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The 10.5 cm Luftminenwerfer M 15 (Pneumatic Trench Mortar) was a medium mortar used by Austria-Hungary in World War I. It was developed by the German firm of Ehrhardt & Sehmer. [1] It was a rigid-recoil, muzzle-loading mortar on a fixed base that used compressed air to propel the mortar bomb to the target.
To construct a rubble trench foundation a narrow trench is dug down below the frost line. The bottom of the trench would ideally be gently sloped to an outlet. Drainage tile, graded 1":8' to daylight, is then placed at the bottom of the trench in a bed of washed stone protected by filter fabric. The trench is then filled with either screened ...
With Portland cement added, this can increase to over 6,000 psi [5] or 864,000 pounds per square foot. Once the slurry dries it creates a near-solid stone foundation for the leveled concrete (much like the original stone base the concrete was poured upon.) Benefits of stone slurry grout leveling Low-pressure lifting of slabs
Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
The Newton 6-inch replaced the 2-inch medium mortar beginning in February 1917.. It was a simple smooth bore muzzle-loading mortar consisting of a 57-inch (1,448 mm) one-piece steel tube barrel, with a "striker stud" inside the centre of the closed base of the tube.