JPS60212511A - Drainage structure by culvert - Google Patents

Abstract

PURPOSE:To decrease a term of works, by a method wherein a branch pipe member is disposed opposite to a main pipe member, and the water gradient of each branch pipe member is set to a value about equal to that of the branch pipe member located on the upper stream end side of the main pipe member. CONSTITUTION:During a rainfall, each branch pipe member 3 collects rainwater penetrating through surface soil 15 and a filter part 16 formed by a filter member such as crushed stones. The collected rainwater flows through the branch pipe member 3 and is discharged from a drainage end 11. The drained water penetrates through a filter member 17 in an excavated groove 6, and flows through a main pipe member 2 and discharged through a drainage end into a water collection inlet 8. This, since the water gradient of each branch pipe member 3 is about equal to the water gradient, i.e., a minimum water gradient, of a branch pipe member 3a, positioned on the upperstream end side of the main pipe member 2, causes uniform and rapid drainage of rainwater throughout the whole of a ground G.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a main pipe member and a branch pipe member disposed toward the main pipe member, and the water gradient of each branch pipe member is directed toward the upstream end of the main pipe member. By setting the water gradient approximately equal to the water gradient of branch pipe members located in The present invention relates to an underdrain drainage structure that allows water to be drained almost evenly and quickly.

A conventional underdrain drainage structure in which a branch pipe member for underdrain drainage is connected to a main pipe member for underdrain drainage is shown in FIG. 5(a).

As shown in Cb), the main pipe member (b) is arranged at a constant slope in the excavated groove (a) for the main pipe member, and the drainage end (d) of the branch pipe part (c) is connected to the main pipe member. (b), each excavated groove (θ) and
... had to gradually increase the slope from the upstream end to the downstream end of the main pipe member (b). Therefore, it was necessary to perform construction management such as slope control for each excavation trench, and the larger the slope, the deeper the excavation trench had to be, so the amount of soil excavated towards the downstream side of the main pipe member increased. has increased significantly. In addition, the deeper the excavation trench, the deeper the buried position of the branch pipe member, which not only required a great deal of effort but also the filter materials (rough sand, crushed stone, etc.) that should be placed around the branch pipe member. The need for materials to form drainage spaces such as sheds has increased.As a result, construction costs such as construction management costs, earthwork costs, and material costs are extremely high in conventional culvert drainage structures. In addition, since the slope of each branch pipe member is different, the distance between the ground surface (f) and the branch pipe member (Q) varies depending on the location, and there is a problem that the construction period is prolonged. From a point of view, the drainage became extremely uneven, and it took a considerable amount of time for the ground and other areas that received drainage to become usable.

The present invention aims to provide an underdrain drainage structure that solves such problems, and in which the main pipe member for underdrain drainage is buried at a constant water gradient, and the drainage end is located above the main pipe member. Each branch pipe member for underdrain drainage buried at a predetermined interval is arranged at a water gradient that is approximately equal to the water gradient of the branch pipe member located on the upstream end side of the main pipe member, and the said drainage of the branch pipe member is It is characterized by allowing drainage from the end to enter the main pipe member, and one embodiment of the system will be described below, taking as an example the case where it is applied as a ground culvert drainage structure.
The explanation will be based on the drawings.

1 to 3, the underdrain drainage structure of the present invention includes a main pipe member (2), and branch pipe members (3) arranged toward the main pipe member (2), Both the main pipe member (2) and the branch pipe member (3) use various known underdrain collection and drainage systems (A) that can efficiently collect water from the entire circumference, and the main pipe member (2) is a branch pipe member. Compared to member (3), it is generally thicker by 31 mm.

The main pipe member (2) is arranged in an excavated groove (6) for the main pipe member, which is excavated at a constant water gradient so as to cross the substantially central part of the ground base (5), at the full slope, Its drainage end (7) is contained within the water collection +Jt (8). Note that a filter material (for example, crushed stone) 03 is laid down to a predetermined thickness below the main pipe member (2) in order to facilitate water permeation into the main pipe member (2) from below.

On the other hand, each branch pipe member (3)... has an excavated groove 0 ( to·
・It is arranged with a substantially constant water gradient so that its drainage end 0υ is located above the main pipe member (2). The water gradient of each school pipe member (3) is approximately equal to the water gradient of the branch pipe portion 4A (8a) located on the upstream end a4 side of the main pipe member (2), for example, about 8/8 The slope is set to about 5/1000. Therefore, each excavation groove αO... is also excavated at the same slope,
For the same reason as in the case of the main pipe member (2), filter material (
For example, crushed stone) 03 is laid down to a predetermined thickness. In addition, in the excavation groove (6) for the main pipe member and the excavation groove 01 for the branch pipe member,
Filling with filter material (for example, crushed stone) 01,
In this example, in particular, the surface of the ground base (5) is covered with a filter material (for example, crushed stone) Q3 of an appropriate thickness, and a sandy surface soil 00 with excellent water permeability is placed on top of the filter material (for example, crushed stone). , to obtain Ground 0 in which the underdrain drainage structure of the present invention is incorporated underground.

However, during rain, each branch pipe member (3)...
Filter part O consisting of surface soil 00 and filter material α east
The rainwater that permeates through the Q is efficiently collected, the collected rainwater flows through the branch pipe member (3), and is discharged at its drainage end θυ. The discharged rainwater permeates through the filter part αη in the excavated groove (6) in a short time, enters into the main pipe member (2), flows inside the main pipe member (2), and is drained. At the end (7) it is discharged into said water collection basin (8). Note that the distance between the drainage end (7)... of each branch pipe member (3) and the main pipe member (2) is on the upstream end (b) side of the main pipe member (2), but Since the filter part a''i) has very good water permeability, even in the vicinity of the downstream end of the main pipe part ah!1(2), water is discharged from the drainage end of the branch pipe member. Although rainwater permeates into the main pipe section (O (2)),
It doesn't take much time. Also, since the water gradient of each school pipe member (3)... is approximately equal to the water gradient of the branch pipe member (3a) located +1 on the upstream end side of the main pipe member (2), that is, the minimum water gradient, Drainage will be carried out almost evenly and quickly over the entire ground 0, and the ground 0 will be ready for use within a short time after the rain has stopped.

In particular, in this embodiment, since the filter material 01 is also laid on the ground base (5), rainwater can be drained more quickly.

In this way, the underdrain drainage structure of the present invention includes a main pipe member (2) and a branch pipe member (2) disposed toward the main pipe member (2).
3), and the water gradient of each branch pipe part (O (3) is set approximately equal to the water gradient of the branch pipe member (3a) located on the upstream end (B) side of the main pipe member (2). Therefore, when forming each excavation groove On... for branch pipe members, it is sufficient to excavate each excavation groove OI... with approximately the same slope. There is no need for management, etc., and construction management is extremely simple, resulting in excellent workability.

■ The water gradient of each excavation groove 00 for branch pipe members should be set to the water gradient of the excavation groove located on the upstream end (6) side of the main pipe member (2), that is, the minimum water gradient. Therefore, the amount of excavation can be reduced. Therefore, compared to the case of the conventional structure in which the slope had to be gradually increased from the upstream end CI to the downstream end axis of the main pipe member (2), earthwork costs can be significantly reduced. At the same time, construction efficiency can be improved.

Φ) The depth of the excavated groove 00 for each branch pipe member is shallower than in the conventional structure, so less filter material is required, reducing material costs and burying effort. Vine.

■Furthermore, since the water gradient of each branch pipe member (3) is set approximately equal to the minimum water gradient as described above, the branch pipe member (3)... , it was buried in a shallow area and at a temporary depth,
Drainage of drained places such as the ground is carried out timely and promptly, and the ground etc. can be made usable within a short time after the rain has stopped.

As a result of the underdrain drainage structure of the present invention configured as described above,
Compared to conventional structures, construction can be made more efficient, the construction period can be shortened, construction costs can be reduced, and the entire drainage area, such as the ground, can be drained in a timely and prompt manner. Become.

In addition, in the underdrain drainage + IIt structure of the present invention, the branch pipe member (
As shown in the example, the structure of 3) that allows the drainage from the drainage end 0υ to enter the main pipe member (2) is as follows.
In addition to filling the excavated groove (6) for the main pipe member with filter material θ to the extent that the drainage end C1υ is buried, as shown in Fig. 4, the filter material θ is filled to the extent that the main pipe member (2) is buried. The filter material θ1 is filled in the excavated groove (6), and the drainage end aυ and the filter part are connected by a conduit Qυ, so that the drainage from the drainage end Qυ is connected to the main pipe member (2). ) may be employed in various configurations to allow easy entry into the interior of the vessel. Further, the arrangement of the main pipe member (2) and the branch pipe members (3) can be arbitrarily set according to the topography of the place to be drained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main part of an embodiment of the present invention before backfilling, FIG. 2(a) is a sectional view of the upstream side of the main pipe member in the structure of the present invention, and FIG. 214(b) is a A sectional view of the downstream side of the main pipe member, Fig. 8 is a plan view showing the arrangement of the main pipe member and the branch pipe member before backfilling, and Fig. 4 shows the drainage end of the branch pipe member by using a conduit. Fig. 5(a) is a sectional view of the upstream side of the main pipe member in the conventional structure; Fig. 5(b)
is a sectional view of the downstream side of the main pipe member in the conventional structure. (2)... Main pipe member, (3)... Branch pipe member, aη・
... Drainage end of branch pipe member. Patent applicant: Shirataka Kogyo Co., Ltd. Agent Patent attorney: Seiichi Okamoto 67- Figure 2 (b) Figure 2 (a) Figure 3 Figure 4 Figure 5 (b) Figure 5 (a)

Claims (1)

[Claims] Underdrain drainage where the main pipe member (2) for underdrain drainage is buried at a constant water gradient, and at a predetermined interval so that the drainage end (b) is located above the main pipe member (2). A branch pipe member (3) ... is arranged at a water gradient approximately equal to the water gradient of the branch pipe member (3a) located on the upstream end side of the main pipe member (2), and ) said drainage end (6) of
An underdrain drainage structure characterized by allowing drainage from the main pipe member (2) to enter the main pipe member (2).