顶管工作坑可拆卸支护型式设计研究

Design Research on Dismountable Support System of the Pipe-Jacking Working Pit

摘要:

介绍了顶管工作坑施工中可拆卸支护型式主要组成要素，包括竖向空心立柱和厚度不一的特制板材两大部分。其中竖向立柱可以通过传力装置、气锤或是小型钻机成孔的方式埋设到预计深度，通过分层开挖的型式逐层铺设特制板材进行支护。详细阐述了支护型式的结构型式、工作原理、施工工艺和设计理论。并结合工程实例，叙述其设计流程，根据实际计算值验证立柱刚度选择的可行性及特质板材尺寸设计的合理性，避免传统施工工艺复杂的现状，达到节约工程材料、提高施工效率、降低工程成本的目的。

关键词:顶管;工作坑;可拆卸支护型式;立柱;特制板材;传力装置

Abstract:

The main elements of the dismountable support system for working pit are introduced including 2 parts of vertical hollow column and special steel plate with uneven thickness. The vertical hollow column can be laid into the expected depth by force transfer device, air hammer or small drill. The special steel plate is laid layer by layer through stratified excavation. Structure type, working principle, construction technology and design theory are introduced and the design process is described combined with engineering example. The feasibility of column selection and rationality of the special steel plate size are verified according to the actual calculation to avoid the complexity of traditional construction technology, save engineering materials, improve construction efficiency and reduce project cost.

Key words:pipe jacking; working pit; dismountable supporting type; hollow column; special steel plate; force transfer device