JP7152719B2 - Center for lining - Google Patents

Description

The present invention relates to a lining center.

For example, in tunnels where vehicles travel, various equipment and members such as ventilators such as jet fans, warning display boards and signs, lighting equipment, cables, sound absorbing boards and ceiling boards are suspended from the ceiling and shoulders of the tunnel. is lowered. Various devices and members are also suspended in tunnels that are used for other purposes.
Suspension of such devices is carried out by suspending the devices via embedded metal fittings provided with suspension jigs attached to the inner peripheral surface of the tunnel. There are various forms of embedded fittings, for example, a form consisting only of a hanging jig such as a hook and an anchor, or a form in which multiple anchors are attached to one side of a steel plate and a hanging jig is attached to the other side of the plate. Examples include the form in which it is attached.
When constructing a new tunnel, concrete is poured into the space between the formwork such as the center and the tunnel excavation hole while the anchors that make up the embedded metal fittings are embedded in the reinforcing bars for lining and temporarily fixed. By doing so, the anchor is fixed in the concrete and the embedded fitting is attached to the inner peripheral surface of the tunnel. On the other hand, when attaching an embedded metal fitting to the inner peripheral surface of an existing tunnel, the embedded metal fitting is attached to the inner peripheral surface of the tunnel by driving post-installed anchors for forming the embedded metal fitting into the concrete.

As a conventional suspension anchor structure, a suspension anchor structure excellent in safety has been proposed, which does not come off even when the lining concrete is damaged such as falling off. Specifically, the insert embedded so as to open on the surface of the lining concrete, the fixing portion integrally formed at the end of the insert on the back side, and the reinforcing bars arranged in the lining. In addition, the reinforcing bars are arranged in a grid pattern on the surface side of the fixing part, and the fixing part has a width dimension equal to or larger than the interval between the reinforcing bars (see, for example, Patent Document 1).

JP 2015-169017 A

By the way, in constructing the tunnel lining using the lining center in order to realize efficient construction of the tunnel lining, when installing the above-described embedded metal fittings in a predetermined position of the tunnel, the reinforcing bars for the lining must be installed. After construction, embedded metal fittings are attached to the lining rebar before the center is moved into the tunnel. However, it is not easy to specify the installation position of the embedded metal fittings and to accurately install the embedded metal fittings with respect to the lining reinforcing bars that spread three-dimensionally in the longitudinal direction and the circumferential direction of the tunnel. Accurate installation requires time and effort.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lining center that allows an embedded metal fitting to be installed accurately and efficiently when constructing a lining using the center.

In order to achieve the above object, one aspect of the lining center according to the present invention is
A lining center applied when placing lining concrete for a tunnel,
The lining center has a gantry and a center foam supported by the gantry,
The center form has an inspection opening, a slide frame is provided in the vicinity of the inspection opening, and an inspection window is slidably attached to the slide frame,
An embedded metal fitting having at least an anchor is fixed to the inspection window, and the embedded metal fitting is installed in the inspection opening by moving the inspection window along the slide frame.

According to this aspect, the inspection window is slidably attached to the slide frame provided in the vicinity of the inspection opening of the central form, and the embedded metal fixture fixed to the inspection window moves by moving the inspection window along the slide frame. By being installed in the inspection opening at the desired position, the embedded metal fitting can be installed in the inspection opening at a desired position with high precision and efficiency.
Here, for example, the gantry (a gate-type mobile platform) that moves in the longitudinal direction of the tunnel along the rails laid in the tunnel is extended vertically, horizontally, diagonally upward, or diagonally downward. The central form is supported via the supporting member. A plurality of inspection openings are opened in the central form at intervals in the longitudinal direction and in the circumferential direction. An inspection window is detachably provided in each inspection port. In the casting space between the center form and the tunnel excavation hole (or the shotcrete layer on the surface of the tunnel excavation hole), concrete is poured after lining reinforcing bars are arranged. However, the tip of the placing hose extending in the tunnel faces the placing space through the inspection port, and concrete can be placed in the placing space. Also, a vibrator can be inserted into the casting space through a separate inspection port. Furthermore, it is possible to check the status of concrete placement through the inspection port.

In the lining center of this aspect, embedded metal fittings are respectively installed in a plurality of inspection openings at desired positions among the plurality of inspection openings formed in the center form. Among the multiple inspection openings that are opened at intervals in the circumferential direction of the center form, for example, when installing the embedded metal fittings through the inspection openings on the left and right shoulders, etc., there are multiple inspection openings at the corresponding positions on the gantry. A slide frame is attached, and an inspection window is slidably attached to each slide frame. In this way, the slide frame corresponding to the inspection opening where the embedded metal fitting is installed is attached to the gantry to form the lining center.
In the vicinity of the slide frame, it is preferable that a suspension rail extending in the longitudinal direction of the tunnel is provided, and a chain block or the like is slidably suspended from the suspension rail. By suspending the embedded metal fitting using a chain block and installing the embedded metal fitting while suspending it against the inspection window, even if the embedded metal fitting is heavy, the embedded metal fitting can be efficiently placed in the inspection window without any load. can be installed.

An embedded metal fitting is fixed to the inspection window, and the inspection window is positioned in the inspection opening by moving the slide frame, so that the embedded metal fitting fixed to the inspection window faces the concrete placing space through the inspection opening. Embedded metal fittings installed in inspection ports have various forms, but at least have anchors. For example, there are straight anchors only (some or all of them are embedded in the lining concrete), anchors and hanging jigs are integrated, and anchors are attached to one side of a steel plate. Examples include the form in which it is attached. When fixing the latter form of embedded metal fittings to the lining concrete, a steel plate is positioned in the inspection opening, and for example, a plurality of anchors protruding from the plate are arranged in the lining space. positioned within the rebar of Here, when the inspection window to which the embedded metal fitting is fixed is slid along the slide frame, the inspection window can be moved without load by operating the chain attached to a part of the inspection window with a lever hoist, chain block, or the like. slide can be realized.

In another aspect of the lining center according to the present invention, the embedded metal fitting has a plate and an anchor attached to the plate,
A mounting opening is provided in the inspection window,
The embedded metal fitting is placed on the inspection window, and the embedded metal fitting is fixed to the inspection window through the mounting opening by a fixing jig arranged on the back surface of the inspection window on the tunnel side. characterized by
According to this aspect, since the embedded metal fitting is fixed to the inspection window by the fixing jig, the embedded metal fitting can be efficiently and firmly fixed to the inspection window. Problems such as slippage of embedded metal fittings due to lateral pressure from concrete filled in will not occur.

In another aspect of the lining center according to the present invention, the embedded metal fitting is attached with a pull-in bracket having a first bolt hole,
The fixing jig includes at least a vertical position adjusting metal fitting for adjusting the vertical position of the embedded metal fitting with respect to the inspection window, a frame-shaped metal washer housing the vertical position adjusting metal fitting, and a bridging piece. cage,
The vertical position adjustment fitting includes a piece to be pulled in which a fixing bolt is screwed and which has a second bolt hole, a screw rod fixed in a state crossing the piece to be pulled in, and a threaded rod screwed into the screw rod. a mating nut and a
The bridging piece is inserted into insertion openings formed in a pair of opposing side surfaces of the metal washer and is bridging between the pair of side surfaces,
The vertical position adjusting metal fitting is accommodated in the frame-shaped metal washer. At this time, a part of the piece to be drawn projects from the metal washer to the retracting bracket side, and the threaded rod extends from the top of the metal washer. It is designed to fit into the accommodation groove opened on the surface,
The first bolt hole and the second bolt hole are aligned, a bolt is inserted and bolted, and the fixing bolt of the vertical position adjusting metal fitting is screwed in to push the bridging piece. The embedded metal fitting is fixed to the inspection window by.
According to this aspect, the fixing jig includes at least the vertical position adjusting metal fitting, the washer metal fitting, and the bridging piece, and the vertical position adjusting metal fitting housed in the washer metal fitting is fixed to the embedded metal fitting and inserted into the washer metal fitting. By pushing the fixing bolt of the vertical position adjusting metal fitting into the bridging piece, the embedded metal fitting can be firmly fixed to the inspection window by the fixing jig.

In another aspect of the lining center according to the present invention, a position adjustment marking is applied to the tunnel-side rear surface of the plate of the embedded fitting,
A position adjustment opening is provided in the inspection window,
When the embedded metal fitting is placed on the inspection window, the position adjustment marking is visible from the inside of the tunnel through the position adjustment opening,
The installation position of the embedded metal fitting with respect to the inspection window is specified based on the relative position of the position adjustment marking with respect to the position adjustment opening.
According to this aspect, by visually checking the relative position between the position adjustment marking provided on the back surface of the plate of the embedded metal fitting and the position adjustment opening provided in the inspection window, the two positions of the embedded metal fitting with respect to the inspection window can be confirmed. Dimensional misalignment can be identified.
For example, as an example of the position adjustment marking, there is a center C1 of the plate and a horizontal line and a vertical line that intersect with this center C1. On the other hand, as an example of the position adjustment opening, a diamond-shaped opening can be mentioned, and the intersection of two diagonal lines (a horizontal diagonal line and a vertical diagonal line) of the rhombus can be set as the center C2 of the inspection window. According to this example, it is possible to accurately specify both the amount of deviation of the center C1 of the plate, more specifically, the amount of deviation in the height direction and the amount of deviation in the lateral direction from the center C2 of the inspection window.

In another aspect of the lining center according to the present invention, when adjusting the position of the embedded metal fitting with respect to the inspection window, the tightening of the nut is adjusted to change the relative position of the nut with respect to the screw rod. Thereby, the vertical position of the embedded metal fitting with respect to the inspection window is adjusted.
According to this aspect, the vertical position of the embedded metal fitting with respect to the inspection window can be adjusted by tightening or loosening the nut abutting on the top surface of the washer metal fitting with respect to the screw rod forming the vertical position adjusting metal fitting. can be easily done. The horizontal position of the metal fitting with respect to the inspection window can be adjusted, for example, by manually moving the metal fitting in the horizontal direction by an operator.

In another aspect of the lining center according to the present invention, when the metal washer is installed in the mounting opening, a part of the mounting opening is formed with an extra opening that is not blocked by the plate. is,
The fixing jig further includes a hole-filling metal fitting that closes the extra opening,
A protruding piece protrudes laterally from the side surface of the metal washer, and the hole-filling metal fitting is fixed to the protruding piece.
According to this aspect, the fixing jig further has a hole-filling metal fitting that closes an extra opening that is not closed by the plate, which is formed when the washer metal fitting is installed in the mounting opening, so that the mounting space can be filled. It is possible to prevent the filled concrete from leaking inside the center form from the extra opening. It should be noted that, for example, when the amount of displacement of the embedded metal fitting with respect to the inspection window cannot be adjusted, the planar dimension of the extra opening changes according to the amount of displacement. Therefore, it is preferable to prepare a hole-filling metal fitting capable of closing a plurality of expected extra openings having planar dimensions.

In another aspect of the lining center according to the present invention, the plate included in the embedded fitting is a flat plate,
The inspection opening of the center form is formed in a flat surface,
A part of the plate is in surface contact with the inspection opening.
According to this aspect, when the plate of the embedded metal fitting is a flat plate, the inspection opening of the central form on which this plate is installed is formed in the flat surface. The embedded metal fittings can be precisely installed without any gaps. In addition, when constructing a tunnel with a curved inner air surface, the entire surface of the center form (skin plate) also basically has a curved surface corresponding to the inner air surface of the tunnel, In this aspect, the portion of the inspection opening of the curved center form is formed as a flat surface.

As can be understood from the above description, according to the lining center of the present invention, when constructing the tunnel lining using the center, the embedded metal fittings can be installed accurately and efficiently.

1 is a cross-sectional view showing a part of an example of a lining center according to an embodiment; FIG. It is a figure which shows the structural member of a fixing jig, an inspection window, and an embedding metal fitting. FIG. 4 is a front view showing a state in which a vertical position adjusting metal fitting is accommodated in a metal washer forming a fixing jig and placed on an inspection window; FIG. 4 is a side view showing a state in which a vertical position adjusting metal fitting is accommodated in a washer metal fitting that constitutes a fixing jig and is placed on an inspection window; FIG. 4 is a plan view showing a relative positional relationship between an inspection window and an embedded metal fitting; FIG. 3B is a view corresponding to FIG. 3A and is a front view showing a state in which a hole-filling metal fitting that constitutes the fixing jig is attached; FIG. 3C is a view corresponding to FIG. 3B and is a side view showing a state in which a hole-filling metal fitting that constitutes the fixing jig is attached; FIG. 5B is a view corresponding to FIG. 5A , and is a front view showing a state in which a bridging piece constituting a fixing jig is attached, a fixing bolt is tightened, and the embedding metal fitting is fixed to the inspection window by the fixing jig. It is a diagram. FIG. 4 is a top view showing a state in which an embedded metal fitting is fixed to an inspection window by a fixing jig; FIG. 10 is a schematic diagram showing a situation in which an embedded fitting positioning gauge is being removed from an inspection window; FIG. 4 is a schematic diagram showing a situation in which an inspection window is installed in an inspection opening and a moving table on which the inspection window is mounted is fixed to slide rails;

Hereinafter, a lining center according to an embodiment will be described with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[The lining center according to the embodiment]
An example of a lining center according to an embodiment will be described with reference to FIGS. 1 to 8. FIG. Here, FIG. 1 is a cross-sectional view showing a part of an example of the lining center according to the embodiment, and FIG. 2 is a diagram showing constituent members of a fixing jig, an inspection window, and an embedded fitting. 3A and 3B are respectively a front view and a side view showing a state in which the vertical position adjusting metal fitting is accommodated in the washer metal fitting constituting the fixing jig and placed on the inspection window. Moreover, FIG. 4 is a plan view showing the relative positional relationship between the inspection window and the embedded metal fitting. 5A and 5B are a front view and a side view, respectively, showing a state in which a hole-filling metal fitting that constitutes a fixing jig is attached. Further, FIGS. 6A and 6B each show a front view of a state in which a bridging piece constituting a fixing jig is attached, a fixing bolt is tightened, and the embedding metal fitting is fixed to the inspection window by the fixing jig. FIG. FIG. 1 shows an area on the right side of the lining center, which is an area above the invert. In FIG. state.

The lining center 100 has a gate-shaped gantry 10 and a center form 20 supported by support members 25, 26, 27 extending vertically, horizontally, and obliquely from the gantry 10. As shown in FIG. The gantry 10 is a gate-type movable platform, and FIG. 1 shows its upper right portion. Wheels (not shown) are provided at the lower ends of the legs 11 forming the gantry 10 so that the gantry 10 can move along rails (not shown) laid on the bottom of the tunnel T in the longitudinal direction of the tunnel T. It has become.

The center foam 20 is formed by a group of foams 21 arranged in the circumferential and longitudinal directions of the tunnel T. As shown in FIG. The central form 20 has a length of, for example, about 10 m in the longitudinal direction of the tunnel T, and a gable formwork (not shown) is provided at the longitudinal end of the tunnel T in the central form 20 .

Before the lining center 100 reaches the inner side of the hole wall, for example, a horseshoe-shaped or circular hole formed by blasting, mechanical excavation, or the like, lining reinforcing bars extending in both the circumferential direction and the longitudinal direction of the tunnel T are placed. R is laid. Then, as shown in FIG. 1, when the lining center 100 arrives, a casting space S is formed between the center form 20 and the hole wall where the lining concrete is cast. When shotcrete is applied to the inner peripheral surface of the hole wall, a placement space S is formed between the center form 20 and the shotcrete.

A plurality of inspection openings 22 are opened in the central form 20.例文帳に追加The inspection port 22 is an opening through which the tip of a hose for placement (not shown) extending in the tunnel T passes through to face the placement space S and for placing concrete in the placement space S. , an opening for inserting a vibrator into the placing space S, and an opening for checking the condition of placing concrete.

The lining center 100 installs the embedding fitting 60 in the inspection port 22 at a desired position among the plurality of inspection ports 22 opened in the center form 20, and then pours concrete into the placement space S. It is a center for fixing the embedded fitting 60 to the lining concrete by being provided. That is, the formwork for lining concrete is formed with the embedded metal fittings 60 fixed at desired positions.

The lining center 100 shown in FIG. It is configured so that an embedded metal fitting 60 can be installed. Specifically, a slide frame 40 is provided near each inspection port 22 , and an inspection window 50 is slidably attached to the slide frame 40 . The inspection opening 22 in which the embedded metal fitting 60 is installed is not limited to the illustrated example, and a unique slide frame 40 is provided in the vicinity of each inspection opening 22 in which the embedded metal fitting 60 is installed.

The slide frame 40 has a slide rail 41 and a movable table 42 having wheels that slide along the slide rail 41 , and an inspection window 50 is fixed to the movable table 42 . The slide rail 41 has one end fixed to the gantry 10 and the other end fixed to the center form 20 in the vicinity of the inspection opening 22 . When the movable table 42 to which the inspection window 50 is fixed moves in the X2 direction (or the X4 direction) along the slide rail 41 and is positioned at the inspection opening 22, the inspection window 50 faces the inspection opening 22. , the installation angle of the slide rail 41 is adjusted.

Suspension rails 30 extending in the longitudinal direction of the tunnel T are attached to the central form 20 in the vicinity of each inspection opening 22 . The suspension rail 30 is made of shaped steel such as H-shaped steel, and a chain block 32 is slidably attached to the suspension rail 30 .

The embedded metal fitting 60 of the illustrated example has a steel flat plate 61 and a plurality of anchors 62 connected to one side surface of the plate 61 by welding or the like. A hanging jig may be fixed to the side surface of the plate 61 on the inner hollow side of the tunnel (the side surface opposite to the side surface to which the anchor is attached), or nothing may be fixed. indicates the latter. If nothing is fixed to the side surface of the plate 61, arbitrary equipment and facilities are fixed by welding or the like when the tunnel is completed, for example. In addition, the embedded metal fitting is not limited to the form of the illustrated example, and may have at least an anchor embedded in the lining concrete.

The embedded metal fitting 60 is fixed to the inspection window 50 by a fixing jig 70. For example, a part of the fixing jig 70 is engaged with a hook at the tip of a chain hanging down from the chain block 32 and suspended. Then, the chain block 32 moves along the suspension rail 30 in the longitudinal direction of the tunnel T, and is positioned near the inspection opening 22 where the embedded metal fitting 60 is to be installed.

The inspection window 50 , which is suspended from the chain block 32 positioned near the inspection opening 22 , and to which the embedded metal fitting 60 is fixed via the fixing jig 70 , is placed in the X1 direction (or X3 direction) with respect to the moving table 42 . direction), and the inspection window 50 is fixed to the moving table 42 .

A lever hoist 43 is attached to the gantry 10 , and a chain extending from the lever hoist 43 is fixed to the moving table 42 . By operating the lever hoist 43, the movable table 42 to which the inspection window 50 is fixed can be moved along the slide rail 41 in the X2 direction (or the X4 direction). By positioning the inspection window 50 in the inspection opening 22, the embedded metal fitting 60 fixed to the inspection window 50 can be faced to the placement space S.

A pin hole 44 is formed in the slide rail 41, and a pin 82 such as a bolt is inserted into the pin hole 44 with the inspection window 50 installed in the inspection opening 22, thereby fixing the position of the moving table 42. be able to.

As shown in FIG. 2, the fixing jig 70 includes a vertical position adjusting metal fitting 71 for adjusting the vertical position of the embedded metal fitting 60 with respect to the inspection window 50, a frame-shaped washer metal fitting 72 in which the vertical position adjusting metal fitting 71 is accommodated, It has a bridging piece 73 and a hole-filling fitting 74 .

The vertical position adjusting metal fitting 71 is fixed in a state in which it intersects with a piece 71c to be pulled in which a fixing bolt 71d is screwed and has a second bolt hole 71e (in the illustrated example, it is orthogonal). and a nut 71b screwed onto the screw rod 71a. The piece to be drawn 71c is, for example, made of steel and has a U-shape formed by bending an elongated plate. 71c.

On the other hand, the frame-shaped metal washer 72 has a top surface 72a with an accommodating groove 72e, a pair of opposing side surfaces 72b, and a slit 72c therein. In addition, each of the pair of side surfaces 72b has an insertion opening 72d, and a bridging piece 73 is inserted into both of the insertion openings 72d to bridge the pair of side surfaces 72b. Two key-shaped engagement grooves 72b' are provided at intervals on each of the ends of the pair of side surfaces 72b. Further, a projecting piece 72f that projects sideways is attached to one side surface 72b, and a bolt 72g is inserted through a bolt hole (not shown) formed in the projecting piece 72f.

The vertical position adjusting metal fitting 71 is accommodated in the slit 72c of the washer metal fitting 72. At this time, a part of the retracted piece 71c protrudes from the slit 72c of the metal washer metal fitting 72 toward the embedded metal fitting 60, and the screw rod 71a extends from the top surface. It fits into a housing groove 72e opened in 72a. As shown in FIGS. 3A and 3B, the nut 71b is positioned above the top surface 72a when the screw rod 71a is fitted in the receiving groove 72e. By adjusting the relative position of the nut 71b, the position of the pulled-in piece 71c can be moved up and down in the X5 direction inside the slit 72c.

The inspection window 50 has a flat plate 51 that is rectangular (square or rectangular) in plan view, a frame 52 along the outer contour of the plate 51 , and two locking bars 53 attached inside the plate 51 . As shown in FIG. 3B, when the metal washer 72 is attached to the back surface of the inspection window 50, the locking grooves 72b' of the side surfaces 72b are fitted to the two locking bars 53. As shown in FIG.

Further, as shown in FIG. 3A, mounting openings 54 which are rectangular in plan view are formed on the left and right sides of the plate 51, and metal washers 72 are arranged so as to straddle the mounting openings 54. As shown in FIG. there is At the central position of the plate 51, a diamond-shaped position adjustment opening 55 is formed in plan view.

Returning to FIG. 2, the embedded metal fitting 60 includes a flat plate 61, a plurality of anchors 62 connected to one side of the plate 61 by welding or the like, and the other side of the plate 61 via bolts. and a retraction bracket 63 which Two pull-in brackets 63 are provided on the other side of the plate 61 at positions corresponding to the left and right mounting openings 54 formed in the plate 51 having the inspection window 50 . Then, the second bolt hole 71e opened in the piece to be pulled 71c projecting through the mounting opening 54 and the first bolt hole 63a opened in the pull-in bracket 63 are aligned, and the bolt 81 is inserted. As a result, the fixing jig 70 and the embedded metal fitting 60 are joined with bolts.

As shown in FIG. 4, when the metal fitting 60 is placed on the inspection window 50, the center C1 of the plate 61 and the center C2 of the plate 51 may deviate. The fact that both centers C1 and C2 are out of alignment means that the installation position of the embedded metal fitting 60 with respect to the inspection opening 22 is out of alignment. Therefore, the embedded metal fitting 60 and the inspection window 50 are provided with means for identifying this deviation.

Specifically, positioning markings 61a and 61b are applied to the tunnel-side rear surface of the plate 61 of the metal fitting 60. As shown in FIG. The position adjustment marking 61a is the X-axis line, the position adjustment marking 61b is the Y-axis line, and the intersection of both is the center C1 of the plate 61. As shown in FIG. On the other hand, the lozenge-shaped position adjustment opening 55 formed in the plate 51 of the inspection window 50 has a horizontal diagonal line 55a and a vertical diagonal line 55b. becomes.

As shown in FIG. 4, when the embedded metal fitting 60 is placed on the inspection window 50, the positioning markings 61a and 61b are visible from the inside of the tunnel through the positioning opening 55. ing.

By measuring the amount of deviation of the center C1 of the plate 61 from the diagonal lines 55a and 55b, it is possible to accurately identify the amount of two-dimensional deviation of the embedded metal fitting 60 from the inspection window 50 (or the inspection opening 22). Become. In FIG. 4, as an example, an example of +20 mm in the horizontal direction and +10 mm in the height direction is shown.

In this way, when the embedded metal fitting 60 is displaced from the inspection window 50, the relative position of the nut 71b with respect to the screw rod 71a is adjusted by turning the nut 71b to the left and right to eliminate the amount of displacement in the height direction. By adjusting, the position of the piece to be drawn 71c is moved up and down in the X5 direction inside the slit 72c. The vertical movement of the pulled-in piece 71c moves the metal fitting 60 fixed via the pulled-in piece 71c up and down, thereby eliminating the amount of deviation in the height direction.

On the other hand, when eliminating the amount of lateral deviation, for example, the worker moves the inspection window 50 and the embedded metal fitting 60 laterally, thereby eliminating the amount of lateral deviation and eliminating the deviation in the height direction. Together with elimination of the amount, it is possible to eliminate the two-dimensional displacement of the embedded metal fitting 60 .

As shown in FIG. 3A, the width of the mounting opening 54 is set wider than the width of the metal washer 72 so that the piece 71c to be pulled in can protrude toward the embedded metal fitting 60 even if the metal washer 72 is slightly misaligned. widely processed. Therefore, when the metal washer 72 is installed on the back surface of the mounting opening 54 , there is a space inside (right side in FIG. 3A) and outside (left side in FIG. 3A) of the metal washer 72 that is not blocked by the metal washer 72 . Openings 54a, 54b are formed. Of these, the inner extra opening 54a is closed by the plate 61 of the embedded fitting 60, but the outer extra opening 54b is not closed by the plate 61, so that the concrete filled in the placing space S flows through the extra opening 54b. There is a risk of leakage.

Therefore, as shown in FIGS. 5A and 5B, a hole-filling metal fitting 74 is arranged in order to block the additional opening 54b, and the back surface of the hole-filling metal fitting 74 is pressed by a protruding piece 72f, and bolt holes ( (not shown) is inserted through the bolt 72g and bolted. Since the size of the extra opening 54b may vary, it is preferable to prepare the hole-filling metal fittings 74 having a plurality of types of expected sizes.

After the additional opening 54b is closed by the hole-filling metal fitting 74, the bridging piece 73 is inserted into the insertion openings 72d formed in the pair of side surfaces 72c of the washer metal fitting 72, as shown in FIGS. 6A and 6B. to bridge between the pair of side surfaces 72c. Then, the embedded metal fitting 60 is fixed to the inspection window 50 by the fixing jig 70 by screwing the fixing bolt 71 d of the vertical position adjusting metal fitting 71 and pushing the bridging piece 73 .

After fixing the embedded metal fitting 60 to the inspection window 50 by the fixing jig 70, as shown in FIG. 7, the embedded metal fitting positioning gauge 56 is removed from the inspection window 50, and as shown in FIG. to slide the inspection window 50 into the inspection opening 22. By inserting the pin 82 into the pin hole 44 of the slide rail 41, the position of the moving table 42 is fixed, and the metal fitting 60 is installed at a desired position.

Here, the plate 61 of the embedded metal fitting 60 in the illustrated example is a flat plate. When the plate 61 installed in the inspection port 22 is flat, if the inspection port provided in the central form 20 having a curved skin plate is similarly curved, it is difficult to install the flat plate 61. In addition, there is a risk that a gap will be created between the two when they are installed. Therefore, in the illustrated example, the inspection opening 22 is formed in a flat surface in the curved central form 20 . With this configuration, the flat plate 61 of the embedded fitting 60 can be precisely installed in the inspection opening 22 of the central form 20 without any gap.

After a predetermined number of embedded metal fittings 60 are installed in the inspection opening 22 at a predetermined position, the placing space S is filled with concrete through other inspection openings 22 in which the embedded metal fittings 60 are not present. The lining concrete is constructed by performing vibrator processing through the inspection opening 22 . When the lining center 100 moves, it is possible to confirm the embedded fitting 60 installed at a predetermined position on the inner peripheral surface of the constructed lining concrete.

According to the illustrated lining center 100, when constructing a tunnel lining using the center, it is possible to efficiently install the embedded fitting 60 at a desired position with high accuracy.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design changes and the like may be made without departing from the gist of the present invention. However, they are included in the present invention.

10: Gantry, 11: Leg, 20: Center form, 21: Form, 22: Inspection opening, 25: Support member, 30: Suspension rail, 32: Chain block, 40: Slide frame, 41: Slide rail, 42 Moving base , 43: lever hoist, 44: pin hole, 50: inspection window, 51: plate, 52: frame, 53: locking bar, 54: mounting opening, 54a, 54b: extra opening, 55: position adjustment opening, 56: Embedded fitting positioning gauge, 60: Embedded fitting, 61: Plate, 61a: Position adjustment marking (X-axis), 61b: Position adjustment marking (Y-axis), 62: Anchor, 63: Retracting bracket, 63a: Third One bolt hole 70: Fixing jig 71: Vertical position adjusting metal fitting 71a: Screw rod 71b: Nut 71c: Pulled-in piece 71d: Fixing bolt 71e: Second bolt hole 72: Metal washer 72a : Top surface 72b: Side surface 72c: Slit 72d: Insertion opening 72e: Accommodating groove 72f: Overhang piece 72g: Bolt 73: Bridge piece 74: Filling metal fitting 81: Bolt 82: Pin 100: Center for lining, G: Ground, R: Rebar for lining, S: Placement space, T: Tunnel, C1, C2: Center

Claims (7)

A lining center applied when placing lining concrete for a tunnel,
The lining center has a gantry and a center foam supported by the gantry,
The center form has an inspection opening, a slide frame is provided in the vicinity of the inspection opening, and an inspection window is slidably attached to the slide frame,
An embedded fitting having at least an anchor is fixed to the inspection window, and the embedded fitting is installed in the inspection opening by moving the inspection window along the slide frame. . The embedded metal fitting has a plate and an anchor attached to the plate,
A mounting opening is provided in the inspection window,
The embedded metal fitting is placed on the inspection window, and the embedded metal fitting is fixed to the inspection window through the mounting opening by a fixing jig arranged on the back surface of the inspection window on the tunnel side. The lining center according to claim 1, characterized by: A pull-in bracket having a first bolt hole is attached to the embedded fitting,
The fixing jig includes at least a vertical position adjusting metal fitting for adjusting the vertical position of the embedded metal fitting with respect to the inspection window, a frame-shaped metal washer housing the vertical position adjusting metal fitting, and a bridging piece. cage,
The vertical position adjustment fitting includes a piece to be pulled in which a fixing bolt is screwed and which has a second bolt hole, a screw rod fixed in a state crossing the piece to be pulled in, and a threaded rod screwed into the screw rod. a mating nut and a
The bridging piece is inserted into insertion openings formed in a pair of opposing side surfaces of the metal washer and is bridging between the pair of side surfaces,
The vertical position adjusting metal fitting is accommodated in the frame-shaped metal washer. At this time, a part of the piece to be drawn projects from the metal washer to the retracting bracket side, and the threaded rod extends from the top of the metal washer. It is designed to fit into the accommodation groove opened on the surface,
The first bolt hole and the second bolt hole are aligned, a bolt is inserted and bolted, and the fixing bolt of the vertical position adjusting metal fitting is screwed in to push the bridging piece. 3. The lining center according to claim 2, wherein the embedded metal fitting is fixed to the inspection window by a. Position adjustment markings are applied to the tunnel-side rear surface of the plate of the embedded fitting,
A position adjustment opening is provided in the inspection window,
When the embedded metal fitting is placed on the inspection window, the position adjustment marking is visible from the inside of the tunnel through the position adjustment opening,
4. The lining center according to claim 2 or 3, wherein the installation position of the embedded fitting with respect to the inspection window is specified based on the relative position of the position adjustment marking with respect to the position adjustment opening. . When adjusting the position of the embedded metal fitting with respect to the inspection window, the tightening of the nut is adjusted to change the relative position of the nut with respect to the screw rod, thereby adjusting the vertical position of the embedded metal fitting with respect to the inspection window. The lining center according to claim 4, characterized in that it is When the metal washer is installed in the mounting opening, a part of the mounting opening is formed with an extra opening that is not closed by the plate,
The fixing jig further includes a hole-filling metal fitting that closes the extra opening,
The lining center according to any one of claims 3 to 5, wherein the hole-filling fitting is fixed to an overhanging piece projecting laterally from the side surface of the washer fitting. the plate of the embedded metal fitting is a flat plate,
The inspection opening of the center form is formed in a flat surface,
The lining center according to any one of claims 2 to 6, wherein a portion of the plate is in surface contact with the inspection opening.

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