JP7845671B2 - Method for adjusting the height of floor beams - Google Patents

Description

This invention relates to a method for adjusting the height of floor beams.

In structures where floor beams are connected to foundations such as strip foundations via mounting jigs (floor beam support members), and flooring materials (floor surface materials, floor panel materials, etc.) are supported by multiple floor beams, various types of floor beam support members are used to connect the floor beams to the foundation.

For example, Patent Document 1 proposes a floor beam support structure that can secure underfloor space for work. In this floor beam support structure, the floor beam comprises 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 covering the end face of the beam end, and a stiffener provided between the upper and lower flanges. The beam end of the web is formed by cutting out the lower end, and the length from the upper flange to the lower flange of the floor beam (beam depth) is such that the beam ends on both sides in the longitudinal direction are lower than the beam center.

The floor beam support structure further comprises a bracket that receives a portion of the beam end and is attached to the building frame, and a connecting member that joins the bracket and the beam end. The connecting member includes a nut pre-attached to the connecting piece of the lower flange and a bolt that is screwed into the nut. A bolt insertion hole is formed at the position corresponding to the nut on the connecting piece. The bracket includes a mounting piece, a flat plate portion that abuts against the side of the building frame, and a locking piece that is attached to the upper edge of the flat plate portion and engages with the upper surface of the building frame. The mounting piece of the bracket is attached to the building frame, and then the beam end of the floor beam is supported by the main body of the bracket, thereby forming the floor beam support structure.

Japanese Patent Publication No. 2015-209705

According to the floor beam support structure described in Patent Document 1, a floor beam whose beam depth at the beam ends 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 brackets and connecting members attached to the building frame, thereby securing underfloor space for work.

Incidentally, the top surface of the foundation is generally constructed at or slightly below the design level, in order to comply with various height restrictions for the building. Therefore, 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.

This invention was made in view of the above-mentioned problems, and aims to provide a method for adjusting the height of floor beams, which allows for height adjustment of floor beams when connecting them to the foundation via floor beam support members.

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 to adjust the height of the floor beam, and tightening the first bolt to form the connection structure.

According to this embodiment, the floor beam support member is equipped with a height adjustment bolt that raises and lowers itself by taking a reaction force from the top surface of the foundation. In step A, a connection structure is temporarily formed in which the contact 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 surface of the foundation and the locking piece, and the height adjustment plate is inserted. By loosening the height adjustment bolt and bringing the locking piece into contact with the height adjustment plate, the connection structure can be formed after adjusting the height of the floor beam.

Furthermore, by applying the floor beam support material with the above configuration to the floor beam height adjustment method, the concentration of bolts (anchor bolts) that fix the floor beams and columns to the top surface of the foundation can be eliminated. Conventional floor beam support materials tend to concentrate anchor bolts at the top surface of the foundation or base, and including the anchor bolts that fix the steel columns, there is a problem of even greater concentration of anchor bolts at the top surface.

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 and square steel pipes, as well as precast reinforced concrete beams.

Furthermore, another embodiment of the floor beam height adjustment method according to the present invention is:
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.

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.

Floor beams are generally manufactured to be slightly shorter than the distance between opposing foundations, as they are fitted within the foundations of the opposing 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. Furthermore, 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 entire floor beam support and floor beam will be in an oblique position due to the second clearance, 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 by integrating the floor beam support material with the floor beam, these problems can be resolved simply and effectively.

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.

According to this embodiment, the first bolt hole provided in the contact piece is an elongated hole, and this elongated hole forms a means for adjusting the vertical position of the contact piece relative to the foundation. This allows for on-site vertical height adjustment (e.g., in the vertical direction) of the entire floor beam support member, including the contact piece.

For example, an insert nut is embedded in the side of the foundation, the contact piece of the floor beam support is brought into contact with the side, the first bolt hole and the insert nut are aligned, and the two are bolted together with the first bolt. When the floor beam support rises relative to the side of the foundation, the elongated hole slides upward relative to the first bolt, which is loosely locked in the insert nut. After the height of the floor beam support is finally adjusted, the first bolt is tightened into the insert nut via the first bolt hole, thereby setting the position of the floor beam support relative to the foundation. Thus, the elongated first bolt hole serves as a means for adjusting the position of the floor beam support.

Furthermore, in another embodiment of the floor beam height adjustment method according to the present invention,
In step B, the method is characterized by selecting and using a height adjustment plate with a thickness corresponding to the height to be adjusted from among several types of height adjustment plates with different thicknesses.

According to this embodiment, by providing multiple types of height adjustment plates with different thicknesses, the floor beam support members can be stably connected to the foundation after adjusting the floor beams and floor beam support members to various adjustment heights.

As can be understood from the above explanation, the floor beam height adjustment method of the present invention makes it possible to adjust the height of the floor beam when connecting the floor beam to the foundation via a floor beam support member.

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. This is a perspective view showing an example of a floor beam support member attached to the foundation. This figure illustrates step A of an example of a method for adjusting the height of a floor beam according to the embodiment. This is a perspective view of an example of a connection structure between a floor beam and a foundation, which was temporarily formed in process A. This figure illustrates step B of an example of a floor beam height adjustment method according to the embodiment. Following Figure 5, this figure illustrates step B, an example of a method for adjusting the height of a floor beam. Following Figure 6, this figure illustrates step B, an example of a method for adjusting the height of floor beams. Following Figure 7, this figure illustrates step B, an example of a method for adjusting the height of a floor beam.

Below, 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. Note that in this specification and the drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[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.

Figure 1 shows a section of a strip foundation 10 (an example of a foundation) having a predetermined length in a specific 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 a rectangular frame shape 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 first-floor floor. However, the overall structure is omitted from the illustration, and here, the connection structure between the strip foundation 10 and the floor beams 50, connected via floor beam support members 30, will be described. In the following description, 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.

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-beams, but the steel column 20 in the illustrated example is formed from square steel pipes.

The mounting bracket 21 is formed by welding multiple steel plates together in a block shape. Anchor bolts 25 are positioned on either side of a vertical steel plate separating the center (Figure 1 shows one of these anchor bolts 25), and the anchor bolts 25 are fixed inside the strip foundation 10 via bolt holes (not shown) in the lower steel plate.

The lower end of the steel column 20 and the steel plate above the mounting bracket 21 are joined by welding. Alternatively, instead of the mounting bracket 21 shown in the illustration, 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.

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 facing the foundation 10) of the contact piece 31 toward the foundation 10 and engages with the top surface 11 of the foundation 10, and a support piece 33 that extends from the front surface (the surface facing the floor beam 50) of the contact piece 31 toward the opposite side of the foundation 10 and supports the floor beam 50. The overall side view shape is approximately Z-shaped.

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 abuts against the side surface 12 of the foundation 10. Here, there may be one locking piece 32 or three or more.

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 sufficient to support the floor beam 50.

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 extending in the vertical direction.

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

When the abutment piece 31 is brought close to the side surface 12 of the foundation 10 in the X3 direction so that it abuts against the side surface 12, 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.

Thus, 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.

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

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, 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.

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 in 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.

Therefore, an intervening piece 37, which has a fourth bolt hole 38 with a larger 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 with the two corresponding fourth bolt holes 38 aligned to the two second bolt holes 35, with their centers aligned.

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, guiding its tip into the third bolt hole 52, and then tightening the second bolt 42, the floor beam 50 is slid in its longitudinal direction, allowing, as shown in Figure 3, the floor beam 50 and the support piece 33 to be connected via the intervening piece 37 using the second bolt 42. Therefore, the intervening piece 37, equipped 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.

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, is screwed into the fifth bolt hole 36.

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 vertically. Then, by tightening or loosening the height adjustment bolt 43, the tip of the height adjustment bolt 43 reacts to the top surface 11 of the foundation 10, allowing the entire floor beam support member 30, including the locking piece 32, to be raised and lowered in the Y1 direction.

During this height adjustment, the first bolt hole 34 in the contact piece 31 is a vertically extending elongated hole, allowing the contact piece 31 to be raised and lowered 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.

The height adjustment of the floor beam support member 30 is actually intended to adjust the height of the floor beam 50. Therefore, with the floor beam 50 bolted to the support piece 33, the top surface of the floor beam 50 is adjusted to the predetermined design level by raising and lowering the floor beam support member 30 and the floor beam 50 using the height adjustment bolt 43.

As shown in Figure 2, the connection structure 90 shown in Figure 8, formed by fixing the floor beam 50 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, this eliminates the concentration of numerous anchor bolts and bolts, including the anchor bolts 25 that fix the steel columns 20, on the top surface 11 of the foundation 10.

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 beams 50 to the foundation 10, the height of the floor beams 50 is adjusted to the design level.

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, 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).

As shown in Figure 5, in the temporary connection structure 80, there is a second clearance C2 between the contact piece 31 and the end 53 of the floor beam 50. Because the floor beam 50 is housed between the shown foundation 10 and another opposing foundation (not shown), it is generally manufactured to be slightly shorter than the length between these two foundations. Therefore, a small second clearance C2 generally exists between the contact piece 31 of the floor beam support member 30 and the end 53 of the floor beam 50, as shown in the illustrated example.

If you attempt to raise the overall height of the floor beam support member 30 and the floor beam 50 while this second clearance C2 remains, 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.

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.

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. This creates a reaction force at the top surface 11 of the foundation 10, causing the floor beam support member 30 that supports the floor beam 50 to move upward (rise) in the Y4 direction.

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.

Next, as shown in Figure 7, a height adjustment plate 70 having a thickness that allows the floor beam 50 to be positioned 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. 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. A height adjustment bolt 43 is then loosely fitted into the recess of the height adjustment plate 70.

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 then installed on the foundation 10 via the floor beam support member 30.

Subsequently, by tightening the first bolt 41 in the Y7 direction, the connection structure 90 between the floor beam 50 and the foundation 10 is formed via the floor beam support member 30 (this completes step B).

According to the illustrated method for adjusting the height of the floor beam, 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.

Furthermore, other embodiments may exist 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 are possible without departing from the spirit of the present invention, and can be appropriately determined according to the application.

10: Foundation (strip foundation)
11: Top surface (top surface)
12: Side view 15: Insert nut 20: Steel column 21: Mounting bracket 25: Anchor bolt 30: Floor beam support member 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 portion 60: Wedge 70: Height adjustment plate 80: Temporary connection structure between floor beam and foundation (temporary connection structure)
90: Connection structure between floor beams and foundation (connection structure)
C1: First clearance (clearance)
C2: Second clearance (clearance)

Claims (4)

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. 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. 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. 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 with a thickness corresponding to the height to be adjusted is selected and used from among multiple types of height adjustment plates with different thicknesses.