JPH0633712B2 - Cylindrical prefabricated tank and construction method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cylindrical prefabricated tank such as a cylindrical sewage treatment tank in a sewage treatment facility provided for treating sewage, and a method for constructing the same. .

[Prior Art and Problems to be Solved by the Invention]

Conventionally, when constructing this type of sewage treatment tank, the entire sewage treatment tank is constructed on-site, and the overall construction work such as mold assembly, installation and demolding is complicated and construction efficiency is poor and construction can be done easily. However, there was a problem that the construction period was long and expensive.

Therefore, a sewage treatment tank that is easy to construct and inexpensive is desired.

This invention was developed in view of the above-mentioned circumstances, and its purpose is to make a cylindrical pull hub tank to be a sewage treatment tank easily and inexpensively in a short time by a simple assembling work, and yet to be a strong cylinder. A prefabricated tank and a method for constructing the same.

[Means for solving problems]

This invention is (1) connecting elongated slender prefabricated blocks to each other in a generatrix direction in which a cylindrical tank in which annular protrusions are integrally formed on the outer periphery of the upper and lower ends of the tank is divided into a plurality of directions in the generatrix direction. A cylindrical prefabricated tank constructed on a foundation, in which upper and lower ends of each prefabricated block are internally formed with through holes that communicate with each other in the circumferential direction, and the PC is inserted into the through holes and is tensioned.
Adjacent prefabricated blocks are joined to each other by a steel material to form a cylindrical tank, and prestressed by a plurality of PC steel materials wound up and down along the outer peripheral surface between the protrusions at the upper and lower ends of the cylindrical tank. (2) The cylindrical prefabricated blocks are connected to each other in the direction of the generatrix and are connected to each other on the foundation. A cylindrical prefabricated tank comprising a concentric cylindrical outer wall and an inner wall formed, the outer wall forming an annular protruding portion on the outer periphery of the upper end and the lower end of each prefabricated block,
In addition, a through hole that communicates in the circumferential direction is formed inside, and adjacent prefabricated blocks are joined to each other by a PC steel material that is inserted into the through hole and is strained to form a cylindrical tank, and the upper and lower ends of the cylindrical tank project. Prestressed by a plurality of PC steel materials wound at an interval vertically along the outer peripheral surface between the parts to be integrally joined, and the inner wall is provided with a plurality of connecting fittings and bolts at the joint end of each prefabricated block. It is characterized by being assembled into a cylindrical tank by connecting and joining from the inner and outer parts with a nut, and (3) a cylindrical tank with an annular protrusion integrally formed on the outer circumference of the upper and lower ends of the tank. A method for constructing a prefabricated tank by connecting elongated prefabricated blocks in a generatrix direction of a shape in which the tank is divided into a plurality of parts in a busbar direction, in a cylindrical shape on a foundation,
Each prefabricated block has a cylindrical steel tank in which PC steel material is inserted into through holes formed in the upper and lower ends of the prefabricated block in the circumferential direction and adjacent prefabricated blocks are sequentially joined by tensioning the PC steel material. Is constructed, and a plurality of PC steel materials are wound around the outer peripheral surface between the protrusions at the upper end and the lower end of the cylindrical tank at upper and lower intervals, and these are tensioned to prestress the cylindrical tank. By joining the prefabricated blocks together, (4) a Prague tank block elongated in the generatrix direction of a cylindrical tank divided into a plurality of lines in the generatrix direction is concentric with each other on the foundation. A method of constructing a prefabricated tank which is connected to form an outer wall and an inner wall, wherein annular preforms integrally formed at the upper end and the lower end of each prefabricated block communicate with each other in the circumferential direction. PC steel material is inserted into the through hole, and adjacent prefabricated blocks are sequentially joined by tensioning the PC steel material to construct a cylindrical tank serving as an outer wall, and between the upper and lower protruding portions of the cylindrical tank. A plurality of PC steel materials are wound around the outer peripheral surface of the PC at upper and lower intervals and tensioned to apply prestress to the cylindrical tank, prefabricated blocks are integrally joined, and adjacent prefabricated blocks are joined together. By inserting a bolt into a connecting fitting arranged at an end and fastening the nut from the inner and outer parts by a nut to construct a cylindrical prefabricated tank which becomes an inner wall by sequentially assembling in a cylindrical shape, the above-mentioned problem Is to solve.

〔Example〕

 The present invention will be described below with reference to illustrated embodiments.

This embodiment is intended for a circular-centered cylindrical sewage treatment tank. The first and third inventions relate to a cylindrical tank as an outer wall and a method for constructing the same, and the second and fourth inventions are The present invention relates to a treatment tank in which a circular cylindrical tank is provided on an inner wall with the cylindrical tank of the first invention or the third invention as an outer wall, and a construction method thereof.

The concentric cylindrical sewage treatment tank 1, which is a cylindrical prefabricated tank, has an inner settling tank portion 3 surrounded by a cylindrical inner wall 2 formed in the central portion, and a cylindrical shape formed on the outer circumference of the inner settling tank portion 3. The outer aeration tank portion 5 is surrounded by the outer wall 4.

Each of the inner wall 2 and the outer wall 4 has a cylindrical inner wall prefabricated block 2a and outer wall prefabricated blocks 4a, 4a ', 4a "which are elongated in the generatrix direction of a shape obtained by dividing the cylindrical tank into a plurality of cylindrical shapes. Further, the prefabricated block for outer wall is integrally formed with an annular projecting portion outside the upper and lower ends thereof (see FIGS. 1 and 2). At the time of construction, a plurality of outer wall prefabricated blocks 4a, 4a are connected to each other in the circumferential direction at the upper and lower portions of the respective blocks, and the PC steel material 6 is inserted into the through holes 4c formed in the inside to tightly connect them. Then, the outer wall 4 is formed by assembling it in a cylindrical shape on the rubble stones and the waste concrete, and prestressing them in the circumferential direction to integrally join them.

The tension connection by the PC steel material 6 uses the connecting metal fittings 4b provided in the opening opening to the outer surface at the upper and lower portions in the circumferential center of the prefabricated block 4a for outer wall, and from one side of the block 4b to the through hole 4c. After inserting the PC steel material 6 into the block, one end of the PC steel material is fixed with a nut on one side of the connecting metal fitting, and the other end portion of the block 4a is adjacent to the block 4a.
Of the through hole 4 from one side of the adjacent block 4a.
The one end of the tension member inserted in c is connected to the coupler 21 by the coupler 21, and the PC steel material 6 is tensioned using the tension clamp 13 at the other end of the tension member to join the blocks 4a and 4a. The same operation is repeated thereafter. (See FIGS. 4, 12, and 13) Further, two PC steel materials are stored in the final prefabricated block 4a ″ for outer wall at the time of assembly to form the outer wall 4, and the prefabricated block 4a for outer wall to be connected is The PC steel material 6 is inserted into the through hole 4c and passed therethrough (see FIGS. 14 and 15), and the tightening and tightening of each PC steel material 6 uses the tightening and tightening tool 13 as shown in FIGS. Alternately done.

Furthermore, in order to apply prestress to the outer peripheral surface of the outer wall 4 and integrate them, two (3) PC steel materials 8 having a circumference length of about 1/2 (a circumference length of about 1/3 may be used) are used. , 1/2 (1/3) outer peripheral surface of the outer wall 4 is wound around the entire outer peripheral surface of the outer wall 4 to form a plurality of steps from the lower end of the outer wall 4, and the outer wall at the end contact position of these two (3) PC steel materials 8 Each PC steel material end is gripped and fixed to the fixing portion 9 formed on the prefabricated block 4a '. The grip fixing position is 90 ° (6
0 °) It is established differently. (Fig. 2 and 10
(See FIG. 11) Next, concrete for forming the bottom slab 11 is placed on the inner foundation 7 surrounded by the outer wall 4. At this time, the lower end of each outer wall prefabricated block 4a and the bottom plate 11 are connected by the anchor member 12. (See FIG. 3 and FIG. 5) Next, a plurality of inner wall prefabricated blocks 2a are used in the center portion of the bottom slab 11 by utilizing a groove 14 formed by a guide formwork 10 described later, and the bottom slab 11 and anchor bars 15 are formed. And preassembled into a circular shape by connecting with the prefabricated block 2
The inner wall 2 is formed by connecting and joining the inner and outer parts by the connecting fitting 16 and the bolts and nuts 17 arranged in a. (See FIGS. 19 and 20) Here, the groove 14 is formed by the guide form 10 as shown in FIG. 21 to which the anchor bar 15 is previously attached as a support when forming the bottom plate 11. Each inner wall prefabricated block 2a has a mounting work recess formed at the lower end of the inner wall prefabricated block 2a as shown in FIGS. 22 to 24 in the anchor bar 15 in the groove 14 after the guide formwork 10 is removed. It is attached by engaging a mounting member 19 provided so as to project into the inside 18.

Further, as shown in FIGS. 20 and 25, a plurality of connecting fittings 16 are alternately provided on the inner and outer portions of the inner wall prefab block 2a, and are exposed so as to be flush with the joint end surface. It is formed in a box shape having an opening on the front surface side having the tightening frates 16a.

Meanwhile, joint material is injected into the joint surface of each outer wall prefabricated block 4a and each outer wall prefabricated block 4a is also injected.
Of the inner wall of the prefabricated block 2a and the corners of the outer wall of the prefabricated block 4a and the bottom plate 11 are filled with a sealing material, and the inner wall of the prefabricated block 2a, the bottom plate 11 and the inner and outer corners of the mortar. Filled with processing tank 1
Construction work is completed. (See FIG. 26) As the bolts and nuts used in this embodiment, high tension bolts, stainless steel bolts and the like are used. For the anchor member and the anchor bar, iron-plated round steel, stainless round steel, etc. are used.

[Effects of the Invention] PC steel material is inserted through the through holes formed by connecting the prefabricated blocks obtained by dividing the cylindrical tank into a plurality of parts in the generatrix direction in the inner peripheral direction of each block, and the PC steel materials are tensioned and connected to each other. By constructing with an integrated joint by applying a prestress in the direction, the construction can be performed easily and efficiently, and a strong cylindrical prefabricated tank can be provided.

The cylindrical prefabricated tank described in the preceding paragraph is used as the outer wall to which water pressure is applied to the inner surface of the concentric cylindrical prefabricated tank and earth pressure is applied to the outer surface, and the inner wall to which pressure is applied to the inner and outer surfaces is a prefabricated block connecting fitting. Also, the concentric cylindrical prefabricated tank has a good balance between cost and strength because it is formed only by connecting and joining with bolts and nuts.

As described in the preceding paragraphs, the cylindrical prefabricated tank and the method for constructing the same of the present invention can provide a concentric cylindrical sewage treatment tank that is easy to construct, efficient, and strong.

Therefore, the treatment tank of the sewerage treatment facility can be economically constructed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a treatment tank constructed by the method of the present invention, FIG. 2 is a plan view, FIGS. 3 to 8 are process drawings showing a construction state of an outer wall, and FIG. FIG. 10 is an enlarged view of part A of the figure, FIG. 10 and FIG. 11 are cross-sectional views showing a tensioned state of PC steel material on the outer peripheral surface of the outer wall, and FIGS. 12 to 18 are steps showing a connection state of PC steel materials of each outer wall block. FIG. 19, FIG. 20, FIG. 22, and FIG. 22 are process drawings showing the construction state of the inner wall, and FIG.
FIG. 1 is a perspective view showing a guide formwork and an anchor bar for mounting and supporting the guide formwork, FIGS. 23 and 24 are enlarged views of portions B and C of FIG. 20, and FIG. 25 is D- of FIG. D
A line sectional view, FIG. 26 is a sectional view showing the treatment tank after completion of construction. 1 ... Concentric cylindrical sewage treatment tank, 2 ... inner wall, 2a ... inner wall block, 3 ... inner sedimentation tank part, 4 ... outer wall, 4
a, 4a ', 4a "... Outer wall block, 4b, 4b' ... Connecting metal fitting, 4c ... Through hole, 5 ... Outer aeration tank part, 6 ... PC steel material, 7 ... Kuriishi side-by-side connector, 8
…… PC steel, 9 …… Fixing part, 10 …… Guide form, 1
1 ... Bottom plate, 12 ... Anchor member, 13 ... Tension tightening tool, 14 ... Groove, 15 ... Anchor bar, 16 ... Connecting metal fitting, 16a ... Tightening plate, 17 ... Bolt / nut, 18 ...... Recess for mounting work, 19 ...... Mounting hardware, 20 ...... Tension material, 21 ...... Coupler.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Asahi Concrete Industry Co., Ltd. 1-2-8 Tsukiji, Chuo-ku, Tokyo (72) Inventor Ken Mori 2-13-13 Iwado Minami, Komae-shi, Tokyo ( 72) Inventor Katsuko Motomura 4-12-23 Toranomon, Minato-ku, Tokyo Tate No. 2 Building Within the Japan Sewerage Facility Association (72) Inventor Jiro Abe 2-51 Higashizui, Gifu City, Gifu Prefecture (72) Invention Akihiko Hosono 1-26 Hirai-cho, Kusatsu City, Shiga Prefecture (56) Reference JP-A-61-47380 (JP, A) JP-A-61-47381 (JP, A) JP-A-60-23593 (JP, A)

Claims (4)

[Claims] 1. A prefabricated block which is elongated in a generatrix direction and has a cylindrical shape in which annular projections are integrally formed on the outer circumferences of the upper and lower ends of the tank is divided into a plurality of parts in the generatrix direction. A cylindrical prefabricated tank constructed as described above, wherein through holes that communicate with each other in the circumferential direction are formed inside at the upper and lower ends of each prefabricated block, and adjacent prefabricated blocks are joined together by a PC steel material that is inserted into the through holes and is tensioned. A cylindrical tank is formed, and prestressed by a plurality of PC steel materials wound up and down along the outer peripheral surface between the upper and lower protrusions of the cylindrical tank and integrally joined. A cylindrical prefabricated tank characterized by having. 2. A cylinder comprising a concentric cylindrical outer wall and an inner wall, which are constructed on a foundation by connecting slender prefabricated blocks in the generatrix direction of a shape in which a cylindrical tank is divided into a plurality of parts in the generatrix direction. A prefabricated tank, the outer wall of which is integrally formed with annular projections on the outer periphery of the upper end and the lower end of each prefabricated block, and has a through hole communicating in the circumferential direction formed inside, and inserted into the through hole. Nervous P
Adjacent prefabricated blocks are joined to each other by C steel material to form a cylindrical tank, and a plurality of PC steel materials are wound along the outer peripheral surface between the protrusions at the upper and lower ends of the cylindrical tank at a vertical interval. It is stressed and integrally joined, and the inner wall is assembled into a cylindrical tank by connecting and joining from the inner and outer parts with connecting fittings and bolts and nuts arranged at the joint end of each prefabricated block. Cylindrical prefabricated tank. 3. A prefabricated block elongated in the generatrix direction, which is a cylindrical chamber having a plurality of annular projections integrally formed on the outer circumferences of the upper and lower ends of the tank and is divided into a plurality of lines in the generatrix direction. A method of constructing a prefabricated tank by connecting the prefabricated blocks to each other by inserting a PC steel material into through holes formed in the upper and lower ends of the prefabricated blocks in the circumferential direction. The steel materials are sequentially joined by tensioning to form a cylindrical tank, and a plurality of PC steel materials are wound at vertical intervals along the outer peripheral surface between the protrusions at the upper and lower ends of the cylindrical tank. A method for constructing a cylindrical prefabricated tank, characterized in that the prefabricated block is joined together by prestressing the cylindrical tank by prestressing it. 4. A method of constructing a prefabricated tank which is an outer wall and an inner wall by connecting prefabricated blocks elongated in the generatrix direction in a shape obtained by dividing the cylindrical tank into a plurality of lines in the generatrix direction on the basis of each other to form an outer wall and an inner wall. The PC steel material is inserted into the through holes that are formed in the respective upper and lower ends of each prefabricated block and that communicate with each other in the circumferential direction, and the adjacent prefabricated blocks are connected to the PC steel material. A cylindrical tank that serves as an outer wall is constructed by sequentially tensioning the two, and a plurality of PC steel materials are wound at vertical intervals along the outer peripheral surface between the protrusions at the upper and lower ends of the cylindrical tank. Twist it to apply prestress to the cylindrical tank, join the prefabricated blocks together, and insert the bolts into the connecting fittings at the joining ends of the adjacent prefabricated blocks to insert the nuts. In cylindrical prefabricated tank construction method of which is characterized by constructing a cylindrical tank to be assembled inside wall sequentially cylindrical concluded from inside and outside sides.