Mounting structure for cushioning member and cushioning member

Abstract

To provide a buffer member fitting structure capable of easily fitting or detaching a buffer member to or from a dam body and suppressing displacement of the buffer member with respect to the dam body.SOLUTION: A buffer member fitting structure 200 according to an embodiment has a body steel pipe 80 constituting a dam body 8 and a buffer member 1 fitted to the body steel pipe 80. The buffer member 1 has a buffer steel pipe 10 disposed along the body steel pipe 80, and a fitting mechanism 2 for detachably fitting the body steel pipe 80 to the buffer steel pipe 10. The fitting mechanism 2 has a fitting plate part 21 to be fitted to the buffer steel pipe 10 and a contact member 22 coming in contact with the body steel pipe 80. The fitting plate part 21 and the contact member 22 are fixed by sandwiching the body steel pipe 80.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an attachment structure of a buffer member in a permeable sand control dike and a buffer member.

Background Art

[0002] As a technology related to a permeable sand control dike for preventing disasters caused by earth and sand and drifting wood, the disclosed technologies of Patent Documents 1 to 3 in which a buffer member is attached to a dam body are disclosed.

[0003] In the permeable sand control dam of Patent Document 1, a buffer means is attached to a dam body via a polyhedral steel box-shaped coupling element for coupling a column member and a beam member to each other. The inside of the steel box-shaped coupling element is filled with concrete.

[0004] In the permeable sand control dam of Patent Document 2, a buffer means for absorbing the collision energy of boulders during floods is detachably attached to the upstream surface of the dam body via a bracket with respect to the dam body. The dam body is composed of steel columns fixed on a foundation concrete or on the ground and steel beam members fixed between the columns. The columns and the beam members are coupled to each other via a polyhedral steel box-shaped coupling element, and the axial centers of the column member and the beam member are concentrated at one point inside the steel box-shaped coupling element.

[0005] In the permeable sand control dam of Patent Document 3, a buffer means for absorbing the collision energy of boulders during floods is detachably attached to the upstream surface of the dam body via a bracket with respect to the dam body. The bracket is attached facing the downstream surface side of the buffer means and is not exposed on the upstream surface side. The buffer means is characterized by being divided into a plurality of pieces in the vertical direction.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] In the permeable sediment control dam described in Patent Document 1, concrete is filled inside the steel box-shaped connecting element. As a result, the installation of the dam body becomes complicated, and the installation of the buffering means cannot be easily performed.

[0008] In the permeable sediment control dams described in Patent Documents 2 and 3, although buffering means are attached to the steel pipes of the dam body, processing such as drilling holes for bolt fixing and welding of flange joint connections is required. As a result, the installation of the buffering means to the dam body becomes complicated, and it is not easy to attach and detach the buffering means.

[0009] Therefore, the present invention was devised in view of the above circumstances, and its objective is to provide a mounting structure for a buffer member and a buffer member that can be easily attached to and detached from the main body of a dam. [Means for solving the problem]

[0010] The mounting structure for a buffer member according to the present invention is a mounting structure for a buffer member to be attached to the dam body of a permeable sediment control dam, comprising a main steel pipe constituting the dam body, and a buffer member attached to the main steel pipe, wherein the buffer member has a buffer steel pipe arranged along the main steel pipe, and a mounting mechanism for detachably attaching the main steel pipe to the buffer steel pipe, the mounting mechanism has a mounting plate portion attached to the buffer steel pipe, and the mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The mounting mechanism further includes a holding member that holds the position of the contact member, the contact member has a U-shaped bolt fastened to the mounting plate portion, the main steel pipe is positioned inside the curved portion of the U-shaped bolt, the holding member has a plurality of protrusions protruding from the outer surface of the main steel pipe, and the plurality of protrusions are positioned in contact with both sides of the U-shaped bolt. It is characterized by the following. The mounting structure for a buffer member according to the present invention is a mounting structure for a buffer member to be attached to the main body of a permeable sediment control dam, comprising a main body steel pipe constituting the main body of the dam, and a buffer member to be attached to the main body steel pipe, wherein the buffer member has a buffer steel pipe arranged along the main body steel pipe, and a mounting mechanism for detachably attaching the main body steel pipe to the buffer steel pipe, wherein the mounting mechanism has a mounting plate portion attached to the buffer steel pipe, and a contact member that contacts the main body steel pipe, wherein the mounting plate portion and the contact member are fixed by sandwiching the main body steel pipe, the mounting plate portion has a U-shaped notch, the main body steel pipe is arranged inside the U-shaped notch, and the contact member has a contact plate portion arranged across the U-shaped notch, and a fastening fitting for fastening the mounting plate portion and the contact plate portion. The mounting structure for a buffer member according to the present invention is a mounting structure for a buffer member to be attached to the dam body of a permeable sediment control dam, comprising a main steel pipe constituting the dam body, and a buffer member to be attached to the main steel pipe, wherein the buffer member has a buffer steel pipe arranged along the main steel pipe, and a mounting mechanism for detachably attaching the main steel pipe to the buffer steel pipe, the mounting mechanism has a mounting plate portion attached to the buffer steel pipe, and a contact member that contacts the main steel pipe, the mounting plate portion and the contact member fix the main steel pipe between them, and the The mounting plate portion is formed in a U-shape, curved along the outer surface of the main steel pipe, with notches formed at both ends. The contact member comprises a contact plate portion inserted into the notches and positioned to span the ends of both sides of the mounting plate portion, a fixing plate portion positioned across the notches, and a fastening fitting for fastening the fixing plate portion to the mounting plate portion. The fixing plate portion is positioned on the opposite side of the main steel pipe, across the contact plate portion, and in contact with the contact plate portion.

[0011] The buffer member according to the present invention is a buffer member attached to a main body steel pipe constituting a dam body of a permeable sand prevention dam, comprising a buffer steel pipe arranged along the main body steel pipe, and an attachment mechanism for detachably attaching the main body steel pipe to the buffer steel pipe, wherein the attachment mechanism has an attachment plate portion attached to the buffer steel pipe and a contact member contacted with the main body steel pipe, and the attachment plate portion and the contact member are fixed with the main body steel pipe sandwiched therebetween. The mounting mechanism further includes a holding member that holds the position of the contact member, the contact member has a U-shaped bolt fastened to the mounting plate portion, the main steel pipe is positioned inside the curved portion of the U-shaped bolt, the holding member has a plurality of protrusions protruding from the outer surface of the main steel pipe, and the plurality of protrusions are positioned in contact with both sides of the U-shaped bolt. It is characterized by the above. The buffer member according to the present invention is a buffer member attached to the main body steel pipe constituting the dam body of a permeable sediment control dam, and comprises a buffer steel pipe arranged along the main body steel pipe, and a mounting mechanism for detachably attaching the main body steel pipe to the buffer steel pipe, the mounting mechanism comprising a mounting plate portion attached to the buffer steel pipe, and a contact member in contact with the main body steel pipe, the mounting plate portion and the contact member fixed the main body steel pipe by sandwiching it, the mounting plate portion having a U-shaped cutout portion, the main body steel pipe being arranged inside the U-shaped cutout portion, and the contact member comprising a contact plate portion arranged straddling the U-shaped cutout portion, and a fastening fitting for fastening the mounting plate portion and the contact plate portion. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​FIG. 8 is a view showing a second modification of the attachment structure of the buffer member in the first embodiment from a direction along the pipe axis direction of the main body steel pipe. [Figure 9] FIG. 9 is a view showing a third modification of the attachment structure of the buffer member in the first embodiment from a direction along the pipe axis direction of the main body steel pipe. [Figure 10] FIG. 10 is a perspective view showing an example of the attachment structure of the buffer member in the second embodiment. [Figure 11] FIG. 11 is a view showing an example of the attachment structure of the buffer member in the second embodiment from a direction along the pipe axis direction of the main body steel pipe. [Figure 12] FIG. 12 is a perspective view showing an example of the attachment structure of the buffer member in the third embodiment. [Figure 13] FIG. 13 is a view showing an example of the attachment structure of the buffer member in the third embodiment from a direction along the pipe axis direction of the main body steel pipe. [Figure 14] FIG. 14 is a perspective view showing an example of the attachment structure of the buffer member in the fourth embodiment. [Figure 15] FIG. 15(a) is a view showing an example of the attachment structure of the buffer member in the fourth embodiment from a direction along the pipe axis direction of the main body steel pipe, and FIG. 15(b) is a side view showing an example of the attachment structure of the buffer member in the fourth embodiment. [Figure 16] FIGS. 16(a) and 16(b) are views showing an example of the attachment method of the buffer member in the fourth embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, the attachment structure of the buffer member to which the present invention is applied and the mode for implementing the buffer member will be described in detail with reference to the drawings. In each figure, the vertical direction is defined as the Z direction, the direction in which the flowing-down material flows is defined as the flowing-down direction X, and the direction intersecting the vertical direction Z and the flowing-down direction X is defined as the width direction Y. The flowing-down direction X has an upstream side X1 and a downstream side X2.

[0015] (First Embodiment) Figure 1 is a perspective view showing an example of a permeable sediment control dam 100 in the first embodiment. Figure 2 is a side view showing an example of a permeable sediment control dam 100 in the first embodiment.

[0016] The permeable sediment control dam 100 captures flowing materials such as gravel and sediment. The permeable sediment control dam 100 comprises a dam body 8 and a buffer member 1 that is detachably attached to at least one of the upstream side X1 and the upper side of the dam body 8. The mounting structure 200 for the buffer member comprises a main steel pipe 80 that constitutes the dam body 8 and a buffer member 1 that is attached to at least the upstream side of the dam body 8. The buffer member 1 may also be attached to the upper side of the dam body 8.

[0017] The buffer member 1 absorbs the impact energy when large rocks or other debris collide with the dam, mitigating the impact energy transmitted to the dam body 8. Since the buffer member 1 is detachably attached to the dam body 8, even if the buffer member 1 is damaged by a collision with rocks, the damaged buffer member 1 can be easily replaced with a new one.

[0018] (Weir body 8) The dam body 8 is erected on a foundation 9 such as a concrete foundation or ground. The dam body 8 has multiple main steel pipes 80, and is composed of multiple main steel pipes 80 combined together. The main steel pipes 80 include a first main steel pipe 81, a second main steel pipe 82, a third main steel pipe 83, and a connecting main steel pipe 84.

[0019] The first main steel pipe 81 extends in the vertical direction Z, for example, in the vertical direction. The first main steel pipe 81 is positioned on the upstream X1 side of the dam body 8, and its lower end is embedded and fixed in the foundation 9. Multiple first main steel pipes 81 are arranged spaced apart in the width direction Y. The first main steel pipe 81 may have multiple horizontal members 89 extending in the vertical direction Z, which extend in the width direction Y. The presence of horizontal members 89 in the first main steel pipe 81 further suppresses the flow of captured gravel and other debris downstream X2 of the dam body 8.

[0020] The second main steel pipe 82 is positioned downstream X2 in the flow direction X from the first main steel pipe 81. The second main steel pipe 82 is positioned along the flow direction X. The second main steel pipe 82 is a diagonal member that slopes downward as it approaches the downstream side X2. The upper end of the second main steel pipe 82 is connected to the first main steel pipe 81 by welding, and the lower end is embedded and fixed in the foundation 9. Multiple second main steel pipes 82 are positioned spaced apart in the width direction Y.

[0021] The third main steel pipe 83 extends in the width direction Y. The third main steel pipe 83 connects multiple first main steel pipes 81 that are spaced apart in the width direction Y.

[0022] The connecting main steel pipe 84 is connected to the first main steel pipe 81 and the second main steel pipe 82 by welding or other means.

[0023] (Cushioning member 1) Figure 3 is a perspective view showing an example of the mounting structure 200 for the buffer member in the first embodiment. Figure 4 is a diagram showing an example of the mounting structure 200 for the buffer member in the first embodiment from the main steel pipe 80 side. Figure 5 is a diagram showing an example of the mounting structure 200 for the buffer member in the first embodiment from a direction along the pipe axis direction of the main steel pipe. The buffer member 1 comprises a buffer steel pipe 10 and a mounting mechanism 2 for detachably attaching the buffer steel pipe 10 to the main steel pipe 80.

[0024] The buffer steel pipe 10 is arranged along the main steel pipe 80. Preferably, the buffer steel pipe 10 is hollow. This further improves the energy absorption capacity of the buffer steel pipe 10 and further reduces the support reaction force transmitted to the main steel pipe 80.

[0025] The longitudinal length of the buffer steel pipe 10 is preferably, for example, a maximum of 4.0m to 6.0m. This improves the transportability of the buffer steel pipe 10 by vehicle and improves the constructability of the permeable sediment control dam 100. The longitudinal length of the buffer steel pipe 10 is preferably, for example, a minimum of 1.0m. The plate thickness of the buffer steel pipe 10 is preferably, for example, less than the plate thickness of the main steel pipe 80. The outer diameter of the buffer steel pipe 10 is preferably, for example, greater than or equal to the outer diameter of the main steel pipe 80.

[0026] The buffer steel pipe 10 comprises a first buffer steel pipe 11, a second buffer steel pipe 12, and a third buffer steel pipe 13.

[0027] The first buffer steel pipe 11 is positioned upstream X1 of the first main steel pipe 81. The lower end of the first buffer steel pipe 11 is spaced apart from the foundation 9. A single first buffer steel pipe 11 is provided with, for example, two mounting mechanisms 2.

[0028] The second buffer steel pipe 12 is positioned above the second main steel pipe 82. The lower end of the second buffer steel pipe 12 is spaced apart from the foundation 9. Each second buffer steel pipe 12 is provided with, for example, two mounting mechanisms 2.

[0029] The third buffer pipe 13 is positioned above the first main steel pipe 81. The third buffer pipe 13 extends in the direction of flow X. Preferably, the upstream end X1 of the third buffer pipe 13 is welded to the outer surface of the downstream end X2 of the first buffer pipe 11. This prevents the upstream end X1 of the third buffer pipe 13 from being exposed to the upstream end X1 and ensures that it is covered by the first main steel pipe 81. This prevents debris such as gravel from colliding with the third buffer pipe 13 from the upstream end X1. Although not shown in the illustration, the upper end of the first buffer pipe 11 may also be welded to the lower outer surface of the third buffer pipe 13.

[0030] The mounting mechanism 2 includes a mounting plate portion 21 that is attached to the buffer steel pipe 10, a contact member 22 that contacts the main steel pipe 80, and a holding member 23 that holds the position of the contact member 22. The mounting plate portion 21 and the contact member 22 are fixed together by sandwiching the main steel pipe 80.

[0031] The mounting plate portion 21 is made of, for example, a steel plate. One end of the connecting steel pipe 24 is welded to the surface of the mounting plate portion 21 that faces the buffer steel pipe 10. The other end of the connecting steel pipe 24 is welded to the buffer steel pipe 10. The outer diameter of the connecting steel pipe 24 may be smaller than the outer diameter of the main steel pipe 80.

[0032] The contact member 22 has a U-shaped bolt 22a that is fastened to the mounting plate portion 21. The main steel pipe 80 of the U-shaped bolt 22a is positioned inside the curved portion.

[0033] The retaining member 23 has a plurality of protrusions 23a, 23b that project from the outer surface of the main steel pipe 80. The plurality of protrusions 23a, 23b are arranged in a staggered pattern, touching both sides of the U-bolt 22a. The number of protrusions 23a, 23b is arbitrary.

[0034] The projection 23a contacts the underside of the U-bolt 22a. This prevents the U-bolt 22a from falling downwards. The two projections 23a are positioned on both sides of the main steel pipe 80.

[0035] The projection 23b contacts the upper side of the U-bolt 22a. This prevents the U-bolt 22a from rising upward. One projection 23b is positioned on the opposite side of the mounting plate portion 21, with the main steel pipe 80 in between.

[0036] According to this embodiment, the mounting mechanism 2 includes a mounting plate portion 21 that is attached to the buffer steel pipe 10 and a contact member 22 that contacts the main steel pipe 80, and the mounting plate portion 21 and the contact member 22 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be easily attached to and detached from the main steel pipe 80.

[0037] According to this embodiment, the position of the contact member 22 is maintained by the holding member 23. This makes it possible to suppress displacement of the buffer member 1 relative to the dam body 8 even when gravel or the like collides with it.

[0038] Furthermore, according to this embodiment, the mounting plate portion 21 and the contact member 22 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be attached whether the dam body 8 is newly constructed or existing. Therefore, a highly versatile buffer member 1 can be provided.

[0039] According to this embodiment, the contact member 22 has a U-shaped bolt 22a fastened to the mounting plate portion 21, the main steel pipe 80 is positioned inside the curved portion of the U-shaped bolt 22a, and the holding member 23 has a plurality of protrusions 23a, 23b protruding from the outer circumferential surface of the main steel pipe 80, the plurality of protrusions 23a, 23b are positioned in contact with both sides of the U-shaped bolt 22a. As a result, the position of the U-shaped bolt 22a is maintained by the protrusions 23a, 23b. Therefore, even if gravel or the like collides with it, the displacement of the buffer member 1 relative to the dam body 8 can be further suppressed.

[0040] Furthermore, according to this embodiment, the multiple protrusions 23a and 23b can be used as guides for the mounting position of the U-bolt 22a. This makes it easier to install the buffer steel pipe 10.

[0041] According to this embodiment, the contact member 22 has a U-shaped bolt 22a that is fastened to the mounting plate portion 21. This makes it easy to replace the cushioning member 1 even if it is damaged.

[0042] The plate thickness of the buffer steel pipe 10 is, for example, less than the plate thickness of the main steel pipe 80. This causes the buffer steel pipe 10 to undergo dentation deformation before the main steel pipe 80, thereby reducing the impact energy of the debris flow acting on the dam body 8. In other words, it is possible to improve the buffering effect, which allows for obtaining a large absorption capacity energy with a small load. As a result, damage to the dam body 8 can be suppressed.

[0043] The outer diameter of the buffer steel pipe 10 is, for example, greater than or equal to the outer diameter of the main steel pipe 80. This makes the net distance between the outer surfaces of two adjacent buffer steel pipes 10 in the width direction Y smaller than the net distance between the outer surfaces of two adjacent main steel pipes 80 in the width direction Y. Therefore, when gravel or the like flows down in the flow direction X, the buffer steel pipe 10 can more easily capture the gravel or the like, and collisions with the main steel pipe 80 can be suppressed. As a result, damage to the dam body 8 can be suppressed.

[0044] According to this embodiment, the outer diameter of the buffer steel pipe 10 is larger than the outer diameter of the main steel pipe 80. This allows for a greater energy absorption capacity of the buffer steel pipe 10 compared to the case where the outer diameter of the buffer steel pipe 10 is the same as the outer diameter of the main steel pipe 80, while reducing the support reaction force transmitted to the main steel pipe 80. As a result, it is possible to further improve the buffering effect, which allows for obtaining a large amount of absorbed energy with a small load. Consequently, damage to the dam body 8 can be suppressed.

[0045] Furthermore, according to this embodiment, the outer diameter of the buffer steel pipe 10 is larger than the outer diameter of the main steel pipe 80. This allows the U-shaped bolts 22a to be positioned so that they are hidden on the back side of the buffer steel pipe 10 when viewed from the buffer steel pipe 10 side towards the main steel pipe 80 side. This protects the U-shaped bolts 22a from impacts such as gravel.

[0046] (First embodiment, first modified example) Figure 6 shows a first modified example of the mounting structure 200 for the buffer member in the first embodiment, viewed from a direction along the pipe axis of the main steel pipe. In the first modified example, the mounting plate portion 21 has a rubber material 25 provided on the surface facing the main steel pipe 80. The rubber material 25 is made of, for example, natural rubber obtained by chipping and solidifying vulcanized rubber. The rubber material 25 is formed in a plate shape.

[0047] According to this embodiment, the mounting plate portion 21 has a rubber material 25 provided on the surface facing the main steel pipe 80. This further suppresses the impact energy transmitted to the main steel pipe 80.

[0048] (Second modified example of the first embodiment) Figure 7 is a perspective view showing a second modified example of the mounting structure 200 for the buffer member in the first embodiment. Figure 8 is a diagram showing the second modified example of the mounting structure 200 for the buffer member in the first embodiment, viewed from a direction along the pipe axis direction of the main steel pipe 80. In the second modified example, one end of the connecting steel plate 26 is fixed to the mounting plate portion 21 on the side facing the buffer steel pipe 10 by welding. The other end of the connecting steel plate 26 is fixed to the buffer steel pipe 10 by welding. Multiple connecting steel plates 26 are provided on the mounting plate portion 21.

[0049] (Third modified example of the first embodiment) Figure 9 shows a third modified example of the mounting structure 200 for the buffer member in the first embodiment, viewed from a direction along the pipe axis of the main steel pipe. In the third modified example, the mounting plate portion 21 has a rubber material 25 provided on the surface facing the main steel pipe 80. The rubber material 25 is made of, for example, natural rubber obtained by chipping and solidifying vulcanized rubber. The rubber material 25 is formed in a plate shape.

[0050] (Second Embodiment) Figure 10 is a perspective view showing an example of the mounting structure 200 for the buffer member in the second embodiment. Figure 11 is a diagram showing an example of the mounting structure 200 for the buffer member in the second embodiment, viewed from a direction along the pipe axis of the main steel pipe 80. The mounting structure 200 for the buffer member in the second embodiment differs from the first embodiment mainly in that a steel plate curved along the main steel pipe 80 is used as the contact member 32.

[0051] The mounting mechanism 2 includes a mounting plate portion 31 that is attached to the buffer steel pipe 10, a contact member 32 that contacts the main steel pipe 80, and a holding member 33 that holds the position of the contact member 32. The mounting plate portion 31 and the contact member 32 are fixed together by sandwiching the main steel pipe 80.

[0052] The mounting plate portion 31 is made of, for example, a steel plate. One end of the connecting steel plate 34 is fixed to the side of the mounting plate portion 31 facing the buffer steel pipe 10 by welding. The other end of the connecting steel plate 34 is fixed to the buffer steel pipe 10 by welding.

[0053] The mounting plate portion 31 has a curved plate portion 31a formed by curving along the outer circumferential surface of the main steel pipe 80, and a first upright plate portion 31b that stands upright relative to the curved plate portion 31a. The curved plate portion 31a is formed by curving in a semicircular shape in a cross section perpendicular to the pipe axis direction of the main steel pipe 80. The first upright plate portions 31b are formed at both ends of the curved plate portion 31a.

[0054] The mounting plate portions 31 are provided in pairs, spaced apart in the axial direction of the main steel pipe 80.

[0055] The contact member 32 has a contact plate portion 32a formed by curving along the outer circumferential surface of the main steel pipe 80, a second upright plate portion 32b that stands upright relative to the contact plate portion 32a, and a fastening fitting 32c that fastens the first upright plate portion 31b and the second upright plate portion 32b. The contact plate portion 32a is formed by curving in a semicircular shape in a cross section perpendicular to the pipe axis direction of the main steel pipe 80. The second upright plate portions 32b are formed at both ends of the contact plate portion 32a. It is preferable that the second upright plate portion 32b is spaced apart from the first upright plate portion 31b. The second upright plate portion 32b may be in contact with the first upright plate portion 31b. For example, a bolt and nut can be used as the fastening fitting 32c.

[0056] The retaining member 33 has a plurality of protrusions 33a, 33b that project from the outer circumferential surface of the main steel pipe 80. The plurality of protrusions 33a, 33b are arranged in a staggered pattern, touching both sides of the contact plate portion 32a. The number of protrusions 33a, 33b is arbitrary.

[0057] The projection 33a contacts the lower side of the contact plate 32a. This prevents the contact plate 32a from falling downward. The two projections 33a are positioned on the downstream side X2 of the main steel pipe 80.

[0058] The projection 33b contacts the upper side of the contact plate portion 32a. This prevents the contact plate portion 32a from rising upward. One projection 33b is positioned on the downstream side X2 of the main steel pipe 80.

[0059] According to this embodiment, the mounting mechanism 2 includes a mounting plate portion 31 that is attached to the buffer steel pipe 10 and a contact member 32 that contacts the main steel pipe 80, and the mounting plate portion 31 and the contact member 32 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be easily attached to and detached from the main steel pipe 80.

[0060] According to this embodiment, the position of the contact member 32 is maintained by the holding member 33. This makes it possible to suppress displacement of the buffer member 1 relative to the dam body 8 even when gravel or the like collides with it.

[0061] Furthermore, according to this embodiment, the mounting plate portion 31 and the contact member 32 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be attached whether the dam body 8 is newly constructed or existing. Therefore, a highly versatile buffer member 1 can be provided.

[0062] According to this embodiment, the mounting plate portion 31 has a curved plate portion 31a that is formed to curve along the outer circumferential surface of the main steel pipe 80. As a result, the main steel pipe 80 and the mounting plate portion 31 make surface contact. Therefore, the buffer member 1 can be held more stably with respect to the dam body 8.

[0063] Furthermore, according to this embodiment, the mounting plate portion 31 has a curved plate portion 31a that is formed to curve along the outer surface of the main steel pipe 80. This allows the main steel pipe 80 to be guided into the curved plate portion 31a when attaching the buffer steel pipe 10 to the main steel pipe 80. This makes the installation of the buffer member 1 even easier.

[0064] According to this embodiment, the contact member 32 has a contact plate portion 32a that is curved along the outer circumferential surface of the main steel pipe 80. As a result, the main steel pipe 80 and the contact member 32 make surface contact. Therefore, the buffer member 1 can be held more stably with respect to the dam body 8.

[0065] According to this embodiment, the retaining member 33 has a plurality of protrusions 33a and 33b that project from the outer circumferential surface of the main steel pipe 80, and the plurality of protrusions 33a and 33b are arranged in contact with both sides of the contact plate portion 32a. As a result, the position of the contact plate portion 32a is maintained by the protrusions 33a and 33b. Therefore, even if gravel or the like collides with it, the displacement of the buffer member 1 relative to the dam body 8 can be further suppressed.

[0066] Furthermore, according to this embodiment, the multiple protrusions 33a and 33b can be used as guides for the mounting position of the contact plate portion 32a. This makes it easier to install the buffer steel pipe 10.

[0067] According to this embodiment, the second upright plate portion 32b is positioned spaced apart from the first upright plate portion 31b. This allows the main steel pipe 80 to be firmly held by the curved plate portion 31a and the contact plate portion 32a when the fastening fitting 32c is fastened.

[0068] According to this embodiment, the contact member 32 is fastened to the mounting plate portion 31 by the fastening fitting 32c. This makes it even easier to replace the damaged cushioning member 1 with a new one, even if the cushioning member 1 is damaged by a stone impact.

[0069] Furthermore, according to this embodiment, the outer diameter of the buffer steel pipe 10 is larger than the outer diameter of the main steel pipe 80. This allows the fastening fitting 32c to be positioned so that it is hidden on the back side of the buffer steel pipe 10 when viewed from the buffer steel pipe 10 side towards the main steel pipe 80 side. Therefore, the fastening fitting 32c can be protected from impacts such as gravel.

[0070] (Third embodiment) Figure 12 is a perspective view showing an example of the mounting structure 200 for the buffer member in the third embodiment. Figure 13 is a diagram showing an example of the mounting structure 200 for the buffer member in the third embodiment from a direction along the pipe axis direction of the main steel pipe 80. The mounting structure 200 for the buffer member in the third embodiment differs from the first embodiment mainly in that a steel plate having a U-shaped notch 41a cut out in a U-shape along the main steel pipe 80 is used as the mounting plate portion 41.

[0071] The mounting mechanism 2 includes a mounting plate portion 41 that is attached to the buffer steel pipe 10 and a contact member 42 that comes into contact with the main steel pipe 80. The mounting plate portion 41 and the contact member 42 are fixed together by sandwiching the main steel pipe 80.

[0072] The mounting plate portion 41 is made of, for example, a steel plate. The mounting plate portion 41 has a U-shaped notch 41a cut out in a U shape on one end and a semicircular notch 41b cut out on the other end. The main steel pipe 80 is placed inside the U-shaped notch 41a. The buffer steel pipe 10 is placed inside the notch 41b and welded to the buffer steel pipe 10.

[0073] The mounting plate portions 41 are provided in pairs, spaced apart in the axial direction of the main steel pipe 80. The pair of mounting plate portions 41 are connected to each other via a pair of connecting steel plates 44. The mounting plate portions 41 are fixed to the connecting steel plates 44 by welding. The pair of connecting steel plates 44 are arranged in contact with both sides of the main steel pipe 80.

[0074] The contact member 42 has a contact plate portion 42a positioned across the U-shaped notch portion 41a, and a fastening fitting 42c that fastens the mounting plate portion 41 and the contact plate portion 42a. The contact plate portion 42a is made of, for example, a rectangular steel plate. The fastening fitting 42c is made of, for example, a bolt and nut.

[0075] According to this embodiment, the mounting mechanism 2 has a mounting plate portion 41 that is attached to the buffer steel pipe 10 and a contact member 42 that comes into contact with the main steel pipe 80, and the mounting plate portion 41 and the contact member 42 are fixed by sandwiching the main steel pipe 80. This makes it possible to easily attach and detach the buffer steel pipe 10 from the main steel pipe 80.

[0076] Furthermore, the position of the contact member 42 is maintained by the holding member 43. This makes it possible to suppress displacement of the buffer member 1 relative to the dam body 8 even when gravel or the like collides with it.

[0077] Furthermore, according to this embodiment, the mounting plate portion 41 and the contact member 42 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be attached whether the dam body 8 is newly constructed or existing. Therefore, a highly versatile buffer member 1 can be provided.

[0078] According to this embodiment, the mounting plate portion 41 has a U-shaped cutout portion 41a, the main steel pipe 80 of which is positioned on the inside of the U-shaped cutout portion 41a, and the contact member 42 has a contact plate portion 42a positioned across the U-shaped cutout portion 41a and a fastening fitting 42c that fastens the mounting plate portion 41 and the contact plate portion 42a. As a result, when attaching the buffer steel pipe 10 to the main steel pipe 80, the main steel pipe 80 can be guided into the U-shaped cutout portion 41a and inserted. Therefore, the installation work of the buffer member 1 can be made even easier.

[0079] According to this embodiment, the contact member 42 is fastened to the mounting plate portion 41 by fastening fittings 42c. This makes it even easier to replace the damaged cushioning member 1 with a new one, even if the cushioning member 1 is damaged by a collision with a stone.

[0080] Furthermore, according to this embodiment, the outer diameter of the buffer steel pipe 10 is larger than the outer diameter of the main steel pipe 80. This allows the fastening fittings 42c to be positioned so that they are hidden on the back side of the buffer steel pipe 10 when viewed from the buffer steel pipe 10 side towards the main steel pipe 80 side. Therefore, the fastening fittings 42c can be protected from impacts such as gravel.

[0081] (Fourth Embodiment) Figure 14 is a perspective view showing an example of the mounting structure 200 for the buffer member in the fourth embodiment. Figure 15(a) is a view showing an example of the mounting structure 200 for the buffer member in the fourth embodiment from a direction along the pipe axis direction of the main steel pipe 80, and Figure 15(b) is a view showing an example of the mounting structure 200 for the buffer member in the fourth embodiment from a side view. The mounting structure 200 for the buffer member in the fourth embodiment differs from the first embodiment mainly in that a steel plate curved in a U shape along the main steel pipe 80 is used as the mounting plate portion 41.

[0082] The mounting mechanism 2 includes a mounting plate portion 51 that is attached to the buffer steel pipe 10 and a contact member 52 that comes into contact with the main steel pipe 80. The mounting plate portion 51 and the contact member 52 are fixed together by sandwiching the main steel pipe 80.

[0083] The mounting plate portion 51 is formed in a U-shape, curved along the outer surface of the main steel pipe 80. The mounting plate portion 51 has notches 51a formed at both ends. Multiple notches 51a are formed at each end. The mounting plate portion 51 is fixed to the buffer steel pipe 10 by welding via a connecting steel plate 54.

[0084] The contact member 52 includes a contact plate portion 52a positioned to span both ends of the mounting plate portion 51, a fixing plate portion 52b positioned across the notch portion 51a, and a fastening fitting 52c for fastening the fixing plate portion 52b to the mounting plate portion 51. For example, a rectangular steel plate is used for the contact plate portion 52a. The contact plate portion 52a is inserted into the notch portion 51a. The fixing plate portion 52b is positioned on the opposite side of the main steel pipe 80, with the contact plate portion 52a in between, and in contact with the contact plate portion 52a. For example, a bolt and nut are used as the fastening fitting 52c.

[0085] Next, an example of a method for attaching the cushioning member 1 in the fourth embodiment will be described. Figures 16(a) and 16(b) are cross-sectional views showing an example of a method for attaching the cushioning member 1 in the fourth embodiment.

[0086] First, a pre-curved U-shaped mounting plate 51 is fixed to the buffer steel pipe 10 by welding via a connecting steel plate 54. Then, the main steel pipe 80 is positioned so as to guide the U-shaped curved portion of the mounting plate 51 to the inside. This causes the mounting plate 51 to come into contact with the main steel pipe 80.

[0087] Then, as shown in Figure 16(a), the plate-shaped contact plate portion 52a is inserted into the notch 51a formed at the tip of the mounting plate portion 51. This causes the contact plate portion 52a to come into contact with the main steel pipe 80. The contact plate portion 52a is also positioned to span across the tips on both sides of the mounting plate portion 51.

[0088] Next, as shown in Figure 16(b), the fixing plate portion 52b is positioned across the notch portion 51a, and the fixing plate portion 52b is fastened to the mounting plate portion 51 with the fastening fitting 52c. At this time, the fixing plate portion 52b is positioned on the opposite side of the main steel pipe 80, with the contact plate portion 52a in between, and in contact with the contact plate portion 52a. This allows the mounting plate portion 51 and the contact plate portion 52a to be fixed together with the main steel pipe 80 in between.

[0089] According to this embodiment, the mounting mechanism 2 has a mounting plate portion 51 that is attached to the buffer steel pipe 10 and a contact member 52 that comes into contact with the main steel pipe 80, and the mounting plate portion 51 and the contact member 52 are fixed by sandwiching the main steel pipe 80. This makes it possible to easily attach and detach the buffer steel pipe 10 from the main steel pipe 80.

[0090] Furthermore, according to this embodiment, the position of the contact member 52 is maintained by the holding member 53. This makes it possible to suppress displacement of the buffer member 1 relative to the dam body 8 even when gravel or the like collides with it.

[0091] Furthermore, according to this embodiment, the mounting plate portion 51 and the contact member 52 are fixed by sandwiching the main steel pipe 80. This allows the buffer steel pipe 10 to be attached whether the dam body 8 is newly constructed or existing. Therefore, a highly versatile buffer member 1 can be provided.

[0092] According to this embodiment, the mounting plate portion 51 is formed in a U-shape, curved along the outer circumferential surface of the main steel pipe 80, with notches 51a formed at both ends. The contact member 52 has a contact plate portion 52a that is inserted into the notches 51a and positioned to span both ends of the mounting plate portion 51, a fixing plate portion 52b positioned across the notches 51a, and a fastening fitting 52c that fastens the fixing plate portion 52b to the mounting plate portion 51. The fixing plate portion 52b is positioned on the opposite side of the main steel pipe 80, across the contact plate portion 52a, and in contact with the contact plate portion 52a. This allows the main steel pipe 80 to be guided and inserted into the U-shaped curved mounting plate portion 51 when attaching the buffer steel pipe 10 to the main steel pipe 80. This makes the installation of the buffer member 1 even easier.

[0093] According to this embodiment, the fixing plate portion 53a is fastened to the mounting plate portion 51 by fastening fittings 52c. This makes it even easier to replace the damaged cushioning member 1 with a new one, even if the cushioning member 1 is damaged by a collision with a stone.

[0094] According to this embodiment, the mounting plate portion 51 is formed in a curved shape along the outer circumferential surface of the main steel pipe 80. As a result, the main steel pipe 80 and the mounting plate portion 51 make surface contact. Therefore, the buffer member 1 can be held more stably with respect to the dam body 8.

[0095] Mounting mechanism 2 is designed to detachably attach the main steel pipe 80 and the buffer steel pipe 10. For this reason, mounting mechanism 2 may also be designed to detachably attach the first main steel pipe 81 and the first buffer steel pipe 11. Mounting mechanism 2 may also be designed to detachably attach the second main steel pipe 82 and the second buffer steel pipe 12. Mounting mechanism 2 may also be designed to detachably attach the third main steel pipe 83 and the third buffer steel pipe 13.

[0096] Although some embodiments of this invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, this invention can be implemented in various novel forms in addition to the embodiments described above. Therefore, the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of symbols]

[0097] 100: Permeable sediment control dam 200: Mounting structure of cushioning material 1: Cushioning material 10:Buffer steel pipe 11: 1st buffer steel pipe 12:Second buffer steel pipe 13:Third buffer steel pipe 2: Mounting mechanism 21: Mounting plate section 22: Contact Member 22a: U-bolt 23: Retaining member 23a:Protrusion 23b:Protrusion 24: Connected steel pipe 25: Rubber material 26: Connecting steel plate 31: Mounting plate section 31a: Curved plate section 31b: First standing plate section 32: Contact member 32a: Contact plate portion 32b: Second standing plate section 32c: Fastening hardware 34: Connecting steel plate 41: Mounting plate section 41a: U-shaped notch 41b: Notch 42: Contact Member 42a: Contact plate portion 42c: Fastening hardware 44: Connecting steel plate 51: Mounting plate section 51a: Notch 52: Contact Member 52a: Contact plate portion 52b: Fixing plate section 52c: Fastening hardware 54: Connecting steel plate 80: Main body steel pipe 81: 1st main body steel pipe 82:Second main body steel pipe 83:Third main body steel pipe 84: Connected main body steel pipe 89: Horizontal material X: Downstream direction X1: Upstream side X2: Downstream side Y: width direction Z: Vertical direction

Claims

1. A mounting structure for a buffer member attached to the main body of a permeable sediment control dam, The dam comprises a main steel pipe constituting the main body of the dam, and a buffer member attached to the main steel pipe. The cushioning member comprises a cushioning steel pipe arranged along the main steel pipe, and a mounting mechanism for detachably attaching the main steel pipe to the cushioning steel pipe. The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, A contact member that comes into contact with the main steel pipe, It has, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The mounting mechanism further includes a holding member that holds the position of the contact member, The contact member has a U-shaped bolt fastened to the mounting plate portion, The U-shaped bolt has the main steel pipe positioned inside the curved portion. The retaining member has a plurality of protrusions that extend from the outer surface of the main steel pipe, The multiple protrusions are arranged in contact with both sides of the U-shaped bolt. A mounting structure for a cushioning member characterized by the following.

2. A mounting structure for a buffer member attached to the dam body of a permeable sediment control dam, The dam comprises a main steel pipe constituting the main body of the dam, and a buffer member attached to the main steel pipe. The cushioning member comprises a cushioning steel pipe arranged along the main steel pipe, and a mounting mechanism for detachably attaching the main steel pipe to the cushioning steel pipe. The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, A contact member that comes into contact with the main steel pipe, It has, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The aforementioned mounting plate portion is It has a U-shaped cutout, The U-shaped notch is positioned with the main steel pipe inside. The aforementioned contact member is A contact plate portion is positioned across the U-shaped notch, It has fastening fittings for fastening the mounting plate portion and the contact plate portion together. A mounting structure for a cushioning member characterized by the following.

3. A mounting structure for a buffer member attached to the dam body of a permeable sediment control dam, The dam comprises a main steel pipe constituting the main body of the dam, and a buffer member attached to the main steel pipe. The cushioning member comprises a cushioning steel pipe arranged along the main steel pipe, and a mounting mechanism for detachably attaching the main steel pipe to the cushioning steel pipe. The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, A contact member that comes into contact with the main steel pipe, It has, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The aforementioned mounting plate portion is The steel pipe body is formed in a U-shape, curved along its outer surface, and notches are formed at both ends. The aforementioned contact member is A contact plate portion is inserted into the notched portion and positioned to span the ends on both sides of the mounting plate portion, A fixing plate portion is positioned across the aforementioned notch, The fixing plate portion is fastened to the mounting plate portion, The fixing plate portion is positioned on the opposite side of the main steel pipe from the contact plate portion, and is in contact with the contact plate portion. A mounting structure for a cushioning member characterized by the following.

4. A buffer member attached to the main steel pipe that constitutes the dam body of a permeable sediment control dam, A buffer steel pipe arranged along the main steel pipe, and the main steel pipe detachably attached to the buffer steel pipe. It has a mounting mechanism for attaching to it, The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, It has a contact member that comes into contact with the main steel pipe, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The mounting mechanism further includes a holding member that holds the position of the contact member, The contact member has a U-shaped bolt fastened to the mounting plate portion, The U-shaped bolt has the main steel pipe positioned inside the curved portion. The retaining member has a plurality of protrusions that extend from the outer surface of the main steel pipe, The multiple protrusions are arranged in contact with both sides of the U-shaped bolt. A cushioning material characterized by the following.

5. A buffer member attached to the main steel pipe constituting the dam body of a permeable sediment control dam, The system includes a buffer steel pipe arranged along the main steel pipe and a mounting mechanism for detachably attaching the main steel pipe to the buffer steel pipe. The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, It has a contact member that comes into contact with the main steel pipe, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The aforementioned mounting plate portion is It has a U-shaped cutout, The U-shaped notch is positioned with the main steel pipe inside. The aforementioned contact member is A contact plate portion is positioned across the U-shaped notch, It has fastening fittings for fastening the mounting plate portion and the contact plate portion together. A cushioning material characterized by the following.

6. A buffer member attached to the main steel pipe constituting the dam body of a permeable sediment control dam, The system includes a buffer steel pipe arranged along the main steel pipe and a mounting mechanism for detachably attaching the main steel pipe to the buffer steel pipe. The aforementioned mounting mechanism is A mounting plate portion attached to the aforementioned buffer steel pipe, It has a contact member that comes into contact with the main steel pipe, The mounting plate portion and the contact member are fixed by sandwiching the main steel pipe. The aforementioned mounting plate portion is The steel pipe body is formed in a U-shape, curved along its outer surface, and notches are formed at both ends. The aforementioned contact member is A contact plate portion is inserted into the notched portion and positioned to span the ends on both sides of the mounting plate portion, A fixing plate portion is positioned across the aforementioned notch, The fixing plate portion is fastened to the mounting plate portion, The fixing plate portion is positioned on the opposite side of the main steel pipe from the contact plate portion, and is in contact with the contact plate portion. A cushioning material characterized by the following.

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