JP4812499B2 - Concrete soil structure and its construction method - Google Patents

Description

  The present invention relates to a concrete soil structure and its construction method. More specifically, the present invention relates to a concrete soil structure and a construction method thereof that blocks moisture from the ground and simplifies the treatment of surplus water during placement and curing after placement.

  Conventionally, the following problems are known in the construction between concrete soils.

    B) Since the hardening rate of concrete varies depending on the amount of water supplied from the ground, it is very difficult to grasp the timing of construction between concrete soils with hard finish.

    B) When the ground is acidic soil containing a large amount of sulfate, the quality of concrete deteriorates due to the chemical reaction between acidic soil and alkaline concrete.

  In order to solve such a problem and to standardize the construction, concrete construction is performed after covering the ground with a moisture-proof sheet in the construction between concrete soils.

  However, when concrete is placed after the ground is covered with a moisture-proof sheet, surplus water for improving the fluidity of the concrete springs up to the concrete surface after level adjustment. There is a problem that water is required to be discharged, and the construction is complicated and the construction period is prolonged.

  In addition, since the work is performed on the concrete surface after the level adjustment, there is a problem that the level needs to be readjusted and the construction period is further prolonged.

  Furthermore, there is a risk that the flow path of excess water will induce cracks after construction.

  The present invention has been made in view of such problems of the prior art, and while covering the ground with a moisture-proof sheet, it is possible to prevent excess water from flowing out and to simplify the concrete curing process and its construction. It aims to provide a method.

1st form of the concrete soil structure of this invention is a concrete soil structure provided with a moisture retention structure, and the moisture retention structure prevents moisture from the ground from being absorbed into the concrete, and the concrete. A moisturizing part that absorbs the excess water contained therein and releases the surplus water absorbed after the concrete has been hardened as curing water; and the moisturizing part absorbs the excess water and releases the curing water. and a waterproof portion that prevents full contact with the concrete after casting of the moisturizing section, the through hole is formed in the waterproof sheet constituting the waterproof portion, of the concrete to the hole It characterized that you have made a lid made of a material that dissolves by alkali components or moisture.

Moreover, the second form of the concrete interstitial structure of the present invention is a concrete interstitial structure provided with a moisturizing structure , and the moisturizing structure is formed in a sheet shape to prevent moisture from the ground from being absorbed into the concrete. the surplus moisture-proof unit, absorbs the excess water contained in the concrete are formed in the columnar body, and moisturizing section that release excess water absorbed after a certain curing of the concrete as a curing water, and the moisturizing unit for It consists of a waterproof part that absorbs water and releases the curing water, and prevents full contact with the concrete after placing the moisturizing part, and the columnar body constitutes the moisturizing part. The wrapping layer is made of a material that dissolves with an alkali component or moisture of concrete . In the 2nd form of the concrete soil structure of this invention, it is preferable that the weight reduction member is arrange | positioned in the center part of the core material.

On the other hand, the concrete interstitial construction method of the present invention is the concrete interstitial construction method according to any one of the above, wherein the crushed stone is laid to form a crushed stone foundation, and the moisturizing structure is disposed. And a step of placing concrete, a step of leveling the concrete, and a step of covering the concrete surface with a curing sheet after the concrete has been hardened.

  According to the present invention, surplus water contained excessively in the concrete to ensure the fluidity of the concrete is absorbed by the moisturizing structure after placing the concrete, while the absorbed surplus water is the curing water. As the water is reused, the drainage work of bleeding water is not required, and the water sprayed from the curing water after the concrete has hardened to a certain extent is reduced, improving work efficiency and workability and reducing the construction cost. An excellent effect of being reduced is obtained.

  In addition, according to the present invention, since drainage work on the concrete surface after level adjustment is eliminated, level readjustment is unnecessary, the work period is shortened, and the construction cost is further reduced. An effect is obtained.

  Furthermore, according to the present invention, since the ingress of moisture from the ground to the soil concrete is blocked, the excellent effect that the standardization of the construction can be achieved without affecting the construction by the characteristics of the ground.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
FIG. 1 shows a cross section of the main part of a concrete soil structure (hereinafter simply referred to as a soil structure) K according to Embodiment 1 of the present invention, and FIG.

  As shown in FIG. 1, the soil structure K is formed by interposing a moisturizing structure 10 between the crushed stone foundation 1 and the soil concrete 2.

  The moisturizing structure 10 is a three-layered body composed of a lower moisture-proof part 11 facing the crushed stone base 1, an intermediate moisture-retaining part 12, and an upper waterproof part 13.

  The moisture-proof part 11 is made of a moisture-proof sheet that has been conventionally used for the construction of the concrete soil 2 and functions to prevent moisture from the ground from being absorbed by the soil concrete 2.

  The moisturizing unit 12 is made of, for example, a laminated moisturizing sheet in which water absorbent paper is laminated or a non-woven fabric having water absorbency, absorbs excess water contained in the placed concrete, and the surplus water is used as bleeding water as a concrete surface. It functions to discharge excess water absorbed after concrete has hardened to a certain extent, while preventing it from springing out. Here, the thickness of the moisturizing portion 12 is appropriately adjusted according to the thickness of the concrete to be placed.

  The waterproof part 13 is made of, for example, a vinyl sheet, and the placed concrete and the moisturizing part 12 are in direct direct contact with each other, and moisture contained in the concrete is rapidly absorbed from the contact surface. Therefore, it functions to prevent the flowability during concrete construction and the hardening after construction from being hindered.

  As shown in FIGS. 1 and 2, the waterproof portion 13 is formed with through holes 13 a in a predetermined arrangement. The size and arrangement of the through holes 13a are adjusted so that the moisture contained in the concrete is absorbed by the moisturizing portion 12 at a speed that does not adversely affect the hardening of the concrete. In that case, in order to prevent moisture absorption by the moisturizing section 12 for a certain period after the concrete is placed, the water-poor 13a is formed by a lid 14 made of a material that has poor water absorption and dissolves due to the alkali component or moisture of the concrete, such as chitosan. May be closed.

  Next, construction of the soil structure K having such a configuration will be described.

  Procedure 1: A crushed stone base 1 is formed by spreading crushed stone.

  Procedure 2: The moisturizing structure 10 is laid on the crushed stone base 1.

  Procedure 3: Placing concrete on the moisturizing structure 10.

  Step 4: Level concrete.

  Procedure 5: After concrete has hardened to a certain extent, the concrete surface is covered with a curing sheet. (Surplus water contained in the concrete during the curing is absorbed by the moisturizing unit 12, while the surplus water absorbed during the curing is supplied from the moisturizing unit 12 to the concrete as curing water. )

  Procedure 6: After a predetermined curing period, remove the curing sheet. Thereby, the construction of the soil structure K is completed.

  Thus, in the interstitial structure K of the first embodiment, surplus water contained excessively in the concrete to ensure the fluidity of the concrete is absorbed by the moisturizing part 12 after placing the concrete, The absorbed surplus water is reused as curing water, eliminating the need for draining the bleeding water and reducing the watering of the curing water after the concrete has hardened to a certain extent. As a result, the construction cost is reduced. Further, since drainage work on the concrete surface after level adjustment is eliminated, level re-adjustment becomes unnecessary, the construction period is shortened, and the construction cost is further reduced. Furthermore, since the ingress of moisture from the ground to the soil concrete 2 is blocked, the characteristics of the ground do not affect the construction and the construction can be standardized.

Embodiment 2
FIG. 3 shows a cross section of the main part of a concrete soil structure (hereinafter simply referred to as soil structure) K1 according to Embodiment 2 of the present invention, and FIG.

  The dirt structure K1 is obtained by modifying the moisture retaining structure 10 of the dirt structure K of the first embodiment, and is obtained by changing the material of the moisture retaining portion 12. That is, the material of the moisturizing unit 12 is changed from a laminated moisturizing sheet or the like laminated with water absorbent paper to a sand layer to constitute the moisturizing structure 10A as the moisturizing unit 15. Here, the thickness of the moisturizing portion 15 is appropriately adjusted according to the thickness of the concrete to be placed. In the figure, reference numeral 3 denotes a soil reinforcing bar.

  The remaining structure of the soil structure K1 is the same as that of the soil structure K.

  Since the soil structure K1 of the second embodiment is configured as described above, the surplus water contained excessively in the concrete in order to ensure the fluidity of the concrete, like the soil structure K of the first embodiment, After the concrete is placed, it is absorbed by the moisturizing unit 15 and the absorbed surplus water is reused as curing water, so that the draining work of bleeding water is not necessary and the concrete is hardened to a certain extent. Since watering of the curing water is reduced, work efficiency and workability are improved, and construction costs are reduced. Further, since drainage work on the concrete surface after level adjustment is eliminated, level re-adjustment becomes unnecessary, the construction period is shortened, and the construction cost is further reduced. Furthermore, since the ingress of moisture from the ground to the soil concrete 2 is blocked, the characteristics of the ground do not affect the construction and the construction can be standardized.

Embodiment 3
FIG. 5 shows a cross section of the main part of a concrete soil structure (hereinafter simply referred to as soil structure) K2 according to Embodiment 3 of the present invention.

  The dirt structure K2 is obtained by modifying the moisture retaining structure 10 of the dirt structure K of the first embodiment. The moisture retaining part 11, the moisture retaining part 12, and the waterproof part 13 are separated to form the moisture retaining structure 10B. It is supposed to be.

  As shown in FIG. 5 and FIG. 6A, the soil structure K2 is configured such that the moisturizing portion 12 and the waterproof portion 13 are formed into a columnar body 20 having moisture retention properties, and are embedded in the soil concrete 2 at appropriate intervals. It is supposed to be. Note that the columnar body 20 is not limited to a columnar shape, and may have various shapes. For example, it may be a hexagonal column shape.

  That is, the columnar body 20 includes a core material 21 that constitutes the moisture retaining portion 12 and a wrap layer 22 that covers the core material 21 and constitutes the waterproof portion 13. Here, the magnitude | size and arrangement | positioning space | interval of the cylindrical body 20 are suitably adjusted according to the thickness of the concrete to lay.

  In addition, as shown in FIG. 6B, the columnar body 20 is provided with a weight reducing member 23 such as a polystyrene foam at the center of the core material 21 to reduce the weight of the columnar body 20. Also good.

  The core material 21 is formed by filling a cylindrical body formed of a wrap layer 22 with, for example, a water-absorbing nonwoven fabric or sand.

  The wrap layer 22 is formed by molding a material that is dissolved with an alkali component of concrete or moisture, for example, chitosan into a cylindrical body. The thickness is adjusted so as to dissolve in several hours after the concrete is placed. Here, the dissolution does not need to be complete dissolution, and may be dissolution to such an extent that absorption of surplus water and release of curing water can be achieved, for example, mottled pattern dissolution.

  Further, the wrap layer 22 is formed of a material that is not dissolved by the alkali component or moisture of the concrete, and a through hole for absorbing excess water and discharging the curing water by the core material 21 is formed. Alternatively, it may be closed with a lid formed of a material dissolved with water.

  Since the soil structure K2 of the third embodiment is configured as described above, the surplus water contained excessively in the concrete in order to ensure the fluidity of the concrete, like the soil structure K of the first embodiment, After the concrete is placed, it is absorbed by the core material 21 and the absorbed surplus water is reused as curing water, so that the draining work of bleeding water becomes unnecessary and the concrete has been cured to a certain degree. Since watering of the curing water is reduced, work efficiency and workability are improved, and construction costs are reduced. Further, since drainage work on the concrete surface after level adjustment is eliminated, level re-adjustment becomes unnecessary, the construction period is shortened, and the construction cost is further reduced. Furthermore, since the ingress of moisture from the ground to the soil concrete 2 is blocked, the characteristics of the ground do not affect the construction and the construction can be standardized.

  The present invention can be applied between concrete soils.

It is principal part sectional drawing of the soil structure which concerns on Embodiment 1 of this invention. It is the same top view. It is principal part sectional drawing of the soil structure which concerns on Embodiment 2 of this invention. It is the same perspective view. It is principal part sectional drawing of the soil structure which concerns on Embodiment 3 of this invention. It is sectional drawing of the cylindrical body of the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crushed stone base 2 Concrete between soil 10 Moisturizing structure 11 Moisture-proof part 12,15 Moisturizing part 13 Waterproof part 13a Through-hole 14 Lid 20 Cylindrical body 21 Core material 22 Lap layer 23 Lightening member K Dirt structure

Claims (4)

A concrete soil structure with a moisturizing structure,
The moisturizing structure absorbs excess water contained in the moisture-proof part that prevents moisture from the ground from being absorbed into the concrete, and cures the excess water that has been absorbed after the concrete has been hardened. A moisturizing part that discharges as water, and a waterproof part that causes the moisturizing part to absorb the surplus water and release the curing water, and prevents full contact with the concrete after placement of the moisturizing part. equipped with a,
Wherein the through hole in the waterproof sheet constituting the waterproof portion is formed, and the lid comprising a material which dissolves by alkali components or moisture of the concrete is not made to the hole concrete earthen structures characterized by Rukoto. A concrete soil structure with a moisturizing structure,
The moisture retaining structure is formed in a sheet shape to prevent moisture from the ground from being absorbed into the concrete, absorbs excess water contained in the concrete formed in the columnar body , and A moisturizing part that discharges surplus water absorbed after a certain amount of curing as curing water , and makes the moisturizing part absorb the surplus water and release the curing water, It consists of a waterproof part that prevents full contact ,
The columnar body is composed of a core material constituting a moisturizing part and a wrap layer constituting a waterproof part,
A concrete soil structure, wherein the wrap layer is made of a material that dissolves due to alkali components or moisture of concrete. The concrete soil structure according to claim 2 , wherein a lightening member is disposed at the center of the core material. It is the construction method of the concrete soil structure as described in any one of Claims 1 thru | or 3 ,
A procedure for laying crushed stone and forming a crushed stone foundation;
A procedure for arranging the moisturizing structure;
The steps of placing concrete;
The steps to level the concrete,
A method for constructing a concrete soil structure, comprising the step of covering a concrete surface with a curing sheet after the concrete has been hardened.

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