JP2002256576A - Block structure of precast retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the efficiency of the respective blocks masonry is lowered by secondary construction work so that the cost increase is compelled. SOLUTION: A first projection part 29 abutting on the lower part of the front end face of an upper stacking block is provided along the cross direction on the top face of the front end part of each block 21, 21, and a second projection part 30 abutting on the top part of the rear end face of a lower block is provided on the lower surface of the rear end part. Each block 21 is provided with a void part 24 formed to vertically penetrate there, and both side opening parts 28, 28 facing on the void part are formed on both side walls 25, 26. A rear opening part 27 facing on the void part is formed in a rear end wall 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a block structure of a precast retaining wall.

[0002]

2. Description of the Related Art Various types of block structures for a precast retaining wall of this type have been conventionally proposed, and one of them is known, for example, from Japanese Patent No. 2920856.

[0005] Referring to FIG. 13, the block structure of the precast retaining wall includes a left and right side wall 3 of a block 1 having a cavity 2 penetrating vertically therein.
The width of 4 is set gradually smaller from the front end wall 7 to the rear end wall 8, and a concave portion 6 having a vertical rib 5 a and a horizontal rib 5 b is formed on each outer surface of the left and right side walls 3, 4. ing. Further, bulging portions 7a, 7b, 8a, 8 protruding laterally are provided on both sides of the front end wall 7 and the rear end wall 8 of the block 1, respectively.
b are provided respectively.

Further, each of the bulging portions 7a, 7b, 8a, 8
b, the upper and lower blocks 1, 1
Are formed, respectively, through which connection pin holes 9 and 10 through which connection pins (not shown) are inserted.

When the blocks 1 are vertically stacked, they are inserted into the connection pin holes 9 and 10 so as to straddle the connection pins, and the front and rear bulging portions 7a and
Each of the blocks 1 on both sides is connected to each other by placing a concrete body 11 as shown in FIG. 14 in a gap between the side walls 7a, 8a, 8b and the side walls adjacent to each other. As shown in FIG. 15, a core reinforcing bar 12 is buried in the concrete
Are connected to each other, thereby securing a strong connection.

[0006]

However, in the conventional block structure of the precast retaining wall, in order to stack and connect the respective blocks 1, besides using the connecting pins, as described above, the secondary is used. As a special operation, a concrete body 11 is cast on both sides of each block 1 and a core reinforcing bar 12 is embedded in the concrete part 11.

For this reason, such a series of operations becomes complicated, and the efficiency of stacking operation of each block 1 is significantly reduced.
Significant increases in operating costs have been forced.

[0008]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional technical problems, and the invention according to claim 1 has a structure in which a plurality of blocks are vertically stacked. In the block structure of the precast retaining wall constituting the retaining wall, a first projection is provided along a width direction on a front end side of an upper surface of each block, and the first projection hangs down from a rear edge of at least the first projection on a lower surface. A second protruding portion is provided on the rear end side from the position, and a lower concave front end surface of a stacked upper block is engaged with the first protruding portion, and a lower block is formed on the second protruding portion. Are sequentially stacked by engaging the stepped concave upper rear end surfaces.

Therefore, according to the present invention, in order to sequentially stack the respective blocks, the concave lower front end face of the upper block, that is, the upper block is placed while the lower surface of the upper block is placed on the upper surface of the lower block from above. When the concave front end surface in front of the second protrusion is lowered while abuttingly engaging with the rear surface of the first protrusion of the lower block, the front surface of the second protrusion of the upper block also moves from the predetermined lower position to the lower block. It descends while sliding on the upper portion of the rear end face, and the lower surface of the upper block abuts and engages with the upper surface of the lower block, and the lower block and the upper block are fitted via each projection.
Thereby, the positioning of the two blocks and the stable and reliable connection are performed.

The invention according to claim 2 is characterized in that the second protrusion is integrally provided along the width direction of the upper portion of the rear end face of the block.

The invention according to claim 3 is characterized in that a hollow portion vertically penetrating is formed in the block, and a front end of the hollow portion extends to an inner surface of a front end wall of the block.

The invention according to claim 4 is characterized in that both side walls of the block are formed with both side openings facing the cavity.

The invention according to claim 5 is characterized in that a rear opening facing the cavity is formed in a rear end wall of the block.

The invention according to claim 6 is characterized in that a front opening facing the cavity is formed in a front end wall of the block.

According to a seventh aspect of the present invention, a pin hole is formed in an upper portion of both side walls of the lower block, and a pin hole facing the pin hole of the lower block is formed in a lower portion of both side walls of the upper block. It is characterized in that a pin is inserted and arranged so as to straddle both pin holes.

The invention according to claim 8 is characterized in that the pin is formed in a tapered shape so as to have a maximum diameter from both ends of the minimum diameter toward the center.

According to a ninth aspect of the present invention, the length of the first protrusion in the front-rear direction is arbitrarily set, and the length of the second protrusion in the front-rear direction is set to the front-rear direction of the first protrusion. It is characterized in that it is set arbitrarily according to the length.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a block structure of a precast retaining wall according to the present invention.

That is, as shown in FIG. 1, a single block 21 made of concrete has a substantially box shape, a rectangular plate-shaped front end wall 22 at a front end, and a rectangular plate-shaped at a rear end. A hollow portion 24 having a rear end wall 23 and penetrating vertically in the center of the inside is formed.
Side wall 2 between the front and rear end walls 22 and 23 on both sides of
5, 26 are erected.

The rear end wall 23 has a rectangular opening 27 facing the cavity 24 at a substantially central position.
On the other hand, the side walls 25, 26 are formed with rectangular side openings 28, 28 facing the cavity 24 substantially at the center position, respectively, and the upper and lower cross beams 25a, 25b, 26a, respectively.
26b.

As shown in FIG. 1, a first projection 29 is integrally provided on the upper surface of the front end of the block 21 along the width direction. The second protrusion 30 is provided integrally along the width direction. Therefore, from the center of the first protrusion 29 and the upper cross beams 25a, 26a to the rear upper surfaces 25c, 26c.
, And between the second protrusion 30 and the lower cross beam 25b, 26
The lower surfaces 25d and 26d on the front side from the center of b are respectively concave in steps.

The first protrusions 29 are continuously provided on the upper surfaces of the front end walls 22 and the front ends of the upper cross beams 25a, 26a of the side walls 25, 26, and the length L in the front-rear direction is arbitrary. And the gradient of the entire front surface can be set freely according to the length L. In this embodiment, the gradient is set to about 1/3 of the entire length L2 of the block 21. . Also, the height H of the first protrusion 29 is arbitrarily set.

The second protrusions 30 are continuously provided on the lower surfaces of the rear end portions of the rear end walls 23 and the lower cross beams 25b, 26b of the side walls 25, 26, and have a length in the front-rear direction. L2 is determined relatively to the length L of the first protrusion 29, and is set to be substantially equal to each other.

Therefore, the cavity 24 is formed in the front end 2
4a is formed almost to the center of the first protrusion 29, and the rear end 24b is also formed almost to the center of the second protrusion 30.

As shown in FIG. 2 and FIG. 4, connecting pins 31 are provided at the front and rear ends of the upper and lower cross beams 25a and 26a and the lower cross beams 25b and 26b. Are respectively formed in the connecting pin holes 32 and 33 through which the holes are inserted. The connection pin 31 is, as shown in FIG.
The central portion 31a is set to have a maximum diameter and is formed in a tapered shape such that the diameter gradually decreases from the upper and lower ends 31b and 31c. On the other hand, the connection pin holes 32,
33 also has a tapered shape with a reduced diameter from the opening edge to the bottom side in accordance with the outer shape of the pin 31.

Therefore, according to this embodiment, in order to perform the work of stacking the blocks 21 at the construction site, first, the blocks 21 are sequentially stacked from the lower block 21 on a concrete base (not shown). As shown in FIG. 5 and FIG. 6, the upper block 21 previously held and suspended is lowered onto the upper surfaces of the upper cross beams 25a and 26a of the lower block 21 fixed and positioned. When the lower end of the front end wall 22 is lowered while abutting against the rear surface of the first protrusion 29 of the lower block 21, the second lower surface of the upper block 21 is moved from a predetermined lower position.
The front surface of the projection 30 descends while sliding on the upper end of the rear end surface of the lower block 21. Thereafter, the lower surface of the upper block 21 is placed on the upper surface of the lower block 21.

That is, the upper and lower blocks 21, 21 are:
The first projection 29 on the lower side and the second projection 30 on the upper side are relatively fitted to each other, that is, the positioning of the upper block 21 with respect to the lower block 21 by the regulating action of the upper and lower projections 29, 30. The connection is made.

In addition, the movement of the upper block 21 in the forward and downward directions can be reliably prevented by the restricting action of the projections 29 and 30.

As described above, since the upper and lower blocks 21, 21 can be connected stably and surely by the two projections 29, 30, the concrete body is cast between the blocks as in the above-mentioned prior art. And secondary work such as burying a guard bar there is no longer required. Therefore, the construction work efficiency can be greatly improved, the work cost can be reduced, and the raw material cost can be reduced.

The upper and lower blocks 21 as described above,
At the time of connection of 21, the upper half of the connection pin 31, the lower half of which has been inserted in advance into each connection hole 32 of the lower block 21, is inserted into each connection hole 33 of the upper block 21.
Therefore, the connection hole 3 facing the connection pin 31
2 and 33, the upper and lower blocks 21, 2
1 is performed, and the upper block 21
Can be reliably prevented from moving backward.

In addition to the cavity 24, the block 21 has openings 28, 28 in the side walls 25, 26 and the rear end wall 2 as well.
Since the third opening 27 is formed, the weight of the entire block 21 can be reduced. As a result, the connection workability of each block 21 is improved, and the heavy equipment for suspending the block 21 can be handled by a small and lightweight type.

During the work of stacking the upper and lower blocks 21, 21, the soil D is naturally placed in each of the blocks 21, 21.
Since sand and gravel are sequentially embedded, a sufficient weight is secured and each block 21 can be supported more stably.

In particular, since the openings 27 and 28 are formed, the fluidity of the water in each block 21 can be secured without providing a separate drainage mechanism, and the drainage can be improved. But costs can be reduced. In addition, since water can be stably supplied to plants, root blight can be prevented. As a result, greening is promoted,
The landscape becomes better.

Openings 28, 2 are formed in both side walls 25, 26.
8 is formed, as shown by the dashed line in FIG.
Since the scaffolding plate 34 can be bridged between the lower cross beams 25b and 26b, a stable scaffold can be secured, and the workability of construction is facilitated.

Further, the front end 24a of the cavity 24 is
Since the protrusions 29 are formed almost up to the center position, as shown in FIG. 6, the soil D in the hollow portion 24 is exposed upward from the front end portion 24a in a state where the blocks 21 are stacked. . Therefore, if a plant P is planted here, greening is promoted and the landscape is improved.

Further, by arbitrarily setting the length L of the first projection 29 as described above, the inclination of the front surface side can be freely changed, so that it can be applied to various construction places. . Further, the stacking layout of each block 21 can be freely set, and the upper block 21 is divided into two lower blocks 21 and 2 as shown in FIG.
In addition to stacking over one, it is also possible to freely select stacking vertically. Further, in addition to arranging the front surface of each block 21 so as to be linear as shown in FIG. 7, the front surface of each block 21 can be arranged so as to bulge forward as shown in FIG.
Conversely, they may be arranged so as to be curved inward.

FIGS. 9 and 10 show a second embodiment of the present invention. Each block 21 has a length L in the front-rear direction of the first projection 29 so that the front surface of each front end wall 22 is substantially vertical. ,
The length L3 of the lower surface 25d, 26d of the step block of the upper block 21 with which the first projection 29 is engaged is set to be substantially the same.

The length L of the second protrusion 30 in the front-rear direction
2 is arbitrarily set according to the overall longitudinal length L1 of each block 21.

Further, a substantially rectangular opening 35 facing the cavity 24 is formed substantially at the center of the front end wall 22 of each block 21.

Therefore, according to this embodiment, as shown in the figure, it is possible to stack the blocks 21 almost vertically in accordance with the topography, construction conditions and the like. For this reason, in addition to the operation and effect of the first embodiment, the degree of freedom of construction is further improved.

In addition, since the vegetation can be made using the opening 35 formed in each front end wall 22, the retaining wall can be greened. In addition, water in the ground is filled with the cutout window 35.
Therefore, drainage is improved, the generation of residual water in the ground inside the retaining wall is prevented, and the retaining wall can be stabilized.

Each block 2 of the second embodiment
11 and FIG. 12
As shown in the figure, it is also possible to arrange a base block 36 having a substantially triangular cross section below the lowermost block 21 and to stack the whole on the base block 36 with the upper side leaning backward. is there.

Therefore, the block structure of this embodiment can provide the same operation and effects as those of the second embodiment, and further improve the degree of freedom of stacking.

The present invention is not limited to the configuration of the above embodiment. For example, the length of the second protrusion 30 in the width direction can be set short, and the size and shape of the block are not limited. It can be changed freely according to the construction location.

[0045]

As is apparent from the above description, claim 1
According to the invention described in (1), the stacked upper and lower blocks can be connected stably and surely by the first and second projections. Or secondary work such as burying a guard bar there. Therefore,
Significant improvement of construction work efficiency and reduction of work cost can be achieved, and raw material cost can be reduced.

According to the second aspect of the invention, since the length of the second protrusion in the width direction is increased, the support rigidity of the upper block with respect to the lower block is increased, and more stable support can be obtained.

According to the third aspect of the present invention, the soil in the hollow portion is exposed from the front end in a state where the blocks are stacked, so that if plants or the like are planted here, greening is promoted and the landscape is enhanced. Becomes better.

According to the fourth aspect of the present invention, since the openings are formed in both side walls, the weight of the block can be reduced and the drainage can be improved.

According to the fifth aspect of the present invention, since the opening is also formed in the rear end wall, the weight of the block can be further reduced and the drainage can be further promoted.

According to the sixth aspect of the present invention, since the opening is also formed in the front end wall, even if the front end walls are vertically arranged in the stacking mode of the blocks, the opening is used. Therefore, vegetation can be promoted to promote greening.

According to the seventh aspect of the present invention, since the movement of the upper block can be more reliably prevented by the pins, a more stable connection state can be obtained.

According to the eighth aspect of the present invention, since the pin having the largest load has the unique shape with the maximum diameter at the center, the rigidity of the pin is increased, breakage is prevented, and durability is improved. As well as improving the connection strength between the upper and lower blocks.

According to the ninth aspect of the present invention, the inclination of the front side can be freely changed by changing the length of the first projection, so that it can be applied to various construction sites. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a block provided in a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of each block showing connection holes of upper and lower blocks.

FIG. 3 is a front view of a connection pin provided in the embodiment.

FIG. 4 is an essential part cross-sectional view showing a state in which a connection pin is inserted into each connection hole.

FIG. 5 is a sectional view showing a stacked state of each block.

FIG. 6 is an overall side view showing a stacked state of each block.

FIG. 7 is an overhead view showing a stacked state of each block.

FIG. 8 is an overhead view illustrating another stacked state of each block.

FIG. 9 is a side view showing a state in which blocks are stacked in the second embodiment.

FIG. 10 is an overhead view showing a stacked state of each block in the embodiment.

FIG. 11 is a side view showing a different stacking state of each block in the embodiment.

FIG. 12 is an overhead view showing a different stacking state of each block in the embodiment.

FIG. 13 is a perspective view showing a conventional block.

FIG. 14 is a plan view of conventional stacked blocks.

FIG. 15 is a side view showing a conventional stacked state of blocks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Block 22 ... Front end wall 23 ... Rear end wall 24 ... Cavity part 27 ... Rear end wall opening part 28 ... Side wall opening part 29 ... First projection part 30 ... Second projection part 35 ... Front end wall opening part

Claims (9)

[Claims] 1. A block structure of a precast retaining wall in which a plurality of blocks are stacked in a vertically mounted state to form a retaining wall, wherein a first projection is provided along a width direction on a front end side of an upper surface of each of the blocks. At the same time, a second protrusion is provided on the lower surface at least from a position hanging down from a rear end edge of the first protrusion to a rear end side, and a stepped lower front end of an upper block stacked on the first protrusion is provided. A block structure of the precast retaining wall, wherein the blocks are sequentially stacked while engaging the surfaces thereof, and engaging the upper rear end surfaces of the step recesses of the lower blocks with the second protrusions. 2. The block structure of a precast retaining wall according to claim 1, wherein the second protrusion is provided integrally along a width direction of an upper portion of a rear end face of the block. 3. The precast holder according to claim 1, wherein a vertical cavity is formed in the block, and a front end of the cavity extends to an inner surface of a front end wall of the block. Wall block structure. 4. A block structure for a precast retaining wall according to claim 3, wherein both side walls of said block are formed with both side openings facing said cavity. 5. The precast retaining wall block structure according to claim 3, wherein a rear opening facing the cavity is formed in a rear end wall of the block. 6. A block according to claim 3, wherein a front opening facing the cavity is formed in a front end wall of the block.
5. The block structure of the precast retaining wall according to any one of 5. 7. A pin hole is formed in an upper portion of both side walls of the lower block, and a pin hole facing the pin hole of the lower block is formed in a lower portion of both side walls of the upper block. The block structure of a precast retaining wall according to any one of claims 1 to 6, wherein a pin is inserted through the hole. 8. The block structure for a precast retaining wall according to claim 7, wherein said pin is formed in a tapered shape so as to have a maximum diameter from both ends of the minimum diameter toward the center. 9. The length of the first protrusion in the front-rear direction is arbitrarily set, and the length of the second protrusion in the front-rear direction is set corresponding to the length of the first protrusion in the front-rear direction. The block structure of a precast retaining wall according to any one of claims 1 to 8, wherein the block structure is arbitrarily set.