JPH0742720B2 - Unequal settlement of pipelines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing uneven settlement of pipelines.

[0002]

2. Description of the Related Art When sewage pipes and other pipelines are buried in the ground, in order to prevent displacement, breakage, cracking, etc. of the pipeline connection due to uneven settlement of the pipeline in the ground. ,
Conventionally, the uneven settlement preventing method as shown in FIG. 3 and FIG. 4 has been performed.

That is, 1 is an excavation groove, which is dug from the ground 2 to a predetermined depth D. A plurality of ladder trunks (ladder-shaped foundation materials) 4 are continuously laid on the bottom portion 3 of the excavation trench 1. Each of the ladder trunks 4 is composed of two vertical bars 5 made of drum-shaped wood in cross section and three horizontal bars 6 made of drum-shaped wood in cross section. That is, one ladder body 4
Three horizontal bars 6 are placed on the two parallel vertical bars 5 at predetermined intervals and fixed, and the vertical bars 5 and the horizontal bars 6 are assembled in the excavation groove 1. Vertically divided connecting parts 7 and 8 are formed at both ends of the vertical tree 5 in a staggered manner, and a pin 10 is passed through a hole 9 of the connecting part 7 and 8 to form an adjacent ladder body 4 You can connect each other.

After the ladder trunk 4 having such a structure is continuously laid on the bottom portion 3 of the excavation trench 1, a pipe line 11 such as a sewer pipe is placed thereon, and finally the soil is excavated in the excavation trench 1. It is to be buried by inserting.

[0005]

However, in such a conventional technique, the ladder trunk is constructed by placing the crossbar 6 having the height d ₂ on the vertical tree 5 having the constant height d _1. 4, the overall height D ₂ of the ladder trunk 4 is increased, and the excavation groove 1 must be dug accordingly. That is, the depth of the conduit 11 itself from the ground 2 is D ₁
Therefore, as the depth D ₂ occupied by the ladder body 4 increases,
The depth D of the excavation groove 1 increases. When the depth D of the excavation groove 1 increases, the excavation work, soil retention work, backfill work,
This is not preferable because it increases the burden of residual soil processing work.

Further, since the vertical bar 5 and the horizontal bar 6 are assembled in the excavation groove 1, the construction period tends to be long.

[0007] It is also conceivable that the horizontal bar 6 is not placed on the vertical bar 5, but the horizontal bar 6 is sandwiched between the vertical bars 5 so that the heights of the both are the same. If the connection between 6 and the vertical bar 5 is a little and there is a difference in height between the horizontal bar 6 and the vertical bar 5, a gap is created between the pipeline 11 and the horizontal bar 6, and This is not realistic because the load transmission to the vertical tree 5 becomes uneven and the straightness of the pipe line 11 becomes difficult.

The present invention has been made by paying attention to such a conventional technique, and it is possible to make the depth of the excavation groove smaller and to shorten the construction period. It provides a prevention method.

[0009]

In order to achieve the above-mentioned object, a method for preventing uneven settlement of a pipeline according to the present invention has a plurality of ladder-like members in which horizontal members are provided between parallel vertical members at predetermined intervals. A method of preventing uneven settlement of a pipeline by laying a base material continuously on the bottom of a trench and arranging and burying the pipeline on the base material, wherein the base material has a vertical member and a horizontal member. It is an integrally molded product having the same planar bottom surface, and the height of the surface of the horizontal member on which the conduit is placed is not more than the upper surface of the vertical member.

Here, the "integrally molded product" means a product integrally formed by a molding die. The material is preferably an immortal material such as resin or concrete.

[0011]

Since the vertical member and the horizontal member of the base member have the same planar bottom surface and the height of the surface of the horizontal member on which the pipeline is placed is less than or equal to the upper surface of the vertical member, the height of the base member is It becomes smaller, and the depth of the excavation groove can be made smaller accordingly. Further, since the integrally formed base material is used in advance, it is not necessary to assemble the base material in the excavation groove, and the construction period can be shortened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the prior art are designated by the same reference numerals, and a duplicate description will be omitted.

The ladder-shaped base material 12 according to this embodiment is an integrally molded product (molded product) made of plastic. The base material 12 includes two vertical members 13 and three horizontal members 14, both of which have the same height d ₂ (this height is substantially equivalent to that of a conventional horizontal bar). That is, both are members having a rectangular cross section, and have a structure in which the horizontal members 14 are formed on the side surfaces facing each other inside the vertical member 13. Therefore, the vertical member 13 and the horizontal member 14 have the same flat bottom surface 15. Further, the upper surfaces of the vertical member 13 and the horizontal member 14 are flat and the same surface,
On the upper surface of the lateral member 14, a curved portion 14a corresponding to the lower surface of the conduit 11 is formed as a "surface on which the conduit is placed". The curved surface 14a is recessed in the upper surface of the lateral member 14, and the lowest portion of the curved surface 14a is lower than the height of the upper surface of the vertical member 13. The curved surface 14a allows the lower surface of the conduit 11 to be supported in a close contact state.

Of the end portions of the vertical member 13, a tenon portion 16 is formed on one side and a tenon receiving portion 17 is formed on the other side, and the tenon portion 16 and the tenon receiving portion 17 have an insertion hole 18. Each is formed. And the adjacent base material 1
By inserting the tenon portion 16 of the second into the tenon receiving portion 17 of the other base material 12 and tightening the nut 20 to the bolt 19 that has passed through the insertion holes 18 of both, the adjacent base materials 12 can be connected to each other. Has become.

After the base material 12 having such a structure is continuously laid on the bottom portion 22 of the excavation groove 21, the pipe line 11 is formed.
Is placed on top of it, and finally the soil is put in the excavation groove 21 to be embedded. The depth F of the excavation groove 21 of this embodiment is
Is shallower than the conventional one. That is, since the entire height of the base material 12 is d ₂ , the extra amount of digging than the set depth D ₁ of the pipeline 11 from the ground 2 is the height d ₂ (strictly Since the distance between the lowest portion of the curved portion 14a and the bottom surface 15) is sufficient, the excavation groove 21
The total depth F is less than the depth D of the conventional trench by d ₁ minutes. Therefore, as the depth F of the excavation groove 21 becomes smaller, the burden of excavation work, soil retention work, backfill work, residual soil treatment work, etc. is reduced.

Further, the prefabricated base material 12 integrally formed in advance.
Is installed in the excavation groove 21, so that the excavation groove 2 can be formed in the conventional manner.
There is no need to assemble the base material 12 within 1,
It is possible to shorten the construction period.

Further, since the base material 12 is an integrally molded product, even if the load of the conduit 11 is applied to the lateral member 14, the lateral member 14 does not shift with respect to the vertical member 13, and the conduit 11 does not move.
It is possible to reliably prevent unequal subsidence and to maintain the linearity of the conduit 11. Moreover, the horizontal member 14 and the vertical member 1
Since 3 and 3 have the same flat bottom surface 15, the ground contact area with respect to the bottom portion 22 of the excavation groove 21 is large, and more reliable prevention of uneven settlement of the pipeline 11 can be achieved.

In addition, since the base material 12 is made of a plastic, which is an immortal material, the unequal subsidence prevention performance of the pipe line 11 does not deteriorate even if it is buried for a long time. In this embodiment, an ordinary plastic is taken as an example, but it may be waste plastic, resin other than plastic, concrete or the like.

Further, in this embodiment, a plurality of base materials 12 are used.
Although an example of connecting and using the above is shown, it is not always necessary to connect and may be laid under the conduit 11 so as to be "continuously" arranged in a non-connected state. Furthermore, although the sewer pipe is taken as an example of the pipe line 11, other pipes may be used. The connecting means in the case of connecting is not limited to the method using the tenon portion 16 and the tenon receiving portion 17, and any connecting means may be used.

[0020]

The method of preventing uneven settlement of a pipeline according to the present invention has the contents as described above, and the vertical member and the horizontal member of the base material have the same flat bottom surface and the horizontal member. Since the height of the surface of the member on which the pipeline is placed is less than or equal to the upper surface of the vertical member, the height of the base material is reduced, and the depth of the excavation groove can be reduced correspondingly. Further, since the integrally formed base material is used in advance, it is not necessary to assemble the base material in the excavation groove, and the construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an excavation groove showing a method for preventing uneven settlement of a pipeline according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a base material according to an embodiment.

FIG. 3 is a sectional view of an excavation groove showing a conventional method for preventing uneven settlement of a pipeline.

FIG. 4 is a perspective view showing a conventional base material.

[Explanation of symbols]

 11 Pipeline 12 Base material 13 Vertical member 14 Horizontal member 14a Curved surface (surface on which the pipeline is placed) 15 Bottom surface 21 Excavation groove 22 Bottom portion

Claims (1)

[Claims] 1. A plurality of ladder-shaped base materials, each having horizontal members provided at predetermined intervals between parallel vertical members, are continuously laid at the bottom of an excavation trench, and pipes are arranged and buried on the base materials. A method for preventing uneven settlement of pipes , in which the foundation material is composed of vertical members and horizontal parts.
Material is an integrally molded product that has the same planar bottom surface
A method for preventing uneven settlement of a pipeline, characterized in that the height of the surface of the material on which the pipeline is placed is not more than the upper surface of the vertical member .