JP2005042320A - Widening fill structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a widening fill structure using a lightweight fill block made of a foamed synthetic resin, which can be constructed, and which enables an upper concrete floor slab to overhang to a valley side with respect to a wall surface of a stacked structure, while preventing an increase in the weight of the upper concrete floor slab to the utmost. <P>SOLUTION: In this widening fill structure, the lightweight fill blocks 2 composed of the foamed synthetic resin are stacked on a slope 1 of ground in a mountainous region etc., and an intermediate concrete floor slab 3 is placed on the stacked blocks 2. The blocks 2 are stacked on the floor slab 3 so that the stacked structure 4 can be formed, and the wall surface of the stacked structure 4 is covered with a wall-surface protecting material 5. The upper concrete floor slab 6 is placed on the stacked structure 4 in such a manner as to overhang sideward from the wall surface of the stacked structure 4, and the floor slab 3 and the floor slab 6 are fastened together by means of a tendon 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a widening embankment structure for widening or creating a road or the like by a laminated structure formed by laminating lightweight embankment blocks made of foamed synthetic resin.
[0002]
[Prior art]
Conventionally, widening embankment methods using lightweight embankment blocks made of foamed synthetic resin have been put into practical use for the purpose of widening or creating roads on sloped surfaces in mountainous areas. The lightweight embankment blocks are placed and laminated, and concrete or the like is placed on the upper surface of the laminated structure to create a road.
[0003]
FIG. 8 shows an example of a conventional widened embankment structure, in which a foundation 90 is laid on a ground having an inclined surface, an H-shaped steel 91 is erected, and a flat PC panel 92 is placed on the H-shaped steel 91. A lightweight embankment block 93 is laminated to a predetermined height between the PC panel 92 and the inclined surface, and then an intermediate concrete floor slab 94 is placed thereon. Further, the lightweight embankment block 93 is laminated to form a laminated structure 95. When the wide concrete embankment structure is used for a road, an asphalt pavement 97 is applied to the upper concrete floor slab 96 and a guardrail 98 is formed. Etc. are provided as appropriate. In such a conventional widened embankment structure, the wall surface of the laminated structure 95 and the side end face of the upper concrete floor slab 96 coincide, and the laminated structure 95 must be enlarged in order to widen the road width. As a result, there is a problem that the construction cost increases.
[0004]
On the other hand, as a road creation method in a mountainous area, there is a construction method in which a road is projected from a wall surface such as a retaining wall to the valley side. In that case, in order to keep the balance of the load of the overhanging part, the foundation is placed on the mountain side of the upper concrete floor slab or firmly fixed to the ground by anchors, and the weight of the mountain side position of the upper concrete floor slab is set to the valley side It is necessary to make it sufficiently heavier than the overhanging portion (see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-2002-356801 [0006]
[Problems to be solved by the invention]
In the conventional widened embankment structure described above, the road can be widened without enlarging the laminated structure 95 itself by projecting the upper concrete floor slab 96 to the valley side from the wall surface of the laminated structure 95. In order to stabilize the balance of the upper concrete floor slab 96, construction work such as placing a large foundation on the mountain side will increase the construction cost, and it is difficult to carry heavy equipment in the mountain area. It is. Further, if the thickness is increased in order to increase the weight of the upper concrete floor slab 96 on the mountain side, the load applied to the laminated structure 95 is increased, and the lightweight embankment block 93 may be distorted or crushed. In addition, the ground in which the lightweight embankment block 93 is used as the embankment material is often soft ground, and if the load of the widened embankment structure itself increases, the ground may sink. Furthermore, if the upper concrete floor slab 96 is too heavy relative to the laminated structure 95, the center of gravity becomes high, and there is a problem that the stability is deteriorated against shaking such as an earthquake or loosening of the ground.
[0007]
The present invention has been made in view of these points, and in a widening embankment structure using a lightweight embankment block made of foamed synthetic resin, the construction is easy and the weight of the upper concrete slab is made as heavy as possible. It aims at providing the means which can project an upper concrete floor slab from the wall surface of a laminated structure to the trough side, without it.
[0008]
[Means for Solving the Problems]
In the widening embankment structure according to the present invention made to solve the above-mentioned problems, a lightweight embankment block made of foamed synthetic resin is laminated on a base, and a horizontal intermediate concrete slab is placed on the laminated lightweight embankment block. A laminated structure in which the light-weight embankment block is further laminated on the intermediate concrete slab, a wall surface protection material covered on a wall surface of the laminated structure, and the laminated structure, It comprises an upper concrete floor slab projecting laterally from the wall surface of the laminated structure, and a tension material for fastening the intermediate concrete floor slab and the upper concrete floor slab. Thereby, the intermediate concrete floor slab and the upper concrete floor slab are integrated with the lightweight embankment block interposed therebetween, and a balance is maintained with respect to the overhanging portion of the upper concrete floor slab, so that a stable widened embankment structure can be formed.
[0009]
Further, the widening embankment structure according to the present invention includes a laminated structure in which a lightweight embedding block made of foamed synthetic resin is laminated on a base concrete, a wall surface protective material covered on the wall surface of the laminated structure, An upper concrete floor slab placed on the laminated structure and projecting laterally from the wall surface, and a tension material for fastening the foundation concrete and the upper concrete floor slab. It is. Accordingly, the foundation concrete and the upper concrete floor slab are integrated with the lightweight embankment block interposed therebetween, and a balance is maintained with respect to the overhanging portion of the upper concrete floor slab, so that a stable widened embankment structure can be formed.
[0010]
Further, the present invention is characterized in that the tension material penetrates the upper concrete floor slab and is fixed on the upper surface thereof so as to be retensionable. As a result, after the construction of the widened embankment structure, when the tension material that fastens the intermediate concrete slab or the foundation concrete and the upper concrete floor slab is loosened due to the settlement of the laminated structure over time, the tension material The loosening can be eliminated by re-tensioning, and the stability of the widened embankment structure can be easily maintained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the widening embankment structure concerning the 1st Embodiment of this invention is demonstrated concretely based on drawing.
As shown in FIG. 1, the present wide embankment structure has a lightweight embankment block 2 made of foamed synthetic resin laminated on a slope 1 of a ground such as a mountainous area, and an intermediate concrete slab on the laminated lightweight embankment block 2. 3, and the lightweight embankment block 2 is further laminated on the intermediate concrete slab 3 to form a laminated structure 4, and a wall surface protective material 5 is covered on the wall surface of the laminated structure 4. On the structure 4, an upper concrete floor slab 6 is placed so as to project sideways from the wall surface of the laminated structure 4, and the intermediate concrete floor slab 3 and the upper concrete floor slab 6 are connected to the tension material 7. It was concluded by. On the upper concrete slab 6, an asphalt pavement 8 and a guard rail 9 are provided to create a road.
[0012]
In addition, although the foundation and the crushed stone are laid in the lower layer of the laminated structure 4 for the purpose of leveling, draining, etc., this is well-known and arbitrary, and detailed description thereof is omitted. Further, the wall surface protective material 5 is fixed to an H-shaped steel 50 erected on the wall surface side of the laminated structure 4, but the H-shaped steel 50 also has an arbitrary configuration. A well-known and arbitrary support structure such as supporting by connecting with an embedded anchor and an anchor belt can be adopted.
[0013]
The lightweight embankment block 2 is a rectangular parallelepiped made of, for example, a foam of synthetic resin such as polystyrene, polyolefin, urethane, and the size thereof is not particularly limited, and various sizes are used depending on the lamination method. The width × depth × height is about 1000 mm × 2000 mm × 500 mm. By using such a lightweight embankment block 2 as a embankment material, the entire wide embankment structure is reduced in weight, and ground subsidence of soft ground can be suppressed. In addition, construction and transportation are easy, and it is particularly effective in mountainous areas.
[0014]
Although not shown in the drawing, a drainage groove may be formed in the lightweight embankment block 2. For example, if appropriate grooves are formed on the upper and lower surfaces and side surfaces of the lightweight embankment block 2 and communicated between the lightweight embankment blocks 2 in which the grooves are laminated, drainage channels such as rainwater are formed in the laminated structure 4. It is preferable because buoyancy can be prevented from occurring in the lightweight embankment block 2 due to flooding or the like. Further, in the laminated structure 4, since the ground reaction force due to the load of the laminated structure 4 or the upper concrete floor slab 6 acts on the lower lightweight embankment block 2, the density of the lower lightweight embankment block 2 is increased and the strength is increased. You may make it raise.
[0015]
The intermediate concrete floor slab 3 is concrete in which a concrete is cast in the horizontal direction in the vicinity of the middle part of the laminated structure 4, corrects unevenness and steps of the lightweight embankment block 2, roads, etc. Therefore, the load applied to the laminated structure 4 is evenly distributed to each lightweight embankment block 2. The lightweight embankment block 2 is further laminated on the intermediate concrete floor slab 3 to form a laminated structure 4 on the slope 1. In the present embodiment, only one layer of the intermediate concrete floor slab 3 is provided. However, if the laminated structure 4 is higher, a plurality of layers are provided for every 4 to 6 layers of the lightweight embankment block 2, for example. Also good. Further, reinforcing bars may be disposed in the intermediate concrete slab 3.
[0016]
The wall surface protective material 5 is a well-known one such as a rectangular panel made of concrete, synthetic resin, or the like, and, instead of the panel, carbon fiber, synthetic resin, fiber reinforced plastic capable of enclosing soil for plant cultivation, If a net-like member such as a non-woven fabric is used as the wall surface protective material 5, the wall surface of the present widened embankment structure can be greened.
[0017]
The upper concrete floor slab 6 is made by placing concrete with a predetermined thickness on the upper surface of the laminated structure 4, and has an overhanging portion 60 protruding from the wall surface of the laminated structure 4 to the valley side. As described above, an asphalt pavement 8 or the like is formed on the upper concrete floor slab 6 to create a road. However, a road wider than the upper surface of the laminated structure 4 can be created by the overhanging portion 60. That is, the width of the laminated structure 4 can be reduced with respect to the road width, and the number of lightweight embankment blocks 2 can be reduced correspondingly, thereby reducing the construction cost. In addition, it is good also as arrange | positioning a reinforcing bar suitably also in the upper concrete floor slab 6. FIG.
[0018]
FIG. 2 shows the tendon material 7. As shown in the figure, the tendon material 7 is a rod-shaped member that fastens the intermediate concrete floor slab 3 and the upper concrete floor slab 6 by connecting them in a tension state. A substrate 70 is embedded in the intermediate concrete slab 3, a PC steel rod 71 is connected to the substrate 70, and a fixing plate 72 and a nut 73 are provided at the tip of the PC steel rod 71. is there. The substrate 70 is provided with a support portion 70b for standing a PC steel rod 71 on a flat plate 70a. The flat plate 70a is fixed to the intermediate concrete floor slab 3 by being embedded in the intermediate concrete floor slab 3. The support portion 70b protrudes upward from the intermediate concrete slab 3 so that it can be connected to the PC steel bar 71. The connection between the support portion 70b and the PC steel rod 71 is performed by a known and arbitrary method such as screwing or welding with a screw. The PC steel bar 71 has a length corresponding to the distance from the intermediate concrete floor slab 3 to the upper concrete floor slab 6. A screw portion 71 a is formed at the tip of the PC steel bar 71, and the PC standing on the substrate 70. The threaded portion 71 a of the steel bar 71 reaches the upper concrete floor slab 6. The upper concrete slab 6 is formed with an insertion hole 61 at a position where the PC steel bar 71 is inserted. The insertion hole 61 is a hole through which the PC steel rod 71 can be inserted. The upper side of the insertion hole 61 is enlarged in diameter, and a pressing surface 61 a for pressing downward by the tension member 7 is formed. The fixing plate 72 is provided with an insertion hole (not shown) through which the PC steel rod 71 can be inserted, and the PC steel rod 71 is inserted in the insertion hole 61 as shown in the figure. The press surface 61a is pressed against the pressing surface 61a by the nut 73 screwed into the threaded portion 71a at the tip of the PC steel rod 71.
[0019]
The tension members 7 configured as described above are arranged at predetermined intervals in the extending direction of the widened embankment structure, that is, the road extending direction, and the intermediate concrete floor slab 3 and the upper concrete are formed by the tension members 7. The intermediate concrete floor slab 3 and the upper concrete floor slab 6 are integrated with the floor slab 6 in a state where the lightweight embankment block 2 is sandwiched, and the balance with respect to the overhanging portion 60 of the upper concrete floor slab 6 is maintained. . Therefore, it is not necessary to firmly fix the upper concrete slab 6 to the ground with a foundation, an anchor or the like, and the construction becomes easy. Moreover, since it is not necessary to thicken the mountain side of the upper concrete floor slab 6 for the balance weight, the weight of the upper concrete floor slab 6 can be reduced, thereby reducing the weight of the entire expanded embankment structure and reducing the load on the ground. There is an advantage of becoming.
[0020]
Asphalt pavement 8 is provided on the upper concrete floor slab 6, and a maintenance inspection port 80 communicating with the insertion hole 61 is formed at a position corresponding to the insertion hole 61 of the asphalt pavement 8. . After the construction of this widened embankment structure, the upper concrete floor slab 6 and the laminated structure 4 and the like may be subsidized with time, so-called creep. There is a possibility that the tension material 7 for fastening the thread may loosen. By forming the maintenance inspection port 80 in the asphalt pavement 8, it is possible to visually check whether the looseness has occurred on the road. By inserting a tool into the insertion hole 61 and retightening the nut 73, the tension member 7 can be re-tensioned. The maintenance inspection port 80 is usually covered with a steel plate or the like.
[0021]
In this embodiment, the PC steel rod 71 is used as the tendon 7, but the tendon of the present invention uses a flexible rope such as a wire rope, and the rope is used as the upper concrete slab 6. It is good also as a structure which is tense by inserting in and fixing with a clamp etc. In this way, the tension member 7 is made of a rod-like material such as a PC steel rod or a rope, so that, for example, the intermediate concrete slab 3 and the upper concrete slab 6 are connected to each other by a concrete or H-shaped steel. Since the space occupied on the body 4 is reduced and the lightweight embankment block 2 is easily arranged, and the weight is also light, there is an advantage that the load on the ground is small and the construction is easy.
[0022]
Hereinafter, the construction method of this widening embankment structure is demonstrated.
First, as shown in FIG. 3, a foundation is placed on a part of the slope 1, and an H-shaped steel 50 is erected on the foundation. As described above, the H-shaped steel 50 has an arbitrary configuration and does not need to be provided if the wall surface protection material 5 is supported by another method. The wall protector 5 is sequentially fixed to the H-shaped steel 50, and the light weight embankment block 2 is laminated between the wall protector 5 and the slope 1. Further, crushed stone or the like is laid between the lightweight embankment block 2 and the slope 1 as necessary for drainage or the like. After the light-weight embankment block 2 is laminated in 4 to 6 layers, the intermediate concrete floor slab 3 is placed on the laminated light-weight embankment block 2 with a predetermined thickness, and the tension material 7 is placed on the intermediate concrete floor slab 3. The substrate 70 is embedded so that the support portion 70 b protrudes upward, and is fixed to the intermediate concrete floor slab 3. The position where the substrate 70 is buried is not particularly limited, and the upper concrete floor slab 6 is made of the tension material 7 in consideration of the overhanging portion 60 of the upper concrete floor slab 6, the road width, the shape of the slope 1 and the like. It is set appropriately so that the tension force acts equally, and a plurality of tension members 7 may be provided in the width direction of the intermediate concrete slab 3.
[0023]
After curing for a predetermined period and solidifying the intermediate concrete slab 3, as shown in FIG. 4, a PC steel bar 71 is connected to the substrate 70 and is erected, and a lighter embankment block 2 is further placed on the intermediate concrete slab 3. Are stacked to form the laminated structure 4. At that time, the light weight embedding block 2 arranged on the periphery of the PC steel rod 71 is preferably one having a recessed groove formed in the vertical direction of the side surface so as not to interfere with the PC steel rod 71. A groove formed on the side surface for the drainage channel may be used as the recessed groove.
[0024]
Next, the upper concrete floor slab 6 is placed on the laminated structure 4. At this time, as shown in FIG. 5, a support work 51 is installed on the valley side of the wall surface protective material 5, and the upper concrete floor slab is placed. 6 overhangs 60 are supported. The upper concrete floor slab 6 is formed with an insertion hole 61 for inserting the PC steel rod 71, and the PC steel rod 71 is inserted into the insertion hole 61. At this time, the fixing plate 72 Since the nut 73 is not provided, the balance of the upper concrete slab 6 is unstable due to the overhanging portion 60. Therefore, in order to stabilize the balance of the upper concrete floor slab 6 during the curing period, it is supported by the support work 51.
[0025]
After solidifying the upper concrete floor slab 6 by curing for a predetermined period, as shown in FIG. 2, a PC steel bar 71 is inserted into the fixing plate 72, and a nut is screwed into the PC steel bar 71 and tightened. The fixing plate 72 is brought into pressure contact with the pressing surface 61 a of the insertion hole 60. Accordingly, the intermediate concrete floor slab 3, the upper concrete floor slab 6 and the tension material 7 are tensioned and fastened. Thereafter, the support work 51 is removed, and as shown in FIG. 1, asphalt pavement 8 is applied on the upper concrete floor slab 6, and a road is created by appropriately installing a guardrail 9 and the like.
[0026]
Hereinafter, the widening embankment structure concerning the 2nd Embodiment of this invention is demonstrated concretely based on drawing.
In this widened embankment structure, the upper concrete floor slab 6 is fastened by the foundation concrete 30 and the tension material 7. When the height of the embankment is not so high and the number of stacked light-weight embankment blocks 2 is small, the intermediate concrete floor slab 3 as in the first embodiment may not be provided. The widened embankment structure corresponds to the laminated structure 40 in which no intermediate concrete slab is provided. Specifically, as shown in FIG. 6, a foundation concrete 30 is cast on the slope 1 of the ground such as a mountainous area, and a lightweight embankment block 2 made of foamed synthetic resin is laminated on the foundation concrete 30 to form a laminated structure. 40 is formed, and the wall surface protective material 5 is covered on the wall surface of the laminated structure 40, and the upper concrete floor slab is projected on the laminated structure 40 so as to protrude sideways from the wall surface of the laminated structure 40. 6 is placed, and the foundation concrete 30 and the upper concrete floor slab 6 are fastened by the tension material 7. In the figure, the same reference numerals as those in the first embodiment denote the same members, and the detailed description of the members is omitted in this embodiment.
[0027]
The foundation concrete 30 is formed by excavating a predetermined area of the slope 1 to be embanked and placing the concrete, and the unevenness leveling for stably mounting the lightweight embankment block 2 is performed. In addition, it is provided by a so-called foundation work for evenly distributing the load applied to the laminated structure 40 from a road or the like. Although not shown in detail in the figure, the uppermost layer of the foundation concrete 30 is provided with a thin layer of sand or the like for leveling, and is finished horizontally and flatly. Drainage works using crushed stones and drain pipes. Moreover, it is good also as arrange | positioning a reinforcing bar in the foundation concrete 30. FIG.
[0028]
The tendon material 7 is the same as that described above, and is a rod-like material that fastens the basic concrete 30 and the upper concrete slab 6 by connecting them in a tension state. As shown in FIG. 7, the flat plate 70 a of the substrate 70 is fixed to the foundation concrete 30 by being embedded in the foundation concrete 30, and the support portion 70 b is connected to the PC steel rod 71 from the foundation concrete 30. It protrudes upward. The PC steel bar 71 has a length corresponding to the distance from the foundation concrete 30 to the upper concrete floor slab 6, and the threaded portion 71 a of the PC steel bar 71 reaches the upper concrete floor slab 6. In addition, in the insertion hole 61 of the upper concrete slab 6, the fixing plate 72 and the pressing surface 61 a are pressed against each other by a nut 73 screwed into the screw portion 71 a at the tip of the PC steel bar 71.
[0029]
Thereby, the foundation concrete 30 and the upper concrete floor slab 6 are fastened, and the foundation concrete 30 and the upper concrete floor slab 6 are united in a state where the lightweight embankment block 2 is sandwiched, and the overhanging portion 60 of the upper concrete floor slab 6 is obtained. The balance against is maintained. Therefore, it is not necessary to place a foundation on the mountain side only to fix the upper concrete floor slab 6, and the upper concrete floor slab 6 can be easily fixed using the foundation concrete 30 placed by the foundation work. Can do. Moreover, since it is not necessary to thicken the mountain side of the upper concrete floor slab 6 for the balance weight, the weight of the upper concrete floor slab 6 can be reduced, so that the entire widened embankment structure can be reduced and the load on the ground is reduced. There is an advantage.
[0030]
【The invention's effect】
Thus, according to the widening embankment structure according to the present invention, a lightweight embankment block made of foamed synthetic resin is laminated on the ground, and a horizontal intermediate concrete slab is placed on the laminated lightweight embankment block. A laminated structure in which the light-weight embankment block is further laminated on the intermediate concrete slab, a wall surface protective material covered on a wall surface of the laminated structure, and the laminated structure on the laminated structure Since it comprises an upper concrete floor slab that is projected from the wall surface of the wall and a tension material that fastens the intermediate concrete floor slab and the upper concrete floor slab, a state in which a lightweight embankment block is sandwiched Therefore, the intermediate concrete slab and the upper concrete slab are integrated, and the balance against the overhanging part of the upper concrete slab is maintained, and a stable widened embankment structure can be easily formed. .
[0031]
Further, according to the widening embankment structure according to the present invention, a laminated structure in which a lightweight embankment block made of foamed synthetic resin is laminated on the base concrete, and a wall surface protection material covered on the wall surface of the laminated structure, And an upper concrete floor slab placed over the laminated structure from the wall surface to the side and a tension material for fastening the foundation concrete and the upper concrete floor slab. Therefore, the same effect as described above can be obtained.
[0032]
In addition, since the tension material penetrates the upper concrete floor slab and is fixed to be re-tensionable on the upper surface, the loosening of the tension material can be eliminated after the construction of the widening embankment structure. The stability of the widened embankment structure can be easily maintained.
[Brief description of the drawings]
[Explanation of symbols]
FIG. 1 is a cross-sectional view showing a widening embankment structure according to a first embodiment of the present invention.
FIG. 2 is a partially enlarged view showing the configuration of the tendon material 7;
FIG. 3 is a cross-sectional view for explaining the construction method of the widening embankment structure according to the present embodiment.
FIG. 4 is a cross-sectional view for explaining the construction method of the widening embankment structure according to the present embodiment.
FIG. 5 is a cross-sectional view for explaining a construction method of the widening embankment structure according to the present embodiment.
FIG. 6 is a cross-sectional view showing a widening embankment structure according to a second embodiment of the present invention.
FIG. 7 is a partially enlarged view showing the configuration of the tendon material 7 in the second embodiment.
FIG. 8 is a cross-sectional view showing a conventional wide embankment structure.
[Explanation of symbols]
2 Lightweight embankment block 3 Intermediate concrete floor slab 4 Laminated structure 5 Wall protective material 6 Upper concrete floor slab 7 Tension material 30 Basic concrete 40 Laminated structure 60 Overhang

Claims (3)

A lightweight embankment block made of foamed synthetic resin is laminated on the base, a horizontal intermediate concrete slab is placed on the laminated lightweight embankment block, and the lightweight embankment block is further laminated on the intermediate concrete slab. A laminated structure,
A wall surface protecting material laid on the wall surface of the laminated structure;
On the laminated structure, an upper concrete floor slab that is projected from the wall surface of the laminated structure to the side, and
A widening embankment structure comprising a tension material for fastening the intermediate concrete slab and the upper concrete slab. A laminated structure in which lightweight embankment blocks made of foamed synthetic resin are laminated on base concrete;
A wall surface protecting material laid on the wall surface of the laminated structure;
On the laminated structure, an upper concrete floor slab that is projected from the wall surface of the laminated structure to the side, and
A widening embankment structure comprising a tension material for fastening the foundation concrete and the upper concrete floor slab. 3. The widened embankment structure according to claim 1, wherein the tension material is penetrated through the upper concrete floor slab and fixed on the upper surface so as to be re-tensionable.

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