JPH09151432A - Existing revetment structure reinforcing construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction space by constructing deformed underground continuous wall elements of high rigidity and high bearing force as guy pins behind an existing revetment structure, and connecting the underground continuous wall elements and the existing revetment structure by tie rods. SOLUTION: A T-shaped underground continuous wall element 3 is constructed behind each joint part 1a of a plurality of revetment caissons provided in a row with joint parts 1a interposed, in such a way that a flange 3a is parallel with an existing revetment structure 2 and that a web 3b is opposed to the joint part 1a. The upper end part near the joint part 1a of the revetment caisson 1, and the upper end part of the underground continuous wall element 3 are connected by two tie rods 4 piercing almost the center of the flange 3a and web 3b. The member size, reinforcement quantity, flange width, depth, and the like of the underground continuous elements 3 are set so as to correspond to necessary flexural rigidity and bearing force according to the state of a site. The number of the underground continuous wall elements 3 can thereby be reduced, and the total construction space can be reduced by a large margin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing an existing revetment structure such as a revetment caisson for protecting coasts such as rivers and the sea.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing an existing revetment structure, for example, as shown in FIG.
Behind 1 is a pile 32 such as a steel pile, steel pipe pile or sheet pile.
7 to connect the retaining piles 32 and the existing revetment structure 31 with a tie rod 33, or as shown in FIG. 7, a concrete frame 35 is provided behind the existing revetment structure 34.
A construction method is known in which the concrete frame 35 and the existing revetment structure 34 are connected by a tie rod 36.

[0003]

However, among the conventional methods for reinforcing existing revetment structures, the method using steel piles such as steel piles has a high Young's modulus of the piles, but has a large size. In terms of points, only those with a small bending rigidity can be obtained,
There is a problem in that the number must be increased in order to prevent a decrease in the reinforcing effect. In addition, in both cases of using piles and concrete skeleton, depending on the number of piles and the size of concrete skeleton, a considerable construction space is required to secure a work area for heavy equipment. There is. Then, this invention aims at providing the reinforcement construction method of the existing revetment structure which can reduce the number of piles and can also reduce the construction space.

[0004]

In order to solve the above-mentioned problems, the reinforcing construction method for an existing revetment structure of the present invention is to construct an irregular underground continuous wall element behind the existing revetment structure, The continuous wall element and the existing revetment structure are connected by a tie rod. The existing revetment structure is preferably a revetment caisson or revetment block. It is preferable that the irregularly shaped underground continuous wall element is T-shaped or cruciform. Further, it is preferable that the irregular shaped underground continuous wall element is constructed behind the joint portion of the existing revetment structure.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a sectional view and a plan view showing a first embodiment of a method for reinforcing an existing revetment structure according to the present invention. In this construction method, first, behind the joint portion 1a of the adjacent revetment caisson 1 in the existing revetment structure 2 composed of a plurality of revetment caisson 1 that are lined up with the joint portion 1a interposed (left in FIG. 1). First, the T-shaped underground continuous wall element 3 is constructed so that the flange 3a is parallel to the existing seawall structure 2 and the web 3b faces the joint portion 1a. T-shaped underground continuous wall element 3
Serves as a retaining pile (retaining pile) that prevents the existing revetment structure 1 from moving, and the member size, reinforcing bar amount, flange width, etc. are arbitrarily set according to the required bending rigidity and proof strength. . Next, the joint part 1a of the adjacent seawall caisson 1
The upper end of the vicinity and the upper end of the underground continuous wall element 3,
This is a construction method in which two tie rods 4 that penetrate substantially the center of the flange 3a and the web 3b are connected.

In the method of reinforcing the existing revetment structure,
A single underground continuous wall element 3 that functions as a pile
Since it can be constructed as one having high rigidity and high proof strength according to the local situation, the number can be reduced and the total construction space can be greatly reduced.

FIG. 3 is a plan view of essential parts showing a second embodiment of a reinforcing method for an existing revetment structure according to the present invention. In this construction method, when the seawall caisson as an existing seawall structure is large and / or constrained by the construction space or the size of the underground continuous wall element, first, a flange is formed behind a single seawall caisson (not shown). A plurality of underground continuous wall elements 5 each having a T-shape composed of 5a and a web 5b, in which the web 5b faces the revetment caisson at a right angle,
Next, each of the upper ends of the seawall caisson and each underground continuous wall element passes through the center of the flange 5a and the web 5b.
This is a construction method in which tie rods 6 of a book are continuous. The method of reinforcing the existing revetment structure has substantially the same operational effect as the method of construction of the first embodiment.

FIG. 4 is a plan view of essential parts showing a third embodiment of a method for reinforcing an existing revetment structure according to the present invention. This construction method is similar to the construction method of the first embodiment, first of all, a flange 7a and a web are provided behind an existing revetment structure (not shown) composed of a plurality of revetment caissons arranged in rows with joints interposed. The T-shaped underground continuous wall element 7 consisting of 7b,
The flanges 7a are constructed so as to face each other in parallel to the joints, and then the upper end of the adjacent seawall caisson near the joints and the upper end of the underground continuous wall element 7 are passed through both ends of the flange 7a. This is a construction method in which two tie rods 8 are connected. The method of reinforcing the existing revetment structure has substantially the same operational effect as the method of construction of the first embodiment.

FIG. 5 is a plan view of essential parts showing a fourth embodiment of a method for reinforcing an existing revetment structure according to the present invention. This construction method is similar to the construction method of the first embodiment. First, two flanges 9 are provided behind an existing revetment structure (not shown) consisting of a plurality of revetment caissons arranged in rows with joints interposed.
A cross-shaped underground continuous wall element 9 in which a and 9b intersect at a right angle is constructed such that one flange 9a faces the joint in parallel, and then the upper end near the joint of the adjacent seawall caisson. And the underground continuous wall element 9 and the upper end portion are connected by two tie rods 10 that penetrate both end portions of the one flange 9a. The method of reinforcing the existing protection structure has substantially the same operational effects as the method of construction of the first embodiment.

In each of the above-mentioned embodiments,
The case where the existing revetment structure is constructed by arranging a plurality of revetment caissons in a row has been described, but the present invention is not limited to this. An existing revetment structure composed of a plurality of revetment blocks arranged in a row with joints It may be a thing.

[0011]

As described above, according to the method for reinforcing an existing revetment structure of the present invention, a single underground continuous wall element that functions as a pile is provided with a shape, size, and
Since it can be constructed with high rigidity and high proof strength by changing the depth etc., the number can be reduced compared to the conventional construction method, and the total construction space can be greatly reduced. .

[Brief description of the drawings]

FIG. 1 is a first method for reinforcing an existing seawall structure according to the present invention.
3 is a cross-sectional view showing the embodiment of FIG.

FIG. 2 is a first method for reinforcing an existing revetment structure according to the present invention.
It is a top view which shows embodiment.

FIG. 3 is a second reinforcement method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

FIG. 4 is a third reinforcing method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

FIG. 5 is a fourth reinforcing method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

[Explanation of symbols]

 1 Revetment caisson 1a Joint part 2 Existing revetment structure 3 Underground continuous wall element 4 Tie rod 5 Underground continuous wall element 6 Tie rod 7 Underground continuous wall element 8 Tie rod 9 Underground continuous wall element 10 Tie rod

[Procedure amendment]

[Submission date] March 6, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Added

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a first method for reinforcing an existing seawall structure according to the present invention.
3 is a cross-sectional view showing the embodiment of FIG.

FIG. 2 is a first method for reinforcing an existing revetment structure according to the present invention.
It is a top view which shows embodiment.

FIG. 3 is a second reinforcement method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

FIG. 4 is a third reinforcing method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

FIG. 5 is a fourth reinforcing method for an existing revetment structure according to the present invention.
FIG. 3 is a plan view of a main part showing the embodiment of FIG.

FIG. 6 shows an example of a conventional reinforcing method for an existing revetment structure.
It is sectional drawing.

[Fig. 7] Fig. 7 shows another example of a conventional reinforcing method for an existing revetment structure.
FIG.

[Explanation of symbols] 1 Revetment caisson 1a Joint part 2 Existing revetment structure 3 Underground continuous wall element 4 Tie rod 5 Underground continuous wall element 6 Tie rod 7 Underground continuous wall element 8 Tie rod 9 Underground continuous wall element 10 Tie rod

Claims (4)

[Claims] 1. An existing revetment structure characterized in that a deformed underground continuous wall element is constructed behind an existing revetment structure, and the deformed underground continuous wall element and the existing revetment structure are connected by tie rods. Reinforcement method. 2. The method for reinforcing an existing revetment structure according to claim 1, wherein the existing revetment structure is a revetment caisson or a revetment block. 3. The deformed underground continuous wall element is T
It is a character shape or a cross shape, The claim 1 or 2 characterized by the above-mentioned.
Reinforcement method of the existing revetment structure described. 4. The method of reinforcing an existing revetment structure according to claim 1, 2 or 3, characterized in that the irregular shaped underground continuous wall element is constructed behind a joint portion of the existing revetment structure.