JP3412059B2 - Storage tank anchor - Google Patents

Description

Detailed Description of the Invention

[0001]

This invention relates to liquefied natural gas (LN
G) and other double-shell flat-bottom cylindrical storage tanks, single-shell flat-bottom cylindrical storage tanks that store liquids such as petroleum at room temperature and pressure, or anchors such as spherical storage tanks Is.

[0002]

2. Description of the Related Art Single-shell and double-shell flat-bottom cylindrical storage tanks are
It is fixed to the foundation by anchors so that it will not float up, fall, or skid, even if a force such as internal pressure, earthquake, or wind is applied.

FIG. 4 shows an anchor of a conventional example in which an inner tank of a ground type double shell flat bottom cylindrical low temperature storage tank is fixed to a foundation. The double-shell steel flat-bottom cylindrical storage tank composed of the inner and outer tanks 100 and 111 has an upper end portion so that the inner tank 100 that directly stores the low-temperature liquid does not cause uplift or sideslip that floats up due to internal pressure or an earthquake. Mounting part 10 on the outer periphery of the inner tank side plate 103
Anchor of anchor strap 107 that is fixed to No. 5 and is inserted in the steel anchor box 110 provided at the middle part through the bottom cold insulation layer 109 and the outer tank bottom plate 112, and the lower end is embedded and fixed in the base 101. It is fixed to the foundation 101 by 104.

In the example shown in FIG. 4, a hinge-type connecting portion 106 is provided in the middle portion of the anchor strap 107 so that the inner tank 100 can follow the contraction within a permissible range even if the inner tank 100 receives and contracts the low temperature storage. This is the case.

Further, a plurality of high-strength tension members, which penetrate the side wall of the sealed concrete outer tank and are tensioned and fixed at both ends in the horizontal direction, are arranged in contact with the outer peripheral surface of the inner tank in the horizontal direction. The invention of an earthquake-resistant storage tank that holds a tank is disclosed in Japanese Patent Laid-Open No. Sho 60
-84497.

[0006]

The anchor 104 of the conventional example shown in FIG. 4 is large in the plate-shaped or rod-shaped anchor strap 107, anchor box 110, etc. made of steel, and is therefore heavy and difficult to carry and install. And
Since the side plate 103 and the like are constructed with the upper end of the anchor strap 107 constructed earlier protruding above the foundation,
The anchor strap 107 was damaged or the protruding anchor strap 107 interfered with the storage tank construction work.
Further, in the anchor 104 having a structure in which the hinge-shaped connecting portion 106 is provided in the middle portion of the anchor strap 107, alignment and connecting work are complicated. Also anchor 104
Has an anchor structure that independently and individually holds the inner tank 100, so there is a concern that the anchor 104 may be destroyed due to local force exerted by the movement of the inner tank 100 due to internal pressure or an earthquake.

Further, according to the invention disclosed in Japanese Patent Laid-Open No. 60-84497, a high-strength long tension material having a role of an anchor contacts the side surface of the inner tank to grip the inner tank.
Although it is possible to prevent horizontal slippage of the inner tank, it is not suitable for preventing the uplift of the inner tank from rising, and the tension material has a structure that indirectly suppresses the inner tank, so tension work of the tension material is easy. Was not.

The above-mentioned problems have been described in detail by taking an example of an above-ground double-shell flat-bottomed cylindrical low-temperature storage tank. However, a single-shelled flat-bottomed cylindrical tank for storing liquids such as petroleum at room temperature and pressure. Even if the anchor having the above-mentioned structure is used for the storage tank, the spherical storage tank, or the like, there are similar problems such as the anchor protruding from the foundation hindering the construction work of the storage tank and the problem of being unsuitable for uplift prevention.

The present invention has been made in view of the above-mentioned problems, and provides a storage tank anchor which is lightweight and easy to handle, is easy to construct and install the storage tank, and has an improved uplift prevention function. It is a thing.

[0010]

An anchor of a storage tank according to the present invention is fixed by being buried in a storage tank foundation by opening both ends upward.
A U-shaped sheath tube formed in a line shape to, together with and a steel wire is inserted into the sheath tube, only setting the mounting portion for fixing the ends of the steel wire on the outer circumference of the tank side plate, said sheath tube is the ends of the steel wire inserted through one formed by stressing anchorage to the mounting portion.

Further, stressing anchorage to the reservoir side plate outer peripheral attaching portion of the steel wire opposite ends, between the mounting portion adjacent between 1 or the mounting portion in which a plurality isolated walk combination isolation and the adjacent It is between the mounting parts.

[0012]

The anchor of the storage tank according to the present invention is formed into a line shape which is simultaneously embedded and fixed in the storage tank foundation together with the construction of the storage tank foundation.
The formed U-shaped sheath tube leave embedded fixed storage tank foundation open both ends of the sheath tube upwards, after reservoir construction, extends by inserting the steel wire to the sheath tube, said steel wire Both end portions are formed by tension fixing to the mounting portions provided on the outer periphery of the storage tank side plate.

Since the steel wire is formed as described above, the steel wire which is inserted into the U-shaped sheath tube having the loop portion which is embedded and fixed to the foundation in a long line shape and which is strained and fixed to the attachment portion of the storage tank side plate is Even if it is firmly fixed to the foundation in the downward direction and pulling force such as internal pressure or earthquake is applied in the upward direction, there is no concern that the steel wire will be pulled out from the foundation.

Further, a mounting portion for fixing both ends of the steel wire under tension.
Because are only set to隔接the outer periphery of the reservoir plate, the internal pressure,
Compared to the conventional anchor structure that individually suppresses the storage tank against movement such as reciprocating movement, rotation movement, and vertical movement of the storage tank due to earthquake or wind, the tension of the steel wire is dependent and interlocked with each other. Is adjusted so that the moving tank or the tank that is about to move can be efficiently and reliably suppressed, the force applied to the anchor that regulates the movement of the tank can be dispersed, and the local It eliminates the risk of destruction of various anchors.

If the both ends of the steel wire are tension-fixed to the outer peripheral mounting portions of the storage tank side plates between the adjacent mounting portions, the internal pressure is
It is easy to suppress the movement of stored items and storage tanks around the storage tanks due to earthquakes, winds, etc. It is easy to suppress the reciprocating movement of the storage tank by alternating up and down, and between the mounting parts that combine the adjoining and isolation, the storage tank due to the earthquake that starts from vertical movement and shifts to reciprocating movement and rotating movement It is easy to suppress complicated movements.

The anchor of the storage tank according to the present invention is
Unlike conventional anchor strap structures, there is no need to carry heavy anchor straps or difficult alignment work, so installation work is easy and a sheath tube formed by opening both ends upward so that it does not project ,
Since the steel wire can be inserted into the sheath tube that serves as a hollow guide guide after the storage tank is built and does not interfere with the construction of the storage tank by the workers' feet, the construction work of the storage tank is not disturbed at all. As a result, the storage tank can be constructed efficiently. In addition, the steel wire that has been tension-fixed to the mounting portion of the storage tank side plate can be removed or replaced for inspection and adjustment, so maintenance is easy.

Further, the anchor of the storage tank according to the present invention is
Unlike an anchor with a rigid structure such as a steel plate that is rigid like a conventional anchor strap structure, that is, because it is a flexible structure of steel wire that has flexibility, it can be used for movements such as contraction and expansion of the storage tank and movement of the ground. On the other hand, the movement of the storage tank can be suppressed by following it within the allowable range, and the steel wire will not be plastically deformed by the force of bending, twisting, bending, etc. that repeatedly acts due to the movement of the storage tank or the ground, so against fatigue fracture. However, it is also strong and durable.

[0018]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which the anchor of the storage tank according to the present invention is provided in a ground-type double-shell flat-bottom cylindrical low-temperature storage tank. 1 in the figure
Is a base of a steel double shell flat-bottomed cylindrical low-temperature storage tank composed of inner and outer tanks 11 and 2, 2 is a bottom plate of the inner tank 11, and 3 is a side plate of the inner tank 11.

In the figure, reference numeral 4 denotes an inner tank 11 for containing a low temperature liquid placed on a bottom cold insulation layer 14 on an outer tank bottom plate 13.
It is an anchor that is fixed to the foundation 1 so that it will not move due to uplifting, skidding, etc. due to an earthquake or the entry and exit of a low temperature liquid, or a change in pressure or temperature.

This anchor 4 has a U-shaped sheath tube 6 having a loop portion 7 formed with a curvature and a foundation 1 formed of concrete slab or the like. Both ends of the steel wire 8 which is fixed by embedding in a chord shape having an arcuate outer periphery and which is inserted into the sheath tube 6 are attached to the attaching portions 5 and 5 provided on the inner tank side plate 3 through the brackets 9, and the fixing tool 10 is used. It is formed by fixing and fixing by applying a tension of a predetermined strength, that is, a tension so that the storage liquid of the low temperature liquid is not loosened. In FIG. 1, the bracket 9 is provided so as to largely project from the side plate 3 so that the anchor 4 is vertical. However, in order to facilitate the construction of the anchor 4, the bracket 9 should be provided so as not to project too much from the side plate 3. Alternatively, the anchor 4 may be provided with a slight inclination toward the outside.

The sheath pipe 6 is formed by bending a steel pipe or the like having good adhesion to concrete to form a U-shape of a long hollow cylinder. When the foundation 1 made of concrete slab is constructed, the U-shape is used. The loop portion 7 at the lower part of the shape is fastened to the reinforcing bar of the foundation 1 by embedding and fixing it so that it does not move, and both ends of the sheath tube 6 penetrating the outer tank bottom plate 13 have bottom cold insulation layers 14
Stand up so that it does not protrude from the top of the
It is formed by opening on the surface of the bottom cold insulating layer 14.

The inner diameter of the sheath tube 6 is different from that of the steel wire 8 so that the steel wire 8 having a predetermined strength can be easily inserted after the predetermined concrete strength is obtained. Form large in size. Eg 1
When using a PC steel wire with a thickness of 2.4 mm, the inner diameter of the sheath tube is 28 mm for one wire, 40 mm for the two twisted wires, and 50 mm for the four twisted wires. Is formed to be large, and the steel wire 8 is inserted in a loose fitting shape so that the frictional resistance is small and the steel wire 8 can be slid and tensioned.

The steel wire 8 is formed of a flexible material such as PC steel wire as described above, and is attached to the sheath tube 6 at an appropriate time such as after the inner tank 11 has been constructed so as not to hinder the construction of the storage tank. It is inserted and formed by attaching the end portions of both ends to the attachment portions 5 and 5 of the inner tank side plate 3 with the tension of the predetermined strength.

The flexible steel wire 8 has a loop portion 7
It can be easily inserted into the sheath tube 6 that has a U-shaped hollow cylinder and serves as a guide, and the tension can be adjusted if necessary, and it can be removed and inspected and maintained. You can also

As described above, the sheath tube 6 does not protrude.
After the storage tank is constructed, the steel wire 8 is inserted through the sheath tube 6 and tension-fixed to the mounting portion 5 so that the anchor 4 does not interfere with the construction work of the inner and outer tanks 11 and 12, and the construction work is being performed. Also, the anchor 4 is not damaged.

A U-shaped sheath tube 6 having a loop portion 7 and formed in a long line shape is embedded and fixed in the foundation 1, and is inserted into the sheath tube 6 and provided in the inner tank side plate 3. Since the steel wire 8 is tensioned and formed on the mounting portion 5, the inner tank 11
The steel wire 8 inserted through the sheath tube 6 firmly fixed to the foundation 1 does not pull out and float up even if it receives an internal pressure or a force such as an earthquake because it is in line contact with the foundation 1.

Since both ends of the steel wire 8 are tensioned and fixed between the mounting portions 5 and 5 provided on the outer periphery of the inner tank side plate 3 to form the anchor 4, inner anchors due to internal pressure, earthquakes, etc. Tank 11
As compared with the anchor structure in which the inner tank 11 is individually and independently restrained against reciprocating movements, rotations, vertical movements, etc., both ends of the single steel wire 8 are tensioned and fixed to the mounting portions 5 and 5, and Since the tension of the steel wire 8 is adjusted in a subordinate and interlocking manner, the moving inner tank 11 or the inner tank 11 about to move is used as the foundation 1
1 can be fixed efficiently and securely, and the inner tank 1
The force applied to the anchor 4 that regulates the movement of 1 is dispersed, and it is released from local destruction of the anchor or the like.

Further, the anchor 4 formed of the steel wire 8 is
Since it is flexible and has a flexible structure, it can also follow the movement of the inner tank 11 due to internal pressure, earthquake, temperature contraction / expansion, etc. within an allowable range, so that repeated displacement and bending, It does not undergo plastic deformation due to twisting or bending, and has durability that is unlikely to deteriorate or break due to fatigue. Further, the steel wire 8 has sufficient strength and durability against the temperature of the stored liquid.

FIG. 2 shows a state in which the anchor of the storage tank according to the present invention is provided in a single-shell flat-bottomed cylindrical storage tank for storing liquid such as petroleum at room temperature and atmospheric pressure. In the figure, 21 is the base of a flat bottom cylindrical storage tank made of steel single shell, 22 is a bottom plate, and 23 is a side plate.

Anchor 24 for fixing the storage tank to the foundation 21
Is a U-shaped sheath tube 26 having a loop portion 27 formed with a predetermined curvature, which is attached to the foundation 21 such as a concrete slab so as not to project from the surface of the foundation 21.
Both ends of the sheath are opened and fixed by embedding, and the sheath tube 26
The both ends of the flexible steel wire 28 inserted through are attached to the mounting portions 25, 25 provided separately from the storage tank side plate 23 by tension fixing. In addition, the sheath tube 2 opened upward
If both ends of 6 are fitted with a lid or the like, rainwater or the like can be prevented from entering the sheath tube 26 and the durability can be increased.

The anchor 24 provided in the single-shell, flat-bottomed cylindrical storage tank shown in FIG.
6. Since the steel wire 28 and the mounting portion 25 are formed in the same manner as the anchor 4 provided in the double-shell flat-bottom cylindrical low-temperature storage tank shown in FIG. 1, even if pulling force such as internal pressure or earthquake is applied, the steel wire 28 28 is not pulled out from the foundation 21, and the steel wire 28 whose both ends are tensioned and fixed to the mounting portions 25, 25 of the storage tank side plate 23 moves up and down, reciprocates, and rotates due to an earthquake or wind. The steel wire 28
It goes without saying that the anchor 4 has the effect of being able to adjust and fix the tension to the foundation 21 efficiently and reliably and fix it.

FIGS. 3 (A) and 3 (B) are plan views showing the arrangement of anchors of the storage tank according to the present invention. In the figure, 31 is the foundation of the storage tank, 32 is the bottom plate, 33 is the side plate, and 34 is the side plate.
Is an anchor, and the anchor 34 is a mounting portion in which both ends of a steel wire 38 inserted through a U-shaped sheath tube 36 embedded and fixed in a chord shape having a circular arc on the outer circumference of the storage tank are provided on the storage tank side plate 33. 35, 35 are fixed and formed. The number of anchors 34 is determined according to the required fixing strength of the storage tank in consideration of the size of the storage tank, the load applied to the storage tank, and the like.

In FIG. 3 (A), both ends of a steel wire 38 having a U-shaped sheath tube 36 inserted between mounting portions 35, 35 provided adjacent to the storage tank side plate 33 have arcs on the outer circumference of the storage tank. It is a view showing an arrangement state of anchors 34 fixed and formed in a string shape.

The anchor 34 thus arranged is suitable for a relatively large-sized storage tank, and since it is possible to perform the mounting work by calling out in the neighborhood, the workability is excellent and the mounting parts 35, 35 adjacent to each other. Since the steel wire 38 is strained by, the stored liquid sloshs due to an earthquake or the like, and there is an advantage that it is easy to suppress the rotational movement of the storage tank moving up and down along the circumference of the storage tank due to the circumferential rotation.

In FIG. 3 (B), both ends of a steel wire 38, through which a U-shaped sheath tube 36 is inserted, between one or a plurality of mounting portions 35, 35 of the storage tank side plate 33, and the storage tank is formed into an arc. 3 shows an arrangement state of anchors 34 formed by fixing in a chord shape.

The anchor 34 thus arranged is suitable for a relatively small-sized storage tank and is laid through the inside of the lower foundation 31 of the storage tank bottom plate 32. Therefore, the anchor 34 has a structure that is stronger against uplifting and pulling force. , Mounting part 3 which is isolated and opposed
Since the steel wire 38 is strained between 5 and 35, the opposing bottoms of the storage tank move up and down alternately due to an earthquake or the like, that is,
It has the advantage that it is easy to suppress the reciprocating movement of the storage tank.

Although not shown, FIG. 3A and FIG.
The composite arrangement state in which the anchor arrangement state of (B) is combined, that is, the arrangement state in which the adjoining and the separation are combined and fixed between the mounting portions, is affected by the earthquake motion, and moves vertically or reciprocally, or rotates. It is possible to efficiently suppress the movement of the storage tank that makes complicated movements such as
It is possible to further increase the fixing force to the.

In the above-mentioned embodiment, the anchor of the steel flat-bottomed cylindrical storage tank is explained. However, the concrete flat-bottomed cylindrical storage tank, or the steel or concrete spherical storage tank, the horizontal cylindrical storage tank, the chimney. It goes without saying that the same can be applied to an anchor for fixing a tower or tower to a foundation.

[0039]

The anchor of the storage tank according to the present invention has a line shape in which both ends are opened upward and are embedded and fixed in the storage tank foundation.
An attachment that includes a formed U-shaped sheath tube and a steel wire that is inserted into the sheath tube, and that fixes both ends of the steel wire.
Only set the section to the outer periphery of the reservoir plate, since the both ends of the steel wire was inserted into the sheath tube is formed by stressing anchorage to the mounting portion, and fixed to the base firmly to the reservoir in the downward direction, the internal pressure and also the force of the earthquake or the like is applied to the upward direction, in the steel line basis
Since it is buried in a line shape, it is not pulled out, and the storage tanks that reciprocate and rotate due to internal pressure and earthquakes are mutually dependent and interlocked to adjust the tension of the steel wire, ensuring efficient and reliable operation. Can be suppressed to

When the both ends of the steel wire are fixed to the outer peripheral mounting portions of the storage tank side plates between the adjacent mounting portions, it is easy to suppress the rotational movement of the storage tank due to an earthquake or the like, and one or a plurality of separate mounting portions are installed. The space between the parts makes it easy to suppress the reciprocating motion of the storage tank due to an earthquake, etc., and the space between the mounting parts combining the adjoining and isolation allows the earthquake to start from the vertical movement and then move to the reciprocating and rotating motions. It has an advantage that it is easy to suppress the complicated movement of the storage tank.

The anchor of the storage tank according to the present invention is
Compared to the conventional anchor strap structure, the installation work is easier and the storage tank can be constructed efficiently, and the inspection, adjustment, and maintenance are easy, and it is strong against fatigue damage and has durability.

Therefore, it is possible to provide an anchor for a storage tank which is lightweight, easy to handle, easy to construct the storage tank, easy to attach the anchor, and has an improved function of preventing uplift.

[0043]

[Brief description of drawings]

FIG. 1 is a side cross-sectional explanatory view showing a state in which an anchor of a storage tank according to the present invention is provided in a double-shelled flat-bottomed cylindrical storage tank.

FIG. 2 is a partially cutaway perspective view showing a state in which the anchor of the storage tank according to the present invention is provided in a flat shell cylindrical storage tank having a single shell.

3 (A) and 3 (B) are plan explanatory views showing a disposition state of anchors of a storage tank according to the present invention with a part cut away.

FIG. 4 is a side cross-sectional explanatory view showing a conventional anchor with a part cut away.

[Explanation of symbols]

1,2,31 Foundation 100 Inner tank 2,13,22,32 Bottom plate 101 Foundation 3,23,33 Side plate 102,112
Bottom plate 4, 24, 34 Anchor 103 Side plate 5, 25, 35 Mounting part 104 Anchor 6, 26, 36 Sheath tube 105 Mounting part 7, 27, 37 Loop part 106 Connecting part 8, 28, 38 Steel wire 107 Anchor strap 9 Bracket 109 Bottom Cooling Layer 10 Fixing Tool 110 Anchor Box 11 Inner Tank 111 Outer Tank 12 Outer Tank 14 Bottom Cooling Layer

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 88/00-90/66 F17C 13/08 E02D 29/02-29/02 E04G 21/00-21/32 E04H 5 / 00-5/12 E04H 7/00-7/32 E04H 12/00-14/00

Claims (2)

(57) [Claims] And 1. A two ends a U-shaped sheath tube formed in a line shape to be embedded and fixed in the opening to the reservoir foundation upwards, together with and a steel wire is inserted into the sheath tube, both ends of the steel wire only set a mounting portion for fixing a part on the outer periphery of the reservoir plate, the anchor reservoir, characterized in that the ends of the steel wire was inserted into the sheath tube formed by stressing anchorage to the mounting portion. 2. A tension fixing to tank side plate outer peripheral attaching portion of the steel wire at both ends is between the attachment portions adjacent the combination between the mounting portion 1 or the plurality isolated walk the isolation between the adjacent The anchor of the storage tank according to claim 1, wherein the anchors are provided between the respective attachment parts.