KR101106799B1 - Construction method of Top-down concrete slab - Google Patents

Abstract

The present invention relates to a method of constructing a top-down concrete slab, and more particularly, to a top-down construction method for constructing an underground structure while repeatedly laying a basement slab and an earth- A first step of installing a beam lowering frame and a single-layer beam frame and supporting the beam by a support, then installing and supporting the slab lowering frame and the slab frame by a support; A second step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and casting concrete to form a single-layer beam and a slab; After the concrete in the second step is cured, the support is disassembled and the trench construction is carried out to a depth of not more than one layer below the foundation, and the beam lowering frame is lowered by a lifting section to form a one- A third step of lowering the slab-lifting frame and the slab-lifting frame so that the slab-lifting frame and the slab-lifting frame are supported by a support; A fourth step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and placing concrete thereon to form a 1-story underground beam and a slab; And a step of forming the basement layer step by step by repeating the third and fourth steps up to the desired basement layer after the concrete in the fourth step is cured.

Beam, slab, lowering frame, mold, support, suspending member

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method of constructing a top-down concrete slab,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a top-down concrete slab, and more particularly, to a method of constructing a concrete slab of a top-down type, The present invention relates to a method of constructing a top down concrete slab in which a construction period and a construction cost can be reduced by allowing the continuous construction to be performed by moving the form to a lower layer.

In the construction of a building structure, a top-down construction method is applied in recent years. In general, as shown in FIG. 1, a top-down construction method generally includes a slurry wall (W) bored pile: P), and then constructing an underground structure while repeating the steps of the basement slab and earthworks from top to bottom, is shown in Fig.

This top-down method can be applied stably in the large-area, large-scale excavation that is difficult to plan by the existing open cut method, or in the urban area with many adjacent buildings. Since the first floor floor is caught, And it can be applied to rainfall and snowfall. It is widely used because it can expect the effect of shortening of air in buildings over a certain scale because ground and underground can be operated at the same time.

The top-down method is divided into several methods depending on the form supporting the formwork. SOG method in which slabs are flattened and then slabs are laid or concrete is put in place to construct the slab reinforcement, BOG method that installs girder and beam mold without installing support after pouring or throwing concrete, support method which supports support frame by using support as same as general open cut method, And the NSTD method, which is constructed by stepping up the structure with hanging from the formula.

The SOG method is effective for minimizing the depth of excavation and also for preventing the stability of the continuous wall and buckling of the RCD file. It also has the effect of shortening the air space and improving the work efficiency. However, , And it is difficult to apply it when the lower layer is rigid.

Since the BOG method does not require any additional support, the construction period required for the simple concrete construction can be shortened. However, the period required for the initial excavation of the earthwork entrance at the lower floor construction is required separately. It is troublesome to carry in and out.

In the support method, it is necessary to disassemble the formwork and the support of the slab in order to carry out the excavation of the lower-level excavation earth, so that the construction period and cost may be further increased. And the rigidity of the continuous wall must be increased due to an increase in exposure length of the continuous wall and the RCD file.

The NSTD method is disclosed in Japanese Patent Laid-Open Publication No. 1999-012858. Since this method utilizes a mold support frame suspended above the slab, there is no lower support and other obstacles, and an underground construction work is performed separately from the slab curing As the construction method can proceed, the construction period can be shortened, the quality of the concrete can be improved, and it can be effectively applied to the soft ground. Therefore, although the NSTD method is widely used in recent years, since the large molds are initially manufactured and used, the initial charging cost and the manufacturing period are required. Therefore, it is economical that the number of the underground is more than a certain number of layers. If it does not have a planar structure, it is difficult to apply.

In addition, it is impossible to proceed with the mold process and the rebar process, so that the construction period is delayed, and there is a lot of difficulty in leveling the beam lower, stepping work and tearing work, and it is difficult to dismantle by the beam, It is difficult to apply the method to the change of the position.

To improve the problems of these various top-down techniques, among the proposed techniques, as in the case of the NSTD method, there is proposed a method in which an independent mold is manufactured and used for each underground layer, This method has provided an effect of drastically shortening the construction period as compared with the conventional construction method. However, due to the fact that separate molds must be manufactured and installed in each underground floor, a lot of work time and manpower required for disassembling, arranging, and unloading of the molds and other materials must be applied, .

It is an object of the present invention to provide a method of constructing a top down concrete slab, which can simplify the work while minimizing the overall construction cost by minimizing the material such as a mold .

It is another object of the present invention to provide a mold for supporting a mold, which is simple and easy to operate and can be reused continuously, so that a cost is low, a tearing operation is advantageous, And to provide a method of constructing a top-down concrete slab.

The method of constructing a tower-down concrete slab according to the present invention is a tower-down construction method for constructing an underground structure while repeatedly repeating a basement slab and earthworks from top to bottom, step by step, A first step of installing a beam lowering frame and a single-layer beam frame and supporting the beam by a support, then installing a slab lowering frame and a slab frame, and supporting the beam by a support;

A second step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and casting concrete to form a single-layer beam and a slab;

After the concrete in the second step is cured, the support is disassembled and a trench construction is carried out to a depth of not more than one layer below the foundation, and the beam lowering frame is lowered by a lifting frame, A third step in which the slab lowering frame and the slab frame are supported by a support so that a slab frame of one basement level is installed and supported by a support;

A fourth step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and placing concrete thereon to form a 1-story underground beam and a slab;

And a step of forming the basement layer step by step while repeating the third and fourth steps up to the desired basement layer after the concrete in the fourth step is cured.

The beam lowering frame, the slab lowering frame, the beam frame, and the slab frame may be separated into a plurality of blocks, and the frames may be independently lowered and formed.

Here, the division of each of the above processes is a formal one for the purpose of understanding, and it can be realized by a continuous process without being actually divided correctly.

The lifting rods can be reinforcing bars, wires or bolts, and can be lowered in a state of being supported by a triangular support and a chain block in one layer or in an upper layer of each working layer.

In addition, when the lifting sphere is installed in the step 4, a tube is buried in a portion through which the lifting mouth passes, thereby securing a space in which the beam lowering frame and the slab lowering frame can be lowered.

The slab formwork may be provided in place of a deck, or a slab formwork may be supported by a hori- ze beam or a deck may be installed to pour concrete.

In the present invention, it is possible to construct a slab with a plurality of layers by using one frame, thereby greatly reducing the construction period and the construction cost, while separating the frame and the slab frame into a plurality of blocks, Thereby providing an effect that can be easily achieved.

In addition, according to the present invention, it is possible to minimize the material such as a mold, thereby enhancing the degree of exclusive use of the mold, and simplifying the disassembly, demolition, and arrangement of the finished material.

Prior to the construction according to the present invention, a slurry wall and a bored pile / R.C.D. construction are generally performed as a preceding construction.

The underground continuous wall (W) works to excavate the ditch in the ground and install the concrete after the reinforcing net is inserted, so that the structure can be safely and continuously constructed. In addition to its role as a temporary earth retaining wall, It has a role.

The construction of the board pile is to drill the position of the column, to insert the column steel (P) into it, to inject the reinforced concrete into the lower part of the column steel, to firmly fix it to the ground and to form the main steel column of the building It is the main criterion and support base for ongoing slab installation work.

FIG. 2 is a plan view showing an example in which a bottle frame and a slab frame are disposed at the time of construction according to the present invention, and FIGS. 3 to 8 illustrate a step in which a sequential construction is performed according to a construction method according to the present invention. Fig.

In the drawings, the same reference numerals are applied to the same names.

First, as shown in the plan view of FIG. 2, the slab forming each layer is divided into a plurality of beams b and slabs s, and a point m at which the suspension member is installed is defined for each partitioned part do.

In the first step, although not shown in the drawings, a continuous wall or a steel column is installed, and the earthquake first proceeds to the lower part of the ground, and the lowering frame and the slab of the beam and slab FIG. 3 shows the initial state of the beam lowering frame.

As shown in FIG. 3, a plurality of beam lowering frames 1 are arranged as they are partitioned. The beam lowering frames 1 include a beam 4 and a metal frame (not shown) supporting the beam 4 6, and a beam bottom plate 7 constituting a beam frame is provided on the upper surface of the beam lowering frame 1.

The metal section 6 has a "C-shaped steel" and a hanging member h is passed through the hole. The lower end and the upper end of the hanging member h are formed with a thread 8, The washer 9 is assembled to the upper and lower ends of the member h so that the upper end binds the lower plate 7 and the lower end thereof is supported on the lower side of the metal section 6, And another suspending member is connected to the threaded portion 8 by a nut.

The suspension member h may be a reinforcing bar, a wire, a bolt, a rope, or the like, and the structure capable of connecting the suspension member may be variously shaped, and any shape may be applied.

4 is a perspective view showing a state of the bicycle frame. As shown in FIG. 4, the bicycle frame 11 is provided at the top of the bicycle frame 1 to form the bike b, The hung member h is installed on the outer side of the hung member 11 and the bell pipe 14 is installed so as to secure a space for the hung member h to pass therethrough, (h).

5 shows a state in which the beam lowering frame 1 and the beam forming frame 11 are supported by the support 15 and the slab lowering frame 2 and the slab frame 12 are supported by the support 15 6 are shown together.

The slab lowering frame 2 and the slab frame 12 have the same sectional structure as the installation structure of the beam lowering frame 1 and the blanking frame 11, and the same operation is performed.

The support 15 is referred to as a so-called "shore ", and in the drawing, the middle is selected to be assembled by screwing, and can be applied integrally.

The lower end of the support 15 may be installed on the ground as it is when the support beams 15 and the slab lowering frames 2 are supported by the support 15, One or more panels 16 may be laid on the ground as required and the support 15 may be provided on the panel 16. The panels 17 may be provided on the panel 16, And the support 15 can be installed on the tree 17.

In the next step, the reinforcing bars are cultivated in the state that the bottle frame 11 and the slab frame 12 are installed as described above, and concrete is laid to form one ground layer. Fig. 7 shows a concrete structure Respectively.

In this state, the concrete is cured. When the curing is completed, the lowering work of each of the molds is performed after the subterranean trenching work as the next step. Before that, And the support 15 supporting the slab lowering frame 2 may be processed. Alternatively, the support 15 may be separated from the supports 15 and then subjected to a tearing operation. Alternatively, as shown in FIG. 8, The lower end of the support 15 is hung on one end of the beam lowering frame 1 and the slab lowering frame 2 so that the beam lowering frame 1 and the slab lowering frame 2 2), so that continuous operation can be performed.

That is, the upper end of the support 15 is fixed to the bottom of the beam lowering frame 1 or the slab lowering frame 2 with a nail, and one end near the upper end of the support 15 is separated, The bent portion 20 is connected to the pin 21 in a state of being fitted in a concavo-convex shape, and is capable of rotationally bending about the pin 21.

Alternatively, a hinge (not shown) may be attached to the upper end of the support 15 to form the bent portion by the hinge.

The support 15 is bent at the bent portion 20 of the support 15 so that the lower end of the support 15 is fastened to the beam lowering frame 1 or the slab lowering frame 2 with a strap I will.

A plurality of protrusions or holes 22 may be formed on the underside of the beam lowering frame 1 or the slab lowering frame 2 to suspend the support 15.

Fig. 9 shows a state in which the beam lowering frame 1 is lowered, and Fig. 10 shows a state in which the lower beam lowering frame 1 is provided with a bolt 11 having a single basement.

9 and 10, a triangular support 31 and a chain block 32 are installed on one ground level to lift the suspending member h to descend, and the lowered beam lowering frame 1, A bolt 11 of a basement 1 is installed on the support frame 15 and then supported by a support 15.

Subsequently, the slab lowering frame 2 and the slab frame 12 are lowered in the same manner as in the first embodiment, so that the whole form frame of the first basement is provided as shown in Fig. 11, and the concrete pouring and curing .

Subsequently, the beam and slab construction of the underground layer are repeatedly carried out by the construction method of the underground one layer as described above. When the concrete curing of the final underground layer is completed, the beam lowering frame 1, the bolt- The lowering frame 2 and the slab formwork 12 are separated and removed so as to finish the part of the corrugated pipe 14 installed to lift the suspension member h.

On the other hand, in the construction method of the present invention, the side molds can be separately constructed for each layer in the bottle mold 11 installed in the beam lowering frame 1. This is because when the beam lowering frame 1 and the bottle mold 11 are lowered This is because the side surface of the bolt hole 11 may be troublesome in the separation operation due to the contact with the slab formwork 12, so that it is more convenient to separate the bolt hole 11 from the side surface of the bolt hole 11, .

As described above, according to the present invention, the slabs of the respective basement layers can be constructed while continuously lowering the lowering frame of one layer of beams and slabs, so that the construction can be carried out easily, and the cost and manpower can be reduced by reducing the material It can be seen that

In the embodiment, the slab construction proceeds while the continuous wall and the steel column are installed in advance, but the continuous wall may not be installed in some cases.

In the above embodiment, the slab form frame is used, but the deck may be applied instead of the form frame.

The present invention as described and illustrated above is not intended to be limited to the above-described embodiments, and various modes of practice are possible without departing from the gist of the present invention. For example, the sections of beams and slabs can be arbitrarily selected according to the structure of the building, and the structure of the supports, the lowering frame and the structure of the frame itself can be selected as needed.

1 is a cross-sectional view showing a general top-

FIG. 2 is a plan view showing an example in which a bottle frame and a slab frame are arranged at the time of construction according to the present invention.

Figs. 3, 5, 6, 7, 9, 10 and 11 are diagrams showing a construction state stepwise showing an example of construction according to the present invention

Fig. 4 is a sectional view of the bottle-shaped frame according to the present invention

8 shows a state in which the support according to the present invention is folded up

[Description of Reference Numerals]

b: Measure: Slab

m: points

1: beam lowering frame 2: slab lowering frame

4: yoke 6: metal section steel

7: beam bottom plate 8:

9: Washer 11: Beam frame

12: a slab form frame 14: a corrugated pipe

15: Support 16: Panel

17: Shape 20: Bending section

21: pin 22: hole

31: triangular support 32: chain block

Claims (4)

A method of constructing a top-down concrete slab in which an underground structure is formed by repeating a basement slab and earthworks from top to bottom, A first step of performing a trench construction to the lower portion of the first story beam, installing a beam descending frame and a first-stage beam frame, supporting the same by a support, and then supporting the slab descending frame and the slab frame by a support; A second step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and casting concrete to form a single-layer beam and a slab; After the concrete in the second step is cured, the support is disassembled and the trench construction is carried out to a depth of not more than one layer below the foundation, and the beam lowering frame is lowered by a lifting section to form a one- A third step of lowering the slab-lifting frame and the slab-lifting frame so that the slab-lifting frame and the slab-lifting frame are supported by a support; A fourth step of installing a lifting platform on the beam lowering frame and the slab lowering frame, placing a reinforcing bar and placing concrete thereon to form a 1-story underground beam and a slab; And a step of forming the basement layer step by step by repeating the third step and the fourth step to a desired basement layer after the concrete in the fourth step is cured. The method according to claim 1, Wherein the beam lowering frame, the slab lowering frame, the beam frame, and the slab frame are divided into a plurality of blocks, and the lowering frame and the slab frame are independently formed. The method according to claim 1, Wherein the support is laid over a panel or a tree on the ground to support the lower end of the support. The method according to claim 1, After the concrete curing is completed, the support is bent in the middle so that the bent portion is bent before the tearing operation of the lower layer, so that the lower end of the support is suspended by the string at the lower end of the beam lowering frame or the slab lowering frame, And when it is completed, it is lowered together with the beam-lowering frame or the slab-lowering frame, and is reused as it is.

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