I'm going to build a floor hatch about 5cm thick, with a steel frame and filled with concrete to drive over with a car. My problem is that I can't find any hinges that fit.
Currently, I am working on a glass hatch with a steel frame for a wine cellar in a concrete floor and have procured Tectus heavy duty concealed hinges.
The wine cellar hatch will weigh just under 200kg and the hinges can handle 200kg - for a door?!? The hatch is oriented differently than doors and the load is applied in another way. Additionally, the wine cellar hatch, like the concrete hatch, will be assisted by gas springs when opening. The concrete hatch will also be opened by a linear actuator that can handle 10000N.
I have found pictures of hatches similar to my concrete hatch, but no detailed drawings of hinges. Could the hinge type above work? The hatch is supported more by my actuator than the hinges, right?
Is the idea that the gas struts should help lift the hatch when opening?
Otherwise, I would have opted for a hatch made of/with sturdy wooden beams that a car can drive over. More manageable for one person.
Yep. The gas springs help lift the hatch, even though it's not really needed with the actuator installed. The hatch will be in steel and concrete, so there's no talk of wood!
Now, the gas spring and actuator will not lift the hatch directly upwards, and the closer the spring and actuator are to the hinge, the higher the load on the hinges. Imagine if someone happens to stand on the hatch when the actuator applies 10,000 Newtons.
Calculate the torques: 2000 N x half the hatch's length = force at the actuator's attachment x distance between the hinge and the actuator's attachment.
It is an advantage for the hinges when they are on a floor hatch rather than on a door.
Protte
PS, When I was growing up, the gray concrete suburbs were depressing; now "EVERYONE" wants concrete indoors...
The times are out of joint.
Tiles could have been placed on something lighter than concrete and only 5 cm thick, and driving a car on it doesn't feel right to me.
Concrete has poor tensile strength, it can handle compression but is weak in tension.
Well.. you might need to rethink that a little...........
Explain
The frame the hatch is in is 50 mm high. I was thinking of welding together a well-reinforced hatch with a 5 mm steel plate at the bottom, a 40 mm frame of square tubing, and 5 mm steel on top. Inside the hatch, weld in coarse reinforcement mesh. Off to galvanization and then fill the cavity in the hatch with concrete.
Feels like a stable and quiet hatch that can handle tile installation.
Offhand, Tectus concealed hinges should hold as they can handle a 200kg door. Violina said:
