Forming construction method of long-spiral pore-forming pile-slab-pile supporting and anti-seepage continuous wall

Abstract

The invention discloses a forming construction method of a long-spiral pore-forming pile-slab-pile supporting and anti-seepage continuous wall. The continuous wall is formed in a manner that a long-spiral drilling high-pressure jetting cemented soil composite concrete pile slab composite pile is taken as a construction main body and pile-slab-pile crossed construction and combination in different sequences is carried out. The forming construction method comprises the following steps that Step one, construction preparation is carried out; Step two, pile foundation construction and pore-forming are carried out, high-pressure jetting cement paste slab forming hole construction, and press grouting pile slab concrete construction are carried out, concrete is subjected to press grouting to reach the elevation of a pile top, then first plain concrete pile slab construction is accomplished; Step three, a second plain concrete pile slab is coaxially connected and constructed according to a designed pile space, and after second plain concrete pile slab construction is accomplished, the construction of a pile-slab-pile supporting and anti-seepage continuous wall structural unit is accomplished; and Step four, the pile slab construction of the next unit is carried out according to the operational procedures above, then the complete pile-slab-pile supporting and anti-seepage continuous wall is formed. According to the forming construction method of the long-spiral pore-forming pile-slab-pile supporting and anti-seepage continuous wall, stand-alone construction is realized, the equipment investment is low, the energy consumption is low, and the cost is saved.

Description

technical field [0001] The invention relates to a diaphragm wall construction method, in particular to a long spiral hole-forming pile sheet pile support and anti-seepage diaphragm wall forming construction method, which belongs to the technical field of foundation construction engineering. Background technique [0002] With the rapid development of the national economy and infrastructure construction, the scale of foundation pit support, water stop and other projects has been greatly increased. In order to save engineering cost and investment, and to improve the horizontal shear resistance of the support system and the anti-seepage ability of the water-stop structure, a large number of retaining wall support structures have been developed in China in recent years; among them, the commonly used forms of retaining walls are: row piles Wall, underground diaphragm wall, sheet pile wall, reinforced cement-soil wall, etc.; pile row walls are generally composed of cast-in-place pi...

AI Technical Summary

Problems solved by technology

In order to save engineering cost and investment, and to improve the horizontal shear resistance of the support system and the anti-seepage ability of the water-stop structure, a large number of retaining wall support structures have been developed in China in recent years; among them, the commonly used forms of retaining walls are: row piles Wall, underground diaphragm wall, sheet pile wall, reinforced cement-soil wall, etc.; pile row walls are generally composed of cast-in-place piles and high-pressure rotary grouting piles to form a row of pile diaphragm walls. This construction method is used as a combination of support and anti-seepage. It is used on a large scale in foundation pit support and anti-seepage projects; however, this construction method is cross-construction of cast-in-place piles and high-sprayed piles, which requires a lot of equipment investment and high energy consumption; the construction of high-pressure rotary grouting piles has a lot of cement slurry loss, resulting in great waste of materials and Environmental pollution; high jetting piles and cast-in-situ piles are closely connected in construction, and the requirements for pile position deviation and verticality are very strict. If the control is not proper, quality defects will often appear in the joint parts of the two pile types, which will affect the quality of the project; at the same time, due to the two Restricted by site conditions and construction specifications, the pile-type cross construction generally has a long construction period, which is not conducive to the rapid development of the project; therefore, the pile-row wall has defects in terms of economy, quality, and construction period; the slab-type underground diaphragm wall is currently the most widely used Diaphragm wall type, the diaphragm wall has the advantages of thick wall, large depth, strong shear resistance, and remarkable anti-seepage ability; it is currently used in subways, underground stations, shield and tunnel working shafts, industrial building sedimentation tanks and ultra-deep foundations. Widely used in pits and achieved good results

However, the diaphragm wall has the disadvantages of complex construction equipment, high cost, mud pollution, quality defects in joint construction, and long construction period; There are limitations in the selection of drilling rigs in the selection of construction equipment for walls and slab-type underground diaphragm walls, and there are deficiencies in construction progress, quality, environmental protection, energy saving, and application range; the above-mentioned construction method

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