JPH0141786Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a joint part of a precast concrete retaining wall used in residential land development.

[Prior art and its problems]

Such precast concrete retaining walls have L-shaped longitudinal sides, and are constructed by installing a large number of them in a row in the horizontal direction.
Earth is built on the back side, but each retaining wall is fixed to each other by forming joining flanges that protrude toward the back side at the left and right ends, and by passing bolts through the overlapping flanges to secure the ends. This is done by fitting a nut into the By the way, since some gaps are formed between the bolts and the bolt through holes of the joining flange portion, water may enter there and the bolts themselves will rust. Conventionally, the ends of the bolts were slightly recessed from the outer surface of the flange and covered with mortar, while mortar was press-filled around the bolts through injection pipes buried diagonally in advance so as to communicate with the outside. However, since this mortar cannot properly circulate in the narrow gaps, there is a risk that rust prevention will be incomplete.

[Purpose of invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
The object of the present invention is to provide a joint part for precast concrete retaining walls that not only provides a complete rust-preventing effect, but also strengthens the connection between retaining walls by adding such a rust-preventing structure, and provides structural benefits. .

[Key points of the idea]

However, according to the present invention, the purpose of the lever is to connect the flanges protruding from the left and right ends, and to connect these joints with through bolts at the joint part of the precast concrete retaining wall. The opening and the outer opening of the joint surface shall have an enlarged diameter recess for filling the grout material, and the void formed by the enlarged diameter recess of the joint surface shall have an opening to the outside centered on the joint surface. This is achieved by making the grout insertion holes communicate with each other.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, an example of a precast concrete retaining wall will be explained. Fig. 1 is a back view of the retaining wall, Fig. 2 is a side view of the same as above, and Fig. 3 is a side view of the central longitudinal section of Fig. 1. It is made of precast concrete and is manufactured in advance at a PC factory.

The retaining wall 1 has an L-shaped vertical cross section that combines a vertical plate 1a whose surface is an exposed surface and a horizontal plate 1b extending from its lower end to the back side, and has connecting flanges 2 at its left and right ends toward the back side. is installed protrudingly. In the figure,
1c shows a reinforcing beam portion formed in the horizontal direction.
In addition, as long as the basic shape of L-shaped cross section is the same,
The shape of the retaining wall 1 is not limited to that shown, and various shapes are possible.

4 to 6 show an embodiment of the connecting portion of the present invention when the retaining walls 1 are continuous, and the flange portion 2 of each retaining wall 1 is provided with a pipe made of synthetic resin such as vinyl chloride in the width direction. A bolt through hole 3 is formed by embedding a bolt through hole 3, and an enlarged diameter recess 6 is formed in the inner opening of the flange portion 2 of the bolt through hole 3 to receive a nut 5 and to be filled with grout material. .

On the other hand, the outer opening of the bolt through hole 3 located at the joint surface of the flange portion 2 also has an enlarged diameter recess 7.
This recess 7 is formed by overlapping two flanges 2 to be joined to form a cavity 8. And the vacant room 8
A grout insertion hole 9 that opens to the outside is communicated with. The grout insertion hole 9 is formed by combining U-shaped grooves drilled along the joint surface of the flange portion 2 to form a hole with a circular cross section, and is symmetrical with respect to the joint surface.

During construction, retaining walls 1 are arranged, flanges 2 are joined, bolts 10 are inserted into bolt through holes 3, and nuts 5 are fitted and tightened at the ends. and,
Since the nut 5 fits within the enlarged diameter recess 6, mortar 11 as a grout material is filled thereon.

Further, a dumpling-shaped mortar is pushed through the opening of the grout insertion hole 9, and the mortar 12
The vacant space 8, its surroundings, and the grout insertion hole 9 are integrally filled with the grouting hole 9.

In this way, both ends of the bolt 10 are covered with mortar 11, and the part where the joint surfaces are perpendicular is covered with mortar 12 to prevent water from entering, so that the gap between the bolt 10 and the bolt through hole 3 is There is no risk of water remaining and a complete rust prevention effect can be obtained.
Furthermore, the mortar 12 that filled the empty space 8 and the grout insertion hole 9 spans the flanges 2 of both retaining walls 1, and once hardened, it exerts a wedge effect or a cotter effect to connect the retaining walls 1 to each other. It is useful for strengthening the flange portions, and is particularly effective in preventing displacement of the flange portions 2 in the front-rear direction.

[Effect of idea]

As mentioned above, the joint part of the precast concrete retaining wall of the present invention is designed to intensively seal the water inlet around the bolt when bolted, so a complete rust prevention effect can be obtained. ,
Furthermore, by adding such a rust-proofing structure, it is possible to exhibit the structural merit of strengthening the mutual connection between the retaining walls, and it can be constructed easily and quickly without using a press-in device for grouting material.

[Brief explanation of drawings]

Fig. 1 is a back view showing an example of a precast concrete retaining wall, Fig. 2 is a side view of the same as above, Fig. 3 is a side view of the center longitudinal section of Fig. 1, and Fig. 4 is an example of the joint part of the present invention. 5 is a front view of the same, and FIG. 6 is a longitudinal sectional side view of the same. 1... Retaining wall, 1a... Vertical board, 1b... Horizontal board, 1c
...Reinforcement beam part, 2...Flange part, 3...Bolt through hole, 4...Pipe, 5...Nut, 6, 7...Diameter expansion recess, 8...Vacancy, 9...Gout insertion hole, 10...Bolt, 11, 12...Mortar.

Claims (1)

[Scope of utility model registration request] At the joint part of a precast concrete retaining wall where the flanges protruding from the left and right ends are joined and the joint parts are connected by through bolts, the through holes of the bolts are connected to the inner opening and the outer opening of the joint surface. It shall have an enlarged diameter recess for filling grout material,
A joint part of a precast concrete retaining wall characterized in that a grout insertion hole opening to the outside is communicated with a vacant space formed by the enlarged diameter concave part of the joint face centered on the joint face.