A Synchronous Follow-Up Construction Method of Steel Pipe Sheets Suitable for Shaft Excavation

Abstract

The invention provides a synchronous follow-up construction method of steel pipe sheets suitable for shaft excavation, including: designing the lock structure of the construction position and performing lock construction; using excavation equipment to dig the depth of a layer of steel pipe sheets; forming the first layer of After at least two steel pipe sheets of the steel pipe ring are hoisted to the predetermined position of the excavation equipment, the weld seams between adjacent steel pipe sheets are welded to form a steel pipe ring, and the gap between the steel pipe sheets and the shield body is welded to make the first layer The steel pipe ring is fixed on the shield body; the steel pipe sheets are welded and assembled until the excavation equipment is excavated until completion; the shield body is reserved and the excavation equipment is withdrawn, and the shaft shaft structure is obtained by pouring. Applying the construction method of the present invention, the steel pipe sheet is used to follow up the construction of the shaft excavation synchronously, and the support effect can be quickly formed on the well wall in soft ground or rock formation, and the overall welding strength of the steel pipe sheet is high, which is suitable for various strata. Excavation, with the adaptability of soft soil / rock excavation construction.

Description

technical field [0001] The invention relates to the technical field of shaft construction, in particular to a synchronous follow-up construction method for steel pipe sheets suitable for shaft excavation. Background technique [0002] The shaft is the shortest passage connecting the ground to the underground space, and it is an important underground engineering facility, which is widely used in many fields such as hydraulic power, mining, municipal administration, and national defense. [0003] Existing shaft construction technologies include drill and blast method, drilling rig method, raised shaft method, reaming method, etc. The advantages and disadvantages of the technologies are analyzed as follows: [0004] Drilling and blasting method: The drilling and blasting method is a commonly used shaft construction method at present. The drilling equipment is used to drill holes on the excavation surface of the shaft, and then explosives are installed in the holes for blasting....

AI Technical Summary

Problems solved by technology

[0009] Support link: when using segments for support in the prior art, prefabricated concrete segments or prefabricated steel pipe segments are generally used, and the segments are connected by bolts, which causes the shaft segments to The bearing capacity of the direction is low, and the overall strength of the wellbore is limited after forming, which cannot meet the high-strength shaft construction requirements

At the same time, there are gaps between the segments, and there is a risk of seal leakage in the later stage

Using welding method as the segment connection method can improve the overall strength of the wellbore and improve the leakage prevention ability, but it takes a lot of time to use the welding method between the segments, and the welding operation needs to be carried out in the underground environment, which is extremely difficult

[0010] Pouring link: The drill and blast method usually uses the synovial film pouring method to pour the shaft wall in sections. After the overall excavation of the shaft is completed, the formwork system is lowered, and the concrete is poured between the formwork and the well wall to complete the layer-by-layer and segmented pouring. Therefore, it cannot be poured at one time. It takes a long time to complete the overall pouring; the drilling rig method needs to assemble the segments ring by ring from the bottom and arrange the water-resistant layer after the excavation construction is completed. After the assembly is completed, spray mix between the cave wall and the segment. Complicated; the raised well method and the reaming method have requirements on the construction geology, and generally require better construction geological conditions. At present, there are few construction cases in China

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