JP2013234450A - Pile follower and construction method of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile follower capable of easily and accurately measuring a pile head depth being embedded, and easily correcting the pile head depth even when a pile has submerged by itself after being embedded, and a construction method of a pile.SOLUTION: A pile follower 10 includes a rod 12 and a rotary cap 18 which is connected to a lower end of the rod 12 and is engageable with an upper end 16 of a pile 14, and is used for embedding the pile 14 in a pile hole 22. A measurement rod 20 for measuring an embedding depth underground of the upper end 16 of the pile 14 is disposed relatively movably to the rod 12 along an extending direction of the rod 12, and a lower end 20a of the measurement rod 20 is made fixable to the upper end 16 of the pile 14.

Description

  The present invention relates to a yatco used when burying a ready-made pile, for example, in a pre-boring expanded solidification method and the like, and in particular, a yatco provided with means for accurately grasping a pile head height and It relates to the construction method of piles.

  Conventionally, in order to support a building when a building is built, a ready-made pile such as a concrete pile is buried in the ground. Normally, in the case of a building having an underground structure such as an underground floor or underground beam, the upper end portion (pile head) of the pile is buried corresponding to the foundation under the underground structure. One of the ready-made pile burial methods is the pre-boring expansion caulking method. In such a method, a rod and a yatco are used to transmit rotational torque between the upper end of the pile and the ground drive unit. The pile is buried.

  The following methods are known as general embedment depth management methods when burying piles. In other words, the embedment standard is marked in advance in the rod body, and the rod is rotationally pressed into the ground while measuring on the ground level. The pile engaged with the rotating cap at the lower end of the rod is rotationally pressed into the ground together with the rod. Then, after confirming that the pile has reached a predetermined depth according to the above embedment guideline, it is determined to some extent by the operator's sense whether there is any load on the pile weight (whether the pile has not settled). If it is determined that there is no load on the pile weight, the rod is reversely rotated to remove the rotating cap from the upper end of the pile, and the rod is pulled up to the ground.

  After that, a measuring rod (for example, a steel rod such as a piano wire) is inserted into the pile hole from the ground, and the head of the pile is found as an operator, and the pile depth and self-settlement status are determined by the insertion length (height) of the measuring rod. The burial depth is managed by the procedure of confirming.

  On the other hand, as a technique for accurately measuring the depth of a working rod for ground improvement, a construction management system of Patent Document 1 is known.

Japanese Patent Application Laid-Open No. 2004-250956

  By the way, when the pile head depth is considerably deep such as 10 m or more from the construction ground surface, even if the measuring rod is inserted into the pile hole from the ground, the approach is often prevented by contacting the hole wall. It is extremely difficult to find a pile dough-shaped pile head in a considerably deep position in a short time.

  Even if the pile head is finally found, it is very difficult to correct the pile head depth by inserting the Yatco into the pile hole again when it is confirmed that the pile is self-sunk.

  For this reason, the development of a technique that can easily and accurately measure the pile head depth during burial and can easily correct the pile head depth even when the pile self-sinks after burial is desired. It was.

  The present invention has been made in view of the above, and can easily and accurately measure the pile head depth during burial, and easily correct the pile head depth even when the pile is self-sunk after burial. It aims at providing the construction method of the Yatco and the pile which can do.

  In order to solve the above-described problems and achieve the object, a yatco according to claim 1 of the present invention includes a rod and a rotating cap connected to the lower end portion of the rod and engageable with the upper end portion of the pile. A pile used for burying the pile in the pile hole, and a measuring rod for measuring the depth of burying the upper end of the pile in the ground along the extending direction of the rod The rod is disposed so as to be movable relative to the rod, and the lower end portion of the measuring rod can be fixed to the upper end portion of the pile.

  Further, in the second aspect of the present invention, in the first aspect described above, the measuring rod is disposed outside the rod and can be fixed to the upper end portion of the pile through the rotating cap. It is characterized by that.

  Moreover, the construction method of the pile which concerns on Claim 3 of this invention is a method of embedding a pile using the Yatco of Claim 1 or 2 mentioned above, Comprising: The lower end part of the said measuring rod is said pile. The rod is rotated and press-fitted while confirming the burial depth of the pile by measuring the height of the measuring rod after the rotation cap is engaged with the upper end of the pile. The pile is buried.

  Moreover, the construction method of the pile which concerns on Claim 4 of this invention is the above-mentioned Claim 3. WHEREIN: After constructing the said pile to the predetermined embedment depth, measuring the height of the said measuring rod, the said pile Grasping the self-settlement tendency, and as a result, when the self-settlement tendency is recognized, the burial depth of the pile is corrected by pulling up the rod, and after confirming that the pile does not self-sink, from the upper end of the pile The rotating cap is detached and the rod is pulled up.

  According to the yatco according to the present invention, a rod and a rotary cap connected to the lower end of the rod and engageable with the upper end of the pile are used for embedding the pile in the pile hole. A measuring rod for measuring the depth of burying the upper end of the pile in the ground so as to be movable relative to the rod along the extending direction of the rod. The lower end portion of the scale bar can be fixed to the upper end portion of the pile. For this reason, the lower end of the measuring rod is fixed to the upper end of the pile and the rotation cap is fitted to the upper end of the pile so that the rod protrudes to the ground when the rod is rotationally press-fitted and the pile is embedded. By measuring the height of the measuring rod, the burial depth of the pile can be confirmed easily and accurately. Even if the rotary cap is removed from the upper end of the pile and the rod is pulled up after the pile is laid, the measuring rod remains fixed to the upper end of the pile, so the burial depth after burying the pile remains on the ground. Can be measured easily and accurately. In addition, the self-sinking tendency of the pile can be grasped by measuring the height of the measuring rod after the pile is laid, and if the self-sinking tendency is recognized as a result, the burying depth of the pile can be corrected by pulling up the rod. Is possible. Therefore, it is possible to easily and accurately measure the pile head depth during burial, and it is possible to easily correct the pile head depth even when the pile self-sinks after burial.

  Moreover, according to the construction method of the pile which concerns on this invention, it is the method of carrying out the construction construction of the pile using the yatco of Claim 1 or 2 mentioned above, Comprising: The lower end part of the said measuring rod is made into the upper end of the said pile. After fixing the rotary cap to the upper end of the pile, the rod is rotated and press-fitted while checking the depth of the pile by measuring the height of the measuring rod. Since the pile is buried, the pile head depth during burial can be measured easily and accurately, and the pile head depth can be easily corrected even when the pile is self-sinking after burial.

FIG. 1 is a side view showing an embodiment of a yatco according to the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4: is a figure which shows the process 1 of Example 1 of the construction method of the pile concerning this invention, (1) is a sectional side view, (2) is the C partial enlarged view of (1). FIG. 5: is a figure which shows the process 2 of Example 1 of the construction method of the pile which concerns on this invention, (1) is a sectional side view, (2) is the C partial enlarged view of (1). FIG. 6: is a figure which shows the process 1 of Example 2 of the construction method of the pile which concerns on this invention, (1) is a sectional side view, (2) is the C partial enlarged view of (1). FIG. 7: is a figure which shows the process 2 of Example 2 of the construction method of the pile which concerns on this invention, (1) is a sectional side view, (2) is the C partial enlarged view of (1).

  Below, the embodiment of the construction method of the Yatco and the pile concerning the present invention is described in detail based on a drawing. Note that the present invention is not limited to the embodiments.

[Yatco]
First, an embodiment of a yatco according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1 and FIG. 2, the Yatco 10 according to the present invention is used to embed a pile 14 in a pile hole 22, and is connected to a rod 12 and a lower end portion of the rod 12. A rotation cap 18 that can be fitted and engaged with an upper end 16 of a ready-made pile 14 such as a pile, and a measuring rod 20 are provided.

  The measuring rod 20 is for measuring the depth of the upper end portion 16 of the pile 14 embedded in the ground, and from a steel rod such as a piano wire disposed outside the rod 12 along the extending direction thereof. Become. As shown in FIGS. 1 and 3, the measuring rod 20 is inserted into a guide hole 26 of a guide member 24 projecting at a predetermined interval in the extending direction of the rod 12, and moves relative to the rod 12. It is possible. As shown in FIGS. 1 and 2, the lower end portion 20 a of the measuring rod 20 passes through the rotation cap 18 and is fixed to the upper end portion 16 of the pile 14.

  As shown in FIG. 1, the measuring rod 20 is configured such that an additional measuring rod 20 can be added via a joint member 28, thereby extending the length of the measuring rod 20. It has become. The joint member 28 has an outer diameter that can pass through each guide hole 26 (see FIG. 3).

  As shown in FIGS. 1 and 2, the rotating cap 18 is a substantially cylindrical cap, and a rib 30 having a cross shape in plan view is provided on the upper surface thereof. The lower end of the rod 12 is connected to the center of the rib 30. As shown in FIG. 1, a transmission portion 32 cut out in a key shape is provided on the lower side of the body portion of the rotary cap 18.

  The upper end portion 16 of the pile 14 has a substantially cylindrical shape, and an engaging portion 34 for engaging with the transmitting portion 32 of the rotating cap 18 protrudes from the outer peripheral surface thereof. The lower end portion 20a of the measuring rod 20 passes through the insertion hole 36 provided in the rib 30 of the rotation cap 18 and extends downward, and is fixed to a connecting member 38 extending horizontally to the upper end portion 16 of the pile 14 with a bolt or the like. ing.

  Marking H <b> 1 and H <b> 2 indicating the embedment standard of the pile 14 are provided on the outer circumferences of the upper portion of the rod 12 and the upper portion of the measuring rod 20, respectively. Here, the rod side marking H1 and the measuring rod side marking H2 are positioned at the same height in a state immediately before the rotary cap 18 is externally engaged with the upper end portion 16 of the pile 14 and the pile 14 is rotationally press-fitted. Have been adjusted so that.

The operation and action of the above configuration will be described.
The rotary cap 18 is externally fitted to the upper end portion 16 of the pile 14 so that the transmission portion 32 of the rotary cap 18 is engaged with the engaging portion 34. In this state, a driving device (not shown) is driven to drive the rod 12 and The rotary cap 18 is rotated in the forward direction (for example, clockwise), and the rotational torque of the driving device is transmitted to the upper end portion 16 of the pile 14 to rotationally press the pile 14.

  Here, when the rod 12 is rotationally press-fitted and the pile 14 is buried, the depth of the pile 14 can be confirmed easily and accurately by measuring the height of the measuring rod 20 protruding above the ground. it can. Here, the height of the measuring rod 20 can be measured by measuring the measuring rod side marking H2 with a level or the like.

  When the pile 14 reaches a predetermined embedment depth set in advance, the driving device (not shown) is rotated in the reverse direction (for example, counterclockwise) to disengage the rotary cap 18 from the upper end 16 of the pile 14. The rod 12 is pulled up.

  In addition, it is necessary to lengthen the length of the rod 12 according to the embedding depth of the pile 14. For this reason, the length according to the required embedding depth is ensured by adding a plurality of rods 12 having a preset length from above.

  Here, even if the rotary cap 18 is detached from the upper end portion 16 of the pile 14 and the rod 12 is pulled up after the pile 14 is buried, the measuring rod 20 remains fixed to the upper end portion 16 of the pile 14. The embedding depth after embedding 14 can be measured easily and accurately on the ground.

  Moreover, the self-sinking tendency of the pile 14 is grasped by measuring the height of the measuring rod 20 after the pile is buried. As a result, when the self-sinking tendency is recognized, the burying depth of the pile 14 is increased by lifting the rod 12. It is also possible to modify.

  Therefore, according to the YATCO 10 of the present invention, it is possible to easily and accurately grasp the pile head depth and the self-sinking tendency after burying. Moreover, since the embedding depth can be measured in a state where the pile 14 is held by the Yatco 10, the embedding depth of the pile 14 can be easily corrected by pulling up the rod 12 even when the pile 14 self-sinks after embedding, The pile 14 can be constructed with high accuracy.

[Pile construction method]
Next, an embodiment of the pile construction method according to the present invention (Examples 1 and 2) will be described by taking an example of pile burying construction in the pre-boring expansion root solidification method.

Example 1
First, Example 1 of the pile construction method according to the present invention will be described with reference to FIGS. 4 and 5. This Example 1 is an example in the case where the pile after rotary press-fitting is stationary at a specified embedding depth.

  The pile construction method according to the first embodiment is a method of burying a pile using the above-described Yatco 10 of the present invention, and is constructed according to the following procedure. First, a pile hole is excavated in advance and a curable filler is filled in the hole, and a pile is inserted and built in the hole. Here, excavation of a pile hole with an auger or the like before the pile is built, filling with a curable filler such as cement milk, formation of a root-solidified portion with a root-solidifying liquid, and the like are the same as in the conventional construction method.

  Next, the rotary cap 18 of the Yatco 10 of the present invention is engaged with the upper end portion 16 of the pile 14, the rod 12 is rotated forward by the driving device, and the pile 14 is rotationally press-fitted to a specified depth in the pile hole 22. (See FIG. 1). In this case, if the rotary press-fit is performed while checking the burial depth of the pile 14 by measuring the height of the marking rod side marking H2 (the height of the guillotine bar), the pile head depth during burial can be easily and accurately determined. It can be measured.

  FIG. 4 shows a state of the process 1 in which the pile 14 after the rotary press-fitting is stationary at a predetermined embedment depth H. As shown in FIG. 4, the positions of the markings H1 and H2 measured by the level 40 installed on the ground surface GL are the same during the embedding and immediately after reaching the specified embedding depth H (for example, about H = 10 m). It becomes height.

  Subsequently, the rod 12 is slightly lifted (for example, about 5 cm) by a driving device (not shown).

  FIG. 5 shows a state of step 2 in which the rod 12 is slightly lifted. As shown in FIG. 5, the transmission portion 32 of the rotating cap 18 and the engaging portion 34 of the upper end portion 16 of the pile 14 are separated from each other, and the pile 14 is temporarily in a free state that is not supported by the Yatco 10. If the position of the rod side marking H1 rises and the position of the measuring rod side marking H2 does not move, the self-sinking of the pile 14 has not occurred. Therefore, after confirming that the position of the marking H2 is not lowered in a state where the rod 12 is slightly lifted, the rod 12 is reversely rotated to engage the engaging portion 34 of the transmission portion 32 of the rotating cap 18 and the upper end portion 16 of the pile 14. The rod 12 is lifted to the ground.

  Even if the rod 12 is pulled up, the measuring rod 20 remains fixed to the upper end portion 16 of the pile 14, so that the burial depth after burying the pile 14 (for example, the next day) can be easily and accurately on the ground. It can also be measured.

  Thus, according to the present Example 1, since the pile head depth after embedding can be measured easily and accurately, it is possible to improve the workability of pile embedding and improve the accuracy of the finished shape. it can.

(Example 2)
Next, Example 2 of the pile construction method according to the present invention will be described with reference to FIGS. This Example 2 is a coping example when the pile after rotary press-fitting is self-sinking and deviates from the specified embedment depth.

  The pile construction method according to the second embodiment is a method of embedding the pile 14 using the above-described Yatco 10 of the present invention. After the pile 14 is constructed to a predetermined embedding depth, the height of the measuring rod 20 is increased. By measuring the height, the self-sinking tendency of the pile 14 is grasped. As a result, when the self-sinking tendency is recognized, the burying depth of the pile 14 is corrected by pulling up the rod 12, and it is confirmed that the pile 14 does not self-sink. After that, the rotary cap 18 is detached from the upper end portion 16 of the pile 14 and the rod 12 is pulled up.

  More specifically, the second embodiment is the same as the first embodiment until the procedure in which the pile 14 is rotationally press-fitted into a prescribed depth (for example, depth H = about 10 m) in the pile hole 22.

  FIG. 6 shows a state of the process 1 in which the pile 14 is self-sinked and deviates from a predetermined embedding depth. As shown in FIG. 6, when the pile 14 self-sinks after reaching the prescribed embedding depth, the position of the measuring rod side marking H2 measured by the level 40 installed on the ground surface GL is the position of the rod side marking H1. Since it falls below the position, a tendency to self-sink will be recognized.

  Therefore, in this case, the rod 12 is pulled up by a driving device (not shown) to pull up the self-sunk pile 14 to a specified embedding depth, and the rod 12 is held for a certain period of time by the pedestal 42 on the ground surface GL. By holding for a certain period of time, the curable filler in the pile hole 22 is cured and the self-sinking tendency of the pile 14 is suppressed.

  FIG. 7 shows the state of step 2 after the rod 12 is held by the cradle 42 for a certain period of time. As shown in FIG. 7, after holding the rod 12 for a certain period of time, the rod 12 is lowered and it is confirmed that the position of the measuring rod side marking H <b> 2 is not lowered, and then the rod 12 is rotated in the reverse direction to rotate the rotating cap 18. The engagement between the transmitting portion 32 and the engaging portion 34 of the upper end portion 16 of the pile 14 is released, and the rod 12 is pulled up to the ground.

  Thus, according to the present Example 2, the self-sinking tendency of the pile 14 is grasped by measuring the height of the measuring rod side marking H2 (height of the measuring rod) after the pile is buried, and as a result, the self-sinking When a tendency is recognized, it is possible to correct the embedding depth of the pile 14 by pulling up the rod 12. For this reason, it is possible to improve the workability of pile burial and improve the accuracy of the finished shape.

  As described above, according to the Yatco according to the present invention, the rod and the rotating cap connected to the lower end portion of the rod and engageable with the upper end portion of the pile are provided, and the pile is embedded in the pile hole. A measuring rod for measuring the burial depth of the upper end of the pile in the ground so as to be movable relative to the rod along the extending direction of the rod. In addition, the lower end of the measuring rod can be fixed to the upper end of the pile. For this reason, the lower end of the measuring rod is fixed to the upper end of the pile and the rotation cap is fitted to the upper end of the pile so that the rod protrudes to the ground when the rod is rotationally press-fitted and the pile is embedded. By measuring the height of the measuring rod, the burial depth of the pile can be confirmed easily and accurately. Even if the rotary cap is removed from the upper end of the pile and the rod is pulled up after the pile is laid, the measuring rod remains fixed to the upper end of the pile, so the burial depth after burying the pile remains on the ground. Can be measured easily and accurately. In addition, the self-sinking tendency of the pile can be grasped by measuring the height of the measuring rod after the pile is laid, and if the self-sinking tendency is recognized as a result, the burying depth of the pile can be corrected by pulling up the rod. Is possible. Therefore, the pile head depth during embedding can be measured easily and accurately, and the pile head depth can be easily corrected even when the pile is self-sinking after embedding.

  Moreover, according to the construction method of the pile which concerns on this invention, it is the method of carrying out the construction construction of the pile using the yatco of Claim 1 or 2 mentioned above, Comprising: The lower end part of the said measuring rod is made into the upper end of the said pile. After fixing the rotary cap to the upper end of the pile, the rod is rotated and press-fitted while checking the depth of the pile by measuring the height of the measuring rod. Since piles are buried, the pile head depth during burial can be measured easily and accurately, and the pile head depth can be easily corrected even if the piles are self-sinking after burial.

  As described above, the construction method of the yatco and the pile according to the present invention is useful for the construction method of the yatco and the pile used when burying the ready-made pile in the pre-boring expansion root solidification method or the like. Is suitable for accurately grasping the pile head height, such as when the depth is 10 m or more from the construction ground.

DESCRIPTION OF SYMBOLS 10 Yatco 12 Rod 14 Pile 16 Upper end part 18 Rotation cap 20 Measuring rod 20a Lower end part 22 Pile hole 24 Guide member 26 Guide hole 28 Joint member 30 Rib 32 Transmission part 34 Engagement part 36 Insertion hole 38 Connection member 40 Level 42 cutting Cradle H1 Rod side marking H2 Measuring rod side marking H Depth GL Ground surface

Claims (4)

A rod and a rotating cap connected to the lower end of the rod and engageable with the upper end of the pile, and a yatco used to bury the pile in the pile hole,
A measuring rod for measuring the depth of embedding of the upper end of the pile into the ground is disposed so as to be movable relative to the rod along the extending direction of the rod. Yatco characterized in that the lower end can be fixed to the upper end of the pile.   The said measuring rod is arrange | positioned on the outer side of the said rod, penetrated the said rotation cap, and was able to be fixed to the upper end part of the said pile, The yatco of Claim 1 characterized by the above-mentioned. A method for embedding a pile using the yatco according to claim 1,
After fixing the lower end of the measuring rod to the upper end of the pile and engaging the rotating cap with the upper end of the pile, the depth of the pile embedded by measuring the height of the measuring rod The pile construction method is characterized in that the pile is buried by rotationally press-fitting the rod while confirming.   After constructing the pile to a predetermined embedding depth, measure the height of the measuring rod to grasp the self-settlement tendency of the pile, and as a result, if the self-settlement tendency is recognized, pull up the rod. 4. The pile according to claim 3, wherein after the embedding depth of the pile is corrected and the pile is confirmed not to self-sink, the rod is lifted by removing the rotating cap from the upper end of the pile. Construction method.

Images