JPH11241343A - Construction method and structure of widened banking of inclined ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the construction time, and reduce the total cost by fixing a front panel to a concrete foundation formed on a bottom part of an inclined ground in a self-standing manner, filling a plastic foam in a space between the inclined ground and the front panel, and fixing an upper part of the front panel to a floor slab formed thereon. SOLUTION: A concrete foundation 12 is first formed on a bottom part of an inclined ground 11, and a front panel 13 comprising a concrete formed body is fixed onto the concrete foundation 12 in a self-standing manner using an L-shaped metal piece 14. A plastic foam which is a banking material is filled in a space formed between the inclined ground 11 and the front panel 13. A plastic foam block 15 such as a polystyrene foam is preferably used. After the plastic foam block 15 is stacked to the prescribed height and filled, a floor slab 17 is formed on its upper surface, and the floor slab 17 is connected and fixed to an upper part of the front panel 13. A subgrade material is finally placed on the floor slab 17 to achieve the asphalt pavement, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for widening roads and the like using foamed plastic as an embankment material, and more particularly to a method for widening embankment on sloping ground and a structure of widening embankment.

[0002]

2. Description of the Related Art As a method of widening an embankment for roads and the like, a method of using a foamed plastic as an embankment material in order to reduce the weight of an embankment structure and reduce earth pressure is known.

In such an embankment method, particularly a method of widening an embankment on a slope, a front panel made of a concrete panel or the like is installed to protect the front surface of the self-standing surface of the foamed plastic.

Conventionally, as a method of installing the front panel, a method of attaching the front panel to a flange portion of the H-shaped steel which is fixed upright with a metal fitting or the like, and a method of dropping the front panel into the flange of the H-shaped steel which is fixed upright are common. . The H-shaped steel is erected and fixed by driving the H-shaped steel into a front surface of an inclined ground or by fixing an H-shaped steel 103 to a base plate 102 provided on a foundation concrete 101 at the bottom of the inclined ground as shown in FIG. 7, for example.

[0005]

However, the H-shaped steel is indispensable in the above-mentioned conventional wide embankment method.
In addition, there is a problem that the cost is extremely high for both the material and the work because a large construction machine is required for the construction.

[0006] In particular, when an H-section steel is driven into a slope and fixed upright, temporary work such as securing a scaffold for a pile driver is required, and the construction period is prolonged. There were also problems that had an adverse effect.

[0007] In view of the above circumstances, the present invention provides a high cost H
A new method of widening embankment on sloping land that enables the installation of front panels for widening embankment on sloping land without arranging pillars such as mold steel, shortening the construction period and reducing total cost, and solving surrounding environmental problems. And a new widened embankment structure.

[0008]

The configuration of the present invention which has been achieved to achieve the above object is as follows.

[0009] That is, a first aspect of the present invention is a widening embankment on an inclined land constructed by filling with foamed plastic.
(1) Form a concrete foundation at the bottom of the slope, (2)
Fix the front panel to the concrete foundation and make it stand alone, (3)
The space formed between the sloped ground and the front panel is filled with foamed plastic, (4) a floor slab is formed on the top surface of the filled foamed plastic, and (5) the upper part of the front panel is fixed to this floor slab. A method for widening an embankment on a slope characterized by having a process.

The first method of the present invention is further characterized in that the front panel has a multi-stage structure, an intermediate floor is formed near the boundary between the upper and lower front panels, and the upper and lower front panels are formed on the intermediate floor. "Fixing the concrete", "using a concrete molded product as a front panel", "forming a floor slab or an intermediate slab by cast-in-place concrete",
Is also included.

A second aspect of the present invention is that a foamed plastic is filled between a sloped ground and a front panel which is fixed to a concrete foundation at a sloped bottom and is free standing, and a floor slab formed on the foamed plastic has a front panel. The structure of the widening embankment on sloped land, characterized in that

According to the present invention, the front panel for protecting the front surface of the self-standing surface of the foamed plastic as the embankment material is fixed and self-supported directly on the concrete foundation using a metal fitting or the like, and the load applied to the foamed plastic is fixed. By adhering to a floor slab installed for the purpose of dispersing the front panel, the front panel can be installed with sufficient strength without providing an expensive column member such as an H-beam.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a basic structure of a widening embankment on a slope constructed by the method of the present invention.

In the method of the present invention, first, a concrete foundation 12 is formed at the bottom of the slope 11. Such a concrete foundation 12 is provided for the purpose of transmitting the applied load uniformly to the ground surface or the like, and can be constructed using not only cast-in-place concrete but also precast concrete.

Prior to the formation of the concrete foundation 12, in order to secure the strength and levelness of the ground surface, a crushed stone or the like is usually rolled to form the base layer.

Next, a front panel 13 for protecting the front surface of a self-standing surface of a foamed plastic described later is fixed and self-standing on the concrete foundation 12. As the front panel 13, a concrete molded product is preferable in consideration of strength, workability, and the like.

A front panel 13 is placed on a concrete foundation 12.
Various methods are conceivable as a method for fixing the self-supporting member. When a concrete molded product is used as the front panel 13, for example, as shown in FIG. It can be easily performed using the metal fittings 14. That is, an insert can be embedded in a predetermined position of a concrete molded product in advance, and can be fixed to the metal fitting 14 with a bolt using the insert.

Next, the space formed between the sloping ground 11 and the front panel 13 is filled with foamed plastic, which is an embankment material.

As the foamed plastic, an in-situ foamed plastic can be used, but a foamed plastic block 15 as shown in FIG. 1 can be suitably used.
Such a foamed plastic block 15 is excellent in economy, workability, and the like, and can shorten the construction period.

As the foamed plastic block 15,
Those excellent in strength and water resistance are preferable. For example, polystyrene foam, polyethylene foam, polyurethane foam and the like can be used. In particular, polystyrene foam (trade name “Light Fill Block”: Dow Chemical Industries, Ltd.) (Manufactured by K.K.).

The foamed plastic block 15 is prepared by placing a pre-foamed bead in a mold, heating and cooling it to a predetermined density to form the foam into a predetermined density. , A fluid gel is formed by extruding the mixture into a fluid, and this is extruded into the atmosphere and rapidly expanded to form a gel. These can be used alone or in combination as an embankment material. When these are used in combination, it is preferable to dispose them by an extrusion foaming method having a high compressive strength.

When the foamed plastic blocks 15 are stacked and filled using the foamed plastic blocks 15, as shown in FIG.
The backing material 16 such as gravel and crushed stone may be filled in the gap between the backing material 1 and the material. The space around the metal fitting 14 may be filled with in-situ foamed plastic from the side.

Also, if necessary, the work of binding the foamed plastic blocks 15 to each other and the work of attaching the horizontal anchor are performed in parallel.

After the foamed plastic blocks 15 are stacked and filled to a predetermined number of steps and a predetermined height, a floor slab 17 is formed on the upper surface of the foamed plastic blocks 15.

The floor slab 17 is provided for the purpose of dispersing a load, protecting the foamed plastic block 15, leveling the ground, and the like. The floor slab 17 is not limited to cast-in-place concrete but can be constructed using precast concrete.

Next, the floor slab 17 and the upper part of the front panel 13 are connected and fixed. In the example shown in FIG. 1, an L-shaped fitting 14 is used in the same manner as the method of connecting the concrete foundation 12 and the front panel 13. In addition, in order to protect the foamed plastic block 15 from oil or the like, a water-impervious sheet or the like can be laid beforehand on the lower surface of the floor slab 17 as necessary.

Finally, a roadbed material is laid on the floor slab 17 and asphalt pavement is performed to complete the widening work on the sloped land.

According to the method of the present invention, since the upper and lower ends of the front panel 13 are fixed to the floor slab 17 and the foundation 12, respectively, the front panel 13 can be installed with sufficient strength even on a steep slope. Thus, there is no need to provide an expensive column member such as an H-shaped steel.

In the example shown in FIG. 1, the front panels 13 are not stacked, but when the embankment height is high, the front panels can be formed in a multi-stage structure, one example of which is shown in FIGS. 2 and 3. Will be explained. FIG. 2 is a longitudinal sectional view, and FIG. 3 is a perspective view for explaining a method of fixing the intermediate floor slab and the front panel.

First, a concrete foundation 12 is formed at the bottom of the sloping ground 11 in the same manner as in the example of FIG. 1, and the first-stage front panel 13a is fixed on the concrete foundation 12 by using a metal fitting 14, and stands up to a predetermined height. After stacking and filling the foamed plastic blocks 15, the intermediate floor slab 21 a is cast on the upper surface of the foamed plastic blocks 15. At this time, an insert is embedded in a predetermined position of the intermediate floor slab 21a.

The intermediate slab is made of a foamed plastic block 1
5, irregularity correction, fixing of the foamed plastic block 15,
It is provided for the purpose of load distribution and buoyancy countermeasures, etc., and can be constructed using not only cast-in-place concrete but also precast concrete.

Next, the second-stage front panel 13b is set on the first-stage front panel 13a, and
The front panel is connected and fixed to a. For intermediate decks,
Because it is necessary to connect and fix to the upper and lower front panels,
It is necessary to determine these connection methods in consideration of the construction procedure and workability. In this embodiment, the connection is fixed by using three types of metal fittings 22, 23, and 24 as shown in FIG.

More specifically, as shown in FIGS. 2 and 3, a metal fitting 22 is fixed to the insert of the intermediate floor slab 21a with a bolt, and a metal fitting 24 is connected to the metal fitting 22 with a bolt 25. Next, the lower projecting portion of the metal fitting 24 is inserted into a gap between the metal fitting 23 previously attached to the upper part of the front panel 13a and the front panel 13a, and the bolt of the metal fitting 23 is tightened. Next, the front panel 13b of the second stage is installed on the front panel 13a of the first stage, and the upper projecting portion of the bracket 24 is connected to the bracket 23 'previously attached to the lower portion of the front panel 13b and the front panel 13b. Insert it into the gap and tighten the bolts on the bracket 23 '. At this time, even when the intermediate floor slab 21 is not at the predetermined level, these operations can be performed relatively easily. Finally, the inclination of the front panels 13a and 13b is adjusted by adjusting the bolts 25 connecting the metal fittings 22 and 24.

As shown in FIG. 3, by attaching a wide metal fitting to the left and right front panels, the left and right front panels can be connected to each other, and the integration can be further improved. .

Similarly, after the foamed plastic blocks 15 are stacked and filled to a predetermined height, the intermediate floor 21b
The third stage front panel 13c is set on the second stage front panel 13b, and the upper and lower front panels 13b, 13c are connected and fixed to the intermediate floor slab 21b.

Finally, as shown in FIG. 1, the foamed plastic block 15 of the uppermost layer is stacked and filled, and the floor slab 17 and the upper part of the front panel 13c are connected and fixed, and a subgrade is laid on the floor slab 17, By performing asphalt pavement, etc., the widening work on the slope is completed.

As described above, when the front panel has a multi-stage structure, the upper and lower front panels are fixed to the intermediate floor slab formed near the boundary between the upper and lower front panels, so that the entire front panel has sufficient strength. Can be installed at

In the present invention, when the floor slab and the intermediate slab are constructed using cast-in-place concrete or precast concrete, various shapes of metal fittings are used for connecting and fixing these to the front panel. Is not limited to the example described above. The uppermost slab can be connected and fixed to the upper part of the front panel using a metal fitting having a relatively simple shape as shown in FIGS. Further, as for the intermediate floor slab, in addition to using a plurality of types of metal fittings as in the example shown in FIGS. 2 and 3, one type of metal fitting as in the example shown in FIGS. Can also be connected.

FIG. 5 shows an example that can be applied to the case where the intermediate floor slab 21 is constructed of either cast-in-place concrete or precast concrete. An L-shaped metal fitting 51 for connection (see FIG. 5A) used in this example is provided with two long holes 52.

Specifically, as shown in FIG. 5B, after the intermediate floor slab 21 is formed slightly lower than the upper surface level of the lower front panel 13a, one surface of the metal fitting 51 is connected to the upper and lower front panels 13a. , 13b so as to straddle the intermediate floor slab 21 and the upper and lower front panels 13 through two elongated holes 52.
The metal fittings 51 are fixed by bolting the inserts embedded in a and 13b, respectively. At this time, even if the intermediate floor slab 21 is not at the predetermined level, the upper and lower front panels 13a and 13b can be easily fixed with bolts through the elongated holes 52.

FIG. 6 shows an example applicable to the case where the intermediate floor slab 21 is constructed of precast concrete.

Specifically, as shown in FIG. 6 (b), after filling a foamed plastic (not shown) to a predetermined level slightly lower than the upper surface level of the lower front panel 13a,
A predetermined surface of the metal fitting 61 (see FIG. 6 (a)) straddles the upper and lower front panels 13a and 13b and is brought into contact therewith, and is bolted to inserts embedded in the upper and lower front panels 13a and 13b, respectively. The metal fitting 61 is fixed. Finally, the intermediate floor slab 21 is inserted into the U-shaped portion of the metal fitting 61 and similarly bolted, whereby the intermediate floor slab 21 can be connected to the upper and lower front panels 13a and 13b.

In the above-described widening embankment constructed by the method of the present invention, the upper and lower ends of the front panel for protecting the front surface of the self-standing surface of the foamed plastic are both sufficiently strong for a concrete foundation, an intermediate floor slab or a floor slab. To form an integral structure.

[0044]

As described above, according to the present invention,
The following effects are obtained. (1) Since the front panel can be installed with sufficient strength without providing an expensive column member such as an H-shaped steel,
Cost reduction is realized for both timber works. (2) Since there is no need to drive pillars into slopes and erect them, there is no need for temporary work such as securing a scaffold for a pile driver, shortening the construction period and reducing the surrounding environment such as noise and vibration. The adverse effects on water are also eliminated. (3) Even when the front panel has a multi-stage configuration according to the embankment height, it is possible to secure the integrity of the widened embankment structure and to cope with various sites such as steep slopes.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view showing a basic example of a widened embankment structure constructed according to the present invention.

FIG. 2 is an elevational sectional view showing another example of the widened embankment structure constructed according to the present invention.

3 is a partial perspective view for explaining a method of fixing an intermediate floor slab and a front panel in the widened embankment structure of FIG. 2;

FIG. 4 is a view showing a metal fitting used for fixing the intermediate floor slab and the front panel in the widened embankment structure of FIG. 2;

FIG. 5 is a view for explaining another example of a method for fixing the intermediate floor slab and the front panel according to the present invention.

FIG. 6 is a view for explaining another example of a method of fixing the intermediate floor slab and the front panel according to the present invention.

FIG. 7 is a view showing a conventional example of a widening embankment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Slope ground 12 Concrete foundation 13, 13a-13c Front panel 14 Metal fittings 15 Foam plastic block 16 Backing material 17 Floor slab 21, 21a, 21b Intermediate floor slab 22-24 Metal fitting 25 Bolt 51 Metal fitting 52 Slot 61 Metal fitting 101 Concrete foundation 102 Base plate 103 H-shaped steel 104 Foamed plastic 105 Front panel

Claims (5)

[Claims] 1. A widening embankment on an inclined ground constructed by filling a foamed plastic, (1) a concrete foundation is formed on a bottom of the inclined ground, (2) a front panel is fixedly mounted on the concrete foundation, and (3) a concrete foundation is formed. (4) forming a floor slab on the upper surface of the filled foam plastic, and (5) fixing the upper portion of the front panel to the floor slab. A method of widening an embankment on sloped land, characterized by having: 2. The method according to claim 1, wherein the front panel has a multi-stage structure, an intermediate slab is formed near a boundary between the upper and lower front panels, and the upper and lower front panels are fixed to the intermediate slab.
The method of widening the embankment on the slope described in the section. 3. The method according to claim 1, wherein a concrete molded product is used as a front panel. 4. The method according to claim 1, wherein the slab or the intermediate slab is formed from cast-in-place concrete. 5. A foamed plastic is filled between a sloped ground and a front panel which is fixed to a concrete foundation at a sloped bottom, and the front panel is fixed to a floor slab formed on the foamed plastic. The feature is the structure of the widening embankment on the slope.