CN112324333B - Construction method for horizontal directional crossing of complex pebble-gravel stratum by underground pipeline - Google Patents
Construction method for horizontal directional crossing of complex pebble-gravel stratum by underground pipeline Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 238000005553 drilling Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000011435 rock Substances 0.000 claims description 12
- 244000208734 Pisonia aculeata Species 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 9
- 230000005684 electric field Effects 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 238000010291 electrical method Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 210000005056 cell body Anatomy 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000000375 suspending agent Substances 0.000 claims description 3
- 125000003003 spiro group Chemical group 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
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- 238000012954 risk control Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/26—Drilling without earth removal, e.g. with self-propelled burrowing devices
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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Abstract
The invention belongs to the technical field of horizontal directional drilling, and particularly relates to a construction method for an underground pipeline to horizontally and directionally pass through a complex pebble-gravel stratum. According to the invention, the pipeline track is planned firstly, then the drilling machine is used for drilling, then the reamer is used for pulling back and reaming, and finally the pipeline is pulled back and paved, so that the effect of effectively paving the underground pipeline in the complex gravel stratum is achieved, and the drilling operation at the gravel stratum with higher strength requirement is realized through the drill rod coupling with a specific structure. The invention has the advantages that the gravel-gravel stratum can be avoided to the greatest extent in the pipeline paving process, effective drilling can be realized by increasing the drilling strength when encountering the gravel-gravel stratum, and the operations of pulling back and reaming and mud discharging are simple and effective.
Description
Technical Field
The invention belongs to the technical field of horizontal directional drilling, and particularly relates to a construction method for an underground pipeline to horizontally and directionally pass through a complex pebble-gravel stratum.
Background
The horizontal directional crossing is a horizontal directional drilling technology, which refers to an underground pipeline paving technology without excavating the ground, and the operation steps mainly comprise site selection, punching and paving. When the site is selected, gravel stratum which is difficult to drill needs to be explored and avoided, and meanwhile risk control and evaluation need to be done in the drilling process. Firstly, before drilling construction, surveying work of relative density of pebble bed distribution needs to be carried out in a construction area so as to effectively prevent a crossing track from crossing an area with high density and large pebble particle size; secondly, in the drilling process, cracks around the hole wall are monitored and predicted in real time, and hole collapse and slurry bleeding accidents are effectively avoided; finally, establishing a risk emergency scheme in the drilling process, such as problems of drill bit breakage, drill sticking and the like; this therefore requires the introduction of various monitoring, exploration techniques throughout the horizontal directional traversal process. In addition, current drilling rod needs the multisection to connect to reach sufficient length, require just bigger to the joint strength of drilling rod when the gravel and egg stratum punches moreover, this just needs to use the very big shaft coupling of joint strength, and current shaft coupling mostly has intensity not enough, and the complicated problem of dismouting operation.
The patent publication No. CN 101793125A, Chinese patent application publication No. 2010.08.04 discloses a composite reaming construction method for a horizontal directional drilling pipeline passing through rock stratums, and the method comprises the steps of firstly calculating the length of a rock stratum which can be effectively cut by a reamer according to the strength of rock, and determining a reaming middle stop point which needs to be maintained by the reamer; then, installing an underreamer at the front end of a drill rod at the unearthed point, and rotating the drill rod by a drilling machine at one end of the unearthed point to expand back along a guide hole until the underreamer middle stop point; withdrawing the reamer out of the hole towards the unearthing point for maintenance; during maintenance of the reamer, performing large-level nested reaming on the guide hole; after the damaged reamer is repaired, continuing reaming at the level; repeating the steps until the required aperture penetrates the soil-entering point and the soil-discharging point.
However, the construction method in the patent of the invention has the problem that the gravel-gravel stratum cannot be detected in the construction process. The invention patent can not evaluate the relative distribution problem of the pebble stratum, thereby not reducing the occurrence of the high-density pebble stratum and simultaneously failing to monitor the crack expansion and hole collapse accidents in the drilling process in real time.
Disclosure of Invention
The invention aims to provide a construction method for horizontally and directionally penetrating through a complex gravel stratum by an underground pipeline, which can achieve the effect of effectively paving the underground pipeline on the complex gravel stratum by planning a pipeline track, drilling by a drilling machine, then performing back-pull reaming by an underreamer and finally performing back-pull paving on the pipeline, and can realize drilling operation on the gravel stratum with higher strength requirement by a drill rod coupler with a specific structure. The invention has the advantages of accurate exploration of the positions of the gravel stratum, capability of avoiding the gravel stratum to the maximum extent, reduction of unnecessary extra drilling difficulty, flexible and adjustable drilling strength in the drilling process, high overall drilling strength and capability of effectively penetrating the gravel stratum. In addition, the drill rod coupling has the outstanding advantages of high connecting structure strength, difficult loosening and slipping of two sections of drill rods, simple and convenient assembly and disassembly operations of the coupling structure, high drilling strength and strong drilling capability when the coupling has to penetrate gravel stratums.
The technical scheme adopted by the invention for solving the problems is as follows: a construction method for horizontal directional crossing of a complex pebble-gravel stratum by an underground pipeline sequentially comprises the following steps:
s1, planning a pipeline track, exploring the gravel stratum by a high-density electrical method and a drilling exploration method, and adjusting the pipeline track to reduce the probability of encountering the gravel stratum;
s2, drilling by a drilling machine, assembling a drill rod with a proper length, installing a drill bit with a proper type, perforating a pore channel according to a pipeline track, and discharging slurry in the drilling process;
s3, performing reamer pull-back reaming, namely, obtaining a pore canal with a pore diameter enough for pipeline paving by adopting a multi-stage section-by-section pull-back reaming mode;
and S4, pulling back and paving the pipeline, namely pulling back the pipeline to the punched inlet to finish the horizontal directional installation operation of the whole underground pipeline.
The further preferred technical scheme is as follows: in step S1, according to the characteristics of the difference in conductivity between the gravel stratum and the soil layer, the results of the distribution position and the relative density of the gravel stratum are obtained by establishing an electric field underground by using a ground electrode and observing the change of the surface electric field by using an electric measuring instrument.
The further preferred technical scheme is as follows: in step S1, the drilling method uses casing to secure the borehole wall.
The further preferred technical scheme is as follows: in step S2, a drill bit of small-size hard alloy is welded in a welding mode when the gravel stratum is drilled, the length of the drill bit is 5-8m, and the wall thickness is 8-12 mm.
The further preferred technical scheme is as follows: in step S3, high-pressure mud is sprayed on the surface layer of the hole wall to loosen the hole wall in the process of back-drawing and reaming, the hole wall is compacted by a conical drill bit and the cutting soil is carried back to the ground, and suspending agents are added into the mud-pressing agent.
The further preferred technical scheme is as follows: in step S4, the pull-back paving operation is performed using a tractor.
A drill rod coupler for a construction method for enabling an underground pipeline to horizontally and directionally pass through a complex pebble-gravel stratum comprises a slotted ring body unit sleeved with a drill rod end cylinder, square cylinder units with slotted ring body units sleeved at two ends, support plate units which are inserted between the two square cylinder units and used for performing anti-return limiting operation on the slotted ring body units and performing anti-rotation limiting operation on the square cylinder units, and drill rod thread connection holes for allowing the support plate units to pass through are formed in the end plane of the drill rod end cylinder.
The further preferred technical scheme is as follows: the slotted ring body unit comprises a ring body with a square inner ring, a circular ring groove which is arranged on the side surface of the ring body and used for inserting the drill rod end cylinder, and a fastening bolt which is arranged on the outer side groove wall of the circular ring groove and used for clamping the drill rod end cylinder inwards; the square column unit is including inserting two square column in the ring body sets up respectively square column both ends are used for spacing fixedly the circular limiting plate of ring body, and set up circular limiting plate side is passed through the bolt insertion mode of backup pad unit is in order to be used for carrying on the spacing fixed arc notch of hoop.
The further preferred technical scheme is as follows: the backup pad unit inserts two including the card income axial backup pad between the ring body sets up respectively the axial plate of two lateral plane outside positions of axial backup pad department sets up on the axial plate terminal surface and the block is fixed radial plate on drilling rod end drum protrusion end plane sets up on the radial plate and pass behind the drilling rod end drum spacing fixed on the drilling rod end drum backup pad unit with the construction bolt of square cylinder unit, and set up and be in be used for right on the axial inboard side the fastening bolt carries out the locking rectangle cell body of opening spacing operation.
The further preferred technical scheme is as follows: the outer ring surface of the ring body is circular, the fastening bolt is sleeved with the rubber ring, the thickness of the circular limiting plate plus the groove depth of the circular ring groove is equal to the groove depth of the drill rod end cylinder, the thickness of the axial supporting plate is equal to the distance between two adjacent side surfaces of the ring body, the three axial supporting plates form a complete circle, the inner ring surface of the axial plate is attached to the outer ring surface of the ring body, the inner side surface of the radial plate is attached to the end surface plane of the drill rod end cylinder, and the diameter of the drill rod main body is smaller than the inner diameter of the drill rod end cylinder.
Drawings
FIG. 1 is a flow chart showing the operation names of the steps of the construction method of the present invention.
FIG. 2 is a flow chart of a method of exploring a gravel formation of the present invention.
FIG. 3 is a schematic view of the use of the drill pipe coupling of the present invention.
Fig. 4 is a schematic view of the position structure of the slotted ring unit of the present invention.
FIG. 5 is a schematic structural view of a supporting plate unit according to the present invention.
Fig. 6 is a schematic view of a position structure of the square column unit according to the present invention.
Detailed Description
The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.
Example (b): as shown in the attached figures 1, 2, 3, 4, 5 and 6, the construction method for the underground pipeline to horizontally and directionally pass through the complex pebble-gravel stratum is characterized by sequentially comprising the following steps:
s1, planning a pipeline track, exploring the gravel stratum by a high-density electrical method and a drilling exploration method, and adjusting the pipeline track to reduce the probability of encountering the gravel stratum;
s2, drilling by a drilling machine, assembling a drill rod with a proper length, installing a drill bit with a proper type, perforating a pore channel according to a pipeline track, and discharging slurry in the drilling process;
s3, performing reamer pull-back reaming, namely, obtaining a pore canal with a pore diameter enough for pipeline paving by adopting a multi-stage section-by-section pull-back reaming mode;
and S4, pulling back and paving the pipeline, namely pulling back and pulling the pipeline to the punching inlet to finish the horizontal directional installation operation of the whole underground pipeline.
In step S1, according to the characteristics of the difference in conductivity between the gravel stratum and the soil layer, the results of the distribution position and the relative density of the gravel stratum are obtained by establishing an electric field underground by using a ground electrode and observing the change of the surface electric field by using an electric measuring instrument.
In the present embodiment, the high-density electrical method is an existing exploration method, and the electric field construction, and the monitoring and analysis method of the electric field change are performed according to the existing method.
In step S1, the drilling method uses casing to secure the borehole wall.
In this embodiment, the casing used in the drilling and exploration method is made of an existing metal casing, and is used for reinforcing the hole wall and preventing the hole wall from collapsing.
In step S2, a drill bit with a welded small-size hard alloy is adopted when drilling in the gravel stratum, the length of the drill bit is 5-8m, and the wall thickness is 8-12 mm.
In this embodiment, when drilling in the pebble rock formation, the drill bit needs to be strengthened, that is, the existing drill bit embedded with or welded with a small-sized hard alloy head is adopted, so as to ensure that the drilling operation can be effectively performed at the pebble rock formation with hard texture.
In step S3, high-pressure mud is sprayed on the surface layer of the hole wall to loosen the hole wall in the process of pullback and reaming, a conical drill bit compacts the hole wall and carries the cutting soil back to the ground, and suspending agents are added into the mud pressing agent.
In this embodiment, the mud in the process of back-pulling and reaming can be sprayed on the surface layer of the hole wall at the front end of the reaming, so that soil scraps fall off to reduce the resistance of the reaming, and after the reaming bit passes through, the mud is compacted on the hole wall to reduce the probability of subsequent collapse and falling of the hole wall.
In step S4, the pull-back paving operation is performed using a tractor.
In this embodiment, the pipeline traction paving method is performed according to the existing paving requirement, and the tractor is tractor equipment with an existing structure.
Other parts which are not mentioned in the construction method are all carried out according to the existing process standard.
A drill rod coupling for a construction method for enabling an underground pipeline to horizontally and directionally pass through a complex pebble-gravel stratum comprises a slotted ring body unit 1 sleeved with a drill rod end cylinder 11, square cylinder units 2 provided with the slotted ring body unit 1 are sleeved at two ends of the slotted ring body unit 1 respectively, a support plate unit 3 is inserted between the two square cylinder units 2 and used for performing anti-return limiting operation on the slotted ring body unit 1 and performing anti-rotation limiting operation on the square cylinder units 2, and a drill rod screw hole 12 used for enabling the support plate unit 3 to pass through is formed in the plane of the end of the drill rod end cylinder 11.
In this embodiment, the slotted ring unit 1 is a part of the coupling directly connected to the drill rod, the square cylinder unit 2 is used for performing a main function of transmitting rotation torque, and finally the support plate unit 3 has the following advantages:
firstly, the slotted ring body units 1 are supported, and the slotted ring body units and the square column body units 2 support the forward resistance of drilling;
secondly, the square cylinder unit 2 is further limited to rotate, and the effectiveness of torque transmission is guaranteed;
thirdly, the screw fastening action of the slotted ring body unit 1 is reinforced, and after all, if the slotted ring body unit 1 is loosened, all subsequent limiting and connecting actions are invalid.
The slotted ring body unit 1 comprises a ring body 101 with a square inner ring, a circular ring groove 102 which is arranged on the side surface of the ring body 101 and used for inserting the drill rod end cylinder 11, and a fastening bolt 103 which is arranged on the outer side groove wall of the circular ring groove 102 and used for clamping the drill rod end cylinder 11 inwards; the square cylinder unit 2 is including inserting two square cylinder 201 in the ring body 101 sets up respectively square cylinder 201 both ends are used for spacing fixedly the circular limiting plate 202 of ring body 101, and set up circular limiting plate 202 side is in order to be used for carrying on the spacing fixed arc notch 203 of hoop through backup pad unit 3's bolt inserted mode.
In this embodiment, the fastening bolts 103 are arranged in three rows and two rows, the outer annular surface of the drill rod end cylinder 11 is fastened, the insertion end of the fastening bolt 103 is provided with high-strength rubber to ensure the strength of frictional fastening, and the circular position limiting plate 202 is used to ensure the integrity of the ring body 101 and the square column 201.
In this embodiment, the mounting bolt 304 is used for installing and fixing the whole support plate unit 3 on the drill rod end cylinder 11, so that the whole support plate unit 3 is fixed and fixed between two drill rod main bodies 13, the support plate unit 3 itself also has a certain coupling transmission torsion effect, and even if the square inner ring of the ring body 101 is ground flat by the square cylinder 201, the limit effect of the square hole on the square cylinder is lost, the annular limit effect can also be realized through the clamping effect of the mounting bolt 304 at the arc-shaped notch 203, so that the advantage of long service life of the limit structure of the drill rod coupling is finally given, the dismounting difficulty of the whole structure is moderate, and under the use environment of drilling in an egg gravel stratum, the coupling needs to be relatively frequently replaced and overhauled, and the use convenience of the coupling is realized.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the claims appended hereto.
Claims (8)
1. A construction method for horizontal directional crossing of a complex pebble-gravel stratum by an underground pipeline is characterized by sequentially comprising the following steps:
s1, planning a pipeline track, exploring the gravel stratum by a high-density electrical method and a drilling exploration method, and adjusting the pipeline track to reduce the probability of encountering the gravel stratum;
s2, drilling by a drilling machine, assembling a drill rod with a proper length, installing a drill bit with a proper type, perforating a pore channel according to a pipeline track, and discharging slurry in the drilling process;
s3, performing reamer pull-back reaming, namely, obtaining a pore canal with a pore diameter enough for pipeline paving by adopting a multi-stage section-by-section pull-back reaming mode;
s4, pulling back and paving the pipeline, namely pulling back the pipeline to a punching inlet to finish the horizontal directional installation operation of the whole underground pipeline; the drill rod coupling for the construction method for the underground pipeline to horizontally and directionally pass through the complex pebble stratum comprises a slotted ring unit (1) sleeved with a drill rod end cylinder (11), square cylinder units (2) with the slotted ring unit (1) sleeved at two ends respectively, and a support plate unit (3) which is inserted between the two square cylinder units (2) and is used for performing anti-retraction limiting operation on the slotted ring unit (1) and performing anti-rotation limiting operation on the square cylinder units (2), wherein a drill rod screw hole (12) for the support plate unit (3) to pass through is formed in the end plane of the drill rod end cylinder (11); the slotted ring body unit (1) comprises a ring body (101) with a square inner ring, a circular ring groove (102) which is arranged on the side surface of the ring body (101) and used for inserting the drill rod end cylinder (11), and a fastening bolt (103) which is arranged on the outer side groove wall of the circular ring groove (102) and used for clamping the drill rod end cylinder (11) inwards; square cylinder unit (2) are including inserting two square cylinder (201) in ring body (101) set up respectively square cylinder (201) both ends are used for spacing fixed circular limiting plate (202) of ring body (101), and set up circular limiting plate (202) side is in order to be used for carrying on the spacing fixed arc notch (203) of hoop with the bolt insertion mode of backup pad unit (3).
2. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: in step S1, according to the characteristics of the difference in conductivity between the gravel stratum and the soil layer, the results of the distribution position and the relative density of the gravel stratum are obtained by establishing an electric field underground by using a ground electrode and observing the change of the surface electric field by using an electric measuring instrument.
3. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: in step S1, the drilling method uses casing to preserve the borehole wall.
4. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: in step S2, a drill bit with a welded small-size hard alloy is adopted when drilling in the gravel stratum, the length of the drill bit is 5-8m, and the wall thickness is 8-12 mm.
5. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: in step S3, high-pressure mud is sprayed on the surface layer of the hole wall to loosen the hole wall in the process of pullback and reaming, a conical drill bit compacts the hole wall and carries the cutting soil back to the ground, and suspending agents are added into the mud pressing agent.
6. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: in step S4, the pull-back paving operation is performed using a tractor.
7. The construction method of claim 1, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: backup pad unit (3) are including going into to insert two axial backup pad (301) between ring body (101), set up respectively axial plate (302) of two side plane outside positions departments of axial backup pad (301) set up axial plate (302) terminal surface on and the block is fixed radial plate (303) on drilling rod end drum (11) protrusion end plane set up radial plate (303) are gone up and are passed behind drilling rod spiro union hole (12) spacing is fixed on drilling rod end drum (11) backup pad unit (3) with mounting bolt (304) of square cylinder unit (2), and set up and be in on axial plate (302) medial surface and be used for right fastening bolt (103) carry out locking rectangle cell body (305) of opening limiting bit operation.
8. The construction method of claim 7, wherein the underground pipeline is horizontally oriented to traverse the complex pebble rock stratum, and the construction method is characterized in that: the outer ring surface of the ring body (101) is circular, a rubber ring is sleeved on the fastening bolt (103), the thickness of the circular limiting plate (202) plus the groove depth of the circular ring groove (102) is equal to the groove depth of the drill rod end cylinder (11), the thickness of the axial supporting plate (301) is equal to the distance between the two close side surfaces of the ring body (101), the three axial supporting plates (301) form a complete circle, the inner ring surface of the axial plate (302) is attached to the outer ring surface of the ring body (101), the inner side surface of the radial plate (303) is attached to the end plane of the drill rod end cylinder (11), and the diameter of the drill rod main body (13) is smaller than the inner diameter of the drill rod end cylinder (11).
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| CN201152148Y (en) * | 2008-01-24 | 2008-11-19 | 煤炭科学研究总院西安研究院 | Soil horizon hole external lifting and pressing type reamer bit |
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| CN112324333A (en) | 2021-02-05 |
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