Prefabricated internal support system and construction method for foundation pit support system

Abstract

The invention discloses a prefabricated internal support system and a construction method for a foundation pit support system. The prefabricated internal support system comprises a top beam (1), an enclosing purline and an inner support (2), wherein the inner support (2) is a truss type inner support (2) assembled by splicing a pre-stressed hollow square pile (3) and a node connecting piece; first end plates on the two ends of the truss type inner support (2) are in screwed connection with a connecting plate on the top beam (1), and the rest of the first end plates are in screwed connection with second end plates of the node connecting piece; the construction method comprises the key points that the pre-stressed hollow square pile (3) and the node connecting piece are assembled into the truss type inner support (2) in a splicing manner, and the two ends of the truss type inner support (2) are connected with the top beam (1). The prefabricated internal support system and the construction method for the foundation pit support system has the advantages that the system and the method are convenient and efficient, the construction speed is high, the construction period is short, the follow-up earth cutting and earth discharging are convenient, the dismounting process is also convenient, efficient and labor-saving, no safety potential hazard is caused, the system can be recycled, and the material is saved.

Description

technical field [0001] The invention relates to the construction technology of the inner support system of the foundation pit support system in the field of civil engineering, in particular to a prefabricated assembled inner support system of the foundation pit support system and a construction method. Background technique [0002] With the development of urbanized buildings, it has become a trend to make full use of underground space, the depth and area of ​​excavation of foundation pits are also expanding, and the application of foundation pit support systems is becoming more and more extensive. The foundation pit support system in the prior art includes a pile-row or wall-type enclosure wall structure, a ring of roof beams and multiple purlins of different heights, reinforced concrete inner supports and water-stop curtains, wherein the roof beams, Purlins and reinforced concrete inner supports constitute the inner support system. [0003] The construction method of the f...

AI Technical Summary

Problems solved by technology

[0004] The internal support body and construction method of the foundation pit support system in the prior art have the following defects: First, the process of constructing the internal support requires digging long grooves, placing steel bars, and pouring concrete. The steps are cumbersome, time-consuming and laborious, and the speed is relatively slow; Second, after pouring the inner support of this layer, it is necessary to wait until the concrete supported in this layer is dry and hard to reach a certain strength before subsequent excavation, which prolongs the working hours; third, it is necessary to dig long grooves in the soil before pouring the inner support Instead of the formwork, in this way, the inner support of the layer must be poured before digging down. However, after the inner support is poured, a mess of inner supports will be formed. These inner supports must be bypassed during the excavation and excavation process, and the subsequent excavation And the unearthed process is disturbed, and the construction is inconvenient; Fourth, after the excavation of the foundation pit is completed, with the construction of the underground structure in the foundation pit, that is, in the process of pouring the outer wall of the underground structure from bottom to top, the inner support needs to be gradually removed. The underground main structure cannot use large machinery to dismantle the internal support. Generally, it is manually knocked out. However, the internal support has a large cross-sectional area and many reinforcements, and the disassembly is labor-intensive. The construction is time-consuming and laborious. The main structure may be damaged, posing safety hazards; fifth, the inner support is a temporary structure, which will eventually be destroyed and removed. The steel bars, concrete and other materials of the inner support cannot be reused, and the materials are expensive and not environmentally friendly.

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