JPS6044454B2 - Construction method and equipment for installing structural pillars in vertical holes - Google Patents

Description

[Detailed Description of the Invention] The present invention uses the reverse drilling method, in which a structural pillar is suspended in a vertical position at a predetermined core position in a vertical hole that has been drilled in advance, and the lower end of this pillar is placed in front of the bottom of the vertical hole. The present invention relates to a construction method for connecting a structural pillar into a vertical hole in which it is fixed by a cementing fluid that has been cast, and to a connecting device that is applied to carry out this construction method.

Conventionally, various methods have been developed to connect the above-mentioned structural pillars, but these methods can be roughly divided into the following two methods.

(1) Concrete is placed at the bottom of the vertical hole up to the specified top of the hole, and after a certain period of time, workers descend directly onto the concrete, install anchor boats, advance plates, etc. that can hold the steel columns, and then A method of connecting steel columns, fixing them with concrete, etc., and then backfilling them. (2) Concrete is poured at the bottom of the vertical hole, and before it hardens, the verticality is corrected using a centering device, a column center correction device, etc., and the tip of the column is penetrated into the concrete and fixed. A construction method that involves backfilling.

Furthermore, the above-mentioned construction method (2) includes (i) a method of connecting only with the upper centering device, and (li) a method of connecting with the upper centering device and a correction device attached to the outer periphery of the structural pillar. It can be divided into methods for modifying the column core. However, the method (1) described above has disadvantages in that the worker must descend directly to the top of the hole, which makes the work dangerous) and increases the number of man-hours.

In addition, the method (1) of (2) above has the disadvantage that the erection accuracy of the columns is significantly reduced, and the method (Ii) of (2) above also requires a jack to be placed around the outer circumference of the lower end of the structural column. When building with the main column center extremely eccentric to the vertical hole center, if the gap between the hole wall and the outer wall of the column is extremely small, it is difficult to install jacks, etc. to that gap. Since no intervention is possible, not only is there a limit to eccentric construction, but there is also the drawback that the work is dangerous, similar to the method (1) above. Therefore, as a result of various studies in view of the drawbacks of the conventional construction methods described above, the present invention has been developed using a construction method belonging to the construction method (2) described above, which can be constructed even in a state where the vertical hole core and the structural column core are significantly eccentric. , A new method and device for erecting structural columns in vertical holes, which aims to ensure work safety, high precision, and efficient construction by correcting the column center at the upper part of the vertical hole. The gist of this is that a consolidating fluid is placed in advance at the bottom of the vertical hole, and before it hardens, it is placed in a centering device mounted on the excavator frame. A position measuring jig was attached to measure the column axis, but this was removed, and then the structural column was coaxially joined to the tip of a square copper pipe tube, and the structural column was inserted into the vertical hole together with the column. After hoisting it up and lowering it to a predetermined position, Yatsutoko restrains the two axes using a centering device, lowers it further, and penetrates the lower end of the structural column into the solidifying fluid at a preset position. In this state, the lower end of the Yatsutoko is operated with a built-in hydraulic cylinder to make the column core vertical with a plumb bob, and then the lower end of the post is turned into a solidifying fluid. The reason is that it was fixed and removed.

The present invention will be described in detail below based on drawings showing specific examples of implementation.

Prior to the first invention of the present application, the structure pillar erection device of the second invention will be explained. In FIGS. 1 to 9, the structure pillar 1 is jointed at the tip as a coaxial core, and the vertical hole
and a centering device 5 that performs centering of the structural pillar 1 that is installed on an excavator mount 4 placed on the ground G and suspended through the shaft 3; The center position measuring jig 6 is installed on the centering device 5 to measure the position of the column center.

That is, as clearly shown in FIGS. 1 to 3, the above-mentioned YATSUKO 3 has cylinders 8 built into each of the four sides of the lower end of the square steel tube 7, and each output shaft 8a is connected to the square steel tube 7. Each of them protrudes outward and is detachably connected to a distance bar to be described later, and a centering plate 9 and a plumb bob 10 are built into the center of the lower part so as to be visible through a window hole 11 opened in the square steel pipe 7. This plumb bob 10 can be locked by a locking mechanism (not shown) when not in use, and level stoppers 12, 1 and 2 are protruded symmetrically from the upper outer periphery of the square steel pipe 7, and level stoppers 12, 1 and 2 are protruded from the lower part. Level measurement scale 13
......, and a hydraulic stop valve 14 at the upper end.
. . . are connected to each of the cylinders 8 .

In this way, this guy 3 fixes the plate-shaped adapter 16, which is substantially larger than the cross section of the square steel pipe 1, to the lower end jig 7a of the square steel pipe 7, which is the main body, by screwing or the like.
The adapter 16 and the flange 1a at the upper end of the structural pillar 1 are fixed with bolts 17, so that the structural pillar 1 can be removably connected with the structural pillar 1 as a coaxial core.

Further, the centering device 5 is movable in the Y-axis direction by engaging a base frame 18 formed of H steel or the like and rails 19 on the base frame 18 with wheels 20. a Y-truck 21 disposed on the Y-truck 21; an X-truck 24 disposed movably in the X-axis direction by engaging wheels 23 on the rails 22, 23 on the Y-truck 21; A rotary table 27 is arranged so as to be rotatable and fixable with rolling rollers 25 and rotation locks 26 interposed therebetween, and guide rollers 28 are arranged on the four sides of the rotary table 27.・
- and two level adjustment jacks 29, 29 installed oppositely on a rotary table 27. Each of the guide rollers 28 is provided to guide the four sides of the shaft 3, taking into consideration the lowering of the joint between the structural pillar 1 and the shaft 3. The roller can be raised upwardly via the arm 28a, and the position of the roller can be relatively adjusted in the Y-axis direction and the X-axis direction by an adjustment screw 28c screwed onto the base 28b. The Y cart 21 and the X cart 24 can be fixed to stoppers 30 and 31, respectively, at arbitrary adjusted positions, and such adjustment work can be performed on a work walkway 32 provided outside the base frame 18. It's summery.

The center position measuring jig 6 also has a cone-shaped target 34 at the center of the upper surface of the substrate 33, as clearly shown in FIGS. 7 and 8.
Also, in the orthogonal direction, ■-shaped targets 35, 35, 35, 35
are provided respectively, as well as perpendicular break lines 36, 3.
6 is engraved therein, and furthermore, a drop guide 37 is integrally hung from the lower surface of the substrate 33, and on the centering device 5, each of the guide rollers 28... Fit and arrange the drop guide 37 to the structure pillar 1.
It is now possible to measure the center position of the

Next, a method for erecting a structural pillar, which is the first invention of the present application, which is constructed using the erecting apparatus having the above-mentioned configuration, will be explained.

A vertical hole 2 in which the structural pillar 1 will be erected is first drilled, but as shown in FIGS. In the installed state, the casing 38 is press-fitted to a predetermined depth, excavation is performed in this state, and after processing the slime, the reinforcing bar cage 39 is
A tremie pipe 40 is installed at the bottom of the drilled vertical hole 2 as shown in Fig. 14, and a consolidating fluid a such as concrete is poured to a predetermined top as shown in Fig. 15. After that, the tremie tube 40 is pulled out.

The construction method described above is the same as that of a normal Benoto column, but according to the present invention, the structural pillar 1 is erected according to the procedure shown below before the solidifying fluid a hardens. That is, the above-mentioned centering device 5 is placed on the excavator stand 4 as shown in FIGS.
Set as shown in Fig. 15. Prior to this work, the transit 41 is set in a position where it can measure the structural column center in the X-axis and Y-axis directions. Next, as shown in FIG. 7, the center position measuring jig 6 is placed on the centering device 5, and a guide 37 is fitted between each guide roller 28. Attach by clamping with...

In the X-axis and Y-axis directions, according to the measurement of the transit 41,
Move the X dolly 24 and Y dolly 21 to a position where the center cone-shaped target 34 of the core position measuring jig 6 matches the column core, and at this position, the Y dolly 21 and the X dolly 24 move the stoppers 30, 31. Fix it with. Next, the rotary lock 26 is released, the rotary table 27 is operated, and the cone-shaped target 34 and the ■-shaped target 35 are rotated so that they are aligned in a straight line around the column axis, and after positioning, the rotation lock 26 Turntable 2 at
Lock 7. With the above operations, the position of the structural pillar 1 is set in a plane by the centering device 5.

Next, the center position measuring jig 6 is removed from the centering device 5.

At this time, by loosening the adjustment screw 28c, the guide roller 2
Step 8 is performed by retreating and releasing the clamping of the dropping guide 37. After that, attach the bolt 17 and
. . , and as shown in FIG. Hang it into vertical hole 2. At this time, each guide roller 28 is rotated upwardly outward using the base end of its arm 28a as a fulcrum, and each guide roller 28 is
8. Leave a wide space between each other.

When the structural pillar 1 is lowered into the vertical hole 2 by the yutoko 3 and the joint portion 46 of both has been lowered below the centering device 5, each guide roller 28 is reversed and returned to the inside, respectively, and the yutoko 3 is lowered into the vertical hole 2. 3 and restrain the robot 3 in the X-axis and Y-axis directions as shown in FIGS. 9 and 17.

Furthermore, distance bars 43 are connected to the ends of each output shaft 8a of each cylinder 8 built into the Yatsutoko 3 according to the vertical hole center and column center positions. Connecting.
In this case, the distance bar 43 is a normal one that can be adjusted to expand and contract in the axial direction and can be held at any desired length.

After this, the structure pillar 1 is further lowered by the Yatsutoko 3, and the tip of the structure pillar 1 is pre-cast while measuring the level with the scale 13 of the Yatsutoko 3 until it reaches a preset position. Penetrate into fluid a.

At this time, the Yatsutoko 3 receives the stoppers 12, 12 with the level adjustment jacks 29, 29 of the centering device 5, and finely adjusts the level by operating the jacks 29, 29. Connect the unit and the hydraulic stop valve 14 at the upper end of Yatsutoko 3 with hoses.

Next, after unlocking the down swing plate 10 built into the Yatsutoko 3, each hydraulic cylinder 8 at the bottom of the Yatsutoko 3
...... arbitrarily expand and contract, and move plumb bob 10 to window hole 1.
1, align the center with the center of the not-illustrated yoke 3 made on the centering plate 9. This work is carried out on a work platform 4 suspended in the vertical hole 2 from the excavator stand 4, as shown in FIG.
This is carried out by a worker 45 looking into the plumb bob 10 from the perforation 11 above the hole 11, giving instructions to an outside worker, and operating each hydraulic cylinder 8 respectively. The distance bar 43...
. . . is locked in a state in which the expansion and contraction are adjusted by the operation of the hydraulic cylinder 8 .

By performing the level adjustment and centering by Yatsutoko 3 in this way, the structure pillar 1 is coaxially connected with Yatsutoko 3, so it can be erected at a predetermined position at a predetermined level with respect to the vertical hole 2. It turns out.

After performing the centering operation of the rod 3 as described above, if the hydraulic stop valve 14 is closed, the rod 3 and the structure pillar 1 will be held at the set positions, so they will be held in this state and solidified. The structure pillar 1 is fixed by hardening the fluid a. Next, once the Yatsutoko 3 is separated from the main pillar 1, the Yatsutoko 3 is removed using a crane 42, etc., the casing 38 is pulled out, the excavator mount 4 is moved, and the area around the pillar is moved as shown in Fig. 19. After excavation and backfilling, construction of Structure Pillar 1 is completed.

In this case, the structural pillar 1 used is a square steel pipe 7 filled with expanded concrete in advance. If such a structural pillar 1 is used, the tip will bear pressure against the temporary load, reduce the amount of penetration into the bottom solidifying fluid a of the vertical hole 2, and increase the rigidity. By increasing the size, deformation during backfilling can be avoided, and the fluid for solidifying inside the vertical hole 2 can be connected! The connecting part can be simplified.

In addition, Fig. 10 A, C] and C show modified examples of the yang joint in which the structural pillar 1 is installed eccentrically with respect to the vertical hole 2, and A and C show the axial center of the vertical hole 2. This is a case where the axis c of the main pillar 1 is built with extreme eccentricity with respect to b, and the mouth is built with a slight eccentricity, and even in the cases shown in A and C, the hydraulic pressure By using YATSUTOKO 3 which has a built-in cylinder 8..., it is possible to build it up.

As explained above, according to the construction method for structural pillars according to the present invention, the center position measuring jig 6 is set on the centering device 5 mounted on the excavator frame 4, and the After the center position in the Y-axis direction is set by operating the centering device 5, the center position measuring jig 6 is removed, and the structure pillar 1 is connected to the tip of the shaft 3 as a coaxial center and suspended in the vertical hole 2. The upper part of the Yatsutoko 3 is moved in two axial directions by the guide roller 28 of the centering device 5. While restraining and holding it at the set center position, operate the hydraulic cylinder 8 built into the bottom of the Yatsuko 3 (while operating the hydraulic cylinder 8...), align the built-in plumb bob 10 with the center of the Yatsuko 3. Since it is fixed in the solidifying/fluid material a in such a state, even when the vertical hole core and one structural pillar core are significantly eccentric, erection is possible. Since it is possible, vertical hole 2
The structure pillar 1 can be erected with high precision at any position,
Therefore, it is possible to construct all columns including the outer peripheral pillars, and as a result, there is no need to share the structural load with the outer peripheral mountain retaining walls, reducing the rigidity of the retaining walls and reducing the number of peaks in the deep upper layer of the supporting layer. There is an advantage that the cost of mountain retaining walls can be reduced by shortening the retaining wall length.

In addition, the centering work of the structural pillar 1 is performed by a worker using the plumb bob 10 built into the Yatsutoko 3 at the joint part 46 with the Yatsutoko 3.
This can be done visually, and the worker does not have to go down to the bottom of the vertical hole 2, improving work efficiency and safety.The operation is simple, so the work time can be shortened. This has the advantage of reducing the cost of structural pillar construction by reducing the number of man-hours and construction time.

Further, according to the device of the present invention, since the device is compact and easy to operate, it has the advantage that it can be used when implementing the above-mentioned construction method to erect the structural pillar 1 with high precision and in a short time. be.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the method of erecting a structural pillar in a vertical hole and its equipment according to the present invention, and Figure 1 is a front view of the Yatsutoko, and Figures 2 and 3 are Figure 1. ■−■ line in,
■-■ line enlarged cross-sectional view of each arrow, Figure 4 is a plan view of the centering device, Figure 5 is a vertical side view of the centering device, and Figure 6 is an enlarged vertical cross-section of the level adjustment jack in the centering device. Figure 7 is a plan view showing the center position measuring jig set on the centering device, Figure 8 is a side view of the center position measuring jig, and Figure 9 is a side view of the center position measuring jig.
The figure is a side view showing the state in which the main pillar is erected together with the Yatsutoko, Figure 10 A, C, and C are plan views showing examples of the arrangement of the main pillar and the main pillar installed in the vertical hole, respectively, and Fig. 11 or first
Figure 9 is a vertical sectional side view showing the construction procedure for the structural pillars in order. 1... Structure pillar, 2... Vertical hole, 3...
... Yatsutoko, 4... Excavator mount, 5...
... Centering device, 6... Center position measuring jig, 8.
... Hydraulic cylinder, 10 ... Plumb swing,
18... Base frame, 21... Y trolley, 24... X trolley, 27... Rotating table, 28... Guide roller, 29... - Rubel adjustment jack, 33... board, 34... cone-shaped target, 35... ■-shaped target.

Claims (1)

[Claims] 1. A centering device in which a consolidating fluid is poured into the bottom of a pre-drilled vertical hole and installed on an excavator mount before the consolidating fluid hardens. After measuring the column axis by attaching a core position measuring jig to the holder, remove it, and then join the structural column to the tip of a square steel pipe tube as a coaxial core, and insert the structural column together with the column into the vertical hole. After hoisting it up and lowering it to a predetermined position, Yatsutoko restrains the two axes using a centering device and lowers it further. At a preset position, the lower end of the structural column penetrates into the solidifying fluid, and then In this state, the lower end of the Yatsutoko is operated by a hydraulic cylinder built into it to make the column core vertical with a plumb bob, and the lower end of the rear pillar is fixed in a solidifying fluid, and the Yatsutoko is removed. A distinctive construction method is the erection of structural pillars into vertical holes. 2. A shaft that coaxially joints a structural pillar at the tip and suspends it into a vertical hole, and a centering device that is installed on an excavator mount and centers the structural pillar that is suspended through the shaft. , and a center position measuring jig that is installed on the centering device to measure the column center position. The center position measuring jig is equipped with a Y-carriage, an 1. A device for erecting a structural pillar into a vertical hole.