JP3404315B2 - Removal method and device for wall core pile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention perforates a relatively soft ground with an earth auger or the like, raises the earth auger while injecting cement milk into the perforation, and removes a soil cement column by hardening of cement milk and excavated earth and sand. When forming a continuous wall in the ground by arranging in rows, core piles made of H-shaped steel are propulsively lowered and buried in the soil cement pillars, and the upper and lower H columns are propelled during propulsion.
The present invention relates to a joining / separating method and apparatus for joining shaped steels and ascending and separating the uppermost H-shaped steel to the ground.

[0002]

2. Description of the Related Art Conventionally, for joining core pile materials for underground walls, bolts are joined by wrapping the entire surface of the pile with a joining plate.
In order to dismantle the joint after excavation, the mortar (soil) between the narrow columns must be removed before the joint bolt must be dismantled, and the joints on the flange side of the piles on the ground side where a large earth pressure is applied. It was extremely difficult to remove the bolt and its construction was not easy.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a core pile member made of H-section steel in the upper and lower stages, which is embedded in each column of a continuous underground wall by soil cement columns, by hanging the H-section steel in the uppermost stage. The purpose is to easily operate the joint with the lower H-section steel from the excavation side to separate the joint on the natural side.

[0004]

In order to achieve the above object, the present invention has the upper and lower ends of the upper and lower H-section steels facing each other, and extends over both the upper and lower outer surfaces of the upper and lower ground side and the excavation side flange. Connect the joint plates and bolt the upper and lower flanges to the joint plate.
In the state where the upper and lower H-section steels are screwed together with nuts, they are propelled into the ground as a core pile material of a vertical pillar continuous wall such as soil cement formed in the ground, and the upper or lower flange and the above From the nut that secures the joint plate to the ground side flange, unscrew the tip male thread of the bolt having the head on the excavation side flange, and remove the bolt through the excavation side flange to remove the upper and lower H-shaped steel. Joining is separated, and the H-section steel in the upper stage is pulled up to the ground in that state. Removing method of cored wall core pile. The above-mentioned first method in which a vertical force bar is provided at the center of the outer surface of the joining plate. The method for removing a continuous wall core pile according to the invention. A female screw hole for screwing a male screw end of the bolt into a joint plate used on the ground side is formed instead of the nut fixed to the ground side joint plate. Or, the method for removing the wall core pile according to the second aspect of the present invention collar between the ground side and the excavation side flange The bolt is inserted in the collar, the head of the bolt is engaged with the outer surface of the excavation side joint plate, and the male screw end is used as a female screw hole or a fixed nut of the natural side joint plate. The above-mentioned first to third screwed together
Out Wall Shinkui removal method land mountain side and the excavation side <br/> on the lower flange on the lower H-shaped steel which the upper and lower end faces in contact pairs earth mountainside same upright plane and excavation side same as described in any one of the invention
The ground side and the excavated part that are placed in the upright plane and are in contact with it
Has a side joining plate, and a bolt-nut screwed the upper and lower flanges and該接plywood, and upper or and lower flanges and the joining plate and welded to the joining plate side of the natural ground flange nut The detachable wall core pile in which the male screw portion of the long bolt having a head portion on the joint plate side of the flange on the excavating portion side is detachably screwed, and the upper and lower H-section steels can be detachably joined. the tip Onishi portion of the bolt joint plate used in the vertical direction of Chikarajo the removal device natural ground side flange side of the continuous wall Shinkui of projecting the above fifth aspect of the invention according to the outer surface center portion of the device junction plate Female wall hole to be screwed is formed in place of the nut fixed by welding on the one side flange side, and the removal device ground wall side and excavation side side of the connecting wall core pile according to the fifth or sixth aspect of the invention are provided. interposing a collar between the flanges, inserting the said bolt into the collar, excavation <br/> side the head of the bolt The outer surface of the plywood is constructed by removal apparatus of the communicating wall Shinkui according to any one of the fifth to seventh invention screwing the tip Onishi portion into the female threaded holes or fixing nut of the natural ground side joining plate It

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 11 and 12, a plurality of vertical holes are drilled in a straight line on a relatively soft ground by an earth auger, and cement milk is injected and stirred when the earth auger is raised to a soil. The cement column is formed and the underground continuous wall 8 is formed.

A core pile material 1 in which a plurality of H-shaped steels H and H are joined to each other in the upper and lower direction is hung down to the center of each column 8 and fixed by hardening of soil cement.

The upper and lower H-section steels H, H are in contact with each other at the upper and lower ends 1 ', 1 "along the center line in the vertical direction, and the upper and lower flanges 4, 4 are the upright surface of the natural ground 2 side and the excavation portion 3. The joint plates 5 and 5 are arranged in the side upright surfaces, and the joint plates 5 and 5 are in contact with both outer surfaces of the flanges 4 and 4, respectively.

The upper and lower flanges 4 and 4 and the joining plates 5 and 5 are bolt holes 12 formed at the corresponding positions of the flanges 4 and 4 and the joining plates 5 and 5, and a head portion 6'is excavated in the upper stage. The short bolt 6a is inserted into the 3 side, and the nut 6a 'is screwed onto the tip of the short bolt 6a on the inner surfaces of the upper flanges 4 and 4 and tightened. In the lower flange 4, the head 6'to the excavation part 3 side through the bolt holes 12 and 12 formed in both flanges 4 and 4 and the bolt holes formed in the joint plates 5 and 5 corresponding to the bolt holes 12 and 12.
Is arranged and the long bolt 6 is inserted into the flange 4 on the ground 2 side and the bolt hole of the joining plate 5, and the tip 6 ″ of the long bolt 6 is screwed into the nut 7 welded and fixed to the ground 2 side of the joining plate 5. Tighten and fix.

A plurality of stages of H-section steels H, H joined in this way
As described above, the core pile material 1 according to the above is pressed and propelled into the ground along the center line of each vertical column 8'and embedded in each vertical column 8 '.
The pillar-type underground continuous wall 8 shown in FIG. 12 can be formed.

One of the underground continuous walls 8 is the ground 2,
The other is the excavation part 3, which is buried in the space of the excavation part 3 with earth and sand after the burial of the sewers and buried vehicles 14 and 15 of the transmission line wiring path (see FIG. 10).

Before being backfilled, the uppermost H-section steel is pulled back to the ground from the lower-stage H-section steel so as not to project or be exposed above the ground. At that time, as shown in FIG. 1, the tip male screw portion 6 ″ of the long bolt 6 for contacting the nut 7 with the joint plate 5 on the excavation portion 3 side is attached to the bolt hole of the ground 2 side flange 4 and the ground 2 side joint plate 5. It is possible to unscrew (separate) from the nut 7 which is welded and fixed to the bolt hole on the ground 2 side of the ground side joint plate 5, and the long bolt 6 is shown in the phantom line in FIG. 1, FIG. 2 and FIG. 5B. As described above, it is possible to slide-separate (pull-separate) from the both flanges 4 and 4 and both joint plates 5 and 5, that is, the lower H-section steel to the excavation part 3 side. Both the upper and lower H-section steels H and H can be joined with the long bolt 6 to separate the long bolts 6 or 6 in either of the upper and lower stages, and the upper H-section steel side is not the long bolt 6 as described above. The long bolt 6 on the upper H-section steel side can be pulled out from the flanges 4 and 4 and the joining plates 5 and 5 to the excavation portion 3 side to be separated.

By rotating the head portion 6'of the long bolt 6 forward and backward by a spanner or other tool 16 (FIG. 5), the tip male screw portion 6 "can be attached to and detached from the fixing nut 7.

In the central portion of the outer surface of the joining plate 5, a vertical force bar 10 can be projected to reinforce the joining portion between the upper and lower H-section steels H, H, and the fixing nut 7 can be used as a substitute. The bolt holes of the joint portion 5 used on the mountain 2 side are formed as female screw holes 11 (Fig. 7),
The female screw portion at the tip of the long bolt 6 can be screwed into this.

Further, as shown in FIG. 8, a collar 12a (sheath pipe) is interposed between the natural ground 2 side flange 4 and the excavation section 3 side flange 4, and the long bolt 6 is inserted into the collar 12a. The head 6'of the bolt 6 is attached to the outer surface of the ground plate 2 side joint plate 5,
The tip male screw portion 6 ″ can be formed so as to be screwed into the female screw hole 11 or the fixing nut 7 of the ground side joint plate 5, thereby facilitating the escape sliding of the long bolt 6 to the excavation portion 3 side. Can be

In FIG. 12, 4'and 4'are wide flanges of H-section steel, FIGS. 13A and 13B and 5'in FIG. 14 are weak axis surface stiffening ribs of the joint plate 5, and in FIG. Reference numeral 17 is an upset, reference numeral 18 is a mountain retaining beam, and reference numeral 19 is backfilled sand.

[0016]

Since the present invention is based on the method and apparatus described above, the joining of the upper and lower stages in a plurality of stages of H-section steel drooped and propelled into each column of a column-row underground continuous wall is performed strongly and easily. Not only is it possible, but the top H-section steel and the bottom H-section steel
The effect of being able to easily operate the joint with the section steel from the excavation side to easily and easily separate the buried joint on the ground side and to easily remove the buried upright H-section steel from near the ground in the continuous wall. is there.

[Brief description of drawings]

FIG. 1 is a side view showing a core pile material joined / separated state of the present invention.

FIG. 2 is a side view of the uppermost H-section steel and the lower H-section steel in a separated state.

FIG. 3 is a side view of the uppermost H-section steel in a pulled-up state.

FIG. 4 is a perspective view of each part of the joint.

FIG. 5 (a) is a side view showing a joined state of bolts at upper and lower stages in a joined portion. (B) The figure is a side view of the separated state.

FIG. 6 is a front view of upper and lower flanges and a joining plate.

FIG. 7 is a partially cutaway plan view in the case where a female screw hole is formed in the joining plate.

FIG. 8 is a plan view of a state in which a bolt collar is interposed between the flanges.

FIG. 9A is a front view of a joining plate. (B) The figure is a front view of the long bolt.

FIG. 10 is a vertical cross-sectional view showing a state where an excavation space is formed between continuous walls.

FIG. 11 is a plan view taken along the line AA of FIG.

FIG. 12 is a plan view of a state in which a wide core pile material and a narrow core pile material are used for the continuous wall.

FIG. 13 (a) is a front view of a joined state in which weak axis surface stiffening ribs are provided on both sides of the joined plate. (B) is a side view of (a) as viewed from the right.

FIG. 14 is a plan view taken along the line BB of FIG.

[Explanation of symbols]

1 core pile material H H shaped steel 1 ', 1 "upper and lower edges 2 natural ground 3 excavation section 4 flange 5 joining plate 6 bolts 6'head 6 "male tip 7 nuts 8 standing columns continuous wall 9 ground 10 force lines 11 female screw holes 12a color

Claims (8)

(57) [Claims] 1. The upper and lower ends of the upper and lower H-section steels are in contact with each other, and the joint plates are in contact with both the upper and lower outer surfaces of the upper and lower ground side flanges and the excavation section side flange, and the upper and lower stage flanges and the joint plate are connected to each other. In the state where the upper and lower H-shaped steels are screwed together with bolts and nuts, they are propelled into the ground as a core pile material for a continuous wall of vertical pillars such as soil cement formed in the ground, and the upper or lower flange described above. And the joining plate are fixed to the ground side flange from the nut, the tip of the bolt having the head portion on the excavation side flange is unscrewed, and the bolt is withdrawn through the excavation side flange to remove the upper and lower H-shapes. Separate the steel joint, and in that state, press the H
A method of removing a continuous core pile, characterized by pulling shaped steel above the ground. 2. The method for removing a wall core pile according to claim 1, wherein a vertical force bar is provided at the central portion of the outer surface of the joint plate. 3. The connection according to claim 1 or 2, wherein a female screw hole for screwing the male screw portion of the tip of the bolt is formed in the joint plate used on the ground side instead of the nut fixed to the ground side joint plate. Wall core pile removal method. 4. A collar is interposed between the ground side and the excavation side flange, the bolt is inserted into the collar, the head of the bolt is engaged with the outer surface of the excavation side joint plate, and the tip male is connected. The method for removing a wall core pile according to any one of claims 1 to 3, wherein the threaded portion is screwed into a female threaded hole or a fixing nut of the ground side joint plate. 5. The ground of the upper and lower H-section steels whose upper and lower end faces are in contact with each other.
Side and excavation side on the lower flange land mountainside same upright plane 及
And the excavation part side are located in the same upright plane and touch the ground
A mountain side and the excavation side joining plate, and a bolt-nut screwed the upper and lower flanges and該接plywood, the upper or and a lower flange and the joining plate, the junction plate of natural ground flange <br /> Side is welded and fixed to the nut that is welded and fixed to the excavation side flange , and the male screw end of a long bolt having a head portion on the joint plate side is detachably screwed to attach and detach the upper and lower H-section steels. A detachable device for core wall piles that can be freely joined. 6. The removing device for a wall core pile according to claim 5, wherein a vertical force bar is provided on the central portion of the outer surface of the joining plate. 7. A claim of Mesunishiana screwing the tip Onishi portion of the bolt joint plate used in the natural ground side flange side, which is instead formed in the welding fixed nut on the natural ground flange side The device for removing a continuous wall core pile according to 5 or 6. 8. intervening color between natural ground side and the excavation side flange, inserted through the bolt into the collar, the outer surface of the excavation side joining plate the head of the bolt tip Onishi portion Is screwed into a female screw hole or a fixing nut of the ground side joint plate.
7. The device for removing a wall core pile according to any one of 7.