JP4252604B2 - Reinforced concrete produced by laterally divided production method and laterally divided production method - Google Patents

Description

  The present invention relates to a reinforced concrete laterally divided manufacturing method and a reinforced concrete manufactured by a laterally divided manufacturing method.

  The underground continuous wall that is one of the underground structures is formed by replacing a groove formed in the ground with a reinforced concrete using an excavator. A long continuous underground wall is generally formed by dividing in the lateral direction. Here, the concrete cutting method which is one of the horizontal direction division | segmentation formation methods of an underground continuous wall is demonstrated using FIG.

First, as shown in FIG. 2A, a groove A is excavated in the ground, a reinforcing bar is provided in a predetermined shape, and concrete is poured into the groove A, thereby forming a preceding reinforced concrete wall A1. Next, as shown in FIG. 2 (B), a groove A ′ having the same shape as the groove A is provided on the extension of the reinforced concrete wall A1, with a space slightly narrower than the width of the excavator for forming the groove. Excavate and form a preceding reinforced concrete wall A2 as well. Next, as shown in FIG. 2C, the groove B is formed between the preceding reinforced concrete wall A1 and the preceding reinforced concrete wall A2. At this time, since the distance between the preceding reinforced concrete wall A1 and the preceding reinforced concrete wall A2 is narrower than the width of the excavator, both ends of the preceding reinforced concrete walls A1 and A2 on the groove B side are partially cut. Next, the reinforcing steel used for the following reinforced concrete is provided in a predetermined shape, and the concrete is poured into the groove B, thereby forming the succeeding reinforced concrete wall B1 following the preceding reinforced concrete wall. By repeating these steps, one continuous underground continuous wall was formed.
Japanese Patent Laid-Open No. 7-90841 Japanese Utility Model Publication No. 7-13909 JP-A-9-53228

  However, in the concrete cutting method described above, the horizontal rebar is discontinuous at the connecting part between the preceding reinforced concrete wall and the following reinforced concrete wall, so the underground continuous wall formed by the concrete cutting method is in the horizontal direction of the wall. It was difficult to adopt in places where bending tensile stress was generated.

  The subject of this invention is providing the horizontal direction division | segmentation production method of a reinforced concrete which can connect a horizontal rebar reliably in a stable liquid also in a concrete cutting system. It is another object of the present invention to provide a reinforced concrete produced by dividing in the transverse direction.

In order to solve the above problems, the invention according to claim 1 is a method of manufacturing a reinforced concrete by dividing it in a transverse direction, and connecting one end of a shape memory alloy rod to the end of one of the reinforcing bars,
After bending the shape memory alloy rod and curing with a filling made of a material that allows the bent portion of the shape memory alloy rod to easily return to a straight shape around the bent portion of the shape memory alloy rod,
Concrete is cast on one reinforcing bar having the shape memory alloy rod at one end to form a preceding reinforced concrete, the end of the preceding reinforced concrete is removed, the padding is exposed to the outside, and heat is applied to the bent portion. By making the shape memory alloy rod straight, the other end of the shape memory alloy rod is taken out of the preceding reinforced concrete and overlapped with the other reinforcing bar, and the concrete is placed on the other reinforcing rod. Reinforced concrete is formed following the end of the preceding reinforced concrete.

  Here, as the shape memory alloy rod, for example, a Ni—Ti rod having the same strength as a reinforcing bar is used.

  According to the method for producing a reinforced concrete in the transverse direction according to the first aspect, a lap joint is formed by a shape memory alloy bar between one reinforcing bar and the other reinforcing bar. That is, it is possible to realize a connection method in which the connecting portion between the one reinforcing bar and the other reinforcing bar has the same strength as that of a normal reinforcing bar. Further, even if the shape memory alloy rod is arbitrarily deformed at the time of connection, the shape memory alloy rod is restored to a straight shape by heating to a temperature equal to or higher than the transformation temperature.

  The means for applying heat to the bent portion includes, for example, a nichrome wire attached to the shape memory alloy rod and a conductive wire for supplying electric power to the nichrome wire from the outside.

  Here, as the stuffing, for example, styrene foam, urethane foam, paraffin or the like is used. There are no restrictions on the reinforcing bars and concrete used.

  According to the first aspect of the present invention, since the reinforced concrete of the preceding reinforced concrete and the reinforcing steel of the subsequent reinforced concrete form a lap joint through the connection tool, the connecting portion between the preceding reinforced concrete and the subsequent reinforced concrete is normal reinforced concrete. Equivalent strength.

  Invention of Claim 2 is the reinforced concrete produced by the horizontal direction division | segmentation production method of Claim 1. It is characterized by the above-mentioned.

  According to the second aspect of the present invention, it is possible to produce a reinforced concrete structure that does not have a low strength portion and that is not limited in length by the production method.

  According to invention of Claim 1, the connection part of one reinforcing bar and the other reinforcing bar has the intensity | strength comparable as a normal reinforcing bar. Further, even if the shape memory alloy bar is deformed when the preceding reinforced concrete wall is produced, the shape memory alloy bar returns to a straight shape by being heated to the transformation temperature or higher, so that a lap joint can be easily formed.

  According to the first aspect of the present invention, the shape memory alloy having a transformation temperature higher than the heat of hardening of the concrete is used for the shape memory alloy rod, so that the shape can be directly adjusted without adversely affecting the quality of the preceding concrete. Can be restored.

  Further, according to the first aspect of the present invention, the reinforced concrete produced by dividing the reinforced concrete into the preceding reinforced concrete and the following reinforced concrete in the lateral direction is the same as the normal reinforced concrete at the connecting portion between the preceding reinforced concrete and the following reinforced concrete. Has the same strength.

  According to the second aspect of the present invention, it is possible to produce a reinforced concrete structure that does not have a low strength portion and that is not limited by the production method in the lateral length.

  Hereinafter, with reference to FIG. 1, the underground continuous wall 102 using the connector 3 which is a 2nd embodiment of this invention is demonstrated. FIG. 1 is a diagram showing a method for producing the underground continuous wall 102 using a plan view. In practice, a plurality of horizontal reinforcing bars 11a and a plurality of horizontal reinforcing bars 21a are provided, and a plurality of connecting tools 3 are used correspondingly, but only one of each is used for convenience of explanation.

  First, the structure of the underground continuous wall 102 will be described with reference to FIG. In FIG. 1C, the underground continuous wall 102 is composed of a preceding reinforced concrete wall 11 and a succeeding reinforced concrete wall 21, similarly to the underground continuous wall 100, and the horizontal reinforcing bar 11 a and the succeeding reinforced concrete wall 11. The horizontal reinforcing bar 21 a of the reinforced concrete wall 21 is connected using the connection tool 3.

  The connector 3 includes a shape memory alloy rod 3a that stores a shape in a straight shape, an electric heating mechanism 3b (heating means) that is attached to the shape memory alloy rod 3a and heats the shape memory alloy 3a, and a shape memory. A fixed pipe 3c that fixes one end 3a1 of the alloy bar 3a to the horizontal reinforcing bar 11a.

  The shape memory alloy bar 3a is formed of, for example, a Ni—Ti alloy or a copper alloy, and stores a shape in a straight shape by performing a predetermined treatment in advance. The shape memory rod 3a has a lap joint length necessary for design.

  The energization heating mechanism 3b has, for example, a deformed shape having a nichrome wire wound around a shape memory alloy rod 3a as a heat generating portion and an energization wire (not shown) for supplying electric power to the nichrome wire from the ground. The memory alloy bar 3a is heated by the nichrome wire to return to a straight shape.

  The fixed pipe 3c is, for example, a steel pipe that is slightly larger than the horizontal reinforcing bar 11a. The horizontal reinforcing bar 11a is threaded to the inside of the fixed pipe 3c, the end of the horizontal reinforcing bar 11a, and the end of the shape memory alloy bar 3a. The shape memory alloy rod 3a is fixed. Alternatively, the shape memory alloy bar 3a may be fixed to the horizontal rebar 11a by welding or an adhesive via the fixed pipe 3c.

  The preceding reinforced concrete wall 11 and the succeeding reinforced concrete wall 21 have the same configuration as the underground continuous wall 100.

  Next, the manufacturing method of the underground continuous wall 102 is demonstrated using FIG. 1 (A)-the same figure (C).

  First, the groove | channel 10 corresponding to the preceding reinforced concrete wall 11 is formed using an excavator (illustration omitted) etc. (FIG. 1 (A)). Next, on the ground, the reinforcing bars used for the preceding reinforced concrete wall 11 are formed using the horizontal reinforcing bars 11a and the vertical reinforcing bars 11b, 11b. Next, one end 3a1 is fixed to the horizontal reinforcing bar 11a in a state where the shape memory alloy bar 3a is bent using the fixing pipe 3c. Next, the heat generating part of the energization heating mechanism 3b is attached to the bent part 3a3 of the shape memory alloy bar 3a. Next, after the bent portion 3a3 of the shape memory alloy bar 3a is covered with the stuffing 4 such as styrofoam so as to include the bent portion 3a3, the reinforcing bar basket is built in the groove 10. Next, concrete is poured into the groove 10 to complete the preceding reinforced concrete wall 11. Next, the groove 20 is formed in the same manner as the groove 10 between another preceding reinforced concrete wall (not shown). Here, since the end surface 11c of the preceding reinforced concrete wall 11 is cut by cutting, the padding 4 is exposed (FIG. 1B).

  Next, the bending portion 3a3 of the shape memory alloy rod 3a is heated by the energization heating mechanism 3b. Here, since the tip of the bent portion 3a3 of the shape memory alloy bar 3a is covered with the padding 4, the shape memory alloy bar 3a easily returns straight and jumps out of the padding 4 and enters the groove 20 Get in. Next, after the shape memory alloy bar 3a is returned to the position immediately above, the padding 4 is removed with a joint cleaning material or a water jet. Next, the reinforcing bar used for the succeeding reinforced concrete wall 21 is built in the groove 20 using the horizontal reinforcing bars 21a and the vertical reinforcing bars 21b, 21b. Subsequently, the concrete is poured into the groove 20 and hardened, thereby forming the succeeding reinforced concrete wall 21 on the end surface 11 c of the preceding reinforced concrete wall 11. Thereby, joining of the underground continuous wall 102 is completed (FIG.1 (C)).

  In the underground continuous wall 102 formed in this way, the horizontal reinforcing bar 11a of the preceding reinforced concrete wall 11 and the horizontal reinforcing bar 21a of the succeeding reinforced concrete wall 21 form a lap joint through the connector 3, so that the leading reinforced concrete wall 11 Even in the connection portion between the reinforced concrete wall 21 and the subsequent reinforced concrete wall 21, the underground continuous wall 102 has the same strength as the reinforced concrete wall having no joint. In addition, the length of the underground continuous wall 102 is limited by the production method by continuously producing another succeeding reinforced concrete wall following the other preceding reinforced concrete wall (not shown) in the same procedure. It can be extended without.

  In the case where a plurality of connection tools 3 are used, the entire structure is simplified if all the heat generating portions are provided in series with the energizing wires.

It is a figure which shows the preparation method of the underground continuous wall 102 which connected the horizontal reinforcement 11a of the preceding reinforced concrete wall 11, and the horizontal reinforcement 21a of the succeeding reinforced concrete wall 21 using the connection tool 3 of this invention. It is a figure which shows the preparation methods of the preceding reinforced concrete wall A1, A2 and the succeeding reinforced concrete wall B in the underground continuous wall by the concrete cutting system as a prior art example.

Explanation of symbols

3 Connector 3a Shape memory alloy bar 3b Electric heating mechanism (heating means)
3c fixed pipe 4 padding 10, 20 groove 11 preceding reinforced concrete wall (preceding reinforced concrete)
21 Backing reinforced concrete wall (backing reinforced concrete)
11a Horizontal rebar (one rebar)
21a Horizontal reinforcing bar (the other reinforcing bar)
102 underground continuous wall

Claims (2)

It is a method of making reinforced concrete by dividing it in the transverse direction,
Connect one end of the shape memory alloy rod to the end of one rebar,
Bending the shape memory alloy rod,
After curing the periphery of the bent portion of the shape memory alloy rod using a stuffing made of a material that allows the bent portion of the shape memory alloy rod to easily return straight,
Placing concrete on one rebar having the shape memory alloy rod at one end to form a preceding reinforced concrete,
The end of the preceding reinforced concrete is removed, the padding is exposed to the outside, and heat is applied to the bent portion to straighten the shape memory alloy rod, so that the other end of the shape memory alloy rod is connected to the preceding reinforced concrete. Take it out and overlay it with the other rebar,
A method for laterally dividing and producing a reinforced concrete, comprising forming concrete on the other reinforcing bar to form a succeeding reinforced concrete at an end of the preceding reinforced concrete.   Reinforced concrete produced by the transversely divided production method according to claim 1.

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