JP2002054161A - Method for construction and execution of concrete retaining wall by means of precast concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the realization of a reduction in cost by allowing the standardized product of a precast concrete retaining wall to be mass-produced in a factory in advance and permit the term of work to be shortened by bringing efficiency to site construction in relation to a method for construction and execution of an earth retaining wall for a sloping ground. SOLUTION: The main body 3 of the precast concrete retaining wall having a base 1 and a vertical wall 2 is produced in the factory in advance. Not only a base extending panel 5 added to the end of the base 1 of the main body 3 but also a vertical-wall extending panel 7 added to the upper end of the vertical wall 2 is produced for preparation as a precast concrete member in the factory. Either of the extending panels 5 and 7 is selected according to the circumstance of each job site and added for use to each of the ends of the main body 3 by a coupling means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method and a construction method of a retaining wall on a slope when constructing a road, a residential area, a park, or the like.

[0002]

2. Description of the Related Art A concrete retaining wall in which a bottom plate and a vertical wall are integrated into an L-shape as described in Japanese Patent Application Laid-Open No. 2-80718 is frequently used.

[0003] As a method of constructing a concrete retaining wall, an L-type integrated precast concrete retaining wall has been actively used due to problems such as labor saving of on-site work, shortening of a construction period, and quality control. Have been.

[0004]

By the way, an integrated precast concrete retaining wall conventionally molded in a factory is:
It is manufactured according to the construction drawing drawn based on the on-site survey. In other words, it is a build-to-order production in which each site is integrally molded based on a design suitable for the situation of each site.

[0005] For this reason, it is currently impossible to mass-produce the product as a standard product in advance, and the delivery date is not in time. At present, precast concrete retaining wall factories are increasing the number of workers or working overtime to reduce the waiting time for products. As a result, product costs increase.

[0006] The technical problem of the present invention is to focus on such a problem and to realize a cost reduction by making it possible to mass-produce a standard precast concrete retaining wall in a factory in advance, and to improve the efficiency of site construction. To shorten the construction period.

[0007]

The technical problem of the present invention is solved by the following means. A precast concrete retaining wall body having a bottom slab and a vertical wall is preliminarily manufactured at a factory, and a bottom slab extension panel to be added to the tip of the bottom slab of the main body is also extended to the upper end of the vertical wall. Panels are also factory-produced and prepared as precast concrete members, and according to the situation at each site, each of the extension panels is added to each end of the main body by connecting means and used, and the precast concrete is used. How to build a retaining wall.

As described above, the main body of the precast concrete retaining wall having the bottom slab and the vertical wall and the extension panels of various dimensions are previously produced at the factory, and the extension panels are selected according to the situation at each site. Since it is used by being added to each end of the main body, it is possible to mass-produce it in a factory in advance, and the cost of the product can be reduced. In addition, since it is only the connection work, the curing time of the concrete is not required, and it is possible to respond in a short time.

According to a second aspect of the present invention, a minimum slab of various standard dimensions of the precast concrete retaining wall main body having the bottom slab and the vertical wall according to the first aspect is manufactured in advance in a factory, and the bottom slab is added to the tip of the bottom slab of the main body. Both the extension panel and the vertical wall extension panel added to the upper end of the vertical wall are also prepared and prepared as a precast concrete member according to various standard dimensions at the factory. And connecting and using each of the ends of the main body with a connecting means to provide a precast concrete retaining wall.

As described above, the main body of the precast concrete retaining wall is factory-manufactured only for the minimum standard size, and each extension panel is factory-manufactured according to various standard sizes. Reduction can be realized more effectively.

A third aspect of the present invention is that a main body of a precast concrete retaining wall having a bottom slab and a vertical wall is factory-produced in advance, and a bottom slab extension panel to be added to a tip of the bottom slab of the main body is also provided.
The vertical wall extension panel added to the top of the vertical wall is also prepared as a precast concrete member by factory production according to various dimensions in advance, and only the tip of the bottom plate of the main body is added with the extension panel in advance. This is a method for constructing a precast concrete retaining wall, which is carried into a site, starts backfilling work, and adds an extension panel to an upper end of a vertical wall during the backfilling work.

Thus, only the tip of the bottom plate of the main body is
The extension panel is added to the site beforehand, and then carried into the site, and backfilling work is started. During the backfilling work, the extension panel is added to the top of the vertical wall to complete it. Since semi-finished products that have not been added can be delivered quickly and backfilling work can be started first, the construction period can be shortened.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment will be described as to how a concrete retaining wall construction method and a construction method using a precast concrete member according to the present invention are actually embodied. FIG. 1 is a cross-sectional view after construction using an L-shaped precast concrete retaining wall according to the present invention.

An L-shaped main body 3 is formed by the horizontal bottom plate 1 and the vertical wall 2. Inside, the reinforcing bar 4 is buried vertically and horizontally, and is manufactured by precasting. This L-shaped main body 3
Is preferably the smallest dimension in normal use. Moreover,
Since standard products can be mass-produced and have versatility, it is desirable to manufacture the minimum size of various standard products.

A horizontal extension panel 5 is previously added to the front end of the bottom plate 1 by a connecting means 6 at a factory. At the upper end of the vertical wall 2, an upward extension panel 7 for increasing the wall height is added by a connecting means 6. The extension panels 5 and 7 are manufactured in various sizes corresponding to various standard products, and are used by selecting from them according to the site.

Only when the height of the ground surface 9 after backfilling is high and the extension panel 7 is required, the extension panel 7 in the upward direction may be added, and the extension panel 5 of the bottom slab 1 is joined to maintain strength. Just add it.

If the height of the ground surface 9 after backfilling is low and the extension panels 7 and 5 are not required, it goes without saying that only the L-shaped main body 3 is sufficient.

According to the current standard, the dimension L of the bottom plate is 1750 m
m, 1900mm, 2050mm
Bottom plate 1 may be designed to have a minimum dimension of 1750 mm. At this time, the extension panel 5 is designed to have a size of 150 mm,
If it is added to the minimum size 1750mm bottom plate 1, it can be made 1900mm standard product. Also, if it is designed to be 300 mm in size and added to the bottom plate 1 of 1750 mm, which is the minimum size, it can be a standard product of 2050 mm, which is the maximum size.

The dimension H of the vertical wall is 2500 mm, 2750 mm, 3000
Since there are three types, mm, the vertical wall 2 of the L-shaped main body 3 may be designed to have a minimum dimension of 2500 mm. At this time, the extension panel 7 is designed to have a dimension of 250 mm and has a minimum dimension of 2500.
If it is added to the vertical wall 2 mm, it can be made a standard product of 2750 mm.
In addition, if it is designed to have a dimension of 500 mm and is added to a vertical wall 2 having a minimum dimension of 2500 mm, a standard product having a maximum dimension of 3000 mm can be obtained.

As described above, various sizes of the extension panels 5 and 7 are prepared in advance in accordance with various standards. If there are three types of standards, two types other than the minimum size may be prepared.

At the time of construction, the site is dug down into a place where a retaining wall is to be constructed as usual, and the foundation stone C, the foundation concrete B and the mortar A are laid in advance, and the L-shape with the extension panels 5 and 7 is provided. The main body 3 is placed on the mortar A in accordance with the ink marking position. Then, the backfill soil 8 is buried on the bottom slab 1 on which the extension panel 5 is added as described above.

If there is no waiting time for the precast concrete product due to the work at the site, in order to shorten the construction period at the site, the extension panel 5 is connected to the tip of the bottom plate 1 of the L-shaped main body 3 and the site is early. And carry on the installation work.

Then, when the construction is advanced and the extension panel 7 at the upper end is carried in and connected in the final step of the backfilling construction, and the final backfilling is performed up to the upper end of the extension panel 7, the construction is completed. Thus, the extension panel 7 at the upper end of the vertical wall 2
Need only be connected in the final step.

As described above, only the minimum dimensions of the precast concrete standard retaining wall composed of the L-shaped main body 3 are manufactured, and the extension panel 5 on the bottom slab side and the extension panel 7 on the vertical wall 2 side are various types. Precast manufacturing is performed according to the standard dimensions.

Then, in accordance with the construction drawing based on the on-site survey, the extension panels 5 and 7 of the optimal dimensions are connected to the bottom end of the bottom plate 1 and the upper end of the wall 2 of the L-shaped main body 3 by connecting fittings or the like. Carry in the site and start installation work.

If there is a delay in construction drawings or other delays, only the extension panel 5 at the tip of the bottom plate 1 of the L-shaped main body 3 is transported to the site in a state where it has been connected first, Proceed with installation work. As a result, there is no need to wait for retaining wall products. Alternatively, it can be shortened.

During the subsequent backfilling work, the extension panel 7 at the upper end of the vertical wall 2 is connected and backfilled to the upper end, thereby completing the work.

Further, according to the present invention, it is possible to promptly cope with a design change occurring during construction on site.
That is, when it is desired to increase the wall height of the retaining wall, it is sufficient to add the extension panels 5 and 7 having the optimal dimensions. Conversely, when the wall height is to be reduced, the extension panels 5 and 7 may be removed.

Therefore, the extension panels 5 and 7 do not always need to be connected at the factory, but may be connected at the site as needed.

FIG. 2 is a perspective view showing a first embodiment of the connecting means 6. In the case of FIG. 2A, mounting plates 10 and 11 are respectively buried on the inner surfaces of the vertical wall 2 and the extension panel 7, and are welded to the reinforcing bar 4 inside the concrete. That is, in a welded state, it is precast molded and embedded.

When connecting the extension panel 7, the connecting plate 12 is connected to the mounting plates 10, 1 by bolts and nuts 13.
1, the extension panel 7 is added to the upper end of the vertical wall 2.

In the case where the extension panel 5 is connected to the tip of the bottom plate 1 as in (2), the mounting plate 1 which is buried in advance and partially protrudes from the upper surfaces of the bottom plate 1 and the extension panel 5 is exactly the same.
The extension panel 5 is added to the bottom slab 1 by superimposing the connection plate 12 on 0 and 11 and fixing with the bolts and nuts 13.

The joint 14 between the bottom plate 1 and the vertical wall 2 and the extension panels 5 and 7 preferably has a step joint structure.

FIG. 3 shows various embodiments of the extension panel. In the case where the backfilled ground surface is a sloping ground, the extension panel connected to the upper end of the vertical wall 2 has a shape in which the upper edge is inclined like 7a. Precast molded.

FIGS. 4 to 6 show a case where the angle 15 is used as the connecting means 6, and the angle 15 shown in FIG.
Is placed on the surface of the extension panel as shown in FIG. 6 and fixed with bolts and nuts.

That is, as shown in FIG.
6 is embedded in a state where the inner end is welded to the inner reinforcing bar 4 and the outer end is welded to the flat plate 17. Therefore, with the bottom of the angle 15 superimposed on the flat plate 17 as shown in FIG. 6, the bolt 19 is screwed into the female screw hole of the long nut 16 from FIG. I do.

7 to 9 show an embodiment using a sleeve joint. 7 and 8, the bottom plate 1 and the vertical wall 2
The tip of the reinforcing bar 4 is inserted into one end of the sleeve joint 20. At the other end, the tip of the reinforcing bar 21 in the extension panels 5 and 7 is inserted. When the grout material is filled and hardened from one end of the sleeve joint 20 in a state where the reinforcing bars 4 and 21 are inserted from both ends of the sleeve joint 20, the reinforcing bars are connected to each other.

Therefore, as shown in FIG. 9, the tip of the reinforcing bar 21 is projected from the extension panels 5 and 7 so that it can be inserted into the sleeve joint 20.

Although three types of connection structures have been described above, the present invention is not limited to these three types of connection structures.

The present invention relates to a precast concrete retaining wall having a substantially right-angled bottom plate and a vertical wall.
It is needless to say that the present invention can be applied to all types of retaining walls such as a type, an inverted L type, an inverted T type, and a retaining wall type retaining wall.

[0041]

According to the method of the first aspect, the main body of the precast concrete retaining wall having the bottom slab and the vertical wall and the extension panels of various dimensions are produced in a factory in advance, and according to the situation at each site, Since each extension panel is selected and used after being added to each end of the main body, mass production can be performed in advance at a factory, and the cost of the product can be reduced. In addition, since it is only the connection work, the curing time of the concrete is not required, and it is possible to respond in a short time.

According to the method of the second aspect, the main body of the precast concrete retaining wall is factory-manufactured only for the minimum standard size, and each extension panel is factory-produced according to various standard sizes. Cost reduction by mass production can be realized more effectively.

According to a third aspect of the present invention, only the tip of the bottom plate of the main body is carried into the site with an extension panel added thereto in advance, and the backfilling work is started. The extension panel is added to the upper end of the wall, and the extension panel is not added to the upper end of the wall. The semi-finished product can be delivered promptly and the backfill work can be started first, so that the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view after construction using an L-shaped precast concrete retaining wall according to the present invention.

FIG. 2 is an enlarged perspective view showing a first embodiment of the connecting means.

FIG. 3 is a perspective view illustrating an extension panel according to the first embodiment.

FIG. 4 is a sectional view showing an embodiment of an L-shaped retaining wall connected by an angle.

FIG. 5 is an enlarged perspective view showing details of the angle connection structure of FIG. 4;

FIG. 6 is an enlarged perspective view showing a surface side of an embedded long nut.

FIG. 7 is a sectional view showing an embodiment of an L-shaped retaining wall connected by a sleeve joint.

FIG. 8 is an enlarged perspective view showing details of a connection structure using a sleeve joint.

FIG. 9 is a perspective view illustrating an extension panel connected by a sleeve joint.

[Explanation of symbols]

 Reference Signs List A mortar B foundation concrete C foundation stone 1 bottom plate 2 vertical wall 3 L-shaped main body 4 buried reinforcing bar 5 bottom panel extension panel 6 connecting means 7 vertical wall extension panel 9 ground surface 8 backfill soil 10,11 installation Plate 12 Connecting plate 13 Bolt / Nut 14 Seam 15 Angle 16 Long nut 17 Flat plate 18 Washer 19 Bolt 20 Sleeve joint 21 Reinforcing bar

Claims (3)

[Claims] 1. A precast concrete retaining wall body having a bottom slab and a vertical wall is preliminarily manufactured in a factory, and a bottom slab extension panel to be added to the tip of the bottom slab of the main body is also extended to an upper end of the vertical wall. Panels are also produced and prepared as precast concrete members at the factory, and according to the situation at each site, each of the extension panels is selected and added to each tip of the main body by connecting means and used. How to build a precast concrete retaining wall. 2. A precast concrete retaining wall main body having a bottom slab and a vertical wall is manufactured at a factory in advance with minimum dimensions of various standard dimensions, and a bottom slab extension panel to be added to a tip of the bottom slab of the main body is provided at an upper end of the vertical wall. The extension panel is also prepared as a precast concrete member by factory production according to various standard dimensions, and the extension panel is connected to each end of the main body according to the situation at each site. The method for constructing a precast concrete retaining wall according to claim 1, wherein the precast concrete retaining wall is used after being added. 3. A precast concrete retaining wall body having a bottom slab and a vertical wall is preliminarily manufactured in a factory, and a bottom slab extension panel to be added to the tip of the bottom slab of the main body is also extended at the upper end of the vertical wall. Panels are also factory-prepared and prepared according to various dimensions as precast concrete members.Only the tip of the bottom plate of the main body is transported to the site with extension panels added in advance, and backfilling work is started, A method for constructing a precast concrete retaining wall, characterized in that an extension panel is added to the upper end of a vertical wall during backfilling work.