JP3306460B2 - Pile driving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving method which is suitable when there is an obstacle such as reinforced concrete or rock in the ground.

[0002]

2. Description of the Related Art When a column pile (column wall) is constructed by a PIP pile method or a PIP method, an auger is first drilled, and a solid material such as mortar is discharged from a tip of an auger hollow shaft when the auger is pulled up. The process of constructing mortar piles and then press-fitting steel bars and steel cages into the mortar piles is adopted.
By the way, in this construction method, slabs and footings of various concrete structures may be present at the planned pile positions. If these underground obstacles are known in advance, dig into the concrete surface of the underground obstacles using the deep foundation method, drill diamond in the concrete, eliminate the excavation, and then resume auger drilling. ing. Also, if the existence of an underground obstacle is not known in advance, when the tip of the auger hits the underground obstacle, withdraw the drilling machine, dig down by the deep foundation method as described above, and cut the diamond. A hole is made to penetrate underground obstacles (core removal).

[0003]

[Problems to be solved by the present invention] The above-mentioned conventional pile construction technology has the following problems.

<A> When an underground obstacle is present, any of the above-mentioned methods requires digging by a deep foundation method, installation of earth retaining material, replacement of a drilling machine, etc., and a great deal of time is required. And costly.

<B> Every time an underground obstacle is present, the construction machine must be replaced to perform the construction, resulting in poor construction efficiency.

<C> In the case where the construction site is a railway line which waits for the passage of the last train, the work time is extremely short, so that efficient construction is required. However, with conventional construction techniques, it is difficult to construct efficiently because the work time and work space are subject to many restrictions. Against this background, proposals for improved techniques are desired.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a pile driving method capable of performing construction efficiently and at low cost.

[0008]

That is, according to the present invention, a crawler body having traveling means is provided with a pile driving machine having a telescopic leader, and only a perforated cylinder is rotatably set on the telescopic leader. contraction operation of pile driver while its weight is allowed to act on the bit in drilling tube tip of to puncture holes in the ground disabilities
The harmful substance is cut off by a perforated cylinder, and the perforated cylinder is
Up through the drilling cylinder to the ground, then drill
Set the auger screw in the hole
This is a pile driving method in which a pile is constructed by piercing and placing mortar or the like in the pierced hole .

Further, according to the present invention, a crawler body having traveling means is provided with a pile driving machine having a telescopic leader, and only a perforated cylinder is rotatably set on the telescopic leader, and a lower portion of the perforated cylinder is formed at a drilling site. bits formed by overlaying a, the weight of the pile driver while shrinkage operation of the expansion and contraction reader to act on the bit in the borehole tube tip to puncture holes, underground obstacles perforated tube
Cut, the perforated cylinder penetrated the underground obstacle
Lift the drilling cylinder to the ground, and then
Set the logger screw and pierce it to the specified depth.
Driving mortar, etc. into the drilled hole to construct a pile,
It is a pile driving method.

Further, the present invention uses a pile driving machine having a crawler body having a traveling means and a telescopic leader, wherein only a perforated cylinder is rotatably set on the telescopic leader, and a hard material is provided under the perforated cylinder. Attach a bit that has
While shrinkage operation of the expansion and contraction reader the weight of pile driver to act on the bit of the drilling tube tip to puncture hole, puncture underground obstacles
Cut by a perforated cylinder, a perforated cylinder penetrates an obstacle underground
Then, lift the drilling cylinder to the ground, and then
Set an auger screw and pierce it to a predetermined depth,
This is a pile driving method in which a mortar or the like is driven into a drilled hole to construct a pile.

[0011]

Embodiment 1 Embodiment 1 of the present invention will be described below with reference to the drawings.
Will be described.

<A> Pile Driver As shown in FIG. 1, a pile driver 10 has a main body 11 having a crawler-type underbody, and a reader attached to the main body 11 and capable of tilting by expanding and contracting a cylinder 123. 12. The reader 12 includes a main reader 121 and a sub-leader 122. The sub-leader 122 inserted in the main reader 121 slides by fluid pressure and is configured to be expandable and contractible. The auger device 13 is provided at the upper end of the sub reader 122.
Are attached integrally. A connection joint 131 is provided at the axis of the auger device 13 so that a perforating member of the perforating cylinder 21 or the auger screw 22 can be selectively mounted as needed.

<B> Perforated cylinder Although a known auger screw 22 can be used among the perforated members, the perforated cylinder 21 is manufactured at a construction site according to the situation of the underground obstacle 30. As shown in FIG.
Is a cylindrical body whose upper end is closed and whose lower end is opened.
11 are installed. A bit 212 is formed below the perforated cylinder 21. The bit 212 is formed by building up at a construction site, and a composite material of, for example, cobalt and tungsten carbide can be adopted as a material thereof. As shown in FIG. 3, the bit 212 is built up on the lower end face, lower inner peripheral face and outer peripheral face of the drilling cylinder 21 by gas welding or arc welding together with the melting material, for example.

[0014]

Next, the construction procedure of the pile driving method will be described.

<A> Setting of the perforation cylinder The extent of the underground obstacle 30, such as the size and hardness at the perforation site, is checked in advance. The underground obstacle 30 is an existing building slab or footing, a bedrock, or the like made of reinforced concrete. The amount of build-up of the bit 212 is determined according to the degree of the underground obstacle 30, and the bit 212 is welded to the lower end of the perforated cylinder 21. The welding operation can be performed by general arc welding or the like. After the installation of the bit 212, the drilling cylinder 21 is set in the auger device 13 of the pile driver 10 as shown in FIG.

<B> Punching Operation While operating the auger device 13, the leader 12 is contracted to start punching. The lower end of the perforated cylinder 21 is an underground obstacle 30
The contact is continued after the contact is made, and the leader 12 is contracted. When it is desired to increase the drilling force during drilling, the amount of shrinkage of the leader 12 is increased, the weight of the pile driver 10 is applied to the drilling cylinder 21, and the bit 212 below the drilling cylinder 21 is removed from the ground or an underground obstacle. Press against As a result, a very large piercing force can be obtained. When the bit 212 of the piercing tube 21 is worn out by the piercing, the piercing tube 21 is pulled up once, and the bit 2 is
Repair 12 and restart drilling. When the drilling cylinder 21 has penetrated the underground obstacle 30, the drilling cylinder 21 is pulled up while keeping the position of the pile driver 10, and separated from the auger device 13. When removing the perforated tube 21, the leader 12 is slightly inclined and the perforated tube 21 is inclined and pulled up. By performing the lifting operation in this manner, the cut-out underground obstacle 30 can be collected on the ground. Subsequently, the screw auger 22 is set in the auger device 13 as shown in FIG.
The hole is drilled to a predetermined depth.

<C> Construction of Mortar Pile When the screw auger 22 is pulled up, mortar is discharged from the tip of the hollow auger shaft to construct the mortar pile 41.

<D> Insertion of Steel Material A steel material 42 such as a model steel is inserted into the mortar pile 41 using the same pile driving machine 10 to complete the construction of the pile body. In addition, the construction method of the pile body after core removal is not limited to the PIP method, but various known methods can be adopted.

[0019]

Second Embodiment In the first embodiment, the case where the pile body is constructed in the vertical direction has been described. However, the pile body can be constructed obliquely by adjusting the inclination of the reader 12 arbitrarily.

[0020]

[Embodiment 3] In the above-described embodiment 1, the bit 212 is
Is formed at the lower part of the hole.
Alternatively, a prefabricated bit made of a different material may be attached to the lower part of the drilling cylinder 21 for drilling. An off-the-shelf bit whose inner surface, outer surface, and lower end surface are made of hard material such as cobalt and tungsten carbide composites is used.

[0021]

As described above, the present invention has the following effects.

<A> Even when a hard underground obstacle such as reinforced concrete exists in the ground to be drilled, the underground obstacle can be cut and drilled with the same drilling cylinder. For this reason, even if there is an underground obstacle at the drilling position as in the related art, there is no need to replace the drilling tool or the drilling machine itself, and the construction can be performed efficiently.

<B> Even if there is an underground obstacle, the drilling can be continuously performed, and the conventional deep foundation work is not required, so that the labor is greatly reduced, the construction time is reduced, and the construction cost is reduced. Can be achieved.

<C> Since the hole is drilled while the telescopic leader is contracted, the self-weight of the pile driver can be effectively used at the time of drilling, and the underground obstacle can be drilled with high efficiency.

<D> Since the bit is built up at the site, the protrusion amount and the attachment range of the bit can be arbitrarily adjusted according to the drilling situation at the site. Repair of worn bits is also easy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory view of a perforated cylinder.

FIG. 3 is a bottom view of the perforated cylinder along III-III in FIG. 2;

Fig. 4 Illustration of pile driving method

Fig. 5 Illustration of pile driving method

FIG. 6 is an explanatory view of a pile driving method.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 5/38 E02D 5/34 E21B 10/48

Claims (3)

(57) [Claims] 1. A pile driving machine having a telescopic leader provided on a crawler body having a traveling means, wherein only a perforated cylinder is rotatably set on the telescopic leader, and the pile driving machine is contracted while performing a contracting operation of the telescopic leader. Perforate own weight
It is allowed to act on the bit in the barrel tip to puncture hole, when the underground obstacle cut by drilling tube, perforated tube penetrates the underground obstacles, pull the perforated tube to the ground
And then set the auger screw in the hole
A pile driving method in which a drill is drilled to a predetermined depth and a mortar or the like is poured into the drilled hole to construct a pile. 2. A crawler body having a traveling means and a pile driving machine having a telescopic leader, wherein only a perforated cylinder is rotatably set on said telescopic leader, and a bit is placed under the perforated cylinder at the drilling site. padding and formed, the weight of the pile driver while shrinkage operation of the expansion and contraction reader to act on the bit in the borehole tube tip to puncture holes, cut underground obstacle by drilling tube, perforated tube is ground After piercing the obstacle, pull the perforated cylinder to the ground.
And then set the auger screw in the hole
A pile driving method in which a drill is drilled to a predetermined depth and a mortar or the like is poured into the drilled hole to construct a pile. 3. A crawler body having a traveling means and a pile driving machine having a telescopic leader, wherein only a perforated cylinder is rotatably set on said telescopic leader, and a hard material is built up at a lower portion of said perforated cylinder. bit-mounting were, the weight of the pile driver while shrinkage operation of the expansion and contraction reader to act on the bit in the borehole tube tip to puncture holes, cut underground obstacle by drilling tube, perforated tube is ground fault After piercing the object, pull the perforated cylinder to the ground
And then set the auger screw in the hole
A pile driving method in which a pile is drilled to a predetermined depth and a mortar or the like is poured into the drilled hole to construct a pile.