JPS5849372B2 - Tightening device for upper and lower formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device for upper and lower formwork, and in particular, in a long formwork for molding concrete piles etc., engaging bodies are provided in both the upper and lower formwork, respectively, and both engaging bodies are provided. By moving the fasteners engaged with each other, the distance between the two engaging pieces is changed, and the upper and lower formworks are tightened by moving the fasteners other than the formwork.

Conventionally, this type of tightening device has a wedge fixed to one of the flanges of the upper and lower formworks, and a wedge receiving piece for receiving the wedge is provided on the other side, thereby securing all the frames of one formwork. By moving the wedge, the upper and lower formworks were tightened by the wedge (for example, Utility Model No. 51-1
No. 52056, No. 52-84962).

However, according to such a tightening device, in order to tighten and release the tightening of the formwork, it is necessary to move either one of the upper and lower formworks in the longitudinal force direction of the formwork.

However, if the surface of a concrete molded product is smooth in the longitudinal direction, it is not very difficult to move the formwork, but if the formwork itself has become uneven due to long-term use, It is extremely difficult to move the formwork during demolding after the concrete has hardened because the unevenness of the concrete and the unevenness of the formwork are in mesh with each other.

Further, depending on the type of concrete molded product, there are types in which portions with different diameters are provided at each portion in the longitudinal direction, so that the enlarged portion and the constricted portion are alternately shaped.

In the case of such concrete molded products as well, there is a drawback that it is impossible to move one of the formworks because the unevenness of a certain molded product and the unevenness of the formwork are interlocked.

In addition, this type of concrete formwork must be tightened at several points along its length, and in addition to the wedge means, bolts pivotably attached to one formwork are used as a means for this. Conventionally, mechanisms for tightening by engaging with engaging pieces fixed to the other formwork are provided at several locations.

However, in this case, each tightening mechanism must be tightened and released, which is extremely troublesome to operate.

This inventor came up with this invention in view of such problems.

That is, an object of the present invention is to provide a tightening device capable of tightening and releasing the upper and lower formwork without moving the formwork, and an object of the present invention is to provide a tightening device that has a simple structure and is capable of tightening and releasing the upper and lower formwork. It is an object of the present invention to provide a tightening device that is easy to operate for tightening and releasing the same.A further object of the present invention is to provide a tightening device that is easy to operate for tightening and releasing the same. The object of the present invention is to provide a tightening device that can perform the following operations.

Therefore, the present invention, as shown in the illustrated embodiment, has an upper formwork 1.
and the lower formwork 2, respectively, and a rod 12 configured to be movable forward and backward in the longitudinal direction of both the formworks 1 and 2. When the frames 1 and 2 are moved in the longitudinal direction, they are arranged along the longitudinal direction of the formworks 1 and 2 so as to engage with both the engaging bodies 3 and 4 and press the upper and lower formworks 1 and 2 together. At least three or more tightening devices 5
At least one of the engaging bodies has an engaged portion 6 or 11 with which the tightening tool 5 engages, and the tightening tool 5 has an engaged portion 6 or 11 that engages with the engaging body by movement thereof. forming an inclined surface 7 which acts to bring both engaging bodies closer together;
The rod 12 relates to a tightening device for upper and lower formworks, which is characterized in that the rod 12 is connected to the rod 12 by screwing so that the position of the rod 12 can be adjusted in the axial direction.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The attached drawings show examples of upper and lower formworks 1 and 2 in formwork A used in the centrifugal casting method for manufacturing concrete products such as concrete piles and Hume pipes.

Formwork A consists of an upper formwork 1 and a lower formwork 2, and both formworks 1,
2 has a semicircular cross section and each has a trough shape, and these face each other to form a cylindrical formwork A.

Although not shown, the upper and lower formworks 1 and 2 are connected by hinges at one end of the semicircle so that they can be opened and closed, and a tightening device is provided at the other end of the semicircle.

FIG. 8 is a front view showing a tightening device according to an embodiment of the present invention, in which both upper and lower formworks 1 and 2 are hinged on the back side of formwork A.

As shown in FIGS. 3.4 and 7, the engaging bodies 3, 4 have flanges 9, 10 formed at their bases, and these flanges 9, 1
0 are fixed to both the upper and lower formworks 1 and 2.

Further, as shown in FIG. 1, on the lower outer surface of one of the engaging bodies 3 provided on the lower formwork 2, an engaged portion of an inclined surface is provided in either direction in the longitudinal direction of the formwork. form 6.

The other engaging body 4 provided on the upper formwork 1 has an inclined surface facing in the same direction as the engaged portion 6 provided on the engaging body 3 of the lower formwork on the upper outer surface thereof. A joining part 11 is formed.

The pair of engaging bodies 3 and 4 are wedge-shaped.

The lower engaged portion 6 and the upper engaged portion 11 are preferably hardened by hardening or the like.

It goes without saying that the engaging bodies 3 and 4 may be formed using ready-made angle iron or the like.

A large number of such engagement trees 3 and 4 are installed in the longitudinal direction of the formwork A, and engage with the engagement guide 7 of the tightening tool 5.

In this embodiment, the tightening tool 5 includes one plate body that engages in common with the pair of engagement bodies 3 and 4.

As shown in Fig. 1, three or more fasteners 5 arranged in the longitudinal direction of the formwork A are integrally connected in the axial direction with connecting rods 12 interposed between adjacent fasteners. , the formwork A is arranged so that it can move forward and backward integrally in the longitudinal direction.

The connecting rods 12 that connect these fasteners 5 are provided with screws on both sides in the longitudinal direction, and are fixed to bearings 13 provided on both sides in the longitudinal direction of the fasteners 5 by tightening them with l-14.15 nuts. There is.

At the rear of each of the bearings 1 3.13 facing each other for receiving the connecting rod 12 of the adjacent fasteners 5, 5, there is provided a nut l-14.15 for fixing the connecting rod 12. A long hole 16 is provided.

Therefore, this elongated hole 16 only needs to be formed when the inner nut 14 cannot be attached.

The fasteners 5, 5 disposed near both ends of the formwork A pass the connecting rod 12 through the bearings 13, 13 in the same manner as described above, and in one fastener 5, the bearings are inserted into the end plate X of the formwork A. A groove S is provided in which the material is guided so that it can move forward and backward, and in the case of the other fastening tool 5, a bearing groove S is provided in the end plate κ of the formwork A and the material is guided therein in a manner that it can be rotated.

In the case of the latter fastener 5, the connecting rod 12 has a nut 14 that is
It is arranged concentrically on the opposite side of the bearing 13 from the end plate κ, is fixed thereto by welding, and is screwed onto the connecting rod 12.

Then, by turning the connecting rod 12 on the end plate κ side, the tightening tool 5
is indexed by a screw, and can move everything including the other tightening tool 5 via the other connecting rod 12 in the direction of tightening the engaging bodies 3 and 4 (to the right in the drawing). can.

Further, the tightening tool 5 has an engagement guide 7 whose spacing gradually narrows in either direction along the forward/backward direction, and which engages the pair of engaging bodies 3, 4 from both upper and lower outer sides. I am disciplined.

The means for gradually narrowing the interval between the engagement guides 7 is such that at least a portion of the engagement guides 7 are provided with an inclined surface 8 corresponding to the inclined engaged portions 6 and 11 of the engagement bodies 3 and 4. 17
It is formed by forming.

The engagement guide 7 in this embodiment has an inclined surface 8 corresponding to the inclined surface 6 of the engaging body 3 provided on the lower formwork 2, that is, a lower inclined surface corresponding to the lower engaged portion 6 of the engaging body 3. Upper engaged portion 1 of engaging body 4 provided on upper formwork 1 while forming surface 8
The upper inclined surface 17 corresponding to 1 is shaped and has a cut in the shape of a 1,000-sided letter.

The inclined surfaces 8 and 17 are hardened.

The engagement guide 7 has a formwork A continuous to its wide part.
A waiting section 18 forming a wide groove extending in the longitudinal direction of the formwork A is opened, and an opening section 19 that is continuous with this waiting section 18 and opened in a direction intersecting the longitudinal force direction of the formwork A is formed. There is.

When the formwork A is opened, this opening part 19 is opened to one of the engaging bodies 3
forms a passage for getting out of the fastener 5.

Further, the inclined portion 21 formed continuously from the lower inclined surface 8 of the tightening tool 5 up to the open portion 19 serves as a guide for one engaging body 3 to engage with the engagement guide 7 of the tightening tool 5. Eggplant.

Then, when the tightening is released, the engaging bodies 3 and 4 face the waiting portion 18 of the tightening tool 5.

The engaging bodies 3 and 4 shown in FIG. 7 show an embodiment in which a head 20 that bulges outward is formed at each tip.

According to the engaging bodies 3 and 4, the tightening tool 5 has the head 20
The engagement bodies 3 and 4 are interposed between the facing surfaces of the flanges 9 and 10 to prevent them from being pulled out, and the engagement of the engagement bodies 3 and 4 with the tightening tool 5 is maintained.

Although the engagement guide 7 in this embodiment has its inclined portions, that is, the lower fastener inclined surface 8 and the upper fastener inclined surface 17, both of which are configured symmetrically, they do not necessarily have to be symmetrical.

For example, one inclined surface 17' may be substantially horizontal as shown by the chain line in FIG.

At this time, the other inclined surface 8' has a steeper angle of inclination than in the case of the solid line, as similarly shown by the chain line.

Reference numeral 22 in the figure is a guide member made of angle iron to guide the tightening tool 5 moving back and forth in the longitudinal direction of the formwork A. In particular, as shown in FIG. The inner side faces the upper outer surface of the tightening tool 5, and the inner side of the other side 24 is arranged above where the engaging bodies 3, 4 and the engagement guide 7 of the tightening tool 5 engage.

In this way, even if a pressing force is applied upward to the tightening tool 5 when moving forward or backward, the presence of the guide member 22 eliminates the risk of the tightening tool coming off from the engaging bodies 3, 4, and the tightening operation can be performed. safety is ensured, and the tightened state can be maintained safely and reliably.

This guide member 22 is provided for each set of the engaging bodies 3, 4 and the tightening tool 5.

Note that 25 shown in FIGS. 6 and 7 is a packing.

FIG. 6 shows an embodiment in which the packing 25 is inserted into a groove provided in the joint end face of the lower formwork 2 and interposed between the joint end faces of the upper formwork 1 and the lower formwork 2. .

FIG. 7 shows an embodiment in which the connecting end surfaces of the upper and lower forms 1 and 2 are sealed from the outside by being inserted into a groove provided on the remaining surface of the base of one of the engaging body bases 10.

In this embodiment, it is preferable that the engaging body bases 9 and 10 are configured to extend over the entire length of the formwork A in the longitudinal direction.

Further, reference numeral 26 in FIG. 8 indicates reinforcing ribs of both formworks 1 and 2.

Furthermore, in FIGS. 1, 2, and 3, 27 is a locking mechanism for fixing the tightening tool 5 at a predetermined position.

This locking mechanism 27 includes a locking piece 28 protruding from the upper outer surface of the tightening tool 5, a fixing piece 29 protruding from the upper formwork 1 opposite to the locking piece 28, and one end attached to the fixing piece 29. and a screw member 30 which is pivotably mounted on the locking piece 28 side so as to be pivotable.

The locking piece 28 and the fixing piece 29 have a cutout in which the screw member 30 engages.

This notch is formed so that both notches overlap at a position where the tightening tool 5 is moved toward the engaging bodies 3 and 4 to tighten the formwork A.

After moving the tightening tool 5 to tighten the upper and lower formworks 1 and 2, the screw member 30 is turned toward the locking piece 28 and inserted into both the notches of the locking piece 28 and the fixing piece 29. When engaged, the screw member 3
Tighten 0.

As a result, the upper formwork 1 and the fastening tool 5 are fixed, so that the fastening tool 5 cannot be moved due to vibrations, etc., and therefore, the above-mentioned tightening of both the formworks 1 and 2 is locked. .

In addition, among the tightening tools 5, the one in the middle and the rod 12,
The position in the rod axis direction is adjusted in advance in anticipation of the extension of the rod 12 due to tension.

Therefore, when tightening both the upper and lower formworks 1 and 2, use the tightening tool 5.
may be moved to the right in FIGS. 1, 2, 5, and 8.

Various means of transportation can be employed.

For example, there is a method in which the end of the tightening tool 5 is a screw rod, a seat is formed at the end of the formwork A, and this is used as a seat for a nut to be screwed onto the screw rod, and the nut is rotated, or a method in which the nut is rotated. There is a method of towing the steel rod as a prestressed material with a jack, simultaneously with the steel rod, or separately from the steel rod.

When the tightening tool 5 is moved to the right, both the engaging bodies 3 and 4 move from the standby section 18 toward the engagement guide 7 relative to the tightening tool 5.

Therefore, both the engaging bodies 3 and 4 are guided by the engaging guide 7, and the distance between them is forcibly reduced.

As a result, the upper formwork 1 and the lower formwork 2 to which the holders 3 and 4 are attached via the flanges 9 and 10 are tightened.

By engaging the locking mechanism 27, both formworks 1
, 2 are locked.

In this case, if the axial position of the rod 12 of the tightening tool 5 located in the middle is adjusted in advance in anticipation of the extension of the rod 12, the tightening of the formworks 1 and 2 can be performed. can be made uniform over the longitudinal direction.

To release the tension between the formworks 1 and 2, the locking mechanism 27 may be released and the tightening tool 5 may be moved in the opposite direction to the movement described above, that is, to the left.

As a result, both the engaging bodies 3 and 4 relatively move within the engaging guide 7 to the right while expanding the distance between them.

Then, when both the engaging bodies 3 and 4 reach the standby section 18 formed on the right side of the engaging guide 7, the release of the tightening is completed.

Thus, by opening the upper formwork 1 upward, the engaging body 3
leaves the standby section 18 through the open section 19.

Therefore, demolding of molded products such as concrete piles can be done smoothly.

As is clear from the above, according to the present invention, both the upper and lower formworks can be tightened and released reliably by simply moving a tightening tool separate from both the formworks back and forth.

Therefore, since there is no need to move either the upper or lower formwork for tightening or release, the formwork may be uneven due to long-term use, or unevenness may be formed on the formwork due to the special shape of the concrete or molded product. Even if the unevenness of the formwork and the unevenness of a concrete molded product are interlocked with each other, the demolding can be done extremely smoothly.

Furthermore, all of the tightening tools can be moved by operating a rod at one location, allowing uniform tightening and release of both upper and lower formworks.

Therefore, the structure is simple, and the operation is extremely simple and does not require any skill.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a sectional view taken along line 3-3 of FIG. 1, and FIG. 4 is a view of FIG. 1. 5 is an enlarged front view, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a sectional view showing another embodiment of the engaging body, and FIG. is a front view of the formwork. In addition, in the figure, 1 is the upper formwork, 2 is the lower formwork, 3 and 4 are the engaging bodies,
5 is a tightening tool, 6 and 8 are inclined surfaces, and 7 is an engagement guide.

Claims (1)

[Claims] 1. A pair of engaging bodies provided in the upper formwork and the lower formwork, respectively;
Both formworks are connected in series by rods that are configured to move forward and backward in the longitudinal direction of the formwork, and are moved in the longitudinal direction of the formwork to engage with both engaging bodies and open the upper and lower formworks. at least three or more fasteners arranged along the longitudinal direction of the formwork so as to press against each other, and at least one of the engaging bodies is formed with an engaged portion that is engaged by the fasteners, Furthermore, the tightening tool is provided with a slope that, when moved, engages with the engaging body and acts to bring the two engaging bodies closer to each other; . A tightening device for upper and lower formworks, characterized in that the rod is connected to the rod by screwing so that the position can be adjusted in the axial direction of the rod.