JP4072089B2 - Curing method and curing device for concrete segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a curing method and a curing device for a concrete segment.
[0002]
[Prior art]
The concrete segment used for shield tunnels is generally a manufacturing form with an upwardly convex arc shape when viewed from the side, and an upper part is opened. It is manufactured by placing (striking). Then, after steam curing is performed in the steam chamber, demolding is performed.
[0003]
Moreover, there exist patent documents 1-3 as prior art literature regarding curing of a concrete segment, for example. In patent document 1, after shaping | molding the upper surface of the concrete molded product in a mold, it mounts and fixes in order of a nonwoven fabric, a textile fabric, and a perforated shaping board, and performs steam curing. In Patent Document 2, high-fluidity concrete is filled in a mold, preheated, and then heated to a predetermined curing temperature for steam curing. As the mold, a lid mold having a large number of slits formed vertically is used. In Patent Document 3, after placing high-fluidity concrete in a closed-type segment manufacturing formwork, steam curing is performed at 30 to 50 ° C, and after 2 to 4 hours, the cover formwork is removed, and the concrete surface is finished with scissors. ing.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-103313 [Patent Document 2]
JP 2000-71232 A [Patent Document 3]
Japanese Patent Laid-Open No. 11-278960
[Problems to be solved by the invention]
At present, steam curing is often used after concrete is placed to quickly remove the mold and measure the rotation of the formwork. However, steam curing does not have a positive effect on concrete, and Causes shrinkage. Nor does it have a positive impact on the use of fuel to produce steam and the good environment.
[0006]
In Cited Documents 1 to 3, in order to produce a good concrete segment free from defects in steam curing, a relatively high cost curing member or a special curing process is required.
[0007]
The present invention has been made to solve such problems. The purpose of the present invention is to produce a concrete segment free from cracks in the concrete or surface defects of the concrete by curing by natural drying, and relatively easily. An object of the present invention is to provide a concrete segment curing method and a curing apparatus capable of producing a good concrete segment free of defects with a low-cost curing member having a simple structure.
[0008]
[Means for Solving the Problems]
Claim 1 of the present invention is a curing method for a concrete segment manufactured by an upwardly convex arcuate segment manufacturing form , and after the concrete is placed in the segment manufacturing form , the segment is manufactured. diagonal bars to the longitudinal direction along the arc of the use formwork (bamboo, a synthetic resin material, etc.) is configured in partnership to mesh, not covering the entire mold top and side plates form the ends of the rod member is the size of the mesh plate projecting outwardly from the frame and the end plate mold, on the segment manufacturing mold, at a predetermined distance from the upper surface of pouring the concrete, bars segment manufacturing mold In addition to being inclined with respect to the longitudinal direction along the arc, and the end of the bar so as to protrude outward from the side plate frame and the end plate frame , a water-absorbing sheet ( Sponge material, non-woven paper, non-woven fabric, etc.) Covering the mesh plate is additionally provided a curing process of the concrete segment and performing the curing in a moisturizing state by the sheet of mesh plate and water absorption.
[0009]
Claim 2 of the present invention is a curing device for a concrete segment manufactured by an arc-shaped segment manufacturing form that is convex upward, and is oblique to the longitudinal direction along the arc of the segment manufacturing form. bar (bamboo, a synthetic resin material, etc.) is configured to teamed in mesh, it has covered the entire mold top and the size of the end of the rod member protrudes outward from the side plate mold and the end plate formwork The mesh plate and the bar are arranged so as to be inclined with respect to the longitudinal direction along the arc of the segment manufacturing formwork, and the end of the bar is projected outward from the side plate formwork and the end plate formwork. An interval holding tool for holding the mesh plate on the segment manufacturing formwork at a predetermined distance from the upper surface of the concrete on which the mesh plate is placed, and a fixing tool (clip for fixing the mesh plate on the upper part of the segment manufacturing formwork. And vise) A concrete segment comprising a water-absorbing sheet (sponge material, non-woven paper, non-woven fabric, etc.) attached to the plate and covering the mesh plate, and a fastener for attaching the sheet to the upper surface of the formwork It is a curing device. As the interval holder, a rising piece protruding above the end plate mold of the segment manufacturing mold and a rod-like mold interval holder extending over the upper surface of the center of the mold can be used.
[0010]
In the above configuration, after placing concrete in the formwork, after initial hardening of the concrete (depending on the season, for example, about 2 to 3 hours after placing the concrete), mesh on the formwork A water-absorbing sheet is placed and fixed through a plate, and curing is performed by natural drying in a moisturized state with a mesh plate and a water-absorbing sheet.
[0011]
After the concrete is placed in the mold, the water in the concrete evaporates. After the initial hardening of the concrete, the water evaporation causes cracks in the concrete, so it is necessary to keep the moisture moist. Water absorption sheets such as a curing sponge material, non-woven paper, and non-woven fabric provided at a predetermined distance from the concrete surface by a mesh plate catch the evaporated water and keep the wet state. Furthermore, even when external air heat is applied from the surface of the concrete and the evaporation of moisture becomes significant, an appropriate wet state can be maintained.
[0012]
Since it is cured by natural drying, concrete shrinkage due to steam curing can be eliminated, fuel is not required, and it is good for the environment. In addition, by maintaining the wet state, it is possible to reliably prevent cracks in the concrete segment after the initial hardening of the concrete.
[0013]
Furthermore, water drops that fall from a water-absorbing sheet such as a curing sponge are transferred to one outside of a concrete segment and a formwork through one piece of a mesh plate such as bamboo or synthetic resin. For this reason, it is possible to prevent the surface of the cast concrete from falling and being rough (uneven) on the surface. Thereby, it can prevent reliably damaging the surface of the concrete segment smooth | blunted by surface finishing etc.
[0014]
In addition, a relatively simple and low-cost curing device consisting of a mesh board such as bamboo or synthetic resin, and a water-absorbing sheet such as sponge or nonwoven paper, produces good concrete segments without defects. be able to.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiment. FIG. 1 shows an example of a curing device used in the concrete segment curing method of the present invention. FIG. 2 shows a state where a mesh plate is installed, and FIG. 3 shows a state where a water-absorbing sheet is installed.
[0016]
As shown in FIG. 1, a mesh plate B in which bars such as bamboo material and synthetic resin material are meshed on a formwork C for manufacturing a concrete segment S so as to cover the entire upper surface of the formwork C. And it installs so that a predetermined space | interval may be hold | maintained from the convex arcuate upper surface toward the concrete segment S, and on this mesh board B, sponge material, nonwoven paper, and a nonwoven fabric with water absorption A sheet A for curing such as is installed so as to cover the mesh plate B.
[0017]
The production form C includes a pair of arc-shaped side plate molds 2 and 2 and a pair of end plate molds 3 and 3 on a circular arc-shaped bottom plate that protrudes upward from the bottom plate mold 1. The concrete segment S is manufactured by placing (flatting) concrete from above.
[0018]
The mesh plate B is formed into a plate shape by, for example, assembling rods 4 such as bamboo materials into diagonal meshes and binding the intersecting portions. The size is preferably such that the entire upper surface of the mold C is completely covered and the end portions of the bar 4 protrude slightly outward from the side plate mold 2 and the end plate mold 3. (See FIG. 2).
[0019]
Such a mesh plate B is placed on the upper end of the rising piece 3a protruding above the end plate mold 3 and on the mold spacing holder 5 provided in the center of the mold, and the mesh plate B and the concrete segment are placed. A certain distance is secured between the upper surface of the arcuate shape of S. The formwork spacing holder 5 is composed of a bar 5a spanned in parallel with the rising piece 3a of the end plate mold 3 and an attachment member 5b for attaching both ends of the bar 5a to the upper surfaces of the side plate molds 2 and 2, respectively. A pair of them are arranged in the arc direction of the formwork.
[0020]
Since the mesh plate B is flexible, as shown in FIG. 2, the mesh plate B can be along the arc of the formwork, and the mesh plate B can be fixed and positioned by the fixture 6 attached to the rising piece 3a. Prevent slippage. As the fixture 6, a clip or a vise that sandwiches the bar 4 can be used.
[0021]
As shown in FIG. 3, the water-absorbing sheet A may be of a size that can cover at least the entire arc-shaped upper surface of the concrete segment S, and is placed on the mesh plate B, and the end is fastened to the fastener 7. For example, it is fixed to the end plate mold 3.
[0022]
In the above configuration, concrete is placed in the manufacturing form C, the upper surface is smoothed by surface finishing or the like, and after the initial hardening of the concrete (depending on the season, about 2 to 2 after placing the concrete) After 3 hours), a water-absorbing sheet A is covered with the mesh plate B so as to cover the entire upper surface of the mold, and fixed with the fasteners 7.
[0023]
Evaporated moisture is caught and kept wet by the water-absorbing sheet A installed at a certain distance from the arcuate upper surface of the concrete segment S by the mold interval holder 5 and the mesh plate B. The water droplets falling from the sheet A are transferred to one of the bars 4 constituting the mesh of the mesh plate B and fall to the outside of the manufacturing form C, and onto the arcuate upper surface of the concrete segment S. Never fall.
[0024]
Needless to say, the present invention is not limited to the illustrated examples.
[0025]
【The invention's effect】
In the present invention, after placing concrete in a mold, after the initial curing of the concrete, a water-absorbing sheet is placed and fixed on the mold via a mesh plate, and the moisture retention by the mesh plate and the water-absorbing sheet is performed. Since curing by natural drying is performed in the state, the following effects are obtained.
[0026]
(1) Since it is cured by natural drying, concrete shrinkage due to steam curing can be eliminated, fuel is unnecessary, and it is good for the environment.
[0027]
(2) Water absorbing sheets such as curing sponge materials, non-woven paper, non-woven fabric, etc. provided at a predetermined distance from the concrete surface with a mesh plate to catch the evaporated water and keep it moist. By doing so, cracking of the concrete segment after the initial hardening of the concrete can be reliably prevented.
[0028]
(3) Water drops falling from a water-absorbing sheet such as a curing sponge are transferred to one outside of a concrete segment, such as bamboo and synthetic resin, and fall to the outside of the concrete segment. It is possible to prevent the surface of the cast concrete from falling and causing roughness (unevenness) on the surface, and it is possible to reliably prevent the surface of the concrete segment smoothed by surface finishing or the like from being damaged.
[0029]
(4) Produces good concrete segments without defects using a relatively simple and low-cost curing device consisting of a mesh board such as bamboo or synthetic resin, and a water-absorbing sheet such as sponge or nonwoven paper. can do.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a curing apparatus for carrying out a concrete segment curing method of the present invention.
2 is a perspective view showing a state in which a mesh plate is attached in the apparatus of FIG. 1; FIG.
FIG. 3 is a perspective view showing a state in which a water-absorbing sheet is attached in the apparatus of FIG. 1;
[Explanation of symbols]
S: Concrete segment A ... Water-absorbing sheet B ... Mesh plate C ... Manufacturing form 1 ... Bottom plate form 2 ... Side plate form 3 ... End plate form 3a ... Rising piece 4 ... Bar 5 ... Formwork spacing holder 5a ... Bar 5b ... Mounting member 6 ... Fixing tool 7 ... Fastener

Claims (2)

This is a curing method for a concrete segment manufactured by an upwardly convex arcuate segment manufacturing formwork, and after placing concrete in the segment manufacturing formwork, the length along the arc of the segment manufacturing formwork configured in partnership to mesh diagonal bars to the direction, not covering the entire formwork top, and the size of the mesh plate end of the rod member protrudes outward from the side plate mold and the end plate formwork The bar material is inclined with respect to the longitudinal direction along the arc of the segment manufacturing formwork at a predetermined distance from the upper surface of the concrete placed on the segment manufacturing formwork, and the bar material The side plate mold and the end plate mold are installed so as to protrude outward, and a water-absorbent sheet is attached on the mesh plate to cover the mesh plate, and the mesh plate and the water-absorbent sheet Curing in a moisturized state by Regimen of concrete segments, characterized in that. It is a curing equipment for concrete segments manufactured by arc-shaped segment manufacturing molds that are convex upward, and consists of mesh bars made of diagonal bars with respect to the longitudinal direction along the arcs of the segment manufacturing molds. It is, not covering the entire mold top and the size of the mesh plate end of the rod member protrudes outward from the side plate mold and the end plate mold, along bar is an arc segment manufacturing mold A predetermined distance from the upper surface of the concrete on which the mesh plate is placed so as to be inclined with respect to the longitudinal direction and so that the end of the bar protrudes outward from the side plate mold frame and the end plate mold frame . And an interval holder for holding the segment plate on the mold for manufacturing the segment, a fixture for fixing the mesh plate to the upper part of the mold for manufacturing the segment, and a water absorbing property that is attached to the mesh plate and covers the mesh plate. Sheet and this sheet Curing device of concrete segments, characterized in that it comprises a fastener for attaching the frame top.

Images