JPH0549787B2 - - 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 11 is set as shown in Fig. 12. A steel sheet pile wall 1 for earth retention is installed by driving a large number of steel sheet piles 10 into the ground 12 at positions surrounding the site using a vibrating driving device 13.

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

(1) As shown in Fig. 13 and Fig. 14, in order to secure a space 15 for installing the outer formwork scaffold 14, a position separated by the distance of the space 15 from the planned construction position of the concrete structure 11. After driving the steel sheet piles 10 and constructing the concrete structure 11, the steel sheet piles 10 are pulled out.

(2) As shown in Figures 15 and 16, if space cannot be secured to install scaffolding for outer formwork assembly, steel sheet piles 10 should be placed close to the planned construction location of concrete structure 11. , a steel sheet pile wall 1 for earth retaining consisting of a large number of steel sheet piles 10 is used also as an outer formwork, and a separator 4 is attached to the steel sheet pile wall 1.
One end is directly fixed, the inner formwork 8 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 8 to form the concrete structure 11. Build. Since the steel sheet pile 10 is fixed to the separator 4, the steel sheet pile 10 is buried without being pulled out.

However, in the case of method (1) above, it is necessary to provide a relatively wide space 15 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 10 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 periods. be.

In addition, in the case of method (2) above, even after the concrete structure 11 is constructed, the steel sheet piles 10 are fixed to the separators 4 in the concrete structure and cannot be removed, and all the steel sheet piles are buried. There is a problem that the construction cost will be significantly higher because of this.

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: After excavating and removing earth and sand from the steel sheet pile wall 1 that has been cast to surround the concrete structure construction site, a plurality of separator support members 3 are fixed in the recess 2 inside the steel sheet pile wall 1 at intervals in the vertical direction. Then, each separator support member 3 and a hooking member 5 connected to a plurality of separators 4 arranged at intervals in the vertical direction,
Each separator 4 is connected to the steel sheet pile wall 1 through an anchor rod 6 which is inserted and removably inserted across them.
The separator 4 maintains the distance between the edge cutting plate 7 and the inner formwork 8, and then the edge cutting plate 7 and the inner formwork After the concrete 9 poured between the sections 8 and 8 has hardened, the anchor rod 6 is removed and the connection between the separator support member 3 and the hooking member 5 is released, and then the steel sheet pile 10 constituting the steel sheet pile wall 1 is removed. A formwork construction method for a concrete structure using steel sheet pile walls for earth retaining, which is characterized by pulling out.

[Example] Next, the present invention will be explained in detail with reference to examples shown in FIGS. 1 to 5.

First, as shown in FIGS. 1 to 3, a steel sheet pile wall 1 consisting of a large number of steel sheet piles 10 is placed in the ground 12 in close proximity to the planned construction location of the concrete structure, and then the steel sheet pile wall 1 Ground 1 surrounded by
2 is excavated, leveled concrete is placed on the excavated ground surface, base reinforcing bars are assembled on top of the leveled concrete, and then base concrete 16 is placed.

Next, a plurality of inverted dog-shaped separator support members 3 are fixed to the inner surface of the bottom plate of the inner recess 2 in the steel sheet pile wall 1 at intervals in the vertical direction by welding or the like, and attached to one end of the outer screw rod 17 for the separator. With the hooking members 5 made up of connected ring chains placed on the separator support member 3, a steel anchor rod 6 is inserted and removably inserted between each of the hooking members 5 and each separator support member 3. By doing so, each hooking member 5 is hooked to each separator support member 3.

Next, as shown in FIGS. 4 and 5, an adjustment receiving piece 18 such as a screw washer or a nut is screwed onto the outer screw rod 17, and a backing plate 19 is fitted, and then a flat edge cutting plate is fitted. The outer screw rod 17 is inserted into the through hole provided in the outer screw rod 7, the edge cutting plate 7 is brought into contact with the inner surface of the steel sheet pile wall 1, and the retaining plate 20 fitted into the outer screw rod 17 is inserted into the inner surface of the edge cutting plate 7. At the same time as coming into contact with
A fastener 21 such as a screw washer or a nut is screwed onto the outer screw rod 17, and the adjustment receiving piece 18 and the fastener 2 are screwed together.
1 holds the edge cutting plate 7 in place via the backing plate 19 and the holding plate 20.

Next, the inner end of the inner screw rod 22 for separator is fixed to the outer end of the outer screw rod 17 by welding, adhesive, or other means, and the inner screw rod 22
A water stop material 23 such as a rubber plate or a steel plate is penetrated into the middle part of the molding member 22 to be watertightly attached, and a formwork receiving piece 24 is fixed or hooked to the inner end side of the inner screw rod 22.

Next, after assembling and installing the wall reinforcing bars inside the edge cutting board 7, the inner formwork 8 is placed inside the wall reinforcing bars.
Insert the inner screw rod 22 into the through hole, engage the inner formwork 8 with the formwork receiving piece 24, and arrange the vertical beams 25 and horizontal beams 26 on the front side of the inner formwork 8, Furthermore, the presser washer 27 is fitted into the inner protrusion of the inner screw rod 22, and the nut 28 is screwed on, thereby completing the assembly and installation work of the formwork.

The outer screw rod 17, the inner screw rod 22, and the adjustment receiving piece 1
8. While keeping the distance between the edge cutting plate 7 and the inner formwork 8 constant by the separator 4 consisting of the fastener 21 and the formwork receiving piece 24, etc., the edge cutting plate 7 and the inner formwork 8 are
After pouring the concrete 9 that constitutes the structure between the two and curing the concrete 9, the inner formwork 8, the vertical beams 25, the horizontal beams 26, and the presser washers 2 are placed.
7. Remove the nut 28, etc., and then remove the inner screw rod 22.
After removing the protruding portion and further pulling out the anchor rod 6 to release the connection between the separator support member 3 and the hanging member 5, the steel sheet pile 10 constituting the steel sheet pile wall 1 is pulled out using a vibrating pulling device. and collect it.

FIGS. 6 and 7 show a state in which another example of the hooking member 5 is connected to the separator support member 3, and shows a female threaded cylinder 30 fixed to the curved end of the shackle 29 by welding or the like. One end of the outer screw rod 17 for the separator is screwed together, one end of the connecting fitting 31 is arranged between both arms of the shaft 29 and pivotally connected by the horizontal shaft 32, and the other end of the connecting fitting 31 is connected to the steel sheet pile. The separator support member 3 is placed on the separator support member 3 fixed to the separator support member 10.
The anchor rod 6 is inserted through the through hole of the connecting fitting 31 and the connecting fitting 31, and the connecting fitting 31 is further provided with a stopper pin 33 for preventing the shaft 29 from rotating downward about the horizontal shaft 32. It is inserted. In addition, in FIG. 3 and FIG. 5, 34 is a concrete adhesion prevention plate to the steel sheet pile.

FIGS. 8 to 11 show the state in which other examples of separator support members 3 are attached to the steel sheet pile 10. In the case of FIGS. 8 and 9, flat steel separator supports are shown. The end of the member 3 is the steel sheet pile 1
In the case of FIGS. 10 and 11, the ends of the steel separator support member 3 having a grooved cross section are fixed to the steel sheet pile 10 by welding.

As the edge cutting plate 7, the backing plate 19, and the holding plate 20, for example, wooden plywood, steel plate, or plastic plate is used. The material of the separator support member 3 and the inner formwork 8 may be, for example, steel, wood, or plastic.

〔Effect of the invention〕

According to this invention, 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, a plurality of separator support members 3 are installed in the recess 2 inside the steel sheet pile wall 1 in the vertical direction. Each separator support member 3 and a hooking member 5 connected to a plurality of separators 4 arranged at intervals in the vertical direction are inserted and removably inserted into and out of each separator support member 3. Connected via anchor rods 6, each separator 4 is inserted through the edge cutting plate 7 and inner formwork 8 that are in contact with the inner surface of the steel sheet pile wall 1, and the separator 4 connects the edge cutting plate 7 and the inner formwork. 8, and then concrete 9 constituting the underground structure is poured between the edge cut plate 7 and the inner formwork 8, so that the concrete 9 is brought close to the steel sheet pile wall 1 and the steel sheet pile It can be poured without adhering to the wall 1, and after the concrete 9 has hardened, the anchor rod 6 is pulled out, and then the steel sheet piles 10 that make up the steel sheet pile wall 1 are pulled out and recovered. Sheet pile wall 1 and concrete structure 11
After constructing a concrete structure without creating a large space between them, the steel sheet piles 10 and anchor rods 6 that make up the steel sheet pile wall 1 can be recovered, reducing the construction scope and reducing the amount of earthwork.
In addition to reducing the number of steel sheet piles used, it is possible to construct a concrete structure in a short construction period and at low construction cost, and the separator 4 can be easily and quickly hung on the steel sheet pile wall 1 by a simple means. Effects such as being able to do the following can be obtained.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, and FIG. 1 shows a state in which a separator support member attached to the inside of a steel sheet pile wall is connected to a separator support member attached to an outer screw rod. FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along line A-A in FIG. 2, FIG. 4 is a plan view showing the assembled formwork device, and FIG. FIG. Figure 6 is a side view showing a separator support member connected to another hanging member, Figure 7 is a plan view thereof, and Figure 8 is another example of a separator support member attached to a steel sheet pile. FIG. 9 is a perspective view showing the state, FIG. 9 is a longitudinal side view thereof, FIG. 10 is a perspective view showing another example of a separator support member attached to a steel sheet pile, and FIG. 11 is a longitudinal side view thereof. Figure 12 is a schematic perspective view showing the steel sheet pile driving situation when implementing the conventional concrete structure construction method;
Figure 14 is a schematic longitudinal side view showing an example of a conventional concrete structure construction method, Figure 14 is a plan view showing the relationship between a steel sheet pile wall and a concrete structure in that construction method, and Figure 15 is a conventional concrete structure. Schematic vertical side view showing another example of the construction method, 1st
FIG. 6 is a plan view showing a concrete structure and a steel sheet pile wall constructed by this construction method. 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 a hanging member, 6 is an anchor rod, 7 is an edge cutting plate, 8 is an inner formwork, 9 is concrete , 10 is a steel sheet pile, 11 is a concrete structure, 16 is a base concrete,
17 is an outer screw rod for the separator, 18 is an adjustment receiving piece,
21 is a tightening tool, 22 is an inner screw rod for separator, 2
4 is a formwork support piece, 25 is a vertical flap member, 26 is a horizontal flap member, 27 is a presser washer, and 28 is a nut.

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,
A plurality of separator support members 3 are fixed to a recess 2 inside a steel sheet pile wall 1 at intervals in the vertical direction, and each separator support member 3 is connected to a plurality of separators 4 arranged at intervals in the vertical direction. The separators 4 are connected to the retaining members 5 through the anchor rods 6 which are removably inserted therethrough, and each separator 4 is connected to the edge cutting plate 7 and the inner mold which are in contact with the inner surface of the steel sheet pile wall 1. The concrete 9 is inserted into the frame 8 and the spacing between the edge cutting plate 7 and the inner formwork 8 is maintained by the separator 4, and then the concrete 9 poured between the edge cutting plate 7 and the inner formwork 8 is hardened. A steel sheet pile for earth retaining characterized in that the anchor rod 6 is pulled out to release the connection between the separator support member 3 and the hanging member 5, and then the steel sheet pile wall 10 constituting the steel sheet pile wall 1 is pulled out. Formwork construction method for concrete structures using walls.