JP7650202B2 - Secondary product foundation, manufacturing method of foundation - Google Patents

Description

The present invention relates to a secondary product foundation, at least a portion of which is buried underground, and a method for manufacturing the foundation.

Foundation blocks for installing a fence and a wall equipped with the foundation blocks are disclosed (see Patent Document 1). The wall consists of a wall base and a fence section. The wall base has a block connection body consisting of connected foundation blocks, and a weight block that is detachably placed on the foundation block. This wall does not have the foundation blocks buried in the ground, but is fixed to the ground by the weight block.

JP 2021-8773 A

However, when using foundations made of secondary concrete products to install buried protective walls or various foundations around existing facilities, there is a problem that the protective walls or foundations may interfere with cables (buried wiring) buried underground. For this reason, when buried wiring is present, measures can be taken such as relocating the buried wiring by laying it anew, or changing to a cast-in-place concrete foundation. However, moving buried wiring is time-consuming and costly. Furthermore, changing to a cast-in-place concrete foundation not only requires time for the concrete to cure, but also incurs separate design and manufacturing costs, resulting in increased installation costs.

SUMMARY OF THE PRESENT DISCLOSURE ... It is therefore an object of the present invention to provide a secondary product foundation and a method for manufacturing the foundation that can prevent interference with buried wiring.

The above problems are solved by the present invention described below.
That is, the secondary product foundation of the present invention (1) comprises an above-ground part provided on the ground,
a buried portion that is provided integrally with the above-ground portion and extends along the ground, at least a portion of which is buried in the ground, and has one or more slits for passing buried wiring on the side opposite to the side facing the above-ground portion;
Equipped with.

The secondary product foundation of the present invention (2) is the secondary product foundation according to (1), wherein the above-ground part is in the form of a plate having a predetermined thickness,
The one or more slits extend along the thickness direction of the above-ground portion.

The secondary product foundation of the present invention (3) is a secondary product foundation according to (1) or (2), in which the buried portion extends in a direction intersecting the direction in which the above-ground portion extends, and all of the buried portion is buried in the ground when installed.

The secondary product foundation of the present invention (4) is a secondary product foundation described in any one of (1) to (3) and is made of reinforced concrete.

The manufacturing method for a foundation of the present invention (5) is a manufacturing method for an installed foundation using a secondary product foundation having an above-ground portion in the form of a plate having a predetermined thickness, and a buried portion that is integral with the above-ground portion, extends along the ground surface, and is at least partially buried in the ground, the buried portion having one or more slits extending along the thickness direction of the above-ground portion on the side opposite to the side facing the above-ground portion,
forming a hole in the ground so as to excavate the buried wiring from the ground by a length greater than the length of the buried portion in the thickness direction of the above-ground portion;
The buried wiring is deflected to any one of the one or more slits of the buried portion within the hole portion;
The buried wiring is positioned inside any one of the one or more slits, and the secondary product foundation is installed on the ground so that at least a portion of the buried portion is buried in the hole.

The method for manufacturing a foundation of the present invention (6) is the method for manufacturing a foundation according to (5), wherein the buried portion extends in a direction intersecting the direction in which the above-ground portion extends,
When installing the buried portion on the ground, the buried portion is buried so that the entire buried portion is located underground.

The present invention provides a secondary product foundation and a method for manufacturing the foundation that can prevent interference with buried wiring, shorten construction time, and reduce installation costs.

FIG. 2 is a top view showing the secondary product foundation of the first embodiment and an installed foundation (waterstop wall) using the same. FIG. 2 is an enlarged perspective view showing a secondary product base in part A shown in FIG. 1 . FIG. 3 is a side view showing a schematic diagram of the secondary product foundation shown in FIG. 2 installed on the ground. This is a schematic cross-sectional view showing the ground cut at the position of line F4-F4 shown in Figure 3, and is a cross-sectional view showing the state in which a secondary product foundation is installed on the ground from the front. 2 is a top view showing a process of moving the buried wiring within the hole and positioning it within the slit of the secondary product foundation in the manufacturing method of the installed foundation shown in FIG. 1 . FIG. FIG. 11 is a side view illustrating a schematic diagram of a secondary product foundation of the second embodiment and an installed foundation (piping foundation) using the secondary product foundation. This is a schematic cross-sectional view showing the ground cut at the position of line F7-F7 shown in Figure 6, and is a cross-sectional view showing the state in which a secondary product foundation has been installed on the ground from the front. FIG. 11 is a side view showing a schematic diagram of a secondary product foundation of the third embodiment and an installed foundation (waterstop wall) using the same. This is a schematic cross-sectional view showing the ground cut at the position of line F9-F9 shown in Figure 8, and is a cross-sectional view showing the state in which a secondary product foundation has been installed on the ground from the front.

The secondary product foundation of the present invention will be described below with reference to the drawings. The secondary product foundation is a reinforced concrete foundation that is formed in advance in a factory or the like to a predetermined shape, not on-site, and is a so-called precast type foundation. The secondary product foundation is used, for example, as a component part of a water cutoff wall (breakwater wall) that is installed around existing buildings and facilities as a measure against tsunamis. Alternatively, the secondary product foundation is used as a foundation for piping such as a pipeline.
[First embodiment]

The secondary product foundation 11 of the first embodiment and the installed foundation 12 using the same will be described with reference to Figures 1 to 5. The installed foundation 12 constitutes a water-stopping wall that is installed around an existing building or facility as a tsunami countermeasure. The secondary product foundation 11 is a component of the installed foundation 12 (water-stopping wall), and constitutes part of the water-stopping wall installed around the existing building 13 shown in Figure 1. As shown in Figure 2, the secondary product foundation 11 is integrally formed, for example, from reinforced concrete with an "L"-shaped cross section. The secondary product foundation 11 has a height of, for example, about 1 m to several meters, and a width of about several meters to 10 meters.

As shown in FIG. 2, the secondary product foundation 11 comprises an above-ground portion 14 provided on the ground and a buried portion 15 provided integrally with the above-ground portion 14. The above-ground portion 14 extends in a direction intersecting with the ground (up and down). The above-ground portion 14 is, for example, in the shape of a rectangular plate having a predetermined thickness.

As shown in Figures 2 and 3, the buried portion 15 extends in a direction intersecting the direction in which the above-ground portion 14 extends (a direction along the ground surface G). The buried portion 15 is, for example, in the shape of a rectangular plate having a predetermined thickness. From the standpoint of the strength of the installed foundation 12 and the prevention of collapse, it is preferable that the buried portion 15 is installed so that at least a portion of it is buried in the ground, and it is most preferable that the entire buried portion is buried in the ground.

The buried portion 15 has a first surface 15A provided on the side facing the above-ground portion 14, and a second surface 15B provided on the side opposite to the side facing the above-ground portion 14. The buried portion 15 has one or more slits 16 extending from the second surface 15B to the first surface 15A. Each of the one or more slits 16 extends in the thickness direction V of the buried portion 15, in a direction intersecting the ground G (up and down direction). The slits 16 are formed in a rectangular groove shape. The slits 16 extend, for example, elongated along the thickness direction T of the above-ground portion 14, and are provided across the entire width of the buried portion 15 in the thickness direction T of the above-ground portion 14. In this embodiment, the one or more slits 16 are, for example, three. As shown in Figures 2 and 4, the slits 16 are formed at a predetermined interval from each other. It is preferable that the one or more slits 16 are formed, for example, at a uniform pitch, which is highly versatile. The number of slits 16 is arbitrary, and can be two or, of course, four or more.

In the design of the secondary product foundation 11 of this embodiment, a structural stability check must be performed. This check includes three checks, and if all three checks are satisfied, the structural stability of the secondary product foundation 11 is ensured. The three checks are an overturning check, a sliding check, and a ground bearing capacity check.

The overturning check has a large effect on the self-weight, and the slits 16 do not pose a design problem, so conventional calculation methods can be applied as is. Furthermore, the sliding check is the area of sliding resistance against the ground, and since the area does not change even if the slits 16 are provided, conventional calculation methods can be applied as is. On the other hand, in the bearing capacity check of the ground, the slits 16 in the secondary product foundation 11 of this embodiment have an effect on the design method. For this reason, the calculation formula for the bearing capacity check of the ground is shown below. In the bearing capacity check of the ground, since the slits 16 are a deficit in relation to the installation area, it is necessary to perform the calculation according to the formula below.

Here, if the slit ratio is β,
β=n·s/D
Here, n: number of slits, s: slit width perpendicular to the applied force (m)
D: Foundation width in the direction perpendicular to the acting force (m)
As an example, when D=2 m, s=0.075 m, and n=5, the calculation is as follows:
β = 5 · 0.075/2 = 0.1875.
If the contact area ratio α is calculated by subtracting β from 1, then
α = 1 - β = 0.8125.
A calculation formula for the case where the slit 16 is provided can be obtained by multiplying D of the conventional design method by α. The calculation formula is as follows.

e: Eccentric distance from the center of the base where the resultant force acts (m)

V: Vertical force (kN)

Next, with reference to Figures 1 to 5, we will explain the manufacturing method for the installed foundation 12 using the secondary product foundation 11 of this embodiment and the function of the secondary product foundation 11.

As shown in FIG. 1, when a water-stopping wall is formed around an existing building 13 as a tsunami countermeasure, it is often unclear where the buried wiring 17 is located. Therefore, when workers excavate the planned location for installing the secondary product foundation 11 of this embodiment, they do the following. That is, as shown in FIG. 5, the workers use heavy machinery or the like to form a hole 21 in the ground so as to excavate the buried wiring 17 from the ground by a length greater than the length of the buried portion 15 in the thickness direction T of the above-ground portion 14. Therefore, the diameter of this hole 21 is greater than the length of the buried portion 15 in the thickness direction T of the above-ground portion 14.

As shown in FIG. 5, the worker holds the buried wiring 17 excavated from the ground with his hands and moves it to a position corresponding to the slit 16 of the secondary product foundation 11 as shown by the arrow. At this time, the two-dot chain line 22 indicates the original position of the buried wiring, and the curved line 23 indicates the position of the buried wiring 17 after the movement. The worker hangs the secondary product foundation 11 using, for example, heavy machinery, and installs the secondary product foundation 11 from above so that it straddles the buried wiring 17 after the movement. At that time, the secondary product foundation 11 is installed in the hole 21 while making fine adjustments so that the buried wiring 17 is located in the slit 16. Finally, as shown in FIG. 3 and FIG. 4, the soil, cement, etc. generated during the excavation are poured into the hole 21, and the soil, cement, etc. are installed on the upper side of the buried part 15. By this backfilling work, the buried part 15 is completely buried in the ground. Depending on the site conditions, at least a portion of the buried section 15 may be buried underground.

By using the same method as above, multiple secondary product foundations 11 are installed so as to completely surround the building 13 except for the entrances and exits, completing the installed foundation 12 (waterstop wall) as shown in FIG. 1. Note that FIG. 4 shows both the position of the buried wiring 17 before and after it is moved, and the arrow indicates the direction of movement of the buried wiring 17. In this way, in this embodiment, the buried part 15 is completely buried underground, so that the installed foundation 12 will not collapse even if it is subjected to a high-pressure load such as a tsunami. This makes it possible to implement strong tsunami countermeasures for the building 13 while preventing interference with the existing buried wiring 17.

According to this embodiment, the following can be said. The secondary product foundation 11 comprises an above-ground part 14 that is provided on the ground, and a buried part 15 that is provided integrally with the above-ground part 14 and extends along the ground surface G, at least a portion of which is buried in the ground, and has one or more slits 16 on the side opposite to the above-ground part 14 for passing buried wiring 17 through.

The inventors have found that the position of the buried wiring 17 buried in the ground can be manipulated to some extent by digging up the surrounding area, and that even after the position of the buried wiring 17 is manipulated to some extent, the reliability and performance of the buried wiring 17 are not affected. According to the above configuration, the buried wiring 17 is excavated from the ground, and the secondary product foundation 11 is installed by moving the buried wiring 17 slightly from its original position and passing it through the slit 16. This makes it possible to easily install the foundation. For example, when constructing a water-stopping wall for tsunami countermeasures around an existing building or constructing a foundation for piping such as a pipeline, it is possible to prevent the secondary product foundation 11 from interfering with the existing buried wiring 17. In addition, the function of the secondary product foundation 11 and the function of the buried wiring 17 are not impaired. This prevents the occurrence of large-scale additional work such as relocation and renewal work of the buried wiring 17 and design and construction of a cast-in-place concrete foundation. Alternatively, when the secondary product foundation 11 is used in construction, it is possible to prevent the additional process of cutting new slits into the secondary product foundation 11 at the site. This reduces construction costs and shortens the construction period. In addition, a foundation with more stable quality can be installed compared to cast-in-place concrete.

The above-ground portion 14 is in the form of a plate having a predetermined thickness, and one or more slits 16 extend along the thickness direction T of the above-ground portion 14. With this configuration, when installing a foundation and a water-stopping wall formed by the foundation around an existing building 13, for example, so as to cross the existing buried wiring 17, it is possible to prevent interference between the buried wiring 17 and the secondary product foundation 11.

The buried portion 15 extends in a direction intersecting the extension direction of the above-ground portion 14, and the entire buried portion 15 is buried in the ground in an installed state. With this configuration, the contact area between the buried portion 15 and the ground can be increased, making the secondary product foundation 11 less likely to collapse. This allows the secondary product foundation 11 of the present invention to be used as a strong water-stopping wall that can withstand tsunamis and high waves.

The secondary product foundation 11 is made of reinforced concrete. With this configuration, the secondary product foundation 11 can be produced at low cost and with high rigidity.

The method for manufacturing a foundation uses a secondary product foundation 11 having an above-ground part 14 in the form of a plate having a predetermined thickness, and a buried part 15 that is integral with the above-ground part 14, extends along the ground G, and has at least a portion buried in the ground, the buried part 15 having one or more slits 16 extending along the thickness direction T of the above-ground part 14 on the side opposite to the side facing the above-ground part 14, and forms a hole 21 in the ground G so as to excavate the buried wiring 17 from the ground by a length greater than the length of the buried part 15 in the thickness direction T of the above-ground part 14, deflects the buried wiring 17 within the hole 21 to the position of one or more slits 16 of the buried part 15, positions the buried wiring 17 inside one of the one or more slits 16, and installs the secondary product foundation 11 on the ground G so that at least a portion of the buried part 15 is buried in the hole 21.

According to this configuration, by moving the buried wiring 17 to the position of the slit 16 within the hole 21, interference between the secondary product foundation 11 and the existing buried wiring 17 can be prevented, and work such as relocating or updating the buried wiring 17 or designing and constructing a cast-in-place concrete foundation can be prevented. Alternatively, when the secondary product foundation 11 is used in construction, it is possible to prevent the additional process of cutting new slits into the secondary product foundation 11 on-site. This makes it possible to manufacture the installed foundation 12 extremely easily.

The buried portion 15 extends in a direction intersecting the extension direction of the above-ground portion 14, and when installed in the ground G, the buried portion 15 is buried so that the entire buried portion 15 is located underground. With this configuration, the contact area between the buried portion 15 and the ground is increased, making the secondary product foundation 11 less likely to collapse. This allows the secondary product foundation 11 of the present invention to be used as a strong water-stopping wall that can withstand tsunamis.

In the following embodiment, the differences from the first embodiment will be mainly described, and illustrations or descriptions of parts common to the first embodiment will be omitted.
[Second embodiment]

The secondary product foundation 11 of the second embodiment and the installed foundation 12 using the same will be described with reference to Figures 6 and 7. The secondary product foundation 11 of this embodiment and the installed foundation 12 using the same are used as the foundation for piping 31 such as a pipeline on the premises of a factory or facility where buried wiring 17 is present. The secondary product foundation 11 of this embodiment has a different shape for the above-ground part 14, but the other parts are the same as in the first embodiment. The secondary product foundation 11 and the installed foundation 12 using the same have a structure that is sufficiently robust to withstand the load of the piping 31 at all times and during earthquakes.

As shown in Figures 6 and 7, the above-ground part 14 directly supports a pipe 31 such as a pipeline. The above-ground part 14 extends in a direction intersecting with the ground (up and down). The above-ground part 14 is, for example, a rectangular plate having a predetermined thickness. The above-ground part 14 has a recess 32 for supporting the pipe 31. The recess 32 is in the shape of an arc that follows the outer shape of the pipe 31. The pipe 31 fits snugly into the recess 32 and is fixed to the recess 32 via an adhesive or the like.

The installed foundation 12 of this embodiment can be installed in the same manner as the first embodiment. That is, a worker forms a hole 21 in the ground, for example, using heavy machinery, so as to dig up the buried wiring 17 from the ground by a length greater than the length of the buried portion 15 in the thickness direction T of the above-ground portion 14. Therefore, the diameter of this hole 21 is greater than the length of the buried portion 15 in the thickness direction T of the above-ground portion 14.

The worker holds the buried wiring 17 excavated from the ground with his hands and moves it to a position corresponding to the slit 16 of the secondary product foundation 11 as shown by the arrow in FIG. 7. The worker hangs the secondary product foundation 11 using heavy machinery, for example, and installs the secondary product foundation 11 from above so that it straddles the buried wiring 17 after this movement. At that time, the secondary product foundation 11 is installed in the hole 21 while making fine adjustments so that the buried wiring 17 is positioned in the slit 16. Finally, as shown in FIG. 6 and FIG. 7, the soil, cement, etc. generated during the excavation are poured into the hole 21, and the soil, cement, etc. are installed on the upper side of the buried part 15. By this backfilling work, the buried part 15 is completely buried in the ground. By this process, a strong installed foundation 12 (foundation of the piping 31) is completed. The installation of the piping 31 (pipeline) is completed by installing and fixing the piping 31 in the recess 32 on the upper side of the installed foundation 12.

According to this embodiment, it is possible to prevent interference with existing buried wiring 17 within the premises of a factory or facility and to install a quality-stable installed foundation 12 (piping foundation) in a short construction period.
[Third embodiment]

With reference to Figures 8 and 9, a secondary product foundation 11 according to the third embodiment and an installed foundation 12 using the same will be described. The installed foundation 12 is a water-stopping wall that is installed around an existing building or facility as a measure against tsunamis. The secondary product foundation 11 is a component of the water-stopping wall, and forms part of the water-stopping wall installed around the existing building 13 shown in Figure 1. In this embodiment, the shape of the secondary product foundation 11 differs from that of the first embodiment. The secondary product foundation 11 has a height of, for example, about 1m to several meters, and a width of about several meters to 10 meters.

The secondary product foundation 11 has an inverted "T" shape. That is, the above-ground part 14 extends from the middle position of the buried part 15 in the thickness direction T of the above-ground part 14 in a direction intersecting with the buried part 15. The detailed shapes of the above-ground part 14 and the buried part 15 are the same as those of the first embodiment.

The installed foundation 12 using the secondary product foundation 11 of this embodiment can be manufactured by the same manufacturing method as in the first embodiment. According to this embodiment, a strong, quality-stable installed foundation 12 (waterstop wall) can be installed in a short construction period around an existing building 13, etc., while preventing interference with existing buried wiring 17.

The above-described embodiment can be implemented with various substitutions and modifications. Naturally, different embodiments can also be appropriately combined to form a single invention.

11 Secondary product foundation 12 Installed foundation 14 Above-ground part 15 Buried part 15A First surface 15B Second surface 16 Slit 17 Buried wiring 21 Hole G Ground

Claims (5)

An above-ground part provided on the ground;
a buried portion that is provided integrally with the above-ground portion and extends along the ground, at least a portion of which is buried in the ground, and has a plurality of slits for passing buried wiring on the side opposite to the side facing the above-ground portion;
Equipped with
The above-ground part is in the form of a plate having a predetermined thickness,
The plurality of slits form a secondary product foundation extending along the thickness direction of the above-ground portion . The secondary product foundation according to claim 1 , wherein the buried portion extends in a direction intersecting the direction in which the above-ground portion extends, and all of the buried portion is buried in the ground when installed. 3. The secondary product foundation according to claim 1 or 2, which is made of reinforced concrete. A method for manufacturing a foundation using a secondary product foundation having an above-ground portion in the form of a plate having a predetermined thickness, and a buried portion which is integral with the above-ground portion, extends along the ground, and has at least one slit extending along the thickness direction of the above-ground portion on a side opposite to the side facing the above-ground portion,
forming a hole in the ground so as to excavate the buried wiring from the ground by a length greater than the length of the buried portion in the thickness direction of the above-ground portion;
The buried wiring is deflected to any one of the one or more slits of the buried portion within the hole portion;
A method for manufacturing a foundation, comprising positioning the buried wiring inside any one of the one or more slits and installing the secondary product foundation on the ground so that at least a portion of the buried portion is buried within the hole portion. The buried portion extends in a direction intersecting a direction in which the above-ground portion extends,
The method for manufacturing a foundation according to claim 4 , wherein the buried portion is buried so that the entire buried portion is located underground when the foundation is installed on the ground.

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