JPS627329B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing a continuous wall underwater, and in particular, a method of constructing a wall plate using reference piles erected underwater as a guide, and The water in the space surrounded by the wall and the wall board was expelled and the bottom of the water was dug down, and here,
Concrete will be poured to create a continuous underwater wall.

[Conventional example] Conventional construction work for constructing continuous walls over water involves first creating artificial ground by reclaiming land, and then building continuous walls on top of this artificial ground.

[Problem that the invention seeks to solve]

However, according to this method, the reclamation work to create the artificial ground takes time, effort, and cost, and work to prevent the reclaimed layer from collapsing is required, which is troublesome. When using it for the foundations of bridge piers, etc., the reclaimed layer had to be removed again, which was a huge waste in terms of process and cost.

This invention solves the problems of the conventional methods, and its purpose is to provide a construction method that does not require reclamation work when constructing a continuous wall underwater; It is an object of the present invention to provide a method for easily constructing an underwater continuous wall, and a further object of the present invention is to provide a method for constructing an underwater continuous wall that can significantly reduce construction period, labor, and cost.

[Means and actions for solving problems]

That is, in this invention, reference piles having guides on both sides in the thickness direction of a continuous wall are erected in water at appropriate intervals, and while the left and right ends are engaged and guided by the guides of the two reference piles, two Two wall plates are erected between the two standard piles, and while these two wall plates are properly penetrated into the ground, the water between the wall plates is removed by replacing it with muddy water, etc. By digging down the bottom of the water between the plates to form a groove, pouring concrete into this groove and the area surrounded by the two wall plates and two reference piles, and allowing it to harden. Directly connect the two reference piles with concrete of a specified thickness,
The present invention relates to a method for constructing a continuous wall underwater, characterized in that the wall plate is removed after the concrete has hardened.

〔effect〕

In this invention, a wall plate is erected using reference piles erected in the water as guides, water is expelled from the space surrounded by the reference piles and the wall plate body, the bottom of the water is dug down, and concrete is placed here. Since the wall plate is cast to form a continuous wall underwater, the wall board blocks the outside from the parts that make up the element, and prevents the trench from collapsing due to the muddy pressure itself and the muddy water pressure held by it. do. Therefore, the main work of constructing an underwater continuous wall can be accomplished by the simple work of trenching and lowering. Therefore, according to the present invention, a continuous wall underwater can be formed easily and at low cost.

In particular, in this invention, since two wall plates facing each other are installed between two reference piles, the concrete placed between them hardens in direct contact with the reference piles. For this reason, the wall formed of poured concrete is integrally connected to the reference piles at both ends without the need for any special construction work, and an underground continuous wall is completed as is. Furthermore, in this invention, since the wall is constructed between two reference piles, by erecting a large number of reference piles at predetermined intervals, construction can be carried out in parallel at each interval between the reference piles. be able to. For this reason, excavators,
In addition to being able to perform construction efficiently without leaving concrete placing machines, cranes, etc. idle, by erecting reference piles with precision, the wall between them only needs to be constructed in line with the reference piles. This has the effect of easily ensuring the accuracy of wall construction.

〔Example〕

As shown in FIG. 1, first, cylindrical stand pipes 6 are embedded in the ground B at the bottom of the water at regular intervals. A known vibrohammer (not shown) or the like is used for this work.

After replacing the water (seawater) in this standpipe 6 with muddy water, a reverse circulation drill (not shown) is set in this standpipe 6, and thereby a reference hole is drilled at a predetermined depth. 7 is excavated. A reference pile 2 made of H-shaped steel is erected in this. The H-shaped steel used here has a flange 2a
However, the H-shaped steel flange 2a of the reference pile 2 in the other stand pipe 6 provided at a constant interval from this
It is built to face the. The structure of the H-shaped steel may be a simple H-shaped steel, but here, as shown in the figure, a structure in which there are two connecting plates 2b connecting the flanges 2a is adopted. Second
The figure clearly shows the above situation. As seen in FIG. 2, a sheet 8 is attached to the outside of the flange 2a, leaving the tip of the flange, and the reference hole 7
A partitioned space is formed with the inner circumferential surface of. And the third
As shown in the figure, the space defined by the sheet 8, the side surface of the flange 2a, and the inner peripheral surface of the reference hole 7 and the reference pile 2
Concrete shown with diagonal lines is poured into the hollow part of the
The space defined by the flange 2a, the connecting plate 2b, and the inner peripheral surface of the reference hole 7 is filled with gravel or silt mortar to fix the reference pile 2 in the reference hole 7. In this case, the muddy water may solidify as it is. After burning, the standpipe 6 is removed. This situation is shown in FIG.

Next, as shown in Figures 5 and 6, the reference pile 2,
A concave portion 9 that engages with the two sets of opposing flanges 2a, 2a as a guide 1 to sandwich them.
Two wall panels 3 having the same structure are installed while being guided so as to face each other. This wall plate body 3 is embedded in the water bottom B using a vibrohammer (not shown) or the like.
In particular, as shown in FIG. 6, at the lower end of the wall board 3,
It is also possible to pour concrete using a pouring pipe (not shown) attached to the wall plate 3 to stop water.

In this way, the water in the space surrounded by the reference pile 2 and the wall plate body 3 is replaced by muddy water. After burning, trenches 4 are excavated between the wall panels 3 to a predetermined depth using a continuous underground wall excavator shown at 10 in FIG. After the trench 4 is excavated to a predetermined depth, a reinforcing bar cage 11 is erected as shown in FIG. 9, and then concrete 5 is poured using a tremie pipe (not shown).

After the concrete 5 has solidified, if necessary, it is removed by pulling the wall plate 3 upward.

In this way, an underwater wall of one element is formed between the reference piles 2 and 2, but by repeating this process one by one to connect a predetermined number of elements, a continuous underwater wall of the required length is created under the water. Built to stand up more.

According to this embodiment, it is possible to construct a continuous wall directly underwater so that it rises from below the water bed without prior reclamation work.

Therefore, the construction method is extremely simple and can be greatly improved in terms of construction period, labor, and cost.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the standard pile erection process, Figure 2 is a plan view of the same, Figure 3 is a cross-sectional view showing the standard pile fixed in the standard hole, and Figure 4 is a vertical cross-sectional view of the same. ,
Figure 5 is a partial plan view of the wall plate engaged with the reference pile;
Fig. 6 is a longitudinal sectional view of the same, Fig. 7 is a plan view of the trench excavated, Fig. 8 is a longitudinal sectional view of the same, and Fig. 9 is a partially cutaway plan view of the concrete poured state.
In the figure, 1 is a guide, 2 is a reference pile, 3 is a wall board, 4 is a groove, 5 is concrete, 9 is a concave portion, and 2a is a flange.

Claims (1)

[Scope of Claims] 1. Reference piles having guides on both sides in the thickness direction of a continuous wall are erected in water at appropriate intervals, and the guides of the two reference piles engage and guide the left and right ends while facing each other. Two wall plates are erected between the two reference piles, and the water between the wall plates is removed by replacing it with muddy water while the two wall plates are properly penetrated into the ground. The bottom of the water between the wall panels is dug down to form a groove,
Concrete is placed in this groove and in the area surrounded by the two wall plates and the two reference piles, and by hardening it, the two reference piles are directly connected with concrete of a predetermined thickness, A method for constructing a continuous wall underwater, the method comprising removing the wall plate after the concrete has hardened. 2. The guide of the reference pile is made of a flange portion of H-beam steel, and the left and right ends of the wall plate are concave portions sandwiching the flange, as described in claim 1. How to build.