JP2004316272A - Retaining wall construction method for widening road and concrete stacking block used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a firm retaining wall formation body in which columns and beams are connected almost vertically, a cavity is formed in the inside, and concrete, reinforcements, PC steel bars, or their combined materials are put therein and unified together. <P>SOLUTION: In the retaining wall construction method for a widened road, a plurality of stages of concrete stacking blocks having buttresses connecting to at least the front walls are used. The gradient of slope of the front wall is 20%-substantially perpendicular posture. Concrete, reinforcements, or civil engineering materials of soil and sand, etc. are filled inside the buttresses. In the construction method, a plurality of pieces of concrete stacking blocks having beam-columns rising at a steep inclination from the front wall are stacked toward the front wall above from a specified stage while the inclination of the front wall is kept as it is, to form the beam-column in a substantially vertically connected state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, when forming the widening of the road in the mountains, etc., from the gentle slope of the front wall is about 20% to the upper part of the concrete retaining wall between substantially vertical, simultaneously and easily with the widening of the road, In addition, the present invention relates to an economical construction method of a retaining wall and a concrete masonry block for widening a road having columns and beams used for the method.
[0002]
[Prior art]
As a conventional method of widening a road when forming a road in a mountain area or the like, there is a method in which an overhanging sidewalk block is formed on the uppermost stage in which a plurality of retaining wall blocks are stacked (for example, see Patent Document 1). ). There is also a block which provides an effective use area expansion block which can form an expanded space above the inclined surface of the retaining wall without requiring any processing on the retaining wall (for example, Patent Reference 2). Further, there is a road retaining wall structure using a plurality of divided skeletons made of a concrete molded product (for example, see Patent Document 3).
[0003]
[Patent Document 1] Japanese Utility Model Registration No. 2518265 (page 1, FIG. 1)
[Patent Document 2] Japanese Patent Application Laid-Open No. 8-85552 (page 1, FIG. 1)
[Patent Document 3] Japanese Patent Application Laid-Open No. 2002-38498 (page 1, FIG. 5)
[0004]
[Problems to be solved by the invention]
However, many conventional road widening methods have a structure in which an overhang is attached to the top of a normal concrete retaining wall as in the examples of Patent Literature 1 and Patent Literature 2, and have a large wheel load such as a large truck. Or the structure where the overhanging portion and the retaining wall body are not sufficiently integrated and unstable. In addition, since a large bending moment is generated at the base of the overhang portion, a thick and large member is required, resulting in an uneconomical structure. Furthermore, since the overhanging portion and the lower retaining wall are constructed separately, a long construction period is required, and it cannot be said that this is an economical construction method. Also, as in Patent Document 3, there is a structure in which a plurality of divided skeletons made of a concrete molded product are integrated and constructed, but since the interior of the molded product is hollow, there is a possibility that it cannot withstand general earth pressure. Was. Conventional known construction methods have the above-mentioned difficulties.
[0005]
[Means for Solving the Problems]
In order to solve these problems, the inventor uses a plurality of concrete stacking blocks having at least a front wall and a retaining wall connecting the front wall, and the front wall has a normal gradient of about 20% (1: 2.0). In the construction method of the retaining wall which is located between the gentle slope and the substantially vertical, and fills the inside of the retaining wall with concrete, reinforcing steel, or earth and sand or other civil engineering material, the front wall has the same slope and rises from a predetermined step. A road widening retaining wall construction method characterized by stacking a plurality of concrete building blocks having columns and beams rising in front of the front wall at a steeper gradient than the front walls, and making the columns and beams substantially continuous in a vertical direction. Was developed. Concrete, steel bars, PC steel rods, or a combination thereof are put into the interior of the column-beams that are substantially vertically connected.
[0006]
According to the present invention, even when a large wheel load such as a large truck is applied from above, a compressive force acts on the column and beam, so that unlike the structure of the normal overhang portion, a large bending moment does not occur, and the most economical structure can be obtained. Can be. In addition, since the pillars and beams are constructed simultaneously with the construction of the ordinary concrete block retaining wall, the construction is fast and economical.
[0007]
In the column beam of the present invention, the normal gradient of the front wall is between the 20% gradient and substantially vertical. If the slope is steeper than the front wall, it may be vertical as shown in FIG. 2 described later, may be gentler than vertical as shown in FIG. 16, or may be steeper than vertical as shown in FIG.
[0008]
Since concrete and reinforcing bars are filled and inserted inside the retaining wall of the concrete building block retaining wall, the concrete building block is completely integrated to provide a solid retaining wall frame.
[0009]
If one or more pillars are provided in the front wall and rise at a steeper gradient than the front wall, and if they are provided inside the cavity or at almost both ends of the front wall, the pillars at both ends provided adjacently Concrete, steel bars, PC steel rods or a combination thereof are put in the interior surrounded by the above, the concrete stacking blocks are integrated, and a solid retaining wall frame is provided.
[0010]
Furthermore, an integrated floor slab and handrail base block is provided so as to extend over the front wall, the beam and the upper part of the retaining wall, or a bottom slab is provided between the front wall of the top block and the beam and the inside Was filled with a civil engineering material such as concrete, reinforcing steel, or earth and sand, so that a sidewalk or a roadway portion could be formed at the top. The former is a handrail base block, and the latter is a cast-in-place concrete base, whose height can be freely adjusted and has a feature that can cope with the case where the road has a vertical gradient.
[0011]
In addition, in the construction of a retaining wall that fills the interior of the retaining wall with concrete, reinforcing steel, earth and sand, or other civil engineering material, the length of the retaining wall may be arbitrarily changed depending on the height of the retaining wall and the magnitude of the earth pressure. Therefore, it is possible to cope with a high retaining wall of 10 m or more. This retaining wall has a structure that resists earth pressure with the weight of the civil engineering material and concrete building blocks that are filled inside the retaining wall, and the stability calculation is performed in exactly the same way as the stability calculation of general retaining walls. It has the feature that the safety can be confirmed.
[0012]
The concrete masonry block for road widening is a concrete masonry block having at least a front wall and a retaining wall connecting the front wall, and one or more pillars standing at a steeper slope than the front wall are provided on the front wall. It is characterized in that it has at least a front wall, which means that it may have a rear wall on the back of a connecting wall connecting it.
[0013]
Furthermore, a bottom slab is provided between the front wall and the pillar and the inside thereof is partially filled with lightweight embankment material, earth and sand, or concrete to provide a concrete masonry block for road widening.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
This will be described with reference to the drawings. FIG. 1 is a construction perspective view of a retaining wall 1 formed by the road widening retaining wall construction method of the present invention, and FIG. 2 is an example of the construction example of FIG. It is sectional drawing.
The concrete masonry block 3 for road widening according to the present invention is stacked several steps above the concrete masonry block 4 which is usually used. A concrete building block comprising a front wall 5, a retaining wall 6 connecting the front wall 5, and a rear wall 8 at the back, and a plurality of commonly used concrete building blocks 4 are used. The concrete masonry block 3 for road widening having the pillars 7 rising from the front wall 5 to the front wall 5 at a steeper gradient than the front wall 5 is piled up from the end (four steps below the end), and the pillars 7 are almost vertically extended. It is in a continuous state.
[0015]
In the present invention, the normal gradient of the front wall is set to be between at least 20% gradient (in the example of FIG. 2, a gradient of 5 minutes (1: 0.5)) and substantially vertical, and the front wall 5 as described above is used. In the construction method of a retaining wall in which a space surrounded by a retaining wall 6 further behind is filled with a civil material such as concrete, reinforcing steel, or earth and sand, the front wall 5 has the same gradient, and a concrete masonry block for road widening is provided on the upper portion. It is characterized in that a plurality of 3 are stacked to form a retaining wall in a state where the pillars 7 are substantially vertically connected. The concrete 9, the reinforcing bar 10, the PC steel bar, or a combination thereof are put into the interior where the columns 7 are almost vertically connected to increase the strength.
[0016]
FIG. 3 is an exploded perspective view of an example of the floor block / handrail base block 2 used in the road widening retaining wall construction method described in FIGS. 1 and 2 and an example of the handrail 11 attached thereto. The floor block / handrail base block 2 has a hole 2a into which the handrail 11 is inserted, so that the handrail 11, the guardrail, and the like can be retrofitted.
[0017]
FIG. 4 is a construction perspective view showing another example of the road widening concrete stacking block 3 having a bottom slab 12 between the front wall 5 and the pillar 7 in which a reinforcing bar is inserted into a retaining wall and concrete is filled. .
[0018]
FIG. 5 shows the construction example of FIG. 4, in which a bottom plate 12 is provided between the front wall 5 of the concrete building block 3 for widening the road at the uppermost stage and the column beam 7, and a light embankment material, earth and sand or concrete such as concrete is provided therein. The material is filled so that a sidewalk or a roadway can be formed at the top. In this example, the base part of the part to which the handrail is attached is constructed of cast-in-place concrete 13 and a curb 14 is also provided.
[0019]
FIG. 6 is a perspective view of another example of the concrete masonry block 3 for widening a road, in which there are two retaining walls 6 behind a front wall 5 having a pillar 7 at the front, and a rear wall 8 behind. .
FIG. 7 is a perspective view of another example of the concrete masonry block 3 for widening a road, in which there is one retaining wall 6, a rear wall 8, and a bottom slab 12 is provided between the front wall 5 and the beam 7. . FIG. 8 is a perspective view of another example of the concrete masonry block 3 for road widening, and the retaining wall 6 is almost a concrete block.
[0020]
FIG. 9 is a perspective view of another example of the concrete masonry block 3 for widening the road, which has one retaining wall 6 and a rear wall 8. FIG. 10 is also a perspective view of another example of the road widening concrete stacking block 3, which has three retaining walls 6 and no rear wall 8. FIG. 11 is also a perspective view of the concrete masonry block 3 for widening a road according to the present invention, in which there are two retaining walls 6 and no rear wall.
[0021]
FIG. 12 is a perspective view of the road widening concrete stacking block 3, which is an example in which there are two retaining walls 6, no rear wall, and two columns 7 at both ends of the front wall. FIG. 13 is a perspective view of the construction example of FIG. Concrete 9, steel bars 10, PC steel rods, or a combination of these are put into the interior between the pillars 7, 7 at both ends of the concrete stacking block provided adjacently.
[0022]
Here, comparing the operation of the present invention in which the pillar 7 is provided in front of the front wall 5 with a conventional example, FIG. Yes, the slope of the retaining wall is 5 minutes, and the road width W is 6 m. In this case, in order to secure the road width W = 6 m, it is necessary to excavate the slope 21 of the mountain.
[0023]
However, FIG. 15 is a construction sectional view of an example of a road in a mountain area constructed with the concrete building block retaining wall 1 using the road widening concrete building block 3 of the present invention. And the road width W = 6 m. In this case, compared to FIG. 14, the width of the column 7 is widened by W1 = 2 m, so that it is not necessary to excavate the slope of the mountain by 2 m.
[0024]
FIG. 16 is a construction sectional view of the concrete block retaining wall 1 when the pillar 7 using the road widening concrete block 3 of the present invention is looser than vertical.
FIG. 17 is a construction sectional view when the column 7 using the road widening concrete building block 3 of the present invention is steeper (tighter) than vertical.
[0025]
FIG. 18 is an example of a construction sectional view of the gravity type retaining wall when the front wall 5 of the concrete masonry block 3 for road widening is vertical. FIG. 19 is a construction sectional view of a leaning type retaining wall example in which the front wall 5 of the road widening concrete stacking block 3 is vertical and the bottom b is narrower than the upper part a.
[0026]
FIG. 20 is an example of a construction sectional view of a leaning retaining wall in which the front wall 5 of the road widening concrete masonry block 3 is made of cast-in-place concrete and a vertical beam 7 is provided on the front surface thereof. FIG. 21 is a construction sectional view of an example in which the front wall 5 of the road widening concrete stacking block 3 has a gentle slope of about 20%.
[0027]
【The invention's effect】
The present invention provides a method for stacking a plurality of concrete masonry blocks for road widening having a column and a beam that rises from a certain step in front of the front wall with a steep gradient from the front wall. The beam was connected in a substantially vertical direction, and a hollow was formed therein, and concrete, a reinforcing steel bar, a PC steel bar, or a combination thereof was put into the inside and integrated to provide a solid retaining wall frame.
[0028]
In addition, the sidewalk and the road can be easily widened at the same time as the concrete block is economically and quickly constructed on the upper portion. Further, as shown in FIGS. 6 to 12, the present invention can be applied to most of the concrete building blocks currently used.
[0029]
Even when setting up a roadway in a mountainous area, it is usually necessary to excavate a considerable amount of the slope of the mountain to secure a road width of 6 m, for example, as in the case of a 5-minute sloping retaining wall in FIG. However, if 4 m vertical pillars are provided in front of the front wall as shown in FIG. 15, the road is widened by 2 m, so there is almost no need to excavate the mountain slope as in this example, which is economical. It has a great effect.
[0030]
Furthermore, it is possible to cope with a high retaining wall of 10 m or more by arbitrarily changing the length of the concrete block block retaining wall. In addition, since the construction can be performed easily by stacking concrete building blocks, it is not necessary to assemble and remove the formwork and assemble the scaffolding as in the case of cast-in-place concrete. Safe work has become possible.
[0031]
Even when the overhanging portion is formed, the pillar supports the beam from below, so that it can withstand a large wheel load such as a large truck. The overhanging part and the retaining wall body have a sufficient and safe structure. Further, since a large bending moment is not generated at the base of the overhang portion, a thick and large member is not required, and the structure is economical.
[0032]
Furthermore, since the overhanging portion and the lower retaining wall are integrally constructed, the construction period is short and the construction method is economical. In addition, it has a structure that can withstand sufficient earth pressure.
[Brief description of the drawings]
FIG. 1 is a construction perspective view of a retaining wall formed by a road widening retaining wall construction method.
FIG. 2 is a cross-sectional view of an example in which a floor block and handrail base block 2 is attached to an upper portion in the construction example of FIG.
FIG. 3 is an exploded perspective view of an example of a slab / foundation block used for a road widening retaining wall construction method and an example of a handrail attached to the slab.
FIG. 4 is a construction perspective view of a concrete masonry block for road widening having a bottom plate.
FIG. 5 is a construction sectional view of FIG. 4;
FIG. 6 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 7 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 8 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 9 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 10 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 11 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 12 is a perspective view of an example of a concrete building block for widening a road according to the present invention.
FIG. 13 is a perspective view of a construction example using the road widening concrete stacking block of FIG. 12;
FIG. 14 is a cross-sectional view of an example constructed with a general stacking block retaining wall.
FIG. 15 is a construction sectional view of a retaining wall using the concrete masonry block for road widening of the present invention.
FIG. 16 is a construction sectional view of a retaining wall in a case where columns and beams of a concrete masonry block for widening a road according to the present invention are looser than vertical.
FIG. 17 is a construction sectional view in a case where the columns and beams of the concrete masonry block for road widening are tighter than vertical.
FIG. 18 is a construction sectional view of a gravity type retaining wall when a front wall of a concrete masonry block for road widening is vertical.
FIG. 19 is a construction sectional view of a gravity retaining wall having a narrower bottom portion than the upper portion when the front wall of the concrete masonry block for road widening is vertical.
FIG. 20 is a construction sectional view of a leaning type retaining wall in which a front wall of a road widening concrete masonry block is made of cast-in-place filled concrete, and vertical pillars are provided on the front surface thereof.
FIG. 21 is a construction sectional view of an example in which a front wall of a concrete masonry block retaining wall for widening a road has a gentle slope of about 20%.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Retaining wall 2 Base block for floor slab and handrail 3 Concrete building block for road widening of the present invention 4 Concrete building block usually used 5 Front wall 6 Retaining wall 7 Column beam 8 Rear wall 9 Concrete 10 Reinforcing bar 11 Handrail a top b bottom

Claims (7)

A concrete block having at least a front wall and a retaining wall connecting the front wall is used in a plurality of stages, and the normal gradient of the front wall is between a gentle gradient of about 20% (1: 2.0) and substantially vertical, and In the construction method of retaining wall, which is filled with civil engineering material such as concrete, reinforcing steel, or earth and sand, the front wall has the same slope, and the columns and beams rise from a predetermined step up to the front wall at a steeper slope than the front wall A road widening retaining wall construction method, comprising stacking a plurality of concrete pile blocks each having a column, and making the columns and beams almost vertically connected. The road widening retaining wall construction method according to claim 1, wherein concrete, rebar, PC steel rod, or a combination thereof is put inside the column and beam in a state of being substantially vertically connected. 2. The road widening retaining wall construction method according to claim 1, wherein concrete, a reinforcing bar, a PC steel rod, or a combination thereof is put in the space between the pillars at both ends of the concrete building block provided adjacently. . The road widening retaining wall construction method according to any one of claims 1 to 3, wherein an integrated floor slab and handrail base block is provided so as to extend over the front wall, the pillar and the upper part of the retaining wall. . When constructing a retaining wall by filling the inside of the retaining wall with concrete, reinforcing steel, earth and sand, etc., make sure that the length of the retaining wall is arbitrarily changed according to the height of the retaining wall and the magnitude of earth pressure. The road widening retaining wall construction method according to any one of claims 1 to 4, wherein: A concrete masonry block having at least a front wall and a retaining wall connecting the front wall, the concrete masonry block being provided with one or a plurality of pillars rising at a steeper slope than the front wall. block. 7. The concrete building block for widening roads according to claim 6, wherein a bottom slab is provided between the front wall and the pillar, and a part of the inside thereof is filled with lightweight embankment material, earth and sand, or concrete.

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