JP2016223071A - Plier with measurement rod, and pile burial method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plier with a measurement rod of improved work efficiency that enables a pile burial depth to be measured readily, along with a pile burial method using the same.SOLUTION: A plier is connected to a head part 2 of a pile 1 for burying the pile 1 in a drilled hole 43, and includes a cylindrical shaft part 12, a hollow pipe 18 fitted inside the shaft part 12 in a longitudinal direction, and a measurement rod 19 inserted into the hollow pipe 18, to be movable in forward/backward directions.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a yatco with a measuring rod used when a pile is buried in the ground and a pile embedding method using the same.

Conventionally, when the pile is buried in the ground, the pile head is held in a suspended state by holding the head of the pile with a cap provided at the lower end of the rod of the pile driving machine, and is sunk by the weight of the pile. Next, while rotating the rod, the lower end of the pile is sunk in a root-filled part filled with soil cement (cemented milk (root-setting liquid) is mud), and the pile is installed at a predetermined depth. The cap was removed from the pile head after the pile settled due to hardening of the pile and friction around the pile.
Moreover, adjustment of the embedment depth of the pile embed | buried under the ground was implemented by giving marking beforehand to the predetermined position of a rod, and confirming this marking by a level etc. (for example, patent document 1).

Japanese Utility Model Publication No. 63-116546

  However, in the above conventional method, when the pile depth is confirmed and the cap is removed from the pile head, if the pile is self-sunk due to insufficient fixation of the pile due to the hardening of the soil cement or the friction around the pile, the impact of rotation, etc. It is necessary to reconfirm the level by connecting the cap and the pile again, and it is not possible to directly check the pile setting depth with a measuring rod. There was a problem that I could not.

  Therefore, in the above conventional method, it is necessary to hold the pile for a certain period of time until there is no possibility of the pile fixing and self-sinking due to the hardening of the soil cement and friction around the pile. There was a problem of being low.

  Furthermore, when the diameter size of the excavation hole is large, there has been a problem that the pile misalignment tends to increase.

  In order to solve the above-described problems in the prior art, the present invention makes it possible to easily measure the burial depth of a pile and improve the working efficiency of a yatco with a measuring rod and a pile using the same. The problem is to create an embedding method.

Among the means for solving the above problems, the first main configuration of the present invention is as follows.
It is a Yatco that is connected to the head of the pile to bury the pile in the excavation hole,
It has a cylindrical tubular part, a hollow pipe attached along the longitudinal direction inside the tubular part, and a measuring rod that is inserted into the hollow pipe and moves freely. It is said.

  In the 1st main structure of this invention, since the movement of a measuring rod becomes smooth from having arrange | positioned the measuring rod in a hollow pipe, it can achieve measuring the embedding depth of a pile easily. In addition, since the hollow pipe and the measuring rod are arranged inside the cylindrical part constituting the yatco, the yatco can be smoothly inserted into the excavation hole, and the misalignment of the pile is reduced. obtain.

  In another configuration of the present invention, the main first means is supported by forming an elongated window portion in the cylindrical body portion, projecting from the window portion to the outside of the measuring rod, and moving in the window portion so as to freely advance and retract. It is a thing which added the means that the part was provided.

  In the said structure, it can achieve calculating | requiring the embedding depth of a pile by measuring the height position of the supported part which changes according to an embedding depth.

  The other structure of this invention adds the means of providing the support mechanism which supports a to-be-supported part to a cylindrical part in any one of the said structures.

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

Moreover, the second main configuration of the present invention is a pile embedding method using the yatco with the measuring rod according to any of the above, and at least,
A first step of injecting a root hardening liquid into the borehole;
A second step in which a pile connected to a Yatco attached to the cap at the lower end of the heavy machinery side rod is built and inserted into the excavation hole;
The pile is placed in a rooted part filled with a muddy rooting solution filled with mud. The pile is placed at a predetermined depth while measuring the height of the head of the pile with a measuring rod. A third step to perform,
A fourth step of disconnecting the connection between the cap and the YATCO after fixing the YATCO to the cradle;
And a fifth step of separating the pile from the yatco after confirming that the muddy root-setting liquid has hardened and the pile is no longer submerged.

  In the second main configuration of the present invention, it is not necessary to hold the pile until the pile is fixed due to hardening of the muddy root hardening liquid, friction around the pile, etc., so it becomes possible to increase the usage rate of heavy machinery. As a result, it is possible to improve the working efficiency of the entire embedding operation.

  In another configuration of the present invention, the second main means is added with means for fixing the Yatco and the cradle in the fourth step by welding.

  In the above configuration, it is possible to quickly and firmly fix the Yatco and the cradle.

  In another configuration of the present invention, a means that cement milk is used as a root hardening liquid is added to any of the above means.

  In the above configuration, it is possible to effectively suppress the self-sinking of the pile.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the 1st main structure of this invention, since it becomes possible to embed a pile, confirming the embedding depth of a pile, the burial | builing operation | work of a pile can be performed efficiently. Further, it is possible to smoothly insert the Yatco into the excavation hole, and further, the center deviation of the pile can be reduced because it is not necessary to increase the diameter of the excavation hole more than necessary.

  In the second main configuration of the present invention, the heavy machinery does not need to maintain the suspended state of the pile until it no longer sinks, and it becomes possible to enter the next excavation work. The efficiency of the entire pile embedding work can be improved.

It is a perspective view which shows the Yatco as an Example of this invention. It is the longitudinal cross-sectional view shown from the side of a Yatco, and its partial enlarged view. FIG. 3 is an enlarged plan sectional view taken along line III-III in FIG. 2. It is sectional drawing which shows an example of the embedding method of the pile using a Yatco. It is explanatory drawing which shows the embedding method of the pile using a Yatco. It is explanatory drawing which shows the process of the embedding method of the pile following FIG. It is sectional drawing which shows the fixing method of a Yatco.

Embodiments of the present invention will be described below with reference to the drawings.
The Yatco 10 shown in FIGS. 1 to 3 is assembled and held on the head of the pile, and has a cylindrical tubular body portion 12 and a connecting portion 13 formed in an enlarged diameter at the lower end thereof. The metal member is integrally formed.

  A plurality of engaging convex portions 14 are arranged at a constant circumferential pitch around the upper end side of the cylindrical body portion 12, and at a position on the lower side of the plurality of engaging convex portions 14 in the longitudinal direction. A first window portion 15 is formed so as to open in an elongated shape along the first window portion 15. Further, at a position near the upper end of the first window portion 15, there is a support mechanism 16 having a so-called pinch lock structure constituted by a rod-like latch 16a that can move in the horizontal direction and clampers 16b and 16c that hold the latch 16a. Is provided.

  At a plurality of positions of the connecting portion 13, engagement concave portions 17 that open in an inverted L shape are formed at a constant pitch in the circumferential direction, and the head of the pile 1 can be held as will be described later. Has been.

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

  The measuring rod 19 is provided with a supported portion 19a extending in the horizontal direction, and this supported portion 19a protrudes outside the cylindrical portion 12 through the second window portion 18a and the first window portion 15. . The supported portion 19a can be supported by a latch 16a of a 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 leftward in FIG. 1 (upward in FIG. 3) and its tip 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 in FIG. 2 (downward in FIG. 3) and the tip of the latch 16a is detached 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, the support state (I) is in a position where the measuring rod 19 is raised, 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, the unsupported state (II) is in a position where the measuring rod 19 is lowered, 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 Yatco will be described.
As shown in FIG. 4, the yatco 10 is used in a state in which the upper end is held by a cap 22 provided at the lower end of the rod 21 that is unloaded from the excavator and the pile 1 is held at the lower end of the yatco 10. The

  More specifically, 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 YATCO 10 are formed on the side surface of the cap 22. Further, a plurality of engaging convex portions 4 having the same configuration as the engaging convex portion 14 provided on the top of the Yatco 10 are also formed on the side surface of the pile 1 on the head 2 side. Then, the cap 22 is rotated in a state where the cap 22 is placed on the top of the YATCO 10, and the plurality of engaging concave portions 23 of the cap 22 are engaged with the plurality of engaging convex portions 14 provided on the top of the YATCO 10, respectively. Thus, the upper end of the Yatco 10 is held. Similarly, the connecting part 13 of the Yatco 10 is rotated in a state of covering the head 2 of the pile 1, and a plurality of engaging recesses 17 of the connecting part 13 are provided on the side surface of the pile 1 on the head 2 side. The heads 2 of the piles 1 are held at the lower ends of the yatcos 10 by engaging the engaging projections 4 respectively. At this time, the measuring rod 19 is set to the support state (I).

Next, a pile embedding method using a Yatco will be described.
FIG.5 and FIG.6 is explanatory drawing which shows the embedding method of the pile which uses a yatco in order of a process.
In the process shown in FIG. 5A, a heavy machine 30 such as a pile driver or an excavator is moved to a position where the pile 1 is buried, and is installed (set) on the work ground using an auger head 31. In the step shown in FIG. 5B, the ground 41 is excavated toward the support layer 42 while spraying cutting fluid (usually using water) from the tip of the auger head 31, and the agitated mud mass is the peripheral wall surface of the excavation hole 43. Knead. In the step shown in FIG. 5C, excavation is performed up to a predetermined burial depth D + a predetermined pile lower excavation length (for example, 1 m) by construction method.

  In the step shown in FIG. 6D, the auger head 31 is reversely rotated to open the enlarged wings, and the auger head 31 is reversely rotated while being made of cement milk (for example, based on a water cement ratio W / C = 60%) After injecting the root-setting liquid and enlarging the bottom 44 of the excavation hole 43 to form the root-solidifying part 45 (first step), the auger head 31 is rotated forward to close the expansion blade, and the pile circumference fixing liquid (for example, The auger head 31 is pulled up while injecting water-cement ratio W / C = 100%. The root hardening liquid (cement milk) is changed to a muddy state (hereinafter referred to as “mudified root hardening liquid (soil cement)”) through these steps.

  In the process shown in FIG. 6E, the pile 1 is suspended in the air and is inserted into the excavation hole 43 (second process). At this time, as described in the above-described usage method, the upper end of the yatco 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 connected by the connecting portion 13 at the lower end of the yatco 10. This is performed with the portion 2 engaged and held.

In the step shown in FIG. 6F, the lower end 5 of the pile 1 is set while being rotated in the root hardening portion 45 filled with the muddy-like root hardening liquid (soil cement) 51a, and the height position of the pile 1 is measured and measured. Inserting up to a predetermined embedding depth D while adjusting (third step).
Here, the measurement of the predetermined embedding depth D is performed using the measuring rod 19. That is, as shown in FIG. 4, the measuring bar 19 is moved to the unsupported state (II), the measuring bar 19 is lowered, and the lower end 19 b is abutted on the head 2 of the pile 1. And the measurement height position (height position from the reference point 40 to the supported part 19a) H of the measuring rod 19 descending according to the settlement of the head 2 of the pile 1 has reached a predetermined height position. Is measured by level. When the effective length of the measuring rod 19 (the length from the supported portion 19a and the lower end 19b) is L, the predetermined embedding depth (the length from the reference point 40 to the head 2 of the pile 1) D is D = It can be calculated from LH. Therefore, the pile 1 can be laid down to a predetermined embedment depth D by checking the measurement height position H of the measuring rod 19.

  And as shown in FIG. 7, the receiving stand 52 was previously arrange | positioned on the ground 40 near the opening end of the excavation hole 43, and it confirmed that the head 2 of the pile 1 reached the predetermined embedding depth D. If so, the cylindrical portion 12 of the Yatco 10 is fixed to the cradle 52 by means such as welding 53 (fourth step).

  Finally, as shown in FIG. 6G, the rod 21 is rotated in the reverse direction, and the cap 22 is removed from the upper end of the yatco 10 to complete the embedding of the pile 1 (fifth step).

  As described above, when the barrel portion 12 of the Yatco 10 is fixed to the cradle 52, before the pile is fixed due to hardening of the muddy-like root hardening liquid (soil cement) 51a, friction around the pile, or the like. Even if there is a possibility that the pile 1 will sink, the cap 22 can be separated from the upper end of the Yatco 10. This eliminates the need for the heavy equipment 30 to maintain the suspended state of the pile 1 until it no longer sinks, and allows the next excavation work to be performed. As a result, the usage rate of the heavy equipment 30 is increased, and the entire embedding work is performed. Efficiency can be improved.

  In addition, it is confirmed that the fixation of the Yatco 10 and the pedestal 52 has been fixed by the hardening of the mud-like root hardening liquid (soil cement) 51a, friction around the pile, etc., and the pile 1 no longer sinks. Can be done after.

  By the way, unlike the above-mentioned present invention, when the measuring rod 19 is provided outside the yatco, it is necessary to project a guide member or the like for holding the measuring rod 19 outside the yatco. When the Yatco is inserted into the excavation hole 43, the guide member or the like may be caught on the peripheral surface of the hole wall and cannot be inserted smoothly. Moreover, in order to prevent such a fear, it is possible to enlarge the hole diameter of the excavation hole 43, but in this case, a large amount of pile periphery fixing liquid is needed, or the center shift | offset | difference of the pile 1 becomes large. The inconvenience arises.

However, when the measuring rod 19 is provided inside the YATCO 10 as in the present invention, the YATCO 10 can be smoothly inserted into the excavation hole 43 and the diameter of the excavation hole 43 is required. Since it is not necessary to make it larger than this, the misalignment of the pile 1 can be reduced.
At the time of measurement, the measuring rod 19 is configured to descend in the hollow pipe 18, and it is not necessary to insert the measuring rod 19 into the ground and dig down at the tip of the measuring rod 19 to hit the head 2 of the pile 1. Measurement can be performed more quickly and accurately, and 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 a pinch structure is shown and described on the outer surface of the cylindrical portion 12 constituting the YATCO 10, but the embodiment of the present invention is not limited to the above embodiment. For example, a configuration in which a substantially L-shaped notch is connected to the upper end of the first window portion 15 in the cylindrical portion 12 and the supported portion 19a is held by the notch to achieve the support state (I). It may be.

1: Pile 2: Head 4: Engaging convex part 10: Yatco 12: Cylindrical part 13: Connection part 14: Engaging convex part 15: 1st window part (window part)
16: Support mechanism 16a: Latch 16b: Clamper 16c: Clamper 17: Engaging recess 18: Hollow pipe 18a: Second window (window)
19: Measuring rod 19a: Supported portion 19b: Lower end 21 of measuring rod: Rod 22: Cap 23: Engaging recess 30: Heavy machine 31: Auger head 40: Reference point 41: Underground 42: Support layer 43: Excavation Hole 44: Bottom 45 of excavation hole: Root consolidation part 51: Root consolidation liquid 51a: Mud-ized root consolidation liquid (soil cement)
52: Receiving base D: Embedding depth H: Measuring height position of measuring rod L: Effective length of measuring rod

Claims (6)

A Yatco that is connected to the head (2) of the pile (1) to embed the pile (1) in the excavation hole (43),
Cylindrical cylindrical part (12), hollow pipe (18) attached along the longitudinal direction inside the cylindrical part (12), and inserted into the hollow pipe (18) so as to freely advance and retreat And a measuring rod (19) that moves.   An elongated window portion (15) is formed in the cylindrical body portion (12), and the measuring rod (19) protrudes from the window portion (15) to the outside and can move freely in the window portion (15). The Yachko with a measuring rod according to claim 1, wherein a supported portion (19a) is provided.   The Yachko with a measuring rod according to claim 2, wherein a support mechanism (16) for supporting the supported portion (19a) is provided on the cylindrical body portion (12). A pile embedding method using a yatco with a measuring rod according to any one of claims 1 to 3, comprising at least:
A first step of injecting the root hardening liquid (51) into the borehole (43);
A second step in which the pile (1) connected to the yatco (10) attached to the cap (22) at the lower end of the rod (21) on the heavy machinery (30) side is built and inserted into the excavation hole (43);
The lower end (5) of the pile (1) is self-sunk while being rotated into a root-solidified part (45) filled with a muddy-type root-solidifying liquid (51a), and the pile (1) is measured with a measuring rod (19). A third step of sinking the pile (1) to a predetermined embedding depth (D) while measuring the height position of the head (2) of
A fourth step of disconnecting the connection between the cap (22) and the Yatco (10) after fixing the Yatco (10) to the cradle (52);
A fifth step of separating the pile (1) from the yatco (10) after confirming that the mudified root-setting liquid (51a) has hardened and the pile (1) no longer sinks;
A pile embedding method using a yatco with a measuring rod characterized by comprising:   The pile embedding method using the yatco with the measuring rod according to claim 4, wherein the yatco (10) and the cradle (52) in the fourth step are fixed by welding.   The method for embedding piles using a yatco with a measuring bar according to claim 4 or 5, wherein cement milk is used as the root hardening liquid (51).

Images