JPH0215691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a blind drainage construction method that enables efficient blind drainage of poorly drained ground for many years.

(Prior Art) As a conventional blind drainage work in the ground, for example, there is a construction method disclosed in Japanese Utility Model Publication No. 47-21931.
This construction method involves burying in the ground a bundled gutter, which is made by binding together with a rope or the like a large number of gutter formed from a synthetic resin film having a large number of small protrusions on the outer surface. However, the term "combining collection gutters" referred to here only means "simply bundling collection gutters together," and it has not been satisfactory in terms of the efficiency and permanence of the collection and drainage effect.
To explain this more specifically, the gutters used in this construction method have small protrusions on the outer surface as mentioned above, so when a large number of such gutters are tied together, the tied part The presence of small protrusions causes the gutters to be in point contact with each other, and as a result, the binding load is concentrated on the point contact area. This is especially true since the bonding section is made of a "film" that is not intended to bind, and deformation at the binding site has little effect on the bonding sites. Therefore, the deformation of the collecting gutter caused by bundling ends up simply by denting the tied part, and even if the tightening force of the bundling material or the bundling interval is changed, the water collection openings formed between the gutter The size of the binding part or the rigidity of the intermediate part of the binding part were not adjusted in any way.
In other words, the term "bundling of collection gutters" here refers to bundling for the sole purpose of handling convenience, such as facilitating the transportation and burying of bundled gutters. However, in the construction method using such tied gutters, soil particles are likely to enter the spaces formed between the gutters by the small protrusions and into the inside of the gutters. ,
A serious drawback was that the effective drainage cross-sectional area of the collection gutter was reduced within a short period of time.

By the way, in Japanese Utility Model Application Publication No. 51-99908, the present inventor provided four protrusions extending in the length direction so as to sandwich opposing water collection openings on the outer surface of the S-shaped gutter body. We have disclosed a blind drainage construction method in which a large number of blind drainage gutters are assembled and buried in the ground. When using this construction method, each blind drainage gutter has an S-shape, so in the case of a gutter assembly, ground water can be effectively drained into the gutter body regardless of the direction of the gutter (upward, downward, inclined direction, etc.). In addition to allowing water to flow in, a linear water collection port extending in the longitudinal direction of the gutter body is formed as a contact area between the gutter bodies, a contact area between the gutter bodies and the ridges, and a contact area between the ridges. It happens. This is different from the case of the blind drainage construction method disclosed in the above-mentioned Japanese Utility Model Publication No. 47-21931, in that the space formed between the linear water collection port and the gutter body as a contact part is concentrated in the longitudinal direction of the gutter. As a result, good water collection and drainage effects can be expected from the collection gutter. However, when a large number of such gutters are simply gathered together, in other words, they are not tied together with binding material and are simply gathered together, the lines that match the earth pressure of the area where each blind drainage is to be carried out. Therefore, the potential water collection and drainage function of the gutter itself cannot be effectively utilized.

Here, we will refer to the gutter assembly of the S-shaped blind drainage gutter disclosed in Utility Model Publication No. 51-99908.
The following is a consideration of the bundling gutter formed by bundling by applying the bundling means disclosed in Publication No. 21931. In other words, the binding means disclosed in the same publication is, as mentioned above, ``a binding made in a tightened state based on the simple idea that it is sufficient to prevent the collapse of the tied gutter'', and it includes the following: By optimizing the spacing between the tied parts and the tightening force of the binding material according to the situation of each part where blind drainage is to be performed, an ideal linear water collection port (in the longitudinal direction of the gutter) can be created between the tied parts. Since no consideration has been given to obtaining a water collection outlet extending to
Even if a group of blind drain gutters that have a letter shape are tied together, it will be the same as if the blind drain gutters were simply grouped together.
It is not possible to obtain a linear water collection port that matches the earth pressure of each site where blind drainage is to be performed, and it has been impossible to effectively utilize the potential water collection and drainage performance of the blind drainage gutter.

The present invention provides a blind drainage construction method that is completed by employing a special binding means in order to fully utilize the potential water collection and drainage characteristics of blind drainage gutters disclosed in Japanese Utility Model Application Publication No. 51-99908. The purpose is to

(Means for Solving the Problems) In the blind drainage process according to the present invention, two adjacent cavities 5a and 5b which become waterways are formed by winding both ends of the central wall 4 in opposite directions, Both winding ends 6, 6 are attached to the central wall 4 of the gutter body 8, which has an S-shaped cross section and has closed portions 7a, 7b, which serve as water inlets, formed between the winding end 6 and the center wall 4. In between, central protrusions 9, 9 are provided so as to protrude on both sides, and are located on the outer surfaces of the empty chambers 5a, 5b, on the left and right sides of one opening 7a and on the left and right sides of the other opening 7b, respectively. , a protrusion 10,1 on the outer surface extending in the axial direction
A large number of blind drainage gutters 1 made of hard synthetic resin, each of which has a diameter of 0.0, 10.0, 10.0, 10. In consideration of this, iron wire or binding material 2 having approximately the same tightness as iron wire shall be used and connected at the required intervals and with the required tightening force, and with this binding, each blind drain gutter will be bound. At the part, the winding end portion of the gutter body is elastically rolled inward and deformed, and this rolling elastic deformation is transmitted in the longitudinal direction of the gutter body via the protrusion of the gutter body, As a result, the gap G of the opening in the intermediate part 12 of the binding part is made large enough to ensure water inflow even when subjected to earth pressure, and the rigidity of the intermediate part is made such that it can resist earth pressure. As a result of this phenomenon in the blind drainage gutter, when the tied gutter assembly 3 is buried in the soil and subjected to earth pressure, the contact area between the gutter bodies between the tied parts, the gutter body and the protrusion, The linear water collection port 15, which serves as the contact area between the ridges and the contact area between the protrusions, serves as a water collection port that allows almost only water to pass through. Water can flow in and this state is maintained, and the connected gutter assembly is placed in the excavated groove 19, and the outside is covered with gravel, cobblestones, sand, rice husks, etc. It is characterized in that it is surrounded by a filter layer 40 made of filter material and buried in the soil.

(Example) An example of the present invention will be described below based on the drawings.

In the blind drainage construction method according to the present invention, a collection of blind drainage gutters 1 is bound as required using a binding material 2 to form a bundled gutter assembly 3, and this bundled gutter assembly 3 is immersed in the ground in a connected state. It is to be buried. This will be explained in detail below.

As shown in FIG.
Two adjacent cavities 5a and 5b, which become water channels, are formed by winding both end edges in opposite directions.
And between the winding ends 6 and the center wall 4 of the gutter body 8, which has an S-shaped cross section and has openings 7a and 7b forming water inlets, For example, central protrusions 9, 9 are provided so as to protrude from both sides of the central portion of the central wall 4 and can be engaged with the rolled ends.

Further, an opening 7 is provided on the outer surface of the empty chambers 5a and 5b.
The outer surface protrusions 10, 10 are located on the left and right sides of the opening 7b and extend in the axial direction. It is symmetrically protruded.

In order to form the bundled gutter aggregate 3, the aggregate of the blind drain gutters 1 having the above-mentioned configuration is made of iron wire or a tightness approximately equivalent to that of iron wire, taking into account the earth pressure at the buried site. Using binding material 2,
They are bound together at required intervals (for example, intervals of about 60 cm) and with the required tightening force. As a result of this binding, each of the blind drainage gutters is in a state in which the winding end portion 11 of the gutter body is elastically rolled inward and deformed at the binding site (to the maximum extent, the winding end 6 is in the central protrusion). This elastic deformation is transmitted in the longitudinal direction of the gutter body 8 via the protruding strips of the gutter body, thereby reducing the opening gap G in the intermediate portion 12 of the binding part. The intermediate portion 12 is designed to have enough rigidity to be able to withstand the earth pressure. Note that being able to withstand earth pressure means that the individual blind drainage gutters in a bundled state are able to withstand the earth pressure that they receive at their location. As a result of such a phenomenon in each blind drainage gutter, when the tied gutter assembly 3 is buried in the soil and subjected to earth pressure, the contact area 1 between the gutter bodies between the tied parts
3a, a linear water collection port 15 serving as a contact portion 13b between the gutter body and the protrusions, and a contact portion 13c between the protrusions,
It serves as a water collection port that allows almost only water to flow in, and each blind drainage gutter has its opening 7.
Water can flow into the empty chambers 5a and 5b from a and 7b, and this state is maintained.

To explain this with an example, the greater the earth pressure, the smaller the bundling interval and the stronger tightening of the bundling material, thereby reducing the reaction force against the earth pressure generated between the bundling parts. By increasing the reaction force and balancing the reaction force with the earth pressure, almost only water can pass through the contact areas between the gutter bodies, the contact areas between the gutter bodies and the ridges, and the contact areas between the ridges between the tied parts. An example is a case in which the water collection port is formed in a linear shape, and each blind drain gutter is configured so that water can flow into the cavity through its opening. Conversely, if the earth pressure is small, the reaction force against the earth pressure that should be generated between the binding parts may be small.
One example is the case where the binding interval is widened and the tightening force of the binding material is small.

The bundled gutter assembly 3 having the above configuration is as follows:
For example, as shown in FIG.
6 are placed in the excavation groove 19 in a state where they are sequentially connected by a connecting pipe 17, and the outside is surrounded by a filter layer 20 made of filter material such as gravel, cobblestone, sand, rice husk, etc. It is buried in the ground together with the layer 20.

However, when using the blind drainage method of the present invention,
Coarse particles are primarily filtered by the filter layer 20, and then fine particles such as sand and soil particles are secondarily filtered at each contact portion (linear water collection port) that functions as a filter. The water thus filtered flows into and into the cavities of each blind trough and flows through drains formed between the blind troughs and is drained at the ends thereof.

(Effects of the Invention) When using the blind drainage construction method according to the present invention, it is possible to construct a blind drainage construction that is adapted to the ground condition where blind drainage is to be performed and that maintains an effective collection and drainage effect for many years. A concrete explanation of this is as follows.

In other words, the blind drainage construction method according to the present invention involves assembling blind drainage gutters at the required intervals and with the required tightening force using binding materials with tightening stability while taking into consideration the earth pressure in the ground where blind drainage is to be performed. Linear water collection ports that function as filters are densely formed between the tied parts of the tied gutter aggregate, which is tied and buried in the soil and subjected to local earth pressure. The water collection port is kept in contact with the vacant room that serves as the waterway.

As a result, coarse particles in the ground are primarily filtered by the filter layer surrounding the bundled gutter aggregate,
After that, fine particles such as sand and soil particles are secondarily filtered at each linear water collection port that acts as a filter, and the ground water thus filtered flows into the empty space that serves as a waterway in each blind drainage gutter. but,
Since the inflow of soil particles into the cavity is prevented as much as possible, the reduction in the area of the water channel in the gutter body is small.

Note that the gutter area near the outer periphery of the bundled gutter aggregate tends to have a smaller waterway area than the gutter bodies inside, but even if the gutter bodies on the outer periphery become clogged after long days, as mentioned above, Since a large number of linear water collection ports and a large number of empty rooms are in communication with each other, the ground water is subjected to the filtration action at the linear water collection ports and sequentially enters the bundled gutter assembly by changing the flow path. flows in, flows down through the bundling gutter assembly, and is discharged. The more ground water flows into the cavity of the gutter body located inside, the more times it is filtered by the linear water collection port, so the reduction in waterway area is smaller, and fine particles such as sand and soil particles are bound together. In order to clog up to the center of the cross section of the gutter assembly, it is necessary to completely clog the many voids formed between the blind drain gutters by the cavities of the individual gutter bodies and the collection of blind drain gutters. , this will take many years.

For the reasons described above, according to the present invention, it is possible to construct a blind drainage structure that is adapted to the ground condition where blind drainage is to be performed and that maintains an effective collection and drainage effect for many years.

The bundled gutter assembly used in the present invention is constructed by bundling together blind drain gutters, each of which is an independent entity, so it is possible to reduce the number of blind drain gutters by optimizing the number of blind drain gutters required. It is possible to easily form a bundled gutter assembly that is suitable for the amount of collected water in the ground.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a part of the bundled gutter assembly used in the present invention together with connecting pipes, Fig. 2 is a partial perspective view showing an example of a blind drain gutter, and Fig. 3 shows the state in which the tied blind gutter is used. FIG. 1... Blind drainage gutter, 2... Binding material, 3... Binding gutter assembly, 4... Center wall, 5a, 5b... Vacant room, 6
... Winding end, 7a, 7b ... Opening, 8 ... Gutter body, 9 ... Center protrusion, 10 ... External protrusion, 1
DESCRIPTION OF SYMBOLS 1... Winding end part, 12... Middle part of a binding part, 13a, 13b, 13c... Contact part, 15...
... Water collection port, 19 ... Excavation groove, 20 ... Filter layer.

Claims (1)

[Claims] 1. Two adjacent cavities 5a and 5b that form a waterway by winding both ends of the central wall 4 in opposite directions.
is formed, and openings 7a and 7b serving as water inlets are formed between the winding end 6 and the center wall 4, and the gutter body 8 has an S-shaped cross section. Between the ends 6, 6, central protrusions 9, 9 are provided so as to protrude on both sides, and on the outer surface of the empty chambers 5a, 5b, on the left and right of one opening 7a and on the left and right of the other opening 7b. A large number of blind drain gutters 1 made of hard synthetic resin each having ridges 10, 10, 10, 10 on the outer surface extending in the axial direction are arranged in a stable circular shape, and The collection of blind drainage gutters 1 is tied together at the required intervals and with the required tightening force using iron wire or a binding material 2 having approximately the same tightness as iron wire, taking into account the earth pressure at the buried site. As a result of this binding, for each blind drainage gutter, at the binding site, the wrapped end portion of the gutter body is elastically rolled inward and deformed, and This entrainment elastic deformation is transmitted in the longitudinal direction of the gutter body, thereby making the space between the openings in the middle part 12 of the binding part such that it can ensure water inflow even when subjected to earth pressure. The rigidity of the intermediate part is made to be able to resist earth pressure, and as a result of this phenomenon in each blind drainage gutter, when the bundled gutter assembly 3 is buried in the soil and subjected to earth pressure, the bundled gutter The linear water collection port 15 serving as the contact area between the gutter bodies, the contact area between the gutter body and the protrusions, and the contact area between the protrusions between the parts becomes a water collection port that allows almost only water to pass through, In addition, water can flow into the empty space from the opening of each blind drain gutter, and this state is maintained, and this bundled gutter assembly is connected to the excavated groove 19. This blind drainage construction method is characterized in that the outside is surrounded by a filter layer 20 made of filter materials such as gravel, cobblestones, sand, and rice husks, and is buried in the soil.