JPH0521598Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a form support pin clamp device for a tunnel secondary winding formwork, which fixes a boss fixed to the form side and a form support pin at an arbitrary position.

[Prior art]

Conventionally, this type of form support pin clamp device S has a pin body P with a large number of locking holes H perpendicularly drilled in the pin body P, with screw holes N being the center. A washer D is fixed to the skin plate F, and an engagement hole A into which the pin body P is fitted is provided in the center of an adjustment boss B that is screwed into this screw hole N, and the locking hole A is provided in the center of the adjustment boss B that is screwed into this screw hole N. A locking hole K having approximately the same diameter as the hole H is provided through the locking hole H at a desired position of the pin body P which is fitted into the locking hole A of the adjustment boss B screwed into the washer D. The approximate position was determined by inserting the connecting pin R by aligning one with the locking hole K of the boss B, and then finely adjusting the position by rotating the adjustment boss B. However, with this method, it is necessary to remove concrete that is stuck to the screws or that is clogged in the locking hole where the connecting pin of the form support pin is inserted after concrete is poured. In addition, loads such as own weight, lateral pressure, and buoyancy act on the support pin, and in this case, there is a drawback that a large torque is required to rotate the screw.

In the diagram, C is the lifting hydraulic cylinder, G is the gantry, I is the invert form, R is the runway, T is the invert trolley device, W is the invert form hoisting device, PS is the pendant switch, SC is the steering control, and SE is the segment. , SF indicates side form.

[Problem that the invention attempts to solve]

In the conventional structure described above, the concrete adhering to the threaded part may harden, or the troublesome work of removing and cleaning the concrete stuck in the locking hole where the connecting pin of the form support pin fits is required after concrete is poured. It also had many drawbacks, such as requiring a large amount of torque to loosen the screw when a load was applied.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has been developed by drilling a hole for a form support pin at a desired position on the inside of the formwork skin plate, centering the hole in the hole, and engaging the head of the form support pin. A boss with a groove is fixed, and the form support pin can be held at any position using a clamp in which a clamping piece has an engaging protrusion that engages with the engagement groove and a tightening protrusion with a radius that tightens the form support pin. It can be tightened and released freely, and the clamp and form support pin are connected by a locking chain.

[Effect]

To explain the operation of the present invention, a form support pin is inserted from the inside into a hole drilled in the center of a boss fixed to the inner surface of a desired position of the skin plate of a telescopic circular steel form, and the form support pin is inserted into the skin plate of the form support pin. At a position where the protruding length is equal to the desired thickness of the concrete to be poured, insert the nut screwed into the tightening bolt at the tip of the clamp whose engaging protrusion has been engaged with the engaging groove of the boss in advance. When it is turned and tightened, the form support pin is strongly pinched by the inner peripheral surface of the tightening protrusion of the clamping piece inside the clamp, so that the form support pin is fixed in that position. Since the tip of the form support pin is in contact with the concrete surface, the form can be set with a distance between the outer surface of the skin plate of the form and the inner surface of the concrete that is equal to the desired concrete thickness. Ru. After adjusting the form support pins at all positions in the same way and setting all forms, while pouring concrete, loosen the clamps one by one and replace the form support pins with blank pins to allow the concrete to cure and harden. wait.

Once the concrete has solidified, loosen the nuts on the tightening bolts, remove the blank pins from the bosses, and remove the mold.

Since the form support pin is connected to the clamp by a locking chain, there is no danger of it falling.

〔Example〕

An embodiment of the present invention will be described based on the drawings. As shown in FIGS. 6 and 7, the form support pin clamp device 1 is arranged concentrically with a through hole M formed at a desired position in the skin plate F. A boss 2 is fixed to the inner surface, and the insertion hole 3 bored at the center of the boss 2 and the through hole M are made approximately the same diameter, and the inner diameter of the insertion hole 3 is a diameter into which the form support pin 4 is slidably inserted. An engaging groove 5 is cut on the outer periphery of the neck of the boss 2, and a clamp 6 for tightening the boss 2 from the outside has two clamping pieces 9 pivotably attached to the base 7 by a headed pin 8. A tightening bolt 14 is inserted into the through holes 12 and 13 of the tip portion 11 of each of the screws 10, and can be tightened and released with a nut 15. Engagement protrusions 16 and 17 that engage with the engagement groove 5 are formed, and tightening protrusions 18 and 19 having a radius slightly smaller than the outer diameter of the form support pin 4 are formed on the inner side. . The length of the form support pin 4 is longer than the thickness of the poured concrete and the thickness of the boss and the clamp. The locking hook 22 is connected with a locking chain 23.

In the case shown in FIG. 8, the form support pin 4 is replaced with a blind pin 25 having a flange 24 during or immediately after concrete pouring, and a skin plate F is formed.
This prevents concrete from leaking from the through hole M drilled in the hole M.

[Effect of idea]

Since this invention does not have a threaded part, concrete will not stick to the threaded part, and there is no hole for connecting pins.
There is no need to remove or clean up the concrete after pouring when the insertion hole is clogged with concrete, so work efficiency is high, and the connection between the boss and the form support pin is easy to maintain, especially when a load is applied. The effect of being able to easily solve the problem is extremely large. It also has the great advantage of being extremely easy to maintain.

[Brief explanation of the drawing]

Fig. 1 is a schematic side sectional view of a telescopic formwork in which the present invention is tried, Fig. 2 is a plan sectional view of the same, Fig. 3 is an enlarged sectional view of a telescopic formwork using conventional support pins, and Fig. 4 is an enlarged sectional view of a telescopic formwork using conventional support pins. The figure is an exploded front view of the form support pin device of the prior art, FIG. 5 is an assembled front view of the same, FIG. 6 is a front view of the form support pin clamp device of the present invention, and FIG. FIG. 8 is an assembled front view when the blind pin is replaced. Explanation of symbols of main parts, 1... Form support pin clamp device, 2... Boss, 3... Hole insertion, 4...
... Form support pin, 5 ... Engagement groove, 6 ... Clamp, 8 ... Head pin, 9 ... Clamping piece, 10 ...
Clamping piece, 14... Tightening bolt, 15... Nut,
16... Engaging ridge, 17... Engaging ridge, 18...
Tightening ridge, 19... Tightening ridge, 23... Locking chain, F... Skin plate, M... Through hole.

Claims (1)

[Scope of utility model registration request] Bosses are drilled at required locations on the inside of the skin plate of the formwork, centering on the insertion holes into which the form support pins are slidably inserted. The clamp is fixed concentrically and has an engagement groove on the outer periphery of the neck of this boss, and the tip of the clamp, which can be opened and closed and is pivoted at the base by a headed pin, can be tightened and released with a tightening bolt and nut. An engagement protrusion that engages with the engagement groove is formed on the outside of the clamping piece, and a tightening protrusion with a radius slightly smaller than the outside diameter of the form support pin is provided on the inside, and the form support pin is A form support pin clamp device for a tunnel secondary winding formwork, which is provided with a locking hook for a locking chain.