JPH02266014A - Constructing underground structure eliminating use of temporary material - Google Patents

Abstract

PURPOSE:To construct an underground structure using almost no temporary materials and to contrive to reduce term of works and cost by constructing the structure with SC beams, PC boards or the like installed using landslide protection walls made of soil cement with H shape core materials dropped therein and frame center columns. CONSTITUTION:Landslide protection walls 1 made of soil cement 2 and 5 with H shape steel core materials 3 dropped therein and with the lower ends of the required core materials 3 reached bearing subsoil 4 and frame center columns 7 that are positioned at common centers C of an underground structure are installed. Then the ground 8 is excavated to a depth bearable for construction of floor framing for an aboveground story, and SC beams 10 incorporating steels are installed between the wall 1 and the columns 7 and between each of the columns 7, and PC boards 11 are installed thereon. Slab concrete 12 is then placed thereon and beams 13 and columns 14, doubling as wales, are further placed. By repeating the above-mentioned processes, the underground structure is constructed by advancing works in series toward the lower stories with employment of reverse casting method. Normal casting method in which works are advanced in series toward the upper stories may be employed.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a construction method for constructing an underground structure of a building by constructing a retaining wall using a series of soil pillars using the forward pouring method or the reverse pouring method. , Zara-Ni-e relates to a construction method for underground structures that requires almost no temporary materials such as sills for retaining the piles and sills.

Conventional technology ■ Conventionally, when constructing an underground structure for a building, the
A retaining wall is temporarily installed around the outer periphery of the underground structure, and as the ground excavation progresses, upholstery materials and struts are added.
llff1 Next, the mountain retaining construction method is being implemented to stiffen the retaining wall. Therefore, the reality is that a considerable amount of temporary shrines are required, and a considerable amount of construction time is consumed for temporary construction.

■ In this regard, for example, Japanese Patent Application Laid-Open No. 1983-3-2 4-7 4 aimed at reducing the cost of temporary construction for mountain retaining work.
In the case of the method for constructing an underground structure described in Publication No. 2-3, a method is disclosed in which an expensive underground continuous wall is used as the base S<part of the underground structure.

■In addition, ■] A method of using soil columns with steel as a core material as part of the underground outer wall is also conventionally known.

Problems to be solved by the present invention (1) As mentioned above, the cost of retaining the piles in the construction cost, for example, the construction of soil columns with H steel as the core material, the construction of struts, etc.
The cost of so-called temporary shrines for temporarily erecting or removing Haraoki-shrines is quite large. However, these temporary materials are only needed when constructing the underground structure, and when the heap retaining work is completed (no longer needed), the soil column rows are buried, and the struts and upholstery materials are replaced. must be completely removed. In short, the waste of temporary construction materials is immeasurable, and dangerous work is forced when dismantling the beams and haragorishi shrines, creating a double or triple inconvenience that has become a major problem.

(2) On this point, JP-A-63-2-4 mentioned in 1.
, 7 4. 2 As in the construction method described in Publication No. 3, an underground continuous wall can be used as the foundation of an underground structure, or as described in 1. This construction method can be highly evaluated as an improved proposal for reducing wasted temporary construction materials.

However, the former is a construction method that assumes an expensive underground continuous wall that is only used when constructing large-scale high-rise or super-high-rise buildings, and there is no possibility of its application to small- to medium-sized and low-rise buildings. be equivalent to. In hindsight, this is a construction method that is used for medium- and low-rise buildings, but even in the former case, the need for sills and harakori shrines has not yet been eliminated; Since the waste related to the tummy tuck 14 has not been resolved, there are still issues to be solved.

Means for Solving the Problems (First Invention) As a means for solving the problems of the prior art described in 1., the construction method of underground structures omitting temporary materials according to the first invention is, so to speak, the opposite. This method belongs to the pouring construction method, and as the preferred embodiments are shown in Figures 1 to 7 of the drawings, it is a construction method in which a retaining wall is constructed, the ground is excavated, and an underground structure is constructed there. A) The retaining wall 1 is formed by dropping the 11 steel core material 3 into the soil cement 2, and the lower ends of the IJ steel core materials at key positions are formed by rows of soil columns that reach the support layer 4. In addition, at the position of the pillar in the center C of the underground structure, a structural pillar 7 is also installed in which the copper core shrine 6 is dropped into the soil cement 5 and its lower end reaches the support layer 4. The step of excavating the ground 8 to a depth that does not interfere with the construction of the ground floor floor structure, and c) exposing the retaining walls 1 and ■1 steel core materials 3 and 6 of the structural pillars 7. , permanent installation 1 between the H steel core members 6 and 6 between the structural pillars, and between the H copper cores 3.60 of the structural pillars 7 and the retaining walls 1, respectively.
Precast conch U-1-beam 1 with built-in 9ζ bone 9
The precast concrete beams 1010 are placed on top of the precast concrete beams 1010 constructed in this way.
・Erect and lay the slabs 11, place the cast-in-place slab concrete 12 on top of it, and install the beams] 3 which also serve as raising materials along the retaining wall 1, and set the position of the structural pillars 7. 2) Further, the excavation of the ground 8 is continued to a depth that allows the construction of the first basement floor, and the step 3) is carried out. It is characterized by comprising the following steps of repeating the same steps.

Function: The retaining wall 1 formed by the row of soil pillars prevents the collapse of the ground 8 while excavating the ground 8 to a depth (approximately 2 to 3 nm) that does not interfere with the construction of the second floor floor. Demonstrates strength and rigidity to prevent damage.

The retaining wall 1 and the structure pillar 7 are made of soil cement 2,
By renting out 5, the inside H&li1. E: Shrine 3.
6 can be easily exposed as much as necessary (or as much as necessary).

■] steel core material 3.6 and 6°60 thus exposed
This SCClO
In addition to functioning as a strut to support the double retaining wall 1 from the inside,
It is considered to be the permanent beam.

The slab concrete 120 (hereinafter abbreviated as 20th edition) 11 can also be used as a substitute for the slab concrete 120 floor formwork.

The beam 13 cast along the inside of the retaining wall 1 also serves as a raised member that supports the retaining wall 1 from the inside.

In addition, at the position of the structural pillar 7, a permanent steel-reinforced concrete column 14 having the H steel core material 6 as a reinforcing steel frame is cast.

The vertical load of the ground floor floor assembly completed as described above is the H steel core material 3 of the retaining wall 1 and the structural pillar 7.

6 and is transmitted to the support layer 4 and supported.

In this way, after the floor assembly for the ground floor is completed, it becomes possible to excavate the ground 8 roughly and deeply for the retaining wall 1 reinforced with SCClO2, and the excavation is continued to a depth where the floor assembly for the first basement floor can be constructed. , you can proceed with the construction of the first basement floor.

(Second invention) Similarly, as a means of solving the problem of the technology mentioned in Section 2, 1, the method of constructing an underground structure omitting temporary materials according to the second invention belongs to the so-called sequential construction method. In the construction method of excavating the ground and constructing an underground structure there, a) The retaining wall 1 is constructed by dropping 11 steel core material 3 into soil cement 2, and The lower ends of the IJ steel cores at strategic locations are formed by rows of soil columns that reach the support layer 4. In addition, at the position of the column in the center C of the underground structure, there is also a structure column 7 with a steel core 6 dropped into the soil cement 5 and its lower end reaching the support N4. (1) Excavation of the ground 8 to a depth that does not interfere with the construction of the ground floor floor structure, and (3) The step of installing the H-framework members 3 and 6 of the retaining walls 1 and the structural pillars 7. Between the H steel core members 6 and 6 of the structural pillars 7,
And IJ steel copper core 3.6 of each of structural pillar 7 and retaining wall 1
2) A step of constructing a beam 13 which also serves as an upright material along the retaining wall 1, and 2) further excavating the ground to assemble the floor of the first basement floor. Proceed to a depth that allows for construction, perform the process in c) above, repeat the same process to complete the excavation of the ground until the lowest level; PC board 11 was erected on top of the SC beam] 0. Cast-in-place slab concrete 1 and 12 were placed on the beam, and the structure exterior wall 5 was placed on the retaining wall 1, and , repeating the process of placing the main pillar J4 at the position of the structural pillar 7 by pouring concrete on site, respectively.

Function retaining wall 1, structural pillar 7, and their IJ steel core paulownia 3.6
The functions of SCCl2O installed between the two are the same as those in the first invention.

In the case of the present invention, excavation of the ground 8 is carried out in advance to the lowest layer while the SCCl2O strut is working,
It is characterized by a sequential pouring method in which the concrete slabs 12 are poured, the main pillars 14 and the outer walls 15 of the structure are poured, etc., from the lowest floor to the upper floors.

Example The illustrated invention will now be described in detail.

First of all, Figure 1 shows soil cement formed by drilling and stirring while injecting cloud with ocher into the underground outer wall of the underground structure to be constructed.・H for permanent installation in 2
A retaining wall 1 is installed with a row of soil columns into which the steel core material 3 is dropped, and a H1 core for permanent installation is installed in the soil cement 5 at the opposite center C of the column and beam in the underground structure. It shows the planar arrangement at the stage where the structural pillar 7 formed by dropping +A6 is installed. As shown in FIG. 3, the H steel core materials 3 and 6 of the retaining wall 1 and the structural pillar 7 are located at key positions, and their lower ends reach the support layer 4, and the IJ steel core materials 3
, 6, a pressure-resistant steel plate 16 is attached by welding or bolting to the lower end portions to increase the supporting force at the tip.

The copper core shrines 3 and 6 are embedded piles that do not need to be struck. Therefore, in the vicinity of the support layer of the soil cement 2 and 5 of the retaining wall 1 and the structure pillar 7, the water-cement ratio is 50.
The foot hardening part 17 is formed using a root hardening solution with a concentration of ~70%, thereby making it possible to transmit the vertical load (supporting force) borne by the H steel core material 3.6 to the support layer 4. has been done.

Figure 3 shows that the ground 8 surrounded by the retaining wall 1 is excavated to a depth (approximately 2 to 3 rn) that does not interfere with the construction of the floor structure for the second floor (ground floor), and the retaining wall 1 is The H copper cores 3 and 6 of the walls 1 and structural pillars 7 were exposed as necessary, and a permanent steel frame (H-shaped steel) 9 was built in between these Hfll cores 3 and 6 and between 6 and 6. This shows the stage where SCCl2O is bridged and bonded. FIG. 2 shows the planar arrangement of FIG.

SCCl2O, cassette attached to H steel core materials 3 and 6 by on-site welding! - The web of the permanent steel frame 9 is connected to the brake I-18 using high-strength bolts. For this reason, a cassette plate is provided. Note that as other means for constructing and joining SCCl2O, although not shown, 1-T I
The flange portions of the N core members 3 and 6 and the SCCl2O can also be tension-joined with high-strength bolts via 1-inch metal fittings.

Next, Figure 5 shows the SCC constructed as described in ``2''.
I) Erection C version 11 on top of l2O10 Cast-in-place slab concrete 'J-1.12 is placed on the beam, and at the same time, along the retaining wall 1, a reinforced concrete beam 13 that also serves as a raised material is installed. At the position of the structure pillar 7, there is a permanent pillar 14-
The reinforcing bars and formwork for pouring the slab concrete 2 are assembled, and the beams 13 and pillars 14 integrated with the slab concrete 2 are poured using cast-in-place concrete I. the result,
The weight of the floor assembly outside the ground floor and the vertical load loaded thereon are transmitted to and supported by the H steel core material 3.6 of the retaining wall 1 and the structural pillar 7. Transferring these loads safely and
In order to ensure reliability, shear connectors may be attached to the H steel core materials 3 and 6 in some cases.

FIG. 4 shows a plan layout of the PC plate 11 installed on SCCl2O.

Figure 6 shows that the excavation of the ground 8 has been carried out to a depth that allows the construction of the floor assembly on the first basement floor, and the retaining walls 1 and the 11 steel cores 3 and 6 of the structural pillars 7 have been exposed, and the IJ steel This shows the stage in which the main steel frame 9 is built between the core members 3 and 6 and between the core members 6 and 6, and the SCCl2O structure is installed and joined.

The PC version 11 is placed on top of the SC beam io and io constructed in this way.
A concrete slab 12 cast in the field is placed on the construction beam, and at the same time, a beam 1 is placed along the retaining wall 1, which also serves as an upright material.
3, and a formwork for pouring and pouring the main pillar 14- is assembled at the position of the structural pillar 7, and the beam 13 and the pillar 14, which are integral with the slab concrete 12, are made of cast-in-place concrete. It will be poured. Also, at this stage,
The outer wall formwork of the underground structure with the retaining wall 1 as the outer formwork and the reinforcing steel frame is also assembled, and the underground one floor is poured and constructed using the underground outer wall 15 or cast-in-place concrete 1.

FIG. 7 shows a plan layout of the beam 13, the outer wall 15 of the underground structure, and the main column 14 constructed by constructing one underground floor in this manner. In this way, the underground structures are constructed one after another, facing downwards, using the so-called reverse construction method.

Other Embodiments By the way, as a different embodiment of the present invention, a so-called pour-in construction method is also possible. Although it has been omitted from illustration and explanation, when implementing the sequential casting method, SCCl2O is installed on the H41 core materials 3 and 6 of the retaining wall 1 and the structural pillar 7 on each floor, and along the inside of the retaining wall 1. Beam 13 that also serves as a material for raising the stomach
The excavation of ground 8 for the newly constructed frame is proceeding steadily. Then, at the stage when the construction to the lowest level is achieved, the construction of the underground structure proceeds from the lowest level to the upper floors. That is, as mentioned above, the PC plate 11 is placed on top of the SC beam 1 sail 10 that has already been erected, and the cast-in-place slab concrete 1 and 12 are placed on the erected beam, and at the same time, the slab concrete 1 and 12 are placed at the position of the structure pillar 7. Assemble the reinforcing bars and formwork for pouring and pouring the main pillars 14, and install the slab concrete.
Column 14, which is integral with 1 and 12, is cast with cast-in-place concrete.

Furthermore, at this stage, the reinforcing bars and formwork for the underground structure's outer wall are assembled inside the retaining wall 1, and the underground outer wall 15 is poured one floor at a time using cast-in-place concrete, and construction progresses sequentially to the upper floors. be.

The effects of the present invention are described in detail in the following examples and examples.
The construction method of underground structures that omit temporary materials according to the present invention does not use stubs or raised materials as temporary materials, so it is possible to completely reduce the volume of temporary materials and construction work required for temporary construction. It is possible to achieve a significant reduction in cost I and the amount of balls.

[Brief explanation of drawings]

Figure 1 is a plan view showing the construction status of retaining walls and structural pillars using soil column rows, Figure 2 is a plan view of Figure 3, and Figure 3 is a diagram showing the construction status of the SC beams on the ground floor. Figure 4 is a plan view showing the construction status of I)C version, Figure 5 is an elevation view showing the completed slab concrete construction of the ground floor, and Figure 6 is the basement floor. FIG. 7 is an elevational view of a portion of the underground structure with the SC beams installed, and a plan view of the underground structure. 1... Mountain retaining wall 3.6... H steel core material 4... Support layer 8... Ground 10... SC beam 12... Slab concrete 13... Beam 15... Outer wall 2.5 ... Soil cement C ... Reverse core 7 ... Structural pillar 9 ... Steel frame 11 ... PC version note 14 ... Column

Claims (1)

[Claims] [1] A construction method in which a retaining wall is constructed, the ground is excavated, and an underground structure is constructed there: (a) The retaining wall is constructed by dropping an H steel core material into soil cement. , and the lower ends of the H-steel cores at strategic locations are formed by rows of soil columns that reach the support layer, and the H-steel cores are placed in the soil cement at the locations of the columns in the center of the underground structure. (b) excavating the ground to a depth that does not interfere with the construction of the ground floor floor; and (c) retaining wall. The H steel core materials of the structural pillars are exposed, and precast concrete beams with built-in steel frames are installed between the H steel core materials of the structural pillars and between the H steel core materials of the structural pillars and the retaining walls. A precast concrete slab was then erected on top of the precast concrete beams, and cast-in-place slab concrete was placed on top of the precast concrete beams.
In addition, a beam that also serves as a raising material will be placed along the retaining wall, and a permanent pillar will be placed at the position of the main pillar using cast-in-place concrete. A method for constructing an underground structure omitting temporary materials, characterized by the following steps: advancing the floor assembly to a depth that allows construction, performing the process of c) above, and repeating the same process thereafter. [2] In the construction method in which a retaining wall is constructed, the ground is excavated, and an underground structure is constructed there. The lower end of the H-steel core material is formed by a row of soil columns that reach the support layer, and the H-steel core material is dropped into soil cement at the position of the column in the center of the underground structure. The stage of installing the structural pillars with their lower ends reaching the supporting layer; b) The stage of excavating the ground to a depth that does not interfere with the construction of the ground floor floor; and c) The H of the retaining walls and structural pillars. The steel core material is exposed, and precast concrete beams with a built-in steel frame are installed between the H steel core materials of each structure pillar and between the structure pillars and the retaining wall to connect them, and the retaining wall is installed. d) Excavation of the ground is carried out to a depth that allows construction of the floor structure for the first basement floor, and step 3) is carried out, and the same process is repeated thereafter. (e) Erection of a precast concrete slab on top of the precast concrete beams erected in the above process, starting from the lowest floor and working its way up to the upper floors; The method is characterized by the following steps: pouring slab concrete, placing the outer wall of the structure in the retaining wall area, and placing permanent columns in the positions of the structural pillars with cast-in-place concrete. , a construction method for underground structures that eliminates temporary materials.