JP5353778B2 - Steel sheet pile and steel sheet pile wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel sheet pile which can ensure quality by preventing a crack etc. from being formed by designating part welded to the steel sheet pile as a starting position, even when connecting members are not vertically joined and welded together; and to provide a steel sheet pile wall structure. <P>SOLUTION: The connecting members 4 comprise upside and downside connecting members 4A and 4B which are vertically juxtaposed with at least one vertical joint portion 6 in a longitudinal direction of a steel sheet pile body 20 in between. The connecting members 4 are welded and fixed to the sheet pile body 20 by intermittent welding or continuous welding in a state in which a weld fixing end 7A at the lowermost end of the upside connecting member 4A is separated from the vertical joint portion 6 and in which a weld fixing end 7B at the uppermost end of the downside connecting member 4B is separated from the vertical joint portion 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a steel sheet pile and a steel sheet pile wall structure used as a structural member in the civil engineering / architecture field, and in particular, a steel sheet pile to which a connection member is attached, and adjacent steel sheet piles are connected to each other via a connection member. The present invention relates to a steel sheet pile wall structure.

  Conventionally, a steel sheet pile is connected via a connection member in a wall constructed by forming a connection angle equal to or greater than a rotation angle that can be fitted between steel sheet piles having different joint cross-sectional shapes or at a steel sheet pile joint portion. (For example, refer nonpatent literatures 1 and 2). Such a connection member is attached by welding in the vertical direction along the side edge or side surface of one steel sheet pile, and the joint of the other steel sheet pile is directed upward with respect to the joint for connection of the connection member. It is provided with the function which connects one and the other steel sheet piles by making it slide toward the lower direction and fitting.

Arcelor, "Arcelor-Steel Sheet Piling HZ Steel Wall System-" (Luxembourg) 2007, p.28 Maruto Sheet Pile Co., Ltd., “MARUFUJI – Peace Corner FSP-5L Exclusive Corner”, p.2

By the way, depending on the attachment method of the connecting member, separation at the time of placing due to insufficient welding or thermal deformation due to excessive welding has been pointed out conventionally, but as a recommended attachment method, for example, in Non-Patent Document 1, It is shown that the head and pile tip are attached by continuous welding over the upper and lower ends of 500 mm. However, the attachment method according to the construction method is not shown, and the welded portion of the connection member may fall short of the proof stress particularly in the construction subjected to vibration or impact.
In addition, when the connecting members are arranged in the vertical direction, if the upper and lower ends of the connecting member are grooved, the connecting member is vertically connected by welding, so that a groove processing cost is generated. There was a problem. On the other hand, it is also generally performed that the connecting member is welded and attached to the side edge or side surface of the steel sheet pile without welding the connecting position of the connecting member without welding the connecting member. However, during the placement of the steel sheet pile by the vibration method, cracks occur in the welded part starting from the welded part at the longitudinal connection position of the connecting member, and the connecting member having the longitudinally connected part is a steel sheet pile. There is a possibility that it will become more detached and impossible to place. Furthermore, due to the concentrated load acting on the welded portion at the longitudinal position by the driving load, the tensile load is transmitted to the steel sheet pile, causing cracks in the steel sheet pile base material and reducing the quality. Sometimes

  An object of the present invention is a steel sheet pile capable of ensuring quality by preventing cracks and the like starting from a welded portion with a steel sheet pile at the time of casting even when connecting members are not cascade-welded. And to provide a steel sheet pile wall structure.

In order to achieve the above-mentioned object, the applicant of the present invention conducted a steel sheet pile mounting test with a connecting member attached thereto, and obtained the following knowledge from this driving test.
That is, when the connecting member including the longitudinal position is attached to the steel sheet pile by welding without performing groove processing on the connecting member, the inertial force of the connecting member at the time of placing is the longitudinal position of the welded portion. It has been found that stress concentration is caused by intensively acting on the weld and cracks are generated in the welded portion at the longitudinal joint position, which is the main cause of the connection member separating from the steel sheet pile.
In addition, the inertial force of the connecting member at the time of placement acts intensively, causing stress concentration and transmitting it to the steel sheet pile via the weld, and the tensile load decreases the crack strength due to the thermal effect of welding. It has also been clarified that the steel sheet pile base material is cracked to exceed the strength of the steel sheet pile base material.

Specifically, as shown in FIG. 6, the connecting member 400 is attached to the side surface of the steel sheet pile 200 including the longitudinal connection position 600 by the welded portion 700 without performing the groove processing, and the connecting member 400 is attached. When the steel sheet pile 200 was driven by the vibration method, the state of the base material of the welded portion 700 of the connection member 400 and the steel sheet pile 200 was verified. FIG. 6 shows a schematic diagram of the situation of the placement by the vibration method and the balance of forces of the connecting member 400.
Focusing on the force balance relationship for the connecting member 400, the connecting member 400 repeatedly vibrates at an amplitude A (mm) and vibration angular velocity ω (rad / s) in the vertical direction by the vibration method. The maximum inertia force F to be generated is as follows.
F = mAω ² (N)
here,
F: Maximum inertia force (N) generated in the connecting member
m: mass of the connecting member (kg)
A: Amplitude of the connecting member (mm)
ω: angular velocity of the connecting member (rad / s)

As shown in FIG. 6 (B), the maximum inertia force F acts on the point P of the welded portion 700 that joins the connecting member 400 and the steel sheet pile 200 intensively to generate the crack C1 of the welded portion 700. Connected. Further, when concentrated stress is generated in the welded portion 700 due to the maximum inertial force F, a tensile load acts on the base material of the steel sheet pile 200 integrated with the welded portion 700 as shown in FIG. It has been clarified from the knowledge of the casting test that the stress concentration is large enough to cause the welded portion 700 to crack, and accordingly, the base material of the steel sheet pile 200 having a lower tensile strength than the welded portion 700. In this case, a crack C2 of the base material occurs.
The present invention has been devised by paying attention to the inertial force F at the time of placing by the vibration method as described above, and its configuration is shown below.

The steel sheet pile of the present invention is a steel sheet pile having a steel sheet pile main body and a connecting member attached to the side edge or side surface of the steel sheet pile main body by welding, and does not cascade weld the connecting members . The connecting member is configured to have an upper connecting member and a lower connecting member that are arranged side by side across at least one longitudinal joint along the longitudinal direction of the steel sheet pile main body, While the lowermost welding toe portion of the upper connecting member is separated from the longitudinal joint portion, the uppermost welding toe portion of the lower connection member is separated from the longitudinal joint portion, The connection member is welded and fixed to the steel sheet pile main body by intermittent welding or continuous welding , a separation distance between the lowest weld toe portion of the upper connection member and the longitudinal joint portion, and the lower connection member The uppermost weld toe and the longitudinal joint Distance, the set to the connection member and the above leg weld for welding said steel sheet pile body, the lower limit of the distance is characterized in that there is a higher 5 mm.

According to the present invention described above, intermittent welding or continuous welding is performed in a state where the lowermost welding toe portion of the upper connecting member and the uppermost welding toe portion of the lower connecting member are separated from the longitudinal joint portion, respectively. By fixing the connecting member to the steel sheet pile main body by welding, stress concentration can be avoided without the inertial force of the connecting member acting on one point of the welded portion. Furthermore, the inertial force generated in the upper connecting member can be prevented from detaching the upper connecting member without stress concentration because the welded portion bears in a linear state in the vertical direction instead of a single point. Similarly, the lower connection member can be prevented from being detached.
In addition, since a tensile load that causes cracks in the weld due to stress concentration does not occur, the tensile load transmitted to the base material of the steel sheet pile main body can be suppressed, and the occurrence of cracks in the base material can be prevented.
Furthermore, in the steel sheet pile of the present invention, by setting the distance between the weld toe portion and the longitudinal joint portion of the upper connection member and the lower connection member to be equal to or longer than the leg length of the weld portion, it is possible to perform normal welding work. Even when the connecting member is welded to the steel sheet pile main body, the welded portion does not overlap the longitudinal joint portion, and the occurrence of cracks starting from the welded portion can be reliably prevented.

At this time, in the steel sheet pile of the present invention, the steel sheet pile main body is constituted by at least a pair arranged vertically, and the pair of upper and lower steel sheet pile main bodies are welded to each other at the main body longitudinal joint portion, and the connection It is preferable that the longitudinal joint portion of the member is provided at a predetermined distance apart from the main body longitudinal joint portion by a predetermined distance, and the predetermined distance is 10 mm or more .
Here, since the pair of upper and lower joints in the steel sheet pile main body are not welded to each other, the vertical joint of the main body is restrained in the vertical vibration by welding joint, but the joint 24 is not restrained by welding. Vibrate up and down.
FIG. 7 shows an example in the case where there is a problem during placement, but the vertical joint position of the longitudinal joint position of the connecting member and the longitudinal joint part 260 of the main body and the joint part are close to each other by a predetermined distance. If not separated, both the longitudinal joint 260 of the joint portion and the longitudinal joint 600 of the connecting member 400 vibrate up and down, so that an excessive force acts on the welded portion 700, so that the weld fracture There is a risk of doing.
Therefore, it is preferable that the longitudinal joint portion 600 of the connecting member 400 is provided at a predetermined distance away from the longitudinal joint portion 250 of the main body and the longitudinal joint portion 260 of the joint portion.
If the longitudinal joint portion 600 exists outside the vertical vibration amplitude range of the longitudinal joint portion 260 of the joint portion, both the longitudinal joint portion 260 and the longitudinal joint portion 600 of the joint portion vibrate up and down to the welded portion 700. No excessive force will be applied. That is, it is only necessary to be separated by a predetermined distance that is equal to or greater than the amplitude of the vertical vibration of the longitudinal joint portion 260 of the joint portion. Since the vertical vibration amplitude of the joint portion 260 of the joint portion is within the amplitude range of the steel sheet pile at the time of placing, the amplitude of the steel sheet pile may be used. On the other hand, since the longitudinal joint portion 600 also vibrates up and down within the range of the amplitude of the steel sheet pile when placing, it is better that the vertical vibration amplitude of the longitudinal joint portion 600 is included in the predetermined distance.
That is, the predetermined distance may be at least twice the amplitude of the steel sheet pile, and is 10 mm or more.
On the other hand, the upper limit value of the predetermined distance is not particularly limited as long as it does not hinder placement.
The predetermined distance is preferably about 1 m apart. The reason for this is that in a general steel sheet pile wall structure configured by connecting a plurality of adjacent steel sheet piles to each other, the longitudinal position by welding joining of the steel sheet pile main body becomes weak due to the thermal effect of welding, To prevent the weak point in strength of the steel sheet pile wall structure from being formed by separating them by about 1 m in a staggered arrangement so that the vertical position of each longitudinal joining position of a plurality of adjacent steel sheet piles is not aligned. Based on the actual results.
According to such a configuration, even when the upper and lower steel sheet pile main bodies are welded and joined at the main body longitudinal joint portion and the joint portion 240 is not welded, the longitudinal joint of the main body longitudinal joint portion 250 and the joint portion. By providing the longitudinal joint portion 600 of the connecting member 400 at a predetermined distance from the portion 260, only the joint portion 240 can freely vibrate up and down at the position of the longitudinal joint portion of the main body longitudinal joint portion and the joint portion. Therefore, an excessive force can be prevented from acting on the welded portion 700, and the quality of the welded portion can be ensured.

On the other hand, the steel sheet pile wall structure of the present invention is a steel sheet pile wall structure configured by connecting a plurality of adjacent steel sheet piles to each other. Other steel sheet piles that are fitted and connected to the connection members attached to the steel sheet piles are included.
According to such a configuration, similar to the above, since inertial force does not concentrate on one point of the welded portion in the connecting portion of the connecting member, stress concentration can be avoided, and the welded portion It is possible to reliably prevent the occurrence of cracks from the starting point, and to ensure the quality of the steel sheet pile and the steel sheet pile wall structure.

According to the steel sheet pile and the steel sheet pile wall structure of the present invention as described above, when the steel sheet pile is placed, cracks are not generated from the welded portion of the connecting member, and the connecting member is not detached. Construction efficiency is improved and the construction period can be shortened.
In addition, since it is not necessary to groove the connecting member and vertically connect the connecting members in the vertical direction by welding, the construction cost can be greatly reduced.
Furthermore, since generation | occurrence | production of the crack of a steel sheet pile base material can be suppressed, the member quality of a steel sheet pile and the structural performance of a steel sheet pile wall structure can be ensured favorably.

It is sectional drawing which shows a part of steel sheet pile wall structure which concerns on 1st Embodiment of this invention. It is sectional drawing and front view which show the steel sheet pile used for the said steel sheet pile wall structure. It is a front view which expands and shows the principal part of the said steel sheet pile. It is a front view which shows the modification of the said steel sheet pile. It is sectional drawing which shows a part of steel sheet pile wall structure which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the example of a conventional malfunction. It is a front view of the steel sheet pile which shows the other example of a conventional malfunction.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
In the second and subsequent embodiments, the same constituent members as those described in the first embodiment and the constituent members having the same functions are denoted by the same reference numerals as those in the first embodiment. Those descriptions are omitted or simplified.

[First Embodiment]
1 and 2, a steel sheet pile wall 1 is constructed by connecting a plurality of steel sheet piles 2 and 3 to be placed on the ground. One steel sheet pile 2 includes a steel sheet pile main body 20 made of the same hat-shaped steel sheet pile as the steel sheet pile 3 and a connection member 4 attached to a joint portion 24 which is a side edge of the steel sheet pile main body 20 by welding. It is prepared for. The other steel sheet pile 3 and the steel sheet pile main body 20 are manufactured by hot rolling, respectively, and the first flanges 21 and 31 located at the center of the cross section and a pair of webs continuous to both side edges of the first flanges 21 and 31. 22, 32, a pair of second flanges 23, 33 extending outward from the first flanges 21, 31 from the tip edges of the pair of webs 22, 32, and the tip edges of the pair of second flanges 23, 33 It has a pair of joint portions 24 and 34 to be provided. The steel sheet pile 3 is connected to the steel sheet pile 2 by fitting the joint portion 34 to the connection member 4.

The connecting member 4 is manufactured by hot rolling and formed with joint portions 41 and 42 for connecting a plurality of steel sheet piles (the steel sheet pile main body 20 and the steel sheet pile 3), as shown in FIG. As shown, a plurality of members formed shorter than the length of the steel sheet pile main body 20 are attached along the longitudinal direction of the steel sheet pile main body 20, and the connecting members 4 are arranged side by side with the longitudinal joint portion 6 therebetween. ing.
And the connection member 4 has the joint part 41 fitted in the joint part 24 of the steel sheet pile main body 20, and the steel sheet pile main body by the welding part 7 formed so that these joint parts 24 and 41 may be straddled. 20 is fixed. The welded portions 7 are formed intermittently in the vertical direction of the steel sheet pile main body 20 and the connecting member 4, and each welded portion 7 is formed having a weld length of a predetermined length (for example, 40 mm). .

  As shown in FIG. 3, in the vicinity of the longitudinal joint portion 6 of the connection member 4, the welded portion 7 of the upper connection member 4 </ b> A located on the upper side of the longitudinal joint portion 6 has a weld toe portion 7 </ b> A at the lower end thereof. It is spaced apart from the longitudinal joint 6. On the other hand, the welded portion 7 of the lower connecting member 4 </ b> B located on the lower side of the longitudinal joint portion 6 is provided with a weld toe portion 7 </ b> B at the upper end thereof being separated from the longitudinal joint portion 6. More specifically, a predetermined separation distance L is secured between the weld toe portions 7A and 7B of the welding portion 7 and the longitudinal joint portion 6, and the separation distance L is as short as possible. Although it is desirable to be so, since it is subject to restrictions on the welding skill for forming the welded portion 7, it is set to be longer than the leg length L1 of the welded portion 7, and the lower limit value of the separation distance L is set to 5 mm. It is preferable. That is, if the separation distance L is shortened to less than 5 mm, it becomes difficult to form the welded portion 7 while ensuring the separation distance L in terms of welding skill. Therefore, the lower limit value of the separation distance L is set. Yes. On the other hand, the upper limit value of the separation distance L is not particularly limited as long as the welding length of the welded portion 7 sufficient to obtain the fixing strength of the connecting member 4 is ensured. In addition, the welds 7 positioned above and below the longitudinal joint 6 may be a single layer in order to avoid stress concentration, and the welds 7 at other positions may be a multilayer.

In addition, as shown in FIG. 4, when the steel sheet pile main bodies 20 of the steel sheet pile 2 </ b> A are welded up and down at the main body longitudinal joint portion 25 and the connecting member 4 is attached across the main body longitudinal joint portion 25. The main body longitudinal joint portion 25 and the longitudinal joint portion 6 of the connecting member 4 are provided apart from each other by a predetermined distance in the vertical direction, and the main body longitudinal joint portion 25 and the longitudinal joint portion 6 of the connecting member 4 are provided. Are provided so as to be displaced in the vertical direction, and the welded portion 7 for welding the steel sheet pile main body 20 and the connecting member 4 is formed in a state of being separated from the main body longitudinal joint portion 25 by a predetermined separation distance L2, L3. It is configured.
That is, when the connecting member 4 is welded and attached to the side edge of the steel sheet pile main body 20 including the longitudinal joint position of the joint portion 24 when placing by the vibration method, the inertial force is applied to one point of the welded portion. Since there is a risk of causing cracks in the welded portion by acting intensively, cracking of the welded portion is prevented by separating the welded portion 7 from the main body longitudinal joint portion 25 by the separation distances L2 and L3. be able to.
In addition, when the connection member 4 including the longitudinal joint portion 26 of the joint portion 24 is welded and attached to the side edge of the steel sheet pile main body 20, the mechanism in which the welded portion 7 is cracked is the same as that of the connection member 4. Since the mechanism is essentially the same as the mechanism in which the welded portion 7 cracks when it is welded to the side edge of the steel sheet pile main body 20 including the longitudinal joint position, the separation distances L2 and L3 provided as countermeasures are the above separation distances. What is necessary is just to be set to the distance L or more.

According to the above embodiment, the following effects can be obtained.
That is, by forming the welded part 7 away from the longitudinal joint part 6, the inertial force when penetrating the steel sheet pile 2 into the ground by the vibration method is not concentrated on one point of the welded part 7, and stress is applied. Concentration is avoided. And, since the welded portion 7 bears in a linear state in the longitudinal direction instead of a single point with respect to the inertial force generated in the connecting member 4, a crack is generated from the welded portion 7 as a starting point without causing stress concentration. Since the working member 4 is not detached, the work is not interrupted and reattached, so that the construction efficiency can be improved and the construction period can be shortened. Furthermore, since stress concentration at one point of the welded portion 7 can be avoided, the occurrence of cracks starting from the welded portion 7 can be prevented, and the propagation of cracks to the base material of the steel sheet pile body 20 in the steel sheet pile 2 can be prevented. Therefore, the quality of the steel sheet pile wall 1 can be ensured without deteriorating.

Further, by setting the separation distance L between the welded portion 7 and the longitudinal joint portion 6 as small as possible, when the steel sheet pile 2 is penetrated into the ground by the vibration method, the vibration for the upper connection member 4A and the lower connection member Generation | occurrence | production of a shift | offset | difference between member 4B can be suppressed. Therefore, when the joint part 34 of the steel sheet pile 3 is slid from the upper direction to the lower part and fitted to the joint part 42 of the connecting member 4 of the steel sheet pile 2 penetrating into the ground, the joint parts 34 and 42 are connected to each other. Can be prevented from interfering with each other, and the placement resistance can be suppressed.
Furthermore, since it is not necessary to join the connecting members 4 arranged in the vertical direction by longitudinal welding, a process involving groove processing does not occur in the longitudinal part 6 of the connecting member 4, which greatly increases the construction cost. It is possible to reduce it to

[Second Embodiment]
Next, a steel sheet pile wall 1A according to a second embodiment of the present invention will be described with reference to FIG.
In FIG. 5, the steel sheet pile wall 1 </ b> A is different from the first embodiment in the connection direction of the steel sheet piles 2, 3 and the form and attachment position of the connection member 8. Is substantially the same. Hereinafter, the differences will be described in detail.
The steel sheet pile 2 includes a steel sheet pile main body 20 and a connection member 8 that is attached to a first flange 21 that is a side surface of the steel sheet pile main body 20 by welding. The steel sheet pile 3 is connected to the steel sheet pile 2 by fitting the joint portion 34 to the connection member 8.

  The connecting member 8 has a leg portion 81 that extends substantially orthogonal to the first flange 21 and a pair of joint portions 82 and 83 that extend left and right from the tip of the leg portion 81 and is formed in a substantially T-shaped cross section. Yes. The connecting member 8 has a leg portion 81 fixed to the first flange 21 by the welded portion 7, and the joint portion 34 of the steel sheet pile 3 is fitted and connected to one joint portion 82. Yes. The connecting member 8 has a longitudinal joint portion similar to the connecting member 4 of the first embodiment, and the welded portion 7 is separated from the longitudinal joint portion by a predetermined distance as in the first embodiment. Is formed. Therefore, the effect similar to 1st Embodiment can be show | played also in 1 A of steel sheet pile walls of 2nd Embodiment.

In order to verify the effect of the present invention, the following placing test was conducted.
That is, using a construction heavy machine whose maximum vibration force of the vibration method is 473 kN, the required length per meter in the longitudinal direction of the steel sheet pile main body 20 of the welded portion 7 is 40 mm / m, the throat thickness is 10 mm, and the separation When a field driving test was performed on the steel sheet pile 2 with a distance L of 5 mm, the amplitude, the vibration frequency, and the number of vibrations, which are values that increase the inertial force acting on the connecting member 4 as the value increases, Even in extremely severe construction conditions of 46,000 times corresponding to 2 mm, 60 Hz and 3 times of repeated placement, the connecting member 4 did not come off during placement, and the steel sheet pile main body 20 The work condition was good without cracks in the base material.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, the connection members 4 and 8 of the above embodiment are merely examples of the connection member, and the cross-sectional shape and the number of joint portions are not particularly limited, and the adjacent steel having at least one joint portion. What is necessary is just to be connected with a sheet pile by fitting.
Moreover, in the said embodiment, although the steel sheet pile main body 20 and the steel sheet pile 3 were comprised with the hat-shaped steel sheet pile, as a steel sheet pile main body of this invention, or the steel sheet pile of connection object, not only a hat-shaped steel sheet pile but U-shape Other forms of steel sheet piles such as steel sheet piles and Z-shaped steel sheet piles can also be used.
Moreover, as an attachment position of the member for connection with respect to a steel sheet pile main body, the joint part 24 which is a side edge of the steel sheet pile main body 20 like 1st Embodiment, or the steel sheet pile main body 20 like 2nd Embodiment. It is not limited to the first flange 21 that is the side surface of the above, but may be the web 22 or the second flange 23, or a plurality of connecting members may be attached to one steel sheet pile main body.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  DESCRIPTION OF SYMBOLS 1, 1A ... Steel sheet pile wall, 2, 2A ... Steel sheet pile, 3 ... Steel sheet pile (other steel sheet piles), 4, 8 ... Connection member, 4A ... Upper connection member, 4B ... Lower connection member, 6 ... vertical joint, 7 ... weld, 7A, 7B ... weld toe, 20 ... steel sheet pile main body, 21 ... first flange (side surface), 24 ... joint (side edge), 25 ... main body longitudinal joint , L: separation distance, L1: leg length.

Claims (3)

It has a steel sheet pile main body and a connecting member attached by welding to the side edge or side surface of this steel sheet pile main body, and is a steel sheet pile that does not cascade weld the connecting members ,
The connecting member is configured to have an upper connecting member and a lower connecting member that are arranged side by side across at least one longitudinal joint along the longitudinal direction of the steel sheet pile main body,
While the lowermost welding toe portion of the upper connecting member is separated from the longitudinal joint portion, the uppermost welding toe portion of the lower connection member is separated from the longitudinal joint portion, The connection member is welded and fixed to the steel sheet pile main body by intermittent welding or continuous welding ,
The separation distance between the lowermost weld toe and the longitudinal joint of the upper connection member, and the separation distance between the uppermost weld toe and the longitudinal joint of the lower connection member are It is set to be longer than the leg length of the welded portion for welding the connecting member and the steel sheet pile main body,
A steel sheet pile having a lower limit of the separation distance of 5 mm or more . In the steel sheet pile according to claim 1,
The steel sheet pile main body is composed of at least a pair arranged vertically, and a pair of upper and lower steel sheet pile main bodies are welded and joined at the main body longitudinal joint portion,
The connecting portion of the connecting member is provided at a predetermined distance away from the main connecting portion of the main body either above or below ,
The steel sheet pile, wherein the predetermined distance is 10 mm or more .
A steel sheet pile characterized by A steel sheet pile wall structure constituted by connecting a plurality of adjacent steel sheet piles to each other,
The plurality of steel sheet piles include the steel sheet pile according to claim 1 or 2 and other steel sheet piles fitted and connected to a connection member attached to the steel sheet pile. Steel sheet pile wall structure characterized by that.

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