JP2015071904A - Joint structure of steel shell element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maximally restrain an increase in boring thrust in element propulsion time, and to surely maintain water cutoff performance by surely filling a grout material.SOLUTION: A joint structure is composed of a recessed joint 3 having a groove part 5 provided in an adjacent one steel shell element 2 and opening along the axial direction of the steel shell element 2 and a water cutoff part 6 for blocking up an opening of the groove part 5 and a projection joint 4 provided in the other steel shell element 2 and having a projection strip part 12 inserted into the opening of the groove part 5, and the water cutoff part 6 is composed of double packing 10 composed of plate spring-like packing 8 and auxiliary packing 9 of respectively extending toward the opening central direction from both sides of the opening and a water cutoff skid 11 filled between these, and the mutual auxiliary packings 9 and 9 are provided so as to have an overlapping margin in an opening central part. When fitting the mutual joints, the projection strip part 12 is fitted-inserted between both-side packings 8,etc., 9, etc. while deforming the packing 8 and the auxiliary packing 9 so as to be respectively expansively opened.

Description

  The present invention relates to a joint structure of a steel shell element for constructing an underground structure with the steel shell element by non-cutting under a route by sequentially inserting the steel shell element while being connected to a steel shell element that has already been penetrated. .

  Conventionally, as one of the construction methods for constructing a tunnel that is three-dimensionally crossed below a road line or railway line, a special steel joint is used, and a square steel shell element divided into about 1 m is connected to the joint. It is continuously installed in the soil, and the steel shell element is filled with concrete to construct the structure body. The structure body is then excavated and the structure is excavated. The finishing method is known.

  In such a construction method, a joint for joining adjacent steel shell elements is a very important member that functions as a guide when propelled and functions as a tension member when completed. In order to ensure these functions, the ground and backing material are prevented from flowing into the joint during propulsion, and after propulsion, the grout material injected into the joint is prevented from flowing out, ensuring that Need to be filled.

  As a joint structure of a steel shell element, for example, in the following Non-Patent Document 1, as shown in FIG. 12, a concave joint 50 having a groove portion 52 having a C-shaped cross section and a protrusion 53 that can be fitted into the groove portion 52. The thing consisting of the convex coupling 51 which has is proposed.

  However, in the conventional joint structure shown in FIG. 12, when propelling the element, as shown in FIG. 13, the groove portion 52 of the concave joint 50 is filled with clay 55 or the like to prevent inflow of earth and sand and the backing material. However, such filling of clay 55 and the like has a problem in that the thrust increases and there is a problem in long-distance construction, and there is a problem that the excavation thrust increases when the convex joint is pushed and fitted. It was. Further, when the grout material 54 is filled after the fitting of the concave and convex joint is completed, the filling of the grout material 54 is obstructed, and there is a possibility that sufficient tensile performance cannot be obtained in the joint structure. Furthermore, as shown in FIG. 12, even if the clearance between the concavo-convex joints is filled with a grout material, there is a high possibility that the grout material 54 will flow out of the opening of the groove 52. It was.

  Therefore, in the following Patent Document 1, the applicants are provided with a groove portion having a U-shaped cross section formed by a side plate (side portion) facing each other and a bottom plate that joins one end portions of these side plates, A joint structure has been proposed in which two water-stopping rubbers (water-stopping members) are attached to the inner side surface of the other end of each side plate so as to sandwich the protruding portion and are attached over the axial direction. In such a joint structure, when the element is propelled, the groove is filled with a lubricant, and the water-stopping rubber and the lubricant ensure the water-stopping property. After the element is completely propelled, the lubricant in the groove is removed. After removing and cleaning with high-pressure washing water, non-shrinkage cement milk (hardening material) is injected into the groove to integrate the groove and the protrusion.

JP 2007-191979 A

Kazuhiko Shimoda and Masahiro Uchida, “Examination of rectangular steel pipe propulsion method under critical structure, 57th Annual Scientific Lecture, Japan Society of Civil Engineers, September 2002, p177-178”

  However, in the joint structure described in Patent Document 1, two waterproof rubbers are attached to the inner surface side of the opening side of both side plates of the groove portion so as to sandwich the protruding portion, and at the time of propelling the element, The groove portion is filled with a lubricant, and the water-stopping rubber and the lubricant are used to secure water-stopping properties. However, with only the water-stopping rubber protruding from both sides toward the center of the opening, the ridges are on both sides. When the construction error is large, there is little absorption of construction errors, such as when the construction error is large, and sufficient water stoppage cannot be secured when the construction error becomes large. When the grout material was injected after completion of the combination, the grout material flowed out, and there was a possibility that the filling of the grout material and the tensile performance of the joint could not be ensured.

  Therefore, the main problem of the present invention is to suppress the increase of the digging thrust at the time of element propulsion as much as possible, to ensure sufficient tensile performance by reliably filling the grout material, and to maintain the water-stopping property reliably An object of the present invention is to provide a steel shell element joint structure which is made possible.

In order to solve the above-described problem, the present invention according to claim 1 is a steel shell element joint structure for constructing an underground structure by sequentially inserting steel shell elements while being connected to a penetrated steel shell element. There,
The joint structure is provided in one adjacent steel shell element, and has a groove joint that opens along the axial direction of the steel shell element, a concave joint including a water stop portion that closes the opening of the groove portion, and the other steel shell. It is provided with an element, and consists of a convex joint provided with a protrusion that is inserted into the opening of the groove,
The water stop portion has a leaf spring-shaped packing extending from both sides of the opening toward the center of the opening, and the protruding portion expands the packing when the concave joint and the convex joint are fitted. A steel shell element joint structure is provided, which is inserted between the packings on both sides while being deformed in this manner.

  In the first aspect of the present invention, the joint structure of the steel shell elements is provided in one adjacent steel shell element and opens along the axial direction of the steel shell element, and the stopper that closes the opening of the groove portion. What consists of a concave joint provided with a water part and a convex joint provided in the other steel shell element and provided with the protrusion part inserted in opening of the said groove part is used. The water stop portion has a leaf spring-shaped packing extending from both sides of the opening toward the center of the opening, and the protruding portion expands the packing when the concave joint and the convex joint are fitted. Since the gasket is inserted between the packings on both sides while being deformed, the packing comes into pressure contact with the ridges, and when the element is propelled, it is possible to prevent the inflow of earth and sand or a backing material from outside At the same time, when the grout material is filled in the groove after the fitting is completed, the injected grout material can be prevented from flowing out. Therefore, the water-stopping property can be reliably maintained, and the grout material can be reliably filled, and sufficient tensile performance can be obtained.

  In addition, since the inflow of earth and sand and a backing material can be prevented by the packing without filling clay or the like in the groove portion of the concave joint at the time of element propulsion, it is possible to suppress an increase in excavation thrust at the time of element propulsion. The grout material can be reliably filled, and sufficient tensile performance of the joint structure can be obtained.

  As the present invention according to claim 2, there is provided the joint structure of the steel shell element according to claim 1, wherein each of the packings is bent toward the inner side of the groove and the ends thereof are butted together. .

  In the invention according to the second aspect, the packing is expanded when the concave joint and the convex joint are fitted together by bending the packing toward the inner side of the groove portion and providing the ends so as to face each other. It becomes easy to do, and it becomes possible to secure smooth element propulsion.

  According to a third aspect of the present invention, the water stop portion includes the packing and a leaf spring-shaped auxiliary packing that is provided outside the packing and extends from both sides of the opening toward the center of the opening. The auxiliary packing is provided so that the auxiliary packings have an overlap allowance at the center of the opening, and when the concave joint and the convex joint are fitted, the protruding portion expands the packing and the auxiliary packing, respectively. The joint structure of the steel shell element according to claim 1, which is fitted between the packings on both sides while being deformed so as to be opened.

  The invention according to claim 3 is provided with a double packing comprising the packing and an auxiliary packing provided outside the packing, and the auxiliary packings are provided so as to have an overlap margin at the center of the opening. Therefore, when the steel shell element is penetrated into the ground in advance, the steel shell element can be propelled without earth or sand or a back-filling material or the like flowing into the groove portion of the concave joint.

  Further, when the concave joint and the convex joint are fitted, the protruding portion is inserted between the packings on both sides while being deformed so as to expand the packing and the auxiliary packing, respectively. When propelling the element, the auxiliary packing on the outside can prevent the inflow of earth and sand and backing material from the outside, and the grout is inserted into the groove after the fitting is completed. When filling the material, the grout material injected mainly by the inner packing can be prevented from flowing out. Therefore, the water-stopping property can be reliably maintained, and the grout material can be reliably filled, and sufficient tensile performance can be obtained.

  As the present invention according to claim 4, there is provided the joint structure of the steel shell element according to claim 3, wherein the water stop portion has a water stop lubricant filled between the double packings. .

  In the invention according to the fourth aspect, a water-stopping slip material is filled between the double packings. The water-stopping lubricant plays a role as a slipping material when fitting the concave joint and the convex joint as well as serving as a water-stop aid.

  As the present invention according to claim 5, the concave joint has a locking portion protruding from both sides in the groove portion, and the convex joint is locked to the locking portion at a tip of the ridge portion. A joint structure for a steel shell element according to any one of claims 1 to 4, which has a protrusion.

  In the invention according to claim 5, the concave joint has a locking portion protruding from both sides in the groove portion, and the convex joint locks the locking portion at the tip of the ridge portion. By having the projection, the locking portion and the locking of the projection function as a guide when the element is propelled, and also function as a tension member when the propulsion is completed.

  According to a sixth aspect of the present invention, after the concave joint and the convex joint are fitted, a grout material is filled in the gap between the concave joint and the convex joint, and the concave joint and the convex joint are integrated. 5. A steel shell element joint structure according to any one of 5 is provided.

  In the invention of claim 6, after fitting the concave joint and the convex joint, the gap between the concave joint and the convex joint is filled with a grout material, and these are integrated, so that the adjacent steel shell elements are integrated. Force transmission is possible.

  As the present invention according to claim 7, the concave joint is fixedly provided on both sides of the opening side end portion of the structure portion having a locking portion protruding from both sides in the groove portion, and the packing is attached. The steel shell element joint structure according to any one of claims 1 to 6, wherein the steel shell element joint structure is formed as a divided structure including a side wall portion.

  In the invention according to claim 7, the concave joint includes a locking portion that protrudes from both sides in the groove portion, so that a structure portion that receives a force such as a tensile force acting on the joint structure, A split structure is provided which is fixed to both sides of the opening side end portion and includes a side wall portion to which the packing is attached. By adopting such a divided structure, the attachment of the packing can be improved.

  According to an eighth aspect of the present invention, there is provided the joint structure of a steel shell element according to the seventh aspect, wherein the structural portion is made of cast or hot stamped steel.

  In the invention according to the eighth aspect, the casting cost or the hot stamped steel portion, which requires a high production cost, is used only as the structure portion to reduce the production cost and improve the manufacturability.

  As a ninth aspect of the present invention, there is provided the joint structure for steel shell elements according to any one of the seventh and eighth aspects, wherein the structure portion and the side wall portion are connected by a bolt.

  In the invention according to the ninth aspect, since the structure portion and the side wall portion are connected by bolts, the assembling is simplified and the attachment property of the packing itself is improved.

  The steel shell according to any one of claims 1 to 9, wherein the concave joint and the convex joint are connected to members extending from an outer end portion and an inner end portion of the steel shell element, respectively. An element joint structure is provided.

  In the invention described in claim 10, since the concave joint and the convex joint are respectively connected to members extending from the outer end and the inner end of the steel shell element, the steel shell element is fitted when the steel shell element is fitted. The effective height can be increased and the bending strength of the underground structure can be prevented from decreasing.

  The steel shell according to any one of claims 1 to 10, wherein a bolt for preventing expansion between both side walls is provided so as to connect both side walls of the groove portion as the present invention according to claim 11. An element joint structure is provided.

  In the invention described in claim 11, when the concave joint and the convex joint are fitted, the bolts for preventing the expansion between the both side walls are provided so as to connect the both side walls of the groove portion. Even if a tensile force is applied to the groove, the opening of both side walls of the concave joint is prevented, and the state in which the groove is filled with the grout material can be reliably maintained.

  As described above in detail, according to the present invention, it is possible to suppress the increase of the digging thrust at the time of element propulsion as much as possible, to obtain sufficient tensile performance by reliably filling the grout material, and to ensure water-stopping. Can be maintained.

It is sectional drawing of the underground structure by the steel shell elements 2, 2 ... using the joint structure 1 which concerns on this invention. 2 is a cross-sectional view of a steel shell element 2. FIG. 2 is a cross-sectional view of the joint structure 1. FIG. 3 is a cross-sectional view of a concave joint 2. FIG. 3 is an enlarged cross-sectional view of a water stop portion 10. FIG. 3 is a diagram (part 1) showing a construction procedure of the steel shell element 2; FIG. 4 is a construction diagram (part 2) of the steel shell element 2; FIG. 4 is a construction diagram (part 3) of the steel shell element 2; FIG. 4 is a construction procedure diagram (No. 4) of the steel shell element 2; FIG. 5 is a construction procedure diagram (No. 5) of the steel shell element 2; It is sectional drawing of the joint structure 1 which concerns on another form example. It is sectional drawing which shows the conventional joint structure. It is sectional drawing which shows the conventional concave joint 50. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In the present invention, as shown in FIG. 1, a plurality of steel shell elements 2, 2,... This is the joint structure 1 of the steel shell elements 2 and 2 used in the square steel pipe propulsion method for constructing an underpass tunnel by constructing an underground structure closed to the ground and excavating the internal sand and sand.

  As shown in FIG. 2, the steel shell element 2 is an element having a rectangular cross section constituted by an upper plate 20, a lower plate 21, and side plates 22 and 22. On both side surfaces, the upper plate 20 serving as the outer end portion of the underground structure and the lower plate 21 serving as the inner end portion are respectively extended laterally, and the concave joint 3 is provided on one side of the tip, A convex joint 4 is provided on the side.

  As shown in FIG. 2, the steel shell element 2 has an opening 24 on one side surface for removing earth and sand remaining between the side plates 22 and 22 of the adjacent steel shell elements 2 and 2 after excavation. In addition to being provided at predetermined intervals along the axial direction, preferably at a pitch of about 0.5 m, a closing plate 23 for sealing the opening 24 is provided. The closing plate 23 is fastened with a nut from the inside to a bolt projecting inward along the periphery of the opening 24 at a predetermined interval, and is attached to be removable from the inside of the element after the element is dug.

  As shown in FIG. 3, the joint structure 1 is a joint structure when the steel shell elements 2 are sequentially connected to the penetrated steel shell elements 2, and is provided in one adjacent steel shell element 2. It consists of a connection structure between the concave joint 3 and the convex joint 4 provided on the other steel shell element 2.

  As shown in FIG. 4, the concave joint 3 extends along the axial direction of the steel shell element 2, and has a groove portion 5 that opens toward the adjacent steel shell element 2, and a water stop that closes the opening of the groove portion 5. A portion 6 and locking portions 7 and 7 projecting from both sides in the groove portion 5 are provided.

  As shown in FIG. 5, the water stop portion 6 has leaf spring-like packings 8 and 8 extending toward at least the center of the opening from both sides of the opening of the groove portion 5.

  The packing 8 extends from both sides toward the center of the opening, and is formed by opposing two bent plate-like bodies having a thickness of about 0.3 mm that are bent toward the inside of the groove 5 at an intermediate position. The outer end portion is fixed to the concave joint 3 side, and the central end side is a free end, thereby acting as a leaf spring. The free ends of the packings 8 and 8 are provided so as to face each other. Since the packings 8 and 8 are bent toward the inside of the groove portion 5, when the concave joint 3 and the convex joint 4 are fitted, the packings 8 and 8 expand toward the inside of the groove portion. .

  As shown in FIG. 5, on the outer side of the packings 8, 8, leaf spring-shaped auxiliary packings 9, 9 ′ extending from both sides of the opening toward the center of the opening are provided, whereby the water stop portion 6 is preferably constituted by a double packing 10.

  As shown in FIG. 5, the packing 8 and the auxiliary packings 9 and 9 ′ are attached to the groove portion 5 on the outer side of the spacer 18 disposed between the packings and the auxiliary packings 9 and 9 ′. It is fixed by a bolt 14 through a pressed metal fitting 19. The inner side of the spacer 18 is provided so as to protrude inward from the inner side of the side wall of the groove portion 5, and preferably extends to a bending position of the packing 8 that is bent in the middle.

  The auxiliary packings 9 and 9 'are configured by opposing two plate-like bodies having a plate thickness of about 0.3 mm extending substantially linearly from both sides toward the center of the opening, and the outer end portions are recessed. It is fixed to the joint 3 side, and acts as a leaf spring when the center end side of the opening is a free end. The auxiliary packings 9, 9 'are provided so as to have an overlap margin at the center of the opening. Of the auxiliary packings 9 and 9 ′, one auxiliary packing 9 arranged outside in the overlap margin is formed longer outside the other auxiliary packing 9 ′ arranged inside in the overlap margin, The free end of the auxiliary packing 9 is supported by the spacer 18 fixed to the opposite side wall, and the pressure resistance from the outside is improved.

  On the other hand, the other auxiliary packing 9 ′ arranged on the inner side in the overlap margin is formed shorter than the one auxiliary packing 9, and preferably formed to a position slightly beyond the center of the opening. When it is inserted, it interferes with the outer auxiliary packing 9 to prevent it from becoming unexpandable.

  As shown in FIG. 5, it is desirable to fill a waterstop material 11 between the double packing 10 composed of the packings 8 and 8 and the auxiliary packings 9 and 9 ′.

  As the waterstop lubricant 11, it is preferable to use an oil-based waterstop lubricant with high durability against high water pressure, and in particular, to prevent the ingress of groundwater or backing material between the wire brushes of the shield machine. The tail sealer (registered trademark, manufactured by Matsumura Petroleum Chemical Co., Ltd.) to be used is suitable. The waterstop lubricant 11 functions as a lubricant when the protrusion 12 is inserted when the concave joint 3 and the convex joint 4 are fitted, and functions as a waterstop after completion of the fitting. is there.

  The concave joint 3 includes a structure portion 3A having the locking portions 7 and 7 and a side wall portion 3B made of a flat bar having a predetermined thickness fixed on both sides of the opening side end of the structure portion 3A. A divided structure composed of 3B is preferable. The side wall portion 3B is fixed to the structure portion 3A side by a plurality of bolts 14, 14... That are attached to the water stop portion 6 at intervals along the longitudinal direction of the member. The water stop portion 6 is provided at the opening side end portions of the side wall portions 3B and 3B. By making the concave joint 3 a split structure, the structure portion 3A can take on a force such as a tensile force acting on the joint structure. In addition to the structure 3A, the side wall 3B is structured to be fixed by the bolts 14 for fixing the packings 8 and 8 and the auxiliary packings 9 and 9 'of the water stop part 6, so that the water stop part 6 can be attached. Will be improved.

  The structural portion 3A is preferably made of cast metal or hot stamped steel. By constituting the casting or hot stamped steel, the proof strength of the concave joint 3 is improved, and a divided structure consisting of the structural part 3A and the side wall parts 3B and 3B is used, and the casting part or hot stamping is expensive. By using only the structural part 3A as the mold steel part and using a standard flat bar or the like for the side wall part 3B, the manufacturing cost can be reduced and the manufacturability can be improved.

  On the other hand, as shown in FIG. 3, the convex joint 4 includes a flat protrusion 12 inserted into the groove 5 from the opening of the groove 5, and the tip of the protrusion 12 has the Protrusions 13 and 13 projecting on both sides so as to be engaged with the engaging portions 7 and 7 formed in the groove 5 are provided.

  As shown in FIG. 3, when the concave joint 3 and the convex joint 4 are fitted, the protrusion 12 of the convex joint 4 is deformed so as to expand the packings 8 and 8 and the auxiliary packings 9 and 9 ′, respectively. And inserted between the packings 10 on both sides. In the state in which the protruding portion 12 is inserted, as shown in FIG. 3, the packings 8 and 8 and the auxiliary packings 9 and 9 ′ on both sides are pressed against the protruding portion 12 by the spring action while expanding. ing. In this way, unlike the conventional structure in which the water-stopping rubber protruding from the both side walls contacts the water-stopping structure, the expanded leaf spring-shaped packings 8 and 8 and the auxiliary packings 9 and 9 ′ are pressed against each other. Since the water is stopped by doing so, the absorption of the construction error of the ridge portion 12 (convex joint 4) is increased, and water stoppage can be secured more reliably.

  After fitting the concave joint 3 and the convex joint 4, a grout material 15 (see FIG. 9) is filled in the groove 5 of the concave joint 3 and between the convex joint 4 and the concave joint 3. 3 and the convex joint 4 are integrated. As the grout material 15, concrete, mortar, or the like is used, and a material having good fluidity and no shrinkage is preferable. As a result, force can be transmitted between the adjacent steel shell elements 2 and 2.

  Next, the construction procedure of the steel shell element provided with the joint structure 1 will be described. As shown in FIG. 6, the steel shell element 2 is penetrated in advance so that the concave joint 3 side preferably precedes. At this time, since the concave joint 3 is provided with the water stop portion 6, it can be penetrated into the groove portion 5 without inflow of natural earth and sand, a backing material or the like.

  Subsequently, as shown in FIG. 7, the succeeding steel shell element 2 is inserted while the succeeding convex joint 4 is fitted to the concave joint 3 of the preceding steel shell element 2.

  After that, as shown in FIG. 8, the natural ground remaining between the side plate 22 of the preceding steel shell element 2 and the side plate 22 of the subsequent steel shell element 2 is closed with the opening 24 provided in the side plate 22. The closing plate 23 is removed and removed from the opening 24.

  And as FIG. 9 shows, after cleaning the inside of the groove part 5 of the concave joint 3 with which the convex joint 4 was fitted with high pressure washing water etc. as needed, grout materials 15, such as high-strength mortar, were put in the groove part 5. Fill.

  This operation is sequentially repeated. After that, as shown in FIG. 10, concrete is placed in the steel shell element 2 to complete the outer shell structural member. By placing concrete in the steel shell element 2, tensile stress acts on the joint structure 1.

  As shown in FIG. 11, a plurality of bolts 16, 16... For preventing separation of both side walls are connected along the longitudinal direction of the member of the concave joint 3 so as to connect both side walls of the groove portion 5. It is preferable to provide a plurality at predetermined intervals. By providing the bolt 16, even if a tensile stress is applied when the concave joint 3 and the convex joint 4 are fitted, the side walls of the concave joint 3 can be prevented from expanding and opening, and the groove 5 Thus, the state in which the grout material 15 is filled can be reliably maintained, and the rigidity of the joint structure 1 can be increased.

  The bolt 16 is inserted and fixed from the inside of the steel shell element 2 after removing the earth and sand remaining between the side plates 22 and 22 in the manner of construction of the steel shell element 2 described above. The hole provided in the concave joint 3 for inserting the bolt 16 can also be used as an injection port for cleaning the inside of the groove portion 5 with high-pressure cleaning water or the like.

  Corresponding to the installation position of the bolt 16, an opening 17 is provided in the protrusion 12 of the convex joint 4. The opening 17 is formed in a size of about 2 to 3 times the diameter of the bolt 16 in anticipation of the construction error of the convex joint 4. Further, the length L from the end of the structure portion 3A of the side wall portion 3B to the packing attachment position is such that the opening 17 is formed in the packing 8 even when the protrusion 12 is attached to the outermost side due to the construction error. The length is such that it does not take. Thereby, the water stop by the water stop part 6 can be ensured reliably.

[Other examples]
(1) In the above embodiment, the packing 8 has a groove portion at an intermediate position in order to suppress the amount of entry into the groove inner side when the protrusion 12 of the convex joint 4 is fitted to the concave joint 3. 5 is a bent plate-like body that is bent toward the inside, and the free ends are abutted against each other. However, it is also possible to make a flat-plate-like packing like the auxiliary packings 9 and 9 ′.

  DESCRIPTION OF SYMBOLS 1 ... Joint structure, 2 ... Steel shell element, 3 ... Concave joint, 4 ... Convex joint, 5 ... Groove part, 6 ... Water stop part, 7 ... Locking part, 8 ... Packing, 9 * 9 '... Auxiliary packing, 10 ... Double packing, 11 ... Waterstop lubricant, 12 ... Projection, 13 ... Projection

Claims (11)

A steel shell element joint structure for constructing an underground structure by sequentially penetrating steel shell elements while being connected to the penetrated steel shell elements,
The joint structure is provided in one adjacent steel shell element, and has a groove joint that opens along the axial direction of the steel shell element, a concave joint including a water stop portion that closes the opening of the groove portion, and the other steel shell. It is provided with an element, and consists of a convex joint provided with a protrusion that is inserted into the opening of the groove,
The water stop portion has a leaf spring-shaped packing extending from both sides of the opening toward the center of the opening, and the protruding portion expands the packing when the concave joint and the convex joint are fitted. The steel shell element joint structure is inserted between the packings on both sides while being deformed as described above.   The joint structure of a steel shell element according to claim 1, wherein each of the packings is bent toward the inside of the groove and the ends are abutted against each other.   The water stop portion includes a double packing including the packing and a leaf spring-shaped auxiliary packing provided on the outside of the packing and extending from both sides of the opening toward the center of the opening. The packings are provided so as to have an overlap margin at the center of the opening, and when the concave joint and the convex joint are fitted, the ribs are deformed so as to expand the packing and the auxiliary packing, respectively. The joint structure of a steel shell element according to any one of claims 1 and 2, which is fitted between the packings.   4. The steel shell element joint structure according to claim 3, wherein the water stop portion has a water stop sliding material filled between the double packings.   The concave joint has a locking part protruding from both sides in the groove part, and the convex joint has a projection part that locks the locking part at a tip of the protruding part. The joint structure of the steel shell element in any one of 1-4.   The steel shell element according to any one of claims 1 to 5, wherein a grout material is filled in a gap between the concave joint and the convex joint after the concave joint and the convex joint are fitted, and the concave joint and the convex joint are integrated. Joint structure.   The concave joint has a divided structure composed of a structure part having a locking part protruding from both sides in the groove part, and a side wall part fixed to both sides of the opening side end part of the structure part to which the packing is attached. The joint structure of steel shell elements according to any one of claims 1 to 6.   The joint structure of a steel shell element according to claim 7, wherein the structural portion is made of cast metal or hot stamped steel.   The steel shell element joint structure according to any one of claims 7 and 8, wherein the structural part and the side wall part are connected by a bolt.   The joint structure of a steel shell element according to any one of claims 1 to 9, wherein the concave joint and the convex joint are respectively connected to members extending from an outer end portion and an inner end portion of the steel shell element.   The joint structure for steel shell elements according to any one of claims 1 to 10, wherein a bolt for preventing expansion between both side walls is provided so as to connect both side walls of the groove portion.

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