JP3148138B2 - Mounting method of PC formwork in driving formwork method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving formwork method in which concrete is added to an existing concrete wall surface by using a PC formwork, and the PC formwork is left as a facing surface. The present invention relates to an improvement in a technique for joining a separator and a PC form to keep the same constant.

[0002]

2. Description of the Related Art As a prior art of a method of mounting a PC formwork in a driving formwork method, a technique disclosed in Japanese Patent Application Laid-Open No. 7-300870 developed by the present applicant has been known. The technique disclosed in this publication is based on a technique of disposing a base end side of a separator provided with a positioning fitting on a tip end side, and inserting the tip end of the separator into a hole formed in a PC form in advance, while positioning the fitting. The positioning of the PC form is performed by bringing the PC form into contact with the.

[0003]

However, in this conventional method, it is necessary to arrange the separators while keeping the mounting accuracy, such as the horizontality and the linearity, of the separator extremely high.
At the actual construction site, it is very difficult and time-consuming to attach the separator with high precision, and if even one of the separators is misaligned, the PC form is moved to a desired position. Can not be placed accurately.

Therefore, when there is such a deviation, it is necessary to temporarily stop the work of arranging the PC form each time, adjust the position of the corresponding separator again, and then perform the work of mounting the PC form again. However, due to the weight of the PC formwork, this was a very time-consuming task.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to simplify a PC frame with respect to a mounting bracket of a separator even if the arrangement position of the separator is slightly deviated. The PC form in the driving form method, which can be easily engaged by the dropping, and can easily adjust the positional accuracy of the PC form after the PC form is engaged with the tip of the separator. An attachment method is provided.

[0006]

Means for Solving the Problems To achieve the above object, according to the first aspect of the present invention, a PC form is arranged on the front surface of an existing concrete wall via a separator,
In a driving form method in which concrete is poured between the PC form and the existing concrete wall surface and integrated,
While a receiving bracket is provided on the distal end side of the separator having the base end side fixed to the existing concrete wall, a connecting bracket engaged with the receiving bracket is provided on the inner surface of the PC form facing the existing concrete wall. Provided so as to protrude, dropping the connecting fitting onto the receiving fitting when the PC form is arranged,
The PC mold is locked so as to be position adjustable in the front-rear and left-right directions, and the connecting fitting and the receiving fitting are connected and fixed by grouting with a grout agent.

According to the first aspect of the present invention, the PC
The connecting fittings on the PC form side are hooked into the receiving fittings on the separator side and temporarily fixed by the dropping operation of the form form. In this state, the PC form is shifted to the front or back or left and right to position it at a predetermined position. Adjust and secure with grout. Therefore, a large clearance (play) between the receiving metal fitting and the connecting metal fitting can be obtained when the PC formwork is mounted, so that the mounting operation can be performed easily and quickly.

Here, as described in claim 2, it is preferable that the receiving member is formed in a box shape having an open upper surface, and the receiving member is filled with a grout agent in advance.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 4 show the construction procedure of the present invention. First, in FIG. 1, reference numeral 1 denotes an existing concrete wall, and this existing concrete wall 1 constitutes a retaining wall in the case of underground external wall construction, for example, and is additionally provided with a wall for seismic reinforcement. In the case of work to be done, it is an existing skeleton concrete wall.

[0011] A large number of holes 2 for fixing the separator are vertically and horizontally formed in the existing concrete wall 1 at predetermined intervals.
The base of the separator 3 is inserted through a grouting agent such as an epoxy resin filled in the hole 2, and the concrete wall 1
Then, a reinforcing bar 4 is arranged vertically and horizontally on the front surface of the concrete wall 1.

The above procedure may be performed before or after, and the separator 3 may be attached after the reinforcing bars 4 are arranged. Although FIG. 1 shows a state in which the separators 3 are arranged at one place, a large number of separators 3 are actually provided at predetermined vertical and horizontal intervals.

[0013] Thereafter, a receiving bracket 6 is attached to a protruding end of the separator 3 from the outer reinforcing bar 4 via a seating plate 5. The seating plate 5 is supported on both sides by longitudinal bars of the outer reinforcing bar 4, and has a center formed with a positioning hole 5 a for inserting the separator 3 therethrough.

The receiving bracket 6 is of a box type having an open top surface, and has a hole 6a for penetrating the separator 3 formed on one side surface thereof. By tightening with 7, the separator 3 is positioned and fixed to the tip of the separator 3. FIG. 2 shows the mounting state.

On the other hand, P facing the existing concrete wall 1
An inverted L-shaped connecting fitting 9 is fixed to the inner wall surface side of the C-shaped frame 8 at a position facing the receiving fitting 6. In this example, an anchor bolt 10 and a nut 11 projecting from the inner wall surface of the PC form 8 are fixed as shown in FIG.
However, other fixing means can be used.

As will be described before and after, the spacing between the separators 3 can be set according to the spacing between the connecting fittings 9 on the PC form 8 side, or the spacing between the separators 3 can be determined according to the spacing between the separators. It is also possible to determine the arrangement interval of the connecting fittings 9 on the mold frame 8 side.

After the above preparation work is completed, grouting agent 12 such as mortar or low-viscosity epoxy resin is filled into receiving metal fitting 6, and then P is cured before this grouting agent 12 is cured.
If the C-shaped frame 8 is suspended, the connecting fitting 9 is positioned so as to be directly above the receiving fitting 6 as shown in the figure, and then the hanging, the connecting fitting 9 is dropped into the receiving fitting 6 as shown in FIG. And engage in a hook shape.

At this time, the clearance (play) between the receiving fittings 6 and the connecting fittings can be increased even if the positions of the receiving fittings 6 and the connecting fittings 9 are slightly shifted.
When the mold 8 is lifted and dropped, they do not interfere with each other, and the engaging work can be performed easily and quickly. Thereafter, as shown by the arrow in FIG. 3, the PC form 8 is moved back and forth and left and right to perform fine position adjustment, whereby accurate positioning of the PC form 8 can be easily and quickly performed. In addition, if the positioning of the PC form 8 is accurately performed at the time of dropping, it is not necessary to adjust the position after dropping.

In this state, if the PC form 8 is temporarily fixed while maintaining its verticality and left as it is, the grout 12 hardens as time passes, and the receiving fitting 6 and the connecting fitting 9 are connected to the grout. As a result, the PC mold 8 is completely connected by the hardening, and the positioning and connecting work of the PC form 8 is completed.

Thereafter, when concrete C is poured between the existing concrete wall 1 and the PC form 8, the two are integrated, and a new concrete wall having the PC form as a surface as shown in FIG. 4 is completed. Will do.

[0021]

As is apparent from the above description, in the method for mounting a PC form in the driving form method according to the present invention, relative to the receiving fitting on the separator side and the connecting fitting on the PC form side. Even if there is some deviation in the position,
By simple dropping work of the PC formwork, the receiving fittings and the connecting fittings can be easily and quickly engaged to be temporarily fixed and connected, and in this temporarily fixed state, the position of the PC formwork can be easily adjusted with high precision. It can be carried out. Therefore, according to the present invention, the mounting work is significantly simplified as compared with the conventional method, and the work can be shortened as much as possible.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first step of a mounting method according to the present invention.

FIG. 2 is a partial sectional view showing the next step.

FIG. 3 is a partial cross-sectional view showing a next step of the above.

FIG. 4 is a partial sectional view showing a final step of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing concrete wall 3 Separator 6 Receiving bracket 8 PC formwork 9 Connecting bracket 12 Grout agent

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Inside the Obayashi Corporation Technical Research Institute (72) Haruka Ogawa 4-640 Shimoseido Shimito-shi, Tokyo (72) Inventor Ichifusa Mitani 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd.Obayashi Corporation Technical Research Institute (72) Inventor Masayuki Tanaka 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi-gumi Co., Ltd. Tokyo head office (56) References JP-A-6-74746 (JP, A) JP-A-6-1767547 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/02 E04B 2/86 611

Claims (2)

(57) [Claims] 1. A driving formwork method in which a PC form is arranged on a front surface of an existing concrete wall via a separator, and concrete is poured between the PC form and the existing concrete wall to integrate them. While a receiving bracket is provided on the distal end side of the separator having the base end side fixed to the existing concrete wall, a connecting bracket engaged with the receiving bracket is provided on the inner surface of the PC form facing the existing concrete wall. When the PC form is arranged, the connecting fitting is dropped onto the receiving fitting, and the PC forming form is locked so as to be adjustable in front and rear and right and left, and the connecting fitting and the receiving fitting are connected to each other. A method of attaching a PC form in a driving form method, wherein the PC form is fixed by binding with a grout agent. 2. The mounting of a PC formwork in the driving formwork method according to claim 1, wherein the receiving fitting has a box shape with an open upper surface, and the receiving fitting is filled with a grout agent in advance. Method.