RU2011741C1 - Method for construction of deep fissure drainage - Google Patents

Abstract

FIELD: ground drainage. SUBSTANCE: during excavation of ditch, formed hollow is filled with solution based on modified starch. Level of starch solution is maintained at the day surface. EFFECT: higher efficiency. 3 dwg

Description

 The invention relates to the field of drainage of soils and the elimination of the harmful effects of groundwater by lowering their level and can be used, in particular, in the construction of drainage in a built-up area.

 A known method of building drainage, including the development of a trench with vertical walls, removing the developed soil outside the trench and filling it with filter material.

 The development of the trench in this method is carried out by separate grips, each of which is isolated by vertical tubular elements while filling the gripper with water. After that, the grab is alternately backfilled with soil and filter material, and a tubular separation element located on the side of the previous gripper is removed, while the filter material is fed into it.

The disadvantages of the method:
- the trench snatches are taken out under the protection of water, the level of which must constantly be higher than the groundwater level (static level) by at least 0.5 m to avoid collapse of the vertical walls of the trench, for which it is necessary to build Forshakhta. The use of water leads to the fact that the development of the trench can only be carried out by grips, and with the use of dividing tubular elements (dismantling of which complicates and lengthens the process of developing the trench;
- with large coefficients of soil filtration, a constant supply of a large amount of water is necessary, since water very quickly goes into the reservoir;
- alternately filling the trap with soil and filtering material leads to clogging of the filtering material in the vertical and horizontal planes, which leads to a decrease in the efficiency of the drainage, a decrease in the flow rate of the drainage, and, therefore, to a reduction in the service life of the drainage system.

 The presence on the industrial sites of buildings up to 500 m long parallel to the horizontal, as well as on-site transportation tracks, railway embankments, buried building structures (foundations, basements, pile fields), etc. leads to a partial transfer of surface runoff to underground and to replenishment of groundwater reserves - raising the level of groundwater. As a result of changes in the water regime, basements are flooded. Especially dangerous is the flooding of basements in which technological equipment, devices, materials, etc. are located.

 To improve the hydrogeoecological and engineering geoecological situation, reduce groundwater levels and protect against flooding of underground structures, especially in cramped conditions in built-up areas, it became necessary to use a method for constructing deep-hole slotted drainage to a depth of 5 m or more.

 The purpose of the invention is to increase the efficiency of the drainage.

 This goal is achieved by the fact that the method of constructing deep slotted drainage drainage includes the development of a trench with vertical walls, which is carried out under the protection of a modified starch solution, removing the developed soil outside the trench and filling it with filter material. The modified starch solution clogs the walls of the trench, holding them in a stable position, and prevents the outflow of flushing fluid into the reservoirs. The level of the modified starch solution (flushing liquid) can be at the same level with groundwater or even lower than it, which does not require the construction of a mince. After a few days, starch self-decomposes, completely restoring the structure of the soil and thereby increasing the flow rate of the drain.

 Comparison of the proposed method for constructing deep slotted drainage drainage with the prototype revealed the following distinguishing feature: "the development of trenches... Are protected by a solution of modified starch...." This allows us to conclude that the proposed technical solution has novelty.

 The sign "the development of trenches... Lead under the protection of a solution of modified starch" provides an increase in the effectiveness of the drainage and, therefore, it is significant.

 In FIG. 1 shows a diagram of fragments of a trench; in FIG. 2 is a diagram of filling a trench with filter material; in FIG. 3 - section of the finished trench.

 The method is implemented as follows.

 A fragment of the trench 1 is produced by the working body 2 of the digging machine continuously, with its constant filling of the modified starch solution 3, through the supply pipe 4. The solution consists of water and modified starch (according to TU 10-04-08-64-87 or TU 18-8- 14-86), prepared at the construction site. The level of the modified starch solution 3 is constantly maintained at ground level 5. The modified starch in the solution collects the vertical walls of the trench, thereby preventing their collapse, and reduces the absorption of the solution by the soil.

 Upon reaching the design level, the trench is filled using a petal grab 6 with filter material 7, in particular a sand-gravel mixture that meets the requirements of SNiP 2.06.14-85 adj. 2, p. 21-23. Modified starch self-decomposes after a few days, completely restoring the soil structure, which improves the conditions for the influx of water to the drain, which means it increases the effectiveness of the drainage.

 Using the proposed method for constructing deep slotted drainage drainage can significantly increase the flow rate and service life of the entire drainage system through the use of modified starch, as well as carry out the construction of drainage in the cramped conditions of built-up areas, since the construction site with a minimum width is required for the construction of the entire drainage system equal to 6 m (the width of the digger plus the width of the access roads), to remove the developed soil, regardless of the depth trench.

 The proposed method of constructing a drainage allows one to practically not limit the depth of its laying, and the use of a sand-gravel mixture as a filter material increases the maintainability of the drainage system in the event of its claying (colmatage).

Claims (1)

 METHOD FOR CONSTRUCTING DEEP-CRITTED CRACKED DRAINAGE, including the development of a trench with vertical walls, followed by removal of the developed soil beyond the trench and filling it with filtering material, characterized in that, in order to increase the efficiency of construction of drainage by colding the vertical walls of the trench and increase the service life, simultaneously with by laying a trench, the developed soil is replaced with a solution based on modified starch, while the level of the solution in the trench is constantly support at the level of the surface of the earth.

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