WO2015135359A1 - 盾构刀盘不同安装半径处刀具数量的确定方法 - Google Patents

盾构刀盘不同安装半径处刀具数量的确定方法 Download PDF

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Publication number
WO2015135359A1
WO2015135359A1 PCT/CN2014/094660 CN2014094660W WO2015135359A1 WO 2015135359 A1 WO2015135359 A1 WO 2015135359A1 CN 2014094660 W CN2014094660 W CN 2014094660W WO 2015135359 A1 WO2015135359 A1 WO 2015135359A1
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Prior art keywords
tools
cutter head
radius
radii
cutters
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English (en)
French (fr)
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张茜
亢一澜
侯振德
蔡宗熙
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Tianjin University
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Tianjin University
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield

Definitions

  • the invention belongs to the shield mechanical technology, and particularly relates to a method for determining the number of tools at different mounting radii of the shield cutter.
  • Shield is a typical excavation equipment in underground engineering and has been widely used in various tunnel construction projects.
  • the cutter head is at the forefront of the equipment.
  • the cutter head and the cutter are like the human "tooth bed” and "teeth", which are the core components of the tunneling equipment.
  • the current shield cutterheads are, in principle, the same number of cutters that have different cutter ring mounting radii, ie the number of cutters per revolution is equal.
  • the cutting trajectory is not equal (generally the closer to the edge of the cutter head, the greater the load, of course, the trajectory of the cutter is also Relatively longer).
  • the present invention provides a method for scientifically determining the number of tools in a shield cutter head, which can take into account the force characteristics at different positions of the cutter head and the difference in the cutting path of the cutter, so that the service life of the cutter at different positions of the cutter head is as close as possible to Reduce the number of tool changes and reduce production costs.
  • the object of the invention is to propose a method for determining the number of tools at different mounting radii of the shield cutterhead, and provide a scientific and effective reference for the shield equipment design.
  • the method for determining the number of tools at different mounting radii of the shield cutter includes five steps:
  • the cutter head is first divided into two regions, and then the number of tools required for each installation radius in the two regions is determined: if the tool installation radius satisfies the region Divide into area 1 if the tool mounting radius meets the area Divided into zone 2, where r 1 and r 2 represent the respective mounting radii of the tool in zone 1 and zone 2, respectively, and R is the radius of the cutterhead;
  • E is the elastic modulus of the soil
  • ⁇ is the Poisson's ratio of the soil
  • ⁇ is the driving footage
  • ⁇ s is the stress limit of the soil
  • n s is the number of tools at the edge of the cutter head
  • the calculation formulas of the installation radii in the area 1 are the same.
  • the calculation formulas of the installation radii in the area 2 are the same.
  • the installation radius in the formula is a variable. When calculating, the installation radius value is first determined, and then the condition area that is satisfied according to the radius is brought into the corresponding zone 1 or zone 2. Then use the corresponding calculation formula to determine.
  • the features of the present invention and the positive effects produced are that the number of tools at different mounting radii of the shield cutter disc is determined in consideration of the force characteristics of the cutter at different positions on the cutter head and the difference in the trajectory of the cutter cutter, so that the cutters at different positions of the cutter cutter are at different positions.
  • the service life is as close as possible, effectively reducing the number of tool changes and reducing the production cost, and providing a scientific calculation basis for the optimal design of the shield cutterhead.
  • the method for determining the number of tools at different mounting radii of the shield cutter is divided into the following five steps:
  • the cutter head is first divided into two regions, and then the number of tools required for each installation radius in the two regions is determined: if the tool installation radius satisfies the region Divide into area 1 if the tool mounting radius meets the area Divided into zone 2, where r 1 and r 2 represent the respective mounting radii of the tool in zone 1 and zone 2, respectively, and R is the radius of the cutterhead;
  • E is the elastic modulus of the soil
  • ⁇ is the Poisson's ratio of the soil
  • ⁇ is the driving footage
  • ⁇ s is the stress limit of the soil
  • n s is the number of tools at the edge of the cutter head
  • the number of tools at the remaining mounting radius on the cutter head can be determined in the same way. This gives the number of tools at different mounting radii on the entire shield cutterhead.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

一种盾构刀盘不同安装半径处刀具数量的确定方法，包括：将刀盘划分为两个区域；分别计算区域1和2内各条安装半径处的推进应力σ 1和σ 2；确定区域1和2内各条安装半径处的刀具数量n 1和n 2。该方法能使刀盘的不同位置处刀具的使用寿命接近，减少换刀次数，降低生产成本。

Description

盾构刀盘不同安装半径处刀具数量的确定方法 技术领域
本发明属于盾构机械技术，具体涉及一种盾构刀盘不同安装半径处刀具数量的确定方法。
背景技术
盾构是地下工程中的典型掘进装备，目前已被广泛应用于各类隧道工程建设中。刀盘位于装备最前方。在盾构机中，刀盘以及刀具如同是人的“牙床”和“牙齿”，属于掘进装备的核心部件。目前的盾构刀盘，原则上是刀盘安装半径不同而设置的刀具数量相同，即不同半径每一圈刀具的数量相等。然而，由于刀盘上不同区域所受的载荷并不均匀，而且刀具处在不同的刀盘位置，其切削轨迹也不相等(一般越靠近刀盘边缘处载荷越大，当然刀具切削的轨迹也相对越长)。如果按目前的设计方法，在不同半径上设置相同数量的刀具，则靠近刀盘外缘处的刀具首先会先被损坏。如果根据刀盘上不同的半径设置不同数量的刀盘，那么其设计的依据在哪里？由于盾构掘进属于地下封闭施工，开仓换刀十分困难且成本昂贵。因此，本发明提出一种盾构刀盘科学确定刀具数量的方法，能考虑到刀盘不同位置处的受力特征以及刀具切削轨迹差异，使刀盘不同位置处刀具的使用寿命尽量接近，以减少换刀次数，降低生产成本。
发明内容
本发明的目的是，提出一种盾构刀盘不同安装半径处刀具数量的确定方法，为盾构装备设计提供科学有效的参考依据。
盾构刀盘不同安装半径处刀具数量的确定方法，包括五个步骤：
(1)根据受力特征，首先将刀盘划分为两个区域，然后分别确定这两个区域内每一条安装半径上所需的刀具数量：如果刀具安装半径满足区域
Figure PCTCN2014094660-appb-000001
划入区域1，如果刀具安装半径满足区域
Figure PCTCN2014094660-appb-000002
划入区域2，其中r1和r2分别代表区域1和区域2内刀具的各条安装半径，R为刀盘半径；
(2)计算区域1内的推进应力σ1：
Figure PCTCN2014094660-appb-000003
式中：E为土体弹性模量，μ为土体泊松比，δ为掘进进尺，σs为土体的应力极限；
(3)确定区域1内的刀具数量n1：
Figure PCTCN2014094660-appb-000004
式中：ns为刀盘边缘处的刀具数量；
(4)计算区域2内的推进应力σ2：
Figure PCTCN2014094660-appb-000005
(5)确定区域2内的刀具数量n2：
Figure PCTCN2014094660-appb-000006
由此可给出盾构刀盘两个区域内各条安装半径上所需刀具的具体数量。
每个刀盘上有若干条刀具的安装半径，位于区域1内的各条安装半径的计算公式相同，同理位于区域2内的各条安装半径的计算公式相同。公式中的安装半径是个变量，计算时首先确定出安装半径值，然后根据该半径满足的条件区域，就带入相应的1区或2区。然后采用相应的计算公式确定。
本发明的特点以及产生的积极效果是，考虑刀盘上不同位置处刀具的受力特征以及掘进轨迹的差异，确定盾构刀盘不同安装半径处的刀具数量，使刀盘不同位置处刀具的使用寿命尽量接近，有效减少换刀次数，降低生产成本，为盾构刀盘的优化设计提供了科学计算依据。
具体实施方式
以下通过具体实施例对本发明的方法作进一步的说明，需要说明的是本实施例是叙述性的，而不是限定性的，不以此限定本发明的保护范围。
盾构刀盘不同安装半径处刀具数量的确定方法，分为以下五个步骤：
(1)根据受力特征，首先将刀盘划分为两个区域，然后分别确定这两个区域内每一条安装半径上所需的刀具数量：如果刀具安装半径满足区域
Figure PCTCN2014094660-appb-000007
划入区域1，如果刀具安装半径满足区域
Figure PCTCN2014094660-appb-000008
划入区域2，其中r1和r2分别代表区域1和区域2内刀具的各条安装半径，R为刀盘半径；
(2)计算区域1内的推进应力σ1：
Figure PCTCN2014094660-appb-000009
式中：E为土体弹性模量，μ为土体泊松比，δ为掘进进尺，σs为土体的应力极限；
(3)确定区域1内的刀具数量n1：
Figure PCTCN2014094660-appb-000010
式中：ns为刀盘边缘处的刀具数量；
(4)计算区域2内的推进应力σ2：
Figure PCTCN2014094660-appb-000011
(5)确定区域2内的刀具数量n2：
Figure PCTCN2014094660-appb-000012
由此可给出盾构刀盘两个区域内各条安装半径上所需刀具的具体数量。
实施例：该地铁工程所使用的盾构刀盘半径R＝3.3m，边缘刀具数ns＝20；地质参数取自工程地质报告，包括土体弹性模量E＝5.6MPa，土体泊松比μ＝0.29，土体应力极限σs＝46kPa；预设的掘进进尺δ＝0.03m/rev。
以确定并计算刀盘上两条安装半径处刀具的数量为例(两条安装半径分别为r1＝1.0m处和r2＝2.4m处)，给出具体步骤，其它各安装半径处的刀具布置数量均可按照相同的方法确定。
(1)首先判断要计算的两条安装半径(r1＝1.0m和r2＝2.4m)位于哪个区域：由于
Figure PCTCN2014094660-appb-000013
因此r1＝1.0m位于区域1，r2＝2.4m位于区域2；
(2)计算安装半径r1＝1.0m处(位于区域1内)的推进应力σ1：
由
Figure PCTCN2014094660-appb-000014
得到σ1＝24.0kPa
(3)确定安装半径r1＝1.0m处(位于区域1内)的刀具数量n1：
由
Figure PCTCN2014094660-appb-000015
得到n1＝3
(4)计算安装半径r2＝2.4m处(位于区域2内)的推进应力σ2：
由
Figure PCTCN2014094660-appb-000016
得到σ2＝37.0kPa
(5)确定安装半径r2＝2.4m处(位于区域2内)的刀具数量n2：
由
Figure PCTCN2014094660-appb-000017
得到n2＝12
至此，已确定出该刀盘上安装半径r1＝1.0m和r2＝2.4m处的刀具数量。
刀盘上其余各条安装半径处的刀具数量均可按照相同方法确定。由此可给出整个盾构刀盘上不同安装半径处的刀具数量。

Claims (1)

  1. 盾构刀盘不同安装半径处刀具数量的确定方法，其特征是所述方法分为以下五个步骤：
    (1)根据受力特征，首先将刀盘划分为两个区域，然后分别确定这两个区域内每一条安装半径上所需的刀具数量：如果刀具安装半径满足区域
    Figure PCTCN2014094660-appb-100001
    划入区域1，如果刀具安装半径满足区域
    Figure PCTCN2014094660-appb-100002
    划入区域2，其中r1和r2分别代表区域1和区域2内刀具的各条安装半径，R为刀盘半径；
    (2)计算区域1内的推进应力σ1：
    Figure PCTCN2014094660-appb-100003
    式中：E为土体弹性模量，μ为土体泊松比，δ为掘进进尺，σs为土体的应力极限；
    (3)确定区域1内的刀具数量n1：
    Figure PCTCN2014094660-appb-100004
    式中：ns为刀盘边缘处的刀具数量；
    (4)计算区域2内的推进应力σ2：
    Figure PCTCN2014094660-appb-100005
    (5)确定区域2内的刀具数量n2：
    Figure PCTCN2014094660-appb-100006
    由此可给出盾构刀盘两个区域内各条安装半径上所需刀具的具体数量。
PCT/CN2014/094660 2014-03-10 2014-12-23 盾构刀盘不同安装半径处刀具数量的确定方法 Ceased WO2015135359A1 (zh)

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