JPS5927688B2 - Formwork tightening device - Google Patents

Description

Detailed Description of the Invention The present invention relates to a formwork tightening device used in concrete centrifugal casting, etc., and in particular, a hook with a cam surface is moved forward and backward by an operating rod that moves forward and backward in the longitudinal direction of the formwork body. Then, the joined formwork is tightened and released, and at the time of release, the hook is pivoted to one side of the formwork and pulled from the joint of the formwork to release the fresh concrete. Facilitate loading, demolding of finished products, maintenance of formwork, etc.

In the conventional tightening device of this kind, a hook is provided at the joint of two opposed formworks to form the formwork body, and the movement of this hook tightens both formworks. Although this was released, this hook was installed on one side of the formwork, and its end was always thick (protruding) from the other side of the formwork.

Therefore, even when both formworks are separated, the hook installed in one formwork remains protruding outward from the joint of the formwork, so it is difficult to pour fresh concrete into the formwork, This interfered with the demolding work of the finished product, and also with the removal of concrete adhering to the joints of the formwork and with maintenance work.

Furthermore, if the formwork is temporarily placed on the floor with the joints facing downward, the hooks will protrude downward, so the hooks will come into direct contact with the floor and support the weight of the formwork. Therefore, there is a problem that the hook may be deformed and damaged, and the stability of the formwork is not high.

Furthermore, when attaching and detaching the formwork, if you do not hold the formwork while holding it so that it does not tilt, the hooks may get caught on the formwork and the formwork cannot be attached or detached smoothly. Balancing the formwork for a given engagement area is a very difficult task.

This invention was made to eliminate such conventional problems, and its purpose is to store the formwork by retracting the hook into the side of the formwork to which the hook is attached when the formwork is tightened and released. The purpose of this invention is to simplify the structure and make it fully functional even when concrete, etc. is attached.It is also an object of the present invention to facilitate the opening and closing operations of formwork. It's about making it easier.

That is, as in the illustrated embodiment, this application has an elongated formwork body 3 formed by joining a pair of first and second formworks 1 and 2 facing each other, and a slender formwork body 3 formed on the first formwork 1 side. an operating rod 4 which is supported and extends in the longitudinal direction of the form body 3 and moves forward and backward in the same direction;
A hook 6 is provided with a cam surface 5 that presses the second formwork 2 in a direction in which the second formwork 2 approaches the second formwork 2 relatively. The engaging portion I for engaging the cam surface 5 of the hook 6, which has been raised, and the hook 6 in the transition stroke to the other end of the forward and backward stroke.
a swing actuating part 8 that contacts the back of the hook 6 and swings the hook 6 toward the operating rod 4;
A formwork tightening device characterized by comprising a turning position holding part 9 for holding the molds at the turning position is defined as a specific invention, and as a combined invention thereof, a pair of first and second formworks 1, An elongated form body 3 formed by joining 2 facing each other
an operating rod 4 supported on the first formwork 1 side and extending in the longitudinal direction of the formwork main body 3 and moving back and forth in the same direction; A hook 6 equipped with a cam surface 5 that presses the second formwork 2 in a direction relatively close to each other, and a hook 6 provided on the second formwork 2 at one end of the forward and backward stroke of the hook 6 by the operating rod 4. , an engaging portion 1 for engaging the cam surface 5 of the hook 6, and a pivoting operation that contacts the back of the hook 6 and pivots the hook 6 toward the operating rod 4 in the transition stroke to the other end of the advance/retreat stroke. Part 8 and Part 1
A turning position holding part 9 is provided in the formwork 1 and holds the hook 6 at the turning device position, and a turning position holding part 9 is provided in the formwork 1 to hold the hook 6 at the turning device position. To provide a formwork tightening device characterized by comprising a restoring operation part 10 which rotates the formwork 6 toward the second formwork 2 side and restores the formwork.

Next, this invention will be explained according to illustrated embodiments.

First, to explain the structure, numeral 3 is a cylindrical formwork body, which includes a first elongated upper formwork 1 with a semicircular cross section and a gutter-like shape, and a second lower formwork symmetrical to this. This formwork body 3 is used in the centrifugal casting method for manufacturing concrete products such as concrete piles and humid pipes.

The formwork main body 30 and the formworks 1 and 2 are provided with vertical ribs 1L12 for reinforcement along the longitudinal direction at their respective joints.
is fixed.

The formwork 1 has vertical ribs 11, 11 at the joints on both sides.
Further, vertical ribs 12, 12 are fixed to the joints on both sides of the formwork 2 by means such as welding, and by removing the formwork 1 from the formwork 2, the formwork main body 3 is opened. It looks like this.

On the other hand, the form body 3 may be opened and closed by connecting the opposing vertical lips 11 and 12 with a hinge and rotating the form 1 relative to the form 2.

The vertical ribs 11 and 12 are provided with a void 13 extending through them at the same position.

In this embodiment, the void space 13 is formed by holes provided in the vertical ribs 11 and 12, but it may also be formed by four concave portions cut from the side edges of the vertical ribs 11 and 12.

A large number of such spaces 13 are formed along the longitudinal direction of the vertical ribs 11 and 12, and preferably each space 13 is formed at equal intervals.

Engagement portions 7 and 14 are installed on the vertical ribs 11 and 12, respectively, facing the space 13.

The engaging portion 14 is a bracket 14 fixed to the vertical rib 11.
a, a bolt 14b hooked around the bolt 14b, and a roller 14c rotatably supported by the bolt 14b, and a convex portion 14d is formed at the center of the outer peripheral surface of the roller 14c.

Furthermore, the engaging portion 1 is a bracket fixed to the vertical rib 12).
7a, a bolt 7b hooked thereto, and a roller 7c rotatably supported by the pole 7b.

The outer peripheral surface of the roller 7c is a smooth surface. As will be described later, one of these engaging portions 7 and 14 is one that presses against the cam surface 5 of the hook 6, and the other one of the engaging portions 14 presses against the cam surface 5 of the hook 6. Because you will receive power,
The combination of both images 7.degree. 14 may have any structure as long as it can withstand the pressing force or its reaction force.

Therefore, rollers 7c+14c are not necessarily used (
Of course, both are good.

Reference numeral 6 denotes a hook, which is operated by an operating rod 4 carried by the first formwork 1 such that it can move forward and backward in the longitudinal direction thereof.

That is, the operating rod 4 has a threaded groove formed on its outer periphery;
A reciprocating member 15 is fitted on the outer periphery of the reciprocating member 15.
At both ends, nuts 16, 16 are screwed onto the operating rod 4 to position the reciprocating member 15.
is adapted to transmit the movement of the operating rod 4 to the hook 6.

In this embodiment, the hook 6 is attached to a bracket 11 fixed to a reciprocating member 15, and a pivot 1 installed on the bracket 11.
8 and is substantially pivoted to the operating rod 4.

The hook 6 includes an arcuate portion 6a centered on the pivot 18;
A press-contact portion 6b that presses against the advancing/retracting member 15 is formed,
The hook 6 is constructed so that it can pivot counterclockwise in FIG. 3, but cannot pivot clockwise.

10a is a claw formed on the hook 6, and together with an engagement piece 19, which will be described later, constitutes a restoring operation section 10.

Further, a cam surface 5 is formed on the hook 6, and the movement of the hook 6 causes the cam surface 5 to engage with the roller 7C of the second mold 2, thereby moving the rib 12 of the second mold 2 into the other mold. Rib 11 of frame 1
bias toward the side.

At this time, a reciprocating member 15 is engaged with the outer periphery of the roller 14c of the formwork 1, so that the reciprocating member 15 supports the reaction force against the pressing force of the cam surface 5.

A recessed groove 15a is formed in the reciprocating member 15, and a convex portion 14d of the roller 14c is engaged with the recessed groove 15a, thereby preventing the reciprocating member 15 from rotating in the circumferential direction of the operating rod 4.

Note that the contact surface of the roller 14c of the reciprocating member 15 may be a cam surface symmetrical to the cam surface 5.

Such a reciprocating member 15, the hook 6, and the engaging portions 7, 1
4 are arranged corresponding to each empty space 13, respectively.

When using used formworks 1 and 2 that were conventionally tightened with bolts and nuts, these are placed at positions that avoid the mounting positions of the bolts and nuts.

19 is an engaging piece fixed to the rib 12 in the cavity 13, and this engages the back of the hook 6 and moves the hook 6 counterclockwise while the hook 6 is moving to the left in FIG. This engaging piece 19 is engaged by the pawl 10a of the hook 6 while the hook 6 is moving from the left side to the right side in FIG. A restoring operation unit 10 is configured to forcibly turn clockwise to restore the restoring state.

Thus, the restoring actuator 10 is composed of the engaging piece 19 and the pawl 10a, and the engaging piece 19 constitutes a part of the restoring actuating part 10 and the turning actuating part 8.

In addition, as the turning operation part 8, the rib lL facing the empty space 13 is used.
Twelve edges can also be used.

Reference numeral 9 denotes a turning position holding part, which is fixed to the rib 11 and holds the upper end of the hook 6 when the hook 6 turns, as shown in FIG. 6, to maintain the state in which the hook 6 turns counterclockwise. It is for the purpose of

In the figure, 21 and 22 are reinforcing vertical ribs, 23 are reinforcing horizontal ribs, and 24 is a ring that rolls into contact with a drive roller (not shown) to rotate the form body 3. The ring 24 includes the operating rod 4 and the advancing/retracting member 1.
5. Be careful not to interfere with the engaging parts 7, 14 and the hook 6.
Form a suitable cutout.

25.26 is Patsukin and Al. Next, the effect will be explained.

First of all, since the operating rod 4 is long in the axial direction,
When this is pulled, the elongation differs greatly between the tightened side and the opposite side, the loosened side.

Therefore, a predetermined tensile force is applied to the operating rod 4 in advance to measure its elongation, and then each reciprocating member 15 is arranged in anticipation of the elongation of each portion of the operating rod 4 in the axial direction, and two nuts 16 and 16 are respectively arranged. They are each clamped and secured to the operating rod 4 by.

For example, suppose that when a predetermined tensile force is applied to the operating rod 4 of a certain length, the tension side end stretches by 10 m, and the slack side end stretches by one length, and the adjacent pair of engaging parts 7゜140 When the spacing between each combination is equal to 500wn, the distance between the centers of the advancing and retracting members 15 at the loose end is 499 mm, and the distance between the centers of the advancing and retracting members 15 at the tightening end is 499 mm. It is as follows.

In order to tighten both formworks 1 and 2, it is sufficient to move the operating rod 4 to the right in FIGS. 1 and 3.

Various means of transportation can be employed.

For example, when using a precast jack or when towing with other towing devices.

When the operating rod 4 is moved to the right in FIGS. 1 and 3, the hook 6 is simultaneously moved to the right together with the reciprocating members 15 fixed to the operating rod 4.

At this time, the reciprocating member 15 is guided by the rotation of the roller 14c, and the cam surface 5 of the hook 6 is guided by the rotation of the roller 7c to move to the right as described above.

The cam surface 5 urges the roller 7c upward while rotating, and the reaction force is supported by the reciprocating member 15 that rolls into contact with the roller 14c.
The distance between the vertical ribs 11 and 12 is pushed closer together, and both formworks 1 and 2 are tightened.

When the operating rod 4 moves to the right, the roller 7c
Due to the reaction force from
A force to rotate clockwise around point 8 is input, but
Since the pressing portion 6b of the hook 6 is pressed against the reciprocating material 15, the hook 6 presses the roller 7c toward the first formwork 1 with its cam surface 5 without turning.

In addition, when the rollers 7c, 14c are not used for the engaging parts 7, 14, the engaging bodies 7, 14, the cam surface 5, and the reciprocating member 1
The contact with 5 is a sliding contact.

Thus, by tightening the molds 1 and 2 at various locations in the longitudinal direction of the vertical lips 11 and 12, the mold main body 3 rotates and centrifugal casting is carried out.

In this case, since each advancing/retracting member 15 is attached in anticipation of the expansion of the operating rod 4, the degree of engagement between the engaging portion 7 of each part and the cam surface 5 can be set equally, so that both formworks 1
, 2, it is possible to tighten with substantially the same tightening force from the tightening side where the tensile force is applied to the opposite end.

(Thus, the long formworks 1 and 2 can be compacted evenly from one end to the other in the longitudinal direction, and particularly large formworks can be compacted effectively.

Moreover, when opening both the formworks 1 and 2, the operating rod 4 may be moved in the opposite direction to that described above.

This movement can be carried out using jacks or other traction means as described above.
Or by means of impact force.

Then, the cam surface 5 separates from the roller 7c and the hook 6
When moving to the left end side in FIG. 3 within the space 13, if the space between both vertical ribs lL12 is widened, both formworks 1.2 are opened.

Therefore, all that is required is to demold the internal concrete product and prepare for the next molding.

When the operating rod 4 moves to the left in FIG. 3, the back of the hook 6 hits the turning actuating portion 8 consisting of the engagement piece 19 in the middle of the movement.

On the other hand, since the hook 6 has an arcuate portion 6a, the hook 6
abuts on the turning operation part 8, and can easily turn counterclockwise in FIG. 3 about the pivot shaft 18.

Due to this rotation, the entire hook 6 moves toward the first formwork 1 side, is retracted into the first formwork 1 side, and becomes thick (not protruding) toward the second formwork 2 side.

Then, by further moving to the left, when the end of the leftward movement is reached, the pivoting position holding portion 9 comes into contact with the pressure contact portion 6b of the hook 6, thereby maintaining the pivoting state of the hook 6.

At this time, the claw 10a of the hook 6 is engaged with the engagement piece 19.

This is the state shown in FIG.

Therefore, as described above, both formworks 1 and 2 may be opened, the product may be demolded, the formworks 1.degree. 2 may be maintained, and concrete may be filled for secondary molding.

Next, when tightening both formworks 1 and 2, the operating rod 4 is moved to the right in FIG. 6.

As a result, the press-contact portion 6b of the hook 6 separates from the rotation position holding portion, and since the claw 10a of the hook 6 is engaged with the engagement piece 19, the hook 6 is forced to move due to the rightward movement of the pivot 18. Then, it is rotated clockwise about the pivot 18, protrudes toward the second mold 2, and returns to its original state.

Even without the aforementioned action of the restoring actuator 10 consisting of the pawl 10a and the engaging piece 19, in the normal case, if the operating rod 4 moves to the right, the hook 6 will rotate as described above under its own weight, but the concrete Even if the hook 6 loses its turning smoothness due to adhesion, etc., the above-mentioned action of the restoring actuator 10 allows the hook 6 to rotate smoothly.
is forcibly rotated and restored.

Then, by continuing to move to the right with the hook 6 protruding toward the second formwork 2 side and restored, the first and second formworks 1 and 2 are tightened as described above. Eggplant.

According to the present invention, when the first and second frames are released, since the hooks have turned toward the first formwork, the hooks are turned toward the second formwork (thick). Nothing stands out.

Therefore, the hooks do not get in the way of various operations such as maintenance and inspection of the first and second formwork, demolding of concrete products, filling with concrete, and opening and closing of the formwork. This has the effect of ensuring smoothness.

Furthermore, even if the first formwork provided with hooks is hung and placed on the floor with the hooks facing downward, the hooks do not protrude significantly from the first formwork. There is no risk of the hooks supporting the weight of the formwork and damaging it, and the formwork is also more stable on the floor.

Furthermore, according to the present invention, the structure is simple and each component does not make subtle movements, so smoothness of operation is not impaired even by adhesion of concrete.

In particular, due to the presence of the restoring actuating section, the hook is forced to make a restoring turn, so that the tightening work of the formwork can be carried out reliably.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention;
Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is an enlarged view of the main part of Figure 1, Figure 4 is a sectional view taken along the line IV-IV in Figure 3, and Figure 5 is a sectional view taken along the line IV--IV in Figure 3. , FIG. 3 is a sectional view taken along the line v-v in FIG. 3, and FIG. 6 is an enlarged view of the main part showing the rotating state of the hook. In the figure, 1 is the first formwork, 2 is the second formwork, 3 is the formwork body, 4 is the operating rod, 5 is the cam surface, 6 is the hook, I is the engagement part, and 8 is the turning operation. , 9 is a turning position holding section, and 10 is a restoring operation section.

Claims (1)

[Scope of Claims] An elongated formwork body formed by joining a pair of first and second formworks facing each other, and an elongated formwork body supported on the first formwork side and extending in the longitudinal direction of the formwork body. an operating rod that moves forward and backward in the same direction, a hook that is pivotally attached to the operating rod and has a cam surface that presses the second formwork in a direction in which both formworks approach each other relatively; An engaging part provided on the second formwork for engaging the cam surface of the hook at one end of the forward/backward stroke, and an engaging part that contacts the back of the hook at the transition to the other end of the forward/backward stroke. a turning actuating part for turning the hook toward the operating rod side; and a turning actuating part provided in the first formwork,
1. A formwork tightening device comprising: a pivoting position holding section that holds the hook at the pivoting position. 2. A long and slender formwork body formed by joining a pair of first and second formworks facing each other; a hook that is pivotally connected to the operating rod and has a cam surface that presses the second formwork in a direction in which both formworks approach each other relatively; , an engaging portion of a retainer provided on the second formwork that holds the cam surface of the hook, and a hook that touches the back of the hook in the transition stroke to the other end of the advance/retreat stroke to move the hook toward the operating rod side. A turning operation part for turning, and provided in the first formwork,
A turning position holding part that holds the hook at the turning position, and a restoring part that engages with the hook in the transition process of the advancing and retracting stroke to the engaging part side and turns the hook to the second formwork side and restores it. A formwork tightening device comprising: an actuating part;