Connecting structure of H-shaped steel coupling beam and H-shaped steel main support and construction method of horizontal support

Abstract

The invention discloses a connecting structure of an H-shaped steel coupling beam and H-shaped steel main supports, which is used for connecting a plurality of H-shaped steel main supports which are horizontally arranged and parallel to each other into a whole, and first webs of the H-shaped steel main supports and second webs of the H-shaped steel coupling beam extend in the vertical direction; a notch is formed in the H-shaped steel coupling beam and corresponds to at least one H-shaped steel main support, the notch upwards penetrates through an upper flange of the H-shaped steel coupling beam, and a distance is formed between the notch and a lower flange of the H-shaped steel coupling beam; a notch is formed in the H-shaped steel main support, the notch is clamped on the H-shaped steel main support, a steel cover plate is detachably installed on an upper flange of the H-shaped steel coupling beam, the steel cover plate crosses the notch, the H-shaped steel main support is tightly pressed in the notch in an abutting mode, and the upper surface of the H-shaped steel main support and the upper surface of the H-shaped steel coupling beam are coplanar. The invention further discloses a construction method of the horizontal support adopting the connecting structure. The H-shaped steel coupling beam and the H-shaped steel main support are connected through the notches in the H-shaped steel coupling beam, holes are prevented from being formed in the H-shaped steel main support, the integrity of the H-shaped steel main support is guaranteed, and the protection grade of a foundation pit can be improved.

Description

technical field [0001] The invention relates to a connection structure between an H-shaped steel connecting beam and an H-steel main support and a construction method for a horizontal support. Background technique [0002] During the excavation of the foundation pit, in order to ensure the safety of the foundation pit and avoid landslides, it is often necessary to erect horizontal supports in the foundation pit to provide horizontal support for the supporting piles or retaining walls. The connecting beams between the supports, in which the main support provides support for the supporting piles or supporting walls, and the connecting beams connect the adjacent main supports to improve the stability of the main supports and form a network structure. [0003] At present, the horizontal supports of steel structures are widely used. H steel is often used as the main support, and relatively small section steel is used as the connecting beam. In order to facilitate disassembly and ...

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Problems solved by technology

[0003] At present, the horizontal supports of steel structures are widely used. H steel is often used as the main support, and relatively small section steel is used as the connecting beam. In order to facilitate disassembly and installation, the main support and the connecting beam are generally connected by connecting plates and bolts. This requires A large number of bolt holes are opened on the flange or web of the main support, which makes the local part of the main support damaged and becomes a weak point, which is not conducive to the safe construction of the foundation pit

[0004] In order to improve the safety during foundation pit excavation and underground structure construction, sometimes prestressing is applied to the main brace to improve the pressure resistance of the main brace and reduce the deformation of the foundation pit. When the braces are connected, because the connecting beams are connected to the main braces by bolts or welding, in the process of applying prestress to the main braces, the length of the main braces will change to a certain extent, which will drive the corresponding connecting beams to move, and each During the prestressing process of the main brace, the length changes produced will not be exactly the same, and there will always be some differences, resulting in the simultaneous effect on the connecting beam during the prestressing process of the main brace. The effect of the beam is different, resulting in a certain degree of bending deformation of the coupling beam, which affects the overall stability of the horizontal support

In order to avoid the reduction of the stability of the horizontal support due to the deformation of the coupling beam, in some foundation pits, the horizontal support only uses the main brace, and the coupling beam is cancelled. Although the cancellation of the coupling beam can eliminate the above problems, it increases the erection of the main support Difficulty, and a certain number of columns need to be erected for each main support. Too many columns increase the difficulty of foundation pit excavation and underground structure construction, and cannot improve construction efficiency

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