JP2002061204A - Construction method of underground structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an underground structural body capable of forming a footing wider than the underground structural body even if a caisson method is used. SOLUTION: When the underground structural body is constructed by using a side wall body 4 constituted of an interior wall board and an exterior wall board, at the same time, constituted by forming a space filled with a concrete between both wall boards and forming a surrounded space 3 of the interior wall board in the center, the construction method is so constituted that the side wall body 4 is pressed in the ground in a state to mount an edge body to the lower end, at the same time, the inside of the surrounded space 3 is excavated to make the side wall body 4 settle down up to a certain depth, concrete-made sheet piles P for preventing the collapse of earth and sand from the upper part of the edge body are projected outward and that the lower parts of the concrete-made sheet piles P and the side wall body 4 are excavated to form the footing 41 in a range wider than the bottom of the side wall body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for constructing an underground structure.

[0002]

2. Description of the Related Art Conventionally, when an underground structure such as a basement is constructed, there are an open method and a caisson method. However, compared to the open method in which a hole one size larger than the underground structure is excavated using a civil engineering machine. In some cases, the caisson method, in which excavation work by a civil engineering machine and press-fitting work of an underground structure into the ground by a hydraulic jack are more excellent in working efficiency.

[0003]

However, according to the caisson method, at least the side wall of the underground structure is pressed into the ground using a hydraulic jack or the like. Could not be built inside.

Accordingly, an object of the present invention is to provide a method of constructing an underground structure capable of forming a foundation wider than an underground structure even when the caisson method is used.

[0005]

According to a first aspect of the present invention, there is provided a method for constructing an underground structure, comprising an inner wall plate and an outer wall plate, and a concrete filling space between the two wall plates. A method of constructing an underground structure using a side wall body in which a space part is formed and a surrounding space part is formed by an inner wall plate at the center, wherein the side wall body is attached with a cutting edge body at a lower end thereof. In this state, the ground is pressed into the ground and excavated in the surrounding space to lower the side wall to a predetermined depth, and then a sediment support member for preventing the collapse of the sediment from the upper part of the blade body is projected outward. Then, the earth and sand supporting member and the lower part of the side wall body are excavated to form a foundation wider than the bottom surface of the side wall body.

According to a second aspect of the present invention, there is provided a method of constructing an underground structure, comprising an inner wall plate and an outer wall plate, a space for filling concrete is formed between the two wall plates, and the inner wall plate is provided at the center. A method for constructing an underground structure using a side wall body having a surrounding space portion formed therein, wherein the side wall body is press-fitted into the ground with a cutting edge body attached to a lower end thereof, and a bent space is formed. Excavating the inside, lowering the side wall body to a predetermined depth, and then protruding outwardly a sediment supporting member for preventing the collapse of the sediment from the upper part of the blade body, then, the sediment supporting member and the side wall body Is formed by excavating a lower portion of the bottom wall to form a foundation wider than the bottom surface of the side wall body, and then placing the bottom wall body in the surrounding space.

According to a third aspect of the present invention, in the construction method of the first or second aspect, a water tank is placed on an upper portion of the side wall body and water is injected into the water tank. By doing so, the side wall body is settled.

According to a fourth aspect of the present invention, there is provided a method of constructing an underground structure according to any one of the first to third aspects, wherein concrete is filled in the space of the side wall.

According to a fifth aspect of the present invention, there is provided a method of constructing an underground structure according to any one of the first to fourth aspects, wherein concrete is pressed into the side wall from the bottom wall.

A method for constructing an underground structure according to claim 6 comprises an inner wall plate and an outer wall plate detachably provided to the inner wall plate, and a space for filling concrete between the two wall plates. A method of constructing an underground structure using a side wall having a portion formed and a surrounding space portion formed by an inner wall plate in the center, wherein the side wall is attached with a cutting edge at its lower end. , Press-fit into the ground and excavate the inside of the bent space to lower the side wall body to a predetermined depth, and then, from the upper part of the blade body, a floating prevention member for preventing the side wall body from floating, In this method, the earth and sand supporting member for preventing collapse is projected outward, and then the earth and sand supporting member and the lower part of the side wall are excavated to form a foundation wider than the bottom surface of the side wall.

According to a seventh aspect of the present invention, there is provided a method for constructing an underground structure, comprising an inner wall plate and an outer wall plate detachably provided to the inner wall plate, and a space for filling concrete between the two wall plates. A method of constructing an underground structure using a side wall having a portion formed and a surrounding space portion formed by an inner wall plate in the center, wherein the side wall is attached with a cutting edge at its lower end. , Press-fit into the ground and excavate the inside of the bent space to lower the side wall body to a predetermined depth, and then, from the upper part of the blade body, a floating prevention member for preventing the side wall body from floating, The earth and sand support member for preventing collapse is projected outward, and then the lower part of the earth and sand support member and the side wall body is excavated to form a foundation wider than the bottom surface of the side wall body. Place the bottom wall on It is a method.

According to a construction method for an underground structure according to claim 8, in the construction method according to claim 6 or 7, a water tank is placed on an upper portion of the side wall body and water is injected into the water tank. By doing so, the side wall body is settled.

According to a ninth aspect of the present invention, in the method of constructing an underground structure, a buoyancy member is provided on the inner surface of the outer wall plate.

According to a tenth aspect of the present invention, there is provided a method of constructing an underground structure according to any one of the sixth to ninth aspects, wherein concrete is filled in a space of the side wall body, and then the outer wall plate is formed on the side wall body. It is a method of removing.

The method for constructing an underground structure according to claim 11 is the method for constructing an underground structure according to any one of claims 6 to 9, wherein concrete is press-fitted from the bottom wall into the space of the side wall, and then the side wall is formed. This is a method of removing the outer wall plate of the body.

According to each of the construction methods described above, after the side wall body is pressed into the ground at a predetermined depth, the earth and sand supporting member is projected outward from the upper portion of the blade body provided at the lower end thereof. Preventing the collapse of earth and sand outside the side wall body, and excavating a hole wider than the bottom of the side wall body below it to form the foundation, so while using the caisson method, it is better than the underground structure Can form a broad foundation.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for constructing an underground structure according to a first embodiment of the present invention will be described below with reference to FIGS.

In this construction method, at least the side wall body of the underground structure is pressed into the ground. First, the basic structure of the underground structure will be described. As shown in FIG. 1, the underground structure 1 includes, for example, a side wall body 4 in which four side wall panels 2 are assembled into a rectangular shape (annular shape) and a surrounding space portion 3 is formed in the center. A bottom wall 5 is disposed at the lower end of the surrounding space 3 of the body 4, and an upper wall 6 is disposed to cover the surrounding space 3 of the side wall 4.

The side wall member 4, the bottom wall member 5 and the upper wall member 6 are each composed of an inner wall plate and an outer wall plate, and a space for concrete filling is formed between the two wall plates. It has a shell structure, and each of these walls 4 to 6 is composed of a plurality of panels. Of course, one sheet may be used.

Here, the side wall member 4 will be described. That is, as shown in FIG. 2, the side wall panel 2 constituting the side wall body 4 includes an inner plate portion (corresponding to an inner wall plate) 11, an outer plate portion (corresponding to an outer wall plate) 12, and both of these plate portions. 11,12
End plate portions 13 provided at the ends of each other;
It comprises a plurality of reinforcing plate portions 15 arranged vertically and horizontally at predetermined intervals in a concrete filling space 14 formed by 1 to 13. In addition, when each of these reinforcing plate portions 15 is filled with ready-mixed concrete,
A plurality of communication holes 16 are formed so as to cover the entirety.

The bottom wall 5 and the upper wall 6 also have an inner plate (corresponding to an inner wall) 11 and an outer plate (corresponding to an outer wall) 12 similarly to the side wall 4. And an end plate portion 13 provided at an end between the two plate portions 11 and 12.
And a plurality of reinforcing plate portions 15 arranged at predetermined intervals and vertically and horizontally in a space portion 14 for concrete filling formed by these plate portions 11 to 13 and formed with a communication hole 16. Have been.

On the entire bottom surface (entire periphery) of the rectangular lower end portion of the side wall member 4, there is provided a blade opening 21 for facilitating press-fitting the side wall member 4 into the ground. Body 21 is
A blade beam 22 having a cross section formed at an acute angle, and the blade beam 2
And a mounting frame portion 23 for detachably mounting the sheet pile 2 on the side wall body 4 side. The mounting frame portion 23 has an opening through which a concrete sheet pile P serving as a sediment supporting member projects. A large number of 24 are formed in two steps vertically and alternately, that is, in a staggered manner along the periphery of the side wall body 4. In FIG. 2, the concrete sheet pile P is illustrated in two stages, but in FIGS. 5 to 8, only one is illustrated.

Hereinafter, a method of constructing an underground structure will be described. First, as shown in FIG.
Are connected in a rectangular shape by using a connecting tool such as a bolt and a nut to assemble the side wall body 4 and then excavated by a power shovel (not shown) to a certain depth in a construction site of the underground structure. Is placed (inserted) in the hole H provided. At this time, the power shovel is placed in the hole H as it is, so that the power shovel is located in the surrounding space 3 of the placed side wall 4. Of course, the side wall body 4
May be placed in the hole H, and then a power shovel may be arranged in the surrounding space 3.

Next, as shown in FIG. 4, a plurality of pressing beam members 31 are laid over the upper surface of the side wall member 4, and a hydraulic jack 32 as a press-fitting device is connected to both ends. Note that the hydraulic jack 32 is fixed to an anchor member 33 that is cast on the ground.

Next, the ground in the surrounding space 3 is excavated by a power shovel, and the pressing beam 31 is pulled downward by the hydraulic jack 32 to press the side wall 4 into the ground. Of course, the press-fitting work of the side wall body 4 is facilitated by the blade body 21 provided around the entire lower end of the side wall body 4.

As shown in FIG. 5, when the excavating work of the power shovel and the press-fitting work by the hydraulic jack 32 are repeatedly performed, and the side wall body 4 sinks (attains) to a predetermined installation depth, the cutting edge beam 22 A concrete sheet pile P, which is a sediment supporting member, is projected outward and horizontally into the ground by a civil engineering machine, for example, a hydraulic jack, from a large number of openings 24 formed in the mounting frame portion 23 of FIG. Let it.

Of course, the work of projecting the concrete sheet pile P is performed around the entire periphery of the side wall 4. Thereby, the collapse of the earth and sand around the entire side wall body 4 is prevented. When the collapse of the soil is prevented, only the entire cutting edge beam 22 of the cutting edge body 21 is removed, and then the lower part of the side wall body 4 is formed using a power shovel arranged in the surrounding space 3. And the lower part of the concrete sheet pile P is excavated over a predetermined range, and the size of the foundation of the underground structure to be built from now, that is, the foundation space S having an area larger than the entire bottom surface of the side wall 4 is formed.

Next, as shown in FIG. 7, after the reinforcing bar T is disposed in the foundation space S, the fresh concrete C is filled to cover the area below the side wall body 4 and larger than the lower surface of the side wall body 4. To form a foundation 41 having. At this time, the side wall body 4
It is welded to the rebar or a base bolt B is provided.

Next, at the lower end inside the surrounding space 3,
Similarly, the bottom wall 5 composed of the inner plate 11, the outer plate 12, and the reinforcing plate 15 having the communication hole 16 is arranged, and is fixed to the side wall 4 by a connecting tool 7 such as a bolt and a nut.

Next, fresh concrete is filled in each space portion 14 of the side wall member 4 and the bottom wall member 5 and through the through holes 5a formed in the bottom wall member 5, the foundation 41 and the bottom wall member 5 are formed. Is filled with mortar M.

Then, as shown in FIG. 8, after the necessary members are arranged in the surrounding space 3 of the side wall 4 to which the bottom wall 5 is attached, the upper wall 6 is placed on the upper end of the side wall 4. At the same time, it is fixed with a connecting member 7 such as a bolt and a nut (see FIG. 2), and then the space portion 14 of the upper wall 6 is filled with fresh concrete (the concrete may be filled in advance). Finally, the underground structure 1 is constructed by putting earth and sand above the upper wall body 6.

After the side wall member 4 is press-fitted to a predetermined depth by the press-fitting hydraulic jack 32, the mounting frame for mounting the blade beam 22 provided at the lower end of the side wall member 4 is provided. 23, a concrete sheet pile P, which is a sediment support member, protrudes outward from the opening 24 of the side wall member 4.
To prevent the collapse of the earth and sand outside of the concrete sheet pile P, excavate below the concrete sheet pile P to form a foundation space S having an area larger than the bottom surface of the side wall body 4, and form the foundation 41 here. Because it was caisson method,
A stable foundation wider than the underground structure can be easily provided.

In the first embodiment,
After the side wall body was pressed into the ground at a predetermined depth, the space was filled with ready-mixed concrete.For example, the space in the side wall body was previously filled with concrete and dried to some extent, and the side wall body itself was filled. By increasing the rigidity and increasing the weight, the work of press-fitting the side wall body into the ground may be facilitated.

Next, a method of constructing an underground structure according to the second embodiment of the present invention will be described with reference to FIG. In the first embodiment, after the ready-mixed concrete is filled in the space in the side panel constituting the side wall body, the side wall body is left as it is.
In the second embodiment, the outer plate portion of the side wall body is removed at a stage where the filled concrete does not dry.

That is, as shown in FIG. 9, an outer plate portion arranged opposite to an inner plate portion 52 of a side wall panel 51 constituting a side wall body used in the construction method according to the second embodiment. 53 is a bent portion 54a formed by bending an outer edge of an end plate portion 54 provided at an end portion, and a flange portion 55a formed on an outer edge of a reinforcing plate portion 55 (55A) at a predetermined position.
And the other reinforcing plate portion 55 (55B) is provided so as to be freely inserted and removed from above. Of course, this outer plate 5
A plurality 3 is provided.

In addition, the concrete sheet pile as the earth and sand support member is staggeredly protruded above the blade body of the first embodiment. However, in the second embodiment, of the two upper and lower steps, For example, a concrete sheet pile having a protruding length longer than a concrete sheet pile as a lower-level earth and sand support member is used as a buoyancy preventing member for preventing the side wall body, that is, the underground structure from rising, on the upper side. In other words, the upper concrete sheet pile is protruded deeper into the ground, and the lifting of the underground structure is reliably prevented.

The only difference from the underground structure in the first embodiment is the portion relating to the side walls, and the other walls have the same structure. Hereinafter, a construction method in this case will be described. However, since the construction method is basically the same as that of the first embodiment, the construction method will be briefly described without using the drawing again.

That is, after the side wall body assembled into a rectangular shape by the side wall panel and the lower end thereof is attached to the lower end thereof is lowered to a predetermined depth using a power shovel and a hydraulic jack for press-fitting, the buoyancy preventing member is provided. In addition, a concrete sheet pile, which is a sediment supporting member, is protruded into the ground to prevent the side wall body from rising (finally preventing the underground structure from rising) and to prevent the soil from collapsing.

Next, a base space wider than the entire bottom surface of the side wall body is formed by excavating below the side wall body and the concrete sheet pile, and then a reinforcing bar is arranged in this base space and filled with fresh concrete to form a base. I do.

After each of the space portions of the side wall body and the bottom wall body is filled with the ready-mixed concrete, the concrete filled in the side wall body, that is, the space portion of the side wall panel, is not dried.
After pulling out the outer plate of the side wall panel and arranging necessary members in the surrounding space, the upper wall may be placed and fixed.

According to this construction method, at least the outer plate portion 53 of the side wall panel 51 can be reused, which is economical. By the way, in the second embodiment,
Although the outer panel of the side wall panel is drawn upward, the buoyancy member 6 such as styrofoam is attached to the outer panel 52 as shown by a virtual line in FIG.
1 may be attached.

In each of the above embodiments, the hydraulic jack is used to lower the side wall. For example, a water tank is placed on the upper surface of the side wall, and water is poured into the water tank. May be settled by the weight of water.

In this case, the inside of the water tank is divided into a plurality of sections, and the amount of water to be filled in each of the compartments is adjusted in accordance with the sinking attitude of the side wall, thereby controlling the sinking attitude of the side wall. be able to. That is, it is possible to sink vertically without tilting the side wall body. Of course, a plurality of water tanks may be arranged instead of partitioning the inside of the water tank. Further, the respective partition portions or the water tanks may be connected by a connecting pipe such as a hose so that water can be easily injected.

Further, in each of the above embodiments, when the bottom wall and the side wall are filled with the ready-mixed concrete, the bottom wall and the side wall may be separately filled, or formed on the bottom wall. From the filling hole, first, filling is performed in the space of the bottom wall, and in the space of the side wall (each side wall panel) communicated with the bottom wall through a communicating portion (for example, a communicating hole),
Fresh concrete may be press-fitted.

Further, the timing of filling the side wall, the bottom wall, and the upper wall with the ready-mixed concrete is not limited to that described in each of the above-described embodiments. , Can be done freely.

Although a concrete sheet pile is used as the earth and sand support member in each of the above embodiments, for example, a steel sheet, a steel sheet pile or the like may be used.

[0047]

As described above, according to the method of constructing an underground structure of the present invention, after the side wall body is pressed into the ground at a predetermined depth, the side wall body is pressed from the upper part of the blade body provided at the lower end thereof. The caisson method was adopted because the sediment support member protruded outward to prevent the collapse of the sediment outside the side wall body, and a hole wider than the bottom of the side wall body was excavated below it to form the foundation. However, it can form a stable foundation that is wider than underground structures.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an underground structure according to a construction method according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the underground structure.

FIG. 3 is a schematic sectional view illustrating a procedure of the construction method.

FIG. 4 is a schematic sectional view illustrating a procedure of the construction method.

FIG. 5 is a schematic sectional view illustrating a procedure of the construction method.

FIG. 6 is a schematic cross-sectional view illustrating a procedure of the construction method.

FIG. 7 is an essential part cross sectional view for explaining the procedure of the same construction method.

FIG. 8 is a schematic sectional view illustrating a procedure of the construction method.

FIG. 9 is a sectional view of a main part of an underground structure according to a construction method according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground structure 2 Side wall panel 3 Surrounding space part 4 Side wall body 5 Bottom wall body 6 Top wall body 11 Inner plate part 12 Outer plate part 13 End plate part 14 Space part 15 Reinforcement plate part 16 Communication hole 21 Blade body 22 Blade Spout 23 Mounting frame 24 Opening 41 Foundation 51 Side wall panel 52 Inner plate 53 Outer plate 54 End plate 54a Bend 55 Reinforcement 55a Flange 61 Buoyancy member

Claims (11)

[Claims] 1. A side wall comprising an inner wall plate and an outer wall plate, a space for concrete filling is formed between the two wall plates, and a surrounding space is formed in the center by the inner wall plate. A method of constructing an underground structure, wherein the side wall body is attached with a cutting edge body at a lower end thereof.
Pressing into the ground and excavating the inside of the surrounding space to lower the side wall body to a predetermined depth, and then protruding outward a sediment support member for preventing sediment collapse from the upper part of the blade body. And excavating a lower portion of the sediment supporting member and the side wall body to form a foundation wider than a bottom surface of the side wall body. 2. A side wall comprising an inner wall plate and an outer wall plate, a space for concrete filling is formed between the two wall plates, and a surrounding space is formed in the center by the inner wall plate. A method of constructing an underground structure, wherein the side wall body is attached with a cutting edge body at a lower end thereof.
Pressing into the ground and excavating the inside of the surrounding space to lower the side wall body to a predetermined depth, and then protruding outward a sediment support member for preventing sediment collapse from the upper part of the blade body. Underground structure characterized by excavating a lower portion of the sediment supporting member and the side wall body to form a foundation wider than a bottom surface of the side wall body, and then disposing a bottom wall body in the surrounding space portion. How to build. 3. The underground structure according to claim 1, wherein a water tank is mounted on an upper portion of the side wall body, and water is injected into the water tank to lower the side wall body. How to build. 4. The method for constructing an underground structure according to claim 1, wherein concrete is filled in a space portion of the side wall body. 5. The method for constructing an underground structure according to claim 1, wherein concrete is pressed into the side wall from the bottom wall. 6. An inner wall plate and an outer wall plate detachably provided to the inner wall plate, a space for concrete filling is formed between the two wall plates, and a space surrounded by the inner wall plate at the center. It is a method of constructing an underground structure using a side wall body formed with, wherein said side wall body, with a cutting edge body attached to the lower end thereof,
It is pressed into the ground and excavates the inside of the surrounding space to lower the side wall body to a predetermined depth. Then, from the upper part of the blade body, a floating prevention member for preventing the side wall body from floating and collapse of earth and sand. An underground structure characterized by projecting a sediment support member outwardly to prevent the sediment outward, and then excavating a lower part of the sediment support member and the side wall body to form a foundation wider than the bottom surface of the side wall body. How to build. 7. An inner wall plate and an outer wall plate detachably provided to the inner wall plate, a space for concrete filling is formed between the two wall plates, and a space surrounded by the inner wall plate at the center. It is a method of constructing an underground structure using a side wall body formed by forming the above-mentioned side wall body, with a blade body attached to a lower end thereof,
It is pressed into the ground and excavates the inside of the surrounding space to lower the side wall body to a predetermined depth. Then, from the upper part of the blade body, a floating prevention member for preventing the side wall body from floating and collapse of earth and sand. The earth and sand support member for preventing the above is protruded outward, and then the earth and sand support member and the lower part of the side wall body are excavated to form a foundation wider than the bottom surface of the side wall body. A method for constructing an underground structure, comprising disposing a bottom wall. 8. The underground structure according to claim 6, wherein a water tank is mounted on the upper part of the side wall body, and water is poured into the water tank to sink the side wall body. How to build. 9. The method for constructing an underground structure according to claim 6, wherein a buoyancy member is provided on an inner surface of the outer wall plate. 10. The method of constructing an underground structure according to claim 6, wherein the outer wall plate of the side wall body is removed after filling the space portion of the side wall body with concrete. 11. The method for constructing an underground structure according to claim 6, wherein concrete is press-fitted into the space of the side wall from the bottom wall, and then the outer wall plate on the side wall is removed. .