JPS61237719A - Laying work of supporting pile - Google Patents

Abstract

PURPOSE:To prevent the ununiform settlement of piles by a method in which a supporting pile is buried in a penetrating pit through an outer tube after the outer tube is buried, and the head of the pile is pressed by an oil-pressure jack fixed to the upper end of the outer tube. CONSTITUTION:Rings 6 are fixed in a multistage on the outside of paired shells 5 and both ends of the rings 6 are connected to both ends of paired oil-pressure jacks 7 facing each other to form an outer tube 4. A penetrating pit 3 for a supporting pile is drilled below a penetrating pit 2 for the outer tube, the tube 4 is penetrated into the hole 2, and a pile 1 is penetrated into the hole 3. The jacks 7 are extended to expand the opening of the tube 4, and the periphery of the tube 4 is pressingly contacted with the inner wall of the pit 2. An oil- pressure jack 10 is placed on the head of the pile 1 and fixed, and the pile 1 is pressed and penetrated by operating the jack 10.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a noiseless burying method for concrete piles, and in particular to a method for preventing immobility and settling of piles that occur after burying a support pile in a hole excavated by an earth auger. The purpose is to prevent

[Conventional technology]

For the purpose of silently burying support piles, a method for burying support piles in which a borehole is previously dug with an auger to a specified support layer and the support pile is inserted into the borehole has been widely known. There is.

However, in this construction method, the bottom end of the pile cannot be sufficiently press-fitted into the supporting ground by means such as hammering without simply sliding the support pile into the hole excavated by the auger, so the bottom of the hole must be sufficiently dredged. If residual earth and sand are left behind, there is a problem in that the support piles that are later penetrated will sink by the thickness of the residual earth and sand due to the weight of the superstructure.

[Problem that the invention seeks to solve]

This method of burying support piles using an auger drill hole has the problem that it is difficult to press the lower end of the support pile into the support ground layer, so it is difficult to simply bury the support piles after the hole has been drilled. After penetration, it is necessary to pressurize the support pile by some means to ensure that the remaining earth and sand at the bottom of the hole is sufficiently consolidated to the extent that no immobility or settlement will occur later. As a means of pressurizing such piles, the conventional method of pounding the piles is said to be the most preferable method, but it cannot be used because it generates noise. There is a problem in that it is not possible to expect sufficient soil consolidation at the lower end of the pile because the soil is transmitted into the surrounding ground through the buried part of the pile.

[Means for solving problems]

The present invention is a means for solving the above-mentioned problems in the method of embedding support piles in an auger excavation hole. An outer pipe that is larger than the outer diameter of the support pile and whose outer circumferential surface has good adhesion to the insertion ground is buried, and after burying this outer pipe, the support pile is embedded in the penetration hole, and the outer diameter of the outer pipe is A hydraulic jack fixed to the upper end pressurizes the head of the support pile using the pull-out resistance of the outer tube, thereby press-fitting the lower end of the desk to a depth that will not cause immobility and settlement.

[Effect]

In the construction method according to the present invention, an outer pipe with good consolidation property is buried in advance in the insertion ground with a diameter larger than the outer diameter of the support pile in the same ground outside the buried part of the support pile. After penetrating into the borehole excavated by the auger, a hydraulic jack placed on the upper end of the support table is connected to the upper end of the outer tube.

In this state, when pressing force is applied to the upper end of the support pile by the hydraulic jack, the reaction force applied from the support pile to the hydraulic jack is canceled by the pull-out resistance force due to the close contact of the outer pipe with the surrounding ground, and the outer pipe The lower end of the support pile can be press-fitted to a position where the remaining earth and sand at the bottom of the excavation hole is sufficiently consolidated by the pressing force of the hydraulic jack using the reaction force of the support pile.

〔Example〕

Next, the burying method of the present invention will be explained with reference to an embodiment shown in the drawings. As shown in FIG. Drill the tube insertion hole 2. Although the depth of the outer pipe insertion hole 2 varies depending on the soil quality of the construction site, it is preferably approximately half the design drilling depth of the support pile 1 to be buried later, but slightly longer than that.

Next, as shown in the figure, a support pile penetration hole 3 coaxial with the outer tube insertion hole 2 is excavated below the outer tube insertion hole 2 to a predetermined design depth using an auger for burying the support pile.

After drilling the support pile penetration hole 3, the outer tube 4 is inserted into the outer tube insertion hole 2 as shown in FIG. 1C. As shown in FIGS. 2 and 3, the outer tube 4 is made up of a pair of circular diameter shells 5, each of which is a steel tube of a predetermined length and diameter and is divided into two along its length.

In addition, this outer tube 4 has semicircular rings circumferentially fixed in multiple stages at the same position on the outside of each, and both shells 5
Both ends of the ring 6 at the joint position are connected to both ends of a pair of opposing hydraulic jacks 7. Therefore, normally, each hydraulic jack 7 contracts and the outer diameter of the outer tube 4 becomes large enough to be inserted into the outer tube insertion hole 2.
After inserting this outer tube 4 into the outer tube insertion hole 2, by extending the hydraulic jack 7 by operation from the ground, the diameter of the outer tube 4 is expanded inside the insertion hole 2 as shown in Fig. 4. It has a structure like this.

The outer tube 4 shown in FIGS. 2 to 4 has a shell 5 divided into two parts.
However, if the diameter is such that it can be expanded in the outer tube insertion hole 2, two hydraulic jacks can be used as a means for expansion. The present invention is not limited to the jack 7; for example, as shown in FIG. There may be.

As shown in Fig. 1C, the outer pipe 4 is inserted into the outer pipe insertion hole 2 with a small diameter, and the support pile 1 is inserted into the support pile penetration hole 3 as shown in Fig. 1D. . As can be seen from Figure d, even if this penetration hole 3 is excavated to a predetermined design depth by an auger, there is dirt and debris spilled from the auger blade during excavation at the inner bottom of the support pile penetration hole 3. 9 etc. are deposited. These earth and sand 9 cannot be sufficiently compacted by simply inserting the support pile 1 into the penetration hole 3, and when a structure is later built on the support pile 1, it is compacted by the load of the structure. This will cause the structure to settle due to immobility.

After the support pile 1 is inserted into the penetration hole 3, the hydraulic jack 7 of the outer tube 4 is extended by operating from the ground to widen the diameter of the outer tube 4, as shown in Fig. 1e. By crimping the outer peripheral surface to the inner wall surface of the outer tube insertion hole 2, the adhesion of the outer tube 4 to the insertion hole 2 is made extremely strong.

After the diameter of the outer pipe 4 has been expanded and crimped to the ground, a hydraulic jack 10 is attached to the pile cap of the support pile 1 as shown in the same figure e.
is placed, and the support arm 11 of the hydraulic jack 10 is locked and fixed to the upper end of the outer tube 4. In this state, when the pressing force from the hydraulic jack 10 is transmitted to the support pile 1 as shown in FIG. A pressure is applied to the support pile 1 which is counteracted by the resistance and sufficiently compacts the earth and sand 9 at the lower end, and the penetration length to the design depth is determined by measuring the amount of settlement under load.

After the penetrating process of the support pile 1 is completed, each hydraulic jack 7 that had expanded the shell 5 of the outer pipe 4 is contracted to reduce the diameter of the outer pipe.
Pull out the outer tube 4 to the ground.

FIG. 6 shows another practical example. In this case, the outer tube 14 is not divided into two, but a spiral rib 16 is fixedly provided around the outer periphery of a steel pipe of a predetermined diameter as shown in FIG. At the same time, the structure is such that a cutting edge I5 is provided at the lower end.

When using this outer tube 14, it can be buried to a predetermined depth by press-fitting the outer tube 14 while being rotated by an auger rotating machine. As shown in the figure, the outer pipe 14 is buried in the ground around the center of the penetration hole 3, and then the support pile l is penetrated into the penetration hole 3 as shown in the figure C. As in the case of the spiral rib 1 on the outer tube 14
The pulling resistance force based on the consolidation adhesion between the pile head 6 and the ground is used as a reaction force of the pile head hydraulic jack 10 to apply a predetermined pressing force to the support pile 1. In this case, the spiral outer tube 14 is pulled out by pulling up the outer tube 14 while rotating it in the opposite direction after the embedding process of the support pile 1 is completed.

〔result〕

The method of burying a support pile according to the present invention is to prevent immobility and sinking of the support pile due to consolidation of the remaining soil at the bottom of the hole after the support pile is penetrated and buried by an auger. In order to bury an outer tube that can maintain good adhesion and use the pull-out resistance of this outer tube as a pressurizing reaction force for the head jack, a pressurizing force that can sufficiently consolidate the remaining soil at the bottom of the hole is applied to the support pile 1. can be given without noise,
This has the effect of reliably preventing the support pile from settling due to the load of the structure.

[Brief explanation of drawings]

Fig. 1 is a process explanatory diagram showing one embodiment of the construction method according to the present invention, Fig. 2 is a plan view of an outer pipe used in the method, and Fig. 3 is a plan view of an outer pipe used in the method.
The figure is a partially cutaway side view, FIG. 4 is a plan view with the diameter expanded, FIG. 5 is a plan view showing another embodiment of the outer pipe, and FIG. 6 is another example of the construction method according to the present invention. FIG. 7 is a perspective view of an outer pipe used in the construction method of FIG. 6. 1...Support pile 2...Outer tube insertion hole 3...Support pile penetration hole 4...Outer tube 5...Shell 6...Ring 7...Hydraulic jack for expansion 8...・Hinge 9...
Residual earth and sand 10... Hydraulic jack for pressurization 11... Support arm 14... Outer pipe 15... Cutting blade 16...
Spiral rib patent applicant Kodama Concrete Industry Co., Ltd. Representative Patent attorney Takeshi 1) Kenichi FIG・2
FIG, 3FIG, 4
FIG, 5FIG, 6 FIG, 7

Claims (4)

[Claims] (1) Prepare an outer layer of ground around the support pile that is to be penetrated into the hole excavated by the auger with a surface that is larger than the outer diameter of the support pile and that has good adhesion to the insertion ground. After burying the outer tube, a support pile is buried in the penetration hole, and a hydraulic jack fixed to the upper end of the outer tube applies the head of the support pile using the pull-out resistance of the outer tube. A support pile burying method characterized by pressing the lower end of the pile into the pile to a depth that will not cause settling. (2) After the outer pipe is buried in the ground through an outer pipe insertion hole with an inner diameter larger than the diameter of the support pile penetration hole, the pipe diameter is expanded by extending a horizontal hydraulic jack installed on the wall of the outer pipe. 2. The method for burying a support pile according to claim 1, wherein the outer pipe and the ground into which it is inserted can be consolidated. (3) By burying the outer pipe with spiral ribs on its outer circumference in the ground around the support pile penetration hole while applying pressure and rotation, the outer pipe and the inserted ground can be consolidated. A method for burying a support pile according to claim 1. (4) Claims 1 to 3 in which the outer pipe is a steel pipe
Burying method of supporting piles as described in section.