| 摘要 |
<p>Precast concrete wall panels are made by pouring a first concrete layer into a form. The second concrete layer is then poured in spaced relation above the first concrete layer before the first concrete layer has cured. The space between the concrete layers is maintained by a layer of aggregate, support sheets, an insulation layer or air bags or a combination thereof. Connectors are anchored in the first and second concrete layers so as to tie the layers together. After the first and second concrete layers have cured, the aggregate, support sheets or air bags are removed to create space between the concrete layers. The panels can be assembled into a wall structure. An intermediate layer of concrete can be poured into the space between the wall panels such that the panels define the form for the intermediate concrete layer and become an integral part of the wall structure. The wall structure may extend below or above grade and may be multi-tiered. The egdes of the wall panels may be flat for a butt joint or contoured so as to interlockingly matingly engage when assembled into the wall structure. Notches may be provided in the upper edge of the wall panels so as to receive floor structure.</p> |
