JP2000160530A - Prefabricated bank body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prefabricated bank body easy in assembling and execution work by prefabricating a constitutive member as much as possible. SOLUTION: A pair of columns 20, 20 are detachably erected on a bottom plate 10, and upper end parts of the respective columns 20 and the bottom plate 10 are detachably connected by a buttress frame 30 to be installed on a footing mound D. First vertical grooves 23a, 23a and second vertical grooves 23b, 23b are oppositely arranged on the inside surface of a pair of columns 20, 20, and arch-shaped earth retaining segments 40 and wave extinguishing plates 50 are fitted in the respective grooves. Backfilling stones S are filled in a back face of an arch-shaped earth retaining wall formed of plural earth retaining segments 40, and an upper floorboard 60 is arranged on the top surface of the columns 20, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a levee such as a quay or a seawall, and more particularly to a completely prefabricated levee.

[0002]

2. Description of the Related Art For example, when constructing a quay by the caisson method, a caisson, which is a large structure manufactured in a factory, is towed to a work site and installed in the ocean with a crane. Not only is the work required to be carried out, and the transportation work becomes large, but also the prefabrication of only the structure body is required, and a large number of site construction parts still remain.

[0003]

Therefore, for example, in Japanese Patent Application Laid-Open No. Hei 8-81933, large and small cell shells are assembled in advance by using a steel sheet pile or a curved plate at an assembly base, and the cell shells are concentrically driven into a submarine ground by a pile driving machine. After that, the filling material is put in each large and small cell shell, and the pre-assembled arc is also bridged between the adjacent large cell shells, and the filling material is put in this arc, and the prefabricated building seawall etc. A cell method is disclosed.

However, this method requires a lot of trouble in assembling and driving a cell shell, and steel sheet piles and curved plates corrode in an environment exposed to seawater and waves.
There is also a problem with durability.

Accordingly, an object of the present invention is to shorten the construction period by making prefabricated members such as quays as much as possible, facilitating assembly and construction, and minimizing construction of a levee body at a site exposed to wind waves at sea. And to ensure that the entire embankment has sufficient durability without being affected by the natural conditions at the site.

Another object of the present invention is to provide a wave canceling function for reducing a reflected wave.

[0007]

In order to solve the above-mentioned problems, a prefabricated embankment of the present invention includes a square bottom plate, a pair of columns and a buttress frame, a plurality of substantially arched retaining segments, and a substantially L-shaped. It consists of an upper floor slab, and each of the columns is detachably erected on both sides of the front end of the bottom slab, and each buttress frame detachably connects the upper end of each column and both sides of the rear end of the bottom slab. Both ends of each retaining segment can be fitted into vertical grooves provided inside the pair of struts so as to face each other, and the upper floor slab can be installed on the top surfaces of the pair of struts.

A second vertical groove is provided on the inner surfaces of the pair of columns so as to face each other, and a plurality of wave canceling plates can be fitted into the vertical grooves at intervals. Further, in the upper floor slab, an opening is provided in a range corresponding to the arch portion of the retaining segment, and if the retaining wall can be erected behind the opening, wave conditions are more severe than the quay. It is useful when applied as a revetment.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, each member constituting the prefabricated embankment will be described. The embankment of the present invention comprises a bottom plate of FIGS. 1 and 2, a support of FIGS. 3 and 4, a buttress frame of FIG. 5, a retaining segment of FIG. 6, a wave-breaking plate of FIG. Each member is made of concrete, reinforced concrete, or prestressed concrete, but some members may be made of a water-resistant synthetic resin.

As shown in FIGS. 1 and 2, the bottom plate 10 is
It is a substantially flat rectangular plate-like body, on its surface, parallel ridges 11, 11 are provided in the length direction, and the tip of each ridge 11 has a mounting portion 11a of a pillar, a rear end. Is provided with a buttress frame mounting portion 11b. A plurality of connecting PC steel bars are buried in these mounting portions 11a and 11b in an appropriate arrangement, and male threads are formed at the ends of the PC steel bars so that the couplers can be connected. This will be described later. Further, a semi-circular support base 12 for supporting the retaining segment is provided to extend over the distal end mounting portions 11a of the protrusions 11, 11.

As shown in FIG. 3 and FIG.
The mounting base 21 and the front wall 2 which stands upright from the mounting base 21 integrally.
2 and a support column 23. The mounting base 21 is detachably joined to the mounting portion 11 a of the bottom plate 10, and has a front wall 22.
And a support column 23 that supports the support column 23 at right angles to the bottom plate 10. The front wall 22 is a wall surface facing the ocean, and the support column 23 is provided with a first vertical groove 23a for sequentially inserting the retaining segments and a second vertical groove 23b for inserting the wave-breaking plate. . The first vertical groove 23a extends over the entire vertical length of the support column 23, and the second vertical groove 23b
Ends at a stop surface 23c in the middle of the support column 23. A buttress frame mounting portion 24 is provided on the rear surface of the upper end portion of the support column 23. In the drawing, reference numeral 21a denotes the mounting base 21 for the mounting portion 11a of the bottom plate 10.
PC steel rod insertion hole for joining to

FIG. 5 shows the buttress frame 30. As shown in the drawing, at one end of a substantially quadrangular prism-shaped main body 31, there is provided a mounting portion 32 which is detachably joined to the mounting portion 11 b of the bottom plate 10. A mounting portion 33 is provided that is capable of being joined. The joint surfaces of these mounting portions 32 and 33 are configured to abut exactly on the other mounting portions 11b and 24.

FIG. 6 shows a retaining segment 40. As shown in the figure, at both ends of the semicircular arch portion 41, engagement portions 42, 4 fitted in the first vertical groove 23a of the support column 20 are provided.
2 are provided. And this retaining segment 4
0 becomes a retaining wall by sequentially fitting a plurality of, for example, eight pieces into the vertical groove 23a.

FIG. 7 shows a substantially U-shaped wave-breaking plate 50. As shown in the drawing, the legs 52 at both ends of the bar 51 are spacers, and are fitted into the second vertical groove 23b of the support column 20 with the legs 52 facing up, so that the bar 51 fitted earlier is There is a space between them. A plurality of the wave canceling plates 50 are fitted into the vertical groove 23b so as to have an opening ratio that maximizes the wave canceling effect on the dominant wave at the installation position. Note that the wave canceling plate 50 may have a comb shape depending on the opening ratio.
Further, it may be simply a bar shape, and in this case,
When fitting into the vertical groove 23b, a space can be provided by using a separate spacer.

FIG. 8 shows an upper floor slab 60 installed at the upper end of the column 10 protruding from the sea surface. As shown, the upper slab 6
Reference numeral 0 denotes a plate-like body whose side surface is substantially L-shaped,
1, a fender 62 and the like are provided in advance at a factory. Preferably, a pair of locking projections 65 are provided on the lower surface of the upper floor slab 60. This function will be described later.

Next, a method for assembling the above members will be described. This assembly is performed at a work base for constructing a quay or the like. First, the mounting portion 11 of the bottom plate 10
A coupler is connected to a PC steel bar embedded in a, and a pair of columns 20 is erected thereon as shown in FIG. At this time, the mounting base 21 of each support 20 is attached to the mounting portion 1 of the bottom plate 10.
1a, and the longitudinal grooves 23a, 23b of one of the columns 20
Is installed so as to face the vertical grooves 23a and 23b of the other support 20. Then, as shown in FIG. 10, insert the PC steel rod A ₁ into the insertion hole 21a of the mount 21, screw connection to previously buried PC steel rod B coupler C ₁ coupled to _1,
Fastening a nut at the tip of the PC steel rod A _1. The upper part of the nut is filled with a material that blocks seawater intrusion and can be easily removed for rust prevention. Also, the mounting portion 11
coating the non-shrinkage mortar M ₁ at the interface between the a and the mounting base 21, preferably kept so as to increase the tightening effect of the PC steel bars.

The columns 20, 20 erected as described above.
The buttress frames 30, 30 are mounted between the base plate 10 and the bottom plate 10 as shown in FIG. The structure of the joint is as shown in FIGS. 12 and 13, and is substantially the same as the joint of FIG. In the drawing, reference numerals A ₂ , A ₃ , B ₂ , and B ₃ are PC steel bars, C ₂ and C ₃ are couplers, and M ₂ and M ₃ are non-shrink mortars.

The assembly of the bottom plate 10, the pillars 20, 20, and the buttress frames 30, 30 is towed to a construction site such as a quay, and as shown in FIG. The tops of the columns 20 protrude from the water surface WL, and the assemblies are arranged so that they touch each other. At this stage, since the earth retaining segment 40 is not fitted, the influence of the waves is small and there is no danger of falling, and the stability of the assembly installed in the sea is ensured. Therefore, the installation of the assembly shown in FIG. Only the construction can proceed at a stretch. Unlike the caisson or the steel cell structure, it is not necessary to fill the filling sand early after the installation, and the fitting of the retaining segment 40 can be performed with a margin under the prediction of weather conditions. After that, the retaining segments 40 are sequentially fitted into the longitudinal grooves 23a, 23a of the opposing column 20. At this time, the retaining segments 40 are not piled up to the top of the column 20 at a stroke, but are initially retained in a low position (2 to 3 steps), and the backing stones S are supplied. It is preferred that the retaining segment 40 is gradually fitted to a high position. This is because if the retaining segment 40 is fitted to a high position without sufficient backing of the backing stone S, there is a risk that the levee body assembly may be damaged by the impact of the waves.

After stacking the earth retaining segments 40 to the uppermost step, the wave-breaking plate 50 is fitted into the opposed vertical grooves 23b, 23b. Then, the upper part of the front wall 22 is covered with the upper floor slab 60 from the top surface of the column 20. At this time, the locking projections 65 provided on the lower surface of the upper floor slab 60 are engaged with the outer surfaces of the columns 23 of the columns 20, thereby preventing the upper floor slab 60 from moving. On the other hand, the sand-proofing sheet E is covered from the deposition slope of the backing stone S to the end face of the upper floor slab 60, and the land side is buried with the landfill F therefrom. Further, an apron pavement G is formed on the upper surface.

FIGS. 15 and 16 show an example in which the embankment assembly is used for revetment. As shown, the upper floor slab 60
The skirt 61 is shorter than that of the quay, and an opening 63 is provided in the floor
4 is fitted. The opening 63 is provided within a range corresponding to the arched retaining wall formed by the retaining segment 40, and behind the opening 63, a top retaining wall 70 removably fixed to the upper floor slab 60. Is arranged. The backside of the retaining wall 70 is landfill F.

FIG. 17 shows another embodiment of the bank body. As shown in the drawing, prisms 13 having appropriate heights are respectively provided integrally with the bottom plate 10 outside the column mounting portions 11a provided on the bottom plate 10, and the columns 20 and the buttress frame 30 are provided.
Is attached to the base mound D (see FIG. 14), and the square block-shaped weight block 80 is dropped between the prism 13 and the column 20, so that the adjacent bottom plates 10, 10, To prevent misalignment.

The embankment body of the present invention may further include a breakwater,
It can be used for wave breakwater, extension of San Bridge, etc. It can also be reused after disassembly and removal.

[0023]

According to the present invention, as described above, each part constituting the L-shaped retaining wall can be rationally divided into individual members, produced at a factory, and easily assembled at a construction base such as a quay. Therefore, strict quality control contributes to achieving high quality, shortening the construction period, and reducing costs.

Further, since the retaining wall is divided into a plurality of segments and is fitted into the vertical groove, not only the fitting operation is facilitated, but also the retaining wall is formed in synchronization with the operation of inserting the backing stone. Therefore, damage due to waves can be prevented.

Further, since the retaining segment is formed in an arch shape and the wave-breaking plate is arranged on the front surface thereof, an effective wave-breaking function is exhibited.

In addition, there are various advantages such that the embankment body can be disassembled and removed after construction, and can be reused.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bottom plate of a bank body.

FIG. 2 is a plan view of the above.

FIG. 3 is a perspective view of a column.

FIG. 4 is a plan view of the above.

FIG. 5 is a perspective view of a buttress frame.

FIG. 6 is a perspective view of a retaining segment.

FIG. 7 is a perspective view of a wave breaking plate.

FIG. 8 is a perspective view of the upper floor slab.

FIG. 9 is a perspective view showing a state in which a support is erected on the bottom plate.

FIG. 10 is a partially enlarged cross-sectional view showing a joint between a bottom plate and a support.

FIG. 11 is a perspective view showing an assembly of a bottom plate, a support, and a buttress frame.

FIG. 12 is a cross-sectional view showing a joint between a support and a buttress frame.

FIG. 13 is a sectional view showing a joint between the buttress frame and the bottom plate.

FIG. 14 is a perspective view showing the structure of a quay.

FIG. 15 is a sectional view showing the structure of a revetment.

FIG. 16 is a partial plan view of the upper surface of the revetment.

FIG. 17 is a partially cross-sectional plan view showing another embodiment of the embankment body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Bottom plate 11 Protrusion 11a, 11b Attachment part 12 Support stand 13 Square pillar 20 Support 21 Attachment base 21a Insertion hole 22 Front wall 23 Support column 23a First vertical groove 23b Second vertical groove 23c Stop surface 24 Mounting part 30 Buttress frame 31 Quadrangular prism-shaped main body 32, 33 Mounting part 40 Earth retaining segment 41 Arch part 42 Engaging part 50 Wave-absorbing plate 51 Bar 52 Leg 60 Upper floor slab 61 Skirt part 62 Fender 63 Opening 64 Grating 65 Locking protrusion 70 Soil fastening wave flashing wall 80 weight blocks _{A 1, A 2, A 3} PC steel bars _{B 1, B 2, B 3} PC steel rod C _1, C _2, C ₃ coupler D foundation mound E Bosa sheet F landfill soil G paving S Backing stone W / L Water surface

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[Procedure amendment]

[Submission date] December 21, 1999 (1999.12.
21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

In order to solve the above-mentioned problems, a prefabricated embankment body of the present invention is attached to both sides of the tip of a square bottom plate.
A pair of columns that are detachably erected and upper ends of the columns.
Frame that detachably connects the rear end of the bottom plate
And assembly formed from, made Ri by a plurality of substantially arcuate earth retaining segment, both end portions of the front Symbol each earth retaining segment was fittable to the longitudinal groove disposed opposite the inner side of the pair of posts It is.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

A second vertical groove is provided on the inner surfaces of the pair of columns so as to face each other, and a plurality of wave canceling plates can be fitted into the vertical grooves at intervals .

Claims (3)

[Claims] 1. A bottom plate, a pair of struts and a buttress frame, a plurality of substantially arched retaining segments, and a substantially L-shaped upper floor plate. Each of the struts is detachable on both sides of the tip of the bottom plate. Each buttress frame is detachably connected to the upper end of each strut and both sides of the rear end of the bottom plate, and both ends of each earth retaining segment are provided to face the inside of a pair of struts. It can be fitted into a vertical groove,
The upper floor slab is a prefabricated embankment that can be installed on the top surfaces of a pair of columns. 2. The prefabricated structure according to claim 1, wherein a second vertical groove is provided on the inner surfaces of said pair of columns so as to face each other, and a plurality of wave-breaking plates can be fitted in said vertical grooves at intervals. Embankment. 3. The method according to claim 1, wherein an opening is provided in the upper floor slab within a range corresponding to the arch portion of the earth retaining segment, and an earth retaining wavy wall can be erected behind the opening. Prefabricated embankment as described.