JP3139617U - Pile - Google Patents

Abstract

[PROBLEMS] When building a core material perpendicularly to a drilling hole, it is not limited to a soft ground but can also be applied to a hard ground, and the resistance to the inner wall of the drilling hole is small and accuracy is easy. Get a pile that can be built vertically.
A pile which is a core material 9 in a pile inserted into the excavation hole 10 as a core material 9 of an underground column or an underground wall formed by injecting a hardening liquid such as cement milk into the excavation hole. As a restricting member in the insertion direction, a belt-like member 11 projecting in an arc shape is attached to the symmetrical position of the outer peripheral surface of the pile along the length direction.
[Selection] Figure 1

Description

  The present invention relates to a pile that is built as a core material in an excavation hole when excavating an excavation hole for a retaining wall such as a soil column wall with an excavator.

  As construction of the soil column wall, an in-situ soil mixing method using a multi-axis excavator (Sile Mixing Wall, SMW) is known. As shown in FIGS. 7 and 8, the excavation shaft 5 is connected downward to a drive mechanism 4 including a hydraulic motor and a speed reducer, and a plurality (5 in the drawing) of the excavation shafts 5 are arranged in parallel. It has been made.

  The excavation shaft 5 is provided with an excavation head 5a at the tip, and an excavation blade 5b that also serves as a stirring blade with screw blades interrupted in the middle. Although not shown, the excavation shaft 5 is a hollow shaft that allows a caking liquid such as cement milk to flow inside, and can be poured out from the discharge port of the excavation head 5a.

  The drive mechanism 4 is suspended from a top sheave 3 of a leader mast 2 standing on a base machine 1 such as a crawler with a wire while the excavation shaft 5 is connected. Furthermore, the drive mechanism 4 engages the curved bracket 6 provided on the back surface with the leader 7 provided along the leader mast 2. In the figure, reference numeral 8 denotes a neck-like steady rest provided at the lower end of the leader mast 2, and the excavation shaft 5 penetrates vertically.

  The excavation shaft 5 is rotationally driven by the drive mechanism 4 and excavation is carried out in the shape of a cone with the excavation head 5a. During the excavation, a caking liquid such as cement milk is discharged from the excavation head 5a, and the soil is in situ in the soil. 9 to form a soil cement wall body of the preceding element a as shown in FIG.

  Similarly, the soil cement wall body of the succeeding element b is completely wrapped with the soil cement wall body of the preceding element a (for example, a trajectory corresponding to one excavation shaft), and is continuously and integrally formed with the underground continuous wall. To do.

  And when using this soil cement wall body as a retaining wall in the underground construction of construction and civil engineering, as shown in FIG. 10, H-section steel is built as a stress bearing material (core material 9).

  This core material 9 is suspended after a caking liquid such as cement milk is discharged and before the caking liquid hardens, and is suspended by a crane or the like. Start drilling the element.

  However, since there is a large gap between the inner peripheral surface of the excavation hole serving as the soil cement wall and the side surface of the core material 9, even if the core material 9 is driven vertically, the core material 9 moves by the amount of the gap. As a result, the core material 9 deviates from the center and is biased. That is, the vertical accuracy of the core material 9 is deteriorated. As a result, the core material 9 collides with an adjacent building or a building to be built.

  In addition, when excavating with a multi-axis excavator, the excavating tracks of the excavating shafts 5 are overlapped (overlapping), and when drilling holes to create the succeeding element, the leading element has a core material. In this state, since the core material is immersed in the excavation hole, it is difficult to clearly confirm the location of the core material from the ground.

  For this reason, the position of the core material 9 built in the preceding element is biased toward the succeeding element, or the H-shaped steel as the core material 9 is twisted in the excavation hole and the flange is directed toward the succeeding element. If the subsequent element is excavated without noticing such a state, the excavation shaft may come into contact with the core material of the preceding element during the excavation.

On the other hand, the following patent document shows a method of building a core material in a drilling hole while maintaining the vertical accuracy of the core material.
JP 2002-221950 A

  This is because the diameter of the excavation hole (vertical hole) is approximately the same as the width between the flanges of the core material (pile) made of H-shaped steel, and thus the gap between the side surface of the pile and the inner wall of the excavation hole This prevents the pile from moving or tilting.

  In the case of JP 2002-221950 A, the diagonal length of the core material (pile) made of H-shaped steel is larger than the diameter of the drilling hole, and the flange corner of the H-shaped steel does not fit in the drilling hole. In the conventional example, a press-fitting machine is used to forcibly build a corner portion.

  In the case of the conventional example, the ground that can be press-fitted with a press-fitting machine is limited to a soft stratum.

  When the length of the diagonal direction of the core material made of H-shaped steel is larger than the diameter of the drilling hole as in the conventional example, the flange corner portion protrudes from the drilling hole. For this reason, this portion is pushed in by the press-fitting machine as described above, but the press-fitting location is limited to the soft ground.

  Moreover, since the outer surface of the flange of the H-shaped steel is built in the excavation hole while the outer surface of the flange of the H-shaped steel is in sliding contact with the inner wall of the excavation hole, the contact area with the inner wall of the excavation hole becomes large and the resistance at the time of installation is large. The workability is not good.

  The present invention eliminates the inconvenience of the conventional example, and when the core material is built vertically to the excavation hole, the embedding location is not limited to the soft ground, and can be implemented on the hard ground. It provides a pile that has a low resistance to the inner wall of the slab and can be built vertically easily with high accuracy.

  In order to eliminate the inconvenience of the conventional example, the invention of claim 1 is characterized in that the core material of the underground column or underground wall formed by injecting a hardening liquid such as cement milk into the excavation hole, In the pile inserted into the excavation hole, as a regulating member in the insertion direction of the pile that is the core material, a strip-like member protruding in an arc shape is attached to the symmetrical position of the outer peripheral surface of the pile along the length direction It is what.

  The invention according to claim 2 is to set the protruding height of the protruding end so that a slight gap is formed between the protruding end of the belt-shaped member protruding like an arc and the wall surface of the excavation hole. It is what.

  The gist of the invention described in claim 3 is that the belt-like member protruding like an arc is arranged in the vicinity of the lower end of the pile.

  The invention described in claim 4 is characterized in that both ends of the belt-like member projecting in an arc shape are formed in the fixing portion to the pile, the protruding end portion and the fixing portion are widened, and the inclined portion connecting the protruding end portion and the fixing portion is provided. The gist is to form it narrowly.

  The gist of the invention described in claim 5 is that the narrow inclined portion is formed by bending both side portions of the belt-shaped member inward, and this bent portion is used as a reinforcing portion of the inclined portion.

  The gist of the invention described in claim 6 is that the belt-like members projecting in an arc shape are formed with the same width over the entire length in the length direction.

  According to this invention of Claim 1, the strip | belt-shaped member which protrudes in the shape of an arch along the length direction in the symmetrical position of the outer peripheral surface of the pile which is a core material is a drilling hole when inserting a pile into a drilling hole. By sliding in contact with the inner wall, the piles are prevented from being inserted in a biased manner from side to side, the band-like member functions as a regulating member when inserting the piles, and the piles can be inserted with high vertical accuracy.

  According to the second aspect of the present invention, since the slight gap is ensured between the projecting end of the belt-like member projecting in an arc shape and the wall surface of the excavation hole, the belt-like member is in close contact with the inner wall surface of the excavation hole. This prevents the band-shaped member from becoming a resistance to the insertion of the pile, and the band-shaped member does not hinder the insertion of the pile. And since the gap is very small, even if the pile sways left and right by this gap, this gap does not hinder the band-like member from functioning as a regulating member in the pile insertion direction. .

  According to this invention of Claim 3, the strip | belt-shaped member which protrudes in an arc shape can arrange | position a strip | belt-shaped member to the insertion tip of a pile, and functions reliably as a control member of an insertion direction by arrange | positioning in the lower end part vicinity of a pile. Can be made. In addition, the number of band-shaped members disposed can be minimized, and the band-shaped member can be prevented from becoming a resistance when a pile is inserted.

  According to this invention of Claim 4, by forming the adhering part to the pile formed in the both ends of the strip | belt-shaped member which protrudes in an arch shape wide, a strip | belt-shaped member can be reliably fixed to a pile, Moreover, a protrusion edge part In addition, by forming it wide, the sliding contact surface with the inner wall of the excavation hole is secured to the maximum, and by forming it on the curved surface, it is possible to prevent the bias in the insertion direction while minimizing the resistance during pile insertion.

  Furthermore, by forming the inclined portion connecting the projecting end portion and the fixed portion with a narrow width, it is possible to further reduce the resistance to the soil when the pile is inserted, and the pile insertion can be performed smoothly with high vertical accuracy.

  According to the fifth aspect of the present invention, the narrow inclined portion only needs to bend the both side portions of the belt-shaped member inward, so that the narrow member can be easily formed as a single sheet having the same width. it can. And this bending part becomes a reinforcement part of a narrow inclination part, and can ensure the intensity | strength of a strip | belt-shaped member.

  According to the sixth aspect of the present invention, when the belt-like member projecting in an arc shape is formed with the same width over the entire length in the length direction, there is no narrow portion and the resistance to the soil when inserting the pile is somewhat Although it becomes large, processing of the strip-shaped member becomes easy and can be easily manufactured.

  As described above, when the pile of the present invention is built vertically to the excavation hole, the arched band-shaped member that slides on the inner wall of the excavation hole is projected on the outer peripheral surface of the pile. The insertion direction at the time of pile insertion is regulated by the member, and vertical accuracy is easily ensured. In addition, the resistance between the belt-shaped member and the inner wall of the excavation hole can be reduced, and the erection place is not limited to the soft ground, and can be applied to the hard ground.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view showing a first embodiment of a pile according to the present invention, FIG. 2 is a perspective view showing the main part of the same, FIG. 3 is a side view of the same, and FIG. 4 is a plan view of the same. Since the underground continuous wall construction method has already been described, a detailed description thereof will be omitted here.

  The present invention relates to an H-section steel which is a pile built as a core material 9 in the excavation hole 10 in the last step of the construction of the preceding element in the underground continuous wall method, and is located near the lower end of the core material 9. Thus, a strip-shaped member 11 protruding in an arcuate shape is arranged along the length direction of the core material 9 as a restricting member in the insertion direction of the core material 9 at a symmetrical position (left-right symmetric position in the illustrated example) of the outer peripheral surface of the core material 9. Fixed by welding.

  The belt-like member 11 has both ends as flat portions as a fixing portion 11a to the core material 9, and a protruding end portion protruding in an arc shape as a sliding contact portion 11b that slidably contacts the inner wall of the excavation hole 10, and slides with the fixing portion 11a. The contact part 11b is formed wide.

  And the inclination part 11c which is a connection part of the adhering part 11a and the sliding contact part 11b is formed narrowly.

  As a method for forming the narrow inclined portion 11c, for example, the band-shaped member 11 is formed of a single member having the same width, and only the portion of the inclined portion 11c is bent inward in the width direction so that the width of the bent portion is reduced. Make it only narrow.

  In this case, the bent portion 11d is disposed in a rib shape inside the narrow inclined portion 11c, and has a function of reinforcing the inclined portion 11c.

  The reinforcing portion of the inclined portion 11c is not limited to the bent portion 11d, and the fixing portion 11a, the sliding contact portion 11b, and the inclined portion 11c of the belt-like member 11 are formed with different widths from the beginning. The reinforcing portion of the inclined portion 11c is not formed by bending, but a rib is separately provided inside the inclined portion 11c, or the inclined portion 11c is formed thick so as to reinforce the inclined portion 11c. May be.

  The protruding height of the sliding contact portion 11b, which is the protruding end, is such that the sliding contact portion 11b does not come into close contact with the inner wall of the drilling hole 10 when the strip member 11 is inserted into the drilling hole 10. It is set so that a slight gap is formed between the inner wall of the excavation hole 10.

  Next, the operation will be described with reference to FIGS. When the core material 9 is built in the excavation hole 10, a band-shaped member 11 protruding in an arc shape is fixed to the outer peripheral surface in the vicinity of the insertion tip of the pile that is the core material 9. The core member 9 is inserted into the excavation hole 10 while the slidable contact portion 11 c which is a portion is in sliding contact with the inner wall of the excavation hole 10.

  By the sliding contact between the sliding contact portion 11b and the inner wall of the excavation hole 10, the insertion direction of the core member 9 is restricted, and the core member 9 is inserted with vertical accuracy without being swayed or twisted from side to side.

  Further, at the time of this insertion, the sliding contact portion 11b does not come into close contact with the inner wall surface of the excavation hole 10, but keeps a slight gap so that the belt-like member 11 is prevented from becoming resistance to insertion of the core material 9. it can. And since the gap is very small, even if the core material 9 is shifted left and right by this gap, this gap prevents the band-like member 11 from functioning as a regulating member in the insertion direction of the core material 9. It will never be.

  And since the strip | belt-shaped member 11 has been arrange | positioned in the lower end part used as the insertion front-end | tip of the core material 9, it can be made to function reliably as a control member of an insertion direction. Further, the number of the belt-like members 11 can be reduced to a necessary minimum, and the belt-like member 11 can be prevented from becoming a resistance when the core material 9 is inserted.

  Further, since the fixing portions 11a to the core material 9 formed at both ends of the belt-like member 11 are formed wide, the belt-like member 11 can be securely fixed to the core material 9, and the sliding contact portion 11b which is a protruding end portion is also wide. By forming the slidable contact portion 11b on the curved surface while ensuring the slidable contact surface with the inner wall of the excavation hole 10 to the maximum, the resistance during insertion of the core material 9 can be minimized and the deviation in the insertion direction can be achieved. Can be prevented.

  By forming the inclined portion 11c that connects the sliding contact portion 11b and the fixing portion 11a with a narrow width, resistance to the soil at the inclined portion 11c to which the earth pressure is most greatly applied when the core material 9 is inserted can be reduced. Can be inserted smoothly with good vertical accuracy.

  The inclined portion 11c is the portion of the belt-like member 11 that receives the greatest resistance to soil. Even if this portion is formed to be narrow, the bent portion 11d exists on the inner side. Becomes the reinforcing portion of the narrow inclined portion 11c, and the strength of the belt-like member 11 can be secured.

  FIG. 6 shows a second embodiment, in which the band-like member 11 is formed to have the same width over the entire length of the fixing portion 11a, the sliding contact portion 11b, and the inclined portion 11c. In this case, since the width of the inclined portion 11c is wider than that of the first embodiment, the resistance of the soil is increased. However, since the sliding contact portion 11b is formed on a curved surface, the entire belt-like member 11 is the core. There is no hindrance to the insertion of the material 9.

  Rather, the second embodiment is easy to manufacture because it is not necessary to form the bent portion 11d, and can sufficiently withstand the resistance from the soil by the wide width of the inclined portion 11c.

It is a front view of the built-in state which shows 1st Embodiment of the pile of this invention. It is a perspective view of the important section showing a 1st embodiment of a pile of the present invention. It is a side view which shows 1st Embodiment of the pile of this invention. It is a top view which shows 1st Embodiment of the pile of this invention. It is a top view of the embedding state which shows 1st Embodiment of the pile of this invention. It is a front view of the built-in state which shows 2nd Embodiment of the pile of this invention. It is a front view of a multi-axis excavator. It is a side view of a multi-axis excavator. It is a top view of the excavation locus by a multi-axis excavator. It is a top view of the underground continuous wall which built the core material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base machine 2 Leader mast 3 Top sheave 4 Drive mechanism 5 Excavation shaft 5a Excavation head 5b Excavation blade 6 Curved bracket 7 Leader 8 Stabilization 9 Core material 10 Excavation hole 11 Strip member 11a Adhesion part 11b Sliding part 11c Inclination part 11d Bending Part

Claims (6)

  In the pile inserted into the excavation hole as a core material of an underground column or underground wall created by injecting a hardening liquid such as cement milk into the excavation hole, as a regulating member in the insertion direction of the pile that is the core material The pile which attached the strip | belt-shaped member which protrudes in an arcuate shape along the length direction to the symmetrical position of the outer peripheral surface of a pile.   The pile according to claim 1, wherein the protruding height of the protruding end is set so that a slight gap is formed between the protruding end of the belt-shaped member protruding in an arc shape and the wall surface of the excavation hole.   The pile according to claim 1 or 2, wherein the belt-like member projecting in an arc shape is disposed in the vicinity of the lower end portion of the pile.   The both ends of the belt-like member projecting in an arcuate shape are formed in a fixing portion to a pile, the protruding end portion and the fixing portion are formed wide, and the inclined portion connecting the protruding end portion and the fixing portion is formed narrow. The pile according to claim 3.   The pile according to claim 4, wherein the narrow inclined portion is formed by bending both side portions of the belt-shaped member inward, and the bent portion serves as a reinforcing portion of the inclined portion.   The pile according to any one of claims 1 to 3, wherein the belt-shaped member protruding in an arc shape is formed with the same width over the entire length in the length direction.

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