JP4533371B2 - Embankment structure and construction method thereof - Google Patents

Description

  The present invention relates to an embankment structure and a construction method thereof.

As a conventional embankment structure, for example, the invention of JP-A-2002-242186 is known. In this embankment structure, wall panels are stacked on the foundation block in the lower part of the slope ground, and there is an embankment layer in which banking materials are stacked in multiple stages with a reinforcing material interposed between the wall panel and the slope ground. The asphalt roadbed is formed on the upper surface of the embankment layer. The wall surface panel is fastened by a connecting member in the vertical direction and fixed to the foundation block.
JP 2002-242186 A

  However, the above-mentioned embankment structure has a problem that when a large earthquake occurs, the position and inclination of the wall panel fixed to the foundation block occur, or the retaining wall, embankment layer and asphalt roadbed break. It was.

  The present invention has been made in view of these problems, and the purpose of the present invention is to provide positional displacement and inclination of the wall panel constituting the retaining wall, retaining wall, embankment layer and asphalt roadbed even when a large earthquake or the like occurs. An embankment structure capable of preventing destruction and a method for constructing the same are provided.

The embankment structure for solving the above problems is a retaining wall formed by stacking precast concrete panels on the foundation block at the bottom of the slope ground, and a multi-stage embankment material between the retaining wall and the slope ground An embankment layer laminated on the slope, a slope counter block formed on the slope ground in the upper part of the embankment layer, and a PC floor board installed over the top surfaces of the slope counter block, the embankment layer, and the retaining wall The tension material is constructed, and the PC floor plate penetrates the retaining wall and is fixed to the foundation block, the ground anchor that penetrates the embankment layer and is fixed to the ground, and the binding material that is fixed to the counter block for slopes It is fixed and the retaining wall is joined to the counter block for slopes by a connecting material for fixing.
In addition, the embankment structure is constructed by building a retaining wall by stacking precast concrete panels on the foundation block at the bottom of the slope ground, and placing the banking material in multiple stages between the retaining wall and the slope ground. A step of constructing a stacked embankment layer, a step of constructing a slope counter block on the slope ground above the embankment layer, and installing a PC floor plate over the top surface of the slope counter block, the embankment layer and the retaining wall And a tension material penetrating the retaining wall from the PC floor plate and fixing to the foundation block, a ground anchor penetrating the embankment layer from the PC floor plate and fixing to the ground, and fixing from the PC floor plate to the slope counter block It is characterized by comprising a step of fixing and fixing the binding material with a predetermined tension force, and a step of joining the retaining wall to the slope counter block with a fixing connecting material. .

  The front part of the PC floor plate, the retaining wall and the foundation block are connected with a tensile material, the rear part of the PC floor plate is fixed to the slope counter block with a binding material, and the retaining wall and the slope counter block are joined with a fixing connecting material. As a result, the PC floor plate, the retaining wall, the foundation block, and the slope counter block are integrated and fixed to the ground with a ground anchor, so that they can withstand even a large earthquake without collapsing. Further, it is possible to form an outer shell body in which the PC floor board, the retaining wall, the foundation block, and the slope counter block are integrated. Moreover, since the embankment layer is protected as an outer shell body, the embankment layer is not destroyed by a large earthquake. Moreover, the embankment structure as a whole can be fixed to the ground with a ground anchor. Moreover, the PC floor board can be installed reliably and quickly over the upper surfaces of the counter block for slope, the embankment layer and the retaining wall.

  Hereinafter, embodiments of the embankment structure and its construction method according to the present invention will be described with reference to the drawings. First, the embankment structure will be described, and then embodiments of the method for constructing the embankment structure will be described. In each embodiment, the same components will be described with the same reference numerals.

  As shown in FIGS. 1 and 2, the embankment structure 1 includes a retaining wall 5 in which a precast concrete panel (hereinafter referred to as a PC panel) 4 is stacked on a foundation block 3 in a lower part of a slope ground 2, and the retaining wall 5. The slope layer 7 is formed by laminating the banking material 6 in a multi-stage shape between the slope and the slope ground 2, the slope counter block 8 formed on the slope ground 2 on the top of the bank 7, and the slope It is comprised from the counter block 8, the embankment layer 7, and the PC floor board 9 installed over the upper surface of the retaining wall 5. As shown in FIG.

  A foundation block 3 is formed of cast-in-place concrete or precast concrete below the slope ground 2 and supported by a small-diameter steel pipe pile 10. An anchor body 51 is formed below the small-diameter steel pipe pile 10, and a PC steel wire 45 fixed to the anchor body 51 is fixed to the fixing plate 52 of the foundation block with a predetermined tension. A retaining wall 5 made of a PC panel is erected on the foundation block 3, and a tension member 13 to which a predetermined tension is applied is inserted into the through hole 12. The lower end portion of the tension member 13 is joined to the PC steel bar 14 of the foundation block 3, and the upper end portion thereof is fixed to the fixing plate 15 of the PC floor plate, so that the foundation block 3, the retaining wall 5, and the PC floor plate 9 are connected. They are joined together.

  Prestress is applied to the retaining wall 5 for each of the two tension rods 17 connected by the coupling coupler 16, that is, for each of the two-stage PC panels 4. The through hole 12 of the retaining wall is filled with the grout 19 from the injection hole 18 of the tension rod, and the PC panel 4 is integrated.

  As shown in FIG. 3, the tension rod 17 constituting the tension member 13 is a hollow steel pipe made of a high-strength steel material, and female screw portions 20 and 21 are formed at the upper and lower ends, and the upper female screw portion 20 includes A fastening nut 22 is installed, a joint coupler 16 is installed in the lower female thread portion 21, and an injection hole 18 is opened above the joint coupler 16.

  On the other hand, the PC panel 4 constituting the retaining wall 5 has a length of 1 m and a width of 2 m made of lightweight concrete, and has a through hole 12 into which a tension rod is inserted into the reinforcing rib 23 on the back surface. A fixing plate 25 is installed in the upper space 24 of the through hole 12.

  These PC panels 4 are joined up and down by shear pins 26, and as shown in FIG. 4, the fitting projections 28 of the PC panel 4 on the other side are fitted into the semicircular fitting grooves 27 on one side. At the same time, the fitting projection 28 on the other side is fitted into the fitting groove 27 of the PC panel 4 on one side to form the retaining wall 5 and can be rotated around this joint.

  An embankment layer 7 is formed between the retaining wall 5 and the slope ground 2 by laminating the embankment material 6 in a multistage manner with the reinforcing material 29 interposed therebetween. In addition, the embankment material 6 is a variety of mixed soil, which is put into each PC panel 4 to reinforce the mesh geotextile, steel material, rust-proof wire mesh, synthetic resin or fibrous sheet material, mesh body, etc. on its upper surface. A material 29 is laid.

  This reinforcing material 29 increases the tensile resistance of the embankment material 6 by frictional force and adhesion force acting between the embankment material 6 and effectively prevents the occurrence of cracks in the embankment material 6. The shear strength is increased. Also, each embankment material 6 is embedded with two long and short anchor members 30 extending from the reinforcing ribs 23 on the back side of the PC panel. The anchor members 30 are provided on the steel rods 31 connected to the reinforcing ribs 23 and on the tip side thereof. And the support plate 32. A connecting ring 53 is installed on the steel bar 31, and a grounded PC steel wire 54 passes through the connecting ring 53.

  A slope anchor block 8 is constructed of cast-in-place concrete or precast concrete on the slope ground 2 on the upper surface of the embankment layer 7, and a rear portion of the PC floor board is installed on the step-shaped placement portion 33. The rear part of the PC floor board is fixed with a binding material 34 such as a PC steel bar fixed to the slope anchor block 8. The slope anchor block 8 and the retaining wall 5 are joined together by a horizontal fixing connecting member 35. As described above, the tension member 13, the binding member 34, and the fixing connecting member 35 are installed at appropriate intervals along the length direction.

  Therefore, the front part of the PC floor board is joined to the retaining wall 5 and the foundation block 3, and the rear part of the PC floor board is joined to the slope anchor block 8, and the slope anchor block 8 and the retaining wall 5 are connected to the fixing connecting member 35. To form an outer shell 36 in which the PC floor plate 9, the foundation block 3, the retaining wall 5, and the slope anchor block 8 are integrated, and the outer shell 36 surrounds the embankment layer 7 so as to surround it. Yes.

  As shown in FIGS. 5 and 6, the PC floor plate 9 is configured by a PC block 38 having an upright portion 37 erected at the tip thereof joined in a lateral direction with a PC steel wire 39. The PC block 38 is formed by applying a predetermined prestress with a PC steel wire 39 embedded in the length direction, and this PC block 38 is continuously installed on the upper surface of the embankment layer 7 and joined with the PC steel wire 39. The PC floor board 9 is constituted by this, and the top concrete 40 or the asphalt 40 is placed on the upper surface of the PC floor board 9 to construct the roadbed 41. The front part of the PC floor board is joined to the retaining wall 5 and the foundation block 3 by the tension member 13, the rear part is joined to the slope anchor block 8, and the center part is fixed to the ground 11 by the ground anchor 42. The round anchors 42 are also installed at appropriate intervals in the length direction.

  The PC steel wire 54 of the ground anchor 42 is connected to the PC steel wire fixed to the fixing plate 52 of the foundation block 3 by a coupler 56, extends through the embankment layer 7 and extends upward, and is given a predetermined tension. To the PC floor plate 9. Therefore, the embankment structure 1 in which the PC floor plate 9, the foundation block 3, the retaining wall 5, the slope anchor block 8 and the embankment layer 7 are united is integrally joined to the slope ground 2 by the ground anchor 42. Therefore, it does not collapse even in a large earthquake such as a direct type.

  Next, a method for constructing the embankment structure will be described. First, as shown in FIG. 7, the excavation hole 43 is drilled in the ground 11 in the lower part of the slope ground 2. And if the small diameter steel pipe 55 is inserted in this excavation hole 43 and grout 44 is inject | poured, the small diameter steel pipe pile 10 and the anchor body 51 in this lower part will be constructed | assembled. Then, a plurality of PC steel wires 45 are inserted into the grout 44 of the small diameter steel pipe pile 10 and the anchor body 51.

  Next, during the curing period of the grout 44, the foundation block 3 is constructed of cast-in-place concrete or precast concrete. And the upper part of said PC steel wire 45 is inserted in the anchor through-hole 46 of this foundation block 3, the predetermined tension is given, and it fixes to the fixing board 52, and the foundation supported by the small diameter steel pipe pile 10 is carried out. Block 3 is completed. A PC steel wire 54 as a ground anchor is connected to the PC steel wire 45 by a coupler 56.

  Next, the upper portion of the slope ground 2 is cut to form a step portion (step shape) 47 for the slope anchor block, and a lock bolt 48 is driven to stabilize the step. And the slope anchor block 8 is formed in this step part 47 with cast-in-place concrete or precast concrete. The upper surface 49 of the slope anchor block has a height that is the same as the upper surface of the PC floor plate 9, and a stepped mounting portion 33 on which the rear portion of the PC floor plate is placed is formed at the front portion.

  Next, the PC steel rod 14 is fixed to the foundation block 3, and the first tension rod 17 is connected to the upper portion thereof with a coupling coupler 16, and another tension rod (second) 17 is connected thereto.

  Next, as shown in FIG. 8, the PC panel 4 is installed on the foundation block 3, and the tension rod 17 is inserted into the through hole 12. Then, the PC panel 4 is joined to the base block 3 with the thread pin 26 and other PC panels 4 are continuously joined also in the lateral direction to form the first-stage PC panel 4. Next, another PC panel 4 is installed on the first-stage PC panel 4 by the same method as described above to form the second-stage PC panel 4. These upper and lower PC panels 4 are also the same shear pins as described above. 26 to join.

  Next, as shown in FIG. 9, when the grout press-fitting hose 50 is connected to the upper end of the tension rod 17 protruding from the through-holes 12 of these PC panels 4 and the grout 19 is press-fitted, this is applied to the tension rod 17. The through hole 12 is filled from the inlet 18. Then, after the grout 19 has hardened, the tightening nut 22 at the upper portion of the tension rod 17 is tightened and fixed to the fixing plate 25, whereby a predetermined tension is applied. As a result, the first-stage and second-stage PC panels 4 to which a predetermined prestress is applied are fixed to the foundation block 3. In addition, when another tension rod 17 is added to the tension rod 17 of the second-stage PC panel, the coupling coupler 16 is screwed into the upper female screw portion 20 into which the tightening nut 22 is screwed. And

  Further, the grout 19 is injected into the through holes 12 after the PC panels 4 are stacked in two stages as described above. However, the grout 19 may be injected into the through holes 12 after the first stage is installed. That is, in addition to injecting the grout 19 into the through hole 12 in two steps and tensioning the tension rod 17, the grout 19 may be injected into the through hole 12 in one step and the tension rod 17 may be tensioned.

  Next, the anchor material 30 is joined to the reinforcing ribs 23 on the back surface of the first-stage and second-stage PC panels and arranged on the slope ground 2 side. Then, a first-stage embankment material 6 is placed between the slope ground 2 and the PC panel 4 up to the upper surface of the first-stage PC panel 4, and a reinforcing material 29 such as a geotextile is laid thereon. The first level embankment material 6 is formed. Next, by the same method, the second-stage PC panels 4 are stacked and the second-stage embankment material 6 is placed.

  Next, the above operations are sequentially repeated to stack the third-stage and fourth-stage PC panels 4, and as shown in FIG. 1, a self-supporting retaining wall 5, a banking layer 7 in which a banking material 6 is stacked, Build up. At this time, the other PC steel wire 54 connected to the PC steel wire 45 by the coupler 56 is lifted, and when the embankment layer 7 is completed, the upper portion projects from the upper surface. Then, after stacking the uppermost PC panel (fourth stage in the drawing) 4, the PC panel 4 and the slope anchor block 8 are joined together by a fixing connecting member 35. As a result, the retaining wall 5 is fixed not only to the foundation block 3 but also to the slope anchor block 8, and can be prevented from tipping forward.

  Next, after the uppermost banking material 6 is introduced to form the banking layer 7 in which the upper surface of the retaining wall 5 and the mounting portion 33 of the anchor block 8 for slopes are flush with each other, When the PC floor plate 9 is installed across the retaining wall 5 and the slope anchor block 8, the upper surface of the PC floor plate 9 becomes the same as the upper surface of the slope anchor block 8.

  Next, a predetermined tension force is applied to the tension member 13 that penetrates the retaining wall 5 from the PC floor plate 9 and is fixed to the foundation block 3 to fix the front portion of the PC floor plate, and the rear portion of the PC floor plate is inclined by the binding material 34. The anchor block 8 is fixed. At this stage, an outer shell body 36 is formed in which the foundation block 3, the retaining wall 5, the PC floor plate 9, and the slope anchor block 8 are integrated. Then, the outer shell body 36 described above is formed by fixing the PC steel wire 54 of the ground anchor penetrating from the PC floor board 9 through the embankment layer 7 to the ground 11 with a predetermined tension and fixing it to the center part of the PC floor board. Is installed so as to surround the embankment layer 7.

  Next, when the top concrete 40 or the asphalt 40 is placed on the PC floor board 9 to form the roadbed 41, the embankment structure 1 as shown in FIGS. 1 and 2 is completed.

It is sectional drawing of a banking structure. It is a section perspective view of a banking structure. (1) is a front view of a tension rod, and (2) is a sectional view thereof. It is a top view of the retaining wall which joined PC panel. It is a perspective view of a PC floor board. (1) And (2) is sectional drawing of a PC floor board. It is sectional drawing of the construction method of a banking structure. It is sectional drawing of the construction method of a banking structure. It is sectional drawing which fills the through-hole of PC panel with grout.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Embankment structure 2 Slope ground 3 Foundation block 4 PC panel 5 Retaining wall 6 Embankment material 7 Embankment layer 8 Slope anchor block 9 PC floor board 10 Small-diameter steel pipe pile 11 Ground 12 Through hole 13 Tensile material 14 PC steel rod 15 Fixation Plate 16 Coupling coupler 17 Tension rod 18 Inlet 19, 44 Grout 20 Upper female thread 21 Lower female thread 22 Tightening nut 23 Reinforcement rib 24 Upper space 25 Fixing plate 26 Shear pin 27 Fitting groove 28 Fitting protrusion DESCRIPTION OF SYMBOLS 29 Reinforcement material 30 Anchor material 31 Steel bar 32 Bearing plate 33 Placement part 34 Tightening material 35 Fixing material 36 Outer shell 37 Upright part 38 PC block 39, 45, 54 PC steel wire 40 Top concrete 41 Roadbed 42 Ground anchor 43 Drilling hole 46 Anchor through-hole 47 Step 48 Rock bolt 49 Upper surface of anchor block for slope 50 Press-fit hose for grout 51 Anchor body 52 Fixing plate 53 Connecting ring 55 Small-diameter steel pipe 56 Coupler

Claims (2)

  A retaining wall formed by stacking precast concrete panels on the foundation block in the lower part of the slope ground, a banking layer formed by laminating a banking material between the retaining wall and the slope ground, It is composed of a counter block for slopes formed on the slope ground in the upper part, and a PC floor plate installed over the upper surface of the counter block for slopes, the embankment layer and the retaining wall, and the PC floor plate penetrates the retaining wall. The retaining material is fixed to the slope counter block with the tension material fixed to the foundation block, the ground anchor fixed to the ground through the embankment layer, and the binding material fixed to the slope counter block. An embankment structure characterized by being joined with a connecting material.   A process of constructing a retaining wall by stacking precast concrete panels on the foundation block in the lower part of the slope ground, and a process of constructing an embankment layer in which a plurality of banking materials are thrown between the retaining wall and the slope ground And a step of constructing a slope counter block on the slope ground in the upper part of the embankment layer, a step of installing a PC floor plate over the top surface of the slope counter block, the embankment layer and the retaining wall, Tensile material that penetrates the wall and is fixed to the foundation block, a ground anchor that penetrates the embankment layer from the PC floor plate and is fixed to the ground, and a binding material that is fixed from the PC floor plate to the counter block for slopes with a predetermined tension. A method for constructing an embankment structure comprising a step of fixing by tension and a step of joining a retaining wall to a counter block for slopes with a connecting member for fixing.

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