JP3373110B2 - Steel shell segment connection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel shell segment connecting structure having a steel shell peripheral frame used for tunnel lining.

[0002]

2. Description of the Related Art Conventionally, a lining steel shell segment used for excavating a shield tunnel has a connection structure, particularly in the tunnel circumferential direction (curving direction), as follows.
It That is, in the connection structure of steel shell segments,
Is a steel shell segment that has an arc shape when viewed from the tunnel axis direction.
Side plates on both sides of the tunnel in the axial direction and the circumferential direction of the tunnel
There are multiple bolt holes on each end plate of the
Steel to be connected in the axial direction of the tunnel and in the circumferential direction of the tunnel
Join the side plates and end plates of the shell segment together.
Insert the joining bolt into the bolt hole,
By tightening the nut on the
The steel shell segments that are adjacent to each other in the circumferential direction are firmly connected.
I'm tied.

By the way, the demand for mechanization and labor saving promoted in various industrial fields is no exception in the field of tunnel lining, and the moving arrangement from the loading of the segment into the tunnel to the inner peripheral wall of the excavation, each segment It is desired that an automatic machine including a carry-in device, an erector device, a pressing jack, etc. be used for work such as assembly and connection between the machines, and mechanical means be used as much as possible, and that a small number of workers work quickly and safely. . However,
One of the causes of hindering the mechanization is that the connecting work between the segments is performed by the bolts and nuts.

In the tunnel lining by the segment, the proportion of the segment connecting work cannot be ignored. Therefore, the segment connecting means using the bolts and nuts, which cannot be automated, is not widely used, but rather the characteristic of the applicant. The steel shell segment of Kaihei 4-330197 is popular as a segment suitable for automation.

Further, what is required of the connecting portion between the segments (particularly, the connecting portion in the tunnel circumferential direction) is that the segments are not separated from each other in the circumferential direction, that this connecting portion keeps the water stop, The connection work can be automated,
The structure of the segment connecting portion is selected within a range in which any one of them is not extremely sacrificed in consideration of the above-mentioned three points. A structure has been proposed.

In Japanese Patent Laid-Open No. 4-330197, there is a segment joint structure characterized by the automation of segment assembly and the waterproofness. The arcuate end faces of this segment are made of substantially H-shaped steel, The gap between the outer flange, the inner flange and the web is filled with water-stopping mortar to maintain the water-stoppage of the circumferential joints of the segments and not interfere with automatic assembly by an automatic machine. There is.

[0008]

Although the above-mentioned steel shell segment structure is a structure suitable for automation of assembly, it is necessary to fill the voids of the connecting portion with mortar for stopping water, and therefore, the site is required. Therefore, there is a problem in that equipment and work for kneading cement and sand, work for filling the mortar into the voids, and the like are considerably troublesome, and the cost required for the mortar is low. For this reason, there is a strong demand for a segment connecting structure that does not use mortar and that is a structure suitable for automation by an automatic machine.

As a result of various studies on the above-mentioned problems, the inventor of the present invention has a structure in which the mortar is not used for the segment connecting portion, and the segment connecting portion has a water-stopping structure, and a connecting portion suitable for automation. In order to make the structure, the connecting part structure where the arcuate both end surfaces of the steel shell segment can make surface contact, and the connecting in the circumferential direction between the segments is performed only by the press-fitting operation of the segments in the tunnel axial direction using an automatic machine. It was concluded that these two conditions must be met. An object of the present invention is to provide a connecting structure of steel shell segments which can satisfy such conditions.

[0010]

In order to achieve the above-mentioned object, a connecting structure of steel shell segments according to the present invention has a structure in which both ends of steel shell side plates having a pair of arcs and arranged in parallel are formed. , The end of a flat plate-shaped end plate placed in parallel
The steel shell segment main body is fixed to each other, and in the steel shell segment in which the inner space of the steel shell segment main body is filled with concrete, the arrangement is reversed at both ends of the steel shell segment, and respectively. The engaging projections and the engaging holes are provided at the four corners of the steel shell segment such that the axis of the steel shell segment is in the axial direction of the steel shell segment, and the engaging projections project outward from the steel shell side plate. The steel shell to be welded to the side plate of the steel shell, the engaging hole is opened in the connecting plate welded to the side plate of the steel shell so as to project from the end surface of the end plate, and the steel shell to be joined in the tunnel circumferential direction. It is characterized in that the end plates of the segments are shifted in one direction of the tunnel axis so as to be in surface contact with each other, and then moved in the other direction of the tunnel axis so that the engaging projection fits into the engaging hole. Further, the connection structure of the steel shell segment of the present invention, in the key steel shell segment used in combination with the steel shell segment, the arrangement is the same in the tunnel axial front surface and rear surface of the key steel shell segment. , And the engaging projections and the engaging holes are provided at the four corners of the key steel shell segment such that their respective axes are in the axial direction of the key steel shell segment, and the engaging projections are provided outside the steel shell side plate. This steel shell side plate is welded to the side surface plate of the steel shell so as to project in one direction, and the engagement hole is formed in the connecting plate welded to the side plate of the steel shell so as to project from the end surface of the end plate, and this key steel shell segment is formed. By moving in the axial direction of the tunnel, the engagement protrusions on the front side and the engagement holes on the rear side are fitted to the engagement holes and the engagement protrusions of the existing steel shell segment located on both sides of the engagement protrusion. And

According to the present invention, the engaging projection is operated by a simple operation of moving and arranging the steel shell segment at a predetermined position in the circumferential direction of the tunnel and pressing the same in the axial direction of the tunnel with a slight distance. Can be fitted into the engagement hole, whereby the tunnel circumferential end faces of the respective steel shell segments can be connected by surface contact using mechanical means.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. 1 to 11 show a steel shell segment according to the present invention.
An example of a connecting structure in the circumferential direction of the tunnel is shown. Further, FIG. 12 shows a structure of a connecting portion in the tunnel axial direction of the steel shell segment, and FIG. 13 shows a perspective view of an example of tunnel lining using the connecting means according to the present invention. .

As can be seen from the above figures, the steel shell main body 32 of the steel shell segment 6 is an arcuate steel shell side plate 5 made of H-shaped steel and arranged in parallel at a predetermined interval in the tunnel axis direction. The end face plate 20 is fixed to the arcuate end of the steel shell side plate 5.

The arc-shaped steel shell side plate 5 has a web 13 and
The inner flange 2 and the outer flange 7 are integrally provided at both ends of the web 13, and further, in the recesses 19 of the outer flange 7 of the left and right arcuate steel shell side plates 5 arranged in parallel, the steel plate is formed. A skin plate 17 made of steel is fixed by welding, and a steel shell main body 32 made up of the outer flange 7, the inner flange 2 and the web 13 and a reinforced concrete (reinforcing bar not shown) 14 filled in the steel shell segment 6 are formed. Is configured.

FIGS. 1 to 3 are views showing a single steel shell segment 6 curved in an arc shape in a cross-sectional view and partly omitted. In the figure, at one corner on one diagonal line of the quadrangle as viewed from the arc-shaped plane of the steel shell segment 6,
At the end of the web 13 of the steel shell segment 6, a connecting plate 23 having an engagement hole 22 formed so that its hole axis is in the axial direction of the steel shell segment 6 is fixed by welding 29.
The engagement hole 22 is located on the front side of the end plate 20 of the steel shell segment 6 so as to project therefrom.

Further, in the figure, at both ends of the other diagonal line of the quadrangle viewed from the arcuate plane of the steel shell segment 6, the axis line of the steel shell segment 6 is located on the end side surface of the web 13 of the steel shell segment 6. The engagement projection 30 is fixed by welding 29 so as to be in the axial direction.

The connection of the steel shell segments 6 in the circumferential direction is carried out in the order shown in FIGS. First, FIG.
A pair of steel shell segments 6 as shown in FIG.
The end plates 0 are arranged so that the respective end face plates 20 approach each other in the tunnel circumferential direction in a state where the steel shell segments 6 are displaced from each other in one direction of the tunnel axis so as not to hit the connecting plate 23.

Next, as shown in FIG. 3, the pair of steel shell segments 6 are brought close to each other in the tunnel circumferential direction until the end plates 20 come into surface contact with each other. At this time, the axes of the engagement protrusion 30 and the engagement hole 22 are aligned.

Finally, the pair of steel shell segments 6 are moved in the other direction of the tunnel axis while sliding the respective end plates 20. At this time, the engagement projections 30 and the engagement holes 22 are fitted on both sides of the steel shell segment 6, so that the steel shell segments 6 are connected in the tunnel circumferential direction and the surface contact state of the end face plate 20 is maintained. Be drunk In addition, the water-stop property is sufficiently ensured even if this connecting portion is not filled with mortar or the like.

If a further waterproofness is required, urethane foam may be injected into the small gap between the end plates 20 (not shown). In the above case, the erector (not shown) is used to move and arrange each steel shell segment 6 to a predetermined position in the tunnel circumferential direction.

Further, the movement of the steel shell segment 6 in the tunnel axial direction is carried out by a pressing jack (not shown). As described above, in the present invention, the steel shell segment 6 is moved all by mechanical means and by a simple operation. Connections in the circumferential direction of the tunnel can be performed.

As shown in FIG. 11, when forming the segment ring, the key steel shell segment 6a to be arranged at the end is formed.
However, the arrangement of the engaging projections 30 and the engaging holes 22 is slightly different from the other existing steel shell segments 6.

That is, in the key steel shell segment 6a, the arrangement is the same on the front surface and the rear surface in the axial direction of the tunnel, and the respective axes are in the axial direction of the key steel shell segment 6a. Engaging projections 30 and engaging holes 22 are provided at four corners of the key steel shell segment 6a, and the engaging projections 30 project from the steel shell side plate 5 of the key steel shell segment 6a. It is welded to No. 5. The engagement hole 22 is welded to the steel shell side plate 5 and is formed in the connecting plate 23 at a position projecting from the end face of the end face plate 20. Then, by moving the key steel shell side plate 6a in the tunnel axial direction, the engagement protrusion 30 on the front side and the engagement hole 22 on the rear side are engaged with the existing steel shell segment 6 located on both sides thereof. The fitting hole 22 and the engaging projection 30 are fitted together.

Next, as shown in FIG. 12 , on the steel inner flange 2 projecting forward from the existing steel shell segment 6 when viewed in the axial direction of the tunnel, a projecting joint end face 8 and a recessed joint end face 9 are provided. An inclined surface 3 that connects the protruding joint end surface 8 and the recessed joint end surface 9 is provided, and a proximal end portion of the inclined surface 3 is provided with a packing fitting groove 4 having a substantially semicircular cross section. A ring-shaped waterproof packing 26 is fitted in the packing fitting groove 4.

The left side portion of FIG . 12 shows a new steel shell segment 6 connected to the existing steel shell segment 6 in the tunnel axial direction, and is a pair of front and rear H-shapes extending in the tunnel circumferential direction. An arc-shaped frame member made of steel and a linear frame member extending in the axial direction of the tunnel are fixed to each other by welding to form a steel shell main body 32, and a recess is formed in the outer surface of the outer flange 21 on each side of the steel shell main body 32. 31, a skin plate 17 made of a steel plate is provided in the recess 31.
Are fixed by welding, and a new steel shell segment 6 is composed of a steel shell main body 32 consisting of the outer flange 21, the inner flange 2 and the web 13 and a reinforced concrete (reinforcing bar not shown) 14 filled therein. Has been done. Then, on the inner flange 2 of the H-section steel, the protruding portion joint end surface 15 and the recessed portion joint end surface 18 are arranged so as to be symmetrically arranged with the respective portions of the opposing inner flange 2 on the opposite side.
And an inclined surface 16 connecting between the protruding portion joint end surface 15 and the recessed portion joint end surface 18, and further, the inclined surface 1
A packing fitting groove 10 having a substantially semicircular cross section is provided at the base end portion of 6, and a ring-shaped waterproof packing 26 is fitted in the packing fitting groove 10.

In order to join the steel shell segments 6 in the axial direction of the tunnel, as shown in FIG. 12 , the inner flange 2 and the outer flange 21 to be joined of the respective segments are respectively provided with inclined surfaces 3, 16, 37, 38. As a guide. In this way, the protruding end joint end faces 8, 15, 3 of each flange
3, 34 and the concave joint end surfaces 9, 18, 35, 36 are in contact with each other, and the inclined surfaces 3, 16, 37, 38 are in contact with each other, as shown in FIG.
Is deformed by being pushed by the respective projecting portion joint end faces 8, 15, 33, 34, and thus the joint gap between the pair of inner flanges 2 facing each other in the tunnel axial direction and the joint gap between the outer flanges 21 are watertight. Are completely sealed, and the waterproofness of both flange joints is perfect. Reference numeral 43 is a mortar filled in the voids between the webs 13.

[0029]

As described above, according to the connecting structure of the steel shell segments of the present invention, the connecting of the steel shell segments adjacent to each other in the tunnel circumferential direction is performed at the four corners of the steel shell segment.
In addition, since the engaging projections and the engaging holes provided on the front and rear side surfaces in the tunnel axial direction are engaged with each other, there is no additional member on the end face plates of the steel shell segments adjacent to each other in the tunnel circumferential direction. Can be flat. Therefore, since the steel shell segments can be connected in the tunnel circumferential direction in a state where the end plates are in surface contact with each other, it is not necessary to fill the gap formed between the end plates with the mortar for water stop as in the conventional case. Since it is good, it is possible to omit the kneading equipment and various works involved in filling the mortar into the voids, and it is possible to significantly improve the efficiency of the connecting work of the steel shell segments that make up a large proportion in the construction of the tunnel lining, and to make mortar The cost required is no longer necessary and the construction cost can be reduced. Furthermore, the present invention has advantages in that it has a simple structure and is suitable for assembling a steel shell segment by an automatic machine.

[Brief description of drawings]

FIG. 1 is a partially omitted cross-sectional plan view of a steel shell segment according to the present invention, viewed with an arcuate convex portion facing upward.

FIG. 2 is a cross-sectional plan view showing a state of an end portion when a pair of steel shell segments of FIG. 1 are brought close to each other in a tunnel circumferential direction.

3 is a cross-sectional plan view showing a state where the end faces of the steel shell segment in the tunnel circumferential direction of FIG. 2 are in contact with each other.

FIG. 4 is a cross-sectional plan view showing a state in which the steel shell segment of FIG. 3 is moved in the tunnel axis direction and the engaging protrusion is fitted in the engaging hole.

FIG. 5 is a front view in the tunnel axis direction of the steel shell segment according to the present invention.

FIG. 6 is a partially omitted front view showing a state immediately before joining the steel shell segment of the present invention in the circumferential direction of the tunnel.

FIG. 7 is a partially omitted front view showing a state in which the steel shell segments of FIG. 6 are joined in the tunnel circumferential direction.

FIG. 8 is a one-side end view showing a partial cross section of a female steel shell segment to be joined in the tunnel axial direction.

FIG. 9 is a one-side end view showing a partial cross section of a male-side steel shell segment to be joined in the tunnel axial direction.

FIG. 10 is a cross-sectional view showing a joined state of steel shell segments in a tunnel circumferential direction.

FIG. 11 is a cross-sectional view showing a joined state of the key steel shell segment and the existing steel shell segments on both sides in the circumferential direction of the tunnel.

FIG. 12 is a cross-sectional view showing a waterproof joint between segment rings adjacent to each other in the tunnel axis direction in the segment of the present invention.

FIG. 13 is a perspective view of a segment lining according to the present invention.

[Explanation of symbols]

2 Inner flange 3 Inclined surface 4 Packing mating groove 5
Steel shell side plate 6 Steel shell segment 6a Key steel shell segment 6b Steel shell segment 7 Outer flange 8 Projection joint end face 9 Recessed joint end face 10 Packing fitting groove 1
3 Web 14 Reinforced concrete 15 Projection joint end face 16 Inclined surface 17 Skin plate 18 Recessed joint end face 19 Recess 20 End face plate 21 Outer flange 22 Engagement hole 23 Connecting plate 26 Ring-shaped water-stop packing 27
Ring-shaped waterproof packing 29 Welding 30 Engagement protrusion 3
DESCRIPTION OF SYMBOLS 1 Recessed part 32 Steel shell main body 33 Projection part joining end surface 34 Projection part joining end surface 37 Inclined surface 38 Inclined surface

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 11/00-11/40

Claims (2)

(57) [Claims] 1. A pair of flat plate-shaped steel plates arranged in parallel to each other at both ends of arc-shaped steel shell side plates arranged in parallel in pairs .
A steel shell segment body is formed by fixing the end portions of the end plates to each other, and in the steel shell segment in which the inner space of the steel shell segment body is filled with concrete, the arrangement is reversed at both ends of the steel shell segment. And the engaging projections and the engaging holes are provided at the four corners of the steel shell segment such that the respective axes are in the axial direction of the steel shell segment, and the engaging projections are provided outside the steel shell side plate. Welded to the steel shell side plate so as to project in one direction, the engagement hole is opened in the connecting plate welded to the steel shell side plate so as to project from the end face of the end face plate, and in the tunnel circumferential direction. The end faces of the steel shell segments to be joined are shifted in one direction of the tunnel axis to make surface contact, and then the other direction of the tunnel axis is moved so that the engaging projection fits in the engaging hole. Steel shell segment Consolidated structure. 2. A key steel shell segment used in combination with the steel shell segment according to claim 1, wherein the front and rear surfaces of the key steel shell segment in the tunnel axial direction have the same arrangement, and Engaging projections and engaging holes are provided at the four corners of the key steel shell segment such that the axis is in the axial direction of the key steel shell segment, and the engaging projections project outward from the steel shell side plate. Welded to this steel shell side plate, the engagement hole is opened in the connecting plate welded to the steel shell side plate so as to project from the end face of the end plate, and this key steel shell segment is formed in the tunnel axial direction. Steel shell characterized in that the engaging projections on the front surface side and the engaging holes on the rear surface side are fitted into the engaging holes and the engaging projections of the existing steel shell segments located on both sides thereof by moving Connection structure of segments.