Underground pipeline protection device and support method applying underground pipeline protection device

Abstract

The invention discloses an underground pipeline protection device and a support method applying the underground pipeline protection device. The device is formed by mutually buckling a plurality of pieces of channel steel, and the directions of adjacent channel steel openings are opposite; grouting steel tubes are welded in the channel steel; grouting holes are formed in the walls of the grouting steel tubes. The underground pipeline protection device has the beneficial effects that channel steel which is tightly buckled and closely lined in forward and reverse directions is horizontally deployed below a pipeline; the grouting steel tubes are welded in the slots of the channel steel; the soil is consolidated and gaps between the channel steel can be compacted through the grouting of the grouting steel tubes, so as to effectively isolate the pipeline from the vault of a tunnel and prevent the phenomena of pipeline damage, tunnel gushing and the like due to the collapse and sinking of soil on the vault, so that the safety factor is high; in addition, according to the support method, no special robot is needed for construction, a worker only needs to set the channel steel and grout, a construction method is simple, the reinforcing effect is significant, and the time of the worker is saved.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to an underground pipeline protection device and a support method using the device. Background technique [0002] In the construction of urban underground projects, shallow buried tunnels and passing through buildings have always been one of the major and difficult points of engineering safety technical risks. Under adverse conditions such as municipal rain, sewage main pipes and other unfavorable conditions such as water and seepage pipelines, the construction risk is very high, and once a tunnel collapse accident occurs, it will cause pipeline collapse, tunnel irrigation, casualties, road collapse, traffic interruption, etc. The economic loss and social impact are extremely large, so it is designated as a special-grade, first-class engineering risk. In recent years, there have been many cases of pre-buried rainwater, sewage and other pipelines in shal...

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Problems solved by technology

[0003] At present, the existing underground pipeline protection measures mainly include: pipeline relocation and pipe water diversion, advance small conduit and large pipe shed grouting reinforcement, freezing method, horizontal jet grouting pile or mixing pile reinforcement, inserting plate method, etc. There is no uniform standard for the measures, and each has its own advantages and disadvantages in the actual construction process, such as pipeline relocation and pipe water diversion: if the pipeline is buried deep, it is very inconvenient when the pipeline is relocated, and the pipeline relocation The construction period of moving and diversion is long, which affects people's normal use; the grouting reinforcement of the small pipe and the large pipe shed is a conventional advance reinforcement measure, but when the ground is silt or silty clay, the grouting method is difficult to achieve water isolation As a result, the soil cannot be uniformly consolidated, and the low grouting pressure cannot achieve a sealing effect. If the pressure is high, it may flow into the pipeline, which will aggravate the damage of the pipeline and cannot guarantee construction safety.

In addition to the problem of grouting, the densely arranged large pipe shed is also limited by space, and the distance between the pipeline and the tunnel is small, making it difficult to construct. In addition, considering the construction time of the tunnel, it is difficult to implement due to the lack of conditions for laying a densely arranged pipe shed; Horizontal jet grouting piles and mixing piles are used for reinforcement. The horizontal reinforcement measures are mainly aimed at soil consolidation and are suitable for situations where the distance between pipelines and tunnels is relatively large. Due to the extremely small distance between projects in the construction of tunnels and subways, it is impossible to achieve the effect of reinforcement and isolation. At the same time, due to the construction If the pressure is high, the pipeline may be damaged in advance; for the freezing method: the freezing method is mainly suitable for the consolidation of the ground with a large water content, and the distance between the pipeline and the tunnel is large, even if it can be implemented, it may cause adverse effects on the pipeline. There are problems such as long construction period and extremely high cost; inserting plate method: the inserting plate method can effectively isolate the pipeline from the tunnel face, but the inconvenience of the inserting plate method is that the inserting plate needs to be customized, and special Plug-in machine, during the plug-in process, the plug-in board is easy to tilt, resulting in uneven isolation surface, which may cause pipeline rupture, and poor practicability

Therefore, it can be seen from the above that none of the existing methods can meet the needs of actual construction, nor can it guarantee the protection of underground pipelines during the construction process, the operation is cumbersome, and it is not practical.

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