JPS63241224A - Construction of basement - Google Patents

Abstract

PURPOSE:To shorten the period of construction and make construction work easier by a method in which the ground is excavated, a cut-off layer is provided with a spacing inside of the wall of space, and cement is placed into the aperture between the wall and the cut-off layer for interior. CONSTITUTION:A space 5 for forming a basement is formed, and a cut-off layer 7 is formed with a spacing (l) from the wall 6 forming the space 5. The layer 7 is formed by placing a bag 10 along the wall, and cement 17 is packed into it. The inflow of ground water into the space 5 is prevented, and where water W is present, the water is drained and interior is provided. The cut-off or water-stop layer 7 can thus be easily formed without causing degradation of the wall of the space.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for constructing a basement, and more specifically, a method for constructing a basement in an existing building, which is suitable for constructing a basement in a place where the groundwater level is relatively high. It concerns the construction method.

[Prior art]

In recent years, there has been a trend to construct basements in houses, etc. due to the rise in land prices and the effective use of land.

Furthermore, when building a new house, the basement can be constructed in advance along with the foundation work, so it does not pose a particular problem.

However, when building a basement in an existing building, it is possible to create a basement without affecting the building itself or neighboring existing buildings.
Construction work is often difficult. In particular, there are various problems when an existing building is located in a place where the groundwater level is relatively high.

For example, if the building is located in a place where the groundwater level is relatively high, if the underground space is excavated in advance to form a basement, groundwater will flow into this space. However, if this water is drained, the earth and sand on the soft walls that form the space will collapse, resulting in adverse effects such as tilting of existing buildings and nearby buildings.

Generally, in civil engineering work, if there is a lot of groundwater,
Although water supply boards are installed in advance,
In the case of the basement, there is a problem in that such conventional construction methods cannot be used because the construction is carried out below an existing building.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to construct a basement under a building that is constructed in a place with a high groundwater level. In this case, the aim is to facilitate the construction and shorten the construction period without affecting others.

[Summary of the invention]

The present invention consists of the following plural steps to achieve the above-mentioned object.

(1) First, excavate underground, especially the F section of an existing structure, to create a space.

(21) Next, carve a water stop layer inside the wall at an appropriate distance from the wall that forms this space.

(31) Ladle cement, preferably underwater cement, between the water stop layer and the wall surface, and then drain the water in the water stop layer.

(4) Then, the interior will be constructed using steel frames and panels.

In the present invention, a space is formed by excavating the ground, and a water stop layer is formed at a certain distance from the wall of this space to prevent water from overflowing. A concrete layer is formed in between.

As a water stop layer, ■Method of using a panel, using a bag-like material, especially a bag made of synthetic resin, etc., and pouring concrete into this bag and hardening it to cover the bag with a layer of concrete. There are various methods, such as (1) injecting concrete 1 between the bag and the wall while the bag is inflated to form a water stop layer.

1) A method of suspending a water tank made from synthetic resin at the top) and injecting concrete between the tank and the ground to form a water stop layer) Embodiment] Hereinafter, an embodiment of the method for constructing a land transportation facility according to the present invention will be described based on FIGS. 1 to 8.

(11 In Fig. 1, 1 is a building built on a foundation 2 in advance. An opening 4 is provided in the floor 3 of this building 1, and the opening 4 of 1 and 2 is shown in the figure. Create a space 5 for forming a basement using an excavator or the like (
first step).

The opening 4 is formed by removing the floor of a room, such as a kitchen, where it is not noticeable even if the floor is removed.

At this time, when the water level is high, groundwater W gradually flows into this space 5.

(2) Next, as shown in FIG. 2, a water stop layer 1 is formed at a distance e from the wall surface 6 forming this space 5 (second step).

As shown in FIG. 4, this water stop layer 7 is constructed by planting columns 8 at intervals from the wall surface 6, and using these columns 8, a large number of panels 9 made of wood, synthetic resin, etc. are combined. Configure.

This water stop layer 7 is often made of a plate material as described above, but it is also possible to use a bag 10 as shown in FIG. 5, for example. This bag body 10 has at least an outer membrane material 11 made of a synthetic resin sheet such as a thin vinyl sheet to be deformable, and an inner membrane material 12 made of a relatively rigid plate material, e.g. Formed using a synthetic resin molding machine.

After the bag 10 is arranged along the wall surface, the bag 10 is filled with cement, preferably underwater cement 17. When filling this underwater cement 17, preferably connect the supply hose 13 to the bottom, and
By connecting an air venting hose 14 to one side, air can be discharged together with cement injection.

FIGS. 6 and 7 show still another embodiment of this water stop N7, in which the air bag 15 is filled with gas such as car exhaust gas from a hose 16 to form a wall made of an air bag. be.

Then, as shown in FIG.
is injected and solidified (third step).

Of course, underwater cement 17 is placed on the bottom of the space 5, or as shown in FIG. 7, a frame 18 is placed as a framework, and underwater cement 19 is placed inside this frame 18. The bottom plate 20 may be formed by doing so.

The bottom plate 20 and the water stop layer 7 planted toward the wall surface 6 of the opening 5 are connected by a joint 21 if necessary to prevent groundwater from flowing into the space 5.

Then, after draining the water W existing in the space 5 using a drainage pump, interior decoration is done. Of course, part or all of the water stop layer 7 can be removed if necessary for interior decoration.

FIG. 8 shows another embodiment, in which a basement is constructed by the following steps.

■ First, place the spacer 2 on the wall surface 6 where the space 5 is formed.
5 and reinforcing bars 26 are fixed. Then, underwater concrete is placed on the bottom surface 6a. Then, the internal pressure type bag 10 is inserted so as to be supported by the spacer 25.

The bag 10 is formed using a strong, water-resistant sheet-like material having a base material such as vinyl, rubber, urethane, etc., and reinforced with fibers or the like as necessary.

(2) Further, the bag 10 is held in shape by being supported at its upper end by a hanging frame 28 suspended by a small crane 27.

■ While filling the inside of the bag body 10 with water W, the spacer 25 is
A supply hose 13 is connected between the bag lO supported by the wall 6 and the wall 6.
Inject cement 17.

In this case, water W is injected into the bag 10 by a pump 29 to maintain the shape of the bag 10 by making the pressure inside the bag 10 slightly higher than the outside pressure.

■ In addition, reinforcing bars 26 and spacers 25 are attached to the inner surface of the wall surface 6 in advance, a hole is made in the bottom of the bag body 10, and concrete is poured through this hole to form the bottom surface. form.

Note that by attaching reinforcing bars to the bottom of the bag 10, a reinforced concrete floor can be formed.

Once the floor and wall surfaces have been formed of reinforced concrete through each of the above steps, the bag 10 is removed and a panel is placed inside the reinforced concrete to complete the basement.

〔Effect of the invention〕

As is clear from the above explanation, according to the method of constructing a basement according to the present invention, after forming a space below the structure,
A water stop layer is formed in advance at a certain interval on the inside of the wall of the space using relatively lightweight and small panels or bags, and underwater cement is placed between this water stop layer and the wall. It is distinctive in that it is designed to drain water.

Therefore, there is no landslide on the walls of the space forming the basement, and this water stop layer can be easily formed, so especially when constructing the basement of an existing building, there will be no negative impact on the building. Moreover, it has the effect of being able to be constructed in a short period of time.

[Brief explanation of drawings]

The figures show an embodiment of the method for constructing a basement according to the present invention, and FIGS. 1, 2, and 3 are process explanatory diagrams, and FIG. 4 is a perspective view showing an embodiment of the water stop layer. , FIG. 5 is a side sectional view showing another embodiment of the water stop layer, FIGS. 6 and 7 are side sectional views and partially cutaway perspective views showing still other embodiments of the water stop layer, and FIG. The figure is an explanatory diagram of a method of constructing a basement according to another embodiment. l...Building, 2...Foundation, 3...Floor, 4...
Opening, 5... Space, 6... Wall, 7... Water stop layer, 8... Support, 9... Panel, 10... Bag, 1
1.12... Membrane material, 13.14° 16... Supply hose, 15... Air bag, 17.19... Underwater cement, 18... Frame, 20... Bottom plate, 21 ... joint.

Claims (1)

[Claims] A first step of excavating underground to form a space, a second step of providing a water stop layer at a distance inside the wall surface of the space, and pouring cement into the gap between the wall surface and the water stop layer. A method for constructing a basement, comprising: a third step of installing the water stop layer; and a fourth step of draining the water in the water stop layer and providing interior decoration.