JP3099040B2 - Embankment culvert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfill embankment culvert when a road is constructed by embankment in a mountain valley or the like.

[0002]

2. Description of the Related Art For example, it is difficult to secure a road construction site only in a flat area such as a plain in a mountainous country and in a place where the land is narrow as in Japan. , And the road will penetrate the mountains across the valleys.

When building a road in such a valley,
As shown in FIG. 3, since the road 1 is constructed through the hillside 3 of the mountain 2, it is necessary to form the embankment 5 in the valley portion 4, but the drainage water flows under the embankment 5. It is necessary to secure a waterway 6, which is a small river, and a road 7 such as a farm road which has existed and is used.

In order to secure the waterway 6 and the road 7, a culvert 8 under the embankment having a width of, for example, 10 m, a height of 5 to 10 m, and a length of 100 to 200 m is constructed as a tunnel, and the culvert 8 under the embankment is conventionally constructed. Are used as the waterway 6 and the road 7. Conventionally, as a construction method of the culvert 8 under the embankment,
For example, arches were constructed from cast-in-place reinforced concrete, but recently the construction period can be shortened and the construction cost can be made relatively inexpensive. The embankment using cement stabilized soil (reinforced soil or artificial soft rock) ring There is a lower culvert.

[0005] As shown in FIG. 4, the underfill embankment culvert 8 squeezes out a mixture of cement and aggregate (soil cement) while sufficiently rolling it into a portion to be an artificial soft rock ring (reinforced soil ring) 9. In addition, general soil (excavation of a tunnel, which is soil generated in the field) 20 is sufficiently rolled into the inside of the artificial soft rock ring 9 while being rolled out, and the soil cement and the general soil 20 are brought to a predetermined height. When the height is raised to (the height of the road surface), the general soil 20 surrounded by the artificial soft rock ring 9 is excavated to construct a tunnel, and the waterway 6 and the road 7 are constructed. In the figure, reference numeral 10 denotes general soil generated locally on the outside of the artificial soft rock ring 9.

After excavating the general earth and sand 20, in the same manner as in the case of constructing a general tunnel, as shown in FIG. 5, a concrete 21 is sprayed on the inner surface of the tunnel, and a secondary lining is formed on the inner surface. The lining concrete 22 is constructed.

[0007]

The culvert 8 under the embankment to be constructed by the above-mentioned method is obtained by first rolling general earth and sand 20 inside the artificial soft rock ring 9 and then digging for tunnel construction. There is waste in construction. Until the construction of the lining concrete 22 for the secondary lining in the tunnel is completed, it cannot be used as a tunnel. It is very inconvenient for the local residents, and at the same time, the construction cost increases because the inside of the tunnel is lining separately.

Further, since the artificial soft rock ring 9 is constructed only of soil cement, the quality, especially the strength, of the artificial soft rock ring 9 is often largely influenced by the mixing condition of the cement and the aggregate, and the strength is stable. It was difficult to secure the artificial soft rock ring 9.

[0009] Furthermore, after the mixture material and general earth and sand are unrolled and compacted, the general earth and sand 20 in the artificial soft rock ring 9 is excavated and penetrated through a tunnel. Construction becomes large-scale.

[0010] An object of the present invention is to eliminate the disadvantages of the prior art, eliminate the need for compacting and excavating general earth and sand inside the tunnel, eliminate the need for large-scale temporary materials and machines, and remove the surface and stabilize the skin. The spraying of concrete on the inner surface of the tunnel and the construction of secondary lining concrete, which are performed for the purpose of securing the property and making up, can be omitted.
An object of the present invention is to provide an embankment under embankment that can increase the shear resistance of the artificial soft rock ring, improve the stability of the embankment as a structural body, and can also be reliable in strength.

[0011]

According to the present invention, in order to achieve the above object, a wall is erected on a portion other than the arched top, a precast (PC) plate is arranged on the top, and a strip is provided outside the wall. The gist of the present invention is to install a reinforcing material, and to roll or pour soil cement outside the wall and the precast (PC) plate to construct an artificial soft rock ring, and to lay general earth and sand outside the ring.

According to the first aspect of the present invention, the compaction and excavation of general earth and sand inside the tunnel is performed by installing a wall and a PC board in advance at a location located on the inner surface of the tunnel constructed under the embankment. Work can be omitted, and spraying of concrete on the inner peripheral surface of the tunnel and construction of secondary lining concrete can be omitted.

By providing the belt-like reinforcing material in the artificial soft rock ring, the shear resistance increases and the stability of the structure increases.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing an embodiment of a submerged culvert according to the present invention, and the same components as those of the conventional example shown in FIG. In the figure, reference numeral 11 denotes a wall made of concrete skin (concrete panel serving as a retaining material) to be installed at a construction site of a tunnel to be constructed in the valley 4 or the like. It is composed of a body 11 and the top is composed of a precast (PC) plate 12.

A strip reinforcing member 13 made of, for example, steel, which is a strip, is provided outside the wall 11, and a mixture of cement and aggregate (soil cement) is provided outside the wall 11 and the precast (PC) plate 12. An artificial soft rock ring (reinforced soil ring) 9 is constructed by rolling or pouring, and general soil 10 generated locally is erected outside the ring.

The wall 11 and the precast (PC) plate 1
2. A method of constructing a tunnel which is a culvert 8 under embankment using soil cement and general earth and sand 10 will be described. Wall 11
A steel strip reinforcing material 13 is disposed outside the steel plate, and a method of rolling or pouring the soil cement into the steel plate using a well-known tail arming method as shown in FIG.
A concrete skin wall 11 is erected on the part other than the top of the arched tunnel. The wall 11 is built over the entire length of the tunnel (for example, 200 m), for example, with a width of, for example, 10 m.

Next, a plurality of strip-like reinforcing members 13 made of, for example, steel, which are strips, are installed horizontally outside the wall body 11 in the vertical direction. This is a tensile reinforcement that is placed in the direction of the strain that is expected to occur on the embankment, and restrains the generation of strain through the frictional force that acts between the soil cement that is cast here and the reinforcement, and reinforces it. The effect is obtained.

Next, the outside of the wall 11 is filled with a mixture of cement and aggregate (soil cement) into a portion to be an artificial soft rock ring (reinforced soil ring) 9, and at the same time, on the outside thereof, general soil 10 generated locally. Serve.

The filling of the soil cement is generally carried out by rolling, but fluidized soil cement can be used. In this case, since the material itself is fluidized at the time of construction, a formwork is necessary, but for this, the embankment with the inner wall body 11 and the outer general earth and sand 10 is used as a formwork, This is done using a pump or a chute, and from the both sides of the tunnel toward the vertex at the same time.

The soil cement to be used is manufactured at a manufacturing plant installed on site, and its characteristics are shown in Table 1 below.

[0021]

[Table 1]

Next, a precast (PC) plate 12 is erected on the arched top of the tunnel following the upper part of the wall 11. The precast (PC) plate 12 is manufactured and processed in a factory in advance, is suspended by a wrecker or the like, and a plurality of precast (PC) plates are sequentially assembled in the length direction of the tunnel.

Then, soil cement is applied to the outside of the precast (PC) plate 12 so as to follow the upper portion of the soil cement finally applied to the outside of the wall 11, thereby constructing the artificial soft rock ring 9. In this way, the culvert 8 under the embankment by the artificial soft rock ring 9 is constructed.

[0024]

As described above, the culvert under the embankment of the present invention is constructed by installing a wall and a PC board in advance at a location located on the inner surface of the tunnel constructed under the embankment, so that the general earth and sand inside the tunnel can be removed. The compaction and excavation work can be omitted, large-scale temporary materials and machines are not required, and concrete spraying on the inner surface of the tunnel and secondary concrete Construction can also be omitted.

When the construction of the tunnel space with the wall and the PC board is completed, the tunnel can be used for a time, and at this time, the traffic stop such as the agricultural road existing in the valley can be released at this time. Traffic suspension period can be shortened.

By embedding a strip-shaped steel reinforcing material as a strip in the artificial soft rock ring, the shear resistance is increased, and the stability of the embankment as a structure is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of an underfill embankment of the present invention.

FIG. 2 is an explanatory diagram of a tail army method used for construction of an underfill embankment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a construction example of an underfill embankment of the present invention.

FIG. 4 is a vertical sectional front view showing a conventional underfill culvert.

FIG. 5 is a vertical sectional front view of a main part of a conventional embankment culvert.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Road 2 ... Mountains 3 ... Hillside 4 ... Valley 5 ... Embankment 6 ... Waterway 7 ... Road 8 ... Culvert under embankment 9 ... Artificial soft rock ring 10 ... General earth and sand 11 ... Wall 12 ... Precast (PC) plate 13 ... Belt Reinforcing material 14 ... Base 20 ... General earth and sand 21 ... Sprayed concrete 22 ... Concrete lining

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-85099 (JP, A) JP-A-9-78584 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/05

Claims (1)

(57) [Claims] 1. A wall body is erected on a part other than the arch-like top part, a precast (PC) plate is arranged on the top part, a belt-like reinforcing material is installed outside the wall body, and the wall body and the precast (PC) are installed. A culvert under embankment characterized by rolling or pouring soil cement into the outside of the board to construct an artificial soft rock ring, and embankment of general earth and sand outside the ring.