CN108590720A - Continue resigning erosion control support anchor rod and its setting method for bump tunnel - Google Patents

Abstract

The invention belongs to the field of anti-scouring support bolts, and in particular relates to a continuous yielding anti-scourt support bolt for impact rock roadways and a setting method thereof. The anchor rod includes a high-strength threaded anchor rod main body, an anchor rod connecting screw, a continuous abdication anti-scourrence energy-absorbing device, an outer cylinder and a metal plate; the setting method is: 1) drilling a hole on the roadway wall; 2) Set the outer cylinder in the hole; 3) send the main body of the high-strength threaded anchor rod into the outer cylinder; 4) connect the screw through the anchor rod, and connect the continuous abdication anti-shock energy-absorbing component to the high-strength threaded anchor rod The tail ends of the main body are connected; 5) During the deformation process of the roadway wall, according to different situations, the continuous abdication anti-scourrence energy-absorbing device is extended. During the deformation process of the roadway wall, the present invention can prevent the length of the anchor rod from being restricted by the roadway space, and can also play the role of anti-shock and energy absorption, and form a constant friction force to absorb impact energy, so as to ensure that the anchor rod is not easy to break.

Description

Continuous yielding anti-scour support bolt for rock burst roadway and its setting method

Technical field

The invention belongs to the field of anti-scour support bolts, and in particular relates to a continuous-abdication anti-scour support bolt for impact rock roadways and a setting method thereof.

technical background

Rock burst is one of the most serious disasters encountered in coal mine production. According to the analysis of 2500 destructive rock bursts recorded in our country, it is shown that 90% of the rock bursts occur in the roadway. Therefore roadway support is an important research topic, and bolt anchorage is an important method of roadway support. The roadway with the risk of rock burst has a large deformation, and the usual anchor rod cannot bear this large impact deformation and is prone to fracture, so it cannot play the role of support. Moreover, the existing bolts have a fixed length. For the bolts with a fixed length, if the length of the reserved bolt is too long, the roadway space will be insufficient. role.

Contents of the invention

In view of the above-mentioned technical problems, the present invention provides a continuous yielding anti-scour support bolt for rock burst roadway, which includes a high-strength threaded anchor body, anchor connecting screws, and a continuous yielding anti-scour suction Energy device, outer cylinder and metal disc;

The main body of the high-strength threaded anchor is fixed in the roadway wall, the surface of the main body of the high-strength threaded anchor is provided with an anchor protrusion, and its tail end is provided with an internal thread;

The two ends of the anchor connecting screw are respectively provided with external threads compatible with the internal thread of the high-strength threaded anchor body; the anchor connecting screw is used to connect the high-strength threaded anchor body and the Continuous abdication anti-shock energy-absorbing device;

The outer cylinder is a cylindrical structure with a circular cross section, which is embedded in the roadway wall;

The metal disc is welded to the tail end of the outer cylinder;

The continuous yielding anti-shock energy-absorbing device is installed in the outer cylinder, including the continuous yielding anti-shock energy-absorbing components, the continuous yielding anti-scourm energy-absorbing connecting parts and the connecting screws of the energy-absorbing components; wherein, several of the The continuous yielding anti-shock energy-absorbing parts are alternately connected with several of the continuous yielding anti-shock energy-absorbing connecting parts through the connecting screws of the energy-absorbing parts; each of the continuous yielding anti-shock energy-absorbing parts has the same structure The structure of each of the continuous abdication anti-shock energy-absorbing connecting parts is exactly the same;

The head end of the continuous yielding anti-shock energy-absorbing device is a continuous yielding anti-shock energy-absorbing component, which is threadedly connected with the tail end of the high-strength threaded anchor rod body through a bolt connecting screw; The tail end of the anti-scorching energy-absorbing device is a continuous yielding anti-scouring energy-absorbing part or a continuous yielding anti-scouring energy-absorbing connecting part, which is exposed in the roadway;

The two ends of the continuous yielding anti-shock energy-absorbing part and the continuous yielding anti-scourm energy-absorbing connecting part are provided with internal threads that are compatible with the bolt connecting screw; the two ends of the energy-absorbing part connecting screw are equipped with Has the same external thread as the bolt attachment screw.

The outer cylinder, the continuous abdication anti-shock energy-absorbing part and the continuous abdication anti-blow energy-absorbing connecting part are made of metal.

The front ends of the continuous abdication anti-shock energy-absorbing component and the continuous abdication anti-shock energy-absorbing connecting part are tapered.

The continuous step-back anti-shock energy-absorbing component is cylindrical, and the continuous step-back anti-scourm energy-absorbing connecting part is a hexagonal prism with a regular hexagonal cross section.

The perimeter of the cross-section of the continuous yielding anti-shock energy-absorbing component and the continuous yielding anti-scourm energy-absorbing connecting component are respectively the same as the perimeter of the cross-sectional inner surface of the outer cylinder.

The circumference of the inner wall of the cross-section of the outer cylinder is 15 cm, and its length is less than the length of the main body of the high-strength threaded anchor rod.

The section perimeter of the continuous abdication anti-shock energy-absorbing part and the continuous abdication anti-shock energy-absorbing connecting part are both 15cm, and the lengths are both 20cm; the length of the bolt connecting screw and the energy-absorbing part connecting screw is All are 10 cm.

The setting method of the above-mentioned continuous abdication anti-scourt support bolt for rock burst roadway includes the following steps:

Step 1, select a drill bit compatible with the outer cylinder to drill a hole on the roadway wall, so that the diameter of the obtained hole can just accommodate the outer cylinder, and its depth is greater than the length of the outer cylinder, and less than the high-strength threaded anchor body and The sum of the lengths of the anti-shock energy-absorbing parts that can be continuously abdicated;

Step 2, setting the outer cylinder welded with the metal disc in the hole;

Step 3, apply resin anchoring agent to the head end of the high-strength threaded anchor body, send the high-strength threaded anchor body into the outer cylinder, and place the head end of the high-strength threaded anchor body on the the bottom of the hole, and then pour concrete into the space between the outer cylinder and the bottom of the hole;

Step 4, connecting the continuous abdication anti-shock energy-absorbing component with the tail end of the high-strength threaded anchor body through the anchor connecting screw;

Step 5, during the deformation process of the roadway wall, when the length of the tail end of the continuous abdication anti-scourm energy-absorbing device exposed outside the aisle wall is greater than the estimated value, this step is not performed; when the continuous abdication When the length of the tail end of the anti-shock energy-absorbing device exposed outside the roadway wall is less than the estimated value, connect more of the continuous anti-shock energy-absorbing connecting parts and the possible The continuous abdication anti-shock energy-absorbing components are alternately connected to the tail end of the continuous abdication anti-shock energy-absorbing device until the length of the tail end of the continuous abdication anti-shock energy-absorbing device exposed outside the roadway wall is greater than the specified length. The estimated value; the numerical value of the estimated value is determined according to the dynamic deformation of the roadway rock burst.

Beneficial effects of the present invention:

The present invention proposes a sustainable backing anti-scourt support bolt for rock burst tunnels. During the deformation process of the roadway wall, the continuous backlash anti-scourt energy-absorbing device can be extended, and then the anchor The length of the rod is not limited by the space of the roadway, and it can always play the role of anti-scour and energy-absorbing to realize the support function; due to the continuous abdication of anti-scour and energy-absorbing parts and the continuous abdication of anti-scour and energy-absorbing connecting parts The shape of the cross-section is different, and the shape of the outer cylinder changes accordingly, so that the outer cylinder and the continuous yielding anti-shock energy-absorbing device form a constant friction force, absorb impact energy, and ensure that the anchor rod is not easy to break.

The invention is reasonable in design, easy to realize and has good practical value.

Description of drawings

Fig. 1 is the structural schematic diagram of the continuous yield anti-scour support bolt used in the rock burst roadway described in the specific embodiment of the present invention;

Fig. 2 is a schematic structural view of the anchor protrusion of the high-strength threaded anchor body described in the specific embodiment of the present invention;

Fig. 3 is a schematic structural view of the continuous abdication anti-shock energy-absorbing device described in the specific embodiment of the present invention;

Fig. 4 is a cross-sectional view of the continuous abdication anti-shock energy-absorbing component and the continuous abdication anti-shock energy-absorbing connection part in the specific embodiment of the present invention;

Fig. 5 is a flow chart of the control method for the continuous yield anti-scour support bolt of the rock burst roadway described in the specific embodiment of the present invention.

In the figure: 1. The main body of the high-strength threaded anchor; 1-1. The protrusion of the anchor; 2. The connecting screw of the anchor; 3. The energy-absorbing device for the continuous displacement and anti-shock; 3-1. The continuous displacement and anti-shock Energy-absorbing parts; 3-2, continuous abdication anti-shock energy-absorbing connecting parts; 3-3, connecting screws for energy-absorbing parts; 4, outer cylinder; 5, metal plate; 6, resin anchoring agent.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention proposes a sustainable backing anti-scourt support bolt for impact rock roadway, as shown in Fig. Energy absorbing device 3, outer cylinder 4 and metal disc 5;

The high-strength threaded anchor body 1 is fixed in the roadway wall, the surface of the high-strength threaded anchor body 1 is provided with an anchor protrusion 1-1, and its tail end is provided with an internal thread;

As shown in Figure 2, the anchor protrusion 1-1 is a cuboid or a pyramid or a mixture of a cuboid and a pyramid; in the same embodiment, the anchor protrusion 1-1 can also use other shapes to create The high friction coefficient between the high-strength threaded anchor rod body 1 and the surrounding environment;

Both ends of the anchor connecting screw 2 are respectively provided with external threads compatible with the internal thread of the high-strength threaded anchor body 1; the anchor connecting screw 2 is used to connect the high-strength threaded anchor body 1 and the continuous abdication anti-shock energy-absorbing device 3;

The outer cylinder 4 is a cylindrical structure with a circular cross section, embedded in the roadway wall;

The metal disk 5 is welded to the tail end of the outer cylinder 4; the metal disk 5 has a limiting effect on the outer cylinder 4, so that the outer cylinder 4 will not be completely trapped inside the roadway wall due to the deformation of the rock mass of the roadway wall ;

As shown in Figure 3, the continuous yielding anti-shock energy-absorbing device 3 is installed in the outer cylinder 4 for absorbing the impact energy transmitted by the roadway wall through the outer cylinder 4, including the continuous yielding anti-scourm energy-absorbing component 3- 1. The continuous abdication anti-shock energy-absorbing part 3-2 and the connecting screw 3-3 of the energy-absorbing part; The breakaway anti-shock energy-absorbing connecting parts 3-2 are alternately connected through energy-absorbing component connecting screws 3-3; The structure of the anti-shock energy-absorbing connecting part 3-2 is exactly the same;

The head end of the continuous yielding anti-shock energy-absorbing device 3 is a continuous yielding anti-shock energy-absorbing component 3-1, which is threaded with the tail end of the high-strength threaded anchor body 1 through the anchor bolt connecting screw 2 ; The tail end of the continuous yielding anti-shock energy-absorbing device 3 is a continuous yielding anti-shock energy-absorbing component 3-1 or a continuous yielding anti-scouring energy-absorbing connecting component 3-2, which is exposed in the roadway;

The two ends of the continuous yielding anti-shock energy-absorbing part 3-1 and the continuous yielding anti-shock energy-absorbing connecting part 3-2 are provided with internal threads that are compatible with the bolt connecting screw; the energy-absorbing part The two ends of the connecting screw 3-3 have the same external thread as the anchor rod connecting screw 2;

The continuous yielding anti-shock energy-absorbing device 3 makes the possible The continuous yielding anti-shock energy-absorbing device 3 can effectively adapt to changes in the tunnel wall structure, so that the continuous yielding anti-scouring energy-absorbing device 3 and the outer cylinder 4 form a constant friction force;

The continuous yielding anti-shock energy-absorbing part 3-1 and the continuous yielding anti-shock energy-absorbing connecting part 3-2 are made of metal, and are used to absorb the impact energy transmitted by the roadway wall through the outer cylinder;

The front ends of the continuous yielding anti-shock energy-absorbing part 3-1 and the continuous yielding anti-scourm energy-absorbing connecting part 3-2 are tapered to make it easier to enter the outer cylinder 4, and further make the The continuous abdication anti-shock energy-absorbing device 3 forms a constant frictional force with the outer cylinder 4;

The continuous yielding anti-shock energy-absorbing part 3-1 is cylindrical, and the continuous yielding anti-shock energy-absorbing connecting part 3-2 is a hexagonal prism with a regular hexagonal cross section, as shown in Figure 4 Shown; through the alternate change of shape, the continuous frictional force of the energy-absorbing device 3 and the outer cylinder 4 is further formed;

The cross-section perimeters of the continuous yielding anti-shock energy-absorbing part 3-1 and the continuous yielding anti-scourm energy-absorbing connecting part 3-2 are respectively the same as the cross-sectional inner surface perimeter of the outer cylinder 4, so as to ensure that the outer cylinder 4 It is closely attached to the continuous yielding anti-shock energy-absorbing device 3 under the pressure of the roadway wall, thereby ensuring a high coefficient of friction between the outer cylinder 4 and the continuous yielding anti-scouring energy-absorbing device 3;

The outer cylinder 4 is made of metal material to ensure that the outer cylinder 4 and the continuous yielding anti-shock energy-absorbing device 3 are closely attached under the pressure of the roadway wall, thereby further ensuring that the outer cylinder 4 and the sustainable yielding anti-scourm High coefficient of friction between energy absorbers 3;

The circumference of the inner wall of the cross section of the outer cylinder 4 is 15cm, and its length is less than the length of the high-strength threaded anchor rod main body 1; The section perimeter of the energy-absorbing connection part 3-2 is all 15cm; The perimeter of the cross-section of the anti-shock energy-absorbing connecting part 3-2 can be adjusted according to actual working conditions;

The lengths of the bolt connecting screw 2 and the connecting screw 3-3 of the energy-absorbing part are both 10 cm; 2 are all 20 cm in length; in the same embodiment, the energy-absorbing component connecting screw 3-3, the continuous yielding anti-shock energy-absorbing component 3-1 and the continuous yielding anti-shock energy-absorbing connecting part 3- The length of 2 can be adjusted according to the actual working conditions;

The setting method of the above-mentioned continuous abdication anti-scourt support bolt for rock burst roadway, as shown in Figure 5, includes the following steps:

Step 1, select a drill bit compatible with the outer cylinder 4 to drill a hole on the roadway wall, so that the diameter of the obtained hole can just accommodate the outer cylinder 4, and its depth is greater than the length of the outer cylinder 4 and smaller than the high-strength threaded anchor The sum of the lengths of the rod main body 1 and the continuous abdication anti-shock energy-absorbing component 3-1;

Step 2, setting the outer cylinder 4 welded with the metal disc 5 in the hole;

Step 3, as shown in Figure 1, apply resin anchoring agent 6 on the head end of the high-strength threaded anchor body 1, send the high-strength threaded anchor body 1 into the outer cylinder 4, and put the high-strength threaded anchor body 1 into the outer cylinder 4. The head end of the strength threaded anchor rod main body 1 is pushed against the bottom of the hole, and then concrete is poured into the gap between the outer cylinder 4 and the bottom of the hole;

Step 4, connecting the continuous abdication anti-shock energy-absorbing component 3-1 with the tail end of the high-strength threaded anchor body 1 through the anchor connecting screw 2;

Step 5, during the deformation process of the roadway wall, when the length of the tail end of the continuous yielding anti-shock energy-absorbing device 3 exposed outside the roadway wall is greater than the estimated value, this step is not performed; When the tail end of the anti-shock energy-absorbing device 3 is exposed outside the roadway wall and the length is less than the estimated value, then as shown in Figure 3, more of the sustainable energy-absorbing parts will be connected by the energy-absorbing component connecting screw 3-3. The position anti-shock energy-absorbing connecting part 3-2 and the said continuous yielding anti-scouring energy-absorbing component 3-1 are alternately connected to the tail end of the said continuous yielding anti-scouring energy-absorbing device 3 until the continuous yielding The length of the tail end of the anti-shock energy-absorbing device 3 exposed outside the roadway wall is greater than the estimated value.

The estimated value in step 5 is determined according to the dynamic deformation of the roadway rock burst.

During the deformation process of the roadway wall, the continuous yielding anti-scourm energy-absorbing device 3 will be subjected to the stress applied with the deformation of the roadway wall, so that the continuous yielding anti-scourm energy-absorbing device 3 will retract into the outer cylinder 4, through the step 5, the continuous abdication anti-shock energy-absorbing device 3 can be extended, so that the length of the anchor rod is not limited by the roadway space, and it can be used all the time. The function of anti-shock and energy absorption realizes the support function;

In the step 5, since the cross-sectional shape of the continuous yielding anti-scour energy-absorbing component 3-1 and the continuous yielding anti-scourm energy-absorbing connecting component 3-2 are different, the shape of the outer cylinder 4 is accordingly Corresponding changes occur, so that the outer cylinder 4 and the continuous abdication anti-shock energy-absorbing device 3 form a constant friction force to absorb impact energy and ensure that the anchor rod is not easy to break.

Claims (8)

1. a kind of continuing resigning erosion control support anchor rod for bump tunnel, which is characterized in that including high intensity threaded anchor Bar main body, anchor pole connecting screw can continue resigning erosion control energy absorption device, outer barrel and metal dish；

The high intensity threaded anchor rod main body is fixed in wall, and the surface of the high intensity threaded anchor rod main body is equipped with anchor pole Protrusion, tail end are equipped with internal thread；

The both ends of the anchor pole connecting screw be respectively equipped be adapted with the internal thread of the high intensity threaded anchor rod main body it is outer Screw thread；The anchor pole connecting screw continues resigning erosion control energy-absorbing dress for connecting the high intensity threaded anchor rod main body with described It sets；

The outer barrel is the tubular structure that cross section is annulus, is embedded in wall；

The metal dish is welded on the tail end of the outer barrel；

The resigning erosion control energy absorption device that continues is in outer barrel, including can continue resigning erosion control energy absorbing component, can continue to step down and prevent Suction can succeeding component and energy absorbing component connecting screw；Wherein, resigning erosion control energy absorbing component and several can be continued described in several The resigning erosion control energy-absorbing succeeding component that continues alternately is connected by energy absorbing component connecting screw；It can continue resigning erosion control described in each The structure of energy absorbing component is identical, and each structure that can continue resigning erosion control energy-absorbing succeeding component is identical；

The head end for continuing resigning erosion control energy absorption device is that can continue resigning erosion control energy absorbing component, with the high intensity threaded anchor rod The tail end of main body is threadedly coupled by anchor pole connecting screw；The tail end for continuing resigning erosion control energy absorption device is that can continue resigning to prevent It rushes energy absorbing component or resigning erosion control energy-absorbing succeeding component can be continued, be placed in tunnel；

The both ends setting for continuing resigning erosion control energy absorbing component and can continuing resigning erosion control energy-absorbing succeeding component connects with the anchor pole Connect the adaptable internal thread of screw；The both ends of the energy absorbing component connecting screw carry outer spiral shell identical with anchor pole connecting screw Line.

2. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute It is metal material to state outer barrel, can continue resigning erosion control energy absorbing component and can continue resigning erosion control energy-absorbing succeeding component.

3. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute Resigning erosion control energy absorbing component can be continued and can continue the front end of resigning erosion control energy-absorbing succeeding component for taper by stating.

4. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute It is cylinder that resigning erosion control energy absorbing component can be continued by, which stating, and described to continue resigning erosion control energy-absorbing succeeding component be cross section is positive six side The hexagon of shape.

5. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute State can continue resigning erosion control energy absorbing component and can continue the perimeter of section of resigning erosion control energy-absorbing succeeding component respectively in the section of outer barrel Surface perimeter is identical.

6. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute The inner wall Zhou Changwei 15cm of outer barrel cross section are stated, length is less than the length of the high intensity threaded anchor rod main body.

7. according to claim 1 continue resigning erosion control support anchor rod for bump tunnel, which is characterized in that institute Resigning erosion control energy absorbing component can be continued and can to continue the perimeter of section of resigning erosion control energy-absorbing succeeding component be all 15cm by stating, and length is all 20 Centimetre；The length of the anchor pole connecting screw and energy absorbing component connecting screw is all 10 centimetres.

8. the setting method described in claim 1 that continue resigning erosion control support anchor rod for bump tunnel is used, It is characterized in that, includes the following steps：

Step 1, the selection drill bit adaptable with outer barrel drills in wall, so as to get the diameter of hole can accommodate just The outer barrel, depth are more than the length of the outer barrel, less than high intensity threaded anchor rod main body and can continue resigning erosion control energy-absorbing portion The sum of length of part；

Step 2, the outer barrel for being welded with metal dish is arranged in described hole；

Step 3, the head end of the high intensity threaded anchor rod main body is smeared into resin anchoring agent, by the high intensity threaded anchor rod master Body is sent into the outer barrel, and the head end of the high intensity threaded anchor rod main body is peaked to the bottom of described hole, then outer barrel with Concrete perfusion in gap between the bottom of described hole；

Step 4, by the anchor pole connecting screw, resigning erosion control energy absorbing component and the high intensity threaded anchor rod can be continued by described in The tail end of main body connects；

Step 5, in wall deformation process, when the tail end for continuing resigning erosion control energy absorption device is exposed to other than wall When length is more than discreet value, then this step is not executed；When it is described continue resigning erosion control energy absorption device tail end be exposed to wall with When outer length is less than the discreet value, then resigning erosion control energy-absorbing more described will can be continued by energy absorbing component connecting screw and connect Continuous component and the resigning erosion control energy absorbing component that continues alternately are connected to the tail end that can continue resigning erosion control energy absorption device, until The tail end for continuing resigning erosion control energy absorption device is exposed to the length other than wall and is more than the discreet value；The discreet value Numerical value according to roadway bump press state deformation and determine.