JP6535558B2 - Stomach - Google Patents

Description

  The present invention relates to an uprising installed inside a retaining wall, and it is possible to easily increase the bending strength and the shear strength of the beam as needed to increase the bending strength and shear strength of the beam and to support the uprising. The amount of support materials used, such as sparks and beams, can be reduced significantly.

  In rooting work in construction and civil engineering work, it is necessary to prepare for the collapse of the ground due to excavation, and in general, as shown in FIG. 10, H-shaped steel or sheet pile is driven into the ground to construct the retaining wall 20, Along with the excavation of the ground, a piled retaining support consisting of a rising 21, a cut beam 22, a casted beam 23 and the like is temporarily installed inside the rocking wall 20 to prevent the collapse of the ground.

  The upset 21 is horizontally attached to the inside of the retaining wall 20 and is subjected to earth pressure acting on the retaining wall 20. In addition, the cutting beam 22 is installed between the facing uplifts 21 and 21 and receives earth pressure acting via the uplifting 21.

  Main members mainly made of H-shaped steel are mainly used because of long years of experience, etc., and easy availability as compared with other steel materials.

  In particular, H-300 x 300 to 400 x 400 is generally used for belly 21 and H-500 x 500 may be used particularly when the reaction force is large. It is considered the limit.

  By the way, although the use of the cutting beam 22 and the hammering beam 23 makes the span of the upswing 21 shorter and the supporting force increases, the working space, the opening space A for carrying out the excavated soil and the material carrying in / out is narrow. As a result, there is a problem that the suspension work and the excavation work are disturbed, and the cost of the supporting material increases due to the frequent use of the cutting beam 22 and the cast-in beam 23.

  For this reason, various methods have been proposed to increase the strength (mainly bending strength and shear strength) of the raised part 21 and to reduce the installation of the cutting beam 22 and the striking beam 23 as much as possible. For example, Patent Document 1 discloses a single end beam made of high strength steel in the middle section where a maximum bending moment and a maximum shear force are generated, and an end overlapping beam made of a general structural steel at both ends. Composite vents are disclosed, each of which is arranged and integrally joined with the central single beam and the end overlapping beam.

Further, Patent Document 2 discloses a method of introducing a pre-stress by laying up a separate belly as a lap beam inside the belly, and stretching a cable in the superimposed belly. ing.

JP, 2014-159711, A Japanese Patent Application Laid-Open No. 50-47410 Japanese Utility Model Publication No. 07-38228

  However, the method of installing the uprising on the inside of the retaining wall and installing the cut beam and the joist on the inside to support the retaining wall is naturally limited to the resistance of the uplift, so the existing belly There were times when it was not enough to cope with the occurrence.

  For this reason, supporting materials such as cutting beams and hammer beams are used extensively, and as a result, an opening space A for carrying out the work space in the retaining wall and excavated soil or carrying in and out the material (see FIG. 10) Could cause problems in drilling work.

  Further, the composite belly disclosed in Patent Document 1 has problems such as high manufacturing cost due to the use of high strength steel, and the cable is stretched in the belly disclosed in Patent Document 2. It is necessary to carry in the equipment to install and introduce prestress into the site, and it is also necessary to manage the prestress to be introduced properly, which requires a lot of time and labor, and the cost is high. And other issues.

  The present invention has been made to solve the above problems, and it is possible to easily increase the bending strength and the shear strength of the beam by increasing the beam formation as needed, whereby cut beams, fired beams, etc. The purpose of the present invention is to provide an upset that can significantly reduce the amount of support material used.

  The present invention is an invention of an upset placed inside a retaining wall, and the bending strength and the shear strength of the upset can be easily increased by increasing the beam formation as needed. The amount of supporting materials used for supporting the uplift, such as cutting beams and beams, can be significantly reduced, and the first stage main retaining members installed inside the retaining walls, and the first step A second-tiered pile main member laminated on the inner side of the pile main member, a plurality of adjustment members interposed between the first-tiered and second-tiered pile main members, and the first-tiered and second-tiered piles A plurality of fastening bolts for joining the main material and the adjustment material to each other are provided, and the first and second step pile main members are laminated so that both webs are positioned in the same horizontal plane, and the first step , Second step pile main members and the adjustment material by the plurality of fastening bolts And it is characterized in that formed by joined by sintering.

  The adjustment materials may be omitted, and the main stay members of the first and second stages may be directly laminated and directly joined by a plurality of fastening bolts. In addition, existing main retaining bars can be used for the first and second steps main retaining bars, and they can also be formed from existing H-section steels.

  As the adjusting material, an existing adjusting material (adjusting piece) used for adjusting the length of the pile main material can be used, and it can also be formed from an existing H-shaped steel, channel steel or flat steel plate. . In addition, it is desirable to use a high strength bolt (HTB) for the fastening bolt.

  Note that the main retaining members for the first and second steps are installed adjacent to each other in the axial direction, and the main retaining members for adjacent retaining members are joined together to freely correspond to the length of the retaining wall. be able to.

  In addition, by bonding the adjacent main retaining members of the first stage and the second stage at different positions in the axial direction, it is possible to minimize the reduction in the strength of the abdominal rise due to the provision of the joint portion.

  Also, at that time, the end of the cut beam inside the second-stage pile main material between the joint of the first-stage adjacent pile main material and the joint of the second-stage adjacent pile main material Can be supported at the same time as reinforcing the joint portion of the protuberance by connecting the two protuberances and installing the joists on both sides thereof.

  Furthermore, a joining plate for joining the second-tiered pile main materials by joining the adjacent ones of the second-tiered piled main members together with the burned-out piece and joining the end of the cutting beam to the corresponding flared piece. Fire beams can be omitted.

  Thus, according to the stress acting on the retaining wall, the main retaining members are joined together and supported by the cutting beam and the punched piece, so that the strength according to the stress acting on the retaining wall is reinforced firmly and firmly can do.

  According to the present invention, the first-tiered main retaining material is installed on the inner side of the retaining wall made of sheet pile or the like, the second-tiered main retaining member is laminated on the inner side, and both retaining main members are By connecting integrally with a plurality of fastening bolts, it is possible to increase the beam structure in the form of a composite beam to easily increase the bending strength and the shear strength of the protuberance, thereby supporting the protuberance. The amount of support materials used, such as sparks and beams, can be reduced significantly.

  In addition, even if the beam formation of the first stage and the second stage main retaining members is small, by interposing a plurality of adjustment materials between the first step and the second main retaining members and raising the beam construction, the beams are small The beam formation as a whole can be easily enlarged. Furthermore, it is very economical because it is possible to use existing pile main material, H-shaped steel, etc. as the main pile material.

FIG. 7 is a perspective view of an embodiment of a raised up placed inside a pile wall consisting of sheet piles. FIG. 2 (a) is a plan view of the protuberance in FIG. 1, and FIG. 2 (b) is a cross-sectional view taken along the line a-i in FIG. 2 (a). 3 (a), (b) and (c) are plan views of the ups and downs in FIG. 4 (a), 4 (b) and 4 (c) are plan views of the ups and downs in FIG. It is a perspective view which shows other embodiment of the protuberance installed inside the piled wall which consists of sheet | seat piles. FIG. 6 (a) is a plan view of the protuberance in FIG. 5, and FIG. 6 (b) is a cross-sectional view taken along the line in FIG. 6 (a). FIGS. 7 (a), (b) and (c) are plan views of the ups and downs in FIG. 8 (a), 8 (b) and 8 (c) are plan views of the ups and downs in FIG. It is explanatory drawing which shows the method of the bending strength test of an upset. It is a top view of the support that supports the retaining wall and the retaining wall.

  FIGS. 1 to 4 illustrate one embodiment of an upset installed inside a pile wall made of sheet pile or the like.

  The ups and downs 1 are two of the first pile main member 3 horizontally attached to the inside of the pile wall 2 and the two horizontally laminated in the axial direction of the pile main member 3 inside the pile main material 3. It is comprised from the step main part 4 and the several adjustment materials 5 interposed between the main part 3 of a mountain stay, and the main subject 4 of a mountain stay.

  The main clasp 3 and the main clasp 4 are formed to have the same cross-sectional dimension and length, and a plurality of bolt holes 6 are formed at equal intervals in the axial direction in the flange 3a and the flange 4a of the main clasps 3 and 4, respectively. Furthermore, end plates (not shown) are attached to both ends.

  Further, the main clasp 3 and the main clasp 4 are laminated so that both ends are flush with each other and both the webs 3 b and 4 b are positioned in the same horizontal plane. In addition, the existing main retaining members can be used for the main retaining members 3 and 4 and can also be formed from the existing H-shaped steel.

  The adjusting member 5 is a member between the main clasp 3 and the main clasp 4, and is a member for increasing the beam formation of the uplift 1 and is interposed between both ends of the main clasps 3 and 4 and at a predetermined interval therebetween. It is done.

  Further, the adjustment member 5 is formed to have the same width as the main clasps 3 and 4 and has an optimum height according to the required beam configuration of the upswing 1 among a plurality of types having different heights. It is interposed between the main material 3 and the pile main material 4.

  Furthermore, the adjusting member 5 is formed into a box shape, an H shape, a groove shape or the like as viewed in the axial direction of the belly 1 and may be H shaped by, for example, holding two groove members back to back. The shape is not particularly limited. Further, the length of the adjusting member 5 is not particularly limited, and can be adjusted by the degree of integration of fastening by fastening bolts, and is formed to be approximately 1.0 m in length.

  Further, a plurality of bolt holes 7 are formed at the same intervals as the bolt holes 6 of the flange 3a and the flange 4a in the flanges 5a and 5b respectively in contact with the flange 3a and the flange 4a of the pile main members 3 and 4, respectively.

  The main fastening members 3 and 4 and the adjustment members 5 are integrally joined by fastening the fastening bolts 8 to the corresponding bolt holes 6 and 7 respectively.

  In addition, the existing adjustment material (adjusting piece) used for adjustment of the length of the main retaining member in the pile work, etc. can be used as the adjustment material 5, and the existing H-shaped steel, channel steel or band is used. It can also be formed of steel. Also, in principle, high strength bolts (HTB) are used for the fastening bolts 8.

  A plurality of ups and downs 1 configured in this manner are disposed axially adjacent to each other on the inner side of the upswing wall 2 in accordance with the length of the upswing wall 2, and each adjacent ups and downs 1, 1 The parts are butted together and joined together.

  Adjacent flanks 1, 1 are fastened by joining plates 9 and a plurality of fastening bolts 10, respectively, between the ends of flanges 3a, 3a of pile main members 3 and 4 and the ends of flanges 4a, 4a. Furthermore, both end plates (not shown) are integrally joined by bolting together. In addition, the adjustment material 5 may be used instead of the joining plate 9.

  Then, as illustrated in FIG. 2 and FIG. 3A, the end of the cutting beam 11 is joined to the inside of the piled main member 4 of each of the joined uplifts 1 and 1, and both sides of the cutting beam 11 are The beams 12 and 12 are installed symmetrically in the left and right.

  Further, among the left and right joist beams 12, 12, the flanks of the flanks on the flank side of the flank beams 1 particularly installed on the flank side are adjacent to each other on the inner side of the pile main member 4 of the flank 1 (Fig. 2 (a)). That is, the hammer beams 12 installed on adjacent flanks are installed across the adjacent main retaining members 4 and 4.

  By installing the cutting beam 11 and the left and right beams 12 and 12 in this manner, the number of cutting beams 12 and connecting bolts can be reduced, and the opening A (see FIG. 10) can be widened. The joints 1 and 1 can be reinforced by the cutting beams 11 and the striking beams 12.

  In FIG. 3 (b), the end portions of the cut beams 11, 11 are joined to the inside of the main clasp members 4 of each of the joined uplifts 1, 1, and the connection between the cut beams 11, 11 is performed. Beams 13 are constructed, and fire beams 12, 12 are installed symmetrically on the outer side of each of the cut beams 11, 11. By doing this, it is possible to reinforce each of the joints of the upset joints 1 and 1.

  Further, in FIG. 3 (c), the ends of the main members 4 and 4 of the joined ups and downs 1, 1 in particular are in the form of a triangle when viewed from above, and viewed in the axial direction of the ups and downs 1 For example, they are joined by a squirting piece 14 formed in a rectangular shape, and the end of the cutting beam 11 is joined to the inside of the pile main material 4 of the protuberance 1 through the squirting piece 14 concerned. As the batter piece 14, an existing batter piece can be used. By doing this, the number of cutting beams 11 can be reduced, and the hammer beams 12 and the joining plate 9 can be omitted.

  Further, in FIGS. 4A to 4C, in the joint portion of each adjacent raised part 1, 1, the joint part of the main part 3 and 3 and the joint part of the main part 4 and 4 are raised. By providing them at different positions in the axial direction of 1, it is possible to prevent a reduction in the strength of the upset due to the provision of the joint.

  FIGS. 5-8 illustrate other embodiments of a proboscis installed inside a pile wall made of sheet pile or the like.

  In the figure, the uprising 1 is a first-tier main retaining member 3 horizontally attached to the inside of the retaining wall 2 and a second-tier retaining directly laminated inside the first-tier main retaining member 3. The main material 4 is composed.

  A plurality of bolt holes 6 are formed at equal intervals in the axial direction respectively in the flange 3a and the flange 4a of the pile main members 3 and 4, and end plates (not shown) are attached to both ends.

  Further, the main clasp 3 and the main clasp 4 are laminated so that both ends are flush with each other and both the webs 3 b and 4 b are positioned in the same horizontal plane. The two bolt holes 6 are integrally joined by tightening the fastening bolts 8. A high strength bolt (not shown) is used as the fastening bolt 8.

  The other structures such as the connection between the adjacent upliftings 1 and 1 and the installation of the cutting beam 11 and the striking beam 12 and the striking piece 13 are substantially the same as the embodiment described in FIGS. 1 and 2.

  7 and FIG. 8 are also shown in FIG. 3 and FIG. 4 except that the main retaining members 3 and 4 are directly joined by a plurality of fastening bolts 8 without the adjustment member 5 interposed therebetween. It is almost the same as the described embodiment.

  In addition, Table 1 shows the ups and downs formed by laminating the first-tier main retaining members and the second-tier main retaining members and fastening them with a plurality of fastening bolts (Figs. 1 and 2); FIG. 9 shows the results of a bending strength test (FIG. 9) carried out on an upswing constituted by simply laminating the main piled timber of the second stage and the main pile of the second stage.

  H-250 × 250, H-300 × 300, H-350 × 350, H-400 × 400 are used as main anchors, and a bending strength test is conducted on the upset of these four main anchors. did. FIG. 9 shows the method of a bending strength test.

  Fastening bolts used high strength bolts (HTB) in consideration of the cost and labor of the bolts, and the main retaining members were fastened at intervals of 30 cm or at intervals of 20 cm.

  From the test results (Table 1), if tightening at the bolt intervals in Table 1, the upset (overlapping synthetic upset) of the present invention is formed, and in each case, the pile main members are simply overlapped. The bending strength is improved by about 17% or more in the case of the upset that is fastened by the plurality of fastening bolts rather than the upset.

  Generally, when the diameter of the fastening bolt is the same, the number of bolts increases as the cross-sectional shape of the main clasp increases, the bolt interval narrows, and the cross-sectional shape of the main clasp decreases. The smaller the distance, the wider the bolt spacing.

  The present invention can increase the beam structure as needed to easily increase the bending strength and the shear strength of the beam, and reduce the number of supporting materials such as cut beams and fire beams that support uplift. be able to.

Reference Signs List 1 belly up 2 mountain retaining wall 3 first stage retaining main material 4 second stage retaining main material 5 adjustment material 6 bolt hole 7 bolt hole 8 fastening bolt 9 joining plate
10 Fastening bolt
11 cut beams
12 打
13 connecting beams
14 fire hitting pieces

Claims (5)

An uprising installed on the inner side of the retaining wall, and a main retaining member for the first stage installed on the inner side of the retaining wall, and a retaining for the second step stacked on the inner side of the main retaining rod for the first step A main member and a plurality of fastening bolts for joining the first and second step main members to each other, the first and second step main members being made of H-shaped steel, web What happened is laminated so as to be positioned in the same horizontal plane, and said flange to each other in contact with each other first and second stages of the earth retaining main material, the plurality of fastening over the longitudinal direction of the length of the earth retaining main members Upset characterized by being equally spaced by bolts. In claim 1 wale of, wherein the first and second stages of the earth retaining main material, a plurality located adjacent to each other in the axial direction, and the first stage adjacent said and second stage of the earth retaining main members each other Each is characterized by being joined to each other . In wale according to claim 2, wale said first and second stages of the earth retaining main members each other is characterized in that it is joined together in different positions in the axial direction. In wale according to claim 3, and the joint portion of the earth retaining main member each other of the first stage, the inner side of the earth retaining main member of the second stage between the joint portion of the earth retaining main member each other of the second stage An upset characterized in that the end portions of the cutting beams are joined, and the striking beams are installed on both sides thereof. 5. The uprising according to claim 3 or 4, wherein said second-tier main retaining members are joined by a burning piece, and an end of a cutting beam is joined to said burning piece. I see.

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