Method for adjusting the height of floor beams

Abstract

To provide a floor beam height adjusting method allowing adjustment of a floor beam height.SOLUTION: A floor beam height adjusting method comprises: a step A for temporarily forming a connection structure 80 in which a floor beam receiving material 30 has an abutting piece 31 abutting on a side face 12 of foundation 10 and an engagement piece 32 engaged to an upper surface 11 of the foundation 10, a height adjusting bolt 43 for raising and lowering the floor beam receiving material 30 by forming a reaction force to the upper surface 11 is fitted to the engagement piece 32, the abutting piece 31 and the side face 12 are fixed by a first bolt 41, and a support piece 33 and a floor beam 50 are fixed by a second bolt 42; and a step B for forming a connection structure 90 in which the first bolt 41 is loosened, the height adjustment bolt 43 is tightened to provide a first clearance C1 between the upper surface 11 and the engagement piece 32 and a height adjusting plate 70 is inserted, the height adjustment bolt 43 is loosened to make the engagement piece 32 abut on the height adjustment plate 70 to thereby adjust the height of the floor beam 50, and to tighten the first bolt 41.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a method for adjusting the height of a floor beam.

Background Art

[0002] In a structure where a floor beam is connected to a foundation such as a fabric foundation through a mounting jig (floor beam receiving member) and a floor material (floor surface material, floor panel material, etc.) is supported by a plurality of floor beams, various types of floor beam receiving members are applied to connect the floor beam and the foundation.

[0003] For example, Patent Document 1 proposes a floor beam support structure that can secure an underfloor space for work. In this floor beam support structure, the floor beam includes a web, an upper flange joined to the upper edge of the web, a lower flange joined to the lower edge of the web, an end plate portion covering the end face of the beam end, and a stiffener provided between the upper flange and the lower flange. The beam end of the web is formed with the lower end portion being cut out, and the length (beam length) from the upper flange to the lower flange of the floor beam is such that the beam ends located on both sides in the longitudinal direction are lower than the beam center portion.

[0004] The floor beam support structure further includes a bracket that receives a part of the beam end and is attached to the building frame, and a joining member that joins the bracket and the beam end. The joining member includes a nut pre-joined to a joining piece portion of the lower flange and a bolt screwed into the nut. A bolt insertion hole is formed at a position corresponding to the nut in the joining piece portion. The bracket includes an attachment piece portion, a flat plate portion that abuts against the side surface of the building frame, and a locking piece portion that is joined to the upper edge of the flat plate portion and locked to the upper surface of the building frame. The attachment piece portion of the bracket is attached to the building frame, and then, the beam end of the floor beam is supported by the main body portion of the bracket, thereby forming the floor beam support structure.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] According to the floor beam support structure described in Patent Document 1, a floor beam in which the beam depth at the beam ends located on both sides in the longitudinal direction is lower than that at the center of the beam can be connected to the building structure by a bracket and connecting member attached to the building structure, thereby securing underfloor space for work.

[0007] Incidentally, the top surface of the foundation is generally constructed at the design level or slightly lower than the design level, in order to comply with various height restrictions of the building. For this reason, when attaching floor beams to the foundation, it is common practice to adjust the height of the floor beams to the design level. However, the brackets and connecting members described in Patent Document 1 do not disclose any means for adjusting the height of the floor beams.

[0008] This invention has been made in view of the above problems, and aims to provide a method for adjusting the height of a floor beam, which enables height adjustment of the floor beam when connecting the floor beam to the foundation via a floor beam support member. [Means for solving the problem]

[0009] To achieve the above objective, one aspect of the floor beam height adjustment method according to the present invention is: In a floor beam and foundation connection structure in which a floor beam support member is connected to the foundation and the floor beam support member supports a steel-framed floor beam, a method for adjusting the height of the floor beam is provided. The aforementioned floor beam support member is A contact piece that abuts against the side surface of the aforementioned foundation, A locking piece extending from the back surface of the contact piece toward the foundation and engaging with the top surface of the foundation, The abutment piece has a support piece that extends from the front surface of the abutment piece toward the opposite side of the foundation and supports the floor beam, Step A involves temporarily forming the connection structure, in which a height adjustment bolt is attached to the locking piece to raise and lower the floor beam support member by taking a reaction force from the top of the foundation, the abutment piece and the side surface of the foundation are fixed by a first bolt, and the support piece and the floor beam are fixed by a second bolt, The invention is characterized by having step B, which involves loosening the first bolt, tightening the height adjustment bolt to create a first clearance between the top of the foundation and the locking piece, inserting the height adjustment plate into the first clearance, loosening the height adjustment bolt to bring the locking piece into contact with the height adjustment plate, thereby adjusting the height of the floor beam, and tightening the first bolt to form the connection structure.

[0010] According to this embodiment, the floor beam support member is equipped with a height adjustment bolt that takes reaction force from the top of the foundation to raise and lower itself. In step A, a connection structure is temporarily formed in which the abutment piece forming the floor beam support member and the side surface of the foundation are fixed by a first bolt, and the support piece forming the floor beam support member and the floor beam are fixed by a second bolt. Then, in step B, the first bolt is loosened, the height adjustment bolt is tightened to create a first clearance between the top of the foundation and the locking piece, and the height adjustment plate is inserted. The height adjustment bolt is then loosened to bring the locking piece into contact with the height adjustment plate, thereby forming the connection structure after adjusting the height of the floor beam.

[0011] Furthermore, by applying the floor beam support material with the above configuration to the method of adjusting the height of the floor beams, it is possible to eliminate the concentration of bolts (anchor bolts) that fix the floor beams and columns to the top surface of the foundation. Conventional floor beam support materials tend to concentrate anchor bolts on the top surface of the foundation or base, and if anchor bolts that fix steel columns are also included, there is a problem in that anchor bolts are even more concentrated on the top surface.

[0012] Here, the term "foundation" includes various types of foundations, such as reinforced concrete strip foundations and steel frame foundations (sill plates). Furthermore, floor beams include steel beams made of H-shaped steel or square steel pipes, as well as precast reinforced concrete beams.

[0013] Furthermore, other embodiments of the floor beam height adjustment method according to the present invention include: In step A, if there is a second clearance between the contact piece and the end of the floor beam, step B is characterized in that a wedge is inserted into the second clearance before tightening the height adjustment bolt.

[0014] According to this embodiment, when there is a second clearance between the contact piece and the end of the floor beam, inserting a wedge into the second clearance before tightening the height adjustment bolt eliminates the rattle between the contact piece and the floor beam, thereby enabling the entire floor beam support member and floor beam to be raised smoothly.

[0015] Floor beams are typically manufactured to be slightly shorter than the distance between opposing foundations, as they are fitted within the foundations. As a result, a small clearance (second clearance) is created between the contact piece of the floor beam support, which is positioned to abut against the side of the foundation, and the end of the floor beam. If an adjustment is made to raise the overall height of the floor beam support and floor beam while this second clearance is present, the floor beam support will tilt towards the floor beam by the amount of the second clearance, making it impossible to smoothly raise the entire floor beam support and floor beam. Similarly, if the entire floor beam support and floor beam is to be lowered after adjusting the height of the floor beam and inserting an adjustment plate into the first clearance, the second clearance will cause the entire floor beam support and floor beam to be in an oblique position, causing the height adjustment bolt to jam in the bolt hole and making it difficult to lower. Therefore, by inserting a wedge into the second clearance to eliminate the rattle between the contact piece and the floor beam, and integrating the floor beam support material with the floor beam, these problems can be solved simply and effectively.

[0016] Furthermore, in another embodiment of the floor beam height adjustment method according to the present invention, The contact piece has a first bolt hole, which is an elongated hole extending in the vertical direction. In step B, when the locking piece is raised to provide the first clearance, the first bolt hole moves upward relative to the loosened first bolt.

[0017] According to this aspect, the first bolt hole formed in the abutting piece is an elongated hole, and the elongated hole forms a means for adjusting the vertical position of the abutting piece with respect to the foundation, so that the overall vertical direction (for example, the vertical direction) of the floor beam receiving member including the abutting piece can be adjusted in height at the site.

[0018] For example, insert nuts are embedded in the side surface of the foundation, the abutting piece of the floor beam receiving member abuts against the side surface, the first bolt hole and the insert nut are aligned, and bolt connection is performed with the first bolt. When the floor beam receiving member rises with respect to the side surface of the foundation, the elongated hole slides upward with respect to the first bolt locked to the insert nut in a loose state, and after the height adjustment of the floor beam receiving member is finally performed, the first bolt is tightened against the insert nut through the first bolt hole, so that the position of the floor beam receiving member with respect to the foundation is set. Therefore, the first bolt hole, which is an elongated hole, serves as a means for adjusting the position of the floor beam receiving member.

[0019] Also, in another aspect of the method for adjusting the height of the floor beam according to the present invention, In the step B, the height adjustment plate having a thickness corresponding to the height to be adjusted is selected and used from a plurality of types of height adjustment plates having different thicknesses.

[0020] According to this aspect, since a plurality of types of height adjustment plates having different thicknesses are prepared, after adjusting the floor beam receiving member and the floor beam to various adjustment heights, the floor beam receiving member supporting the floor beam can be stably connected to the foundation.

Effect of the Invention

[0021] As can be understood from the above description, according to the method for adjusting the height of the floor beam of the present invention, when connecting the floor beam to the foundation via the floor beam receiving member, the height adjustment of the floor beam can be realized.

Brief Description of the Drawings

[0022] [Figure 1]This figure shows an exploded perspective view of an example of a floor beam support member, which is applied to the floor beam height adjustment method according to the embodiment, along with the foundation to which the floor beam support member is attached. [Figure 2] This is a perspective view showing an example of a floor beam support member attached to the foundation. [Figure 3] This figure illustrates step A of an example of a method for adjusting the height of a floor beam according to the embodiment. [Figure 4] This is a perspective view of an example of a connection structure between a floor beam and a foundation, which was provisionally formed in process A. [Figure 5] This figure illustrates step B of an example of a floor beam height adjustment method according to the embodiment. [Figure 6] Following Figure 5, this figure illustrates step B, an example of a method for adjusting the height of floor beams. [Figure 7] Following Figure 6, this figure illustrates step B, an example of a method for adjusting the height of floor beams. [Figure 8] Following Figure 7, this figure illustrates step B, an example of a method for adjusting the height of floor beams. [Modes for carrying out the invention]

[0023] Hereinafter, an example of a floor beam height adjustment method according to the embodiment will be described with reference to the attached drawings, along with a floor beam support member applied to the height adjustment method and an example of a connection structure between the floor beam and the foundation formed by the height adjustment method. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0024] [Method for adjusting the height of a floor beam according to this embodiment] An example of a floor beam height adjustment method according to the embodiment will be described with reference to Figures 1 to 8. Here, Figure 1 is an exploded perspective view of an example of a floor beam support member applied to the floor beam height adjustment method according to the embodiment, showing the floor beam support member together with the foundation to which it is attached, and Figure 2 is a perspective view showing the example of a floor beam support member attached to the foundation. Furthermore, Figures 3 to 8 are, in order, process diagrams of an example of a floor beam height adjustment method according to the embodiment. In detail, Figure 3 is a diagram explaining step A of an example of a floor beam height adjustment method according to the embodiment, and Figure 4 is a perspective view of an example of a connection structure between a floor beam and a foundation that has been provisionally formed in step A. Furthermore, Figures 5 to 8 are, in order, diagrams explaining step B of an example of a floor beam height adjustment method according to the embodiment.

[0025] Figure 1 shows a section of a strip foundation 10 (an example of a foundation) having a predetermined length in a certain direction, with the main reinforcement bars and stirrups embedded in the concrete omitted from the illustration. For example, a strip foundation 10 is provided in the shape of a rectangular frame in plan view, and multiple floor beams 50 are erected on a pair of strip foundations 10 extending in the longitudinal direction of the rectangle, thereby forming a floor beam support frame that supports the floor of the first floor. However, the illustration of the overall structure is omitted, and here we will describe the connection structure of the strip foundation 10 and the floor beams 50 connected via floor beam support members 30. In the following explanation, including Figure 1, the direction along the longitudinal direction of the steel column 20 is referred to as the vertical direction, and the longitudinal direction of the strip foundation 10 is referred to as the horizontal direction. The vertical direction is, for example, the vertical direction, and the horizontal direction is, for example, the horizontal direction.

[0026] The strip foundation 10 has a rectangular parallelepiped shape that is long in the longitudinal direction, and the steel column 20 is fixed to its top surface 11 via mounting brackets 21. The steel column 20 is formed from shaped steel materials such as square steel pipes or H-shaped steel, but the steel column 20 in the illustrated example is formed from square steel pipes.

[0027] The mounting bracket 21 is formed by welding multiple steel plates together in a block shape, with anchor bolts 25 positioned on either side of a vertical steel plate that separates the center (one of the anchor bolts 25 is shown in Figure 1), and the anchor bolts 25 are fixed inside the strip foundation 10 through bolt holes (not shown) in the lower steel plate.

[0028] The lower end of the steel column 20 and the steel plate above the mounting bracket 21 are joined by welding. In this example, instead of the mounting bracket 21 shown, a steel plate (base plate) may be welded to the lower end of the steel column 20, and anchor bolts may be inserted through bolt holes provided in the base plate.

[0029] The floor beam support member 30 has a contact piece 31 that abuts against the side surface 12 of the foundation 10, a locking piece 32 that extends from the back surface (the surface on the foundation 10 side) of the contact piece 31 toward the foundation 10 and locks onto the top surface 11 of the foundation 10, and a support piece 33 that extends from the front surface (the surface on the floor beam 50 side) of the contact piece 31 toward the opposite side of the foundation 10 and supports the floor beam 50, and the overall side view shape is approximately Z-shaped.

[0030] In the illustrated example, two locking pieces 32 are positioned above the back surface of the contact piece 31, at a location that sandwiches the steel column 20 when the contact piece 31 comes into contact with the side surface 12 of the foundation 10. Here, there may be one locking piece 32 or three or more.

[0031] Furthermore, the support piece 33 is attached to the lower central position on the front surface of the contact piece 31 and has a length that is necessary and sufficient to support the floor beam 50.

[0032] Two first bolt holes 34 are provided on the left and right sides of the contact piece 31, and the first bolt holes 34 are elongated holes that extend in the vertical direction.

[0033] Two insert nuts 15 are embedded in the side surface 12 of the foundation 10, with their openings facing the side surface 12, and two first bolt holes 34 are provided in the contact piece 31 at positions corresponding to the openings of each insert nut 15.

[0034] When the abutment piece 31 is brought close to the side surface 12 of the foundation 10 in the X3 direction so that the abutment piece 31 abuts against it, and at the same time the two locking pieces 32 are locked to the top surface 11 of the foundation, the openings of each insert nut 15 and the first bolt holes 34 are aligned, and the first bolt 41 is inserted from the front of the abutment piece 31 in the X4 direction and screwed into the insert nut 15, thereby fixing the floor beam support member 30, including the abutment piece 31, to the side surface 12 of the foundation 10.

[0035] In this way, since the floor beam support member 30 is bolted to the side surface 12 of the foundation 10 rather than the top surface 11, the concentration (intertwining) of multiple anchor bolts and bolts on the top surface 11 of the foundation 10 is eliminated.

[0036] The support piece 33 has two second bolt holes 35 which are aligned with third bolt holes 52 (see Figure 3) which are located in the lower flange 51 of the floor beam 50 formed from H-shaped steel, as shown in Figure 4, and the support piece 33 and the floor beam 50 are fixed together via second bolts 42.

[0037] The second bolt 42 is inserted through the third bolt hole 52 of the lower flange 51 of the floor beam 50, then as shown in Figure 1, it is inserted through the fourth bolt hole 38 of the intervening piece 37 in the X2 direction, and then through the second bolt hole 35 of the support piece 33 in the X1 direction.

[0038] Here, the second bolt hole 35 and the third bolt hole 52 have hole diameters that allow the second bolt 42 to be screwed in. For example, if there are manufacturing or construction tolerances between the second bolt hole 35 and the third bolt hole 52, the second bolt 42 cannot be inserted through the second bolt hole 35 and the third bolt hole 52.

[0039] Therefore, an intervening piece 37, which has a fourth bolt hole 38 that is larger in diameter than the second bolt hole 35 and the third bolt hole 52, is pre-fixed to the upper surface of the support piece 33, for example by welding. More specifically, the support piece 33 and the intervening piece 37 are fixed to the two second bolt holes 35 with the two corresponding fourth bolt holes 38 aligned at their centers.

[0040] The relatively large diameter fourth bolt hole 38 is interposed between the second bolt hole 35 and the third bolt hole 52. By inserting the second bolt 42 diagonally and guiding the tip of the second bolt 42 into the third bolt hole 52, and then tightening the second bolt 42, the floor beam 50 is slid in its longitudinal direction, and as shown in Figure 3, the floor beam 50 and the support piece 33 are connected by the second bolt 42 via the intervening piece 37. Therefore, the intervening piece 37 with the fourth bolt hole 38 acts as a bolt guide when there is a tolerance between the second bolt 42 and the third bolt hole 52, guiding the insertion of the second bolt 42 and enabling bolt connection between the two.

[0041] Returning to Figure 2, a fifth bolt hole 36 is provided in the locking piece 32, and a height adjustment bolt 43 for adjusting the height of the floor beam support member 30, including the locking piece 32, to the foundation 10 is screwed into the fifth bolt hole 36.

[0042] As shown in Figure 2, the floor beam support member 30 is temporarily fixed to the foundation 10 by loosely tightening the first bolt 41 so that it can move up and down (vertically). Then, by tightening or loosening the height adjustment bolt 43, the tip of the height adjustment bolt 43 takes reaction force from the top surface 11 of the foundation 10, and the entire floor beam support member 30, including the locking piece 32, can be raised and lowered in the Y1 direction.

[0043] During this height adjustment, the first bolt hole 34 provided in the contact piece 31 is an elongated hole extending in the vertical direction, making it possible to raise and lower the contact piece 31 within the range of the elongated hole. Therefore, the first bolt hole 34 serves as a means for adjusting the vertical position of the floor beam support member 30.

[0044] Since the height adjustment of the floor beam support member 30 is actually intended to adjust the height of the floor beam 50, in practice, with the floor beam 50 bolted to the support piece 33, the top surface of the floor beam 50 is adjusted to a predetermined design level by raising and lowering the floor beam support member 30 and the floor beam 50 using the height adjustment bolt 43.

[0045] As shown in Figure 2, the connection structure 90 shown in Figure 8, which is formed when the floor beam 50 is fixed to the floor beam support member 30 fixed to the side surface 12 of the foundation 10, is formed after the height and horizontal adjustment (lateral adjustment) of the floor beam 50 relative to the foundation 10 can be easily performed on site. Furthermore, as already explained, the concentration of numerous anchor bolts and bolts, including the anchor bolts 25 that fix the steel column 20, on the top surface 11 of the foundation 10 is also eliminated.

[0046] The top surface of the foundation 10 is constructed slightly lower than the design level to comply with various height restrictions for the building. Therefore, when attaching the floor beam 50 to the foundation 10, the height of the floor beam 50 is adjusted to the design level.

[0047] Therefore, in the method for adjusting the height of the floor beam, first, as shown in Figure 4, a temporary connection structure 80 between the floor beam and the foundation is formed, in a state where the top surface of the floor beam 50 is not set to the design level (this is step A, where the connection structure is temporarily formed).

[0048] As shown in Figure 5, in the temporary connection structure 80, there is a second clearance C2 between the abutment piece 31 and the end 53 of the floor beam 50. The floor beam 50 is generally made slightly shorter than the length between the two foundations, as it is housed between the foundation 10 shown and another opposing foundation not shown. Therefore, a small second clearance C2 generally occurs between the abutment piece 31 of the floor beam support member 30 and the end 53 of the floor beam 50, as shown in the illustrated example.

[0049] If an attempt is made to raise the overall height of the floor beam support member 30 and the floor beam 50 while this second clearance C2 is still present, the floor beam support member 30 will tilt towards the floor beam 50 by the amount of the second clearance C2, making it impossible to smoothly raise the entire floor beam support member 30 and floor beam 50.

[0050] Therefore, as shown in Figure 5, the wedge 60 is inserted (driven) into the second clearance C2 to eliminate the rattle between the contact piece 31 and the floor beam 50, thereby integrating the two. However, if there is no second clearance C2 between the contact piece 31 and the end 53 of the floor beam 50, then inserting the wedge 60 is unnecessary.

[0051] Next, as shown in Figure 6, after loosening the first bolt 41 in the Y2 direction, the height adjustment bolt 43 is tightened in the Y3 direction, thereby creating a reaction force at the top surface 11 of the foundation 10 and moving (raising) the floor beam support member 30 that supports the floor beam 50 upward in the Y4 direction.

[0052] As the floor beam support member 30 moves upward, a first clearance C1 is formed between the locking piece 32 and the top surface 11 of the foundation 10.

[0053] Next, as shown in Figure 7, a height adjustment plate 70 having a thickness that allows the floor beam 50 to be installed at a predetermined design level is inserted into the first clearance C1. The height adjustment plate 70 has a rectangular shape in plan view with a recess inside the rectangle, or a U-shaped or U-shaped shape in plan view with a recess. Here, various thicknesses of height adjustment plates 70 are available on site, and a height adjustment plate 70 with a thickness corresponding to the thickness of the formed first clearance C1 is selected and inserted into the first clearance C1, and a height adjustment bolt 43 is loosely fitted into the recess of the height adjustment plate 70.

[0054] Next, as shown in Figure 8, the height adjustment bolt 43 is loosened in the Y5 direction to lower the entire floor beam support member 30 and floor beam 50 in the Y6 direction, and the locking piece 32 is brought into contact with the height adjustment plate 70. With the height of the floor beam 50 adjusted to the design level, the floor beam 50 is installed on the foundation 10 via the floor beam support member 30.

[0055] Subsequently, the first bolt 41 is tightened in the Y7 direction to form a connection structure 90 between the floor beam 50 and the foundation 10 via the floor beam support member 30 (this completes step B).

[0056] According to the floor beam height adjustment method shown in the diagram, it becomes possible to easily and smoothly adjust the height of the floor beam 50 and connect it to the foundation 10 via the floor beam support member 30.

[0057] 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]

[0058] 10: Foundation (strip foundation) 11: Top surface (top surface) 12: Side view 15: Insert Nut 20: Steel column 21: Mounting hardware 25: Anchor bolts 30: Floor beam support material 31: Contact piece 32: Locking piece 33: Support piece 34: First bolt hole (elongated hole) 35: Second bolt hole 36: Fifth bolt hole 37: Intervening piece 38: Fourth bolt hole (large diameter hole) 41: First bolt 42: Second bolt 43: Height adjustment bolt 44: Nut 50: Floor beam 51: Lower flange 52: Third bolt hole 53: End 60: Wedge 70: Height adjustment plate 80: Temporary connection structure between floor beams and foundation (temporary connection structure) 90: Connection structure between floor beams and foundation (connection structure) C1: First clearance (clearance) C2: Second clearance (clearance)

Claims

1. In a floor beam and foundation connection structure in which a floor beam support member is connected to the foundation and the floor beam support member supports a steel-framed floor beam, a method for adjusting the height of the floor beam is provided. The aforementioned floor beam support member is A contact piece that abuts against the side surface of the aforementioned foundation, A locking piece extending from the back surface of the contact piece toward the foundation and engaging with the top surface of the foundation, The abutment piece has a support piece that extends from the front surface of the abutment piece toward the opposite side of the foundation and supports the floor beam, Step A involves temporarily forming the connection structure, in which a height adjustment bolt is attached to the locking piece to raise and lower the floor beam support member by taking a reaction force from the top of the foundation, the abutment piece and the side surface of the foundation are fixed by a first bolt, and the support piece and the floor beam are fixed by a second bolt, A method for adjusting the height of a floor beam, characterized by having step B: loosening the first bolt, tightening the height adjustment bolt to create a first clearance between the top of the foundation and the locking piece, inserting the height adjustment plate into the first clearance, loosening the height adjustment bolt to bring the locking piece into contact with the height adjustment plate to adjust the height of the floor beam, and tightening the first bolt to form the connection structure.

2. The method for adjusting the height of a floor beam according to claim 1, characterized in that, in step A, if there is a second clearance between the contact piece and the end of the floor beam, in step B, a wedge is inserted into the second clearance before tightening the height adjustment bolt.

3. The contact piece has a first bolt hole, which is an elongated hole extending in the vertical direction. The method for adjusting the height of a floor beam according to claim 1 or 2, characterized in that, in step B, when the locking piece is raised to provide the first clearance, the first bolt hole moves upward relative to the loosened first bolt.

4. The method for adjusting the height of a floor beam according to claim 1 or 2, characterized in that, in step B, a height adjustment plate having a thickness corresponding to the height to be adjusted is selected and used from among a plurality of height adjustment plates of different thicknesses.

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