JP6181417B2 - Closure structure and closure part construction method - Google Patents

Description

  For example, the present invention relates to a structure and a construction method of a closing portion in an underground structure in which a long and substantially rectangular lining element is inserted and constructed in a natural ground while being sequentially connected.

  Conventionally, there is a connection crossing direction that intersects the connection direction, and a fitting joint having a substantially C-shaped cross-section along the longitudinal direction that is disposed at a predetermined interval in the connection direction, and is long in the insertion direction. In addition, the lining element having a substantially rectangular cross section is inserted and connected to the ground in the longitudinal direction while being fitted to the fitting joint of the preceding element, which is the other lining element previously inserted, and the lining is performed. The applicant has proposed a number of underground structures constructed by filling concrete inside the element.

  In this way, the underground structure constructed by inserting the lining element into the ground while being connected to the preceding element is configured so that external force acting on the structure can be transmitted by the fitting joint. The element itself can be used as a body structure. Therefore, the above-mentioned structure can perform construction with high efficiency compared with other structures using, for example, a member inserted in a natural ground as a temporary structure for protection.

  In such an underground structure, a lining element called a reference element is inserted first, and starting from the reference element, lining elements with equal cross-sectional dimensions called standard elements are sequentially inserted and connected. Build a structure.

  In addition, when constructing an underground structure whose cross section is closed in the structure cross-sectional direction orthogonal to the insertion direction, a closed portion formed between the standard elements sequentially inserted is, for example, Patent Document 1 Are connected with a closing lining element called an adjustment element as shown in FIG.

  Thus, the adjustment element as shown in Patent Document 1 includes a cage-shaped member assembled with a substantially U-shaped reinforcing bar having a fitting joint in the longitudinal direction, and acts as an external force similar to the lining element. Can be transmitted.

  However, since the adjustment element is constructed in a narrow work space in a closed space formed by excavating while being surrounded by a cover plate called a protective member, the workability is low and further improvement in efficiency is not possible. It was difficult.

JP 2002-115497 A

  Therefore, the present invention is constructed by inserting and connecting the lining element along the longitudinal direction while being fitted to the fitting joint of the preceding element which is the other lining element inserted earlier. An object of the present invention is to provide a closed part structure and a closed part construction method capable of efficiently constructing a closed part structure in an underground structure.

The present invention has a connection crossing direction that intersects the connection direction, and a long and substantially cross-sectional fitting fitting that has a substantially C-shaped cross-section along the longitudinal direction and that is disposed at a predetermined interval in the connection direction. Insert the rectangular lining element into the ground along the longitudinal direction while fitting it into the fitting joint of the preceding element, which is the other lining element inserted earlier, and connect the concrete inside the lining element. In the underground structure constructed by filling the structure, in the structural cross-sectional direction orthogonal to the longitudinal direction, connecting the closed portion formed between the preceding elements arranged at intervals in the connecting direction a closure unit structure closing the disposed connection orientation in spaced, the leading element of the sides constituting the closing part and closure part configuration element, so as to straddle the closure part, Comprising a serial closure structure rebar disposed over the closure in both closure portion configured elements constituting the portion, the closure structure reinforcement, and elements within the rebar Haisuji in the closure part configuration element, the reinforcing steel within the element Connected and configured with a closing portion reinforcing bar arranged in the closing portion, and the reinforcing bar in the element is separated from the connecting portion facing the closing portion in the closing portion constituting element at a predetermined interval in the connecting crossing direction. In addition, it is formed in a substantially concave shape having two connecting direction portions along the connecting direction, and the closing portion reinforcing bars are connected to each connecting direction portion of the in-element reinforcing bars or each closing portion constituting the closing portion. It consists of two along the connecting direction to connect with the connecting direction part of the rebar in the element in the component constituting element, and in the element Each open side end of the connecting direction portion of the bars and each end of the closing part reinforcing bar are connected by the connection joint, and the element internal reinforcing bar and the closing part reinforcing bar form a substantially closed loop shape, The closing portion can be constituted by the closing portion and the concrete placed inside the closing portion constituting element, the closing portion reinforcing bar, the element internal reinforcing bar, and the closing portion constituting element .

  The connecting direction is, for example, a linear direction when connecting in a straight line from the reference element in the structure cross-sectional direction, a curved direction when connecting along a curve, or a conventional connection at a corner or a cross-section changing portion. It can be a direction that intersects the direction. In addition, a structure cross-sectional direction can be made into the direction along the cross section of the structure which cross | intersects with respect to the longitudinal direction of a lining element, ie, the insertion direction to a natural ground.

The connection crossing direction is a direction crossing the connection direction in the structure cross-sectional direction, and is a direction corresponding to a height or a width of a member sharing a load.
The substantially rectangular cross section is not only a rectangular cross section and a square, but also includes a trapezoid whose surface in the connecting direction is inclined, and further includes an arch shape that forms a circle or a horseshoe shape by connecting.

  Underground structures can be various structures such as underpasses, tunnels, or abutments. Furthermore, in the cross-sectional direction of the structure, rectangular cross-sections, horizontal cross-sections or cross-sections, and gates can be used. Various cross-sectional shapes that are continuous by connection, such as a mold cross section, an inverted T-shaped cross section, or a single gate shape, can be obtained.

For example, an underground structure having a rectangular cross-sectional shape in which the cross-sectional shape of the structure is a closed loop is formed by connecting the closed portions formed between the preceding elements and closing in the cross-sectional direction perpendicular to the longitudinal direction. When constructing, the reference element is the starting point, and the lining elements are inserted on both sides while sequentially connecting along the cross-sectional shape, and the inserted lining elements are connected to form a transverse shape. Although it is between the inserted lining elements in the continuous state, for example, in a structure whose cross-sectional shape is not a closed loop shape, the lining elements may be inserted from both ends.
The substantially concave shape includes various substantially concave shapes such as a substantially U-shape, a substantially U-shape, and the like, which are configured by connecting ends on one side of two coupling direction portions along the coupling direction. .

  According to the present invention, the lining element is inserted into the natural ground along the longitudinal direction while being fitted to the fitting joint of the preceding element which is the other lining element previously inserted, and is connected and constructed. The closed part structure in the intermediate structure can be constructed efficiently.

Specifically, a closed structural reinforcing bar is disposed between both closed part constituting elements that constitute the closed part so as to straddle the closed part, and the closed structural reinforcing bar is spaced a predetermined distance in the connecting crossing direction. In addition, by forming a substantially concave shape having two connecting direction portions along the connecting direction, and connecting the ends with a connecting joint to form a substantially closed loop shape, the acting external force can be applied to other linings. The closed part structure that can be transmitted to the element can be easily constructed even in a narrow work space in the closed part space. Therefore, the efficiency can be further improved by high workability.

Further, the closure structure reinforcement, and closure part configuration element rebar Haisuji in the closure part configuration element, as well as connected with the closure part configuration element reinforcing bars, constituted by a closure unit rebar Haisuji said closure portion The closing portion constituting element reinforcing bar has two connecting direction portions along the connecting direction, with a predetermined interval in the connecting intersecting direction at a connecting surface facing the closing portion in the closing portion constituting element . It is formed in a substantially concave shape, and the closing part rebar is connected to each connecting direction part of the closing part constituting element reinforcing bar, or the connecting direction part of the closing part constituting element reinforcing bar in each closing part constituting element constituting the closing part. is configured to be connected to, in the structural cross-sectional direction, Ryaku閉Lou between the closure part configuration element reinforcing bars and the closure portion reinforcing bar By configuring the Jo rebar, the closure part structure capable of transmitting an external force acting on the other lining elements, even a narrow working space of closure unit space, can be more easily construction.

For more information, constituting said closing structure rebar, in the closure part configuration element rebar Haisuji in the closure part configuration element, as well as connected with the closure part configuration element reinforcing bars, the closure unit rebar Haisuji said closure portion And, at the connecting surface facing the closing portion in the closing portion constituting element , the closing portion constituting element reinforcing bar is separated by a predetermined interval in the connecting cross direction, and two connecting direction portions along the connecting direction are provided. The closed portion rebar is formed in a substantially concave shape, and the closing portion constituting element reinforcing bar is connected to each connecting direction portion of the closing portion constituting element reinforcing bar or the closing portion constituting element reinforcing bar in each closing portion constituting element constituting the closing portion. is configured to be connected to a portion, in the structure cross-sectional direction, Ryaku閉between the closure part configuration element reinforcing bars and the closure portion reinforcing bar By configuring the-loop-shaped reinforcing bars, even narrow work space that closure unit space, it can be workability is improved, more easily construction.

Further, the front Symbol closure portion reinforcing bar, the connection with the respective connecting direction portion of the closure portion configured element reinforcing bars in each closure part configuration elements constituting the closure part, as well as composed of two along the connecting direction, wherein Each open side end of the connecting direction portion of the closing part constituting element reinforcing bar and each end of the closing part reinforcing bar are connected by the connecting joint, and the closing part constituting element reinforcing bar and the two in each closing part constituting element are connected. By providing the connecting joint that constitutes the closed-loop reinforcing bar with the closing part reinforcing bar, a closing part structure capable of transmitting the acting external force to other lining elements can be realized with a simpler structure. Therefore, the workability can be further improved and the efficiency can be further improved. Moreover, since it is a simple structure, a construction mistake can be prevented and a closed part structure with stable quality can be constructed.

As an aspect of the present invention, a passage hole that allows passage of the connection joint can be provided in the connection surface.
According to the present invention, the closed portion structure can be constructed more efficiently. Specifically, the passage of the connecting joint that connects the closing portion constituent element reinforcing bar arranged in the closing portion constituting element and the closing portion reinforcing bar arranged in the closing portion space via a connecting surface is allowed. By providing a through-hole in the connecting surface, the connection joint passes through the through-hole in the connection work between the closed part constituting element reinforcing bar and the closed part reinforcing bar in the closed part constituting element or in the narrow working space of the closed part space. By doing so, it is possible to move the rebar and work while ensuring a working space. Therefore, the workability of the connection work between the closed portion constituting element reinforcing bars and the closed portion reinforcing bars in a narrow work space is improved, and the work can be performed more efficiently.

Further, the present invention has a long and substantially rectangular cross section having a fitting joint having a substantially C-shaped cross section along the longitudinal direction at a predetermined interval in the coupling direction, intersecting the coupling direction. The lining element is inserted into the ground along the longitudinal direction while being connected to the fitting joint of the preceding element, which is another lining element that has been inserted earlier, and the concrete inside the lining element is filled. In the underground structure to be constructed, it is a closed part construction method in which a closed part constituted between the preceding elements is connected and closed in a structure cross-sectional direction orthogonal to the longitudinal direction, the connecting direction are arranged at intervals in the, as well as the preceding element on both sides constituting the closure portion and closure portion configured elements, so as to straddle the closure portion, both closure which constitutes the closure part In the closure structure rebar disposed over the construction element, and an element in the rebar Haisuji in the closure part configuration element, as well as connected to the said element reinforcing bars, the closure unit rebar Haisuji said closure portion The element internal reinforcing bars are separated from each other by a predetermined interval in the connection crossing direction on the connection surface facing the closing portion in the closing portion forming element, and have two connection direction portions along the connection direction. A connection that is formed in a substantially concave shape and connects the closing portion reinforcing bar to each connecting direction portion of the inner reinforcing bar of the element or to a connecting direction portion of the inner reinforcing bar of each closing portion constituting element constituting the closing portion. constituted by two along the direction, on both sides of the connection cross-direction of the closed case part, so as to straddle both the closure part configuration element, hippopotamus A closure portion excavation process of forming a closure portion space by excavating the closure portion while covering a plate, in the closing portion space, the possible closure portion reinforcing bar connected to the elements within the reinforcing bar is positioned inside the closure part construction element Closed portion distributing bar process for arranging the bars, and a closing surface for arranging the reinforcing bars in the element so as to be parallel to the connecting direction in the connecting surface facing the closing portion of the closing portion constituting element. And connecting each of the open side end portions of the connecting direction portion of the element internal reinforcing bars and the end portions of the closing portion reinforcing bars with connecting joints, and the element internal reinforcing bars in each closing portion constituting element. And the connecting step of forming the closed loop rebar with the two closed portion reinforcing bars, and placing concrete in the closed portion constituting element and in the closed portion space That have rows and concreting step, characterized in that it constitutes the closure portion and the closing portion Da設be concrete, the closing portion reinforcing bars, by the rebar and the closing part constitute elements the element.
Connecting the ends of the above-mentioned closed structural reinforcing bars by connecting joints means that the ends of the closed structural reinforcing bars are directly connected by connecting joints, and each of the cases where the closed structural reinforcing bars are constituted by a plurality of reinforcing bar members is connected. It is a concept including an aspect.

  According to the present invention, the lining element is inserted into the natural ground along the longitudinal direction while being fitted to the fitting joint of the preceding element which is the other lining element previously inserted, and is connected and constructed. The closed part structure in the intermediate structure can be constructed efficiently.

Specifically, the closed part excavation forms the closed part space by excavating the closed part while covering the both sides of the closed part in the connecting crossing direction with the cover plate so as to straddle the closed part constituting elements constituting the closed part. A closed structure reinforcing bar arrangement step for arranging closed structural reinforcing bars arranged over both closed portion constituting elements constituting the closed portion so as to straddle the closed portion, and predetermined in the crossing direction A connecting step of forming a substantially closed loop shape by connecting ends of the closed structural reinforcing bars formed in a substantially concave shape having two connecting direction portions along the connecting direction by connecting joints with a connection joint; by performing the concreting step of setting concrete in the closure portion configured elements inside and the closing portion space, transmitting the external force acting on the other lining elements Friendly The a closure part structure can be easily construction even narrow work space that closure unit space. Therefore, the efficiency can be further improved by high workability.

Further, the closure structure reinforcement, and closure part configuration element rebar Haisuji in the closure part configuration element, as well as connected with the closure part configuration element reinforcing bars, constituted by a closure unit rebar Haisuji said closure portion The closing portion constituting element reinforcing bar has two connecting direction portions along the connecting direction, with a predetermined interval in the connecting intersecting direction at a connecting surface facing the closing portion in the closing portion constituting element . formed in a substantially concave shape, said in closing structure rebar reinforcement step, in the closing portion space, closure part for Haisuji possible closure portion reinforcing bar connected to the closure part configuration element reinforcing bars are disposed in the closure portion configured elements and distribution muscle step, the coupling surface facing said closure portion of the closure part configuration element, the closing section configured elementary formed in a substantially concave shape By performing the closure part configuration element reinforcement step of Haisuji to the rebar parallel portion along the connecting direction, the closure part structure capable of transmitting an external force acting on the other lining elements, closure portion space Even in such a narrow work space, it is possible to construct it more easily and efficiently construct a closed part structure.

Specifically, in the closed structure reinforcing bar reinforcing step, in the closed part space, a closed portion distributing reinforcing step for arranging a closed portion reinforcing bar connectable to the closed portion constituting element reinforcing bar disposed in the closed portion constituting element; and in coupling surface facing said closure portion of the closure part configuration element, the closure part configuration element reinforcement step of Haisuji to the closure part configuration element reinforcing bars formed into a substantially concave shape parallel portions along the connecting direction Thus, even a narrow work space in the closed space can be constructed more easily.

Any of the closing part distributing bar process and the closing part constituent element bar arranging process may be performed first, and further, the rear part of the closing part distributing element process and the closing part constituent element bar arranging process. You may perform a connection process simultaneously with a process.

Further, the front Symbol closure portion reinforcing bars, connected to the respective connecting direction portion of the preceding element reinforcing bars in each preceding element constituting the closure part, constituted by two along the connecting direction, connection of the preceding element reinforcing bars A connecting joint that connects each open side end of the directional portion and each end of the closed portion reinforcing bar, and that forms the closed loop reinforcing bar with the preceding element reinforcing bar and the two closed portion reinforcing bars in each preceding element By providing the above, it is possible to more efficiently construct a closing portion structure capable of transmitting an acting external force to other lining elements.
Specifically, the closing part reinforcing bars are configured by two pieces along the connecting direction, which are connected to each of the connecting direction parts of the preceding element reinforcing bars in each preceding element constituting the closing part, and the connecting of the preceding element reinforcing bars A connecting joint that connects each open side end of the directional portion and each end of the closed portion reinforcing bar, and that forms the closed loop reinforcing bar with the preceding element reinforcing bar and the two closed portion reinforcing bars in each preceding element Therefore, the preceding element bar arrangement step and the connection step can be efficiently performed. Therefore, the workability is improved, and a closed portion structure with stable quality can be constructed.

Further, according to an aspect of the present invention, the connection surface includes a passage hole that allows the connection joint to pass therethrough, and both closing portion constituting elements constituting the closing portion are arranged in a straight line along the connecting direction, A first connecting step of connecting a closing portion constituent element reinforcing step , the inner reinforcing bar of one of the closing portion constituent elements of the two closing portion constituent elements to the closing portion reinforcing bar via the connection joint, and Performing the second connection step of connecting the connection joint, to which the closing portion reinforcing bar is connected, passing through the passage hole to the one side and then connecting to the in- element reinforcing bar of the other closing portion constituting element. it can.

According to this invention, workability can be further improved.
Specifically, the connection surface includes a passage hole that allows the connection joint to pass therethrough, and both closing portion constituting elements that constitute the closing portion are arranged in a straight line along the connecting direction, and the closing portion constituting element is provided. the reinforcement step, a first connecting step of connecting the closure part configuration element reinforcing bars of one said closure part configuration element of the two closure part configuration element, the closure portion reinforcing bar through the connection fitting, the closure portion In order to perform the second connection step of connecting the connecting joint to which the reinforcing bar is connected, passing through the passage hole to the one side and then connecting to the closing part constituting element reinforcing bar of the other closing part constituting element , for example, in narrow closure space, compared with a construction method for connecting the said closure part configuration element rebar closure part configuration element, and a closure portion rebar closure portion space, much workability Improved, it is possible to improve the construction efficiency.

  According to this invention, the lining element is inserted into the natural ground along the longitudinal direction while being fitted to the fitting joint of the preceding element which is the other lining element previously inserted, and connected and constructed. It is possible to provide a closed part structure and a closed part construction method capable of efficiently constructing a closed part structure in an underground structure to be performed.

The schematic perspective view of the underground crossing structure constructed under a track. The schematic front view of the same state. The schematic longitudinal cross-sectional view of the same state. Sectional drawing of an adjustment element. Explanatory drawing about construction of an adjustment element. Explanatory drawing about construction of an adjustment element. Explanatory drawing about construction of an adjustment element. Explanatory drawing about construction of an adjustment element. The schematic perspective view of the adjustment element reinforcing bar of a bar arrangement state. Explanatory drawing about construction of an adjustment element. Explanatory drawing by sectional drawing of the adjustment element of another Example. Explanatory drawing about construction of the adjustment element of another Example. Explanatory drawing about construction of the adjustment element of another Example. Explanatory drawing by sectional drawing of the adjustment element of another Example.

An embodiment of the present invention will be described below with reference to the drawings.
First, an underground underground structure 100 constructed by inserting a lining element 10 made of square steel below a track 200 will be described with reference to FIGS. 1 to 3.

  1 shows a schematic perspective view of the underground crossing structure 100 constructed below the track 200, FIG. 2 shows a schematic front view of the underground crossing structure 100 constructed below the track 200, and FIG. Shows a schematic longitudinal sectional view of the underground crossing structure 100 constructed below the track 200. In FIG. 3, an intermediate portion of the double track 200, that is, an intermediate portion in the insertion direction X is omitted.

  As shown in FIGS. 1 to 3, the track 200 in which the lining element 10 is inserted and the underground crossing structure 100 is constructed below is embanked with a road bed 301 a and a roadbed 301 b on an upper portion of a natural ground 300. The embankment portion 301 is configured, the ballast 302 is compacted on the embankment portion 301, the sleepers 202 are placed at equal intervals in the length direction, and the rails 201 are fixed on the sleepers 202.

  The underground crossing structure 100 constructed in the direction crossing the track 200 (left-right direction in FIG. 3) is a rectangular section box constructed in the natural ground 300 at a position where the upper floor portion 100a becomes a predetermined earth covering. In FIGS. 1 to 3, the underground crossing structure 100 with the connected lining elements 10 exposed is illustrated, but depending on the use of the underground crossing structure 100, the inside of the underground crossing structure 100 is illustrated. The underground crossing structure 100 is completed by constructing pavement and concrete in the space 100d and the end.

The underground crossing structure 100 penetrates the natural ground 300 under the track 200 between the shafts 320 (320a, 320b) constructed by digging up using earth retaining walls (not shown) built in advance on both sides of the track 200 in the transverse direction. It is a structure to do.
And as shown in FIG.1 and FIG.2, the underground crossing structure 100 connects the lining element 10 arrange | positioned in front view horizontally long square shape in the side view rectangular shape, and excavates the inside and is constructed | assembled. .

  As shown in FIG. 2, the lining element 10 is formed in a substantially rectangular shape, is configured to be connectable in the connecting direction Z <b> 1 with a fitting joint 11 described later, and is formed to have a predetermined length. A plurality of lining elements 10 formed to a predetermined length are connected by connecting members (not shown) in the length direction (insertion direction) X, and the length of the underground crossing structure 100 is ensured. is there.

  In addition, in the case of the lining element 10 which comprises the upper floor part 100a and the lower floor part 100b of the underground crossing structure 100, the connection direction Z1 corresponds with the width direction of the underground crossing structure 100, and the side wall of the underground crossing structure 100 In the case of the lining element 10 constituting 100c, it coincides with the height direction of the underground crossing structure 100. Therefore, in the case of the lining element 10 that constitutes the upper floor portion 100a and the lower floor portion 100b of the underground crossing structure 100, the crossing direction Z2 orthogonal to the connection direction Z1 is the same as the height direction of the underground crossing structure 100. In the case of the lining element 10 constituting the side wall 100 c of the underground crossing structure 100, it coincides with the width direction of the underground crossing structure 100.

  Thus, since the underground crossing structure 100 comprised by the lining element 10 which carries out fitting connection of the fitting joints 11 is comprised so that the external force which acts on the constructed underground crossing structure 100 can be transmitted, It is used as a structural member of the main body of the underground underground structure 100, not a temporary structure. Therefore, the distance in the intersecting direction Z2 of the flange plate 12, that is, the length in the intersecting direction Z2 of the web plate 13, is the distance that can withstand the load acting as the upper floor portion 100a, the lower floor portion 100b, or the side wall 100c of the underground crossing structure 100. It consists of Further, the width of the lining element 10, that is, the length in the connecting direction Z <b> 1 of the flange plate 12 is determined by allocating according to the height and width dimension of the underground crossing structure 100 to be constructed.

  The lining element 10 constituting the underground crossing structure 100 includes a standard element 10a used for a general part of the underground crossing structure 100, a reference element 10b that is first inserted into the natural ground 300 when the underground crossing structure 100 is constructed, A corner element 10c used for a corner of the underground crossing structure 100, a closing part constituting element 10d constituting a closing part space H to be described later, and an adjusting element that is inserted lastly and is closed in an annular shape. There are 10e types.

  First, the standard element 10a will be described. As shown in FIG. 2, the standard element 10a includes two flange plates 12 arranged at a predetermined interval in a crossing direction Z2 orthogonal to the connecting direction Z1, and a flange plate. 12 and the web plate 13 facing in the intersecting direction Z2 on both sides of the connecting direction Z1 and having a substantially U-shaped cross section that opens to the base end side in the connecting direction Z1. A spacing plate 14 (see FIG. 4) that holds the spacing in the intersecting direction Z2 of the base end side fitting joint 11b is inserted on the open side in the substantially U-shaped cross section, that is, the base end side in the connecting direction Z1. A plurality are provided in the direction X at predetermined intervals.

  At both ends of the flange plate 12, fitting joints 11 having a substantially C-shaped cross section are provided. Specifically, the base end side fitting joint 11b arranged on the base end side in the connecting direction Z1 of the flange plate 12 is formed in a substantially inverted C shape in a protruding manner outward from the flange plate 12 in the intersecting direction Z2. On the other hand, the distal end side fitting joint 11a disposed on the distal end side in the connecting direction Z1 of the flange plate 12 is formed in a substantially C shape in a protruding manner from the flange plate 12 to the inner side in the intersecting direction Z2. Therefore, the adjacent standard elements 10a are connected by fitting the distal end side fitting joint 11a of the lining element 10 already inserted and the proximal end fitting joint 11b of the standard element 10a to be inserted later. ing.

Further, the web plate 13 is arranged at an appropriate interval in the connecting direction Z1 from the fitting joint 11 on the distal end side and the proximal end side of the flange plate 12.
In the above description, the standard element 10a of the general part constituting the underground crossing structure 100 has been described. However, as shown in FIG. 2, the reference element 10b that is first inserted into the natural ground 300, and the underground crossing structure 100 As will be described below, the corner element 10c constituting the corner portion, the closing portion constituting element 10d disposed on both sides of the adjusting element 10e described later, and the adjusting element 10e inserted lastly and closed in an annular shape are described below. The configuration is slightly different from the standard element 10a in the general part.

  First, the reference element 10b to be inserted into the natural ground 300 includes the front end side fitting joints 11a at both ends of the flange plate 12 in order to sequentially connect the standard elements 10a on the left and right sides with respect to the reference element 10b. 13 are arranged on both sides of the connecting direction Z1 (not shown).

  In the corner element 10c, the connecting direction is orthogonal to the base end side where the base end fitting joint 11b is located, so that the tip end fitting joint 11a is disposed on the extension of the web plate 13 in the intersecting direction Z2. Is done.

  As described above, the closing portion constituting element 10d is connected to the left and right with the reference element 10b as a reference, and as described above, the closing portion constituting the closing portion space H for constructing the adjusting element 10e closing in the cross section of the structure. In the lower floor portion 100b, the web plate 13 is provided on both sides of the distal end side and the proximal end side in the coupling direction Z1, and is connected to the already inserted standard element 10a coupled in the respective right and left coupling directions Z1. Only the proximal end fitting joint 11b is provided, and the distal end side fitting joint 11a facing the closing portion constituting elements 10d is not provided. Instead, a plurality of in-element rebars 20 connected to a closing portion rebar 30 of the adjusting element 10e described later are provided at a predetermined interval in the insertion direction X, and the in-element rebar 20 is closed on the web plate 13 on the distal end side. A plurality of passage holes 13 a that allow passage of the mechanical joint 40 that connects the partial rebar 30 are formed in the insertion direction X corresponding to the rebar 20 in the element.

  The in-element reinforcing bars 20 are laterally configured by a connecting direction portion 20a that is spaced apart in the intersecting direction Z2 and parallel to the connecting direction Z1, and a semicircular portion 20b that connects the base ends of the two connecting direction portions 20a. It is configured in a U shape. The through holes 13a formed in the web plate 13 on the front end side are formed at intervals corresponding to the intervals in the intersecting direction Z2 of the connecting direction portions 20a of the in-element reinforcing bars 20. Further, the interval in the intersecting direction Z2 is set according to the external force acting on the underground crossing structure 100. In this embodiment, the interval in the intersecting direction Z2 is approximately 3 with respect to the height in the intersecting direction Z2. An interval of about / 4 is set.

  On the contrary, the adjustment element 10e that is inserted into the closing part space H formed between the closing part constituent elements 10d at the end and closed in an annular shape is inserted into the closed part constituent element 10d that has been inserted on both the left and right sides. A cover plate 39 arranged so as to straddle the outer surface of the flange plate 12, and a closing part reinforcing bar 30 arranged in a closing part space H formed between the left and right closing part constituting elements 10d and the upper and lower cover plates 39, It consists of. In addition, the closing part reinforcing bar 30 is provided with two or more spaced apart in the insertion direction X similarly to the in-element reinforcing bar 20.

The closing portion reinforcing bar 30 is composed of a U-shaped main reinforcing bar 31, a closed loop-shaped shear reinforcing bar 32 having a rectangular shape in a side view, and a linear force distribution bar 33 arranged along the insertion direction X.
The U-shaped main reinforcing bar 31 has a connecting direction portion 31a parallel to the connecting direction Z1 and two connecting direction portions 31a spaced apart by a predetermined interval in the crossing direction Z2 in the connecting direction portion 20a of the inner reinforcing bar 20 of the element. It is comprised in the horizontal U shape comprised with the cross direction part 31b of the cross direction Z2 which connects the front-end | tip side.
Therefore, the connection direction portion 31 a of the U-shaped main reinforcing bar 31 is an interval corresponding to the interval of the passage holes 13 a formed in the web plate 13.

  Further, the U-shaped main reinforcing bar 31 is provided with two U-shaped main reinforcing bars 31 in one section at predetermined intervals where the in-element reinforcing bars 20 are arranged. 31a is arranged in the direction to be the closing portion constituting element 10d side, and the crossing direction portion 31b side of the two U-shaped main reinforcing bars 31 is configured to have a length that wraps in the connecting direction Z1. In this state, a portion surrounded by the connection direction portion 31a and the cross direction portion 31b of the two U-shaped main reinforcing bars 31 is defined as a wrap portion Rp, and the length of the wrap portion Rp in the cross direction Z2 depends on the rebar diameter. The length is set according to the lap joint length specified.

  In addition, the U-shaped main reinforcing bar 31 configured in this way constitutes a closed-loop reinforcing bar Tr that forms a bullet-type closed loop in a side view when viewed from the front by connecting to the in-element reinforcing bar 20 with a mechanical joint 40.

  The shear reinforcement bars 32 are arranged so as to surround a plurality of U-shaped main reinforcing bars 31 arranged at a predetermined interval in the insertion direction X, and a plurality of shear reinforcement bars 32 are arranged at a predetermined interval in the connecting direction Z1. In the present embodiment, three shear reinforcement bars 32 are arranged with respect to the U-shaped main reinforcing bar 31, and a plurality of U-shaped main reinforcing bars 31 arranged in the insertion direction X are collectively enclosed. It is configured as follows. In addition, a cage rebar 30a (FIG. 6 (a)) is temporarily assembled with three U-shaped main reinforcing bars 31 arranged in a plurality in the insertion direction X and three shear reinforcing bars 32 arranged so as to surround them. b)).

  The distribution bars 33 are linear reinforcing bars that straddle the cage rebars 30a arranged along the insertion direction X along the insertion direction X. In the present embodiment, the section of the wrap portion Rp and the lap portion Rp Five of them are arranged in each of the crossing directions Z2 at a predetermined interval from each of the outer sides of each of them, and a total of ten are provided. In FIG. 8B and FIG. 9, illustration of a plurality of force distribution bars 33 is omitted for easy understanding of the drawings.

Next, a construction method for constructing the underground crossing structure 100 using the standard element 10a, the reference element 10b, the corner element 10c, the closing part constituent element 10d, and the adjustment element 10e configured as described above will be described.
As described above, the underground crossing structure 100 is located below the track 200 between the vertical shafts 320 (320a, 320b) constructed by digging down using earth retaining walls (not shown) built in advance on both sides of the track 200 in the transverse direction. It is a structure that penetrates the natural ground 300, and is constructed by connecting the lining elements 10 arranged in a rectangular shape when viewed from the front in a rectangular shape when viewed from the side, and excavating the inside.

  First, when constructing the underground crossing structure 100, a guide pipe (not shown) is inserted in advance at the insertion position of the reference element 10b at the substantially central position of the upper floor portion 100a, and the reference element 10b is inserted into the two guide pipes. Set the drilling rig or blade attached to the.

  Then, as shown in FIG. 10B, first, a tow wire (not shown) inserted through the guide pipe is towed from the arrival side shaft 320b side, and the reference element 10b is inserted while excavating the natural ground 300, and the reference element This is repeated until the tip of 10b reaches the arrival side shaft 320b, and the insertion of the reference element 10b is completed.

  Next, the standard element 10a is constructed according to the construction procedure described above while the base end side fitting joint 11b is fitted to the distal end side fitting joint 11a of the reference element 10b that has been inserted, and the standard element 10a is applied to the natural ground 300. 10a is inserted. The insertion of the standard element 10a is sequentially repeated in the connecting direction Z1 in both directions of the reference element 10b, that is, outward in the width direction in FIG.

  When the insertion of the standard element 10a in the upper floor portion 100a is completed, the corner element 10c is inserted while the proximal end fitting joint 11b is fitted to the distal end fitting joint 11a of the standard element 10a at the end of the upper floor portion 100a. Then, the standard element 10a constituting the side wall 100c is connected to the connecting direction Z1 that faces downward in FIG. 2 while fitting the base end side fitting joint 11b to the tip side fitting joint 11a of the inserted corner element 10c. Insert them while sequentially connecting them.

  When the insertion of the standard element 10a in the side wall 100c is completed, the corner element 10c is inserted while fitting the base end side fitting joint 11b to the distal end side fitting joint 11a of the standard element 10a at the end of the side wall 100c, The standard element 10a constituting the lower floor portion 100b is directed inward in the width direction in FIG. 2 while the proximal end fitting joint 11b is fitted to the distal end fitting joint 11a of the inserted corner element 10c. Insert while sequentially connecting in the connecting direction Z1.

  When the insertion of the standard element 10a in the lower floor portion 100b is sequentially repeated and the insertion of the standard element 10a before the connecting direction Z1 at both positions of the planned construction position of the adjustment element 10e is completed, the insertion of the inserted standard element 10a on the front end side is performed. The closing portion constituting element 10d that constitutes the closing portion space H is inserted while fitting the proximal end fitting joint 11b to the fitting joint 11a.

Next, a construction method for constructing the adjustment element 10e after the insertion of the closing portion constituting element 10d shown in FIG. 5A is completed will be described with reference to FIGS.
5 to FIG. 8 and FIG. 10 are explanatory diagrams for the construction of the adjustment element 10a, and FIG. 9 is a schematic perspective view of the closing portion reinforcing bar 30 in the bar arrangement state.

  Specifically, FIG. 5 (a) shows a schematic diagram of the state in which the closing element 10d is inserted before the adjustment element 10e is constructed, and FIG. 5 (b) shows that the cover plate 39 is inserted and closed. The schematic of the state which formed the partial space H is shown.

  6A shows a schematic view of a state where the cage rebar 30a is mounted in the closed part space H, FIG. 6B shows a schematic perspective view of the cage rebar 30a, and FIG. 7A shows a closed part space. FIG. 7B is a schematic diagram showing a state in which the element internal reinforcing bar 20 is arranged inside one closing part constituent element 10d among the left and right closing part constituent elements 10d constituting the H, and is connected to the closing part reinforcing bar 30. FIG. 2 shows a schematic perspective view of the cage reinforcing bar 30a and the element internal reinforcing bar 20.

  FIG. 8A shows a schematic diagram of a state in which the element internal reinforcing bar 20 is disposed inside the other closing part constituting element 10d and is connected to the closing part reinforcing bar 30, and FIG. 9 is a schematic perspective view showing a state in which the distribution bar 33 is connected to the cage reinforcing bar 30a. FIG. 9 is a schematic perspective view of the element internal reinforcing bar 20 and the closing part reinforcing bar 30 that are continuous in the insertion direction X in the same state. Is shown. As described above, in FIG. 8B and FIG. 9, the number of the shear reinforcing bars 32 arranged in the cage reinforcing bar 30a is reduced in order to facilitate understanding.

  Fig.10 (a) shows the schematic of the state in which the arrangement | positioning of the closing part reinforcement 30 of the adjustment element 10e connected with the element internal reinforcement 20 arrange | positioned at the closing part structure element 10d was completed, FIG.10 (b) These show the schematic of the state by which concrete was laid in the lining element 10 inside.

  First, as shown in FIG. 8A, when the insertion of the closing portion constituting element 10d on both sides in the width direction of the closing portion space H that constructs the adjustment element 10e is completed, the closing portion space H is formed together with the closing portion constituting element 10d. A blade edge is attached to the tip of the cover plate 39 to be drilled, and the cover plate 39 is inserted while digging along the left and right closing portion constituting elements 10d.

The cover plate 39 has a wide gate-like cross-sectional shape when viewed from the front, and inserts a leg portion provided in the vicinity of the width direction end portion constituting the gate shape along the flange plate 12 outside the closing portion constituting element 10d. .
By inserting the cover plate 39, a closed portion space H surrounded by the closing portion constituting element 10d in the left-right direction, that is, the connecting direction Z1, and the cover plate 39 in the up-down direction, that is, the intersecting direction Z2, can be formed.

  Subsequently, two U-shaped main reinforcing bars overlapped inside the three shear reinforcement bars 32 spaced apart in the connecting direction Z1 so that the open end of each connecting direction portion 31a is on the outside. Three sets of 31 are arranged at predetermined intervals in the insertion direction X to form the cage rebar 30a.

  At this time, the mechanical joint 40 is attached to each end portion on the open side of the connection direction portion 31 a of the U-shaped main reinforcing bar 31. Moreover, the overlap part of the connection direction part 31a in the two overlapped U-shaped main reinforcing bars 31 and the shear reinforcement bars 32 constitute a wrap portion Rp, and the U-shaped main reinforcing bars 31 are connected in the connecting direction Z1. By sliding, the length of the wrap portion Rp, that is, the length in the connecting direction Z1 of the cage rebar 30a is adjustable.

  In this way, the U-shaped main reinforcing bar 31 and the shear reinforcing bar 32 and the mechanical joint 40 assembled in advance are brought into the closed space H, and at a predetermined location, as shown in FIG. The mechanical joint 40 is inserted into the through hole 13a and temporarily arranged.

  Next, it connects with the in-element rebar 20 arrange | positioned at the closure part structure element 10d with the mechanical coupling 40 with which the cage | basket rebar 30a was mounted | worn. In the present embodiment, first, in FIG. 7, after connecting with the element internal reinforcing bar 20 arranged in the closing part constituting element 10d on the left side of the adjusting element 10e, it is connected with the element internal reinforcing bar 20 arranged in the right closing part constituting element 10d. Of course, they may be connected from the right side, or may be connected at the same time on the left and right.

  More specifically, the element internal rebar 20 is connected to a predetermined portion in the closing portion constituting element 10d in such a direction that the open end of the connecting direction portion 20a of the element internal rebar 20 formed in a U-shaped sideways is the web plate 13 side. Bring to position.

  Then, the U-shaped main reinforcing bar 31 of the cage reinforcing bar 30a is shifted to adjust the length of the wrap portion Rp so that the mechanical joint 40 is moved to the adjusting element 10e side. A connection space for connecting the in-element reinforcing bars 20 is secured, and the open end of the connecting direction portion 20 a of the in-element reinforcing bars 20 is connected to the U-shaped main reinforcing bars 31 via the mechanical joint 40. By connecting the in-element reinforcing bar 20 to the U-shaped main reinforcing bar 31, a left-handed shell-type closed loop reinforcing bar Tr that is opposite to the connecting direction Z1 is formed. The in-element reinforcing bars 20 are connected to all the U-shaped main reinforcing bars 31 of the cage reinforcing bars 30a brought in.

  Subsequently, as shown in FIG. 8A, the in-element reinforcing bar 20 is connected to the U-shaped main reinforcing bar 31 in the same manner in the closing portion constituting element 10 d on the right side with respect to the adjusting element 10 e. Also by connecting the in-element reinforcing bar 20 to the U-shaped main reinforcing bar 31, a shell-type closed loop reinforcing bar Tr facing right is formed. The in-element reinforcing bars 20 are connected to all the U-shaped main reinforcing bars 31 of the cage reinforcing bars 30a brought in.

  The connection of the in-element reinforcing bars 20 to the cage reinforcing bars 30a is performed for each of the cage reinforcing bars 30a, and the temporary arrangement of the cage reinforcing bars 30a and the connection of the in-element reinforcing bars 20 at the left and right closing portion constituting elements 10d are performed. Repeat the length corresponding to the length of.

  Subsequently, as shown in FIG. 8B and FIG. 9, the insertion direction with respect to a predetermined portion of the cage rebar 30 a corresponding to the length of the power distribution bar 33 to which the in-element rebar 20 is connected. Arrangement of the X strength bars 33 is performed. FIG. 8B illustrates one cage reinforcing bar 30a, and FIG. 9 illustrates only three cage reinforcing bars 30a among the plurality of cage reinforcing bars 30a arranged in the insertion direction X. Although not shown in FIG. 9, in the insertion direction X, the reinforcing bars 33 are arranged by wrapping the lap joint length corresponding to the reinforcing bar diameter.

  As described above, when the arrangement of the in-element reinforcing bar 20 and the closing part reinforcing bar 30 in the closing part constituting element 10d and the adjustment element 10e is completed (see FIG. 10A), the element is inserted as shown in FIG. 10B. Concrete 50 is placed inside the lining element 10, and after the placed concrete 50 is hardened, the inside of the underground crossing structure 100 is excavated to form an internal space 100d, and the underground crossing structure 100 is completed. Let

  As described above, the underground crossing structure 100 may be completed by building pavement or concrete in the internal space 100d or the end of the underground crossing structure 100 according to the use of the underground crossing structure 100.

  As described above, a long length having the fitting joint 11 having a substantially C-shaped cross section along the insertion direction X, which is disposed at a predetermined interval in the intersecting direction Z2 intersecting the connecting direction Z1 and in the connecting direction Z1. The lining element 10 having a substantially rectangular cross section is inserted and connected to the natural ground 300 along the insertion direction X while being fitted to the front end side fitting joint 11a of the other lining element 10 previously inserted. In the underground crossing structure 100 constructed by filling the concrete 50 inside the lining element 10, the crossing structure perpendicular to the insertion direction X is formed by connecting the closed part space H formed between the closed part constituting elements 10 d. The adjustment element 10e that closes in the surface direction is connected to the element internal reinforcing bar 20 that is arranged in the closing part constituting element 10d and the element internal reinforcing bar 20, and the closing part is empty. The web reinforcing plate 30 facing the closing portion space H of the closing portion constituting element 10d is spaced apart from each other by a predetermined interval in the crossing direction Z2 and the connecting direction Z1. Are formed in a horizontal U-shape having two connecting direction portions 20a along the same direction, and the closed portion reinforcing bars 30 are connected to the connecting direction portions 20a of the in-element reinforcing bars 20, and in the structural cross section direction, By configuring the closed loop reinforcing bar Tr with the inner reinforcing bar 20 and the closing part reinforcing bar 30, the adjustment element 10e in the underground crossing structure 100 can be efficiently constructed.

  Specifically, the element internal reinforcing bar 20 arranged in the closing part constituting element 10d and the element reinforcing bar 20 connected to the element internal reinforcing bar 20 and arranged in the closed part space H are provided. In the web plate 13 facing the closing portion space H in the closing portion constituting element 10d, the web plate 13 is formed in a horizontal U-shape having a predetermined interval in the intersecting direction Z2 and having two connecting direction portions 20a along the connecting direction Z1. The closed portion reinforcing bar 30 is connected to each connecting direction portion 20a of the element internal reinforcing bar 20, and in the structure cross-sectional direction, the element internal reinforcing bar 20 and the closed portion reinforcing bar 30 constitute the closed loop reinforcing bar Tr. The adjustment element 10e capable of transmitting the acting external force to other lining elements 10 is a narrow working space called a closed space H. Also it can be easily construction. Therefore, the efficiency can be further improved by high workability.

  Further, the closed rebar 30 is provided with a substantially U-shaped main reinforcing bar 31 having two connection direction portions 31 a along the connection direction Z <b> 1 connected to each connection direction portion 20 a of the in-element rebar 20. The mechanical joint 40 constituting the closed loop rebar Tr is formed by connecting the open end of the connecting direction portion 20a of the element internal reinforcing bar 20 and the open end of the connecting direction portion 31a of the U-shaped main rebar 31. In the closed part space H, it acts by forming a wrap portion Rp where the U-shaped main reinforcing bars 31 connected to the element internal reinforcing bars 20 of each closed part constituting element 10d constituting the closed part space H wrap. The adjustment element 10e capable of transmitting an external force to the other lining element 10 can be realized with a simpler structure. Therefore, the workability can be further improved and the efficiency can be further improved. In addition, since the structure is simple, construction errors can be prevented, and the adjustment element 10e with stable quality can be constructed.

  Further, by providing the web plate 13 with a passage hole 13a that allows the mechanical joint 40 to pass therethrough, the element internal reinforcing bar 20 and the closing part reinforcing bar in the closed part constituting element 10d and the narrow working space of the closed part space H are provided. In the connection work with 30, the mechanical joint 40 can be moved while passing through the passage hole 13 a to move the reinforcing bar and ensure work space. Therefore, the workability of the connection work between the element internal reinforcing bar 20 and the closing part reinforcing bar 30 in a narrow work space is improved, and the work can be performed more efficiently.

  Further, the adjustment element 10e is excavated while being covered with the cover plate 39 so as to straddle the closing portion constituent element 10d constituting the closing portion space H, thereby forming the closing portion space H. In the closing portion space H, the closing portion configuration is configured. The element internal reinforcing bar 30 is arranged in a substantially concave shape in the web plate 13 facing the closing part space H of the closing part constituting element 10d by arranging the closing part reinforcing bar 30 connectable to the element internal reinforcing bar 20 arranged in the element 10d. 20 is arranged so that the parallel part is along the connecting direction Z1, the closed portion reinforcing bar 30 and the element internal reinforcing bar 20 are connected, and concrete is placed in the closed portion constituting element 10d and in the closed portion space H, thereby covering Adjustment in the underground crossing structure 100 constructed by inserting the work element 10 along the insertion direction X into the natural ground 300 and connecting it The Remento 10e, even narrow working space of closure portion space H can be easily construction, it can be efficiently constructed.

  In addition, both closed portion constituting elements 10d constituting the closed portion space H are arranged in a straight line along the connecting direction Z1, and the U-shaped main rebar 31 formed in a substantially U shape is closed at the open end. It arrange | positions in the symmetrical direction so that it may go to the part structure element 10d, and it arrange | positions it in the closing part space H so that the length of the connection direction Z1 can be adjusted according to the wrap length in the lap | wrap part Rp, and it arrange | positions in the closing part space element H After connecting the inner reinforcing bar 10d of 10d and one U-shaped main reinforcing bar 31 of the two overlapped to form a closed loop-shaped reinforcing bar Tr, the other U-shaped of the two overlapped ones is formed. Since the length of the main reinforcing bar 31 in the connecting direction Z1 is adjusted and connected to the element internal reinforcing bar 20 of the other closing part constituting element 10d to form the closed loop rebar Tr, the arrangement in the closing part constituting element is performed. A connection at the same time, can be efficiently construction. Therefore, the workability is improved and the adjustment element 10e with stable quality can be constructed.

  In addition, two superposed U-shaped main reinforcing bars 31 and element internal reinforcing bars 20 constituting the closed-loop reinforcing bar Tr are arranged at a predetermined interval in the insertion direction X, and the two superposed two are arranged. The U-shaped main reinforcing bar 31 is provided with a shear reinforcing bar 32 that surrounds the insertion direction X, and is closed as a cage reinforcing bar 30a in which the shear reinforcing bar 32 and two superimposed U-shaped main reinforcing bars 31 are temporarily assembled. In order to bring the two U-shaped main reinforcing bars 31 brought into the partial space H and overlap each other in the closed partial space H at a predetermined interval, that is, to bring them into the closed partial space H with temporarily assembled cage reinforcing bars 30a, With respect to a plurality of the two superposed U-shaped main reinforcing bars 31 arranged at a predetermined interval, the two superposed U-shaped main reinforcing bars 31 are inserted in the insertion direction X in a narrow closed space H. Compared to the construction method of assembling and arranging the surrounding reinforcing bar 32 Much workability is improved, it is possible to improve the construction efficiency.

  Further, the web plate 13 is provided with a passage hole 13a that allows the mechanical joint 40 to pass therethrough, and both the closing portion constituting elements 10d constituting the closing portion space H are arranged in a straight line along the connecting direction Z1, and the left side The in-element rebar 20 of the closing portion constituting element 10d is connected to the closing portion rebar 30 through the mechanical joint 40, and the mechanical joint 40 to which the closing portion rebar 30 is connected passes through the passage hole 13a. For example, in the narrow closed part space H, the element internal reinforcing bar 20 of the closed part constituting element 10d and the closed part space H are closed by connecting to the inner reinforcing bar 20 of the right closed part constituting element 10d. Compared with the construction method which connects the partial reinforcement 30, the workability is remarkably improved, and the construction efficiency can be improved.

  In the above embodiment, the U-shaped U-shaped main reinforcing bar 31 and the lateral U-shaped element internal reinforcing bar 20 are connected to form the closed-loop reinforcing bar Tr, and the closed-loop reinforcing bar Tr in the reverse direction is formed. The lap portion Rp is formed by superimposing the two, and the shear reinforcement bars 32 that collectively surround the plurality of closed-loop reinforcing bars Tr and the distribution bars 33 in the insertion direction X are arranged. For example, as shown in FIG. Instead of the U-shaped main reinforcing bar 31, two linear straight main reinforcing bars 34 that connect the ends of the connecting direction portions 20 a of the lateral element internal reinforcing bars 20 may be used.

  When the straight main reinforcing bar 34 is used, the connecting direction portion 20a of the element internal reinforcing bar 20 arranged in the left and right closing portion constituting element 10d and the crossing direction Z2, that is, 2 arranged at a predetermined interval in the vertical direction in FIG. The respective ends of the straight main reinforcing bars 34 are connected by mechanical joints 40, and a horizontally long closed loop reinforcing bar Tr is formed across the adjustment element 10e and extending to the left and right closing portion constituting elements 10d. In addition, as shown to Fig.11 (a), you may form the element internal reinforcement 20 and the straight main reinforcement 34 in the length by which the mechanical coupling 40 is arrange | positioned in the standard element 10a, conversely, FIG. As shown in 11 (b), the element internal reinforcing bar 20 and the straight main reinforcing bar 34 may be formed in such a length that the mechanical joint 40 is within the closing portion constituting element 10d.

A method of constructing the straight main reinforcing bar 34 when such a straight main reinforcing bar 34 is used will be described with reference to FIGS. 12 and 13.
In the following description, first, in FIG. 12, after connecting with the element internal reinforcing bar 20 arranged in the closing part constituting element 10d on the left side of the adjustment element 10e, the element internal reinforcing bar 20 arranged in the right closing part constituting element 10d. Of course, you may connect from the right side.

  First, the element internal rebar 20 is arranged in the closing portion constituting element 10d on the left side with respect to the adjustment element 10e so that the open side end portion of the connecting direction portion 20a is inserted into the passage hole 13a of the web plate 13 and adjusted. The straight main reinforcing bar 34 is connected to the connecting direction portion 20a of the in-element reinforcing bar 20 passing through the passage hole 13a and the mechanical main joint 40 at a predetermined position in the closed portion space H inside the element 10e. At this time, as shown in FIG. 12 (a), the mechanical joint 40 on the right side of the straight main reinforcing bar 34 is inserted into the passage hole 13a of the web plate 13 of the other side, that is, the right side closing element 10d. By connecting the main reinforcing bar 34 to the right side, the connecting direction portion 20a of the in-element reinforcing bar 20 and the straight main reinforcing bar 34 are connected.

  Subsequently, as shown in FIG. 12 (b), the left element inner reinforcing bar 20 and the upper and lower straight main reinforcing bars 34 are shifted to the left side in a connected state, and the element is moved to a predetermined position in the right closing portion constituting element 10d. The inner rebar 20 is disposed, and the open end of the connecting direction portion 20 a is passed through the passage hole 13 a of the web plate 13 and connected to the mechanical joint 40 on the right side of the straight main rebar 34. As described above, the in-element reinforcing bar 20 arranged in the left and right closing portion constituting element 10d and the two straight main reinforcing bars 34 arranged in the adjusting element 10e constitute a closed loop reinforcing bar Tr. A predetermined number of them are formed, and as shown in FIG. 13A, a plurality of shear reinforcement bars 32 are arranged at a predetermined interval in the connecting direction Z1, that is, in the left-right direction. In the present embodiment, four shear reinforcement bars 32 are arranged at predetermined intervals in the crossing direction Z2 with respect to the three closed-loop reinforcing bars Tr arranged in the insertion direction X.

  After assembling a predetermined number of them in the insertion direction X, as shown in FIG. 13 (b), the reinforcing bars 33 in the insertion direction X are arranged at predetermined locations, and this is arranged over the entire length of the adjustment element 10e in the insertion direction X. To complete the arrangement of the element internal reinforcing bar 20 and the closing part reinforcing bar 30 in the closing portion constituting element 10d and the adjusting element 10e. The subsequent placement of the concrete 50 and the construction of the closed part space H are as described above, and thus the description thereof is omitted.

  Thus, each of the connecting direction portions 20a of the in-element reinforcing bars 20 formed in a substantially U shape is connected to the two straight main reinforcing bars 34, and the in-element reinforcing bars 20 and the two in each closing portion constituting element 10d are connected. By providing the mechanical joint 40 that constitutes the closed loop rebar Tr with the straight main rebar 34, the adjusting element 10e that can transmit the acting external force to the other lining elements 10 is realized with a simpler structure. Can do. Therefore, the workability can be further improved and the efficiency can be further improved. In addition, since the structure is simple, construction errors can be prevented, and the adjustment element 10e with stable quality can be constructed.

  Further, for example, as shown in FIG. 14, two long U-shaped reinforcing bars 35 are used in place of the U-shaped main reinforcing bar 31 and the linear straight main reinforcing bar 34. The U-shaped rebars 35 may be arranged symmetrically, and the connection direction portions 35a may be connected to each other by the mechanical joint 40 to form the closed loop rebar Tr. In the following description, the same components as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  More specifically, the long U-shaped reinforcing bar 35 is a lateral U-shape having a connecting direction portion 35a longer than the connecting direction portion 20a of the above-described element internal reinforcing bar 20, and a machine-like portion is provided at the open end of the connecting direction portion 35a. A type joint 40 is provided. The long U-shaped reinforcing bars 35 configured in this way are arranged symmetrically in the left-right direction, and the ends of the coupling direction portions 35a are connected to each other by the mechanical joints 40 in the closed portion space H to form the closed-loop-shaped reinforcing bars Tr. That is, the closed loop rebar Tr constituted by the two long U-shaped rebars 35 includes the element internal rebar 20 arranged in the closing portion constituting element 10d in the above description and the U-shaped main rebar 31 arranged in the adjustment element 10e. It also functions as a straight main rebar 34.

When the long U-shaped reinforcing bar 35 having such a configuration is used, a horizontally long closed portion constituting element 10d ′ having a wider internal space than the conventional closed portion constituting element 10d is used.
In order to construct using the two long U-shaped reinforcing bars 35 and the horizontally long closing portion constituting element 10d ′, first, in FIG. 14B, the horizontally long closing portion constituting element 10d ′ on the left side of the adjustment element 10e is elongated. The U-shaped reinforcing bar 35 is inserted, and the long U-shaped reinforcing bar 35 is arranged in the passage hole 13a of the web plate 13 so as to insert the open end of the connecting direction portion 35a. Then, the long U-shaped reinforcing bar 35 is similarly inserted into the horizontally long closing portion constituting element 10d ′ on the right side of the adjustment element 10e, and the open side end portion of the connecting direction portion 35a is inserted into the passage hole 13a of the web plate 13. Thus, the long U-shaped reinforcing bar 35 is arranged.

  And in the closed part space H inside the adjustment element 10e, the connection direction part 35a edge part of the left and right long U-shaped rebar 35 is connected with the mechanical joint 40, and the closed loop-shaped rebar Tr is comprised. Since the assembly of the other shear reinforcement bars 32 and the distribution bars 33, the subsequent placement of the concrete 50, and the construction of the closed portion space H are as described above, the description thereof is omitted.

  Thus, by connecting the connecting direction portion 35a of the long U-shaped reinforcing bar 35 formed in a substantially U shape by the mechanical joint 40 to form the closed loop-shaped reinforcing bar Tr, the closed-looped reinforcing bar Tr is thus formed. Since the number of reinforcing bars can be reduced, the adjustment element 10e capable of transmitting the acting external force to the other lining elements 10 can be realized with a simpler structure. Therefore, the workability can be further improved and the efficiency can be further improved. In addition, since the structure is simple, construction errors can be prevented, and the adjustment element 10e with stable quality can be constructed.

In the correspondence between the configuration of the present invention and the above-described embodiment, the connection crossing direction corresponds to the crossing direction Z2,
Similarly, the longitudinal direction corresponds to the insertion direction X,
The lining elements correspond to the lining element 10, the standard element 10a, the reference element 10b, the corner element 10c, the closing portion constituting element 10d, the horizontally long closing portion constituting element 10d ′, and the adjusting element 10e.
The closed structural rebar includes a closed loop rebar Tr composed of the element internal rebar 20 and the U-shaped main rebar 31, a closed loop rebar Tr composed of the element internal rebar 20 and the straight main rebar 34, and a long U rebar 35. Corresponding to the closed-loop rebar Tr
The fitting joint of the preceding element corresponds to the tip side fitting joint 11a,
The underground structure corresponds to the underground crossing structure 100,
The closed part corresponds to the closed part space H,
The closing part structure corresponds to the adjustment element 10e,
The preceding element rebar corresponds to the rebar 20 in the element,
The closing part reinforcing bars correspond to the U-shaped main reinforcing bar 31 and the straight main reinforcing bar 34,
The connection joint corresponds to the mechanical joint 40,
The connecting surface corresponds to the web plate 13,
The connecting direction part corresponds to the connecting direction part 20a, 31a,
The assembled reinforcing bars correspond to the two U-shaped main reinforcing bars 31 that are superposed,
The shear reinforcing bar corresponds to the shear reinforcing bar 32,
The temporary assembly state corresponds to the cage rebar 30a,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

  For example, in the above description, the construction of the underground transverse structure 100 having a horizontally long rectangular cross section with the standard element 10a, the reference element 10b, the corner element 10c, and the adjustment element 10e in the general part is described. Element 10b and standard element 10a are arranged horizontally in a single letter, or vertically arranged in one line, or standard element 10a, reference element 10b, and corner element 10c are arranged in a T-shape, gate-shaped or L-shaped, and underground crossing The structure 100 may be constructed. Furthermore, you may construct | assemble the underground crossing structure 100 of a circular cross section or an arc-shaped cross section using the trapezoidal cross section or the strip | belt-shaped arc-shaped standard element 10a, the reference | standard element 10b, and the adjustment element 10e.

In the case of a single gate-shaped underground crossing structure, the reference elements 10b are arranged on both sides, the closing part constituting element 10d is arranged in the middle part of the single letter shape, and the adjusting element 10e is disposed between the closing part constituting elements 10d. Will be constructed.
Although the U-shaped main reinforcing bar 31 or the straight main reinforcing bar 34 and the in-element reinforcing bar 20 are connected by the mechanical joint 40, they may be connected by a connecting jig for injecting and connecting grout material or resin.

DESCRIPTION OF SYMBOLS 10 ... Cover element 10a ... Standard element 10b ... Reference | standard element 10c ... Corner | angular part element 10d ... Closure part constituent element 10d '... Horizontally long close part constituent element 10e ... Adjustment element 11 ... Fitting joint 11a ... Tip side fitting joint 13 ... Web plate 13a ... Passing hole 20 ... Element internal reinforcement 20a ... Connection direction part 30 ... Closure part reinforcement 30a ... Basket reinforcement 31 ... U-shaped main reinforcement 31a ... Connection direction part 32 ... Shear reinforcement reinforcement 34 ... Straight main reinforcement 35 ... Long U-shaped reinforcing bar 39 ... Cover plate 40 ... Mechanical joint 50 ... Concrete 100 ... Underground crossing structure 300 ... Historical ground H ... Closed part space Rp ... Lap part Tr ... Closed loop reinforcing bar X ... Insertion direction Z1 ... Connection direction Z2 ... Crossing direction

Claims (4)

A long covering having a substantially C-shaped cross-section fitting along the longitudinal direction and a substantially rectangular cross-section covering the connecting crossing direction intersecting the connecting direction and a predetermined interval in the connecting direction. Insert the element into the ground along the longitudinal direction while fitting it to the fitting joint of the preceding element, which is the other lining element inserted earlier, and connect the concrete inside the lining element. In the underground structure to be constructed, a closing portion that connects a closing portion formed between the preceding elements arranged at intervals in the connecting direction and closes in a structural cross-sectional direction orthogonal to the longitudinal direction. Structure,
The preceding elements on both sides constituting the closing portion are arranged at intervals in the connecting direction as closing portion constituting elements,
A closed structural rebar disposed over both closed part constituting elements constituting the closed part so as to straddle the closed part,
The closed structural rebar,
It is composed of an element internal reinforcing bar that is arranged in the closing part constituting element, and a closed part reinforcing bar that is connected to the element internal reinforcing bar and arranged in the closing part,
The rebar in the element,
In the connecting surface facing the closing portion in the closing portion constituting element, a predetermined interval is formed in the connection crossing direction, and a substantially concave shape having two connecting direction portions along the connecting direction is formed.
The closure rebar,
It is composed of two connecting direction portions of the element internal reinforcing bars, or two along the connecting direction connecting to the connecting direction portion of the element internal reinforcing bars in each closing portion constituting element constituting the closing portion, and
Each open side end of the connecting direction portion of the inner reinforcing bar of the element is connected to each end of the closing part reinforcing bar by the connection joint, and the inner reinforcing bar of the element and the closing part reinforcing bar form a substantially closed loop shape. And
The closing part structure is configured by the closing part and the concrete placed inside the closing part constituting element, the closing part reinforcing bar, the element internal reinforcing bar, and the closing part constituting element . The closing part structure according to claim 1, wherein the connection surface includes a passage hole that allows passage of the connection joint. A covering crossing direction that intersects the connecting direction, and a long and substantially cross-sectional covering element that has a fitting joint having a substantially C-shaped cross section along the longitudinal direction at a predetermined interval in the connecting direction, The ground which is constructed by filling the concrete inside the lining element and inserting it into the natural ground along the longitudinal direction while fitting with the fitting joint of the preceding element which is the other lining element previously inserted. In an intermediate structure, a closing part construction method is performed in which a closing part configured between the preceding elements is connected and closed in a structure cross-sectional direction perpendicular to the longitudinal direction,
The preceding elements on both sides constituting the closing portion are arranged at intervals in the connecting direction as the closing portion constituting element,
An element internal rebar that arranges a closed structural reinforcing bar arranged in both closed part constituting elements constituting the closed part so as to straddle the closed part , and the element internal reinforcing bar. And connecting with the closing part reinforcing bar that arranges the bars in the closing part,
The rebar in the element,
In the connecting surface facing the closing portion in the closing portion constituting element, a predetermined interval is formed in the connection crossing direction, and a substantially concave shape having two connecting direction portions along the connecting direction is formed.
The closure rebar,
Each connecting direction part of the rebar in the element, or composed of two along the connecting direction to connect to the connecting direction part of the element rebar in each closing part constituting element constituting the closing part,
A closed part excavation step of excavating the closed part to form a closed part space while covering the both sides of the closed part in the connecting cross direction with a cover plate so as to straddle both closed part constituting elements;
In the closing part space, a closing part distributing bar process for arranging a closing part reinforcing bar connectable to an in-element reinforcing bar arranged in the closing part constituting element;
In the connecting surface facing the closing part of the closing part constituting element, a closing part constituting element reinforcing step for arranging the rebar in the element formed in a substantially concave shape so that the parallel part is along the connecting direction;
Each open side end of the connecting direction portion of the element internal reinforcing bar is connected to each end of the closing part reinforcing bar by a connection joint, and the element internal reinforcing bar and the two closing part reinforcing bars in each closing part constituting element And a connecting step for forming the closed-loop reinforcing bar,
There rows and concreting step of setting concrete in the closure portion configured elements inside and the closing portion space,
The closed part construction method , wherein the closed part is constituted by concrete placed in the closed part, the closed part reinforcing bar, the element internal reinforcing bar, and the closed part constituting element . The connecting surface is provided with a passage hole that allows passage of the connection joint,
Both closing part constituting elements constituting the closing part are arranged in a straight line along the connecting direction,
The closing portion constituting element arranging step,
The element in rebar while the closure part configuration element of the two closure part configuration element, a first connecting step of connecting the closing portion reinforcing bar through the connection fitting,
A second connecting step of performing the second connection step of connecting the connecting joint, to which the closing part reinforcing bar is connected, passing through the passage hole to the one side and then connecting to the element internal reinforcing bar of the other closing part constituting element. Item 5. A closed part construction method according to Item 3.

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