| 摘要 |
A concrete pumping unit, such as a mobile pumping vehicle, including a reduced-weight and/or lengthened boom arm. The pumping vehicle includes a boom arm (12) that is extendible between a folded position and an extended position. The boom arm carries a supply pipe formed from a plurality of pipe sections (18) formed from a lightweight urethane. Each pipe section is formed from a composite material having a reinforcing outer layer (40) and a wear resistant inner layer (42). Preferably, the outer layer is formed from a braided fiber material while the inner wear resistant layer is formed from urethane. Each boom pipe section includes a pair of end couplings (30, 32) adhesively attached to the outer surface of the boom pipe section.
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