Construction Method of Anchor Cable Drilling and Anti-slump Hole
A construction method and technology for preventing slumping holes, which can be used in excavation, infrastructure engineering, sheet pile walls, etc., can solve problems such as poor plasticity, inconvenience, and high soil moisture content, and achieve the effect of reasonable design of construction steps and simple operation.
Active Publication Date: 2016-01-27
MCC5 GROUP SHANGHAI CORPORATION LIMITED
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Problems solved by technology
In the drilling process of the known anchor cable drilling method, if the plasticity of the soil is poor and the moisture content of the soil is high, it is easy to produce hole collapse. will not be able to
[0003] Therefore there is above-mentioned inconvenience and problem in known anchor cable drilling method
Method used
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Embodiment 1
[0027] see now figure 1 , figure 1 It is a schematic diagram of the positional relationship between the core drill rod and the built-in drill rod according to the embodiment of the present invention. As shown in the figure, the inner drill rod 2 is arranged inside the core drill rod 1 .
[0028] Anchor cable drilling anti-collapse hole construction method of the present invention comprises the following steps:
[0029] a. Foundation pit excavation;
[0030] b. Slope floating soil cleaning, leveling and foundation pit slope setting;
[0031] c. Install conventional drilling machinery and equipment, and use the same drilling machine to carry out the drilling construction of the core drill bit and the built-in drill bit;
[0032] d. Drilling with a core bit, the core bit is hollow, and the drill rod of the core bit is also hollow, with a diameter of 100 mm and a length of 1.0 to 1.2 m;
[0033] e, adopt a built-in drill bit to drill holes, the built-in drill bit is a standar...
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The invention discloses an anti-collapse hole construction method for anchor drilling, which is characterized by comprising the following steps: a, carrying out earth excavation on a foundation pit; b, carrying out topsoil cleaning and flattening on a side slope and carrying out setting-out on the side slope of the foundation pit; c, installing a drilling machine; d, drilling holes by using a section of coring bit, wherein the coring bit and a drill stem thereof are hollow, the diameter of the drill stem is 90-120 mm, and the length of the drill stem is 1.0-1.2 m; e, drilling holes by using a section of internally-installed bit arranged in the coring bit, wherein the internally-installed bit is a solid bit, and a drill stem thereof is hollow, and the diameter of the drill stem of the internally-installed bit is 5-8 mm shorter than the diameter of the drill stem of the coring bit, and the length of the drill stem of the internally-installed bit is 1.0-1.2 m; f, alternately repeating the steps d and e; g, cleaning the holes, and completely withdrawing the drill stem of the internally-installed bit; h, installing an anchor and a grouting tube; i, grouting and withdrawing the drill stem of the coring bit, wherein grouting is performed while the drill stem of the coring bit is withdrawn, and after each section of the drill stem of the coring bit is withdrawn, pressure filling and grouting are performed once; and j, completely withdrawing the drill stem of the coring bit, and carrying out pressure filling and grouting once.
Description
technical field [0001] The invention relates to a construction method for underground foundation pit side slope support in construction engineering, in particular to a construction method for anchor cable drilling anti-collapse holes. Background technique [0002] In the deep excavation foundation pit support engineering, slope anchoring is a difficult process in construction technology. The anchor cable of the foundation pit slope is a measure to increase the anti-sliding friction resistance of the foundation pit slope and make the soil of the foundation pit slope reach a certain stability coefficient. In the technological process of anchor cable drilling, drilling is one of the key processes. In the drilling process of the known anchor cable drilling method, if the plasticity of the soil is poor and the moisture content of the soil is high, it is easy to produce hole collapse. cannot proceed. [0003] Therefore there are above-mentioned inconveniences and problems in th...
Claims
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IPC IPC(8): E02D17/02E02D5/74
Inventor 刘家铭
Owner MCC5 GROUP SHANGHAI CORPORATION LIMITED