Fixing device and steel sheet pile head fixing structure

Abstract

To provide a fixing device and a fixing structure for a head of a steel sheet pile, which can be attached without damaging the steel sheet pile, does not require welding, and has a high effect of preventing displacement of a joint part of the steel sheet pile. [Solution] A fixing device 20 for the head of a steel sheet pile that can be attached and detached to the flange 12 of the steel sheet piles 10a, 10b, and is equipped with a contact plate 21 that can be positioned across the upper end faces 14, 14 of adjacent steel sheet piles 10a, 10b while spanning the joint parts of the steel sheet piles 10a, 10b, a pair of clamping legs 22, 22 that protrude opposite each other from the underside of the contact plate 21, and a fixing bolt 23 that is screwed into the clamping legs 22.

Description

[Technical Field]

[0001] The present invention relates to a fixing device and a fixing structure for a steel sheet pile head that fixes the head of a steel sheet pile without welding. [Background technology]

[0002] Typical steel sheet piles used in earth retaining construction have a U-shaped or hat-shaped cross section, and the steel sheet piles are installed by fitting the joints formed on both ends into each other. As the excavation proceeds in front of the steel sheet pile wall, the earth pressure on the steel sheet pile increases, and this earth pressure acts on the head of the steel sheet pile as a deflection toward the excavation surface. Before the struts are installed, if the steel sheet piles bend toward the excavation surface due to earth pressure, a "shift" occurs at the joints of the steel sheet piles, reducing the moment of inertia. In order to prevent "displacement" of the joints of the steel sheet piles, it has been known to fix the joints at the head of the steel sheet piles by welding over a range of about 500 mm.

[0003] Furthermore, Patent Document 1 discloses that a joint at the head of a steel sheet pile is fixed using a fixing metal fitting. This fixing bracket is equipped with a gate-shaped bracket body that can be installed across the joint part of the steel sheet pile, and eight tightening bolts that are screwed into the bracket body in all four directions.After the bracket body is placed across the joint part of the steel sheet pile from above, the eight orthogonal tightening bolts are abutted against the sides of the joint part and tightened, increasing the frictional force of the joint part and preventing the joint part from "slipping." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-101394 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology of welding and fixing the joints at the head of steel sheet piles involves the following problems. <1> It takes about 20 minutes to weld one spot, so fixing the head of the steel sheet pile takes time and the work is inefficient. <2> Not only is it difficult to secure welders, but the quality of the welding is likely to vary depending on the weather and the skill of the craftsman. <3> When removing the steel sheet piles, it is necessary to cut off the welded area at the head of the steel sheet piles. Therefore, if the total length of the removed steel sheet pile is shorter than the specified dimension, it will be treated as scrap, which is uneconomical, and it is also uneconomical to extend the total length of the steel sheet pile in advance to take into account the amount of removal.

[0006] The conventional technique for fixing the joints of steel sheet piles using fixing metal fittings involves the following problems. <1> Because the joints of steel sheet piles are formed from steel plates, it is difficult to deform the joints using the tightening force of the tightening bolts. Therefore, when the steel sheet pile stands upright, the fixing force at the joints of the steel sheet pile is insufficient, and the joints are likely to become misaligned. <2> When a large tightening force is applied to a part of the joint of a steel sheet pile by a tightening bolt, the joint of the steel sheet pile is partially deformed. If the joints are deformed or damaged, the removed steel sheet piles cannot be reused. <3> To ensure a high tightening force, high tension bolts must be used, which not only increases the cost of the fixing hardware, but also requires a lot of effort and time to tighten the eight tightening bolts. <4> The height of the tops of the steel sheet piles installed in a row is not uniform, resulting in height differences. Conventional fixing brackets are installed by dropping the gate-shaped bracket body from above the steel sheet pile and spanning the joint part. Therefore, in areas where there is a large difference in elevation between the top ends of the steel sheet piles, the fixing bracket cannot reach the joint part of the steel sheet pile, making it impossible to secure the joint part with the fixing bracket.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a fixing device and a fixing structure for a steel sheet pile head that can solve the above-mentioned problems. [Means for solving the problem]

[0008] The present invention provides a fixing device for a steel sheet pile head that is detachable from a flange of a steel sheet pile on either the excavation side or the natural ground side, the steel sheet pile being installed by fitting together joints formed at both ends of the steel sheet pile, the fixing device comprising: a backing plate that can be arranged across the joints of the steel sheet piles and across the upper end surfaces of adjacent steel sheet piles; a plurality of clamping legs that are provided opposite to each other on the underside of the backing plate and form a housing space that can be fitted onto the flange of the steel sheet pile; and fixing bolts that are threaded through the clamping legs and that can clamp the side surfaces of the flange of the steel sheet pile by pressing the bolt tips. The lower half of the clamping leg is formed with an excess length portion that can come into contact with the step surface of the joint of the steel sheet pile. . In another embodiment of the present invention, a pair of clamping legs may be provided protruding at a distance from one end of the underside of the support plate, or two sets of clamping legs, each consisting of a pair of clamping legs, may be provided protruding at a distance from both ends of the underside of the support plate. In another aspect of the present invention, a single fixing bolt may be screwed onto each of the pair of opposing clamping legs, and a side surface of the flange of the steel sheet pile may be clamped by the pair of fixing bolts. Alternatively, a single fixing bolt may be screwed onto one of the pair of opposing clamping legs, and a protrusion may be provided on the other of the pair of opposing clamping legs, and a side surface of the flange of the steel sheet pile may be clamped by the fixing bolt and the protrusion. 。 Book The invention is a fixing structure for a steel sheet pile head, in which the head of the steel sheet pile is fixed using a fixing device that can be attached and detached to the flange of either the excavation side or the ground side of the steel sheet pile, which is installed by fitting together joints formed at both ends of the steel sheet pile.The fixing device is used, and multiple clamping legs of the fixing device are attached to the flange of the steel sheet pile, while the lower surface of the contact plate covers the upper end surface of the steel sheet pile.Fixing bolts threaded into the clamping legs are tightened to clamp the side of the flange of the steel sheet pile, thereby positioning the fixing device so that it cannot be displaced, and the upper end surface of the steel sheet pile abuts against the contact plate of the fixing device fixed to the flange of the steel sheet pile, thereby regulating the upward displacement of the steel sheet pile acting on the contact plate. In another embodiment of the present invention, the fixing device may be attached to either the flange of the steel sheet pile on the excavation side or the flange of the steel sheet pile on the natural ground side. [Effects of the Invention]

[0009] The present invention has at least one of the following effects. <1> Since the heads of the steel sheet piles can be fixed without welding and misalignment of the joints can be prevented, all of the problems inherent in welding fixing techniques, such as workability, securing welders, differences in welding quality, and scrapping of the steel sheet piles, can be resolved. <2> The fixing device of the present invention can obtain a reaction force from the flange of the steel sheet pile, and can reliably restrict the upward displacement of the steel sheet pile abutting against the abutment plate of the fixing device. Therefore, compared to conventional fixing fittings that directly fasten the joint part of the steel sheet pile with multiple bolts, the fixing device of the present invention is highly effective in preventing the steel sheet pile from slipping, and there is no risk of damaging the joint part of the steel sheet pile. <3> Compared with conventional fastening fixtures, the present invention can improve the workability of attachment and detachment by greatly reducing the number of bolts used, and can reduce the cost of the fastening device by using inexpensive normal bolts instead of expensive high-tension bolts. <4> The fixing device of the present invention can be attached to either the excavation side or the ground side of the steel sheet pile, and can therefore be used to prevent the joints of the steel sheet pile from shifting not only when the steel sheet pile is self-supporting, but also when support is being used. <5> Even if there is a difference in height between the upper end surfaces of adjacent steel sheet piles, the fixing device can be attached to the flange of the steel sheet pile and used by adjusting the mounting height of the fixing device relative to the flange of the steel sheet pile or by inserting a filler member between the contact plate and the top surface of the flange. Therefore, it is highly adaptable to on-site installation of steel sheet piles, where uniform construction is not possible. <6> By providing an excess length in the lower half of the clamping leg and abutting this excess length against the step surface of the joint of the steel sheet pile, the free rotation of the fixing device around the fixing bolt can be restricted, and when used in combination with the clamping force of the fixing bolt, the fixing device's effectiveness in preventing slippage of the joint of the steel sheet pile is further enhanced. <7> When two sets of clamping legs are installed side by side at both ends of the underside of the support plate, it can be fixed to the two flanges of the steel sheet pile on the excavation side and the ground side through the two sets of clamping legs, so that the upward displacement force of the steel sheet pile acting on the support plate can be distributed and supported by the two flanges of the steel sheet pile on the excavation side and the ground side. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a head of a steel sheet pile to which a fixing device according to the present invention is installed; [Figure 2] Plan view of Figure 1 [Figure 3] Cross section of III-III in Figure 2 [Figure 4] FIG. 1 is a perspective view of a fixing device according to a first embodiment of the present invention; [Figure 5] An explanatory diagram of the fixing effect of the fixing device on the steel sheet pile [Figure 6A] An explanatory diagram of an example of how to use a fixing device when there is a difference in height on the top surface of a steel sheet pile [Figure 6B] An explanatory diagram of an example of how to use a fixing device when there is a difference in height on the top surface of a steel sheet pile [Figure 7] An explanatory diagram of a modified example of a fixing means for a steel sheet pile by combining a fixing bolt and a protrusion [Figure 8A] 10 is a perspective view of a fixing device according to a second embodiment of the present invention; [Figure 8B] An explanatory diagram of the fixing action of the steel sheet pile by the fixing device according to Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in detail below with reference to the drawings. [Example]

[0012] <1> steel sheet pile The steel sheet pile 10 will be described with reference to FIGS.

[0013] In this example, a steel sheet pile 10 is a U-shaped steel sheet pile having flanges 12 on both ends of a web 11 and joints 13 formed at the ends of the flanges. The joint 13 has a curved claw portion 13a and a dovetail-shaped fitting groove 13b formed inside the claw portion 13a, so that the joints 13, 13 can be connected by fitting together. In the present invention, the fitting portion of the joints 13, 13 of adjacent steel sheet piles 10, 10 is defined as a joint portion.

[0014] <2> Fixation device The description will be made with reference to Figures 1 to 5. The fixing device 20 for the head of a steel sheet pile according to the present invention is used by being detachably fixed to the flange 12 of the steel sheet pile 10 on either the excavation side or the natural ground side driven into the ground. The fixing device 20 illustrated in this example comprises a contact plate 21 that can be positioned across the upper end faces 14, 14 of adjacent steel sheet piles 10, 10, a pair of clamping legs 22, 22 protruding at a distance from the underside of the contact plate 21, and two fixing bolts 23, 23 screwed into each clamping leg 22.

[0015] <2.1>This board The contact plate 21 is a pressing plate having a size that allows it to be placed across the upper end faces 14, 14 of adjacent steel sheet piles 10, 10. In this example, the planar shape of the contact plate 21 is rectangular, but there is no particular limitation on the planar shape of the contact plate 21.

[0016] <2.2> A pair of clamping legs The pair of clamping legs 22, 22 are load transmission members that can be mounted on the flange 12 of the steel sheet pile 10 by straddling the flange 12. The pair of clamping legs 22, 22 are positioned parallel to each other with a gap therebetween, and one end (upper end) thereof is integrally fixed to the rear surface of the contact plate 21 by welding or the like. The plate surface of each clamping leg 22 has a bolt hole 22a at the same position.

[0017] <2.2.1> Containment space Between the pair of clamping legs 22, 22, an accommodation space 25 capable of accommodating the flange 12 of the steel sheet pile 10 is formed.

[0018] <2.2.2> Overall length of clamping legs The overall length of the pair of clamping legs 22, 22 can be selected as appropriate, but in practice a length of about 20 to 30 cm is sufficient. The overall length of the clamping legs 22 is increased so that when there is a difference in height between the upper end faces 14, 14 of adjacent steel sheet piles 10, 10, the fixing device 20 can be installed without being affected by the difference in height between the upper end faces 14, 14.

[0019] <2.2.3> Extra length A bolt hole 22a is formed in the approximate center of the clamping leg 22, and an extra length portion 22b is formed in the clamping leg 22 below the bolt hole 22a. The excess length 22b is formed in the lower half of the clamping leg 22 so that the tip of the excess length 22b abuts against the raised step surface of the joint 13 of the steel sheet pile 10, thereby restricting the free rotation of the fixing device 20 around the fixing bolt 23. The extra length portion 22b is not essential and can be omitted.

[0020] <2.2.4> Position of clamping legs against the contact plate The positions at which the clamping legs 22, 22 protrude relative to the contact plate 21 can be selected as appropriate. For example, a pair of clamping legs may be provided protruding from the center of the contact plate 21, but this would increase the size of the contact plate 21. In order to reduce the size of the contact plate 21, it is advisable to install the clamping legs 22, 22 at a position biased to either the left or right side of the contact plate 21.

[0021] <2.3> Fixing bolt The fixing device 20 of the present invention comprises two fixing bolts 23 . The fixing device 20 can be fixed to the flange 12 of the steel sheet pile 10 by tightening two fixing bolts 23 screwed into the bolt holes 22 a of each clamping leg 22 in a facing relationship.

[0022] [Method of fixing the head of a steel sheet pile using a fixing device] A method for fixing the head of the steel sheet pile 10 using the fixing device 20 will be described with reference to FIGS. In the following explanation, the steel sheet piles 10 that have already been cast will be distinguished as follows: the steel sheet pile farthest from the excavation side will be referred to as the "ground-side steel sheet pile 10a" and the steel sheet pile closer to the excavation side will be referred to as the "excavation-side steel sheet pile 10b." Furthermore, the upper end surfaces of the ground-side steel sheet pile 10a and the excavation-side steel sheet pile 10b will be distinguished as 14a and 14b, respectively.

[0023] 1. When there is no difference in height at the joint of the steel sheet pile In this example, a configuration will be described in which the upper end faces 14a, 14b of the steel sheet piles 10a, 10b after driving are at approximately the same height, and there is no height difference at the joint portion.

[0024] <1> Fixing device exterior set

[0025] While holding the fixing device 20 by hand, the pair of clamping legs 22, 22 are fitted onto the flange 12 of the steel sheet pile 10a on the ground side and are clamped into the accommodation space 25.

[0026] At this time, the installation position of the fixing device 20 is adjusted so that the contact plate 21 of the fixing device 20 is positioned across both adjacent steel sheet piles 10a, 10b, and the clamping legs 22 of the fixing device 20 are positioned close to the joint portion.

[0027] By attaching the clamping legs 22, 22 of the fixing device 20 to the flange 12 of the steel sheet pile 10a on the ground side, the lower surface of the contact plate 21 abuts against the upper end surfaces 14a, 14b of both steel sheet piles 10a, 10b with the joint 13 sandwiched between them, and the tips of a pair of fixing bolts 23, 23 are positioned opposite both side surfaces of the flange 12 of the steel sheet pile 10a on the ground side.

[0028] <2> Tightening the fixing bolts Next, the two fixing bolts 23 are tightly tightened to fix the fixing device 20 to the steel sheet pile 10a on the natural ground side so that it cannot be displaced. The work of fixing the heads of both steel sheet piles 10a and 10b is completed by installing the contact plate 21 of the fixing device 20 fixed to the steel sheet pile 10a on the excavation side across the upper end faces 14a and 14b of both steel sheet piles 10a and 10b.

[0029] In this way, in the present invention, after placing the fixing device 20 across the joint portion of adjacent steel sheet piles 10a, 10b, the fixing device 20 can be installed in a fixed state so that it cannot be displaced by the simple operation of tightening two pairs of fixing bolts 23.

[0030] <3> Prevents displacement of steel sheet pile joints As the excavation of the ground inside the steel sheet piles 10a, 10b progresses, the earth pressure on the free-standing steel sheet piles 10a, 10b increases, and the earth pressure acts on the heads of the steel sheet piles 10a, 10b as a bending force toward the excavation surface. As a result, a downward displacement force is applied to the steel sheet pile 10a on the natural ground side, and an upward displacement force is applied to the steel sheet pile 10b on the excavation side, causing a "gap" at the joint between the two steel sheet piles 10a, 10b.

[0031] When a displacement force is generated in the direction of the steel sheet pile 10b on the excavation side, the upper end surface 14b of the steel sheet pile 10b abuts against the lower surface of the contact plate 21 of the fixing device 20 and tries to push up the contact plate 21. This upward displacement force is supported by the contact plate 21 of the fixing device 20, the pair of clamping legs 22, 22, and the two fixing bolts 23, 23, and finally by the flange 12 of the steel sheet pile 10a on the natural ground side. That is, the rigidity of the contact plate 21 of the fixing device 20 and the fixing force of the pair of fixing bolts 23, 23 can effectively suppress the upward displacement of the steel sheet pile 10b on the excavation side.

[0032] In particular, the excess length 22b formed in the lower half of the clamping leg 22 abuts against the step portion of the joint 13 of the steel sheet pile 10, thereby restricting the free rotation of the fixing device 20 around the fixing bolt 23, so that even if a cantilever structure fixing device 20 is used, the upward displacement force acting on the free end side of the contact plate 21 of the fixing device 20 can be reliably supported.

[0033] As described above, in the present invention, the fixing device 20 installed across the joint portion of the adjacent steel sheet piles 10a, 10b can effectively prevent the occurrence of misalignment at the joint portion of the steel sheet piles 10a, 10b. This eliminates the need for on-site welding work, as was previously required.

[0034] <4> Erection of support structures With the fixing device 20 preventing the joints of the steel sheet piles 10a, 10b from shifting, supports are erected in the space on the excavation side using known web members and struts. By erecting supports on the steel sheet piles 10a and 10b, deflection deformation of the steel sheet piles 10a and 10b toward the excavation side is restrained. After the support structure is erected, the fixing device 20 may be removed or may be left behind on the steel sheet piles 10a, 10b. By erecting the support structure, a displacement force acts in the opposite direction to that when the steel sheet piles 10a, 10b are standing on their own, so the fixing device 20 fixed to the steel sheet pile 10a on the ground side can be easily removed by simply loosening the two fixing bolts 23, 23.

[0035] <5> Replacing the fixing device When the steel sheet piles 10a, 10b are pressed toward the ground via the support, the steel sheet piles 10a, 10b are flexed and deformed toward the ground, which may cause "displacement" at the joints. Therefore, by removing the fixing device 20 attached to the steel sheet pile 10a on the natural ground side and replacing it with the steel sheet pile 10b on the excavation side, it is possible to prevent "displacement" of the joint portion.

[0036] When replacing the fixing device 20, the fixing bolts 23, 23 are loosened and the fixing device 20 attached to the steel sheet pile 10a on the natural ground side is removed. The removed fixing device 20 can be simply turned around 180 degrees and reattached to the web 11 of the steel sheet pile 10b on the excavation side.

[0037] When replacing the fixing device 20, the contact plate 21 of the fixing device 20 is placed across both adjacent steel sheet piles 10a, 10b, and the clamping legs 22 of the fixing device 20 are positioned close to the joint portion.

[0038] 2.When there is a difference in height at the joint of the steel sheet pile With reference to FIG. 6, a configuration in which there is a difference in height between the upper end faces 14a, 14b of adjacent steel sheet piles 10a, 10b will be described.

[0039] <1> When the steel sheet pile on the excavation side is higher than the excavation ground side FIG. 6(A) shows a case where the upper end face 14b of the steel sheet pile 10b on the excavation side is located at a higher position than the upper end face 14a of the steel sheet pile 10a on the natural ground side. In such a case, when attaching the pair of clamping legs 22, 22 of the fixing device 20 to the web 11 of the steel sheet pile 10a on the ground side, the underside of the contact plate 21 of the fixing device 20 can be abutted only against the upper end surface 14b of the steel sheet pile 10b on the excavation side, and the underside of the contact plate 21 can be attached away from the upper end surface 14a of the steel sheet pile 10a on the ground side.

[0040] Even if the underside of the contact plate 21 is not in contact with the upper end surface 14a of the steel sheet pile 10a on the ground side, the load can be transmitted through the contact plate 21, the clamping legs 22, 22 and the fixing bolts 23, 23, thereby effectively preventing "misalignment" from occurring at the joint between the two steel sheet piles 10a, 10b.

[0041] <2> When the steel sheet pile on the excavation side is lower than the excavation ground side FIG. 6(B) shows a case where the upper end face 14b of the steel sheet pile 10b on the excavation side is located at a lower position than the upper end face 14a of the steel sheet pile 10a on the natural ground side. In such a case, when attaching a pair of clamping legs 22, 22 of the fixing device 20 to the web 11 of the steel sheet pile 10a on the ground side, the lower surface of the contact plate 21 of the fixing device 20 is abutted only against the upper end surface 14a of the steel sheet pile 10a on the ground side.

[0042] Although there is a gap between the underside of the contact plate 21 and the upper end surface 14b of the steel sheet pile 10b on the excavation side, load transmission is possible by interposing a filler member 30 capable of transmitting load between the underside of the contact plate 21 and the upper end surface 14b of the steel sheet pile 10b on the excavation side.

[0043] Therefore, even if there is a gap between the underside of the contact plate 21 and the upper end surface 14b of the steel sheet pile 10b on the excavation side, the use of the filler member 30 can effectively prevent "misalignment" at the joint between the two steel sheet piles 10a, 10b.

[0044] 3. Applicability to hat-shaped steel sheet piles The application of the fixing device 20 according to the present invention is not limited to the U-shaped steel sheet pile 10 described above, but can also be applied to a hat-shaped steel sheet pile.

[0045] [Variations] In the previous Example 1, a configuration was described in which the fixing device 20 is detachably fixed to the web 11 of the steel sheet pile 10 by tightening a pair of fixing bolts 23, 23, but the fixing means of the fixing device 20 is not limited to this configuration.

[0046] <1> Modification of the fixing means of the fixing device Referring to FIG. 7, another fixing means in which one fixing bolt 23 and protrusion 24 are combined will be described. A fixing bolt 23 is screwed into one of the pair of clamping legs 22, 22, and a protrusion 24 is provided on the inner surface of the other clamping leg 22 of the pair of clamping legs 22, 22.

[0047] <2> How to attach to the web With the web 11 of the steel sheet pile 10 positioned between the opposing protrusions 24 and the fixing bolts 23, the fixing bolts 23 are tightened to press the tips of the protrusions 24 and the fixing bolts 23 against both sides of the web 11 and fix them.

[0048] <3> Effects of this example In this example, in addition to the effects of the previous Example 1, only one fixing bolt 23 is required to be equipped to the fixing device 20, which not only reduces the cost of the fixing device 20 but also reduces the rotation work of the fixing bolt 23 when fixing it by half. [Example]

[0049] <1> Fixation device Another fixation device 20 will now be described with reference to Figures 8A and 8B. The fixing device 20 of this example comprises a contact plate 21 that can be positioned across the upper end surfaces 14, 14 of adjacent steel sheet piles 10a, 10b, two pairs of clamping legs 22, 22 that protrude at a distance from the underside of the contact plate 21 (two pairs of clamping legs 22, 22 if considered as one set), and two fixing bolts 23, 23 that are screwed into each clamping leg 22. The two pairs of clamping legs 22, 22 are provided to protrude from the contact plate 21 in the longitudinal direction at a distance from each other. A total of four clamping legs 22 are provided on the underside of the contact plate 21 so as to protrude therefrom.

[0050] The reason why two pairs of clamping legs 22, 22 are provided on the underside of the contact plate 21 is that the clamping legs 22, 22 are used to fix the contact plate 21 to the flanges 12 of the adjacent steel sheet piles 10a, 10b.

[0051] <2> How to use the fixation device A fixing device 20 is arranged across the joints of adjacent steel sheet piles 10a, 10b, and two sets of clamping legs 22, 22 protruding from the underside of the fixing device 20 are fitted onto the flanges 12 of the steel sheet piles 10a, 10b, respectively. The clamping legs 22, 22 are fixed by tightening the fixing bolts 23 provided thereon.

[0052] <3> Effects of this example In this example, in addition to the effects of the previous Example 1, the fixing device 20 can be firmly fixed across the flanges 12, 12 of the steel sheet piles 10a, 10b through two sets of clamping legs 22, 22 arranged side by side on the underside of the fixing device 20 and the fixing bolts 23. In this example, the clamping legs 22 are provided at positions away from the joints of the steel sheet piles 10, 10, so that the extra length portions 22b of the clamping legs 22 can be omitted and the overall length of the clamping legs 22 can be shortened. [Explanation of symbols]

[0053] 10...Steel sheet pile 10a: Steel sheet pile on the ground side 10b Steel sheet pile on the excavation side 11. Web 12. Flange 13. Joint 13a···Claw part of joint 13b.... Fitting groove of joint 14...Top end surface 20...Fixing device 21...Touching board 22...Pinching leg 22a Bolt hole 22b...Extra length 23 Fixing bolt 24... Protrusion 25. Storage space 30 Filler material

Claims

1. A fixing device for a steel sheet pile head that can be attached to or detached from a flange of a steel sheet pile on either the excavation side or the ground side, the flange being installed by fitting joints formed at both ends of the steel sheet pile together, a contact plate that can be arranged across the joint portions of the steel sheet piles and across the upper end surfaces of the adjacent steel sheet piles; a plurality of clamping legs provided opposite to each other on the underside of the contact plate and forming an accommodation space that can be fitted onto the flange of the steel sheet pile; a fixing bolt that penetrates the clamping leg and is screwed into the clamping leg, and that can clamp a side surface of the flange of the steel sheet pile by pressing a tip portion of the bolt, The lower half of the clamping leg is formed with an excess length portion that can come into contact with a step surface of the joint of the steel sheet pile. Fixation device.

2. 2. The fixing device according to claim 1, wherein a pair of clamping legs are provided at one end of the lower surface of said contact plate, said clamping legs being spaced apart from one another.

3. 2. The fixing device according to claim 1, wherein two pairs of clamping legs, each consisting of a pair of clamping legs, are provided at opposite ends of the lower surface of said contact plate at a distance from each other.

4. 3. The fixing device according to claim 2, wherein a single fixing bolt is screwed into each of the pair of opposing clamping legs, and the pair of fixing bolts are configured to clamp a side surface of the flange of the steel sheet pile.

5. 3. The fixing device according to claim 2, wherein a single fixing bolt is screwed into one of the pair of opposing clamping legs, and a protrusion is provided on the other of the pair of opposing clamping legs, so that the fixing bolt and the protrusion can clamp the side of the flange of the steel sheet pile.

6. A fixing structure for a steel sheet pile head, in which a steel sheet pile head is fixed to a flange of either one of the steel sheet piles on the excavation side or the ground side by using a detachable fixing device, wherein the steel sheet pile head is fixed to the flange of either one of the steel sheet piles on the excavation side or the ground side by fitting the joints formed at both ends of the steel sheet pile together, Using the fixing device according to claim 1, a plurality of clamping legs of the fixing device are fitted to the flange of the steel sheet pile, and a lower surface of the contact plate covers an upper end surface of the steel sheet pile; The fixing device is positioned so as to be unable to be displaced by fastening fixing bolts threadedly attached to the clamping legs to clamp the side surfaces of the flanges of the steel sheet piles, an upper end surface of the steel sheet pile abuts against a contact plate of the fixing device fixed to a flange of the steel sheet pile, thereby restricting upward displacement of the steel sheet pile acting on the contact plate; Steel sheet pile head fixing structure.

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