JP2546157Y2 - Precast concrete structure - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is based on the precast concrete
Regarding reed structures, more specifically, when installing precast concrete structures,
Equipped with a cooling device that actively removes the heat generated by welding when welding steel frames protruding from the main structure
It relates to a precast concrete structure .

[0002]

2. Description of the Related Art Columns, beams or panels made of precast concrete structures are manufactured in advance in factories and the like.
Work at the site is simplified because it can be transported and assembled at the construction site. During this assembly, the steel frame of the precast concrete structure is welded to secure the strength of the entire structure after assembly.

However, if the steel frame is strongly heated during this welding, there is a possibility that the precast concrete having a different coefficient of thermal expansion may be damaged by the steel frame such as cracking or peeling. In order to prevent this damage, the steel frame at the welding point was largely exposed, the distance to the precast concrete was increased, and heat was hardly transmitted to the precast concrete portion.

[0004]

However, the steel frame exposed for welding must be filled with post-cast concrete and buried in the concrete after welding. When the exposed portion of the steel frame becomes long, a formwork having a complicated shape is required for the post-cast concrete, and the amount of the post-cast concrete increases, so that the amount of work at the construction site increases.

[0005] This invention is made to solve the above-mentioned problems, and shortens the exposed portion of the steel frame to reduce the welding.
Improving the efficiency of post-concrete post-welding work
It is an object of the present invention to provide a precast concrete structure that can be used .

[0006]

The present invention has been made to achieve the above object, and has the following configuration. That is, in this invention, the steel frame 8 is buried inside.
From the precast concrete structure body
8 is a protruding precast concrete structure
Te, protruding from the precast concrete structure body
A metallic heat absorbing portion 2 which is shaped so as to be in close contact with the projecting portion of the steel frame 8 is provided with, provided a heat pipe 3 for heat transfer radiator embedded at one end to the metal heat absorbing portion 2, the heat pipe A cooling water supply device for supplying a cooling medium to the heat exchange tube, recovering the cooling medium, supplying the cooling medium again to the heat exchange tube, and circulating the heat exchange tube; characterized in that it comprises 7.

[0007]

[Function] The heat generated by welding is applied to the exposed steel frame 8.
The heat is conducted to the metal heat absorbing portion 2 and the heat pipe 3 which are in close contact with the heat pipe, and is positively absorbed and radiated by the cooling medium circulating in the heat exchange tube. Therefore, it is possible to prevent the precast concrete 9 from being damaged by heat transmitted through the steel frame 8. The length of the precast concrete 9 can be increased, and the exposure of the steel frame 8 can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The precast concrete structure 1 in this embodiment is a beam, and beams extending from left and right are connected at the center (FIG. 1) and assembled. At the tip of each beam , inside the precast concrete structure body 9
The steel frame 8 buried in the part projects from the structure body 9 to the outside.
It is exposed and welded.

The steel frame 8 is an H-shaped steel as shown in FIG. 2, and its vertical sections are welded together. The metal heat absorbing portion 2 is in close contact with a portion of the exposed portion of the steel frame 8 close to the precast concrete structure main body 9. The metal heat absorbing portion 2 is formed in such a shape as to be in close contact with the upper and lower surfaces or side surfaces of the H-shaped steel, which is a steel frame, and to fit exactly into the surface shape of the steel frame 8 at the close contact portion. For example, if a material having excellent thermal conductivity such as a copper alloy is used, the efficiency is high.

Although not shown, the metal heat absorbing portion 2 is fixed to the steel frame 8 by, for example, sandwiching it with a metal clamper or performing temporary welding. Alternatively, when welding is performed on the upper surface of an H-shaped steel, which is iron or steel, it may be simply placed on the upper surface.

In this embodiment, metal heat absorbing portions 2 are formed on the upper and lower surfaces of the H-shaped steel, and one end of a plurality of heat pipes 3 is embedded in the metal heat absorbing portions 2. The other end of the heat pipe 3 becomes a double pipe section 4 and the heat pipe 3
Is disposed inside as an inner tube, and an outer tube 10 acting as a heat exchange tube is disposed so as to contact the outer periphery thereof.

In this embodiment, three heat pipes 3 are provided for one metal heat absorbing section 2 and the outer pipes 10 of the double pipe section 4 surrounding these are connected to each other by a connecting pipe 11. A joint 5 for connecting a cooling water supply hose 6 is formed at both ends of the outer tube 10.

Further, a cooling water supply device 7 is provided, which supplies cooling water to the outer pipe 10 via a hose 6 connected to the joint 5. The cooling water flowing into the outer pipe 10 from the hose 6 connected to the one joint 5 flows through the outer pipe 10 and absorbs heat from the heat pipe 3.

The cooling water returns to the cooling water supply device 7 via the hose 6 connected to the other joint 5, and after cooling, again.
It is supplied to the outer tube 10 and circulates repeatedly. This cooling
Heat may be naturally dissipated while flowing in the hose 6, or a cooling device may be mounted in the cold water supply device 7 to perform forced cooling.

Further, a plurality of cold water supply devices 7 are provided, and these are connected to all the outer pipes 10 via the hoses 6 to simultaneously supply the cooling water. Alternatively, the installation position and number of the metal heat absorbing sections 2 are appropriately selected according to the welding location, and the attachment and detachment are repeated for each of the outer pipes 10 in contact with the different heat pipes 3 so that the cooling water is supplied sequentially. It is also possible.

The operation of this embodiment will be described below. When welding is performed at the tip of the steel frame 8 exposed from the precast concrete structure main body 9, high heat accompanying the welding is generated. This heat is transmitted through the steel frame 8 but is immediately absorbed by the metal heat absorbing portion 2. The absorbed heat is dissipated through the heat pipe 3 and reaches the double pipe section 4. At this time, if cooling water is supplied into the outer pipe 10, the heat of the heat pipe 3 is absorbed by the cooling water and is radiated.

In this way, the steel frame 8 exposed by the action of the heat pipe 3, ie, the portion to be welded, is actively cooled, so that the heat of the steel frame 8 can be prevented from being transmitted to the precast concrete structure main body 9. Conventionally, this heat causes the steel frame 8 and the precast concrete structure
Damage such as cracking or peeling of the precast concrete structure body 9 the difference in coefficient of thermal expansion of the body 9 has occurred caused can be prevented.

Further, since the steel frame 8 is actively cooled,
Unlike the conventional case, it is not necessary to lengthen the exposed portion of the steel frame 8 for cooling, and the post-cast concrete formwork after welding performed on the exposed portion can have a small and simple structure.

Furthermore, since the formwork is small, the amount of post-cast concrete is reduced, and the work efficiency at the assembly site of the precast concrete structure 1 can be improved.

[0020]

As described above, according to the present invention, the heat generated during welding is positively absorbed by the cooling medium from the exposed portion of the steel frame through a heat pipe or the like. From precast concrete structure
Transmission to the structure body can be suppressed, and damage to the precast concrete due to heat can be suppressed. Therefore, the exposed portion of the steel frame can be made small, and the formwork for post-cast concrete required after welding can be made small and simple in shape, which has the effect of making work on site more efficient.

Further, the size of the entire device is smaller than that of a cooling device using a radiating fin, a cooling fan, or the like.

[Brief description of the drawings]

FIG. 1 is a side view showing a welding portion of a precast concrete structure in a cooling device according to an embodiment of the present invention.

FIG. 2 is a front view showing a welding portion of a precast concrete structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete structure 2 Metal heat absorption part 3 Heat pipe 7 Cold water supply device

Claims (1)

(57) [Scope of request for utility model registration] 1. A pre-car having a steel frame (8) embedded therein.
The steel frame (8) protrudes from the main body of the struck concrete structure
And a metal heat absorbing portion formed so as to be in close contact with a protruding portion of the steel frame (8) protruding from the precast concrete structure main body. (2) is provided, a heat pipe (3) for heat transfer and heat radiation having one end embedded in the metal heat absorbing portion (2) is provided, and a heat exchange tube is provided in contact with the heat pipe (3). And a cooling water supply device (7) for supplying a cooling medium to the heat exchange tube, recovering the cooling medium, supplying the cooling medium again to the heat exchange tube and circulating the same. Precast concrete structure.