Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1994-12-06
1996-08-20
Bagnell, David J.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405287, E02D 518, E02D 2902
Patent
active
055473164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Art
The present invention relates to civil engineering, particularly to erection of underground structures with a shallow foundation depth, using sectional monolithic walls in ground, based on prefabricated members.
2. Discussion of the Prior Art
Known in the prior art is a method for erecting a wall in ground involving digging a trench and concreting it (see L. V. Makovsky "Urban Underground Transport Structures", 1979, Stroyizdat (Moscow) p.330).
Also known is a prefabricated member of the sectional monolithic wall in ground, comprised of a reinforcing cage and a concrete body provided with longitudinal curvilinear slots on end faces (see A. L. Filatov "Erection of Structures by the "wall-in-ground" method", 1976, Budivelnik, (Kiev), p. 143). The wall built up of these prefabricated members is devoid of continuous cross reinforcement which affects adversely the reliability of the wall, i.e. reduces its lateral stiffness and calls for complicated work if waterproofing in watery ground is required.
The same source gives a description of a sectional monolithic wall in ground comprising prefabricated members having curvilinear longitudinal slots on end faces and concreted monolithic sections of the wall disposed between pairs of adjacent prefabricated members. The method for erecting such a sectional monolithic wall in ground involves digging a trench by a number of digging runs, installing prefabricated members with curvilinear slots on counteropposing sides at a distance from one another within each digging run and concreting the monolithic portions of the wall between the pairs of adjacent prefabricated members.
SUMMARY OF THE INVENTION
The main object of the present invention resides in improving the reliability of the wall by allowing it to take lateral bending moments and simplifying the manufacture of both prefabricated members proper and the entire wall.
This object is attained by the claimed design of the prefabricated members which go to make a sectional monolithic wall in ground, and by the claimed method for erection of said wall.
A specific design feature of the prefabricated member of a sectional monolithic wall in ground, consisting of a reinforcing cage and a concrete body with longitudinal curvilinear slots on end faces, lies in that said longitudinal curvilinear slots are offset towards one of the longitudinal faces of the concrete body and form projections of different thickness, said reinforcing cage being comprised of external sheet reinforcement disposed on the external surface of the longitudinal side of the concrete body at the side of the thinner projections, transverse bars extending in tiers through the height of the body and disposed at the longitudinal face of the body at the side of the thicker projections, and of bars intersecting in each tier at an angle and having bends at the ends which are welded at the side of thinner projections to the external sheet reinforcement while at the side of thicker projections they are secured to the transverse bars.
The prefabricated member of the sectional monolithic wall in ground may have a reinforcing cage provided with longitudinal prestressed reinforcing bars disposed between the bars intersecting at an angle, and an external sheet reinforcement.
The prefabricated member of the sectional monolithic wall may have a reinforcing cage whose transverse bars in each tier have their free lengths protruding beyond the limits of the counteropposed thicker projections and are offset from one another.
The prefabricated member of the sectional monolithic wall in ground may be provided with external sheet reinforcement having free lengths protruding from the concrete body for connection with the free lengths of the similar sheet reinforcement of the adjacent prefabricated members of the wall.
A specific design feature of the sectional monolithic wall in ground comprised of prefabricated members having curvilinear longitudinal slots on end faces and installed at a distance from one another, and concreted mon
REFERENCES:
patent: 4453366 (1984-06-01), Picagli
Urban Underground Transport Structures, L. V. Makovsky, pp. 1-15 (with English Language translation) (1979).
Erection of Structures Using "Wall in Earth" Method, Kiev (edited by D.Sc., Prof. A. L. Filakhtov), pp. 141-158 (1976) (with English language translation) (1979).
Antonov Dmitry V.
Makovsky Lev V.
Mikhailov Arkady J.
Pokladok Igor A.
Sedov Igor I.
Bagnell David J.
Nath Gary M.
Zege Sergei Olegovich
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