JPS6039809B2 - Rock penetration method for steel pipe piles using a weight type excavator and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new method for penetrating steel pipe piles into rock using a weight type excavator, and a new device for the same.

As a foundation construction method for bridge piers and other land and offshore structures,
Steel pipe piles are used. In the conventional foundation construction method using steel pipe piles, the steel pipe piles are penetrated through the general soil layer up to the bedrock layer using a Pipro hammer or a diesel pile hammer, and the bedrock section is dug and excavated using a rotary rock excavator. A method in which reaming excavation is performed, and then the steel pipe pile is penetrated to the target depth again using a pipe hammer or diesel pile hammer, and ■ steel pipe pile diameter + 0.3.
An excavation hole diameter with an excess of m is drilled in advance, a specified steel pipe pile is erected in this excavation hole, the space between the hole wall and the steel pipe pile is grouted with mortar, etc., and the steel pipe pile is hardened. The usual method is to do this.

This conventional construction method requires: ■ Since many types of construction machines are required, it takes a considerable amount of time to replace them.

■ Construction costs are high because a wide variety of construction equipment is required.

■ Construction work such as reaming and excavation requires advanced technology, experience, and track record.

■ Since it is necessary to secure a drilling hole diameter considerably larger than the diameter of the steel pipe pile, the construction period will be longer and the construction cost will be higher.

■ There are many types of work other than excavation.

■ It is necessary to strictly control the vertical accuracy of the borehole wall.

There are problems such as:

In addition, as shown in FIG. 1, a casing pipe 3 is used as a foundation construction method using a dowel type excavator.

That is, a casing pipe 3 is vertically held and fixed by a power casing jack 2 provided on an excavator mounting base 1, and a wire loaf is connected to a driving device such as a winding winch (not shown) in the section of the pipe 3. A weight 4 connected to the car weight 4 is inserted, and excavation is carried out by the impact force generated by the falling stroke of the weight 4, and the so-called shear excavated is transferred to a receiving hopper 7 etc. by an air lift means 5 etc. via a shear lift pipe 6. There is something that makes you feel better. The casing pipe 3 in the foundation construction method shown in Fig. 1 only functions as a falling guide member for the car weight 4 and to prevent the collapse of soft layers such as sludge, and is not press-fitted into the target rock. Therefore, it is essentially different from the foundation construction method using steel pipe piles, and therefore, the method described above is currently being adopted as the method of penetrating the bedrock with steel pipe piles.

The present invention has been devised in view of the above-mentioned circumstances, and when excavating the target rock using a weight type excavator, it applies impact force to the pile cap of the steel pipe pile, thereby making it possible to dig into the rock. The purpose of the present invention is to provide a construction method in which steel pipe piles are penetrated into bedrock along with excavation, thereby making it possible to penetrate the bedrock with steel pipe piles in the correct vertical position. In particular, in this penetration work, by eliminating mutual interference during impact between the hollow digging weight and the pile head striking vehicle weight and allowing so-called free fall, both steel pipe piles can be quickly penetrated into the rock. The purpose is to provide a construction method that can be implemented without considering the timing of striking a heavy bell or digging. A further object of the present invention is to provide an apparatus which is capable of achieving the above-mentioned objects, and which also enables hollow excavation of the target rock mass using only a car bell for medium excavation, if necessary. Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 2, a river is the target bedrock, and in this example, a bedrock below the water surface 11 is illustrated, but this may be a bedrock on land.

Reference numeral 12 indicates a steel pipe pile serving as a foundation pile, and a sharp fracture portion 14 is formed by welding a steel plate reinforcing ring 13 to the tip of the pile.
A steel plate reinforcing ring 15 is attached to the pile cap.

The steel pipe pile 12 is vertically installed and held on the target bedrock 10 above the water surface using a wire rope, a power casing jack, etc., using a weight-type excavator (not shown) attached to the hem.

Reference numeral 16 denotes a pile head striking weight, which is applied to the pile head of the steel pipe pile 12, and its countermeasure is carried out using a hanging device such as a wire rope of an excavator.

The pile head striking car bell 16 is a cylindrical weight having a cylindrical hole 19 in the center, which is integrally formed with a mounting flange 17 and an iron fitting part 18. It has a length that does not fall out from the pile head, and is provided with a tapered portion 20 at the lower part for guidance when tying together the piles.

21 is a weight for medium digging, and in this example, there are two inner and outer weights at the bottom.
It has an excavating part 22 having a heavy excavating claw, and has an insertion hole 24 for a shear discharge pipe 23 in the center thereof.

The shear discharge pipe 23 has a built-in air lift means (not shown) for discharging the excavated material out of the pipe. The heavy bell 21 for medium digging is inserted into and removed from the steel pipe pile 12 using a rope 25 such as a hanging wire or rope to a driving device such as a winding winch installed on an excavator (not shown), and is inserted into and removed from the steel pipe pile 12. The steel pipe pile 12 can be moved up and down alternately under a required vertical stroke, and the tip of the steel pipe pile 12 can be dug in advance by the impact force caused by the fall of its own weight.

In order to apply digging force to the steel pipe pile 12 with the pile head striking car bell 16, a loaf is provided on the upper surface of the car weight 16.

The rope 25 is provided with an engaging body 27 having a coupling device 26 and engaging the coupling device 26 from below.
That is, as shown in FIGS. 3 1 and 2, the rope coupling device 26 is configured so that the car weight flange 7 is removably firmly fixed with bolts (not shown) or welded together, and in the example shown in FIG. It has 23 insertion portions 28, and in this example, two vertical holes 29 for rope insertion are bored in the portion corresponding to the rope 25.

When the rope 25 is joined with a gastric pressure clamp 32 consisting of a split sleeve 30 and a nut 31, the vertical hole 29 is bored through which the clamp 32 can be inserted, as shown by a ring on the upper surface of the clamp 32. An engaging body 27 is provided. Further, as shown in FIG. 3 2, when the clamp 32 is not used, only the engaging body 27 may be fixed to the rope 25, and although not shown, when the diameter of the clamp 32 is larger than the vertical hole 29, the clamp 32 may be fixed to the rope 25. 32 can constitute an engaging body, as shown in FIGS. 3 1 and 2 in any case. 25
is inserted into the vertical hole 29 in advance from the bottom toward the top, so that the engaging body 27 is configured to engage with the coupling device 26 in the upward direction. Therefore, according to the present embodiment, when the rope 25 is wound up and the hollow digging weight 21 is suspended and raised, the engaging portion 27 provided on the rope 25 is connected to the pile head striking weight 1.
6, and the pile head striking weight 16 is suspended there together with the heavy bell 21 for digging.

Thereafter, by disconnecting the cinch clutch of the hoisting rope 25, the pile head impacting heavy mirror 16 and the digging weight 21 are removed.
By dropping both under their own weight, the wheel weight 16 applies impact force to the pile head of the steel pipe pile 12, and the tip crushing part 14 excavates the rock 10, and the excavation part 22 of the wheel weight 21 excavates the steel pipe pile 12. The tip is excavated in advance. During this excavation, both the weights 16 and 21 are both dropped in a free state, that is, without interfering with each other. Even if the impact or excavation timing of the car bells 16, 21 is off, the falling energy of both the weights 16, 21 can be applied as excavation force, and the rock mass can be quickly and accurately excavated to the required depth. The steel pipe pile 12 is press-fitted here, and the excavation part 22 excavates the hole in advance, and the crushing part 14 scrapes off the hole wall, making it easy to press-fit the steel pipe pile 12.

FIGS. 4 1 and 2 show other specific examples of the present invention, in which the engaging body 27
The engaged body 33 that can be freely engaged and detached from the striking wheel weight 16
In this example, the coupling device 26 is provided on the lower surface of the holder.

In the example shown in Figure 4 1 and 2, both car bells 1 mentioned above
6, 21 and excavation using the steel pipe pile 11 can be carried out, as well as making it possible to carry out single excavation of the medium excavation.

To explain this in detail with reference to FIGS. 1 and 2, the coupling device 2
A pair of slide guide rails 34 are fixedly installed on the lower surface of 6 and on both sides of the vertical hole 29, and guide parts 35 are provided on the upper and lower sides of each of the slide guide rails 34, and corresponding parts are provided with semicircular parts 36, for example. When the combined body 33 is slidably joined and the engaged body 33 is closed, the rope 25 can be inserted through the notch 36, but the engaging body 27 indicated by the clamp 32 is inserted upward into the engaged body 33. On the other hand, the engaged body 33 is the fourth
The engaging body 27 is configured to separate from the notch 36 when separated on the rail 34 as shown by the chain line in FIG.

Therefore, according to the device shown in FIGS. 1 and 2, when the engaged bodies 33 are closed, the two wheels 16 and 21 are used to perform medium digging and the steel pipe pile 11 is removed in the same manner as shown in FIG. Excavation can be carried out, while the engaged body 33
When released, it becomes possible to move only the weight 21 up and down while the wheel weight 16 remains in contact with the pile head of the steel pipe pile 11.

In summary, the first feature of the present invention is that the fracture portion 1 is provided at the tip.
4 is installed vertically on the target bedrock 10, and a striking car bell 16 is placed on the pile head of the steel pipe pile 12, and a hammer bell 16 is installed inside the steel pipe pile 12 so as to be freely strokeable up and down. By inserting the weight 21, suspending and holding together the pile head striking weight 16 and the heavy digging bell 21 in the rising direction, and then allowing both the weights 16 and 21 to fall under their own weight without interfering with each other. , the steel pipe pile 1 via the pile head striking weight 16
2, a weight 21 for medium digging is applied to the target bedrock 10 at the tip of the steel pipe pile 12, and the steel pipe pile 12 penetrates into the bedrock 10'. Since this is related to the rock penetration method for steel pipe piles, the lower end of the steel pipe pile 12 is dug by the medium digging weight 21, and the striking force of the striking vehicle weight 16 is applied to the pile head of the steel pipe pile 12. There is an advantage that the steel pipe pile 12 can be excavated and penetrated into the bedrock 10 quickly and accurately in the vertical direction.

In particular, during this excavation work, the weight 21 for medium digging and the weight 16 for hitting the steel pipe pile head do not interfere with each other in the falling direction, that is, the direction of impact application, and are so-called free. , 21 do not adversely affect each other, and even if there is a difference in impact timing, the steel pipe pile 12 can be penetrated without buckling.
The second feature of the present invention is a device for penetrating a steel pipe pile 12 having a fractured part 14 at the tip into a bedrock 10, and a steel pipe pile 12 installed vertically on the target bedrock 10 has a steel pipe attached to its head. The pile head striking bell 16 that has been re-matched: and the weight type 21 for hollow digging inserted into the steel pipe pile 12 so as to be freely strokeable up and down;
a rope 25 for suspending the hollow digging weight 21 so that it can be freely stroked up and down; An engaging body 27 that can be freely inserted into the vertical hole 29 is provided, and a split-shaped engaged body 33 that can be freely engaged with and detached from the engaging body 27 is provided on the lower surface of the pile head striking force weight 16. Since the present invention relates to the penetration of rock by a steel pipe pile using a weight type excavator, in addition to the basic effects of being simple in structure and easy to implement as a device that achieves the first feature,
Since the engaging body 27 provided on the lobe 25 can be freely engaged and disengaged from the engaged body 33 provided on the impacting dowel 16, it is also possible to move the intermediate dolly type 21 alone up and down. This has the advantage of being possible. Therefore, according to the present invention, by inserting a reinforcing bar key etc. into the steel pipe pile 12 that has penetrated 10' into the rock, and by casting and hardening a filling material such as concrete, it is possible to make the structure strong regardless of whether it is a building on land or at sea. It has the advantage of being able to construct foundation piles that are strong, vibration resistant, and durable, and is of great practical benefit.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an example of a conventional foundation construction method, Fig. 2 is an elevational sectional view of an embodiment of the present invention, and Fig. 3 1 and 2 are enlarged sectional views showing two examples of the part indicated by arrow A in Fig. 2. , FIG. 41 is a sectional view showing another preferable example of FIG. 3, and FIG. 42 is a BB--X diagram of FIG. 4. 12... Steel pipe pile, 14... Excavation section, 16...
...Flea weight for hitting pile head, 21 ... Weight for medium digging, 22 ... Excavation part, 25 ... Lobe,
26... Rope coupling device, 27... Engaging body, 33... Engaged body. Figure 1 Figure 3'JJ Figure 3 Figure 2 Figure 4' Figure 4 '2J

Claims (1)

[Claims] 1. A steel pipe pile 12 having a fractured part 14 at the tip of a rock mass 1
0 vertically, and the striking weight 16 is fitted and placed on the pile head of the steel pipe pile 12, and the digging weight 21 is inserted into the steel pipe pile 12 so as to be vertically strokeable. The pile head impacting weight 16 and the medium digging weight 21 are both suspended in the ascending direction, and then both weights 16 and 21 are allowed to fall under their own weight without mutual interference. The steel pipe pile 12 is penetrated into the bedrock 10 by applying an excavating and crushing force to the steel pipe pile 12 via the shaft 16, and while excavating the target bedrock 10 at the tip of the steel pipe pile 12 for medium excavation with the medium excavation weight 21. A unique method of penetrating steel pipe piles into rock using a heavy weight excavator. 2 A device for penetrating a steel pipe pile 12 having a fractured part 14 at the tip into a bedrock 10, in which a pile cap impacting weight fitted and placed on the pile cap of the steel pipe pile 12 vertically installed on the target bedrock 10 is used. A weight 16; a weight 21 for medium digging inserted into the steel pipe pile 12 so as to be freely strokeable up and down; and a rope 25 for suspending the weight 21 for medium digging so as to be freely strokeable up and down; The striking weight 16 is provided with a vertical hole 29 through which the rope 25 is inserted, and the rope 25 is provided with a vertical hole 29 through which the rope 25 is inserted.
An engaging body 27 that can be freely inserted is provided in the pile head striking weight 1.
6. A rock penetration device for steel pipe piles using a weight type excavator, characterized in that a split-shaped engaged body 33 that can be freely engaged and detached from an engaging body 27 is provided on the lower surface of the body 6.