WO2020233127A1 - 一种钻搅结合的大截面沉井高效旋挖钻头装置 - Google Patents

一种钻搅结合的大截面沉井高效旋挖钻头装置 Download PDF

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Publication number
WO2020233127A1
WO2020233127A1 PCT/CN2019/130319 CN2019130319W WO2020233127A1 WO 2020233127 A1 WO2020233127 A1 WO 2020233127A1 CN 2019130319 W CN2019130319 W CN 2019130319W WO 2020233127 A1 WO2020233127 A1 WO 2020233127A1
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Prior art keywords
transmission box
gear transmission
drilling
drill rod
gear
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PCT/CN2019/130319
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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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Zhejiang University
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Zhejiang University
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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
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units

Definitions

  • the invention is a large-scale hydraulic reverse circulation drilling rig used in the field of bridge construction, and specifically relates to a high-efficiency rotary drilling bit device for a large section caisson combined with drilling and stirring.
  • the bored pile construction method is widely used in the construction of bridges and piers.
  • the current drilling equipment can be divided into: positive circulation drilling rig, reverse circulation drilling rig, submersible drilling rig, rotary drilling rig, impact drilling rig, etc.
  • Reverse circulation drilling rigs have the advantages of fast drilling speed, high construction efficiency, and smooth discharge of drilling slag when drilling into mudstone layers, so they are widely used.
  • the common main soil layers 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. , It is thixotropic and has poor engineering properties.
  • Existing hydraulic drilling rigs used for drilling and pouring construction of caisson wells in bridge towers have low mud suction efficiency, and mud mixed with drilling slag is difficult to discharge, resulting in low drilling efficiency and safety.
  • the present invention proposes a high-efficiency rotary drilling bit device for large cross-section caisson combined with drilling and stirring, which is mainly used for drilling and pouring construction of reverse circulation drilling rigs in bridge tower caisson.
  • the invention includes a gear transmission box, a driving gear, a driven gear, a hollow main drill rod, an auxiliary drill rod, a main drill bit, and an auxiliary drill bit;
  • the outer contour of the gear transmission box is mainly composed of a square and four vertices centered on the four squares.
  • Circular composition, the driving gear and four driven gears are located inside the gear transmission box, the driving gear is evenly distributed along the circumferential direction with four driven gears, each driven gear meshes with the driving gear, the driving gear is located in the gear transmission box In the box surrounded by a square, four driven gears are respectively located in the box surrounded by four circles in the gear transmission box.
  • the middle of the driving gear is connected with a hollow main drill rod through a key
  • the middle of each driven gear is connected with an auxiliary drill rod through a key.
  • the hollow main drill rod and each auxiliary drill rod penetrate the gear transmission box up and down; located at the upper and lower ends of the gear transmission box
  • the outer peripheral surface of the hollow main drill rod is fixedly connected with a positioning plate.
  • a bearing I is installed between each positioning plate and the gear transmission box and sealed by a sealing ring; the hollow main drill rod passes through the bearings on the upper and lower ends of the gear transmission box.
  • each auxiliary drill rod is connected with the gear transmission box through the bearing II on the upper and lower end faces of the gear transmission box.
  • the bottom of the hollow main drill pipe is provided with a suction port that penetrates the hollow main drill rod forward and backward; the bottom end of the hollow main drill pipe is coaxially fixed with the main drill bit, and the bottom end of each auxiliary drill pipe is coaxially fixed with the auxiliary drill bit, the main drill bit and the auxiliary drill pipe.
  • the drill bit has four cutting edges uniformly distributed along the circumferential direction, and each cutting edge has a number of teeth evenly distributed along the outside of the cutting direction.
  • the bottom position of the auxiliary drill bit is higher than the upper boundary position of the cutting edge of the main drill bit.
  • the hollow main drill rod drives the driving gear to rotate while driving the four driven gears meshed with the driving gear to rotate, and the four driven gears respectively drive the four auxiliary drill rods to rotate;
  • the hollow main drill rod drives the gear box synchronization shaft through the positioning plate Moving forward, the gear box drives the four auxiliary drill rods to move synchronously.
  • the sealing end cover is used to limit the radial displacement of the auxiliary drill rod and has a sealing effect.
  • the outer diameter of the driving gear is greater than the outer diameter of the driven gear, the square outer contour of the gear transmission box matches the outer contour size of the driving gear, and the four circular outer contours of the gear transmission box match the outer contour size of the four driven gears .
  • the mud suction port is elliptical and communicates with the hollow mud discharge pipe inside the hollow main drill rod; the mud suction port is not higher than the upper boundary position of the cutting edge of the auxiliary bit, and not lower than the lower boundary position of the cutting edge of the auxiliary bit.
  • the gear transmission box does not directly contact the hollow main drill rod, and the gear transmission box does not rotate with any drill bit during the drilling process.
  • the driving gear and the driven gear are respectively positioned axially through the shoulders and sleeves of the hollow main drill rod and the auxiliary drill rod.
  • the drilling radius of the main drill bit and its cutting edge is larger than that of the secondary drill bit and its cutting edge, so as to ensure that the gear transmission box does not interfere with the hole wall formed after drilling.
  • the present invention applies the gear transmission to the drill bit of the reverse circulation drilling rig, so that during the construction of the caisson in the middle tower of the bridge, the transmission between the gears is used to provide power for the four auxiliary drill bits, without the need for additional power sources.
  • the main drill bit and the auxiliary drill bit can cut the sludge at the same time, and a deep hole with a larger section can be formed in one drilling, which doubles the drilling efficiency.
  • the relative rotation between the cutting edges of the drill bits of the present invention can enhance the stirring effect of the mud, accelerate the mixing and formation of the mud, improve the drilling efficiency and the mud discharge efficiency, and avoid the muddy discharge during the drilling process.
  • the resulting mud suction pipe is blocked and the drill bit is blocked or even broken.
  • Figure 1 is a front view of the structural design diagram of the present invention
  • Figure 2 is a top view of a schematic structural design of the present invention
  • Fig. 3 is a schematic diagram of the cutting range of the main drill and the auxiliary drill of the present invention.
  • the present invention includes a gear transmission box 10, a driving gear 11, a driven gear 9, a hollow main drill rod 14, a secondary drill rod 6, a main drill bit 1 and a secondary drill bit 4; located at the upper and lower ends of the gear transmission box 10
  • the outer peripheral surface of the hollow main drill rod 14 is fixedly connected with a positioning plate 13, and a bearing I16 is installed between each positioning plate 13 and the gear transmission box 10, and is sealed by a sealing ring 12; the hollow main drill rod 14 is passed through a gear
  • the bearings I16 on the upper and lower end surfaces of the transmission box 10 are connected with the gear transmission box 10; the upper and lower end surfaces of the gear transmission box 10 corresponding to the four driven gears 9 are fixed with a sealing end cover 7 for limiting the radial displacement of the auxiliary drill rod 6.
  • the sealing end Bearings II 8 are installed between the cover 7 and the gear transmission box 10 and sealed by a sealing ring 12.
  • Each auxiliary drill rod 6 is connected to the gear transmission box 10 through a bearing II 8 on the upper and
  • the bottom of the hollow main drill rod 14 is provided with a mud suction port 5 that penetrates the hollow main drill rod 14 front and rear; the bottom end of the hollow main drill rod 14 is coaxially fixed with a main drill bit 1, and the bottom end of each auxiliary drill rod 6 is coaxially fixed with an auxiliary
  • the drill bit 4, the main drill bit 1 and the auxiliary drill bit 4 have four cutting edges 3 uniformly distributed in the circumferential direction, and each cutting edge 3 is evenly distributed with a number of teeth 2 along the outside of the cutting direction.
  • the bottom position of the auxiliary drill bit 4 is higher than that of the main drill bit 1.
  • the outer contour of the gear transmission box 10 is mainly composed of a square and four circles with the four vertices of the square as the center.
  • the driving gear 11 and the four driven gears 9 are all located inside the gear transmission box 10.
  • the driving gear 11 has four driven gears 9 evenly distributed in the circumferential direction, and each driven gear 9 meshes with the driving gear 11.
  • the driving gear 11 is located in a box enclosed by a square in the gear transmission box 10.
  • the four driven gears 9 They are respectively located in a box surrounded by four circles in the gear transmission box 10.
  • the driving gear 11 is connected with a hollow main drill rod 14 through a key 15 in the middle, and each driven gear 9 is connected with an auxiliary drill rod 6 through a key 15 in the middle.
  • the hollow main drill rod 14 and each auxiliary drill rod 6 penetrate the gear transmission box up and down. 10.
  • Figure 3 is a schematic diagram of the cutting range of the main drill bit and the auxiliary drill bit of the present invention. It can be seen that when the main drill bit 1 and the auxiliary drill bit 4 cut the sludge at the same time, a single drilling can form a deep hole with a large cross section. Compared with the drill bit device, the drilling efficiency is doubled.
  • the drilling radius of the main drill bit 1 and its cutting edge 3 is larger than that of the auxiliary drill bit 4 and its cutting edge 3, so as to ensure that the gear box 10 does not interfere with the hole wall formed after drilling.
  • the main drill bit 1 first drills into the soil, and the four cutting edges 3 continue to cut the underwater silt soft soil after the main drill bit 1 drills into the soil.
  • the hollow main drill rod 14 drives the driving gear 11 to rotate.
  • the transmission between the gears is used to provide power to the four auxiliary drill bits 4, so that the main drill bit 1 and the auxiliary drill bit 4 can simultaneously cut the sludge without increasing the power source, which greatly increases the forming range of one drilling and doubles
  • the drilling efficiency is improved; at the same time, the relative rotation between the cutting edge of the main drill bit 1 and the cutting edge of the auxiliary drill bit 4 can greatly enhance the stirring effect of the mud, so that the sludge and water produced by the drilling can be more fully mixed to form a slurry.
  • the negative pressure generated by the rapid rotation between the hollow main drill pipe 14 and the borehole causes the mud to be sucked into the mud suction port 5, and the mud is quickly discharged through the hollow mud pipe, which improves the mud removal efficiency during the drilling process.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

一种钻搅结合的大截面沉井高效旋挖钻头装置；包括齿轮传动箱（10）、主动齿轮（11）、从动齿轮（9）、空心主钻杆（14）、副钻杆（6）、主钻头（1）和副钻头（4），四个副钻头（4）在主钻头（1）的上方沿圆周方向均布；通过在箱体上下各安装一个与空心主钻杆（14）固定连接在一起的定位板（13）使齿轮传动箱（10）随着钻孔深度的增加而同步移动；齿轮传动箱（10）外形由一个正方形和以正方形各顶点为圆心的圆形组成；齿轮传动箱（10）内部安装有主动齿轮（11）和从动齿轮（9），主动齿轮（11）通过键（15）与空心主钻杆（14）固定连接在一起，在钻孔过程中随主钻头（1）同步转动；四个从动齿轮（9）均与主动齿轮（11）啮合，并通过键（15）分别带动副钻头（4）转动。本装置提高了钻孔效率和泥浆排出效率，避免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。

Description

一种钻搅结合的大截面沉井高效旋挖钻头装置 技术领域
本发明用于桥梁施工领域的大型液压反循环钻机，具体涉及一种钻搅结合的大截面沉井高效旋挖钻头装置。
背景技术
钻孔灌注桩施工法广泛应用于桥梁码头建设中，目前的钻机设备按照成孔工艺可分为：正循环钻机、反循环钻机、潜水钻机、旋挖钻机、冲击钻机等。反循环钻机具有钻井速度快，施工效率高，钻进泥岩层时钻渣能够顺利排出等优点，因此被广泛使用。
桥梁中塔沉井施工过程中，常见的主要土层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，具有触变性，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吸泥效率低，混合着钻渣的泥浆难以排出，导致钻孔效率和安全性低下。
发明内容
为了解决背景技术中的问题，本发明提出了一种钻搅结合的大截面沉井高效旋挖钻头装置，主要用于反循环钻机在桥梁中塔沉井的钻孔灌注施工。
本发明的技术方案如下：
本发明包括齿轮传动箱、主动齿轮、从动齿轮、空心主钻杆、副钻杆、主钻头和副钻头；齿轮传动箱外轮廓主要由正方形和四个分别以正方形的四个顶点为圆心的圆形组成，主动齿轮和四个从动齿轮均位于齿轮传动箱内部，主动齿轮沿周向均布有四个从动齿轮，每个从动齿轮均与主动齿轮相啮合，主动齿轮位于齿轮传动箱中正方形围成的箱体内，四个从动齿轮分别位于齿轮传动箱中四个圆形围成的箱体内。
主动齿轮中间通过键连接有空心主钻杆，每个从动齿轮中间通过键连接有副钻杆，空心主钻杆与每根副钻杆均上下贯穿齿轮传动箱；位于齿轮传动箱上下端面处的空心主钻杆外周面均固定连接有一块定位板，每块定位板与齿轮传动箱之间均安装有轴承Ⅰ，并通过密封圈实现密封；空心主钻杆通过齿轮传动箱上下端面的轴承Ⅰ与齿轮传动箱连接；四个从动齿轮所对应的齿轮传动箱上下端面均固定有用于限制副钻杆径向位移的密封端盖，密封端盖与齿轮传动箱 之间均安装有轴承Ⅱ，并通过密封圈实现密封，每根副钻杆通过齿轮传动箱上下端面的轴承Ⅱ与齿轮传动箱连接。
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主钻头，每根副钻杆底端均同轴固定有副钻头，主钻头和副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，副钻头底部位置高于主钻头的切削刃上边界位置。
空心主钻杆带动主动齿轮转动的同时带动与主动齿轮啮合的四个从动齿轮转动，四个从动齿轮分别带动四根副钻杆旋转；空心主钻杆通过定位板带动齿轮传动箱同步轴向移动，齿轮传动箱带动四根副钻杆同步轴向移动。
所述密封端盖用于限制副钻杆的径向位移且具有密封作用。
所述主动齿轮外径大于从动齿轮外径，齿轮传动箱的正方形外轮廓与主动齿轮外轮廓尺寸相配合，齿轮传动箱的四个圆形外轮廓与四个从动齿轮外轮廓尺寸相配合。
所述吸泥口呈椭圆形且与空心主钻杆内部的空心排泥管相连通；吸泥口不高于副钻头切削刃的上边界位置，不低于副钻头切削刃的下边界位置。
所述齿轮传动箱与空心主钻杆不直接接触，在钻孔过程中齿轮传动箱不随任何钻头转动。
所述主动齿轮和从动齿轮分别通过空心主钻杆和副钻杆的轴肩和套筒实现轴向定位。
所述主钻头及其切削刃的钻孔半径大于副钻头及其切削刃的钻孔半径，以此保证齿轮传动箱不与钻孔后形成的孔壁相干涉。
本发明的有益效果：
1)本发明通过将从齿轮传动应用于反循环钻机的钻头上，使其在桥梁中塔沉井施工过程中，利用齿轮间的传动为四个副钻头提供动力，在不需要增加额外动力源的前提下，使主钻头和副钻头同时对淤泥进行切削，一次钻孔可形成更大截面的深孔，成倍的提高了钻孔效率。
2)本发明各钻头切削刃之间由于旋转产生相对转动，可以增强对泥浆的搅拌作用，加快泥浆的混合与形成，提高钻孔效率和泥浆排出效率，避免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。
附图说明
图1为本发明的结构设计简图主视图；
图2为本发明的结构设计简图俯视图；
图3为本发明的主钻头与副钻头切削范围示意图。
图中：1、主钻头；2、刀齿；3、切削刃；4、副钻头；5、吸泥口；6、副钻杆；7、密封端盖；8、轴承Ⅱ；9、从动齿轮；10、齿轮传动箱；11、主动齿轮；12、密封圈；13、定位板；14、空心主钻杆；15、键；16、轴承Ⅰ。
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，本发明包括齿轮传动箱10、主动齿轮11、从动齿轮9、空心主钻杆14、副钻杆6、主钻头1和副钻头4；位于齿轮传动箱10上下端面处的空心主钻杆14外周面均固定连接有一块定位板13，每块定位板13与齿轮传动箱10之间均安装有轴承Ⅰ16，并通过密封圈12实现密封；空心主钻杆14通过齿轮传动箱10上下端面的轴承Ⅰ16与齿轮传动箱10连接；四个从动齿轮9所对应的齿轮传动箱10上下端面均固定有用于限制副钻杆6径向位移的密封端盖7，密封端盖7与齿轮传动箱10之间均安装有轴承Ⅱ8，并通过密封圈12实现密封，每根副钻杆6通过齿轮传动箱10上下端面的轴承Ⅱ8与齿轮传动箱10连接。
空心主钻杆14底部开有前后贯穿空心主钻杆14的吸泥口5；空心主钻杆14底端同轴固定有主钻头1，每根副钻杆6底端均同轴固定有副钻头4，主钻头1和副钻头4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，副钻头4底部位置高于主钻头1的切削刃3上边界位置。
如图2所示，齿轮传动箱10外轮廓主要由正方形和四个分别以正方形的四个顶点为圆心的圆形组成，主动齿轮11和四个从动齿轮9均位于齿轮传动箱10内部，主动齿轮11沿周向均布有四个从动齿轮9，每个从动齿轮9均与主动齿轮11相啮合，主动齿轮11位于齿轮传动箱10中正方形围成的箱体内，四个从动齿轮9分别位于齿轮传动箱10中四个圆形围成的箱体内。主动齿轮11中间通过键15连接有空心主钻杆14，每个从动齿轮9中间通过键15连接有副钻杆6，空心主钻杆14与每根副钻杆6均上下贯穿齿轮传动箱10。
如图3所示为本发明的主钻头与副钻头切削范围示意图，可以看到主钻头1和副钻头4同时对淤泥进行切削时，一次钻孔即可形成大截面的深孔，与原有钻头装置相比成倍地提高了钻孔效率。主钻头1及其切削刃3的钻孔半径大于副钻头4及其切削刃3的钻孔半径，以此保证齿轮传动箱10不与钻孔后形成的孔壁相干涉。
实施例：
在钻孔的过程中，主钻头1先钻入土体，四片切削刃3在主钻头1钻入土体之后继续对水底淤泥软土进行切削，空心主钻杆14带动主动齿轮11旋转，利用齿轮间的传动为四个副钻头4提供动力，从而在不增加动力源的前提下，使主钻头1和副钻头4同时对淤泥进行切削，大大增加了一次钻孔的成型范围，成倍的提高了钻孔效率；同时，主钻头1切削刃与副钻头4切削刃之间的相对转动，可以大大增强对泥浆的搅拌作用，使钻孔产生的淤泥与水更充分的混合形成泥浆，空心主钻杆14和钻孔之间快速旋转产生的负压，使泥浆吸入吸泥口5，泥浆通过空心排泥管快速排出，提高钻孔过程中的排泥效率。

Claims (7)

  1. 一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：包括齿轮传动箱(10)、主动齿轮(11)、从动齿轮(9)、空心主钻杆(14)、副钻杆(6)、主钻头(1)和副钻头(4)；
    齿轮传动箱(10)外轮廓主要由正方形和四个分别以正方形的四个顶点为圆心的圆形组成，主动齿轮(11)和四个从动齿轮(9)均位于齿轮传动箱(10)内部，主动齿轮(11)沿周向均布有四个从动齿轮(9)，每个从动齿轮(9)均与主动齿轮(11)相啮合，主动齿轮(11)位于齿轮传动箱(10)中正方形围成的箱体内，四个从动齿轮(9)分别位于齿轮传动箱(10)中四个圆形围成的箱体内；
    主动齿轮(11)中间通过键(15)连接有空心主钻杆(14)，每个从动齿轮(9)中间通过键(15)连接有副钻杆(6)，空心主钻杆(14)与每根副钻杆(6)均上下贯穿齿轮传动箱(10)；位于齿轮传动箱(10)上下端面处的空心主钻杆(14)外周面均固定连接有一块定位板(13)，每块定位板(13)与齿轮传动箱(10)之间均安装有轴承Ⅰ(16)，并通过密封圈(12)实现密封；空心主钻杆(14)通过齿轮传动箱(10)上下端面的轴承Ⅰ(16)与齿轮传动箱(10)连接；四个从动齿轮(9)所对应的齿轮传动箱(10)上下端面均固定有用于限制副钻杆(6)径向位移的密封端盖(7)，密封端盖(7)与齿轮传动箱(10)之间均安装有轴承Ⅱ(8)，并通过密封圈(12)实现密封，每根副钻杆(6)通过齿轮传动箱(10)上下端面的轴承Ⅱ(8)与齿轮传动箱(10)连接；
    空心主钻杆(14)底部开有前后贯穿空心主钻杆(14)的吸泥口(5)；空心主钻杆(14)底端同轴固定有主钻头(1)，每根副钻杆(6)底端均同轴固定有副钻头(4)，主钻头(1)和副钻头(4)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)，副钻头(4)底部位置高于主钻头(1)的切削刃(3)上边界位置。
  2. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：空心主钻杆(14)带动主动齿轮(11)转动的同时带动与主动齿轮(11)啮合的四个从动齿轮(9)转动，四个从动齿轮(9)分别带动四根副钻杆(6)旋转；空心主钻杆(14)通过定位板(13)带动齿轮传动箱(10)同步轴向移动，齿轮传动箱(10)带动四根副钻杆(6)同步轴向移动。
  3. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：所述密封端盖(7)用于限制副钻杆(6)的径向位移且具有密封作用。
  4. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：主动齿轮(11)外径大于从动齿轮(9)外径，齿轮传动箱(10)的正方形外轮廓与主动齿轮(11)外轮廓尺寸相配合，齿轮传动箱(10)的四个圆形外轮廓与四个从动齿轮(9)外轮廓尺寸相配合。
  5. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：所述吸泥口(5)呈椭圆形且与空心主钻杆(14)内部的空心排泥管相连通；吸泥口(5)不高于副钻头(4)切削刃(3)的上边界位置，不低于副钻头(4)切削刃(3)的下边界位置。
  6. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：齿轮传动箱(10)与空心主钻杆(14)不直接接触，在钻孔过程中齿轮传动箱(10)不随任何钻头转动。
  7. 根据权利要求1所述的一种钻搅结合的大截面沉井高效旋挖钻头装置，其特征在于：所述主钻头(1)及其切削刃(3)的钻孔半径大于副钻头(4)及其切削刃(3)的钻孔半径。
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