JP6959609B2 - Rapid renewal method for existing wall balustrade - Google Patents

Description

The present invention relates to a rapid renewal method for existing wall balustrades, for example, by replacing existing wall balustrades installed on road bridges with precast wall balustrades, it is possible to quickly and quickly update to new wall balustrades. It is a thing.

In recent years, repairs to bridge wall balustrades such as the Metropolitan Expressway have been studied by replacing existing wall balustrades with new precast wall balustrades. As a method for renewing this type of bridge wall balustrade, for example, in Patent Document 1, the wall balustrade of an existing road bridge is cut and removed at the pavement surface of the floor slab, and a new precast wall balustrade is installed on the cut surface. The method of repairing the existing wall balustrade is disclosed.

The construction procedure will be explained based on FIGS. 11 (a) to 11 (d).
(1) First, the wall rail 21 is cut and removed from the paved surface of the floor slab 20 of the existing road bridge (Fig. 11 (a)). A cutter such as a wire saw machine is used to cut the wall balustrade 21.

(2) Next, the concrete on the cut surface on the floor slab 20 side is scraped, and the end of the reinforcing bar on the floor slab 20 side cut together with the wall rail 21 is projected to the cut surface (Fig. 11 (b)). ..

(3) Next, a loop joint that closes the L-shaped reinforcing bars 23,23 in a rectangular shape in the vertical plane in the direction perpendicular to the bridge axis between the reinforcing bar joints 22, 22 adjacent to each other in the direction perpendicular to the bridge axis of the floor slab portion 20. While arranging the reinforcing bars so as to form 24, the ends of the L-shaped reinforcing bars 23 and 23 are joined to the reinforcing bar joints 22 and 22 by the joint sleeve 25 (FIG. 11 (c)).

(4) Next, the precast wall balustrade 26 is installed on the upper side of the cut surface on the floor slab 20 side, and the precast wall balustrade 26 is closed within the vertical plane perpendicular to the bridge axis, which is arranged at the lower end of the precast wall balustrade 26. A plurality of loop reinforcing bars 27 and a loop joint 24 formed on the cut surface on the deck portion 20 side are alternately wrapped in the bridge axis direction (Fig. 11 (d)). Further, the space secured between the cut surface on the floor slab portion 20 side and the lower end portion of the precast wall balustrade 26 is referred to as the mortar filling space 27.

(5) Next, the non-shrink mortar 28 is filled in the mortar filling space 27 (Fig. 11 (d)).
The repair method for the existing wall balustrade disclosed in Patent Document 1 is carried out by the construction procedure described above.

Japanese Patent No. 5847483

In order to form the reinforcing bar joint 22 for joining the L-shaped reinforcing bars, the concrete on the cut surface on the floor slab side is scraped, and the end portion of the existing reinforcing bar cut together with the existing wall balustrade 21 on the floor slab side is used as the cut surface. It needs to be projected and requires a lot of time and effort. In addition, there is also a problem that the surrounding environment and the working environment are adversely affected by the generation of noise due to the chipping of the cut surface and the scattering of concrete dust.

The present invention has been made to solve the above problems, and by replacing the existing wall balustrade installed on a road bridge or the like with a precast wall balustrade, the existing wall balustrade can be updated quickly and quickly. The purpose is to provide a rapid renewal method for existing wall railings.

In the present invention, the existing wall balustrade installed on the floor slab of an existing road bridge having an RC structure or a PC structure is removed, and a new precast wall balustrade is installed on the cut surface to quickly fill the existing wall balustrade. It is an invention of the rapid renewal method of the existing wall balustrade that can be renewed. Deck part that is installed at predetermined intervals in the direction of the bridge axis and the direction perpendicular to the bridge axis of the existing road bridge, and wraps the reinforcing reinforcing bars joined to each post-construction anchor and closes within the vertical plane in the direction perpendicular to the bridge axis. After forming a plurality of side loop joints at predetermined intervals in the bridge axis direction, a precast wall balustrade is installed on the upper side of the deck side loop joint, and a bridge shaft is arranged at the lower end of the precast wall balustrade. A plurality of wall balustrade side loop joints that are closed in a vertical plane in the perpendicular direction are alternately wrapped with the floor slab side loop joint in the bridge axial direction, and the floor slab is provided between the precast wall balustrade and the floor slab. It is characterized in that a mortar filling space including a partial side loop joint and a precast wall balustrade side loop joint is formed, and then the mortar filling space is filled with ultrafast hard mortar.

In the post-construction anchor in the present invention, basically, a fixing hole having a predetermined depth is made in the cut surface of the floor slab portion by a drill or the like, and a rod-shaped member made of a reinforcing bar or the like is fixed in the fixing hole to fix the precast wall balustrade. Both mechanical post-construction anchors and adhesive post-construction anchors can be adopted.

In particular, for mechanical post-construction anchors, a fixing body is attached to the tip of the rod-shaped member, and the diameter of the fixing body is expanded so as to bite into the hole wall in the fixing hole, so that the rod-shaped member is reliably strengthened on the cut surface of the floor slab. Can be established in (see Figures 2 and 3).

As the mechanical post-construction anchor, for example, the metal expansion type anchor system ANZEX manufactured by Miyanaga Co., Ltd. is suitable. The post-construction anchor is a metal bottom-expanding anchor that uses a threaded reinforcing bar for the main body and has a metal bottom-expanding portion that fills a grout in the gap between the drilled portion and the threaded reinforcing bar.

In addition, the adhesive post-construction anchor is an anchor in which a rod-shaped member such as a reinforcing bar is inserted into the fixing hole and an adhesive material is filled around the rod-shaped member to fix the rod-shaped member to the cut surface of the floor slab. Yes (figure omitted).

Further, the post-construction anchors may be installed at regular intervals in the bridge axis direction and the bridge axis perpendicular direction of the deck portion, and at least two post-construction anchors may be installed in the bridge axis perpendicular direction.

In addition, the reinforcing reinforcing bars are joined to each post-construction anchor, and the reinforcing reinforcing bars adjacent to each other in the direction perpendicular to the bridge axis are closed in a loop shape such as a rectangular shape, an arc shape, or a U shape within the vertical plane in the direction perpendicular to the bridge axis. The floor slab side loop joint can be formed by wrapping it around.

In addition, intermediate post-construction anchors are installed between each post-construction anchors adjacent to each other in the direction perpendicular to the bridge axis, reinforcing reinforcing bars are joined to the intermediate post-construction anchors, and the reinforcing reinforcing bars are reinforced adjacent to both sides in the direction perpendicular to the bridge axis. It is possible to form a floor slab side loop joint that is wrapped with a reinforcing bar and closed in a loop shape such as a plurality of rectangular shapes, arc shapes, or U shapes within a vertical plane perpendicular to the bridge axis (see FIG. 6). According to this loop joint, the strength of the joint portion can be increased by forming a plurality of loop joints in the direction perpendicular to the bridge axis.

Reinforcing bars are arranged in preparation for bending load and shear load acting on the joint between the floor slab and the precast wall balustrade. For example, L-shaped reinforcing bars (L-shaped) formed in a substantially L shape. It includes both adjacent sides with the same length and different lengths (see Fig. 5 (a))), and has a lip piece protruding perpendicularly or diagonally forward to the tip of one side of the L-shaped reinforcing bar. L-shaped rebar with lip ((see Fig. 5 (b))) or U-shaped rebar formed in a substantially U shape (the length of the straight part of the U-shaped rebar is the same or different (see Fig. 5 (c)) ))), And arc-shaped reinforcing bars formed in a substantially arc shape ((see Fig. 5 (d))), etc., for the shape of floor slab side loop joints and wall balustrade side loop joints, etc. In addition, the one with the optimum shape can be used.

The L-shaped reinforcing bars and U-shaped reinforcing bars with lips shown in FIGS. 5 (b) and 5 (c) have the tip portion (lip piece) matched to the shape of the precast wall balustrade side loop joint, and are the loop joints. By matching the shape of the floor slab side and the wall balustrade side, the mechanical behavior of the loop joint can be transmitted well.

In addition, as a method of connecting the reinforcing reinforcing bar to the upper end of the rod-shaped member, a mechanical joint using a metal joint sleeve or a mechanical lap joint (for example, an OS hoop clip joint (registered trademark of Okabe Co., Ltd.)) is used. Can be used.

As shown in FIG. 3, the rod-shaped member is integrally formed with an L-shaped reinforcing bar formed in a substantially L shape, a U-shaped reinforcing bar formed in a substantially U shape, or an arc-shaped reinforcing bar formed in a substantially arc shape. By forming and using the reinforcing bar itself as a reinforcing bar, it is possible to omit joining the rod-shaped member and the reinforcing bar, and it is possible to update to the new wall balustrade in a shorter time. Further, the rod-shaped member shown in FIG. 3 can be formed of a screw fushi reinforcing bar, a deformed steel bar, or the like.

As the ultrafast hard mortar, for example, Base Tight Grout Q-EX (manufactured by Chichibu Concrete Industry Co., Ltd.) is suitable. Base Tight Grout Q-EX is an ultra-fast-hardening non-shrink mortar in which various admixtures are premixed based on ultrafast-hardening cement, and a predetermined strength can be obtained in a short time. In addition, it has high filling property and excellent fluidity. The standard formulation and physical property values of Base Tight Grout Q-EX are as shown in Table 1 and FIG.

According to the present invention, the existing wall balustrade is cut horizontally from the lower end and removed, and then a post-construction anchor is installed on the cut surface on the floor slab side to serve as an anchor for attaching the precast wall balustrade. It is possible to save labor in the cutting work of the cut surface, and it is possible to easily update the existing wall balustrade by replacing it with the precast wall balustrade in an extremely short time.

In addition, problems that adversely affect the surrounding environment and working environment due to noise generated by chipping work and scattering of concrete dust can be solved.

The existing road bridge that was rapidly updated by replacing it with a precast wall balustrade is illustrated. Fig. 1 (a) is a partial vertical cross-sectional view in the direction perpendicular to the bridge axis, and Fig. 1 (b) and (c) are figures, respectively. It is a partial cross-sectional view of the eye line and the roll line in 1 (a). An enlarged bottom anchor, which is an example of a post-construction anchor, is shown. FIG. 2 (a) is an enlarged view of part C in FIG. 1 (a) showing the installation state, and FIG. FIG. 2 (c) is a two-two line cross-sectional view in FIG. 2 (b). The bottom-expanded anchor, which is a modified example of the post-construction anchor, is shown. FIG. 3 (a) shows an enlarged view of the C part in FIG. 1 (a) showing the installation state, and FIG. A side view, FIG. 3 (c) is a cross-sectional view taken along the line in FIG. 3 (b). The joint structure between the rod-shaped member of the bottom expansion anchor and the L-shaped reinforcing bar is illustrated. FIG. 4 (a) is a side view, FIG. 4 (b) is a plan view, and FIG. 4 (c) is in FIG. 4 (a). It is a cross-sectional view taken along the line. An example of the reinforcing bar is illustrated, and FIGS. 5 (a), (b), (c), and (d) show the side surfaces of the L-shaped reinforcing bar, the L-shaped reinforcing bar with a lip, the U-shaped reinforcing bar, and the arc-shaped reinforcing bar, respectively. It is a figure. It illustrates another embodiment of the present invention, and is a partial vertical cross-sectional view of an existing road bridge that has been rapidly updated in the direction perpendicular to the bridge axis. The joints between the precast wall railings adjacent to each other in the bridge axis direction are shown. FIG. 7 (a) is a perspective view showing the state before joining, and FIG. 7 (b) is a cross-sectional view showing the state after joining. , FIG. 7 (c) is a vertical cross-sectional view showing a state after joining. The construction procedure of the present invention is illustrated, FIG. 8 (a) is a partial vertical cross-sectional view of the existing road bridge before renewal in the direction perpendicular to the bridge axis, and FIG. 8 (b) is after cutting and removing the existing wall balustrade. It is a partial vertical cross-sectional view of the existing road bridge in the direction perpendicular to the bridge axis. The construction procedure of the present invention is illustrated, FIG. 9 (a) is a partial vertical cross-sectional view in the direction perpendicular to the bridge axis in a state where the bottom expansion anchor is installed on the cut surface of the floor slab, and FIG. 9 (b) is the bottom expansion. A partial vertical cross-sectional view in the direction perpendicular to the bridge axis in a state where a reinforcing reinforcing bar is joined to the anchor to form a loop joint on the floor slab side. It is a partial vertical cross-sectional view in the direction perpendicular to the bridge axis. It is a graph which shows the physical property value of base tight grout Q-EX, and FIGS. 10 (a) and 10 (b) are graphs which show the initial compression strength and the long-term compression strength, respectively. The construction procedure of the conventional construction method for updating the existing wall balustrade using the precast wall balustrade is illustrated, and FIGS. 11 (a) to 11 (d) are perspective views.

FIGS. 1 to 5 show the wall railings of the existing road bridge updated by the replacement with the precast wall railings. In the figure, the precast wall balustrade 2 is installed on the cut surface from which the existing wall balustrade of the road deck portion 1 has been cut and removed. Further, the precast wall balustrades 2 are installed adjacent to each other in the bridge axis direction of the deck portion 1. Then, each precast wall balustrade 2 is joined on the cut surface of the deck portion 1 and is joined to each other in the bridge axis direction.

Specifically explaining the joint portion between the floor slab portion 1 and each precast wall balustrade 2, a plurality of bottom expansion anchors (post-construction anchors) 3 are installed on the cut surface of the existing wall balustrade of the floor slab portion 1.

The bottom expansion anchor 3 includes a wedge 5 and a diameter expansion sleeve 6 inserted into the fixing hole 4 in order from the bottom of the hole, and a rod-shaped member 7 penetrating the diameter expansion sleeve 6 and connected to the wedge 5. At least two plates of the plate 1 are installed at predetermined intervals in the direction perpendicular to the bridge axis, and a plurality of plates are installed at predetermined intervals in the bridge axis direction.

The diameter-expanding sleeve 6 is formed in a cylindrical shape having an outer diameter inscribed in the fixing hole 4 formed in the cut surface of the deck portion 1, and the portion 6a below the substantially middle portion in the pipe axis direction is above the upper portion 6b. It is thickly formed and has high rigidity.

Further, in the lower portion 6a of the diameter-expanding sleeve 6, a plurality of slits 6c continuous in the pipe axis direction are formed at equal intervals in the circumferential direction, and the slits 6c and 6c are formed about the middle portion in the pipe axis direction as an axis. A diameter-expanded portion 8 that deforms and expands in diameter is formed on the hole wall side of the fixing hole 4.

The wedge 5 is formed in a cylindrical shape having an outer diameter inscribed in the fixing hole 4, and has a screw hole whose inner circumference penetrates in the pipe axis direction. Further, a portion above the middle portion in the pipe axis direction forms a conical tapered portion 5a whose diameter gradually decreases toward the upper end. Then, the tip of the rod-shaped member 7 is screwed into the screw hole to be attached to the tip of the rod-shaped member 7.

The rod-shaped member 7 is formed of a screw fushi reinforcing bar or the like, and a male screw continuous in the material axis direction is formed on the outer peripheral surface. Further, the tip side of the rod-shaped member 7 penetrates the diameter-expanding sleeve 6 and is screwed into the screw hole of the wedge 5, and is inserted into the fixing hole 4 of the deck portion 1 together with the diameter-expanding sleeve 6 and the wedge 5. ..

Then, by strongly driving the diameter-expanding sleeve 6 into the bottom of the fixing hole 4, the tip end side of the rod-shaped member 7 is firmly fixed in the fixing hole 4 by the diameter-expanding sleeve 6. In this case, by strongly driving the diameter-expanding sleeve 6 into the bottom of the fixing hole 4, the space between the slits 6c and 6c (diameter-expanding portion 8) of the lower portion 6a of the diameter-expanding sleeve 6 is fixed by the tapered portion 5a of the wedge 5. The tip side of the rod-shaped member 7 is fixed in the fixing hole 4 by being pushed open so as to bite into the inner wall of the hole 4.

A grout material 9 (mortar or the like) for preventing rusting of the fixing portion of the rod-shaped member 7 is filled between the rod-shaped member 7 and the peripheral wall of the fixing hole 4. Further, the rod-shaped member 7 may have a male screw formed in the tip portion of a steel bar (round steel) to be screwed into the screw hole of the wedge 5.

Further, for driving the diameter-expanding sleeve 6, a driving jig a that is longer than the rod-shaped member 7 and has a cylindrical shape having an inner diameter substantially the same as that of the diameter-expanding sleeve 6 is used.

An L-shaped reinforcing bar 10 is joined as a reinforcing reinforcing bar to the upper end of each rod-shaped member 7 fixed to the cut surface of the deck portion 1 in this way.

The L-shaped reinforcing bar 10 is formed in a substantially L shape from a vertical portion 10a extending upward from the upper end of the rod-shaped member 7 by a predetermined length and a horizontal portion 10b extending a predetermined length from the upper end portion of the vertical portion 10a in the direction perpendicular to the bridge axis. There is. Then, the vertical portion 10a of each L-shaped reinforcing bar 10 is joined to the upper end portion of the rod-shaped member 7, and the horizontal portions 10b are adjacent to each other in the direction perpendicular to the bridge axis and are overlapped with each other in the bridge axis direction in substantially the same plane. There is.

As a result, on the cut surface of the removed floor slab 1 of the existing wall balustrade, a plurality of deck side loop joints 11 that are closed in a substantially rectangular shape within the vertical plane in the direction perpendicular to the bridge axis are predetermined in the bridge axis direction. Reinforcements are arranged at intervals.

The L-shaped reinforcing bar 10 is formed of the same screw-shaped reinforcing bar or deformed steel bar as the rod-shaped member 7, and is shown in FIGS. 5 (b), (c), and (d) instead of the L-shaped reinforcing bar 10. L-shaped reinforcing bars with lips, U-shaped reinforcing bars, arc-shaped reinforcing bars, etc. may be used. Reference numeral 10c is a lip piece projecting diagonally downward and forward from the tip of the horizontal portion 10b.

In the L-shaped rebar and U-shaped rebar with a lip as shown in the figure, the tip part (lip piece) is adapted to the shape of the precast wall balustrade side loop joint, and the shape of the loop joint is the floor slab side and the wall balustrade. By matching the sides, the mechanical behavior of the loop joint can be transmitted well.

As a method of joining the L-shaped reinforcing bar 10 to the upper end of the rod-shaped member 7, a mechanical joint or a mechanical lap joint with a metal sleeve is used, and here, an OS hoop clip joint is particularly adopted (Fig. 4 (Fig. 4). See a), (b), (c)).

In the case of joining with an OS hoop clip joint, the upper end of the rod-shaped member 7 and the lower end of the vertical portion 10a of the L-shaped reinforcing bar 10 are inserted into the joint sleeve 12 from above and below to overlap each other, and the rod-shaped member is inserted from the outside of the joint sleeve 12. By press-fitting the pin 13 into the overlapping portion between 7 and the L-shaped reinforcing bar 10 (between the upper end of the rod-shaped member 7 and the vertical portion 10a of the L-shaped reinforcing bar 10), the L-shaped reinforcing bar is pressed into the upper end of each rod-shaped member 7. 10 are joined (see Figures 4 (a)-(c)).

As shown in FIG. 3, the rod-shaped member 7 is formed into, for example, a substantially L-shape, and itself is used as the L-shaped reinforcing bar 10, so that the joining between the rod-shaped member 7 and the L-shaped reinforcing bar 10 is omitted. And the update to the precast wall balustrade can be done in a shorter time.

Further, in order to drive the rod-shaped member 7 having the shape shown in FIG. 3 into the fixing hole 4 on the cut surface, a driving jig b as shown is used. The driving jig b is formed in a cylindrical shape having an inner diameter substantially the same as that of the diameter-expanding sleeve 6, and a slit c on the side portion for avoiding a curved portion of the rod-shaped member 7 has a constant length from the lower end portion in the pipe axis direction toward the upper end direction. It is formed.

The precast wall railings 2 are arranged adjacent to each other in the bridge axis direction on the upper side of the cut surface on which the plurality of deck side loop joints 11 are arranged in this way.

A widening portion 2a that widens in the direction perpendicular to the bridge axis is continuously formed at the lower end of each precast wall balustrade 2 in the direction perpendicular to the bridge axis, and the lower end surface of each precast wall balustrade 2 is formed in a vertical plane perpendicular to the bridge axis. A plurality of wall railing side loop joints 14 that are closed in a substantially rectangular shape are arranged.

The wall balustrade side loop joint 14 is alternately wrapped with the floor slab side loop joint 9 in the bridge axis direction, and the floor is placed between the cut surface on the deck portion 1 side and the lower end surface of each precast wall balustrade 2. A mortar filling space 15 is formed so as to include the plate side loop joint 11 and the wall balustrade side loop joint 14. Then, the ultrafast hard mortar 16 is filled in the mortar filling space 15.

As the ultrafast hard mortar 16, for example, Base Tight Grout Q-EX (manufactured by Chichibu Concrete Industry Co., Ltd.) is suitable.

With the above configuration, the precast wall balustrade 2 is integrally joined and installed on the cut surface of the floor slab portion 1 from which the existing wall balustrade has been cut and removed.

FIG. 6 illustrates another embodiment of the present invention, in which an intermediate bottom expansion anchor 17 is installed between the bottom expansion anchors 3 and 3 adjacent to each other in the direction perpendicular to the bridge axis, and an intermediate L-shaped reinforcing bar is installed in the intermediate bottom expansion anchor 17. Deck side that joins 18 and wraps the intermediate L-shaped reinforcing bar 18 with L-shaped reinforcing bars 10 adjacent to both sides in the direction perpendicular to the bridge axis and closes them in a plurality of rectangular shapes in the vertical plane in the direction perpendicular to the bridge axis. It is a loop joint 11. According to this embodiment, by forming a plurality of loop joints on the cut surface of the deck portion 1 in the direction perpendicular to the bridge axis, the precast wall railing 2 can be joined more firmly on the floor slab portion 1. ..

The precast wall railings 2 and 2 adjacent to each other in the bridge axis direction are joined by the configuration shown in FIGS. 7 (a) to 7 (b). Briefly, a concave groove 19 is formed on the joint end surface of one precast wall balustrade 2, and a T-shaped convex joint 20 is projected on the joint end face of the other precast wall balustrade 2.

Then, the web portion 20a of the convex joint 20 is inserted into the concave joint 19, and the ultrafast curing mortar 16 is filled around the web portion 20a in the concave joint 19.

Next, the construction procedure of the present invention will be described.
(1) First, remove the existing wall rail 21. The existing wall balustrade 21 is removed by cutting it almost horizontally on the floor slab surface 1a or the floor slab surface 1a of the floor slab portion 1 (see FIG. 8 (a)).

(2) Next, a fixing hole 4 for fixing the bottom expansion anchor 3 is formed on the cut surface of the deck portion 1. At least two fixing holes 4 are formed at predetermined intervals in the direction perpendicular to the bridge axis, and a plurality of fixing holes 4 are formed at predetermined intervals in the bridge axis direction (see FIG. 8 (b)). The inner diameter and depth of the fixing hole 4 and the installation interval are determined in consideration of the outer diameter dimension of the bottom expansion anchor 3 and the impact load acting on the precast wall railing column 2 after installation.

(3) Next, the bottom expansion anchor 3 is installed in each fixing hole 4. The bottom expansion anchor 3 is inserted into the fixing hole 4 by attaching the diameter expansion sleeve 6 and the wedge 5 to the tip of the rod-shaped member 7. Then, the rod-shaped member 7 is fixed to the cut surface of the deck portion 1 by strongly driving the diameter-expanding sleeve 6 into the bottom of the fixing hole 4 using the driving jig a (FIGS. 9 (b) and 2 (a). ), (B)).

(4) Next, the L-shaped reinforcing bar 10 is joined to the upper end of each rod-shaped member 7. That is, the horizontal portions 10b and 10b of the L-shaped reinforcing bars 10 and 10 joined to the upper ends of the rod-shaped members 7 and 7 adjacent to each other in the direction perpendicular to the bridge axis are wrapped in the vertical plane in the direction perpendicular to the bridge axis and the vertical portion. The lower ends of 10a and 10a are joined to the upper ends of the rod-shaped members 7 and 7 (see FIGS. 10 (b) and 1 (b)).

The rod-shaped member 7 and the L-shaped reinforcing bar 10 are joined by an OS hoop clip joint using a joint sleeve 12 and a pin 13. That is, the upper end portion of the rod-shaped member 7 and the lower end portion of the vertical portion 10a of the L-shaped reinforcing bar 10 are inserted into the joint sleeve 12, and they are overlapped with each other in the joint sleeve 12.
Then, the pin 13 is press-fitted between the upper end portion of the rod-shaped member 7 and the vertical portion 10a of the L-shaped reinforcing bar 10 from the pin hole 12a formed in the side surface portion of the joint sleeve 12 (FIGS. 4 (a) to 4 (c)). reference). As a result, the floor slab side loop joint 11 that closes in a rectangular shape within the vertical plane in the direction perpendicular to the bridge axis can be arranged on the cut surface of the deck portion 1.

(5) Next, the precast wall balustrades 2 are installed adjacent to each other in the bridge axis direction on the upper side of the cut surface of the deck portion 1, and in the vertical plane in the direction perpendicular to the bridge axis on the lower end surface of each precast wall balustrade 2. A plurality of wall balustrade side loop joints 14 arranged so as to be closed in a rectangular shape are alternately wrapped with the floor slab side loop joint 11 in the bridge axis direction.
Further, a mortar filling space 15 including the floor slab side loop joint 11 and the wall balustrade side loop joint 14 is formed between the cut surface of the deck portion 1 and the lower end surface of each precast wall balustrade 2.

(6) Next, concrete formwork (not shown) is installed on both sides between the floor slab 1 and the precast wall balustrade 2 so as to block the mortar filling space 15 from both sides. Then, the ultrafast hard mortar 16 is filled in the mortar filling space 15.

By the above construction procedure, the existing wall balustrade installed on the floor slab of the existing road bridge consisting of RC structure or PC structure can be replaced with a new precast wall balustrade to easily update the existing wall balustrade in a short time. be able to.

According to the present invention, the existing wall balustrade can be renewed quickly and quickly by replacing the existing wall balustrade installed on a road bridge or the like with a precast wall balustrade.

1 Floor slab of existing road bridge
2 Precast wall balustrade
3 Expanded bottom anchor (post-construction anchor)
4 Fixing hole
5 wedge
5a taper part
6 Expanded sleeve
6a Lower part
6b Upper part
6c slit
7 Rod-shaped member
8 Diameter expansion part
9 Grout material
10 L-shaped rebar (reinforcing rebar)
10a vertical part
10b horizontal part
11 Floor slab side loop joint
12 Fitting sleeve
13 pin
14 Wall balustrade loop fitting
15 Mortar filling space
16 Super fast mortar
17 Intermediate bottom expansion anchor
18 Intermediate L-shaped rebar (reinforcing rebar)
19 Concave fitting
20 Convex joint
20a web section

Claims (5)

The existing wall balustrade installed on the floor slab of an existing road bridge consisting of RC structure or PC structure is removed, and a new precast wall balustrade is installed on the removed surface to update the existing wall balustrade. In the rapid renewal method, the existing wall balustrade is cut and removed in the vicinity of the floor slab surface or the floor slab surface of the floor slab portion to form a horizontal cut surface in the floor slab portion, and a fixing hole is made in the horizontal cut surface. A rod-shaped member is fixed in the fixing hole, and a plurality of post-construction anchors are arranged at predetermined intervals in the bridge axis direction and the bridge axis perpendicular direction of the existing road bridge, and are joined to the respective post-construction anchors to arrange a plurality of reinforcing reinforcing bars. while muscle, after multiple formed at predetermined intervals slab side loop coupling for closing by wrapping the reinforcement rebar each other in the vertical plane of the bridge axis perpendicular to Hashijiku direction, of the floor plate portion-loop joint A new precast wall balustrade is placed on the upper side, and a plurality of precast wall balustrade side loop joints that are laid at the lower end of the precast wall balustrade and are closed within the vertical plane in the direction perpendicular to the bridge axis are placed on the deck side. The loop joint and the bridge axial direction are alternately wrapped, and the floor slab side loop joint and the precast wall balustrade side loop joint are included between the horizontal cut surface of the floor slab and the lower end of the precast wall balustrade. A rapid renewal method for existing wall railings, which comprises forming a mortar filling space, and then filling the mortar filling space with ultrafast hard mortar. The rapid renewal method for existing wall balustrades according to claim 1, wherein the rapid renewal method for existing wall balustrades includes the following steps.
(1) A step of forming a plurality of fixing holes on the cut surface on the deck side at predetermined intervals in the bridge axis direction and the bridge axis perpendicular direction.
(2) A step of attaching a wedge and a diameter-expanding sleeve to the tip of a rod-shaped member, and inserting the wedge and the diameter-expanding sleeve into the fixing hole together with the tip of the rod-shaped member.
(3) A step of inserting a driving jig between the rod-shaped member and the fixing hole and driving the diameter-expanding sleeve with the driving jig to expand the diameter of the diameter-expanding sleeve.
(4) A step of pulling out the driving jig from between the rod-shaped member and the fixing hole and filling a grout material between the rod-shaped member and the fixing hole. In the rapid renewal method of the existing wall balustrade according to claim 1 or 2, the rod-shaped member is formed into an L-shaped reinforcing bar formed in a substantially L shape, a U-shaped reinforcing bar formed in a substantially U shape, or a substantially arc shape. A rapid renewal method for existing wall balustrades , which is an arc-shaped reinforcing bar and is itself used as the reinforcing reinforcing bar. In the rapid renewal method of the existing wall balustrade according to any one of claims 1 to 3, the driving jig is formed in a cylindrical shape through which the rod-shaped member can penetrate, and the curved portion of the rod-shaped member can be avoided on the side portion. A rapid renewal method for existing wall balustrades, which is characterized by the provision of various slits. A wedge and a diameter-expanding sleeve installed in a fixing hole formed in a cut surface of the floor slab, which is a post-construction anchor used in the rapid renewal method of the existing wall balustrade according to any one of claims 1 to 4. A driving jig that is inserted into the fixing hole, penetrates the diameter-expanding sleeve, and is connected to the wedge, and the diameter-expanding sleeve is inserted between the fixing hole and the rod-shaped member. A post-construction anchor characterized in that the diameter is expanded along the outer peripheral surface of the wedge by being driven through the wedge.

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