JPH06288090A - Structure for mounting form - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Abolishing the reinforcement work in a narrow space to reduce the supporting materials. [Structure] A plurality of ladder-shaped bodies in which a pair of parallel-arranged steel aggregates 1 are connected by connecting members at a plurality of positions so as to maintain a constant mutual interval are arranged in parallel, and within a distance between the steel aggregates. Reinforcing bars 6 and 7 are arranged to form a structure for mounting a formwork, which is relocated to the site and the formwork is attached to it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a formwork used in a narrow space where the workability of the formwork is poor.

[0002]

2. Description of the Related Art As a formwork method for placing web concrete with a box-shaped cross-section girder found in many prestressed concrete cable-stayed bridges, a formwork on both sides of the wall is used as in the case of construction of general concrete walls. A method of connecting with a foam tie or a separator, or a method of further providing a supporting material in the space of the box-shaped cross section girder is common.

[0003]

[Problems to be Solved by the Invention] The main girder (box-shaped girder) of a prestressed concrete cable-stayed bridge is constructed so that the force exerted by its own weight acting on the main girder or the load on the vehicle is transmitted to the cable diagonally. A cross girder in the direction perpendicular to the bridge axis is provided at the portion connected to the material cable. Therefore, after completion, the box-shaped cross-section girder is almost closed space not only in the lateral direction but also in the longitudinal direction, leaving a manhole. Became narrower, and it was difficult to carry out various works at the tip of the bridge girder, which would be carried through the space.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to reduce various works in such a narrow place, and a pair of steel aggregates arranged in parallel has a constant interval. It is a structure for mounting a formwork in which a plurality of ladder-like bodies connected by connecting members at a plurality of positions are arranged in parallel so as to be held in the .

The formwork-attaching structure of the present invention is preassembled as a structure on a bridge surface or on the ground where construction has been completed, is transferred to a predetermined place, and the formwork is attached to the steel frame surface of the structure. That is, the formwork-attaching structure of the present invention is a reinforcing bar cage that is firmly constituted by the steel aggregate and the connecting material, and also functions as a form tie and separator for the formwork.

According to the present invention, since the work of arranging can be performed in an environment where it is easy to work, it is possible to work with high accuracy and efficiency. Further, since the formwork is attached to the rigid structure of the present invention and can take a firm formwork reaction force, it is possible to greatly reduce or abolish the support material for the space inside the box-shaped section girder. . Further, the mold can be easily attached and detached, and the mold construction can be speeded up.

In the above description, the formwork construction in the box-shaped cross-section girder space is cited, but this is an example, and instead of work in places where workability is poor, the formwork installation of the present invention is carried out. Structure is used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

1A and 1B show an example of a structure for mounting a mold according to the present invention. FIG. 1A is a plan view and FIG. 1B is an elevation view.

2A and 2B show an example of the structure of the connecting member used in the present invention and the structure of the connecting portion. FIG. 2A is a vertical sectional view and FIG. 2B is a perspective view of each part.

A connecting hole 15 is bored at a predetermined position of the groove-type steel aggregate 1, and a steel rod bolt 4 is passed through the steel pipe 2, the connecting hole 15 and the bush 3 while sandwiching the steel pipe 2 having a predetermined length, and both ends are formed. Are tightened with nuts 5 to connect the pair of groove-type steel aggregates 1. The pair of groove-type steel aggregates 1 are connected to each other at upper, middle and lower positions. The steel pipe 2 serves as a separator and the steel rod bolt 4 serves as a foam tie. The two formed ladder-shaped bodies are arranged in parallel, the main horizontal reinforcing bars 6 are fixed to predetermined positions using the steel pipe 2, and then the vertical reinforcing bars 7 are fixed to the horizontal reinforcing bars 6. Thus, the rigid formwork mounting structure shown in FIG. 1 is constructed. The groove-type steel aggregate 1 may be provided with a protrusion such as a stud dowel for the purpose of facilitating the work of arranging the reinforcing bar and improving the fixation with concrete.

FIG. 3 shows an example in which a formwork is attached to the formwork mounting structure of the present invention.

(A) is a perspective view showing a state in which the formwork is attached to the formwork mounting structure and concrete is placed therein,
(B) is a perspective view of the attachment part of a formwork.

The mold mounting bolts 12 are connected to the steel rod bolts 4 of the mold mounting structure by using a coupler. Form 8 with cutouts 9 at required points on the mounting end
Is set and tightened and fixed with a nut 12 via a pressing member 10 and a fixing plate 11.

At this time, the formwork mounting bolts 12 were connected to the steel rod bolts 4 by a coupler, but when constructing the formwork mounting structure, a longer steel rod bolt 4 was used, and a groove was formed in the middle thereof. If it is connected to the mold steel aggregate 1 and a mold is attached at the end, the connection by the coupler can be omitted. As the bolt, a screw cap rebar or screw cap PC steel rod may be used. In FIG. 3, a grooved steel is used as the steel aggregate 1, and the so-called buried mold in which the steel aggregate 1 is buried in concrete after the mold is removed from the mold is illustrated, but the present invention is not limited to this. It is also used as a so-called diversion mold, in which is removed from concrete and reused. An example thereof is shown in FIG. FIG. 4A is a perspective view of a state in which the formwork is attached to the formwork mounting structure and concrete is placed, and FIG. 4B is a perspective view of the steel aggregate 1 at that time. T-shaped steel is used as the steel aggregate 1,
A connecting hole 15 is provided through the rib. The T-shaped steel is used to form a formwork-attaching structure in the same manner as the buried die, and the formwork 8 is attached. When the mold is removed from the mold, the bolt is loosened to remove the mold, and then the bolt connecting the steel aggregate 1 is loosened to remove the steel aggregate 1. In order to facilitate the removal of the steel aggregate 1, it is preferable to provide chamfering members 14 on both end faces of the steel aggregate 1 on the concrete side.

[0016]

EFFECTS OF THE INVENTION Since the work can be done in an environment where it is easy to work instead of working in a narrow space, it is possible to work accurately and efficiently. Further, since the formwork is attached to a rigid structure and can take a firm formwork reaction force, it is possible to greatly reduce or completely eliminate the supporting material in the narrow space. Further, the mold can be easily attached and detached, and the mold construction can be speeded up. When applied to the inner web of a multi-chamber box-shaped cross-section girder, there is no risk of corrosion of steel aggregates and steel pipes due to rainwater.

[Brief description of drawings]

FIG. 1 shows an example of a formwork mounting structure of the present invention,
(A) is a plan view and (b) is an elevation view.

2A and 2B show an example of a structure of a connecting member and a structure of a connecting portion used in the present invention, FIG. 2A is a longitudinal sectional view, and FIG. 2B is a perspective view of each component.

FIG. 3 (a) is a perspective view showing a state in which a mold is attached to a structure for mounting a form and concrete is placed therein;
(B) is a perspective view of the attachment part of a formwork.

[Explanation of symbols]

1 ... Steel aggregate, 2 ... Steel pipe, 3 ... Bushing, 4 ... Steel rod bolt, 5 ... Nut, 6 ... Horizontal rebar, 7 ... Vertical rebar, 8 ... Formwork, 9 ... Frame notch, 10 ... Pressing material, 11 Fixing plate, 12 Formwork mounting bolt,
13 ・ ・ Nut, 14 ・ ・ Chamfering material, 15 ・ ・ Connecting hole

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 shows an example of a formwork mounting structure of the present invention,
(A) is a plan view and (b) is an elevation view.

2A and 2B show an example of a structure of a connecting member and a structure of a connecting portion used in the present invention, FIG. 2A is a longitudinal sectional view, and FIG. 2B is a perspective view of each component.

FIG. 3 (a) is a perspective view showing a state in which a mold is attached to a structure for mounting a form and concrete is placed therein;
(B) is a perspective view of the attachment part of a formwork.

FIG. 4 (a) is a perspective view showing a state in which the formwork is attached to the formwork mounting structure and concrete is placed therein;
(B) is a perspective view of the iron aggregate at that time.

[Explanation of code] 1 ・ ・ Steel aggregate, 2 ・ ・ Steel tube, 3 ・ ・ Bushing, 4 ・ ・ Steel bar bolt, 5 ・ ・ Nut, 6 ・ ・ Horizontal rebar, 7 ・ ・ Vertical rebar, 8 ・ ・ Form , 9 ... Formwork cutouts, 10 ... Pressing material, 11 ... Fixing plate, 12 ... Formwork mounting bolts,
13 ・ ・ Nut, 14 ・ ・ Chamfering material, 15 ・ ・ Connecting hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimichi Ichinomiya 2-19-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Hiroshi Shinbo 2-19-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Center

Claims (1)

[Claims] 1. A plurality of ladder-shaped bodies in which a pair of parallel-arranged steel aggregates are connected to each other by connecting members at a plurality of positions so as to maintain a constant interval therebetween, and the intervals between the steel aggregates are arranged. Formwork mounting structure with reinforcing bars inside