Subway superlarge section tunnel underground excavation support replacement and main body structure construction method
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A technology of super large section and main structure, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as hidden safety hazards, and achieve the effect of improving pouring quality, good integrity and reducing erection height.
Active Publication Date: 2019-02-22
中水电四局华中(武汉)工程有限公司 +1
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[0006] The purpose of the present invention is to solve the problem of potential safety hazards in the existing large-section multi-channel temporary middle partition removal method because the waterproof layer is laid after the support is cut off
Method used
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specific Embodiment approach 1
[0046] Specific implementation mode one: combine Figure 1 to Figure 7 Illustrate this embodiment, the construction method of a kind of submerged excavation of subway super-large-section tunnel submerged support and main structure of this embodiment, the main structure of underground excavation of subway super-large-section tunnel adopts the method of construction, and its implementation process is:
[0047] Step 1: After the initial support of the excavation and the back grouting are completed, the concrete cushion is poured;
[0048] Adopt the method of excavation and support in layers and divisions, excavate and support in layers from top to bottom, perform grouting behind the initial support, and pour a concrete cushion to form the foundation pit support structure 1;
[0049] Step 2: Remove the concrete and steel mesh 8, and remove part of the I-beam for the first time;
[0050] The foundation pit support structure 1 is the fifth layer 2, the fourth layer 3, the third lay...
specific Embodiment approach 2
[0072] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the sequence of excavation and support in Step 1 of this embodiment is: excavation and support in layers from top to bottom, with the same layer first on both sides and then in the middle to complete all the excavation and support work. With such setting, the efficiency of excavation and support is improved, and safety is ensured. The other components and connections are the same as those of the first embodiment.
specific Embodiment approach 3
[0073] Specific implementation mode three: combination figure 2 To describe this embodiment, the distance between two adjacent I-beams exposed on the partition wall 7 from the first floor to the fifth floor of this embodiment is 0.5m. With such a setting, the spacing is reasonable, which is convenient to ensure the safety performance of the support. Other compositions and connections are the same as those in Embodiment 1 or 2.
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Abstract
The invention relates to a subway superlarge section tunnel underground excavation support replacement and main body structure construction method, and relates to a construction method. In order to solve the problem that potential safety hazards exist on an existing large-section multi-channel temporary median septum disassembling method, the construction method comprises the steps of after finishing excavation initial supporting and back grouting, pouring a concrete cushion, breaking a fifth layer of median septum concrete and a reinforcing mesh plate, paving a waterproof layer, then concreting a reinforcing steel bar and a template, and constructing a bottom plate structure; disassembling horizontal supports on two sides of a fourth layer, paving side wall waterproof layers, and constructing side wall structures; disassembling horizontal supports on two sides of a third layer, paving side wall waterproof layers, and constructing side wall structures and a lower middle layer plate; disassembling horizontal supports on two sides of a second layer, paving side wall waterproof layers, and constructing side wall structures and an upper middle layer plate; disassembling horizontal supports on two sides of a first layer, replacing an arch part vertical support, paving side walls and an arch part waterproof layer, and constructing the side walls and an arch part structure; and disassembling all vertical supports. The subway superlarge section tunnel underground excavation support replacement and main body structure construction method provided by the invention is applied in subway and tunnel projects.
Description
technical field [0001] The invention relates to a construction method, in particular to a construction method for submerged super-large-section tunnel excavation and replacement of braces and a main structure, and belongs to the technical field related to subway and tunnel engineering. Background technique [0002] In the process of urban subway construction, it is inevitable to encounter super-large cross-section tunnels (excavation span of 10m to 15m, super-large cross-section refers to: excavation cross-sectional area greater than 100㎡), such as crossing lines, return lines, field access lines, and parking lines , connecting lines, air ducts and stations, etc. When conditions such as ground transportation and buildings permit, open-cut methods are often used to build super-large-section tunnels. For example, the total length of the section between Hanxi Station and Shiqiao Station of Guangzhou Metro Line 3 is about 6km, and the shield method is mainly used for constructio...
Claims
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Application Information
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