JP4450240B2 - Joining structure of mountain retaining H-shaped steel pile and its joining method - Google Patents

Description

  The present invention relates to a joining structure of a mountain retaining H-shaped steel pile and a joining method thereof, and proposes a joining method capable of changing the cross-sectional performance of the mountain retaining H-shaped steel pile in the depth direction. The purpose is to reduce the cost of steel piles.

  Generally, the root cutting and earth retaining work that is performed to construct an underground structure is complicated in terms of material, and the difficulty of construction varies depending on the ground conditions of the construction site and the presence or absence of groundwater. Traditionally, it has been regarded as one of the most difficult steps in building construction.

  In recent years, construction costs have been reduced when returning to an area that is convenient for access, while a retaining wall has been built in a position very close to adjacent existing buildings in order to make effective use of the site area. Building things is done.

FIG. 11 and FIG. 12 are proposed in the past, and are the connection method of the upper pile 2 and the lower pile 1, and the flange width w · w ′ is substantially the same, but the web height of the upper pile 2 and the lower pile 1 Because h and h 'are different, when the H-shaped steel pile is built in the bore diameter 5 by the soil cement column wall machine (3-axis auger), the center of gravity of the H-shaped steel pile is shifted. There is a problem that the embedding accuracy is lowered.

  FIG. 13 is a sectional view showing a conventional earth retaining method. Usually, H-shaped steel parent piles (earth retaining piles) 11 whose cross-sectional performance does not change in the length direction are driven in, and a horizontal sheet pile (sanki) is fitted between the piles to support them by raising them upside down (cutting beams) Excavate the earth retaining wall (not shown). In soft ground, a soil cement column wall with H-shaped steel as the core material is created by installing separate holes, all holes, or a combination of these, but all use H-shaped steel piles that have no change in cross-sectional performance in the length direction. Has been.

  As shown in FIG. 14, when the web height H of the retaining pile 11 is 350 mm, the ordinary retaining wall is a half of the web height of the retaining pile 11, that is, the auger core 41 of the SMW machine, that is, the outer layer of the frame. Set a position about 16 to 175 mm away and drill a hole, and install the retaining pile 11 in the auger hole 41. If the distance between the outer skeleton 16 and the site boundary line B is 270 mm, the soil retaining pile 11 comes out of the site boundary B by a distance F, that is, F = 350 mm−270 mm = 80 mm. Getting out of the site boundary is an act that is not allowed morally or legally.

Therefore, conventionally, as shown in FIG. 15, the auger core 41 ′ has been moved so that the outer surface of the flange of the retaining ring 11 is in contact with the site boundary line B. As a result, the housing outer layer 16 planned in the design drawing is redesigned to a distance of F, that is, F = 80 mm set back (reference numeral 16 ′). Thus, it is a serious problem that affects the structure of the upper part to reduce the size of the underground structure by redesigning it.
On the other hand, the following inventions are provided in order to solve the above conventional problems.
Invention of JP 2002-021081 A Invention of JP-A-8-60741 Invention of JP-A-2003-342948

  In the above-mentioned “Patent Document 1”, when the upper end portion of the retaining wall is removed, the cutting work of the steel core material can be omitted, and another wall body is not provided on the back side of the retaining wall. However, the object is to provide a retaining wall that can sufficiently resist earth pressure near the ground surface.

  In addition, in the retaining wall formed by embedding a core material made of steel on the soil cement column wall, a notch is provided at the upper end of the core material, and the soil cement that needs to be removed for construction such as underground construction The solution means that a notch portion of the core material is arranged in the part.

  Next, “Patent Document 2” aims to make it possible to easily and firmly join the upper and lower columns made of H-shaped steel having different thicknesses, even if the difference in the width dimension is large.

  Then, a portion that is wider than the upper column at the upper end of the lower column is cut off obliquely to a width that substantially matches the width of the upper column to form a tapered notch. Reinforcing hardware is joined to the upper end of the web of the lower column with bolts. The reinforcing hardware is made of an angle material or the like, and its flange is projected on both sides along the edge of the tapered notch. A folded plate-like inner side plate and outer side plate are overlapped on the inner and outer surfaces across the flange of the upper column, the flange of the reinforcing hardware, and the flange of the lower column. The solution means is to join these inner and outer attachment plates together with each flange portion sandwiched between both attachment plates with bolts.

  In “Patent Document 3”, a soil retaining pile having a changed cross-sectional performance in the length direction is built near the site boundary, and the upper structure is made larger than the root by using an upper pile having a small cross-sectional performance. The purpose is to provide a soil retaining method that enables effective use of the site area.

  Then, prepare the earth retaining pile whose cross section performance is changed by joining the H section steel upper pile whose base section length is below the reference section to the reference section H section steel lower pile and checking the length direction. . An end plate is arranged at the opposite end of the upper and lower piles, and the attachment plate is fixed to the flange surface of the upper and lower piles on the side receiving the side pressure. Pile is built at a position within the boundary of the site, and a horizontal sheet pile is inserted between each pile, and after excavating the underground area while forming a retaining wall, along the inner flange surface of the upper pile with reduced cross-sectional performance with respect to the lower pile The solution is to build the outer layer of the underground structure.

  By the way, in Patent Document 1, the reinforcing material of the H-shaped steel material serving as the upper pile connected to the H-shaped steel material serving as the lower pile has the same lateral width of the flange as the H-shaped steel material and the reinforcing material. The height of the web is lower in the reinforcing material of the H-shaped steel material that becomes the upper pile than the H-shaped steel material that becomes the lower pile.

  Further, in Patent Document 2, the flange width is the same for both the flange of the lower pile and the upper column, but the H-shaped steel material that is the upper column connected to the H-shaped steel material that is the lower column is the lower column. The web height is lower.

Further, in Patent Document 3, in FIG. 10, the width w ′ of the flange 2 ₁ ′ of the upper pile is shorter than the width w of the flange 1 ₁ ′ of the lower pile 1, and the web height is also the web of the lower pile. The web height h ′ (between the upper and lower webs 2 ₁ and 2 ₁ ′) of the upper pile 2 is lower than the height h (between the upper and lower webs 1 ₁ and 1 ₁ ′).

Therefore, when it built up the pile 1 and 2 of the upper and lower H-shaped steel in the above patent document in drilling diameter 5, upper pile body 2 is a cross-sectional rigidity small, large next lower pile body 1 is a cross-sectional rigidity and, impossible construction in contact with the lateral end portions w ⁿ auger soil cement pillar column wall method for machine (○ frame r portion of FIG. 10) is drilling a drilling diameter 5 of the flange w of the upper pile body 2 Therefore, it was necessary to make the construction possible even when the size of the H-shaped steel pile was changed up and down.

  The present invention relates to the above-described conventional structure by combining and combining the sizes of the H-shaped steel with the flange width changed without extremely changing the web height of the H-shaped steel in the joint structure of the retaining H-shaped steel pile and the method of using the same. It is intended to solve technical problems.

  1st of this invention WHEREIN: In the joining structure of a mountain retaining H-section steel pile, among the H-section steel piles arrange | positioned in a length direction, the web height of one pile changes almost with respect to the web height of the other pile. The dimensions of the piles are such that the flange width of the other pile is changed with respect to the flange width of one pile, and the flanges on both sides of both piles in the length direction are aligned with each other. Are connected and fixed.

  2nd of this invention WHEREIN: One side pile is made into a lower pile, and the other pile is made into an upper pile among the H-section steel pile arrange | positioned in the length direction upper and lower in the joining structure of a mountain retaining H-section steel pile, The upper pile web height is approximately the same as the pile web height, the upper flange width is shorter than the lower pile flange width, and the flanges on one side of the upper and lower piles face each other. The end surfaces of the lower pile and the upper pile are connected and fixed to match.

3rd of this invention WHEREIN: In the joining structure of a mountain retaining H-section steel pile, among the H-section steel pile bodies arrange | positioned at the upper and lower sides of a length direction , one pile is made into a lower pile, the other pile is made into an upper pile, The web height of the lower pile is the same dimension as the web height of the pile, the flange width of the upper pile is shorter than the flange width of the lower pile, and the flanges on one side of the upper and lower piles face each other The end surfaces of the upper pile and the lower pile are connected and fixed with a joint member .

4th of this invention WHEREIN: In the joining method of a mountain retaining H-section steel pile, the lower pile of H-section steel is arrange | positioned at the lower rank of a perpendicular | vertical length direction, respectively, and the upper pile of H-section steel is each arrange | positioned, while the dimensions of approximately the same web height with respect to the web height, providing a pile on which the short dimension to the flange width of the lower pile, for soil cement pillar column wall method of soil cement pillar column wall method In the state where the lower pile is built within the drilling diameter drilled by the machine and the upper end of the lower pile is arranged in the vicinity of the drilling opening surface, the flange outer surface on one side of the upper pile is the same as the flange outer surface on one side of the lower pile After connecting and fixing in a state matched to the surface, the construction of the connected pile body is continued.
The above " Soil cement column wall construction machine " means that it is an underground wall (Wall) that is achieved by mixing and mixing soil (Soil) and cementitious suspension in situ. soil cement pillar column wall method for machine "means a drilling machine by triaxial auger for carrying out the soil cement pillar column wall method.

5th of this invention WHEREIN: In the joining method of a mountain retaining H-section steel pile, the pile which made the lower H-section steel of the perpendicular | vertical length direction arrange | positions the upper pile of the H-section steel in the upper rank, respectively, Prepare an upper pile with the same web height as the web height and a shorter dimension than the flange width of the lower pile, and drill it with the soil cement column wall construction machine . In the state where the lower pile is built in and the upper end of the lower pile is located in the vicinity of the hole opening surface, the flange outer surface on one side of the upper pile is connected and fixed with the same surface as the flange outer surface on one side of the lower pile. After that, the construction of the connection pile is continued.

Since the present invention has the above-described configuration, the following effects can be obtained.
(1) As an embodiment of a mountain retaining H-shaped steel pile adapted to changes in stress generated by earth pressure, a H-shaped steel pile with high rigidity is used for the maximum stress generating part, and it is adapted to the part where the stress is small Cost can be reduced by using H-section steel.
(2) As an embodiment of a mountain retaining H-shaped steel pile adapted to changes in the amount of deformation caused by earth pressure, a portion having a small amount of deformation using a high-rigidity H-shaped steel pile in the portion where the maximum displacement is generated The cost can be reduced by using H-shaped steel piles suitable for it.
(3) Eliminate the problem of building accuracy of Yamadome H-shaped steel piles. That is, in the present invention, as a problem of the joint method of the upper pile and the lower pile, in the present invention, with respect to the problem of deterioration in the built-in accuracy due to the deviation of the center of gravity of the Yamato H-shaped steel pile, the present invention has substantially the same web. By connecting and fixing the H-shaped steel of the height with the joint member, it is possible to improve the deterioration of the built-in accuracy due to the deviation of the center of gravity of the mountain retaining H-shaped steel pile.

  In the present invention, the best mode for carrying out this in the above configuration is as follows.

  FIG. 1 is a cross-sectional view of the upper and lower piles in the joint structure of mountain retaining H-shaped steel piles according to the present invention, which shows whether the upper and lower H-section steels are built in the bore diameter 5 drilled from the ground surface toward the ground. The upper and lower piles 1 and 2 are arranged substantially vertically at a substantially central position within the bore diameter. This is because the web widths h and h 'are set to be the same although the flange widths w and w' made of the upper and lower H-shaped steel materials used for the upper and lower piles are slightly different. It becomes the center of the web height, and the perpendicularity of the H-shaped steel material is maintained.

1-4, 1 is a lower pile made of H-shaped steel, 2 is an upper pile made of H-shaped steel, and the web height h 'is the same as or substantially the same as the height h of the lower pile 1. The left and right widths w ′ of the upper and lower flanges 1 ₁ and 1 ₂ are set to be narrower (shorter) by about one-half to one-third of the width w of the lower pile 1. ₁・ 2 ₁ is the surface position. 3 is a joint member for connecting and fixing the upper and lower ends of the upper and lower pile bodies 1 and 2, and 4 is a fixing rod member.
In FIGS. 5 to 7, the upper and lower piles of FIGS. 1 to 4 are arranged in reverse, and the joint ends of both piles 1 and 2 are connected and fixed by the joint member 3 and the fastening rod 4. Shows what

"Specific work process examples"
(1) “Embodiment of Yamadome H-shaped steel pile adapted to changes in stress generated by earth pressure” (FIGS. 1 to 4)
When arrayed mountains cut pile in the depth direction from the ground surface G.L in drilling diameter 5 was drilled with soil cement pillar column wall method for machine built up the upper and lower H-shaped steel piles, the inner In a low ground G.L 'having a predetermined height difference A from the ground surface G.L, a stress change curve .alpha. That is, the cross-sectional rigidity of the lower pile 1 is increased. On the other hand, the cross-sectional rigidity of the upper pile 2 in the upper half part from the joint member 3 is small.

(2) “Embodiments of piles made of piled H-shaped steel suitable for changes in deformation caused by earth pressure” (FIGS. 5 to 7)
When the upper and lower H-shaped steel piles 1 and 2 are installed in the drilling hole diameter 5 drilled in the depth direction from the ground surface GL and the piled piles are lined up, it is determined from the ground surface GL on the inside. In a low ground GL ′ having a height difference A ′, a stress change curve β generated in the pile pile is generated as shown in FIG. That is, the width w of the flange 2 ₁ 'is narrower pile than the width w of the flange 1 ₁ counterparty to the lower pile 1, sectional rigidity of the bottom pile becomes small. On the other hand, the cross-sectional rigidity of the upper pile 2 in the upper half part from the joint member 3 is increased.

(3) “Embodiment for improving the accuracy of building piles in Yamadome H” (FIGS. 8 and 9)
The flanges w and w 'are different, but the web heights h and h' are almost the same. The upper pile 2 and the lower pile 1 are connected by a joint member 3 and are built in a bore diameter 5 obtained by drilling an H-shaped steel. At that time, it is built along the center line, and the deterioration of the built-in accuracy due to the deviation of the center of gravity of the Yamadome H-shaped steel is improved.

The cross-sectional view of the up-and-down pile in the junction structure of the mountain retaining H-section steel pile which concerns on this invention. The front view which shows the connection fixed part of the upper and lower pile which connected the upper pile of the flange width narrower than the flange width of a lower pile in the height direction. FIG. 4 is a side view of FIG. 3. The side view which shows the change curve of the cross-sectional rigidity of FIG. The front view which shows the connection fixed part of the up-and-down pile which the lower pile connected in the state whose flange width is shorter than an upper pile. The side view of FIG. The side view which shows the change curve of the cross-sectional rigidity of FIG. The longitudinal cross-sectional view which shows the erected state of the connected upper and lower piles by this invention. FIG. 9 is an enlarged cross-sectional view of FIG. 8. The cross-sectional view of the upper and lower piles in the joining structure of the conventional mountain retaining H-section steel pile. FIG. 9 is a longitudinal cross-sectional view of a state where upper and lower piles connected in a conventional height direction that have a problem due to a shift in the center of gravity compared to FIG. The enlarged cross-sectional view of FIG. 11 which has a subject by the shift | offset | difference of a gravity center compared with FIG. Sectional drawing which shows the conventional earth retaining method. The enlarged plan view of the retaining pile part in FIG. The enlarged plan view of the state which changed the plan auger core in FIG. 14, and put the earth retaining pile in the site boundary line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lower pile which consists of H-shaped steel materials 2 ... Upper pile which consists of H-shaped steel materials 3 ... Joint member 4 ... Tightening rod 5 ... Drilling hole diameter h / h '... Web height w / w' ... Flange width

Claims (5)

Of the H-shaped steel piles (1) and (2) arranged in the length direction, the web height (h) of one pile (1) is set to the web height (h ') of the other pile (2) The width (w ′) of the flange (2 ₁ ) of the other pile (2) is changed with respect to the width (w) of the flange (1 ₁ ) of one pile ( ₁ ). And the flanges (1 ₁ ) and (2 ₁ ) of each side of both piles in the length direction are aligned with the surface position, and the end faces (1 ₁ ′) and (2 ₁ ′) of both piles (1) and (2) A joint structure of piled H-shaped steel piles, characterized in that they are connected and fixed together with a joint member (3). Of the H-shaped steel piles (1) and (2) arranged at the top and bottom in the length direction, one pile is the lower pile (1), the other pile is the upper pile (2), and the lower pile (1) The web height (h ′) of the upper pile (2) has the same dimensions for the web height (h) of the upper pile (2) and the upper pile (2) for the width (w) of the flange (1 ₁ ) of the lower pile (1) the width of the flange 2) (2 ₁₎ and (w ') and has a narrow dimension, and one side of the flange in the vertical pile (1 ₁₎ (2 ₁₎ were combined with each other in the surface position, a lower pile (1) above A joint structure of piled H-shaped steel piles, characterized in that the end faces (1 ₁ ′) and (2 ₁ ′) of the pile (2) are connected and fixed by a joint member (3). Of the H-shaped steel piles (1) and (2) arranged at the top and bottom in the length direction, one pile is the lower pile (1), the other pile is the upper pile (2), and the lower pile (1 The web height (h ′) of the lower pile (2) has the same dimensions as the web height (h) of the upper pile, and the upper pile with respect to the width (w) of the flange (1 ₁ ) of the lower pile (1) (2) of the flanges and have a narrow dimension width (w ') of the (2 _1), and one side of the flange in the vertical pile (1 ₁₎ (2 ₁₎ were combined with each other in the surface position, the upper pile (2) A joint structure of piled H-shaped steel piles, characterized in that the end faces (1 ₁ ′) and (2 ₁ ′) of the lower pile (1) are connected and fixed together by a joint member (3). Place the lower pile (1) of the H-shaped steel in the lower part of the vertical length direction and the upper pile (2) of the H-shaped steel in the upper part, and the web height (h) of the lower pile (1) as well as the dimensions of the same web height (h ') Te, to prepare the pile (2) after having a narrow have dimensions with respect to the flange width of the lower pile (1) (w), by soil cement pillar column wall method In the state where the lower pile (1) is installed in the drilled hole diameter (5) and the upper end of the lower pile (1) is arranged in the vicinity of the hole opening surface, the flange on one side of the upper pile body (2) Hook-shaped H type characterized in that after the outer surface is aligned with the flange outer surface on one side of the lower pile (1) and connected and fixed by the joint member (3), the connection pile body is continuously built Steel pile joining method. Place the lower pile (1) of the H-shaped steel in the lower part of the vertical length direction and the upper pile (2) of the H-shaped steel in the upper part, and the web height (h) of the lower pile (1) as well as the dimensions of the same web height (h ') Te, to prepare the pile (2) after having a narrow have dimensions with respect to the flange width of the lower pile (1) (w), by soil cement pillar column wall method In the state where the lower pile (1) is built in the drilled hole diameter (5) and the upper end of the lower pile (1) is arranged in the vicinity of the hole opening surface, the joint member (3 ) After connecting and fixing in (), the construction method of the piled H-shaped steel pile is characterized by continuing the construction of the connected pile.