JP6450421B2 - Sheet pile placement method - Google Patents

Description

  The present invention relates to a technique for placing a sheet pile.

  In Patent Document 1, a driving jig to be mounted on the lower end of a sheet pile is disclosed. The jig includes a substantially isosceles triangular cutting edge head having substantially the same thickness as the sheet pile and having a lower end as an apex angle, and a pair of support pieces extending upward from both sides of the cutting edge head beyond the upper end. The lower end of the sheet pile is extrapolated between these support pieces, and the upper end surface of the cutting edge head is brought into contact with the lower end surface of the sheet pile so as to be detachably connectable.

Japanese Patent Laid-Open No. 10-252055

  If the jig attached to the lower end of the sheet pile is left in the ground after the sheet pile is placed, it is necessary to attach the jig to the sheet pile by the number of sheet piles, which takes a lot of work.

  In view of the above circumstances, the present invention provides a technique for reducing work when placing a sheet pile on the ground including an obstacle.

The present invention includes a first process of driving a sheet pile into a driving position, and determining whether or not there is an obstacle at the driving position based on a driving situation, and the driving position in the first process. When it is determined that there is an obstacle, the sheet pile is pulled out, and a crushing jig in which a member sharper than the lower end of the sheet pile is arranged at the lower end of the sheet pile having the same shape as the sheet pile is driven into the placement position. A second process of crushing the obstacle, a third process of pulling out the crushing jig driven into the driving position, and a fourth process of driving a sheet pile into the driving position In the first process and the fourth process, a sheet pile placing method using a sheet pile in which a member sharper than the lower end is not disposed at the lower end is proposed as a first aspect.

  ADVANTAGE OF THE INVENTION According to this invention, the operation | work at the time of driving a sheet pile in the ground containing an obstruction can be reduced.

Sectional drawing of the sheet pile 1. FIG. The figure which shows the member 2 for crushing. The figure which shows the jig | tool 3 for crushing. The flowchart which shows the procedure of construction of the sheet pile. The figure which shows the state of each process of construction. The figure which shows the state of each process of construction. The figure which shows the modification of the member 2 for crushing. The figure which shows the modification of the member 2 for crushing. The figure which shows the modification of the jig | tool 3 for crushing.

An example for carrying out the present invention will be described.
FIG. 1 is a cross-sectional view of the sheet pile 1. This embodiment shows an example in which the present invention is applied to a U-shaped steel sheet pile. The sheet pile 1 has a web 11, a flange 12, and a joint portion 13.

  FIG. 2 is a view showing a member (hereinafter referred to as a crushing member 2) arranged at the lower end of the sheet pile 1 in order to constitute the crushing jig 3. (A) is a side view. (B) is a side view in the A direction shown in (a). The first member 21 and the second member 22 are both steel plates. The crushing member 2 has an upper part of the first member 21 (a part extending from the upper end to a predetermined length shorter than the total height) and a lower part of the two second members 22 (a part extending from the lower end to a predetermined length shorter than the total height). It is sandwiched and joined. The joining method is preferably welding, but may be screwed. The lower end of the first member 21 is formed in a double-edged shape, and the lower end of the second member 22 is formed in a single-edged shape. The side surface of the second member 22 on the side not including the inclined surface of the single blade is joined to the first member 21. The thickness of the first member 21 may be the same as the web 11 of the sheet pile 1 or may be slightly thicker than the web 11 of the sheet pile 1.

  FIG. 3 is a view showing the crushing jig 3. (A) is the figure seen from the lower end side in the longitudinal direction. (B) is a side view of the B direction shown to (a). (C) is sectional drawing of CC cross section shown to (b). The lower end of the sheet pile 1 is disposed in the space between the two second members 22, and the two second members 22 are joined to the sheet pile 1. The joining method is preferably welding, but may be screwed. What is necessary is just to have the intensity | strength so that the member 2 for crushing may not remove | deviate from the sheet pile 1 when pulling out the jig | tool 3 for crushing driven into the ground.

  The crushing jig 3 is used for crushing an obstacle existing in the ground at the placement position of the sheet pile 1 or on the ground surface. An obstacle is an object that obstructs the driving of the sheet pile 1 and, for example, a foreign object (rubble, waste, etc.) and a relatively hard formation (such as a gravel layer) are assumed. From the viewpoint of work efficiency, it is desirable that the crushing jig 3 is prepared in advance separately from the normal sheet pile 1 before placing the sheet pile 1.

  FIG. 4 is a flowchart showing the construction procedure of the sheet pile 1. 5 and 6 are diagrams showing the state of each process of construction. This example is an example of a folding screen with three sheets as one set, and shows a state in which one set of sheet piles 1 is placed at a placement position adjacent to the existing set of sheet piles 1. There is an obstacle (shaded portion in FIGS. 5 and 6) at this placement position.

  First, a normal sheet pile 1 in which the crushing member 2 is not disposed is driven (step S01 in FIG. 4, FIG. 5A). Next, the state of driving the sheet pile 1 is observed to determine the presence or absence of an obstacle (step S02 in FIG. 4). If the sheet pile 1 is driven to the design depth, it is determined that there is no obstacle (step S02: NO), and the driving operation of the sheet pile 1 is finished. If the sheet pile 1 stops before reaching the design depth or if the driving is extremely slow, it is determined that there is an obstacle (step S02: YES), and the process proceeds to step S03.

  Next, the sheet pile 1 is pulled out (step S03 in FIG. 4, FIG. 5B). The drawn sheet pile 1 is stored in preparation for re-driving in step S06. Next, the crushing jig 3 is driven into the position where the sheet pile 1 has been pulled out, and the obstacle is crushed (step S04 in FIG. 4, FIG. 5C). Next, the crushing jig 3 is pulled out (step S05 in FIG. 4, FIG. 6A). The pulled-out crushing jig 3 is stored in case an obstacle is found at a subsequent placement position. Next, the sheet pile 1 is driven into the position where the crushing jig 3 has been pulled out (step S06 in FIG. 4, FIG. 6B).

  According to the present embodiment, since the crushing member is collected when the crushing jig is pulled out after crushing the obstacle, an operation of attaching the crushing member to the sheet pile every time an obstacle is found becomes unnecessary. Therefore, the operation | work at the time of placing a sheet pile in the ground containing an obstruction can be reduced.

  The above embodiment may be modified as follows. A plurality of modifications may be combined.

[Modification 1]
If the presence of an obstacle at the placement position is known, steps S01 to S03 in FIG. 4 may be omitted.

[Modification 2]
FIG. 7 is a view showing a modified example of the crushing member 2. (A) is an example using the 1st blade-like 1st member 21A. According to this configuration, since the common member is used for the first member 21A and the second member 22, the cost is suppressed. (B) is an example using the 2nd member 22B which is not single-edged. According to this structure, since a normal steel plate is used as the 2nd member 22B, cost is suppressed. (C) is an example using the 2nd member 22C whose lower end and upper end are single-edged. According to this configuration, the resistance when pulling out the crushing jig is reduced.

[Modification 3]
FIG. 8 is a view showing a modification of the crushing member 2. In this example, the first member 21D having a width wider than that of the second member 22 is used. According to this configuration, the crushing force is increased compared to the configuration in which the width of the first member 21 is the same as the width of the second member 22.

[Modification 4]
FIG. 9 is a view showing a modification of the crushing jig 3. In this example, a crushing member 2E is provided on the flange 12 in addition to the web 11 of the sheet pile 1. According to this structure, compared with the structure provided with the member 2 for crushing only in the web 11, crushing force is raised.

[Modification 5]
Only one second member 22 constituting the crushing member 2 may be used. The first member 21 may be joined to the sheet pile 1 without using the second member 22. In short, the crushing jig 3 may be any member in which a sharper member than the lower end of the sheet pile 1 is arranged at the lower end of the sheet pile 1.

[Modification 6]
The present invention may be applied to construction of any sheet pile such as a steel sheet pile, a steel pipe sheet pile, a concrete sheet pile, a resin sheet pile, and a wooden sheet pile having various cross-sectional shapes such as a hat shape, an I shape, a Z shape, and an H shape.

DESCRIPTION OF SYMBOLS 1 ... Sheet pile, 11 ... Web, 12 ... Flange, 13 ... Joint, 2 ... Crushing member, 21 ... 1st member, 22 ... 2nd member, 3 ... Crushing jig

Claims (1)

Implanted sheet pile in pouring position, the first process determines whether there is an obstacle the punching installation position based on the status of the implant,
When it is determined that there is an obstacle at the placement position in the first process ,
Second step of crushing the obstruction the sheet pile withdrawal, by implanting crushing jig placing the sharp member the lower end of the sheet pile to the lower end of sheet piles of the sheet pile and the same shape in the punching installation position When,
A third step of pulling out the crushing jig driven into the placement position;
A fourth process of placing a sheet pile at the placement position ,
A sheet pile driving method using a sheet pile in which a member sharper than the lower end is not disposed at the lower end in the first step and the fourth step.

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