JP4657240B2 - Support structure of venturi-type connecting air duct for air duct in building - Google Patents

Description

  The present invention relates to a support structure for a venturi-type connection air duct of an air duct, which is penetrated and supported in a through hole of a steel beam in a building.

  Conventionally, air ducts for air conditioning in buildings with steel structures and reinforced concrete structures have been made by opening through holes in the steel beam webs laid in the underfloor space and ceiling space, and through the air ducts. Supporting is performed.

For example, as shown in Patent Document 1 below, a through-hole is opened in a web of H-shaped steel (steel beam) suspended and supported by a concrete slab, and a linear sleeve portion (connection air duct) is supported through the through-hole. And a pipe such as an air duct is connected to the sleeve portion.
JP-A-10-231960

By the way, when supporting a plurality of connection air ducts through the steel beam in this way,
(1) Since a plurality of through holes are opened in the steel beam, the opening area of the through holes should be reduced in order to reduce the rigidity reduction.
(2) In order to increase the flow rate of air flowing through the connection air duct, reduce its flow resistance and increase the air flow area of the connection air duct,
(3) Increase the support strength of the connection air duct to the steel beam,
Etc. are required.

  However, in the one disclosed in Patent Document 1, the linear sleeve portion is supported by being penetrated through the through hole of the H-shaped steel (steel beam). .

  This invention is made | formed in view of this situation, and it aims at providing the support structure of the connection air duct of the air duct in the novel building which solved the said problem.

In order to achieve the above object, the invention according to claim 1 is a support structure for a venturi-type connecting air duct of an air duct, which is supported by being penetrated by a steel beam of a building frame.
A venturi tube portion having a narrowest diameter portion at the central portion in the axial direction and a maximum diameter portion at both end portions in the axial direction and having a constricted continuous passage on the inner surface, and connected to both end portions of the venturi tube portion Construct a connection air duct whose main part is a connection air duct body composed of a short cylindrical duct insertion part,
The connecting air duct is passed through the through hole of the steel beam, the minimum diameter portion thereof is positioned in the through hole, and an annular gap is formed between the minimum diameter portion and the through hole. The outer peripheral surface of the central portion in the axial direction of the connecting air duct body is fixedly supported to the through hole of the steel beam via a fixture only at a position that is biased to one side in the axial direction from the minimum diameter portion of the outer diameter of the steel beam. Covering the surface, the support to the through hole of the connection air duct and the gap with a fireproof coating
Furthermore, the outer peripheral surface of the duct insertion portion of the maximum diameter portion of the connection air duct, which is formed slightly smaller than the diameter of the through hole, is fitted and fixed to the inner peripheral surface of the air duct.

  In order to achieve the above object, the invention according to claim 2 is the one according to claim 1, wherein the center of the connection air duct body is aligned with the longitudinal center line passing through the cross-sectional center of the steel beam. It is characterized by.

  According to the invention of each claim, the pressure loss of the air flowing through the venturi-type connection air duct can be reduced, the rigidity reduction of the steel beam can be reduced, and the connection air duct can be made stronger with respect to the steel beam. Can be supported.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  FIG. 1 is a diagram showing a piping system of an air conditioner equipped with a venturi-type connection air duct in a building of the present invention, FIG. 2 is a perspective view of a penetration support portion of the air duct with respect to a steel beam, and FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is a perspective view of a venturi-type connecting air duct.

  In FIG. 1, a plurality of air duct groups D for air conditioning are piped in an underfloor space (ceiling space) R3 defined between the upper room R1 and the lower room R2, and the upstream side of these air duct groups D Are assembled and connected to the blower fan C of the air conditioner A. In the underfloor space R3, a plurality of branch ducts 2 are branched into each air duct 1, and the downstream end of each branch duct 2 passes through the ceiling wall R and communicates with the downstairs room R2. The air-conditioned air is pressurized by the blower fan C and is pumped to the plurality of air ducts 1, and is fed from there to the downstairs room R <b> 2 through the branch duct 2.

  The air duct group D is penetrated and supported by a plurality of steel beams B that support the concrete slab S of the upper chamber R1.

  Next, the structure of the air duct 1 and its support structure to the steel beam B will be described in detail with reference to FIGS.

  A venturi-type connection air duct 3 is connected to the air duct 1 in the middle thereof, and the connection air duct 3 is penetrated and supported by the steel beam B of the building frame. The connection air duct main body 4 constituting the main part of the connection air duct 3 includes a venturi pipe portion 5 and duct insertion portions 6 and 6 integrally connected to both ends thereof. The Venturi tube portion 5 has a minimum diameter portion 5a (diameter 5aD) at the center in the axial direction and maximum diameter portions 5b and 5b at both ends connected to the duct insertion portions 6 and 6, and has a center c. A constricted continuous passage 7 having no stepped portion is formed on the inner surface thereof in a symmetrical manner with respect to the diameter line passing through. On the other hand, the duct insertion portions 6 and 6 are formed in a short cylindrical shape, and the outer diameter 6D is formed to be slightly smaller than the diameter 10D of the through hole 10 opened in the steel beam B, and is formed on the outer peripheral surface thereof. The air duct 1 is connected integrally.

As shown in FIGS. 3 to 5 , the outer peripheral surface of the central portion in the axial direction of the venturi pipe portion 5 of the connection air duct 3 is only at a position biased to one axial direction from the minimum diameter portion 5 a of the connection air duct body 4. A plurality (four) of fixtures 8 are fixed at equal intervals in the circumferential direction, and these fixtures 8 are engaged and supported by the inner peripheral edge of the through hole 10 of the steel beam B.

  As shown in FIG. 2, the steel beam B is made of H-shaped steel, and the web 11 has through-holes 10 formed of a plurality of circular holes spaced in the longitudinal direction.

  As shown in FIG. 3, the connection air duct 3 is inserted into the through-hole 10 from one side of the steel beam B alone, and is fixed to the outer peripheral surface of the central portion in the axial direction of the venturi tube portion 5. Is engaged with and supported by the inner peripheral surface of the through hole 10. As a result, the connection air duct 3 is supported through the through hole 10 of the steel beam B. In this supported state, the center c of the connection air duct 3 can be positioned on the longitudinal center line LL passing through the cross-sectional center 12 of the steel beam B, and the minimum diameter portion 5a of the connection air duct 3 is formed in the through hole. 10, and a relatively wide annular gap 14 can be formed between the through hole 10 and the connection air duct 3.

  As shown in FIG. 3, the entire outer peripheral surface of the steel beam B, the support portion for the through hole 10 of the connection air duct 3, and the annular gap 14 are covered with a fireproof covering material 16.

  The inner peripheral surface of the end portion of the air duct D is closely fitted to the outer peripheral surfaces of the duct insertion portions 6 and 6 at the left and right ends of the connection air duct 3 with the tape 17 interposed therebetween, and these are integrated by a fixing tool 18 such as a screw. Fixed.

  Next, the operation of this embodiment will be described.

  Now, the conditioned air supplied from the blower fan C of the air conditioner A flows from one air duct 1 to the other air duct 1 through the venturi-type connecting air duct 3 as shown by arrows in FIGS. The air duct 3 has a venturi tube portion 5 as a main portion. The venturi tube portion 5 has a minimum diameter portion 5a at the center in the axial direction and has a maximum diameter portion 5b having the same diameter as the air duct 1 at both ends. In addition, since it has a smooth continuous constriction passage 7 having no step on its inner peripheral surface, the flow resistance is reduced while ensuring a sufficient flow rate of the air-conditioning air flowing through the connection air duct 3 to reduce pressure loss. Can be minimized. Further, since the minimum diameter portion 5a of the connection air duct 3 is positioned in the through hole 10 of the steel beam B, the connection air duct 3 can penetrate the through hole 10 while sufficiently securing the flow rate of the circulating air. Therefore, the connection work of the air duct 1 to the both ends is easy. Furthermore, since it is sufficient for the through hole 10 to have a size that simply allows the connection air duct 3 to pass therethrough, the opening area thereof can be suppressed small, and a decrease in rigidity of the steel beam B can be reduced. Furthermore, by forming a relatively wide annular gap 14 between the through hole 10 and the connection air duct 3, it becomes easier to support the connection air duct 3 with respect to the steel beam B, and the support strength of the connection air duct 3 is increased. Can do.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

The figure which shows the piping system of an air conditioner provided with the venturi type connection air duct in this invention building Perspective view of air duct penetration support for steel beam Sectional view along line 3-3 in FIG. Sectional view along line 4-4 in FIG. Perspective view of venturi-type connecting air duct

3 ... Connection air duct 4 ... Connection air duct body 5 ... Venturi tube 5a ... Minimum diameter 5b ...・ ・ ・ ・ Maximum diameter part 6 ・ ・ ・ ・ ・ ・ ・ ・ Duct insertion part 7 ・ ・ ・ ・ ・ ・ ・ ・ Constriction passage 8 ・ ・ ・ ・ ・ ・ ・ ・ Fixing tool 10 ・ ・ ・ ・ ・ ・・ Through hole 12 ......... Cross section center (steel beam)
14 ・ ・ ・ ・ ・ ・ ・ ・ Gap 16 ・ ・ ・ ・ ・ ・ ・ ・ Fireproof coating B ・ ・ ・ ・ ・ ・ ・ ・ ・ Steel beam c ・ ・ ・ ・ ・ ・ ・ ・ Center (connecting air duct body)

Claims (2)

A support structure for an air duct venturi-type connecting air duct, which is supported through the steel beam (B) of the building frame,
A Venturi tube portion (5) having a constricted passage (7) which has a minimum diameter portion (5a) at the central portion in the axial direction and a maximum diameter portion (5b) at both end portions in the axial direction and which is smoothly continuous with the inner surface; The connection air duct (3) is composed mainly of a connection air duct body (4) composed of a short cylindrical duct insertion part (6) connected to both ends of the venturi pipe part (5),
The connection air duct (3), by penetrating the through hole (10) of said steel beam (B), the minimum diameter portion (5a) is positioned in the through hole (10), the minimum diameter portion (5a) An annular gap (14) is formed between the through hole (10) and the connecting air duct only at a position that is biased in the axial direction from the smallest diameter part (5a) of the connecting air duct body (4). The outer peripheral surface of the central portion in the axial direction of the main body (4) is fixedly supported to the through hole (10) of the steel beam (B) through the fixture (8), and the outer peripheral surface of the steel beam (B), the connection air duct ( 3) supporting the through hole (10) to the through hole (10) and the gap (14) with a fireproof covering material (16);
Further, the outer peripheral surface of the duct insertion portion (6) of the maximum diameter portion (5b) of the connection air duct (3), which is formed to be slightly smaller than the diameter of the through hole (10), is formed inside the air duct (1). A support structure for a venturi-type connecting air duct of an air duct in a building, characterized by being fitted and fixed to a peripheral surface.   The center (c) of the connection air duct body (4) is made to coincide with the longitudinal center line (LL) passing through the cross-sectional center (12) of the steel beam (B). Support structure for venturi-type connecting air duct of air duct in the building described.

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