JPH09111783A - Constructing method of underground building frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a term of work by constructing a floor by providing PC beams and floor slabs in the horizontal direction in a basement space so that they support earth retaining walls, and by removing shore strut supports in the vicinity of positions where the floor slabs are provided. SOLUTION: A foundation structure part 6 is constructed on the ground inside a basement obtained by repeating alternately erection of shore strut supports supporting earth retaining walls 1 and excavation of an area inside the earth retaining walls 1. Next, iron frame pillars 7a-7f are erected from the foundation structure part 6, PC beams 8a-8g are fitted between the iron frame pillars 7a-7f and the earth retaining walls 1 and floor slabs 9 are provided on the PC beams 8a-8g. Prior to floor construction of the second basement, subsequently, the shore strut supports 5d are disjointed and removed and the floor of the third basement supports the earth retaining walls 1 in place of the shore strut supports 5d. An underground building frame is constructed by repeating the process of the floor construction and the process of removing the shore strut supports and the removal of the shore strut supports is enabled immediately after completion of the erection of the PC members. Accordingly, a term of work can be shortened greatly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an SRC underground structure, for example.

[0002]

Generally, the SRC underground structure is constructed by a progressive driving method in which the underground structure of each floor is sequentially constructed from the lowermost floor portion in the underground space surrounded by the mountain retaining wall. That is, after the construction of the foundation portion is completed, the beam support supporting the mountain stop wall is dismantled and removed in the vicinity thereof, and the vertical member (wall) is notched while the beam support above it is left. The construction of the upper building is done. After that, the same process is repeated, and after the strength of the skeleton is developed, the reaction force of the mountain stop wall is transferred to the skeleton, and the beam support is dismantled and removed.

However, such a sequential driving method has the following problems. That is, the horizontal members (beams, floors, etc.) that support the retaining wall instead of the dismantling and removal of the girder support work are made of cast-in-place concrete, so until the strength develops. Can not dismantle the beam support. Therefore, the construction of the upper floor above the floor where the horizontal member is provided must wait for the cast concrete to harden, which prolongs the construction period.

Further, it is troublesome to close the notch provided for dismantling and removing the beam support work, and especially at the outer wall portion, a great deal of labor is required to completely prevent water leakage. Is difficult to shorten. The present invention has been made to solve these problems, and an object of the present invention is to provide a method for constructing an underground skeleton with excellent workability that can significantly shorten the construction period.

[0005]

The above object of the present invention is to provide an underground space which is obtained by alternately repeating the construction of a girder support for supporting a cliff wall and the excavation of the area inside the cliff wall. It is a method to build an underground skeleton sequentially from the lower floor,
In the underground space, a C beam and / or an S beam and a floor slab are installed horizontally so as to support the mountain retaining wall,
A floor construction process for constructing a floor, and after the floor construction, the beam girder support work that disassembles the PC beam and / or S beam, and the beam girder support structure near the position where the floor slab is installed, and removes it from the underground space It is achieved by a method for constructing an underground skeleton, comprising a removing step, and repeating the floor constructing step and the truss support work removing step alternately as required.

[0006] In particular, a method of sequentially constructing an underground skeleton from the lowest floor portion in an underground space obtained by alternately erection of a girder support work for supporting a cliff wall and excavation of an area in the cliff wall alternately. That is, a basic structure part building process of building a basic structure part on the ground of the underground space, a steel column erection process of erection of a steel frame column on the basic structure part, and a erected steel frame column. Using a PC beam and / or an S beam and a floor slab in the underground space in a horizontal direction so as to support the mountain retaining wall, a floor building step of building a floor, and a PC after the floor building,
A beam and / or S beam, and a beam supporting structure removing process for dismantling the beam supporting structure near the position where the floor slab is installed and removing it from the underground space. This is achieved by a method of constructing an underground skeleton, which is characterized in that a supporting work removing process is alternately repeated as necessary.

Further, a method of constructing an underground skeleton sequentially from the lowest floor part in an underground space obtained by alternately repeating the construction of a girder support for supporting the mountain stop wall and the excavation of the area inside the mountain stop wall. That is, a basic structure part building process of building a basic structure part on the ground of the underground space, a steel column erection process of erection of a steel frame column on the basic structure part, and a erected steel frame column. Using a PC beam and / or S beam and a floor slab in the underground space in a horizontal direction so as to support the mountain retaining wall, a floor building step of building a floor, and a PC beam after the floor building And / or S beam, and the beam supporting structure for dismantling the beam supporting structure near the position where the slab is installed, and removing it from the underground space, and after removing the beam supporting structure, the underground frame A frame vertical part building step of building a vertical part of It is achieved by a method constructing underground building frame, wherein the alternately repeating as necessary and Engineering removal step and the frame vertical portion constructing step.

That is, according to the present invention, instead of cast-in-place concrete, a horizontal member such as a PC beam (or S beam) or a PC floor slab is used to construct the floor. Since the ground floor can immediately bear the earth pressure acting on the mountain retaining wall, it is possible to immediately remove the girder support work. Therefore, even if the floor is not completely completed, it is possible to immediately move to the construction on the upper floor, which significantly shortens the construction period. Moreover, the construction of the vertical member can be carried out immediately after the construction of the horizontal member is completed, and the work can be efficiently advanced in parallel with the construction of the floor.

In the method of constructing an underground skeleton, after constructing a floor on a certain floor, it is possible to construct a column wall by placing pillar concrete around a steel column located a plurality of floors below it. In this way, the construction period can be shortened by performing the construction of the horizontal member and the vertical member in parallel on different floors, that is, by constructing a plurality of floors at the same time. Moreover, for example, if a space for two floors is left, it is possible to obtain a high quality pillar wall without being affected by the vibration associated with the floor construction work.

The floor slab provided in contact with the steel column has notches corresponding to the cross section of the column wall constructed by placing column concrete around the steel column. It is preferable to send the concrete casting pipe to the lower floor by utilizing the notch. This eliminates the need to form a blind hole in the floor slab, and saves time and labor for closing the blind hole, which saves time and costs. Since the notch of the floor slab itself is closed by the column wall, no extra closing work is required.

[0011]

1 to 6 show an embodiment of a method for constructing an underground skeleton according to the present invention, and FIG. 1 is a sectional view showing a state in which the foundation structure has been completed, FIG. 3 is a plan view showing a state in which a PC beam and a floor slab are attached to a steel column, FIG.
4 is a cross-sectional view showing a state where the floor construction on the third basement floor is completed, FIG.
Is a cross-sectional view showing a state where the floor construction of the second basement floor is completed, FIG.
6 is a cross-sectional view showing a state where the floor construction of the first basement floor is completed, FIG. 6
[Fig. 3] is a cross-sectional view showing a state in which floor construction on the first floor above ground is substantially completed.

Hereinafter, the present invention will be specifically described with reference to FIGS. 1 to 6 by taking the case where the skeleton has a basement 4 floor structure as an example.
However, the present invention is not limited to this number of times, and the same construction can be performed for other floors. First, the earth retaining wall 1 is provided in the ground corresponding to the periphery of the area where the underground structure is constructed. Further, the gantry piles 2 for supporting the gantry for installing the heavy equipment are driven into a predetermined position, and further the shelving piles 3 for supporting the girder support work erected between the mountain retaining walls 1 at a predetermined height are provided at predetermined intervals. Drive into the ground.

Then, the gantry piles 2 are used to install the gantry bases 4a and 4b for installing the heavy equipment, and the shelving piles 3 are used to erection the cross beam support works 5a and 5b, and the digging machine is used to mount the cliffs. Start excavation of the area inside the wall 1. After the excavation of the first basement floor is completed, a beam support structure 5c will be installed, and further excavation of the second basement floor will be performed. Repeating this work, the beam support 5d, 5e
And the excavation of the 3rd and 4th basement floors will be completed. Then, excavation is further performed from the floor surface position on the fourth basement floor to a predetermined depth, and the foundation structure part 6 including a pressure plate and an underground beam is constructed on the ground of the underground space.

FIG. 1 shows a state in which the construction of the basic structure 6 is completed.
As shown in Fig. 1, the floor construction of the 3rd basement floor is performed after the strength is developed. However, in Fig. 1, only the girder support work 5e shown by the alternate long and short dash line is after the floor construction of the 3rd basement floor is completed. Dismantle and remove. This is because the space between the foundation structure 6 and the floor on the third basement floor is larger than the others. If this space is not so large, the beam support 5e is dismantled prior to the floor construction on the third basement floor. Can be removed.

Next, the steel columns 7a to 7 of the first section are arranged at predetermined intervals.
f is erected from the foundation structure part 6, and these steel frame columns 7a to 7
PC beam 8a suspended by a heavy machine between f and the mountain stop wall 1 ~
Attach 8g. Further, the floor slab 9 is installed on the PC beams 8a to 8g. FIG. 2 shows the arrangement of the PC beams 8a to 8g and the floor slab 9, for example, the state around the steel column 7a. As can be seen from FIG. 2, in the floor slab 9, the steel columns 7a-7
The thing provided in contact with f is formed with a notch 9a corresponding to the cross section of the column wall described later, and the concrete pouring pipe is sent to the lower floor from this notch 9a. The floor slabs provided on the first basement floor and the second basement floor also have similar cutouts.

Incidentally, in order to correct the surface irregularities, thin concrete is poured on the floor slab 9 after the other work is almost completed. The state in which the floor construction on the third basement floor is completed is as shown in FIG. 3. Prior to the floor construction on the second basement floor, the beam supporting structure 5d indicated by the alternate long and short dash line in FIG. 3 is dismantled and removed. As a result, the floor of the 3rd basement floor is replaced by the cliff wall 1 in place of the beam support 5d.
To support.

Next, the steel columns 7a to 7f and the mountain retaining wall 1
The PC beams 10a to 10g are attached between them, and the floor slab 11 is placed on the PC beams 10a to 10g. The state where the floor construction on the second basement floor has been completed is as shown in FIG. 4, and prior to the floor construction on the first basement floor, the girder support work indicated by the dashed line in FIG.
Dismantle and remove c. As a result, the floor of the second basement floor supports the cliff wall 1 in place of the beam supporting structure 5c.

Subsequently, the second-column steel-frame pillars 12a-12f are mounted on the first-column steel-frame pillars 7a-7f. Then, a PC beam 13 is provided between the steel columns 12a to 12f and the mountain stop wall 1.
a to 13g are attached, and the floor slab 14 is placed on the PC beams 13a to 13g. Part of the floor on the first floor above the ground will be constructed in parallel with this. That is, the steel column 12b-1 of Section 2
The PC beams 15a and 15b are attached between 2d, and the floor slab 16 is placed on the PC beams 15a and 15b.

The state where the floor construction on the first basement floor is completed is as shown in FIG. 5. Prior to the floor construction on the first floor above the ground, the beam supporting structure 5b indicated by the alternate long and short dash line in FIG. 5 is dismantled and removed. As a result, the floor of the first basement floor supports the cliff wall 1 in place of the beam supporting structure 5b. In addition, a pillar wall will be constructed on the 4th basement floor at the same time as the floor construction on the 1st basement floor. That is, underground 2
4 floors below, two floors below, after the first floor is constructed
On the floor, pillar concrete is placed near the mountain stop wall 1 and around the steel columns 7a to 7f of the first section, and the pillar wall 17a
Build ~ 17h. In this way, by separating only two floors, the pillar walls 17a to 17h to be constructed become less susceptible to the vibration when the lifter used for floor construction on the first basement floor travels on the floor on the second basement floor, A high quality pillar wall can be obtained.

Subsequently, the unnecessary gantry 4a is dismantled and removed, and the heavy equipment is transferred to the already constructed floor on the ground floor, and the gantry 4b is dismantled and removed. And the steel column 12d of Section 2
Install the PC beams 15c and 15d between ~ 12f, and
The floor slab 18 is arranged on the C beams 15c and 15d. The state where the floor construction on the first floor above ground is almost completed is as shown in FIG. 6, and as can be seen from FIG. 6, the pillar walls 19a to 19h are constructed on the third floor below the ground concurrently with the floor construction on the first floor above ground. To do. Then, on the second basement floor and the first basement floor, as in the fourth basement floor and the third basement floor, pillar concrete is placed to construct a pillar wall, and the underground structure is completed.

As described above, in the present invention, the PC member is laid horizontally to construct the floor. Therefore, after the erection is completed, the earth pressure acting on the retaining wall can be supported immediately. It is possible to remove the girder support work immediately. Therefore, as soon as the floor construction on a certain floor is completed, it is possible to immediately shift to the construction on the upper floor, and there is no inconvenience that work cannot be performed for a certain period of time, as in the case of constructing a floor by placing concrete. In addition, since the vertical pillar wall can be installed in parallel with the floor, the construction period can be greatly shortened.

[0022]

The method for constructing an underground skeleton of the present invention is excellent in workability and can significantly shorten the construction period.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which construction of a substructure is completed.

FIG. 2 is a plan view showing a state where a PC beam and a floor slab are attached to a steel frame column.

FIG. 3 is a cross-sectional view showing a state where floor construction on the third basement floor is completed.

FIG. 4 is a cross-sectional view showing a state where floor construction on the second basement floor is completed.

FIG. 5 is a cross-sectional view showing a state where floor construction on the first basement floor is completed.

FIG. 6 is a cross-sectional view showing a state where floor construction on the first floor above ground is substantially completed.

[Explanation of symbols]

 1 Mountain stop wall 5a-5e Girder support 6 Foundation structure part 7a-7f Section 1 steel column 8a-8g PC beam on the 3rd basement floor 9 Floor slab on the 3rd basement 9a Notch 10a-10g On the 2nd basement floor PC beam 11 B2 floor slab 12a-12f Section 1 steel columns 13a-13g B1 floor PC beam 14 B1 floor slab 15a-15d 1st floor PC beam 16,18 Ground 1st floor Floor slab 17a-17h Pillar wall on the 4th basement floor 19a-19h Pillar wall on the 3rd basement floor

Claims (4)

[Claims] 1. A method of sequentially constructing an underground skeleton from the lowest floor portion in an underground space obtained by alternately repeating the construction of a girder support for supporting a cliff wall and the excavation of the area inside the cliff wall. In the underground space, a PC beam and / or S beam, and a floor slab are installed horizontally to support the mountain retaining wall, and a floor is constructed to construct a floor, and after the floor construction, The method comprises the steps of dismantling the PC beam and / or S beam, and the beam support in the vicinity of the position where the floor slab is installed, and removing the beam support from the underground space. A method for constructing an underground skeleton, characterized by alternately repeating the beam supporting and removing process as necessary. 2. A method of constructing an underground skeleton sequentially from the lowest floor portion in an underground space obtained by alternately repeating the construction of a girder support work for supporting a cliff wall and the excavation of the area inside the cliff wall. The foundation structure part construction step of constructing a foundation structure part on the ground of the underground space, the steel frame pillar erection process of erection of a steel frame pillar on the foundation structure part, and the erected steel frame pillar Using the PC beam and / or S beam and the floor slab in the underground space in a horizontal direction so as to support the mountain retaining wall, and a floor building step of building a floor, and a PC beam after the floor building And / or S-beams, and a girder support work removing process of dismantling the girder support work near the position where the floor slab is installed, and removing it from the underground space. Construction of an underground skeleton characterized by alternately repeating the work removal process as needed Law. 3. A pillar wall is constructed by placing pillar concrete around a steel pillar located a plurality of floors below a floor after building a floor. How to build the underground structure. 4. A floor slab provided in contact with a steel column has a notch corresponding to the cross section of a column wall constructed by placing column concrete around the steel column. The method for constructing an underground skeleton according to any one of claims 1 to 3, wherein the concrete placing pipe is sent to the lower floor by utilizing the notch.