Earth retaining support structure and corner joint pieces

Abstract

To provide an earth-retaining timbering structure and a corner part joint piece used for the earth-retaining timbering structure, capable of improving work efficiency with a simple configuration.SOLUTION: An earth-retaining timbering structure reinforcing an earth-retaining timbering wall is provided with a corner joint piece placed on a convex corner part which is formed by abutting one of end surfaces of a wale against a side surface of the other wale adjacent to the one wale on the same flat surface. On one end of both end parts of the corner joint piece, a tension resistance joint structure is provided allowing resistance against tension force generated between the one wale and itself, and on the other end, a shearing resistance joint structure is provided allowing resistance against tension force and shearing force generated between the other wale and itself.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an earth retaining support structure that stiffens an earth retaining wall, and a corner connecting piece used in the earth retaining support structure. [Background technology]

[0002] One type of support used to reinforce an earth retaining wall surrounding an excavation area is a strut support. In a strut support, for example, multiple wales are combined to form a framework, and struts and flints are installed inside this framework. By abutting the outside of the framework made of wales against the earth retaining wall in this state, deformation of the earth retaining wall toward the excavation area due to earth pressure from the surrounding ground is suppressed.

[0003] It is generally known that in such strut-type supports, when excessive earth pressure acts on the retaining wall from the surrounding ground, a large bending moment occurs at the corners of the wale-raised framework. For this reason, it is necessary to ensure that the corners have high rigidity to withstand this force.

[0004] Therefore, as shown in Figure 9, for example, a corner piece 54 having a right-angled triangular shape in plan view and a corner flint beam 55 are often placed near a projecting corner 53 of a framework consisting of a wale 52 formed on the side of an excavation area 50 surrounded by an earth retaining wall 51. The corner flint beam 55 is formed by assembling a main flint member 551 and a pair of flint receiving pieces 552 provided on both ends of the main flint member 551. In this case, the work of attaching a total of four members to the vicinity of the projecting corner 53 by bolting them together is very time-consuming.

[0005] In this context, for example, Patent Document 1 discloses a configuration in which a corner piece that is trapezoidal in plan view is bolted near the projecting corner of a frame in which wales are joined together on the same plane, thereby stiffening the projecting corner. The corner piece in Patent Document 1 is formed by overlapping and welding together the flanges of multiple H-shaped steel beams to form an integrated unit, and then welding together mounting face plates, each with bolt holes for bolting to the wales, to each side of the integrated H-shaped steel beam. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 57-75036 Summary of the Invention [Problem to be solved by the invention]

[0007] The corner piece of Patent Document 1 reduces the number of components compared to the case where a corner piece 54 and a corner brace 55 are arranged as shown in Figure 9, and also reduces the work involved in bolting, making it possible to reduce labor required for the work.

[0008] However, because any material can be used for the retaining wall, the bolt hole error absorption capacity is generally about 2 to 3 mm, despite the low installation accuracy of about 50 to 100 mm. For this reason, when the corner piece of Patent Document 1 is placed at an external corner, the bolt holes on both sides of it will not be aligned with the bolt holes on the opposing wale, which can easily result in a situation where the wale and the corner piece of Patent Document 1 cannot be bolted together.

[0009] Furthermore, as mentioned above, the corner piece in Patent Document 1 is manufactured by welding multiple H-shaped steel beams together and welding mounting face plates to both ends, which means that both the outer diameter and weight of the piece tend to be large. This makes it difficult to transport the piece to the construction site and install it in the corner, and removal can also be very time-consuming.

[0010] The present invention has been made in consideration of such problems, and its main object is to provide an earth retaining support structure and a corner connecting piece for use in an earth retaining support structure that has a simple configuration and can improve work efficiency. [Means for solving the problem]

[0011] In order to achieve this object, the earth retaining support structure of the present invention is an earth retaining support structure that stiffens an earth retaining wall, in which a corner connecting piece is arranged at a projecting corner formed by abutting the end face of one wale against the side face of the other adjacent wale on the same plane, and one end of both ends of the corner connecting piece is provided with a tension-resistant connecting structure that can resist the tensile force generated between the one wale that abuts against the side face of the other wale but does not have a mechanism for resisting shear force, and the other end is provided with a shear-resistant connecting structure that can resist the tensile force and shear force generated between the other wale that abuts against the end face of the one wale. The tension-resistant connection structure includes a long hole provided on one end side of the corner connection piece, a through hole provided in one of the wales that abuts against the side surface of the other wales, and a fastening member that passes through the through hole and the long hole. It is characterized by:

[0012] The earth retaining support structure of the present invention only requires a tension-resistant connection structure between one end of the corner joint piece and one of the wales, eliminating the need for a mechanism to resist shear forces. This allows the tension-resistant connection structure to function as a position adjustment part when installing the corner joint piece at the projected corner.

[0013] Therefore, even if one or the other wale is misaligned, resulting in some construction error near the corner, the corner connection piece can be easily installed at the corner using the tension resistance connection structure. This significantly improves work efficiency and contributes to shortening the construction period and reducing construction costs for the entire earth retaining support structure.

[0014] Furthermore, because the corner flashing beams 55 used in the conventional technology can be omitted, it is possible to secure a large working space in the excavation area surrounded by the earth retaining wall, which can contribute to improving the productivity of the entire series of work related to the construction of the framework carried out inside the earth retaining wall.

[0016] Furthermore, if clamping fixtures are used in the tension resistance connection structure, This simple structure involves clamping one wale and one end of the corner joint piece together with a clamping fixture. This simplifies the work compared to bolted joints, improving workability and shortening work time. Furthermore, even if bolted joints are used for the shear-resistant joint structure between the other wale and the other end of the corner joint piece, the total number of bolts required to install the corner joint piece can be significantly reduced, making it economical and contributing to reduced construction costs.

[0018] Also, Even when a fastening member such as a bolt is used for the tensile resistance connection structure, the elongated hole provided on one end side of the corner connection piece can function as a position adjustment part, and a tensile resistance connection structure can be easily provided between one end side of the corner connection piece and one of the ribs.

[0019] The corner connecting piece of the present invention is a corner connecting piece used in the earth retaining support structure of the present invention, The aforementioned One side of the belly rising The aforementioned A trapezoidal main member is bridged between the other wale and the main member, and is fixed to one end side of the main member in the longitudinal direction, The tension resistance plate having the long holes formed therein and

[0020] Further, the corner connecting piece of the present invention is A plurality of the main members having different lengths are arranged in parallel, and the tension resistance plate is provided across the plurality of the main members. It is characterized by:

[0021] The corner connecting piece of the present invention is not only simple in structure, but can also be used as a single piece to replace the corner piece 54 and corner brace 55 described in the prior art of Figure 9, thereby reducing the labor required for carrying it in and out during installation and removal, and significantly improving workability.

[0022] In addition, by preparing multiple types of corner joint pieces with different lengths of main material, they can be arranged in parallel at the corner, and the required number of corner joint pieces can be adjusted and installed as needed depending on the earth pressure acting on the retaining wall. This eliminates the need to pre-fabricate dedicated corner joint pieces to accommodate earth pressure, improving economy and ease of construction. [Effects of the Invention]

[0023] According to the present invention, by providing corner connecting pieces at the protruding corners formed by adjacent wales, the retaining support structure can be simplified, and the work efficiency related to the overall construction of the retaining support structure can be improved, which can contribute to shortening the construction period and reducing construction costs. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a diagram showing an outline of an earth retaining support structure according to an embodiment of the present invention. FIG. [Figure 2] 10A and 10B are diagrams showing details of corner connecting pieces in an embodiment of the present invention. [Figure 3] FIG. 1 is a diagram showing the behavior of an earth retaining support structure when earth pressure acts in an embodiment of the present invention (part 1). [Figure 4] FIG. 2 is a diagram showing the behavior of an earth retaining support structure when earth pressure acts in an embodiment of the present invention (part 2). [Figure 5] 10A and 10B are diagrams illustrating an example in which a plurality of corner connecting pieces are employed in an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram showing a model used to estimate the weight and number of bolts used of an earth retaining support structure in an embodiment of the present invention. [Figure 7] FIG. 10 is a diagram showing the results of calculations of the weight and number of bolts used of the earth retaining support structure in an embodiment of the present invention. [Figure 8] 10A and 10B are diagrams showing other examples of corner connecting pieces in an embodiment of the present invention. [Figure 9]FIG. 1 is a diagram showing a conventional braced beam support using a corner piece and a corner stop beam at a projecting corner. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention aims to simplify the earth retaining support structure by eliminating corner bracing beams from the projecting corner formed by butting adjacent wales together on the same plane in a strut-type earth retaining support structure. The earth retaining support structure of the present invention and the corner connecting pieces used in the earth retaining support structure will be described below with reference to Figures 1 to 8.

[0026] <<Earth retaining support structure>> As shown in Figure 1, a strut-type earth retaining support structure 1 that reinforces the earth retaining wall R installed to surround the excavation area comprises one wale 2, two other wale 3 abutting each end of the wale 2, struts 4, and corner connecting pieces 6.

[0027] One waling 2 and the other waling 3 are both made of so-called main earth retaining material, and one waling 2 is composed of an H-shaped steel beam with a web 21 and a pair of flanges 22, and end plates 23 attached to both end faces. Similarly, the other waling 3 is composed of an H-shaped steel beam with a web 31 and a pair of flanges 32, and end plates 33 attached to both end faces.

[0028] These one wale 2 and the other wale 3 are arranged along the inner wall surface of the retaining wall R with the webs 21, 31 horizontal, forming a framework with a projected corner portion 5. The projected corner portion 5 is formed by abutting the end face of one wale 2 against the side surface of the other wale 3. In other words, the end plate 23 of one wale 2 abuts against the flange 32 of the other wale 3.

[0029] However, as long as one wale 2 and the other wale 3 are positioned on the same plane, they do not necessarily have to be in direct contact. For example, as shown in Figures 6(a) and 6(b), a block material 34 may be interposed between the end plate 23 of one wale 2 and the flange 32 of the other wale 3.

[0030] 1, the end plate 23 of one wale 2 and the flange 32 of the other wale 3 are connected by bolts 24, but this is not limited to this. If the two are in contact with each other so as to be able to transmit compressive force (a so-called metal-to-metal state), connecting members such as bolts 24 may be omitted.

[0031] The framework formed by butting one wale 2 against the other wale 3, together with the struts 4 and corner joint pieces 6 installed inside, prevents the retaining wall R from deforming inward. Any strut material commonly used for strut support can be used for the struts 4. In addition, concrete C is filled as a backfill material between the one wale 2 and the other wale 3 and the retaining wall R.

[0032] The corner connecting piece 6 is a member provided at the projected corner 5 formed by one wale 2 and the other wale 3. Details thereof will be explained below.

[0033] <<Corner connecting piece>> As shown in FIG. 2( a ), the corner joint piece 6 includes a main member 7 , a tension resistance plate 8 , and a shear resistance plate 9 .

[0034] The main member 7 is made of H-section steel and is formed into a trapezoidal shape in plan view so that it can fit into the corner portion 5, and is placed with the web 71 horizontal. At both ends of the main member 7, a tension resistance plate 8 is installed at the end facing the flange 22 of one of the wales 2, and a shear resistance plate 9 is installed at the end facing the flange 32 of the other wale 3.

[0035] The tension resistance plate 8 is formed from a steel plate with an area larger than the end face of the main material 7, and has a plurality of elongated holes 81 formed above and below the web 71 of the main material 7. The plurality of elongated holes 81 function as bolt holes used when bolting the corner connecting piece 6 to one of the wales 2, and are lined up in a row at equal intervals along the web 71, with the long diameter of the elongated holes 81 also extending along the web 71.

[0036] Like the tension resistance plate 8, the shear resistance plate 9 is formed from a steel plate with an area larger than the end face of the main material 7. A plurality of round holes 91 are formed above and below the web 71 of the main material 7. The plurality of round holes 91 function as bolt holes used when bolting the corner connecting piece 6 and the other wale 3 together.

[0037] The corner connecting piece 6 is arranged at the corner 5 as shown in Fig. 1, and a tension resistance connecting structure 12 is provided between one end side 62 on which the tension resistance plate 8 is provided and one of the wales 2. In addition, a shear resistance connecting structure 13 is provided between the other end side 63 on which the shear resistance plate 9 is provided and the other of the wales 3.

[0038] <<Tension-resistant joint structure 12>> The tension-resistant joint structure 12 and the shear-resistant joint structure 13 will be described in detail below.

[0039] As shown in Figure 3(a), when earth pressure P acts on the retaining wall R from the surrounding ground, one wale 2 and the other wale 3 each exhibit the following behavior.

[0040] As shown in Figure 3(b), one of the wales 2 exhibits deformation behavior in which the middle part in the longitudinal direction moves toward the excavation area, and the vicinity of the end part that abuts the other wale 3 moves toward the natural ground. In other words, in the vicinity of the end part of one of the wales 2, only tensile force acts on the joint part with one end side 62 of the corner connecting piece 6.

[0041] Therefore, a tension-resistant connection structure 12, which is a connection structure that can resist tension forces, can be provided between one of the wale raised portions 2 and one end side 62 of the corner connecting piece 6, and a mechanism that resists shear forces can be omitted. The tension-resistant connection structure 12 is a connecting structure using bolts 82 inserted through bolt holes consisting of elongated holes 81 provided in the tension-resistant plate 8 and through holes 25 provided in the flange 22 of one of the wale raised portions 2, as shown in Figure 2(a).

[0042] <<Shear-resistant joint structure 13>> As shown in FIG. 3( a ), the side surface of the other wale 3 near the end abuts against the end surface of one wale 2 .

[0043] Therefore, when earth pressure P acts on the other wale 3, the other wale 3 exhibits deformation behavior in which the middle part in the longitudinal direction moves toward the excavation area while the vicinity of the end is constrained, as shown in Figure 3(b). In other words, shear force and tensile force act on the joint between the other wale 3 and the other end side 63 of the corner connecting piece 6.

[0044] Therefore, a shear-resistant connection structure 13, which is a connection structure that can resist tensile force and shear force, is provided between the other wale 3 and the other end side 63 of the corner connecting piece 6 to connect them together. As shown in Figure 2(a), the shear-resistant connection structure 13 is a connection structure using bolts 92 inserted into bolt holes consisting of round holes 91 provided in the shear-resistant plate 9 and bolt holes consisting of through holes 35 provided in the flange 32 of the other wale 3.

[0045] The construction procedure for the earth retaining support structure 1 equipped with the above-mentioned tension-resistant connection structure 12 and shear-resistant connection structure 13 is as follows: first, the shear-resistant connection structure 13 is assembled between the other end 63 of the corner connecting piece 6 and the other wale 3. Then, the tension-resistant connection structure 12 is assembled between one end 62 of the corner connecting piece 6 and one of the wales 2, and the corner connecting piece 6 is installed at the projected corner 5.

[0046] In this way, the above-mentioned tension resistance connecting structure 12 can function as a position adjusting part. In other words, when there is a positional deviation in the arrangement position of one wale 2 or the other wale 3, the tension resistance connecting structure 12 can be provided between one end side 62 of the corner connecting piece 6 previously connected to the other wale 3 and one wale 2, while accommodating construction errors near the projected corner 5 that may occur due to the positional deviation.

[0047] Specifically, the elongated holes 81 in the tension resistance plate 8 function as position adjustment parts, and the through holes 25 in the flange 22 of one of the wales 2 are aligned with the elongated holes 81, and then the bolts 82 are inserted and bolted together. This significantly improves the work efficiency when installing the corner connecting pieces 6 in the projected corner parts 5, and contributes to shortening the construction period and reducing the construction costs for the entire construction of the earth retaining support structure 1.

[0048] Furthermore, since the corner flashing beams 55 used in the conventional technology as shown in Figure 9 can be omitted, it is possible to secure a large working space in the excavation area surrounded by the earth retaining wall R. This can contribute to improving the productivity of the entire series of work related to the construction of the skeleton carried out inside the earth retaining wall R.

[0049] As described above, the tension-resistant connecting structure 12 may employ any means as long as it has a configuration capable of resisting the tension force generated between one wale 2 and one end side 62 of the corner connecting piece 6, and a mechanism for resisting shear force may be omitted. Similarly, the shear-resistant connecting structure 13 may employ any means as long as it has a configuration capable of resisting the tension force and shear force generated between the other wale 3 and the other end side of the corner connecting piece 6.

[0050] Other Embodiments of the Tensile Resistance Coupling Structure 12 For example, as shown in Figure 2(b), the tension resistance connection structure 12 may be configured to clamp the tension resistance plate 8 of the corner connection piece 6 and the flange 22 of one of the wale ribs 2 using a clamping fixture 83 such as Bullman (registered trademark).

[0051] Clamping with clamping fittings 83 is easier than bolting, improving workability and shortening the work time when connecting the corner connecting piece 6 to one of the wales 2. Furthermore, even if bolting is used for the shear-resistant connecting structure 13 provided on the other end 63 of the other wale 3 and the corner connecting piece 6, the total number of bolts required to install the corner connecting piece 6 at the projected corner 5 can be significantly reduced, which is economical and contributes to reducing construction costs.

[0052] <<Other examples of earth retaining support structure 1>> Furthermore, in the earth retaining support structure 1, the corner connecting piece 6 may be installed at the protruding corner portion 5 by placing only one piece as shown in Figure 3(a), or by preparing multiple types of corner connecting pieces 6 with different lengths of main material 7 in advance and arranging multiple pieces in parallel as shown in Figure 4(a).

[0053] This makes it possible to adjust and install the required number of corner connecting pieces 6 as needed depending on the earth pressure P acting on the retaining wall R. This eliminates the need to prefabricate corner connecting pieces 6 specifically designed to accommodate the earth pressure P, improving economy and ease of construction. Note that while Figure 4(a) shows an example in which three corner connecting pieces 6 are arranged in parallel, the number is not limited to this.

[0054] Furthermore, when multiple corner connecting pieces 6 are arranged, they do not necessarily have to be connected to each other. This is because the corner connecting pieces 6 are fixed to one wale 2 and the other wale 3, so there is no misalignment between the corner connecting pieces 6.

[0055] However, since adjacent corner connecting pieces 6 may tend to move apart due to deflection caused by axial force, they may be connected using a connecting means 61 that can resist at least tensile force, as shown in Figure 5.

[0056] As a result, when adjacent corner connecting pieces 6 are connected by the connecting means 61, substantially only tensile force acts on the connecting means 61. Therefore, as shown in Fig. 5, for example, the connecting means 61 may be a bolt connection in which bolt holes 721 are provided in the flanges 72 of the main members 7 that make up the corner connecting pieces 6 and bolts are inserted into the opposing bolt holes 721. Alternatively, a clamping fixture 83 similar to that used in the tension-resistant connecting structure 12 may be used as the connecting means 61.

[0057] According to the earth retaining support structure 1 using the above-mentioned corner connecting piece 6 and corner connecting piece 6, the tension resistance connecting structure 12 can function as a position adjusting part when installing the corner connecting piece 6 at the projected corner part 5 formed by one wale 2 and the other wale 3. Therefore, the work efficiency when installing the corner connecting piece 6 at the projected corner part 5 is greatly improved, which can contribute to shortening the construction period and reducing the construction costs for the entire construction of the earth retaining support structure 1.

[0058] Furthermore, compared to the case where a corner piece 54 and a corner bracing beam 55 are used as conventional technology as shown in Figure 9, the earth retaining support structure 1 using the corner connecting piece 6 not only reduces the number of components to be placed at the protruding corner 5, but also makes it possible to significantly reduce the number of bolts required for installation on one wale 2 and the other wale 3.

[0059] This reduces the amount of work required and the total weight of the parts used, significantly improving work efficiency and contributing to shorter construction periods and reduced construction costs. Below is an example of a trial calculation of the part weight and number of bolts when corner connecting pieces 6 are used in the projected corners 5.

[0060] <<Estimated weight and number of bolts used for earth retaining support structure 1>> First, Fig. 6(a) shows, as a comparative example, an earth retaining support structure 1' that uses corner pieces 54 and corner flashing beams 55. In this comparative example, an excavation area that is approximately rectangular in plan view is surrounded by an earth retaining wall R, and one wale 2 and the other wale 3 are arranged on the same plane along the inner wall surface of the earth retaining wall R.

[0061] These one wale 2 and the other wale 3 are butted together via a block material 34 to form a projecting corner 5. After structural calculations were carried out, it was determined that struts were not necessary, so they were not installed, and instead corner pieces 54 and corner bracing beams 55 were installed at each of the four projecting corners 5, and a retaining support structure 1' was established.

[0062] In the above comparative example, as shown in Figure 7(b), H-350 main earth retaining members are used for one wale 2 and the other wale 3, and H-300 x 300 H-shaped steel is used for the main flashing member 551 of the corner flashing beam 55. As a result, the total weight of one wale 2 and the other wale 3 (two pieces each, for a total of four pieces) is 3,390 kg, and the total weight of the reaction force resistance member (total weight of four corner pieces 54 and four corner flashing beams 55) is 1,720 kg.

[0063] In other words, the total weight of the earth retaining support structure 1' is 5,110 kg. In addition, a total of 168 bolts were required to install the reaction-resistance members (corner pieces 54 and corner braces 55) at each of the four projecting corners 5. Furthermore, Figure 7(a) shows that the gable span is approximately 6.9 m, and that it bears a support reaction force of 50 kN / m.

[0064] On the other hand, Fig. 6(b) shows Example 1 of the earth retaining support structure 1 using corner connecting pieces 6. In the earth retaining support structure 1 of Example 1, corner connecting pieces 6 are installed in place of corner pieces 54 and corner bracing beams 55 at four protruding corners 5 formed under the same conditions as in the comparative example.

[0065] 7(b), in Example 1, H-350 main earth retaining members are used for one wale 2 and the other wale 3, and H-600 x 350 H-shaped steel is used for the main member 7 of the corner connecting piece 6. As a result, the total weight of one wale 2 and the other wale 3 (two of each for a total of four) is 3,390 kg, and the total weight of the reaction resistance member (total weight of four corner connecting pieces 6) is 1,400 kg.

[0066] Therefore, the total weight of the earth retaining support structure 1 of Example 1 is 4,790 kg. Also, a total of 80 bolts were required to install the reaction-resisting members (corner connecting pieces 6) at each of the four projecting corners 5. Furthermore, looking at Figure 7(a), it can be seen that when the gable span is approximately 6.9 m, the support reaction force is approximately 150 kN / m, which is significantly higher than the approximately 50 kN / m of the comparative example.

[0067] As a result, by adopting the retaining support structure 1 of Example 1 using corner connecting pieces 6 instead of the retaining support structure 1 of the comparative example, the overall weight can be reduced by approximately 320 kg and the number of bolts used can be reduced to more than half.

[0068] Therefore, it is possible to reduce the labor required for transporting and unloading during installation and removal, and also to reduce the bolt tightening work, thereby significantly improving workability. Also, compared to the comparative example of the earth retaining support structure 1', it is possible to ensure a larger working space in the excavation area surrounded by the earth retaining wall. This can contribute to improving the productivity of the entire series of work related to the construction of the skeleton carried out inside the earth retaining wall.

[0069] In addition, the earth retaining support structure 1 of Example 1 can withstand a support reaction force of approximately 150 kN / m, which is sufficient compared to the 50 kN / m of the comparative example. Therefore, the same study as for the earth retaining support structure 1 of Example 1 was conducted on Example 2, in which the sizes of one wale 2, the other wale 3, and the corner connecting pieces 6 were reduced.

[0070] In Example 2, as shown in Figure 7(b), H-300 main earth retaining members were used for one wale 2 and the other wale 3, and H-600 x 300 H-shaped steel was used for the main member 7 of the corner connecting piece 6. As a result, the total weight of one wale 2 and the other wale 3 (two of each for a total of four) is 2280 kg, and the total weight of the reaction resistance member (total weight of four corner connecting pieces 6) is 1020 kg.

[0071] In other words, the total weight of the earth retaining support structure 1 of Example 2 is 3,300 kg. Looking at Figure 7(a), it can be seen that when the gable span is approximately 6.9 m, the support reaction force is approximately 100 kN / m, which is smaller than that of Example 1 but exceeds that of the comparative example (approximately 50 kN / m). This is because the use of the corner connecting piece 6 improves the fixation of the projected corner 5 formed by one wale 2 and the other wale 3 compared to the comparative example, and the bending moment at the center of the span is significantly reduced for both the one wale 2 and the other wale 3, resulting in a larger support reaction force that can be withstood. Furthermore, the number of bolts required to install the reaction-resisting members (corner connecting pieces 6) at each of the four projected corners 5 is a total of 80, the same as in Example 1.

[0072] As a result, if the earth retaining support structure 1 using the corner connecting pieces 6 is adopted instead of the earth retaining support structure 1' of the comparative example, it becomes possible to reduce the size of the one wale 2 and the other wale 3 as in Example 2. Therefore, the material costs for the earth retaining support structure 1 can be significantly reduced, which can contribute to further reduction in construction costs.

[0073] The earth retaining support structure 1 and corner connecting pieces 6 of the present invention are not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0074] For example, in this embodiment, H-shaped steel is used as the main member 7 of the corner connecting piece 6, but this is not necessarily limited to this. For example, as shown in Fig. 8(a), a material that is generally used as a cross member such as a truss member can be appropriately used as the main member 7. Note that Fig. 8(a) shows an example in which three types of corner connecting pieces 6 using truss members as the main member 7, each with a different length, are prepared, arranged in parallel, and connected by connecting means 61.

[0075] In addition, in this embodiment, as shown in Fig. 2, an example has been given in which one main member 7 is provided for one corner connecting piece 6, but, for example, as shown in Fig. 8(b), a configuration in which multiple main members 7 are arranged in parallel for one corner connecting piece 6 may also be used. In this case, the multiple main members 7 may be in contact with each other or may be arranged with intervals between them. [Explanation of symbols]

[0076] 1 Earth retaining support structure 1' Earth retaining support structure (comparison example) 12 Tensile-resistant joint structure 13 Shear-resistant joint structures 2 One-sided belly upright 21 Web 22 flange 23 End plate 24 volts 25 through holes 3. Other belly upright 31 Web 32 flange 33 End plate 34 Block material 35 through hole 4 struts 5. Corner 6 Corner joint pieces 61 Connection means 62 One end side 63 Other end side 7 Main material 71 Web 72 flange 721 Bolt holes 8 Tensile Resistance Plate 81 long hole 82 volts 83 Clamping fittings 9 Shear resistance plate 91 Round hole 92 volts P earth pressure R retaining wall C. Concrete 50 Excavation Area 51 Retaining wall 52 Belly Raising 53 Corner 54 Corner piece 55 Corner Flint Beam 551 Main flint material 552 Flint piece

Claims

1. An earth retaining support structure that stiffens an earth retaining wall, A corner joint piece is disposed at a projected corner formed by butting an end face of one wale against a side face of the other adjacent wale on the same plane, Of the two ends of the corner connecting piece, A tension-resistant connecting structure is provided on one end side, which can resist the tension force generated between the one wale raised portion that is abutted against the side surface of the other wale raised portion, but which does not have a mechanism for resisting shear force; A shear-resistant connection structure capable of resisting tensile and shear forces occurring between the end surface of one of the wales and the other wales that are abutted against each other is provided on the other end side, The tension-resistant coupling structure is a slot provided on one end side of the corner connecting piece; a through hole provided in one of the wales that is abutted against a side surface of the other wale; a fastening member passing through the through hole and the elongated hole; An earth retaining support structure characterized by comprising:

2. A corner connecting piece used in the earth retaining support structure described in claim 1, A trapezoidal main member bridged between the one wale and the other wale; a tension resistance plate fixed to one end of the main material in the longitudinal direction and having the long hole formed therein; A corner connecting piece comprising:

3. In the corner connecting piece according to claim 2, A plurality of the main materials having different lengths are arranged in parallel, and A corner connecting piece characterized in that the tension resistance plate is provided across a plurality of the main members.

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