JPH0686764B2 - Flap material connecting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a concrete formwork capable of freely increasing and decreasing the length and width dimensions.

(Prior Art) Conventionally, a formwork used for pouring concrete is generally made of a lightweight steel or the like in a single material or in parallel to form a buttery material, and the buttery materials are joined in a grid pattern vertically and horizontally. The clapboard is attached to these flaps to form them, but the size of the formwork, that is, the length and width, must be set according to the construction object. Therefore, as the single material of the flap used for the formwork, several kinds of standard lengths such as 2m, 3m, and 5m are prepared, and the standard length flaps have the required length and width. When assembling into the mold, a plurality of standard length flaps are used in a lap joint, and the length of the lap is adjusted to increase or decrease to match the shape of the mold.

(Problems to be Solved by the Invention) The lap joining of flutter materials in the above-mentioned form has conventionally been performed by a simple connecting means such as sandwiching two flutter materials with a washer. The lap joint is
From a structural mechanistic point of view, it is a discontinuous part of the beam, it is almost impossible to transmit stress to each other, and the strength and rigidity of the formwork itself are low, but there are problems of various sizes. It has been considered unavoidable from the economical point of view if the destined flap material is repeatedly used for the formwork. Therefore, since the conventional mere flap having a lap joint structure is discontinuous as a beam, the flutter of the formwork is structurally calculated as a set of simple beams.

In recent years, the formwork technology is shifting to a method of hanging a crane or moving wheels, but in that case, in order to prevent a large heavy frame from breaking from the overlapping part of the flap material during handling, There is a demand for strengthening the frame strength, and as a countermeasure against this, it is the current situation to use long continuous flaps without overlapping parts by cutting and aligning them according to the size of the form or welding and joining them. is there. Since such a seamless flutter can be treated as a continuous beam supported by many fulcrums, the strength and rigidity of the form become significantly high, and the amount of bending of the flutter during concrete placement (form Although there is an advantage that the amount of bending can be kept low,
It is uneconomical to cut and align the flap material in accordance with the size of the mold, or to weld and join the mold, resulting in a large increase in the cost of the mold.

The present inventor has been researching and developing a large-sized movable formwork for many years, but in order to construct a large-sized frame that is lightweight, easy to handle, and has high strength and rigidity, cuts or welds a fixed-sized flap material. We devise a very simple and inexpensive method for joining flapping materials without damaging the flapping material, without leaving a process such as splicing, leaving a discontinuity in the joint to an arbitrary length. This has been a major issue.

What is considered to be the best as the stretchable beam material for the flap material is to join the flap materials so that their axial centers coincide with each other. It has a structure that allows large and small diameter steel pipes to be taken in and out. However, in this structure, a step is formed at the joint portion and a gap is formed between the dam and the small diameter pipe portion, which requires a lot of time and labor for the treatment and is not practical. Therefore, as shown in FIG. 4, we have studied in the direction of making an expandable beam with a structure in which single flap materials 1a and 1b are superposed. The problem with this structure is the misalignment of the axes. As a member for connecting the single flaps 1a, 1b to each other, the single flaps 1a, 1b as shown in FIG.
A pair of eyeglass-like connecting tools 12 having square holes 5a, 5b through which the respective holes can be inserted are prototyped. As shown in FIG.
Experiments were carried out on a joint structure using 2 ', 12 ". In this case, there is some play between the inner dimensions of the square holes 3a, 3b and the outer dimensions of the single flap material 1a, 1b so that they can slide. Therefore, the rattling of applying the load P is bothered, and as shown in FIG. 6, a bent shape is shown at the joint portion, and a satisfactory result cannot be obtained.

The deviation of the axial center due to the overlapping as described above causes a twisting force in the flap material. As shown in FIG. 7, one flutter single material 1b generates a force that pushes the connecting tool 12 'in one direction (downward) as indicated by the arrow, and the other reaction causes the other flutter single material 1a to move in the opposite direction. A pushing force is generated (upward), and these two forces act as a moment M'to try to rotate the connecting tool 12 'in the direction of the arrow, so that a torsional stress is generated in the butter members 1a, 1b. .

INDUSTRIAL APPLICABILITY The present invention can solve the problems of bending and torsional stress in a flap material having a structure formed by overlapping and joining the flap materials as described above, and is excellent in strength and rigidity, and has a simple structure and low cost. It is an object of the present invention to provide a flutter material connecting device capable of easily joining and adjusting expansion and contraction.

(Means for Solving the Problems) In the present invention, as the stretchable structure of the flap, the flaps are slidably and fixedly overlapped and spliced together, and an eyeglass-shaped connector is used for this. is necessary.

Further, as a measure for preventing the torsional stress due to the non-coincidence of the axial center of the single flutter material, the single flutter materials are joined together by a plurality of connecting members 12 ', 12 "(see FIG. 6). A moment M'acts in the direction indicated by the arrow in FIG. 7 at one coupling 12 ', while a moment M "in the opposite direction acts at the other coupling 12' as shown in FIG. That is, the moments M ′ and M ″ cancel each other out. Therefore, unless the deviation of the axial center of the single butterflies to be joined is made particularly large, the load is shared with the weir plate and other butterflies, so that there is no practical problem. In this case, it is necessary that the cross-sectional shape of the single flap material is rectangular, and it is inconvenient for the circular flap.

Next, with respect to the problem of bending of the flap material, the flap material and the insertion hole of the connector must be joined together without any gap. In that case, it is not advisable to add a processing such as a bolt hole to the flap material. Therefore, it is necessary to provide a push screw on the connecting tool to firmly bond the single flap material and the connecting tool.

Thus, according to the present invention, as shown in FIGS. 1 and 2 corresponding to the embodiment, the two square holes 5a, 5a, 1b for inserting the single flakes 1a, 1b are inserted.
5b are arranged in parallel to each other to form a spectacle frame shape, and push-fastening bolts 7 and 7 that can freely move back and forth in the respective square holes 5a and 5b are screwed into the frame body 3 to form the connector 2, In the square holes 5a, 5a, 5b, 5b of the connecting tools 2, 2 arranged in plural, the butter materials 1a, 1b having a rectangular cross section are formed.
Insert side by side, tighten the push bolts 7,7, and
It is characterized in that 2,2 and the single grass material 1a, 1b are bonded to each other.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, 1a and 1b are connecting butter materials,
Lightweight square tubes are used. Reference numeral 2 is a connecting tool for connecting the flap materials 1a and 1b. As shown in the figure, the flap material is formed on a rectangular frame 3 as a whole and through a partition wall 4 provided at the center. Square holes 5a and 5b, which are respectively inserted through 1a and 1b, are formed in parallel. Then, the frame body 3 has screw holes 6,
6 is provided, and push bolts 7 and 7 are respectively screwed into this,
The tip portion thereof can project into the square holes 5a and 5b.

The flutter materials 1a and 1b are combined by using a plurality of the above-mentioned connecting tools 2. That is, as shown in FIG. 1 and FIG. 2, for example, two connecting tools 2, 2 are arranged at a required interval, and one of the pair of square holes is connected to one of the square holes 5a, 5a. Insert the other flap material 1a, and also insert the other flap material 1b into the other square holes 5b, 5b, screw the push bolts 7, 7, and push the flap material 1 at its tip.
The a and 1b are pressed and fixed.

The flutter material connecting device of the present invention is configured as described above, and can be applied to the connection of various kinds of flutter materials such as horizontal flutter and vertical flutter that support the mold. An example of this will be described with reference to FIG. 3. In the vertical flap 8, two flaps 1a and 1b are juxtaposed and joined by fasteners 9, 9 such as washers and bolts and nuts. On the other hand, the horizontal flap uses the flap materials 1a and 1b combined according to the present invention. The horizontal flutters are arranged in parallel at an upper and lower interval, and are fixed at the intersecting points of the vertical flutter 8 by a fastener or the like. And
The dam 10 is fixed and erected on the corner lateral flaps by using the fixtures 11 and 11 to form a form. In this case, the length of the horizontal flap can be changed by changing the length of the overlap at the connecting portions of the joined flap materials 1a and 1b, and therefore, the length of the form can be changed in the length direction of the horizontal flap. It can be changed to some extent.

(Effects of the Invention) As described above, in the flap material connecting device of the present invention, two square holes through which the flap material is inserted are formed in parallel with each other to form a spectacle frame, and each frame member has A push bolt that can be freely moved back and forth is screwed into the square hole to form a connecting tool, and a butter material with a square cross section is inserted in parallel into each square hole of the connecting tools arranged at intervals to push the bolt. Since the connector and the single material of the flap are connected to each other by tightening, the following many excellent effects are obtained.

(1) Since the connector has a structure in which a pair of square holes are formed by providing a partition wall on a rectangular frame, strength and rigidity are high, and a push bolt is screwed into each square hole. It is possible to firmly tighten the flap material inserted in the hole and fix it without loosening, and against twisting of the flap material or bending as shown in the sixth due to the fact that the axes of the flap materials to be joined are separated from each other,
You can resist enough.

(2) Since the joining of the flapping material by the connecting tool can be performed only by passing the flapping material through the square hole and tightening the push bolts, not only the coupling work of the flapping materials is extremely easy, but also the flapping materials can be freely connected to each other. Since they can be connected at the points, it is possible to arbitrarily form the flap material, which is a standard length material, into a required length without cutting.

(3) Since the flutter material itself does not need to be processed to fix, for example, screw holes or notches, the strength of the flutter material is not reduced.

(4) Since the flap material does not have to be discarded, the flap material is extremely less worn and the material can be saved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the apparatus of the present invention, FIG. 2 is a front sectional view of the same, FIG. 3 is a side view showing an example of a mold using the present invention, and FIG. Fig. 5 is a plan view for explaining the beam by Fig. 5, Fig. 5 is a sectional view of the same, Fig. 6 is a side view showing the loaded state of the beam in Fig. 4, and Figs. It is a front sectional view explaining twist. 1a, 1b …… Flap material, 2 …… Couplings 3 …… Frame, 5a, 5b …… Square hole 7 …… Set screw, 8 …… Vertical flap, 10 …… Weir board

Claims (1)

[Claims] 1. A pair of square holes for inserting a single piece of flap are formed in parallel to each other to form a spectacle frame, and a push bolt which is freely movable into and out of each square hole is screwed to the frame body. Inserting the butter material with a rectangular cross section in parallel into each square hole of the connecting tool that constitutes the connecting tool and arranged at intervals, tighten the push bolts, and then connect the connecting tool and the butterfly single material to each other. A flap material connecting device characterized by being connected.