The method of injection piles

 

The invention relates to the construction, in particular to a method of construction of pile foundations and foundations mainly in weak soils, and can be used in industrial and civil construction as the construction of new buildings and structures, and the strengthening of the foundations of old, damaged or requiring reconstruction. The method of injection piles includes a device well without removing the soil by pushing the tip and injectiona hardening fixing solution through injecting pipe. What's new is that use perforated along the entire length injecting pipe, on the end of which is fixed a conical tip, consisting of a disk and cutting plates, the edges of which are at the base of the disk, the diameter of which is larger than the diameter inyectoras pipe and the soil is pushed injecting pipe with a tip with simultaneous cutting on the walls of the borehole longitudinal grooves and the education gap between the walls formed by the well and inyectoras pipe, and at the end of the injection process injector pipe with tip left in the well. The technical result of the invention is to improve manufacturability, the carrier sposobnostey construction, in particular to methods of construction of pile foundations and foundations mainly in weak soils, and can be used in industrial and civil construction as the construction of new buildings and structures, and the strengthening of the foundations of old, damaged or requiring reconstruction.

The known method devices bored piles-injector, in which the pre-made hole lower reinforcement cage with ring injectors and concreted pile shaft, a ring injectors at the same time placed in an area with poor soil with a certain interval, which provides the required penetration injectisome substances. After concreting the shaft serves injectisome substance in the annular injectors sufficient to flush the bentonite solution and washing the hole injectors. Injectisome substance penetrating into allowany the soil changes its properties, creating around piles in weak soil zone soil with the required properties, then injectiona stop.with. The USSR №1359411, E 02 D 5/62, publ. 15.12.87).

Know of any other way of constructing bored piles-injector, including the formation of a hole in the ground, the installation inyectoras pipe, concreting suaniem fixing solution through injecting pipe. For discharge of the solution in the vertical direction and the need for high pressure injection after the formation of the well at the bottom set the pillars on which rest the special sealing element in the form of a disk and install injector pipe with a shut-off device. Injectiona produce twice: first, the injection of fixing solution so as to provide the desired radius of the docking region, and then the injection of cement mortar with a gradual increase in pressure, followed by exposure time under pressure.with. USSR: No. 1052625, E 02 D 5/62, publ. 07.11.83).

The disadvantage of these two methods is that they require pre-drilling with the removal of the soil. The technological process is performed in three stages: formation of wells, installation of injection equipment and injectione. To perform these operations require special equipment and installing (reinstalling) it leads to increase in terms of doing work on the piles.

Known another method of CFA piles in which the device is well produced without removing the soil. According nogo on the rod drilling machine and having a diameter, equal to the diameter of the hole, the rod drilling rig mounted pneumatic punch, is attached to the tip. Then well install the valve and produce injectiona hardening material (application RU # 2000117934/03, MKI7E 02 D 5/34, 5/44).

This method is used for the prototype.

The advantage of this method compared to the first two is that well suit without removing ground - mounted on the rod rig tip rotation is pushed into the soil, allowing the soil compaction at the base of the well. However, preliminary education well it is. This additional process operation leads to an increase of the period of construction of CFA piles and, consequently, to increase its value. In addition, soil compaction around arranged so piles is not large enough, which affects the bearing capacity of the pile she, in turn, is also small.

Object of the present invention is to improve the processability, the bearing capacity of piles by reducing the time of its construction.

The problem is solved by using the fact that in the known method, including the device well without removing the soil ispolzuut perforated along the entire length injecting pipe, at the end of which is fixed a conical tip, consisting of a disk and cutting plates, the edges of which are at the base of the disk, the diameter of which is larger than the diameter of inyectoras pipe and the soil is pushed injecting pipe with a tip with simultaneous cutting on the walls of the borehole longitudinal grooves and the education gap between the walls formed by the well and inyectoras pipe, and at the end of injection injector pipe with tip left in the well. In addition, the pile is formed in the form of a vertical rod with undulating lateral surface, and to increase the depth range of works injector pipe increase by attaching to the upper part of the additional inyectoras pipes of equal diameter.

The proposed method differs from the prototype in that:

- on the walls of the borehole is cut into longitudinal grooves;

- use perforated along the entire length injecting pipe, on the end of which is fixed a conical tip, consisting of a disk and cutting plates, the edges of which are at the base of the disk, the diameter of which is larger than the diameter inyectoras tubes;

- in the soil is pushed injecting pipe with a tip with simultaneous cutting on the walls of the borehole longitudinal posovetivali injecting pipe with tip left in the borehole;

the pile is formed in the form of a vertical rod with undulating lateral surface;

- injecting pipe increase by attaching to the upper part of the additional inyectoras pipes of equal diameter.

The use of perforated along the entire length inyectoras pipe, on the end of which is fixed a conical tip, consisting of a disk and cutting plates, the edges of which are at the base of the disk, the diameter of which is larger than the diameter of inyectoras pipe, allows for cutting longitudinal grooves weaken the near-wall layer of the well and creates the opportunity when the injection deep penetration hardening fixing solution in the boundary layer of the soil. This leads to condensation (hardening) and increases the soil resistance on the side of the pile shaft, therefore, the bearing capacity of piles increases. The combination of operations provides a significant reduction in the time process of the device of the pile, as it eliminates a separate operation education well. All operations on the formation of the hole and dive into it injector produced one equipment in a single operation method.

Further, the method is illustrated by a specific example.

In Fig.1 p is swedena the proposed method, longitudinal section; Fig.3 - node 1 in Fig.2; Fig.4 - cross section a-a in Fig.3; Fig.5 - increasing the pipe segment.

The method is as follows.

On the surface of the ground set injector pipe 1, on the end of which is fixed a conical tip, consisting of a round disk 2 and the cutting plates 3, with their edges protruding beyond the base disk 2. The diameter of the disk 2 is larger than the diameter inyectoras pipe 1. Injectory pipe is provided with a through flanges 4 and the diameter of each of them is equal to the base diameter of the disk. The immersion pipe 1 with tip and flanges in the soil produced by using a pressing machine or vibro (figure not shown). Since the diameter of the tube 1 is less than the diameter of the disk 2 and the flange 4, in the process of immersion pipe, a gap between the pipe 1 and the wall 5 of the bore 6, which prevents clogging of the holes 7 of the tube 1 soil. Simultaneously with the immersion tube, the formation of the hole 6 at its walls with the help of cutting plates 3 are cut into the longitudinal grooves 8, weaken the soil near-wall region of the bore 6. If the original length inyectoras pipe 1 will not be sufficient to achieve at full indentation in the primer design mark are gaining, for example, privae achievements pipe 1 design elevation of the well plugging one of the known methods. For example, crushing into the well tube 10 and hold the load 11. Then through injecting pipe carry out the injection of cement-sand mortar under pressure. Arriving in the soil solution is localized, compacting zone of the soil under the hole and around the hole. Loosening of the cutting plates 3 near-wall region of the soil promotes deep penetration of the solution in this region and around it, forming a reinforced (strengthened) zone 12, which increases the bearing capacity of piles. At the end of injection to produce the molding soil of high pressure, which helps to improve the soil properties at the site of injection and in the surrounding array. Injecting pipe with a tip leave well they fulfil the function of a reinforcing cage created in the proposed method, the pile, and this, in turn, increases its load-carrying ability.

The proposed method is more sophisticated compared with the prototype, as it has a small amount of preparatory work, no prior device well, eliminates the additional installation of the reinforcement cage in the hole, and the bearing capacity is greater due to compaction (hardening) of pit space.

2. The method according to p. 1, wherein the pile is formed in the form of a vertical rod with undulating lateral surface.

3. The method according to PP.1 and 2, characterized in that injector pipe increase by attaching to the upper part of the additional inyectoras pipes of equal diameter.

4. The method according to p. 3, characterized in that the additional injectory pipe has a nozzle on the end that is inserted into the hole of the first pipe and weld them in a circle.

 

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