JP5492644B2 - Method and structure for reinforcing harbor structures - Google Patents

Description

  The present invention relates to a method for reinforcing harbor structures such as existing concrete caisson quay walls, breakwaters, gravity-type revetments, culverts, and the like, and a reinforcing structure thereby.

  Formerly, existing harbor structures such as breakwaters, for example, form a foundation solidified layer by discharging a solidifying agent to a foundation rubbing layer created by laying a large amount of foundation rubbing under the caisson quay to reinforce earthquake resistance. Then, a rod for jetting and stirring is installed on the lower ground of this foundation solidified layer, and this rod is gradually pulled up while injecting the solidification material from its tip, so that it is against the lower ground of the foundation solidified layer. A reinforcement method for improving the ground is known (see Patent Document 1). Such seismic reinforcement can cope with the increase in wave pressure caused by sea level rise due to global warming in recent years.

JP 2000-248527 A

  However, it is assumed that the increase in wave pressure caused by the sea level rise due to the global warming described above makes the bay structure unstable with respect to overturning and sliding. Moreover, in order to prevent overtopping, a breakwater or the like may be raised, but the raising will further destabilize the fall. Therefore, conventionally, countermeasures have been taken by installing wave-dissipating blocks outside the port, placing concrete on the back, installing rubble inside the port, or updating to a new construction. However, the conventional construction method has a problem that the route becomes narrow and it is necessary to secure a production yard, and the construction period is long and the cost is high. Under such circumstances, there is a demand for a reinforcement measure that is simpler than the usual reinforcement measures, has a shorter construction period, and does not increase the cost. The reinforcement method and reinforcement structure of a harbor structure according to the present invention have been proposed to solve such problems.

The gist for solving the above-mentioned problems of the method for reinforcing a harbor structure according to the present invention is to provide a concrete frame placed on the installation ground and having an upper opening, and the interior of the concrete frame In a method of reinforcing a bay structure composed of an intermediate sand layer packed in a space so as to resist an increase in wave pressure, the bottom of the concrete frame penetrates from the intermediate sand layer of the concrete frame. The anchor drilled to the bottom of the installation ground, the anchor installed under the installation ground, the tension material connecting and tensioning the anchor and the upper part, and the tension material installed on the upper portion of the filling layer together to fix to reinforce the Gulf structure by a ground anchor comprising an end portion with a fixing member for fixing after tension, when to penetrate by drilling the bottom of the skeleton, the hole of the bottom portion May be provided with inflatable packers that can be closed in tendon, it is to close the hole of the bottom portion in the packer after drilling.

When drilling and penetrating the bottom part of the casing, the infiltration of water from the hole in the bottom part is prevented by solidifying sand with a solidifying material to the vicinity of the bottom part of the casing.
Moreover, installing a shear reinforcement member around the tension material in a ground anchor or an anchor is included.

The gist for solving the above-mentioned problems of the reinforcing structure for a harbor structure according to the present invention is to provide a concrete frame placed on the installation ground and having an upper opening, and the interior of the concrete frame A gulf structure consisting of an intermediate packed sand layer packed in the space is waved by a ground anchor provided from the upper part of the intermediate packed sand layer to the bottom of the installation ground through the drill hole in the bottom of the frame. It is reinforced to resist the increase in pressure, and the hole drilled in the bottom of the concrete casing is closed by an inflatable packer attached to a tension member in the ground anchor. is there.

  According to the reinforcing method and reinforcing structure of a port structure of the present invention, the existing port structure is stably supported by the ground by the ground anchor and used as it is, and there is no influence on the route of the ship entering the port, The construction period is short, the work is prepared, and there is an excellent effect that the cost does not increase.

It is the longitudinal cross-sectional view (A) which shows the reinforcement structure by the reinforcement method of the harbor structure which concerns on this invention, and the longitudinal cross-sectional view in case the anchor 1a is made into the bulb | ball shape by excavation. It is a front view of the ground anchor used for the reinforcement method of the harbor structure of the same invention. It is a longitudinal cross-sectional view which shows that it is necessary to prevent permeation of the water from a drilling hole in the reinforcement method of the harbor structure of this invention. It is a partially expanded longitudinal cross-sectional view (A) and (B) which shows the method of closing a drill hole.

  As shown in FIG. 1, a harbor structure according to the present invention, for example, a dike (a known structure such as an inclined type, an upright type, a hybrid type), a gravity-type revetment, a culvert, etc. The harbor structure 2 is stably placed.

  As shown in FIG. 1, a concrete frame (caisson or the like) 4 placed on an installation ground (mound) 3 and having an upper opening, and a medium-packed sand layer 5 packed in the internal space of the concrete frame 4. The gulf structure 2 is reinforced so as to resist the increase in wave pressure.

  A hole is drilled by a boring machine (not shown) from the filled sand layer 5 of the concrete casing 4 to the bottom 4a of the concrete casing 4 and below the installation ground 3. This boring machine is carried by, for example, a trolley and is landed on the intermediate-packed sand layer 5 so as to be self-propelled to a required position.

  With the boring machine, the intermediate-packed sand layer 5 is excavated while penetrating the casing, and a hole 4b is formed in the bottom portion 4a. Then, after excavating to a predetermined depth, the grout and the anchor 1a are inserted, and the casing is pulled out.

  A concrete reaction force body 1c is installed on the intermediate-packed sand layer 5, or is cast into a formwork with cast-in-place concrete to form a reaction force body 1c. 1d is temporarily screwed. After the grout of the anchor 1a is solidified and the required strength is developed, and after the strength of the reaction force body 1c of the cast-in-place concrete is developed, the tension material 1b is pulled with a jack and the fixing nut 1d is fastened. The cap 1e is attached to the head of the tension material 1b in order to prevent rust.

  As shown in FIG. 2, the ground anchor 1 uses, for example, a tieable anchor A type (manufactured by S.E. Co., Ltd.) having a structure in which anticorrosion performance and seismic performance are confirmed. Moreover, since it uses for the fall prevention of the gulf structure 2, it arrange | positions closer to the port outer side rather than the center of the gulf structure 2 so that it may become advantageous with respect to a fall moment.

  Thus, the anchor 1a installed under the installation ground 3, the tension member 1b for connecting and tensioning the anchor 1a and the upper portion, and the upper portion of the filling layer 5 are installed on the tension member 1b. The bay structure 2 is reinforced and fixed by a ground anchor 1 composed of a fixing body (reaction body 1c, fixing nut 1d) that fixes the end portion after tension.

  Even if there is an increase in wave pressure due to sea level rise due to global warming, as shown in FIG. 1, wave overtopping is prevented by a concrete raising body 6 and pressed against the installation ground 3 by the ground anchor 1. Thus, the frictional resistance is increased to prevent the harbor structure 2 from falling or sliding.

  When drilling and penetrating the bottom 4a of the housing 4, it is necessary to close the hole 4b of the bottom 4a as shown in FIG. This is because when the casing is pulled up by the drilling hole of the boring machine, the filling sand may be sucked out to the installation ground 3 side. Therefore, as shown in FIG. 4 (A), an inflatable packer (lid closing material) 7 is set at a required position and provided on the tensioning material 1b, and grout or the like is injected into the packer 7, As shown in (B), the hole 4b of the bottom 4a is closed with the packer 7 after drilling.

  As another method, when the bottom portion 4a of the casing 4 is drilled and penetrated, the sand of the middle-packed sand layer 5 is hardened with a solidifying material to the vicinity of the bottom portion 4a of the casing 4 so that the hole of the bottom portion 4a is obtained. It is to prevent water from entering from 4b.

  When the tension force by the ground anchor 1 alone cannot solve the lack of sliding resistance of the bay structure 2 such as a breakwater, the steel pipe 8 shown in FIG. 1 is used around the anchor 1a and the tension material 1b. A shear reinforcement member having shear strength such as the steel pipe 8 is installed. This reinforces the shear resistance.

  The method for reinforcing a gulf structure according to the present invention and the structure reinforced structure formed thereby are not limited to a sea wave breaker, a wave breaker, etc., but also a gravitational revetment, a culvert, a caisson or a tunnel set in a river It can also be applied to structures.

1 ground anchor, 1a anchor (fixing part),
1b tendon, 1c reaction body,
1d fixing nut, 1e cap,
1f anchor plate,
2 Gulf structures,
3 Installation ground,
4 concrete frame, 4a bottom,
4b hole,
5 Filled sand layer,
6 Raised body,
7 Packer,
8 Steel pipe.

Claims (4)

To resist the increase of wave pressure in the gulf structure consisting of a concrete frame placed on the installation ground and having an upper opening, and an intermediate packed sand layer packed in the internal space of the concrete frame In the method of reinforcing,
A hole is drilled from the middle sand layer of the concrete frame to the bottom of the installation ground through the bottom of the concrete frame, and the anchor and the upper part are connected to the anchor. And strengthening and fixing the bay structure by a ground anchor composed of a tension material that is tensioned and a fixing body that is installed on an upper portion of the filling layer and that fixes an end of the tension material after tension .
When drilling and penetrating the bottom of the housing, an inflatable packer capable of closing the hole at the bottom is provided in the tension material, and the hole at the bottom is closed with the packer after drilling,
Reinforcement method of harbor structure characterized by this. When drilling and penetrating the bottom of the housing, it prevents the infiltration of water from the hole at the bottom by solidifying sand with the solidifying material to the vicinity of the bottom of the housing,
The method for reinforcing a harbor structure according to claim 1 . Installing a shear reinforcement member around the tension material or anchor in the ground anchor;
The method for reinforcing a harbor structure according to claim 1 or 2 . A gulf structure consisting of a concrete frame placed on the installation ground and having an upper opening, and an intermediate sand layer packed in the internal space of the concrete frame,
Reinforced so as to resist the increase of wave pressure by the ground anchor provided from the upper part of the padded sand layer through the drilled hole in the bottom of the casing to the bottom of the installation ground ,
The hole drilled in the bottom of the concrete casing is closed by an inflatable packer attached to a tension member in the ground anchor;
Reinforcement structure of port structure characterized by

Images