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Modular Construction Protected by Cradle and Crown™ Method
See an example of the strength and durability of the Protected Cradle & Crown™ Construction
| Haz-Safe's Protected Cradle and Crown Construction is a method of utilizing tubular steel bands around the perimeter of the cradle (base) and the crown (roof) with structural steel members filling in the support for the floor, walls and roof and then clad with heavy steel plate. The result is a very strong, continuously welded utilized structure that can out-perform other types of conventional construction and is the foundation of any modular manufacturing for pharmaceutical, chemical and petroleum manufacturing facilities. Haz-Safe's robust steel buildings and modules when complete (even with concrete floors) can accommodate architectural finishes, utilities, process piping and equipment, to be installed before units are transported to the final work site. Equipment installed within modules are placed in their final operation location and will not require reassembly or extensive re-testing. Entire systems can be assembled and pre-qualified under controlled workshop conditions. Once on site, individual buildings or multi-modules can be safety crane lifted and bolted in place. Protected Cradle and Crown construction is emphasized every time a Haz-Safe building or modules are lifted into place. See details below... |
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| Left: Typical crane lifting situation where a Haz-Safe paint dispensing module is being placed on the top level of a naval shipyard facility. Floor of building is strong enough to be lifted or non-supported underneath even when it is loaded with user's products. Right: Same module hanging seven stories up and is about to be maneuvered onto its resting place. | |
Tubular Steel - A true hazmat building should be constructed of very stiff and strong members. Haz-Safe Buildings' exclusive use of hollow structural sections (HSS) or "box" tube steel for fabrication is stronger (higher-strength-to-weight-ratio). Its strength is uniformly consistent along its entire length because it is formed four-sided, not like two-sided angles or three-sided common wall studs. Tube steel's surface is smoother than channel or angle steel, therefore cleaner and easier to paint and its radius edges are architecturally friendly and aesthetically appealing.
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Outside
view of exterior painted 10 gauge steel wall plate (with red stripe)
and attached to the wall a 10' high x 4'6" deep x 8' long blast
shaft which, constructed same as building, also has a 120 lb. per
square foot blast rating. |
Interior
view of a non-combustible steel Haz-Safe building with 1/4"
thick 2" x 2" tubular frame within the outside surface
of the frame clad with 10 gauge steel plate. Building has 120 lbs.
per square foot blast rating with 8' high ceiling. |
Graphic shows
a crane hoist in building. The crane's two runway "I"
beams are secured to the roof and walls without adding exposed steel
within the room, but are attached with only bolts going through
fire rated gypsum to the basic tubular frame of the building. Crane
is capable of lifting an individual 4' x 4' x 6' high 550 gallon
tote tannk (proof of building's strength). |
Skeleton - tubular steel members,1/4" thick (ASTM-A500 Grade B), are continuously welded together, fabricating the strongest superstructure, therefore the safest building. For example, horizontal and vertical tube steel structural members, like the horizontal 4" x 4" roof tubes, coming together at right angle and connecting on top of the 2" x 4" corner wall tube have 20" of continuous weld! Remember, 1/4" thick steel has, by weight, 186% more steel than 10 gauge, which has 281% more steel than 18 gauge. Imagine how much weaker buildings with 20 gauge common steel studs in walls are as compared to 1/4" thick tubular steel vertical members.
Here's the difference: A steel worker picks up off the shop floor a single eight foot long section of common 4" steel wall stud. The stud is grabbed at one end and the worker can literally shake it so that it wiggles along its length. But Haz-Safe's smallest member, a 2" x 2" (1/4" thick wall) tube, has to be picked up differently. The tube is handled in the middle of its length because it is too heavy to be picked up from one end and is solid with no wiggle. So, when hundreds of tubes are continuously welded into a skeleton, the resulting building doesn't wiggle or bend either (see photos below).
Steel Skin - 10 gauge cold-rolled plate (ASTM - A569) is continuously welded to sump floor, outside walls and roof, creating a unitized steel structure. No mechanical fasteners. Glossy white acrylic enamel finish with 6" high red stripe standard. NOTE: 10 gauge plate is approximately 1/8" thick and, after being continuously welded to the frame, it will not show any "oil canning." The term "oil canning" refers to the old time oil cans that were used to oil squeaky door hinges, etc. Pressing in the convex bottom of the oil can with one's thumb would expel a squirt of oil through the tapered nozzle. Sometimes, however, the bottom of the oil can would stay pressed in (concave), frustrating attempts to apply more oil. Continuously welded 14 and 12 gauge steel sheet, since it is thinner, tends to be wavy and have a wrinkled weak appearance.
Structure Performance exceeds Factory Mutual (FM) wall load requirements for (A) "without explosion relief" construction for 90 MPH wind and (B) "with explosion relief" adding 100 Ibs. psf. against blast plus installing 1 sq .ft. of relief panels for every 50 cu. ft. of internal volume. Standard loads are 40 Ibs. psf. snow, 250 Ibs. floor, and Zone 4 earthquake. Actual structural performance is greater for Haz-Safe Buildings. For example, the 10 gauge plate external skin spanning 23" between every vertical wall tube can withstand 120 lbs. ft.2 blast pressure with FM approval up to 16 ft. high (Click here for more information on Blast Resistance Rating - FM approval).
Roof Crane Lifting Lugs, 3/4" thick, are welded into the crown, each capable of lifting over 16,000 Ibs. No spreader bars or slings under building are required by riggers when building is lifted.
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