JP4438627B2 - Joining method of mounting plate of flexible joint - Google Patents

Description

  The present invention relates to a method for joining a mounting plate of a flexible joint, and more particularly, to a flexible joint disposed by joining a divided body along a circumferential direction to opposing end surfaces of connected underground structures. The present invention relates to a method for joining a mounting plate of a flexible joint that can securely and easily join a mounting plate while ensuring water tightness.

  Conventionally, as shown in FIG. 1, the underground structure 13 such as a common groove for laying a communication cable, a gas pipe, a water pipe or the like, an underground passage, and the like is attached to the mounting plate 2 in which opposing end faces are arranged in the circumferential direction of the end faces. Are connected using a flexible joint 1 having With this flexible joint 1, it is possible to absorb displacement caused by expansion and contraction due to temperature changes acting on the underground structure 13, ground subsidence, earthquakes, and the like, and the structure is connected with water tightness.

  When the underground structure 13 becomes large, the mounting plate 2 also becomes large. Due to restrictions on transportation and construction space, for example, the divided structures 2a to 2d divided into four parts are divided into the underground structure 13 as shown in FIG. As a structure to be joined at the joining portion S along the circumferential direction of the opposing end surfaces, the assembly is performed at the construction site (see, for example, Patent Document 1). In Patent Document 1, the divided bodies are fastened and joined with fastening bolts in the circumferential direction via connecting fittings.

  Moreover, the structure of another flexible joint is shown in FIGS. 6 is a longitudinal sectional view corresponding to the AA section in FIG. 1, and FIG. 7 is a view taken in the direction of arrow C in FIG. In the longitudinal cross section shown in FIG. 6, the mounting plate 2 is provided on each opposing end surface of the underground structure 13 to be connected, and the elastic rubber 4 is attached to the inner peripheral surface of the mounting plate 2 via the presser fitting 5 and the anchor 6. It fixes with the fixing volt | bolt 7 which has, and connects the end surfaces which the underground structures 13 and 13 oppose.

  At this time, as shown in FIG. 7, the divided bodies 2a and 2b joined along the circumferential direction to the opposing end surfaces of the underground structures 13 and 13 are formed with a circumferential joint surface in a flange shape, The flange-like portions 3a and 3b are brought into contact with each other, and a nut 11 is screwed into a fastening bolt 10 inserted through a through hole provided in the flange-like portions 3a and 3b.

  In the conventional joining method of the mounting plate 2 as described above, in order to ensure watertightness, in addition to joining with the fastening bolt 10 and the nut 11, the joint and flange of the joining surfaces of the flange-like portions 3 a and 3 b It was necessary to perform watertight welding of the contact seams between the parts 3a and 3b, the fastening bolt 10 and the nut 11.

However, the contact seams between the flange-like portions 3a and 3b, the fastening bolts 10 and the nuts 11 are complicated in shape, so that a high welding technique is required and it is difficult to ensure water tightness. Moreover, since much time was required for welding, there was a problem that construction efficiency was bad.
JP-A-8-284186

  It is an object of the present invention to ensure a watertight property of a flexible joint mounting plate disposed by joining a divided body along a circumferential direction to opposite end surfaces of connected underground structures. It is an object of the present invention to provide a method of joining a mounting plate of a flexible joint that can be joined together.

  In order to achieve the above object, the method for joining the mounting plates of the flexible joint of the present invention is arranged by joining a plurality of divided bodies along the circumferential direction of each end face of each of the connected underground structures. In the joining method of the mounting plate of the flexible joint, each of the divided bodies has a joining surface to be joined formed in a flange shape, and has a through hole in the flange-like portion that communicates when joined. The flange-shaped parts of the divided bodies to be joined are brought into contact with each other, a fastening bolt is inserted into the through hole, a fastening nut is screwed and fastened and joined, and a seam of the joining surface is watertight welded, the watertight welding The fastening bolt and nut are removed later, and a round bar is inserted into the through hole, and the gap between the round bar and the through hole is watertight welded.

  According to the flexible joint mounting plate joining method of the present invention, a plurality of divided bodies are joined to the opposing end faces of the underground structures to be connected along the circumferential direction of the end face. In the joining method of the joint mounting plate, each divided body has a flange-shaped joint surface to be joined, and has a through hole in the flange-like portion that communicates when joined. It is possible to adjust the attachment position and the removal of the attachment distortion by so-called temporary joining by bringing the fastening bolts into contact with each other and inserting the fastening bolts into the through holes and screwing and fastening the fastening nuts.

  In this fastened and joined state, the joint of the joint surfaces is watertight welded to ensure watertightness and join. In addition, the fastening bolt and nut are removed after this watertight welding, and a round bar is inserted into the through hole, and the gap between this round bar and the through hole is watertight welded, so the shape is complex and watertightness can be ensured. Using a round bar with a simpler shape than the abutting seam between the fastening bolt and nut and the flange-shaped part, which is difficult and time consuming, makes it easier to ensure watertightness, shortening work time, and improving work efficiency It becomes possible to make it.

  Hereinafter, the joining method of the attachment plate of the flexible joint of the present invention will be described based on the embodiments shown in the drawings. In addition, the same code | symbol is attached | subjected to the same component as a prior art example.

  FIG. 2 shows a state in which the flexible joint 1 of this embodiment connects end surfaces of the cylindrical underground structures to be connected. The flexible joint 1 includes a mounting plate 2 and a stretchable rubber 4. The mounting plate 2 is fixed to each facing end surface of the connected underground structure 13, and a joint material 8 is sandwiched between the flexible joint 1. The elastic rubber 4 is fixed to the inner peripheral surface of the mounting plate 2 with a fixing bolt 7 having an anchor 6 through a presser fitting 5 so that the opposing end surfaces of the underground structures 13 and 13 are connected to each other.

  With this connection structure, the elastic rubber 4 can absorb displacement caused by expansion and contraction due to temperature changes, ground subsidence, earthquakes and the like acting on the underground structure 13, and the water tightness is maintained.

  When the underground structure 13 is increased in size, as shown in FIG. 1, the attachment body 2 is composed of divided bodies 2 a to 2 d, and is annularly formed on the opposing end surfaces of the underground structure 13 along the circumferential direction of the end surfaces. It comes to be joined. Therefore, in order to ensure water tightness, water tightness is also required for joining of the divided bodies 2a to 2d. In addition, the number of the division bodies 2a-2d is suitably determined according to the magnitude | size etc. of the underground structure 13.

  In the present invention, as shown in the embodiment in FIGS. 3 and 4, the divided bodies 2 a and 2 b are joined. Each division body 2a, 2b forms the joint surface of the circumferential direction in the flange shape, and has flange-shaped part 3a, 3b. The flange-like portions 3a and 3b are provided with through-holes 9 and 9. When the flange-like portions 3a and 3b are brought into contact with each other in order to join the divided bodies 2a and 2b, the through-holes 9 and 9 are connected to each other. It comes to communicate.

  Hereinafter, a method of joining the divided bodies 2a and 2b in the circumferential direction and disposing the mounting plate 2 on the opposing end surfaces of the underground structure 13 will be described. First, the flanges 3a and 3b of the divided bodies 2a and 2b that are joined to each other are brought into contact with each other so that the through holes 9 and 9 communicate with each other. Here, the fastening bolt 10 is inserted into the through holes 9 and 9 and the fastening nut 11 is screwed to fasten and join the divided bodies 2a and 2b. This is not a final bonding but a temporary bonding state.

  Accordingly, when the concrete of the underground structure 13 is placed and the attachment plate 2 is sequentially fixed to the opposing end surfaces of the underground structure 13 and joined in the circumferential direction, the attachment position and the attachment distortion It is possible to make adjustments such as removal. This makes it easy to ensure water tightness.

  In this temporarily joined state, the joint surfaces of the divided bodies 2a and 2b, that is, the joints of the peripheral portions of the flange-like portions 3a and 3b are watertight welded. With this watertight welding, the watertightness of the joint surfaces of the divided bodies 2a and 2b is ensured.

  Next, the fastening bolt 10 and the nut 11 are removed. Then, as shown in FIG. 4, a round bar 12 having the same diameter as that of the through hole 9 is inserted into the through hole 9 so that the gap between the outer peripheral surface of the round bar 12 and the inner peripheral surface of the through hole 9 is filled. , Watertight welding.

  In this embodiment, the round bar 12 has a length protruding from both flange-like parts 3a and 3b, and the gap between the outer peripheral surface of the round bar 12 and the inner peripheral surface of the through hole 9 is a fillet welded part. Watertightness is maintained by W, and the divided bodies 2a and 2b are joined together while maintaining watertightness.

  This gap is not as complicated as the contact seam between the fastening bolt 10 or the nut 11 and the flange-like portions 3a and 3b, and has a simple shape. Therefore, water-tight welding is easy and water-tightness is easily secured, and the working time is reduced. However, since it is sufficient in a short time, work efficiency can be improved.

  By joining all the divided bodies in this procedure, the opposite end portions of the underground structure 13 can be connected while securing water tightness.

  FIG. 5 is a cross-sectional view showing another example of a state in which the round bar 12 is inserted into the through hole 9 and is watertightly welded. The round bar 12 has a length equal to or less than the total thickness of both flange-like portions 3a and 3b joined, and has a groove of about 2C to 3C at both ends, for example.

  Then, both ends of the round bar 12 are arranged so as not to protrude from both flange-like portions 3a and 3b, and the gap between the groove at both ends and the inner peripheral surface of the through hole 9 is watertight welded. Sex is secured. By making the round bar 12 into this shape, watertight welding can be performed more reliably and easily.

  The round bar may be a solid round bar or a hollow round bar. The cross section is not strictly circular, and may be substantially circular or small irregularities, and these also mean round bars.

It is a front view which illustrates the end surface of the underground structure to which the flexible joint is attached. It is AA sectional drawing of FIG. FIG. 3 is a view taken in the direction of arrow B in FIG. 2 (a state in which flange-like portions are temporarily fixed with fastening bolts and nuts). In FIG. 3, after the joint of the joint surface is water-tight welded, it is an explanatory view showing a state where the fastening bolt and the nut are replaced with a round bar and inserted into a through hole and water-tight welded. It is sectional drawing which inserts a round bar into a through-hole, and shows the other example of the state currently watertightly welded. It is a longitudinal cross-sectional view of the conventional flexible joint (equivalent to AA cross-sectional view in FIG. 1). It is C arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible joint 2 Mounting plate 2a-2d Divided body 3, 3a, 3b Flange-shaped part 4 Elastic rubber 5 Pressing metal fitting
6 Anchor 7 Fixing bolt 8 Joint material 9 Through hole 10 Fastening bolt 11 Fastening nut 12 Round bar 13 Underground structure

Claims (2)

  In the joining method of the mounting plate of the flexible joint, which is provided by joining a plurality of divided bodies along the circumferential direction of the end surface to each facing end surface of the underground structure to be connected, each of the divided bodies is the above-mentioned A joining surface to be joined is formed in a flange shape, and a through hole communicating with the joined portion is formed in the flange-like portion, and the flange-like portions of the divided bodies to be joined are brought into contact with each other to form the through-hole. Insert the fastening bolt, screw and fasten the fastening nut, join the joint of the joint surface with watertight, remove the fastening bolt and nut after the watertight welding, and insert the round bar into the through hole A method for joining a mounting plate of a flexible joint, characterized in that a gap between the round bar and the through hole is watertightly welded.   The round bar has a length equal to or less than the total thickness of the joined flange-like portions, takes a groove at both ends, and when inserted into the through hole, the groove at the both ends and the inner peripheral surface of the through hole The joining method of the attachment board of a flexible joint of Claim 1 which water-tightly welds the clearance gap between these.

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