Prestressed fish belly sill with inclined stay bars for retaining and protecting for deep foundation excavation

A technology of deep foundation pit support and fish-belly beam, applied in joists, girders, truss beams, etc., can solve the problems of less underground space occupation around the pit, strong deformation control ability, and large operation space, and achieves the connection strength and The effect of low rigidity requirements, improved stable bearing capacity, and increased safety reserves

Inactive Publication Date: 2018-09-21
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved is to overcome the shortcomings of the prior art that the deep foundation pit support structure has strong deformation control ability, large construction operation space in the pit, and less underground space around the pit.

Method used

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  • Prestressed fish belly sill with inclined stay bars for retaining and protecting for deep foundation excavation
  • Prestressed fish belly sill with inclined stay bars for retaining and protecting for deep foundation excavation
  • Prestressed fish belly sill with inclined stay bars for retaining and protecting for deep foundation excavation

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Embodiment Construction

[0029] The support rods are fixed on the waist beam through the angle conversion device, the angles formed by the support rods and the waist beam are not the same, and the left and right symmetrical arrangements of the support rods are arranged on the waist beam. The stay cables pass through the stay cable passages of the respective cable bracing nodes, and both ends of the stay cables are anchored in the stay cable anchoring devices. The strut supports the cable through the cable channel of the cable brace node and changes its angle with the waist beam, and the cable can slide freely in the cable channel without being affected by a large force. Friction constraints. The fish-belly beam is fixed to the adjacent purlins and pair (corner) braces through the connecting device reserved on the cable anchoring device.

[0030] The struts are located on the angle bisectors of the cables on both sides of the cable bracing node, and the stress of the struts is mainly axial pressure. ...

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Abstract

The invention discloses a prestressed fish belly sill with inclined stay bars for retaining and protecting for deep foundation excavation. The prestressed fish belly sill with the inclined stay bars for retaining and protecting for deep foundation excavation comprises a waist beam, at least one stay bar and at least one pull cable; the stay bars are positioned on angular bisectors of the adjacentpull cables, length adjusting devices are serially connected into the stay bars, and the pull cables comprise stand cables. Two ends of the fish belly sill are spliced with adjacent surrounding purlins, and symmetric or angle brace supports are arranged at the ends of the fish belly sill. By application of prestress and the supporting effect of the stay bars to the waist beam, the bending stiffness of the fish belly sill is high, the number of braces can be reduced, and thus, an operation space in the pit is increased. The stay bars are only subjected to axial pressure, and are high in stability bearing capacity; the lengths of the stay bars are adjusted according to monitoring data, and deformation of a foundation pit supporting structure can be controlled well; and by mounting of the standby cables, the rigidity and emergency capacity of the fish belly sill are improved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a prestressed fish-belly beam with inclined struts for deep foundation pit support. Background technique [0002] With the rapid advancement of my country's urbanization process, the development and utilization of underground space has gradually attracted people's attention. Excavation of foundation pit will inevitably affect adjacent buildings or structures, and even cause accidents such as surface subsidence and structural collapse in severe cases. Therefore, for general foundation pit engineering, it is necessary to carry out reasonable foundation pit support structure design and construction in combination with geological conditions and surrounding environment. [0003] At present, the commonly used support structures can be divided into four categories: grading, gravity cement-soil walls, soil-nailed walls, and retaining structures. Among them, the retaining stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E04C3/04E04C3/11
Inventor 周臻郭从明王立云马士良
Owner SOUTHEAST UNIV
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