CN107288671A - Reinforcing soft broken coal rock body bores the integrated extensible anchor pole of envelope note and its construction method - 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

Drilling, sealing and injecting integration of soft and broken coal and rock mass can connect long bolt and its construction method

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, loose and broken surrounding rock roadways account for 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, so that it has a good bearing capacity. The traditional grouting bolt has complex structure, high cost, and its length is limited by the height and width of the roadway, so the length of the bolt is limited. The technical level of on-site workers is relatively 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 description

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 (7)

1. reinforcing soft broken coal rock body bores the integrated extensible anchor pole of envelope note, it is characterised in that：Including coaxial by front end to rear end The anchor bit set gradually（1）, hollow termination anchor pole（3）, the first anchor rod connection piece（4）, hollow connect anchor pole（5）, second Anchor rod connection piece（8）With jumbolter crossover sub（9）；Anchor bit（1）Rear end stretch into and be threaded in hollow termination Anchor pole（3）Front end inside, the first anchor rod connection piece（4）Leading section and rearward end be respectively protruding into and be threaded in hollow end Head anchor pole（3）Rear end inside and hollow connect anchor pole（5）Front end inside, the second anchor rod connection piece（8）Front end stretch into simultaneously It is threaded in and hollow connects anchor pole（5）Rear end inside, the second anchor rod connection piece（8）Rear end stretch into and be threaded in anchor Bar drill machine crossover sub（9）Front end inside, jumbolter crossover sub（9）Rear portion be with jumbolter be connected six Prism structure（14）, it is hollow to connect anchor pole（5）Rearward end cylindrical be provided with external screw thread.

2. reinforcing soft broken coal rock body according to claim 1 bores the integrated extensible anchor pole of envelope note, it is characterised in that：It is hollow Termination anchor pole（3）Anchor pole is connect with hollow（5）Front portion and rear portion circumferential surface on Central Symmetry be provided with two spanners Neck（6）.

3. reinforcing soft broken coal rock body according to claim 2 bores the integrated extensible anchor pole of envelope note, it is characterised in that：First Anchor rod connection piece（4）With the second anchor rod connection piece（8）Circumferential surface on Central Symmetry be provided with two spanner clamping planes （15）.

4. reinforcing soft broken coal rock body according to claim 3 bores the integrated extensible anchor pole of envelope note and its construction method, its It is characterised by：Anchor bit（1）Inside offer hollow termination anchor pole（3）The through hole of inside connection, hollow termination anchor pole（3）It is outer Circumferential surface is fixedly installed spiral deslagging fin bar（2）.

5. boring the construction method of the integrated extensible anchor pole of envelope note using the reinforcing soft broken coal rock body described in claim 4, it is special Levy and be：Comprise the following steps,

（a）By jumbolter crossover sub（9）Six prism structures（14）It is inserted into the power output interface of jumbolter；

（b）By jumbolter crossover sub（9）With the second anchor rod connection piece（8）Connection, by anchor bit（1）It is screwed to hollow termination Anchor pole（3）Front end, then using the first anchor rod connection piece（4）By hollow termination anchor pole（3）Anchor pole is connect with hollow（5）It is assembled to Required length, then connects anchor pole by hollow（5）Rear end and the second anchor rod connection piece（8）Nose threads connect and tighten； Need to be in drilling process using constantly using the first anchor rod connection piece when required drilling length exceedes span length or height（4） Connection is hollow to connect anchor pole（5）To reach length requirement；

（c）Anchor bit（1）The boring point of alignment settings, starts jumbolter, by step（2）The long anchor pole of middle assembling pierces pine Soft fractured coal and rock connects anchor pole to final section is hollow（5）Rear portion it is exposed to after design length, then remove rig and unload Lower bolt rig crossover sub（9）With the second anchor rod connection piece（8）；

（d）By sealing of hole pallet after scar around cleaning leveling anchor hole（7）It is installed to and hollow connects anchor pole（5）On, it is hollow can Connect anchor pole（5）Rearward end external screw thread on screw on nut（10）And compress sealing of hole pallet（7）, then by slip casting grouting stop-valve door （11）Anchor pole is connect with hollow（5）Rear end connection, slip casting grouting stop-valve door（11）Front end connection grouting pump connecting tube, then open Open slip casting grouting stop-valve door（11）, start grouting pump, slurries are successively by slip casting grouting stop-valve door（11）, hollow connect anchor pole（5）, first Anchor rod connection piece（4）, hollow termination anchor pole（3）And anchor bit（1）Flying barrel between the outer wall of long anchor pole and drilling is injected into afterwards In shape gap, sealing of hole pallet（7）Stop that slurries are excessive in drilling；

（e）Pressure gauge is provided with grouting pump connecting tube, after the pressure on pressure gauge reaches setting value, slip casting grouting stop-valve is closed Door（11）, dismounting grouting pump connecting tube and grouting pump, after removing slip casting grouting stop-valve door after grout cures again（11）, that is, complete long anchor The anchoring construction of bar.

6. construction method according to claim 5, it is characterised in that：Described slip casting grouting stop-valve door（11）The outlet of rear end End is provided with externally threaded slip casting pipe joint（12）, slip casting pipe joint（12）Stretch into and be threaded in and hollow connect anchor pole （5）Rear end inside.

7. construction method according to claim 5, it is characterised in that：Sealing of hole pallet（7）Front end, which is fixedly connected with, to be extend into Hollow rubber plug in drilling（13）, hollow rubber plug（13）Internal diameter, hollow termination anchor pole（3）External diameter and hollow connect anchor Bar（5）External diameter it is equal, hollow rubber plug（13）Excircle be in front fine and rear thick conical structure, hollow rubber plug（13）Before The external diameter of the most taper end of end is equal to the internal diameter of drilling.