Method of connecting beams

Abstract

To provide a method of connecting beams concerning connecting a new beam to an existing beam via a connection hardware, in which the connection hardware can be connected to a predetermined position of the existing beam with high accuracy, and relying on this, the new beam can be connected to the predetermined position of the existing beam with high accuracy.SOLUTION: For extending an existing building, a method for connecting a new beam 60 of an extension to an existing beam 10 of the existing building comprises: an A step for temporary connection by aligning a connection hardware 30 at a predetermined position of the existing beam 10; a B step for connecting the connection hardware 30 to the existing beam 10 after adjusting a posture of the connection hardware 30; and a C step for connecting the new beam 60 to the connection hardware 30. In the A step, the connection hardware 30 is temporarily connected to the existing beam 10 with a temporary connection member 40 via temporary holes 38 in the connection hardware 30.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for connecting beams.

Background Art

[0002] When constructing an extension (or renovation) to an existing building, a part of the outer wall of the existing building is removed to expose, for example, an existing beam (such as a spandrel beam) between floors. A new beam (such as a ceiling beam) of the extension is connected to the exposed existing beam, and further, the foundation of the extension is connected to the foundation of the existing building, and an outer wall panel is attached to the new beam and the foundation. In this method, when members such as a joint box (registered trademark) and a plate for connecting a new beam are not pre-processed, a U-shaped or hat-shaped connecting metal fitting is attached to the existing beam on-site to connect the new beam. For example, when the existing beam is formed of H-shaped steel, the connecting metal fitting is connected to the web of the H-shaped steel. And, in this connecting method, in addition to welding, there is a method of performing drilling on the web and connecting with bolts.

[0003] In such a method for connecting an existing beam and a new beam, in order to horizontally arrange, for example, a floor panel of the second floor on the existing beam and the new beam, it is necessary to connect the new beam with the heights of the existing beam and the new beam aligned. If the heights of the existing beam and the new beam are not aligned, problems such as noise may occur when the floor panel is installed on them.

[0004] On the other hand, in order to connect to the web with the connecting metal fitting placed between the upper and lower flanges of the existing beam, considering the state of the existing beam, the curved fillet at the boundary between the web and the flange, and further the on-site workability, a connecting metal fitting with a height provided with a recess of about 1 mm to several mm from the lower surface of the upper flange and the upper surface of the lower flange can be applied. Then, in order to match the height of the new beam with the height of the existing beam, it is crucial to ensure the connection position of the connecting metal fitting to the existing beam with high accuracy. However, since the connection of the connecting metal fitting to the existing beam depends on the skills of on-site workers, a method for connecting beams that can stably guarantee the connection accuracy of the connecting metal fitting is desired.

[0005] Here, Patent Document 1 proposes a building in which an extension (in this case, an added section) is attached to an existing building (in this case, an existing section). Specifically, it is a building in which a second building is added to the side of an existing first building, structurally independent of it. The second building has a rigid frame structure building unit consisting of columns and beams, and is equipped with a regulating member that restricts the horizontal shaking of the first building relative to the second building by transmitting force from the first building side to the second building side when lateral shaking occurs in the first building. One end of the regulating member is fixed to the unit frame of the second building, and the other end is provided to extend toward the first building. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-237130 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Although the building described in Patent Document 1 is a building in which an extension is attached to an existing building, as mentioned above, there is no disclosure of a beam connection method that can stably guarantee the connection accuracy of the connecting hardware.

[0008] The present invention has been made in view of the above problems, and aims to provide a beam connection method for connecting a new beam to an existing beam via connecting hardware, which enables high-precision connection of connecting hardware to a predetermined position on the existing beam, and thereby enables high-precision connection of the new beam to a predetermined position on the existing beam. [Means for solving the problem]

[0009] To achieve the above objective, one embodiment of the beam connection method according to the present invention is: A method for connecting beams when adding an extension to an existing building, in which new beams of the extension are connected to the existing beams of the existing building, Step A involves aligning and temporarily connecting the connecting hardware to a predetermined position on the existing beam, Step B involves adjusting the orientation of the connecting hardware and then permanently connecting the connecting hardware to the existing beam. The process includes step C, which involves connecting a new beam to the aforementioned connecting hardware. Step A is characterized by temporarily connecting the connecting hardware to the existing beam using a temporary connecting member through a temporary hole in the connecting hardware.

[0010] According to this embodiment, by aligning the connecting hardware to a predetermined position on the existing beam, temporarily connecting the connecting hardware to the existing beam using a temporary connecting member through a temporary hole in the connecting hardware, and then permanently connecting the connecting hardware to the existing beam after adjusting the orientation of the connecting hardware, the height level of the connecting hardware can be precisely aligned at the predetermined position on the existing beam, and the upper surface of the connecting hardware can be made flat before permanent connection to the existing beam. As a result, when a new beam is connected to the connecting hardware, the new beam can be connected to the predetermined position on the existing beam with high precision.

[0011] Here, "adding an extension to an existing building" includes forms such as adding an extension to the exterior side of the existing building or adding floor space to the interior side of the existing building. Furthermore, "aligning the connecting hardware to the designated position on the existing beam" means aligning the connecting hardware to the front position (including the height level) on the existing beam where the connecting hardware should be connected. Additionally, when the new beam is connected to the connecting hardware, it will be flush with the top surface of the existing beam.

[0012] For example, after temporarily connecting the connecting hardware to the existing beam with a single temporary connecting member, the hardware can be rotated around this temporary connecting member to make adjustments (fine adjustments) to achieve a horizontal position before the final connection can be made. Furthermore, various connection methods, including welding and bolting, can be applied to the final connection.

[0013] Furthermore, in another embodiment of the beam connection method according to the present invention, The aforementioned connecting hardware is A U-shaped form comprising two side pieces and a connecting piece that connects the two side pieces and is connected to the new beam, or It is either a hat shape or a hat shape comprising two side pieces, a connecting piece that connects the two side pieces and is connected to the new beam, and leg pieces that protrude laterally from each of the side pieces. The connecting piece is characterized by having at least one of the temporary holes provided therein.

[0014] According to this embodiment, regardless of whether the connecting hardware is U-shaped or hat-shaped, a temporary hole is provided at a predetermined position on the connecting piece that protrudes toward the new beam, allowing the connecting hardware to be temporarily connected to the existing beam via the temporary hole.

[0015] Here, there may be one or more temporary holes, but if there are, for example, two temporary holes, one temporary connecting member can be driven into the existing beam through one temporary hole to temporarily connect the connecting hardware, and after adjusting the position of the connecting hardware, the other temporary connecting member can be driven into the existing beam through the other temporary hole. This allows the connecting hardware to be temporarily connected to the existing beam in a fixed state using two temporary connecting members, and the fixed connecting hardware can then be permanently connected to the existing beam. This is preferable because it improves the workability when permanently connecting the connecting hardware to the existing beam.

[0016] In this case, when a U-shaped connector is used, for example, the ends of the two side pieces can be welded to the web of an existing beam made of H-shaped steel. On the other hand, when a hat-shaped connector is used, bolt holes for permanent connection are made in the left and right legs of the connector, and the existing beam and the connector can be connected with bolts inserted through the bolt holes.

[0017] Furthermore, in another embodiment of the beam connection method according to the present invention, The front view shape of the aforementioned connecting piece is rectangular. The temporary hole is provided on the vertical center line of the rectangle.

[0018] According to this aspect, since a temporary hole is provided above the vertical center line of the rectangle when viewed from the front, when the connecting hardware is rotated around one temporary connecting member, it can be evenly raised and lowered left and right, so that the connecting hardware can be quickly adjusted to a horizontal posture. Here, by providing a plurality (for example, two) of temporary holes above the vertical center line, after adjusting the posture of the connecting hardware with the temporary connecting member inserted into one of the temporary holes as the rotation center, it is preferable that the connecting hardware can be temporarily connected to a fixed posture with another separate temporary connecting member inserted into the other temporary hole.

[0019] Also, in another aspect of the beam connection method according to the present invention, In the step A, among the existing beams, a grid marking is made at a position corresponding to the temporary hole of the connecting hardware to be connected. After aligning the connecting hardware at the predetermined position, the tip of the temporary connecting member inserted through the temporary hole is aligned with the grid marking position, and the temporary connecting member is driven in to temporarily connect the connecting hardware. This is characterized by this.

[0020] According to this aspect, among the existing beams, a grid marking is made at a position corresponding to the temporary hole of the connecting hardware (the position where the temporary hole should be aligned), the connecting hardware is aligned so that the temporary hole coincides with the grid marking, and the temporary connecting member is driven into the grid marking through the temporary hole, whereby the connecting hardware can be temporarily connected to the existing beam with high precision.

[0021] Also, in another aspect of the beam connection method according to the present invention, In the step A, a guide depression is provided at the grid marking position on the existing beam, and the tip of the temporary connecting member inserted through the temporary hole is aligned with the guide depression. This is characterized by this.

[0022] According to this aspect, by providing a guide depression at the grid marking position and aligning the tip of the temporary connecting member inserted through the temporary hole with the guide depression, the tip of the temporary connecting member can be surely aligned with the grid marking position and driven in.

[0023] Also, in another aspect of the beam connection method according to the present invention, When the connecting fitting is in the hat shape, The aforementioned leg piece is provided with a first bolt hole through which a bolt is inserted during the connection process. Step B is characterized by creating a second bolt hole in the existing beam using the first bolt hole, inserting a bolt through the second bolt hole corresponding to the first bolt hole, and bolting the existing beam and the connecting hardware together.

[0024] According to this embodiment, after temporarily connecting a hat-shaped connecting fitting to a predetermined position on the existing beam, a second bolt hole is opened in the existing beam using the first bolt hole, and bolts are inserted through the corresponding first and second bolt holes to bolt-connect the connecting fitting to the existing beam (final connection). This makes it possible to open a second bolt hole with high precision at a position corresponding to the first bolt hole of the connecting fitting on the existing beam, and to achieve smooth insertion of bolts into the first and second bolt holes.

[0025] Furthermore, by temporarily connecting the connecting hardware to existing beams using temporary connecting members such as long screws, and then permanently connecting the connecting hardware using permanent connecting members consisting of bolts, welding is not required for the temporary and permanent connections of the connecting hardware. This makes it possible to carry out construction without fire risk while residents remain in the existing building.

[0026] Furthermore, in another embodiment of the beam connection method according to the present invention, When the connecting fitting is in the hat shape, The aforementioned leg piece is provided with a first bolt hole through which a bolt is inserted during the connection process. In step B, markings are made on the existing beam using the first bolt hole, the temporary connection of the connecting hardware is released, a second bolt hole is made at the mark, the connecting hardware is temporarily reconnected, bolts are inserted through the second bolt hole corresponding to the first bolt hole, and the existing beam and the connecting hardware are bolted together.

[0027] According to this embodiment, even in cases where surrounding members are intricate, such as at the corners of a building, and it is difficult to create a second bolt hole in the existing beam while the connecting hardware is temporarily connected, the existing beam can be marked using the first bolt hole of the temporarily connected connecting hardware. After removing the connecting hardware and creating a second bolt hole at the marking on the existing beam, the connecting hardware can be temporarily reconnected to the existing beam. Bolts can then be inserted through the corresponding first and second bolt holes to bolt the connecting hardware to the existing beam (permanent connection), thereby achieving bolt connection of the connecting hardware to the existing beam. [Effects of the Invention]

[0028] As can be understood from the above explanation, the beam connection method of the present invention, which connects a new beam to an existing beam via a connecting fitting, allows for high-precision connection of the connecting fitting to a predetermined position on the existing beam, and thereby allows for high-precision connection of the new beam to a predetermined position on the existing beam. [Brief explanation of the drawing]

[0029] [Figure 1] This is a process diagram showing an example of a beam connection method according to the embodiment. [Figure 2A] This is a front view of an example of a connecting fitting. [Figure 2B] Figure 2A is a cross-sectional view taken along arrow bb, showing an example of a connecting fitting. [Figure 3] Following Figure 1, the next diagram shows an example of a beam connection method according to the embodiment. [Figure 4] Following Figure 3 is a process diagram showing an example of a beam connection method according to the embodiment. [Figure 5] Following Figure 4, the next diagram shows an example of a beam connection method according to the embodiment. [Figure 6] Following Figure 5 is a process diagram showing an example of a beam connection method according to the embodiment. [Figure 7] Following Figure 6 is a process diagram showing an example of a beam connection method according to the embodiment. [Modes for carrying out the invention]

[0030] Hereinafter, an example of a beam connection method according to the embodiment will be described with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0031] [Beam connection method according to the embodiment] An example of a beam connection method according to the embodiment will be described with reference to Figures 1 to 7. Here, Figures 1, 3 to 7 are process diagrams showing an example of a beam connection method according to the embodiment, in order. Figure 2A is a front view of an example of a connecting fitting, and Figure 2B is a cross-sectional view of the example of a connecting fitting, taken from the direction of arrow bb in Figure 2A.

[0032] The beam connection method shown in the illustration will be explained using an example where a portion of the exterior walls on the first and second floors of an existing two-story light steel frame building are removed, and an extension is constructed on the exterior side of the existing building. Although not shown in the illustration, the beam connection method according to this embodiment can also be applied when adding floor space on the interior side of an existing building.

[0033] Figure 1 shows the state after the first-floor exterior wall panel of the area where the extension will be constructed has been removed, and the existing beam 10 located between floors is exposed to the outside from below the second-floor exterior wall panel 20. The method of connecting the new beam 60 to this existing beam 10 will be described below.

[0034] As shown in Figure 1, the existing exterior wall panels are removed to expose the existing beam 10. The existing beam 10 is made of H-shaped steel and has a web 11 and upper and lower flanges 12 and 13 above and below it, with one wide surface of the web 11 exposed to the outside.

[0035] Figure 1 shows the exterior wall panel 20 of the second floor, which is left in place above the existing beam 10. Here, the illustration of each component is omitted, but the exterior wall panel 20 has a rectangular frame-shaped panel frame and an exterior wall surface material fixed to the panel frame via ventilation battens (the exterior wall surface material is shown in the figure), and the exterior wall panel 20 is installed on the existing beam 10 (girders, etc.) by bolting the panel frame to the existing beam 10 via fixing fittings (not shown) etc.

[0036] For example, using temporary scaffolding (not shown), workers conduct surveys to determine temporary connection positions for temporarily connecting the connecting hardware 30 (see Figure 2, etc.) to the existing beam 10, and mark the web 11 with lines M.

[0037] Here, since a single long screw is used as a temporary connecting member for the temporary connection of the connecting hardware 30, a mark M is made by surveying to indicate the position where the tip of the long screw will be driven in.

[0038] As shown in Figures 2A and 2B, the connecting hardware 30 used when connecting a new beam 60 (see Figure 7) to an existing beam 10 has a hat-like shape, comprising two side pieces 32, a connecting piece 31 that connects the two side pieces 32 and is connected to the new beam 60, and leg pieces 33 that protrude laterally from each side piece 32.

[0039] Each component is made of steel plate and connected to each other by welding. The front view shape of the connecting piece 31 is rectangular, and two temporary holes 38 are provided on the vertical center line L of the rectangle (the vertical line at the center t3 / 2 of the width t3), and a total of six third bolt holes 35 are provided on the left and right sides of the center line L, three on each side. The third bolt holes 35 are bolt holes that are used when bolting the new beam 60.

[0040] As shown in Figure 2B, fixing nuts 39 are welded to the back surface of the connecting piece 31 at positions corresponding to each third bolt hole 35, and the fixing bolts screwed in from the end plate 65 (see Figure 7) side of the new beam 60 are secured by the fixing nuts 39.

[0041] Each leg piece 33 is provided with multiple (two in the illustrated example) first bolt holes 36, which are used when permanently connecting the connecting hardware 30 to the web 11 of the existing beam 10.

[0042] The height of the connecting piece 31 is greater than the height t1 of the leg piece 33, with the upper part being t2 higher. In order to connect the connecting hardware 30 to the web 11 with the existing beam 10 fitted between the upper flange 12 and lower flange 13, the height t1 is set to a height that provides a setback of about 1 mm to several mm from the lower surface of the upper flange 12 and the upper surface of the lower flange 13, taking into consideration the condition of the existing beam 10, the curved fillets at the boundaries between the web 11 and the upper flange 12 and lower flange 13, and on-site constructability.

[0043] As shown in Figure 3, one of the two temporary holes 38 of the connecting hardware 30 (in the illustrated example, the temporary hole 38A is the one that is relatively higher) is aligned with the marking M (see Figure 1) on the web 11 of the existing beam 10, a long screw 40 (an example of a temporary connecting member) is inserted in the X1 direction through the temporary hole 38A, the tip of the long screw 40 is aligned with the marking M, and then the long screw 40 is driven into the web 11 to temporarily connect the connecting hardware 30 to the existing beam 10.

[0044] Here, the height t1 of the leg piece 33 and the side piece 32 of the connecting hardware 30 is set lower than the height t5 between the lower surface of the upper flange 12 and the upper surface of the lower flange 13 of the existing beam 10, so that the connecting hardware 30 can be smoothly fitted between the upper flange 12 and the lower flange 13 of the existing beam 10.

[0045] Alternatively, although not shown in the diagram, a small indentation (guide recess) may be provided in advance at the position of the marking M, and the tip of the long screw 40 inserted into the temporary hole 38A may be aligned with the guide recess before driving in the long screw 40. This method is preferable because it prevents the tip of the long screw 40 from deviating from the marking position when driving it in, and makes it possible to accurately drive the long screw 40 into the marking position.

[0046] Here, the initial measurement of the position for marking the lines M is set so that when the connecting hardware 30 is temporarily connected to the web 11 of the existing beam 10 by a single long screw 40 inserted through the temporary hole 38A of the connecting hardware 30, the positions of each third bolt hole 35 to which the new beam 60 will be bolted are at the design height, and the new beam 60 is at the horizontal position where it should be bolted. The position of the temporary hole 38A in the connecting piece 31 is set in advance, and for example, the temporary hole 38A is drilled at this set value in the manufacturing plant, and information regarding this set value is also transmitted to the site. Based on the set position information of the temporary hole 38A in the connecting piece 31 and the installation position information of the new beam 60 (or connecting hardware 30) in the existing beam 10, the worker performs a survey and marks the lines M at the predetermined position on the web 11.

[0047] Therefore, as shown in Figure 3, when the connecting fitting 30 is temporarily connected to the web 11 with a single long screw 40, the installation height of the connecting fitting 30 is adjusted to the correct height (A steps above).

[0048] Next, as shown in Figure 4, fine adjustments are made to rotate the connecting hardware 30 clockwise or counterclockwise in the X2 direction around the long screw 40, adjusting the orientation so that the connecting hardware 30 is in a horizontal position.

[0049] Because a temporary hole 38A is provided on the center line L of the rectangular connecting piece 31 when viewed from the front, the left and right sides of the connecting fitting 30 can be raised and lowered equally when adjusting the orientation of the connecting fitting 30 by rotating it around the long screw 40, making it possible to quickly adjust the connecting fitting 30 to a horizontal position.

[0050] After adjusting the connecting hardware 30 to a horizontal position, the connecting hardware 30 is temporarily connected to a fixed position by driving long screws 40 into the web 11 through other temporary holes 38B, as shown in Figure 5.

[0051] Next, the drill of the drilling tool T is inserted in the X3 direction through each of the first bolt holes 36 provided in the leg pieces 33 of the connecting hardware 30, and second bolt holes (not shown) are created in the web 11 of the existing beam 10 at positions corresponding to each of the first bolt holes 36.

[0052] In this way, by creating the second bolt hole that actually communicates with the first bolt hole 36 using the aligned first bolt hole 36, there is no risk of problems occurring such as misalignment between the corresponding first bolt hole 36 and second bolt hole, preventing the bolt from being inserted.

[0053] After creating second bolt holes in the web 11 corresponding to each first bolt hole 36, as shown in Figure 6, one-sided bolts 50 (an example of a fixing bolt) are inserted from the outside into the corresponding first bolt holes 36 and second bolt holes to make a bolt connection (final connection). In the illustrated example, the connecting hardware 30 is formally connected to the web 11 by a total of four one-sided bolts 50.

[0054] When permanently connecting the connecting fitting 30, since the connecting fitting 30 is temporarily attached to the web 11 in a fixed position with two long screws 40, there is no risk of the connecting fitting 30 rotating or shifting during the permanent connection. Furthermore, since the bolt connection (permanent connection) can be quickly performed after creating the second bolt hole using the first bolt hole 36 as a guide, the workability is greatly improved.

[0055] Thus, since the connecting piece 31 has at least two temporary holes 38, the connecting hardware 30 can be temporarily connected to the web 11 with two long screws 40 in a fixed position. Therefore, it is also possible to have three or more temporary holes 38 and to use three or more long screws 40 for the temporary connection.

[0056] After permanently connecting the connecting hardware 30 to the web 11, remove any long screws 40 that may obstruct the connection between the connecting hardware 30 and the new beam 60. If the long screws 40 do not pose an obstacle, they may be left in place (end of step B).

[0057] Next, as shown in Figure 7, a new beam 60, formed from H-shaped steel and suspended by a crane (not shown), is brought close to the connecting hardware 30. An end plate 65 is welded to the end of the new beam 60, and a fourth bolt hole 66 is provided in the end plate 65 at a position corresponding to each of the third bolt holes 35.

[0058] The new beam 60 is brought close to the connecting hardware 30 in the X4 direction, the connecting piece 31 and the end plate 65 are brought into contact, and then bolts (not shown, for example, one-sided bolts) are inserted through the corresponding third bolt hole 35 and fourth bolt hole 66 to connect the existing beam 10 and the new beam 60 via the connecting hardware 30.

[0059] Through the above series of construction methods, the existing beam 10 and the new beam 60 are connected to each other via the connecting hardware 30, making the upper surface of the upper flange 12 of the existing beam 10 and the upper surface of the upper flange 62 of the new beam 60 flush. As a result, even if floor panels of the extension are installed on top of them, there is no risk of noise or other problems occurring. Furthermore, even if roof panels of the extension are installed on top of them, there is no risk of unevenness causing the roof panels to sag or other problems occurring (End of C process).

[0060] According to the beam connection method shown in the diagram, the connecting hardware 30 can be connected to a predetermined position on the existing beam 10 with high precision, and based on this, the new beam 60 can be connected to the predetermined position on the existing beam 10 via the connecting hardware 30 with high precision.

[0061] Furthermore, since bolt connections are applied to both the temporary and permanent connections of the connecting hardware 30, and to the connection of the new beam 60 to the connecting hardware 30, and welding is not applied, construction can be carried out without fire risk while residents remain in the existing building.

[0062] Here, although not shown in the diagram, if, for example, the surrounding members are intricate, such as at the corners of a building, and it is difficult to drill a second bolt hole in the existing beam 10 while the connecting hardware 30 is temporarily connected to the web 11, a method may be applied in which the web 11 is marked using the first bolt hole 36 of the connecting hardware 30, the temporary connection of the connecting hardware 30 is released, a second bolt hole is drilled at the mark, the connecting hardware 30 is temporarily reconnected, and bolts are inserted through the corresponding first bolt hole 36 and second bolt hole to permanently connect the existing beam and the connecting hardware.

[0063] Although not shown in the illustration, in addition to the hat-shaped form shown in the illustration, a U-shaped form may also be applied to the connecting hardware, which comprises two side pieces and a connecting piece that connects the two side pieces and is connected to the new beam. When a U-shaped connecting hardware is applied, the ends of the side pieces are permanently connected to the web of the existing beam by welding.

[0064] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of symbols]

[0065] 10: Existing beam (H-beam) 11: Web 12: Upper flange 13: Lower flange 20: Exterior wall panels 30: Connecting hardware 31: Connecting piece 32: Side piece 33: Leg piece 35: Third bolt hole 36: First bolt hole 38,38A,38B:Temporary hole 39: Fixing nut 40: Temporary connecting member (long screw) 50: Fixing bolt (one-sided bolt) 60: New beam 62: Upper flange 65: End plate 66: Fourth bolt hole M: Ruled lines L: Center line (vertical center line) T: Hole drilling tool

Claims

1. A method for connecting beams when adding an extension to an existing building, in which new beams of the extension are connected to the existing beams of the existing building, Step A involves aligning and temporarily connecting the connecting hardware to a predetermined position on the existing beam, Step B involves adjusting the orientation of the connecting hardware and then permanently connecting the connecting hardware to the existing beam. The process includes step C, which involves connecting a new beam to the aforementioned connecting hardware. A beam connection method characterized in that, in step A, the connecting fitting is temporarily connected to the existing beam by a single temporary connecting member through a temporary hole in the connecting fitting so that it can rotate around the temporary connecting member.

2. The aforementioned connecting hardware is A U-shaped form comprising two side pieces and a connecting piece that connects the two side pieces and is connected to the new beam, or It is either a hat shape comprising two side pieces, a connecting piece that connects the two side pieces and is connected to the new beam, and leg pieces that protrude laterally from each of the side pieces. The beam connection method according to claim 1, characterized in that at least one of the temporary holes is provided in the connecting piece.

3. The front view shape of the aforementioned connecting piece is rectangular. The beam connection method according to claim 2, characterized in that the temporary hole is provided on the vertical center line of the rectangle.

4. The beam connection method according to claim 3, characterized in that in step A, markings are made on the existing beam at positions corresponding to the temporary holes of the connecting hardware to be connected, the connecting hardware is positioned at the predetermined positions, the tip of the temporary connecting member inserted through the temporary holes is positioned at the marked positions, and the temporary connecting member is driven in to temporarily connect the connecting hardware.

5. The beam connection method according to claim 4, characterized in that, in step A, a guide recess is provided at the marking position on the existing beam, and the tip of the temporary connecting member through the temporary hole is aligned with the guide recess.

6. When the connecting fitting is in the hat shape, The aforementioned leg piece is provided with a first bolt hole through which a bolt is inserted during the connection process. The beam connection method according to claim 4 or 5, characterized in that, in step B, a second bolt hole is made in the existing beam using the first bolt hole, a bolt is inserted through the second bolt hole corresponding to the first bolt hole, and the existing beam and the connecting hardware are bolted together.

7. When the connecting fitting is in the hat shape, The aforementioned leg piece is provided with a first bolt hole through which a bolt is inserted during the connection process. The beam connection method according to claim 4 or 5, characterized in that in step B, marking is performed on the existing beam using the first bolt hole, the temporary connection of the connecting hardware is released, a second bolt hole is opened at the marking, the connecting hardware is temporarily reconnected, a bolt is inserted through the second bolt hole corresponding to the first bolt hole, and the existing beam and the connecting hardware are bolted together.

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