JP2018141341A - Mounting structure of precast wall balustrade and mounting method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a precast wall balustrade and a mounting method thereof which can reduce efforts at the construction site, shorten the term of work, and furthermore ensure the connection of members involved in the joining.SOLUTION: A vertical anchoring bar 7 projects downward from a concrete part of a precast wall balustrade member 2. A receiving hole 9 for receiving the vertical anchoring bar 7 is formed in a ground cover 4 provided on the side part of a floor slab 3. A bump-like mechanical anchoring-type anchoring tool is provided on the tip end of the vertical anchoring bar 7. The precast wall balustrade member 2 is installed so that the receiving hole 9 is filled with a filler 10, followed by receiving the vertical anchoring bar 7 in the receiving hole 9.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a mounting structure and a mounting method for a precast wall rail when a precast concrete member is used as a wall rail for a bridge.

  In bridges, wall height columns are usually provided at both ends in the width direction of the slab (direction parallel to the bridge surface and perpendicular to the bridge axis). The wall rail is generally constructed by cast-in-place construction after slab construction. On the other hand, for the purpose of shortening the construction period, the wall rails are prefabricated with precast concrete, and after the floor slab is installed, the precast wall rails are placed on the floor slab and the concrete is placed at the connection with the floor slab. There are known wall railing attachment structures and methods (for example, Patent Documents 1, 2, and 3) for joining to floor slabs. There is also an attachment method in which a continuous fiber reinforcing material such as carbon fiber standing from a floor slab is inserted into a through-hole provided in a precast wall rail, and the through-hole is filled with non-shrink mortar (for example, Patent Document 4). ).

Japanese Patent No. 2859158 JP2013-36205A JP2015-169031A Japanese Patent Laid-Open No. 2006-160690

  However, in the techniques described in Patent Documents 1 to 3, in order to connect the precast railing member to the floor slab, the reinforcing bars extended from the concrete portion of the precast railing member and the reinforcing bars extended from the concrete portion of the floor slab are used. Concrete, including reinforcement work such as placing reinforcing bars in a cross-sectional view perpendicular to the bridge axis and forming reinforcing loops along the bridge axis direction, and installation of scaffolds and formwork Work for placement is required at the construction site, and reduction of labor and construction time at the construction site has been demanded. The technique described in Patent Document 4 is such that adhesion between the continuous fiber reinforcing material and the non-shrinkable mortar cannot be confirmed, a relatively expensive continuous fiber reinforcing material such as carbon fiber is used instead of the reinforcing bar, and a floor slab Further, since the continuous fiber reinforcing material is erected, there is a problem that it is bulky to store and transport when the floor slab is used as a precast member.

  In view of such a background, the present invention provides a mounting structure and mounting method for a precast wall rail that can reduce the labor on the construction site, shorten the construction period, and further secure the connection of members involved in joining. Objective.

  A precast wall rail mounting structure (1, 31) according to at least some embodiments of the present invention includes a floor slab (3, 37) having a receiving hole (9, 37) extending in the vertical direction and opened upward. ) Or a ground cover (4) provided on the floor slab, and a vertical fixing bar (7a, 7b, 36b) having a concrete part and an end part projecting downward from the lower end of the concrete part, A plate or a precast wall rail member (2, 32) arranged on the ground cover, and a fixing device (11) for mechanical fixing is provided at a lower end of the end portion of the vertical fixing stripe, The end of the direction fixing muscle is embedded in the first filler (10) filled in the receiving hole. Here, the “fixing device for mechanical fixing” means a reinforcing bar main body in a cross section perpendicular to the extending direction of the reinforcing bar, which is provided at the end of the reinforcing bar to transmit the tensile force acting on the reinforcing bar to the concrete in the mechanical fixing. It means a plate or hump having a larger cross-sectional area.

  According to this configuration, in the work for joining the wall rail to the floor slab, it is not necessary to perform the bar arrangement work or the concrete placing work, so the work at the construction site can be reduced and the construction period can be shortened. it can. In addition, the presence of a mechanical fixing fixing device can satisfy the strength performance and deformation performance of a precast wall rail as a vehicle protective fence.

  The mounting structure for the precast wall rail according to at least some embodiments of the present invention is the above-described structure, wherein the receiving groove (15, 38) extending in the vertical direction at one edge in the bridge axis direction of the precast wall rail member. The other precast wall rail member adjacent to the one edge of the precast wall rail member protrudes in the direction of the bridge axis from the edge of the concrete portion facing the one edge. A horizontal fixing rebar (8a) having an end to be fixed, and a fixing tool (11) for mechanical fixing is provided at a protruding end of the end of the horizontal fixing rebar, The end is embedded in the second filler (16) filled in the receiving groove.

  According to this configuration, the joining of the wall rails adjacent to each other in the bridge axis direction can also reduce the work on the construction site, shorten the construction period, and satisfy the strength performance and the deformation performance.

  The mounting structure of the precast wall rail according to at least some embodiments of the present invention is the above-described structure, wherein the fixing tool of the vertical fixing bar and / or the horizontal fixing bar has a front end side thinner than a rear end side. The cross-sectional area of the truncated cone is perpendicular to the extending direction of the reinforcing bar provided with the fixing tool, and the cross-sectional area on the rear end side is larger than the cross-sectional area of the main body of the reinforcing bar.

  According to this structure, the certainty of joining with a precast wall railing member, a floor slab, or a ground cover can be improved.

  A method for attaching a precast wall rail according to at least some embodiments of the present invention includes a receiving hole (3) or a receiving hole formed downward from an upper surface of a ground cover (4) provided on the floor slab (4). 9, 37) with a first filler (10), and a precast wall rail member (2) having longitudinal anchor bars (7a, 7b, 36b) having ends projecting downward from the lower end of the concrete portion. , 32) is disposed so that the end portion of the longitudinal fixing muscle is received in the receiving hole filled with the first filler, and protrudes below the longitudinal fixing muscle. A fixing device (11) for mechanical fixing is formed on an edge of the end portion.

  According to this configuration, in the work for joining the wall rail to the floor slab, it is not necessary to perform the bar arrangement work or the concrete placing work, so the work at the construction site can be reduced and the construction period can be shortened. it can. In addition, the presence of a mechanical fixing fixing device can satisfy the strength performance and deformation performance of a precast wall rail as a vehicle protective fence. In addition, since the vertical fixing streak is inserted into the receiving hole filled with the first filler, it is possible to improve the reliability of the adhesion between the first filler and the vertical fixing streak. In addition, since the longitudinal anchoring line extends along the extending direction of the precast wall rail, it is not bulky when the precast wall rail is stacked and stored and transported.

  According to at least some embodiments of the present invention, the precast wall rail is attached to the receiving groove extending in the vertical direction at one end edge in the bridge axis direction. 15 and 38) and a transverse anchoring bar (8a) having an end projecting in the bridge axis direction from the concrete portion of the other edge in the bridge axis direction, and the step of arranging attempts to arrange The precast wall rail member to be arranged is arranged in the lateral fixing bar of the precast wall rail member in which one of the end portion of the horizontal fixing bar and the receiving groove of the precast wall rail member to be arranged is arranged. Including disposing the upper portion of the precast wall rail member arranged in the vertical direction with respect to the other end of the receiving groove and the other of the receiving groove, and then moving the precast wall rail member downward. In order to enable the movement, at least one of the upper and lower receiving grooves of the precast wall rail member is open, and the edge of the end projecting in the bridge axis direction of the lateral fixing muscle A fixing device (11) for mechanical fixing is formed, and the mounting method is, after the placing step, between the floor slab or the ground cover and the concrete portion of the precast wall rail member, The step of injecting the joint material (6) and the step of filling the receiving groove with the second filler (16) are further provided.

  According to this structure, also about the joining between precast wall balustrade members, the work on a construction site can be reduced, a construction period can be shortened, and strength performance and deformation performance can be satisfied. Further, since the vertical fixing bars and the horizontal fixing bars extend in parallel to the main surface of the precast wall rail member, the precast wall rails are not bulky when stacked and stored and transported.

  An attachment method of a precast wall rail according to at least some embodiments of the present invention is the above-described method, wherein the step of injecting the joint material is an injection hose inserted through the receiving groove whose upper side is open And injecting the joint material pumped by the pump.

  According to this configuration, the joint material can be injected from the vicinity of the lower end of the precast wall rail member without providing an injection port in the mold.

  The mounting method of the precast wall rail according to at least some embodiments of the present invention is the above-described configuration, wherein the fixing tool of the vertical fixing bar and / or the horizontal fixing bar has a front end side thinner than a rear end side. The cross-sectional area of the truncated cone is perpendicular to the extending direction of the reinforcing bar provided with the fixing tool, and the cross-sectional area on the rear end side is larger than the cross-sectional area of the main body of the reinforcing bar.

  According to this configuration, when the longitudinal fixing muscle is inserted into the receiving hole filled with the first filler, it is difficult for bubbles to collect on the front end side of the truncated cone-shaped fixing tool, and the fixing force on the rear end side is reduced. Since it becomes large, the certainty of joining with a precast wall railing member, a floor slab, or a ground cover can be improved.

  A precast wall rail attachment method according to at least some embodiments of the present invention is any one of the above-described methods, wherein the receiving hole (9) is provided in the ground cover, and the ground cover is a factory. Thus, it is manufactured so as to be integrated with the floor slab made of a precast concrete member.

  According to this configuration, even when the thickness of the floor slab is insufficient for the fixing length of the longitudinal fixing muscle, the fixing length can be secured by providing the ground cover, and the ground cover is a secondary product of the factory. Therefore, work on the construction site is not increased.

  ADVANTAGE OF THE INVENTION According to this invention, the construction structure and attachment method of the precast wall rail which can reduce the labor on a construction site, shorten a construction period, and can ensure the connection of the member in connection with joining can be provided.

Schematic perspective view of a wall rail according to the first embodiment Vertical section of wall rail according to the first embodiment Sectional drawing which shows the construction procedure of the wall rail which concerns on 1st Embodiment The front view which shows the construction procedure of the wall rail which concerns on 1st Embodiment Vertical sectional view of wall rail according to the second embodiment Sectional drawing which shows the construction procedure of the wall rail concerning 2nd Embodiment The front view which shows the construction procedure of the wall rail which concerns on 2nd Embodiment Photo showing static loading test results of the first specimen Photo showing the static loading test result of the second specimen (end) Photograph showing the results of static loading test of the second specimen (Bridge axis joint)

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. 2-7, the concrete part of each member shows only the outline with a continuous line, and shows the reinforcing bars etc. which are arrange | positioned in it as seeing through the concrete part.

<First Embodiment>
FIG. 1 and FIG. 2 are a schematic perspective view showing a wall rail attachment structure 1 according to the first embodiment and a cross-sectional view in a cross section orthogonal to the bridge axis direction, respectively. The precast wall rail member 2 in the bridge is joined to a side end portion in a direction (hereinafter referred to as a width direction) perpendicular to the bridge axis of the floor slab 3 through the ground cover 4. The other precast wall rail member 2 adjacent to the bridge axis direction is joined.

  The floor slab 3 is made of a precast concrete member. From the side end portion of the precast floor slab 3, a part of the joining reinforcing bar 5 that joins the ground cover 4 and the floor slab 3 is exposed. The joining rebar 5 has a loop shape when viewed from the bridge axis direction, and an upper portion of the loop shape and an outer portion in the width direction are exposed from the upper surface and the side surface of the side end portion of the precast floor slab 3. The floor slab 3 may be created at the construction site. Further, the floor slab 3 may be prestressed concrete or reinforced concrete.

  The ground cover 4 is preferably a factory secondary product. The ground cover 4 is formed by placing concrete so as to bury a portion exposed from the floor slab 3 of the joining reinforcing bar 5, and covers the upper surface of the side end portion of the floor slab 3 and the outer surface in the width direction.

  The precast wall rail member 2 is disposed above the ground cover 4, and a joint material 6 such as a non-shrink mortar is disposed between the two concrete portions. The precast wall rail member 2 has a longitudinal reinforcing bar 7 extending in a direction orthogonal to the bridge axis and a lateral reinforcing bar 8 extending in the bridge axis direction. From the lower surface of the concrete portion of the precast wall rail member 2, the lower end portion of the longitudinal rebar 7 protrudes downward, and a non-through hole is formed on the upper surface of the ground cover 4 downward. A receiving hole 9 for receiving the lower end portion of the directional reinforcing bar 7 is formed. A lower end portion of the longitudinal reinforcing bar 7 is fixed to the receiving hole 9 by a filler 10 such as a non-shrink mortar. Although it is preferable that the lower end of one longitudinal reinforcing bar 7 is received in one receiving hole 9, the receiving hole 9 is a long hole and the lower ends of a plurality of longitudinal reinforcing bars 7 are received in one receiving hole 9. May be. A fixing tool 11 for mechanical fixing is provided at the edge of the lower end portion of the longitudinal reinforcing bar 7. The fixing device 11 for mechanical fixing is a cross-sectional area that is provided at the end of the reinforcing bar in order to transmit a tensile force acting on the reinforcing bar to the concrete in the mechanical fixing, and that is perpendicular to the extending direction of the reinforcing bar. Means a large plate or hump. The fixing tool 11 in the present embodiment is preferably a hump-like one, and has a truncated cone shape whose tip side is thinner than the rear end side, and a cross section perpendicular to the extending direction of the reinforcing bar on which the fixing tool 11 is provided. Further, it is more preferable that the cross-sectional area on the rear end side is larger than the cross-sectional area of the intermediate portion of the reinforcing bar.

  The vertical reinforcing bar 7 includes a first vertical fixing bar 7a and a second vertical fixing bar 7b that protrudes downward from the inner concrete portion in the width direction of the first vertical fixing bar 7a. The first vertical fixing stripes 7a and the second vertical fixing stripes 7b are preferably alternately arranged at positions shifted along the bridge axis direction (see FIG. 4).

  The entirety of the first vertical fixing muscle 7a extends along the vertical direction. The portion embedded in the concrete portion of the precast wall rail member 2 of the second longitudinal fixing bar 7b surrounds the first vertical fixing bar 7a, the side surface on the inner side of the concrete portion of the precast wall rail member 2, the upper part, and Located along the outer side and curved at the top. Inside the concrete portion of the precast wall rail member 2, in the lower part of the concrete portion, in the width direction of the second longitudinal fixing bar 7 b so that the reinforcing bar has a loop shape in cooperation with the second vertical fixing bar 7 b. It is preferable to provide a U-shaped reinforcing bar 12 connected so as to connect the lower side of the inner part and the outer part.

  Further, in order to reinforce the shear between the ground cover 4 and the precast wall rail member 2, the upper surface of the ground cover 4 is formed with a shear key 13 formed by a step so that the outer side in the width direction is higher than the inner side. In addition, on the lower surface of the concrete portion of the precast wall rail member 2, a shoulder portion 14 whose outer side in the width direction is recessed upward than the inner side so as to correspond to the shear key 13 is formed. Are opposed to each other with the joint material 6 interposed therebetween.

  The lateral rebar 8 includes a lateral fixing bar 8a whose end protrudes from one side surface in the bridge axis direction of the concrete portion of the precast wall rail member 2 and a horizontal portion that is embedded in the concrete portion of the precast wall rail member 2 as a whole. Directional stripe 8b. The horizontal fixing muscles 8a are arranged so as to be aligned along the first vertical fixing muscles 7a. A fixing tool 11 for mechanical fixing is provided at the protruding tip of the lateral fixing muscle 8a. In the present embodiment, the fixing tool 11 of the horizontal reinforcing bar 8 has the same shape as the fixing tool 11 of the vertical reinforcing bar 7, but may be a fixing tool 11 having a different shape. A receiving groove 15 is provided along the vertical direction on the side surface in the bridge axis direction on the opposite side of the concrete portion of the precast wall rail member 2 from the side where the lateral fixing bar 8a is provided. The projecting end of the lateral fixing bar 8a of another precast wall rail member 2 arranged adjacent to the bridge axis direction is received. The upper and lower ends of the receiving groove 15 are open. The receiving groove 15 is filled with a filler 16 such as a non-shrink mortar. The horizontal stripes 8b are arranged so as to line up along the second vertical fixation stripes 7b. The receiving groove 15 preferably has two inner surfaces facing each other in the width direction. However, when filling the filler 16 with one inner surface, a mold may be provided on the opposite side.

  The first longitudinal fixing stripes 7a, the second vertical fixing stripes 7b, and the lateral fixation stripes 8a disposed in the joint material 6 and the fillers 10 and 16 are coated with an epoxy resin or the like to prevent corrosion. It is preferable.

  With reference to FIG.3 and FIG.4, the construction procedure of the attachment structure 1 which concerns on 1st Embodiment is demonstrated. FIG. 3 shows a construction procedure in a cross-sectional view orthogonal to the bridge axis, and FIG. 4 is a front view of a process corresponding to FIG. 3B viewed from the inner side in the width direction.

  First, the floor slab 3 is manufactured as a precast member. Next, as shown in FIG. 3A, the ground cover 4 is manufactured so as to be coupled to the floor slab 3 as a factory secondary product. The receiving hole 9 is preferably formed as a box opening hole, and its inner surface is preferably threaded in a spiral to enhance the adhesion of the filler 10.

  The floor slab 3 combined with the ground cover 4 is transported to a construction site and installed at a predetermined position. As shown in FIG. 4, the precast members of the floor slab 3 adjacent to each other along the bridge axis direction overlap each other's main reinforcing bars 17 extending in the bridge axis direction in a loop shape in front view. The reinforcing reinforcing bars 18 extending in the width direction are installed, and the concrete is cast on the portions to form the in-situ concrete 19.

  Next, as shown in FIGS. 3B and 4, the receiving hole 9 is filled with a filler 10. The precast wall rail member 2 is moved to a position above the position to be arranged by a crane or the like, and the first vertical fixing muscle 7a and the second vertical fixing muscle 7b are received in the receiving hole 9 and installed in the receiving groove 15. The precast wall rail member 2 is lowered and placed at a predetermined position so that the lateral fixing muscle 8a of the adjacent precast wall rail member 2 is received. Since the anchor bolts 20 for installation are provided on the upper surface of the ground cover 4, there is a space for injecting the joint material 6 between the upper surface of the ground cover 4 and the lower surface of the concrete portion of the precast wall rail member 2. It is formed. In addition, when lowering the precast wall rail member 2, instead of inserting the lateral fixing bar 8a of the installed precast wall rail member 2 into the receiving groove 15 of the precast wall rail member 2 to be installed, The lateral fixing bar 8a of the precast wall rail member 2 to be installed may be inserted into the receiving groove 15 of the precast wall rail member 2 that has been installed. In this case, the lower end portion of the receiving groove 15 does not need to be passed through the lateral fixing muscle 8a, and may be closed downward.

  As shown in FIG. 3 (c), a mold 21 for the joint material 6 and for the filler 16 in the receiving groove 15 is installed. Next, an injection hose for the joint material 6 is inserted from the upper part of the receiving groove 15, the tip thereof is disposed near the lower end of the receiving groove 15, and the joint material 6 is pumped by a mortar pump. When the injection of the joint material 6 is completed, the filler 16 for the receiving groove 15 is injected without changing the position of the injection hose or pulling up the injection hose.

  According to this method, by using the reinforcing bar having the fixing device 11 for mechanical fixing, the necessary joint strength for joining the precast wall rail member 2 to the ground cover 4 and the floor slab 3 can be obtained. There is no need to perform loop joints, connection with PC steel, concrete placement, etc., which have been performed by the construction method. Moreover, since the installation of the mold 21 is only required for the joint material 6 and the filler 16, the external scaffold installation work and the installation work of the mold 21 are simplified. Therefore, the work on the construction site can be greatly reduced, and the construction period can be shortened.

  Even when the thickness of the floor slab 3 is not sufficient for the fixing length of the first vertical fixing stripes 7a and the second vertical fixing stripes 7b, the fixing length can be secured by providing the ground cover 4.

  Since the necessary strength can be obtained by using the reinforcing bar having the fixing device 11 of the mechanical fixing for joining the precast wall rail members 2 adjacent to each other, the binding work of the reinforcing bars for joining becomes unnecessary, and the construction site Work at can be reduced. Since the fixing tool 11 of the first vertical fixing stripe 7a and the second vertical fixing stripe 7b has a truncated cone shape, the first vertical fixing stripe 7a and the second vertical direction are received in the receiving hole 9 filled with the filler 10. When the fixing muscle 7b is inserted, bubbles are unlikely to collect at the tip of the fixing tool 11.

  Further, by having the fixing device 11 for mechanical fixing, the fixing length can be shortened, and the receiving hole 9 can be provided on the side of the floor slab 3 and the ground cover 4 instead of the precast wall railing member 2. . In order to provide the receiving hole 9 on the side of the floor slab 3 and the ground cover 4, the first vertical fixing muscle 7 a and the second vertical fixing muscle 7 b are inserted into the receiving hole 9 after filling the receiving hole 9 with the filler 10. it can. Therefore, as compared with the case where the filler 10 is filled after the reinforcing bars are inserted into the holes, the reliability of the attachment of the filler 10 to the first vertical fixing bars 7a and the second vertical fixing bars 7b is high.

  Further, in the precast wall rail member 2, the first vertical fixing bars 7a, the second vertical fixing bars 7b, and the horizontal fixing bars 8a extending from the concrete portion are formed on the main surface of the wall-shaped precast wall rail member 2. Because it protrudes in parallel, it is not bulky when stacked and stored and transported.

Second Embodiment
Next, the attachment structure 31 according to the second embodiment will be described with reference to FIGS. In the description, the description of the configuration common to the first embodiment is omitted, and the same reference numerals are given.

  FIG. 5: is sectional drawing in the cross section orthogonal to the bridge-axis direction which shows the attachment structure 31 of the wall rail which concerns on 2nd Embodiment, respectively. The precast wall rail member 32 in the bridge is joined to the side end portion in the width direction of the floor slab 33 and is joined to another precast wall rail member 32 adjacent in the bridge axis direction.

  The floor slab 33 has a precast portion 33a and a post-installed portion 33b. The precast portion is subjected to lateral fastening tension by the PC steel material 34 at the construction site. Moreover, the precast part 33a has the reinforcing bar 35 partially exposed from exposure from the precast part 33a for joining the post-construction part 33b. In the reinforcing bar 35, an intermediate portion bent in a U-shape is exposed from the precast portion 33a. The post-installed portion 33 b embeds an intermediate portion of the reinforcing bar 35 bent in a U shape and a fixing end portion of the PC steel material 34, and constitutes an end portion in the width direction of the floor slab 33.

  The precast wall rail member 32 is disposed above the side end portion of the floor slab 33, and a joint material 6 such as a non-shrink mortar is disposed between the two concrete portions. The precast wall rail member 32 has a longitudinal reinforcing bar 36 extending in a direction orthogonal to the bridge axis and a lateral reinforcing bar 8 extending in the bridge axis direction. The longitudinal rebar 36 is entirely embedded in the concrete portion of the precast wall rail member 32, and has a loop reinforce 36a formed in a loop shape along the wall surface of the concrete portion, and both ends projecting from the concrete portion. The intermediate part embedded in the part has a lower part of the loop line 36a and a U-shaped vertical fixing line 36b arranged so as to form a loop. Receiving holes 37 for receiving the protruding end portions of the longitudinal fixing bars 36b are provided in each row on the side end portion of the precast portion 33a of the floor slab 33 and the upper surface of the post-installed portion 33b. Both ends of the longitudinal fixing muscle 36b are fixed to the receiving hole 37 by the filler 10 such as non-shrink mortar. A fixing device 11 for mechanical fixing is provided at the tip of both end portions facing downward of the vertical fixing stripe 36b. Since the vertical fixing bars 36b are arranged so as to be orthogonal to the bridge axis, both ends thereof are aligned in the width direction. Accordingly, the two rows of receiving holes 37 are also aligned in the width direction. The receiving hole 37 is provided at a position shifted in the bridge axis direction with respect to the PC steel material 34.

  In the concrete portion of the precast wall rail member 32, a receiving groove 38 is provided along the vertical direction on the side surface in the bridge axis direction opposite to the side on which the lateral fixing reinforcement 8a is provided. The projecting end of the lateral fixing bar 8a of another precast wall rail member 32 arranged adjacent to the bridge axis direction is received. The upper end side of the receiving groove 38 is open, but the lower end side is closed. The receiving groove 38 is filled with a filler 16 such as a non-shrink mortar. The lateral stripes 8b are arranged so as to be aligned along the loop stripes 36a, and the lateral fixing stripes 8a are arranged at an intermediate position between the outer portion and the inner portion in the width direction of the loop stripes 36a, and along the vertical direction. Are lined up.

  The joint material 6 and the longitudinal fixing stripes 36b and the lateral fixing stripes 8a disposed in the fillers 10 and 16 are preferably coated with an epoxy resin or the like in order to prevent corrosion.

  With reference to FIG.6 and FIG.7, the construction procedure of the attachment structure 31 which concerns on 2nd Embodiment is demonstrated. FIG. 6 shows a construction procedure in a cross-sectional view orthogonal to the bridge axis, and FIG. 7 is a front view of a process corresponding to FIG. 6C viewed from the inner side in the width direction.

  First, the precast part 33a of the floor slab 33 is manufactured as a precast member. The receiving hole 37 provided in the precast portion 33a is provided as a box opening hole at the time of factory manufacture. Next, the precast portion 33a is transported to the construction site, and as shown in FIG.

  Next, as shown in FIG. 6 (b), the formwork 40 is installed, and the post-processed portion 33 b of the floor slab 33 is placed so as to embed the end portion of the PC steel material 34 and the exposed portion of the reinforcing bar 35. Is done. The receiving hole 37 of the post-installed portion 33b is provided as a box opening hole. As in the first embodiment, it is preferable that the inner surfaces of the receiving holes 37 of the precast portion 33a and the post-installed portion 33b are spirally threaded in order to enhance the adhesion of the filler 10.

  Next, as shown in FIGS. 6C and 4, the receiving hole 37 is filled with the filler 10. The precast wall rail member 32 is moved above the position to be arranged by a crane or the like, and both ends of the longitudinal fixing bar 36b are received in the receiving hole 37, and the lateral fixing bar 8a is installed in the adjacent precast that has been installed. The precast wall rail member 32 is lowered so as to be received in the receiving groove 38 of the wall rail member 32 and is arranged at a predetermined position. Since the anchor bolts 20 for installation are provided on the upper surface of the floor slab 33, there is a space for injecting the joint material 6 between the upper surface of the floor slab 33 and the lower surface of the concrete portion of the precast wall rail member 32. It is formed. It should be noted that the loop streaks 36a arranged in the vertical direction with respect to the receiving grooves 38 so that the lateral fixing bars 8a can be inserted into the receiving grooves 38 of the installed precast wall rail member 32 from above are received by the loop bars 36a. There is no reinforcing bar in the part that passes through the groove. Therefore, for reinforcement, the arrangement interval of the loop bars 36a having no upper portion in the bridge axis direction in the portion where the receiving groove 38 is formed is shorter than the arrangement interval of the loop bars 36a in the intermediate portion.

  In addition, when the precast wall rail member 32 is lowered, instead of inserting the lateral fixing bar 8a of the precast wall rail member 32 to be installed into the receiving groove 38 of the precast wall rail member 32 that has already been installed, You may insert the horizontal fixing bar | burr 8a of the installed precast wall rail member 32 in the receiving groove 38 of the precast wall rail member 32 to be installed. In this case, the receiving groove 38 is configured such that the lower end is opened downward so that the lateral fixing muscle 8a can pass therethrough.

  As shown in FIG. 6 (d), the mold 21 for the joint material 6 and the filler 16 of the receiving groove 38 is installed, and the joint material 6 and the filler 16 are injected as in the first embodiment.

  According to this method, in the same manner as in the first embodiment, in order to join the precast wall rail member 32 to the floor slab 33, the loop joint, the connection with the PC steel material, and the placement of the concrete performed by the conventional construction method are performed. The installation of the external scaffold and the formwork 21 can be simplified, so that the work on the construction site can be greatly reduced and the construction period can be shortened. As for the joining of the precast wall rail members 32 adjacent to each other, the work on the construction site can be reduced as in the first embodiment. Similar to the first embodiment, the certainty of the adhesion of the filler 10 to the longitudinal fixing stripes 36b is high.

  The second embodiment is suitable for the case where the fixing length of the longitudinal fixing stripes 36b can be secured by the thickness of the floor slab 3.

  A static loading test was performed on the test body corresponding to the mounting structure of the precast wall rail according to the first embodiment.

  The first specimen is a specimen having a length in the bridge axis direction of 2.4 m. A load was applied to the first specimen from the inside in the width direction until the first specimen was broken. FIG. 8 is a photograph of the first specimen after the test (a: a photograph viewed from the bridge axis direction, b: a photograph taken from the inner side in the width direction, and c: a photograph taken from the outer side in the width direction). The ultimate load was 424 kN, which was about three times the design load (138 kN). The fracture type was bending tensile fracture of the ground cover.

  The second specimen is a specimen having a length in the bridge axis direction of 6.0 m. A design load (138 kN) was loaded three times from the inner side in the width direction onto the end of the second specimen. FIG. 9 is a photograph of the second specimen after the test (a: a photograph viewed from the bridge axis direction, b: a photograph taken from the inner side in the width direction, and c: a photograph taken from the outer side in the width direction). The width of the crack generated at the end was 0.2 mm or less.

  Further, a load was applied to the joint portion in the bridge axis direction of the second test body, that is, the joint portion between the two precast wall rail members from the inner side in the width direction until the second test body was broken. FIG. 10 is a photograph of the second specimen after the test (a: photograph taken from the inside in the width direction, b: photograph taken from the outside in the width direction). The integrity of the joints in the direction of the bridge axis was maintained until destruction. Moreover, the fracture type was a push-through shear fracture of the main body portion of the precast wall rail member.

  From the above test, it was confirmed that the precast wall rail configured in the mounting structure according to the first embodiment satisfies the required performance related to the strength performance and deformation performance as the vehicle protective fence.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the first embodiment, the upper end side of the receiving groove is opened to insert a hose for filling material filling, but if the insertion port is secured separately, the upper end side of the receiving groove is closed. Also good. The receiving holes may be one row or three or more rows. The fixing devices for mechanical fixing provided on each fixing line may be the same shape or different shapes. Further, the present invention can be applied to both a new bridge construction work and a floor slab renewal construction work. Even if the precast wall rail member extends downward in the width direction and is provided with a protrusion that contacts the side surface of the floor slab or the ground cover, the protrusion may be used as a form frame on the outer side of the joint material. Good. By providing such a protrusion, an external scaffold for providing the formwork becomes unnecessary.

DESCRIPTION OF SYMBOLS 1,31: Wall railing mounting structure 2, 32: Precast wall railing member 3, 33: Floor slab 4: Ground cover 6: Joint material 7: Longitudinal reinforcing bar 7a: 1st vertical fixing bar 7b: 2nd vertical direction Anchor muscle 8: transverse reinforcing bar 8a: transverse anchor muscle 8b: transverse muscle 9: receiving hole 10: filler (for receiving hole)
11: Fixing tool 15 for mechanical fixing 15: receiving groove 16: filler (for receiving groove)
36: Longitudinal reinforcing bar 36a: Loop bar 36b: Longitudinal fixing bar 37: Receiving hole 38: Receiving groove

Claims (8)

Precast wall railing mounting structure,
A floor slab or a ground cover provided in the floor slab having a receiving hole extending in the vertical direction and opened upward;
A precast wall railing member having a concrete part and a longitudinal fixing bar having an end projecting downward from a lower end of the concrete part, and disposed on the floor slab or the ground cover,
A fixing device for mechanical fixing is provided at a lower end of the end portion of the vertical fixing line, and the end portion of the vertical fixing line is embedded in a first filler filled in the receiving hole. A mounting structure characterized by that. A receiving groove extending in the vertical direction is provided at one edge in the bridge axis direction of the precast wall rail member,
The other precast wall rail member adjacent to the one edge of the precast wall rail member has an end portion protruding in the bridge axis direction from the edge of the concrete portion facing the one edge. Have anchor muscles,
A fixing device for mechanical fixing is provided at a protruding end of the end portion of the lateral fixing stripe, and the end portion of the lateral fixing stripe is embedded in a second filler filled in the receiving groove. The mounting structure according to claim 1, wherein:   The fixing tool of the longitudinal fixing bar and / or the horizontal fixing bar has a truncated cone shape whose tip side is thinner than the rear end side, and is a cross section perpendicular to the extending direction of the reinforcing bar provided with the fixing tool. The mounting structure according to claim 2, wherein a cross-sectional area of the rear end side is larger than a cross-sectional area of the main body of the reinforcing bar. A mounting method for a precast wall rail,
Filling the first filling material into the receiving hole formed downward from the upper surface of the floor slab or the ground cover provided on the floor slab;
A precast wall rail member having a longitudinal fixing bar having an end projecting downward from a lower end of the concrete portion is received in the receiving hole filled with the first filler. And arranging the steps to
A fixing method for a precast wall rail, wherein a fixing device for mechanical fixing is formed on an edge of the end portion protruding downward from the vertical fixing bar. The precast wall rail member has a receiving groove extending in a vertical direction at one end edge in the bridge axis direction, and an end portion protruding in the bridge axis direction from the concrete portion of the other end edge in the bridge axis direction. Direction anchoring muscles,
In the step of placing, the precast wall rail member to be placed is placed on one of the end portion of the lateral fixing bar and the receiving groove of the precast wall rail member to be placed. After arranging the precast wall rail member above the already-arranged precast wall rail member so as to be vertically aligned with the other end of the lateral fixing bar of the wall rail member and the other of the receiving groove, it is moved downward. In order to enable the movement, the receiving groove of the precast wall rail member is open at least one of the upper side and the lower side,
A fixing device for mechanical fixing is formed on an edge of the end portion protruding in the bridge axis direction of the lateral fixing muscle,
The attachment method is, after the placing step,
Injecting joint material between the floor slab or the ground cover and the concrete portion of the precast wall rail member;
The method according to claim 4, further comprising a step of filling the receiving groove with a second filler.   6. The step of injecting the joint material includes injecting the joint material pumped by a pump from an injection hose inserted through the receiving groove having an open top. The mounting method of the precast wall rail of description.   The fixing tool of the longitudinal fixing bar and / or the horizontal fixing bar has a truncated cone shape whose tip side is thinner than the rear end side, and is a cross section perpendicular to the extending direction of the reinforcing bar provided with the fixing tool. The method according to claim 5 or 6, wherein a cross-sectional area of the rear end side is larger than a cross-sectional area of the main body of the reinforcing bar. The receiving hole is provided in the ground cover;
The method for mounting a precast wall rail according to any one of claims 4 to 7, wherein the ground cover is manufactured at a factory so as to be integrated with the floor slab made of a precast concrete member.