Method of installing spandrel wall of steel structure and spandrel wall installation structure

Abstract

To provide an installation method of a spandrel wall of a steel frame structure and a spandrel wall installation structure, easy in construction, and constructible with high accuracy without depending on skill of a worker.SOLUTION: The installation method of the spandrel wall includes an arrangement process S1, a filling process S2, and a fitting process S3, and in the fitting process S3, the height of the upper surface 20b of the two spandrel walls 20 and / or the clearance of the wall surface 20a can be adjusted by using a fitting member 40 as a ruler material. A spandrel wall installation structure 1 of a steel structure according to the present invention includes footing beams 10 in which a plurality of joint bars 11 protrude upward at predetermined intervals along a longitudinal direction of an upper surface, two spandrel walls 20 disposed on the footing beams 10 in a state in which one joint bar 11 is interposed between sides, a filling material 30 filled between side joints of the two spandrel walls 20, and a long fitting member 40 having a substantially U-shaped cross section fitted to upper portions of the two spandrel walls 20 across a 20d between the two spandrel walls 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and structure for installing a spandrel wall in a steel frame structure, and more particularly to a method and structure for installing a spandrel wall in a steel frame structure that is easy to install and can be installed with high precision without relying on the skill of the workers. [Background technology]

[0002] Steel-framed structures (S-frame construction) are used in large structures such as logistics warehouses and factories, as they can secure large spaces using steel columns and beams. The exterior walls of steel-framed structures are constructed by (1) building forms on the site, pouring concrete, and installing foundation beams, (2) backfilling the base of the foundation beams, (3) erecting the steel frame, (4) building forms on the foundation beams, pouring concrete, and installing spandrel walls, (5) fastening furring strips to the spandrel walls and steel frame, and (6) attaching exterior wall materials to the furring strips. Patent Document 1 discloses a method of installing a spandrel wall in which anchor bolts embedded in the upper part of the spandrel wall are fixed to the furring strips via fixing members with multiple locking structures, thereby absorbing installation errors of the anchor bolts. Non-Patent Document 1 discloses a method of installing a spandrel wall in which precast concrete spandrel walls (hereinafter referred to as "PC spandrel walls") are placed continuously on foundation beams, rather than being cast in place, and adjacent spandrel walls are connected with plates at the top edge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-39064 [Non-patent literature]

[0004] [Non-Patent Document 1] "Waist wall PC construction method", Sando Kogyo Co., Ltd., [online], [Retrieved June 24, 2024], Internet,<URL:https: / / www.sandou-k.jp / pc / pdf / case01 / detail.pdf?210428> Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional technology has the following problems. <1> In terms of the construction process, the installation of the spandrel wall comes after the erection of the steel frame, so when the concrete for the spandrel wall is poured, the steel frame is erected close to the back of the spandrel wall. This means that the assembly of the formwork and the pouring of concrete must be carried out in the narrow space in front of the steel frame, which makes the work complicated and may have a negative impact on the construction quality. <2> After backfilling the foundation beams, it takes about a month to erect the steel frame before pouring the concrete for the spandrel walls. During this time, rebar and formwork workers are put on hold and have to be temporarily diverted to other sites, resulting in inefficient labor allocation and increased labor costs. <3> Since adjacent prestressed concrete waist walls are only partially connected by plates at the top edge, the wall surface lines (hereinafter referred to as "alignments") of adjacent waist walls are prone to misalignment, and the accuracy of the alignment construction varies depending on the skill of the workers, which can easily lead to variations in construction quality.

[0006] An object of the present invention is to provide a method for installing a spandrel wall of a steel structure and a spandrel wall installation structure in order to solve the problems of the prior art as described above. [Means for solving the problem]

[0007] The method for installing waist walls of a steel frame structure of the present invention comprises an arrangement step in which two waist walls are placed on a foundation beam having a plurality of insert bars protruding upward from the top surface at a predetermined interval along the longitudinal direction, with one insert bar sandwiched between the side edges of the two waist walls; a filling step in which filler material is filled between the side edges of the two waist walls; and an engagement step in which a long engaging member with a roughly U-shaped cross section is fitted to the top of the two waist walls so as to straddle the two waist walls, and is characterized in that in the engagement step, the engaging member acts as a ruler to make it possible to adjust the height of the top surfaces of the two waist walls and / or the alignment of the wall surfaces.

[0008] In the waist wall installation structure of the present invention, the waist wall has a groove that is continuous in the height direction of the side edge, and in the placement process, the grooves of the two waist walls define a storage space for accommodating the inserted reinforcement bars, and in the filling process, filler material is filled into the storage space.

[0009] The method for installing a waist wall of a steel structure of the present invention may involve the waist wall having a bolt insert embedded in the upper part of the wall surface, the fitting member having a bolt hole connecting the side plates, and in the fitting process, the fitting member being bolted to the waist wall by threading a connecting bolt inserted into the bolt hole into the bolt insert.

[0010] The waist wall installation structure for a steel frame structure of the present invention is a waist wall installation structure for a steel frame structure, characterized by comprising a foundation beam with a plurality of insert bars protruding upward at predetermined intervals along the longitudinal direction of the top surface, two waist walls arranged on the foundation beam with one insert bar sandwiched between their side edges, filler material filled between the side edges of the two waist walls, and a long fitting member with an approximately U-shaped cross section that spans the joints between the two waist walls and fits into the top of the two waist walls.

[0011] The waist wall installation structure of the steel frame structure of the present invention may be such that the waist wall has a protruding portion that protrudes outward from the upper edge of the wall surface, and the engaging member has a locking portion that protrudes inward from the lower edge of the side panel, and the locking portion is locked to the lower part of the protruding portion.

[0012] In the spandrel wall installation structure for a steel frame structure of the present invention, the length of the fitting member may be equal to the width of the spandrel wall. [Effects of the Invention]

[0013] The method and structure for installing a spandrel wall in a steel structure according to the present invention has at least one of the following advantages over the above structure. <1> The precast concrete spandrel wall can be installed by simply placing it on the foundation beams, filling the joints with filler, and fitting the fitting parts. This means that skilled workers are not required, and construction can be carried out by a small number of people in a short period of time. In addition, because there is no need to set up formwork, construction can be easily carried out even in the narrow work space after the steel frame has been erected. <2> Because it is a dry construction method and the work is easy, construction can be done with just steel frame work, without the need for rebar work and formwork. This means that construction can be carried out continuously from erecting the steel frame with steel frame work, and after backfilling the foundation beams, the rebar work and formwork can be freed up and diverted to other sites. This allows for efficient allocation of labor and significantly reduces labor costs. <3> By fitting the fitting member, which also serves as a ruler, across the joints of the spandrel walls, the height and alignment of the successive spandrel walls can be mechanically aligned. This makes it possible to install spandrel walls with high construction precision, without relying on the skill of the workers. [Brief explanation of the drawings]

[0014] [Figure 1] Illustration of the waist wall installation structure [Figure 2] Illustration of the waist wall [Figure 3] Explanatory diagram of fitting member [Figure 4] Flow chart of how to install a waist wall [Figure 5A] Layout process diagram [Figure 5B] Explanation of the filling process [Figure 5C] Explanation of the fitting process [Figure 5D] Explanation of the connection process DETAILED DESCRIPTION OF THE INVENTION

[0015] The method and structure for installing a spandrel wall in a steel structure of the present invention will be described in detail below with reference to the drawings. In this specification, the terms "up," "down," "front," "rear," "side," and other directional terms refer to the respective directions when the spandrel wall is viewed from the front, facing from the outdoor side to the indoor side of the steel structure. [Example]

[0016] <1> Waist wall installation structure (Fig. 1) A spandrel wall-installed structure 1 for a steel frame structure (hereinafter referred to as "spandrel wall-installed structure 1") of the present invention is a spandrel wall structure in a steel frame structure (S construction) such as a distribution warehouse or a factory. The spandrel wall installation structure 1 comprises at least a foundation beam 10, a plurality of spandrel walls 20 installed on the foundation beam 10, filler material 30 filled between adjacent spandrel walls 20, and fitting members 40 fitted to the upper parts of the adjacent spandrel walls 20 across the joints between the adjacent spandrel walls 20. Furring strips 50 are installed on the fitting members 40 and connected to the fitting members 40. The exterior wall of the steel structure A is formed by attaching exterior wall materials to the furring strips 50 of the spandrel wall installation structure 1. The waist wall installation structure 1 has a feature in that it ensures high construction precision by regulating the height and position of the waist wall 20, which is placed continuously on the foundation beam 10, with a long fitting member 40.

[0017] <2> Foundation beam (Figure 1) The foundation beam 10 is a foundation that supports the spandrel wall 20. The foundation beam 10 is made of a continuous concrete foundation with reinforcing bars arranged inside, and extends along the outer wall of the steel structure A. A plurality of insert bars 11 protrude upward from the upper surface of the foundation beam 10 at predetermined intervals along the longitudinal direction of the foundation beam 10.

[0018] <3> Waist wall (Figure 2) The spandrel wall 20 is a basic structural member of the exterior wall in a steel-framed building. The spandrel wall 20 is made of a precast concrete panel that is rectangular in front view and has reinforcing bars arranged inside, and has front and rear wall surfaces 20a, an upper surface 20b, a lower surface 20c, and left and right side edges 20d. In this example, the waist wall 20 further includes a protrusion 21 provided on the upper edge of the front wall surface 20a, a recessed groove 22 that continues in the height direction of the side edge 20d, and a plurality of bolt inserts 23 embedded in the upper part of the rear wall surface 20a. However, the structure of the waist wall 20 is not limited to this, and it may be, for example, a flat plate structure without the protrusion 21. The spandrel walls 20 are arranged continuously in the width direction on the foundation beams 10, and the insert bars 11 are sandwiched between adjacent spandrel walls 20.

[0019] <3.1>Protrusion The protrusion 21 is a projection that prevents the fitting member 40 from slipping out. The protrusion 21 is formed by protruding outward from the upper edge of the wall surface 20a. In detail, for example, at the upper edge of the front wall surface 20a, a certain range from the top end is protruded outward by several tens of millimeters, and an inclined surface connects the front surface of the wall surface 20a and the front surface of the protrusion 21, forming an inverted trapezoidal shape when viewed from the side. However, the structure of the protrusion 21 is not limited to this, and the protrusion 21 may be provided on the wall surface 20a on the rear surface instead of the front surface, or on both the front and rear surfaces. Also, the front surface of the wall surface 20a and the front surface of the protrusion 21 may be connected by a horizontal surface instead of an inclined surface.

[0020] <3.2> Groove The recessed groove 22 is a groove for accommodating the insert bars 11 and the filler material 30. The recessed grooves 22 are continuous vertically along the left and right side edges 20d of the waist wall 20. In this example, a U-shaped groove is used as the recessed groove 22. However, the recessed groove 22 is not limited to a U-shaped groove, and may be an inverted trapezoidal groove, an inverted triangular groove, or the like. By butting the side edges 20d of two adjacent waist walls 20 together, a cylindrical storage space 22a is formed that vertically communicates between the waist walls 20 via the opposing recessed grooves 22. Filling material 30 such as dry-mixed mortar is filled into the accommodation space 22a with the insert bars 11 at the center.

[0021] <4> Fittings (Fig. 3) The fitting member 40 is a long member that functions to connect the waist wall 20 and the furring strip 50 and also functions as a ruler during construction. The fitting member 40 has two generally parallel side plates 40a connected by a top plate 40b, and an opening 40c provided between the side plates 40a, forming a generally U-shaped cross section. The width of the opening 40c corresponds to the thickness of the waist wall 20. In this example, the fitting member 40 is made of a bent steel plate, and further includes a locking portion 41 formed on the lower edge of the front side plate 40a, a plurality of connecting portions 42 protruding from the upper surface of the top plate 40b, and a plurality of bolt holes 43 that communicate with the rear side plate 40a. The positions of the bolt holes 43 correspond to the positions of the bolt inserts 23 in the waist wall 20. In this example, the length of the fitting member 40 is made to match the width of the waist wall 20. This increases the contact area between the side plate 40a and the wall surface 20a of the waist wall 20, improving the function of the waist wall 20 as a ruler.

[0022] <4.1> Locking part The locking portion 41 is a structure for locking onto the protruding portion 21 of the waist wall 20. The locking portion 41 protrudes inward from the lower edge of the front side plate 40a. The locking portion 41 is provided at a height that is lower than the protruding portion 21 when the fitting member 40 is fitted into the upper portion of the waist wall 20. The locking portion 41 may be formed, for example, by welding a linear member to the inside of the lower edge of the side plate 40a, or by bending the lower edge of the side plate 40a inward. Furthermore, the locking portion 41 does not need to be provided over the entire length of the fitting member 40, and may be provided partially.

[0023] <4.2>Connection part The connecting portion 42 is a structure for connecting to the furring strip 50. The connecting portions 42 protrude upward from the upper surface of the top plate 40b at predetermined intervals along the longitudinal direction of the fitting member 40. In more detail, for example, bolts that pass through the top plate 40b from the underside thereof and have bolt ends 42a protruding upward can be used as the connecting portions 42. The bolts are welded or glued to the underside of the top plate 40b to prevent them from rotating together when the nuts are screwed in.

[0024] <5> furring strip The furring strips 50 are components for attaching exterior wall materials. Note that the furring strips 50 referred to here are the so-called first furring strips installed on the spandrel wall 20, and are not the furring strips or vertical furring strips above the first furring strips that are attached to the steel frame. In this example, a channel material having a substantially C-shaped cross section is used as the furring strip 50. However, the furring strip 50 is not limited to a channel material, and may be an angle material, a rectangular material, a channel material, or the like. A plurality of connecting holes 51 are provided on the bottom surface of the furring strip 50 at positions corresponding to the connecting portions 42 of the fitting member 40 .

[0025] <6> How to install a waist wall (Figure 4) The method for installing spandrel walls of the present invention comprises at least an arrangement step S1, a filling step S2, and a fitting step S3. Note that before the arrangement step S1, the pouring, curing, and backfilling of the foundation beams 10, and the erection of the steel frame are completed. Furthermore, the arrangement step S1, filling step S2, and fitting step S3 can be repeated a predetermined number of times along the continuous direction of the exterior walls, after which the connection step S4 can be carried out. One feature of the method for installing a spandrel wall of the present invention is that it can be easily performed by placing a precast concrete spandrel wall 20 on a foundation beam 10 and fitting in the fitting member 40, without the need for skilled craftsmen, and allows for the installation of a spandrel wall installation structure with high construction quality.

[0026] <6.1> Placement process (Figure 5A) The placement step S1 is a step of placing the spandrel wall 20 on the foundation beam 10. The placement step S1 is performed, for example, as follows. Dry-mixed mortar for leveling is applied to the top surface of the foundation beam 10, and the waist wall 20 is placed by hanging it on the foundation beam 10. At this time, the side edges 20d of the waist wall 20 are aligned with the positions of the insert bars 11 of the foundation beam 10, and the insert bars 11 are sandwiched between adjacent waist walls 20, thereby defining a storage space 22a that surrounds the insert bars 11 with two opposing recessed grooves 22.

[0027] <6.2> Filling step (Figure 5B) The filling step S2 is a step of filling the spaces between the waist walls 20 with the filler material 30. The filling step S2 is performed, for example, as follows. Filling material 30 is filled into the storage space 22a between adjacent waist walls 20 from above the waist walls 20. The filling material 30 is, for example, dry-mixed mortar. If the waist walls 20 do not have grooves 22, the insert bars 11 are sandwiched between the side edges 20d of the adjacent waist walls 20, and the filling material 30 is applied to the joints from the side of the waist walls 20 to fill them. As the filling material 30 hardens, the foundation beam 10 and the spandrel wall 20 are integrated via the insert bars 11. Note that it is desirable to perform a fitting step S3, which will be described later, before the filling material 30 hardens.

[0028] <6.3> Engagement process (Figure 5C) The fitting step S3 is a step of fitting the fitting member 40 to the waist wall 20. The fitting step S3 is performed, for example, as follows. The opening 40c of the fitting member 40 is placed over the joint of the adjacent waist walls 20 from above, and is pushed in and fitted. In this example, the fitting member 40 has a locking portion 41, so that when the fitting member 40 is pushed into the waist wall 20, the locking portion 41 passes through the protruding portion 21 of the waist wall 20 and locks onto the lower portion of the protruding portion 21. This prevents the waist wall 20 from slipping out. After the fitting member 40 is fitted, a connecting bolt 44 is threaded through the bolt hole 43 on the back surface and into the bolt insert 23 of the waist wall 20 to fix the fitting member 40 to the waist wall 20.

[0029] <6.3.1> Ruler function of fitting parts In the case of conventional PC waist walls, adjacent waist walls are connected only by plates at the top edge, making it difficult to match the height of the waist walls and the alignment of consecutive wall surfaces, and construction errors are likely to occur. In contrast, the method of installing waist walls of the present invention fits fitting members 40 across the joints of the waist walls 20, thereby restricting the wall surfaces 20a and top surfaces 20b of the waist walls 20 with the side plates 40a and top plates 40b of the fitting members, and mechanically aligning the height and alignment of the continuous waist walls 20. This makes it possible for even workers without skilled techniques to install the waist walls 20 with high precision.

[0030] <6.4> Ligation step (Figure 5D) The connecting step S4 is a step of connecting the furring strips 50 to the fitting members 40. The linking step S4 is carried out, for example, as follows. The furring strip 50 is installed along the top of the fitting member 40. At this time, the bolt end 42a of the connecting portion 42 of the fitting member 40 is passed through the connecting hole 51 of the furring strip 50, and a nut is screwed onto the bolt end 42a protruding into the furring strip 50 to connect the bolts. After the connecting step S4, the exterior wall of the steel structure A is completed by attaching exterior wall materials to the furring strips 50 and the furring strips attached to the steel frame. [Explanation of symbols]

[0031] 1. Waist wall installation structure 10 Foundation beam 11 Insertion 20 Waist wall 20a Wall 20b Top surface 20c bottom side 20d side 21 Protrusion 22 Groove 22a Containment Space 23 Bolt insert 30 Filling material 40 fitting member 40a side plate 40b Top plate 40c aperture 41 Locking part 42 Connecting part 42a Bolt end 43 Bolt holes 44 Connecting bolt 50 Fuselage 51 Connection hole A. Steel structure S1 placement process S2 Filling process S3 mating process S4 connection process

Claims

1. A method for installing a spandrel wall of a steel structure, comprising: an arrangement step of placing two spandrel walls on a foundation beam having a plurality of insert bars protruding upward from the top surface at predetermined intervals along the longitudinal direction, with one insert bar sandwiched between the side edges of the two spandrel walls; a filling step of filling a space between the side edges of the two waist walls with filler; a fitting step of fitting a long fitting member having a substantially U-shaped cross section to the upper part of the two waist walls so as to straddle the two waist walls, In the fitting step, the fitting member is used as a ruler to adjust the height of the upper surfaces of the two waist walls and / or the alignment of the wall surfaces. How to install a waist wall.

2. The waist wall has a recessed groove that is continuous in the height direction of the side edge, In the arranging step, the recessed grooves of the two waist walls define a storage space for storing the insert reinforcement, In the filling step, the filler is filled into the storage space. A method for installing a waist wall according to claim 1.

3. The waist wall includes a bolt insert embedded in an upper portion of the wall surface, the fitting member has a bolt hole communicating with the side plate, In the fitting step, the connecting bolt inserted into the bolt hole is screwed into the bolt insert, thereby bolt-fixing the fitting member to the waist wall. A method for installing a waist wall according to claim 1 or 2.

4. A spandrel wall installation structure in a steel structure, a foundation beam having a plurality of reinforcing bars protruding upward at predetermined intervals along the longitudinal direction of the upper surface; Two spandrel walls are placed on the foundation beam with one of the insert bars sandwiched between their side edges; Filling material filled between the side edges of the two waist walls; and a long fitting member having a substantially U-shaped cross section that is fitted to the upper part of the two waist walls across the joints between the two waist walls. Waist wall installation structure.

5. The waist wall has a protruding portion that protrudes outward from the upper edge of the wall surface, the fitting member has a locking portion that protrudes inward from the lower edge of the side plate, The locking portion is locked to a lower portion of the protrusion. The waist wall installation structure according to claim 4.

6. The length of the fitting member is equal to the width of the waist wall. The waist wall installation structure according to claim 4 or 5.

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