CN114922627A - A vertical shaft construction device and construction method - Google Patents
A vertical shaft construction device and construction method Download PDFInfo
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- CN114922627A CN114922627A CN202210656058.6A CN202210656058A CN114922627A CN 114922627 A CN114922627 A CN 114922627A CN 202210656058 A CN202210656058 A CN 202210656058A CN 114922627 A CN114922627 A CN 114922627A
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- equipment
- vertical shaft
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
- E21D1/06—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws with shaft-boring cutters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/08—Sinking shafts while moving the lining downwards
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
本发明涉及一种立井施工装置及方法，装置包括机架、钻机、吊机、起重设备以及空压设备以及泥浆处理设备，机架包括平台、多根支腿，多根支腿支撑在平台底部，使平台底部架空并形成工作空间；钻机包括钻机主机、连接在钻机主机底部的钻具，钻机主机设置在平台上；钻具包括钻杆、连接在钻杆底端的导向器、一端连接在导向器底部的中心筒以及连接在中心筒另一端的刀盘；吊机连接在平台的底部，起重设备设置在工作空间内，空压设备、泥浆处理设备设置在平台上。本发明通过加高平台，留出设备及管片操作空间，保证施工操作的便利性、效率、安全性；刀盘全断面开挖，提高施工效率，钻具的移除，不与管片干涉；下沉管片同步支护，保证施工安全。
The invention relates to a vertical shaft construction device and method. The device includes a frame, a drilling rig, a crane, a hoisting device, an air compression device and a mud treatment device. The frame includes a platform and a plurality of outriggers, and the plurality of outriggers are supported on the platform. The bottom makes the bottom of the platform overhead and forms a working space; the drilling rig includes a drilling rig host, a drilling tool connected to the bottom of the drilling rig host, and the drilling rig host is arranged on the platform; the drilling tool includes a drill pipe, a guide connected at the bottom of the The center cylinder at the bottom of the guide and the cutter head connected to the other end of the center cylinder; the crane is connected to the bottom of the platform, the lifting equipment is set in the working space, and the air pressure equipment and mud treatment equipment are set on the platform. By raising the platform, the invention reserves the operation space for equipment and segment to ensure the convenience, efficiency and safety of construction operation; full-section excavation of the cutter head improves construction efficiency, and the removal of drilling tools does not interfere with segment ; Simultaneous support of sinking segments to ensure construction safety.
Description
Technical Field
The invention belongs to the technical field of vertical shaft construction, and particularly relates to a vertical shaft construction device and a vertical shaft construction method.
Background
At present, the drilling method construction of a shaft drilling machine adopts cutter head full-section excavation, gas lift reverse circulation slurry is used for deslagging, a slurry retaining wall is used for supporting in the tunneling process, prefabricated segment open caisson supporting is used after tunneling is completed, and grouting reinforcement needs to be carried out on the periphery of a shaft before construction for an area where geology is prone to collapse. The cutter head is excavated in a full section, so that the efficiency is high, and the gas lift reverse circulation slurry deslagging efficiency is high; however, the slurry wall protection is adopted in the construction process, and the shaft is supported only by the tension of the slurry, so that collapse easily occurs, particularly, the disturbance influence of the rotation of the cutter head exists, the ground grouting cost is high, the geology is polluted, even because the high-pressure grouting damages the surrounding soil, unforeseeable secondary disasters occur, and in addition, the diameter of the cutter head is fixed, so that the cutter head cannot be lifted out of a small rear lining.
The construction of the sinking type vertical shaft heading machine adopts the cutting head of the sinking type vertical shaft heading machine to excavate, pump suction reverse circulation is carried out to remove slag, and sinking segments are synchronously supported. The supporting effect of synchronous supporting of sinking segments is good, collapse danger is avoided, the digging range of the cutting head is limited, the construction efficiency is severely limited, the deslagging efficiency of pumping reverse circulation is lower than that of gas-lift reverse circulation mud deslagging, the requirement on the pump is very high, and the purchasing cost of the pump is high.
Therefore, in the prior art: the construction of the sinking type vertical shaft tunneling machine cannot realize full-face excavation, and the construction efficiency is low; the pumping reverse circulation deslagging efficiency is low, the requirement of the pump is high, and the pump is not suitable for the construction of a deep vertical shaft; the slurry retaining wall can not effectively ensure that a shaft does not collapse in construction, and the construction risk is high; traditional fixed blade disc can't realize the reducing, if there are supports such as steel cylinder, section of jurisdiction at the rear portion in the drilling process, leads to the drilling tool can't be carried out after the construction is accomplished.
Disclosure of Invention
An object of the present invention is to provide a vertical shaft construction device.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vertical shaft construction device comprising:
the support legs are supported at the bottom of the platform, so that the bottom of the platform is overhead and forms a working space;
the drilling machine comprises a drilling machine main machine and a drilling tool connected to the bottom of the drilling machine main machine, wherein the drilling machine main machine is arranged on the platform; the drilling tool comprises a drill rod, a guider connected to the bottom end of the drill rod, a central cylinder with one end connected to the bottom of the guider and a cutter head connected to the other end of the central cylinder;
the crane is connected to the bottom of the platform and can move relative to the platform;
the hoisting equipment is arranged in the working space;
the device comprises air compression equipment and slurry treatment equipment, wherein the air compression equipment and the slurry treatment equipment are arranged on the platform.
Preferably, the guider comprises a guider fixing frame, a plurality of link mechanisms connected to the periphery of the fixing frame and a supporting shoe connected to the link mechanisms, a supporting surface of the supporting shoe is always kept in the vertical direction, and the link mechanisms drive the supporting shoe to extend out or retract in the radial direction of the guider fixing frame.
Further preferably, a wear plate is arranged on the supporting surface of the supporting shoe, and the wear plate is provided with a raised wear strip.
Above-mentioned technical scheme is preferred, the blade disc include the blade disc mount, connect blade disc mount a plurality of link mechanism all around, connect link mechanism on reaming arm and hobbing cutter, link mechanism drive reaming arm radially stretch out or retract at the blade disc mount, blade disc mount bottom be provided with a plurality of hobbing cutter, a plurality of hobbing cutter distribute on the horizontal direction, the reaming arm on also be provided with a plurality of hobbing cutter.
Further preferably, the reaming arm is provided with a reaming surface and an installation surface, the reaming surface is always kept in the vertical direction, an included angle larger than 90 degrees is formed between the installation surface and the reaming surface, and the plurality of hobs are arranged on the installation surface.
Further preferably, a wear plate is arranged on the hole expanding surface, and the wear plate is provided with a raised wear strip.
According to the technical scheme, preferably, an air channel and a mud channel are arranged in the drilling tool, the air pressure equipment can be communicated with the air channel, and the mud treatment equipment can be communicated with the mud channel.
Preferably, the device further comprises a cutting ring and a pipe piece, the hoisting equipment is used for hoisting the cutting ring through a pull wire, and the hoisting machine is used for moving the pipe piece.
More preferably, the lifting equipment is provided with a plurality of lifting equipment, and the plurality of lifting equipment uniformly distribute and hang the notch ring.
Another object of the invention is to provide a method of constructing a vertical shaft.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vertical shaft construction method comprises the following steps:
a. excavating a foundation pit, manufacturing a locking notch, installing a notch ring, arranging hoisting equipment, connecting a pull wire of the hoisting equipment to the notch ring,
b. installing a frame, arranging a drilling machine, a crane, air compression equipment and slurry treatment equipment, hoisting a drilling tool and carrying out drilling construction,
c. segments are assembled on the cutting ring by a crane, when drilling is carried out, the segments exceeding the ground are assembled when the length is less than 100mm, the segments are always kept to leak out of the ground for a certain height,
d. after drilling to the target depth, removing the drilling tool, sealing the bottom by adopting a shaft, replacing the bentonite on the periphery of the segment after the bottom concrete meets the requirement, cementing the well,
e. and (4) cutting off the cut ring and the pull wire of the hoisting equipment, removing the hoisting equipment, and finishing construction.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1) equipment and segment operation space is reserved through the heightening platform, convenience of construction operation is guaranteed, and construction efficiency and construction safety are greatly improved;
2) the cutter head is excavated on the full section, so that the construction efficiency is greatly improved, and the drilling tool is removed without interfering with the segment;
3) and the sinking segment is synchronously supported, so that the construction safety is effectively ensured.
Drawings
FIG. 1 is a schematic view of a construction apparatus according to the present embodiment;
FIG. 2 is a schematic view of a drilling tool in the present embodiment;
FIG. 3 is an enlarged view of portion A of FIG. 1;
fig. 4 and 5 are schematic distribution diagrams of the hoisting device in this embodiment.
In the drawings above:
10. a platform; 11. a support leg; 12. a workspace;
20. a drilling machine main machine; 21. drilling a rod; 22. a guide; 220. a guider fixing frame; 221. supporting the boot; 222. a rod member; 223. an oil cylinder; 224. a wear plate; 225. wear resistant strips; 23. a central barrel; 24. a cutter head; 240. a cutter head fixing frame; 241. hobbing cutters; 242. a rod member; 243. an oil cylinder; 245. a hole expanding surface; 246. a mounting surface; 247. a wear plate; 248. wear resistant strips; 25. a transition joint;
3. hoisting a machine;
4. hoisting equipment; 40. pulling a wire;
5. an air compression device;
6. slurry treatment equipment;
70. a notch ring; 71. a tube sheet.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A vertical shaft construction device as shown in fig. 1 comprises a frame, a drilling machine, a crane 3, a hoisting device 4, a pneumatic device 5, a slurry treatment device 6, a notch ring 70, a segment 71 and the like. Wherein:
the frame comprises a platform 10 and a plurality of supporting legs 11, wherein the plurality of supporting legs 11 are supported at the bottom of the platform 10, so that the bottom of the platform 10 is overhead and a working space 12 is formed. Platform 10 adopts frame type steel construction, and the primary function is to raise rig host computer 20, reserves the operation space of installation hoisting equipment 4 and assembling section of jurisdiction 71 etc. and hoist 3 transports section of jurisdiction 71, and section of jurisdiction 71 assembles all and operates at workspace 12 of platform 10 lower part.
The drilling machine comprises a drilling machine main body 20 and a drilling tool connected to the bottom of the drilling machine main body 20. The rig main body 20 is provided on the platform 10. The drilling tool comprises a drill rod 21, a guide 22 connected to the bottom end of the drill rod 21, a central cylinder 23 with one end connected to the bottom of the guide 22, and a cutter head 24 connected to the other end of the central cylinder 23. In this embodiment: a transition joint 25 is also connected between the drill rod 21 and the guide 22, the caliber of one end of the transition joint 25 connected with the drill rod 21 is smaller than that of one end connected with the guide 22 and is in a horn shape, and the drill rod 21, the transition joint 25, the guide 22, the central cylinder 23 and the cutter head 24 are connected by flanges. During construction, a driving part of the drilling machine main body 20 drives a drilling tool to rotate so as to achieve the aim of excavation, and a drilling rod 21 is additionally arranged along with the increasing drilling depth.
In this embodiment: the guider 22 includes a guider fixing frame 220, a plurality of link mechanisms connected around the fixing frame, and a supporting shoe 221 connected to the link mechanisms, a supporting surface of the supporting shoe 221 is always kept in a vertical direction, and the link mechanisms drive the supporting shoe 221 to extend out or retract in a radial direction of the guider fixing frame 220. Specifically, the method comprises the following steps: the link mechanism comprises a group of rod pieces 222 and an oil cylinder 223 (hydraulic oil cylinder) which are parallel up and down, one end of the group of rod pieces 222 is rotatably connected with the guider fixing frame 220, the supporting shoe 221 is connected with the other end of the group of rod pieces 222, one end of the oil cylinder 223 is connected with the guider fixing frame 220, the other end of the oil cylinder 223 is connected with the rod piece 222 above, and the diameter changing is realized through the expansion and contraction of the oil cylinder 223, and the diameter changing range is large.
The supporting surface of the supporting shoe 221 is provided with a wear-resisting plate 224, the wear-resisting plate 224 is provided with a plurality of raised wear-resisting strips 225, and the illustrated wear-resisting strips 225 transversely extend along the wear-resisting plate 224, so that the strength and the wear resistance of the supporting surface of the supporting shoe 221 are improved, and the service life is prolonged.
In this embodiment: the cutter head 24 includes a cutter head holder 240, a plurality of link mechanisms connected to the periphery of the cutter head holder 240, a hole expanding arm connected to the link mechanisms, and a hob 241, and the link mechanisms drive the hole expanding arm to extend out or retract in the radial direction of the cutter head holder 240, as shown in fig. 2. Specifically, the method comprises the following steps:
the link mechanism comprises a group of rod pieces 242 and an oil cylinder 243 (hydraulic oil cylinder) which are parallel up and down, one end of the group of rod pieces 242 is rotatably connected with the cutter head fixing frame 240, the reaming arm is connected with the other end of the group of rod pieces 242, one end of the oil cylinder 243 is connected with the cutter head fixing frame 240, the other end of the oil cylinder 243 is connected with the rod piece 242 above, and the opening and closing of the reaming arm are controlled through the expansion and contraction of the oil cylinder 223.
The reaming arm is provided with a reaming surface 245 and a mounting surface 246, the reaming surface 245 is always kept in the vertical direction in the process of extending and retracting the oil cylinder 223, and an included angle larger than 90 degrees is formed between the mounting surface 246 and the reaming surface 245. The wear plate 247 is disposed on the counterbore side 246, and the wear plate 247 has raised wear strips 248, the wear strips 248 being shown as extending longitudinally along the wear plate 247 to increase durability.
The plurality of roller cutters 241 are provided on both the bottom of the cutter head holder 240 and the mounting surface 246 of the reamer arm, and the plurality of roller cutters 241 on the bottom of the cutter head holder 240 are distributed in the horizontal direction.
An air channel and a slurry channel (not shown in the figure) are arranged in the drilling tool, and particularly, the air channel and the slurry channel extend from the cutter head 24 to the top of the drill rod 21, the air compression device 5 can be communicated with the air channel, and the slurry treatment device 6 can be communicated with the slurry channel, so that the requirement of gas lift reverse circulation slurry discharge is met.
The crane 3 is connected to the bottom of the platform 10 and is movable relative to the platform, and is a device for assembling the segments 71 in construction. I.e. the movement of the crane 3, the assembly of the segments 71 is completed in the working space 12 below the platform 10, as shown in fig. 3.
The hoisting equipment 4 is arranged in the working space 12, and the hoisting equipment 4 is specifically such as steel strand tension jacks, generally 4 groups, 6 groups, 8 groups and the like, and is configured adaptively according to the weight of the shaft and uniformly arranged around the shaft. The sets of lifting devices 4 form a system that, acting in concert, lifts the slit ring 70 to ensure that the segment 71 sinks smoothly, as shown in fig. 4 and 5.
The air compression equipment 5 and the slurry treatment equipment 6 are both arranged on the platform 10, and the air compression equipment 5 provides high-pressure air for gas lift reverse circulation; the slurry treatment equipment 6 is used for filtering and tempering the discharged slurry and then reflowing the slurry into the well to realize continuous circulation of the discharged slurry.
The following specifically explains a method for vertical shaft construction by using the device in the embodiment, and specifically includes:
a. excavating a foundation pit, making a locking notch, installing a notch ring 70, installing hoisting equipment 4, installing 4 groups as shown in figure 4, connecting a stay wire 40 of the hoisting equipment 4 to the notch ring 70,
b. the installation rack (comprising a platform 10 and supporting legs 11) is arranged above the platform 10 and is provided with a drilling machine main body 10, an air compression device 5 and a slurry treatment device 6, the bottom of the platform 10 is provided with a crane 3, a drilling tool is hoisted at the bottom of the drilling machine main body 10 for drilling construction,
c. the segment 71 is moved and continuously assembled on the incision ring 70 by adopting the crane 3, when drilling, the segment 71 which exceeds the ground is assembled when the distance is less than 100mm, the segment 70 is always kept to leak out of the ground for a certain height,
d. after drilling to the target depth, removing the drilling tool, sealing the bottom by adopting a shaft, replacing bentonite on the periphery of the pipe piece 71 after the bottom concrete meets the requirement, cementing the well,
e. and (5) cutting off the cut ring 70 and the pull wire of the hoisting equipment 4, and removing the hoisting equipment 4 to finish the construction.
The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this means. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210656058.6A CN114922627A (en) | 2022-06-10 | 2022-06-10 | A vertical shaft construction device and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210656058.6A CN114922627A (en) | 2022-06-10 | 2022-06-10 | A vertical shaft construction device and construction method |
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| Publication Number | Publication Date |
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| CN114922627A true CN114922627A (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210656058.6A Pending CN114922627A (en) | 2022-06-10 | 2022-06-10 | A vertical shaft construction device and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115596446A (en) * | 2022-10-20 | 2023-01-13 | 中交天和机械设备制造有限公司（Cn） | A construction method for shaft |
| CN115822609A (en) * | 2023-02-09 | 2023-03-21 | 中国建筑西南勘察设计研究院有限公司 | A construction control method with variable diameter of vertical shaft |
| CN116291471A (en) * | 2023-03-29 | 2023-06-23 | 中铁隧道局集团有限公司 | Construction Method and Excavation Equipment of Large Diameter Shaft in Upper Soft and Lower Hard Ground |
| CN116856914A (en) * | 2023-08-17 | 2023-10-10 | 中交天和机械设备制造有限公司 | Vertical shaft drilling machine capable of measuring construction verticality in real time |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR1380256A (en) * | 1964-01-23 | 1964-11-27 | Bade & Co Gmbh | Device and method for sinking a well |
| CN103899316A (en) * | 2014-03-21 | 2014-07-02 | 中铁工程装备集团有限公司 | Novel drilling method for shaft drilling machine |
| CN210509184U (en) * | 2019-09-27 | 2020-05-12 | 中铁工程装备集团有限公司 | Inclined shaft TBM prevents swift current car device |
| CN211950349U (en) * | 2020-03-30 | 2020-11-17 | 洛阳九久科技股份有限公司 | A variable-diameter vertical shaft drill bit for wind power generation foundation piles |
| CN113047844A (en) * | 2021-03-17 | 2021-06-29 | 中国铁建重工集团股份有限公司 | Sinking pipe sheet type vertical shaft construction method |
-
2022
- 2022-06-10 CN CN202210656058.6A patent/CN114922627A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1380256A (en) * | 1964-01-23 | 1964-11-27 | Bade & Co Gmbh | Device and method for sinking a well |
| CN103899316A (en) * | 2014-03-21 | 2014-07-02 | 中铁工程装备集团有限公司 | Novel drilling method for shaft drilling machine |
| CN210509184U (en) * | 2019-09-27 | 2020-05-12 | 中铁工程装备集团有限公司 | Inclined shaft TBM prevents swift current car device |
| CN211950349U (en) * | 2020-03-30 | 2020-11-17 | 洛阳九久科技股份有限公司 | A variable-diameter vertical shaft drill bit for wind power generation foundation piles |
| CN113047844A (en) * | 2021-03-17 | 2021-06-29 | 中国铁建重工集团股份有限公司 | Sinking pipe sheet type vertical shaft construction method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115596446A (en) * | 2022-10-20 | 2023-01-13 | 中交天和机械设备制造有限公司（Cn） | A construction method for shaft |
| CN115822609A (en) * | 2023-02-09 | 2023-03-21 | 中国建筑西南勘察设计研究院有限公司 | A construction control method with variable diameter of vertical shaft |
| CN116291471A (en) * | 2023-03-29 | 2023-06-23 | 中铁隧道局集团有限公司 | Construction Method and Excavation Equipment of Large Diameter Shaft in Upper Soft and Lower Hard Ground |
| CN116856914A (en) * | 2023-08-17 | 2023-10-10 | 中交天和机械设备制造有限公司 | Vertical shaft drilling machine capable of measuring construction verticality in real time |
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