JPH0471196B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a construction foundation that provides a suitable working surface for the movement of a mobile crane, etc., mainly at a site where a semi-underground nuclear power plant is constructed. It is something.

[Background of the invention]

In general, construction work for nuclear power plants includes:
Fixed large cranes are often used, and their lifting capacity is closely related to the lifting load and the lifting work radius, and especially when the lifting load is the same, the lifting capacity is proportional to the distance of the work radius. Therefore, it is desirable to install the large crane at a position where the lifting radius is as short as possible. For this purpose, it is even known that the large crane is installed inside the reactor building, but in this case,
Since it is difficult to avoid interfering with building construction work until the crane is dismantled, there is a drawback that the construction period cannot be shortened.

Therefore, in general, a base is installed on a temporary work ground for construction outside the building that does not interfere with the construction work inside the building, and as close as possible to the building.
A large fixed crane is usually installed on top of this.

In the above case, when constructing a semi-underground nuclear power plant, the area excavated from the ground surface and formed as temporary ground for construction near the outside of the building, as well as the foundation, which is the building construction area, must be In part, because the foundation for installing the large crane is constructed from bedrock, it goes without saying that it is necessary to carry certain equipment into the building within the operating range of the large crane. stomach.

Figure 1 shows the prototype of a typical semi-underground nuclear power plant known in the art. At approximately the center of the construction site excavated from the ground surface 4, there is a nuclear power generation facility, A reactor building 1 and a turbine building 2 (other buildings and the like are not shown) are located, which house the equipment. Further, around these buildings 1 and 2, a temporary construction ground 3 with an elevation lower than the ground surface is provided by excavation from the ground surface, and further between the ground surface 4 and the temporary construction work ground 3. A relatively steeply sloping access road is provided to connect these areas, and a beveled slope is provided to prevent landslides.

In the conventional example shown in FIG. 1, a temporary frame base 8 is provided which extends horizontally from another ground surface with the same elevation as this, but this point will be described later.

As mentioned above, in the construction of a semi-underground nuclear power plant of the above type, it is normal to install a large fixed crane 7 near the buildings 1 and 2 on the temporary work ground 3 for construction. Therefore, when transporting equipment, etc. to the vicinity of this crane, it is necessary to transport it by vehicle etc. through the steeply sloping and narrow access road mentioned above. For these reasons, it is becoming necessary to rely on separate methods for large suspended items. For this reason, in the case of large-sized items to be lifted, it is generally necessary to secure a surface plate area 50 for large-sized ground assembly work and a member lifting area 51 within the operating range of the large crane, and as a result, Excavation of a huge amount of earth at the beginning of construction and backfilling afterwards requires a great deal of work, time, and cost. Furthermore, since the member lifting area 51 is generally located in the backfilling area, there is also the problem that it interferes with the backfilling work.

Therefore, as a solution to these difficulties, it has been proposed to use the above-mentioned temporary frame platform 8, which makes it possible to carry the suspended member within the operating range of the large crane at the same height from the ground surface. Although this method has the advantage of securing an area for lifting parts during the backfilling period, it also has the disadvantage of requiring a huge amount of work and cost to construct the frame base.

Note that FIG. 2 shows a cross section taken along line A--A in FIG. 1, which will help understand the vertical structure of the construction site. In the figure, 20 indicates the outer wall of the building 1.

As mentioned above, there are various problems in the construction of semi-underground nuclear power plants using conventional methods.
Furthermore, the fact that the large crane is of a fixed type has also been pointed out as a problem in that it interferes with the execution of building construction work because it is installed on the temporary construction work ground near the outside of the building. .

[Purpose of the invention]

The purpose of the present invention is to enable the use of a mobile crane in the construction work of the above-mentioned semi-underground nuclear power plant, and to reduce the excavation area as much as possible to eliminate the difficulties associated with excavation and burying work. The purpose is to reduce the amount of noise and allow parts to be lifted without interfering with construction and civil engineering work.

[Summary of the invention]

The present invention provides a reactor pressure vessel, a reactor containment vessel,
In order to construct a semi-underground building to house equipment such as heat exchangers and turbine generators, there is a building foundation that is excavated from the ground surface and a working ground that is slightly above the ground surface surrounding this building foundation. At the construction site of a semi-underground nuclear power plant, which has a shallowly excavated temporary work ground for construction and an access road formed at an angle from the ground surface to the temporary work ground for construction, The same elevation extends to the vicinity of the building foundation, and forms a platform separated from the temporary work ground by a vertical side wall with a step, allowing the mobile crane to travel, turn, and work on the surface. It is characterized by being constructed to provide.

[Embodiments of the invention and their effects]

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 is a plan view showing an example of a construction site of a semi-underground nuclear power plant to which the present invention is applied, and FIG. 4 is a sectional view taken along line BB in FIG. 3.

The difference in this embodiment from those shown in FIGS. 1 and 2 is that the construction foundation 9, which has the same elevation as the ground surface,
It must be located close to the building foundation 1A for constructing the semi-underground buildings 1 and 2 that house the equipment of the reactor containment vessel, heat exchanger, and turbine generator; Since the mobile crane 10 is located on the construction foundation 9, the enlarged ground assembly work surface plate area 50 and the member lifting area 51 are also located on this construction foundation 9, and other Since these points are the same as those in the example shown in FIG. 1, common parts are given the same reference numerals and their explanation will be omitted.

The construction foundation 9 in this embodiment is provided so as to be located near the building foundation 1A at the same elevation as the ground surface 4 as described above, and its surface is used for traveling, turning, and operation of the mobile crane 10. Since it provides a surface, there will be a vertical difference in level from the temporary construction work ground 3 that is excavated from the ground surface to create a work space for building construction. For this reason, the periphery of the construction foundation 9 is surrounded by isolation vertical side walls 11 between the temporary work ground 3 for construction, the access road 6 provided incidentally thereto, and the slope 5. There is.

This side wall 11 needs to have a structure that can sufficiently withstand the lateral pressure based on the ground pressure of the mobile crane, which is controlled by the soil quality and soil structure of the ground 41 constituting the construction foundation 9. For example, it is in the form of a retaining wall. , a vertical wall structure may be constructed in the form of sheet piles, etc., and further reinforced with anchors (not shown) or the like as necessary.

This construction foundation 9 also includes a mobile crane 1.
If it is a normal ground, it may be used as it is, but in some cases, it may be necessary to strengthen the ground by driving piles into the ground 41, or by using steel plates or reinforced concrete. Curing layer 4 by etc.
2 to distribute the load to the ground.

In this way, the construction foundation 9 is used as it is or to strengthen the ground as described above, but since it is a part that is not excavated from the ground surface, excavation and backfilling are necessary. Needless to say, I don't need it.

Furthermore, in this embodiment, the construction foundation 9 having such a position and structure provides a work surface suitable for lifting predetermined equipment into a reactor building or the like using a mobile crane. Therefore, based on its functions, a mobile crane that performs lifting is capable of traveling, turning, and raising and lowering regardless of whether it is loaded or unloaded. There is no need to carry members and the like into the operating range, and there is an advantage that, as shown in FIG. 3, the position of, for example, the surface plate area 50 for large-scale earth assembly work can be arbitrarily set. Further, due to these advantages, the area near the crane, where various operations are congested during construction work, can be used effectively and for multiple purposes.

Note that the reference numeral 60 in FIG. 3 indicates an access path to the member lifting area 51.

FIGS. 5 to 5 show an example of a procedure for lifting a member onto the construction foundation 9 using the mobile crane 10, and show an example of the procedure for lifting a member onto the construction foundation 9.
The target equipment that has been transported to the appropriate location by the mobile crane 1 that has traveled to the vicinity
0 (see Fig. 5), then rotates and travels in the direction of the building 1 to be lifted, reaching near the edge of the construction foundation 9 (see Fig. 5,
reference).

Next, the equipment is suspended from a predetermined part in the building 1 while the boom is brought down and aligned (see Fig. 5), and the work is completed.

The same procedure can be performed even when the member to be lifted is located in the large-sized ground assembly work surface plate area 50, and by fully utilizing the functions of the mobile crane 10 in this way, suitable member lifting work can be performed. .

Note that the lifting work is not limited to the above example. In other words, since the time required for one crane operation is proportional to the number of operations such as traveling, raising and lowering, and turning, etc., from the viewpoint of shortening the required operation time as much as possible, it is desirable to perform loading operations with as few crane operations as possible. For this purpose, for example, if the target equipment is carried by a vehicle or the like to a position on the construction foundation 9 as close to the building as possible, and the mobile crane 10 lifts the equipment in the attitude shown in FIG. , the turning operation can be omitted. Furthermore, the access road 6 and temporary work ground 3 shown in Figure 3 will be backfilled in stages according to the progress of building construction, but since they will be available for a considerable period of the construction period, By using this, it is possible to carry out loading operations with fewer operations. Figure 6 shows the work situation in this case.
The target equipment is carried in by the lifting, lifting and hanging operations of the boom of the mobile crane 10 which is stopped on the construction foundation 9. This operation has the advantage that the crane does not have to travel in addition to turning.

FIG. 7 shows the advantage of having the construction foundation 9 in this embodiment at the same elevation as the ground surface, on a temporary construction work surface 3 excavated from the ground surface.
It is a figure for demonstrating in comparison with the case where the mobile crane 10 is arrange|positioned above.

As is clear from this figure, when the mobile crane 10 is placed on the temporary work ground for construction (as in the case of Fig. 7), the working radius of the crane is severely restricted due to interference with the outer wall 20 of the building 1. However, in the case of this embodiment (the case shown in FIG. 7), since the mobile crane 10 is located at the height of the ground surface, there is an advantage that interference by the building outer wall 20 is significantly alleviated. It will be understood that

Next, an example of the procedure for constructing the construction foundation 9 having the above structure will be explained.

Figures 8 to 8 show a simple outline of the work when constructing a semi-underground nuclear power plant. Generally speaking, a predetermined area surrounding the reactor building and turbine building is constructed until bedrock 12 is reached. Excavation is carried out using an excavator 72 using the open cut method with a slope. The building is usually a man-made rock (artificial rock) built on the foundation rock.
On top of No. 13, an outer wall with reinforcement is built up sequentially from below. Note that 14 is pine.

Backfilling around the building, construction of the building, and loading and carrying of various types of equipment into the building are performed in accordance with the construction of the building exterior wall 20.

In the general construction work described above, the construction foundation 9 of this embodiment does not excavate the planned area, but maintains the same elevation as the ground surface while separating the area from the excavated area by a side wall. Make it.

In addition to the open cut method, the excavation of the area for the buildings etc. may be performed by the vertical direct excavation method, or by the third method.
As shown in the figure, when an access road 6 is provided between the buildings 1 and 2 and the construction foundation 9 and the construction is carried out using the open cut method, the access road may be backfilled. However, in the present invention, an access path in such a position is not necessarily required.

It has already been stated that the vertical side walls of the construction foundation 9 may be constructed in the form of retaining walls or in the form of sheet piles, but in the example shown in FIG. 8, this is done in the form of sheet piles. That is, as shown in FIG. 8, the steel sheet piles 30 are successively driven into the positions that will become the side walls of the construction foundation 9 using a pile driver 71, and then only the building side of the steel sheet piles 30 is driven. A predetermined amount of excavation is carried out, similar to root cutting, and a surface with the same elevation as the ground surface is left on the opposite side of the steel sheet pile 30. This surface will provide the running and working surface for the mobile crane.

If the earth anchor 31 is required in the sheet pile format, excavate the inside of the steel sheet pile 30 and drive the anchor into the ground 41, and then attach the earth anchor 31 from the ground.
The steel sheet pile 30 may be supported by the ground and then backfilled, or an earth anchor construction method that does not require excavation may be used.

Next, the construction foundation 9 constructed as described above can be constructed by compacting the ground with a ground leveling machine 73, leveling the ground, and curing it by laying iron plates, if the ground is sufficiently strong enough to withstand the ground pressure of the mobile crane. Furthermore, if ground reinforcement is required due to soil quality, etc., an appropriate cultivation layer 42 may be provided. That is, for example, pilings 32 and a curing layer made of steel or reinforced concrete are provided. Note that the construction methods described here, such as leveling, compaction, and piling, may be conventional methods, and if they are performed simultaneously with the construction of the vertical side walls, the construction period can be shortened. In addition, surface curing by laying iron plates belongs to the simplest method that is usually carried out, and curing made of steel is, for example, H-shaped steel and I-shaped steel joined by bolts or welding, and has a large soil bearing capacity. It is known that it can be obtained.

Although the curing method using reinforced concrete takes time to remove, it is easy to construct and provides a large soil bearing capacity, and each of these curing methods can be selected according to necessity and purpose.

[Modifications and application examples of the invention]

Although the present invention has the basic features explained in the embodiments described above, it is possible to expand the range of use as a construction foundation as long as it does not impede building construction. This will further reduce the labor and cost of excavation and backfilling.

Additionally, although construction foundations provide suitable running, turning, and working surfaces for mobile cranes, large fixed cranes may also be installed on the foundation. You can also do it.

Furthermore, since the vertical side walls provided around the construction foundation are generally 10 m or more in length, they may be formed into an appropriate stepped structure in consideration of lateral pressure and the like. In other words, it may be a vertical side wall with a structure in which the lower part protrudes toward the building side with steps with a slight width of one or two steps every few meters, which is preferable depending on the soil quality of the ground. Become something.

〔Effect of the invention〕

The present invention provides the construction of a construction foundation having the structure described above, thereby making it possible to obtain suitable rows, turns, and working surfaces for a mobile crane at desired positions and heights.
This has the advantage that building construction work and backfilling work can be performed without interfering with component lifting work, and the space on the foundation platform can be used effectively for various operations, and the construction foundation section can be Basically, there is no need for excavation and backfilling, so the effect of reducing the burden of work effort, cost, etc. can also be obtained.

[Brief explanation of drawings]

Figure 1 is a plan view explaining the outline of the construction site of a typical conventional semi-underground nuclear power plant;
The figures are a sectional view taken along the line A-A in Figure 1, Figure 3 is a plan view illustrating an outline of the construction site to which the present invention is applied, and Figure 4 is a cross-sectional view taken along line A-A in Figure 1.
The figure is a sectional view taken along the line B-B in Figure 3, Figures 5 to 5 are diagrams for explaining an example of the work procedure for lifting a member according to an embodiment of the present invention, and Figure 6 shows the work procedure for lifting a member from the same access path. Figure 7 shows a comparison of the effects on mobile cranes in the case of the conventional example and in the case of the present invention, and Figures 8 to 8 show the work procedure for constructing the construction foundation of the present invention. It is a figure for explaining. 1...Reactor building, 2...Turbine building, 3...
...Temporary work ground for construction, 4...Ground surface, 5...Slope, 6...Access road, 7...Large crane, 8
...Temporary frame stand, 9...Construction foundation stand, 10...
Mobile crane, 12...Bedrock, 13...Manmade rock (artificial rock), 14...Matsuto, 20...
Building exterior wall, 30...Steel sheet pile, 31...Earth anchor, 32...Pile, 41...Soil, 42...Soil curing layer, 50...Surface plate area for large-sized ground assembly work, 51...Lifting of members Area, 60...access road, 71...pile driver, 72...excavator,
73... Earth leveling machine.

Claims (1)

[Claims] 1. A building foundation that is excavated from the ground surface to construct a semi-underground building that will house equipment for the reactor pressure vessel, reactor containment vessel, heat exchanger, and turbine generator, and the foundation for this building. A semi-underground nuclear power plant comprising a temporary work ground for construction excavated slightly shallowly from the ground surface as a work ground around the section, and an access road formed at an angle from the ground surface to the temporary work ground for construction. At the construction site of a power generation plant, a platform is formed that extends from the ground surface to the vicinity of the building foundation by the same elevation, and is separated by a step from the temporary work ground for construction by a vertical side wall. A construction foundation, characterized in that it is constructed to provide a running, turning, and working surface for a mobile crane.