JP3434007B2 - Diaphragm method and equipment used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall construction method and an apparatus used therefor.

[0002]

2. Description of the Related Art When connecting a preceding panel with a new panel, a connecting wall groove B for a new panel is excavated between the preceding panels A and A as shown in FIGS. Then, the earth and sand C adhere and remain on the edge portion of the preceding panel A. If a new panel is created with the sediment C remaining, the sediment serves as a passage for water, and the joint between the preceding panel A and the new panel becomes weak.

Therefore, it is necessary to remove the earth and sand C, but it is extremely difficult to accurately excavate the continuous wall groove B up to the end edge of the preceding panel A, because very high precision is required.

For this reason, as shown in FIGS. 7 and 8, the concrete cutters 3A and 3A additionally scrape off the edge d concrete d of the preceding panels A and A together with the ground D to form a continuous wall groove B2.

[0005]

However, the strength of concrete is improved and the strength is 300 kg / cm ^{2 as} compared with the conventional strength.
It is about 800 kg / cm ² or more, which is about three times as high.
Therefore, it takes time to cut the fillet, resulting in poor construction efficiency.

An object of the present invention is to provide a continuous wall construction method and apparatus for removing all the earth and sand adhering to the edge of the preceding panel without cutting concrete.

[0007]

According to the present invention, the preceding panel (A, A) is constructed in the preceding process, and the connecting wall groove (B) is excavated between the preceding panel (A, A). In the connecting wall construction method of constructing a connecting wall by placing a new panel in the connecting wall groove (B) in the process, in the preceding process, the connecting wall groove (B) is rotated inward by a pair of cutters. Leading panel (A,
Excavation is carried out leaving the earth and sand (C, C) adhering to the respective edge portions (a, a) of (A), and in the subsequent step, the muddy water in the wall groove (B) is sucked in to obtain a plurality of high-pressure jet nozzles (1).
1, 11) to remove the sediment (C, C) adhering to the edge of the jet, and the jet is jetted as a plurality of parallel high-pressure jets (PJ) and cross jets (CJ),
The intersecting jets (CJ) intersect at the corners (b) at the edges of the preceding panel.

Further, according to the present invention, it is used in a connecting wall construction method in which a preceding panel is constructed, a connecting wall groove is excavated between the preceding panels, and a new panel is placed in the connecting wall groove to construct a connecting wall. An apparatus, in which a frame suspended by a plurality of wires is provided with a pair of cutters that rotate inward with respect to each other, and the frame has an inlet for muddy water in a wall groove at an upper portion thereof. A high-pressure pump is provided, a nozzle head connected to the high-pressure pump is provided on both sides, and each nozzle head is provided with a plurality of high-pressure jet nozzles, except for the two nozzles described below. Are arranged so as to form parallel high-pressure jets, and the two nozzles are arranged so as to intersect the high-pressure jets at the corners of the edge of the preceding panel to form cross jets. I am trying.

[0009]

[0010]

[0011]

The nozzle head is preferably of the rotary type.

[0013]

[0014]

In the present invention, all of the earth and sand remaining on the preceding panel in the excavation process can be removed by the high pressure jet water in the removal process.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a pair of cutters 3 are rotatably supported inwardly on a frame 2 of an excavator generally designated by reference numeral 1, and the frame 2 is not shown by a plurality of wires 4. It is suspended by a crane.

Nozzle heads 10 are provided on both sides of the frame 2 via arms 5, respectively. The nozzle heads 10 and 10 are connected to a high-pressure pump 6 that is a supply source of the muddy water for high-pressure jet provided on the upper part of the frame 2, and the pump 6 has a suction port 7 for the muddy water in the groove. 7 is provided.

Referring also to FIG. 2, the nozzle head 10 includes
Multiple (two in the illustrated example) multiple (8 in the illustrated example)
Individual) high-pressure jet nozzles 11a to 11h (reference numeral 11 is used in the following generic name).

Of these nozzles 11, six nozzles 11
a to 11f are provided at equal intervals orthogonal to the edge portion a of the preceding panel A, and the remaining two pieces 11g and 11h are directed to the corner portion b of the edge portion a, respectively.

Therefore, the high-pressure jets J2 to J5 form the parallel high-pressure jet PJ, and the high-pressure jets J1 and J7 are formed.
And the high-pressure jets J6 and J8 form a cross jet CJ that intersects at the corner b.

Next, the manner of removing soil will be described.

In FIG. 1, the excavator 1 is suspended, the cutters 3 and 3 are rotated to excavate a continuous wall groove between the preceding panels A and A, and the earth and sand are cut off at the edge a of the preceding panels A and A. The excavation process in which C remains is the same as the conventional method.

Next, in the removal step following the excavation step, the high-pressure pump 6 sucks the muddy water in the connecting wall groove B (including the enlarged connecting wall groove B1 described later) from the suction ports 7, 7. The pressurized high-pressure jet nozzle 11 ejects the parallel high-pressure jet PJ as a cross jet CJ and removes all the earth and sand C adhering to the preceding panel A.

Here, the reason why the cross jet CJ is used is shown in FIG.
As shown in FIG. 7, when one outermost one of the parallel high-pressure jets PJ, for example, J1 slightly moves outward from the corner b of the preceding panel A, the high-pressure jet J1A that has been removed makes a hole E in the ground D. Therefore, at the same time as disturbing the back ground of the preceding panel A, the hole wall of the excavation groove B collapses and the quality of the connecting wall is impaired.

On the other hand, when the cross jet CJ is formed, for example, J1 and J7 are energy-cancelled and disappear after the confluence, and the drilling ability is lost.

On the other hand, since the muddy water in the connecting wall groove B1 is used as the high pressure jet water, it is possible to prevent the density of the slurry from decreasing. In addition, the industrial waste slurry will be reused.

FIG. 3 shows a nozzle head 10A according to another embodiment of the present invention, in which four high pressure jet nozzles J1, J6, J7 and J8 which form a cross jet CJ on the nozzle head 10A supported by a rotary arm 5A. High pressure jet nozzle 1
This is an example in which 1a, 11f, 11g, and 11h are provided. In this embodiment, the rotary arm 5A causes the nozzle head 10A to move.
Can be rotated to completely remove the earth and sand C attached to the preceding panel A by the two pairs of cross jets CJ.

[0028]

As described above, according to the present invention, it is possible to improve the construction efficiency and the quality of the connecting wall by removing all the earth and sand attached to the edge without cutting the concrete. .

Further, the slurry, which is an industrial waste, can be reused without changing the density of the slurry.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a top view showing the nozzle head of FIG.

FIG. 3 is a diagram corresponding to FIG. 2 of another embodiment of the present invention.

FIG. 4 is a drawing corresponding to FIG. 2 illustrating the reason for using a cross jet.

FIG. 5 is a vertical sectional view illustrating an example of a conventional method.

FIG. 6 is a horizontal sectional view of FIG.

FIG. 7 is a vertical sectional view for explaining another example of the conventional method.

FIG. 8 is a horizontal sectional view of FIG.

[Explanation of symbols]

A ... Leading panel B, B1, B2 ... Wall groove C ... earth and sand CJ ... Cross jet D: Ground E ... hole J1-J8 ... High-pressure jet PJ ・ ・ ・ Parallel high-pressure jet a ... edge b ... Corner 1 ... Excavator 2 ... frame 3 ... cutter 3A: Concrete cutter 4 ... Wire 5 ... Arm 5A ... Rotating arm Nozzle head 11a to 11h ... High-pressure jet nozzle

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 5/18 102-103 E02D 5/20 102-103

Claims (3)

(57) [Claims] 1. A preceding panel (A, A) is built in a preceding process, a connecting wall groove (B) is excavated between the preceding panels (A, A), and the connecting wall groove (B) is formed in a succeeding process. In the wall joint construction method in which a new panel is placed and a wall is constructed, in the preceding step, each of the front panel (A, A) is cut by a pair of cutters that rotate the wall groove (B) inward. Edge (a, a)
The earth and sand (C, C) adhering to the above are left to be excavated, and in the subsequent step, the muddy water in the connecting wall groove (B) is sucked in and ejected from the plurality of high pressure jet nozzles (11, 11) to attach the edge portions thereof. The accumulated sediment (C, C) is removed, and at that time, the jet is ejected as a plurality of parallel high-pressure jets (PJ) and a cross jet (CJ), and the cross jet (CJ) is a corner portion (b) of the edge of the preceding panel. ) Is a cross wall construction method. 2. A preceding panel (A, A) is built, a connecting wall groove (B) is excavated between the preceding panels (A, A), and a new panel is placed in the connecting wall groove (B). A device used in a wall construction method for constructing a wall, wherein a frame (2) suspended by a plurality of wires (4) is provided with a pair of cutters (3) that rotate inward relative to each other. The frame (2) is provided with a high-pressure pump (6) having a muddy water suction port (7) in the communicating wall groove (B) at the upper part, and is connected to the high-pressure pump (6) on both sides. Nozzle heads (10, 10) are provided, and each nozzle head (10) is provided with a plurality of high-pressure jet nozzles (11), except for two of the nozzles (11) described below. The two nozzles (11g, 11h) are arranged so as to form a parallel high pressure jet (PJ). A device used for a continuous wall construction method, which is arranged so as to intersect with the high-pressure jet (PJ) at a corner (b) of an edge of the preceding panel to form a cross jet (CJ). 3. An apparatus used in a wall construction method according to claim 2, wherein the nozzle head (10A) is a rotary type.