JP5065227B2 - Slope reinforcement method - Google Patents

Description

  The present invention relates to a construction method for reinforcing a slope, that is, a natural steep slope, a cut slope, or a slope having a surface protected construction.

  Conventionally, slope reinforcement methods include so-called `` reverse winding construction '' where a precast plate is installed in parallel at the uppermost end of the slope, and then the precast plate is installed in parallel on the lower end side. There is so-called “forward winding construction” in which precast plates are sequentially installed in parallel to the upper end side after being installed in parallel.

  The applicant of this application holds a patent related to the former “reverse winding construction” as a reinforcement method for stabilizing the cut slope, and its content is “from the top of the reinforced cut surface to be formed to the bottom. Forming a step by excavating the mounting surface high enough to install the first concrete precast plate toward the mounting surface, placing the precast plate in parallel on the mounting surface with a certain gap from the mounting surface, and then each precast plate After drilling in the mounting surface side from the mounting hole pierced through and inserting a rod-like reinforcing material such as a reinforcing bar into the drilled hole from the mounting hole, mortar is injected into the drilled hole and the back side gap of the precast plate After fixing the protruding end of the reinforcing material at the mounting hole and integrally connecting to the precast plate and fixing the precast plate to the mounting surface, the mounting surface of the height that can install the concrete precast plate in the second step from the top Excavated stage The second stage precast plate is connected to the lower end of the first stage precast plate with a gap between the mounting surface and the mounting surface side, and is cut from the mounting hole formed through the second stage precast plate. After inserting the rod-shaped reinforcing material from the mounting hole into the drilling hole, mortar is injected into the hole on the back side of the drilling section and the second-stage precast plate, and the protruding end of the reinforcing material is attached to the mounting hole section. A reinforcing method such as a cut slope, characterized by forming a reinforced cut surface having precast plates in a plurality of stages by being integrally connected to the second stage precast board and being repeatedly connected to the second stage. According to this patented invention, the construction of installing the precast plate at the same time as the earth retaining, that is, “reverse winding construction”, can reduce the private land width, reduce the amount of earth work, It can be shortened and the precast plate can be secured, so that it can be made highly reliable and can be made into a permanent structure, and since the slope is a precast plate, the appearance is good, and the aesthetics will be even better depending on the finish of the precast plate. The effect which can be done is large (for example, refer patent document 1).

  Further, in the slope reinforcement method in which the slope is reinforced with a precast plate and a reinforcing core material, a ground is excavated to form an upper stage installation surface, an upper stage precast board is installed on the upper stage installation surface, and a gap between the upper stage precast plate and the slope is formed. The back-casting material is filled in, the precast plate and the inclined surface are drilled from the surface of the upper precast plate to form an insertion hole, and a reinforcing core material is installed in the insertion hole simultaneously with or after the drilling, and the insertion After injecting a solidifying material into the hole and fixing the head of the reinforcing core material to the precast plate, excavating a natural ground below the upper precast plate to form a lower installation surface, the lower installation surface Newly installed the lower precast plate, in the same way as the upper precast plate, filling the backfill material, drilling the insertion hole, installing the reinforcing core material, injecting the solidifying material, fixing the head of the reinforcing core material, Lower stage mentioned above There is a slope reinforcement method that forms a reinforced slope by repeating a predetermined number of steps. According to this method, the gap between the slope and the backfill material is filled immediately after the precast plate is installed. Does not accumulate in the gap between the precast plate and the slope, and can eliminate the cause of void formation, so that the adhesion between the precast plate and the slope can be improved, and the invasion of water that causes corrosion of the reinforcing core can also be prevented. Since the backfill material is filled in the gap between the precast plate and the inclined surface at an early stage, a continuous insertion hole can be formed by drilling (see, for example, Patent Document 2).

Japanese Examined Patent Publication No. 7-26402 ([Claims], [Effects of the Invention], FIGS. 1 to 9) Japanese Patent No. 36060591 ([Claims], [Effects of the Invention], FIGS. 1 to 3)

However, in the patent invention of Patent Document 2 in the above prior art, the precast plate used in Patent Document 1 in which a mounting hole is formed in advance cannot be used. In that case, since it is simply filled with a solidifying material , there is little penetration into the natural ground side, so there is a problem that must be solved, such as having to cope with a deep hole in the drilling part and a long bar-shaped reinforcing material. there were.

The present invention is based on the above prior art, in view of the problem that the hole-drilling portion must be deepened and the rod-shaped reinforcing material must be lengthened, and the step of installing the precast plate on the slope, the back surface of the precast plate with the mounting hole closed, A step of injecting a backfilling material into the gap with the slope, a step of drilling the backfill layer from the mounting hole of each precast plate to the slope side, and a grout in the drilled portion formed in the drilling step. After the completion of both the step of injecting material , the step of inserting the rod-shaped reinforcing material into the drilled hole part before or after the grout material injecting step, and the step of injecting the grout material and the step of inserting the rod-shaped reinforcing material, each precast A pressure injection jig is fixed to the washer of the plate, and the grout material is pressure-injected into the hole from the inlet of the hole where the hole drilling means is pulled out, and the grout material is injected from the entire hole wall of the hole. and a step to infiltrate, of grout After the bio-curing, the precast plate used in Patent Document 1 can be used by using a method including a step of screwing and tightening a nut to the protruding end portion of the rod-shaped reinforcing material. By making more grout material penetrate into the natural ground side and improving the integrity with the natural ground side, the depth of the drilling portion and the length of the rod-shaped reinforcing material are made shorter and shorter than those of Patent Documents 1 and 2 above. To solve the above problems.

In short, the present invention includes a step of installing the precast plate on the slope, a step of injecting a backfill material into the gap between the back surface and the slope of the precast plate with the mounting hole closed, and a backside from the mounting hole of each precast plate. A rod-shaped reinforcing material is inserted in either the step of drilling the inclined layer through the filling layer, the step of injecting the grout material into the hole formed in the hole drilling step, or before or after the step of injecting the grout material. After completion of both the step of inserting into the hole drilling portion and the above-described grout material injection step and rod-shaped reinforcing material insertion step, the pressure injection jig is fixed to the washer of each precast plate, and the hole drilling means is pulled out. A process of injecting the grout material into the drilled hole from the inlet of the hole to infiltrate the grout material from the entire hole wall of the drilled hole, and after curing and hardening the grout material, a nut is attached to the protruding end of the rod-shaped reinforcing material. And screwing and tightening Therefore, by carrying out the drilling process after the backfilling material injection process in particular, as long as the mounting hole of the precast plate is closed, the drilling part is sealed, and the pressure injection jig which is the end of the pressure injection device Is attached not to the slope but to the precast plate installed on the slope, so that the applied pressure acts not on the slope but on the precast plate. Because the pressure injection process can expand the hole wall of the drilling part or allow more grout material to penetrate into the natural ground side, aim to improve the peripheral friction resistance against the natural ground side of the solidified grout material, Since the integrity with the natural ground side can be improved, a predetermined strength can be ensured even if the rod-shaped reinforcing material is made shallower and the bar-shaped reinforcing material is made shorter than the invention described in Patent Document 1, thus reducing the construction cost. Change Rukoto can be.

Since the above hole drilling step is performed by a hole drilling means having a casing, the grout material injection step can be smoothly performed by the casing, and the casing is pulled out before the grout material pressure injection step. Can surely penetrate into the natural ground.
In the above-described grout material pressure injection process, the pressure injection jig is fixed to the precast plate washer through the rubber packing by pressing with a hole drilling machine. Since there is no need to provide a fixing means for the pressure injection jig, it can be applied even if an existing precast plate (for example, the precast plate described in Patent Document 1) is used. .

FIG. 1 is a longitudinal sectional view of a reinforced cut surface by a reinforcing method such as a cut slope according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. It is a front view and FIG.3 (b) is AA sectional drawing of Fig.3 (a).
Each of the precast plates 1, 1 a has a rectangular shape and has a rectangular recess 2 at the center of the front surface, and a washer 3 is provided at the bottom of the recess 2, and a back surface continuous to the center hole 4 of the washer 3. And a cover body 6 that fits into the concave portion 2. The fixing means for the jig 16 for the pressurization injection process, which will be described later, specifically, four corners are provided. Bolt holes 7, 7a... Are formed in the part.

  4 (a) to 7 (b) are enlarged cross-sectional views of the main parts showing the respective steps of the reinforcing method such as a cut slope according to the present invention, a precast plate installation step, a backfilling material injection step, and a drilling hole. A process, a grout material injection process, a rod-shaped reinforcing material insertion process, a pressure injection process, a nut tightening process, and a cover body fitting process.

[Precast board installation process] (See Fig. 4 (a))
The precast plates 1, 1 a... Are arranged and fixed on the inclined surface 10 while ensuring a gap 11 between the inclined surfaces 10.

[Backfill material injection process] (See FIG. 4B)
The mounting holes 5 of the precast plates 1, 1 a... Are closed in advance by the lid body 8, and a backfill material such as cement milk or mortar is placed in the gap 11 to cure and harden the backfill layer 12. Form.
Specifically, a wooden or metal plate-like lid body 8 is accommodated in the concave portion 2, and a wooden bar 9 is fitted into the concave portion 2 and struck with a hammer or the like, whereby the lid body 8 is washed with a washer 3. The mounting hole 5 is closed in close contact with each other.

[Drilling process and grout material injection process] (See FIGS. 5A and 5B)
A hole drilling machine (not shown) penetrates the backfill layer 12 from the mounting hole 5 of each precast plate 1, 1a ... to form a hole drilling portion 13 having a predetermined depth on the slope 10 side (Fig. 5 (a)). For example, a grout material 14 such as cement milk or mortar is poured into the hole forming portion 13 (see FIG. 5B).
For example, drilling is performed by a drilling machine (not shown) while a casing C having a unit length and a drilling rod L are added, and then the grout material 14 is placed in the casing C from which the drilling rod L has been pulled out. Is filled in the hole drilling portion 13.

[Bar-shaped reinforcing material insertion step and pressure injection step] (see FIGS. 6A and 6B)
After the casing C is pulled out from the hole 13 into which the grout material 14 has been injected, a rod-like reinforcing material 15 such as a reinforcing bar is inserted (see FIG. 6A), and the washer 3 of each precast plate 1, 1a. After the pressure injection jig 16 is fixed by screwing bolts 17, 17 a into the bolt holes 7, 7 a..., Drilling is performed from the inlet of the hole drilling portion 13 by a pressure injection device (not shown). The grout material 14 is infiltrated into the natural ground M side by pressure-injecting the grout material 14 into the portion 13 (see FIG. 6B).

[Nut tightening step and cover body fitting step] (see FIGS. 7A and 7B)
After removing the pressure injection jig 16 from the washer 3, mortar 18 is embedded in the inlet side space of the drilling portion 13, and after the curing and hardening of the grout material 14 and the mortar 18, the washer is placed at the protruding end of the rod-shaped reinforcing material 15. 20 and a nut 19 are attached and the nut 19 is tightened (see FIG. 7A). Finally, the cover body 6 is fitted into the recess 1 of each precast plate 1, 1a (see FIG. 7B). )reference).

  In addition, although it is general and desirable that the hole making step is performed by the hole making means A using the casing C as described above, it is also possible to carry out by means of the hole making means not using the casing, although not shown.

  The rod-like reinforcing material inserting step in the reinforcing step is generally preferably performed after the grout material injecting step and before the pressure injecting step, but may be performed after the drilling step and before the grout material injecting step.

  As shown in FIG. 8, the pressure injection jig 16 and the washer 3 of each precast plate 1, 1a... Are fixed to the precast plates 1, 1a. With the rubber packing 21 interposed therebetween, the pressure injection jig 16 is pressed by the drilling machine H, so that the pressure injection jig 16 is attached to the rubber packing 21 and the rubber packing 21 is attached to the rubber packing 21. You may make it closely_contact | adhere to the washer 3 respectively.

In the precast plate installation process, on the drawing, the slope to be reinforced is a natural steep slope or a cut slope, and the slope 10 on which the precast plates 1, 1a,. In the “reverse winding construction” method, the slope 10 is excavated at a height that allows the first-stage precast plates 1, 1 a, etc. to be juxtaposed, and a step portion 20 is formed at the lower portion thereof. Plates 1 and 1a are arranged in parallel and fixed on the slope 10 by the steps after the precast plate installation step, and then the next slope 10 having a height that allows the precast plates 1 and 1a to be installed in the second stage from the top. By repeating the process of forming the next step 20 excavated and arranging the first precast plates 1, 1 a... In parallel and fixing on the next slope 10 by the above process, the precast plates are formed in a plurality of stages as shown in FIG. Forming a reinforced slope W with 1, 1a ... The
However, the slope to be reinforced is not limited to the cut slope, but can be applied to a slope that has already been protected by a block or the like. In this case, the slope on which the precast plates 1, 1a,. No. 10 is already formed over the entire surface, and the above steps are repeated upward from the lower end to form a reinforcing slope, so-called “forward winding construction”.

It is a longitudinal cross-sectional view of the reinforcement slope by the slope reinforcement construction method which concerns on this invention. It is a principal part enlarged view of FIG. It is a front view of a precast board. It is AA sectional drawing of Fig.3 (a). It is a principal part expanded sectional view which shows a precast board installation process. It is a principal part expanded sectional view which shows a backfilling material injection | pouring process. It is a principal part expanded sectional view which shows a drilling process. It is a principal part expanded sectional view which shows a grout material injection | pouring process. It is a principal part expanded sectional view which shows a rod-shaped reinforcement insertion process. It is a principal part expanded sectional view which shows a pressurization injection | pouring process. It is a principal part expanded sectional view which shows a nut fastening process. It is a principal part expanded sectional view which shows a cover body fitting process. It is a principal part expanded sectional view which shows the other Example of the fixation structure of the pressure injection jig | tool at the time of a pressure injection process.

Explanation of symbols

1, 1a ... Precast plate 3 Washer 4 Center hole 5 Mounting hole
10 slope
11 Clearance
12 Backfill layer
13 Drilling part
14 Grout
15 Rod reinforcement
16 Pressure injection jig
19 Nut
21 Rubber packing A Drilling means C Casing H Drilling machine

Claims (5)

It is a construction method using a precast plate having a mounting hole penetrating to the back side continuously to the central hole of the washer integrally fixed on the front side,
Installing the precast plate on the slope;
Injecting a backfilling material into the gap between the back surface and the slope of the precast plate with the mounting hole closed;
A process of drilling holes on the slope side through the backfill layer from the mounting holes of each precast plate,
Injecting a grout material into the hole formed in the hole drilling step;
Inserting the rod-shaped reinforcing material into the drilled hole part either before or after the grout material injecting step;
After completion of both the grout material injection step and the rod-shaped reinforcing material insertion step, a pressure injection jig is fixed to the washer of each precast plate, and the hole drilling means is pulled out from the inlet of the hole drilling portion into the hole drilling portion. Pressure injecting the grout material and infiltrating the grout material from the entire hole wall of the drilling portion ;
After the curing and curing of the grout material, a step of screwing and tightening a nut to the protruding end portion of the rod-shaped reinforcing material,
A slope reinforcement method characterized by having   In the precast plate installation process, after arranging a plurality of precast plates in the lateral direction at the upper end of the slope, the backfill material injection process, the drilling process, the grout material injection process, the rod-shaped reinforcing material insertion process, the grout material pressurization 2. The slope reinforcement according to claim 1, wherein the injection step and the nut tightening step are sequentially performed as a first step, and then the same step as the first step is sequentially performed on the lower end side of the slope. Construction method.   In the precast plate installation step, a plurality of precast plates are arranged in the lateral direction at the lower end of the slope, and then a backfilling material injection step, a drilling step, a grout material injection step, a rod-shaped reinforcing material insertion step, and a grout material pressurization. 2. The slope reinforcement according to claim 1, wherein an injection step and a nut tightening step are sequentially performed as a first step, and thereafter, the same step as the first step is sequentially performed on an upper end side of the slope. Construction method.   4. The slope reinforcing method according to claim 1, wherein the drilling step is performed by a drilling means having a casing, and the casing is pulled out before the pressure injection step of the grout material.   The pressurizing and injecting step of the grout material is characterized in that the pressurizing and injecting jig is fixed to the washer of the precast plate through a rubber packing by pressing with a drilling machine. Or the slope reinforcement construction method of 4 description.

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