Floor structure

Abstract

To solve the problems of conventional technologies, namely, to provide a floor structure that can reduce floor impact noise even with CLT floors.SOLUTION: A floor structure of the present invention comprises a CLT floor and a beam member. The beam member is a member whose beam axis is longer than its beam depth and is fixed to an upper surface of the CLT floor. The floor structure is such that a floor impact sound level is reduced by fixing the beam member to the CLT floor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for reducing floor impact noise, and more specifically to a floor structure in which beams are installed on the floor to reduce floor impact noise. [Background technology]

[0002] For example, in an apartment building or two-story house, impacts such as people walking or objects falling on the floor in an upper floor room cause the floor to vibrate, resulting in an impulsive noise in the room below. This floor impact noise can be divided into "heavy floor impact noise" and "light floor impact noise" depending on the time-frequency characteristics of the impact force. Heavy floor impact noise is generated by the fall of a heavy, soft impact source, such as a person jumping or running around. Light floor impact noise, on the other hand, is generated by the fall of a light, hard impact source, such as the sound of a chair being dragged or the impact noise of tableware such as a knife or spoon being dropped.

[0003] When planning a building, it is naturally planned so that noise to the floors below is not generated or is kept to a minimum. However, when actually used, floor impact noise, such as heavy floor impact noise and light floor impact noise, can become a problem, and in such cases measures to reduce floor impact noise may be implemented. Traditionally, the main method for reducing floor impact noise has been to increase the rigidity of the floor FL, such as by increasing the thickness of the floor FL components as shown in Figure 7(a) or by adding small beams SB to the floor FL as shown in Figure 7(b).

[0004] In addition to measures to increase the rigidity of floor FL, various other measures have been proposed to reduce floor impact noise. For example, Patent Document 1 proposes a floor structure in which plate materials are fixed to the top and bottom of cross members and a bag is placed in the hollow space formed by the top and bottom plate materials. This bag contains a sand-like fluid, and the bag is placed in the hollow space leaving a gap, which is said to reduce the heavy floor impact sound level by the gap and the bag. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-013674 Summary of the Invention [Problem to be solved by the invention]

[0006] Until now, floor floors have often been made of reinforced concrete (RC), but wooden floor floors have also been used, and in recent years, floor floors made of cross-laminated timber (CLT) (hereafter simply referred to as "CLT floors") have also come into use. CLT is a material made by laminating and gluing sawn boards so that the grain direction is perpendicular, and because it can be used as a structural material, it is used as a material for architectural and civil engineering structures, as well as for furniture. CLT floors also have excellent insulation, flame resistance, and heat protection properties, and can be pre-assembled in factories and delivered, thereby shortening the construction period on site.

[0007] However, as mentioned above, floor impact noise may only become a problem after the building is actually in use. In such cases, in order to reduce floor impact noise, retroactive measures, i.e., renovation work, are required, but there are cases where it is difficult to carry out such work while the building is in use. Also, depending on the building, even if the rigidity of the floor FL is increased as shown in Figure 7, sufficient effect may not be obtained. In particular, because the material density of CLT floors is extremely low, it is difficult to achieve the same effect as with RC floor FL, even if the thickness of the members is increased or small beams SB are added.

[0008] The object of the present invention is to solve the problems associated with the prior art, that is, to provide a floor structure that can reduce floor impact noise even when using CLT floors. [Means for solving the problem]

[0009] The present invention was made based on the idea that installing long beams on top of a CLT floor reduces floor impact noise on the floor below, and is an invention based on an unprecedented idea.

[0010] The floor structure of the present invention comprises a CLT floor and beams. The beams are members whose axis is longer than their depth and are fixed to the top surface of the CLT floor. By fixing the beams to the CLT floor, the floor structure reduces floor impact sound levels.

[0011] The floor structure of the present invention can also be one in which beams are fixed to a CLT floor using connecting jigs and connecting bolts. In this case, the connecting jigs are fixed to the top surface of the CLT floor, and the connecting bolts penetrate the beams in the beam depth direction, and the beams are fixed to the CLT floor by screwing the connecting bolts into the connecting jigs.

[0012] The floor structure of the present invention can also be configured to further include an upper floor placed above the CLT floor. In this case, the beams are placed in the space formed by the CLT floor and the upper floor.

[0013] The floor structure of the present invention can also be one in which the CLT floor is formed from partial CLT floors. This CLT floor is constructed by connecting two or more partial CLT floors lined up in the floor width direction. In this case, one beam is arranged so that its beam axis is approximately the same (including the same) as the floor width direction and spans (straddles) two or more CLT floors. Alternatively, two or more beams are arranged so that their beam axis is approximately the same (including the same) as the floor width direction and avoids the connecting points of the partial CLT floors.

[0014] The floor structure of the present invention may also be one in which two beams are arranged so as to be substantially perpendicular to each other (including perpendicular to each other). [Effects of the Invention]

[0015] The floor structure of the present invention has the following advantages: (1) It is possible to reduce the floor impact sound level, which has been a major problem with CLT floors until now. This improves the sound insulation performance of CLT floors and increases the comfort of residents. (2) It can be constructed without affecting structures in use, meaning that floor impact sound levels can be reduced even in buildings that are in use. (3) In the case of a double floor structure, beams can be placed in the space formed by the upper and lower floors, and as a result, the areas where measures are taken are hidden and the view is not spoiled. [Brief explanation of the drawings]

[0016] [Figure 1] 1A is a plan view of the floor structure of the present invention seen from above, and FIG. 1B is a cross-sectional view of the floor structure of the present invention seen in the floor height direction. [Figure 2] A plan view showing a floor structure in which mutually perpendicular beams are fixed to a CLT floor. [Figure 3] (a) is a cross-sectional view showing a connection bolt inserted into a through-hole in a beam and a connection jig fixed to a CLT floor, and (b) is a cross-sectional view showing a state in which the beam is fixed to a CLT floor by the connection bolt and connection jig. [Figure 4] (a) is a plan view showing a schematic diagram of beams arranged to straddle the connecting line and fixed to an interconnected CLT floor, and (b) is a plan view showing a schematic diagram of beams arranged to avoid the connecting line and fixed to an interconnected CLT floor. [Figure 5] A cross-sectional view schematically showing the state in which beams are placed in the double floor space. [Figure 6] (a) is a floor impact sound characteristics diagram showing the test results of heavy floor impact sounds generated by a banging machine, (b) is a floor impact sound characteristics diagram showing the test results of light floor impact sounds generated by a tapping machine, and (c) is a floor impact sound characteristics diagram showing the test results of heavy floor impact sounds generated by dropping a rubber ball. [Figure 7] (a) is a cross-sectional view showing the situation where the thickness of the floor components has been increased, and (b) is a cross-sectional view showing the situation where small beams have been added to the floor. DETAILED DESCRIPTION OF THE INVENTION

[0017] An example of an embodiment of the floor structure of the present invention will be described with reference to the drawings. Figure 1 is a diagram showing a schematic diagram of a floor structure 100 of the present invention, where (a) is a plan view seen from above and (b) is a cross-sectional view taken along the line AA in Figure 1(a). As shown in this figure, the floor structure 100 is mainly composed of beams 110 and CLT floors 120, and can also be composed of connecting jigs, connecting bolts, an upper floor, etc., which will be described later.

[0018] The beams 110 that make up the floor structure 100 are so-called long members whose dimensions in the axial direction (hereinafter referred to as the "beam axis BX") are greater than their cross-sectional dimensions. As shown in Figure 1(b), they are beam-shaped members whose beam axis BX is longer than their beam depth BD. The beams 110 can be made using steel, wood, CLT, gypsum board, concrete, or bagged sand, or they can be made using a combination of these materials. The CLT floor 120, on the other hand, is a plate-shaped member made of CLT. For convenience, the longitudinal direction of the CLT floor 120 (the left-right direction in Figure 1(a)) will be referred to as the "beam height direction," and the horizontal direction perpendicular to this beam height direction (the up-down direction in Figure 1(a)) will be referred to as the "beam width direction." In other words, Figure 1(b) is a cross-sectional view taken along the beam height direction.

[0019] The inventors of the present application have discovered that installing long members on a CLT floor 120 can extremely effectively reduce floor impact sounds, such as heavy floor impact sounds and light floor impact sounds. Therefore, the floor structure 100 of the present invention is configured so that beams 110 are fixed to the upper surface of the CLT floor 120. For example, as shown in Figure 1(a), the beams 110 can be fixed to the CLT floor 120 with the beam axis BX positioned approximately parallel (including parallel) to the beam width direction. Note that while Figure 1(a) shows an example in which one beam 110 is fixed to the CLT floor 120, two or more beams 110 can also be fixed to the CLT floor 120.

[0020] Furthermore, instead of arranging the beams 110 so that the beam axis BX is in the beam width direction, the beams 110 can also be fixed to the CLT floor 120 so that the beam axis BX is approximately parallel (including parallel) to the beam length direction. Alternatively, as shown in Figure 2, beams 110 with the beam axis BX in the beam width direction and beams 110 with the beam axis BX in the beam length direction can be combined and fixed to the CLT floor 120. Note that Figure 2 shows an example in which the beams 110 are approximately perpendicular to each other, but of course the beams 110 can also be arranged so that they intersect at any angle.

[0021] Various conventional methods can be used to fasten the beam 110 to the top surface of the CLT floor 120, such as using nails or screws or adhesives. For example, in FIG. 3, the beam 110 is fastened to the CLT floor 120 using a connecting jig 130 and a connecting bolt 140. As shown in FIG. 3(a), the connecting jig 130 is fixed to the CLT floor 120 with nails or screws, and threads are provided on its inner periphery. The beam 110 is provided with a through-hole HB for inserting the connecting bolt 140, and a storage space AS for accommodating the connecting jig 130. As shown in FIG. 3(b), the connecting bolt 140 is inserted through the through-hole HB, and the beam 110 is placed on the CLT floor 120 so that the connecting jig 130 is accommodated in the storage space AS. The connecting bolt 140 is then screwed into the connecting jig 130, thereby fastening the beam 110 to the CLT floor 120. It is advisable to arrange the combination of the connecting jig 130 and the connecting bolt 140 at two or more locations along the beam axis BX with an interval therebetween.

[0022] A CLT floor 120 can also be formed by connecting so-called component CLT floors (hereinafter referred to as "partial CLT floors 120P"). For example, the CLT floor 120 shown in Figure 4 is formed by arranging three partial CLT floors 120P side by side in the floor width direction and connecting them. Note that various conventional methods can be used to connect the partial CLT floors 120P together. For example, joints 120J can be provided at adjacent positions of the partial CLT floors 120P, and these joints 120J can be joined using plywood and screws, etc.

[0023] When a beam 110 is fixed to a CLT floor 120 in which two or more partial CLT floors 120P are connected (hereinafter referred to as a "connected CLT floor 120" for convenience), the beam 110 can be positioned so that it spans multiple partial CLT floors 120P, in other words, so that it straddles the points where the beams 110 are connected (hereinafter referred to as "connecting lines"). For example, the beam 110 shown in Figure 4(a) is positioned so that its beam axis BX is in the connecting direction of the partial CLT floors 120P (the floor width direction in this figure) and so that it spans three partial CLT floors 120P (i.e., so that it straddles two connecting lines), and is then fixed to the CLT floor 120. By using a long beam 110 in this way, it is also possible to install the beam 110 to connect main girders, for example.

[0024] When fixing beams 110 to a connecting CLT floor 120, multiple beams 110 can be arranged to avoid the connection lines. For example, the beams 110 shown in Figure 4(b) are arranged independently on each of the three partial CLT floors 120P so that their beam axes BX are in the connection direction of the partial CLT floors 120P (the floor width direction in this figure), and are then fixed to the CLT floor 120. By arranging the beams 110 with gaps in this way, it is possible to lay pipes, wiring, etc. in those gaps.

[0025] The floor structure 100 of the present invention can also be a double floor (particularly a dry double floor) structure consisting of a CLT floor 120 and an upper floor 150 arranged above and below. In this case, as shown in Figure 5, beams 110 can be placed in the space SP formed by the lower CLT floor 120 and the upper upper floor 150. This makes it possible to hide the area where floor impact noise is to be prevented (i.e., beams 110), meaning that the appearance of the beams 110 will not be marred by being visible on the floor below, and there is no need to worry about the fit of the ceiling pockets. As a result, the design and aesthetic appeal of the building can be maintained while also improving sound insulation performance.

[0026] (Test results) The inventors conducted tests to confirm the effectiveness of the floor structure 100 of the present invention. Figure 6 shows floor impact sound characteristic diagrams showing the test results, with (a) the test results for heavy floor impact sound generated by a banging machine, (b) the test results for light floor impact sound generated by a tapping machine, and (c) the test results for heavy floor impact sound generated by dropping a rubber ball. As shown in these diagrams, in all tests, improvements of approximately 3 to 5 dB were observed at 1.5 Hz and 3 Hz. In other words, it was confirmed that the floor structure 100 of the present invention is effective in reducing heavy floor impact sound and light floor impact sound. [Industrial Applicability]

[0027] The floor structure of the present invention can be used in buildings such as apartment complexes, detached houses, and office buildings, as well as in all kinds of buildings such as school buildings and warehouses. [Explanation of symbols]

[0028] 100 Floor structure of the present invention 110 Beams (for floor construction) 120 (Floor structure) CLT floor 120J (CLT floor) joint 120P (CLT floor) Partial CLT floor 130 (Floor structure) connection jig 140 (Floor structure) connecting bolt 150 (floor structure) upper floor AS storage space BD Liang Sei BX beam axis FL floor HB through hole SB Kobe SP space

Claims

1. CLT floor and A beam member whose beam axis is longer than the beam depth, The beam is fixed to the upper surface of the CLT floor, By fixing the beams, floor impact noise was reduced. A floor structure characterized by:

2. A connecting jig is fixed to the upper surface of the CLT floor, The beam material is fixed to the CLT floor by threading a connecting bolt that penetrates the beam material in the beam depth direction into the connecting jig.

2. The floor structure according to claim 1.

3. Further provided is an upper floor disposed above the CLT floor; The beams are arranged in a space formed by the CLT floor and the upper floor.

2. The floor structure according to claim 1.

4. The CLT floor has a structure in which two or more partial CLT floors arranged in the floor width direction are connected together, One beam is arranged so that the beam axis is in the same or approximately the same direction as the floor width direction and spans two or more of the CLT floors.

2. The floor structure according to claim 1.

5. The CLT floor has a structure in which two or more partial CLT floors arranged in the floor width direction are connected together, Two or more of the beams are arranged so that the beam axis is in the same or approximately the same direction as the floor width direction and so as to avoid the connection points of the partial CLT floor.

2. The floor structure according to claim 1.

6. The two beams are arranged so as to be perpendicular or substantially perpendicular to each other.

2. The floor structure according to claim 1.

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