JPH0913368A - Screw joint pile structure and method for constructing the same - Google Patents

Abstract

PURPOSE: To screw-threadedly engage an upper pile with a lower pile by means of a simple jig by a method wherein a thread of the same pitch as a thread of the lower pile is provided at the upper end of the upper pile, and a hanger is provided around a screw joint jig and a thread adapted to be threadedly engaged with the thread provided at the upper end of the upper pile is provided at the lower end of the upper pile. CONSTITUTION: For screw-threadedly engaging an upper pile 3 with a lower pile 1 using a tower 21, an external thread 8 of a screw joint jig 7 is threaded into an internal thread 5 of the pile 3 beforehand so as to be joined. And the jig 7 is attached to a hanger jig 20 through a hanger 9 on the ground and a motor-operated winch 22 is actuated to lift the pile 3 joined integral to the jig 7 and an external thread 4 is brought close to an internal thread 2 of the lower pile 1 and the winch 22 is stopped and the jig 7 is fixed to the tower 21 so as not to be rotated. And the pile 3 is rotated to thread the thread 4 into the thread 2 of the pile 1, whereby the pile 3 is drawn out from the jig 7 as the pile 3 rotates. Further the winch 22 is driven a little to lift the jig 7 connected, the pile 3, and the pile 1 altogether, and a hanger 6a is removed and the pile 1 and the pile 3 joined thereto are inserted into a hole formed in the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint pile structure in which a pile including a landslide prevention pile and a steel pipe pile and a steel pipe sheet pile (hereinafter collectively referred to as a steel pipe pile) which are jointed by a screw joint are screwed and joined. It relates to the construction method.

[0002]

2. Description of the Related Art In the construction of all threaded joint type steel pipe piles including landslide prevention steel pipe piles, when the screws provided on the upper pile are screwed into the screws provided on the lower pile, the upper piles are adjusted according to the pitch of the threads. It is necessary to slightly lower the stake.

FIG. 4 shows an example of a conventional method for constructing a threaded joint pile, in which 1 has a female screw 2 at the pile end (upper end), and is inserted into a hole provided in the ground to a temporary gantry 23. The held lower piles 3 are upper piles that have screws 4 on the ends (lower ends) of the piles and are screwed to the lower piles 1, and suspending metal fittings 6b are attached to the upper portions. Reference numeral 15 is a mobile crane, 16 is a suspension load meter, and a hook 19 is attached to the tip of a wire 18 drawn out along the jib 17, and a hanging tool 20 is hung on the hook 19.

When the upper pile 3 is screwed to the lower pile 1 by using the crane vehicle 15 as described above, first, the hanging metal fitting 6b of the upper pile 3 is attached to the suspending tool 20 by a wire or the like on the ground. 17 is moved up to position the upper pile 3 on the lower pile 1, and for example, the upper pile 3 is slightly lowered according to the pitch of the screws 2 and 4 while manually rotating the upper pile 3 by chain tongs, and 4 is screwed into the female screw 2 of the lower pile 1 to join them. In this case, the operator of the crane vehicle 15 is allowed to slightly descend the upper pile 3 under the communication of the operator of the crane vehicle 15 for suspending the upper pile 3 and the operator who screw-joins the upper pile 3. I depended on his arm. In addition, a suspension load meter 16 is provided in the driver's seat of the crane vehicle 15,
The driver was referring to this.

Since it is difficult to bring in a mobile crane at some sites, there is also a case where a turret 21 as shown in FIG. 5 is used for suspending a pile. In this case, since the upper pile 3 is operated by the electric winch 22, the suspension load cannot be controlled, and since it is difficult to make fine adjustments like a mobile crane, the work of screwing the upper pile 3 may not be successful. is there.

[0006]

As described above, in the joint pile work in the field including the landslide prevention pile, the upper pile must be rotated and slightly lowered at the time of screwing the upper pile. If the rotation of the upper pile and the slight drop were not synchronized, there was a risk that the screws would bite and the joint could not be made.

The present invention has been made to solve the above problems, and by using a simple jig, it is possible to reliably join a threaded joint pile in a short period of time without screw galling. The purpose is to obtain a pile structure and its construction method.

[0008]

[Means for Solving the Problems]

(1) The threaded joint pile structure according to the present invention has an upper pile having a screw having the same pitch as the screw of the lower pile at the upper end, and a hanging metal fitting on the outer periphery, and a screw provided at the upper end of the upper pile at the lower end. And a joint jig provided with a screw to be screwed into. (2) Further, the thread length of the thread portion of the joint jig of the above (1) is formed longer than the thread lengths of the thread portions of the lower pile and the upper pile.

(3) Further, in the method for constructing a threaded joint pile according to the present invention, the screw provided on the lower end of the joint jig is screwed on the screw provided on the upper end of the upper pile at the same pitch as the screw of the lower pile. After they are combined, they are lifted to restrain the joint jig from rotating, and then the upper pile is rotated and screwed to the lower pile.

[0010]

[Operation] The joint jig is screwed to the upper pile in advance at the factory or on site. Then, the joint jig integrated with the upper pile is lifted by a crane truck or the like so that the screw at the lower end of the upper pile faces the screw of the lower pile, and the joint jig is constrained so as not to rotate. Next, the upper pile is rotated using a chain tongue or the like, the screw of the upper pile is screwed into the screw of the lower pile, the upper pile is slightly lowered, and both are screw-joined. At this time, the upper pile begins to come out of the joint jig as it rotates, but even if the upper pile and the lower pile are screw-joined, the upper pile is still connected to the joint jig.

[0011]

【Example】

Embodiment 1 FIG. FIG. 1 is a schematic diagram for explaining the first embodiment of the present invention, FIG. 2 is an explanatory diagram of its action, FIG. 3 is the lower pile of FIG.
It is a perspective view of an upper pile and a joint jig. The same parts as those of the conventional example described in FIGS. 5 and 6 are designated by the same reference numerals,
Description is omitted.

Reference numeral 3 is an upper pile, and female threads 2 of the lower pile 1 are provided at the lower end.
A male screw 4 to be screwed in is provided, and a female screw 5 having the same pitch as the female screw 2 of the lower pile 1 is provided at the upper end portion. Numeral 7 is a joint jig, which is made of a steel pipe having substantially the same outer diameter as the lower pile 1 and the upper pile 3, and has the same pitch as the female thread 2, the male thread 4 and the female thread 5 of the upper pile 3 at the lower end. A male screw 8 is provided, and a hanging metal fitting 9 is attached to the outer periphery of the upper portion.
In addition, the length of the thread portion of the male screw 8 of the joint jig 7 is equal to that of the lower pile 1.
The internal thread 2, the upper screw 3, the external thread 4 and the internal thread 5 are formed to be longer than the threaded portions. However, the female screw 5 of the upper pile 3
The lower end portion of is continuous with a hollow portion having an inner diameter larger than the inner diameter of the female screw 5.

In this embodiment configured as described above,
For example, in order to screw-join the upper pile 3 to the lower pile 1 using the turret 21, the male screw 8 of the joint jig 7 is screwed into the female screw 5 of the upper pile 3 in advance in a factory or on-site to be joined. Keep it.
Then, the joint jig 7 is attached to the suspending tool 20 via the hanging metal fitting 9 on the ground, and the electric winch 22 is driven to move the upper pile 3 integrally joined to the joint jig 7 as shown in FIG. The electric winch 22 is lifted, the electric winch 22 is exposed to the female screw 2 of the lower pile 1, the electric winch 22 is stopped, the joint jig 7 and the upper pile 3 are held in that position, and the joint jig 7 is shown by a broken line, for example. Thus, it is restrained by the turret 21 and held non-rotatably.

Then, the upper pile 3 is rotated using, for example, a chain tongue, and the male screw 4 of the upper pile 3 is rotated to the female screw 2 of the lower pile 1.
Screwed in. At this time, since the joint jig 7 is restrained from rotating, the upper pile 3 begins to come out of the joint jig 7 as the joint pile 7 rotates. As described above, the male screw 8 of the joint jig 7 is the lower pile 1,
Since the screws 2, 4 and 5 of the upper pile 3 are formed at the same pitch, the upper pile 3 gradually comes out of the joint jig 7 at a speed equal to the speed at which it is screwed into the lower pile 1, and the fine amount required for screwing in. A descent is obtained, and the screw joining of both piles 1 and 3 is completed. At this time, the length of the thread portion of the male screw 8 of the joint jig 7 is formed longer than the length of the screw portion of the screws 2, 4, 5 of the lower pile 1 and the upper pile 3 as described above. The upper pile 3 and the joint jig 7 are still connected.

Then, the electric winch 22 is slightly wound up to raise the joint jig 7, the upper pile 3 and the lower pile 1 which are connected together, and the hanging metal fitting 6a attached to the lower pile 1.
Is removed and the lower pile 1 and the upper pile 3 joined thereto are inserted into the holes provided in the ground. Next, the lower pile 1 and the upper pile 3 are suspended from the temporary gantry 23 into the hole by using the suspension metal fittings 6b attached to the upper pile 3. Then, the joint jig 7 is rotated and removed from the upper pile 3. When the above work is completed, the joint jig 7
The male screw 8 is screwed into the screw to connect it to the upper end of another pile, and the electric winch 22 is wound again to hang up the joint jig 7 and the pile connected thereto, and the pile is connected to the above-mentioned procedure. Then, it is screwed to the upper pile 3. In this way, the continuous pile work is performed.

As described above, according to the present invention, by using the joint jig 7 having a simple structure, the female screw 2 of the lower pile 1 and the male screw 4 of the upper pile 3 are prevented from being galled. Can be smoothly screwed and joined in a short time. In the above description, the case where the upper pile 3 is joined to the lower pile 1 by using the turret 21 is shown, but the lower pile 1 and the upper pile 3 can be joined in the same manner even when the crane vehicle 15 is used. it can.

In the above description, the case where the present invention is mainly carried out when the steel pipe pile is screwed is shown. However, the present invention is also applied when the concrete pile having the screws at the upper and lower ends or the PC pile is screwed. It can be carried out. Also,
In the above description, the female screw 2 is provided on the upper end of the lower pile 1, the male screw 4 is provided on the lower end of the upper pile 3, the female screw 5 is provided on the upper end, and the female screw 8 is provided on the lower end of the joint jig 7. Although the example in which it is provided is shown, the female screw may be changed to a male screw, and the male screw may be changed to a female screw.

[0018]

【The invention's effect】

(1) The threaded joint pile structure according to the present invention has an upper pile having a screw having the same pitch as the screw of the lower pile at the upper end, and a hanging metal fitting on the outer periphery, and a screw provided at the upper end of the upper pile at the lower end. The upper pile can be screwed to the lower pile by a very simple jig because it is configured with a joint jig provided with a screw to be screwed into.

(2) Further, even if the thread length of the thread portion of the above-mentioned joint jig is formed longer than the thread portions of the lower pile and the upper pile, and the upper pile is screw-joined to the lower pile, the joint is fixed. Since the tool is adapted to be connected to the upper pile, it is possible to easily carry out the lifting of the connected upper pile and the lower pile and the insertion into the hole subsequent to the screw connection.

(3) Further, in the method for constructing a threaded joint pile according to the present invention, the screw provided on the lower end of the joint jig is screwed on the screw provided on the upper end of the upper pile at the same pitch as the screw of the lower pile. After fitting, it was lifted to restrain the joint jig from rotating, and then the upper pile was rotated and screwed to the lower pile, so that the upper pile can be slightly lowered at the same time as the rotation of the upper pile. It is possible to smoothly screw the upper pile to the lower pile without fear that an excessive load is applied to the joint portion or the screw is scuffed.

[Brief description of the drawings]

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

FIG. 2 is an operation explanatory view of FIG. 1;

3 is a perspective view of a lower pile, an upper pile and a joint jig of FIG. 1. FIG.

FIG. 4 is an explanatory diagram of an example of a conventional method for constructing a threaded joint pile.

FIG. 5 is an explanatory diagram of another example of a conventional method for constructing a threaded joint pile.

[Explanation of symbols] 1 Lower pile 2,5 Female thread 3 Upper pile 4,8 Male thread 7 Joint jig 6a, 6b, 9 Hanging metal fittings 15 Crane vehicle 20 Hanging tool 21 Turret 23 Temporary gantry

Claims (3)

[Claims] 1. A screw joint pile for joining a lower pile and an upper pile by screwing a screw provided on the lower pile with a screw provided on the upper pile, wherein a screw having the same pitch as the screw of the lower pile is provided at the upper end portion. A threaded joint pile, comprising: an upper pile having the above; and a fitting jig having a hanging metal fitting on the outer periphery and a lower end portion provided with a screw that is screwed with a screw provided at the upper end portion of the upper pile. Construction. 2. The threaded joint pile structure according to claim 1, wherein the thread length of the threaded portion of the joint jig is formed longer than the thread lengths of the threaded portions of the lower pile and the upper pile. 3. A threaded joint pile for joining a lower pile and an upper pile by screwing a screw provided on the lower pile with a screw provided on the upper pile, wherein the screw provided on the lower end of the joint jig is the upper pile. After being screwed to the screw provided at the same pitch as the screw of the lower pile at the upper end of the lower pile, the joint jig is rotatably restrained by lifting, and then the upper pile is rotated and screwed to the lower pile. A method of constructing a characteristic screw joint pile.