JPH09137430A - Method of water channel construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for processes such as a landslide protection wall, the curing of concrete on the face of a slope, etc., by preparing continuously inclined walls into the ground while being oppositely faced so that the lower ends of the continuously inclined walls are connected continuously and excavating a triangular sectional section surrounded by the opposed continuously inclined walls. SOLUTION: Oblique underground continuous walls or continuously inclined walls 1a, 1b formed in a wall shape by sheet piles, precast boards, etc., are prepared in the ground while the lower ends of these walls are faced oppositely so as to be continuously connected. A triangular sectional section surrounded by the opposed continuously inclined walls 1a, 1b is excavated, and a ditch as a water channel is prepared. The left and the right are brought to the state, in which they are landslide-protected by the continuously inclined walls 1a, 1b, in the triangular sectional section to be excavated at that time. Since the continuously inclined walls 1a, 1b are constructed beforehand on the side faces of the ditch as the water channel and exposed, the face of a slope is protected by the continuously inclined walls 1a, 1b. Accordingly, processes such as a landslide protection wall, the curing of concrete on the face of the slope, etc., are unnecessitated, and the term of works can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterway construction method.

[0002]

2. Description of the Related Art Conventionally, when constructing a waterway, when excavating a ditch that serves as a waterway, it supports earth pressure and water pressure of the excavation surface and the surrounding ground, and holds a mountain to prevent collapse and excavation. The slope of the formed groove is sprayed and cured with concrete or glue frame.

[0003]

In addition to excavation of trenches, steps such as mountain retaining and slope curing are required, resulting in a large number of steps and a long construction period.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to provide a waterway construction method in which steps such as mountain retaining and slope protection are not required, and the number of steps is reduced, and the method is simple and safe. is there.

[0005]

In order to achieve the above object, the present invention firstly provides an oblique underground continuous wall in the ground or an oblique continuous wall formed in a wall shape by a sheet pile, a precast plate or the like. The gist of the project is to create a groove that forms a waterway in the opposing diagonal connecting walls by excavating the section with a triangular cross section surrounded by the opposing diagonal connecting walls so that the lower ends connect to each other. Is.

Secondly, an oblique continuous underground wall or an oblique continuous wall formed in the shape of a wall by a sheet pile, a precast plate or the like is formed in the ground so that the lower portions thereof are close to each other. The gist of the present invention is to excavate a portion surrounded by a wall, to form a horizontal floor plate between the lower portions of the facing diagonal connecting walls, and to form a groove serving as a water channel between the floor plate and the facing diagonal connecting walls. Is.

According to the first aspect of the present invention, if the slanted connecting walls are formed in the ground so that their lower ends are connected to each other by the SMW method (current position soil mixing method) or the like, they will face each other. The left and right sides of the section with a triangular cross section surrounded by the slanted wall are secured by slanted walls, so this section can be safely excavated even on soft ground. Moreover, after the excavation is completed, a groove serving as a water channel having a triangular cross section is formed, and a sloped connecting wall is already constructed on the side surface, so that the sloped connecting wall can protect the slope.

According to the second aspect of the present invention, in addition to the above action, if the lower portions of the diagonal connecting walls facing each other are separated from each other,
During this time, a horizontal floorboard can be created and the bottom of the waterway can be finished horizontally.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional front view showing a first step of a first embodiment of a water channel construction method of the present invention, and FIG. 2 is a vertical sectional front view showing a second step of the same. The oblique connecting walls 1a and 1b are underground.
Etc. are made to face each other so that their lower ends are connected.

The method of constructing the diagonal connection walls 1a, 1b is SM
Continuous wall construction method such as W construction method (current position soil mixing construction method), pillar row type construction method in which cast-in-place piles, prefabricated piles, etc. are continuously arranged to construct a columnar wall body, sheet pile or precast concrete It is possible to build in. The SMW method (current position soil mixing method) is used in the soil by discharging a mixed liquid suitable for the purpose such as cement and bentonite from the tip of the kneading shaft when excavating the local plate into a wall shape in units of one element. Mix with position to create a one element soil cement wall. In this method, each element of the soil cement wall thus constructed is completely wrapped to form a wall body integrally connected.

By excavating a portion having a triangular cross section surrounded by the opposing diagonal connection walls 1a and 1b constructed as described above, a groove to be a water channel 2 is formed as shown in FIG. At the time of this excavation, the left and right portions of the triangular section to be excavated are clamped by the diagonal connecting walls 1a and 1b, so that this section can be safely excavated even on soft ground.

Oblique connecting walls 1a and 1b have already been constructed on the side surfaces of the groove formed by excavation to form the water channel 2. Since these are exposed, the slope connecting walls 1a and 1b can protect the slope. Moreover, the number can be reduced even when a cross beam is required.

If it is necessary to finish the bottom of the water channel 2 horizontally, the floor plate 3 is formed by excavating a groove having a triangular cross section and then pouring concrete on the bottom as shown in FIG.

FIG. 4 shows a second embodiment, in which the diagonal connecting walls 1a,
1b is formed so that the lower portions thereof face each other so as to approach each other in a separated state, and the portion surrounded by the opposing diagonal connection walls 1a and 1b is excavated to form a trapezoidal groove. Since it is not closed by the walls 1a and 1b, it is suitable for construction in a place where ground strength is expected. Also in this case, when excavating as in the case of the first embodiment, the diagonal connecting walls 1a, 1
There is no need to perform additional mountain fastening because it is in the state of mountain fastening in b.

After the trapezoidal groove is formed, concrete is placed on the bottom of the slanted connecting wall 1 which is separated.
A floor plate 3 is formed by connecting the lower portions of a and 1b.

FIG. 5 shows an example in which the construction method of the present invention is applied to the case where the existing water channel is modified for the purpose of widening or for other purposes. The slanted connecting walls 1a, 1b and the like are formed so as to face each other so that their lower ends are connected, and the slanted connecting walls 1a, 1b are formed outside the existing water channel 4.
If the portion surrounded by 1b is excavated, a groove having a triangular cross section larger than this is formed outside the existing water channel 4.

Therefore, if the existing water channel 4 is removed after the completion of excavation, a water channel 5 larger than the existing water channel 4 is newly formed outside the existing water channel 4 by the diagonal connection walls 1a and 1b.

In this case, since it is possible to construct the water channel 5 which is widened while the existing water channel 4 is being used, it is necessary to provide a temporary water channel separately during the construction work, or the existing water channel 4
There is no need to divide the halves in half to prevent water from entering the excavation part, and the construction is easy.

When there is a space for providing a temporary water channel separately from the existing water channel 4, although not shown, the slanted connecting wall 1a as shown in FIG.
It is possible to construct a new water channel by a construction method in which the lower end of 1b is separated and the lower part is not completely closed.

In this case, the oblique connecting wall 1 is provided outside the existing water channel 4.
After excavating the portion surrounded by a and 1b to form a groove having a trapezoidal outer shape, the existing water channel 4 is removed, concrete is placed at the bottom of the groove, and the diagonal connection wall 1a is separated. 1b
The floor plate 3 is formed by connecting the lower part of the above, and the existing water channel 4 cannot be used during this period, so the temporary water channel is used.

[0021]

As described above, according to the waterway construction method of the present invention, the safety at the time of excavation can be ensured only by constructing the oblique connecting wall and the like prior to the excavation. Since the construction is completed, processes such as mountain retaining and slope curing are not required, and the number of steps is reduced, and it is possible to construct simply and safely.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a first step of a first embodiment of a waterway construction method of the present invention.

FIG. 2 is a vertical sectional front view showing a second step of the first embodiment of the waterway construction method of the present invention.

FIG. 3 is a vertical sectional front view showing another example of the first embodiment of the waterway construction method of the present invention.

FIG. 4 is a vertical sectional front view showing a second embodiment of the waterway construction method of the present invention.

FIG. 5 is a front view in vertical section when the waterway construction method of the present invention is applied to widening an existing waterway.

[Explanation of symbols]

 1a, 1b ... Inclined wall 2 ... Waterway 3 ... Floorboard 4 ... Existing waterway 5 ... Waterway

Claims (2)

[Claims] 1. An oblique underground continuous wall or an oblique continuous wall formed in the shape of a wall by a sheet pile, a precast plate or the like is formed so as to face each other so that the lower ends thereof are connected to each other. Drill a part with a triangular cross section surrounded by
A waterway construction method characterized in that a groove that becomes a waterway is created by facing diagonal connecting walls. 2. An inclined underground continuous wall or an oblique continuous wall formed in the shape of a wall by a sheet pile, a precast plate or the like is made to face each other so that the lower portions thereof are close to each other, and the diagonal continuous walls are opposed to each other. A method for constructing a water channel characterized by excavating an enclosed portion, forming a horizontal floor plate between lower portions of opposing diagonal connecting walls, and forming a groove serving as a water channel between the floor plate and the opposing diagonal connecting wall. .