JP4715610B2 - Construction method inside tunnel - Google Patents

Description

  The present invention provides a bracket-integrated segment with side wall brackets on both sides of the tunnel, a precast invert is installed at the bottom of the tunnel, a precast floor slab is installed between the side wall brackets of the segment, and The present invention relates to a construction method inside a tunnel in which a precast inner wall is installed between a precast floor slab and the precast invert.

  The inside of the shield tunnel excavated for roads and lifelines is generally an upper space A used as a roadway with a slab 30 constructed almost at the center of the tunnel as shown in FIG. It is partitioned into a lower space B that is used as a maintenance facility such as electricity or an evacuation facility, and the lower space B is further partitioned into a plurality of spaces by an inner wall 31 as necessary.

  In addition, in recent years, each part such as the slab 30, the inner wall 31, and the invert 32 has been constructed with precast concrete members as much as possible in order to save labor and shorten the construction period. ing.

JP-A-8-60997 Japanese Patent Laid-Open No. 11-55196 JP 2002-89195 A JP 2003-120195 A JP 2003-278595 A JP 2005-176322 A JP 2005-285758 A

  However, most of the segments covering the inner circumference of the tunnel are installed with the construction error at the time of excavation. Especially, the construction error of the segment due to rolling is precast concrete such as precast floor slab in the tunnel. When installing a member, there existed a subject that the installation position and the position to fix shift | deviate and become a big hindrance on construction.

  The present invention was made in order to solve the above-described problems. A construction method for the inside of a tunnel, which can accurately install a precast concrete member such as a precast floor slab in a tunnel and enables efficient construction. The purpose is to provide.

The construction method for the inside of a tunnel according to claim 1, wherein bracket-integrated segments having side wall brackets are installed on both sides of the tunnel, a precast invert is installed at the bottom of the tunnel, and a precast floor slab is installed between the side wall brackets. And the precast floor slab is a support provided with a height adjustment function of the precast floor slab. Installed on the side wall bracket via a device and a precast concrete extension bracket, and the support device includes a support bolt protruding from the extension bracket, and a support block bridged between the support bolts. The level adjustment nut screwed to the support bolt, and the level adjustment It is characterized in carrying out the height and horizontal adjustment of the precast slab by turning the Tsu bets for moving the supporting block in a vertical direction.

  In the present invention, all of the precast concrete members such as precast floor slabs and precast inverts are retrofitted, and these members are fixed to the segments by fixing bolts having a position adjustment function in the height direction and the horizontal direction. By accurately fixing the segment with the construction error at the time while fixing the construction error of the segment, the inside of the tunnel can be constructed with high accuracy and efficiency.

  In particular, the extension bracket is not only retrofitted with a fixing bolt with a position adjustment function, but the installation position, cross-sectional shape, height, protruding amount, bolt hole, etc. are measured at each installation location, making it the most suitable. By manufacturing and installing the size and shape, it is possible to eliminate the interstitial concrete and enable rational construction.

Also, when constructing the inside of the tunnel, install a mobile curing shelter as shown in Figs. 8 (a) and 8 (b) below the precast floor slab, for example. It is possible to easily secure a transport path such as the above.
Furthermore, fine adjustment of the precast floor slab can be easily performed when it is necessary to add a gradient (cant) inclined in the radial direction of the tunnel to the precast floor slab that becomes the roadway at the clothoid part or curved part of the tunnel. It is a thing.

The construction method for the interior of the tunnel according to claim 2 is the construction method for the interior of the tunnel according to claim 1, wherein the support devices are installed at predetermined intervals in the axial direction of the tunnel, and rail beams are installed between the support devices. It is characterized by being installed in the axial direction .

Construction method inside the tunnel according to claim 3 is fixed in claim 1 or 2, wherein the tunnel interior construction method, the precast invert, depending fixing bolt provided with a height adjustment function of the precast invert the bottom of the tunnel It is characterized by doing.

The construction method inside a tunnel according to claim 4 is the construction method inside a tunnel according to any one of claims 1 to 3 , wherein the precast inner wall is positioned horizontally on the precast invert. It is characterized by being fixed by a fixing bolt having an adjusting function.

The tunnel construction method according to claim 5 is the tunnel construction method according to any one of claims 1 to 4 , wherein a mortar back for adjusting the height of the precast invert is provided below the precast invert. It is characterized by intervening.

  The present invention corrects a construction error of a segment in a segment installed with a construction error at the time of tunnel excavation when performing tunnel excavation and internal construction in parallel in the construction of a road or lifeline tunnel. However, by fixing a precast concrete member such as a precast invert or a precast floor slab, the inside of the tunnel can be constructed with high accuracy and efficiency.

  FIGS. 1 to 7 show the inside of a shield tunnel (hereinafter referred to as “tunnel”). In the figure, the grounds on both sides of the tunnel are covered with a bracket-integrated segment 1 having side wall brackets 1a on the inner side. It is being crafted.

  Also, an invert composed of a plurality of precast inverts 2 is constructed at the bottom of the tunnel, a floor slab composed of a plurality of precast floor slabs 3 is constructed in an almost middle portion, and further, between the precast invert 2 and the precast slab 3 An inner wall composed of a plurality of precast inner walls 4 is constructed. Thus, the inside of the tunnel is divided into an upper space A and a lower space B by a floor slab, and the lower space B is further divided into two left and right spaces by an inner wall.

  The side wall bracket 1 a is a support part that receives the end of the precast floor slab 3, and is formed integrally with the segment 1 so as to serve as a side wall of the lower space B when the segment 1 is formed.

  The side wall bracket 1a may be formed separately from the segment 1, and may be integrated with the segment 1 by retrofitting the inner side of the segment 1 by a method such as bolting. If the side wall bracket 1a is a retrofit type, the rolling correction and meandering correction of the segment 1 during tunnel excavation can be easily performed.

  In particular, in places where the precast floor slab 3 requires a gradient (cant) inclined in the radial direction of the tunnel, or where the precast floor slab 3 requires a widened portion, such as a curved part or clothoid part of the tunnel, or a segment For example, an extension bracket 5 as shown in FIGS. 2A, 2B, and 2C is installed at a place where the height of the side wall bracket 1a is required for rolling, meandering, and the like.

  The extension bracket 5 is made of precast concrete, and is installed on the side wall bracket 1a so as to be continuous in the axial direction of the tunnel. Further, the side wall bracket 5 is formed so that the upper end on the front side facing the center side of the tunnel is formed horizontally and the side surface part is formed vertically, and the back side thereof is in close contact with the side wall bracket 1a and the inner surface of the segment 1. A portion corresponding to the bracket 1a is formed in a horizontal and vertical plane shape, and a portion corresponding to the segment 1 is formed in a convex curved surface shape.

  Further, the length of each extension bracket 5 in the tunnel axis direction is formed to be substantially the same as the width of each segment 1, and in principle, one extension bracket 5 is installed for each segment. Furthermore, the size and cross-sectional shape of each extension bracket 5 are not uniform, but are measured in advance for each installation location, and are formed in the most suitable size and cross-sectional shape.

  The additional bracket 5 formed in this way is fixed to the upper side of the side wall bracket 1a by a plurality of anchor bolts 6, respectively. The anchor bolt 6 in this case is screwed into an insert (not shown) embedded in the segment 1.

  Then, the end portion of the precast floor slab 3 is placed on the side wall bracket 1 a or the extension bracket 5 via a support device 7 having a function of adjusting the height of the precast floor slab 3.

  The support device 7 includes a plurality of support bolts 8, 8 projecting vertically on the extension bracket 5 at predetermined intervals in the radial direction of the tunnel, and a support block 9 spanned between the support bolts 8, 8. And a plurality of level adjusting nuts 10 and fixing nuts 11 which are screwed to the support bolts 8 and 8 to move the support block 9 in the vertical direction and fix the support block 9 to the support bolts 8 and 8. The support device 7 is installed on the extension bracket 5 at predetermined intervals along the axial direction of the tunnel.

  And the rail beam 12 is bridged along the axial direction of a tunnel between the support blocks 9 and 9 of each support apparatus 7 and 7, and the edge part of the precast floor slab 3 is mounted on the rail beam 12 concerned. Yes.

  The rail beam 12 may be used also as a rail of a construction carriage (not shown) that travels in a tunnel in order to lay a precast member such as the precast invert 2 or the precast floor slab 3.

  3A and 3B show a state in which the end of the precast floor slab 3 is supported on the side wall bracket 1a via the support device 7 and the rail beam 12, and particularly FIG. ) Is a stabilization of the rail beams 12 laid in a row.

  4 (a), 4 (b), and 4 (c) show the side wall bracket 1a of the bracket-integrated segment 1 installed on both sides of the tunnel further below the position of the side wall bracket 1a described in the example of FIG. The basic structure is to project further and use the additional bracket 5 together.

  In this case, a taper portion 1b is attached to the upper end portion of the side wall bracket 1a so as to have a downward slope from the center side of the tunnel toward the outside of the tunnel, and the additional bracket 5 is received by the inclined taper portion 1b. The extension bracket 1 can be received in a more stable state. Further, by increasing the size of the extension bracket 5, it is possible to secure a space for the water distribution pipe and the evacuation chute in the extension bracket.

  Further, as illustrated in FIG. 4B, an overhanging bracket 5 </ b> A may be installed inside the side wall bracket 1 a and the extension bracket 5 so as to cover these brackets, thereby forming the side wall of the lower space B.

  The side wall bracket 5 and the overhanging bracket 5A are also fixed to the segment 1 by a plurality of anchor bolts (not shown).

  For example, as shown in FIG. 5, the precast invert 2 is a plurality of fixing bolts laid in an axially continuous state on the upper side of the segment 1 installed at the bottom of the tunnel and having a level adjusting function. 13 are respectively fixed to the bottom of the tunnel.

  The fixing bolts 13 are vertically projected on the segment 1 in the tunnel axial direction and in the direction perpendicular to the axis at predetermined intervals. Level fixing adjustment nuts 14 are provided at the middle and upper ends of each fixing bolt 13. And the fixing nut 15 are screwed together.

  And the part above the adjustment nut 14 of each fixing bolt 13 penetrates the through-hole 2a formed in each corner part of the precast invert 2, and tightens the fixing nut 15 of each fixing bolt 13 strongly, so that each precast invert 2 is fixed to the bottom of the tunnel.

  Further, the height of each precast invert 2 is adjusted by moving the level adjusting nut 14 of each fixing bolt 13 in the vertical direction before tightening the fixing nut 15. A mortar bag 16 is filled between each precast invert 2 and the segment 1 thus installed. The mortar bag 16 is a bag such as a hemp bag filled with mortar.

  FIGS. 6A and 6B show another example of precast invert 2. In the example of FIG. 6A, precast invert 2 is directly laid on segment 1, and level adjustment is performed on segment 1. It is fixed by a fixing bolt 13 having no function. According to this example, since the precast invert 2 is installed in close contact with the segment 1, the mortar back can be omitted.

  FIG. 6B shows an example in which the invert is formed integrally with the segment 1. According to this example, the laying operation of the precast invert can be omitted.

  As described above, the precast floor slab 3 is bridged between the side wall brackets 1a and 1a or between the side wall bracket 1a and the additional bracket 5, or between the additional brackets 5 and 5, and both ends of the precast floor slab 3 are side wall brackets. It is placed on 1a or the extension bracket 5 via a support device 7 and a rail beam 12.

  The center of the precast floor slab 3 is placed on the upper end of the precast middle wall 4 via an adjustment block 17 made of hard synthetic rubber or the like, and is fixed to the upper end of the precast middle wall 4 by a fixing bolt 18. .

  Reinforcing ribs 3a and reinforcing ribs 3b are continuously provided in the center and both ends of the precast floor slab 3 in the axial direction of the tunnel.

  Further, the precast floor slabs 3 adjacent to each other in the axial direction of the tunnel are joined to each other by a plurality of super-long bolts, long bolts (with bolt boxes) or PC steel bars.

  The precast middle wall 4 is installed between the precast invert 2 and the precast floor slab 3, and the lower end portion of the precast middle wall 4 is built in a built-in groove 2 b formed on the upper side of the precast invert 2. . And it fixes by the fixing bolts 19 and 19 provided with the position adjustment function of the horizontal direction of the precast intermediate wall 4 in the said construction groove 2b.

  In this case, one end side of the fixing bolt 19 is horizontally screwed into an insert nut (not shown) embedded in the inner portion of the erection groove 2b, and the other end side is formed horizontally at the lower end portion of the precast middle wall 4. Is inserted into the through-hole 4a. An adjustment nut 20 is screwed to the other end side of the fixing bolt 19 so as to be in contact with the side surface of the precast middle wall 5.

  Then, with the fixing bolt 19 fixed, the adjustment nut 20 is rotated while being in contact with the side surface of the precast intermediate wall 4 and moved to the precast intermediate wall 4 side, whereby the precast intermediate wall 4 is moved to the other end of the fixed bolt 19. It can be moved sideways. The fixing bolt 19 and the adjusting nut 20 having such a configuration are attached to at least two positions on both sides of the precast middle wall 4.

  When the lower end portion of the precast middle wall 4 is built in the mounting groove 2a, the fixing bolt 19 is screwed deeply into the insert nut so that the fixing bolt 19 does not become an obstacle.

  FIG. 6B shows an example in which the lower end portion of the precast middle wall 4 is fixed to an invert formed integrally with the segment 1.

  In this case, the fixing bolt 19 provided with the adjusting nut 20 protrudes on both sides of the erection groove 2a formed on the upper side of the invert, and has the structure as described in the example of FIG. The lower end of 4 is fixed. Further, the lower end portion of the precast middle wall 4 is fixed by a fixing fitting 21 formed in an L shape in an invert.

  FIGS. 5B and 6A show another example of a method of fixing the lower end portion of the precast inner wall 4, and both of them have an L shape on the precast invert 2. 6 (a), in particular, in FIG. 6 (a), a filler 22 such as mortar is filled between the lower end portion of the precast middle wall 4 and the precast invert 2, and the precast middle wall 4 level adjustment is performed.

  In any of the examples, as shown in FIG. 7A, a concave portion 4b and a convex portion 4c that are engaged with each other are formed on the contact surfaces of the precast middle walls 4 and 4 adjacent in the axial direction of the tunnel. ing. Further, the upper end portions of the adjacent precast middle walls 4, 4 are connected to each other by a connecting plate 23.

  Next, the construction procedure of the construction method inside the tunnel of the present invention will be described.

  First, as shown in FIG. 5A, for example, a precast invert 2 is laid on the segment 1 installed at the bottom of the tunnel. The precast invert 2 is installed in the lower part of the tunnel together with the segment in the tail of the shield machine (not shown), and after laying on the segment 1, the height is adjusted by the adjusting nut 14 of each fixing bolt 13. Then, each fixing nut 15 is fastened and fixed, and a mortar bag 16 is filled under the precast invert 2.

  When filling the mortar bag 16, first, only the bag is inserted into the lower side of the precast invert 2, and then the mortar is filled into the bag at a high pressure. The mortar bag 16 can be filled very efficiently and economically.

  Next, the precast middle wall 4 is built on the precast invert 2. In this case, the lower end portion of the precast middle wall 4 is built into the erection groove 2 a of the precast invert 2. Then, the other end side 19 b of the fixing bolt 19 is inserted into the through hole 4 a formed in the lower end portion of the precast middle wall 4.

  Then, the position of the precast middle wall 4 is adjusted by appropriately turning the adjustment nut 20, and when the adjustment is completed, the adjustment nuts 20, 20 on both sides are firmly tightened to fix the lower end of the precast middle wall 4 on the precast invert 2. .

  In this case, the lower end portion of the precast middle wall 4 can be fixed by simply clamping the lower end portion of the precast middle wall 4 with the adjusting nuts 20 and 20 screwed to the fixing bolts 19 on both sides. As shown in FIG. 5B, the fixing bracket 21 can be used to firmly fix the metal fitting.

  Further, the upper ends of the precast middle walls 4, 4 adjacent to each other in the axial direction of the tunnel are connected to each other by the connecting plate 23.

  Next, the precast floor slab 3 is bridged between the upper end of the precast middle wall 4 and the side wall brackets 1a, 1a on both sides, and between the side wall bracket 1a and the extension bracket 5 (only one side of the precast floor slab is shown in the figure). In this case, both ends of the precast floor slab 3 are placed on the rail beam 18 previously laid on the side wall bracket 1a or the extension bracket 5, and the center is placed on the upper end of the precast middle wall 4 via the adjustment block 17. Place.

  Then, the adjustment nut 10 of the fixing bolt 9 of each support device 7 is turned to appropriately raise and lower the adjustment block 8 to adjust the horizontal and height of the precast slab 3. When the adjustment is completed, the center portion of each precast floor slab 3 is fixed to the upper end portion of the precast middle wall 4 with fixing bolts 18. Further, the precast floor slab 3 is joined to the existing precast floor slab 3 with a long bolt or a PC steel bar.

  In the same manner, the precast invert 2, the precast middle wall 4 and the precast floor slab 3 are sequentially installed in the tunnel excavation direction, so that the invert, floor slab and middle wall continuous in the tunnel axial direction are constructed in the tunnel. can do.

  When constructing the inside of the tunnel, for example, as shown in FIGS. 8A and 8B, by installing a movable curing shelter 24 below the precast floor slab 3, the existing floor slab 3 A conveyance path such as a segment can be secured on the lower side. As the curing shelter 24 in this case, for example, one that travels in the tunnel excavation direction by power on a rail (not shown) laid at the bottom of the tunnel is desirable.

  The present invention relates to a method of simultaneous construction of tunnel excavation and internal construction in the construction of a tunnel for roads and lifelines, in a segment installed with construction error at the time of tunnel excavation while correcting the construction error, By fixing a precast concrete member such as a precast floor slab, the inside of the tunnel can be constructed with high accuracy.

It is a longitudinal cross-sectional view which shows the structure inside a shield tunnel. The installation method of a precast floor slab is shown, (a), (b) is an enlarged view of a portion in FIG. 1, and (c) is a cross-sectional view of the roll line in FIG. 2 (a). (A), (b) shows the installation method of a precast floor slab, and is the (a) enlarged view in FIG. (A)-(c) is a longitudinal cross-sectional view which shows the structure inside a shield tunnel. (A), (b) is the C section enlarged view in FIG. 1 which shows the installation method of a precast invert and a precast inner wall. (A), (b) is the C section enlarged view in FIG. 1 which shows the installation method of a precast invert and a precast inner wall. The installation method of a precast middle wall is shown, (a) is a partial perspective view, (b) is sectional drawing which shows the junction part of a precast middle wall and a precast floor slab. The use state of a curing shelter is shown, (a) is a sectional view in the diameter direction of the shield tunnel, (b) is a partial sectional view in the axial direction of the shield tunnel. It is a longitudinal cross-sectional view which shows the structure inside the conventional shield tunnel.

Explanation of symbols

1 Bracket-integrated segment 1a Side wall bracket 2 Precast invert 3 Precast floor slab 4 Precast inner wall 5 Additional bracket 5A Overhang bracket 6 Anchor bolt 7 Support device 8 Support bolt 9 Support block 10 Level adjustment nut 11 Fixed nut 12 Rail beam 13 Fixed Bolt 14 Adjustment nut 15 Fixing nut 16 Mortar back 17 Adjustment block 18 Fixing bolt 19 Fixing bolt 20 Adjustment nut 21 Fixing bracket 22 Filler 23 Connecting plate 24 Curing shelter

Claims (5)

Bracket integrated segments with side wall brackets are installed on both sides of the tunnel, a precast invert is installed at the bottom of the tunnel , a precast floor slab is installed between the side wall brackets, the precast floor slab and the precast invert In the construction method of the inside of the tunnel in which a precast intermediate wall is installed between the precast floor slab, the side wall is provided via a support device having a height adjusting function of the precast floor slab and an additional bracket made of precast concrete. The support device is installed on a bracket, and the support device includes a plurality of support bolts protruding on the extension bracket, a support block spanned between the support bolts, and a level adjustment screwed to the support bolt. A nut, and turn the level adjustment nut to move the support block up and down Tunnel interior construction method which is characterized in that the height and horizontal adjustment of the precast slab by moving the. The construction method for the inside of a tunnel according to claim 1 , wherein the support devices are installed at predetermined intervals in the axial direction of the tunnel, and rail beams are installed between the support devices in the axial direction of the tunnel. The construction method for the inside of a tunnel according to claim 1 or 2 , wherein the precast invert is fixed to a bottom portion of the tunnel by a fixing bolt having a height adjusting function of the precast invert. The construction inside a tunnel according to any one of claims 1 to 3 , wherein the precast inner wall is fixed on the precast invert by a fixing bolt having a function of adjusting a horizontal position of the precast inner wall. Construction method. The construction method for the inside of a tunnel according to any one of claims 1 to 4 , wherein a mortar back for adjusting the height of the precast invert is interposed under the precast invert.

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