JPH087276B2 - How to build a lining tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a lining tank or a swimming pool used in a nuclear power plant or the like.

[0002]

2. Description of the Related Art In a nuclear power plant or the like, a tank having a lining plate lined inside is used to prevent liquid leakage and facilitate decontamination work. This lining tank is constructed. In this case, for example, a predetermined foundation 10 is constructed as shown in FIG. 5, and a support member 11 is previously prepared as shown in FIG.
The embedded metal fittings 12 to which are attached are arranged at predetermined positions from the pillars 13 made of H-shaped steel or the like on the side portions provided at appropriate intervals through the support members 14, and the inside and outside of the mold frame plywood are arranged. Along with that, the necessary reinforcement was done to fill the concrete. Then, after the concrete is solidified, the inner and outer plywood for formwork is removed, mortar is applied to the inside to adjust the flatness, and a slightly thicker lining plate 15 is attached to the inner surface to form the lining plates 15 and the corner pieces. Was welded at the joint. However, in the method for constructing a lining tank according to the conventional example shown above, since the embedded metal article 12 made of a backing metal or the like is installed in a space portion where nothing is present before concrete is poured,
There is a problem in that it is necessary to mount the column 13 made of H-shaped steel through the support member 14 and to set it, and it is extremely troublesome to install it accurately. In addition, since the inner surface immediately after placing the concrete is rough and has no flatness, it is necessary to trowel the mortar for flatness adjustment on the surface, which is a very troublesome task. It was Further, there is a problem that it is necessary to take a drying period for the mortar, which lengthens the construction period. So, conventionally,
For example, as described in Japanese Patent Laid-Open No. 48-33632, "Forming and Lining Construction Method", an embedding material is assembled as a steel frame structure, a lining plate is attached to the embedding material, and then a steel frame structure is formed. It is known that a mold is provided on the side opposite to the lining plate, and concrete is placed between the mold and the lining plate.

[0003]

However, in this conventional method, since the lining plate is attached to the steel frame structure as an embedding material assembled at the construction site, the construction period at the site is prolonged. There was fear. Moreover, since only the lining plate constitutes the liquid contact side frame of the form and receives the lateral pressure of the concrete to be filled directly, it is unavoidable to use a considerably thick and expensive lining plate according to the magnitude of this lateral pressure. It seems to be done.
Furthermore, the steel structure as an embedding material tends to be bulky when transported from the factory and must be repeatedly reciprocated with the site, or depending on the size, it is caught in the vehicle size limit of the Road Traffic Act. There was also the problem that it would end up.
The present invention has been made in view of such circumstances, the manufacturing cost is low, the transportability can be improved, the construction period at the site can be shortened, the lining plate can be thinned, and the mold on the liquid contact side can be further reduced. An object of the present invention is to provide a method for constructing a lining tank capable of improving frame strength.

[0004]

A method according to the above-mentioned object.
The method for constructing the lining tank described above includes a step of preliminarily manufacturing a concrete panel having a predetermined shape in which a lining plate is stretched on the surface in a factory, and the lining plate being the liquid-contacting side of the panel. Used as a frame, perform necessary bar arrangement on the outside of the liquid contact side frame, provide a facing frame and form a mold with the facing frame and the liquid contact side frame, and fill the mold with concrete. And a step of welding the joint portion of the lining plate, and further, the lining plate of the concrete panel is extended to the frame and backing plate arranged at the end of the other concrete panel. Was set up,
The welding of the joint portion of the lining plate to be joined is configured to be performed on the frame and backing metal. Here, the welding of the joint portion of the lining plate (for example, made of stainless steel or iron plate or other metal plate) is preferably performed after the filled concrete is solidified and dried, but the framework of the liquid contact side frame is The present invention also applies to the case where the processing is performed after the completion. In addition, the concrete panel is provided with a frame body in the periphery, a reinforcing wire mesh or a reinforcing bar is disposed inside, and a lightweight cellular concrete is used for the concrete. The present invention also applies.

[0005]

In the method for constructing a lining tank according to the first aspect of the present invention, since a concrete panel having a predetermined shape and having a lining plate on its surface is manufactured in a factory in advance, the lining plate and the concrete on the inner surface thereof are in close contact with each other. Therefore, since the concrete reinforces the lining plate on the surface, the thickness of the lining plate can be reduced, and since the lining plate is integrated with the concrete panel, the transportability is improved and the work of sticking the lining plate on site can be omitted. Therefore, the construction period can be shortened. Then, an embedded metal object such as a backing metal, which has been conventionally held in a space by a support member, can be embedded in the concrete panel. Further, since the back of the lining plate is in close contact with the concrete, there is no need for a mortar for adjusting the flatness as in the conventional case. Furthermore, when concrete is filled into the formwork, inside the formwork in the liquid contact side frame, there is a concrete wall of a certain thickness with adjacent parts connected as a solid wall. There is almost no risk of the mold being deformed or broken due to lateral pressure, which allows the lining plate arranged on the liquid contact side of the liquid contact side frame to be thinned to the minimum thickness that can withstand corrosion, reducing costs. Can be achieved. And
Since the frame body backing metal is placed at the joint part of the concrete panel, the concrete panel is reinforced, and when welding the lining plate, there is a frame body backing metal on the back side of the welded part. In addition, welding can be done reliably. If necessary, a leak detection groove can be formed in this joint portion by the backing metal that also serves as the frame body.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a side sectional view showing a construction state of a method for constructing a lining tank according to an embodiment of the present invention, FIG. 2 is a perspective view of a concrete panel, and FIG. 3 is a sectional view showing a joined state of the concrete panel. FIG. 4 is a cross-sectional view showing another construction example of the method of the present invention.

First, as shown in FIG. 2, a concrete panel 16 is to be manufactured in advance. First, a metal frame is used to make a frame / backing metal 17 of a predetermined size, and an appropriate reinforcing material is provided inside. After arranging the wire net etc., attach a relatively thin (for example, about 2 mm) lining plate 18 to the surface,
Depending on the case, an opening is provided in the lining plate 18 and an embedded metal fitting 21 is attached to the inside of the concrete 19 (see FIG.
See). The frame / backing metal 17 is provided with bolt holes 20 at a predetermined pitch, and the concrete around the portion where the bolt holes 20 are provided is notched as shown in FIG. 3 (A). , Bolts, nuts 20
a can be inserted. In this embodiment, the concrete panel 16 has a size of 300.
Although it was about 0 × 6000 × 65 mm, it can be appropriately selected according to the size of the lining tank to be manufactured.

A concrete panel 1 having a predetermined size
When making 6, the frame body and backing metal 17 may be provided and welded in the part which joins several lining boards 18. Further, it is possible to form a leak detection groove in the frame / backing metal 17 as required. It should be noted that the concrete panel 22 used at the lower part of the wall surface is provided with a corner portion 23 having an appropriate arc shape.

Next, a hole having a predetermined size is dug, and as shown in FIG. 1, a bar 25 is appropriately arranged inside, and the corner is placed on a base material (also called a packer) 26 having a predetermined height. Part 2
Mount a concrete panel 22 having 3. The concrete panel 22 is sandwiched between the reinforcing bars 25.
The plywood 27 for the formwork that constitutes the opposite frame is arranged so as to face the above, the separators 28 are arranged at a predetermined pitch, and the concrete panel 22 and the plywood 27 for the formwork form a formwork, and concrete is applied from the top. Fill. When the concrete panels 22 are set, they are appropriately fixed by using support members 29, and the adjacent concrete panels 22 use bolt holes 20 as shown in FIG. 3 (A). It is fixed by bolts and nuts 20a. In the above embodiments, the floor may be made of concrete panels.

After the concrete is filled to a proper position and solidified, the upper reinforcing bar 25 is further arranged, and another concrete panel 1 is placed on the concrete panel 22.
6 is mounted and fixedly connected by a bolt and a nut 20a using the bolt hole 20. In addition to such a joining method, as shown in FIG. 3B, the stoppers 31 and 32 having bolt holes provided at an appropriate pitch are attached to the frame / backing plate 17, and the stoppers 31 and 32 are attached. It is also possible to connect concrete panels vertically or adjacently by screwing 32 with bolts and nuts 32a.

After that, the second concrete is filled from the top, and the lining plate 18 is welded and joined after the concrete is solidified. Here, when the lining plate 18 stretched inward is made to coincide with the corners of the frame / backing metal 17, the joints of the frame / backing metal 17 in joining the concrete panels 16 and 22. And lining plate 18
Since the joint portion of the frame body and the backing metal 17 does not act as the backing metal, the lining plate 18 is joined to any of the adjacent frame body and the backing metal as shown in FIG. 3 (A). Money 17
On one side. In this way, since the backing metal 17 that also serves as a frame is arranged at the joint portion of the concrete panel, the concrete panel is reinforced, and also when the lining plate 18 is welded, the backing metal also serves as the frame. Since the backing plate 17 is provided, welding can be reliably performed. If necessary, the frame / backing metal 17 can be provided with a leak detection groove. After the above work is completed, the welded portion is polished as required, the formwork plywood 27 is removed to fill the gap between the hole and the cast concrete, and the lining tank is completed. As described above, since the concrete panels 16 and 22 having the lining plate 18 stretched on the surface are manufactured in advance in the factory, the line nig plate 18 and the concrete 19 on the inner surface thereof are in close contact with each other. Therefore, since the concrete 19 reinforces the lining plate 18 on the surface, the thickness of the lining plate 18 can be reduced, and since the lining plate 18 can be carried integrally with the concrete panels 16 and 22, the transportability is improved and the site is improved. The work of sticking the lining plate 18 at the step can be omitted, and the construction period can be shortened. Furthermore, when filling concrete into the formwork, in the liquid-contact side frame, there is a concrete wall of a certain thickness with adjacent walls connected to each other inside the formwork as a solid wall. There is almost no risk of the mold being deformed or broken due to the side pressure of the lining plate, which reduces the thickness of the lining plate arranged on the wetted side of the wetted side frame to the minimum thickness that can withstand corrosion, reducing costs. Can be planned.

Next, regarding the method of constructing a lining tank according to another embodiment shown in FIG. 4, the difference from the above embodiment will be described. A predetermined number of anchor bolts 34 are mounted on a foundation 33.
The frame 36 of the lower concrete panel 35 is inserted into the anchor bolt 34, fixed by a nut to determine the position, and a supporting member 37 is appropriately provided so as not to fall. In the concrete panels 35 and 38 used in this embodiment, the frame 36 is used.
A flat plate (flat bar) is used for the other frame bodies 39. In the above examples, the lining plate 1
The welding of No. 8 was performed after the concrete panel was filled with concrete, but it can also be performed in the process of assembling the concrete panel. Also,
When the wall of the lining tank is low, it is possible to build the entire formwork and then fill the entire concrete in one go. In addition, in the said Example, although the case where an underground pit was dug and a lining tank was built was demonstrated, this invention is applied also when constructing a lining tank on the ground or the semi-ground.

[0013]

As is apparent from the above description, the method for constructing a lining tank according to claim 1 uses a concrete panel having a lining plate stretched on the surface as a liquid contact side frame, so that the surface The inner lining plate and the inner concrete can be intimately contacted with each other, which makes it possible to use a relatively thin lining plate. Also,
Since the lining board is integrated with the concrete panel, the transportability can be improved, and the work of attaching the lining board on site can be omitted, and the construction period can be shortened. In addition, since the lining plate is preliminarily stretched on the concrete at the factory, it is not necessary to apply mortar for adjusting the flatness to the surface of the concrete as in the conventional case, and the manufacturing process is greatly simplified. Moreover, since the concrete panel is dried in advance, unlike the conventional method, it is possible to prevent adverse effects on welding due to water content in the mortar. The column made of H-section steel or the like used in the conventional method can be omitted. Then, an embedded metal object such as a backing metal, which has been conventionally held in a space by a support member, can be embedded in a concrete panel. Also, when concrete is filled into the formwork, inside the formwork in the liquid contact side frame, concrete panels of a certain thickness connected next to each other exist as a solid wall, so the side pressure from the filled concrete is There is almost no risk of the mold being deformed or broken due to
As a result, the lining plate arranged on the liquid contact side of the liquid contact side frame can be thinned to the minimum thickness that can withstand corrosion, and the cost can be reduced. In addition, since a backing plate that also serves as a frame is placed at the joint part of the concrete panel, the concrete panel can be reinforced, and when welding the lining plate, the backing that also serves as a frame can be applied to the back side of the welded part. The presence of gold ensures welding.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a construction situation of a method for constructing a lining tank according to an embodiment of the present invention.

FIG. 2 is a perspective view of a concrete panel.

FIG. 3 is a cross-sectional view showing a joined state of concrete panels.

FIG. 4 is a sectional view showing another construction example of the method of the present invention.

FIG. 5 is a cross-sectional view showing a method for constructing a lining tank according to a conventional example.

FIG. 6 is a perspective view of an embedded metal product used in a conventional method.

[Explanation of symbols]

 16 Concrete panel 17 Frame / backing metal 18 Lining plate 19 Concrete 20 Bolt hole 20a Bolt, nut 21 Embedded metal 22 Concrete panel 23 Corner part 25 Rebar 26 Base material 27 Formwork plywood (opposing frame) 28 Separator 29 Supporting member 31 Stopper 32 Stopper 33 Foundation 34 Anchor bolt 35 Concrete panel 36 Frame 37 Supporting member 38 Concrete panel 39 Frame

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G21F 9/22 ZAB

Claims (1)

[Claims] 1. A process of preliminarily manufacturing a concrete panel having a predetermined shape with a lining plate stretched on the surface in a factory,
The panel is used as a liquid contact side frame so that the lining plate is on the liquid contact side, and necessary reinforcement is provided on the outer side of the liquid contact side frame. Forming a mold with a liquid side frame, having a step of filling the mold with concrete, and a step of welding the joint portion of the lining plate, moreover, the lining plate of the concrete panel, the other of the The lining is characterized in that the welding of the joint portion of the lining plate which is extended to the frame-equipped backing metal arranged at the end of the concrete panel and is joined is performed on the frame-equipped backing metal. How to build a tank.