JPH0726402B2 - Reinforcement method such as cut slope - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method for stabilizing a cut slope.

[0002]

2. Description of the Related Art In recent years, in order to stabilize a cut slope, a reinforcing bar insertion method of driving a reinforcing bar into the cut slope is often used, which can cope with steep slopes and can shorten the construction period. However, it has a problem with long-term reliability compared to the conventional motar type retaining wall method and frame method, so it is currently used as an alternative method for temporary soil retention. Further, in the conventional reinforcing bar insertion method, the outer surface becomes a mortar sprayed surface, which is also unsatisfactory in terms of aesthetics.

[0003]

Therefore, the present invention can cope with a steep slope, is economical, and can shorten the construction period.
It provides a construction method that is aesthetically pleasing, secures long-term reliability, and can be made into a permanent structure.

[0004]

Therefore, the method of the present invention is
A step portion is formed by excavating a mounting surface of a height at which the first-stage concrete precast plate can be installed from the upper end of the reinforcing cut surface to be formed, and a mounting surface is formed with a certain gap from the mounting surface. The precast plates are arranged in parallel with each other, and then the mounting holes penetrating the respective precast plates are drilled to the mounting surface side, and a rod-shaped reinforcing material such as a reinforcing bar is inserted into the drilled holes through the mounting holes, and then the After injecting mortar into the holes and the gaps on the back side of the precast plate, fixing the protruding ends of the reinforcements with the mounting holes and integrally connecting to the precast plate and fixing the precast plate to the mounting surface, the second stage from the top Form a stepped part that excavates a mounting surface of a height at which the concrete precast plate can be installed, and connect the second precast plate to the lower end of the first precast plate with a gap between it and the mounting surface side. The second stage After inserting a rod-shaped reinforcing material into the drilled portion from the mounting hole by drilling from the mounting hole transparently provided in the cast plate, mortar is injected into the drilled part and the back side gap of the second-stage precast plate, each protruding end of the reinforcing material secured to the mounting hole portion integrally connected to the precast plate of the second stage, the reinforcement switching with a precast plate in a plurality of stages by repeating this
The construction method is used to form the soil surface . In addition, secure the step part where the mounting surface of the height of the first stage concrete precast plate can be installed from the upper end of the reinforcing cut surface to be formed to the bottom, and place the precast plates in parallel. Fixing the engaging rail for use on the stepped portion on the mounting surface side, engaging the precast plate with the engaging rail and arranging them in parallel, and attaching the top end engaging rail to the upper end of the precast plate. The precast plate is temporarily fixed by fixing the engagement rail for the top end to the mounting surface side, and then the mounting holes are drilled from the mounting holes penetrating the respective precast plates to the mounting surface side and After inserting a rod-shaped reinforcing material such as a reinforcing rod into the mortar, mortar is injected into the gap between the drilled portion and the back side of the precast plate, and the protruding ends of the reinforcing members are fixed to the mounting holes to integrally connect to the precast plate, after drying of the mortar, before described置用engagement Over
The second step from the top , and then a second step from the top is formed by excavating a mounting surface with a height at which the concrete precast plate can be installed, and a mounting engagement rail is arranged and fixed to the second step. The precast plate is engaged and placed, and its upper end
Are temporarily connected to the lower end of the first-stage precast plate to temporarily secure the second-stage precast plate, and the second-stage precast plate is drilled from the mounting holes formed through the mounting holes. After inserting the rod-shaped reinforcing material into the holes, mortar is injected into the hole and the backside gap of the second-stage precast plate, and the protruding ends of the reinforcing materials are fixed to the mounting holes, respectively, and the second-stage precasting is performed. It is a reinforcing construction method in which a reinforcing cut surface having a plurality of stages of precast plates is formed by integrally connecting to a plate and repeating this.

[0005]

In the method of the present invention, the reinforcing cut surface is sequentially formed from the upper end to the lower side . First, a flat step portion is formed by excavating the mounting surface of a height at which the concrete precast plates can be installed in parallel. Precast plates are arranged side by side with a gap from the mounting surface side. Next, after drilling holes from the mounting holes formed transparently through the respective precast plates to the mounting surface side and inserting a rod-shaped reinforcing material such as a reinforcing bar into the drilled holes through the mounting holes, mortar is injected into the drilled holes. , Inject mortar into the gap between the soil surface and the backside of the precast plate to backfill. Further, nuts are screwed onto the protruding ends of the reinforcing members protruding from the mounting holes, respectively, and fixed to the mounting holes, so that the reinforcing member is integrally connected to the precast plate by drying the mortar. .

[0006] Then, a step portion is formed by excavating a mounting surface of a height at which the concrete precast plate can be installed in the second stage from the top, and the lower end portion of the first stage precast plate and the upper end thereof are connected by bolts, etc. The second precast plate is temporarily fixed. In the same manner as described above, a rod-shaped reinforcing material is drilled from the mounting hole that is transparently provided in the second-stage precast plate, and mortar is injected into the hole and the backside gap of the second-stage precast plate, respectively. By fixing the protruding end of the reinforcing member to the mounting hole, the reinforcing member is integrally connected to the second-stage precast plate, and the first-stage and second-stage precast plates are integrated. By repeating this, the reinforcing cut surface having the precast plates in multiple stages is formed.

At the time of installing the precast plate, a mounting engagement rail for arranging the precast plates in parallel is leveled out on the step portion on the mounting surface side and fixed by an anchor pin or the like, The concrete precast plates may be engaged with and arranged in parallel, and the top end engagement rail may be attached to the upper end of the precast plate to fix the top end engagement rail to the mounting surface side with an anchor pin or the like. . Since the second-stage precast plate is also mounted on the mounting engagement rails, and the lower end and the upper end of the first-stage precast plate are connected by bolts or the like, the second-stage precast plate is temporarily fixed. is there.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a reinforced cut surface obtained by the construction method of this example, and FIG. 2 shows a concrete precast plate used for it. The precast plate 1 has a length and a width of 1.
A receiving ring 11 having a circumference of 5 m and a thickness of 8 cm, and having a circumferential inner surface that is recessed inward at its center is connected and welded to vertical and horizontal reinforcing bars 12 to be accommodated and fixed. And the mounting hole 13 is provided so as to be opened. Further, the upper end has a shape of a projecting portion 17 that can be engaged with the lower projecting portion 15, and a mortar injection hole 14 is provided in the center upper portion.

In the construction method of this example, first, the stepped portion 21 is excavated and secured by excavating the mounting surface of about 1.5 m, which is the height at which the first-stage concrete precast plate 1 can be juxtaposed downward from the upper end of the slope. Then, as shown in FIG. 3, a mounting engagement rail 3 for arranging the precast plates 1 in parallel is installed on the step portion on the mounting surface side, and an anchor pin 31 is driven in to mount the mounting engagement rail 3 thereon. Is fixed horizontally. Then, the lower end projecting portion 15 of the precast plate 1 is engaged with the engaging rail 3 and arranged in parallel, and the upper end projecting portion 17 of the precast plate 1 is covered with the upper end engaging rail 4 to attach the anchor pin. The precast plate 1 is temporarily fixed and held by driving in 41 to fix the top end engaging rail 4 to the mounting surface side.

Then, as shown in FIG. 4, about 5 m is drilled from the mounting holes 13 formed through the precast plate 1 to the mounting surface side by the respective drilling machines, and the deformed reinforcing bars are formed from the mounting holes 13 to the drilled portions 16. After inserting 5, the mortar 6 is injected into the drilled hole portion 16 from the mounting hole 13 and the mortar 6 is injected into the gap between the soil surface and the back side of the precast plate 1 from the injection hole 14 as shown in FIG. Give. After the grout, he cured for a day,
As shown in FIG. 6, the trapezoidal nut 7 is screwed onto the screw end portion 51 of each deformed rebar 5 protruding into the mounting hole 13 to receive the ring 11.
Abut. As a result, the deformed rebar 5 becomes trapezoidal nut 7
The precast plate 1 is integrally connected to the precast plate 1, and the precast plate 1 is fixed on the slope via the mortar 6. It should be noted that mortar is injected into the front space of the mounting hole 13.

After the mortar is dried, the anchor pin 31 is pulled out to remove the mounting engagement rail 3 and the anchor pin 41 is removed to remove the ceiling end engagement rail 4. Then, similarly, a step portion 22 is formed by excavating a mounting surface of a height at which the concrete precast plate can be installed in the second step from the top, and as shown in FIG. 7, the mounting engagement rail 3 is mounted on the step portion 22. Are fixed and fixed by anchor pins 31, the lower end protruding steps 15 of the second-stage precast plate 1 are engaged and mounted on the mounting engagement rails 3, and the upper ends of the protruding steps 17 are set to the first step. The precast plate 1 of the second stage is temporarily fixed by connecting it to the lower end protruding portion 15 of the precast plate of FIG. In addition, the engagement of the precast plate 1 is as shown in FIG.
It is fixed by screwing at the plate 19 portion embedded in each.

Then, as shown in FIG. 9, the mounting hole 1 is formed by drilling from the mounting hole 13 formed through the second precast plate 1.
The deformed bar 5 is inserted into the drilled portion 16 from 3 and the mortar 6 is injected into the gap between the drilled portion 16 and the back side of the precast plate 1 in the same manner as described above. After grouting, curing for one day, trapezoidal nuts 7 are screwed to the screw ends 51 of each deformed bar 5 and brought into contact with the receiving ring 11 to be integrally connected to the precast plate 1, and the precast plate 1 is connected via the mortar 6. Settle on the slope.

Similarly, a step portion is formed by excavating a mounting surface of a height at which the concrete precast plate can be installed in the third step from the top, installation of mounting rails for mounting, and precast plate in the third step. Temporary fixing, drilling a hole, inserting a deformed bar, injecting mortar into the gap between the hole and the back side of the precast plate, after curing, connecting the deformed bar with a trapezoidal nut, and removing the mounting engagement rail. By repeating each step,
Reinforcing cut with multiple precast plates 1 like
It forms a surface .

According to the construction method of this example, the precast plate 1 connects the upper end projecting portion 17 thereof with the ceiling engaging rail 4 or the lower end projecting portion 15 of the upper precast plate 1 by the bolt 18, and the lower projecting portion thereof. The part 15 is engaged with the mounting engagement rail 3 and temporarily fixed, and in this state, mortar is injected into the grout and the mounting surface part, so that the precast plate 1 can be stably and stably mounted, and the end portion of the deformed rebar 5 Since the trapezoidal nut 7 screwed in is received by the receiving ring 11, the deformed bar 5 can be integrally connected to the precast plate 1 to secure the fixing.
Therefore, the precast plate 1 does not peel off and fall.

As described above, according to this example, since the precast plate is installed simultaneously with the soil retention from the top, the space for exclusive use can be reduced, the amount of earthwork can be reduced, and the construction period can be shortened. Further, since the slope is a precast plate, the appearance is good, and the appearance can be further improved depending on the finish of the precast plate.

According to the precast plate 1 of this example,
Since the receiving ring 11 that receives the trapezoidal nut 7 is built in and is fixed to the reinforcing bar 12, the engagement with the trapezoidal nut 7 can be ensured, so that the deformed bar 5 can be integrally connected to the precast plate 1 and the fixation can be secured. Of.

The construction methods of this example were each constructed as described above.
The present invention is not limited to this. For example, regardless of the slope gradient of the reinforcing cut surface to be formed, a vertical gradient can be applied. Further, when the mounting engagement rails and the ceiling end engagement rails are used for arranging the precast plates in parallel, the shape and configuration thereof are appropriate, and it is sufficient that the precast plates can be fixed with a gap.

Further, the rod-shaped reinforcing material to be inserted into the drilled portion is optional, and the means for injecting mortar into the gap between the drilled portion and the back side of the precast plate is not limited. It should be noted that a configuration in which the protruding ends of the reinforcing members are fixed to each other by the mounting holes and integrally connected to the precast plate is also appropriate. Further, the joining structure of the upper and lower precast plates is not limited, and the precast plates may be connected as shown in FIG. 10 or 11. Further, regardless of the juxtaposition of the precast plates in each step, as shown in FIG. 12, the protruding step parts at the respective side ends may be engaged and juxtaposed.

In the concrete precast board, the number and position of the mounting holes for inserting the reinforcing material are not limited.
The size and shape of the precast plate are also arbitrary.

[0020]

According to the present invention, since the precast plate is installed at the same time from the top as the soil is retained, the space for exclusive use can be reduced, the amount of earthwork can be reduced, and the construction period can be shortened. Further, since the fixing of the precast plate can be ensured, the reliability can be made high and a permanent structure can be obtained, and the appearance becomes good because the slope becomes the precast plate, and the aesthetic appearance can be further improved depending on the finish of the precast plate. It has a great effect. Further, according to the second aspect, it is possible to surely arrange the precast plates in parallel.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cut slope according to an embodiment of the method of the present invention.

FIG. 2 is a perspective view showing an example of a concrete precast plate with a main part cut away.

FIG. 3 is a vertical cross-sectional view showing a state in which the step portion is secured by excavating the first step and the mounting engagement rail is fixed.

FIG. 4 is a vertical cross-sectional view showing a state in which the first-stage precast plate is temporarily fixed and holes are drilled.

FIG. 5 is a vertical cross-sectional view showing a state in which a deformed bar is inserted into a drilled portion, grouted, and mortar is injected into the back surface of the precast plate.

FIG. 6 is an enlarged vertical sectional view showing a state in which deformed reinforcing bars are connected to each other through mounting holes of a precast plate.

FIG. 7 is a vertical cross-sectional view showing a state where the second-stage precast plate is temporarily fixed.

FIG. 8 is an enlarged vertical cross-sectional view showing a joint portion between upper and lower precast plates.

FIG. 9 is a vertical cross-sectional view showing a state in which a deformed reinforcing bar is inserted into the second-stage drilled portion, grouting, and mortar is injected into the back surface of the precast plate.

FIG. 10 is an enlarged vertical cross-sectional view showing another example of the joint portion between the upper and lower precast plates.

FIG. 11 is a vertical cross-sectional view showing still another example of the joint portion between the upper and lower precast plates.

FIG. 12 is a transverse cross-sectional view showing another example of the joining portion of the horizontal precast plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast 11 Receiving ring 12 Reinforcing bar 13 Mounting hole 14 Mortar injection hole 15 Lower end projecting part 16 Drilling part 17 Upper projecting part 18 Bolt 19 Plate 21, 22 Step part 3 Mounting engagement rail 31 Anchor pin 4 Top end engagement rail 41 Anchor pin 5 Deformed bar 51 Screw end 6 Mortar 7 Trapezoid nut

Claims (2)

[Claims] 1. A step portion is formed by excavating a mounting surface of a height at which a first-stage concrete precast plate can be installed from the upper end of a reinforced cut surface to be formed, and forming a stepped portion with the mounting surface. Pre-cast plates are arranged side by side on the mounting surface, then drill holes are drilled from the mounting holes formed in each pre-cast plate to the mounting surface side, and reinforcing rods and other rod-shaped reinforcing materials are inserted from the mounting holes into the drilled holes. After that, mortar is injected into the gap between the drilled portion and the backside of the precast plate, and the protruding ends of the reinforcing members are fixed to the mounting holes, respectively, and integrally connected to the precast plate to fix the precast plate to the mounting surface. A second step is formed on the lower end of the first precast plate with a gap between the mounting surface and the mounting surface of the concrete precast plate. Connect the precast boards of , After drilling holes from the mounting holes transparently provided in the second-stage precast plate and inserting a rod-shaped reinforcing material from the mounting holes into the drilled holes, Inject mortar, fix the protruding ends of the reinforcing materials to the mounting holes, and integrally connect to the second-stage precast plate, and repeat this to form a reinforced cut surface with multiple precast plates Reinforcement method for cut slopes, etc. 2. A precast board is arranged in parallel so as to secure a stepped portion in which a mounting surface is excavated from the upper end of the reinforced cut surface to be formed downwardly so that the first precast concrete board can be installed. Fixing the mounting engagement rail on the stepped portion on the mounting surface side, engaging the precast plate with the engagement rail and arranging them in parallel, and covering the upper end of the precast plate with the top end engaging rail. The precast plate is temporarily fixed by attaching the top end engaging rails to the mounting surface side, and then the mounting holes are drilled from the mounting holes penetrating the respective precast plates to the mounting surface side. After inserting a rod-shaped reinforcing material such as a reinforcing bar into the drilled hole, mortar is injected into the hole and the backside gap of the precast plate, and the protruding ends of the reinforcing member are fixed to the mounting holes and integrated with the precast plate. ligated, after drying of the mortar, the placement After removing the engaging rail for mounting, the second step from the top is formed by forming a stepped portion by excavating the mounting surface of a height at which the concrete precast plate can be installed, and the mounting engaging rail is arranged and fixed on the stepped portion. Place the precast plate of the first stage in the engagement and place the upper end of
The second-stage precast plate is temporarily fixed by connecting with the lower end of the cast plate, and a rod-shaped reinforcing material is drilled from the mounting hole through the mounting hole that is transparently provided in the second-stage precast plate. After inserting, mortar is injected into the hole and the backside gap of the second-stage precast plate, and the protruding ends of the reinforcing members are fixedly attached to the mounting holes, respectively, and integrally connected to the second-stage precast plate, By repeating this, reinforcement with multiple precast plates
Reinforcement method such as cut slope to form cut surface .