JP2003193494A - Underground hollow structure constructing method and the underground hollow structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground hollow structure constructing method which dispenses with a cut beam or the like for retaining underground walls, to thereby shorten a construction period and cut construction costs. <P>SOLUTION: According to the method, the underground walls 2, 2 on both sides are connected together by a precast top slab member 12, and a lower portion of the top slab member 12 is excavated. Then, the underground walls 2, 2 are employed as side slab portions 16, 16 of the structure 21. The top slab member 12 functions as the cut beam with respect to the underground walls 2, 2 on both the sides, and resists back earth pressure, to thereby carry out excavation of a lower portion of the top slab member 12 as it is. Further, the width of the underground hollow structure 21 corresponds to an interval between the underground walls 2, 2, and therefore a plot in which construction is carried out need not have a wide width. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing an underground hollow structure such as a box culvert or a water channel provided with a top plate and an underground structure thereof.

[0002]

Conventionally, as an example of this type of underground hollow structure, a box culvert such as Japanese Patent Laid-Open No. 11-208835 is known, and in order to construct such a box culvert, As shown in FIG. 2 of the publication, continuous ground walls are provided on both sides of the place where the box culvert is laid, and then the space between the continuous ground walls is excavated.

This construction method will be described with reference to FIGS. 8 to 11. Continuous underground walls 2 and 2 are provided for excavation on both sides of one box culvert, and the distance between the continuous underground walls 2 and 2 is box. It is set wider than the culvert 1 and excavates between the continuous underground walls 2 and 2 to form an excavation hole 3 for laying a box culvert, and the continuous underground wall 2 serves as a retaining wall. In this case, since the back surface earth pressure is applied to the continuous underground wall 2 toward the excavation hole 3 side, if the excavation hole 3 becomes deep, anchors 4 may be provided in a plurality of steps on the continuous wall 2 as shown in FIG. ,
As shown in FIG. 10, it is necessary to prevent the collapse of the continuous wall 2 by providing a cross beam 5 between the continuous walls 2 and 2. Then, as shown in FIG. 11, after the box culvert 1 is laid in the drill hole 3, the drill hole 3 is backfilled.

In the conventional method as described above, the continuous underground wall 2 is constructed for excavation, but this is for erection, and after the box culvert 1 is laid, it is not backfilled and used. It was the current situation that construction of underground wall 2 required construction period and construction cost. In addition, since the continuous underground walls 2 and 2 are provided at intervals wider than the actual width of the box culvert 1 for construction, there is also a problem that the land width required for construction becomes large.

Therefore, an object of the present invention is to provide an underground hollow structure construction method and its underground hollow structure, which do not need to press the underground wall with a beam or the like and can reduce the construction period and cost. To do.

[0006]

The invention according to claim 1 is an underground hollow structure in which underground walls are provided on both sides, excavation is performed between the underground walls, and hollow structures are provided between the underground walls. In the construction method of 1., after connecting the underground walls on both sides with a top plate member made of precast, the bottom of the top plate member is excavated, a bottom is formed in the excavated drill hole, and the underground wall is structured. This is the construction method for the side slab of the product.

According to the structure of claim 1, by connecting the ground walls on both sides by the top plate members, the top plate members act as a cutting beam on the ground walls on both sides, and the top plate members are directly connected. You can drill down. By excavating between the underground walls in this way and using the underground wall as the side slab of the structure, there is no need for backfilling, and an underground hollow structure including the underground wall and the top plate member can be obtained. Since the width of this underground hollow structure corresponds to the distance between the underground walls, the land width can be reduced during construction.

The invention according to claim 2 is a construction method in which an inner plate portion is provided inside the underground wall.

In the structure of the second aspect, the inner surface of the underground wall is finished by the inner plate portion, and the strength can be improved by the amount of the inner plate portion. Further, since the inner plate portion can be constructed in the space after excavation, the construction cost is lower than that of constructing the underground wall thick.

Further, the invention of claim 3 is a construction method in which the bottom portion is a concrete bottom plate portion provided between the underground walls on both sides.

According to the third aspect of the invention, the side slabs on both sides are connected by the bottom slab, and the strength of the underground hollow structure is improved.

The invention according to claim 4 is an underground hollow structure constructed by the construction method according to claim 3. It is a thing.

According to the structure of claim 4, a box-like underground structure in which the top plate member, the side plate portion and the bottom plate portion are integrated is obtained.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show the first embodiment of the present invention, and the same parts as those in FIGS. 8 to 11 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

The continuous underground wall 2 is composed of a precast concrete wall formed by driving a precast concrete slab into the ground, a cast-in-place concrete wall in which concrete is placed at an excavation site, and a cement liquid is poured and mixed at the same time as excavation. It is continuously provided in the length direction by a soil cement wall or a steel sheet pile wall formed by a steel sheet pile or the like. In the following description, the continuous underground wall 2 is referred to as a structure.
An example is shown in which the precast concrete slabs 11 are punched in and arranged in the length direction of 21.

First, as shown in FIG. 2, after forming continuous underground walls 2 and 2 on both sides, the upper portions of these continuous walls 2 and 2 are connected by a substantially flat plate-shaped top plate member 12 made of precast concrete. . In this case, the joining member 13 is projected on the upper surface of the concrete slab 11, and the joining member 13 is attached to the top slab member 12.
The top plate member 12 is integrally connected between the upper portions of the underground walls 2 and 2 by connecting to the ground plate 2, and after the connection, the excavation below the top plate member 12 is performed. As shown in FIG. 2, the top plate member 12
To facilitate the work of connecting the underground wall 2 to the underground wall 2,
The upper part between the two can be excavated.

In excavation after the top plate member 12 is connected, the top plate member 12 acts as a cutting beam, and therefore the underground walls 2, 2
In addition, it is not necessary to separately provide an anchor or a cutting beam, and if the top plate member 12 is provided without a gap, it is possible to prevent noise of excavation work below the top plate member 12 from leaking to the outside.

As shown in FIG. 3, below the top plate member 12,
The excavation hole 3 is formed so that the inner surfaces of the underground walls 2 and 2 are exposed, and the bottom surface 3T of the excavation hole 3 is laid flat. After this, in this example, the bottom slab 14 is formed on the bottom surface 3T by the cast-in-place concrete and the inner slab is formed on the inner surface of the underground wall 2.
15 is formed, and the side plate portion 16 in which the inner plate portion 15 and the underground wall 2 are integrated is formed. Further, the top plate member 12 is a structure 21.
Are continuously provided in the length direction of the above with no gaps, a cast-in-place concrete layer 17 is provided on the upper surface thereof, and a top slab portion 18 made of a composite beam of the top slab member 12 and the concrete layer 17 is formed. The top plate member 12 alone may constitute the top plate portion. In this way, as shown in FIG.
A box culvert underground structure 21 including 18 and side slabs 16 and 16 and a bottom slab 14 is formed.

The bottom slab portion 14 and the inner slab portion 15 may be made of precast concrete. The bottom slab portion 14 and the inner slab portion 15 are integrated with each other by a joining member and the inner slab portion 15 is joined by a joining member. It is preferable to be integrated with the underground wall 2 by the above. Further, the grounds G on both sides of the structure 21 are formed flush with the upper surface of the structure 21 after the construction, as shown in FIG.

As described above, in this embodiment, the underground walls 2 and 2 are provided on both sides according to claim 1, and the underground walls 2 and 2 are provided.
In the method of constructing an underground hollow structure in which a hollow structure is provided between the underground walls 2 and 2 by excavating between the two, the underground walls 2 and 2 on both sides are connected by a precast top plate member 12. After that, the lower part of the top plate member 12 is excavated, the bottom part 3T is formed in the excavated hole 3, and the underground walls 2 and 2 are used as the side plate parts 16 and 16 of the structure 21. The middle walls 2 and 2 are top plate members
By connecting with the top plate member 12, the top plate member 12 acts as a cutting beam on the underground walls 2 and 2 on both sides to counter the earth pressure on the back surface, and the lower part of the top plate member 12 can be excavated as it is. . In this way, since the underground walls 2 and 2 are excavated and the underground walls 2 and 2 are used as the side plate portion 16 of the structure 21, there is no need for backfilling, and the underground walls 2 and 2 and the top plate are not necessary. An underground hollow structure provided with the member 12 is obtained, and the width of this underground hollow structure 21 corresponds to the interval between the underground walls 2 and 2. Therefore, the site width can be reduced in construction.

As described above, in this embodiment, since the inner plate portions 15 and 15 are provided inside the underground walls 2 and 2 according to the second aspect, the inner plate portion 15 serves to protect the underground wall 2. The inner surface can be finished and the strength can be improved by the amount of the inner plate portion 15. Since the inner plate portion 15 can be constructed in the open space of the excavation hole 3 after excavation, it is possible to construct the inner wall portion 2 thicker than
The cost of construction will be low.

As described above, in this embodiment, the bottom is the concrete bottom plate portion 14 provided between the underground walls 2 and 2 on both sides, and the side plate portions on both sides are provided. 16 are connected by the bottom slab 14, and the strength of the underground hollow structure 21 is improved.

As described above, in this embodiment, since it is the underground structure 21 constructed by the construction method according to claim 3 in accordance with claim 4, the top plate member 12 and the side plate parts 16, 16 are Bottom plate
A box culvert that is a box-like underground structure 21 in which 14 and 14 are integrated is obtained.

Further, as an effect of the embodiment, since the concrete slab 11 is provided with the joining member 13 in advance, the top slab member
Connection work with 12 becomes easy.

FIG. 4 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Concrete and flat plate-shaped bottom plate members 14A are lined up on the bottom part 3T without gaps to form the bottom plate part 14, and the side plate part 16 and the bottom plate member 14A are joined by a joining member 31 such as a reinforcing bar. The joining member 31 may be not only a reinforcing bar projecting on the inner surface of the side plate portion 16 but also an anchor embedded in the inner surface of the side plate portion 16 or attached later.

As described above, in the present embodiment, since the bottom slab portion 14 is formed by the bottom slab member 14A of the precast product, it is possible to reduce the work of casting in-situ and shorten the construction period.

FIG. 5 shows a third embodiment of the present invention, in which the same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Using the top plate member 32, the top plate members 32 are arranged in the longitudinal direction of the structure 21 without a gap to form the top plate portion 18, and the top plate portion 18 is backfilled, and the top plate portion 18 is Since it has an arched shape, it can be backfilled, etc., and a structure 21 excellent in strength against an upper load can be obtained.

FIG. 6 shows a fourth embodiment of the present invention, in which the same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Using the top plate member 33 having a space 36 between the horizontal portion 35 and
The top plate members 33 are arranged in the longitudinal direction of the structure 21 without a gap to form the top plate portion 18, and the top plate portion 18 is backfilled, and the top plate portion 18 receiving a load has an arch shape. The structure that has been backfilled and has excellent strength against the upper load.
You get 21.

Further, in this example, when a load is applied to the arch portion 34, a force that spreads the lower end of the arch portion 34 to both sides is generated, but since this is regulated by the horizontal portion 35, it is against the load from above. Since even better strength can be obtained and, at the same time, the space portion 36 is partitioned from the lower space, it is suitable for inserting and storing wirings and pipes such as various cables and pipes.

FIG. 7 shows a fourth embodiment of the present invention, in which the same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. This is an example suitable for the structure 21, in which an intermediate underground wall 2A is provided between the underground walls 2 and 2 on both sides, a passage is formed on both sides of the central underground wall 2A, and the underground wall 2 on the left side is formed. And the central underground wall 2A are connected by the top plate member 12, and the central underground wall 2A and the right underground wall 2 are connected by the top plate member 12, so the top plate members 12, 12 After the installation, the lower part of the top plate member 12 can be excavated.

As described above, in the present embodiment, the underground walls 2 and 2 are provided on both sides, and the continuous underground wall 2A having the same structure as the underground wall 2 is provided substantially in the middle of the underground walls 2 and 2. Middle wall 2, 2A
In the method for constructing an underground hollow structure in which a hollow structure is provided between the underground walls 2 and 2A by excavating between the underground walls 2 and 2A, after connecting adjacent underground walls 2 and 2A with a precast top plate member 12. , The lower part of the top plate member 12 is excavated, the bottom part 3T is formed in the excavated excavation hole 3, and the underground walls 2 and 2A are provided to the structure 21.
Since the side plate portion 16 of the top plate member 12 is on both sides of the underground wall 2,
It acts as a cross beam against 2A to counter the earth pressure on the back,
The lower part of the top plate member 12 can be excavated as it is.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the bottom slab portion 14 and the inner slab portion 15 provided by cast-in-place concrete do not necessarily have to be provided, and as shown in FIG. 3, the underground walls 2, 2 and the top slab member 12 constitute an underground hollow structure. be able to. Also,
The upper part of the underground hollow structure may be exposed above the ground. Further, the top plate portion does not have to be provided over the entire length of the structure, and may be provided between the underground walls so as to prevent the underground walls from collapsing at least before excavation for construction.

[0033]

According to the first aspect of the present invention, there is provided a method for constructing an underground hollow structure, in which underground walls are provided on both sides, excavation is performed between the underground walls, and hollow structures are provided between the underground walls. ,
After connecting the underground walls on both sides by a precast top plate member, the bottom of the top plate member is excavated, a bottom is formed in the excavated hole, and the underground wall is a side plate part of a structure. It is possible to provide a construction method for an underground hollow structure that does not need to press the underground wall with a beam or the like and can reduce the construction period and construction cost.

The invention according to claim 2 is a construction method in which an inner plate portion is provided inside the underground wall, and it is not necessary to press the underground wall with a beam or the like, so that the construction period and the construction cost can be reduced. It is possible to provide a method for constructing an underground hollow structure.

The invention of claim 3 is a construction method in which the bottom portion is a concrete bottom slab portion provided between the underground walls on both sides, and it is not necessary to press the underground wall with a cutting beam or the like. It is possible to provide a method for constructing an underground hollow structure that can reduce the construction period and construction cost.

The invention of claim 4 is an underground hollow structure constructed by the construction method of claim 3. Therefore, it is possible to provide an underground hollow structure capable of reducing the construction period and the construction cost without having to press down the underground wall with a beam or the like.

[Brief description of drawings]

FIG. 1 is a sectional view of an underground underground structure showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which underground walls are connected by a top plate member during the construction.

FIG. 3 is a sectional view showing a state in which an excavation hole is formed in the middle of the construction.

FIG. 4 is a cross-sectional view around the bottom of an underground hollow structure showing a second embodiment of the present invention.

FIG. 5 is a sectional view of an underground underground structure showing a third embodiment of the present invention.

FIG. 6 is a sectional view of an underground underground structure showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view of an underground underground structure showing a fifth embodiment of the present invention.

FIG. 8 is a sectional view of an underground wall illustrating a conventional example.

FIG. 9 is a sectional view showing an excavated state of the same.

FIG. 10 is a cross-sectional view showing another excavation state of the above.

FIG. 11 is a sectional view of the underground hollow structure of the above.

[Explanation of symbols]

2 underground wall 3 drilling holes 3T bottom 12 Top plate member 14 Bottom plate 15 Inside plate 16 Side plate 18 Top plate 21 Underground structure 32 Top plate member 33 Top plate member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasushi Isaka             1-8-23 Bentenbashi Dori, Niigata City, Niigata Prefecture             Inside this SUMICON CORPORATION F-term (reference) 2D047 AB08

Claims (4)

[Claims] 1. A method of constructing an underground hollow structure, wherein underground walls are provided on both sides, a space between these underground walls is excavated, and a hollow structure is provided between the underground walls. After being connected by a precast top plate member, the lower part of the top plate member is excavated to form a bottom portion in the excavated hole,
A method for constructing an underground hollow structure, wherein the underground wall is a side slab of the structure. 2. The method for constructing an underground hollow structure according to claim 1, wherein an inner plate portion is provided inside the underground wall. 3. The method for constructing an underground hollow structure according to claim 1, wherein the bottom portion is a concrete bottom slab portion provided between the underground walls on both sides. 4. An underground hollow structure constructed by the construction method according to claim 3.