JP2006068752A - Method for manufacturing steel segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a steel segment, which method can suppress the deformation caused by unevenly input welding heat even when the steel segment having a so-called blade opening is manufactured. <P>SOLUTION: Vertically plane restricting members 50 are temporarily connected to the outside surfaces of joint plates 12a, 12b by welding. Blade opening side plates 22a, 22b are temporarily connected to the vertical plane restricting members 50 by welding. After that, the vertically plane restricting members 50 and the blade opening side plates 22a, 22b are finally connected to an underground side main beam 15 by welding. In addition, after a horizontally restricting members 40 for connecting the joint plates 12a, 12b has been temporarily connected to the joint plates by welding, a peripheral plate 21 outside the blade opening is finally connected to a skin plate 11 and the underground side main beam 15 by welding. Further, after the peripheral plate 21 outside the blade opening has been finally connected to the blade opening side plates 22 by welding in the state that the restricting members 40, 50 are temporarily connected, the blade opening side plates 22 are finally connected to the underground side main beam 15 by welding. Alternatively, after the blade opening side plates 22 have been finally connected to the joint plates 12a, 12b by welding, the peripheral plate 21 outside the blade opening is finally connected to the blade opening side plates 22 by welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a steel segment for manufacturing a steel segment used for an underground structure, in particular, a steel segment having a cutting edge disposed at the lowest stage of an urban underground structure. .

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 And in order to raise the manufacture precision of this steel segment, the device of the jig for the assembly of a steel segment is indicated (for example, refer to patent documents 1).

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

The device disclosed in Patent Document 1 is a jig for assembling a steel segment having a substantially symmetrical shape in the vertical direction and the horizontal direction (corresponding to the vertical direction and horizontal direction in an urban underground structure). Therefore, it is possible to assemble a steel segment having a substantially symmetrical shape with high accuracy.
However, even if a steel segment is assembled with high precision using such a jig, welding is performed when a soil excavation part (hereinafter referred to as “blade edge”) is welded to one of the segments (corresponding to the underground side). There was a problem that the high accuracy could not be maintained due to imbalance of heat input.

  The present invention has been made in order to solve such a problem, and is capable of producing deformation of a steel segment (hereinafter referred to as “segment”) having a blade edge, but with uneven welding heat input. It aims at providing the manufacturing method of the steel segment which can be suppressed to the minimum.

(1) A 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 process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
In the temporary welding state, a step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member; ,
A step of welding the blade edge side plate to the joint plate in the temporary welding state;
And a step of removing the vertical surface restraining member after the welding of the blade edge side plate is completed.

(2) Further, they are joined together to form an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground, and formed into a new annular body, A method for manufacturing a steel segment to be used for an underground structure formed by press-fitting a new annular body into the ground,
A process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
In the temporary welding state, a blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder is formed on an outer peripheral surface of the skin plate and an end portion of the underground main girder near the skin plate. Welding and joining,
And a step of removing the horizontal direction restraining member after the welding connection of the blade plate is completed.

(3) Further, they are joined together to form an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground, and formed into a new annular body, A method for manufacturing a steel segment to be used for an underground structure formed by press-fitting a new annular body into the ground,
A process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
A step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member;
In the temporary welding state, a blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder, an outer peripheral surface of the skin plate, an end portion of the underground main girder near the skin plate, and the A step of welding and joining the edge of the blade edge side plate near the skin plate;
Welding the blade edge side plate to the joint plate;
A step of removing the horizontal direction restraining member and the vertical surface restraining member after the welding connection of the blade edge side plate is completed.

(4) Further, they are joined together to form an annular body, the annular body is press-fitted into the ground, joined to the annular body press-fitted into the ground, and formed into a new annular body. A method for manufacturing a steel segment to be used for an underground structure formed by press-fitting a new annular body into the ground,
A process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
A step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member;
A step of welding the blade edge side plate to the joint plate in the temporary welding state;
A blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder, an end portion near the skin plate of the blade edge side plate, an outer peripheral surface of the skin plate, and a skin plate of the underground main girder A process of welding and joining to a near end,
A step of removing the horizontal direction restraining member and the vertical surface restraining member after the welding joining of the blade edge plate is completed.

  (5) Furthermore, the horizontal direction restraining member is temporarily welded to a position near the underground side main girder of the joint plate at an end of the casing on the opening side.

  (6) Further, the blade plate is welded to the joint plate in the temporary welding state.

  (7) Further, a blade rib for connecting the blade plate and the underground main girder is installed in a state where the vertical surface restraining member is temporarily welded.

(8) Furthermore, in the step of forming the frame, a plurality of vertical ribs connecting the underground main girder and the ground main girder are installed,
In the step of welding and joining the skin plates, a club guide is installed at the end of the plurality of vertical ribs on the opening side.

The method for manufacturing a steel segment according to the present invention has the following effects.
(I) a step of temporarily welding the vertical surface constraining member to the joint plate, a step of temporarily welding the blade edge side plate to the vertical surface constraining member in the temporary welding state, and the ground side main plate in the temporary welding state. Since the cutting edge plate is restrained by the vertical surface restraining member, the deformation of the cutting edge side plate due to welding heat input is minimized (the degree of perpendicularity to the underground main girder is guaranteed). The same).

  (Ii) a step of temporarily welding the horizontal direction restraining member to each of the pair of joint plates, and a step of welding the blade plate to the outer peripheral surface of the skin plate and the underground main girder in the temporary welding state; Since the underground main girder is constrained by the horizontal direction restraining member, deformation of the casing (twist, variation in curvature of the underground main girder in plan view, etc.) due to welding heat input can be minimized. . That is, in the case of an arc-shaped steel segment in plan view, even if a tensile force due to welding heat input acts on the outer peripheral side, an increase (opening deformation) of the radius of curvature of the arc constrained on the inner peripheral side is prevented, In the case of a steel segment having a rectangular shape in plan view, even if a tensile force due to welding heat input acts on one side, the linearity restrained on the other side is lost, and deformation such that one side becomes a recess is prevented. .

  (Iii) Also, with the horizontal direction restraining member and the vertical surface restraining member temporarily welded, the blade edge plate is first welded and joined to the skin plate, the underground main girder, and the blade edge side plate. In addition, since the blade edge side plate (welded to the blade edge plate) is welded to the underground main girder, deformation of the blade edge side plate (falling with respect to the underground main beam) is further prevented.

  (Iv) In the state where the horizontal direction restraining member and the vertical surface restraining member are temporarily welded, the blade edge side plate is first welded and joined to the joint plate, and then the blade edge plate is joined to the blade edge side plate (joint Since it is welded to the skin plate and the underground main girder), deformation of the blade plate is further prevented.

  (V) Furthermore, the horizontal direction restraint member is close to the underground main girder at the end portion on the opening side of the housing (same as the end portion where the skin plate is not welded), that is, the welding heat input Since temporary welding is performed on the larger side, deformation of the underground main girder due to welding heat input is effectively prevented.

  (Vi) Further, in the temporary welding state, the blade edge plate is also welded to the joint plate, that is, the three sides are welded, so that the integration of the segments is further strengthened.

(Vii) Further, since the blade edge ribs are installed, the rigidity of the blade edge plate is increased and the workability is improved.
(Viii) Further, since the vertical rib and the club guide are installed, the rigidity of the segment is increased and the workability is improved. In particular, when constructing the underground structure, the workability is improved because the club which is the earth and sand excavating means is suitably guided by the club guide.

  Hereinafter, an embodiment will be described based on a flowchart and a schematic perspective view. Note that each step is denoted as “S”, and a part of the description of the same or corresponding contents in the following drawings is omitted. Also, in the following figures, according to the posture of the steel segment in the completed underground structure, the underground direction is “down” and the ground direction is “up”, and the outside of the underground structure (contacts or confronts the ground). The direction that becomes the outer side, the inner side of the underground structure (inside the inner space), and the horizontal direction along the underground structure are called the outer side or inner side. is doing. In addition, the welding joint finally left is called "main welding", and the welding joint removed in the middle is called "temporary welding", and the two are distinguished.

[Embodiment 1]
1 and 2 are a flow diagram and a schematic perspective view for explaining a method for manufacturing a steel segment according to Embodiment 1 of the present invention.

  First, the ground-side main girder 15 and the ground-side main girder 16 that face each other, the pair of joint plates 12a and 12b that face each other, and the skin plate 11 made of a plate material are welded to each other, and an opening (on the outer circumferential surface) is formed on one side. The same) is formed. That is, the periphery of the skin plate 11 is finally welded to the end portions near the outer periphery of the underground main girder 15, the ground main girder 16, and the joint plates 12a and 12b. Further, vertical ribs 13a, 13b, and 13c that connect the underground main girder 15 and the ground main girder 16 are provided. Note that the surfaces of the joint plates 12a and 12b that face each other are referred to as “inner side surfaces”, and the surface opposite to the inner side surface is referred to as “outer side surface” (1 in S1).

  Next, the vertical surface restraining members 50a and 50b projecting downward along the outer surfaces of the joint plates 12a and 12b are temporarily welded to the outer surfaces of the joint plates 12a (2 of S1).

  In this temporary welding state, the substantially triangular blade edge side plates 22a and 22b (projecting downward along the outer surfaces of the joint plates 12a and 12b) are temporarily welded to the vertical surface restraining members 50a and 50b (3 in S1). ).

  Therefore, the upper ends of the blade edge side plates 22a and 22b are finally welded to the lower ends of the joint plates 12a and 12b, respectively. At this time, since one side groove is provided on the inner side surface of the upper end portion of the blade edge side plates 22a and 22b and the weld bead is formed on the inner side surface, the weld bead does not rise on the outer side surface (4 in S1, FIG. 2). (See (a)).

  Furthermore, the blade edge plate 21 (which is parallel to the skin plate 11 and protrudes downward. In order to avoid confusion with the blade edge inner peripheral plate 24 described later, the skin plate 11 is referred to as “the blade edge outer peripheral plate 21”) is a housing. 10 is installed. That is, the upper end portion of the blade outer peripheral plate 21 and the outer peripheral surface of the skin plate 11 are connected to the inner peripheral surface of the blade outer peripheral plate 21 and the outer periphery of the lower surface of the underground main girder 15. On the inner peripheral surface, both side portions and the end portions near the outer periphery of the blade edge side plates 22a, 22b are each subjected to main welding (5 in S1).

  Further, a club guide 14 which is a plate material is installed on the inner periphery of the housing 10. That is, the periphery of the club guide 14 is finally welded to the end portions on the inner peripheral side of the vertical ribs 13a and 13c and the underground main girder 15 (S1-6).

  Moreover, the blade edge ribs 23a, 23b, and 23c are installed. That is, the outer portions of the blade edge ribs 23a, 23b, and 23c are main-welded to the inner peripheral surface of the blade edge outer peripheral plate 21, and the upper end portion is main-welded to the lower surface of the underground main girder 15 (S1-7).

Then, a blade edge inner peripheral plate 24, which is a plate material, is installed, and the cross section formed by the blade edge outer peripheral plate 21, the blade edge side plates 22a, 22b, the blade edge ribs 23a, 23b, 23c, and the blade edge inner peripheral plate 24 is substantially perpendicular. A “blade 20” which is a triangular box is formed.
That is, the periphery of the blade inner peripheral plate 24 is located at a position close to the lower end on the inner peripheral surface of the blade outer peripheral plate 21, end portions on the inner peripheral side of the blade edge side plates 22 a and 22 b, and the lower surface of the underground main girder 15. Main welding is performed at a position close to the end portion on the inner peripheral side (refer to 8 of S1, FIG. 2B).

  And after the said main welding is complete | finished, the said temporary welding part is excised, the vertical surface restraint members 50a and 50b are removed, and the segment 30 is formed (9 of S1).

Accordingly, the blade edge side plates 22a and 22b are provisionally welded to the vertical surface restraining members 50a and 50b and are finally welded in a state of being restrained thereby, so that the falling deformation is suppressed.
In particular, in order to prevent the weld bead from rising on the outer surface of the abutting portion between the blade edge side plates 22a and 22b and the joint plates 12a and 12b, a one-side groove is provided inside the upper end portion of the blade edge side plates 22a and 22b. Butt welding from inside.

  For this reason, when the vertical surface restraining members 50a and 50b are not provided, the blade edge side plates 22a and 22b tend to be deformed so as to fall inward (in a direction approaching as they become lower). Thus, the falling deformation is effectively prevented. Therefore, the outer surfaces of the joint plates 12a and 12b after the main welding and the outer surfaces of the blade edge side plates 22a and 22b form substantially the same surface, and are prevented from being refracted into a square shape. Note that the shape and size of the vertical surface restraining members 50a and 50b and the form of provisional welding are not limited, and are design matters that can be selected as appropriate.

Furthermore, since the blade outer peripheral plate 21 is main-welded to the blade edge side plates 22a and 22b (which are constrained by the vertical surface restraining members 50a and 50b) which have already been welded, the blade edge 20 is formed with high accuracy. Will be.
Therefore, when the joint plate 12a of one segment 30 (the one formed by the housing 10 and the blade opening 20 is referred to as "segment 30") and the joint plate 12b of the other segment 30 are brought into contact with each other. The blade edge side plate 22a of one segment 30 and the blade edge side plate 22b of the other segment 30 come into contact with each other without generating a gap.

The order in which the steps are executed is not limited to the above, and the order can be changed as long as the main welding is performed in a state where the vertical surface restraining members 50a and 50b are temporarily welded.
Further, the through holes 17a and 17b provided in the joint plates 12a and 12b are for inserting connecting bolts when connecting the segments 30 in the side surface direction. Further, the through hole 18 provided in the ground side main beam 16 is used to insert a connecting bolt when the casing 10 (corresponding to a segment not provided with the blade opening 20) is placed and connected to the segment 30. belongs to.
The number and shape of the vertical ribs 13a and the blade edge ribs 23a, the installation form (size, range to be left as openings) of the club guide 14, the number and positions of the through holes 17a, 17b, 18 and the blade edge side plate 22a The presence / absence, shape, etc. of scallops (not shown) provided in the above are design matters that can be appropriately selected.

[Embodiment 2]
3 and 4 are a flow diagram and a schematic perspective view for explaining a method for manufacturing a steel segment according to Embodiment 2 of the present invention.

  First, the underground main girder 15, the ground main girder 16, the joint plates 12a and 12b, and the skin plate 11 are welded to form the housing 10 (the same as 1 in S2 and 1 in S1 described above). .

  Next, a horizontal direction restraining member 40 for connecting the joint plate 12 a and the joint plate 12 b is installed on the inner periphery of the housing 10. That is, one end of the horizontal direction restraining member 40 is located at the inner peripheral side end of the joint plate 12a at a position close to the underground main girder 15, and the other end of the horizontal direction restraint member 40 is located on the inner peripheral side of the joint plate 12b. Are temporarily welded to the positions close to the underground main girder 15 at the end of (2 of S2).

  And the blade edge | tip outer periphery plate 21 is installed in the housing | casing 10 in this temporary welding state. That is, the upper end of the blade outer peripheral plate 21 and the outer peripheral surface of the skin plate 11, the inner peripheral surface of the blade outer peripheral plate 21, and the end near the outer periphery of the lower surface of the underground main girder 15 are each subjected to main welding. . At this time, the inner peripheral surface of the blade outer peripheral plate 21 and the end portions near the outer periphery at the lower ends of the joint plates 12a and 12b may be respectively main-welded (see S2-3, FIG. 4A).

  Further, blade edge side plates 22a and 22b are installed. That is, the upper ends of the blade edge side plates 22a and 22b are finally welded to the lower ends of the joint plates 12a and 12b, and the end portions near the outer periphery thereof are respectively main welded to the blade outer periphery plate 21 (S2-4).

  The club guide 14 is installed on the inner periphery of the housing 10 (S2-5).

  Further, the end portions of the cutting edge ribs 23a, 23b, 23c, which are right-angled triangular plates, near the outer periphery are subjected to main welding on the inner peripheral surface of the cutting edge outer peripheral plate 21 and the upper end portion is connected to the lower surface of the underground main girder 15, respectively. (Refer to S2-6, FIG. 4B).

  Then, the blade edge inner peripheral plate 24 is installed to form the blade edge 20, that is, the periphery of the blade edge inner peripheral plate 24 is positioned near the lower end on the inner peripheral surface of the blade edge outer peripheral plate 21, the blade edge side plates 22a and 22b. The main welding is performed at a position close to the inner periphery at the inner peripheral end and the lower surface of the underground main girder 15 (S2-7).

  And after the said main welding is complete | finished, the said temporary welding part is excised and the horizontal direction restraint member 40 is removed, and the segment 30 is formed (8 of S2).

Therefore, since each member constituting the blade edge 10 is subjected to main welding in a state where the housing 10 is restrained by the horizontal restraining member 40, deformation of the housing 10 due to welding heat input is suppressed, and shape accuracy is good. Segment 30 is obtained.
In particular, if there is no restraint by the horizontal direction restraint member 40, the welding heat input when the main welding of the blade edge outer peripheral plate 21 flows mainly into the outer periphery of the underground main girder 15; When it is arcuate (the ground side main girder 16 is also arcuate), it is deformed in a direction in which the radius of curvature increases (same as the direction of diameter expansion) due to heat shrinkage caused by welding heat input to the outer peripheral side When the middle main girder 15 is linear (the ground side main girder 16 is also linear), the linearity is hindered by heat shrinkage caused by welding heat input to the outer peripheral side, and the outer peripheral side is warped so as to be concave. Try to transform.

For this reason, the skin plate 11 and the joint plates 12a and 12b that are initially perpendicular to the underground main girder 15 and the ground side main girder 16 are inclined with respect to the horizontal plane due to the deformation. When interconnected to form an annular body, the contact between the joint plates 12a and 12b, the flatness of the formed annular body, and the perpendicularity of the blade outer peripheral plate to the ground-side main girder 16 deteriorate. I was supposed to.
The order in which the steps are executed is not limited to the above, and can be changed as long as the main-direction welding is performed in a state where the horizontal direction restraining member 40 is temporarily welded.

[Embodiment 3]
5 and 6 are a flow diagram and a schematic perspective view for explaining a method for manufacturing a steel segment according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to this same part as Embodiment 1 (FIG. 2), and one part description is abbreviate | omitted.

  First, the underground main girder 15, the ground main girder 16, the joint plates 12a and 12b, and the skin plate 11 are welded together to form the housing 10 (the same as 1 in S3 and 1 in S1 described above). .

  Next, one end of the horizontal direction restraining member 40 is positioned at the end on the inner peripheral side of the joint plate 12a close to the underground main girder 15, and the other end of the horizontal direction restraining member 40 is the inner periphery of the joint plate 12b. Temporary welding is performed at positions close to the underground main girder 15 at the end on the side (2 of S3).

  Next, the vertical surface restraining members 50a and 50b are temporarily welded to the outer surfaces of the joint plates 12a and 12b, respectively (S3-3).

  In this temporary welding state, the blade edge side plates 22a and 22b are temporarily welded to the vertical surface restraining members 50a and 50b (see S3-4, FIG. 6A).

  Therefore, the blade outer peripheral plate 21 is installed in this temporary welding state. That is, the upper end of the blade outer peripheral plate 21 is main-welded to the outer peripheral surface of the skin plate 11 (indicated by W1 in FIG. 6B), and the position close to the upper end on the inner peripheral surface is the underground main girder. 15 is welded to the end near the outer periphery on the lower surface of 15 and both sides of the inner peripheral surface are welded to the end near the outer periphery of the blade edge side plates 22a, 22b (indicated by W2 in FIG. 6B) (S3). 5).

  Then, the upper ends of the blade edge side plates 22a and 22b (mainly welded to the blade outer peripheral plate 21) are finally welded to the lower ends of the joint plates 12a and 12b, respectively (W3 in FIG. 6C). Shown in S3 6).

  In addition, the club guide 14 is installed on the inner periphery of the housing 10 (S3-7).

  Further, the main ends of the blade edge ribs 23a, 23b, and 23c near the outer periphery are finally welded to the inner peripheral surface of the blade edge outer peripheral plate 21, and the upper end portion is finally welded to the lower surface of the underground main girder 15 (S3-8).

  The periphery of the blade edge inner peripheral plate 24 is located at a position close to the lower end on the inner peripheral surface of the blade edge outer peripheral plate 21, end portions on the inner periphery side of the blade edge side plates 22 a and 22 b, and the lower surface of the underground main girder 15. The main welding is performed at a position close to the inner periphery (9 of S3).

  And after the said main welding is complete | finished, the said temporary welding part is excised, the horizontal direction restraint member 40 and the vertical surface restraint member 50 are removed, and the segment 30 is formed (10 of S3).

Therefore, since the segment 30 is formed in a state where the housing 10 is restrained by the horizontal restraining member 40 and the blade edge side plate 22 is restrained by the vertical surface restraining member 50, good shape accuracy is guaranteed. It will be.
In particular, in addition to the effects in the first and second embodiments described above, the blade edge side plates 22a and 22b are constrained by the vertical surface restraining member 50. 10 is finally welded W2 to the lower end of the joint plates 12a and 12b (which constitute the housing 10) (S3-6). Therefore, the tip side deformation of the blade edge side plates 22a and 22b is further prevented.

The order in which the steps are executed is not limited to the above, and can be changed as long as the main direction welding is performed in a state where the horizontal direction restraining member 40 and the vertical surface restraining members 50a and 50b are temporarily welded.
Further, the order of the main welding (W1) and the main welding (W2) is not limited to the above, and the main welding (W2) may be performed prior to the main welding (W1). That is, the blade edge side plate 22 is pre-welded (W2) to the blade edge peripheral plate 21 in advance, and then the blade edge peripheral plate 21 to which the blade edge side plate 22 is joined is finally welded (W1) to the skin plate 11. May be.

[Embodiment 4]
7 and 8 are a flow diagram and a schematic perspective view for explaining a method for manufacturing a steel segment according to Embodiment 4 of the present invention.

  First, the underground main girder 15, the ground main girder 16, the joint plates 12a and 12b, and the skin plate 11 are welded to form the housing 10 (the same as 1 in S4 and 1 in S1 described above). .

  Next, one end of the horizontal direction restraining member 40 is positioned at the end on the inner peripheral side of the joint plate 12a close to the underground main girder 15, and the other end of the horizontal direction restraining member 40 is the inner periphery of the joint plate 12b. Temporary welding is performed at positions close to the underground main girder 15 at the end portion (S4-2).

  Next, the vertical surface restraining members 50a and 50b are each temporarily welded to the outer surface of the joint plate 12a (S3-3).

  In this temporary welding state, the blade edge side plates 22a and 22b are temporarily welded to the vertical surface restraining members 50a and 50b (4 in S4).

  Therefore, in this temporary welding state, the upper ends of the blade edge side plates 22a and 22b are finally welded to the lower ends of the joint plates 12a and 12b, respectively (indicated by W4 in FIG. 8A, 5 of S4).

  Further, both side portions of the outer peripheral plate 21 are finally welded to end portions near the outer periphery of the blade side plates 22a and 22b (indicated by W5 in FIG. 8B, 6 in S4).

  Then, the upper end of the blade outer peripheral plate 21 is welded to the outer peripheral surface of the skin plate 11, and the position close to the upper end of the inner peripheral surface is finally welded to the end near the outer periphery of the lower surface of the underground main girder 15. In FIG.8 (b), it shows by W6.7 of S4.

  Further, the club guide 14 is installed on the inner periphery of the housing 10 (S4-8).

  Further, the end portions near the outer periphery of the blade edge ribs 23a, 23b, and 23c are finally welded to the inner peripheral surface of the blade edge outer peripheral plate 21, and the upper end portion is finally welded to the lower surface of the underground main girder 15 (9 in S4).

  The inner periphery of the blade edge inner peripheral plate 24 is located at the inner peripheral surface of the blade edge outer peripheral plate 21 at a position close to the lower end, the inner edge of the blade edge side plates 22a and 22b, and the lower surface of the underground main girder 15. Main welding is performed at positions close to the circumference (10 of S4).

  And after the said main welding is complete | finished, the said temporary welding part is excised, the horizontal direction restraint member 40 and the vertical surface restraint members 50a and 50b are removed, and the segment 30 is formed (11 of S4).

Therefore, since the segment 30 is formed in a state where the housing 10 is restrained by the horizontal restraining member 40 and the blade edge side plate 22 is restrained by the vertical surface restraining member 50, good shape accuracy is guaranteed. It will be.
In particular, in addition to the effects in the first and second embodiments described above, first welding W5 is first performed on both sides of the blade outer peripheral plate 21 on the blade edge side plates 22a and 22b that have already been subjected to the main welding W4 on the housing 10. After S4-6), since the main welding W6 is performed on the upper end portion and the inner peripheral surface of the blade edge outer peripheral plate 21 (S4-7), the blade edge outer peripheral plate 21 is further prevented from falling and deformed. An assembly jig (not shown) for the main welding of the outer peripheral plate 21 is unnecessary or simplified.

  The order of the main welding (W5) and the main welding (W6) is not limited to the above, and the main welding (W6) may be performed prior to the main welding (W5). That is, after the blade outer peripheral plate 21 is subjected to main welding (W6) to the skin plate 11, the blade outer peripheral plate 21 joined to the skin plate 11 is subjected to main welding to the blade edge side plates 22a and 22b (already to the joint plates 12a and 12b). Main welding (W5) may be performed.

  INDUSTRIAL APPLICABILITY The present invention can be widely used as a method for manufacturing a steel segment used for an underground structure, particularly as a method for manufacturing a steel segment that receives uneven welding heat input.

The flowchart explaining the manufacturing method of the steel segments which concern on Embodiment 1 of this invention. The schematic perspective view explaining the manufacturing method of the steel segment which concerns on Embodiment 1 of this invention. The flowchart explaining the manufacturing method of the steel segments which concern on Embodiment 2 of this invention. The schematic perspective view explaining the manufacturing method of the steel segments which concern on Embodiment 2 of this invention. The flowchart explaining the manufacturing method of the steel segments which concern on Embodiment 3 of this invention. The schematic perspective view explaining the manufacturing method of the steel segments which concern on Embodiment 3 of this invention. The flowchart explaining the manufacturing method of the steel segments which concern on Embodiment 4 of this invention. The schematic perspective view explaining the manufacturing method of the steel segments which concern on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing | casing 11 Skin plate 12a Joint plate 12b Joint plate 13a Vertical rib 13b Vertical rib 13c Vertical rib 14 Club guide 15 Underground side main beam 16 Ground side main beam 17a Through hole 17b Through hole 18 Through hole 20 Cutting edge 21 Cutting edge Peripheral plate 22a Blade edge side plate 22b Blade edge side plate 23a Blade edge rib 23b Blade edge rib 23c Blade edge rib 24 Blade edge inner peripheral plate 30 Segment 40 Horizontal direction restraint member 50a Vertical surface restraint member 50b Vertical surface restraint member

Claims (8)

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 process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
In the temporary welding state, a step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member; ,
A step of welding the blade edge side plate to the joint plate in the temporary welding state;
And a step of removing the vertical surface restraining member after the welding of the blade edge side plate is completed. 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 process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
In the temporary welding state, a blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder is formed on an outer peripheral surface of the skin plate and an end portion of the underground main girder near the skin plate. Welding and joining,
And a step of removing the horizontal restraint member after the welding connection of the blade edge plate is completed. 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 process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
A step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member;
In the temporary welding state, a blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder, an outer peripheral surface of the skin plate, an end portion of the underground main girder near the skin plate, and the A step of welding and joining the edge of the blade edge side plate near the skin plate;
Welding the blade edge side plate to the joint plate;
And a step of removing the horizontal direction restraining member and the vertical surface restraining member after the welding connection of the blade edge side plate is completed. 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 process of forming a housing having an opening on one side by welding and joining the opposed underground main girder and ground-side main girder, a pair of opposing coupling plates, and a skin plate made of a plate material;
A step of temporarily welding a horizontal direction restraining member for connecting the pair of joint plates to each of the pair of joint plates;
A step of temporarily welding a vertical surface restraining member projecting in the direction of the underground main girder along the outer surface of the joint plate to each outer surface of the pair of joint plates;
A step of temporarily welding a blade edge side plate that protrudes in the direction of the underground main girder along the outer surface of the joint plate and is welded to the joint plate to the vertical surface restraining member;
A step of welding the blade edge side plate to the joint plate in the temporary welding state;
A blade plate that is parallel to the skin plate and protrudes in the direction of the underground main girder, an end portion near the skin plate of the blade edge side plate, an outer peripheral surface of the skin plate, and a skin plate of the underground main girder A process of welding and joining to a near end,
And a step of removing the horizontal direction restraining member and the vertical surface restraining member after the welding joining of the blade edge plate is completed.   The horizontal direction restraining member is temporarily welded to a position near the underground main girder of the joint plate at an end of the casing on the opening side. The manufacturing method of the steel segment as described.   6. The method for manufacturing a steel segment according to claim 2, wherein the blade edge plate is welded to the joint plate in the temporary welding state.   7. A blade rib for connecting the blade plate and the underground main girder is installed in a state where the vertical surface restraining member is temporarily welded. The manufacturing method of the steel segment as described in 2. In the step of forming the frame, a plurality of vertical ribs connecting the underground main girder and the ground main girder are installed,
The steel guide according to any one of claims 1 to 7, wherein in the step of welding and joining the skin plates, a club guide is installed at an end portion of the casing of the plurality of vertical ribs on the opening side. Segment manufacturing method.

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