JP6517581B2 - Method of reinforcing existing spherical tank with steel tube brace - Google Patents

Description

  The present invention relates to a method for reinforcing an existing storage tank for storing spherical high-pressure gas and the like, in which steel tube braces are attached to cross a column supporting a tank.

  Spherical tank brace structures include steel tube braces and tie rod braces. These are required to have sufficient strength as a reinforcing material for earthquake resistance and the like. With regard to high-pressure gas facilities, seismic design is required under the High-Pressure Gas Safety Act and the Act on Ensuring the Security of Liquefied Petroleum Gas and Properizing Transactions, but it occurred on March 11, 2011 (2011) In the light of accidents resulting from the Great East Japan Earthquake, the need for a review of the strength of the braces has been reaffirmed.

  Among the above braces, with regard to steel tube braces, some of the “High-pressure gas facilities such as high-pressure gas equipment earthquake resistant design standards” related to the High Pressure Gas Safety Act have been revised (implemented January 1, 2014 (2014)) For the spherical tank to be newly established, examination of the strength at the intersection of the steel tube braces is newly defined. In addition, "necessary reinforcement" which does not require this strength examination was newly defined by partial revision of "about operation and interpretation of earthquake resistant design standard such as high pressure gas equipment" (implemented on the same date as above).

  With regard to the spherical tank newly established etc. before the implementation date of the partial revision of the above "High-pressure gas equipment etc. earthquake resistant design standard", although compliance with the seismic design standard after this revision is not legally obliged, With notice, we perform earthquake-resistant evaluation based on the said earthquake-resistant design standard, and technical advice to the effect that we should perform earthquake-resistant reinforcement as needed is made (2014 (2014) May 20, 2014 dated 20140519 Commerce Bureau) The first issue “A measure to improve earthquake resistance of existing high-pressure gas equipment”. As a more concrete way, the business operator carries out aseismatic evaluation based on the above-mentioned aseismic design criteria in the above notification, and as a result, for facilities recognized not to have sufficient earthquake resistance, repair plan It is stated that a plan of measures for security between formulation and repair is formulated and reported to prefectures.

  As a method of reinforcing the steel pipe brace of a spherical tank (referred to as "existing spherical tank" in this specification) already installed, for example, diaphragm reinforcement and penetration gusset reinforcement may be mentioned (see Non-Patent Documents 1 and 2).

  However, these reinforcement methods require construction with the use of fire. Therefore, in many cases, such as existing spherical tanks being containers for combustible storage, these methods can not reinforce the steel tube brace during tank operation. That is, in these methods, it is necessary to stop the operation of the tank and perform the reinforcement work, resulting in an economic loss associated with the shutdown.

  Measures to reduce the level in the tank can be considered as measures to avoid the use of fire.

  However, this method also has to impose operational constraints due to storage capacity reduction.

  In addition, even if the existing spherical tank is not a container for storing combustibles, reinforcement work requiring fire during tank operation is not desirable, and in the above diaphragm reinforcement and penetration gusset reinforcement, the diaphragm is attached during construction. Since it is expected that the strength of columns and steel tube braces will temporarily decrease, it is necessary to stop the operation of the tank and carry out reinforcement work.

  Furthermore, it is desirable to minimize the addition of new burden to the existing spherical tank as much as possible. For example, when the weight of the equipment after construction increases, it is necessary to consider that the seismic force acting on this increases, the stress generated in each part increases, and the burden on the foundation or the ground to support also increases.

  Currently, with regard to the existing spherical tank, as a method of reinforcement such as earthquake resistance, for reinforcement without stopping the operation of the tank, not being restricted by the operation, and capable of suppressing unnecessary load on the equipment as much as possible. New methods are strongly desired.

Ministry of Economy, Trade and Industry 2013 1112 Commerce Bureau first Ministry of Economy, Trade and Industry 20140519 Commerce Bureau first

  The present invention has been made in view of the above problems, and for existing spherical tanks having steel pipe braces, reinforcement work such as earthquake resistance can be performed without stopping operation, and operation restrictions such as liquid level reduction can be reduced. It is an object of the present invention to provide a method for reinforcement that is not received and does not cause an unnecessary burden on equipment.

  In existing spherical tanks with steel tube braces, high stress occurs at the intersection of steel tube braces (long braces that are long steel tube braces and short braces that is short steel tube braces), struts and steel tube braces In view of the connection part, it is effective and important to emphasize these places in a reinforced manner such as earthquake resistance in the existing spherical tank.

From the above, according to the present invention, as the first aspect, an existing installation in which a long brace which is a long steel pipe brace and a short brace which is a short steel pipe brace crosses and is attached to a column supporting a tank. It is a reinforcement method of a spherical tank, and
(A) providing a support post first opening for filling and filling a lower support mortar (lower mortar) inside the lower end of the support;
(B) filling the lower mortar from the pillar first opening, filling the lower mortar at a lower inner side of the pillar and at a position where the long brace or the short brace is attached;
(C) closing the support post first opening;
(D) providing each pillar with a pillar second opening for injecting and filling the pillar upper mortar (upper mortar) and the filling into the upper inside of the pillar;
(E) The filling material is placed on the lower mortar from the second pillar opening so that the upper mortar is disposed at the upper inner side of the column and at the position where the long brace or the short brace is attached. A step of injecting
(F) pouring an upper mortar onto the filling from the pillar second opening, and filling the upper mortar at the position described in (e);
(G) closing the support post second opening;
(H) providing an elongated brace opening in each elongated brace for injecting and filling a filling and mortar inside each elongated brace;
(I) Filling the lower inside of the long brace from the long brace opening so that the mortar is disposed at the inner side of the long brace and at which the long brace and the short brace intersect Injecting a substance,
(J) injecting a mortar from the long brace opening onto the filling, and filling the mortar at the position described in (i);
(K) closing the long brace opening;
The present invention provides a reinforcement method of an existing spherical tank having:

As a second aspect, the present invention provides an existing spherical shape in which a long brace, which is a long steel pipe brace, and a short brace, which is a short steel pipe brace, are intersected and attached to a column supporting a tank. How to reinforce the tank,
(A) providing a support opening in each support;
(B) injecting a mortar from the column opening, and filling the lower mortar at a lower inner side of the column and at a position where the long brace or the short brace is attached;
(C) injecting a filler from the opening of the column onto the lower mortar so that the upper mortar is disposed at the upper inner side of the column and at the position where the long brace or the short brace is attached; ,
(D) injecting mortar from the column opening onto the filling and filling the upper mortar at the position described in (c);
(E) closing the post opening;
(F) providing each of the long braces with a long brace opening;
(G) filling the lower inside of the long brace from the long brace opening so that the mortar is disposed at the inner side of the long brace and at which the long brace and the short brace intersect Injecting a substance,
(H) pouring a mortar onto the filling from the long brace opening, and filling the mortar at the position described in (g);
(I) closing the long brace opening;
The present invention provides a reinforcement method of an existing spherical tank having:

  According to the reinforcement method of the present invention, since construction can be performed without using fire, reinforcement work such as earthquake resistance can be performed during operation of the existing spherical tank.

  In addition, since reinforcement work can be performed during tank operation, construction can be performed without being influenced by the tank opening time, and compared with the case where operation is stopped and construction is performed during the opening period, earthquake resistance etc. It can do reinforcement.

  Furthermore, in the method of the present invention, since it is not necessary to change the conditions such as the reservoir capacity, there is no operating restriction as in the case of the liquid level reduction measure.

It is a figure which shows an example of the existing spherical tank which has a steel pipe brace. It is the figure which expanded and showed an existing support column of the existing spherical tank, and a part of the existing steel pipe brace (long brace and short brace). It is a figure which shows the process in one Example of this invention. 3 to 11 are diagrams according to the same embodiment. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process in one Example of this invention. It is a figure which shows the process (at the time of completion) in one Example of this invention. It is a figure which shows the analysis object in a comparison experiment. It is a figure which shows the analysis object in a comparison experiment. It is a figure which shows the result (average stress in the steel pipe inner surface) of comparative experiment. It is the schematic of mortar unfilled (Case 1), mortar partial filling (Case 2), and mortar full filling (Case 3).

  Hereinafter, an embodiment according to the reinforcing method of an existing spherical tank according to the present invention will be specifically described with reference to the drawings.

Example 1
FIG. 1 shows an example of an existing spherical tank 1 having a steel pipe brace. In such a spherical tank, the long brace 3 which is a long steel pipe brace and the short braces 4a and 4b which are short steel pipe braces are attached to cross a pole 2 which supports the tank. There is a space inside the column 2 and the long brace 3.

  FIG. 2 is an enlarged view of a part of the existing column of the existing spherical tank and the existing steel pipe brace (long brace and short brace). As shown in FIG. 2, in the column braces (2, 2) and the steel pipe braces (3, 4a, 4b) attached between them, there are four joint parts (A, B, C, D) of the pillars and the steel pipe braces. There is one crossing point (E) of steel tube braces (long braces and short braces). When shaking occurs due to an earthquake, etc., high stress is generated at these junctions (A, B, C, D) and intersection (E) (Note that A to E in FIG. Is shown in The reinforcement method of the present invention intensively reinforces these junctions / intersections and their surroundings. This reinforcement is achieved by partially filling the inside of the struts and the long braces with mortar.

  The steps of the reinforcing method of the present invention are as follows.

  In the present invention, the lower part of each support column where the steel pipe brace is attached (around the point shown by A and B in FIG. 2 and its periphery) is reinforced with mortar from the inside of the support column. Therefore, first, as shown in FIG. 3, a pillar first opening 5 for injecting and filling mortar inside the lower part of each pillar is provided in each existing pillar 2.

  If the mortar is dropped from a high position as it is, the components (mainly cement, water, fine aggregate) become nonuniform due to the impact of the drop, which may affect the performance after hardening of the mortar. In the present embodiment, this problem is dealt with by separately providing the pillar first opening 5 closer to the lower part of the pillar than the pillar second opening described later and the pillar second opening.

  The method of the present invention can be applied even during tank operation, and this is one of the major features of the present invention, but when using the method of the present invention during tank operation, The opening operation for providing the column first opening 5 (the same as the opening operation for the other openings described later) is a method that does not use fire (for example, an air-driven drill or holsau, a steel pipe and its drill or holso teeth Perform with a dedicated jig that does not expose the place of contact. The support first opening, the support second opening and the long brace opening described later calculate the appropriate shape, inner diameter, area, etc. in consideration of the strength of the support and brace.

  The pillar first opening 5 is located above the position where the lower mortar (also referred to as “poster lower mortar” or “lower mortar” herein) is filled (for example, the lower mortar 6 shown in FIG. 4 is filled) It shall be provided in about 1 m or less upwards from the upper end 7 of the range.

  Next, a mortar for the lower part is injected from the support first opening 5, and it is a lower inner side of the support 2, and a position where one end of the long brace 3 and the short brace 4b is attached (B and A in FIG. 2) Fill the lower mortar around the area shown and appropriately around it.

  FIG. 4 shows the state after the lower mortar 6 is filled. The range of this filling includes the range 18 from the inner lower end 8 of the support 2 to the upper end 9 of the portion where the long brace 3 and the short brace 4 b are joined to at least the support 2 (at least this range covers Filling, as appropriate), in consideration of effectively reinforcing the strength, it is preferable to fill over this range to a suitable upper level.

  The injection of the lower mortar from the column first opening 5 can be performed via a hose or a pipe (the same applies to the injection of the mortar and the filling material described below).

  The lower mortar (same for mortars other than the lower one) may be injected in a pre-calculated amount, may be injected visually, or both may be performed. If visual inspection is to be performed, provide an opening for visual observation on the support post as appropriate (close after work is completed).

  The lower mortar used in the present invention (same for mortars other than the lower one) is mainly made by mixing cement, water and fine aggregate, and it may be a general one. A non-shrink mortar which does not cause drying shrinkage even after curing is suitable.

  The mortar is in the form of a slurry at the time of manufacture and pouring, but solidifies with the passage of time and adheres or adheres to the inside of the support. This reinforces the mortar filling point.

  After the lower mortar 6 is filled, the support post first openings 5 provided in each support 2 are closed. The closing can be performed using a screw plug or the like. For example, using a washer having a surface that conforms to the outer peripheral curvature of the support 2 and sealing with a hexagonal bolt or bolt / nut is preferable because the contact surface between the support and the closing member can be increased and it can be firmly closed. The state after closing the pillar first opening 5 is shown by a broken line in FIG.

  The reinforcement of the support is also provided at the upper part near the place where the steel tube brace is attached, that is, the position where the long brace and the short brace are attached (around the point shown by C and D in FIG. Reinforce the mortar by filling and placing it inside the column. Therefore, as shown in FIG. 5, a pillar second opening 10 for injecting and filling a mortar upper mortar (upper mortar) inside the upper portion of the pillar is provided in the existing pillar 2.

  The pillar second opening 10 is above the position where the upper mortar (and the filling to be described later) is filled (for example, within about 1 m upward from the upper end 12 of the filling range of the upper mortar 11 shown in FIG. 7) It shall be provided in

  Here, in the present invention, the filler is first injected from the pillar second opening 10.

  As described above, in existing spherical tanks with steel tube braces, high stress occurs at the intersection between steel tube braces (long braces that are long steel tube braces and short braces that is short steel tube braces), columns And the connection of steel tube braces. Therefore, it is effective to intensively fill mortar in these places and reinforce strength.

  On the other hand, if the mortar is filled beyond these locations, the increase in weight will increase the seismic force acting on the spherical tank, and the stresses generated on the support, brace and base plate of the spherical tank will increase. Also, with the increase in weight, the burden on the foundation and ground supporting the spherical tank also increases. Filling of mortar beyond the necessary part is not desirable to minimize the burden on the spherical tank and the foundation and ground.

For example, comparing Case 2 (partial filling of mortar according to this example) in the comparison experiment described below with a case (Case 3) in which the same mortar is filled instead of the filling at the filling point of Case 2 filling. (Note that the tank volume is 3000 m ³ , the number of columns is 12, the tank weight before reinforcement is approximately 390 tons, the specific gravity of mortar is 2.40 ton / m ³ , the specific gravity of filling is 0.09 ton / m ³ ), Case 2 is a column and If the total volume of mortar and filling to be filled in a long brace is 2.097 m ³ and the total weight is about 12.660 tons, in Case 3, the total volume of mortar to be filled in a post and a long brace is also the same Although it is 2.097 m ³ , its total weight is about 60.423 tons. In this case, the weight of the tank increases by about 16% in Case 3 (full mortar filling) as compared with the case where the mortar is not filled (Case 1), whereas in Case 2 (the present invention), the increase is about Stay at 3%. A schematic diagram of Case 1, Case 2 and Case 3 is shown in FIG.

  As described above, the mortar is mainly produced by mixing cement, water and fine aggregate, and it is in the form of slurry immediately after mixing, approaches solid with the passage of time, and finally becomes solid. The mortar is poured in the form of a slurry and therefore flows downward by its own weight. As a result, the mortar remains at the lower inside of the column and the lower inside of the brace, and partial filling of the mortar into the upper part of the column and the brace connection can not be realized.

  As mentioned above, in order to carry out partial filling of mortar to a pillar upper part and a brace, the structure which supports slurry mortar is needed. In the present invention, a filler is used as a structure for this support.

  That is, in order to partially fill the upper mortar around the position where the long braces or the short braces are attached inside the upper portion of each pillar, the lower mortar 6 previously filled is used to reinforce these portions. After hardening, the filler is injected from the column second opening 10 toward the upper side of the lower mortar 6.

  FIG. 6 shows the state after the filling material 17 is filled in the support 2. The filling is carried out so that the upper mortar 11 described later will be filled at an appropriate position. The upper mortar 11 needs to be filled at least in the area 13 that covers the part where one end located on the upper part of the long brace 3 and the short brace 4 a is joined to the support 2 but effectively reinforcing the strength It is preferable to fill up to an appropriately wide range beyond this range 13 (both the upper end 14 and the lower end 15 of this range 13). Therefore, it is preferable to fill the filler so that the lower end 16 (see FIG. 7) of the upper mortar 11 is located slightly below the lower end 15 of the range 13.

  In the present invention, the filling (including not only the one injected into the column but also the one injected into the long brace) can be attached to the inside of the column or brace by hardening of the mortar filled on the filling. It is necessary to be able to support the mortar and to be noncombustible until it is fixed. It is preferred that the weight is relatively light. From such a viewpoint, for example, granular perlite can be used as the filler.

  The filling may be injected in a pre-computed amount, may be injected visually, or both. If visual inspection is to be performed, provide an opening for visual observation on the support post as appropriate (close after work is completed).

  In addition, when installing a new tank (before tank operation) or stopping the operation of an existing spherical tank and replacing the steel pipe brace etc. with a completely different one (use fire for this replacement work It is inevitable that the operation of the tank needs to be stopped), or that the mortar can be partially filled by a method such as providing a partition in the column or brace. However, it is impossible to use the above method while continuing the operation in the existing spherical tank, because it becomes essential to use fire for replacement work and it will not be possible to maintain the current strength. .

  After filling the filling material, mortar for the upper part is poured from above the column second opening 10 toward the filling material 17 and the position where the long brace 3 and the short brace 4a are attached (C, D in FIG. 2) Fill the top mortar around the area shown in). The upper mortar solidifies with the passage of time and adheres to the inside of the pillar 2. Thereby, the mortar filling part of the support | pillar 2 is reinforced.

  As described above, the upper mortar 11 needs to be filled at least in the area 13 which covers a portion where one end located on the upper part of the long brace 3 and the short brace 4 a is joined to the support 2. In consideration of reinforcement, it is preferable to fill the region 13 to an appropriately wide range beyond this range 13 (both the upper end 14 and the lower end 15 of the range 13). FIG. 7 shows the state after the upper mortar 11 is filled.

  After the upper mortar 11 is filled, the pillar second openings 10 provided in the respective pillars are closed. The closing in this case can also be performed using a screw plug or the like. Further, for example, using a washer having a surface that matches the outer peripheral curvature of the column, sealing with a hexagonal bolt, bolt, or nut is preferable because the contact surface between the column and the closing member can be increased and it can be firmly closed. The state after closing the pillar second opening 10 is shown by a broken line in FIG.

  Furthermore, the steel pipe brace is reinforced. This reinforcement is performed by filling the inside of the long brace with mortar at a position where the long brace and the short brace intersect (around the point shown by E in FIG. 2 and the periphery thereof).

  Therefore, as shown in FIG. 8, long brace openings 19 for injecting and filling mortar inside the long braces are provided in each of the existing long braces 3.

  The long brace opening 19 is provided above the position where the mortar (and the filling described later) is filled (for example, within about 1 m in the vertical direction from the upper end 20 to the top of the mortar filling range shown in FIG. 10) .

  The filling is first injected from the long brace opening 19. This filling is for filling the mortar so that the mortar is placed inside the long brace and at a position where the long brace and the short brace intersect (around the point shown by E in FIG. 2 and appropriately therearound) It is The details of the packing to be filled here are the same as those for the packing to be packed into the above-mentioned columns.

  The state after filling the filling 21 in the long brace 3 is shown by FIG. The filling of the long brace is done from the bottom of the brace so that the mortar will be filled in place as described below. The mortar to be filled in the long braces needs to be filled in the area 22 covering at least a portion where the long braces 3 and the short braces 4a and 4b intersect (around the point indicated by E in FIG. 2) In order to effectively reinforce the strength, it is preferable to fill the region 22 to an appropriately wider range (both the upper end 23 and the lower end 24 of the range 22). Therefore, it is preferable to fill the filling 21 so that the lower end 25 (see FIG. 10) of the mortar is located slightly below the lower end 24 of the range 22.

  After filling the filling 21, mortar is injected from the long brace opening 19 toward the top of the filling 21, and a position where the long brace 3 and the short braces 4a and 4b intersect (a point shown by E in FIG. 2) Fill the mortar 26 around and, if appropriate, the area). This mortar solidifies over time and adheres to the inside of the long brace 3. This reinforces the mortar filling point.

  As described above, the mortar 26 needs to be filled in a range 22 (see FIG. 9) covering at least a portion where the long brace 3 and the short braces 4a and 4b intersect (around the point shown by E in FIG. 2). However, in consideration of effectively reinforcing the strength, it is preferable to fill the region 22 to an appropriately wider range (both the upper end 23 and the lower end 24 of the range 22). FIG. 10 shows a state after the long brace 3 is filled with the mortar 26.

  After mortar filling, the long brace opening 19 provided in each long brace is closed. In FIG. 11, a state in which the long brace opening 19 is closed is shown by a broken line. The closing in this case can also be performed using a screw plug or the like. Further, for example, using a washer having a surface that matches the outer peripheral curvature of the column, sealing with a hexagonal bolt, bolt, or nut is preferable because the contact surface between the column and the closing member can be increased and it can be firmly closed.

  FIG. 11 illustrates the completion of the reinforcement according to the method of the present invention. All the columns and steel tube braces of the existing spherical tank to be reinforced are in the state as illustrated.

(Comparative experiment)
Brace intersection, and every how much reduced each part of the generated stress is by filling the mortar strut brace joint (connection portion), and model 3000 m ³ spherical tank, Case 1 (mortar unfilled), Case In two cases of 2 (mortar partial filling), “Contracted by the Ministry of Economy, Trade and Industry 2012 Oil Purification Industry Security Measures Project (Study on Earthquake and Tsunami Response at High Pressure Gas Handling Facility) (1) Examination on Earthquake at High Pressure Gas Equipment” (1) Examination of strength evaluation method of brace The average stress occurring in each part was calculated according to the method shown in the report (February, 2013, High Pressure Gas Safety Association).

The analysis conditions are as follows.
Applicable regulations: High Pressure Gas Safety Act Nominal capacity: 3000 m ³
Content filling rate: 90%
Upper support specification: φ 558.8 × 9.5 t (ACE 60H)
Lower support specification: φ 558.8 × 9.5 t (STK 41)
Brace specifications: φ 267.4 × 8.0 t (STK41)
Tank weight: 3,550 kN
Content of solution weight: 13,490.8 kN
Snow weight: 250 kN
Importance: Ia (β1 = 1.0)
Area classification: B (β2 = 0.6)
Ground type: Three types of ground (β3 = 2.0)
Tank center of gravity from bottom of base plate: 10,560 mm
Horizontal seismic force: 7,654.69 kN
Vertical seismic force: 20, 403.2 kN
Material Properties: See Table 1

  The mortar used was non-shrink mortar mixed with cement, water and sand, and the filling used was pearlite.

  In Case 2, mortar and filling were filled by the method of Example 1 of the present invention. The first support column opening, the second support column opening, and the long brace opening were each provided at a position 50 cm above the upper end of the mortar filling range, and closed after filling using a screw plug. In addition, the lower mortar of the column was filled up to a position of 50 mm upward from the upper end of the joint of the brace. The upper mortar of the column was filled from a position 50 mm downward from the lower end of the joint of the brace to a position 50 mm from the upper end of the joint to the top. The mortar of a long brace was filled from a position 50 mm downward from the lower end of the intersection with the short brace to a position 50 mm upward from the upper end of the intersection.

  The analysis target is shown in FIG. 12 and FIG.

Table 1 Physical Properties

  The analysis results (1) and (2) are as follows.

Table 2 shows the average stress and the stress reduction rate of each part. Further, FIG. 14 shows the average stress on the inner surface of the steel pipe where the stress becomes largest by comparing each part. Table 2 shows the average stress at the brace intersections between the struts No. 6 and No. 7 with the maximum axial force occurring at the braces, and between the struts No. 6 and No. 7 at the struts. The following findings were obtained for these.
(1) In Case 2 (mortar partial filling case), a stress reduction of up to about 70% is confirmed at the bracing intersection compared to Case 1 (mortar non-filling case).
(2) In Case 2, a stress reduction of up to about 65% is confirmed at the column-brace joint as compared with Case 1.
(3) From the above (1) and (2), it was confirmed that the generated stress can be reduced by filling the brace intersection and the strut / brace joint with mortar.

Table 2 Average stress and stress reduction rate of each part

(Example 2)
In the first embodiment, the column is provided with two openings (the column first opening and the column second opening) for injecting the mortar and the filling material into the column, but one such opening is You can also

  That is, from the position where the upper mortar 11 is filled around each of the columns 2 at the upper portion of the column where the long braces 3 and the short braces 4a and 4b are attached (locations indicated by C and D in FIG. 2) A pillar opening is provided on the upper side (for example, the position of the pillar second opening 10 in FIG. 5), and the pillar lower mortar (lower mortar) 6 and the filling 17 are provided on the inside of the pillar 2 from this one place. , And may be configured to be filled and filled with a mortar upper mortar (upper mortar) 11.

  In this case, there is a certain distance between the column opening and the position where the lower mortar 6 is filled, but if the mortar is dropped from a high position as it is, the components (mainly cement, water, bone) Material, which may affect the performance after hardening of the mortar, for example, when filling the lower mortar, insert the hose long inside the column from the column opening, and the tip of the hose Can be arranged near the lower mortar filling point and configured to inject the lower mortar through a hose.

  According to the method of the present invention, it is possible to perform reinforcement work without using fire and without temporarily reducing the existing strength. Therefore, reinforcement work such as earthquake resistance can be performed during operation of the existing spherical tank, and loss due to operation stop can be avoided.

  Further, according to the method of the present invention, since reinforcement work can be performed during tank operation, construction can be performed without being influenced by the tank opening time, which is compared with the case where operation is stopped and construction is performed during the opening period. And early reinforcement of earthquake resistance etc. can be done.

  Furthermore, in the method of the present invention, since it is not necessary to change the conditions such as the reservoir capacity, there is no operating restriction as in the case of the liquid level reduction measure.

  Not only that, the method of the present invention crosses steel tube braces (long braces which are long steel tube braces and short braces which is short steel tube braces) in which high stress is generated in existing spherical tanks having steel tube braces. Reinforcement is focused on the connection between the section and the column and the steel tube brace. Also, the construction does not require complicated processes or large-scale equipment / equipment. Therefore, according to the method of the present invention, the reinforcement can be efficiently and effectively performed, and the construction cost can also be suppressed.

  Thus, the industrial applicability of the present invention is extremely high.

1 existing spherical tank 2 support 3 long brace 4a, 4b short brace 5 support first opening 6 mortar for lower part (lower mortar)
7 Upper end 8 of lower mortar filling range Bottom end 9 of innermost column 2 of pillar 2 Upper end 10 of a portion where long brace 3 and short brace 4b are joined to support 2 of second pillar 11 opening upper pillar 12 upper mortar 12 of filling range of upper mortar 11 The upper end 13 of the column 2 covers the part where the upper end of the long brace 3 and the short brace 4 a is joined. The upper end 15 of the range 13 The lower end 16 of the range 13 The lower end 17 of the filling range of the upper mortar 17 The range 19 from the inner lowermost end 8 to the upper end 9 of the part where the long brace 3 and the short brace 4b are joined to the support 2 19 long brace opening 20 the upper end 21 of the mortar filling range of the long brace 21 filling 22 long The range 23 covering the intersection of the brace 3 and the short braces 4a and 4b The upper end 24 of the range 22 The lower end 25 of the range 22 The lower end of the mortar 26 Mortar A, B, C, D Joint between E-pillar and steel tube brace (long brace or short brace) E Crossing between steel tube braces (long brace and short brace)

Claims (1)

A reinforcement method of an existing spherical tank, in which a long brace which is a long steel pipe brace and a short brace which is a short steel pipe brace cross each other and attached to a column supporting the tank,
(A) providing a support post first opening for filling and filling a lower support mortar (lower mortar) inside the lower end of the support;
(B) filling the lower mortar from the pillar first opening, filling the lower mortar at a lower inner side of the pillar and at a position where the long brace or the short brace is attached;
(C) closing the support post first opening;
(D) providing each pillar with a pillar second opening for injecting and filling the pillar upper mortar (upper mortar) and the filling into the upper inside of the pillar;
(E) The filling material is placed on the lower mortar from the second pillar opening so that the upper mortar is disposed at the upper inner side of the column and at the position where the long brace or the short brace is attached. A step of injecting
(F) pouring an upper mortar onto the filling from the pillar second opening, and filling the upper mortar at the position described in (e);
(G) closing the support post second opening;
(H) providing an elongated brace opening in each elongated brace for injecting and filling a filling and mortar inside each elongated brace;
(I) Filling the lower inside of the long brace from the long brace opening so that the mortar is disposed at the inner side of the long brace and at which the long brace and the short brace intersect Injecting a substance,
(J) injecting a mortar from the long brace opening onto the filling, and filling the mortar at the position described in (i);
(K) closing the long brace opening;
And a method of reinforcing an existing spherical tank.

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