SU1460114A1 - Forms for constructing asphalt-concrete diaphragm in earth dam - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to increase the antifiltration reliability of the diaphragm, accelerate the pace of its construction and reduce the cost of work. The formwork for the erection of an asphalt concrete diaphragm in a dirt dam is made in the form of formwork panels 1, united by a plate 3 and forming a U-shaped profile. It is equipped with tubular elements that are affected by a vibrator mounted either inside these elements or directly on the plate. The position of the formwork is adjusted by means of eccentric stops 8, inserted into vertical slots, which, when the formwork is lifted, are retracted inside it by pressing them with soil and pivotally attached to the inside of the shields 1. The soil is compacted around the formwork by successive vibrator passes. 2 hp ff, 6 ill. (L

Description

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The invention relates to the construction and can be used for the construction of an asphalt diaphragm in a dirt dam.

The aim of the invention is to increase the anti-filtration reliability of the diaphragm, accelerate the pace of its erection and reduce the cost of work.

FIG. 1 shows the formwork, general view; in fig. 2 - the same, top view; in fig. 3 is a section A-A in FIG. one; in fig. 4-6 are simplified cross-sectional images A-A in FIG. 1 at various stages of operation / in FIG. 4 - formwork in the initial stage of work, when the formwork is set one after the other along the axis of the diaphragm with some penetration into the underlying soil layer; in fig. 5 - the same, at the moment when the sequential passes of the vibratory roller (conventionally shown) of the soil, laid on both sides of the formwork flush with its top, are compacted; in fig. 6 - the same, at the moment after zapivka asphalt concrete mix and after lifting the formwork to the next Russian).

The formwork is arranged as follows.

Shuttering boards 1 with vertical slots in them with rectangular brackets 2 are rigidly attached to the slab 3, the slab 3 is provided with a shock absorber 4, executed in the form of an elastic coating. In the slab, there is also a complete hatch 5 with a lid 6, and a metal structure 7 of horizontal tubular elements is attached to it at the bottom. The brackets 2 are equipped with lugs 8, which are made of sheet metal and are eccentrically suspended on the brackets hingedly so that the protrusion 9 the account of the displacement of the center of the body and its weight entered the slot of the shield 1 and protruded beyond its limits when the formwork was raised. The panels below are covered with metal sheet 10. The formwork at one end is provided with a jumper 11 and flaps 12. Plate 3 is also provided with loops 13 for lifting the formwork with a lifting means. On the plate can be installed vibrator 14 (for example, in the form of a roller vibratory roller).

As an option, the tubular elements are supplied with vibrators, which,

0

5 0 5

about

five

Q 5

50

ti inside these elements (not shown).

The construction of the asphalt diaphragm using the proposed formwork is carried out as follows.

The formwork is set one behind the other along the axis of the asphalt concrete diaphragm with some penetration into the underlying soil layer (Fig. 4). Then, the soil is laid, leveled to the level of the top of the formwork and compacted. Soil compaction near the formwork is performed by successive passes of the vibrator 14, made in the form of a vibratory roller, along the formwork and along the ground of the transition zone along the axis of the diaphragm (Fig. 5). At the same time, the formwork, having fallen away with the soil being compacted, forms the wall of the trench from dense soil. After compaction, the casting of asphalt concrete inside the formwork is carried out. After the asphalt concrete is poured, the vibratory rollers again make several passes through the formwork. In this case, the vibration from the roller of the roller is transferred to the slab 3 and the metal structure 7 attached to it, and from it an asphalt concrete mixture. In this case, there is a more intense release of air from the mixture involved in it during the preparation process, which increases the imperviousness of the diaphragm. Shock absorbers 4 prevent plate 3 from being damaged by the dynamic action of a vibratory roller. When the tubular elements are equipped with vibrators, they are made for a short time (1.0-1.5 minutes) after being filled with the formwork with the mixture. Additional filling of the vibratory roller after filling with the mixture is not necessary. Vibrating the mixture contributes to the accelerated release of bubbles of entrained air until the asphalt concrete thickens and hardens.

Then the lifting means raise the formwork to the height of the next layer (Fig. 6). At the same time, at the beginning of the ascent, the eccentric stops 8, under the action of the soil pressing on them, turn and the stops retract inwards through the slit in the wiring 1. When the vertical chips (slots) and shields are above the ground surface, the protrusions of the 9 stops under the action g By the power of the force of the metal

one

Claims (3)

1. Formwork for the construction of asphalt diaphragm in the ground ten 01 about 5 five 144 dam, including shuttering shields connected by bridges, characterized in that, in order to increase the diaphragm’s impervious reliability, speed up its erection and reduce the cost of work, the shuttering shields are combined with a slab, forming a U-shaped profile, on top of which is placed a shock absorber made from an elastic coating, and inside the structure, tubular elements are rigidly attached to the slab, with vertical gaps in the shields, blocked by eccentric stops hinged to the inner sides e these shields.  I 2. Formwork according to claim 1, characterized by the fact that vibrators are placed inside the tubular elements. 3. The formwork according to claim 1, that is, so that the vibrator is mounted directly on the formwork plate. Fmg.2 Fi, GL FIG. five FIG. 6