JP3231219U - Back formwork of retaining wall block corresponding to gentle slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back form of a retaining wall block capable of preventing a decrease in work efficiency of a retaining wall block construction work and shortening a construction period when constructing a retaining wall block on a slope with a gentle slope. SOLUTION: A front wall 11 is placed on an upper part of a back formwork 12 laid on the same horizontal plane on a gentle slope N, and concrete C is placed between the front wall 11 and the back formwork 12. It is a back formwork in the retaining wall block 10 of the kneaded structure to be constructed. The front wall 11 and the back formwork 12 are both formed of precast concrete, and the back formwork 12 is formed in a rectangular plate shape having a predetermined thickness. A plurality of positioning pin insertion holes were formed on the upper and lower contact surfaces of the back form 12s. [Selection diagram] Fig. 3

Description

The present invention relates to the back form of the retaining wall block, and more specifically, at the construction site of the retaining wall block, the back form of the retaining wall block installed on the slope of a gentle slope and the gentle slope using the back form. Regarding the construction method of the corresponding retaining wall block.

Conventionally, a retaining wall block made of precast concrete and having a kneaded structure is used to retain the slope of embankment or cut in a constructed land such as a road, a residential land, or a river embankment. In the construction of a retaining wall block having such a kneaded structure, first, a rear wall is erected in front of the slope at a predetermined interval parallel to the slope of the slope. Then, a crusher run (grain size crushed stone) is laid between the slope and the rear wall, and compacted by rolling. Next, the front wall of the retaining wall block is placed on the upper part of the foundation block laid on the ground in the lower part in front of the slope, and concrete is placed between the front wall and the rear wall. When the concrete hardens, the retaining wall block consisting of the front wall and the rear wall is placed on top of the retaining wall block, and the same work is repeated to raise the retaining wall block one step at a time along the slope of the slope. It is being built.

In the conventional retaining wall block construction work as described above, the work of rolling the crusher run between the slope and the rear wall and the work of placing concrete between the front wall and the rear wall of the retaining wall block are performed. When doing so, due to the rolling compaction of the crusher run and the pressure due to the placement of concrete, the connection between the foundation block and the retaining wall block placed on the top of this foundation block is misaligned, and it is built on the top of the foundation block. Retaining wall block may become unstable. For this reason, it is important to ensure the reliable connection of the retaining wall blocks placed on the upper part one by one to improve work efficiency and safety.

For this reason, a concave portion is formed on the upper surface of each block having a substantially parallelogram plate shape on the side surface, and a convex portion is formed on the lower surface of each block, and a plurality of blocks are formed as concave portions on the first stage block. By stacking the blocks so that the convex parts fit together and the front, back, and left and right sides of each block are almost the same plane, the on-site work when constructing the fore-edge wall is reduced, and the construction is completed in a short period of time. It is disclosed to realize what to do. (See Patent Document 1.)

Japanese Unexamined Patent Publication No. 2003-328375

The block of the fore-edge wall described in Patent Document 1 improves the efficiency of the end work of the retaining wall provided for the revetment of rivers and the stability of the ground on the road slope and the steep slope (slope). And safety can be improved.

However, the construction work of the retaining wall block as described above is to construct the retaining wall block on a slope (sloping surface) with a steep slope (for example, a slope of 3 to 5 minutes), and a gentle slope (for example). In the case of 10% (45 degrees) or less, when the retaining wall blocks are stacked, the load of the weight of the retaining wall blocks is more than the steep slope and is applied to the slope, so that the retaining wall blocks are likely to be unjustly submerged. It takes time to make the surface of the retaining wall block flush.

In addition, in the construction of retaining wall blocks on gentle slopes, old-fashioned retaining wall blocks may be constructed. That is, a crusher run (grain size crushed stone) is laid on the surface of a slope with a gentle slope, and the surface is compacted by rolling. Next, a veneer board for the formwork and a construction material for the back formwork are laid as the back formwork, and the retaining wall block is placed on the veneer board for the back formwork. Then, concrete (ready-mixed concrete) is placed between the retaining wall block and the back formwork, and after the concrete hardens, the back formwork is pulled out and collected each time, and this work is repeated on a gentle slope. The retaining wall block was being built.

Even in this case, since the formwork veneer plate used as the back formwork is, for example, a thin plate of 10 mm or less, the retaining wall block is unfairly submerged on the slope due to the load of the weight when the retaining wall block is placed. Not only does it take time to make the surface of the retaining wall block flush, but also the work of pulling out the veneer plate for the formwork is added, which may reduce the work efficiency of the construction of the retaining wall block and lead to an extension of the construction period.

In addition, the plywood for formwork used as the back formwork in the construction of the old-fashioned retaining wall block will rot over time if left in the ground as it is, so it was placed between the retaining wall block and the back formwork. After the concrete has hardened, the formwork veneer board is pulled out and collected each time, and the concrete adhering to the formwork veneer board is removed and then reused for the construction of the retaining wall block in the next stage. However, when the construction of the retaining wall block is completed, the veneer board for the formwork is not used at the construction site of the next retaining wall block and is discarded as industrial waste, so that extra cost for disposal is incurred.

In order to solve the above problems, the present invention can prevent a decrease in work efficiency of the construction of the retaining wall block and shorten the construction period when constructing the retaining wall block on a slope with a gentle slope. It is an object of the present invention to provide a back form of the above and a method of constructing a retaining wall block corresponding to a gentle slope using the back form.

In the present invention, the front wall is placed on the upper part of the back formwork laid on the same horizontal plane on a gentle slope, and concrete is cast between the front wall and the back formwork. In the retaining wall block of the stacking structure, both the front wall and the back formwork are formed of precast concrete, and in particular, the back formwork is formed in the shape of a rectangular plate having a predetermined thickness, and the upper and lower parts of the back formwork are contacted with each other. The back formwork of the retaining wall block characterized by forming insertion holes for a plurality of positioning pins on the contact surface and the holding wall block corresponding to a gentle slope using the back formwork were used.

In the present invention, the back formwork laid on the same horizontal plane on a gentle slope is formed of rectangular plate-shaped precast concrete having a predetermined thickness (for example, 30 mm). For this reason, when a back formwork is laid on the surface of a slope with a gentle slope that has been rolled by laying a crusher run (grain size crushed stone), and a front wall is placed on the upper part of the back formwork, the front It is possible to suppress the occurrence of unreasonable settlement on the slope due to the load of weight when the wall is placed as low as possible. Also, since the back formwork is made of precast concrete, it can be left in the ground as it is after placing concrete between the front wall and the back formwork, so it is an old-fashioned retaining wall on a gentle slope. Unlike the construction of blocks, the work of collecting (or discarding) the wooden formwork veneer board is not required, and the work efficiency can be improved.

Further, a plurality of positioning pin insertion holes are formed on the upper and lower contact surfaces of the back formwork. Then, since the back formwork is positioned and laid through a plurality of positioning pins, when the back formwork is continuously laid above, a step is formed due to unjust settlement between the back formwork. Can be prevented. This makes it possible to easily make fine adjustments when the surface of the front wall (retaining wall block) placed on the upper part of the back form is flush with each other.

That is, according to the back formwork of the retaining wall block corresponding to the gentle slope of the present invention and the construction method of the retaining wall block corresponding to the gentle slope using this back formwork, the retaining wall block is constructed on the slope of the gentle slope. It is possible to improve the work efficiency of the work and shorten the construction period.

It is a perspective view which shows the appearance of the retaining wall block which concerns on this embodiment. It is a side view explaining the construction method of the retaining wall block which concerns on this embodiment. It is a side view explaining the construction method of the retaining wall block which concerns on this embodiment. It is a side view explaining the construction state of the retaining wall block which concerns on this embodiment. It is a perspective view explaining the construction state of the retaining wall block which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following explanation, a small retaining wall block made of precast concrete is used for retaining the slope of a gentle slope in a land created by embankment or cut of roads, residential land, river embankments, etc. Construction along a gently sloping slope will be described as an example. FIG. 1 is a perspective view showing the appearance of the retaining wall block according to the present embodiment. 2 and 3 are side views illustrating a method of constructing a retaining wall block according to the present embodiment. FIG. 4 is a side view for explaining the construction state of the retaining wall block according to the present embodiment. FIG. 5 is a perspective view illustrating a construction state of the retaining wall block according to the present embodiment.

As shown in FIG. 1, the retaining wall block 10 of the present embodiment has an upper portion gently inclined rearward at a predetermined inclination angle (a gentle gradient of 10% (45 degrees) or less), and a decorative surface (a decorative surface (a gentle gradient of 10% (45 degrees) or less)) on the front surface. A rectangular (rectangular plate) front wall made of concrete (precast concrete) that has (not shown) and is integrally formed with two retaining walls 13 that project vertically from the rear surface of the front wall 11 to the rear. It is composed of 11 and a rectangular (rectangular flat plate) back form 12 made of concrete having substantially the same shape as the front wall 11 arranged in parallel to the rear of the front wall 11.

The size of the rectangular plate-shaped front wall 11 and the back form 12 is the size of the small retaining wall block 10, and as an example, the longitudinal direction (width) is 1230 mm and the lateral direction (height) is 390 mm. .. Further, the two retaining walls 13 are provided so as to project from both ends of the rear surface 11b of the front wall 11 in the horizontal direction toward the back form 12 side facing each other at equal intervals. The length of the two retaining walls 13 integrally formed with the front wall 11 (that is, the length to the rear) is a standard length (for example, 350 mm) defined by the small retaining wall block 10. Is.

In the present embodiment, the back form 12 is made of rectangular plate-shaped concrete having a predetermined thickness (for example, 30 mm). Then, as will be described in detail later, crushed stone (grain size crushed stone) is laid and laid on the surface of a gently sloping slope that has been compacted. In this way, by forming the back formwork 12 with rectangular plate-shaped concrete having a predetermined thickness (for example, 30 mm), the back formwork 12 is laid on the surface of a slope with a gentle slope, and then the back formwork 12 is laid on the upper part of the back formwork. Even when the wall 11 is placed, the unreasonable settlement of the back form 12 on the surface of the slope (rolled crusher run) due to the load of the weight of the front wall 11 can be suppressed as low as possible.

Further, on the upper and lower contact surfaces of the back form 12, a plurality of (two places) insertion holes 12a of the positioning pins 12b are formed at a predetermined distance from both ends of the rectangular plate shape in the lateral direction. .. When the back formwork 12 is laid one step at a time by inserting the positioning pin 12b into the insertion holes 12a of the plurality of (two places) positioning pin 12b to position and lay the back formwork 12 to each other. It is possible to prevent the formation of a step between the back form 12s. This makes it possible to easily make fine adjustments when the front surface of the front wall 11 mounted on the upper part of the back form 12 is flush with each other.

Hereinafter, with reference to FIGS. 2 to 5, the construction of the retaining wall block 10 of the present embodiment, that is, the construction of the retaining wall block 10 in the horizontal direction one step at a time will be described.

As shown in FIG. 2A, the foundation block 1 is buried in the ground G in front of the slope N on which the retaining wall block 10 is constructed. Then, a crusher run S is laid on the gentle slope N above the foundation block 1 and compacted toward the slope N side. Then, as shown in FIG. 2B, the first-stage back form 12 is laid on the surface of the crusher run S. Although it is a perspective view in the figure, the back formwork 12 is laid in a state where a plurality of back formwork 12s are in contact with each other in the horizontal direction in which the retaining wall block 10 is constructed, and the rectangular plate-shaped short sides of the back formwork 12 are in contact with each other. Ru.

Subsequently, as shown in FIG. 3A, the first-stage front wall 11 is placed on the upper portion of the first-stage back form 12. Although it is a perspective view in the figure, the front wall 11 is placed in a state where a plurality of pieces of the front wall 11 are in contact with each other in the horizontal direction in which the retaining wall block 10 is constructed, and the rectangular plate-shaped lateral sides of the front wall 11 are in contact with each other. .. Then, as shown in FIG. 3B, concrete (ready-mixed concrete) is placed between the front wall 11 and the back formwork 12. Then, when the concrete placed between the front wall 11 and the back form 12 is hardened, the back form 12 of the second retaining wall block 10 is held in the first stage as shown in FIG. 3 (b). Each is placed on the upper part of the back form 12 of the wall block 10.

At this time, on the upper surface of the back form 12 of the first stage (lower stage), an insertion hole 12a of a positioning pin 12b for positioning the mounting position of the lower surface of the back form 12 of the second stage to be placed on the upper portion is provided. It is formed in two places. On the lower surface of the upper back form 12 that comes into contact with the upper surface of the lower back form 12, a position that opposes the insertion hole 12a of the positioning pin 12b provided on the upper surface of the back form 12 of the lower retaining wall block 10. An insertion hole 12a for the positioning pin 12b is formed in the position. A positioning pin 12b (for example, a plastic connecting pin) is inserted into the insertion hole 12a of the upper and lower positioning pins 12b to position the laying position of the back form 12 of the upper and lower retaining wall blocks 10.

It is desirable that two or more insertion holes 12a for the positioning pins 12b provided on the upper and lower surfaces of the back form 12 are provided on the upper and lower surfaces of the back form 12. As a result, the insertion holes 12a provided on the upper and lower surfaces of the back form 12 are aligned via the plurality of positioning pins 12b, so that the back form 12 to be placed on the upper stage can be easily positioned. it can. Further, when the back formwork 12 is laid one step at a time, it is possible to prevent the formation of a step between the back formwork 12.

By repeating the steps shown in FIGS. 2 and 3 in this way, as shown in FIG. 4, the retaining wall blocks 10 having a plurality of steps (6 steps in the figure) one step upward along the slope N of the gentle slope. Is built on the surface of the slope N with a gentle slope. As shown in FIG. 4, a concrete road shoulder block 2 that protects the road shoulder of the slope N is placed and fixed on the upper portion of the uppermost retaining wall block 10.

Then, as shown in FIG. 5, a retaining wall block 10 is installed on the construction surface extending from the upper end to the lower end of the slope N having a gentle slope to be retained so as to prevent the slope N from collapsing due to rainwater or the like. At this time, the first-stage front wall 11 and the second-stage front wall 11 installed above the first-stage front wall 11 are installed so that their longitudinal contact surfaces do not overlap in the vertical direction of the slope N. That is, as shown in FIG. 5, by disposing the front wall 11a having a length substantially half in the longitudinal direction at both ends of the first-stage front wall 11 in the horizontal direction, the front wall 11 abuts in the longitudinal direction. The surfaces do not overlap in a straight line in the vertical direction.

In this way, by arranging the front wall 11a having a length substantially half in the longitudinal direction for each step, the front wall 11 is installed on the entire surface from the upper end to the lower end of the slope N having a gentle slope. It is possible to prevent the contact surfaces in the longitudinal direction from overlapping in a straight line in the vertical direction. As a result, the seismic resistance of the retaining wall block 10 against vertical vibrations such as an earthquake is improved, and the retaining wall block 10 that does not easily collapse due to vertical vibrations such as an earthquake can be obtained.

As described above, according to the method of constructing the retaining wall block using the back formwork 12 of the present embodiment, it is possible to improve the work efficiency of the retaining wall block construction work on the slope of a gentle slope. It is possible to shorten the construction period.

Further, in the above-described embodiment, the retaining wall block 10 having the front wall 11 and the back formwork 12 whose upper portion is inclined rearward at a predetermined inclination angle (gentle inclination) has been described as an example. , The angle may be any angle corresponding to the inclination angle of the slope N.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiment, and various modifications are made within the scope of the gist of the present invention described in the claims.・ Can be changed.

1 Foundation block 2 Road shoulder block 10 Retaining wall block 11 Front wall 12 Back formwork 12a Insertion hole 12b Positioning pin 13 Retaining wall G Ground N Slope S Crasher run C Concrete

This invention relates to a back mold retaining wall blocks, specifically, in the construction site of the retaining wall block, about the back mold retaining wall blocks facility slope of low gradient.

In order to solve the above problems, the present invention can prevent a decrease in work efficiency of the construction of the retaining wall block and shorten the construction period when constructing the retaining wall block on a slope with a gentle slope. The purpose is to provide a back formwork for.

In the present invention, the front wall is placed on the upper part of the back formwork laid on the same horizontal plane on a gentle slope, and concrete is cast between the front wall and the back formwork. In the retaining wall block of the stacking structure, both the front wall and the back formwork are formed of precast concrete, and in particular, the back formwork is formed in a rectangular plate shape having a predetermined thickness, and the upper and lower parts of the back formwork are hit with each other. the contact surface and a back mold in the slow gradient corresponding retaining wall blocks you characterized by forming the insertion hole of the plurality of positioning pins.

That is, according to the back formwork of the retaining wall block corresponding to the gentle slope of the present invention, it is possible to improve the work efficiency of the retaining wall block construction work on the slope of the gentle slope, and shorten the construction period. Is possible.

Claims (1)

Retaining wall of a kneading structure constructed by placing the front wall on the upper part of the back formwork laid on the same horizontal plane on a gentle slope and placing concrete between the front wall and the back formwork. In the wall block
Both the front wall and the back formwork are formed of precast concrete, and in particular, the back formwork is formed in the shape of a rectangular plate having a predetermined thickness, and a plurality of positioning pins are formed on the upper and lower contact surfaces of the back formwork. A back form of a retaining wall block characterized by forming an insertion hole of the above, and a method of constructing a retaining wall block corresponding to a gentle gradient using this back form.

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