CN113669090B - Anchor rod construction process - Google Patents
Anchor rod construction process Download PDFInfo
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- CN113669090B CN113669090B CN202110966605.6A CN202110966605A CN113669090B CN 113669090 B CN113669090 B CN 113669090B CN 202110966605 A CN202110966605 A CN 202110966605A CN 113669090 B CN113669090 B CN 113669090B
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- drill bit
- hole
- water outlet
- sleeve
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 238000005553 drilling Methods 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 239000012535 impurity Substances 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000012634 fragment Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims 6
- 239000002002 slurry Substances 0.000 description 17
- 239000004576 sand Substances 0.000 description 10
- 239000002689 soil Substances 0.000 description 9
- 239000004575 stone Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000004308 accommodation Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides an anchor rod construction process, which comprises the following steps: positioning, first layer construction, second layer construction, placing anchor rods, reaming grouting, finishing construction and the like.
Description
Technical Field
The invention relates to the technical field of anchor rod construction, in particular to an anchor rod construction process.
Background
At present, the rock-soil anchoring technology is widely applied to engineering construction of slopes, tunnels, underground projects, mines and the like, is an effective method for improving stability of the rock-soil projects and solving the problem of stability of complex rock-soil projects, and needs to use double-sleeve bolters in the anchor rod construction drilling process, and can meet three problems when the double-sleeve bolter is used under the condition that a coastal pebble gravel layer is rich in water in the anchor rod construction process, (1) a drill bit caused by pebble cannot drill, (2) sand gushing is caused by large water head pressure under the condition of rich water, and (3) a hole is caused by large water head pressure under the condition of rich water.
Disclosure of Invention
The embodiment of the invention provides an anchor rod construction process, which comprises the steps of constructing by using double sleeves, constructing a first layer of pebble gravel layer by adopting an improved first drill bit, effectively crushing pebble gravel by the improved first drill bit, flushing crushed pebble gravel from an outer sleeve by water sprayed from a first water outlet hole, a second water outlet hole and a third water outlet hole, avoiding the phenomenon of drilling sticking, removing the inner sleeve after the outer layer is constructed on the first layer, retaining the outer sleeve, avoiding hole collapse and sand burst, constructing a second layer of rich water layer by adopting the improved second drill bit, guiding the second drill bit to advance in the construction process, simultaneously spraying slurry from different directions by a slurry outlet hole, keeping the pressure balance inside a drilled hole, avoiding the hole collapse, flushing sundries inside the drilled hole from the inner sleeve, and solving the problems that the drill bit cannot drill due to the pebble gravel in the current anchor rod construction and the problem of sand burst and the hole caused by high water head pressure under the water condition.
In view of the above problems, the technical scheme provided by the invention is as follows:
the anchor rod construction process comprises the following steps:
s1, positioning, namely measuring the position of a drilling hole according to a construction drawing and marking;
s2, constructing a first layer, transporting the double-sleeve jumbolter to a drilling position, installing a first drill bit on a drill rod of the double-sleeve jumbolter, wherein the first drill bit comprises a first connecting body, a first connecting seat and a first insert, the first connecting body is connected with the end face of the drill rod of the jumbolter, a first water outlet hole, a second water outlet hole and a third water outlet hole are sequentially formed in the end face of the first connecting body, which is close to the drill rod, the first water outlet hole, the second water outlet hole and the third water outlet hole are communicated with a cavity in the drill rod, the first connecting seat is installed on the surface of the other end of the first connecting body, the number of the first connecting seats is three, the axes of the first connecting bodies are used as array centers, the first connecting seats are distributed on the surface of the other end of the first connecting body, a first containing cavity is formed between two adjacent first connecting seats, the first water outlet hole, the second water outlet hole and the third water outlet hole are sequentially communicated with the first containing cavity, the first drill bit is driven by the first drill bit to be aligned with the drill rod, the first drill bit is rotated to the drill rod, the first drill bit is driven by the first drill bit to be aligned with the drill rod through the first connecting seat, the first drill bit is rotated to the first drill bit, the first drill bit is driven to be aligned with the drill bit through the first drill bit, the first drill bit is rotated to the first connecting seat, the drill bit is aligned with the drill bit through the first connecting hole, the first connecting seat, the drill bit is aligned with the drill holes, finishing the construction of the first layer hole site;
s3, constructing a second layer, namely taking down a first drill bit, installing the second drill bit on a drill rod of a double-sleeve jumbolter, wherein the second drill bit comprises a second connecting body, a second connecting seat, second inserts and a guide column, one end of the second connecting body, which is close to the drill rod, is provided with a grout outlet, the grout outlet is communicated with a cavity in the drill rod, the second connecting seat is installed on the end face of the other end of the second connecting body, the number of the second connecting seats is three, the axes of the second connecting body is used as an array center, the second connecting seats are distributed on the surface of the other end of the second connecting body, a second containing cavity is formed between two adjacent second connecting seats, the grout outlet is communicated with the first containing cavity, the second inserts are installed on one side of the second connecting seat, the guide column is installed on the top of the second connecting seat, the top of the guide column is provided with a cutting edge, the angle of the double-sleeve jumbolter is adjusted, the second connecting seat is aligned with the end face of the other end face of the second connecting body, the drill rod is driven by the drill rod, the drill bit is driven by a rotary pump to enter the drill rod, debris is driven by the drill bit, and the drill bit is driven to enter the bore hole, and the bore hole is driven by the drill rod, and the drill bit is driven to enter the bore hole through the bore hole, and the bore hole is completely;
s4, placing an anchor rod steel stranded wire and a flange plate into the hole, and pulling out the outer sleeve beyond the length of the enlarged head of the anchor rod;
s5, reaming and grouting, namely moving the outer sleeve to the position of the outer sleeve by using a high-pressure rotary jet drilling machine, aligning the high-pressure rotary jet head, penetrating the rotary jet head into the outer sleeve to the designed length, starting rotary jet of the high-pressure expansion head, and completing grouting;
and S6, completing construction, removing the high-pressure rotary jet drilling machine, moving the double-sleeve bolting machine to the bolting position, pulling out the outer sleeve by using the double-sleeve bolting machine, and closing the bolting hole opening to complete construction.
As a preferred embodiment of the present invention, the marking in step S1 includes drilling height, angle, aperture, and drilling depth information.
As a preferable technical scheme of the invention, the first inserts are made of diamond composite sheets, the number of the first inserts is twenty-four, eight first inserts are used as a group, and the first inserts are respectively distributed on the surface of the first connecting seat.
As a preferable technical scheme of the invention, the second inserts and the guide posts are made of cobalt carbide, the number of the second inserts is nine, and the second inserts are three in a group and are respectively distributed on one side of the second connecting seat.
As a preferable technical scheme of the invention, the axis of the guide post and the axis of the second connector are positioned on the same straight line.
In the S4, after the anchor rod steel strand is processed, the anchor rod steel strand and the flange plate are synchronously fed into the drill hole until one meter of the outer end of the hole is left, when the anchor rod steel strand is difficult to be inserted into the outer sleeve, the outer sleeve is pulled out, impurities in the drill hole are removed, the outer sleeve is inserted into the drill hole again, and meanwhile, the impurities in the drill hole are flushed out by using clean water.
In S4, the steel strand of the anchor rod and the flange plate need to be deoiled and derusted before use, so as to avoid affecting the adhesion with the anchor body.
Compared with the prior art, the invention has the beneficial effects that: according to the anchor rod construction process, double-sleeve construction is adopted, the first modified drill bit is adopted to carry out construction of a first layer of pebble and gravel layer, the first modified drill bit can effectively crush pebble and gravel, meanwhile, the pebble and gravel after crushing are flushed out of the outer sleeve by water sprayed out of the first water outlet, the second water outlet and the third water outlet, the phenomenon of blocking drilling is avoided, during the second layer construction, the inner sleeve is removed after the outer layer is constructed on the first layer, the outer sleeve is reserved, hole collapse and sand gushing are avoided, the second modified drill bit is adopted to carry out construction of a second layer of rich water layer, the guide post guides the second drill bit to advance in the construction process, meanwhile, slurry outlet holes spray slurry from different directions, pressure balance inside drilling holes is kept, hole collapse is avoided, sundries inside the drilling holes are flushed out from the inner portion of the outer sleeve, and the problems that the drill bit cannot drill due to pebble and gravel in the current anchor rod construction cannot be drilled, and water head pressure is high under the condition that sand gushing is caused.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
FIG. 1 is a schematic flow chart of an anchor rod construction process disclosed in an embodiment of the invention;
FIG. 2 is a schematic view of a first drill bit according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a second drill bit according to an embodiment of the present invention.
Reference numerals: 1. a first drill bit; 11. a first connecting body; 111. a first water outlet hole; 112. a second water outlet hole; 113. a third water outlet hole; 12. a first connection base; 121. a first accommodation chamber; 13. a first insert; 2. a second drill bit; 21. a second connector; 211. a pulp outlet hole; 22. a second connecting seat; 221. a second accommodation chamber; 23. a second insert; 24. a guide post; 241. cutting edge.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1-3, an anchor construction process comprises the following steps:
s1, positioning, namely measuring the position of a drilling hole according to a construction drawing and marking, wherein the marking comprises the height, angle, aperture and depth information of the drilling hole;
s2, a first layer of construction is carried out, a double-sleeve jumbolter is transported to a drilling position, a first drill bit 1 is installed on a drill rod of the double-sleeve jumbolter, the first drill bit 1 is communicated with an inner cavity of the drill rod of the jumbolter, the angle of the drill rod of the double-sleeve jumbolter is adjusted, the first drill bit 1 is aligned with a positioning mark of a hole in the step S1, a jumbolter and a water pump are started, the drill rod of the jumbolter drives the first drill bit 1 to rotate, in the process of rotating the first drill bit 1, clear water is sprayed by the first drill bit 1, sundries generated by the hole are punched out of the hole through an inner sleeve of the double-sleeve jumbolter, and after the drill bit 1 is drilled to a preset depth, the first drill bit 1 is taken out, and construction of a first layer of hole site is completed;
specifically, in prior art, double-sleeve roof bolter includes interior sleeve pipe, outer tube, drilling rod, slush pump and water pump, interior sleeve pipe is located the inside of outer tube, the drilling rod is located the inside of interior sleeve pipe, double-sleeve roof bolter synchronous drive inside and outside sleeve pipe and drilling rod motion, at first drill bit 1 moving in-process, interior sleeve pipe is used for protecting drilling rod and first drill bit 1, be used for discharging the pebble gravel piece and the debris that produce in the drilling process simultaneously, the outer tube is used for keeping the structure of drilling and avoids drilling to gush out sand and collapse, after first drill bit 1 drills into preset degree of depth according to the design, take out first drill bit 1, accomplish the construction of first layer hole site.
S3, a second layer of construction is carried out, the first drill bit 1 is taken down, a second drill bit 2 is installed on a drill rod of a double-sleeve jumbolter, the second drill bit 2 is communicated with an inner cavity of the drill rod of the jumbolter, the angle of the drill rod of the double-sleeve jumbolter is adjusted, the second drill bit 2 is aligned with a drill hole in the step S2, a jumbolter and a slurry pump are started, the drill rod of the jumbolter drives the second drill bit 2 to rotate, in the process of rotating the second drill bit 2, sundries generated by drilling are ejected by the second drill bit 2 to be punched out of a hole through an inner sleeve, after the drill is drilled to a preset depth, the second drill bit 2 and the inner sleeve are taken out, the outer sleeve is left in the drill hole, and construction of the second layer of drilling is completed;
specifically, in the process of the operation of the second drill bit 2, the inner sleeve is used for protecting the drill rod and the second drill bit 2, and is simultaneously used for discharging pebble, gravel, fragments and sundries generated in the drilling process, the outer sleeve is used for keeping the drilling structure to avoid sand burst and collapse of the drilling hole, after the second drill bit 2 is drilled into a preset depth according to the design, the second drill bit 2 and the inner sleeve are taken out, the outer sleeve is left in the drilling hole, and the construction of the second layer of drilling hole is completed.
S4, placing an anchor rod steel stranded wire and a flange plate into the hole, and pulling out the outer sleeve beyond the length of the enlarged head of the anchor rod;
specifically, after the processing of stock steel strand wires is accomplished, stock steel strand wires and ring flange need carry out deoiling rust cleaning before using to avoid influencing the bonding with the anchor, send into stock steel strand wires and ring flange in step in the drilling until the drill way outer end remains one meter, when finding stock steel strand wires and insert in the outer tube difficulty, pull out the outer tube, clear away the impurity in the drilling, and insert the drilling inside with the outer tube again, use simultaneously to pour into the clear water and wash out the impurity inside the drilling.
S5, reaming and grouting, namely moving the outer sleeve to the position of the outer sleeve by using a high-pressure rotary jet drilling machine, aligning the high-pressure rotary jet head, penetrating the rotary jet head into the outer sleeve to the designed length, starting rotary jet of the high-pressure expansion head, and completing grouting;
and S6, completing construction, removing the high-pressure rotary jet drilling machine, moving the double-sleeve bolting machine to the bolting position, pulling out the outer sleeve by using the double-sleeve bolting machine, and closing the bolting hole opening to complete construction.
As shown in fig. 2, the first drill bit 1 comprises a first connector 11, a first connecting seat 12 and first inserts 13, the first connector 11 is connected with the end face of a drill rod of the anchoring machine, a first water outlet 111, a second water outlet 112 and a third water outlet 113 are sequentially formed on the end face of the first connector 11, which is close to the drill rod, the first water outlet 111, the second water outlet 112 and the third water outlet 113 are communicated with a cavity in the drill rod, the first connecting seat 12 is mounted on the surface of the other end of the first connector 11, the number of the first connecting seats 12 is three, the axle center of the first connector 11 is used as the array center, the first inserts 13 are distributed on the surface of the other end of the first connector 11, the material of the first inserts 13 is diamond composite sheets, the number of the first inserts 13 is twenty-four, the eight first inserts 13 are used as a group, the eight first inserts 13 are respectively distributed on the surface of the first connecting seat 12, the first accommodating cavity 121 is formed between two adjacent first connecting seats 12, the first water outlet 111, the second water outlet 112 and the third water outlet 113 are communicated with the first accommodating cavity 121, the first insert 13 is arranged on the surface of the first connecting seat 12, in the construction process of the first layer, the first insert 13 of the diamond composite sheet material arranged on the first drill bit 1 is contacted with pebble in the rotation process to crush the pebble, the crushed pebble enters the first accommodating cavity 121, the inner cavity of a drill rod of the anchoring machine is connected with a water pump, water enters the accommodating cavity from the first water outlet 111, the second water outlet 112 and the third water outlet 113, pebble powder and other sundries in the accommodating cavity are flushed into the inner sleeve and discharged to the outside through the outer sleeve, and the phenomenon that the drill bit cannot be used for completing the construction of the first layer due to the clamping of the pebble is avoided.
As shown in fig. 3, the second drill bit 2 includes a second connector 21, a second connecting seat 22, second inserts 23 and a guide post 24, one end of the second connector 21 near the drill rod is provided with a slurry outlet 211, the slurry outlet 211 is communicated with a cavity in the drill rod, the second connector 22 is mounted on the end face of the other end of the second connector 21, the number of the second connectors 22 is three, the axes of the second connectors 21 are used as the array center and distributed on the surface of the other end of the second connector 21, a second accommodating cavity 221 is formed between two adjacent second connectors 22, the slurry outlet 211 is communicated with the first accommodating cavity 121, the second inserts 23 are mounted on one side of the second connector 22, the second inserts 23 and the guide post 24 are made of cobalt carbide, the axes of the guide post 24 and the axes of the second connectors 21 are positioned on the same straight line, the number of the second inserts 23 is nine, the number of the second inserts 23 is used as a group, the guide posts 24 are respectively distributed on one side of the second connecting seat 22, the guide posts 24 are arranged on the top of the second connecting seat 22, cutting edges 241 are arranged on the top of the guide posts 24, in the construction process of the second layer, the cutting edges 241 arranged on the top of the guide posts 24 form a small hole in front to guide the advancing direction of the second drill bit 2, the second insert 23 made of cobalt carbide material arranged on the second drill bit 2 is crushed with soil and broken stone in front in the rotating process, crushed soil and broken stone and other sundries enter the second accommodating cavity 221, the inner cavity of a drill rod of the anchor rod machine is connected with a slurry pump, slurry enters the accommodating cavity from a slurry outlet 211, the crushed soil and broken stone in the accommodating cavity are flushed into the inner sleeve and discharged to the outside through the outer sleeve, meanwhile, the sprayed slurry generates water purifying pressure in the drill hole to form a liquid support, the problems of hole collapse and sand gushing in the anchor rod construction process are avoided.
In the construction process of the anchor rod, when a first layer of construction is carried out, a first drill bit 1 and a second drill bit 2 are adopted, the first drill bit 1 is installed on a drill rod of a double-sleeve anchor rod drilling machine, a first insert 13 of diamond composite sheet material arranged on the first drill bit 1 contacts with pebble in the rotation process to crush the pebble, the crushed pebble enters a first accommodating cavity 121, the inner cavity of the drill rod of the anchor rod drilling machine is connected with a water pump, water enters the accommodating cavity from a first water outlet 111, a second water outlet 112 and a third water outlet 113, pebble powder and other sundries in the accommodating cavity are flushed into an inner sleeve and are discharged to the outside through an outer sleeve, the problem that the pebble is blocked by the drill bit is avoided, after the pebble is drilled to a preset depth, the first drill bit 1 is taken out, the construction of a first layer of hole site is completed, the first drill bit 1 is taken down, the second drill bit 2 is arranged on the drill rod of the double-sleeve jumbolter, the jumbolter and the slurry pump are started, the drill rod of the jumbolter drives the second drill bit 2 to rotate, the second insert 23 made of cobalt carbide material arranged on the second drill bit 2 is crushed with soil and broken stone in front in the rotating process, the crushed soil and broken stone and other sundries enter the second accommodating cavity 221, the inner cavity of the drill rod of the jumbolter is connected with the slurry pump, slurry enters the accommodating cavity from the slurry outlet 211, the crushed soil and broken stone in the accommodating cavity and other sundries are flushed into the inner sleeve and discharged to the outside through the outer sleeve, meanwhile, the sprayed slurry generates water purifying pressure in the drill hole to form a liquid support, so as to avoid hole collapse and sand gushing of the drill hole, the second drill bit 2 and the inner sleeve are taken out after the second drill bit 2 is drilled to a preset depth according to design, the construction of the second layer of drill hole is completed, after the processing of the anchor rod steel strand wires is completed, the anchor rod steel strand wires and the flange plate need to be subjected to oil removal and rust removal treatment before being used, the anchor rod steel strand wires and the flange plate are synchronously fed into a drill hole until one meter of outer ends of the holes are left, when the difficulty in inserting the anchor rod steel strand wires into the outer sleeve is found, the outer sleeve is pulled out, impurities in the drill hole are removed, the outer sleeve is inserted into the drill hole again, meanwhile, impurities in the drill hole are flushed out by injecting clear water, a high-pressure rotary jet drilling machine is used for moving to the outer sleeve position, a high-pressure rotary jet head is used for hole alignment, the rotary jet head is penetrated into the outer sleeve to reach the designed length, high-pressure rotary jet is started, grouting is completed, the high-pressure rotary jet drilling machine is moved to the anchor rod position, the outer sleeve is pulled out by using the double-sleeve bolting machine, and the holes of the anchor rod are closed, and the problems that a drill bit cannot drill due to pebble in the current anchor rod construction, and sand gushing and hole collapse are caused by high water head pressure under the water-rich condition are solved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. The anchor rod construction process is characterized by comprising the following steps of:
s1, positioning, namely measuring the position of a drilling hole according to a construction drawing and marking;
s2, a first layer of construction is carried out, a double-sleeve jumbolter is transported to a drilling position, a first drill bit (1) is installed on a drill rod of the double-sleeve jumbolter, the first drill bit (1) comprises a first connecting body (11), a first connecting seat (12) and a first insert (13), the first connecting body (11) is connected with the end face of the drill rod of the jumbolter, a first water outlet hole (111), a second water outlet hole (112) and a third water outlet hole (113) are sequentially formed in the end face of the first connecting body (11) close to one end of the drill rod, the first water outlet hole (111), the second water outlet hole (112) and the third water outlet hole (113) are communicated with a cavity inside the drill rod, the first connecting seat (12) is installed on the surface of the other end of the first connecting body (11), the number of the first connecting seats (12) is three, the first connecting seat (11) is used as an array center, the first water outlet holes (111), the second water outlet holes (112) and the third water outlet holes (113) are distributed on the surface of the other end of the first connecting body (11) and are communicated with the first water outlet hole (121) of the first connecting seat (121), aligning the first drill bit (1) with the positioning mark of the drilling hole in the step S1, connecting a water pump with the inner cavity of a drill rod of the roof bolter, starting the roof bolter and the water pump, driving the first drill bit (1) to rotate by the drill rod of the roof bolter, enabling generated fragments and sundries to enter a first accommodating cavity (121) in the process of rotating the first drill bit (1), spraying clear water from a first water outlet hole (111), a second water outlet hole (112) and a third water outlet hole (113) on the first drill bit (1), flushing sundries generated by drilling out of the holes through an inner sleeve of the double-sleeve roof bolter, and taking out the first drill bit (1) after drilling to a preset depth, so as to finish the construction of a first layer of hole site;
s3, constructing a second layer, taking down a first drill bit (1), installing a second drill bit (2) on a drill rod of a double-sleeve jumbolter, wherein the second drill bit (2) comprises a second connecting body (21), a second connecting seat (22), a second insert (23) and a guide column (24), one end, close to the drill rod, of the second connecting body (21) is provided with a grout outlet hole (211), the grout outlet hole (211) is communicated with a cavity in the drill rod, the second connecting seat (22) is installed on the end face of the other end of the second connecting body (21), the number of the second connecting seats (22) is three, the axes of the second connecting bodies (21) are used as array centers, the surfaces of the other ends of the second connecting bodies (21) are distributed, a second accommodating cavity (221) is formed between two adjacent second connecting seats (22), the grout outlet hole (211) is communicated with the first accommodating cavity (121), the second insert (22) is installed on one side of the second connecting seat (23) of the drill rod (22), the guide column (24) is provided with a cutting blade (2), the drill rod (2) is installed on one side of the drill rod, the guide column (24) is provided with a mud pump (S), the drill bit is connected with the guide column (2), the drill bit is arranged on one side of the top of the drill rod (2, and the drill bit is adjusted, the drill rod of the roof bolter drives the second drill bit (2) to rotate, in the process of rotating the second drill bit (2) to drill holes, generated fragments and sundries enter a second accommodating cavity (221), the fragments and the sundries are punched out of the holes through the inner sleeve, after the drill rod is drilled to a preset depth, the second drill bit (2) and the inner sleeve are taken out, the outer sleeve is left in the drill holes, and the construction of the second layer of drill holes is completed;
s4, placing an anchor rod steel stranded wire and a flange plate into the hole, and pulling out the outer sleeve beyond the length of the enlarged head of the anchor rod;
s5, reaming and grouting, namely moving the outer sleeve to the position of the outer sleeve by using a high-pressure rotary jet drilling machine, aligning the high-pressure rotary jet head, penetrating the rotary jet head into the outer sleeve to the designed length, starting rotary jet of the high-pressure expansion head, and completing grouting;
and S6, completing construction, removing the high-pressure rotary jet drilling machine, moving the double-sleeve bolting machine to the bolting position, pulling out the outer sleeve by using the double-sleeve bolting machine, and closing the bolting hole opening to complete construction.
2. A rock bolt construction process according to claim 1, wherein: the marks in the step S1 comprise the height, angle, aperture and depth information of the drilled hole.
3. A rock bolt construction process according to claim 1, wherein: the first inserts (13) are made of diamond composite sheets, the number of the first inserts (13) is twenty-four, eight first inserts (13) are used as a group, and the eight first inserts are distributed on the surface of the first connecting seat (12) respectively.
4. A rock bolt construction process according to claim 1, wherein: the second inserts (23) and the guide posts (24) are made of cobalt carbide, the number of the second inserts (23) is nine, and three second inserts (23) are used as a group and are respectively distributed on one side of the second connecting seat (22).
5. A rock bolt construction process according to claim 1, wherein: the axis of the guide post (24) and the axis of the second connector (21) are positioned on the same straight line.
6. A rock bolt construction process according to claim 1, wherein: in the step S4, after the processing of the anchor rod steel stranded wire is completed, the anchor rod steel stranded wire and the flange plate are synchronously fed into the drill hole until one meter of the outer end of the orifice is left, when the difficulty in inserting the anchor rod steel stranded wire into the outer sleeve is found, the outer sleeve is pulled out, impurities in the drill hole are removed, the outer sleeve is inserted into the drill hole again, and meanwhile, the impurities in the drill hole are flushed out by injecting clear water.
7. A rock bolt construction process according to claim 1, wherein: in the step S4, oil and rust removal treatment is required to be carried out on the anchor rod steel stranded wire and the flange plate before the anchor rod steel stranded wire and the flange plate are used for avoiding affecting the adhesion with an anchoring body.
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| CN114382434B (en) * | 2021-12-22 | 2023-07-14 | 中国石油大学(华东) | Surface conduit self-drilling well cementation device and method for deep water |
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