JPH0219432Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a synthetic side wall structure constituting the peripheral wall of a concrete container used as a water storage tank.

[Prior Art] Conventionally, as a side wall structure constituting the peripheral wall of a concrete container, (1) as disclosed in Japanese Patent Application Laid-Open No. 144015/1983, the outer peripheral wall has a large number of vertically divided parts. Side wall structure constructed from precast concrete members, with the inner peripheral wall constructed by pouring cast-in-place concrete, (2) Special Publication No. 42-4811
As announced in the publication, a side wall is made by arranging a large number of precast concrete members with multiple vertical ribs on both the left and right sides of the outer surface in a row in the vertical direction and in the direction around the container, and connecting them with PC tension members. The structure etc. are known.

[Problems to be solved by the invention] In the case of the side wall structures in (1) and (2) above, the strength of the side walls is weak and the precast concrete members are arranged vertically side by side, making assembly construction difficult. The problem is that it is complicated.

The purpose of this invention is to provide a composite sidewall structure for a concrete container that has strong sidewall strength and allows for easy and quick assembly of precast concrete members.

[Means for Solving the Problems] In order to achieve the above object, the synthetic side wall structure of a concrete container of this invention includes a plurality of ribbed plates that are integrated into the upper and lower sides and have a plurality of vertical ribs 1 on the outside. Cast concrete members 2 are arranged side by side in the circumferential direction of the container to constitute an outer peripheral wall 3, and vertical PC steel members 5 are arranged within the vertical ribs 1 of the ribbed precast concrete member 2 to constitute the outer peripheral wall 3. A plurality of dowel bars 6 are provided protruding inside the ribbed precast concrete member 2, and cast-in-place concrete is placed inside the outer peripheral wall 3 to form an inner peripheral wall 4.

[Example] Next, this invention will be explained in detail using illustrated examples.

Figures 4 to 6 show an outer circumferential wall forming unit 8 used in an embodiment of the invention, in which the width of the plate 9 extends continuously in the vertical direction over the entire height of the container circumferential wall. on both sides of the direction,
Reinforcing vertical ribs 1 protruding outward from the plate 9 are integrally connected, and a lower flange 10 is integrally connected to the lower end of each vertical rib 1 and the lower end of the plate 9.
A ribbed precast concrete member 2 is constructed by providing a recess 11 and a plurality of vertical holes 12 for insertion of anchor bolts, and a plurality of vertical holes extending in the longitudinal direction of each vertical rib 1. Along with the PC steel material 5 being placed, distribution reinforcing bars (not shown) are buried in the plate 9, and a large number of U-shaped dowel bars 6 are arranged inside the plate 9 in the vertical direction and the width of the plate. The dowel bars 6 are arranged at intervals in the direction and are welded or tied to the distribution reinforcing bars, and each dowel bar 6 protrudes from the inner surface of the plate body 9.

The vertical PC steel material 5 is tensioned in advance, and after the curing period of the concrete in the ribbed precast concrete member 2 has elapsed, the tension in the vertical direction PC steel material 5 is released and the ribbed precast concrete member 2 is precast. A rubber sealing material 13 extending in the vertical direction is fixed to one side of the ribbed precast concrete member 2 with an adhesive or the like.
The outer circumferential wall forming unit 8 thus configured is manufactured at a factory.

When constructing a concrete container having a composite peripheral wall of this invention using the outer peripheral wall forming unit 8, first, as shown in FIGS. After excavation, concrete foundation slab 14 and concrete bottom slab 15 are constructed in sequence, and the bottom slab 1
An annular groove 16 is previously provided in the peripheral wall joint portion 5, and lower portions of anchor bolts 17 and 26 are embedded and fixed in the bottom of the annular groove 16.

Next, the outer peripheral wall component unit 8 is transported to the construction site and erected in a predetermined position using a crane, and the nuts 20 are screwed onto the upper portions of the anchor bolts 17 inserted into the lower flange 10 of the ribbed precast concrete member 2. At the same time, the nut 20 is tightened to connect the lower end of the ribbed precast concrete member 2 to the bottom plate 15. In addition, an annular prefabricated scaffold 18 equipped with multiple stages of scaffolding boards 25 arranged at intervals in the vertical direction is assembled and installed on the bottom slab 15 inside the peripheral wall construction position in advance, and the prefabricated scaffolding is installed as necessary. 18 and the upper end of the outer circumferential wall forming unit 8 are connected by a connecting member (not shown) to support the outer circumferential wall forming unit 8 so that it does not fall down.

By repeating the above-mentioned operations, and by arranging the connecting reinforcing bars 21 across the dowel bars 6 of adjacent outer peripheral wall constituent units 8 and connecting them by welding, the outer peripheral wall 3 consisting of a large number of outer peripheral wall constituent units 8 is assembled. Assemble and configure.

Next, on the inside of the outer circumferential wall 3, there is a circumferential direction for the inner circumferential wall.
The PC steel material 7 and the reinforcing bars 22 are arranged, and as shown in FIG. Next, the cylindrical inner formwork 23 is erected, and the inner formwork 23 is fixed by the formwork fastener 29 screwed onto the other end of the formwork spacing holder 28, and the formwork is tightened. The fixture 29 and the prefabricated scaffold 18 are connected via a connecting rod 19.

Next, cast-in-place concrete is placed between the inner formwork 23 and the outer circumferential wall 3 to form an inner circumferential wall 4 having a plurality of pilasters 24 inside, and the inner circumferential wall 4 and the outer circumferential wall 3 Compose a composite peripheral wall.

After the concrete reaches a predetermined strength,
A jack is placed on the side surface of the pilaster 24, and the jack tensions the circumferential direction PC steel material 7,
The end of the PC steel material 7 in the circumferential direction is
5, it is fixed on the pilaster 24.

When the circumferential prestressing steel material 7 is inserted into the sheath, after the circumferential prestressing steel material 7 is fixed under tension, mortar grout is injected between the circumferential prestressing steel material 7 and the sheath.

Finally, after removing the prefabricated scaffolding 18 and the inner formwork 23, the lower flange of the inner peripheral wall 4 is tightened with a nut screwed onto the upper part of the anchor bolt 27, thereby completing a concrete container having a composite peripheral wall.

The outer circumferential wall 3 made of a large number of ribbed precast concrete members 2 and the inner circumferential wall 4 made of cast-in-place concrete in the circumferential wall are integrated via a large number of dowel reinforcements 6, so that the stress acting on the circumferential wall is The outer circumferential wall 3 and the inner circumferential wall 4 act as an integral structure to resist this.

Further, the vertical stress acting on the peripheral wall is mainly resisted by prestress obtained by tensioning the vertical PC steel material 5 disposed within the vertical rib 1 of the ribbed precast concrete member 2. Furthermore, the stress in the horizontal direction is mainly resisted by the press stress obtained by tensioning the circumferential prestressing steel members 7 placed in the cast-in-place concrete.

As in the above embodiment, if the vertical PC steel material 5 is arranged within the vertical rib 1 extending in the vertical direction in the ribbed precast concrete member 2, the amount of eccentricity of the vertical PC steel material 5 from the neutral axis is increased. Therefore, the amount of vertical prestressing steel material used can be reduced.

When implementing this invention, the vertical prestressing steel material 5 may be inserted into the sheath in advance, or a known unbonded steel rod or unbonded cable without a sheath may be used as the vertical prestressing steel material 5. good. As shown in FIG. 9, the pilasters 24 may also be provided so as to protrude outward from between adjacent ribbed precast concrete members 2.

[Effect of the invention] This invention is structured as described above, so
This produces the effects described below.

Since the vertical pre-cast steel material 5 is disposed within the vertical ribs 1 of the ribbed precast concrete member 2, which is integrally formed with the upper and lower parts and has a plurality of vertical ribs 1 on the outside, The cast concrete member 2 can be significantly strengthened, and since the precast concrete member 2 constituting the outer peripheral wall 3 is continuous over the entire length of the outer peripheral wall 3, the precast concrete member 2 constituting the outer peripheral wall 3 can be easily and quickly assembled, and furthermore, a plurality of dowel reinforcements 6 are protruded from the inside of the precast concrete member 2 constituting the outer peripheral wall 3, and the dowel reinforcements 6 are connected to the outer peripheral wall 3. Since it is embedded and fixed in the inner circumferential wall 4 made of cast-in-place concrete cast inside the precast concrete member 2, the outer circumferential wall 3 made of the precast concrete member 2 and the inner circumferential wall 4 made of cast-in-place concrete are firmly integrated. , a high-strength composite sidewall can be constructed.

[Brief explanation of the drawing]

Figures 1 to 8 show one embodiment of this invention, in which Figure 1 is a longitudinal cross-sectional side view of a concrete container with a composite peripheral wall, and Figure 2 is a cross-section at the level of the dowel bars in the composite peripheral wall. Figure 3 is a cross-sectional view of the level of the circumferential prestressing steel material in the composite peripheral wall, Figure 4 is a partially cutaway front view of the outer peripheral wall constituent unit used in the embodiment of this invention, and Figure 5
The figure is a partially cutaway side view, Figure 6 is a sectional view taken along the line A-A in Figure 4, Figure 7 is a partially cutaway vertical side view showing the state in which the composite peripheral wall is being constructed, and Figure 8 is a side view of the composite wall being constructed. FIG. 7 is an enlarged longitudinal cross-sectional side view of a part of FIG. 7; FIG. 9 is a cross-sectional plan view showing an example in which pilasters are provided on the outside. In the figure, 1 is a vertical rib, 2 is a ribbed precast concrete member, 3 is an outer peripheral wall, 4 is an inner peripheral wall, 5 is a vertical PC steel material, 6 is a dowel reinforcement,
7 is a circumferential PC steel material, 8 is an outer peripheral wall constituent unit, 6 is a plate, 10 is a lower flange, 14 is a foundation plate, 15 is a bottom plate, 16 is an annular groove, 17 is an anchor bolt, 18 is a prefabricated scaffold, 19 is a connecting member, 2
1 is a connecting reinforcing bar, 22 is a reinforcing bar, 23 is an inner formwork, 2
4 is a pilaster.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of ribbed precast concrete members 2 of an integrated upper and lower structure each having a plurality of vertical ribs 1 on the outside are arranged side by side in the circumferential direction of the container to form an outer peripheral wall 3. A vertical PC steel material 5 is arranged within the vertical rib 1 of the ribbed precast concrete member 2, and the outer peripheral wall 3
A plurality of dowel reinforcements 6 are provided protruding inside the ribbed precast concrete member 2 constituting the
A composite side wall structure for a concrete container, characterized in that the inner peripheral wall 4 is constructed by pouring cast-in-place concrete inside the outer peripheral wall 3. (2) Utility model registration claim 1, characterized in that a plurality of circumferential prestressing steel members 7 extending in the circumferential direction of the inner circumferential wall are arranged in the cast-in-place concrete constituting the inner circumferential wall 4. Composite side wall structure of concrete container.