JPH08253947A - Installation method for form-support in reverse placing method of concrete - Google Patents

Abstract

PURPOSE: To reduce the construction period, noises at the operating time, and scattering dust, by excavating the ground corresponding to the upper one floor to install a form-support floor and hanging a suspension type form-unit on the support floor through a motor-driven chain block. CONSTITUTION: A pierced hole 9 is bored in a floor concrete N and a vertical tension bar 10 held by a horizontal material 5 is inserted in the pierced hole 9 and held by a stopper plate 11 and temporarily fixed with a nut 12. In this case, a hooking ring 15 fitting to the hook 14 of a motor-driven chain block 13 is provided at the upper part of tension bar 10. The motor-driven chain block 13 is suspended through a linking ring 18 equipped at the connection member 17 joining covering girders 16. In this state, concrete is placed in the slab N and then the ground is excavated in the state the suspension type form- unit H is hung to install a form-support floor on the ground corresponding to the lower one floor. Subsequently, the form-unit H is slid down to install it on the form-support floor and reinforcements are arranged in the form-unit H and a hollow steel pipe column is suspended and the slab concrete is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing formwork supports for constructing an underground structure by a reverse driving method.

[0002]

2. Description of the Related Art When constructing an underground structure, especially an underground parking lot constructed under the road or a subway station building, first perform a mountain retaining to prevent the surrounding ground from collapsing, a crossbeam, and an abdomen. A so-called progressive driving method is generally performed in which a mountain retaining structure consisting of etc. is horizontally erected and sequentially excavated to a predetermined depth, and after foundation work, the foundation work is sequentially constructed from the lower floor to the upper floor. .

In some cases, the reverse construction method is employed in which the upper floors are constructed to the lower floors. In this reverse-placing method, after pile-mounting, primary excavation is performed and waste concrete is placed, the top slab formwork on the upper floor is assembled, and then rebar is assembled and concrete is placed, and the cast concrete is hardened. Then, when the required strength is developed, the formwork is disassembled and removed,
A second excavation is repeated to reverse the above steps to build a lower floor and finally a foundation.

[0004]

[Problems to be Solved by the Invention] When constructing an underground structure, which one of the above-mentioned progressive construction method and reverse construction method is adopted is selected depending on the environment around the construction site and the factors of the construction period. To do. However, in the progressive casting method, the support work is assembled to assemble the formwork, the reinforcing bars are laid out and concrete is placed, and after the placed concrete has hardened, the formwork is dismantled and transported to the next upper floor. To do.

Further, in the reverse driving method, since the lower floor is further excavated after the concrete is placed, the formwork material must be carried out to the outside of each floor. Under such circumstances, when constructing an underground structure in an urban area, especially under a road surface with many shopping streets, there is a lot of construction material loading and unloading and work noise, and a great deal of cost is required to prevent such so-called construction pollution. Not only that, it requires a large number of workers, which is a cause of delay in construction, and there is a problem in that it is difficult to collect materials.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The purpose of the present invention is to rationalize the formwork construction method when constructing an underground structure by the upside down construction method, and plan the material. The goal is to provide a method for installing formwork support in the reverse striking method that shortens the construction period and reduces construction pollution to the neighborhood by effective operation and labor saving.

[0007]

In order to achieve the above-mentioned object, according to the method of installing the form support in the reverse driving method according to the present invention, in the reverse driving method of constructing an underground structure from the upper layer to the lower layer, The ground corresponding to the first floor of the upper floor is excavated to provide a formwork support floor, and the suspension formwork unit is installed on the support floor.

According to the second aspect of the present invention, in the suspension formwork unit, a horizontal member for supporting and suspending work is installed in the middle of the supporting work standing on the support floor, and the supporting and suspending top frame is provided at the top of the supporting and support work. It is composed of a formwork in which a hauling material is installed and joists are arranged. According to the invention of claim 3, in the suspension formwork unit, the horizontal members for supporting and suspending are suspended by the electric chain blocks arranged at appropriate intervals, and after the construction of the required floor, it is located on the lower floor. It is suspended and installed on the formwork support floor.

[0009]

According to the present invention, in the reverse driving method for constructing an underground structure from the upper layer to the lower layer, the ground corresponding to the first floor of the upper floor is excavated to provide a formwork support floor in the underground portion and suspend it on the same floor. The first floor is constructed by installing a type unit and using it as a formwork for the upper floor and placing concrete.

According to the second aspect of the present invention, a supporting work is erected on the support floor, and a horizontal member for suspending the supporting work is arranged in the middle of the supporting work. By installing the material and arranging joists, the support work and the formwork are integrated,
A wide range of formwork units are formed. According to the invention of claim 3, after the suspension formwork unit suspends the horizontal member for suspending the support work by the plurality of electric chain blocks arranged at appropriate intervals, and constructs the hierarchy. By installing the formwork support floor by suspending it on the lower floors, the work of assembling and dismantling the formwork is not required, the time and effort of formwork is greatly reduced, the transportation of materials is rationalized, and labor saving is planned. To be

[0011]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a vertical cross-sectional view of an underground structure A constructed by the reverse striking method of the present invention. The underground structure A has two floors, a foundation K, an outer wall W, a steel pipe column C and a slab beam S of each floor. It is composed of ₁ , S ₂ , and S ₃ .

When constructing the above-mentioned underground structure A, a mountain retaining wall 1 is built on the surrounding ground, an intermediate pile 2 for supporting the roadbed and the underground structure A is further placed, and after the primary excavation a, the roadbed R is lined up. . After the secondary excavation b, the formwork support floor 3 is provided on the ground corresponding to the upper first floor. (See FIG. 2) In the figure, P is an excavator. Next, a supporting structure 4 for supporting the formwork on the upper and first floors is installed on the form supporting floor 3, and a horizontal member 5 for suspending the supporting structure is installed in the middle of the supporting structure 4 for auxiliary supporting structure. Suspended formwork unit H composed of slab formwork 8 in which joist 6 is installed on top of 4a and joists 7 are assembled.

Although the frame scaffolding and the auxiliary supporting work 4a are used in the illustrated embodiment, for example, a supporting stage using a single pipe or a supporting stage using a temporary beam may be used. The (stage) can be suspended by a horizontal member. The suspension formwork unit H is assembled, the reinforcing bars are arranged in the slab formwork 8 and the floor concrete N is placed, and then the suspension of the unit is prepared.

That is, a through hole 9 is provided in the floor concrete N,
A tension bar 10 vertically extending through the hole 9 suspends the horizontal member 5 from the horizontal member 5, penetrates the through hole 9 and sandwiches a stop plate 11 which is divided into two parts, and temporarily fixes it with a nut 12. A locking ring 15 that engages with the hook 14 of the electric chain block 13 is mounted on the upper portion of the tension bar 10. The electric chain block 13 is a connecting member 17 for connecting between the lining girders 16.
It is suspended via a locking ring 18 provided on the. (See FIG. 3) Next, in this state, the floor concrete N of the slab S ₁ is poured. (See FIG. 4) Next, as shown in FIG. 5, after performing the tertiary excavation c while suspending the suspension formwork unit H, the formwork support floor 3'is placed on the ground corresponding to the lower one floor. Set up.

Next, the suspension formwork unit H is slid down by the electric chain block 13 to be installed on the formwork support floor 3 ', and is arranged in the formwork unit H, and the hollow steel pipe column C is connected to the upper beam. It was suspended underneath, to pouring the concrete of the slab S _2. (Refer to FIG. 6) Thus, the above-mentioned steps of the first-floor floor are repeated, and the steps are constructed from the upper floor to the lower floor,
(See Fig. 7) Finally, the foundation is constructed and the unnecessary intermediate pile 2 is removed.

[0016]

As described above, according to the present invention, when constructing an underground structure by the reverse construction method as described above, the ground corresponding to the upper first floor is excavated to form a form supporting floor, and the floor is suspended on the same floor. By installing the formwork unit, the same formwork unit becomes the formwork on the upper floor and concrete is placed to build a single floor, which is diverted to the lower floor, so that the work of assembling and dismantling the formwork is omitted. In addition, the work of transporting construction materials is greatly reduced, which saves labor and shortens the construction period, and also reduces the scattering of noise and dust associated with the work, improving the working environment.

According to the second aspect of the present invention, a horizontal member for supporting and suspending work is erected in the middle of the supporting work in which the suspension formwork unit is erected on the formwork support floor, and the supporting work top portion is provided. By arranging a hauling material on the
A wide range of formwork units are constructed by integrating the support work and the formwork. According to the invention of claim 3, in the suspension formwork unit, the horizontal members for supporting and suspending work are suspended by the electric chain blocks arranged at appropriate intervals. Since it is hung and installed on the form supporting floor, the work of assembling and dismantling the form is unnecessary, the labor of the form work is greatly reduced, the ratio of material transportation is rationalized, and the work is saved. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an underground structure constructed by the method of the present invention.

FIG. 2 is a vertical cross-sectional view showing a process of excavating the ground and placing intermediate piles and excavating the ground to construct a structure underground.

FIG. 3 is a vertical cross-sectional view showing a main part of a suspension formwork unit.

FIG. 4 is a vertical cross-sectional view showing an example in which a suspended formwork unit is used to build from the upper floor.

FIG. 5 is a vertical cross-sectional view showing a state in which the suspension formwork unit is suspended by a third excavation.

FIG. 6 is a vertical cross-sectional view showing a state where the suspension formwork unit is suspended and installed after the third excavation.

FIG. 7 is a vertical cross-sectional view showing a state in which the form unit is suspended and installed on the lower floor, reversing the above steps.

[Explanation of symbols]

A Underground structure C Steel pipe column H Suspended formwork unit N Floor concrete P Excavator R Roadbed S ₁ , S ₂ , S ₃ Slab W Outer wall 1 Mountain retaining wall 2 Intermediate pile 3, 3'Form support floor 4 Supporting work 4a Auxiliary support 5 Horizontal material 6 Large pulling material 7 Jouta 8 Slab formwork 9 Through hole 10 Tension bar 11 Stop plate 12 Nut 13 Electric chain block 14 Hook 15 Locking ring 16 Lining girder 17 Connecting material 18 Locking ring a Primary drilling b Secondary drilling c Third drilling

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Sumiyoshi 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd.

Claims (3)

[Claims] 1. In a reverse driving method for constructing an underground structure from an upper layer to a lower layer, the ground corresponding to the upper first floor is excavated to provide a formwork support floor, and a suspension formwork unit is provided on the support floor. A method for installing formwork support in a reverse driving method characterized by installing. 2. The suspension formwork unit comprises a horizontal suspension member for suspending and suspending the support work installed in the middle of the support work erected on the support floor, and a hauling member is erected on the top of the support work. An installation method of formwork support work in a reverse striking method composed of formwork with joists. 3. In the suspension formwork unit, horizontal chain members for supporting and suspending work are suspended by electric chain blocks arranged at appropriate intervals, and suspended on lower floors after a required floor is constructed. The method for installing formwork support in the reverse casting method according to claim 1 or 2, wherein the method is installed on the formwork support floor.