JPH0434114A - Method for expelling earth and sand in steel pipe sheet pile joint - Google Patents

Abstract

PURPOSE:To expel the earth and sand in a steel pipe sheet pile joint by penetrating the lower end of a water jet pipe blowing out a pressure water to the lower end in the joint while driving a vibrating pile driver in the state where a chucking plate is chucked. CONSTITUTION:To the upper end of a water jet pipe 4 to be connected to a high pressure hose 8 through a pipe joint 3 is welded and firmly fixed a chucking plate 7 possible to be chucked by the chuck 6 of a vibro hammer 5 as a vibrating pile driver. A pressure water W is supplied to the water jet pipe 4 through the high pressure hose 8, and its lower end is inserted into the joint 2 of a steep pipe sheet pile 1 while blowing out the pressure water W from its lower end. The vibro hammer 5 is driven to penetrate the water jet pipe 4 to the lower end in the joint 2. The earth and sand in the joint 2 thus overflow the upper part of the joint 2 together with water so as to be expelled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for removing earth and sand from a steel pipe sheet pile joint that can completely remove earth and sand from the joint of a steel pipe sheet pile that has been driven down to its lower end.

[Prior Art] Conventionally, as a commonly used steel pipe sheet pile, No. 2A shows a plan view in which each steel pipe sheet pile l is connected by a joint 2.
There are two types, such as the two-port type shown in the figure, the pipe T-type shown in Fig. 2B, and the pipe-type shown in Fig. 2C. Mortar is injected into the joint 2, but since earth and sand will enter the joint 2 when each steel pipe sheet pile 1 is placed, it is necessary to insert an air pipe or water jet pipe into the joint 2 before injecting the mortar. Earth and sand are removed from inside the joint 2.

However, the dirt that has entered the joint 2 is so dense that the air pipe or water jet pipe cannot penetrate to the lower end of the joint 2, making it impossible to completely remove the dirt. When injection was performed, there was a problem in that the water-stopping effect of the sheet pile wall could not be obtained.

[Problem B to be Solved by the Invention] The present invention has been made to solve the above-mentioned conventional problems, and is capable of completely eliminating earth and sand that has entered the joint up to the lower end of the joint. The problem to be solved was to provide a method for removing earth and sand from steel pipe sheet pile joints.

[Means to solve the problem]

As a means to solve the above problems, the method of removing earth and sand from a steel pipe sheet pile joint according to the present invention involves attaching a chucking plate firmly fixed to the upper end of a water jet pipe by welding or other appropriate means to a vibrating pile using a vibrohammer or other suitable means. While driving the vibrating pile driver while chucked with the chuck of the pile driving machine, connect the lower end of the water jet pipe, which is spouting pressurized water sent through a high-pressure hose, etc. to the lower end of the joint of the steel pipe sheet pile. The soil that has become dense inside the joint is loosened by pressurized water from the bottom end of the water jet pipe that is driven to the bottom by a vibrating pile driver, and overflows from the top of the joint together with the pressure water. and be excluded.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of one embodiment of an apparatus used for removing earth and sand from a joint according to the method of the present invention.

First, in this device, a chucking plate 7 that can be chucked with a chuck 6 of a vibro hammer 5, which is a vibratory pile driver, is welded to the upper end of a water jet pipe 4 connected to a high pressure hose 8 via a pipe joint 3. It is firmly fixed by other appropriate means.

Therefore, when using the above device to remove the earth and sand E that has entered the joint 2 of the steel pipe sheet pile 1 that has formed the sheet pile wall as shown in Figs. 2A, 2B, and 2C, as shown in Fig. 1,
Pressure water W is supplied to the water jet pipe 4 via a high pressure hose 8, and while jetting the pressure water W from the lower end, the lower end is inserted into the joint 2 of the steel pipe sheet pile 1, and the vibro hammer 5 is driven. As a result, the lower end of the water jet pipe 4 is penetrated into the joint 2 up to the vicinity of the lower end while being struck by the vibro hammer 5.

At this time, the earth and sand E that has entered the joint 2 is loosened by the high-pressure jet of pressure water W from the water jet pipe 4 and overflows from the upper part of the joint 2 together with water, so that the earth and sand E inside the joint 2 is completely excluded.

Once the water jet pipe 4 has penetrated to the lower end inside the joint 2, the water jet pipe 4 is pulled out and the process moves on to removing earth and sand from the next joint 2.

In the embodiment shown in FIG. 1, the water jet pipe 4 has a diameter of 2.5 inches, the chucking plate has a thickness of 12 inches, and the vibro hammer 5 has a diameter of 7 inches.
．． Although the one with a capacity of 5 KH is used, the above-mentioned dimensions should be selected as appropriate depending on the dimensions of the applied steel pipe sheet pile l, the driving depth, and other conditions.

〔Effect of the invention〕

According to the method for removing earth and sand from a steel pipe sheet pile joint of the present invention described above, the water jet pipe can be reliably penetrated to the lower end of the joint using a vibrating pile driver. This has the effect of reliably eliminating.

As a result, by completely removing the earth and sand in the joint and then injecting mortar into the joint, there is an effect that the water-stopping effect of the sheet pile wall made of steel pipe sheet piles is improved.

Further, the present invention has the advantage that a vibratory pile driver such as a vibrohammer used for driving steel pipe sheet piles can be used as is.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of a device used for removing earth and sand from joints by the method of the present invention, and Figs. 2A, 2B, and 2C are plan views of different general steel pipe sheet piles. It is. DESCRIPTION OF SYMBOLS 1... Steel pipe sheet pile, 2... Joint, 4... Water jet pipe, 5... Vibro hammer, 6... Chuck, 7... Chucking plate, W... Pressure water.

Claims (1)

[Claims] The chucking plate fixed to the upper end of the water jet pipe is chucked with the chuck of the vibrating pile driver, and while driving the vibrating pile driver, the lower end of the water jet pipe, which is spouting pressurized water, is attached to a steel pipe sheet pile joint. Method for removing earth and sand from steel pipe sheet pile joints that penetrate to the lower end of the pipe.