JPS6119775B2 - - Google Patents

Description

Detailed Description of the Invention The present application relates to a method for driving support piles to support the foundation part when forming the lower part of the foundation of a structure. Usually, the support piles are placed long above the point where the foundation is to be formed. The concrete is poured until the ground is stable, and after excavating the foundation, the piles protruding from the top are crushed to expose the reinforcing bars, etc., and a foundation concrete layer is provided. The construction time and cost of crushing the material is also significant.

Therefore, if the pile is driven to a predetermined depth in order to eliminate the part that corresponds to the part to be crushed, earth, sand, muddy water, etc. will enter the inside through the opening at the top of the pile, and the specified measurement of the pile (pile length, pile This has disadvantages such as the inability to observe internal abnormalities.

The present application was invented in view of these drawbacks, and to describe an embodiment thereof, a lower cylinder 2a having a diameter larger than the outer diameter D of the driven pile 1 is formed, and the length (height) of the lower cylinder 2a is h. can fully fit the driven pile 1, and the vibration caused by driving the driven pile 1 from above with a driving hammer
The length is such that the lower cylinder 2a does not separate from the lower cylinder 2a (a length that does not come out), and the lower cylinder 2a is attached to the upper part of the lower cylinder 2a.
A partition member 3 having the same diameter as the outer diameter of the cylinder a is fixed, and an upper cylinder 2b having a slightly smaller diameter (or the same diameter) than the lower cylinder 2a and the partition member 3 is fixed to the upper part of the partition member 3 to form the cylinder 2. A closing plate 5 is fixed to the upper end of the upper cylinder 2b to close the upper cylinder 2b. A cushion material 6 is inserted into the inner surface of the upper end of the lower cylinder 2a.

A hollow annular sealing material 7 such as an endless tube seal is installed inside the lower cylinder 2a around the entire circumference between the lower surface of the cushion material 6 and the lower end portion l' of the lower cylinder 2a.

The annular sealing material 7 is hollow and can be expanded by pressurizing a fluid such as air into the annular sealing material 7. One end of the fluid injection pipe 7a is connected to and opened at one place in the upper part of the annular sealing material 7. The end protrudes into the upper cylinder 2b through holes 9 made in the cushion material 6, horizontal partition material 3, etc. as appropriate, and the other end of the fluid press fitting pipe 7a is opened and protruded from the side surface of the upper cylinder 2b, and a valve is attached to the end. 8 is provided.

Furthermore, an insertion hole 11 for a weight 10 for air venting and for measuring pile length is bored in the center of the horizontal partition member 3 and the cushion member 6 in the vertical direction. A guide 13 such as a pipe or a rotor is provided so that the hanging wire 12 of the pile length measuring weight 10 is vertical when the pile length measuring weight 10 is hung at an appropriate location inside the upper cylinder 2b. Furthermore, a hole 14 for pulling out the hanging wire 12 is bored in the side of the upper cylinder 2b. It is appropriate that the hole 14 be at approximately the same height as the guide 13, but other design and
The hole 14 may be bored at an appropriate location depending on the circumstances of the pouring machine, etc., and the hole 14 can also be used as an air vent to form the pouring auxiliary cylinder 4.

In the present application, piles are driven using the driving auxiliary tube 4 as described above, but to explain an example thereof, the first driving pile 1 is driven as shown in FIG. (See Figure 3 A), connect the next driving pile 1 while the upper end is protruding above the ground, and then drive the second and first driving pile 1 (see Figure 3 B). , After that, repeat this craft one by one until the lowest driving pile 1
Before reaching the stable ground 16, the lower cylinder 2a of the driving auxiliary cylinder 4 is fitted to the outer periphery of the driving pile 1 at the upper end of the driving pile 1 protruding above the ground (see Fig. 3 C). After press-fitting a fluid such as air into the sealing material 7 and keeping it airtight between the inside of the lower cylinder 2a and the outside of the driving pile 1 (see Fig. 1), the pile is driven from the upper part of the driving auxiliary cylinder 4. The driving auxiliary cylinder 4 is driven into the driving pile 1 to a predetermined depth using a hammer 15 or the like (see FIG. 3D).
Thereafter, the pile length measuring weight 10 suspended from the guide 13 in the upper cylinder 2b is lowered into the driven pile 1 by extending the hanging wire 12 to measure the actual length of the driven pile. It is something. In this case, if there is an abnormality in the pile and water and sediment are flowing into the pile body from the tip of the pile, a device with a slime detection function attached to the weight can be used to separate the water level and the level of the inflowing sediment. This method is more effective in detecting abnormalities in piles.

After that, the pile length measuring weight 10 is pulled up into the lower cylinder 2a or the upper cylinder 2b, the fluid in the sealing material 7 is removed, a gap is created between the driving pile 1 and the lower cylinder 2a, and the driving auxiliary cylinder 4 is driven. It is removed from the upper end of pile 1 to begin the next driving work.

17 indicates a rib.

The driving auxiliary cylinder 4 also serves to prevent the driving pile 1 from being broken due to the air pressure within the driving pile 1 when the holes 11 and 14 are not bored.

In this application, the first driving pile was driven as described above,
The next driven pile is connected and driven while the upper end is protruding above the ground, and this method is repeated one after another, until the lowest driven pile protrudes above the ground before the lowest driven pile reaches stable ground Fit the lower cylinder of the driving auxiliary cylinder, which has a measuring weight inside at the upper end, to the outer periphery of the driving pile, press it into the fluid sealing material such as air through the valve, and drive it into the inside of the lower cylinder. After keeping the space between the outsides of the pile airtight, use a driving hammer etc. to drive the driving auxiliary cylinder to the specified depth from the top of the driving auxiliary cylinder, and then remove the suspended measuring weight. Stretch out the hanging wire and lower it inside the driven pile to measure the actual length of the driven pile, the water level or the level of inflowing earth and sand, and then place the weight for measuring the pile length inside the lower cylinder or upper cylinder. This method is characterized by removing the sealing fluid from the sealant, creating a gap between the driven pile and the lower cylinder, and removing the driving auxiliary cylinder from the upper end of the driven pile. Since there is no need to break the pile head, subsequent crushing work on the pile head can be omitted, and the condition of the bottom end of the pile (slime, earth and sand, water volume, etc.) can be known, as well as ensuring that the pile reaches stable ground. It is possible to reliably know whether or not the pile has been driven, the length of the pile that has been driven, and the state of damage to the lower end of the pile.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a pouring auxiliary tube for implementing the construction method of the present application, Figure 2 is a plan view of the same, Figure 3 A, B,
C and D are explanatory cross-sectional views showing the wishes of the pile driving method;
FIG. 4 is a sectional view of the lower part of the driven pile when it is stopped.

Claims (1)

[Claims] 1. Driving the first driving pile, and connecting and driving the next driving pile while its upper end is protruding above the ground,
This method is repeated one after another, and before the lowest driven pile reaches stable ground, the lower cylinder of the driving auxiliary cylinder with a measuring weight installed inside is driven into the upper end of the driven pile protruding above the ground. After fitting to the outer circumference of the pile and pressurizing fluid such as air into the sealing material through a valve to maintain an airtight space between the inside of the lower cylinder and the outside of the driving pile, a driving hammer or the like is inserted from the top of the driving auxiliary cylinder. Driving a driving auxiliary tube to the specified depth of the driven pile, then lowering the suspended measuring weight into the inside of the driven pile by extending the hanging wire and measuring the actual length of the driven pile. Alternatively, measure the level of inflowing earth and sand, pull the pile length measuring weight into the lower cylinder or upper cylinder after measurement, drain the fluid from the sealant, and create a gap between the driven pile and the lower cylinder. A driven pile construction method characterized by removing the installation support tube from the upper end of the driven pile.