JP2007332656A - Structure for installing back split wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for installing a back split wall that reduces axial compression stresses and bending moments produced in the back split wall and makes the cross section of the back split wall smaller, thus permitting an economical design and efficient construction of the wall. <P>SOLUTION: The back split wall 2 is installed in a tunnel 1. A plurality of steel connecting rods 6 are provided to protrude from a ceiling portion inside the tunnel 1. Grooved parts 5 are formed in succession along the axis of the tunnel 1 at the upper end of the back split wall 2. The steel connecting rods 6 are engaged in the grooved parts 5. An elastic sealant 8 is interposed between the ceiling portion of the tunnel 1 and the upper end of the wall 2. The lower end of the wall 2 is embedded in the concrete of an invert 9 placed at the bottom of the tunnel 1. A large-diameter portion 4 is formed at the upper end of the wall 2. Grout 7 is injected into the grooved parts 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an installation structure of a split wall installed in a tunnel mainly used as a sewer, and reduces the axial compression stress and bending moment generated in the split wall, thereby reducing the cross section of the split wall, This enables economic design and efficient construction of the split wall.

  In order to divide the inside of the tunnel excavated as sewer into a plurality of water flows, a split wall (partition) may be installed in the tunnel to divide the tunnel into a plurality of spaces.

  In this case, a precast concrete plate is used for the split wall, and the upper end of the precast concrete plate protrudes from the tunnel ceiling in a conical notch formed at the upper end of the precast concrete plate, for example. It is fixed to the tunnel ceiling by a method such as fitting a steel con, and the lower end portion of the precast concrete plate is fixed by a method such as embedding in invert concrete placed at the bottom of the tunnel. . Therefore, the upper end portion and the lower end portion of the precast concrete plate are joined to the ceiling portion and the invert portion in the tunnel in a state of almost rigidity.

  By the way, it is known that an axial compression force generally acts on this type of split wall from the vertical direction, and a large water pressure acts from the side.

Japanese Patent No. 2741779 JP 2001-220996 A Japanese Patent Laid-Open No. 2-47435 JP-A-1-105833 JP 59-154296 A

  As described above, the upper and lower ends of the split wall are joined to the ceiling and the invert part in the tunnel in a nearly rigid state, so the split wall is subjected to axial compression force and lateral water pressure. Because large axial compressive stress and bending stress would be generated, it was necessary to make the cross section of the dorsal wall considerably large in preparation for this, and it was necessary to reinforce a sufficient amount of reinforcing bars .

  For this reason, the manufacturing cost of the back split wall is increased, and there is a problem that handling is large when the weight is increased and the inside of the tunnel is transferred to the installation position.

  The present invention has been made to solve the above-described problems, and reduces the member stress generated in the split wall, reducing the cross section of the member, enabling economical design and efficient construction by reducing the cross section of the split wall. The purpose is to provide an installation structure.

  The installation structure of the back split wall according to claim 1 is a installation structure of a back split wall installed in a tunnel, wherein a plurality of protrusions protruding from a ceiling portion of the tunnel are provided at an upper end portion of the back split wall. Engaged with a groove formed continuously in the axial direction of the tunnel, an elastic sealing material is interposed between the ceiling of the tunnel and the upper end of the split wall, and the lower end of the split wall is It is characterized by being embedded in invert concrete cast at the bottom of the tunnel.

  In the present invention, the upper end portion of the split wall is joined to the ceiling portion in the tunnel in a state close to a roller bearing that does not receive axial compression force, and the lower end portion is close to a pin bearing in which bending stress does not occur in the invert portion in the tunnel. By joining in a state, the axial compressive stress and bending moment generated on the split wall are reduced, thereby reducing the member cross section of the split wall, economic design of the split wall by reducing the member cross section, and further It enables weight reduction and efficient construction.

  The split wall installation structure according to claim 2 is characterized in that, in the spine wall installation structure according to claim 1, an enlarged-diameter portion is formed at an upper end portion of the spine split wall. In particular, the present invention is reinforced by providing an enlarged diameter portion in preparation for a shearing force generated at the upper end portion of the split wall.

  The back split wall installation structure according to claim 3 is characterized in that in the back split wall installation structure according to claim 1 or 2, a grout material is injected into the groove-like portion.

  The installation structure of the back split wall according to claim 4 is an installation structure of a back split wall installed in a tunnel, wherein a plurality of protrusions protruding from a ceiling portion of the tunnel are provided at an upper end portion of the back split wall. It is engaged with a groove-like part formed continuously in the axial direction of the tunnel, an elastic sealing material is interposed between the ceiling part of the tunnel and the upper end part of the split wall, and the engaging part is a roller support, And the lower end part of the said back split wall is embed | buried in the concrete of the invert casted in the bottom part of the said tunnel, and the lower end part of the back split wall becomes a pin connection, It is characterized by the above-mentioned.

  In the present invention, the upper end portion of the split wall is joined to the ceiling portion in the tunnel in a state close to a roller bearing that is not subjected to axial compression, and the lower end portion is in a state close to a pin bearing in which bending stress does not occur in the invert portion in the tunnel. By being joined, axial compression stress and bending moment generated on the split wall can be reduced. This makes it possible to reduce the cross section of the split wall, economical design and light weight of the split wall by reducing the cross section of the member. Efficient construction can be achieved.

  FIG. 1 and FIG. 2 show an example of the present invention. In the figure, a split wall 2 is installed vertically along the axial direction of the tunnel 1 in a tunnel 1 excavated as a sewer. Is divided into two streams.

  The inner periphery of the tunnel 1 is covered with a plurality of concrete segments. The back split wall 2 is formed of a plurality of precast concrete plates.

  The back split wall 2 is installed vertically in the tunnel 1 along the axial direction of the tunnel 1, and the back split wall 2 is installed in a state of being connected in the axial direction of the tunnel 1, The water-swellable sealing material 3 is doubled. Further, the enlarged diameter portion 4 is formed continuously in the axial direction of the tunnel 1 at the upper end portion of the split wall 2, and the groove-like portion 5 having a groove shape in a cross-section opening right above is formed at the upper end portion of the enlarged diameter portion 4. It is formed continuously in the axial direction of the tunnel 1.

  Reinforcing channel steel 5 a is continuously attached in the axial direction of the tunnel 1 in the groove portion 5. Further, a grouting material injection hole 4a and a grouting material injection confirmation hole 4b are formed in the expanded diameter portion 4 so as to communicate from the side portion of the expanded diameter portion 4 into the groove-shaped portion 5. A plurality of pairs of the grout material injection holes 4 a and the grout material injection confirmation holes 4 b are formed at a certain distance in the axial direction of the tunnel 1.

  The upper end of the split split wall 2 formed in this way has a plurality of steelcons 6 projecting from a concrete segment installed in the ceiling portion of the tunnel 1, that is, the ceiling portion of the tunnel 1, in the groove-like portion 5. In addition to being engaged, the groove portion 5 is filled with a resinous grout material 7 from the grout injection hole 4a and fixed to the ceiling portion of the tunnel 1.

  Further, elastic sealing materials 8 and 8 are interposed between the enlarged diameter portion 4 and the ceiling portion of the tunnel 1, and in particular, the elastic sealing materials 8 and 8 sandwich the groove-shaped portion 5 on both sides in the axial direction of the tunnel 1. It is continuously doubled.

  Therefore, the upper end portion of the back split wall 2 is not completely rigidly connected to the ceiling portion in the tunnel 1, and is joined in a state close to a roller bearing capable of transmitting only the shearing force without transmitting axial compression force and bending stress. ing. Further, the upper end portion of the back split wall 2 and the ceiling portion in the tunnel 1 are double-sealed by the elastic seal material 8.

  On the other hand, the lower end portion of the back split wall 2 is embedded and fixed in the concrete of the invert 9 cast in place at the bottom of the tunnel 1. In this case, the invert concrete is not placed thickly around the back split wall 2 so that the lower end of the back split wall 2 is completely wound, but the shear force between the lower end of the back split wall 2 and the invert 9 is applied. It is desirable to cast it as thin as possible.

  Further, an elastic sealing material 10 is interposed between the lower end portion and both side portions of the back split wall 2 and the invert 9. In particular, the elastic sealing material 10 is doubled continuously in the axial direction of the tunnel 1. A water-expandable seal material is used for the elastic seal material 8 and the elastic seal material 10.

  Accordingly, the lower end portion of the back split wall 2 is joined to the bottom portion of the tunnel 1 in a state close to a pin joint rather than a complete rigid joint. Further, the lower end portion of the back split wall 2 and the invert 9 are double-sealed by the sealing material 10.

  In such a configuration, in order to fix the upper end portion and the lower end portion of the back split wall 2 to the ceiling portion and the floor portion in the tunnel 1, the back split wall 2 is first jacked up and formed on the upper end portion of the back split wall 2. A steel condenser 6 projecting from the ceiling of the tunnel 1 is engaged with the groove-shaped part 5. And the grout material 7 is inject | poured in the groove-shaped part 5 from the grout material injection hole 4a.

  Further, concrete of the invert 9 is placed on the bottom of the tunnel 1, and the concrete is continuously placed around the lower end of the back split wall 2 to embed the lower end of the back split wall 2 in the invert 9.

  In this case, in particular, since the grout material 7 is continuously filled until the grout material 7 flows out from the grout material filling confirmation hole 4b, it can be confirmed that the grout material 7 is filled in the groove-like portion 5. Can be reliably filled. Further, since the groove-like portion 5 is formed continuously in the axial direction of the tunnel 1, the grout material 7 can be injected very efficiently over the entire length of the back split wall 2 in one operation. Reference numeral 11 denotes a displacement preventing member for the invert 9.

  According to the present invention, by reducing the axial compressive stress and bending stress generated in the split wall, the member cross section of the split wall can be reduced and the economic design can be achieved.

The inside of the tunnel divided into two water flows by the back split wall is shown, (a) is a longitudinal sectional view of the tunnel, (b) is an end view of the lower end of the back split wall, and (c) is an end perspective view. The upper end part of a split wall is shown, (a) is sectional drawing which shows the state before fixation, (b) is sectional drawing which shows the state after fixation, (c) is a partial top view of an enlarged diameter part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Back split wall 3 Seal material 4 Expanded diameter part 4a Grout material injection hole 4b Grout material injection confirmation hole 5 Groove-shaped part 6 Steel con (protrusion)
7 Grout material 8 Elastic seal material 9 Invert 10 Seal material 11 Detachment member

Claims (4)

  A structure for installing a split wall installed in a tunnel, wherein a plurality of protrusions protruding from the ceiling of the tunnel are formed in the upper end of the split wall continuously in the axial direction of the tunnel. Inverted concrete in which an elastic sealing material is interposed between the ceiling of the tunnel and the upper end of the split wall, and the lower end of the split wall is driven into the bottom of the tunnel An installation structure of a split wall characterized by being embedded in a wall.   2. The installation structure for a back split wall according to claim 1, wherein an enlarged diameter portion is formed at an upper end portion of the back split wall.   The installation structure of the back split wall according to claim 1 or 2, wherein a grout material is injected into the groove-like portion. A structure for installing a split wall installed in a tunnel, wherein a plurality of protrusions protruding from the ceiling of the tunnel are continuously formed in the axial direction of the tunnel at the upper end of the split wall The elastic sealing material is interposed between the ceiling of the tunnel and the upper end of the split wall, the engaging part is a roller support, and the lower end of the split wall is the bottom of the tunnel An installation structure for a split wall, characterized in that it is buried in the concrete of Invert placed in and the lower end of the split wall becomes a pin connection.

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