JP2652143B2 - Upright retaining wall construction unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vertical
The present invention relates to a concrete block retaining wall construction unit used for constructing an upright retaining wall .

[0002]

2. Description of the Related Art Retaining wall design standards have been developed by various academic societies and various administrative organizations. However, installation costs may be omitted because the construction cost is higher than the effect obtained by consumers. Retaining walls are more likely to be overwhelmed than the housing itself, as construction methods are used to reduce the effective land area by making a steep slope.

[0003] In the conventional block-retaining wall, FIG.
As shown in the figure, the cavity for vertical bar placement and the recess for horizontal bar placement are both provided at the center on the midpoint of the depth dimension of the block, and the main bar is separated from the backside of the retaining wall Therefore, only a relatively small resistance moment can be obtained, and there is a problem that the workability is poor due to the heavy weight.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a retaining wall construction unit capable of appropriately constructing an upright retaining wall having a large resistance moment and an increased proof strength.

[0005]

The upright retaining wall construction unit of the present invention will be described below with reference numerals in the accompanying drawings. The unit is constructed of a rectangular parallelepiped 1 made of concrete, and a vertical reinforcing bar 2 is disposed thereon. Cavity 4 filled with 3
And a concave portion 6 in which the horizontal reinforcing bar 5 is arranged and filled with the concrete 3 is provided eccentrically to the rear side from the middle point of the thickness of the rectangular parallelepiped 1, and the rectangular parallelepiped 1 is perpendicular to the horizontal plane.
The vertical reinforcing bar 2 and the horizontal reinforcing bar 5 are
It is arranged to be deviated to the rear side from the intermediate point .

The unit shown in FIGS. 1 to 3 has a substantially rectangular elliptical large cavity 4 at the center of the rectangular parallelepiped 1 and semicircular hollows 4a and 4b at the left and right sides of the rectangular parallelepiped 1. This is a basic unit, and a deep concave portion 6 is provided on the upper surface of the rectangular parallelepiped 1, and the hollow portions 4, 4a, 4b and the concave portion 6 intersect.

The unit shown in FIG. 4 is a left corner type in which a substantially hollow elliptical cavity 4 is provided from the center to the left end of the rectangular parallelepiped 1 and a semicircular hollow 4b is provided on the right side of the rectangular parallelepiped 1. A deep concave portion 6 is provided on the upper surface of the rectangular parallelepiped 1, and the hollow portions 4 and 4 b intersect with the concave portion 6.

The unit shown in FIG. 5 is a right-corner type in which a substantially hollow elliptical cavity 4 is provided from the center to the right end of the rectangular parallelepiped 1 and a semicircular hollow 4a is provided on the left side of the rectangular parallelepiped 1. As a unit, a deep concave portion 6 is provided on the upper surface of the rectangular parallelepiped 1, and the hollow portions 4 and 4 a intersect with the concave portion 6. In these units, a vertical groove 7 and a vertical ridge 8 are provided on the left and right joint end faces, and by fitting the vertical groove 7 and the vertical ridge 8 between adjacent units,
We restrain sideways.

[0009]

[Function] In normal type, unit thickness is 180m
m, height is 150 mm, width is 400 mm
It is. In order to construct a retaining wall using this unit, as a preliminary work, perform territory according to the adjacent land boundary line, excavate the installation ground to a depth of about 70 cm according to the drawing,
The bottom plate is pressed flat using a rammer or the like. Cobblestones or crushed stones are laid on this, and the rammers are sufficiently transferred again to secure a thickness of 12 cm. After the split chestnut work is completed,
The discarded concrete is applied smoothly. The remains will be built vertically using a lumber of about 10 cm square using a plumb bob, and the top of the foundation and the ink of the unit allocation will be put out using the level.

The foundation position and the core of the retaining wall are printed on the upper surface of the discarded concrete, and the formwork is used on the front and rear surfaces of the foundation. Perform the basic arrangement according to the arrangement plan. The main reinforcement of the foundation is the main reinforcement position 1 from the lower part by the spacer block etc.
Secure 3 cm. Since the position of the vertical reinforcing bar 2 is the center of the hollow portion 4 of the unit, the reinforcing bars are arranged with care. When joints of reinforcing steel are provided in the foundation concrete, lap joints or gas pressure welding or arc welding shall be used. The upper portions of the vertical reinforcing bars are temporarily fixed to each other so that the vertical reinforcing bars do not tilt or are not disturbed at the time of driving.

When pouring concrete (ready-mixed concrete or in-situ concrete), the concrete is continuously driven in while being thrust well so as not to cause a cold joint. The spacing between the concrete injection holes is set to 2 m or less, and a scaffold is used so as not to step on the reinforcing steel. After driving, wait for the surface to be drained, tamping, and finish with a wooden iron. Provide appropriate curing according to the weather. After the concrete has sufficiently hardened, the formwork of the base concrete is carefully removed so as not to hinder the concrete and not to stain the surface on which the unit is assembled.

[0012] Ink marking is performed on the wall core and the wall surface by using the shape of the wall to confirm the position of the vertical reinforcing bar. The vertical rebar is designed to be 11 cm from the front and 7 cm from the back in the cavity of the unit. That is, a rectangular parallelepiped 1 (7) the thickness direction of the center line _{L 2} and the cavity 4,4a In FIG 1, 4b
The distance d between the center line L ₁ of which is set to 2 cm. The mixing ratio of the root adjustment mortar is 1: 2, and an appropriate pigment or admixture may be used for this. The first-stage units are assembled according to the black ink on the base surface. Confirm that the position of the vertical rebar is within about 2 cm from the center of the wall. For assembling, lay mortar on the face shell and web part on the foundation using a triangular iron, etc., and place it with the unit's web side down, and place the unit top horizontally with the water thread .

Next, the adjacent units are assembled in close contact with each other without attaching the vertical joint mortar. Laying mortar shall not be applied to more than one unit at a time. If a vertical bar is passed through the cavity in the center of the unit, the vertical bar must not be bent or bent. After stacking the first stage units, check the overall arrangement and level, etc.
Arrange horizontal rebar. The horizontal rebar is about 3cm from the top of the unit
At the lowered position, arrange the bars on the flute side and bind them together. The second-stage unit is assembled directly on the first-stage unit. The assembling is performed with the water thread aligned with the upper corner of the surface of the unit. When adjusting the horizontal and street of the unit, the adjustment mortar is thinned. 4
Drainage pipes will be installed after the steps. For this, a unit processed for drainage is used.

In principle, concrete is filled when the third and fourth stages are assembled and horizontal reinforcing bars are arranged. Filling is performed to the position where the third and fourth horizontal bars are hidden.
When the number of stacking units of the unit exceeds nine, the vertical reinforcing bar is used as a lap joint and before the concrete of the third to fourth stages is filled, the vertical reinforcing bar is dropped from the upper part of the unit to the foundation slab surface. The dropped vertical reinforcing bar is 11c from the front.
At the position of the fifth step, it is firmly bound to the main bar 10 rising from the foundation slab 9 so as to maintain the position of m. After confirming the position of all vertical reinforcing bars and the state of binding, concrete is filled to a position where the horizontal reinforcing bars in the third and fourth stages are hidden. A rod-shaped vibrator is used for filling, and the concrete is wrapped around the recess for the horizontal reinforcing bars.

The concrete filling of the fourth to fifth stages and thereafter is carried out every time four units of the unit are assembled. When using the Kasamoto unit on the top of the retaining wall, hit the center of the Kasamoto unit, insert a reinforcing bar of appropriate length where the hole has been penetrated, and fill with mortar to prevent slippage. .
The construction of this unit may be completed from the rooting to the top stage on the day and concreted and finished. In principle. In this case, the concrete pouring height is kept at about 50% of the height of the uppermost hollow portion.

After the concrete is sufficiently hardened, backfilling is performed. First, backfilling is performed while sufficiently squeezing to the second stage (lower ground surface) of the unit. Use good quality soil for backfilling. On the part in contact with the retaining wall, a permeable layer with a thickness of 30 cm or more is provided. Since the Kasagi unit does not bear the earth pressure, backfilling when using it is limited to the lower end of the Kasamoto unit.

[0017]

EXAMPLE A comparative test was carried out on the proof stress of a test piece made of a conventional block in which the cavity shown in FIG . 9 was not eccentric and a test piece made of the unit of the present invention. FIG.
As shown in the figure, the height of the upright retaining wall from the GL of each specimen was 1.95 m. Each specimen has the same cross section and the same reinforcing arrangement. The force method assumes one-way monotonic force assuming the earth pressure action at all times. As the applied position, a point where the ratio of the stress at the start point of the lap joint to the retaining wall leg coincides with the value in the design stress distribution, instead of the point of application of the earth pressure resultant force assumed at the time of design.

According to this experiment, the proof stress of the conventional block is 1.81 tm on average, whereas the unit of the present invention has an average of 2.18 tm and the allowable proof strength of 0.94 tm in the conventional block. On the other hand, the unit of the present invention is 1.11 tm, and the allowable proof stress ratio is 1.17 assuming that the conventional block is 1.
6 and eccentric the cavity position to reinforce the cuboid thickness
17.6 by deviating to the rear side from the midpoint of
% Proof stress was found to increase.

[0019]

As described above, according to the present invention, the unit for constructing an upright retaining wall is constituted by the rectangular parallelepiped 1 made of concrete, and the cavity 4 in which the vertical reinforcing bars 2 are arranged and the concrete 3 is filled.
And the concave portion 6 in which the horizontal reinforcing bar 5 is disposed and filled with the concrete 3 is eccentric to the rear side from the middle point of the thickness of the rectangular parallelepiped 1, and the rectangular parallelepiped 1 is vertically assembled with the horizontal plane.
When viewed, the vertical reinforcing bar 2 and the horizontal reinforcing bar 5 are in the thickness of the rectangular parallelepiped 1.
Since it is arranged deviated to the rear side from the intermediate point, the main reinforcement can be arranged closer to the back of the retaining wall without increasing the thickness than the conventional block, and a large resistance moment can be obtained, In addition, both the vertical cavity and the horizontal recess have a large volume, and the cover thickness of the concrete can be sufficiently ensured, so that a reinforced concrete structure retaining wall with enhanced strength can be constructed.

In addition, by making the cavity and the concave portion large, the weight is light for the thickness, and the assembling work can be easily performed. By improving the quality of the retaining wall for the retaining wall and raising the rectangular parallelepiped 1 vertically, it is possible to effectively use the land, and it is possible to construct with no form except for the form of the foundation slab. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a basic unit of a retaining wall construction unit of the present invention.

FIG. 2 is a left side view of the basic type unit.

FIG. 3 is a bottom view of the basic unit.

FIG. 4 is a plan view showing an example of a left corner type unit of the present invention.

FIG. 5 is a plan view showing an example of a right corner type unit of the present invention.

FIG. 6 is a right side view showing an example of a retaining wall constructed using the unit of the present invention.

FIG. 7 is a horizontal sectional view showing an example of a retaining wall constructed by the unit of the present invention.

FIG. 8 is a horizontal sectional view showing another example of the retaining wall constructed by the unit of the present invention.

FIG. 9 is a plan view of a conventional retaining wall construction block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete rectangular parallelepiped which comprises a unit 2 Vertical reinforcement 3 Filling concrete 4 Hollow part 5 Horizontal reinforcement 6 Depression 7 Vertical groove 8 Vertical protrusion

Claims (1)

(57) [Claims] 1. A rectangular parallelepiped 1 comprising a concrete rectangular parallelepiped 1 in which a vertical reinforcing bar 2 is arranged and filled with concrete 3 and a concave portion 6 in which a horizontal reinforcing bar 5 is arranged and filled with concrete 3 are formed. The cuboid 1 is provided eccentrically to the rear side from the midpoint of the thickness of
The vertical reinforcing bar 2 and the horizontal reinforcing bar 5 have the thickness of the rectangular parallelepiped 1
An upright retaining wall construction unit, wherein the unit is arranged so as to be deviated to the rear side from the intermediate point of the above .