Construction method and equipment for cast-in-place pile pre-wall protection

Abstract

The invention relates to the technical field of building construction, and discloses a method for constructing a pre-protection wall of a bored pile and its construction equipment, including: when a drilling rig sinks, a water injection pump supplies water to a reverse water spray blade to dilute the soil layer, and a forward soil cutting blade and a reverse water spray blade cross-cut the soil, so that the drilling rig reaches the designed depth; after reaching the depth, the water injection pump is turned off, a high-pressure grouting pump and an intelligent grouting machine are started, and a telescopic device pushes out a telescopic grouting blade with a grouting nozzle to the outside of a grouting barrel; the intelligent grouting machine prepares cement slurry, which is transported to the grouting nozzle through a high-pressure grouting pump and a grouting pipe, and sprayed into the soil layer outside the pile hole; during the lifting process of the drilling rig, the telescopic grouting blade, the grouting plate and the grouting barrel stir and squeeze the soil layer, so that the cement slurry is consolidated outside the pile to form a protective wall. The invention forms a solid protective wall by sinking the drilling rig forward and reverse soil cutting and water spraying and automatically lifting with grouting, which is particularly suitable for complex geological conditions, effectively prevents hole collapse, broken piles and excessive sediment thickness, significantly improves the bearing capacity of the bored pile and protects the pile body.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a cast-in-place pile pre-wall construction method and construction equipment thereof. Background Art

[0002] With the continuous advancement of large-scale infrastructure construction such as ports, docks, airports, water conservancy facilities, bridges and culverts, and railways, these projects are usually located in areas with complex geological conditions such as offshore coasts and riverside beaches. Most of the sites are marine plains, formed by landfills and silt, and belong to soft soil foundations. There are about 20-30 meters deep unfavorable soil layers such as riprap, silt and quicksand underground. Under such geological conditions, cast-in-place piles are widely selected as pile foundation solutions due to their high bearing capacity and adaptability, which are used to safely transfer the load of the upper structure to the lower bearing layer.

[0003] However, when constructing bored piles in soft soil layers, traditional mud wall protection technology faces many challenges. Although bored piles have a long history of application and high bearing capacity, it is difficult to control the mud concentration when encountering soft soil, silt or highly compressible soil layers, which can easily lead to problems such as broken piles, necking, and excessive sediment at the pile end, seriously affecting the quality of the project. For example, although patent No. ZL201010257667.1 claims to be applicable to all excavation and other pile foundation construction that requires wall protection, it is especially suitable for the design and construction of large-scale building pile foundations with complex geology, large diameters, and high bearing capacity, and has obvious advantages in construction on soft soil foundations, coastal areas, and tidal flats. However, in actual applications, its scope of application is still limited, especially under geological conditions such as soft soil, silt and quicksand, the effect of traditional mud wall protection technology is not good and the quality of piles cannot be ensured.

[0004] In summary, the traditional slurry wall protection technology commonly used in the current bored pile construction has poor application effect in soft and poor soil layers, cannot ensure the quality of pile formation, and can no longer fully meet the development needs of national infrastructure construction. Especially in high-level engineering projects, a new technical solution that can effectively overcome the above problems is urgently needed to improve construction efficiency and engineering quality, ensure engineering progress, and reduce additional costs and economic losses caused by quality problems. The existing technology not only has defects such as limited scope of application, unreasonable slurry retaining structure design, pipeline system design problems, improper clay treatment, and frequent construction quality problems, but also performs poorly under geological conditions such as soft soil, silt, and quicksand, making it difficult to achieve efficient wall protection.

[0005] Therefore, it is particularly urgent to develop a method and equipment suitable for all types of cast-in-place pile wall construction. This new method should support mechanized construction, have the advantages of short construction period, low cost, environmental protection and low mud consumption, and can significantly improve construction quality and safety, solve the common problems of hole collapse, broken piles and unqualified inspection in traditional mud wall construction, so as to better serve the needs of national infrastructure construction. Summary of the invention

[0006] In view of the above-mentioned technical deficiencies, the technical problem to be solved by the present invention is to provide a bored pile pre-wall construction method and construction equipment thereof, aiming to optimize the technical solution of mud wall protection in bored pile construction and solve the technical problem of unqualified inspection caused by pile collapse and too thick sediment at the end of broken piles in traditional mud wall protection projects.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a cast-in-place pile pre-wall construction method, comprising: When the drilling rig sinks, the water injection pump is turned on to supply water to the water nozzle of the reverse water spray blade through the water supply pipe to dilute the soil layer. The forward-rotating soil cutting blade and the reverse water spray blade cross-cut the soil to make the drilling rig sink smoothly to the designed pile depth. After reaching the designed pile depth, turn off the water injection pump, start the high-pressure grouting pump and the intelligent grouting machine, and the telescopic device pushes the telescopic grouting blade with a grouting nozzle connected to the lower end of the outer drill rod out of the grout retaining tube; The intelligent grouting machine prepares cement slurry or curing agent, and transports the cement slurry or curing agent to the grouting nozzle through a high-pressure grouting pump and a grouting pipe, and then sprays the grouting slurry or curing agent into the soil layer outside the pile hole at high pressure from the grouting nozzle; As the drilling rig is evenly lifted to the top of the pile, the telescopic shotcrete blades, slurry retaining plates and slurry retaining barrels stir and squeeze the soil layer, so that the cement slurry or curing agent is consolidated outside the pile to form a protective wall.

[0008] Further, it includes: determining the center points or corner points of the plurality of pile holes and arranging them in a predetermined circular or square shape; Each pile hole is drilled, water is sprayed to dilute the soil layer, and grouting is used to consolidate the wall. The retaining wall portions between adjacent pile holes overlap each other to form a continuous and complete retaining wall structure to enhance the overall stability and supporting force of the retaining wall.

[0009] Construction equipment for cast-in-place pile pre-wall protection, including: high-pressure grouting pump, grouting pipe, water injection pump, grout retaining cylinder, forward-rotating soil cutting blade, grouting nozzle, water spraying nozzle, reverse-rotating water spraying blade, telescopic grouting blade, telescope, telescopic blade base, outer drill rod, inner drill rod and water delivery pipe; The outer drill rod is connected to the telescopic blade base, a slurry retaining tube is provided on the outside of the telescopic blade base, a forward-rotating soil cutting blade is provided on the inside of the slurry retaining tube, and a telescopic device is installed in the telescopic blade base to control the telescopic spraying blade; the telescopic spraying blade is provided with a spraying nozzle, which is connected to the high-pressure grouting pump through a slurry delivery pipe; The inner drill rod is connected with the reverse water spray blade. The lower end of the reverse water spray blade is provided with a water spray nozzle which is connected with the water injection pump through a water supply pipe.

[0010] Furthermore, the forward-rotating soil-cutting blade has an inclined surface, and when the drilling rig rotates forward, the inclined surface cuts the soil downward and sinks it, and when the drilling rig rotates reversely, the inclined surface presses the soil upward and lifts it.

[0011] Furthermore, it also includes a vertical guide head to ensure the verticality of the drilling rig during the construction process and prevent deviation.

[0012] Furthermore, a slurry retaining plate is provided on the slurry retaining tube to further prevent cement slurry or curing agent from flowing into the pile hole, thereby ensuring the quality of the wall protection.

[0013] Furthermore, the telescopic spraying blade is controlled by a telescopic device. When the drilling is completed and switched to the spraying mode, the telescopic spraying blade is pushed out of the slurry retaining tube to ensure the effective spraying operation. The spray nozzle on the telescopic spray blade is connected to the high-pressure grouting pump through a slurry delivery pipe and a slurry-water converter to achieve high-pressure spraying of cement slurry or curing agent; The water spray nozzles on the reverse water spray blades are connected to the water injection pump through the water supply pipe and the slurry water converter to ensure that the water spray evenly dilutes the soil layer; At the same time, a three-way valve is set between the water supply pipe and the slurry supply pipe to switch the water spraying and slurry spraying modes and ensure that the two liquids do not interfere with each other.

[0014] Furthermore, it also includes: using a rotary drilling barrel of a drilling rig or rotary drilling machine as a slurry retaining barrel; Furthermore, it also includes: using a drilling rig or spiral drilling rig reaming drill bit and a screw rod as a telescopic device and a telescopic spraying blade.

[0015] The beneficial effects of the present invention are as follows: the functions of the various operating systems of the machine are clear, the drilling rig can cut soil and spray water to sink when rotating forward and reversely, and automatically control the spraying during the lifting process to form a solid protective wall, which is particularly suitable for complex geological conditions and can effectively prevent problems such as hole collapse, broken piles and excessive sediment thickness, significantly improve the bearing capacity of the bored piles and protect the pile body from sewage erosion. Compared with traditional mud wall protection, the present invention solves common problems such as hole collapse, broken piles and inspection failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of the cast-in-place pile pre-wall construction equipment provided in an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the drilling rig starting forward and reverse water jetting to cut soil and sink.

[0019] Figure 3 The drilling rig starts to rotate and spray the grouting wall to lift the plan view.

[0020] Figure 4 Schematic diagram of semi-overlapping plan.

[0021] Explanation of the accompanying reference numerals: 1. Intelligent slurry mixing machine; 2. High-pressure grouting pump; 3. Water injection pump; 4. Three-way valve; 5. Slurry delivery pipe; 6. Slurry retaining plate; 7. Slurry retaining cylinder; 8. Grouting nozzle; 9. Water nozzle; 10. Reverse water spraying blade; 11. Telescopic grouting blade; 12. Forward soil cutting blade; 13. Telescopic device; 14. Telescopic blade base; 15. Slurry-water converter; 16. External drill rod; 17. Internal drill rod; 18. Vertical guide head; 19. Water delivery pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1As shown, this embodiment provides cast-in-place pile pre-wall construction equipment, including: a high-pressure grouting pump 2, a slurry delivery pipe 5, a water injection pump 3, a slurry retaining tube 7, a forward-rotating soil-cutting blade 12, a grouting nozzle 8, a water nozzle 9, a reverse water-spraying blade 10, a telescopic grouting blade 11, a telescope 13, a telescopic blade base 14, an outer drill rod 16, an inner drill rod 17 and a water delivery pipe 19; wherein, the outer drill rod 16 is connected to the telescopic blade base 14, a slurry retaining tube 7 is provided on the outer side of the telescopic blade base 14, a forward-rotating soil-cutting blade 12 is provided on the inner side of the slurry retaining tube 7, and a telescope 13 installed in the telescopic blade base 14 controls the telescopic grouting blade 11; the telescopic spraying blade 11 is provided with a slurry nozzle 8, and is connected to the high-pressure grouting pump 2 through the slurry delivery pipe 5; the inner drill rod 17 is connected to the reverse water-spraying blade 10, and a water nozzle 9 is provided at the lower end of the reverse water-spraying blade 10, which is connected to the water injection pump 3 through the water delivery pipe 19.

[0025] Specifically, the forward-rotating soil-cutting blade 12 has an inclined surface. When the drilling rig rotates forward, the inclined surface cuts the soil downward and sinks, and when the drilling rig rotates reversely, the inclined surface presses the soil upward and lifts it. It also includes a vertical guide head 18 to ensure the verticality of the drilling rig during construction and prevent deviation. The slurry retaining tube 7 is also provided with a slurry retaining plate 6. When the drilling rig reverses and sprays to lift the retaining wall, the slurry retaining tube 7 and the slurry retaining plate 6 block the cement slurry or curing agent from flowing into the pile hole. The telescopic spraying blade 11 is controlled by a telescopic device 13. When the drilling is completed and switched to the spraying mode, the telescopic spraying blade 11 is retracted. 1 is pushed out of the slurry retaining tube 7 to ensure the effective implementation of the grouting operation; wherein, the grouting nozzle 8 on the telescopic grouting blade 11 is connected to the high-pressure grouting pump 2 through the slurry delivery pipe 5 and the slurry-water converter 15 to realize high-pressure spraying of cement slurry or curing agent; the water nozzle 9 on the reverse water spraying blade 10 is connected to the water injection pump 3 through the water delivery pipe 19 and the slurry-water converter 15 to ensure that the soil layer is evenly diluted by water spraying; at the same time, the three-way valve 4 is arranged between the water delivery pipe 19 and the slurry delivery pipe 5 to switch the water spraying and grouting modes and ensure that the two liquids do not interfere with each other.

[0026] like Figure 2~Figure 4 As shown, this embodiment also provides a cast-in-place pile pre-wall construction method, comprising the following steps: like Figure 2 As shown, when the drilling rig sinks, the drilling rig starts the forward and reverse modes, starts the water injection pump 3, and supplies water to the water nozzle 9 of the reverse water spraying blade 10 through the water supply pipe 19, the three-way valve 4, and the slurry water converter 15, and the water is sprayed to dilute the soil layer. The forward soil cutting blade 12 and the reverse water spraying blade 10 cross-cut the soil to make the drilling rig sink smoothly to the designed pile depth. It should be noted that: when the drilling rig sinks by cutting the soil, the forward soil cutting blade 12 and the reverse water spraying blade 10 cross-cut the soil, and the clay stuck on the blade slurry plate 6 will be repeatedly cut by the blades in the forward and reverse directions and cannot be formed into a mud ball.

[0027] like Figure 3As shown, after the drilling rig drills to the designed pile depth, the drilling rig starts the reverse rotation mode, turns off the water injection pump 3, starts the high-pressure grouting pump 2 and the intelligent grouting machine 1, and the telescopic device 13 pushes the telescopic grouting blade 11 with the grouting nozzle 8 connected to the lower end of the outer drill rod 16 out of the outside of the grout retaining tube 7; the intelligent grouting machine 1 prepares cement slurry or curing agent, and transports the cement slurry or curing agent to the grouting nozzle 8 through the high-pressure grouting pump 2 and the grouting pipe 5, and sprays it into the soil layer outside the pile hole from the grouting nozzle 8 at high pressure; during the process of the drilling rig being evenly lifted to the top surface of the pile, the telescopic grouting blade 11, the grouting plate 6 and the grouting tube 7 stir and squeeze the soil layer, so that the cement slurry or curing agent is consolidated outside the pile to form a protective wall.

[0028] Preferably, Figure 4 As shown, when constructing super-large diameter bored piles, semi-overlapping drilling is used: the center points or corner points of multiple pile holes are determined and arranged in a predetermined circular or square shape; each pile hole is drilled, water is sprayed to dilute the soil layer, and grouting is used to consolidate the retaining wall; the retaining wall portions between adjacent pile holes overlap each other to form a continuous and complete retaining wall structure to enhance the overall stability and support of the retaining wall.

[0029] Example 2

[0030] Based on Example 1, this embodiment uses the rotary drilling barrel of a drilling rig or rotary drilling machine as the slurry retaining barrel 7. The specific operation is as follows: The rotary drilling barrel has a closed bottom and side walls, which can effectively prevent the cement slurry curing agent from flowing into the pile hole; when the drilling rig sinks, the rotary drilling barrel rotates with the drill rod and cuts into the soil layer, and at the same time supplies water to the reverse water spray blades 10 through the water injection pump 3 to dilute the soil layer; after reaching the designed pile depth, the water injection pump 3 is turned off, and the high-pressure grouting pump 2 and the intelligent grouting machine 1 are started; the intelligent grouting machine 1 prepares cement slurry and transports it to the grouting nozzle 8 through the high-pressure grouting pump 2 and the grouting pipe 5, and is sprayed from the grouting nozzle 8 into the soil layer outside the pile hole; during the lifting process of the drilling rig, the rotary drilling barrel and the slurry retaining plate 6 work together to stir and squeeze the soil layer, so that the cement slurry is consolidated outside the pile to form a protective wall.

[0031] The expansion plan of this embodiment utilizes the rotary drilling barrel of an existing drilling rig or rotary drilling rig, and does not require the manufacture of additional special equipment, thereby reducing construction costs and improving construction efficiency; at the same time, the plan is suitable for various complex geological conditions, significantly improving the convenience and scope of application of construction.

[0032] Example 3

[0033] Based on Example 1, this example uses the reaming drill bit and screw rod of the spiral drill as the telescopic device 13 and the telescopic spraying blade 11. The specific operation is as follows: The reaming drill bit is provided with adjustable blades, and the extension length of the blades is controlled by a screw rod to adapt to the requirements of pile holes of different diameters; construction process: when the drilling rig sinks, the forward-rotating soil-cutting blades 12 and the reverse-rotating water-spraying blades 10 cross-cut the soil, so that the drilling rig can smoothly reach the designed pile depth; after reaching the designed pile depth, the water injection pump 3 is turned off, and the high-pressure grouting pump 2 and the intelligent grouting machine 1 are started; the grouting nozzle 8 of the reaming drill bit is pushed out to the required position by the screw rod, and the intelligent grouting machine 1 prepares cement slurry and transports it to the grouting nozzle 8 through the high-pressure grouting pump 2 and the grouting pipe 5, and is sprayed from the grouting nozzle 8 into the soil layer outside the pile hole; during the lifting process of the drilling rig, the reaming drill bit and the slurry retaining plate 6 work together to stir and squeeze the soil layer, so that the cement slurry is consolidated outside the pile to form a protective wall.

[0034] The expansion scheme of this embodiment utilizes the existing drilling rig or spiral drilling rig reaming drill bit and screw rod, which not only simplifies the equipment configuration, but also improves the construction flexibility and adaptability; this scheme is particularly suitable for projects that require flexible adjustment of the pile hole diameter, further demonstrating the wide applicability and convenience of the present invention.

[0035] Example 4

[0036] This embodiment is the fourth embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a verification test of a cast-in-place pile pre-wall construction method and its construction equipment, and verifies and explains the technical effects used in this method.

[0037] The present invention is applied to the outpatient building of Lianyungang Oriental Hospital, which is 18 stories high. The bored piles are designed to have diameters of 1.5 meters and 1.8 meters, a pile length of 20 to 35 meters, and a single pile bearing capacity limit of 18,000 to 22,000 kN. During construction, a bored pile pre-protection wall construction method is adopted to consolidate the outer side of the pile to form a protective wall about 15 to 30 cm thick.

[0038] This section is a mountainous marine plain with a silt thickness of 3 to 4 meters, uneven stratification of fine sand of about 4 meters, and a large height difference of the rock surface. This construction method is used to protect the wall. There is no crooked or collapsed hole when digging holes for soil. The silt fine layer is solidified into a hole, and the hole wall is flat and smooth. After low-strain static load inspection, it meets the design requirements.

[0039] The present invention is applicable to all types of cast-in-place pile wall construction, and performs particularly well in geological conditions such as soft soil, silt, and quicksand. The method supports full mechanized operation, significantly shortens the construction period, reduces construction costs, and is highly environmentally friendly because it requires very little mud, reducing the impact on the environment; in addition, mechanized construction also improves work efficiency and safety, ensuring the stability and reliability of construction quality.

[0040] The construction method and construction equipment of the cast-in-place pile pre-wall of the present invention have strong pertinence and professional effectiveness for solving many quality problems of cast-in-place piles produced by traditional mud wall protection under adverse geological conditions, and have social value for promotion and application.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cast-in-place pile pre-wall construction method, characterized in that: include: When the drilling rig sinks, the water injection pump is turned on to supply water to the water nozzle of the reverse water spray blade through the water supply pipe to dilute the soil layer. The forward-rotating soil cutting blade and the reverse water spray blade cross-cut the soil to make the drilling rig sink smoothly to the designed pile depth. After reaching the designed pile depth, the water injection pump is turned off, the high-pressure grouting pump and the intelligent grouting machine are started, and the telescopic device pushes the telescopic grouting blade with a grouting nozzle connected to the lower end of the outer drill rod out of the grout retaining tube; The intelligent grouting machine prepares cement slurry or curing agent, and transports the cement slurry or curing agent to the grouting nozzle through a high-pressure grouting pump and a grouting pipe, and then sprays the grouting slurry or curing agent into the soil layer outside the pile hole at high pressure from the grouting nozzle; As the drilling rig is evenly lifted to the top of the pile, the telescopic shotcrete blades, slurry retaining plates and slurry retaining barrels stir and squeeze the soil layer, so that the cement slurry or curing agent is consolidated outside the pile to form a protective wall.

2. The method for constructing a cast-in-place pile pre-wall according to claim 1, characterized in that: include: Determine the center points or corner points of multiple pile holes and arrange them in a predetermined circle or square; Each pile hole is drilled, water is sprayed to dilute the soil layer, and grouting is used to consolidate the wall. The retaining wall portions between adjacent pile holes overlap each other to form a continuous and complete retaining wall structure to enhance the overall stability and supporting force of the retaining wall.

3. Construction equipment based on the cast-in-place pile pre-wall construction method according to any one of claims 1 to 2, characterized in that: include: High-pressure grouting pump, grouting pipe, water injection pump, grout retaining cylinder, forward-rotating soil cutting blade, grouting nozzle, water spraying nozzle, reverse-rotating water spraying blade, telescopic grouting blade, telescope, telescopic blade base, outer drill rod, inner drill rod and water delivery pipe; The outer drill rod is connected to the telescopic blade base, a slurry retaining tube is provided on the outside of the telescopic blade base, a forward-rotating soil cutting blade is provided on the inside of the slurry retaining tube, and a telescopic device is installed in the telescopic blade base to control the telescopic spraying blade; the telescopic spraying blade is provided with a spraying nozzle, which is connected to the high-pressure grouting pump through a slurry delivery pipe; The inner drill rod is connected with the reverse water spray blade. The lower end of the reverse water spray blade is provided with a water spray nozzle which is connected with the water injection pump through a water supply pipe.

4. The cast-in-place pile pre-wall construction equipment as claimed in claim 3, characterized in that: The forward-rotating soil-cutting blade has an inclined surface. When the drilling rig rotates forward, the inclined surface cuts the soil downward and sinks it, while when the drilling rig rotates reversely, the inclined surface presses the soil upward and lifts it.

5. The cast-in-place pile pre-wall construction equipment as claimed in claim 3, characterized in that: It also includes a vertical guide head to ensure the verticality of the drilling rig during construction and prevent deviation.

6. The cast-in-place pile pre-wall construction equipment according to claim 3, characterized in that: The slurry retaining tube is also provided with a slurry retaining plate, which is used to further prevent cement slurry or curing agent from flowing into the pile hole, thereby ensuring the quality of the wall protection.

7. The cast-in-place pile pre-wall construction equipment as claimed in claim 3, characterized in that: include: The telescopic shotcrete blade is controlled by a telescopic device. When the drilling is completed and the shotcrete mode is switched to, the telescopic shotcrete blade is pushed out of the slurry retaining tube to ensure the effective execution of the shotcrete operation. The spray nozzle on the telescopic spray blade is connected to the high-pressure grouting pump through a slurry delivery pipe and a slurry-water converter to achieve high-pressure spraying of cement slurry or curing agent; The water spray nozzles on the reverse water spray blades are connected to the water injection pump through the water supply pipe and the slurry water converter to ensure that the water spray evenly dilutes the soil layer; At the same time, a three-way valve is set between the water supply pipe and the slurry supply pipe to switch the water spraying and slurry spraying modes and ensure that the two liquids do not interfere with each other.

8. The cast-in-place pile pre-wall construction equipment as claimed in claim 3, characterized in that: Also includes: The rotary drilling barrel of a drilling rig or rotary drilling rig is used as a slurry retaining barrel.

9. The cast-in-place pile pre-wall construction equipment according to claim 3, characterized in that: Also includes: The drilling rig or spiral drilling rig reaming drill bit and screw rod are used as the telescopic device and telescopic spraying blade.

Images