JP2020033821A - Steel rod insertion device and steel rod insertion method - Google Patents

Abstract

To provide a steel rod insertion device and a steel rod insertion method which can easily insert a steel rod to a soil cement column body while suppressing a steel material amount of the steel rod to be inserted.SOLUTION: Using a steel rod insertion device 10 which includes a rotation member 12 that has a female screw part 16 threaded to a male screw part 40 formed on an outer peripheral surface of a steel rod 38 inserted to an uncured soil cement column body 36 and is rotated by driving means 20, and a support member 14 which rotatably supports the rotation member 12 while regulating movement to a longitudinal direction of the steel rod 38 of the rotation member 12, the steel rod 38 is inserted to the soil cement column body 36.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steel rod insertion device and a steel rod insertion method.

  Steel rods are sometimes inserted into soil cement columns in order to improve the strength and toughness of the soil cement columns used as retaining walls and piles against horizontal force. Examples of a method of inserting a steel rod into a soil cement column include a method of inserting the steel rod by its own weight, a method of inserting the steel rod using a jig, and the like.

  For example, in Patent Literature 1, a construction jig is connected to a steel cage as a steel rod, and the reinforcement cage is built in a soil cement column while vibrating the construction jig. After the construction, the construction jig is soiled. A construction method for extracting from a cement column is disclosed.

Japanese Patent No. 2792968

  When a steel rod is inserted into a soil cement column by its own weight, it is necessary to use a steel rod having an excessive weight in order to insert the steel rod to a predetermined position.

  On the other hand, when the steel rod is inserted into the soil cement column by the jig, there is a possibility that a cavity is formed in the soil cement column when the jig is pulled out, and the proof strength of the soil cement column is reduced. Moreover, compared with the case where a steel rod is inserted into a soil cement column by its own weight, construction was not easy.

  In view of the above, the present invention provides a steel rod insertion device and a steel rod insertion method capable of easily inserting a steel rod into a soil cement column while suppressing the amount of steel material of the inserted steel rod. Aim.

  The steel rod insertion device according to claim 1 has a female screw part screwed into a male screw part formed on the outer peripheral surface of a steel rod inserted into an uncured soil cement column, and is rotated by a driving means. A rotation member, and a support member that rotatably supports the rotation member while restricting movement of the rotation member in the longitudinal direction of the steel bar.

  According to the above configuration, the female screw portion of the rotating member is screwed into the male screw portion formed on the outer peripheral surface of the steel rod, and the rotating member is rotated by the driving means, whereby the rotation is restricted by being inserted into the soil cement column. The rotating member rotates with respect to the steel bar. Here, since the rotating member is rotatably supported while the movement of the steel bar in the longitudinal direction is regulated by the support member, the rotating member does not move, the steel bar moves, and the uncured soil is moved. It is inserted into the cement pillar.

  As described above, by inserting the steel rod into the soil cement column using the rotational force of the rotating member as the driving force, it is not necessary to increase the amount of steel material of the inserted steel rod more than necessary. Can be easily inserted into the body.

  The steel rod insertion device according to claim 2 is the steel rod insertion device according to claim 1, wherein the support member includes a steel material placed on the ground on which the soil cement pillar is formed, An insertion hole is formed, and a plate fixed to an upper portion of the steel material, the rotation member is rotatably inserted into the insertion hole, and abuts on the plate to move in the longitudinal direction. A regulated projection is formed at the bottom.

  According to the above configuration, a steel material is placed on the ground on which the soil cement column is formed, the plate having the insertion hole is fixed to the upper portion of the steel material, and the plate is abutted on the plate to restrict longitudinal movement. A rotatable member having a projection formed at a lower portion is rotatably inserted into an insertion hole of the plate. Thus, the rotating member can be rotatably supported by the steel member and the plate while restricting the movement of the steel bar in the longitudinal direction.

  A steel rod insertion method according to claim 3 uses the steel rod insertion device according to claim 1 or 2, and rotatably attaches the rotating member to the support member while restricting movement in the longitudinal direction, By screwing the male screw part of the steel rod into the female screw part of the rotating member and rotating the rotating member by the driving means while restricting the rotation of the steel rod, the steel rod is made of the soil cement. Insert into pillar.

  According to the above configuration, the rotation member is rotatably mounted on the support member while restricting the movement of the rotation member in the longitudinal direction, and the male screw portion of the steel bar is screwed into the female screw portion of the rotation member, thereby restricting the rotation of the steel bar. By rotating the rotating member by the driving means, the steel rod can be inserted into the uncured soil cement column.

  As described above, by inserting the steel rod into the soil cement column using the rotational force of the rotating member as the driving force, it is not necessary to increase the amount of steel material of the inserted steel rod more than necessary. Can be easily inserted into the body.

  ADVANTAGE OF THE INVENTION According to this invention, a steel rod can be easily inserted in a soil cement pillar, suppressing the steel material amount of the inserted steel rod.

It is a whole perspective view showing the steel rod insertion device concerning a 1st embodiment. It is an elevation sectional view showing the steel rod insertion device concerning a 1st embodiment. (A)-(D) are process drawings which show the steel rod insertion method which concerns on 1st Embodiment. It is an elevation sectional view showing a steel rod insertion device concerning a 2nd embodiment. It is a sectional elevational view showing a steel rod insertion device concerning a modification.

<First embodiment>
Hereinafter, a steel rod insertion device and a steel rod insertion method according to the first embodiment of the present invention will be described with reference to FIGS.

(Steel bar insertion device)
First, the configuration of the steel rod insertion device 10 will be described. As shown in FIGS. 1 and 2, the steel rod insertion device 10 of the present embodiment has a rotating member 12 and a supporting member 14 that supports the rotating member 12 so as to be rotatable around an axis.

  The rotating member 12 is a cylindrical member made of, for example, a metal material, and has a female screw portion 16 formed on the entire inner peripheral surface having a cylindrical shape. On the other hand, the outer peripheral surface of the rotating member 12 is formed in a hexagonal cylindrical shape, and as shown in FIG. 2, a projection 18 projecting radially outward over the entire circumference is formed at the lower end of the outer peripheral surface of the rotating member 12. ing.

  Further, a driving means 20 is attached to the upper end of the outer peripheral surface of the rotating member 12. The drive means 20 is, for example, a center-hole type hydraulic torque wrench, and has a metal housing 22 in which a drive unit (not shown) is incorporated, and an insert 24 attached to the housing 22.

  A hexagonal through-hole corresponding to the hexagonal cylindrical outer peripheral surface of the rotating member 12 is formed in the insert 24, and the driving means 20 fits the insert 24 into the upper end of the outer peripheral surface of the rotating member 12. Thus, it is attached to the rotating member 12. The drive means 20 is not limited to a hydraulic torque wrench, and various known simple electric tools and the like can be used.

  The support member 14 includes a pair of steel members 26 extending in parallel at an interval from each other, and a plate 28 spanned over the pair of steel members 26. The pair of steel materials 26 is, for example, an H-section steel, and the lower flanges 26A are respectively mounted on the ground 30.

  On the other hand, the plate 28 is a rectangular plate member made of metal, for example, and both ends in the longitudinal direction are fixed to the upper portions of the upper flanges 26B of the pair of steel materials 26 by fixing members 32 such as vise. The fixing member 32 is not limited to a vise, and the plate 28 may be fixed to the steel material 26 by, for example, bolts and nuts.

  An insertion hole 34 whose inner shape is larger than the outer shape of the rotating member 12 and smaller than the outer shape of the projection 18 of the rotating member 12 is formed at a substantially central portion of the plate 28. The rotating member 12 is inserted into the insertion hole 34 so as to be rotatable around the axis. The protrusion 18 of the rotating member 12 abuts on the lower surface of the plate 28, thereby restricting the longitudinal movement of the rotating member 12. ing.

(How to insert steel bar)
Next, a method of inserting a steel rod into a soil cement column using the steel rod insertion device 10 will be described. First, as shown in FIG. 3A, a soil cement column 36 is formed on the ground 30.

  Specifically, while excavating the ground 30 using a plurality of drilling rods (not shown), cement milk is injected into the excavated portion, and the excavated soil and the cement milk are mixed and stirred. Thereby, as shown in FIG. 1, a plurality (four in the present embodiment) of uncured soil cement pillars 36 having a columnar shape partially continuous and formed are formed.

  Next, as shown in FIG. 3B, the steel material 26 of the support member 14 is placed on the ground 30. At this time, as shown in FIG. 1, the pair of steel materials 26 are arranged so that the longitudinal direction is the continuous direction of the soil cement column 36, and the soil cement column 36 is sandwiched between the soil cement column 36. Are respectively mounted on the outer peripheral portions of.

  After that, the plate 28 is fixed on the steel material 26 by the fixing member 32. At this time, the position of the plate 28 is adjusted so that the insertion hole 34 of the plate 28 is located near the axis of the soil cement column 36 in plan view.

  Next, as shown in FIG. 3C, the rotating member 12 is inserted into the insertion hole 34 from below the plate 28, and the driving means 20 is attached to the rotating member 12 above the plate 28, and the steel rod 38 is attached. It is inserted into the female screw portion 16 of the rotating member 12 from above. The steel rod 38 is, for example, a threaded rebar, and a male screw part 40 formed on the outer peripheral surface is screwed to the female screw part 16 of the rotating member 12.

  Then, after the male screw portion 40 of the steel rod 38 is screwed into the female screw portion 16 of the rotating member 12, the insert 24 is rotated by the drive unit of the drive means 20, thereby rotating the rotary member 12 about the axis together with the insert 24. .

  Here, the rotation member 12 is rotatably supported by the plate 28 of the support member 14 while restricting movement in the longitudinal direction. For this reason, as shown in FIG. 3D, the steel rod 38 moves downward and is inserted into the uncured soil cement column 36 by the rotation of the rotating member 12.

  In a stage before the steel rod 38 is inserted into the soil cement column 36, a jig or an operator (not shown) holds the steel rod 38 with a tool to allow the steel rod 38 to move in the longitudinal direction while moving around the axis. Preferably, the rotation is regulated. Thereby, it is possible to suppress the steel rod 38 from rotating together with the rotating member 12.

  On the other hand, after the steel bar 38 is inserted into the soil cement column 36 to a certain depth, the steel bar 38 is inserted into the soil cement column 36 by the frictional force between the outer peripheral surface of the steel bar 38 and the uncured soil cement column 36. Rotation around the axis is restricted.

  According to the above-described procedure, a plurality of steel rods 38 are inserted into one soil cement column 36 while being added. When the steel rods 38 are added, for example, the two steel rods 38 are inserted into the female screw portion 16 of the rotating member 12 in a butted state, and the butted part is welded when the butted part moves to below the rotating member 12. Is preferred. By adding the steel rod 38 below the rotating member 12, it is possible to prevent the butted portion (welded portion) of the steel rod 38 from catching on the female screw portion 16 of the rotating member 12. The method of adding the steel bars 38 is not limited to welding, and the steel bars 38 may be mechanically joined by, for example, a mechanical joint.

  After the insertion of the steel rod 38 into one soil cement column 36 is completed, the plate 28 is moved onto the adjacent soil cement column 36, and the above procedure is repeated, so that the plurality of soil cement columns 36 Steel bars 38 can be inserted in sequence.

(Action and effect)
According to the present embodiment, the female screw portion 16 of the rotating member 12 is screwed into the male screw portion 40 of the steel rod 38, and the rotating member 12 is rotated by the driving means 20, thereby being inserted into the soil cement column 36 and rotated The rotating member 12 rotates with respect to the steel bar 38 in which is regulated.

  Here, since the rotating member 12 is rotatably supported while the movement of the steel bar 38 in the longitudinal direction is restricted by the support member 14, the rotating member 12 does not move, and the steel bar 38 moves. And is inserted into the uncured soil cement pillar 36.

  As described above, by inserting the steel rod 38 into the soil cement column 36 by using the rotational force of the rotating member 12 as the driving force, the steel rod 38 is inserted into the soil cement column 36 by its own weight. There is no need to increase the amount of steel material of the steel bar 38 to be used more than necessary, and the steel bar 38 can be easily inserted into the soil cement column 36.

  In addition, as compared with the case where the steel rod 38 is inserted into the soil cement column 36 together with other jigs, it is possible to suppress a decrease in the proof stress of the soil cement column 36 due to the formation of a cavity in the soil cement column 36. Can be.

  Further, according to the present embodiment, the support member 14 is constituted by the pair of steel materials 26 placed on the ground 30 and the plate 28 fixed on the steel material 26. For this reason, the support member 14 can have a simple configuration, and the reaction force that the steel rod 38 receives from the soil cement column 36 when the steel rod 38 is inserted into the uncured soil cement column 36 is applied to the plate. 28 and can be received by the steel material 26.

  That is, in the present embodiment, since the steel material 26 is used as a reaction force receiver and the steel rod 38 is inserted into the soil cement column 36 using the simple driving means 20, the steel rod 38 is A wider construction yard is not required as compared with the case of inserting into the column 36. For this reason, adjustment with other work becomes easy, construction efficiency can be increased, and man-hours can be suppressed.

<Second embodiment>
Next, a steel rod insertion device according to a second embodiment of the present invention will be described with reference to FIG. Illustration and description of the same configuration as in the first embodiment will be omitted.

  As shown in FIG. 4, the steel rod insertion device 50 of the present embodiment includes a rotating member 52 and a supporting member 54 that supports the rotating member 52 so as to be rotatable around an axis. The rotating member 52 is a cylindrical member made of, for example, a metal material, and has a female screw portion 56 formed on the entire inner peripheral surface, similarly to the rotating member 12 of the first embodiment. Further, similarly to the first embodiment, a driving unit 60 is attached to the upper end of the outer peripheral surface of the rotating member 52.

  The support member 54 has a metal frame member 62 placed on the ground 30, an inner peripheral surface fixed to a lower end portion of an outer peripheral surface of the rotating member 52, and an outer peripheral surface fixed to the frame member 62. And a bearing 64. In the present embodiment, the bearing 64 is a ball bearing as an example. However, various known bearings can be used as the bearing 64.

  According to this embodiment, since the rotating member 52 is fixed to the frame member 62 via the bearing 64, the rotating member 52 is rotatable around the axis while the movement of the rotating member 52 in the longitudinal direction is restricted by the support member 54. Supported.

  Thereby, the male screw part 40 of the steel rod 38 is screwed into the female screw part 56 of the rotating member 52, and the rotating member 52 is rotated around the axis by the driving means 60, thereby similarly to the first embodiment. Can be inserted into the uncured soil cement column 36. In addition, according to the present embodiment, since the support member 54 is configured by the frame member 62 and the bearing 64, the support member 54 can have a simple configuration.

<Other embodiments>
As described above, the first and second embodiments of the present invention have been described, but the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention.

  For example, in the first embodiment, the support member 14 is configured by the steel material 26 made of the H-section steel and the plate 28, and in the second embodiment, the support member 54 is configured by the frame member 62 and the bearing 64. However, the support members 14, 54 of the steel rod insertion devices 10, 50 can rotatably support the rotary members 12, 52 while restricting the longitudinal movement of the steel bars 38 of the rotary members 12, 52. The configuration is not limited to the configuration of the above embodiment as long as the configuration can be used. Further, the steel material 26 is not limited to the H-shaped steel, and various shapes of steel and steel pipes can be used.

  Further, in the first and second embodiments, one steel rod 38 made of a threaded bar is inserted into the axis of the soil cement column 36, but the steel rod 38 inserted into the soil cement column 36 is used. Is not limited to the above embodiment. Further, the steel rod 38 is not limited to the threaded bar, but may be a bolt having an external thread portion 40 formed on the outer peripheral surface.

  Further, in the first embodiment, the projection 18 is formed on the entire periphery at the lower end of the outer peripheral surface of the rotating member 12, but the projection 18 does not need to be formed on the entire periphery of the rotating member 12, and at least one projection is provided. What is necessary is just to be formed in a part (partly).

  Here, an example of a method of inserting a plurality of (for example, three) steel rods 38 into the soil cement column 36 by the steel rod insertion device 70 will be described with reference to FIG. Note that the same reference numerals are given to the same configurations and methods as in the first embodiment, and description thereof will be omitted.

  As shown in FIG. 5, the plate 72 of the steel rod insertion device 70 has two through holes 74 in addition to the insertion hole 34 into which the rotating member 12 is inserted. First, the steel rods 38A and 38C are inserted into the two through holes 74, respectively.

  Next, the lower end of the central steel bar 38B screwed to the female screw portion 16 of the rotating member 12 is moved to below the rotating member 12 in the same manner as in the first embodiment. The steel bars 38A to 38C are connected to each other by the connecting member 76. Then, by inserting the steel rod 38B into the soil cement column 36 using the rotational force of the rotating member 12 as a driving force, the steel rods 38A and 38C connected to the steel rod 38B by the connecting member 76 are removed together with the steel rod 38B. Insert into the column 36.

  By applying a propulsive force to one central steel rod 38B by the steel rod insertion device 70 by the above-described procedure, a plurality of steel rods 38A to 38C can be inserted into the soil cement column 36 at the same time. The number of steel bars 38A to 38C to be inserted at the same time is not limited to three, and three or more other steel bars may be connected to the central steel bar 38B. Further, the steel rods 38A and 38C other than the steel rod 38B screwed to the female screw part 16 of the rotating member 12 do not need to have the male screw part 40, and may be a general-purpose deformed reinforcing bar or the like.

10, 50, 70 Steel rod insertion device 12, 52 Rotating member 14, 54 Support member 16, 56 Female screw part 18 Projection 20, 60 Driving means 26 Steel material 28, 72 Plate 30 Ground 34 Insertion hole 36 Soil cement column 38 Steel rod 40 Male thread

Claims (3)

A rotating member having a female screw portion screwed to a male screw portion formed on the outer peripheral surface of the steel rod inserted into the uncured soil cement pillar, and a rotating member rotated by the driving means,
A support member that rotatably supports the rotating member while restricting movement of the rotating member in the longitudinal direction of the steel bar,
A steel rod insertion device having a. The support member is configured by a steel material placed on the ground on which the soil cement pillar is formed, and an insertion hole is formed, and a plate fixed to an upper portion of the steel material,
The rotating member is rotatably inserted into the insertion hole, and a projection that is in contact with the plate and is restricted from moving in the longitudinal direction is formed at a lower portion,
The steel rod insertion device according to claim 1. Using the steel rod insertion device according to claim 1 or 2,
The rotation member is rotatably mounted on the support member while restricting the movement in the longitudinal direction, and the male screw portion of the steel bar is screwed to the female screw portion of the rotation member,
By rotating the rotating member by the driving means while restricting the rotation of the steel rod, the steel rod is inserted into the soil cement column,
Steel bar insertion method.