SU1476042A1 - Method of constructing counter-seepage lining of slopes from prefabricated ferroconcrete panels - Google Patents

Abstract

The invention relates to the field of construction of anti-filtration lining of slopes of irrigation and water management canals. The purpose of the invention is to increase the stability of the plates on the slope. The method includes laying 1 on waterproof gaskets 2, ensuring the continuity of the underfilled void. Then, construction of recesses for the anchors is carried out in a vertical position along the interplate joint. The reinforcement connection is made of 5 anchors with reinforcement 6 seams and concreting of the seam and recesses. After the concrete has hardened, a hardening antifiltration solution 12 is injected into the lower hole until it appears from the upper holes. 2 Il.

Description

F.Ch. 2

The invention relates to the construction of antifiltration cladding of slopes of irrigation and water canals, in particular, from prefabricated reinforced concrete slabs of the type NPK.

The purpose of the invention is to increase the stability of the plates on the slope.

FIG. 1 shows a fragment of the facing of three plates; in fig. 2 - anchor articulation unit with adjacent plates and longitudinal reinforcement of the joint cavity.

Reinforced concrete slabs 1 with beveled edges are placed with their lower edges on tape waterproof elastic gaskets 2, previously placed on the slope 3 longitudinally along the axes of interplate gaps. The thickness of the gaskets 2 is chosen according to the condition of ensuring the continuity of the subfilled void and the layer of injection solution over the entire area between the gaskets. The distances between the edges of the adjacent plates are chosen equal to the diameter of the holes 4 under the anchors. Deeper 4 under the anchors arrange in the intervals between adjacent plates facing slope in an upright position. The armature 5 of the anchors is connected with the longitudinal reinforcement 6 of the butt cavities and the concrete anchors 7 and the spaces between the plates 8, the shoulders 9 and the bottom 10 are concreted. After the concrete has hardened through the bottom technological holes 11 under the plates, they press the hardening anti-filter solution 12 voids at the exit of the solution from the upper hole 13.

The pressure of the injection is prescribed according to

Rkag

s ™

, + QaH + nl, f. (L T +

m

+ ld T "g

g

de P is injection pressure, Pa;

50

naked

S DD - the area of the central plate, m2;

K - safety factor (1.15); m is the coefficient of laying the slope of the cladding; GS Q PL is the sum of the masses of the central and two halves of adjacent plates

one

one

3rd night + 2 2)

plate resisting, H;

p - the number of anchors on the central plate, pcs; QaH is the mass of the anchor that resists plate lifting, H; C, - dimensionless coefficient

(for loam equal to 0.7); fH - normative (limit)

soil shear resistance in the anchor zone, Pa; 1 - anchor length, m; d is the diameter of the anchor, m; С - uniformity coefficient

base soil 0.7; R is the normative (limiting) resistance of the base soil, Pa.

The value of the discharge pressure is also corrected by the bearing capacity of the anchors (according to the reinforcement) according to

 -0.001 With RaF

yp "

a an)

where C is the coefficient of working conditions, taking into account the uneven transfer of the load on the reinforcement, taken to be 0.6; Rq is the design resistance of the anchor reinforcement, Pa; Fa - cross-sectional area

anchor reinforcement, m2; p - the number of anchors of the central plate, pcs.

The use of waterproof elastic gaskets under the lower edges of the plates provides a guaranteed volume and continuity of the underfilled voids, and hence the continuity of the layer of injection solution over the entire area between the gaskets, shoulders and monolithic concrete of the bottom of the channel, as well as more densely supported edges of the plates on the base . In addition, the thickness of the gaskets correlates the thickness of the layer of the cement solution to the particle size distribution of its inert aggregates. Placing anchors in the intervals between adjacent plates with beveled edges will make it possible to use, in addition to the mass of the central plate, the mass of adjacent plates (2LQ "l) FOR resistance to lifting when the solution is injected and to increase the stability of the facing during the operational period. Improving stability contributes to the communication of ar-

mats of interplate clearances and anchors and their joint monolithing, and the vertical placement of anchors in a sloping base will allow an anchor to be pulled out by pulling out a portion of the soil in its zone.

Claims (1)

Invention Formula The method of construction of antifiltration cladding of slopes of precast concrete slabs, including the laying of slabs made with the slopes of adjacent sides with technological holes diagonally, fixing them to the slope by installing reinforced anchors buried in the soil, and after hardening the anchors solution and joints applying an impervious solution by injecting it into the lower hole before exiting the upper one, characterized in that, in order to increase the stability of the plates on the slope, the latter are placed on the elastic elastic strip pads pre-laid on the slope along the axis of the joints; over the entire area of the plate between the gaskets, and the recesses for the anchors are arranged in the interplate gaps in the vertical position, with the armature of the anchors connecting dissolved with fittings previously laid along the seam over the entire length of the slope, and concreted together.  - V H - x v v - N } / /; r-vs /; / t J / figure 1