Underwater stone throwing and grouting reinforcing method for hanging soft foundation at lower part of immersed tube

Abstract

The invention discloses an underwater stone throwing and grouting reinforcing method for a hanging soft foundation at the lower part of an immersed tube. The method comprises the following steps: first, finding out the position of a pipeline, and excavating a water channel; throwing stone to the water channel, thus forming a stone-throwing silt squeezing layer; pre-burying a plurality of groutingpipelines at the position, close to the bottom, of the stone-throwing silt squeezing layer; then still throwing stone to the water channel, thus forming a stone-piled layer; then carrying out backfilling on the part around the pipeline by adopting stone chips till the water channel is level, thus forming a buffer layer; then covering the surface of the buffer layer with seepage-proofing geotechnical cloth, and carrying out backfilling on the seepage-proofing geotechnical cloth with gravel; then carrying out grouting and mud pumping simultaneously, thus forming a compact stone piled concrete structure; and finally, carrying out road pavement construction through layered paving and pressing according to the roadbed reequipments of road design. With the technical scheme, the purpose that whenthe waterway after construction adopting the immersed tube method encounters the construction road, the reinforcing for the foundation of the hanging part at the lower part of the immersed tube achieves the design bearing capacity requirements of the road is achieved, the method is simple and feasible, and the construction cost is low.

Description

technical field [0001] The invention belongs to the technical field of pipeline construction, and in particular relates to an underwater riprap grouting reinforcement method for a suspended soft foundation under an immersed pipe. Background technique [0002] In the construction of municipal road projects, it is often encountered that the ditch with the immersed pipe method is passed down. When the immersed pipe is placed, the cushion layer at the bottom of the tank is not smooth, causing the pipe to not sink evenly at the bottom of the underwater tank. Therefore, a thick layer of silt will be deposited between the cushion and the pipeline. When the road construction encounters ditches, the construction method of riprapping and silting is usually adopted, that is, the cofferdam is pumped first, and then the rubble is thrown and filled to squeeze the silt, and the layers are rolled and compacted. However, due to the support of the pier and the suspended pipeline in the middl...

AI Technical Summary

Problems solved by technology

However, some pipelines cannot be stopped due to production needs, and some pipelines are pressurized or siphon-type pipelines, which cannot be cut off and diverted at all.

[0003] Some design units will design a small box culvert or a small bridge to cross the above situation. Although it can solve the road design problem, it is undoubtedly necessary to add a box culvert or bridge project. The construction of the substructure also requires cofferdam method drainage, steel plate Enclosure and pile foundation bearing capacity, the construction process is complicated, the construction period is long, and because the river bank is a geological structure layer with strong permeability such as silt sand, it will cause the problem that the pumping cannot be completely done, and the entire project cost is very high

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