FI91984C - Method of reinforcing a structure to be formed in the soil - Google Patents

Description

91984

Method for strengthening the structure to be formed on the ground Forfarande for forstårkning av en struktur som skall bildas i j Orden

The invention relates to a method for improving soil reinforcement, in which a stabilizing or reinforcing additive is introduced into the soil, which is mixed with the soil to form the tax structure of the reinforced zone. In particular, the invention relates to a method in which a plot-like reinforcing structure is formed by modifying the soil locally along the volume of an elongate plot to be formed and adding a stabilizing or reinforcing additive to the soil so formed. in addition to the stabilizing additive, a separate reinforcing material is used.

A method known as pillar stabilization for reinforcing the ground is known from the construction technique, which method is generally carried out by pushing a rotary cultivator at the end of the shaft down from the ground. When the cultivator has reached a sufficient depth for the structure, the device is pulled back to the ground. The arm of the device is hollow in structure, and when pulled up, reinforcing material is pumped out through the arm, which the rotary cultivator mixes with the soil in the vicinity of the cultivator. Thus, when the cultivator is pulled up, a vertical pillar-like structure is created, in which a reinforcing substance is mixed with the soil. This pillar will form a structure stronger than the surrounding ground at the latest as the reinforcing material hardens.

Vertical reinforced pillar structures such as those described above have generally been used to stabilize the soil and, for example, to form temporary work walls, road and yard bottoms or the like, or to stabilize the base soil, especially in the case of poorly bearing soils.

91984 2

The column structures described above have so far been able to be used in applications where the suitably curable column consisting of earth and reinforcing material has been affected in particular by compressive forces in the direction of the column, but where shear or tensile forces have hardly occurred. This has limited the use of the method to certain types of applications, in which case the more general use of the method has generally required careful preliminary studies to ensure the conditions of use described above. If the described method has been used in unsuitable objects, there is a risk that the pillar structure formed on the ground will be broken. Thus, the only option left in these projects is the use of a conventional beam or column made separately from, for example, concrete and reinforced by conventional methods, which has often required multiple workloads, as the amount of soil corresponding to the beam or column structure must be removed before laying or casting. .

In parallel with this application, a Finnish patent application entitled "Method and means for reinforcing the ground" discloses a method for forming generally horizontally extending reinforcement lines in the ground. Particularly in connection with said method, a need has arisen to further strengthen the reinforcing lines to be formed in the ground in a reinforcing manner against higher shear and / or tensile forces.

According to the present invention, the problem is solved as set out in the appended claims. The invention is thus known in that a separate shear-resistant reinforcing material fed in addition to the soil comprising substantially local soil and a reinforcing additive mixed therewith is introduced from the soil into the soil and the soil is mixed therewith. , in connection with the operation of a modifying agent which mixes a stabilizing agent into the soil. In this way, the reinforcing material remains in the reinforced plot.

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3 91984 the field also receives shear and / or tensile forces acting on the structure, just like reinforcement.

The invention will now be described in more detail with reference to the accompanying schematic drawing, in which Figure 1 schematically shows a general arrangement according to one embodiment of the invention, Figure 2 schematically shows a general arrangement according to another embodiment of the invention, and Figure 3 shows in more detail an embodiment.

Figure 1 shows a general structure 21 of an arm 21 to be pushed from the ground 1 into the soil 2, at the lower end of which there is a shaping means 5. The arm 21 is suitably arranged as a hollow tube. The lifting and lifting means 20 is able to push the arm 21 with its associated shaping means 5 down to the ground, and correspondingly to lift the means 5 upwards. The modifier is suitably rotated by the motor-transmission device 26, so that the entire hollow arm structure 21 and the modifying means 5 at its end can be rotated in both directions.

The device according to Fig. 1 initially operates in a manner known per se in such a way that the shaping means 5 at the end of the arm 21 is pushed down to the desired depth in the soil 2, whereby the means 5 is rotated, if necessary, to promote penetration. Thereafter, the shaping means 5 is lifted back upwards, whereby a reinforcing additive, e.g. cement, bentonite or the like, normally used for this purpose, is fed at the same time through the hollow shaft 21. Figure 1 does not show in more detail how the intake of the additive is arranged, as this is a technique known per se in the art. Due to the structure and rotation of the shaping means 5 in a manner known per se, the fed additive mixes with the soil, 4 91984 forming a reinforced pillar or pile structure 8. Such a structure made according to a known method withstands compression, i.e. the weight acting in the direction of the structure. , but the structure is sensitive to lateral loads. The invention provides a solution to this problem by adding a reinforcing reinforcing or similar elongate and tensile-resistant separate reinforcing material 13 to the reinforcing column to be formed in the ground as the shaping means 5 retracts and suitably mixes the hollow tubular arm and shaping means 35 at the same time. a reinforcing additive fed to the modified soil. In this way, a reinforced pile-like or pillar-like plot structure 8 is created, which in particular has an additional tensile-resistant reinforcement 13 in the manner of conventional reinforcement known from concrete technology.

In the embodiment shown in Fig. 1, the feeding of the reinforcing material 13 is suitably arranged so that the reinforcing material 13 is preferably fed by means of a feeding device 12 provided with a reinforcing material storage via a hollow tube arm 21 and a shaping means 5, i.e. substantially together with a conventional reinforcing agent. The fed reinforcing material 13 can then be, for example, a conventional thinner reinforcing steel wire, another thin metal wire, preferably a web-like plastic material or other similar elongate material. When such a material 13 is fed through the center of the shaping means 5, the material 13 extends substantially longitudinally in the vicinity of the center of the plot-like structure, where it is able to receive, in particular, a direct tensile load.

In some cases, it is advantageous that, in particular at the beginning of the elongate flow of reinforcing material 13, it is still separately anchored to the beginning of the plot structure 8 to be formed. For this purpose, a separate anchor piece 19 is then preferably used, which according to one embodiment consists of slightly anchoring arms extending outwards in different directions, as shown in general in Fig. 1.

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Said anchor 19 is placed at the beginning of the reinforcing material run 13 and filled in the folded state together with the web to the desired depth, after which the anchor 19 spreads and holds the initial shaping means 5 during lifting, whereby no reinforcement material 13 needs to be placed.

As an alternative reinforcing material solution, a relatively short fiber or wire material, in particular formed by cutting, is known from concrete spraying, which in itself may be steel, synthetic fiber or another material suitable for the purpose. According to an embodiment of the invention, this reinforcing material is mixed with the reinforcing additive before this additive is brought into the vicinity of the shaping means 5 to be mixed with the soil released by the shaping means 5. In this solution, the reinforcing material 13 will mix mainly in the form of a circle through the entire plot structure 8. Such a circumferentially located reinforcement works effectively against shear forces in particular. A particularly advantageous solution thus comprises, in connection with this embodiment, still using, for example, centrally located additional reinforcement formed in accordance with another embodiment of the invention.

Figure 2 shows another arrangement according to an alternative embodiment. It has a substantially horizontal motion-shaping means 3, 5 attached to the lower end of a traction sheave 11 provided with a rotatable device 6. Pulling share 11, for its part, attached to a suitable surface of one of the traveling device, e.g. a conventional excavator 9 and the modifying means vålinettå 3, 5 vedetåån låpi of the soil in the direction of the arrow. A reinforcing additive is mixed with the soil-modified soil as described above in connection with Figure 1. In the described arrangement, e.g. a separate elongate reinforcing material 13 is fed from a separate cassette 12, suitably through a pipe 15, so that said reinforcing material 13 will settle in a modified structure 8 and reinforced in accordance with 91984 6 above.

Figures 1 and 2 show a simple solution in which such reinforcing material 13 in the form of strands in the form of a thread, wire or web is fed through the center of the modifier to form an additional reinforcement in the middle of the plot structure 8. In the arrangement according to Fig. 3, the reinforcement 13 is fed via separate nozzles 16, preferably penetrating somewhat into the modified space, after the shaping means 3, 5, so that one or more reinforcing runs 13 are located inside the plot structure 8 but adjacent to it and the surrounding ground 14. In practice, this interface 14 will be somewhat uneven, which in itself contributes to the stabilizing effect of the plot structure 8, especially since the plot structure 8 now also withstands some traction due to the additional reinforcement.

The elongate reinforcing material 13 described above is suitably formed of one or more rods, cables or wires, which may, for example, be metal, plastic material or other suitable material such as, for example, non-woven fabric. According to a particular embodiment of the invention, the material in question is in the form of a hollow sock or strip with a substantially sparse wall structure, whereby the mixed material is allowed to spread on both sides of the wall of the sock or strip. Such a sock can also be fed over the entire circumference of the modifier 3 itself, i.e. in the arrangement according to Fig. 2, suitably swung 11 from the cassette arranged around the rotating motor 6.

Fig. 3 further shows an additional arrangement according to an embodiment of the invention, in which, after the actual cultivator, and suitably approximately at the point where the additional reinforcement leaves the nozzles 16, a vibrating device 17 is arranged. vibration motion, whereby the internal friction of the mass decreases and the mass «·

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7 91984 condenses and adheres better to the fed reinforcement run or the like.

Examples of embodiments of the invention have been described above, but it will be clear to a person skilled in the art that the invention can be implemented in other ways within the scope of the appended claims. The Eras modification comprises, for example, the introduction into the ground by another means, e.g. sa with a separate mobile editor, for example. The embodiments described above can still be advantageously used, e.g. in parallel, within the same general arrangement to apply the reinforcement to exactly the desired position in the desired manner.

Claims (10)

91984 The patent was claimed by et al A method for reinforcing a structure to be formed in the ground, wherein the plot-like structure to be reinforced is formed by modifying the soil locally and adding a stabilizing or reinforcing additive to the thus-modified soil, which is mixed with the soil to form a reinforced plot (8) or zone, in addition to the stabilizing additive, a separate reinforcing material is used, characterized in that a separate shear and / or tensile-resistant reinforcing material (13) is introduced from the soil and the reinforcing additive mixed therein into the soil (4) advancing in the soil, in connection with the operation of the modifying tool (5). Method according to Claim 1, characterized in that the elongate plot (8) is progressively formed by means of the shaping means (5), the web-like, wire-like and / or fibrous material being suitably metallic, artificial or natural fibers. or wire, is fed into the reinforcing material (13) of the thread (8) in connection with the movement of the shaping means (5). A method according to claim 1 or 2, characterized in that -; It is not known that a multi-fiber material is used as the reinforcing material (13). 4. A patent claim. . 3, characterized in that the reinforcing material (13) is fed together with the reinforcing additive. 5. A patent claim. . 4, characterized in that a material consisting of chopped fibers or yarns is used as the reinforcing material (13). 6. Claims of a patent 1.. . 4, characterized in that a sparse material having a hollow 91984 sock-shaped shape is used as the reinforcing material (13), the cavities of which are filled with soil and an additive mixed therewith. A claim according to any one of claims 1 to 7. . 6, characterized in that a separate anchor piece (19) is placed at the beginning of the elongate reinforcement material (13). 8. A claim. . 7, characterized in that the reinforcing material (13) is fed in the immediate vicinity of the shaping means (5), suitably via the center of the shaping means (5). 9. A claim. . 7, characterized in that the reinforcing material (13) is fed from one or more separate nozzles (16) arranged outside the circumferential surface of the shaping means (5), suitably with respect to the direction of movement of the shaping means (5) to the means (5). in the rear space, preferably in such a way that the mouth of the nozzle (16) feeding the reinforcing material (13) is caused to penetrate to some extent into the formed plot-like structure (8). A claim according to any one of claims 1. . A method according to claim 9, characterized in that the mold (4) comprising soil, the reinforcing additive mixed therewith and the separate reinforcing material (13) is left in the mold (4) after the modifying and / or mixing device (5) has been left separate. ). 10 91 984