JP3814788B2 - Pneumatic caisson tilt correction method and tilt correction bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic caisson inclination correction method and inclination correction in which a dry work space is formed at the bottom of a caisson that is submerged in the ground, and excavation work is performed in the work space and a load is applied from above to sink. Related to metal fittings.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, when the pneumatic caisson 1 is set up, excavation under the caisson is carried out in the dry work space 3 under the slab 2, and the load is applied from the slab 2 by water injection or the like so as to sink. However, there is a case where one side of the caisson 1 is quickly settled and the whole is inclined under the condition that the ground is not uniform.
[0003]
As a method of correcting this inclination, conventionally, as shown in FIG. 7, in the dry work space 3 formed in the blade edge 4 below the outer peripheral edge of the slab 2, a square member or the like is provided between the slab 2 and the ground 5. In general, the sanddle 6 is assembled by using this, and by this, the sedimentation on the side where the sedimentation is progressing fast, that is, the sedimentation on the lower side of the slope is prevented to return to the normal posture.
[0004]
In addition, as shown in FIG. 8, a method has been developed in which the guide roller 8 is pressed horizontally against the outer periphery of the caisson 1 by a hydraulic jack 7 and the inclination of the caisson 1 is controlled by pressing the guide roller 8.
[0005]
[Problems to be solved by the invention]
In such a conventional tilt correction method using a sandle, if the caisson has a sufficiently large diameter, a rotational moment sufficient for tilt correction can be obtained by assembling the sandle under the slab edge, but the diameter is several. In the case of a caisson having a small diameter of about a meter, the position of the sanddle to be assembled has to be close to the center of the caisson, and thus there has been a problem that it is difficult to obtain the rotational moment necessary for correcting the inclination.
[0006]
In the method of controlling by pressing the guide roller with a hydraulic jack, it is necessary to install a guide device and its reaction body around the caisson at the set position, which requires a large space and an expensive device. There was a problem that it was not possible to use it for the sunk.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a method and an inclination correction metal fitting capable of effectively correcting inclination with a simple device even with a small-diameter caisson.
[0008]
[Means for Solving the Problems]
The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is to project a cylindrical blade mouth below the outer peripheral edge of the slab to make the inside a dry work space, When the pneumatic caisson that can be loaded on the slab is submerged in the ground, a flat plate-shaped loading plate is provided below the inclined lower edge of the caisson and the upper surface of the plate protrudes from the upper surface of the plate. A plurality of inclined protrusions extending in the width direction inclined at an angle so that the upper surface is in contact with the tapered surface below the blade edge of the pneumatic caisson, and projecting integrally on the plate, A pneumatic caisson inclination correction method comprising a metal fitting for inclination correction provided with a latching protrusion abutting outside the periphery, and correcting the inclination by delaying settling on the blade laying side, Inclination correction bracket of the invention The features are a plate-shaped loading plate, and a plurality of inclined projections extending in the width direction that are projected on the upper surface of the plate and inclined at an angle such that the upper surface is in contact with the tapered surface below the blade of the pneumatic caisson. And a latching projection that is integrally projected on the plate and is in contact with the outer peripheral edge of the blade edge.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
[0010]
1 to 3 show an example of an inclination correcting metal fitting according to the present invention. The metal fitting 10 has a pair of inclined projections 12 and 12 whose upper surfaces are inclined on the surface of a loading plate 11 having a rectangular flat plate shape and projecting in parallel in the front-rear direction. The latching protrusions 13 and 13 are integrally protruded at a distance from the end portion on the low-bulk side of 12, and a pair of handles 14 and 14 are protruded upward at both edges of the loading plate 11. ing.
[0011]
The inclination of the upper surfaces of the inclined protrusions 12 and 12 is formed at an angle corresponding to the taper of the lower surface of the blade edge of the pneumatic caisson described later, and the height of the latching protrusions 13 and 13 is above the inclined protrusions 12 and 12. Is formed at a height at which the outer edge of the blade edge abutted on is locked.
[0012]
Next, a method of correcting the inclination of the pneumatic caisson using the metal fitting 10 will be described with reference to FIGS.
[0013]
In the figure, 20 is a pneumatic caisson, and this caisson has a cylindrical blade 22 projecting downward from the outer peripheral edge of the slab 21 at the bottom, and a dry working space 23 is formed inside thereof. A drainage work cylinder 24 extending upward is connected to the center of the slab 21, and a water injection section 25 for loading is provided outside the slab 21.
[0014]
In the middle of sinking of the caisson 20, when an inclination occurs due to a difference in surrounding ground conditions or the like, the lower part of the lower blade edge 22 of the inclination as shown in FIGS. A metal insertion hole having a width and depth that can be inserted is formed by excavation, and metal fittings 10, 10... Are inserted into the holes, and the latching protrusions 13, 13 are positioned outside the tip of the blade edge 22.
[0015]
When the caisson 20 is allowed to sink in this state, the tapered surface 22a of the lower surface of the blade edge comes into contact with the upper surface of the inclined protrusions 12 and 12 in a state where the latching protrusions 13 and 13 of the metal fitting 10 are positioned outside the blade edge 22. The inclined lower side of the caisson 20 is loaded on the loading plate 11 in a state in which the movement of the metal fitting 10 with respect to the blade 22 is blocked.
[0016]
In this way, by allowing the metal fitting 10 to be interposed between the inclined lower side of the caisson 20 and under the ground and settling, the other side is settling while the settling of the side where the metal fitting 10 is interposed is prevented. The slope is corrected.
[0017]
When the metal fitting 10 is allowed to sink while being interposed on one side depending on the ground conditions, the entire caisson is allowed to sink while the metal fitting 10 is attached.
[0018]
【The invention's effect】
As described above, in the present invention, when inclination occurs during sedimentation of a pneumatic caisson, an inclination correction metal fitting that prevents sedimentation is interposed under the blade edge of the caisson, so that even a caisson having a small diameter can be used. The center of the moment acting in the inclination correction direction can be placed at the outermost part of the blade edge, and therefore a large rotational moment is obtained, and the inclination correction is effectively performed.
[0019]
Further, since the apparatus to be used is only a flat metal fitting to be laid under the blade edge, its manufacturing cost may be small, and it is easy to lay the metal fitting, saving space and being economical.
[Brief description of the drawings]
FIG. 1 is a plan view of an example of an inclination correcting metal fitting according to the present invention.
FIG. 2 is a front view of the above.
FIG. 3 is a side view of the above.
FIG. 4 is a longitudinal sectional view showing an insertion state of an inclination correction metal fitting in the inclination correction method of the present invention.
FIG. 5 is a bottom view of the same.
FIG. 6 is a partially enlarged vertical sectional view showing the state of the tilt correcting bracket device according to the above.
FIG. 7 is a cross-sectional view of an example of a conventional pneumatic caisson inclination correcting method.
FIG. 8 is a cross-sectional view of another example of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Metal plate 11 Loading plate 12 Inclination protrusion 13 Hanging protrusion 14 Handle 20 Numeric caisson 21 Slab 22 Cutting edge 22a Tapered surface 23 Dry work space 24 Excavation work pipe 25 Water injection part

Claims (2)

A cylindrical blade is provided below the outer peripheral edge of the slab to make the inside a dry work space. A plate-shaped loading plate under the lower blade edge of the slope, and a plurality of the upper surface projecting from the upper surface of the plate and inclined at an angle so that the upper surface contacts the tapered surface under the blade edge of the pneumatic caisson Providing a tilt correction fitting comprising an inclined projection directed in the width direction of the blade and a latching projection integrally projecting on the plate and abutting on the outer peripheral edge of the blade opening, Inclination correction method for pneumatic caisson that corrects the inclination by preventing the sinking of the mouth and delaying the sinking of the metal fitting laying side. A loading plate having a flat plate shape, a plurality of inclined projections extending in the width direction inclined to an angle with which the upper surface protrudes from the upper surface of the plate and contacts the tapered surface below the blade edge of the pneumatic caisson, A pneumatic caisson inclination correcting bracket provided with a latching protrusion integrally provided on the plate and abutting the outer peripheral edge of the blade edge.

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