JPH0344481Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is applicable to formwork used for forming concrete members such as concrete segments.
This invention relates to a formwork fastener for fastening adjacent surrounding frames to each other.

PRIOR ART The peripheral frame of a form used for molding concrete members is generally openable and closable, or can be divided into a plurality of pieces, in order to facilitate demolding.
When using such formwork, it is necessary to tighten the surrounding frame, but the fasteners used to tighten the formwork can cause wear on the contact surface of the formwork and vibrations during concrete pouring. A structure is required to prevent concrete from leaking from the formwork contact area due to expansion and contraction of fasteners.

Conventionally, adjacent formworks were tightened using clips or bolts and nuts, but the tightening force may loosen due to wear on the contact surface of the formwork, or over-tightening may occur due to individual differences in the case of bolts and nuts. Not only did concrete leakage occur due to damage to the formwork or insufficient tightening, but also the tightening work required time and effort.

Purpose of the invention The present invention was devised in view of the above-mentioned circumstances, and it is an object of the present invention to provide a formwork clamping tool that can reliably tighten the formwork with simple operation and that allows fine adjustment of the clamping width. With the goal.

Structure of the invention This invention relates to a formwork fastener that fastens adjacent surrounding frames to each other in the molding of concrete members such as concrete segment cement. ,
An auxiliary member is provided protruding from the other side, and a holder having a substantially U-shaped cross section is rotatably attached to the bracket by pivoting its two parallel left and right surfaces, and the bracket and auxiliary member are attached to the holder. An arm that can span both sides is rotatably attached by pivoting its base end to the two parallel left and right surfaces of the pedestal, and the auxiliary material is tightened to the tip of the arm so as to press it against the bracket side. Screwing a width adjustment bolt, and attaching the tightening adjustment bolt and the mounting pin of the bracket and arm so that they are aligned substantially in a straight line with the formwork fastened,
The above object is achieved by forming the clamping side of the cradle to be approximately parallel to the line connecting the bracket and the mounting pin of the arm, and further providing a retainer for the bolt for tightening width adjustment on the auxiliary material. It is something.

Embodiment Hereinafter, this invention will be explained based on an illustrative embodiment.

The brackets 4, 4 are substantially trapezoidal members whose bases are somewhat wider than their tips, and holes 41 through which the mounting pins 1 are inserted are bored at the tips.
Each bracket has two formworks H,
At the end 9 of one formwork H', holes 4 are formed parallel to each other at intervals that sandwich the pedestal 3, which will be described later.
1 and 41, their bases are welded so that their centers are aligned. At this time, each bracket is welded to the formwork end 9 so that when the mounting pin 1 is passed through the holes 41, 41, the mounting pin 1 is positioned parallel to the abutting end surfaces of the formwork H, H'. Ru.

The pedestal 3 has a substantially U-shaped cross section, and holes 31, 31 through which the mounting pin 1 is inserted are bored in two opposing parallel surfaces 3b, 3b, respectively. In addition, the hole 3
Pin holes 32, 32 adjacent to and opposite to 1, 31
is drilled. The pin holes 32, 32 are positioned so that a line connecting their centers and the center of the mounting pin 1 is approximately parallel to the holding side 3a of the pedestal 3.

This pedestal 3 is fitted between the brackets 4, 4, and is rotatably supported by the mounting pin 1. Moreover, when the mounting pin 8 is inserted into the holes 32, 32,
Mounting pin 8 is positioned parallel to mounting pin 1.

The arm 2 has a substantially U-shaped main body, with an operating part 2a having a hole 21 formed in the longitudinal direction and a supporting part 2b having a hole 22 formed in the thickness direction facing each other. Rib 2c with arcuate sides to increase strength
The overall shape is approximately U-shaped. The actuating part 2a and the supporting part 2b form a formwork holding part 7 facing each other. A tightening width adjusting bolt 5 is screwed into the hole 21 through a mounting nut 6 welded to the outer surface of the actuating portion 2a so as to be accessible toward the support portion 2b, and penetrates into the formwork holding portion 7.

The support portion 2b is connected to two parallel surfaces 3b, 3 of the pedestal 3.
b, and is rotatably supported by the pedestal 3 by inserting the mounting pin 8 into the hole 32.

In addition, when the formwork is tightened, the tightening width adjustment bolt 5,
The mounting pin 1 and the mounting pin 8 are arranged substantially in a straight line. Furthermore, the holding portion 3a of the pedestal 3 is formed substantially parallel to the mounting pins 1 and 8 of the arm 2 and the pedestal 3.

Next, a formwork fastening operation using this fastener will be explained.

In the embodiment shown in FIG. 2, the formworks H and H' are tightened and connected at the corners where they intersect at right angles. The brackets 4, 4 of the fastener A have an end surface 9a at the end 9 of the formwork H that is perpendicular to the contact surface 9b with the formwork H'.
are attached in the longitudinal direction of the end of the formwork. Also,
At the end 9' of the formwork H', a spacer 1 is attached to the end surface 9a'.
An auxiliary material 11 that protrudes beyond the end surface 9a of the formwork H is welded to the formwork H through the auxiliary material 11. Bolt 5 of auxiliary material 11
A protrusion 12 is formed on the contact side.

First, the arm 2 is rotated in the direction of the arrow around the mounting pin 8, and the actuating part 2a is placed on the contact surface 9 of the formwork H.
b to a position where it is substantially in line with b, and the contact surface 9b' of the formwork H' is brought into contact with 9b.

Next, when the arm 2 is moved in the direction perpendicular to the formwork H while returning to its original position, the mounting pin 8 rotates around the mounting pin 1 together with the pedestal 3.
The state will be as shown by the two-dot chain line in the figure. At this time arm 2
An auxiliary material 11 is located within the formwork holding part 7.

Thereafter, the arm 2 is moved to a position where the tightening width adjusting bolt 5 contacts the auxiliary member 11. With the tightening width adjustment bolt 5 hooked on the protrusion 12, the pedestal 3 is rotated in the direction of the arrow around the mounting pin 1 using a bar member, and the auxiliary material 11 is attached to the formwork H via the spacer 10. It is in a state where it is gripped by the fastener A fixed to. At this time, the formworks H and H' are fastened together at their contact portions via the auxiliary material 11.

When the formwork is tightened, the tightening width adjustment bolt 5, mounting pin 1, and mounting pin 8 are aligned approximately in a straight line, and the tightening force is maximum when the three are aligned in a straight line. (See Figure 2). At this time, pedestal 3
If you further rotate in the direction of the arrow and adjust the tightening width so that the mounting pin 1 is located slightly toward the outer side of the arm than the tightening width adjustment bolt 5 and the mounting pin 8, the mounting pin 8 will fit into the cradle. 3 to be hooked onto the mounting pin 1, which prevents the arm from coming off naturally after tightening.

To release the formwork tightening, use a bar member to rotate the pedestal 3 in the opposite direction of the arrow to release the mounting pin 8.
rotates together with the pedestal 3 in the opposite direction to the arrow shown in the figure around the mounting pin 1, and the tip of the bolt 5 for adjusting the tightening width of the arm actuator is separated from the auxiliary material, so the tightening force is automatically released. be done.

In the embodiment shown in FIG. 3, the abutting ends 9, 9' of the molds H, H' are formed into plate shapes.
The formworks H and H' are fastened and connected with their contact surfaces 9b and 9b' in contact with each other. At this time, bracket 4 of fastener A,
4' is attached to the end surface 9a of the plate-shaped end 9 of the formwork H on the opposite side to the contact surface 9b in the length direction of the formwork end 9. Further, a notch may be provided at the intersection of the cast iron arm mold clamping portions 7 of the end portions 9 and 9'.

FIG. 4 shows the state in which the fastener is installed in this embodiment. In this case as well, the tightening work is performed in the same manner as in the previous embodiment, but since the fastener A directly tightens the formwork itself, the tightening is reliable.

In both embodiments, if the formwork connecting end is long, a plurality of fasteners are attached and tightened at appropriate intervals.

Note that the interval at which the auxiliary material 11 is held is determined by adjusting the length of the tightening width adjusting bolt 5 protruding into the formwork holding part 7 in advance according to the tightening strength, and by adjusting the abutting surface of the formwork and Even if the tightening strength is loosened due to wear of the auxiliary material, the tightening width adjustment bolt 5 can be used to adjust the tightening width.

In addition, by using a highly rigid member such as a cast member for the arm 2, it is possible to prevent concrete from leaking from the formwork due to the expansion and contraction of the fastener, especially the arm member itself, due to vibrations during concrete pouring. I can do it.

Effects of the invention The formwork fastener of the invention having the configuration described above has the following effects.

Since installation and removal are extremely easy, the formwork can be easily disassembled.

The tightening width can be adjusted in advance to prevent over-tightening or under-tightening. In addition, in the unlikely event that concrete leaks,
Tightening adjustment is easy, and the tightening width can also be finely adjusted.

Since there are no parts such as a handle attached to the cradle of the fastener for the purpose of rotating it, it can be manufactured extremely compactly and at a lower cost since there are fewer parts. You can also do it.

In addition, since it has an extremely compact structure without being bulky, it can be installed without difficulty even in narrow spaces where formwork parts are crowded.

In addition, as mentioned earlier, the fastener holder has
Since no parts such as handles are attached, and the structure is as compact as possible, even if vibration is applied to the formwork, there is no worry that it will resonate and increase the vibration. The bolt is provided with a retaining portion such as a protrusion to prevent the tightening width adjusting bolt from coming off after tightening, so that the tightening width adjusting bolt can be reliably fixed after tightening.

Furthermore, the bolt for tightening width adjustment and the mounting pin of the pedestal and arm are installed so that they are located approximately in a straight line so that when the formwork is fastened, the force of fastening the formwork by the arm is maximized. It is possible to securely and firmly connect formwork to each other.

Therefore, there is a risk that the bolts for tightening width adjustment, the mounting pins of the cradle and the arm, and the arm may come loose or come off, or the formwork may disintegrate due to the impact during concrete pouring or the vibrations caused by the vibrator. Not at all.

In addition, the pedestal is formed into a substantially U-shaped cross section, and the gripping sides of the pedestal are formed approximately parallel to the mounting pins of the pedestal and the arm, so even if the pedestal is formed on the small side, it will not be difficult to receive the pedestal. Sufficient space can be secured between the left and right sides of the stand, the clamping side, and the mounting pin to insert a rod member in place of the handle.

Therefore, the cradle can be easily rotated by inserting a rod between the left and right sides, the clamping edge, and the mounting pin, and using this rod as a handle (see Figure 5), so there is no need to attach a handle. Nor.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the fastener, Figs. 2, 3, and 4 are diagrams showing the state in which the fastener is installed.
FIG. 5 is a diagram showing a method of rotating the pedestal. 1... Mounting pin, 2... Arm, 3... cradle,
4...Bracket, 5...Tightening width adjustment bolt,
6...Mounting nut, 7...Form holding part, 8...Pin, 9...Formwork end, 10...Spacer, 11
...Auxiliary material, 12...Protrusion.

Claims (1)

[Scope of claims for utility model registration] (1) A bracket,
An auxiliary member is provided protruding from the other side, and a holder having a substantially U-shaped cross section is rotatably attached to the bracket by pivoting its two parallel left and right surfaces, and the bracket and auxiliary member are attached to the holder. An arm that can span both sides is rotatably attached by pivoting its base end to the two parallel left and right surfaces of the pedestal, and the auxiliary material is tightened to the tip of the arm so as to press it against the bracket side. Screw the width adjustment bolts together, and install the tightened width adjustment bolts and the mounting pins of the bracket and arm so that they are aligned approximately in a straight line with the formwork fastened, and then tighten the clamping sides of the pedestal. A formwork fastener, characterized in that it is formed substantially parallel to a line connecting the mounting pins of the bracket and the arm. (2) The formwork tightening tool according to claim 1 of the utility model registration, characterized in that the auxiliary material is provided with a portion to prevent the bolt from coming off for adjusting the tightening width.