Combined steel casing for rotary drilling of cast-in-place pile in backfilled soil and construction method thereof

A steel casing and combined technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of difficult processing, inconvenient transportation, heavy steel casing, etc., and achieve low production cost, reliable connection, splicing safe effect

Pending Publication Date: 2018-06-12
SHANGHAI CONSTR NO 5 GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the existing steel casing is difficult to process and inconvenient to transport due to its heavy weight, the present invention provides a combined steel casing for backfilling rotary-dug cast-in-situ piles, which is formed by splicing several steel casing units sequentially , on the steel casing unit on the upper and lower sides of the splicing seam, there are respectively provided with several upper connecting lugs and lower connecting lugs in pairs, and the upper connecting lugs and the lower connecting lugs are respectively provided with Connecting hole 1, connecting hole 2, connected by bolts

Method used

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  • Combined steel casing for rotary drilling of cast-in-place pile in backfilled soil and construction method thereof
  • Combined steel casing for rotary drilling of cast-in-place pile in backfilled soil and construction method thereof
  • Combined steel casing for rotary drilling of cast-in-place pile in backfilled soil and construction method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] see figure 1 with figure 2 As shown, the combined steel casing 100 for backfill rotary-dug cast-in-place piles provided in this embodiment includes two steel casing units 110, the two steel casing units 110 are spliced ​​up and down, and the steel casing above the splicing joint 111 The outer surface of the lower port of the casing unit 110 is provided with several upper connecting lugs 120, and the outer surface of the upper port of the steel casing unit 110 below the splicing seam 111 is provided with several lower connecting lugs matching the upper connecting lugs 120 130 , each pair of upper connecting lugs 120 and lower connecting lugs 130 is respectively provided with a first connecting hole 121 and a second connecting hole 131 , which are connected by bolts 140 . As an example, the combined steel casing 100 with a length of 6m is welded on site by two steel casing units 110 with a length of 3m. The steel casing unit 110 is made of 10mm manganese steel. The con...

Embodiment 2

[0039] The present invention also provides a construction method of the combined steel casing for the backfill rotary excavation cast-in-situ pile in Embodiment 1, the following is combined with the attached Figure 1 to Figure 4 The construction method is further described, specifically including the following steps:

[0040]S1. The steel casing unit 110 of the combined steel casing 100 is prefabricated in the factory, and the upper connection ear plate 120 with the first connection hole 121 and the lower connection ear plate 130 with the second connection hole 131 are welded, and transported to the construction site . Preferably, each section of steel casing unit 110 is numbered according to the construction sequence, and the lower port of the first section of steel casing unit 110 and the upper port of the last section of steel casing unit 110 are not welded with ear plates.

[0041] S2. Level the surface soil in the area to be constructed, set the line to locate the cente...

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Abstract

The invention relates to a combined steel casing for rotary drilling of a cast-in-place pile in backfilled soil and a construction method thereof, and belongs to the technical field of rotary drillingbored pile construction. The combined steel casing is formed by splicing a plurality of steel casting units in sequence, the steel casting units on the upper side and the lower side of each spliced seam are provided with a plurality of upper connection lug plates and a plurality of lower connection lug plates in pairs, and the upper connection lug plates and the lower connection lug plates are provided with first connection holes and second connection holes in a correspondence mode and connected through bolts. Each steel casting unit of the combined steel casing is low in weight and convenient to machine, transport and construct on site, can be flexibly spliced according to the required length, has wider applicability and is reliable in connection, convenient to splice and low in manufacturing cost. The construction method has the advantages that procedures are simple, operation is convenient, and the construction efficiency is high.

Description

technical field [0001] The invention relates to a combined steel casing for backfilling soil rotary-dig cast-in-place piles and a construction method thereof, belonging to the technical field of rotary-dig cast-in-place pile construction. Background technique [0002] In the construction of bored piles, steel casings are often buried to locate the piles to be drilled and to protect the bore hole. Especially in the construction of bored piles in the backfill area, due to the looseness of the backfill soil, it is easy to deflect the pile body, shrink the diameter of the pile hole, collapse the hole or even fail to form a hole during the drilling process. more necessary. [0003] However, the diameter of the steel casing is usually more than 1m, and the wall thickness is more than 10mm. When the steel casing exceeds 6m, the quality is relatively heavy, and there are problems that it is difficult to process and inconvenient to transport. Contents of the invention [0004] Ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E02D5/66
CPCE02D5/38E02D5/665
Inventor 高阔王吉祥
Owner SHANGHAI CONSTR NO 5 GRP CO LTD
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