JPS6313492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a part of underground framework construction, and is a retaining wall constructed by juxtaposing steel materials at appropriate intervals, for example, using the column row construction method using soil cement or the parent pile horizontal sheet pile construction method. A concrete separator is fixedly connected between the steel material and the formwork for producing the underground framework, thereby forming a concrete casting space for producing the underground framework between the retaining wall and the formwork. Concerning formwork construction method for building frame.

In the general formwork construction method, during excavation work after construction of the retaining wall, the position where the separator should be fixed is determined with respect to the steel material that is the main component of the retaining wall. , and the separator was fixed at the determined position using welding means. Fixing the separator to the steel material after the steel material is driven in this way avoids the inconvenience that if the separator and its support metal fittings are attached to the steel material in advance, the separator and its support metal fittings may be damaged or deformed during the driving process. However, when using this construction method, the underground work is relatively narrow in terms of space, the above-mentioned separator fixing position indexing is done manually, and Coupled with the need for scaffolding to perform indexing on vertically oriented steel materials, this method involves many work steps, is inefficient, is dangerous, and has low position index accuracy. In addition, since welding is performed horizontally in a location where there is a possibility of water leakage, it is not only disadvantageous in terms of efficiency and safety, but also causes significant problems in the strength and quality of the welded part and the accuracy of the separator fixing position. It had some easy flaws.

Therefore, in the past, as shown in Japanese Patent Application Laid-open No. 57-197315, for example, a latch metal fitting that can be freely screwed into a separator mounting bolt is attached to the steel material serving as the stake in a detachable manner. , used a technique that eliminated the aforementioned welding work for steel materials. However, such technology can only be applied when constructing a retaining wall using steel material as the parent pile and horizontal sheet piles such as steel plates. It was a technology that could not be adopted or would be meaningless even if adopted. In other words, if the retaining wall is constructed using the column-row construction method using soil cement, which has been widely used in recent years, the above-mentioned positioning must first be done by marking out the soil columns, and by marking the soil columns. It takes a lot of effort to expose the surface of the steel material by drilling or coring, and it is also troublesome, such as having to remove a larger amount of soil than if the separator was simply fixed by welding. Therefore, it was a technology that had no utility as a formwork construction method for retaining walls using soil columns.

In view of the above circumstances, the present invention proposes a mold for producing an underground framework that can easily connect and fix separators in a column construction method using soil cement by a rational means that adds a work process above ground. The purpose is to propose a frame construction method.

The characteristic configuration of the formwork construction method for producing an underground framework according to the present invention, which was taken to achieve the above object, is that the retaining wall is constructed by a column construction method using soil cement, and the retaining wall is Before constructing the concrete separator, a concrete separator screw connection fitting is embedded and fixed in the steel material in advance within the thickness of the soil column with its tip located near the outer peripheral surface of the soil column. The concrete separator is threadedly connected to the metal fitting after construction and before concrete is poured into the concrete placement space, and the functions and effects of the present invention having such features are as follows. It is.

(1) By adopting a pre-installation method in which the metal fittings for fixing the separator are fixed to the steel material before construction of the retaining wall, the separator fixing position can be determined on the ground where there is a sufficiently large working space. In addition, since the long steel material can be carried out in a horizontal position, the indexing work can be carried out easily, efficiently, with extremely high precision, and safely.

(2) By welding the steel material horizontally and downward on the ground, where there is no risk of water leakage, the metal fittings can be fixed to the steel material, which not only improves the efficiency of welding work and ensures safety, but also improves the welding process. The strength, quality, and positional accuracy of the parts can be stabilized.

(3) The metal fittings for screwing and connecting the separators are fixed to the steel material in advance with their tips located near the outer circumferential surface of the soil column, so that the soil portion can reach the surface of the steel material from the outer circumferential surface. The tip of the metal fitting can be exposed by simply removing a small portion of the soil near the outer circumferential surface without having to remove a large area, and the tip can be screwed to the tip without the need for welding. Since all that is required is to do the following, it is possible to perform the separator connection work with high efficiency.

Through the synergy of the above (1) to (3), we were able to shorten the construction period, reduce construction costs, improve quality, and ensure work safety for the entire construction work.

An embodiment of the construction method of the present invention will be explained in detail in the order of steps based on the drawings.

(1) Single or double soil auger (not shown)
Soil pillars 2A made of a mixture of earth and sand (aggregate) and cement grout are constructed in the ground in a row with the adjacent ones partially wrapped around each other, and a reinforcing core material is placed inside each soil pillar 2A. Steel material 1
(Generally, H-shaped steel is used, but other materials such as steel pipes and angle steel are also acceptable). Before constructing the continuous retaining wall 2, on the ground as shown in Figure 2,
The steel material 1 is laid down horizontally, and a concrete separator screw connection fitting consisting of a hollow member with a female thread 5b is placed at a plurality of preset positions along the longitudinal direction of the steel material on the central outer surface of one flange part of the steel material 1. 5 with downward welding means. At this time, the metal fitting 5 is configured to have a protruding length such that its tip 5a is located near the outer circumferential surface of the soil column 2A when the steel material 1 is erected at a predetermined position within the soil column 2A. There is.

(2) Next, each of the metal fittings 5 attached to the steel material 1 in advance
Colored cap 6 for protecting the female thread at the tip of the
Then, as shown in FIGS. 3 and 4, the steel material 1 is erected in the soil column 2A while it is still unhardened. During this erection, as shown in Figure 5, a centering ruler 7 is fixedly installed on the ground surface in order to improve the accuracy of steel erection and leveling, but the metal fitting 5 of this ruler 7 is moved downward. At the corresponding position, there is a cut groove 7 that allows the fitting 5 to pass through.
a is formed.

(3) The above-mentioned continuous retaining wall 2 is created by installing the steel material 1.
With the underground excavation work after the construction of
As clearly shown in FIG. 6, with a part of the soil column 2A removed and the cap 6 removed, screw the male threaded portion 4a of one end of the concrete separator 4 using a metal rod into the female threaded portion 5b of the metal fitting 5. Connect. At this time, the length of the separator 4 is adjusted using the female and male threaded portions 5b and 4a, and is fixed with a nut 8. On the other hand, as shown in FIG. 7, the other end of the separator 4 is made of a butterfly form or a metal form that is assembled in a state where it faces the continuous mountain stopper wall 2 and is supported by a thick piece 9. By firmly connecting it to a form 3 for producing an underground framework, such as the above, a concrete casting space A for producing an underground framework is constructed between the retaining wall 2 and the assembly form 3.

The formwork construction is completed above, but after that, the necessary underground framework is produced by appropriately arranging reinforcement in the space A and pouring concrete. Then, the formwork 3 is removed and repurposed, but the retaining wall 2 is left as is.

FIG. 8 shows another embodiment, in which the metal fitting 5 is composed of a shaft-like member with a male threaded portion 5c,
In this case, a cylindrical one with a bottom is used as the curing cap 6, and a turnbuckle 10 is used to connect the concrete separator 4 and the metal fittings 5, so that the separator 4 is firmly connected in a tensioned state.

[Brief explanation of the drawing]

The drawings show an embodiment of the formwork construction method for producing an underground framework according to the present invention, and FIG. 1 is a schematic plan view of a continuous retaining wall, FIG. 2 is an enlarged perspective view of steel materials, and FIG. 3 is a retaining wall. Fig. 4 is an enlarged view of the main part of Fig. 3, Fig. 5 is an enlarged perspective view of the main part in the steel construction state,
FIG. 6 is an enlarged plan view of the main part showing the procedure for attaching the separator, FIG. 7 is a schematic plan view showing the construction state, and FIG. 8 is an enlarged plan view of the main part showing another embodiment. 1...Steel material, 2...Mounting wall, 3...Formwork, 4
... Separator, 5 ... Screw connection metal fittings.

Claims (1)

[Scope of Claims] 1. Concrete separators 4 are provided between the steel materials 1 of the retaining wall 2, which is constructed with the steel materials 1 juxtaposed at appropriate intervals, and the formwork 3 for making the underground framework.
A method of constructing a formwork for producing an underground framework, which constitutes a concrete casting space A for producing an underground framework between the retaining wall 2 and the formwork 3 by firmly connecting the retaining wall 2 and the formwork 3. 2 is constructed by a column construction method using soil cement, and before constructing the retaining wall 2, a concrete separator screw connection fitting 5 is attached to the steel material 1 in advance, so that its tip 5a is attached to the outer periphery of the soil column 2A. The metal fittings 5 are embedded and fixed within the wall thickness of the soil column 2A in a state close to the surface thereof, and after the construction of the retaining wall 2 and before concrete is poured into the concrete placement space A. A formwork construction method for producing an underground framework, characterized in that the concrete separator 4 is screwed and connected to the concrete separator 4. 2. The formwork construction method for producing an underground framework according to claim 1, wherein the metal fitting 5 is a hollow member with a female threaded portion 5b. 3. The formwork construction method for producing an underground framework according to claim 1, wherein the metal fitting 5 is a member with a male threaded portion 5c.