JP7551101B2 - Construction method and transport platform used therein - Google Patents

Description

The present invention relates to a construction method for installing refrigerant piping for air conditioning on the roof of a building and a transport platform used for the method.

The outdoor unit of an air conditioning system is often installed on the roof of a building. At a construction site, when the outdoor unit is installed on the roof, multiple refrigerant pipes are laid to circulate the refrigerant from the outdoor unit to the heat exchange units on each floor.

Conventionally, refrigerant piping ducts have been used to lay refrigerant piping on the roofs of buildings (for example, Patent Documents 1 and 2). The refrigerant piping duct of Patent Document 1 has a support member in which the upper parts of a pair of parallel legs are connected to each other by a horizontal plate portion, and is formed by arranging a pair of side wall members facing each other at a predetermined interval on the upper surface side of the horizontal plate portion of the support member. In this refrigerant piping duct, multiple refrigerant pipes are arranged in a storage space inside the pair of side wall members. These multiple refrigerant pipes are supported by the horizontal plate portion of the support member that crosses the lower part of the pair of side wall members, and are held inside the pair of side wall members. After the multiple refrigerant pipes are arranged in the storage space, a canopy is attached to the refrigerant piping duct so as to cover the upper opening of the pair of side wall members. The canopy is intended to prevent rainwater and the like from entering the storage space. This type of refrigerant piping duct supports the refrigerant piping in a state where it is elevated above the rooftop structural surface (floor surface), so the refrigerant piping can be protected from flooding even if rainwater or other water flows over the structural surface.

JP 2016-11706 A JP 2013-164140 A

In the conventional construction method for refrigerant piping ducts as described above, first the legs of the support member are fixed to the structural surface (floor surface) of the building roof using anchors or the like, and then a pair of side wall members are attached to the upper surface of the horizontal plate portion of the support member. In other words, the work of installing the refrigerant piping duct on the building roof is carried out first. Refrigerant piping ducts are rarely arranged in a straight line from the outdoor unit in the rooftop space, and are usually arranged in a curved manner to avoid various obstacles installed on the roof. Then, after the refrigerant piping duct is installed on the roof, refrigerant piping for guiding the refrigerant to each floor is arranged in the storage space inside the pair of side wall members.

The refrigerant pipes are brought to the work site, the rooftop of a building, as straight pipes of a specified length. This means that workers must bend each straight refrigerant pipe as necessary and place them in an aligned state inside a pair of side wall members, which is not an efficient way to work. In addition, when connecting multiple refrigerant pipes, a skilled worker must braze each pipe, and the longer the length of the refrigerant pipe duct to be installed, the longer the construction time.

On the other hand, at new construction sites such as large buildings, the amount of man-hours required to install refrigerant piping in the roof space is set according to the scheduled completion date. Usually, there is not much leeway in this amount of man-hours, and delays in work can lead to liability issues, placing a heavy burden on workers.

In light of the above circumstances, there has been a demand in recent years for improvements in the efficiency of installing refrigerant piping in rooftop spaces, and in particular for a reduction in the amount of work required on the roofs of buildings.

The present invention was made to solve the above-mentioned problems, and aims to provide a construction method and a transport platform for use therein that reduce the amount of work required on the roof when installing refrigerant piping on the roof of a building and allow the work to be carried out efficiently.

In order to achieve the above object, firstly, the present invention provides a construction method for installing air-conditioning refrigerant piping on the roof of a building, comprising a first step of preparing, in a factory, a support member having upper parts of a pair of parallel legs connected to each other by a horizontal connecting part , and arranging a pair of side wall members facing each other at a predetermined interval on an upper surface side of the connecting part to form a refrigerant piping duct of a predetermined length and a predetermined shape; a second step of arranging, in the factory, a plurality of refrigerant pipes processed to fit the length and shape of the refrigerant piping duct in an accommodation space sandwiched between the pair of side wall members; and a second step of preparing a stand having a width dimension smaller than the interval between the pair of legs, the stand having a plurality of holding parts arranged at predetermined intervals in the vertical direction and arranged between the pair of legs to hold undersides of the connecting parts , the second step of arranging the plurality of holding parts at predetermined intervals in the vertical direction. a third step of arranging the refrigerant piping duct, in which the plurality of refrigerant pipes are arranged, within the storage space for each of the plurality of holding parts, and holding the plurality of refrigerant piping ducts by the rack with the pair of legs hanging down from both sides in the width direction of each of the plurality of holding parts; a fourth step of loading the rack holding the plurality of refrigerant piping ducts onto the bed of a transport vehicle and transporting it from the factory to a construction site of the building; a fifth step of hoisting the rack at the construction site with a crane and transporting the refrigerant piping duct to the roof of the building; and a sixth step of installing each of the plurality of refrigerant piping ducts at a predetermined position on the roof of the building, and connecting the plurality of refrigerant pipes housed in each of the plurality of refrigerant piping ducts.

Secondly, the present invention is characterized in that in the first construction method, the second step includes a step of attaching a canopy that covers the upper openings of the pair of side wall members after arranging the plurality of refrigerant pipes in the storage space.

Thirdly, the present invention is characterized in that in the first or second construction method, the frame is capable of separating each of the multiple holding parts, and the fifth step involves using the crane to lift each of the multiple holding parts in turn from the top, thereby transporting the multiple refrigerant piping ducts one by one in sequence to the roof of the building.

Fourthly, the present invention is characterized in that in any one of the first to third construction methods described above, the refrigerant piping duct formed in the first step has a bent portion, and the second step includes a step of bending the refrigerant piping to fit the bent portion of the refrigerant piping duct.

Fifth, the present invention is characterized in that in any one of the first to fourth construction methods described above, the second step includes a step of connecting multiple refrigerant pipes according to the length of the refrigerant piping duct.

Sixth, the present invention provides a transportation platform for transporting a refrigerant piping duct, the transportation platform having a support member in which upper parts of a pair of parallel legs are connected to each other by a horizontal connecting part , and a pair of side wall members standing at a predetermined interval on an upper surface side of the connecting part of the support member , and in which a plurality of refrigerant pipes have been arranged in a storage space sandwiched between the pair of side wall members, the transportation platform having a width dimension smaller than the interval between the pair of legs, and a plurality of holding parts arranged between the pair of legs and holding an underside of the connecting part , the plurality of refrigerant piping ducts can be transported simultaneously by holding the refrigerant piping ducts with each holding part, the plurality of holding parts being arranged at predetermined intervals in the vertical direction and holding the plurality of refrigerant piping ducts without interfering with each other, and each holding part holding the underside of the connecting part, the refrigerant piping duct being held with the pair of legs hanging down on both sides in the width direction .

Seventh, the present invention provides a transport platform having the sixth configuration described above, further comprising a plurality of support posts arranged at the vertices of a rectangle in plan view, and connecting members connecting the plurality of support posts to each other, and the plurality of holding parts are detachable at positions spaced apart by a predetermined distance in the vertical direction of the support posts.

Eighth, the present invention is a transport platform having the seventh configuration, characterized in that the connecting member is detachable from the multiple support columns.

The present invention makes it possible to reduce the amount of work required on the roof of a building when installing refrigerant piping, allowing work on the roof to be carried out more efficiently.

FIG. 1 is a diagram showing an example of a construction state of refrigerant piping installed on the roof of a building. 1A to 1C are diagrams showing the steps of a construction method for installing air conditioning refrigerant piping on the roof of a building. FIG. 4 is a diagram showing a refrigerant piping duct formed in a first step. 4 is a front view of the refrigerant piping duct with a pair of side wall members attached to a support member. FIG. 13 is a diagram showing a refrigerant piping duct in which a refrigerant piping is arranged in a second step. FIG. FIG. 1 is a diagram showing a refrigerant piping duct having a bent portion. 11A to 11C are diagrams illustrating an example of a connecting process for connecting two refrigerant pipes. FIG. 2 is a diagram showing an example of a configuration of a stand. FIG. 13 is a diagram showing an example in which a plurality of refrigerant piping ducts are arranged on a rack. FIG. 13 is a diagram showing an example of a transportation state of the stand.

Below, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that in the drawings referred to below, the same reference numerals are used to designate common members, and redundant descriptions of those members will be omitted.

Figure 1 is a diagram showing an example of the construction state of refrigerant piping 20 installed on the roof of a building. As shown in Figure 1, the refrigerant piping 20 is installed on the roof of a building in a state where it is held by a refrigerant piping duct 10. The refrigerant piping duct 10 is configured with a pair of legs 11, a roughly U-shaped support member 13 with the upper parts of the pair of legs 11 connected to each other, a pair of side wall members 14, 15 attached to the support member 13, and a canopy 17 attached to the upper parts of the pair of side wall members 14, 15. The support member 13 has a pair of legs fixed to the structural surface (floor surface) of the roof of the building by anchors or the like, and supports multiple refrigerant pipes 20 at a predetermined height position above the structural surface. The pair of side wall members 14, 15 are covers for covering the sides of the multiple refrigerant pipes 20 supported by the support member 13. The canopy 17 covers the upper openings of the pair of side wall members 14, 15 to prevent rainwater and the like from entering the storage space in which the multiple refrigerant pipes 20 are arranged. The refrigerant pipe duct 10 having this configuration is installed in the section from the outdoor unit of the air conditioning system installed on the roof of the building to the openings leading to each floor, and prevents the refrigerant pipes 20 from being exposed to direct sunlight and wind and rain.

Refrigerant piping ducts 10 installed on the rooftop are rarely installed in a straight line from the outdoor unit to the openings leading to each floor, and their installation length varies. For this reason, refrigerant piping ducts 10 are provided with bent sections 19 or their installation length is adjusted by connecting multiple ducts 10a, 10b, 10c, 10d, and 10e as shown in FIG. 1. In the example shown in FIG. 1, ducts 10a, 10c, and 10e are ducts that route refrigerant piping 20 in a straight line, and ducts 10b and 10d are ducts that bend the path of refrigerant piping 20 by 90 degrees.

The refrigerant pipes 20 arranged inside the refrigerant piping duct 10 are bent to fit the shape of the refrigerant piping duct 10 as described above, and multiple refrigerant pipes 20 are connected to each other to fit the length of the refrigerant piping duct 10. However, if such processing work is performed on the roof of a building as in the past, the work efficiency is poor. Therefore, in this embodiment, the work performed on the roof of a building is minimized.

Figure 2 is a diagram showing each step of the construction method for installing air-conditioning refrigerant piping 20 on the roof of a building in this embodiment. The construction method in this embodiment has six steps, from the first step ST1 to the sixth step ST6. Each of these steps will be described in detail below.

The first step ST1 is a step that is performed not at the building construction site but in a factory, in which a pair of side wall members 14, 15 are arranged facing each other at a predetermined distance on the upper surface of a support member 13 having a pair of parallel legs 11 connected at their upper parts to form a refrigerant piping duct 10 of a predetermined length and shape.

Figure 3 shows the refrigerant piping duct 10 formed in the first step ST1. In the first step ST1, as shown in Figure 3 (a), a work of attaching a pair of side wall members 14, 15 to a support member 13 is performed in a factory. The support member 13 is a roughly U-shaped metal member in which the upper parts of a pair of legs 11, 11 are connected by a roughly horizontal connecting part 12. For example, the support member 13 is formed by bending a metal plate such as a stainless steel plate or a zinc-plated copper plate with a thickness of about 2 mm. The pair of side wall members 14, 15 are formed by bending a metal plate such as a zinc-plated copper plate with a thickness of about 1 to 2 mm. The pair of side wall members 14, 15 are arranged on the roughly horizontal connecting part 12 so as to face each other with a predetermined distance between them on the upper surface side, and are attached to the connecting part 12 using screws or the like.

Figure 4 is a front view of the refrigerant piping duct 10 with a pair of sidewall members 14, 15 attached to the support member 13. In the first step ST1, the pair of sidewall members 14, 15 are attached to the connecting portion 12 of the support member 13 as shown in Figure 4. That is, the pair of sidewall members 14, 15 are attached in an upright state so as to face each other near both ends of the connecting portion 12 of the support member 13. As shown in Figure 4, the distance between the pair of legs 11 of the support member 13 is W1. When the pair of sidewall members 14, 15 are attached to the connecting portion 12 of the support member 13 in this way, an accommodation space 16 for accommodating the refrigerant piping 20 is formed between the pair of sidewall members 14, 15.

Next, the second process ST2 is a process of arranging multiple refrigerant pipes 20 that have been processed to fit the length and shape of the refrigerant piping duct 10 in the storage space 16 between a pair of side wall members 14, 15 of the refrigerant piping duct 10 in the factory.

Figure 5 is a diagram showing the refrigerant piping duct 10 in which the refrigerant piping 20 is arranged in the second step ST2. In the second step ST2, as shown in Figure 5 (a), a plurality of refrigerant piping 20 is arranged in the storage space 16 of the refrigerant piping duct 10 in a factory. As shown in Figure 5 (b), these plurality of refrigerant piping 20 are supported by the connecting portion 12 of the support member 13 that crosses the lower part of the pair of side wall members 14, 15. The number of refrigerant piping 20 arranged in the storage space 16 varies depending on the scale of the building. For example, the larger the scale of the building, the more the number of refrigerant piping 20 arranged in the storage space 16 increases, and the work time for arranging the refrigerant piping 20 becomes longer. Therefore, there is an advantage that the work to be done at the construction site can be reduced by forming the refrigerant piping duct 10 in the factory in the first step ST1, and then arranging the refrigerant piping 20 in advance in the storage space 16 inside the refrigerant piping duct 10 in the second step ST2.

In the second step ST2, for example, the straight duct 10a and the bent duct 10b are connected to each other to form a refrigerant piping duct 10 having a bent portion 19, and it is preferable to arrange a plurality of refrigerant pipes 20 in the refrigerant piping duct 10. FIG. 6 is a diagram showing a refrigerant piping duct 10 having a bent portion 19. When arranging the refrigerant piping 20 in the refrigerant piping duct 10 having the bent portion 19, it is necessary to bend the refrigerant piping 20 according to the angle of the bent portion 19. Therefore, the second step ST2 includes a step of bending the refrigerant piping 20 so that it fits the bent portion 19 of the refrigerant piping duct 10. The work of bending the refrigerant piping 20 according to the bent angle of the refrigerant piping duct 10 requires a certain degree of skill. Therefore, by performing the bending process on the refrigerant piping 20 in advance at a factory and arranging it inside the refrigerant piping duct 10 having the bent portion 19, the work to be done at the construction site can be reduced.

The second step ST2 also includes a connection step of connecting multiple refrigerant pipes 20 in series according to the length of the refrigerant pipe duct 10. FIG. 7 is a diagram showing an example of a connection step of connecting two refrigerant pipes 20a, 20b. As shown in FIG. 7(a), the refrigerant pipes 20a, 20b have metal pipes 21a, 21b made of copper pipes or the like, and insulating materials 22a, 22b covering the outer circumferential surfaces of the metal pipes 21a, 21b. The insulating materials 22a, 22b are flexible members made of, for example, polyethylene foam. When these two refrigerant pipes 20a, 20b are connected, the metal pipes 21a, 21b are connected by a connection method such as brazing. At this time, the two metal pipes 21a, 21b may be connected using a joint or the like. When the two metal pipes 21a, 21b are connected, as shown in FIG. 7(b), an insulating member 23 made of polyethylene foam or the like is wrapped around the connection portion 20c. This insulating member 23 ensures the insulating performance of the connection part 20c. The work of connecting the two refrigerant pipes 20a, 20b to each other in this way requires a certain degree of skill. Therefore, when arranging the refrigerant pipes 20 inside the refrigerant pipe duct 10, if necessary, the two refrigerant pipes 20a, 20b can be connected in advance at the factory, reducing the amount of work to be done at the construction site.

Furthermore, the second step ST2 may include a step of attaching a canopy 17 to the refrigerant piping duct 10 after arranging the multiple refrigerant pipes 20 inside the refrigerant piping duct 10, as necessary. However, it is expected that the canopy 17 will get in the way when connecting the multiple refrigerant piping ducts 10 made in a factory at the construction site. Therefore, the canopy 17 may be attached to the refrigerant piping duct 10 in a temporary fastening state. Also, the canopy 17 may be attached at the construction site, and the canopy 17 may not be attached to the refrigerant piping duct 10 in the second step ST2, which is performed at the factory.

When the second step ST2 is performed in this manner, a refrigerant piping duct 10 is formed in the factory in which multiple refrigerant pipes 20 are arranged. It is preferable that the length of the refrigerant piping duct 10 formed at the end of the second step ST2 is long enough to allow the refrigerant piping duct 10 to be loaded onto a transport vehicle. Therefore, the refrigerant piping duct 10 installed on the roof of a building is formed as multiple refrigerant piping ducts 10 of a predetermined length or less at the end of the second step ST2.

Next, the third process ST3 is a process of preparing a stand 30 for holding multiple refrigerant piping ducts 10 in a factory and arranging multiple refrigerant piping ducts 10 on the stand 30.

8 is a diagram showing an example of the configuration of the stand 30. The stand 30 is a stand that holds multiple refrigerant piping ducts 10 that are cut to a predetermined length or less so that they do not interfere with each other, and is a transport stand used to transport multiple refrigerant piping ducts 10 from a factory to a construction site. As shown in FIG. 8, the stand 30 has four pillars 31 that are provided at the four corners of a rectangle in a plan view and stand upright in a parallel state, wheels 32 provided at the lower ends of the four pillars 31, a connecting member 33 that connects the lower parts of the four pillars 31 to each other, and multiple holding parts 36 that can be attached and detached to different height positions of the four pillars 31. Each pillar 31 is provided with multiple mounting parts 35 to which the holding parts 36 are attached at a predetermined interval in the height direction, and the holding parts 36 can be attached to the mounting parts 35. For example, the intervals between the multiple mounting parts 35 are set to be slightly larger than the height dimension of the refrigerant piping duct 10. The stand 30 of this embodiment has mounting parts 35 at three locations on one support 31, and three holding parts 36 can be attached to these mounting parts 35. Note that the support 31 in this embodiment is made of a cylindrical metal pipe, but is not limited to this.

Such a stand 30 is, for example, a stand that is short in the X direction and long in the Y direction and has a rectangular shape in a plan view. The length of the stand 30 in the Y direction can be designed according to the length of the refrigerant piping duct 10 to be formed in a factory, for example. The size of the stand 30 can be adjusted as desired by changing the length of the connecting member 33.

The connecting member 33 has clamps 34 at both ends. The clamps 34 are for attaching and detaching the connecting member 33 to the support posts 31. In other words, the connecting member 33 is configured to be detachable from the support posts 31. When the connecting member 33 is removed from the support posts 31, the platform 30 can be carried with the four support posts 31 disassembled.

The holding portion 36 has a holding member 37 that holds the underside of the refrigerant piping duct 10, mounting rods 38 provided on both ends of the holding member 37, and insertion pieces 39 provided on both ends of the mounting rod 38. The holding member 37 is configured by arranging a metal mesh inside a metal frame as shown in FIG. 8, for example. However, this is not limited to this, and the holding member 37 may be configured by two metal rods parallel to each other. The length of the holding member 37 in the Y direction is a length that matches the length of the frame 30 in the Y direction. In addition, the width W2 of the holding member 37 in the X direction is formed to be smaller than the interval W1 (see FIG. 4) between the pair of legs 11, 11 of the refrigerant piping duct 10. Such a holding portion 36 is attached to the support 31 by inserting the insertion pieces 39 provided on both ends of the mounting rod 38 into the mounting portions 35 provided on each support 31 from above. In addition, a mechanism for preventing the insertion piece 39 from coming out of the mounting portion 35 when the insertion piece 39 is inserted into the mounting portion 35 may be provided on either the support 31 or the insertion piece 39. In this embodiment, three holding parts 36 can be installed on the pedestal 30 by inserting the insertion piece 39 into each of the mounting parts 35 provided at three positions in the vertical direction of the support 31. In addition, the pedestal 30 of this embodiment shows an example in which three holding parts 36 can be attached to three mounting parts 35 arranged at a predetermined interval in the vertical direction, but the number of holding parts 36 attached to the pedestal 30 is not limited to this. In other words, the pedestal 30 may be one in which two or more holding parts 36 can be attached.

Figure 9 is a diagram showing an example in which multiple refrigerant piping ducts 10 are arranged on a stand 30. As shown in Figure 9, the stand 30 holds the underside of the refrigerant piping duct 10 with each of multiple holding portions 36. That is, since the width W2 of the holding portion 36 is smaller than the distance W1 between the pair of legs 11, 11 of the support member 13, the holding portion 36 is arranged between the pair of legs 11, 11 and holds the underside of the connecting portion 12 of the support member 13. In addition, the multiple holding portions 36 hold the multiple refrigerant piping ducts 10 at a predetermined distance in the vertical direction without causing the multiple refrigerant piping ducts 10 to interfere with each other.

In this way, the stand 30 can hold the multiple refrigerant piping ducts 10 without damaging them by stacking the multiple refrigerant piping ducts 10 vertically on each of the multiple holding parts 36. That is, as described above, the pair of side wall members 14, 15 of the refrigerant piping duct 10 are thin, about 1 to 2 mm thick, and are easily dented and damaged when an external force acts on the side wall surface. In addition, although the pair of legs 11, 11 of the support member 13 are reinforced to some extent by forming ribs or the like by bending, the base material is thin, about 1 to 2 mm thick, and is easily bent and damaged when an external force acts on the pair of legs 11, 11 from the lateral direction. Therefore, in this embodiment, the stand 30 is capable of holding the refrigerant piping duct 10 without external forces acting on the sidewall members 14, 15 or the pair of legs 11, 11 by using the holding portion 36 to hold the underside of the connecting portion 12 of the support member 13, and prevents damage to the sidewall members 14, 15 or the pair of legs 11, 11 during transportation of the refrigerant piping duct 10.

In addition, because wheels 32 are provided on the bottom of the stand 30, the work vehicle can easily move the stand 30 even when multiple refrigerant piping ducts 10 are loaded on it as shown in FIG. 9. In addition, it is preferable that the stand 30 be equipped with a wheel lock mechanism that prevents the wheels 32 from rolling.

Next, the fourth step ST4 is a step of loading the platform 30 holding the multiple refrigerant piping ducts 10 onto the bed of a transport vehicle and transporting it to the construction site. For example, a crane or the like is used to load the platform 30 holding the multiple refrigerant piping ducts 10 onto the transport vehicle. Once the platform 30 is loaded onto the transport vehicle, the wheels 32 are locked and the platform 30 is fixed to the bed. Figure 10 is a diagram showing the state of the platform 30 in the fourth step ST4. As shown in Figure 10, the platform 30 is transported from the factory to the construction site while being loaded onto the transport vehicle 50. At the construction site, a building 60 is being constructed, and a crane 61 is installed on the roof of the building 60. When the transport vehicle 50 arrives at the construction site, the process proceeds to the fifth step ST5. Note that the fifth step ST5 and subsequent steps are carried out at the construction site.

The fifth step ST5 is a step of lifting the stand 30 with a crane 61 at the construction site and transporting the refrigerant piping duct 10 to the roof of the building 60. The crane 61 may lift the stand 30 holding the multiple refrigerant piping ducts 10 as a whole and transport the multiple refrigerant piping ducts 10 to the roof in one lifting operation. However, this is not limited to this, and the crane 61 may lift the refrigerant piping ducts 10 held by the holding parts 36 one by one from the upper side of the stand 30 and transport them to the roof. When lifting the refrigerant piping ducts 10 one by one, by releasing the anti-pullout mechanism provided on either the support 31 or the insertion piece 39, the crane 61 lifts the holding part 36 and the refrigerant piping duct 10, and the insertion piece 39 is pulled out of the mounting part 35 and can be lifted as it is. Therefore, the work efficiency is excellent.

Then, on the roof of the building 60, work is performed to temporarily place the multiple refrigerant piping ducts 10 in their respective installation positions. This temporary placement work may be performed using a crane 61, as described above. Once the multiple refrigerant piping ducts 10 have been temporarily placed on the roof of the building, the process proceeds to the sixth step ST6.

The sixth step ST6 is a step of connecting the multiple refrigerant pipes 20 housed in the multiple refrigerant pipe ducts 10 to each other while installing each of the multiple refrigerant pipe ducts 10 temporarily placed on the roof of the building 60 in a predetermined appropriate position. Multiple refrigerant pipes 20 are already placed inside the refrigerant pipe ducts 10 temporarily placed on the roof. Therefore, the worker does not need to place the refrigerant pipes 20 inside the refrigerant pipe ducts 10 one by one on the roof of the building 60, but only needs to connect the refrigerant pipes 20 placed in the adjacent refrigerant pipe ducts 10 to each other. In addition, the worker does not need to bend the refrigerant pipes 20 on the roof of the building 60 by bending the refrigerant pipes 20 in advance at the factory and placing them in the refrigerant pipe ducts 10. Therefore, the construction method of this embodiment can significantly reduce the work to be done on the roof of the building 60 compared to the conventional construction method. In the sixth step ST6, a canopy 17 is attached and fixed to the top of the pair of side wall members 14, 15 as necessary. Finally, in this embodiment, the legs 11 of the refrigerant piping duct 10 are fixed to the roof structure (floor) using anchors or the like. As a result, the installation of the refrigerant piping duct 10 with multiple refrigerant pipes 20 arranged inside is completed on the roof of the building 60, for example, as shown in FIG. 1.

In this way, in the construction method of this embodiment, multiple refrigerant pipes 20 are arranged in the refrigerant pipe duct 10 in a factory, and the refrigerant pipe duct 10 with multiple refrigerant pipes 20 arranged inside is brought onto the roof of the building 60, thereby reducing the amount of work that must be done on the roof of the building 60. In particular, in the construction method of this embodiment, some of the bending of the straight refrigerant pipes 20 and the brazing work for connecting the multiple refrigerant pipes 20 are performed in advance at the factory, thereby reducing the amount of work that was previously performed on the roof of the building 60. Therefore, the work of installing the refrigerant pipes 20 on the roof can be performed efficiently, and no work delays occur. Rather, the construction method of this embodiment is a construction method that can shorten the construction period at the construction site.

The stand 30 used in this embodiment can hold multiple refrigerant piping ducts 10 and transport the multiple refrigerant piping ducts 10 from a factory to a construction site at the same time. This provides excellent transport efficiency and reduces transport costs. Therefore, the construction method of this embodiment is excellent in that it can shorten the construction period at the construction site without increasing construction costs.

In addition, after the platform 30 is delivered to the roof of the building 60, each component can be disassembled, allowing workers to lower it from the roof using the building 60's elevator or the like. In other words, there is no need to use a crane 61 when transporting the platform 30 from the roof, which has the advantage that the platform 30 can be transported efficiently.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above. In other words, the present invention includes various modifications of the embodiment described above.

For example, in the above embodiment, the rack 30 holds multiple refrigerant piping ducts 10 in a vertical row. However, the rack 30 may be configured to include multiple holding portions 36 not only in the vertical direction but also in the horizontal direction, allowing more refrigerant piping ducts 10 to be transported simultaneously.

ST1...first step, ST2...second step, ST3...third step, ST4...fourth step, ST5...fifth step, ST6...sixth step, 10...refrigerant piping duct, 11...legs, 13...supporting members, 14, 15...sidewall members, 16...storage space, 20...refrigerant piping, 30...frame (transportation frame), 31...pillars, 33...connecting members, 36...holding portion, 60...building, 61...crane.

Claims (8)

A construction method for installing refrigerant piping for air conditioning on the roof of a building, comprising:
a first step of preparing a support member in a factory, in which a pair of parallel legs are connected at their upper portions by a horizontal connecting part , and arranging a pair of side wall members on the upper surface of the connecting part so as to face each other with a predetermined gap therebetween, thereby forming a refrigerant piping duct of a predetermined length and shape;
a second step of arranging, in the factory, a plurality of refrigerant pipes processed to fit the length and shape of the refrigerant piping duct in an accommodation space sandwiched between the pair of side wall members of the refrigerant piping duct;
a third step of preparing a stand having a width dimension smaller than the distance between the pair of legs, the stand having a plurality of holding parts disposed between the pair of legs and holding an underside of the connecting part at a predetermined distance in the vertical direction, disposing the refrigerant piping duct in which the plurality of refrigerant pipes are disposed within the storage space for each of the plurality of holding parts, and holding the plurality of refrigerant piping ducts by hanging the pair of legs from both sides in the width direction of each of the plurality of holding parts ;
a fourth step of loading the frame holding the plurality of refrigerant piping ducts onto a loading platform of a transport vehicle and transporting the frame from the factory to a construction site of the building;
A fifth step of lifting the frame with a crane at the construction site and transporting the refrigerant piping duct to a roof of the building;
a sixth step of installing each of the plurality of refrigerant piping ducts at a predetermined position on the rooftop of the building and connecting a plurality of refrigerant pipes housed in each of the plurality of refrigerant piping ducts;
A construction method comprising the steps of: The construction method according to claim 1, characterized in that the second step includes a step of attaching a canopy to cover the upper openings of the pair of side wall members after arranging the plurality of refrigerant pipes in the storage space. The base is capable of separating each of the plurality of holding portions,
The construction method according to claim 1 or 2, characterized in that the fifth step comprises using the crane to lift up each of the plurality of holding parts in turn from the top tier, thereby transporting the plurality of refrigerant piping ducts one by one in turn to the roof of the building. The refrigerant piping duct formed in the first step has a bent portion,
4. The installation method according to claim 1, wherein the second step includes a step of bending the refrigerant piping so as to fit the bent portion of the refrigerant piping duct. The construction method according to any one of claims 1 to 4, characterized in that the second step includes a step of connecting multiple refrigerant pipes according to the length of the refrigerant piping duct. A transportation platform for transporting a refrigerant piping duct, the transportation platform having a support member in which upper portions of a pair of parallel legs are connected to each other by a horizontal connecting portion , and a pair of side wall members standing at a predetermined distance from each other on upper surfaces of the connecting portions of the support member , the refrigerant piping duct having a plurality of refrigerant pipings pre-arranged within an accommodation space sandwiched between the pair of side wall members,
a width dimension of the refrigerant piping duct is smaller than the distance between the pair of legs, the refrigerant piping duct has a plurality of holding parts disposed between the pair of legs for holding a lower surface of the connecting part , and the refrigerant piping duct can be simultaneously transported by holding the refrigerant piping duct with each holding part;
The plurality of holding portions are arranged at predetermined intervals in the vertical direction and hold the plurality of refrigerant piping ducts without interfering with each other ,
A transportation stand characterized in that each holding portion holds the underside of the connecting portion, thereby holding the refrigerant piping duct with the pair of legs hanging down on both sides in the width direction . A plurality of support columns are arranged at vertices of a rectangular shape in a plan view;
A connecting member that connects the plurality of columns to each other;
and
7. The transportation platform according to claim 6, wherein the plurality of holding parts are detachably attached to the support pole at positions spaced apart by a predetermined distance in the vertical direction. The transport platform according to claim 7, characterized in that the connecting member is detachable from the plurality of supports.

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