JP5339199B2 - Method for forming composite member - Google Patents

Description

The present invention, two types of the self-hardening material Da設the mold frame, two types of self-hardening material is concerned in the formation how the composite member formed by integrally cured.

  2. Description of the Related Art Conventionally, concrete members (concrete structures) such as building columns and piers are constructed (formed) by placing concrete in a formwork that is installed so as to contain reinforcing bars. In general, the higher the strength level of concrete, the smaller the water binder ratio and the denser the structure of the hydrate. In addition, for example, resistance to deteriorated external forces such as salt and carbon dioxide (salt damage and neutralization) is increased. For this reason, as shown in Table 1, the durability design standard strength is determined according to the grade of the planned service period in the “Building Construction Standard Specification / Explanation JASS5 Reinforced Concrete Construction”.

  However, the higher the strength of concrete, the greater the amount of unit binder and the greater the expression of heat of hydration. Therefore, temperature cracking tends to occur when the cross section of the member becomes large, and sufficient wet curing is not performed. Cracks due to self-shrinkage and drying shrinkage are likely to occur. For this reason, there is a restriction on raising the strength level by simply using high-strength concrete, and high strength does not necessarily lead to high durability. In addition, since concrete with higher strength is generally more expensive, it is necessary to use concrete with higher strength than necessary just for ensuring durability against the structurally determined design standard strength. In terms of economic efficiency, it is not very reasonable.

  On the other hand, in Patent Document 1, an intermediate formwork in which a plurality of voids are formed is installed in a formwork, and a concrete concrete structure concrete is placed inside the intermediate formwork, and an outer formwork is placed outside the intermediate formwork. It is disclosed that cast concrete with high fluidity concrete is placed and two kinds of concrete are integrated to form a concrete member such as a pillar (a reinforced concrete structure, a composite member).

  And in this concrete member, the mechanical performance can be ensured by the inner structure concrete using ordinary concrete, and durability (resistance against deteriorated external force) is achieved by the dense covering concrete using high fluidity concrete. It becomes possible to secure. In addition, since inexpensive ordinary concrete is used on the inside and expensive high-fluidity concrete is used only on the outside, it is possible to form the concrete member at low cost while ensuring the mechanical performance as the structure.

  On the other hand, conventionally, a resin is applied to the surface of a concrete member, and this resin coating prevents penetration of deterioration factors and contact, thereby improving durability of the concrete member against salt damage, neutralization, frost damage, concrete corrosion, etc. Methods are also frequently used.

JP 2005-320765 A JP-A-2005-193142 JP 2006-1812 A

  However, in Patent Document 1, an intermediate mold having a plurality of voids in addition to the reinforcing bars is provided in the mold, and ordinary concrete and high-fluidity concrete are divided into the inside and outside defined by the intermediate mold. Therefore, there is a problem in that the work of installing the intermediate formwork is required at the time of construction (formation) of the concrete member, and the workability is lowered.

  Furthermore, when dividing the inside and outside with such an intermediate formwork, if the space of the intermediate formwork is large, the high-fluidity concrete will flow into the inside excessively, etc. In addition, if the void is small, sufficient integrity between the inside ordinary concrete and the outside high fluidity concrete cannot be secured.

  On the other hand, when resin is applied to the surface of a concrete member to improve durability, the resin coating often has defects such as pinholes or the resin coating peels off from the surface of the concrete member. And in order to ensure adhesion strength between the resin and the concrete member and prevent peeling, it is necessary to carefully adjust the surface of the concrete member (land surface adjustment) and ensure the desired durability. In order to achieve this, it is necessary to apply a plurality of resins such as primer, undercoat, intermediate coat, and top coat, which requires a lot of labor for painting work (construction).

In view of the above circumstances, the present invention provides a composite member capable of suitably forming a composite member obtained by placing two types of self-hardening materials in a mold and curing and integrating these two types of self-hardening materials. an object of the present invention is to provide a form how.

  In order to achieve the above object, the present invention provides the following means.

  In the method for forming a composite member of the present invention, two types of self-hardening materials are placed in a mold, and are integrated with one self-hardening material on the outside in the width direction and the other self-hardening material on the inside. A predetermined amount of one self-hardening material is placed in advance in the mold, and a supply port is embedded in the one self-hardening material in the mold The other self-hardening material is driven into the one self-hardening material from the supply port of the supply pipe arranged in this manner, and the other self-hardening material is sequentially placed from the supply port. A predetermined amount of the other self-hardening material is placed while the self-hardening material is pushed away toward the inner surface of the mold.

  In this invention, the intermediate mold is molded as in the prior art by sequentially placing the other self-hardening material while the other self-hardening material is previously pushed away to the inner surface side of the mold. It is possible to place the self-hardening material on the outside in the width direction and the other self-hardening material on the inside without partitioning the outside and inside with this intermediate mold. . And, by placing two kinds of self-hardening materials in this way, one outer self-hardening material and the other inner self-hardening material are reliably (strongly) integrated to form a composite member. Is possible.

  In the composite member forming method of the present invention, it is desirable that the one self-hardening material and the other self-hardening material are cement-based materials.

  In the present invention, for example, a high-fluidity concrete (cement-based material) is used as one self-hardening material and ordinary concrete (cement-based material) is used as the other self-hardening material to form a concrete member (composite member) such as a column. In this case, it is possible to form a concrete member in which high-fluidity concrete having high density and excellent durability on the outside and ordinary concrete for securing mechanical performance are arranged on the inside without using an intermediate mold. Moreover, it becomes possible to form a concrete member by reliably integrating these high fluidity concrete and ordinary concrete. Thereby, it is possible to improve the workability as compared with the conventional case and to form a concrete member having excellent durability at low cost.

  Furthermore, in the method for forming a composite member of the present invention, the one self-hardening material may be a resin, and the other self-hardening material may be a cement-based material.

  In the present invention, for example, a resin for preventing intrusion and contact of deterioration factors is used as one self-hardening material, and concrete (cement-based material) is used as the other self-hardening material, so that the surface of the concrete is resinized. It becomes possible to form a concrete member (composite member) in a state of being covered with. Then, by placing resin and concrete in the mold and curing the resin and concrete, it is possible to obtain a concrete member in which the resin coating is reliably integrated on the surface of the concrete. For this reason, compared with the case where resin is apply | coated to the surface of a concrete member like the past, defects, such as a pinhole, or a resin coating film do not peel. In addition, it is not necessary to carefully adjust the surface of the concrete member (adjustment of the base material) or to repeatedly apply resin. Thereby, it is possible to easily form a highly reliable concrete member having excellent durability against salt damage, neutralization, frost damage, concrete corrosion, and the like.

Oite formation how the composite member of the present invention is that by prior to pouring the one self-hardening material is pouring sequentially the other self-hardening material while allowing displaced on the inner surface of the mold, It is possible to place so that one self-hardening material is disposed on the outer side in the width direction and the other self-hardening material is disposed on the inner side without dividing the outer side and the inner side with an intermediate mold as in the prior art. Thereby, it becomes possible to form a composite member suitably by reliably integrating one outer self-hardening material and the other inner self-hardening material.

  And, for example, when using high-fluidity concrete as one self-hardening material and ordinary concrete as the other self-hardening material, when forming concrete members (composite members) such as pillars, compared with the case of using a conventional intermediate formwork In addition, the workability can be improved and a concrete member having excellent durability can be formed at low cost.

  Also, for example, when resin is used as one self-hardening material and concrete is used as the other self-hardening material, the resin and concrete are placed in the mold, and the resin and concrete are hardened. It is possible to obtain a concrete member in which the resin coating film is reliably integrated with the surface of. This makes it possible to easily form a highly reliable concrete member that is superior in durability against salt damage, neutralization, frost damage, concrete corrosion, etc., as compared with the conventional case where resin is applied to the surface of a concrete member. It becomes possible.

It is a figure which shows the formation method of the composite member (concrete member) which concerns on one Embodiment of this invention. It is a figure which shows the composite member (concrete member) which concerns on one Embodiment of this invention.

  Hereinafter, with reference to FIG. 1 (a)-(e) and FIG. 2, the formation method and composite member of the composite member which concern on one Embodiment of this invention are demonstrated. In this embodiment, two types of self-hardening materials are placed in a mold, and a composite member is formed by integrating one self-hardening material on the outside in the width direction and the other self-hardening material on the inside. Regarding the method and the composite member, in particular, high fluidity concrete (cement-based material) is used as one self-hardening material, and ordinary concrete (cement-based material) is used as the other self-hardening material, and a concrete member such as a pillar of a building is formed. The present invention relates to a method and a concrete member formed by this method.

  In the method for forming a concrete member 1 of this embodiment (a method for forming a composite member), as shown in FIG. 1 (a), the formwork 2 is placed so as to contain a reinforcing bar (not shown) arranged at a predetermined position. It is installed and a supply pipe 3 such as a tremy pipe is disposed at a predetermined position in the mold 2. Next, as shown in FIG. 1B, a predetermined amount of high-fluidity concrete 4 is poured into the mold 2 using the supply pipe 3 (a predetermined amount of one self-hardening material 4 is placed in advance). . At this time, in this embodiment, 20% or more of the amount of concrete (construction quantity) required for the concrete member 1 is the high-fluidity concrete 4 having a high strength level. The slump flow of the high fluidity concrete 4 is set to 50 cm or more and 65 cm or less.

  Next, as shown in FIG. 1 (c), the plain concrete 5 is taken from the supply port 3a of the supply pipe 3 provided by burying the supply port (cylinder tip) 3a in the high-fluidity concrete 4 poured into the mold 2. Place in the mold 2. At this time, in the present embodiment, the supply pipe 3 is disposed at the center of the mold 2 such that the axis O1 of the mold 2 and the axes O1 and O2 of the mold 2 are coaxially arranged. The mouth 3a) is disposed so as to be inserted into the high-fluidity concrete 4 by about 1 m (being buried by about 1 m). Then, the ordinary concrete 5 is continuously driven from the supply port 3a of the supply pipe 3 arranged in this way. Here, in the present embodiment, the ordinary concrete 5 is set at a strength level that is lower than the high-fluidity concrete 4 and satisfies the design standard strength. Moreover, the slump of the ordinary concrete 5 of this embodiment is 21 cm.

  When the ordinary concrete 5 is placed in this way, as shown in FIGS. 1C to 1E, the high-fluidity concrete 4 is formed into the formwork 2 by the ordinary concrete 5 placed in the high-fluidity concrete 4. Is pushed away to the inner surface 2a side (outside in the width direction T). Moreover, by placing the ordinary concrete 5 continuously, the ordinary concrete 5 gradually rises above the mold 2, and at the same time, the high-fluidity concrete 4 rises above the mold 2 and the mold 2. It is pushed away to the inner surface 2a side.

  At this time, if the launch speed is high, the ordinary concrete 5 that has been poured in later will rise on the high-fluidity concrete 4, and the high-fluidity concrete 4 will remain upward even if the ordinary concrete 5 is continuously cast thereafter. As it rises, it cannot be pushed away to the inner surface 2a side of the mold 2. For this reason, the ordinary concrete 5 is placed while being wrapped in the high-fluidity concrete 4 while being placed, while paying attention to the launch speed so as not to rise on the high-fluidity concrete 4.

  Further, the ordinary concrete 5 and the high fluidity concrete 4 are driven up, and the pressure acting on the supply port 3a (fluid pressure by the placed concrete 4 and 5) gradually increases. For this reason, when the cylinder tip (supply port 3a) of the supply pipe 3 is inserted into the concrete 4 and 5 for example 2.5 m or more, the state where the supply pipe 3 is inserted into the concrete 4 and 5 at least about 1 m is maintained. The ordinary concrete 5 may be placed by pulling it upward.

  Then, when a predetermined amount of ordinary concrete 5 is placed, as shown in FIG. 1 (e), the high-fluidity concrete 4 previously placed is pushed away to the inner surface 2a side of the mold 2 and moved outward in the width direction T. The ordinary concrete 5 is arranged on the inner side so as to be included in the high fluidity concrete 4. In this state, the supply pipe 3 is pulled out and compacted only inside the width direction T using a rod-like vibrator or the like. Then, the high-fluidity concrete 4 and the ordinary concrete 5 placed in the mold 2 are cured, and the mold 2 is removed when a predetermined strength is developed. Concrete member 1 (composite member) formed by integrating 4 and the inside ordinary concrete 5 is formed.

  This concrete member 1 is formed by placing ordinary concrete 5 so as to push away the previously cast high-fluidity concrete 4, and is not formed using an intermediate mold as in the prior art. The outer high-fluidity concrete 4 which is dense and excellent in durability and the inner ordinary concrete 5 for ensuring the mechanical performance are surely (solidly) integrated and formed.

  Therefore, in the method for forming the concrete member 1 and the concrete member 1 according to the present embodiment, the ordinary concrete 5 is sequentially placed while the high-fluidity concrete 4 previously placed is pushed away to the inner surface 2a side of the mold 2. Thus, an intermediate mold is provided in the mold 2 as in the prior art, and the high-fluidity concrete 4 having a high density and excellent durability on the outside in the width direction T without dividing the outside and the inside by the intermediate mold, It is possible to form the concrete member 1 provided with the ordinary concrete 5 for securing the mechanical performance. In addition, the high fluidity concrete 4 and the ordinary concrete 5 can be reliably integrated to form the concrete member 1. Thereby, it is possible to improve the workability as compared with the conventional case, and it is possible to form the concrete member 1 having high reliability and excellent durability at low cost.

Having described an embodiment of a formation how the composite member according to the present invention, the present invention is not limited to the embodiment described above, and can be suitably changed without departing from the scope thereof. For example, in this embodiment, one self-hardening material has been described as being a high-fluidity concrete 4 and the other self-hardening material is ordinary concrete 5. However, a cement-based material is used as both of these self-hardening materials. However, it is not necessary to limit to high fluid concrete or ordinary concrete, and for example, mortar may be used. At this time, if a cement-based material having a high fluidity at the time of casting and a high expression strength after curing is used for one self-hardening material, the same effect as this embodiment is achieved. It is possible to obtain

  Also, one self-hardening material and the other self-hardening material do not necessarily have to be cement-based materials. For example, a composite member using a resin for one self-hardening material and a cement-based material for the other self-hardening material May be formed. When one of the self-hardening materials is a resin for preventing intrusion and contact of deterioration factors and the other self-hardening material is concrete (cement-based material), the resin and concrete are placed in the mold 2. By placing the resin in the same manner as in the embodiment and curing the resin and the concrete, a concrete member in which the resin coating is reliably integrated on the surface of the concrete can be obtained. For this reason, defects such as pinholes or a resin coating film are not peeled off as in the case of applying a resin to the surface of a conventional concrete member. In addition, it is not necessary to carefully adjust the surface of the concrete member (adjustment of the surface), or to apply a plurality of resins such as primer, undercoat, intermediate coat, and top coat. Thereby, it is possible to easily form a highly reliable concrete member having excellent durability against salt damage, neutralization, frost damage, concrete corrosion, and the like.

1 Concrete member (composite member)
2 Form 2a Inner surface 3 Supply pipe 3a Supply port (cylinder tip)
4 High fluidity concrete (One self-hardening material, cement-based material)
5 Normal concrete (the other self-hardening material, cement-based material)
O1 Formwork axis O2 Supply pipe axis T Width direction

Claims (3)

A method of forming a composite member in which two types of self-hardening materials are placed in a mold and integrated with one self-hardening material arranged on the outside in the width direction and the other self-hardening material arranged on the inside. ,
A predetermined amount of one self-hardening material is placed in advance in the mold,
While placing the other self-hardening material into the one self-hardening material from the supply port of the supply pipe disposed so that the supply port is embedded in the one self-hardening material in the mold, Placing a predetermined amount of the other self-hardening material while the other self-hardening material sequentially placed from the supply port is pushed away to the inner surface side of the mold. A method for forming a composite member. In the formation method of the composite member according to claim 1,
The method of forming a composite member, wherein the one self-hardening material and the other self-hardening material are cement-based materials. In the formation method of the composite member according to claim 1,
The method of forming a composite member, wherein the one self-hardening material is a resin and the other self-hardening material is a cement-based material.

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