JPH041811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing an underwater continuous wall for constructing a concrete continuous wall underwater in the sea, river, or the like.

[Conventional technology]

The conventional construction method for underwater continuous walls is
-135625 is publicly known. In this known method, the nearly vertical side wall of an existing underwater structure is used as a guide, and the formwork for the trailing wall to be newly constructed is lowered into the water while being restrained and guided by the side wall. There is. Specifically, a joint member having a belly plate with flanges extending vertically on both sides and protrusions protruding from the belly plate at appropriate locations on the belly plate is embedded integrally with the preceding wall. The tip of the formwork for the trailing wall is guided and restrained by the flange and dropped into the mold.
The rear end of the formwork for the trailing wall is then closed with a coupling member similar to that described above. Then, the lower part of the formwork is erected by penetrating the remaining layer of the water bottom, and the ground on the water bottom below the formwork is excavated through the upper opening of the formwork to create a space of a predetermined depth. Concrete was poured into the space and formwork, and the post-construction wall was constructed by connecting it to the existing preceding wall.

[Problem to be solved by the invention]

However, in the construction method of underwater structures as described above, the joint members for guiding the formwork for the post-construction wall are buried integrally with the pre-construction wall and cannot be recovered and reused. It has become expensive and uneconomical.

The present invention was made in view of the above-mentioned problems, and its purpose is to use the formwork for the construction of the preceding wall as a guide when constructing the post-construction wall, and to use this formwork repeatedly. Therefore, it is an object of the present invention to provide a method for constructing an underwater continuous wall that reduces construction costs.

[Means to solve the problem]

In order to achieve the above object, according to the method for constructing an underwater continuous wall according to the present invention, first, second and third walls extending in the vertical direction are provided at the front and rear ends and the inner surface in the longitudinal direction.
Formworks each having a slide-type engagement portion are erected facing each other while appropriately penetrating into the water bottom in the longitudinal direction of the continuous wall constructed underwater, and the third slide-type engagement portion of the inner surface of the formwork is erected. engaging both ends of the removable first partition wall with the mold, replacing the water in the space surrounded by the formwork and the partition wall with muddy water, and digging into the bottom of the water below. A groove is formed and concrete is poured into the groove and the enclosed space to form a leading wall, and then the second wall is placed on the rear end side of the formwork used to form the leading wall. The first part on the front end side of the new formwork is attached to the sliding engagement part.
At the same time as engaging the engaging parts from above, a new formwork is erected facing each other while appropriately penetrating into the bottom of the water, and further, a new formwork is inserted into the third engaging part facing oppositely of the new formwork. the first partition wall used to form the preceding wall;
After removing the partition wall, the water in the space surrounded by the preceding wall, the new formwork, and the second partition wall is replaced with muddy water, and the bottom of the water below is dug. The process of forming a groove and pouring concrete into the groove and the enclosed space to construct a subsequent wall that is continuous with the preceding wall is repeated.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1, 2, and 4, reference numeral 1 indicates a temporary construction pier that has been assembled in advance underwater. The formwork 3 for the post-construction wall, which will be described later, is connected and engaged with the formwork 3' for the preceding wall 13, which is built adjacent to the temporary pier 1 and facing each other in the longitudinal direction of the continuous wall in the water 2. is built while penetrating into the water bottom 4 as appropriate. If necessary, the erected wall 3 may be installed opposite to the temporary pier 1 via beams (not shown) or the like in order to maintain uprightness.

Similarly, a partition wall 5, which will be described later and which partitions and engages between the formworks 3, is also erected while penetrating the water bottom 4 as appropriate.

As shown in FIGS. 3 and 5, the formwork 3 is a steel box-shaped casing-like formwork with a substantially elongated rectangular plane, and has two side plates and a vertical spacer arranged at an appropriate distance between the side plates. The main components are a plate 7 and a horizontal partition plate (not shown) disposed at an appropriate distance from the vertical partition plate 7 as necessary. At both ends of the formwork 3 in the longitudinal direction, an engaging hook-shaped portion and an engaging groove-shaped portion 9 are provided along the length direction, which can slide and engage with each other in the vertical direction. Further, inside each of the opposing formworks 3, a partition engagement groove portion 10 that can be slid vertically and engaged with a partition wall body 5, which will be described later, is provided so as to face the other formwork 3. It is installed along the horizontal direction. Furthermore, if a pointed end 11 is provided at the lower end of the formwork 3, penetration into the water bottom becomes easier.

The aforementioned partition wall body 5 is a steel plate-shaped frame, and has partition engaging hook-shaped portions 12 at both ends in the longitudinal direction.
are provided along the length direction so as to be able to slide in the vertical direction and engage with the partition engaging groove portion 10 of the formwork 3.

After erecting the formwork 3 facing the water bottom and the partition wall body 5 between the formworks 3, the preceding partition wall body 5' on the side of the preceding concrete 13 between the preceding formworks 3' is removed.

Then, the water in the surrounded area 14 between the opposing formworks 3 and between the preceding concrete 13 and the partition wall 5 that partitions and engages between the formworks 3 is replaced with muddy water.

Thereafter, the water bottom 4 below the surrounded portion 14 is dug to a predetermined depth using a continuous wall excavator (not shown) to form a groove 15. Next, this groove 1
5 and the surrounded portion 14, a reinforcing cage (not shown) is erected, and then concrete is poured using a tremie pipe (not shown).

In this way, one underwater unit wall 16 is constructed, and by sequentially repeating this operation, a continuous underwater wall 17 is integrally constructed from below the water bottom to above the water surface.

Although a plate-shaped partition wall 5 was used in this embodiment, if a box-shaped partition wall 5 is used instead as shown in FIG. 6, it becomes possible to wrap between the reinforcing bars, and the concrete The adhesion between the walls is improved, and the bond between the unit walls becomes stronger.

In addition, once the concrete poured between the previous formwork has hardened, this formwork can be removed as needed and used sequentially, so at least the underwater unit can be used as shown in Figures 1 and 2. This is possible by preparing formwork and partitions for only 3 to 4 walls.

〔effect〕

As described above, in the method for constructing an underwater continuous wall of the present invention, the formwork for constructing the preceding wall is used as a guide when constructing the subsequent wall, and this formwork can be used repeatedly, so it is economical. This is advantageous in terms of construction, etc.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the construction method of the underwater continuous wall according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is an enlarged plan view of part A in Fig. 1, and Fig. 4 is a plan view of the construction method of the underwater continuous wall according to the present invention. B-B
5 is a perspective view of the formwork, and FIG. 6 is a plan view showing another example of the partition wall. 3... Formwork, 3'... Preceding formwork, 5... Partition wall,
5'... Leading partition body, 8... Engaging hook-shaped part, 9... Engaging groove-shaped part, 10... Engaging groove-shaped part for partition, 12... Engaging hook-shaped part for partition, 13... Leading concrete, 14
...Enclosed part, 17...Underwater continuous wall.

Claims (1)

[Claims] 1. A formwork having first, second, and third slide-type engaging parts extending vertically on the front and rear ends and the inner surface of the longitudinal direction, respectively, is appropriately penetrated into the bottom of the continuous wall in the longitudinal direction to be constructed underwater. while facing each other, and engaging both ends of the removable first partition wall with the third sliding engagement portion on the inner surface of the formwork, so that the formwork and the partition wall are connected to each other. Then, the water in the enclosed space is replaced with muddy water, the bottom of the water is dug down to form a trench, concrete is poured into this trench and the enclosed space to form a leading wall, and then The first engaging part on the front end side of a new formwork is engaged from above with the second sliding engaging part on the rear end side of the formwork used when forming the preceding wall, and the new erect the formwork facing each other while appropriately penetrating into the bottom of the water, further engaging the new second partition wall body with the facing third engaging portion of the new formwork, and then , after removing the first partition wall used for forming the preceding wall,
The water in the space surrounded by the preceding wall, the new formwork, and the second partition wall is replaced with muddy water, and the bottom of the water below is dug to form a groove, and this groove and the above-mentioned A method for constructing an underwater continuous wall characterized by repeating the steps of placing concrete in an enclosed space to construct a trailing wall that is continuous with the leading wall.