阅读说明：本技术 岩溶发育区旋挖地雷式挤压钻头溶洞处理方法 (Karst development area rotary excavating mine type extrusion drill bit karst cave treatment method ) 是由 雷斌 纪坚锋 陈小慧 童心 雷帆 洪雨娇 刘浩贤 林志豪 于 2020-07-06 设计创作，主要内容包括：本发明涉及旋挖灌注桩溶洞处理的技术领域,公开了岩溶发育区旋挖地雷式挤压钻头溶洞处理方法,包括以下施工步骤：S1、旋挖钻进遇溶洞后,及时进行停钻；S2、根据溶洞分布情况,进行粘土和片石回填；S3、检查旋挖钻机并更换地雷式挤压钻头,再入孔,慢速、加压钻进；S4、重复进行回填和挤压,直至溶洞段形成新的孔壁为止；S5、溶洞处理完毕后,旋挖钻机更换正常的旋挖钻进钻头,继续进行钻进；片石和粘土混合物充填进入溶洞内,通过反复多次的回填和挤压操作,起到孔内起到形成新的护壁结构,确保溶洞段被充填和稳定,再更换回旋挖钻进钻头继续钻孔,通过反复回填、挤压处理,可有效的对溶洞进行充填处理,防止塌孔和泥浆漏失,确保下一步钻进成孔。(The invention relates to the technical field of rotary excavating cast-in-place pile karst cave treatment, and discloses a rotary excavating land mine type extrusion drill bit karst cave treatment method for a karst development area, which comprises the following construction steps: s1, stopping drilling in time after the rotary drilling meets the karst cave; s2, backfilling clay and rubbles according to the distribution condition of the karst caves; s3, checking the rotary drilling rig, replacing a land mine type extrusion drill bit, then entering the hole, and drilling at a low speed and under pressure; s4, repeating backfilling and extrusion until a new hole wall is formed at the karst cave section; s5, after the karst cave treatment is finished, replacing a normal rotary drilling bit by the rotary drilling rig, and continuing to drill; filling a mixture of the rubble and the clay into the karst cave, repeatedly backfilling and extruding for many times to form a new retaining wall structure in the karst cave, ensuring that the karst cave section is filled and stabilized, replacing the rotary excavation drilling drill bit to continue drilling, and effectively filling the karst cave by repeatedly backfilling and extruding, so that hole collapse and slurry leakage are prevented, and the next step of drilling is ensured.)

1. The method for processing the karst cave of the rotary mine type extrusion drill bit in the karst development area is characterized by comprising the following construction steps:

s1, stopping drilling in time after the rotary drilling meets the karst cave;

s2, backfilling clay and rubbles according to the distribution condition of the karst caves;

S3, checking the rotary drilling rig, replacing a land mine type extrusion drill bit, then entering the hole, and drilling at a low speed and under pressure;

s4, repeating backfilling and extrusion until a new hole wall is formed at the karst cave section;

and S5, after the karst cave treatment is finished, replacing the normal rotary drilling bit by the rotary drilling rig, and continuing to drill.

2. The method for treating the karst development area cave by rotary excavating a landmine type extrusion drill bit according to claim 1, wherein the backfill height of the clay and the rubble in the step S2 is more than 2 m higher than the top of the cave.

3. The method for treating karst development area rotary mine type extrusion drill bit karst cave according to claim 2, wherein in the continuous drilling process of the step S5, the performance of mud in the hole is kept, and the stability of the hole wall is ensured.

4. The karst development area rotary excavating land mine type extrusion drill bit karst cave processing method according to any one of claims 1 to 3, wherein the land mine type extrusion drill bit comprises a connecting section, a straight hole diameter-protecting section and an extrusion section, and the connecting section, the straight hole diameter-protecting section and the extrusion section are fixedly connected in sequence from top to bottom.

5. The method for processing the karst development area rotary excavating landmine type extrusion drill bit karst cave according to claim 4, wherein the connecting section is in a circular truncated cone shape and is arranged in a small-top and large-bottom manner.

6. The method for treating karst development area rotary excavating mine type extrusion drill bit karst cave according to claim 5, wherein the straight hole diameter-retaining section is cylindrical.

7. The method for treating karst development area rotary excavating mine type extrusion drill bit karst cave according to claim 6, wherein the diameter of the straight hole diameter-keeping section is equal to the design diameter of a pile hole.

8. The method for processing the karst development area rotary mine type extrusion drill bit karst cave according to claim 7, wherein the extrusion section is in a circular truncated cone shape and is arranged in a large-sized mode and a small-sized mode.

9. The method for rotary excavating mine type extrusion drill bit karst cave treatment in the karst development area according to any one of claims 1 to 3, wherein the mine type extrusion drill bit is arranged in a completely closed shape.

10. The method for treating the karst development area rotary excavating mine type extrusion drill bit karst cave according to claim 9, wherein the mine type extrusion drill bit is welded by steel plates, the interior of the mine type extrusion drill bit is hollow, and the thickness of each steel plate is 2 cm.

Technical Field

The invention relates to the technical field of rotary excavating cast-in-place pile karst cave treatment, in particular to a rotary excavating landmine type extrusion drill bit karst cave treatment method in a karst development area.

Background

The cast-in-place pile is constructed in a karst development area, generally, a percussion or rotary drilling machine is adopted to drill for hole forming, when in percussion drilling, a cross hammer is used for impact extrusion and crushing a stratum, and drilling slag is returned upwards through mud circulation; when a karst cave is met, firstly, a mixture of the rubble and the clay is backfilled, then impact extrusion is carried out by using a hammer, the mixture of the rubble and the clay is filled into the karst cave, a complete hole wall is formed again, and punching and drilling have certain advantages when the karst cave is processed, but in the drilling of an upper soil layer, the impact construction speed is low, the mud quantity is large, and the field civilization construction condition is poor.

In order to improve the drilling efficiency, the rotary drilling rig is also frequently used for construction of a karst cave pile hole in a karst development area, and the high efficiency of rotary drilling on a soil layer section is fully exerted; however, for the drilling of the karst cave section, the rotary drilling rig lacks an impact function, so that the karst cave treatment capability is weak, and a method for carrying out karst cave treatment in a karst development area by using the rotary drilling rig is lacked.

Disclosure of Invention

The invention aims to provide a rotary mine type extrusion drill bit karst cave treatment method for a karst development area, and aims to solve the problem that a rotary drilling rig is not used for carrying out karst development area karst cave treatment in the prior art.

The invention is realized in such a way that a rotary mine type extrusion drill bit karst cave treatment method in a karst development area comprises the following construction steps:

s1, stopping drilling in time after the rotary drilling meets the karst cave;

s2, backfilling clay and rubbles according to the distribution condition of the karst caves;

s3, checking the rotary drilling rig, replacing a land mine type extrusion drill bit, then entering the hole, and drilling at a low speed and under pressure;

s4, repeating backfilling and extrusion until a new hole wall is formed at the karst cave section;

and S5, after the karst cave treatment is finished, replacing the normal rotary drilling bit by the rotary drilling rig, and continuing to drill.

Further, the backfill height of the clay and the rubbles in the step S2 is more than 2 meters higher than the top of the cave.

Further, in the continuous drilling process of the step S5, the performance of slurry in the hole is kept, and the stability of the hole wall is ensured.

Further, the land mine type extrusion drill bit comprises a connecting section, a straight hole diameter-protecting section and an extrusion section, wherein the connecting section, the straight hole diameter-protecting section and the extrusion section are sequentially and fixedly connected from top to bottom.

Furthermore, the connecting section is in a round table shape and is arranged in a small-upper-part and large-lower-part manner.

Further, the diameter-protecting section of the straight hole is cylindrical.

Further, the diameter of the straight hole diameter-keeping section is equal to the design diameter of the pile hole.

Furthermore, the extrusion section is round platform form, and is big-end-up's arrangement.

Further, the mine extrusion drill bit is arranged in a completely closed shape.

Further, the mine type extrusion drill bit is welded by steel plates, the interior of the mine type extrusion drill bit is hollow, and the thickness of each steel plate is 2 cm.

Compared with the prior art, the rotary excavating land mine type extrusion drill bit karst cave processing method for the karst development area comprises the steps that a rotary excavating drilling machine is connected with a rotary excavating drilling drill bit for drilling, clay and rubbles are backfilled in a pile hole after karst cave is met, then the land mine type extrusion drill bit is replaced, slow pressurizing drilling is carried out in the pile hole, the land mine type extrusion drill bit is connected with a rotary excavating drilling machine inlet hole, the drill bit is in downward rotary drilling through a downward pressurizing device of the rotary excavating drilling machine, a backfill layer in the hole is transversely and simultaneously extruded towards the bottom and the side wall of the drill hole through the bottom of the drill bit, a mixture of the rubbles and the clay is filled into the karst cave, a new protective wall structure is formed after the drill bit is started to rotate in the hole through repeated backfilling and extruding operations, the karst cave section is ensured to be filled and stabilized, then the rotary excavating drilling drill bit is replaced for continuously drilling, and the, the karst cave can be effectively filled, hole collapse and slurry leakage are prevented, and the next drilling for forming holes is ensured; the mine type extrusion drill bit is connected to the rotary drilling rig, so that the rotary drilling rig has a good extrusion function, and the application range of the rotary drilling rig is widened.

Drawings

FIG. 1 is a schematic illustration of the construction process of the present invention;

FIG. 2 is a schematic structural view of a mine extrusion drill bit of the present invention;

FIG. 3 is a schematic view of pile holes of the present invention before backfilling;

FIG. 4 is a schematic view of a pile hole after backfilling in accordance with the present invention;

FIG. 5 is a schematic view of the present invention as it is being drilled with a mine extrusion drill bit;

FIG. 6 is a schematic diagram of the present invention during continued drilling with a rotary drilling bit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-6, preferred embodiments of the present invention are shown.

The method for processing karst development area karst cave by rotary excavation landmine type extrusion drill bit can be used for karst development area karst cave construction, and certainly, can also be used for other pile hole construction, and is not limited to the application in the embodiment.

The method for treating the karst cave of the rotary mine type extrusion drill bit in the karst development area comprises the following construction steps:

s1, stopping drilling in time after the rotary drilling meets the karst cave 11;

s2, backfilling clay and rubbles according to the distribution condition of the karst caves 11;

s3, checking the rotary drilling rig, replacing the land mine type extrusion drill bit 12, then entering the hole, and drilling at a low speed and under pressure;

s4, repeating backfilling and extrusion until a new hole wall is formed at the section 11 of the karst cave;

and S5, after the karst cave 11 is processed, replacing the normal rotary drilling bit 13 by the rotary drilling rig, and continuing to drill.

The rotary excavating land mine type extrusion drill bit karst cave processing method for the karst development area comprises the steps that a rotary excavating drilling machine is connected with a rotary excavating drilling drill bit 13 for drilling, clay and rubbles are backfilled in a pile hole after the rotary excavating drilling drill bit meets a karst cave 11, then a land mine type extrusion drill bit 12 is replaced, slow pressurizing drilling is carried out in the pile hole, the land mine type extrusion drill bit 12 is connected with a rotary excavating drilling machine inlet hole, the drill bit is driven to downwards and transversely extrude the backfill layer 17 in the hole towards the bottom and the side wall of the drill hole through a downward pressurizing device of the rotary excavating drilling machine in the downward rotary drilling process, a rubble and clay mixture is filled into the karst cave 11, the drill bit is driven to be in the hole to form a new protective wall structure through repeated backfilling and extruding operations, the section of the karst cave 11 is filled and stable, then the rotary excavating drilling drill bit 13 is replaced for continuously drilling, and the karst cave 11 can be effectively filled through repeated backfill, hole collapse and slurry leakage are prevented, and the next step of drilling is ensured; the landmine type extrusion drill bit 12 is connected to the rotary drilling rig, so that the rotary drilling rig has a good extrusion function, and the application range of the rotary drilling rig is widened.

Specifically, the backfill height of the clay and the rubble in the step S2 is higher than the top of the cave 11 by more than 2 meters, so that sufficient backfill materials are ensured to fill the cave 11, and the cave 11 is ensured to form a new protective wall.

During the drilling process continued in step S5, the slurry properties in the hole are maintained to ensure the stability of the hole wall.

The mine type extrusion drill bit 12 comprises a connecting section 14, a straight hole diameter-protecting section 15 and an extrusion section 16, wherein the connecting section 14, the straight hole diameter-protecting section 15 and the extrusion section 16 are fixedly connected in sequence from top to bottom.

The connecting section 14 is used for being connected with a rotary drilling rig, the connecting section 14 is designed in a standard mode, successful connection with rotary drilling rigs of various brands is guaranteed, and applicability of the land mine type extrusion drill bit 12 is improved; the landmine type extrusion drill bit 12 is simple to manufacture, convenient to use, low in manufacturing and using cost and good in economical efficiency, and the drill bit can be repeatedly used.

The connecting section 14 is in a circular truncated cone shape and is arranged in a large manner from top to bottom, so that the drill bit is conveniently connected with a drill rod of the rotary drilling rig, and the connection accuracy is improved.

The straight hole diameter-keeping section 15 is cylindrical, the diameter of the straight hole diameter-keeping section 15 is equal to the designed diameter of the pile hole, the diameter of the pile hole can be ensured during drilling and extrusion, a drilling guiding effect can be achieved, the drill bit is not deviated, and the drill bit can be conveniently and smoothly drilled by a subsequent rotary drilling drill bit.

The extrusion section 16 is in a circular truncated cone shape and is arranged in a large-sized and small-sized mode, so that a drill bit can conveniently enter the backfill layer 17, the circular truncated cone and the inclined plane with the large size and the small size can fully exert the extrusion effect, and downward pressure and surrounding pressure are generated on the backfill layer 17.

The landmine type extrusion drill bit 12 is arranged in a completely closed shape, so that sundries are prevented from entering the inside of the drill bit and affecting the use of the drill bit.

The landmine type extrusion drill bit 12 is welded by steel plates, the inside of the landmine type extrusion drill bit is hollow, the thickness of the steel plate is 2cm, the drill bit is guaranteed to have enough strength, deformation in the drilling process is avoided, the inside of the landmine type extrusion drill bit is hollow, materials can be saved, the cost is reduced, the weight of the drill bit is also reduced, and too large burden on a rotary drilling rig is avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.