KR0179708B1 - Working method for underground structure of a building - Google Patents

Abstract

The present invention allows the construction of core structures through the core openings of the stratum slabs, while easily laying out the stratum slabs with core openings in the center to facilitate the gulting work. Regarding the technical configuration of the present invention, the underground continuous wall 10 is installed around the outer periphery of the underground construction area, and the supporting pillars 20 are installed upright, and the underground continuous wall exposed by performing underground burial work. In constructing the underground structure part 100 by installing the stratified slabs 30 so that the 10 and the support pillars 20 are integrally connected, the stratified slabs 30 extend from the top close to the ground to the basement ground. When installed by reverse casting until, the core opening portion 40 which is drilled to penetrate vertically through the central portion of each stratum slab 30 to be poured is Installed to be seen, used as a passage for carrying out the soil excavated during the excavation work in the bottom of the stratified slab 30, and after installing the stratified slabs 30, the core openings 40 of each stratified slab core structure (200) It is to be used as a space for construction.

Description

Construction method of underground structure part of building

1 is a view illustrating a state of construction of a conventional underground structure

2 is a plan view illustrating an underground structure of the present invention.

Figure 3 is a cross-sectional side view illustrating the underground structure of the present invention.

Figure 4 (a) (b) (c) (d) shows the step-by-step process according to the construction of the underground structure of the present invention.

Figure 5 shows an embodiment of installing the present invention ground slab.

* Explanation of symbols for main parts of the drawings

10: underground continuous wall 20: support pillar

20a: pillar foundation 30: stratified slab

40: core opening 59: discarded concrete

(Industrial use)

The present invention is for constructing the underground structure accompanying the building construction, and in particular, the core through the core opening in the center of each slab slabs to facilitate the excavation work, while the core through the core openings of the slabs It relates to the construction method of the underground structure of the building that allows the construction of the structure.

Previously, the installation temporary construction earthwork method has been mainly adopted for the construction of underground structures of buildings, and the construction of underground construction parts by such constructional earthwork methods causes damage to surrounding buildings due to deformation and settlement of the ground layers, and installation of temporary earth walls. After the work was completed, the construction of the structure was carried out until the construction period was extended.

The top-down method, which has been recently developed to solve the problems described above and is used in the construction of underground structures of buildings, installs underground continuous walls and supporting columns before carrying out earthworks, It is possible to construct the underground structure part by repeating the installation work while repeating the installation work, and the construction of the ground structure part on the ground can be performed in parallel. It is known to have the advantage of being able to construct the maximum area of the basement floor by maximization of and to prevent collapse accidents that occur when excavation of the basement floor.

As shown in FIG. 1, in constructing the underground structure part of the building as a top-down method, a core structure part 2 for securing a space such as an elevator lift passage, a staircase room, a restroom, which is essential to the building, is constructed. Bar cores 2a are installed so as to be integrally connected with each stratified slab 1, which is back-cast in stages, and the core structure 2 passes through the center of the stratified slabs 1 to the top ground layer. It was possible to construct.

At this time, the core wall 2a, which is erected with each stratified slab 1, penetrates up and down and is blocked from side to side, and is difficult to be used as a space for carrying various equipment or materials during construction of the underground structure. Therefore, in order to carry out the excavation of the equipment or carry out the excavated soil to be carried out in the lower part of the stratified slab (1) which is back-poured step by step, it is necessary to secure an opening 3 separately in each stratified slab (1). There was a need.

Therefore, as well as the hassle of separately forming the openings 3 when installing each stratified slab 1, the opening 3 formed in each stratified slab is enclosed after the underground structure is completely constructed. It was a burden to carry out additional work.

In addition, the openings 3 formed in each stratified slab 1 are formed to be as small as possible in consideration of the subsequent encapsulation work, and are installed at positions deviated to one side on each stratified slab 1 due to the spatial arrangement. Therefore, it has been accompanied by problems such as the equipment for the excavation work or the work to take out the excavated earth and sand can not be performed smoothly.

On the other hand, Japanese Patent Laid-Open No. 63-312438 (December 20, 1988) installed a underground continuous wall for supporting piles on the outer periphery of an underground structure, built a supporting column, and then cut it by performing the first cutting work. Assemble slabs and formwork so that they can be elevated from floor to floor and between underground continuous walls, install the mounts as PC strands on formwork columns, and pull the formwork up to the ground level to connect it with the columns and columns. It is installed between the wall, the first floor and the concrete is laid on the formwork, and then the second excavation work is carried out, and the formwork is installed as the PC strand of the mount down to the ground floor of the first floor. A construction method for underground structures, which is to repeat the work of pouring concrete in the roof, has been proposed.

The construction method of such an underground structure is to freely elevate slabs and formwork installed after the bottom excavation work as a PC strand between the underground continuous walls and supporting pillars constructed in the ground, and to cast the slabs and beams, respectively. It is true that it has the advantage of shortening the construction period by efficiently performing the slab and beam installation work by excluding the complicated work process that requires the installation of site support for supporting the formwork whenever the beam is placed.

However, in carrying out the construction method of the conventional underground structure, the measures for bringing in equipment for excavation or excavation of excavated soil from the slab lowered in stages are not presented in detail. Whether the excavation work can be performed smoothly according to the construction of underground structures has resulted in opaque results.

In the case of forming a separate opening on each slab for gulting work, the problem of providing a separate opening on the slab and enclosing it later, and the opening formed separately in each interlayer slab is equipment or excavated earth and sand Due to the insufficient function as a passageway for smoothly carrying in and out of the building, there was no choice but to suffer from the problem that the efficiency of the excavation work due to the construction of the underground structure was reduced.

In addition, Japanese Patent Laid-Open No. 63-312439 (December 20, 1988) constructs a temporary underground continuous wall on the outer periphery of the location where the underground structure is to be constructed, and installs a pillar foundation to construct a steel column on the upper part. Next, the excavation work is carried out at the location of the underground wall, and the steel frame beams are laid horizontally and horizontally across the columns, and the beams and the columns are connected by bolts. Then, a ground construction method has been proposed in which an inner wall of an SRC structure is continuously formed inside a continuous wall, a text plate is laid on the complementary side, and concrete is placed thereon to form a bottom plate.

According to the ground construction method, after the excavation work is carried out in the underground continuous wall constructed underground, the steel structure beams are connected to the pillars, and the concrete plates are placed on the steel structure beams. By forming the plate, it is possible to efficiently perform the floor plate installation work by eliminating the complicated work process of assembling and installing the site support, thereby reducing the construction period for constructing the main structure. to be.

However, such ground structuring method also does not provide specific measures for carrying out equipment for excavation or excavation of excavated soil from the lower slabs that are backcast in stages. Whether it can be done smoothly has opaque results.

In case of forming a separate opening on each slab for gulting work, the problem of providing a separate opening on the slab and enclosing it later, and the opening formed separately in each interlayer slab is equipment or excavated earth and sand Due to the lack of function as a passage for smoothly carrying in and out, there was no choice but to suffer from the problem that the efficiency of the excavation work due to the construction of the underground structure was reduced.

[Purpose of invention]

The present invention is to ensure the core openings in the central portion on each stratified slab that is back-cast in stages in the underground continuous wall, so that during the construction of the first underground structure, it is possible to efficiently perform the excavation work through the core opening in the underground structure construction To improve the conditions of the excavation work and to provide the construction method of the underground structure of the building that allows the core structure construction to be efficiently carried out through the core opening secured to each stratified slab after the construction of the underground structure. have.

[Technical composition of the invention]

In the present invention, the underground continuous wall 10 is installed around the outer periphery of the basement construction area, and then the supporting pillars 20 are erected and installed, and the underground continuous wall 10 and the supporting pillars are exposed by performing underground excavation. The construction of the underground structure unit 100 by installing the stratified slabs 30 so that the 20 is integrally connected is the same as the conventional concept.

However, in the construction method of the underground structure of the building of the present invention, as shown in FIG. 2 and FIG. 4, when placing the ground slabs 30 from the top close to the ground surface to the basement base floor, Installed to secure the core opening 40 to be penetrated vertically through the central portion of each of the stratum slabs 30 to be used, and used as a passage for carrying out the soil excavated when the excavation work in the bottom stratum slab 30, After installing the stratum slabs 30 is characterized by the technical configuration that can be used as a space for the core structure portion 200 construction of the core opening portion 40 of each stratum slab.

Hereinafter, specific embodiments of the present invention will be described in detail for each process.

As shown in (a) of FIG. 4, the underground continuous wall 10 first stabilizes the strata by crawling a mixture of bentonite and cement along the perimeter of the underground structure, and then sets the strata as a constant width. It is to excavate to the ground layer vertically, insert the reinforcing structure into the excavated ground and pour the unhardened concrete.

As shown in (b) of FIG. 4, the support pillars 20 are embedded vertically in the ground by forcibly inserting the support pillars 20 so that the distal ends are positioned between the respective pillar foundations 20a installed in the ground layer. It is done.

The pillar foundations 20a are excavated to the ground layer by a well operation at the position where the support pillars 20 are to be installed along the inner periphery of the underground continuous wall 10, and then, after the reinforcing structure is inserted, the unreinforced concrete is poured. do. At this time, the pillar foundations 20a are installed in a set of a plurality, so that the interval is installed as about 1m.

As shown in (c) and (d) of FIG. 4, the stratified slab 30 is flat by performing excavation and stop work with the excavating equipment on the inner periphery of the inner continuous underground wall 10. After laying the formwork at the bottom of the pit, and connecting the underground continuous wall 10 and the support pillars 20 on the form of the slab reinforcement, the underground continuous wall 10 and the support pillars 20 are integrated It should be installed as much as possible.

While repeatedly performing the installation work of the ground slab 30 as described above, after the excavation step by step from the basement 1 floor close to the ground surface by installing each stratified slab 30 and installed to the basement basement floor.

And, when installing each of the stratified slabs 30, the core opening portion 40 is left so that the core structure 200, which is a dedicated space for elevator lift passages, stairs, toilets, etc. can be installed in the center of the stratified slabs 30. Leave unhardened concrete.

Thus, through the core opening 40 secured to the central portion of each stratified slab 30, the necessary equipment is required to carry out the excavation work of the lower portion of the stratified slab 30, as well as as the imported equipment. The earth and sand can be smoothly carried out through the core opening 40 of the stratum slab 30 again.

In addition, each stratified slab 30 is preferable to have a structural strength to be cast at a time, but it can be found that it can be constructed by partially blocking the joint if necessary.

Here, as shown in FIG. 5, when the ground slab 30 is excavated, the discarded concrete 50 is cast on the upper surface of the ground layer which is excavated with a clearance height of about 5 cm. It is preferable to allow each stratified slab 30 to be poured on its upper surface. The reason for this is to allow the formwork to be installed without placing the groundwork as a support when constructing the ground slab 30 which is backcast in stages.

In this way, after the installation of the ground slab 30 is completed and the underground structure 100 is constructed, the core wall 200a is opened through the core openings 40 of the respective ground slabs 30 from the basement ground as shown in FIG. ) Will be installed to connect the core structure 200 to the top of the building sequentially.

[Operation and Effects of the Invention]

In view of the above effects and effects of the present invention, the core openings are secured in the middle of the stratified slabs at the time of reverse placing each stratified slab in the underground continuous wall. It is possible to smoothly bring in the equipment necessary for carrying out the excavation work of the lower part of the stratified slab through the core opening, and at the same time, the earth and sand excavated as imported equipment can be efficiently taken out through the core opening of the stratified slab. When constructing underground structures, it has the effect of efficiently performing repetitive excavation work. Second, after constructing underground structures, through the core openings secured in each stratified slab, The core structure can be effectively constructed, and so on.

Claims (1)

After installing the continuous column 10 around the outer periphery of the basement construction area, the supporting pillars 20 are erected and installed, and the underground continuous wall 10 and the supporting pillars 20 are exposed by performing underground excavation. In constructing the underground structure part 100 by installing the stratified slabs 30 so as to be integrally connected, when each of the stratified slabs are installed by inverting from the top close to the ground to the basement ground, It is installed to secure the core opening 40 to be penetrated up and down in the central portion of the stratum slabs 30, and used as a passage for carrying out the soil to be excavated during the excavation work under the stratum slab 30, the stratum slab After the installation of the 30, the underground opening of the building, characterized in that to use the core openings 40 of each stratum slab as a space for the construction of the core structure (200) How grandfather construction.