JP7437237B2 - Pile press-in method, joint scraper and press-in piles - Google Patents

Description

The present invention relates to a pile press-in construction method for press-fitting into the ground a pile having a joint that connects two adjacent sides of each other, and a joint scraper and press-in pile related thereto.

A continuous pile wall is constructed by press-fitting two adjacent piles having joints that connect the side parts of each other into the ground.
The pile is a steel sheet pile or other type of pile, and the joint is a connection structure in which the mating part of the other joint is inserted in the longitudinal direction into a mating groove that extends in the longitudinal direction of the pile and communicates with the side opening. has. Then, a pile connection press-fitting process is carried out in which the joint of the construction pile is fitted into the joint of the existing pile that was previously press-fitted into the ground, and the construction pile is press-fitted.
When a pile is press-fitted into a fine sand layer with a typical grain size, the soil that has entered the fitting groove of the joint of the existing pile that has been press-fitted into the ground first becomes dehydrated and solidified as the construction pile is driven in, causing the joint to become trapped between the joints. Increase resistance. This is called the "wedge phenomenon."
When the wedge phenomenon occurs, the resistance between the joints increases at an accelerating rate, causing deformation of the joints, which eventually leads to the joints becoming unfitted and uncoupled, which significantly reduces the efficiency of pile construction work.
Patent Documents 1 and 2 describe scrapers for steel sheet pile joints to prevent such a wedge phenomenon.
If such an earth removal tool is used, in the pile connection press-fitting process, the earth removal tool is inserted through the end surface opening on the ground side of the fitting groove of the existing pile, and the earth removal tool is inserted through the end surface of the fitting part of the construction pile. By pushing the rear end surface, earth can be scraped out from the fitting groove to the side opening.

Jitszenhei 01-037537 publication Jitszen No. 59-160635

However, even with the above-mentioned conventional technology, there is a risk that earth and sand may be caught between the earth ejecting tool and the fitting groove and become consolidated.

The present invention has been made in view of the above-mentioned problems in the conventional technology, and an object of the present invention is to effectively remove earth from the joints of existing piles, reduce the resistance between the joints, and improve the efficiency of pile connection press-in construction. shall be.

One aspect of the present invention is a pile press-in method of press-fitting into the ground a pile having a joint that connects the side parts of two adjacent piles, wherein the joint extends in the longitudinal direction of the pile and the side part of the pile It has a connection structure in which the mating part of the mating joint is inserted in the longitudinal direction into the mating groove that communicates with the opening, and the joint of the constructed pile is fitted into the joint of the existing pile that has been press-fitted into the ground first. The method includes a pile connection press-fitting step in which the construction pile is press-fitted while the pile is connected, and in the pile connection press-fitting step, a joint part earth removal scraper is inserted from the end face opening on the ground side of the fitting groove of the existing pile, and the construction pile is By pushing the rear end surface of the joint soil removal scraper with the tip end surface of the fitting portion of the pile, soil is scraped out from the fitting groove toward the side opening, and A recessed portion is formed on a side surface facing the inner wall surface of the fitting groove to maintain a space apart from the inner wall surface.

According to one aspect of the present invention, it is possible to effectively remove earth from joints of existing piles, reduce resistance between joints, and improve the efficiency of pile connection press-in construction.

It is a side view of a joint part and a joint part earth removal scraper concerning a 1st embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1. FIG. FIG. 3 is a side view of the joint portion earth removal scraper taken in the direction of arrow C shown in FIG. 2; FIG. 3 is a side view of the joint portion earth removal scraper as viewed from arrow D shown in FIG. 2; It is a side view of the joint part earth removal scraper based on 2nd Embodiment of this invention. 6 is a cross-sectional view taken along line EE shown in FIG. 5. FIG.

An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and is not intended to limit the present invention.

[First embodiment]
First, a first embodiment of the present invention will be described. Figures 1 and 2 show the existing piles, the constructed piles, and the joint scraper during the pile connection press-in process. FIG. 1 is a side view of the joint. FIG. 2 corresponds to the AA cross section. FIG. 1 corresponds to a view B shown in arrow direction. FIG. 3 corresponds to a view shown by arrow C, and FIG. 4 corresponds to a view shown by arrow D. However, FIGS. 3 and 4 are individual views of the joint portion earth removal scraper.

As shown in FIGS. 1 and 2, a joint is connected to an existing pile 1 and a construction pile 2 is connected, and a pile connection press-fitting process is carried out using a joint scraper 3.
The existing pile 1 and the construction pile 2 are the same steel sheet piles, and have joints 10 and 20 that connect two adjacent sides of each other. According to the pile press-in method of this embodiment, the existing piles 1 are first press-fitted into the ground.

The joint 10 of the existing pile 1 and the joint 20 of the construction pile 2 fit into each other.
As shown in FIG. 2, the joint 10 includes a first wall portion 11, a second wall portion 12 bent and extending from the first wall portion 11, and a third wall portion bent and extended from the second wall portion 12. A fitting groove 14 is formed inside the portion 13. A part of the fitting part 13 is a retaining part 13a. A gap between the first wall portion 11 and the retaining portion 13a is a side opening 15. The portion that makes the side opening 15 narrower than the inside of the fitting groove 14 is the retaining portion 13a.
The joint 20 has a similar structure, and corresponds to the joint 10 rotated by 180° in FIG. The fitting portion 23 of the joint 20 fits into the fitting groove 14 of the joint 10.
The joint 10 is fitted by inserting the fitting portion 23 of the counterpart joint 20 in the longitudinal direction of the pile into a fitting groove 14 extending in the longitudinal direction (vertical direction in FIG. 1) and communicating with the side opening 15. It has a connecting structure. A similar fit holds true when viewed from the joint 20.

After the press-fitting of the existing pile 1 is completed, a pile connection press-fitting process is carried out in which the constructed pile 2 is press-fitted while the joint 20 of the constructed pile 2 is fitted into the joint 10 of the existing pile 1.
In this pile connection press-fitting process, the joint soil removal scraper 3 is inserted from the end face opening on the ground side of the fitting groove 14 of the existing pile 1, and the joint soil removal scraper By pushing the rear end surface 31 of 3, soil is scraped out from the fitting groove 14 to the side opening 15.
The tip edge 32 of the joint portion soil removal scraper 3 corresponds to the ridgeline between the rake face 33 and the flank face 35. The earth and sand in the fitting groove 14 is scraped off from the inner wall part of the second wall part 12 by the rake face 33 through the side opening 15.

In this embodiment, the joint scraper 3 has three side surfaces 34, 35, and 36. One of them is the flank 35.
The inner wall surface of the fitting groove 14 is constituted by the inner wall surface of the first wall portion 11 , the inner wall surface of the second wall portion 12 , and the inner wall surface of the fitting portion 13 .
In the pile connection press-fitting process, the side surface 34 faces the inner wall surface of the first wall portion 11 , the side surface (flank surface) 35 faces the inner wall surface of the second wall portion 12 , and the side surface 36 faces the inner wall surface of the fitting portion 13 . Facing the wall.
Among these side surfaces, recesses 37, 38, and 39 are formed on the side facing the inner wall surface of the fitting groove 14 to maintain a space apart from the inner wall surface. A space is maintained between the inner wall surface and the recesses 37, 38, 39.
In this embodiment, the recesses 37, 38, and 39 are provided on a plurality of side surfaces 34, 35, and 36 that face the inner wall surface of the fitting groove 14 and have different directions. Furthermore, the recesses 37, 38, and 39 are provided on all the side surfaces 34, 35, and 36 that face the inner wall surface of the fitting groove 14 and have different directions. Recesses 37, 38, 39 are formed in the three side surfaces 34, 35, 36, respectively.

Therefore, in the pile connection press-fitting process, when the joint earth removal scraper 3 removes earth from the fitting groove 14 of the existing pile 1, the side surfaces 34, 35, 36 of the joint earth removal scraper 3 and the inside of the fitting groove 14 are removed. Even if earth and sand enters between the wall surface and the wall surface, the particles that can enter are small and few, so they are prevented from entering the space held by the recesses 37, 38, and 39 and solidifying. Further, the soil that has entered is discharged upward from the joint soil removal scraper 3.
As described above, consolidation of earth and sand in the fitting groove 14 is avoided, so earth is effectively removed from the joint 10 of the existing pile 1, reducing resistance between the joints and making pile connection press-in construction highly efficient. be able to.

The recesses 37, 38, and 39 are not cut out to the edges in the direction of the distal end of the joint soil removal scraper 3, but are accommodated within the respective side surfaces 34, 35, and 36, leaving edges on the respective side surfaces. This is to prevent earth and sand from entering from the tip side of the joint portion soil removal scraper 3 as much as possible.

The recesses 37 and 38 are continuous to the rear end surface 31, that is, cut out to the edges of the respective side surfaces 34 and 35. This makes it easier to discharge the earth and sand that has entered the recesses 37 and 38 upward.

On the other hand, the recess 39 is not continuous to the rear end surface 31, that is, it is not cut out to the edge of the side surface 36, but is accommodated within the side surface 36, leaving an edge on the side surface 36. Therefore, in the rear end portion 40 of the joint portion earth removal scraper 3, a recessed portion is eliminated at a portion that engages with the retaining portion 13a adjacent to the side opening 15 of the fitting portion 13. This ensures a retaining shape that prevents the joint soil removal scraper 3 from leaving the side opening 15.
That is, by forming the recess on the side surface of the joint soil removal scraper 3, the joint soil removal scraper 3 does not easily slip out of the fitting groove 14.
Therefore, in the pile connection press-fitting process, the joint part soil removal scraper 3 does not separate from the fitting groove 14, and the effect can be exhibited.

The recess 39 is continuously formed from a portion facing the inner wall surface of the fitting groove 14 (inner wall surface of the fitting portion 13 ) to a portion facing the side opening 15 .
Thereby, the earth and sand that has entered the recess 39 can be easily discharged to the outside from the side opening 15.
In this case, a structure may be implemented in which the recess 37 and the recess 39 are connected and integrated. Earth and sand that has entered the recesses 37 and 39 can be easily discharged to the outside from the side openings 15.

In the joint portion soil removal scraper 3, the angle formed by the flank surface 35 and the rear end surface 31 is larger than 90 degrees.
In the pile connection press-fitting process, the tip surface 23a of the fitting portion 23 of the construction pile 2 biases the contact portion 41 near the side opening 15 of the rear end surface 31 with a pushing force that causes the inner wall surface of the fitting groove 14 to A pressing force is generated in which the side of the flank 35 of the tip edge 32 of the joint soil removal scraper 3 is pressed against the inner wall surface (inner wall surface of the second wall portion 12) facing the side opening 15. Note that, without being limited to the illustrated shape of the joint soil removal scraper 3 of this embodiment, it may be any shape that can exert the pressing force.
Therefore, it is difficult for dirt to enter between the flank surface 35 and the second wall portion 12, and even if it does enter, the particles are small and in a small amount, so they enter the space held by the recess 38 and solidify. is prevented from doing so.

The joint scraper 3 and the construction pile 2 may be in a connected state so that the joint scraper 3 is pulled up together with the construction pile 2 as the construction pile 2 is pulled up.
In the connected state, the movable range of the joint soil removal scraper 3 is ensured at least to the extent that the pushing force is generated by the pushing force.
A simple method for this purpose is to weld the contact portion 41 to the tip surface 23a. By limiting the welding area to a small value, the joint portion earth removal scraper 3 can be connected in a movable state to a certain extent, and the above movable range can be secured.
As described above, the construction pile 2 and the joint portion earth removal scraper 3 are connected, the workability is improved, and the joint portion earth removal scraper 3 can be pulled up as the construction pile 2 is pulled up. During the downward movement of the joint scraper 3 within the fitting groove 14, a lifting step (retreat step) of the joint scraper 3 can be performed. By including the pulling-up process (retreating process), it is possible to loosen the earth and sand in the fitting groove 14 and promote soil removal.

As described above, it is possible to implement a press-fit pile such as a steel sheet pile in which the joint part earth removal scraper 3 is connected to the tip of the fitting part 23.
In this case, the joint soil removal scraper 3 is configured to have a movable range in which it can swing toward the flank surface 35 side and the rake surface 33 side with respect to the fitting portion 23 . This is to generate the above-mentioned pressing force.

[Second embodiment]
The joint soil removal scraper 3B of the second embodiment shown in FIGS. 5 and 6 corresponds to one in which the three recesses 37, 38, and 39 of the first embodiment are connected to form one recess 37B. The rest of the structure is the same as that of the first embodiment, and the pile press-in method is carried out in the same manner.
In this way, a structure is implemented in which the recesses provided on a plurality of different side surfaces are connected and integrated.
According to the joint section earth removal scraper 3B having such a structure, the movement range of the earth and sand particles within the recess 37B becomes larger, and the effect of preventing the particles from consolidating and the effect of making them easier to release become more pronounced.
It should be noted that even if the joint soil removal scraper 3B has a retaining shape that prevents the joint soil discharge scraper 3B from leaving the side opening 15 described in the first embodiment, A portion that continues to the rear end surface 31 may be provided in the recessed portion 37B. This makes it easier to discharge the earth and sand that has entered the recess 37B upward.
Also. The recessed portion 37B may also be formed continuously from a portion facing the inner wall surface of the fitting groove 14 (inner wall surface of the fitting portion 13) to a portion facing the side opening 15. The recessed portion 37B may go around the side of the joint portion soil removal scraper 3B and be connected.

According to the embodiments described above, it is possible to effectively remove earth from the joints 10 of the existing piles 1, reduce the resistance between the joints, and improve the efficiency of the pile connection press-in construction.
Although the above embodiment has been described using a steel sheet pile as an example, the pile is not limited to a steel sheet pile, and the shape and structure of the pile main body are arbitrary. For example, U-type steel sheet piles, hat (zero)-type steel sheet piles, and Z-type steel sheet piles can be used, but are not limited to these.
In addition, in the above embodiments, steel sheet piles are connected by a joint, but this joint part is used to connect steel pipe piles, steel sheet piles and steel pipe piles, and different types of sheet piles such as U-shaped steel sheet piles and H-shaped steel sheet piles. A soil scraper may be applied. The joints can be installed on both side edges of the steel sheet pile, on the outer surface of the web portion, on the outer peripheral surface of the steel pipe, etc., and the installation position with respect to the pile body is not limited. "A joint that connects two adjacent sides of each other" means that the joint may be provided in any direction of 360 degrees around the longitudinal axis of the pile to connect them.
Further, the joints 10 and 20 in the above embodiments have a swap structure in which the fitting groove (female) and the fitting part (male) are fitted into each other, but in the implementation of the present invention, the joint has a swap structure. It is not necessary that this is the case, and a connection structure may be used in which the fitting portion of the joint on the construction pile side that does not have such a fitting groove is fitted into the fitting groove of the joint on the existing pile side.

1 Existing pile 2 Construction pile 3 Joint section earth removal scraper 3B Joint section earth removal scraper 10 Joint 11 First wall section 12 Second wall section 13 Fitting section 13a Retaining section 14 Fitting groove 15 Side opening 20 Joint 23 Fitting Joining portion 23a Tip surface 31 Rear end surface 32 Tip edge 33 Rake surface 34, 35, 36 Side surface 35 Relief surface 37, 38, 39 Recess 37B Recess 40 Rear end 41 Contact area

Claims (13)

A pile press-in method in which a pile having a joint that connects two adjacent sides is press-fitted into the ground,
The joint has a connection structure in which the fitting part of the other joint is inserted and fitted in the longitudinal direction of the fitting groove extending in the longitudinal direction of the pile and communicating with the side opening,
A pile connection press-fitting process in which the joint of the construction pile is fitted into the joint of the existing pile that has been previously pressed into the ground, and the construction pile is press-fitted,
In the pile connection press-fitting process, a joint soil removal scraper is inserted through the end surface opening on the ground side of the fitting groove of the existing pile, and the rear end surface of the joint soil removal scraper is inserted by the tip surface of the fitting portion of the construction pile. By pressing , the soil is scraped out from the fitting groove to the side opening,
A pile press-in construction method, wherein a recessed portion for maintaining a space apart from the inner wall surface is formed on the side surface of the joint portion soil removal scraper that faces the inner wall surface of the fitting groove. The rear end of the joint soil removal scraper is removed from the concave portion at a portion of the fitting portion that engages with the retaining portion adjacent to the side opening, so that the rear end portion of the joint portion soil removal scraper can be moved outward from the side opening. 2. The pile press-in construction method according to claim 1, wherein a retaining shape is ensured to prevent the joint portion of the soil removal scraper from coming off. The pile press-in construction method according to claim 1 or 2, wherein the recess is provided on a plurality of side surfaces facing an inner wall surface of the fitting groove and having different directions. 4. The pile press-in construction method according to claim 3, wherein the recessed portions are provided on all side surfaces facing the inner wall surface of the fitting groove and having different directions. The pile press-in construction method according to claim 3 or 4, wherein the recesses provided on a plurality of different side surfaces are connected to each other and are integrated. The pile press-in construction method according to any one of claims 1 to 5, wherein the recess is continuous to the rear end surface. The pile press-in construction method according to any one of claims 1 to 6, wherein the recess is formed continuously from a portion facing the inner wall surface of the fitting groove to a portion facing the side opening. In the pile connection press-fitting step, the pushing force of the tip end surface biasingly pushing a portion of the rear end surface near the side opening causes the inner wall surface of the fitting groove that faces the side opening to be The pile press-in method according to any one of claims 1 to 7, wherein a pressing force is generated to press the flank side of the tip edge of the joint portion earth removal scraper. The joint soil removal scraper and the construction pile are connected to each other so that the joint soil removal scraper is pulled up together with the construction pile as the construction pile is pulled up;
9. The pile press-in construction method according to claim 8, wherein in the connected state, a movable range of the joint soil removal scraper is ensured at least to the extent that the pushing force is generated by the pushing force. A joint scraper that has a joint that connects the sides of two adjacent piles and is inserted into the fitting groove of the joint of a pile that is press-fitted into the ground to remove soil from the fitting groove. hand,
A recess is formed on the side ,
Corresponding to the coupling structure of the joint, in which the fitting part of the mating joint is inserted and fitted in the longitudinal direction of the fitting groove extending in the longitudinal direction of the pile and communicating with the side opening,
A joint portion earth removal scraper, wherein a recessed portion for holding a space apart from the inner wall surface is formed on the side surface facing the inner wall surface of the fitting groove . A pile that is press-fitted into the ground and has a joint that connects two adjacent sides of each other,
The joint has a connection structure in which the fitting part of the other joint is inserted and fitted in the longitudinal direction of the fitting groove extending in the longitudinal direction of the pile and communicating with the side opening,
A press-fit pile in which a joint part earth removal scraper is connected to a tip of the fitting part for inserting into the fitting groove of a mating joint and removing earth from the fitting groove. 12. The press-fit pile according to claim 11 , wherein the joint soil removal scraper has a movable range that swings between a flank side and a rake surface side of the joint soil removal scraper with respect to the fitting portion. 13. The recess according to claim 11 or 12 , wherein a recessed portion for holding a space away from the inner wall surface is formed on the side surface of the joint portion soil removal scraper that faces the inner wall surface of the fitting groove. Press-in pile.

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