Construction equipment for anchoring tower crane type high and steep slope

文档序号:1691831 发布日期:2019-12-10 浏览:14次 中文

阅读说明:本技术 一种塔吊式高陡边坡锚固用施工装备 (Construction equipment for anchoring tower crane type high and steep slope ) 是由 张楷源 尹来容 罗彪 付宏渊 毛聪 曾铃 黄娟 汤宇 于 2019-08-29 设计创作,主要内容包括:一种塔吊式高陡边坡锚固用施工装备,包括吊篮、燕尾导轨、吊耳、锚孔钻机、固定销、锚孔识别装置、吊钩、工作钢丝绳、电动葫芦提升机、吊臂、电动葫芦限位传感器、塔吊固定座、回转机构、卷扬机牵引车、拖车、卷扬机;所述吊篮顶端设置有吊耳;所述燕尾导轨安装在吊篮底板处;所述锚杆钻机安装在吊篮底板上并与燕尾导轨配合,锚孔钻机可沿燕尾导轨移动;所述固定销安装在吊篮面向坡体一侧;所述工作钢丝绳用于连接吊钩与电动葫芦提升机;所述电动葫芦提升机安装在吊臂下方的导轨上;所述吊臂固定安装在回转机构上;所述回转机构安装在塔吊固定座上;所述塔吊固定座设置在坡顶处。(A tower crane type construction equipment for anchoring a high and steep slope comprises a hanging basket, a dovetail guide rail, a lifting lug, an anchor hole drilling machine, a fixed pin, an anchor hole identification device, a lifting hook, a working steel wire rope, an electric hoist lifting machine, a lifting arm, an electric hoist limit sensor, a tower crane fixing seat, a swing mechanism, a winch tractor, a trailer and a winch; a lifting lug is arranged at the top end of the hanging basket; the dovetail guide rail is arranged at the bottom plate of the hanging basket; the anchor rod drilling machine is arranged on the hanging basket bottom plate and matched with the dovetail guide rail, and the anchor hole drilling machine can move along the dovetail guide rail; the fixing pin is arranged on one side of the hanging basket facing the slope body; the working steel wire rope is used for connecting the lifting hook and the electric hoist lifter; the electric hoist hoister is arranged on a guide rail below the suspension arm; the suspension arm is fixedly arranged on the swing mechanism; the swing mechanism is arranged on the tower crane fixing seat; the tower crane fixing seat is arranged at the top of the slope.)

1. The utility model provides a tower crane formula high steep slope anchor is equipped with construction which characterized in that: the device comprises a hanging basket (1), a dovetail guide rail (2), a lifting lug (3), an anchor hole drilling machine (4), a fixing pin (5), an anchor hole recognition device (6), a lifting hook (7), a working steel wire rope (8), an electric hoist lifting machine (9), a lifting arm (10), an electric hoist limiting sensor (11), a tower crane fixing seat (12), a swing mechanism (13), a winch tractor (14), a winch (15) and a trailer (16); the hanging basket (1) is formed by welding profile steel, and a dovetail guide rail (2) arranged along the length direction of the hanging basket is arranged on a bottom plate; the anchor hole drilling machine (4) is arranged on the dovetail guide rail (2), and the anchor hole drilling machine (4) can move along the dovetail guide rail (2);

The hanging basket (1) comprises a left area (17), a middle area (18) and a right area (19), and three lifting lugs (3) are respectively arranged at the tops of the left area (17) and the right area (19); the left area (17), the middle area (18) and the right area (19) respectively comprise an upper beam (21), a middle beam (22) and a lower beam (23), wherein an oblique beam (24) is arranged between the upper beam (21) and the middle beam (22) to improve the stability, the lower beam (23) is provided with a mounting hole (231), a hydraulic source is fixedly mounted on the mounting hole (231) facing one side of the slope body, and a standby fixing rope is mounted on the mounting hole (231) far away from one side of the slope body; sliding rails are arranged on the middle beam (22) and the lower beam (23) facing one side of the slope body in the left area (17) and the right area (19) and used for mounting concave plates (56), the upper ends of the concave plates (56) are mounted on the middle beam, the lower ends of the concave plates (56) are mounted on the lower beam, and the concave plates (56) can slide left and right on the middle beam (22) and the lower beam (23); the inner sides of two side walls of the concave plate (56) are connected with a sliding plate (55) in a sliding mode, two convex blocks (57) are arranged on the sliding plate (55), holes are formed in the two convex blocks (57), a pivot shaft is arranged in each hole, a rotating block (54) is connected to the pivot shaft, a transfer plate (53) is fixedly connected to the rotating block (54), and the fixing pins (5) are arranged on the transfer plate (53); the tail end of the fixing pin (5) is provided with a tip (51), a shoulder (52) is arranged between the tip (51) and the fixing pin main body for clamping, the fixing pin main body is divided into four stepped sections, and the fixing pin main body is of a telescopic structure; the anchor hole recognition device (6) is arranged at the upper left corner of the adapter plate (53); the fixing pin (5) can be matched with an anchor hole which is drilled in advance, so that the hanging basket (1) is kept stable when the anchor hole drilling machine (4) works; hydraulic holes (58) are formed in the upper portion of the section, farthest from the tip, of the four stepped sections, hydraulic holes are also formed in the shoulder (52), and all the hydraulic holes are normally closed holes;

One end of the working steel wire rope (8) is connected with the electric hoist hoister (9), the other end of the working steel wire rope is connected with the lifting hook (7), the lifting hook (7) is continuously connected with the lifting lug (3) through the steel wire rope, and the working steel wire rope (8) is used for bearing the weight of the hanging basket; the electric hoist hoister (9) is arranged on a track below the suspension arm (10), and the electric hoist hoister (9) can move along the track; the electric hoist limiting sensor (11) is arranged at the tail end of the track; the suspension arm (10) is arranged above the slewing mechanism (13); the swing mechanism (13) is arranged on the tower crane fixing seat (12), and the rotation of the suspension arm (10) can be realized through the swing mechanism (13); the winch tractor (14) and the trailer (16) are positioned on the ground of the slope bottom; the winches (15) are divided into two groups, one group is positioned on the winch tractor (14), the other group is positioned on the trailer (16), each group of winches (15) is respectively connected with one side of the hanging basket (1), and the rotation of the swing mechanism (13) can be controlled through the retraction and release of the rope, so that the position of the hanging basket (1) is changed; the winch tractor (14) may tow a trailer (16).

2. The construction equipment for anchoring the tower crane type high and steep slope as claimed in claim 2, wherein: the number of the fixing pins (5) is two, the fixing pin main body is telescopic through an internal hydraulic structure, and two sections of the four stepped sections close to the tip (51) can be telescopic.

3. The construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: the anchor hole recognition device (6) is a camera.

4. the construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: the slewing mechanism (13) is driven by a motor.

5. The construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: the lifting lug (3) is U-shaped.

6. The construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: the dovetail guide rail (2) is provided with a dovetail groove on the guide rail.

7. The construction equipment for anchoring the tower crane type high and steep slope as claimed in claim 6, wherein: be equipped with the connecting plate on forked tail guide rail (2), be equipped with the forked tail arch on the connecting plate, the forked tail arch with forked tail recess cooperatees.

8. The construction equipment for anchoring the tower crane type high and steep slope as claimed in claim 7, wherein: the anchor hole drilling machine (4) is fixed on the connecting plate.

9. The construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: when the fixing pin (5) needs to be stretched, the hydraulic hole is connected with the hydraulic source.

10. The construction equipment for anchoring the tower crane type high and steep slope according to claim 1, wherein: the other end of the standby fixing rope can be in telescopic connection with a slope body or a fixing device at the bottom of the slope.

Technical Field

The invention relates to a side slope anchoring device, in particular to a construction device for anchoring and drilling a high and steep side slope.

Background

In recent years, a large number of slopes are built along with rapid development of construction of traffic and water conservancy and the like in China. Because the slope management is not considered, the occurrence frequency of the slope disaster is in a year-by-year rising state, and therefore the technical problem of how to well perform the slope management is generated. An important way of side slope reinforcement in side slope management is side slope anchoring. The existing anchoring construction mostly adopts a method of erecting a scaffold platform: the drilling machine is fixed on the scaffold platform to drill holes, and after an anchor hole is drilled by the drilling machine, the drilling machine needs to be disassembled manually and transported to the next construction position to be fixed. The construction method has the disadvantages that a scaffold needs to be erected in advance, and the erection of the scaffold is high in cost, time-consuming and labor-consuming; the anchor hole drilling machine is manually disassembled and assembled, so that the construction efficiency is low; the danger degree of erecting a scaffold facing a high and steep slope is high. The market lacks a construction equipment suitable for anchoring a high and steep side slope. How to carry out rock-soil anchoring construction on a high and steep slope efficiently, quickly and safely becomes the main research content of the people.

Patent document CN200310105657.6 discloses a high slope rock and soil anchoring construction method and device, and its main technical scheme is: a high slope rock-soil anchoring construction method presets six (or four) anchoring points up, down, left and right according to anchoring construction range, two ends of a thicker steel wire rope are firmly fixed on two anchoring points at high position, a drill floor with anchoring drilling machine and telescopic steering caster wheel is hung on the thicker steel wire rope through pulley block on the drill floor and hanging pulley connected with the drill floor, four steel wire ropes of four traverse winches fixed on ground are respectively passed through anchor point steering pulley at middle (or high) and low anchoring points and traverse steering pulley on the drill floor and then fixed on four anchoring points at middle (or high) and low positions, the drill floor is hung under the thicker steel wire rope by lifting winch fixed on ground through pulley block and hanging pulley to move vertically, four steel wire ropes of the traverse winches are used to move transversely, each steel wire rope is simultaneously tightened to make the drill floor cling to the slope, and simultaneously supporting the telescopic supporting legs of all the telescopic steering castors to tightly press the drill floor at the drilling construction position. The invention utilizes the cable and the telescopic support legs to change the position of the drill floor, the cable needs to be continuously tensioned and contracted, the length of each section of the cable needs to be controlled, the operation is complicated, the operation is difficult, the movement of the position of the drill floor is driven by a winch, the maneuverability is poor, and the working efficiency is low.

Patent document CN201810257468.7 discloses an adjustable jumbolter for high slope anchoring, which has the main technical scheme that: an adjustable anchor rod drilling machine for high slope anchoring comprises a walking crawler, an inclination angle sensor, a vision sensor, an adjusting oil cylinder, a sliding guide rail, a lifting lug, an operation platform, a movable arm oil cylinder, a drill arm oil cylinder, a drill bit sleeve, a drilling machine guide rail, an anchor rod drilling machine, a winch and a steel wire rope. The front and the back of the inner side of the walking track are both provided with hinged holes, the bottom of the hinged hole at the front end is provided with a lifting lug, the operating platform can move back and forth along the sliding guide rail, the platform is provided with an inclination angle sensor, the surface of the drill boom is provided with a drill guide rail and a jumbolter, the jumbolter can move along the drill guide rail, and the tail of the jumbolter is provided with a vision sensor.

Disclosure of Invention

Aiming at the problems of difficult construction, high cost, low efficiency, poor environment adaptability and high danger in the existing slope anchoring construction technology, the invention provides the anchor hole construction equipment for anchoring the high and steep slope, which has reliable working principle, low cost, high construction efficiency and easy operation.

the technical scheme adopted by the invention for solving the technical problems is as follows: a tower crane type high and steep slope anchoring construction device comprises a hanging basket 1, a dovetail guide rail 2, a lifting lug 3, an anchor hole drilling machine 4, a fixing pin 5, an anchor hole recognition device 6, a lifting hook 7, a working steel wire rope 8, an electric hoist lifting machine 9, a hanging arm 10, an electric hoist limit sensor 11, a tower crane fixing seat 12, a swing mechanism 13, a winch tractor 14, a winch 15 and a trailer 16; the hanging basket 1 is formed by welding profile steel, and a dovetail guide rail 2 arranged along the length direction of the hanging basket is arranged on a bottom plate; the anchor hole drilling machine 4 is arranged on the dovetail guide rail 2, and the anchor hole drilling machine 4 can move along the dovetail guide rail 2;

The hanging basket 1 comprises a left area 17, a middle area 18 and a right area 19, and three lifting lugs 3 are respectively arranged at the tops of the left area 17 and the right area 19; the left area 17, the middle area 18 and the right area 19 respectively comprise an upper beam 21, a middle beam 22 and a lower beam 23, wherein an oblique beam 24 is arranged between the upper beam 21 and the middle beam 22 to improve the stability, the lower beam 23 is provided with a mounting hole 231, a hydraulic source is fixedly mounted on the mounting hole 231 on one side facing the slope body, and a spare fixing rope is mounted on the mounting hole 231 on one side far away from the slope body; sliding rails are arranged on the middle beam 22 and the lower beam 23 of one side, facing the slope body, of the left area 17 and the right area 19 and are used for mounting concave plates 56, the upper ends of the concave plates 56 are mounted on the middle beam, the lower ends of the concave plates 56 are mounted on the lower beam, and the concave plates 56 can slide left and right on the middle beam 22 and the lower beam 23; the inner sides of the two side walls of the concave plate 56 are slidably connected with a sliding plate 55, the sliding plate 55 is provided with two convex blocks 57, the two convex blocks 57 are provided with holes, pivots are arranged in the holes, the pivots are connected with rotating blocks 54, the rotating blocks 54 are fixedly connected with adapter plates 53, and the adapter plates 53 are provided with the fixing pins 5; the tail end of the fixing pin 5 is provided with an apex 51, a shoulder 52 is arranged between the apex 51 and the fixing pin main body for clamping, the fixing pin main body is divided into four stepped sections, and the fixing pin main body is of a telescopic structure; the anchor hole recognition device 6 is arranged at the upper left corner of the adapter plate 53; the fixing pin 5 can be matched with an anchor hole which is drilled in advance, so that the hanging basket 1 is kept stable when the anchor hole drilling machine 4 works; hydraulic holes 58 are formed in the upper portion of the section, farthest from the tip, of the four stepped sections, hydraulic holes are also formed in the shoulder 52, and all the hydraulic holes are normally closed holes;

One end of the working steel wire rope 8 is connected with the electric hoist hoister 9, the other end of the working steel wire rope is connected with the lifting hook 7, the lifting hook 7 is continuously connected with the lifting lug 3 through the steel wire rope, and the working steel wire rope 8 is used for bearing the weight of the hanging basket; the electric hoist 9 is arranged on a track below the suspension arm 10, and the electric hoist 9 can move along the track; the electric hoist limiting sensor 11 is arranged at the tail end of the track; the suspension arm 10 is arranged above the swing mechanism 13; the swing mechanism 13 is arranged on the tower crane fixing seat 12, and the rotation of the suspension arm 10 can be realized through the swing mechanism 13; the winch tractor 14 and the trailer 16 are positioned on the ground of the slope bottom; the winches 15 are divided into two groups, wherein one group is positioned on the winch tractor 14, the other group is positioned on the trailer 16, each group of winches 15 is respectively connected with one side of the hanging basket 1, and the rotation of the slewing mechanism 13 can be controlled through the retraction and release of the ropes, so that the position of the hanging basket 1 is changed; the winch tractor 14 may tow a trailer 16.

preferably, the number of the fixing pins 5 is two, the fixing pin body is telescopic through an internal hydraulic structure, and the four stepped sections adjacent to the tip 51 can be telescopic.

Preferably, the anchor hole identification device 6 is a camera.

Preferably, the swing mechanism is driven by a motor.

Preferably, the lifting lug is U-shaped.

Preferably, the dovetail guide rail 2 is provided with a dovetail groove on the guide rail.

preferably, be equipped with the connecting plate on the forked tail guide rail 2, be equipped with the forked tail arch on the connecting plate, the forked tail arch with the forked tail recess cooperatees.

Preferably, the anchor drilling machine 4 is fixed on the connecting plate.

Preferably, the hydraulic hole is connected to the hydraulic source when the fixing pin 5 needs to be extended or retracted.

Preferably, the other end of the standby fixing rope can be telescopically connected with a slope body or a fixing device at the bottom of the slope.

The invention has the advantages that:

1. Aiming at the position adjusting mode of the drill floor in the background document I, the improvement point is that the hanging basket can accurately reach any construction position by the rotation of the suspension arm and the electric hoist with reference to the working principle of the tower crane. The winch is used as a power source for steering the suspension arm, and the slewing mechanism does not provide power, so that the structure of the tower crane part is further simplified, and the reliability of equipment is improved; the ground adopts hoist tractor and trailer as the mounting platform of hoist engine, has very strong mobility and flexibility.

2. Aiming at the fixing mode of the hanging basket in the second background document, the improved point is that the basket is provided with a fixing pin, the hanging basket is kept stable when the drilling machine works, a dovetail guide rail is arranged at the bottom plate of the hanging basket, the anchor hole drilling machine can move on the guide rail, the function of positioning multiple holes at one time can be realized, and the drilling efficiency is greatly improved.

3, 'three-point two-way fixation';

Aiming at the fixing mode in the first and second background documents, the situation that no matter the fixing pin or the pulley is used alone, the stability cannot be ensured due to the difference of construction environments in practical use is caused, at the moment, a combined mode of the fixing pin and the standby fixing rope is used, the fixing pin provides foundation fixing and supporting, the standby fixing rope is arranged on the mounting hole on one side far away from the slope body, the other end of the standby fixing rope is fixed at the bottom of the slope or the slope body, horizontal component force is provided to apply pressure to the hanging basket, and the hanging basket is better fixed on the slope body.

"multi-segment telescopic maximum extension distance";

In actual use, due to the difference of construction environments, the extension distance of the fixing pin is insufficient and cannot be tightly combined with the positioning hole.

5, three-dimensional movement and rotation and two-point adjustment;

The invention has high flexibility, the fixed pins have the function of three-dimensional movement and rotation, can move and rotate in three positive and negative directions of XYZ, and respectively move left and right and up and down along the beam as well as stretch and retract and rotate the adapter plate, and meanwhile, the number of the fixed pins is two, so that two-point balance fixation and adjustable fixation of different positioning hole distances are ensured.

Drawings

Fig. 1 is an overall working schematic diagram of the present invention.

Fig. 2 is an overall working side view of the present invention.

Figure 3 is an oblique view of a portion of the basket of the present invention.

fig. 4 is a schematic diagram of the operation of the fixing pin of the present invention.

Fig. 5 is an enlarged view of a portion of the fixing pin.

In the figure: 1-hanging basket, 2-dovetail guide rail, 3-lifting lug, 4-anchor hole drilling machine, 5-fixed pin, 6-anchor hole identification device, 7-lifting hook, 8-working steel wire rope, 9-electric hoist hoister, 10-lifting arm, 11-electric hoist limit sensor, 12-tower crane fixing seat, 13-slewing mechanism, 14-winch tractor, 15-winch, 16-trailer, 17-left area, 18-middle area, 19-right area, 21-upper beam, 22-middle beam, 23-lower beam, 231-mounting hole, 24-oblique beam, 31-middle lifting lug, 51-top tip, 52-shoulder, 53-adapter plate, 54-turning block, 55-sliding plate, 56-concave plate, 57-lugs, 58-hydrodynamic holes.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a construction equipment for anchoring a tower-hung high and steep slope comprises a hanging basket 1, a dovetail guide rail 2, a lifting lug 3, an anchor hole drilling machine 4, a fixing pin 5, an anchor hole recognition device 6, a lifting hook 7, a working steel wire rope 8, an electric hoist lifting machine 9, a lifting arm 10, an electric hoist limit sensor 11, a tower crane fixing seat 12, a swing mechanism 13, a winch tractor 14, a winch 15 and a trailer 16; the hanging basket 1 is formed by welding profile steel, and a dovetail guide rail 2 arranged along the length direction of the hanging basket is arranged on a bottom plate; the anchor hole drilling machine 4 is arranged on the dovetail guide rail 2, and the anchor hole drilling machine 4 can move along the dovetail guide rail 2;

The hanging basket 1 comprises a left area 17, a middle area 18 and a right area 19, and three lifting lugs 3 are respectively arranged at the tops of the left area 17 and the right area 19; the left area 17, the middle area 18 and the right area 19 respectively comprise an upper beam 21, a middle beam 22 and a lower beam 23, wherein an oblique beam 24 is arranged between the upper beam 21 and the middle beam 22 to improve the stability, the lower beam 23 is provided with a mounting hole 231, a hydraulic source is fixedly mounted on the mounting hole 231 on one side facing the slope body, and a spare fixing rope is mounted on the mounting hole 231 on one side far away from the slope body; sliding rails are arranged on the middle beam 22 and the lower beam 23 of one side, facing the slope body, of the left area 17 and the right area 19 and are used for mounting concave plates 56, the upper ends of the concave plates 56 are mounted on the middle beam, the lower ends of the concave plates 56 are mounted on the lower beam, and the concave plates 56 can slide left and right on the middle beam 22 and the lower beam 23; the inner sides of the two side walls of the concave plate 56 are slidably connected with a sliding plate 55, the sliding plate 55 is provided with two convex blocks 57, the two convex blocks 57 are provided with holes, pivots are arranged in the holes, the pivots are connected with rotating blocks 54, the rotating blocks 54 are fixedly connected with adapter plates 53, and the adapter plates 53 are provided with the fixing pins 5; the tail end of the fixing pin 5 is provided with an apex 51, a shoulder 52 is arranged between the apex 51 and the fixing pin main body for clamping, the fixing pin main body is divided into four stepped sections, and the fixing pin main body is of a telescopic structure; the anchor hole recognition device 6 is arranged at the upper left corner of the adapter plate 53; the fixing pin 5 can be matched with an anchor hole which is drilled in advance, so that the hanging basket 1 is kept stable when the anchor hole drilling machine 4 works; hydraulic holes 58 are formed in the upper portion of the section, farthest from the tip, of the four stepped sections, hydraulic holes are also formed in the shoulder 52, and all the hydraulic holes are normally closed holes;

One end of the working steel wire rope 8 is connected with the electric hoist hoister 9, the other end of the working steel wire rope is connected with the lifting hook 7, the lifting hook 7 is continuously connected with the lifting lug 3 through the steel wire rope, and the working steel wire rope 8 is used for bearing the weight of the hanging basket; the electric hoist 9 is arranged on a track below the suspension arm 10, and the electric hoist 9 can move along the track; the electric hoist limiting sensor 11 is arranged at the tail end of the track; the suspension arm 10 is arranged above the swing mechanism 13; the swing mechanism 13 is arranged on the tower crane fixing seat 12, and the rotation of the suspension arm 10 can be realized through the swing mechanism 13; the winch tractor 14 and the trailer 16 are positioned on the ground of the slope bottom; the winches 15 are divided into two groups, wherein one group is positioned on the winch tractor 14, the other group is positioned on the trailer 16, each group of winches 15 is respectively connected with one side of the hanging basket 1, and the rotation of the slewing mechanism 13 can be controlled through the retraction and release of the ropes, so that the position of the hanging basket 1 is changed; the winch tractor 14 may tow a trailer 16.

The number of the fixing pins 5 is two, the fixing pin body is telescopic through an internal hydraulic structure, and two sections of the stepped four sections close to the tip 51 can be telescopic. The anchor eye recognition device 6 is a camera. The slewing mechanism is driven by a motor. The lifting lug is U-shaped. The dovetail guide rail 2 is provided with a dovetail groove on the guide rail. Be equipped with the connecting plate on the forked tail guide rail 2, be equipped with the forked tail arch on the connecting plate, the forked tail arch with the forked tail recess cooperatees. The anchor hole drilling machine 4 is fixed on the connecting plate. When the fixing pin 5 needs to be stretched, the hydraulic hole is connected with the hydraulic source. The other end of the standby fixing rope can be in telescopic connection with a slope body or a fixing device at the bottom of the slope.

The construction method comprises the steps of firstly arranging a tower crane fixing seat 12 at the top of a slope, then installing the rest parts of the tower crane part, drilling a row of initial positioning holes at the toe of the slope during construction, then controlling the hanging basket 1 to move to a position to be constructed through an electric hoist 9 and a suspension arm 10, automatically identifying the adjacent positioning holes by an anchor hole identification device 6, enabling a fixing pin 5 to move to a position right opposite to the positioning holes, extending out the fixing pin 5 and matching with the initial positioning holes, so that the hanging basket 1 is fixed, then starting an anchor hole drilling machine 4 to drill holes above the positioning holes, and gradually lifting the construction height to the top of the slope by using the anchor holes drilled in the previous step as positioning holes at higher positions after the drilling is finished.

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