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A reverse construction method
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A construction method and reverse work technology, which is applied in artificial islands, water conservancy projects, infrastructure projects, etc., can solve the problems of poor construction environment, slow excavation speed, and reduced construction efficiency, so as to improve time and space efficiency, improve construction speed, and save energy. The effect of building materials
Active Publication Date: 2018-07-03
武汉志和岩土工程有限公司
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Abstract
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Problems solved by technology
In the traditional upside-down construction, only the section of the basement floor is cut open, and the area from the second basement floor is constructed by underground excavation. The excavation speed is relatively slow and the construction environment is poor. In addition, when pouring the roof of the basement floor and the roof of the second floor , both need to be supported, which further reduces the construction efficiency
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Embodiment 1
[0038] according to Figure 1 to Figure 8 As shown, the reverse construction method is used to construct the three underground floors. The foundation pit is long and strip-shaped. After calculation, under the condition of ensuring the necessary working plane at the bottom of the pelvic cavity 3, the pelvic cavity 3 can be directly dug to the third underground floor. The specific construction steps are as follows:
[0039] A. Design the foundation pit: according to figure 2 As shown, the shape and size of the three-story underground foundation pit are designed, and an enclosure structure 1 is set up around the foundation pit. The enclosure structure 1 adopts an underground diaphragm wall, and steel columns 2 are set up at the same time;
[0040] B. Open and cut earthwork: according to image 3 As shown, the pot cavity 3 is excavated from the top of the soil layer, and a section of flat soil 31 is left between the opening of the top of the earth and the enclosure structure; ...
Embodiment 2
[0046] Different from the above-mentioned embodiment 1, according to Figure 1 to Figure 9 As shown, the reverse construction method is used to construct 4 underground floors. The foundation pit is long and strip-shaped. After calculation, in order to ensure the necessary working plane at the bottom of the pelvic cavity 3, the maximum depth of the pelvic cavity 3 can be dug to the 3rd underground floor. The specific construction Proceed as follows:
[0047] A. Design the foundation pit: design the shape and size of the three-story foundation pit underground, and set up an enclosure structure 1 around the foundation pit. The enclosure structure 1 adopts an underground diaphragm wall and sets up steel columns 2 at the same time;
[0048] B, earthwork open excavation: excavate the pot cavity 3 from the top of the soil layer, and leave a section of smooth soil 31 between the opening on the top of the earthwork and the enclosure structure; °, the excavation depth is three floors u...
Embodiment 3
[0054] The difference from the above-mentioned Example 1 is that the width of the construction pit is doubled, and step B adopts the method of excavating a pelvic cavity 3 alone, which is not enough to make the bottom of the pelvic cavity 3 exceed the design depth of the underground layer. According to Figure 10 As shown, in step B, two side-by-side pelvic cavities 3 are cut out, and the rest of the steps are the same as those in embodiment 1.
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Abstract
The invention relates to the field of ground engineering construction and specifically relates to a top-down construction method. The method comprises the steps that (A) foundation pits are designed, wherein shapes and sizes of the foundation pits of M underground layers are designed, an enclosing structure is set up and steel uprights are established; earthwork open cutting is conducted; (C) a center baseplate of the first underground layer is erected; (D) concrete of a top layer structure of the first underground layer is poured, wherein side slopes and the steel uprights are taken as support for pouring of the top layer of the first underground layer; (E) stripping and excavation of the side slopes of the first underground layer are conducted; and (F) construction is carried out layer by layer. Slope-reserved deep basin-type excavation is adopted, so that the earth volume of open cutting is large and excavation efficiency is high; and the center baseplate of the first underground layer is erected in a suspended manner, the side slopes and the steel uprights are taken as the support for the top layer of the first underground layer, and a traditional supporting template is canceled, so that construction efficiency is greatly increased and consumption of material sis reduced. When the pouring of the top layer of the first underground layer is completed, structures above and under the ground can be constructed at the same time, so that time-space efficiency is increased.
Description
technical field [0001] The invention relates to the field of building underground engineering, in particular to a reverse construction method. Background technique [0002] At present, the construction methods of underground structures mainly include forward construction method and reverse construction method. The straight method is to excavate the soil to the design elevation first, and then build the main facilities such as the bottom plate, wall and roof in sequence from bottom to top. The excavation speed of the structure is fast, but for the construction of multi-layer underground, the construction above the ground needs to be completed after the underground structure is completely constructed, and the comprehensive time-space efficiency of the entire construction is low. The main steps of the traditional reverse method include: 1. Excavate the space of the first basement; 2. Set up supports on the first basement and pour the roof of the first basement; 3. Remove the s...
Claims
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Application Information
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