JPH038927A - Construction of block retaining wall and retaining wall block - Google Patents

Abstract

PURPOSE:To construct a stabilized retaining wall having excellent earth pressure yielding strength by arranging precast blocks having bearing stays extending to the rears of sheathing plates so as to stride over reinforcements provided on the foundation ground to fill hardening materials into a lower space. CONSTITUTION:A retaining wall block A standing by itself at two points of the lower end 11 of sheathing plates 1 of the retaining wall block forming a retaining wall surface on the surface thereof and having injection holes 21 by projecting bearing stays 2 to the rear and a stay tail end 22 is precasted. After that, a site subject to construction is readjusted to construct a foundation line G, and reinforcements M are arranged so as to stride over the inside of a space section 3 to stand the retaining wall blocks A in a line. The blocks are coupled with each other, the legs are solidified with concrete, and concrete P, etc., are poured into the space section 3 from the injection holes 21 to harden. According to the constitution, yielding strength against earth pressure from a banking side is strengthened rationally, and a break-down or fall-down of the retaining wall can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction method for a block retaining wall that is constructed in conjunction with construction work such as embankment or embankment, and a retaining wall block used in the construction method.

[Prior Art] Conventionally, in the construction of this type of block retaining wall, an L-shaped linear wall block with a supporting retainer that extends rearward at a right or acute angle from the lower end of the earth retaining plate is used, and this is used as a foundation stone or This method involves backfilling after connecting and fixing adjacent blocks with connecting bolts or spades in parallel to the construction foundation line, which has been leveled with leveled concrete and adjusting mortar.

However, even if mortar for leveling unevenness is laid on leveled concrete, it is nearly impossible to lay the mortar on the entire supporting surface at a uniform level and density during on-site construction.

[Problems to be Solved by the Invention] In conventional wedge-shaped retaining wall blocks, the bottom surface of the support retainer is entirely on the ground, so it is extremely difficult to adjust the height and position to align the surface slope of the retaining slab, and the installation direction of the top surface of the retaining slab is extremely difficult. If you try to align the streets in a straight line, one of the upper surfaces of the support restraints will be facing upwards, and one will be flat, creating a step, making it difficult to line up the entire street. Even if you use adjustment mortar, you cannot finish the top surface completely horizontally, so either level the edge of a piece of wood and insert it into the gap between the concrete and the supporting backing, or fill only a part of the supporting backing with mortar. The work requires skill, such as land leveling and laying.

In addition, if the overhanging angle of the support retaining is obtuse, the earth pressure exerted against the earth retaining slab from the mound side will be dispersed by the back of the retaining slab and the top surface of the retaining retaining holding the retaining slab respectively. If the overhanging angle of the retainer is at a right angle, all of the earth pressure will be applied to the back side of the retaining block, and if the overhanging angle is acute, the bottom surface of the retaining retainer will also receive earth pressure, increasing the forward collapse pressure of the retaining retainer.

In the case of an L-shaped retaining wall block, if the overhanging angle of the support retainer is made obtuse, the block will not stand on its own without auxiliary materials, so the overhanging angle must be made acute, and the pressure resistance of the block will be sacrificed accordingly. The problem was that it had to be done.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention makes the support retainer protrude rearward at an angle from the back side of the earth retaining plate instead of from the lower end thereof, or as needed. By bending it from the middle and configuring it in a cross-sectional shape, the earth retaining slab was supported at the slope angle of the built retaining wall at the butt end that touches the ground.

Furthermore, the drawbacks of the conventional method are overcome by providing a gap between the leveling concrete and the leveling concrete at the lower part of the supporting support and filling it with filler concrete or mortar.

Furthermore, depending on the load and soil conditions, the base of the retaining wall block may be fixed by inserting anchor reinforcing bars into the leveled concrete and filling it with hardening material such as concrete or mortar.

[Function] The end of the support retainer that extends backward from the back of the retaining block is
The retaining wall block is grounded together with the lower end of the earth retaining slab to stand on its own like a stool. Both the lower end and the butt end of the earth retaining block have a small ground contact area and are linear, so by holding the upper end of the earth retaining plate and shaking it, it is possible to adjust the ground contact surface and positional deviation. In the case of the L-type, the entire bottom surface of the support backing is grounded, so it is difficult to fix the grounding part to concrete, but in the case of the present invention, it is possible to fix the concrete with two points of grounding in the form of a stool, and the reinforcement and support backing can be fixed to concrete. An extremely strong concrete fixation can be achieved by providing injection holes in the concrete.

In addition, it has stable independence due to two-point grounding, and since the area of the contact surface with the adjacent block is large, there is little misalignment of the connecting portion when they are lined up side by side.

In the case of the block retaining wall according to the present invention, the earth pressure from the top of the embankment is distributed to the back surface of the earth retaining slab and the top surface of the support backing, but in the case of an L-shaped block retaining wall, it is distributed to the bottom surface of the support backing. S
There is also room for earth pressure to be applied to the structure, and the yield strength will be weaker than that of the present invention.

[Example] The present invention will be described in detail below with reference to the drawings.

l is a precast retaining wall concrete block earth retaining plate, and the surface constitutes the retaining wall surface. The support retainer 2 protrudes rearward at an angle from the back and bends in the middle to enlarge the cavity 3. Of course, it is also possible to extend the support retainer in a large size without making any bends in the middle.

Setting the projecting angle α to 105' to 108° is efficient for Tonosho. An injection hole 21 is provided in the supporting support 2, and after the foundation is fixed, a hardening material such as concrete is injected to fix the blocks and strengthen the retaining wall. Since the block stands on its own like a stool by touching the ground at two points, the lower end 11 and the butt end 22 of the retaining block 1, it can be easily placed on the construction foundation line and its position can be easily adjusted.

A block retaining wall is constructed using the retaining wall blocks constructed in this manner. First, the site to be constructed is leveled with chestnut stone and foundation concrete, and a foundation line G is created. Reinforcing bars M are placed in advance on the foundation line during ground leveling, and the retaining wall blocks A are arranged in parallel with the reinforcing bars straddling the void 3. If necessary, spread gravel, mortar, etc. on the foundation line G to make it easier to adjust the position of the retaining wall blocks. After adjusting the level and surface slope of the parallel retaining wall blocks, connect the adjacent blocks with connecting bolts, etc., or solidify the legs of the blocks with concrete, and then insert the injection hole 21.
A hardening material such as concrete is injected into the empty space 3 to fill it up, and the foundation of the retaining wall block including the reinforcing bars M is completely hardened. After the concrete hardens, the remaining soil is backfilled to complete the construction of the block retaining wall.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to easily construct a block retaining wall whose resistance to earth pressure from the heap side is reasonably strengthened and whose foundation is securely fixed. This invention is extremely useful in preventing collapses and retaining walls that often occur during residential development.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall perspective view showing the implementation status of the construction method, Fig. 2 is a vertical sectional side view showing the structure of a block retaining wall, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a side view of the retaining wall block according to the embodiment, FIG. 4 is a plan view of the same retaining wall block, and FIG. 5 is a longitudinal sectional side view showing the construction structure of a block retaining wall using L-shaped retaining wall blocks. 1 - Retaining plate 11 - Lower end of earth retaining plate 2 - Support retaining 21 - Injection hole 22 - Retaining end 3 - Support upper and lower gaps A - Retaining wall block G - Construction foundation line M - Reinforcing bars N - Leveled concrete P Filled concrete Q～～Stone foundation L-
L-type retaining wall block S-Support bottom surface of L-type retaining wall block W~Remaining earth α~Protrusion angle of support retainer Fig. 4rIIJ 152- Fig. 5''

Claims (4)

[Claims] (1) Place reinforcing bars along the foundation line on the foundation ground for constructing a retaining wall, and extend them backwards at an angle from the back of the retaining slab.
Precast blocks equipped with support supports that support the earth retaining slab at the slope angle of the constructed retaining wall at the butt ends that touch the ground are installed in parallel so as to straddle the installed reinforcing bars, and the earth retaining slab and support retainers are arranged to straddle. A method for constructing a block retaining wall characterized by constructing a retaining wall foundation by filling a hardening material into the void in the support lower part containing reinforcing bars. (2) Retaining wall block equipped with a support retainer that supports the retaining slab at the slope angle of the constructed retaining wall with the retaining end that extends rearward from the back of the retaining slab and touches the ground. (3) Claim (2) in which the width of the support retainer is made the same as the width of the retaining block, and an injection hole for filling the hardening material is provided in the support retainer.
Retaining wall block as described (4) The retaining wall block according to claims (2) and (3), in which the angle of the support retaining projecting from the back surface of the retaining plate is an obtuse angle.