Water-rich sand layer large-diameter pipe jacking group in-out hole reinforcing structure and construction method
A water-rich sand layer and reinforcement structure technology, applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of high construction cost, difficult construction, and difficulty in pile formation by freezing method, and achieve the goal of construction difficulty and construction cost The effect of reducing and improving reinforcement efficiency and improving quality
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Embodiment 1
[0031] The reinforcement structure of the large-diameter pipe jacking group access hole in the water-rich sand layer of the present invention includes an underground diaphragm wall and a high-pressure jet grouting pile. The thickness of the wall is 0.8m, and the depth of the underground diaphragm wall is 10m below the elevation of the bottom of the pipe jacking machine, so as to effectively form a water-stop curtain. The relative underground diaphragm wall is supported by cross braces.
[0032] Preferably, a row of two C30 cast-in-place bored piles with a diameter of 0.6m are arranged in the middle of the originating well and the receiving well, and the bored cast-in-place piles are at the same depth as the underground diaphragm wall, both The bottom elevation of the pipe jacking machine is 10m below, and the cross brace is fixedly connected to the bored pile, so that the cross brace in the support well is reinforced by the bored pile.
[0033] The high-pressure rotary groutin...
Embodiment 2
[0037] Such as figure 1 as shown, figure 1 It is a structural view of the reinforcement structure of the large-diameter pipe jacking group in the water-rich sand layer; this embodiment is explained through actual cases;
[0038] Three pipe jacking machines are assembled in the originating shaft 9, respectively jacking from left to right by the first entrance 6, the second entrance 7, and the third entrance 8, and then by the first exit 61, the second The exit hole 71 and the third exit hole 81 reach the receiving well.
[0039] When the pipe jacking machine group takes out the starting shaft 9, it is called exiting the hole, and when the pipe jacking machine group enters the receiving shaft 10, it is called entering the hole, thus completing a cycle.
[0040] Such as figure 2 as shown, figure 2 It is a structural view of the originating shaft; the reinforced structure of the water-rich sand layer large-diameter pipe jacking group entry and exit holes of the present inven...
Embodiment 3
[0051] Such as Figure 4 as shown, Figure 4 It is the reinforcement structure diagram of the pipe jacking entrance and exit hole, the opening 12 is provided with a water stop ring, and the opening 12 is the opening of the entrance and exit hole of the pipe jacking group, and the water stop ring is embedded in the lining structure 13 and the surrounding A protective structure 14, the enclosure structure 14 is an underground diaphragm wall, and the inner lining structure 13 is a concrete reinforcement structure extending from the underground diaphragm wall to the working well. The reinforced soil 17 in the figure can be the high-pressure jet grouting pile 5 .
[0052] The water stop ring includes a pre-embedded steel ring 15, a pressure plate 19, a rubber ring 20 and an installation steel ring 18, and the pressure plate 19 and the rubber ring 20 are arranged between the embedded steel ring 15 and the installation steel ring 18 Between, when setting up the enclosure structure ...
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