JPH0545726B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a method for setting and constructing foundation bolts on a foundation made of reinforced concrete in order to attach equipment or tanks to a foundation made of reinforced concrete through the foundation bolts, and a method for installing the foundation bolts on the foundation. This relates to the application tool used in the method.

[Background of the invention]

Current nuclear power plants are huge, single-product plants, and construction work is proceeding with the input of enormous quantities of materials and labor.

On the other hand, construction work for nuclear power plants is required to significantly shorten the construction period and reduce costs due to various power situations. Various studies are currently being conducted, and one major approach is to shorten the construction period by improving construction methods. or,
This construction method improvement can be divided into two types: mechanical construction method improvement and architectural construction method improvement.

Among construction method improvements, the construction method shown in the present invention has become an effective means for shortening the process on both the machinery and construction sides.

Approximately 20,000 foundation bolts are used in a 1,100 MW class nuclear power generation facility, and it is necessary to promote construction methods that shorten the construction period and reduce costs.

Prior art related to the present invention is shown in FIGS. 1 to 7. Figures 1 and 2 show a construction method called the drilling mortar setting method for foundation bolts.

When pouring concrete, a wooden frame 1 for foundation bolt drilling is used to prevent concrete from flowing into the foundation bolt setting position to secure the hole, and when installing equipment, the foundation bolt 7 and mortar 8 are inserted into the hole. This is a construction method that sets the

This construction method cannot be expected to have a high pull-out resistance of the foundation bolts 7, so it is not often used for installation of rotating equipment with many periodic vibrations, and is generally used only for stationary equipment.

The steps of this construction method are explained below.

First, center the foundation bolt setting positions.

Use wooden frame 1 to set up the basic box. As the main wooden frame 1, a "masu"-shaped box generally assembled using nails is used.

Pour foundation concrete up to the height of surface 2. Since the concrete near surface 2 is of poor quality, this surface is chipped up to surface 3 using a chisel or the like. The chipping allowance (difference in height between surface 2 and surface 3) is approximately 25 mm.

Dismantle and remove main frame 1.

A device installation reference surface is set using a mortar block 4 and a packer 5, and the device installation reference surface is chamfered.

A foundation plate 6 for equipment, tanks, etc. is integrated with foundation bolts 7 and suspended.

Finish by pouring mortar 8 up to the foundation surface of equipment tanks, etc.

Figures 3 and 4 show a construction method called the foundation bolt direct method.

This is a construction method in which foundation bolts 10 are directly embedded in concrete using pipe sleeves 9 for foundation bolts when pouring concrete foundations.

When setting, the ease of setting the foundation bolts,
In order to maintain setting accuracy and fix the foundation bolts during setting, they are fixed using a foundation bolt setting frame (hereinafter referred to as template) 11 in preparation for foundation concrete pouring.

The steps of this construction method are explained below.

The set position of the foundation bolt 10 is centered.

A hole is drilled on the template 11 at a position that matches the bolt hole position on the foundation surface of equipment, tanks, etc., and an integrated body of the sleeve 9 and the foundation bolt 10 is attached in advance to the hole and suspended in a predetermined position. Set.

The foundation concrete is placed up to the height of surface 12. Since the concrete near surface 12 is of poor quality, this surface is chipped up to surface 13. The chipping allowance is approximately 25mm.

The pipe sleeve 9 protruding above the foundation concrete is cut to an arbitrary length, and the template 11 is further dismantled and removed.

The equipment installation foundation surface is set using mortar block 4 and packer 5, and the equipment installation foundation is chamfered.

The foundation 14 of the equipment and tank is suspended and set.

Finish by pouring mortar 8 to the base of the equipment and tank.

The drawbacks of the conventional construction methods mentioned above, the drilling mortar setting method for foundation bolts and the direct burying method of foundation bolts, are as follows:
Each will be explained below using the main text and FIGS. 5 to 6.

First of all, there are drawbacks to the drilling mortar setting method for foundation bolts. In this construction method, mortar is injected into the hole of the rectangular parallelepiped, so depending on the water-cement ratio, the mortar may shrink, creating a gap between the concrete surface and the mortar surface. This has the essential disadvantage that the bonding force between the mortar is reduced and the pull-out resistance of the foundation bolt is reduced.

Furthermore, as shown in Fig. 6, when the wooden frame 1 interferes with the reinforcement 17 of the reinforced concrete foundation on the building side, the reinforcement is cut in the middle and reinforcing bars 15 are inserted, or the chain block 16 is used to bend the reinforcement. The construction side had to take measures such as these to set the wooden frame 1 in a predetermined position, which required a large amount of man-hours on the construction side.

In addition, one part of the main wooden frame was fixed to the reinforcement with wire etc. with its face sticking out above the reinforcement, so it could be stepped on by workers, and the inflow pressure of concrete could be affected. Due to the pressure, the wooden frame 1 is deformed or displaced, and repair work requires a large amount of man-hours on the machine side.

Next, we will discuss the disadvantages of the direct burying method of foundation bolts.

This construction method uses equipment,
It has an essential structural disadvantage in that it requires a template 11, which is a temporary facility whose holes have the same position and size as the foundation surface of the tank or the like. Therefore, a large number of man-hours were required to manufacture, install, dismantle, and remove the template.

Furthermore, as shown in FIG. 7, when the sleeve 9 and the construction reinforcement 17 interfere, the reinforcement 17 may be cut in the middle and reinforcing bars 15 inserted, or the chain block 16 may be used to improve the reinforcement. The sleeve 9 had to be bent and lowered at the same time as the template 11 for setting, which required a large amount of man-hours on the construction side.

In addition, since the 9th part of this sleeve is made of steel, when fixing this sleeve part, use a thread.
It is necessary to weld the 9 parts of the sleeve and the reinforcement, and it is necessary to bring welding equipment such as a welding machine to the site where there is a lot of reinforcement, and it requires a lot of man-hours on the machine side (delivery of the welding machine, installation, curing, etc.) At the same time, the work environment was poor, which caused safety issues. Further, in this direct burial method, in order to prevent the foundation bolt 10 from coming off, it is largely dependent on mechanically connecting the foundation bolt 10 to the sleeve 9 with a nut or the like. For this reason, it is time-consuming to mechanically integrate the foundation bolt 10 into the sleeve 9, which must be done for each of the many foundation bolts. If this mechanical connection is not performed, the inner surface of the sleeve 9 is straight, so the sleeve 9
Even if mortar flows inside, the foundation bolts will easily come out along with the mortar.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for setting and constructing foundation bolts that does not require much effort and does not easily come off, and a construction tool for use in the method.

[Summary of the invention]

The present invention relates to a construction method in which a foundation bolt is set using a bottomed hollow structure having unevenness on the inner and outer surfaces on a reinforced concrete foundation, in which the reinforced concrete If the upper reinforcement interferes with the hollow structure, the upper reinforcement is arranged through the upper part of the hollow structure, and an upper cover is placed between the lower reinforcement and the upper reinforcement. The hollow structure that has been applied is installed in accordance with the set position of the foundation bolt, and then concrete is poured to a height where the upper reinforcement and the hollow structure are buried, and then the upper reinforcement is installed. removing the surface layer of the concrete that exists above and removing the top cover of the hollow structure;
A foundation bolt setting construction method characterized in that the foundation bolt is then inserted into the hollow structure and the hollow structure and the foundation bolt are integrated with a solidifying material, and the method can be used for this method. The invention as a setting tool for foundation bolts is a hollow structure with a bottom that is buried in reinforced concrete and has unevenness on the inner and outer surfaces of which the foundation bolt is integrally fixed to the concrete side, wherein the hollow structure with a bottom is , the upper part is provided with a lid and a connecting hole through which the upper reinforcement of the reinforced concrete passes, and the lid is integrated with the side surface of the bottomed hollow structure through a dividing groove. This is a foundation bolt setting tool.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 8 to 11.

A foundation bolt setting tool according to an embodiment of the present invention is shown in FIGS. 8 to 9.

In FIGS. 8 and 9, it is basically cylindrical, and a convex portion 21 protruding from the inside is formed on the outer peripheral side surface of the cylindrical portion. Therefore, the outer surface becomes a continuous surface of the convex portion 21 and the concave portion 22, as shown in FIG. Further, the inner side is a continuous surface with convex portions 23 and recessed portions 24 arranged in the opposite manner to the outer side. Such a pipe is called a corrugated pipe. The lower surface of this cylindrical body is closed with a bottom plate 25. At the upper end of this cylindrical body, a plurality of connecting holes 26 are bored for connecting with the reinforcing bars, as shown in FIGS. 8 and 9. A lid 27 is arranged at a position lower than this hole 26.
This lid 27 is provided integrally with the cylindrical object via a cutout groove 28 for separation.

Therefore, such a setting tool is not suitable for unevenness due to the pressure of pouring concrete liquid from the side.
1, 22, 23, and 24 produce a rib-reinforcing effect, increasing the resistance and forming a hollow sealed structure.

Next, the procedure for setting foundation bolts on a reinforced concrete foundation using the above-mentioned setting tool will be explained.

(1) Of the upper and lower reinforcements 31 and 32 that make up the reinforced concrete that serves as the foundation, the lower reinforcements 31 are installed vertically and horizontally at predetermined positions first.

(2) Next, temporarily place the setting tool with the lid 27 still attached on the lower reinforcement at the setting position of the foundation bolt 33.

(3) After that, arrange the upper reinforcement 32 vertically above the setting tool, and when placing it, if the upper reinforcement 32 intersects with the setting tool, bend the upper reinforcement 32 greatly. The upper reinforcement 32 is passed through the hole 26 shown in FIGS. 8 and 9 of the setting tool as shown in FIG. 10 without cutting it.

(4) Next, the needle reinforcement 34 passed through the hole 26 is placed on the upper reinforcement 32 to prevent the setting tool from shifting from the setting position of the foundation bolt 33. If necessary, a wire wrapped around the lower part of the setting tool is attached to the lower reinforcement 31 to ensure fixation.

(5) After that, concrete 35 is poured up to the surface 36 shown in Fig. 10. At the time of this pouring, cover 2
7 prevents the concrete 35 from flowing into the setting tool.

(6) Next, since the concrete near the surface 36 is defective, the surface layer of the concrete is chipped to the extent that the upper reinforcement 32 is visible. It is desirable that the amount of concrete placed is adjusted appropriately so that the depth of this chipping is approximately 25 mm to 50 mm.

(7) The lid 27 is divided across the groove 28 by the impact of the electric hammer used during the above-mentioned chipping operation to obtain an opening. Since the groove 28 is cut in advance, this division can be easily performed by the aforementioned impact.

(8) Next, chamfer the foundation using mortar block 4 and packer 5.

(9) After that, the integrated product with the foundation bolts 33 attached to the foundation plate 6 of equipment, tanks, etc. is suspended, and the foundation bolts 33 are inserted into the opened setting tool.

(10) Next, as shown in FIG. 11, mortar 8 is poured up to the surface of the base plate 6, and a part of the mortar 8 is also poured into the setting tool.

This completes the work.

In this example, the setting tool was made using a corrugated pipe, but the convex part was formed from a simple cylindrical object, and as a result, the convex part and the concave part were relatively inside and outside due to the convex part. It may be made by processing so that it can occur on the side.

According to this embodiment, since the foundation bolt setting tool has a structure with a lid, when pouring concrete, the setting tool is buried in the concrete as in (5) of the setting construction procedure. In this way, the foundation work can proceed quickly without worrying that the setting tool will shift due to the pouring force or that concrete will overflow into the setting tool. Furthermore,
The chipping work in (6) of the setting construction procedure is also performed using upper reinforcement 32.
Since the setting tool does not protrude too much, it does not get in the way of the work and the work is made easier. Moreover, since the setting tool is placed below the upper reinforcement 32, it will not be touched by an operator, causing misalignment or deformation. Furthermore, there is no need to divide or bend the upper reinforcement 32 or add reinforcing bars, so the work process is shortened.
Compared to the direct embedding method, it does not require mechanical connection of the foundation bolts to the embedded hardware (sleeve), so the work process can be shortened, and compared to the mortar setting method, the pull-out force due to the unevenness is strengthened. Therefore,
A foundation with high pulling resistance can be created easily. Furthermore, since the use of temporary structures that need to be dismantled and removed can be eliminated, the work process can be further shortened.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to construct foundation bolts with high pull-out resistance without any effort.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the foundation after concrete is placed using the conventional mortar setting method, and Figure 2 is
Figure 3 is a vertical cross-sectional view of the foundation after the foundation is completed using the method shown in Figure 3. Figure 4 is a vertical cross-sectional view of the foundation after concrete is poured using the conventional direct method. Figure 4 is a vertical cross-sectional view of the foundation completed using the method shown in Figure 2. Figure 5 is a cross-sectional view of the main parts showing the relationship between the completed foundation and equipment, and Figure 6 is a vertical cross-sectional view of the foundation using the conventional mortar setting method and the relationship between the wooden frame and the foundation. A plan view showing part A as an example, FIG. 7 is a plan view of the conventional direct burying method, and FIG. 8 is a top view of a setting tool used in the method of one embodiment of the present invention. , Figure 9 is the 8th
10 is a longitudinal sectional view showing a foundation after concrete is poured by a method according to an embodiment of the present invention, and FIG. 11 is a sectional view taken along the line A-A in the figure. This is a vertical section of the foundation that was created. 8... Mortar (solidifying material), 21, 23... Convex portion, 22, 24... Concave portion, 25... Bottom plate, 26...
... Hole, 27 ... Lid, 28 ... Groove, 31 ... Lower reinforcement, 32 ... Upper reinforcement, 33 ... Foundation bolt, 34
...Wire, 35...Concrete.

Claims (1)

[Scope of Claims] 1. In a construction method in which foundation bolts are set using a bottomed hollow structure having unevenness on the inner and outer surfaces on a reinforced concrete foundation, above the lower reinforcement of the reinforced concrete, the upper reinforcement of the reinforced concrete If the reinforcing bars interfere with the hollow structure, the reinforcing bars are arranged through the upper part of the hollow structure,
The hollow structure with an upper cover provided between the lower reinforcement and the upper reinforcement is installed in accordance with the set position of the foundation bolt, and then concrete is buried between the upper reinforcement and the hollow structure. Pour to a height,
Thereafter, the surface layer of the concrete above the upper reinforcement is removed, the top cover of the hollow structure is removed, the foundation bolts are inserted into the hollow structure, and a solidifying material is applied to the hollow structure. A method for setting and constructing a foundation bolt, characterized by integrating an object and the foundation bolt. 2. In a hollow structure with a bottom that is buried in reinforced concrete and has irregularities on its inner and outer surfaces, the foundation bolts are integrally fixed to the concrete side, the hollow structure with a bottom has a lid on the upper part and a lid on the top of the reinforced concrete. 1. A foundation bolt setting tool, comprising a connection hole through which a thread is passed, and wherein the lid is integrated with a side surface of the bottomed hollow structure via a dividing groove.