JPH11256604A - Burying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burying method excellent in independency of back filling soil and execution efficiency, and capable of effectively using the ground part. SOLUTION: A process of works for constructing a retaining wall 4 in a cut and cover trench 2 for a preceeding buried object and a process of works backfilling hardenable filling 5 to the rear of the retaining wall in the shape of a layer to roll are alternately repeated to bury the preceeding buried object 3. Then, the side of the preceeding buried object 3 is cut and covered to cut and cover a trench 6 for a following buried object, and the following buried object adjacent to the preceeding buried object 3 is constructed and is backfilled with earth and sand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for cutting and burying a buried object such as a tunnel, a culvert box, various large-diameter pipes, etc., and more particularly to an improvement in a burying method for improving the self-sustainability of backfill soil. .

[0002]

2. Description of the Related Art Despite originally wishing to construct a plurality of continuous tunnels in parallel, a single preceding tunnel is constructed and backfilled by an open-cutting method mainly for economical reasons and restrictions on the road occupation area. After a few years, there may be a case where a single tunnel is divided into a plurality of works as a single tunnel, such as a work in which a single trailing tunnel is juxtaposed next to a preceding tunnel by a digging method.

[0003]

The above-mentioned burying method has the following problems.

<A> As the excavation depth increases, the earth pressure in the excavation groove increases, so that it is necessary to design a method for preventing the collapse of the backfill soil with high strength, which increases the construction period and increases the burden of construction costs. .

<B> During the construction of the succeeding tunnel, the ground portion of the preceding tunnel cannot be used to avoid an increase in earth pressure acting on the retaining wall and the like.

<C> When a single tunnel is divided and constructed, partition walls cannot be shared and independent walls are required for each tunnel, which is uneconomical in terms of construction cost.

<D> Each time the tunnel is divided and constructed, it is necessary to support the pier with steel sheet piles or the like.

<E> In order to construct the following tunnel away from the preceding tunnel, it is necessary to secure a wide land for the above ground.

[0009] The present invention has been made in view of the above points, and its object is to provide excellent independence of backfill soil,
An object of the present invention is to provide a buried construction method excellent in workability.

Still another object of the present invention is to provide a burying method capable of effectively utilizing a ground portion.

[0011]

The invention according to claim 1 is
After installing the buried object in the excavated trench, in the embedding method of backfilling with backfill material, a step of constructing a retaining wall in the excavated trench, backfilling the solidified embankment on the back of the retaining wall in layers. The burying method is characterized by integrating the retaining wall and the solidified embankment by repeating the rolling step in a hierarchical manner.

[0012] According to a second aspect of the present invention, after a preceding buried object is installed in a trench that has been cut and buried with a backfill material, the side of the preceding buried object is cut open to be adjacent to the preceding buried object. In the burying method of burying a row buried object, a step of constructing a retaining wall in a trench for an excavated preceding buried object and a step of backfilling the solidified embankment in a layered form on the back surface of the retaining wall and compacting the layer are hierarchical. Repeatedly burying the preceding buried object, digging the side of the preceding buried object to cut a trench for the succeeding buried object, constructing the following buried object adjacent to the preceding buried object, and using earth and sand. This is a burial method characterized by backfilling.

According to a third aspect of the present invention, after a preceding buried object is installed in a trench that has been cut and buried with a backfill material, the side of the preceding buried object is cut open to be adjacent to the preceding buried object. In the burying method of burying a row buried object, a step of constructing a retaining wall in a trench for an excavated preceding buried object and a step of backfilling the solidified embankment in a layered form on the back surface of the retaining wall and compacting the layer are hierarchical. To bury the preceding buried object repeatedly, backfill the front surface of the retaining wall in the trench with earth and sand, cut the general earth and sand on the side of the preceding buried object and cut the trench for the subsequent buried object,
A burying method, characterized in that a subsequent buried object is constructed adjacent to the preceding buried object and backfilled with earth and sand.

According to a fourth aspect of the present invention, there is provided the burying method according to any one of the first to third aspects, wherein the retaining wall is composed of a plurality of blocks. The invention according to claim 5 is the embedding method according to claim 4, wherein a horizontal stay is connected to the back surface of the block body, and the horizontal stay is embedded in the solidified embankment. is there.

According to a sixth aspect of the present invention, in the burying method according to any one of the first to fifth aspects, the solidifying embankment material is a mixture of earth and sand and cement or soil cement. It is a buried method.

[0016]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this example, an example applied to a tunnel construction will be described.

<A> Construction of the preceding tunnel Excavation (Fig. 2) After the steel sheet piles 1 and 1 have been driven into the construction position of the preceding tunnel, which is the preceding buried object, a support 9 between the steel sheet piles 1 and 1 And trench 2 is cut open.

Next, the preceding tunnel 3 having a partition 3a in the trench 2 will be described.
To build. The preceding tunnel 3 is constructed by assembling a plurality of PC versions, or is constructed by casting in place.

Backfilling (FIGS. 3 to 5) In the present invention, backfilling is performed as follows while constructing the retaining wall 4. The retaining wall 4 is a wall functioning as a retaining wall when the subsequent tunnel is opened, and is composed of, for example, a plurality of earth retaining block plates 4a and 4b as shown in FIG.

Each of the earth retaining block plates 4a and 4b is a concrete plate having a convex shape and has a plurality of connecting rods 4c and a connecting hole 4d for accommodating the connecting rods 4c in a horizontal plane. Insert 4c and insert each block 4
a and 4b are connected. By employing a grout joint for connection, the connection work of the earth retaining block plates 4a, 4b can be simplified.

The shapes and connecting means of the earth retaining block plates 4a and 4b are not limited to those shown in the drawings, and may be rectangular or polygonal.

Although it is backfilled on the back side of the retaining wall 4, it is very difficult to counter the earth pressure of the backfill soil only by the connection strength between the connection rod 4c and the connection hole 4d. So Figure 4,
As shown in FIG. 5, a highly self-supporting solidifying embankment 5 is spread on the back surface of the retaining wall 4 in a layered form, and is then compacted.

The backfilling work using the solidifying embankment 5 is performed after the construction of the first-stage retaining wall 4 is completed.
After rolling, the retaining wall work of the second and subsequent steps and the construction of the solidifying embankment 5 are sequentially performed in a hierarchical manner.

The solidifying embankment 5 is not expected to have the same strength as concrete, but reduces the earth pressure in the horizontal direction of the backfill soil itself and reduces the back pressure acting on the back of the retaining wall 4. The purpose of the present invention is to reduce the burden on the connecting portion of the retaining blocks 4a and 4b constituting the retaining wall 4. For example, a material obtained by kneading cement-based cement in soil or soil or soil cement can be used. It is manufactured on-site by using or a product manufactured at another place where a manufacturing facility is arranged is brought into the site and used.

By using the solidifying embankment 5 which exhibits its independence at an early stage and constructing it in a hierarchical manner, the previous floor (lower layer) is consolidated, so that it is possible to construct a steep and high embankment. In addition to becoming solidified embankment 5 and retaining wall 4 on the back of retaining wall 4
Is integrated, and the back earth pressure acting on the retaining wall 4 is extremely small, so that the retaining wall 5 can be designed to be thin.

As shown in FIG. 4, in order to enhance the integration between the retaining wall 4 and the solidifying embankment 5, each retaining block plate 4a, 4
Alternatively, a horizontal stay 4e such as a steel bar may be connected to the back of b, and the horizontal stay 4e may be embedded in the solidifying embankment 5.

The above-mentioned retaining wall work and the backfilling work with the solidifying embankment 5 are buried back up to the ground level while being hierarchically repeated.
The space formed between the retaining wall 4 and the steel sheet pile 1 shown in FIG. 5 is backfilled with general earth and sand.

<B> Construction of the trailing tunnel Excavation work (Fig. 1) After the steel sheet pile 1 is driven into one of the planned locations of the trailing tunnel, which is the trailing buried object, the retaining wall 4 and the steel sheet pile 1 The trench 9 for the following tunnel is cut open while the supporting structure 9 is suspended.
When the trench 6 is cut, the excavation is performed so that the partition 3 a of the preceding tunnel 3 is exposed in the trench 6.

Although the retaining wall 4 is exposed by cutting the trench 6, the back pressure of the retaining wall 4 is backfilled with the solidified embankment 5 and the earth pressure acting on the retaining wall 4 is extremely small as described above. No work to prevent the collapse of the solidified embankment 4 and the solidified embankment 5 is required.

The following tunnel 7 is constructed adjacent to the preceding tunnel 3 by using the partition 3a of the preceding tunnel 3 exposed in the trench 6 (FIG. 6). The subsequent tunnel 7 shares the partition 3a of the preceding tunnel 3.

Backfilling (FIG. 6) After the subsequent tunnel 7 is constructed, it is backfilled with a normal backfill material 8 such as earth removal or general earth and sand.

[0032]

[Embodiment 2] When the following tunnels 7, 7 are adjacent to both sides of the preceding tunnel 3, it is preferable to construct retaining walls 4, 4 on both sides of the solidified embankment 5.

[0033]

Third Embodiment In the first embodiment of the present invention, the case where the entire area of the trench 2 for the preceding tunnel is backfilled with the solidifying embankment 5, but the area near the retaining wall 4 is solidified. And the back may be backfilled with general earth and sand.

[0034]

As described above, the present invention has the following effects. <B> By using a highly self-supporting solidifying embankment as the backfill material, and by repeating the retaining wall work and the backfilling work with the solidifying embankment hierarchically, the earth pressure acting on the retaining wall is significantly reduced. Can be. In particular, it is suitable for burying large buried objects whose earth pressure increases as the excavation depth increases. <B> Even if the trench is cut to bury the subsequent buried object, the solidified embankment, which is the backfill material for the preceding buried object, and the retaining wall are integrated, so the retaining wall exposed inside the trench and the leading wall Eliminating the work to prevent collapse of the backfill material of the buried object is unnecessary, and the construction period can be significantly shortened and the construction cost can be reduced. <C> Since the partition of the preceding buried object can be shared by the following structure, the structure is economical. <D> Since the following structure can be constructed adjacent to the preceding structure, the land area of the plane can be reduced. <E> The front surface of the retaining wall in which the preceding buried object is buried can be economically backfilled with general earth and sand, and the trench excavation for burying the subsequent structure can be smoothly performed. <F> The number of earth retaining works can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view when a trench for a subsequent tunnel is cut and opened.

FIG. 2 is an explanatory view of trench excavation for a preceding tunnel and construction of the preceding tunnel.

FIG. 3 is an explanatory view, partly in section, of a retaining wall.

Fig. 4 Partial cross section of retaining wall

[Fig. 5] Illustration of backfilling

Fig. 6 Explanatory drawing when the following tunnel is completed

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 Steel sheet pile 2 Trench 3 Preceding tunnel 3a Partition wall 4 Retaining wall 4a, 4b Soil block plate 5 Solidification embankment 6 Trench 7 Trailing tunnel 8 Backfill material 9 Shoring

Claims (6)

[Claims] 1. A method of burying an object to be buried in an excavated trench after burying the buried object in the excavated trench, constructing a retaining wall in the excavated trench, and solidifying embankment on a back surface of the retaining wall. A burying method characterized by integrating the retaining wall and the solidifying embankment by repeating the steps of backfilling and compacting in a layered manner hierarchically. 2. A preceding buried object is set in the trench that has been cut and buried with a backfill material, and then the side of the preceding buried object is cut and a subsequent buried object is buried adjacent to the preceding buried object. In the burying method, a step of constructing a retaining wall in a trench for an excavated preceding buried object, and a step of backfilling the solidified embankment in a layered form on the back surface of the retaining wall and compacting the layer in a layered manner are performed hierarchically and repeatedly. Burying, digging the side of the preceding buried object to cut a trench for the following buried object, constructing a subsequent buried object adjacent to the preceding buried object and backfilling with earth and sand Buried method. 3. A preceding buried object is installed in the trench that has been cut and buried with a backfill material, and then the side of the preceding buried object is cut and a subsequent buried object is buried adjacent to the preceding buried object. In the burying method, a step of constructing a retaining wall in a trench for an excavated preceding buried object, and a step of backfilling the solidified embankment in a layered form on the back surface of the retaining wall and compacting the layer in a layered manner are performed hierarchically and repeatedly. Burying the front surface of the retaining wall in the trench with earth and sand, digging the general earth and sand on the side of the preceding buried object to cut a trench for the following buried object, and making the trench adjacent to the preceding buried object A method of burying, characterized by constructing a subsequent buried object and backfilling it with earth and sand. 4. The burying method according to claim 1, wherein the retaining wall comprises a plurality of blocks. 5. The burying method according to claim 4,
A burying method, wherein a horizontal stay is connected to the back of the block body, and the horizontal stay is buried in the solidified embankment. 6. The burying method according to claim 1, wherein the solidifying embankment material is a mixture of earth and sand and cement or soil cement.
Burial method.