JP3043602B2 - System ceiling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of arranging a plurality of T-bars at predetermined intervals on a ceiling surface, installing a ceiling material and lighting equipment on these adjacent T-bars, and placing a sprinkler head under the ceiling. The present invention relates to a system ceiling structure in which sprinkler pipes are arranged under the ceiling in a state where the sprinkler pipes are exposed.

[0002]

2. Description of the Related Art When a sprinkler is installed behind a ceiling, a main pipe connected to a water supply side is fixed to a floor slab, and a number of yarns are stretched on a lattice on a ceiling surface. The intersections of the yarns are set as sprinkler head installation points, and the sub-pipes connected to the sprinkler heads are fixed to the channels or T-bars suspended from the floor slab while the sprinkler heads are located at these intersections, respectively. The sub pipe and the main pipe are connected, and thereafter, a sprinkler head penetration hole is formed in a portion corresponding to the sprinkler head of each ceiling plate installed between the T-bars, and the sprinkler head is formed on the ceiling plate. They are arranged in a penetrating state.

[0003] In the above-mentioned mounting method, before installing the sprinkler pipes, it is necessary to mark the stretched positions for stretching a large number of yarns at predetermined positions while measuring the dimensions on the side wall surface. Fixing the sub-piping to the channel or T-bar while visually aligning the sprinkler head at the intersection of the stretched yarns is a very troublesome operation, and the operation time is troublesome. There were many disadvantages. or,
If the above-mentioned stretching work is not performed before the work of arranging the basic structural members of the system ceiling such as the suspension bolts and channels suspended from the ceiling is completed, the basic structural members will not be obstructed when the yarn is stretched. This is very difficult to perform, and there is a disadvantage in the work surface that is restricted by the work order of the system ceiling.

[0004] In order to solve the above-mentioned disadvantages, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 6-70994. This is to form an installation hole for inserting the sprinkler head between the T-bars as slit forming members opposing at a small interval, and to contact the upper end surface of the T-bar to adjust the vertical position of the sprinkler head. The sprinkler head installation tool is provided with a regulating surface to regulate, so that the vertical positioning of the sprinkler head can be easily performed, and the installation work of the basic components of the system ceiling such as the channel and the T-bar has been completed. So that I can do the work later.

[0005] However, although the sprinkler head can be easily positioned in the vertical direction, no means for positioning the sprinkler head in the horizontal direction required for equipment is provided, and a large number of sprinkler heads are arranged. Each piece must be arranged while being positioned in the horizontal direction, and in this respect, there is a disadvantage that work efficiency is reduced.

In addition, the main pipe is fixed to the floor slab side, and the sub pipe is fixed to a lighting fixture suspended from the floor slab via a T-bar suspended from the floor slab. Are simply connected by a joint or the like. For example, when the vibration between the floor slab and the lighting fixture (ceiling surface) differs when an earthquake occurs, that is, when the swing of the main pipe and the sub pipe differs, a large force is applied to the joint. Is added, the part is damaged, and a malfunction such as discharge of water may occur. In addition, there is an inconvenience that various secondary disaster treatments, such as treatment of water after malfunction, repair of sprinkler piping, and repair of other buildings such as ceiling boards caused by malfunction, must be performed.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, the present invention seeks to solve the above problems by not only facilitating the vertical positioning of the sprinkler head, but also the horizontal direction of the sprinkler head. In addition to the above, the positioning of the sprinkler can be easily performed, and troubles such as breakage can be avoided even when a large force is applied to the sprinkler pipe due to an earthquake or the like.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of T-bars arranged at predetermined intervals on a ceiling surface and a ceiling installed between these adjacent T-bars. Materials and lighting equipment, connected to the water supply side and suspended above the ceiling
A first pipe which is supported to be lowered , a sprinkler head is connected thereto, and a second pipe which is fixed to the lighting fixture, and which connects the first pipe and the second pipe. A displaceable connection pipe, and a mounting portion for mounting the sprinkler head-side portion of the second pipe in a penetrating state on a bulk portion of the lighting fixture at a required mounting pitch in a longitudinal direction of the lighting fixture. And a distance between the mounting portions is determined based on a sprinkler head installation standard so that the mounting portions are present in the other direction that intersects the direction in which the mounting portions are formed. Arrange the lighting fixture so as to be within the range, make the connection pipe a flexible joint, and use the mounting part as a mounting part for low power equipment such as a broadcast speaker, emergency light, fire detector, outlet, etc. To have.

[0009]

The lighting fixture is provided with a plurality of attachment portions along the longitudinal direction of the lighting fixture so as to attach the sprinkler head-side portion of the second pipe in a penetrating state to the bulk of the lighting fixture. After being installed on the sprinkler head, only the sprinkler head-side portion of the second pipe is sequentially attached to the mounting portion of the lighting fixture, so that the sprinkler head can be positioned not only in the vertical direction but also in the horizontal direction. The head can be disposed with the head positioned at a predetermined position. Moreover, the lighting is performed such that the mounting portion exists in the other direction that intersects the longitudinal direction of the lighting device , and that the distance between the mounting portions is within a range determined by the installation standard of the sprinkler head. By arranging the fixtures, the required number of sprinkler heads can be easily and quickly arranged in a large room where a large number of ceiling boards are arranged.
The range determined by the sprinkler head installation standard means that the distance between the sprinkler heads is 4600.
mm. The distance between the sprinkler heads of 4600 mm indicates a case where the structure of the building is a fireproof structure. If the structure of the building is a non-fireproof structure, the distance between the sprinkler heads is 4200 mm.
Is set to

By connecting the first pipe and the second pipe by a displaceable connecting pipe, for example, the first pipe fixed on the floor slab side and the second pipe fixed on the lighting fixture side when an earthquake occurs. When the swing of the connecting pipe is different, even if a large force is applied to the connecting pipe, the force can be absorbed by the displacement of the connecting pipe, so that breakage of the sprinkler pipe can be avoided. In addition, due to the configuration in which the connection pipe is displaced, even when the connection distance between the first pipe and the second pipe slightly changes, the connection pipe displaces and absorbs it without interposing a joint member or the like, The first pipe and the second pipe can be easily connected.

By using the mounting portion as a mounting portion for low power equipment such as a broadcast speaker, an emergency light, a fire detector, and an outlet, a speaker for a broadcast, an emergency light, a fire detector, and an outlet are used. It is not necessary to provide a special mounting portion for the light electric equipment, and the working time of the system ceiling can be shortened accordingly.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 shows a system ceiling structure in which a suspension bolt 2 and a hanger 3 are attached to a C-shaped channel 1 suspended from an upper floor slab (not shown).
A part of the plurality of T-bars 4 made of a plurality of metal wires is suspended and supported in a direction parallel to each other at a predetermined interval in one direction of the ceiling surface, and the remaining T-bars 4 4 is suspended and supported in a posture parallel to each other at predetermined intervals in a state of intersecting with the T-bar 4 suspended and supported in one direction in the other direction of the ceiling surface. Between the adjacent T-bars 4, a glass wool sound-absorbing plate, a rock wool decorative sound-absorbing plate, a rock wool sound-absorbing plate or a composite plate, a decorative welded wire mesh, a louver, other ceiling materials and the like, and a lighting device. 6 is installed.

A first pipe 9a connected to the water supply side from the floor slab to a suspension bolt 7 via a fixture 8 is suspended and supported, and sprinkler heads 10a, 10
As shown in FIGS. 1 to 3, the second pipe 9 b to which a is connected is positioned above the lighting fixture 6, and is aligned in a straight line in the longitudinal direction of the lighting fixture 6. The lighting fixture 6 is fixed via a fixture 12 to a pair of support brackets 11, 11 disposed on the upper surface of a shank 6b, and the first pipe 9a is connected to the first pipe 9 of the second pipe 9b.
The end on the a side is connected by a connection pipe 9c to form a sprinkler pipe 9 of the fire extinguishing equipment.

The second pipe 9b will be described in detail. The second pipe 9b has a first branch pipe 14a having one end connected to a sprinkler head 10a through an L-shaped joint 13 in a horizontal direction. A second branch pipe 14b connected to the other end of the first branch pipe 14a in the same horizontal direction via a T-shaped joint 15;
5 Sprinkler head 10a at the downward joint
And the first pipe 9 of the second branch pipe 14b.
The end on the a side is connected by the connection pipe 9c as described above.

As described above, the pair of second pipes 9 are arranged above the lighting fixture 6 in a state of being aligned in the longitudinal direction thereof.
By setting the dimensions of each second pipe 9b so that b and 9b can be arranged, it is possible to make the second pipe 9b advantageous in terms of handling during assembling work, transportation and the like. The second pipe 9b
Is not limited to this.

The sprinkler head 10a has a heat-sensitive portion, and an upper end of the heat-sensitive portion is fitted to a vertical pipe portion 10b, and an upper end portion of the vertical pipe portion 10b is connected to the second pipe 9b.
And these sprinkler heads 10a
And the vertical tube portion 10b and the sprinkler head portion 1
Called 0.

The connection pipe 9c is formed of a flexible joint. Even if the connection distance between the first pipe 9a and the second pipe 9b is slightly changed, the connection pipe 9c is connected to the flexible joint 9c.
In addition, even if the first pipe 9a and the second pipe 9b swing differently when an earthquake occurs, for example, the flexible joint 9c absorbs the same, and the first pipe 9a and the second pipe 9b are damaged. There is no such thing. The connecting pipe 9c may be made of a rubber material having excellent elastic deformation, a non-combustible stretchable cloth material, or a deformable synthetic resin material. Can be freely changed as long as it is displaceable.

FIG. 3 shows the lighting fixture 6 in detail.
~ As shown in FIG. 5, the FLR110W × 2 lamp 6
The lighting fixture 6 is composed of the lamps 6a, 6a and a shank 6b for attaching and supporting the lamps 6a, 6a, and a portion of the second pipe 9b on the sprinkler head 10a side is attached to the shank 6b in a penetrating state. 6c for mounting
Are formed at a mounting pitch R of 420 mm along the longitudinal direction of the shank 6b having a dimension of 2520 mm, and among the many mounting portions 6c formed on the lighting fixture 6 arranged in a straight line. Sprinkler head 10a
The sprinkler head 10a side portion of the second pipe 9b is attached in a penetrating state to the mounting portion 6c corresponding to the mounting pitch 3780 mm required in the installation standard of the second embodiment, that is, the mounting portion 6c located in the ninth direction in the forming direction of the mounting portion 6c. I have to. Then, the mounting portion 6c should be present in a direction orthogonal to the longitudinal direction of the bulk portion 6b, and the distance between the mounting portions 6c should be within the range determined by the installation standard of the sprinkler head 10a. The arrangement pitch r between the lighting fixtures 6 is set to 2500 mm. The arrangement pitch r between the lighting fixtures 6 is the vertical and horizontal dimensions of the room, that is, the dimension X between the columns 28, 28, the height of the ceiling, the indoor standard illuminance by the lighting fixture 6, the installation reference distance of the sprinkler head 10a, and Is determined in consideration of, for example, the dimension X between the columns.
Is 7.5 m square, the arrangement pitch r between the lighting fixtures 6 is set to 2.5 m, which can be equally divided by an integer (3). or,
Mounting pitch R of mounting portion 6c formed on lighting fixture 6
= 420 mm is the maximum arrangement pitch r of the arrangement pitch r of the lighting fixture 6 in the case of 9 m square so that the dimension X between the columns can be applied to any dimension of 7.5 m to 9 m square,
That is, the mounting portion 6c in the direction orthogonal to the mounting portion 6c of the lighting fixture 6 arranged at an arrangement pitch r = 3 m in the case of 9 m square.
Is determined by a common divisor of the installation reference distance of the sprinkler head 10a and a dimension that can be equally divided in the longitudinal direction of the lighting fixture 6. In addition, the attachment pitch Y of the sprinkler head 10a in the longitudinal direction of the bulk portion 6b is set to 37.
80 mm, and the arrangement pitch r of the lighting fixture 6 is 250
Although set to 0 mm, any distance may be set as long as the distance Z between the sprinkler heads 10a is not a distance exceeding 4600 mm. The distance Z between the sprinkler heads 10a of 4600 mm indicates a case where the structure of the building is a fireproof structure, and when the structure of the building is a non-fireproof structure, the distance Z between the sprinkler heads 10a is 4 mm.
It is set to 200 mm. Incidentally, when the dimension X between the columns is 8 m square, the arrangement pitch r between the lighting fixtures 6 is 2
667 mm, and the attachment pitch Y of the sprinkler head 10 a in the longitudinal direction of the bulk portion 6 b is 3360 mm.
When the dimension X between the pillars is 8.5 m square, the arrangement pitch r between the luminaires 6 is set to 2833 mm, and the sprinkler head 10 in the longitudinal direction of the bulkhead 6 b is set.
aSet the mounting pitch Y to 3360 mm and set the dimension X between the columns.
Is 9 m square, the arrangement pitch r between the lighting fixtures 6 is 3000 mm, and the sprinkler head 10a mounting pitch Y in the longitudinal direction of the bulk portion 6b is 3360 m.
m.

[0019]

[Table 1]

Table 1 and FIG. 13 show in detail the relationship between the arrangement pitch r between the lighting fixtures 6, the mounting pitch Y of the sprinkler head 10a, and the dimension X between the columns 28, 28. Z = 4600 mm in Table 1 indicates the distance between the sprinkler heads 10a when the structure of the building is a fire-resistant structure, as described above, and Z = 4200 mm in Table 1 indicates that the structure of the building is non-fire-resistant as described above. The distance between the sprinkler heads 10a in the case of the structure is shown. When the dimension X between the columns 28, 28 is within the range of 7500 mm to 9000 mm shown in the table, as shown in FIG. A value obtained by dividing the arrangement pitch r between the six lighting fixtures 6 by the number 3 of the lighting fixtures 6 provided,
In the case where the dimension X between the lighting fixtures 8 and 28 is 11000 mm shown in the table, the arrangement pitch r between the lighting fixtures 6 is determined by the arrangement pitch of the lighting fixtures 6 because four rows of the lighting fixtures 6 are arranged between the columns 28 and 28. The value is divided by four.

The mounting portion 6c is, as shown in FIG.
The luminaire 6 is composed of arc-shaped thin portions 17 formed in a bulk portion 6b of the luminaire 6, and a hole 6d formed by punching out a required thin portion 17 of the thin portions 17 with a hammer or the like. Sprinkler head 10 of second pipe 9b
The a-side part is attached in a penetrating state. The mounting portion 6c may be constituted by a thin portion 17 having an arc shape, or may be constituted by a hole which is punched and formed in an annular shape such as an arc shape or a square shape. As shown in FIG. 7, the mounting portion 6 is inserted through the previously punched hole 6d.
In the case of configuring c, a cover or the like for closing this hole may be attached to a hole that is not used as the mounting portion 6c.

As shown in FIG. 5, the mounting portion 6c includes a broadcast speaker 18, an emergency light 19, and a fire detector 2.
0, which is used as a mounting part for the broadcast speaker 1
8. The emergency light 19 and the fire detector 20 can be mounted without special mounting parts. In addition, 27 shown in the figure is an outlet connected to the duct of the air conditioner, and 28 is a pillar.

FIG. 6 shows a screened glass 21 as a smoke-proof hanging wall.
Is shown. This means that the aluminum channel 23 for smoke-proof hanging walls is suspended and supported by the reinforcing channel 22 suspended and supported from above, and the meshed glass 21 is held and supported by the aluminum rail 23 for hanging smoke-proof walls. . Numeral 24 shown in the figure is an end plate for closing the end of the small lighting fixture 25 installed on the T-bar 4, and the T-bar 4 for placing and supporting the small lighting fixture 25 is used for the smoke prevention. It is fixed to the vertical wall aluminum rail 23.

Next, the attachment of the sprinkler pipe 9 will be described. After the lighting fixture 6 is placed and supported between the T-bars suspended and supported, or before the lighting fixture 6 is placed and supported, the sprinkler head 10a is attached to the mounting location. The corresponding mounting portion 6c is punched to form holes, and the sprinkler head 10a of the second pipe 9b is penetrated through these holes. At this time, the lower surface of the horizontal pipe part on the first pipe 9a side of the second pipe 9b is supported by the support bracket 11 of the bulk part 6b of the lighting fixture 6.
The sprinkler head 10a comes into contact with the upper surface, and the vertical positioning of the sprinkler head 10a is completed. Thereafter, the second pipe 9
The first branch pipe 14a and the second branch pipe 14b are fixed on the support bracket 11 by the fixture 12. After the fixing of the second pipe 9b, the second pipe 9b is connected to the first pipe 9a previously suspended and supported on the floor slab by the flexible joint 9.
They are connected by c. Then, the sprinkler head 10a is fitted from below the lighting fixture 6. The mounting portion 6c of the broadcast speaker 18, the emergency light 19, the sensor 20, and the weak electrical equipment such as an outlet may be punched together when the mounting portion 6c of the sprinkler head 10 is punched.

As shown in FIGS. 7 to 9, the luminaire 6 has lamps 6a, 6a arranged on one side in the width direction of the bulk portion 6b, and a sprinkler on the other side in the width direction of the bulk portion 6b. The head 10 may be attached. In this case, as shown in FIG. 9, the first pipe 9a is
b may be directly fixed via the fixture 12. Further, the lamps 6a, 6a of the lighting fixture 6 may be configured to be 40 W × 2 in addition to 110 W × 2, and the wattage and the number of lamps of the lighting fixture 6 can be freely changed. When the lamp is set to 40W × 2, as shown in FIG.
Attach the mounting portion 6c of the second pipe 9b in the longitudinal direction of the
It will be formed individually. In the drawing, a hole 6d in which the mounting portion 6c is formed by punching is shown.

As shown in FIG. 11, the fall prevention metal fittings 26, 6 extend over the hooks 6e, 6e located at the lower end portions of the shank 6b and the upper portions of the T-bars 4, 4 located thereabove.
26 are provided, and when the T-bars 4 and 4 vibrate up and down due to the occurrence of an earthquake or the like, the hook portions 6 at both upper end portions of the bulk portion 6b are provided.
The f and 6f may not be displaced from the upper end surfaces of the T bars 4 and 4.

[0027]

System ceiling structure obtained by the present invention as described above is the bulk portion of the inherently provided cause luminaire, the mounting portion luminaire for mounting the sprinkler head side portion of the second piping through state By forming a plurality of sprinkler heads in the longitudinal direction , it is possible to easily and quickly arrange the sprinkler heads at predetermined positions without performing the positioning in the vertical direction as well as the positioning in the vertical direction. In addition, by arranging the lighting fixtures configured as described above rationally, the required number of sprinkler heads can be easily and quickly arranged at appropriate positions in a large room where a large number of ceiling panels are arranged. The system ceiling structure can be provided, and the working time can be further reduced.

Moreover, if the connecting pipe is configured to be displaceable,
When an earthquake or the like occurs, damage to the sprinkler piping or the like due to the direct cause thereof can be reliably avoided, and a system ceiling structure that can prevent a secondary disaster from occurring can be provided. Then, even if the connection distance between the first pipe and the second pipe is slightly changed, it can be absorbed and easily connected, and the working time can be shortened from this point as well.

Further, if the mounting portion is used as a mounting portion for low power equipment such as a broadcasting speaker, an emergency light, a fire detector, and an outlet, a broadcasting speaker, an emergency light, a fire detector, an outlet, and the like are provided. It is not necessary to provide a special mounting portion for the light electric equipment, and the working time can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a system ceiling structure.

FIG. 2 is a partially cutaway longitudinal side view showing a sprinkler mounting structure.

FIG. 3 is a longitudinal sectional front view showing a sprinkler mounting structure.

FIG. 4 is a plan view of a lighting fixture.

FIG. 5 is a schematic diagram showing a system ceiling structure.

FIG. 6 is a perspective view showing a main part of a system ceiling structure.

FIG. 7 is a plan view showing another embodiment of the lighting fixture.

FIG. 8 is a longitudinal sectional front view showing another embodiment of the sprinkler mounting structure.

FIG. 9 is a longitudinal sectional rear view of a main part showing another embodiment of the sprinkler mounting structure.

FIG. 10 is a longitudinal sectional view showing a mounting portion of a lighting fixture.

FIG. 11 is a longitudinal sectional front view showing another embodiment of the sprinkler mounting structure.

FIG. 12 is a plan view showing another embodiment of the lighting fixture.

FIG. 13 is a schematic diagram showing a positional relationship among a pillar, a sprinkler head, and a lighting fixture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 C-type channel 2 Hanging bolt 3 Hanger 4 T-bar 5 Ceiling panel 6 Lighting fixture 6a Lamp 6b Shade section 6c Mounting section 6d hole 6e Hook section 6f Hook section 7 Hanging bolt 8 Fixture 9 Sprinkler pipe 9a First pipe 9b Second Piping 9c Connecting pipe 10 Sprinkler head 10a Sprinkler head 10b Vertical pipe 11 Support bracket 12 Fixture 13 L-shaped joint 14a First branch pipe 14b Second branch pipe 15 T-shaped joint 16 Nut 17 Thin section 18 Speaker 19 Emergency light 20 Detector 21 Glass 22 Reinforcement channel 23 Aluminum rail 24 End plate 25 Lighting fixture 26 Leaf spring 27 Outlet 28 Column r Arrangement pitch R Mounting pitch X Dimension between columns Y Sprinkler mounting pitch Z Distance between sprinkler heads

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000140269 Endo Lighting Co., Ltd. 1-2-17 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka (73) Patent holder 000155838 Tachibori Seisakusho Co., Ltd.Kohokucho, Higashiasai-gun, Shiga Prefecture 280 Kokura (72) Inventor Yasuo Nakabayashi 7-1-4 Aoyama, Shisen-cho, Miki-shi, Hyogo Consumer cooperative co-op Kobe (72) Inventor Shinichi Takagi 4-11-27 Nishinakajima, Yodogawa-ku, Osaka Inside the NA New Building Research Institute (72) Inventor Yu Oku 4-11-11, Nishinakajima, Yodogawa-ku, Osaka City Inside the NA New Building Research Institute (72) Inventor Tatsuo Nakatani Osaka 1-114-9, Imaichi, Asahi-ku, Takeden Corporation (72) Inside the Inventor Nao Murayama 1-114-9, Imaichi, Asahi-ku, Osaka City Inside Takeden Corporation, (72) Inventor Suzu 1-14-9, Imaichi, Asahi-ku, Osaka-shi Inside Takeden Co., Ltd. (72) Inventor Tadayoshi Kawakami 4-3-1-10 Koraibashi, Chuo-ku, Osaka-shi Nippon Boseki Co., Ltd. (72) Inventor Kajiya Eiji 1-27-1 Nishihonmachi, Nishi-ku, Osaka-shi Inside Endo Lighting Co., Ltd. (72) Inventor Masahiro Murayama 1-11-1 Takaida Nishi, Higashi-Osaka City Inside Endo Lighting Co., Ltd. (72) Inventor Kuji Ishida Osaka-shi 1-10-10 Nishi-ku Tateoribori Inside Tateoribori Seisakusho Co., Ltd. (56) References JP-A-4-309374 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 9/00 A62C 35/68

Claims (4)

(57) [Claims] 1. A plurality of T-bars arranged at predetermined intervals on a ceiling surface, a ceiling material and a lighting device installed between these adjacent T-bars, and connected to a water supply side and above the ceiling To
A first pipe suspended and supported, and a sprinkler head
There are connected, and the comprises a second pipe that is fixed to the luminaire, and a displacement freely connecting pipe for connecting the second pipe and the first pipe, the bulk portion of the luminaire A plurality of attachment portions for attaching the sprinkler head side portion of the second pipe in a penetrating state are formed at a required attachment pitch along the longitudinal direction of the lighting fixture, and the attachment portion is formed. A system in which the luminaire is arranged such that the mounting portions are present in the other direction that intersects the direction and the distance between the mounting portions is within a range determined by a sprinkler head installation standard. Ceiling structure. 2. The system ceiling structure according to claim 1, wherein said connection pipe is a flexible joint. 3. The system ceiling structure according to claim 1, wherein the mounting portion is used as a mounting portion for low power equipment such as a broadcast speaker, an emergency light, a fire detector, and an outlet. 4. The sprinkler head of the first pipe, wherein the mounting portion is formed of an arc-shaped thin portion formed in a bulk portion of the lighting fixture, and a hole formed by punching out the arc-shaped thin portion. 2. The system ceiling structure according to claim 1, wherein the side portions are attached in a penetrating state.