CN211474000U

CN211474000U - LNG storage tank and in-tank vertical ladder

Info

Publication number: CN211474000U
Application number: CN201922145542.9U
Authority: CN
Inventors: 陈宏�
Original assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Nantong CIMC Sinopacific Ocean Offshore and Engineering Co Ltd
Current assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Nantong CIMC Sinopacific Ocean Offshore and Engineering Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-09-11
Anticipated expiration: 2029-12-04

Abstract

The utility model relates to a vertical ladder in LNG storage tank and jar. The tank body vertical ladder comprises a ladder frame, an upper ear plate, a lower ear plate and a fastener; the lower part of the ladder frame is provided with a long hole, and the length direction of the long hole is parallel to the length direction of the ladder frame; the upper ear plate is integrally formed by extending from the upper end of the ladder frame and is used for being welded in the storage tank; the lower ear plate is used for welding the inside of the storage tank, and a round hole is formed in the alignment long hole in the lower ear plate; the fastener passes through the round hole and the long hole so as to fix the lower part of the ladder frame on the lower ear plate. When the ladder frame stretches out and draws back, the fastener can remove in the slot hole, and ladder frame's the constant maintenance is fixed with being connected of last otic placode and lower otic placode, and the tie point at ladder frame's both ends can not become flexible, and ladder frame's connection is more reliable.

Description

LNG storage tank and in-tank vertical ladder

Technical Field

The utility model relates to a tank field, in particular to straight ladder and LNG storage tank in jar of LNG storage tank.

Background

Liquefied Natural Gas (LNG) is a high-quality energy source and has the characteristics of high calorific value and low combustion pollution. In practical application, when the marine storage tank is used for transporting LNG, the design temperature range of the marine LNG tank is generally (+45 ℃ to-163 ℃), the temperature of the storage tank is reduced from the highest temperature to the lowest temperature, and the temperature difference is 208 ℃. When setting up the vertical ladder in the storage tank, the upper and lower both ends of vertical ladder all are connected fixedly through the pipe wall of the fastener and the jar body, and the vertical ladder receives the influence of temperature, and when its expend with heat and contract with cold, has certain flexible length, leads to the tie point to become invalid easily, influences the tie point reliability.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an in-tank vertical ladder for an LNG storage tank, which solves the problem of unreliable connection in the storage tank.

In order to solve the technical problem, the utility model adopts the following technical scheme:

according to one aspect of the utility model, the utility model provides an in-tank vertical ladder of an LNG storage tank, which comprises a ladder frame, an upper ear plate, a lower ear plate and a fastener; the lower part of the ladder frame is provided with a long hole, and the length direction of the long hole is parallel to the length direction of the ladder frame; the upper ear plate is integrally formed by extending from the upper end of the ladder frame and is used for being welded in the storage tank; the lower ear plate is used for being welded inside the storage tank, and a round hole is formed in the lower ear plate in an aligned mode with the long hole; and a fastener penetrates through the round hole and the long hole so as to fix the lower part of the ladder frame on the lower ear plate.

Optionally, the fastener includes a bolt and a nut, the bolt is inserted into the long hole and the round hole, the nut is screwed on the bolt, and the nut is welded on the bolt.

Optionally, the ladder frame comprises two parallel pillars arranged at intervals, and a plurality of step pieces arranged at intervals along the length direction of the pillars, each step piece is vertically connected between the two pillars, and the long holes are aligned and arranged at the bottoms of the two pillars; the upper ear plate and the pillar are integrally formed.

Optionally, each strut comprises a web and a wing plate which is formed by bending and extending outwards from one side of the web; the upper lug plate is formed by extending from the other side of the web plate; the wing plates of the two support columns extend back to back, and the step part is vertically connected to the web plates of the two support columns.

Optionally, the length of the ladder frame is less than or equal to 6000 mm.

Optionally, the length of the slot is greater than 13 mm.

Optionally, the length of the long hole is 20 mm.

According to another aspect of the present invention, the present invention provides an LNG storage tank, which comprises a tank body and a vertical ladder, wherein the tank body is provided with a manhole, and the vertical ladder is located below the manhole; the upper ear plate and the lower ear plate are welded in the tank body.

According to the above technical scheme, the utility model discloses following beneficial effect has at least:

the technical scheme of the utility model in, go up the otic placode and form from the integrative extension in the upper end of ladder frame, go up the otic placode and all be used for welding in the storage tank with lower otic placode, round hole and slot hole are connected to the fastener for the vertical ladder can be fixed in the storage tank. Go up otic placode and ladder frame integrative, go up the otic placode and need not utilize the fastener with ladder frame to be connected, reduced the use amount of fastener and the work load of installation fastener.

Further, the slot hole has been seted up to the lower part of ladder frame, and the length direction of slot hole is on a parallel with the length direction of ladder frame, and when ladder frame was flexible, the fastener can remove in the slot hole, and ladder frame remains throughout to be connected with last otic placode and lower otic placode fixed, and the tie point at ladder frame's both ends can not become flexible, and ladder frame's connection is more reliable.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of an LNG storage tank according to the present invention;

fig. 2 is a schematic side view of the embodiment of the vertical ladder of the present invention;

fig. 3 is a schematic front structural view of a ladder frame of an embodiment of the vertical ladder of the present invention;

fig. 4 is a schematic side view of a ladder frame of an embodiment of the vertical ladder of the present invention;

figure 5 is a top view of a support post of an embodiment of the present invention;

fig. 6 is a schematic structural view of a lower ear plate of the embodiment of the vertical ladder of the present invention;

fig. 7 is a schematic structural view of a fastener according to an embodiment of the present invention.

The reference numerals are explained below:

1. a tank body; 11. a manhole; 2. a straight ladder; 21. a ladder frame; 211. a pillar; 2111. a web; 2112. a wing plate; 212. a step member; 213. a long hole; 22. an upper ear plate; 23. a lower ear plate; 231. a circular hole; 24. a fastener; 241. a bolt; 242. a nut; 243. and (7) welding points.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

Referring to fig. 1, the present embodiment provides an LNG storage tank, including a tank body 1 and a vertical ladder 2 disposed in the tank body 1, a manhole 11 is disposed on the tank body 1, and the vertical ladder 2 is located below the manhole 11, so that a worker can move onto the vertical ladder 2 through the manhole 11. The tank body 1 is internally provided with other mechanisms such as a deep-well pump, and the specific structure of the storage tank refers to the structure of the storage tank in the related technology.

Referring to fig. 2, the vertical ladder 2 includes a ladder frame 21, upper ear plates 22, lower ear plates 23, and fasteners 24. The upper ear plate 22 and the lower ear plate 23 are both used for welding inside the storage tank, and the ladder frame 21 is connected to the upper ear plate 22 and the lower ear plate 23 to fix the ladder frame 21.

Referring to fig. 1 to 3, the ladder frame 21 includes two parallel pillars 211 arranged at intervals, and a plurality of step members 212 arranged at intervals along the length direction of the pillars 211, and each step member 212 is vertically connected between the two pillars 211. The worker moves on the ladder rack 21 by moving on the plurality of step members 212.

Referring to fig. 2 and 4, the lower portion of the ladder frame 21 is formed with a long hole 213, and the length direction of the long hole 213 is parallel to the length direction of the ladder frame 21. In this embodiment, the long holes 213 are aligned and opened at the bottoms of the two support columns 211. The elongated hole 213 is shaped as a kidney-shaped hole, and in other embodiments, the elongated hole 213 may be rectangular.

Referring to fig. 4 and 5, each strut 211 includes a web 2111, and a wing 2112 bent and extended outward from one side of the web 2111; the wing plates 2111 of the two support columns 211 extend oppositely, the step piece 212 is vertically connected to the web plates 2111 of the two support columns 211, and the long hole 213 is aligned and opened on the web plates 2111 of the two support columns 211.

The material of the piece of marking time 212 of this embodiment is the square steel, and when the piece of marking time 212 included one or two square steels, included two square steels, the length of increase atress for when the staff moved on the piece of marking time, it is more steady.

The material of the vertical ladder 2 is the same as that of the storage tank, and the vertical ladder is nickel-based alloy steel (X for short) with the nickel content of about 9 percent₇Ni₉) The length of the vertical ladder 2 is less than or equal to 6000mm, and the pillar 211 is less than or equal to 6000mm in this embodiment.

The expansion coefficient of the nickel-based alloy steel is 9.9 × 10^-6When the temperature in the storage tank is changed within the range of (+45 ℃ to-163 ℃), the extension length of the vertical ladder 2 is 208 × 9.9.9 9.9 × 10^-6× 6000 ≈ 13mm, therefore, the present embodiment has the long hole 213The length of the vertical ladder is set to be larger than 13mm, so that the requirement of the telescopic amount of the vertical ladder 2 in the temperature interval in the storage tank can be met, the connecting position of the vertical ladder 2 in the storage tank cannot be failed due to shearing force, and the reliability of the connection of the vertical ladder 2 in the storage tank is improved. In one embodiment, the length of the slot 213 is set to 20mm, which allows for some tolerance in the length of the slot 213 due to existing machining requirements.

Referring again to fig. 2 to 5, an upper ear plate 22 is integrally formed extending from the upper end of the ladder frame 21 for welding inside the tank. Go up otic placode 22 and pillar 211 integrated into one piece for go up the structure between otic placode 22 and the ladder frame 21 more firm, ladder frame 21 and last otic placode 22's connection is fixed simultaneously and need not utilize bolted connection, has reduced the use amount of bolt and construction bolt's work load, avoids the bolt to drop and causes the damage for other mechanisms in the storage tank. In this embodiment, the upper ear plate is formed extending from a side of the web 2111 facing away from the wing 2112.

The length direction of the upper ear plate 22 is perpendicular to the length direction of the ladder frame 21, and the upper ear plate 22 is positioned at the upper part of the ladder frame 21.

In this embodiment, the upper ear plate 22 is formed extending from the web 2111. The upper ear plate 22 is located at the top end of the web 2111. During production, the upper ear plate 22 and the support 211 are laid out together.

It will be appreciated that in other embodiments, the upper ear plate 22 may be welded to the web 2111 by welding, and the upper ear plate 22 is welded to the tank 1 when the vertical ladder 2 is installed in the tank 1.

Referring to fig. 2 and 6, the lower ear plate 23 is a plate-like structure for welding inside the tank. The lower ear plate 23 in this embodiment is a rectangular square plate. The lower ear plate 23 is provided with a circular hole 231. The round hole 231 is aligned with the long hole 213 so that the lower ear plate 23 and the lower portion of the ladder frame 21 can be fixedly coupled by the fastener 24 passing through the round hole 231 and the long hole 213. The lower ear plate 23 is parallel to the upper ear plate 22 and is located at the lower part of the ladder frame 21.

When the ladder frame 21 is extended and retracted, the fastening member 24 can move in the long hole 213, so that the connection points at the two ends of the ladder frame 21 are not loosened and the connection of the ladder frame 21 is more reliable when the ladder frame 21 is extended and retracted.

Referring to fig. 2 and 7, the fastening member 24 includes a bolt 241 and a nut 242, the bolt 241 is inserted into the elongated hole 213 and the circular hole 231, the nut 242 is screwed on the bolt 241, and the nut 242 is welded on the bolt 241. The nut 242 is welded to the bolt 241, so as to prevent the bolt 241 or the nut 242 from falling off after long-term use, and effectively protect other components in the storage tank, for example, the bolt 241 or the nut 242 can be effectively prevented from damaging blades of a deep-well pump in the storage tank, and the maintenance cost can be reduced. In this embodiment, two points between the nut 242 and the bolt 241 are spot-welded for reinforcement, and the welding point 243 between the nut 242 and the bolt 241 in this embodiment is located on the side of the nut 242 away from the pillar 211.

In the present embodiment, the number of the fastening members 24 is one, and in other embodiments, the number of the fastening members 24 may be plural, and the number of the corresponding circular holes 231 and the long holes 213 is also provided in plural.

In this embodiment, the ladder frame 21 is fixed in the tank body 1 by the upper lug plate 22 and the lower lug plate 23, the upper lug plate 22 and the lower lug plate 23 are both welded on the inner wall of the tank body 1, and the upper lug plate 22 and the ladder frame 21 are integrally formed, so that the upper lug plate 22 and the ladder frame 21 do not need to be welded or connected by bolts, the use amount of the bolts and the workload of installing the bolts are reduced, and the upper lug plate 22 and the ladder frame 21 cannot loosen.

The lower ear plate 23 is connected with the ladder frame 21 through a fastener 24, and the fastener 24 sequentially passes through a long hole 213 on the ladder frame 21 and a round hole 231 on the lower ear plate 23. Due to the shape of the long hole 213, when the ladder frame 21 expands with heat and contracts with cold, the fastener 24 can move in the long hole 213, so that the ladder frame 21 can move relative to the lower ear plate 23, and the connection of the two ends of the ladder frame is ensured when the ladder frame expands with heat and contracts with cold.

After the bolt 241 passes through the long hole 213 and the round hole 231, the nut 242 is mounted on the bolt 241, and then the nut 242 is welded on the bolt 241, so that the connection between the bolt 241 and the nut 242 is prevented from loosening, and the bolt 241 and the nut 242 can be effectively prevented from falling off.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. An in-tank vertical ladder of an LNG storage tank, comprising:

the lower part of the ladder frame is provided with a long hole, and the length direction of the long hole is parallel to the length direction of the ladder frame;

the upper ear plate is integrally formed by extending from the upper end of the ladder frame and is used for being welded in the storage tank;

the lower lug plate is used for being welded inside the storage tank, and a round hole is formed in the lower lug plate in a position corresponding to the long hole;

and the fastening piece penetrates through the round hole and the long hole so as to fix the lower part of the ladder frame on the lower ear plate.

2. The vertical ladder of claim 1, wherein the fasteners comprise bolts and nuts, the bolts are disposed through the elongated holes and the circular holes, the nuts are threaded onto the bolts, and the nuts are welded onto the bolts.

3. The vertical ladder according to claim 1, wherein the ladder frame comprises two parallel pillars spaced apart from each other, and a plurality of step members spaced apart from each other along the length of the pillars, each step member being vertically connected between the two pillars, the elongated holes being aligned and opened at the bottoms of the two pillars; the upper ear plate and the pillar are integrally formed.

4. The vertical ladder as claimed in claim 3, wherein each of the struts includes a web and a wing bent and extended outwardly from one side of the web; the upper lug plate is formed by extending from the other side of the web plate; the wing plates of the two support columns extend back to back, and the step part is vertically connected to the web plates of the two support columns.

5. The vertical ladder of claim 1, wherein the ladder frame has a length of less than or equal to 6000 mm.

6. The vertical ladder of claim 5, wherein the length of the slot is greater than 13 mm.

7. The vertical ladder of claim 6, wherein the slot is 20mm in length.

8. An LNG storage tank, comprising a tank body and a vertical ladder according to any one of claims 1 to 7 arranged in the tank body, wherein a manhole is arranged on the tank body, and the vertical ladder is positioned below the manhole; the upper ear plate and the lower ear plate are welded in the tank body.