JP4507038B2 - Lift-up mechanism and construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lift-up mechanism for constructing a main pillar or a temporary pillar in advance, and using this as a reaction force pillar to lift a large frame assembled on the ground, and a lift-up method using the lift-up mechanism.
[0002]
[Prior art]
In the lift-up method, as shown in FIG. 13, a pair of left and right temporary columns constructed in advance, a main column, or a combination of these as reaction force columns a and a, a large frame b assembled between the reaction force columns, This is a construction method in which a rod d hanging from a lifting jack c installed at the top of the reaction force columns a and a is lifted and fixed to the upper ends of the reaction force columns a and a.
[0003]
[Problems to be solved by the invention]
When the main frame b is lifted, the reaction force columns a and a are bent by the weight of the main frame b in a direction that reduces the span. Therefore, when the distance between the left and right ends of the main frame b and the reaction column is small, The reaction columns interfere with each other, making it difficult to lift the column further. Therefore, in order to avoid this, the distance between the main frame and the reaction column is lifted relatively large. In such a case, the distance between the two is too large and the frame is directly fixed to the reaction column. It becomes difficult to do. For this reason, in the past, an adjustment material was provided between the two, and after the lift-up was completed, the dimensions between the main frame and the reaction force column were measured, the adjustment material was processed based on this, and then transferred to the construction site. It is attached to the reaction force column. For this reason, it takes time from the start of lift-up to completion, and the processing cost of the adjusting material and the installation cost thereof are generated, leading to an increase in cost.
The present invention eliminates the need for an adjustment material, thereby shortening the construction period and reducing the cost.
[0004]
[Means for Solving the Problems]
A first means is a lift-up mechanism that lifts a large frame 3 assembled between reaction force columns using a pre-installed column as a reaction force column 1, and presses the reaction force column 1 through a guide roller 11. Thus, a push jack 7 that presses the reaction force column 1 in the span expansion direction to widen the span is provided in the large frame 3, the reaction force column 1 is pulled in the span shortening direction, and the large frame 3 and the reaction force column 1. The pulling jack 13 for adjusting the distance between the jack and the reaction force column is provided at the upper end of the reaction force column, and the reaction force receiving member 14 for receiving the reaction force from the jack through the rod 15 is provided on the upper surface of the large frame 3 .
[0005]
As the second means, the torsion adjustment jack 16 having the first means and adjusting the front view plane of the main frame 3 in parallel to the vertical plane S including the axis of the reaction column 1 is installed in the main frame. 3 and reaction force column 1 were provided.
[0006]
As a third means, a first or second means is provided, and a guide rail 12 in the vertical direction to which the guide roller 11 can be pressed is attached to the upper part of the reaction force column 1, and a lower end portion of the rail. Was formed into a thin tapered portion at the bottom.
[0007]
As a fourth means, in the lift-up method in which the main frame 3 is assembled between the columns 1 erected at a predetermined interval and then the main frame is lifted by using the column as a reaction force column, it is opposed to both sides of the main frame 3. The guide jack 11 is actuated by operating the push jack 7 according to claim 1 in a state where the gap between the force pillar 1 is lifted with a small gap and the main frame 3 is lifted up to a predetermined height. A first step of expanding the span of the reaction column 1 until the main frame 3 reaches a fixed position by being pressed against
A second step of adjusting the span by operating the pulling jack 13 according to claim 1 and reducing the span of the reaction force column 1 after the large frame 3 is lifted to a fixed position;
After the span adjustment, there is a third step of temporarily fixing the large frame 3 directly to the reaction force column 1 at a fixed position.
[0008]
As a fifth means, a fourth means is provided, and after the third step, the torsion adjustment jack 16 according to claim 2 is actuated to the vertical surface S including the axis of the reaction force column 1. A fourth step of adjusting the front view plane of the large frame 3 to be parallel is further included.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1 and FIG. 2, a pair of left and right reaction force columns 1 and 1 are constructed in advance, and a large frame 3 such as a girder is assembled between these left and right reaction force columns using a crane 2 or the like. . At that time, the distance between the left and right ends of the main frame 3 and the reaction force columns 1 and 1 is set to about 15 mm. This interval is necessary for joining the raised frame 3 to the reaction force columns 1 and 1 with welding and high-strength bolts.
[0010]
After assembling the large frame 3 as described above, as shown in FIG. 3, a lift-up hydraulic jack 4 is installed at the top of the reaction force columns 1, 1, and the rod 5 suspended from each jack is attached to the large frame 3. It connects with the right and left both ends. Next, as shown in FIG. 4, the hydraulic jack 4 is operated to lift the large frame 3.
[0011]
On the other hand, as shown in FIGS. 7 to 9, push hydraulic jacks 7 are installed on the bottom surfaces of the left and right ends of the top plate 6 of the large frame 3. The jack is composed of a jack body 8 and a guide roller portion 9, and the jack body 8 is fixed to a reaction force receiving piece 9 a that hangs down from the top plate 6. On the other hand, the guide roller portion 9 is composed of a frame body 10 slidably attached to the lower surface of the top plate 6 and a guide roller 11 pivotally supported on the frame body. The frame body 10 is connected to the right side plate, and the frame body (not shown) located on the right side is connected to the ram of the jack body 8.
[0012]
On the other hand, the upper portions of the reaction force columns 1 and 1 are formed on a flat surface portion F substantially parallel to the left and right end surfaces of the main frame 3, and a vertical guide rail 12 is provided at the middle portion in the front-rear direction of the flat surface portion. Here, the upper part of the reaction force columns 1 and 1 to which the guide rail 12 is attached refers to a column part above the level M shown in FIG. The level M is a height at which the push jack 7 starts to operate. The jack pushes the left and right reaction force columns 1 and 1 bent by the weight of the main frame 3 outwardly in the left and right directions, and the reaction force column 1 and It plays the role of expanding the span of one. Further, the guide rail 12 up to the level N that is a predetermined distance above the level M is tapered so that the guide roller 11 can smoothly rise along the rail 12.
[0013]
Further, a pair of pulling hydraulic jacks 13 are installed on the upper end surfaces of the reaction force columns 1, 1 at a predetermined interval in the front-rear direction, and a reaction force receiver 14 is installed on the top surface of the top plate 6 of the frame 3. . The pulling hydraulic jack 13 is used to adjust the gap between the large frame 3 and the reaction force columns 1 and 1 when the large frame 3 is raised and reaches the upper end of the reaction force columns 1 and 1. In use, the hydraulic jack 13 and the reaction force receiver 14 are connected by the rod 15.
[0014]
Further, a hydraulic jack 16 for twist adjustment is provided on each of the front and rear both ends of the left and right ends of the main frame 3, and the jack ram is connected to both the front and rear of the flat surface portion F of the reaction column 1, 1. It can be pressed to the part. The jack 16 adjusts the displacement of the large frame 3 in the front-rear direction or the up-down direction after the clearance adjustment by the pull jack 13.
[0015]
Next, the operation of this embodiment will be described.
When lifting the large frame 3, the guide roller 11 of the push jack 7 does not come into contact with the reaction force columns 1 and 1 below the guide rail 12. When the guide roller 11 rises and contacts the taper portion at the lower end of the rail 12, it is confirmed that the guide roller 11 has contacted the rail 12 by a detecting means such as a limit switch or a pressure sensor or a monitoring device, and the push jack 7 is pushed. Operate.
[0016]
Then, the ram expands to widen the span of the reaction force columns 1 and 1 bent inward in the left-right direction by the weight of the large frame 3. For example, when the left and right gaps between the left and right end surfaces of the main frame 3 and the reaction force columns 1 and 1 are bent due to the weight of the main frame 3 due to the weight of the main frame 3, the dimension to be widened is 5 mm for each left and right. is there.
[0017]
The main frame 3 is lifted up to the level O (see FIG. 10) of the reaction force columns 1 and 1 while expanding the span of the reaction force columns 1 and 1, and the main structure 3 is assumed to be attached to the reaction force columns 1 and 1 after that. Then, the ram of the push jack 7 is moved backward.
Next, after connecting the pulling jack 13 to the reaction force receiving member 14 via the rod 15, the pulling jack 13 is operated, and the reaction force columns 1, 1 are pulled inward in the left-right direction, thereby causing the left and right ends of the main frame 3 to move. The gap between the surface and the reaction force columns 1, 1 is adjusted, and then the large frame 3 is temporarily fixed to the reaction force columns 1, 1.
[0018]
After temporary fixing, the twist in the longitudinal direction or the vertical direction of the frame 3 is corrected. Here, twisting means that the surface (front surface) viewed from the front of the main frame 3 is not parallel to the vertical surface S (see FIG. 12) in the left-right direction including the axis of the reaction force columns 1 and 1. In some cases, the twist correction is performed by operating the twist adjustment jack 16 to press the ram to both the front and rear portions of the flat surface portion F of the reaction force column.
[0019]
【The invention's effect】
In the invention according to claim 1 or 3, when the main frame is lifted up to a predetermined height, the reaction force column is pressed to widen the span, so that the main frame and the reaction column do not interfere with each other. Therefore, it is possible to reduce the distance between the two, and there is no need to provide an adjustment material between the two. Therefore, the frame can be directly fixed to the reaction force column immediately after the lift-up is completed. Installation costs are not required, reducing costs and shortening the construction period.
In addition, since the span is adjusted by pulling the reaction force column in the span shortening direction after the main frame is lifted up to a fixed position, it is possible to accurately assume the main frame.
[0020]
Since the invention according to claim 2 or 4 performs the twist adjustment of the large frame after the span adjustment, the large frame can be easily and quickly corrected to a parallel shape without using an adjustment member.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an assembly process of a large frame in a lift-up method according to the present invention.
FIG. 2 is also an explanatory view showing an assembly process of a large frame structure.
FIG. 3 is also an explanatory view showing a lift jack hydraulic jack installation step.
FIG. 4 is also an explanatory view showing a lift-up process for a large frame structure.
FIG. 5 is an explanatory view showing a step of reducing the span of the reaction force column in the same manner.
FIG. 6 is an explanatory view showing a process of fixing the frame to the reaction force column after the lift-up is completed.
FIG. 7 is a plan view of the reaction force column and the main frame when lift-up is completed.
FIG. 8 is a front view showing the upper ends of the reaction force column and the main frame when lift-up is completed.
FIG. 9 is also a left side view of the upper end portion of the frame structure.
FIG. 10 is a front view showing a state immediately after the push jack is activated.
FIG. 11 is also a left side view of the large frame.
FIG. 12 is a schematic diagram showing a vertical plane including the axis of the reaction force column.
FIG. 13 is a schematic explanatory diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction force column 3 Large frame 4 Hydraulic jack for lift-up 7 Push jack 11 Guide roller 12 Guide rail 13 Pull jack 16 Twist adjustment jack S Vertical surface

Claims (5)

A lift-up mechanism that lifts the frame 3 assembled between the reaction force columns using the pre-installed column as the reaction force column 1, and presses the reaction force column 1 through the guide roller 11 so that the reaction force column 1 A push jack 7 that presses 1 in the span expansion direction to widen the span is provided on the large frame 3, the reaction force column 1 is pulled in the span shortening direction, and the distance between the large frame 3 and the reaction force column 1 is adjusted. A lift-up mechanism, characterized in that a pulling jack 13 is provided at the upper end of the reaction force column and a reaction force receiving member 14 for receiving a reaction force from the jack via a rod 15 is provided on the upper surface of the frame 3 . A torsion adjustment jack 16 for adjusting the front view plane of the large frame 3 to be parallel to the vertical plane S including the axis of the reaction column 1 is provided on one of the large frame 3 and the reaction column 1. The lift-up mechanism according to claim 1. An upper and lower guide rail 12 to which the guide roller 11 can be pressure-contacted is attached to the upper part of the reaction force column 1, and the lower end portion of the rail is formed into a thin tapered portion at the bottom. The lift-up mechanism according to claim 1 or 2. In the lift-up method of assembling the frame 3 between the columns 1 that are erected at a predetermined interval, and then lifting the frame using the column as a reaction force column,
2. The push jack according to claim 1 is operated at a position where the both sides of the main frame 3 and the reaction column 1 are lifted with a small gap between them and the main frame 3 is lifted to a predetermined height. The first step of expanding the span of the reaction force column 1 until the main frame 3 reaches a fixed position by pressing the guide roller 11 to the reaction force column 1;
A second step of adjusting the span by operating the pulling jack 13 according to claim 1 and reducing the span of the reaction force column 1 after the large frame 3 is lifted to a fixed position;
And a third step of temporarily fixing the large frame 3 directly to the reaction force column 1 at a fixed position after the span adjustment. After the third step, the torsion adjustment jack 16 according to claim 2 is operated to adjust the front view plane of the main frame 3 parallel to the vertical plane S including the axis of the reaction force column 1. The lift-up method according to claim 4, further comprising four steps.

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