JPH0549786B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention utilizes a steel sheet pile wall for earth retaining to support the inner formwork and outer edge cut plate for constructing an underground concrete structure, and The present invention relates to a formwork construction method for concrete structures using steel sheet pile walls for earth retaining, from which all the steel sheet piles can be pulled out after the structure is constructed.

[Prior art]

Generally, when constructing a concrete structure such as a pit underground, in order to prevent the ground from collapsing when the construction site is excavated, the construction schedule of the concrete structure 9 is set as shown in Fig. 20. A steel sheet pile wall 1 for earth retention is installed by driving a large number of steel sheet piles 8 into the ground 10 at positions surrounding a place using a vibrating driving device 11.

When building a concrete structure, there are two methods depending on the surrounding situation:

(1) As shown in FIGS. 21 and 22, in order to secure a space 13 for installing the outer formwork scaffolding 12, the location is a distance of the space 13 from the planned construction location of the concrete structure 9. A steel sheet pile 8 is placed in the concrete structure 9.
After constructing the steel sheet pile 8, the steel sheet pile 8 is pulled out.

(2) As shown in Figures 23 and 24, if space cannot be secured to install scaffolding for outer formwork assembly, the steel sheet piles 8 can be attached to the concrete structure 9.
A steel sheet pile wall 1 for earth retaining consisting of a large number of steel sheet piles 8 is also used as the outer formwork, and one end of the separator 4 is directly fixed to the steel sheet pile wall 1. An inner formwork 6 is supported by the other end of the separator 4, and then concrete is poured between the steel sheet pile wall 1 and the inner formwork 6 to construct a concrete structure 9. Since the steel sheet pile 8 is fixed to the separator 4, the steel sheet pile 8 is buried without being pulled out.

However, in the case of method (1) above, it is necessary to provide a relatively wide space 13 between the planned concrete structure construction location and the steel sheet pile wall 1.
As the scope of construction becomes wider, the number of steel sheet piles 8 used increases, and the amount of earthwork such as excavation of earth and sand in the area surrounded by the steel sheet pile wall increases, resulting in higher construction costs and longer construction times. be.

In addition, in the case of method (2) above, even after constructing the concrete structure 9, the steel sheet piles 8 are fixed to the separators 4 in the concrete structure and cannot be removed, and all the steel sheet piles are buried. Because you will be killed
There is a problem in that construction costs are significantly higher.

[Purpose and structure of the invention]

The purpose of this invention is to provide a formwork construction method for concrete structures using steel sheet pile walls for earth retaining, which can advantageously solve the above-mentioned problems, and the gist of this invention is to: Steel sheet pile wall 1 placed to surround the concrete structure construction site
After excavating and removing the earth and sand inside, the lower end of the separator support member 3 placed in the recess 2 inside the steel sheet pile wall 1 is temporarily fixed near the lower part of the steel sheet pile wall 1 so that the separator support member 3 can be pulled out. The upper end of the separator support member 3 is temporarily fixed to the steel sheet pile wall 1.
The separator 4 supported by the steel sheet pile wall 1
The separator 4 maintains the distance between the edge cutting plate 5 and the inner formwork 6, and then the edge cutting plate 5 and the inner formwork A steel sheet pile wall for earth retaining, characterized in that after the concrete 7 poured during the period 6 has hardened, the separator support member 3 is dismantled and removed, and the steel sheet pile 8 constituting the steel sheet pile wall 1 is pulled out. A formwork construction method for concrete structures using

〔Example〕

Next, the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 to 7.

First, as shown in FIGS. 1 to 5, a steel sheet pile wall 1 consisting of a large number of steel sheet piles 8 is poured into the ground 10 in close proximity to the planned construction location of the concrete structure, and then the steel sheet pile wall 1 Ground 10 surrounded by
excavate, level concrete on the excavated ground surface, and assemble base reinforcing bars on top of it.

Next, in the recess 2 inside the steel sheet pile wall 1, a pair of separator support members 3 with a groove-shaped cross section extending in the vertical direction are arranged at a small interval in the longitudinal direction of the steel sheet pile wall, and each separator support member 3 The lower end of the inverted U-shaped hanging metal fitting 1 is inserted into the fixing cylinder 14 embedded in the pre-cast base concrete 21.
5 and a female threaded metal fitting 16 fixed thereto by welding.
and a screw rod 17 screwed into the female screw fitting 16, and a plurality of nuts 18, 19 screwed into the screw rod 17.
The screw rod 17 of the temporary fastener 20 is inserted into the upper end of the separator support member 3, and the latch 15 of the temporary fastener 20 is fitted to the upper end of the steel sheet pile wall 1, and each of the nuts 18 , 19 to temporarily fix the upper end of the separator support member 3 to the steel sheet pile wall 1.

Separator holder 2 also includes a band-shaped separator holder plate 22 and a plurality of separator outer screw rods 23 whose one ends are fixed to the separator holder plate 22 by welding.
4 are inserted between the pair of separator support members 3, the separator holding plate 22 is arranged so as to engage with the outside of the pair of separator support members 3, and A spacer 44 such as a wooden wedge is interposed between them.

Next, as shown in FIGS. 6 and 7, an adjustment receiving piece 25 such as a screw washer or a nut is screwed onto the outer screw rod 23, and a backing plate 26 is fitted, and then a flat edge cutting plate is fitted. The outer screw rod 23 is inserted into the through hole provided in the outer screw rod 5, the edge cutting plate 5 is brought into contact with the inner surface of the steel sheet pile wall 1, and the retainer plate 27 fitted into the outer screw rod 23 is inserted into the inner surface of the edge cutting plate 5. At the same time as coming into contact with
A fastener 28 such as a screw washer or a nut is screwed onto the outer screw rod 23, and the adjustment receiving piece 25 and the fastener 2 are screwed together.
8 holds the edge cutting plate 5 in place via the backing plate 26 and the holding plate 27.

Next, the inner end portion of the inner screw rod 29 for separator is fixed to the outer end portion of the outer screw rod 23 by welding, adhesive, or other means, and the inner screw rod 29
A water stop material 30 such as a rubber plate or a steel plate is penetrated through the intermediate portion of the molding member 30 to be watertightly attached, and a formwork receiving piece 43 is fixed or hooked to the inner end side of the inner screw rod 29.

Next, after assembling and installing wall reinforcing bars inside the edge cutting board 5, the inner formwork 6 is placed inside the wall reinforcing bars.
Insert the inner screw rod 29 into the through hole, engage the inner formwork 6 with the formwork receiving piece 43, and arrange the vertical beams 31 and horizontal beams 32 on the front side of the inner formwork 6, Furthermore, the presser washer 33 is fitted into the inner protrusion of the inner screw rod 29, and the nut 34 is screwed on to complete the assembly and installation work of the formwork.

The outer screw rod 23, the inner screw rod 29, and the adjustment receiving piece 2
5. While maintaining a constant distance between the edge cutting plate 5 and the inner formwork 6 by the separator 4 consisting of the fastener 28 and the formwork receiving piece 43, etc., the edge cutting plate 5 and the inner formwork 6 are
After pouring the concrete 7 that constitutes the structure between the two and curing the concrete 7, the inner formwork 6, the vertical beams 31, the horizontal beams 32, and the presser washers 3 are placed.
3. Remove the nut 34, etc., and then remove the inner screw rod 29.
, remove the temporary fasteners 20, release the connection between the steel sheet pile wall 1 and the separator support member 3, pull out and collect the separator support members 3 one by one, and finally remove the steel sheet piles 8. It is pulled out and collected using a vibrating pulling device. In addition, Figures 3 and 7
In the figure, 45 is a concrete adhesion prevention plate to the steel sheet pile.

8 and 9 show other examples of the temporary fixing structure for the lower end of the separator support member, in which the lower portions of a pair of temporary fixing members 35 are embedded and fixed in the base concrete 21, and have a groove-shaped cross section. The lower end of the separator support member 3 is placed on the base concrete 21 and is engaged with a temporary fixing member 35 .

FIGS. 10 to 13 show other examples of the temporary fixing structure of the upper end of the separator support member,
In the case of FIGS. 10 and 11, the chain 36
An inverted U-shaped latch 15 is connected to both ends of the temporary fastener 20, and the chain 36 is wrapped around a pair of separator support members 3, and
Each latching fitting 15 is fitted and latched to the upper edge of the steel sheet pile wall 1.

In the case of FIGS. 12 and 13, a fitting recess 38 that fits into the webs of the pair of separator support members 3 in the steel plate 37 and a fitting recess 39 that fits on both sides of the recess 2 of the steel sheet pile wall 1 are provided to constitute a temporary fastener 20, and fitting recesses 38 and 39 in the temporary fastener 20 are fitted into the web of the separator support member 3 and the upper edge of the steel sheet pile wall 1.

14 to 17 show the separator holder 24
In the case of FIGS. 14 and 15, the separator outer screw rod 23 is inserted into the separator holding plate 22 and is screwed to the outer screw rod 23 on both sides of the separator holding plate 22. The outer screw rod 23 is fixed to the separator holding plate 22 by fixing nuts 40 and 41.

In the case of FIGS. 16 and 17, a female threaded tube 42 is fixed to the separator holding plate 22 by welding, and an outer threaded rod 23 is screwed into the female threaded tube 42.

When carrying out this invention, the separator support member 3 may have an L-shaped cross section as shown in FIG. 18, or a circular cross section as shown in FIG. good. Moreover, as the separator 4, one having an arbitrary structure other than that shown in the drawings may be used.

As the edge cutting plate 5, the backing plate 26, and the holding plate 27, for example, wood plywood, steel plate, or plastic plate is used. The material of the separator support member 3 and the inner formwork 6 may be, for example, steel, wood, or plastic.

〔Effect of the invention〕

According to this invention, the lower end of the separator support member 3 placed in the recess 2 inside the steel sheet pile wall 1 after excavating and removing the earth and sand in the steel sheet pile wall 1 that has been cast so as to surround the concrete structure construction site. The upper end of the separator support member 3 is temporarily fixed to the steel sheet pile wall 1 near the lower part of the steel sheet pile wall 1, and the separator 4 supported by the separator support member 3 is attached to the steel sheet pile wall. 1, the separator 4 maintains the distance between the edge cutting plate 5 and the inner mold 6, and then the edge cutting plate 5 and the inner mold Since the concrete 7 constituting the underground structure is placed between the frames 6, the concrete 7 can be placed close to the steel sheet pile wall 1 and can be placed without adhering to the steel sheet pile wall 1, and After the concrete 7 hardens, the separator support member 3 and the steel sheet piles 8 forming the steel sheet pile wall 1 are pulled out and recovered, so a large space is created between the steel sheet pile wall 1 and the concrete structure 9. After constructing the concrete structure, the steel sheet piles 8 and separator support members 3 that make up the steel sheet pile wall 1 can be recovered, reducing the construction scope and reducing the amount of earthwork.
The number of steel sheet piles used can be reduced, and a concrete structure can be constructed in a short construction period and at low construction costs.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, in which FIG. 1 is a perspective view showing a state in which a separator support member and an outer screw rod are installed inside a steel sheet pile wall, and FIG. 2 is a perspective view thereof. A plan view, FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 2, FIG. 4 is an enlarged plan view showing the vicinity of the upper end temporary fixing part of the separator support member, and FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4. 6 is a plan view showing the assembled formwork device, and FIG. 7 is a sectional view taken along the line CC in FIG. 6. FIG. 8 is a front view showing another example of the lower end temporary fixing structure of the separator support member, FIG. 9 is a sectional view taken along the line D-D in FIG. 8, and FIG. 10 is another example of the upper end temporary fixing structure of the separator support member. A perspective view showing an example of
FIG. 11 is a plan view thereof, and FIG. 12 is a perspective view showing another example of the upper end temporary fixing structure of the separator support member.
Fig. 13 is a longitudinal sectional front view thereof, Fig. 14 is a perspective view showing another example of the separator holder, Fig. 15 is a partially longitudinal side view thereof, and Fig. 16 is a perspective view showing another example of the separator holder. 17 is a partially longitudinal side view thereof, and FIGS. 18 and 19 are perspective views showing other examples of the separator support member. Fig. 20 is a schematic perspective view showing the steel sheet pile driving situation when implementing the conventional concrete structure construction method, Fig. 21 is a schematic vertical side view showing an example of the conventional concrete structure construction method, and Fig. 22 23 is a schematic longitudinal side view showing another example of the conventional concrete structure construction method, and FIG. 24 is a plan view showing the relationship between the steel sheet pile wall and the concrete structure in this construction method. FIG. 2 is a plan view showing a constructed concrete structure and a steel sheet pile wall. In the figure, 1 is a steel sheet pile wall, 2 is a recess, 3 is a separator support member, 4 is a separator, 5 is an edge cutting board, 6 is an inner formwork, 7 is concrete, 8 is a steel sheet pile, and 14 is a fixing tube. 15 is a latch fitting, 20 is a temporary fastener, 21 is a base concrete, 22 is a separator holding plate, 23 is an outer screw rod for separator, 2
4 is a separator holder, 25 is an adjustment receiving piece, 28 is a fastener, 29 is an inner screw rod for separator, 31 is a vertical flap member, 32 is a horizontal flap member, 33 is a presser washer, 34
is a nut, and 43 is a formwork support piece.

Claims (1)

[Claims] 1 After excavating and removing the earth and sand within the steel sheet pile wall 1 that was placed to surround the concrete structure construction site,
The lower end of the separator support member 3 placed in the recess 2 inside the steel sheet pile wall 1 is temporarily fixed near the lower part of the steel sheet pile wall 1 so that it can be pulled out, and the upper end of the separator support member 3 is attached to the steel sheet pile wall 1. The separator 4, which is temporarily fixed and supported by the separator support member 3, is inserted through the edge cutting plate 5 and the inner formwork 6 that are in contact with the inner surface of the steel sheet pile wall 1, and the separator 4 allows the edge cutting plate 5 and After maintaining the interval between the inner formworks 6 and then hardening the concrete 7 placed between the edge cutting board 5 and the inner formwork 6, the separator support member 3 is dismantled and removed to form the steel sheet pile wall 1. This is a formwork construction method for a concrete structure using a steel sheet pile wall for earth retaining, which is characterized by pulling out the steel sheet pile 8.