A kind of down-the-hole impact cone
The utility model belongs to geological drilling engineering field, is specifically related to a kind of down-the-hole impact cone.
At present, the drilling equipment that geological drilling field is conventional mainly contains three kinds:
(1) eccentric down-hole hammer is with guard system
Principle: according to eccentric stiffener principle, relies on a starter to drive an eccentric reaming device, and under the percussion of down-hole hammer, guiding drives eccentric reaming device to carry out reaming, makes aperture slightly larger than sleeve outer, and sleeve pipe synchronously to follow up protection hole wall with drill bit.
Advantage: creep into outside the extended sleeve pipe of drill bit, sleeve pipe can synchronously follow up, and can creep into comparatively hard formation, meets large field stone and can directly creep into and the sleeve pipe that synchronously follows up.
Existing problems: one is that drill bit need stretch out outside sleeve pipe and creeps into, and as proposed outside hole by drilling tool, must reversely rotate drilling tool, could be proposed by telescoping mechanism by outer drill bit retraction sleeve pipe.Because interior working environment of holing is complicated, fine sand grain often blocks telescoping mechanism, causes it malfunctioning, causes outer drill bit can not retract in sleeve pipe.Like this, only have and sleeve pipe is all transferred to, cause complete opening to be scrapped, lose huge.Two is need complete opening deslagging in drilling process, and when holing darker, deslagging difficulty, drilling efficiency reduction maybe can not be crept into.
(2) down-hole hammer follows guard system with one heart
Principle: drill bit impact broken rock in down-hole hammer, interior drill bit drives outer drill bit broken rock by clashing into outer drill bit shoulder, and outer drill bit is connected with sleeve pipe with adapter sleeve by pin, and sleeve pipe synchronously follows up with outer drill bit.The gyration of inner and outer pipes drives two-tube simultaneously revolution by relocation mechanism and realizes.
Advantage: the some drawbacks overcoming eccentric drilling tool eccentric stiffener, the follow-up degree of depth increases to some extent.Comparatively hard formation can be crept into, meet large field stone and can directly creep into and the sleeve pipe that synchronously follows up.
Existing problems: one is that use cost is high.The processing cost of consumptive material increases, and often cover increases cost more than 500 yuan.Concentric locking collar must to be stayed in hole and to scrap, and every hole increases cost more than 300 yuan.As pressed 30 meters, every hole depth calculation, every meter increases cost more than 30 yuan, does not have the market competitiveness.Two is that connected mode between its sleeve pipe and pin is unreasonable, and insufficient strength, concentrates position easily to occur drawing crack at casing stress, cause drilling accident.Three is need complete opening deslagging in drilling process, when hole darker time, deslagging difficulty or from deslagging sleeve pipe, cause drilling efficiency reduction maybe can not creep into.
(3) percussion drilling tool for porous gravel layer
State Intellectual Property Office has announced " percussion drilling tool for porous gravel layer " patent of being applied for by No.10 Engineering Department, Zhongnan Basic Enqineering Corp., Changsha on May 19th, 1993, the patent No. is 92217614.0.
Principle: be made up of weight, sleeve pipe, shoe, taper bit.Taper bit and shoe, shoe are with sleeve pipe all with being threaded, and drilling rod is threaded with cover is effective through the large through-hole at weight center.Put down after ground hoist engine promotes weight to certain altitude, utilize the deadweight of weight to allow it fall and impact sleeve pipe top, impact force is passed to shoe by sleeve pipe, and shoe drives taper bit to creep into rock stratum.
Advantage: structure is simple, and easy and simple to handle, without consumable accessory, use cost is low, does not need deslagging.
Existing problems: one is meet relatively large stone then can not creep into.Two is at ground tension weight churning, without guiding in hole, easily causes hole scattering.Three be taper bit with shoe with being threaded, once split out conehead, then can not reconnect again, can not pipe-following drilling again, limitation is very large.Four is that taper bit dismounting will be delivered drill rod special and completes in hole, and when holing darker, deflection is large, and drill rod special effectively can not be connected with the screw thread of taper bit, may cause and dismantles unsuccessfully and cause complete opening to be scrapped.When holing more shallow, the frictional force of sleeve pipe and hole wall is inadequate, sleeve pipe is rotated together with taper bit, then can not pull down taper bit.As long as taper bit can not split out smoothly, then sleeve pipe and the passage at the bottom of hole can not be opened, and cause this hole to scrap.Five be weight in ground shock, in hole, the elasticity of drilling tool and sleeve pipe can apparatus with shock absorbing, and when deepening gradually when holing, the impact energy arriving sleeve bottom becomes more and more less, by the impact of wall friction power, slowly maybe cannot continue with pipe gradually with pipe speed.Six is can not get core sampling with pipe well section.
Utility model content
The purpose of this utility model solves the technical barrier that sand and gravel stratum, quicksand formation, limestone cave stratum are passed through in boring, improves drilling efficiency, reduce construction cost, effectively avoid boring to scrap, and guarantees to get core sampling smoothly with pipe well section.
For this reason, the technical scheme that the utility model adopts is: a kind of down-the-hole impact cone, comprise drilling rod, the impactor of built-in block stamp, sleeve pipe, the lower end of described drilling rod and the upper end of impactor are threaded connection, described sleeve pipe is arranged on outside impactor, impact cone and impingement shoe is also provided with in sleeve pipe, the top of described impact cone is stretched in impactor and is connected by spline with impactor, and by being arranged on the latch locking in vertical bar hole, impact cone energy relative impact device is moved up and down within the specific limits; The top of described impact cone is provided with the air vent of " L " shape, and the middle part of impact cone is with step, and described step has up/down perforation and circumferentially uniform hole of cooling down, the bottom of impact cone is with conical head; Described impingement shoe is positioned at the below of impact cone and is connected with casing threads, the lower end of impingement shoe is tapered and reach outside sleeve pipe, in impingement shoe, have the passage passed through for impact cone bottom, and the conicity angles alpha of conical head is equal with the taper angle of impingement shoe lower end, and α is 90 ~ 120 °; When described step is pressed in the top of impingement shoe, the conical surface of conical head is just in time coplanar with the impingement shoe lower end conical surface.
Operating principle and process as follows: during boring, by under whole down-the-hole impact cone at the bottom of hand-hole, start ground air compressor and blow in drilling rod, now fit tightly bottom impact cone top and block stamp, enclose air-supply passage, impactor starts at once because interior chamber pressure increases, and the built-in block stamp of impactor is with high-frequency striking impact cone top part.Impact cone is direct centrifugation stratum downwards, and by step, impact force is passed to impingement shoe simultaneously, and force impingement shoe to be crept into downwards, power is passed to sleeve pipe by screw thread by impingement shoe, drives sleeve pipe to follow up downwards.
Drilling rod, the impactor being with block stamp, impact cone and impingement shoe form the drilling tool of down-the-hole impact cone.As needed to pull out of hole, only need carry drilling rod on ground, drilling tool in hole all can be proposed, open the passage on sleeve pipe and stratum immediately, carry out fixed point and get core sampling, pumping test etc.As continued to creep into, again will enter under drilling tool in sleeve pipe, repeat above-mentioned steps.
As relatively large stone, can propose drilling tool in hole, the passage between sleeve pipe and stratum is opened immediately, under enter little one-level tup (internal diameter of impingement shoe need be less than) impact, after being smashed, then under enter impact cone, continue pipe-following drilling.
The beneficial effects of the utility model:
(1) structure is simple, is easy to operation and grasps, without consumable accessory, process and use cost extremely low.The processing cost of a set of impact cone and impact shoe only has about 300 yuan, and can creep into more than 500 meters on loose sand and gravel stratum, quicksand formation, solution-cavity filling thing stratum etc., cost is extremely low;
(2) drilling efficiency is high, on loose sand and gravel stratum, quicksand formation, solution-cavity filling thing stratum, does not need deslagging, per hourly creeps into more than 20 meters, improves 3-5 doubly than similar drilling tool;
(3) drilling tool can propose outside hole at any time, and opens the passage between sleeve pipe and stratum simultaneously, avoids boring to scrap, and can change little one-level drilling tool at any time and creep into relatively large stone, or carry out depthkeeping, fixed point get core sampling, do the work such as pumping test;
(4) impact force of impactor acts directly in impact cone and impingement shoe, and ballistic work loss is little, and drilling efficiency is high, and borehole perpendicularity can be protected.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
Below by embodiment also by reference to the accompanying drawings, the utility model is described in further detail:
Down-the-hole impact cone as shown in Figure 1, forms primarily of drilling rod 1, block stamp 2, impactor 3, impact cone 4, impingement shoe 5, sleeve pipe 6.
The impactor 3 of drilling rod 1, built-in block stamp 2 can directly be bought finished product and install, and the lower end of drilling rod 1 and the upper end of impactor 3 are threaded connection.Be provided with air-supply passage in drilling rod 1, wind sent into room in impactor 3, after interior room is closed, impactor 3 starts at once because interior chamber pressure increases, and built-in block stamp 2 is impacted up and down with high-frequency.This part has continued to use structure and the connected mode of drilling rod 1 and impactor 3 in traditional down-hole hammer, does not repeat them here.
Sleeve pipe 6 is arranged on outside impactor 3, is also provided with impact cone 4 and impingement shoe 5 in sleeve pipe 6.Wherein, the top of impact cone 4 is stretched in impactor 3 and is connected by spline with impactor 3, and by being arranged on the latch locking in vertical bar hole, impact cone 4 can be moved up and down by relative impact device 3 within the specific limits.So-called " in certain limit " refers to the extreme position that latch moves up and down in vertical bar hole.Impact cone 4 has continued to use the connected mode of taper bit and impactor in traditional down-hole hammer with the connected mode of impactor 3, the structure qualification of impactee 3, and impact cone 4 is also uniquely limited with the connected mode of impactor 3.
Be provided with the air vent 4a of " L " shape on the top of impact cone 4, air vent 4a comprises vertical section and horizontal segment, and vertical section is arranged on the axle center position of impact cone 4.The middle part of impact cone 4 is with step 4b, and the diameter of step 4b is less than the internal diameter of sleeve pipe 6, thus freely movable in sleeve pipe 6.Preferably, step 4b has up/down perforation and the circumferentially uniform hole 4d that cools down, the step that impact cone 4 contacts with impingement shoe 5 designs hole of cooling down, avoid because two end faces have air accumulation to cause contact not exclusively.The bottom of impact cone 4 is with conical head 4c.
Impingement shoe 5 is positioned at the below of impact cone 4 and is threaded with sleeve pipe 6, the lower end of impingement shoe 5 is tapered and reach outside sleeve pipe 6, in impingement shoe 5, have the passage passed through for impact cone 4 bottom, and the conicity angles alpha of conical head 4c is equal with the taper angle of impingement shoe 5 lower end.The conicity angles alpha of conical head 4c is 90 ~ 120 °.
When step 4b is pressed in the top of impingement shoe 5, the conical surface of conical head 4c is just in time coplanar with the impingement shoe 5 lower end conical surface.
During boring, by under whole down-the-hole impact cone at the bottom of hand-hole, start ground air compressor and blow in drilling rod 1, now fit tightly bottom impact cone 4 top and block stamp 2, room in impactor 3 is closed, impactor 3 starts at once because interior chamber pressure increases, and block stamp 2 bores 4 tops with high-frequency striking impact.Impact cone 4 is direct centrifugation stratum downwards, and by step 4b, impact force is passed to impingement shoe 5 simultaneously, and force impingement shoe 5 to be crept into downwards, power is passed to sleeve pipe 6 by screw thread by impingement shoe 5, drives sleeve pipe 6 to follow up downwards.
Drilling rod 1, the band impactor 3 of block stamp 2, impact cone 4 and impingement shoe 5 form the drilling tool of down-the-hole impact cone.As needed to pull out of hole, only need carry drilling rod 1 on ground, drilling tool in hole all can be proposed, open sleeve pipe 6 and the passage on stratum immediately, carry out fixed point and get core sampling, pumping test etc.As continued to creep into, again will enter under drilling tool in sleeve pipe, repeat above-mentioned steps.As relatively large stone, can propose drilling tool in hole, the passage between sleeve pipe 6 and stratum is opened immediately, under enter little one-level tup and impact, after being smashed, then under enter the drilling tool of down-the-hole impact cone, continue pipe-following drilling.