JP2573413B2 - Soil retaining wall method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial application field >> This invention integrates a retaining wall (buttress) into a T-shape on the inner surface side of a retaining wall main body composed of an underground continuous wall to stably stand itself. The present invention relates to the improvement of earth retaining wall construction method.

<< Prior Art >> For example, as disclosed in Japanese Patent Application Laid-Open No. 1-219213, a self-standing type retaining wall construction method as shown in FIG. 9 in which a retaining wall is provided is known. In FIG. 9, reference numeral 1 denotes a retaining wall main body composed of an underground continuous wall, and 2 denotes a retaining wall integrally formed in a T-shape on the inner surface side of the retaining wall main body 1. In this self-supporting retaining wall, the driven earth pressure P2 on the front surface and the moment due to the weight W of the wall oppose the overturning moment about the point Q due to the main driving earth pressure P1 applied to the back surface of the retaining wall main body 1, thereby retaining the earth. The wall main body 1 is stably made independent.

<< Problems to be Solved by the Invention >> The construction procedure of the retaining wall method shown in FIG. 9 is as follows. First, a T-shaped groove is excavated, a T-shaped steel cage is set in the groove, and concrete is poured.

In this conventional method, since the construction unit is a T-shape, the connecting portion between the retaining wall main bodies is located at an intermediate position between the retaining walls, and there is a problem in the strength of the retaining wall main body. In addition, T
Because of the letter shape, it was difficult to manufacture, handle, and transport reinforced cages, especially when the retaining wall was long.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object that a retaining wall can be joined to a retaining wall main body sufficiently firmly to be integrated, and the production, handling, and transport of a reinforcing cage can be easily performed. To provide an improved retaining wall method.

<< Means for Solving the Problems >> Therefore, in the present invention, first, a groove for the retaining wall main body is excavated, and a reinforcing cage for the retaining wall main body in which a joint portion with the retaining wall is covered with a joint box and a partition plate. Set in a groove, cast concrete into the groove except for the part covered with the joint box and the partition plate to construct most of the retaining wall body, and then excavate a groove for the retaining wall, After removing the plate, set a reinforcing bar cage for the retaining wall in the groove, cast concrete in the joint box and the portion covered with the partition plate and the retaining groove, and integrate with the retaining wall main body I started to build a waiting wall.

<Operation> At the time of the first concrete placement of the retaining wall body, concrete is not placed on the reinforcing bar at the joint with the retaining wall, and the bare and exposed reinforcing bar for the retaining wall body is next. The second concrete is cast with the reinforcing steel for the retaining wall to be set connected. Therefore, the retaining wall main body and the retaining wall are integrated together with the internal reinforcing bar.

As a result, the retaining wall has a U-shape rather than a T-shape, and the retaining wall does not have a joint at an intermediate position between the retaining walls, thereby strengthening the retaining wall itself. further,
Reinforcing baskets are generally flat and can be stacked, making them easy to manufacture, handle and transport.

<< Embodiment >> FIGS. 1 to 6 show a construction procedure of a retaining wall method according to an embodiment of the present invention.

First, as shown in FIG. 1, grooves 3 for the retaining wall main body are excavated, and as shown in FIG. 2, rebar baskets 4 for the retaining wall main body are set in the grooves 3, respectively.

FIG. 7 shows the details of the reinforcing bar cage 4 for the retaining wall body. A hollow rectangular tube composed of a joint box 5 and a partition plate 6 is attached to both end portions of the reinforcing bar 4. The joint box 5 has a U-shaped cross section, and a hollow square tube is formed by combining the partition box 6 with the joint box 5. The joint box 5 is fixed to a side end portion of the reinforcing bar 4, and the partition plate 6 is slidably mounted on the joint box 5 in a vertical direction. The side end of the reinforcing rod cage 4 is housed in a hollow rectangular tube formed of the joint box 5 and the partition plate 6.

Also, as shown in FIG. 2, the two reinforcing bars 4 and 4 are provided with grooves 3 and 4 so as to keep a predetermined distance between the partition plates 6 and 6.
Set in 3.

Next, as shown in FIG. 3, concrete 7 is poured into the space between the joint boxes 5 on both sides of the reinforcing bar 4 set in the groove 3 for the retaining wall body. That is, concrete is not cast on the portion covered with the joint box 5 and the partition plate 6, and concrete is not cast on the space between the two partition plates 6, 6 of the two reinforcing bars 4. The concrete 7 cast in this step forms the majority of the retaining wall body.

Next, as shown in FIG. 4, a groove 8 for the retaining wall is excavated so as to be perpendicular to the T-shape with respect to the groove 3 for the retaining wall body. The groove 8 has a shape that is continuous with the groove 3 in the space between the two joint boxes 5 and 5 described above.

Next, as shown in FIG. 5, the two partition plates 6 located on both sides of the reinforcing cage 9 are pulled out upward, and the groove 8 for the retaining wall and a part of the groove 3 connected thereto are inserted into the groove 3 for the retaining wall. Is set, and the reinforcing rod 9a of the reinforcing rod basket 9 for the retaining wall is wrapped around the side end of the reinforcing rod cage 4 for the retaining wall body in the joint boxes 5, 5. FIG. 8 shows details of the reinforcing bar basket 9 for the retaining wall.

Next, as shown in FIG. 6, concrete 10 is cast into the groove 8 and a part of the groove 3 in which the reinforcing bar cage 9 for the retaining wall is set and the space in the joint box 5. This concrete 10
Thus, the retaining wall is constructed, and the retaining wall main body made of the concrete 7 that has been divided is continuous, and the retaining wall main body and the retaining wall are integrated together including the internal reinforcing cage.

<< Effects of the Invention >> As described in detail above, according to the retaining wall method of the present invention, the retaining wall main body and the retaining wall have an integrated structure including the internal rebar, so that the joining strength between the both is remarkable. Get higher,
Compared with the conventional retaining wall using a T-shaped reinforced cage, there is no joint at the middle part of the retaining wall main body, and the function of increasing the stability is greatly improved, and it is not a simple retaining wall but an independent mountain retaining wall It can be used, and it is an anti-seismic frame with sufficient strength as an underground building of a building. Further, since the reinforcing rod cage is substantially flat, it is easy to manufacture, handle, and transport.

[Brief description of the drawings]

1 to 6 are views showing a construction procedure of a retaining wall method according to one embodiment of the present invention, FIG. 7 is a perspective view of a reinforcing rod cage for a retaining wall body in the embodiment, and FIG. 8 is an embodiment of the same. 9 is a general explanatory view of a retaining wall with a T-shaped retaining wall in FIG. DESCRIPTION OF SYMBOLS 1 ... Remaining wall main body 2 ... Retaining wall 3 ... Groove for retaining wall main body 4 ... Reinforcing cage for retaining wall main body 5 ... Joint box 6 ... Partition plate 7 ... Concrete 8 ... Retaining wall Groove 9 …… Reinforcing cage for retaining wall 10 …… Concrete

Claims (1)

(57) [Claims] In a construction method for integrating a retaining wall into an inner surface side of a retaining wall main body to stably stand alone the retaining wall main body, first, a groove for the retaining wall main body is excavated, and a joint portion with the retaining wall is joined to a joint box. A steel cage for the retaining wall body covered with the partition plate is set in the groove, and concrete is poured into the groove except for the joint box and the portion covered with the partition plate, thereby constructing most of the retaining wall body. Then, after excavating a groove for a retaining wall, removing the partition plate, setting a reinforcing bar cage for the retaining wall in the groove, a portion covered with the joint box and the partition plate and a retaining wall. A retaining wall construction method characterized by constructing a retaining wall integrated with the retaining wall main body by placing concrete in a ditch.