JP6474653B2 - Connection structure for new and existing underground structures - Google Patents

Description

  The present invention relates to a connection structure for new and existing underground structures.

  Conventionally, when the excavation tunnel is widened, there are many cases where the existing housing is connected by opening a part of the existing housing.

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  However, in the case of the lap joint of the conventional structure (1) shown in FIG. 3 (a), in terms of workability and construction period, it is necessary to hang up the reinforcing bars and temporarily receive the existing frame, and the construction period becomes long. In terms of the impact on the existing chassis, the increase in the cross-sectional force of the existing chassis is moderate, and in terms of the impact on the passengers, the passage is occupied and necessary (large) for provisional reception, and cost comparison (comprehensive evaluation) Then, Δ.

  In the case of the horizontal anchor of the conventional structure (2) shown in FIG. 3 (b), in terms of workability and construction period, it is not necessary to hang up the reinforcing bar, and a temporary support of the existing frame is required, and the construction period is slightly longer. In terms of the impact on the existing chassis, the increase in the cross-sectional force of the existing chassis is large, and in terms of the impact on the passenger, the passage is occupied and necessary (large to medium) for provisional reception, and cost comparison (comprehensive evaluation ), There was a problem of △.

  In view of the above situation, the present invention has a short construction period, a small increase in the cross-sectional force of the existing frame, and a cost reduction that does not require occupation of a passage for temporary support, and a connection structure for newly installed and existing underground structures The purpose is to provide.

In order to achieve the above object, the present invention provides
[1] In the connection structure between the new and existing underground structure , the existing underground structure (1) and the newly installed and existing underground structure (1) are connected to the connection (3) between the new and existing underground structure (2). The horizontal anchor (4 ) that connects the existing underground structure (2), the existing underground structure (1), and the vertical anchor (5) that connects the new and existing underground structure (2) are arranged in a cross shape. The vertical anchor (5) protruding upward from the object (1) is received by the new vertical beam (6) which is a reverse beam, and the existing underground structure (1) is received by the new vertical beam (6) which is a reverse beam. It is configured to embrace, and this configuration is applied to the expansion work of the open tunnel.

[2] In the connection structure of the new and existing underground structures described in [1] above, the new and old underground underground in the crossing direction of the track due to the effect of the new vertical beam (6) which is a reverse beam in the track direction. It is characterized by suppressing an increase in the cross-sectional force of the existing underground structure by the structure being integrated and resisting.

  According to the present invention, the construction period is short, the increase in the cross-sectional force of the existing housing is small, and the cost can be reduced without occupying the passage for temporary reception.

It is a schematic diagram of the connection structure of the new and existing underground structure which shows the Example of this invention. It is the schematic diagram of the widening construction which contrasted the prior art and the Example of this invention. It is a figure which shows the comparison of the connection structure of the new installation and existing underground structure of the conventional widening work, and the connection structure of the new installation and existing underground structure of the widening construction of this invention. It is a construction process figure of the widening construction of this invention. It is a detailed schematic diagram of the anchor joint of the widening construction of this invention. It is a figure which shows the mode of the bending loading test of the anchor joint of the widening construction of this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of a connection structure of a newly installed / existing underground structure showing an embodiment of the present invention, FIG. 2 is a schematic diagram of widening work comparing the conventional embodiment with the embodiment of the present invention, and FIG. FIG. 2B is a drawing substitute photograph of the widening work of the present invention, and FIG. 2B is a drawing substitute photograph of the widening work of the present invention.

In these drawings, 1 is an existing underground structure, 2 is a new / existing underground structure, and a connecting portion 3 between the existing underground structure 1 and the new / existing underground structure 2 is a cross formed by a horizontal anchor 4 and a vertical anchor 5. And is received by the newly installed vertical beam 6 which is a reverse beam .

  FIG. 3 is a diagram showing a comparison between a connection structure of a conventional widening work and a connection structure of an existing underground structure and a connection structure of a new widening work and an existing underground structure of the present invention.

  The connection structure of a newly established / existing underground structure in the conventional widening construction has the problems as shown in FIGS. 3 (a) and 3 (b), whereas according to the present invention, FIG. 3 (c) As shown in Fig. 5, in terms of workability and construction period, it is not necessary to hang up the reinforcing bars or temporarily receive the existing frame, which shortens the construction period. In terms of the impact on the existing housing, the increase in the cross-sectional force of the existing housing is small, and in terms of the impact on the passenger, it is not necessary to occupy the passage for temporary reception. The cost can be reduced to some extent.

  FIG. 4 is a construction process diagram of the widening work of the present invention.

  This will be described with reference to FIG.

  Step S1: (1) pile driving (night), (2) lining (night), (3) excavation, (4) earth retaining support. Here, 11 is an intermediate support pile, and 12 is a soil retaining support.

  Step S2: (1) Anchor work is performed. Here, 13 is an anchor work.

  Step S3: (1) Construction of a new frame, (2) Backfilling, (3) Replacement of cut beams. Here, 14 is the construction of a newly-built frame, 15 is backfilling, and 16 is replacement of cut beams.

  Step S4: (1) Temporary fence installation, (2) Support installation, (3) Partial removal of existing side wall. Here, 17 is temporary enclosure installation, 18 is support installation, 19 is the partial removal work of the existing side wall, and 20 is core drilling.

  Step S5: (1) The main column and foundation are installed. Here, 21 is the main column / foundation installation, and there is no upper-floor plate receiver H steel.

  Step S6: (1) Perform backfilling.

  FIG. 5 is a detailed schematic diagram of an anchor joint for widening work according to the present invention, and FIG. 6 is a diagram showing a bending load test of the anchor joint.

  In these drawings, the horizontal anchor bars 23 are arranged near the center of the existing side member 22. Protruding portions 25, reinforcing reinforcing bars 26, and vertical anchor bars 27 are arranged on the new-side longitudinal beam (reverse beam) 24.

  Therefore, as shown in FIG. 6, a bending load test of the newly installed vertical beam (reverse beam) 24 is performed.

  Thus, according to the anchor joint of the present invention, a bending load test is possible even when there is no existing reinforcing bar to be joined, as compared with the conventional lap joint. In addition, it is not necessary to lift the reinforcing bars.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The new / existing underground structure connecting structure of the present invention has a short construction period, a small increase in the cross-sectional force of the existing frame, and can reduce costs without the need to occupy a passage for temporary support. It can be used as an object connection structure.

DESCRIPTION OF SYMBOLS 1 Existing underground structure 2 New and existing underground structure 3 Connection part of existing underground structure and new and existing underground structure 4 Horizontal anchor 5 Vertical anchor 6 New side vertical beam 11 which is a reverse beam Intermediate support pile 12 Retaining retaining Construction 13 Anchor construction 14 Construction of new frame 15 Backfilling 16 Replacement of cut beam 17 Temporary enclosure installation 18 Support installation 19 Partial removal of existing side wall 20 Core drilling 21 Main pillar / foundation installation 22 Existing side member 23 Horizontal anchor reinforcement 24 New installation Side longitudinal beam (reverse beam)
25 Protrusions 26 Reinforcement bars 27 Vertical anchor bars

Claims (2)

Horizontal anchor (4 ) connecting the existing underground structure (1) and the new / existing underground structure (2) to the connection (3) between the existing underground structure (1) and the new / existing underground structure (2) ) and existing underground construction (1) and the newly-existing underground construction (vertical anchor (5) connecting the 2) arranged in a cross, a vertical anchor projecting existing underground structures from (1) above (5) Is received by the new vertical beam (6) , which is the reverse beam, and the existing underground structure (1) is held by the new vertical beam (6) , which is the reverse beam. Connection structure for new and existing underground structures characterized by application to expansion work. In the connection structure of new and existing underground structures according to claim 1, the old and new underground structures are integrated in the cross-track direction due to the effect of the new vertical beam (6) which is a reverse beam in the track direction. Connecting structure of new and existing underground structures characterized by suppressing the increase in cross-sectional force of existing underground structures by resisting.

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