JP4390241B2 - Construction method using on-site casting frame and rock bolts and spray casting frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slope stabilization method, and more particularly to a slope stabilization technique using a spot casting frame and a lock bolt in combination. In this specification, the term “lock bolt” includes a ground anchor.
[0002]
[Prior art]
A frame work is used as one of the slope stabilization methods. In this method, a grid-like frame is placed on the ground slope with concrete (or mortar). When forming this method frame, for example, reinforcing bars are arranged between a pair of wire mesh frames to form a method frame mold, and concrete is sprayed into the method frame mold by air pressure.
[0003]
On the other hand, a rock bolt or a ground anchor may be used for slope stabilization. In this method, the slope is drilled, a lock bolt or anchor body is embedded, and grout is injected and fixed. The lock bolt is fixed in the ground along its entire length and is fixed to the slope via a washer or a concrete bearing plate without applying a tensile force as it is. The ground anchor is fixed to the slope through the bearing plate in a state in which the tip end portion of the anchor body is fixed and the free length portion is pulled and tensioned.
[0004]
When such lock bolts or ground anchors (hereinafter simply referred to as “lock bolts”) are used together with the frame work, the lock bolts are buried at the intersections of the grid-like frame made up of the vertical and horizontal frames. The head of the lock bolt is fixed to the frame with the support plate. In this case, in order to secure a lock bolt insertion hole in the legal frame, a hole mold frame for forming a lock bolt insertion hole is provided at the intersection of the legal frame mold, and a method outside the hole mold frame is provided. Concrete is sprayed into the frame formwork. As such a hole formwork, a PVC pipe, a void pipe such as paper, a steel pipe or the like has been conventionally used.
[0005]
[Problems to be solved by the invention]
However, with the conventional rock bolt hole formwork, when concrete is sprayed, air does not escape through the tube wall of the hole formwork. . In order to prevent the formation of such nests, time-consuming and careful concrete spraying work was forced, and as a result, the spraying work at the intersection was troublesome and time-consuming.
[0006]
In addition, since the conventional hole mold has a smooth surface, it is difficult to fix the frame to the frame for the frame when it is installed in the field. Cheap. In order to prevent such a positional shift, it has to be fixed sufficiently firmly with a binding wire or the like, and the fixing work is troublesome and troublesome, and the workability is poor.
[0007]
The present invention is based on the above prior art, and suppresses air entrainment when spraying concrete or mortar, and is easy to mount the hole mold and firmly fixed without causing displacement. It is an object of the present invention to provide a possible on-site method frame and a construction method using lock bolts, and a spray casting method frame form used in the construction method .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a frame for forming a lock bolt is formed in the intersection of the frame for forming a frame by assembling the frame for a frame in the field and forming a hole for inserting a lock bolt. in the construction method of cast-in-place method frame and lock bolt combination for pouring by blowing a concrete or mortar on the outside of the process frame mold frame within this grooved frame, the grooved frame Ri Do a porous material, When concrete or mortar is blown into the formwork frame outside the hole formwork, air blown into the concrete or mortar is released through the porous material constituting the hole formwork. And projecting the concrete or mortar sprayed through the porous material constituting the hole mold into the hole mold to form a protrusion, and filling the hole mold with the protrusion Lock bolt fixing grau Characterized in that to achieve integration of the wood.
[0009]
According to this configuration, since the hole mold for the lock bolt is made of a porous material such as a wire mesh, the perforated plate constituting the side surface of the hole mold when spraying concrete or mortar on the outside of the hole mold Since air escapes to the inside of the hole formwork through the holes (openings), the concrete in the outer formwork form becomes solid concrete, and a stable formwork with no strength and no nest is obtained.
[0010]
Also, the concrete or mortar sprayed through the porous material constituting the hole mold forms a convex part by projecting to the inside of the hole mold, and the lock bolt is filled into the hole mold by the convex part. Integration with the fixing grout material is achieved. Further, since the hole mold is a perforated plate, the hole mold can be easily and securely fixed to the frame for the legal frame through the binding wire in the hole of the perforated plate, and the workability on the site is improved. Figured.
[0011]
In a preferred configuration example, disposed reinforcing bars on both sides inside the top and bottom of each of the Law frame for formwork, passing them over connection frame member between upper and lower respective rebar, the connecting frame member of the upper and lower It is characterized by bundling the hole formwork for.
[0012]
According to this configuration, the hole mold frame is firmly fixed and held on the reinforcing bar in the frame for the frame by way of the connection frame material, and the connection frame material functions as a reinforcing bar and is formed on the frame. The insertion hole portion for the lock bolt can be reinforced. Furthermore, in the present invention, it is a frame for a method frame that is assembled in a lattice shape at the site, and includes a hole mold frame made of a porous material that forms a hole for inserting a lock bolt at an intersection of the frame for the method frame, The pore size of the porous material constituting the hole mold is set so that air can pass therethrough and concrete or mortar slightly enters and a convex portion is formed inside the hole mold. When the concrete or mortar is blown into the form frame for the outside of the frame, the air entrained in the concrete or mortar escapes through the porous material constituting the hole form frame and forms the hole form frame. Concrete or mortar sprayed through a porous material that protrudes to the inside of the hole mold forms a convex part, and a rock bolt fixing grout material filled in the hole mold frame by the convex part To be integrated To provide a spray hitting設用method frame for the mold that form. According to this configuration, when the hole mold is assembled in the field frame mold in the field, the hole mold is made of a porous material such as a wire mesh, so that it is easily fixed and held at a predetermined position by a binding wire or the like. When concrete or mortar is sprayed into the legal form mold outside the hole mold, air escapes to the inside of the hole mold through the holes (openings) of the perforated plate constituting the side surface of the hole mold. Therefore, the concrete in the outer formwork frame becomes a solid concrete, and a stable formwork with strength without occurrence of nests is obtained. Furthermore, a grout for fixing a lock bolt in which the concrete or mortar sprayed through the porous material constituting the hole mold is projected into the hole mold and is filled into the hole mold by a convex portion. Integration with the material is achieved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which (A) is a top view, and (B) and (C) are side views of a hole formwork installation portion when the unevenness is small and large, respectively. In addition, (A) shows the intersection part of a lattice-like method frame, and (B) and (C) show only a part of the vertical frame side surface that continues along the slope.
[0014]
As shown in (A), a frame 1 for a legal frame according to the present invention is a pair of wire mesh frames made of a mesh-shaped frame material such as a crimp wire mesh, and a vertical frame 2 and a horizontal frame 3 are formed in a lattice shape. Then, two vertical reinforcing bars 4 and five horizontal reinforcing bars 5 are arranged on the inner side of each of the metal mesh frames of the vertical frame 2 and the horizontal frame 3 on both sides thereof (total of four vertical and horizontal bars respectively). A pair of wire mesh frames facing each other in the vertical frame 2 and the horizontal frame 3 are connected to each other at a predetermined opposing interval by, for example, a well-shaped connecting spacer (not shown) arranged at an appropriate interval. The reinforcing bars 4 and 5 are bound to the connecting spacer. Further, a stirrup (not shown) for reinforcement may be attached to the vertical and horizontal reinforcing bars 4 and 5.
[0015]
A hole mold 6 for forming an insertion hole for inserting a lock bolt is provided at the intersection of the vertical frame 2 and the horizontal frame 3. As will be described later, this perforated frame 6 is made of a porous material such as a wire mesh, and is connected to upper and lower vertical reinforcing bars 4 and horizontal reinforcing bars 5 by using a cross-girder-like connecting frame member 7 made of reinforcing bars in two upper and lower stages. Is done. Concrete is sprayed to the outside of the hole mold 6 in the mold 1 for the frame. At this time, air escapes to the inside of the hole mold 6 through the mesh of the hole mold 6, so that it is not caught in the concrete frame.
[0016]
The material and shape of the connecting frame material 7 are not particularly limited as long as the hole frame can be firmly fixed to the reinforcing bar. For example, the wire material may be bent to provide unevenness, or may be a resin material provided with fiber reinforced unevenness, or the wire material made of the same material as the reinforcing bar may be combined in various shapes as shown in FIG. Good.
[0017]
When the frame 1 for the frame is installed on the slope, if the unevenness is small, it is installed on the slope as it is as shown in (B). In this case, a slight gap (not shown) is formed on the lower side of the wire mesh frame, but the concrete is sprayed while being covered with an appropriate material when the concrete is placed. When the unevenness is large, as shown in (C), a wire mesh 2a is added to the lower side of the wire mesh frame having a predetermined shape in accordance with the unevenness. In this case, as will be described later (FIG. 4), the hole molds 6 are overlapped and slid with different diameters, or those with the same diameter are connected with a binding wire or the like, so that the gap between the normal frame and the ground is large. Adjustments can be made accordingly.
[0018]
FIG. 2 is a top view and a side view of the hole mold according to the present invention. The hole form 6 through which the lock bolt according to the present invention is inserted is formed of a porous material in order to prevent air entrainment when spraying concrete or the like. This may be formed into a cylindrical shape as shown in (A) or a conical taper shape as shown in (B) using a wire mesh (welding wire mesh, crimp wire mesh, turtle shell wire mesh, etc.).
[0019]
Moreover, as shown to (C) and (D), it is good also as a cylindrical shape using the punching metal, the expanded metal, etc. which opened many round holes and square holes in the steel plate. In addition, it is good also as a cylindrical shape using the rigidity which can endure spraying pressure, and the material which does not generate | occur | produce rust easily. For example, a resin (fiber reinforced plastic (FRP)) is suitable for concrete because its linear expansion coefficient is close to that of iron. In addition, although it is cylindrical in the figure, any shape such as a rectangle or other rectangular tube shape may be used as long as a predetermined hole diameter can be secured.
[0020]
The mesh (mesh size) of the holes in the steel plate and the mesh is appropriate so that the air escapes when the concrete is sprayed, and the sprayed concrete, etc. is caught by the mesh, etc., so that some protrusions can enter the inside. (For example, about 10 × 27 mm). The mesh may be adjusted by combining wire meshes or perforated steel plates having different meshes. As a result, air can be prevented from being entrained when spraying concrete, etc., and the concrete protrudes into the hole from the mesh of the wall surface of the insertion hole of the lock bolt, and the concrete and the grout material for fixing the lock bolt are integrated. can get.
[0021]
A projecting piece 8 formed by cutting a wire mesh wire or a steel plate is provided at the bottom of the hole mold 6. When the frame 1 for the frame is installed on the slope, the insertion of the position of the lock bolt insertion hole due to the spraying pressure of concrete or the like can be prevented by inserting the protruding piece 8 into the ground.
[0022]
FIG. 3 is a schematic view of the cap of the hole mold. The cap 9 is attached to the upper part of the hole mold 6 with a binding wire or the like, and prevents the concrete or the like from entering the hole when the concrete or the like is sprayed. As the shape, as shown in (A), the upper part is closed and the hook 10 is attached, or as shown in (B), the upper part is closed and the hole 11 is open. In this case, a wire or the like (not shown) is attached to the hole 11. After spraying concrete or the like, pull the hook 10 or wire to remove the cap 9. As shown in (C), a cap 9 having an opening at the top may be attached to the hole mold 6 and the opened portion may be closed with gum tape or the like (not shown).
[0023]
In any case, the upper portion of the cap 9 is formed in accordance with the drilling angle corresponding to each site situation. In the case where the drilling angle cannot be established, the upper part of the hole mold 6 may be closed with gum tape or the like to prevent intrusion of concrete or the like.
[0024]
FIG. 4 is a schematic view when adjusting the length of the hole mold. As shown in FIG. 1 (C), when installing a frame 1 for a legal frame on a slope with a large uneven surface, etc. It is necessary to adjust the length (height) of the hole mold according to the height of the legal form. In this case, as shown in (A), the hole mold 6 is connected to the same diameter with a binding wire or the like to adjust the length as shown in (A), or the diameter is different as shown in (B) (about 10 mm in diameter). It is also possible to prepare a hole formwork, slide it to adjust its length, and connect it with a binding wire or the like.
[0025]
FIG. 5 is an assembly drawing of a form frame for a legal frame. In this embodiment, the mold is assembled first. As shown in (A), the lower rebar 12 is installed on the slope, and as shown in (B), a pair of wire mesh frames 15 are connected by a well-shaped connecting spacer 16 to connect the vertical frame 2 (horizontal frame 3). ) Is set. Next, as shown in (C), the upper reinforcing bar 13 is installed on the connecting spacer 16, and the upper and lower reinforcing bars 12, 13 and the connecting spacer 16 are fixed to each other with a binding wire or the like. Next, as shown in (D), at the intersection of the vertical frame 2 and the horizontal frame 3, it is fixed to the upper and lower reinforcing bars 12, 13 by the connecting frame material (fixing jig) 7 in the upper and lower rows made of a reinforcing bar material. To do. The hole mold frame 6 is inserted into the upper and lower connecting frame members 7 and fixed with binding wires.
[0026]
Alternatively, the hole mold 6 may be disposed first, and the connecting frame member 7 may be attached so as to be sandwiched from the periphery of the hole mold 6 in a disassembled state. Alternatively, the lower connecting frame member 7 is first placed on the lower rebar, the hole mold frame 6 is disposed through the lower connecting frame member 7, and then the upper connecting frame member 7 is placed on the hole mold frame 6. And finally the upper and lower connecting frame members 7 and the reinforcing bars and the hole mold frame may be fixed with binding wires. At this time, since the hole form frame 6 is a porous material such as a wire mesh, the hole form frame 6 and the connecting frame material 7 can be bound by a binding wire through the mesh, and the bundling operation can be performed easily and reliably. As a result, there is no risk of displacement or the like, and a highly reliable lock bolt insertion hole can be obtained.
[0027]
FIG. 6 is another assembly drawing of a form frame for a legal frame. In this embodiment, the reinforcing bars are assembled first. As shown in (A), the upper and lower reinforcing bars 12 and 13 are fixed with a stirrup 14 to form a reinforcing bar frame, which is disposed in the vertical and horizontal directions. Next, as shown in (B), the perforated frame 6 is mounted at the intersection of the vertical and horizontal reinforcing bar frames using the connecting frame material 7 in the same manner as in FIG. Next, as shown in (C), the metal mesh frame 15 is provided on both sides of the reinforcing bar frame to form the vertical frame 2 (horizontal frame 3).
[0028]
FIG. 7 is a schematic view of a connecting frame member (fixing jig) 7 for fixing the hole mold. As described above, the connecting frame member 7 is used when the hole mold 6 is fixed to the reinforcing bars 4, 5, 12, and 13. As shown in FIG. 2A, the hole form frame 6 can be sandwiched with opposing square-shaped reinforcing bars facing each other. Or as shown to (B), a reinforcing bar material may be assembled in the shape of a cross beam, and each intersection part may be connected with a ring mutually, and it may comprise so that it can fold. The hole mold 6 is fitted inside with the connecting frame member 7 expanded as shown in the figure.
[0029]
As shown in (C), the connecting frame member 7 may be formed by using a portion in which the reinforcing bar material is opposed and the hole frame 6 is sandwiched so as to form a substantially arc shape along the hole frame 6. Moreover, as shown in (D), you may attach a reinforcing bar material in order so that it may become a grid | lattice form. In this case, the reinforcing bars may be preliminarily assembled in a cross-beam shape with a binding wire. There use the reinforcing bar having a reinforcing steel and as strong formwork as a connecting frame member, by bundling put it on rebar Howaku intersections, concrete defects by the lock bolt insertion hole formed in the intersection point Can be sufficiently reinforced.
[0030]
【The invention's effect】
As described above, in the present invention, since the hole mold for rock bolts is made of a porous material such as a wire mesh, when concrete or mortar is sprayed on the outside of the hole mold, the side surface of the hole mold is removed. Since air escapes through the holes (openings) of the perforated plate that forms the inside of the hole formwork, air is prevented from being caught, so the concrete or mortar inside the outer formwork form is in a solid state Thus, a strong and stable frame without nest formation is obtained.
[0031]
In addition, since concrete or mortar sprayed through the porous material constituting the hole mold protrudes to the inside of the hole mold to form a protrusion, the lock filled in the hole mold by the protrusion Integration with bolt fixing grout material is achieved. Further, since the hole mold is a perforated plate, the hole mold can be easily and securely fixed to the frame for the legal frame through the binding wire in the hole of the perforated plate, and the workability on the site is improved. Figured.
[0032]
In addition, the hole mold is firmly fixed and held on the reinforcing bar in the frame for the legal frame via the coupling frame material, and the coupling frame functions as a reinforcing bar for the lock bolt formed on the frame. The insertion hole portion can be reinforced.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, in which (A) is a top view, and (B) and (C) are side views of a hole formwork installation part when the unevenness is small and large, respectively.
FIG. 2 is a top view and a side view of a hole mold according to the present invention.
FIG. 3 is a schematic view of a hole form cap.
FIG. 4 is a schematic view when adjusting the length of a hole mold.
FIG. 5 is an assembly drawing of a formwork frame.
FIG. 6 is another assembly drawing of a formwork frame.
FIG. 7 is a schematic view of a connecting frame member (fixing jig) for fixing a hole mold.
[Explanation of symbols]
1: frame for frame, 2: vertical frame, 3: horizontal frame, 4: vertical reinforcing bar, 5: horizontal reinforcing bar, 6: hole mold, 7: connecting frame material, 8: protruding piece, 9: cap, 10 : Hook, 11: hole, 12: lower rebar, 13: upper rebar, 14: stirrup, 15: wire mesh frame, 16: connecting spacer

Claims (3)

Assemble the formwork frame in the form of a lattice at the site, and provide a hole formwork for forming a hole for inserting a lock bolt at the intersection of the formwork frame. The formwork outside the hole formwork in the construction method of cast-in-place method frame and lock bolt combination for pouring by blowing the concrete or mortar to use formwork in the bore formwork Ri Do a porous material, for the method frame outside the grooved frame When blowing concrete or mortar into the mold, the air entrained in the concrete or mortar is blown while being released through the porous material constituting the hole mold, and the hole mold is configured. Concrete or mortar sprayed through a porous material is protruded to the inside of the hole mold to form a convex part, and the rock bolt fixing grout material filled in the hole mold by the convex part. characterized in that to achieve integration Construction method of the field and eject method frame and the lock bolt combination. Disposed reinforcing bars on both sides inside the top and bottom of each of the Law frame for formwork, passing them over connection frame member between upper and lower respective rebar, the caliber for the connecting frame member of the upper and lower cast in place process frame and the construction method of the lock bolt combination according to claim 1, characterized in that the binding frame. A frame for a frame that is assembled in a lattice form on site, and is provided with a hole frame made of a porous material that forms a hole for inserting a lock bolt at an intersection of the frame for the frame. The size of the pores of the porous material to be configured is set so that air can pass through and concrete or mortar slightly enters and the convex portions are formed inside the hole mold frame, and the method outside the hole mold frame When concrete or mortar is sprayed into a formwork for a frame, air entrained in the concrete or mortar escapes through the porous material constituting the hole mold and through the porous material constituting the hole mold The concrete or mortar sprayed in this way protrudes to the inside of the hole mold to form a convex part, and the convex part can be integrated with the grout material for fixing the lock bolt filled in the hole mold frame. Characterized by the configuration Spray hitting設用method frame for the mold to be.

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