JP7669019B2 - Length adjustment jig - Google Patents

Description

The present invention relates to a length adjustment jig that allows panel materials such as remaining formwork (remaining formwork) to be hung and fastened so that the length can be freely adjusted.

Traditionally, reinforced earth walls have been constructed using the reinforced earth wall method as an alternative to block and concrete retaining walls. There are many different types of reinforced earth wall construction methods, depending on the type of reinforcing material and wall surface work used. For example, when constructing a geotextile reinforced earth wall, a steel frame is filled with soil (embankment) and set up in a stepped pattern, and a planar geotextile made of a polymeric material is laid as reinforcing material in the embankment to construct an earth retaining structure with a wall surface that is closer to vertical and has a steeper slope than the typical stable slope.

Sloping reinforced earth walls constructed in this way are generally planted with greenery on the wall surface. However, due to maintenance constraints such as the high cost of weed control, there is a strong demand not to plant greenery on the wall surface. Therefore, when greenery is not to be used, wall panels, which are residual formwork (remaining formwork), are installed by hanging them on the front of the reinforced earth wall via length adjustment fittings such as separators.

For example, Patent Document 1 discloses a method for constructing a leaning retaining wall (inclined wall type) in which a soil slope S is covered with a water-permeable mat 3, anchors 4 are driven into the slope S to fix the water-permeable mat 3, a foundation B is constructed, pillars 2 are installed, a concrete remaining formwork 1 is hung on the pillars 2, and backfill concrete C is poured between the slope S and the remaining formwork 1 (see paragraphs [0020] to [0030] of the specification of Patent Document 1, and Figures 1 and 3 of the drawings, etc.).

However, the remaining formwork 1 used in the method for constructing a lean-type retaining wall described in Patent Document 1 involves installing pillar materials on the slope side of the reinforced soil wall, and then adjusting the length of the separator by welding it on-site according to the installation position of the remaining formwork 1. This requires measuring the required length of the separator and then performing separate welding work, which results in poor workability and low work efficiency. Furthermore, welding the joints requires workers with highly specialized welding skills, which not only increases costs but also necessitates strict safety management, such as the management of firearms.

JP 2014-189978 A

The present invention was devised in consideration of the above problems, and its purpose is to provide a length adjustment tool that is easy to install and allows anyone to easily adjust the length in a short time.

The length adjustment jig described in claim 1 is a length adjustment jig that holds the spaced state of plate-shaped panel materials so that the length can be freely adjusted, and is characterized in that it comprises a pair of bolt materials having threaded portions, and a clamping mechanism that overlaps the threaded portions of the pair of bolt materials in a shape that inverts the direction of engagement with the threads and holds them rotatably, and that the length can be fine-tuned by rotating either one of the pair of bolt materials.

The length adjustment jig described in claim 2 is a length adjustment jig for hanging a plate-shaped panel material so that the length can be adjusted freely, and is characterized in that it comprises a pair of hook bolts having connecting hooks and threaded portions for hanging the panel material, and a clamping mechanism for overlapping the threaded portions of the pair of hook bolts in a shape that inverts the direction of engagement with the threads and holding them rotatably, and that the length can be fine-tuned by rotating either one of the pair of hook bolts.

The length adjustment jig described in claim 3 is the length adjustment jig described in claim 2, characterized in that the clamp mechanism has a pair of clamp members that are bent from a plate material and have a notch at the end through which the threaded portion is inserted, and the pair of clamp members are fastened with a connecting bolt to hold the threaded portions rotatably together.

The length adjustment jig described in claim 4 is the length adjustment jig described in claim 3, characterized in that the clamp mechanism holds the threaded portions rotatably together by inserting the corners of the end faces of the notches into the grooves of the threaded portions.

The length adjustment jig described in claim 5 is the length adjustment jig described in claim 3 or 4, characterized in that the recess of one or both of the pair of clamp members is formed with a return piece that hooks the bolt material or the hook bolt to prevent it from falling.

The length adjustment jig described in claim 6 is the length adjustment jig described in claim 2 , characterized in that one or both of the pair of hook bolts has a portion of the connecting hook or the threaded portion crushed to expand its diameter.

The length adjustment jig described in claim 7 is a length adjustment jig described in any one of claims 1 to 6, characterized in that it maintains the separation state of the remaining formwork covering the retaining wall in a freely adjustable length.

According to the invention of claim 1, the length can be finely adjusted by rotating one of the pair of bolt materials, which makes it easy to install and allows anyone to easily adjust the length in a short time. In addition, according to the invention of claim 1, by reversing the direction of engagement with the left and right threads in the longitudinal direction of the bolt, it is possible to ensure shear resistance to the bolt in both pushing and pulling directions, and the structure has no direction in the bolt extraction direction. This provides high durability against repeated loads and vibrations.

According to the invention of claim 2, the length can be finely adjusted by rotating one of the pair of hook bolts, which makes it easy to install and allows anyone to easily adjust the length in a short time. In addition, according to the invention of claim 2, by reversing the direction of engagement with the left and right threads in the longitudinal direction of the bolt, it is possible to ensure shear resistance to the bolt in both pushing and pulling directions, and the structure has no direction in the bolt extraction direction. This provides high durability against repeated loads and vibrations.

In particular, the invention according to claim 3 makes it possible to realize a length adjustment jig with a simple and easy-to-install structure, which is inexpensive and has excellent durability.

In particular, according to the invention of claim 4, the corners of the end faces of the notches are inserted into the grooves of the threaded parts to hold the threaded parts rotatably together, which prevents the hook bolt and bolt material from shifting in the axial direction and allows the hook bolt and bolt material to withstand the pull-out force and compression force along the axial direction.

In particular, according to the invention of claim 5, the notch is formed with a return piece, which reduces the risk of the hook bolt or bolt material falling off the clamp mechanism 52 even when adjusting the length.

In particular, according to the invention of claim 6, a part of the connecting hook or the threaded portion is crushed and expanded in diameter, so that even if a pressing force acts in the axial direction of the hook bolt or the bolt material, there is little risk of it coming loose and coming off.

In particular, according to the invention of claim 7, the distance between the remaining formwork covering the retaining wall is maintained in a freely adjustable length, so that the above-mentioned effect can be achieved in the remaining formwork covering the retaining wall.

FIG. 1 is a vertical sectional view showing a mounting structure for a wall panel in which a wall panel is mounted using a length adjusting jig according to a first embodiment of the present invention. FIG. 2 is an enlarged view of a portion A in FIG. 1, showing the mounting structure of each wall panel. FIG. 3 is a diagram showing a wall panel of the mounting structure for the wall panel according to this embodiment, where (a) is a front view and (b) is a right side view. FIG. 4 is a diagram showing the wall panel of the same, (a) being a rear view, and (b) being a plan view. FIG. 5 is a diagram showing a frame fixing clamp of the wall panel mounting structure according to this embodiment, where (a) is a front view and (b) is a plan view. FIG. 6 is a right side view showing the frame fixing clamp. FIG. 7 is a diagram showing a length adjusting jig according to the first embodiment of the present invention, where (a) is a front view and (b) is a plan view. FIG. 8 is a right side view showing the length adjusting jig. FIG. 9 is a partially enlarged view of FIG. 2 showing an enlarged view of the vicinity of the frame fixing clamp of the wall panel mounting structure according to this embodiment. FIG. 10 is a right side view showing a length adjusting jig according to the second embodiment of the present invention.

The length adjustment jig according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[First embodiment]
A length adjustment jig 5 according to a first embodiment of the present invention will be described with reference to Figures 1 to 9. A case will be described in which a wall panel 3 is attached to a steel frame 2 that maintains the slope shape of the soil S of a reinforced soil wall while adjusting the distance between the steel frame 2 and the steel frame 2, using the length adjustment jig 5 according to the first embodiment. Figure 1 is a vertical cross-sectional view showing a wall panel mounting structure 1 to which a wall panel 3 is mounted using the length adjustment jig 5 according to the first embodiment of the present invention, and Figure 2 is an enlarged view of part A in Figure 1 showing the mounting structure of each wall panel in an enlarged manner.

As shown in Figures 1 and 2, a frame fixing clamp 4 is attached to a steel frame 2 made of expanded metal or welded wire mesh, and a length adjustment jig 5 is hung on the attached frame fixing clamp 4 to adjust the distance between the steel frame 2 and the wall panel 3 while attaching the wall panel 3, thereby constructing a wall panel mounting structure 1.

<Wall panel>
Next, the wall panel 3 of the mounting structure 1 for a wall panel mounted using the length adjustment jig 5 according to this embodiment will be described with reference to Figures 3 and 4. Figure 3 shows the wall panel 3 of the mounting structure 1 for a wall panel according to this embodiment, where (a) is a front view and (b) is a right side view. Also, Figure 4 shows the wall panel 3, where (a) is a back view and (b) is a plan view. Note that the front (surface) refers to the surface seen toward the slope of the retaining wall of the reinforced earth wall (the same applies below).

As shown in FIG. 3, the wall panel 3 is a rectangular panel when viewed from the front, which is installed to cover the front of a retaining wall such as a reinforced earth wall held by a steel frame 2 for weed control and to improve the appearance, and also functions as a residual formwork when backfill concrete is poured on the back side. However, in principle, there is no need to pour backfill concrete for the wall panel mounting structure 1 according to this embodiment.

The wall panel 3 according to this embodiment is a precast lightweight panel in which steel wires are embedded as tensile reinforcement in a cement-based time-hardening material such as lightweight mortar, and is formed into a rectangular shape with a width W1 of 800 mm and a height H1 of 400 mm, as shown in FIG. 3. The surface of this wall panel 3 that can be seen from the front is formed with an imitation rock pattern (not shown) that resembles a stone wall, and the back surface that serves as the rear surface is formed flat. Of course, the dimensions of the wall panel 3 are merely examples, and it goes without saying that they can be appropriately set to a width of 900 mm and a height of 300 mm, a half-split type width of 400 mm and a height of 400 mm, or a width of 450 mm and a height of 300 mm, etc.

The material of the wall panel 3 is not limited to a cement-based time-hardening material, but may be other materials such as resin. However, it is preferable that the wall panel 3 is a lightweight panel that is light enough for a worker to carry it alone. This is because lifting equipment such as a crane or a chain block is not required.

As shown in Figures 3 and 4, the wall panel 3 is composed of a panel body 30 made of a cement-based time-hardening material with a trapezoidal vertical and horizontal cross section, six guide runners 31 (three pairs on each side) protruding from the back surface of the panel body 30 toward the steel frame 2, and four panel hooks 32 (two pairs on the left and right sides in two rows, one above the other) that are hooked by a length adjustment jig 5.

(Guide Runner)
The guide runners 31 are U-shaped hooks made of steel wire for hooking the wall panels 3 together. When an upper wall panel 3 is placed on the lower wall panel 3 hooked by the length adjustment jig 5, the guide runners 31 of the other wall panels 3 are hooked on the other wall panels 3, so that the placed wall panel 3 stands on its own. In this way, the placed wall panel 3 stands on its own, so that the task of hooking the length adjustment jig 5 to the panel hook 32 becomes extremely easy even for a single worker.

As shown in Figures 3(a), 4(a), and 4(b), the guide runners 31 provided on the upper part of the panel body 30 and the guide runners 31 provided on the lower part of the panel body 30 are offset to the left and right so as not to interfere with the guide runners 31 of other wall panels 3 on the adjacent upper and lower levels.

(Panel hook)
The panel hook 32 is a dogleg-shaped hook made of a steel wire for hanging the wall panel 3 with the length adjustment jig 5, and as shown in Fig. 3(b) , a loop portion 32a is formed by turning the steel wire once in the middle. By hanging the connecting hook of the length adjustment jig 5 on this loop portion 32a, it is possible to reduce the risk of the connecting hook 51a (described later) coming off the loop portion 32a and becoming detached even if the steel frame 2 expands and a pressing force acts on the wall panel 3 from the back side (see also Fig. 2 ).

<Frame fixing clamp>
Next, the frame fixing clamp 4 of the wall panel mounting structure 1 according to this embodiment will be described with reference to Fig. 5 and Fig. 6. Fig. 5 shows the frame fixing clamp 4 of the wall panel mounting structure 1 according to this embodiment, (a) being a front view and (b) being a plan view. Fig. 6 is a right side view showing the frame fixing clamp 4 of the wall panel mounting structure 1.

As shown in Figures 5 and 6, the frame fixing clamp 4 is a clamp for fixing the wall panel 3 to the steel frame 2 via the length adjustment jig 5. This frame fixing clamp 4 includes a clamp body 40, a hook bolt 41 screwed to the clamp body 40, and a stainless steel abutment plate 42 joined to the clamp body 40.

(Clamp body)
The clamp body 40 is a member formed by cutting and bending a stainless steel plate having a thickness of about 3 mm. As shown in Figures 5 and 6, the clamp body 40 is formed with a hook piece 43 for hooking the connecting hook 50a of the length adjustment jig 5, and with a recessed groove 44 for inserting the frame material constituting the expanded metal of the steel frame 2. A bolt hole (not shown) for inserting the hook bolt 41 is drilled near the center of the clamp body 40.

The hook piece 43 is formed with a hook hole 43a, which is a circular hole with a diameter of 8 mm, through which the connecting hook 50a of the length adjustment jig 5 can be inserted. Of course, the diameter of the hook hole 43a can be determined appropriately according to the diameter of the connecting hook. However, as described below, in order to prevent the length adjustment jig 5 from falling, a part of the connecting hook 50a is crushed and expanded in diameter, so it is preferable that the diameter of the hook hole 43a is not much larger than that of the connecting hook 50a.

As shown in FIG. 6, the groove 44 has a tapered side that is wider at the bottom end facing the steel frame 2 and narrower at the top end facing the rear.

(Hook bolt)
The hook bolt 41 is a stainless steel bolt, and is composed of a J-hook 41a with a J-shaped bent tip, a threaded portion 41b with an M8 thread, and a stainless steel nut 41c of M8 that screws into the threaded portion 41b. Of course, M8 is merely an example of the thread diameter, and it goes without saying that it can be selected appropriately depending on the size (same below).

(Contact plate)
The abutment plate 42 is a stainless steel plate with a thickness of about 3 mm, and like the clamp body 40, has a bolt hole (not shown) drilled in the center for inserting the hook bolt 41. This abutment plate 42 has a length that ensures that both ends of the abutment plate 42 abut other parts of the frame material of the steel frame 2 when the abutment plate 42 is hooked to the frame material of the steel frame 2 by the hook bolt 41 inserted through the central bolt hole. In the illustrated embodiment, the length of the abutment plate 42 is 80 mm, and by ensuring a length of 40 mm to both ends of the abutment plate 42 when the center is hooked by the hook bolt 41, it is ensured that the abutment plate 42 contacts the frame material of the expanded metal at three or more points (see also FIG. 9).

Of course, the length of this abutment plate 42 is set appropriately depending on the gap spacing and placement position of the frame materials of the steel frame 2, and in the case of a steel frame 2 made of welded wire mesh, it is preferable for the length to be at least twice the spacing of the welded wire mesh that is the frame material.

The abutment plate 42 is welded to the clamp body 40. However, the abutment plate 42 only needs to be long enough to contact the frame material at three or more points, and may be molded integrally with the clamp body 40. In that case, the aforementioned hook piece 43 may be attached by welding to the clamp body 40 that is integrated with the abutment plate 42.

In this way, the frame fixing clamp 4 presses the groove 44 against the frame material of the steel frame 2, hooks the J-hook 41a of the hook bolt 41 onto the frame material of the steel frame 2, and tightens it with the nut 41c, so that the frame material of the steel frame 2 is guided to a fixed position at the back of the groove 44 and securely hooked and fixed.

<Length adjustment jig>
Next, the length adjustment jig 5 according to the first embodiment of the present invention will be described with reference to Fig. 2 and Figs. 7 to 9. Fig. 7 shows the length adjustment jig 5 of the wall panel mounting structure 1, with (a) being a front view and (b) being a plan view. Fig. 8 is a right side view showing the length adjustment jig 5. Fig. 9 is a partially enlarged view of Fig. 2 showing the vicinity of the frame fixing clamp 4 of the wall panel mounting structure 1. As shown in Fig. 2 and other figures, the length adjustment jig 5 according to the first embodiment is a jig that connects the hook piece 43 of the frame fixing clamp 4 and the panel hook 32 of the wall panel 3 in a length-adjustable manner. This length adjustment jig 5 includes a pair of hook bolts 50, 51 and a clamp mechanism 52 that rotatably holds the pair of hook bolts 50, 51, and allows fine adjustment of the length by rotating either one or both of the pair of hook bolts 50, 51.

(Hook bolt)
As shown in Figures 2 and 7, the hook bolt 50 is a stainless steel hanging fitting that is hung in the hanging hole 43a of the hanging piece 43, and has a connecting hook 50a that is bent back by 180 degrees or more, and a threaded portion 50b that is continuous with this connecting hook 50a and has an M8 thread formed thereon.

After the hook bolt 50 is hooked into the hook hole 43a, the area near the boundary between the connecting hook 50a and the threaded portion 50b is crimped and crushed to form a crushed portion 50c with an expanded diameter. This prevents the hook bolt 50 from coming loose from the hook hole 43a even if a pressing force acts in the axial direction of the hook bolt 50 (see Figures 2 and 9).

As shown in Figures 2 and 7, the hook bolt 51 is a stainless steel fastening fitting that is hooked onto the panel hook 32 of the wall panel 3, and has a connecting hook 51a that is bent back at approximately 170 degrees, and a threaded portion 50b that is continuous with the connecting hook 50a and has an M8 thread.

(Clamping mechanism)
The clamp mechanism 52 is a mechanism that latches the threaded portions 50b, 51b of the pair of hook bolts 50, 51 to resist stress along the axial direction of the hook bolts 50, 51, and also overlaps the hook bolts 50, 51 to adjust their length and rotatably hold them. As shown in Figures 7 and 8, the clamp mechanism 52 is composed of a first clamp member 53 with a U-shaped cross section whose open end is open, a second clamp member 54 with a U-shaped cross section whose open end is fitted into the first clamp member 53, and a connecting bolt 55 that passes through and holds them.

In the illustrated embodiment, the first clamping material 53 is a stainless steel plate about 3 mm thick, with both ends bent upward in the out-of-plane direction, and a notch 53a is formed through which the pair of hook bolts 50, 51 are inserted. The inner end surface 53b of this notch 53a has a predetermined inclination angle so that the cut end surface screws into the threaded portion 51b, and the corners of this inner end surface 53b fit into the thread groove of the threaded portion 51b, thereby preventing the hook bolt 51 from shifting in the axial direction against the stress along the axial direction of the hook bolt 51.

In addition, as shown in FIG. 7(a), a return piece 53c is formed in the notch 53a of the first clamping material 53, which reduces the risk of the hook bolt 51 falling off the clamping mechanism 52 even when fine-tuning the length.

Like the first clamp material 53, the second clamp material 54 is made of a stainless steel plate about 3 mm thick, with both ends bent downward out of the plane, and has an arc-shaped notch 54a through which only the hook bolt 50 is inserted. The inner end surface 54b of this notch 54a has a predetermined inclination angle that allows the cut end surface to screw into the threaded portion 50b, and this inner end surface 54b fits into the thread groove of the threaded portion 51b, thereby preventing the hook bolt 51 from shifting in the axial direction against the stress along the axial direction of the hook bolt 51.

In addition, the hook bolts 50 and 51 are shaped so that the direction of engagement with the left and right threads is reversed along the length of the bolt, ensuring shear resistance in both pushing and pulling directions, and are structured so that there is no direction in the bolt extraction direction. This gives the clamp mechanism 52 high durability against repeated loads and vibrations.

The connecting bolt 55 is an M8 size bolt that is inserted into a bolt hole (not shown) drilled in the center of the first clamping material 53 and the second clamping material 54. The connecting bolt 55 is screwed with a nut 55b via a washer 55a, so that the hook bolts 50, 51 are sandwiched between the first clamping material 53 and the second clamping material 54. Therefore, the clamping mechanism 52 holds the hook bolts 50, 51 in a state where the threads of the threaded parts 50b, 51b of the hook bolts 50, 51 are hooked together, and can resist the pull-out force and compression force along the axial direction of the hook bolts 50, 51. In other words, the resistance to the pull-out load due to the engagement of the threads is secured by the shear force, resulting in a strong restraint structure that is different from general simple slip resistance. In addition, it is a stable structure that is not easily affected by vibrations, etc.

[How to use the length adjustment tool]
Next, a method of using the length adjustment jig 5 according to the first embodiment of the present invention will be described with reference to Figures 1, 2 and 9. The following describes an example of a case in which a sloped reinforced soil wall is constructed, and wall surface greening is not performed, but the wall surface mounting structure 1 is constructed by attaching a wall panel 3 covering the front surface of a steel frame 2 that maintains the slope shape of the soil S of the reinforced soil wall, for the purpose of weed control and landscape improvement.

(Preliminary process)
First, as shown in FIG. 1, a reinforced earth wall is constructed by laying earth S made of local soil or fill on a steel frame 2 made of expanded metal or welded wire mesh.

Specifically, as shown in Figure 1, soil S is laid to create a slope with a trapezoidal vertical cross section, which is then appropriately compacted, and geotextile G, a planar resistance material, is laid. The aforementioned steel frame 2 is installed along the edge of the slope to connect with the laid geotextile G. In this process, these steps are repeated to interpose geotextile G within the soil S that has been laid in layers, and the strength of the soil is increased and the entire embankment is stabilized through the tensile resistance of geotextile G, friction and interlocking with the soil S, and promotion of consolidation of the embankment, thereby constructing a reinforced soil wall, which is a steeply sloping soil wall structure.

(Frame fixing clamp installation process)
Next, in the method of using the length adjusting jig according to this embodiment, a frame fixing clamp attachment step is performed in which the frame fixing clamp 4 is fixed to the steel frame 2 installed in the preliminary step.

Specifically, as shown in Figures 2 and 9, in this process, the groove 44 of the frame fixing clamp 4 is pressed against the frame material of the steel frame 2 made of expanded metal, and the frame material of the steel frame 2 is hooked with a J-shaped hook 41a with a J-shaped bent tip, and the nut 41c is turned and screwed in place. At this time, as shown in Figure 6, the groove 44 has a tapered side that is wide at the bottom end shown in the figure that is the steel frame 2 side and narrow at the top end that is the back side. Therefore, when the hook bolt 41 is tightened, the frame fixing clamp 4 is fixed in an appropriate fixed position where the frame material of the steel frame 2 is guided by the tapered side of the groove 44 and abuts against the bottom side of the groove 44.

As described above, the frame fixing clamp 4 is provided with a contact plate 42 having a predetermined length according to the frame material spacing of the steel frame 2 made of expanded metal. Therefore, as shown in Figures 2 and 9, when the frame fixing clamp 4 is hooked at the center by the hook bolt 41, both ends of the contact plate 42 abut against other frame materials of the expanded metal. Therefore, the frame fixing clamp 4 contacts the steel frame 2 at three or more points, and has a reaction point for each of the left and right rotation directions, and the frame fixing clamp 4 can be prevented from rotating around the frame material hooked by the hook bolt 41. This configuration makes it possible to prevent the length adjustment jig 5 from falling off the hook piece 43 of the frame fixing clamp 4 in the wall panel installation process, which is a later process. This configuration also dramatically improves the fixing force of the frame fixing clamp 4 against repeated external forces and vibrations.

(Wall panel installation process)
Next, in a method of using the length adjustment jig according to this embodiment, the length adjustment jig 5 is hung on the frame fixing clamp 4 installed in the front frame fixing clamp installation process, and the wall panel installation process is performed to install the aforementioned wall panel 3.

Specifically, as shown in FIG. 2, in this process, the connecting hook 50a of the hook bolt 50 of the length adjustment jig 5 is inserted and hooked into the hook hole 43a of the hook piece 43 of the frame fixing clamp 4 installed in the front frame fixing clamp installation process. After that, the vicinity of the boundary between the connecting hook 50a and the threaded portion 50b is crimped and crushed to form the expanded crushed portion 50c (see also FIG. 12). However, the process of forming the crushed portion 50c may be performed before the frame fixing clamp installation process, and the frame fixing clamp installation process may be performed with the length adjustment jig 5 connected to the frame fixing clamp 4. This is because there is less work to be done on the back side of the wall panel 3, which is difficult for workers to see, and work efficiency is improved.

In this process, the pair of hook bolts 50, 51 are overlapped to the required length according to the deformation of the retaining frame 2, such as the protrusion, and clamped and held by the clamp mechanism 52, and the hook bolt 51 is hooked to the panel hook 32 of the wall panel 3. After that, the length of the connector 5 is finely adjusted by rotating one or both of the pair of hook bolts 50, 51 while clamped by the clamp mechanism 52. At this time, the length of the connector 5 can be finely adjusted by simply turning the hook bolts 50, 51 with one hand, so that the worker can support the wall panel 3 with one hand while accurately adjusting the length of the connector 5 with the other hand, resulting in extremely good work efficiency. Furthermore, the length adjustment of the connector 5 depends on the position of the hook bolts 50, 51 at which the clamp mechanism 52 clamps them, so an extremely wide range of adjustment is possible, and it is also possible to freely set the gradient angle, such as changing the gradient of the reinforced earth wall and the gradient of the wall panel 3. In addition, the main length adjustment work involves simply overlapping a pair of hook bolts 50, 51 and clamping and holding them with the clamp mechanism 52, allowing for large length adjustments in a short time, while also allowing for precise fine adjustments by simply rotating either of the hook bolts 50, 51.

In addition, in this process, the length of the length adjustment jig 5 is adjusted again to fine-tune the protruding and retracting features of the corners of adjacent wall panels 3, ensuring the smoothness of the wall panels 3. As mentioned above, the length of the length adjustment jig 5 can be fine-tuned by simply turning it with one hand, which significantly improves work efficiency compared to conventional wall panel installation work.

When installing the bottom wall panel 3, as shown in Figure 1, concrete is poured to construct the foundation F, and the hanging member L, which is an L-shaped angle, is fixed with the anchor A1. The guide runner 31 below the wall panel 3 is then hung on this hanging member L to install it.

As mentioned above, in the conventional method of directly fixing wall panels to a steel frame, the embankment and steel frame would bulge outward and deform due to compaction, etc., and this deformation could be transmitted to the wall panel, causing it to collapse. Furthermore, there were concerns about long-term durability in an environment where rainwater could seep into the bolts, etc.

However, in the length adjustment jig 5 according to this embodiment, not only is the connecting hook 50a of the hook bolt 50 bent back by 180 degrees or more, but a crushing portion 50c is also formed to prevent it from coming off due to repeated external forces or vibrations. In addition, the frame fixing clamp 4 and the length adjustment jig 5 are made of stainless steel, and there is no problem with long-term durability even in an environment where rainwater penetrates.

In addition, a return piece 53c is formed in the notch 53a of the length adjustment jig 5, which prevents the hook bolt 51 from falling out of the clamp mechanism 52 and into the lower wall panel 3 or onto the foundation F even when adjusting the length of the length adjustment jig 5 in this process.

Meanwhile, the connecting hook 51a of the hook bolt 51 of the length adjustment jig 5 that is hooked onto the panel hook 32 of the wall panel 3 is bent back by about 170 degrees, making it easier to hook onto the panel hook 32 when working on the back of the wall panel 3, and less likely to come off even if a pressing force is applied. In addition, the panel hook 32 has a loop portion 32a formed by turning the steel wire once in the middle, so that even if the steel frame 2 is filled and a pressing force is applied to the wall panel 3 from the back, the risk of the connecting hook 51a coming off the loop portion 32a and becoming detached can be reduced.

In this process, the wall panel 3 is installed, and the back side of the panel may be filled with a filler such as crushed stone (e.g., single-grain crushed stone). This is because constructing a crushed stone layer with drainage function not only protects the reinforced earth wall, but also ensures impact resistance against collisions with driftwood and rocks.

According to the length adjustment jig 5 of the first embodiment of the present invention described above, the pair of hook bolts 50, 51 are overlapped to the required length, clamped and held by the clamp mechanism 52, and the length can be finely adjusted by rotating one of the pair of hook bolts, so that the workability is good and anyone can easily adjust the length in a short time. In addition, according to the length adjustment jig 5 of the first embodiment, by making the biting direction of the left and right threads of the bolt inverted in the longitudinal direction, shear resistance force against the bolt in both pushing and pulling directions can be secured, and the structure has no direction in the bolt extraction direction. Therefore, it has high durability against repeated loads and vibrations.

In addition, according to the length adjustment jig 5 of the first embodiment, the wall panel 3 can be easily and quickly joined to the steel frame 2 by mechanical dry joining without welding. This solves the problem of being unable to weld to the steel frame, which is the structural material of the reinforced earth wall, due to cross-sectional defects, and also eliminates the preparation process of installing the pillar material in front of the reinforced earth wall, making it possible to shorten the construction period for installing the wall panel 3 and constructing the reinforced earth wall. Furthermore, since no welding is performed, there is no need to manage or inspect flammables and firearms, which not only reduces the risk of industrial accidents, but also makes the construction period unaffected by weather, and does not require welding workers, making it easy to secure personnel. In addition, since the wall panel 3 is installed by directly attaching the frame fixing clamp 4 to the steel frame 2, there is a high degree of freedom in the arrangement of the wall panel 3, such as staggered arrangement or random stacking arrangement, and it is easy to plan and manage the construction, reducing the burden on the construction manager.

In addition, the length adjustment jig 5 according to the first embodiment eliminates the need to pour backfill concrete, making it possible to omit the work involved in pouring concrete, which also shortens the construction period.

Furthermore, with the length adjustment jig 5 according to the first embodiment, instead of the conventional installation of weed control sheets within a steel frame, a lightweight wall panel 3 is installed using dry joining, making it easy to dismantle, remove, replace, or repair the wall panel 3, reducing running costs. Also, since the wall panel 3 is installed by attaching the frame fixing clamps 4 directly to the steel frame 2, there is a high degree of freedom in installing the wall panels, such as in a staggered or random stacking arrangement, which makes it easy to plan and manage the construction, reducing the burden on the construction manager.

In addition, according to the length adjustment jig 5 of the first embodiment, the length of the length adjustment jig 5 can be freely adjusted, so it is easy to install the wall panel 3 according to the degree of deformation, such as the protrusion of the steel frame 2 caused by the compaction of soil such as embankments. Also, the length adjustment margin of the length adjustment jig 5 is large, so not only is it easy to follow the deformation of the steel frame 2, but it is also possible to freely set the gradient angle, such as making the gradient of the reinforced soil wall and the gradient of the wall panel 3 different.

Furthermore, according to the length adjustment jig 5 of the first embodiment, the connection between the length adjustment jig 5 and the steel frame 2 via the frame fixing clamp 4, which is fixed non-rotatably with three points of contact, is a semi-fixed pin joint with a moderate amount of play, so it can withstand compressive forces caused by earthquakes, bulging, etc., and can follow the deformation of the steel frame 2 over time after installation to prevent the collapse of the wall panel 3.

[Second embodiment]
Next, a length adjustment jig 5' according to a second embodiment of the present invention will be described with reference to Fig. 10. The only difference from the length adjustment jig 5 according to the first embodiment described above is that the connecting hooks 50a, 51a of the hook bolts 50, 51 are not present, and bolt materials 50', 51' are made of fully threaded bolts. Therefore, this point will be described, and the same components will be given the same reference numerals and descriptions thereof will be omitted.

The length adjustment jig 5' according to the second embodiment of the present invention comprises a pair of bolt materials 50', 51' made of fully threaded bolts, and a clamp mechanism 52 that rotatably holds the threaded portions 50a', 51a' of the pair of bolt materials 50', 51' together, and allows fine adjustment of the length by rotating either one or both of the pair of bolt materials 50', 51'.

This length adjustment jig 5' is used to hold a constant distance between plate-shaped panel materials such as wooden formwork. This length adjustment jig 5' clamps the panel materials with nuts that screw into the ends of bolt materials 50', 51', which are fully threaded bolts, and holds the panel materials apart. The length adjustment jig 5' can also be used to hold the plate-shaped panel materials apart from other structures. For example, the length adjustment jig 5' can be suitably applied to keep a constant distance between the retaining wall and the remaining formwork that covers it. Here, the retaining wall refers to general retaining walls such as masonry retaining walls, leaning retaining walls, gravity retaining walls, and L-shaped retaining walls.

The length adjustment jig 5' according to the second embodiment can also be used to adjust the spacing of plate-shaped panel materials without hooks, achieving the above-mentioned effects.

The length adjustment jig 5 according to the first embodiment of the present invention and the length adjustment jig 5' according to the second embodiment of the present invention have been described in detail above, but the above-mentioned and illustrated embodiments are merely examples of embodiments of the present invention. Therefore, the technical scope of the present invention should not be interpreted in a limited manner. In particular, the materials, dimensions, size, diameter, etc. of each component shown as an embodiment of the present invention are merely examples, and it goes without saying that they can be changed as appropriate.

1: Wall panel mounting structure 2: Steel frame 3: Wall panel 30: Panel body 31: Guide runner 32: Panel hook 32a: Loop portion 4: Frame fixing clamp 40: Clamp body 41: Hook bolt 41a: J-hook 41b: Screw portion 42: Contact plate 43: Hook piece 43a: Hook hole 44: Groove 5, 5': Length adjustment jig 50, 51: Hook bolt 50', 51': Bolt material 50a, 51a: Connecting hook 50b, 51b, 50a', 51a': Screw portion 50c: Crushing portion 52: Clamp mechanism 53: First clamp material (clamp material)
53a: Recess 53b: Inner end surface (end surface)
53c: Return piece 54: Second clamping material (clamping material)
54a: Recess 54b: Inner end surface (end surface)
55: Connecting bolt 55a: Washer 55b: Nut S: Soil G: Geotextile (sheet-shaped resistance material)
F: Foundation L: Hanging material A1: Anchor

Claims (7)

A length adjustment jig that holds the plate-shaped panel materials in a spaced state so that the length can be freely adjusted,
A pair of bolt materials having threaded portions, and a clamping mechanism that overlaps the threaded portions of the pair of bolt materials with each other in a shape in which the engagement direction with the threads is reversed and rotatably holds them,
A length adjustment jig characterized in that the length can be finely adjusted by rotating one of the pair of bolt materials. A length adjustment jig for hanging and fastening a plate-shaped panel material so that the length of the panel material can be freely adjusted,
a pair of hook bolts having a connecting hook and a threaded portion for hanging the panel material; and a clamp mechanism for overlapping the threaded portions of the pair of hook bolts with each other in a shape with the direction of engagement with the threads reversed so as to rotatably hold the hook bolts;
A length adjustment jig characterized in that the length can be finely adjusted by rotating either one of the pair of hook bolts. The length adjustment jig described in claim 2, characterized in that the clamp mechanism has a pair of clamping materials that are bent from a plate material and have a notch at the end through which the screw portion is inserted, and the pair of clamping materials are fastened together with a connecting bolt to hold the screw portions together in a rotatable manner. 4. The length adjusting jig according to claim 3, wherein the clamp mechanism holds the threaded portions rotatably relative to each other by inserting a corner of an end face of the notch into a groove of the threaded portion. The length adjustment jig according to claim 3 or 4, characterized in that a return piece is formed in the notch of one or both of the pair of clamp members to hook the bolt material or the hook bolt so as to prevent it from falling. The length adjustment jig according to claim 2 , wherein one or both of the pair of hook bolts is expanded in diameter by crushing a part of the connecting hook or the threaded portion. 7. A length adjustment jig as claimed in claim 1, which maintains the separation state of the remaining formwork covering the retaining wall in a freely adjustable length.

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