WO2020238206A1 - 一种多叶轮被动旋转搅拌式沉井旋挖钻头 - Google Patents

一种多叶轮被动旋转搅拌式沉井旋挖钻头 Download PDF

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Publication number
WO2020238206A1
WO2020238206A1 PCT/CN2019/130324 CN2019130324W WO2020238206A1 WO 2020238206 A1 WO2020238206 A1 WO 2020238206A1 CN 2019130324 W CN2019130324 W CN 2019130324W WO 2020238206 A1 WO2020238206 A1 WO 2020238206A1
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WIPO (PCT)
Prior art keywords
impeller
passive
cutting edge
drill bit
hollow main
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PCT/CN2019/130324
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English (en)
French (fr)
Inventor
伊国栋
张绍举
晋哲楠
张树有
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浙江大学
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Application filed by 浙江大学 filed Critical 浙江大学
Priority to US17/042,925 priority Critical patent/US11692401B2/en
Publication of WO2020238206A1 publication Critical patent/WO2020238206A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D23/00—Caissons; Construction or placing of caissons
    • E02D23/08—Lowering or sinking caissons
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22—Placing by screwing down
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B12/00—Accessories for drilling tools
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/003—Drilling with mechanical conveying means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/36—Foundations formed in moors or bogs
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/52—Submerged foundations, i.e. submerged in open water
    • E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground

Definitions

  • the invention is mainly used for a large-scale hydraulic reverse circulation drilling rig in the field of construction of a caisson in a bridge tower, and particularly relates to a multi-impeller passive rotating agitation type caisson rotary drilling bit.
  • the construction method of the reverse circulation drilling rig Inject the original mud from the drill pipe into the well hole, and use a vacuum pump or other methods (such as air suction pump) to suck the mud mixed with the sludge from the drill pipe to achieve the purpose of discharging the sludge.
  • a vacuum pump or other methods such as air suction pump
  • the main common soft soils are silt and silty clay. Its main properties are large thickness, high void ratio, high compressibility and sensitivity, high compressibility, and more powder on one side. , With thixotropy, poor engineering properties.
  • Existing hydraulic drilling rigs used for drilling and pouring construction of caisson wells in bridge towers have poor mixing effect on silt and water, low mud suction efficiency, and difficulty in draining mud, resulting in low drilling efficiency, clogging of mud suction pipes, clogging and even breaking drill.
  • the present invention proposes a multi-impeller passive rotary stirring type caisson rotary drilling bit, which is mainly used for the drilling and pouring construction of the caisson in the middle tower of the bridge by the reverse circulation drilling rig.
  • the rotating bracket rotates synchronously with the drill bit and the hollow drill rod, driving the four impeller shafts to rotate synchronously around the central axis of the drill bit.
  • the impeller is in contact with the wall of the hole.
  • the impeller rotates around its respective impeller shaft opposite to the direction of rotation of the drill bit.
  • the relative rotation between the cutting edge and the impeller is used to enhance the stirring effect of the mud in the hole during the drilling process, so that the mud produced by the drilling and water are more fully mixed to form the mud, which passes through the mud suction port and the hollow drill shank.
  • the negative pressure will discharge the mud.
  • the invention includes a hollow main drill rod, a drill bit, a cutting edge, an impeller shaft, a passive impeller and a rotating support;
  • the rotating support is mainly composed of a central disc, four short beams and four peripheral discs, and the outer surface of the central disc is evenly distributed in the circumferential direction There are four short beams, and the end of each short beam is connected with a peripheral disk;
  • the hollow main drill rod passes through the central disk and is fixedly connected to the rotating bracket through the central disk.
  • the mud suction port of the drill pipe, the bottom end of the hollow main drill pipe is coaxially fixed with a drill bit.
  • the drill bit has four cutting edges evenly distributed in the circumferential direction, and each cutting edge has a number of teeth evenly distributed along the outside of the cutting direction; four peripheral discs It is arranged opposite to the four cutting edges up and down.
  • each peripheral disc and the upper surface of its corresponding cutting edge are equipped with two sealing end caps with upper and lower opposite built-in sealing rings, which are installed between the sealing end cap and the peripheral disc, and between the sealing end cap and the cutting edge.
  • An impeller shaft is connected between each short beam and its corresponding cutting edge.
  • the upper and lower ends of the impeller shaft pass through the sealing end cover and are respectively connected with the peripheral disc and cutting edge through bearings; each impeller shaft is fixedly connected with a passive Impeller, each passive impeller includes six blades that are uniformly distributed along the circumferential direction of the impeller shaft with the impeller shaft as the center, and the angle interval between two adjacent blades is 60°.
  • the hollow main drill rod drives the cutting edge and the rotating bracket to move axially while rotating around the central axis of the hollow main drill rod, thereby driving the impeller shaft to rotate around the central axis of the hollow main drill rod, and the blades of the passive impeller rotate on the rotating bracket
  • the hole wall gives the passive impeller a force opposite to the rotation direction of the rotating support, and the passive impeller generates a relative rotation opposite to the rotation direction of the rotating support.
  • the sealing end cover is used to limit the radial displacement of the impeller shaft and has a sealing effect.
  • the hollow main drill rod is a hollow main drill rod, and a hollow mud drain pipeline directly connected to the ground mud discharge equipment is in the middle of the drill rod, which is used to discharge the mud formed by mixing the mud and water during the drilling process of the tower caisson in the bridge .
  • the mud suction port is elliptical and communicates with the hollow mud discharge pipe in the middle of the hollow main drill rod; the mud suction port and the passive impeller are located at the same level.
  • the working range of the tip of the passive impeller blade slightly exceeds the maximum working range of the cutting edge to ensure that the passive impeller generates passive rotation.
  • the invention enhances the stirring effect of the silt and water in the hole during the drilling process through the relative rotation of the impeller and the cutting edge in the opposite direction without adding additional power, thereby accelerating the mixing and formation of mud, thereby improving the drilling process
  • the efficiency and safety of drilling mud can be improved.
  • Figure 1 is a front view of the present invention
  • Figure 2 is a top view of the present invention.
  • the present invention includes a hollow main drill rod 10, a drill bit 1, a cutting edge 3, an impeller shaft 6, a passive impeller 5 and a rotating bracket 9;
  • the rotating bracket 9 is mainly composed of a central disc, four short beams and four
  • the outer surface of the central disc is composed of four short beams evenly distributed in the circumferential direction.
  • the end of each short beam is connected with a peripheral disc;
  • the hollow main drill rod 10 passes through the central disc and passes through the central disc and the rotating support 9 is fixedly connected, the bottom of the hollow main drill rod 10 is provided with a mud suction port 4 that penetrates the hollow main drill rod 10 front and rear.
  • the bottom end of the hollow main drill rod 10 is coaxially fixed with a drill bit 1, and the drill bit 1 has four cutting edges 3 evenly distributed in the circumferential direction. , Each cutting edge 3 has several teeth 2 evenly distributed along the outer side of the cutting direction.
  • each peripheral disc and the upper surface of its corresponding cutting edge 3 are equipped with two sealing end caps 7 with upper and lower opposite built-in sealing rings.
  • the sealing end cap 7 and the peripheral disc A bearing 8 is installed between the sealing end cover 7 and the cutting edge 3, and an impeller shaft 6 is connected between each short beam and its corresponding cutting edge 3.
  • the upper and lower ends of the impeller shaft 6 pass through the sealing end cover 7
  • Each impeller shaft 6 is connected with the peripheral disc and the cutting edge 3 through a bearing 8; each impeller shaft 6 is fixedly connected with a passive impeller 5, and each passive impeller 5 includes six blades uniformly distributed along the circumferential direction of the impeller shaft 6 with the impeller shaft 6 as the center. , The angle between two adjacent blades is 60° apart.
  • the four peripheral discs are arranged opposite to the four cutting edges 3 up and down.
  • the rotation direction of the passive impeller 5 is opposite to that of the cutting edge 3, and the working range of the blade end of the passive impeller 5 slightly exceeds the maximum working range of the cutting edge 3 to ensure that the passive impeller 5 Generate passive rotation.
  • the drill bit 1 first drills into the soil and keeps the drill bit running stably in the axial direction during the subsequent drilling process; the four cutting edges 3 continue to cut the underwater silt soft soil after the drill bit 1 penetrates the soil , The uniformly distributed cutter teeth 2 on the outside of the cutting edge 3 cooperate with the cutting edge 3 to enhance the cutting effect on the silt soft soil; the rotating support 9 moves and rotates synchronously with the drill bit 1 during the drilling construction process.
  • the impeller shaft 6 rotates with the rotating support 9 around the central axis of the drill bit 1, so that the passive impeller 5 contacts the hole wall 11, and under the action of the rotation of the rotating support 9 and the stationary hole wall 11, the direction of rotation is opposite to the cutting edge 3
  • the relative rotation of the relative motion can enhance the stirring effect of the relative movement on the mud, improve the mud discharge efficiency during the drilling process, thereby improving the drilling efficiency, and reducing the clogging of the suction pipe and the drill bit caused by the poor mud discharge during the drilling process Phenomenon such as blockage or even breakage occurs.
  • the negative pressure generated by the rapid rotation between the hollow main drill pipe 10 and the borehole causes the mud to be sucked in from the mud suction port 5, and finally through the hollow mud pipe directly connected to the ground mud discharge equipment, and quickly discharged from the bridge middle tower caisson borehole
  • the sludge produced in the process is mixed with water to form a slurry.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • Earth Drilling (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

一种多叶轮被动旋转搅拌式沉井旋挖钻头，主要用于反循环钻机在桥梁中塔沉井的钻孔灌注施工，包括空心主钻杆（10）、钻头（1）、切削刃（3）、叶轮轴（6）、被动叶轮（5）和旋转支架（9）；通过在钻头（1）周围均布四组被动叶轮（5），使其在钻头（1）工作的过程中，通过与孔壁（11）的接触，被动产生与钻头（1）旋转方向相反的相对转动，从而加快钻孔过程中淤泥与水充分混合形成泥浆，增强钻孔过程中钻头（1）对泥浆的搅拌作用。

Description

一种多叶轮被动旋转搅拌式沉井旋挖钻头 技术领域
本发明主要用于桥梁中塔沉井施工领域的大型液压反循环钻机，具体涉及一种多叶轮被动旋转搅拌式沉井旋挖钻头。
背景技术
反循环钻机的施工方法：将原始泥浆由钻杆外注入井孔，用真空泵或其他方法(如空气吸泥泵机)将与淤泥混合后的泥浆从钻杆中吸出，以达到排出淤泥的目的。
桥梁中塔沉井施工过程中，常见的主要软土有淤泥及淤泥质黏土，其主要性质为厚度较大，孔隙比、压缩性及灵敏度较高，具有高压缩性，片面含较多粉粒，具触变性，工程性质差。现有的用于桥梁中塔沉井钻孔灌注施工的液压钻机对淤泥和水的混合效果不好，吸泥效率低，泥浆难以排出，导致钻孔效率低、堵塞吸泥管以及淤塞甚至折断钻头。
发明内容
为了解决背景技术中的问题，本发明提出了一种多叶轮被动旋转搅拌式沉井旋挖钻头，主要用于反循环钻机在桥梁中塔沉井的钻孔灌注施工。
在钻孔施工过程中，旋转支架随钻头和空心钻杆同步转动，带动四根叶轮轴围绕钻头的中心轴线同步转动。在叶轮轴的转动过程中，叶轮与孔壁接触，在旋转支架转动和静止孔壁的作用下，叶轮绕其各自的叶轮轴产生与钻头旋转方向相反的相对转动。利用这种切削刃与叶轮之间的相对转动，增强钻孔过程中对孔内泥浆的搅拌作用，使钻孔产生的淤泥与水更充分的混合形成泥浆，通过吸泥口和中空钻柄内的负压，将泥浆排出。
本发明采用的技术方案如下：
本发明包括空心主钻杆、钻头、切削刃、叶轮轴、被动叶轮和旋转支架；旋转支架主要由中心圆盘、四根短横梁和四个外围圆盘组成，中心圆盘外侧面沿周向均布有四根短横梁，每根短横梁末端均连接有一个外围圆盘；空心主钻杆穿过中心圆盘且通过中心圆盘与旋转支架固定相连，空心主钻杆底部开有前后贯穿空心主钻杆的吸泥口，空心主钻杆底端同轴固定有钻头，钻头沿周向均布有四片切削刃，每片切削刃沿切削方向的外侧均匀分布有若干刀齿；四个外 围圆盘与四片切削刃上下相对布置。
每个外围圆盘下表面和其对应的切削刃上表面均安装有两个上下相对内置密封圈的密封端盖，密封端盖与外围圆盘之间、密封端盖与切削刃之间均安装有轴承，用于承载叶轮轴的轴向载荷。每根短横梁与其对应的切削刃之间连接有一根叶轮轴，叶轮轴上下两端穿过密封端盖后分别通过轴承与外围圆盘和切削刃连接；每根叶轮轴中间均固定连接有被动叶轮，每个被动叶轮包括六片以叶轮轴为中心沿叶轮轴周向均布的叶片，相邻两叶片之间的夹角间隔60°。
钻孔过程中，空心主钻杆带动切削刃和旋转支架轴向移动的同时绕空心主钻杆中心轴线转动，从而带动叶轮轴绕空心主钻杆中心轴线转动，被动叶轮的叶片在旋转支架转动过程中与孔壁接触，孔壁给予被动叶轮沿旋转支架转动方向相反的作用力，被动叶轮产生与旋转支架旋转方向相反的相对转动。
所述密封端盖用于限制叶轮轴径向位移且具有密封作用。
所述空心主钻杆为空心主钻杆，钻杆中间为与地面排泥设备直通的空心排泥管道，用以排出桥梁中塔沉井钻孔过程中产生的淤泥与水混合而形成的泥浆。
所述吸泥口呈椭圆形且与空心主钻杆中间的空心排泥管相连通；吸泥口与被动叶轮位于同一水平高度。
所述被动叶轮旋转过程中，被动叶轮叶片末端的工作范围略超出切削刃的最大工作范围，以确保被动叶轮产生被动旋转。
本发明的有益效果：
本发明在不增加额外动力的情况下，通过叶轮与切削刃方向相反的相对转动，增强钻孔过程中对孔内淤泥与水的搅拌作用，从而加快泥浆的混合与形成，进而提高钻孔过程中对产生泥浆的排出效率，提高钻孔的效率和安全性。
附图说明
图1为本发明的主视图；
图2为本发明的俯视图。
图中：1、钻头；2、刀齿；3、切削刃；4、吸泥口；5、被动叶轮；6、叶轮轴；7、密封端盖；8、轴承；9、旋转支架；10、空心主钻杆；11、孔壁。
具体实施方式
下面结合附图和实施例对本发明作进一步说明。
如图1所示，本发明包括空心主钻杆10、钻头1、切削刃3、叶轮轴6、被动叶轮5和旋转支架9；旋转支架9主要由中心圆盘、四根短横梁和四个外围圆盘组成，中心圆盘外侧面沿周向均布有四根短横梁，每根短横梁末端均连接有 一个外围圆盘；空心主钻杆10穿过中心圆盘且通过中心圆盘与旋转支架9固定相连，空心主钻杆10底部开有前后贯穿空心主钻杆10的吸泥口4，空心主钻杆10底端同轴固定有钻头1，钻头1沿周向均布有四片切削刃3，每片切削刃3沿切削方向的外侧均匀分布有若干刀齿2。
如图1和图2所示，每个外围圆盘下表面和其对应的切削刃3上表面均安装有两个上下相对内置密封圈的密封端盖7，密封端盖7与外围圆盘之间、密封端盖7与切削刃3之间均安装有轴承8，每根短横梁与其对应的切削刃3之间连接有一根叶轮轴6，叶轮轴6上下两端穿过密封端盖7后分别通过轴承8与外围圆盘和切削刃3连接；每根叶轮轴6中间均固定连接有被动叶轮5，每个被动叶轮5包括六片以叶轮轴6为中心沿叶轮轴6周向均布的叶片，相邻两叶片之间的夹角间隔60°。四个外围圆盘与四片切削刃3上下相对布置。
如图2所示，钻孔过程中，被动叶轮5的旋转方向与切削刃3的旋转方向相反，且被动叶轮5叶片末端的工作范围略超出切削刃3的最大工作范围，以确保被动叶轮5产生被动旋转。
实施例：
在钻孔的过程中，钻头1先钻入土体并在后续钻孔过程中保持钻头沿轴向稳定运行；四片切削刃3在钻头1钻入土体之后继续对水底淤泥软土进行切削，切削刃3外侧均匀分布的刀齿2配合切削刃3增强对淤泥软土的切削作用；旋转支架9在钻孔施工过程中随着钻头1同步移动和转动。
在钻孔过程中叶轮轴6随旋转支架9绕钻头1中心轴线旋转，使被动叶轮5与孔壁11接触，在旋转支架9转动和静止孔壁11的作用下，产生与切削刃3旋转方向相反的相对转动，以此增强相对运动对泥浆的搅拌作用，提高钻孔过程中的排泥效率，进而提高钻孔的效率，减少钻孔过程中因淤泥排出不畅导致的吸泥管堵塞以及钻头淤塞甚至折断等现象的发生。通过空心主钻杆10和钻孔之间快速旋转产生的负压，使泥浆从吸泥口5吸入，最后通过与地面排泥设备直通的空心排泥管道，快速排出桥梁中塔沉井钻孔过程中产生的淤泥与水混合形成的泥浆。

Claims (6)

  1. 一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：包括空心主钻杆(10)、钻头(1)、切削刃(3)、叶轮轴(6)、被动叶轮(5)和旋转支架(9)；旋转支架(9)主要由中心圆盘、四根短横梁和四个外围圆盘组成，中心圆盘外侧面沿周向均布有四根短横梁，每根短横梁末端均连接有一个外围圆盘；空心主钻杆(10)穿过中心圆盘且通过中心圆盘与旋转支架(9)固定相连，空心主钻杆(10)底部开有前后贯穿空心主钻杆(10)的吸泥口(4)，空心主钻杆(10)底端同轴固定有钻头(1)，钻头(1)沿周向均布有四片切削刃(3)，每片切削刃(3)沿切削方向的外侧均匀分布有若干刀齿(2)；四个外围圆盘与四片切削刃(3)上下相对布置；
    每个外围圆盘下表面和其对应的切削刃(3)上表面均安装有内置密封圈的密封端盖(7)，密封端盖(7)与外围圆盘之间、密封端盖(7)与切削刃(3)之间均安装有轴承(8)，每个外围圆盘与其对应的切削刃(3)之间连接有一根叶轮轴(6)，叶轮轴(6)上下两端穿过密封端盖(7)后分别通过轴承(8)与外围圆盘和切削刃(3)连接；每根叶轮轴(6)中间均固定连接有被动叶轮(5)，每个被动叶轮(5)包括六片以叶轮轴(6)为中心沿叶轮轴(6)周向均布的叶片。
  2. 根据权利要求1所述的一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：钻孔过程中，空心主钻杆(10)带动切削刃(3)和旋转支架(9)轴向移动的同时绕空心主钻杆(10)中心轴线转动，从而带动叶轮轴(6)绕空心主钻杆(10)中心轴线转动，被动叶轮(5)的叶片在旋转支架(9)转动过程中与孔壁(11)接触，孔壁(11)给予被动叶轮(5)沿旋转支架(9)转动方向相反的作用力，被动叶轮(5)产生与旋转支架(9)旋转方向相反的相对转动。
  3. 根据权利要求1所述的一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：所述密封端盖(7)用于限制叶轮轴(6)径向位移且具有密封作用。
  4. 根据权利要求1所述的一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：所述空心主钻杆(10)为空心钻杆，钻杆中间为与地面排泥设备直通的空心排泥管道。
  5. 根据权利要求4所述的一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：所述吸泥口(4)呈椭圆形且与空心主钻杆(10)中间的空心排泥管相 连通；吸泥口(4)与被动叶轮(5)位于同一水平高度。
  6. 根据权利要求1所述的一种多叶轮被动旋转搅拌式沉井旋挖钻头，其特征在于：所述被动叶轮(5)旋转过程中，被动叶轮(5)叶片末端的工作范围超出切削刃(3)的最大工作范围。
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