JPS5831707A - Clamping device for formwork - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork tightening device used in centrifugal casting of concrete, etc., and in particular, a hook with a cam surface attached to an operating rod that moves back and forth in the longitudinal direction of the formwork body. is moved forward and backward to tighten and release the joined formwork, while at the time of release, the hook is pivoted to one side of the formwork and retracted from the joint of the formwork, Facilitates the loading of fresh concrete, demolding of finished products, maintenance of formwork, etc.

In the conventional tightening device, a hook is provided at the junction of two opposing 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 largely protruding toward 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, It interferes with the demolding work of the finished product, and
This became an obstacle to the removal of concrete adhering to the joints of the formwork and maintenance work. Furthermore, if the formwork is temporarily placed on the floor with the joints facing downward, the hooks will protrude downward, allowing the hooks to 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 retaining section is a very difficult task.

This invention was made to eliminate such conventional problems, and its purpose is to pull 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 facilitate storage, maintenance, and removal of adhering concrete.The purpose of this invention is to simplify the structure so that it can function satisfactorily even when concrete, etc. is attached.Furthermore, the purpose of this invention is to facilitate the opening and closing of formwork. The purpose is to facilitate operation.

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 an elongated formwork body 3 on the first formwork 1 side. An operating rod 4 is supported and extends in the longitudinal direction of the form body 6 and moves forward and backward in the same direction;
A hook 6 equipped 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 retaining portion 7 that engages the cam surface 5 of the hook 6 and the transition to the other end side of the forward and backward stroke move the hook 6 with a wing.
a swing actuating part 8 that contacts the back of the hook 6 and swings the hook 6 toward the operating rod 4;
As a specific invention, there is provided a formwork tightening device characterized by comprising a turning position holding section 9 for holding the 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, extending in the longitudinal direction of the formwork body 3 and moving back and forth in the same direction;

A hook 6 equipped with a cam surface 5 that presses the second mold 2 in the direction in which the molds 1 and 2 approach each other relatively, and a second mold Frame 2
A retaining part 7 is provided to engage the cam surface 5 of the hook 6, and a retaining part 7 is provided to engage the cam surface 5 of the hook 6, and in the transition process to the other end of the advance/retreat stroke, the hook 6 is brought into contact with the back part of the hook 6 to move the hook 6 toward the operating rod 4 side. Electricity is provided to the turning operation part 8 for turning and the first formwork 1,
The turning position holding part 9 holds the hook 6 at the turning device position and engages with the hook 6 in the transition process of the advancing and retreating stroke to the holding part 7 side, and moves the hook 6 to the second formwork 2 side. A restoring operation part that rotates and restores the original state.

To provide a formwork tightening device specially composed of 10.

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 producing concrete products such as concrete piles and tumulus pipes by joining the frame 2 facing each other.

Both formworks 1.2 of the formwork body 3 are provided with reinforcing layers 9 and vertical lips 11, 1 along the longitudinal direction at their respective joints.
2 is fixed. Vertical ribs 11.11 are fixed to the formwork 1 at the joints of both sides 9111, and vertical ribs 12, 12 are fixed to the joints on both sides of the formwork 2 by means such as welding. By removing the formwork 1 from the formwork 2, the formwork body 6 is opened. Alternatively, the form body 3 may be opened and closed by connecting one of the opposing vertical ribs 11 and 12 with a hinge and rotating the form 1 relative to the form 2.

The vertical lips 11 and 12 are provided with a void 16 at the same position that passes through them. In this example, the void space 13 is formed by a hole provided in the vertical ribs 11, 12, but it may also be formed in a concave portion cut into a concave shape from the side edge of the vertical ribs 11, 12. A large number of such cavities 16 are formed along the longitudinal direction of the vertical ribs 11 and 12, and preferably 13 cavities are formed at equal intervals.

Retaining portions 7 and 14 are installed on the vertical lips 11 and 12, respectively, facing the space f6. The retaining part 14 is composed of a platen 14a' fixed to the vertical rib 11, a platen 14b stretched over the platen platen 14b, and a roller 14c rotatably supported by the platen platen 14b. A convex portion 14d is formed at the center of the surface. The engaging portion 7 includes a platen 7a fixed to the vertical rib 12, a platen 7b stretched over the platen platen 7b, and a roller 7c rotatably supported by the platen platen 7b. The outer peripheral surface of the roller 7c is a smooth surface.

As will be described later, one of these retaining parts 7 and 14 is a part of the cam surface 5 of the hook 6, and the other part 14 is a part of the pressure welding part. Since it will receive a reaction force, the rain unit 7 14 only needs to have a structure that can withstand the pressure contact force or the reaction force. therefore,
Not necessarily roller 7c.

Of course, it is not necessary to use 14'c.

Reference numeral 6 denotes a hook, which operates on the operating rod 4 carried by the first formwork 1 so as to be freely movable forward and backward in the longitudinal direction thereof. That is, the operating rod 4 has a threaded groove formed on its outer periphery, and the advancing/retracting member 15 is fitted onto the outer periphery.
At both ends of the advancing/retracting member 15, the operating rod 4 is connected (Narrow)16.
16 are screwed together to position the reciprocating member 15, and the retracting member 15 transmits the movement of the operating rod 4 to the hook 6. In this embodiment, the seven hooks 6 are pivotally connected to a bracket 17 fixed to the reciprocating member 15 by a pivot shaft 18 installed on the bracket 17, and are substantially pivotally connected 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 7-piece 6 is configured so that it can turn counterclockwise in FIG. 3, but cannot turn clockwise. 1
0a is a claw formed on the hook 6, and together with a retaining 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 cam surface 5 engages with the roller 7c of the second formwork 2 due to the movement of the hook 6, and the lip 12 of the formwork 2 is moved from the other side. It is urged to approach the lip 11 side of the formwork 1. 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 to prevent the retracting member 15 from rotating in the circumferential direction of the operating rod 4. 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 seven hooks 6', the engaging part 7,
14 are arranged corresponding to each empty space 13, respectively. Formwork 1
．． When using second-hand bolts and nuts that were tightened with conventional bolts and nuts, these should be placed in a position that avoids the mounting position of the bolts and nuts.

19 is a retaining piece fixed to the lip 12 within the space 13;
This constitutes a turning actuating part 8 for contacting the back of the hook 6 and turning the hook 7 counterclockwise while the hook 6 is moving to the left in FIG. The retaining piece 19 is a restoring member that 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. The actuating section 10 is configured. Thus, the restoring actuator 10 is composed of the engaging piece 19 and the pawl 10a, and one engaging piece 19 constitutes a part of the restoring actuating part 10 and the turning actuating part 8. Note that the edges of the lips 11 and 12 facing the empty space 13 can also be used as the turning operation part 8.

Reference numeral 9 denotes a turning position holding part, which is fixed to the lip 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 vertical ribs for reinforcement, 23 are horizontal ribs for reinforcement, and 24 is a ring that makes many contact with a drive roller (not shown) in order to rotate the form body 6. Appropriate notches are formed in the right lip 26 and the ring 24 so as not to interfere with the operating rod 4, the reciprocating member 15, the engaging portions 7, 14, and the hook 6. Reference numerals 25 and 26 are gaskets.

Next, the effect will be explained.

First of all, since the single 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 each of the reciprocating members 15 is arranged with two nuts. 16, each is clamped and fixed to the operating iron 4. For example, suppose that when a predetermined tensile force is applied to the operating rod 4 of a certain length, there is an extension of IQta; at the tightened end, and an extension of l at the loosened end, and the adjacent pair of retaining parts 7゜140 The distance between each combination is equal 500m+
When closed, the distance between the centers of the reciprocating members 15 at the loose end is 49 (Jw), and the distance Fi between the centers of the retracting members 15 at the tightening end is 490 m.

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 equipment.

When the operating rod 4 is moved to the right in FIGS. 1 and 3, the foot 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, so both rollers 7c
, 14c approach each other, and the vertical lips 11 and 12 are suppressed in the direction in which they approach each other, and both formworks 1 and 2 are tightened. When the operating rod 4 moves to the right, a reaction force from the roller 7C applies a force to the hook 6 to rotate it clockwise about the pivot shaft 18 in FIG.
Since the pressure contact portion 6b of is pressed against the reciprocating material 15, the 7crew 6 does not rotate, and its cam surface 5 presses the 4-ra 7C toward the first formwork 1 side.

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, vertical reply 11,
By tightening the formwork 1.2 at various locations in the longitudinal direction of the formwork 12, the formwork body 3 rotates and centrifugal casting is carried out. In this case, since the respective advancing/retracting members 15 are installed in anticipation of the expansion of the operating rod 4, the degree of engagement between the retaining part 7 and the cam surface 5 of each part can be set equally, so that both formworks 1 , 2 can be tightened with substantially the same tightening force from the tightening side where the tensile force is applied to the opposite end. In this way, 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 is carried out by a jack or other traction means, or by a means utilizing impact force, as described above. Then, the cam surface 5 is the roller 7C.
When the hook 6 moves away from the blank space 16 toward the left end in FIG. 3, the space between the vertical ribs 11 and 12 is widened, and 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 part 8 made of the retaining piece 19 in the middle of the movement. On the other hand, the hook 6 has an arcuate portion 6
3, the hook 6 hits the pivot actuator 8 and can easily pivot counterclockwise in FIG. 3 about the pivot shaft 18. This rotation moves the entire hook 6 into the first formwork 1.
It moves to the side and is drawn into the first formwork 1 side, and is no longer in a state of greatly protruding towards the second formwork 2 side.

Then, by further moving to the left, when the hook 6 reaches the leftward movement end, the pivoting position holding portion 9 comes into contact with the pressure contact portion 6b4 of the hook 6, thereby maintaining the pivoting state of the hook 6. At this time, the claw 10a of the hook 6 is connected to the engagement piece 19.
engaged in. in a state.

This is the state shown in FIG. Therefore, as described above, both molds 1 and 2 may be opened, and the product may be removed from the mold.

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

As a result, while the pressure contact portion 6b of the 7 hook 6 separates from the rotation position holding portion, the claw 10a of the hook 6 is engaged with the engagement piece 19, so that the rightward movement of the pivot 18 causes the 7 The nail 6 is forcibly turned clockwise about the pivot 18, protrudes toward the second formwork 2, and returns to its original state. Nail 1
Even without the above-mentioned action of the restoring actuator 10 consisting of the 0a and the engagement piece 19, in the normal case, if the operating rod 4 moves to the right, the hook 6 will turn as described above under its own weight, but this will prevent the concrete from adhering to the hook 6. Even if the smoothness of turning of the hook 6 is lost due to such reasons, the hook 6 is forcibly turned and restored by the action of the restoring operation section 10. Then, by continuing to move to the right in a state in which the seven hooks 6 protrude toward the second formwork 2 and are restored, the first and second formworks 1 and 2 are tightened as described above. Tooshi Nasu.

According to the present invention, when the first and second frames are released, since the hooks have turned toward the first formwork side, the hooks largely protrude toward the second formwork side. There will never be. Therefore, the hooks do not get in the way during 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 of work. 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. This eliminates the risk of the hooks supporting the weight of the formwork and damaging it, and also increases the stability of the formwork 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 V-VS sectional view, 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, 7 is the retaining part, and 8 is the turning operation. , 9 is a turning position holding section, and 10 is a restoring operation section. Patent applicant Hiroshi Kitamura Representative patent attorney Tetsuya Mori Patent attorney
Yoshiaki Naito, Patent Attorney Masashi Kiyomizu Go to Figure 5 1

Claims (2)

[Claims] (1) An elongated formwork body formed by joining a pair of first and second formworks facing each other, and an elongated formwork body that is supported on the first formwork side and extends in the longitudinal direction of the formwork body in the same direction. an operating rod that moves forward and backward, a hook that is pivotally attached to the operating iron and has a cam surface that presses the second formwork in a direction in which both formworks approach each other relatively, and one end of the forward and backward stroke of the hook by the operation rod. On the side, there is a retaining part provided on the second formwork for engaging the cam surface of the hook, and an operating rod that contacts the back of the hook in the transition process to the other end side of the advance/retreat stroke. A formwork tightening device comprising: a turning actuating part that turns the hook to the side; and a turning position holding part provided on the first formwork and holding the hook at the turning position. (2) A silk long form body formed by joining a pair of first and second form frames facing each other, and a silk long form body supported on the first form side and extending in the longitudinal direction of the second form 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, and a hook that moves forward and backward in the same direction. A retaining part provided on the second formwork for retaining the cam surface of the hook at one end of the four-way, and a retaining part that contacts the back of the hook in the transition process to the other end of the advance/retreat stroke. a pivoting operation part that pivots the hook toward the operating rod; a pivoting position holding part that is provided on the first formwork and holds the hook at the pivoting position;
The mold is characterized by comprising a restoring actuating part that engages with the hook in the transition process of the advancing/retracting straw 1 to the retaining part side and causes the hook to pivot toward the second formwork side and return to its original state. Frame tightening device.