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What is a joint box for ground wall construction?

Update:22-10-2021
Summary:

Commonly used construction joints for underground conti […]

Commonly used construction joints for underground continuous walls are:
Flexible joints: round center lock pipe joints, corrugated pipe (double wave, triple wave) joints, prefabricated joints and rubber waterstop joints. The underground continuous wall structure with poor shear and bending resistance and generally not used as the main structure. The local lower continuous wall is only used as the basement outdoor wall and does not bear the vertical load of the upper structure or the load sharing is small. By adopting some structural measures, it can be adopted Flexible joint
Rigid joint: lap joint of perforated steel plate and steel bar.
Perforated steel plate joint: It is widely used in engineering. This joint can bear the shear force on the vertical joint of the continuous underground beam, so that the adjacent underground continuous wall trough section can jointly bear the vertical load of the upper structure, coordinate the uneven settlement of the trough section, and at the same time The perforated steel joint has good waterproofness.

Reinforcement lap joint: Adopt the concave-convex lap joint of the horizontal steel bar in the adjacent stage. The rebar cage of the groove section is constructed in advance. The lap part is extended on both sides. Through construction measures, the rebar lap joint space can be left when the concrete is poured. Pouring, then lap joint steel bars, pouring the back trough section.
Rigid joint: If the underground continuous wall and the structural slab jointly bear a large bending moment at the joint, and the flexural rigidity of the two members are similar, and the plate thickness is sufficient to allow the reinforcement of the rigid connection, rigid connection is adopted.
The common ones are pre-embedded rebar connector connection (taper thread, straight thread) and pre-embedded rebar connection. The structural bottom plate and the underground continuous beam are usually connected by steel bar connectors.
Incomplete rigid connection of structural joints: The thickness of structural slabs is smaller than that of the underground continuous wall. A certain amount of steel bars can be arranged in the slabs to withstand a certain bending moment. However, many steel bars in the slabs cannot be configured to form rigid connections. Incompletely just connected form.

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