SU796312A1 - Method of fitting anchors - Google Patents

Description

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The invention relates to construction and can be used to install anchors with a transverse element at the end in rocks or concrete massifs.

There is a known method of installing anchors in rock formations or concrete massifs by drilling wells, placing the anchor in the well, and filling the well with cement and mortar followed by compaction ij.

However, due to the small gap between the anchor and the walls of the well, the process of pouring the cement-sand mortar and its compaction in the well is difficult, and there is also no way to effectively monitor the quality of the casting, which causes an insufficiently large bearing capacity of the anchors.

The closest to the present invention is a method of installing anchors with a transverse element at the end, in rocks or concrete masses by drilling a number of wells isolated from each other, placing anchors in them, filling the wells with a concrete mixture and then vibrating it. To increase the bearing capacity, additional anchoring elements are introduced into the well, for example, reinforcing meshes or wedges 2.

However, the carrying capacity of the anchors installed by this method is also not high enough, due to the inability to carry out an effective vibration effect for compacting the concrete mix in the well due to the placement of the anchor itself in it, as well as the ability to monitor the quality of the filling of the well.

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

The goal is achieved by the fact that in the method of installing anchors with a transverse element at the end, in rocks or concrete massifs, including drilling wells, placing anchors in them and filling the wells with concrete mix and subsequent vibrating compaction, on both sides of each well, at least one additional well, the main and additional wells being placed in the same row and successively overlapping each other, and

filling each main well with a concrete mix is carried out by feeding the concrete mix in portions into one of the extreme additional wells of the row, compacting each portion of the concrete mix until leveling it up in the remaining wells of the row.

Figure 1 shows the anchor installed in this way, a longitudinal section; figure 2 - the same cross section.

The method is carried out in the following manner.

In a rocky or concrete massif

Drill holes 2-4 placed on the same straight line. The distance between the centers of the wells is assigned less than the diameter of one well, due to which the wells partially overlap each other. It is recommended that the distance between the centers of neighboring wells be equal to 3/4 of the diameter of one well. For well placement. For example, devices with the lowering of a guide rod in a well drilled first can be used on one straight line during drilling.

After completion of wells 2-4, anchor 5 is inserted into the middle well 3 with a transverse element 6 at the end. Then a portion of concrete solution is fed into one of the extreme wells, for example well 2, and the flow through the well 4 to the anchor is monitored, into which the solution according to the law of the communicating vessels enters through the gaps between the anchor 5 and the walls of the borehole 3. After this, a source of vibration is introduced into the borehole 2 and vibrational oscillations are communicated to the concrete solution, which are also transmitted to the concrete mass in the middle borehole 3 and to each other oh extreme well 4. In this case, the vibration effect is carried out very effectively, since in the well

2net anchor that would interfere with the input elements of the vibrator. Under the action of vibration, compacted concrete is carried out in all wells, with the most intense compaction initially taking place in the well.

2, however, the vibrational oscillations are sufficiently spread to other wells, after some time the levels of concrete in wells 2 and 4 are almost equalized, j4to can be determined with the help of dips in wells 2 and 4. If the levels of concrete in wells 2 and 4 is approximately the same, it follows from this that in the well 3 the concrete is also compacted, because vibrations are transmitted to the concrete in the well 4 through the mass of concrete in the well 3.

Then, a portion of the concrete solution is introduced into one of the extreme wells, and all operations are performed in the same order, while to level the degree of concrete compaction in the extreme wells, the concrete solution can be alternated in the extreme wells. If, for example, the first portion of the concrete solution was fed into the well 2 and a vibration source was introduced into this well, then the second portion can be fed into the well 4 and, accordingly, the vibration source is introduced into it. The batch feed of the concrete mix and its vibratory compaction are carried out until all three wells are filled to the full height.

The method provides a significant increase in the carrying capacity of the anchors, since the quality of compaction of the concrete and the degree of contact of the concrete with the walls of the well and with the anchor are improved. This is achieved by providing the possibility of an effective vibration effect on the concrete pacjBOp, which is poured into the wells, and not on the anchor, since the vibration of the anchor itself deteriorates its adhesion to the concrete, as well. also the ability to control the quality of the fill.

The use of the invention allows to reduce the cost of installation of anchors and, therefore, the cost of construction of structures.

Claims (2)

1. Afrikanov Yu. I. and others. Experience of anchoring concrete structures. Energy construction, 1973, 4, 0.21. 2. Timofeev A.P. From the experience of anchoring concrete structures. Hydraulic engineering, I960, 7, p.16. Phi, /