JP3888564B2 - Construction method of underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing underground structures, particularly underground structures such as LNG tanks.
[0002]
[Prior art]
Underground space is used for various applications by taking advantage of underground properties such as constant temperature, air tightness, incombustibility, explosion proof, high rigidity, etc., but oil underground storage, LNG and LPG tanks, pressurized air for gas turbine power generation Active use of underground space is being implemented or studied for energy facilities such as storage tanks, superconducting coil power storage, and nuclear power plants.
[0003]
In order to construct such an underground structure, for example, an LNG tank, as shown in the example of FIG. 7, first, an annular underground continuous wall 1 is constructed from the ground surface 9 which is the ground surface at the beginning of construction, and then the While the underground continuous wall 1 is used as a retaining wall, the inner space 2 surrounded by it is dug down. And after constructing the bottom plate 3 at the bottom of the internal space, if the side walls 4 are constructed at regular heights (lots) sequentially from the periphery of the bottom plate, and the side walls are completed to the top, The roof 6 is bridged over the top.
[0004]
On the other hand, it is common to perform necessary facilities work in parallel with these civil works or after completion of the civil works, and finally, the embankment 8 is constructed to complete the LNG tank.
[0005]
[Problems to be solved by the invention]
Here, since the work of spanning the roof 6 is usually performed in the second half of the whole process, the construction work of the bottom plate 3 and the side wall 4 is naturally performed including the excavation work of the internal space 2 of the underground continuous wall 1. Work outdoors.
[0006]
As a result, the harsh working environment under hot weather may lead to a decrease in work efficiency or a significant delay in the process due to bad weather such as rain or snowfall. It was essential to do.
[0007]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a construction method of an underground structure that can avoid the influence of the weather as much as possible and can rationalize the construction.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the underground structure construction method according to the present invention constructs an underground continuous wall as described in claim 1, and constructs an underground structure inside the underground continuous wall. A method for constructing an underground structure, wherein after the underground continuous wall is constructed, a roof is bridged in the vicinity of the top of the underground continuous wall to cover the inside upper side of the underground continuous wall. In the construction method of the underground structure in which the structure of the underground structure is constructed in the excavation space surrounded by the underground continuous wall,
When spanning the roof, a reinforcing body is preliminarily constructed in the form of being interconnected to the underground continuous wall at the top outer periphery of the underground continuous wall, and the edges constituting the periphery of the roof are formed on the ground. Pre-constructed at the top of the middle continuous wall and the reinforcing body, and then spans the top of the underground continuous wall so that the roof is connected to the edge,
When constructing the housing, the bottom plate constituting the housing is constructed at the bottom of the excavation space, the side walls constituting the housing are erected upward from the bottom plate, and the top end of the side wall is It is integrated with the edge.
Moreover, the construction method of the underground structure according to the present invention is as described in claim 2, wherein the underground continuous wall is constructed, and the underground structure is constructed inside the underground continuous wall. After constructing the underground continuous wall, a roof is installed near the top of the underground continuous wall to cover the inside upper side of the underground continuous wall, and then the underground continuous wall is used. In the construction method of the underground structure that constructs the frame of the underground structure in the enclosed excavation space,
When spanning the roof, a predetermined reinforcing body is preliminarily provided at a position on the inner side of the top of the underground continuous wall and at the top of the side wall constituting the housing and interconnected to the underground continuous wall. Build and span the top of the underground continuous wall so that the roof is connected to the reinforcement,
When constructing the frame, the bottom plate constituting the frame is constructed at the bottom of the excavation space, and the side wall is erected upward from the bottom plate to be integrated with the reinforcement. The body is the top of the side wall.
[0009]
Moreover, the construction method of the underground structure which concerns on this invention performs the excavation operation | work of the area | region enclosed by the said underground continuous wall after spanning of the said roof.
[0012]
In the underground structure building method according to the present invention, after building the underground continuous wall, first, a roof is bridged near the top of the underground continuous wall to cover the upper inside of the underground continuous wall. Next, the underground structure frame is constructed in the excavation space surrounded by the underground continuous wall.
[0013]
In this way, in the underground construction of the underground structure, it is possible to block rain, snowfall or direct sunlight in the excavation space by the roof that was previously constructed, and it is possible to proceed with the construction in all-weather conditions. Become.
[0014]
It is optional whether the excavation work in the area surrounded by the underground continuous wall is performed before or after the roof is bridged. However, if the excavation work is performed after the roof is bridged, the excavation work is performed. Can be done in all weather, and it is possible to carry out the work of building the roof by using a roof construction scaffold standing on the ground, and avoiding the work of building the roof to work at a high place. Can do.
[0015]
In addition, when the roof is built, a reinforcing body is preliminarily constructed in the form of being interconnected to the underground continuous wall at the top outer periphery of the underground continuous wall, and the edges constituting the periphery of the roof are Pre-constructed at the top of the continuous wall and the reinforcement body, and then over the top of the underground continuous wall so that the roof is connected to the edge, when excavating the bottom plate that constitutes the frame when constructing the frame When constructing at the bottom in the space, standing up the side wall constituting the frame from the bottom plate upwards, and integrating the top end of the side wall with the edge, when supporting the roof weight, It can be a reinforcement for supporting the weight of heavy equipment installed near the outside of the underground continuous wall.
[0016]
In addition, when the roof is built, a predetermined reinforcing body is built in advance at a position inside the top of the underground continuous wall and at the top of the side wall constituting the frame and interconnected to the underground continuous wall. When constructing the frame so that the roof is connected to the reinforcement body, the bottom plate constituting the frame is constructed at the bottom of the excavation space, and the side wall is directed upward from the bottom plate. If it stands up and it is made to integrate with a reinforcement body, it can be set as reinforcement at the time of supporting a roof weight.
In addition, it is not necessary to remove the reinforcing body after the housing construction is completed, and the reinforcing body can be effectively used as a part of the housing.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a construction method of an underground structure according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.
[0018]
FIG. 1 is a flowchart showing the procedure of the underground structure construction method according to the present embodiment. As can be seen from the figure, in the construction method of the present embodiment, first, the underground continuous wall 1 similar to that described in the prior art is constructed in a cylindrical shape (step 101).
[0019]
Next, as shown in FIG. 2 (a), a headband-shaped reinforcing body 11 is constructed as an RC structure in the form of being interconnected to the underground continuous wall on the outer periphery of the top of the underground continuous wall 1 (step 102). . In addition, connecting reinforcing bars 12 and 13 are embedded in advance at the top ends of the underground continuous wall 1 and the reinforcing body 11.
[0020]
Next, as shown in FIG.2 (b), the edge part 14 which comprises the circumference | surroundings of the roof 6 is constructed | assembled in the ceiling of the underground continuous wall 1 and the reinforcement body 11 (step 103). At this time, the reinforcing bar 16 for integrating with the side wall 4 of the underground structure is projected downward.
[0021]
Next, as shown in FIG. 3, the inside of the underground continuous wall 1 is slightly dug as necessary, and the roof construction scaffold 21 is assembled on the ground surface 22 (step 104).
[0022]
Next, by connecting the roof 6 to the edge portion 14, the roof is bridged to the top of the underground continuous wall 1, and the upper inside of the underground continuous wall 1 is covered (step 105).
[0023]
Next, the roof building scaffold 21 is dismantled after the curing period of the roof 6, and then the area surrounded by the underground continuous wall 1 is dug down as shown in FIG. 4 (step 106). The excavated earth and sand are carried out to the ground through a temporary opening 31 for carrying in and out formed on the roof 6.
[0024]
Next, as shown in FIG. 5, bottom plates 41, 42, 43, and 44 are sequentially applied to the bottom of the excavated space 2, and subsequently, the cylindrical side wall 4 is moved forward from the bottom plate 43, that is, upwardly. Standing up (step 107).
[0025]
The side walls 4 are preferably constructed in units of lots having a height of several meters. Moreover, what is necessary is just to carry in / out through the temporary opening 31 for carrying in / out about the material required for the bottom plates 41-44 and the side wall 4, or the material which became unnecessary.
[0026]
Next, the top end of the side wall 4 is integrated with the edge portion 14 described with reference to FIG. 3, and the construction of the side wall 4 is completed (step 108). The carry-in / out temporary opening 31 is closed at an appropriate time in consideration of processes such as internal equipment work such as cold insulation work.
[0027]
As explained above, according to the construction method of the underground structure according to the present embodiment, it becomes possible to block rain, snowfall or direct sunlight to the excavation space 2 by the roof 6 that has been previously constructed, The construction of laying 44 and the construction of raising the side wall 4 can be carried out in so-called all weather.
[0028]
Further, according to the present embodiment, the excavation work is performed after the roof 6 is bridged, so that the work of excavating the area surrounded by the underground continuous wall 1 can be performed in all weather, and the roof 6 Can be performed using the roof construction scaffold 21 erected on the ground, and it is possible to avoid the roof from being a high place work.
[0029]
Further, according to the present embodiment, the reinforcing body 11 is constructed at the top of the underground continuous wall 1 so as to be interconnected to the underground continuous wall, and the roof 6 is connected to the underground continuous wall via the edge 14. 1 and the reinforcing body 11, it is reinforced when supporting the weight of the roof 6, and the horizontal rigidity of the top of the underground continuous wall 1 is increased. Even when the heavy machine 32 is installed near the outside of the wall 1, the weight of the heavy machine can be sufficiently supported.
[0030]
In this embodiment, the excavation work is performed after the roof 6 is bridged. However, if it is not necessary to perform the excavation work in all weather, the excavation work in the region surrounded by the underground continuous wall is performed on the roof. You can go before handing over.
[0031]
As a method for bridging the roof in such a configuration, for example, after excavation is completed, the roof 6 is assembled at the bottom of the excavation space surrounded by the underground continuous wall 1, and then the roof 6 is, for example, the top of the underground continuous wall. It is preferable to lift up while taking the reaction force with the reaction force stand provided on the head and connect it to the edge portion 14. The time for assembling the roof 6 may be before the bottom plates 41 to 44 are constructed or after the construction.
[0032]
In this embodiment, the headband-shaped reinforcing body 11 is constructed in advance, and the edge portion 14 of the roof 6 is constructed on the reinforcing body and the underground continuous wall 1, but there is no problem in strength. If present, the reinforcing body 11 may be omitted and the edge 14 of the roof 6 may be connected only to the underground continuous wall 1.
[0033]
Moreover, in this embodiment, although the reinforcement body 11 was constructed | assembled in the outer periphery of the underground continuous wall 1, instead of this, as shown in FIG. You may make it build. In such a configuration, if the reinforcing body 51 is constructed at a position to be the topmost portion of the side wall 4, the reinforcing body 51 will constitute the topmost portion of the side wall 4 after the housing construction is completed, and the reinforcing body is removed. There is no need to do this, and it can be used effectively as part of the housing.
[0034]
Even in such a configuration, as in steps 104 to 105 described in the above embodiment, the inside of the underground continuous wall 1 is slightly dug as necessary, and the roof construction scaffold 21 is assembled on the ground 22. Later, the roof 6 may be connected to the reinforcing body 51 and spanned near the top of the underground continuous wall 1 so as to cover the upper inside of the underground continuous wall 1.
[0035]
【The invention's effect】
As described above, according to the construction method of the underground structure according to the present invention, it is possible to block rain, snowfall or direct sunlight into the excavation space by the previously constructed roof, and the construction of laying the bottom plate and The construction for raising the side walls can be carried out in so-called all weather.
In particular, according to the construction method of the underground structure of the present invention according to claim 1, it becomes reinforcement when supporting the weight of the roof, and the horizontal rigidity of the top of the underground continuous wall increases. Even when a heavy machine is installed near the outside of the continuous wall, there is also an effect that the weight of the heavy machine can be sufficiently supported.
Moreover, according to the construction method of the underground structure of this invention which concerns on Claim 2, while it becomes the reinforcement at the time of supporting the weight of a roof, it becomes unnecessary to remove a reinforcement body, and it uses effectively as a part of a housing There is also an effect that it is possible to do.
[0036]
Further, according to the construction method of the underground structure of the present invention according to claim 3, the work of excavating the area surrounded by the underground continuous wall can be performed in all weather, and the work of spanning the roof, It is possible to carry out using the roof construction scaffold standing on the ground, and it is possible to avoid the work of overhanging the roof as a work at a high place.
[0039]
[Brief description of the drawings]
FIG. 1 is a flowchart showing a procedure of a construction method of an underground structure according to the present embodiment.
FIG. 2 is a diagram showing a construction procedure of a construction method for an underground structure according to the present embodiment, in which (a) shows a state in which a reinforcing body 11 is constructed in the vicinity of the underground continuous wall 1; These are the figures which showed a mode that the edge part 14 of the roof 6 was constructed | assembled on the underground continuous wall 1 and the reinforcement body 11, respectively.
FIG. 3 is a diagram showing a construction procedure of the underground structure building method according to the present embodiment, and shows a state in which a roof building scaffold 21 is assembled on the ground surface 22 inside the underground continuous wall 1; Figure.
FIG. 4 is a diagram showing a construction procedure of the underground structure building method according to the present embodiment, and excavating a region surrounded by the underground continuous wall 1 after the roof 6 is bridged. The figure which showed a mode.
FIG. 5 is a diagram showing the construction procedure of the underground structure construction method according to the present embodiment, and constructing the underground structure frame, that is, bottom plates 41 to 44 in the excavated space 2; The figure which showed a mode that the side wall 4 was standingly arranged from the bottom plate 43 by the forward winding.
FIG. 6 is a view showing a construction method of an underground structure according to a modified example, and shows a state in which a reinforcing body 51 that is a part of a side wall 4 is preliminarily constructed inside the underground continuous wall 1;
FIG. 7 is a longitudinal sectional view showing a conventional LNG tank which is an underground structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground continuous wall 4 Side wall 6 Roof 11 Reinforcement body 14 Edge (roof)
21. Scaffolds for roof construction 41-44 Bottom plate (frame of underground structure)
51 Reinforcing body (Body of underground structure, side wall)

Claims (3)

An underground structure construction method for constructing an underground continuous wall and constructing an underground structure inside the underground continuous wall, wherein after the underground continuous wall is constructed, the top of the underground continuous wall Construction of an underground structure that covers a roof in the vicinity and covers the upper inside of the underground continuous wall, and then constructs the structure of the underground structure in an excavation space surrounded by the underground continuous wall In the method
When spanning the roof, a reinforcing body is preliminarily constructed in the form of being interconnected to the underground continuous wall at the top outer periphery of the underground continuous wall, and the edges constituting the periphery of the roof are formed on the ground. Pre-constructed at the top of the middle continuous wall and the reinforcing body, and then spans the top of the underground continuous wall so that the roof is connected to the edge,
When constructing the housing, the bottom plate constituting the housing is constructed at the bottom of the excavation space, the side walls constituting the housing are erected upward from the bottom plate, and the top end of the side wall is A construction method of an underground structure characterized by being integrated with an edge. An underground structure construction method for constructing an underground continuous wall and constructing an underground structure inside the underground continuous wall, wherein after the underground continuous wall is constructed, the top of the underground continuous wall Construction of an underground structure that covers a roof in the vicinity and covers the upper inside of the underground continuous wall, and then constructs the structure of the underground structure in an excavation space surrounded by the underground continuous wall In the method
When spanning the roof, a predetermined reinforcing body is preliminarily provided at a position on the inner side of the top of the underground continuous wall and at the top of the side wall constituting the housing and interconnected to the underground continuous wall. Build and span the top of the underground continuous wall so that the roof is connected to the reinforcement,
When constructing the frame, the bottom plate constituting the frame is constructed at the bottom of the excavation space, and the side wall is erected upward from the bottom plate to be integrated with the reinforcement. A construction method of an underground structure, characterized in that a body is the top of the side wall.   The construction method of the underground structure of Claim 1 or 2 which performs the excavation operation | work of the area | region enclosed by the said underground continuous wall after the bridging of the said roof.

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