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Construction method of internal support structure supported by steel sheet piles

A supporting structure and construction method technology, applied in foundation structure engineering, sheet pile walls, excavation, etc., can solve the problems of unclosed foundation pit, weak integrity and low rigidity of purlins and internal support structures, etc., and achieve good integrity , good support effect, high rigidity effect

Active Publication Date: 2017-06-13
LIAONING ZIZHU PILE FOUND ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The general form of internal support system is only a plane structure, especially in some pipeline foundation pit support projects, the length of the foundation pit is often much larger than the width, and the foundation pit is usually not closed, which makes the surrounding purlin and the internal support structure Weaker integrity and less rigidity

Method used

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  • Construction method of internal support structure supported by steel sheet piles
  • Construction method of internal support structure supported by steel sheet piles
  • Construction method of internal support structure supported by steel sheet piles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The dimensions of the pipeline foundation pit are: width about 5m, length about 265m, foundation pit depth 6.5m. It is supported by hot-rolled Larsen SPU-IV400x170 steel sheet piles, L=12m. The columns and beams of the rigid frame are all made of hot-rolled H-shaped steel of HM390x300x10x16 type. The inner support rigid frame adopts a layer of beams, and the horizontal span of the rigid frame is 3.2 meters.

[0040] A construction method for an inner support structure supported by steel sheet piles, the specific steps are as follows:

[0041] 1) Weld the hot-rolled HM390x300x10x16 type H-shaped steel on the outside of the Larsen U-shaped steel sheet pile. The carbon dioxide gas shielded welding method is used for welding, and the outer side is intermittently welded. The rate reaches about 60%, and the height of the welding foot is 8mm. The head of the steel sheet pile is 1.2 meters higher than the H-shaped steel, the top of the H-shaped steel is welded with a steel p...

Embodiment 2

[0048] Dimensions of foundation pit for sewage interceptor box project: width about 6.6m, length about 80m, depth of foundation pit 8m. It is supported by hot-rolled Larsen SPU-IVw600x210 steel sheet piles, L=12m. The columns and beams of the rigid frame are all made of hot-rolled H-shaped steel HN700x300x13x24. The inner support rigid frame adopts two layers of beams, and the horizontal span of the rigid frame is 3.6 meters.

[0049]1) The U-shaped steel sheet pile and the H-shaped steel are welded. The carbon dioxide gas shielded welding method is used for welding, and the outer side is intermittently welded. The ends of the steel sheet piles are welded for 800mm, and then welded every 300mm for a length of 400mm, and the welding rate reaches about 60%. , The height of the solder feet is 8mm. The head of the steel sheet pile is 1.2 meters higher than the H-shaped steel, the top of the H-shaped steel is welded with a steel plate, and bolt holes are reserved on the steel pla...

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Abstract

The invention relates to a construction method of an inner support structure supported by steel sheet piles. Hot-rolled H-shaped steel is welded on the outside of Larsen U-shaped steel sheet piles to form rigid frame columns, and both sides of the foundation pit are symmetrically driven into rigid frame columns and steel sheet piles. The first rigid frame beam is erected on the symmetrical rigid frame column, and the second rigid frame beam is erected on the adjacent rigid frame column, so that the inner support of the entire foundation pit is supported to form an overall rigid frame structure. The invention directly erects the crossbeam on the top of the column of the rigid frame without additional components such as supporting plates, the process is simple, and the construction speed is fast. It can be widely used in foundation pit support projects such as building foundation pits and pipeline foundation pits where the groundwater level is not high and the width of the foundation pit is not too large, especially for those with poor geological soil layers and high requirements for internal support strength and stability Foundation pit engineering can achieve better results, and at the same time, it can also give full play to its advantages for foundation pit support projects with tight construction schedules.

Description

technical field [0001] The invention relates to the field of steel sheet pile construction, in particular to a construction method for an inner support structure supported by steel sheet piles. Background technique [0002] In conventional steel sheet pile foundation pit support engineering, the support form is generally, the support plate is welded on the inner side of the steel sheet pile along the direction of the foundation pit, the purlin (waist beam) is installed on the support plate, and then vertically (or at a certain angle) in the purlin on both sides ) to install the inner support to form the support system inside the foundation pit supported by steel sheet piles. [0003] The general form of internal support system is only a plane structure, especially in some pipeline foundation pit support projects, the length of the foundation pit is often much larger than the width, and the foundation pit is usually not closed, which makes the surrounding purlin and the inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D5/04
Inventor 张庆国岳嫣王宇刘忠伟
Owner LIAONING ZIZHU PILE FOUND ENG CO LTD