SU1710656A1 - Earth dam with antiseepage member - Google Patents

Abstract

The invention relates to hydrotechnical construction and can be used in the construction of earth dams with a diaphragm of reinforced concrete elements. The purpose of the invention is to increase the reliability of the dam while reducing its cost and construction time. The dam includes tel. O 1, diaphragm 2. fixed in the body of the overflow bridge 8. on the crest of which plate 9 is placed. The diaphragm consists of precast reinforced concrete plates 3, between which the supporting and sealing beams are laid in such a way that in the first case deformation nodes 6, and in the second - structural nodes 7. In the deformation node in the beam itself, there are through holes for the passage of bitumen material, which is filled with a groove between the plate and the ball. Moreover, the entire length of the plate at the bottom | wedges are made in the knot edge in the knot zone to prevent soil from entering the zo | \ groove. The length of the plate separated by seams. Under the diaphragm, cementation is carried out on a curtain of 15.5 il. ^ NSPU < ^ ag.1

Description

The invention relates to hydraulic construction, in particular, to structures of earth dams with a diaphragm of reinforced concrete elements, erected, including, in harsh climatic and hard-to-reach conditions.

The purpose of the invention is to increase the reliability of the diaphragm while reducing its cost and construction time.

Figure 1 shows a dam, a transverse section; figure 2 - deformation node of the diaphragm; Fig, 3 - structural node of the diaphragm; 4 and 5 show, respectively, variants of rigid and flexible cuts of lateral vertical seals of the diaphragm plates.

A ground dam with an anti-filtration element includes a body 1 and an anti-filtration diaphragm 2 consisting of precast concrete slabs 3. Support 4 and sealing 5 beams are laid between the plates in such a way that in the first case deformation nodes 6 are formed, and in the second - structural nodes 7. The diaphragm is fixed in the body of the overflow bridge 8, on the crest of which a support plate is placed 9. In the deformation node in the beam 4 there are holes through holes 10 for the passage of bitumen material 11, with which the gap 12 is filled in plate 3 and the beam 4. Moreover, the entire length of the plate at the lower edge in the zone of assembly 6 made lean-13 to prevent ingress of soil in the zone of the slot 12. Along the length of plates 14 separated by the seams (4 and 5). A cementing curtain 15 is made under the diaphragm. The sealing of the plates consists of half an I-beam 16 and angles 17 (figure 4) and guide elements 18 of the template from pipes 19 (figure 5).

When the earth dam 1 is operated with a diaphragm 2 freely supported on the foundation, the individual reinforced concrete slabs 3 perceive the loads determined by the difference between the hydrostatic pressure and the active pressure of the soil of the upper prism and the active pressure of the soil of the lower prism.

The vertical compressive loads acting on the diaphragm are its own mass and friction force of the soil NT, the persistent prisms along the surface of the prism diaphragm, the latter (with a filled reservoir equal to

NT - Ев f 1 + (Ен + Ер) f2, where ЕВ, ЕН - active lateral pressure of the soil, respectively, of the upper and lower prisms of the dam;

E (- reactive pressure of the soil, lower prism, caused by the displacement of the diaphragm;

fi and f2 - friction coefficients of the ground

riding and lower prisms.

As a result of active operational loads, the diaphragm undergoes displacements in deformation 6 and structural 7 nodes in the direction of lower

prism. In this case, the movement of the diaphragm 2 is ensured in the deformation nodes. But since it consists of separate plates 3, separated by height, the diaphragm does not experience stress concentrations both within the collecting element and in the deformation 6 and lateral vertical 14 nodes.

To eliminate the lateral verti- and chalic sutures of the expanding diaphragm

stresses it is possible to perform it with a bulge in the direction of the upstream.

The deformation assembly 6 is a reinforced concrete I-beam, the upper part of the recess

which is designed so that the concrete element can be rotated at a certain angle, as well as displaced perpendicular to the axis of the dam. For this, a metal sheet is fixed at the base of the upper part, and the base of the elements 3 is covered with bitumen. The space between the slab 3 and the walls of the recess is filled, for example, with cast asphalt mastic, which, under the lateral pressures of the soil, is fluid.

The lower part of the node is

recess in which the plate is fixed

3 upper end coated with bitumen. AT

the gap formed through the hole 10

Litas asphalt paste is pressed. Therefore, both the upper and lower parts of the deformation unit ensure the necessary impervious properties.

The tightness of the assembly 7 is ensured by any kind of flexible material, since the assembly is rigid and its necessity is dictated only by the maximum possible dimensions of prefabricated elements.

Claims (1)

Invention Formula A soil dam with a profilfiltration element, including upper and lower prisms, transitions (zones and a diaphragm fixed in the body of the overflow bridge and made in the form of a wall of transversely placed sections, is characterized by the fact that reducing its cost and timing construction, sections are made of precast concrete slabs, between which alternately in height there are support and sealing beams of I-section, forming respectively deformational and structural units, with 5 in the deformation nodes the space between the support beam and the plates are filled it is not waterproofed, and in the structural units the space between the sealing beam and the plates is filled with a flexible material, and the deformation assembly is made in the form of a hinge joint, with through slots in the supporting beam. i-xv rv /, Phage. J   /..H and