SU1689514A1 - Ground anchor - Google Patents

Description

The invention relates to the implementation of ground anchors. The purpose of the invention is to increase the carrying capacity of the anchor. Ground anchor includes placed in

well 1 thrust 2, installed in the injection tube 3, tip 4, anchor seal 5 and filling 6 in the zone of free seal of the anchor. The thrust is made with a thickening 7. which is located in a glass formed by the contour walls 8 on the tip. Filling is a bulk material, the fraction of which is larger than the natural soil of the walls of the well. A conical head 9 is made at the lower end of the injection tube. The angle when the AERA ^ is not 90 ° - φα, where <pj is the angle of internal friction of the well filling material in the zone of free sealing of the anchor. 2 Il.

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The invention relates to the construction and relates to the implementation of ground anchors designed to transfer tensile forces to the deep layers of the soil when attaching delays of high supports, masts of power lines, antenna fields, while fixing structures buried beneath the horizon of groundwater from ascent, to build new walls reconstruction of existing structures.

The purpose of the invention is to increase the carrying capacity of the anchor.

FIG. 1 shows the anchor before bringing it to the working position, longitudinal section; in fig. 2 - the same. in working position;

A ground anchor consists of 1 thrust 2 placed in a well, placed in an injection tube 3, a tip 4, an anchor seal 5 and a filling 6 of a well in the zone of an anchor free seal. Traction 2 is made with a thickening 7, which with the possibility of axial movement is placed in a nozzle glass formed by contouring walls 8. Filling is a bulk material, the fraction of which is larger than that of natural • soil of the well walls. At the lower end of the injection tube, there is a conical head 9, the angle at the top of which is 90 ° C, where <r3 is the angle of internal friction of the filling material.

The anchor is as follows.

Well 1 is passed to a predetermined depth, into the well. The injection tube 3 with a conical head 9 and thrust 2 with a telescopic head formed by thickening 7 and tip 4 are installed in the assembly. Well 1 is filled with filling material 6 of a larger fraction than the natural one. The injection tube 3 with a conical head 9 is pulled out and at the same time cement mortar is injected through the injection tube 3 under a given pressure to form the anchor seal 5, and a compacted soil zone 10 is formed around the working part. After hardening the cement mortar, the anchor is tensioned onto the structure, while the tip 4 remains in place, and the thickening 7 moves in the glass within the height of its walls 8, as a result of which the movement of the stressed ground into the cavity formed under the surface scheniem traction by pulling the latter.

When the injection tube is pulled out due to the wedging action of the conical head, the soil is compacted along the entire length of the working part, and the layer that is in contact with the surface of the working part is a soil with improved properties compared to the natural one due to filling the material with a larger fraction. The conical head at the end of the injection tube provides the best conditions for soil compaction around the working part, since the movement of particles of the filling material will occur along the normal from the cone surface in the direction of the formed slip lines to the natural soil along the shortest path, thus reducing the drawing force by reducing the coefficient friction from the value of TduTz to the value of td5, where 5 is the angle of friction of the soil on the metal of the tapered head, equal to

In addition, the pressure of the cement slurry is reduced, which is transmitted to the base of the cone head when the solution is injected into the working section. After extrusion of the injection pipe. The length of the working part and the simultaneous injection of cement mortar under a predetermined pressure forms the body of the anchor seal, which has a diameter greater than the diameter of the well. At the end of hardening of the cement mortar when the anchor is tensioned onto the structure, the drag of the anchor will be realized over an area with an outer diameter equal to the diameter of the working part of the anchor. Since the diameter of the working part of the anchor exceeds the diameter of the conical head, when the anchor is tensioned, a compacted soil cone forms in the frontal part with a curvilinear generatrix extending to the working part of the anchor at the top and to the top of the conical head at the top. Realization of the lateral surface shear resistance occurs in the contact layer of the soil compacted to the maximum possible density with a friction coefficient equal to tduya.msks, where w ^ max.max is the maximum possible value of the angle of internal friction of the filling material. All of the above provides an improvement in the quality of work on the device.

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anchor, increasing its carrying capacity and production reliability.

Claims (1)

A soil anchor comprising well-bore traction, a pointed lost tip, an injection tube in which a thrust is installed, anchor embedment of injectable hardening material and a bore filling material in zone 10 of the free embed draft that deflects that, in order to increase the carrying capacity of the anchor, the filling material consists of disconnected !, fractions with a larger particle size than the natural soil of the borehole walls, the injection tube at the lower end is made with upwards with a cone head for sealing the filling material, the angle at the apex of the cone head being a = 90 ° - <ps, where a-angle at the top of the conical head: φζ - the angle of internal friction of the material filling the well in the free zone traction termination while the tip is made with the contouring walls forming the cup, and the thrust is with a thickening at the lower end placed in the cup of the conical cup with the possibility of axial movement within the height of the cup. UA AT 4 ί 1