JPH03247801A - Method for road construction - Google Patents

Abstract

PURPOSE:To ensure the construction of a road in a weak subsoil by laminating a styrofoam body on a styrofoam plate after the styrofoam plate is laid between L type retaining walls buried in the subsoil, and placing a concrete layer thereon to form a road surface. CONSTITUTION:A road 1 on a weak subsoil 2 is constituted of a sand layer 3, styrofoam 4, styrofoam body 14 and L type retaining walls, etc. The styrofoam plate 4 is so formed that plate pieces 5 with drain holes 4a and L-shaped plate pieces 6 are assembled in the shape of a recession. Drain ditches 4c are arranged to the bottom of the styrofoam plate 4 at a certain interval. After that, the styrofoam plate 4 is buried in the sand layer 3, the L type retaining walls 8 are arranged thereon, the styrofoam body 14 is laminated between them, a reinforced concrete layer 15 and filling 17 are piled up thereon, and it is coated with a concrete 18, etc., to form the road surface 16. According to the constitution, land subsidence of the road surface caused by the gush of underground water can be prevented.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a road construction method on soft ground.

(b) Conventional technology Conventionally, for example, Kanchi blocks or cast-in-place concrete retaining walls have been used to construct roads, and the construction method for this is as shown in Figure 1θ. A road surface C higher than the ground is formed by heaping up the earth, and the sides of the earth mound are sloped, and Kanji blocks d are laid on the slope to prevent the earth mound from collapsing.

Such a road surface C is constructed by applying asphalt f to the top of a mound via a crusher run e.

Another construction method is to install concrete retaining walls on the left and right sides of the soft ground, and to fill up soil between the retaining walls.

Asphalt is then poured on top of the embankment to form a road surface.

(c) Problems to be Solved by the Invention However, the above road construction method has the following drawbacks.

That is, in soft ground, there is a risk that each block will sink due to the weight of the embankment, blocks, retaining walls, etc. due to groundwater gushing out, and cracks will appear in the road surface due to the sinking of each block.

Therefore, in the case of soft ground, machines can be used to compact the embankment, and soil improvement equipment can be used to improve the soft ground.
Efforts are made to prevent each block from sinking.

However, the above-mentioned work using a ground improvement device or the like is extremely time-consuming, and therefore, construction of a road on soft ground requires a large amount of construction time and expense.

An object of the present invention is to provide a road construction method that can solve the above problems.

(D) #J. Means for Solving the Problem In the present invention, a Styrofoam board is buried underground through a sand layer or a crusher run layer, and L-shaped support is placed on the left and right sides of the Styrofoam board. The walls are placed at regular intervals, and Styrofoam is laminated between the left and right L-shaped retaining walls with a crusher run layer for fine adjustment, and the road surface is made up of a reinforced concrete layer on top of the Styrofoam. The present invention provides a road construction method characterized by the following features.

(e) Functions and Effects In the present invention, when constructing a road etc. in soft ground, a concrete retaining wall is placed on the top surface of a polystyrene foam board that is laid in the same ground through a sand layer or a crushed run layer. , Styrofoam bodies are stacked between them, and even if groundwater gushes out, the buoyancy of the Styrofoam plates and the Styrofoam bodies will prevent the retaining wall from sinking.

In addition, the Styrofoam bodies are stacked between concrete retaining walls placed on the left and right sides of the Styrofoam bodies, and the retaining walls can reliably hold the stacked Styrofoam bodies without collapsing.

Furthermore, when stacking the Styrofoam bodies between the concrete retaining walls, a crusher run layer is interposed, and by adjusting the crusher run layer, the Styrofoam bodies can be stacked in a stable state as much as possible.

In particular, according to the present invention, since styrene foam plates and styrene bodies are provided instead of soil, stability on soft ground can be improved without soil improvement, and therefore, stability on soft ground can be improved. It is possible to easily construct roads in

(F) Example An example of the present invention will be explained in detail based on the drawings. In the explanatory diagram of FIG. 1, 1 indicates a road according to the present invention, and the road 1 has a certain height. Moreover, it was constructed on soft ground 2.

Therefore, the method for constructing the road 1 on the soft ground 2 will be explained in detail.

That is, a large number of polystyrene foam plates 4 are laid in the soft ground 2 through a sand layer or crusher run layer 3, and the polystyrene foam plates 4 are placed in a constant state by the sand layer or crusher run layer 3.

As shown in FIGS. 2 to 5, the styrene foam board 4 is composed of a styrofoam board piece 5 and an L-shaped plate piece 6,
Each plate piece 5.6 is assembled to form a substantially concave shape, and
A drain hole 4a is provided on the upper surface of the foamed polystyrene plate piece 5.

Further, as shown in FIGS. 2 to 5, the front, rear, and side portions of the Styrofoam plate piece 5 and the L-shaped plate piece 6 are provided with concavo-convex portions 7 for connection, and each concave-convex portion 7 allows each Machine piece 5
, 6 can be connected in the front-rear and left-right directions.

Furthermore, drain grooves 4c are provided at regular intervals on the lower surface of the foamed polystyrene board 4, and groundwater that gushes out is drained in the left-right direction through the grooves 4C.

In this embodiment, the Styrofoam plate 4 and the lower part of the L-shaped retaining wall 8 are buried in the soft ground 2.

When groundwater gushes out in the soft ground 2, the buoyancy of the Styrofoam plate 4 laid in the soft ground 2 and the drainage treatment by capillary action in the drain hole 4a,
The foamed polystyrene board 4 is stabilized so as not to tilt.

Note that G indicates the level of soft ground 2.

Further, L-shaped retaining walls 8 made of concrete blocks are provided on the left and right sides of the Styrofoam board 4, and in this embodiment, a large number of L-shaped retaining walls 8 are installed along the L-shaped plate pieces 6 of the Styrofoam board 4. Type retaining walls 8 are arranged in parallel, and the retaining walls 8 constitute the side walls of the road 1.

As shown in FIG. 1, the L-shaped retaining wall 8 is made up of a bottom wall 8a and a side wall 8b, and is placed along the left and right sides of the recess 4-1 provided in the foamed polystyrene board 4.

Moreover, connecting steels 9 are attached to the upper and lower parts of the left and right L-shaped retaining walls 8, and the L-shaped retaining walls 8 are fixed by the connecting steels 9.
Prevents outward movement.

The connecting steel 9 uses a band steel 9a or a round FI9b, etc. In the case of the band FI19a, as shown in FIG. The left and right end portions of the steel strip 9a are connected via the steel strip 9a.

In addition, in the case of round steel 9b, as shown in FIG.
The left and right ends of the two are inserted through and connected via the first hole.

Furthermore, reinforcing bars or strips 1112 are arranged at regular intervals on the foamed polystyrene board 4 between the left and right L-shaped retaining walls 8, and a crusher run or concrete layer 13 of a constant thickness is provided thereon. , a connecting rope 9 is arranged in the same layer 13.

In this embodiment, the crusher run or concrete layer 13
The level is adjusted by adjusting the level, and the Styrofoam bodies 14, which will be described later, are stacked in a stable state.In addition, as another example, a crusher run or chestnut stone is laid on the Styrofoam board 4 instead of crusher run or concrete. You can also.

On the Thalassochalan layer or concrete layer 13, a large number of Styrofoam bodies 14 having drain holes 14a are installed.
are laminated up to the top of the L-shaped retaining wall 8, and the road surface 16 is layered on the same Tyrol body 14 via a reinforced concrete layer 15.
has been established.

Further, as shown in FIGS. 8 and 9, the foamed polystyrene body 14 is formed into a block shape having various wall thicknesses, and has a vertical drain hole 14a on its upper surface and a groove on its lower surface. 14b is provided.

Then, as in the first article, the above-mentioned Styrofoam bodies 14 are stacked between the L-shaped retaining walls 8, and when groundwater springs up, the groundwater is discharged upward and left and right, and the Styrofoam bodies 14 are stacked. I'm trying to stabilize it.

In this embodiment, a mound 17 is piled up on the upper surface of the reinforced concrete layer 15, and the surface of the mound 17 is covered with asphalt, concrete 18, or the like to form a road surface 16.

Note that 19 indicates guardrails provided on the left and right sides of the road surface 16, and 20 indicates the center line of the road surface 16.

In addition, in the present invention, as shown in Fig. 1, the L-shaped retaining wall 8 is buried up to the middle in the soft ground 2, and compared to the conventional road using Kanchi blocks, the left and right sides of the road 1 are Since a space is formed on the side part, the space can be used effectively.

As described above, the embodiments of the present invention have the following effects.

In the present invention, soft ground! In 2, when constructing the road 1 etc., an L-shaped retaining wall 8 is arranged on the upper surface of the polystyrene foam board 4 laid through the sand layer or the Thalassochalan layer 3,
Styrofoam bodies 14 are stacked between them, and even if groundwater gushes out, the buoyancy of the Styrofoam plates 4 and the Styrofoam bodies 14 can prevent the L-shaped retaining wall 8 from sinking.

In addition, L-shaped retaining walls 8 are installed on the left and right sides of the styrofoam board 4.
In between, the polystyrene foam bodies 14 are laminated, and the laminated polystyrene foam bodies 14 can be reliably held by the same type retaining wall 8 without collapsing.

Moreover, when the Styrofoam bodies 14 are stacked between the L-shaped retaining walls 8, the Thalasso-Shallow layer 13 is interposed, and by adjusting the Crusher run layer 13, the Styrofoam bodies 14
4 can be stacked in as stable a state as possible.

Furthermore, a styrofoam plate 4 and a styrofoam body 14
The drain holes 4a and 14a have respective drain holes 4a and 14a, and springing groundwater is absorbed by the capillary action of the drain holes 4a and 14a, and the groundwater is discharged to the outside of the L-shaped retaining wall 8. This makes it possible to prevent the L-shaped retaining wall 8 from falling.

In particular, according to the present invention, since the styrene foam plate 4 and the styrene body 14 are arranged in the soft ground 2, the stability on the soft ground 2 can be improved without improving the soft ground 2. Therefore, the road 1 can be easily constructed on the soft ground 2.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the road construction method according to the present invention;
Figures 6 to 5 are explanatory diagrams of the polystyrene foam board, Figures 6 and 7 are enlarged views showing the connection structure of the L-shaped retaining wall, Figures 8 and 9 are explanatory diagrams of the polystyrene foam body, and Figure 10 is an explanatory diagram of the polystyrene foam body. An explanatory diagram showing a conventional road construction method is shown. In the figure, 1: 2 roads, soft ground 3: sand or talanoshalan layer 4: polystyrene foam board 8: L-shaped retaining wall 13: krasosharan layer 14: styrofoam body

Claims (1)

[Claims] 1. A styrofoam board (4) is buried in the ground through a sand or crusher run layer (3), and
Concrete retaining walls are placed on the left and right sides of the same Styrofoam board (4) at a certain interval, and a foamed polystyrene body ( 14), and a road surface (16) is further constructed by a reinforced concrete layer (15) on the same styrene body (14).