JP5683286B2 - Embankment structure and construction method thereof - Google Patents

Description

  The present invention relates to an embankment structure in which a retaining wall formed by stacking wall panels is prevented from being deformed by the influence of earth pressure of an embankment material, and a construction method thereof.

Conventionally, the following method is known as a construction method of this type of embankment structure. This construction method is based on the following procedure (see FIG. 8).
(A) A step of placing the foundation block 1 on the front ground of the planned embankment and fixing the lower end of the connecting member 2 to the foundation block 1,
(B) Using the wall surface panel 3 having a through-hole in the vertical direction, passing the through-hole through the connecting member 2, and then tightening at the upper portion of the wall surface panel 3,
(C) A step of placing the shear prevention bolt 7 on the slope S on the slope ground is performed,
(D) Between the wall panel 3 and the slope ground, a fluidized embankment material 4b having a specific gravity of 1 or less by mixing coal ash or incinerated ash, a consolidated material, a foaming agent and water is filled and fluidized. Performing the process of laying the crack prevention material 6 on the surface of the embankment material 4b;
(E) The steps (B) to (D) are sequentially repeated until the predetermined height of the embankment structure A is reached (see Patent Document 1).

  The construction method of the embankment structure of such a procedure can contribute to the prevention of destruction of the natural environment by reducing the amount of soil excavation in the mountainous area and using coal ash and incineration ash as embankment materials. it can.

JP 2002-242186 A

  In the conventional construction method of the embankment structure, the retaining wall formed by stacking wall panels changes over time under the influence of the earth pressure of the embankment material and protrudes into a bulging state. Have.

  Therefore, in the conventional example, it must be solved to provide a banking structure in which the retaining wall formed by the wall panel is not deformed by the influence of the earth pressure of the banking material and a method for constructing the banking structure. Has a problem.

  The gist of the present invention for solving the problems of the conventional example is that a retaining wall in which a plurality of precast concrete panels are stacked is formed on a foundation in a lower part of a slope ground, and a bubble is formed between the retaining wall and the slope. A light-weight embankment portion made of a mixed material is formed to a required height, and shear-proof bolts are placed at appropriate intervals on the slope on which the light-weight embankment portion is formed. Is formed, a reinforcing material is embedded at every predetermined interval, and between the reinforcing embankment and the retaining wall is filled with crushed stone, gravel or sand, The reinforcing embankment is provided with an anchor material extending from the retaining wall.

In addition, two bearing plates are installed at a predetermined interval on the head of the shear prevention bolt, and one of the two bearing plates gives tension to the shear prevention bolt. And the other bearing plate is installed at a position protruding from the slope, embedded in the lightweight embankment, and integrally forms the lightweight embankment and the slope ground. ,;
The reinforcing material is a geotextile , a mesh-like or lattice-like steel material, a wire mesh, a synthetic resin or fiber sheet material or mesh material;
The anchor material comprises a PC steel wire and a double plate bearing plate;
Is included.

  Furthermore, the gist of the present invention is that a step of forming a retaining wall with a precast concrete panel on a foundation in a lower part of a slope ground, a step of placing a shear prevention bolt on the slope ground, and a space between the retaining wall and the slope And repeating the steps of placing the foam mixed material on the surface to form a retaining wall having a predetermined height and a lightweight embankment made of the foam mixed material, and then further stacking the precast concrete panels. Forming a retaining wall; laying a reinforcing material at the upper part of the lightweight embankment; installing an anchor material extending toward the slope ground on the retaining wall; The step of charging the embankment material so as to form the step and the step of filling the gaps with crushed stone, gravel or sand as needed are repeated, and the retaining wall and the embankment material having a predetermined height are formed in a multistage shape. Laminated reinforcement It is to form a part.

According to the embankment structure according to the present invention, the earth pressure acting on the retaining wall can be reduced by providing the light-weight embedding portion made of the bubble mixed material. Therefore, it is possible to prevent the problem that the retaining wall changes over time due to the influence of earth pressure and protrudes into a bulging state.
In addition, by providing the reinforcing embankment portion including the reinforcing material and the anchor material, there are various excellent effects that even if the ground sinks, there is no adverse effect such as tilting of the retaining wall.

Two bearing plates are installed on the head of the shear prevention bolt at a predetermined interval, and one of the two bearing plates has a tension force applied to the shear prevention bolt. The other pressure bearing plate is crimped to the slope, installed at a position protruding from the slope, embedded in the lightweight embankment, and integrally formed with the lightweight embankment and the slope ground. The two support pressure plates of the prevention bolt can reinforce the slip soil mass and can be integrated with the lightweight embankment and the slope ground.
That is, in one of the bearing plates, a tension force is applied to the shear prevention bolt and is fixed by the one bearing plate. Therefore, the sliding soil mass can be reinforced to prevent shearing.
Furthermore, since the other bearing plate is installed at a position protruding from the slope and is embedded in the lightweight embankment, the lightweight embankment and the slope ground are integrally formed. That is, there are various excellent effects that the adhesion force between the lightweight embankment and the slope ground can be increased.

Reinforcing materials are geotextiles , mesh-like or lattice-like steel materials, wire meshes, synthetic resin or fiber sheet materials or mesh materials, and the embankment is made by the frictional force or adhesive force acting between the reinforcing material and the embankment material. The tensile resistance of the material is increased, cracks are effectively prevented, and the shear strength of the reinforced embankment is greatly improved.

Since the anchor material is composed of the PC steel wire and the double plate bearing plate, the PC steel wire can follow the settlement of the reinforced embankment, and the inclination of the retaining wall due to the settlement does not occur.
In addition, the stress of the double plate bearing plate acts on both the retaining wall side and the opposite side of the retaining wall, and a stable crimping effect can be expected.
Furthermore, since the anchor material is extended from the retaining wall, there are various excellent effects that the joining between the retaining wall and the reinforcing embankment is good and strong.

Moreover, according to the construction method of the embankment structure which concerns on this invention, since the lightweight embankment part which consists of bubble mixing materials is provided, the earth pressure which acts on a retaining wall can be reduced. Therefore, it is possible to provide a banking structure that prevents the problem that the retaining wall changes with time due to the influence of earth pressure and protrudes into a bulging state.
Moreover, since the reinforced embankment part provided with a reinforcing material and an anchor material is provided, even if the ground sinks, there are various excellent effects that a stable embankment structure can be provided in which adverse effects such as tilting of the retaining wall do not occur.

It is sectional drawing of the embankment structure 11 which concerns on this invention. It is sectional drawing of the lower part of the embankment structure 11 which concerns on this invention. (1) It is a top view of the precast concrete panel 14. FIG. (2) It is a front view of the precast concrete panel 14. FIG. (1) (2) It is sectional drawing of the junction part of the vertical direction of the precast concrete panel 14. FIG. It is sectional drawing of the junction part of the horizontal direction of the precast concrete panel. It is sectional drawing of the slope 16 in which the shear prevention bolt 18 was laid. It is sectional drawing explaining the reinforcement embankment part 20 provided in the back surface of the precast concrete panel 14. FIG. It is sectional drawing for demonstrating the construction method of the embankment structure A which concerns on a prior art example.

  Next, embodiments of the present invention will be described with reference to the drawings. First, in FIG. 1, the code | symbol 11 shows an embankment structure, and this embankment structure 11 is the retaining wall 15 formed by the several foundation 13 in the lower part of the slope natural ground 12, and the some precast concrete panel 14 being stacked, A light-weight embankment portion 17 having a required height formed between the retaining wall 15 and the slope 16, a shear prevention bolt 18 placed on the slope 16, and a bank material 19 on the upper portion of the light-weight embankment portion 17 are formed in a multi-stage shape. Reinforced embankment 20 formed by laminating, reinforcing material 21 embedded in the boundary of reinforced embankment 20, and crushed stone, gravel or sand 22 filled between reinforced embankment 20 and retaining wall 15. And an anchor member 23 extending from the retaining wall 15.

  The concrete foundation 13 formed in the lower part of the slope ground 12 supports the retaining wall 15, is formed of cast-in-place concrete or precast concrete, and has one or two small-diameter support piles 29 or small-diameters. It is fixed to the ground by anchors.

  As shown in FIG. 2, a lower end portion 26 a of a connecting member 26 is fixed to the concrete foundation 13 with a plate 24 and a nut 25, and the lower end portion 26 a is embedded with a hoop bar 27 fixed.

  The connecting member 26 is, for example, a screw-shaped deformed steel bar, is inserted into the through hole 28 of the precast concrete panel 14 stacked on the foundation 13, and is tightened and fixed with a predetermined tension in the uppermost precast concrete panel 14. ing. The connecting member 26 is made of a high-tensile steel material such as a PC steel bar, a PC steel wire, or a PC steel stranded wire, in addition to the thread-shaped deformed steel bar.

  The precast concrete panel 14 is made of lightweight concrete and has a size of about 1 m in length and about 2 m in width. Further, as shown in FIGS. 3 (1) and (2), reinforcing ribs 30 and 30a are formed at three locations on the back surface, and through holes 28 for inserting the connecting members 26 are formed in the central reinforcing rib 30a. Is formed.

  A space 32a for accommodating the connecting nut 31 is formed in the lower part of the through hole 28, and a space 32b for accommodating the plate 33 is formed in the upper part (see FIGS. 3 (2) and 4 (2)). .

  Further, a fitting projection 34 is formed on the upper part of the precast concrete panel 14, and a fitting groove 35 is formed on the lower part. The fitting projection 34 of the precast concrete panel 14 located on the lower side is fitted into the fitting groove 35 and the fitting projection 34 on the upper side is fitted to the precast concrete panel 14 located on the upper side. The precast concrete panels 14 are stacked by being fitted into the concave grooves 35, and these are connected by prestressing by a connecting member 26 inserted into the through hole 28.

  Further, a semicircular fitting protrusion 36 is formed at one end of the precast concrete panel 14 and a semicircular fitting groove 37 is formed at the other end. The fitting projection 36 of the precast concrete panel 14 located on the right side is fitted in the fitting groove 37 and the fitting projection 36 is fitted on the fitting groove 37 of the precast concrete panel 14 located on the left side. The precast concrete panels 14 are joined to each other in the lateral direction by being fitted to each other, and can be rotated around this joined portion (see FIG. 5).

  In this manner, the plurality of precast concrete panels 14 are joined vertically and horizontally and prestressed by the connecting member 26, whereby the self-supporting retaining wall 15 is formed. Further, since the precast concrete panels 14 are rotatable at the joint portions on the side surfaces, a retaining wall along the shape of the natural ground, for example, a curved retaining wall can be formed.

  Further, at the position where the lightweight embankment portion 17 is formed, a reinforcing steel bar 38 is provided on the back surface of the precast concrete panel 14 as shown in FIG. That is, since the reinforcing steel bar 38 extended from the back surface of the precast concrete panel 14 is embedded in the light weight embankment portion 17, the connection between the retaining wall 15 and the light weight embankment portion 17 becomes strong.

  The shear prevention bolts 18 are provided at appropriate intervals on the slope 16 on which the lightweight embankment portion 17 is formed. The shear prevention bolts 18 are press-fitted into the grout 40 filled in the excavation holes 39 of the slope 16 and have a predetermined tension. It has been fixed with power. As shown in FIG. 6, two bearing plates 18 a and 18 b are provided at the head of the shear prevention bolt 18 at a predetermined interval.

Of the two bearing plates 18a and 18b, one bearing plate 18a is applied with tension to the shear prevention bolt 18 and fixed by the one bearing plate 18a. Can prevent shearing.
Moreover, since the other bearing plate 18b is installed in the position which protruded from the slope 16, and is embed | buried in the lightweight embankment part 17, the lightweight embankment part 17 and the slope ground mountain 12 are formed integrally. That is, the adhesion force between the light weight embankment 17 and the slope ground 12 can be increased.

  The lightweight embankment 17 is formed by placing a bubble mixing material 17a between the retaining wall 15 and the slope 16 at a required height. The bubble mixed material 17a is specifically air milk or air mortar, and is made by mixing foamed bubbles, so that it is lightweight and fluid. Therefore, the earth pressure acting on the retaining wall 15 can be reduced. In addition, about the height of the full length height of the embankment structure 11, about 1/3 to about 1/2 of the height which forms the lightweight embankment part 17 is desirable.

  On the upper part of the lightweight embankment 17, a reinforced embankment 20 is formed in which embankment materials 19 are stacked in multiple stages. The embankment material 19 is soil of various soils and mixed soil, and is reinforced embankment in which the embankment material 19 is laminated by inserting a reinforcement material 21 between the retaining wall 15 and the slope ground 12. Part 20 is formed.

  This embankment material 19 is thrown into each stage of the precast concrete panel 14 and laminated by covering the upper surface and the front surface of the embankment material 19 with the reinforcing material 21, and the anchor material 23 from the precast concrete panel 14 is provided for each stage. It is buried (see FIG. 7). In this way, the reinforced embankment portion 20 is formed by laminating the embankment material 19 whose upper surface and front surface are covered with a reinforcing material 21 such as a geotextile.

In addition to the above-described mesh-like geotextile, the reinforcement material 21 includes, for example , a mesh-like or lattice-like steel material, a rust-proof wire mesh, a synthetic resin, a fibrous sheet material or a mesh material, and the reinforcement material 21 and the embankment material 19. The tensile force of the embankment material 19 is increased by the frictional force or the adhesive force acting between them, and the occurrence of cracks in the embankment material 19 is effectively prevented, and the shear strength of the reinforced embankment portion 20 as a whole is greatly improved. . Further, the reinforcing member 21 can be fixed to the back surface of the precast concrete panel 14.

  As shown in FIGS. 1 and 7, the anchor member 23 is composed of a PC steel wire 42 and a double plate bearing plate 43. Since the PC steel wire 42 can follow the settlement of the reinforced embankment 20, the retaining wall 15 is not inclined due to the settlement. Moreover, since the stress acts on both the retaining wall 15 side and the opposite side of the retaining wall 15, the double plate bearing plate 43 can be expected to have a stable crimping effect. Furthermore, since the anchor material 23 extends from the retaining wall 15, that is, from the back surface of the precast concrete panel 14, the joining of the retaining wall 15 and the reinforcing embankment portion 20 is good and strong.

  Further, the embankment material 19 is appropriately inserted with a gap 44 between the back surface of the precast concrete panel 14, that is, between the front surface covered with the reinforcing material 21, and the crushed stone, gravel or sand 22 is appropriately inserted into the gap portion 44. Is filled. In other words, the embankment material 19 is not thrown into the position in contact with the back surface of the precast concrete panel 14, but is thrown up to a position where an appropriate gap 44 is formed to throw in the crushed stone, gravel or sand 22. 22 is in contact with the back surface of the precast concrete panel 14. The crushed stone, gravel or sand 22 has an effect of improving drainage.

  Since the embankment structure 11 comprised as mentioned above provided the lightweight embankment part 17 which consists of bubble mixing material 17a, the earth pressure which acts on the retaining wall 15 can be reduced. Accordingly, it is possible to prevent the problem that the retaining wall 15 changes with time due to the influence of earth pressure and protrudes into a bulging state. Moreover, since the reinforcement embankment part 20 provided with the reinforcing material 21 and the anchor material 23 is provided, even if the ground sinks, there is no adverse effect such as tilting of the retaining wall 15.

  Next, the construction method of the embankment structure 11 will be described. First, a buried hole 45 is drilled in the lower part of the slope ground 12 of the planned embankment, and after grout is injected into the buried hole 45, a small-diameter support pile 29 or a small-diameter anchor is press-fitted. And during the curing period of the grout, the foundation 13 is constructed with cast-in-place concrete or precast concrete, and the head of the small-diameter support pile 29 is projected into the hole 46 of the foundation 13, and then this is tensioned and fixed. And fixed to the base 13 (see FIG. 2).

  Then, another connecting member 26 is connected to a part of the connecting member 26 protruding from the foundation 13 so that the connecting member 26 has a length that can penetrate the through hole 28 of the precast concrete panel 14. After inserting the through hole 28 of the precast concrete panel 14 into the connecting member 26 and installing the precast concrete panel 14 on the foundation 13, the connecting member 26 is tensioned and fixed to fix the precast concrete panel 14 on the foundation 13. This procedure is sequentially repeated to form the first-stage precast concrete panel 14 (retaining wall 15) continuously joined in the lateral direction.

  Reinforcing bars 38 are joined to the reinforcing ribs 30a on the back surface of the first-stage precast concrete panel 14 and arranged on the slope ground 12 side.

  Thereafter, a shear prevention bolt 18 is placed on the slope ground 12. First, excavation holes 39 are drilled in the slope ground 12 at appropriate intervals, and the grout 40 such as mortar is filled in the excavation holes 39. Then, the shear prevention bolt 18 is press-fitted into the grout 40 and the head is projected from the opening of the excavation hole 39. The protruding head is tensioned with a predetermined force after the grout 40 is cured, and is crimped to the inclined surface 16 by one supporting plate 18a, and the other supporting plate 18b is installed at a position away from the inclined surface 16.

  Then, a bubble mixed material 17 a is placed between the precast concrete panel 14 (retaining wall 15) and the slope 16 to the top of the precast concrete panel 14.

  By repeating the operations of installing the precast concrete panel 14, placing the reinforcing reinforcing bars 38, placing the shear prevention bolts 18, and placing the bubble mixed material 17 a as described above, the intermediate-height retaining wall 15 and the bubbles are placed. A lightweight embankment portion 17 made of the mixed material 17a is formed.

  Next, formation of the reinforcement embankment part 20 provided in the upper part of the lightweight embankment part 17 is demonstrated. First, the next-stage precast concrete panel 14 is stacked on top of the precast concrete panel 14 in the same manner as the above-described precast concrete panel 14 installation procedure, and then the reinforcing material 21 is laid on the lightweight embankment portion 17.

  As described above, the reinforcing material 21 is a geotextile or the like, and the reinforcing material 21 can be fixed to the back surface of the precast concrete panel 14.

  And the anchor material 23 is installed in the back surface of the precast concrete panel 14. FIG. The anchor material 23 is composed of the PC steel wire 42 and the double plate bearing plate 43 as described above.

  Between the precast concrete panel 14 (retaining wall 15) and the slope 16, the embankment material 19 is thrown from the retaining wall 15 so as to appropriately form a gap 44, and the embedding material 19 is placed on the top of the precast concrete panel 14 To hit. Further, the gap 44 is appropriately filled with crushed stone, gravel or sand 22.

  By repeating the operations of installing the precast concrete panel 14, laying the reinforcing material 21, installing the anchor material 23, inserting the embankment material 19, and filling the crushed stone, gravel or sand 22, a predetermined height is obtained. The reinforced embankment part 20 which laminated | stacked the retaining wall 15 and the embankment material 19 in multistage shape can be formed, and the embankment structure 11 provided with the self-supporting retaining wall 15 is constructed | assembled.

A embankment structure C asphalt roadbed R retaining wall S slope 1 foundation block 2 connecting member 3 wall panel 4 embankment material 4b fluidized embankment material 5 anchor member 6 crack prevention material 7 shear bolt 7a shear bolt head 8 reinforcement material 11 embankment Structure 12 Slope ground 13 Base 14 Precast concrete panel 15 Retaining wall 16 Slope 17 Lightweight embankment 17a Air bubble mixture 18 Shear prevention bolt 18a, 18b Bearing plate 19 Embankment 20 Reinforced embankment 21 Reinforcement 22 Crushed stone, gravel or sand 23 Anchor material 24 Plate 25 Nut 26 Connecting member 26a Lower end 27 Hoop muscle 28 Through hole 29 Small-diameter support pile 30, 30a Reinforcement rib 31 Connecting nut 32a, 32b Space 33 Plate 34 Fitting projection 35 Fitting groove 36 Fitting Protrusion 37 Fitting groove 38 Reinforcement Muscle 39 borehole 40 grout 41 sliding clod 42 PC steel wire 43 double plate Bearing plate 44 appropriately gap 45 burying holes 46 holes

Claims (5)

A retaining wall is formed by stacking multiple precast concrete panels on the foundation at the bottom of the slope ground,
Between the retaining wall and the slope, a lightweight embankment made of a bubble mixture is formed at the required height,
On the slope where the lightweight embankment is formed, shear prevention bolts are appropriately placed at intervals,
In the upper part of the lightweight embankment, a reinforced embankment is formed in which embankment material is added,
The reinforcing embankment is embedded with a reinforcing material at predetermined intervals,
Between the reinforcing embankment and the retaining wall, crushed stone, gravel or sand is filled,
The reinforced embankment is provided with an anchor material extending from a retaining wall. On the head of the shear prevention bolt, two bearing plates are installed at a predetermined interval,
Of the two bearing plates, one bearing plate is pressure-bonded to the inclined surface by applying tension to the shear prevention bolt,
The other bearing plate is installed at a position protruding from the slope, embedded in the lightweight embankment, and integrally formed with the lightweight embankment and the slope ground. The embankment structure described. The embankment structure according to claim 1, wherein the reinforcing material is a geotextile , a mesh-like or lattice-like steel material, a wire mesh, a synthetic resin-made or fiber-made sheet material or a mesh material. The embankment structure according to claim 1, wherein the anchor material is composed of a PC steel wire and a double plate bearing plate. Forming a retaining wall with a precast concrete panel on the foundation at the bottom of the slope ground, placing a shear prevention bolt on the slope ground, and placing a bubble mixture between the retaining wall and the slope After repeating each step with the process, forming a retaining wall of a predetermined height and a lightweight embankment made of a bubble mixture,
Next, a step of further stacking the precast concrete panels to form a retaining wall, a step of laying a reinforcing material at the upper part of the lightweight embankment, and an anchor material extending to the slope ground are installed on the retaining wall. A predetermined height is obtained by repeating each of the process, the step of charging the embedding material so as to appropriately form a gap portion from the retaining wall, and the step of filling the gap portion with crushed stone, gravel or sand. A method for constructing an embankment structure, comprising forming a retaining wall and a reinforced embankment part in which embankment materials are laminated in a multistage manner.

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