JP2011026777A - Pneumatic form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of causing such a fault that concrete is easily chipped at an acute angle part because a construction joint face end of precast concrete is left in acute angle shape in the prior art and providing the skeleton side face (the easily chipped acute angle part) with an additionally placed part (a bulged part) to provide a construction joint results in costing much for joint treatment, additionally placed concrete, etc. <P>SOLUTION: This pneumatic form used for a construction joint partition face of concrete includes a plurality of air tubes 1 with bag parts 3 sewn to the air tubes 1 at both ends 8 at least to store joint strips 2 longitudinally. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of a pneumatic formwork used for a joint portion in a concrete work such as a building or civil engineering work.

In concrete construction of a concrete structure, a joint part and an additional part (hereinafter collectively referred to as joint parts) are usually performed on a horizontal plane and a vertical plane. In particular, the processing of the vertical joint portion often requires a great deal of labor, and the joint portion that is not subjected to an appropriate treatment causes structural problems such as cracks.
In the present invention, “joining” means that concrete is newly poured into the concrete end face after the concrete has hardened.
Conventionally, in a vertical joint of ordinary concrete, a flexible tube called an air fence is used, and after this air fence is installed vertically in the formwork that has been laid, the tube is filled with air. It is used to stop the placed concrete by expanding and expanding the air fence and blocking the end face of the joint.
Further, as another means, it is implemented by using a retaining mold having a mesh such as a lath. In this case, if it is ordinary concrete, the amount of the concrete leaking from the mesh of the lath form is only small during vibration compaction.
However, in high fluidity concrete, the original purpose of leaking over a long time and stopping the concrete is not achieved.
In order to solve these problems, when a high-fluidity concrete is to be handed over or added to a vertical surface, a fixing formwork having a mesh is fixed to the jointed part or the part to be added, and a beam main bar is attached to the back side. Avoiding the contact with the steel plate, installing an air fence composed of a plurality of air tubes on the back of the steel plate, and filling the air tube with air before placing the high fluidity concrete (for example, see Patent Document 1) ) Exists.

Japanese Patent Laid-Open No. 2000-27439 (refer to the claims, detailed description of the invention, and FIGS. 1 to 4)

In the prior art, when a high-fluidity concrete is handed over or added to a vertical surface, a fixing mold having a mesh is fixed to the jointed part or the part to be added, and a steel plate is avoided on the back side of the main reinforcing bar. A concrete stopping method is disclosed in which an air fence made of a plurality of air tubes is installed on the back surface of the steel plate, and the air tubes are filled with air before placing the high-fluidity concrete.
However, in the prior art, a stop mold having a mesh and a steel plate on the back of the stop mold are required, and an air fence made of an air tube is further installed to prevent leakage of high-fluidity concrete. This is uneconomical because it requires more man-hours and components. In order to make this cheaper, if only the air fence is used except for the stop formwork and steel plate having a mesh, the end face of the jointed part of the precast concrete remains in an acute corner shape, so that the concrete is lost at the sharp corner portion. There is a drawback that it becomes easier. In addition, in order to prevent the sharp corners that are easily damaged, it is possible to increase the cost and cost of joint processing by providing additional punching parts (fracture parts) on the side of the housing (the sharp corners that are easily damaged) and joint joints. There was a problem that the cost of the cast concrete would be high.
The present invention solves these problems, and in a pneumatic structure used for a jointing partition surface of concrete with an air fence installed at a joint part with a simple configuration, at least the air tubes at both ends are in the longitudinal direction. The present invention provides a pneumatic formwork comprising a plurality of air tubes, characterized in that a bag portion for storing a joint rod is sewn into the bag.

A first invention of the present invention for solving the above-mentioned problems is a pneumatic mold as described in claim 1, and is as follows.
In a pneumatic mold used for a concrete joint partition surface, at least air bags at both ends are sewn with bag portions for storing joint rods in the longitudinal direction.

A second invention of the present invention for solving the above-mentioned problems is a pneumatic mold as defined in claim 2 and is as follows.
In the pneumatic formwork used for the jointing partition surface of concrete, a joint rod having a release material is directly attached to the air tube at least at both ends in a portion in contact with the placed concrete in the longitudinal direction.

Since the pneumatic mold according to the present invention has the configuration as described above, the following effects can be obtained.
(1) Since the side end portion of the precast concrete does not have an acute angle, the concrete is difficult to break.
(2) Since it is not necessary to perform additional cast concrete (fukashi concrete) and a concrete frame can be formed, man-hours can be reduced and it is economical.
(3) By removing the air pressure in the air tube, the mold can be easily removed, no foreign matter remains in the housing, and the strength of the joint and the durability of the building can be maintained.

It is a principal part schematic plane sectional view which shows the 1st Example of the pneumatic formwork of this invention. It is a principal part schematic sectional drawing which shows the 1st Example of the pneumatic formwork of this invention. It is a principal part schematic plane sectional view which shows the 2nd Example of the pneumatic formwork of this invention. FIG. 4 is a modified example of the second embodiment of the pneumatic mold according to the present invention, in which (a) is an example in which a release paper is provided on a joint rod and directly attached to an air tube, and (b) is a concrete peel on the joint rod. This is an example in which an easy resin is coated and directly attached to the air tube. It is a principal part schematic plane sectional view which shows the conventional pneumatic formwork. It is explanatory drawing which shows a mode that the precast concrete shown in FIG. 5 of the conventional pneumatic formwork was laid. It is a perspective view which shows a mode that the precast concrete was laid in the Example of the conventional pneumatic formwork.

  In the pneumatic formwork used for the jointing partition surface of concrete, it is a pneumatic formwork comprising a plurality of air tubes sewn with bag portions for storing joint rods in the longitudinal direction at least at the air tubes at both ends.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.
First, the prior art will be described with reference to FIGS.
As shown in Fig. 6 and Fig. 7, it is constructed using the pneumatic formwork used for the joints of pressure panels, beams, walls and slabs in concrete work. Explaining the type of mounting in the longitudinal direction, the joint position is confirmed after the bar arrangement 10 is completed, the base is assembled by using the reinforcing bar 11, the wire (welding), etc., and between the upper and lower bar lines, and Install the air tube from the bottom line below (fogging part) by using it sideways and make the air pressure about 50% to 60% so that it does not collapse.
After this attachment is completed, 100% air is injected at an air pressure of 0.7 to 0.9 kg / cm ² . In addition, lay a slap mat on the top end, place the thick corners, etc., and fix it with a wire bundle to finish the top end.
Then, the air in the air tube is reconfirmed, and the concrete for casting is placed. After the cast concrete has hardened, remove the valve core, remove the reinforcing bars, completely drain the air in the air tube using vacuum, etc., and pull out the air tube to complete the work.
Next, what is constructed using a pneumatic formwork used for the joint part of walls and beams will be described.
After completing the bar arrangement, check the joining position before installing the formwork. Then, the base is assembled using reinforcement bars 11, wire (welding), etc., the air tube is inserted between the main bars and the main bars in the vertical direction, dropped to the beam bottom, and the air is put in the range of 50% to 60%. Adjust the gap, etc., and finally inject 100% air pressure at 0.7-0.9 kg / cm ² . Double check the air pressure in the air tube and place the joint concrete.
After the concrete is hardened, the valve core is removed, and then vacuuming is used to completely remove the air in the air tube and pull it out from the upper part of the beam.
However, in this conventional construction method, as can be understood from FIG. 5, the concrete that has been placed in advance at both end portions 8 has an acute angle, and the acute-angled portion tends to be lost.
A gap is formed between the missing portion and the concrete to be succeeded later, and this portion becomes weak in strength.

The present invention was invented to eliminate the loss of the precast concrete, and is as described below.
As shown in FIG. 1 and FIG. 2, a bag portion 3 that can accommodate a rectangular cross section or a square joint rod 2 is formed on an air tube 1 that is disposed at least at both end portions by sewing or bonding. Before inserting the joint rod 2 into the bag 3, a plurality of air tubes 1 are sequentially arranged in the joint portion, and the air tube 1 that is an air fence (pneumatic formwork) is filled with air. 1, when the prior placement concrete 4 is placed as shown in FIG. 1, the end portion is stopped by the flat portion of the joint rod 2 and the acute angle portion is not formed. It is.
Since not only the air tubes 1 disposed on both side end portions but also all or appropriate intervals, the acute angle portions can be further reduced, so that defects are eliminated.
Therefore, when the subsequent casting concrete 5 is cast, since the preceding casting concrete 4 has no defect, the strength is extremely reduced.

Next, a second embodiment will be described with reference to FIGS.
The difference from the first embodiment described with reference to FIGS. 1 and 2 is an embodiment in which the joint rod 2 is provided on the air tube 1 via the bag portion 3, but this second embodiment is different from the first embodiment in the air tube 1. The joint rod 2 is directly attached, and at least when the pneumatic formwork is removed by interposing the release material 6 on the joint rod 2 surface on the preceding placement concrete 4 side, Since other specific configurations and operations are the same as those of the first embodiment, detailed description thereof is omitted.
4 (b) employs a covering material 7 made of a synthetic resin material having a peelable property for the joint rod 2 and directly adheres to the air tube 1 as in FIG. 4 (a). To form.

The construction method using the pneumatic formwork according to the present invention described above can be set at the joining portion while feeding air to the tube, and when removing the mold, the formwork can be easily pulled out.
In addition, the pneumatic formwork of the present invention can be reused many times, and the conventional cost, water stoppage, drainage, concrete finish, concrete adhesion, and workability (before placing and after placing) are conventional. Excellent compared to the construction method. And since the acute angle part of a joint part is not formed, since concrete does not lose | delete, there exists an outstanding effect that it is not necessary to provide an additional striking part (fuzzy part) on the side of a housing.

  It can also be used for strength-separated jointed concrete for column, beam and wall joints.

1. Air tube
2 ... Joint rod 3 ... Bag part
4 .... Preceded concrete placement 5 .... Concrete concrete placement
6... Release material 7... Cover material 8... Both ends 9.

Claims (2)

In the pneumatic formwork used for the jointing partition surface of concrete, the pneumatic type consisting of a plurality of air tubes, characterized in that at least the air tubes at both ends are sewn with bag portions for storing joint rods in the longitudinal direction. Formwork. In a pneumatic formwork used for a concrete joint partition surface, a plurality of joints having a release material are directly attached to a portion in contact with the placed concrete in the longitudinal direction at least on the air tubes at both ends. Pneumatic formwork consisting of air tubes.

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