JPH0444528A - Built-up type concrete basement and execution method thereof - Google Patents

Abstract

PURPOSE:To make it easy to form a basement and to promote the efficiency of waterproof work in a construction site by combining blocks with a metal fastening member, and providing a waterproofing and a protection layer to the outsides of bottom plates and side plates of the blocks. CONSTITUTION:Precast concrete blocks of which underground units 1 and 2 are to be constituted are placed by concrete, etc., as a unit at a factory to form a block having a certain size and form in advance. A waterproofing 50 to cover the entire outsides and a protection layer 51 to cover the entire waterproofing 50 are respectively provided to the outside. The underground units 1 and 2 are constructed of a plurality of precast concrete blocks 10, 11, 20 and 21 in a state to divide the underground units 1 and 2 by the surface at a right angle lengthwise of them. In that case, a coupling hardware 30 is constructed among the adjacent blocks 10, 11, 20 and 21, and the coupling hardware 30 is fastened to the blocks 10, 11, 20 and 21 with bolts to link them to each other.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a prefabricated concrete basement suitable as a residential basement and a method for constructing the same, and in particular, it is made by integrating a plurality of precast concrete blocks into a box shape. This invention relates to a basement formed by an underground unit and its construction method.

``Prior Art'' Due to the worsening housing situation in recent years, basements have been installed in ordinary houses as well.

Traditionally, the basements of houses were often configured as underground storage, so the structure was also made up of, for example, container-shaped capsules.
It was installed in a hole dug in the ground via an anchor bolt, and then the hole was backfilled.
reference).

However, since the basement of this type of configuration functions as an underground storage, the overall internal size is small and does not fully satisfy the functions required as a living room in a house. Therefore, in recent years, there has been a trend to make basements made of concrete and make the entire room larger.

Such reinforced concrete basements are generally constructed using cast-in-place concrete, for example. First, use a power shovel or the like to excavate a bit wider than the basement site, then spread gravel at the bottom of the excavation, and pour concrete on top of the gravel. So-called foundation concrete construction will be carried out.

Then, the floor reinforcing bars are arranged in a grid pattern, and concrete is poured onto the floor reinforcing bars. At this time, protruding bars connected to the side wall reinforcing bars protrude from the surface of the concrete at the positions where the side walls will be erected. Set it up so that it does.

Next, after the concrete on the floor hardens, the vertical reinforcements of the sidewalls are connected to the protruding reinforcements protruding at predetermined positions, and the horizontal reinforcements are connected to these vertical reinforcements of the sidewalls, and the reinforcements of the sidewalls are constructed.

Next, formwork was assembled on both sides of the constructed side wall reinforcing bars,
Concrete will be poured inside and the side walls will be constructed.

After the concrete for the side walls has hardened, the formwork is dismantled and the space outside the side walls is filled in to complete the construction.

``Problem to be solved by the invention'' However, in the conventional basement technology, the construction work involves pouring concrete on site, so
There were drawbacks such as poor work efficiency on site and a long construction period.

Moreover, in construction work using cast-in-place concrete, when building side walls, it is necessary to provide space for assembling formwork on both sides of the side wall reinforcing bars, and the ground must be dug wider than the construction area. There were problems such as high cost.

Therefore, as a result of intensive research to solve these problems, the inventors of the present invention found that if the entire basement was constructed by joining precast concrete blocks, work efficiency on site would be improved. They came up with the idea that the area required for excavation would be small because this would result in the formation of

However, even if the inside of the basement is simply partitioned and each block is divided into blocks, the size of the blocks themselves will increase, and there are still issues to be solved, such as the need for additional work to join the blocks together. .

Furthermore, if the basement is made of precast concrete, special consideration must be given to its waterproofing, and problems remain, such as waterproofing work reducing work efficiency on site.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to make it possible to easily form a basement made of precast concrete blocks with a simple structure, and to improve the efficiency of waterproofing work on site. An object of the present invention is to provide a prefabricated concrete basement that can be improved and a construction method thereof.

"Means for Solving the Problems J" In order to achieve the above object, the basement of the present invention is a rectangular box-shaped underground unit whose top surface is open by a bottom plate part and a side plate part surrounding the bottom plate part. A prefabricated concrete basement constructed by arranging a plurality of adjacent underground units and interconnecting and integrating the adjacent underground units, the underground unit being divided into a plurality of units along a plane orthogonal to the longitudinal direction of the underground unit. The blocks are made of precast concrete blocks, and these blocks are integrated by metal fastening members, and a waterproof layer covers the entire outer surface of the bottom plate and side plate of the block, and a protective layer covers the entire surface of the waterproof layer. It is characterized by having the following.

In addition, in the basement construction method according to the present invention, a plurality of rectangular box-shaped underground units each having an open top surface formed by a bottom plate portion and a side plate portion surrounding the bottom plate portion are arranged adjacently in the width direction. A construction method for a prefabricated concrete basement in which underground units are interconnected and integrated, the underground unit being divided into a plurality of planes orthogonal to the longitudinal direction thereof, and a bottom plate portion and opposing side plates are constructed. The main body is U-shaped in longitudinal section, and the end wall is made up of a bottom plate and side panels surrounding three sides of the bottom plate. These parts are made of precast concrete as a main block and a end wall block, respectively. At the same time as manufacturing, a waterproof layer that covers the entire outer surface of the bottom plate and side plate of the main block and the gable block, and a protective layer that covers the entire surface of the waterproof layer are provided on the outer surfaces of the bottom plate and side plate of the main block and the gable block. The main body blocks are arranged on the base, each block is installed on the base, and adjacent blocks are integrally connected to each other.

"Operation" According to the present invention, an underground unit is constructed using a plurality of precast concrete blocks that are divided along a plane perpendicular to the longitudinal direction, and these blocks are installed inside a root cut hole. Since the underground unit can be constructed by connecting in the length direction, assembly on site can be easily carried out.

Moreover, in the present invention, a waterproof layer covering the entire outer surface of the bottom plate part and the side plate part constituting the block and a protective layer covering the entire surface of the waterproof layer are provided on the outer surfaces of the bottom plate part and the side plate part, respectively, so that the waterproofing work at the site is simplified. be able to.

"Example" Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a process diagram showing a construction method for a prefabricated concrete basement according to the present invention, and FIG. 2 shows an example of the structure of a basement construction block used in this construction method.

First, with reference to these FIGS. 1 and 2, the basic concept when implementing the construction method according to the present invention will be explained. If the basement is made of precast concrete, the problem is simply dividing the interior of the basement to be constructed,
Even if each of these is divided into blocks, the size of the blocks themselves will increase, and the number of types will increase, making it difficult to carry out construction on site.
This complicates the work and makes on-site waterproofing work troublesome.

Therefore, in the present invention, the basement to be constructed is composed of a rectangular box-shaped underground unit (two types of underground units 1.2 in the example) whose upper surface is open by a bottom plate part and a side plate part surrounding the bottom plate part. However, in this case, considering the ease of transporting the blocks to the site and the workability of installing the blocks, in order to improve the transportability and workability, the above-mentioned underground units 1 and 2 are replaced with underground units. The first feature is that it is composed of a main block 10.20 with a U-shaped longitudinal section divided by a plurality of planes perpendicular to the longitudinal direction, and end wall blocks 11.21 forming both ends of the underground unit. .

In addition, in the present invention, as shown in FIG. 2, in consideration of waterproofing work on site, the outer surfaces of the bottom plate portions and side plate portions of the main body block 10.20 and the end wall block 11.21 are provided with these outer surfaces, respectively. The second feature is that a waterproof layer 50 covering the entire surface and a protective layer 51 covering the entire surface of the waterproof layer are provided.

FIGS. 3 to 12 show specific examples of basements constructed by this construction method. In the figures, reference numeral G indicates a basement, and reference numeral H indicates a residential building placed on top of this basement.

The basement G has two kinds of rectangular box-shaped underground units 1.2 each having an open top surface formed by a bottom plate Y and a side plate S surrounding the bottom plate Y, which are adjacent to each other in the width direction (in the illustrated example, the underground unit 1.2 is an underground unit). The underground units 1 and 2 are arranged in an adjacent state on the left and right with the units 2 in between, and the adjacent side plates of the underground units 1.2 are connected to each other via connecting bolts and connecting hardware that pass through the side plates. The basic configuration is such that the blocks constituting each underground unit 1.2 are integrated by a PC steel material (metal fastening member) 13 that passes through these blocks. In the illustrated example, two types of girders 14.15, long and short, connecting each block are placed on the upper end of the main body block 10.11, and the underground unit 1.2 also acts as a foundation. A building H such as a house is placed on top.

The underground unit 1 constituting the left and right sides of this basement is constructed by connecting a plurality of precast concrete blocks 10 and 11 divided along a plane orthogonal to the longitudinal direction of the underground unit with water-stop joints interposed between them. PC steel material 13 penetrating the bottom plate of the block and the block 10.11
The basic structure is such that the frame is integrated with the upper end of the frame via a girder 14.

More specifically, each of the main body blocks 10 and 11 is manufactured in advance in a factory to have a predetermined shape and size, which will be described later, and the main body block 10 constitutes the central part of the underground unit l. Also, gable wall block 11
constitute the end walls at both ends of the underground unit 1.

These main block 10 and end wall block 1
1 arranges gable wall blocks 11 on both sides of the underground unit 1, and with the main body block 10 interposed between these gable wall blocks 11, the end faces of each block 10.11 are butted against each other, and these blocks are penetrated. PC steel material 13
A prestress is introduced by tensioning the blocks, and each block is thereby firmly connected to form an underground unit l.

In addition, the main body block 10 that constitutes this underground unit 1
As shown in FIG. 2, the bottom plate 10a and the opposing side plates 10b and loc form a U-shaped longitudinal section, and the outer surfaces of the bottom plate 10a, side plates 10b and loc of the main block 10 A waterproof layer 50 covering all of these outer surfaces and a protective layer 51 covering the entire surface of the waterproof layer 50 are provided, respectively, to prevent groundwater from seeping into the basement from the ground side.

The waterproof layer 50 is preferably constructed by pasting waterproof sheets such as rubberized asphalt, persulfurized rubber, or vinyl chloride sheets on the bottom plate and side plate of the block, but the present invention However, the waterproof layer 50 is not limited to such a configuration, and may be configured by applying an asphalt-based waterproofing material or the like to the wall surface.

Further, as the protective layer 51 for protecting the waterproof layer 50, a layer constructed by pasting a plastic board or the like on top of the waterproof layer 50, for example, can be applied, but it can be made such that it does not stick directly onto the waterproof layer 50. Any other configuration may be used as long as it is suitable.

Note that the bottom plate portion 10a constituting the block IO has a fifth
As shown in the figure and FIG. 6, a recess 10d is formed to accommodate the connecting hardware 30, and a bolt 32 is inserted into the recess 10d to fasten the connecting hardware 30, which is mainly made of a single plate-shaped steel plate F1. An insert 31 for screwing is embedded.

On the other hand, the side plate portion 10b that constitutes the block 10.

Side plate part 1 on the side of 10c that is joined to the underground unit 2
The thickness W of 0c is set to approximately 2/3 of the thickness T of the other side plate portion 10b, so that when the side plate portions are overlapped, the wall thickness of this portion is thicker. Care has been taken to ensure that this does not occur (see Figure 1).

As shown in FIG. 7, the thin side plate portion 10c is provided with an insertion hole 10e through which a connecting bolt 29 for connecting the underground unit is inserted, if necessary, and at the upper end of the side plate portion 10c. , as shown in FIG.
．． An insert 17 for screwing in a long bolt 16 for fixing the bolt 15 is buried therein. In the illustrated example, the long bolt 1
6 is a shaft body 16a formed with a male thread, and this shaft body 16
A nut 16 is screwed onto the upper part of a through a fixing plate 16b.
It is mainly composed of c.

Incidentally, as shown in FIGS. 9 and 10, the side plate portions 10b and 10c are provided with bolts and nuts 18 as necessary.
A joint metal fitting 18 having a structure that is fastened by a and 18b is attached.

On the other hand, the gable wall block 1 that constitutes both ends of the underground unit
1, as shown in FIG. 11, a bottom plate portion 11a formed in a rectangular shape and a side plate portion 11 surrounding three sides of the bottom plate portion 11a.
b, 1lcS lld, and in the embodiment, the side plate portion 11c constitutes the end wall of the room unit 1.

In this gable wall block 11 as well, a waterproof layer 50 covering the entire outer surface of the bottom plate part 11a and the side plate part 11b of the gable wall block 11 and a protective layer 51 covering the entire surface of the waterproof layer 50 are provided, respectively. A recess lie in which an insert 17 for screwing a long bolt 16 is buried is formed in the bottom plate part 11a, and the thickness W of the side plate part lid on the side to be joined to the underground unit 2 is equal to the thickness of the other side plate part 11b. It goes without saying that the size of the block 11 is set to approximately 273 mm, so that when the side panels of adjacent underground units are overlapped, the thickness of the wall in this area does not become too thick. Needless to say, inserts 17 for screwing in long bolts 16 for fixing the circumferential beams 14 and 15 are embedded in the upper ends of the respective side plate portions 11b, llc, and 11d, as shown in FIG.

Next, the configuration of the underground unit 2 sandwiched between the underground units 1 will be explained.

This underground unit 2 is also basically composed of a plurality of precast concrete blocks (main block 20, end wall block 21 ) are connected to each other with a water-stop joint material interposed, and the PC steel material 13
The block 2 is assembled integrally with the block 2.
0 and 21, two types of girders 14 and 15, long and short, are placed across the frame so as to connect these blocks.

In addition, there are two types of blocks 20 that make up the underground unit 2.
．． Among the blocks 21, the block 2o is formed in a U-shape in longitudinal section by a bottom plate part 20a and opposing side plate parts 20b and 20c, and the blocks 21 at both ends of the underground unit 2 are formed by a bottom plate part 21a formed in a rectangular shape and this bottom plate. It is formed by side plate parts 21b, 21c, and 21d that surround three sides of the part 21a, and a waterproof coating is provided on the outer surface of each of the bottom plate parts 20a, 21a and the side plate parts 20b, 20c, 21b, 21c, and 21d, respectively. The point that a protective layer 51 that covers the entire surface of the layer 5° and the waterproof layer 50 is provided.
This is similar to the previous blocks 10 and 11.

However, in this underground unit 2, due to the structure in which it is installed between the underground units), the block 20 that constitutes the center of the underground unit 2 and the block 21 that constitutes the end wall of the underground unit are opposed to each other. The left and right side plate portions 20b, 20c, 21b, and 21d each have a thickness of approximately 2/2 of the thickness T of the side plate portion 10b that constitutes the outer wall of the block IO.
It is characterized by being formed in the size of 3.

In addition, also in these blocks 20.21, the side plate portions 20b, 20c, 21b, 21c, 21d of each block
long bolts 1 that fasten the girders 14 and 15, respectively, to the upper ends of the
Regarding the points of burying the insert 17 for screwing in the underground unit 6, the point of attaching the joint hardware 18 to the side plates 20b, 20c, etc. as necessary, and the point of providing the insertion hole 20e for passing the connecting bolt 29 for connecting the underground unit, etc. This is similar to block 10.11 described above.

To explain the two types of girders 14 and 15, long and short, which extend over the upper ends of the blocks 10 and 11, each girder 14.
Blocks 1 15 are each formed into a rectangular column shape by precast concrete and connected in the longitudinal direction.
It fixes the upper ends of O111, 20, and 21, and supports the first floor panel of the upper building (a house in the illustrated example).The long girder 14 is attached to the side plate part along the longitudinal direction of the room unit 1. It is fixed by long bolts 16 passing through the upper and lower sides of the girder 14.

As shown in FIG. 12, a mounting part 14a on which a short girder 15 is placed is formed protrudingly on the side of the girder 14, and a long bolt passing through the upper and lower sides of the short girder 15 is formed. 16
By screwing into the insert 17, the mounting part 14a
It can be firmly fixed to the

Although the short girder 15 is made of precast concrete in the embodiment, it may be made of H-beam steel.

By the way, for the house H, for example, a unitized floor panel is laid on the girder 14, and a first floor wall panel, a second floor floor panel, and a second floor wall panel are assembled thereon.
Furthermore, the structure of the house is not limited to these, but it can be constructed using conventional construction methods. It may be a property, a unit house, etc.

In addition, in the case of a house constructed using each of the panel construction methods described above, the connection between the house and the girder is achieved by, for example, providing an anchor bolt protruding from the upper surface of the girder, and then attaching panels such as walls and floors via these anchor bolts. All you have to do is integrate them.

Next, a method of actually constructing a basement using the underground unit configured as described above and its operation will be explained.

First, each precast concrete block constituting the underground unit 1.2 is formed by pouring concrete into a fixed size and shape in advance in a factory, and each of the precast concrete blocks is formed by pouring concrete etc. into a fixed size and shape in advance, and each of the precast concrete blocks that make up the underground unit 1.2 is formed by pouring concrete etc. Waterproof layer 50 and a protective layer 5 covering the entire surface of the waterproof layer 50
1 is provided.

Then, these blocks are transported to the work site by truck, but at this time, the blocks are formed into a U-shaped cross section divided by a plane perpendicular to the longitudinal direction of the room unit, so the shape of the block is Two types are required: one that forms the center of the unit and one that forms the gable wall. Especially when configuring a large basement, it can be accommodated by increasing the number of U-shaped blocks. Therefore, there is no need to increase the size of the block itself, and transportability to the site can be extremely improved.

Next, to assemble the basement at the site, the roots of the ground where the basement is to be constructed are cut, a hole of a specified size is dug, and then the process of quarrying the ground and placing concrete is carried out. , the foundation is constructed, and at this time the blocks are installed by embedding steel pipes 40 that serve as level standards (see Figure 1 (a)).

Next, the blocks are lifted from the truck using a crane, etc., and then assembled and joined one after another.The assembly order is shown in Figure 1 (B) to (H).
The process is carried out by

That is, the first installation starts from the center of the arrangement (in the example, the center of the room unit 2) as shown in FIG. 1(B), and as shown in FIG. 1(C), this block The blocks 10 of the room unit 1 are joined to the left and right sides of the room unit 20.

At this time (when joining the blocks 10 of the room unit 1 on the left and right sides), the connecting hardware 30 is passed between the blocks 10 and 20, and each block is integrated using a connecting bolt passing through these blocks.

After that, while joining the blocks 20 of the room unit 2 in the axial direction, the blocks 10 of the room unit 1 are installed and joined on the left and right sides of the blocks 20 each time, and finally the blocks forming the end wall 11. Install 21.

After that, while joining the blocks 20 of the underground unit 2 in the axial direction, the blocks 10 of the underground unit 1 are installed and joined each time on the left and right sides of the blocks 20, and finally the blocks forming the gable wall. 11.21 is installed, the PC steel material 13 is inserted into the sheath hole of each block, and prestress is introduced by tightening it with jacks and fixing both ends (see Fig. 1 (e)). Note that after tensioning the PC steel material 13, grout is filled into the sheath pipe.

After tensioning the PC steel material 13, as shown in Fig. 1 (F), a long girder 14 is installed on the side plate of the underground unit, and then a short girder 14 is installed as shown in Fig. 1 (G). Assemble the beams 15 and complete the framework of the basement.

As described above, the tension of the PC steel material 13 and the girder 14.1
After completing the installation in step 5, inject grout between the bottom plate of the block and the foundation concrete, fill the gap between the bottom plate and the foundation concrete with grout, and attach the bottom plate of each block to the foundation. Bring it into close contact.

Then, when the internal finishing work is finally completed,
The basement as shown in Figure 1 is completed.

On the other hand, when constructing the house H, for example, when the house is mainly composed of panels, the girders 14.1
Lay unitized floor panels on top of 5, assemble the first and second floor wall panels on top of that, and then assemble the framework,
The method used is to construct a building by assembling timber frames and assembling roof panels.

Each wall panel on the first floor may be fixed together by inserting a hole at the lower end of the wall panel into an anchor bolt protruding from the upper surface of a concrete girder and tightening the bolt.

According to the above procedure, the blocks are installed from the center of the arrangement, and the blocks are assembled to the left, right, front, and back of the block. Therefore, each block can be installed and joined inside the root cut hole with high precision. It can be implemented. In other words, in this embodiment, other blocks are joined based on the main body block located in the center of the basement, so that no block is far away from the reference main body block. Since the deviation can be made small, the joining work can be carried out with high precision.

Further, in the example, the underground unit 1.2 is constructed by a plurality of precast concrete blocks 10.11.20.21 divided by a plane perpendicular to the longitudinal direction, and these adjacent blocks 10.11.20. .21, the connecting hardware 30 is passed between the frames, and the connecting hardware 30 is bolted to the blocks 10, 11, 20, 21 to connect the blocks, so the blocks can be connected in the longitudinal and width directions. They can be easily connected, can be constructed as underground units, and can be easily assembled on site.

Moreover, in the present invention, the block 10.11.20.2
1 are provided with a waterproof layer 50 that covers the entire outer surface and a protective layer 51 that covers the entire surface of the waterproof layer, which simplifies the waterproofing work at the site. There are advantages.

Further, in the embodiment, the blocks 10.11.20.21 constituting the room unit have side plate portions to be joined having a thickness approximately 2/3 that of the other side plate portions, so that the side plate portions are mutually connected to each other. Since the side walls that serve as partitions do not increase in thickness even when they are joined and stacked, even in a basement where multiple room units are connected in the width direction, members can be used effectively, and internal partition walls can be It has the advantage that the thickness does not increase.

Furthermore, in the embodiment, the blocks of adjacent room units are integrated by bolts that pass through the side plates of the blocks, so there is no difference in level between the room units, and the blocks of the adjacent room units are integrated. Since they are firmly connected, there is an advantage that the strength of the structure can be improved.

In addition, since the structure is such that house H is assembled on top of the girders in the basement, it is possible to omit the construction work of the foundation that was previously required, and there is no restriction on the position of the foundation. Since the basement can be formed without being damaged, there is an advantage that a large basement can be easily constructed.

It should be noted that the present invention is not limited to the embodiments described above, and it goes without saying that the size, shape, etc. of the blocks can be changed depending on the design requirements. In addition, it goes without saying that each block forming the entrance to a room may have an opening forming the entrance, if necessary, and in such a case, the bottom plate parts may be connected to each other. The room units are integrated.

"Effects of the Invention" As explained above, according to the present invention, the following excellent effects can be achieved.

(a) According to the basement according to claim 1, a plurality of rectangular box-shaped underground units each having an open top surface formed by a bottom plate part and a side plate part surrounding the bottom plate part are arranged adjacently in the width direction, A prefabricated concrete basement formed by interconnecting and integrating underground units, the underground unit being composed of a plurality of precast concrete blocks divided along a plane perpendicular to the longitudinal direction of the underground unit, and , these blocks are integrated by a metal fastening member, and furthermore, a waterproof layer covering the entire outer surface of the bottom plate portion and the side plate portion of the block, and a protective layer covering the entire surface of the waterproof layer are provided respectively. Therefore, an underground unit can be formed by a simple operation of connecting the blocks in the longitudinal direction, and assembly can be easily carried out on site. The waterproof layer and the protective layer that covers the entire surface of the waterproof layer,
This has the advantage of improving the waterproof performance of underground units.

(b) In the construction method according to claim 2, a plurality of rectangular box-shaped underground units each having an open top surface formed by a bottom plate part and a side plate part surrounding the bottom plate part are arranged adjacently in the width direction, A construction method for a prefabricated concrete basement in which underground units are interconnected and integrated, the underground unit being divided into a plurality of planes orthogonal to the longitudinal direction thereof, and a bottom plate portion and opposing side plates are constructed. The main body is U-shaped in vertical section, and the end wall is made up of a bottom plate and side panels surrounding three sides of the bottom plate. These parts are made of precast concrete as a main block and a end wall block, respectively. At the same time as manufacturing, a waterproof layer that covers the entire outer surface of the bottom plate and the side plate of the main block and the gable block, and a protective layer that covers the entire surface of the waterproof layer are provided on the outer surfaces of the bottom plate and side plate of the main block and the gable block. The feature is that the main blocks are placed in the basement, each block is installed on the foundation, and adjacent blocks are integrally connected to each other, so it is possible to increase the size of the basement without increasing the size of the blocks themselves. This has the effect of making it extremely easy to transport the blocks to the site, and simplifying the waterproofing work at the site.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 (a) and 2) are perspective views showing the construction process of this basement.
The figure is a perspective view showing an example of the structure of a block used in this construction method, Fig. 3 is a sectional view showing a house placed on top of a basement, Fig. 4 is a side sectional view, and Fig. 5 is a sectional view showing a house placed on top of a basement. A plan view showing the connecting hardware that connects adjacent underground units, Fig. 6 is a sectional view thereof, Fig. 7 is a sectional view showing the connecting structure of the side plates of adjacent underground units, and Fig. 8 shows the connecting structure between the girders and the side plates. 9 is a plan view of a joint fitting that connects the blocks, FIG. 10 is a sectional view thereof, FIG. 11 is a perspective view of the blocks constituting the end wall, and FIG. FIG. 3 is a cross-sectional view showing the structure of a girder joint. G...basement, H...house, 1.2.
3.4...Room unit, 10.11.20.
21...Precast concrete block, 14.15...Beam, 16...Long bolt, 17...Insert, 18...
Joint hardware, 30... Connecting hardware.

Claims (1)

[Scope of Claims] 1) A plurality of rectangular box-shaped underground units each having an open top surface formed by a bottom plate portion and a side plate portion surrounding the bottom plate portion are arranged adjacently in the width direction, and adjacent underground units are connected to each other. It is a prefabricated concrete basement that is interconnected and integrated, and the underground unit is composed of a plurality of precast concrete blocks that are divided in a plane perpendicular to the longitudinal direction of the underground unit, and these blocks are The block is integrated by a metal fastening member, and furthermore, the bottom plate portion and the side plate portion of the block are provided with a waterproof layer covering the entire outer surface and a protective layer covering the entire surface of the waterproof layer, respectively. A prefabricated concrete basement. 2) A plurality of rectangular box-shaped underground units with open tops formed by a bottom plate and side plates surrounding the bottom plate are arranged adjacent to each other in the width direction, and the adjacent underground units are joined to each other and integrated. A method for constructing a prefabricated concrete basement, comprising: dividing the underground unit into a plurality of planes perpendicular to the longitudinal direction thereof, and constructing a main body having a U-shaped longitudinal section, consisting of a bottom plate portion and opposing side plate portions. and a gable wall portion consisting of a bottom plate portion and a side plate portion surrounding three sides of the bottom plate portion, and each of these parts is manufactured as a main body block and a gable wall block using precast concrete, respectively, and these main block and gable wall block are manufactured using precast concrete. A waterproof layer that covers the entire outer surface and a protective layer that covers the entire surface of the waterproof layer are provided on the outer surfaces of the bottom plate and side panels, respectively, and the main block is placed between the end wall blocks of these blocks to separate each block. A construction method for a prefabricated basement made by Rank Lead, which is characterized by installing it on the foundation and integrally connecting adjacent blocks to each other.