JPH0615910B2 - Foundation base for buried pipes - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a base for a buried pipe, and more specifically,
The purpose is to secure a bearing for the fume tube to develop an appropriate load-bearing capacity, or to spread the load acting on the foundation ground from the tube widely and evenly, and to prevent the fume tube from sinking due to the peripheral frictional force. It relates to the foundation for buried pipes.

[Prior art]

There are two types of foundations for fume pipes: sand foundations that support sand and fume pipes, and concrete foundations that support the fume pipes by rolling concrete. Of these, the former sand foundation is mainly used for good quality ground, but when it is used for soft ground,
As shown in (b), the foundation of a chopsticks trunk may be used in combination, and two parallel vertical timbers c and horizontal timbers b crossing this are placed under the fume tube a. It is a thing.

[Problems to be Solved by the Invention]

By the way, it is said that the weight of the pipe itself, the water weight, and the earth pressure applied to the pipe in the ground tend to be concentrated on the bottom of the fume pipe and transmitted to the ground. Therefore, in soft ground, the concentration of this load is equalized. For this reason, we have used the girder-shaped chopstick foundation. However, even with this foundation, the load transmitted to the ground is
Since it concentrated on the horizontal timber, it sometimes caused the settlement of the pipeline. In addition, in the construction in which the fume pipe is laid by using the soil retaining material such as sheet pile, when the soil retaining material is pulled out after backfilling, as shown in FIG. The soil and sand flowed in, and even the sediment e supporting the fume tube moved, and it became impossible to sufficiently support the fume tube, and the load bearing capacity of the tube decreased, and the tube sometimes cracked. In particular, when the foundation of the ladder body is used, the movement of the earth and sand supporting the pipe causes the pipe to be supported only by the horizontal lumber, which causes a concentrated load, which further increases the risk. On the other hand, when constructing the latter concrete foundation described in the conventional technique, first, as shown in FIG.
Place the primary concrete f, which will be the base for arranging
It is general to wait for this curing period and then pour the secondary concrete g on it. However, after placing the primary concrete f, a curing period is required until the fume pipe can be placed. If rapid construction is required, sufficient curing period cannot be taken for this concrete. There was a problem of cracking. Also during the curing period of the primary concrete,
Since earth and sand adhere to the surface of the concrete and the leitance adheres, the adhesion with the secondary concrete g deteriorates, and the rigidity of the concrete foundation decreases due to the secondary concrete peeling off at the joint surface or moving. Accordingly, there is a problem that the load bearing capacity of the pipe is reduced and the pipe is cracked. Therefore, an object of the present invention is to provide a buried pipe foundation that has been devised in view of the above problems.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the foundation base in the present invention is arranged on the ground 7, and the load is widely and evenly distributed.
The base material 2 having side walls 22 provided at both ends in the longitudinal direction of the bottom slab 21 and having a substantially U-shaped cross section is filled with a support material 3 for supporting the fume tube 1. Further, the bottom plate 21 may be provided with a water drain hole 24 for water tightening. Further, as the support member 3, a fume tube 1 is installed in a base 2.
It is also possible to place concrete 6 that supports the.

[Action]

In the foundation having the above structure, the weight of the fume tube 1, the water weight, and the earth pressure applied to the tube are transmitted to the ground 7 through the bottom plate 21 of the base 2, and the bottom plate 21 has a large size like a ladder tree. Since it is a flat plate with no voids, the load is widely transmitted to the ground evenly, and the rate of pipe subsidence due to peripheral frictional forces is reduced. Further, since the base 2 is formed in a U shape by providing the side walls 22 on both sides of the bottom plate 21 and the supporting material 3 for supporting the fume tube 1 is filled therein, the base 2 is pulled to the earth and sand by pulling out the sheet pile 8 or the like. As shown in FIG. 5, the affected range does not reach the support member 3 that supports the pipe, and the fume pipe 1 is supported at a predetermined support angle even after the sheet pile is pulled out. On the other hand, when the base 2 is used as a concrete foundation as shown in FIG. 4, it is not necessary to place the concrete f cast on site in FIG. As a result, the adhesion area between the concrete and the base 2 can be wide, and the side wall 22 has a shear resistance against the force of peeling lateral displacement, so that the foundation in which the fume pipe 1 and the concrete are integrated can be reliably obtained. , The fume tube 1 can be supported safely.

【Example】

Examples will be described with reference to the drawings. In FIGS. 1 to 4, the base 2 is arranged on the ground 7, and the load is widely and evenly transmitted to the ground 7, and the bottom slab 21 reduces the subsidence of the fume tube 1 by the peripheral frictional force. Are arranged, and side walls 22 are provided at both ends in the longitudinal direction of the bottom plate 21 to have a substantially U-shaped cross section. Further, when the support range of the fume tube 1 is to be wide, the side wall 22 may be raised as shown in FIG. Also, for example,
As shown in FIG. 3, the upper side wall 23 may be fixed to the side wall 22 by the bottle 4 and connected by a predetermined fixing means such as adhesion so that the same effect as when the side wall is raised may be obtained. Further, the support member 3 may be water-tightened, and in this case, the bottom plate 21 may be provided with a water drainage hole 24 for draining water. The support material 3 is filled in the base 2 to support the fume tube 1, and the support material 3 is made of sandy soil such as granular sand or gravel. FIG. 4 shows a case where the support material 3 is concrete. In the construction, first, the base 2 is arranged and constructed, then the fume pipe 1 is arranged at a predetermined position, and the concrete 6 is poured using the form 53. On the bottom slab 21 is cast concrete 6
In order to further strengthen the adhesion to the concrete, holes 52 may be provided in the formwork 53 before the pouring concrete 6 to prevent rainwater from collecting.

【effect】

Since the present invention is configured as described above, it has the effects described below. In the construction that involves pulling out the soil retaining material, the support material that supports the pipe is prevented from moving, so that the pipe is securely supported even after construction and no cracks occur. In addition, when used on soft ground, since there is no void at the bottom like a ladder body, it becomes a scaffold for work such as joining of fume pipes, and construction is easy. Furthermore, after the construction, the load acting on the foundation ground of the Hume pipe is evenly distributed, so that the settlement of the pipeline is reduced and the flow of water in the pipeline is less obstructed. On the other hand, when this foundation table is used as a concrete foundation, it is not necessary to pour the concrete twice at the site, so not only can the construction be simplified, but the base is formed in a U shape, Since the adhesion resistance with the concrete and the shear resistance are improved, the base and the cast-in-place concrete are integrated, and the fume pipe is securely supported,
It is possible to ensure safety. As described above, by using this foundation stand, construction problems can be prevented and the fume pipe can be safely supported regardless of whether the support material for the fume pipe is sand or concrete.

[Brief description of drawings]

FIGS. 1 to 5 relate to the present invention. FIG. 1 is a cross-sectional view of the buried pipe foundation of the present invention in an arrangement state frontal direction, and FIG. 2 shows a high side wall to widen the fume pipe support range. Fig. 3 is a cross-sectional view of the main part when the upper side wall is attached to the side wall, Fig. 4 is a cross-sectional view of the main part when a concrete support material is used, and Fig. 5 is the sheet pile extraction. FIG. 6A is a front view of a conventional chop board trunk foundation, FIG. 6B is a side view of the same, and FIG. 7 is an explanatory view of movement of the conventional support material by pulling out a sheet pile. FIG. 8 is a front view of a conventional cast-in-place foundation. 1; Hume pipe, 2; Base, 3; Support material, 21; Bottom plate,
22; Side wall.

Claims (3)

[Claims] 1. A support material for supporting a fume tube is filled in a base having a substantially U-shaped cross section, which has sidewalls provided at both longitudinal ends of a bottom slab which is placed on the ground and transmits a load widely and evenly to the ground. Foundation base for buried pipes with a structure. 2. The foundation pipe for a buried pipe according to claim 1, wherein the bottom plate is provided with a water drainage hole for water tightening. 3. The buried pipe foundation according to claim 1, wherein concrete for supporting the fume pipe is placed as a supporting member in the base.