JPH09291795A - Steel segment and its joint structure and joining method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: A force acting in a direction of separating steel segments is evenly distributed and acts on the entire steel segment, and does not partially act only on a joint portion. To do so. SOLUTION: In a steel segment 1, 1 in which an end plate 4 is provided at an end portion of a main girder 2, the openings of the end plates of the first and second steel segments 1 facing each other are inserted. An attachment plate 3 that can be fixed along the main girders 2 and 2a located on the back side thereof
Is provided by inserting the opening 6 of the end plate 4 of the steel segment 1 and the base end of the splicing plate 3 along the main girders 2 and 2a of the steel segment 1. It is fixed to the main girders 2 and 2a by 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a pipe such as a water supply and sewerage system, a subway, a telegraph cable accommodation tunnel, an underpass, a water intake tunnel, a water discharge tunnel or a common ditch is constructed by a shield construction method, a deep foundation pile, The present invention relates to a steel segment provided with a retractable splicing plate, a joint structure thereof, and a joining method used in the construction field such as in the case of constructing a cylindrical structure such as an underground space or a water storage tank.

[0002]

2. Description of the Related Art Conventionally, a friction coupling type joint in which a splicing plate is abutted over main girders of adjacent steel segments and joined by bolts and nuts to secure a large joint joining strength is disclosed in JP-A-2-112521. What is described in Japanese Patent Publication is known.

[0003]

However, in the case of the above-mentioned conventional example, the joint plate orthogonal to the main girder interferes with the splicing plate, and the joint plate is not attached. It is necessary to provide a water stop means in a part and a part for receiving a jack reaction force for propelling the shield machine operating in a direction orthogonal to the main girder. Further, when the splicing plate is lengthened, the vertical ribs orthogonal to the main girder also interfere with the splicing plate, and therefore, when the vertical ribs are removed, it is necessary to separately provide a new portion that receives the jack reaction force.

On the other hand, if a slit is provided at the main girder contact portion of the joint plate or the vertical rib, interference with the splicing plate can be eliminated, and there is no hindrance to the installation of the splicing plate. In the case of vertical ribs, the jack reaction force acting on them for propelling the shield machine becomes an eccentric load on the joint plate and the steel plate in the slit portion of the vertical ribs, so the yield strength to resist this becomes small, It is necessary to increase the thickness of the joint plate and the vertical ribs, which increases the cost and the weight of the steel segment.

Further, if a deep slit is formed in the joint plate, there is a drawback that a space for mounting a sealing material for stopping water cannot be secured. The present invention provides a steel segment, a joint structure thereof, and a joining method that solve the above-mentioned problems.

[0006]

SUMMARY OF THE INVENTION In order to advantageously solve the above-mentioned problems, according to the present invention, in a steel segment in which an end plate is provided at an end of a main girder, opposing first and second steels are used. A splicing plate that can be fixed along the main girder located on the back side through the openings of the end plates of the manufactured segment is provided by inserting the openings of the end plates of the steel segment, and Along the main girder of the steel segment the base end of the splicing plate,
It is characterized in that it is fixed to the main girder by a fixing tool. The steel main segment is provided with an intermediate main girder in parallel with the main girder, and the intermediate main girder is located at the back side through the openings of the end plates of the first and second steel segments facing each other. A splicing plate that can be fixed along the girder is provided by inserting through the opening of the end plate of the steel segment, and the base end of the splicing plate is arranged along the middle main girder of the steel segment. It is advisable to fix the intermediate main girder with a fixing tool. The fixing member of each splicing plate in the steel segment is detachably provided to the portion to be fastened, and each splicing plate is provided so that it can be pulled out from the end of the steel segment, and the steel segment. It may be configured to be built in and temporarily fixed. Further, the joint structure of the steel plate segment according to the present invention is the joint structure of the first and second steel segments in which an end plate is provided at the end of the main girder, in which the base end side is the first
An opening along a main girder and an intermediate main girder of the steel segment and fixed by fasteners, and the tip side of which is provided in a reinforcing rib at a right angle to the main girder and the intermediate main girder, and A splicing plate that penetrates through the opening formed in the end plate and projects from the end plate is inserted through the opening formed in the end plate of the second steel segment, and the second steel It is characterized in that it is arranged along a main girder or an intermediate main girder of a manufactured segment and is fixed by a fixture. Moreover, the joining method of the steel segment of this invention WHEREIN: The joining method of the 1st and 2nd steel segment which has an end plate in the edge part of a main girder WHEREIN: The said main girder of a 1st steel segment Along the main girder and through the openings of the reinforcing ribs arranged at right angles to the main girder, along with the main girder After pulling out from the opening of the end plate, the base end side of this splicing plate is fixed to the main girder using a fixing tool, and the tip side of this splicing plate is the end plate of the second steel segment. It is characterized in that the main girder is inserted through the opening, the reinforcing rib is arranged at a right angle to the main girder, the reinforcing rib is opened along the main girder, and the main girder is fixed with a fastener.

According to the present invention, the splicing plate projecting from the end plate of one steel segment is inserted into the opening of the end plate of the other steel segment, and fixed to the main girder or intermediate main girder thereof. By fixing with a tool, opposing steel segments can be joined easily and reliably. Moreover, the force acting in the separating direction acting between the steel segments is transmitted to the main girder or the intermediate main girder through the splicing plate, and is not transmitted to the end plate that is the joint between the steel segments, so There is no risk of the plate deforming, and the surface contact between the steel segments can be maintained smoothly.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings. 1 to 10 show a steel segment 1 according to an embodiment of the present invention, in which two intermediate main girders 2a are arranged between a pair of front and rear main girders 2 at substantially equal intervals, and A plurality of bolt insertion holes 8 are provided in parallel with the main girders 2 and at both ends in the longitudinal direction of the main girders in the widthwise central portions of the main girders 2 and 2a at intervals. 8), and the end plates 4 are brought into contact with both ends of each main girder 2, 2a and fixed by welding. A plurality of openings 6 for inserting the splicing plates are formed at the middle and both ends in the width direction of each end plate 4. The contact plate insertion opening 6 at the middle portion in the width direction of the end plate 4 is substantially rectangular, and the ends of the main girders 2 and 2a are located in the middle thereof. 6
Are formed in a groove shape.

The end plate 4 is a continuous portion 4 of the steel plate on the upper side and the lower side of the opening 6 for inserting the splicing plate provided therein.
a or the end arm piece 4b is fixed to the main girders 2 and 2a by welding. Also, the skin plate 16
Is applied to the main girders 2, the end plates 4, the intermediate main girders 2a, and the lower end surfaces of the vertical ribs 9 and fixed by welding.

Between the left and right end plates 4, a plurality of reinforcing ribs (hereinafter referred to as steel vertical ribs) are arranged in parallel with each other at intervals.
9 are arranged at right angles so as to intersect the main girders 2 and 2a, and are divided and arranged at the portions of the main girders 2 and 2a. Further, at the end of each of the steel vertical ribs 9, each main girder 2,
An opening 6 for inserting the splicing plate, which is formed of a groove, at a position facing 2a.
Are provided and are fixed to the main girders 2 and 2a by welding at the upper side and the lower side of the opening 6 of the steel plate arm piece 9a.

In the steel segment 1, a steel splicing plate 3 extends over the spouting plate insertion openings 6 in the ribs 9 in the longitudinal direction of the main girder, and the inner surface of each main girder 2 and , Are arranged along both side surfaces of the intermediate main girder 2a. In order to fix the steel splicing plate 3 to the main girders 2 and 2a of the steel segment 1 along the longitudinal direction of the central portion and through the plate surface by the bolt 10 and the nut 11 screwed thereto. A plurality of through holes 12 for bolt insertion are provided at intervals (in the illustrated case, eight holes are provided on each of the left and right sides of the intermediate portion).

Although the splicing plate 3 may be fixed to the main girders 2 and 2a from the beginning at the position shown by the solid line in FIG. 1, in the example of the present invention, the splicing plate 3 is The splicing plate 3 can be built into the steel segment 1 through the opening 6 by being provided with a size that fits within the length of the steel segment 1 in the longitudinal direction and by removing the bolt 10 and the nut 11. Is configured. In this case, in the steel segment 1, the splicing plate 3 is temporarily fixed to each main girder 2, 2a by one or a plurality of bolts 10 and nuts 11 or by an adhesive tape (not shown) or the like as required. In this way, when the steel segment 1 is transported or assembled, the splicing plate 3 does not shift and project from the steel segment 1, so there is no protrusion from the steel segment 1 when assembling the segment. For,
It is advantageous when rotating, rotating or hoisting or hanging the steel segment 1.

Further, a concave groove 13 is formed in one end of the outer surface of the main girder 2 and the end plate 4 of the steel segment 1 for fitting an annular water-tight packing (not shown). . Although there is an opening 6 in the end plate 4, the continuous portion 4a or the end arm piece 4b is provided above and below the opening 6.
Therefore, there is no problem in continuously forming the groove 13, and as described later, when the steel segment 1 is connected to the front, rear, left, and right, an annular stopper that fits into the groove 13 is formed. Water sealing by water packing is perfect. In addition, the end plate 4 is provided with a plurality of bolt insertion holes 14 for temporary assembly when the plurality of steel segments 1 are connected.

Next, the temporary assembly process of the steel segment will be described. Using the steel segment 1 shown in FIGS. 1 to 3, for example, to construct an inner wall of a tunnel of rectangular cross section,
When temporarily assembling the annular steel segment, it is performed as shown in FIGS. FIG. 5 shows an example in which the steel segment 1 of the present invention is configured as an inner wall of a tunnel 15 having a rectangular cross section, and FIGS. 6 and 7 are views looking down the inner wall of the tunnel 15 described above. The direction of arrow F is the tunnel axis direction, and in FIG.
The side to which the main girders 2 and 2a are attached is the existing side, and the side to which the bolts and nuts are not yet attached is the new side.

Then, as shown in each drawing, the end plate 4 of the existing steel segment 1 (corresponding to a joint plate for temporary assembly).
, The end plates 4 of the new steel segments 1 are brought into contact with each other, and the existing steel segments 1 are newly installed by temporarily fixing bolts and nuts 17 over the temporary coupling bolt holes provided in these end plates 4. The steel segment 1 of 1 is temporarily fixed. Such steps are sequentially performed to build an annular segment annular body such as a rectangle as shown in FIG. In the case of a rectangular annular body, side faces or L-shaped steel segments are provided at the four corners (however, not shown).

Next, the attachment plate 3 arranged on the inner surface of the main girder 2 which is in contact with the new side of the steel segment 1 on the existing rectangular annular body side, and the existing side of the new rectangular annular body on the existing side. The splicing plate 3 disposed on the inner surface of the main girder 2 is pulled out in the same direction, and superposed on each main girder 2 of the adjacent steel segment 1, so that the splicing plate 3 is placed between the two main plates. Two girders 2 are sandwiched, and tightened by bolts 10 and nuts 11 inserted across them.

Further, the splicing plates 3 temporarily fixed to the intermediate main girders 2a of the new steel segments 1 are likewise drawn out in the same direction and the intermediate main girders of the steel segments 1 adjacent to each other in the longitudinal direction of the main girders. Tighten with 2a, bolt 10 and nut 11.

The main girders 2 and 2a of the steel segment 1 and the main girders 2 and 2a of the new steel segment 1 which are in contact with the new side of the existing steel segment 1 are bolts of these bolts. Tighten with bolts and nuts inserted through the holes.

Regarding the splicing plate 3 which is temporarily fixed to the inner surface of the main girder 2 of the new steel segment 1, a rectangular annular body is constructed by the next newly temporarily assembled steel segment 1. Then pull out and tighten with bolts and nuts. Further, as described above, the front and rear, right and left of the steel segment 1 having the rectangular annular body built therein are watertightly joined by the annular waterproof packing fitted in the concave groove 13, so that the spring water in the ground is the steel segment. No water leaks from between.

In the illustrated example of the present invention, the splicing plate 3 is pulled out from one end plate 4 of each steel segment 1 and fixed,
Further, although the structure is such that it can be retracted and built into the segment, the present invention is not limited to this. For example, two types of steel segments are prepared, and in the first steel segment 1, the splicing plates 3 can be drawn out from the end plates 4 at both ends thereof. The plate 3 may not be provided, and only the openings 6 into which the splicing plate 3 can be inserted may be provided in the end plates 4 at both ends, and the other configurations may be the same as those of the first steel segment 1. In this case, the first steel segment 1
In the above, two splicing plates 3 are superposed on one surface (one side surface) of the main girders 2 and 2a, and the main girders 2 and 2a are attached by tape or the like.
It is recommended to temporarily fix it in place.

Further, in the above embodiment, the planographic steel segment 1 is shown, but the arc-shaped main girders 2, 2 are shown.
In addition to using a, it is also possible to construct a circular segment ring by using an arc-shaped splice plate. Furthermore, the interior space surrounded by the main girder 2, the intermediate main girder 2a, the end plate 4, and the skin plate 16 may be filled with concrete or mortar.

[0022]

As described above, according to the present invention, the splicing plate projecting from the end plate of one steel segment is inserted through the opening formed in the end plate of the other steel segment and joined to each other. In the two steel segments, the steel segment is joined by aligning the splicing plate with the main girder or the intermediate main girder and fixing them to each other using fasteners. When a force is applied from the inside of the tunnel inner wall such as a rectangular cross section formed by connecting segments, the force acts in the direction separating the steel segments, and when the force is applied to the attachment plate, this attachment The force of the plate is first transmitted to the main girders and the intermediate main girders of the steel segment and not directly to the end plates that are joints, so that there is no problem such as partial deformation of the end plates. Then, the separating force is received by the entire steel segment by dispersing the force through the splicing plate, so that the steel segment is deformed or the joint is deformed to form a gap, and the water blocking performance is reduced. It has the effect of eliminating such problems.

Further, since the opening for inserting the splicing plate provided on the end plate of the steel segment is not open to the upper and lower ends, the jack reaction force during the propulsion of the shield excavator causes the splicing plate, the reinforcing ribs, etc. Does not become an eccentric load on the opening part steel plate,
Therefore, the proof stress that resists this is not easily reduced, and a large proof stress can be maintained. Moreover, the end plates (that is, the joint plates joined between the segments) are located above and below the opening.
It is possible to secure a portion without a defect in the portion, and a waterproof sealing material for waterproofing can be freely attached to the non-defective portion, so that a steel segment having a high waterproofness can be obtained.

Although it is difficult to attach the splicing plate to this segment after the steel segment is assembled, the splicing plate penetrates through the opening and is frictionally joined to the main girder and the intermediate main girder. Therefore, before the segment assembly, the splicing plate is built in the segment, and after the temporary assembly of the segment, the splicing plate is pulled out along the main girder of the segment to be joined and the end plate of the mating steel segment is If it is configured to be inserted into the inside through the opening, it is possible to easily construct a friction joint with the steel segment on the other side.

[Brief description of drawings]

FIG. 1 is a perspective view of a steel segment according to an example of the present invention.

FIG. 2 is a front view of a steel segment with a splicing plate accommodated therein.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a cross-sectional explanatory view showing a state where a steel segment according to the present invention is assembled as a tunnel inner wall having a rectangular cross section.

FIG. 6 is a front view of a state in which a plurality of steel segments of FIG. 1 are being joined.

FIG. 7 is a front view of a state in which joining of a plurality of steel segments in FIG. 6 is completed.

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9 is a sectional view taken along the line DD in FIG. 7;

FIG. 10 is a sectional view taken along the line EE in FIG. 7;

[Explanation of symbols]

 1 Steel Segment 2 Main Girder 2a Middle Main Girder 3 Steel Splice Plate 4 End Plate 4a Continuous Part 4b End Arm Piece 5 Intermediate Vertical Rib 6 Splice Plate Insertion Opening 7 Fastener 8 Bolt Insertion Hole 9 Steel Vertical ribs 9a Steel plate arm pieces 10 Bolts 11 Nuts 12 Through holes for bolt insertion 13 Recessed grooves 14 Bolt insertion holes 15 Tunnel 16 Skin plate 17 Temporary fixing bolts and nuts

Claims (5)

[Claims] 1. A steel segment, in which an end plate is provided at an end of a main girder, is inserted into the openings of the end plates of the first and second steel segments facing each other, and is located on the back side thereof. A splice plate that can be fixed along the main girder is provided through the opening of the end plate of the steel segment, and the base end of the splice plate is arranged along the main girder of the steel segment. And a steel segment characterized by being fixed to the main girder by a fixing tool. 2. The steel segment is provided with an intermediate main girder in parallel with the main girder, and the intermediate main girder is inserted through the openings of the end plates of the first and second steel segments which face each other, to the back side thereof. A splicing plate that can be fixed along the intermediate main girder positioned is provided by inserting through the opening of the end plate of the steel segment, and the base end of the splicing plate is the middle of the steel segment. The steel segment according to claim 1, wherein the steel segment is arranged along the main girder and is fixed to the intermediate main girder by a fastener. 3. The fixing member of each splicing plate in the steel segment is detachably attached to the portion to be fastened, and each splicing plate is provided so as to be drawn out from the end plate of the steel segment. The steel segment according to claim 1 or 2, wherein the steel segment is built in the steel segment and temporarily fixed. 4. A first girder provided with an end plate at an end of a main girder.
In the joint structure of the second steel segment and the second steel segment, the base end side is along one or both of the main girder and the intermediate main girder of the first steel segment and fixed by a fastener, and the tip side is the main girder. And an opening formed in a reinforcing rib disposed at a right angle to the intermediate main girder, and an attachment plate projecting from the end plate through the opening formed in the end plate is made of the second steel. Joint structure of steel segment characterized in that it is inserted from an opening opened in an end plate of the segment, and is fixed along a main girder or an intermediate main girder of the second steel segment by a fixture . 5. A first girder provided with an end plate at an end of a main girder.
And a second steel segment joining method, a splicing plate that is built in the first steel segment in a temporarily fixed state along the main girder of the first steel segment,
It is moved along the main girder and through the openings of the reinforcing ribs arranged at right angles to the main girder, and is pulled out from the opening formed in the end plate, and the base end side of this splicing plate is fixed to the main girder. Fixed by using, the tip side of this splicing plate is inserted from the opening of the end plate of the second steel segment, along the main girder through the opening of the reinforcing rib at a right angle to the main girder, A method for joining steel segments, characterized by fixing to this main girder using a fastener.