JP4520630B2 - Stepped seam forming block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stepped seam forming block capable of strengthening retaining wall strength, earthquake resistance, durability and the like, particularly when used to construct a block stack retaining wall.
[0002]
[Prior art]
The leaning retaining wall is a structure that stabilizes the retaining wall load by acting on the slope. In the past, leaning type retaining walls have been made by concrete casting. A leaning type retaining wall is formed even if concrete placement and solidification are repeated in the height direction. In consideration of the strength, seismic resistance, durability, etc. of the retaining wall in this case, the Ministry of Construction established the civil engineering structure standard design, and formed a mold for stepping between the main molds. As shown in FIG. 4, a step 5 of the cast concrete 6 is provided at the joint 4 between the front surface 1 and the back surface 2. In addition, although the code | symbol 3 may not be arrange | positioned depending on construction specifications, when it arrange | positions, it has shown steel materials, such as one or several reinforcing bars.
[0003]
Recently, a block product method that does not require a formwork and has a short construction period has been adopted due to the necessity of a formwork or a long construction period (for example, Japanese Patent Laid-Open No. 08-218401).
[0004]
[Problems to be solved by the invention]
In the case of this block product method, the upper and lower blocks are pinned, the block is prevented from being displaced by a concave-convex joint, or the block is locked to the reinforcing bar provided on the back (for example, actual No. 01-041784) Although there is a technique to deal with block misalignment, etc., there is no such thing as adding a step in consideration of earthquake resistance etc. at the joint of the embedded concrete continuously in the vertical direction. In view of this, the present invention has examined the provision of a block capable of providing a step between the natural joint and the concrete joint with the placement of the embedded concrete.
[0005]
[Means for Solving the Problems]
Result of studying the above problems, in the front and rear walls and to build a retaining wall constructed bridging a plurality of beams in a block, there is a height difference in the back and forth, the conditioned hooked stage engages each other in the front-rear direction It is formed on the upper and lower edges of the beam, and the step forming plate is bridged over the keyed stepped vertical part of the upper edge of the beam, and the concrete is applied to the upper part of the step forming plate on the front wall side from the step forming plate. A stepped joint forming block is formed in which a step is formed at the joint sandwiching the step forming plate by placing the concrete on the rear wall side of the step forming plate near the lower portion of the step forming plate . The block that constructs the retaining wall here has a shape having a plurality of beams connecting the front wall and the rear wall, a box shape, a rectangle, and a polygon in a side view, Blocks such as rhombuses, parallelograms, trapezoids, and the like, in which the front wall or the rear wall forms a retaining wall such as a vertical wall, an inclined surface, or a curved surface, are included .
[0006]
In addition, similar blocks, the convex portion with a partially height difference at the upper edge of the beam, the recess in which the protrusion is fitted is formed respectively on the lower edge of the beam, vertical longitudinal plane of the beam A step-forming plate is placed in the middle of the plate, and the concrete is placed near the top of the step-forming plate on the front wall side from the step-forming plate, and the concrete is placed near the bottom of the step-forming plate on the rear wall side from the step forming plate. by it may be a stepped punch seaming block to form a step on striking seam to sandwich the step forming plate. In this case , the step forming plate is provided between the upper edge and the lower edge of the beam by spanning the vertical surface of the beam .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a stepped seam forming block according to an embodiment of the present invention. FIG. 2 is a perspective view of the main part of the retaining wall in the construction process using the block. 3 is a cross-sectional view taken along the line AA in FIG. The stepped seam forming block 10 shown in this example is constituted by a front wall 11, a rear wall 12 and two substantially parallel beams 13 and 13. The beam 13 has a through hole 14 that maintains the continuity of the embedded concrete. In the block in which this retaining wall can be constructed, the upper and lower edges of the beam 13 of the block have height differences in the front and rear, and key-like stepped portions 7 and 8 that are hooked in the front-rear direction are formed. . A step forming plate 15 is bridged over the vertical portion of the key-like step 7 on the upper edge of the beams 13 and 13 . The step forming plate 15 has a flat plate shape obliquely or vertically, and is provided with a width (height) sufficient to add a step 5 to the joint 4 of the concrete 6. The shapes of the key-shaped steps 7 and 8 and the step-forming plate 15 are arbitrary, and may be provided in two or three steps.
[0008]
The state of the retaining wall in the construction process using this stepped joint forming block can be seen in FIG. 2 and FIG. 3, but the joint 4a and step 5a of the cast concrete 6a generated when the lower block 10a is stacked. The upper block 10b is placed on the lower block 10a so that the upper step 10b of the upper block 10b is hooked from the rear to the key step 7a of the lower block 10a. By placing concrete 6 near the top of the step forming plate 15 on the front wall 11 side from the forming plate 15 and placing concrete 6 near the bottom of the step forming plate 15 on the rear wall 12 side from the step forming plate 15 , Ru to form a step 5b to hit seam 4b sandwiching the step forming plate 15. A step 5 is naturally formed in each joining process of the embedded concrete 6 that is continuous above and below the retaining wall. As in this embodiment, the upper and lower edges of the beam 13 have a difference in height in the front and back, and if the key-like stepped portions 7 and 8 that are hooked in the front-rear direction are formed, it can also serve as a displacement stop during construction. it can. Although not shown in the figure, when the step forming plate 15 is provided so as to protrude above the cast concrete, the lower part of the insert concrete placed in the upper stage reaches the lower block, and is further seismic resistant at the joint. It is possible to add an effective step to the like.
[0009]
4 to 7 show a stepped joint forming block according to another embodiment of the present invention. FIG. 4 is a plan view, FIG. 5 is a perspective view, and FIG. It is a principal part perspective view of a wall. 7 is a cross-sectional view taken along the line BB in FIG. In this example, a step-forming plate is bridged between the front wall 11 and the rear wall 12 (near the middle of the reserved length) between the top and bottom of the block, that is , in the middle of the vertical surface of the beam, and beams 13 and 13 are used Thus, a step forming plate 15 is provided. On the upper edge of the beams 13, 13, there is a convex part 16 with a difference in height, and on the lower edge , a concave part 17 into which the convex part is fitted is provided. These have an engagement relationship in the front-rear direction between the upper and lower blocks, and exhibit a displacement-preventing action.
[0010]
The state of the retaining wall in the construction process using the stepped seam forming block 10 is shown in FIGS. When the lower block 10a is stacked, the concrete 6a is placed on the joint 4a and the step 5a, and the concrete 6b is placed as an insert in the upper block 10b, and the joint 4b and the step 5b are formed on the upper surface. Yes. In this example, concrete is placed up to the upper part of the step forming plate 15 on the front wall 11 side from the step forming plate 15 inside the stepped joint forming block, and the step forming plate 15 on the rear wall 12 side from the step forming plate 15. By placing the concrete up to the vicinity of the lower part of the metal, a step 5 can be formed in each jointing process of the embedded concrete 6 that is continuous up and down.
[0011]
【The invention's effect】
The stepped joint forming block according to the present invention can provide a step in the concrete joint accompanying the placement of the embedded concrete behind the front wall. Therefore, it has become possible to improve retaining wall strength such as earth pressure resistance, earthquake resistance, and durability.
[Brief description of the drawings]
FIG. 1 is a perspective view of a stepped seam forming block according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part of a retaining wall in the construction process using the block.
FIG. 3 is a cross-sectional view taken along AA in FIG.
FIG. 4 is a plan view of a stepped seam forming block according to another embodiment.
FIG. 5 is a perspective view of the stepped seam forming block.
FIG. 6 is a perspective view of a main part of a retaining wall in the construction process using the block.
7 is a cross-sectional view taken along the line BB in FIG.
FIG. 8 is a cross-sectional view showing a state of stepping of a conventional concrete leaning type retaining wall.
[Explanation of symbols]
1 Surface 2 Back 3 Reinforcement 4 Joint 5 Step 6 Concrete
7 Key step on the upper edge
8 Key step on the lower edge
10 Stepped seam forming block
11 Front wall
12 Rear wall
13 Beam
14 Through hole
15 Level difference plate
16 Convex
17 Recess

Claims (2)

In block to build a composed retaining wall by bridging a plurality of beams in the front and rear walls,
There is a difference in height in the front and back, and a key-like step with hooks in the front-rear direction is formed on each of the upper and lower edges of the beam, and a step-forming plate is bridged on the vertical part of the upper edge of the beam ,
Placing concrete near the top of the step forming plate on the front wall side of the step forming plate, and placing concrete on the back wall side near the lower portion of the step forming plate, sandwiching the step forming plate. A stepped seam forming block that forms a step at the seam. In block to build a composed retaining wall by bridging a plurality of beams in the front and rear walls,
A convex part with a difference in height is formed on the upper edge of the beam, a concave part where the convex part fits is formed on the lower edge of the beam, and a step forming plate is installed in the middle of the vertical surface of the beam. Hand over,
Placing concrete near the top of the step forming plate on the front wall side of the step forming plate, and placing concrete on the back wall side near the lower portion of the step forming plate, sandwiching the step forming plate. A stepped seam forming block that forms a step at the seam.

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