Wall balustrade integrated floor slab and method for manufacturing the same

Abstract

To reduce work on site.SOLUTION: A precast wall balustrade integrated floor slab 1 comprises: a floor slab part 2; and a wall balustrade part 3 installed integrally with the floor slab part 2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a wall-rail integrated floor slab and a manufacturing method thereof. [Background technology]

[0002] The wall parapets of bridges and expressways are sometimes made of precast in order to reduce the construction period and the amount of on-site work. Patent Document 1 describes the attachment of precast wall parapets to deck slabs on-site. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-148158 A Summary of the Invention [Problem to be solved by the invention]

[0004] Although the use of precast wall balustrades can improve the efficiency of on-site work, the work of attaching the wall balustrade to the deck slab is still required on-site. The present invention aims to provide a deck slab and wall balustrade that can further reduce the amount of on-site work. [Means for solving the problem]

[0005] According to the present invention, there is provided a precast wall-parapet-integrated deck having a deck portion and a wall parapet portion cast integrally with the deck portion. Effect of the Invention

[0006] According to the present invention, a precast wall-rail integrated deck component is provided in which the deck section and the wall-rail section are cast as a single unit, thereby further reducing on-site work. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of an integrated deck and steel girder. [Diagram 2] FIG. 2 is a cross-sectional view of the steel girder and the integrated deck taken along line AA in FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view of the steel girder and the integrated deck taken along line BB in FIG. 1. [Figure 4] FIG. [Diagram 5] A cross-sectional view of the connection between the wall parapet and the deck. [Figure 6] FIG. 6 is a cross-sectional view taken along line CC in FIG. 5. [Figure 7] 10A to 10C are schematic diagrams showing a method for forming a box cutout portion and a method for filling the box with a filler material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] With reference to the drawings, an embodiment of the wall-parapet integrated deck (hereinafter referred to as the integrated deck 1) of the present invention will be described. FIG. 1 is a perspective view of the integrated deck 1 and the steel girder 6, FIG. 2 is a cross-sectional view of the steel girder 6 and the integrated deck 1 along the line AA in FIG. 1, FIG. 3 is a cross-sectional view of the steel girder 6 and the integrated deck 1 along the line BB in FIG. 1, FIG. 4 is a cross-sectional view (plan view) of the integrated deck 1 along the line CC in FIG. 3, FIG. 5 is a cross-sectional view of the connection between the deck part 2 and the wall parapet part 3, and FIG. 6 is a cross-sectional view along the line CC in FIG. 5. The integrated deck 1 of this embodiment is applied to a bridge, but the present invention is not limited to bridges. In the following description and drawings, the direction parallel to the bridge axis, i.e., the longitudinal direction of the steel girder 6, is referred to as the bridge axis direction X, and the direction perpendicular to the bridge axis direction X, i.e., the width direction of the steel girder 6, is referred to as the bridge axis perpendicular direction Y. The bridge axis direction X and the bridge axis perpendicular direction Y are perpendicular to each other, and usually, the bridge axis direction X and the bridge axis perpendicular direction Y are perpendicular to the vertical direction Z. However, at least one of the bridge axis direction X and the bridge axis orthogonal direction Y does not have to be perpendicular to the vertical direction Z. As an example, the steel girder 6 is made of four steel beams 61, on which a large number of precast integrated deck slabs 1 are arranged in the bridge axis direction X. The heights (beam depths) of the steel beams 61 are the same, but may be different.

[0009] (Overall configuration of integrated deck 1) The integral deck 1 is a precast concrete member having a deck 2 and a wall balustrade 3 cast integrally with the deck 2. There is no clear boundary such as a joint between the deck 2 and the wall balustrade 3, but here, as shown in Figs. 3 and 5, the part below the upper surface 21 of the deck 2 is the deck 2, and the part above the upper surface 21 of the deck 2 is the wall balustrade 3. The lower part of the wall balustrade 3, that is, the part where the rate of increase in the thickness of the wall balustrade 3 is large and the part below it corresponds to the ground cover 4. In this embodiment, the ground cover 4 is a part of the wall balustrade 3. The length of the integral deck 1 in the bridge axis direction X is, for example, 1.5 to 3 m, and the length in the direction perpendicular to the bridge axis Y is approximately equal to the overall width of the steel girder 6.

[0010] As shown in FIG. 3, the deck section 2 of the integral deck 1 has a flat body 22 and a plurality of ribs 23 provided on the underside of the body 22. The ribs 23 are provided at positions facing the steel beams 61, and the deck section 2 is fixed to the steel girder 6 at the positions of the ribs 23. The integral decks 1 are arranged one by one in the bridge axis direction X, and the gaps G1 between the adjacent deck sections 2 in the bridge axis direction X are filled with a filler (filling material) M1, preferably made of non-shrink mortar. The joints between the deck section 2 and the adjacent deck sections 2 in the bridge axis direction X, i.e., the filling portions of the filler M1, are parallel to the bridge axis orthogonal direction Y. As shown in FIG. 1, the gaps G2 between the wall balustrades 3 of the integral deck 1 are also filled with the filler M2.

[0011] Conventionally, the gap G1 between the deck slabs 2 is often several tens of centimeters to 1 meter. For this reason, the filling process of the filler M1 is time-consuming, and the possibility of construction is easily affected by the weather. In this embodiment, the gap G1 between the deck slabs 2 is very small, about 10 to 30 mm, and the construction period of the filler M1 is short. The mortar filled in the gap G1 between the deck slabs 2, especially the non-shrink mortar, can be constructed even in slightly bad weather, and there are few factors that delay the construction period due to weather. The size of the gap G2 of the wall parapet 3 is also about the same as the gap G1, and the construction period of the filler M2 is short, and there are few factors that delay the construction period.

[0012] (Tension material) The deck section 2 is compressed in the bridge axis direction X and the bridge axis orthogonal direction Y for the main purpose of preventing cracks. As shown in Figs. 2 and 4, the deck section 2 has a plurality of first tendons 25 of a pretensioning method extending in the bridge axis orthogonal direction Y. The plurality of first tendons 25 are arranged inside the formwork of the integrated deck 1 before concrete is poured into the integrated deck 1. Pretension (pretension) is applied by a jack (not shown) installed outside. In this state, concrete is poured, and the pretension is released after the concrete hardens, so that a compressive force in the bridge axis orthogonal direction Y can be applied to the concrete. Since the first tendons 25 are attached to the concrete, the compressive force of the concrete is maintained even if the pretension is released. As shown in Fig. 2, the plurality of first tendons 25 are arranged in two rows of 12 columns, but the number and arrangement are not limited.

[0013] As shown in Figs. 3 and 4, the deck section 2 has a plurality of post-tensioned second tendons 26 extending in the bridge axis direction X. The second tendons 26 are inserted into a sheath (not shown) after concrete is poured and gaps G1 between the deck sections 2 are filled with filler M1. Then, post-tension (tensile force) is applied in the bridge axis direction X by a jack (not shown) installed outside. The sheath is provided in advance inside the deck section 2 and in the gaps G1 between the deck sections 2. The tensile force of the second tendons 26 remains applied even during the service of the integrated deck 1. Since the second tendons 26 penetrate the plurality of deck sections 2, a compressive force can be applied to the plurality of deck sections 2 at the same time. The range (number) of the deck sections 2 to which the compressive force is applied is not limited. In this embodiment, the second tendons 26 are inserted from the deck section 2 on one end side of the bridge to the deck section 2 on the other end side. The second tendons 26 may be inserted only in the deck 2 of a portion of the bridge, in which case the ends of the second tendons 26 are bent and exposed from the underside of the deck 2, allowing post-tensioning to be applied from the underside of the deck 2. As shown in Fig. 3, the multiple second tendons 26 are mainly arranged in one row between the ribs 23, but the number and arrangement are not limited.

[0014] (Connection structure between the deck slab 2 and the wall parapet 3) In order to ensure the unity of the wall balustrade 3 and the deck 2, the integrated deck 1 has first and second reinforcing bars 41, 42 connecting the wall balustrade 3 and the deck 2 as shown in Figs. 5 and 6. The first and second reinforcing bars 41, 42 are mainly provided in the wall balustrade 3. The first and second reinforcing bars 41, 42 extend generally in the height direction (Z direction) of the wall balustrade 3, with upper ends 41A, 42A near the top of the wall balustrade 3 and lower ends 41B, 42B below the upper surface 21 of the deck 2. In order to ensure the connection strength of the wall balustrade 3 and the deck 2, the lower ends 41B, 42B of the first and second reinforcing bars 41, 42 are enlarged in diameter. The upper end 41A of the first reinforcing bar is not enlarged, and the upper end 42A of the second reinforcing bar is enlarged, but an enlarged portion can be provided as appropriate to obtain the necessary connection strength between the wall parapet portion 3 and the deck portion 2. As shown in FIG. 6, the first and second reinforcing bars 41, 42 are arranged relatively closely together, and some of them are above the box punch portion 27 described below. However, by enlarging the lower ends 41B, 42B of the first and second reinforcing bars 41, 42, the lengths of the first and second reinforcing bars 41, 42 can be reduced, thereby preventing interference between the first and second reinforcing bars 41, 42 and the box punch portion 27.

[0015] To ensure the strength of the wall parapet 3 itself, a loop-shaped third reinforcing bar 43 (not shown in Fig. 6) is placed inside the wall parapet 3. To ensure the strength of the connection between the deck slab 2 and the wall parapet 3, a fourth reinforcing bar 44 is placed connecting the deck slab 2 and the ground covering 4. A fifth reinforcing bar (stirrup) 45 is placed in the deck slab 2 (see Fig. 6). The fourth reinforcing bar 44 and the fifth reinforcing bar 45 are placed in positions that avoid the box cutout portion 27.

[0016] (Box removal section 27) In order to seal the end of the first tendon 25 with the filler M3 after the pretensioning of the first tendon 25, a box-out portion 27 is provided in the deck section 2. FIG. 7 shows a method of forming the box-out portion 27 and a method of filling the filler M3. FIG. 7(a) shows a side cross-sectional view of the deck section 2 before concrete is poured. The first tendon 25 penetrates a formwork 28 for forming the box-out portion 27 and extends outward. The first tendon 25 is tensioned by a jack, and in this state, concrete for the integrated deck 1 is poured as shown in FIG. 7(b). As a result, the box-out portion 27 is formed in the deck section 2. After the concrete hardens, a part of the first tendon 25 is removed (cut) so that the end 25A of the first tendon 25 is accommodated in the box-out portion 27. In this way, the box-out portion 27 is a space that accommodates the end 25A of the first tendon 25.

[0017] Next, as shown in FIG. 7(c), the opening 29 of the box-out portion 27 is covered with the covering material 5. The covering material 5 may be a general formwork, vinyl tape, or vinyl sheet. At this time, a filling port 51 for the filler M1 and an air outlet 52 are provided in the opening 29 of the box-out portion 27. The filling port 51 and the air outlet 52 may be openings provided in the covering material 5, or the filling port 51 and the air outlet 52 may be formed by not covering a part of the opening 29 with the covering material 5. Next, as shown in FIG. 7(d), the filling material M3 is injected into the box-out portion 27 from the filling port 51 while the air in the box-out portion 27 is exhausted from the air outlet 52. The part of the first tendon 25 exposed in the box-out portion 27 is sealed with the filling material M3, and corrosion is suppressed. The filling material M3 can be general mortar. The box-out portion 27 opens only on the side of the deck portion 2. Since the filler M3 can be directly filled into the box punching section 27, there is no need to create a long filling path, and the amount of filler M3 used can be reduced. Since the filling section of the filler M3 is limited to the box punching section 27, the configurations of the filling port 51 and the air exhaust port 52 can be simple as described above.

[0018] 4, another box cutout portion 27A is provided on the side opposite to the box cutout portion 27 of the deck slab portion 2. The box cutout portion 27A is a space that accommodates the fixing side end of the first tendon 25, and an fixing plate (not shown) is exposed. For this reason, although a detailed explanation is omitted, filler M3 is filled in the same way as the box cutout portion 27 as a measure to inhibit corrosion of the plate.

[0019] (Manufacturing method of integrated deck 1) A manufacturing method of the integrated deck 1 will be described. First, the first tendon 25 and the first to fifth reinforcing bars 41 to 45 are arranged, and a formwork for the integrated deck 1 is created. The first tendon 25 is tensioned, and concrete is poured from an injection port (not shown) provided in the part of the formwork corresponding to the deck section 2. The concrete fills the deck section 2, and further fills the wall balustrade section 3. The formwork is removed, and the first tendon 25 is processed and the filler M3 is filled into the box-out sections 27, 27A according to the above-mentioned procedure. The above steps can be performed in advance in a factory, which makes it possible to reduce on-site work and prevent process delays.

[0020] (Installation method of integrated deck 1) The multiple integrated deck slabs 1 manufactured as described above are transported to the site and installed by a lifting machine. Next, the gap G1 between the deck slabs 2 is filled with the filler M1, and the gap G2 between the wall balustrades 3 is filled with the filler M2. Conventionally, a process of attaching the wall balustrade to the deck slab was required after the deck slab was installed, but in this embodiment, the deck slab 2 and the wall balustrade 3 can be attached at the same time. In addition, since the gap G1 between the deck slabs 2 and the gap G2 between the wall balustrades 3 are very narrow, the filling of the fillers M1 and M2 can also be performed quickly. After the installation of the required number of integrated deck slabs 1 and the filling of the fillers M1 and M2 are completed, the second tension member 26 is inserted into the multiple deck slabs 2 and tensioned. After that, the upper surface 21 of the deck slab 2 is paved with asphalt. The installation of the integrated deck slab 1 is completed by the above process. [Explanation of symbols]

[0021] 1 Wall balustrade integrated floor slab (integrated floor slab) 2 Floor slab section 3 Wall parapet 5 Covering material 25 First Tendon 26 Second Tendon 27 Box removal section 41~45 1st~5th rebars 51 Filling port 52 Air exhaust port M1~M3 1st~3rd filler

Claims

1. A precast wall-rail integrated deck having a deck section and a wall-rail section cast integrally with the deck section.

2. The wall has a reinforcing bar extending generally in the height direction of the wall railing portion, The deck section has a first tendon of a pretensioning type extending parallel to a joint with another deck section, 2. The wall balustrade integrated deck as described in claim 1, wherein the lower end of the reinforcing bar is enlarged in diameter, and the lower end is located above the first tendon and below the upper surface of the deck portion.

3. A wall-railing integrated deck as described in claim 1 or 2, having a box cutout portion that accommodates an end of the first tension member and opens only to the side of the deck portion, and a filler material filled in the box cutout portion.

4. 3. The wall balustrade integrated deck according to claim 1, wherein the deck portion has a post-tensioned second tendon extending in a direction perpendicular to the joint.

5. A method for manufacturing a precast deck with integrated wall balustrade, which comprises casting the deck and the wall balustrade as a single unit.

6. Before the deck portion is cast, a first tendon extending parallel to a joint portion with another deck portion is placed and tensioned; After casting the deck section, removing a part of the first tendon so that an end of the first tendon is accommodated in a box-out portion of the deck section, and filling the box-out portion with a filler material; The filling of the filler material includes: covering the opening of the box cutout portion with a covering material so that the opening has an inlet for filling the filler material and an air outlet; The manufacturing method of the wall balustrade integrated deck plate according to claim 5, further comprising: injecting the filler from the filling port while evacuating the air from the box cutout portion through the air exhaust port.

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