Quick emergency diagonal bracing for foundation pit salvage, and construction method

Abstract

The invention provides a quick emergency diagonal bracing for foundation pit salvage, and a construction method, and belongs to the technical field of building construction. The quick emergency diagonal bracing is used for effectively relieving the situation that during large-area, deep-foundation-pit and support-free earth excavation, the stress and deformation speed of a foundation pit enclosurewall are too large, and thus the potential safety hazard to a site is generated. According to the quick emergency diagonal bracing, a first pre-embedded piece is mounted on the side wall, close to the inner side of a foundation pit, of a retaining type enclosure structure at a foundation pit platform in the vertical direction of the retaining type enclosure structure, a second pre-embedded pieceis mounted on a thickened cushion layer at the bottom of the foundation pit, then the two ends of a profile steel support manufactured by a plant are connected with the first pre-embedded piece and the second pre-embedded piece in a full weld mode correspondingly to form the diagonal bracing, and thus the diagonal bracing serve as an emergency rescue measure of the foundation pit; the profile steel support can effectively shorten the emergency salvage time so as to shorten the construction period; the large construction space is saved for construction of a structure body; and the stress form of the profile steel support is good, the stress of the foundation pit enclosure wall and the stress of soil body bulges are counteracted mutually, and the foundation pit enclosure form can be reinforced effectively.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a fast emergency diagonal brace for foundation pit rescue and a construction method. Background technique [0002] When the deep foundation pit enclosure adopts the underground retaining wall (retaining structure), and the depth of the foundation pit exceeds 6m and the area of ​​the foundation pit is large, the emergency measures of section steel support can be adopted. If general foundation pit rescue measures are used, such as slope top unloading, slope toe back pressure, bolt reinforcement, spray anchor support, etc., due to the original foundation pit enclosure measures and large foundation pit depth, slope top unloading will Destroying the original bored pile enclosure will make the construction more difficult; the back pressure at the slope toe will affect the construction of the main structure floor, resulting in a lag in the construction progress. The constr...

AI Technical Summary

Problems solved by technology

If general foundation pit rescue measures are used, such as slope top unloading, slope toe back pressure, bolt reinforcement, spray anchor support, etc., due to the original foundation pit enclosure measures and large foundation pit depth, slope top unloading will Destroying the original bored pile enclosure will make the construction more difficult; the back pressure at the slope toe will affect the construction of the main structure floor, resulting in a lag in the construction progress. The construction floor still needs to remove heavy objects at the slope toe, which is a Measures to cure the symptoms but not the root cause; when the lower enclosure structure of the foundation pit project is a double row of bored piles and connecting beams, bolt reinforcement and spray anchor support are not applicable

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