Construction method for tunneling excavation through matching of down-the-hole drill and breaking hammer
A construction method and down-the-hole drilling technology, which are applied in earth-moving drilling, mining equipment, tunnels, etc., can solve the problems of increasing excavation time, slowing down excavation speed, and having a large impact on surrounding environmental protection, so as to improve construction efficiency and save construction. Cost and effect of reducing construction difficulty
A construction method and down-the-hole drilling technology, which are applied in earth-moving drilling, mining equipment, tunnels, etc., can solve the problems of increasing excavation time, slowing down excavation speed, and having a large impact on surrounding environmental protection, so as to improve construction efficiency and save construction. Cost and effect of reducing construction difficulty
CN109296378AActive Publication Date: 2019-02-01CHINA COMM 2ND NAVIGATIONAL BUREAU 2ND ENG +1
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Embodiment 1
[0046] Such as Figure 1~6 As shown, the excavation method of down-the-hole drilling combined with breaking hammer excavation was applied to Zengjiayan Bridge, which connects Jiangbei District and Yuzhong District of Chongqing, and is located between Jialing River Bridge and Huanghuayuan Bridge. Because there are many old residential buildings around the construction passage, it is To ensure construction safety, mechanical development and excavation are adopted for construction.
[0047] After testing, the 5 surrounding rocks at the tunnel face of the pilot tunnel are grade III, mainly composed of sandstone and sandy mudstone, with good integrity. The uniaxial compressive strength of the rock reaches 70MPa. Since the pilot tunnel passes through the old factory area of Chang'an factory, precision processing plant, Chang'an hospital, etc., construction vibration has a high impact on it.
[0048] The construction method of down-the-hole drilling combined with breaking hammer ...
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Abstract
The invention discloses a construction method for tunneling excavation through matching of a down-the-hole drill and a breaking hammer. The construction method comprises the following steps that firstly, peripheral outline holes, slotting holes and breaking holes are formed in a tunnel face through a total station, and marks are made; secondly, the track-type hydraulic down-the-hole drill is utilized for drilling, according to the drilling sequence, the peripheral outline holes are drilled firstly, the slotting holes are formed in middle areas of a lower-middle section of the tunnel face, andthe breaking holes are formed in the rest part of the tunnel face; and thirdly, the breaking hammer is utilized to break the tunnel face from bottom to top in the vertical direction, the area with thedense hole pitch in the lower portion is broken firstly, a free face is dug out, then upward excavation is conducted layer by layer, and breaking is conducted according to the sequence of bottom, top, left, right and periphery. Interference to peripheral buildings is reduced, construction noise is controlled, tunneling of a tunnel body is accelerated, the design goal is achieved, and significantsocial benefits and economic benefits are achieved.
Description
technical field [0001] The invention relates to the field of tunnel construction. More specifically, the present invention relates to a construction method for excavation with a down-the-hole drill combined with a breaking hammer. Background technique [0002] Due to the limitation of surface land area, the development of underground space has received more and more attention. As a typical example of the development and utilization of underground space, urban tunnels have made great contributions to alleviating urban traffic congestion. For urban tunnels surrounded by dense buildings, old houses, shallow tunnel burial depth, good surrounding rock integrity, and high environmental protection requirements, mechanical excavation is generally used for excavation; the current tunnel mechanical excavation method There are the following types: [0003] One is the excavation using conventional crawler-type breakers, that is, according to the tunnel excavation contour line measure...
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Patent Timeline
01 Feb 2019
Publication
CN109296378A
- IPC
- E21D9/10
- CPC
- E21D9/106
- Inventors
- 刘小勇; 范波