JPS5920816B2 - Recessed backfilling method for underground continuous walls and hardware for forming recessed shelves used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backfilling method for backfilling an underground continuous wall and a metal fitting for forming a shelf for use in the method.

A raised shelf is provided at the bottom of the space between the underground continuous wall and the raised shelf arranged along the inner wall surface of the continuous wall, and mortar or concrete is placed in the corresponding rear leg space and filled and solidified. The restoration method of backfilling is being implemented.

Conventionally, in such a backfilling method, as a means for forming a retractable shelf, for example, as shown in Fig. 1, a method of forming a formwork a, or as shown in Fig. 2, a method of forming a wire mesh as a shelf material is used. A method such as receiving by reinforcing bars d welded to C is adopted.

However, the former method requires the installation of a lifting machine to raise the formwork a to a predetermined height, and if the excavation floor is weak, the foot of the support column e supporting the formwork a needs to be installed. In addition, in places where the wall surface f is uneven, it takes a lot of work to close the gap between it and the formwork a with wire mesh, and this creates a big problem in the construction. Although it will eventually be dismantled, this dismantling is very time-consuming and there is a risk that part of the backfill mortar or concrete g will fall during dismantling, resulting in a lack of work safety.

In addition, since the latter method involves welding reinforcing steel, it requires a group number for a specialist such as a welder, which increases labor costs and
When the distance between the restoring C and the excavation bed is narrow, welding work is difficult to perform, and there is a drawback that it takes time and effort.

Furthermore, it is necessary to cut the reinforcing bars when removing the restoration.
Not only is the work of dismantling the shelves not easy, but there is a risk that the backfill concrete will fall during this dismantling, and there is a drawback that the work lacks stability.

The present invention has been made for the purpose of eliminating the problems of the second class conventional construction method, and embodiments of the present invention will be described below with reference to the accompanying drawings.

When carrying out the construction method of the present invention, the bottom of the space 3 (see Fig. 5) between the underground continuous wall 1 and the recess 2 made of H-shaped steel installed along the inner wall surface of the continuous wall 1 is In order to form a raised shelf, a raised shelf forming metal fitting as shown in FIGS. 3 and 4 is used.

The raised shelf forming metal fittings 4 shown in FIG. 41a, a reinforcing reinforcing bar 42 protruding from the lower end of the hook fitting 41 toward the continuous wall 1, and a reinforcing reinforcing bar 4
2... A wire mesh 43 is also constructed, which is received and fixed thereon by applying a welding means or the like, and such metal fittings 4 are produced in advance at a factory.

In the figure, 44 is a reinforcing horizontal rod, which is provided as necessary.

The raised shelf forming metal fittings 4' shown in FIG. 4 are parallel to each other with an interval sufficient to allow the reinforcing reinforcing bars described below to be inserted therethrough.

A hook portion 41 that rises at the upper end and connects to the flange portion 2a of 2
Two parallel hook rods 41b', 41b with a'
A hook metal fitting 41' that is connected to the lower end of the hook metal fitting 41', and a reinforcing reinforcing bar 42 that is inserted and supported at the lower end of the hook metal fitting 41'.
', and a wire mesh 43' that is received on reinforcing reinforcing bars 42', and the second and other members are assembled at the construction site.

When forming a raised shelf using the metal fittings 4 shown in FIG. 3, as shown in FIG. 6. When the worker's foot is pushed into the space 3 with the worker's feet temporarily hooked to the inner flange portion 2a of 2, the shelf can be raised up to form a shelf, as shown in FIG.

In this case, as shown in FIG. 3, the width is made slightly shorter than the width of the space 3 from which the reinforcing reinforcing bar 42 is protruding, and the wire mesh 43 is extended outward from the tip of the reinforcing bar 42 to be larger than the width of the space 3. If the projecting portion 43a is pushed into the space 3, it will bend upward at an appropriate point along the wall surface and come into close contact with the wall surface, so it will be easy to avoid problems when the wall surface is uneven or there are dimensional errors in the width of the space. Even if there is a gap, it can be raised up and form a shelf without creating a gap.

In addition, when raising the metal fittings 4' shown in FIG. 4 to form a shelf, first raise the front and rear pair of the hook metal fittings 41' and attach the upper end of the hook metal fittings 41' facing the flange parts 2a, 2a. The reinforcing reinforcing bar 42' is hooked on the hook part 41a', and then the reinforcing steel bar 42' is inserted between the lower end parts of the hook hardware 41' which is raised and slightly protrudes downward from the lower end of 2. Push it up to the wall surface of continuous wall 1 and set it.

Thereafter, in the same manner, the reinforcing bars 42' are successively set in the longitudinal direction of the second reinforcing bar 2 using the hook hardware 41', and then a wire mesh 43' is laid on the second grade reinforcing bar 42', and numbered wires are placed as necessary. By tying and fixing it using a rope or the like, it can be raised up to form a shelf as shown in FIG.

This method of restoration forming metal fittings is constructed on site, and the wire mesh 4
Since the width of 3' and the protruding length of the reinforcing bars 42' can be freely adjusted, it is particularly applicable when the wall surface of the continuous wall 1 is uneven or when the space 3 does not pass straight through in the length direction. It is extremely useful.

As shown in FIG. 8, a sheet 5 such as a sheet made of polyethylene or polyvinyl chloride can be laid on the raised shelf thus formed to prevent the mortar from flowing away.

Such a sheet 5 is not particularly required when pouring concrete.

After using the metal fittings 4 (or 4') to form a shelf at the bottom of the space 3, use partitions 6 inside this space 3 at appropriate intervals, for example, at intervals of about 1 to 1.5 mm. and divide it.

Although various materials can be used for the partition 6, a foamed polystyrene plate is particularly advantageous because it is lightweight and easy to handle.

Next, mortar or concrete is poured in the usual manner in each space divided by the partitions 6, and immediately after pouring, a hook hardware 8 is placed in the mortar or concrete layer 7 at the anchor part 8a at the lower end. Bury it.

This state is shown in FIG. This hook hardware 8
may be provided at one location in the center of each block, or may be provided at two locations on both sides as shown in the figure, or may be provided at more locations.

In this way, the construction method of the present invention can perform backfilling using mortar or concrete.

On the other hand, if it becomes necessary to dismantle the backfill when removing the restoration, as shown in FIG. This purpose can be easily achieved by pulling out the hardware 4 (or 4') from the space 3 and then lifting it up in the reverse order of setting and removing it from the space 3.

In this case, for example, if the metal fittings 4 (or 4') are attached to each block one by one, the metal fittings 4 (or 4') can be taken out together with the mortar or concrete block, making the dismantling work even easier. It becomes easier.

In the case of the metal fitting 4', the reinforcing bar 42' is extracted from the hook metal fitting 41' before the block is extracted.

In the present invention, since the hook hardware is used to form a shelf by using a removable hook, the shelf can be formed from the top of the shelf. Not only can it be carried out with only 1 work, but it does not require any skill or experience at all.
Workability can be significantly improved, work efficiency can be improved, and construction period can be shortened.

Furthermore, when dismantling the back-filled mortar or concrete, pull out each block upwards, and simultaneously or following this extraction, remove the metal fittings 4 (or 4') from the back-up. Since it can be recovered, there is no danger of backfill mortar etc. accidentally falling during demolition, and the demolition work can be carried out safely and efficiently.

Furthermore, since the recovered metal fittings 4 (or 4') can be reused with some manual training such as replacing the wire mesh, there is almost no wastage of materials, which is highly economical and reduces backfilling construction costs. I can contribute.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views showing an example of the conventional construction method, respectively. FIGS. 3 and 4 are slope views of the metal fittings for forming a raised shelf used in the construction method of the present invention, and 5- Figure 6 is a vertical cross-sectional view showing a situation in which the metal fittings shown in Figure 3 are used to form a shelf, and Figure 7 is a vertical sectional view showing the metal fittings shown in Figure 4 being used to form a shelf. Figure 8 is a vertical cross-sectional view showing the state of the shelves, Figure 8 is a vertical cross-sectional view showing the situation where sheets are laid on the shelves after being raised up, Figure 9 is a slope view showing the situation where a partition is provided in the backfilling space, Figure 10 is a slope view showing the mortar or concrete placement and setting of hook hardware, and Figure 11 is a slope view showing the situation during backfill dismantling. In the figure, 1 is a continuous wall, 2 is a rising wall, 3 is a space, and 4.4
' is the hardware for forming a raised shelf, 5 is the sheet, 6 is the partition, T
is the mortar (or concrete) layer, 8 is the hook hardware,
9 is a wire.

Claims (1)

[Scope of Claims] 1. A raised shelf is provided at the bottom of the space between an underground continuous wall and a raised wall disposed along the inner wall surface of the continuous wall, and mortar or concrete is installed in the rear leg space. In the backfilling method, which involves pouring, filling and solidifying, a large number of removably hooked metal hooks are used at appropriate intervals in the length direction to create a shelf. Once the space is placed in a predetermined position, the space is divided at appropriate intervals in the length direction and mortar or concrete is placed in each space between each partition. A method of backfilling underground continuous walls that is partially buried. 2. A plurality of hooks that are removably hung at the hook portion at the upper end at appropriate intervals in the length direction of the backing installed along the inner wall surface of the underground continuous wall. hardware,
9 on the reinforcing reinforcing bars and the reinforcement reinforcing bars that are integrally or removably connected from the lower end of the hook hardware toward the underground continuous wall.
A metal fitting for forming a shelf used in the backfilling method for underground continuous walls, consisting of a wire mesh that is hung to form a shelf.