SU949076A1 - Pile footing anf method for erecting it - Google Patents

Description

one

The invention relates to construction and is intended for the construction of foundations of buildings and structures.

A pile foundation is known that includes a pile, passed through a slotted through hole, and flexible rods, the lower ends of which are connected to the lower ends of the pile, and the upper ones are attached to the connector around its perimeter, and the washer is made in the form of an upward convexity of an elastic shell with an annular edge perimeter stiffness 1.

There is also known a method for erecting such a pile foundation, which includes driving piles and t g with flexible shells 1 previously attached to them.

However, such a foundation and the method of its construction are characterized by insufficient bearing capacity, additional material consumption (for example, reinforced concrete) for an annular stiffener of a shchyab and material of flexible tg, as well as a significant complication of work on driving piles with flexible ties attached to its lower end.

Closest to the invention of the technical essence and the achieved result is a pile foundation, including driven piles, combined by a grillage, as well as a method of its construction, including pile driving and the construction of a grillage. The carrying capacity of such pile foundations is determined by the resistance of the soil due to friction forces on the lateral surface of the piles and the resistance of the soil.

10 on the tip of the pile, corresponding to the strength of the soil at the level of the tip of the pile 2.

However, these pile foundations are characterized by insufficient bearing capacity and, consequently, increased material consumption of piles, since

15, the ability of foundations for the material of piles significantly (2-3 times) exceeds the carrying capacity of piles on the ground, which reduces the efficiency of pile foundations. The purpose of the invention is to increase the carrier

20 abilities.

Claims (5)

The goal is achieved by the fact that the pile foundation, which includes driving piles, combined by a grillage, is provided with flexible curvilinear, convexly facing upward surfaces, strained shells attached to the piles and located between them under the grillage with a gap relative to its sole, filled with bulk material. Each of the shells can be made HfeHa in the plan in the form of a praral polygon, attached by its vertices to its adjacent piles, or it can be made in the plan in the form of a strip attached at its two ends to the opposing sides of the pile grinder and the shells exceed the height of the bulk material layer with which the gap is filled. In this case, according to the method of erecting a pile foundation, which includes pile driving and erection of the grillage, the piles are first hammered into a part of their length, after which flexible shells are attached to them, and then the piles are finished to the design mark, and before erection of the grillage over the shells, bulk material. FIG. 1 shows a foundation, a longitudinal section; in fig. 2 - the foundation, the plan, the embodiment of the shells in the form of a regular polygon, attached by its vertices to the adjacent pile; in fig. 3 - the same, an embodiment of the shells in the form of a strip attached with their ends to two opposing piles. The proposed foundation includes driven piles 1, whose heads are monolithic in a reinforced concrete slab 2 of the pile grillage, a layer of sand 3, located under the plate of the pile grillage, curvilinear strained flexible shells 4, each of which is placed between its own 1, immersed in the ground adjacent to the edges of the sheath, and attached to them. Each shell is made with a bulge upward, repeating the outline of the ground of the base 5 underneath it. The flexible shells 4 in the plan can have the appearance of a regular polygon, for example a pentacle attached to its adjacent edges by its lines (Fig. 2). The flexible shells may also be in the form of a strip 6 attached at its ends to each of the two opposing piles 1 (Fig. 3). Flexible sheathing sheets can be made, for example, of fiberglass or sheet steel. The flexible sheaths are attached to the shells by means of metal clips 7. The clips 7 are connected to the flexible panels and the webs by means of known connections, for example bolted, bolted, etc. (not shown). The described method of erecting such a foundation involves driving piles 1 at first for a part of their length, after which flexible shells 4 are attached to them, and then piles 1 are finished to the design mark, then bulk material 3 is laid over the shells 4 and the rostver 2 is erected. The life of the flexible shells 4 occurs as a result of the addition of piles 1 to which the shells are pre-attached. It is advisable to dry out the construction of this pile foundation in the following sequence: tear off the foundation pit. pile piles, plan soil foundation for flexible shells ,; flexible shells made of flexible panels are laid on a ground base and attached to the pile, the piling is done, and the shells are covered with a layer of sand, the concrete pile plate is cast into concrete. Due to the tension of the flexible shells on the ground of the base, tight contact between the shells and the ground is provided, and the shells work in conjunction with their own. perceived part of the vertical loads acting on the foundation and transferring them to the foundation ground. In addition, the soil resistance along the lateral surface of the piles in the upper zone of the pile foundation is increased due to the compression of the base of the flexible shells. stiffness with a pile, as a result of which a reduction in the material consumption of the pile foundation and the labor intensity of the pile driving into the ground is achieved. The application of the proposed technical solution allows reducing cement consumption by approximately 50-60 kg and reinforcing steel per kg per square meter of the foundation plan (with average soil conditions and a specific load on the foundation 60-70 tf / m). Claim I. Pile foundation, including driving piles, combined by a grillage, characterized in that, in order to increase the carrying capacity, it is provided with flexible curvilinear, reversed convex surface upwards, with tight shells attached to the sv and located between them under the grill a gap with respect to its base, filled with bulk material. 2. A foundation according to claim 1, characterized in that each of the shells is made in plan in the form of a regular polygon, attached by its vertices to its adjacent m. 3. The foundation according to claim 1, characterized in that each of the shells is made in terms of a strip attached at its ends to two opposing sides. 4. The foundation of claim 1, characterized in that the height of the gap between the base of the grillage and the shells exceeds the height of the layer of bulk material, which fills the gap. 5. A method of erecting a pile foundation, including driving piles and erecting a grillage, characterized in that, in order to increase the bearing capacity, the piles are first driven into a part of their length, after what they attach to the flexible shells, and then the piles are finished to the design mark, and before the construction of the grillage over the shells, the bulk material is laid. Information sources, taken into account in the examination 1. USSR author's certificate number 676689, cl. E 02 D 27/12, 1978. 2. Vasiliev B. D. Foundations and foundations. Fundamentals of modern foundation building. L.-M., State Publishing House of Literature in Construction and Architecture, 1955, p. 279-281. FIG.  . “Xx;  T Phage. g