JP3046241B2 - Joint structure and joining method of steel segments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the construction of pipes such as water supply and sewerage systems, subways, telegraph cable storage tunnels, underground passages, water intake tunnels, water discharge tunnels, and common ditches by a shield method or the like. The present invention relates to a steel segment used in the construction field such as when constructing a cylindrical structure such as a deep foundation pile, an underground space, a water storage tank, and the like, and particularly to a joint structure that is tensile-joined via bolts.

[0002]

2. Description of the Related Art Conventionally, as a joint structure in which main steel beams of opposite steel segments are tensile-joined via bolts,
What is described in Japanese Patent Publication No. 4-72039 is known. This is because, at the inside of the joint plate of the steel segment, both ends of a steel arch-shaped plate which is curved in an arc shape such that an intermediate portion is separated from the joint plate are fixed by welding, and a tie-deck is formed. A space is provided between the arch-shaped plate and the joint plate, and a bolt hole having a center line coincident with the bolt hole of the joint plate is provided at the center of the arch-shaped plate. -The opposite steel segments are joined by bolts passing through the bolt holes of the tie-shaped plate and the bolt holes of the joint plate.

[0003] The tie door of this arch-shaped plate,
The tightening force of the bolt or the tensile force of the bolt due to the external force can be directly transmitted to the main girder, and the tightening force or the tensile force of the bolt is distributed to the legs on both sides of the arched plate. As a result, a large joint strength and joint stiffness between the opposing steel segments can be ensured.

However, the above-mentioned arc-shaped plate can increase the local rigidity of the joint plate, but cannot increase the rigidity of the entire joint plate. Even if bolts are arranged over a wide area in the longitudinal direction of the joint plate, bolts that are far from the main girder bend the joint plate and hardly contribute to the tensile force as tension bolts. In addition, the load from the bolt can reduce the bearing pressure concentration on the joint plate by the above-mentioned arched plate, but there is no change in the total load on the joint plate, and a large tensile force is applied to the weld between the main girder and the joint plate. The force acts, which results in total penetration welding, which inevitably increases the cost.

[0005]

Therefore, when joining opposing steel segments, there is a need for a joint structure and joining method for steel segments which has high rigidity and strength, is easy to construct, and is inexpensive. ing.

[0006]

SUMMARY OF THE INVENTION In order to advantageously solve the above-mentioned problems, the present invention provides a steel segment having a main girder and a joint plate joined to an end of the main girder. And a longitudinal rib is disposed near the center of the main girder in the longitudinal direction, and the vertical rib, the joint plate, and the main girder form a joining beam, and the joint plate and the vertical the rib, the bolt holes so that axes coincide with each other between the opposing steel segment is provided, first the steel segments and which the over opposite second of said respective bolt holes of the steel segment When retracted, the tip is
Can be built into the steel segment without protruding
A dynamically provided fastener is inserted, the fastener is locked to each of the longitudinal ribs in the first and second steel segments, and the steel is formed by the fastener through the joint beam. The segment is fastened and fixed.

Further, the fixing tool according to the present invention is characterized in that the fixing tool comprises a bolt, a threaded rod, or a threaded rebar having a bolt inserted into each of the bolt holes provided in the joint plate and the longitudinal rib, and a nut screwed into the threaded rod.

Further, the fixing tool according to the present invention is characterized in that the fixing tool has a straight or curved shape.

In the joint structure for steel segments according to the present invention, a reinforcing steel rib for reinforcing the joint beam is provided in a space inside the joint beam formed by the joint plate, the vertical rib, and the main girder. It is characterized by being arranged.

[0010] Further, the present invention provides a method in which
Concrete is filled to form a composite structural joint beam, and both steel segments are fastened and fixed by the fixing tool via the composite structural joint beam.

According to the present invention, after the opposing steel segments are joined via the respective connecting beams and fastened and fixed by the fixing tool, a concrete is filled in the inner space of each of the connecting beams and synthesized. It is characterized by being structured and joined.

Further, according to the present invention, the steel segments facing each other are joined by the fasteners through the joint beams, and the entire inner space of each steel segment is filled with concrete.
It is characterized by a synthetic structure.

[0013] The present invention also relates to a joint structure of steel segments in which opposed steel segments are joined by the fasteners via the respective joint beams, wherein the fastener has a distal end which is lower than the joint plate when retracted. It is characterized in that it is movably provided so as to be able to be built into the steel segment without protruding.

Further, in the present invention, in a joint structure of steel segments in which opposing steel segments are joined by the fasteners via the respective joint beams, the steel segments are fixed so that the tips do not protrude from the joint plate. The fixture is built in the steel segment and temporarily assembled, and then, the tip of the fixing tool is pushed out to the steel segment side opposite to the joint plate to be joined.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 to 11 show a steel segment 1 according to a first embodiment of the present invention, in which two intermediate main girders 2a are arranged at substantially equal intervals between a pair of main girders 2 and A joint plate 4 is arranged in parallel with the main girder 2, and the joint plate 4 is in contact with both ends of each main girder 2, 2 a at right angles to the main girder 2, 2 a and is fixed by welding. Also skin plate 1
6 is the main girder 2, the joint plate 4, the intermediate main girder 2a, and the vertical rib 9
And is fixed by welding.

A plurality of reinforcing ribs (hereinafter referred to as steel vertical ribs) 9 are arranged at right angles so as to intersect with the main girders 2 and 2a in parallel between the left and right joint plates 4 at intervals. The main girders 2 and 2a are divided and arranged, and are fixed to the main girders 2 and 2a by welding.

In the steel segment 1, the joint plate 4, a longitudinal rib 9 arranged in parallel with the joint plate and near the center in the longitudinal direction of the main girder, the longitudinal rib 9 and the joint plate 4 The joining beams 10 are formed by the main girders 2 and 2a to which are bonded.

The joint plate 4 and the longitudinal rib 9 of the steel segment 1 are provided with bolt holes 6 and 6a so that their axes are aligned with each other. Then, the bolt holes 6, 6a of the first steel segment 1 and the bolt holes 6, 6a of the second steel segment 1 which coincide with the axes provided in the joint plate 4 and the vertical rib 9 are also provided. Fixture 3 across
And the fasteners 3 are locked to the vertical ribs 9 in the first and second steel segments 1, and the steel segments 1 are fastened by the fasteners 3 via the joint beams 10. And can be fixed.

The fixing tool 3 may be composed of a bolt or a threaded rod 7 and a nut 8 screwed thereto, as shown in the figure, or a threaded rebar and a nut (not shown) screwed thereto. is there.

FIGS. 12 and 13 show a second embodiment of the present invention, in which the joint beam 10 formed by the joint plates 4, the longitudinal ribs 9, and the main girders 2 and 2a is provided.
Each shows a state in which the reinforcing steel ribs 5 are provided. It should be noted that, in addition to the configuration shown in each drawing, a plurality of more steel reinforcing ribs may be provided, and the steel reinforcing ribs
It may be arranged diagonally between the main girders 2, 2a and the vertical ribs 9,
These may be used in combination.

FIGS. 14 and 15 show a third embodiment of the present invention. In each of the figures, concrete is filled in the joint beam 10 to form a composite structural joint beam 11, and this composite structural joint beam 11 is shown. 11 and the two steel segments 1
2 shows an example of fastening by tightening. In this case, the concrete is filled after the fixing tool 3 such as the screw rod 7 inserted into the bolt holes 6 and 6a is covered with a circular pipe or the like.

After the two steel segments 1 are fastened and fixed by the fasteners 3 via the joint beams 10, concrete is filled in the joint beams 10 to form a composite structural joint beam 11. May be. In this case, it is not necessary to cover the fixing tool 3 such as the bolt 7 inserted into the bolt holes 6 and 6a with a circular pipe or the like.

FIGS. 16 and 17 show a fourth embodiment of the present invention. In each of the drawings, after the steel segments 1 are joined via the joint beams 10, the entire steel segments are shown. The steel segment 12 is shown as being composite structured and filled with concrete.

FIGS. 2 to 4 show the fastener 3 incorporated in the steel segment 1 so that the tip of the fastener 3 movably provided to the steel segment 1 does not protrude from the joint plate 4. The state where it was made to run is shown. With such a configuration, the tip of the fastener 3 does not protrude from the steel segment 1 when the steel segment 1 is transported or assembled, so that the steel segment 1 can be rotated, rotated or lifted or suspended. It is convenient when lowering. As shown in FIG. 4, the diameter of the bolt holes 6 and 6a is larger than the diameter of the fixing tool 3 so that the fixing tool 3 can move. In the case of such a steel segment 1, the fixing tool 3 is incorporated in the steel segment 1 at a position where the tip of the fixing tool 3 does not protrude from the joint plate 4 and locked by a locking tool or the like. later,
The distal end of the fixing tool 3 is extruded from the joint plate 4 toward the opposing segment 1 and joined. When the fixing tool 3 is incorporated in the steel segment 1, it is temporarily fixed to the main girder 2 or the intermediate main girder 2a using fixing means such as an adhesive tape.

FIG. 18 shows a fifth embodiment of the present invention. When the fixing member 3 is inserted into each of the joining beams 10, it does not interfere with the other vertical ribs 9 so as to form an arc. It is curved. When using the screw rod 7a curved in an arc shape having male threads and nuts at both ends in this way, the curved screw rod 7a is temporarily inserted into the bolt holes 6, 6a after being temporarily assembled without being built in the steel segment 1. Let through
The two steel segments 1 are fastened and fixed via the joint beams 10. In this case, the bolt holes 6 and 6 a in the joint plate 4 and the vertical rib 9 are provided at positions that match the arc-shaped curved shape of the fixing tool 3.

Next, the temporary assembly process of the steel segment 1 according to the present invention will be described. When the steel segment 1 shown in FIGS. 1 to 4 is used to temporarily assemble a steel segment annular body to form, for example, an inner wall of a tunnel having a rectangular cross section, as shown in FIGS. Do. FIG. 5 shows an example in which the steel segment 1 of the present invention is configured as an inner wall of a tunnel having a rectangular cross section, and FIGS. 6 and 10 are views of the lower part of the inner wall of the tunnel 15. The direction of arrow G in each figure is the direction of the tunnel axis. In FIG. 6, the side where the steel segments 1 are joined by the fasteners 3 is the existing side, and the side where the fasteners 3 are built in is the new side.

As shown in the drawings, the joint plate 4 of the new steel segment 1 is brought into contact with the joint plate 4 of the existing steel segment 1, and the temporary joints provided on these joint plates 4 are provided. The new steel segment 1 is temporarily fixed to the existing steel segment 1 with the bolts and nuts for temporary fixing by the bolt holes 13. By sequentially performing such steps, a ring-shaped segment ring such as a rectangle in the first row is constructed as shown in FIG. In the case of a rectangular ring, a steel segment having an L-shaped side face is provided at each of the four corners. (However, not shown).

Next, the existing main beams, which are in contact with the new side of the steel segments 1 on the side of the rectangular annular body in the first row, are arranged at equal intervals in the longitudinal direction. Bolts 13 that are inserted into the new bolt holes 13 that are arranged at the same distance as the existing side in the longitudinal direction of the existing main girder in the second row of rectangular annular bodies. The two steel segments are temporarily fixed in the axial direction by the nut and the nut.

After the completion of the temporary fixing as described above, the fixing tool 3 incorporated in each steel segment 1 is pulled out, and the bolt hole 6 provided in the joint plate 4 of the steel segment 1 and the joint plate 4 are removed. Longitudinal ribs 9 arranged parallel to 4 and closer to the center
And a bolt hole 6a having an axis coinciding with the bolt hole 6 provided on the joint plate 4 and the same rib provided on the joint plate 4 and the vertical rib 9 on the segment 1 opposite to each other. Insert into the bolt holes 6, 6a having an axis,
On both sides of the longitudinal rib 9 of the both steel segments 1 near the center, the both steel segments 1 are fastened and fixed by the screw 7 and the nut 8.

In the joint structure of the steel segment 1 as described above, the joint plate 4 disposed at the end of the main girders 2 and 2a of the steel segment 1 at right angles to the main girder, A highly rigid joint beam surrounded by an intermediate vertical rib 9 arranged in parallel and near the center in the longitudinal direction of the main girder 2 and main girder 2 and 2a to which the vertical rib 9 and the joint plate 4 are bonded. 10 are formed. When the steel segments 1 are fastened by the necessary amount of fasteners 3 such as bolts through the joint beams 10, a joint structure of steel segments having large rigidity and strength is obtained.
There is no disadvantage that a part of the joint plate is bent as in the conventional example, and hardly contributes to the tensile force as a tension bolt. Also, even if the longitudinal ribs are bent by a strong tensile force, the joint plate 4 is not affected at all,
The effect as a joint structure is not reduced.

Further, as shown in FIGS. 12 and 13,
When the reinforcing steel rib 5 is disposed on the joint beam 10, the joint beam 10
The rigidity and strength of the steel segment are further increased, and a large joint strength and joint rigidity as a joint structure of steel segments can be secured.

As shown in FIGS. 14 and 15, the joint beam 10 is filled with concrete, so that the back of the joint plate 4 has a highly rigid concrete composite structure surrounded by a steel plate. Is formed, and the composite structural beam 1 is formed.
When the steel segments 1 are fastened by a required amount of fasteners 3 such as bolts 7 via the steel joints 1, a joint structure of steel segments having extremely large rigidity and strength is obtained.

As a joining method for filling the concrete, when the concrete is filled in the joining beam 10 after the steel segment 1 is fixed by the fixing tool 3 via the joining beam 10, the fixing is performed as it is. It is good to bury and kill the tool 3. In the case where the space inside the joint beam 10 is filled with concrete to form the composite structural joint beam 11 before the opposed steel segments 1 are fixed by the fixing tool 3, the bolts and the like are fixed after the concrete is hardened. In order to fasten the fixture 3, it is necessary to cover the fixture 3 with a circular pipe or the like before filling with concrete.

As another joining method for filling the concrete, as shown in FIGS. 16 and 17, after the steel segment 1 is fastened and fixed by the fixing tool 3, the whole steel segment 1 is filled with the concrete. According to this joining method, it is possible to obtain the synthetic structural steel segment 12 in which the strength of the steel segment 1 is further increased.

In the composite structural steel segment 12 in which the composite structural beam 11 or the entire steel segment is filled with concrete, the concrete is filled after the steel segment 1 is fastened and fixed by the fixing tool 3. Is
Until the assembly of the segment 1 and the fastening of the steel segment 1 by the fixing tool 3, the workability is good because only the light steel segment construction is required, and the concrete structuring of the joint portion is performed by finally casting concrete. Construction is easier.

In each of the above embodiments, the planographic steel segment 1 is shown, but a circular segment ring is constructed by using an arc-shaped main girder.

A fastener 3, such as a bolt, is stretched in the longitudinal direction of the main girder 2 and wrapped with the fastener 3 of the adjacent steel segment 1, or after being joined by a coupler, it is cooled.
And the adjacent steel segments 1 may be fastened.

The front and rear and left and right sides of the steel segment 1 in which the rectangular annular body is constructed are joined in a water-and-honey manner by an annular waterproof packing fitted into the concave groove 14, so that the underground spring water leaks from between the steel segments. Never do.

[0039]

According to the present invention, a rigid joining beam surrounded by a main girder, a joint plate and a vertical rib is formed at an end of a main girder of a steel segment. A joint structure of a steel segment having a large rigidity and strength capable of fastening the steel segment with a necessary amount of fasteners such as bolts is obtained.

By filling the joint beam with concrete, a highly rigid beam having a concrete composite structure surrounded by steel plates is formed on the back surface of the joint plate. When the steel segments are fastened by a necessary amount of fasteners such as bolts, a joint structure of steel segments having extremely high rigidity and strength is obtained.

Further, in the joining method of filling the entire joint beam or the steel segment with the concrete, only the construction of the lightweight steel segment is required until the assembly of the segments and the fastening of the steel segments by the fasteners. The workability is good and the steel structuring of the joint part can be done simply by laying concrete at the end, which makes the work easier.

Further, since the joint beam is formed and supported by a fixing tool such as a bolt, only a compressive force is generated at the welded portion between the joint plate and the main girder. ,
This has the effect of significantly reducing the cost of the steel segment.

Further, since the bolts or screw rods used in the present joint structure are generally long, they have a large elongation when tightened, and there is little looseness such as short bolts and screw rods.

[Brief description of the drawings]

FIG. 1 is a perspective view of a steel segment showing one example of the present invention.

FIG. 2 is a front view of a steel segment in a state in which a fastener is 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 an explanatory sectional view showing a state where the steel segment according to the present invention is assembled as a tunnel inner wall having a rectangular 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 sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view taken along line DD of FIG. 6;

FIG. 9 is a sectional view taken along the line EE in FIG. 6;

FIG. 10 is a front view showing a state where joining of a plurality of steel segments in FIG. 6 has been completed.

FIG. 11 is a sectional view taken along line FF of FIG. 10;

FIG. 12 is a front view of a steel segment provided with a reinforcing steel rib.

FIG. 13 is a sectional view taken along line HH in FIG.

FIG. 14 is a front view of a steel segment in a state where a concrete is cast on a joint beam.

FIG. 15 is a sectional view taken along line II of FIG. 14;

FIG. 16 is a front view of a steel segment in a state where concrete is entirely cast.

FIG. 17 is a sectional view taken along line JJ of FIG. 17;

FIG. 18 is an explanatory cross-sectional view of a steel segment using an arc-shaped screw rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel segment 2 Main girder 2a Intermediate main girder 3 Fixing tool 4 Joint plate 5 Reinforcement rib 6 Bolt hole 6a Bolt hole 7 Screw 7a Arc screw 8 Nut 9 Vertical rib 10 Joining beam 11 Synthetic structural joining beam 12 Synthetic structuring Steel segment 13 Temporary fixing bolt hole 14 Circular groove for annular waterproof packing 16 Skin plate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-34789 (JP, A) JP-A-7-4190 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/04 E21D 11/14

Claims (10)

(57) [Claims] In a steel segment in which a main girder and a joint plate are joined to an end of the main girder, a vertical rib is disposed in parallel with the joint plate and near a longitudinal center of the main girder. The joint rib is constituted by the longitudinal rib, the joint plate, and the main girder, and the bolt hole is formed so that the joint plate and the longitudinal rib of the steel segment have the same axis between the opposing steel segments. Over the respective bolt holes of the first steel segment and the second steel segment facing the first steel segment, so that the tip does not protrude from the joint plate when retracted so that the tip can be built into the steel segment. Through the fasteners movably provided on the first and second steel segments, the fasteners are locked to the longitudinal ribs in the first and second steel segments, and the two fasteners are used by the fasteners via the joining beams. To secure the segments A joint structure of a steel segment, characterized in that: Wherein said fastener includes said joint plate, a bolt or threaded rod is inserted through the bolt holes provided in the longitudinal ribs and consists of a nut screwed on one of these, according to claim 1, wherein the steel Segment joint structure. 3. The joint structure for a steel segment according to claim 1, wherein the fastener comprises a threaded rebar inserted through each bolt hole provided in the joint plate and the longitudinal rib, and a nut screwed into the threaded rebar. . 4. The joint structure for a steel segment according to claim 2, wherein the fixing tool has a straight or curved shape. And wherein said coupling plate, and the longitudinal ribs, the main digits and the inner space of the joint beam formed by, according to claims 1, were provided with stiffening ribs for reinforcing the bonding beam
Item 5. A joint structure for a steel segment according to any one of items 4 to 6 . 6. An interior space of the joint beam is filled with concrete to form a composite structural joint beam, and the first and second steel segments are attached to the fastener via the composite structural joint beam. The joint structure for a steel segment according to any one of claims 1 to 5, wherein the joint is fastened and fixed. 7. A longitudinal rib is provided in parallel with a main girder and a joint plate joined to an end of the main girder and near a longitudinal center of the main girder. And the main girder constitutes a joint beam, the joint plate and the vertical rib,
In a method for joining steel segments, a fastener is inserted through each of the bolt holes of the first and second steel segments, which are provided with bolt holes so that the axes of the opposed steel segments are aligned with each other. At the time of retreat, the fastener provided so that the tip does not protrude from the joint plate is built in the steel segment and temporarily assembled, and thereafter, the tip of the fastener is moved to the steel segment side opposite to the joint plate. A method for joining steel segments, comprising extruding and fastening both steel segments by means of the fixing tool via the joining beam. 8. The steel according to claim 7, wherein a reinforcing steel rib for reinforcing the joining beam is provided in an inner space of the joining beam formed by the joint plate, the vertical rib, and the main girder. Method of joining plastic segments. 9. A composite structural beam is filled in a space inside the joint beam to form a composite structural joint beam, and the first and second steel segments are attached to the fastener via the composite structural joint beam. The method for joining steel segments according to claim 7 or 8 , wherein the steel segments are fixed by fastening. 10. The steel segments facing each other are joined via said joint beams, and are tightened and fixed by said fixing tools, and then, the interior space of each joint beam or the entire inner space of the steel segments is concreted. any of claims 7 to 9 is filled bets, characterized in that the composite structure of
2. The method for joining steel segments according to claim 1 .