JPH09324433A - Reinforcing work method for existing earth retaining slope regarding cut face slope or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth retaining slope reinforcing method capable of shortening a construction period, providing necessary strength and even ensuring good appearance. SOLUTION: Precast concrete slabs 1 are arranged at intervals on the lowermost stage of an existing stone wall 9. A hole is drilled inside from the mounting hole 10 of each slab 1, and a deformed reinforcing bar 51 is inserted from the mounting hole 10. Thereafter, a gap between a drilled part 5 and the rear side of the precast concrete slab 1 is filled with mortars 61 and 62, thereby jointing each projected end of deformed reinforcing bars 51 to the precast concrete slab 1 integrally. Furthermore, the second stage of precast concrete slabs 1 are arranged on the upper end of the lowermost precast concrete slabs 1 secured to the stone wall 9 at intervals via a gap from the stone wall 9, and a hole is drilled from the mounting hole 10 formed through the each slab 1. Then, deformed reinforcing bars 51 are inserted in drilled parts 5. Thereafter, a gap between the drilled part 5 and the rear side of the second stage slab 1 is filled with mortar 61 and 62 for jointing the projected ends of the bars 51 to the second stage slabs 1 integrally. This process is repeated for an upper stage, thereby forming a reinforcing slope having a plurality of stages of precast slabs 1 on the external side of the stone wall 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing an existing sloped earth retaining surface such as a cut slope.

[0002]

2. Description of the Related Art Existing slopes such as cut slopes are exposed to rain and wind and become insufficient in strength over time, or further reinforcement is required as a countermeasure against earthquakes. In this case, conventionally, concrete was cast from the existing earth retaining slope or the existing soil retaining slope was once removed to newly construct a strong earth retaining slope. However, in the case where concrete is cast from the existing sloped earth retaining surface, a large amount of work is required for the concrete formwork, and the reinforcement strength corresponding to it cannot be obtained. In addition, it is also a difficult task to remove the existing earth retaining slope once and construct a new strong earth retaining slope.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention provides a method for reinforcing an existing sloped earth retaining surface which is economical, shortens the construction period, provides sufficient reinforcement strength, and has a good appearance. is there.

[0004]

Therefore, the method of the present invention is
A concrete precast plate is placed at the outermost bottom of the retaining wall such as stone or concrete that is placed on the slope to be reinforced with a small gap between it and the outside of the retaining wall, and then the precast plate After drilling from the mounting hole that is transparently provided to the inside through the soil retaining wall and inserting a rod-shaped reinforcing material such as a reinforcing bar into the drilling portion from the mounting hole, the drilling portion and the soil retaining wall of the precast plate Inject mortar into the back side gap, fix the protruding ends of the reinforcing materials with the mounting holes and integrally connect to the precast plate, and after drying the mortar, place it on the upper end of the bottom precast plate that is fixed to the soil retaining wall. , The second-stage precast plate is temporarily fixed to the outside of the retaining wall with a gap between it and the second-stage precast plate is drilled to the inside through the mounting hole transparently attached to the retaining plate. From the mounting hole to the hole Mortar is injected into the hole and the back side gap of the second-stage precast plate, and the protruding ends of the reinforcing members are fixed to the mounting holes, respectively, to form the second-stage precast plate. This is a method of reinforcing existing earth retaining slopes, which forms a reinforcing slope with a precast plate on the outer side of the earth retaining wall in multiple stages by connecting them integrally and repeating them in the upper stage.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a vertical sectional view showing reinforcement of an existing earth retaining slope by the construction method of this example, and a concrete precast plate used for it is shown in FIGS. 2 to 5. The precast plate 1 has a length of 2 m, a width of 1.5 m and a thickness of 1
It has a size of 0 to 15 cm and a mounting hole 10 in the center.
Is fixed in a state where the welded support rods 111 are connected to the longitudinal and horizontal reinforcing bars 13 and exposed to the back surface, and the attachment plate 11 is opened from the front surface to attach the mounting missing hole 14
And

In addition, the upper end surface has a shape of a protruding step 151 in the vertical direction so that it can be engaged with the protruding step 152 of the lower end surface, and one side surface of both side ends has a lateral engaging step 161.
Has a shape capable of engaging with the engaging step portion 162 on the other side surface. Further, the hanging hook metal fitting piece 17 is projected rearward to the lower step portion of the upper projecting step portion 151 and the hanging hole is formed. A hanging metal plate 18 through which 181 is provided protrudes downward from the lower protruding portion 152. A pair of the hanging hook metal piece 17 and the hanging metal plate 18 are attached above and below a half position between both ends and the center, and as shown in FIG.
The supporting bars 170 and 180 welded to them are respectively reinforced
3

The iron plates 191 and 192 for welding are exposed and arranged on both sides of the upper end of the precast plate 1, and the iron plates 193 and 1 are used for welding at the center of the lower end and both ends of the lower end.
94 and 195 are provided so as to project downward.

In the method of this example, first, the concrete precast plate 1 of the first stage is placed at the bottom of the stone wall 9 which is the existing earth retaining wall, and the precast plate 1 adjacent to the engaging step 161 on one side. The iron plates 191 and 192 that are engaged and abutted with the engagement step portion 162 on the other side are welded and arranged in parallel. A spacer 4 is interposed between the stone wall 9 and the precast plate 1 to secure a void 42 having an average width of about 5 cm. In order to prevent the precast plate 1 from tipping over, a wedge material holding the precast plate 1 may be driven into the stone wall 9 and held.

Next, as shown in FIG. 6, a hole drilling machine drills a hole drilling portion 5 of about 8 m through the stone wall 9 from the mounting hole 10 exposed to the mounting missing hole 14 of the precast plate 1. Then, as shown in FIG. 7, after inserting the deformed reinforcing bar 51 from the mounting hole 10 into the drilled hole portion 5, mortar 61 is injected into the drilled hole portion 5 from the mounting hole 10 and the stone wall 9 and the precast plate 1 are The mortar 62 is injected into the back space 42 from the lower end of the back surface of the precast plate 1 and grouted.

After the grout, as shown in FIG. 7, the mounting hole 1
A nut 53 is screwed to a screw end portion 52 of each deformed rebar 51 projecting to 0 through a washer and fixed to the mounting plate 11. Thereby, the deformed rebar 5 is integrally connected to the precast plate 1 via the nut 53, and the precast plate 1 is fixed to the stone wall 9 via the mortars 61 and 62. It should be noted that after the mortar has been injected into the attachment absent hole 14 in the front space portion of the attachment hole 10, the lid 141 of the concrete block is inserted and closed.

Then, as shown in FIG. 8, the second-stage concrete precast plate 1 is locked and temporarily fixed on the fixed lowermost precast plate 1. In this state,
The protruding portion 152 of the upper precast plate 1 and the protruding portion 151 of the lower precast plate 1 are engaged with each other, and the second precast plate 1 is engaged with the left and right engaging step portions 161, 162. As shown in FIG. 9, the iron plates 191 and 192 of the first-stage precast plate 1 are welded to the iron plates 193 and 194 of the second-stage precast plate 1 which are in contact with each other, and the second-stage precast plate 1 is Perform more reliable temporary fixing.
A space 42 is secured under the second-stage precast plate 1 with a spacer 4 interposed.

Similarly, a hole 5 is formed in the soil through the stone wall 9 from the mounting hole 10 of the second-stage precast plate 1.
Is drilled, the deformed bar 51 is inserted into the drilled portion 5, and mortars 61 and 62 are injected into the voids on the backside of the drilled portion 5 and the precast plate 1 in the same manner as described above. After the grout, nuts 53 are screwed onto the screw ends 52 of the respective deformed rebars 51 via washers, and mortar is injected into the mounting holes 14 and then the lid 14
By inserting 1 and closing it, the second precast plate 1 from the bottom is fixed to the stone wall 9 via the mortars 61 and 62.

Further, similarly, the concrete precast plate 1 is arranged at the third stage from the top (the uppermost stage in this embodiment) on the second stage precast plate so as to be in contact therewith.
91, 192, 193, 194, 195 are temporarily fixed in parallel by welding, and drill holes 5 are made through the stone wall 9 and deformed rebar 5
1, the mortar 61, 62 in the hole 5 and the back surface space.
After injection and curing, deformed rebar nut 53 stopper and lid 141
By repeating each of the steps of inserting and attaching, the reinforcing surface provided with the precast plates 1 in a plurality of stages is formed as shown in FIG.

According to the construction method of this example, the precast plate 1 is fixed to the outside of the stone wall 9, and the end of the deformed rebar 51 inserted into the hole 5 is fixed with the nut 53 to connect to the mounting plate 11. Since the rebar 51 can be integrally connected to the precast plate 1 to secure the fixing, the precast plate 1 is attached to the stone wall 9
The strong slope can be secured to the earth as a unit.

As described above, according to this example, since the precast plate is sequentially installed from the bottom to the top, the work is easy, and since the precast plate 1 is used, the precast plate can be fixed quickly and easily and the construction period can be shortened. . Further, since the earth retaining surface is a precast plate, the appearance is good, and the appearance can be further improved depending on the finish of the precast plate.

Although the construction method of this embodiment is constructed as described above,
The present invention is not limited to this. For example, the earth retaining material of the existing inclined surface to be reinforced is not limited, and stone blocks, block blocks, cast concrete, or the like may be used.
Further, the size, shape, and configuration of the precast plate are not limited, and the provisional fixing structure provided on the precast plate for arranging and joining and mounting them in parallel is also appropriate. 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.

Incidentally, it is also appropriate that the projecting end portions of the rod-shaped reinforcing members are fixed to each other by the mounting hole portions and integrally connected to the precast plate. Further, in the concrete precast plate, the number and position of the mounting holes through which the rod-shaped reinforcing material is inserted are not limited. Furthermore, the hole-drilling portion through which the rod-shaped reinforcing material is inserted does not necessarily have to pass through the existing earth retaining wall material, and when the earth retaining wall material is a stone material, the hole may be bored from the gap between the laminated layers.

[0018]

According to the method of the present invention, the precast plate is fixed with the existing earth retaining wall material as it is, and the end portion of the rod-shaped reinforcing material inserted into the hole is connected to the mounting plate. Since it can be integrally connected to the precast plate via the earth retaining wall material, the precast plate can be integrated with the earth retaining wall material to strongly retain the inclined surface. Also,
Since a precast plate is used, it can be fixed quickly and easily, the construction period can be shortened, the surface becomes a precast plate, and the appearance is good, and the appearance can be further improved depending on the finish of the precast plate.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an earth retaining surface having a main part extraction enlarged view showing an embodiment of the method of the present invention.

FIG. 2 is a rear perspective view showing an example of a concrete precast plate.

FIG. 3 is a partially sectional front view of the precast plate.

FIG. 4 is a vertical sectional side view of a main part of the precast plate.

FIG. 5 is a vertical cross-sectional plan view of a main part of the precast plate.

FIG. 6 is a vertical cross-sectional view showing a state in which a precast plate is arranged at the lowermost stage and holes are drilled.

[Fig. 7] Insert the deformed bar into the hole and grout it.
It is a longitudinal cross-sectional view of a state in which mortar is injected into the back surface of the precast plate.

FIG. 8 is a vertical cross-sectional view showing a state in which a second-stage precast plate is arranged and holes are drilled.

FIG. 9 is a rear view showing a state where the upper and lower precast plates are suspended and welded.

[Explanation of symbols]

 1 Precast 10 Mounting Hole 11 Mounting Plate 13 Reinforcing Bar 14 Mounting Missing Hole 141 Lid 42 Space 5 Drilling Hole 51 Deformed Bar 52 Screw End 53 Nut 61,62 Mortar 9 Stone Wall

Claims (1)

[Claims] 1. A concrete precast plate is provided at the outermost bottom of an existing retaining wall such as stone or concrete that is earth retaining on an inclined surface to be reinforced, with a small gap between the concrete precast plate and the outside of the retaining wall. After arranging, then a hole is drilled from the mounting hole formed transparently through the precast plate to the inside through the retaining wall, and a rod-shaped reinforcing member such as a reinforcing bar is inserted from the mounting hole into the drilled portion. Mortar is injected into the gap between the precast board and the retaining wall, and the protruding ends of the reinforcing materials are fixed to the precast boards by fixing holes at the mounting holes, respectively, and after the mortar is dried, the bottom step is fixed to the retaining wall. At the upper end of the precast plate of, the second precast plate is temporarily fixed with a gap between it and the outside of the retaining wall, and the retaining wall is installed through the mounting hole that is transparently installed in the second precast plate. And then drilling to the inside After inserting the rod-shaped reinforcing material into the drilled part from the hole, mortar is injected into the drilled part and the back side gap of the second-stage precast plate, and the protruding ends of the reinforcing material are fixed to the mounting holes, respectively. Cut slopes, etc. characterized by forming a reinforced inclined surface with multiple precast plates on the outside of the retaining wall by connecting it to the second stage precast plate and repeating this to the upper stage. Reinforcement method for existing earth retaining slopes in Japan.