JPH04231514A - Embedding method for foundation structure the foundation structure - Google Patents

Abstract

PURPOSE:To obtain foundation structure by simplified curing, which can be embedded simply and quickly without occurrence of great friction between it and the ground and also without the need for water. CONSTITUTION:The surface of a sheet 3 is coated with a lubricant 4 and another sheet 5 is laminated on the surface coated with the lubricant 4. These processes are made at least one time to form a lubricating sheet 2, and the sheet 2 is bonded to a base pile 1 which is in turn driven into the ground. Since the lubricant sheet 2 consisting of sheets 3 and 5 and the lubricant 4 is bonded to the surface of the pile 1, the operation can be made simply and quickly, compared to the case where water-swelling are coated into many layers. The use of the sheet 2 formed of synthetic resin or metal enables one to perform curing operation simply without influence of rain and also to use foundation structures bonded with the lubricating sheet even in places where soil contains less water.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a foundation structure for civil engineering construction in the ground, and to a foundation structure.

0002

[Prior Art] In order to bury foundation piles as a foundation structure in the ground, a hole for the pile is first formed in the ground using a construction machine, and then the foundation pile is buried in the hole for the pile. . If the ground in which the foundation pile is buried is multi-layered with particularly flexible compressibility, when the ground sinks or rises, friction will occur between the foundation pile and the ground, causing the foundation pile to exert shearing force in the vertical direction. receive. If the friction generated between the foundation pile and the ground is large in this way, the foundation pile will be dragged and displaced by changes in the ground, and eventually break. Therefore, it is necessary to increase the diameter of the foundation pile in response to such displacement of the foundation pile, but there is a problem in that increasing the diameter increases the cost.

[0003] In order to deal with such problems, it has been proposed that a water-swellable paint as a slippery film is applied to the surface of the foundation pile in order to reduce the friction that occurs between the foundation pile and the ground. (See Japanese Unexamined Patent Publication No. 63-27619). In other words, when a foundation pile coated with water-lubricating paint is buried in the ground, the water-swellable paint swells with the moisture in the ground, forming a slippery film between the ground and the foundation pile. Ru. This water-swelling paint reduces the friction that occurs between the foundation pile and the ground.

0004

[Problem to be solved by the invention] However, in the case of such conventional concrete piles in which water-swellable paint is applied to the surface, water is needed to swell the paint, which causes moisture in the soil. In some areas, this water-swellable paint does not act as a slippery film. Moreover, since the water-swellable paint must be applied to the concrete pile in several layers, this work is complicated and time-consuming. On the other hand, when storing concrete piles coated with this water-swellable paint, they must be protected from rain, and for this purpose a curing operation must be performed in which the entire concrete pile is covered with Holosheet. There was a problem that it was complicated.

[0005] The present invention provides a method for burying a foundation structure that does not require moisture, does not generate a large frictional force with the ground, and can be performed simply and quickly, and in addition, the curing work is simple. The purpose is to provide basic structures.

[0006]

[Means for Solving the Problems] In order to achieve such an object, the present invention first provides a lubricating material on one sheet, and then applies a lubricating material to the surface of this sheet on which the lubricating material is provided. The process of layering another sheet on top of the pile is carried out at least once, the slippery sheet thus formed is adhered to the foundation pile structure, and this foundation structure is buried in the ground. Further, the structure is such that a slippery sheet made of a plurality of sheets and a lubricating material interposed between these sheets is adhered to the surface of the foundation pile.

[0007]

[Operation] A lubricating sheet is made by providing a lubricating material on the surface of one sheet, and further placing another sheet on this surface. Then, the sheet and another sheet are brought into close contact with each other by the lubricating material, and become a single slippery sheet. This slippery sheet is adhered to the outer peripheral surface of the substructure. In this way, it is only necessary to adhere the slippery sheet to the surface of the substructure.

[0008] If the slippery sheet is made of synthetic resin or metal, it will be safe even if it gets wet with rain, and curing work will be easier.

Furthermore, the slippery sheet can reduce the frictional force generated between the foundation structure and the ground even in the absence of moisture.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings.

FIGS. 1 to 8 are diagrams showing an embodiment of a method for burying a substructure and a substructure according to the present invention.

In FIG. 1, reference numeral 1 denotes a foundation pile as a foundation structure, such as a concrete pile, and a slippery sheet 2 is adhered to the surface of this concrete pile 1.

As shown in FIG. 2, the slippery sheet 2 is a sheet 3 made of vinyl chloride resin (others are metal sheets, etc.).
A lubricant 4 is applied on the surface of the sheet, and another sheet 5 made of vinyl chloride resin (or a sheet made of metal, etc.) is placed on this surface. Then, the sheets 3 and 5 come into close contact with each other due to the surface tension of the lubricant 4, and become one slippery sheet 2. This slippery sheet 2 is adhered to the outer peripheral surface of the concrete pile 1. In this way, since it is only necessary to adhere the slippery sheet 2 to the surface of the concrete pile 1, this work can be done more easily and quickly than the conventional method of applying several layers of water-swellable paint. . In addition, the slippery sheet 2 adhered to the concrete pile 1 is this sheet 3
, 5 are made of vinyl chloride resin, so they will not be affected even if they get wet with rain, making curing work easy.

Next, in order to bury this concrete pile 1 in the ground, as shown in FIG. A concrete pile 1 is suspended by a crane 8, and this concrete pile 1 is buried in a hole 6. In addition, the slippery sheet 2 can be applied to the concrete pile 1 even when there is no moisture.
Since the frictional force generated between the concrete pile and the ground 7 can be reduced, the concrete pile 1 to which the slippery sheet 2 is adhered can be used even in regions where the soil has little moisture.

[0015] Here, when the ground sinks or rises, a frictional force is generated between the foundation pile and the ground, but it is difficult to actually measure the value of this friction. For this purpose, a pressure sensor such as a load cell is attached to a foundation pile and buried in the ground, a test load is applied to this foundation pile, and each applied load value and the corresponding pressure value of the pressure sensor are calculated. The magnitude of the frictional force is measured by comparing them.

First, as a conventional example, a pressure sensor 101 is attached to a concrete pile 101 that has not been subjected to any treatment, and this is installed in the ground of a soil layer as shown in FIG.
When the axial force distribution for each depth of the concrete pile was calculated by applying different loads to the upper end of the concrete pile 101, the results shown in FIG. 5 were obtained.

In FIG. 5, for example, when an axial force of 1500 t is applied to the upper end of a concrete pile, the axial force measured at the lower end of the pile at a depth of 26.0 m is approximately 200 t. In other words, the force of approximately 1,300 tons was due to the frictional force acting on the surface of the pile in the ground.

Next, a concrete pile 1 with a slippery sheet 2 adhered thereto is buried in the ground 7 having the geology as shown in FIG. Next, a test was conducted on the axial force distribution at each depth of the concrete pile 1 by applying different loads to the head of the concrete pile 1, and the results were as shown in FIG. 7. In other words, for example, 1370 t is attached to the head of the concrete pile 1.
, the axial force measured at the bottom 1a of concrete pile 1 at a depth of 58 and 75 m is approximately 1
It is 050t.

In this way, when the axial force is 1370t, the axial force at the bottom 1a is 1050t, so the frictional force acting on the surface of the concrete pile 1 to support the concrete pile 1 is approximately 320t. This is a much smaller value than before. Therefore, even if a large change occurs in the ground, the concrete pile 1 will not be displaced. Therefore, it becomes possible to reduce the diameter of the concrete pile 1, and the cost of materials such as reinforcing bars and concrete can be saved. In addition, the slippery sheet 2 can reduce the frictional force generated between the concrete pile 1 and the ground 7 even in the absence of moisture, so even in regions where the soil has little moisture, concrete piles with the slippery sheet 2 glued can 1 can be used.

On the other hand, as shown in FIG. 8, there is also a method in which a concrete pile 1 to which a slippery sheet 2 is adhered is driven into the ground 11 by a drop hammer 12 without forming a hole.

Note that the slippery sheet 2 is installed in a cylindrical shape in the hole 6 formed in the ground 7 without gluing the slippery sheet 2 to the concrete pile 1, and then the concrete is attached to the cylindrical slippery sheet 2.
It may be placed inside. The lubricant sheet 2 is composed of two sheets 3 and 5 and oil 4, but the lubricant 4 is further applied on the sheet 5, another sheet is placed on top of the lubricant 4, and this is It may also be constructed of three or more sheets and the lubricant 4 interposed between them.

[0022]

[Effects of the Invention] As explained above, according to the present invention, it is only necessary to adhere the slippery sheet to the surface of the substructure, so there is no need to apply water-swellable paint in many layers as in the conventional method. This work can be done easily and quickly compared to other cases. Also,
If the slippery sheet is made of synthetic resin or metal, the foundation structure to which the slippery sheet is adhered will not be affected even if it gets wet with rain, and the curing work will be easier. In addition, since slippery sheets can reduce the frictional force generated between the foundation structure and the ground even in the absence of moisture, foundation structures with slippery sheets glued can be used even in regions where the soil has little moisture. can do.

[Brief explanation of the drawing]

[Fig. 1] Smooth sheet showing one embodiment of the present invention

[Figure 2] Partially enlarged cross-sectional view of a foundation pile with a slippery sheet adhered to it

[Figure 3] Diagram showing how to bury foundation piles

[Figure 4] Diagram showing the ground in which conventional foundation piles are buried

[Figure 5] Axial force distribution curve diagram of conventional foundation piles

[Figure 6] Diagram showing the ground in which the foundation pile of the present invention is buried

[Figure 7] Axial force distribution curve diagram of the foundation pile of the present invention

[Figure 8] Diagram showing foundation piles being driven into the ground

[Explanation of symbols]

1...Concrete pile 2... Smooth sheet 3, 5...sheet 4...Lubricant 6...hole 7...Ground

Claims (2)

[Claims] Claim 1: The process of first providing a lubricating material on one sheet, and then overlapping another sheet on the surface of this sheet on which the lubricating material is provided is performed at least once, and the lubricating material is formed in this way. 1. A method for burying a substructure, comprising: adhering a slippery sheet to a substructure, and burying the substructure in the ground. 2. A basic structure characterized in that a slippery sheet consisting of a plurality of sheets and a lubricating material interposed between these sheets is adhered to the surface.