SU1097744A1 - Method of preparing foundation of hydraulic structures on weak soils - Google Patents

Abstract

1. A METHOD FOR PREPARING A BASIS FOR HYDROTECHNICAL STRUCTURES ON WEAK APPLATES, including a fragment of a pit with a subsequent reverse layering and formation of an anti-absorption screen between its layers, in order to reduce the permeability and deformability of the patterns of the patterns of the patterns and the patterns of the patterns and the patterns of the patterns of the patterns and the level of the patterns and the patterns of the patterns and the level of the patterns in the patterns of the flat patterns. pneumonic sprinkling of the primer-silicate mixture along the slopes and bottom of the pit, as well as on the outer surface of the backfill soil with the formation of a lock the skin of the shell, and before the pneumatic spraying, all surfaces are treated with a roller with spikes followed by watering with a solution of silicate .. part 2. The method according to claim 1, l and l and n, and with the fact that under the base drainage with waste water in collections. QO 4 ;: 4

Description

The invention relates to a hydraulic engineering and water supply construction and can be used in the preparation of bases for the erection of hydraulic structures and water utilities for various purposes on weak soils. A known method of preparing bases for hydraulic structures on weak soils consists in extracting a boiler on and subsequent reverse layering of local soil in it with wetting and compaction of each Cl layer. However, this method does not ensure the creation of a sufficiently reliable base, the carrying capacity of which decreases due to constant water filtering into the soil below the bottom of the pit. The closest to the invention is a method of preparing bases and technical structures on weak soils, including a passage of the pit, followed by a reverse hollow dumping and the formation of an anti-filter screen C 2 between its layers. The disadvantage of this method is that, with repeated freezing, the scientific research institute bentonite clay, from which the impervious screen is created, cracks. In addition, benton clay is often not local soil, and. there are difficulties associated with its delivery. The aim of the invention is to reduce the water permeability and the base deformability and increase the stability and reliability of the structures. The goal is achieved by the fact that the anti-filtration screen forms a soil-silicate mixture by means of pneumonic spraying along the slopes and bottom of the excavation, as well as on the outer surface of the soil of the backfill with the formation of a closed shell, and before the pneumonab rozg all surfaces are treated with a spiked roller, followed by watering with a solution of silicate. In addition, if necessary, a double-sided drainage is arranged with a base with water drainage to collections. In this way, in the base of the structure, a closed waterproofing, waterproof and heat-proof cushion is created, which eliminates subsidence deformations and swelling of the base. FIG. 1 depicts a compacted silicified screen, closed along the contour, with back filling of the sinuses; in fig. 2 - the same, with an additional two-level drainage; in fig. 3 - plan of the pit. The method is carried out as follows. Prior to opening the excavation trench 1, the vegetative soil layer is removed from the base. Ditch 1 is torn to the design elevation with an excavator or scraper. The soil is stored in the dump along the sides of the pit. The base of the excavation and the slopes are covered with a spiked roller (for 1 m there should be 100-200 spikes 15-20 mm deep with a rounded or pointed track. Then the base is coated with a sprayed aqueous silicate solution, 09 g / cm, which accumulates in the grooves of the spikes and impregnates the ground of the base.Then, an anti-screening screen 2 is arranged using the method of pneumatic spraying of a mixture of local soil with cement, silicate (1%, L% to cement) and iron vitriol (1.5%) .The thickness of the screen (35-50 mm / depends on character groundwater (composition and level). Screen 2 is arranged by cards from one edge to another, and then the cards are laid in a soil pit with layers 3 by backfilling 40-50 cm soaked with a solution of silicate (, 09 g / cm) by compaction to 1.7-1.75 g / cm. After dumping the soil to the design elevation of the foundation of structure 4 or the structure itself, the upper layer is leveled, also rolled with a studded roller and covered with a filtration barrier screen 2 (Fig. 2), creating a closed base for the construction, which evenly distributes the load on the underlying soils 5. The surface screen can be laid with a slope and buried under backfill b (Fig. 1), which in turn is sealed by a bulldozer with a preliminary head affection. In case of strong and frequent precipitation, if necessary, a two-level drainage drainage is arranged under the base .7 into two, reciprocally perpendicular directions with water drainage to collections 8 (Fig. 2). After installing the foundation / screen, it can mate with the vertical planes of the foundation of the structure (Fig. II. The proposed method of preparation of the foundations allows building objects in complex hydrogeological conditions, creates a non-flowing and non-subsurface base, as the soil is protected from wetting as well as and from freezing. Construction time is reduced. The process of preparing the base is not labor-intensive, does not require large amounts of water (soil moisture can only be brought up to 10-13%). after

1 year of operation, the overhaul period is increased. All this brings a significant national economic effect. For the device of screens, local soil is used, for example, soil-cement mixtures, soil-bitumen-emulsion mixtures with the addition of cement, soil-polymer cement, soil silicates. These compounds create a waterproof screen with special additives.

The economic effect from the introduction of the invention is 1.5 thousand rubles per one building.

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Claims (2)

1. METHOD FOR PREPARING THE BASIS OF HYDROTECHNICAL STRUCTURES ON WEAK SOILS, including a fragment of the excavation pit followed by backfill layer by layer and the formation of an antifiltration screen between its layers, characterized in that, in order to reduce the water permeability and deformability of the base and increase the stability and Reliability of structures, the antifiltration screen form a pneumatic spray of the silicate mixture along the slopes and , as well as on the outer surface of the soil backfilling with the formation of a closed shell, and before air spray all surfaces of the image batted with a roller with spikes, followed by pouring with a solution of silicate .. 2. The method according to π. 1, due to the fact that under the base they arrange two-tier drainage with water drainage into the collectors.