JP6476095B2 - Reinforced soil integrated precast lattice frame method - Google Patents

Description

  The present invention relates to a reinforced soil-integrated precast grid frame construction method.

  In recent years, requirements for disaster resistance against large-scale earthquakes, heavy rains, etc. have been increasing by performance rank for natural mountain slopes, cut slopes, and embankment slopes of railways and road structures. .

  Therefore, re-evaluation regarding its safety has been carried out in various parts of the country, and the present invention is a new reinforced soil integrated precast grid that uses both "slope protection work" and "natural ground reinforced earth method" to meet these requirements. A frame construction method is provided.

Japanese Utility Model Publication No. 54-22304 Japanese Utility Model Publication No. 6-12534 Registered Utility Model No. 3026691 Japanese Patent Laid-Open No. 50-9905 JP-A-53-132110 JP 63-51525 A Japanese Patent No. 3499488 Japanese Patent No. 3605765 Japanese Patent No. 4318749

  If the natural ground or embankment is left as it is, surface collapse may occur due to erosion, surface peeling, sliding, weathering, sediment runoff due to spring water, etc. due to rainfall or earthquake. Therefore, "slope protection work" for various collapse factors has been proposed. In that case, a frame is often installed on the slope, and the frame is filled with crushed stone, concrete, mortar, soil, vegetation, etc. to stabilize the slope.

  On the other hand, considering the fact that torrential rains and guerrilla heavy rains have occurred frequently in recent years, and that large-scale earthquakes such as the Tokai, Tonankai, and Nankai earthquakes are expected to occur in the near future, It is highly possible that not only the above-mentioned surface layer collapse but also deep layer collapse at a deeper position will occur. Therefore, in such a case, a reinforcing material such as a rock bolt, medium diameter to large diameter reinforcing material, or ground anchor is inserted into the slope surface, and the tensile reinforcing effect, shear reinforcing effect, compression reinforcing effect of the reinforcing material. Various methods for reinforcing the slope using the above-mentioned methods (natural ground reinforced earth method) have been proposed.

  In particular, when it is used for excavation of loose slopes such as existing embankments and earth excavation and earth retaining work, it cannot be efficiently reinforced with reinforcing bars such as rock bolts. In application to the above, there is an increasing demand for durability and quality improvement of the reinforcing material. For this reason, a number of characteristic reinforcing materials have been proposed depending on the purpose of use, but at present, various types of reinforcing materials are roughly classified into three types of nailing, douring, and micropiling depending on the function of the reinforcing material.

  Here, nailing is a method of improving the stability of the natural ground mainly by the tensile resistance of the reinforcing material, and the diameter of the reinforcing material is about 10 cm or less. In comparison, the diameter and rigidity of the reinforcing material are large, and in addition to tensile resistance, bending and compression resistance can be expected. Further, since the douring is about 30 to 50 cm in diameter of the reinforcing material and has a large diameter and rigidity, it is used particularly on embankments and collapsible grounds where it is difficult to obtain a peripheral frictional resistance.

  By applying the mechanical mixing method to the typical method of douring, it is possible to construct a 30-50cm (generally 40cm) large-diameter reinforcing body depending on the ground conditions. There is a radish anchor method. The radish anchor method has a larger diameter than the nailing method. It is also applied to seismic reinforcement of walls and earthquake resistance / rainfall countermeasures for existing slopes.

  Furthermore, if the reinforcing material itself has almost no bending rigidity among the reinforcing materials used in the “natural ground reinforced earth construction method”, it is a method of expecting the tensile resistance of the reinforcing material. In this tensile reinforcement earth method, it is considered that an axial shearing force is generated on the surface of the reinforcing material as the soil is deformed, and as a result, a tensile force is passively generated in the reinforcing material.

  From the above background, in order to prevent the surface and deep layer collapse of the slope, or the progressive failure of these collapses, the above-mentioned "slope protection work" and "natural ground reinforcement earth method" should be used in combination. Although it is assumed that it can be an effective countermeasure method, at present, an appropriate combination of both has not been proposed in terms of on-site conditions, application range, safety, economic efficiency, and reinforcement effect.

  At present, the natural ground reinforcement, cut and fill slopes, etc., are often used as countermeasures against rainfall, heavy rain, and earthquakes. In many cases, “grid frame work” is performed.

  FIG. 6 is a diagram showing an implementation example of “place-placed lattice frame construction” used together with the conventional “natural ground reinforced earth construction method”, FIG. 6A is a schematic side view thereof, and FIG. It is a drawing substitute photograph which shows the latter state.

  In these figures, 101 is a natural ground, 102 is a cast-in-place lattice frame (on-site blown lattice frame, free frame (registered trademark), etc.), and 103 is a natural ground reinforcing material.

  When such a “place-in-place lattice frame work” is employed, the construction period is generally long and the construction cost is high. Further, as shown in FIG. 6B, the head of the natural ground reinforcing material 103 protrudes at the connection portion between the cast-in-place lattice frame 102 and the natural ground reinforcing material 103 used in the natural ground reinforcing earth method. Therefore, there were also problems on the landscape and safety.

  In view of the above situation, the present invention is effective in both countermeasures against surface and deep layer collapse of ground and slope surfaces by using the "slope protection work" and the "natural ground reinforcement earth method" in combination. In addition, a reinforced soil-integrated precast lattice frame that can speed up the construction and reduce the construction cost by making the “grid frame” a structure mainly composed of only two members of a coupling locking device and a beam member. The purpose is to provide a method of construction.

In order to achieve the above object, the present invention provides
[1] In the reinforced soil-integrated precast lattice frame construction method, a precast lattice frame is constructed by assembling a plurality of beam members, to which a connection locking device is attached in advance, on the slope of the natural ground, and the beam of the precast lattice frame is constructed. The ground contact side of the member is equipped with a bottom mortar filled with mortar in a geotextile bag, and a ground reinforcement is placed at the intersection of the precast lattice frame so that the head of this ground reinforcement is included. In the reinforced soil-integrated precast grid frame construction method, in which cast- in-place concrete is cast at the intersection of the precast grid frame, the ground retaining material is cast at the intersection of the precast grid frame. A corner cutting portion is provided to form a gap portion, and the gap portion is adjusted by adjusting a mounting position of the coupling locking device to the beam member. By adjusting the size, characterized in that it allows support for different natural ground reinforcing material diameters.

  [2] In the reinforcing soil-integrated precast grid frame construction method according to [1], the precast grid frame can be constructed only by connecting the beam member to which the connection locking device is attached. .

  [3] In the reinforcing soil-integrated precast grid frame construction method according to [1] or [2], the precast grid frame having different grid widths can be constructed only by adjusting the length of the beam member. To do.

  [4] In the reinforced soil-integrated precast lattice frame method according to [1] or [2], the geotextile bag body of the bottom-familiar mortar includes a beam member side and a ground surface side of the natural ground. By using two types of geotextiles having different properties, the adhesion between the precast lattice frame and the slope of the natural ground is further enhanced.

  [6] In the reinforced soil-integrated precast grid frame construction method according to [1] or [2], the head of the ground reinforcing material can be stored at the intersection of the precast grid frame. .

  [7] The reinforced soil-integrated precast grid frame construction method according to [1] or [2], wherein the connection locking device and the head of the ground reinforcing material are fixed.

  According to the present invention, the following effects can be achieved.

  (1) In the reinforced soil integrated precast lattice frame construction method, the construction of the “grid frame” is mainly composed of only two members, namely the connecting and locking device and the beam member, to speed up construction and reduce construction costs. Is possible.

  (2) Unlike the conventional “precast grid frame work”, by integrating the fixing part of the precast grid frame and the natural ground reinforcement material of the natural ground reinforcement earth construction method, the thin surface collapse of the slope surface is prevented. The effect equivalent to or better than that of “place-placed latticework” can be expected.

  (3) By adopting a structure in which the reinforcing material head can be accommodated at the intersection of the precast lattice frame, the reinforcing material head does not protrude, and the landscape and safety are superior.

  (4) A geotextile bag filled with mortar etc. is provided on the ground contact surface side of the beam member in order to enhance the adhesion between the precast lattice frame work and the slope surface ground mountain, and further the properties on the beam member side and the slope surface ground mountain side. By using two types of different geotextiles, it becomes possible to further enhance the adhesion to the slope surface mountain.

  (5) Comprehensively judging the above, unlike the conventional “placed-in-place lattice frame work”, the workability at the original position is improved, the work period is shortened, the quality is improved, and the construction cost is reduced. Is possible.

  (6) Basically, the “precast lattice frame” produced by the factory has dimensions and weight that can be constructed without using a large construction machine, so construction in a narrow place is possible.

It is a side view which shows the construction example of a precast lattice frame construction. It is a front view which shows the construction example of a precast lattice frame construction. It is a figure which shows a connection latching device. It is a figure which shows the beam member which attached the connection latching device. It is a figure which shows the assembly method of a reinforcement soil integrated type precast lattice frame construction. It is a figure which shows the example of enforcement of the "place cast lattice frame construction" used together by the conventional "natural ground reinforcement earth method".

  The reinforced soil-integrated precast grid frame construction method of the present invention constructs a precast grid frame by assembling a plurality of beam members, to which a connection locking device is attached in advance, on the slope of a natural ground, and the beam of the precast grid frame A ground mortar filled with mortar in a geotextile bag body is provided on the grounding surface side of the member, and a natural ground reinforcing material is placed at the intersection of the precast lattice frame so as to include the head of the natural ground reinforcing material. Next, cast-in-place concrete is placed at the intersection of the precast lattice frame.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a side view showing a precast lattice frame construction example, and FIG. 2 is a front view showing a precast grid frame construction example.

  In these drawings, 1 is a reinforced soil integrated precast lattice frame work, 2 is a natural ground, 3 is a beam member, 4 is a bottom-familiar mortar (filled in a bag), 5 is a natural ground reinforcement, and 6 is a connection lock The apparatus 7 is cast-in-place concrete (mortar etc.).

  In the reinforced soil-integrated precast lattice frame construction of the present invention, a precast lattice frame mainly composed of only two members, that is, the beam member 3 and the coupling locking device 6 is used. In this precast lattice frame, each member is produced at the factory, the beam member 3 to which the connection locking device 6 is attached in advance is carried into the field (slope surface of the natural ground 2), and the connection locking device 6 is attached. It is constructed by connecting and assembling the beam members 3 in the procedure described later. Thereafter, the ground reinforcing material 5 is placed at the intersection 5A of the precast lattice frame, and cast-in-place concrete is placed at the intersection 5A of the precast lattice frame so as to include the head of the ground reinforcement 5. To.

  Thus, in the reinforced soil-integrated precast grid frame construction of the present invention, the precast grid frame mainly composed of only two members is used, so that the construction can be speeded up and the construction cost can be reduced. The design of the lattice frame can be easily changed. For example, lattice frames having different lattice widths can be constructed only by adjusting the length of the beam member 3. Furthermore, since the components are produced at the factory and assembled after being brought into the site, the construction is easy and can be systematically constructed according to the site conditions, and the workability at the original location is improved.

  In the reinforced soil-integrated precast grid frame of the present invention, the grid frame intersection is not integrally formed as compared with the conventional “place cast grid frame (such as on-site blown grid frame)”. Since cast concrete (such as mortar) is cast and integrated, a high effect can be obtained in preventing surface layer collapse. When casting the cast-in-place concrete, since the head of the natural ground reinforcement material is included, the precast lattice frame and the natural ground reinforcement material can be easily integrated.

  In the precast lattice frame work of the present invention, the grounding surface of the beam member 3 has a structure having a geotextile bag (bottom-fitted mortar 4) filled with mortar and the like, and the precast lattice frame and the ground surface of the natural ground 2 are provided. Adhere closely. Thereby, even if there is a difference in unevenness on the slope of the natural ground 2, the slope of the precast lattice frame can be reliably adhered. In order to further improve the adhesion between the precast lattice frame and the ground surface of the natural ground 2, two types of geotextiles with different properties on the beam member side and the ground surface of the natural ground 2 are applied to the bottom familiar mortar 4 bag body. It can also be used. As the two types of geotextiles having different properties, it is only necessary to select one that can further enhance the adhesion between the beam member and the slope surface of the natural ground 2. For example, the geotextile 2 is relatively soft on the slope surface side. When a geotextile is used and a relatively hard geotextile is used on the beam member side, the adhesion between the precast lattice frame and the slope of the natural ground 2 can be further enhanced. As the geotextile bag body, one having a stitch that does not leak mortar filled therein is applied.

  The beam member 3 is a structure having bending and shear resistance against extraction of a mass of soil between the natural ground reinforcing materials 5.

  Further, joints and precast lattice frame intersections generated in the construction process are assumed to have the same or higher strength and rigidity as the beam member 3.

  FIG. 3 is a view showing a coupling locking device, FIG. 3 (a) is a three-dimensional view, 3 (b) is a front view, 3 (c) is a top view, 3 (d) is a bottom view, and 3 (e). Is a side view. Here, 6A is the front surface of the connection locking device, 6B is the back surface of the connection locking device, 6C is the top surface of the connection locking device, 6D is the bottom surface of the connection locking device, and 6E is the side surface of the connection locking device.

  In this figure, 11 is a convex part, 12 is a main body, 13 is a bottom part, 14 is a bolt fastening part, and 15 is a corner cutting part.

  FIG. 4 is a view showing the beam member to which the coupling locking device is attached. FIG. 4A is a top view of the beam member to which the coupling locking device is attached, and FIG. FIG.

  The connection locking device used in the precast lattice frame according to the present invention is attached to the beam member in advance and connected to each other to form an intersection of the precast lattice frames.

  In the connection locking device, as shown in the side view of FIG. 3E, the convex portion 11 and the main body 12 form a step, and the convex portion 11 of one of the connection locking devices is assembled during the connection assembly. Is engaged with the main body 12 of the other connecting and locking device, and can be connected. The main body 11 is provided with a corner cutting portion 15.

  FIG. 5 is a diagram showing a method for assembling the reinforced soil-integrated precast lattice frame. FIG. 5 (a) shows procedure 1, FIG. 5 (b) shows procedure 2, FIG. 5 (c) shows procedure 3, and FIG. ) Shows the procedure 4 respectively.

  In the procedure 1, the beam member (2) is moved in the direction of the arrow, and the projection 11 of the connection locking device attached to the beam member (2) and the body 12 of the connection locking device attached to the beam member (1). Are connected.

  In step 2, the beam member (3) is moved in the direction of the arrow, and the projection 11 of the connection locking device attached to the beam member (3) and the body of the connection locking device attached to the beam member (2). 12 are connected.

  In Step 3, the beam member (4) is moved in the direction of the arrow, and the projection 11 of the connection locking device attached to the beam member (1) and the body of the connection locking device attached to the beam member (4). 12 and the projection 11 of the connection locking device attached to the beam member (4) and the main body 12 of the connection locking device attached to the beam member (3) are connected.

  In the procedure 4, the bolts are tightened by the bolt fastening portions 14 of the connection locking device 6 at each connection portion, and the assembly of the precast lattice frame is completed.

  Thus, in the reinforced soil-integrated precast grid frame construction of the present invention, the precast grid frame is mainly constructed by only two members, that is, the beam member and the connecting and locking device.

  Further, by providing the corner cut portion 15 in the main body 12 of the connection locking device, a gap portion by the corner cut portion 15 is formed at the intersection portion of the precast lattice frame, and a post-construction ground reinforcing material is applied to the gap portion. By installing, the head of the natural ground reinforcement is accommodated in the intersection part of the precast lattice frame. Thereby, even after cast-in-place concrete placement, the head of the natural ground reinforcing material does not protrude, and the structure is superior in terms of scenery and safety. Furthermore, it is possible to cope with different diameters of the reinforcing material by adjusting the size of the corner cutting portion or adjusting the attachment position of the coupling locking device to the beam member.

  In addition, it is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.

  The reinforced soil-integrated precast lattice frame construction method of the present invention has a structure in which the “grid frame” is mainly composed of only two members of a coupling locking device and a beam member, thereby speeding up construction and reducing the cost of the members. It can be used as a reinforced soil-integrated precast grid frame construction method.

1 Reinforced soil-integrated precast lattice frame work 2 Chichiyama 3 Beam member 4 Bottom mortar (filled bag)
DESCRIPTION OF SYMBOLS 5 Ground-mount reinforcement 5A Intersection part of a precast lattice frame 6 Connection locking device 6A The front surface of a connection locking device 6B The back surface of a connection locking device 6C The upper surface of a connection locking device 6D The lower surface of a connection locking device 6E Connection locking device Side 7 Cast-in-place concrete (mortar, etc.)
11 Convex part 12 Body 13 Bottom part 14 Bolt fastening part 15 Corner cut part

Claims (6)

A precast lattice frame is constructed by assembling a plurality of beam members, to which a connecting locking device is attached in advance, on the ground surface of the natural ground, and a mortar is placed on the geotextile bag body on the grounding surface side of the beam member of the precast lattice frame. Filled bottom surface familiar mortar, cast ground reinforcement at the intersection of the precast grid frame, and cast-in-place concrete at the intersection of the precast grid frame to include the head of the ground cast reinforcement In the precast lattice frame construction method with reinforced soil
The connection locking device is provided with a corner cutting portion that forms a gap portion in which the natural ground reinforcing material is placed at the intersection of the precast lattice frame, and the connection locking device is attached to the beam member. A reinforced soil-integrated precast grid frame method characterized by adjusting the size of the gap portion by adjusting the position to enable support for natural ground reinforcing materials having different diameters .   The reinforced soil-integrated precast grid frame construction method according to claim 1, wherein the precast grid frame can be constructed only by connecting the beam member to which the connection locking device is attached. Precast lattice frame construction method.   The reinforced soil-integrated precast grid frame method according to claim 1 or 2, wherein the precast grid frame having different grid widths can be constructed only by adjusting the length of the beam member. Lattice frame construction method.   The reinforcing soil-integrated precast lattice frame construction method according to claim 1 or 2, wherein the geotextile bag body of the bottom-familiar mortar has two kinds of properties different on the beam member side and the ground surface side of the natural ground. A reinforced soil-integrated precast grid frame construction method that further enhances the adhesion between the precast grid frame and the ground surface of the natural ground by using a geotextile.   The reinforced soil-integrated precast grid frame construction method according to claim 1 or 2, characterized in that the head of the ground reinforcing material can be stored at the intersection of the precast grid frame. Frame construction method.   3. The reinforced soil-integrated precast grid frame construction method according to claim 1 or 2, wherein a head of the coupling locking device and the natural ground reinforcing material is fixed.

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