JP4312130B2 - Steel segment and method for manufacturing steel segment - Google Patents

Description

  The present invention relates to a steel segment used for an underground structure, in particular, a steel segment including a reinforcing member, and a method for manufacturing the same.

As a construction method for urban underground structures (vertical shafts, manholes, bridge substructures, bridge reinforcement, etc.), it has excellent workability without affecting neighboring structures and surrounding living environments (groundwater, vibration, noise, etc.) (The construction space is narrow, the construction period is short, the members are small and lightweight, etc.) and the applicable range is wide (the shape and size can be selected arbitrarily, and the corresponding ground is wide, etc.). The press-fit method (registered trademark) is frequently used.
Such an urban ring press-fitting method is to produce steel segments in an arc shape or straight line in a plan view in a factory, and connect the steel segments to each other at a construction site to form a ring (round, oval, etc.) An annular body is pressed into the ground. At this time, the other annular body is laminated on one annular body and press-fitted into the ground, or the annular body is laminated on the annular body press-fitted into the ground. To build urban underground structures that reach the depth of
The steel segment is a casing formed by welding a pair of main girders and a pair of joint plates to each other to form a frame, and welding a skin plate to the frame. In order to improve accuracy, a device for assembling a steel segment has been disclosed (for example, see Patent Document 1).

Japanese Utility Model Publication No. 56-34854 (page 2-3, Fig. 1)

However, since the idea disclosed in Patent Document 1 is a jig for assembling a steel segment made of a plate material having a simple shape in which the main girder is substantially arc-shaped or linear, the main girder has a missing portion. In some cases, there is a problem that the accuracy cannot be maintained due to welding deformation.
That is, since the longitudinal beam for reinforcing the underground structure is installed inside the underground structure, in the case of a substantially arc-shaped steel segment, the concave side of the main girder (hereinafter referred to as “inner circumferential side”) In the case of a straight steel segment, the missing part for installing the vertical beam is machined in, and the skin plate is welded to the convex side (hereinafter referred to as the “outer side”). The missing part for installing the vertical beam is processed on one side of the girder (hereinafter referred to as “inner side” for convenience of explanation), and the skin is formed on the opposite side (hereinafter referred to as “outer side” for convenience of explanation). The plates are welded together.
Therefore, when the skin plate is welded, the outer peripheral side of the main girder is thermally shrunk by welding heat input, so that an internal stress (same as the bending moment) is generated in the main girder in the direction of expanding its curvature deformation. At this time, since the defect portion is easily deformed because it has a lower bending rigidity than the other portions, the dimensional accuracy of the main girder deteriorates due to plastic deformation concentrated on the defect portion (plastic deformation that refracts).

  The present invention has been made to solve such problems, and is a steel segment (hereinafter referred to as a “segment”) having reinforcing means that functions as a vertical beam without having a defect portion, and It aims at providing the manufacturing method.

(1) Steel segments according to the present invention are joined together to form an annular body, the annular body is press-fitted into the ground, and joined to the annular body that is press-fitted into the ground to form a new annular body. A steel segment that is used for an underground structure formed by press-fitting the new annular body into the ground,
The steel segment is formed by welding and joining a main girder made of a pair of plate members, a joint plate made of a pair of plate members, and a skin plate made of a plate material, and a housing having an opening on the one side. A vertical rib connecting the beams, and a vertical beam member connecting the pair of main beams,
The vertical beam members connect a pair of vertical members facing each other at a predetermined interval, a pair of horizontal members connecting the longitudinal ends of the pair of vertical members, and the pair of horizontal members And the outer peripheral member installed at the outer peripheral end of the pair of vertical members,
The skin plate is cut off in a range in which the outer peripheral member is installed, and a through-hole penetrating the main girder is provided in the transverse member.

(2) The steel segment manufacturing method according to the present invention is formed by joining together to form an annular body, the annular body is press-fitted into the ground, and joined to the annular body press-fitted into the ground. A steel segment for use in an underground structure formed by being formed into an annular body and further formed by press-fitting the new annular body into the ground,
A step of welding a main girder made of a pair of plate materials, a joint plate made of a pair of plate materials, and a skin plate made of a plate material to form a housing having an opening on one side;
One end of the pair of vertical members is connected to one main girder of the pair of main beams, and the other end of the pair of vertical members is connected to the other main beam of the pair of main beams Connecting to
One end of the pair of horizontal members is connected to one vertical member of the pair of vertical members, and the other end of the pair of horizontal members is connected to the other vertical member of the pair of vertical members. Connecting to
Cutting out a range of the skin plate corresponding to a rectangular range formed by the pair of vertical members and the pair of horizontal members;
Characterized by a step of joining the outer peripheral member which is installed at the end on the outer side of the pair of longitudinal members and connecting said pair of horizontal members to each other, the pair of transverse members and the pair of longitudinal members And

(3) The steel segment manufacturing method according to the present invention is formed by joining together to form an annular body, the annular body is press-fitted into the ground, and joined to the annular body press-fitted into the ground. A steel segment for use in an underground structure formed by being formed into an annular body and further formed by press-fitting the new annular body into the ground,
A step of welding a main girder made of a pair of plate materials, a joint plate made of a pair of plate materials, and a skin plate made of a plate material to form a housing having an opening on one side;
One end of the pair of vertical members is connected to one main girder of the pair of main beams, and the other end of the pair of vertical members is connected to the other main beam of the pair of main beams Connecting to
One end of the pair of horizontal members is connected to one vertical member of the pair of vertical members, and the other end of the pair of horizontal members is connected to the other vertical member of the pair of vertical members. Connecting to
Cutting out a range of the skin plate corresponding to a rectangular range formed by the pair of vertical members and the pair of horizontal members;
Characterized by a step of joining the outer peripheral member which is installed at the end on the outer side of the pair of longitudinal members and connecting said pair of horizontal members to each other, the pair of transverse members and the pair of longitudinal members And

  (4) Moreover, the vertical rib which connects a pair of said main girder is installed, It is characterized by the above-mentioned.

The steel segment according to the present invention has a casing-like vertical beam member composed of a pair of vertical members, a pair of horizontal members, and an outer peripheral member, and connecting bolts are provided in through holes provided in the horizontal members. The vertical beam member of one steel segment and the vertical beam member of the other steel segment can be firmly connected to each other so that the connected vertical beam member is connected to the one steel segment. And the same effect as a separate vertical beam locked to the other steel segment.
Therefore, since it becomes unnecessary to provide the steel segment with a missing portion for installing the vertical beam, the manufacturing is facilitated and the manufacturing accuracy is improved. In addition, when constructing underground structures by laminating an annular body having the steel segments, it is not necessary to install vertical beams (welding work, etc.), so the process is simple and quick, and the construction period is shortened. The reliability of underground structures is improved.

  In the method for manufacturing a steel segment according to the present invention, a skin plate is installed on the entire outer surface, and then a pair of vertical members and a pair of horizontal members are installed. Can be installed, the installation work is easy and the installation accuracy is improved. Further, after installing the vertical member and the horizontal member, the outer peripheral member is placed on the outer peripheral side inside the rectangular frame surrounded by the vertical member and the horizontal member in order to cut out a predetermined range of the skin plate and install the outer peripheral member. Therefore, the installation work is easy and the installation accuracy is improved.

  Further, in the method for manufacturing a steel segment according to the present invention, the skin plate is installed on the entire outer peripheral side, the vertical member and the horizontal member are installed, and then the predetermined range of the skin plate is cut off to obtain the vertical member and the main member. Since the outer peripheral member can be easily inserted from the outer peripheral side into the rectangular frame surrounded by the girders, the end surface on the inner peripheral side of the outer peripheral member can be brought into contact with the outer peripheral end of the lateral member. Installation work of members is easy and installation accuracy is improved.

  Furthermore, since it has the process of installing a vertical rib, the intensity | strength and rigidity of steel segments can be ensured.

[Embodiment 1]
1 is a perspective view schematically showing a steel segment according to Embodiment 1 of the present invention, FIG. 2A is a partially enlarged perspective view seen from the inner peripheral side, and FIG. 2A is an outer periphery. It is the one part expansion perspective view seen from the side.
In FIG. 1, a steel segment 100 (hereinafter referred to as “segment”) welds and joins a main girder 1a, 1b made of a pair of plate materials, a joint plate 2a, 2b made of a pair of plate materials, and a skin plate 4 made of a plate material. A casing having an opening (hereinafter referred to as “outer peripheral side”) formed on one side, vertical ribs 3a, 3b, 3c connecting the main beam 1a and the main beam 1b, and a vertical beam member 5; Have
The vertical beam member 5 includes a pair of vertical members 52a and 52b that connect the main beam 1a and the main beam 1b, a horizontal member 51a that is connected to the vertical members 52a and 52b, and is installed in the main beam 1a. A lateral member 51b connected to the members 52a and 52b and installed on the main beam 1b, and an outer periphery installed so as to substantially close the outer peripheral side of the frame formed by the lateral members 51a and 51b and the vertical members 52a and 52b. Member 54.

In FIG. 2B, the lateral member 51a overlaps the main beam 1a, and the outer peripheral surface thereof is connected to the inner peripheral surface of the skin plate 4 substantially smoothly. In this state, with the skin plate 4 installed, the outer peripheral surface of the horizontal member 51a is brought into contact with the inner peripheral surface of the skin plate 4, and the horizontal member 51a is welded to the vertical members 52a and 52b. 52a, Ru Oh in order to remove the skin plate 4 ranges flanked by 52 b (which will be described separately in detail).
The outer peripheral member 54 is inserted into the frame member formed by the horizontal members 51a and 51b and the vertical members 52a and 52b, and the curvature radius of the outer peripheral surface of the outer peripheral member 54 and the curvature radius of the outer peripheral surface of the skin plate 4 are Are the same, and both outer peripheral surfaces are connected smoothly.

At this time, since the plate thickness of each member constituting the vertical beam member 5 is a desired thickness and has a desired strength and rigidity, the segment 100 maintains a predetermined shape accuracy and also has a vertical beam member. 5 Accordingly reinforcement will be stiffened.
It should be noted that the plate thickness and shape of each member shown in the figure are examples schematically shown, and are exaggerated for easy understanding, and the magnitude relationship between them is not limited to that shown in the figure. Further, the shape and size of the welding groove are not limited to those illustrated in the same manner.

  FIG. 3 is a schematic diagram for explaining the underground structure having the segments shown in FIGS. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted. In FIG. 3, the underground structure 200 includes a segment 100 and other segments (according to the segment 100 not including the vertical beam member 5) joined to each other with bolts (inserted into the through holes 21a and 21b, not shown). The annular bodies 101, 102, 103, and 104 formed by connecting with each other are stacked.

That is, the vertical beam members 5 of the segments 100 constituting the annular bodies 101, 102, 103, 104 are laminated so as to have the same phase, and a joining bolt (not shown) is inserted into each of the through holes 55a, 55b. As a result, the respective lateral members 51a and 51b are connected. Similarly, joint bolts (not shown) are inserted into the respective through holes 11a and 11b, thereby connecting the main girders 1a and 1b.
Therefore, since the vertical beam members 5 of the segments 100 constituting the annular bodies 101, 102, 103, 104 behave as if they are integrated, the laminated annular bodies 101, 102, 103, 104 are stacked. The underground structure 200 having the above is reinforced and stiffened by the connected vertical beam member 5.

Therefore, since the underground structure 200 has a predetermined strength and rigidity without separately installing a longitudinal beam for reinforcement or stiffening across the annular bodies 101, 102, 103, 104, the construction can be simplified. And speeding up.
Since the position of the vertical beam member 5 of the segment 100 constituting the annular bodies 101 and 103 is different from the position of the vertical beam member 5 of the segment 100 constituting the annular bodies 102 and 104, the annular body 101 103, the joint plates 2a, 2b of the segment 100 and the joint plates 2a, 2b of the segment 100 of the annular bodies 102, 104 are arranged in different phases.

FIG. 4 is a perspective view schematically showing another example of the steel segment according to Embodiment 1 of the present invention. In FIG. 4, a steel segment 300 (hereinafter referred to as “segment”) is the same as the segment 100 in the perspective view seen from the inner peripheral side, but the perspective view seen from the outer peripheral side is different. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted.
That is, in the segment 300, the outer peripheral member 54 is inserted into the frame formed by the main girders 1a and 1b and the vertical members 52a and 52b, and the inner peripheral surface of the outer peripheral member 54 contacts the outer peripheral surface of the horizontal member 51a. Touching. That is, in a state where the skin plate 4 is installed, a gap substantially equal to the plate thickness of the outer peripheral member 54 is provided between the outer peripheral surface of the horizontal member 51a and the inner peripheral surface of the skin plate 4, so that the horizontal member 51a is a vertical member. 52a and 52b are welded (this will be described in detail separately).
Therefore, the segment 300 is reinforced or stiffened by the longitudinal beam member 5 in the same manner as the segment 100 described above, and the underground structure including the segment 300 has a predetermined strength and rigidity similar to the underground structure 200 described above. Will have.

[Embodiment 2]
5, 6, and 7 are a flow chart of a method for manufacturing a steel segment according to Embodiment 2 of the present invention, and a partial perspective view illustrating the same. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted.

  First, the main girders 1a and 1b made of a pair of plate materials, the joint plates 2a and 2b made of a pair of plate materials, and the skin plate 4 made of a plate material are welded and joined, and one (outer peripheral side) has an opening. A housing is formed (step 1).

  Therefore, both ends of a pair of vertical members 52a and 52b that connect the main beam 1a and the main beam 1b and confront each other with a predetermined interval are provided on the main beams 1a and 1b, respectively. At this time, since the end surfaces on the outer peripheral side of the vertical members 52a and 52b are in contact with the skin plate 4, the skin plate 4 serves as a reference surface, so that the main girders 1a and 1b can be easily installed and the installation accuracy is improved. Maintained (step 2).

  And a pair of horizontal member 51a, 51b which connects the edge parts of the vertical direction of the vertical members 52a, 52b is installed in the vertical members 52a, 52b. At this time, the lateral members 51a and 51b can be placed on the main girders 1a and 1b, respectively, and the outer peripheral side end surfaces of the lateral members 51a and 51b can be brought into contact with the skin plate 4. Since it plays a role, the installation of the lateral members 51a and 51b is facilitated and the installation accuracy is maintained (step 3, see FIG. 6).

  Therefore, the range of the skin plate 4 corresponding to the rectangular frame formed by the horizontal members 51a and 51b and the vertical members 52a and 52b is cut out (see step 4 and FIG. 7).

  Then, the outer peripheral member 54 that connects the horizontal members 51a and 51b is inserted into the frame formed by the horizontal members 51a and 51b and the vertical members 52a and 52b, and the periphery of the outer peripheral member 54 is surrounded by the horizontal members 51a and 51b. The segment 100 is formed by welding and joining to the vertical members 52a and 52b (step 5, see FIG. 2).

In step 1, vertical ribs 3a, 3b, and 3c for connecting the main beam 1a and the main beam 1b are provided. Therefore, the vertical beam member 5 which is a casing formed by the horizontal members 51a and 51b, the vertical members 52a and 52b, and the outer peripheral member 54 is easily formed with high dimensional accuracy.
In step 3, the transverse members 51a and 51b may be welded to the main girders 1a and 1b. Moreover, you may process the scallop of a predetermined | prescribed magnitude | size and a predetermined shape in the corner | angular part of each horizontal part. Furthermore, the welded joints of each part may be temporarily welded after temporary welding and then main welded without temporary welding. The presence or absence of a weld groove, the shape when a weld groove is provided, The size is not limited.

FIG. 8: is a fragmentary perspective view explaining the other example of the manufacturing method of the steel segment which concerns on Embodiment 2 of this invention. That is, the manufacturing method of the segment 300 (see FIG. 4) will be described, and the flowchart is the same as that of the segment 100 (see FIG. 5).
In step 3 in the method for manufacturing the segment 300, a gap obtained by subtracting the thickness of the skin plate 4 from the thickness of the outer peripheral member 54 between the outer peripheral surface of the lateral member 51a and the inner peripheral surface of the skin plate 4 (FIG. 8). The horizontal member 51a is welded to the vertical members 52a and 52b. This is because the outer peripheral surface of the skin plate 4 and the outer peripheral surface of the outer peripheral member 54 are flush with each other (substantially continuous surface).

For this reason, when the predetermined range of the skin plate 4 is removed in step 4, a staircase whose both sides are sandwiched between the vertical members 52a and 52b appears on the outer periphery of the horizontal member 51a (see FIG. 8, the same applies to the horizontal member 51b). .
In step 5, the end of the outer peripheral member 54 is brought into contact with the gap (indicated by the double diagonal lines in FIG. 8), and the periphery of the outer peripheral member 54 is welded to the horizontal member 51a and the vertical members 52a and 52b. (See FIG. 4). At this time, the longitudinal end of the outer peripheral member 54 and the main girders 1a and 1b may be welded.

  The present invention is widely used as a method for manufacturing a steel segment to be used for an underground structure, in particular, as a steel segment having a vertical beam member capable of obtaining the same operational effects as when a vertical beam is installed, and a method for manufacturing the same. Can be used.

The perspective view which shows typically the steel segment which concerns on Embodiment 1 of this invention. The expansion perspective view which shows typically the steel segment which concerns on Embodiment 1 of this invention. The schematic diagram explaining the underground structure which has the steel segments shown in FIG. The perspective view which shows typically the other example of the steel segments which concern on Embodiment 1 of this invention. The flowchart of the manufacturing method of the steel segment which concerns on Embodiment 2 of this invention. FIG. 6 is a partial perspective view illustrating step 3 of the flowchart shown in FIG. 5. FIG. 6 is a partial perspective view illustrating step 4 in the flowchart shown in FIG. 5. The fragmentary perspective view explaining the other example of the manufacturing method of steel segments.

Explanation of symbols

1a main beam 1b main beam 2a joint plate 2b joint plate 3a vertical rib 3b vertical rib 3c vertical rib 4 skin plate 5 vertical beam member 11a through hole 21a through hole 51a horizontal member 51b horizontal member 52a vertical member 52b vertical member 54 outer peripheral member 55a Through hole 55b Through hole 100 Steel segment 101 Annular body 102 Annular body 103 Annular body 104 Annular body 200 Underground structure 300 Steel segment

Claims (4)

Are joined together and formed into an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground to form a new annular body, and further, the new annular body is A steel segment used for underground structures formed by being pressed into the ground,
The steel segment is formed by welding and joining a main girder made of a pair of plate members, a joint plate made of a pair of plate members, and a skin plate made of a plate material, and a housing having an opening on the one side. A vertical rib connecting the beams, and a vertical beam member connecting the pair of main beams,
The vertical beam members connect a pair of vertical members facing each other at a predetermined interval, a pair of horizontal members connecting the longitudinal ends of the pair of vertical members, and the pair of horizontal members And the outer peripheral member installed at the outer peripheral end of the pair of vertical members,
A steel segment, wherein the skin plate is cut off in a range in which the outer peripheral member is installed, and a through-hole penetrating the main girder is provided in the transverse member. Are joined together and formed into an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground to form a new annular body, and further, the new annular body is A method of manufacturing a steel segment to be used for an underground structure formed by being pressed into the ground,
A step of welding a main girder made of a pair of plate materials, a joint plate made of a pair of plate materials, and a skin plate made of a plate material to form a housing having an opening on one side;
One end of the pair of vertical members is connected to one main girder of the pair of main beams, and the other end of the pair of vertical members is connected to the other main beam of the pair of main beams Connecting to
One end of the pair of horizontal members is connected to one vertical member of the pair of vertical members, and the other end of the pair of horizontal members is connected to the other vertical member of the pair of vertical members. Connecting to
Cutting out a range of the skin plate corresponding to a rectangular range formed by the pair of vertical members and the pair of horizontal members;
Characterized by a step of joining the outer peripheral member which is installed at the end on the outer side of the pair of longitudinal members and connecting said pair of horizontal members to each other, the pair of transverse members and the pair of longitudinal members A method for manufacturing a steel segment. Are joined together and formed into an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground to form a new annular body, and further, the new annular body is A method of manufacturing a steel segment to be used for an underground structure formed by being pressed into the ground,
A step of welding a main girder made of a pair of plate materials, a joint plate made of a pair of plate materials, and a skin plate made of a plate material to form a housing having an opening on one side;
One end of the pair of vertical members is connected to one main girder of the pair of main beams, and the other end of the pair of vertical members is connected to the other main beam of the pair of main beams Connecting to
One end of the pair of horizontal members is connected to one vertical member of the pair of vertical members, and the other end of the pair of horizontal members is connected to the other vertical member of the pair of vertical members. Connecting to
Cutting out a range of the skin plate corresponding to a rectangular range formed by the pair of vertical members and the pair of horizontal members;
Characterized by a step of joining the outer peripheral member which is installed at the end on the outer side of the pair of longitudinal members and connecting said pair of horizontal members to each other, the pair of transverse members and the pair of longitudinal members A method for manufacturing a steel segment.   The method for manufacturing a steel segment according to claim 2 or 3, wherein vertical ribs for connecting the pair of main girders are installed.

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