JP5681988B2 - Breakwater reinforcement method and reinforced breakwater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a breakwater reinforcing method and a reinforced reinforcing breakwater for reinforcing the tipping strength and sliding resistance of an existing breakwater.

  As an example of a conventional breakwater, a structure in which an embankment structure made of caisson or the like is placed on a rubble foundation constructed by stacking stones on a water bottom is known.

  In recent years, due to the influence of abnormal weather and the like, waves with more energy than expected at the beginning of construction have rushed, and such waves cause the dam structure on the rubble foundation to slide relative to the rubble foundation. There was a risk that the breakwater function would be impaired.

  Therefore, in order to prevent such a dike structure from sliding, an additional caisson or the like is connected to the dike structure made of caisson or the like to increase the weight of the entire structure and increase the sliding resistance against the rubble foundation. Methods (for example, Patent Document 1) and methods (for example, Patent Document 2) in which a friction mat is interposed between a bank structure and a rubble foundation to increase friction between the two have been developed.

JP 2008-190254 A Japanese Patent Laid-Open No. 9-221761

  However, in the conventional method of increasing the weight of the dike structure as described above, a separate caisson is added to the existing dike structure, and they are integrated. However, there was a problem that the cost increased.

  In addition, it is difficult to install the friction mat on the existing breakwater by the method using the conventional friction mat, and even if such a mat is laid, a significant increase in the coefficient of friction cannot be expected. There was a problem that the effect was low.

  In view of such conventional problems, the present invention provides a breakwater reinforcing method and a reinforced breakwater that can be efficiently applied to existing breakwaters and that can obtain high tipping resistance and sliding resistance against waves. It was made as a purpose.

In order to solve the above-mentioned conventional problems and achieve the intended purpose, the feature of the invention described in claim 1 is that a bank structure is built on an existing rubble foundation constructed by stacking stones on a flat water bottom. In the method of reinforcing a breakwater that is placed so that the body is placed and separates the inland sea from the outside sea , a solidifying material is injected between the stone materials constituting the existing rubble foundation, and the solidifying material is solidified. A reinforcement foundation is formed under the bank structure to increase the weight of the rubble foundation, and a through hole is formed that penetrates the bank structure and the reinforcement foundation and reaches the bottom of the water. after inserting the coupling member consisting of rods or the like, the filling the grout between the through-hole inner surface and said coupling member, Ru is integrated with riprap foundation the reinforcing base portion and the dam structures are formed It is in the reinforcement method of the breakwater.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, a casing member having a drilling bit detachably attached to a lower end portion thereof is used, and the upper surface of the dam body structure is rotated while rotating the casing member. A through-hole penetrating from the bank structure to the rubble foundation and covering the inner surface of the through-hole with the casing member, and then pulling out the casing member while removing the casing member. The solidifying material is injected between the stone materials by discharging the solidifying material from the tip of the member.

  According to a third aspect of the present invention, in addition to the structure according to any one of the first and second aspects, a through-hole that penetrates the bank structure and the rubble foundation and reaches the water bottom ground is formed. The object is to insert a stirring rod into the water bottom ground through a hole, and to inject the solidified material around the tip of the stirring rod and stir to improve the water bottom ground around the rod.

According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects , the upper end portion of the connecting member is fixed to the bank structure.

Features of the invention described in claim 5, the existing riprap foundation built by stacking a stone on a flat water bottom, e Bei a dam structure body placed on該捨stone foundation, the open sea and inland In the reinforced breakwater installed so as to be separated , a reinforcing foundation was formed by injecting and solidifying the solidified material in the gaps between the stone materials of the existing rubble foundation under the dam structure, increasing the weight A rubble foundation, a through-hole penetrating over the bank structure and the reinforcing foundation and reaching the bottom of the ground, a connecting member inserted through the through-hole, and between the through-hole and the connecting member The reinforced breakwater includes a filled grout and integrates the bank structure and the rubble foundation on which the reinforcing foundation is formed .

  As described above, the breakwater reinforcement method according to the present invention is the breakwater reinforcement method in which a breakwater structure is placed on a stone foundation constructed by stacking stones on the bottom of the water. By injecting a solidifying material between the stone materials to be formed and solidifying the solidifying material, by forming a reinforcing foundation under the bank structure, the strength of the rubble foundation is increased, and the bank structure is stabilized on the rubble foundation. It can be placed in a state. Moreover, since the weight of the entire breakwater structure increases due to the injection of the solidifying material, the vertical reaction force received from the water bottom ground increases, and accordingly, the sliding resistance against the water bottom ground increases.

  Further, in the present invention, a casing member provided with a drilling bit in a detachable manner at the lower end portion is used, and the casing member is lowered from the upper surface portion of the levee body structure while rotating, and the rubble foundation from the dam structure body And forming the through-hole penetrating through the inner surface of the through-hole with the casing member, and then discharging the solidified material from the tip of the casing member while pulling out the casing member. By inject | pouring the said solidification material between stone materials, a solidification material can be inject | poured into the clearance gap between the stone materials which comprise a rubble foundation suitably.

  Furthermore, in the present invention, after forming a through hole that penetrates the bank structure and the rubble foundation and reaches the bottom of the bottom, a stirring rod is inserted into the bottom of the bottom through the through hole, and the tip of the stirring rod By improving the water bottom ground around the rod by injecting solidified material to the surroundings and stirring, ground subsidence due to weight increase of the whole breakwater structure can be prevented, and ground reaction force can be applied efficiently. .

  Furthermore, in the present invention, after forming the reinforcing base portion, a through hole is formed that penetrates the bank structure and the reinforcing base portion and reaches the bottom of the water, and a connecting member made of a steel rod or the like in the through hole. Is inserted between the inner surface of the through-hole and the connecting member, and the embankment structure and the rubble foundation are integrated, thereby causing a vertical reaction from the rubble foundation of the dam structure. As the force increases, the sliding resistance between the bank structure and the rubble foundation also increases. Moreover, by integrating the bank structure and the rubble foundation, the proof strength against the fall of the bank structure is also increased.

  Moreover, in this invention, a connection member can be suitably fixed to a bank structure by fixing the upper end part of the said connection member to a bank structure.

  As described above, the reinforced breakwater according to the present invention is a reinforced breakwater comprising a rubble foundation constructed by stacking stones on the bottom of the water, and a levee structure placed on the rubble foundation. Has a reinforced foundation formed by injecting and solidifying solidification material in the gaps between each stone under the bank structure, increasing the strength of the rubble foundation and stabilizing the bank structure on the rubble foundation It can be mounted in the state. Moreover, the weight of the whole breakwater structure increases by injecting the solidifying material, and the vertical reaction force received from the water bottom ground increases, and accordingly, the sliding resistance against the water bottom ground increases.

  Further, in the present invention, a through-hole penetrating the bank structure and the reinforcing base is provided, and a connecting member is inserted into the through-hole and a grout is filled between the through-hole and the connecting member. By integrating the bank structure and the rubble foundation, the vertical reaction force received from the rubble foundation of the bank structure is large, and accordingly, the sliding resistance between the bank structure and the rubble foundation is also large. Moreover, by integrating the bank structure and the rubble foundation, high proof strength against overturning of the bank structure can be obtained.

  Furthermore, in the present invention, the through hole reaches the water bottom ground below the reinforcing foundation, and the lower end of the connecting member is embedded in the water bottom ground, so that the through hole is high between the rubble foundation and the water bottom ground. Sliding resistance can be obtained, and high resistance against overturning of the entire breakwater can be obtained.

It is a longitudinal section showing an example of a reinforced breakwater concerning the present invention. It is a longitudinal cross-sectional view which shows the state of the breakwater before performing the reinforcement by the reinforcement method of the breakwater which concerns on this invention. It is a longitudinal cross-sectional view which shows the outline of the through-hole drilling process for solidification material injection | pouring same as the above. It is a longitudinal cross-sectional view which shows the outline of a reinforcement foundation part creation process same as the above. It is a longitudinal cross-sectional view which shows the outline of a through-hole drilling process same as the above. It is an enlarged longitudinal cross-sectional view which shows the outline of a ground improvement process same as the above. It is a longitudinal cross-sectional view which shows the outline of an integration process same as the above. It is a longitudinal cross-sectional view which shows another example of a reinforcement base part creation process.

  Next, an embodiment of the reinforced breakwater according to the present invention will be described based on the embodiment shown in FIG. In addition, the code | symbol A in a figure is a water bottom ground.

  This reinforced breakwater 1 is a hybrid levee comprising a rubble foundation 2 constructed on the submarine ground A and a dam structure 3 placed on the rubble foundation 2 so as to separate the inner sea from the outer sea. is set up. In the figure, the left side will be described as the inland sea and the right side will be described as the open sea through the breakwater 1.

  Further, the reinforced breakwater 1 is supported in a stable state with a lower surface supported by an improved ground layer 4 formed under the rubble foundation 2.

  The rubble foundation 2 is constructed by stacking a large number of stones 5, 5... On the water bottom ground A, and inclined portions 2 a and 2 a that are inclined toward the outer sea side and the inner sea side, respectively. It should be noted that the stone materials 5, 5... Constituting the rubble foundation 2 are different in size, shape, and the like, and a gap is formed between the stone materials 5, 5 by combining them.

  Further, the rubble foundation 2 is formed with a reinforcing foundation portion 6 below the bank structure 3. This reinforcing foundation 6 is formed by injecting and solidifying a solidified material 7 made of underwater non-separable concrete, cement mixture (cement milk, mortar) or the like in the gap between the stones 5, 5. As the strength increases, the overall weight increases, and the sliding resistance against the submarine ground A also increases.

  The reinforcing foundation 6 is formed wider than the width in the inward / outward direction of the bank structure 3.

  The bank structure 3 includes a concrete caisson 8 and a concrete upper concrete 9 that closes an upper surface portion of the caisson 8.

  The caisson 8 is formed in a box shape having a rectangular bottom plate 8a and a peripheral wall 8b having a shape rising from the periphery of the bottom plate 8a. The box-shaped interior includes a plurality of partitions 8c and 8c. Divided into rooms. Each inner chamber is filled with a filling material 10 made of sand, stone or the like.

  The reinforcing breakwater 1 is formed with a through hole 11 penetrating the bank structure 3 and the reinforcing foundation 6, and a connecting member 12 made of a steel rod or the like is connected to the bank structure 3 in the through hole 11. In addition, the grout 13 made of cement, mortar, synthetic resin material or the like is filled between the connecting member 12 and the inner peripheral surface of the through hole 11 while being inserted through the reinforcing base portion 6.

  The grout 13 is injected into the through-hole 11 at high pressure, and the connecting member 12 is firmly fixed to the bank structure 3 and the rubble foundation 2.

  Further, the upper end portion of the connecting member 12 is fixed to the upper surface portion of the upper concrete 9 by a fixing tool 14 such as a nut.

  In the reinforced breakwater 1 configured in this manner, the dam structure 3 is placed on the reinforced foundation 6 having high strength, and the dam structure 3 and the reinforcement foundation 6 (rubbing foundation 2) are connected via the connecting member 12. High proof strength against falling is obtained.

  Moreover, by integrating the rubble foundation 2 and the dam structure 3, the vertical upward reaction force that the dam structure 3 receives from the rubble foundation 2 increases, and the sliding resistance force of the dam structure 3 to the rubble foundation 2 increases. Is increased as compared to the case where they are not integrated.

  On the other hand, since the connecting member 12 reaches the bottom ground A below the rubble foundation 2, sliding of the entire dike with respect to the bottom ground A is also prevented.

  Moreover, by having the reinforcement base part 6 in which the solidification material 7 was inject | poured between the stone materials 5 and 5, compared with the case where it does not have the reinforcement base part 6, the weight of the breakwater 1 whole increases, and water bottom ground A accompanying it. Since the reaction force received from the tsunami increases, the sliding resistance of the entire breakwater against the water bottom ground A also increases.

  In addition, ground subsidence can be prevented by improving the water bottom ground A under the reinforcement foundation 6, and the reaction force received from the ground can be applied to the breakwater 1 without loss.

  Next, the breakwater reinforcing method according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned Example, and description is abbreviate | omitted.

  The breakwater shown in FIG. 2 is an existing breakwater, and is configured by placing a bank structure 3 on a rubble foundation 2.

  First, as shown in FIG. 3, the casing member 21 having the drilling bit 20 attached to the lower end is lowered from the upper surface of the upper concrete 9 while being rotated by an unillustrated excavator, and extends from the bank structure 3 to the rubble foundation 2. Then, a through hole 22 for injecting solidifying material is formed.

  This drilling operation is performed until the bottom of the rubble foundation 2 is reached while sequentially adding the casing member 21 so that the inner surface of the through hole 22 for solidifying material injection is covered with the casing member 21 so that the solidified material 7 described later does not leak out. To do. In the hole drilling operation, the working efficiency may be increased by using a high-pressure jet.

  Next, the surface of the inclined portion 2a of the rubble foundation 2 is covered with a sheet or plate material (not shown), the drilling bit 20 is pulled out through the through hole 22 for solidifying material injection, and solidified through the through hole 22 for solidifying material injection in that state. Material 7 is injected.

  As shown in FIG. 4, this solidifying material injection operation is performed by discharging the solidifying material 7 from the lower end of the casing member 21 while pulling out the casing member 21, so that the solidifying material 7 is passed through the through hole 22 for solidifying material injection. Flows into the gap between the surrounding stones 5, 5. In addition, the quantity of the solidification material 7 to inject | pour is determined based on conditions, such as the porosity in the rubble foundation 2, an injection | pouring range.

  This operation is performed up to the upper end portion of the rubble foundation 2, and the solidifying material 7 is cured and solidified, whereby the reinforcing foundation portion 6 is formed under the bank structure 3.

  Next, as shown in FIG. 5, the casing member 21 provided with the drilling bit 20 at the lower end is lowered while rotating again, penetrates the bank structure 3 and the reinforcing foundation 6, and below the reinforcing foundation 6. The through hole 11 is formed by drilling to a predetermined depth of the water bottom ground A.

  After the through hole 11 is formed, the drilling bit 20 and the casing member 21 are pulled out, and the stirring rod 23 is inserted into the water bottom ground A through the through hole 11 as shown in FIG.

  Then, the solidifying material 24 is jetted toward the surrounding earth and sand from the tip while rotating the stirring rod 23, whereby the earth and sand around the stirring rod 23 is stirred and the earth and solidifying material 24 are mixed. This work is performed while pulling up the stirring rod 23, and the improved ground layer 4 is formed under the reinforcing base portion 6.

  Next, as shown in FIG. 7, the connecting member 12 made of a steel rod or the like is passed through the through hole 11, and the bank structure 3 and the reinforcing foundation portion 6 are penetrated. Further, the lower end portion of the connecting member 12 is inserted and embedded in the improved ground layer 4.

  And after inject | pouring the grout 13 by the high voltage | pressure around the connection member 12 in the through-hole 11, this grout 13 is hardened and solidified.

  When the grout 13 is hardened, the connecting member 12 is firmly fixed to the bank structure 3 and the reinforcing foundation 6 (the rubble foundation 2) through the grout 13, and thereby the bank structure 3 through the connecting member 12. And the reinforcing base 6 are connected and integrated.

  Finally, the upper end portion of the connecting member 12 is fixed to the upper surface portion of the bank structure 3, that is, the upper surface portion of the upper concrete 9 by the fixing tool 14 such as a nut, and the operation is completed.

  In addition, although the above-mentioned Example demonstrated the example which performed the ground improvement of the water bottom ground A under the reinforcement foundation part 6, when the water bottom ground A is strong and does not need improvement, the above-mentioned ground improvement process is carried out. May be omitted.

  Further, as shown in FIG. 8, the solidification material 7 is injected between the stone materials 5, 5... By inserting the injection pipe 31 into the rubble foundation 2 obliquely downward from the work platform ship 30 and from the injection pipe 31. The solidifying material 7 may be injected.

A Submerged ground 1 Reinforced breakwater 2 Rubble foundation 3 Dike structure 4 Improved ground layer 5 Stone 6 Reinforced foundation 7 Solidified material 8 Caisson 9 Upper concrete 10 Filling material 11 Through hole 12 Connecting member 13 Grout 14 Fixing tool 20 For drilling Bit 21 Casing member 22 Solidification material injection through hole 23 Stirring rod 24 Solidification material

Claims (5)

In the method of reinforcing a breakwater, the embankment structure is placed on an existing rubble foundation constructed by stacking stones on a flat water floor, and the inland sea is separated from the outside sea .
Injecting a solidifying material between the stone materials constituting the existing rubble foundation, solidifying the solidified material, thereby forming a reinforcing foundation portion under the dam structure to increase the weight of the rubble foundation, And a through hole that penetrates the reinforcing foundation and reaches the bottom of the bottom, and a connecting member made of a steel rod or the like is inserted through the through hole, and then grouted between the inner surface of the through hole and the connecting member. The breakwater reinforcing method is characterized by integrating the bank structure and the rubble foundation on which the reinforcing foundation part is formed .   Use a casing member that is detachably provided with a drilling bit at the lower end, and while lowering the casing member, the casing member is lowered from the upper surface of the bank structure structure, and penetrates from the bank structure to the rubble foundation. A hole is formed and the inner surface of the through hole is covered with the casing member, and then the solidifying material is discharged between the stone members by discharging the solidifying material from the tip of the casing member while pulling out the casing member. The method for reinforcing a breakwater according to claim 1, wherein a slag is injected. After forming a through-hole that penetrates the bank structure and the rubble foundation and reaches the bottom of the ground, a stirring rod is inserted into the bottom of the bottom through the through-hole, and a solidified material around the tip of the stirring rod. The method of reinforcing a breakwater according to claim 1 or 2 , wherein the water bottom ground around the rod is improved by spraying and stirring. The method for reinforcing a breakwater according to any one of claims 1 to 3, wherein an upper end portion of the connecting member is fixed to the bank structure. The existing riprap foundation built by stacking the stone on a flat water bottom, e Bei a dam structure body placed on該捨stone foundation, in reinforcing breakwater consisting installed to separate the inland sea and open sea,
A reinforced foundation is formed by injecting and solidifying a solidifying material in a gap between each stone material of the existing rubble structure under the dam structure, and the rubble structure and the reinforced structure with the weight increased. A bank having a through hole penetrating over the foundation and reaching the bottom of the ground; a connecting member inserted through the through hole; and a grout filled between the through hole and the connecting member. A reinforced breakwater, characterized in that a body and a rubble foundation on which the reinforcing foundation portion is formed are integrated .

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