JPS61232193A - Built-up type sludge concentrating storage tank and execution method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application J) The present invention relates to a sludge concentration storage tank suitably used in small-scale sewage treatment facilities, etc., and a method for constructing the same.

[Prior Art] In water treatment facilities, a sludge HIM storage tank is installed as equipment for further concentrating sludge produced in a settling tank. This type of sludge concentration storage tank has a box-shaped structure including a bottom plate, a peripheral wall formed continuously on the bottom plate, and a top wall provided at the upper end of the peripheral wall. Conventional sludge thickening and storage tanks are generally constructed using so-called cast-in-place concrete.

1. Problems to be Solved by the Invention] However, in order to construct such a sludge concentration storage tank using cast-in-place concrete, large-scale form work and reinforcing work on site are indispensable, which makes the work complicated. Therefore, there are problems in that it is difficult to shorten the production time and reduce costs, and there are certain limits to quality control.

The present invention has been made with the aim of solving these problems, and includes a prefabricated sludge concentration and storage tank that can guarantee high quality and reduce complicated work on site. Furthermore, it is an object of the present invention to provide a construction method that allows the tank to be assembled without causing inconvenience in transportation or deterioration in the strength of the surrounding wall.

[Means for Solving the Problems] In order to achieve the above object, the first invention provides a sludge C tin storage tank with a precast concrete block acid bottom plate, and a precast concrete block acid base plate mounted in multiple stages on the bottom plate. An assembly comprising a concrete block acid peripheral wall, a precast concrete block acid stone slab capped on the L-end opening of the peripheral wall, and connecting means for respectively connecting the bottom slab, the peripheral wall, and the stone slab. It is characterized by being made into a formula.

In addition, the second invention is that when constructing such a sludge reduction storage tank, first, a precast concrete block acid bottom slab is laid, and a pair of mouth-shaped concrete blocks are joined to the housing shape on this bottom slab. A plurality of sets of surrounding walls formed by the method were arranged in a row in different mating directions so that the joints did not match, and stone slabs of precast concrete block acid were placed on the ends of the surrounding walls. It is characterized by

[Function J] With this type of sludge concentration storage tank, it is only necessary to assemble the bottom plate, surrounding wall body, and stone slab that have been manufactured in advance at a factory, etc. on site, so there is no need for complicated formwork or reinforcing bars on site. 1
Millet can be omitted.

A finished product can be obtained easily and quickly. This apparatus can correspond to various processing capacity specifications by appropriately selecting the number of stacked stages of the peripheral wall body.

In addition, according to the construction method of the sludge thickening and storage tank as described above, the peripheral wall, which tends to be especially bulky, can be divided into two parts, that is, it can be delivered to the site in the form of a mouth-shaped concrete block. , transportation can be facilitated. Moreover, since the peripheral walls formed by joining the mouth-shaped concrete blocks into a housing shape are arranged in a row in alternating directions so that the joined parts do not match, the wall adjacent to the upper wall The bodies will mutually reinforce the joints of the mouth-shaped concrete blocks. Therefore, it is possible to effectively suppress the disadvantage that the strength of each peripheral wall body is reduced due to the two-part structure.

Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 14.

FIG. 1 is a schematic plan view showing a prefabricated sludge concentration storage tank according to the present invention, and FIG.
The figure is a perspective view of the same. As shown in these drawings,
This sludge concentration storage tank consists of a bottom plate A made of precast concrete block acid, and a peripheral wall B1 made of precast concrete block acid installed in multiple stages on this bottom plate A.
~B3, and a stone slab C provided with a lid on the upper end opening of the peripheral wall bodies B1-B5.

As shown in Fig. 4, the bottom plate A is made by joining a pair of flat concrete blocks 1 and 2 made of reinforced concrete, and the two plates are joined using high-tensile port. This is done using 3.

To be more specific, metal connecting fittings 4 are embedded in the joint ends of each of the flat concrete blocks 1 and 2.

As shown in FIG. 5, the connecting fitting 4 includes a thick plate-like base plate part 5 and a thin plate-like cover part 6 connected to the base plate part 5. An anchor and a strut 7 are fixed to the base plate portion 5. The connecting fitting 4 has the base plate portion 5 exposed on the joint end surfaces 1a, 2a of the flat concrete blocks 1.2, and an opening on the upper surface of the concrete blocks 1.2. It is buried. The base plate portion 5 includes:
A bolt hole 8 is drilled, and a high tensile strength bolt 3 inserted through the bolt hole 8 connects the two plate-shaped concrete blocks 1.2. After fixing the bolts, the connecting fittings 4 are filled with mortar (not shown).

On the other hand, the surrounding walls B1 to B3 are made of paired U-shaped concrete blocks 9. as shown in FIGS. 6 to 8. It is formed by joining lO into a housing shape. The U-shaped concrete blocks 9 and 10 have a prestressed concrete structure in which reinforcing bars and PC steel bars 12 (not shown) are installed inside, and the two U-shaped concrete blocks 9 and 10 are joined together as shown in FIG. , PC steel bar 13°14
It is done using. That is, with both U-shaped concrete blocks 9 and 10 brought together, the PC steel rod 13 inserted into one block 9 and the PC steel rod 14 inserted into the other block 10 are connected via the coupler 15. The jQ blocks 9, 10 are tightly connected by fixing the nuts 16 to the PC steel bars 14 while applying tension to the PC steel bars 13, 14.

FIG. 9 is an enlarged sectional view showing the joined portion of both blocks 9 and 10, in which 17 is a sealing material made of water-expandable rubber, and 18 is a polyurethane resin joint.

19 is mortar, and stone slab C is a pair of flat concrete blocks 21 and 22 made of reinforced concrete, as shown in FIG.
The two plate-shaped concrete blocks 21 and 22 are joined together using high-tensile bolts 3, similar to the bottom plate A described above.

Then, the bottom plate A and the lowermost peripheral wall body B1 are connected by the first connecting means 23, and the peripheral wall body Bl-B
The three members are tightly connected using a second connecting member 24, and the uppermost peripheral wall body B3 and the stone slab C are connected by a connecting means 25 of i3. The first connecting means 23
As shown in FIG. 0 and FIG. 11, a pair of insert nuts 27 and 28 are buried adjacent to each other in the outer periphery of the bottom plate A and the lower end outer periphery of the peripheral wall Bl. A connecting iron plate 29 is attached to the opening end surface of .28, and the poles 31 and 32 passed through this connecting portion &29 are attached to both the above-mentioned Innocert nuts) 27.28.
It is designed to be screwed onto. As shown in FIG. 3, this connecting means 23 is provided in plural sets at required intervals in the lateral direction. Further, the second connecting means 24 is connected to each of the peripheral wall bodies Bl to B3, as shown in FIGS. 3 and 6.
A connecting box 33 is buried in an open state on the inner surface of the four corners of the connecting box 33, and upper and lower end surfaces 34 of the connecting box 33 and the peripheral wall Bl-B) are buried within the wall thickness of the four corners of each of the peripheral walls B1 to B3. , 35 is provided, and the lower end screw portion 38 of the vertically tightened PC steel rod 37 inserted into the insertion hole 36 is positioned within the connection box 33 of the lower peripheral wall body B1 or B2. At the same time, the upper end screw portion 39 is located within the connection box 33 of the upper peripheral wall body B2 or B3, and each of the screw portions 38.

By fixing a nut 41 to 39, the vertically adjacent peripheral wall bodies Bl and B2 and B2 and B3 are respectively connected. Furthermore, the third connecting means 2
5, as shown in FIG. 3, recesses 42 are provided in the four corner surfaces of the stone slab C, and each of these recesses 42 and the insertion hole 36 of the peripheral wall body B3'f) are communicated via a through hole 43. Then, the lower end threaded portion 45 of the vertically striped PC steel rod 44 inserted into the insertion hole 36 and the through hole 43 is positioned within the connection poke 33 of the uppermost peripheral wall member B3, and the end threaded portion 46 are made to protrude into the recess 42, and a nut 47 is fixed to both threaded portions 45 and 46. The connecting box 33 and the recess 42 are also filled with mortar (not shown) after the nuts are fixed.

In addition, FIG. 12 shows the joint part a of the flat concrete blocks l and 2 that constitute the bottom slab A, the joint part e of the flat concrete blocks 21 and 22 that constitute the stone slab C, and the bottom slab A.
48, 49, 50.51 in the figure. , 5
2 is a water-expandable rubber sealing material, 54.55.56.57
58.59.60 is a polyurethane resin joint, and 58.59.60 is a mortar joint. Further, 62 is a sloped floor made of cast-in-place concrete provided on the bottom slab A, 63 is an opening hole drilled in the stone slab C for mounting a manhole cover, and 64 and 65 are openings for piping.

Next, a method of constructing this sludge concentration storage tank will be explained. First, precast flat concrete blocks 1, 2.21° 22 and U-shaped concrete blocks 9, 1O manufactured at a factory or the like are transported to the site. At the site, we first excavated the ground @70 and laid foundation stone 71 at the bottom.
and pour foundation concrete 72. Then, a mortar 73 is laid on the foundation concrete 72, and the bottom slab A is laid in a predetermined position. As mentioned above, the bottom plate A is divided into two parts into a pair of flat concrete blocks 1 and 2, so these blocks 1 and 2 are joined at predetermined positions with high-tensile ports 3. The zero circumferential wall B1 that hems the eye circumferential wall B+ on the bottom plate A is also divided into two into a pair of U-shaped concrete blocks 9 and 10, so first, both the U-shaped concrete blocks 9 and 1 are separated.
0 is combined with the bottom plate Alz in a housing shape. Then, at the joint between the two blocks 9 and 10, the PC steel rods 13 and 14 in both blocks are connected by a coupler 15,
The connected PC steel rods 13 and 14 are tensioned with a predetermined tension using a hydraulic jack or the like, and the nuts are fixed. After that, the bottom plate A and this surrounding wall body Bl are attached to the port 31.3.
Next, the second-stage peripheral wall body B2 connected by 2 is assembled in the same manner as the peripheral wall body B1. Thereafter, the first-stage peripheral wall body Bl and the second-stage peripheral wall body B2 are tied together with a predetermined tension using vertically tightened PC steel rods 37. That is, as shown in FIG. 13, the lower end threaded part 38 and the upper end threaded part 39 of the longitudinally tightened PC steel rod 37 inserted into the insertion holes 36 of the inner peripheral walls Bl and B2 are connected to the respective peripheral walls 81 and B2.
2, and a bolt 41 is temporarily screwed into the lower end threaded portion 38 and the top end threaded portion 39 via an anchor plate 40, respectively. After that.

The tension rod 74 inserted into the insertion hole 36 from the upper end side of the second-stage peripheral wall body B2 and the upper end screw portion 39 of the vertically tightened PC steel rod 37
are connected via a connector 75.

Then, this tension rod 74 is pulled upward by a predetermined force set in advance by a hydraulic jack 76, and in this state, the nut 41 screwed into the upper end screw portion 39 is tightened using a wrench or the like. After that, this tension rod 74 and the connector 75 are removed, and the third stage surrounding wall body B is placed on this surrounding wall body B2.
3 to a2!1.

The third stage surrounding wall body B3 is also assembled in the same procedure as the second stage surrounding wall body B2, and the 0
After assembling the peripheral wall body B1-83, the stone slab C is set in the upper end opening of the uppermost peripheral wall body B3. The stone slab C is also divided into two parts into a pair of flat concrete blocks 21 and 22, so these blocks 21 and 22 are joined at a predetermined position with a high-tensile port 3. Next, the stone slab C is penetrated. A vertically tightened PC steel rod 44 is inserted from the hole 43 into the insertion hole 36 of the peripheral wall body B3, and is inserted into the lower end screw portion 45 of the PC steel rod 44 via the anchor plate 40 in the connection box 33 of the peripheral wall body B3. While screwing the nut 47, the PC steel rod 44 is inserted into the recess 42 of the stone slab C.
A nut 47 is screwed into the upper end threaded portion 46 of the bolt through the anchor plate 40. Then, this nut 47 is tightened with a wrench or the like to fix the stone slab C on the peripheral wall body B3.

As shown in FIG. 14, the peripheral walls 81 to B3 are connected in such a way that the directions of the U-shaped concrete blocks 9 and 10 are alternately different from each other by 90 degrees so that the joint parts s, c, and d do not match. I am trying to set it up. In this example,
Further, the bottom plate A and the peripheral wall B1 are connected in different directions by 90 degrees so that the joint part a of the bottom plate A and the joint part of the lowermost peripheral wall Bl do not coincide with each other. , the joint part e of the stone slab C and the uppermost peripheral wall body B
The stone slab C and the circumferential wall body B3 are arranged consecutively in different directions by 900 degrees so that the connecting portions d of No. 3 do not coincide with each other.

With this kind of configuration, a completed product can be obtained by combining the bottom plate A, the dispersion surrounding walls B1 to B3, and the stone slab C on site, so there is no need for large-scale formwork work on site. This eliminates the need for one piece of reinforcing steel, greatly reducing the complexity of on-site work. In addition, since the bottom plate A, the plurality of peripheral wall bodies B1 to B3, and the stone plate C can be manufactured by mass production methods in factories, etc., it is possible to perform sufficient quality control, and the one-dimensional accuracy is high and the cost is low. It is possible to provide a sludge thickening storage tank that can be easily installed in a town. Furthermore, by appropriately changing the number of stages of the surrounding wall bodies B1 to B3, various capacities of the tank 6 can be selected, and various capacities can be selected without changing the design or remanufacturing the formwork, etc. There is the convenience of being able to obtain a sludge thickening storage tank.

Moreover, according to the construction method of the sludge am storage tank as described above, the peripheral walls 81 to B3, which tend to be particularly bulky, are divided into two parts, that is, in the state of U-shaped concrete blocks 9.10, when they are delivered to the site. The surrounding wall body BI"B3 made by joining the U-shaped concrete blocks 9 and 10 into a housing shape can be carried in, making it easy to transport.
Alternately 90 degrees so that the joint parts S, C, and D do not match.
'Since we are installing them consecutively with different directions,
The vertically adjacent surrounding wall bodies B1 to B83 mutually reinforce the joint parts S, c, and d of the U-shaped concrete blocks, 9, and 1O. Therefore, each peripheral wall body B1 to B
It is possible to effectively suppress the inconvenience that the strength decreases due to the use of the two-part structure.

The number of stacked peripheral wall bodies is of course not limited to the one shown in the illustrated example, and can be changed as appropriate depending on the six tank acids required.

Further, the connecting means for connecting the bottom plate, the peripheral wall body, and the stone slab are not limited to those of the above-mentioned embodiments, and various modifications may be made without departing from the spirit of the present invention.

Furthermore, it goes without saying that the U-shaped concrete block referred to in the second invention is not limited to that of the embodiment described above, and for example, as shown in FIG. The U-shaped concrete block 82 may have a length different from that of the U-shaped concrete block 82.
In the case of No. 3, for example, the odd-numbered rows can be joined as shown in FIG. 16(a), and the even-numbered rows can be joined as shown in FIG. 16(b), so that they can be stacked one after another.

[Effects of the invention] As detailed above, the sludge Ie′I according to the first invention
The bottom plate, peripheral wall, and stone slab of the M storage tank are each made of precast concrete blocks, which eliminates the complexity of on-site work.
It is possible to shorten the period and reduce costs. In addition, since the surrounding wall is constituted by a plurality of surrounding wall bodies, it is possible to easily manufacture tanks with various capacities by appropriately selecting the number of stages in which the surrounding wall bodies are stacked. .

Furthermore, according to the construction method according to the second invention, at least the surrounding wall body can be delivered to the site after being divided into two pairs of U-shaped concrete blocks, which makes it difficult to transport because it is precast. Malfunctions can be effectively prevented. Moreover, is the peripheral wall body crossed so that the joint parts thereof do not match? Since they are arranged consecutively with different directions in the r direction, the vertically adjacent peripheral walls mutually reinforce the joints of the U-shaped concrete blocks. Therefore, a high-strength sludge am storage tank can be constructed without causing the inconvenience that the strength of each peripheral wall body is reduced due to the two-part structure.

[Brief explanation of the drawing]

1 to 14 show an embodiment of the present invention, in which FIG. 1 is a schematic plan view, FIG. 2 is a front sectional view, FIG. 3 is a partially cutaway perspective view, and FIG. 5 is a schematic plan view showing the bottom plate, FIG. 5 is an enlarged balance view showing the joint part of the bottom plate, FIG. 6 is a partially omitted balance view showing the peripheral wall, and FIG. 7 is the same. Figure 8 is a side view, Figure 8 is a front view, Figure 9 is an enlarged plan cross-sectional view of the joint between the U-shaped concrete blocks, and Figure 10 is an enlarged front view of the joint between the bottom slab and the surrounding wall. , 1st
FIG. 1 is a sectional view of the same side, and FIG. 12 is a sectional view showing the joint portion of the bottom plate 1 peripheral wall and the stone slab. FIG. 13 is an explanatory diagram for explaining a method of connecting peripheral wall bodies, and FIG. 14 is an explanatory diagram for explaining a construction method. FIG. 15 and FIGS. 16a and 16b are explanatory diagrams for explaining other embodiments of the present invention. A... Bottom plate B1-B3 - Fist/peripheral wall C... Fist stone slab l, 2... Flat concrete block la, 2a fist... Joint end surface 3Φ... High tension port 4... Connecting metal fittings 5.・・Base plate part 6・・Part of fist cover 7111111 Anchor muscle 8・・
・Porto hole 9.1O11elI U-shaped concrete block 12・
- PC steel rod 13.14... -PC steel bar 15... Coupler 16... Nut 17... Sealing material 18... Polyurethane resin joint 19... Mortar 21, 22Φ... Flat plate concrete Block 23...
- First connecting means 24...Second connecting means 25, Φ, Third connecting means 27, 28...Insert nut 29...II connecting iron plate 31, 32...Port 33...Strong connection Box 34...Top end surface 35...Top end surface 36...Through hole 37...-Vertically tightened PC steel bar 38...Lower end threaded portion 39...Top end threaded portion 40--Anchor plate 41 ... Nut 42 ... Recess 43 ... Through hole 44 ... Vertical tightening PC steel rod 45 ...
・Lower end screw portion 46...Upper end screw portion 471・Nuts 48 to 52...Seal material 54 to 57...Polyurethane resin joints 58, 59, 6
0...-Mortar 62...Slanted floor 63...Opening holes 64, 65...
・Piping opening A0...Ground @71...Foundation chestnut stone 72...
Foundation concrete 7311... Mortar 74... Tension rod 75... Series of knots 76, fists, hydraulic jacks 81, 82... Joint wall

Claims (2)

[Claims] (1) A bottom plate made of precast concrete block,
A peripheral wall body made of precast concrete blocks placed in multiple stages on this bottom slab, and a top slab made of precast concrete blocks with a lid attached to the upper end opening of this peripheral wall body,
A prefabricated sludge thickening and storage tank characterized by comprising connecting means for respectively connecting the bottom plate, the peripheral wall body, and the top plate. (2) A bottom slab made of precast concrete blocks is laid, and on this bottom slab, multiple sets of surrounding walls are formed by joining pairs of U-shaped concrete blocks in a housing shape, making sure that the joints do not match. A construction method for a prefabricated sludge thickening and storage tank, characterized in that the tanks are arranged in series in alternating directions in different directions, and a top plate made of precast concrete blocks is installed as a lid on the upper end of the surrounding wall body.