JP2018071159A - Duct construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the period of duct construction, reduce cost including a pedestal expense, and reduce space necessary for duct construction while improving duct fire resistance, durability, and quality.SOLUTION: A precast duct material 10 in which a concrete outer peripheral wall 12 is integrally formed on the outer peripheral side of a cylindrical duct component material 11 is first formed, then the precast duct material 10 is lifted to the installation position of a duct construction place of a building, and the lifted precast duct material 10 is fixed to the building frame 2 of the building.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a duct construction method for constructing a duct in a building such as an apartment house or a commercial facility.

As the above-described duct construction method, for example, in the construction method of a reinforced concrete building disclosed in Patent Document 1, a frame block material in which a column and a beam of a reinforced concrete structure including columns and beam joints are integrated is formed in advance. This frame block material is joined to the reinforced concrete column of the lower level frame block material and the reinforced concrete beam of other frame block material of the same level to construct the frame frame, and the floor slab above the reinforced concrete beam of this frame frame Laying block material to build the frame.
The floor slab block material is formed of a precast plate (PCa plate) that covers the entire grid of grids partitioned by reinforced concrete beams. The floor slab block material is preinstalled with air conditioning ducts and ceiling base materials. Yes.

  However, the above construction method only discloses that the air conditioning duct is attached in advance to the floor slab block material made of PCa plate, and does not describe the specific structure and construction method of the air conditioning duct. Therefore, it cannot cope with construction of a duct that requires fire resistance.

  Therefore, as a method of constructing a duct that requires fire resistance, for example, when constructing a smoke duct for ventilation in the frame of a blow-off part of a building, a steel foundation is installed at the duct construction location of the frame for which the frame work has been completed. A steel base construction for mounting the steel, an ALC wall construction that attaches a lightweight cellular concrete wall (ALC wall), which forms a duct installation space between the walls of the frame, to the steel base, and a fireproof construction that applies a fireproof coating to the steel base A duct construction method for performing duct work for arranging a duct in the duct installation space is conceivable.

JP-A-8-302812

The above-described duct construction method secures, in addition to the duct arrangement space, an ALC wall arrangement space that forms a duct mounting space with the wall surface of the housing, and a space for constructing a total scaffold in the atrium of the building. There is a need. In addition, the construction of scaffolding within the atrium is required. For this reason, not only the quantity of temporary materials but also the amount of work for carrying in / out and overloading increases.
In addition, since the steel foundation work, ALC wall work, fireproof coating work, and duct work are executed after the completion of the frame work, the construction period including the duct work is likely to be prolonged and the cost is likely to rise.

  In view of this situation, the main problems of the present invention are to simplify the structure, shorten the construction period including duct construction, reduce the cost including overhead cost, and install the duct while ensuring the fire resistance, durability and quality of the duct. The object is to provide a duct construction method capable of reducing space.

  A first characteristic configuration according to the present invention is a duct construction method, in which a precast duct material in which a concrete outer peripheral wall is integrally formed on an outer peripheral side of a cylindrical duct constituent material is manufactured in advance, and then the precast duct material is built. The precast duct material is lifted to the installation position of the duct construction site and the lifted precast duct material is fixed to the building frame.

  According to the said structure, a duct is comprised with the duct material of a single layer structure by making a duct material into the multilayer structure of the cylindrical duct component material and the concrete outer peripheral wall integrally formed in the outer peripheral side of it. Compared to the case, it is possible to ensure the fire resistance and durability of the duct while simplifying the structure.

  Moreover, since this duct material is precast (PCa) and manufactured in advance, the manufactured precast duct material is lifted to the installation position of the duct construction site of the building, and this lifted precast duct material is used in the building. You just need to fix it to the housing. Therefore, it is possible to reduce the steel foundation work, ALC wall work, fireproof covering work in the duct construction method after the completion of the above-mentioned frame work, and the amount of temporary materials and the amount of work for carrying in / out and overloading, Space can be reduced.

  Therefore, by adopting PCa with a multi-layered duct structure, while ensuring fire resistance, durability, and quality, shorten the construction period including duct construction, reduce costs including overhead costs, and reduce the space required for duct construction. Can do.

  A second characteristic configuration according to the present invention is that a vertical duct is constructed at a duct construction location of the building by sequentially stacking the precast duct material in the vertical direction while being fixed to the structural body.

According to the said structure, a precast duct material and a housing can be fixed firmly, and a precast duct material can be piled up one by one in the vertical direction in the stable state, and a coffin duct can be constructed | assembled. In addition, it is possible to adopt a construction method in which the precast duct material is stacked in the vertical direction sequentially while fixing the frame work as the frame work progresses, and the frame work and the duct work can be completed almost simultaneously. it can.
Therefore, the construction period can be further shortened as compared with the duct construction method after the completion of the above-described frame construction.

  According to a third characteristic configuration of the present invention, the subsequent precast duct material lifted to the installation position of the duct construction place is compressed in a compressed state between the joint surfaces of the installed precast duct material. It is in the point piled up in the state of arrangement.

  According to the said structure, between the joint surfaces of the piled up both precast duct materials can be reliably sealed with the packing arrange | positioned in the compression state, and the airtightness of a gutter duct can be improved.

  The 4th characteristic structure by this invention exists in the point by which the one side part of the said concrete outer peripheral wall of the said precast duct material is comprised by the wall part which comprises a part of said housing after construction.

  According to the above configuration, the dredging duct work can be completed for each level in accordance with the frame construction, and a part of the frame is constructed after construction with one side part of the precast duct material made of PCa. The material and the casing can be firmly fixed by integration, and the construction period of the casing construction and the duct construction can be shortened.

  A fifth characteristic configuration according to the present invention includes a portion corresponding to the wall portion in the joint surface of the preceding precast duct material installed at the installation position of the duct construction location, and a joint surface of the subsequent precast duct material. By filling grout between the portions corresponding to the wall portions, the wall portion of the preceding precast duct material and the wall portion of the subsequent precast duct material are fixed.

  According to the above configuration, among the two precast duct materials stacked, the wall portions constituting a part of the housing can be firmly fixed with a grout after the construction, so that the precast duct materials are in an appropriate relative posture. It can be securely and firmly fixed over a long period of time.

Horizontal cross-sectional view of the seismic wall and the duct of the building that make up the atrium of the building Horizontal sectional view during production of precast duct material Side view of vertical section of precast duct material for one section when lifting Longitudinal side view during lifting of precast duct material for two nodes Horizontal sectional view (a) and longitudinal sectional side view (b) showing packing arrangement at the time of lifting and joining of precast duct material Longitudinal side view when installing precast duct material for two nodes Horizontal sectional view (a) and vertical side view (b) showing packing arrangement at the completion of joining of both precast duct materials Horizontal sectional view when installing half precast wall Perspective view of half precast wall Side view when installing pipes on the manufactured half precast wall

[First Embodiment]
FIG. 1 shows a part of a center core structure that constitutes a substantially central part of a building such as an apartment house or a commercial facility. Inside the center core structure, equipment such as elevators, stairs, tower parking, machine room, and piping are collectively arranged, and a common corridor, a living space, and the like are formed around the center core structure.
In the present embodiment, a saddle duct 4 that is an example of a duct is constructed at a duct construction location of a seismic wall (core wall) 3 of a housing 2 that defines and forms a blow-off portion 1 in which tower parking or the like is installed. The saddle duct 4 is constructed by sequentially stacking the precast duct material 10 produced in advance in a PCa production site such as a PCa factory or a PCa production site in the longitudinal direction while fixing the precast duct material 10 to the duct construction position of the enclosure 2.

Each of the precast duct members 10 constituting the 竪 duct 4 is made of a metal (for example, hot-dip galvanized steel plate) duct component member 11 made of a rectangular tube having a rectangular cross-sectional shape, and a duct component member 11 thereof. It consists of a concrete outer peripheral wall 12 made of reinforced concrete that is integrally formed so as to surround the outer peripheral side.
Of the first concrete side wall portion 12A to the fourth concrete side wall portion 12D constituting the four side surfaces of the concrete outer peripheral wall 12, one side surface (one side portion) of the first concrete side wall is integrally formed with the seismic wall 3 of the frame 2. The portion 12A is configured to have a thickness larger than the thickness of the earthquake-resistant wall 3 of the casing 2. The second concrete side wall portion 12 </ b> B to the fourth concrete side wall portion 12 </ b> D constituting the remaining three side surfaces are integrally configured to have a thickness smaller than the thickness of the earthquake resistant wall 3.

  As shown in FIGS. 8 to 10, another part of the earthquake-resistant wall 3 is a half-precast wall (for example, an omnia version) 40 manufactured in advance with the top side of the truss bar 41 exposed. The seismic wall 3 is constructed by lifting, fixing and fixing the concrete on site. As shown in FIG. 10, a predetermined number of pipes P are attached in advance to the inner surface of the half precast wall 40 on the indoor side, and the half precast wall 40 is externally attached to the half precast wall 40 as shown in FIGS. 8 and 10. A separator 42 for attaching the formwork 46 at predetermined intervals is attached in advance.

Next, a duct construction method for constructing the above-described saddle duct 4 will be described.
[1] Manufacturing Process of Precast Duct Material 10 As shown in FIG. 2, a rectangular tube-shaped metal duct constituent member 11 having a rectangular cross section is fixedly disposed as an inner mold frame in the PCa manufacturing site. On the outer peripheral surface 11a side of the duct component member 11, a plurality of duct vertical bars 13A and duct strips 13C along the duct axial direction, and a plurality of duct transverse bars 13B connected to the wall connecting bars 44 of the earthquake-resistant wall 3 are provided. Arrange the bars. A concrete mold as the outer mold 15 is fixedly arranged at the outer position of the bar arrangement. The interval between the inner surface 15a of the outer mold 15 and the outer peripheral surface 11a of the duct component 11 is regulated to a set interval corresponding to each thickness of the first concrete side wall portion 12A to the fourth concrete side wall portion 12D in the concrete outer peripheral wall 12. To do.
In this state, concrete is placed in the molding space between the outer peripheral surface 11 a of the duct component member 11 and the inner surface 15 a of the outer mold 15. By removing the outer mold 15 after curing the cast concrete, the precast duct material 10 in which the concrete outer peripheral wall 12 is integrally formed on the outer peripheral surface 11a of the metal duct component 11 can be manufactured.

In this embodiment, as shown in FIGS. 3 and 4, a grout-filled reinforcing bar joint sleeve 13 </ b> E such as mortar is provided at the lower end portion of the duct vertical bars 13 </ b> A arranged on the first concrete side wall 12 </ b> A. ing. At the upper end of the duct vertical bars 13A arranged on the first concrete side wall part 12A, the concrete outer peripheral wall with a connection allowance that can be inserted and connected from the duct axial direction to the reinforcing bar joint sleeve 13E of the precast duct material 10 on the upper floor side. 12 is formed with a connecting bar portion 13a protruding from the upper end surface 12b of the twelve.
As shown in FIGS. 3 and 4, the floor slab 5 on the installation floor on which the one-section precast duct material 10 is installed and fixed is located from the duct axial direction with respect to the reinforcing bar joint sleeve 13 </ b> E of the one-section precast duct material 10. A connecting bar portion 13 </ b> F that protrudes from the upper surface 5 a of the floor slab 5 with a connection allowance for insertion is provided.

Further, in the present embodiment, as shown in FIGS. 1 and 2, both the left and right sides of the first concrete side wall 12A are connected to the both ends of the duct transverse bar 13B at the connection margin with the wall connecting bar 44 of the seismic wall 3. A connecting bar portion 13b protruding from the outer surface is formed.
Moreover, each precast duct material 10 that constructs the eaves duct 4 corresponds to or substantially corresponds to the height from the upper surface 5a of the floor slab 5 on the installation floor to the upper surface 5a of the floor slab 5 on the upper floor, as shown in FIG. The corresponding height is set.

[2] Lifting / Installation Process of One-Section Precast Duct Material 10 As shown in FIG. 3, a suspension bolt 16 is attached to the upper end of the one-cast precast duct material 10, and the precast duct material 10 is installed on the installation floor with a tower crane or the like. The floor slab 5 is lifted and fixed to a duct forming portion on the upper surface 5a. In the installed and fixed state, the reinforcing bar joint sleeve 13E of the precast duct material 10 is inserted and connected to the connecting bar portion 13F protruding from the upper surface 5a of the floor slab 5 from the duct axial direction. The reinforcing bar joint sleeve 13E of the precast duct material 10 and the connecting bar part 13F on the floor slab 5 side are fixed by a grout filled in the reinforcing bar joint sleeve 13E.

  Further, as shown in FIG. 5 and FIG. 7, an installation precedent (between the upper surface 5 a of the floor slab 5 on the installation floor and the lower end surface 12 a of the concrete outer peripheral wall 12 of the one-step precast duct material 10 is installed. A sealing joint structure for hermetically joining a joint surface between the upper end surface 12b of the concrete outer peripheral wall 12 of the precast duct material 10 on the lower floor and the lower end surface 12a of the concrete outer peripheral wall 12 of the subsequent precast duct member 10 on the upper floor; The same or substantially the same sealed joint structure is configured. Therefore, the sealing joint structure between the joint surfaces of the floor slab 5 on the installation floor and the one-step precast duct material 10 will be described in detail in the sealing joint structure between the joint surfaces of both precast duct members 10 described later.

  Next, as shown in FIGS. 1 and 8, a half precast wall 40 manufactured at the PCa manufacturing site is lifted and installed at the adjacent earthquake resistant wall construction position of the precast duct material 10. The bar connecting bar 44 and the wall vertical bar 45 are arranged on the exposed side of the truss bar 41 of the half precast wall 40, and the wall connecting bar 44 and the precast duct member 10 on the half precast wall 40 side are arranged. The wall connecting bar 44 is connected. Thereafter, a concrete mold as an outer mold 46 is attached to a separator 42 provided in advance on the half precast wall 40, and a molding space formed by the half precast wall 40, the precast duct material 10 and the outer mold 46 is formed. Concrete 47 is placed.

  With the curing of the cast concrete 47, the construction of the earthquake resistant wall 3 using the half precast wall 40 is completed, and at the same time, the first concrete side wall 12A on one side of the concrete outer peripheral wall 12 of the precast duct material 10 is It becomes the wall portion 3 </ b> A constituting a part of the seismic wall 3 of the frame 2. As shown in FIG. 1, the wall portion 3 </ b> A for the seismic wall structure is a region corresponding to at least an extension line between the indoor side wall surface 3 a and the outdoor side wall surface 3 b of the earthquake resistant wall 3 in the first concrete side wall portion 12 </ b> A. It is configured with. Therefore, the dredging duct work can be completed for each level in accordance with the frame construction, and the seismic wall 3 of the frame 2 after the construction with the first concrete side wall 12A which is one side part of the precast duct material 10 made of PCa. As part of the construction, the efficiency of the frame construction can be improved.

[3] Lifting / Installation Process of Precast Duct Material 10 in Section 2 As shown in FIG. 4, when installation of the precast duct material 10 in section 1 is completed, concrete is placed on top of the precast duct material 10 on site. Then, the side wall 18 that defines the branch duct outlet 17 is formed, and the upper floor beam 6 and the floor slab 5 are installed.
Thereafter, the suspension bolt 16 is attached to the upper end portion of the two-node precast duct material 10, and the two-node precast duct material 10 is attached to the upper end portion of the one-node precast duct material 10, which is the installation position of the next duct construction site. Lift and fix to the part. In the installed and fixed state, the reinforcing bar joint sleeve 13E of the two-stage precast duct material 10 on the upper floor is projected from the upper end surface 12b of the one-node precast duct material 10 on the lower floor that has been previously installed and fixed. It is fitted and connected to the connecting bar portion 13a of 13A from the duct axial direction.
The reinforcing bar joint sleeve 13E of the upper floor precast duct material 10 and the connecting bar portion 13a of the lower floor precast duct material 10 are fixed by a grout filled in the reinforcing bar joint sleeve 13E.

The upper end surface 12b of the precast duct material 10 on the lower floor, which is installed and fixed, and the lower end surface 12a of the precast duct material 10 on the upper floor are joined with a hermetic joint structure. As shown in FIG. 7, this sealed joint structure is provided with a packing 30 for sealing between the joint surfaces of the two precast duct members 10. The packing 30 is composed of a first packing member 30A to a fifth packing member 30E having a maximum of five layers in the duct inner and outer directions.
The first packing member 30 </ b> A located on the innermost side is composed of a smoke exhaust packing arranged in a rectangular ring shape in contact with the end surface of the duct component member 11 in the duct axial direction.
The second packing member 30B located second from the innermost side is made of butyl rubber arranged in a rectangular ring shape in contact with the outer surface of the rectangular ring-shaped first packing member 30A.
The third packing member 30C located third from the innermost side is an outer surface located in the joining region of the second concrete side wall part 12B to the fourth concrete side wall part 12D among the outer side faces of the rectangular annular second packing member 30B. The chloroprene rubber is arranged in a U shape in contact with the chloroprene rubber.
The fourth packing member 30D located fourth from the innermost side is made of rock wool arranged in a U shape in contact with the outer surface of the third packing member 30C.
5th packing member 30E located in the outermost side is comprised from the caulking material with which it fills between the outer side joining surfaces of 4th packing member 30D in the joining area | region of 2nd concrete side wall part 12B-4th concrete side wall part 12D. Has been.

Further, in the sealed joint structure of the present embodiment, as shown in FIG. 7, a grout 31 is provided on the outer side portion of the second packing member 30 </ b> B between the joint surfaces of the first concrete side wall portions 12 </ b> A of both precast duct members 10. Is filled. By solidifying the filled grout 31, the wall portion 3A for the seismic wall structure constituted by the first concrete side wall portion 12A of the precast duct material 10 on the lower floor and the first concrete side wall of the precast duct material 10 on the upper floor. The wall portion 3A for the seismic wall construction constituted by the portion 12A is fixed integrally.
And since both wall parts 3A which comprise a part of earthquake-resistant wall 3 of the housing 2 after construction among the two precast duct materials 10 piled up in the vertical direction can be firmly fixed with the grout 31, the precast duct material 10 can be firmly and firmly fixed to each other in an appropriate relative posture over a long period of time.

Moreover, as shown in FIGS. 5 and 7, a plurality of locations (four locations in the present embodiment) of the lower end surface 12a of the concrete outer peripheral wall 12 of each precast duct material 10, that is, the fourth packing member 30D made of rock wool. Both the precast ducts are brought into contact with the upper end surface 12b of the concrete outer peripheral wall 12 of the precast duct material 10 on the lower floor side at the center position of each side in the arrangement area and the center position in the filling area of the grout 31. A gap adjusting bolt 35 which is an example of a gap adjusting means for restricting the gap 34 between the joining surfaces of the material 10 to a set interval is screwed and attached.
When the upper floor precast duct material 10 lifted on the lower floor side precast duct material 10 is placed, the plurality of gap adjusting bolts 35 are provided with the first packing member 30A to the third packing member in the packing 30. 30C is regulated to a set interval at which the compression state is appropriate.
And as above-mentioned, since the clearance gap 34 between joining surfaces is reliably maintained by the setting space | interval in both the precast duct materials 10 with the some clearance adjustment bolt 35, the 1st packing member 30A-the 3rd packing member in the packing 30 is maintained. 30C can be maintained in a proper sealed condition.
Furthermore, by horizontally adjusting the plurality of gap adjusting bolts 35, the precast duct members 10 can be stacked with high accuracy in the vertical direction.

  In addition, as shown in FIG.4, FIG.5, FIG.7, among the lower end surface 12a and the upper end surface 12b of the concrete outer peripheral wall 12 of both the precast duct materials 10, of 2nd concrete side wall part 12B-4th concrete side wall part 12D. Positioning mounting grooves 32 and 33 into which the upper side and lower side of the third packing member 30C made of chloroprene rubber are fitted and mounted are formed at portions corresponding to the joining region.

Next, the construction procedure of the above-described sealed joint structure will be described.
When the upper floor side precast duct material 10 is lifted to the upper end portion of the lower floor side precast duct material 10 that has been previously installed and fixed, the concrete of the lower floor side precast duct material 10 is omitted although illustration is omitted. A first packing member 30 </ b> A to a third packing member 30 </ b> C are arranged in advance on the upper end surface 12 b of the outer peripheral wall 12. At this time, the lower side portion of the third packing member 30C is fitted and mounted in a mounting groove 33 formed on the upper end surface 12b of the concrete outer peripheral wall 12 of the precast duct material 10 on the lower floor side.
In the state where the upper floor side precast duct material 10 is installed and fixed to the upper end portion of the lower floor side precast duct material 10, the upper portion of the third packing member 30C is the concrete outer peripheral wall of the upper floor side precast duct material 10 12 is fitted and mounted in the mounting groove 32 formed in the lower end surface 12a of the twelve lower end surface 12a, so that the displacement of the first packing member 30A to the fourth packing member 30D can be suppressed.
Then, the caulking material which comprises the 5th packing member 30E is filled between the joint surfaces of the 4th packing member 30D in the outer side in the joining area | region of 2nd concrete side wall part 12B-4th concrete side wall part 12D. Further, the grout 31 is filled in the outer side portion of the second packing member 30B between the joint surfaces of the first concrete side wall portions 12A of the two precast duct members 10.

  In addition, the sealing joint structure and construction procedure between the joint surfaces of the floor slab 5 of the installation floor and the precast duct member 10 of the passage are the same as the above-described sealed joint structure and construction procedure between the joint surfaces of the two precast duct members 10. is there.

FIG. 9 is a production explanatory view of the half precast wall 40 constituting the earthquake resistant wall 3 in the PCa production site. In the present embodiment, a truss bar 41, a separator 42, and the like are arranged in a horizontal mold corresponding to the half precast wall 40, and a mounting bracket (not shown) for mounting the support bracket 50 of the pipe P is provided. Is placed in an insert state, and concrete 48 is placed in a state where the top side of the truss bar 41 and one end side of the separator 42 are exposed.
In this PCa manufacturing site, a positioning ruler 49 that is engaged with the upper ends of the plurality of separators 42 of the half precast wall 40 is attached.

  As shown in FIG. 10, the manufactured half precast wall 40 is held in a vertical posture at a predetermined height position from the floor surface of the PCa production site, and the mounting bracket 50 inserted into the half precast wall 40 is supported by the support bracket 50. Are fixedly connected, and a pipe P such as a collecting water pipe is attached to the support fitting 50. The pipe P protrudes below the lower end of the half precast wall 40 by a predetermined length, and when it is lifted to the earthquake-resistant wall construction site, a pipe hole (not shown) formed in the floor slab 5 of the earthquake-resistant wall construction site. The lower projecting pipe portion of each pipe P is inserted into

[Other Embodiments]
(1) In the above-described embodiment, in the PCa production site, concrete is placed using the cylindrical metal duct constituent member 11 as the outer peripheral surface 11 a as the inner mold frame, and the concrete is applied to the outer peripheral surface 11 a of the duct constituent member 11. Although the precast duct material 10 in which the outer peripheral wall 12 is integrally formed is manufactured, it is not limited to this configuration. For example, in the PCa production site, the outer peripheral side of the cylindrical metal duct constituent member 11 is manufactured in advance in a size corresponding to each side surface of the concrete outer peripheral wall 12 or duct constituent member 11 manufactured in advance in a cylindrical shape. Alternatively, the concrete outer peripheral wall 12 having a divided structure may be integrally mounted with a mounting bracket.

  (2) In the above-described embodiment, the first concrete side wall portion 12A that is one side portion of the PCa precast duct material 10 is used to configure a part of the wall portion 3A of the seismic wall 3 of the housing 2 after construction. However, the present invention is not limited to this configuration. For example, a part of the wall portion 3A of the seismic wall 3 of the housing 2 may be configured after construction by using the concrete side wall portions of two orthogonal sides (two side portions) of the precast duct material 10.

  (3) In the above-described embodiment, the upper end surface 12b of the lower floor precast duct material 10 which is fixedly installed and the lower end surface 12a of the upper floor precast duct material 10 have a maximum of 5 in the duct inside / outside direction. Although composed of the packing 30 as a layer, it may be composed of a single packing 30 or a plurality of packings 30 other than five layers.

  (4) In the above-described embodiment, the precast duct material 10 is fixed to the housing 2 and stacked in the vertical direction in order to construct the firewood duct 4 at the duct construction location of the building. You may construct | assemble a horizontal duct in the duct construction location of a building by joining sequentially in the horizontal direction, fixing.

  (5) In the above-mentioned embodiment, although the one side part of the concrete outer peripheral wall 12 of the precast duct material 10 illustrated the form comprised by the wall part 3A which comprises some housings 2 after construction, this invention Includes a form in which one side portion of the concrete outer peripheral wall 12 of the precast duct material 10 does not constitute a part of the housing 2 after construction.

(6) In the above-described embodiment, when the precast duct material 10 is converted to PCa, the entire concrete outer peripheral wall 12 including the wall portion 3A constituting a part of the earthquake-resistant wall 3 of the housing 2 after construction is completed or substantially completed. Although prefabricated, this precast duct material 10 may be composed of half precast. For example, one side surface (one side) of the first concrete side wall portion 12A to the fourth concrete side wall portion 12D constituting the four side surfaces of the concrete outer peripheral wall 12 of the precast duct material 10 that is integrally formed with the earthquake resistant wall 3 of the casing 2. Part) of the first concrete side wall 12A is manufactured with a thickness smaller than the set thickness in a state where the reinforcing bars such as truss bars and the separator for attaching the formwork are exposed.
And the concrete formwork as a formwork is attached to the separator previously provided in the precast duct material 10 of the half precast lifted and installed in the duct construction position. In addition, a concrete formwork as an outer formwork 46 is attached to a separator 42 provided in advance on a half precast wall 40 that is lifted and installed at the seismic wall construction position. Concrete is cast in this state, and the culvert duct 4 and the earthquake-resistant wall 3 are constructed integrally.

2 Housing 3A Wall 4 Duct
DESCRIPTION OF SYMBOLS 10 Precast duct material 11 Duct component 12 Concrete outer peripheral wall 30 Packing 31 Grout

Claims (5)

  After the precast duct material in which the concrete outer peripheral wall is integrally formed on the outer peripheral side of the cylindrical duct component material is manufactured in advance, the precast duct material is lifted to the installation position of the duct construction location of the building and lifted. A duct construction method for fixing a precast duct material to the building frame.   The duct construction method according to claim 1, wherein the precast duct material is sequentially stacked in a vertical direction while being fixed to the housing, thereby constructing a duct duct at a duct construction location of the building.   The subsequent precast duct material lifted to the installation position of the duct construction site is stacked in a state in which packing is arranged in a compressed state between the joint surfaces with the installed previous precast duct material. 2. The duct construction method according to 2.   The duct construction method according to claim 2 or 3, wherein one side portion of the concrete outer peripheral wall of the precast duct material is configured as a wall portion that constitutes a part of the frame after construction.   Between the part corresponding to the wall part in the joint surface of the preceding precast duct material installed at the installation position of the duct construction part and the part corresponding to the wall part in the joint surface of the subsequent precast duct material The duct construction method according to claim 4, wherein the wall portion of the preceding precast duct material and the wall portion of the subsequent precast duct material are fixed by filling grout into the wall.

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