bed bundle

Abstract

The present invention provides a steel floor support capable of dampening or absorbing vibrations not only in response to vertical shaking during earthquakes, but especially in response to horizontal shaking. [Solution] The structure comprises a support column (13) that extends integrally from a base member (12) fixed to a foundation structure (10), a screw shaft (15) that extends integrally from a floor support member (14) that supports a main beam (11), a straight pipe (16) that is inserted and fitted in a removable, loosely coupled state between the upper and lower parts of the screw shaft (15) and the support column (13), a height adjustment nut (17) and an adjustment lock nut (18) that are screwed onto the screw shaft (15) to connect the straight pipe (16) and the screw shaft (15), and a spring washer (19) interposed between the lower end surface (17b) of the height adjustment nut (17) and the detached upper end surface (16a) of the straight pipe (16).

Description

Technical Field

[0001] The present invention relates to a floor bundle that supports a floor receiving member of a wooden building. Despite being a steel product, it is devised to exhibit a damper function and escape vibrations during an earthquake.

Background Art

[0002] Steel floor bundles capable of adjusting elevation (installation height) without using a general turnbuckle are disclosed in Patent Documents 1 and 2. In both of them, a screw shaft hanging from a floor receiving member that supports a large draw and a cylindrical body standing from a base member attached to a foundation structure are assembled in a coupled state via an elevation adjustment nut and an adjustment lock nut that are screwed and fastened to the screw shaft. It is considered the most approximate known technology to the present invention in that respect.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, taking the floor load support described in Patent Document 1 as a representative example, in the configuration of the floor load support (floor bundle), not only is the screw portion (22) of the male screw member (20) fixed to the floor receiving member (10), but also the body portion (41) made of a pipe of the support member (40) is fixed (welded) to the base plate (42).

[0005] Moreover, the flange (31a) of the lifting nut (31), which forms the lifting and locking mechanism (30), is directly locked to the upper end of the body (pipe) (41) that extends integrally from the base plate (42). The flange (31a) of the lifting nut (31) is directly pressed from above by the pressing portion (32a) of the cylindrical member (32), and the lifting adjustment state is locked by a lock cap nut (33) that covers the lifting nut (31) from above.

[0006] Therefore, as an overall rigid assembly structure, it does not exhibit damping function, and coupled with the fact that the body (pipe) (41) of the support member (40) is made of a large-diameter steel pipe with high bending rigidity, even if it can be expected to have an effect of earthquake resistance and vibration control against vertical shaking, it is impossible to dissipate the vibrations during an earthquake, especially horizontal shaking, and to obtain a base isolation effect.

[0007] Furthermore, because there is an extremely large gap between the body (pipe) (41) of the support member (40), which is made of a steel pipe with high bending rigidity, and the threaded portion (22) of the male threaded member (20) inserted into its hollow interior from above, if the upper end of the body (pipe) (41) of the support member (40) is not covered and tightened for a certain length by a separate cylindrical member (32), and the pressing portion (32a) of the cylindrical member (32) is not pressed from above by the housing portion (33a) of the lock cap nut (33), then in the event of a lateral shaking of an earthquake, the neck of the floor load support (floor joist) will wobble as it swings with the joint where the lifting / locking means (30) is interposed as a fulcrum, which may cause loosening of the joint and, consequently, damage to the fixing portion of the body (pipe) (41) to the base plate (42).

[0008] Furthermore, the lifting and locking mechanism (30) requires a special lifting nut (31) with a flange (31a) and a special locking cap nut (33) with a storage section (33a) to house the lifting nut (31). The cylindrical member (32) is also required as a separate part. As a result, the configuration of the floor load support (floor joist) becomes complex and specialized, making it difficult to expect mass production benefits or long-term durability. [Means for solving the problem]

[0009] The present invention aims to improve these problems, and to achieve this objective, as a floor support, claim 1 provides a support column that is integrally suspended from a base member attached and fixed to the foundation structure of a wooden building,

[0010] Similarly, a screw shaft that hangs integrally from the floor support member that supports the main beam of a wooden building toward the aforementioned support column,

[0011] A straight pipe is inserted and fitted into the space between the screw shaft and the support column in a loosely interlocking state, and

[0012] To connect the straight pipe and the screw shaft, a lifting adjustment nut and an adjustment lock nut are screwed and fastened to the screw shaft,

[0013] It comprises a vibration damping or absorbing spring washer interposed between the lower end surface of the height adjustment nut and the upper end surface of the straight pipe,

[0014] By further rotating the above-mentioned height adjustment nut from the position where it is received by the detached upper end surface of the straight pipe, the installation height of the floor support member is adjusted,

[0015] The adjustment state of the installation height is characterized by locking the spring washer into a compressed state by the tightening and downward force of the adjustment lock nut that is stacked on top of the height adjustment nut.

[0016] In that case, in claim 2, a straight pipe having a circular cross-section with an inner diameter 0.3 mm to 0.5 mm larger than the outer diameter is inserted and fitted in a freely detachable manner between the screw shaft and the support column having the same outer diameter as each other in the vertical direction.

[0017] In addition, in claim 3, the insertion length of the straight pipe with respect to the screw shaft and the support column is set to at least 30 mm in each case.

[0018] On the other hand, in claim 4, a first screw shaft integrally erected from a base member attached and fixed to the foundation structure of a wooden building,

[0019] A second screw shaft integrally hanging from a floor receiving member that also supports the large brace of the wooden building toward the first screw shaft,

[0020] A straight pipe that is inserted and fitted in a freely detachable play state between the second screw shaft and the first screw shaft in the vertical direction,

[0021] For connecting the straight pipe and the first screw shaft, a primary lifting adjustment nut and a primary adjustment lock nut that are respectively screwed and fastened to the first screw shaft,

[0022] Similarly, for connecting the straight pipe and the second screw shaft, a secondary lifting adjustment nut and a secondary adjustment lock nut that are respectively screwed and fastened to the second screw shaft,

[0023] A first spring washer for vibration damping or absorption inserted between the cut lower end surface of the straight pipe and the upper end surface of the primary lifting adjustment nut,

[0024] A second spring washer for vibration damping or absorption inserted between the lower end surface of the secondary lifting adjustment nut and the cut upper end surface of the straight pipe,

[0025] After positioning and adjusting the installation height of the straight pipe by rotating the primary lifting adjustment nut and locking the adjusted state by tightening the primary adjustment lock nut,

[0026] By further rotating the secondary lifting adjustment nut from the receiving state by the cut-off upper end surface of the straight pipe, the installation height of the floor receiving member is adjusted, and

[0027] it is characterized in that the adjustment state of the installation height is locked in the overlapping compression state of the first and second spring washers by the tightening and pressing force of the secondary adjustment lock nut stacked on the secondary lifting adjustment nut.

[0028] In that case, in claim 5, a straight pipe with a circular cross-section having an inner diameter 0.3 mm to 0.5 mm larger than the outer diameter is inserted and fitted in a freely removable manner between the upper and lower portions of the second screw shaft and the first screw shaft having the same outer diameter.

[0029] Furthermore, in claim 6, the insertion depth of the straight pipe with respect to the second screw shaft and the first screw shaft is set to at least 30 mm in each case.

Effect of the Invention

[0030] According to the configurations of claim 1 and claim 4, there is an effect that all the problems of the prior art described at the beginning can be solved.

[0031] That is, according to the above configuration of claim 1, a straight pipe in an installed state standing vertically by an appropriate fixed length (height) from the base member and a screw shaft hanging down from a floor receiving member supporting a large draw are screwed and fastened to the screw shaft. They are connected at the cut-off upper end position of the straight pipe via the lifting adjustment nut and its adjustment lock nut. If the lifting adjustment nut is further rotated from the receiving state by the straight pipe, the screw shaft moves relatively in the vertical direction. Therefore, the installation height of the floor beam can be adjusted only by the so-called short lifting stroke portion above the upper end position of the straight pipe, and the work in a narrow under-floor space can be performed efficiently.

[0032] Furthermore, the straight pipe is a physically independent component that extends vertically between the screw shaft, which hangs integrally from the floor support member, and the support column, which rises integrally from the base member. It is inserted and fitted into both the screw shaft and the support column in a loosely interlocking manner, and because it is not a rigid assembly structure, it naturally acts as a damper when subjected to lateral shaking (vibrations from the side) during an earthquake, allowing the vibrations to dissipate and providing a seismic isolation effect.

[0033] Furthermore, a vibration damping or absorbing spring washer is interposed between the lower end surface of the height adjustment nut screwed onto the aforementioned screw shaft and the upper end surface of the straight pipe. When the floor joist's installation height is locked (fixed) by the tightening force of the adjustment lock nut, the spring washer is compressed. This allows the accumulated restorative compression performance to act as a damper to counteract vertical shaking (vertical vibration) during earthquakes, thus contributing to the achievement of seismic isolation.

[0034] Furthermore, since there is no need to engrave male threads on the straight pipes, thick-walled steel pipes (single pipes) with high support strength against vertical loads can be used, and common hexagonal nuts can be used for the height adjustment nuts and their adjustment lock nuts, and the assembly work can be easily carried out, the required structure of the floor support is remarkably simple, and it also has the effect of producing floor support with excellent mass production and long-term durability.

[0035] On the other hand, according to the configuration of claim 4, in addition to achieving the above-mentioned effects based on the configuration of claim 1, the installation height of the straight pipe can be adjusted and locked to an even higher position, so to speak, by using the primary height adjustment nut and its adjustment lock nut on the first screw shaft that is integrally suspended from the base member, thereby providing an effective floor joist suitable for wooden buildings with high underfloor heights.

[0036] Furthermore, after adjusting the installation height of the floor joist by rotating the secondary height adjustment nut on the second screw shaft, when the secondary adjustment lock nut is tightened from above onto the secondary height adjustment nut to lock the adjustment state, the downward force compresses not only the second spring washer but also the first spring washer, and the restorative compressive performance that acts as a damper is accumulated in a superimposed manner. This has the advantage of reliably and stably obtaining the seismic isolation effect against vertical shaking during earthquakes.

[0037] Furthermore, in either claim 1 or 4, if the configuration of its dependent claims 2 or 5 is adopted, an even more stable seismic isolation effect can be obtained to cope with lateral shaking during an earthquake, and it also has the effect of preventing the connection between the straight pipe and the screw shaft, and the connection between the straight pipe and the second screw shaft, from wobbling and loosening in a manner similar to a swaying head.

[0038] Furthermore, if the configurations of dependent claims 3 and 6 are adopted, there is an effect that can prevent the straight pipe from coming loose from the screw shaft and / or the support column and the first and second screw shafts before the wooden building collapses due to a strong earthquake of magnitude 6 or higher. [Brief explanation of the drawing]

[0039] [Figure 1] This is a front view showing the disassembled state of a floor joist according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the usage state of the floor support according to the first embodiment described above. [Figure 3] This is a cross-sectional view taken along line 3-3 in Figure 2. [Figure 4] This is a cross-sectional view showing the state of use of a floor joist according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0040] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Figures 1 to 3 show a steel floor joist (A1) according to the first embodiment, and as is clear from the usage state in Figure 2, it is inserted between the foundation structure (10) of a house or other various wooden building and the main beam (11) of the wooden building so as to be adjustable in height (lifting level), and supports the load of the main beam (11).

[0041] The floor joist (A1) of the first embodiment includes a support column (13) that hangs down from a base member (12) which is attached and fixed to a foundation stone, concrete foundation, raft foundation, or other foundation structure (10), a screw shaft (15) that hangs down from a floor support member (14) that supports the main beam (11) toward the support column (13), and a removable, loose joint that spans the vertical space between the screw shaft (15) and the support column (13) (so as to functionally connect the screw shaft and the support column). It consists of a straight pipe (16) that is inserted and fitted into a form, a lifting (installation height) adjustment nut (17) and an adjustment lock nut (18) that are screwed onto the screw shaft (15) to connect the straight pipe (16) and the screw shaft (15) at the upper end position of the straight pipe (16), and a spring washer (19) interposed between the lower end surface (17b) of the lifting adjustment nut (17) and the upper end surface (16a) of the straight pipe (16).

[0042] Of the above components, the base member (12) is a steel plate having a certain thickness (e.g., 5.1 mm) and a planar shape such as a rectangle. The large diameter bottom (13a) of the support column (13), which is inserted into the through hole (12a) in the center of the base member (12), is fixed and integrated with the base member (12) itself by crimping and / or spot welding. (12b) is the mounting hole for the base member (12) to the foundation structure (10), through which nails or tapping screws will be inserted. In addition, elongated holes for inserting anchor bolts and small air vents may also be provided.

[0043] Furthermore, the support column (13) is a steel rod having a certain outer diameter (D1) (for example, 12.3 mm) and length (height) (L1) (for example, 30 mm), and it is integrally suspended from the center of the base member (12) for a certain length (height) (L1).

[0044] On the other hand, the floor support member (14) is a steel plate having approximately the same thickness (e.g., 5.1 mm) and size and planar shape as the base member (12). In the illustrated embodiment, it is flat, but it can also be bent into an L-shape or U-shape. Furthermore, the large diameter head (15a) of the screw shaft (15) inserted into the through hole (14a) in its center and the floor support member (14) itself are fixed and integrated together by riveting and / or spot welding. Note that mounting holes for fixing the floor support member (14) to the main beam (11) with nails or tapping screws are omitted from the illustration.

[0045] The screw shaft (15) is a bolt with a head or flange that has the same outer diameter (D2) (for example, 12.3 mm) as the support column (13) and a fixed length (height) (L2) (for example, 104 mm) that is longer than the support column (13). It hangs down integrally from the center of the floor support member (14) by that fixed length (height) (L2) and faces the support column (13) that rises from the base member (12).

[0046] The straight pipe (16) described above is made of a steel pipe with a circular cross-section having a fixed outer diameter (D3) (for example, 17.3 mm) and a fixed inner diameter (S) (for example, 12.7 mm) that is larger than the outer diameter (D2) of the screw shaft (15) and the outer diameter (D1) of the support column (13). The upper end of the pipe is inserted into the lower end of the screw shaft (15), and the remaining lower end is inserted into the upper end of the support column (13), both in a loosely fitted state that allows for easy insertion and removal.

[0047] In other words, in the illustrated embodiment, a certain clearance (e.g., 0.4 mm) is secured between the straight pipe (16) with a constant thickness (e.g., 2.3 mm) and the screw shaft (15) and support column (13) which have the same outer diameter (D1) (D2). Therefore, the straight pipe (16), acting as a physically independent component, is in a loose engagement state with the screw shaft (15) and support column (13), and together they can exert a damping function against lateral shaking during an earthquake, effectively attenuating or absorbing the vibrations of that lateral shaking.

[0048] In that case, the 0.4 mm exemplified above as a certain clearance is the optimal dimension in the illustrated embodiment, but it is preferable to set it within the numerical range of 0.3 mm to 0.5 mm for the following reasons. If the above clearance is narrower than 0.3 mm, the straight pipe (16) is more likely to be physically connected to the screw shaft (15) and / or the support column (13), and vibrations will be transmitted, which is undesirable. On the other hand, if it is wider than 0.5 mm, the straight pipe (16) will be more prone to shaking, and the part connected to the screw shaft (15) via the height adjustment nut (17) and its adjustment lock nut (18) will become loose and wobbly, reducing the support strength against vertical loads, which is also undesirable.

[0049] Furthermore, it is preferable to set the insertion depth (W1)(W2) of the straight pipe (16) with respect to the screw shaft (15) and the support column (13) to at least approximately the same 30 mm at both the upper and lower ends of the straight pipe (16). This way, even if the straight pipe (16) is subjected to vertical shaking during an earthquake, there is no risk of it coming loose from the screw shaft (15) and / or the support column (13). Even with this set dimension secured, the event of it coming loose is considered to be equivalent to the collapse of a wooden building, based on past earthquake experience.

[0050] Paradoxically, this means that if there is at least 30mm of insertion depth (W1)(W2), the straight pipe (16) will not come loose from the screw shaft (15) or support column (13) even in the event of an earthquake of magnitude 6 or so, which could cause wooden buildings to tilt or collapse.

[0051] The length (height) (L3) of the straight pipe (16) can be selected to an appropriate length (height) depending on the height of the underfloor space in a wooden building and other construction conditions, as long as sufficient insertion space (W1) (W2) is secured between the threaded shaft (15) and the support column (13).

[0052] Furthermore, the height adjustment nut (17) and the adjustment lock nut (18) are both common hexagonal nuts of roughly the same size. They are screwed onto the screw shaft (15) of the floor support member (14) from below at their tips. The lower height adjustment nut (17) adjusts the installation height (height level) of the floor support member (14), and the upper adjustment lock nut (18), which is stacked on top of it, locks (fixes) the height adjustment state.

[0053] In this case, as shown in the usage state in Figure 2, the lower end surface (17b) of the height adjustment nut (17) is positioned opposite the upper end surface (16a) of the straight pipe (16), which is inserted from above and fitted onto the support column (13) that extends vertically from the base member (12) and is in a state where it is hanging down by a suitable fixed length (height) (L3). The height adjustment nut (17) is received by the straight pipe (16), and once it is received, it cannot be screwed down any further. The lower end surface (16b) of the straight pipe (16) is in contact with the base member (12) and is in a receiving state.

[0054] In other words, by rotating the lifting adjustment nut (17) further from the receiving state by the detached upper end surface (16a) of the straight pipe (16), the screw shaft (15) of the floor support member (14), which is screwed with the nut, will relatively advance (move) in the vertical direction, thereby allowing the installation height (lifting level) of the floor support member (14) to be adjusted.

[0055] In this configuration, the spring washer (19) is inserted and set on the screw shaft (15) as an interposition between the lower end surface (17b) of the height adjustment nut (17) and the detached upper end surface (16a) of the straight pipe (16). When the height adjustment state of the floor support member (14) by the height adjustment nut (17) is subsequently locked (fixed) by the tightening force of the adjustment lock nut (18), the spring washer (19) is compressed, and the accumulated restorative elasticity is used to dissipate, dampen, or absorb vibrations during an earthquake, especially vertical shaking. The spring washer (19) also serves to prevent the height adjustment nut (17) and its adjustment lock nut (18) from loosening.

[0056] According to the above configuration of the first embodiment, the lifting adjustment nut (17) for adjusting the installation height (lifting level) of the floor joist (A1) is received by the cut upper end surface (16a) of the straight pipe (16) which is hanging down by an appropriate length (height) (L3) from the base member (12), and is prevented from screwing (moving) further downward. Therefore, by rotating the lifting adjustment nut (17) by a short lifting stroke above the cut upper end surface (16a) of the straight pipe (16), the screw shaft (15) is relatively screwed up and down, and the lifting adjustment work of the floor joist (A1) can be performed quickly and easily. Since it is not necessary to rotate the lifting adjustment nut (17) all the way to the base member (12), it is useful for improving workability in narrow underfloor spaces.

[0057] Next, Figure 4 shows a steel floor joist (A2) according to the second embodiment of the present invention, and the differences in its configuration from the first embodiment shown in Figures 1 to 3 are summarized below.

[0058] In other words, in the floor support (A2) of the second embodiment, instead of the support column (13) of the first embodiment which does not have a male thread, a first screw shaft (20) having a male thread is integrally erected from the center of the base member (12). Moreover, a primary adjustment lock nut (21) and a primary height adjustment nut (22) are screwed onto the first screw shaft (20) in order from the top (tip side), and a first spring washer (23) that abuts against the upper end surface (22a) of the primary height adjustment nut (22) is also inserted and set in a stacked manner.

[0059] In contrast, the second screw shaft (24) that hangs down from the center of the floor support member (14) supporting the main beam (11) toward the first screw shaft (20) is the same as the screw shaft (15) in the first embodiment, and the secondary height adjustment nut (25) and secondary adjustment lock nut (26) that are screwed and fastened to the second screw shaft (24) are the same as the height adjustment nut (17) and adjustment lock nut (18) that are screwed and fastened to the screw shaft (15) in the first embodiment, and the second spring washer (27) that is inserted and set on the second screw shaft (24) is the same as the spring washer (19) in the first embodiment.

[0060] As is clear from Figure 4, the floor joist (A2) of the second embodiment also has the same straight pipe (16) as in the first embodiment, but unlike the first embodiment, the straight pipe (16) is inserted and fitted in a loosely fitting state that can be inserted and removed, across the upper and lower mutual space between the second screw shaft (24) and the first screw shaft (20) (so as to functionally connect the first and second screw shafts), and the detached upper and lower end faces (16a) (16b) of the straight pipe (16) are sandwiched between the second spring washer (27) and the first spring washer (23).

[0061] In that case, the outer diameters (D1) and (D2) of the first and second screw shafts (20) and (24) are the same, and the inner diameter (S) of the straight pipe (16) is 0.4 mm larger than these, as in the first embodiment described above. Since the straight pipe (16) is physically an independent component from the first and second screw shafts (20) and (24), and maintains a constant clearance of 0.4 mm, it can still exert a damping function against lateral shaking during earthquakes and achieve seismic isolation. The length (height) (L3) of the straight pipe (16) can be selected appropriately, as in the first embodiment described above, but it is desirable to set the insertion allowance (W1) and (W2) for the first and second screw shafts (20) and (24) to at least approximately the same 30 mm.

[0062] Since the other configurations in the second embodiment are substantially the same as those in the first embodiment, a detailed explanation will be omitted. However, when adjusting the installation height (lifting level) of the floor support (A2) according to the second embodiment, first, the primary lifting adjustment nut (22) and its primary adjustment lock nut (21) on the first screw shaft (20) are rotated to a suitable height position that receives the detached lower end surface (16b) of the straight pipe (16), and the positioning adjustment state of the installation height of the straight pipe (16) is locked by tightening the adjustment lock nut (21).

[0063] Subsequently, similar to the first embodiment described above, the secondary height adjustment nut (25), which is received on the detached upper end surface (16a) of the straight pipe (16), is rotated to screw (move) the second screw shaft (24) vertically relative to it, thereby adjusting the height of the floor support member (14). After that, the secondary height adjustment nut (25) is locked in place by the tightening downward force of the secondary adjustment lock nut (26) stacked on top of it, so as not to loosen.

[0064] When the installation height adjustment state of the floor joist (A2) is locked by the tightening downward force of the secondary adjustment lock nut (26), not only the second spring washer (27) but also the first spring washer (23) are compressed simultaneously or sequentially, and restorative elastic performance that functions as a damper is accumulated in a superposition manner.

[0065] According to the configuration of the second embodiment, compared to the configuration of the first embodiment, the length (height) (L1) of the first screw shaft (20) corresponding to the support column (13) is longer (taller), and the installation height of the straight pipe (16) that is supported by it can be adjusted to a higher position, so to speak, via the primary height adjustment nut (22) and its primary adjustment lock nut (21). Therefore, it is useful as a floor joist (A2) for wooden buildings with high underfloor height, and the installation height of the main beam (11) can be adjusted efficiently.

[0066] Although preferred first and second embodiments of the present invention have been specifically described, none of them limit the scope of the claims of the present invention, and a wide variety of modifications can be made as long as they do not deviate from the scope of the claims. [Explanation of Symbols]

[0067] (10)...Foundation structure (11)...Obiki (12) Base component (13)...post (14) Floor support member (15) ... Screw shaft (16)...Straight pipe (17) Height adjustment nut (18) Adjustable lock nut (19) ····Spring washer (20) ····First screw shaft (21) Primary adjustment lock nut (22) Primary height adjustment nut (23) ····First spring washer (24) ····Second screw shaft (25)...Secondary height adjustment nut (26)...Secondary adjustment lock nut (27) ····Second spring washer (D1)(D2)(D3)...Outer diameter (L1)(L2)(L3)...Length (back height) (S)...Inner diameter (W1)(W2)... Insertion fee

Claims

1. A support column (13) that extends vertically as a whole from a base member (12) which is attached and fixed to the foundation structure (10) of a wooden building, and Similarly, a screw shaft (15) hangs integrally from the floor support member (14) that supports the main beam (11) of the wooden building toward the support column (13), A straight pipe (16) is inserted and fitted into the space between the screw shaft (15) and the support column (13) in a loosely interlocking state, and In order to connect the straight pipe (16) and the screw shaft (15), a lifting adjustment nut (17) and an adjustment lock nut (18) are screwed and fastened to the screw shaft (15), The system includes a vibration damping or absorbing spring washer (19) interposed between the lower end surface (17b) of the height adjustment nut (17) and the detached upper end surface (16a) of the straight pipe (16), By further rotating the above-mentioned height adjustment nut (17) from the position where it is received by the detached upper end surface (16a) of the straight pipe (16), the installation height of the floor support member (14) is adjusted, A floor joist characterized in that the adjustment state of the installation height is locked in a compressed state of the spring washer (19) by the tightening and pressing force of the adjustment lock nut (18) which is stacked on the height adjustment nut (17).

2. The floor support according to claim 1, characterized in that a straight pipe (16) with a circular cross-section and an inner diameter (S) that is 0.3 mm to 0.5 mm larger than the outer diameters (D2) and (D1) of a screw shaft (15) and a support column (13), which have the same outer diameters (D2) and (D1), is inserted and fitted in a removable manner between them.

3. The floor joist according to claim 1, characterized in that the insertion depth (W1) (W2) of the straight pipe (16) with respect to the screw shaft (15) and the support column (13) is set to at least 30 mm.

4. A first screw shaft (20) extends vertically from a base member (12) which is attached and fixed to the foundation structure (10) of a wooden building, Similarly, a second screw shaft (24) hangs integrally from the floor support member (14) that supports the main beam (11) of the wooden building toward the first screw shaft (20), A straight pipe (16) is inserted and fitted into the space between the second screw shaft (24) and the first screw shaft (20) in a loosely interlocked state, and In order to connect the straight pipe (16) and the first screw shaft (20), a primary height adjustment nut (22) and a primary adjustment lock nut (21) are screwed and fastened to the first screw shaft (20), Similarly, in order to connect the straight pipe (16) and the second screw shaft (24), a secondary height adjustment nut (25) and a secondary adjustment lock nut (26) are screwed and fastened to the second screw shaft (24), A first spring washer (23) for vibration damping or absorption is interposed between the detached lower end surface (16b) of the straight pipe (16) and the upper end surface (22a) of the primary lifting adjustment nut (22), The system includes a second spring washer (27) for vibration damping or absorption, which is interposed between the lower end surface (25b) of the secondary height adjustment nut (25) and the detached upper end surface (16a) of the straight pipe (16). The installation height of the straight pipe (16) is positioned and adjusted by rotating the primary height adjustment nut (22) described above, and the adjusted state is locked by tightening the primary adjustment lock nut (21), By further rotating the secondary height adjustment nut (25) from the position where it is received by the detached upper end surface (16a) of the straight pipe (16), the installation height of the floor support member (14) is adjusted, A floor joist characterized in that the adjustment state of the installation height is locked in a superimposed compressed state of the first and second spring washers (23) and (27) by the tightening downward force of the secondary adjustment lock nut (26) which is stacked on the secondary height adjustment nut (25).

5. The floor support according to claim 4, characterized in that a straight pipe (16) with a circular cross-section and an inner diameter (S) that is 0.3 mm to 0.5 mm larger than the outer diameters (D2) and (D1) of the second screw shaft (24) and the first screw shaft (20), which have the same outer diameters (D2) and (D1), is inserted and fitted into the space between them so as to be easily inserted and removed.

6. The floor joist according to claim 4, characterized in that the insertion allowance (W1) (W2) of the straight pipe (16) with respect to the second screw shaft (24) and the first screw shaft (20) is set to at least 30 mm.

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