RU154896U1 - Injection piling for weak soils - Google Patents

Injection piling for weak soils Download PDF

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Publication number
RU154896U1
RU154896U1 RU2015101609/03U RU2015101609U RU154896U1 RU 154896 U1 RU154896 U1 RU 154896U1 RU 2015101609/03 U RU2015101609/03 U RU 2015101609/03U RU 2015101609 U RU2015101609 U RU 2015101609U RU 154896 U1 RU154896 U1 RU 154896U1
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Russia
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injection
pile
concrete
pipe
injector
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RU2015101609/03U
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Russian (ru)
Inventor
Анатолий Иванович Полищук
Аркадий Александрович Петухов
Дмитрий Сергеевич Назин
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Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный архитектурно-строительный университет" (ТГАСУ)
Анатолий Иванович Полищук
Аркадий Александрович Петухов
Дмитрий Сергеевич Назин
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Application filed by Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный архитектурно-строительный университет" (ТГАСУ), Анатолий Иванович Полищук, Аркадий Александрович Петухов, Дмитрий Сергеевич Назин filed Critical Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный архитектурно-строительный университет" (ТГАСУ)
Priority to RU2015101609/03U priority Critical patent/RU154896U1/en
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Abstract

1. Injection pile for soft soils, containing a concrete barrel and a reinforcing cage located inside the concrete barrel, including an injection pipe with perforated holes, consisting of sections rigidly interconnected, and a conical tip fixed to the end of the injection pipe and made in the form of a disk protruding for the contour of the injector pipe, with cutting plates welded to the disk from below, characterized in that the injector pipe has a perforated lower section and the concrete barrel is formed by injection of concrete mixture through the injector pipe simultaneously with the immersion of the injector pipe into the ground and is made with widenings protruding beyond the circumference of the disk circumference of the cone tip of the injector pipe. 2. An injection pile according to claim 1, characterized in that the concrete shaft is evenly extended along the length of the pile shaft. 3. An injection pile for soft soils according to claim 1, characterized in that a concrete shaft made in heterogeneous soft soils has broadening piles of different diameters along the length of the pile. 4. An injection pile according to claim 3, characterized in that the broadening of the concrete trunk in weak soil layers is made of a larger diameter.

Description

The utility model relates to the field of construction, and can be used in industrial and civil engineering, both in strengthening the foundations of old, damaged or requiring reconstruction of buildings, and in the construction of new foundations of buildings and structures, mainly on soft soils.
The prior art injection pile according to the patent of the Russian Federation for utility model No. 87718, IPC E02D 5/34, publ. 10/20/2009. The pile contains a concrete barrel, an injector, a conical tip at the lower end of the injector, and a tamping device. The concrete shaft of the pile is formed by filling the concrete mixture from above through an injector, which is previously immersed at the design depth. The injector acts as a pile reinforcement and consists of one or more sections rigidly interconnected. Each section is made of four profile corners connected by transverse slats or reinforcing bars. The conical tip consists of a disc and cutting inserts. The disc protrudes beyond the edges of the injector. The grouting device includes a pipe for pumping the mortar and an extension ring. When the injector is pressed in, a gap is formed between the well wall and the injector, which reduces the pressure of the injector indentation and leads to a better formation of the concrete pile shaft. In addition, it becomes possible to use heavy, coarse-grained and more rigid concrete mixtures, which increases the strength of the pile on the material.
The disadvantage of the piles according to patent No. 87718 is that when the device is installed in weak water-saturated clay soils, the walls of the well are poured and the concrete mixture supplied from top to bottom is mixed with the soil, which reduces the bearing capacity of the piles.
Known injection pile for weak clay soils according to the patent of the Russian Federation for utility model No. 129522, IPC E02D 5/34, publ. 06/27/2013, which contains a concrete barrel and an injector. The injector acts as a reinforcing cage and consists of one or more sections. Each section is made of profile corners, rigidly interconnected using transverse slats or reinforcing bars. A conical tip in the form of a disk and cutting inserts welded to it is fixed at the lower end of the injector. Using the tip, the injector is pressed into the ground, forming a well. The concrete shaft of the pile is formed by pumping the concrete mixture from the bottom up with the help of a concrete feed sleeve lowered into the well. This formation of the concrete shaft reduces mixing of concrete with the ground mass and improves the quality of piles. The injector is put on top and a retaining plate is welded to it. The locking plate extends beyond the contour of the pile and is laid on the ground. This arrangement of the retaining plate allows you to expand the well in the radial direction due to the pressure of the supplied concrete mixture, to compact the soil and thereby increase the bearing capacity of the piles.
However, the formation of the design of piles according to patent No. 129522 does not exclude the swelling of the walls of the well and mixing of the concrete mixture with the soil. In addition, the construction of piles requires a lot of technological operations, special equipment to perform these operations, as a result, the cost and time of construction of piles are reduced.
Known injection pile arranged by the method according to the patent for invention RU 2238366, IPC E02D 5/34, publ. 10/20/2004. An injection pile made according to the specified method contains a concrete shaft and an injection pipe located inside the concrete shaft and acting as a reinforcing cage. Injection pipe consists of several sections rigidly interconnected and perforated along the entire length. A conical tip in the form of a disk protruding beyond the contour of the injector pipe and cutting inserts is fixed at the end of the perforated injection tube. The concrete barrel is arranged by pumping concrete mixture from above through an injector pipe submerged to the design elevation. During injection, the pile shaft is formed in the formed well in the form of a vertical rod with a wavy side surface. The pile according to patent No. 2238366 is more technologically advanced than the previous analogues and has increased bearing capacity.
Injection pile obtained by the method according to the patent for the invention No. 2238366, is the closest to the claimed pile and adopted as a prototype.
The disadvantage of the pile according to the prototype is the possibility of flooding (collapse) of the walls of the well in soft soils when it is erected at the stage between the formation of the well and the injection of the hardening mixture, which affects the formation of a continuous section of the constructed pile, its bearing capacity. In addition, the walls of the well around the pile according to the prototype are not sufficiently compacted, which also reduces its bearing capacity during operation. Not taken into account and the possible change in soil conditions (soil properties) along the length of the pile shaft.
The objective of the proposed utility model is to increase the bearing capacity of the injection piles by ensuring the formation of a continuous section with broadening of the trunk in layers of soft soils and taking into account the properties of soils.
The problem is solved as follows.
The injection pile for soft soils, like the prototype, contains a concrete barrel and a reinforcing cage located inside the concrete barrel. The reinforcement cage, as in the prototype, is an injector pipe with perforated holes and a conical tip fixed to the end of the injector pipe. Injection pipe consists of sections rigidly interconnected. The conical tip is made in the form of a disk protruding beyond the contour of the injector pipe and cutting inserts welded to the disk from below.
In contrast to the prototype, the injector pipe according to the claimed utility model has only the lower section made perforated, and the concrete barrel is formed by pumping the concrete mixture through the injector pipe simultaneously with the immersion of the injector pipe into the ground. The concrete barrel is made with broadenings protruding beyond the circumference of the disk circumference of the conical tip of the injector pipe.
The concrete trunk in homogeneous soft soils is uniformly expanded along the height of the pile. In the case of inhomogeneous weak soils, the concrete shaft has broadening piles of different diameters in height, moreover, in weak layers of soil, broadening is made of a larger diameter.
Thus, depending on the soil conditions (bedding along the length of the piles arranged), the proposed injection pile can be formed: in the case of homogeneous soils of equal trunk diameter along the entire length of the pile; in the case of heterogeneous soils with one or more broadening of the trunk of a larger diameter in the upper, middle or lower part of the pile, that is, in the zone of location of the layer (layer) of weak soils.
The expansion of the pile shaft at each stage of immersion of the injection pipe is possible by increasing the injection pressure of the hardening solution, or, for example, by increasing the time of injection of the hardening solution in a specific area.
The set of essential features characterizing the claimed injection pile, provides a solution to the problem of increasing the bearing capacity of the pile due to the formed solid section with broadening of the pile shaft in layers of soft soils.
The formation of a continuous section of the pile shaft is ensured by the simultaneous filling of the forming well with a hardening mortar (concrete mix) as the injector pipe is immersed from top to bottom. This technology eliminates the collapse of the walls of the well. An increase in the bearing capacity of the pile is ensured by the formation of additional broadening of the trunk along the length of the pile above the diameter of the conical tip and an even larger diameter in the layers (interlayers) of soft soils (if any) with simultaneous compaction of the soil.
The applicant is not aware of injection piles containing the totality of all the claimed features and characterizing a utility model, which confirms its novelty.
In FIG. 1 shows an injection pile arranged in uniform, soft soils along its entire length. In FIG. Figure 2 shows an injection pile arranged with one or more broadening of a larger diameter trunk in the middle of the pile. In FIG. Figure 3 shows an injection pile arranged with a broadening of a larger trunk at the level of the lower end of the pile.
The injection pile contains a concrete barrel with a reinforcing cage, the function of which is an injection pipe 1 with a conical tip in the form of a disk 2, to which the cutting plates 3 are welded. borehole wall 6. Injection pipe consists of separate sections 7, interconnected by means of nozzles 8. The lower section of the injection pipe is made with holes 4. The concrete barrel is expanded beyond the limits formed by the conical echnikom wellbore diameter piles 6 to 9. In weak homogeneous soils (Fig. 1) concrete barrel has a diameter broadening 9 over the entire height of the pile. In soils in which there are weaker interlayers of soils 11 (Fig. 2, Fig. 3), the concrete trunk is unevenly expanded and in interlayers 11 has broadenings 10, the diameter of which exceeds the diameter of broadens 9.
The manufacture of injection piles is as follows.
The bottom section of the injection pipe 1 is installed on the soil surface, at the end of which a conical tip consisting of a circular disk 2 and cutting plates 3 is fixed. The length of the lower perforated section 4 of the injection pipe 1 and the ordinary non-perforated sections 7 of the injection pipe are assigned based on the particular soil conditions of a particular site (subsequent layer-by-layer expansion of the pile shaft), as well as the possibility of their immersion in cramped conditions. The immersion of the pipe 1 with a tip into the ground is carried out using pressing equipment or a vibratory driver (not shown in the figures), through a connecting device (not shown in the figures). Since the diameter of the pipe 1 is smaller than the diameter of the disk 2, in the process of immersion of the pipe, a gap 5 is formed between the pipe 1 and the wall of the well 6, which prevents clogging of the holes 4 of the pipe 1 with soil. After immersion of the tip (part of the injector pipe) and formation of the wellhead, the wellhead is plugged using one of the known methods. For example, pushing a plug into the well (not shown in the figure) and holding it with a load. Simultaneously with the immersion of the injector pipe 1, the hardening solution is injected into the injector pipe 1 to ensure filling of the forming gap 5 and stability of the borehole wall 6. As the depth of immersion increases up to the design mark to ensure stability of the borehole wall and uniform filling of the forming gap, the injection pressure P 1 hardening solution may increase. As the hardening mortar, a mobile fine-grained concrete mixture with the necessary additives can be used, and with a small size of the formed gap, the cast concrete mixture. After immersion of the lower section of the injection pipe 1, an additional expansion of the pile shaft (in excess of the diameter of the disk 2) is performed by additional injection of the hardening solution under pressure P 2 . The discharge pressure P 2 may exceed the discharge pressure P 1 . The injection pressure P 2 at each stage of the expansion of the trunk along the length of the pile can be different and is assigned depending on the soil conditions of the site (soil properties in the injection zone), the depth of the lower section of the injection pipe 1 with the exception of hydraulic fracturing, uncontrolled leakage of the hardening mortar into the soil mass and to the surface. After immersion of the lower section of the injection pipe 1, it is built up, for example, welding to the upper end of the injection pipe 1 of the next section of the non-perforated pipe 7 with a pipe 8 of smaller diameter and continue immersion with the injection of a hardening solution with pressure P 1 . The immersion of the lower section of the injection pipe 1 with filling of the gap 5 with a hardening mixture, extension of the injection pipe with non-perforated sections 7 and additional layer-by-layer expansion of the pile shaft (over the diameter of the disk 2) is carried out in stages until the tip reaches the design mark.
The injection pile in FIG. 2, 3 is formed in the case of the presence of layers (interlayers) of weaker soils 11 at a particular site. The location of these layers is individual for each site, for example, it can be in the middle of the pile shaft (Fig. 2), or at the level of the tip (heel) of the pile (Fig. 3). Additional expansion of the pile shaft in the layers of soft soils 11 is performed at the moment the lower perforated part of the injection pipe 1 is located in this zone by additional expansion of the pile shaft 10 over the diameter of the pile shaft formed in other zones 9. Such expansion of the pile shaft is achieved by regulating the volume of injected hardening solution in zone of weak soils 11 and worse soil characteristics in these zones.
After expanding the pile shaft with the pressure of the last zone at the design mark of the location of the tip of the injector pipe, if necessary, pressurize the pile-soil system (time-out) of pressure P 3 , which allows the concrete mixture to be compacted, as well as further improve the soil properties in the surrounding pile array . Pressure P 3 is assigned based on the ground conditions of the site (soil properties) used when expanding the pile shaft along the pressure depth P 2 for additional injection of the solution in weak layers of the soil, as well as on the conditions for eliminating hydraulic fracturing and uncontrolled leakage of the hardening mortar into the soil mass. Of these conditions, the pressure P 3 may be higher than the largest of the pressures P 2 , and may be less. An injection pipe with a tip is left in the well, and it performs the function of reinforcing the piles.
An injection pile formed according to the utility model has a continuous section of the trunk due to the simultaneous filling of a hardening (concrete) mixture formed during injection of the injection pipe of the well. The increase in the bearing capacity of the piles is ensured by additional broadening formed along the length of the pile shaft over the borehole diameter with soil compaction (Fig. 1), and in the presence of layers of soft soils an even larger borehole diameter in these layers (Fig. 2, 3).

Claims (4)

1. Injection pile for soft soils, containing a concrete barrel and a reinforcing cage located inside the concrete barrel, including an injection pipe with perforated holes, consisting of sections rigidly interconnected, and a conical tip fixed to the end of the injection pipe and made in the form of a disk protruding for the contour of the injector pipe, with cutting plates welded to the disk from below, characterized in that the injector pipe has a perforated lower section and the concrete barrel is formed by the injection of concrete mixture through the injector pipe simultaneously with the immersion of the injector pipe into the ground and is made with widenings protruding beyond the circumference of the disk circumference of the conical tip of the injector pipe.
2. An injection pile according to claim 1, characterized in that the concrete shaft is evenly extended along the length of the pile shaft.
3. An injection pile for soft soils according to claim 1, characterized in that a concrete shaft made in heterogeneous soft soils has broadening piles of different diameters along the length of the pile.
4. An injection pile according to claim 3, characterized in that the broadening of the concrete trunk in weak layers of soil is made of a larger diameter.
Figure 00000001
RU2015101609/03U 2015-01-20 2015-01-20 Injection piling for weak soils RU154896U1 (en)

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Application Number Priority Date Filing Date Title
RU2015101609/03U RU154896U1 (en) 2015-01-20 2015-01-20 Injection piling for weak soils

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MM1K Utility model has become invalid (non-payment of fees)

Effective date: 20160121