阅读说明：本技术 伸缩式钻进防护罩结构 (Telescopic drilling protective cover structure ) 是由 尚增弟 邹俊峰 雷斌 李红波 雷帆 沙桢辉 胡静 刘福胜 于 2019-11-15 设计创作，主要内容包括：本发明涉及钻进防护罩的技术领域,公开了伸缩式钻进防护罩结构,包括防护罩、固定绳以及拉伸绳,防护罩包括多个中罩体及底罩体,相邻中罩体呈叠套布置或展开布置,底罩体处于中罩体的下方,且与中罩体呈叠套布置或展开布置,相邻中罩体通过固定绳呈相对固定布置,拉伸绳的一端呈活动布置且提供拉伸力,拉伸绳的另一端分别贯穿各个中罩体,且延伸连接底罩体；进行作业时,底罩体垂放至钻孔的正上方。进行潜孔锤钻进时,潜孔锤振动破碎的岩渣、土渣,在气流影响下,朝上喷出,被底罩体阻挡,随着风压减小及在自重作用下,岩渣、土渣堆积于孔口地面上,有效避免岩渣、土渣误规则飞溅,有效控制施工过程中的岩渣、土渣等污染,具有显著的环保效果。(The invention relates to the technical field of drilling protective covers, and discloses a telescopic drilling protective cover structure which comprises a protective cover, a fixed rope and a tensile rope, wherein the protective cover comprises a plurality of middle cover bodies and bottom cover bodies, the adjacent middle cover bodies are arranged in a sleeved mode or in an unfolded mode, the bottom cover bodies are positioned below the middle cover bodies and are arranged in a sleeved mode or in an unfolded mode with the middle cover bodies, the adjacent middle cover bodies are oppositely and fixedly arranged through the fixed rope, one end of the tensile rope is movably arranged and provides tensile force, and the other end of the tensile rope penetrates through each middle cover body respectively and is connected with the bottom cover bodies in an extending mode; when the drilling machine is operated, the bottom cover body is vertically placed right above the drill hole. When the down-the-hole hammer drills, the down-the-hole hammer vibrates and crushes rock slag and soil slag, under the influence of air flow, the rock slag and the soil slag are ejected upwards and blocked by the bottom cover body, and the rock slag and the soil slag are accumulated on the ground of an orifice along with the reduction of air pressure and under the action of self weight, so that the rock slag and the soil slag are effectively prevented from splashing by mistake and rules, the pollution of the rock slag, the soil slag and the like in the construction process is effectively controlled, and the down-the-hole hammer has a remarkable environment-.)

1. The telescopic drilling protective cover structure is characterized by comprising a protective cover, a fixing rope and a stretching rope, wherein the protective cover comprises a plurality of middle cover bodies and bottom cover bodies, the adjacent middle cover bodies are arranged in a sleeved mode or in an unfolded mode, the bottom cover bodies are arranged below the middle cover bodies and arranged in a sleeved mode or in an unfolded mode, the adjacent middle cover bodies are arranged in a relatively fixed mode through the fixing rope, one end of the stretching rope is movably arranged and provides stretching force, and the other end of the stretching rope penetrates through each middle cover body respectively and is connected with the bottom cover bodies in an extending mode; when the drilling machine works, the bottom cover body is vertically placed right above the drilled hole.

2. The retractable drilling protective cover structure according to claim 1, wherein the middle cover body is provided with at least one connecting lifting lug, the connecting lifting lugs of the adjacent middle cover bodies are arranged in an up-down corresponding manner, and two ends of the fixing rope are respectively connected with the connecting lifting lugs of the adjacent middle cover bodies; the bottom cover body is provided with at least one connecting lifting lug, the connecting lifting lug of the middle cover body and the connecting lifting lug of the bottom cover body are arranged in an up-down corresponding mode, and two ends of the fixing rope are respectively connected with the connecting lifting lug of the middle cover body and the connecting lifting lug of the bottom cover body.

3. The telescoping drilling protective cover structure of claim 2, wherein said central cover body is provided with at least three said attachment lugs, said three attachment lugs being equally spaced apart along a circumference of said central cover body, and said three attachment lugs being arranged in a triangular pattern.

4. The retractable drilling protective cover structure according to claim 2, wherein the connecting lifting lug comprises two ear plates arranged at intervals and a shaft pin, two ends of the fixing rope respectively form fixing parts, and the shaft pin respectively penetrates through the fixing parts and the two ear plates.

5. The telescoping drilling shield structure of any of claims 1-4, wherein said middle shield is in a frustoconical arrangement with a small top and a large bottom; along top-down direction, the well cover body has longitudinal height, the fixed rope has longitudinal length, longitudinal height is greater than longitudinal length.

6. The retractable drilling protective cover structure according to claim 5, wherein the middle cover body comprises an upper reinforcing ring, a cover plate and a lower reinforcing ring, the upper reinforcing ring is fixed on the top of the cover plate, the lower reinforcing ring is fixed on the bottom of the cover plate, and the cover plate is obliquely arranged outwards along the top-down direction; the distance between the upper reinforcement ring and the lower reinforcement ring forms the longitudinal height.

7. The telescoping drilling shield structure according to any one of claims 1-4, wherein said central shield body is provided with at least one lifting lug, said bottom shield body is provided with at least one bottom lug, and said tensile cord extends through each of said lifting lugs and is connected to said bottom lug.

8. The telescoping drilling shield structure of claim 7, wherein the telescoping drilling shield structure comprises a hoist, one end of the tensile cord is connected to the hoist, and the hoist is activated to provide the tensile cord with a tensile force.

9. The retractable drilling protective cover structure according to claim 8, wherein the middle cover body is provided with two lifting lugs, the bottom cover body is provided with two bottom lugs, and the two lifting lugs are correspondingly arranged along the radial direction of the middle cover body and are equidistantly distributed on two sides of the middle cover body; the telescopic drilling protective cover structure comprises two tensile ropes and two winches, the two tensile ropes and the two lifting lugs of a single middle cover body are arranged in a one-to-one correspondence mode, the two tensile ropes respectively penetrate through the lifting lugs of each middle cover body and are fixedly connected with the bottom lifting lugs in an extending mode; the two winches are arranged in one-to-one correspondence with the two tensile ropes.

10. The telescoping drilling shield structure of claim 9, wherein two of said winches are in a synchronous start or synchronous stop arrangement.

Technical Field

The invention relates to the technical field of drilling protective covers, in particular to a telescopic drilling protective cover structure.

Background

When the cast-in-place pile is drilled by a large-diameter down-the-hole hammer, high wind pressure provided by an air compressor is used as power, the high wind pressure enters a down-the-hole hammer impactor to drive a down-the-hole hammer drill bit to perform high-speed reciprocating impact operation, and residue soil and rock debris crushed by the down-the-hole hammer are carried and discharged by the high wind pressure along with a gap between a down-the-hole hammer drill rod and a hole wall and are scattered to the ground.

When the down-the-hole hammer drills into the soil layer section, the muck is sprayed out of the hole opening and splashes randomly, and dust floats; when the down-the-hole hammer drills in a rock stratum, a large amount of rock slag and rock debris are sprayed out of an orifice and are mixed with large dust, so that the air quality and visibility around the orifice are seriously influenced, and the field civilized construction condition is poor.

In order to solve the problems of muck, rock debris and dust generated at a hole opening in the drilling process of the down-the-hole hammer, a specially-assigned person is generally adopted to spray water at the hole opening so as to control the pollution generated at the hole opening, but a good effect is often difficult to achieve.

Disclosure of Invention

The invention aims to provide a telescopic drilling protective cover structure, and aims to solve the problems of drilling construction of a down-the-hole hammer and rock slag pollution in the prior art.

The invention is realized in such a way, the telescopic drilling protective cover structure comprises a protective cover, a fixed rope and a tensile rope, wherein the protective cover comprises a plurality of middle cover bodies and bottom cover bodies, the adjacent middle cover bodies are arranged in a nesting manner or in an unfolding manner, the bottom cover bodies are positioned below the middle cover bodies and arranged in a nesting manner or in an unfolding manner with the middle cover bodies, the adjacent middle cover bodies are relatively fixedly arranged through the fixed rope, one end of the tensile rope is movably arranged and provides tensile force, and the other end of the tensile rope respectively penetrates through each middle cover body and is connected with the bottom cover bodies in an extending manner; when the drilling machine works, the bottom cover body is vertically placed right above the drill hole.

Furthermore, the middle cover body is provided with at least one connecting lifting lug, the connecting lifting lugs of the adjacent middle cover bodies are arranged in an up-down corresponding manner, and two ends of the fixing rope are respectively connected with the connecting lifting lugs of the adjacent middle cover bodies; the bottom cover body is provided with at least one connecting lifting lug, the connecting lifting lug of the middle cover body and the connecting lifting lug of the bottom cover body are arranged in an up-down corresponding mode, and two ends of the fixing rope are respectively connected with the connecting lifting lug of the middle cover body and the connecting lifting lug of the bottom cover body.

Furthermore, the middle cover body is provided with at least three connecting lifting lugs, the three connecting lifting lugs are arranged at equal intervals along the circumference of the middle cover body, and the three connecting lifting lugs are arranged in a triangular shape.

Furthermore, the connecting lifting lug comprises two lug plates and a shaft pin which are arranged at intervals, fixing parts are respectively formed at two ends of the fixing rope, and the shaft pin penetrates through the fixing parts and the two lug plates respectively.

Furthermore, the middle cover body is arranged in a frustum shape with a small upper part and a big lower part; along top-down direction, the well cover body has longitudinal height, the fixed rope has longitudinal length, longitudinal height is greater than longitudinal length.

Furthermore, the middle cover body comprises an upper reinforcing ring, a cover plate and a lower reinforcing ring, the upper reinforcing ring is fixed at the top of the cover plate, the lower reinforcing ring is fixed at the bottom of the cover plate, and the cover plate is outwards obliquely arranged along the direction from top to bottom; the distance between the upper reinforcement ring and the lower reinforcement ring forms the longitudinal height.

Furthermore, the middle cover body is provided with at least one lifting lug, the bottom cover body is provided with at least one bottom lifting lug, and the tensile rope penetrates through the lifting lugs respectively and is connected with the bottom lifting lugs in an extending mode.

Furthermore, telescopic drilling protection casing structure includes the hoist engine, the one end of tensile rope is connected the hoist engine, the hoist engine starts, realizes that tensile rope possesses the tensile force.

Furthermore, the middle cover body is provided with two lifting lugs, the bottom cover body is provided with two bottom lugs, and the two lifting lugs are correspondingly arranged along the radial direction of the middle cover body and are distributed on two sides of the middle cover body at equal intervals; the telescopic drilling protective cover structure comprises two tensile ropes and two winches, the two tensile ropes and the two lifting lugs of a single middle cover body are arranged in a one-to-one correspondence mode, the two tensile ropes respectively penetrate through the lifting lugs of each middle cover body and are fixedly connected with the bottom lifting lugs in an extending mode; the two winches are arranged in one-to-one correspondence with the two tensile ropes.

Furthermore, the two winches are synchronously started or synchronously stopped.

Compared with the prior art, the telescopic drilling protective cover structure provided by the invention has the advantages that before down-the-hole hammer drilling construction operation is carried out, the tensile force is cancelled by the tensile rope, each middle cover body and the bottom cover body are arranged in an unfolded manner, and the bottom cover body is vertically placed right above a drilled hole; in addition, when the down-the-hole hammer drills, the middle cover body and the bottom cover body are arranged in a sleeved mode through the tensile rope along with the change of the drilling depth, or the adjacent middle cover bodies are arranged in a sleeved mode, the telescopic control of the protective cover structure is achieved, and the drilling construction requirements of different down-the-hole hammers are met.

Drawings

FIG. 1 is a schematic structural layout of a telescoping drilling shield arrangement according to the present invention;

FIG. 2 is a perspective view of a shield of the telescoping drilling shield construction provided by the present invention;

FIG. 3 is a perspective view of the telescoping drilling shroud construction of the present invention with the shroud in a nested configuration;

FIG. 4 is a perspective view of the middle housing of the telescoping drilling shield structure provided by the present invention;

FIG. 5 is a schematic section A of a telescoping drilling shield configuration provided by the present invention;

FIG. 6 is a schematic view of a portion B of the telescoping drilling shield configuration provided by the present invention;

FIG. 7 is a perspective view of an attachment lug of the telescoping drilling shield construction provided in accordance with the present invention;

FIG. 8 is a perspective view of the present invention providing a hoist coupled to a shroud;

FIG. 9 is a schematic view of the bottom and middle covers provided by the present invention.

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. 1-9, preferred embodiments of the present invention are provided.

The telescopic drilling protective cover structure provided by the invention is used for solving the problems of rock slag, soil slag and dust pollution in the drilling construction of a down-the-hole hammer.

The telescopic drilling protective cover structure comprises a protective cover 10, a fixing rope 30 and a stretching rope 40, wherein the protective cover 10 comprises a plurality of middle cover bodies 11 and bottom cover bodies 12, the adjacent middle cover bodies 11 are arranged in a sleeved mode or in an unfolded mode, the bottom cover bodies 12 are arranged below the middle cover bodies 11 and are arranged in a sleeved mode or in an unfolded mode with the middle cover bodies 11, the adjacent middle cover bodies 11 are arranged in a relatively fixed mode through the fixing rope 30, one end of the stretching rope 40 is movably arranged and provides stretching force, and the other end of the stretching rope 40 penetrates through each middle cover body 11 and is connected with the bottom cover bodies 12 in an extending mode; during operation, the bottom cover 12 is suspended over the borehole.

According to the telescopic drilling protective cover structure, before down-the-hole hammer drilling construction operation is carried out, the tensile force is cancelled by the tensile rope 40, each middle cover body 11 and each bottom cover body 12 are arranged in an unfolded mode, the bottom cover bodies 12 are vertically placed right above a drill hole, when the down-the-hole hammer is drilled, rock slag and soil slag which are broken by vibration of the down-the-hole hammer are ejected upwards under the influence of air flow and are blocked by the bottom cover bodies 12 after flying out of the drill hole, and the rock slag and the soil slag are accumulated on the ground of the hole opening under the action of reduction of air pressure and self weight, so that the rock slag and the soil slag are effectively prevented from splashing by mistake and regulation, the pollution of the rock slag, the soil slag and the like in the construction process is effectively controlled, and the environment; in addition, when the down-the-hole hammer drills, the middle cover body 11 and the bottom cover body 12 are arranged in a sleeved mode through the tensile rope 40 along with the change of the drilling depth, or the adjacent middle cover bodies 11 are arranged in a sleeved mode, the telescopic control of the structure of the protective cover 10 is achieved, and the drilling construction requirements of different down-the-hole hammers are met.

The middle cover body 11 is provided with at least one connecting lifting lug 50, the connecting lifting lugs 50 of the adjacent middle cover bodies 11 are arranged in an up-down corresponding manner, and two ends of the fixing rope 30 are respectively connected with the connecting lifting lugs 50 of the adjacent middle cover bodies 11; the bottom cover body 12 is provided with at least one connecting lifting lug 50, the connecting lifting lug 50 of the middle cover body 11 and the connecting lifting lug 50 of the bottom cover body 12 are arranged in an up-down corresponding manner, and two ends of the fixing rope 30 are respectively connected with the connecting lifting lug 50 of the middle cover body 11 and the connecting lifting lug 50 of the bottom cover body 12; the adjacent middle cover body 11 is relatively fixedly arranged through a fixing rope 30, and the middle cover body 11 and the bottom cover body 12 are relatively fixedly arranged through the fixing rope 30; thereby integrating the middle cover body 11 and the bottom cover body 12 to realize the nesting arrangement or the unfolding arrangement.

Furthermore, the middle cover body 11 is provided with at least three connecting lifting lugs 50, the three connecting lifting lugs 50 are arranged at equal intervals along the circumference of the middle cover body 11, and the three connecting lifting lugs 50 are arranged in a triangular shape; with the arrangement, the protective cover 10 has more stability and reduces the shaking when being nested or unfolded.

The connecting lifting lug 50 comprises two lug plates 51 and a shaft pin 52 which are arranged at intervals, fixing parts are respectively formed at two ends of the fixing rope 30, and the shaft pin 52 respectively penetrates through the fixing parts and the two lug plates 51; the connection stability of the connection lug 50 and the fixing rope 30 is enhanced.

Furthermore, the ear plates 51 are arranged longitudinally and in a flat shape, the fixing portion is formed with a fixing hole, and the shaft pin 52 penetrates through the fixing hole and the two ear plates 51 respectively, so as to enhance the connection stability between the connecting lifting lug 50 and the fixing rope 30.

The bottom of the ear plate 51 is abutted against and fixed with the lower reinforcing ring 15, so that the arrangement of each ear plate 51 is convenient, and each ear plate 51 is arranged in a flush manner along the horizontal direction; and under the cooperation of the lower reinforcing ring 15 and the ear plate 51, the fulcrum force borne by the three connecting lifting lugs 50 can act on the lower reinforcing ring 15, so that the whole stress is better, and the lifting process is convenient to balance.

The lower reinforcing ring 15 is arranged in a circular shape, and the thickness of the lower reinforcing ring 15 is 6-8mm, so that the strength of the lower reinforcing ring 15 is ensured.

The top of the ear plate 51 is recessed downwards to form a mounting groove, when the middle cover bodies 11 and the bottom cover body 12 are arranged in a nested manner, or the adjacent middle cover bodies 11 are arranged in a nested manner, the fixing rope 30 is arranged in a bent manner, and the mounting groove is positioned between the adjacent middle cover bodies 11, or the mounting groove is positioned between the middle cover bodies 11 and the bottom cover body 12; therefore, the fixing rope 30 is partially embedded into the installation groove, the fixing rope 30 is effectively prevented from being extruded by the adjacent middle cover body 11, and the service life of the fixing rope 30 is prolonged.

The shaft pin 52 has two blocking positions, the fixing part is blocked on the blocking positions, and under the matching of the blocking positions and the fixing part, the shaking of the fixing part is reduced when the sleeve is overlapped or unfolded, and the stability of the sleeve is improved.

The shaft pin 52 has two blocking positions along the top-down direction, and each fixing rope 30 is arranged in a staggered manner, so that the stability of nesting or unfolding is improved.

The shaft pin 52 is provided with two clamping positions, namely a first clamping position and a second clamping position, the fixing part of the fixing rope 30 is clamped on the first clamping position, one end of the adjacent fixing rope 30 is fixed on the second clamping position, and the other end of the adjacent fixing rope 30 is fixed on the first clamping position of the adjacent shaft pin 52 below; the fixed ropes 30 are arranged in a staggered mode, and the stability of nesting or unfolding is improved.

The middle cover body 11 is arranged in a frustum shape with a small upper part and a big lower part; the middle cover body 11 has a longitudinal height from top to bottom, the fixing rope 30 has a longitudinal length, and the longitudinal height is greater than the longitudinal length; thus, the top of each middle cover 11 is embedded into the upper middle cover 11; thereby facilitating the nesting arrangement of the respective middle shields 11.

The bottom cover body 12 has a longitudinal height, and the longitudinal height of the bottom cover body 12 is consistent with that of the middle cover body 11; thus, the top of the bottom cover body 12 is embedded inside the upper middle cover body 11; thereby facilitating the nesting arrangement of the bottom shell 12 with the middle shell 11.

The middle cover body 11 comprises an upper reinforcing ring 14, a cover plate 13 and a lower reinforcing ring 15, the upper reinforcing ring 14 is fixed at the top of the cover plate 13, the lower reinforcing ring 15 is fixed at the bottom of the cover plate 13, and the cover plate 13 is obliquely arranged outwards along the top-down direction; the distance between the upper reinforcement ring 14 and the lower reinforcement ring 15 forms the longitudinal height; the cover plate 13 is arranged in an inclined mode outwards, so that rock debris and soil debris can be guided conveniently and can be collected conveniently.

And the whole structural strength is improved under the action of the upper reinforcing ring 14 and the lower reinforcing ring 15.

The middle cover body 11 is made of a stainless steel plate, and the thickness of the cover plate 13 is 2-3mm, so that the enough strength of the cover body is ensured.

The upper reinforcing ring 14 is arranged in a circular shape, and the thickness of the upper reinforcing ring is 1-3mm, so that the cover plate 13 is effectively prevented from being elastically deformed.

From top to bottom, a gap is formed between adjacent cover plates 13, and part of rock slag and soil slag are influenced by airflow and are discharged from the gap; because the longitudinal height is greater than the longitudinal length, the bottom of the cover plate 13 blocks the rock slag and the soil slag, the flow velocity of the rock slag and the soil slag is reduced, and the large-scale pollution caused by the rock slag and the soil slag is avoided.

In addition, the cover plate 13 is obliquely arranged, so that rock slag and soil slag passing through the gap can be guided, and the rock slag and the soil slag can be conveniently collected in a centralized manner.

The cover plate 13 is provided with an outward outer end face, the outer end face of the cover plate 13 is provided with a positioning block, and the inner end of the positioning block is fixed on the outer end face of the cover plate 13; when the stack is arranged to the final position, the outer end of the positioning block abuts against the inner end face of the adjacent cover plate 13; like this, avoid overlapping the cover to arrange, the shift position is too big, causes the damage of well cover body, simultaneously, when expanding, reduces rocking of adjacent well cover body 11, provides the stability of expanding.

The inner ends of the positioning blocks are arranged in a flush manner, inclined planes are formed at the inner ends of the positioning blocks, and the inclination angles of the inclined planes are consistent with the inclination angle of the cover plate 13; this facilitates the cooperative positioning between adjacent middle shells 11.

The bottom of locating piece supports and touches down beaded finish 15, and the locating piece acts on beaded finish 15 down for whole atress is better, and the process of drawing is convenient for balanced.

The outer end face of the cover plate 13 is provided with three positioning blocks, and the three positioning blocks and the three connecting lifting lugs 50 are arranged in a staggered and equidistant manner; set up like this, when the protection casing 10 structure is overlapped and is arranged or is expanded and arrange, three locating piece think with three connection lug 50 with the cooperation, make whole more have the stationarity, reduce and rock.

The middle cover body 11 is provided with at least one lifting lug 60, the bottom cover body 12 is provided with at least one bottom lifting lug, and the tensile ropes 40 respectively penetrate through the lifting lugs 60 and are connected with the bottom lifting lugs in an extending manner; in this way, the stretching rope 40 applies a stretching force to sequentially pull up the bottom cover 12 and each middle cover 11 from bottom to top, thereby realizing nesting arrangement.

The telescopic drilling protective cover 10 structurally comprises a winch 100, wherein one end of a tensile rope 40 is connected with the winch 100, and the winch 100 is started to realize that the tensile rope 40 has tensile force; facilitating automatic stretching or collection of the tensile cord 40; realizing automatic nesting arrangement or unfolding arrangement.

The middle cover body 11 is provided with two lifting lugs 60, the bottom cover body 12 is provided with two bottom lugs, and the two lifting lugs 60 are correspondingly arranged along the radial direction of the middle cover body 11 and are equidistantly distributed on two sides of the middle cover body 11; the telescopic drilling protective cover 10 structurally comprises two tensile ropes 40 and two winches 100, wherein the two tensile ropes 40 are arranged in one-to-one correspondence with the two lifting lugs 60 of a single middle cover body 11, and the two tensile ropes 40 respectively penetrate through the lifting lugs 60 of each middle cover body 11 and are connected with fixed bottom lifting lugs in an extending manner; the two winches 100 are arranged in one-to-one correspondence with the two tensile ropes 40; when the sleeve is sleeved or unfolded, the shaking of the middle cover body 11 and the bottom cover body 12 is reduced, and the stability of the sleeve is improved.

The two winches 100 are synchronously started or synchronously stopped; when the sleeve is sleeved or unfolded, the shaking of the middle cover body 11 and the bottom cover body 12 is reduced, and the stability of the sleeve is improved.

The lifting lug 60 of the middle cover body 11 at the lowest position is provided with a telescopic shaft, the telescopic shaft extends or contracts downwards, the telescopic shaft and the bottom lifting lug are arranged in an up-and-down corresponding mode, when the nesting state is changed into the unfolding state, the middle cover body 11 and the bottom cover body 12 are clamped too tightly, the bottom cover body 12 is pushed to deviate from the middle cover body 11 to move through downward extension of the telescopic shaft, and the unfolding state is facilitated.

The two lifting lugs 60 are respectively telescopic shafts, the two telescopic shafts are respectively arranged corresponding to the two bottom lugs up and down, and the two telescopic shafts are arranged in a synchronous starting manner; thus, the smoothness of deployment is improved.

The telescopic shaft is driven to rotate by a motor or driven to extend and retract by a hydraulic mode and the like.

The down-the-hole hammer drilling construction comprises a drilling machine 20, a drill rod and a down-the-hole hammer, wherein the drilling machine 20 drives the drill rod to rotate to drive the down-the-hole hammer to drill, and construction is achieved.

The drilling machine 20 is provided with a power head 21, and power is output through the power head 21 to provide driving force for the drill rod.

The drilling machine 20 is provided with a fixed pulley 22, and the stretching rope 40 passes through the fixed pulley 22, passes through the middle cover body 11 again and is connected with the bottom cover body 12 in an extending way; under the action of the fixed pulley 22, the extending direction of the tensile rope 40 is convenient to change, the winch 100 applies tensile force conveniently, and the damage to the tensile rope 40 is reduced.

A positioning ring 70 is arranged in the bottom cover body 12, a positioning hole 71 is formed in the middle of the positioning ring 70, a drill rod penetrates through the positioning hole 71, and the aperture of the positioning hole 71 is slightly larger than that of the drill rod, so that the drill rod is convenient to center under the action of the positioning ring 70; in the drilling process, the protective cover 10 is arranged in a nested manner from bottom to top along with the increase of the drilling depth, and the shaking of the bottom cover body 12 is reduced under the action of the positioning ring 70, so that the nested arrangement is facilitated.

The middle cover body 11 adjacent to the bottom cover body 12 is internally provided with a centering ring 80, a centering hole 81 is formed in the middle of the centering ring 80, the centering hole 81 and the positioning hole 71 are vertically and correspondingly arranged, the drill rod respectively penetrates through the positioning hole 71 and the centering hole 81, and under the action of the centering ring 80 on the positioning ring 70, the centering performance of the drill rod is enhanced, and the construction effect is improved.

Or the centering ring 80 is arranged at the top of the bottom cover body 12, the centering ring 80 and the bottom cover body 12 are arranged in a synchronous moving mode, and when the middle cover bodies 11 adjacent to the bottom cover body 12 are unfolded, the centering ring 80 is located in the adjacent middle cover bodies 11, so that the centering ring 80 is prevented from being exposed, and the centering ring 80 is prevented from influencing the overlapping arrangement of the middle cover bodies 11 adjacent to the bottom cover body 12.

A plurality of positioning strips 90 are arranged inside the bottom cover body 12, the positioning strips 90 are attached to the inner end face of the bottom cover body 12, the lower ends of the positioning strips 90 are fixedly arranged with the positioning ring 70, and the upper ends of the positioning strips 90 penetrate through the centering ring 80 and are movably arranged; in this way, the positioning strip 90 is prevented from interfering with the telescoping or deployment arrangement of the shield 10; in addition, under the action of the positioning strips 90, the shaking of the bottom cover body 12 and the middle cover body 11 is reduced when the protective cover 10 is in the nesting arrangement or the unfolding arrangement, so that the stability of the nesting arrangement or the stability of the unfolding arrangement is improved.

The upper end of the positioning strip 90 penetrates through the centering ring 80 and extends to the upper side of the centering ring 80, the extending length is determined according to the distance between the bottom cover body 12 and the middle cover body 11, and when the protection cover 10 is arranged in an unfolded mode, the upper end of the positioning strip 90 still penetrates through the centering ring 80, so that the protection cover 10 can be conveniently arranged in a sleeved mode or in an unfolded mode.

The bottom cover body 12 is vertically placed to a position 30-50 cm away from the ground through a stretching rope 40 to form an outer sleeve protective cover 10 structure surrounding the direction of the drill rod; the realization shelters from dregs, detritus, and again along with the wind pressure weakens and dead weight influence, dregs, detritus are all piled up near the drill way.