JPH044035Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an intermediate pressurized girder support structure employed when a caisson is press-fitted into the ground.

[Prior art]

Conventionally, as shown in Fig. 4, the method of press-fitting a large caisson into the ground involves press-fitting a long end press girder that extends in the left-right direction across the top of the side walls 2 on both the left and right sides of the caisson 1. 6 and a long intermediate pressure girder 7 are erected, and an anchor member 8 inserted and fixed in the ground is inserted into the end of each pressure girder, and a jack 9 fitted into the upper part of the anchor member 8 is inserted. A construction method in which the caisson 1 is press-fitted via the pressure girders 6 and 7 by placing it on the pressure girder, locking the upper end of the jack 9 to the anchor member 8, and causing each jack 9 to extend. Are known.

However, in the case of this construction method, since a long intermediate pressure girder 7 is constructed across the middle of the upper part of the caisson 1, the intermediate pressure girder 7 supports the caisson 1.
There is a problem in that the middle of the upper opening is blocked, which obstructs excavation work by a grab bucket or other excavator or other work, resulting in poor workability.

[Purpose of the invention, structure]

The purpose of this invention is to provide an intermediate pressurizing girder support structure for press-fitting a caisson that can advantageously solve the above-mentioned problems. The intermediate part of a short intermediate pressure girder 3 on which a jack is placed on the upper outer end is arranged in the intermediate part, and the upper end part of a steel support rod 4 extending vertically along the inner surface of the side wall 2 is located in the intermediate part. It is locked to the inner end of the pressurizing girder 3,
The lower end of the steel support rod 4 is engaged with a support member 5 fixed to the side wall 2, forming an intermediate press girder support structure for press-fitting a caisson.

〔Example〕

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

Figures 1 to 3 show an embodiment of this invention, in which a steel pressure receiving girder 10 extending in the longitudinal direction (back and forth direction) of the concrete caisson 1 is provided on the upper surface of the left and right side walls 2. It is placed,
In addition, at the intermediate upper part of each side wall 2 in the longitudinal direction, a longitudinally intermediate portion of a short steel intermediate pressure girder 3 extending in the left-right direction is placed on the upper surface of the pressure receiving girder 10,
Further, at the intermediate lower part of the intermediate pressure girder 3, there is a pressure receiving girder 10.
Positioning stopper 1 that engages on both sides in the width direction of
1 is fixed.

The upper ends of a plurality of support rods 4 made of steel rods are inserted into the inner end of the intermediate pressure girder 3, and the support rods 4 extend vertically along the inner surface of the side wall 2, and the lower ends of the support rods 4 The part is a steel support member 5 fixed to the side wall 2.
A nut 12 that engages with the upper and lower surfaces of the intermediate pressure girder 3 is screwed into a male threaded portion inserted into the support rod 4 and provided at the upper end of the support rod 4.
The male screw part provided at the lower end of the support member 5
A nut 13 that engages the upper and lower surfaces of the housing is screwed together.

The upper outer end of the intermediate pressure girder 3 and the left and right pressure receiving girders 10
A press-fitting jack 9 consisting of a hydraulic center hole jack is placed on the top of both ends of the long end pressurizing girder 6 which is constructed across both ends of the The clamp 15, through which the upper part of the anchor member 8 is inserted and which is removably engaged with the anchor member 8, is connected to the jack 9.
is arranged to engage the upper end of the.

When the jack 9 installed on the intermediate pressure girder 3 is extended, the support rod 4 and the support member 5 hold the intermediate pressure girder 3 in a stable state so that it does not tilt or fall off.

In the case of the above embodiment, two intermediate pressure girders 3 are arranged between the long end pressure girders 6; The number of digits 3 may be one, or three or more. Further, as the support member 5, any type other than those shown in the drawings may be employed.

[Effect of idea]

According to this invention, the side wall 2 of the caisson 1
An intermediate portion of a short intermediate pressure girder 3 on which a jack is placed on the upper outer end is arranged at the upper intermediate portion of the steel supporting rod 4 extending vertically along the inner surface of the side wall 2. The lower end of the steel support rod 4 is locked to the support member 5 fixed to the side wall 2, so that the upper middle of the caisson 1 It is possible to easily support the short intermediate pressure girder 3 so that it does not tilt or fall off in the vertical direction due to jacking thrust without constructing a long intermediate pressure girder that crosses the caisson 1. Since the area is not blocked by the intermediate pressurizing girder, it is possible to easily perform excavation work using a grab bucket or other excavator or other work.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention, in which Figure 1 is a perspective view showing the state when the caisson is press-fitted, and Figure 2 is a partially cutaway view showing the intermediate press girder support structure. The side view and FIG. 3 are partially cutaway longitudinal sectional front views showing the intermediate pressurizing girder support structure. FIG. 4 is a perspective view showing a state in which a caisson is press-fitted using a conventional intermediate pressurizing girder and an end pressurizing girder. In the figure, 1 is a caisson, 2 is a side wall, 3 is an intermediate pressure girder, 4 is a steel support rod, 6 is an end pressure girder, 8
is an anchor member, 9 is a jack, 10 is a pressure receiving girder,
11 is a positioning stopper, and 12 and 13 are nuts.

Claims (1)

[Scope of utility model registration request] In the middle part of the upper part of the side wall 2 in the caisson 1,
The intermediate part of the short intermediate pressurizing girder 3 on which the jack is placed on the upper outer end is arranged, and the upper end of the steel support rod 4 extending vertically along the inner surface of the side wall 2 is the intermediate pressurizing girder 3. An intermediate pressure girder support structure for press-fitting a caisson, characterized in that the lower end of the steel support rod 4 is locked to a support member 5 fixed to the side wall 2. .