SU966163A1 - Method of producing cast-in-place piles - Google Patents

Description

The invention relates to the construction of) and can be used in the construction of foundations from ramming piles, manufactured in wells, formed by ramming.

A known method of manufacturing short ramming piles includes the operations of forming a well with a drummer, filling the well with a building material with simultaneous compaction

his Cl.

The disadvantage of this method is the increased consumption of building materials for the formation of piles due to different levels of wells due to the heterogeneity of the soil .;

The closest technical solution to the invention in its essence and the achieved result is a method of producing stuffed piles, including the formation of wells with an inventory drummer with an oblique generator, filling the wells with building material and sealing it with a blow 2.

However, in the production technology of piles according to this method, as the hammer is immersed at different depths, bedding and wrinkling of portions specific to all the piles are performed.

cheaper building material (gravel, crushed stone, soil), due to the improved properties of the base and a corresponding increase in the carrying capacity of each foundation pile.

Due to the fact that the geological engineering conditions of any construction site are diverse and heterogeneous, using a known method

10 and at the same time ensuring the increased bearing capacity of each pile cannot ensure the same bearing capacity and deformability of the pile foundation. Since the load

The 15 ki from the structure on the pile are assigned according to the test tests of the piles and with a certain 11 high safety coefficient and apply to all the piles of the foundation,

20 then there is an underutilization of the bearing capacity of the base.

The aim of the invention is to more fully utilize the bearing capacity of the pile foundation by equalizing its resistance.

This goal is achieved by the fact that in the method of producing printed piles, including the formation of wells by an inventory drummer with an inclined

Claims (2)

30, filling the wells with a build-up material and sealing it with a blow, before starting the formation of wells under the piles, in places with the highest strength characteristics of the soil is formed with the help of a drummer 5-7 test wells, counting the number of impacts appropriate depth and to the design, then, according to these data, build a control schedule and proceed to the production of ramming piles, and during the development of a squash pit under a rammer pile, at each control level t check the correspondence of the actual number of blows with the number of blows during the formation of test wells according to the schedule and by their divergence determine the amount of backfill, backfill with local soil and continue the operation for the formation of wells, and the operations are repeated at all control levels until until the well is reached. The proposed method is carried out as follows. For the manufacture of wells and piles an inventory drummer of square section is used from the side of the square along the bottom of the hatch, along the top of the dp and the length L. In the places with the highest strength characteristics of the soil, test wells are formed in an amount sufficient for static treatment (for example, 5-7 wells), while recording the number of strokes and the depth of the dip. Based on these data, a control graph is constructed, representing the external envelope Np, Q-) t and the statistical curve I CN + лN) (1) depending on the magnitude of the impactor’s depth (N: arithmetic average of the number of blows during the formation of test wells; uN is the standard deviation; 1 is the current immersion depth of the striker). With the formation of test wells and wells under the piles, the volume of the well varies as a function of 1 and is: е-т (.а:; Е а when penetrating to a depth of L i. 1 (+ с1нс1в)) The graph is constructed by the formula (1 Fig. 1 shows a generalized control chart of the number of beats as a function of depth (1), which is either the external envelope or lib. Built on the results of statistical processing of N f (1) graphs obtained when test wells were formed; Fig. 2 - the schedule (2) of the well volume change ON the depth V (1) - 2 in Fig. 3 are combined the control schedule (1) and, in fact, th schedule (b) depending on the number of blows in depth for a well under the i-th pile, as well as a corrected schedule (4) of the number of blows after filling certain portions of soil at control levels. Thus, when a hammer dives when a well is formed, Under any pile on the control level, the difference in the number of impacts between the control schedule (1) and the actual (3) is L. It moved the intersection point of the actual schedule (3) (1) to the control, and then to the schedule (2), find the volume of filling in dense tele remote control A portion of u.V. Further, continuing to tamp the well to the next control level, graphN (1) .; will occupy some intermediate position between the control (1) and actual (3) graphs. When the striker reaches this control level, the difference in the number of blows between the control (1) and the corrected (4) graphs is A N jj. Committing to building similar to those considered, on. The volume of local construction material .bVg is moved at the second control level. After completing the backfilling operation, we continue drilling the wells to the next level of correction and again, using the difference in the graphs (1) and (4) CuN (j;), determine the value of the new portion of soil l N, fall asleep into the well and continue cutting to the design depth. Upon completion of the leveling operation of the base resistance, carried out simultaneously with the formation operation, the well is filled with building material, such as concrete, which is then compacted. Control Levels and their number should be assigned depending on the depth of the well, geotechnical conditions, directing them to the boundaries of the soil layers and as evenly as possible, for example, two meters. The present invention allows an increase in the bearing capacity of the base. This ensures the same bearing capacity and deformability of the base of each pile and, accordingly, uniform deformation of the entire foundation of the object. The invention method for the production of ramming piles, including the formation of wells with an inventory drummer with an oblique generator, filling the wells with building material and sealing it off. rum, different in that. that, in order to more fully utilize the bearing capacity of the pile base by leveling its resistance, before starting the formation of wells under the piles in places with the highest strength characteristics of the soil, they form 5-7-7 test wells with the help of a drummer, counting the drummer to the appropriate depth and rio of the project, then from this data a control schedule is constructed and proceeds to the fabrication of reel piles, and when a well is being formed under the stuffed pile and each reference level is produced by t corresponding to the actual number of strokes with a number of strokes during the formation test wells. according to the schedule, and according to their discrepancy, the amount of backfill is determined, local ground is filled up and the well formation is continued, and the operations are repeated at all control levels until the design level of the well is reached. Sources of information taken into account in the examination of 1 Pataleev A.V., Bozhenkov S.Ya. Mechanics of soils, foundations and foundations, part II. M., Transzheldorizdat, 1943, s, 93. 2. Brenneke L., Lomeyer E. Foundations and Fundamentals, t. H, gosstroyizdat, 1933, p. 188-189 (prototype). )