JPS63289115A - Method and apparatus for foundation pile - Google Patents

Abstract

PURPOSE:To obtain a pile hole of a high vertical accuracy in a stable condition by vertically moving a driver mechanism for excavation rod at low positions. CONSTITUTION:An excavating rod 9 is held by a holder 7 in a rotary cylinder 6. The rod 9 is rotationally penetrated into the ground by selecting the coupling position of the holder 7 in a casing and the vertical action of the cylinder 6 for excavation. A solidifying agent is injected from the tip of the rod 9 to improve the ground of the pit bottom, and the holder 7 and the rod 9 are removed. A steel tubular casing is then penetrated into the pit, a core material is set, and the casing is drawn out while injecting a solidifying agent from the tip of the casing. A foundation pile of high reliability can thus be constructed with high accuracy by a simplified process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for constructing foundation piles in civil engineering work.

[Conventional technology and its problems]

The common method for creating pile holes when constructing foundation piles is to use an excavator such as an earth auger. Since the device is moved up and down by hand, the stability of the entire device is extremely poor.

In addition, the accuracy of inserting the auger screw into the ground is poor, and the auger screw is built diagonally, making it difficult to obtain a vertical pile hole.

Furthermore, the drive device that moves the long leader mast up and down is only used to rotate the auger screw.
This cannot be used for building other members such as a casing, and has poor versatility.

The purpose of the present invention is to provide a foundation pile construction device which eliminates the disadvantages of the conventional example, allows stable excavation with a low center of gravity at all times, has good excavation accuracy, and can be used in various ways such as inserting a casing. The object of the present invention is to provide a method for constructing foundation piles that can be performed using this device and that can provide highly accurate and reliable piles through a simple process.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes an excavation mechanism that is provided on a base machine or the like so as to be movable up and down, and includes a motor, a reducer, and a chuck device connected to the motor via the reducer; A device is used, which consists of a rotating cylinder whose outer circumference is locked with By appropriately selecting the vertical movement of the cylinder and the locking position of the holder in the casing, the drilling rod is rotated and inserted into the ground to drill a hole, and a solidifying agent such as cement milk is injected from the tip of the drilling rod. This is stirred with the tip of the drilling rod to improve the ground at the bottom of the hole, and in the same way, the vertical movement of the rotating cylinder and the locking position of the holder are selected appropriately, the drilling rod is pulled up, and the holder and drilling rod are removed. A steel pipe casing is placed in the hole from the top of the rotating cylinder, then a core material such as concrete pile or H-shaped steel is placed in the hole from the top of the rotating cylinder, and a solidifying agent such as cement milk is injected from the tip of the casing. The gist of this is to fill the outside of the core material and then pull out the casing.

[Effect]

According to the present invention, the excavation rod is rotationally driven via the rotating cylinder, and the excavation mechanism that drives the rotating cylinder only moves up and down in a low position, so it is in a stable state without the risk of falling over. The work can be carried out using the same method, and pile holes with high vertical accuracy can be obtained.

Furthermore, it is also possible to work by attaching items other than the drilling rod to the holder inside the rotary cylinder, such as a casing, steel pipe, sheet pile, concrete shaft, down-the-hole hammer, drilling packet, or other impact hammer.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the apparatus of the present invention will be explained first.

FIG. 1 is a longitudinal sectional front view showing an embodiment of the foundation pile construction device of the present invention, and 1 in the figure shows the motor 2, the speed reducer 3, and the motor 2.
This shows an excavation mechanism consisting of a chuck device 4 and a chuck device 4 connected via a speed reducer 3. The excavation mechanism 1 has a central portion that penetrates vertically,
In addition, a lifting cylinder 5 is attached to the side, and a second
It is attached to a short leader 18 which is freely movable up and down at the front part of the base machine 17 shown in FIGS.

The chuck device 4 is a pressing mechanism such as a tightening band, and numeral 6 in the figure is a rotating cylindrical body whose outer peripheral surface is locked by the chuck device 4.

The inside of the rotary cylinder 6 is open at its upper and lower ends, and a cylindrical holder 7 is housed therein so as to be movable up and down. Stop part a -
By forming a plurality of holes d and also forming pin insertion holes in the holder 7, the holder 7 and the rotating cylinder 6 can be locked in stages in the vertical direction with pins 8 inserted from the outside of the rotating cylinder 6. I made it a thing.

There are various types of holders 7, and a drilling rod 9 or a steel pipe casing 13, which will be described later, can be connected to them using a joint formed at the bottom.

The drilling rod 9 may be a normal earth auger screw, but in the case of this embodiment, as a modified type of auger screw, the hollow rod 9a is provided with fan-shaped plate-shaped consolidation blades 9b at appropriate vertical intervals. A discontinuous screw blade-like agitation blade 9C was formed between 9b, and the head 9d at the tip was a double screw blade with cutter pins arranged side by side, similar to the head of a normal auger screw.

The engagement relationship between the rotary cylinder 6 and the holder 7 is determined by manual locking using an insertion pin 8 inserted from the outside as in this embodiment. A protrusion that appears and retracts is provided, and this protrusion is connected to the engaging part of the rotating cylinder 6,
For example, it may be inserted into a through hole. In this way, the holder 7 can be automatically engaged and disengaged by hydraulic operation.

Furthermore, instead of installing the excavation mechanism 1 on a self-propelled type base machine 17 having a cover belt and drive wheels, it is also possible to attach the leader 18 to a self-propelled cart or the like and provide the leader 18 thereon.

Next, the construction method of the present invention using such a device will be explained.

Figures 4 to 12 show each step of the construction method of the present invention.
When the morph 2 is started, the chuck device 4 connected to its hollow rotating shaft via the speed reducer 3 also rotates, and the rotating cylinder 6 whose outer periphery is fixed to this also rotates.

On the other hand, if the elevating cylinder 5 is shortened, the entire excavation mechanism 1 is lowered. Since the excavation rod 9 is suspended within the rotary cylinder 6 via the holder 7, the excavation rod 9 also rotates, and the ground is drilled by the tip head 9d to form the pile hole 10.

FIGS. 13 and 14 show details of such excavation state, and as shown in FIG. 13, initially the holder 7 was latched to the uppermost notice part a of the rotary cylinder, the cylinder 5 was retracted, and the excavation mechanism 1 is lowered in its entirety along the leader 18, and when the holder 7 is lowered by that amount, the pin 8 is removed, the cylinder 5 is extended again, the cylindrical body 6 is raised, and the holder 7 is locked in the next stage locking part. do.

In this way, by moving the cylinder 5 up and down, the locking points of the holder 7 are successively lowered from a to d to perform excavation.

After the holder 7 has been moved to the locking portion d, as shown in FIG. 14, the chuck device 4 is moved up and down to push down the cylindrical body 6 to continue excavation.

Once all the drilling rods 9 have been erected, as shown in FIG. 15, in order to add the upper extension rod 9' to the drilling rod 9, the chuck device 4 is lifted with the rotary cylinder 6 suspended by a crane. Move up and chuck. At this stage, remove the pin 8, lift the rotary cylinder 6 a little higher with a crane, remove the holder 7 from the upper end of the lower drilling rod 9, and reattach it to the upper end of the additional rod 9'. , the additional rod 9' is jointed to the excavation rod 9, and the holder 7 and the rotary cylinder C are again pinned together.

Then, the process shown in FIG. 13 is repeated to perform excavation in the same manner.

The excavating rod 9 consolidates the earth and sand cut by the head 9d on the hole wall with the consolidation blades 9b without discharging it to the ground. Therefore, the hole wall is always compacted and has low frictional resistance, so even if the excavation depth increases, the frictional resistance does not increase. As a result, the tip head 9d can adjust the surface pressure necessary for the bit, and can easily excavate boulders and rock.

Moreover, this compaction effect prevents the hole wall from collapsing, so a highly reliable pile can be obtained.

After digging to a predetermined depth with the drilling rod 9°9' as shown in Fig. 5, a solidifying agent is poured from the tip of the head 9d using the inside of the hollow rod 9a as shown in Fig. 6. Cement milk 11 is injected into the pile hole 10, and at the same time, by reversing the rotary cylinder 6, the drilling rods 9, 9' are reversely rotated to mix the cement milk 11 with earth and sand, thereby improving the ground at the bottom of the hole. .

Next, the drilling rod 9.9' is pulled up as shown in FIG. 7, but the lifting procedure is the reverse of the drilling shown in FIGS. 13 and 14, and the chuck device 4 is rotated up and down. This is done by selecting the vertical movement of the cylinder 6 and the locking position of the holder 7 to the rotating cylinder 6 to move upward as appropriate.

In this case, it is not necessary to rotate the rotary cylinder 6 and the excavation rod 9°9', and they can be pulled up while stopped, but it is also possible to reverse them and pull them out.

Although not shown, when the drilling rods 9 and 9' are pulled out, the additional rod 9' is separated from the drilling rod 9 once it reaches the ground, and the holder 7 is reattached to the upper end of the drilling rod 9. and pull up the drilling rod 9.

When all the drilling rods 9 are above ground, the holder 7 and the rotary cylinder 6 are unlocked, and the drilling rods 9 are lifted up with a crane or the like and scattered. Next, as shown in FIG. 8, the steel pipe casing 13 is erected into the pile hole 10 by dropping it from the upper end opening of the rotary cylinder 6 using the cylinder 6 as a guide.

As described above, the steel pipe casing 13 is built in such a way that the hole wall is compacted and there is little frictional resistance, so that the casing 13 can be inserted into the pile hole IO using only its own weight.

However, as shown in FIG. 8, the casing 13
can also be press-fitted.

A holder 7 for erecting the casing is attached to the upper end of the casing 13, and the rotary cylinder body 6 and the casing 13 are connected, and the rotary cylinder body 6 of the holder 7' is Lower the locking part sequentially from a to d,
Further, the load of the excavation mechanism 1 is applied to the casing 13 by pushing down the rotating cylinder 6 by vertical movement of the chuck device 4.

Also, if necessary, rotate the rotating cylinder 6 to remove the casing 1.
You can also push in while rotating 3.

Once the casing 13 is erected, as shown in FIG. 9, a concrete pile 14 as a core material is similarly dropped from the upper end opening of the rotary cylinder 6 and inserted into the casing 13 of the pile hole 10. When adding concrete piles 14 above and below, insert them first, hold the head of the pile 14 with the holder 12 installed on the ground, and then lift the rotary cylinder 6 slightly to create a gap between the ground. Then, using this gap, the bails 14 are connected with each other by bolting.

When the tip of the concrete pile 14 reaches the cement milk 11 at the bottom of the pile hole 10, the Monken 15 is suspended into the rotating cylinder 6 as shown in FIG. The head of the pile 14 is hit with the Monken 15 to embed it in the cement milk 11 to obtain sufficient supporting force.

Next, as shown in FIG. 11, the steel pipe casing 13 is pulled out. 16 is poured out and the outside of the concrete pile 14 is filled with cement milk 16.

In this way, a foundation pile as shown in FIG. 13 is obtained.

In addition, in this embodiment, concrete pile 14 is used as the core material.
Although an example using a core material has been described, it is also possible to use a shaped steel material such as an H-shaped steel, a reinforcing bar cage, a steel pipe pile, etc. as the core material.

Furthermore, in addition to cement milk 16, mortar or the like may also be used as a solidifying agent.

Furthermore, although we have explained the case where the drilling rod 9 or the casing 13 is attached to the holder 7 inside the rotating cylinder 6, drilling is carried out by connecting steel pipes, sheet piles, concrete piles, down-the-hole hammers, excavation packets, other impact hammers, etc. Alternatively, construction work can also be done.

〔Effect of the invention〕

As described above, the foundation pile construction method and device of the present invention are as follows:
The excavation rod that performs excavation is driven via a rotating cylinder, and heavy excavation can be achieved by appropriately selecting the excavation mechanism as the driving part, the rotating cylinder, and the coupling position of the rotating cylinder and the drilling rod. There is no need to move the mechanism up and down significantly. As a result, construction can always be carried out in a stable condition with a low center of gravity, resulting in high safety.

Further, since the excavation rod excavates by the vertical movement of the rotary cylinder, a pile hole with high vertical accuracy can be obtained with less bending.

Furthermore, the rotary cylinder can be used as a guide for installing the casing and core material after creating the pile hole, and using the Monken, and various processes can be performed with the same device, simplifying the work.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing one embodiment of the foundation pile construction device of the present invention, Fig. 2 is a side view of a base machine to which the device of the present invention is attached, Fig. 3 is a plan view of the same, and Figs. Fig. 12 is a vertical cross-sectional front view showing each step of the foundation pile construction method of the present invention;
3 to 15 are explanatory diagrams showing detailed contents of the steps in FIGS. 4 and 5. 1... Excavation mechanism 2... Motor 3... Reducer 4... Chuck device 5... Elevating cylinder 6... Rotating cylinder 7.7'... Holder 8... Pin 9 ...Drilling rod 9'...
・Additional rod 9a...Hollow rod 9b・
... Consolidation blade 9c... Stirring l [9d... Head 1
0... Pile hole 11... Cement milk 12... Holder 13... Steel pipe casing 14... Concrete pile

Claims (2)

[Claims] (1) The drilling rod is held by a holder that can be locked in stages in a rotating cylinder that can be moved up and down, and the drilling rod can be moved by appropriately selecting the vertical movement of the rotating cylinder and the locking position of the holder in the casing. A hole is drilled by rotating it into the ground, and a solidifying agent such as cement milk is injected from the tip of the drilling rod, which is stirred at the tip of the drilling rod to improve the ground at the bottom of the hole.
Similarly, the vertical movement of the rotating cylinder and the locking position of the holder are selected appropriately, the drilling rod is pulled up, the holder and the drilling rod are removed, the steel pipe casing is erected into the hole from the upper end of the rotating cylinder, and then the rotating cylinder is Concrete pile from the top, H
Construction of a foundation pile characterized by erecting a core material such as shaped steel into a hole, injecting a solidifying agent such as cement milk from the tip of the casing, and pulling out the casing while filling the outside of the core material with this. Law. (2) An excavation mechanism that is installed on a base machine etc. so as to be movable up and down and consists of a motor, a reducer, and a chuck device connected to the motor via the reducer, and the outer periphery of the excavation mechanism is locked by the chuck device. A foundation pile construction device comprising a rotating cylinder and a holder that can be locked to the rotating cylinder in stages and capable of suspending a drilling rod.