JP3923129B2 - How to connect split ring pieces. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for connecting divided ring pieces called segment pieces or the like and press-fitting them into the ground to construct a sinking body, and more particularly to a method for connecting the divided ring pieces.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a technique for constructing a subsidized body formed by connecting divided ring pieces called steel segment pieces or reinforced concrete segment pieces or the like by press-fitting into the ground. As this subsidence body, there are structures such as a shaft, a water collection well, and a water tank constructed in the ground.
[0003]
Furthermore, it has been proposed to use the above-mentioned subsidence for the construction of retaining walls when performing seismic reinforcement of piers such as highways, iron bridges, and overpasses. In other words, the seismic reinforcement of this pier is constructed as a retaining wall by press-fitting a cylindrical body constructed by connecting split ring pieces with a predetermined distance around the pier, using a hydraulic jack or the like. After excavating between the walls, the pier is reinforced with steel plates, cement, etc., using the space formed by excavation as the work space.
[0004]
An example of the connecting operation of such a sinking body is shown in FIG.
This figure shows an initial connection operation for forming a cylindrical sedimentary body, and the connection for forming the lowermost split ring 51 and the blade edge 53 is performed.
The blade edge 53 installed in a ring shape along the lower end edge of the lowermost split ring 51 is separated into four in the ring-shaped circumferential direction as a blade edge piece 55 in the illustrated example. Since the portion where the lower end of the blade edge 53 is in contact with the ground is small, if the number of separation is too large, the blade edge piece 55 becomes unstable and cannot stand on its own and falls. By reducing the number of separations, the blade edge pieces 55 that are self-supporting without falling down are welded and connected to each other, forming a ring shape.
[0005]
A split ring piece 57 is placed on the blade edge 53 thus configured, and the split ring pieces 57 are connected to each other to form the lowermost split ring 51. At the same time, the split ring piece 57 and the blade 53 are connected. These connections are made by welding.
[0006]
In this way, after the blade 53 and the lowermost split ring 51, and in some cases, the second and third split rings (not shown) are connected to form the lower part of the sinking body, Pressure is applied from above the uppermost split ring in the configuration state, and press-fitting into the ground is performed, and at the same time, excavation inside the split ring is performed.
After the press-fitting and excavation are performed, the next-stage split ring is connected and configured, and the press-fitting and excavation are performed again. In this way, the press-fitting and excavation are repeated, and a subsidence body having a cylindrical configuration in which the split rings are connected in the vertical direction is constructed in the ground.
[0007]
[Problems to be solved by the invention]
However, according to the above prior art, the split ring piece 57 and the blade edge piece 55 are separately manufactured at the factory and connected by welding or the like at the site. Therefore, there are the following problems.
(1) It takes a lot of time to perform the connecting work on site.
(2) In addition, in-site welding, it is difficult to perform careful welding, and the connection strength may be insufficient.
(3) In addition, there is a possibility that the dimensional accuracy in the entire horizontal plane of the split ring 51 and the blade edge 53 constituted by the connection may be insufficient.
[0008]
For example, when the sinking body is cylindrical as shown in FIG. 6 and the blade edge 53 is in a circular ring shape, the roundness accuracy of the blade edge 53 may be insufficient. In order to make this perfect circle accuracy sufficient, conventionally, it is necessary to pass a member 59 as shown in the figure in the radial direction of the blade edge 53 and to proceed with the connecting work while checking the radial dimension. In this case, the labor of the connecting work (1) is further required.
[0009]
The present invention has been made in order to solve the above-described problems, and does not require a labor for the connection work, the connection strength is sufficient, and the entire horizontal surface of the split ring 51 and the blade edge 53 constituted by the connection. It is an object of the present invention to provide a method for connecting split ring pieces with sufficient circumferential dimensional accuracy.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the inventors have made the following invention. That is, according to the present invention, in order to constitute the lowermost split ring of the sinking body, the suspended segment pieces (1) are passed through the bolt holes (17) of the joint plate (5) with bolts and nuts. Temporarily connecting to each other, a step of making the connected segment pieces a predetermined length in the circumferential direction, and a next segment piece (1) suspended from the self-supporting segment piece (1) In this state, a temporary connection in the circumferential direction is included, and when the lowermost split ring is formed by the temporary connection for one turn, the connection error is reduced by using the fastening fitting provided on the outer surface of the segment piece. A division for constituting a sinking body comprising a step of correcting and a step of welding the segment pieces (1) constituting the lowermost division ring together to complete the lowermost division ring In connection method Ngupisu, said a method of connecting split ring pieces, characterized in that attached cutting edge in a factory instead of field in the segment piece which constitutes the lowermost split ring is equipped.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
In this embodiment, the split ring piece is a steel segment piece 1 as shown in FIG. 1 or FIG. That is, the steel segment piece 1 is manufactured at a factory, and a pair of parallel linear joint plates 5 are welded to both ends of a pair of parallel curved main girders 3 to form a frame.
[0015]
Further, in the frame body, one middle main beam 8 is arranged in parallel to the pair of main beams 3. Each middle main beam 8 is passed to the joint plate 5 with a predetermined interval therebetween. Further, five vertical ribs 7 are arranged in parallel to the joint plate 5. The vertical ribs 7 are passed to the main beam 3 at a predetermined interval. A skin plate 9 is stretched on the outside of the main girder 3, the joint plate 5, the vertical ribs 7, and the middle main girder 8 to constitute the steel segment piece 1.
[0016]
That is, the main girder 3 is welded to the upper and lower edges of the square on the inner surface of the skin plate 9 that is curved but has a substantially square shape, and the joint plate 5 is welded to the left and right edges of the square. Is done.
[0017]
In addition, a backing plate 11 is partially stretched in the center of the steel segment piece 1 inside the vertical rib 7, and a bucket suspended by a wire of a heavy excavator makes contact, recoils, and rotates. This prevents the bucket position from becoming difficult to control.
[0018]
With such a steel segment piece 1 connected in the ring circumferential direction, a steel segment ring which is a split ring 13 is configured (FIGS. 2 and 3). A cylindrical set-up body 15 is configured in a state where the split rings 13 are connected in an axial direction (FIG. 2). For these connections, bolt holes 17 (FIG. 4) for connection are formed in the girders 3 and 5.
[0019]
However, in actual construction, the split rings 13 are not connected to each other in a ring unit, but the split ring pieces 57 constituting the split ring 13 of the next stage are arranged in a staggered manner on the lower split ring 13. Therefore, it is often placed one by one (see FIG. 2). The mounted divided ring pieces 57 are connected to each other to form a divided ring 53 of the next stage. At the same time, each divided ring piece 57 is connected to the lower divided ring 13. These connections are made by bolt fastening or welding.
[0020]
Now, the steel segment piece 13 which is the lowermost split ring piece among the plurality of split rings 13 to be overlaid is provided with a ring-shaped blade 19 in advance at the factory along the lower edge of the steel segment piece 13. Is installed (FIGS. 1, 3, and 4).
[0021]
That is, along the lower side of the main girder 3 welded to the lower end edge of the skin plate 9 constituting the lowermost steel segment piece 13, the blade edge outer plate 21 and the inside of the blade edge are provided by the length of the lower edge. A blade edge 19 made of a plate 23 is set.
[0022]
Since the blade edge outer plate 21 is welded along the outer surface of the lower end edge of the skin plate 9, the blade edge outer plate 21 is positioned outside the skin plate by the thickness of the blade edge outer plate, thereby forming a friction cut. By this friction cut, the ground is pushed outward with the press-fitting of the split ring 13, and the resistance due to friction between the skin plate and the ground is reduced. Moreover, this blade edge | side outer plate will be extended below from the outer peripheral end of the main girder 3 of a lower end edge simultaneously.
[0023]
Further, the blade inner plate 23 extends from the inner peripheral end of the main girder 3 at the lower edge toward the lower end of the blade outer plate 21 and is abutted at an acute angle and welded to the lower end. The welded blade edge outer plate 21 and blade edge inner plate 23 form a space 25 having a triangular cross section inside. Inside the space 25, reinforcing plates 26 having the same shape as the space 25 are arranged at a plurality of locations. The location of arrangement is a location that continues to the lower end of some of the vertical ribs 7.
[0024]
On the outer surface of the skin plate 9, below the left and right end portions, bolt assembly fittings 27 for temporary assembly for performing accurate welding at the time of connection in the ring circumferential direction are respectively attached at one place. This bolt or fastening fitting 27 has an L-shaped cross section, one side of the L-shape is welded 29 to the skin plate 9, and the other side protrudes to form a bolt hole 31. The bolt fastening joint fittings 27 are adjacent steel segment pieces 1 that face each other in pairs and can be fastened by bolts 33 and nuts 35 through which the bolt holes 31 are passed.
[0025]
Similarly, on the outer surface of the blade outer plate 21, below the left and right ends, similar bolt fastening joint fittings 27 are respectively attached at two locations.
[0026]
Hereinafter, with reference to FIG. 1, for example, the manufacturing procedure of the steel segment piece 1 which is a split ring piece having the blade edge 19 is as described below.
(1) The upper and lower main girders 3, 3 and the left and right joint plates 5, 5 are attached and welded to produce a frame.
(2) The reinforcing plate 26 is attached to the blade outer plate 21 and welded.
(3) The blade edge inner plate 23 is attached to the reinforcing plate 26 and welded. Therefore, the blade 19 is manufactured.
(4) The frame body (1) and the blade edge (3) are attached to the skin plate 9 and welded.
(5) The middle main beam 8 and the vertical rib 7 are attached and welded. The fastening fitting 27 is welded.
[0027]
However, in (4), either one of the frame and the blade edge may be manufactured and welded to the skin plate 9, and then the other may be manufactured and welded to the skin plate 9.
Further, the reinforcing plate 26 may be integrally provided by extending the lower end of the vertical rib 7.
Further, the blade edge 19 may be made shorter and welded to have a required length. That is, a block may be manufactured by using a shorter blade outer plate, a blade inner plate, and a reinforcing plate 26, and welding a plurality of blocks in the circumferential direction as needed in a factory.
[0028]
Next, a procedure for performing a connection operation and a construction operation for a sinking body will be described using the manufactured steel segment piece 1.
For example, the bottom two steel segment pieces 1 suspended by a crane or the like are temporarily connected by bolts and nuts passed through the bolt holes 17 of the joint plate 5.
[0029]
By this temporary connection, the connected steel segment pieces 1 have a sufficient length in the circumferential direction, can be self-supporting, and are prevented from falling. The self-standing steel segment piece 1 is temporarily connected in a state where the next steel segment piece 1 is suspended. In this way, when all the steel segment pieces 1 constituting one split ring 13 are temporarily connected, the connection error is corrected using the fastening fitting 27.
[0030]
In this state, the steel segment pieces 1 are welded to each other. Since the blade edge 19 is previously installed in the two lower steel segment pieces 1, the blade edge is also connected at the same time. After this welding, the fastening fitting 27 is removed by a welding burner.
[0031]
In addition, a second stage and a third stage split ring (see FIG. 2) are connected to the blade edge 19 and the lowermost split ring 13 in some cases. As in the prior art, this connection is performed by connecting the steel segment pieces 1 one by one for the staggered group. In this way, after the lower part of the sinking body is configured, pressure is applied from above the uppermost split ring in this configuration state, press-fitting into the ground is performed, and at the same time, excavation inside the split ring is performed. Done.
[0032]
After the press-fitting and excavation are performed, the next-stage split ring is connected and configured, and the press-fitting and excavation are performed again. In this way, the press-fitting and excavation are repeated, and a subsidence body having a cylindrical configuration in which the split rings are connected in the vertical direction is constructed in the ground.
[0033]
According to this embodiment, the following effects can be obtained.
As described above, by installing the blade edge 19 on the steel segment piece 1 which is a split ring piece, the connection between the steel segment piece 1 and the blade edge 19 in the field becomes unnecessary. This eliminates the need for connecting work on site. Moreover, the welding which connects between the steel segment piece 1 and the blade edge 19 can be performed at a factory, and can be performed carefully, and the connection strength becomes sufficient by that amount.
[0034]
Further, conventionally, the cutting edge piece 55 (see FIG. 6) can only be connected to a small connecting surface of the cutting edge piece 55. According to this embodiment, the connecting surface of the steel segment piece 1, that is, a joint plate, is used. Since the connection is performed at 5, the connecting surface becomes large, and the dimensional accuracy in the horizontal plane, that is, the perfect circle accuracy in this embodiment is sufficient.
[0035]
Furthermore, the temporary fastening of the steel segment 1 on which the blade edge 19 has been installed in advance can be performed by the bolt fastening joint fitting 27 using the fastening force of the bolt. Therefore, an error caused by thermal distortion caused by welding at the time of manufacture or connection can be corrected by the fastening force of the bolt. Therefore, the dimensional accuracy in the horizontal plane is further sufficient.
[0036]
(Other embodiments)
In the above embodiment, the friction cut is formed in the blade edge 19, but in other embodiments, the friction cut is not necessarily required, and the skin plate 9 and the blade edge outer plate 21 are located on the same plane. It may be.
[0037]
Further, in the above embodiment, the bolt assembly fitting 27 for temporary assembly is attached to each of the outer surfaces of the skin plate 9 below the left and right ends. Although it was attached to two places below the part, in the other embodiments, any number of bolt fastening joint fittings 27 may be employed.
[0038]
Moreover, in the above embodiment, the structure of the steel segment piece 1 is parallel to the main girder 3 by welding a pair of parallel linear joint plates 5 to both ends of the pair of parallel main girder 3. One middle main girder 8 is arranged, five vertical ribs 7 are arranged substantially parallel to the joint plate 5, and a skin plate 9 is stretched on the outside thereof. In the embodiment, such a structure is not necessarily required.
[0039]
That is, the number of middle main digits 8 may be two or more. Alternatively, it may not be provided at all.
Further, the number of the longitudinal ribs 7 may be 1, 2, 3, 4, or 6 or more. Alternatively, it may not be provided at all.
Further, instead of the joint plate 5 (see FIG. 1) continuously provided along the left and right edges of the skin plate 9, a plurality of discontinuous, for example, two joint members are attached by welding. May be.
[0040]
Further, the pair of parallel main girders 3 is not necessarily required. For example, a girder material may be welded diagonally to a substantially rectangular skin plate 9.
Further, the skin plate 9 does not necessarily have a substantially rectangular shape. It is only necessary that the surface on which the cylindrical set-up body 15 is developed can be covered with a single shape or with a number of uniform shapes in a mosaic shape without gaps.
[0041]
Moreover, although the above embodiment demonstrated as an example what was called the steel segment piece 1 as a division | segmentation ring piece, there exist several names in the division | segmentation ring piece. In this specification, regardless of the name, anything having the above structure is a split ring piece.
[0042]
Moreover, in the above embodiment, the settling body 15 constituted by the steel segment piece 1 has a complete circular cross section (FIG. 2). However, in other embodiments, it may not necessarily have a circular cross section. , It may be roughly square or oval. Even in such a case, an accurate approximate quadrangle or ellipse can be obtained by improving the dimensional accuracy in the horizontal plane.
[0043]
Moreover, in the above embodiment, the steel segment piece 1 comprised the division | segmentation ring 13 with which six were connected in the circumferential direction. In other words, the steel segment piece 1 is obtained by separating the dividing ring 13 into six pieces. However, in another embodiment, it may be divided into five pieces or less, or seven pieces or more.
[0044]
【The invention's effect】
As described above, according to the present invention, since the cutting edge is installed in advance in the split ring piece in the factory, the following effects can be obtained. (1) The connection between the split ring piece and the cutting edge becomes unnecessary at the connection work site, and the connection work is not required much. (2) Moreover, the welding which connects between a division | segmentation ring piece and a blade edge can be performed in a factory, and it is easy to perform polite welding. Therefore, the connection strength becomes sufficient by that amount. (3) Further, conventionally, the cutting edge piece can only be connected on the small connecting surface of the cutting edge piece. However, according to the present invention, not only the connecting surface of the cutting edge piece but also the connecting surface of the split ring piece is connected. obtained been conducted Runode, coupling surface is increased, the dimensional accuracy in the horizontal plane is sufficient.
[0045]
Further, a bolt fastening joint fitting can be performed using the fastening force of the temporarily assembled split ring piece cutting edge is mounted in advance volts. Therefore, errors caused by thermal distortion caused by welding during manufacture or connection can be corrected by the fastening force. Therefore, the dimensional accuracy in the horizontal plane is further sufficient.
[Brief description of the drawings]
FIG. 1 is a perspective view of a split ring piece on which a blade is installed according to an embodiment of the present invention.
2 is a perspective view of a sinking body constituted by connecting a plurality of split ring pieces in FIG. 1; FIG.
FIGS. 3A and 3B show a lowermost split ring configured by connecting the split ring pieces of FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a side view.
FIG. 4 shows the split ring piece of FIG.
(A) is a front view, (B) is a side view, (C) is a plan view, and (D) is a bottom view.
FIG. 5 is a perspective view for explaining the function of a bolt fastening joint fitting used when connecting the divided ring pieces of FIG. 1;
(B) is a side view.
FIG. 6 is a perspective view for illustrating a state of work of connecting conventional steel segment pieces.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel segment piece (split ring piece) 3 Main girder 5 Joint plate 8 Middle main girder 9 Skin plate 13 Split ring 15 Sedimentation body 19 Cutting edge 21 Cutting edge outer plate 23 Cutting edge inner plate 25 Space 26 Reinforcement plate 27 Joint for bolt fastening Metal fittings

Claims (1)

To make up the split ring at the bottom of the sinking body,
Temporarily connecting the suspended segment pieces (1) to each other with bolts and nuts passed through the bolt holes (17) of the joint plate (5) ;
As the linked segment pieces circumferential direction of the predetermined length, a step of Ru is self,
In the state which suspended the next segment piece (1) with respect to the said self-supporting segment piece (1), it has the process of temporarily connecting in the circumferential direction ,
When the lowermost split ring is configured by the temporary connection for one turn, a step of correcting the connection error using the fastening fitting provided on the outer surface of the segment piece ;
A step of welding the segment pieces (1) constituting the lowermost split ring together to complete the lowermost split ring ,
In a connecting method of split ring pieces for constituting a sinking body having:
A segment ring piece connecting method for split ring pieces, characterized in that a segment piece constituting the lowermost split ring is provided with a cutting edge attached at a factory rather than at the site.

Images