JP2007277910A - Block for lightweight fill, lightweight fill structure, and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a block for lightweight fill which can prevent the generation of rupture and a crack in transportation and construction, and the occurrence of lift due to displacement and water pressure, a lightweight fill structure, and its construction method. <P>SOLUTION: In this block 6 for the lightweight fill, the outer surface of a block body for the lightweight fill is equipped with a fitting protrusion 20 and a fitting recessed groove 21; and a geotextile 19 which is embedded inside comprises a tubular body 19a which is embedded in a state of being positioned along the outer surface, and a surface body 19b which is installed over a section between opposed surfaces in the tubular body 19a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lightweight embankment block, a lightweight embankment structure, and a construction method thereof.

As a lightweight embankment structure, for example, the invention of JP-A-2004-11108 is known. This lightweight embankment structure is formed into a hexagonal column by consolidating coal ash, and a through-hole is provided to form a lightweight block body, and the lightweight block bodies are stacked hierarchically to form a honeycomb structure. Is.
JP 2004-11108 A

  However, since the lightweight block body in the above-mentioned lightweight embankment structure is insufficient in strength, there is a problem that breakage and cracks occur during transportation and construction. In addition, there is a problem that the light weight block body is displaced or lifted with respect to water pressure.

  The present invention has been made in view of these problems, and the purpose thereof is a lightweight embankment block and a lightweight embankment capable of preventing the occurrence of breakage and cracks during transportation and construction, and the occurrence of displacement and lifting due to water pressure. It is to provide a structure as well as a construction method thereof.

A light-weight embedding block for solving the above-described problems is characterized in that the outer surface of the light-weight embedding block main body is provided with a fitting protrusion and a fitting groove, respectively, and a geotextile is embedded therein. Further, the geotextile includes a cylinder body embedded along the outer surface and a face body installed across the facing surface in the cylinder body.
The lightweight embankment structure has a retaining wall formed by stacking a plurality of precast concrete panels on a foundation at a lower part of the slope ground, and the lightweight embankment structure according to claim 1 or 2 between the retaining wall and the slope ground. Foundation concrete in which a bank layer is formed by stacking blocks, the lightweight bank blocks are connected by prestressing with a connecting member inserted in a vertical direction, and the lower end of the connecting member is formed on a slope ground It is characterized by being fixed to.
The lightweight embankment structure is constructed by forming a retaining wall in which precast concrete panels are stacked on the foundation in the lower part of the slope ground, and the lightweight bank block according to claim 1 or 2 between the retaining wall and the slope ground. A lightweight embankment block is stacked on the foundation concrete formed on the slope ground, and is connected with a connecting member that is inserted vertically and fixed to the foundation concrete. .

  By embedding the geotextile in the lightweight embedding block body, it is possible to prevent breakage and cracking during transportation and construction of the lightweight embedding block. Further, by providing the outer surface of the lightweight embankment block main body with the fitting protrusions and the fitting grooves, it is possible to prevent the lightweight embankment blocks stacked in the vertical and horizontal directions from being displaced and moved and lifted against water pressure. The embankment layer is formed by stacking light-weight embankment blocks, and the light-weight embankment blocks are stacked on the foundation concrete formed on the slope ground, and connected by a connecting member that is inserted vertically and fixed at the lower end to the foundation concrete. By doing so, construction can be speeded up and a banking structure can be easily constructed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a lightweight embankment block, a lightweight embankment structure, and a lightweight embankment construction method according to the present invention will be described with reference to the drawings. First, an embodiment of the embankment structure will be described, and then an embodiment of a construction method for a lightweight embankment block and a lightweight embankment structure will be described. In each embodiment, the same components are denoted by the same reference numerals. explain.

  As shown in FIGS. 1 and 2, the lightweight 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 3 in a lower portion of a slope ground 2, and the retaining wall 5 5 and the slope ground mountain 2, and is composed of an embankment layer 7 in which light-weight embankment blocks 6 are laminated, and a shear prevention bolt 8 placed on the slope ground mountain 2.

  A foundation 3 formed in the lower part of the slope ground 2 supports the retaining wall 5, is formed of cast-in-place concrete or precast concrete, and is fixed to the ground 11 by fixing members 10 such as anchor bolts 9.

  The base 3 is fixed with a lower end portion of a connecting member 14 by a plate 12 and a nut 13, and the lower end portion is embedded with a hoop line 15 fixed. The connecting member 14 is, for example, a screw-shaped deformed steel bar, inserted into the through-hole 16 of the PC panel 4 stacked on the foundation 3, and tensioned and fixed with a predetermined tension in the uppermost PC panel 4. Yes. The connecting member 14 is made of a high strength steel material such as a PC steel bar, a PC steel wire, a PC steel stranded wire, in addition to a thread-shaped deformed steel bar.

  The PC panel 4 is made of lightweight concrete and has a size of 1 m in length and 2 m in width. Three reinforcing ribs 17 are formed on the back surface, and the connecting member 14 is inserted into the reinforcing rib 17 at the center. A hole 16 is formed. A space 18 for storing the connecting nut is formed in the lower portion of the through hole 16, and a space 18 for storing the plate is formed in the upper portion.

  A fitting protrusion 20 is formed on the upper surface of the PC panel 4 and a fitting groove 21 is formed on the lower surface. The fitting protrusion 20 of the PC panel 4 located on the lower side is fitted in the fitting groove 21. At the same time, the fitting protrusion 20 on the upper surface is fitted into the fitting groove 21 of the PC panel 4 positioned on the upper side, the PC panels 4 are stacked, and the connecting member 14 is inserted into the through hole 16. Is prestressed and connected.

  On the other hand, a semicircular fitting protrusion 22 is formed on one side surface of the PC panel 4, and a semicircular fitting groove 23 is formed on the other side surface. The fitting projection 22 of the PC panel 4 is fitted, and the fitting projection 22 is fitted into the fitting groove 23 of the PC panel 4 located on the left side, and the PC panels 4 are joined in the lateral direction. The joint can be rotated about the center.

  In this way, the plurality of PC panels 4 are joined vertically and horizontally, and prestress is applied by the connecting member 14, thereby forming a self-supporting retaining wall 5. Further, since the PC panels 4 are rotatable at the joints on the side surfaces, a retaining wall along the shape of the natural ground, for example, a curved one can be formed.

  The embankment layer 7 between the slope ground 2 and the retaining wall 5 is configured by stacking lightweight embankment blocks 6 as shown in FIGS. 6 and 7. This light-weight embankment block 6 is formed in a rectangular parallelepiped shape by aerated mixed concrete, and has a mesh-like geotextile 19 embedded therein. The geotextile 19 includes a cylindrical body 19a (formed with a mesh-like geotextile) embedded along the outer surface, and a plurality of facets (plates with a mesh-like geotextile) disposed over opposing surfaces in the cylindrical body 19a. 19b (which is formed in a shape) to reinforce the lightweight embankment block 6.

  Side fitting protrusions 24 are formed on two adjacent side surfaces of the lightweight embankment block 6, and side fitting concave grooves 25 are formed on the other two adjacent side surfaces, and the central portion penetrates in the vertical direction. A through hole 26 is provided. An upper fitting groove 27 is formed on the upper surface of the through hole 26, and a lower fitting projection 28 is formed on the lower surface. The upper fitting of the lightweight embankment block 6 with the lower fitting projection 28 positioned on the lower side. The lower fitting projection 28 of the lightweight embankment block 6 located on the upper side is fitted into the upper fitting concave groove 27 on the upper surface while being fitted into the concave groove 27.

  As shown in FIG. 1, the lightweight embankment blocks 6 stacked above and below are connected to each other with a predetermined prestress applied by a connecting member 14 inserted into the through hole 26, and a lower end portion of the connecting member 14 is While being fixed to the foundation concrete 29, 30, 31 of the slope ground 2, the upper end portion is tension-fixed on the upper surface of the uppermost lightweight embankment block 6 and is covered with a covering layer 47. Similarly to the above, the connecting member 14 is also made of a high-tensile steel material such as a screw-shaped deformed steel bar, a PC steel bar, a PC steel wire, or a PC steel stranded wire.

  Further, as shown in FIG. 2, the light weight embedding block 6 is joined to the light weight embedding block 6 positioned on the front, rear, left and right sides by side side fitting protrusions 24 and side fitting grooves 25. Accordingly, the light-weight embankment blocks 6 are stacked one above the other and pre-stressed by the connecting member 14 to be joined to form the embankment units 33, 34, 35, 36. The embankment units 33, 34, 35 36 are joined to the front, rear, left and right to constitute the embankment layer 7.

  The shear prevention bolt 8 is placed in order to prevent the slope ground 2 from being sheared and falling, and for example, a tie bolt 38 with a double bearing plate is used. This shear prevention bolt 8 is press-fitted into a grout 40 in which a tie bolt 38 is filled in an excavation hole 39 in the slope ground 2, and is fixed by a first bearing plate 41 in the head with a predetermined tension. Yes. A second bearing plate 42 is embedded in the foundation concrete 29, 30, 31, 32 to integrate the slope ground 2 and the embankment layer 7. In addition to the above, the shear prevention bolt 8 may be a fixing member such as a lock bolt or a permanent anchor.

  Next, the construction method of a lightweight embankment structure is demonstrated. First, as shown in FIG. 8 (1), after drilling holes 39 at appropriate intervals in the slope ground 2, the grout 40 is filled with the grout holes 39, and double support is provided in the grout 40. Insert a tie bolt 38 with a pressure plate. After the grout 40 is cured, the tie bolt 38 is tensioned with a predetermined tension force and fixed to the first pressure plate 41 in the head.

  Next, as shown in FIG. 3, the buried hole 43 is drilled in the ground 11 in the slope ground 2 of the planned embankment, and after the grout 44 is injected into the buried hole 43, the anchor bolt 9 is press-fitted. Then, during the curing period of the grout 44, the foundation 3 is constructed with on-site concrete or precast concrete.

  Next, the anchor bolt 9 is inserted into the anchor through hole 45 of the foundation 3, and the anchor bolt 9 is tensioned to fix the foundation 3 to the ground 11. Moreover, while inserting the lower end part of the connection member 14 in the connection member insertion hole 46 of the foundation 3, the one part is protruded upwards.

  Next, as shown in FIG. 8 (2), another connecting member 14 is connected to a part of the connecting member 14 projecting from the foundation 3 so as to be able to penetrate the through hole 16 of the PC panel 4. . And after this connecting member 14 is inserted into the through hole 16 of the PC panel 4 and the PC panel 4 is installed on the foundation 3, the connecting member 14 is tension-fixed to fix the PC panel 4 on the foundation 3. A first-stage PC panel 4a that is sequentially and repeatedly joined in the horizontal direction is formed.

  Next, the first foundation concrete 29 is constructed by placing concrete between the first-stage PC panel 4 a and the slope ground 2. In the foundation concrete 29, the head of the tie bolt 38 with a double bearing plate, in particular, the two bearing plates 41 and 42 are embedded and integrated with the slope ground 2.

  Next, other PC panels are stacked on the first-stage PC panel 4a in the same manner as described above to form the second-stage PC panel 4b, and the first and second embankments on the first foundation concrete 29. The lower end of the unit connecting member 14 is fixed, and a part of the connecting member 14 protrudes upward. And this connection member 14 is inserted in the through-hole 26 of the block for lightweight embankment, and these are joined to the front and back, right and left by the side part fitting protrusion 24 and the side part fitting concave groove 25, and the 1st and 2nd embankment. The first stage of the units 33 and 34 is formed.

  Then, after the second stage of the third stage PC panel 4c and the first and second banking units 33 and 34 is formed by the same operation as described above, the second foundation concrete 30 is constructed. In the foundation concrete 30, the head of the tie bolt 38 with a double bearing plate is embedded in the same manner as described above, and is integrated with the slope ground 2.

  Next, in the same manner as described above, the fourth stage PC panel 4d, the third stage of the first and second banking units 33 and 34, and the first stage of the third banking unit 35 (of the second foundation concrete 30). And the third foundation concrete 31 is constructed.

  By sequentially repeating such operations, as shown in FIG. 1, the fifth stage PC panel 4e, the fourth stage of the first and second banking units 33 and 34, and the second stage of the third banking unit 35 are provided. The first stage of the fourth embankment unit 36 (on the third foundation concrete 31) is formed.

  Next, the sixth stage PC panel 4f, the fifth stage of the first and second banking units 33, 34, the third stage of the third banking unit 35, and the second stage of the fourth banking unit 36 are formed. At the same time, the fourth foundation concrete 32 is constructed.

  Next, when the connecting member 14 is tensioned and fixed with a predetermined tension force between the upper surface of the uppermost PC panel 4f and the upper surface of the uppermost light-weight embedding block 6, the self-supporting retaining wall 5 and the first ~ Filling layer 7 composed of fourth embankment units 33, 34, 35, 36 is formed.

  And finally, the lightweight embankment structure 1 is constructed | assembled by forming the coating layer 47 on the upper surface of the 4th foundation concrete 32 and the embankment layer 7. FIG. Since this lightweight embankment structure 1 can be easily constructed, it is applied when the road is expanded by cutting the natural slope 2.

  In this road expansion method, first, as shown in FIG. 9, the first light-weight embankment structure 1a is constructed on the lower side of the existing road 48 on the natural slope 2 by the above method. Next, while using the first embankment structure 1a as the temporary road 49, the slope ground 2 of the existing road 48 is shaved, and the second lightweight embankment structure 1b is constructed there.

  Next, when the second lightweight embankment structure 1b is used as the temporary road 49, as shown in FIG. 10, the third lightweight embankment structure 1c is constructed on the first lightweight embankment structure 1b. The road 50 that is greatly expanded from the existing road 48 can be constructed without stopping the vehicle.

It is a longitudinal cross-sectional view of a lightweight banking structure. It is a cross-sectional view of a lightweight embankment structure. It is sectional drawing of the foundation of a lightweight embankment structure. It is a front view of a PC panel. (1) is sectional drawing of a PC panel, (2) is sectional drawing of the junction part. It is a lightweight embankment block, (1) is a perspective view, (2) is a plan view, and (3) is a cross-sectional view along the line AA. It is a perspective view of the lightweight embankment block joined up and down. The construction method of a lightweight embankment structure is shown, (1) is sectional drawing which laid the shear prevention bolt in the slope ground, (2) is sectional drawing which constructs a lightweight embankment structure. (1) to (3) are road expansion methods to which lightweight embankment structures are applied. It is sectional drawing of an expansion road.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lightweight embankment structure 2 Slope ground 3 Foundation 4 PC panel 5 Retaining wall 6 Lightweight embankment block 7 Embankment layer 8 Shear prevention bolt 9 Anchor bolt 10 Fixing member 11 Ground 12 Plate 13 Nut 14 Connecting member 15 Hoop muscle 16, 26 Through hole 17 Reinforcement rib 18 Space 19 Geotextile 20, 22 Fitting protrusion 21, 23 Fitting groove 24 Side fitting protrusion 25 Side fitting groove 27 Upper fitting groove 28 Lower fitting protrusion 29, 30, 31, 32 Foundation concrete 33, 34, 35, 36 Embankment unit 38 Tie bolt 39 Excavation hole 40, 44 Grout 41, 42 Bearing plate 43 Buried hole 46 Connecting member insertion hole 47 Cover layer 48, 49, 50 Road

Claims (4)

  A lightweight embankment block characterized in that a mating protrusion and a mating groove are provided on the outer surface of the light-weight embedding block body, and a geotextile is embedded inside.   2. The lightweight embankment block according to claim 1, wherein the geotextile includes a cylindrical body embedded along the outer surface, and a face body installed across the opposing surfaces of the cylindrical body.   The embankment layer in which a plurality of precast concrete panels are stacked on the foundation in the lower part of the slope ground to form a retaining wall, and the lightweight embankment block according to claim 1 or 2 is stacked between the retaining wall and the slope ground. The lightweight embankment block is pre-stressed and connected by a connecting member inserted in a vertical direction, and the lower end of the connecting member is fixed to the foundation concrete formed on the slope ground. A lightweight embankment structure.   A retaining wall is formed by stacking precast concrete panels on the foundation at the lower part of the slope ground, and a lightweight embankment layer is formed by stacking the lightweight embankment blocks according to claim 1 or 2 between the retaining wall and the slope ground. A method for constructing a lightweight embankment structure characterized in that the embankment blocks are stacked on foundation concrete formed on a slope ground, and are inserted in a vertical direction and connected by a connecting member fixed to the foundation concrete at the lower end.

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