JPS6224576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to members that are used for civil engineering foundation work, such as steel sheet piles, steel pipe piles, and concrete piles, and are driven into the ground.

A commonly used method for driving an existing driving member for civil engineering foundation work, such as a steel sheet pile, into the soil by vibrating it in its axial direction is a method using a vibratory hammer, that is, a vibration driving method.

FIG. 1 is an explanatory diagram of this vibration driving method.
In this method, a vibrohammer 1 suspended by a crane (not shown) vibrates the steel sheet pile 2 in its axial direction, reducing frictional resistance around the steel sheet pile 2, and The strength of the nearby soil is lowered and the steel sheet pile 2 is made to sink due to the weight of the vibro hammer 1 and the steel sheet pile 2.

Compared to various other methods such as press-fitting, this vibration driving method has the advantage of using a simple device and requiring less construction costs, so it is widely practiced, but it also has the following problems. It is a point. In other words, the vibration driving method is effective for sandy ground, but it is not sufficient for hard viscous ground with an N value of 30 or more because the frictional resistance of the soil around the steel sheet pile 2 is large. No amplitude is generated, and therefore the strength of the soil at the tip of the steel sheet pile 2 cannot be sufficiently reduced, making driving the steel sheet pile 2 difficult and low in efficiency. In addition, the ground vibration caused by driving is large, and construction near private houses is restricted.

That is, the energy of the vibration generated by the vibratory hammer 1 is used to vibrate the steel sheet pile 2 against the frictional resistance of the soil, and to reduce the strength of the ground at the tip of the steel sheet pile 2 and destroy the ground. Ru. Therefore, when the frictional resistance of the soil is large, the energy of the vibration of the vibrohammer 1 is not sufficiently transmitted to the tip of the steel sheet pile 2, and the strength of the ground at the tip of the steel sheet pile 2 is not reduced sufficiently, which reduces driving efficiency. decreases. In addition, when the frictional resistance of the soil is large, the ground around the steel sheet pile 2 vibrates together with the steel sheet pile 2, so the ground vibration becomes large.

Therefore, in order to reduce the frictional resistance of the soil around the driving member for civil engineering foundation work, a method of draining water around the driving member for civil engineering foundation work, that is, a combined method of water outflow can be considered. That is, when water flows out around the driving member for civil engineering foundation work, the soil around the driving member for civil engineering foundation work is mixed together with the water by vibration, and becomes slurry-like. As a result, the strong adhesion and frictional forces characteristic of viscous ground are almost completely eliminated. Therefore, the vibration energy of the vibrohammer is hardly used to vibrate the driving member for civil engineering foundation work in its axial direction against the frictional force with the soil, and is only used to vibrate the driving member for civil engineering foundation work in its axial direction. Used to reduce the strength of soil. As a result, the sinking speed of the driving member for civil engineering foundation work is improved, and the driving efficiency of the driving member for civil engineering foundation work is improved. In addition, since the soil around the driven members for civil engineering foundation work is in the form of a slurry, vibration propagation from the sides of the driven members for civil engineering foundation work to the surrounding ground can be almost completely prevented. The only vibration that occurs is when the tip of a driving member for civil engineering foundation work is continuously struck. As a result, ground vibration is also significantly reduced.

The object of this invention is to provide a driving member for civil engineering foundation work used in the above-mentioned water outflow combination method, that is, a driving member for civil engineering foundation work that can effectively drain water around the driving member for civil engineering foundation work. purpose.

In order to achieve this object, in the first invention, a water conduit is provided in the main body of a driving member for civil engineering foundation work almost parallel to its axis, the tip of the conduit is closed, and the water flow connected to the said conduit is provided. An outlet is provided in a direction substantially perpendicular to the axis of the driving member body for civil engineering foundation work, and water is supplied to the entire circumferential surface of the driving member for civil engineering foundation work near the water outlet of the driving member body for civil engineering foundation work. A hole for water flow is provided in a direction substantially perpendicular to the axis of the main body of the driving member for civil engineering foundation work.

In addition, in order to achieve the above-mentioned object, in the second invention, a conduit is provided in the main body of the driving member for civil engineering foundation work almost parallel to its axis, the tip of the conduit is blocked, and connected to the conduit. A water flow hole for supplying water to the entire circumferential surface of the driven member for civil engineering foundation work is provided in a direction substantially perpendicular to the axis of the driven member body for civil engineering foundation work, and connected to the water flow hole. The water outlet is provided in a direction substantially perpendicular to the axis of the main body of the driving member for civil engineering foundation work.

Fig. 2 is a schematic sectional view showing the steel sheet pile according to the first invention, Fig. 3 is a sectional view showing a part of the steel sheet pile shown in Fig. 2, and Fig. 4 is a - sectional view of Fig. 3. be. In the figure, 3 is the steel sheet pile main body, 4 is a water pipe fixed by staggered intermittent welding along the steel sheet pile main body 3, 5 is a water conduit formed in the water pipe 4, and the water conduit 4 is the steel sheet pile It is provided substantially parallel to the axis of the main body 3, and the lowermost end 4a of the water conduit 4 is crushed, and the tip of the water conduit 5 is closed. Reference numeral 8 denotes a water outlet provided in the water conduit 4. The water outlet 8 communicates with the water conduit 5, and the water outlet 8 is provided in a direction substantially perpendicular to the axis of the steel sheet pile body 3. 9 is a water flow hole for supplying water to the entire circumferential surface of the steel sheet pile body 3 provided near the water outlet 8 of the steel sheet pile body 3; the water flow hole 9 is connected to the axis of the steel sheet pile body 3; The water flow holes 9 are provided in a substantially perpendicular direction, and both ends of the water flow holes 9 are open to the surface of the steel sheet pile body 3. 6 is a low-pressure water device such as a water supply system, and 7 is a flexible hose whose one end is connected to the low-pressure water device 6 and the other end is connected to the water conduit 4.

With this configuration, the low pressure water device 6
The water discharged from the steel sheet pile main body 3 flows out from the water outlet 8 through the flexible hose 7 and the water conduit 5, and this flowing water flows along the periphery of the steel sheet pile main body 3 as shown by the arrow in Fig. 4. As a result, the soil around the steel sheet piles is mixed together with water by vibration and becomes slurry, which almost eliminates adhesive and frictional forces, improving the sinking speed of the steel sheet piles and improving the driving efficiency of the steel sheet piles. In addition to improving vibration propagation from the side of the steel sheet pile to the surrounding ground, it is almost completely possible to prevent ground vibration, thereby significantly reducing ground vibration. If water is to flow out in the direction of the steel sheet pile sinking, the pressure associated with the sinking of the steel sheet piles will directly act on the water outlet, so the steel sheet pile will be able to avoid being blocked by soil. In order for water to flow out along the periphery of the area, the water pressure must be maintained at a level that overcomes this.
However, if the water outlet 8 is provided in the direction of sinking of the steel sheet pile, that is, in the direction substantially perpendicular to the axis of the steel sheet pile main body 3, as described above, the pressure of the soil will not directly act on the water outlet 8, and the water outlet 8 A water pressure of about 2 to 3 kg/cm ² is sufficient to avoid blockage by soil.
Therefore, a thin-walled pipe such as a normal gas pipe can be used as the water conduit 4, and a normal vinyl hose can be used as the flexible hose 7. Furthermore, if the water flows out in a direction almost perpendicular to the steel sheet pile body 3, the length of the water flow path can be made shorter than when the water flows out in the direction of the steel sheet pile sinking. This allows water to flow easily. Furthermore, since the steel sheet pile main body 3 is provided with the water flow holes 9, the length of the path through which water flows is shortened, so that only a small amount of water is required to apply the combined water outflow method. This is because when water flow holes 9 are not provided, water flows out only from one side of the steel sheet pile body 3, and the flow path for the water to spread around the entire circumference of the steel sheet pile body 3 becomes longer. Although it is a small amount, water diffuses into the surrounding soil during the flow, so the amount of water required increases accordingly.If the amount of water is reduced, the frictional force and adhesion force will decrease only on one side of the steel sheet pile. and the frictional force on the other side,
Adhesive strength may not be sufficiently reduced, and the advantages of the combined water outflow method may not be fully demonstrated. On the other hand, if the water flow holes 9 are provided, the water can easily flow around the steel sheet pile body 3 through the shortest path as shown by the arrow in Fig. 4, so the amount of water can be reduced. Water is supplied all around the steel sheet pile body 3 even in a small amount.

FIG. 5 is a cross-sectional view showing another steel sheet pile according to the first invention, and FIG. 6 is a cross-sectional view taken from FIG. In this steel sheet pile, a water flow groove 10 is provided in a portion of the steel sheet pile main body 3 where the water flow hole 9 is provided. Therefore, water flows along the water flow grooves 10, so water can flow all around the steel sheet pile main body 3 more effectively than the steel sheet piles shown in FIGS. 2 to 4. I can do it.

FIG. 7 is a cross-sectional view showing another steel sheet pile according to the first invention, FIG. 8 is a cross-sectional view taken from FIG. 7, and FIG. 9 is a cross-sectional view taken from FIG. 8. In this steel sheet pile, a water flow guide member 11 is attached to the lower part of the steel sheet pile main body 3 in which the water flow holes 9 are provided. Therefore, water flows along the water flow guide member 11, so water can flow all around the steel sheet pile main body 3 more effectively than the steel sheet piles shown in FIGS. 2 to 4. I can do it.

FIG. 10 is a cross-sectional view showing a concrete pile according to the second invention, and FIG. 11 is a cross-sectional view of FIG. 10. In the figure, 12 is a cylindrical concrete pile body, 12a is a metal fitting fixed to the upper part of the pile body 12, and 13 is a water conduit provided inside the pile body 12, that is, a water conduit machined into the pile body 12. 1
3 is provided substantially parallel to the axis of the pile body 12, and the tip of the water conduit 13 is closed. 14 is an annular water flow hole provided at the bottom of the pile body 12 for supplying water to the entire circumferential surface of the pile body 12; The water flow hole 14 is connected to the water conduit 13. 15 is a water outlet provided at the bottom of the pile body 12, the water outlet 15 is provided in a direction substantially perpendicular to the axis of the pile body 12, and the water outlet 15 is connected to the water flow hole 14. . 13a is a large diameter portion provided at the upper end surface portion of the pile main body 12 of the water conduit 13, that is, the joint surface portion;
is a water inlet provided at the upper part of the pile body 12, and the water inlet 16 communicates with the water conduit 13.

In this pile, the large diameter portion 13a of the water conduit 13
After attaching a plug to and blocking it, and connecting the water inlet 16 and the low-pressure water device, attach the pile body 12 to a vibro hammer, vibrate the pile body 12 in its axial direction, and connect the water inlet 13 and water flow hole. By letting water flow out from the water outlet 15 through the water outlet 14, concrete piles can be driven efficiently, and
Ground vibration is significantly reduced. Since the water flow holes 14 are provided in the pile body 3, water is supplied all around the pile body 12 even if the amount of water is small. In addition, the headrace 13 is connected to the pile body 12 at the site.
There is no need to set up a
Moreover, since mass production is possible, it can be supplied at low cost.

FIG. 13 is a sectional view showing another concrete pile according to the second invention, and FIG. 12 is a sectional view showing a joint pile body of the concrete pile shown in FIG. 13. In the figure, 17 is the concrete pile body, 17a,
17b is a metal fitting fixed to the lower and upper parts of the pile body 17; 18 is a water conduit provided in the pile body 17; the water conduit 18 is provided substantially parallel to the axis of the pile body 17. Reference numerals 18a and 18b are large-diameter portions provided on the joint surface of the water conduit 18, and 19 and 20 are water inlets provided in the pile body 17. The water inlets 19 and 20 communicate with the water conduit 18. And the tip pile body is the 10th
It has the same structure as the concrete pile shown in Figures 1 and 11.

Next, the procedure for driving such concrete piles will be explained. First, a plug is attached to the large diameter portion 13a of the water conduit 13 of the tip pile body to block it.
After connecting the water inlet 16 and the low-pressure water device, attach the tip of the pile body to the vibro hammer, and then
2 is vibrated in its axial direction and the tip pile body is made to sink while water is flowing out from the water outlet 15.
When the tip pile body sinks until the water inlet 16 is almost underground, the plug is removed from the large diameter portion 13a, and the water inlet 16 is closed with the plug. Next, as shown in Figure 13, the water inlet 1 of the joint pile body
9 and the large-diameter portion 18b with plugs 21, and after connecting the water inlet 20 and the low-pressure water device, a joint pile body is installed, and a sealing member 22 made of an elastic body and having a water conduction hole 22a in the center is installed. , headrace 13,
18 are placed in the large diameter portions 13a and 18a so that they communicate with each other, and then the metal fitting 12a and the metal fitting 17a are welded. Then, a pile in which the tip pile body and the joint pile body are integrated is driven by a combined water outflow method.

In this manner, in the concrete pile shown in FIG. 13, by allowing water to flow out from the water outlet 15, the concrete pile can be driven efficiently and ground vibration can be significantly reduced. Since the water flow holes 14 are provided in the pile body 12, water is supplied all around the pile body 12 even if the amount of water is small. In addition, there is no need to install the headrace channels 13 and 18 in parallel with the pile bodies 12 and 17 on-site, and they can be manufactured in the factory under sufficient control, allowing for high-quality manufacturing and mass production. Therefore, it can be supplied at low cost.
Furthermore, using the sealing member 22, the water conduits 13 and 18
Since the water passages 13 and 18 are communicated with each other, the water conduits 13 and 18 can be easily connected, and the combined water outflow method can be easily applied.

In addition, in the above-mentioned Example, although the steel sheet pile and the concrete pile were demonstrated, it is natural that this invention can be applied to the driving member for other civil engineering foundation work. In addition, in the above embodiment, the water pipe 4
The lowermost end 4a of the water conduit 5 is crushed to close the tip of the water conduit 5, and a water outlet 8 connected to the water conduit 5 is provided. The tip of the water conduit 5 may be closed and a water outlet 8 may be formed.

As explained above, the driving member for civil engineering foundation work according to the present invention can be used in a combined method for water outflow, and even if the amount of water is small, it will thoroughly distribute water around the main body of the driving member for civil engineering foundation work. Because it can be supplied, the soil can be uniformly slurried around the entire circumference of the driven members for civil engineering foundation work, which uniformly reduces the frictional force and adhesive force on the sides of the driven members for civil engineering foundation work. This allows the advantages of the combined water outflow method to be fully utilized. As described above, the effects of this invention are remarkable.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the vibration driving method for driving members for civil engineering foundation work, Fig. 2 is a schematic cross-sectional view showing the steel sheet pile according to the present invention, and Fig. 3 shows a part of the steel sheet pile shown in Fig. 2. The sectional view shown in Fig. 4 is - of Fig. 3.
5 is a cross-sectional view showing another steel sheet pile according to the present invention, FIG. 6 is a cross-sectional view of FIG. 5, and FIG.
Figure 8 is a cross-sectional view of another steel sheet pile according to the present invention, Figure 8 is a cross-sectional view of Figure 7, Figure 9 is a cross-sectional view of Figure 8, and Figure 10 is a concrete pile according to the present invention. FIG. 11 is a cross-sectional view of FIG. 10, FIG. 12 is a cross-sectional view of the jointed pile body of the concrete pile shown in FIG. 13, and FIG. 13 is a cross-sectional view of another concrete pile according to the present invention. FIG. 3... Steel sheet pile body, 4... Water conduit, 5... Water conduit, 8... Water outlet, 9... Water flow hole, 12...
... Concrete pile body, 13 ... Headrace channel, 14 ...
... Water flow hole, 15 ... Water outlet, 17 ... Concrete pile body, 18 ... Water conduit.

Claims (1)

[Scope of Claims] 1. A conduit is provided in the main body of the driving member for civil engineering foundation work approximately parallel to its axis, the tip of the conduit is closed, and a water outlet connected to the conduit is used for the civil engineering foundation work. A water flow hole is provided in a direction substantially perpendicular to the axis of the driving member body for civil engineering foundation work, and near the water outlet of the driving member body for civil engineering foundation work, for supplying water to the entire circumferential surface of the driving member for civil engineering foundation work. A driving member for civil engineering foundation work, characterized in that the driving member for civil engineering foundation work is provided in a direction substantially perpendicular to the axis of the driving member body for civil engineering foundation work. 2. The driving member for civil engineering foundation work is a steel sheet pile, and the water conduit is formed within a water conduit fixed to the main body of the driving member for civil engineering foundation work. Drive-in components for civil engineering foundation work. 3. A water conduit is provided in the main body of the driven member for civil engineering foundation work almost parallel to its axis, the tip of the water conduit is closed, and water is applied to the entire circumferential surface of the driven member for civil engineering foundation work that is connected to the water flow channel. A water flow hole for supplying water is provided in a direction substantially perpendicular to the axis of the main body of the driving member for civil engineering foundation work, and a water outlet connected to the water flow hole is provided in a direction substantially perpendicular to the axis of the main body of the driving member for civil engineering foundation work. A driving member for civil engineering foundation work, characterized by being installed in an almost right-angled direction. 4. The driving member for civil engineering foundation work according to claim 3, wherein the driving member for civil engineering foundation work is a concrete pile, and the water conduit is formed within the main body of the driving member for civil engineering foundation work. Element.