JP5087523B2 - Construction method of reinforced soil retaining wall - Google Patents

Description

  In the construction of a reinforced soil retaining wall applied to many places including road retaining walls, retaining walls of site preparation sites such as parking lots and factories, retaining walls of earth dumping sites, restoration mountains dams, sabo dams, The present invention relates to a method for constructing a reinforced earth retaining wall that can prevent a worker from falling and can be safely performed.

  Conventionally, the wall material is expanded metal (net-like) for road retaining walls, retaining walls for site preparation sites such as parking lots and factories, retaining walls for dumping grounds, reinforced soil retaining walls applied to forestry dams, sabo dams, etc. A construction using a steel member is known (see Patent Document 1).

  Furthermore, in the embankment structure, a plate-shaped block wall surface material is used, a joint metal fitting and a sliding joint are provided between the upper and lower blocks, and the anchor member embedded in the reinforcing soil and the sliding joint are connected to each other. (See Patent Document 2).

Japanese Patent Laid-Open No. 08-284173 (paragraph 0013, FIGS. 1 and 4) JP-A-11-256580 (paragraph 0004, FIGS. 1 and 2)

  Each of the conventional techniques has the following problems. In the construction of the reinforced soil retaining wall, wall surface material installation and compaction work will be performed near the wall side (valley side) of the reinforced soil retaining wall, thus preventing falling to ensure safe and reliable work. It is necessary to plan.

  Conventionally, in many cases, construction work has been carried out without taking sufficient countermeasures, because safety measures are left to the independence of the contractor in spite of work at high places. When taking countermeasures, it is necessary to connect the single pipe from the bottom and construct a safety fence, so it is necessary to remove it after the construction is completed. In addition, there are problems that many single pipes are used and that it takes too much time to assemble and remove, which is too expensive.

  The present invention aims to solve the above-mentioned conventional problems, and a safety fence column support pipe that can be built in a wall is installed in advance, and the safety fence is installed at the construction stage of each embankment structure. Is a method to construct a reinforced earth retaining wall that can be easily constructed.

  In order to solve the above problems, the present invention is a method for constructing a reinforcing earth retaining wall in which a plurality of embankment structures are stacked on a bottom ground to form a reinforcing earth retaining wall, each of the above-mentioned plurality of earthing structures. Installs an L-shaped wall material consisting of a bottom surface part, a bent part and a front standing part on the bottom ground or lower level embankment structure, with the front standing part facing the wall side of the reinforcing earth retaining wall At the same time, laying a laying net material connected to the wall surface material, attaching a safety fence column support pipe vertically to the inner surface of the front standing part of the wall surface material, and embedding the embankment on the wall surface material and the laying net material After embedding and fixing the safety fence support pipe with embankment, attach the safety fence support pillar of the safety fence for falling prevention to the safety fence support pipe, further embed the embankment, and attach it to the safety fence support pipe The safety fence post of the safety fence is the safety fence of the embankment structure of the lower level Construction of a reinforced earth retaining wall characterized by attaching a safety fence column of a safety fence extracted from a column support pipe and transferring the safety fence in order when constructing the embankment structure from the lower level to the upper level. Provide a method.

  It is preferable to attach the upper part of the safety fence column support pipe to the inner surface of the front standing part of the wall material with a binding band or a wire.

  Preferably, the safety fence is formed by attaching handrails to the safety fence column so as to cross horizontally.

According to the structure of the construction method of the reinforced earth retaining wall according to the present invention as described above, the following effects are produced.
(1) Reinforcement of the embankment structure under construction Since the safety structure is attached to the wall surface (valley side) of the retaining wall, the embankment structure at each stage is built in sequence, preventing workers from falling. Workers can work with peace of mind, especially because the work can be done with confidence in the vicinity of the wall side of the embankment structure, eliminating the problems of deformation and settlement of the wall of the reinforced soil retaining wall due to lack of compaction. It becomes possible.

(2) In the construction of the upper level bank structure from the lower level bank structure, the same safety fences are installed while being replaced one after another, so the materials used are minimal and the removal work is eliminated. This will not only improve the cost, but also reduce labor and costs. This is particularly effective for construction work in mountainous areas where the cost of carrying materials is high. In addition, after the completion of the construction, the uppermost safety fence can be left as it is and used as a fall protection fence.

  The best mode for carrying out the method for constructing a reinforced soil retaining wall according to the present invention will be described in detail with reference to the drawings based on the embodiments.

  The construction method of the reinforced soil retaining wall according to the present invention is a construction method for constructing a reinforced soil retaining wall in a process in which a plurality of embankment structures are stacked on the bottom ground and the reinforced soil retaining wall is constructed without falling down. It is.

  The construction method of this reinforced soil retaining wall is that of the retaining wall of many places including road retaining walls, retaining walls of site preparation sites such as parking lots and factories, retaining walls of earth dumping sites, forest restoration dams, sabo dams. Although it is applicable to construction, here it demonstrates in detail in the Example applied to construction of the reinforced earth retaining wall of the front standing part of the inclined surface (slope surface) of a natural ground.

  First, the structure of the reinforced soil retaining wall to which the construction method of the reinforced soil retaining wall according to the present invention is applied and an outline of the construction method will be described. The slope 2 of the natural ground where the reinforced soil retaining wall 1 is constructed is cut off at a fixed slope angle to reveal the back cut, and the bottom ground 4 is formed forward from the bottom of the slope 2. In the construction method of the reinforced soil retaining wall 1 of the present invention, the reinforced soil retaining wall 1 is constructed by sequentially stacking the embankment structures 3 on the bottom ground 4.

  The embankment structure 3 to be stacked in a plurality of stages, to which the method for constructing the reinforcing soil retaining wall according to the present invention is applied, is basically constructed in almost the same process. First, the bottom embankment structure 3 Describe the construction process.

  A wall surface material 5 having an L-shaped cross section is installed on an end portion (a front end portion corresponding to the position on the left side of FIG. 1A) of the embankment structure 3 on the bottom ground 4 on the wall surface side (the valley side of the natural mountain). . As shown in FIG. 1B, the wall surface material 5 includes a bottom surface portion (horizontal portion) 6, a bent portion 7, and a front surface rising portion (standing portion) 8. The bottom surface portion 6 is placed on the bottom surface ground 4, and the front standing portion 8 is substantially perpendicular to the bottom surface ground 4 or toward the rear surface side (“mountain mountain side”, right side in FIG. 1 (a)). Are formed so as to be slightly inclined.

  As the wall material 5, a rigid expanded metal, a wire mesh, or the like is used. In this embodiment, an example in which a rigid expanded metal is used is shown. An oblique tie material 5 ′ is stretched between the front standing portion 8 and the bottom surface portion 6 of the wall surface material 5, and the wall surface material 5 is reinforced. A plurality of wall materials 5 are juxtaposed in the horizontal direction of the natural ground (in the horizontal direction when the natural mountain is seen from the front) according to the horizontal width of the reinforced earth retaining wall 1.

  The connecting material 10 such as a reinforcing bar is inserted alternately into the meshes of the bottom surface 6 of the wall surface material 5 and the connecting material 10 such as reinforcing bars is connected to each other. The laying net material 9 is laid from the bottom ground 4 to the inclined surface 2. The floor netting 9 is made of a geotextile, such as a tensor (trade name).

  A first-stage embankment structure 3 is constructed by embedding the embankment 11 while compacting the embankment 11 in a space surrounded by the wall surface material 5, the bottom ground 4, and the netting material 9 laid on the inclined surface 2. The reinforced soil retaining wall 1 is constructed by successively stacking the second and higher levels of the bank structure 3 on the first level of the bank structure 3.

  The second and higher levels of the embankment structure 3 are constructed by a process substantially similar to that of the first level of the embankment structure 3. That is, the wall material 5 disposed on the lower level banking structure 3 is installed, and the floor material 9 is connected to the wall material 5, and the wall material 5 is placed on the lower level banking structure 3. The embankment 11 is embedded while being compacted in a space surrounded by the laid netting material 9 and the laying net material 9 disposed on the inclined surface 2.

  It should be noted that the mountain side end portion of the laying net material 9 laid horizontally on the lower level embankment structure 3 is connected to the laying net material 9 laid on the inclined surface 2 alternately like a reinforcing bar. The material 12 is inserted and connected.

  In the method of constructing the reinforced soil retaining wall 1 as described above, the features of the construction method of the reinforced soil retaining wall 1 of the present invention are as follows. When constructing the embankment structure 3 at each stage, before embedding the embankment 11, the safety fence column support pipe 13 is attached to the back side of the wall material 5 at that stage. And when embedding the embankment 11 of the step, this safety fence support | pillar support pipe 13 is also embedded simultaneously, and it compacts. The safety fence column support pipe 13 embedded in the construction of the embankment structure 3 at each stage is left in the embankment structure 3 at each stage even after the construction of the reinforcing soil retaining wall 1 is completed.

  In this way, after embedding and embedding the embankment to a certain depth (depth to which the safety fence column support pipe 13 is fixed), the safety fence 14 is attached to the safety fence column support pipe 13, Safety such as prevention of falling of the worker during construction work of the embankment structure 3 of the step and the step immediately above is made possible.

  Such a characteristic construction method will be described in more detail. The safety fence 14 may be attached from the time of constructing the lowermost embankment structure 3, but from the time of constructing the embankment structure 3 at a certain height that is dangerous for work.

  FIG. 2 is an example in which the safety fence 14 is attached when the second-stage embankment structure 3 is constructed. In short, before embedding the second-stage embankment 11, the safety fence column support pipe 13 is attached to the back surface side (mountain side, right side in FIG. 2A) of the wall material 5 at that stage. Attach at intervals (for example, 2 m intervals) in the width direction.

  For example, a hollow pipe such as a resin pipe or a steel pipe is used as the safety fence column support pipe 13, and the length thereof is approximately the same as the height of the wall surface material 5. Alternatively, the length may be slightly higher than the height of the wall surface material 5. In the latter case, even if the step is completely buried with the embankment 11, it protrudes slightly upward from the embankment, so that the safety fence column 15 can be easily pulled out from the safety fence column support pipe 13 as described later.

  As shown in FIG. 3, the safety fence column support pipe 13 is attached to the wall surface material 5 by binding the upper part of the safety fence column support pipe 13 with a binding band 16 or a wire, and within the lower end opening of the safety fence column support pipe 13. The support bolt 17 is inserted and attached for positioning from below, and simple attachment such as temporary fixing may be used. The reason is that the safety fence column support pipe 13 is firmly fixed in the soil by the embankment 11 embedded in the step.

  The support bolt 17 is placed on the lower level embankment structure 3 so as to extend upward through the bottom surface portion 6 of the wall surface material 5, and the safety fence column support tube 13 is placed in the lower end opening thereof. Position the support bolt 17 so that it is inserted.

  After the safety fence column support tube 13 is attached to the back surface side of the wall surface material 5, as shown in FIG. Then, after filling the embankment to a depth that allows the safety fence column support tube 13 to be firmly fixed by the embankment 11 (for example, about half the depth of the embankment structure 3 at that stage), The safety fence column 15 is inserted into the fence column support tube 13.

  A safety fence cross member 18 is horizontally attached to the safety fence column 15 so as to intersect in the horizontal direction (lateral width direction) when viewed from the front of the embankment structure 3 on the mountain side. The safety fence cross member 18 (handrail) may be a steel pipe or the like, but is attached in the vertical direction by one row or two or more rows at intervals. In this embodiment, as shown in FIG. 4, a configuration in which two rows of safety fence cross members 18 are attached in the vertical direction is shown.

  FIG. 2 (b) shows that the construction of the second-stage embankment structure 3 is completed in a state where the safety fence 15 is installed on the second-stage embankment structure 3, and the third-stage embankment in the upper level. Similarly, in the structure, a state in which the safety fence column support pipe 13 is attached and the embankment 11 is embedded while being compacted is shown.

  Once the safety fence cross member 18 is attached to the safety fence column 15 to form the safety fence 14, the safety fence 14 used in the lower level embankment structure 3 as shown by the arrow in FIG. Are pulled out from the safety fence column support pipe 13 and inserted into the safety fence column support pipe 13 buried in the embankment structure 3 of the upper level, thereby being sequentially transferred and attached.

  In short, the common safety fence 14 is sequentially transferred and attached from the construction work of the lower embankment structure 3 to the construction work of the lower embankment structure 3. Therefore, since it is not necessary to attach the safety fence 14 to the multi-level embankment structure 3, neither the work nor the material for attaching the cross member 18 to each step is necessary. This is a very unique feature of the construction method of the reinforced earth retaining wall of the present invention. In addition, the safety fence support | pillar support pipe 13 embedded in the construction of the embankment structure 3 of each step is left in the embankment structure 3 of each step even after the construction of the reinforcing soil retaining wall 1 is completed.

  FIG. 6 is a diagram showing the safety fence 14 for preventing falling formed as described above. FIG. 6 shows that when a banking structure 3 of a certain level is constructed, a safety fence column support pipe 13 is attached to the wall surface material 5 and the bank 11 is filled while being compacted to the middle of the level, and then the safety fence column support pipe 13 is filled. The state which inserted the safety fence support | pillar 15 in the inside and attached the safety fence 14 is shown.

  In addition, although the laying net material 9 appears to be exposed at a part on the right side in FIG. 6, this is for the sake of easy understanding of the configuration of the embankment structure 3, and in a state where the safety fence 14 is attached. Since the embankment 11 has already been incorporated, the netting material 9 is not actually exposed.

  Thus, when the safety fence 14 is attached to the wall surface side (valley side) of the reinforcing soil retaining wall 1 of the embankment structure 3 under construction, the worker can be prevented from falling, and the worker can work with peace of mind. Since the compaction work in the vicinity of the wall surface side of the embankment structure 3 can be performed with peace of mind, problems of deformation and settlement of the wall surface of the reinforced soil retaining wall 1 due to lack of compaction, which have occurred in the past, are solved.

  Furthermore, according to the construction method of the reinforced soil retaining wall of the present invention, the amount of materials used is minimal, and the dismantling / removing work of the safety fence 14 in the embankment structure of each step is eliminated, so that not only the safety is improved but also the cost is reduced. Can be expected to be reduced. Further, after the construction is completed, the uppermost safety fence 14 can be left as it is and used as a fall protection fence if necessary.

  As mentioned above, although embodiment of the construction method of the reinforced earth retaining wall which concerns on this invention was described based on the Example, this invention is not specifically limited to such an Example, The technique as described in a claim It goes without saying that there are various embodiments within the scope of the subject matter.

  The construction method of the reinforced soil retaining wall according to the present invention is as described above. The road retaining wall, the retaining wall of the site preparation site such as a parking lot or a factory, the retaining wall of the earth dumping site, the natural mountain dam, the sabo dam It can be applied to the construction of reinforced soil retaining walls in many places, and it is an extremely useful construction method to prevent the operator from falling and to ensure safe work.

(A) is sectional drawing explaining the outline | summary of the construction method of the reinforced earth retaining wall used as the premise of this invention, (b) is a side view explaining a wall surface material. (A), (b) is sectional drawing explaining the construction method of the reinforced earth retaining wall which concerns on this invention. It is a perspective view explaining the principal part of the reinforced earth retaining wall which concerns on this invention. It is a perspective view explaining the process in the middle of the construction method of the reinforced earth retaining wall which concerns on this invention. It is a perspective view explaining the process in the middle of the construction method of the reinforced earth retaining wall which concerns on this invention. It is a figure which shows the perspective view of the safety fence of the reinforced earth retaining wall which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforced soil retaining wall 2 Inclined surface of natural ground 3 Embankment structure 4 Bottom ground 5 Wall material 5 'Diagonal tie material 6 Bottom part (horizontal part)
7 Folding part 8 Front standing part (standing part)
9 Laying Net Material 10, 12 Connecting Material 11 Filling 13 Safety Fence Post Support Pipe 14 Safety Fence 15 Safety Fence Post 16 Tying Band 17 Support Bolt 18 Safety Fence Horizontal Material (Handrail)

Claims (3)

A method for constructing a reinforced soil retaining wall that forms a reinforced soil retaining wall by stacking a plurality of embankment structures on the bottom ground,
Each of the multi-level embankment structure is composed of an L-shaped wall material consisting of a bottom surface portion, a bent portion and a front erection portion on the bottom ground or a lower level embankment structure, and the front erection portion is reinforced soil. Installed toward the wall surface side of the retaining wall, laying a laying net material connected to the wall surface material, and attaching the safety fence column support pipe vertically to the inner surface of the front standing part of the wall surface material. After embedding the embankment on the laying net material and fixing the safety fence column support pipe with the embankment, install the safety fence column of the safety fence to prevent falling to the safety fence column support pipe, and further embed the embankment,
The safety fence support column of the safety fence attached to the safety fence support column is attached to the safety fence support column extracted from the safety fence support tube of the lower level embankment structure. A method for constructing a reinforced soil retaining wall, which is constructed by sequentially transferring and installing the embankment structure of the next step.   The construction method of the reinforced earth retaining wall according to claim 1, wherein the safety fence column support pipe is attached to the inner surface of the front standing portion of the wall material with a binding band or a wire.   3. The method for constructing a reinforcing earth retaining wall according to claim 1 or 2, wherein the safety fence is formed by attaching handrails to the safety fence column so as to cross horizontally.