JP3865660B2 - Cement-based mixed material curing device and method of using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cement-based mixed material curing device and a method of using the same, which are used for high-temperature curing for curing cement-based mixed materials such as concrete, high-strength concrete, and fiber-reinforced cement-based mixed materials.
[0002]
[Prior art]
As a curing method for curing the cement-based mixed material constituting the structure sufficiently or early, high-temperature curing is known in which heating is performed for a predetermined period on the cement-based mixed material.
For example, in a secondary product factory that manufactures a precast member made of concrete, the precast member is subjected to high temperature curing in a permanent large-scale steam curing device in order to shorten the time until the precast member is removed. There are known methods for developing strength.
[0003]
[Problems to be solved by the invention]
The above-described conventional high-temperature curing of cement-based mixed materials has the following problems.
<A> In order to reliably maintain a high temperature, it is necessary to perform a curing operation in which the entire structure including the existing structures on both sides is surrounded by a known steam curing device or the like.
In particular, when building bridges, tunnels, building outer walls, etc., a cement-based mixed material as a filling material between two concrete blocks arranged at a predetermined interval as a method of connecting concrete blocks produced in advance. Wet joint construction methods are known, but even when such partially used cement-based mixed materials are cured at high temperature, curing work using a steam curing device that can surround the entire block is required. It is.
For this reason, even when wet joints of several centimeters to several tens of centimeters are cured, a large-scale curing device is required, which is uneconomical and impractical.
<B> There are various shapes of existing structures, but there is no high-temperature curing device that can be flexibly changed according to the shape. After all, it is surrounded by a large-scale curing device. There is a need to.
<C> As a method of keeping a part of a structure made of a cement-based mixed material at a constant high temperature, a plastic material net encapsulating heat rays and a carbon fiber sheet are known. It is inappropriate to apply heat intensively to a small area. That is, the amount of heat is concentrated only in the heat ray portion, and on the other hand, heat is dissipated from the existing structure in the portion where the amount of heat is not concentrated, so that a sufficiently high temperature cannot be maintained.
<D> When the high temperature cannot be maintained, the final strength of the cement-based mixed material (wet joint) reaches a peak, and depending on the case, the strength may decrease or the strength may vary as a whole. In addition, the curing period will be longer.
[0004]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described conventional problems, and is a cement-based mixed material curing device capable of reliably applying heat necessary for high-temperature curing of a wet joint made of a cement-based mixed material, and It aims at providing the usage method.
Moreover, an object of this invention is to provide the curing device of the cement-type mixed material which prevents the spreading | diffusion of the provided heat | fever, and its usage method.
Furthermore, an object of this invention is to provide the curing device of the cement-type mixed material in which local high temperature curing is possible, and its usage method.
The present invention achieves at least one of these objects.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the cement-based mixed material curing device of the present invention is a cement-based mixed material curing device for high-temperature curing of a cement-based mixed material disposed at a joint between existing structures. A flexible tube that contacts and surrounds the cementitious mixed material and the ends of the existing structure located on both sides of the cemented mixed material , and a heat medium in the flexible tube. A heat medium circulation supply device for circulation , and the high temperature curing of the cement-based mixed material and the ends of the existing structures located on both sides of the cement-based mixed material by the heat medium circulating in the flexible pipe body. It is characterized by doing.
Here, “high-temperature curing” refers to curing of a cement-based mixed material at a high temperature, and refers to a known high-temperature curing that can quickly develop strength when the cement-based mixed material is cured.
The “heat medium” is a medium for applying high-temperature heat to the cementitious mixed material, and circulates in the flexible tube. For example, a known fluid medium such as water, steam, or oil is used. Is preferred.
[0006]
The cement-based mixed material curing device according to the present invention includes a heat-insulating mat covering a flexible tubular body surrounded by the cement-based mixed material and ends of existing structures located on both sides of the cement-based mixed material. It is characterized by using.
Here, the “heat-insulating mat” refers to a known heat-insulating mat made of a material such as urethane, glass wool, or ceramic, and is capable of covering the flexible tubular body even in a form other than the mat shape. Can be used.
[0007]
Furthermore, the curing device for cement-based mixed material of the present invention is characterized in that a heat conduction base is interposed between the flexible tube and the cement-based mixed material.
[0008]
The method for using the cement-based mixed material curing device of the present invention is a method of using the cement-based mixed material curing device described above for curing a cement-based mixed material disposed at a joint between existing structures. The flexible tube is disposed so as to cover the joint, and the heat medium heated by the heat medium circulation feeder is circulated in the flexible tube, and the cement-based mixed material of the joint and the cement The present invention is characterized in that the ends of the existing structure located on both sides of the system mixed material are subjected to high heat curing.
[0009]
In addition, the method of using the cement-based mixed material curing device of the present invention is a method of using the cement-based mixed material curing device described above for curing the cement-based mixed material disposed at the joint between existing structures. A heat conduction pedestal is disposed so as to cover the joint, a heat medium heated by a heat medium circulation feeder is circulated in the flexible tube, and the cement system of the joint via the heat conduction pedestal The mixed material and the ends of the existing structure located on both sides of the cement-based mixed material are cured at a high temperature.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0011]
<A> Cement-based mixed material curing device The cement-based mixed material curing device 1 of the present invention is an existing structure, for example, a cement-based mixed material disposed at a joint 20 when segments 2 and 2 are joined together. An example suitable for high-temperature curing of the wet joint 3 filled with is described. Here, the wet joint refers to a joint portion that requires curing.
As shown in FIG. 1, the cement-based mixed material curing device 1 includes a flexible tube 10 disposed at a joint 20 between segments 2 and 2 and a heat medium circulation supply device 11.
With this structure, the cement-based mixed material curing device 1 can reliably perform the high-temperature curing of the wet joint 3 disposed locally, for example, with a narrow width, without waste.
In this example, an example in which the flexible tube 10 is covered with the heat-resistant mat 12 will be described in order to prevent heat from diffusing from the flexible tube 10.
At this time, examples of the cement-based mixed material constituting the wet joint 3 include known concrete, high-strength concrete, fiber-reinforced cement-based mixed material, and the like.
Examples of the fiber-reinforced cement-based mixed material include cement, pozzolanic fine powder and silica stone powder, silica fume, silica sand having a particle size of 3 mm or less, high-performance water reducing agent, and water as a unit water volume (per 1 m ³ concrete volume). About 180 kg (water / cement ratio is about 20-22%) added to a high-strength cement matrix, the diameter is 0.1-0.3 mm, the length is 8-16 mm, and the tensile yield stress is 2600. ~2800N / mm ² compressive strength 200~220MPa obtained by mixing about 2% of steel fibers in a volume of ultra-high strength, flexural strength 40～45MPa, adhesion strength 15～90MPa, permeability coefficient 2.5 × 10 ^{- 18} m ^2, water absorption 0.05 kg / m ^3, salinity diffusion coefficient ^{0.02 × 10 - 12 m 2 /} sec, the fibers complement with the characteristics of elastic modulus 55GPa Strong cement-based mixed materials can be used.
Hereinafter, main parts of the cement-based mixed material curing device 1 will be described.
[0012]
<B> Flexible tube The flexible tube 10 is an annular shape for circulating a heat medium using a heat medium circulation supply device 11 described later and maintaining the periphery of the flexible tube 10 at a high temperature. It is a tube.
The flexible tubular body 10 is positioned so as to cover the joint 20 which is between the wet joint 3 and the ends of the segments 2 and 2, and heat is applied to these to maintain a high temperature. Here, the joint portion 20 refers to the end portions of the segments 2 and 2 and the wet joint 3 as shown in FIG. At this time, the flexible tube 10 has a flat cross section in order to ensure a wide contact area with the joint 20 and the wet joint 3.
The flexible tubular body 10 can follow the unevenness of the wet joint 3 by being flexible, and can be bent flexibly when the wet joint 3 is surrounded.
The flexible tube 10 has a supply path 10a connected to a supply port of a heat medium circulation supply device 11 described later at one end, and a recovery path 10b connected to a recovery port at the other end. The heat medium is circulated by the heat medium circulation supply unit 11.
The flexible tube 10 is a tube made of a known resin such as a rubber tube, for example, and has flexibility, and at the same time, does not cause deformation or dissolution due to a high temperature transmitted from a heat medium. Has properties.
In addition, the flexible tube 10 is disposed so as to surround the joint portion 20 by a plurality of pressing members 13 which are known metal fittings or the like spanning between the segments 2 and 2. The presser 13 is fixed to the segments 2 and 2 by, for example, a known bolt 14 fastening.
[0013]
<C> Heat medium circulation supply device The heat medium circulation supply device 11 has a function for heating and supplying the heat medium circulating in the flexible tube 10 described above.
The heat medium circulation supply device 11 includes a known heating means for heating the heat medium and known equipment such as a pump means for circulating the heat medium.
The heat medium circulation supply unit 11 has a supply port connected to the supply path 10 a of the flexible tube 10 and a recovery port connected to the recovery path 10 b of the flexible tube 10.
As the heat medium, a known fluid medium that can be heated, such as water, steam, or oil, is used, and the medium can be circulated in the flexible tube 10.
[0014]
<D> Heat insulating mat The heat insulating mat 12 is a member for preventing the heat of the heat medium circulating in the flexible tubular body 10 from being diffused during the circulation.
As the heat insulating mat 12, a known heat insulating material such as urethane, glass wool, ceramic or the like can be used. Moreover, the form which can cover the flexible tubular body 10 can be freely selected without being limited to the mat shape.
The heat insulating mat 12 should be omitted if the desired heat insulating performance can be obtained by manufacturing the flexible tubular body 10 itself with a heat insulating material or by applying a heat insulating coating in advance to a portion that comes into contact with the outside air. You can also.
[0015]
A method of using the cement-based mixed material curing device of the present invention will be described below with reference to FIGS.
[0016]
<A> When another segment 2 is joined to the arrangement segment 2 of the flexible tube, a wet joint 3 made of a cement-based mixed material is constructed between the segments 2 and 2.
After the construction of the wet joint 3, the flexible tubular body 10 is surrounded along the joint 20 between the segments 2 and 2 so as to cover the joint 20.
At this time, the flexible tube 10 covers the joint portion 20 as shown in FIG. 2 when the flexible tube 10 is on the wet joint 3 and the ends of the segments 2 and 2 located on both sides thereof. It refers to disposing to hang.
The flexible tube 10 has a supply path 10a and a discharge path 10b, and is connected to a heat medium circulation supply device 11 described later.
Furthermore, the flexible tube 10 is covered with a heat insulating mat 12 over its entire length so that the heat of the heat medium circulating inside does not diverge.
[0017]
<B> Heat medium circulation wet joint 3 and heat medium circulation supply device 11 connected to flexible tube 10 arranged so as to surround joint portion 20 consisting of the ends of segments 2 and 2 are flexible. A heat medium is circulated in the sex tube 10.
The heat medium is heated by the heating means in the heat medium circulation supply device 11 until it reaches a temperature necessary for high temperature curing.
The heat medium that has reached the temperature required for high-temperature curing is sent out from the supply port to the supply path 10 a by the pump in the heat medium circulation supply device 11 and circulates in the flexible tube 10.
[0018]
<C> The heat medium circulating in the high-temperature-curing flexible tube 10 of the cement-based mixed material decreases in temperature when it goes around the flexible tube 10, and becomes lower than the temperature required for high-temperature curing, It is heated again in the heat medium circulation supply device 11 to a temperature necessary for high-temperature curing, and sent again to the flexible tube 10 from the supply port.
By repeating this operation, the inside of the flexible tubular body 10 is always set to a high temperature curing temperature, and the joint 20 including the wet joint 3 is always set to a high temperature necessary for curing.
Thereby, since the wet joint 3 hardens | cures while expressing intensity | strength at an early stage, it can shorten a curing period.
[0019]
Second Embodiment of the Invention
In Embodiment 1 of the present invention, as an example of a cement-based mixed material curing device 1, an example in which a flexible tube 10 and a heat medium circulation feeder 11 are used as main parts and a heat insulating mat 12 is used. Explains.
On the other hand, as shown in FIG. 3, between the flexible tube 10 and the wet joint 3 made of a cement-based mixed material, a heat conduction base 15 that holds the flexible tube 10 is provided on one side surface. It can also be configured.
[0020]
As shown in FIG. 4, the heat conduction pedestal 15 is divided into a plurality of pieces 15a, and these pieces 15a are used in combination so as to match the size and shape of the arrangement position.
On one side surface of each piece 15a, there is an accommodating portion 15b having a substantially C-shaped cross section for accommodating the flexible tubular body 10. It is preferable that the accommodating portion 15b has a shape that can keep heat radiated from the flexible tube 10 to a minimum while making the detachability of the flexible tube 10 good. Moreover, in order to prevent the heat from diffusing from the flexible tubular body 10, the heat insulating mat 12 or the like used in the first embodiment of the invention may be used.
Between the connections of the pieces 15a, there is a connecting portion 15c that is combined with each other to form one cylindrical shape, and has a simple joint structure that is fixed with a nut 15e through a long bolt 15d. With this joint structure, the connecting position of the pieces 15a can be bent and removed, and the group of pieces 15a covers the wet joint 3 like a caterpillar.
The heat conduction base 15 is preferably made of a known material having a high heat conductivity such as metal. Further, the heat conduction pedestal 15 is attached across the segments 2 and 2 with bolts 14 or the like.
As a result, the wet joint 3 made of a cement-based mixed material conducts heat from the heat medium circulating in the flexible tube 10 to the heat conduction pedestal 15, and the periphery of the joint 20 between the segments 2 and 2 is heated to Can be Moreover, since the other side surface of the heat conduction base 15 protects the wet joint 3, the wet joint 3 is unlikely to be deformed.
[0021]
【The invention's effect】
Since the curing device for cement-based mixed material and the method of using the same according to the present invention are as described above, the following effects can be obtained.
<I> Cement-based mixed materials such as wet joints are always kept at a high temperature and can be reliably cured at a high temperature.
<B> Since high temperature is imparted to the existing structure together with the wet joint, heat is hardly dissipated through the existing structures on both sides. Thereby, the high temperature required for curing can be maintained.
<C> Reliable high-temperature curing is possible even locally, such as between members.
The wet joint is surrounded and heat can be applied to the existing structure around the wet joint to maintain a high temperature, and a large-scale curing device that accommodates the entire existing structure is not required. That is, sufficient high-temperature curing can be performed only on necessary portions.
For this reason, even in partial high temperature curing, it is economical and realistic.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cement-based mixed material curing device of the present invention. FIG. 2 is a cross-sectional view of a flexible tube according to a first embodiment of the invention. FIG. 3 is a heat according to a second embodiment of the invention. Cross-sectional view of a flexible tube disposed through a conductive pedestal.
DESCRIPTION OF SYMBOLS 1 ... Cement-type mixed material curing device 10 ... Flexible tube 11 ... Heat-medium circulation supply device 12 ... Thermal insulation mat 2 ... Segment 20 ... Joint part

Claims (5)

A cement-based mixed material curing device for curing a cement-based mixed material disposed at a joint between existing structures at a high temperature,
A flexible tube that contacts and surrounds the cementitious mixed material and the ends of the existing structure located on both sides of the cemented mixed material ;
A heat medium circulation feeder that circulates the heat medium in the flexible tube,
The cement-based mixed material and the ends of the existing structures located on both sides of the cement-based mixed material are cured at a high temperature by a heat medium circulating in the flexible pipe body,
Curing equipment for cement-based mixed materials. The heat insulating mat that covers the flexible tubular body surrounded by the cement-based mixed material and ends of existing structures located on both sides of the cement-based mixed material is used. Curing equipment for cement-based mixed materials.   2. The cement-based mixed material curing device according to claim 1, wherein a heat conduction pedestal is interposed between the flexible tube and the cement-based mixed material. A method of using the cement-based mixed material curing device according to claim 1 or 2 for curing a cement-based mixed material disposed at a joint between existing structures, wherein the joint between the existing structures A flexible tube is arranged so as to cover the heat medium, and the heat medium heated by the heat medium circulation feeder is circulated in the flexible tube , and the cement-based mixed material of the joint and the cement-based mixed material A method of using a cement-based mixed material curing device, characterized in that the ends of existing structures located on both sides are subjected to high-temperature curing. The method of using the cement-based mixed material curing device according to claim 3 for curing a cement-based mixed material disposed at a joint between existing structures, wherein the joint between the existing structures is covered. thermal conduction base is disposed, the heat medium heated by the heat medium circulating feeder is circulated in a flexible tube body, the cementitious mix materials of the joining portion via the heat conducting base, the cement as A method for using a cement-based mixed material curing device, characterized in that the ends of existing structures located on both sides of the mixed material are subjected to high-temperature curing.

Images