SU1249112A1 - Method of erecting a screw pile - Google Patents

Description

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The invention relates to the field of construction and can be used for the erection of supporting structures: structures intended for fixing structures in the ground.

The aim of the invention is to increase the efficiency of screw pile immersion.

FIG. 1 shows schematically a screw in the process of being immersed in the ground; a general view of FIG. 1 in FIG. 2 is the same in the working position; FIG. 3 shows the node 1 in FIG. one; in fig. 4 - locking device in the form of elastic linings, cut; in fig. 5 shows section A-A in FIG. 2

Screw pile, loaded by the described method, contains a hollow shaft 1, made of a composite of concentrically located shells - inner 2 and outer 3. Both 2 and 3 are equipped at the lower end with screw blades - and 5 of one direction of screwing and are installed with auto-rotation around the vertical axis and longitudinal movement relative to each other. The inner shell 2 at the lower end is made with a conical tip 6 and is provided with guide lugs 7. for fixing the shells 2 and 3 and concentric position. The blades of blades 4 and 5 are equipped with locking devices 8, which allow the blades to rotate in the ground in one direction and made in the form of plates 10 attached by means of a hinge 9 with a curvilinear longitudinal section, as shown in the form of flat stops 11 ( Fig. 1-3), or spring-loaded elastic pads 12 (Fig „4). In this case, the pads 12 are interconnected by pre-compressed springs 13, which are passed through the holes 14. The plates 10 and the pads 12 can be mounted in special niches 15 of the blades 4 and 5 (Fig. 3) or directly on the surface of the latter (Fig. 4). also top or bottom of the lop, stey „

The proposed method is carried out as follows.

At first, the inner shell 2 with a self-propelled auxiliary lightweight screwdriver (for not shown in the drawing) is ground into the ground for 4–7 turns. In this case, the plas2 .2

Tina 10 of the blade 4 is folded (pressed against the blade) and does not prevent the shell 2 from sinking. Then the outer shell 3 is put on the shell 2 until it stops in the ground, and the main device for immersion of the pile is mounted on the heads of the shell 2 and 3 (not shown) . When the outer shell 3 is subsequently screwed, the resulting reactive torque and axial force are transmitted through the immersion device to the inner shell 2. with the blade 4. Under the action of the reactive moment, the shell 2 tends to turn out of the ground, while the plate 10 of the blade 4 having a curvilinear longitudinal section cuts into the ground (opens) and, turning around the hinge 9 until the contact of the stop 1 1 with the blade 4, reliably anchors the soil of the inner shell 2. Reactive forces and through the blade 4 with the plate 10 is transferred to the ground.

Screwing the sleeved sheath, 3 with a blade 5, is carried out up to the stop of the lower end of the sheath 3 into the tail part of the blade 4 (Fig. 1), after which the sheath 3 is rotated in the opposite direction by reversing the drive of the immersion device. In this case, the plate 10 of the blade 5 is opened, producing the anchoring of the shell 3, and the plate 10 of the blade 4 is folded, turning around the hinge 9 until it stops at the blade 4, and the inner shell 2 is already screwed in with the transfer of reactive forces to the outer shell 3.

Then, the outer casing 3 is re-screwed and the new dipstick of the pile is repeated.

Thus, the immersion of the screw pile to the design mark is made in steps of 1-1.5 m, on each of which concentric shells 2 and 3 with blades 4 and 5 are screwed BajoT alternately, and during the period of screwing one of the shells the resulting reactive torque and axial force are carried out on a fixed second, anchored in the group by means of plates 10 and a helical blade. After the pile has been completely immersed, the outer sheath 3 is unscrewed until its plates 10 are opened, and the shells 2 and 3 are joined with a fastening bolt 16 (Fig. 2).

It is also possible that the inner casing 2 with a blade 4 is immediately immersed by a self-propelled screwing device onto the design mark, and then the outer casing 3 is screwed down using the main immersion device with the transfer of reactive forces to the inner stationary casing 2.

If there are more than three shells, after immersing the two inner shells, the remaining shells with blades are successively screwed in by one of the methods, and the transfer of reactive forces is carried out on the previously screwed fixed shells.

The initial immersion of the screw pile of the inner shell can be ensured without an auxiliary screwdriver by.

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ballast box, inside which the pile is installed and then sand-sand mortar is injected (not shown in the drawing).

5 In the case of the locking device 8 in the form of elastic linings 12, when screwing in, the soil is pulled apart and compacted, as a result of which the friction of the blades 4 and 5 on the soil is reduced, and when unscrewed due to the action of the compressed springs 13 and the subsequent ground rejection array, carried out the anchor of the blades.

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In order to facilitate the immersion of the screw pile, the screw blades of the shells should be made with one step, moreover, the structure of the surrounding soil massif is to a great extent disturbed.

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Editor N.Egorova Order 4206/29

Compiled by V.Tischenko

Tehred I.Popovich Proofreader V.Sinitska

Circulation 641. Subscription VNIIPI USSR State Committee

on affairs: inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, “Projectna St., 4

5 years

Claims (2)

1. METHOD FOR CONSTRUCTING A SCREW PILET with a barrel "of concentrically spaced shells, each of which is provided at the lower end with a screw blade of one direction of screwing, including separate screwing of concentric shells into the ground, characterized in that, in order to increase the efficiency of the Piling, before screwing or in the process of screwing each of the subsequent shells, the previous shell is locked in the ground by unscrewing it and transmit to it the reactive torque that occurs when screwing and axial force. 2. The method of pop. 1, characterized in that the shell of a smaller diameter is first screwed into the ground, and when each <5 of the next shell is screwed, the shell of a smaller diameter is locked. SU „„ 1249112 A1