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Stratum reinforcement PSC construction method

A construction method and stratum technology, applied in the field of stratum reinforcement PSC construction, can solve the problems that the overall strength has not been substantially improved, and the soil layer has not been improved, so as to achieve good slurry permeability, flexible hole positions for equipment movement, and improve compressive strength Effect

Active Publication Date: 2015-07-15
广东欣龙隧道装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this construction method is only grouting after opening holes on the ground, without improving the soil layer, and the overall strength after construction has not been substantially improved. This construction method cannot meet the increasingly higher construction requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] After the ratio is determined, the formation drainage construction is carried out, and the tunnel drilling machine is used for drilling again. The diameter of the hole formed by the drilling of the drill bit is not less than 40mm. The proportioned chemical slurry is injected into the hole; and the drilling operation in the formation drainage construction step is sequentially carried out from one side of the construction surface to the other side to complete the formation drainage.

[0056] After the formation drainage is completed, the formation reinforcement grouting is carried out. During the formation reinforcement grouting, the tunnel drilling machine needs to be moved to the hole where the formation drainage has been completed, and the drill bit is drilled into the hole again. When the drill bit reaches the bottom of the hole, use double-liquid grouting The hole-filling and reinforcement slurry supply pump of the pump injects the hole-filling and reinforcement slurr...

Embodiment 2

[0060] After the ratio is determined, the formation drainage construction is carried out, and the tunnel drilling machine is used for drilling again. The diameter of the hole formed by the drilling of the drill bit is not less than 40mm. The proportioned chemical slurry is injected into the hole; when the drill bit is lifted upwards, start the hole-filling and strengthening slurry of the double-liquid injection pump to start grouting. As the grouting parameters change, the lifting speed needs to be adjusted according to the grouting flow rate, the grouting amount and the grouting penetration radius. When the grouting amount or the grouting pressure reaches the design value, continue to lift the rod.

[0061] The grouting process needs to strictly control the grouting pressure, and pay close attention to the grouting amount at the same time. When the pressure rises instantaneously or the grout overflows from the hole wall or the cross-section sand layer, the grouting should be s...

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Abstract

The invention discloses a stratum reinforcement PSC construction method which comprises the following construction steps: lofting hole sites; performing first hole construction; determining slurry proportion; performing stratum drainage construction; performing stratum reinforcement grouting; repeating the previous steps, thereby finishing all the stratum reinforcement PSC construction steps. The stratum reinforcement PSC construction method has the beneficial effects that equipment used in the stratum reinforcement method is relatively small in size and flexible in movement among hole sites; the slurry consolidation time can be regulated according to practical situations; the slurry penetrability is favorable; the slurry can be consolidated under the condition of circulating water, is difficult to dissolve and good in water stop effect; the reinforcement method is applicable to various strata, wide in application range, good in environment-friendly functional effect, less in environment pollution, good in safe operation function and high in construction speed; by virtue of adopting the technology for construction, the construction process includes advancing-type construction and backing-type construction, additional hole guiding is not needed, the additional hole guiding time is saved, and hole collapse is avoided; the preparation of construction is simple, around-the-clock construction can be performed and the engineering cost is low.

Description

technical field [0001] The invention relates to the field of stratum reinforcement construction, in particular to a stratum reinforcement PSC construction method. Background technique [0002] Domestic tunnel shield construction ends and building ground reinforcement methods are mainly improved, replaced, extruded and other main reinforcement methods. In the prior art, the purpose of stratum reinforcement is achieved through grouting with rotary grouting piles and sleeve valve pipes. For the water-rich gravel stratum, there is no safe, economical, efficient and mature stratum treatment construction method in the existing reinforcement methods. [0003] There is currently one prior art related to the invention in China. The applicants are China Railway Second Bureau Co., Ltd. and China Railway Second Bureau First Engineering Co., Ltd., and the patent application number is 201110064110.0. The invention patent "construction method for foundation reinforcement in soft soil area...

Claims

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Application Information

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IPC IPC(8): E02D1/00E02D3/12
CPCE02D1/00E02D3/12E02D2250/003E02D2300/0018
Inventor 刘建郑杨锐刘军谢远云梁远波魏建滨
Owner 广东欣龙隧道装备股份有限公司
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