SU937617A1

SU937617A1 - Pile foundation

Info

Publication number: SU937617A1
Application number: SU802918861A
Authority: SU
Inventors: Анатолий Михайлович Гельфандбейн; Генрих Соломонович Лекумович; Илья Яковлевич Лучковский
Original assignee: Харьковский "Промстройниипроект"
Priority date: 1980-04-30
Filing date: 1980-04-30
Publication date: 1982-06-23

Description

(54) СВАЙНЫЙ ФУНДАМЕНТ(54) PILED BASE

1one

Изобретение относитс к строительству в частности к конструкци м свайных фундаментов .The invention relates to the construction, in particular, to the construction of pile foundations.

Известен свайный фундамент, включающий сваи с полыми оголовками с размещением их верха на уровне подошвы ростверка и соединением полости каждого оголовка с атмосферой, причем после возведени сооружени заполн ют полость каждого оголовка твердеющей смесью 1.A pile foundation is known that includes piles with hollow tips with their top placed at the level of the grillage base and connecting the cavity of each tip with the atmosphere, and after erection of the structure, the cavity of each tip is filled with a hardening mixture 1.

Недостатком этого свайного фундамента вл етс его мала несуща способность так как межсвайный массив грунта непосредственно вовлекаетс в работу только в ограниченной верхней зоне под ростверком, при этом усили от ростверка через межсвай ный грунт частично передаютс на сваи, что приводит к возникновению влени негативного трени , вызывающего дополнительную нагрузку на сваи.The disadvantage of this pile foundation is its low load carrying capacity, since the intersway array of soil is directly involved in work only in a limited upper zone under the grillage, while the forces from the grillage are partially transferred to the piles through the interstage soil, which leads to the appearance of negative friction causing additional load on piles.

Наиболее близким по технической сущности к предлагаемому вл етс свайный фундамент, включающий ростверк и сваи, имеющие в верхней части сквозные прорези , заполненные сжимаемым материалом 2.The closest in technical essence to the present invention is a pile foundation, including a grillage and piles having through-slots in the upper part filled with compressible material 2.

Недостатком известного свайного фундамента вл етс то, что межсвайный массив, грунта будет включатьс в работу только в верхней части сваи, а при закрытии прорезей (зазоров) в верхней части также может возникнуть в грунте эффект негативного трени , что приведет к перераспределению усилий и дополнительному нагружению сваи. Цель изобретени - повыщение несущей способности путем вовлечени в совместную работу с фундаментом околосвайного грунта.A disadvantage of the known pile foundation is that the intersite array, of the soil, will be put into operation only in the upper part of the pile, and when closing the slots (gaps) in the upper part, a negative effect of friction may also occur in the soil, which will lead to redistribution of forces and additional loading piles. The purpose of the invention is to increase the bearing capacity by engaging in collaboration with the foundation of near-soil soil.

Указанна цель достигаетс тем, что в свайном фундаменте, включающем ростверк и сваи, имеющие в верхней части сквозные прорези, заполненные сжимаемым материа5 лом, прорези выполнены по всей длине каждой сваи, причем суммарна величина прорезей одной сваи составл ет 0,2-1,0 величины предельно допустимой осадки фундамента .This goal is achieved by the fact that in a pile foundation, including a grillage and piles having through slots filled with compressible material in the upper part, the slots are made along the entire length of each pile, the total value of the slots of one pile being 0.2-1.0 values of the maximum allowable precipitation of the foundation.

20 На чертеже изображен предлагаемый фундамент, вертикальный разрез.20 The drawing shows the proposed foundation, a vertical section.

Claims

The pile foundation includes a grillage 1 and piles 2, consisting of individual elements 3 with slots (gaps) 4, filled with a material with a deformation modulus, less than the deformation modulus of elements 3. The proposed pile foundation structure works as follows. The load from the structure through the pile grillage is transferred to the massif of the interweave soil, while the grillage sediment occurs, the intersway massif compacts (sediment) and the slots 4 are gradually closed along the pile from top to bottom, the material filling the slits and the load the greater degree is transmitted directly to the piles 2. The total size of the gaps depends on the compliance of the soil at the bases of the lower cones of the piles and is assumed to be from 0.2 to 1.0 of the total allowable settlement of the pile foundations NTA. A total gap value of less than 0.2 of the permissible settlement of the pile foundation results in a small effect of engaging the intersweig ground. A gap size of 1.0 is permissible when the lower ends of the piles are supported on a practically incompressible base. The construction of the pile foundation is carried out as follows. Drilling from the bottom of the bottom of the bed (not shown), boreholes (not shown) to the level of the bedding of the rocky soil. The first lower element with a height of 2 m is concreted. A 30 mm thick gasket from a material with a small deformation modulus, for example, from foam plastic, is placed on a concrete element. Similarly, the remaining elements of the pile are made, filling the gaps between them with the above material. After construction, all the piles are satisfied with a rostverk. The proposed design allows to increase the bearing capacity of the pile foundation due to more complete inclusion of the intersweed soil into the work. Claims: Pile foundation, including grillage and piles, having through slots in the upper part, filled with compressible material, characterized in that, in order to increase the bearing capacity by engaging in joint work with the foundation of the near-ground soil, the cuts are made along the entire length each pile, and the total size of the slits of one pile is 0.2-1.0 times the maximum allowable draft of the foundation. Sources of information taken into account during the examination 1. USSR author's certificate No. 684097, cl. E 02 D 27/20, 1977.

2. USSR author's certificate number 727763, cl. E 02 D, 27/34, 1978.