JP2570599Y2 - Partition structure for continuous underground wall construction - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition wall structure for a continuous underground wall, in which positioning of a preceding excavation hole with respect to a joint end face is easy and pulling out after hardening concrete is easy.

[0002]

2. Description of the Related Art One of the construction methods of a continuous underground wall is a construction method using a partition plate. In this construction method, a partition plate is erected above the joint end face of a pair of excavated excavation holes, and concrete is cast to form respective antecedent elements.
After the concrete is hardened, the partition plate is pulled out to form a guide groove in the upper joint surface of the preceding element, and the joint end face of the preceding element is cut using an excavator such as a drum cutter type excavator using the groove as a guide. While the trailing hole is excavated, concrete is poured into the trailing hole while the trailing element is succeeded to the preceding element.

According to this construction method, since the upper width expanded by the groove is wider than the width of the excavated portion of the excavator, the excavator avoids the hard concrete constituting the preceding element, which is a so-called escape phenomenon. The initial excavation of the following excavation trench can be performed smoothly without
Subsequent cutting of the joint end face of the preceding element can also be performed accurately.

[0004]

In the case where the depth of the underground continuous wall may be relatively small, a small excavator is used to excavate a drilling hole for the preceding element which opens directly on the ground surface. The outer surface of the partition plate used at this time is in contact with earth and sand removed during excavation of the subsequent element and the outer surface is supported, so that the lateral pressure of concrete when the concrete is poured into the preceding element As a result, the position of the partition plate does not shift outward. In addition, since the partition plate used at this time is relatively small and lightweight, the operation of pulling out the partition plate is relatively simple.

However, when forming an underground continuous wall having a relatively large depth, it is necessary to use a large excavator. Since this large excavator has a minimum muddy water depth of several meters, it performs preliminary excavation using a bucket excavator or the like in advance to a width wider than the width of the drilling hole for the preceding element.
Next, it is necessary to drill a deep drill hole for the preceding element with a large drum cutter type excavator. In this case, the partition plate must be inserted from the ground surface into the opening of the excavation hole, and its size becomes longer and heavier. External force is required, and the pulling out work is troublesome and complicated.

Further, when the partition plate is built on the joint end face of the excavation hole, simply installing the girder provided on the upper portion of the partition plate at the top end of the excavation hole supports the upper outer surface of the partition plate. Since there is no concrete, the upper end of the partition plate is pressed by the concrete placing pressure toward the joint end face and moves, and there is a fear that the concrete cannot be placed with a desired accuracy.

The present invention solves the above-mentioned problems, and an object thereof is to provide a partition wall structure for a continuous underground wall which can be accurately positioned and fixed at the time of installing the partition plate and can be easily pulled out at the time of removal. It is.

[0008]

In order to achieve the above object, the present invention is directed to an installation girder installed at right angles to the upper ends of a pair of guide walls and a vertical descent below the installation girder. A partition plate main body having a predetermined thickness interposed in the cutting end surface above the excavation hole , and a frame above the installation girder.
A reaction receiving girder provided integrally with the partition plate main body, a pair of jacks for trimming interposed between the reaction receiving girder and the top end of the guide wall , and
And a pair of positioning and fixing jacks fixed downward and abutting against the side surface of the guide wall.

[0009]

According to the above construction, by driving the positioning and fixing jack with the partition plate disposed in the excavation hole, the partition plate main body is fixed and the position such as verticality is determined. When removing the partition plate, release the fixing of the positioning fixing jack and drive the rim cutting jack,
The whole rises and is cut off from the concrete, after which it can be easily removed from the element by a crane.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a partition plate 1 according to the present invention.
0 shows the state where it was arranged in the excavation hole. In the figure,
The partition plate 10 is composed of a combination of an H-section steel, an I-section steel, an L-section steel, and a thin steel sheet. An installation girder 16 installed orthogonally, and a partition plate body 20 having a predetermined thickness integrated by laminating steel plates 20a on both lower surfaces of three vertical frames 18 arranged orthogonally to the installation girder 16. A reaction force receiving girder 22 which is located above the installation girder 16 and is integrated with the upper end of the vertical frame 18; and both side portions of the reaction force receiving girder 22 and a top end of the guide wall 14. And a pair of jacks 24 for trimming interposed therebetween, and a reaction force receiving girder 26 below the installation girder 16 and integrated on the side surface of the frame 18, and is fixedly arranged on the left and right sides. Hit the side of the guide wall 14 And a pair of positioning and fixing jack 28.

The thickness of the partition plate body 20 is set by the cutting thickness of the joint end face of the preceding panel, which will be described later, and the depth to its lower end is determined by the top of concrete to be cast. The depth is set to be equal to or larger than the radius of the cutter drum in the excavator described later. Further, the partition plate body 20 is also covered with a steel plate on the surface that comes into contact with the hole wall side in order to prevent the casting of concrete into the back side, and the lower end 20b of the partition plate 20 is cut by a drum-type cutter. It is formed on an inclined surface to facilitate attachment.

A pair of suspending brackets 30 are integrated on the upper part of the reaction force receiving girder 22.
Is locked so that the partition plate 10 can be supplied to or removed from the excavation hole 12 by a crane operation.

Next, the continuous underground wall construction method using the partition plate 10 will be described with reference to FIG. First, as shown in (a), a partition plate 10 is suspended and arranged by a crane or the like above a joint end surface of a pair of preceding excavation holes 12 excavated, and an installation girder 16 is installed on a top end of a guide wall 14. When the positioning and fixing jacks 28 are driven, the tip of each positioning and fixing jack 28 is
, Respectively, to position the partition plate body 20 in the wall thickness direction, and to firmly fix the partition plate body 20 to this position.

After the partition plate body 20 is completely installed, a steel cage (not shown) is installed, and concrete is cast.
The leading element 32 is formed as shown in FIG. The partition plate 10 is pulled out after the concrete is appropriately hardened. At this time, when the fixing by the positioning and fixing jack 28 is released and the edging jack 24 is driven as shown by the arrow, the jack 24 becomes the reaction receiving girder 22. To raise the entire partition plate 10 including the partition plate body 20 to be cut off from concrete.

After the beveling, the bracket 3 of the reaction receiving girder 22
When the crane hook is locked at 0 and lifted by the crane, the partition plate 10 is removed.

After removal, a groove 32a corresponding to the thickness of the partition plate body 20 is formed on the joint end face of the leading element 32 as shown in FIG. Next, a drum cutter type excavator 34 is supplied between the preceding elements 32 as shown in (d) using the side groove portions 32a as guides, and the trailing excavation groove 36 is excavated. The splicing end face of the preceding element 32 below the groove 32a is cut by the cutter drum 34a of the excavator 34. Thereafter, a reinforcing bar is built inside the finished trailing excavation groove 36 and concrete is supplied, so that the trailing element 38 is connected to the preceding element 32 as shown in (e).

[0017]

As described in detail in the above embodiments, in the partition plate structure for continuous underground wall construction according to the present invention, the positioning fixing jack is driven with the partition plate arranged in the excavation hole. As a result, the partition plate main body is fixed and the verticality or the like is positioned, so that the partition plate can be accurately built without being affected by the concrete placing pressure or the accuracy of the hole wall. Also, when removing the partition plate, release the fixing of the positioning and fixing jacks and drive the edging jacks so that the whole will rise and be cut off from concrete, and then be separated from the element by a crane. Can be easily removed.

[Brief description of the drawings]

FIG. 1 is a front view of a partition plate according to the present invention.

FIG. 2 is a side view of the same.

FIGS. 3A to 3E are explanatory diagrams showing a construction procedure of a continuous underground wall construction method using the partition plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Partition plate 12 Leading drilling hole 14 Guide wall 16 Installation girder 20 Partition plate main body 22 Reaction force receiving girder 24 Edge cutting jack 28 Positioning and fixing jack

Claims (1)

(57) [Scope of request for utility model registration] An installation girder installed orthogonally above a pair of guide wall crests, and a partition having a predetermined thickness which is vertically installed below the installation girder and is interposed in a cutting end surface above an excavation hole. A plate body and a frame above the installation girder
And a reaction force receiving digits provided to be integrated with the partition plate main body, a pair of jacks for edge cutting interposed between the guide wall crest and reaction force receiving digits, digit for the installation
A continuous underground wall construction partition plate structure, comprising: a pair of positioning and fixing jacks fixedly disposed below and abutting against a side surface of the guide wall.