JP2005179975A - Underground facility construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground facility construction method for efficiently constructing an underground facility. <P>SOLUTION: The underground facility construction method is comprised of a peripheral wall forming step of injecting a hardener into earth etc. E forming the ground to erect a peripheral wall 10; an earth etc. removing step of removing the earth etc. E remaining inside the peripheral wall 10; a bottom slab forming step of arranging a bottom slab 20 inside the peripheral wall 10; a column erecting step of erecting a plurality of columns 30 inside the peripheral wall 10, and a top slab forming step of arranging a top slab 50 over upper edges of the respective columns 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction method for providing an underground facility.

  The background technology of an underground water storage facility, which is an example of an underground facility, will be described.

  There are sewers in cities. When it rains, the rainwater flows through the sewers and rivers and flows into the sea.

By the way, sometimes heavy rain falls that exceeds the capacity of the sewers and rivers. In that case, the rainwater that has lost its place overflows into the city and floods occur. This is remarkable due to a decrease in paddy fields and the like due to rapid urbanization in recent years.
For this reason, a water storage facility (called an underground water storage facility) may be provided underground. The underground water storage facility temporarily stores rainwater during heavy rain, and after the heavy rain has passed, the water is gradually discharged into sewers and rivers.

Conventional construction methods for underground water storage facilities include the following.
The first prior art is as follows.
A large number of pieces that together form the underground water storage facility (the bottom plate, the wall, and the top plate) are manufactured in advance at the factory by reinforced concrete. On the other hand, in the field, a recess (a hole opened upward) is formed in the ground.
And each piece is installed and couple | bonded with respect to the recessed part, and earth and sand are returned on that, or a pavement etc. are carried out after that, and an underground water storage facility (underground facility) is formed.

The second prior art is as follows.
A large number of hollow, substantially cubic blocks made of resin having a large number of holes on each surface are manufactured in a factory. On the other hand, in the field, a recess (a hole opening upward) is formed in the ground, and a waterproof sheet is stretched on the recess. And the above-mentioned many blocks are filled in the concave portion (the inside), and then the earth and sand are returned or paved, thereby forming an underground water storage facility (underground facility). The

However, in the first prior art, each piece of reinforced concrete has a large weight, and operations such as transportation and installation from the factory to the site are complicated. If the size of the piece is reduced, the burden of transportation will be reduced in terms of weight, but the number of pieces will be increased accordingly, which will increase the amount of labor for transportation and increase installation and connection. The burden increases.
As described above, the first prior art is inefficient even if the construction can be performed more efficiently than when concrete is placed on site.

In the second prior art, it is necessary to dispose the block so that not only the portion corresponding to the bottom surface, the wall surface, and the top surface of the recess formed on the ground at the site, but also the entire interior of the recess is filled. Therefore, a large number of blocks are required, and the work such as conveyance becomes very complicated.
Thus, the second prior art is also inefficient.

In the first prior art described above, after forming the recess by removing the earth and sand at the inside of the recess, a piece or the like that forms the wall of the recess is installed.
Also in the second prior art, after forming the recess by removing the earth and sand at the inside of the recess, a waterproof sheet is stretched, and then the interior of the recess is filled with a number of blocks.
In any of the above-described prior arts, when removing the earth and sand to form the recess, the portion that becomes the inner wall surface of the recess is not stable. .

For this reason, in the above-described prior art, in order to prevent the earth and sand from collapsing, it is first necessary to perform earth retaining work which is temporary work. That is, first, the portion that becomes the inner wall surface of the concave portion and the vicinity thereof are excavated to remove the earth and sand of that portion, a plurality of piles are hit, and the plate material is fixed over the plurality of piles to prevent the collapse of the earth and sand. To do.
However, because of the earth retaining work, which is a temporary construction, it takes much time for construction and is not efficient and the cost is high.

  An object of the present invention is to provide a method capable of efficiently providing an underground facility.

  In order to solve this problem, the invention according to claim 1 is an underground facility construction method for providing an underground facility, and forms a peripheral wall portion by injecting a solidifying material into earth and sand forming the ground. A peripheral wall portion forming step, earth and sand removing step for removing earth and sand inside the peripheral wall portion, a bottom plate portion forming step for providing a bottom plate portion inside the peripheral wall portion, and a plurality of columns with respect to the inside of the peripheral wall portion Is a construction method of an underground facility having a column standing step for standing and a top plate forming step for providing a top plate over the upper ends of the plurality of columns.

Examples of “underground facilities” include underground water storage facilities, underground parking lots, underground passages, underground stores with underground passages (so-called underground shopping streets), underground waste disposal plants, and the like.
"Underground water storage facilities" are facilities for storing rainwater, etc. underground, including those that store rainwater, etc. underground, and gradually drain (infiltrate) the rainwater into the surrounding sediments. .

  Further, as a representative example of “injection” of “injecting a solidifying material into the earth and sand forming the ground to form a peripheral wall portion”, there is an aspect involving “stirring of the solidifying material into the earth and sand”.

As a specific method for injecting (stirring) the solidifying material to the earth and sand forming the ground, in addition to the aspect of the invention according to claim 2, a chain is extended over a pair of sprockets positioned above and below. There are various types such as a mode in which a chain is revolved by rotating a sprocket using a machine, and a solidifying material is injected (stirred) into the earth and sand by the chain.
And like the invention concerning Claim 2, it is possible to form a wall part (peripheral wall part) by performing the work in a plurality of points which adjoined.

In the underground facility construction method of the present invention, the underground facility is constructed as follows.
First, in a surrounding wall part formation process, a solidification material is inject | poured with respect to the earth and sands which form a ground, and a surrounding wall part is formed.
Next, in the earth and sand removal step, earth and sand inside the peripheral wall portion is removed. Thus, a recess is formed.
Next, in the bottom plate portion forming step, the bottom plate portion is provided inside the peripheral wall portion (inside the recess).
Next, in the column erecting step, a plurality of columns are erect with respect to the inside of the peripheral wall portion (inside the recess).
Next, in the top plate portion forming step, a top plate portion is provided over the upper ends of the plurality of columns.
As described above, underground facilities are constructed.
Thus, in the underground facility construction method of the present invention, the underground facility can be provided efficiently.

  Further, in the underground facility construction method of the present invention, the peripheral wall portion (the inner side surface thereof becomes the inner wall surface of the concave portion) in the peripheral wall portion forming step before the earth and sand removal step (removing the portion of the earth and sand that is inside the concave portion). ) Is formed. For this reason, when removing earth and sand, since the part that will be the inner wall surface of the recess is already stable and the collapse of the earth and sand is prevented, there is no need to perform earth retaining work that is temporary work, In that respect, efficient construction can be performed.

  The invention according to claim 2 is the underground facility construction method of the invention according to claim 1, wherein the peripheral wall portion forming step is to ground the shaft-like material in the axial direction and having a vertical component. A method for constructing an underground facility, wherein the columnar portion is formed at a plurality of close points by causing the solidified material to flow out from the shaft-shaped material while proceeding toward the basement and retreating toward the ground. It is.

  The solidified material is allowed to flow out from the shaft-shaped material in any of the time point when the shaft-shaped material is advanced toward the underground and / or the time when the shaft-shaped material is retracted toward the ground.

In the underground facility construction method of the present invention, the following operations and effects are obtained in addition to the operations and effects of the underground facility construction method of the invention according to claim 1.
That is, in the peripheral wall forming step in the underground facility construction method of the present invention, the shaft-like material is advanced from the ground toward the underground along the direction of the axial direction and having the vertical component, and conversely, The solidified material is poured into the earth and sand along the passage path of the shaft-shaped material by causing the solidified material to flow out from the shaft-shaped material while being moved backward. Thus, a columnar portion is formed in the portion where the solidifying material is injected.
By performing the work at a plurality of points close to each other, a plurality of columnar parts are formed at close positions, a wall part is formed by the aggregate, and finally a peripheral wall part is formed.
Thus, in the underground facility construction method of the present invention, the peripheral wall portion is efficiently formed, and the underground facility construction method (peripheral wall portion forming step) of the invention according to claim 1 is more specifically and efficiently realized. Will be.

[Embodiment 1]
Next, Embodiment 1 of the present invention will be described with reference to FIGS.

First, as shown in FIGS. 1-3, a solidification material is inject | poured with respect to the earth and sand E which forms the ground, and the surrounding wall part 10 is formed (peripheral wall part formation process).
For this purpose, a boring machine (not shown in its entirety) is prepared. The boring machine has an excavation shaft (shaft-like material) D (see FIG. 1).
The excavation shaft D has a hollow shape, an outflow hole (not shown) is formed at the tip, and a helical blade (reference numeral is omitted) is formed at the outer periphery. The excavation shaft D may be provided with a special element (not shown) for stirring such as a stirring blade. The excavation axis D can rotate around its own central axis and can reciprocate in the axial direction.

Then, as shown in FIG. 1, the excavation axis D is rotated from the ground (above the ground surface S) while proceeding substantially vertically toward the basement, and then reversely rotated and moved backward substantially vertically toward the ground. At the same time, the solidified material (cement-based solidified material) introduced into the inside of the excavation shaft D is caused to flow out from the outflow hole at the tip.
Thus, the solidified material is injected (with stirring) into the earth and sand E of the portion (passage path) through which the excavation axis D has passed, and the columnar portion 12 is formed.
In addition, when the tip part (outflow hole part) of the excavation shaft D is in a position close to the ground surface S, the solidified material is not allowed to flow out of the outflow hole part, and the upper end part of the columnar part 12 is above the ground surface S. Also be positioned slightly lower.

As shown in FIG. 2, the above-described operation is performed at a plurality of close points along a predetermined line. It is preferable to carry out at each point in a plurality of rows (for example, 2 rows) instead of only one row. Thereby, the wall part 14 which has predetermined | prescribed thickness is formed.
By repeating this operation, as shown in FIG. 3, for example, two pairs of opposing wall portions 14 are formed. Thus, the peripheral wall portion 10 corresponding to the rectangular parallelepiped wall portion is formed in the basement. In FIG. 3 and subsequent figures, the shape of the peripheral wall 10 (each wall 14) is simply described for convenience.

Next, as shown in FIG. 4, the earth and sand E inside the peripheral wall part 10 is removed (earth and sand removal process).
That is, the earth and sand E of the portion is removed by the excavator.
To be precise, the earth and sand E of the portion surrounded by the virtual extension of the peripheral wall portion 10 to the ground surface S is removed, and the inner portion (the opposing wall portions 14) of the upper end portion of the peripheral wall portion 10 is removed. The earth and sand E on the upper side) is also removed.
Thus, a recess 15 (hole) surrounded by the peripheral wall 10 is formed.

Next, as shown in FIG. 5, the bottom plate portion 20 is provided inside the peripheral wall portion 10 (bottom plate portion forming step).
That is, the bottom plate portion 20 is formed by injecting a solidifying material (cement-based solidifying material) into the earth and sand E at the bottom of the concave portion 15.
The bottom plate portion 20 may be formed by hitting concrete or laying a plurality of reinforced concrete panels.

Next, as shown in FIG.6 and FIG.7, the some pillar 30 is erected with respect to the inside of the surrounding wall part 10 (column erection process).
That is, a plurality of pillars 30 (see FIG. 7) are prepared, and a plurality of foundation slabs 32 made of reinforced concrete are installed at the standing positions of the pillars 30 in the bottom slab portion 20, as shown in FIG. .
A plurality of anchor bolt insertion holes 33 are formed in the base plate 32.
In addition, the concrete may be cast in a portion where the base plate 32 is not installed, and the bottom surface of the facility may be flush with each other (all the same height as the top surface of the base plate 32).

Each column 30 (FIG. 7) is formed of steel frame, reinforced concrete, or the like. In the case of a steel frame, it is plated or painted for rust prevention (especially when this underground facility is an underground water storage facility). Further, the surface of the steel frame may be covered with concrete or mortar.
A flat plate-like support portion 35 is provided at the lower end of each column 30, and an anchor bolt 36 is coupled to each support portion 35. A protruding portion 31 is provided at the upper end of each column 30. As a general rule, the overhanging portion 31 is provided in four directions. In the pillars 30 erected at the edges and corners of the recess 15, some of them are not provided.

And each pillar 30 is mounted with respect to each foundation plate 32 by mounting each pillar 30 with respect to each foundation plate 32, filling each anchor bolt 36 in each anchor bolt insertion hole 33, and filling mortar. Fix it.
Thus, the plurality of pillars 30 are erected with respect to the recess 15.
The columns 30 are erected in a plurality of rows in the longitudinal direction (width direction of the recess 15) and in a plurality of rows in the lateral direction (depth direction of the recess 15) along the shape of the recess 15 (the peripheral wall portion 10).

  Next, as shown in FIG. 8, a beam 40 is provided over the upper ends of the plurality of columns 30 (beam arrangement step). That is, the beam 40 is fixed so that the adjacent pillars 30 (the projecting portions 31 thereof) are connected to each other.

Next, as shown in FIG. 9, the top plate part 50 is provided over the upper end part of the some pillar 30 (top plate part formation process).
That is, the top plate portion 50 is formed by installing a plurality of panels made of reinforced concrete or the like on the beam 40 or placing concrete on the beam 40.

  Next, as shown in FIG. 10, the earth and sand E is returned on the top plate portion 50 (including the vicinity thereof) (the earth and sand restoration process), and further, paved with concrete or asphalt as necessary. Do.

As described above, underground facilities are efficiently formed.
In addition, when this underground facility is an underground water storage facility for storing rainwater, etc., the connection with the inflow pipe into which rainwater flows in and the rainwater flow out as appropriate, together with or in parallel with the above-described operations. Connection to the outflow pipe is made.
In addition, when the underground facility requires water tightness, a water shielding material is appropriately provided to prevent inflow and outflow of water.

[Embodiment 2]
Next, a second embodiment of the present invention will be described based on FIG. 11 with a focus on differences from the first embodiment. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

The second embodiment is different from the first embodiment in the column erecting step.
That is, the plurality of pillars 130 have a pile shape and are longer than the pillars 30 of the first embodiment. The tip may be sharp.
Then, by striking each column 130 downward, each column 130 penetrates the bottom plate portion 20 (a bottom hole portion 122 may be formed in the bottom plate portion 20 in advance), and each column 130 The lower part of the inner part is supported in an embedded state with respect to earth and sand E located under the bottom plate part 20.
Thus, each pillar 130 is fixed.
Thereafter, the same operation as in the first embodiment is performed.

  It should be noted that the above is only a few embodiments of the present invention, and it is needless to say that the present invention can be implemented in various modifications based on the knowledge of those skilled in the art.

It is a longitudinal cross-sectional view which shows the surrounding wall part formation process (the halfway stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a top view which shows the surrounding wall part formation process (the halfway stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a figure which shows the surrounding wall part formation process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the earth and sand removal process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the baseplate part formation process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a figure which shows the pillar standing process (the halfway stage) of the underground water storage facility construction method of Embodiment 1 of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a figure which shows the pillar standing process (the substantially final stage) of the underground water storage facility construction method of Embodiment 1 of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a figure which shows the beam arrangement | positioning process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the top plate part arrangement | positioning process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the earth and sand restoration process (the last stage) of the underground water storage facility construction method of Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the pillar standing process (the almost final stage) of the underground water storage facility construction method of Embodiment 2 of this invention.

Explanation of symbols

10 Peripheral wall part 20 Bottom plate part 30 Column 50 Top plate part E Earth and sand

Claims (2)

An underground facility construction method for establishing an underground facility,
A peripheral wall portion forming step for injecting a solidifying material into the earth and sand forming the ground to form a peripheral wall portion,
Earth and sand removal step of removing earth and sand inside the peripheral wall,
A bottom plate portion forming step of providing a bottom plate portion inside the peripheral wall portion;
A column erecting step of erecting a plurality of columns with respect to the inside of the peripheral wall portion;
And a top plate portion forming step of providing a top plate portion over the top ends of the plurality of pillars. The underground facility construction method according to claim 1,
The peripheral wall portion forming step includes moving the solidified material from the shaft-shaped material while moving the shaft-shaped material from the ground along the direction having the vertical component in the axial direction and moving backward from the shaft toward the ground. Forming the columnar part by allowing it to flow out is performed at a plurality of close points,
Construction method for underground facilities.

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