Sound insulation wall unit, sound insulation wall structure, and construction method of sound insulation wall unit

Abstract

To provide a sound insulation wall unit capable of constructing a ground cover and a sound insulation wall with a simple constitution without using an anchor bolt.SOLUTION: A precast concrete sound insulation wall unit 1 arranged along a moving direction of a noise source includes: a first panel 10 erected on a near side of the noise source; a second panel 20 erected higher than the first panel 10 on a far side of the noise source; and a connecting member 30 provided so that, along a direction crossing the moving direction, a space for filling concrete is formed between the opposed first panel 10 and second panel 20.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to a sound insulation wall unit, a sound insulation wall structure, and a method for constructing a sound insulation wall unit. [Background technology]

[0002] Conventionally, soundproofing walls have been installed along roads or railroad tracks to prevent the sound of cars traveling on the road or trains traveling on the tracks from being transmitted to the surrounding area. Soundproofing walls include those that are composed of support posts erected at regular intervals and multiple soundproofing panels attached to the support posts, as well as other types with improved soundproofing capabilities. In particular, in urban areas and densely populated residential areas, various methods have been adopted to improve soundproofing capabilities in order to prevent the sound of trains from being transmitted to the surrounding area.

[0003] For example, Patent Document 1 discloses a sound insulation wall constructed by erecting H-shaped steel columns at predetermined intervals on the top surface of a foundation and stacking multiple sound insulation panels vertically between the columns. The sound insulation panels include a front panel, a rear panel, and sound-absorbing material housed between the front panel and the rear panel. The inclusion of the sound-absorbing material allows the sound insulation wall as a whole to exhibit sound-absorbing performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-22549 Summary of the Invention [Problem to be solved by the invention]

[0005] In the sound insulating wall described in Patent Document 1, the support columns are fixed to the foundation together with the base plate by placing a base plate welded to the lower end of the support columns on the top surface of the foundation and embedding anchor bolts that pass through the base plate into the foundation. This imposes a constraint that the base plate must be installed accurately relative to the anchor bolts. Furthermore, the process of embedding the anchor bolts in the foundation at accurate positions is itself a time-consuming task.

[0006] Therefore, the present invention aims to provide a sound insulation wall unit, a sound insulation wall structure, and a construction method for a sound insulation wall unit that allows for the construction of ground cover and sound insulation walls with a simple configuration without using anchor bolts. [Means for solving the problem]

[0007] In response to the above-mentioned problems, the sound-insulating wall unit of the present invention is a sound-insulating wall unit made of precast concrete and arranged along the direction of movement of a noise source, and is characterized by comprising: a first panel erected on the side closer to the noise source; a second panel erected higher than the first panel on the side farther from the noise source; and a connecting member arranged along a direction intersecting the direction of movement so as to form a space for filling concrete between the opposing first and second panels.

[0008] Here, it is preferable that the first panel has a through hole formed therethrough in the thickness direction, the second panel has an insertion hole formed therethrough that opens toward the first panel, and the connecting member has a rod-shaped body one end of which is inserted into the through hole and the other end of which is inserted into the insertion hole, and a fixing member that fixes the rod-shaped body inserted into the through hole to the first panel. Also, it is preferable that the connecting member be formed of a plate-shaped member that joins the opposing surfaces of the first panel and the second panel.

[0009] In addition, the first panel may have a first engagement recess formed on the second panel side, and the second panel may have a second engagement recess formed on the first panel side, and the connecting member may be configured to have a rod-shaped body extending between the first panel and the second panel, a first engagement portion provided on one end of the rod-shaped body and engaging with the first engagement recess, and a second engagement portion provided on the other end of the rod-shaped body and engaging with the second engagement recess.

[0010] It is also desirable that the plate-like member has an opening formed therethrough in the plate thickness direction.It is also desirable that a concrete deposit portion is formed on at least one of the opposing surfaces of the first panel and the second panel.Furthermore, it is desirable that the thickness of the upper end of the second panel is thinner than the thickness of the lower end.

[0011] The invention also provides a sound insulating wall structure in which a plurality of the sound insulating wall units described above are arranged in parallel along the movement direction, and the space formed between the opposing first and second panels is filled with concrete with reinforcing bars arranged therein. Here, it is desirable that the sound insulating wall structure be such that first engaging members are provided at both widthwise ends of the first panel for engaging with adjacent first panels, and that second engaging members are provided at both widthwise ends of the second panel for engaging with adjacent second panels.

[0012] The invention also relates to a method for constructing sound-insulating wall units, which includes the steps of arranging a plurality of sound-insulating wall units described above in parallel on a concrete floor slab, and filling concrete into the space formed between the first panel and the second panel. [Effects of the Invention]

[0013] In this way, the sound insulation wall unit of the present invention is arranged so that a space for filling with concrete is formed between the opposing first and second panels along a direction intersecting the direction of movement of the noise source. Therefore, by simply filling concrete between a pair of panels that function as wall surfaces, a sound insulation wall unit that functions as both a ground protection wall and a sound insulation wall can be formed, without the need for a strict positioning process using anchor bolts. This makes it possible to achieve both the functions of a ground protection wall and a sound insulation wall with a single structure called the sound insulation wall unit.

[0014] In particular, the connecting member connecting the first and second panels is configured with a rod-shaped body whose both ends are inserted into a through-hole formed in the first panel and an insertion hole formed in the second panel. This eliminates the need for nut tightening or spacing work on one panel. Therefore, the panels can be connected with a simple structure.

[0015] The connecting member may be configured to include a rod-shaped body extending between the first and second panels, a first engaging portion provided on one end of the rod-shaped body and engaging with the first engaging recess, and a second engaging portion provided on the other end of the rod-shaped body and engaging with the second engaging recess. This eliminates the need for nut tightening or spacing work on either panel side. Therefore, the panels can be connected with a simple configuration.

[0016] The connecting member may be a plate-like member that connects the opposing surfaces of the first and second panels. This increases the rigidity of the sound-insulating wall unit. Furthermore, if the plate-like member has an opening that penetrates through the plate thickness, it becomes possible to arrange reinforcement through the opening.

[0017] Here, if a concrete adhesion portion is formed on at least one of the opposing surfaces of the first and second panels, the adhesion between the first and second panels and the concrete can be improved. Also, by making the thickness of the upper end of the second panel thinner than the thickness of the lower end, it is possible to suppress an increase in weight even if the height of the second panel is increased.

[0018] In a sound insulation wall structure in which multiple sound insulation wall units are arranged in parallel along the direction of movement, the space formed between the opposing first and second panels is filled with concrete with reinforcing bars arranged inside. This increases the rigidity of the lower part of the sound insulation wall structure. Furthermore, if the reinforcing bars are erected from the deck slab, the deck slab and the sound insulation wall units can be firmly integrated.

[0019] Furthermore, both widthwise ends of the first panel may be provided with first engaging members that engage with other adjacent first panels, and both widthwise ends of the second panel may be provided with second engaging members that engage with other adjacent second panels. This increases the adhesion between adjacent panels and prevents concrete filled in spaces from leaking out of the sound insulating wall unit.

[0020] Furthermore, the method for constructing sound insulation wall units of the present invention includes the steps of arranging multiple sound insulation wall units in parallel on a concrete floor slab and filling the space formed between the first and second panels with concrete. This eliminates the need for precise positioning using anchor bolts, and enables the construction of ground guards and sound insulation walls in fewer steps. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a plan view showing an example of installation of a sound insulating wall unit according to a first embodiment. [Figure 2A] FIG. 2 is an exploded perspective view of the sound insulating wall unit according to the first embodiment. [Figure 2B] FIG. 1 is a side view of a sound insulating wall unit according to a first embodiment. [Figure 3] 1(a) is a perspective view of the first panel as seen from the front side, FIG. 1(b) is a perspective view of the first panel as seen from the rear side, and FIG. 1(c) is a plan view of the first panel. [Figure 4] 1(a) is a perspective view of the second panel as seen from the front side, and FIG. 1(b) is a side view of the second panel. [Figure 5](a) is a schematic diagram showing an example of a concrete adhesion portion, (b) is a schematic diagram showing another example of a concrete adhesion portion, and (c) is a schematic diagram showing yet another example of a concrete adhesion portion. [Figure 6A] FIG. 10 is an exploded perspective view of a sound insulating wall unit according to a first modified example. [Figure 6B] FIG. 10 is a side view of a sound insulating wall unit according to a first modified example. [Figure 6C] FIG. 10 is a side view of a sound insulating wall unit according to a second modified example. [Figure 7] FIG. 10(a) is a schematic diagram showing an example of temporarily fixing the second panel, and FIG. 10(b) is a schematic diagram showing another example of temporarily fixing the second panel. [Figure 8] FIG. 10 is a diagram showing a state in which sound insulating wall units are engaged with each other. [Figure 9] FIG. 2 is a schematic cross-sectional view showing a state in which the sound-insulating wall unit is filled with concrete. [Figure 10] FIG. 10 is a schematic plan view showing a state in which the sound-insulating wall unit is filled with concrete. [Figure 11] FIG. 1 is an explanatory diagram showing the state in which roadbed concrete and railroad tracks are laid on the deck slab. [Figure 12] FIG. 10 is a perspective view of a sound insulating wall unit according to a second embodiment. [Figure 13] FIG. 10 is a perspective view of a sound insulating wall unit according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] (First embodiment) A sound insulating wall unit according to a first embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a plan view showing an example of installation of a sound insulating wall unit 1, and Fig. 2 is a perspective view of the sound insulating wall unit 1.

[0023] 1, a plurality of sound insulating wall units 1 are arranged consecutively, for example, along the direction in which the track 102 extends. Specifically, the sound insulating wall units 1 are installed on a deck (concrete deck) 101 that constitutes the floor of the viaduct, and are arranged in parallel with no gaps next to the roadbed concrete 52 and the track 102 along the direction in which the track 102 extends.

[0024] The sound insulating wall units 1 are installed without gaps along the direction of movement of the train 103, which is the noise source, in order to prevent noise such as the running sound of the train 103 or the horn from diffusing around the tracks. The sound insulating wall units 1 have a height similar to that of the train 103 carriages, for example.

[0025] 2A and 2B, the sound-insulating wall unit 1 is composed of two plate-shaped panels of different heights made of precast concrete. The sound-insulating wall unit 1 is composed of a first panel 10 erected on the side closer to the noise source (train 103), a second panel 20 erected higher than the first panel 10 on the side farther from the noise source, and a connecting member 30 provided so as to form a space between the opposing first panel 10 and second panel 20 into which concrete can be filled. The connecting member 30 connects the first panel 10 and the second panel 20 together.

[0026] The first panel 10 and the second panel 20 are arranged facing each other at a distance in a direction intersecting (orthogonal to) the direction in which the noise source moves. The heights of the first panel 10 and the second panel 20 and the distance between the first panel 10 and the second panel 20 may be changed as appropriate depending on the location where the sound insulating wall unit 1 is installed.

[0027] The first panel 10 has four through holes 13 formed therethrough in the thickness direction. The second panel 20 has insertion holes 23 formed at positions that coincide with the through holes 13 in the direction facing the first panel 10 (horizontal direction). That is, the through holes 13 and the insertion holes 23 are formed at positions that coincide with the positions in the direction in which the first panel 10 and the second panel 20 face each other in the sound insulating wall unit 1 (facing direction). The numbers of through holes 13 and insertion holes 23 are not particularly limited.

[0028] The connecting member 30 has a rod-shaped body 31 and a nut (fixing member) 32. One end of the rod-shaped body 31 is inserted into the through-hole 13, and the other end is inserted into the insertion hole 23. The nut 32 fixes the rod-shaped body 31 inserted into the through-hole 13 to the first panel 10 while being inserted into the through-hole 13. In order to prevent the formwork from bulging due to lateral pressure when pouring concrete (the movement of the first panel 10 away from the second panel 20 due to the force that pushes the gap between the first panel 10 and the second panel 20 apart as unhardened concrete tries to flow out), it is sufficient to attach the nuts 32 only to the outside of the first panel 10. However, in order to prevent the first panel 10 from shifting out of position, it is also possible to attach nuts 32 to a deep part of the thread on the first panel side of the rod-shaped body 31 (a position far from the end of the rod-shaped body 31 on the thread of the first panel) so that the nuts 32 can be tightened from the second panel side of the through-hole 13 of the first panel 10 as well. Then, the rod-shaped body 31 is inserted into the second panel 20, and the first panel 10 and the nuts 32 on the outside of the first panel 10 are inserted into the rod-shaped body 31 in that order. The first panel 10 is then tightened from both sides while adjusting the positions of the nuts 32 on both sides, thereby positioning the first panel 10 in the desired position. Furthermore, instead of the nuts 32, the rod-shaped body 31 may be fixed to the first panel 10 by means of peakons.

[0029] Fig. 3(a) is a perspective view of the first panel 10 seen from the front side, Fig. 3(b) is a perspective view of the first panel 10 seen from the back side, and Fig. 3(c) is a plan view of the first panel 10. Fig. 4(a) is a perspective view of the second panel 20 seen from the front side, and Fig. 4(b) is a side view of the second panel 20.

[0030] As shown in Figure 3(a), the first panel 10 is configured to have a main body portion 11 and first engagement members 12 provided on both end sides of the main body portion 11. That is, both end portions of the first panel 10 in the width direction are provided with first engagement members 12 that engage with other adjacent first panels 10.

[0031] The main body 11 is a flat plate-like member formed in a rectangular shape when viewed from the front, and has through holes 13 formed therethrough in the thickness direction. The through holes 13 are formed, for example, at two locations in the vertical direction and two locations in the horizontal direction. The four through holes 13 are formed at positions point-symmetrical with respect to the center of the main body 11.

[0032] 3(b), the surface of the main body 11 facing the second panel 20 forms a first opposing surface 11a. A concrete adhering portion 40 is formed on the first opposing surface 11a. The area where the concrete adhering portion 40 is formed is not particularly limited, but in order to improve adhesion with the concrete filled between the first panel 10 and the second panel 20 as described below, it is desirable that the concrete adhering portion 40 be formed over almost the entire surface of the first opposing surface 11a.

[0033] 3(c), the first engagement members 12 are a pair of left and right protruding pieces that protrude widthwise from the main body portion 11, and the first engagement members 12 are provided at positions in the width direction of the first panel 10 so as not to overlap each other in a plan view. The first engagement members 12 have a thickness thinner than the main body portion 11, and are formed so that the total thickness of the pair of first engagement members 12 matches the thickness of the main body portion 11.

[0034] The first engagement members 12 engage with the first engagement members 12 of other adjacent first panels 10, thereby engaging the first panels 10 together along the width direction and forming a continuous state. When the first engagement members 12 engage with each other, the thickness of the overlapping first engagement members 12 at the engaged points matches the thickness of the main body 11.

[0035] As shown in Figures 4(a) and 4(b), the second panel 20 is configured to be taller than the first panel 10 in the up-down direction and to have approximately the same width as the first panel 10. The second panel 20 is configured to have a main body 21 and second engagement members 22 provided on both end sides of the main body 21. In other words, the second panel 20 is provided at both widthwise end portions with second engagement members 22 that engage with other adjacent second panels 20.

[0036] The main body 21 is a flat member formed in a rectangular shape when viewed from the front, and has insertion holes 23 (non-through holes) formed on the lower side that open toward the first panel 10. For example, two insertion holes 23 are formed in each of the vertical and horizontal directions, and each insertion hole 23 is formed at a position that coincides with the corresponding through hole 13 in the thickness direction of the second panel 20. Note that the main body 21 may have through holes formed instead of the insertion holes 23.

[0037] The surface of the main body 21 facing the first panel 10 forms a second opposing surface 21a. A concrete adhesion portion 40 is formed below the second opposing surface 21a at a location that coincides with the main body 11 in the height direction.

[0038] The second engaging members 22 are provided for the same purpose as the first engaging members 12. Specifically, the second engaging members 22 are a pair of protruding pieces that protrude in the width direction from the main body portion 21, and the second engaging members 22 are provided at positions in the width direction of the second panel 20 where they do not overlap with each other in a plan view. The second engaging members 22 have a thickness thinner than the main body portion 21, and are formed so that the total thickness of the pair of second engaging members 22 matches the thickness of the main body portion 21.

[0039] The thickness of the upper end of the second panel 20 can be formed to be thinner than the thickness of the lower end. The second panel 20 may be formed to become thinner from the lower end to the upper end, or may be formed to have a uniform thickness up to the middle of its height and then gradually become thinner from there.

[0040] As described above, at least one of the first opposing surface 11a and the second opposing surface 21a has a concrete adhering portion 40 for adhering concrete. Figures 5(a) to 5(c) are schematic diagrams showing an example of the concrete adhering portion 40. As shown in Figures 5(a) to 5(c), the concrete adhering portion 40 has an uneven structure.

[0041] FIG. 5(a) is a schematic diagram showing an example of a concrete adhesion portion 40. The concrete adhesion portion 41 is an example in which a plurality of protrusions D are provided on a flat surface, resulting in a relatively uneven shape. Specifically, as shown in FIG. 5(a), the plurality of protrusions D are arranged in a grid pattern, so that the concrete adhesion portion 41 forms a regular uneven pattern. Note that the shape, arrangement position, size, etc. of each protrusion D are not particularly limited.

[0042] FIG. 5(b) is a schematic diagram showing another example of the concrete adhesion portion 40. The concrete adhesion portion 42 is an example in which a plurality of recesses E are provided on a flat surface, resulting in a relatively uneven shape. Specifically, as shown in FIG. 5(b), the plurality of recesses E are arranged in a grid pattern, so that the concrete adhesion portion 42 forms a regular uneven pattern. Note that the shape, position, size, etc. of each recess E are not particularly limited.

[0043] Fig. 5(c) is a schematic diagram showing yet another example of the concrete adhesion portion 40. The concrete adhesion portion 43 is an example in which a plurality of attachments F are embedded in a flat surface, resulting in an uneven shape. Specifically, as shown in Fig. 5(c), a plurality of attachments F having various shapes and dimensions are arranged, resulting in the concrete adhesion portion 43 having an irregular uneven shape.

[0044] In this way, by forming the concrete adhesion portion 40 on at least one of the first opposing surface 11a and the second opposing surface 21a, the contact area with the concrete filled in the gap formed between the first panel 10 and the second panel 20 is increased, and it is possible to further improve the adhesion between the first panel 10 and the concrete and between the second panel 20 and the concrete. Note that when the concrete adhesion portion 40 is formed on both the first panel 10 and the second panel 20, the respective concrete adhesion portions 40 may be of the same type or different types.

[0045] The concrete adhesion portion 40 is not limited to a structure having an uneven shape, but may be formed by any means that promotes adhesion to concrete, including roughening treatment using a disk sander or water jet, coating treatment with fine particles, chemical surface treatment, etc.

[0046] Fig. 6A is an exploded perspective view of a sound insulating wall unit 1A according to a first modified example, and Fig. 6B is a side view of the sound insulating wall unit 1A according to the first modified example. As shown in Figs. 6A and 6B, the sound insulating wall unit 1A is configured to include a first panel 10A, a second panel 20A, and a connecting member 80.

[0047] Four first engagement recesses 13a are formed in the first panel 10A, each opening toward the second panel 20A. Second engagement recesses 23a are formed in the second panel 20A, each opening toward the first panel 10A. The second engagement recesses 23a are formed at positions that coincide with the first engagement recesses 13a in the direction facing the first panel 10A (horizontal direction).

[0048] The first engagement recesses 13a and the second engagement recesses 23a are both blind holes. The first engagement recesses 13a and the second engagement recesses 23a may have the same opening size in the thickness direction, or may be formed so that the opening size increases as they progress in the thickness direction. The number of first engagement recesses 13a and second engagement recesses 23a is not particularly limited.

[0049] The connecting member 80 is configured to have a rod-shaped body 81 extending between the first panel 10A and the second panel 20A, a first engagement portion 82a provided on one end side of the rod-shaped body 81 and engaging with the first engagement recess 13a, and a second engagement portion 82b provided on the other end side of the rod-shaped body 81 and engaging with the second engagement recess 23a.

[0050] The first engagement portion 82a engages with the first engagement recess 13a, and the second engagement portion 82b engages with the second engagement recess 23a, whereby the connecting member 80 connects the first panel 10A and the second panel 20A.

[0051] For example, the first engagement portion 82a and the second engagement portion 82 are configured by attaching fixing members 85 to both ends of a rod-shaped body 81. The fixing member 85 may be configured, for example, with a truncated conical expansion key 86 and a cylindrical expansion portion 87 with three or more notches at approximately equal intervals extending from one end in the extension direction. By pressing the expansion key 86 from its small diameter side toward the notched side of the expansion portion 87, the diameter of the fixing member 85 on the side where the expansion key 86 is inserted expands, and the fixing member 85 fits into the first engagement recess 13a of the first panel 10A and the second engagement recess 23a of the second panel 20A, thereby fixing the first panel 10A and the second panel 20A together via the rod-shaped body 81. In order to attach the fixing member 85 to the rod-shaped body 81, the expanded diameter portion 87 has threads on both ends of the rod-shaped body 81, and the inside of the side without the notch has a female screw thread that corresponds to the thread of the rod-shaped body 81.

[0052] Furthermore, in order to ensure the fixing depth and adhesive strength of the second panel 20A, the thickness of the second panel 20A may be increased only near the second engagement recess 23a. Similarly, the thickness of the first panel 10A may be increased only near the first engagement recess 13a.

[0053] During actual installation, fixing members 85 are attached to both ends of rod-shaped body 81, and then rod-shaped body 81 is inserted into first panel 10A and second panel 20A. A pushing force is applied to expansion keys 86 at the ends of fixing member 85 to expand the diameter and secure the rod-shaped body 81. To do this, a rubber hammer, or a stone hammer or wooden mallet placed over a backing plate is used to strike first engagement recess 13a and second engagement recess 23a, to which rod-shaped body 81 is attached, from the opposite side of first panel 10A and second panel 20A, in the extension direction of rod-shaped body 81, thereby applying a force that pushes expansion keys 86 into expansion portions 87 and expanding the diameter of fixing member 85. When the tips of fixing member 85 open, rod-shaped body 81 is secured to first engagement recess 13a and second engagement recess 23a.

[0054] Fig. 6C is a side view of a sound insulating wall unit 1B according to a second modified example. For example, as shown in Fig. 6C, with respect to a first engagement portion 92a and a second engagement portion 92b, which are both ends of a rod-shaped body 90, the first engagement portion 92a may be a right-handed thread (a normal thread that tightens when turned to the right) and the second engagement portion 92b may be a left-handed thread (a reverse-thread thread that tightens when turned to the left), and the second engagement portion 92b may be an insert for a right-handed thread and the first engagement portion 92a an insert for a left-handed thread, so that the first panel 10B and the second panel 20B can be fixed together by turning the rod-shaped body 90 clockwise (the direction in which a right-handed thread is tightened) toward the second panel 20A. At this time, a large torque is required to rotate and tighten the rod-shaped body 90, so if a cross section of a portion of the rod-shaped body 90 in the extension direction, for example the cross section of the switching section 99 located near the center, is made hexagonal so that an adjustable wrench, spanner, etc. can engage and the rod-shaped body 90 can be easily rotated, it becomes easier to tighten the rod-shaped body 90.

[0055] 7(a) is a schematic diagram showing an example of temporarily fixing the second panel 20. For ease of explanation, the following describes the positioning of the second panel 20 of the sound insulating wall unit 1, which is tall and therefore receives more wind load and is therefore at a disadvantage in terms of tipping over, but the same can be done when positioning the first panel 10.

[0056] As shown in Fig. 7(a), a first guide 61 serving as a positioning member is erected on the deck slab 101. The first guide 61 is, for example, a plate-shaped member extending in the vertical direction, and a portion of the first guide 61 is embedded in the deck slab 101. The second panel 20 is guided downward (in the direction of the arrow) along the first guide 61 and installed on the deck slab 101.

[0057] Furthermore, the second panel 20 can also be temporarily fixed to the first guide 61. Specifically, as shown in FIG. 7(a), a receiving metal fitting 64 is attached to the second panel 20 with a screw 65 so as to engage with the first guide 61. The receiving metal fitting 64 is offset in its thickness direction by the thickness of the first guide 61 on the deck slab 101 side and the opposite side (fixed side), so that the receiving metal fitting 64 is tightly attached to the second panel 20 with the screw 65 on the fixed side, and the first guide 61 is inserted into the gap formed between the second panel 20 and the receiving metal fitting 64 on the deck slab 101 side, thereby fixing the second panel 20 to the first guide 61.

[0058] This makes it possible to prevent the second panel 20 from tipping inward onto the deck 101 due to a lateral load acting on the second panel 20, and the second panel 20 from falling out of the viaduct from the deck 101 on the viaduct.

[0059] FIG. 7(b) is a schematic diagram showing another example of positioning the second panel 20. As shown in FIG. 7(b), a second guide 62 serving as a positioning member is fixed to the deck slab 101. The second guide 62 is an L-shaped member in a side view, composed of a horizontal portion 62a and a vertical portion 62b, and the horizontal portion 62a is fixed to the deck slab 101 with a screw 63. The second panel 20 is guided downward (in the direction of the arrow) along the vertical portion 62b and installed on the deck slab 101. Furthermore, the second panel 20 can be temporarily fixed to the second guide 62, just as when the first guide 61 is used.

[0060] 8 is a diagram showing the state in which the sound insulating wall units 1 are engaged with each other. When the sound insulating wall units 1 are joined together, the first panels 10 and the second panels 20 are joined together along the width direction. The first panels 10 are joined together by first engaging members 12 formed at their ends in the width direction. The second panels 20 are joined together by second engaging members 22 formed at their ends in the width direction.

[0061] Engagement of the first engaging members 12 with each other makes it difficult for gaps to form between the first panels 10, improving the adhesion between the first panels 10. Furthermore, engagement of the second engaging members 22 with each other makes it difficult for gaps to form between the second panels 20, improving the adhesion between the second panels 20. This makes it possible to prevent the concrete filled in the gap G from leaking out from the gap between the first panel 10 and the second panel 20.

[0062] FIG. 9 is a schematic cross-sectional view showing a state in which the sound insulating wall unit 1 placed on the floor slab 101 is filled with concrete C, and FIG. 10 is a schematic plan view thereof.

[0063] As shown in Figure 9, main reinforcement bars 71 and distribution reinforcement bars 72 are arranged in the gap G formed between the first panel 10 and the second panel 20. The main reinforcement bars 71 are the ends of main reinforcement bars arranged in the deck slab 101 that are raised upward, and by placing the distribution reinforcement bars 72 in the gap G, the deck slab 101 and the sound insulating wall unit 1 can be structurally integrated into one strong unit. In addition, concrete C is filled in the gap G up to the upper end of the first panel 10. The concrete C filled in the gap G makes the first panel 10 and the second panel 20 continuous.

[0064] As shown in Fig. 10, concrete C is filled into a sound-insulating wall unit 1 arranged along the direction of movement of a noise source. Specifically, concrete C is filled into a gap G formed between a first panel 10 and a second panel 20 arranged successively along the direction of movement of the noise source.

[0065] 11 is an explanatory diagram showing the state in which a concrete roadbed 52 and a railroad track 102 have been laid on a deck slab 101. The concrete roadbed 52 for laying the railroad track 102 is formed on the deck slab 101, and the railroad track 102 is installed on the concrete roadbed 52. A ground protection section 51 is constructed on the outside of the concrete roadbed 52. A sound insulation wall unit 1 in which the ground protection section (ground protection section 51) and the sound insulation wall section (the upper part of the second panel 20) are integrated is constructed along the direction in which the railroad track 102 extends.

[0066] The ground cover portion 51 is composed of the first panel 10, the lower portion of the second panel 20, and concrete C filled between the first panel 10 and the second panel 20. The top surface of the ground cover portion 51 is approximately the same height as the top surface of the roadbed concrete 52.

[0067] The first panel 10 and the second panel 20 are connected by the concrete C. That is, the concrete C serves to adhere the first panel 10 and the second panel 20 to each other. This prevents the second panel 20 from falling outward, even if wind pressure or the like acts on the second panel 20 located on the outside, causing a force that pulls the second panel 20 away from the first panel 10.

[0068] Thus, the sound insulating wall unit 1 according to the embodiment includes a first panel 10 erected on the side closer to the noise source, a second panel 20 erected higher than the first panel 10 on the side farther from the noise source, and a connecting member 30 provided along a direction intersecting the direction of movement so as to form a space between the opposing first panel 10 and second panel 20 into which concrete C is to be filled. The sound insulating wall unit 1 configured in this manner is placed, for example, beside a track 102 along which a train 103 runs. This makes it possible to prevent noise from diffusing to the surrounding area.

[0069] In particular, the concrete C filled in the space (gap G) between the first panel 10 and the second panel 20, both of which are made of precast concrete, and the first panel 10 and the second panel 20 on either side thereof, can function as the ground protection section 51. Therefore, by simply filling the space between a pair of panels that function as wall surfaces with concrete C, it is possible to form a sound insulating wall unit 1 that functions as both a ground protection section and a sound insulating wall, without the need for a strict positioning process using anchor bolts. This makes it possible to achieve both the functions of a ground protection section and a sound insulating wall with a single configuration, the sound insulating wall unit 1.

[0070] Furthermore, the first panel 10 is formed with a through-hole 13 penetrating through it in the thickness direction, and the second panel 20 is formed with an insertion hole 23 that opens toward the first panel 10, and the connecting member 30 is configured to include a rod-shaped body 31 having one end inserted into the through-hole 13 and the other end inserted into the insertion hole 23, and a nut 32 as a fixing member that fixes the rod-shaped body 31 inserted into the through-hole 13 to the first panel 10. This makes it possible to omit the work of tightening the nut or filling the gap on the second panel 20 side. Therefore, the first panel 10 and the second panel 20 can be connected with a simple structure.

[0071] The first panel 10 may be formed with a first engagement recess 13a that opens toward the second panel 20, and the second panel 20 may be formed with a second engagement recess 23a that opens toward the first panel 10, and the connecting member 30 may be configured to include a rod-shaped body 81 extending between the first panel 10 and the second panel 20, a first engagement portion 82a provided at one end of the rod-shaped body and engaging with the first engagement recess 13a, and a second engagement portion 82b provided at the other end of the rod-shaped body and engaging with the second engagement recess 23a. In short, since the first panel 10 and the second panel 20 can be connected by the connecting member 80 having a pair of protrusions, work such as tightening nuts on the first panel 10 and the second panel 20 can be omitted. This makes it possible to connect the first panel 10 and the second panel 20 with a simple configuration.

[0072] Furthermore, a concrete adhesion portion 40 is formed on at least one of the opposing surfaces of the first panel 10 and the second panel 20. This allows for increased adhesion between the first panel 10 and the second panel 20.

[0073] Furthermore, the thickness of the upper end of the second panel 20 is thinner than the thickness of the lower end, so even if the height of the second panel increases, an increase in weight can be suppressed.

[0074] Furthermore, in a sound insulation wall structure in which multiple sound insulation wall units 1 are arranged in parallel along the direction of movement of the noise source, the space formed between the opposing first panel 10 and second panel 20 is filled with concrete C with reinforcing bars arranged therein. This increases the rigidity of the lower part of the sound insulation wall structure. Furthermore, if the reinforcing bars are erected from the floor slab, the floor slab and the sound insulation wall units can be firmly integrated.

[0075] Furthermore, first engagement members 12 are provided at both widthwise ends of the first panel 10 to engage with other adjacent first panels 10, and second engagement members 22 are provided at both widthwise ends of the second panel 20 to engage with other adjacent second panels 20. This increases the adhesion between adjacent panels and increases the rigidity of the lower part of the sound insulation wall structure.

[0076] (Second embodiment) Next, a sound insulating wall unit 1C according to a second embodiment will be described with reference to Fig. 12. Note that the following mainly describes the configurations that differ from the first embodiment, and components that are common to these embodiments are given the same reference numerals and will not be described in detail.

[0077] Fig. 12 is a perspective view of a sound insulating wall unit 1C. As shown in Fig. 12, in the second embodiment, plate-like members 130 are provided as connecting members that connect the first panel 10 and the second panel 20. Specifically, three plate-like members 130 are arranged between the first panel 10 and the second panel 20 along the width direction. Note that there are no particular limitations on the width of the plate-like members 130 and the number of plate-like members 130 provided.

[0078] In this way, the second embodiment provides a plate-like member 130 that connects the opposing surfaces of the first panel 10 and the second panel 20. This makes it possible to increase the rigidity of the sound insulating wall unit 1C compared to when the first panel 10 and the second panel 20 are simply connected by a rod-like member.

[0079] (Third embodiment) Next, a sound insulating wall unit 1D according to a third embodiment will be described with reference to Fig. 13. Note that the following mainly describes the configurations that differ from the first embodiment, and components that are common to these embodiments are given the same reference numerals and will not be described in detail.

[0080] Fig. 13 is a perspective view of a sound insulating wall unit 1D. As shown in Fig. 13, in the third embodiment, a first panel 10, a second panel 20, and a plate-like member 130 are integrally formed, and openings 130a are formed in the plate-like member 130, penetrating the plate-like member 130 in the plate thickness direction. The openings 130a are formed in, for example, two locations in the plate-like member 130. Note that the positions, number, and size of the openings 130a are not particularly limited.

[0081] Thus, in the third embodiment, the plate-like member 130 is formed with openings 130a that penetrate in the plate thickness direction. This allows reinforcement to be placed through the openings 130a, thereby increasing the rigidity of the lower part of the sound-insulating wall unit 1D.

[0082] Each embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to these embodiments, and design changes that do not deviate from the gist of the present invention are included in the present invention. [Explanation of symbols]

[0083] 1, 1A, 1B, 1C, 1D: Sound insulation wall unit 10: First panel 12: First engaging member 13: First through hole 20: Second panel 22: Second engaging member 23: Insertion hole 30: Rod-shaped body 31: Plate-shaped member 32 :Aperture 40: Concrete adhesion area 101: Floor slab

Claims

1. A precast concrete sound insulation wall unit that is arranged along the direction of movement of a noise source, a first panel erected on a side closer to the noise source; a second panel that is erected higher than the first panel on a side farther from the noise source; a connecting member arranged along a direction intersecting the movement direction so as to form a space for filling with concrete between the opposing first and second panels.

2. The first panel has a through hole formed therethrough in a thickness direction, The second panel has an insertion hole formed therein that opens toward the first panel, 2. The sound-insulating wall unit according to claim 1, wherein the connecting member comprises a rod-shaped body having one end inserted into the through hole and the other end inserted into the insertion hole, and a fixing member that fixes the rod-shaped body inserted into the through hole to the first panel.

3. The first panel has a first engagement recess formed therein that opens toward the second panel, The second panel is formed with a second engagement recess that opens toward the first panel, 2. The sound-insulating wall unit according to claim 1, wherein the connecting member comprises a rod-shaped body extending between the first panel and the second panel, a first engagement portion provided on one end of the rod-shaped body and engaging with the first engagement recess, and a second engagement portion provided on the other end of the rod-shaped body and engaging with the second engagement recess.

4. 2. The sound insulating wall unit according to claim 1, wherein the connecting member is formed of a plate-like member that connects opposing surfaces of the first panel and the second panel.

5. 5. The sound insulating wall unit according to claim 4, wherein the plate-like member has an opening formed therethrough in the thickness direction of the plate.

6. 6. The sound insulating wall unit according to claim 1, wherein a concrete attachment portion is formed on at least one of the opposing surfaces of the first panel and the second panel.

7. 6. The sound insulating wall unit according to claim 1, wherein the thickness of the upper end of the second panel is thinner than the thickness of the lower end of the second panel.

8. A sound insulating wall structure in which a plurality of sound insulating wall units according to any one of claims 1 to 5 are arranged in parallel along the movement direction, A sound insulation wall structure characterized in that the space formed between the opposing first and second panels is filled with concrete with reinforcing bars arranged therein.

9. a first engaging member that engages with another adjacent first panel is provided at each end of the first panel in the width direction; 9. The sound insulating wall structure according to claim 8, wherein second engaging members are provided at both widthwise ends of the second panel for engaging with adjacent second panels.

10. a step of arranging a plurality of sound insulating wall units according to any one of claims 1 to 5 in parallel on a concrete floor slab; and filling a space formed between the first panel and the second panel with concrete.

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