JPH063006B2 - Filling material for joint material for embankment block - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint material that vertically seals a space between a plurality of blocks installed on a foundation for embankment.

Prior art and its problems When constructing gravity-type revetment walls, breakwaters, and oil breakwaters,
If the space between the blocks (joint) such as caisson and cellular blocks arranged and installed on the foundation is not closed by sealing means, the sand or oil behind the wall dike will leak through that part. .

Conventionally, as a joint material, a hollow body made of a flexible material (eg, rubber, synthetic resin) filled with water sand, underwater concrete, or asphalt is used.

However, since the molten sand, underwater concrete, asphalt, etc. filled in the hollow body are not in a state of being compressed and elastically deformed, if the positions of adjacent blocks are misaligned after installation and the joint space widens. The joint material does not expand or follow, and the sealing property between the blocks is impaired.

In order to solve this drawback, a water-swellable rubber is used, and the water-swellable rubber is inserted into a hollow body made of a flexible material together with water,
By expanding the hollow body made of flexible material using the expansion pressure of water-swellable rubber, it is pressed against the wall surfaces of both blocks,
Therefore, a method of sealing the joint was proposed.

The water-swellable rubber used in the method is a long-walled thick body having a rectangular cross section or a columnar body, and a water conduit having a large number of openings in its peripheral wall is embedded inside and over the entire length. Since the water conduit has a high rigidity, the water swelling rubber cannot be folded (pointing to a fold or a spiral curve). Therefore, if the length of the water-swellable rubber is large, it is difficult to carry it, and when inserting the water-swellable rubber into the hollow body made of a flexible material, a large facility such as a crane is used. Alternatively, it is formed as a divided body and is inserted while connecting the divided bodies together with a joint, resulting in poor handleability, complicated construction, and high construction cost.

Means for Solving the Problems An object of the present invention is to provide a filling member for a joint material for embankment blocks, which can be easily transported and constructed and can follow changes in joint spacing.

The purpose is to be inserted into a hollow body made of a flexible material having a closed lower end, and a filling member that forms a joint material together with the hollow body is formed of water-swelling rubber, and has a width larger than its thickness, This is achieved by forming a foldable plate-like body and embedding a rigid plate at the end on the insertion side.

EXAMPLE An example of the present invention shown in FIGS. 1 to 6 will be described below.

FIG. 1 shows, as a partially omitted perspective view, a filling member 10 formed of a known water-swelling rubber having a characteristic of chemically absorbing water and expanding. The width w is sufficiently larger than the thickness t, the length l is several tens of times the width w, the thickness t is constant over the entire length, and the width w is larger at the upper end than at the lower end. Is gradually changing to become.
A rigid plate 12 (steel plate or resin plate) for giving rigidity to the portion is embedded in the lower end of the filling member 10.

The filling member 10 can be easily bent, and during transportation, it is spirally folded around the rigid plate 12 as shown in FIG.

Further, FIG. 3 shows a flexible material (rubber or soft resin).
The hollow body 14 is shown as an abbreviated perspective view.
Reference numeral 14 is a bottomed bag-like body, and is sized so that the filling member 10 can be completely inserted by expanding the inner wall portion 16 thereof, and the width W in the closed state is the filling member. It is about twice the width w of 10 (W≈2w).
The hollow body 14 with the filling member 10 inserted therein is used as a joint material between blocks such as Soken.

FIG. 4 shows, as a cross-sectional view, for example, the sokens 20, 20 installed on the seabed as the foundations of a breakwater, and the hollow bodies 14 inserted from above into the gaps 22 between them. Water is injected into the hollow body 14. The filling member 10 is inserted into the hollow body 14 in this state from the rigid plate 12 side, and the space between the filling member 10 and the hollow body 14 is filled with the powder material (eg, sand, fine glass, etc.) 18. After that, the upper end of the hollow body 14 is closed using a special jig. During this time, the water-swellable rubber filling member 10 absorbs water and tries to expand,
The presence of the caisson 20,20 hinders its expansion and presses the hollow body 14 with a strong pressure against the surface of the caisson 20,20 (see FIGS. 5 and 6).

If it is necessary to supplement the water inside the hollow body 14 after the fact, a water injection port may be provided at the upper end of the hollow body 14.

Thus, the space 22 between the caissons 20, 20 sealed by the joint material S composed of the filling member 10 and the hollow body 14 causes the crustal movement,
The filling member 10 that has changed slightly due to an earthquake etc. and increased, and whose expansion has been suppressed, follows the movement of the caisson 20,
Upon expansion, the seal of the gap 22 is guaranteed. The volume expansion coefficient of the water-swellable rubber filling member 10 can be expected to be about 300%, and the higher the expansion pressure, the higher the reliability of the joint material S.

Moreover, since the cross-sectional area of the filling member 10 is gradually increased from the lower end toward the upper end, the swelling pressure is also large on the upper end side, and the filling member 10 can strongly oppose the wave force (high wave resistance). Further, the filling member 10 not only has a narrow lower end portion but also includes the rigid plate 12, so that the filling member 10 can be easily inserted into the hollow body 14, and the rigid plate 12 is made of steel. Then, it functions as a weight body, and the work of inserting the filling member 10 is further facilitated.

Furthermore, even if the space 22 between the caisson 20, 20 is quite narrow,
Since the filling member 10 is a plate-like body, it is possible to secure a sufficiently large cross-sectional area of the filling member 10 by increasing its width dimension, obtain a necessary swelling pressure, and perform reliable sealing. it can.

Furthermore, since the filling member 10 can be freely folded, it does not hinder transportation even if it is sufficiently long, and its insertion into the hollow body 14 can be easily performed, resulting in a construction cost. Can be attempted.

Although the width w of the filling member 10 is changed in the lengthwise direction in the above-mentioned embodiment, it can be made constant if necessary.
Alternatively, the thickness t can be changed in the longitudinal direction.

EFFECTS OF THE INVENTION As is apparent from the above description, in the filling member according to the present invention, the filling member is formed of water-swelling rubber, has a width larger than its thickness, and is formed into a foldable plate-like body, Since the rigid plate is embedded in the end on the insertion side, it is possible to easily carry and install the filling material, and even if the joint space is quite narrow, by increasing the width of the filling member, It is possible to secure a necessary cross-sectional area and obtain a large swelling pressure. Further, by changing the cross-sectional area of the filling member in the longitudinal direction, it is effective in the difference in the depth direction of the external force acting on the joint material formed by inserting the filling member into the hollow body made of a flexible material. Can be dealt with.
Further, the joint material formed by inserting the filling member into the hollow body made of a flexible material can well follow the change in the joint space due to the swelling pressure of the filling member, and the reliability of the sealing is guaranteed.

[Brief description of drawings]

FIG. 1 is a partially omitted perspective view of a filling member according to an embodiment of the present invention, FIG. 2 is a side view showing a folded state of the filling member, and FIG. 3 is a flexible material forming a joint material together with the filling member. A partially omitted perspective view of the hollow body made of a material, FIG. 4 is a cross-sectional view showing a state in which the hollow body made of a flexible material is inserted between caissons, and FIG. FIG. 6 is a perspective view of an essential part showing a state where the joint part is sealed, and FIG. 6 is a transverse sectional view of the essential part. 10 ... Filling member, 12 ... Rigid plate, 14 ... Hollow body, 16 ... Inner wall portion,
20 ... Caisson, 22 ... Spacing, S ... Joint material.

Claims (1)

[Claims] 1. A joint material which is used as a joint material for vertically sealing between a plurality of embankment blocks installed on a foundation, and a joint member is formed by inserting a filling member into a hollow body made of a flexible material having a closed lower end. Material, a joint material for embankment blocks, which is made of water-swellable rubber, has a width that is larger than its thickness, and is a foldable plate, and in which a rigid plate is embedded at the end on the insertion side. Filling member.