JPH0387417A - Construction method for light weight banking - Google Patents

Abstract

PURPOSE:To make deformation small in quantity as well as to secure stability without impairing right-weight and easiness in execution by arranging materials which are comparatively high in compression stiffness within the inside of a light weight banking composed of materials small in compression stiffness to make it a composite structure with the materials for light weight banking. CONSTITUTION:The ground surface is excavated to a specified depth, a bottom concrete 17 is set up on the face of excavation 18, and furthermore, foamed styrol blocks 11 are piled up to a specified height. In the second place, wall panels 14 and 14 are set up, a plurality of vertical holes are concurrently provided for foamed styrol blocks 16 with a specified density by means of heating wires and the like. And said holes are filled with materials such as concrete, mortar, plastics and the like which are comparatively high in compression stiffness so that pile bodies 15 and 15 are thereby formed. This therefore permits vertical load applied after a banking has been constructed, to be mostly taken care of by the pile bodies 15 and 15 high in compression stiffness, thereby making it possible to make the quantity of deformation small to a lesser extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of constructing an embankment using a lightweight material with relatively low compressive stiffness, such as expanded polystyrene.

[Prior Art] Lightweight embankments using Styrofoam are generally made by directly stacking block-shaped Styrofoam bodies as shown in Figure 1.
It is constructed by covering with wall work 1, floor slab 2, etc.

In this case, the wall surface work is based on the material properties of Styrofoam.
Because it has the property of being dissolved by fire and fire, it is installed for the purpose of protection against these.

Regarding floor slabs, in addition to the same reason, as shown in Figure 3, the general strength characteristics of foamed polystyrene yield significantly when the strain exceeds 2%. It is constructed for the purpose of dispersing the traffic load so that it does not exceed a predetermined allowable stress determined from deformation and material strength.

[Problems to be Solved by the Invention] In embankments made of materials such as styrofoam, which have relatively low compressive rigidity and which produce uniform strain, large dynamic deformations occur due to the running loads of trains and automobiles. The problem becomes especially serious when the height of the embankment is high.

As a method of reducing dynamic deformation, it is generally considered to disperse the applied load. In conventional construction methods, for example in FIG. 1, when distributing the load, it is necessary to make the slab thicker.

However, in this case, the maximum stress distribution width is the embankment width,
It cannot be further dispersed. Therefore, when a relatively large dynamic load is applied over a large load width, such as on a railway, the allowable stress may often be exceeded.

On the other hand, as a method of efficiently distributing traffic loads, it has been considered to construct an embankment in the form of a heap as shown in Figure 2. In this case, the load can be distributed more widely than in FIG. 1, but it is not economical because it requires a lot of Styrofoam and a lot of land. Furthermore, since the slope portion is covered with soil, if this embankment is constructed on soft ground, uneven settlement will occur due to the soil's own weight.

The purpose of the present invention is to provide a method that can suppress deformation as much as possible when constructing an embankment using the above-mentioned materials under conditions such as railways, where dynamic deformation during train travel is severely restricted. do.

[Means for Solving the Problems] In the present invention, a material with relatively high compression rigidity such as concrete, mortar, plastic material, or sand is piled inside a lightweight embankment body using a material with low compression rigidity such as styrofoam. The aim is to solve the above problems by arranging them in the form of a composite structure with lightweight embankment materials.

[Effect] In other words, by placing antibodies with high compression rigidity in lightweight embankment materials with low compression rigidity, most of the dynamic vertical loads that act after construction of the embankment are shared by the antibodies, which acts on the lightweight embankment materials. The aim is to suppress deformation by reducing stress as much as possible.

[Example] Embodiments of the present invention will be described below based on the drawings.

In Fig. 4, the ground is first excavated to a predetermined depth. The bottom slab concrete 17 was used to ensure the required level when loading the Styrofoam and to evenly transfer the embankment load to the ground.
construction. The rigidity of bottom slab concrete is determined by the strength of the ground and the magnitude of the applied load. Thereafter, the foamed polystyrene blocks shown in FIG. 5 are piled up to a predetermined size. Alternatively, after stacking the conventionally used blocks shown in FIG. 6, vertical holes are made using heating wires or the like.

After constructing the wall surface 14, vertical holes drilled in the embankment body at a predetermined density are filled with mortar, sand, etc. to manufacture the pile body 15. In this case, the arrangement density, material, etc. of the piles are determined based on the magnitude of the applied load and the amount of permissible deformation. Furthermore, if shear deformation occurs in the embankment due to horizontal loads such as centrifugal loads from trains, the shear deformation can be restrained by filling the vertical holes with mortar and then inserting core materials such as reinforcing bars or H steel.

If the pile density is high and the weight of the filler impairs the lightweight nature of the embankment, PVC pipes, steel pipes, etc. may be inserted. Thereafter, concrete floor slab 12 is placed for the purpose of effectively transmitting the load to antibody 15 and protecting styrofoam block 16.

〔Effect of the invention〕

Since the present invention provides the tank bottom as described above, the following effects can be expected.

(a) Basically, most of the vertical load that acts after the construction of the embankment is transmitted to the high compression stiffness body via the deck slab, so the amount of deformation is much smaller than before.

(b) Since the antibodies are restrained by the polystyrene foam against vertical loads, the embankment will not collapse due to destruction of the antibodies.

(c) Stability can be ensured even against horizontal loads (earthquake loads, centrifugal loads from trains, etc.) acting on the embankment by adding bending rigidity to the body.

(d) The light weight of the embankment and the ease of construction, which are the characteristics of lightweight embankment construction, are hardly impaired.

(e) Styrofoam is not expected to have much strength in terms of resistance to applied loads, so it can be made with a lower density than conventional ones, making it economical.

[Brief explanation of the drawings] Figure 1 shows a vertical slope embankment using lightweight materials, Figure 2 shows a raised embankment using lightweight embankment materials, and Figure 3 shows a styrofoam embankment. Basic stress/strain curves, Figure 4 is a detailed explanatory diagram of the present invention, Figure 5 is a diagram showing the Styrofoam block used in the present invention, Figure 6 is a diagram showing the conventional Styrofoam block Figure 1...Wall surface Construction, 2... Floor slab, 3... Sand paving, 4...
・Sleepers, 5... Styrofoam, 6... Stress dispersion line, 7... Field ground, 8... Line center, 9... Covering soil, 10... Yield point, 1 construction... Road bed gravel, 12...
Floor slab concrete, 13... Railing, 14... Wall (flannel), 15... Antibody, 16... Styrofoam Pro Tsuk, 17... Bottom slab concrete, 18... Excavation surface, 19. ... Vertical hole Figure 1 Figure 2 Figure 3 Compressive strain (%) Figure 5 Figure 6

Claims (1)

[Claims] In the method of constructing embankments using lightweight materials with low compressive rigidity, such as styrofoam, concrete is used inside the embankment.
A method of constructing a lightweight embankment characterized by arranging materials with relatively high compression rigidity such as mortar, plastic, and sand in the form of piles and creating a composite structure with lightweight embankment materials.