouting pump, the grout is poured into the outer wall of the long anchor and the drill hole by the grouting stop grout valve 11, the hollow connectable anchor 5, the first anchor connector 4, the hollow end anchor 3 and the anchor drill 1. In the annular gap between the holes, the sealing tray 7 prevents the slurry from overflowing inside and outside the drill hole;

(e) A pressure gauge is installed on the connecting pipe of the grouting pump. When the pressure on the pressure gauge reaches the set value, close the grouting stop valve 11, disassemble the connecting pipe and the grouting pump, and wait until the grout solidifies. Take off the grouting stop grouting valve 11, namely complete the anchoring construction of the long anchor rod.

The outlet end of the rear end of the grouting stop valve 11 is provided with a grouting pipe joint 12 with an external thread, and the grouting pipe joint 12 extends into and is threaded inside the rear end of the hollow anchor rod 5 .

The front end of the sealing tray 7 is fixedly connected with a hollow rubber plug 13 extending into the drilled hole. The inner diameter of the hollow rubber plug 13, the outer diameter of the hollow end anchor rod 3 and the outer diameter of the hollow connectable anchor rod 5 are equal. The outer circumference of the plug 13 is a conical structure that is thinner at the front and thicker at the back, and the outer diameter of the thinnest end of the front end of the hollow rubber plug 13 is equal to the inner diameter of the drilled hole.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention belong to the protection of the technical solution of the present invention. scope.

Claims (3)

1. The construction method of the soft crushed coal rock mass drilling, sealing and injecting integrated extendable anchor rod is characterized in that: the soft crushed coal rock mass drilling, sealing and injecting integrated extendable anchor rod comprises an anchor rod drill bit (1), a hollow end anchor rod (3), a first anchor rod connecting piece (4), a hollow extendable anchor rod (5), a second anchor rod connecting piece (8) and an anchor rod drilling machine adapter (9) which are coaxially and sequentially arranged from the front end to the rear end; the rear end of an anchor rod drill bit (1) stretches into and is in threaded connection with the interior of the front end of a hollow end anchor rod (3), the front end part and the rear end part of a first anchor rod connecting piece (4) respectively stretch into and are in threaded connection with the interior of the rear end of the hollow end anchor rod (3) and the interior of the front end of a hollow connectable anchor rod (5), the front end of a second anchor rod connecting piece (8) stretches into and is in threaded connection with the interior of the rear end of the hollow connectable anchor rod (5), the rear end of the second anchor rod connecting piece (8) stretches into and is in threaded connection with the interior of the front end of an anchor rod drilling machine conversion joint (9), the rear part of the anchor rod drilling machine conversion joint (9) is of a hexagonal prism structure (14) in transmission connection with an anchor rod drilling machine, and the excircle of the rear end part of the hollow connectable anchor rod (5) is provided with an external thread;

two wrench clamping grooves (6) are arranged on the circumferential surfaces of the front part and the rear part of the hollow end anchor rod (3) and the hollow connectable anchor rod (5) in a centrosymmetric manner;

two wrench clamping planes (15) are arranged on the circumferential surfaces of the first anchor rod connecting piece (4) and the second anchor rod connecting piece (8) in a centrosymmetric manner;

a through hole communicated with the interior of the hollow end anchor rod (3) is formed in the anchor rod drill bit (1), and a spiral slag-discharging convex rib (2) is fixedly arranged on the outer circumferential surface of the hollow end anchor rod (3);

the construction method comprises the following steps of,

(a) Inserting the hexagonal prism structure (14) of the conversion joint (9) of the anchor drilling machine into a power output interface of the anchor drilling machine;

(b) Connecting an adapter (9) of an anchor rod drilling machine with a second anchor rod connecting piece (8), screwing an anchor rod drill bit (1) to the front end of a hollow end anchor rod (3), assembling the hollow end anchor rod (3) and a hollow connectable anchor rod (5) to a required length by using a first anchor rod connecting piece (4), and then connecting and screwing the rear end of the hollow connectable anchor rod (5) and the front end of the second anchor rod connecting piece (8) in a threaded manner; when the required drilling length exceeds the width or the height of a roadway, a first anchor rod connecting piece (4) is continuously adopted to be connected with a hollow connectable anchor rod (5) in the drilling process so as to meet the length requirement;

(c) Aligning the anchor rod drill bit (1) to a set drilling point, starting an anchor rod drilling machine, drilling the long anchor rod assembled in the step (2) into the soft crushed coal rock body until the rear part of the last hollow connectable anchor rod (5) is exposed to the designed length, then taking down the drilling machine, and detaching the adapter (9) and the second anchor rod connecting piece (8) of the anchor rod drilling machine;

(d) Cleaning and leveling rock surfaces around an anchoring hole, installing a hole sealing tray (7) on a hollow connectable anchor rod (5), screwing a nut (10) on an external thread at the rear end part of the hollow connectable anchor rod (5) and pressing the hole sealing tray (7), then connecting a grouting stop valve (11) with the rear end of the hollow connectable anchor rod (5), connecting the front end of the grouting stop valve (11) with a grouting pump connecting pipe, then opening the grouting stop valve (11), starting a grouting pump, injecting grout into a flying ring-shaped gap between the outer wall of a long anchor rod and a drill hole after sequentially passing through the grouting stop valve (11), the hollow connectable anchor rod (5), a first anchor rod connecting piece (4), the hollow end anchor rod (3) and an anchor rod drill bit (1), and blocking the grout from overflowing inside and outside the drill hole by the hole sealing tray (7);

(e) And a pressure gauge is arranged on the grouting pump connecting pipe, when the pressure on the pressure gauge reaches a set value, the grouting stop valve (11) is closed, the grouting pump connecting pipe and the grouting pump are disassembled, and the grouting stop valve (11) is taken down after the grout is solidified, so that the anchoring construction of the long anchor rod is completed.

2. The construction method according to claim 1, characterized in that: the outlet end of the rear end of the grouting stop valve (11) is provided with a grouting pipe joint (12) with external threads, and the grouting pipe joint (12) extends into the hollow connectable anchor rod (5) and is in threaded connection with the inside of the rear end of the hollow connectable anchor rod (5).

3. The construction method according to claim 2, wherein: hole sealing tray (7) front end fixedly connected with stretches into hollow rubber stopper (13) in the drilling, and the internal diameter of hollow rubber stopper (13), the external diameter of hollow end stock (3) and the external diameter that cavity can connect stock (5) equal, and the outer circumference of hollow rubber stopper (13) is the thick conical structure in thin back in the front, and the external diameter of the thinnest end of hollow rubber stopper (13) preceding tip equals the internal diameter of drilling.

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