JPH0258517B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Fields> The present invention facilitates the removal of voids in construction work of nuclear power plants, thermal power plants, etc., especially the void portion between the concrete frame and pipes after piping work. This invention relates to a method for filling voids that can be filled economically.

<Prior Art> In construction work for nuclear power plants, thermal power plants, etc., in order to install plumbing pipes, many circular horizontal holes are formed in the concrete structure using formwork during concrete pouring. This horizontal hole is formed to be considerably larger than the diameter of the pipe, taking into account positional errors due to mechanical installation of the pipe, etc., so it is possible to avoid gaps that may occur between the outer circumferential surface of the pipe and the concrete structure after piping work. need to be blocked.

The volume of such voids varies widely depending on the shape of the pipe, etc., and the position from the floor surface also varies, so conventionally, all of these voids were made by hand by shaping hard mortar into a ball shape. The method used was to plug the gaps by inserting something with a stick and tamping it down.

<Problems to be solved by the invention> In the construction work described above, for example, if the concrete wall thickness is 100 cm and the pipe diameter is 80 cm, the diameter
A horizontal hole of about 120 cm is formed, and the gap after piping is about 0.63 m ³ , so in order to fill the gap using conventional construction methods, it would take four workers to prepare cement, sand, and water on site. It takes about half a day to mix the mortar, make the dango, and fill it. Furthermore, if the position of the horizontal hole requires work at heights that require scaffolding such as a ladder, the work efficiency will further decrease and the work time will increase.

Even if we try to mechanize this work, some parts have many holes and others have only 1 or 2 holes depending on the location, and the hole diameters vary from small to large, so it is currently done manually. They had no choice but to rely on the workers, and a huge number of workers were needed for this work. Incidentally, the number of horizontal holes in a single nuclear power plant is said to be 6,000 to 7,000, and considering that the wall thickness is 800 to 1,200 mm, which is extremely thick compared to general structures, it is difficult to fill the voids described above. It is expected that the work will be difficult.

In view of the above-mentioned problems, an object of the present invention is to provide a void-filling method that can significantly reduce the number of workers and working time when filling the above-mentioned voids or horizontal holes that do not require piping. shall be.

<Means for Solving the Problems> The structure of the void filling method according to the present invention that achieves the above-mentioned object is applicable to construction work for closing voids formed in concrete frames in civil engineering and building structures.
After inserting an insert made of cement mortar or a concrete block into the gap, a cover is formed by embedding ultra-fast hardening mortar or hard kneaded mortar into both open ends of the gap, and at the same time An air vent and a filling port are provided, or an air vent is provided on one side and a filling port is provided on the other, and an expandable cement slurry or a non-shrinkable grout slurry containing one or more types of expanding materials is prepared from the filling port. It is characterized by being filled with a filler.

Here, the above-mentioned lid may be one that comes into contact with the peripheral surface of the opening of the gap, or one that fits into the opening. In addition, in the case of a fitting lid, it can be left attached. Furthermore, this lid can also be formed by filling mortar into both openings of the gap after inserting the insertion material into the gap. In this case, finishing coat can also be applied. Further, it is desirable to use ultra-fast hardening mortar or hard kneading mortar as this mortar, which allows for faster work.

The insert material used in the present invention is an aggregate, cement mortar, or concrete block, which includes various cement products mixed with asbestos, etc., and must have a strength equal to or greater than that of the concrete structure. is desired. Here, blocks made of cement mortar or concrete can be of various shapes such as spherical, crushed, columnar, etc., but it is easier to use a plurality of columns. If the insert is columnar, its cross-sectional shape can be of various shapes such as circular, triangular, or rectangular, or it can be partially irregular in shape. It is preferable to have points or lines of contact and not direct contact over the entire surface, and the length should be slightly shorter than the length of the gap (the wall thickness of the concrete structure). In addition, this columnar insert material may be molded into a long piece and then cut at the site as necessary. You can also make it easier. On the other hand, when using aggregate as the insertion material, it is sufficient to close one opening of the gap with a lid and then insert the material using a chute or the like. In addition, considering the work required, the above-mentioned insertion material is inserted at a volume ratio of 30 to 70% into the void after the piping, and the remaining void, that is, 70 to 30% of the gap between the insertion materials, is filled with the void filler described later. It is desirable to fill the

FIGS. 1 and 2 show an example using a cylindrical insert. An insertion member 4, which is a cylindrical block, is inserted into a gap 3 after the pipe 2 is installed in the concrete frame 1. This insert 4 is slightly shorter than the wall thickness of the concrete body 1, and lids 5a and 5b are provided in the spaces created on both sides of the gap (left and right in FIG. 1). The lid 5a is provided with an air vent hole 6, and the lid 5b is provided with a filling port 7, and a filling hopper 8 is attached to the filling port 7. After this, when filling the void filler, the difference in gravity can be used or it can be press-fitted with a pump. When press-fitting with a pump, the filling port 7 may be provided at the bottom of the lid 5b. Further, the lids 5a and 5b may be formed by filling the space with ultra-fast hardening mortar or hard kneaded mortar after inserting the insertion material 4. In this case, reinforcing material such as iron netting or mesh is used. It is desirable to use them together. In addition, it is also possible to use a separately molded formwork, and depending on the type of insert material, the lid 5
a and 5b may be installed.

The gap filling material used in the present invention may be a cement slurry or a mortar slurry, as long as it completely fills the gaps between the inserted materials and the gap between the inserted materials and the concrete structure, and then hardens to close the gaps. These void fillers are Expan (manufactured by Onoda Cement Co., Ltd.) and CSA (manufactured by Denki Kagaku Kogyo Co., Ltd.).
(manufactured by Sumitomo Cement Co., Ltd.), Gypcal (manufactured by Nippon Cement Co., Ltd.), Eurotux (manufactured by Onoda Cement Co., Ltd.), which is commercially available as an expanding material and non-shrinkage grout material such as aluminum metal powder or iron powder.
), Dascos (manufactured by Denki Kagaku Kogyo Co., Ltd.), Masterflow, Enbeco (manufactured by Nisso Master Builders Co., Ltd.),
Filcon (manufactured by Sumitomo Cement Co., Ltd.), Foil Iguster, Convex, Non-Silink (product name)
It is even better to use one or a combination of two or more of the following.

<Example> Examples of the present invention will be described below.

After installing a pipe with a diameter of 700 mm in a horizontal hole with a wall thickness of 1200 mm and a hole diameter of 1000 mm, the air gap created around the pipe is 0.48 m ³
124 pieces of insert material (compressive strength: 300 Kg/cm ² ), which had been mixed in advance with cement:sand = 1:2 and water ratio of 50% and formed into regular square prisms with a side of 40 mm and a length of 1000 mm, were inserted. Next, commercially available jet cement (Onoda Cement Co., Ltd.) was poured into the spaces created on both ends of the insert.
A 10 cm thick finished mortar lid was formed by filling mortar made by mixing 1:2 cement:sand with a water ratio of 45%. At this time, an elbow pipe (diameter 50 mm) for filling the void was installed on one side of the lid, and a similar elbow pipe was installed on the other side to serve as an air vent. 15 minutes after forming the lid, add 9% of a commercially available non-shrink grout (trade name: Eurotux, manufactured by Onoda Cement Co., Ltd.) to ordinary Portland cement.
This was added to make a cement slurry with a water ratio of 32%, and the work was immediately filled through a hopper installed in the elbow pipe for filling the voids. This work was completed in 2 hours by 2 workers.

For comparison, a void similar to the void described above was filled using a conventional method. First, cement:
Add 25 parts by weight of water to 100 parts by weight of a mixture of sand: non-shrink grout = 1:1:1 to make a hard mortar, then shape it into fist-sized balls and fill them into the void by pushing them with a stick. did. This work required four people and took four hours.

<Effects of the Invention> As explained above in detail with the examples, if the void filling method according to the present invention is used, the void between the concrete structure and the pipe after piping work or the side hole itself can be easily filled. It is economical and can be done with less than half the number of people and time compared to conventional methods. Additionally, this construction method can also be applied to temporary filling methods for parts of other buildings that are to be expanded, such as nuclear power plant construction, thermal power plant construction, and various plant construction works.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing an example of the gap filling method according to the present invention. In the drawing, 1 is the concrete frame, 2 is the pipe, 3 is the void, 4 is the insert material, 5a and 5b are the lids,
6 is an air vent, and 7 is a gap filler filling port.

Claims (1)

[Claims] 1. During construction work to close voids formed in the concrete framework of civil engineering and building structures, after inserting an insert consisting of cement mortar or concrete blocks into the void, super-fast hardening mortar or hard hardening material is applied to both open ends of the void. A lid is formed by embedding kneaded mortar, and either one of these lids is provided with an air vent port and a filling port, or one of the lids is provided with an air vent port and the other is provided with a filling port. A void filling method characterized by filling with a filler of an expandable cement slurry or a non-shrinkable grout slurry containing one or more types.