JPH0579049A - Constructing method for beam and slab in underground body construction work - Google Patents

Abstract

PURPOSE:To provide a constructing method for beam and slab for an underground body in a reverse driving method, which requires no profession, dispenses with extensive form materials and supports, promote a job for labor-saving and reduces the cost of construction. CONSTITUTION:In a reverse driving method, the ground is excavated up to a lower part a little lower than a beam with the maximum beam formation of a working floor, and paving sand 2 is spread over an excavated surface 1, laying down a backing plate 3 on the surface. Then, a girder, a beam, each of forms 4, 4' and a slab mold form 5 are assembled by a form unit on this backing plate 3, assembling beam reinforcements 8, 8' and a slab reinforcement 9 in each form, and concrete is placed. After the driven concrete is hardened up to the specified strength, the next lower layer is excavated, while the form is dismantled, thus an underground body is constructed.

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 a beam and a slab in an underground skeleton construction, and more particularly to a method for constructing a beam and a slab in a basement floor in a reverse construction method for an underground structure.

[0002]

2. Description of the Related Art Conventionally, when constructing a beam or slab on the basement floor in the reverse construction method for an underground structure, after constructing a mountain retaining a along the outer wall around the building, a temporary pillar or a structure for supporting the structure is constructed. By embedding the true pillar b and supporting the basement, and constructing the slab c and the beam d on the same basement, excavation to the appropriate depth below the beam and slab on the opposite floor, and discarding concrete to the same excavation level. Assemble the formwork by casting it to form pillars, beams, alloy formwork and pipes to form slabs, pipes, binding materials, etc., and support discarded concrete by supporting work such as the lower part of the formwork. Then, after assembling the reinforcing bars, the concrete is poured, and after the cast concrete exhibits the required strength, the formwork is dismantled and the construction is repeated on the next lower floor. (Refer to FIG. 9) Similarly, the foundation part e is also excavated to a predetermined depth, then casts discarded concrete to assemble plywood formwork for beams and slabs, assembles reinforcing bars, and then casts concrete. After the cast concrete exhibits a predetermined strength, the formwork is disassembled. In the figure, f is a pile and g is a top slab.

In addition to the above-mentioned construction method, a ground-form construction method as shown in FIG. 10 has been conventionally used. In this construction method, a beam type on a predetermined basement floor is excavated up to the bottom of the slab, a vinyl sheet h is laid on the beam type part g on the same excavation surface, and a mortar k is laid on the excavation surface under the other slab i. This is a construction method in which the molds are laid out evenly and only the beam mold part g is assembled.

[0004]

According to the above-mentioned conventional method, a large amount of various formwork materials such as formwork plywood, thick pipes, form ties, and formwork assembly materials are required for assembly of formwork, and material management is required. However, the cost increases due to the wear of materials, etc., and the support work for supporting the slab is required, and the work of assembling and disassembling these forms requires a great deal of work, and is performed by a professional formworker. It is very difficult to secure a member.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and the object of the present invention is that it does not require a professional worker and a large amount of formwork material support work. The purpose is to provide a construction method for beams and slabs in underground framing work that saves labor and saves construction costs.

[0006]

In order to achieve the above object, according to the method of constructing a beam and a slab in an underground skeleton construction work according to the present invention, a reverse skeleton is constructed by sequentially constructing an underground skeleton from an above-ground portion toward a lower underground. In the driving method, excavation is carried out to a little lower than the beam having the largest beam composition on the construction floor, the sand is spread evenly on the bottom of the excavated part, and the base plate is laid evenly on the spread sand. Assemble the beam and slab formwork with the formwork unit on the top, assemble the rebar in each of the formwork and place concrete, and after the placed concrete develops a predetermined strength, excavate the next lower layer, The formwork is disassembled to construct an underground structure.

[0007]

According to the present invention, as described above, in the reverse striking method, excavation is carried out to a little lower than the beam having the largest beam formation in the construction floor, and the sand is evenly spread evenly on the bottom surface of the excavated part and evenly distributed. By laying an underground plate and using the excavated ground itself as a support plate for the beam slab to assemble the beam and slab form on the base plate to eliminate the need for supporting work and to construct the form with a form unit. By doing so, the plywood for the formwork and the material for assembling the formwork are made unnecessary.

[0008]

The present invention will be described below with reference to the illustrated embodiments. As shown in Fig. 1, in the reverse construction method, horizontal excavation is carried out to a little below the beam position with the largest beam formation on the construction floor,
Spread the sand 2 evenly on the excavated surface 1 and spread the sand 2
The base plate 3 shown in FIG.
Laying down, and girder form 4 and slab form 5 on the base plate 3
Assemble

The girder mold 4 is composed of an L-shaped plate 4a made of a pair of opposing resin foams (see FIG. 4), and the slab mold 5 is foamed in which locking recesses 6 are formed in rows on the opposite surfaces. A pair of upper and lower horizontal plates 5a made of resin, and each horizontal plate 5a.
It is composed of a bundle material 5b made of foamed resin, which is fitted over the recesses 6 of FIG. (See FIGS. 5 and 6) The beam form 4'is a pair of Ls smaller than the L-shaped plate 4a.
Between the lower side of the template 4'a and the base plate 3, an auxiliary unit material 7 made of foamed resin shown in FIG. 7 is interposed.

Next, beam reinforcements 8 and 8'and slab reinforcements 9 are respectively assembled to the large beam formwork 4, the small beam formwork 4'and the slab formwork 5 and concrete is poured into them, and the cast concrete has a predetermined strength. After that, the lower layer is excavated, the molds are demolded, and girders, girders, and slabs are constructed. FIG. 2 shows another embodiment of the present invention, showing a case where a foamed resin block 10 molded into a certain size as shown in FIG. 8 is stacked in the shape of a beam or a slab to form a formwork to form an underground structure. .

In the figure, the same parts as those in the above embodiment are designated by the same reference numerals.

[0012]

As described above, according to the present invention, by unitizing the mold as described above, it is possible to easily assemble the mold without the need for beam-shaped machining as in the conventional case. Further, according to the present invention, since the excavated ground is a beam type, a supporting plate for the slab does not require support work, and concrete beams and slabs can be used without using various materials such as formwork plywood, thick pipes and foam ties. Since it can be installed, there is no problem of material management and wear.

According to the second aspect of the present invention, the beam form unit is composed of one pair of L-shaped plates facing each other, and the slab form unit is composed of one pair of upper and lower horizontal plates and a bundle member. Assembling and disassembling can be performed easily without the need for a professional, saving labor and reducing construction costs. According to the invention of claim 3, since the mold unit is made of foamed resin, it is lightweight and has corrosion resistance, the mold can be assembled and disassembled more easily, and the used mold unit can be recovered and reused. It is provided to the public and the economic efficiency is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an implementation state of an embodiment of a construction method for a beam and a slab in an underground skeleton construction work according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an implementation situation of another embodiment of the present invention.

FIG. 3 is a perspective view of a base plate.

FIG. 4 is a perspective view of a beam form unit.

FIG. 5 is a perspective view of a horizontal plate in the slab form unit.

FIG. 6 is a perspective view of a bundle material in the slab form unit.

FIG. 7 is a perspective view of an auxiliary unit.

FIG. 8 is a perspective view of a foamed resin block.

FIG. 9 is a vertical sectional view showing an example of a conventional method.

FIG. 10 is a vertical cross-sectional view showing another example of the conventional method.

[Explanation of symbols]

 1 excavated surface 2 spread sand 3 base plate 4 girder formwork 4a L-shape plate 4'small beam formwork 4'a L-shape plate 5 slab formwork 5a horizontal plate 5b bundle 6 locking recess 7 auxiliary unit 8, 8 ′ Beam reinforcement 9 Slab reinforcement

Claims (3)

[Claims] 1. In the reverse driving method for constructing an underground skeleton sequentially from the above-ground part to the lower part of the underground, excavation is carried out to a part lower than the beam having the largest beam composition of the construction floor, and the sand spread on the bottom of the excavated part is smoothed. And lay the base plate evenly on the same sand, assemble the beams and slab formwork on the base plate with the formwork unit, assemble the reinforcing bars in each formwork, and place concrete. A method for constructing a beam or slab in an underground skeleton construction, which comprises constructing an underground skeleton by disassembling the formwork and constructing an underground skeleton while excavating the next lower layer after the cast concrete exhibits a predetermined strength. 2. The beam form unit is composed of a pair of L-shaped plates facing each other, and the slab form unit is composed of a pair of upper and lower horizontal plates and a bundle member connecting the horizontal plates. Construction method of beams and slabs in the underground structure work described. 3. The method for constructing a beam or slab in an underground skeleton construction according to claim 2, wherein the form unit is formed of foamed resin.