JP6842523B1 - PCa wall balustrade, wall balustrade structure, and method of constructing wall balustrade structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PCa wall balustrade, a wall balustrade structure, and a method for constructing a wall balustrade structure, in which it is not necessary to bolt-join PCa wall balustrades to each other, construction can be performed in a short period of time, and construction cost and manufacturing cost are low. An anchor bolt (12) having an enlarged portion formed at an end portion in the longitudinal direction is inserted in a PCa wall column 1 made of precast reinforced concrete which is juxtaposed along the edge of a side end portion of a road slab. Anchor hole 2 that opens to the bottom surface, a spiral bar (6) made of spiral reinforcing bars embedded around the anchor hole 2, and a side shear key that is fitted with an adjacent PCa wall railing column 1. The ridge 3 formed on one end face in the width direction and the concave groove 4 formed on the other end face are provided, and are not connected to the adjacent PCa wall railing 1 via a tension member that transmits a tensile force. [Selection diagram] Fig. 1

Description

The present invention relates to a method for constructing a PCa wall balustrade, a wall balustrade structure, and a wall balustrade structure made of precast reinforced concrete, which are juxtaposed along the edge of the widthwise end of a road slab such as a viaduct as a road protection fence. ..

Conventionally, guardrails and other protective fences have been installed along the sides of roads such as general roads and highways to prevent vehicles from deviating from the road. In particular, it is made of reinforced concrete as a rigid protective fence for the purpose of preventing vehicles from falling from the bridge and deviating from the lane along the ground cover of bridges such as road bridges and viaducts or along the edge (side end) of the floor slab. There is a wall railing.

Further, as a rigid guard fence of this type, in recent years, in order to shorten the period of traffic regulation, a PCa wall railing made of precast concrete, which is hardened by placing concrete in advance at a factory or the like, has been developed.

For example, Patent Document 1 has a continuous fiber reinforcing material erected at a side end of a floor slab and a through hole capable of accommodating the continuous fiber reinforcing material, and the continuous fiber reinforcing material is accommodated in the through hole. A precast wall material installed on the side end portion of the floor slab and a cement-based filler filled in the gap in the through hole are provided in this manner, and horizontal shearing is performed on the upper surface of the side end portion of the floor slab. A precast wall column provided with a bottom shear key for transmitting force is disclosed (claims 1 and 5 of the claims of Patent Document 1, paragraphs [0021] to [0034] of the specification, drawings of drawings. 1, see Fig. 2 etc.).

However, although the precast wall balustrade described in Patent Document 1 is provided with a bottom surface shear key, it acts on the interface between the floor slab or the ground cover and the bottom surface of the wall balustrade due to a collision of a vehicle or the like in an accident. There is a problem that it is not always possible to counter the bending moment caused by the shearing force and the collision load applied to the upper part of the balustrade.

Further, in Patent Document 2 proposed by the applicant of the present application, the anchor bolt 3 is projected upward from the upper surface of the side end portion of the concrete floor slab 2 so as to surround the bolt hole 11 excavated in the bottom surface of the precast wall column 1. The installation structure of the precast wall column 1 in which the spiral reinforcing bar 14 is embedded in the concrete, the anchor bolt 3 is inserted therein, and the time-curable material 5 is filled therein is disclosed (claims of Patent Document 2). 1. Paragraphs [0024] to [0038] of the specification, FIGS. 1 to 3 of the drawings, etc.).

However, in order to use the precast wall balustrade 1 described in Patent Document 2 as a rigid protective fence, tension is applied by various cables 17 (tension members) such as carbon fiber cables, PC steel materials, stainless steel materials, and steel cables. Needed to be tied to each other. For this reason, after the work of installing the precast wall balustrade, it is necessary to connect the precast wall balustrades to each other, which is troublesome and increases the installation cost of the wall balustrade. Further, it is necessary to use expensive stainless steel or carbon fiber, apply a rust preventive paint, or apply a resin coating so that the binding member does not rust, and there is a problem that the material cost and the manufacturing cost are further increased.

In addition, as a temporary blocking installation body, Patent Document 3 states that the entire base portion 3 is made of concrete, and a wide base portion 3 is integrally provided below the horizontally long upper wall portion 2 and the lower surface of the base portion 3 is provided. Disclosed is a blocking installation body provided with insertion grooves 11 for forklifts of a forklift, and further provided with fitting recesses 8 and fitting protrusions 10 for connecting a plurality of the blocking installation bodies to each other on both end side surfaces. (Refer to claim 1, claims of patent document 3, paragraphs [0011] to [0015] of the specification, FIGS. 1 to 3 of the drawings, etc.).

The blocking installation body described in Patent Document 3 has a function of blocking the movement of objects, people, animals, etc., and is a dam body that blocks the movement of earth and sand, earth and stone, water, etc., and the movement of people, vehicle animals, etc. It was used as a movement control body to block the water, and was not fixed to the side of the road or permanently installed. For this reason, there is no idea of integrating the blocking installation bodies with each other, and simply by fitting the fitting recess 8 and the fitting convex portion 10, a mortar or the like is formed between the fitting concave portion 8 and the fitting convex portion 10. It could not be cast and firmly integrated. Further, the blocking installation body described in Patent Document 3 has no means for fixing to a structure such as a ground covering portion of a floor slab, and clears the collision load resistance performance when a vehicle collides, which is required as a wall balustrade. There was a problem that it could not be done.

Japanese Unexamined Patent Publication No. 2016-160690 JP-A-2018-165467 Utility Model Registration No. 3189789 Gazette

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to connect PCa wall balustrades to each other by applying a tensile force with a tension member such as a connecting bolt or a PC steel material. It is an object of the present invention to provide a method for constructing a PCa wall balustrade, a wall balustrade structure, and a wall balustrade structure, which can be constructed in a short period of time and whose construction cost and manufacturing cost are low.

The wall balustrade structure according to claim 1 is a wall balustrade structure formed along the edge of a side end portion of a road slab as a road guard fence, and an anchor having an enlarged portion formed at the end portion in the longitudinal direction. Anchor holes that open on the bottom surface for inserting bolts, spiral bars consisting of spiral reinforcing bars embedded around the anchor holes, and a width that fits with the adjacent PCa wall balustrade and serves as a side shear key. Multiple PCa wall railings made of precast reinforced concrete juxtaposed along the edges of the side edges of road slabs with ridges formed on one end face and recesses formed on the other end face in the direction. A plurality of anchor bolts projecting along the edge of the side end portion of the road slab at predetermined intervals, and an enlarged portion having an enlarged axis at both ends in the longitudinal direction of the anchor bolt. Is formed, and the PCa wall balustrade and the adjacent PCa wall balustrade are not connected via a tension member that transmits tensile force to each other.

The wall balustrade structure according to claim 2 is characterized in that, in the wall balustrade structure according to claim 1 , a spiral reinforcing bar made of a spiral reinforcing bar is embedded around the anchor bolt of the roadbed slab. To do.

The wall balustrade structure according to claim 3 is the wall balustrade structure according to claim 1 or 2, and the bottom surface of the PCa wall balustrade has a convex portion or a concave portion that is fitted with the road slab and serves as a bottom shear key. It is formed along the width direction, and the road slab is characterized in that a convex portion or a concave portion or a convex portion that fits with the concave portion is formed along the road direction.

The wall balustrade structure according to claim 4 is characterized in that, in the wall balustrade structure according to any one of claims 1 to 3 , the anchor bolt is configured to be vertically splittable via a mechanical reinforcing bar joint. To do.

The wall balustrade structure according to claim 5 is a wall balustrade structure formed along the edge of a side end portion of a road slab as a road guard fence, and an anchor having an enlarged portion formed at the end portion in the longitudinal direction. Anchor holes that open on the bottom surface for inserting bolts, spiral bars consisting of spiral reinforcing bars buried around these anchor holes, and width that becomes a side shear key when fitted with adjacent PCa wall balustrades. It has a ridge formed on one end face in the direction and a concave groove formed on the other end face, and the ridge and the concave groove have a penetration for wiring along the width direction through which the ridge and the concave groove are formed. Multiple PCa wall balustrades made of precast reinforced concrete juxtaposed along the edges of the side edges of the road slab where the holes are formed, and at regular intervals along the edges of the side edges of the road slab. A plurality of projecting anchor bolts are provided, and enlarged portions having an enlarged axis are formed at both ends of the anchor bolts in the longitudinal direction, and the PCa wall balustrade and the adjacent PCa wall balustrade are mutually connected. It is not connected via a tension member that transmits tensile force, and a synthetic resin flexible conduit is fitted to the end of the through hole for wiring, and the synthetic resin flexible wire tube is fitted. A packing is fitted around the conduit, and the PCa wall balustrades are joined to each other via the packing.

The method for constructing a wall balustrade structure according to claim 6 is the method for constructing a wall balustrade structure according to any one of claims 1 to 5 , wherein the anchor bolt has an enlarged portion projecting from the road slab. The PCa wall balustrade installation step includes a PCa wall balustrade installation step of inserting and installing the anchor hole of the PCa wall balustrade, and a time-curing material filling step of filling the anchor hole with a time-curing material. The ridge or groove formed on one end surface of the PCa wall balustrade is fitted with the recess or ridge of the adjacent PCa wall balustrade, and the adjacent PCa wall balustrades have a tensile force. It is characterized in that it is not connected via a tension member that transmits the above.

According to the inventions of claims 1 to 5 , it is possible to provide a wall balustrade structure that exerts a function as a rigid protective fence without applying a tensile force to the PCa wall balustrades by a tension member and connecting them to each other. it can. Therefore, the wall balustrade can be constructed in a short time, the construction cost of the wall balustrade structure can be reduced, and the period of traffic regulation can be shortened.

In particular, according to the second aspect of the present invention, even if a large impact load acts on the wall balustrade, the risk that the concrete around the anchor bolts projecting from the road slab will be destroyed and the wall balustrade will collapse is reduced. can do. Therefore, the impact resistance of the wall balustrade is improved, it is possible to withstand a larger collision load, and the function as a rigid guard fence is improved.

In particular, according to the invention of claim 3 , the shearing force in the horizontal direction acting between the road slab and the wall balustrade can be countered by the shear key. For this reason, the impact resistance of the wall balustrade is further improved, it is possible to withstand a larger collision load, and the function as a rigid guard fence is improved.

In particular, according to the invention of claim 4 , it becomes easy to stack and store or transport the floor slabs. Therefore, the storage space for the floor slab can be reduced, and the transportation cost can be reduced.

In particular, according to the invention of claim 5 , it is possible to eliminate the fact that the time-curing material enters the through hole and is hardened, so that the necessary wiring cannot be performed in the through hole.

Further , according to the invention of claim 6 , in the method of constructing the wall balustrade structure, it is not necessary to connect the adjacent PCa wall balustrades to each other via a tension member such as bolting the adjacent PCa wall balustrades. Therefore, the wall balustrade can be constructed in a short time, the construction cost of the wall balustrade structure can be reduced, and the period of traffic regulation can be shortened.

It is a perspective view which shows the PCa wall height column which concerns on 1st Embodiment of this invention. It is the front view which looked at the PCa wall balustrade of the same above from the inside of the road. It is a rear view of the PCa wall balustrade of the same as seen from the outside of the road. It is a left side view which shows the PCa wall height column of the same above. It is a top view which shows the PCa wall column of the same above. It is a bottom view which shows the PCa wall column of the same above. FIG. 2 is a vertical cross-sectional view taken along the line AA of FIG. 2 showing the PCa wall column of the same as above. It is a perspective view which shows the PCa wall height column which concerns on 2nd Embodiment of this invention. It is a left side view which shows the PCa wall height column of the same above. It is a vertical sectional view which shows the wall balustrade structure which concerns on embodiment of this invention. It is a front view which shows a part of the structure of the wall balustrade structure of the same above see through. It is a process explanatory drawing which shows the road slab construction process of the method of constructing the wall balustrade structure which concerns on embodiment of this invention. It is a process explanatory drawing which shows the descending state of the PCa wall balustrade installation process of the above-mentioned wall balustrade structure construction method. It is a process explanatory drawing which shows the interval adjustment state of the PCa wall balustrade installation process of the same above. It is explanatory drawing which shows the state which construction of the wall balustrade structure is completed by the construction method of the wall balustrade structure of the same above. (A) is a horizontal sectional view showing the joint portion of the side shear key between adjacent PCa wall balustrades of the wall balustrade structure according to the second embodiment, and (b) is fitted into the through hole of the side shear key. It is an enlarged view of the part which shows the CD tube alone. Further, (c) is a horizontal cross-sectional view showing a case where only the packing is sandwiched and joined at the joining portion of the side shear keys between the adjacent PCa wall balustrades. (A) is a partially enlarged cross-sectional view showing the vicinity of the bottom shear key of the ground covering portion of the roadbed slab of the same wall balustrade structure, and (b) is a configuration of a mechanical reinforcing bar joint of the same wall balustrade structure. It is a partial cross-sectional view mainly shown. It is a horizontal cross-sectional view which shows the joint part between PCa wall balustrade which is the side shear key of the wall balustrade structure of the same above. It is a perspective view which shows the 2m × 2 body connection model used for FEM analysis. It is a schematic view which shows the element of the said connection model, (a) is a vertical sectional view, (b) is a perspective view. It is a perspective view which mainly shows the steel element of the above-mentioned connection model. It is a schematic vertical sectional view which shows the modeling of the bottom shear key of the above-mentioned connection model. It is a perspective view which shows the modeling of the side shear key of the above-mentioned connection model. It is a perspective view which shows the modeling of the connection bolt of the connection model of the same above. It is a flowchart which shows the determination flow of the adhesion breakage of the bottom surface shear key filling mortar of the above-mentioned connection model. It is a figure which shows the deformation state just before the side shear key attachment breakage of the FEM analysis of the central loading case. It is a figure which shows the deformation state at the time of design load loading of the same FEM analysis. It is a figure which shows the state just before the bottom surface shear key attachment breakage of the same FEM analysis. It is a figure which shows the state immediately after the bottom surface shear key attachment breakage of the same FEM analysis. It is a figure which shows the deformation state at the time of loading 150kN load of the same FEM analysis. It is a figure which shows the deformation state at the time of loading the anchor bolt yield limit load of the same FEM analysis. It is a graph which shows the relationship between the load load of the same FEM analysis and the displacement amount in the direction perpendicular to the bridge axis (thickness direction Y) by comparing the presence and absence of connecting bolts. It is a graph which shows the relationship between the load load of the same FEM analysis and the side opening amount by comparing the presence or absence of a connecting bolt. It is a graph which shows the relationship between the load load of the same FEM analysis and the anchor bolt axial force by comparing the presence or absence of a connecting bolt. It is a figure which shows the deformation state just before the side shear key attachment breakage of the FEM analysis of the unbalanced load case. It is a figure which shows the deformation state at the time of design load loading of the same FEM analysis. It is a figure which shows the state just before the bottom surface shear key attachment breakage of the same FEM analysis. It is a figure which shows the state immediately after the bottom surface shear key attachment breakage of the same FEM analysis. It is a figure which shows the deformation state at the time of loading 150kN load of the same FEM analysis. It is a figure which shows the deformation state at the time of loading the anchor bolt yield limit load of the same FEM analysis. It is a graph which shows the relationship between the load load of the same FEM analysis and the displacement amount in the direction perpendicular to the bridge axis (thickness direction Y) by comparing the presence and absence of connecting bolts. It is a graph which shows the relationship between the load load of the same FEM analysis and the side opening amount by comparing the presence or absence of a connecting bolt. It is a graph which shows the relationship between the load load of the same FEM analysis and the anchor bolt axial force by comparing the presence or absence of a connecting bolt. (1) to (4) are all photographs showing the situation of the vehicle collision experiment. It is a photograph showing the damage situation of the wall balustrade, which is the protective fence of the vehicle crash test, (1) is the entire front photograph, (2) is the entire diagonal photograph, (3) is the B1 block front photograph, and (4) is the B2 block. It is a front photograph. It is a photograph which shows the damage state of the wall balustrade which is a guard fence of a vehicle collision experiment, (1) is a B3 block front photograph, (2) is a B4 block front photograph, (3) is a B5 block front photograph. It is a graph of the residual displacement amount in the thickness direction Y of the wall balustrade which is a guard fence.

Hereinafter, an embodiment of the PCa wall balustrade, the wall balustrade structure, and the method for constructing the wall balustrade structure according to the present invention will be described in detail with reference to the drawings.

<PCa wall column>
[First Embodiment]
First, the PCa wall height column 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a perspective view showing a PCa wall height column 1 according to the first embodiment of the present invention. FIG. 2 is a front view of the PCa wall column 1 as viewed from the inside of the road, and FIG. 3 is a rear view thereof. Further, FIG. 4 is a left side view of the PCa wall height column 1 as viewed along the width direction X. FIG. 5 is a plan view looking down from above vertically, and FIG. 6 is a bottom view thereof. FIG. 7 is a vertical cross-sectional view taken along the line AA of FIG.

The PCa wall balustrade 1 according to the first embodiment includes a wall balustrade main body 10 made of precast reinforced concrete, an anchor hole 2 formed on the bottom surface of the wall balustrade main body 10, and a ridge 3 formed on an end surface in the width direction X. And the concave groove 4 and the like. The PCa wall column 1 is installed side by side in the width direction X along the road direction (for example, in the case of a bridge, in the case of a bridge axis direction), and is designed with anticipation of deformation within the elastic limit of reinforced concrete, which is a main member of the PCa wall height column 1. It has a function as a fence.

Specifically, as a rigid guard fence, the PCa wall height column 1 is 45 kJ or more according to the type of guard fence installation standard for a large vehicle having a height from the road surface to the center of gravity of 1.4 m at the time of the gross vehicle weight. It is required to be able to withstand a collision with a collision angle of 15 degrees due to the degree of impact. Further, the PCa wall height column 1 is also required to be able to withstand a collision at a speed of 60 km / h or a collision angle of 20 degrees at a speed of 100 km / h by a passenger car having a mass of 1 ton.

(Wall balustrade body)
As shown in FIGS. 1 to 7, the wall balustrade main body 10 is made of a board-shaped precast reinforced concrete having a rectangular shape in front view in which the width of the upper end is narrow and the width of the lower end is wide, and the vertical cross section is trapezoidal. It is a member of.

The wall balustrade main body 10 has a predetermined cover thickness (70 mm or more in this embodiment), and a predetermined deformed steel rod S1 (D13 in this embodiment) such as stirrups and force distribution bars is arranged and predetermined. Concrete of the design standard strength of is cast and molded in advance at a factory or the like. In this embodiment, blast furnace slag-based concrete mixed with blast furnace slag fine powder having a design standard strength of 40 MPa (N / mm ^{2) is used as the concrete to be used.} Of course, it goes without saying that the concrete to be used may be concrete in which the design standard strength is appropriately determined according to the structural design and various admixtures and the like are mixed according to the purpose.

As a specific shape of the wall balustrade main body 10, as shown in FIGS. 1, 2, 4, and 7, the lower part of the front surface, which is the inside of the road, is an inclined surface 10a of about 55 degrees, and the upper part of the front surface is. It has a steep slope of about 84 degrees, 10b. Further, the back surface, which is the outside of the road, is a vertical plane 10c, which is a vertical plane, as shown in FIGS. 3, 4, 7, and the like.

As shown in FIGS. 2 to 4, the left side surface and the right side surface have vertical planes 10d and 10e as well as the back surface, and the upper surface has a horizontal plane 10f.

(Bottom shear key: concave)
Further, as shown in FIGS. 1, 4, 6, 7, and the like, the bottom surface of the wall balustrade main body 10 has a recess 5 serving as a bottom surface shear key that opposes a horizontal external force in the thickness direction Y orthogonal to the width direction X. Is formed along the width direction X. The concave portion 5 is a concave groove formed along the width direction X over the entire width of the bottom surface of the wall balustrade main body 10 and has a concave groove at the center, which is fitted with the convex portion 11 of the road slab S. This forms a bottom shear key that opposes the horizontal external force.

In addition, as shown in FIGS. 1, 4, 7, and the like, the bottom surface of the wall balustrade main body 10 has inclined surfaces 10g and 10h that are inclined so as to rise toward the recess 5 formed in the center of the thickness direction Y. It is formed. Therefore, even when the interface between the PCa wall railing column 1 and the road slab S is immersed in precipitation such as rainwater, the possibility that the end expansion anchor bolt 12 described later will be corroded can be reduced.

(Side shear key: ridge, concave groove)
Further, as shown in FIG. 1 and the like, a ridge 3 having a trapezoidal horizontal cross section is formed on the vertical plane 10e which is the right side surface of the wall balustrade main body 10, and the vertical plane 10d which is the left side surface of the wall balustrade main body 10 Is formed with a concave groove 4 having a concave horizontal cross section. Therefore, when the PCa wall railings 1 are installed side by side in the road direction along the width direction X, the ridges 3 and the concave grooves 4 of the adjacent PCa wall railings 1 are fitted to each other, and the side surface that opposes the horizontal external force. Form a shear key.

The ridge 3 and the groove 4 may be provided on either the right side surface or the left side surface of the wall balustrade main body 10. In short, a ridge 3 is formed on one end surface of the width direction X of the wall balustrade body 10, a concave groove 4 is formed on the other end face, and these are fitted together with the adjacent PCa wall balustrades 1 to form a side shear key. Any configuration can be used as long as it can form. Further, the ridges 3 and the concave grooves 4 of the adjacent PCa wall railings 1 are installed at a distance of about 10 mm, and a time-curing material such as non-shrink mortar is filled and integrated between them.

(Anchor hole)
Further, an anchor hole 2 for inserting the end expansion anchor bolt 12 described later is formed on the bottom surface of the wall balustrade main body 10. The anchor hole 2 is formed of an anchor hole main body 20, an injection hole 21 for injecting a fluidity aging material such as mortar or grout, and a discharge hole 22 for discharging the fluidity aging material. Has been done.

As shown in FIG. 6, the anchor hole main body 20 is a hole that opens in a recess 5 on the bottom surface of the wall balustrade main body 10, and both the opening and the horizontal cross section have an elongated hole shape that is long in the width direction X. Therefore, it is easy to adjust the position of the PCa wall height column 1 in the direction of the connecting road.

Further, as shown in FIGS. 4 and 7, the wall surface of the anchor hole main body 20 has a tapered surface so that the thickness direction Y expands toward the back of the wall balustrade main body 10, that is, upward. Therefore, it has a function of preventing the fluidized time-curing material that has been cured by surrounding the end expansion anchor bolt 12 from being pulled out, and has high strength and durability against horizontal external force.

As shown in FIG. 7 and the like, the injection hole 21 communicates with the lower part of the anchor hole main body 20 and the vertical plane 10c which is the back surface of the wall balustrade main body 10, and the diameter increases as it approaches the vertical plane 10c which is the outer surface. It is a hole to be used. Further, the discharge hole 22 is a hole that communicates the upper end portion of the anchor hole main body 20 with the vertical plane 10c and expands in diameter as it approaches the vertical plane 10c which is the outer surface, like the injection hole 21. Both the injection hole 21 and the discharge hole 22 are inclined surfaces that decrease as they approach the vertical plane 10c, which is the outer surface.

Therefore, when the fluid aging curing material is injected from the injection hole 21 communicating with the lower part of the anchor hole main body 20, the fluid aging curing material is gradually filled in the anchor hole main body 20 to reach the upper end portion of the anchor hole main body 20. It flows down from the communicating discharge hole 22 along the inclined surface and is discharged. At this time, the air in the anchor hole main body 20 is also pushed out by the fluidized time-curing material and exhausted. Therefore, the air pool is eliminated, and the fluidized time-curing material can be reliably injected and filled into the anchor hole 2.

(Spiral muscle)
Further, as shown in FIG. 7 and the like, a spiral reinforcing bar 6 made of a spiral reinforcing bar is embedded in the concrete around the wall balustrade main body 10 around the anchor hole main body 20. The spiral bar 6 according to the present embodiment is spirally bent from the deformed steel rod of D10. As shown in FIGS. 2 to 4, since the anchor hole 2 has an elongated hole shape long in the width direction X, the spiral streak 6 also becomes an elliptical spiral streak long in the width direction in a plan view. There is.

When a horizontal external force acts on the spiral muscle 6 due to a vehicle accident or the like and a force is applied in the direction of tilting the PCa wall balustrade 1, the anchor hole main body 20 is formed by the end expansion anchor bolt 12 and the fluidity aging hardening material. It has the function of preventing the surrounding concrete from splitting and breaking when it is pushed out. Therefore, the PCa wall height column 1 has extremely high strength and durability against horizontal external force.

(Bending member)
Further, in the conventional PCa wall balustrade, as described in Patent Document 2, the PCa wall balustrades are fastened to each other with a binding member such as a connecting bolt or a wire at the upper part, or the anchor member is embedded with mortar or the like. It was necessary to connect them via a tension member that transmits a tensile force such as a wire. As mentioned above, as a rigid guard fence made of reinforced concrete, the impact degree is 45 to 280 kJ or more according to the type of guard fence installation standard for a large vehicle with a height from the road surface to the center of gravity of 1.4 m. This is because it is required to be able to withstand a collision with a collision angle of 15 degrees.

However, in the PCa wall height column 1 according to the present embodiment, it was found from the FEM analysis and the vehicle crash test described later that the function as a rigid guard fence can be exhibited without connecting the upper parts with a tension member such as a connecting bolt. did. Therefore, the PCa wall balustrade 1 is not connected to another adjacent PCa wall balustrade 1 via a tension member.

According to the PCa wall column 1 according to the first embodiment described above, the PCa wall column 1 can function as a rigid protective fence without being connected to each other via a tension member such as a connecting bolt or a cable. Can be done. Therefore, not only can the PCa wall balustrade 1 having a low manufacturing cost be provided, but also the PCa wall balustrade 1 can be installed in a short time, the installation cost can be reduced, and the period of traffic regulation can be shortened. it can.

[Second Embodiment]
Next, the PCa wall height column 1'according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a perspective view showing the PCa wall height column 1'according to the second embodiment of the present invention, and FIG. 9 is a left side view of the PCa wall height column 1'viewed along the width direction X.

The PCa wall height column 1'according to the second embodiment is different from the PCa wall height column 1 according to the first embodiment described above in that a plurality of through holes 8 for wiring are formed and a sound insulation panel is installed. This is the point where the anchor bolt 9 for the purpose is projected. Therefore, this point will be mainly described, and the same configurations are designated by the same reference numerals and the description thereof will be omitted.

The PCa wall balustrade 1'according to the second embodiment includes a precast reinforced concrete wall balustrade body 10'similar to the wall balustrade body 10 described above, an anchor hole 2 formed on the bottom surface of the wall balustrade body 10', and an anchor hole 2 formed on the bottom surface of the wall balustrade body 10'. It is composed of ridges 3 and grooves 4 formed on the end faces in the width direction X. The PCa wall balustrade 1'is installed side by side in the width direction X along the road direction, and has a function as a rigid protective fence designed in anticipation of deformation within the elastic limit of reinforced concrete, which is a main member. ..

As shown in FIGS. 8 and 9, a plurality of through holes 8 (four in the illustrated form) for wiring along the width direction penetrating the ridges 3 and the concave grooves 4 of the wall balustrade main body 10'are formed. Is drilled. Wiring such as a communication cable is inserted through these through holes 8.

As described in the background art, in the conventional PCa wall balustrade as described in Patent Document 2, even if the side shear keys are provided on the end faces in the width direction, the wall balustrades are tensioned members such as bolts and cables. It was necessary to connect via. Therefore, it is difficult to provide a through hole penetrating in the width direction X in the PCa wall height column. However, in the PCa wall balustrade 1'according to the second embodiment, wiring for equipment that could not be installed in the conventional PCa wall balustrade can be inserted into the concrete wall. For this reason, not only the work of retrofitting a bracket for wiring or the like becomes unnecessary, but also the scenery is improved by concealing the wiring in the PCa wall column 1'. Further, since the wiring is inserted into the concrete wall of the strong PCa wall balustrade 1', there is little risk of tearing even in an accident, and a highly durable infrastructure network can be installed.

Then, as shown in FIGS. 8 and 9, for installing the sound insulation panel, the columns of the sound insulation panel are bolted and extended above the PCa wall column 1'on the horizontal surface 10f which is the upper surface of the wall column main body 10'. A plurality of (4 in the figure) anchor bolts 9 are projected. The illustrated anchor bolt 9 is an anchor bolt of M22. For this reason, it becomes easy to install a sound insulation panel or a support for a sound absorbing panel on the PCa wall balustrade 1', which is a protective fence, to prevent the noise generated from the road from propagating to the outside for sound insulation and sound insulation. , Workability is improved.

According to the PCa wall balustrade 1'according to the second embodiment described above, wiring for equipment that could not be installed in the conventional PCa wall balustrade can be inserted into the concrete wall. Therefore, by concealing the wiring in the PCa wall balustrade 1', not only the landscape is improved, but also there is less risk of tearing even in an accident, and a highly durable infrastructure network can be installed.

Further, according to the PCa wall balustrade 1', since the anchor bolt 9 is projected, the noise generated from the road for soundproofing and sound insulation is applied to the outside on the PCa wall balustrade 1'which is a protective fence. It becomes easy to install sound insulation panels and columns of sound absorption panels that prevent propagation, and workability is improved.

<Wall balustrade structure>
Next, the wall balustrade structure 100 according to the embodiment of the present invention will be described with reference to FIGS. 10 and 11. The case where the PCa wall height column 1'according to the second embodiment described above is installed on the roadbed slab S will be described as an example. Since the configuration of the PCa wall height column 1'has already been described, the configuration provided in the road slab S will be mainly described. FIG. 10 is a vertical cross-sectional view showing the wall balustrade structure 100 according to the embodiment of the present invention, and FIG. 11 is a front view showing a part of the structure of the wall balustrade structure 100 through a see-through view.

(Road floor version)
The road slab S on which the PCa wall slab 1'is installed is a normal slab made of reinforced concrete, and as shown in FIGS. 10 and 11, the wall slab S is provided along the edge of the side end of the road slab S. A ground covering portion Sa that is thicker and higher than other base parts is formed. Of course, it goes without saying that the present invention can be applied to a floor slab in which a raised ground covering portion Sa is not formed. However, since the ground cover Sa is one step higher, there is a risk that the joint between the PCa wall balustrade 1'and the roadbed slab S will be immersed in precipitation mixed with a snow melting agent such as calcium chloride, which causes salt damage. It is preferable because it reduces the amount.

The roadbed slab S is assumed to be cast-in-place reinforced concrete, but it may be precast reinforced concrete that is cast in a factory or the like in advance, hardened, and then carried to the site and laid.

(Bottom shear key: convex part)
Further, as shown in FIG. 10 and the like, a convex portion 11 that fits with the concave portion 5 formed on the bottom surface of the wall balustrade main body 10'to form a bottom surface shear key is formed on the ground covering portion Sa in the width direction. It is formed along the edge of the road slab S which becomes X.

(End expansion anchor bolt)
Then, as shown in FIG. 10 and the like, the convex portion 11 is provided with an end expansion anchor bolt 12 having an enlarged portion 12a formed at the end portion in the longitudinal direction. The end expansion anchor bolt 12 according to the present embodiment is made of a deformed steel rod of SD345, and a tubular steel material (round nut) is caulked at both ends in the longitudinal direction (axial direction) to form an expansion portion 12a. End band (registered trademark) reinforcing bar. Of course, the end expansion anchor bolt 12 may have an enlarged end in the longitudinal direction, and the tubular steel material (round nut) does not necessarily have to be crimped.

In this embodiment, the end expansion anchor bolt 12 is coated with an epoxy resin to prevent rust. Therefore, even if precipitation invades from the joint portion between the PCa wall balustrade 1'and the roadbed slab S, there is extremely little risk that the end expansion anchor bolt 12 will corrode, and the PCa wall balustrade 1'is extremely durable. Is high.

The end expansion anchor bolt 12 has a roadbed slab S and PCa by inserting an upper end portion, which is one end in the longitudinal direction, into the anchor hole 2 described above, and then filling and curing a fluid aging curing material. It is installed integrally with the wall column 1'.

(Spiral muscle)
Further, as shown in FIGS. 10 and 11, a spiral reinforcing bar 13 made of a spiral reinforcing bar is embedded in the concrete around the roadbed slab S around the lower end portion of the end enlarged anchor bolt 12. The spiral bar 13 according to the present embodiment is spirally bent from the deformed steel rod of D10 in the same manner as the spiral bar 6 described above. The spiral bar 13 has a function of restraining the surrounding concrete and preventing it from splitting and breaking when stress is applied in the direction in which the end expansion anchor bolt 12 is tilted. Therefore, the end expansion anchor bolt 12 is less likely to tilt, and the PCa wall height column 1'can exhibit extremely high durability against horizontal external force.

<How to build a wall balustrade structure>
Next, a method of constructing the wall balustrade structure according to the embodiment of the present invention will be described with reference to FIGS. 12 to 15. The case of constructing the wall balustrade structure 100 described above will be described as an example. FIG. 12 is a process explanatory view showing a road slab construction process of a method for constructing a wall balustrade structure according to an embodiment of the present invention.

(Road floor slab construction process)
First, as shown in FIG. 12, in the method for constructing the wall balustrade structure according to the present embodiment, the road slab construction step for constructing the road slab S of the wall balustrade structure 100 described above is performed.

Specifically, the formwork of the road floor slab S of the wall balustrade structure 100 is assembled, and predetermined reinforcement is arranged. Then, the end expansion anchor bolt 12 made of the end band (registered trademark) reinforcing bar is set at the portion to be the convex portion 11 at a predetermined interval. At this time, the spiral muscle 13 described above is also set around the lower portion of the end expansion anchor bolt 12. Then, concrete is poured into the formwork of the road slab S to construct the road slab S on which the end expansion anchor bolt 12 is projected, as shown in FIG.

(PCa wall balustrade installation process)
FIG. 13 is a process explanatory view showing a descending state of the PCa wall balustrade installation process of the wall balustrade construction method according to the present embodiment, and FIG. 14 is a PCa wall of the wall balustrade construction method according to the present embodiment. It is a process explanatory drawing which shows the interval adjustment state of the balustrade installation process. Next, in the method for constructing the wall balustrade structure according to the present embodiment, as shown in FIGS. 13 and 14, the above-mentioned PCa wall balustrade 1'is lowered to enlarge the end portion of the road floor slab S constructed in the previous step. The PCa wall balustrade installation step of inserting the anchor bolt 12 into the anchor hole 2 of the PCa wall balustrade 1'is performed.

Specifically, after installing the spacer on the ground covering portion Sa shown in FIG. 12, the PCa wall height column 1'is placed, the gap is closed with a formwork, etc., and the time-curing material M1 made of non-shrink mortar or the like is used. (See FIG. 15) is injected and filled.

Then, as shown in FIG. 13, another PCa wall railing column 1'is placed on the ground covering portion Sa from above, which is separated from the end face of the PCa wall railing column 1'in the width direction X by a predetermined distance of the joint, in the width direction X. It will be installed side by side along the lines. At this time, as shown in FIG. 14, another PCa wall height column 1'is lowered and placed on the spacer, and then moved in the direction of the arrow so that the ridge and the concave groove 4 fit together, and the PCa is moved. The distance between the wall height columns 1'is adjusted so that the distance between them is a predetermined value of about 10 mm.

As shown in FIG. 6, the anchor hole 2 that opens in the recess 5 on the bottom surface of the wall balustrade main body 10 has an elongated hole shape in which the opening is long in the width direction X. Therefore, even if the PCa wall balustrade 1'is lowered from above separated by the joints, not only the end expansion anchor bolt 12 can be smoothly inserted into the anchor hole 2, but also the distance between the PCa wall balustrades 1'. It is easy to adjust.

(Time-curing material filling process)
Next, in the method for constructing the wall balustrade structure according to the present embodiment, the time-curing material filling step of filling the anchor hole 2 with the time-curing material is performed.

Specifically, when the above-mentioned fluidized time-curing material is injected from the injection hole 21 of the anchor hole 2 shown in FIG. 10, the fluidized time-curing material is gradually filled from the lower part of the anchor hole main body 20. It flows down along the inclined surface from the discharge hole 22 communicating with the upper end of the anchor hole main body 20 and is discharged. At this time, the air in the anchor hole main body 20 is also pushed out by the fluidized time-curing material and exhausted. Therefore, the air pool is eliminated, and the fluidized time-curing material can be reliably injected and filled into the anchor hole 2.

FIG. 15 is an explanatory view showing a state in which the construction of the wall balustrade structure 100 is completed by the method for constructing the wall balustrade structure according to the present embodiment. As shown in FIG. 15, in parallel with injecting and filling the anchor hole 2 with the time-curing material, a time-curing material M2 such as mortar is provided between the ridge 3 and the groove 4 which are the side shear keys. Fill. Of course, before adjusting the interval in the above-mentioned PCa wall balustrade installation step shown in FIG. 14, the PCa wall balustrade 1'is filled with a time-curing material and the PCa wall balustrade 1'is pressed in the direction of the arrow to remove the overflowing mortar. It may be in the state shown in FIG. 15 by scraping it flat along the outer surface of'. In short, filling of the time-curing material other than injecting and filling the fluidity time-curing material into the anchor hole 2 may be performed in parallel with the PCa wall balustrade installation step.

As described above, the construction of the wall balustrade structure 100 by the method for constructing the wall balustrade structure according to the present embodiment is completed.

In the method for constructing the wall balustrade structure according to the present embodiment, the adjacent PCa wall balustrades 1'are not connected to each other by bolting or inserting a cable in any of the steps. Therefore, since the metal member for joining is exposed, it is not necessary to fill the metal member to prevent rust or to apply a rust preventive paint to the metal member. Therefore, the wall balustrade structure 100 can be constructed in a short time, the construction cost can be reduced, and the period of traffic regulation can be shortened.

According to the wall balustrade structure 100 and the method for constructing the wall balustrade structure 100 according to the embodiment of the present invention described above, a wall that exhibits a function as a rigid protective fence without connecting PCa wall balustrades 1'to each other via a tension member. A balustrade structure can be constructed. Therefore, the wall balustrade structure can be constructed in a short time, the construction cost of the wall balustrade structure can be reduced, and the period of traffic regulation can be shortened.

Further, according to the wall balustrade structure 100, even if a large impact load acts on the wall balustrade, the end expansion anchor bolt 12 projecting from the road slab S due to the concrete restraining function of the spiral bar 6 and the spiral bar 13 It is possible to reduce the risk that the concrete around the wall will collapse and the wall rails will collapse. Therefore, the impact resistance of the wall balustrade is improved, it is possible to withstand a larger collision load, and the function as a rigid guard fence is improved.

Further, according to the wall balustrade structure 100, since the convex portion 11 is formed by fitting with the concave portion 5 formed on the bottom surface of the wall balustrade main body 10'to form the bottom surface shear key, the road floor slab S and PCa are formed. It can counter the horizontal shear force acting between the wall railing 1'and. For this reason, the impact resistance of the wall balustrade is further improved, it is possible to withstand a larger collision load, and the function as a rigid guard fence is improved.

<Modification example of wall balustrade structure>
Next, the wall balustrade structure 200 according to the second embodiment, which is a modification of the wall balustrade structure 100 described above, will be described with reference to FIGS. 16 to 18. The wall balustrade structure 200 according to the second embodiment is different from the wall balustrade structure 100 described above in that the CD tube 14 is provided in the through hole 8 of the side shear key which is the joint portion between the PCa wall balustrades 1'. It is a point where it is fitted, and a point where the above-mentioned end expansion anchor bolt 12 is an end expansion anchor bolt 12'which is configured to be divisible by a mechanical reinforcing bar joint 15. Therefore, with respect to the wall balustrade structure 200, these differences will be mainly described, the same configurations are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 16A is a horizontal cross-sectional view showing a joint portion of side shear keys between adjacent PCa wall railing columns 1'of the wall railing structure 200 according to the second embodiment. Further, FIG. 16B is an enlarged view of parts showing a single CD tube 14 fitted in the through hole 8 of the side shear key, and FIG. 16C is a side surface of adjacent PCa wall height columns 1'. It is a horizontal sectional view which shows the case where only the packing 17 is sandwiched and joined at the joining part of a shear key.

As shown in FIG. 16A, the wall balustrade structure 200 according to the modified example has a VE pipe (hard vinyl electric wire) of the above-mentioned PCa wall balustrade 1'in a side shear key which is a joint portion between PCa wall balustrades 1'. CD tubes 14 are fitted to the ends of a plurality of through holes 8 for wiring (tubes) via resin couplings 16. Further, in the wall balustrade structure 200, a packing 17 is fitted around the CD tube 14, and the PCa wall balustrades 1'are joined to each other via the packing 17.

The packing 17 is a general rubber packing in which a circular hole of φ60 mm corresponding to the diameter of the through hole 8 is bored in a rectangular rubber material made of a rubber elastic body having a width of 90 mm and a height of 120 mm and a thickness of about 17 mm. Is.

Further, as shown in FIG. 16B, the CD tube 14 is a CD tube having a length of about 55 mm and an outer diameter of 60 mm. Here, the CD tube refers to a synthetic resin flexible conduit (combined Duct), and generally refers to a synthetic resin flexible conduit that is not self-extinguishing (non-flame resistant) and is exclusively for concrete embedding. .. Of course, in the wall balustrade structure according to the present invention, it goes without saying that a single-layer or multi-layer PF tube (Plastic Flexible conduit) may be used instead of the CD tube 14.

As shown in FIG. 16C, in the case where there is no CD tube 14 and only packing 17, the side shear key of the joint portion between the PCa wall height columns 1'is filled with a time-curing material M2 such as non-shrink mortar. At that time, the packing 17 may be deformed and the time-curing material M2 may enter the through hole 8 and be cured. However, in the wall balustrade structure 200, the CD tube 14 is arranged and the packing 17 is fitted around the CD tube 14.

Therefore, the CD tube 14 can prevent the packing 17 from leaking due to the effect of suppressing the deformation of the packing 17. The CD pipe 14 is not used as a joint material for the pipeline, but functions as a reinforcing material for the packing 17. Therefore, with these configurations, it is possible to eliminate the fact that the time-curing material M2 enters the through hole 8 and is hardened, so that the necessary wiring cannot be performed in the through hole 8. Of course, in the wall balustrade structure according to the present invention, it goes without saying that the CD pipe 14 may be used as a joint material for the pipe line.

FIG. 17A is a partially enlarged cross-sectional view showing the vicinity of the bottom shear key of the ground covering portion Sa of the roadbed slab S of the wall balustrade structure 200, and FIG. 17B is mainly a mechanical reinforcing bar joint 15. It is a partial cross-sectional view which shows the structure. As shown in FIG. 17, the ground covering portion Sa of the wall balustrade structure 200 is provided with an end expansion anchor bolt 12'in which an expansion portion 12a is formed at an end portion in the longitudinal direction.

Like the end expansion anchor bolt 12 described above, the end expansion anchor bolt 12'is made of a deformed steel rod of SD345, and tubular steel materials (round nuts) are crimped at both ends in the longitudinal direction (axial direction). It is stopped and the enlarged portion 12a is formed. However, as shown in FIG. 17, the end expansion anchor bolt 12'is a mechanical reinforcing bar joint 15 such as an FD grip manufactured by Fuji Bolt Mfg. Co., Ltd., and has a convex portion, unlike the end expansion anchor bolt 12 described above. It is configured so that it can be divided into an upper portion 12b and a lower portion 12c with the vicinity of the upper surface of 11 as a boundary.

In the end expansion anchor bolt 12', the lower portion 12c is embedded in the convex portion 11 of the ground covering portion Sa, and by rotating the upper portion 12b, the upper portion 12b moves up and down in the axial direction of the reinforcing bar, and the mechanical reinforcing bar joint 15 causes the upper portion 12b to move up and down. It is a mechanism to screw with the lower part 12c.

As shown in FIG. 17B, the mechanical rebar joint 15 is composed of a joint upper portion 15a, a joint lower portion 15b, a full screw bolt 15c, and the like. Female threaded portions 15d and 15e are formed on the upper portion 15a of the joint and the lower portion 15b of the joint. By screwing all the screw bolts 15c across the female threaded portion 15d and the female threaded portion 15e, the joint upper portion 15a and the joint lower portion 15b can be joined or detached freely. As a result, the lower portion 12c and the upper portion 12b of the end expansion anchor bolt 12'are configured to be separable or joinable.

In this way, the end expansion anchor bolt 12'is configured to be divisible into an upper portion 12b and a lower portion 12c, so that the end portion is used when storing or transporting the road floor slab S (floor slab). The upper portion 12b of the expansion anchor bolt 12'can be removed. Therefore, the end expansion anchor bolt 12'does not protrude from the upper surface of the ground covering portion Sa of the road slab S (floor slab), and the road slab S (floor slab) is stacked, stored, or transported. This makes it possible to reduce the storage space and the transportation cost.

FIG. 18 is a horizontal cross-sectional view showing a joint portion between PCa wall railings 1'which are side shear keys. As shown in FIG. 18, in the wall balustrade structure 200, it is preferable that the corners of the outer side surface of the side shear key are V-cut along the vertical direction to form a crack-inducing joint 18.

The crack-inducing joint 18 has a function of suppressing the occurrence of unordered cracks due to aged deterioration of the time-curing material M2 such as non-shrink mortar and the concrete of the PCa wall balustrade 1'due to the difference in thermal expansion. This is because if a crack occurs in a place that was not originally expected, it may be regarded as a structurally serious crack. By generating a crack in the crack-inducing joint 18, it can be treated as an expected crack. Further, by sealing the outside of the crack-inducing joint 18 with a sealing material, it is possible to prevent rainwater from entering the inside of the PCa wall balustrade 1'from the crack.

According to the wall balustrade structure 200 according to the second embodiment of the present invention described above, the packing 17 is externally fitted around the CD tube 14 which is a flexible electric wire tube made of synthetic resin, and the PCa is passed through the packing 17. The wall balustrades 1'are joined together. Therefore, according to the wall balustrade structure 200, in addition to the above-mentioned effects and effects, it is wiped out that the time-curing material M2 enters the through hole 8 and is hardened, so that the necessary wiring cannot be performed in the through hole 8. can do.

Further, according to the wall balustrade structure 200, the end expansion anchor bolt 12'is configured to be split into an upper portion 12b and a lower portion 12c by a mechanical reinforcing bar joint 15, so that road slabs S (floor slabs) are stacked. It can be stored and transported. Therefore, according to the wall balustrade structure 200, the storage space can be reduced and the transportation cost can be reduced.

The method of constructing the PCa wall balustrade 1, 1', the wall balustrade structures 100, 200 and the wall balustrade structure 100 according to the first and second embodiments of the present invention has been described in detail above. However, the above-mentioned or illustrated embodiments are merely one embodiments embodied in carrying out the present invention. Therefore, the technical scope of the present invention should not be construed in a limited manner by these. In particular, the road slab S on which the PCa wall column 1, 1'is installed is not limited to the slab of a bridge, and the present invention can be applied to a road slab placed directly on the ground.

<3D FEM analysis>
Next, using FIGS. 19 to 43, three dimensions were performed to verify the continuity of the PCa wall balustrade in the bridge axis direction, the connection performance with respect to the joint structure with the cast-in-place slab, and the behavior of the wall balustrade. FEM (Finite Element Method) analysis will be described. For the analysis, FEMLEEG Ver.5 (Forum8 Co., Ltd.) was used, and the study was conducted by three-dimensional linear FEM analysis.

(1) FEM analysis model The analysis model has the same configuration as the PCa wall height column 1 described above, and is set as the L = 2 m × 2 body connection model shown in FIGS. 19 and 20. In this two-body connection model, in order to confirm the load transmission of the connection part, both the central loading case focusing on bending and the uneven loading case focusing on shear were examined.

(2) Connecting bolts The two-body connecting model was connected with connecting bolts (SUS327L1 M24) as shown in FIG. 21, and what kind of force acts on these connecting bolts was verified. The mortar to be filled in the side shear key on the end face in the width direction and the bottom shear key on the bottom surface was verified as having the same physical characteristics as concrete. Anchor bolts were also modeled with truss elements.

(3) Details of Shear Key The embodiment of the shear key has a trapezoidal shape as described above, but in the FEM analysis, as shown in FIGS. 22 and 23, it was simply opened into a rectangle and modeled. Further, in the side shear key and the bottom shear key, the packing material is arranged in the actual PCa wall column, but this was not modeled in the analysis.

(4) Joint conditions between anchor bolts / connecting bolts and concrete Anchor bolts were modeled as truss elements, and the transmission of force to concrete was considered in the section where the anchor bolts were placed. However, when the axial force of the anchor bolt exceeds 11 kN, it is assumed that the anchor bolt is not attached to the concrete, no node is provided between them, and the force is not transmitted. Since an enlarged part (round nut) is arranged at the upper and lower ends, the force is set to be transmitted at this position. In addition, the reason why 11 kN was used as a reference is that the anchor was pulled out with a maximum load of 11.7 kN in a separate test.

The connecting bolt was modeled as a truss element, as shown in FIG. 24, and the anchor plate was modeled as a plate element (□ 80 mm × 80 mm × thickness 16 mm). The force was transmitted to the concrete through the anchor plates at the left and right ends, that is, the constituent nodes of the truss element were set to the left and right ends, and no nodes were provided between them (no adhesion). In addition, the joining conditions for concrete were set as a perfect node joint between the plate and the solid element (fixed in the bridge axis, right angle, and vertical direction) (the end of the truss element and the center of the plate are completely jointed at the node).

(5) Physical characteristics The PCa wall balustrade, cast-in-place slab, and shear key filling mortar were all set to σck = 40N / mm ² , Young's modulus E = 31000N / mm ² , and Poisson's ratio ν = 0.2.

The anchor bolts were set to SUS327L1 M18, cross-sectional area A = 192 mm ² , yield strength Py = 105 kN, punching shear strength 160 kN, Young's coefficient E = 200,000 N / mm ² , and Poisson's ratio ν = 0.3.

The connecting bolts were set to SUS327L1 M24, cross-sectional area A = 353 mm ² , yield strength Py = 194 kN, punching shear strength 160 kN, Young's coefficient E = 200,000 N / mm ² , and Poisson's ratio ν = 0.3.

The anchor plate of the connecting bolt was set to SUS327L1 dimensions 80 × 16 × 80 mm, Young's modulus E = 200,000 N / mm ² , and Poisson's ratio ν = 0.3.

(6) Load conditions The loaded load was the vehicle collision load. The design load was set to 88 kN, which is the SA type vehicle collision load shown in Table 6-5-1 (next table) of Chapter 6 5-3 Reinforced Concrete Guard Fence, Design Guidelines Vol. 2 [Bridge Construction].

In addition, in this study, since the adhesion breakage of the shear key filling mortar part was taken into consideration, the behavior before and after the adhesion breakage, the state of each part at the time of design load, etc. were confirmed in the process of gradually increasing the load. The maximum load was set to the yield limit yield strength of 105 kN for anchor bolts.

The load was loaded with a surface distribution load of 200 mm x 200 mm. In order to confirm the behavior and stress state of the connecting part of the two PCa wall balustrades, two cases were carried out, mainly a load for bending and a load for shearing.

(7) Convergence calculation of shear key-filled mortar adhesion breakage Modeling of shear key-filled mortar adhesion breakage follows the judgment flow shown in FIG. The stress that determines the adhesion breakage of the shear key filling mortar is as follows.
The side shear key-filled mortar shall be peeled off (disattached) at a tensile stress of 1.5 N / mm ² or more in the bridge axis direction (width direction), and the bottom shear key-filled mortar shall have a vertical tensile stress of 1.5 N / mm ² The above is the source of peeling (cutting off).
Note 1) Adhesion strength of shear key 1.5 N / mm ² is a general strength required for cross-section restoration materials.
Note 2) The tensile stress that determines the adhesion breakage is only the tensile stress in the direction perpendicular to the shear key. If there is no vertical peeling at each shear key filling mortar position, it is assumed that force can be transmitted for horizontal direct stress and shear stress, and in this analysis, it is set as above for convenience. There is.
Note 3) The tensile stress for determining adhesion breakage is the element center stress value of the elements that make up the shear key filling mortar.

(8) Analysis result 8-1) Central loading (focusing on bending) Cases The deformation diagrams of the analysis results of the two-body connection model are as shown in FIGS. 26 to 31. The values in parentheses indicate the amount of displacement without connecting bolts. In addition, the events in the wall height column confirmed in this analysis are shown in the following table.

(Result consideration)
(1) At the time of design load, almost no tensile force acts on both anchor bolts and connecting bolts.
(2) At a loading load of 132 kN (150% of the design load), the adhesion of the bottom shear key filling mortar begins to break. After that, the adhesion is cut off in the entire area, leaving one row element on the compression edge (outer surface) side without increasing the load.
(3) Immediately after the bottom shear key filling mortar is completely attached, the axial force of the anchor bolt increases sharply, and the adhesion between the anchor bolt and concrete is also cut in the entire area. (Joined only at the upper and lower ends) Anchor bolts yield when the load is about 201 kN (228% of the design load).
(4) The maximum displacement of the top wall height on the outer surface side at the maximum load is 7.7 mm near the center and 6.6 mm at the model end. There is no big difference with and without connecting bolts.
(5) The opening amount of the connecting portion at the maximum load is about 0.3 mm in the bridge axis direction and about 0.1 mm in the perpendicular direction (deviation), and the unity as a continuum can be confirmed.

(Displacement amount)
The amount of displacement with respect to the loaded load is as shown in FIG. It was found that there was no significant difference in the amount of displacement at each position of interest depending on the presence or absence of the connecting bolt. The table below shows the amount of displacement of the wall height column of the central loading case in the outer surface direction.

(Amount of side opening)
FIG. 33 shows a comparison of the amount of side opening due to the loaded load with and without the connecting bolt. From the figure, it was found that there was almost no difference in the amount of opening with or without the connecting bolt. Each numerical value is shown in the following table.

(Load-Axle force of each bolt)
FIG. 34 shows a comparison of the axial forces of each bolt due to the loaded load with and without the connecting bolt. From the figure, it was found that there was almost no difference in the axial force of the anchor bolts with and without the connecting bolts. Each numerical value is shown in the following table.

8-2) Unbalanced load (shear focus) case The deformation diagram of the analysis result of the two-body connection model is as shown in FIGS. 35 to 40. The values in parentheses indicate the amount of displacement without connecting bolts. In addition, the events in the wall height column confirmed in this analysis are shown in the following table.

(Result consideration)
(1) At the time of design load, almost no tensile force acts on both anchor bolts and connecting bolts.
(2) At a loading load of 139 kN (158% of the design load), the adhesion of the bottom shear key filling mortar begins to break. After that, the adhesion is cut off in the entire area, leaving one row element on the compression edge (outer surface) side without increasing the load.
(3) Immediately after the bottom shear key filling mortar is completely attached, the axial force of the anchor bolt increases sharply, and the adhesion between the anchor bolt and concrete is also cut in the entire area. (Joined only at the upper and lower ends) Anchor bolts yield when the load is about 184 kN (209% of the design load).
(4) The maximum amount of displacement on the outer surface side of the wall height at the top at the maximum load is 7.5 mm near the center and 6.5 mm at the end of the model. There is no big difference with and without connecting bolts.
(5) The opening amount of the connecting portion at the maximum load is 0.24 mm in the bridge axis direction and 0.96 mm in the perpendicular direction (deviation).

(Displacement amount)
The amount of displacement with respect to the loaded load is as shown in FIG. It was found that there was no significant difference in the amount of displacement at each position of interest depending on the presence or absence of the connecting bolt. The table below shows the amount of displacement of the wall height column of the central loading case in the outer surface direction.

(Amount of side opening)
FIG. 42 shows a comparison of the amount of side opening due to the loaded load with and without the connecting bolt. From the figure, it was found that there was almost no difference in the amount of opening with or without the connecting bolt. Each numerical value is shown in the following table.

(Load-Axle force of each bolt)
FIG. 43 shows a comparison of the axial forces of each bolt due to the loaded load with and without the connecting bolt. From the figure, it was found that there was almost no difference in the axial force of the anchor bolts with and without the connecting bolts. Each numerical value is shown in the following table.

From the FEM analysis explained above, there is almost no difference in the displacement amount, side opening amount, and axial force of the anchor bolts with and without the connecting bolts in both the central loading and the uneven loading, and the anchor bolts yield to the connecting bolts as well. It turned out that almost no axial force acts until. Therefore, it can be said that it has been found that even the wall balustrade structure 100 without the above-mentioned connecting bolts sufficiently exerts the function of the reinforced concrete protective fence.

<Vehicle crash test>
Next, with reference to FIGS. 44 to 47, a vehicle collision experiment conducted using an actual vehicle based on the above-mentioned three-dimensional FEM analysis result will be described. FIG. 44 is a photograph showing a vehicle collision situation in a vehicle collision experiment.

As shown in FIG. 44, a wall balustrade structure equivalent to the wall balustrade structure 100 in which the above-mentioned PCa wall balustrade 1 was installed on the roadbed slab S was constructed, and a vehicle collision experiment using an actual vehicle was conducted. Specifically, the vehicle shown in the "Vehicle Guard Fence Performance Confirmation Test Method" issued by the Director of the Road Environment Division, Road Bureau, Ministry of Construction, dated November 5, 1998, published in "Standards for Installation of Guard Fences and Explanations". A protective fence performance confirmation test (collision condition A) was conducted. That is, when the gross vehicle weight is 1.4 m, the height from the road surface to the center of gravity is 280 kJ or more according to the type (SB) of the protection fence installation standard for a large vehicle with a vehicle mass of 25 tons, and the collision angle is 15 degrees. Vehicle collision test was conducted.

FIG. 45 is a photograph showing the damage state of the wall balustrade, which is a protective fence for a vehicle collision experiment, in which (1) is an entire front photograph, (2) is an oblique overall photograph, (3) is a B1 block front photograph, and (4). ) Is a front photograph of the B2 block. FIG. 46 is a photograph showing the damage state of the wall railing, which is a protective fence for a vehicle crash test, in which (1) is a front photograph of a B3 block, (2) is a front photograph of a B4 block, and (3) is a front photograph of a B5 block. is there. As shown in FIGS. 45 and 46, in the vehicle collision test results, no cracks or damages could be confirmed in the connecting portion even if the wall balustrade structure was not connected by tension members such as connecting bolts and cables. It was.

FIG. 47 is a graph of the residual displacement amount in the thickness direction Y of the wall balustrade which is a protective fence. Further, as shown in FIG. 47, the residual displacement amount in the thickness direction Y was 5 mm at the maximum value, which was within the measurement error (± 5 mm). As is clear from FIGS. 44 to 47 described above, the vehicle collision test results show that even in the wall balustrade structure not connected by the tension member, no cracks or damages can be confirmed in the connected portion, and the vehicle is used as a rigid protective fence. It can be said that it was proved that the function of is fully exhibited. Even if the wall balustrade structure according to the present invention is not connected to each other by a tension member, it has a large impact due to functions such as side and bottom shear keys, end expansion anchor bolts and spiral bars, and an anchor hole taper structure. It is considered that this is because the structure can withstand a load.

100,200:
1,1': PCa wall balustrade 10,10': Wall balustrade body 10a: Inclined surface (front)
10b: Steep slope (front)
10c: Vertical plane (back)
10d: Vertical plane (left side)
10e: Vertical plane (right side)
10f: Horizontal plane (upper surface)
10g, 10h: Inclined surface (bottom surface)
S1: Deformed steel rod (reinforcing bar)
2: Anchor hole 20: Anchor hole body 21: Injection hole 22: Discharge hole 3: Convex (side shear key)
4: Concave groove (side shear key)
5: Recess (bottom shear key)
6: Spiral muscle 8: Through hole (for equipment) 9: (for sound insulation panel) Anchor bolt S: Road slab (floor slab)
Sa: Ground covering parts M1, M2: Time-curing material 11: Convex part (bottom shear key)
12, 12': End expansion anchor bolt 12a: Expansion portion 12b: Upper 12c: Lower 13: Spiral reinforcement 14: CD tube (flexible conduit made of synthetic resin)
15: Mechanical reinforced joint 15a: Upper part of joint 15b: Lower part of joint 15c: Full screw bolt 15d, 15e: Female thread 16: Coupling 17: Packing 18: Crack induction joint X: Width direction Y: Thickness direction

Claims (6)

It is a wall balustrade structure formed along the edge of the side edge of the road slab as a road guard fence.
Anchor holes opened in the bottom surface for inserting anchor bolts having an enlarged portion formed at the end in the longitudinal direction, spiral reinforcing bars composed of spiral reinforcing bars embedded around the anchor holes, and adjacent PCa. Along the edge of the side end of a road slab with ridges formed on one end face in the width direction and concave grooves formed on the other end face that fit into the wall balustrade and serve as side shear keys. It is provided with a plurality of PCa wall balustrades made of precast reinforced concrete arranged side by side and a plurality of anchor bolts projecting at predetermined intervals along the edge of the side end of the road slab.
Enlarged portions having an enlarged axis are formed at both ends of the anchor bolt in the longitudinal direction.
A wall balustrade structure characterized in that the PCa wall balustrade and an adjacent PCa wall balustrade are not connected via a tension member that transmits tensile force to each other. The wall balustrade structure according to claim 1 , wherein a spiral reinforcing bar made of a spiral reinforcing bar is embedded around the anchor bolt of the road slab. On the bottom surface of the PCa wall balustrade, a convex portion or a concave portion that is fitted with the road slab and serves as a bottom shear key is formed along the width direction.
The wall balustrade structure according to claim 1 or 2 , wherein the road slab has a convex portion or a concave portion or a convex portion that fits with the concave portion formed along the road direction. The wall balustrade structure according to any one of claims 1 to 3 , wherein the anchor bolt is configured to be vertically splittable via a mechanical reinforcing bar joint. It is a wall balustrade structure formed along the edge of the side edge of the road slab as a road guard fence.
An anchor hole that opens on the bottom surface for inserting an anchor bolt with an enlarged portion formed at the end in the longitudinal direction, a spiral reinforcing bar composed of a spiral reinforcing bar embedded around the anchor hole, and an adjacent PCa. It has a ridge formed on one end face in the width direction and a concave groove formed on the other end face, which is fitted to a wall balustrade and serves as a side shear key. Multiple PCa wall balustrades made of precast reinforced concrete arranged side by side along the edge of the side end of the road slab with through holes for wiring along the width direction penetrating these, and the road slab. Provided with a plurality of anchor bolts, which are provided at predetermined intervals along the edge of the side end.
Enlarged portions having an enlarged axis are formed at both ends of the anchor bolt in the longitudinal direction.
The PCa wall balustrade and the adjacent PCa wall balustrade are not connected via a tensile member that transmits tensile force to each other.
A flexible electric wire tube made of synthetic resin is fitted to the end of the through hole for wiring, and a packing is externally fitted around the flexible electric wire tube made of synthetic resin. A wall balustrade structure characterized in that the PCa wall balustrades are joined to each other via. The method for constructing a wall balustrade structure according to any one of claims 1 to 5.
A PCa wall balustrade installation step of inserting and installing the anchor hole of the PCa wall balustrade into the anchor bolt having an enlarged portion projecting from the road slab.
The anchor hole is provided with a time-curing material filling step of filling the time-curing material.
In the PCa wall balustrade installation step, the ridge or the concave groove formed on one end surface of the PCa wall balustrade is fitted with the concave groove or the ridge of the adjacent PCa wall balustrade.
A method for constructing a wall balustrade structure, characterized in that adjacent PCa wall balustrades are not connected to each other via a tensile member that transmits a tensile force.