JPS621949A - Construction of concrete pillar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for constructing concrete 1-H, and in particular, to a method for constructing a concrete formwork using a precast hollow section shrine.
A horizontal construction method in which the formwork is also used as a structural material and as a structural material.

(Problems with conventional technology) 1) When constructing reinforced concrete, wooden plywood is generally used as the formwork. These molds must be removed after the concrete has cured, so -
Since there are many industrial culms and accidents are likely to occur during demolding work, it is necessary to take precautions to ensure work safety.

In addition, the conditions for fixing or supporting this type of formwork are generally extremely poor, and it can easily shift or fall, so it requires considerable skill to erect formwork with precision. to the east. Furthermore, when using the formwork of this scale, the pressure of concrete 1 is applied to the formwork when pouring concrete.
111, so it is necessary to provide sufficient reinforcement with wooden or steel crosspieces or crosspieces, and if this is not done,
The formwork becomes deformed, reducing accuracy, and in extreme cases, the formwork breaks and concrete spills out. In addition, wood IXl≧11! The frames were difficult to repurpose, and a large amount of waste material was generated after the work was completed, which was a pain to dispose of.

On the other hand, using precast concrete 1/board as the formwork,
A permanent formwork is proposed in which this material can be used as a finishing material or as a base material for the sill-V.

According to this permanent formwork, demolding work is required (2), so work efficiency and work safety are improved, and there is no need for labor to dispose of waste materials that are generated in the case of wooden formwork.However,
This type of permanent formwork made of 1 piece of cast wood and 1 piece of wood has the same panel shape as conventional wooden formwork, but has a different quality, so it requires less time and effort to ensure accuracy than before. We cannot expect it to decrease any further. Furthermore, in order to prevent the formwork of the concrete pouring step from deforming, it is necessary to ensure a sufficient plate thickness, which increases the weight and makes construction work easier than before. It also tends to decrease. ! In order to reduce the number of plates I9, reinforcing bars or the like may be added to the formwork, but problems such as rusting occur in terms of durability.

In addition, these are precast concrete! 1′! The frame itself is strong enough and can be copied as part of a structural material. However, the commonly used precast formwork is panel-shaped as mentioned above, so the structure to be constructed is surrounded by four boards, and the concrete and precast formwork are joined together inside the precast formwork. Stress transmission between the two will depend solely on adhesion. For this reason, the two are easy to separate, and it is difficult to consider them as an integrated structural material. Of course, it is also possible to increase the contact area by creating irregularities on the inside of the formwork, or to use steel hooks inside the formwork to mechanically fix the formwork to the concrete columns. .

However, even with the columns obtained in this way, it is still unreasonable to expect complete integration up to the final structural state. Currently, there are almost no examples of iQ ill.

This invention was made in view of the problems of the prior art (1), and its purpose is (1) to use precast concrete formwork as a permanent formwork,
For products that are intended to be used as a base for IJ or finishing, the construction can be performed easily and with high precision.
Moreover, after construction, it becomes part of the structural frame that is integrated with the pillars.

(Means for solving the problem) In order to achieve the above object, in the construction method of the present invention,
On the outer periphery of the constructed reinforcing bars or steel frames, we installed a formwork in which fiber-like dark blue material was buried in the vertical and horizontal directions on the inner surface of a precast hollow cross-section material whose main material was =4- cement-based non-R material. , a concrete column is constructed by stacking one or more columns and pouring concrete into the inner periphery of the column, which is integrated with the formwork.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a formwork 1 made of a precast hollow section material used in the present invention. The formwork 1 has a rectangular outer circumference and an inner circumference 2 having a cylindrical hollow cross section.

Then, this formwork 1 is placed on the innermost surface of the concrete layer 3.
A plurality of reinforcing fibers M84 extending in the vertical direction are arranged in the circumferential direction, and reinforcing fibers M5 are also spirally wound around the outer periphery of the reinforcing fibers, which are integrated with the concrete layer 3. Further, a recess 2a is formed on the inner periphery of the upper edge of the opening 2, and a protrusion 2b is formed on the outer periphery of the lower edge of the opening 2, making it possible to stack formworks 1 formed in the same shape. ing.

The material constituting the reinforcing fibers 4 and 5 is carbon fiber or [J aramid fiber, and these reinforcing fibers 14.5 are stretched in the circumferential direction due to the lateral pressure of the concrete placed in the open part 2. It has the function of bearing stress and preventing the concrete layer 3 from cracking due to pressure, and also allows the thickness of the concrete layer 3 to be set to be small due to this reinforcing effect.

Next, a method of constructing a concrete column using the formwork having the above configuration will be explained using FIG. 2.

First, as shown in FIG. 2(a), the vertical reinforcements 11a and tie bars 11h that constitute the main reinforcement 11 of the column are assembled on the floor surface 1o, and as shown in FIG. 2(b), The first formwork 1 is inserted from the F section of the main reinforcement 11 and set on the floor surface 1 (L).

Next, as shown in Figure 2 (C), place two
The second formwork 1 is stacked in the same manner. In this way, the formwork 1 is successively piled up so as to cover the outer periphery of the main reinforcing bars 11.

The joint surfaces of the respective molds 1 can be stacked with high precision without being displaced due to the engagement of the concave portions 2a and convex portions 2b.

To install the formwork 1, for example, as shown in FIG. By suspending the frame 1, the tip of the hanging jig 12 does not come into direct contact with the floor surface due to the convex portion 2b, so that it can be hung on the floor surface 1 without any hindrance.
It can be installed on 01.

In addition, when stacking the next formwork 1 on top of the formwork 1 installed in advance, by interposing spaces 1j-13 at the joints, the hanging jig 12 can be removed without any hindrance, making it extremely convenient. Can be stacked without the need for embedded metal fittings.

After stacking each formwork 1, as shown in FIG. Pour concrete.

Although this embodiment describes the case where a plurality of formworks 1 are stacked, this invention can also be applied to the case where a column is constructed using only one formwork 1 having a length from the column base to the bottom of the beam. , of course included.

When pouring concrete, a lateral pressure of -1 concrete is applied inside the opening 2, so the formwork 1 is reinforced from the outside to prevent it from shifting or tilting. Furthermore, tensile stress is generated in the formwork 1 in the circumferential direction, but this is received by the fibrous materials 4 and 5 arranged on the inner circumference.
As mentioned above, the occurrence of cracks can be prevented. In addition, since the inner periphery of the joint portion engages in an uneven manner, leakage of cement paste is reduced by this bent portion, and good pouring is possible.

Then, once the concrete has hardened, the filler 14 is removed. Thereafter, the joints between the formworks 1 are filled with mortar or a sealing material, and finishing such as painting is applied as necessary, thereby completing a concrete column using the formworks 1 as a finishing or finishing base material. It is also possible to fill the seal 1 without removing the filler 14 and reduce the amount of work required by T = 8-.

When a village made of concrete is destroyed, it generally undergoes three-dimensional deformation, and in particular expands outward.
- In the concrete column configured as shown in FIG.
There is a binding that suppresses the elongation in the circumferential direction 1'i due to the expansion and deformation, and a structure that restrains the expansion and deformation.

In addition, the expansion pressure mainly acts on the formwork 1, and stress transmission through adhesion is secondary, and the formwork 1 is integrated into the interior of the concrete 1, and 1iIiN Stress transmission to the materials 4 and 5 is ensured.

Therefore, a reinforcing effect similar to that of a general spiral reinforced column can be obtained.

In particular, if carbon fibers or aramid fibers are used as reinforcement mH4,5, fibers with excellent heat resistance and alkali resistance, physical and chemical stability, and high strength and high modulus of elasticity can be used. The effect can be further enhanced, and the durability is excellent.

In addition, in order to increase the strength of layer 3 to concrete 1,
J frame 1171-1 ~ Even when crepe cattle are raised,
Compound 1i Silk (J has almost no deterioration, has significantly increased strength, and can be made smaller in cross section, so it is advantageous in terms of small opening and price.

In addition, in the first embodiment, 1. t, (11 cross section is square,
Although reinforced concrete 1 and 11 with circular cross-sections are shown, the child shape G1 is particularly limited, and Ll, f,
<, f11 cross section and J: Both the cross sections of the frame may be rectangular bicircular, elliptical, G, II octagonal, etc., and the cross-sectional shapes of the inside and outside of the formwork may be different or the same.

In addition, when constructing columns using steel frames or 1J spiral reinforcing bars instead of reinforcing bars or IJ, or even using a combination of these,
This can be performed using the same procedure as in this example.

(Effects of the Invention) As described above in detail in the Examples, according to the method for constructing concrete]~U according to the present invention, the formwork is used as a permanent formwork (L-L material J, and f1 It can be used as a base shrine for soil, improves strength and toughness, and eliminates the T step.
However, when constructing silk trM: ', 'c are good, I', 'Which of the famous species' excellent medicinal effects are 1/1/.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view showing a formwork made of a hollow cross-sectional material used in the present invention, and FIG. 2(a) is a partial cross-sectional perspective view. (b), (c) 11 η side view showing the order of step 1 of this invention,
Figure 3 shows how to hang the formwork. Part 1 '5) Sectional view, Figure 4 [J! l′! It is a partial sectional view showing the details of the joint part between frames. １・・・・・・・・・Formwork ２・・・・・・・・・
...Opening 3...Concrete layer 4.5...Reinforcement mH1 (1...Floor surface 11...Main reinforcement 11a... Vertical line 1
1b... Obisuji Patent Applicant 71 Co., Ltd. Obayashi Corporation Agent Patent Attorney -1-
Kensuke Iroki Proceedings Negotiations...Author (spontaneous) August 8, 1985 Director General of the Patent Office Mr. Uga Torubu 1, Indication of Cases 1985 Patent Application No. 136847 2, Title of Invention Concrete 1 $1 Construction method 3, relationship with the case of the person making the amendment Patent applicant address 3-37, Kyobashi, Higashi-ku, Osaka-shi, Osaka Name (054) Stock Gold Minister Obayashi Corporation Representative Director Yoshi Obayashi Department 4, resident resident Address: 1-24-16-5 Nishi-Shinbashi, Minato-ku, Tokyo, Column 6 of “Claims” of the specification subject to amendment, Contents of the amendment As per the appendix, Claims (1) Erected reinforcing bars or On the outer periphery of the steel frame, one or more formworks in which long IIH-shaped materials are buried in the vertical and horizontal directions are laminated on the inner surface of a precast hollow section material mainly made of cement-based inorganic material It. A method for constructing a concrete column, characterized by pouring concrete on the inner circumference and integrating the formwork. (2)” - As a miscellaneous material, long! ! 2. The method of constructing a concrete column according to claim 1, wherein carbon fiber or aramid [t] is used. (3")-T Precast 1 - A patent claim characterized in that concrete or mortar made of a cement-based inorganic material constituting the hollow cross-sectional material is reinforced with carbon fiber, aramid mn, glass fiber, or a composite material of these fibers. A method for constructing a concrete column according to claim 1 or 2. (4) A method for constructing a concrete column according to claim 1 or 2, wherein the precast hollow section is A-crepe cured. Two methods of constructing concrete columns as described in the book.

Claims (4)

[Claims] (1) On the outer periphery of the erected reinforcing bars or steel frames, a formwork in which long fiber material is buried in the vertical and horizontal directions is installed on the inner surface of a precast hollow section material mainly made of cement-based inorganic material. 1. A method for constructing a concrete column, characterized by stacking one or more concrete columns, pouring concrete on the inner periphery of the column, and integrating the column with the formwork. (2) The method for constructing a concrete column according to claim 1, characterized in that long fiber carbon fiber or aramid fiber is used as the long fiber material. (3) Claim 1, characterized in that the cement-based inorganic concrete or mortar constituting the precast hollow section is reinforced with carbon fiber, aramid fiber, glass fiber, or a composite material of these fibers.
A method for constructing a concrete column as described in Section 2 or Section 2. (3) A method for constructing a concrete column according to claim 2, characterized in that a long fibrous material is embedded in a spiral shape in the inner periphery of the precast hollow section material. (4) The method for constructing a concrete column according to any one of claims 1 to 3, wherein the precast hollow cross-sectional material is autoclaved.