JPH02173488A - Foundation bed for buried pipe - Google Patents

Abstract

PURPOSE:To prevent a pipe from generating a crack due to a decrease of rigidity of the foundation by filling the inside of a foundation bed of almost U-shaped section, arranged on the ground and wide uniformly transmitting a load, with a supporting material for supporting a Hume pipe. CONSTITUTION:In the case of a buried pipe foundation bed 2 for supporting a Hume pipe 1, the foundation bed 2 is arranged on the ground 7 and formed in a shape of almost U-shaped section providing a seat board 21 uniformly transmitting a load to the ground 7 and a side wall 22 in both ends in the lengthwise direction of the board 21. The foundation bed 2 is filled in its inside with a supporting material 3, for instance, sandy soil of grain sand, grits, etc., supporting the Hume pipe 1. As the result, the supporting material, supporting the pipe, is prevented from moving, so that the pipe, even after its execution, is surely supported and prevented from generating a crack.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a foundation for buried pipes, and more specifically,
The purpose is to secure support for the Huum pipe to develop an appropriate load-bearing capacity, or to widely and evenly distribute the load acting on the foundation ground from the pipe, and to prevent the Huum pipe from sinking due to peripheral frictional force. This article relates to a foundation for buried pipes.

"Conventional technology" Sand foundations are used as supporting materials for the foundations of Huyum pipes, and there are two types of foundations: sand foundations that support the Huyum pipes with this earth and sand, and concrete foundations that support the Huyum pipes by wrapping them in concrete. be. Of these, the former type of sand foundation is mainly used on good quality ground, but when used on soft ground, it is
As shown in the previous section, a ladder-bodied wooden foundation is sometimes used, and this consists of two parallel vertical timbers C placed below the Huyum pipe a and a horizontal timber sill that crosses and straddles them. It is something.

``Problem to be Solved by the Invention'' By the way, it is said that the weight of the pipe underground, water droplets, and earth pressure acting on the pipe tend to be concentrated at the bottom of the pipe and transmitted to the ground. In order to equalize the concentration of this load on the ground, a cross-shaped ladder-shaped foundation is used.

However, even with this foundation, the load transmitted to the ground is vertical and
Concentration in the horizontal timbers sometimes caused the pipe to sink.

In addition, in construction work in which a hump pipe is installed using earth retaining materials such as sheet piles, when pulling out the earth retaining materials after backfilling, as shown in Fig. of earth and sand flowed in, and even the earth and sand e supporting the Huum tube moved, making it no longer possible to adequately support the Huum tube, reducing the load-bearing capacity of the tube and causing cracks in the tube.

In particular, when a ladder trunk foundation is used, the risk is even higher because the earth and sand that supports the pipes moves, and the pipes are supported only by the horizontal timbers, creating a concentrated load.

On the other hand, when constructing the latter type of concrete foundation described in the conventional technology, first, as shown in Fig. 8,
A layer of concrete (f) was poured to serve as a base for arranging the
It is best to wait for this curing period and then pour secondary concrete 1-g on top of it.

However, after pouring concrete 1-f, a curing period is required before the humid pipe can be placed, and if rapid construction is required, sufficient concrete 1-f is required.
There was a problem with cracks appearing in the concrete due to insufficient curing time. In addition, during the curing period of the next concrete 1~, soil and sand adhere to the surface of the concrete 1, and laitance builds up, so the adhesion with the secondary concrete 1 deteriorates, and the next concrete 1 is poured. As the rigidity of the concrete foundation decreases due to peeling or movement at the joint surface, there is a problem in that the load-bearing capacity of the tube decreases and cracks occur in the tube.

Therefore, the object of the present invention is to provide a foundation for buried pipes devised in view of various problems with varnishing.

``Means for Solving the Problems J'' In order to achieve the above object, the foundation in the present invention is arranged on the ground 7, and has side walls 22 at both longitudinal ends of the bottom plate 21 that widely and evenly transmits the load to the ground 7. The structure is such that a support material 3 for supporting a hume pipe 1 is filled in a foundation 2 having a substantially U-shaped cross section.

Further, the bottom plate 21 may be provided with a drainage hole 2a for water tightening.

Furthermore, a foundation 2 is provided instead of the side wall 22 and the support member 3.
Concrete 1-6 for supporting the fume pipe 1 may be placed inside.

"Action J The foundation 2 with the above configuration is based on the weight of the Huum pipe 1.

The water drop and the soil over the pipe are transmitted to the ground 7 through the bottom slab 21 of the foundation 2 in Fig. 5, but this bottom slab 21
Since it is a flat plate with no large gaps like a ladder trunk, the load is transmitted widely and evenly to the ground, and the rate of sinking of the pipe due to surrounding frictional force is reduced.

In addition, the foundation 2 is formed into a U-shape with side walls 22 on both sides of the bottom slab 2■, and the support material 3 that supports the humid pipe 1 is filled in this structure, so that earth and dirt can be removed by pulling out the sheet piles 8, etc. As shown in FIG. 5, the range of influence on the pipe no longer extends to the support member 3 that supports the pipe, and the hume pipe 1 is supported at a predetermined support angle even after the sheet pile is pulled out.

On the other hand, if this foundation is used to create a concrete foundation as shown in Figure 4, there is no need to pour the concrete F cast in place in Figure 8, so the construction period can be shortened, and the U-shaped Concrete 1. and foundation 2. Since the adhesion area with the side wall 22 is large, and the side wall 22 acts as shear resistance even against the force of peeling and lateral slippage, a foundation in which the hume pipe 1 and concrete are reliably integrated can be obtained, making the hume pipe 1 safe. can be supported.

"Example" Examples will be described with reference to the drawings.

In FIGS. 1 to 4, the foundation 2 is placed on the ground 7'', and is a bottom plate that transmits the load widely and evenly to the ground 7, and reduces the sinking of the hump pipe 1 by the surrounding frictional force. 21, and side walls 22 are provided at both ends of the bottom plate 21 in the longitudinal direction, so that the bottom plate 21 has a substantially U-shaped cross section.

Moreover, when widening the supporting range of the hume tube 1, the side wall 22 may be made higher as shown in FIG.

Further, for example, as shown in FIG.
It is also possible to obtain the same effect as when the side walls are made higher by connecting them with predetermined fixing means such as bolts 4 or adhesives.

Furthermore, the supporting material 3 may be water-tightened, and in this case, the bottom plate 21 may be provided with a drain hole 24 for draining water.

The support material 3 is filled in the foundation 2 to support the humid pipe 1, and this support material 3 is made of sandy soil such as granular sand or gravel.

FIG. 4 shows the case where the supporting material 3 is made of concrete. For construction, first place the foundation 2, then
The hume pipe 1 is placed at a predetermined position, and concrete 6 is poured using the formwork 53. In order to further strengthen the adhesion with the cast-in-place concrete 6, holes 52 may be provided in the bottom slab 21 to prevent rainwater from accumulating in the formwork 5.1 before pouring the cast-in-place concrete 6.

"Effects" Since the present invention is configured as described above, it produces the effects described below.

In construction work that involves pulling out earth retaining materials, the support materials that support the pipes are prevented from moving, so the pipes are securely supported even after construction, and no cracks occur.Furthermore, when used on soft ground, Since there is no void at the bottom like the shiko trunk, it can be used as a scaffold for work such as joining humid pipes, making construction easier.

Furthermore, after construction, the load acting on the foundation ground of the entrance pipe is evenly distributed, which reduces the subsidence of the pipe and reduces the obstruction to the flow of water within the pipe.

On the other hand, when a concrete foundation is used as a foundation, it not only simplifies construction because there is no need to pour concrete twice on site, but also improves adhesion resistance and shear resistance with concrete poured on site. Since the foundation is placed in the opposite direction, the integration of the foundation and the cast-in-place concrete 1 is prevented, and the humid pipe can be supported reliably and safety can be ensured.

As described above, by using this foundation, problems in construction can be prevented and the multi-mu pipe can be safely supported, regardless of whether the supporting material for the multi-mu pipe is sand or concrete.

[Brief explanation of the drawing]

Figures 1 to 5 relate to the present invention. Figure 1 is a front cross-sectional view of the arrangement of the foundation for buried pipes of the present invention, and Figure 2 is a cross-sectional view in the front direction of the arrangement of the foundation for buried pipes of the present invention, and Figure 2 is a high side wall to widen the support range of the Hume pipe. Figure 3 is a cross-sectional view of the main part when the upper side wall is attached to the side wall, Figure 4 is a cross-sectional view of the main part when concrete support is used, and Figure 5 is a cross-sectional view of the main part when the upper side wall is attached to the side wall. An explanatory diagram of the movement of the support material, Fig. 6 A is a front view of a conventional ladder trunk foundation, the opening in the same figure is a side view, Fig. 7 is an explanatory diagram of the movement of the support + A by conventional sheet pile pulling, Fig. 8 is a front view of a conventional cast-in-place concrete foundation. 1; Huyum pipe, 2; Foundation stand, 3; Supporting material, 21;
Bottom plate, 22; side wall.

Claims (1)

[Scope of Claims] 1. A support member for supporting a Hume pipe in a foundation having a substantially U-shaped cross section and having side walls at both ends of the bottom plate in the longitudinal direction, which is placed on the ground and widely and evenly transmits the load to the ground. A foundation for buried pipes filled with 2. The foundation for buried pipes according to claim 1, wherein the bottom plate is provided with drainage holes for water tightening. 3. The foundation for a buried pipe according to claim 1, wherein concrete for supporting the Hume pipe is placed in the foundation instead of the supporting material.