Shield declination originating technology
A shield and technical technology, applied in mining equipment, earth-moving drilling, tunnels, etc., can solve the problem that the shield cannot start straight or curved, and achieve the effects of reasonable design, easy deviation correction, and reliable safety and quality.
Active Publication Date: 2014-04-23
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology
[0005] In order to solve the problem that the existing shield machine cannot perform straight-line or curved launch when encountering special circumstances, the present invention provides a deflection-angle launch technology for shield tunneling
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[0013] A shield deflection starting technology. When the shield 5 is starting, the shield axis 3 and the design center line 4 are kept at a certain angle θ to start, and the initial offset a is set, and a≤50mm. After fully entering the soil, correct the deflection to adjust the posture of the shield axis. On the premise of determining the initial offset a, make the actual offset b≤50mm through deflection correction. When the design line is straight, the shield axis returns to the design Center line; when the design line is curved, make the axis of the shield machine consistent with the tangent direction of the design line and close to the design center line.
[0014] The deflection angle of the shield machine is divided into two situations, figure 1 Shown is the declination angle starting schematic diagram of the design line as a straight line, figure 2 Shown is the declination starting schematic diagram of the design line as a curve. In the figure, L1 is a straight line seg...
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The invention relates to the field of shield originating, in particular to a shield declination originating technology, and solves the problem that the existing shield can not perform straight-line or curve originating under special conditions. The technology comprises the following steps of: originating while keeping a certain angle theta between the shield axis and the design center line, and setting an initial offset a, wherein a<=50mm; after the shield host completely enters the soil body, correcting the deviation and adjusting the posture of the shield axis; and with the determined initial offset a, correcting the deviation so that the actual offset b is less than or equal to 50mm, wherein if the design line is a straight line, the shield axis returns to the design center line; and if the design line is a curve, the shield axis is consistent with the tangential direction of the design line and is close to the design center line. The technology provided by the invention not only can realize safe and smooth originating of the shield under special conditions, but also prevents overrun of the tunnel deviation; moreover, the technology is safe and practical and reasonable in design, and can realize safe originating of the shield under abnormal conditions and change the curve originating of the shield into straight-line originating under difficult conditions; and the technology is easy to correct deviation and guarantee line precision, and is safe and reliable in quality.
Description
technical field [0001] The invention relates to the field of shield tunneling, in particular to a shield tunneling deflection angle firing technology when the shield cannot meet the normal firing state. Background technique [0002] With the rapid development of urban subways, shield equipment has been more and more widely used in the construction of tunnels in urban subway intervals. Adopting the correct starting method is one of the key links in shield tunneling construction. [0003] Shield starting is divided into two basic methods: straight line starting and curved starting. The origin of the curve requires opening the shield tail hinge, which requires strict thrust control and is difficult to locate accurately, so it is generally avoided as much as possible. Straight line starting is relatively easy to control, so try to use straight line starting in construction. [0004] However, not all shield machines can start in a normal straight line. In special cases, such as...
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IPC IPC(8): E21D9/093
Inventor 贾大鹏张丽芳张勇张晓陈俊
Owner CHINA RAILWAY 12TH BUREAU GRP