JP2007169982A - Form for placing concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form for placing concrete, which eliminates time and effort for setting a heating body, and contributes to reduction of power consumption. <P>SOLUTION: The form 3 for placing concrete has cylindrical reinforcing ribs 35 of a closed cross section, formed along an inner surface of an external wall 321 abutting on the concrete C, at a plurality of locations. Then hot air generators 42 are provided for the form, and hot air feeding pipes are connected to one-side cylinder openings of the reinforcing ribs 35, respectively, via a blast pipe 43 and a header pipe 44 which are extended from each hot air generator 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a concrete casting form, and more particularly to a concrete casting form that can be suitably used when placing concrete for lining such as a tunnel.

When placing concrete for secondary lining of tunnels, etc., especially in cold districts, the concrete curing temperature is considerably lower than the appropriate temperature (20-30 ° C). It takes time and the construction period is extended. Therefore, in Patent Document 1, for example, a sheet heating element made of a carbon graphite film is attached to the back of a panel of a formwork that comes into contact with concrete, and the curing period is shortened by heating the concrete immediately after placing and keeping the concrete at an appropriate temperature. Has been proposed.
Reality 6-36169

  However, the conventional structure has a problem that the equipment cost increases because the sheet heating element is laid on the entire back surface of the panel, especially when the mold is enlarged.

  Therefore, the present invention solves such a problem, and an object of the present invention is to provide a concrete placement form that can save the installation cost and reduce the equipment cost.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a formwork for placing concrete, which is provided with cylindrical reinforcing ribs having closed cross sections at a plurality of positions along the inner surface of the outer wall in contact with the concrete. In FIG. 2, a heat medium supply source is provided, and a heat medium supply path extending from the heat medium supply source is communicated with one end cylindrical opening of at least one reinforcing rib. Here, either a liquid or a gas can be used as the heat medium.

  In the first aspect of the present invention, a heat medium having an appropriate temperature is supplied from a heat medium supply source through a heat medium supply path and circulated into the cylindrical space of the reinforcing rib provided on the inner surface of the outer wall of the mold frame in contact with the concrete. Therefore, the concrete immediately after placing is heated in a cold district or the like and is kept at an appropriate temperature. As a result, the initial temperature of the concrete increases, and the curing period can be greatly shortened. In the first aspect of the present invention, the cast concrete is kept at an appropriate temperature by supplying a heat medium into the cylindrical space by using the reinforcing ribs conventionally provided to increase the strength of the formwork. Therefore, the troublesome work of laying a sheet heating element as in the prior art becomes unnecessary, and the equipment cost can be kept low.

  According to the second aspect of the invention, a concrete reinforcing frame (3) is provided with cylindrical reinforcing ribs (35) having closed cross sections at a plurality of positions along the inner surface of the outer wall (321) in contact with the concrete (C). In the provided formwork (3), a hot air generator (42) is provided, and a hot air supply path (45) extending from the hot air generator (42) is communicated with one end cylindrical opening of at least one reinforcing rib (35). .

  Also in the second invention, the same effect as the first invention can be obtained, and when hot air is used as the heat medium, the sealing structure can be simplified as compared with the case where hot water is used.

  In the third aspect of the invention, the mold (3) is formed by joining a plurality of mold members (31) having a constant width at the edges of each other, and each mold member (31) is provided on this. The reinforcing ribs (35) are connected in a state where the positions of the reinforcing ribs (35) coincide with each other and the cylindrical space (S) communicates.

  The third invention can be suitably applied to a concrete casting form for a tunnel that is relatively long.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the present invention, there is no need to install a heating element as in the prior art, and the equipment cost can be kept small.

  FIG. 1 shows a cross section of a tunnel slide centle provided with the concrete casting form of the present invention. In FIG. 1, a slide center 1 includes a portal gantry 2 through which a vehicle can pass, and an arch-shaped form 3 disposed so as to cover the upper half of the gantry 2 is supported by the gantry 2. A concrete C for secondary lining is placed between the outer peripheral wall of the mold 3 and the inner peripheral wall of the tunnel T. The gantry 2 has a certain length in the front-rear direction perpendicular to the paper surface. A wheel 22 is provided at the lower end of the leg portion 21 at the front-rear end and is positioned on the rail 23. Further, auxiliary jacks 25 are provided at the lower ends of the plurality of leg portions 24 located in the middle of the gantry 2 in the front-rear direction. Note that the left and right halves in FIG. 1 are cross sections at different positions in the longitudinal direction of the gantry.

  The formwork 3 is configured by connecting a plurality of identical formwork members 31 having a constant width in the front-rear direction, and each frame member 31 is provided on the top end foam 32 positioned at the top and on the bottom surfaces of both ends of the top end form 32. It is comprised from the lower form 34 connected to the lower end of the side foam 33 which is connected so that rotation is possible, and located in both sides, and the lower end of the side foam 33 so that rotation is possible. The top end form 32 is supported by a plurality of jacks 26 provided in the front-rear direction on the top of the gantry 2 so as to be movable up and down. The side foam 33 and the lower foam 34 are connected to the legs 21 and 24 of the gantry 2 by jacks 27 and 28, respectively, and are rotated inward and outward.

  The top form 32, the side form 33, and the bottom form 34 constituting the formwork member 31 have a number of reinforcing ribs extending in parallel in the front-rear direction (width direction of the formwork member 31) on the inner surface of the outer peripheral wall in contact with the concrete C. As shown in FIG. 2, these reinforcing ribs 35 are formed into a cylindrical shape with a closed cross section by joining the opening edge of a plate material bent in a substantially U shape to the inner surface of the outer peripheral wall 321, or a pair of U The shape steel is abutted to form a cylinder with a closed cross section. FIG. 2 shows a frame 36 that constitutes the central portion of the top end form 32, which is composed of inner and outer double walls, and the reinforcing ribs 35 and a large number of rib members 37 are provided in the closed space. The basic structures of the other frames 38 and 39 (FIG. 1) of the top end form 32, the side form 33, and the lower end form 34 are basically the same.

  As shown in FIGS. 3 and 4, the frames 36 of the top end forms 32 of the plurality of mold members 31 are connected so that the reinforcing ribs 35 coincide with each other. Through holes 362 are provided in the plate, and the cylindrical spaces S of the reinforcing ribs 35 of all the frames 36 are communicated with each other. On the other hand, a support plate 41 projects from one end of the frame 36 located at the end in the longitudinal direction, and a hot air generator 42 is installed on the support plate 41. The hot air generator 42 includes an inverter-controlled motor 44 and a fan 45 driven by the motor. The blower pipe 43 of the hot air generator 42 is connected to a header pipe 44, and a number of hot air supply pipes 45 extend from the header pipe 44, and each of these hot air supply pipes 45 is located at an end in the longitudinal direction. It is connected to a through hole 363 provided in the end plate 361 of the frame 36 and communicates with the cylindrical space S of each reinforcing rib 35. Corresponding to these, the other frames 38, 39 of the top end form 32, the side form 33, and the lower end form 34 are provided with hot air generators 42 (FIG. 1), and the reinforcing ribs 35 have the same structure as described above. The hot air supply pipe 45 communicates with the cylindrical space S. In FIG. 3, the number of reinforcing ribs 35 is less than the actual number in order to facilitate understanding.

  With such a structure, hot air at an appropriate temperature (for example, 60 ° C.) is supplied and circulated in the cylindrical space S of the reinforcing rib 36 provided on the inner surface of the outer peripheral wall of the mold 3 in contact with the concrete. In concrete, the concrete immediately after placing is heated and kept at an appropriate temperature, and as a result, the curing period of the concrete can be greatly shortened. In the present embodiment, the cast concrete is kept at an appropriate temperature by supplying hot air into the cylindrical space S by using the reinforcing ribs 36 that are conventionally provided to increase the strength of the mold 3. Therefore, the troublesome work of laying the planar heating element becomes unnecessary, and the power consumption can be kept low.

  In the above embodiment, instead of connecting the hot air supply pipes to the respective reinforcing ribs, the opening ends of the plurality of reinforcing ribs are connected in series with the pipes to form the folded flow path with these reinforcing ribs, The hot air supply pipe may be connected to the most upstream reinforcing rib connected in series. In the above embodiment, hot air is used as the heat medium, but it is of course possible to use hot water.

1 is a cross-sectional view of a tunnel slide centle provided with a concrete casting form, showing an embodiment of the present invention. It is a cross-sectional view of the frame of the top end form constituting the formwork member, showing an embodiment of the present invention. It is a perspective view of the frame of the top form foam which comprises a formwork member which shows one Embodiment of this invention. It is a side view of the frame of the top end form which constitutes a formwork member showing one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Slide centle, 2 ... Gantry, 3 ... Formwork, 31 ... Formwork member, 32 ... Top end foam, 321 ... Outer wall (outer wall), 33 ... Side foam, 34 ... Lower end foam, 35 ... Reinforcement rib, 36 ... frame, 42 ... hot air generator, 45 ... hot air supply pipe (hot air supply path), C ... concrete, S ... cylindrical space.

Claims (3)

A formwork for placing concrete, wherein the heat medium supply source is provided in the formwork provided with cylindrical reinforcing ribs having closed cross sections at a plurality of positions along the inner surface of the outer wall in contact with the concrete, and at least one of the above-mentioned A concrete casting form characterized in that a heat medium supply path extending from the heat medium supply source is communicated with a cylindrical opening of one end of a reinforcing rib. The heating medium supply source is a mold for placing concrete, and a hot air generator is provided in a mold provided with cylindrical reinforcing ribs having closed cross sections at a plurality of positions along the inner surface of the outer wall in contact with the concrete. A concrete placement form, wherein a hot-air supply path extending from the hot-air generator is communicated with one end cylindrical opening of at least one reinforcing rib. The formwork is configured by joining a plurality of formwork members having a constant width at the edges of each other, and each formwork member has a cylindrical space formed by aligning the positions of the reinforcing ribs provided on the formwork members. The formwork for concrete placement according to claim 1 or 2, wherein the formwork is connected in a connected state.

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