JP2023008419A - Secondary product foundation, and foundation manufacturing method - Google Patents

Abstract

To provide a secondary product foundation and a foundation manufacturing method which prevent an interference with buried wiring, and can shorten a construction period and reduce installation cost.SOLUTION: A secondary product foundation 11 includes: a ground part 14 which is provided on the ground; and an embedded part 15 which is provided integrally with the ground part 14, extends along a ground surface G, is at least partially embedded in the ground, and has one or more slits 16 for passing embedded wiring 17 to a side opposite to a side facing the ground part 14.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a secondary product foundation that is installed with at least a portion buried in the ground, and a method for manufacturing the foundation.

A foundation block for installing a fence and a fence provided with the same are disclosed (see Patent Document 1). A fence consists of a fence foundation part and a fence part. The fence foundation has a block connecting body in which foundation blocks are connected, and weight blocks detachably mounted on the foundation blocks. This fence is placed and fixed on the ground by means of weight blocks without burying the foundation blocks in the ground.

JP-A-2021-8773

By the way, when installing a buried type protective wall or various foundations around an existing facility using a concrete secondary product foundation, cables (buried wiring) that are buried in the ground of the protective wall or foundation There is a problem that it interferes with etc. For this reason, if there is such a buried wiring, it is possible to take measures such as relocating the buried wiring or the like by re-laying the buried wiring, or changing to a cast-in-place concrete foundation. However, moving buried wiring and the like is time consuming and costly. Also, when changing to a cast-in-place concrete foundation, not only does it take time to cure the concrete, but additional design and manufacturing costs are incurred, increasing the cost required for installation.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a secondary product foundation and a manufacturing method of the foundation that can prevent interference with buried wiring, shorten the construction period, and reduce the installation cost.

The above problems are solved by the present invention described below.
That is, the secondary product foundation of the present invention (1) includes a ground part provided on the ground,
An embedded section provided integrally with the above-ground section and extending along the ground, at least a portion of which is embedded in the ground, and for passing buried wiring on the side opposite to the side facing the above-ground section a buried portion having one or more slits of
Prepare.

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

Further, the secondary product foundation of the present invention (3) is the secondary product foundation according to (1) or (2), wherein the embedded portion extends in a direction intersecting with the direction in which the aboveground portion extends. , all of the buried portions are buried in the ground in an installed state.

Further, the secondary product foundation of the present invention (4) is the secondary product foundation according to any one of (1) to (3), and is made of reinforced concrete.

In addition, the method for manufacturing a foundation according to the present invention (5) comprises a plate-shaped ground portion having a predetermined thickness, and a plate-shaped ground portion provided integrally with the ground portion, extending along the ground and having at least a portion thereof formed on the ground. a secondary product foundation having an embedded portion embedded therein, the embedded 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 A method for manufacturing an installed foundation using
forming a hole in the ground so as to excavate the buried wiring from the ground for a length larger than the length of the buried portion in the thickness direction of the ground portion;
deflecting the embedded wiring to any position of the one or more slits of the embedded portion within the hole;
The secondary product foundation is placed on the ground such that the embedded wiring is positioned inside any one of the one or more slits and at least part of the embedded portion is embedded in the hole.

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

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the secondary product foundation and foundation which can prevent interference with an embedded wiring, can shorten a construction period, and can reduce an installation cost can be provided.

It is a top view which shows the secondary product foundation of 1st Embodiment, and the installed foundation (cutoff wall) using the same. It is a perspective view which expands and shows the secondary product base in the A section shown in FIG. It is a side view which shows typically the state in which the secondary product foundation shown in FIG. 2 was installed with respect to the ground. FIG. 4 is a schematic cross-sectional view showing the ground cut along line F4-F4 shown in FIG. 3, and is a cross-sectional view showing from the front a state in which the secondary product foundation is installed with respect to the ground. FIG. 3 is a top view schematically showing a step of moving the buried wiring in the hole and positioning it in the slit of the secondary product foundation in the method of manufacturing the installed foundation shown in FIG. 1 ; It is a side view which shows typically the secondary product foundation of 2nd Embodiment, and the installed foundation (pipe foundation) using the same. FIG. 7 is a schematic cross-sectional view showing the ground cut along line F7-F7 shown in FIG. 6, and is a cross-sectional view showing from the front a state in which the secondary product foundation is installed with respect to the ground. It is a side view which shows typically the secondary product foundation of 3rd Embodiment, and the installed foundation (cutoff wall) using the same. FIG. 9 is a schematic cross-sectional view showing the ground cut at the position of line F9-F9 shown in FIG. 8, and is a cross-sectional view showing a state in which the secondary product foundation is installed on the ground from the front.

The secondary product basis 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 predetermined shape at a factory or the like rather than at the site, and is a so-called precast type foundation. Secondary product foundations are used, for example, as constituent parts of cutoff walls (breakwater walls) installed around existing buildings and facilities for tsunami countermeasures. Alternatively, secondary product foundations are utilized as foundations for piping such as pipelines.
[First embodiment]

A secondary product foundation 11 of the first embodiment and an installed foundation 12 using the same will be described with reference to FIGS. 1 to 5. FIG. The installed foundation 12 constitutes a cutoff wall installed around existing buildings and facilities for tsunami countermeasures. The secondary product foundation 11 is a constituent part of the installed foundation 12 (water stop wall), and constitutes a part of the water stop wall installed around the existing building 13 shown in FIG. As shown in FIG. 2, the secondary product foundation 11 is integrally formed of, for example, reinforced concrete with an "L"-shaped cross section. The secondary product base 11 is, for example, about 1 m to several meters high and about several meters to 10 meters wide.

As shown in FIG. 2 , the secondary product foundation 11 includes an aboveground portion 14 provided on the ground and an embedded portion 15 provided integrally with the aboveground portion 14 . The ground portion 14 extends in a direction intersecting the ground (vertical direction). The ground portion 14 has, for example, a square plate shape with a predetermined thickness.

As shown in FIGS. 2 and 3, the buried portion 15 extends in a direction (along the ground G) intersecting with the direction in which the ground portion 14 extends. The embedded portion 15 has, for example, a rectangular plate shape with a predetermined thickness. From the viewpoint of the strength of the installed foundation 12 and prevention of collapse, the embedded part 15 is preferably installed so that at least a part of it is buried in the ground, and it is installed so that the whole part is buried in the ground. is most preferred.

The buried portion 15 has a first surface 15A provided on the side facing the ground portion 14 and a second surface 15B provided on the side opposite to the side facing the ground portion 14 . Embedded portion 15 has one or more slits 16 extending from second surface 15B toward first surface 15A. Each of the one or more slits 16 extends in the thickness direction V of the embedded portion 15 and in a direction crossing the ground G (vertical direction). The slit 16 is formed in the shape of a square groove. The slit 16 , for example, elongates along the thickness direction T of the ground portion 14 and is provided over the entire width of the embedded portion 15 in the thickness direction T of the ground portion 14 . One or more slits 16 are, for example, three in this embodiment. As shown in FIGS. 2 and 4, the slits 16 are formed at predetermined intervals. One or more slits 16 are preferably formed at a uniform pitch, for example, because of high versatility. The number of slits 16 is arbitrary, and may be two, or four or more.

In designing the secondary product foundation 11 of this embodiment, it is necessary to check the structural stability. This verification includes three verifications, and the structural stability of the secondary product foundation 11 is ensured when all three verifications are satisfied. The three checks are a tipping check, a sliding check, and a soil bearing capacity check.

Since tipping inspection has a large effect on its own weight and the slit 16 poses no problem in terms of design, the conventional calculation method can be applied as it is. Further, the sliding check is the area of the sliding resistance against the ground, and since the area does not change even if the slit 16 is provided, the conventional calculation method can be applied as it is. On the other hand, in checking the bearing capacity of the ground, the slit 16 of the secondary product foundation 11 of this embodiment affects the design method. Therefore, the calculation formula for checking the bearing capacity of the ground is shown below. In checking the bearing capacity of the ground, since the slit 16 becomes a defect with respect to the installation area, it is necessary to calculate as in the following formula.

Here, if the slit ratio is β, then
β=ns/D
Here, n: Number of slits s: Slit width in right angle direction of acting force (m)
D: Foundation width in the direction perpendicular to the acting force (m)
As an example, if D = 2 m, s = 0.075 m, and n = 5, then
β=5·0.075/2=0.1875.
If the value obtained by subtracting β from 1 is the contact area ratio α,
α=1−β=0.8125.
By multiplying D in the conventional design method by α, a calculation formula for providing the slit 16 can be obtained. The calculation formula is as follows.

ｅ：合力作用位置の基礎中心からの偏心距離（ｍ）

e: Eccentric distance (m) from the base center of the resultant force acting position

Ｖ：鉛直力（ｋＮ）

V: vertical force (kN)

Next, a method for manufacturing the installed foundation 12 using the secondary product foundation 11 of the present embodiment and the operation of the secondary product foundation 11 will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIG. 1, when a water cutoff wall is formed around an existing building 13 as a countermeasure against tsunami, it is often unclear where the buried wiring 17 exists. Therefore, when excavating a planned location for installing the secondary product foundation 11 of the present embodiment, the worker does the following. That is, as shown in FIG. 5, an operator digs up the buried wiring 17 from the ground by a length larger than the length of the buried portion 15 in the thickness direction T of the ground portion 14, and digs it up into the ground with a heavy machine or the like. A hole 21 is formed. Therefore, the diameter of this hole portion 21 is larger than the length of the embedded portion 15 in the thickness direction T of the ground portion 14 .

As shown in FIG. 5, the operator holds the buried wiring 17 dug up from the ground by hand and moves it to a position corresponding to the slit 16 of the secondary product foundation 11 as indicated by the arrow. . At this time, a two-dot chain line 22 indicates the original position of the buried wiring, and a curved line 23 indicates the position of the buried wiring 17 after movement. The worker suspends the secondary product foundation 11 using, for example, a heavy machine or the like, and installs the secondary product foundation 11 from above so as to straddle the buried wiring 17 after this movement. At that time, the secondary product base 11 is installed in the hole 21 while making fine adjustments so that the embedded wiring 17 is positioned in the slit 16 . Finally, as shown in FIGS. 3 and 4, the earth, sand, cement, and the like generated during excavation are put into the hole 21 to set the earth, sand, cement, and the like on the upper side of the buried portion 15 . By this backfilling work, the buried portion 15 is completely buried in the ground. Depending on the site conditions, at least part of the buried portion 15 may be buried in the ground.

By the same method as above, a plurality of secondary product foundations 11 are installed so as to surround the perimeter of the building 13 without any gaps except for the entrance, so that as shown in FIG. ) is completed. 4 schematically shows both the position of the buried wiring 17 before movement and the position of the buried wiring 17 after movement, and the arrow indicates the moving direction of the buried wiring 17. As shown in FIG. Thus, in this embodiment, since the buried portion 15 is completely buried in the ground, even if a high pressure load such as a tsunami is applied, the installed foundation 12 will not collapse. As a result, interference with the existing buried wiring 17 can be prevented, and strong tsunami countermeasures can be taken for the building 13 .

According to this embodiment, the following can be said. The secondary product foundation 11 includes a ground portion 14 provided on the ground, and an embedded portion 15 provided integrally with the ground portion 14 and extending along the ground G, at least a portion of which is embedded in the ground. , and an embedded portion 15 having one or more slits 16 for passing an embedded wiring 17 on the side opposite to the side facing the ground portion 14 .

The inventors found that the position of the buried wiring 17 buried in the ground can be manipulated to some extent by digging up the surroundings thereof, and that the position of the buried wiring 17 can be manipulated to some extent. , does not affect the reliability or performance of the buried wiring 17 . According to the above configuration, the buried wiring 17 is dug up from the ground, the buried wiring 17 is slightly moved from its original position, and the secondary product foundation 11 is installed so as to pass through the slit 16, thereby performing the foundation installation work. can be done easily. For example, when constructing a water stop wall for tsunami countermeasures around an existing building or constructing a foundation for piping such as a pipeline, the secondary product foundation 11 interferes with the existing buried wiring 17. You can prevent it from slipping. Also, the function of the secondary product base 11 and the function of the buried wiring 17 are not impaired. As a result, it is possible to prevent large-scale additional work such as relocation/renewal work of the buried wiring 17 and design/construction of the cast-in-place concrete foundation. Alternatively, when the secondary product foundation 11 is used for construction, it is possible to prevent an additional step of newly slitting the secondary product foundation 11 on site. As a result, the construction cost can be reduced and the construction period can be shortened. In addition, compared to cast-in-place concrete, a foundation with stable quality can be installed.

The ground portion 14 has a plate shape with a predetermined thickness, and one or more slits 16 extend along the thickness direction T of the ground portion 14 . According to this configuration, for example, when installing a foundation and a cutoff wall formed by the foundation around the existing building 13 so as to traverse the existing buried wiring 17, the buried wiring 17 and the secondary product foundation are installed. 11 can be prevented from interfering with each other.

The buried portion 15 extends in a direction intersecting with the direction in which the ground portion 14 extends, and the entire buried portion 15 is buried in the ground in an installed state. According to this configuration, it is possible to increase the contact area between the buried portion 15 and the ground, and to provide a structure in which the secondary product foundation 11 does not easily collapse. As a result, the secondary product foundation 11 of the present invention can be utilized as a strong cutoff wall that can withstand tsunamis and high waves.

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

The method of manufacturing the foundation includes a plate-shaped ground portion 14 having a predetermined thickness, and an underground portion integrally provided with the ground portion 14 and extending along the ground G and at least partially buried in the ground. A secondary product foundation 11 having an embedded portion 15 having one or more slits 16 extending along the thickness direction T of the above ground portion 14 on the side opposite to the side facing the above ground portion 14 In the manufacturing method of the foundation used, a hole 21 is formed in the ground G so as to excavate the buried wiring 17 by a length larger than the length of the buried portion 15 in the thickness direction T of the ground portion 14, The embedded wiring 17 is deflected to any position of one or more slits 16 of the embedded portion 15 within the hole 21 , the embedded wiring 17 is positioned inside any one of the one or more slits 16 , and the embedded wiring 17 is positioned inside the hole 21 . The secondary product foundation 11 is installed on the ground G so that at least part of the buried part 15 is buried.

According to this configuration, by moving the buried wiring 17 to the position of the slit 16 in the hole 21, interference between the secondary product foundation 11 and the existing buried wiring 17 is prevented, and the buried wiring 17 is relocated/relocated. It is possible to prevent work such as updating and work such as design and construction of cast-in-place concrete foundations. Alternatively, when the secondary product foundation 11 is used for construction, it is possible to prevent an additional step of newly slitting the secondary product foundation 11 on site. This allows the installed foundation 12 to be manufactured very simply.

The buried portion 15 extends in a direction intersecting the direction in which the ground portion 14 extends, and when installed on the ground G, the buried portion 15 is buried so that the entire buried portion 15 is positioned in the ground. According to this configuration, it is possible to increase the contact area between the buried portion 15 and the ground, and to provide a structure in which the secondary product foundation 11 does not easily collapse. As a result, the secondary product foundation 11 of the present invention can be utilized as a strong cutoff wall that can withstand tsunamis.

In the following embodiment, portions different from the first embodiment will be mainly described, and illustration or description of portions common to the first embodiment will be omitted.
[Second embodiment]

A secondary product foundation 11 of the second embodiment and an installed foundation 12 using the same will be described with reference to FIGS. 6 and 7 . The secondary product foundation 11 and the installed foundation 12 using the secondary product foundation 11 of the present embodiment are used as foundations for pipes 31 such as pipelines in the premises of factories and facilities where buried wiring 17 exists. The secondary product foundation 11 of this embodiment differs in the shape of the ground part 14, but the other parts are common to those of the first embodiment. The secondary product foundation 11 and the installed foundation 12 using it have a sufficiently robust structure to withstand the loads of the pipes 31 at all times and during earthquakes.

As shown in FIGS. 6 and 7, the ground portion 14 directly supports a pipe 31 such as a pipeline. The ground portion 14 extends in a direction intersecting the ground (vertical direction). The ground portion 14 has, for example, a square plate shape with a predetermined thickness. Aboveground portion 14 has recess 32 for supporting pipe 31 . The recessed portion 32 has an arcuate shape along the outer shape of the pipe 31 . The pipe 31 is tightly fitted in the recess 32 and fixed to the recess 32 with an adhesive or the like.

The installed foundation 12 of the present embodiment can be installed by a method similar to that of the first embodiment. That is, the operator digs up the buried wiring 17 from the ground by a length larger than the length of the buried portion 15 in the thickness direction T of the ground portion 14, and forms a hole portion 21 in the ground by, for example, a heavy machine. . Therefore, the diameter of this hole portion 21 is larger than the length of the embedded portion 15 in the thickness direction T of the ground portion 14 .

A worker holds the buried wiring 17 dug up from the ground by hand and moves it to a position corresponding to the slit 16 of the secondary product foundation 11 as indicated by the arrow in FIG. The worker suspends the secondary product foundation 11 using, for example, a heavy machine or the like, and installs the secondary product foundation 11 from above so as to straddle the buried wiring 17 after this movement. At that time, the secondary product base 11 is installed in the hole 21 while making fine adjustments so that the embedded wiring 17 is positioned in the slit 16 . Finally, as shown in FIGS. 6 and 7, the earth, sand, cement, etc. generated during excavation are put into the hole 21 to set the earth, sand, cement, etc. on the upper side of the buried portion 15 . By this backfilling work, the buried portion 15 is completely buried in the ground. Through such steps, a strong installed foundation 12 (the foundation of the pipe 31) is completed. Installation of the pipe 31 (pipeline) is completed by installing and fixing the pipe 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 the existing buried wiring 17 and install the installed foundation 12 (pipe foundation) with stable quality in a short construction period within the premises of a factory or facility.
[Third Embodiment]

A secondary product foundation 11 of the third embodiment and an installed foundation 12 using the same will be described with reference to FIGS. 8 and 9 . The installed foundation 12 is a cutoff wall installed around existing buildings and facilities for tsunami countermeasures. The secondary product foundation 11 is a constituent part of the water cutoff wall, and constitutes a part of the water cutoff wall installed around the existing building 13 shown in FIG. In this embodiment, the form of the secondary product base 11 is different from that in the first embodiment. The secondary product base 11 is, for example, about 1 m to several meters high and about several meters to 10 meters wide.

The secondary product foundation 11 has an inverted "T" shape. That is, the ground portion 14 extends in a direction intersecting the embedded portion 15 from an intermediate position of the embedded portion 15 with respect to the thickness direction T of the ground portion 14 . Detailed shapes of the ground portion 14 and the embedded portion 15 are the same as in the first embodiment.

The installed foundation 12 using the secondary product foundation 11 of the present embodiment can be manufactured by the same manufacturing method as in the first embodiment. According to this embodiment, the installed foundation 12 (water stop wall) that is strong and stable in quality is installed around the existing building 13 or the like in a short construction period by preventing interference with the existing buried wiring 17. can do.

The above-described embodiments can be implemented with various replacements and modifications. Also, it is naturally possible to configure one invention by appropriately combining different embodiments.

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

Claims (6)

a ground part provided on the ground;
An embedded section provided integrally with the above-ground section and extending along the ground, at least a portion of which is embedded in the ground, and for passing buried wiring on the side opposite to the side facing the above-ground section a buried portion having one or more slits of
Secondary product basis with. The ground portion has a plate shape with a predetermined thickness,
The secondary product foundation according to claim 1, wherein the one or more slits extend along the thickness direction of the aboveground portion. 3. The secondary according to claim 1 or 2, wherein the buried portion extends in a direction intersecting with the direction in which the ground portion extends, and all of the buried portion is buried in the ground in an installed state. product basis. The secondary product foundation according to any one of claims 1 to 3, which is made of reinforced concrete. a plate-shaped above-ground portion having a predetermined thickness; and a buried portion having one or more slits extending along the thickness direction of the 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 for a length larger than the length of the buried portion in the thickness direction of the ground portion;
deflecting the embedded wiring to any position of the one or more slits of the embedded portion within the hole;
A foundation for placing the secondary product foundation on the ground so that the buried wiring is positioned inside any one of the one or more slits and at least part of the buried portion is buried in the hole. manufacturing method. the embedded portion extends in a direction intersecting with the direction in which the ground portion extends,
6. The method of manufacturing a foundation according to claim 5, wherein the buried portion is buried so that the entire buried portion is positioned in the ground when the foundation is installed on the ground.

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