JP3364635B2 - Compacted piles such as high strength cast-in-place concrete piles and their connecting tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-resistivity cast-in-place concrete pile, a continuous underground wall, an embedded pile, etc. (hereinafter, collectively referred to as a high-resistivity cast-in-place concrete pile) with enhanced tip support force. And a connector used when the compaction pile is detachably connected to a penetration rod and penetrates into the tip ground.

[0002]

2. Description of the Related Art Conventionally, in the construction of cast-in-place concrete piles, it has been a problem that the tip support force is lowered due to the looseness of the tip ground due to excavation, and various improvement measures have been filed. For example, a method has been proposed in which a compaction pile is penetrated into the tip soil of the pile to compact the tip soil to obtain a large tip supporting force (the construction method described in Japanese Patent Publication No. 4-58847 of the prior application). reference).

Further, Japanese Patent Application Laid-Open No. 4-302614 of the prior application describes an improved structure of the compaction pile for enhancing the tip supporting force. That is, as shown in FIG. 6, a compaction pile a manufactured by a cast iron or cast steel casting method or the like.
Is provided with an elongated injection hole b penetrating from the top to the bottom along the center line for ejecting cement milk or the like from the tip. Further, a connecting portion d connected to the penetrating rod is provided on the upper end portion. Therefore, the ejection of cement milk or the like is configured such that the lower end of the penetrating rod is connected to the connecting portion d and the penetrating rod is injected through the injection hole b in the compacting pile a. A tip cutter e and a spiral ridge f for improving the penetration into the tip ground are attached to the tip of the compaction pile a.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The compaction pile according to No. 2614 can smoothly penetrate into the tip ground by rotationally press-fitting, cement milk or the like can be injected into the tip ground through the injection hole b, and the penetrating rod is disconnected from the connection part d by the reverse rotation or the like, and the tightening is performed. It has an excellent function such that only the compaction pile a is left in the tip ground to surely obtain the compaction effect of the tip ground.

However, in order to have a function of ejecting cement milk or the like to the compaction pile a, it is necessary to purposely provide an injection hole b for cement milk or the like in the central portion of the compaction pile a, and the top surface of the production method by the casting method is overturned. It's annoying. Moreover, most of the main body portion c other than the elongated injection hole b is occupied by cast iron or cast steel, which requires material cost and is very heavy. In addition, there is a problem in that a connecting portion d, which is indispensable for connecting the penetrating rod, is manufactured and provided, and the entire length of the pile is increased by the amount corresponding to the connecting portion d, which causes a problem of cost increase. In short, the conventional compaction pile a
In terms of its function, the internal structure is complicated and the manufacturing is troublesome, and due to the complicated structure, it is heavy and long and difficult to handle, and the manufacturing cost of the compaction pile a is inevitably increased. , Has become a problem to be solved.

Therefore, an object of the present invention is to further improve the compaction pile according to Japanese Patent Application Laid-Open No. 4-302614 (Japanese Patent Application No. 3-65839), and to simplify and lighten the internal structure of the compaction pile. It is an object of the present invention to provide a compaction pile whose manufacturing cost is reduced and a connector suitable for using the compaction pile.

[0007]

As means for solving the above-mentioned problems, a compacting pile 1 such as a high-strength cast-in-place concrete pile according to the first invention is, as shown in FIG. 1 and FIG. The shape is formed in a tapered shape, and a hollow portion 5 having an upper opening into which the connecting member 3 of the penetrating rod 2 can be fitted is formed in the inside thereof, and the lower end portion of the hollow portion 5 is provided with An injection hole 6 for cement milk or the like connected to the injection hole 4 is provided, and a plurality of rotated projections 7 connected to the connecting tool 3 and transmitting a rotational force are provided in the vertical direction in the upper portion.

Further, as shown in FIGS. 2 to 4, a connector 3 such as a high-strength cast-in-place concrete pile according to the second invention connects the compaction pile 1 to the penetrating rod 2 as shown in FIGS. A connecting tool 3 used when the pile 1 penetrates into the tip ground, and the overall shape is formed into a rod-like body, and the axial direction of the central portion thereof.
The cement milk or the like injection hole 4 for injecting formed through the hollow upper opening compaction pile 1 to a position above the outer peripheral surface
Part and the rotation transmitting projection 8 which transmits the rotational force to the rotating projection 7 provided in 5 provided more in the vertical direction, the lower position of the rotation transmission projections 8 of the rotating projection 7 of the compaction pile 1 Along with the hanging portion 9 hooked at the lower end portion, a plurality of inclined reinforcing protrusions 10 are provided vertically in close contact with each other along the inner surface of the tapered taper portion 1a of the compacting pile 1, and a connecting portion for connecting the penetrating rod 2 to the upper end portion.
The connecting part 15 is provided .

[0009]

The compaction pile 1 does not require most of the injection holes for injecting cement milk or the like, and the inside of the compaction pile 1 is formed in the hollow portion 5 and thus becomes the material of the compaction pile 1. The amount of cast iron or cast steel can be reduced as much as possible, the weight is light, the manufacturing cost is reduced, and the handling is convenient. Moreover, the internal structure of the compaction pile 1 (hollow portion 5) is a simplified structure in which only the rotated projection 7 is provided and the number of parts is small, so that the mold is simple even when manufactured as a cast product. It is easy to manufacture and easy to manufacture (Fig. 1). Further, unlike the conventional case, it is not necessary to purposely provide the connecting portion of the penetrating rod, and the pile length can be shortened and lightened accordingly.

Since the rotated projection 7 of the compacting pile 1 is connected to the rotation transmitting projection 8 of the connecting tool 3 and the rotational force is transmitted, the compacting pile 1 is surely inserted into the tip ground by rotational press fitting. . After the penetration, the connector 3 is compacted and separated from the pile 1, so that the connector 3 can be easily pulled up and collected, and can be used repeatedly. Most of the function of the injection pipe for injecting cement milk or the like is received by the injection hole 4 of the connector 3 (FIG. 2B), and the cement milk is injected from the ejection hole 6 of the compacting pile 1 through the injection hole 4. Etc. are reliably ejected into the tip ground (Fig. 4), so there is no obstacle to the realization of a strong compaction ground.

[0011]

EXAMPLES Next, examples of compaction piles such as high-proof cast-in-place concrete piles shown in the drawings will be described. FIG. 1 shows an overall view of a compaction pile 1. This compaction pile 1 penetrates into the tip ground by using a guide rod or the like installed in an excavation hole (not shown) by using a penetration rod or the like when constructing a high-strength cast-in-place concrete pile, etc. Harden,
Used to enhance tip bearing capacity.

The compaction pile 1 is manufactured mainly as a cast product of cast iron or cast steel, and its overall shape is a tapered taper with a slope of about 1/5 to 1/20 in consideration of the penetration performance into the tip ground. It is formed into a shape. Most of the inside (about 2 / of the total length)
The portion corresponding to 3) is formed as a hollow portion 5 having an opening at a size large enough to fit the connector 3 as shown in FIG. 2 from above (on the ground) (see FIG. 4). The peripheral taper portion 1a forming the hollow portion 5 is made of cast iron or the like having a minimum necessary thickness as having strength enough to withstand earth pressure, and the material cost is greatly increased by that amount. It has been saved and lightened. An injection hole 17 for cement milk (or mortar, concrete, etc.), which is connected to an injection hole 4 of a connector 3 described later, is provided at the lower end of the hollow portion 5.
And the ejection hole 6 opened to the outside is provided. Further, on the inner surface of the upper portion of the hollow portion 5, a plurality of rotated projections 7 are provided in the vertical direction, which are coupled to the coupling tool 3 and transmit the rotational force. In other words, the compaction pile 1 has almost no injection hole for cement milk injection, and has a very simple structure in which only the rotated projection 7 is provided, so that it is manufactured as a cast product. Also in this case, the structure of the mold is simplified and the manufacturing is simple, and the material and the manufacturing cost are significantly reduced.

Reference numeral 12 in FIG. 1 is the compaction pile 1 concerned.
Is a plurality of tip cutters protruding forward from the tip surface and installed on the outer peripheral surface of the compacting pile 1, and reference numeral 13 is a spiral ridge installed directly above the tip cutter 12. Further, reference numeral 14 is a plurality of side surface cutters which are located immediately above the spiral ridges 13 and are installed at the same level as the cement milk ejection holes 6. It is provided in order to improve the penetration of the compaction pile 1 into the tip ground. That is, the tip cutter 12
The sand pile or the like is rotationally excavated by the so-called screw action of the spiral protrusion 13 and the peripheral excavation of the peripheral ground by the side cutter 14, so that the compaction pile 1 is smoothly penetrated into the tip soil.

Next, a connecting member such as a high-proof cast-in-place concrete pile will be described. FIG. 2 shows the overall structure of the connector 3. The connecting tool 3 is used by being connected to the tip end portion of the penetrating rod 2, and is connected to the compacting pile 1 such as the high-proof cast-in-place concrete pile or the like to penetrate the compacting pile 1 into the tip ground. However, it is preferably used when pouring cement milk. The overall shape of the connector 3 is the above-mentioned compaction.
The pile 1 is formed into a rod-shaped body having an outer diameter and a length that can be fitted exactly into the hollow portion 5 of the upper opening of the pile 1, and the upper end portion thereof is provided with a connection portion 15 connectable to the lower end of the penetrating rod 2. ing. In the axial direction of the central part of the connecting tool 3,
An injection hole 4 for injecting cement milk is formed penetrating from the connection portion 15 at the upper end to the lower end (FIG. 2B). A packing 16 is provided at the lower end of the injection hole 4. In addition, at a position above the outer peripheral portion of the connecting portion 3, the rotation transmitting projection 8 for transmitting the rotational force to the rotated projection 7 of the compaction pile 1 is vertically arranged with a length corresponding to approximately ½ of the entire length. A plurality is provided in the direction (FIG. 2A). Below the rotation transmitting projection 8, the inclined reinforcing projection 10 is closely contacted with the rotation transmitting projection 8 along the tapered portion 1a of the compaction pile 1.
Are provided in the vertical direction. The reinforcement protrusions 10 are provided to reinforce the tapered portion 1a of the compaction pile 1 from the inside so as not to be damaged by the earth pressure of the surrounding ground when the compaction pile penetrates. In addition, this reinforcing protrusion 1
At a position of 0 in the counterclockwise direction, a suspension portion 9 hooked on the lower end portion of the rotated projection 7 of the compaction pile 1 is formed to project (see FIG. 3).

Therefore, as ground work, the connector 3 connected to the penetrating rod 2 is inserted into the hollow portion 5 of the compacting pile 1 from above, and the lower end of the connector 3 contacts the lower end of the hollow portion 5. When it comes into contact with the compaction pile 1 and is turned counterclockwise a little, the suspension portion 9 of the connector 3 is hooked on the lower end of the rotated projection 7 of the compaction pile 1 to support the compaction pile 1. In this state, after the compaction pile 1 is lowered onto the drilling ground (not shown), the compaction pile 1
Rotate clockwise to penetrate the tip ground. Since the rotated projection 7 of the compaction pile 1 is connected to the rotation transmitting projection 8 of the connecting tool 3 to transmit the rotational force, the compaction pile 1
Is surely penetrated into the tip ground by rotating press fit. After the penetration is completed, cement milk is injected into the tip soil. At this time, the cement milk is ejected from the compaction pile 1 from the injection hole 20 of the penetration rod 2 through the injection hole 4 of the connector 3 and the injection hole 17 of the compaction pile 1 as shown in FIG. It is surely ejected from the hole 6 into the tip ground. The function as an injection pipe necessary for injecting the cement milk is configured such that only the injection hole 4 of the connecting tool 3 is responsible for it. After the cement milk is injected, the connecting rod 3 can be easily separated from the compacting pile 1 by pulling up the penetrating rod 2, and can be pulled up and collected for repeated use. Thus, the high-proof cast-in-place concrete pile or the like having the tip supporting force enhanced by the inexpensive compacting pile 1 can be constructed at low cost.

[0016]

[Different Embodiment] FIG. 5 shows a large compaction pile 1'having a long overall length.
It shows an example in the case of being implemented as. That is, the compaction pile 1'has a structure in which the enlarged diameter portion indicated by the symbol L is further extended to the upper end of the taper portion 1a of the compaction pile 1 of the above embodiment. Other configurations are exactly the same as those of the compaction pile 1. Cement milk can be ejected using the connecting tool 3 having the above-mentioned configuration as it is (Fig. 5).
B), and the same effect as that of the above-described embodiment is obtained. Especially,
Compared with the conventional compacted pile of approximately the same size, the material cost of the hollow portion 5 is greatly reduced, the weight is light and the handling is easy.

[0017]

EFFECTS OF THE INVENTION The compaction piles such as high-resistivity cast-in-place concrete piles according to the present invention and the connecting tool thereof provide high-strength cast-in-place concrete piles having a large tip supporting force due to the compacting effect of the compacted piles. Contributes to a significant reduction in the cost of compaction piles during the construction of. Of course, cement milk or the like is surely injected into the tip ground to enhance the tip supporting force of the piles and the like, which contributes to construction of a structure having high workability, quality, and reliability.

[Brief description of drawings]

FIG. 1 is an overall view of a compaction pile.

2A and 2B are an overall view of the coupling tool and a cross-sectional view taken along the line AA ′ of FIG.

FIG. 3 is a sectional view taken along the line BB ′ of FIG. 2A.

FIG. 4 is an overall view showing a joined state of a compaction pile and a connecting tool.

5A and 5B are general views showing different compaction piles.

FIG. 6 is a front view showing a conventional example.

[Explanation of symbols]

1 Compaction pile 2 Penetration rod 3 connector 4 injection holes 5 Hollow part 6 spout holes 7 Rotated protrusion 8 Rotation transmission protrusion 9 hanging parts 10 Reinforcing protrusion 1a taper part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kiyoshi Yamashita Kiyoshi Yamashita 2-5-14 Minamisuna, Koto-ku, Tokyo Inside the Takenaka Corporation Technical Research Institute (72) Inventor Tomio Tsuchiya 2-5-14 Minamisuna, Koto-ku, Tokyo No. Stock Company Takenaka Corporation Technical Research Institute (72) Inventor Makoto Nagasokabe 2-5-14 Minamisuna, Koto-ku, Tokyo Stock Company Takenaka Corporation Technical Research Institute (72) Takeshi Yamada 2 Minamisuna, Koto-ku, Tokyo 5-14 No. 14 Takenaka Corp. Technical Research Institute (56) Reference Japanese Patent Laid-Open No. 4-213616 (JP, A) Sekikai Sho 60-195330 (JP, U) Japanese Patent Sho 55-50132 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 5/34 E02D 5/72

Claims (2)

(57) [Claims] 1. A compaction pile used for construction of high-proof cast-in-place concrete piles, etc., wherein the overall shape is formed in a tapered shape, and an upper opening into which a connector for a penetrating rod can be fitted from above. A hollow portion is formed, a jet hole of cement milk or the like connected to the injection hole of the connector is provided at the lower end of the hollow portion, and the upper portion is connected to the connector and the rotational force is transmitted. A compaction pile, such as a high-strength cast-in-place concrete pile, characterized in that a plurality of rotated projections are provided in the vertical direction. 2. A connecting tool used when connecting a compaction pile such as a high-strength cast-in-place concrete pile to a penetrating rod and penetrating the compacting pile into the tip ground, the overall shape of which is a rod-like body. is formed, the rotation protrusions its injection hole in the axial direction to inject the cement milk or the like of the central portion penetrates are formed, the upper position of the outer peripheral surface provided in the hollow portion of the upper opening of the compaction pile A plurality of rotation transmitting protrusions for transmitting the rotational force to the vertical direction are provided in the vertical direction, and a lower portion of the rotation transmitting protrusion is provided with a suspension portion hooked to the lower end of the rotated protrusion of the compacting pile and the compacting pile. Highly proof place, characterized in that a plurality of inclined reinforcing protrusions that are closely contacted with each other along the inner surface of the tapered taper portion are provided in the vertical direction, and a connection portion to which the penetrating rod is connected is provided at the upper end portion. Connecting tools such as poured concrete piles.