Slag removal control method for long-distance rock pipe jacking construction
A control method, long-distance technology, applied in the direction of pipeline laying and maintenance, pipe/pipe joint/pipe fittings, mechanical equipment, etc., can solve the problem of reduced mud lubrication effect, increased pipe-rock friction coefficient, and increased contact pressure of pipe joints and other problems, to achieve good lubrication effect, prolong engineering time, and reduce frictional resistance.
Active Publication Date: 2022-04-19
CHONGQING UNIV
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Problems solved by technology
Slag removal can effectively improve the contact state of pipe and rock, and is an important measure to reduce frictional resistance and prevent pipe jamming in long-distance rock pipe jacking projects. Accurately judging the scope of bottom sediment is the prerequisite for slag removal work. Frequent slag removal will delay the construction period , and if the slag is not cleaned in time, it may cause the clogging of the bentonite grouting hole, the loss of the grout will increase the contact pressure of the pipe joint, and the reduction of the mud lubrication effect will lead to an increase in the friction coefficient of the pipe rock. A series of factors may lead to jamming Tube
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[0033] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.
[0034] Such as figure 1 The flow chart of the long-distance rock pipe jacking construction slag removal control method shown, the control method includes:
[0035] Step 1-1, determining the frictional resistance threshold per unit length of the pipe joint in long-distance rock pipe jacking construction;
[0036] Step 1-2, monitor the jacking force and head resistance of the pipe jacking machine, and determine the frictional resistance per unit length of the pipe joint according to the monitoring results;
[0037] Step 1-3, judging whether the frictional resistance per unit length of the pipe joint exceeds the fri...
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The invention provides a method for controlling slag removal in long-distance rock pipe jacking construction. Firstly, the friction resistance threshold per unit length of the pipe joint can be determined according to the distribution position of the grouting holes on the pipe joint during the long-distance rock pipe jacking construction. Then, the jacking force and head resistance are monitored in real time through the existing equipment of the pipe jacking machine, and the friction resistance per unit length of the pipe joint is determined according to the monitoring results. Finally, by comparing the friction resistance per unit length of the pipe joint and the friction resistance threshold per unit length, Determine whether it is necessary to clean the bottom of the pipe joint. If the friction resistance per unit length of the pipe joint exceeds the threshold value of the friction resistance per unit length, it indicates that the range of sediment at the bottom of the pipe joint exceeds the grouting hole and needs to be cleaned. Otherwise, it will not affect To achieve the grouting effect, no slag cleaning is required. In this way, it can effectively guide the project to remove slag and avoid blocking the grouting hole, so as to maintain a good lubrication effect, reduce frictional resistance, and effectively prevent pipe jamming. And there is no need to frequently clean the slag, avoiding prolonging the project time.
Description
technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for controlling slag removal in long-distance rock pipe jacking construction. Background technique [0002] In long-distance rock pipe jacking projects, bottom sediment is a problem that cannot be ignored, which affects the distribution of pipe-rock contact pressure and the buoyancy of slurry, thereby affecting the jacking force. Slag removal can effectively improve the contact state of pipe and rock, and is an important measure to reduce frictional resistance and prevent pipe jamming in long-distance rock pipe jacking projects. Accurately judging the scope of bottom sediment is the prerequisite for slag removal work. Frequent slag removal will delay the construction period , and if the slag is not cleaned in time, it may cause the clogging of the bentonite grouting hole, the loss of the grout will increase the contact pressure of the pipe joint, and the redu...
Claims
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IPC IPC(8): F16L1/028F16L1/06
CPCF16L1/028F16L1/06
Inventor 刘新荣邓志云杜立兵陈鹏韩亚峰周小涵梁宁慧钟祖良任联玺严如
Owner CHONGQING UNIV