JPH07100964B2 - Intersection binding support for PC version sheath - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support for binding the intersections of sheaths contained in a prestressed concrete (hereinafter referred to as PC) plate.

[0002]

2. Description of the Related Art Conventionally, various types of binding tools for binding the intersections of reinforcing bars and the like arranged in concrete are known. They are steel wires and steel plates that are bent, and are clips that are assembled at the intersections by utilizing elasticity, and binding materials that are made of a flexible material such as plastics. These are manually assembled, and the binding has a small binding force, and it suffices to prevent the displacement of the reinforcing bars and the like until the concrete is placed.

Japanese Utility Model Application Laid-Open No. 59-136817 discloses a clip having locking portions bent at the opposite sides at both opposite parallel ends. This clip is a connection clip formed by bending a steel plate, and has insertion slits formed in both ends of the main body in a direction orthogonal to the longitudinal direction. Since this clip binds the reinforcing bars only by the elasticity of the steel plate, if it is used as a sheath tying tool in the case of casting concrete with a small slump such as a PC plate, it will collapse, twist, or come off. Difficult to hold unity.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an intersection binding support for a PC plate sheath, which meets the following requirements, unlike the conventional binding tools described above. (1) As in the case of a PC plate paving plate, a sheath for PC steel materials should be arranged in a grid pattern over a vast area, and the many intersections can be reliably bound in a short time.

(2) Since concrete is rapidly constructed in sequence, rapid construction is required according to the process. For this reason, it is preferable that the sheath can be bound from above and that the structure can be machined. (3) When pouring concrete, a large force is applied from the lateral direction, causing it to fall or twist, and there is a danger of it coming off, so it must be firmly assembled.

(4) The lower surface of the sheath is also used as a spacer for securing a concrete cover to improve work efficiency and save materials.

[0007]

DISCLOSURE OF THE INVENTION The present invention is an Ω-shaped forming body of an elastic plate, which has a U-shaped notch cut from the open side of the Ω-shape in the Ω-shaped wall. The innermost part of the notch and the Ω-shaped envelope form a binding part, which binds the intersecting points of two sheaths orthogonal to each other and closes this open part to the open part of the Ω-shaped leg part. A cross-section binding support tool for a PC plate sheath, which is provided with a closing mechanism for fixing the same and has a height at which the Ω-shaped legs form a spacer.

In this case, the closing mechanism is a stepped projection protruding from one wall of the Ω-shaped leg portion toward the other wall, and a hole provided in the other opposing wall. Is preferably formed by a combination of holes having locking pieces that are locked to the stepped portion by elastic deformation when they penetrate. Further, if a steel plate is used as a plate having elasticity and an integrated press-molded body is used, it can be mass-produced at low cost, and it is easy to impart appropriate elasticity.

[0009]

With the above construction, the intersection binding support of the PC plate sheath according to the present invention produces the following operation. (A) By covering the intersection of the orthogonally arranged sheaths with this support from above and operating the closing mechanism of the leg in one operation, reliable binding of the intersection can be facilitated, and at the same time the concrete cover under the sheath is covered. It is possible to easily form a spacer for ensuring the above.

(B) The mounting work efficiency is dramatically improved. Furthermore, large-scale sequential construction by mechanization becomes possible. (C) Hold the concrete without causing it to fall or twist. (D) Therefore, it contributes to the overall rationalization of a large-scale construction process of PC version pavement and the shortening of the construction period.

[0011]

1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a PC.
It is a perspective view which shows the state which united the intersection of a plate sheath. The intersection binding support tool 1 is an example manufactured by bending a steel plate. This steel plate is a thin plate made of a highly elastic material. The end face of the formed overall shape is an Ω shape, and the plate width (length perpendicular to the end face of the Ω shape) is 2 to 2.5 times the diameter of the sheath.

[0012] Fig. 1 is drawn in a posture in which two horizontally stacked sheaths that are orthogonal to each other are covered and pushed down from above. In the posture shown in FIG. 1, the intersection binding support of the PC version sheath of the embodiment is in an upright state of Ω shape. The embodiment of FIG. 1 comprises a top plate 2, both wall plates 3, legs 4, and a bottom plate 5. The lower part of both wall plates 3 is narrowed to a narrow width, and the top plate 2 and both wall plates 3 are Ω.
It forms a letter envelope.

The side plate 3 is provided with a notch 6 into which the upper sheath 30 of the orthogonal sheath to be bound is fitted. Cutout 6
Since it goes to the bottom plate 5, this embodiment is in the form of a four-legged horse. This support can be fitted by pushing it in from above the sheaths 30 and 31 which are horizontally arranged in a grid pattern. Inside the side plates 3 on both sides, the lower sheath 31
Is held. For this reason, the lower portion 7 of the Ω-shaped envelope portion of the wall plate 3 forms a curved surface so as to hold the lower surface of the sheath.
It is more preferable to provide the lip 8 that presses the lower sheath 31 from the side so that the displacement of the sheath can be prevented. The leg 4 is configured so that both the lower legs of the Ω shape are brought close to each other and the open portion of the Ω shape is closed. By this closing, the sheaths 30 and 31 are firmly bound.

An example of the closing mechanism will be described with reference to FIG.
One leg 4 of the Ω shape is provided with a projecting piece 11 that projects toward the other leg 4. The projecting piece 11 is formed such that the tip thereof is thin and gradually becomes thicker to reach the maximum dimension and is stepped to have a constant thickness. A hole 13 is provided in the other leg of the projecting piece 11 which faces the other. The size of the hole 13 is the protrusion 11.
Is larger than the tip and smaller than the maximum dimension of the step portion. The edge of the hole 13 is pushed by the side surface of the projecting piece 11 and elastically deforms to pass the maximum dimension part of the step of the projecting piece 11, and after this part passes, the step 12 is locked to project. A locking piece 14 is formed by the slit 15 so that the piece 11 does not come out.
The projecting piece 11 also elastically deforms when entering the hole 13,
It is preferable that after the maximum dimension portion of the step portion passes, the step portion is elastically deformed and the step portion is locked by the locking piece 14 so as to prevent the step from coming out. This closing mechanism can be formed from a single plate by pressing, as can be easily seen from FIG. The closing mechanism is not limited to this example, and any other snap mechanism or locking mechanism may be used as long as it can be easily closed and does not come out thereafter.

The binding support of the embodiment has a large number of through holes 9 to prevent the flow of concrete during concrete pouring.
Is provided. The method of mounting the intersection binding support 1 of the embodiment is as follows. (A) The binding support 1 is covered from above on the intersection of the sheaths 30 and 31 which are arranged orthogonally in a plane on the PC plate construction surface.

(B) While slightly lifting the sheaths 30 and 31, the bundling support 1 is pushed down so that the notch 6 holds the sheath 30 and the Ω-shaped envelope part holds the sheath 31, and then the leg parts are snapped with a snap tool. Close the opening of. (C) Lower the lifted sheath and set it in the proper position. As described above, the intersections are tightly bound and the sheath is accurately lifted from the lower surface by the amount of the concrete cover and set by the spacer.

After placing concrete and curing it, PC is used for the sheath.
By inserting a steel material and introducing prestress to the concrete, the production of a PC plate with excellent performance is completed. The example is for construction of a PC paving slab on an airfield, in which sheaths are orthogonally arranged at intervals of 30 cm and have a width of 7.5 m and a length of 10.
Partially adopted for 0m pavement. As a result, the present binding support tool enables smooth construction without hindering the work process of the automatic concrete placing device.

[0018]

EFFECTS OF THE INVENTION According to the cross point binding support for the PC plate sheath of the present invention, a large area PC plate can be constructed in a short period of time. The unity is strong, and it does not fall down, twist, or come off, it can be attached with one touch, and construction is easy and mechanized construction is also possible.

The sheath also functions as a spacer and can hold the sheath in an accurate position. Also, it does not hinder the flow of concrete during concrete pouring.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a perspective view of the embodiment after construction.

[Explanation of symbols]

1 Bundle Supporting Tool 2 Top Plate 3 Wall Plate 4 Legs 5 Bottom Plate 6 Notch 7 Lower 8 Lip 11 Projecting Piece 12 Steps 13 Hole 14 Locking Piece 15 Slit 30, 31 Sheath

Front Page Continuation (72) Inventor Koichi Kitamura 4056 Sakuradai, Nakatsu, Aikawa-cho, Aiko-gun, Kanagawa Nihon Hatsujo Co., Ltd. (56) References

Claims (3)

[Claims] 1. An Ω-shaped forming body of a plate having elasticity, which has U-shaped notches formed on both side walls of the Ω-shaped from the opening side of the Ω-shaped, and the deepest part of the U-shaped notch and the above-mentioned. The Ω-shaped envelope part forms a binding part that binds the intersection of two orthogonal sheaths.
An intersection binding support tool for a PC plate sheath, comprising: a leg mechanism open portion having a closing mechanism for closing and fixing the open portion, and the Ω leg portion having a height forming a spacer. 2. A stepped protrusion protruding from one wall of the Ω-shaped leg portion to the other wall, and a closing mechanism provided on the other opposing wall, and elastically deforming when the protrusion penetrates. The intersection binding support device for a PC plate sheath according to claim 1, characterized in that it comprises a hole having a locking piece for locking the stepped portion. 3. The cross-point binding support tool for a PC plate sheath according to claim 1, wherein the elastic plate is a steel plate and is made of an integral press-molded body.