JP2545463B2 - Waterway construction method in soft ground and waterway block using the same - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a construction method for providing an agricultural or other irrigation channel on soft ground, and a soft ground flume block used at that time.

[Prior art]

When a canal is to be installed in very soft ground such as reclaimed land or buried soil, conventionally, a sheet pile is generally driven into both banks and cap stones are placed on top of it to remove mud from the inside of the canal. A typical method is the so-called sheet pile construction method.

[Problems to be Solved by the Invention]

As a large water canal for soft ground, the sheet pile construction method is typical as described above, but this construction method requires a high-strength and long sheet pile and is not easy to construct. In many cases, displacement and deformation of the workpiece due to natural settlement, traffic load, and overloaded load were observed, which was not only unstable, but there were many obstacles in maintenance. The present invention examines a new construction method instead of the above-mentioned sheet pile construction and develops a channel block for soft ground to be used for it, thereby reducing the amount of materials and simplifying the construction, and the stability and economic efficiency after the completion of construction. It is intended to obtain an excellent new construction method.

[Means for Solving the Problems]

Therefore, the present inventor does not improve the conventional sheet pile construction method, but excavates a channel cross section in a substantially inverted triangular shape with a gentle slope, depending on the soil type, and has a convex cross section at the deepest portion and is elongated in the flowing direction of the channel. A beam member (2) having a structure is installed, and a lower end portion of a side plate (1) is rotatably placed on both left and right sides of the beam member (2) so as to be in contact with a seating surface and an upright surface of the beam member to form a water channel. We have developed a method for constructing a canal in soft ground, which is characterized by forming. In addition, as described above, excavation is performed in a substantially inverted triangular shape, pile construction is performed at the deepest portion, and a beam member (2) having a convex cross section and an elongated structure in the flowing direction of the water channel is installed thereon,
The lower end of the side plate (1) is rotatably placed on the left and right sides of the beam member (2) so as to contact the seating surface and the upright surface of the beam member to form a water channel. A channel block for soft ground used in such a channel construction method for soft ground has two side plates (1) having hinge joints (3) of arcuate lower edges and a long beam member (2) having a convex cross section. And the lower end portions of the left and right side plates (1) and (1) are rotatably hinged so as to be in contact with the seat surface and the upright surface of the beam member (2) to form a substantially V shape. It is a feature. A channel block for soft ground used in such a channel construction method is composed of two side plates (1) having a hinge joint portion (3) of an arcuate lower edge and a long beam member (2) having a convex cross section. Then, the lower ends of the side plates (1) and (1) are brought into contact with the left and right sides of the beam member (2) installed at the deepest portion, and the beam members (2) are rotatably hinge-joined to each other to approximately V. It is characterized in that it is formed in a letter shape. The present invention is not the first idea to hinge the side plates. For example, in Japanese Utility Model No. 62-99689, in order to prevent buckling of the side wall of a conventional U-shaped block due to earth pressure,
Hinge joint so that earth pressure can be absorbed, that is, the bottom plate and side plate of the U-shaped block are formed as separate bodies to form a bottom block and a side block, and by hinge-joining them to the left and right side walls. The load is absorbed to prevent damage to the side wall. Since there is a wide bottom plate (bottom block) when attempting to form a water channel with such a gutter connection block, the conventional sheet pile construction method in which the water channel is formed by driving the sheet pile to remove the mud and the like inside is also taken into consideration. I have no choice.

[Action]

In the method for constructing a canal in soft ground and the canal block used therefor according to the present invention, a pair of left and right side plates (1)
(1) By joining the other side in a hinged state, both side walls are configured to press the slope with their own weights and to prevent mutual lateral displacement, and the slope excavated according to the degree of softness. The degree of opening between the side plates (1) and (1) is automatically determined in correspondence with the hinge portion, and a stable water channel can be obtained. Furthermore, the present invention is a gentle slope according to the soil quality, and since almost no horizontal part is left on the bottom part where both methods are opened,
Although the cross-section of the water channel is the most stable in shape, as mentioned above, if the pile member is piled below the beam member (2) and the beam member (2) is placed thereon, the beam member (2) is Such a load will be supported by the pile. Then, by pressing the rotatable side plates (1) (1) to the slope,
Although the slope is more stable, the earth pressure applied to both side plates becomes passive even if one side mainly works, due to insufficient safety factor and top load such as traffic load on both banks. Since they are linked so that lateral displacement is not allowed, the slopes behind the side plates can be stabilized.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a channel block for soft ground of the present invention, and FIG. 2 is an enlarged view of a hinge joint portion of the channel block. FIG. 3 is a front view showing a construction state. When the water channel is provided in the soft ground, when the water channel block for soft ground of the present invention is used, the water channel cross section is excavated into a substantially inverted triangular shape with a gentle slope depending on the soil quality. Then, as shown in FIG. 3, a beam member (2) having a convex cross section and an elongated structure in the flowing direction of the water channel is installed at the deepest portion. At this time, if the degree of softness is remarkable, pile construction is performed, and when the beam member (2) is placed on it, the load applied to the beam member (2) is supported from below by the support pile (10) and sinks. Can be prevented. The lower end of the side plate (1), which is rounded, is attached to the left and right sides of the beam member (2) so that the beam member (2) can rotate in a substantially V-shape by contacting the seat surface and the upright surface of the beam member (2). I have posted it. This is the so-called hinge joint (3), and the connecting bolt can be inserted into the bolt hole (4) provided at the lower end of the side plate (1) to integrally engage the blocks on both banks of the waterway. it can. The upper surface of the beam member (2) is also provided with a female screw hole (5) for attaching a restraining plate. As shown in FIG. 2, the restraining plate (6) is used for the settlement of the ground and the displacement of the side wall. Check the situation and so on, and adjust appropriately if necessary, and tighten and fix with the bolts (7). In addition, depending on the stable state, it is possible to place the weight-adjusted capstone (8) on the upper ends of the side plates (1) (1). The side plate (1) is provided with vertical ribs (9a) and horizontal ribs (9b) in the middle of the edge for the purpose of weight reduction and reinforcement. The upper end side of the side plates (1) (1) is in a state of being pressed against the slope of the waterway by its own weight.

【The invention's effect】

As described above, the method for constructing a waterway in the soft ground of the present invention and the waterway block used for the same are as described above, in place of a large waterway in a soft ground which is still insufficient in stability even if a conventional long and high strength sheet pile is used, It also saves material costs and provides a stable waterway. Since the hinge structure is adopted, the side plates are not subjected to large stress, and the weight of the waterway block can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a channel block for soft ground of the present invention, and FIG. 2 is an enlarged view of a hinge joint portion of the channel block. FIG. 3 is a front view showing a construction state. (1) Side plate, (2) Beam member (3) Hinge joint, (4) Side plate connecting bolt hole (5) Female screw hole, (6) Holding plate (7) Holding plate upper tightening bolt nut (8) Head stone , (10) Support pile

Claims (3)

(57) [Claims] 1. When a waterway is provided in soft ground, the waterway cross section is excavated into a generally inverted triangular shape with a gentle slope depending on the soil quality.
A beam member (2) having a convex cross-section and an elongated structure in the flowing direction of a water channel is installed at the deepest portion, and side plates (1) are attached to the left and right sides of the beam member (2) so as to contact the seating surface and the upright surface of the beam member. ) Is rotatably placed to form a water channel, which is a method for constructing a water channel in soft ground. 2. When a waterway is provided in soft ground, the waterway cross section is excavated into a generally inverted triangular shape with a gentle slope according to the soil quality,
A pile member (2) having a convex cross-section and having an elongated structure in the flowing direction of the water channel is installed on the deepest portion, and the seat surface of the beam member is provided on both left and right sides of the beam member (2). A method for constructing a waterway in soft ground, characterized in that the lower end of the side plate (1) is rotatably placed so as to be in contact with an upright surface to form a waterway. 3. A left and right side plate (1) (2) composed of two side plates (1) having arcuate lower edge hinge joints (3) and an elongated beam member (2) having a convex cross section. A channel block for soft ground, characterized in that the lower end of 1) is rotatably hinged so as to be in contact with the seat surface and the upright surface of the beam member (2) to form a substantially V shape.