JP6242675B2 - Supporting structure for end plate for tunnel secondary lining formwork device - Google Patents

Description

  The present invention relates to a support structure for a tunnel secondary lining formwork device, and more particularly to a support structure suitable for supporting a support plate of a telescopic tunnel secondary lining formwork device.

  A telescopic type tunnel lining formwork device (hereinafter simply referred to as a formwork device) is provided with a pair of fixed-length formwork at the front and back, and cast concrete is placed on the preceding secondary lining layer during curing. In the state where the formwork is placed, the second formwork in a contracted state is passed through the formwork, and the second formwork is enlarged and deformed to follow the preceding secondary lining layer. A concrete injection space for the lining layer is formed, and by repeating this alternately, the secondary lining layer can be efficiently formed while sufficiently curing the cast concrete.

  By the way, the concrete pouring space formed outside the mold is closed at one end by a preceding secondary lining layer and at the other end by a gable plate provided on the mold. For example, in Patent Document 1, the end plate is coupled to the end surface of the mold by bolts.

  In this case, as in the apparatus of the above publication, the bolt connection fixes only the base end (inner peripheral edge) of the end plate to the formwork, while the pressure of the cast concrete is equally applied to the outer periphery of the end plate. In some cases, the end plate is strengthened by striking and abutting a rod-shaped support member from the mold side toward the outer peripheral portion of the end plate.

JP2004-300893

  However, in the telescopic mold apparatus, since the secondary lining work proceeds in a state where the end faces of the pair of mold frames are in contact with each other, when the rod-shaped support member is leaned from the mold side, the lower end of the support member If the receiving part protrudes from the end face of the mold, there is a problem that the end faces of the mold cannot be brought into contact with each other without a gap.

  Accordingly, the present invention solves such a problem, and in a telescopic mold apparatus, a tunnel secondary lining mold that can increase the strength of the end plate by providing a bar-like support member that supports the back. It is an object of the present invention to provide a support structure for a frame plate.

  In order to achieve the above object, according to the first aspect of the present invention, the inner peripheral portion is fixed to the tunnel longitudinal direction end of the tunnel secondary lining form (2), and the outer periphery of the form (2) is moved outward. It is a support structure of the end plate (4) which closes the secondary lining concrete pouring space (S) formed in, and is housed in the mold (2) at the tunnel longitudinal end of the mold (2) In this state, the receiving member (3) is provided so that it can be pulled out outward in the longitudinal direction of the tunnel, and a contact portion (32) is provided at the drawing end (311) of the receiving member (3). The lower end of the bar-like support member (5) is brought into contact with the upper end of the support member (5) inclined obliquely upward toward the end plate (4) to the outer peripheral portion of the outer surface of the end plate (4) It was made to be characterized.

  In the first invention, in the telescopic mold apparatus, if the receiving member in one mold having the preceding secondary lining layer is stored, the end face of the other mold is connected to the receiving member. It can be connected to the end face of the one mold without interference. And when forming a new secondary lining layer following the preceding secondary lining layer with the other mold, the inner periphery of the end plate is fixed to the end of the other mold and the receiving member is By pulling out a rod-shaped support member between the drawer end of the receiving member and the outer peripheral portion of the outer surface of the end plate, the strength of the end plate is increased.

  In the second invention, the receiving member (3) includes a rod-like slide body (31), and guide portions (211 and 212) are provided on flange portions formed on the outer peripheral portion in the mold (2). The slide body (31) is supported so as to be movable in the longitudinal direction of the tunnel, and the abutting portion (32) is provided at the drawer end (311) of the slide body (31).

  According to the second invention, the receiving member can be realized with a simple structure.

  The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

  As described above, according to the support structure of the frame plate of the tunnel secondary lining form apparatus of the present invention, in the telescopic type frame apparatus, the strength of the frame plate can be increased by providing the bar-shaped support member that supports the back. Can be planned.

It is a whole front view of a telescopic type formwork device provided with a end plate support structure. It is an edge part expanded sectional view of a telescopic type | mold formwork apparatus provided with a end plate support structure. It is sectional drawing of the frame outer peripheral part which shows the action | operation of a telescopic type | mold formwork apparatus provided with a faceplate support structure. It is an edge part expanded sectional view which shows the action | operation of a telescopic type | mold formwork apparatus provided with a faceplate support structure.

  FIG. 1 shows a front view of a telescopic formwork apparatus provided with the support plate support structure of the present invention. The formwork apparatus includes a portal gantry 1, and the gantry 1 can move on the traveling rail 11 in the longitudinal direction of the tunnel (perpendicular to the paper surface). A main cylinder 12 is provided in a standing posture in the left and right leg portions of the gantry 1, and a horizontal beam 13 is supported by the left and right main cylinders 12 so as to be movable up and down. A main beam 14 is provided in a standing position on the left and right positions on the beam 13, and the main frame 14 supports the mold 2 whose diameter is expanded in an arch shape as a whole. FIG. 1 shows a state where the main cylinder 12 is extended to raise the beam 13 and an arc-shaped secondary lining concrete injection space S is formed between the outer peripheral surface of the mold 2 and the inner wall of the tunnel T. .

  The formwork 2 has a top form 21 supported directly on the lower surface by the main beam 14, a side form 22 hinged to the left and right ends of the top form 21, and a bottom form of the side form 22. It is comprised from the invert form 23 hingedly connected. Each of these foams 21 to 23 has a known structure as shown in FIG. 1 by a bar jack 24 provided at each hinge connecting portion, a bar jack 25 to 27 installed between each of the foams 21 to 23 and the gantry 1, and the like. Is maintained in an expanded state.

  Here, in the present embodiment, a receiving member 3, which will be described in detail below, is provided on one end surface of the mold 2 in the tunnel longitudinal direction. Details of the receiving member 3 are shown in FIG. The receiving member 3 includes a rod-shaped slide body 31 having a square cross section. On the other hand, cylindrical guide openings 211 and 212 as guide portions are provided at the end portion of the mold 2 on the outer peripheral flange portion of the top end form 21 connected in the tunnel longitudinal direction to form the mold 2. The slide body 31 is inserted and accommodated in the guide openings 211 and 212 so as to be movable in the tunnel longitudinal direction. A tip portion 311 of each slide body 31 protruding from the end surface of the mold 2 is stepped and recessed in the thickness direction. A stopper portion 312 having a diameter larger than that of the guide openings 211 and 212 is formed at the rear end of the slide body 31. The guide openings 211 and 212 may be separated from each other and may be formed as a continuous long integral cylindrical body. Further, instead of forming the guide openings 211 and 212 through the plate surface of the outer peripheral flange portion, a cylindrical body may be joined to the inner peripheral edge of the outer peripheral flange portion to form the guide opening. Note that the guide portion does not necessarily have a cylindrical shape, and need not be realized with an opening.

  A plurality of slide bodies 31 having the same structure are provided on the top end form 21, the side form 22, and the invert form 23 (FIG. 1), and H-shaped steel is used between the tip portions 311 of each pair of adjacent slide bodies 31. Each abutting portion 32 (FIG. 2) is constructed to constitute each receiving member 3. Here, the abutment portion 32 is not necessarily formed of a steel material that is a separate member from the slide body 31, and may be realized by forming a part of the slide body 31. In the state in which the slide body 31 is stored, a collar portion 28 (FIG. 2) is formed to project from the end surface of the mold 2 so as to cover the contact portion 32 on the tip portion 311 from the outside in the radial direction. The outer peripheral surface of the mold 2 is flush with the outer peripheral surface of the general part of the mold 2. In the telescopic formwork apparatus of this embodiment, a pair of formwork 2 having the above structure is provided in the tunnel longitudinal direction.

  Hereinafter, the case where a secondary lining work is performed with the formwork apparatus of the present embodiment will be described. The gantry 1 supports one of the pair of molds (hereinafter referred to as the first mold) 2A as described above, and in this state, the first mold 2A is developed and the secondary lining concrete is placed in the injection space S. It is injected and its curing is started (FIG. 3). Thereafter, the main cylinder 12 (FIG. 1) is contracted to lower the base beam 13, and the connection of the bar jacks 25 to 27 installed between the gantry 1 and the foams 21 to 23 is canceled. The connected state of the 1 mold 2A is eliminated.

  Thereafter, the gantry 1 is moved through the first mold 2 </ b> A to the inside of another mold (hereinafter referred to as the second mold) forming the preceding secondary lining layer. Then, the main cylinder 12 is extended to support the second formwork with the gantry 1, and both side forms of the gantry 1 and the second formwork are connected with the hydraulic cylinder and the connection of the jack jack of the hinge portion is canceled. Then, the diameter of the second mold is reduced with a known structure, and the second mold is separated from the preceding secondary lining layer after curing. Then, the second mold 2B (FIG. 3) in a reduced diameter state supported on the gantry 1 is pulled out through the first mold 2A to the opposite side. This state is shown in FIG.

  Subsequently, in order to form a new secondary lining layer continuous with the secondary lining layer formed in the injection space S outside the first mold 2A, the diameter of the second mold 2B is expanded. Then, a secondary lining concrete pouring space S is formed between the outer periphery and the tunnel inner wall (a chain line in FIG. 3). At this time, since the receiving member 3 of the first mold 2A is pushed into and stored in the end of the mold 2A, the receiving member 3 does not interfere with one end surface of the second mold 2B whose diameter has been expanded.

  Subsequently, in order to close the injection space S formed on the outer periphery of the second mold 2B, the end plate 4 is attached to the other end face of the second mold 2B (FIG. 4). As shown in FIG. 4, the inner periphery of the end plate 4 is fixed to the end face of the flange portion 28 of the second mold 2B. The outer peripheral surface of the end plate 4 extends to and contacts the inner wall of the tunnel T, whereby the injection space S is closed. Here, in this embodiment, the receiving member 3 housed in the end portion of the second mold 2B is moved outward in the tunnel longitudinal direction until the stopper portion 312 comes into contact with the peripheral edge of the guide opening 212 as shown in FIG. Pull out towards. With the receiving member 3 pulled out, positioning bolts 213 provided on the cylindrical walls of the guide openings 211 and 212 are advanced to the side surfaces of the slide body 31 to position them. The positioning bolt 213 is not particularly required to be provided.

  In this state, the lower end and the upper end of the rod-like support member 5, for example, a wooden column body, are provided between the contact portion 32 provided on the leading end portion 311 pulled out of the slide body 31 and the outer peripheral portion outer surface of the end plate 4. Are provided so as to be inclined obliquely upward toward the end plate 4. A required number of such support members 5 are installed on the entire circumference of the end surface of the frame body 2 using the receiving members 3 provided on the respective foams 21 to 23 (FIG. 1). As a result, in addition to the fixed inner peripheral edge, the outer peripheral portion of the end plate 4 is supported from the back, so that the end plate 4 has sufficient strength to withstand the pressure of the poured concrete.

  2, 2A, 2B ... formwork, 211, 212 ... guide opening (guide part), 3 ... receiving member, 31 ... slide body, 311 ... drawer end, 32 ... abutting part, 4 ... end plate, 5 ... support member, S: Secondary lining concrete injection space.

Claims (2)

It is a support structure for a girder that has an inner periphery fixed to the tunnel longitudinal end of the tunnel secondary lining formwork and closes the secondary lining concrete injection space formed outside the outer periphery of the formwork. A receiving member is provided at the tunnel longitudinal end of the mold so that it can be pulled out from the state housed in the mold in the tunnel longitudinal direction, and a contact portion is provided at the drawer end of the receiving member. The tunnel 2 is characterized in that the lower end of the rod-shaped support member is brought into contact with the contact portion, and the upper end of the support member inclined obliquely upward toward the end plate is brought into contact with the outer peripheral portion of the outer surface of the end plate. Support structure for the next lining formwork. The receiving member includes a rod-shaped slide body, a guide portion is provided on a flange portion formed on the outer peripheral portion in the mold, and the slide body is supported so as to be movable in the tunnel longitudinal direction, and the slide body is pulled out. The support structure of the end plate of the tunnel secondary lining formwork according to claim 1, wherein the contact portion is provided at an end.

Images