JP5229913B2 - Slope reinforcement method - Google Patents

Description

  The present invention relates to a slope reinforcing method for constructing a reinforced earth wall and the like that are extremely excellent in earthquake resistance.

As conventional slope reinforcement methods, the following reinforced earth methods such as cut slopes are known. This method is based on the following construction procedure.
(1) Secure a stepped part by excavating the mounting surface that is high enough to install the first-stage concrete precast plate from the top to the bottom of the reinforced soil surface to be formed.
(2) A mounting table for arranging the precast plates in parallel is fixed on the step on the mounting surface side,
(3) A precast plate is arranged in parallel on the mounting table with a spacer interposed between the mounting surface side and
(4) Next, after drilling from the mounting hole provided in each precast plate to the mounting surface side and inserting a bar-like reinforcing material such as a reinforcing bar from the mounting hole into the drilled portion, the back side of the drilled portion and the precast plate Injecting mortar into the gap,
(5) Each protruding end of the reinforcing material is fixed at the mounting hole and integrally connected to the precast plate,
(6) After drying the mortar, remove the mounting table, and form a stepped part by excavating the mounting surface with a height that can install the concrete precast plate from the second stage,
(7) The second-stage precast plate is suspended from the lower end of the first-stage precast plate, and a spacer is interposed between the mounting surface side,
(8) After drilling from the mounting hole pierced through the second-stage precast plate and inserting the rod-shaped reinforcing material from the mounting hole into the drilled portion, into the gap on the back side of the drilled portion and the second-stage precast plate Injecting mortar,
(9) The protruding ends of the reinforcing members are fixed to the mounting holes and integrally connected to the second-stage precast plate,
(10) By repeating this, a reinforced soil surface having precast plates in a plurality of stages is formed.
(11) Further, the precast plates adjacent to the upper and lower sides and both side portions may be welded together with the iron plates projecting from the outer periphery of the back surface (see Patent Document 1).

  Since the reinforced earth method such as the cut slope of such construction procedure is a construction in which precast plates are installed simultaneously with the earth retaining from the upper part, the occupied land width can be reduced and the amount of earth work can be reduced. In addition, since the lower precast plate is suspended and temporarily fixed, the construction period can be shortened and simplified. Furthermore, when the upper and lower sides and both side portions of the precast plate are connected by welding, there is an advantage that temporary fixing is performed.

Japanese Patent No. 2530565

  In this reinforced earth method such as a cut slope of the conventional example, even if the upper and lower sides and both side portions of adjacent precast plates are welded, it only serves as a temporary fixing. That is, the precast plates are not integrally connected and fixed, and thus have a problem that the earthquake resistance is inferior.

  Therefore, the reinforced earth method such as the cut slope in the conventional example has a problem to be solved by improving the earthquake resistance by integrally connecting and fixing the precast plates arranged on the slope. doing.

The gist of the present invention for solving the problems of the conventional example is that it is formed in a rectangular shape, a hole (17) is provided in the central portion, and a PC steel rod is provided along the vertical direction at positions near both ends. A precast concrete plate (11) having insertion holes (18) and (18) into which (19) is inserted is used, and the precast concrete plate (11) is moved from the uppermost stage to the lower stage of the slope (12). A slope reinforcing method that is sequentially arranged, a step of excavating a slope (12) on which the first-stage precast concrete plate (11) is placed to a predetermined slope and then leveling, and the sloped slope Disposing the precast concrete plate (11) through a spacer (23), injecting grout (30) into the gap between the precast concrete plate (11) and the slope (12), The hole ( 7) drilling the slope (12) to form a drilling hole (28), inserting a reinforcing bar (29) into the drilling hole (28) and then injecting a grout (32); And fixing the end (29a) of the reinforcing reinforcing bar (29) and connecting it to the precast concrete plate (11), and the second and subsequent constructions repeat the above steps continuously. When performing the step of disposing the precast concrete plate (11) on the slope (12), the PC steel bar (19) of the precast concrete plate (11) and the precast concrete plate (19) located in the upper stage Tensile force was introduced after connecting the PC steel rod (19) of the steel plate using a coupler (35), and the side portions of the precast concrete plates (11) arranged side by side were respectively a concave portion (42) and a convex portion. ( With 3) and is located in the fitted state, the precast concrete plate (11) binding plate that straddled with each other (44) is to be provided.

According to the slope reinforcing method according to the present invention, since the PC steel bar of the precast concrete plate is connected to the PC steel bar of the precast concrete plate located at the upper stage of the slope, tension is introduced, so The arranged precast concrete plates are integrally connected and fixed, and the earthquake resistance is greatly improved.
Moreover, the connection between PC steel bars becomes a certain connection state by using a coupler, and the precast concrete plates are firmly connected and fixed .
The side portions of the precast concrete plates arranged in parallel are located in a state where the concave portions and the convex portions are in a fitted state, respectively, and the precast concrete plates are provided by providing a coupling plate straddling the precast concrete plates. It will be connected and fixed not only in the vertical direction but also in the parallel direction, and it has the excellent effect of further improving the earthquake resistance.

It is explanatory drawing which shows the state which excavates the slope 12 which arrange | positions the 1st-stage precast concrete board 11 to a predetermined | prescribed gradient. It is a front view of the precast concrete board. It is explanatory drawing which shows the state which arrange | positions the precast concrete board 11 on the slope 12. It is explanatory drawing which shows the state which inject | pours the grout 30 in the clearance gap 24 of the precast concrete board 11 and the slope 12. FIG. It is explanatory drawing which shows the state which excavates the slope 12 with the drilling machine 27, forms the excavation hole 28, inserts the reinforcing bar 29, and injects the grout 32. FIG. It is explanatory drawing which shows the state which fixes the edge part 29a of the reinforcing steel bar 29, and connects with the precast concrete board 11. FIG. It is explanatory drawing which shows the state which excavates the slope 12 which arrange | positions the 2nd-stage precast concrete board 11 to a predetermined | prescribed gradient. It is explanatory drawing which shows the state which connects the PC steel bar 19a of the precast concrete board 11a of the 2nd step, and the PC steel bar 19 of the precast concrete board 11 located in the upper stage, and introduces the tension force with the torque wrench 34. . It is sectional drawing which shows the precast concrete board 11, 11a, 11b of the state which PC steel bar 19, 19a, 19b connected. It is sectional drawing which shows the plane of the precast concrete board 11 and 11 in parallel.

  Next, the slope reinforcing method of the present invention will be described with reference to the drawings. First, as shown in FIG. 1, the uppermost stage of the slope 12 on which the precast concrete plate 11 is disposed is excavated by one stage to a predetermined gradient by operating the backhoe 13. The height of one step is preferably about 1.30 m in consideration of the height of the precast concrete plate 11 and the height of the temporary foundation 14.

  Then, after leveling the unevenness of the slope 12, the laying sand 15 is disposed, and the temporary foundation 14 is installed on the top. In addition, the code | symbol 16 in FIG. 1 shows the temporary embankment scaffold provided in order for the backhoe 13 etc. to work, and the code | symbol 25 shows a natural ground.

  As shown in FIG. 2, the precast concrete board 11 is formed in a rectangular shape. When an example of the size is shown, the height is about 1000 mm, the width is about 2000 mm, and the thickness is about It is about 165 mm. In addition, a hole 17 is provided at the center, and insertion holes 18 and 18 are formed along the vertical direction at positions near both ends. A PC steel rod 19 is inserted into the insertion hole 18 (see FIGS. 8 and 9).

  Next, as shown in FIG. 3, the precast concrete plate 11 is lifted by the crane 20 and placed on the upper portion of the temporary foundation 14 and arranged in a state along the slope 12. At this time, the packing material 22 is interposed above the temporary base 14. A predetermined gap 24 is provided between the slope 12 and the precast concrete plate 11 with a spacer 23 interposed.

  In addition, since it is a reverse winding construction in which construction is performed sequentially from the upper stage to the lower stage, when the precast concrete plate 11 is disposed on the uppermost stage, an adjustment plate (not shown) is accurately installed by surveying, so that there is a deviation or the like. It is necessary not to occur.

  Then, as shown in FIG. 4, a grout 30 is injected into the gap 24 between the precast concrete plate 11 and the slope 12. In addition, the code | symbol 26 in FIG. 4 shows the injection hose for inject | pouring the grout 30. FIG.

  Next, as shown in FIG. 5, the drilling machine 27 is operated to excavate the slope 12 from the hole 17 provided in the precast concrete plate 11 to a predetermined depth to form a drilling hole 28. Further, after inserting the reinforcing reinforcing bar 29 into the excavation hole 28, the grout 32 is injected.

  After the grout 32 is cured, as shown in FIG. 6, the end 29 a of the reinforcing reinforcing bar 29 is fixed and connected to the precast concrete plate 11 using a torque wrench (not shown). Then, the cap plate 31 is attached to the end 29 a of the reinforcing reinforcing bar 29.

  By performing the steps described above (see FIGS. 1 to 6) and arranging a plurality of precast concrete plates 11 in parallel, the precast concrete plate 11 is installed on the uppermost stage of the slope 12.

  Each of these steps is repeated again and briefly described as follows. The step of excavating the uppermost step of the slope 12 on which the precast concrete plate 11 is disposed to a predetermined slope and then leveling the ground (see FIG. 1), and the precast concrete plate 11 is arranged on the sloped slope 12 via the spacer 23. A step of installing (see FIG. 3), a step of injecting the grout 30 into the gap between the precast concrete plate 11 and the slope 12 (see FIG. 4), and the slope 12 from the hole 17 provided in the precast concrete plate 11. Drilling a predetermined depth to form the drilling hole 28 (see FIG. 5), inserting the reinforcing bar 29 into the drilling hole 28 and then injecting the grout 32 (see FIG. 5), and the end of the reinforcing bar 29 A step of fixing the portion 29a and connecting it to the precast concrete plate 11 (see FIG. 6).

  The construction of the precast concrete plate 11a after the second stage (see FIG. 7) is performed by repeating the above steps continuously and connecting the later-described PC steel bars 19, 19a. That is, when the precast concrete plate 11a of the second and subsequent steps is disposed on the slope 12, as shown in FIG. 8, the PC steel bar 19a inserted into the precast concrete plate 11a and the precast concrete located on the upper step. After connecting the PC steel bar 19 inserted into the plate 11, the tension is introduced.

  The process shown in FIG. 8 will be described in detail. First, the second-stage (lower) precast concrete board 11a is lifted by the crane 20 and placed on the lower side of the precast concrete board 11 located on the upper stage. And the end part of PC steel bar 19 of the precast concrete board 11 located in the upper stage and PC steel bar 19a of the precast concrete board 11a of the 2nd stage (lower stage) are connected with a coupler 35.

  After connecting the PC steel bars 19 and 19a, the second-stage (lower) precast concrete plate 11a is pulled up to a predetermined position and installed. Next, an anchor plate, a washer, and a coupler 35 (not shown) are attached to the lower end of the PC steel bar 19a, and a tension force is introduced by a torque wrench 34. At this time, it is necessary to accurately fix and install the precast concrete plate 11a while confirming the position and gradient of the precast concrete plate 11a. Arrangement of the precast concrete plates 11b at the third and subsequent stages is performed by sequentially repeating the connection of the PC steel bars and the introduction of the tension force in the same manner as described above.

  In this way, since the tension is introduced after the PC steel bars 19 and 19a are connected by the coupler 35, the precast concrete plates 11 and 11a disposed on the slope 12 are integrally connected and fixed. The earthquake resistance is greatly improved. Moreover, since the coupler 35 is used for the connection between the PC steel bars 19 and 19a, the connection state is strong and reliable.

  FIG. 9 shows the slope 12 on which the precast concrete plates 11, 11 a, 11 b are arranged by the construction procedure as described above. The PC steel bars 19, 19a, 19b are connected to each other by a coupler 35. Moreover, the top end concrete 36 is provided in the upper end part, and the coupler protective cap 37 and the volt | bolt 38 are attached. Furthermore, a lower concrete 39 is provided at the lower end, and a coupler protective cap 37 and a bolt 38 are attached. In addition, the code | symbol 40 shows the auxiliary steel plate for adjustment, and the code | symbol 41 shows a polystyrene foam.

  Next, the structure of the side parts of the precast concrete plates 11 and 11 arranged in parallel will be described. As shown in FIG. 10, the side surface portions have the concave portion 42 and the convex portion 43 in a fitted state. Moreover, since the coupling plate 44 straddling the precast concrete plates 11 and 11 is fixed, the precast concrete plates are connected and fixed not only in the vertical direction but also in the parallel direction, and the earthquake resistance is further improved.

  In addition, when constructing the precast concrete plate 11a in the second and subsequent stages, a drainage material 33 is installed as shown in FIG. The drainage material 33 is installed horizontally and subjected to water stop treatment with a waterproof sheet (not shown). What is necessary is just to install this drainage material 33, whenever a precast concrete board is constructed in two steps.

11, 11a, 11b Precast concrete plate 12 Slope 13 Backhoe 14 Temporary foundation 15 Laying sand 16 Temporary embankment scaffold 17 Hole 18 Insertion hole 19, 19a, 19b PC steel bar 20 Crane 22 Packing material 23 Spacer 24 Clearance 25 Ground 26 Injection hose 27 Drilling machine 28 Drilling hole 29 Reinforcing bar 29a End 30 Grout 31 Cap plate 32 Grout 33 Drainage material 34 Torque wrench 35 Coupler 36 Top end concrete 37 Coupler protection cap 38 Bolt 39 Lower concrete 40 Supplementary steel plate 41 Styrofoam 42 Concave part 43 Convex part 44 Coupling plate

Claims (1)

It is formed in a rectangular shape, a hole (17) is provided in the center, and insertion holes (18), (18) into which PC steel bars (19) are inserted along the vertical direction at positions near both ends. ) Having a precast concrete plate (11) having a slope reinforcement method in which the precast concrete plate (11) is sequentially disposed from the uppermost stage to the lower stage of the slope (12),
A step of excavating the slope (12) on which the first-stage precast concrete plate (11) is disposed to a predetermined gradient and then leveling the ground;
Disposing the precast concrete plate (11) via a spacer (23) on the leveled slope;
Injecting grout (30) into the gap between the precast concrete plate (11) and the slope (12);
Drilling the slope (12) from the hole (17) to form a drilling hole (28);
Injecting a grout (32) after inserting a reinforcing bar (29) into the borehole (28);
Fixing the end (29a) of the reinforcing reinforcing bar (29) and connecting it to the precast concrete plate (11),
In the construction after the second stage, the above steps are continuously repeated, and when the precast concrete plate (11) is disposed on the slope (12), the precast concrete plate (11) After connecting the PC steel bar (19) and the PC steel bar (19) of the precast concrete plate (19) located in the upper stage using a coupler (35), a tension force is introduced ,
The side plates of the precast concrete plates (11) arranged side by side have a concave portion (42) and a convex portion (43) in a fitted state, and a connecting plate that straddles the precast concrete plates (11). (44) is provided, the slope reinforcement construction method characterized by the above-mentioned.

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