JP6427814B2 - Tunnel construction method, invert construction method, and formwork apparatus - Google Patents

Description

  The present invention relates to a tunnel construction method, an invert construction method, and a formwork apparatus.

  Mountain construction methods and shield construction methods are known as tunnel construction methods. In order to increase the yield strength by using the tunnel lining as a closed cross-section and prevent settlement and deformation, an invert may be installed at the inner bottom of the tunnel. In particular, in the construction of railway tunnels, inverts are often constructed as a measure to prevent the mud phenomenon due to repeated train loads even when expansion pressure does not work.

  FIG. 15 is a diagram for explaining the lining of a conventional railway tunnel. The lining of FIG. 15 is composed of a primary support 100 and a secondary lining 110. The primary support 100 is a structure that is constructed on the excavation surface for the purpose of ensuring the stability of natural ground during tunnel excavation, for example, and is usually constructed by shotcrete, steel support, rock bolts, etc. Has been built. Further, the secondary lining 110 is a structure that is constructed inside the primary support 100 and is usually made of unreinforced concrete.

  Moreover, in a railway tunnel, the roadbed 300 for installing a track | orbit etc. in the upper part of the invert 200 is normally constructed | assembled. Since the roadbed 300 is usually made of reinforced concrete and has a thinner member than the invert 200, the end portion is likely to warp due to drying shrinkage after placement. Therefore, at the time of placing the roadbed concrete forming the roadbed 300, it is desirable to fix the roadbed concrete to the existing invert 200 through an anchor (fixing) member such as a fixing reinforcing bar or a stat gibber.

JP2013-11160A

  However, in tunnel construction, after placing invert concrete, it is often the case that roadbed concrete is cast after a relatively long period of time. After several years have passed since the construction of invert 200, roadbed 300 is built on invert 200. It is not unusual to do. Therefore, when the invert concrete is placed with the anchor member protruding upward from the top of the concrete, the existing invert 200 is moved back and forth on the existing invert 200 until the roadbed 300 is constructed. There is a risk of hindering smooth traffic. Further, when the construction vehicle collides with the anchor member protruding from the existing invert 200, the anchor member or the construction vehicle may be damaged.

  Therefore, a method of constructing a post-construction anchor on the existing invert 200 when placing the roadbed concrete is also considered as one proposal. According to this, it is not necessary to install an anchor member when placing invert concrete, and it is possible to ensure fixation between the existing invert 200 and the roadbed 300. However, there is a problem that the post-construction anchor is very expensive and disadvantageous in cost.

The present invention has been made in view of the above-described problems, and the object of the present invention is to allow construction vehicles to pass through existing inverts without hindrance, and to be constructed on inverts without excessive cost increase. It is to provide a technique related to a tunnel construction method that can suppress the warping of the roadbed.

  In order to solve the above-described problems, the present invention arranges a recess forming mold for forming a recess on the upper surface of the invert at the invert construction site, and forms a bottom surface of the recess of the recess forming mold. The invert concrete was placed in a state where the invert side fixing member was suspended from the recess forming mold while the connecting portion of the invert side fixing member was in contact with the invert concrete.

  More specifically, the tunnel construction method according to the present invention is a tunnel construction method including an invert, and a recess for forming a recess on the upper surface of the invert at a predetermined invert construction site for constructing the invert. In a state in which the connecting portion of the invert side fixing member embedded in the invert is brought into contact with the bottom surface of the mold forming the concave bottom surface of the concave portion of the concave portion forming mold. A suspending step of suspending the invert side fixing member on the recess forming mold; and an invert concrete placing step of placing invert concrete on the invert construction site.

  According to the present invention, since the position of the connecting portion of the invert side fixing member can be arranged at a position lower than the upper surface of the invert, the construction vehicle can be passed through the invert after construction without any trouble. Further, since the construction vehicle traveling on the invert does not collide with the inversion side fixing member, there is no possibility that the inversion side fixing member and the construction vehicle are damaged. In addition, as described above, by placing the invert concrete in a state where the connecting portion of the invert side fixing member is in contact with the bottom surface of the recess forming mold, the recess forming mold is removed, and then the recess is formed. The connecting portion can be exposed to the outside from the concave bottom surface. According to this, when the roadbed is constructed on the invert, the roadbed-side concrete can be placed after connecting the roadbed-side fixing member to the connecting portion of the invert-side fixing member. The roadbed concrete can be suitably fixed without using expensive post-construction anchors. That is, it is possible to suppress the warpage of the roadbed constructed on the invert without accompanying an excessive cost increase.

  Further, in the tunnel construction method, after the recess forming mold is removed from the invert, the road base side fixing member embedded in the road base constructed on the invert is connected to the connecting portion exposed to the outside from the concave bottom surface. It may further include a connecting step and a roadbed concrete placing step of placing roadbed concrete on the invert so as to embed the roadbed side fixing member connected to the connecting portion.

  Moreover, you may arrange | position the said recessed part formation formwork in the position corresponding to the edge part vicinity of the roadbed built on the said invert in the said formwork arrangement | positioning process. By doing in this way, the warping of a roadbed resulting from drying shrinkage can be suppressed much more effectively.

  The recess forming mold may be a long member, and the plurality of invert side fixing members may be suspended along the longitudinal direction of the recess forming mold in the suspending step. By doing in this way, it is excellent in workability | operativity at the time of fixing an invert side fixing member with respect to a recessed part formation mold form, and also the positioning accuracy of an invert side fixing member can be improved.

  Further, in the invert concrete placing step, the recess forming mold may be used as a ruler for aligning the top end of the invert concrete. By doing in this way, the top end of invert concrete can be easily adjusted to regular height, and it can control that unevenness arises in invert concrete. As a result, the invert can be constructed with high accuracy.

  Moreover, the mark which shows the top end position of the said invert concrete may be displayed on the mold side surface which forms the concave side surface of the said recessed part among the said recessed part formation molds. According to this, the invert can be constructed with higher accuracy, and the invert shape management becomes even easier.

  Further, in the mold frame arranging step, the recess forming mold frame may be arranged along the axial direction of the tunnel. According to this, even if the design top end position of invert concrete is inclined along the axial direction of the tunnel, the recessed form forming frame arranged along the axial direction of the tunnel is used as a ruler for aligning the top end. By doing so, inverted concrete can be placed with high accuracy as designed.

  Moreover, this invention can be specified as an invert construction method installed in a tunnel. For example, the present invention is an invert construction method installed in a tunnel, and a mold in which a recess forming mold for forming a recess on the upper surface of the invert is disposed at a predetermined invert construction site for constructing the invert. A frame arranging step, and the invert side fixing member in a state where the connecting portion of the invert side fixing member embedded in the invert is in contact with the bottom surface of the mold forming the concave bottom surface of the concave portion of the concave forming mold. An invert construction method comprising: a suspension process for suspending a recess forming mold; and an invert concrete placing process for placing invert concrete at the invert construction site.

  Moreover, this invention can be specified as a formwork apparatus for constructing a tunnel invert. For example, the present invention is a formwork device for constructing a tunnel invert, which is disposed at a predetermined invert construction part for constructing the invert and for forming a recess on the upper surface of the invert. And an inversion-side fixing member embedded in the invert, wherein the inversion-side fixing member is connected to a roadbed-side fixing member embedded in the roadbed constructed on the invert, and the concave portion of the recess is formed in the recess forming mold. And an invert side fixing member suspended from the recess forming mold in a state where the connecting portion is in contact with the bottom of the mold forming the bottom.

  The means for solving the problems in the present invention can be combined as much as possible.

  ADVANTAGE OF THE INVENTION According to this invention, the construction vehicle can pass through existing inverts without trouble, and it can suppress the curvature of the roadbed constructed | assembled on invert without accompanying an excessive cost increase.

FIG. 1 is a diagram illustrating a schematic structure of a tunnel according to an embodiment. FIG. 2 is a cross-sectional view of the tunnel according to the embodiment. FIG. 3 is an enlarged view of an invert groove portion in the invert according to the embodiment. Drawing 4 is a figure showing the construction method of the tunnel concerning an embodiment (1). Drawing 5 is a figure showing the construction method of the tunnel concerning an embodiment (2). Drawing 6 is a figure showing the construction method of the tunnel concerning an embodiment (3). Drawing 7 is a figure showing the construction method of the tunnel concerning an embodiment (4). FIG. 8 is a diagram showing a tunnel construction method according to the embodiment (5). FIG. 9 is a view showing a tunnel construction method according to the embodiment (6). FIG. 10 is a diagram showing a tunnel construction method according to the embodiment (7). FIG. 11 is a diagram illustrating a tunnel construction method according to the embodiment (8). FIG. 12 is a view showing a tunnel construction method according to the embodiment (9). FIG. 13: is a figure which shows the construction method of the tunnel which concerns on embodiment (10). FIG. 14 is a view showing a tunnel construction method according to the embodiment (11). FIG. 15 is a diagram for explaining the lining of a conventional railway tunnel.

  Embodiments according to the present invention will be described below with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Not too much.

<Embodiment>
FIG. 1 is a diagram illustrating a schematic structure of a tunnel 1 according to the embodiment. Reference numeral 10 shown in FIG. 1 indicates primary support, and reference numeral 11 indicates secondary lining. The primary support 10 is constructed of shotcrete, steel support, and lock bolts. The secondary lining 11 is constructed of unreinforced concrete constructed inside the primary support 10.

  Reference numeral 3 in FIG. 1 indicates inversion. The invert 3 is a foundation member that contributes to increasing the yield strength by using the lining of the tunnel 1 as a closed section and preventing settlement and deformation, and is made of reinforced concrete. As illustrated, the invert 3 is installed at the bottom (inner lower part) of the tunnel 1 and supports the secondary lining 11.

  FIG. 2 shows a cross section of the tunnel 1 after the roadbed 4 according to the embodiment is constructed. The roadbed 4 is a reinforced concrete member for installing a track (not shown), and is constructed by being laminated on the invert 3. Since the roadbed 4 is smaller (thin) than the invert 3, it is easily affected by drying shrinkage after placement. Therefore, in this embodiment, fixing between the invert 3 and the roadbed 4 is ensured through the fixing anchor 5, and the end of the roadbed 4 is prevented from warping up. FIG. 1 shows a state before the roadbed 4 is constructed on the upper part of the invert 3.

  Reference numeral 31 shown in FIGS. 1 and 2 is a central passage provided in the invert 3. The central passage 31 is a concave groove provided in the center in the width direction of the tunnel 1 along the extending direction (axial direction, longitudinal direction) of the tunnel 1. It is a passage for inspectors to walk. A drainage channel (not shown) is disposed below the invert 3 along the axial direction of the tunnel 1.

  As shown in FIG. 1, the upper surface of the invert 3 is divided into left and right parts with a central passage 31 in between. Hereinafter, the direction indicated by reference numeral 32a is referred to as a “first invert upper surface”, and the direction indicated by reference numeral 32b is referred to as a “second invert upper surface”. A plurality of groove portions 33 are extended in the invert 3 along the axial direction of the tunnel 1. The groove portions (hereinafter referred to as “invert groove portions”) 33 are provided in the vicinity of the end portions in the width direction of the first invert upper surface 32a and the second invert upper surface 32b. In the example shown in FIG. 1, a total of four invert groove portions are provided. 33 extends along the axial direction of the tunnel 1. The first invert upper surface 32a and the second invert upper surface 32b are collectively referred to as “invert upper surface 32”. As shown in FIG. 2, the roadbed 4 is provided on each of the upper portions of the first invert upper surface 32a and the second invert upper surface 32b. Hereinafter, the roadbed laminated on the first invert upper surface 32a of the invert 3 is referred to as “first roadbed 4a”, and the roadbed laminated on the second invert upper surface 32b is referred to as “second roadbed 4b”.

FIG. 3 is an enlarged view of the invert groove 33 in the invert 3 according to the embodiment. An invert side fixing member 6 that forms a part of the fixing anchor 5 is embedded in the invert 3 at a position corresponding to the invert groove 33. The invert side fixing member 6 includes a connecting insert portion 61 and an anchor portion 62 attached to the lower portion of the connecting insert portion 61. The connection insert part 61 is, for example, a long nut provided with a thread groove inside, and corresponds to the connection part in the present invention. The anchor portion 62 is a bolt screwed into the thread groove from the lower end side of the connecting insert portion 61.

  In the groove bottom 33a of the invert groove 33, an insertion port 61a located at the upper end of the connecting insert portion 61 is opened in a state exposed to the outside. Further, the height of the insertion opening 61 a of the connecting insert portion 61 is the same level (level) as the groove bottom 33 a of the inverted groove portion 33.

  A reference numeral 63 shown in FIG. 3 is a temporary fixing bolt inserted and fixed to the connecting insert portion 61 from the insertion port 61 a of the connecting insert portion 61 in the invert side fixing member 6. The temporary fixing bolt 63 is detachably attached to the connecting insert portion 61 by being screwed into the thread groove of the connecting insert portion 61 or releasing the screwing. As described above, when the tunnel 1 is constructed, it may take a long time after the invert 3 is constructed until the roadbed 4 is constructed. Therefore, in the present embodiment, by inserting the temporary fixing bolt 63 into the connecting insert portion 61 of the invert 3, foreign matters such as dust and earth and sand are prevented from entering the connecting insert portion 61. . In the present embodiment, the invert groove portion is formed such that the height of the top surface of the temporary fixing bolt 63 is equal to or less than the height of the edge portion of the invert groove portion 33 in a state where the temporary fixing bolt 63 is inserted into the connecting insert portion 61. The depth of 33 is adjusted. That is, the temporary fixing bolt 63 inserted into the connection insert portion 61 is adjusted so as not to protrude upward from the upper surface 32 of the invert 3.

  Next, with reference to FIGS. 4-14, the construction method of the tunnel 1 which concerns on embodiment is demonstrated. 4 and 5 are diagrams for explaining the formwork device 7 for constructing the invert 3. The invert 3 is extended by, for example, 10 to 12 m per concrete placement. The formwork apparatus 7 shown in FIG. 4 and FIG. 5 is installed in a part where the invert 3 is newly constructed (hereinafter, referred to as “invert placing work area”). FIG. 4 is a plan layout view of the formwork device 7 in the invert placing area. 5 is a cross-sectional view taken along the line AA ′ of FIG. In the present embodiment, the invert placing area corresponds to the invert construction site in the present invention.

  The formwork apparatus 7 includes a wife formwork 71 disposed at the end of the invert placing section, a groove formwork 72 for forming the invert groove 33, a center path formwork 73 for forming the center passage 31, and the like. Including. In addition, the operation | work which installs the formwork apparatus 7 is performed in the state in which the primary support 10 was constructed | assembled. In addition, a crushed stone (not shown) is laid on the flooring surface of the invert placing area, and a reinforcing bar (not shown) is assembled on the crushed stone. In the present embodiment, a long C-shaped channel steel material is used for the groove mold 72, and the groove mold 72 is extended and disposed along the axial direction of the tunnel 1.

  FIG. 6 is a view for explaining the groove mold 72 (C-type channel steel). The groove mold 72 has a web 72a and a pair of flanges 72b. In FIG. 6, the groove mold 72 is positioned in a posture in which the web 72 a faces downward and the pair of flanges 72 b stand up from the web 72 a. The positioning of the groove mold 72 is not limited to a specific method. For example, the temporary steel 74 horizontally mounted in the tunnel 1, the height-adjusting support member 75 self-supporting on the floor surface, The groove mold 72 can be fixed at a predetermined position by the stretched wire 76 or the like.

In the present embodiment, four long groove molds 72 are arranged so as to extend along the axial direction of the tunnel 1 in the invert placement section (formwork arranging step). More specifically, after the construction of the invert 3, the four groove molds 72 are disposed in the vicinity of the end portions in the width direction of the invert upper surface 32 and the second invert upper surface 32b. The positions of the groove molds 72 correspond to the vicinity of the ends of the first roadbed 4a and the second roadbed 4b constructed on the invert 3.

  Here, the temporary steel material 74 may be, for example, a steel material (for example, H-shaped steel or angle steel) fixed to the steel support of the primary support 10. In consideration of easiness of demolding after the invert 3 is constructed, the groove mold 72 is fastened to the temporary steel material 74 by using a fastener such as a clam clamp. . Further, the support member 75 may be, for example, a rod-like member such as a reinforcing bar that is self-supported by piercing the tip side of the floored surface. The support member 75 adjusts the installation height of the groove mold 72 by supporting the groove mold 72 from below. Further, the wire 76 increases the degree of fixation of the groove mold 72 and increases its rigidity so that the position of the groove mold 72 does not shift during concrete placement. However, as described above, various modes can be adopted as specific means for installing the groove mold 72 at a predetermined position.

  The groove mold 72 will be described in detail with reference to FIG. 6. A fixing hole 72 c for fixing the invert side fixing member 6 is formed in the web 72 a of the groove mold 72. The fixing holes 72 c are formed at regular intervals in the longitudinal direction of the groove mold 72. In addition, although mentioned later in detail, the space | interval of the fixing holes 72c in the groove form frame 72 prescribes | regulates the space | interval of the invert side fixing members 6 after construction of the invert 3, and is set to about 3 to 5 m, for example. Also good.

  In constructing the invert 3, the invert side fixing member 6 is fixed to each fixing hole 72 c formed in the web 72 a of the groove form 72. Specifically, as shown in FIGS. 7 and 8, a temporary fixing bolt 63 is inserted into the fixing hole 72c from the upper surface of the web 72a, and the connecting insert portion 61 of the invert side fixing member 6 is sandwiched between the web 72a and the fixing insert 72c. Screw to fix. In this manner, the invert side fixing member 6 is suspended from the groove mold 72 in a state where the insertion port 61a located at the upper end of the connecting insert portion 61 in the invert side fixing member 6 is in contact with the lower surface 72d of the web 72a. (Hanging process). Thereby, the plurality of invert side fixing members 6 are suspended at regular intervals along the longitudinal direction of the groove mold 72 which is a long member. As described above, the installation of the formwork device 7 in the invert placing area is completed.

  When the installation of the formwork device 7 is completed, the invert concrete 30 is placed in the invert placing section as shown in FIGS. 9 and 10 (invert concrete placing step). Note that the lower surface 72d of the web 72a of the groove form frame 72 (see FIGS. 7 and 8) is positioned at a relatively higher position than the concrete top edge (CON top edge) of the invert concrete 30. Yes. Thereby, when the groove mold 72 is removed from the mold after the invert concrete 30 is hardened, the invert groove 33 can be formed in a portion occupied by the groove mold 72.

  In the present embodiment, a mark M1 indicating the position of the concrete top edge of the invert concrete 30 (concrete driving height) is displayed on the flange 72b of the grooved frame 72. Thereby, the top end of the invert concrete 30 can be easily adjusted to a regular height. However, in the present embodiment, the mark M1 is formed by a line drawn linearly on the flange 72b, but the present invention is not limited to this. In this way, in this embodiment, the groove mold 72 can be used as a ruler for aligning the top end of the inverted concrete 30. Thereby, it is possible to suppress the occurrence of unevenness in the invert concrete 30, and the invert 3 can be constructed with high accuracy. Therefore, the management of the finished shape of the invert 3 becomes even easier.

FIG. 11 is a view showing the situation around the groove form 72 after the invert concrete 30 is placed. In the present embodiment, after placing the invert concrete 30, the groove mold 72 is removed from the invert concrete 30 after a predetermined curing period has elapsed. The demolding of the groove mold 72 is performed with the temporary fixing bolts 63 removed from the groove mold 72. In this manner, when the groove mold 72 is removed from the cured invert concrete 30, the invert groove 33 appears in the portion that has been occupied by the groove mold 72 until then as shown in FIG. Further, the invert side fixing member 6 is embedded below the invert groove 33, and the insertion opening 61 a in the connecting insert 61 is exposed and opened to the outside at the groove bottom 33 a of the invert groove 33.

  Next, the temporary fixing bolt 63 is attached to the connecting insert portion 61 of the invert side fixing member 6. Thereby, the invert 3 in the state shown in FIG. 3 is obtained. According to the construction method of the invert 3 according to the present embodiment, the invert groove portion 33 is formed on the upper surface 32 of the invert 3, and the insertion opening 61 a of the connecting insert portion 61 of the invert side fixing member 6 embedded in the invert 3 is used as the invert groove portion 33. It can be exposed to the groove bottom 33a. According to this, since the position of the connecting insert portion 61 of the invert side fixing member 6 can be arranged at a position lower than the upper surface 32 (the first invert upper surface 32a and the second invert upper surface 32b) of the invert 3, it is constructed. The construction vehicle can be run (passed) on the invert 3 later without any trouble. Further, since the construction vehicle traveling on the invert 3 does not collide with the invert side fixing member 6, there is no possibility that the invert side fixing member 6 and the construction vehicle are damaged.

  In the present embodiment, after the invert 3 is constructed and before the roadbed 4 is constructed on the invert 3, the temporary fixing bolt 63 is inserted into the connecting insert portion 61 embedded in the invert 3 as described above. Since it did in this way, it can suppress that foreign materials, such as dust and earth and sand, enter into the inside of the connection insert part 61. FIG.

  When the roadbed 4 is constructed on the invert 3, the temporary fixing bolt 63 inserted in the connecting insert portion 61 of the invert side fixing member 6 is removed, and the roadbed side embedded in the roadbed 4 as shown in FIG. 13. The fixing member 8 is connected to the connection insert portion 61 (connection process). In the present embodiment, a stud dowel is used as the roadbed side fixing member 8, but is not limited thereto. Further, the roadbed fixing member 8 can be connected to the connecting insert portion 61 of the invert fixing member 6 by various methods. For example, the base end portion of the road base side fixing member 8 (stud gibber) may be welded to the insertion port 61a of the connecting insert portion 61, or the base end side of the road base side fixing member 8 (stud gibber) may be threaded. In addition, the road base side fixing member 8 may be screwed into the screw groove of the connecting insert portion 61. Further, the temporary fixing bolt 63 may be diverted as the roadbed side fixing member 8. In this embodiment, the fixing anchor 5 shown in FIG. 2 is configured by connecting the invert side fixing member 6 and the roadbed side fixing member 8 together.

  Then, in accordance with the size and position of the roadbed 4 to be constructed, the formwork for placing the roadbed concrete is placed and arranged (not shown), and the roadbed concrete 40 is placed on the invert 3 ( Subbase concrete placing process).

  FIG. 14 is a diagram for explaining a fixing state between the invert concrete 30 and the roadbed concrete 40. In this embodiment, the fixing anchor 5 is constituted by the invert side fixing member 6 and the roadbed side fixing member 8 which are connected to each other. Here, the invert side fixing member 6 is already fixed to the invert concrete 30, and the roadbed side fixing member 8 connected to the invert side fixing member 6 is fixed to the roadbed concrete 40 in the roadbed concrete placing process.

According to this, the roadbed concrete 40 can be suitably fixed to the existing invert 3 via the fixing anchor 5. Accordingly, even when the roadbed 4 (roadbed concrete 40) after the construction is dried and contracted, since the fixation of the roadbed 4 with respect to the invert 3 is secured, it is preferable to suitably suppress the end of the roadbed 4 from warping. it can. And according to the construction method of the tunnel 1 which concerns on this embodiment, fixation of the existing invert 3 and the roadbed 4 (roadbed concrete 40) can be ensured, without using an expensive post-construction anchor. That is, according to the construction method of the tunnel 1 according to the present embodiment, the construction vehicle can pass through the existing invert 3 without hindrance, and is constructed on the invert without excessive cost increase. The warping of the roadbed can be suppressed.

  In the present embodiment, the groove formwork 72 is arranged at a position corresponding to the vicinity of the end of the roadbed 4 constructed on the invert 3 in the formwork placement step, so the roadbed 4 caused by drying shrinkage. Can be more effectively suppressed. However, the position where the groove mold 72 is installed is not limited to the above arrangement example.

  Further, the groove mold 72 in the present embodiment is a long member, and a plurality of invert side fixing members 6 are suspended from the groove mold 72 along the longitudinal direction of the groove mold 72. According to this, it is excellent in workability at the time of fixing the invert side fixing member 6 to the groove mold 72, and the positioning accuracy of the invert side fixing member 6 can be improved.

  The invert 3 is often provided with a gradient (inclination) in the axial direction of the tunnel 1. On the other hand, in this embodiment, a long groove mold 72 used as a ruler for aligning the top end of the inverted concrete 30 is arranged along the axial direction (stretching direction) of the tunnel 1. According to this, even if the design top end position of the inverted concrete 30 is inclined along the axial direction of the tunnel 1, the mark M <b> 1 displayed on the long groove form 72 extending along the axial direction of the tunnel 1 is displayed. Based on this, the invert concrete 30 can be placed with high accuracy as designed.

  While the embodiments of the present invention have been described above, the above embodiments can be variously changed, improved, combined, and the like without departing from the gist of the present invention. For example, in this embodiment, a long member is used for the groove mold 72, but the present invention is not limited to this, and various recess forming molds capable of forming a recess on the upper surface 32 of the invert 3. Can be used. Of course, the groove mold 72 (recess-forming mold) may be formed using other materials such as wood and resin, not limited to steel. In this embodiment, the plurality of invert side fixing members 6 are fixed to the groove mold 72, but the number of fixing the invert side fixing members 6 is not particularly limited.

DESCRIPTION OF SYMBOLS 1 ... Tunnel 3 ... Invert 4 ... Subbase 5 ... Fixing anchor 6 ... Invert side fixing member 7 ... Formwork apparatus 8 ... Subbase side fixing member 10 ... Primary support 11 ... Secondary lining 30 ... Invert concrete 33 ... Invert groove 40 ... Roadbed concrete 61 ... Connection insert 62 ... Anchor 63 ... Temporary fixing bolt 72 ... Groove formwork

Claims (9)

A tunnel construction method with inverts,
A mold placement step of placing a recess forming mold for forming a recess on the upper surface of the invert at a predetermined invert construction site for building the invert;
Of the recess forming mold, the bottom of the mold forming the concave bottom surface of the recess is connected to an invert side fixing member embedded in the invert and connected to a road base side fixing member embedded in the road base constructed on the invert. A suspending step of suspending the invert side fixing member on the recess forming mold in a state in which the connecting portion for contact is brought into contact,
An invert concrete placing step for placing invert concrete at the invert construction site;
A method for constructing a tunnel. After removing the recess forming mold from said inverted, the connecting part exposed to the outside from the concave bottom surface, and a connecting step of connecting the front kilometers platen side fixing member,
A roadbed concrete placing step for placing roadbed concrete on the invert so as to embed the roadbed side fixing member connected to the connection portion;
The tunnel construction method according to claim 1, further comprising: In the mold placement step, the recess forming mold is placed at a position corresponding to the vicinity of the end portion of the roadbed constructed on the invert.
The tunnel construction method according to claim 1 or 2.   4. The recess forming mold is a long member, and the plurality of invert side fixing members are suspended along the longitudinal direction of the recess forming mold in the suspending step. The tunnel construction method described in the paragraph.   The tunnel construction method according to claim 4, wherein in the invert concrete placing step, the recess forming mold is used as a ruler for aligning the top end of the invert concrete. The tunnel construction method according to claim 5, wherein a mark indicating a top end position of the inverted concrete is displayed on a side surface of the mold forming the concave side surface of the concave portion of the concave forming mold.   The tunnel construction method according to claim 5 or 6, wherein, in the mold placement step, the recess forming mold is placed along an axial direction of the tunnel. An invert installation method installed in a tunnel,
A mold placement step of placing a recess forming mold for forming a recess on the upper surface of the invert at a predetermined invert construction site for building the invert;
Of the recess forming mold, the bottom of the mold forming the concave bottom surface of the recess is connected to an invert side fixing member embedded in the invert and connected to a road base side fixing member embedded in the road base constructed on the invert. A suspending step of suspending the invert side fixing member on the recess forming mold in a state in which the connecting portion for contact is brought into contact,
An invert concrete placing step for placing invert concrete at the invert construction site;
An invert construction method. A formwork device for constructing a tunnel invert,
A recess forming mold for forming a recess on an upper surface of the invert, and an invert side fixing member embedded in the invert, which is disposed on a predetermined invert construction site for constructing the invert, and is constructed on the invert The concave portion is formed in a state in which the connecting portion is connected to a roadbed-side fixing member embedded in the roadbed, and the connecting portion is in contact with the bottom surface of the mold forming the concave bottom surface of the concave portion of the concave forming mold. An invert fixing member suspended from the formwork;
Comprising
Formwork device.

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