JPH03191137A - Construction of culvert reducing acting soil pressure by reinforcing banking of outer peripheral part of culvert - Google Patents

Abstract

PURPOSE:To reduce the use amount of a reinforcing rod and to conserve cost by using a banking material compounded with a reinforcing material in the outer peripheral part of a culvert member having an extensible material mounted to the hinge part thereof and performing banking in parallel to the banking material of a general part. CONSTITUTION:Extensible materials are mounted to the hinge parts 2, 2 of culvert members 1, 1 and a banking material compounded with a reinforcing material such as a cementitious solidifying material is used in the outer peripheral parts 3... of the culvert members 1, 1. Banking is performed in parallel to the bankings 4, 4 of a general part to form a culvert. By this constitution, the soil pressure acting on the culvert members 1, 1 is reduced and the cross-sectional areas of the culvert members 1, 1 are reduced to make it possible to reduce the use amount of a reinforcing rod.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method for constructing a culvert buried in embankment.

[Prior Art] A conventional general method for constructing a culvert is to manufacture a rigid structure culper 1 using reinforced concrete members, and then fill the culvert with earth.

When a culvert is constructed using this method, the following vertical earth pressures act simultaneously on the culvert:

■Earth pressure due to the soil type of the embankment 6 ■A culvert with a rigid structure made of reinforced concrete has greater rigidity than embankment, so shear strain occurs within the embankment. Additional earth pressure due to this effect.

Therefore, the strength of the vertical earth pressure acting on the culvert is
It will not be linearly proportional to the earth cover D, but will increase exponentially.

[Problem to be solved by the invention] When attempting to construct a culvert with a large earth cover D using the conventional method, the acting earth pressure is large, so the members must be thick and many reinforcing bars must be placed, which increases the construction cost. increase,
Workability also deteriorates.

The problem to be solved by this invention is how to reduce the construction cost and simplify the construction of a culvert with a large earth cover D.

[Means to solve the problem] In order to solve the above problems, we invented the following method.

In FIG. 1, an elastic material such as rubber is attached to the hinge portion of the culvert member 1.

A culvert is constructed using embankment material reinforced by adding a cement-based solidifying agent to the outer circumference 3 of the culvert member 1.

[Function] When a culvert is constructed using the method described in the previous section, the earth pressure against the culvert increases as the embankment progresses, but as the stress in the culvert members increases, the elastic material of the hinge part 2 contracts, and the earth pressure increases at the outer periphery. Since the load is transferred to the reinforced embankment 3 of the culvert, the stress in the culvert member increases only slightly.

Therefore, the culvert can be constructed using members with small cross-sectional dimensions and a small amount of reinforcing steel.

[Example code] An example is shown in FIG.

[Effects of the Invention] When a culvert is constructed using the method of this invention, the earth pressure acting on the culvert members is smaller than that of a culvert constructed using the conventional general method, so the cross-sectional area of the members is small, and the amount of reinforcing bars is reduced. It also requires less.

The unit price of the reinforced soil in item 3 is 1.
Since the unit price of reinforced concrete is about 45,000 yen/ml, the construction cost is much lower than the conventional method even if the cost of reinforcing soil is added.

Comparing a culvert for a road with a 10-square height, the height from the road surface to the top of the embankment is 24 m, the construction cost of a culvert constructed using the method of the invention is approximately 60% of that of the conventional method, and the construction cost for the culvert is approximately 60% of that of the conventional method. You can save 850,000 yen.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the embodiment, 1 is a culvert member, 2
3 indicates the hinge portion of the culvert member, 3 indicates the embankment reinforced with cement-based solidifying material, 4 indicates the general embankment, 5 indicates the ground surface, 6 indicates the top of the embankment, and D indicates the overburden height. Figure 2 is a cross-sectional view of the hinge part, 2 is an elastic member, 2 is a steel rod, and -2 is a cap for insulating the steel rod and concrete.

Claims (1)

[Claims] An elastic material is attached to the hinge part (2) of the culvert member (1), and an embankment material containing reinforcing material such as a cement-based solidifying agent is used on the outer periphery (3) of the culvert member (1). Method of embanking parallel to (4) and constructing a culvert.