JPH116584A - Connection method of actual duct - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily and quickly connect extension ducts 3 to both ends of an actual pipe duct 2 buried in a skeleton concrete. SOLUTION: After the concrete of the beam part 1 is hardened, the formwork is dismantled and removed, and from the inner peripheral side of the actual pipe duct 2 exposed on the side part of the beam part concrete 1, the protruding end of the connection metal fitting 5 bent. The portion 5b is extended outward to protrude. One cylindrical portion 4a of the insertion joint 4 is inserted into the inner periphery of the end of the actual pipe duct 2, and one end of the extension duct 3 is inserted into the outer periphery of the other cylindrical portion 4b of the insertion joint 4. Next, a screw is screwed into the peripheral wall of the extension duct 3 from the protruding end portion 5b of the connection fitting 5, so that the extension duct 3 is prevented from falling off and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting ducts installed as a wind tunnel for air conditioning, ventilation, smoke emission, etc. in a building. The present invention relates to a method for connecting an open end of an integrated real pipe duct and an extension duct extending to the outside thereof.

[0002]

2. Description of the Related Art A steel round duct is one type of duct provided in a concrete building. A spiral duct 104 as shown in FIG. 5D is often used as the round duct. In the construction of the portion where the spiral duct 104 penetrates the frame, generally, first, FIG.
As shown in FIG. 1A, a sleeve 103 for forming an opening through which a duct extends is set in advance in a mold 102 for placing a skeleton concrete 101. Next, concrete is poured into the formwork 102, and when this concrete (the frame concrete 101) is hardened, FIG.
As shown in FIG. 5B, the mold 102 is disassembled and removed, and the sleeve 103 is removed. As a result, an opening 101a formed in the skeleton concrete 101 is placed in FIG.
Insert the spiral duct 104 as shown in FIG.
The gap between the spiral duct 104 and the opening 101a is filled with mortar 105.

Next, when the spiral duct 104 is firmly fixed to the concrete body 101 by hardening of the mortar 105, as shown in FIG. 5D, the spiral duct 104 projecting from the concrete body 101 is formed.
Spiral duct 107 for extension is connected to both ends of plug through a joint 106. Spiral duct 104 penetrating skeleton concrete 101 and bayonet joint 106
And the overlapping portion of the insertion joint 106 and the other spiral duct 107 are fixed to each other by screwing screws 108.

However, in the above-described construction method, the form 10
Work to remove the sleeve 103 after disassembly and removal of 2,
It is necessary to fill the gap between the spiral duct 104 and the opening 101a with the mortar 105, and the mortar 105 is hardened so that the spiral duct 1 is hardened.
There is a problem that the extension spiral duct 107 on the outside cannot be connected until the 04 is firmly fixed. Therefore, in recent years, the spiral duct (sleeve 10) has been set by setting the spiral duct itself in the mold 102 instead of the sleeve 103.
Unlike a temporary material such as 3, it is used as it is as a duct in the skeleton penetrating portion, so it is called an actual pipe duct). In other words, according to this method, the actual pipe duct is
There is an advantage that it is not necessary to remove the mortar 105 after disassembling and removing it, and the work of filling the mortar 105 becomes unnecessary.

[0005]

However, when the above-described actual pipe duct is arranged in the mold 102, both ends are fixed to the inner surface of the mold 102, like the sleeve 103. Since it does not protrude from the surface of the skeleton concrete 101, as shown in FIG.
Screws cannot be screwed into the overlapping portion a between the both ends of the 4 ′ and the insertion joint 106 to be fixed. Therefore, for example, the bracket 10
9 and a bolt 110 penetrates from the bracket 109 to an overlapping portion b of the insertion joint 106 and the spiral duct 107 to thereby make the actual pipe duct 1
It is necessary to fix (prevent) the insertion joint 106 and the spiral duct 107 from the 04 ′, and the operation is complicated.

The present invention has been made in view of the above circumstances, and a technical problem thereof is that an extension duct is connected to both ends of an actual pipe duct buried in a concrete body. It is an object of the present invention to provide a connection method capable of easily and quickly performing the work of performing the connection.

[0007]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, according to the connecting method of the actual pipe duct according to the present invention, a required number of connecting fittings are protruded at both ends of the actual pipe duct, and the protruding end of the connecting fitting is bent toward the inner peripheral side of the actual pipe duct. In this state, the both ends of the actual pipe duct are fixed to predetermined positions on the inner surface of the mold, and the frame concrete poured into the mold is hardened and the mold is disassembled and removed. Protrude outward from both ends of the actual pipe duct, connect extension ducts to both ends of the actual pipe duct via a joint, and fix the protruding end of the connection fitting to the extension duct via fixing means. Things. The "extension duct" here is a duct connected to the actual pipe duct to form a continuous pipe line, and the "fixing means" is screwing of screws or driving of nails, rivets, etc. This includes fixing a plurality of members to each other, welding, and the like.

In the present invention, the required number of connecting fittings protruding from both ends of the actual pipe duct are bent inward in advance, so that the connecting fittings are set when the actual pipe duct is set in the mold. Does not get in the way. Also, when the protruding end of the connecting fitting is bent toward the outer peripheral side of the actual pipe duct, the protruding end is buried in the skeleton concrete poured into the formwork, but the inner peripheral side of the actual pipe duct. This is not the case if it is bent to the side, and if the formwork is dismantled / removed after the cast concrete has hardened, the projecting end of the connecting fitting can be attached to the actual pipe from the inner circumference of the actual pipe duct. The duct can extend outwardly from both ends. The protruding end portions are fixed to extension ducts connected to both ends of the actual pipe duct through plug-in joints by a method such as screwing or welding, whereby the extension duct is connected to the actual pipe duct. And it is fixed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method for connecting an actual pipe duct according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows a state in which the connection between the actual duct 2 penetrating the concrete 1 of the skeleton and the extension duct 3 arranged outside the duct 1 is completed.
The end 2a of the actual pipe duct 2 reaching the side surface of the beam concrete 1 and the end 3a of the extension duct 3 opposed thereto.
Are connected via a bayonet joint 4 and are fixed to each other via a pair of connecting fittings 5.

The bayonet joint 4 is connected to the end 2 of the actual pipe duct 2.
a and cylindrical portions 4a and 4b at both ends which can be inserted into the inner periphery of the end 3a of the extension duct 3 and an annular stopper portion 4c interposed therebetween and bent and projected to the outer peripheral side. The connecting fitting 5 is made of a strip-shaped metal plate, and its inner end 5a buried in the beam concrete 1 is fixed to the outer periphery of the actual pipe duct 2 by screws 6 and protrudes from the side surface of the beam concrete 1. The protruding end 5b is fixed to the outer periphery of the end 3a of the extension duct 3 by a screw 7 screwed through the end 3a of the extension duct 3 and the cylindrical portion 4b of the insertion joint 4.

As shown in the perspective view of FIG.
Is a continuous seam portion 2 in which a strip-shaped steel plate 21 is spirally wound and its overlapping edges are goby-joined.
It is made of a cylindrical spiral duct having a width of 2 and is cut in advance to a length that matches the width of the beam. In order to embed the actual pipe duct 2 in the beam concrete 1 at the time of constructing the skeleton, first, the connecting fittings 5 are attached to the vicinity of both ends of the actual pipe duct 2 with screws 6 in advance. Also,
The protruding end 5b of the attached connection fitting 5 is connected to the actual pipe duct 2
Bend to the inner circumference side.

The screw 6 screwed into the actual pipe duct 2
The inner end portion 5 of the connection fitting 5 with the screw 6 is so set that the insertion of the later-described insertion joint 4 is not hindered.
The mounting position of a is set in consideration of the length of the cylindrical portion 4a of the insertion joint 4.

In the cross-sectional view of FIG. 3, reference numeral 8 denotes a beam formwork forming a beam portion of the formwork assembled for building the skeleton, and a plywood (inside surface of which is in contact with concrete). It is composed of a number of members such as a dam board 81 made of a control panel, etc., and a thick end member 82 for supporting the dam board 81 from the outside, and extends in a direction orthogonal to the cross section shown in the figure. Reference numeral 9 denotes a mold for forming a slab portion. The actual pipe duct 2 in the state shown in FIG. 2 is set in the beam form 8 and both end edges thereof are in contact with the inner surface of the weir plate 81 forming the side surface of the beam portion. Further, since the protruding end portion 5b of the connection fitting 5 attached to the outer peripheral side of the actual pipe duct 2 is bent inward, it does not become an obstacle when setting it in the beam formwork 8,
The entire periphery of both ends of the actual pipe duct 2 is substantially in close contact with the inner surface of the weir plate 81.

Strictly speaking, both end edges of the actual pipe duct 2 are separated from the inner surface of the weir plate 81 of the beam form 8 by the thickness of the connecting fitting 5 bent from the outer peripheral side to the inner peripheral side. However, since the connecting fitting 5 is actually relatively thin enough to be bent by hand, both end edges of the actual pipe duct 2 and the inner surface of the weir plate 81 are substantially in close contact with each other as described above. You can think that it will be.

[0015] When the necessary work associated with the formwork, such as the setting work of the actual pipe duct 2, the installation of reinforcing bars (not shown), the fastening of the separator, etc., is completed, the concrete casting defined by the formwork is completed. Concrete is poured into the space S. As described above, since the entire periphery of the both ends of the actual pipe duct 2 is almost in close contact with the inner surface of the weir plate 81, the uncured concrete poured into the concrete placing space S is filled with the uncured concrete. Hardly penetrates into the inner peripheral side of.

When the poured concrete hardens with the lapse of a predetermined curing period and develops sufficient strength, the form is dismantled and removed. As shown in FIG. 4, the edge of the actual pipe duct 2 is exposed on the side surface of the beam concrete 1 from which the beam form 8 has been removed. The connection metal fitting 5 has its inner end 5a buried in the hardened beam concrete 1, but the protruding end 5b bent toward the inner periphery of the actual pipe duct 2 is in a free state in which it can be displaced. After removing the beam form 8, the protruding end 5 b of each bent connection fitting 5 can be extended outward and protruded as shown by an arrow in the figure.

Next, one cylindrical portion 4a of the insertion joint 4 is inserted into the inner periphery of the end of the actual pipe duct 2 exposed on the side surface of the beam concrete 1, and the other cylindrical portion 4b of the insertion joint 4 is inserted. One end of the extension duct 3 is inserted into the outer periphery. At this time, an adhesive is applied to the cylindrical portions 4a and 4b of the insertion joint 4 in advance as a sealing means for leaking air from between the actual pipe duct 2 and the extension duct 3.
The extension duct 3 is also a spiral duct similar to the actual duct 2.

After connecting the extension duct 3, the actual duct 2
A screw 7 is screwed into the peripheral wall of the extension duct 3 from the protruding end 5b of each of the connection fittings 5 extending therefrom. As a result, not only is the protruding end 5b fixed to the extension duct 3, but also the insertion joint 4 is also fixed at the same time, and the connection state shown in FIG. 1 described above is realized. In this case, it is preferable that a small hole (not shown) is previously formed in the protruding end portion 5b in order to facilitate screwing of the screw 7. In FIG. 1, the screw 7 is screwed into the overlapping portion between the extension duct 3 and the cylindrical portion 4b of the insertion joint 4, but the length of the protruding end 5b of the connection fitting 5 and the length of the cylindrical portion 4b of the insertion joint 4 are set. Depending on the relationship, it is only screwed into the extension duct 3.

The present invention is not construed as being limited to the illustrated embodiment. For example, the connection fitting 5
May be attached to the actual pipe duct 2 by welding, soldering, or the like, or may be integrally formed at the end of the actual pipe duct 2, and the number is arbitrary. Also, as a means for fixing the protruding end portion 5b of the connection fitting 5 to the extension duct 3, a method using rivets, nails, welding, soldering, or the like can be adopted.

[0020]

According to the present invention, even when an actual pipe duct whose both ends do not protrude from the skeleton is used for the duct of the skeleton penetrating portion, connection and fixing to the extension duct can be performed by simple fixing means such as screws. This eliminates the need for complicated work such as mounting brackets and penetrating bolts from these brackets, and eliminates the need for forming through holes with sleeves and fixing the ducts with mortar, as in the past. Along with the use, the work of arranging the duct can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which connection between an actual pipe duct penetrating a beam concrete of a skeleton and an extension duct arranged outside the same is completed in one embodiment of a method of connecting an actual pipe duct according to the present invention. FIG.

FIG. 2 is a perspective view showing a state in which a connecting fitting is attached to an actual pipe duct used in the embodiment.

FIG. 3 is a cross-sectional view showing a state in which an actual pipe duct to which a connection fitting is attached is set in a beam formwork in the embodiment.

FIG. 4 is an explanatory view showing a step of connecting and fixing an extension duct to an end of an actual pipe duct exposed on a side surface of a beam concrete in the embodiment.

FIG. 5 is an explanatory view showing a conventional construction method in which a spiral duct is penetrated and fixed to skeleton concrete and connected to a spiral duct for extension in the order of steps.

FIG. 6 is an explanatory view showing a conventional connection method when an actual pipe duct is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Beam concrete (body concrete) 2 Actual pipe duct 3 Extension duct 4 Insertion joint 5 Connection metal fitting 5b Projection end part 6,7 Screw (fixing means) 8 Beam part formwork (formwork)

Claims (1)

[Claims] 1. A required number of connecting fittings project from both ends of an actual pipe duct, and both ends of the actual pipe duct are bent in a state where the protruding ends of the connecting fittings are bent toward the inner peripheral side of the actual pipe duct. Is fixed to a predetermined location on the inner surface of the formwork, and after the slab concrete poured into the formwork hardens and dismantles and removes the formwork, the connecting fitting is moved outward from both ends of the actual pipe duct. An extension duct is connected to both ends of the actual pipe duct through insertion joints, and a projecting end of the connection fitting is fixed to the extension duct via fixing means. Connection method.