JPH0528583U - Cooling system for welded parts of precast concrete structures - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cooling device at the time of welding of a steel frame in a precast concrete structure having a small exposed portion of the steel frame and having good work efficiency. [Structure] A metal heat absorbing part 2 formed so as to adhere to a steel frame 8 of a precast concrete structure 1 to be welded is provided, and one end is embedded in the metal heat absorbing part 2 for heat transfer heat radiation. A pipe 3 is provided, a heat exchange pipe is disposed in contact with the heat pipe 3, a cooling medium is supplied to the heat exchange pipe, the cooling medium is recovered, and the heat exchange pipe is again supplied to the heat exchange pipe. Equipped with a cold water supply device 7 for supplying and circulating

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device for removing heat generated by welding when welding a steel frame of a column or a beam made of a precast concrete structure.

[0002]

[Prior Art]

 Pillars, beams, or panels made of precast concrete structures can be manufactured in advance at factories, transported, and assembled at the construction site, which simplifies work at the 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, precast concrete having a different coefficient of thermal expansion may be damaged by cracking or peeling. In order to prevent this damage, the steel frame at the welding location was exposed to a large extent to increase the distance to the precast concrete, making it difficult for heat to reach the precast concrete.

[0004]

[Problems to be solved by the device]

 However, the exposed steel frame for welding must be filled with post-cast concrete after welding and embedded in the concrete. If the exposed part of the steel frame becomes long, a complex formwork is required for this post-cast concrete, and the amount of post-cast concrete will increase, increasing the amount of work at the construction site.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a cooling device at the time of welding a steel frame in a precast concrete structure, which has a small exposed portion of the steel frame and has good work efficiency. To aim.

[0006]

[Means for Solving the Problems] The present invention has been made to achieve the above object, and has the following configuration. That is, a metal heat absorption part 2 formed so as to be in close contact with the steel frame 8 of the precast concrete structure 1 to be welded is provided, and one end is embedded in the metal heat absorption part 2 for heat transfer and heat radiation. A pipe 3 is provided, a heat exchange pipe is arranged in contact with the heat pipe 3, a cooling medium is supplied to the heat exchange pipe, the cooling medium is recovered, and the heat exchange pipe is again used. It is equipped with a cold water supply device 7 for supplying and circulating the cold water.

[0007]

[Action]

 The heat generated by the welding is conducted to the metal heat absorbing portion 2 and the heat pipe 3 which are in close contact with the exposed steel frame 8 and is also positively absorbed and radiated by the cooling medium circulating in the heat exchange pipe. Therefore, it is possible to prevent the precast concrete 9 from being damaged by the heat transmitted through the steel frame 8. Further, it is possible to lengthen the precast concrete 9 portion and shorten the exposure of the steel frame 8 portion.

[0008]

【Example】

 An 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 the beams extending from the left and right are connected at the center (FIG. 1) to perform the assembly. The steel frame 8 is exposed at the tip of each beam, and welding is performed.

The steel frame 8 is an H-shaped steel as shown in FIG. 2, and the vertical cross sections of the steel frames 8 are butted and welded together. Of the exposed portion of the steel frame 8, the metal heat absorbing portion 2 is in close contact with the portion close to the precast concrete 9. This metallic heat absorbing portion 2 is formed in a shape that is in close contact with the upper and lower surfaces or side surfaces of the H-shaped steel, which is a steel frame, and fits closely to the surface shape of the steel frame 8 in this close contact portion. Further, this is efficient if a material having excellent thermal conductivity such as a copper alloy is used.

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

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

In this embodiment, three heat pipes 3 are provided for one metal heat absorption part 2, and the outer pipes 10 of the double pipe part 4 surrounding these are connected to each other by a connection pipe 11. Joints 5 are formed on both ends of the outer pipe 10 for connecting cooling water supply hoses 6 to each other.

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

This cooling water returns to the inside of the cold water supply device 7 via the hose 6 connected to the other joint 5, and after cooling, is supplied again to the outer pipe 10 and repeatedly circulated. This cooling may be performed by allowing heat to naturally dissipate while flowing through 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, and the cooling water is supplied at the same time. Alternatively, the installation position and the number of the metal heat absorption parts 2 are appropriately selected according to the welding location, and the detachment is repeated for each outer pipe 10 in contact with the different heat pipes 3, and the cooling water is sequentially added. It is also possible to supply.

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 9, high heat is generated due to the welding. Although this heat is transmitted through the steel frame 8, it is immediately absorbed by the metal heat absorbing portion 2. The absorbed heat is conducted through the heat pipe 3 to be dissipated, and further 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 radiated.

In this way, the exposed steel frame 8 by the action of the heat pipe 3, that is, the portion to be welded is positively cooled, so that the heat of the steel frame 8 can be prevented from being transferred to the precast concrete 9, This heat prevents damage such as cracking or peeling of the precast concrete 9 caused by the difference in thermal expansion coefficient between the steel frame 8 and the precast concrete 9.

Further, since the steel frame 8 is positively cooled, it is not necessary to lengthen the exposed part of the steel frame 8 for cooling as in the conventional case, and a die for post-finishing concrete after welding is performed on the exposed part. The frame can have a small and simple structure.

Further, 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]

[Effect of the device]

 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 the heat pipe, etc., so that the exposed portion of the steel frame is transferred to the precast concrete. It can be prevented from being transmitted and the heat can prevent the precast concrete from being damaged. Therefore, the exposed portion of the steel frame can be made small, the formwork for post-cast concrete required after welding can be made small, and the work can be done efficiently at the site.

Further, since the entire apparatus is downsized as compared with the cooling apparatus using the radiation fins, the cooling fan, etc., it does not become a hindrance even in the work at high places, and the safety is secured.

[Brief description of drawings]

FIG. 1 is a side view showing a welded 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 welded portion of a precast concrete structure.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A metal heat absorption part (2) formed so as to be in close contact with a steel frame (8) of a precast concrete structure (1) to be welded, and the metal heat absorption part (2) is provided. A heat transfer heat radiating heat pipe (3) having one end embedded therein is provided, a heat exchange pipe is disposed in contact with the heat pipe (3), and a cooling medium is supplied to the heat exchange pipe. A cooling unit for a welded part of a precast concrete structure, comprising a cold water supply device (7) for collecting a cooling medium and supplying the cooling medium again to circulate the cooling medium.