Scaffolding structure for retaining wall construction, stepped member with scaffolding bracket, and method for assembling scaffolding.

Abstract

To enable efficient work in a simple, inexpensive, and safe manner, even when there are significant height differences between wall blocks. [Solution] The system comprises first scaffolding brackets 4a and 4b having scaffolding support parts, and a second scaffolding bracket 5 having a frame and an intermediate rod interposed horizontally within the frame. The first scaffolding brackets 4a and 4b are attached to predetermined positions on the wall surface, excluding the vicinity of the stepped portion 3a of the upper side wall block 2b, and the second scaffolding bracket 5b is attached to a predetermined position on the wall surface near the stepped portion 3a of the upper side wall block 2b. The upper side scaffolding board 6b is supported by the scaffolding support parts and the upper frame portion of the frame, and the lower side scaffolding board 6a is supported by the lower frame portion of the frame and the scaffolding support parts. A stepped member 18 is provided near the stepped portion 3a of the upper side wall block 2b, with one end hooked onto the intermediate rod and the other end in contact with the lower side scaffolding board 6b.

Description

Technical Field

[0005] , ,

[0006]

[0001] The present invention relates to a scaffolding structure for retaining wall work, a stepped member with a scaffolding bracket, and a method for assembling a scaffolding, and more particularly to a scaffolding structure for retaining wall work constructed when forming a retaining wall having a gradient in the longitudinal direction using precast concrete members, a stepped member with a scaffolding bracket suitable for this scaffolding structure, and a method for assembling a scaffolding for constructing the above scaffolding structure.

Background Art

[0002] Conventionally, when assembling a wall surface body by stacking precast concrete members and forming a retaining wall on a slope of embankment or the like, reinforcing materials such as geotextiles, steel strips, and anchors are laid in multiple layers in the embankment, and the concrete members and the reinforcing materials are connected to reinforce the embankment.

[0003] And in this type of reinforced earth retaining wall method, since work is carried out by constructing a scaffolding on the front surface of the wall surface body, technologies related to the scaffolding structure have also been actively proposed.

[0004] For example, Patent Document 1 proposes a scaffolding structure for constructing a temporary scaffolding on the front surface of a wall material (wall surface body) for constructing a reinforced earth retaining wall, which includes an installation jig configured to be freely exposed forward of the wall material and a temporary scaffolding having a connection mechanism with the installation jig.

[0005] Also, Patent Document 1 describes that the above-mentioned installation jig has a sliding portion that penetrates the wall material and is movable back and forth on the front and back surfaces, and an elastic portion provided on the back side of the wall material that biases the sliding portion in the back direction, and a connection function of the temporary scaffolding is provided at the tip of the sliding portion.

[0006] This Patent Document 1 describes how, by providing the aforementioned installation jig to a temporary scaffolding equipped with brackets and scaffolding boards, and connecting the installation jig to a connecting plate, the locking state can be released simply by pulling the scaffolding up from above, and the installation jig can be returned to its initial state. As a result, workers do not need to be directly involved in the removal of the scaffolding, and the installation and removal of the temporary scaffolding can be carried out efficiently, thereby ensuring the safety of the work. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2013-217041 (Claim 1-5, paragraph

[0007] , Figures 1-3, etc.) [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Incidentally, when forming a retaining wall with a longitudinal slope using precast concrete members, in order to ensure the flatness of the work path, wall blocks with flat tops are arranged in a stepped manner, and then cap concrete is poured on top to form the retaining wall.

[0009] Because the wall blocks are arranged in a stepped pattern, a step is formed between each wall block, that is, between the upper wall block and the lower wall block. Consequently, a step is also formed in the scaffolding constructed in front of the wall blocks.

[0010] However, in conventional technologies such as those described in Patent Document 1, although the scaffolding boards are supported by brackets, if a step is formed between wall blocks, it may not be possible to move smoothly from the upper wall block to the lower wall block, which could lead to a decrease in work safety and work efficiency.

[0011] In other words, geotextile-reinforced earth wall construction and steel-strip reinforced earth wall construction are widely known as representative examples of this type of retaining wall construction. However, the size of the concrete members is standardized, and for example, the height dimensions are large, ranging from 400mm to 900mm for concrete members used in geotextile-reinforced earth wall construction and from 750mm to 1500mm for concrete members used in steel-strip reinforced earth wall construction. When forming a retaining wall with a slope in the longitudinal direction, a large difference in height is created between the wall body blocks. Therefore, when moving from the upper side wall body block to the lower side wall body block, workers must first descend from the upper scaffolding and move to the lower scaffolding by appropriate means to resume work, which is inferior in terms of safety and work efficiency.

[0012] The present invention has been made in view of these circumstances, and aims to provide a scaffolding structure for retaining wall construction that can be easily and inexpensively constructed, and work can be carried out efficiently without compromising safety, even when large height differences are formed between wall blocks; a staircase-like member with a scaffolding bracket suitable for this scaffolding structure; and a method for assembling scaffolding to construct this scaffolding structure. [Means for solving the problem]

[0013] To achieve the above objective, the scaffolding structure for retaining wall construction according to the present invention is a scaffolding structure to be placed in front of a retaining wall in which wall body blocks made of concrete members with flat top surfaces are connected in a stepped manner via a stepped portion in order to form a retaining wall having a gradient in the longitudinal direction, and comprises a first scaffolding bracket which is substantially triangular in shape and has a scaffolding support portion, and a second scaffolding bracket which has a rectangular or substantially rectangular frame and an intermediate rod which is interposed horizontally within the frame, wherein the wall body block is divided into an upper side wall body block and a lower side wall body block with the stepped portion as the boundary, and the first scaffolding bracket However, the second scaffolding bracket is attached to a predetermined position on the wall surface of the upper side wall block, excluding the vicinity of the stepped portion, the upper scaffolding board is supported by the scaffolding support portion of the first scaffolding bracket and the upper frame portion of the frame, the lower scaffolding board is supported by the lower frame portion of the frame and the scaffolding support portion of the first scaffolding bracket, and a stepped member is provided near the stepped portion of the upper side wall block, with one end hooked onto the intermediate rod and the other end in contact with the lower scaffolding board.

[0014] In this case, it is preferable that the staircase member comprises a base that contacts the lower scaffolding board, a hook fitting that is attached to the intermediate rod, a pair of inclined side plates that connect the hook fitting and the base, and a step portion interposed between the pair of side plates.

[0015] Furthermore, it is preferable that the frame consists of a gate-shaped member having the upper frame portion and the intermediate rod portion, which is connected to a U-shaped member including the lower frame portion.

[0016] Furthermore, it is preferable that the number of steps in the stepped member be set according to the height difference of the stepped portion.

[0017] Furthermore, in the scaffolding structure of the retaining wall construction of the present invention, it is preferable that flat retaining wall fixing fittings are attached in a superimposed manner to each of the first and second scaffolding brackets and inserted into the gaps in the concrete members, and that the first and second scaffolding brackets are each tightly fixed to the wall body block via the retaining wall fixing fittings.

[0018] In this case, it is preferable that the retaining wall fixing fitting has an elongated hole formed in an inclined shape, and that through holes are formed in each of the first and second scaffolding brackets, and that fasteners are inserted through the through holes and the elongated hole and positioned on the wall block side of the elongated hole, thereby fastening the first and second scaffolding brackets to each of the retaining wall fixing fittings.

[0019] Furthermore, the retaining wall can be constructed using the geotextile reinforced earth wall method or the steel strip reinforced earth wall method.

[0020] Furthermore, the staircase-shaped member with a scaffolding bracket according to the present invention comprises a base, a hook fitting, a pair of side plates attached at an inclination to connect the hook fitting and the base, and a step portion interposed between the pair of side plates, wherein the hook fitting is hooked onto the intermediate rod of a scaffolding bracket having a rectangular or substantially rectangular frame and an intermediate rod interposed horizontally within the frame.

[0021] In this case, it is preferable that the frame has an upper frame portion and a lower frame portion, and that a gate-shaped member having the upper frame portion and the intermediate rod is connected to a U-shaped member including the lower frame portion.

[0022] Moreover, the scaffolding assembling method according to the present invention is a scaffolding assembling method constructed on the front surface of the wall body block in a retaining wall work in which wall body blocks having a flat upper surface made of concrete members are continuously arranged in a stepped manner via a stepped portion in order to form a retaining wall having a gradient in the longitudinal direction. The method includes preparing a first scaffolding bracket having a substantially triangular shape with a scaffolding support portion, a second scaffolding bracket having a rectangular or substantially rectangular frame body and an intermediate rod body horizontally interposed within the frame body, and a stepped member. The wall body block is divided into an upper wall body block and a lower wall body block with the stepped portion as a boundary. The first scaffolding bracket is attached to a predetermined position on the wall surface excluding the vicinity of the stepped portion of the upper wall body block, and the second scaffolding bracket is attached to a predetermined position on the wall surface in the vicinity of the stepped portion of the upper wall body block. The upper stage scaffolding board is supported by the scaffolding support portion of the first scaffolding bracket and the upper frame portion of the frame body, and the lower stage scaffolding board is supported by the lower frame portion of the frame body and the scaffolding support portion of the first scaffolding bracket. The stepped member is installed in the vicinity of the stepped portion of the upper wall body block such that one end is hooked on the intermediate rod body and the other end contacts the lower stage scaffolding board.

[0023] In this case, it is preferable to provide a hook fitting at the tip of the stepped member and hook the hook fitting on the support rod.

[0024] Moreover, it is preferable to set the number of steps of the stepped member according to the height difference of the stepped portion.

[0025] Furthermore, in the scaffolding assembling method of the present invention, it is preferable to attach a flat retaining wall fixing fitting in a superimposed manner to each of the first and second scaffolding brackets, insert the retaining wall fixing fitting into the gap of the concrete member, and tightly fix the first and second scaffolding brackets to the wall body block respectively.

[0026] In this case, through holes are formed in each of the first and second scaffolding brackets, and inclined long holes are formed in the retaining wall fixing metal fittings. After the fixing tool is loosely attached to the through holes and the long holes, it is preferable to slide the fixing tool inside the long holes toward the wall body block side to fasten the first and second brackets and the respective retaining wall fixing metal fittings.

Advantages of the Invention

[0027] According to the scaffolding structure and the scaffolding assembling method of the retaining wall work of the present invention, the second scaffolding bracket has a rectangular or substantially rectangular frame body and an intermediate rod body horizontally interposed by the frame body. The upper-stage scaffolding board is supported by the scaffolding support portion of the first scaffolding bracket and the upper frame portion of the frame body, and the lower-stage scaffolding board is supported by the lower frame portion of the frame body and the scaffolding support portion of the first scaffolding bracket. A stepped member is installed near the step portion of the upper-stage wall surface block so that one end is hooked on the intermediate rod body of the second scaffolding bracket and the other end contacts the lower-stage scaffolding board. Therefore, while ensuring the flatness of the work path, the movement from the upper-stage wall surface block to the lower-stage wall surface block or from the lower-stage wall surface block to the upper-stage wall surface block can be smoothly performed. Accordingly, the risk of the worker falling from the step portion can be effectively avoided, the safety of the worker can be improved simply and at low cost, and the workability can be improved.

[0028] Moreover, in addition to the first scaffolding bracket, it is only necessary to attach the above-described second scaffolding bracket to a predetermined position on the wall surface near the step portion via a retaining wall fixing metal fitting and hook the stepped member on the intermediate rod body, and a desired scaffolding structure with a simple structure and good workability and safety can be constructed.

[0029] Furthermore, the staircase member with scaffolding bracket of the present invention comprises a base, a hook fitting, a pair of side plates attached at an inclination to connect the hook fitting and the base, and a step portion interposed between the pair of side plates. The hook fitting is hooked onto the intermediate rod of a scaffolding bracket having a rectangular or substantially rectangular frame and an intermediate rod interposed horizontally within the frame. Therefore, even when a step occurs when stacking precast concrete members to form a wall block, by placing this staircase member with bracket near the step, it becomes possible to form a retaining wall with improved workability and safety, thus providing a staircase member with scaffolding bracket suitable for such a scaffolding structure. [Brief explanation of the drawing]

[0030] [Figure 1] This is a schematic front view showing a first embodiment of the scaffolding structure for retaining wall construction according to the present invention, in which the scaffolding structure is constructed on the front of the wall block. [Figure 2] This is an enlarged view of section A in Figure 1. [Figure 3] This is a plan view of Figure 2. [Figure 4] This is an enlarged view of section B in Figure 2, and is a front view showing the state in which the first scaffolding bracket is attached to the wall block. [Figure 5] This is a right side view of Figure 4, showing the state in which the first scaffolding bracket is tightly fixed to the wall block. [Figure 6] This is an enlarged view of section D in Figure 5. [Figure 7] This diagram illustrates the attachment of the first scaffolding bracket to the concrete member. [Figure 8] This is an enlarged view of section C in Figure 2. [Figure 9] Figure 8 is a left side view showing the assembled state of the staircase-shaped member to the second scaffolding bracket. [Figure 10] This diagram shows the assembly of the second scaffolding bracket to the retaining wall fixing fitting. [Figure 11] This is an assembly drawing of a stepped component. [Figure 12] This is a flowchart showing the construction procedure for the scaffolding assembly method according to the present invention. [Figure 13] This is an enlarged front view of the main part of a second embodiment of the scaffolding structure for retaining wall construction according to the present invention. [Figure 14] This is an assembly drawing of a stepped member according to the second embodiment. [Figure 15] This figure shows the assembled state of the second scaffolding bracket of the staircase-shaped member in the second embodiment. [Modes for carrying out the invention]

[0031] Next, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0032] (First Embodiment) In this first embodiment, a scaffolding structure suitable for the geotextile-reinforced earth wall construction method will be described in detail as an example of a retaining wall construction.

[0033] This geotextile-reinforced earth wall construction method has a double wall consisting of an outer wall and an inner wall with a U-shaped back surface. Crushed stone is placed in the space formed by the outer and inner walls, and geotextile is laid in the embankment as a reinforcing material. The embankment is reinforced by the frictional resistance between the embankment material and the geotextile.

[0034] As mentioned in the section on [Problems the invention aims to solve], precast concrete members have standardized sizes, and in the case of concrete members for geotextiles, the height dimension is usually 400mm to 900mm. On the other hand, in order to move safely from the upper level to the lower level, a height difference of 400mm or less is desirable.

[0035] Therefore, in this first embodiment, a single step-shaped member is installed near the stepped portion of the upper side wall block from the viewpoint of ensuring safety while maintaining the flatness of the work path.

[0036] Figure 1 is a schematic front view of the scaffolding structure (first embodiment) of the geotextile reinforced earth wall construction method as a retaining wall according to the present invention, in which the scaffolding structure is constructed in front of the wall body block. Figure 2 is an enlarged view of part A in Figure 1, and Figure 3 is a plan view of Figure 2.

[0037] In this first embodiment, as shown in Figures 1 to 3, in order to form a retaining wall having a gradient in the longitudinal direction indicated by arrow X, wall body blocks 2a, 2b, 2c, etc., which are made of precast concrete members 1, etc. and have flat top surfaces, are connected in a stepped manner via stepped sections 3a, 3b, etc., and a scaffolding structure is constructed in front of these wall body blocks 2a, 2b, 2c.

[0038] In other words, in this scaffolding structure, first scaffolding brackets 4a, 4b, 4c... are attached to predetermined positions on the wall surface of the wall body blocks 2a, 2b, 2c, excluding the stepped portions 3a, 3b..., and second scaffolding brackets 5b, 5c... are attached to predetermined positions on the wall surface near the stepped portions 3a, 3b..., and the scaffolding boards 6a, 6b, 6c... are supported by these first and second scaffolding brackets 4a, 4b, 4c..., 5b, 5c....

[0039] In this embodiment, the wall blocks 2a, 2b, 2c... are divided into upper and lower wall blocks with the stepped sections 3a, 3b... as the boundary. For example, with the stepped section 3a as the boundary, wall block 2b forms the upper wall block and wall block 2a forms the lower wall block, and with the stepped section 3b as the boundary, wall block 2c forms the upper wall block and wall block 2b forms the lower wall block. Similarly, the scaffolding boards 6a, 6b, 6c are formed as upper and lower scaffolding boards with the stepped sections 3a, 3b... as the boundary.

[0040] For the sake of explanation, in the following, the alphabetical part of the component symbols will be omitted, and for example, wall block 2a, 2b, 2c... will be simply written as wall block 2.

[0041] Figure 4 is an enlarged view of section B in Figure 2, showing the state in which the first scaffolding bracket 4 is attached to the wall block 2. Figure 5 is a right side view of Figure 4, showing the state in which the first scaffolding bracket 4 is tightly fixed to the wall block 2.

[0042] Specifically, the first scaffolding bracket 4 is formed in a roughly triangular shape as shown in Figure 5, and has a scaffolding support part 7 that supports the upper scaffolding board 6b, a wall contact part 8 that is tightly fixed to the wall block 2, and a reinforcing rod 9. A single pipe insertion opening 11 into which a scaffolding single pipe 10 is inserted is attached to the tip of the scaffolding support part 7. A retaining wall fixing fitting 12 is attached to the wall contact part 8 in a superimposed manner. Specifically, an elongated hole 13 is formed in an inclined manner in the retaining wall fixing fitting 12, while a through hole 14 is formed in the upper part of the wall contact part 8 of the first scaffolding bracket 4 as shown in Figure 4, and the wall contact part 8 and the retaining wall fixing fitting 11 are fastened together with bolts 15a and nuts 15b, thereby tightly fixing the wall contact part 8 to the wall block 2.

[0043] Figure 6 is an enlarged view of section D in Figure 5, showing the assembly state of the retaining wall fixing bracket 12 to the wall surface contact portion 8.

[0044] The retaining wall fixing bracket 12 is formed in a flat shape. The upper portion 16 extends horizontally at its tip, then slopes downward, and is then extended horizontally again to connect to the tip of the bottom portion 17, which will be described later. The base end of the upper portion 16 is bent into an L shape and connected to the base end of the bottom portion 17. The bottom portion 17 extends horizontally opposite to the upper portion 16, and its tip slopes downward, similar to the upper portion 16, then extends horizontally again, and its tip is formed in a curved shape and connected to the tip of the upper portion 16. The elongated hole 13 is provided between the upper portion 16 and the bottom portion 17 in an inclined manner from top to bottom.

[0045] Since gaps are formed between the precast concrete members 1, the retaining wall fixing bracket 12 is inserted into these gaps, thereby securing it between the concrete members 1. Then, by fastening the bolts 15a and nuts 15b, which are inserted through the through holes 13 and elongated holes 12 formed in the wall contact portion 8, near the wall contact portion 8, the retaining wall fixing bracket 12 is not moved vertically, and the first scaffolding bracket 4 is firmly fixed to a predetermined position on the wall surface of the wall body block 2, i.e., in the gap between the concrete members 1.

[0046] Furthermore, the retaining wall fixing bracket 12 can be easily attached to and detached from the wall body block 2 as follows.

[0047] Specifically, as shown in Figure 7, a bolt 15a is inserted through the wall contact portion 8 of the first scaffolding bracket 4 and the elongated hole 13 of the retaining wall fixing fitting 12, and a nut 15b is loosely attached at an appropriate position on the upper side of the elongated hole 13. In this state, the retaining wall fixing fitting 12 is fitted into the gap formed between the concrete members 1. Next, the bolt 15a and nut 15b are slid downward, i.e., toward the wall body block 2, as indicated by the arrow Y, and firmly fastened. In this way, the first scaffolding bracket 4 can be firmly attached to the predetermined position on the wall surface of the wall body block 2, i.e., in the gap between the concrete members 1, without wobbling.

[0048] Furthermore, the first scaffolding bracket 4 can be detached from the wall block 2 by loosening the bolts 15a and nuts 15b mentioned above, moving these bolts 15a and nuts 15b to the upper side of the elongated hole 13, thereby easily detaching the retaining wall fixing fitting 11 from the wall block 2.

[0049] Figure 8 is an enlarged view of section C in Figure 2. Figure 9 is a left side view of Figure 8, showing the assembled state of the second scaffolding bracket 5 of the staircase-shaped member 18.

[0050] In other words, as shown in Figures 8 and 9, the scaffolding structure comprises a second scaffolding bracket 5 attached to a predetermined position on the wall surface of the wall body block 2 near the stepped portion 3, and a stepped member 18 whose one end is hooked onto the second scaffolding bracket 5 and whose other end is in contact with the lower scaffolding board 6a.

[0051] Figure 10 shows the state in which the second scaffolding bracket 5 is attached to the retaining wall fixing fitting 30.

[0052] The second scaffolding bracket 5 comprises a rectangular or substantially rectangular frame 19 and an intermediate rod 20 interposed horizontally within the frame 19. Specifically, the frame 19 has an upper frame portion 21 that supports the upper scaffolding board 6b, a lower frame portion 22 that supports the lower scaffolding board 6a, and first and second vertical frame portions 23 and 24 that connect the upper frame portion 21 and the lower frame portion 22, and the upper frame portion 21 and the intermediate rod 20 are connected via a connecting rod 25. That is, most of the first and second vertical frame portions 23 and 24 together with the upper frame portion 21, the intermediate rod 20 and the connecting rod 25 form a gate-shaped member 26, and the gate-shaped member 26 and a U-shaped member 27 including the lower frame portion 22 are fastened together via bolts 28a, 28b and nuts 28c and 28d. Furthermore, similar to the first scaffolding bracket 4, the second vertical frame section 24 is provided with a single pipe insertion opening 29, and retaining wall fixing fittings 30 having the same shape as the first scaffolding bracket 4 are attached in a superimposed manner to the upper part of the first vertical frame section 23. That is, through holes 31 and elongated holes 32 are formed in the second scaffolding bracket 5 and the retaining wall fixing fittings 30, and the first vertical frame section 23 and the retaining wall fixing fittings 30 are fastened together with bolts and nuts (fasteners) via the through holes and elongated holes 32, so that the first vertical frame section 23 acts as a wall-contacting part and the second scaffolding bracket 5 is firmly fixed to the wall block 2.

[0053] Figure 11 shows an assembly diagram of the stepped member 18.

[0054] In other words, the staircase member 18 has a base 36 that contacts the lower scaffolding board 6a, a pair of hook fittings 33a and 33b that are hooked onto the intermediate rod 20, a pair of inclined side plate portions 34a and 34b that connect the hook fittings 33a and 33b to the base 36, and a step portion 35 interposed between these two side plate portions 34a and 34b.

[0055] Specifically, the hook fittings 33a and 33b have hooking portions 37a and 37b whose tips are formed in an inverted U shape so as to be able to be hooked onto the intermediate rod 20. They are extended horizontally and bent so as to overlap with a pair of side plate portions 34a and 34b to form inclined portions 38a and 38b, and a suitable number of holes are provided through the inclined portions 38a and 38b so as to be able to fasten them to the side plate portions 34a and 34b. In addition, fixing pins 39a to 39d are provided protruding from the vicinity of the hooking portions 37a and 37b, and fixing hooks 40a and 40b are provided so as to be able to engage with the fixing pins 39a to 39d, making it easy to attach and detach the hook fittings 33a and 33b to the intermediate rod 20.

[0056] Furthermore, the side plate portions 34a and 34b are formed, for example, as U-shaped members with both ends bent in an L-shape, and a suitable number of holes are provided through them corresponding to the inclined portions 38a and 38b of the hook fittings 33a and 33b so that they can be fastened to the inclined portions 38a and 38b of the hook fittings 33a and 33b.

[0057] Furthermore, the base 36 is formed in a flat plate shape and is appropriately bent so that it can be fastened to the fastener 41 and side plate portions 34a and 34b that are fitted between the lower scaffolding boards 6a.

[0058] Then, the hook fittings 33a and 33b are fastened to the side plates 34a and 34b, the side plates 34a and 34b to the base 36, and the base 36 to the fastener 41 via bolts and nuts. Furthermore, the hooking parts 37a and 37b of the hook fittings 33a and 33b are hooked to the intermediate rod 20, thereby assembling the stepped member 18 and installing it near the stepped section 3.

[0059] Figure 12 is a flowchart showing the construction procedure for the scaffolding assembly method according to the present invention.

[0060] First, in step S1, the necessary components for constructing the scaffolding structure are prepared, including the first scaffolding bracket 4, the second scaffolding bracket 5, retaining wall fixing fittings 12 and 30, scaffolding boards 6, and staircase members 18. Next, in step S2, bolts are inserted through the through holes of the first and second scaffolding brackets 4 and 5 and the elongated holes of the retaining wall fixing fittings 12 and 30, and nuts are loosely fastened. Then, in step S3, the retaining wall fixing fittings 12 and 30 are inserted into the gaps between the concrete members 1, and the loosely fastened bolts and nuts are slid along the elongated holes toward the concrete members 1 (wall block 2), and then firmly fastened, thereby fixing the first and second scaffolding brackets 4 and 5 to their predetermined positions on the wall.

[0061] Next, proceeding to step S4, a portion of the scaffolding board that will become the upper scaffolding board 6b is placed on the scaffolding support portion 7 of the first scaffolding bracket 4 and the upper frame portion 21 of the second scaffolding bracket 5 (frame 19), and these scaffolding boards are supported by the first and second scaffolding brackets 4 and 5.

[0062] Next, in step S5, a portion of the scaffolding board that will become the lower scaffolding board 6a is placed on the scaffolding support portion 7 of the first scaffolding bracket 4 and the lower frame portion 22 of the second scaffolding bracket 5 (frame 19), and these scaffolding boards are supported by the first and second scaffolding brackets 4 and 5.

[0063] Next, the process proceeds to step S6, where the components of the staircase member 18 are used to assemble the staircase member 18. Specifically, the fixing hook 40 is attached to the fixing pin 39 of the hook fitting 33, and then the hook fitting 33, step section 35, and base 36 are attached to the side plate section 34 using bolts and nuts, thereby assembling the staircase member 18. Then, in step S7, the hooking section 37 of the hook fitting 33 is attached to the intermediate rod 20, thereby allowing the staircase member 18 to be positioned near the step section 3. Finally, the fastener 41 is fitted between the lower scaffolding boards, and then the base 36 and the fastener 41 are fastened together with bolts and nuts, thereby constructing the desired scaffolding structure.

[0064] As described above, according to the scaffolding structure and scaffolding assembly method for retaining wall construction of the present invention, the second scaffolding bracket 5 has a rectangular or substantially rectangular frame 19 and an intermediate rod 20 interposed horizontally within the frame 19, the upper scaffolding board 6b is supported by the scaffolding support portion 7 of the first scaffolding bracket 4 and the upper frame portion 21 of the frame 19, the lower scaffolding board 6a is supported by the lower frame portion 21 of the frame 19 and the scaffolding support portion 7 of the first scaffolding bracket 4, one end of the staircase-shaped member 18 is hooked onto the intermediate rod 20 of the second scaffolding bracket 5, and the other end of the staircase-shaped member 18 is in contact with the lower scaffolding board 6a, so that the staircase-shaped member 18 is installed near the step portion 3, thereby ensuring the flatness of the work path and enabling smooth movement from the upper side wall block to the lower side wall block, or from the lower side wall block to the upper side wall block. Therefore, it is possible to effectively avoid the risk of workers falling from steps or other uneven surfaces, improve work efficiency in a simple and inexpensive way, and enhance worker safety.

[0065] Moreover, in addition to the first scaffolding bracket 4, the second scaffolding bracket 5 described above is attached to a predetermined position on the wall surface near the stepped section 3 via the retaining wall fixing fitting 30, and the stepped member 18 is simply hooked onto the intermediate rod 20. Thus, a desired scaffolding structure with good workability and safety can be constructed with a simple structure.

[0066] Furthermore, according to the scaffolding bracket-equipped staircase member of the present invention, the present invention comprises a base 36, hook fittings 33a and 33b, a pair of inclined side plate portions 34a and 34b that connect the hook fittings 33a and 33b to the base 36, and a step portion 35 interposed between the pair of side plate portions 34a and 34b. The hook fittings 33a and 33b are hooked onto the intermediate rod 20 of a scaffolding bracket 5 which has a rectangular or substantially rectangular frame 19 and an intermediate rod 20 interposed horizontally within the frame 19. Therefore, even when a step occurs when stacking precast concrete members 1 to form a wall block 2, by placing this bracket-equipped staircase member near the step, it becomes possible to form a retaining wall with improved workability and safety, thus providing a bracket-equipped staircase member suitable for such a scaffolding structure.

[0067] (Second Embodiment) In this second embodiment, a scaffolding structure suitable for the steel-reinforced earth wall construction method will be described as an example of a retaining wall construction.

[0068] In the first embodiment, the number of steps in the staircase-like member (number of step sections) was set to "1," but it is preferable to set the number of steps in the staircase-like member according to the size of the precast concrete member.

[0069] In other words, in the case of the steel-reinforced earth wall construction method, the height of the concrete members is large, ranging from 750 mm to 1500 mm, and therefore the height difference of the stepped sections is also large, so it is preferable to set the number of steps in the stepped members to "2".

[0070] This steel strip reinforced earth wall construction method involves connecting steel strips, which serve as reinforcing materials, to the back of the wall body and laying them in the embankment. The embankment is then reinforced by the frictional resistance between the embankment material and the steel strips.

[0071] The following details the scaffolding structure suitable for the steel-reinforced earth wall construction method.

[0072] Figure 13 is an enlarged front view of the main part of a second embodiment of the scaffolding structure for retaining wall construction according to the present invention, in which, similar to the first embodiment, the scaffolding structure is constructed on the front of the wall body block.

[0073] In other words, in this second embodiment as well, in order to form a retaining wall having a slope in the longitudinal direction indicated by arrow Z, wall body blocks 43a and 43b, which are made of precast concrete members 42 and have flat top surfaces, are connected in a stepped manner via a stepped portion 44, and a scaffolding structure is constructed in front of these wall body blocks 43a and 43b.

[0074] Specifically, in this scaffolding structure, similar to the first embodiment, first scaffolding brackets 45a and 45b are attached to predetermined positions on the wall surface, excluding the vicinity of the stepped portion 44 of the wall body blocks 43a and 43b, and a second scaffolding bracket 46b is attached to a predetermined position on the wall surface near the stepped portion 44. Also, similar to the first embodiment, a staircase-shaped member 47 is arranged near the stepped portion 44, with the upper scaffolding board 48b supported by the scaffolding support portion of the first scaffolding bracket 45 and the upper frame portion of the second scaffolding bracket 46, and the lower scaffolding board 48b supported by the scaffolding support portion of the first scaffolding bracket 45 and the lower frame portion of the second scaffolding bracket 46.

[0075] Figure 14 is an assembly diagram of the stepped member 47 described above.

[0076] The staircase member 47 includes a base 50 that contacts the lower scaffolding board 48b, a pair of hook fittings 52a, 52b that are hooked onto the intermediate rod 51 of the second scaffolding bracket 46, a pair of inclined side plate sections 53a, 53b that connect the hook fittings 52a, 52b to the base 50, and two plate-shaped step sections 54a, 54b interposed between the pair of side plate sections 53a, 53b.

[0077] In other words, this second embodiment is the same as the first embodiment except that it is provided with two step sections 54a and 54b. In this second embodiment as well, fixing pins 55a to 55d are provided protruding from the hook fittings 52a and 52b, and fixing hooks 56a and 56b are provided so as to be able to engage with the fixing pins 55a to 55d. The side plates 53a and 53b are fastened to the hook fittings 52a and 52b and the base 50, the side plates 54a and 54b are fastened to the step sections 54a and 54b, and the base 50 is fastened to the fixing device 64, respectively, with fasteners such as bolts and nuts.

[0078] Figure 15 shows the assembled state of the staircase-shaped member 47 to the second scaffolding bracket 46.

[0079] In other words, the second scaffolding bracket 46, like the first embodiment, has retaining wall fixing fittings 65 attached to it in an overlapping manner via through holes and elongated holes.

[0080] The second scaffolding bracket 46, like the first embodiment, is composed of a frame 61 whose main parts consist of an upper frame 57, a lower frame 58, and first and second vertical frame sections 59 and 60, with an intermediate rod 51 interposed between the first vertical frame section 59 and the second vertical frame section 60. The upper frame section 57, most of the first and second vertical frame sections 59 and 60, the intermediate rod 51, and the connecting rod 49 form a gate-shaped member 62.

[0081] Furthermore, the U-shaped member 63, which includes the lower frame portion 58 connected to the gate-shaped member 62, is formed with a larger vertical dimension relative to the lower frame portion 58 than in the first embodiment, in accordance with the height difference of the stepped portion 44. This makes it possible to arrange the two step portions 54a and 54b within the frame body 61, and the staircase-shaped member 47 can be installed near the stepped portion 44 by hooking the hook fitting 52 onto the intermediate rod 51.

[0082] Thus, in this second embodiment, as in the first embodiment, it is possible to ensure the flatness of the work path while smoothly moving from the upper side wall block to the lower side wall block, or from the lower side wall block to the upper side wall block, thereby improving work efficiency and enhancing worker safety, and making it possible to construct a scaffolding structure that is simple, inexpensive, and has good work efficiency and safety.

[0083] It goes without saying that the present invention is not limited to the embodiments described above, and can be modified without departing from the spirit of the invention. That is, although the above embodiments described geotextile reinforced earth wall construction and strip steel reinforced earth wall construction as exemplary retaining wall constructions, the present invention is not limited to these embodiments, and can be applied to, for example, the multi-anchor type reinforced earth wall construction (a method in which a large number of anchor plates are laid in the embankment, the wall body block and the anchor plates are fastened together with tie bars, and the embankment sandwiched between the wall body block and the anchor plates is restrained to form an earth wall) and other reinforced earth wall construction methods, and can be broadly applied to construction methods in which steps occur in the wall body block when forming a retaining wall using precast concrete members.

[0084] Furthermore, it goes without saying that the above embodiments are merely examples and are not limited to the shapes of the components, such as the retaining wall fixing brackets. [Industrial applicability]

[0085] When stacking precast concrete members to form a retaining wall with a longitudinal slope, placing a staircase-like member with scaffolding brackets near the stepped section improves work efficiency and safety. [Explanation of Symbols]

[0086] 1.42 Concrete members 2a, 2b, 2c, 43a, 43b Wall block 3a, 3b, 44 Step part 4a, 4b 4c, 45a, 45b First scaffolding bracket 5a, 5b, 46b Second scaffolding bracket 6a, 6b, 48a, 48b scaffolding planks 7. Scaffolding support section 12, 30, 65 Retaining wall fixing hardware 13, 32 long hole 18, 47 Stepped member 19, 61 Frame 20, 51 Intermediate rod 21, 57 Upper frame part 22, 58 Lower frame part 26, 62 Gate-type members 27, 63 U-shaped member 33, 52 Hook fittings 34a, 34b, 53a, 53b side plate part 35, 54a, 54b Step section 36, 50 bases

Claims

1. In a retaining wall construction method in which wall body blocks made of concrete members with flat top surfaces are connected in a stepped manner via stepped sections in order to form a retaining wall having a gradient in the longitudinal direction, a scaffolding structure is provided in front of the wall body blocks, The system comprises a first scaffolding bracket having a roughly triangular shape with a scaffolding support portion, and a second scaffolding bracket having a rectangular or roughly rectangular frame and an intermediate rod interposed horizontally within the frame. The wall body block is divided into an upper side wall body block and a lower side wall body block with the stepped portion as the boundary. The first scaffolding bracket is attached to a predetermined position on the wall surface of the upper side wall block, excluding the vicinity of the stepped portion, The second scaffolding bracket is attached to a predetermined position on the wall surface near the stepped portion of the upper side wall block. The upper scaffolding board is supported by the scaffolding support portion of the first scaffolding bracket and the upper frame portion of the frame, The lower scaffolding board is supported by the lower frame portion of the frame body and the scaffolding support portion of the first scaffolding bracket. A scaffolding structure for a retaining wall, characterized in that a stepped member is provided near the stepped portion of the upper wall block, with one end of which is hooked onto the intermediate rod and the other end in contact with the lower scaffolding board.

2. The scaffolding structure for retaining wall construction according to claim 1, characterized in that the staircase-shaped member comprises a base that contacts the lower scaffolding board, a hook fitting that is attached to the intermediate rod, a pair of inclined side plate portions that connect the hook fitting and the base, and a step portion interposed between the pair of side plate portions.

3. The scaffolding structure for retaining wall construction according to claim 1 or 2, characterized in that the frame is connected to a U-shaped member including the upper frame and the intermediate rod.

4. The scaffolding structure for retaining wall construction according to claim 1 or 2, characterized in that the number of steps of the stepped member is set according to the height difference of the stepped portion.

5. The scaffolding structure for a retaining wall according to claim 1 or 2, characterized in that flattened retaining wall fixing fittings are attached in a superimposed manner to each of the first and second scaffolding brackets and inserted into the gaps in the concrete member, and the first and second scaffolding brackets are each tightly fixed to the wall body block via the retaining wall fixing fittings.

6. The retaining wall fixing fitting has an elongated hole formed in an inclined shape, and each of the first and second scaffolding brackets has a through hole formed therein. The scaffolding structure for a retaining wall according to claim 5, characterized in that the fasteners are inserted through the through holes and the elongated holes and positioned on the wall block side of the elongated holes, and the first and second scaffolding brackets and the respective retaining wall fixing fittings are fastened together.

7. The retaining wall is constructed using a geotextile-reinforced earth wall construction method, characterized in that the retaining wall is a scaffolding structure for a retaining wall according to claim 1 or 2.

8. The retaining wall is constructed using a steel-reinforced earth wall construction method, characterized in that the retaining wall is a scaffolding structure for a retaining wall according to claim 1 or 2.

9. It comprises a base, a hook fitting, a pair of inclined side plates connecting the hook fitting and the base, and a step interposed between the pair of side plates. A staircase-like member with a scaffolding bracket, characterized in that the hook fitting is hooked onto the intermediate rod of a scaffolding bracket having a rectangular or substantially rectangular frame and an intermediate rod interposed horizontally within the frame.

10. The scaffolding bracket-equipped staircase member according to claim 9, characterized in that the frame has an upper frame portion and a lower frame portion, and a gate-shaped member having the upper frame portion and the intermediate rod is connected to a U-shaped member including the lower frame portion.

11. A method for assembling scaffolding to be constructed on the front of a retaining wall in a retaining wall construction in which wall body blocks made of concrete members, each having a flat top surface, are connected in a stepped manner via stepped sections, in order to form a retaining wall having a gradient in the longitudinal direction, A first scaffolding bracket having a roughly triangular shape with a scaffolding support portion, a second scaffolding bracket having a rectangular or roughly rectangular frame and an intermediate rod interposed horizontally within the frame, and a staircase-shaped member are prepared. The wall body block is divided into an upper side wall body block and a lower side wall body block with the stepped portion as the boundary, The first scaffolding bracket is attached to a predetermined position on the wall surface of the upper side wall block, excluding the vicinity of the stepped portion, The second scaffolding bracket is attached to a predetermined position on the wall surface near the stepped portion of the upper side wall block. The upper scaffolding board is supported by the scaffolding support portion of the first scaffolding bracket and the upper frame portion of the frame, The lower scaffolding board is supported by the lower frame portion of the frame body and the scaffolding support portion of the first scaffolding bracket. A method for assembling scaffolding, characterized in that one end of the stepped member is hooked onto the intermediate rod and the other end is placed near the stepped portion of the upper side wall block so as to be in contact with the lower side scaffolding board.

12. The scaffolding assembly method according to claim 11, characterized in that a hook fitting is provided at the tip of the step-shaped member and the hook fitting is hooked onto the intermediate rod.

13. The scaffolding assembly method according to claim 11 or 12, characterized in that the number of steps of the staircase-like member is set according to the height difference of the step portion.

14. A method for assembling scaffolding according to claim 11 or 12, characterized in that flat retaining wall fixing fittings are attached in a superimposed manner to each of the first and second scaffolding brackets, the retaining wall fixing fittings are inserted into the gaps in the concrete members, and the first and second scaffolding brackets are each tightly fixed to the wall body block.

15. The scaffolding assembly method according to claim 14, characterized in that through holes are formed in each of the first and second scaffolding brackets, and inclined elongated holes are formed in the retaining wall fixing fittings, and after the fasteners are loosely attached to the through holes and the elongated holes, the fasteners are slid within the elongated holes toward the wall block side to fasten the first and second brackets and each of the retaining wall fixing fittings, respectively.

16. The scaffolding assembly method according to claim 11 or 12, characterized in that the retaining wall is formed using a geotextile reinforced earth wall construction method.

17. The scaffolding assembly method according to claim 11 or 12, characterized in that the retaining wall is formed using a steel strip reinforced earth wall construction method.

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