JPS61266731A - Foundation formwork for column and its application - Google Patents

Abstract

PURPOSE:To erect columns on the ground with sufficient bearing capacities in a short period of construction by a method in which a cylindrical steel plate consisting of reinforcing bars is penetrated into a pit excavated by auger, a column is inserted into the cylindrical steel plate, gravels are charged into the space around the column, and a quick-drying cement mortar is poured into the space. CONSTITUTION:Plural reinforcing bars 4 are fixed in an equal arrangement to the periphery of a cylindrical steel plate 2 with many through holes 3, and plural ring bars 5 are fixed to the outside of the bars 4. The foundation formwork 1 for erecting columns is penetrated into a pit (a) excavated by auger, a column is inserted into the plate 2, graves 7 are packed into the space between the plate 2 and the column (b), and a quick-drying cement mortar 8 is poured into the spaces among the gravels 7, the plate 2 and the pit. The apertures in the gravels 7 can thus be completely packed by high-speed hardening of the cement mortar 8, and the mixture of soil into the foundation and the degradation of the soil of side wall of the pit (a) can be prevented. The foundation can also be strengthened axially by the vertical and ring reinforcing bars 4 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION A. Field of Industrial Application The present invention relates to a foundation formwork and method for erecting pillars such as sign balls or road lighting poles into the ground.

Conventional technology The construction method described above involves inserting columns into a large hole excavated from the ground, pouring ready-mixed concrete into the holes, and temporarily fixing the columns with separate supporting materials until the concrete hardens completely. Ta.

Problems to be Solved by the Invention According to the above-mentioned conventional technology, the construction period is long because it is necessary to wait for the ready-mixed concrete to completely harden before removing the supporting material, and the inner wall of the hole is damaged when pouring the ready-mixed concrete. It was easy to collapse, and there was a high risk that the collapsed soil would deteriorate the strength of the ready-mixed concrete.

20 Means for Solving the Problems The present invention uses quick-drying fluid mortar instead of ready-mixed concrete in order to significantly shorten the construction period required for pillar erection. However, the quick-drying mortar is expensive. Therefore, by mixing it with gravel and reducing its usage, its practicality can be further improved.

When this quick-drying mortar is dissolved in water, it hardens within minutes, but before hardening it is a fluid with the same viscosity as water, so when poured into gravel, it completely fills the gaps between the gravel. Therefore, unlike ready-mixed concrete, there is no need to stir and mix it with gravel in a separate container before use, increasing work efficiency.

When using the quick-drying mortar, the present invention involves inserting a cylindrical iron plate made of reinforcing bars into an auger excavation hole, inserting a column into the cylindrical iron plate, and pouring gravel around the column before applying the quick-drying mortar. However, since these processes are carried out inside a cylindrical iron plate, there is no need to disturb the soil in the excavation hole as in conventional techniques, and the quick-drying mortar that hardens inside the cylindrical iron plate is not deteriorated by the soil. There is no risk of

In addition, the gap between the excavation hole and the outer wall of the cylindrical iron plate is such that quick-drying mortar leaks from the many holes drilled in the cylindrical iron plate, fills the gap, and then hardens. The foundation is made of reinforcing bars, and the columns can be built into the ground with sufficient support through quick-drying mortar.

Ho0 action and examples The present invention will be explained in detail below with reference to the drawings.

Figure 1 shows foundation formwork 1 for pillar construction. 2 in the figure. has a large number of through holes 3. is a cylindrical iron plate with perforations, and the cylindrical iron plate 2
．． There are multiple vertical stripes on the outer peripheral surface of 4. are fixed evenly in the axial direction,
Furthermore, the longitudinal stripes 4. A plurality of orbicularis muscles 5 are arranged at appropriate intervals around the
．． A cylindrical iron plate 2. The inner diameter of the cylindrical iron plate 2 must be appropriately larger than the outer diameter of the pillar to be erected. and vertical stripes 4. The orbicularis muscle that is integrated through the 5. The diameter of the outer edge of the auger hole should be appropriately smaller than that of the auger borehole.

The above foundation formwork for pillar erection 1. The usage method begins with inserting the auger into the excavated hole a, as shown in Figure 2, and first, the foundation formwork 1. Gravel below 7. 7. Pour the gravel until it reaches the required height. Place the pillar on top of it.

Figure 3 shows the above gravel 7. 8 degrees of quick-drying fluid mortar was poured into the gravel 70 to harden it, and another layer of gravel 7 was poured around the pillars. This indicates the stage at which the gravel has been filled with another 70
Quick-drying mortar 8 is poured into the area as shown in Figure 4.

Quick-drying mortar poured in the steps shown in Figures 3 and 4 8. is gravel 7.7. While filling the void in the cylindrical iron plate 2. Through hole 3. Leakage from the cylindrical iron plate 2. and the auger drill hole a, filling the gap between the auger drill hole a and the auger drill hole a.

A foundation that is closely attached to the ground is formed.

The formed foundation is gravel 7.7. Also, in the introduction of
Quick-drying mortar8. Even when flowing into the auger hole a, these do not come into direct contact with the auger borehole a, and all of them are connected to the cylindrical iron plate 2. Because it is carried out inside the concrete, it is possible to avoid breaking up the soil or getting the collapsed soil involved, unlike the conventional technique of pouring ready-mixed concrete. and quick-drying mortar 8
．． A pure mixed cured product can be formed.

Also, cylindrical iron plate 2. Vertical strips integrated with 4. and orbicularis muscle5. is quick-drying mortar8. After filling, the cylindrical iron plate 2. Through hole 3
．． Quick-drying mortar leaked from 8. 8. The quick-drying mortar formed in the embedded part of the pillar has no risk of corrosion in the soil because it is completely covered with the mortar. It also has the effect of further strengthening the basic body.

As mentioned above, the quick-drying mortar 8. Since gravel has the property of hardening in minutes, the gravel placed around the pillars as shown in Figure 4.7. After pouring it into the concrete, once the hardening condition is confirmed, all construction work is completed.

Effects of the Invention 8 As described in the detailed explanation of the invention, according to the present invention, the erection of columns can be completed in a short period of time, and the concrete is mixed with gravel in advance like when using ready-mixed concrete. It also saves you time and effort,
Work efficiency is greatly improved.

Also, cylindrical iron plate 2. The effect of the auger drilling hole a is that it sufficiently prevents the soil from collapsing on the side walls and mixing with the foundation, and the vertical bars 4. and orbicularis muscle 5. This has the effect of strengthening the foundation in the axial direction, and the practical effects of the present invention are extremely large.

[Brief explanation of drawings]

The drawings relate to the foundation formwork for pillar construction of the present invention and its method of use; FIG. 1 is a perspective view of the foundation formwork for pillar construction, and FIG. 2 is a side view for explaining the method of use. FIG. 3 and FIG. 4 are cross-sectional views related to the same explanation. Note 1: Foundation formwork for pillar construction 7.7. : Gravel 2: Cylindrical iron plate 8: Mortar 3: Through hole a
: Auger drilling hole 4: Vertical bar b: Column 5: Orbicular bar or above

Claims (2)

[Claims] (1) A plurality of longitudinal reinforcements are fixed at equal intervals to the outer peripheral surface of a cylindrical steel plate with a large number of through holes, and a plurality of orbicular reinforcements are further fixed at appropriate intervals around the longitudinal reinforcements. Foundation formwork for pillar construction. (2) A plurality of longitudinal reinforcements are fixed at equal intervals on the outer peripheral surface of a cylindrical steel plate with a large number of through holes, and a plurality of orbicular reinforcements are further fixed at appropriate intervals around the longitudinal reinforcements. Insert the foundation formwork for pillar construction into the auger excavation hole, insert the pillar to be erected into the cylindrical iron plate, fill the gap between the pillar and the cylindrical iron plate with gravel, and then pour quick-drying fluid mortar to fill the gravel void. and a method for using a foundation form for pillar construction, which is characterized by filling the gap between a cylindrical iron plate and an auger excavation hole and solidifying it in a short time to construct a pillar.