JP6438722B2 - Construction method of foundation structure - Google Patents

Description

The present invention includes a first portion supported on the ground, the second and part to a method for construction of Concrete foundation structure having a that has Watarura between each other said first portion.

As a concrete foundation structure, a structure in which a second part such as a structural slab is spanned between first parts such as a foundation beam (underground beam) supported by the ground (for example, (See Patent Documents 1 and 2.)
In such a conventional foundation structure, a structural slab, etc., is made by placing concrete directly or appropriately through a discarded formwork on the ground after leveling, where crushed stone is laid or leveled concrete is placed. Is created. That is, the structural slab and the like thus constructed are in contact with the ground side directly or through a discarded formwork or the like.

JP 2007-262854 A JP 05-247947 A

In the basic structure as described above, when the structural slab or the like is in contact with the ground side, vibration of the structural slab or the like is easily transmitted directly to the ground side through the contact portion.
Especially in buildings where various performances such as rock concerts are performed on a relatively wide structure slab, such as a multipurpose hall, the so-called “tateori” phenomenon in which the audience shakes their heads and jumps to the music. A structural slab or the like may vibrate relatively greatly. And if the big vibration is directly transmitted to the ground side through the contact portion, there is a concern about the influence on the neighboring residents due to the vibration.

In view of this situation, the main object of the present invention includes a first portion supported on the ground, Concrete foundation structure construction having a second portion which has Watarura, a between each other said first portion In the method, the present invention is to provide a technique capable of preventing the direct vibration from the second part to the ground side and avoiding the influence of the vibration on the neighboring residents.

The basic structure of this foundation structure is a concrete foundation structure comprising a first part supported by the ground, and a second part spanned between the first parts,
It exists in the point comprised by the said 2nd site | part in the non-contact state floated with respect to the ground side.

According to the basic structure having this characteristic configuration, the second part such as the structural slab is configured in a non-contact state floated with respect to the ground side. In other words, a so-called edged state in which a cavity is interposed is provided, and the vibration of the second part is not directly transmitted to the ground.
Therefore, according to the present invention, it is possible to provide a foundation structure that can prevent direct vibration transmission from the second part to the ground side and avoid the influence of the vibration on neighboring residents.

A first characteristic configuration of the present invention is a method for constructing a concrete foundation structure including a first part supported by the ground and a second part spanned between the first parts. ,
Upon that concrete is a forming space of the second portion, the支保Engineering provided between the ground side, thereby constituting a more removable foam resin dissolve, open in a direction toward to the shoring A supply pipe having an injection hole drilled in a side wall is disposed on the side of the support work between the ground side and
After expressing the strength of the concrete cast in the formation space of the second part, the solvent is dissolved from the injection hole provided in the side wall of the supply pipe by pumping a solvent that dissolves the foamed resin into the supply pipe. the was injected into the shoring lies in the removal by construed dissolve the支保Engineering.

  According to the construction method of the foundation structure having this characteristic configuration, a supporting work made of a predetermined material provided between the formation space of the second part such as the structural slab and the ground side is placed in the formation space. In a non-contact state where the second part is floated with respect to the ground side or a contact area with respect to the ground is reduced by a rational and simple method such as dissolution or biodegradation after the concrete has developed its strength. It can comprise and a cavity can be formed over the whole between the said 2nd site | part and the ground side.

That is, since the second part configured in this way is in a state of being edge-cut with the cavity interposed between the entire ground side, for example, when the second part vibrates greatly. However, the vibration can be suitably prevented from being directly transmitted to the ground.
Therefore, according to the present invention, it is possible to provide a construction method for a foundation structure that can prevent direct vibration transmission from the second part to the ground side and avoid the influence of the vibration on neighboring residents. .

  In addition, this foundation construction method minimizes the amount of excavation of the ground, since it is not necessary for an operator to sink into the space between the second part after placing the concrete and the ground side in order to remove the support work. For example, the cost can be reduced and the number of construction steps can be reduced.

According to the construction method of the foundation structure having this characteristic configuration, when the support provided between the formation space of the second part and the ground side is made of a foamed resin that can be dissolved by contacting the solvent, the solvent Since the supply pipe for supplying the support to the support is arranged in advance, after the strength of the concrete placed in the formation space of the second part is developed, the solvent is simply supplied to the support using the supply pipe. The supporting work can be dissolved and removed.
As for the 2nd characteristic composition of the present invention, the above-mentioned support work is constituted by a foam resin square material, and a plurality of the support works are arranged on the ground in a posture in which the longitudinal direction is parallel,
The supply pipe is configured by forming a plurality of the injection holes at predetermined intervals.

In the construction method of the foundation structure of this embodiment, the elevation sectional view which shows the state before concrete placement with respect to the formation space of the 2nd part In the construction method of the foundation structure of this embodiment, the elevation sectional view which shows the state after concrete placement with respect to the formation space of the 2nd part The enlarged view which shows the state in the middle of the melting | dissolving of a support work in the construction method of the foundation structure of this embodiment Elevated sectional view showing a schematic configuration of the foundation structure constructed in the construction method of the present embodiment

A basic structure and its construction method as an embodiment of the present invention will be described with reference to the drawings.
First, the structure of the foundation structure will be described with reference to FIG.
The foundation structure of the present embodiment includes a foundation beam 10 (an example of a first part) supported on the ground 1 side, and a structural slab 15 (an example of a second part) spanned between the foundation beams 10. It is constructed as a concrete foundation structure with Further, although not shown in the figure, a plurality of independent footings are arranged at the four corners of the building, and the foundation beam 10 is constructed in a state extending between the plurality of footings. The building load is transmitted to the ground 1 through the foundation beam 10 and the footing.

  Here, the foundation beam 10 indicates an underground beam embedded in the ground in a so-called cloth foundation, and the structural slab 15 indicates a lowermost slab constructed in a state of being placed on the upper surface of the foundation beam 10. Show. Furthermore, although illustration is omitted, the reinforcing bar of the structural slab 15 is connected to the reinforcing bar 7 protruding above the foundation beam 10, whereby the structural slab 15 is connected to and supported by the foundation beam 10. It becomes a state.

  The structural slab 15 is configured in a non-contact state floating with respect to the ground 1 side in order to prevent direct vibration transmission from the structural slab 15 to the ground 1 side. That is, between the structural slab 15 and the ground 1 side, a cavity 40 is formed that does not have a contact portion that contacts them directly or via a formwork or the like. Then, the structural slab 15 is in a so-called edge-cut state in which the cavity 40 is interposed in the whole with respect to the ground 1 side, and the vibration of the structural slab 15 is not directly transmitted to the ground 1.

For example, when such a basic structure is applied to a basic structure of a building where various performances such as rock concerts are performed on a relatively wide structural slab 15 such as a multipurpose hall, the audience can adjust to the music. The structural slab 15 may vibrate relatively greatly due to a so-called “tateori” phenomenon in which the head is swung vertically or jumped.
However, even when the structural slab 15 vibrates greatly as described above, the structural slab 15 is in a state where the cavity 40 is interposed between the ground 1 and the ground 1 so that the large vibration is generated in the ground 1. As a result, the influence of the vibration on neighboring residents is avoided.

  Next, a construction method for constructing such a basic structure will be described with reference to FIGS. In addition, FIGS. 1-4 shows the state change of the root cutting part of a foundation structure in order in the construction method of a foundation structure.

Various methods known in the art can be adopted for the root cutting in the site and the footing construction method, and the detailed description thereof is omitted.
Also, as a method for constructing the foundation beam 10, various known construction methods can be employed. For example, the foundation beam 10 can be constructed as follows.
That is, as shown in FIG. 1, a concrete panel 4 called a spun cleat as a bottom mold is formed on the ground 1 that has been leveled by root cutting, laying crushed stone 2, and placing leveling concrete 3. A footing supported by the ground 1 is laid in a state where both ends are erected, and a discarded form 5 is erected thereon. And the foundation beam 10 is constructed | assembled by placing concrete appropriately in the space formed by the concrete panel 4 and the inside of the discard mold 5 and placing concrete.
The ground 1 below the concrete panel 4 is excavated in advance, and a space is formed between the lower surface of the concrete panel 4 and the ground 1 side. Thereby, also about the foundation beam 10, it will be comprised in the non-contact state floated with respect to the ground side, and it becomes difficult to transmit the vibration of the foundation beam 10 directly to the ground.

After the foundation beam 10 is constructed, the structural slab 15 is constructed. The procedure will be described below.
First, as shown in FIG. 1, a support 20 is appropriately disposed on the ground 1 that has been leveled by laying crushed stones 2 and placing leveling concrete 3.
Here, the support work 20 is made of a material that can be removed by dissolution, and specifically, a square member made of foamed resin such as polystyrene foam, polyurethane foam, or polyethylene foam is used.

The support 20 made of foamed resin squares is arranged on the ground 1 in a posture in which the longitudinal direction is parallel to the foundation beam 10 between the foundation beams 10 arranged on both sides.
Furthermore, a supply pipe 30 for supplying a solvent A (see FIG. 3) described later to the support work 20 is disposed on the side of the support work 20. As the supply pipe 30, a normal flexible hose, a pipe made of vinyl chloride resin, or the like can be used, and an injection hole 30 a that opens in a direction toward the support work 20 is provided on the side wall of the supply pipe 30. A plurality of holes are formed at intervals.

  After the support work 20 and the supply pipe 30 are arranged on the ground 1 side, the deck plate 11 is placed on the support work 20 after placing a presser plate 21 for ensuring stability. Although illustration is omitted, slab bars are arranged in the formation space of the structural slab 15 formed on the deck plate 11.

  Since both ends of the deck plate 11 are installed on the upper surface of the foundation beam 10 or the discarding form 5 thereof, when the deck plate 11 is narrow and bending does not become a problem, the support 20 Can be omitted. However, in this embodiment, since the deck plate 11 is relatively wide, the lower surface of the deck plate 11 is supported by the supporter 20.

After placing the deck plate 11 on the support 20, concrete is placed in the formation space of the structural slab 15 formed on the upper portion of the deck plate 11. Then, as shown in FIG. 2, the structural slab 15 is constructed in a posture extending between the foundation beams 10.
At this stage, the structural slab 15 is in contact with the ground 1 side via the support 20 or the like.

  Further, as shown in FIG. 3, after the strength of the concrete placed in the formation space of the structural slab 15 is expressed, the support 20 is dissolved and removed, and the structural slab 15 is lifted from the ground 1 side. Keep in contact.

That is, the foamed resin constituting the support 20 is a predetermined solvent A, specifically, an organic solvent such as benzene, toluene, acetone, xylene, an aromatic oil component limonene (d-limonene) that can be taken from citrus peel, and the like. It can be said that it is a material that can be dissolved and removed by contacting with a solvent.
Then, a pump 32 is connected to the connection portion 31 provided on the proximal end side of the supply pipe 30, and the solvent A is pumped to the supply pipe 30 by the pump 32, whereby the injection hole 30 a provided in the side wall of the supply pipe 30. Thus, the solvent A is sprayed toward the support 20.

Then, as shown in FIG. 3, the support work 20 made of the foamed resin is gradually dissolved by the contact of the solvent A, and as a result, the support work 20 is completely removed as shown in FIG. .
Since the supply pipe 30 is not required after the support work 20 is removed, for example, the exposed portion of the supply pipe 30 is removed as appropriate, and a fall prevention measure such as a backing plate or stuffed rubber is applied. It is desirable to embed and hide with mortar.

  By the construction method as described above, the structural slab 15 is configured in a non-contact state in which the structural slab 15 is floated with respect to the ground 1 side, and directly between the structural slab 15 and the ground 1 side or directly via a formwork or the like. Thus, it is possible to form the cavity 40 in which there is no contact portion for contacting them. Therefore, as described above, the vibration of the structural slab 15 can be prevented from being directly transmitted to the ground 1 and the influence of the vibration on neighboring residents can be avoided.

  Moreover, in this foundation construction method, since it is not necessary for an operator to sink into the space between the structure slab 15 after the concrete placement and the ground 1 side in order to remove the support 20, The space height of the lower surface (the lower surface of the deck plate 11) on the structural slab 15 side with respect to the upper surface is set to be relatively low. Thereby, the amount of excavation of the ground 1 is reduced, and cost reduction and construction man-hours are reduced.

  In this embodiment, a foamed resin is used as the support work 20 and a space is formed between the structural slab 15 and the ground 1 side by dissolving and removing the foamed resin. The space formation technique can be suitably used for the formation of temporary joints for soil slabs and the formation of seismic slits on the outer walls of buildings.

[Another embodiment]
(1) In the basic structure of the above embodiment, the structural slab 15 is defined as a first part supported by the ground as the first part and the second part in which the structural slab 15 extends between the first parts. Although it comprised in the non-contact state floated with respect to the ground 1 side, you may set another site | part as a 1st site | part and a 2nd site | part.
For example, in a non-contact state where the footings placed at the four corners of the building are the first part and the foundation beam spanned between the footings is the second part, the foundation beam is floated with respect to the ground side. In a pressure-resistant board foundation (solid foundation), a part of the bottom board part is used as the first part, the other part of the bottom board part is used as the second part, and the other part of the bottom board part is floated with respect to the ground side. You may comprise in a contact state.

(2) In the foundation structure of the above embodiment, as a construction method of the foundation structure for constructing the structure slab 15 as the second part in a non-contact state in which the structure slab 15 is floated with respect to the ground 1 side, the structural slab 15 and the ground 1 side Although the construction method which dissolves and removes after the strength expression of the concrete cast | placed in the formation space of the structure slab 15 was employ | adopted for the support work 20 provided between these, another construction method may be employ | adopted. For example, by laying the bottom mold frame of the second part composed of concrete panels or the like in a state where both ends are erected on the pair of first parts, and excavating the ground below the bottom mold frame in advance The second part can be brought into a non-contact state where the second part is floated with respect to the ground side.

(3) In the construction method of the basic structure of the above embodiment, the supporting work 20 is made of a foamed resin that can be dissolved and removed by the predetermined solvent A, but a material that can be removed by biodegradation may be used. Examples of materials that can be removed by biodegradation include microbial production systems such as poly-3-hydroxybutyric acid and polyhydroxyalkanoates, chemical synthesis systems such as polylactic acid and polyvinyl alcohol, natural substances such as esterified starch and cellulose acetate. Various biodegradable materials such as systems can be used.

1 Ground 10 Foundation beam (first part)
15 Structure slab (second part)
20 Support 30 Supply pipe A Solvent

Claims (2)

A construction method for a concrete foundation structure comprising a first part supported on the ground and a second part spanned between the first parts,
Upon that concrete is a forming space of the second portion, the支保Engineering provided between the ground side, thereby constituting a more removable foam resin dissolve, open in a direction toward to the shoring A supply pipe having an injection hole drilled in a side wall is disposed on the side of the support work between the ground side and
After expressing the strength of the concrete cast in the formation space of the second part, the solvent is dissolved from the injection hole provided in the side wall of the supply pipe by pumping a solvent that dissolves the foamed resin into the supply pipe. the was injected into the shoring, the construction method of the substructure to be removed by construed dissolve the支保Engineering. The support work is made of foam resin square material, and a plurality of the support works are arranged on the ground in a posture in which the longitudinal direction is parallel,
The construction method of the foundation structure according to claim 1, wherein the supply pipe is configured by perforating a plurality of the injection holes at a predetermined interval .

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