JP2602466B2 - Steel casting jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel material for securing a perfect circle when steel materials such as steel sheet piles, shaped steel, steel pipes, steel pipe sheet piles, etc. are cast in a circular shape by a method for countermeasures against liquefaction of the ground. Related to casting jigs.

[0002]

2. Description of the Related Art As a so-called ground liquefaction countermeasure method, there is a structure enclosing method performed after a structure is constructed.
FIGS. 5 and 6 show examples of such a structure. In FIG. 5, reference numeral 1 denotes a tank or other existing structure. The base ground of the existing structure 1 is a ring-shaped sheet material such as sheet pile or the like, which is connected to sheet piles 2. It is surrounded and bent by the partition plate 3.

[0003] The principle of such an enclosing method is to increase the rigidity of the ground and reduce the shear strain caused by the sediment in the interior by preventing the liquefaction as much as possible by encircling and bending the ring-shaped partition plate 3. According to the idea.

Further, as shown in FIGS. 7 and 8, a ring-shaped partition plate 3 may be provided in a multiplex manner.

[0005]

In order to form the ring-shaped partition plate 3 as described above, conventionally, an H steel or the like is directly determined and positioned by surveying, and is fixed by a pile or the like. Sheet steel 2 for sheet pile is cast in accordance with the H steel or the like, and no special jig is used.

Therefore, positioning by surveying is complicated, and it is extremely difficult to secure a perfect circle due to construction errors and the like.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a steel casting jig capable of easily positioning and securing a perfect circle for driving a steel sheet pile.

[0008]

According to the present invention, in order to achieve the above object, a ring wall is provided around an existing structure, and the ring wall is attached to an upper end of the ring wall so as to extend over the ring wall. A fixed device that moves by moving is installed, and an arc-shaped ruler made of mold steel is juxtaposed at intervals and a ruler body in which an arc-shaped steel material casting space is formed between the ruler and the fixing device is connected by a telescopic arm. The main point is that a plurality of fixing devices are arranged at appropriate intervals, and the telescopic arm is provided in a truss-like shape with the ruler.

[0009]

According to the first aspect of the present invention, since the ruler body has an arc-shaped steel material placing space, it serves as a guide for steel material placing, and the steel materials can be arranged in a perfect circle. Also, if you move the fixing device along the ring wall,
Since the ruler connected to the fixing device by the telescopic arm also moves concentrically with the ring wall, the steel material can be sequentially moved in the arc-shaped steel material driving space to extend the continuous connection of the steel material.

According to the second aspect of the present invention, in addition to the above-mentioned operation, the connection between the ring wall and the ruler is taken into consideration so that the truss structure becomes stable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of a steel casting jig of the present invention, and FIG. 2 is a plan view of the same. FIG. 3 is an overall plan view showing a use state, and FIG. 4 is an upper side view of the same.

In FIGS. 3 and 4, reference numeral 1 denotes a tank and other existing structures as in the above-mentioned conventional example. In this embodiment, as a countermeasure method for liquefaction of the ground, the foundation ground of the existing structure 1 is sheeted. This is a case in which an enclosing method is performed in which a steel sheet material 2 for piles such as a pile is joined and bent by a ring-shaped partition plate 3.

A ring wall 5 made of reinforced concrete as a retaining wall of the tank mound 4 is provided on the outer periphery of the tank mound 4 which is the foundation of the existing structure 1.

The present invention utilizes this ring wall 5, and is a hook-shaped U-shaped member 6a which covers the upper end of the ring wall 5 so as to straddle the ring wall 5 and attaches to the connection metal member 6a. The fixing device 6 is constituted by the pressing bar 6b using a screw.

An end of the metal fitting 6a is extended, and a telescopic arm 7 is provided with a length adjusting connecting part 7a formed by a screw rod in the middle, and a ruler body 8 is attached to a tip end thereof.

The ruler body 8 is formed by arranging arc-shaped rulers 8a and 8b, which are formed by curving a mold steel material such as an H-section steel, at intervals, thereby forming an arc-shaped steel material placing space 8c therebetween. The ends are connected by a connecting member 8d.

The fixing device 6 is a ring wall 5
A plurality of telescopic arms 7 are arranged at appropriate intervals on the upper side, and there are a plurality of telescopic arms 7 in accordance with the fixing device 6, but the telescopic arms 7 are arranged diagonally between the parallel telescopic arms 7 so that the whole has a truss structure. And

Next, the method of use will be described. The ruler body 8 is installed outside the ring wall 5, and the metal fitting 6 a is pressed and fixed to the upper end of the ring wall 5 by the pressing bar 6 b, whereby the ruler body 8 is fixed. Is connected to the ring wall 5 via a telescopic arm 7 and a fixing device 6.

Therefore, in order to determine the distance between the ruler body 8 and the ring wall 5, the length adjusting joint 7 of the telescopic arm 7 is required.
By adjusting a, the length of the telescopic arm 7 may be changed. In this case, the ring wall 5 and the arc-shaped steel material placing space 8c of the ruler body 8 are arranged concentrically.

In this way, by using the arc-shaped steel material placing space 8c of the ruler body 8 as a guide, the vibrating pile driving machine 9 successively drives the sheet pile steel materials 2 such as sheet piles while joining them together, so that the ring wall can be formed. This steel sheet material 2 for sheet pile can be cast in the same perfect circle as 5.

When the sheet pile steel material 2 has been driven to the vicinity of the end of the arc-shaped steel material driving space 8c, the pressing bar 6b
Then, the fixing device 6, the extensible arm 7 and the ruler 8 are moved along the ring wall 5, and are re-installed to repeat the similar driving of the sheet pile steel material 2.

[0022]

As described above, the steel casting jig of the present invention is easy to position and secure a perfect circle for driving steel for sheet pile.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of a steel casting jig of the present invention.

FIG. 2 is a plan view of a main part showing one embodiment of a steel casting jig of the present invention.

FIG. 3 is an overall plan view showing a use state of the steel casting jig of the present invention.

FIG. 4 is an overall side view showing a use state of the steel casting jig of the present invention.

FIG. 5 is a plan view showing an example of a countermeasure method for liquefaction of the ground.

FIG. 6 is a longitudinal sectional side view showing an example of a method of countermeasures against liquefaction of the ground.

FIG. 7 is a plan view showing another example of a countermeasure method for liquefaction of the ground.

FIG. 8 is a longitudinal sectional side view showing another example of a countermeasure method for liquefaction of the ground.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Existing structure 2 ... Steel material 3 ... Ring-shaped partition plate 4 ... Tank mound 5 ... Ring wall 6 ... Fixing device 6a ... Coupling hardware 6b ... Pressing bar 7 ... Expansion arm 7a ... Length adjustment connection part 8 ... Regular body 8a, 8b: Arc-shaped ruler 8c: Steel material setting space 8d: Connecting material 9: Vibration pile setting machine

Claims (2)

(57) [Claims] 1. A ring wall is provided around an existing structure, and a fixing device is attached to the upper end of the ring wall so as to straddle the ring wall and moves along the ring wall. A steel casting jig comprising: a ruler member having a ruler formed in parallel with a space therebetween and forming an arc-shaped steel casting space between the ruler and the fixing device; 2. A plurality of fixing devices are arranged at appropriate intervals,
The telescopic arm is provided in a truss shape between the telescopic arm and the ruler body.
The described steel casting jig.