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【简答题】
某施工单位承担了一座50t电弧炉的建设工程,该项目是国家投资的,由于投资者对投资行为和建筑市场材料变化缺乏有效的了解和估计,在项目正式启动后出现了严重超概算现象,经过承包发包方协商,进行工程造价换项的变更,要求制定新的费用和价格,在工程变更和价格调整的结算与支付中,发现该项目涉及的款额超过了合同原定工程造价的15%。 问题: ①该工程项目的超概算现象是如何造成的？请写出可能的两个原因。为避免这种现象发生,要求监理工程师怎样操作？ ②承包方按照监理工程师的要求,通常要进行哪些变更？ ③工程变更价格的确定原则有哪些？ ④针对该施工项目的具体情况,对工程变更和价格调整的结算支付中发现该项目涉及款额超过了合同价格的15%,这一现象应该如何处理。
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