JP4078092B2 - Liquid breakwater for cryogenic liquid storage tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improvement of a breakwater installed around a low-temperature liquefied gas storage tank of LNG, LPG, LN ₂ , LO _X , DME, ethylene glycol or the like.
[0002]
[Prior art]
The breakwater installed around the low-temperature liquefied gas storage tank prevents the liquid from flowing out of the storage tank when the liquefied gas in the storage tank leaks during a disaster such as an earthquake, and It is set as the structure which has a function which prevents that it gasifies rapidly by contact.
[0003]
FIG. 6 shows a schematic configuration of a breakwater installed around the cryogenic liquefied gas storage tank. In the figure, A is a storage tank, B is a liquid breakwater, b ₁ is a floor surface portion constituting the liquid breakwater, b ₂ is a wall surface portion, and b ₃ is a liquid collection portion.
The structure shown in FIGS. 7-9 is known as a floor part which comprises the said breakwater.
[0004]
In the floor portion shown in FIG. 7, a level adjusting sand layer 2 is formed on the upper surface of the ground 1, a concrete segment 3 is laid thereon, and a foam glass segment 4 for a heat insulating layer is further integrated thereon with an adhesive. The structure is spread out.
[0005]
The floor surface part shown in FIG. 8 is shown as a repair example (or a new example) when the heat insulating material (foam glass segment) of the existing floor surface part shown in FIG. 7 is deteriorated. 4, the concrete segment 3, and the sand layer 2 are removed, and a part of the ground 1 is dug down. Then, a crushed stone is laid as a roadbed 5, concrete 6 is placed thereon, an anchor member 7 is taken out therefrom, and a reinforcing wire mesh 8 Then, obsidian pearlite concrete 9 is cast as a heat insulating layer.
[0006]
The floor portion shown in FIG. 9 is shown as an improved example (or a new example) of the floor portion in FIG. 7, and only the foam glass segment 4 in FIG. 7 is removed, and the anchor member 10 is driven into each concrete segment 3. A reinforcement wire mesh 8 is attached to this, and obsidian pearlite concrete 9 is cast as a heat insulating material.
[0007]
[Problems to be solved by the invention]
Of the floor surfaces shown in FIG. 7 to FIG. 9, those using the bubble glass segment 4 as the heat insulating material in FIG. 7 are aged over 5 to 10 years after construction due to rainwater / ultraviolet rays. Cannot be maintained. For this reason, as shown in FIG. 8, the existing heat insulating material and the segment are removed, the floor concrete is dug up, and the foundation concrete 6 is placed thereon, in order to reinforce the heat insulating material and prevent the floating when submerged. An anchor and a reinforcing wire mesh are installed, and heat insulating concrete with the required thickness is placed.
[0008]
Moreover, as shown in FIG. 9, only the existing foam glass segment for heat insulating materials is removed, an anchor bolt is disposed on the remaining concrete segment, a similar reinforcing bar 8 is provided, and heat insulating concrete is cast.
[0009]
Of the above-mentioned structures of the floor surface part, the structure of the floor surface part shown in FIG. 8 does not change the level of the existing foam glass segment, so the capacity of the breakwater does not change, but it is suitable for digging and waste material treatment. A large amount of money is required.
[0010]
In addition, although the structure of the floor portion shown in FIG. 9 is effective in reducing waste materials, the level after the placement of the heat insulating material is higher than in the case of foam glass, and the capacity of the liquid breakwater is reduced accordingly. There is a problem to do.
[0011]
On the other hand, regarding the heat insulation thickness of the heat insulating material for suppressing initial evaporation, the initial evaporation rate is 15 × 10 ⁻³ × t ^−0.5 cm / sec or the apparent thermal conductivity is 0.031 kcal / m ^2. If sec ^0.5 ° C. or lower, the heat exchange between the heat insulating material and the low-temperature liquefied gas is performed in the initial 3 minutes, and the quasi-steady state is entered. The necessary heat insulating material thickness is calculated to be 25 to 35 mm.
[0012]
However, if the insulating concrete into which the reinforcing bar is inserted does not have a casting thickness of 50 mm or more, the surface will appear on the surface with the accuracy of the reinforcing bar, or cracks may occur because the insulating concrete covering thickness is small.
In addition, when there is no margin in the capacity of the liquid breakwater and the liquid collection tank provided therein, it is necessary to take measures such as digging the floor surface, which becomes a high cost factor.
[0013]
The present invention has been made in view of the above problems, and in a breakwater of a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment, first, a means for attaching an anchor member to the concrete segment is simplified. By eliminating the need for reinforcing bars and casting molds embedded in the heat insulating concrete, it is possible to reduce the number of man-hours for the portion and reduce the amount of heat-insulating concrete, and The purpose is to provide a breakwater for cryogenic liquid storage tanks that can reduce raw material costs.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a liquid barrier of a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment by casting, and an anchor member is provided at a butt joint portion of the concrete segment. The seat plate-like member embedded in the heat insulating concrete to be placed in the portion where the anchor member protrudes from the joint portion of the concrete segment is inserted and disposed in a state where the lower end portion can be locked to the concrete segment. The gist is that it is attached.
[0015]
The gist of the invention of claim 2 is that, in claim 1, the heat insulating concrete layer contains alkali-resistant fibers or metal reinforcing fibers.
[0018]
According to a third aspect of the present invention, there is provided a breakwater for a low-temperature liquid storage tank in which heat insulating concrete is laminated on a spread concrete segment by placing an anchor member at a butt joint portion of the concrete segment. A seat plate-like member embedded in the heat insulating concrete layer to be placed is attached to a portion where the anchor member protrudes from the joint portion of the concrete segment, and is inserted and arranged in a state where it can be locked to the concrete segment, On the concrete segment, as a formwork for placing heat insulating concrete, a formwork material that is integrated with heat insulating concrete and has cushioning properties that can follow the expansion and contraction of heat insulating concrete due to temperature change is fixed. To do.
[0019]
The gist of the invention of claim 4 is that, in claim 3, the heat insulating concrete layer contains alkali-resistant fibers or metal reinforcing fibers.
[0020]
According to a fifth aspect of the present invention, there is provided a method for constructing a breakwater in a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment by placing an anchor member, and a lower end portion of the anchor member is made of concrete. A step of inserting and arranging in a state that can be locked to the segment, and a step of attaching a seat plate-like member embedded in the heat-insulating concrete to be placed to a portion where the anchor member protrudes from the joint portion of the concrete segment. This is the gist.
[0021]
According to a sixth aspect of the present invention, in the method for constructing a breakwater of a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment, an anchor member is provided at a butt joint portion of the concrete segment, and the lower end portion is made of concrete. Inserting and arranging in a state where it can be locked to the segment, attaching the seat plate-like member embedded in the heat insulating concrete to be placed on the portion where the anchor member protrudes from the joint part of the concrete segment, Fixing a mold material having a cushioning property that is integrated with the heat insulating concrete and can follow the expansion and contraction of the heat insulating concrete due to a temperature change, as a form for placing the heat insulating concrete on the concrete segment. The gist.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
As a preferred embodiment of the present invention, as shown in FIG. 1, an L-shaped anchor member is formed at a butt joint portion of a segment 3 in a breakwater composed of a ground 1, a sand layer 2, a concrete segment 3 and a cast insulation concrete 4. 11 is inserted, and the anchor member has its lower end bent portion locked to the lower surface of the concrete segment, and a ring-shaped seat plate member made of expanded metal lath via a nut 12 at the tip portion protruding above the joint portion. 13 is fixed.
The shape of the seat plate-like member 13 is not limited to an annular shape, and may be a square shape or the like, and the size is preferably in the range of 50 to 400 cm ² .
[0023]
On the other hand, after the mold material 14 made of soft urethane foam is erected at a required portion on the concrete segment 3, and the mold material 14 is fixed using the angle material 15, the holding plate 16, the wedge screw 18 and the like, A heat insulating concrete 4 is placed and configured.
[0024]
【Example】
1 to 5 show an embodiment of a floor portion of a liquid breakwater according to the present invention. In addition, the same code | symbol is attached | subjected to the same or similar member as FIGS.
1 to 5, reference numeral 1 denotes a ground, 2 denotes a sand layer, 3 denotes a concrete segment, and an L-shaped anchor member 11 is inserted into a butt joint portion of the concrete segment 3. The anchor member has its lower end bent portion locked to the lower surface of the concrete segment, and an annular seat plate-like member 13 made of expanded metal lath is fixed to a tip portion protruding above the joint portion via a nut 12. .
The seat plate member 13 is preferably fixed at a height of 5 to 15 mm from the upper surface of the concrete segment 3.
[0025]
On the other hand, on the concrete segment 3, a mold material 14 made of soft urethane foam or polyethylene foam is erected at a required portion thereof. As means for erecting the formwork material 14, the concrete 3 is fixed via an angle material 15 and a presser plate 16 in the example of FIGS. 1 to 3. Reference numeral 17 denotes a nail connected to the mold member 14 and the angle member 15, and reference numeral 18 denotes a screw in which the presser plate 16 is wedged to the horizontal joint portion of the concrete segment 3.
Further, as shown in FIG. 4, the mold member 14 may use means for pressing the angle member 15 at one end of the Z-shaped anchor member 19 inserted into the horizontal joint portion of the concrete segment 3.
[0026]
FIG. 5 shows the area where the heat insulating concrete layer is placed by the formwork material 14 standingly fixed on the upper surface of the concrete segment 3 laid down. In the figure, reference numeral 13 denotes an annular seat plate member made of the expanded metal lath.
[0027]
As the heat insulating concrete layer, an alkali resistant fiber having a fiber diameter of 13.5 to 18 μm and a cut length of 9 to 25 mm or a metal reinforcing fiber having a wire diameter of 0.3 to 0.55 mm and a length of 15 to 25 mm is mixed with the heat insulating concrete. What mixed 3 to 5% by volume ratio at the time of kneading is preferable.
[0028]
【The invention's effect】
As described above in detail, according to the structure of the breakwater according to the present invention, the following effects can be obtained while maintaining the performance against the conventional initial evaporation.
[1] No need for internal reinforcing bars for heat insulating concrete, and it is possible to cast with less than or equal to the thickness of the existing heat insulating layer, and can be constructed without affecting the capacity of the breakwater or collection tank .
[2] By reducing the amount of insulation concrete to be placed (50 mm to 30 mm), the raw material can be reduced by about 40% even by simple calculation and by about 20% even if the uneven surface of the floor is taken into consideration.
[3] By changing the anchor bolt to a hook type to the concrete segment, the man-hours for this part can be halved.
[4] By eliminating the reinforcing bars of the insulating concrete and changing the formwork to the embedded type, the man-hours for this part can be halved. Even if the raw material costs due to the reinforcing fibers are added, the cost is lower than that of the conventional breakwater structure. Can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main portion of a breakwater in a cryogenic liquid storage tank showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of an anchor member attachment portion.
FIG. 3 is an enlarged cross-sectional view of a mounting portion of a mold material.
FIG. 4 is an enlarged cross-sectional view showing a modified example of the attachment part of the mold material.
FIG. 5 is a plan view of the main part of the breakwater.
FIG. 6 is a schematic configuration diagram of a breakwater in a cryogenic liquid storage tank.
FIG. 7 is a sectional view of a main part of a conventional liquid breakwater.
FIG. 8 is a sectional view of a main part of a conventional liquid breakwater.
FIG. 9 is a sectional view of a main part of a conventional liquid breakwater.
[Explanation of symbols]
A Low temperature liquid storage tank B Liquid breakwater b ₁ Floor part b ₂ Wall part b ₃ Liquid collecting part 1 Ground 2 Sand layer 3 Concrete segment 4 Foam glass segment 5 for heat insulation layer Roadbed 6 Casting concrete 7 Anchor 8 Reinforcing bar 9 For insulation layer Obsidian perlite concrete 10 Anchor 11 Anchor member 12 Nut 13 Ring-shaped seat plate member 14 Form material 15 Angle material 16 Holding plate 17 Nail 18 Screw 19 Z-shaped anchor member

Claims (6)

 In a breakwater of a cryogenic liquid storage tank that is made by laminating insulating concrete on a concrete segment that has been laid down, an anchor member is inserted into the butt joint of the concrete segment so that its lower end can be locked to the concrete segment And a seat plate member embedded in the heat insulating concrete to be placed is attached to a portion where the anchor member protrudes from the joint portion of the concrete segment. Liquid bank.  2. A liquid breakwater for a cryogenic liquid storage tank according to claim 1, wherein the heat-insulating concrete layer contains alkali-resistant fibers or metal reinforcing fibers.  In a breakwater of a cryogenic liquid storage tank that is made by laminating insulating concrete on a concrete segment that has been laid down, an anchor member is inserted into the butt joint of the concrete segment so that its lower end can be locked to the concrete segment A seat plate member embedded in the insulating concrete layer to be installed is attached to a portion where the anchor member protrudes from the joint portion of the concrete segment, and the insulating concrete is placed on the concrete segment. A liquid-proof embankment for a cryogenic liquid storage tank, wherein a mold material having a cushioning property that is integrated with heat-insulating concrete and can follow expansion and contraction of heat-insulating concrete due to temperature change is fixed as an installation form.  4. The liquid breakwater for a cryogenic liquid storage tank according to claim 3, wherein the heat insulating concrete layer contains alkali-resistant fibers or metal reinforcing fibers.  In a construction method of a breakwater for a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment by placing the anchor member, the anchor member is placed at the joint portion of the concrete segment so that its lower end can be locked to the concrete segment. A low-temperature liquid comprising: a step of inserting and arranging; and a step of attaching a seat plate-like member embedded in heat-insulating concrete to be placed to a portion where the anchor member protrudes from the joint portion of the concrete segment. How to construct a tank breakwater.  In a construction method of a breakwater for a cryogenic liquid storage tank in which insulating concrete is laminated on a spread concrete segment by placing the anchor member, the anchor member is placed at the joint portion of the concrete segment so that its lower end can be locked to the concrete segment. A step of inserting and arranging, a step of attaching a seat-plate-like member embedded in the heat insulating concrete to be placed in a portion where the anchor member protrudes from the joint portion of the concrete segment, and a heat insulating concrete on the concrete segment. And a step of fixing a mold material having a cushioning property that can be integrated with heat insulating concrete and can follow expansion and contraction of the heat insulating concrete due to temperature change. Construction method of the breakwater.

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