JP2019056227A - Method of placing steel sheet piles - Google Patents

Abstract

To provide a method of placing steel sheet piles with improved placement accuracy and construction efficiency.SOLUTION: A method of placing steel sheet piles in which a plurality of steel sheet piles 20 are connected to each other at joint portions and the steel sheet piles are placed in a single row, comprises a pre-placement step of placing the steel sheet piles 20 in the two end areas in advance, a guide sheet pile arrangement step in which a plurality of guide sheet piles are arranged in a row, connected to each other at the joint portion of the guide sheet piles in a central area located between the two end areas, the joint portions of guide sheet piles arranged at both ends of the plurality of guide sheet piles arranged in a row are respectively connected to and arranged at the joint portions of the steel sheet pile 20 at the end on the side of the steel sheet pile 20, which is placed in advance of the two end areas, toward the center portion of one row, and a replacement and placing step of sequentially replacing and placing the plurality of guide sheet piles arranged in the guide sheet pile arrangement step into a permanent steel sheet pile 20 whose cross section in the width direction is substantially the same as the guide sheet pile.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a steel sheet pile placing method, and more particularly, to a steel sheet pile placing method in which placement accuracy and construction efficiency are improved by using a guide sheet pile that is not a steel pile sheet.

  As shown in FIG. 24, the arc sheet pile jacket construction method is a construction method of a quay where the jacket type pier 300 and the retaining wall 100 are integrated. ) Steel sheet pile cell type earth retaining arc sheet pile 104 and saddle plate 106 (see Non-Patent Document 1, for example). In the construction of the retaining wall 100 composed of the arc sheet pile 104 and the saddle plate 106, it is necessary to securely close the arc sheet pile 104. For this purpose, the individual straight steel sheet piles 102 are hit with high accuracy. It is necessary to install (for example, refer nonpatent literature 2).

  Further, in Non-Patent Document 2, “a method of lowering from the left and right to the final insertion, and placing several remaining sheets in the center portion alternately and driving down” (specifically, from the saddle plates at both ends) (4) After placing 4 sheets left and right toward the center, build up the remaining 5 sheet piles at the center, repeat the work of gradually lowering from the sheet piles at both ends, and drive to a predetermined depth. It has been reported that the arc sheet pile 104 can be closed smoothly by adopting.

  However, in the arc sheet pile jacket method, it is further required to place the arc sheet pile with higher placement accuracy and to realize higher construction efficiency.

  Further, not only the arc sheet pile jacket method but also the overall construction of placing steel sheet piles is desired to improve the steel sheet pile placing accuracy and construction efficiency.

Hisao Takahashi and five others, “Test construction of arc sheet pile placement in the arc sheet pile jacket method”, Annual Conference of the 71st Annual Conference of Japan Society of Civil Engineers, September 2016, VI-628 , P.1255-1266 Hisao Takahashi and five others, “Main construction of arc sheet pile earth retaining in the arc sheet pile jacket method”, Annual Conference of the 71st Annual Conference of Japan Society of Civil Engineers, September 2016, VI-627 , P. 1253-1254

  This invention is made | formed in view of this condition, and makes it a subject to provide the placement method of the steel sheet pile which improved the placement precision and construction efficiency.

  The present invention solves the above problems by the following steel sheet pile driving method.

  That is, the steel sheet pile driving method according to the present invention is a steel sheet pile in which a plurality of steel sheet piles provided with joint portions at both ends in the width direction are connected to each other at the joint portions to form a plurality of steel sheet piles. Among the steel sheet piles to be placed in a row, each of the steel sheet piles is located at both ends of each of the sheet piles, and each of the predetermined distances from the both ends toward the center of the row A preceding placement step of placing steel sheet piles in two end regions including a number of steel sheet piles in advance, and a length longer than the length of the steel sheet pile placed in advance in the preceding placement step A guide sheet pile that is short and has joint portions at both ends in the width direction is connected to each other at the joint portion of the guide sheet pile in a central region located between the two end regions. Among the guide sheet piles that are arranged in a row and arranged in a row The joint of the guide sheet pile arranged at the end portion is the steel sheet pile at the end portion on the side facing the central portion of the row of steel sheet piles placed in advance of the two end regions. The guide sheet pile arrangement step that is connected to the joint portion and arranged, and the plurality of guide sheet piles arranged in the guide sheet pile arrangement step are sequentially replaced with main steel sheet piles whose cross sections in the width direction are substantially the same as the guide sheet piles. A steel sheet pile placing method comprising: a replacement placing step for placing the steel sheet pile.

  Here, the “width direction” of the steel sheet pile is a direction orthogonal to the direction rising from the ground surface in the state of being placed on the ground as a steel sheet pile, and the in-plane direction of the steel sheet pile (formed by the steel sheet pile) Direction in the wall surface).

  Further, the “width direction” of the guide sheet pile is a direction orthogonal to the direction rising from the ground surface in a state where the guide sheet pile is arranged on the ground, and the in-plane direction of the guide sheet pile (the wall surface formed by the guide sheet pile) (Inside direction).

  In addition, the cross section in the width direction of the steel sheet pile is a cross section obtained by cutting the steel sheet pile in a plane perpendicular to the direction in which the steel sheet pile rises from the ground surface in a state where the steel sheet pile is placed on the ground. Yes, the cross-section in the width direction of the guide sheet pile is a cross section obtained by cutting the guide sheet pile in a plane perpendicular to the direction in which the guide sheet pile rises from the ground surface in the state where the guide sheet pile is arranged on the ground. .

  Also, the fact that the width direction cross section of the guide sheet pile and the steel sheet pile of the present construction that replaces the guide sheet pile is substantially the same means that it is the same except for errors during production, etc., and can be regarded as substantially the same width direction cross section. That's what it means.

  The cross sections in the width direction of the steel sheet piles that are placed in a row may be substantially the same.

  Here, that the cross sections in the width direction of the steel sheet piles are substantially the same means that they are the same except for errors during production and the like, and can be regarded as substantially the same cross section in the width direction.

  In the replacement placing step, the guide sheet piles that are part of the plurality of guide sheet piles arranged in the guide sheet pile arrangement step and that are not adjacent to each other are selected to the main steel sheet piles. A step of replacing and placing may be included.

  In the replacement driving step, the main steel sheet pile is selected by selecting one guide sheet pile among the plurality of guide sheet piles arranged in the guide sheet pile arrangement step. A step of placing and placing may be included.

  In the replacement driving step, the main steel sheet pile is selected by selecting a guide sheet pile that is a part of the plurality of guide sheet piles arranged in the guide sheet pile arrangement step. A step of placing and placing may be included.

  The position of the both ends of the steel sheet pile to be placed in a row may be determined in advance.

  The cross section in the width direction of the steel sheet pile may be substantially linear.

  Here, that the cross section in the width direction of the steel sheet pile has a substantially linear shape means that it can be determined as a whole linear shape except for the shape of details such as the joint portion.

  At least some of the steel sheet piles that are placed in a single row may form a curved line.

  The play of the joint portion of the steel sheet pile may be 8 mm or more and 12 mm or less.

  Here, “the play of the joint portion of the steel sheet pile” is a margin of fitting margin in the width direction of the two steel sheet piles to be connected. Specifically, the joint portions are connected to each other at the joint portion. The difference in length in the width direction between the two connected steel sheet piles when the tensile force is applied in the width direction and the compressive force is applied in the width direction. is there.

  In the state where the guide sheet pile is arranged on the ground in the guide sheet pile arrangement step, the height position of the upper end of the guide sheet pile is only 1 m or more and 2 m or less than the foot scene of the operator who performs work on the guide sheet pile. A high position is preferable.

  According to the steel sheet pile driving method according to the present invention, the driving accuracy and construction efficiency can be improved.

The top view which shows typically the placement position and arrangement | positioning condition of the linear steel sheet pile 20 which performs placing using the steel sheet pile placing method which concerns on 1st Embodiment and 2nd Embodiment of this invention. The expanded sectional view which shows the width direction cross section of the linear steel sheet pile 20 The figure which showed typically the direction of the weak axis about the linear steel sheet pile 20, and the direction of the strong axis It is the IV-IV sectional view taken on the line of FIG. 2 and FIG. 5, and the expanded side sectional view which expands and shows the site | part of the attachment jig 32 FIG. 5 is a cross-sectional view taken along the line V-V in FIGS. 2 and 4, and is an enlarged front cross-sectional view showing an enlarged portion of the mounting jig 32. Cross-sectional view in the width direction showing a state in which the four straight steel sheet piles 20 are connected to each other via the joint portion 20A. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placement method of the steel sheet pile concerning 1st Embodiment of this invention. Cross-sectional view in the width direction showing a state in which the four guide sheet piles 24 are connected to each other via the joint portion 24A. The figure which shows typically the erection situation of the linear steel sheet pile 20 of the permanent installation to the center part area | region (setting position 5-9) in the construction currently reported by the nonpatent literature 2. In the construction reported in Non-Patent Document 2, hammering the straight steel sheet piles 20 installed in the central area (placement positions 5 to 9) little by little (300 mm) within a range where interference does not occur. The figure which shows the situation where the work which lowers is done typically The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. The figure which shows typically one stage of each characteristic stage of the placing method of the steel sheet pile concerning 2nd Embodiment of this invention. Perspective view schematically showing arc sheet pile jacket method

  Hereinafter, a steel sheet pile placing method according to the first and second embodiments of the present invention will be described in detail with reference to the drawings.

(1) Common items in the steel sheet pile placing method according to the first embodiment and the second embodiment of the present invention FIG. 1 shows a steel sheet pile placing method according to the first embodiment and the second embodiment of the present invention. It is a top view which shows typically the placement position and arrangement | positioning condition of the linear steel sheet pile 20 which performs placement using. FIG. 2 is an enlarged cross-sectional view showing a cross-section in the width direction of the linear steel sheet pile 20. In FIG. 1, the numbers given above the auxiliary H steel 30 indicate the respective placement positions at which the linear steel sheet pile 20 is to be placed.

  Hereinafter, the case where the arc sheet pile 22 is constructed by placing the straight steel sheet pile 20 at the placement positions 1 to 13 between the adjacent saddle plates 23 will be described. A method for placing a steel sheet pile according to the second embodiment will be described. The arc sheet pile 22 is constructed by placing linear steel sheet piles 20 at placement positions 1 to 13 between adjacent saddle plates 23. The saddle plate 23 is driven at a predetermined position before the linear steel sheet pile 20 is driven at the driving positions 1 to 13. Therefore, the positions of both ends of the linear steel sheet pile 20 to be placed at the placement positions 1 to 13 (of the joint portion 20A to be fitted with the saddle plate 23 of the linear steel sheet pile 20 to be placed at the placement positions 1 and 13). The position) is determined in advance before placing the linear steel sheet pile 20 at the placement positions 1 to 13.

  As shown in FIG. 2, the linear steel sheet pile 20 includes joint portions 20 </ b> A at both ends in the width direction. Further, as shown in FIG. 2, the linear steel sheet pile 20 to be placed at the placement positions 1 to 13 is provided with an auxiliary H steel 30 on the back surface (surface on the landfill side) via an attachment jig 32. Are attached to each. The attachment jig 32 is attached to the back surface (surface on the landfill side) of the linear steel sheet pile 20 by welding. The shape of the linear steel sheet pile 20 is W = 500 mm, length L = 22 m, and thickness t = 9.5 mm, and the bending rigidity around the weak axis is small. There is a risk of deformation around the weak axis. FIG. 3 is a diagram schematically showing the direction around the weak axis and the direction around the strong axis for the linear steel sheet pile 20. In order to prevent deformation around the weak axis, a vertical downward force is applied to the linear steel sheet pile 20 through the auxiliary H steel 30 that supplements the bending rigidity of the linear steel sheet pile 20. However, depending on the ground conditions, the straight steel sheet pile 20 may be appropriately driven without using the auxiliary H steel 30. In such a case, it is not necessary to use the auxiliary H steel 30. Further, depending on the ground conditions, it may be appropriate not only to use the auxiliary H steel 30 but also to use a water jet together. In such a case, a water jet may be used in combination.

  4 is a cross-sectional view taken along the line IV-IV in FIGS. 2 and 5, and is an enlarged side cross-sectional view showing a portion of the attachment jig 32 in an enlarged manner. FIG. 5 is a cross-sectional view taken along the line VV in FIGS. 2 and 4 and is an enlarged front cross-sectional view showing an enlarged portion of the attachment jig 32.

  As shown in FIGS. 4 and 5, the flange 30 </ b> A of the auxiliary H steel 30 is provided with a notch 30 </ b> A <b> 1 that engages with the attachment jig 32. The upper side portion of the notch 30A1 is engaged with the attachment jig 32, so that a downward force in the vertical direction can be transmitted from the auxiliary H steel 30 to the linear steel sheet pile 20 via the attachment jig 32. On the other hand, when the auxiliary H steel 30 is pulled upward, the mounting jig 32 does not engage with the notch 30A1, so that the auxiliary H steel 30 can be pulled upward and removed after the linear steel sheet pile 20 is placed. It has become. 4 and 5, reference numeral 30 </ b> B indicates a web of the auxiliary H steel 30.

  The attachment jig 32 shown in FIGS. 4 and 5 is a plurality of intermediate parts (parts other than the upper end and the lower end of the linear steel sheet pile 20 that are different in the longitudinal direction. 1 point and 2/3 point). Mounting jigs (not shown) provided at the upper and lower ends of the linear steel sheet pile 20 are different in shape from the mounting jig 32. The attachment jig provided at the upper end of the linear steel sheet pile 20 can transmit an upward force from the auxiliary H steel 30 to the linear steel sheet pile 20 and is detached from the linear steel sheet pile 20. Can be easily done. The mounting jig provided at the lower end of the linear steel sheet pile 20 can transmit only a downward force to the linear steel sheet pile 20.

  FIG. 6 is a cross-sectional view in the width direction showing a state in which the four straight steel sheet piles 20 are connected to each other via the joint portion 20A. As shown in FIG. 6, the linear steel sheet piles 20 are connected in a row, and resist against external force such as earth pressure by hoop tension (in-plane circumferential tensile force of the fitted sheet pile row). Can be done. Therefore, the play of the joint part 20A of the linear steel sheet pile 20 is set as small as 8 mm or more and 12 mm or less. Here, the play of the joint part 20A of the linear steel sheet pile 20 is a margin of fitting margin in the width direction of the two linear steel sheet piles 20 to be connected. The width of the two linear steel sheet piles 20 connected in the width direction when a tensile force is applied in the width direction and a compressive force is applied in the width direction to the two linear steel sheet piles 20 connected to each other Is the difference between

  In addition, in FIG. 6, description of the auxiliary H steel 30 grade | etc., Is abbreviate | omitted.

(2) Procedure of the steel sheet pile placing method according to the first embodiment of the present invention FIGS. 7 to 12 schematically show the characteristic steps of the steel sheet pile placing method according to the first embodiment of the present invention. FIG. 7-12, the number described above each linear steel sheet pile 20 or each guide sheet pile 24 has shown each placement position (refer FIG. 1) which places the linear steel sheet pile 20. FIG. The depth of the sea bottom at the point where the steel sheet pile driving method according to the first embodiment is carried out is 6.5 m from the sea surface. In addition, in carrying out the steel sheet pile driving method according to the first embodiment, the scaffold is positioned so that the height of the foot scene on which the worker works is located at a height of 1 to 1.5 m from the sea surface. Is building. In addition, in FIGS. 7-12, description of the auxiliary | assistant H steel 30 grade | etc., Is abbreviate | omitted, and it is the same also about FIGS. 14-23 described later.

  FIG. 7 is a diagram schematically showing a state after the preceding placing step.

  In the preceding placement process, the placement positions 1 to 13 located at both ends of the placement positions 1 to 13 are included, and the placement positions 1 to 13 arranged in a line from the placement positions 1 and 13 are included. The linear steel sheet pile 20 of this installation about two edge area | regions (the edge area | region of the casting positions 1-4 and the edge area of the casting positions 10-13) each including four placement positions toward a center part. Is placed in advance.

  Specifically, in the preceding placement process, the straight steel sheet pile 20 is grounded to a predetermined depth by pushing the placement areas 1, 2, 3, and 4 in the order of the end regions of the placement positions 1 to 4. 80, and at the end regions of the casting positions 10 to 13, the straight steel sheet pile 20 is driven to the ground 80 to a predetermined depth by one-pressing in the order of the casting positions 13, 12, 11, and 10. To do. The straight steel sheet piles 20 to be placed at the placement positions 1 and 13 located at both ends are placed by fitting the joint portion 20A to the saddle plate 23.

  When the permanent straight steel sheet pile 20 is driven to the ground 80 to a predetermined depth in the preceding driving process, the driving can be performed using, for example, a vibro hammer.

  At the stage where the preceding placing process is completed (the state shown in FIG. 7), the placement of the linear steel sheet pile 20 is completed for the two end regions (placement positions 1 to 4 and 10 to 13). However, nothing is implemented for the central region (placement positions 5 to 9).

  FIG. 8 is a diagram schematically illustrating a state after the guide sheet pile arrangement process is performed.

  In the guide sheet pile arranging step, after the preceding placing step (after the state shown in FIG. 7), the guide sheet piles 24 are connected to each other by the joint portion 24A in the central region (placed positions 5 to 9). The joint portion 24A of the guide sheet pile 24 arranged at both ends (placement positions 5 and 9) of the guide sheet pile 24 arranged in a row (five) is arranged in advance. Of the straight steel sheet piles 20 placed in advance of the two end regions (placement positions 1 to 4 and 10 to 13) in the installation step, the linear steel at the end on the side toward the central portion in a line. The sheet piles 20 (the straight steel sheet piles 20 placed at the placement positions 4 and 10) are respectively connected to the joint portions 20A. When the guide sheet pile 24 is arranged at a predetermined position, for example, it can be performed using a hanging jig connected to a crane. The chuck device may be used without vibrating.

  The shape of the cross section in the width direction of the guide sheet pile 24 is the same as the shape of the cross section in the width direction of the linear steel sheet pile 20, and the shape of the cross section in the width direction is linear steel at both ends in the width direction of the guide sheet pile 24. A joint portion 24A that is the same as the joint portion 20A of the sheet pile 20 is provided. The length of the guide sheet pile 24 is shorter than the length of the linear steel sheet pile 20. Specifically, the length of the guide sheet pile 24 used in the first embodiment is a length that reaches 2.5 m above the sea surface from the sea bottom, and is 9 m. As described above, the depth of the sea bottom at the point where the steel sheet pile placing method according to the first embodiment is performed is 6.5 m from the sea surface.

  FIG. 13 is a cross-sectional view in the width direction showing a state where the four guide sheet piles 24 are connected to each other via the joint portion 24A. As described above, since the shape of the cross section in the width direction of the guide sheet pile 24 is the same as the shape of the cross section in the width direction of the linear steel sheet pile 20, the cross section in the width direction of the four guide sheet piles 24 connected (FIG. 13). The contour line is the same as the contour line in the cross-sectional view in the width direction of the four linear steel sheet piles 20 connected (FIG. 6).

  The guide sheet pile 24 is a member used for accurately grasping in advance the placement position of the linear steel sheet pile 20 of the actual installation, and is disposed on the ground 80 and not placed on the ground 80. Can be easily adjusted. Further, since the guide sheet pile 24 is merely placed on the sea bottom and is not placed on the ground 80, the auxiliary H steel 30 is also unnecessary. In addition, the length of the straight steel sheet pile 20 is 22 m, whereas the length of the guide sheet pile 24 is as short as 9 m. From this point, the guide sheet pile 24 can easily adjust the arrangement position. Can do.

  Accordingly, the guide sheet pile 24 is arranged in the central region (placement positions 5 to 9) while finely adjusting the position, and the eight books placed in the placement positions 1 to 4 and 10 to 13 in the preceding placement process. It is possible to reliably and easily perform the connection and closing with the provided linear steel sheet pile 20.

  In addition, as described above, the height position of the foot scene on which the operator works is a height position of 1 to 1.5 m from the sea surface, so the length arranged in the central region (placed position 5 to 9). The height position of the upper end of the 9-meter guide sheet pile 24 is a height position 1 to 1.5 m higher than the height position of the foot scene on which the worker works. Therefore, when another guide sheet pile 24 is arranged at a position adjacent to the already arranged guide sheet pile 24, the operator can easily perform the operation of fitting the joint portions 24A of the adjacent guide sheet piles 24 together.

  9-12 is a figure which shows typically the state of each step which is implementing the replacement placement process.

  In the replacement driving process, after the guide sheet pile arrangement process is completed (after the state shown in FIG. 8), the guide sheet pile 24 arranged in the central region (placement position 5 to 9) is used as the linear steel sheet pile 20 of the actual installation. Sequentially replace and cast. In the guide sheet pile arrangement process, the guide sheet pile 24 is appropriately arranged in the central region (placement positions 5 to 9), and eight books are placed in the placement positions 1 to 4 and 10 to 13 in the preceding placement process. Since it is appropriately connected and closed with the installed linear steel sheet pile 20, if the installed linear steel sheet pile 20 is sequentially replaced with the guide sheet pile 24, the installed positions 5 to 9 are installed. The straight steel sheet piles 20 are inevitably placed at appropriate positions to improve the placement accuracy, and the eight straight lines placed at the placement positions 1 to 4 and 10 to 13 in the preceding placement process. The arc sheet pile 22 can be reliably formed by appropriately connecting and closing with the shaped steel sheet pile 20.

  In the replacement driving process, after the guide sheet pile arrangement process is completed (after the state shown in FIG. 8), first, as shown in FIG. 9, the guides are arranged at the driving positions 5, 7, and 9 which are positions to be skipped. The sheet pile 24 is replaced with a regular straight steel sheet pile 20.

  Next, as shown in FIG. 10, the permanent straight steel sheet piles 20 arranged at the placement positions 5, 7, and 9, which are one skipping position, are sequentially placed on the ground 80 to a predetermined depth.

  Next, as shown in FIG. 11, the guide sheet piles 24 arranged at the remaining placement positions 6 and 8, which are one skipped position, are replaced with the straight linear steel sheet piles 20.

  Next, as shown in FIG. 12, the permanent straight steel sheet piles 20 arranged at the placement positions 6 and 8, which are one skipping position, are sequentially placed on the ground 80 to a predetermined depth.

  Even when the permanent straight steel sheet pile 20 is driven to the ground 80 to a predetermined depth in the replacement driving process, the driving can be performed using, for example, a vibro hammer as in the preceding driving process.

  In the replacement placing process of the steel sheet pile placing method according to the first embodiment, the straight steel sheet pile 20 of the present construction is sequentially placed at the place where one skip is placed. Can be prevented from interfering with the existing straight steel sheet pile 20 that has not been driven, and the installed straight steel sheet pile 20 can be driven to a predetermined depth all at once. can do.

  For each of the placement positions 5 to 9, when the guide sheet pile 24 is replaced with the straight steel sheet pile 20 at a time, when the replaced linear steel sheet pile 20 is placed, the adjacent straight form where the placement is not completed. There is a case where interference occurs between the steel sheet pile 20 and the driving equipment, and the replaced linear steel sheet pile 20 cannot be driven to a predetermined depth at a stretch. In such a case, it is necessary to sequentially place the respective linear steel sheet piles 20 at the placement positions 5 to 9 within a range where interference does not occur.

  In the construction reported in Non-Patent Document 2, the guide sheet pile 24 is not used. As shown schematically in FIG. Although the depth of 8m was tentatively cast on the bottom of the sea at 9 and the depth of the seabed at the placement positions 5 to 9 is 6.5m from the sea surface. It was necessary to fit the joint part 20A of the linear steel sheet pile 20 of the permanent installation with each other at the temporarily lowered top end which is a height of 0.5 m. This work was a high place work, and it was difficult to install the straight steel sheet pile 20 at the placement positions 5-9. On the other hand, when the straight steel sheet pile 20 built in the placement positions 5 to 9 is placed, interference occurs between the adjacent straight steel sheet pile 20 where the placement is not completed and the placement equipment. Therefore, as schematically shown in FIG. 15, the steel sheets are lowered little by little (by 300 mm) within a range in which no interference occurs in order from the straight steel sheet piles 20 at the both ends (the straight steel sheet piles 20 at the placement positions 5 and 9) The work is repeated and driven to a predetermined depth, and it cannot be said that the construction efficiency is good.

  On the other hand, in the replacement placing step of the steel sheet pile placing method according to the first embodiment, as described above, the placement of the straight steel sheet pile 20 of the present construction is sequentially performed at one placement position. Therefore, it is possible to prevent interference between the driving equipment such as a vibro hammer and the straight steel sheet pile 20 that has not been set up. The straight steel sheet pile 20 of this installation can be driven to a predetermined depth at a stretch.

  Even in the case of sequentially placing the straight steel sheet piles 20 at the placement positions 5 to 9 for one skipping position, if the straight steel sheet piles 20 are driven to a predetermined depth all at once. In the case where interference occurs between the conventional straight steel sheet pile 20 that has not been driven and the driving equipment, the continuous linear steel sheet pile 20 is sequentially placed at the two skipping positions. You may make it perform replacement and placement. This will be described next as a second embodiment.

(3) Procedure of steel sheet pile driving method according to the second embodiment of the present invention The steel sheet pile driving method according to the second embodiment of the present invention is a replacement driving step in which two skipping positions are set. Is different from the steel sheet pile driving method according to the first embodiment of the present invention in that the replacement of the linear steel sheet pile 20 and the driving of the steel sheet pile 20 are sequentially performed. The steel sheet pile driving method according to the first embodiment is the same, and the linear steel sheet pile 20 and the guide sheet pile 24 used are the same. About the content similar to the placement method of the steel sheet pile concerning 1st Embodiment of this invention, description is abbreviate | omitted or simplified and demonstrated.

  FIGS. 16-23 is a figure which shows typically each characteristic step of the placement method of the steel sheet pile concerning 2nd Embodiment of this invention.

  FIG. 16 is a diagram schematically showing a state after performing the preceding placing process, which is the same as FIG. 7 used for explaining the placing method of the steel sheet pile according to the first embodiment. Since the content of the prior placing process in the steel sheet pile placing method according to the embodiment is the same as the steel sheet pile placing method according to the first embodiment, the description thereof is omitted.

  FIG. 17 is a diagram schematically showing a state after the guide sheet pile arrangement step is performed, which is the same as FIG. 8 used for explaining the steel sheet pile placing method according to the first embodiment. Since the content of the guide sheet pile arrangement process in the steel sheet pile placing method according to the embodiment is the same as that of the steel sheet pile placing method according to the first embodiment, the description thereof is omitted.

  18-23 is a figure which shows typically the state of each step which is implementing the replacement placement process.

  In the replacement driving process, after the guide sheet pile arrangement process is completed (after the state shown in FIG. 17), the guide sheet pile 24 arranged in the central region (placement positions 5 to 9) is used as the straight steel sheet pile 20 of the actual installation. Sequentially replace and cast. In the guide sheet pile arrangement process, the guide sheet pile 24 is appropriately arranged in the central region (placement positions 5 to 9), and eight books are placed in the placement positions 1 to 4 and 10 to 13 in the preceding placement process. Since it is appropriately connected and closed with the installed linear steel sheet pile 20, if the installed linear steel sheet pile 20 is sequentially replaced with the guide sheet pile 24, the installed positions 5 to 9 are installed. The straight steel sheet piles 20 are inevitably placed at appropriate positions to improve the placement accuracy, and the eight straight lines placed at the placement positions 1 to 4 and 10 to 13 in the preceding placement process. The arc sheet pile 22 can be reliably formed by appropriately connecting and closing with the shaped steel sheet pile 20.

  In the replacement driving process, after the guide sheet pile arrangement process is completed (after the state shown in FIG. 17), first, as shown in FIG. 18, the guide sheet piles 24 arranged at the driving positions 5 and 8 which are two skipping positions. Is replaced with the straight steel sheet pile 20 of the actual installation.

  Next, as shown in FIG. 19, permanent linear steel sheet piles 20 arranged at the placement positions 5 and 8, which are two skipping positions, are sequentially placed on the ground 80 to a predetermined depth.

  Next, as shown in FIG. 20, the guide sheet piles 24 arranged at the placement positions 6 and 9, which are two skipping positions, are replaced with the regular straight steel sheet piles 20.

  Next, as shown in FIG. 21, the permanent straight steel sheet piles 20 arranged at the placement positions 6 and 9 which are two skipping positions are placed on the ground 80 to a predetermined depth.

  Next, as shown in FIG. 22, the guide sheet pile 24 arranged at the remaining placement position 7 is replaced with a regular straight steel sheet pile 20.

  Next, as shown in FIG. 23, the permanent straight steel sheet pile 20 arranged at the remaining placement position 7 is driven to the ground 80 to a predetermined depth.

  Even when the permanent straight steel sheet pile 20 is driven to the ground 80 to a predetermined depth in the replacement driving process, the driving can be performed using, for example, a vibro hammer as in the preceding driving process.

  In the replacement placing process of the steel sheet pile placing method according to the second embodiment, the straight steel sheet pile 20 is placed in sequence for the two skipped placement positions. Can be prevented from interfering with the existing straight steel sheet pile 20 that has not been driven, and the installed straight steel sheet pile 20 can be driven to a predetermined depth all at once. can do.

(4) Effect of Guide Sheet Pile As described above, the guide sheet pile 24 is a member used for accurately grasping the placement position of the linear steel sheet pile 20 in advance, and is only disposed on the sea bottom. Therefore, the placement position can be easily adjusted since the ground 80 is not driven. In addition, the length of the straight steel sheet pile 20 is 22 m, whereas the length of the guide sheet pile 24 is as short as 9 m. From this point, the guide sheet pile 24 can easily adjust the arrangement position. Can do.

  Accordingly, the guide sheet pile 24 is arranged in the central region (placement positions 5 to 9) while finely adjusting the position, and the eight books placed in the placement positions 1 to 4 and 10 to 13 in the preceding placement process. It is possible to reliably and easily perform the connection and closing with the provided linear steel sheet pile 20. For this reason, the placement accuracy is improved by replacing the guide sheet pile 24 with the permanent linear steel sheet pile 20, and the rework for adjusting the position of the permanent linear sheet pile 20 after placement is reduced. Construction efficiency can be greatly improved.

  In addition, as described above, the height position of the foot scene on which the operator works is a height position of 1 to 1.5 m from the sea surface, so the length arranged in the central region (placed position 5 to 9). The height position of the upper end of the 9-meter guide sheet pile 24 is a height position 1 to 1.5 m higher than the height position of the foot scene on which the worker works. Therefore, when another guide sheet pile 24 is arranged at a position adjacent to the already arranged guide sheet pile 24, the operator can easily perform the operation of fitting the joint portions 24A of the adjacent guide sheet piles 24 together.

  Moreover, as is clear from FIGS. 9 to 12 and FIGS. 18 to 23 of the replacement placing process in the steel sheet pile placing method according to the first and second embodiments of the present invention, 9, the straight steel sheet pile 20 which is replaced with the guide sheet pile 24 is driven in a state where both sides are held by either the guide sheet pile 24 or the straight steel sheet pile 20. For this reason, it is possible to place the replaced linear steel sheet pile 20 while maintaining an appropriate position. For this reason, since the friction with the adjacent linear steel sheet pile 20 of an installation is also reduced, the amount of co-falling can also be reduced and a construction efficiency improves also in this point.

  Further, as described above, the linear steel sheet pile 20 that forms the arc sheet pile 22 resists external force such as earth pressure by hoop tension (in-plane circumferential tensile force of the sheet pile row fitted). Therefore, the play of the joint part 20A of the linear steel sheet pile 20 is set to be as small as 8 mm or more and 12 mm or less. However, since an appropriate driving position can be set in advance by using the guide sheet pile 24, even if the play of the joint portion 20A of the linear steel sheet pile 20 is small as described above, a problem hardly occurs.

  In addition, when the effect of the guide sheet pile used in the steel sheet pile placing method according to the present invention is particularly important, the positions of both ends of the steel sheet piles to be placed are determined in advance. In such a case, if a deviation occurs in the placement position of the steel sheet pile, it may be difficult to place a predetermined number of steel sheet piles to be closed. Therefore, when the positions of the both ends of the steel sheet piles to be placed in advance are determined in advance, the guide sheet piles are determined in advance so that the placement positions of the steel sheet piles of the main construction can be closed. The effect of keeping is particularly important.

  The guide sheet pile used in the steel sheet pile driving method according to the present invention is used not only when a plurality of steel sheet piles are driven in an arc shape, but also when a plurality of steel sheet piles are driven linearly. Therefore, the steel sheet pile driving method according to the present invention can be used even when a plurality of steel sheet piles are driven in a curved shape or in a straight shape.

DESCRIPTION OF SYMBOLS 1-13 ... Placing position 20, 102 ... Linear steel sheet pile 20A, 24A ... Joint part 22, 104 ... Arc sheet pile 23, 106 ... Saddle plate 24 ... Guide sheet pile 30 ... Auxiliary H steel 30A ... Flange 30A1 ... Notch 30B ... Web 32 ... Mounting jig 80 ... Ground 100 ... Earth retaining wall 200, 300 ... Jacket type jetty

That is, the steel sheet pile driving method according to the present invention is a steel sheet pile in which a plurality of steel sheet piles provided with joint portions at both ends in the width direction are connected to each other at the joint portions to form a plurality of steel sheet piles. Among the steel sheet piles to be placed in a row, each of the steel sheet piles is located at both ends of each of the sheet piles, and each of the predetermined distances from the both ends toward the center of the row From the prior placing step of placing the steel sheet piles in the two end regions including the number of steel sheet piles ahead of other regions, and the length of the steel sheet pile placed in advance in the preceding placement step The guide sheet pile having a short length and joint portions at both ends in the width direction is mutually connected at the joint portion of the guide sheet pile to the central region located between the two end regions. with a plurality disposed in a row ligated onto the ground, a plurality arranged in a line shape The ends of the guide sheet piles arranged at both ends of the guide sheet piles on the side toward the central portion of the row of steel sheet piles that are driven in advance of the two end regions. The guide sheet pile arrangement step of connecting and arranging the joint portions of the steel sheet piles, and the plurality of guide sheet piles arranged in the guide sheet pile arrangement step, the width direction cross section is substantially the same as the guide sheet pile possess a replacement striking setting step of pouring sequentially replaced with steel sheet piles, and the higher the preceding hitting設工in the guide sheet pile is pouring the steel sheet pile without using the guide said guide arranged in the sheet pile arrangement step It is a steel sheet pile placing method characterized in that the sheet pile is merely placed on the ground and is not placed .

In a state in which the guide sheet pile is placed on the ground with the guide sheet pile arrangement step, the height position of the upper end of the guide sheet piles, 1m or 2m or less than the operator's foot scene to work with respect to the guide sheet pile It is preferable that the position is as high as possible.

Claims (10)

Steel sheet piles having joint portions at both ends in the width direction are connected to each other at the joint portions, and a steel sheet pile placing method for placing a plurality of steel sheet piles in a row,
Among steel sheet piles to be placed in a row, each includes steel sheet piles positioned at both ends thereof, and includes a predetermined number of steel sheet piles from both ends toward the central portion in the row. A prior placing step of placing steel sheet piles in one end region in advance;
A guide sheet pile having a length shorter than the length of the steel sheet pile previously placed in the preceding placing step and provided with joint portions at both ends in the width direction, the two end regions. The guide sheet piles arranged at both ends of the guide sheet piles arranged in a row and connected to each other at the joint portion of the guide sheet piles in a central region located between the guide sheet piles. The joint portions of the steel sheet piles placed prior to the two end regions are respectively connected to the joint portions of the steel sheet piles at the end portion toward the central portion of the row. A guide sheet pile arrangement process to perform,
The replacement placing step of sequentially placing and placing the plurality of guide sheet piles arranged in the guide sheet pile arrangement step with a steel sheet pile of a main structure whose width direction cross section is substantially the same as the guide sheet pile,
A method for placing a steel sheet pile, comprising:   2. The steel sheet pile driving method according to claim 1, wherein a plurality of the steel sheet piles arranged in a single row have substantially the same cross-section in the width direction.   In the replacement placing step, a guide sheet pile that is a part of the plurality of guide sheet piles arranged in the guide sheet pile arrangement step and that is not adjacent to each other is selected to the main steel sheet pile. The method for placing a steel sheet pile according to claim 1 or 2, further comprising a step of placing by replacing.   In the replacement driving step, the main steel sheet pile is selected by selecting one guide sheet pile among the plurality of guide sheet piles arranged in the guide sheet pile arrangement step. The method for placing a steel sheet pile according to claim 3, wherein a step of placing the steel sheet pile is included.   In the replacement driving step, the main steel sheet pile is selected by selecting a guide sheet pile that is a part of the plurality of guide sheet piles arranged in the guide sheet pile arrangement step. The method for placing a steel sheet pile according to claim 3, wherein a step of placing the steel sheet pile is included.   The steel sheet pile placing method according to any one of claims 1 to 5, wherein the positions of both ends of the steel sheet piles to be placed in a row are determined in advance.   The steel sheet pile placing method according to any one of claims 1 to 6, wherein a cross section in the width direction of the steel sheet pile has a substantially linear shape.   The steel sheet piles according to any one of claims 1 to 7, wherein at least some of the steel sheet piles to be placed in a single row form a curved line. Installation method.   The play of the steel sheet pile according to any one of claims 1 to 8, wherein a play of the joint portion of the steel sheet pile is 8 mm or more and 12 mm or less.   In the state where the guide sheet pile is arranged on the ground in the guide sheet pile arrangement step, the height position of the upper end of the guide sheet pile is only 1 m or more and 2 m or less than the foot scene of the operator who performs work on the guide sheet pile. The steel sheet pile placing method according to any one of claims 1 to 9, wherein the steel sheet pile is at a high position.

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