JP2001140241A - Caisson joint sealing material and execution method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caisson joint sealing material capable of eliminating the deterioration caused by heating and quickly completing joint work in a narrow joint section. SOLUTION: A slurry caisson joint sealing material 7 is formed by cold mixing at least with fine aggregate, asphalt emulsion, cement and mineral powder and slurried.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint material for caisson for sealing joints between caissons and a method of constructing the joint material.

[0002]

2. Description of the Related Art In general, caisson is used for offshore artificial islands, the periphery of sea airports and general seawalls, etc., and its height is large and exceeds 15 m. In particular, in the case of installation in a place with bad ground, the gap formed between caisson is easily changed, and a high seal is indispensable.

[0003] For this purpose, a sealed state is secured by injecting and filling a heated caisson joint material typified by sand asphalt from above into one or two of the joints.

[0004]

After the installation is completed, the joint of the caisson is solidified by the solidification after the installation is completed, but the sealing state is secured by the joint material for the caisson. In some cases, poor sealing occurs.

[0005] Repair is performed on the portion where the seal failure has occurred, but if the gap at the joint is narrowed, it takes time to inject and fill the caisson joint material (sand asphalt) due to resistance at the time of injection. Or poor filling may occur due to insufficient fluidity. Moreover, since sand asphalt is constructed while being heated by a cooker truck, it takes too much time, and if it is carried over to the next day, it deteriorates and has to be disposed of.

[0006] In the caisson, between the lower part in the water and the upper part coming out of the water, the upper part which is directly affected by the outside temperature is greatly deformed by expansion and contraction. In the case of a caisson with already stable ground, the caisson joint material cannot follow the movement in the upper part where the deformation is large compared to the lower part where the deformation is small, or the seal leak increases due to the influence of the wave It had become.

Accordingly, an object of the present invention is to provide a caisson joint material which solves the above-mentioned problems and a method for constructing the same.

[0008]

According to the first aspect of the present invention, at least fine aggregate, asphalt emulsion, cement, and mineral powder are mixed at room temperature to form a slurry. I do.

[0009] Thus, when filling the joint portion, since the slurry is filled, it is smoothly filled to every corner, and the filling operation is completed quickly. In addition, since mixing is performed at room temperature, only a required amount can be produced by a simple mixer, so that there is no deterioration due to heat and no extra material is generated.

Of course, it is also possible to strike on the next day.

According to a second aspect of the present invention, a highly fluid slurry-like caisson joint material that solidifies with time is poured into a lower portion of the joint portion of the caisson, and a time When the solidification is completed, a caisson joint material having a large deformation performance is injected when the solidification is completed, so that the upper layer and the lower layer have different properties.

[0012] With this, the filling operation is completed quickly because the slurry has a high fluidity at the time of filling, and the filling material for caisson is filled in the lower part without fail.

Further, since the upper layer is filled with a caisson joint material having high deformation performance, the upper layer of the caisson follows the movement of the caisson even if it expands or contracts under the influence of the outside air temperature. In addition, the sealing state of the joint is reliably ensured.

According to a third aspect of the present invention, a filler having different properties in an upper layer portion and a lower layer portion is filled in a hollow cylindrical body having a flexible property inserted into a joint of a caisson. The filler in the lower layer is solidified over time in the form of a highly fluid slurry mixed at room temperature during filling, while the filler in the upper layer is solidified over time after filling. At the time of completion of solidification, it has properties of large deformation performance.

Thus, in the upper layer portion of the hollow cylinder, the joint portion of the caisson follows the state of expansion and contraction due to the property of large deformation performance, thereby ensuring a reliable sealing state of the joint portion. I do. In addition, the hollow cylinder facilitates seal management.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS.

FIG. 2 is a schematic plan view showing the joint 3 between the caisson 1 and the height of the caisson 1, for example, exceeds 15 m.

The joint portion 3 is sealed by filling a gap 5 between the caisson 1 and the sealing material 10 with a caisson joint material 7, for example.

The caisson joint material 7 is formed by mixing at least a fine aggregate such as sand, a nonionic asphalt emulsion, mineral powder such as cement and stone powder at room temperature, and forming a slurry. In this case, depending on conditions, coarse aggregate such as pebbles may be added. When the fine aggregate or the coarse aggregate is extremely dry, it is desirable to add water to make it wet.

Asphalt emulsions and cements are important materials that can have high fluidity and low deformability, or can have high fluidity and high deformability, depending on the mixing ratio. FIG. 3 shows an example of the most preferable composition of the material.

The joint material 7 for caisson thus constructed
Is injected into the gap 5 of the joint portion 3 from above. At the time of this injection, the caisson joint material 7 is in a slurry state, so that it is smoothly injected into the gap 5 of the joint portion 3 having a small width, and the filling operation is completed quickly. In this case, since the caisson joint material 7 is mixed at room temperature, the sealing material 10 by heating is used.
No deterioration occurs, for example, only the required amount can be manufactured for on-site manufacturing, and there is no uselessness.

FIG. 4 shows a second embodiment in which the upper layer 7b and the lower layer 7a have different properties when filling the caisson joint material 7. As shown in FIG.

That is, the hard CE concrete slurry or the hard CE mortar slurry shown in FIG. 3 is used to inject into the gap 5 of the joint 3 from above until the underwater liquid level X is almost reached from the bottom. At this time, the filling work is completed quickly due to high fluidity, and after solidification is completed,
The lower layer 7a having small deformation performance is obtained.

Next, the soft CE concrete slurry or the soft CE mortar slurry shown in FIG. 3 is poured into the lower layer portion 7a from above.

Thus, after the solidification is completed, an upper layer 7b having high deformability is obtained on the lower layer 7a.

Therefore, according to the second embodiment, the filling / filling operation is completed quickly due to the high fluidity. In addition, the upper part of the caisson 1 protruding from the water is greatly affected by the outside temperature in summer or winter compared to the lower part in the water, and therefore expands or contracts greatly. At this time, the joint material 7 for caisson of the upper layer portion 7b is
The large deformation performance follows the movement of the caisson 1 and ensures the sealing state. Since the lower part of the caisson 1 in the water does not fluctuate greatly, the lower part 7a of the caisson joint member 7 having small deformation performance can cope with it.

Depending on the site, one of the sealing members 10 for forming the gap 5 between the joints 3 may be ground.

FIGS. 5 to 7 show a third embodiment.

That is, in the joint portion 3 between the caisson 1, a hollow 11 for repair is provided vertically, for example, over 15 m. The hollow 11 is sealed by the hollow cylindrical body 9 and the caisson joint material 7. In addition, the hole diameter of the hollow hole 11 is suppressed to a small size in view of workability and strength around the hole.

Therefore, according to the fifth embodiment, the hollow cylindrical body 9 having a flexible property is inserted into the hollow hole 11 of the joint 3 and the hard CE
Fill the concrete slurry to form the lower layer 7a,
By filling the upper part with the soft CE concrete slurry to form the upper layer portion 7b, a reliable caisson joint material 7 that can follow the movement of the caisson 1 is obtained. Moreover, the seal management is facilitated by the hollow cylindrical body 9. Further, the lower layer 7a may be combined with cement concrete or cement mortar having good fluidity, or the upper layer 7b may be combined with sand asphalt or gravel mastic.

[0031]

As described above, according to the present invention, the filling operation can be completed quickly at the joint, and the working efficiency can be improved. Moreover, it is possible to follow the movement of the caisson that is different between the upper part and the lower part, and it is possible to secure a reliable sealing state.

Further, by mixing at room temperature, deterioration due to heating as in the prior art does not occur, and waste such as disposal due to deterioration is eliminated, and it can be always used as a caisson joint material having good performance.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway explanatory view of a caisson joint according to the present invention in which a caisson joint material is filled.

FIG. 2 is a schematic plan view of FIG. 1 as viewed from above.

FIG. 3 is an explanatory diagram showing an example of an optimal combination of materials when filling a caisson joint material having different properties between an upper layer portion and a lower layer portion.

FIG. 4 is an explanatory view showing a second embodiment in which caisson joint materials having different properties are filled in an upper layer portion and a lower layer portion in the joint portion.

FIG. 5 is a schematic plan view showing a third embodiment in which a hollow cylinder filled with fillers having different properties in an upper layer portion and a lower layer portion is inserted into a hollow of a caisson.

FIG. 6 is an explanatory view of a hollow cylinder filled with fillers having different properties in an upper layer portion and a lower layer portion.

FIG. 7 is a cutaway explanatory view in which the hollow cylindrical body of FIG. 6 is inserted and filled in an joint.

[Explanation of Signs] 7 Joint material for caisson

Claims (3)

[Claims] 1. A joint material for caisson wherein at least fine aggregate, asphalt emulsion, cement, and mineral powder are mixed at room temperature to form a slurry. 2. A joint material for caisson, which has a high fluidity during construction and solidifies with time, is poured into a lower portion of the joint portion of the caisson, and solidifies with time over the upper portion thereof. Inject large caisson joints,
A method for applying a joint material for caisson, wherein properties are different between an upper layer portion and a lower layer portion. 3. A hollow cylindrical body having the property of flexibility inserted into a joint of a caisson is filled with fillers having different properties in an upper layer and a lower layer, and the filler in the lower layer is At the time of filling, it is a highly fluid slurry that is mixed at room temperature.
A filler material for caisson that solidifies as time elapses while the upper filler solidifies as time elapses after filling and has a property of large deformation performance upon completion of solidification.