JP6538427B2 - Yatko with measuring rod and embedding method of pile using this - Google Patents

Description

  The present invention relates to a Yatko with a measuring rod used when burying a pile in the ground, and a method for embedding a pile using the same.

Conventionally, when a pile is buried in the ground, a pile head is held by a cap provided at the lower end of a rod of a pile driver and suspended in a suspended state while being suspended while being erected in the drilling hole and sinking by the weight of the pile. Next, while rotating the rod, sink the lower end of the pile in the rooting section filled with soil cement (in which cement milk (solidifying liquid) is muddy), and install the pile at a predetermined depth, The cap was removed from the pile head after the pile was fixed due to hardening and friction around the pile.
Moreover, the adjustment of the burial depth of the pile buried under the ground was performed by marking in advance at a predetermined position of the rod and confirming the marking on a level or the like (for example, Patent Document 1).

Japanese Utility Model Publication 63-116546

  However, in the above-mentioned conventional case, when the buried depth of the pile is confirmed and the cap is removed from the pile head, when self-sinking occurs due to hardening of the soil cement, insufficient fixing of the pile due to friction around the pile, impact of rotation, It is necessary to connect the cap and the pile again, and it is necessary to carry out work to reconfirm at the level etc., and since the sinking depth of the pile can not be confirmed directly with the measuring rod, the burial depth of the pile can be easily corrected. There was a problem that it was impossible.

  Therefore, in the above-mentioned conventional construction method, it is necessary to hold for a certain period of time until there is no possibility that the pile will settle and self-settle due to hardening of the soil cement and friction at the periphery of the pile. There was a problem that it was low.

  Furthermore, when the diameter size of the drilling hole is large, there is also a problem that the shift of the pile core tends to be large.

  The present invention makes it possible to easily measure the burial depth of the pile and solve the problem in the prior art described above, and at the same time, improves the work efficiency. The task is to create an embedding method.

Among means for solving the above problems, the first main configuration of the present invention is
Yatko connected to the head of the pile to bury the pile in the wellbore,
A cylindrical tubular body, a hollow pipe attached to the inside of the tubular body along the longitudinal direction, and a measuring rod which is inserted into the hollow pipe and is movable in the longitudinal direction of the hollow pipe so as to move back and forth. It is said that it is characterized by having.

  In the first main configuration of the present invention, since the measuring rod is disposed in the hollow pipe, the movement of the measuring rod becomes smooth, so that it is possible to easily measure the buried depth of the pile. In addition, since the hollow pipe and the measuring rod are disposed inside the cylindrical part that constitutes the Yatko, it is possible to smoothly insert the Yatko into the excavated hole, and it is also achieved to reduce the misalignment of the pile. obtain.

  According to another configuration of the present invention, the elongated first and second windows are formed in the cylindrical body in the main first means, and the measuring rod is externally supported from the window and is supported to move back and forth in the window. A unit is provided.

  In the above configuration, it is possible to achieve determination of the buried depth of the pile by measuring the height position of the supported portion that changes in accordance with the buried depth.

  Another structure of the present invention is obtained by adding a means of providing a support mechanism for supporting a supported portion in the cylindrical body portion to any of the above-described structures.

  In the above configuration, the support state in which the measuring rod is held at the upper position can be set to the non-supporting state in which the measuring rod is allowed to move downward.

A second main configuration of the present invention is a method of embedding a pile using a Yatko with a measuring rod according to any one of the above, comprising at least
A first step of injecting a rooting solution into the borehole;
A second step of constructing and inserting a pile connected to a yatco attached to a cap at the lower end of the heavy equipment side rod into a wellbore,
Set the lower end of the pile in the rooting section filled with muddling fluid while rotating it and set it down, and measure the height position of the head of the pile with a measuring rod and sink the pile to a predetermined burial depth The third step to
A fourth step of separating the connection between the cap and the Yatko after fixing the Yatko to the pedestal;
It is characterized by having the 5th process of separating a pile from Yatko after confirming that the muddy foundation fluid hardens and a pile has stopped sinking.

  In the second main configuration of the present invention, since it is not necessary to hold the pile until the pile is fixed due to hardening of the muddified rooting liquid, friction around the pile, etc., it is possible to increase the usage rate of heavy machinery. Thus, it can be achieved to improve the work efficiency of the entire embedding work.

  Moreover, the other structure of this invention adds the means of fixing with Yatko and a pedestal in a 4th process with welding to the said 2nd main means.

  In the above-mentioned configuration, it is possible to achieve quick and strong fixing of the yatco and the pedestal.

  Moreover, the other structure of this invention adds the means of using cement milk as a rooting liquid to any of the said means.

  In the above configuration, effective suppression of the self-sinking of the pile can be achieved.

Since the present invention is configured as described above, the following effects can be obtained.
In the first main configuration of the present invention, it is possible to embed the pile while confirming the embedding depth of the pile, so that the piling work can be performed efficiently. In addition, it is possible to smoothly insert the Yatsuko into the drilled hole, and since it is not necessary to make the hole diameter of the drilled hole larger than necessary, it is also possible to reduce the misalignment of the pile.

  In the second main configuration of the present invention, the heavy equipment does not have to maintain the suspended state of the pile until it no longer sinks, and it becomes possible to enter the next digging work, thereby increasing the usage rate of the heavy equipment, It will be possible to improve the efficiency of the entire piling work.

It is a perspective view showing Yatsuko as an example of the present invention. It is the longitudinal cross-sectional view shown from the side of yatsuko, and its elements on larger scale. It is an enlarged plan sectional view in the III-III line of FIG. It is sectional drawing which shows an example of the embedding method of a pile using yatsuko. It is explanatory drawing which shows the embedding method of the pile using yatsuko. It is explanatory drawing which shows the process of the embedding method of the stake following FIG. It is sectional drawing which shows the fixing method of yatsuko.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The Yatsuko 10 shown in FIGS. 1 to 3 is to be assembled and held at the head of a pile and has a cylindrical tubular body 12 and a connecting portion 13 formed in a diameter-reduced shape at its lower end. It is a metal member integrally formed.

  A plurality of engagement protrusions 14 are arranged at a constant circumferential pitch around the upper end side of the cylindrical body portion 12, and one position on the lower side of the plurality of engagement protrusions 14 is in the longitudinal direction A elongated first opening 15 is formed along the opening. At a position close to the upper end of the first window portion 15, a support mechanism 16 of a so-called lock-and-lock structure constituted by a rod-like latch 16a movable horizontally and clampers 16b and 16c holding the latch 16a is provided. It is provided.

  At the plurality of positions of the connection portion 13, engaging concave portions 17 opening in an inverted L shape are formed at a constant pitch in the circumferential direction, and it is possible to hold the head of the pile 1 as described later It is done.

  As shown in FIGS. 2 and 3, a hollow pipe 18 is fixed by means such as welding at a position facing the first window portion 15 on the inner peripheral surface 12 B of the cylindrical body 12. A measuring rod 19 made of PC steel or the like is inserted into the inside of the box. In the hollow pipe 18, a second window 18 a that opens in a slender shape along the longitudinal direction is formed at a position overlapping the first window 15 of the tubular portion 12.

  The measuring rod 19 is provided with a supported portion 19a extending in the horizontal direction, and the supported portion 19a protrudes to the outside of the tubular portion 12 through the second window 18a and the first window 15. . The supported portion 19a can be supported by the latch 16a of the support mechanism 16 provided on the surface of the cylindrical body 12 (see FIGS. 1 and 3). That is, when the latch 16a of the support mechanism 16 is pushed in the left direction (upward in FIG. 3) in FIG. 1 and the tip thereof is engaged with the clamper 16c, the supported portion 19a is set to the support state (I) by the latch 16a. it can. When the latch 16a is pulled rightward (downward in FIG. 3) in FIG. 2 to release the tip of the latch 16a from the clamper 16c, the support of the supported portion 19a by the latch 16a is released (II) It becomes. As shown by a solid line in FIG. 2, in the supported state (I), the measuring rod 19 is at a raised position, and the lower end 19 b of the measuring rod 19 is in the hollow pipe 18. Further, as shown by a broken line in FIG. 2, in the non-supporting state (II), the measuring rod 19 is at a lowered position, and the lower end 19 b of the measuring rod 19 protrudes downward from the lower end 18 b of the hollow pipe 18.

Next, how to use Yatsuko will be described.
As shown in FIG. 4, the upper end of the javelin 10 is held by a cap 22 provided at the lower end of the rod 21 which is dropped from the excavator and is used in a state of holding the pile 1 at the lower end of the jade 10. Ru.

  More specifically, on the side surface of the cap 22, a plurality of engagement recesses 23 having the same configuration as the engagement recesses 17 provided in the connection portion 13 of the above-described jaw 10 are formed. Further, on the side surface on the head 2 side of the stake 1, a plurality of engagement convex portions 4 having the same configuration as the engagement convex portions 14 provided on the upper part of the jaw 10 are formed. Then, the cap 22 is rotated in a state in which the cap 22 is placed on the upper part of the yakko 10, and the multiple engaging concave parts 23 of the cap 22 are engaged with the multiple engaging convex parts 14 provided on the upper part of the yakko 10, respectively. Holds the upper end of the yakko 7. Similarly, a plurality of engagement recesses 17 of the connection portion 13 are provided on the side surface of the pile 1 on the side of the head 2 by rotating the connection portion 13 of the jack 10 over the head 2 of the pile 1. The head portion 2 of the pile 1 is held at the lower end of the jaw 10 by engaging the engagement convex portions 4 respectively. At this time, the measuring rod 19 is set to the support state (I).

Next, a method of embedding a pile using a yatco will be described.
FIG.5 and FIG.6 is explanatory drawing which shows the embedding method of the pile using Yatsuko in order of a process.
In the process shown in FIG. 5A, a heavy machine 30 composed of a pile driver and an excavator is moved to a position where the pile 1 is embedded, and is installed (set) on the work ground using the auger head 31. In the process shown in FIG. 5B, the ground 41 is excavated toward the support layer 42 while injecting a cutting fluid (usually using water) from the tip of the auger head 31, and the stirred mud is the wall surface of the drilling hole 43. Mix in In the process shown in FIG. 5C, excavation is performed to a position of a predetermined buried depth D + a predetermined pile lower moat length (for example, 1 m) according to the method.

  In the process shown in FIG. 6D, the auger head 31 is reversely rotated to open the expansion wing, and while the auger head 31 is reversely rotated, cement milk (for example, based on a water-cement ratio W / C = 60%) is formed. After the rooting fluid is injected and the bottom portion 44 of the drilling hole 43 is enlarged to form the rooting portion 45 (first step), the auger head 31 is rotated forward to close the expanding wing, and the circumferential fixing liquid (for example, , Pull up the auger head 31 while injecting a water-cement ratio W / C = 100%). In addition, the rooting liquid (cement milk) is changed into a muddy state (hereinafter, referred to as "the muddy rooting liquid (soil cement)") through these steps.

  In the process shown in FIG. 6E, the pile 1 is suspended and erected and inserted into the drilling hole 43 (second process). At this time, as described in the above-mentioned method of use, the upper end of the yoke 10 is engaged and held by the cap 22 at the lower end of the rod 21 on the heavy machine 30 side, and the head of the pile 1 is held by the connection portion 13 at the lower end of the yoke 10. Hold the part 2 in engagement.

In the process shown in FIG. 6F, the lower end 5 of the pile 1 is sunk while giving rotation to the rooting part 45 filled with muddified rooting fluid (soil cement) 51a, and the height position of the pile 1 is measured and While adjusting, insert to a predetermined buried depth D (third step).
Here, the measurement of the predetermined buried depth D is performed using the measuring rod 19. That is, as shown in FIG. 4, the measuring rod 19 is brought into the non-supporting state (II), the measuring rod 19 is lowered, and its lower end 19b is abutted on the head 2 of the pile 1. Then, the measurement height position (height position from the reference point 40 to the supported portion 19a) H of the measuring rod 19 which descends in response to the sinking of the head 2 of the pile 1 reaches a predetermined height position Measure the level by level. Assuming that the effective length of the measuring rod 19 (length from the supported portion 19a and the lower end 19b) is L, a predetermined embedding depth (length from the reference point 40 to the head 2 of the pile 1) D is D = It can be calculated from L-H. Therefore, the pile 1 can be sunk to a predetermined buried depth D by checking the measurement height position H of the measuring rod 19.

  Then, as shown in FIG. 7, the pedestal 52 was previously disposed on the ground 40 in the vicinity of the opening end of the drilling hole 43, and it was confirmed that the head 2 of the pile 1 reached a predetermined burial depth D If so, the cylindrical body portion 12 of the Yatsuko 10 is fixed to the pedestal 52 by means of, for example, welding 53 (fourth step).

  Finally, as shown in FIG. 6G, the embedding of the pile 1 is completed by rotating the rod 21 in the reverse direction and removing the cap 22 from the upper end of the jaw 10 (fifth step).

  As described above, when the cylindrical body 12 of the Yatsuko 10 is fixed to the receiving table 52, before the pile is fixed by hardening of the mud cemented rooting liquid (Soil cement) 51a, friction at the periphery of the pile, etc. Even if there is a possibility that the pile 1 may sink, it is possible to separate the cap 22 from the upper end of the yakko 10. As a result, the heavy machine 30 does not have to maintain the suspended state of the pile 1 until it does not sink, and it becomes possible to enter the next digging operation, so the usage rate of the heavy machine 30 increases and It is possible to improve the efficiency.

  In addition, it was confirmed that the pile was fixed due to the hardening of the muddified rooting liquid (Soil cement) 51a, friction at the periphery of the pile, etc., and that the pile 1 did not sink because the fixation between the Yatsuko 10 and the pedestal 52 was released. It can be done after

  By the way, unlike the above-mentioned present invention, in the case where the measuring rod 19 is provided outside the yatko, it is necessary to project a guide member or the like for holding the measuring rod 19 to the outside of the yatko. When the Yatsuko is inserted into the drilled hole 43, there is a possibility that the guide member or the like may be caught on the wall surface of the hole and can not be inserted smoothly. Moreover, in order to prevent such a possibility, it is conceivable to increase the hole diameter of the drilling hole 43, but in this case a large amount of the circumferential fixing liquid of the pile is required or the misalignment of the pile 1 becomes large. The inconvenience of this arises.

However, in the case where the measuring rod 19 is provided inside the Yatko 10 as in the present invention, the Yatko 10 can be smoothly inserted into the drilling hole 43, and the hole diameter of the drilling hole 43 is required. Since it is not necessary to make it larger than the above, it is possible to reduce the misalignment of the pile 1 as well.
Further, at the time of measurement, the measuring rod 19 is configured to descend in the hollow pipe 18, and there is no need to insert the measuring rod 19 into the ground and strike it against the head 2 of the pile 1 while digging with the tip. The measurement can be performed more quickly and accurately, and the deformation of the measuring rod 19 can be prevented.

As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.
For example, in the above embodiment, the support mechanism 16 having the interlocking lock structure has been shown and described on the outer surface of the cylindrical body portion 12 which constitutes the Yatsuko 10, but the embodiment of the present invention is limited to the above embodiment. Instead, for example, a substantially L-shaped notch is continuously provided at the upper end of the first window 15 in the cylindrical body 12, and the supported portion 19a is held by the notch to obtain a support state (I). It may be

1: Pile 2: Head 4: Engaging convex part 10: Jade 12: Tube body part 13: Connection part 14: Engaging convex part 15: First window part (window part)
16: support mechanism 16a: latch 16b: clamper 16c: clamper 17: engagement recess 18: hollow pipe 18a: second window (window)
19: Measuring rod 19a: Supported portion 19b: Bottom end of measuring rod 21: Rod 22: Cap 23: engagement recess 30: heavy machine 31: auger head 40: reference point 41: underground 42: support layer 43: digging Hole 44: Bottom of borehole 45: Rooting part 51: Rooting fluid 51a: Mud-bearing rooting fluid (soil cement)
52: Receiving table D: Buried depth H: Measuring height position of measuring bar L: Effective length of measuring bar

Claims (6)

Yatko connected to the head (2) of the pile (1) for burying the pile (1) in the drilling hole (43),
Cylindrical tubular body portion (12), the cylindrical body portion (12) a hollow pipe mounted along the longitudinal direction on the inner side of (18), is inserted into the hollow pipe (18), the hollow And a measuring rod (19) movable in the longitudinal direction of the pipe (18) so as to be movable back and forth.   A long and thin window (15) is formed in the cylindrical body (12), and the measuring rod (19) protrudes from the window (15) to the outside and is movable back and forth in the window (15) The Yatko with a measuring rod according to claim 1, further comprising a supported portion (19a).   3. The Yatko with a measuring rod according to claim 2, wherein a support mechanism (16) for supporting the supported portion (19a) is provided in the cylindrical body portion (12). A method of embedding a pile using a Yatko with a measuring rod according to any one of claims 1 to 3, at least
A first step of injecting a rooting solution (51) into the wellbore (43);
A second step of erecting and inserting a pile (1) connected to a jack (10) attached to a cap (22) at a lower end of a rod (21) on a heavy machine (30) side into the excavated hole (43);
The lower end (5) of the pile (1) is self-sinked while giving rotation to the rooting part (45) filled with the muddling liquid (51a), and the pile (1) is taken with the measuring rod (19) A third step of setting the pile (1) to a predetermined buried depth (D) while measuring the height position of the head (2) of
A fourth step of separating the connection between the cap (22) and the yatko (10) after fixing the yatko (10) to the pedestal (52);
A fifth step of separating the pile (1) from the yatko (10) after confirming that the muddy rooting fluid (51a) hardens and the pile (1) does not sink.
And a method of embedding a pile using a Yatko with a measuring rod.   5. The method of embedding a pile using a Yatko with a measuring rod according to claim 4, wherein the fixing of the Yatko (10) to the pedestal (52) in the fourth step is performed by welding.   The method of embedding a pile using a Yatoko with a measuring rod according to claim 4 or 5, wherein cement milk is used as the rooting liquid (51).

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