JP2829573B2 - Segment press-fitting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment press-fitting method capable of safely and efficiently performing excavation and press-fitting / sinking of segments.

[0002]

2. Description of the Related Art In a conventional segment press-fitting method, a protective ring is installed on the upper surface of a sunk segment as shown in a flowchart of FIG. Press-fitting equipment such as jacks, girders, support panels, etc. are installed, and after connecting to the earth anchor, excavation and press-fitting are laid down. Then, the connected ground anchors are separated, and press-fitting equipment such as jacks, girders, support boards, etc. After removing the protective ring, the next segment is placed on the sunk segment, and the above-mentioned steps are repeated to sunk the segment to a predetermined depth. For this purpose, the operations described in the above-mentioned and above are repeatedly performed for each of the excavation and press-fitting of each segment.

[0003]

However, in the case of the former, the operations described in the above (1) and (2) are required, so that much time is required, and not only the work efficiency is low, but also heavy objects such as a protection ring and a girder are required. There was a problem that it was dangerous because it involved working at heights. Therefore, the present invention is applied to each of the excavation and press-fitting of each segment.
It is an object of the present invention to provide a segment press-fitting method in which the operations described in and are omitted to achieve safety, efficiency, and labor saving of the operation.

[0004]

In order to achieve the above object, a segment press-fitting method according to the present invention is to attach a lifting jack to each of upright columns provided at four corners of the upper surface of the ground, A frame-shaped press-fitting device is constructed by arranging a press-down beam mounted at the lower end of the rod of each of the lifting jacks and moving up and down together with the rod of each jack for raising and lowering on the inner side surrounded by the support, and the press-down beam is constructed. A multi-stage and cylindrical segment is constructed on the upper surface of the ground below, and one arc-shaped segment unit constituting each step is connected to the upper end surface of the segment in a circular ring shape,
The segments are pressed downward by a predetermined depth by lowering the rod of each lifting jack on the upper surface and lowering the reduction beam, and after raising the reduction beam, the segment unit is similarly formed into a circular ring shape on the segment upper surface. The segments were connected, the pressing beam was lowered again, and the segments were pressed downward by a predetermined depth. By repeating these operations, the segments were sequentially pressed and sunk.

[0005]

[Function] Raise the rod of the lifting jack attached to each column, raise the pressing beam supported at the lower end of each rod, and create a space between the upper surface of the pressing beam and the segment that has been press-fitted and laid down. In this space, arc-shaped segment units constituting each stage are arranged one by one along the upper end surface of the segment and connected in a circular ring shape, and the rod of each lifting jack is lowered on the upper surface to lower the rolling beam. By pressing the segment downward by a predetermined depth and raising the rolling beam, the segment unit is similarly connected to the upper surface of the segment in a circular ring shape, and the rolling beam is lowered again on the upper surface to move the segment downward. By pressing a predetermined depth, by successively laying down the segments by repeating these operations, for example, the above-mentioned and ~ of the conventional method Work to be mounting is omitted all.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a segment press-fitting method according to the present invention will be described below with reference to the drawings. In the figure, reference numerals 1 denote earth anchors which are cast at four corners of the ground E at a segment slated to be laid, and a pair of columns 2 and 2 are vertically provided at front and rear portions of each earth anchor 1 at appropriate intervals. . Then, a locking member 3a is vertically slidably mounted so as to straddle each of the adjacent columns 2, 2, and
The upper end of the lifting jack 4 is mounted on the lower surface of the support rod a, and the lower end of the rod 5 of the lifting jack 4 is mounted on the locking member 3b which is vertically slidably mounted on the adjacent columns 2,2.

Reference numerals 6, 6 denote a pair of front and rear support beams horizontally laid between the columns 2, 2 disposed on the left and right sides of the columns 2, 2, respectively. Both ends are supported by the locking members 3b, 3b. Then, as shown in FIG. 2, a pressing beam 7 for pressing the cylindrical segment S downward is disposed between the supporting beams 6, 6 horizontally arranged in front and rear. The press-down beam 7 has a ring-shaped support frame 8 having substantially the same diameter as the outer periphery of the segment S, and supports the arm pieces 9 extending horizontally in the front-rear direction from both sides by the support beams 6 respectively. . Thereby, the segment press-fitting device M is constructed.

The segment S is constructed by stacking ring-shaped segments in multiple stages. The ring-shaped segment is formed by further dividing the ring-shaped segment equally (for example, 6 or 8).
One segment unit SU is connected for each stage to construct a segment body S of a required height on the upper surface of the ground E below the rolling-down beam 7 as shown in FIG. Then, the pressing beam 7 is stopped at a predetermined height position of each of the columns 2 and 2 as shown in FIG. 4, and a plurality of (for example, 6 to 8) segment units SU are formed as shown in FIG. Each of the segments S is suspended by a crane, lowered by using the central opening 8a of the support frame 8 formed in a ring shape of the reduction beam 7, and connected in a circular ring shape along the upper end surface of the segment S. Next, the ground E in the segment S is excavated, and each lifting jack 4 is operated with each locking member 3a fixed as shown in FIG. Is lowered, and the segment S
Is pressed downward to a desired depth, and press-fitted into the ground E.

When the pressing operation of the segment S is completed, the operation of each of the lifting jacks 4 is stopped, and then the rod 5 of each of the lifting jacks 4 is raised, and the upper end surface of the submerged segment S and the pressing beam are lowered. 7, a space of a required height is provided, and in this space, a plurality of segment units SU are stacked on the upper end surface of the segment S again as shown in FIG. Thereafter, the press-down beam 7 is lowered again on the upper surface to press the segment S downward, and the press-down and sinking is performed on the ground E.
Hereinafter, the same operation is repeated until the segment S reaches a predetermined depth.
To sink. The segment unit SU may be suspended using the space between the pressing beam 7 and the upper end surface of the segment S.

When the segment S is sunk to a desired depth, a slime treatment is performed, and a rebar cage (not shown) is suspended in the segment S by a press-in device M for the segment S and a normal crane. Place concrete and complete. In this case, a large crane was conventionally used to suspend the rebar basket, so the work became large, but since a normal crane can be used, the work is not large and the work becomes simple. .

As described above, by adopting the segment press-fitting method of the present invention, the segment S
Protective ring installation, jacking, girder, support plate, etc. press-fitting equipment installation, earth anchor connection, earth anchor separation, removal of jack, girder, support plate, etc. press-in equipment, removal of protection ring All the work can be omitted.

[0012]

As described above, in the segment press-fitting method according to the present invention, a frame-shaped press-fitting device is constructed on the ground surface,
A segment is constructed by connecting a plurality of segment units for each stage, and the segments are sequentially pressed and sunk by the press-down beam of the press-fitting device. In addition, it is possible to omit all the operations of removing, installing the press-fitting facilities, removing and connecting and removing the ground anchor, thereby obtaining an advantage of being able to work efficiently, shortening the working time, saving labor, It also has the advantage that labor savings can be achieved, and that work can be performed safely.

[Brief description of the drawings]

FIG. 1 is a front view of a segment press-fitting device according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a front view illustrating a use state.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

FIG. 6 is a front view illustrating a use state.

FIG. 7 is a front view illustrating a use state.

FIG. 8 is a flowchart of a segment press-fitting method according to the present invention.

FIG. 9 is a flowchart of a conventional segment press-fitting method.

[Explanation of symbols]

 2, 2 support 4 lifting jack 5 rod 7 reduction beam E ground S segment SU segment unit M press-fitting device

Continuation of the front page (56) References JP-A-59-195931 (JP, A) JP-A-3-81422 (JP, A) JP-A-56-108416 (JP, A) JP-A-61-5123 (JP) , A) JP-A-6-108473 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 23/08 E21D 1/03

Claims (1)

(57) [Claims] 1. A lifting jack is attached to each of the columns provided at the four corners of the upper surface of the ground, and a lower end of the rod of each of the lifting jacks is mounted on the inner side surrounded by each column. A press-down beam that moves up and down together with the rod of the jack for lifting is arranged to build a frame-shaped press-in device, and a multi-stage and cylindrical segment is constructed on the ground surface below the press-down beam, and a An arc-shaped segment unit constituting each step is connected to the end face one by one in a circular ring shape, and the rod of each of the lifting jacks is lowered on the upper surface to lower the pressing beam, thereby pressing the segment downward to a predetermined depth. After raising the rolling beam, the segment unit is similarly connected to the upper surface of the segment in a circular ring shape, and the rolling beam is lowered again to form the segment. Press down a predetermined depth downward,
A segment press-fitting method wherein segments are sequentially laid down by repeating these operations.