JPS6256296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temporary structure constructed in order to facilitate work from above ground during the construction work of a building having an underground structure such as a basement floor. Temporary piles such as H-shaped steel that support the above-ground floor will be pulled out and removed from the permanent concrete basement floor after the underground construction is completed, or pipes will be installed on concrete parts such as floors and walls. Through-holes are formed at appropriate locations in the concrete so that they can be easily penetrated later and fixedly supported by pouring concrete around the holes.Furthermore, balconies, road parapets, separation strips, and guardrails. This invention relates to a method for constructing concrete structures such as underground floors, walls, balconies, roads, etc., by forming recesses at required locations in the concrete part so that supports such as these can be embedded and fixedly supported in the concrete part.

Among the various methods mentioned above, taking as an example the first-mentioned basement floor construction work of a building with a basement floor, the general sequence of basement floor construction work is as shown in Figure 1. ) Construct an earth retaining wall A using sheet piles etc. around the planned construction site, (2) Drive temporary piles 2 such as H-beam steel from the ground, (3) Drive the temporary piles 2 on the ground supported by the temporary piles 2. Install the temporary floor S, (4) Excavate to the required depth using an excavator B such as a excavator placed on the temporary floor S, (5) Construct the concrete floor 1 of the basement floor, (6) The above temporary floor (7) Back-filling the through holes formed in the concrete floor 1 where the piles were removed, with concrete. In order to make it easier to pull out and remove temporary piles and to avoid damaging the concrete floor when pulling out and removing them, conventional methods have generally been used as shown in Figures 5 and 6. A plywood formwork 03 is assembled around the entire outer circumference of the temporary pile 2, such as the H-type steel, and concrete is poured to the outer circumference to construct the concrete floor 1. Once the concrete has hardened, the temporary pile 2 is pulled out and removed. However, this conventional method had the following problems. In other words, in order to make it easier to pull out the temporary pile and to make it easier to peel the formwork from the concrete, it is necessary to provide a sufficient distance between the outer surface of the temporary pile and the inner surface of the formwork. There is. In other words, it is necessary to use a formwork that is sufficiently large in size compared to the pile, and therefore there is a risk of workers accidentally dropping their feet into the large opening formed between the inside of the formwork and the outside of the pile. B○ Bolts and various metal objects may fall from the opening, causing damage to people and property downstairs. H○ Formed by backfilling the through hole where the piles were removed and the opening. In order to construct a floor section with the same strength as the surrounding floor section, it is necessary to install reinforcing bars similar to those of the surrounding floor section, and it is also necessary to connect the reinforcing bars with the surrounding reinforcing bars. in,
The amount of time and expense required for post-processing is enormous, and the amount of concrete required for backfilling the openings is large, and it is necessary to manually feed this into the openings. There are many problems such as the labor required, and there is a strong demand for a method that can avoid the occurrence of personal accidents such as A and B.

In view of the above circumstances, the present invention aims to solve the above-mentioned problems in terms of safety, cost, and labor. The method for constructing a concrete structure is to attach plastic or plastic to the outside of the penetrating or embedded part of a temporary member that is installed to penetrate the concrete part or to partially embed it in the concrete part. A concrete release member made of a solid, hollow or foamed rubber material is fitted and installed, concrete is poured in this state, and after the concrete has hardened, the temporary member and mold release member are removed. , and backfilling the through hole or recess at the site of the removal with concrete, or
It is characterized by concrete placement for fixedly supporting parts of various structures either through or embedded in the structure. Instead of the conventional plywood assembly formwork, a plastic or rubber assembly form is installed on the outside of the temporary member to facilitate the removal and removal of the temporary member after construction of the concrete section. The most distinctive feature is that it uses a special mold release member that is solid, hollow, or foam-molded. Due to these features, the synergistic effect of the material properties of the mold release member itself, such as elasticity and flexibility, and its resistance to adhesion to concrete, makes it easy to peel and remove the mold release member from hardened concrete. This can be done well without causing damage to the concrete part, and it is also easy to remove the mold release member from the temporary member. There is no need to use a material, and in the extreme, it is possible to use a material that fits closely to the temporary member. Therefore, compared to the conventional method using plywood assembly forms as described above, the openings are very small or can be eliminated, making it easier for workers to trip and for various objects such as bolts to be removed. This not only prevents personal injury and property damage caused by falling, but also reduces the size of through-holes or recesses where temporary members and mold release members have been removed to the minimum necessary size, making it easier to use when backfilling concrete. The entire concrete area, including the backfilling area, can be post-treated to have almost uniform strength without requiring the time and effort of placing reinforcing bars in the area, and it is possible to post-process the entire concrete area, including the backfilling area, to make it almost uniform in strength. This has resulted in many benefits in terms of safety, cost, and labor, such as the amount of concrete required for the construction.

Hereinafter, an embodiment in which the method of the present invention is applied to a basement floor construction method of a building having a basement floor will be described in detail.The general sequence of basement floor construction work has already been explained with reference to FIG. Among them, the concrete of the temporary pile 2, such as H-shaped steel, is an example of a temporary member that is driven from the ground and erected to support the temporary work floor S that is installed along or almost along the ground surface GL. As shown in FIGS. 2 and 3, on the outside of the penetrating portion 2A for the reinforced concrete floor 1 of each basement floor, which is an example of a section, a solid material made of polymeric material such as plastic or rubber is divided into left and right halves, and A concrete release member 3 formed to have a similar cross-sectional shape to the temporary pile 2 is fitted, and this is attached to the temporary pile 2 using tape or adhesive.
Hold it firmly in place. In this state, concrete is poured into the basement floor to construct floor 1. After the floor concrete has hardened, the temporary piles 2 and release members 3 are pulled out and removed, and the through holes 4 where they were removed are backfilled with concrete 1A as shown in Fig. 4. concrete floor 1
The goal is to build. When the floor concrete hardens, it is possible to remove only the detachable member 3 and use it for the next floor, but it is possible to remove the detachable member 3 and use it for the next floor, but it is not possible to install the temporary piles 2 after the construction of the concrete floor 1 on each basement floor is completed. If it is used so that it is pulled out and removed together when it is pulled out and removed, no gap will be formed between the pile 2 and the concrete floor 1, which is more effective in terms of safety management such as preventing objects from falling.

Other examples will be listed below.

The temporary pile as a temporary member may be of any shape other than H-shaped steel, such as round, square, channel, and angle.

This may be carried out when forming a through hole for supporting pipes in a concrete part such as a floor or a wall in a penetrating state.

This method may also be used to erect pillars for balcony handrails, road median strips, guardrails, etc. with their lower ends embedded.

Polymer materials such as plastic and rubber that form the mold release member 3 originally have a property of being difficult to adhere to concrete. By applying a strong non-adhesive coating, it will be easier to peel off from the concrete. Furthermore, if the mold release member 3 is made hollow and can be expanded and contracted by filling and extracting gas, liquid, or powder into the inside,
Needless to say, the structure must be such that it can be easily removed from the hardened concrete, and at this time, it will not be deformed by the pressure of the concrete.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of the entire basement floor construction, Figure 2 is an enlarged vertical side view of the main part, Figure 3 is a cross-sectional view along the line shown in Figure 2, and Figure 4 is after backfilling. Figures 5 and 6 are enlarged vertical side views of the main parts of the conventional method and Figures 5--
FIG. 1... Concrete part, 2... Temporary members, 3...
...Release member, 4...Through hole or recess.

Claims (1)

[Scope of Claims] 1. The outside of the penetrating part or embedded part 2A of the temporary member 2 that is installed to penetrate the concrete part 1 or to partially embed it in the concrete part 1. Then, a concrete release member 3 made of plastic or rubber material into a solid, hollow or foamed form is fitted and attached, concrete is poured in this state, and after the concrete has hardened, the temporary member 2 and Remove the mold release member 3 and backfill the through hole or recess 4 where it was removed with concrete, or place concrete to fixedly support parts of various structures in a penetrating or embedded state. A method of constructing a concrete structure characterized by performing the following steps. 2. The concrete according to claim 1, wherein the concrete release member 3 is solid, and at least its outer surface is made of a material that is highly non-adhesive to concrete. How to build structures. 3. According to claim 1, the concrete release member 3 is hollow and is configured to be able to expand and contract when filled with or extracted from gas, liquid, or powder or granules. method of constructing concrete structures.