Soundproof structure

Abstract

Soundproofing is enhanced through a soundproof structure. [Solution] The soundproof structure 1 comprises a corrugated cardboard frame 2 having a top wall portion 2U, a pair of end wall portions 2E, a pair of side wall portions 2S, and extension pieces 2P extending from each of the side wall portions 2S, and being envelope-shaped when unfolded and picture frame-shaped when assembled, and a sound-absorbing member 3 having a top member 3U housed in the top wall portion 2U, an end member 3E housed in the end wall portion 2E, and a side member 3S housed in the side wall portion 2S. The pair of end wall portions 2E have an outer end wall portion 21E and an inner end wall portion 22E. The pair of side wall portions 2S have an outer wall portion 21S and an inner wall portion 22S. An end member 3E is sandwiched between the outer end wall portion 21E and the inner end wall portion 22E, and a side member 3S is sandwiched between the outer wall portion 21S and the inner wall portion 22S. Attachment grooves 21G and 22G are provided to hook the extension pieces 2X and 2Y onto each other, and the extension piece 2P is positioned on the inside in the front-rear direction relative to the end member 3E.

Description

Technical Field

[0001] The present invention relates to a sound insulation structure for preventing noise.

Background Art

[0002] As one of the noise countermeasures, a cylindrical sound insulation structure surrounding the four sides of an internal space where noise sources such as vacuum pumps and generators are arranged is known. For example, Patent Document 1 proposes a sound insulation box having a rectangular cylindrical structure surrounding the front, rear, left, and right of a generator. This sound insulation box has a sound insulation mat attached to the rectangular cylindrical side plates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the sound insulation box having a rectangular cylindrical structure as described above, although the front, rear, left, and right of the noise source are surrounded, the upper part of the noise source is not covered, so noise leaks out above the noise source. Therefore, there is room for improvement in enhancing the sound insulation performance. The sound insulation structure of the present case was devised in view of the above problems, and one of its purposes is to enhance the sound insulation performance. Note that not limited to this purpose, the actions and effects derived from each configuration shown in the "Mode for Carrying Out the Invention" described later, which are actions and effects not obtainable by the conventional technology, can also be positioned as other purposes of the present case.

Means for Solving the Problems

[0005] The sound insulation structure disclosed here has the following configurations (1) to (4). (1) A soundproof structure that surrounds the internal space where the noise source is located, The assembly includes a top wall portion positioned above the internal space in the assembled state and, in the unfolded state, positioned in the center of the first direction corresponding to the front of the assembled state and the second direction corresponding to the rear of the assembled state, as well as in the center of the third direction corresponding to the left of the assembled state and the fourth direction corresponding to the right of the assembled state; a front wall portion positioned in front of the internal space in the assembled state and extending from the top wall portion in the first direction in the unfolded state; and a rear wall portion positioned behind the internal space in the assembled state and extending from the top wall portion in the second direction in the unfolded state. A corrugated cardboard frame having a pair of end wall sections, a pair of side wall sections having a left wall section positioned to the left of the internal space in the assembled state and extending in the third direction from the top wall section in the unfolded state, and a right wall section positioned to the right of the internal space in the assembled state and extending in the fourth direction from the top wall section in the unfolded state, and extending pieces extending from each of the side wall sections in the first and second directions respectively in the unfolded state and extending along the vertical and horizontal directions in the assembled state, having a envelope shape in the unfolded state and a picture frame box shape in the assembled state, The system comprises a top member installed inside the top wall, an end member installed inside the end wall, and a side member installed inside the side wall, and includes a sound-absorbing member made of a mat-like nonwoven fabric made from pulp and having sound-absorbing properties. Each of the front wall and the rear wall has an outer end wall portion erected outward in the front-rear direction in the assembled state, an inner end wall portion erected inward in the front-rear direction in the assembled state, and a lower end wall portion connecting the lower edges of the outer end wall portion and the inner end wall portion in the assembled state, and the outer end wall portion and the inner end wall portion are spaced apart from each other with a gap corresponding to the front-rear dimension of the lower end wall portion in the assembled state, and the end member is sandwiched between the outer end wall portion and the inner end wall portion. Each of the left and right wall portions has an outer wall portion erected outward in the front-rear direction in the assembled state, an inner wall portion erected inward in the front-rear direction in the assembled state, and a lower wall portion connecting the lower edges of the outer and inner wall portions in the assembled state, and the outer and inner wall portions are spaced apart from each other with a gap corresponding to the left-right dimension of the lower wall portion in the assembled state, and the side member is sandwiched between the outer and inner wall portions. The extension piece comprises a pair of first extension pieces extending in the first direction from the inner wall portion of the left wall portion and the inner wall portion of the right wall portion, respectively, when unfolded, and a pair of second extension pieces extending in the second direction from the inner wall portion of the left wall portion and the inner wall portion of the right wall portion, respectively, when unfolded. Each of the first extension pieces is provided with a first engagement groove for hooking the first extension pieces together in the assembled state, and each of the second extension pieces is provided with a second engagement groove for hooking the second extension pieces together in the assembled state, and is positioned inward in the front-rear direction relative to the end member when assembled. A soundproofing structure characterized by the following features.

[0006] (2) The aforementioned structural portion has an engagement groove cut from below in the assembled state between the extension piece and the inner wall portion, The inner end wall portion has an engagement projection that engages with the engagement groove in the assembled state. The soundproofing structure described in (1), characterized by the above. (3) In the deployed state, the inner flaps extend from the outer wall portion in the first and second directions respectively, and in the assembled state, they extend outward in the front-rear direction relative to the end member along the vertical and left-right directions, and are superimposed on the inner side in the front-rear direction relative to the outer end wall portion. The soundproofing structure according to (1) or (2), characterized by the above. (4) It is equipped with a communication section that connects the internal space and the outside. A soundproofing structure as described in any one of (1) to (3), characterized by the above. [Effects of the Invention]

[0007] According to this case, sound insulation can be improved. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing a soundproofing structure in an embodiment. [Figure 2] This is an exploded view of a soundproofing structure according to an embodiment. [Figure 3] This is an enlarged cross-sectional view of a key part of the embodiment, including the end wall portion of the soundproof structure. [Figure 4] This is an enlarged cross-sectional view of the main part of the embodiment, including the side wall portion of the soundproof structure. [Figure 5] This is a perspective view illustrating the first procedure for assembling the soundproof structure according to the embodiment, and can also be described as a partial unfolded view showing a part of the soundproof structure. [Figure 6] This is a perspective view illustrating the second procedure for assembling the soundproof structure according to the embodiment, and can also be described as a partial unfolded view showing a part of the soundproof structure. [Figure 7] This is a perspective view illustrating the third step in assembling the soundproof structure according to the embodiment. [Modes for carrying out the invention]

[0009] The following describes a soundproofing structure as an embodiment. The soundproofing structure of this embodiment is designed to block noise from noise-generating sources such as vacuum pumps and generators, and is a structure that encloses the internal space in which the noise source is located. This soundproofing structure is used by covering the noise source and is also called a soundproof box or sound-absorbing box. In the embodiments described below, the directions used in the explanation are defined as follows: The horizontal direction is further subdivided into the front-back direction (indicated as "F" for the front and "B" for the rear in the diagram) and the left-right direction (indicated as "L" for the left and "R" for the right in the diagram). Furthermore, within the vertical direction, the direction in which gravity acts is downward (indicated as "D" in the diagram), and the opposite direction to downward is upward (indicated as "U" in the diagram).

[0010] In this embodiment, a sound insulation structure in a posture placed on a surface along the horizontal direction will be described. Hereinafter, the surface on which the sound insulation structure is placed is referred to as the "placement surface". In the sound insulation structure of this embodiment, at least some of the components may be provided symmetrically left and right or front and back, and all or at least some of the components may be provided asymmetrically left and right or front and back.

[0011] [I. One Embodiment] In the following one embodiment, the configuration of the sound insulation structure will be described in detail in item [1], and the assembly procedure of the sound insulation structure will be described in item [2]. And the action and effect by the sound insulation structure will be described in item [3].

[0012] [1. Configuration] As shown in FIG. 1, the sound insulation structure 1 is provided with a cardboard housing part 2 and a sound absorption member 3 installed inside the housing part 2. Note that the sound insulation structure 1 illustrated in this embodiment has only the housing part 2 and the sound absorption member 3, and has a structure that can be assembled without using assembly aids such as glue or clips.

[0013] The housing part 2 is a rigid part that bears the shape maintenance of the sound insulation structure 1 and also bears the sound insulation function. On the other hand, the sound absorption member 3 is a soft part that bears the function of enhancing the sound insulation function. Therefore, it can be said that the sound insulation structure 1 has a structure with a combination of rigidity and flexibility by the housing part 2 and the sound absorption member 3. The housing part 2 and the sound absorption member 3 with different properties in this way have different frequency bands in which the sound insulation is effective by the housing part 2 and the frequency bands in which the sound insulation is effective by the sound absorption member 3.

[0014] If, for example, the housing part 2 has high sound insulation in the mid-low frequency range and the sound absorption member 3 has high sound insulation in the high frequency range, the housing part 2 bears the sound insulation in the mid-low frequency range of the noise, and the housing part 2 bears the sound insulation in the high frequency range of the noise. Generally speaking, among all the frequency bands of the noise, the sound insulation of some bands is achieved by the housing part 2, and the sound insulation of other bands is achieved by the sound absorption member 3. In the following section, regarding the soundproof structure 1 which combines the above-mentioned structural frame 2 and sound-absorbing member 3, the specific configuration of the structural frame 2 will be explained in subsection [1-1], the specific configuration of the sound-absorbing member 3 will be explained in subsection [1-2], and the other configurations will be explained in subsection [1-3].

[0015] [1-1. Body part] The main body 2 is a envelope type when unfolded (hereinafter referred to as "unfolded state") as shown in Figure 2, and a picture frame box type when assembled (hereinafter referred to as "assembled state") as shown in Figure 1. Here, "envelope type" means that in plan view, it has a general shape (so to speak, a box shape) in which sheet pieces extend outwards from the center in all four directions. Also, here, "picture frame box type" means a box shape in which there are multiple wall sections erected along the vertical direction, and horizontal wall sections are provided to connect the vertical edges of these wall sections.

[0016] In the following description, unless otherwise specified, "structural frame 2" refers to the structural frame 2 in an assembled state that forms a three-dimensional shape enclosing the interior space. On the other hand, the unfolded frame section 2 can also be described as the configuration of the blank sheet assembled to the frame section 2, and extends in a planar shape as shown in Figure 2. The unfolded frame section 2 will be described using the following four directions. • First direction: The direction corresponding to the front in the assembled state (indicated as "D1" in the diagram) • Second direction: The direction corresponding to the rear of the assembled state (indicated as "D2" in the diagram) • Third direction: The direction corresponding to the left side in the assembled state (indicated as "D3" in the diagram) • Fourth direction: The direction corresponding to the right side in the assembled state (indicated as "D4" in the diagram)

[0017] As shown in Figure 1, the structural frame 2 is provided with three types of wall sections 2U, 2E, and 2S as described below. • Top wall section 2U: A wall section located above the internal space 20. • End wall section 2E: Wall section located at the front and rear (end) of the internal space 20 • Side wall section 2S: Wall section located on the left and right (sides) of the internal space 20.

[0018] The aforementioned wall sections 2U, 2E, and 2S are rectangular in shape. These wall sections 2U, 2E, and 2S surround the internal space 20 from above and from all four sides (front, back, left, and right, i.e., all directions except below), forming a rectangular cylindrical tray-like structure 2 with an opening at the top that is closed off. Furthermore, the mounting surface of the soundproofing structure 1 extends below the interior space 20. Therefore, the interior space 20 is surrounded on all sides (up, down, front, back, left, and right) by the walls 2U, 2E, 2S and the mounting surface.

[0019] As shown in Figure 2, the top wall section 2U is positioned in the unfolded state of the main body section 2, at the center of the first and second directions, and at the center of the third and fourth directions. As described above, a pair of end wall sections 2E extend in the first and second directions from the top wall section 2U, which is located in the center (so to speak, the middle) of the structural section 2, and a pair of side wall sections 2S extend in the third and fourth directions.

[0020] The end wall portion 2E is provided with a pair of front and rear wall portions 2F and 2B as shown below. • Front wall section 2F: A wall section that extends in the first direction from the top wall section 2U when deployed. • Rear wall section 2B: A wall section that extends in a second direction from the top wall section 2U when deployed. As shown in Figure 1, the front wall section 2F is positioned in front of the internal space 20, and the rear wall section 2B is positioned in rear.

[0021] As shown in Figure 2, the side wall portion 2S is provided with a pair of left and right wall portions, 2L and 2R, as described below. • Left wall section 2L: A wall section that extends in a third direction from the top wall section 2U when deployed. • Right wall section 2R: A wall section extending in the fourth direction from the top wall section 2U when deployed. As shown in Figure 1, the left wall section 2L is located on the left side of the internal space 20, and the right wall section 2R is located on the right side.

[0022] As shown in Figure 3, the front wall section 2F and the rear wall section 2B are each provided with three types of end wall sections 21E, 22E, and 23E as described below. • Outer end wall portion 21E: Wall portion erected on the outer side in the front-rear direction. • Inner end wall portion 22E: A wall portion erected on the inside in the front-rear direction. • Lower end wall section 23E: The wall section connecting the lower edges of the above end wall sections 21E and 22E.

[0023] As shown in Figure 4, side wall sections 21S, 22S, and 23S are provided in the left wall section 2L and the right wall section 2R, respectively. • Outer wall section 21S: A wall section erected on the outside in the left-right direction. • Inner wall section 22S: A wall section erected on the inside in the left-right direction. • Lower wall section 23S: A wall section connecting the lower edges of the above-mentioned side wall sections 21S and 22S.

[0024] In the description of the end walls 21E and 22E, "outside in the front-rear direction" refers to the front side in the front wall 2F and the rear side in the rear wall 2B, and "inside in the front-rear direction" refers to the rear side in the front wall 2F and the front side in the rear wall 2B. In the description of the side walls 21S and 22S, "outside in the left-right direction" refers to the left side in the left wall 2L and the right side in the right wall 2R, and "inside in the left-right direction" refers to the right side in the left wall 2L and the left side in the right wall 2R.

[0025] In other words, the structural frame 2 is provided with a front-to-back double wall structure in which the outer end wall portion 21E and the inner end wall portion 22E are spaced apart with a gap corresponding to the front-to-back dimension of the lower end wall portion 23E, and a left-to-right double wall structure in which the outer wall portion 21S and the inner wall portion 22S are spaced apart with a gap corresponding to the left-to-right dimension of the lower side wall portion 23S. In addition to the walls 2U, 2E, and 2S described above, the structural frame 2, which has a double-wall structure on the front, back, left, and right sides, is also provided with the extension pieces 2P and inner flaps 2I, which will be explained next.

[0026] As shown in Figure 2, the extension pieces 2P extend from each side wall portion 2S in the first and second directions, respectively, when unfolded. Specifically, four extension pieces 2P, listed below, extend from the side wall portions 2S of the left wall portion 2L and the right wall portion 2R. • Left front extension piece 21P: An extension piece 2P extending in the first direction from the inner wall portion 22S of the left wall portion 2L. • Left rear extension piece 22P: An extension piece 2P extending in a second direction from the inner wall portion 22S of the left wall portion 2L. • Right front extension piece 23P: An extension piece 2P extending in the first direction from the inner wall portion 22S of the right wall portion 2R. • Right rear extension piece 24P: An extension piece 2P extending in a second direction from the inner wall portion 22S of the right wall portion 2R.

[0027] As shown in Figure 6, the four extension pieces 2P described above are bent relative to the inner wall portion 22S in the structural body portion 2 and extend inward to the outer end wall portion 21E. More specifically, the extension pieces 21P, 22P, 23P, and 24P extend inward in the front-rear direction relative to the outer end wall portion 21E, spaced apart from the outer end wall portion 21E for the placement of the sound-absorbing member 3 (see Figure 6), and extend along the vertical and horizontal directions. As shown in Figure 3, the extension piece 2P in this example is superimposed on the inner end wall portion 22E in the front-rear direction outward.

[0028] The left-right dimensions of each extension piece 21P, 22P, 23P, and 24P are set to be longer than half the left-right dimension of the outer end wall portion 21E (end wall portion 2E) and shorter than the left-right dimension of the outer end wall portion 21E. In other words, the dimensions of the extension pieces 21P, 22P, 23P, and 24P, which are bent relative to the side wall portion 2S, are designed so that a portion of the tip ends of the left front extension piece 21P and the right front extension piece 23P overlap, and a portion of the tip ends of the left rear extension piece 22P and the right rear extension piece 24P overlap.

[0029] When the extension pieces 21P, 22P, 23P, and 24P are grouped by their extension direction, they can be classified into a pair of first extension pieces 2X consisting of a left front extension piece 21P and a right front extension piece 23P extending in the first direction, and a pair of second extension pieces 2Y consisting of a left rear extension piece 22P and a right rear extension piece 24P extending in the second direction.

[0030] Each of the first extension pieces 2X is provided with a first engagement groove 21G for hooking the first extension pieces 2X together. The first engagement groove 21G is a groove cut into a portion of the overlapping tip side of a pair of first extension pieces 2X. Similarly, each of the second extension pieces 2Y is provided with a second engagement groove 22G for hooking the second extension pieces 2Y together. The second engagement groove 22G is a groove cut into a portion of the overlapping tip side of a pair of second extension pieces 2Y.

[0031] The engagement grooves 21G and 22G illustrated in Figures 5 and 6 are cut into the extension pieces 2X and 2Y at positions corresponding to the left-right center of the outer end wall portion 21E (end wall portion 2E). More specifically, the left front extension piece 21P (one of the first extension piece 2X) and the right rear extension piece 24P (one of the second extension piece 2Y) have engagement grooves 21G and 22G cut from top to bottom (from bottom to top in the assembly in progress shown in Figures 5 and 6). Also, the right front extension piece 23P (the other of the first extension piece 2X) and the left rear extension piece 22P (the other of the first extension piece 2X) have engagement grooves 21G and 22G cut from bottom to top (from top to bottom in the assembly in progress shown in Figures 5 and 6).

[0032] As shown in Figure 2, the inner flap 2I extends from the outer wall portion 21S in the first and second directions, respectively, when deployed. This inner flap 2I is folded relative to the outer wall portion 21S and, as shown in Figure 3, is superimposed on the inner side in the front-rear direction relative to the outer end wall portion 21E and on the outer side in the front-rear direction relative to the sound-absorbing member 3, extending along the vertical and horizontal directions.

[0033] In addition, as shown in Figure 7, the structural body 2 exemplified here is provided with an engagement groove 2G cut from below between the extension pieces 2X, 2Y and the inner wall portion 22S. Furthermore, the inner end wall portion 22E is provided with an engagement projection 29E that engages with the engagement groove 2G. As shown in Figure 2, the engagement groove 2G is formed by a slit 2G' provided between the extended pieces 2X, 2Y and the side wall portion 2S in the unfolded state. A folding crease line 20L is connected to the slit 2G'. Specifically, between the extended pieces 2X, 2Y and the side wall portion 2S, the slit 2G' is cut in a hook shape on the inner side in the left-right direction of Figure 2 (inner side in the third and fourth directions), and the folding crease line 20L is connected to the slit 2G' on the outer side in the left-right direction of Figure 2 (outer side in the third and fourth directions).

[0034] When the extended pieces 2X and 2Y in their unfolded state are folded along the fold lines 20L relative to the side wall portion 2S, the slit 2G' is cut in a hook shape, and thus an engagement groove 2G is formed at the location corresponding to the slit 2G'. The engaging projection 29E is a portion of the inner end wall 22E that protrudes to the left and right on the vertically outward side in Figure 2 when deployed. As shown in Figure 7, this engaging projection 29E is a portion of the inner end wall 22E that protrudes from the lower side in the left-right direction and is provided in accordance with the range over which the engaging groove 2G extends in the vertical direction.

[0035] [1-2. Sound-absorbing materials] As shown in Figure 1, the sound-absorbing member 3 is installed inside the frame 2 and has a sound-absorbing function. This sound-absorbing member 3 is made of a mat-shaped nonwoven fabric made from pulp. For example, a known material produced by the TDS (Total Dry System) process (so-called TDS material) can be used for the sound-absorbing member 3. In this embodiment, the focus is on the sound-absorbing function of the sound-absorbing member 3, but the sound-absorbing member 3 may also have other functions such as heat retention, cold retention, buffering, and ventilation.

[0036] The sound-absorbing member 3 is provided with the following five members, corresponding to the five wall sections 2U, 2F, 2B, 2L, and 2R of the structural frame 2. • Top component 3U: Sound-absorbing component 3 installed inside the top wall section 2U • Front member 3F: Sound-absorbing member 3 installed inside the front wall section 2F • Rear member 3B: Sound-absorbing member 3 installed inside the rear wall 2B • Left component 3L: Sound-absorbing component 3 installed inside the left wall section 2L • Right component 3R: Sound-absorbing component 3 installed inside the right wall section 2R

[0037] The front member 3F and the rear member 3B can be rephrased as a pair of front and rear end members 3E that are housed within the end wall portion 2E. Similarly, the left member 3L and the right member 3R can be rephrased as a pair of front and rear side members 3S that are housed within the side wall portion 2S. As shown in Figure 1, the top member 3U is positioned so as to overlap the bottom side of the top wall 2U.

[0038] As shown in Figure 3, the end member 3E is sandwiched between the outer end wall 21E and the inner end wall 22E in the end wall 2E. An extension piece 2P is positioned on the inner side in the front-rear direction of this end member 3E, and an inner flap 2I is positioned on the outer side in the front-rear direction. For example, the front member 3F (one of the end members 3E) is positioned behind the outer end wall 21E and in front of the inner end wall 22E in the front wall 2F, and is positioned in front of the extension piece 2P and behind the inner flap 2I. As shown in Figure 4, the side member 3S is sandwiched between the outer wall portion 21S and the inner wall portion 22S.

[0039] [1-3. Others] In addition, the soundproofing structure 1 illustrated in this embodiment is provided with a communication section 4 that connects the internal space 20 to the outside, as shown in Figures 1 and 7. As examples of the communication section 4, Figures 1 and 7 show a through hole 4H (only one is reference numerald in Figures 1 and 7) and a notched groove 4G. It is preferable that the connecting portions 4, such as through holes 4H and notched grooves 4G, are provided in advance in both the structural body 2 and the sound-absorbing member 3.

[0040] However, the connecting parts 4, such as through holes 4H and notched grooves 4G, do not necessarily have to be provided in the sound-absorbing member 3 beforehand, as shown in Figures 6 and 7. In this case, after the soundproofing structure 1 is assembled, the through holes 4H that penetrate the sound-absorbing member 3 can be drilled, or the notched grooves 4G that are cut out of the sound-absorbing member 3 can be formed. Alternatively, if a sound-absorbing member 3 with ventilation function is used, a communication section 4 may be provided in which at least a part of the through hole 4H or notched groove 4G is closed with the sound-absorbing member 3, provided that a communication section 4 is provided in which at least a part of the through hole 4H or notched groove 4G is closed with the sound-absorbing member 3, or the communication section 4 may be provided only in the structural body 2.

[0041] [2. Assembly procedure for soundproof structure] Next, the assembly procedure for soundproof structure 1 will be explained. Here, we will illustrate the procedure for assembling soundproof structure 1 by carrying out steps X10 to X50 in order. First, as shown in Figure 2, a procedure X10 is performed in which the top member 3U (see Figure 5) is superimposed on the top wall portion 2U of the soundproof structure 1 in the unfolded state, in a direction corresponding to the downward direction in the assembled state.

[0042] Then, as shown in Figure 5, a procedure X20 is performed to fold and form the side wall portion 2S. In procedure X20, a procedure X22 is performed to fold the outer wall portion 21S up relative to the top wall portion 2U, a procedure X24 is performed to fold down the lower side wall portion 23S relative to the outer wall portion 21S, and a procedure X26 is performed to fold down the inner wall portion 22S relative to the lower side wall portion 23S. Next, as shown in Figure 6, the procedure X30 of bending and hooking the extension piece 2P is performed, followed by the procedure X40 of positioning the sound-absorbing member 3.

[0043] In step X30, step X32 is performed to fold down the extension piece 2P relative to the inner wall portion 22S, and step X34 is performed to hook the folded extension pieces 2P together using the hooking grooves 21G and 22G. In step X40, step X42 is performed to insert a side member 3S between the outer wall portion 21S and the inner wall portion 22S, step X44 is performed to position an end member 3E on the front-rear outer side of the extension piece 2P, and step X46 is performed to fold down the inner flap 2I.

[0044] Note that the order in which step X44 and step X46 are performed is not limited to step X44 followed by step X46; step X44 may be performed after step X46. In step X44 performed after step X46, the end member 3E is inserted between the inner flap 2I and the extension piece 2P. In step X46 performed after step X44, the inner flap 2I is folded down and overlapped with the end member 3E on the front-rear outward side.

[0045] Then, procedure X50 is carried out to complete soundproofing structure 1. In step X50, as shown in Figure 7, step X52 is performed to fold the outer end wall portion 21E relative to the top wall portion 2U, step X54 is performed to fold down the lower end wall portion 23E relative to the outer end wall portion 21E, and step X56 is performed to fold down the inner end wall portion 22E relative to the lower end wall portion 23E. Finally, step X58 is performed to engage the engaging projection 29E of the inner end wall portion 22E with the engaging groove 2G. Through these steps X52, X54, X56, and X58, the end wall portion 2E is formed by bending.

[0046] Figure 7 illustrates a soundproofing structure 1 in which the upside down is reversed compared to the orientation during use. The soundproofing structure 1 illustrated in Figure 7 is used by inverting it and placing it over the noise source. Furthermore, if auxiliary wires such as power cords or hoses are connected to the noise source, the auxiliary wires are passed through the connecting section 4 before the soundproofing structure 1 is used.

[0047] [3. Action and Effects] Because the soundproofing structure 1 of this embodiment has the above-described configuration, the following functions and effects can be obtained. (1) The soundproof structure 1 is provided with a frame 2 and sound-absorbing members 3 that surround the internal space 20 where the noise source placed on the mounting surface is located, not only from the front, back, left, and right (so to speak, all four sides), but also from above. Therefore, the soundproof structure 1 and the mounting surface surround the noise source in all directions: above, below, front, back, left, and right. Thus, the soundproofing of the noise source can be enhanced.

[0048] This soundproof structure 1 can be assembled simply by installing sound-absorbing material 3 inside a frame-shaped structural body 2. Specifically, as described above in steps X10 to X50, by incorporating sound-absorbing material 3 during the assembly of the structural body 2, the soundproof structure 1 can be assembled without using glue, clips, or other fasteners. Therefore, the ease of assembly of the soundproof structure 1 can also be improved. In addition, the soundproof structure 1 comprises a cardboard frame 2 and a sound-absorbing material 3 made from pulp. The soundproof structure 1, which consists only of this frame 2 and sound-absorbing material 3, can be recycled through waste paper collection and can also be disposed of as combustible waste.

[0049] (2) In the soundproofing structure 1 illustrated in this embodiment, an engagement groove 2G is provided between the extension pieces 2X, 2Y and the inner wall portion 22S, and an engagement projection 29E that engages with this engagement groove 2G is provided on the inner end wall portion 22E. Therefore, after the above-described procedure X56, by performing the procedure X58 in which the engagement projection 29E of the inner end wall portion 22E is engaged with the engagement groove 2G, the position of the inner end wall portion 22E that was folded down in the procedure X58 is maintained, and displacement of the inner end wall portion 22E can be suppressed.

[0050] (3) Furthermore, an inner flap 2I extends from the outer wall portion 21S to the frame portion 2 of the soundproof structure 1. This inner flap 2I improves the ease of inserting the side member 3S. Specifically, in the procedure X42 described above, the inner flap 2I can be used as a guide for inserting the side member 3S between the outer wall portion 21S and the inner wall portion 22S. For example, by inserting the side member 3S while sliding it against the left-right outer side of the side member 3S on the left-right inner side of the inner flap 2I, the ease of inserting the side member 3S can be improved.

[0051] (4) In addition, the soundproof structure 1 is provided with a communication section 4 that connects the internal space 20 to the outside. Therefore, even if auxiliary wires such as power cords and hoses are connected to the noise source, the noise source can be enclosed by the soundproof structure 1 with the auxiliary wires passed through the communication section 4. Thus, when the noise source is operated by power supplied from the power cord or compressed air supplied from the hose, the noise generated from the noise source can be reduced (soundproofed) by the soundproof structure 1.

[0052] [II. Variant Examples] The embodiments described above are merely illustrative, and there is no intention to exclude various modifications or applications of techniques not explicitly stated in these embodiments. Each configuration of these embodiments can be modified in various ways without departing from their spirit. Furthermore, they can be selected and combined as needed. For example, the extension piece is not limited to being arranged to overlap the inner end wall portion on the outside in the front-rear direction as described above in one embodiment, but may also be arranged to overlap the inner end wall portion on the inside in the front-rear direction. Furthermore, in one embodiment, the engagement groove and engagement projection may be omitted from the soundproofing structure described above, and the inner flap and communication part may also be omitted. In this case, the soundproofing structure can be simplified. [Explanation of Symbols]

[0053] 1. Soundproofing structure 2 Body part 20 Interior space 20L Fold-out ruled lines 21E Outer end wall 21G First hooking groove 21P Left front extension piece (first extension piece) 21S outer wall 22E Inner end wall 22G Second hooking groove 22P Left rear extension piece (second extension piece) 22S inner wall 23E Lower end wall 23P Right front extension piece (first extension piece) 23S Lower wall 24P Left rear extension film output (second extension film output) 29E series protrusion 2B Rear Wall 2E end wall 2F front wall 2G series ditch 2G′ スリット 2I inner フラップ 2L Left wall 2P extended film 2R Right wall 2S side wall portion 2U Skywall 2X First Delay Output 2Y Second Delay Film Release 3 Sound-absorbing materials 3B rear section 3E end material 3F front material 3L left part 3R right part material 3S side material 3U Tenbu Material 4. Connecting parts 4G Cutting Edge 4H through hole

Claims

1. A soundproof structure that surrounds the internal space where the noise source is located, The assembly includes a top wall portion positioned above the internal space in the assembled state and, in the unfolded state, positioned in the center of the first direction corresponding to the front of the assembled state and the second direction corresponding to the rear of the assembled state, as well as in the center of the third direction corresponding to the left of the assembled state and the fourth direction corresponding to the right of the assembled state; a front wall portion positioned in front of the internal space in the assembled state and extending from the top wall portion in the first direction in the unfolded state; and a rear wall portion positioned behind the internal space in the assembled state and extending from the top wall portion in the second direction in the unfolded state. A corrugated cardboard frame having a pair of end wall sections, a pair of side wall sections having a left wall section positioned to the left of the internal space in the assembled state and extending in the third direction from the top wall section in the unfolded state, and a right wall section positioned to the right of the internal space in the assembled state and extending in the fourth direction from the top wall section in the unfolded state, and extending pieces extending from each of the side wall sections in the first and second directions respectively in the unfolded state and extending along the vertical and horizontal directions in the assembled state, having a envelope shape in the unfolded state and a picture frame box shape in the assembled state, The system comprises a top member installed inside the top wall, an end member installed inside the end wall, and a side member installed inside the side wall, and includes a sound-absorbing member made of a mat-like nonwoven fabric made from pulp and having sound-absorbing properties. Each of the front wall and the rear wall has an outer end wall portion erected outward in the front-rear direction in the assembled state, an inner end wall portion erected inward in the front-rear direction in the assembled state, and a lower end wall portion connecting the lower edges of the outer end wall portion and the inner end wall portion in the assembled state, and the outer end wall portion and the inner end wall portion are spaced apart from each other with a gap corresponding to the front-rear dimension of the lower end wall portion in the assembled state, and the end member is sandwiched between the outer end wall portion and the inner end wall portion. Each of the left and right wall portions has an outer wall portion erected outward in the front-rear direction in the assembled state, an inner wall portion erected inward in the front-rear direction in the assembled state, and a lower wall portion connecting the lower edges of the outer and inner wall portions in the assembled state, and the outer and inner wall portions are spaced apart from each other with a gap corresponding to the left-right dimension of the lower wall portion in the assembled state, and the side member is sandwiched between the outer and inner wall portions. The extension piece comprises a pair of first extension pieces extending in the first direction from the inner wall portion of the left wall portion and the inner wall portion of the right wall portion, respectively, when unfolded, and a pair of second extension pieces extending in the second direction from the inner wall portion of the left wall portion and the inner wall portion of the right wall portion, respectively, when unfolded. Each of the first extension pieces is provided with a first engagement groove for hooking the first extension pieces together in the assembled state, and each of the second extension pieces is provided with a second engagement groove for hooking the second extension pieces together in the assembled state, and is positioned inward in the front-rear direction relative to the end member when assembled. A soundproofing structure characterized by the following features.

2. The aforementioned structural portion has an engagement groove cut from below in the assembled state between the extension piece and the inner wall portion, The inner end wall portion has an engagement projection that engages with the engagement groove in the assembled state. The soundproofing structure according to feature 1.

3. In the deployed state, the inner flaps extend from the outer wall portion in the first and second directions respectively, and in the assembled state, they extend outward in the front-rear direction relative to the end member along the vertical and left-right directions, and are superimposed on the inner side in the front-rear direction relative to the outer end wall portion. The soundproofing structure according to feature 1 or 2.

4. It is equipped with a communication section that connects the internal space and the outside. The soundproofing structure according to feature 1.

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