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Opposite-pulling anchor cable structure for reducing unsymmetrical loading and construction method
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A technology of anchor cables and loads, which is applied in basic structure engineering, earthwork drilling, installation of anchor rods, etc., can solve the problems of large number of sewage workers, high cost, and influence on construction progress, and achieves low economic cost, simple construction method, and reduced cost. Effect of Small Bias Loads
Pending Publication Date: 2019-09-20
山东省地质矿产勘查开发局八0一水文地质工程地质大队
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For example, anti-sliding piles have the advantage of high anti-sliding ability, but the number of sewage workers is large and the cost is relatively high, which affects the construction progress
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Embodiment 1
[0047] figure 1 It shows the anti-tension anchor cable structure for reducing tunnel bias load of the present invention, which includes: steel pipe piles 1, which are respectively arranged along the tunnel 100 and apply bias to the tunnel 100. In the mountains on both sides of the pressure load, the steel pipepile 1 is used to reinforce the rock mass of the mountains on both sides along the line before excavation; and the crown beam 2 is arranged on the ground, and the top of the steel pipepile 1 is fixed in the crown beam 2.
[0048] In this embodiment, parameters such as the diameter, spacing, length, and wall thickness of the steel pipe pile 1 can be determined according to influencing factors such as tunnel burial depth, surrounding rock conditions, groundwater state, and mountain stability, as long as it can ensure that the tunnel on one side of the mountain is stability of the rock mass. Here, the steel pipe pile 1 has a diameter of 50-1000mm (preferably 200-800mm, m...
Embodiment 2
[0070] Such as Figure 10 As shown, the present invention also provides a construction method for reducing the tunnel bias load on the basis of the first embodiment above, which includes the following steps:
[0071] S1, prefabricated steel pipe pile 1;
[0072] S2. Install the steel pipe pile 1 in the mountain body on both sides of the tunnel 100; and perform grouting reinforcement on the surrounding rock mass of the steel pipe pile 1 .
[0073] Specifically, step S2 includes:
[0074] S21, such as Figure 11 As shown, a crown beam 2 is set on the ground, and the top of the steel pipe pile 1 is fixed in the crown beam 2. At the same time, a borehole 308 can also be drilled in advance, and the steel pipe 10 of the steel pipe pile 1 The bottom extends into the pre-drilled borehole, so that the steel pipe pile 1 is arranged in the mountain body on both sides of the tunnel 100;
[0075] S22, the first grouting: pump a small amount of clear water to the bottom of the borehole ...
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Abstract
The invention discloses an opposite-pulling anchor cable structure for reducing unsymmetrical loading. The opposite-pulling anchor cable structure for reducing unsymmetrical loading comprises steel tube piles separately arranged in mountain bodies on the two sides of a tunnel and a crown beam arranged on the ground, wherein the steel tube piles are used for reinforcing rock bodies of the mountain bodies on the two sides along the line; and the tops of the steel tube piles are fixed into the crown beam. A construction method comprises the steps that the steel tube piles arranged in one sides of the mountain bodies along the line of the unsymmetrical loading tunnel are prefabricated, and the steel tube piles are used for reinforcing the rock bodies on the one sides of the mountain bodies. According to the opposite-pulling anchor cable structure for reducing the unsymmetrical loading and the construction method, the unsymmetrical loading subjected by the unsymmetrical loading tunnel is reduced through the micro steel tube piles, and the situations of disease and unstability of a tunnel structure due to the fact that the tunnel is in a serious unsymmetrical loading state are avoided.
Description
technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a double-tensioned anchor cable structure and a construction method for reducing bias loads. Background technique [0002] Unbiased tunnel refers to the tunnel where the surrounding rock pressure on both sides of the tunnel support structure is quite different or the load is asymmetrical. For example, the section of a highway tunnel is generally horseshoe-shaped. Due to factors such as terrainasymmetry, geological rock formations, and construction, the loads on both sides of the tunnel structure are asymmetrical, forming a bias. The effect of bias is one of the main reasons for tunnel deformation and collapse. Therefore, when the tunnel is under severe bias, measures should be taken to prevent the tunnel structure from being damaged or unstable. The main defects during the construction period are that the pressure on the biased side is high, which is prone to large defor...
Claims
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