# US 2021/0079680 A1 · Precast and prestressed concrete tank with temporary construction opening > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0079680 A1 - Document ID: US20210079680A1 - Status: Published application - Kind: A1 - Application number: 17/104,498 - Filed: 2020-11-25 - Published: 2021-03-18 - Earliest claimed: 2017-12-19 - Assignees: Preload Cryogenics, LLC - Applicants: Preload Cryogenics, LLC - Inventors: Sanjay Mehta; Eric T. Reaman - Web page: https://patentgrep.com/patent/US20210079680A1 ## CPC - E04H 7/20: Prestressed constructions - F17C 3/00: Vessels not under pressure - F17C 2201/0109: with exteriorly curved end-piece - F17C 2201/0119: with flat end-piece - F17C 2201/032: with substantially vertical main axis - F17C 2201/052: large (>1000 m3) - F17C 2203/012: on or in the wall, e.g. ribs - F17C 2203/0609: Straps, bands or ribbons - F17C 2203/0624: with four or more layers - F17C 2203/0629: Two walls - F17C 2203/0639: Steels - F17C 2203/0675: with details of composition - F17C 2203/0678: Concrete - F17C 2203/0695: pre-constrained - F17C 2209/22: Assembling processes - F17C 2209/221: Welding - F17C 2209/228: by screws, bolts or rivets - F17C 2209/232: of walls - F17C 2221/014: Nitrogen - F17C 2221/033: Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG - F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG - F17C 2223/033: Small pressure, e.g. for liquefied gas - F17C 2260/013: Reducing manufacturing time or effort - F17C 2270/0134: placed above the ground - E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D) - F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25) ## Abstract A precast, prestressed concrete tank and method that facilitates construction of a primary inner tank within a secondary outer tank, and which permits for the construction of the primary inner tank after the secondary outer tank has been erected, but without requiring insertion through a top of the secondary outer tank, or by tunneling underneath the secondary outer tank, is disclosed. The primary inner tank has an inner wall and the secondary outer tank has an outer wall (precast, prestressed concrete) and wire windings. The primary inner tank is disposed inside of the secondary outer tank. The secondary outer tank has a plurality of first precast outer wall panels, and a temporary construction opening frame. The temporary construction opening frame defines an access doorway during construction of the tank. The temporary construction opening frame is disposed on a foundation base slab. ## Claims ### Claim 1 A method for manufacturing a precast, prestressed concrete tank, the method comprising the steps of: providing a plurality of first precast outer wall panels and at least one second precast outer wall panel, the at least one second precast outer wall panel having a height shorter than each of the first precast outer wall panels; providing a temporary construction opening frame defining an access doorway and including a plurality of clamps; assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide a secondary tank, the temporary construction opening frame providing access to an interior of the secondary tank assembly; and assembling a primary tank assembly within the secondary tank by delivery of components through the access doorway. ### Claim 2 (depends on 1) The method of claim 1, further comprising a step of winding a first phase of wire windings around at least a portion of the secondary tank. ### Claim 3 (depends on 2) The method of claim 2, further comprising a step of filling the temporary construction opening frame with a temporary backing prior to the step of winding the first phase of wire windings. ### Claim 4 (depends on 3) The method of claim 3, further comprising a step of clamping the first phase of wire windings over the temporary construction opening frame with the clamps. ### Claim 5 (depends on 1) The method of claim 1, wherein the step of providing the temporary construction opening frame further includes steps of laying a base slab on a surface where the precast, prestressed concrete tank will be manufactured prior to the step of assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide the secondary tank. ### Claim 6 (depends on 5) The method of claim 5, further comprising a step of installing a sketch plate and a skirt plate on the base slab, and wherein the temporary construction opening frame is constructed on a top side of the skirt plate. ### Claim 7 (depends on 1) The method of claim 1, wherein the temporary construction opening frame has a base section, and pair of column sections, and a header section, the base section and the header section spaced apart and connected by the pair of column sections, and wherein the step of assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide the secondary tank further includes a step of disposing the at least one second precast outer wall panel on top of the header section of the temporary construction opening frame. ### Claim 8 (depends on 7) The method of claim 7, wherein the plurality of first precast outer wall panels and the at least one second precast outer wall panel have weld plates, and further comprising a step of welding together the plurality of first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame. ### Claim 9 (depends on 8) The method of claim 8, further comprising a step of applying shotcrete between the first precast outer wall panels, the second precast outer wall panels, and the temporary construction opening frame. ### Claim 10 (depends on 9) The method of claim 9, further comprising a step of applying shotcrete to the first precast outer wall panels and the second precast outer wall panels after the step of assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide the secondary tank. ### Claim 11 (depends on 1) The method of claim 1, further comprising a step of sealing the access doorway of the temporary construction opening frame after the primary tank is assembled within the secondary tank. ### Claim 12 (depends on 11) The method of claim 11, further comprising a step of winding a second phase of wire windings around the secondary tank assembly following the step of sealing the access doorway. ### Claim 13 (depends on 12) The method of claim 12, further comprising applying shotcrete to the secondary tank assembly following the step of winding the second phase of wire windings around the secondary tank assembly. ### Claim 14 A method for manufacturing a precast, prestressed concrete tank, the method comprising the steps of: providing a plurality of first precast outer wall panels and at least one second precast outer wall panel, the at least one second precast outer wall panel having a height shorter than each of the first precast outer wall panels; providing a temporary construction opening frame defining an access doorway and including a plurality of clamps; assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide a secondary tank, the temporary construction opening frame providing access to an interior of the secondary tank assembly; assembling a primary tank assembly within the secondary tank by delivery of components through the access doorway; and winding a first phase of wire windings around at least a portion of the secondary tank; wherein the step of providing the temporary construction opening frame further includes steps of laying a base slab on a surface where the precast, prestressed concrete tank will be manufactured prior to the step of assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide the secondary tank. ### Claim 15 A method for manufacturing a precast, prestressed concrete tank, the method comprising the steps of: providing a plurality of first precast outer wall panels and at least one second precast outer wall panel, the at least one second precast outer wall panel having a height shorter than each of the first precast outer wall panels; providing a temporary construction opening frame defining an access doorway and including a plurality of clamps; assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide a secondary tank, the temporary construction opening frame providing access to an interior of the secondary tank assembly; assembling a primary tank assembly within the secondary tank by delivery of components through the access doorway; wherein the temporary construction opening frame has a base section, and pair of column sections, and a header section, the base section and the header section spaced apart and connected by the pair of column sections, and wherein the step of assembling the first precast outer wall panels, the at least one second precast outer wall panel, and the temporary construction opening frame to provide the secondary tank further includes a step of disposing the at least one second precast outer wall panel on top of the header section of the temporary construction opening frame; and sealing the access doorway of the temporary construction opening frame after the primary tank is assembled within the secondary tank.