JP7297206B2 - Connection Structure and Connection Method of Tunnel Shoring - Google Patents

Description

TECHNICAL FIELD The present invention belongs to the technical field of connection structures and connection methods for tunnel shoring.

Conventionally, the NATM construction method is known as a method for constructing mountain tunnels. The NATM construction method uses shotcrete, rock bolts, steel tunnel support, and the like.

The tunnel support is generally formed in an arch shape by butting and connecting a plurality of support members formed in an arc shape or the like in the axial direction. Adjacent support members are joined by a bolt joining operation in which the joint plates provided at the end of the connection side are brought into contact with each other, and bolts are passed through the through holes formed on the face side and the wellhead side of the joint plates and tightened with nuts. go and connect.
In recent years, an invention has also been disclosed that makes it possible to omit the bolt joining work on the face side of the joint plate (see, for example, Patent Document 1).
By the way, the work of connecting the adjacent support members is usually performed manually by a worker who supports the support members with heavy machinery such as an erector or a drill jumbo and is placed in a man cage mounted on the heavy machinery. An invention has also been disclosed in which manual work is avoided and automatic work is performed using heavy machinery (see, for example, Patent Document 2).

The invention according to Patent Document 1 is, as shown in FIGS. Joint plates 43 and 44 are provided at the ends of the member 41, and the support members 41 are connected to each other with the joint plates 43 and 44 facing each other. 43 is formed with a projection 46, and a joint plate 44 of the other support member 41 is formed with a hole 47 into which the projection 46 is inserted. (see claim 1, etc.).

According to the tunnel support described in Patent Document 1, the position of the support member 41 (42) can be adjusted simply by inserting the protrusion 46 formed on the surface of one joint plate 43 into the hole 47 of the other joint plate 44. Alignment is completed. Therefore, it is recognized that there is an effect that it is possible to easily assemble the support members 41 (42) using heavy machinery (see paragraph [0021]).
In addition, it is also recognized that when the projection 46 and the hole 47 are provided on the face side of the joint plates 43 and 44, there is an effect that the work on the face side can be reduced (paragraph [0023] reference).

JP 2018-131865 A Japanese Patent No. 6374050

However, according to the tunnel shoring described in Patent Document 1, since it is a configuration in which shear must be borne by the engagement between the projection 46 and the hole 47 (see paragraph [0023]), FIG. ), the protrusion 46 must be inserted into the hole 47 without sliding.
Therefore, it is presumed that the work of aligning the joint plates 43 and 44 before inserting the projection 46 into the hole 47 will be difficult and time-consuming.
In addition, when the protrusions 46 and holes 47 are provided on the face side of the joint plates 43 and 44, the alignment work is forced to be performed in a state where the field of view is almost blocked by the support members 41 (42). It is presumed to be time consuming.

Further, according to the invention described in Patent Document 2, although it is possible to avoid the manual work of workers and realize automatic work by heavy machinery, It is presumed that a series of operations for aligning and finely adjusting the positions of the end joint plates 122) and connecting (combining) the two are time-consuming.
In addition, the connection state between the joint plates cannot be confirmed (visually recognized), and reliability is lacking. In addition, the joint plates have a special structure, and there is a concern that the cost will increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable the joint plates to be aligned efficiently and reliably with a simple structure, and to securely align the adjacent support members without bolting the face sides of the joint plates to each other. To provide a connection structure and a connection construction method for a tunnel shoring which can be connected to a tunnel and is excellent in economy, workability, reliability and safety.
Another object of the present invention is to provide a tunnel in which work efficiency is dramatically improved, such as by making it possible to connect bolts between the joint plates on the portal side by devising the nut structure so that the fastening work can be achieved with almost one-touch operation. The object is to provide a connection structure and connection method for shoring.

As a means for solving the above problems, the connection structure for tunnel shoring according to the invention described in claim 1 is a tunnel shoring structure in which a plurality of support members are butt-connected in the axial direction to form an arch. In connection structure,
The adjacent support members are H-section steels having vertical webs, and the back surfaces of the joint plates are joined to the ends of the H-section steels on the butt connection side, and the front surfaces of the joint plates are in contact with each other. be configured to be butt-connected in a
One of the joint plates includes a positioning pin projecting in a direction perpendicular to the back surface on the face side with the web as a boundary , and a through hole formed on the wellhead side,
The other joint plate includes a guide member formed so as to wrap around the back face side of the one joint plate and having a recess for receiving the positioning pin from the face side; a through hole formed so that the core is aligned with the through hole formed on the wellhead side when received and positioned,
Adjacent support members are butt-connected by inserting bolts through through-holes formed on the side of the wellhead where the cores are aligned and tightening them with nuts.

The invention described in claim 2 is the tunnel support connection structure described in claim 1 , wherein the joint plate is located on the tunnel side rather than the face side with the H-shaped steel web used as the support member as the boundary line. It is characterized in that it is joined to the supporting member while being deviated so that the area is increased.

The invention described in claim 3 is characterized in that, in the connection structure for tunnel shoring described in claim 1 or 2 , a plurality of through holes are provided in the joint plate.

The invention described in claim 4 is the connection structure of the tunnel shoring described in any one of claims 1 to 3 , wherein:
The nut has a structure in which a threaded cylindrical body having a through hole aligned with the through hole of the nut body and having a threaded portion formed on the inner wall is accommodated inside the cylindrical nut body,
The storage chamber in the nut body for storing the cylindrical screw body has a tapered portion on the outer peripheral surface thereof that expands in diameter from the bolt insertion port side of the nut body toward the bolt through port side,
The threaded cylindrical body has a tapered portion on its outer peripheral surface that is slidable in the axial direction of the nut body, and is constantly biased from the bolt through hole side to the bolt insertion side by a biasing member provided in the storage chamber. It is characterized by being

According to a fifth aspect of the present invention, there is provided a tunnel support connection method in which a plurality of support members are butt-connected in the axial direction to form an arch shape,
The adjacent support members are H-shaped steel with a vertical web, and the back of the joint plate is joined to the end of the H-shaped steel on the butt connection side, and the front faces of the joint plates are brought into contact with each other. For butt connection,
One of the joint plates includes a positioning pin projecting in a direction perpendicular to the back surface on the face side with the web as a boundary , and a through hole formed on the wellhead side,
The other joint plate includes a guide member formed so as to wrap around the back face side of the one joint plate and having a recess for receiving the positioning pin from the face side ; Having a through hole formed so that the core is aligned with the through hole formed on the wellhead side when received and positioned,
The guide member of the other joint plate is positioned on the positioning pin of the one joint plate, and the faces of both joint plates are fastened with nuts by inserting bolts through the through holes formed on the wellhead side with the cores aligned. Adjacent support members are butt- connected without bolting the sides.

According to the connection structure and connection method for tunnel shoring according to the present invention, the following effects are obtained.
(1) A connection structure for tunnel shoring that is excellent in economic efficiency, workability, and reliability because the work of aligning the joint plates of the supporting members facing each other can be performed efficiently and reliably with a simple configuration. A connection construction method can be realized.
(2) Since the adjacent support members can be connected without bolting the face sides of the joint plates to each other, the connection work can be performed without inserting fingers into the face side where the work space tends to be narrow. be able to. Therefore, it is possible to realize a tunnel shoring connection structure and connection method that are also excellent in safety.
(3) When the nut described in the second embodiment is used, the joint plates can be bolted together by a one-touch operation. You can do it exponentially faster. Therefore, it is possible to realize a connection structure and connection method for tunnel shorings that are extremely superior in work efficiency, such as greatly shortening the work time and thus the construction period. Incidentally, according to experiments conducted by the present applicant, it has been found that the work time can be shortened to about 1/10 of the screwing work using a conventional nut.

1 is an elevational view showing an embodiment of a connection structure for tunnel shoring according to the present invention; FIG. (a) is an enlarged elevational view showing the connection structure at the top of the tunnel shoring in FIG. ) is a cross-sectional view taken along the line BB in (a). (a) is a plan view of FIG. 2 (a), and (b) is a C arrow view of (a). (a) is an elevational view showing the right support member of FIG. 2 (a), (b) is a plan view of (a), and (c) is a left side of (a) FIG. 4D is a side view of the joint plate, and FIG. 4D is a cross-sectional view taken along the line DD of FIG. (a) is an elevational view showing the left support member of FIG. 2(a), (b) is a plan view of (a), and (c) is an E- It is an E arrow directional cross-sectional view, and (d) is a figure which shows the joint board which looked at (a) from the right side. 1(a) to 1(c) are plan views showing step by step an embodiment of a method for connecting tunnel shoring according to the present invention. (a) is a partial cross-sectional view of a half surface of a nut used in Example 2, and (b) is a left side view of (a). (a) to (b) are explanatory diagrams showing step by step a method of connecting tunnel shoring using nuts used in Example 2. FIG.

Next, an embodiment of a tunnel support connection structure and connection method according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the connection structure of tunnel shoring according to the present invention is a tunnel shoring in which a plurality of (two in the illustrated example) support members 1 and 2 are butt-connected in the axial direction to form an arch. It is the connection structure of the engineering 10.
As shown in FIGS. 2 and 3, the adjacent support members 1 and 2 are H-section steels having vertical webs. , 21 are joined , and the front surfaces of the joint plates 11 and 21 are butt-connected while they are in contact with each other.
One of the joint plates 11, as shown in FIG. 4 and the like, has a positioning pin 12 projecting perpendicularly to the back surface on the face side with the web as a boundary , and a through hole 13 formed on the pit side. , 13.
As shown in FIGS. 5 and 6, the other joint plate 21 is formed so as to extend around the back surface of the one joint plate 11 on the face side , and is a concave portion for receiving the positioning pin 12 from the face side. and through holes 23, 23 formed so that their cores are aligned with the through holes 13, 13 formed on the wellhead side when the positioning pin 12 is received in the recess and positioned. It has
Then, the joint plates 11 and 12 and the adjacent support members 1 and 2 are brought into contact with each other by passing the bolts 3 through the through holes 13 and 23 formed on the side of the wellhead where the cores are aligned and tightening them with the nuts 4. Connected.
A specific description will be given below.

The tunnel support 10 is also called a steel support, and is suitably used for constructing a tunnel while stabilizing the excavated ground around the tunnel by the NATM construction method. Usually, they are formed in an arch shape as shown in Fig. 1, and although not shown, they are installed at predetermined intervals in the extension direction of the tunnel, and are used for the subsequent concrete spraying and rock bolting operations. be.
The tunnel support 10 according to the present embodiment has a structure in which a pair of support members 1 and 2, which are formed in an arc by bending an H-shaped steel with a required curvature, are butt-connected at one point at the top (tunnel crown). It has been implemented. The butt connection work is sometimes called high place work, and is manually performed by a worker placed in a man cage mounted on the heavy machine while supporting the support member by heavy machine such as an erector or a drill jumbo.
Although the tunnel support 10 according to the present embodiment is configured to be formed in an arch shape with two members (support members 1 and 2), it is not limited to this. Some tunnel shorings are constructed with three or more (eg, four) members forming an arch. In this case, the connection structure according to the present invention is applied to the connecting portion of the top portion (tunnel crest portion), and the connecting structure according to the present invention is applied to the other connecting portions as appropriate to construct the tunnel shoring.
The size and installation pitch of the tunnel shoring 10 can be appropriately changed according to the structural design taking into consideration the properties of the natural ground. Along with this, the sizes of the supporting members 1 and 2 can also be appropriately changed in design. Further, the support members 1 and 2 are made of H-shaped steel.

The support members 1 and 2 constituting the tunnel support 10 are integrally provided with joint plates 11 and 21 at the end portions on the connecting side by joining means such as welding.
The joint plates 11 and 21 according to this embodiment are implemented by rectangular flat steel plates of the same shape and size. Incidentally, the size of the joint plates 11 and 21 according to this embodiment is, for example, 155 mm in length, 180 mm in width, and 9 mm in plate thickness.
As shown in FIGS. 2B and 2C, the joint plates 11 and 21 of the illustrated examples are arranged on the face side with the vertical plane including the axis (web) of the support members 1 and 2 as the boundary line. It is welded to the support members 1 and 2 so that the area on the side of the wellhead is larger than that of the support members 1 and 2 . This is to ensure a sufficient space on the side of the wellhead where the bolts 3 are to be fastened.

As shown in FIG. 4 and the like, the joint plate 11 on one side (the right side in the illustrated example) has a positioning pin 12 welded to the back surface on the face side of the axis (web) of the H-shaped steel forming the support member 1 . , and two through holes 13, 13 are formed on the wellhead side.
As an example, the positioning pin 12 according to the present embodiment is made of a round steel having a diameter (φ) of 21 mm and a height (protrusion dimension) of 25 mm. It is set up and implemented.
As an example, the two through-holes 13, 13 are both drilled with a hole diameter (φ) of 25 mm, and are arranged obliquely with a well-balanced spacing of 50 mm vertically and 35 mm horizontally on the wellhead side of the joint plate 11. is being carried out in

The joint plate 21 on the other side (the left side in the illustrated example) is, as shown in FIG. A guide member 22 formed to be able to position the positioning pin 12 is provided by joining means such as welding so as to wrap around to the back side of the hole, and when the positioning pin 12 is positioned on the guide member 22 on the wellhead side Through-holes 23, 23 having the same core as the through-holes 13, 13 are formed.
As shown in FIG. 5(b), the guide member 22 according to the present embodiment is a steel material that is bent into a hook shape (hook shape) in plan view comprising a hook portion 22a, a protruding portion 22b, and a wraparound portion 22c. , and is attached by welding the latching portion 22a to the back portion of the joint plate 21 near the vertical side on the face side. The protruding dimension (inner dimension) of the protruding portion 22b is 22 mm, which can accommodate two joint plates 21 and 22 having a plate thickness of 9 mm. Further, as shown in FIG. 5(d), the winding portion 22c is formed in a tapered shape that widens from the right to the left, and the central portion (base end portion) of the winding portion 22c is positioned so as to support the positioning pin 12. It is formed in a semicircular concave groove (hole diameter (φ) of 21 mm) that can be positioned (accepted).
As an example, the two through holes 23, 23 are both drilled with a hole diameter (φ) of 25 mm, and are aligned with the through holes 13, 13 in a well-balanced manner on the portal side of the joint plate 21, It is arranged obliquely with an interval of 50 mm vertically and 35 mm horizontally.

Thus, by positioning the joint plates 11 and 21, the positioning pin 12 on the joint plate 11 side is positioned in the semicircular concave groove of the guide member 22 (wrapping portion 22c) on the joint plate 21 side. Then, the cores of the through holes 13, 23 provided on the portal sides of the joint plates 11, 21 automatically match and communicate with each other (see FIG. 6(b)).
Then, by inserting bolts 3 through the through holes 13, 23 with the same core and tightening them with nuts 4, the adjacent joint plates 11, 21 and thus the support members 1, 2 are connected to each other.
In this embodiment, two through-holes 13 and 23 are provided on the wellhead side, but the present invention is not limited to this. The design can be changed as appropriate. Accordingly, the size and shape of the joint plates 11 and 21 can be changed as appropriate.

Next, a tunnel shoring connection method for realizing the connection structure of the tunnel shoring 10 having the above configuration will be described.
In this tunnel support connection method, the adjacent support members 1 and 2 are made of H-shaped steel with a vertical web, and the backs of joint plates 11 and 21 are attached to the ends of the H-shaped steel on the butt connection side. and butt connection by bringing the front surfaces of the joint plates 11 and 21 into contact with each other. The joint plate 21 has the guide member 22 and the through holes 23, 23. The positioning pin 12 of the one joint plate 11 is positioned to the guide member 22 of the other joint plate 21, and the core is positioned. By inserting bolts (bolts with heads) 3 through aligned through holes 13, 23 and fastening with nuts 4, the face sides of both joint plates 11, 21 are not joined by bolts, and the adjacent support members 1, 2 are connected. Butt and connect each other.

Specifically, the joint plates 11 and 21 having the above-described structure are supported on the left and right sides by operating a heavy machine such as an erector or a drill jumbo (not shown), as shown in stages in FIGS. While supporting the members 21 and 11, the joint plate 11 is slid in the depth direction (horizontal direction) on the face side and inserted into the guide member 22 of the joint plate 21. is fitted into the semicircular concave groove formed in the guide member 22 for positioning. Then, the two through-holes 13, 13 of the joint plate 11 exhibit a structure in which the corresponding two through-holes 23, 23 of the joint plate 21 are aligned and communicated (see FIG. 6(b)). .
During the positioning operation while sliding the joint plate 11, the positioning pin 12 is guided (guided) into the concave groove smoothly and reliably by the taper effect formed in the guide member 22 (wrapping portion 22c). Therefore, it is possible to perform a quick and stress-free positioning operation even if the heavy equipment is used.
After that, a worker placed in a man cage mounted on a heavy machine manually inserts bolts (bolts with heads) 3 through the through holes 13 and 23 with the same core and fastens them with nuts 4 to connect adjacent joints. The plates 11 and 21 and thus the support members 1 and 2 are connected to each other.

Therefore, according to the connection structure and connection construction method of the tunnel support 10 according to the first embodiment described above, the work of aligning the joint plates 11 and 21 can be performed efficiently and reliably with a simple configuration, which is economical. It is possible to realize a connection structure and a connection construction method for the tunnel support 10 that are excellent in performance, workability, and reliability.
In addition, since the adjacent support members 1 and 2 can be connected without bolting the face sides of the joint plates 11 and 21, there is no need to put fingers into the face side where the working space tends to be narrow. Connection work can be done. Therefore, it is possible to realize a connection structure and connection construction method for the tunnel support 10 that is also excellent in safety.

7 and 8 show the connection structure and connection method of the tunnel support according to the second embodiment. The connecting structure and connecting method of the tunnel shoring according to the second embodiment differ from those of the first embodiment in that the structure of the nut 4 is different. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

As shown in FIG. 7, the nut 4 according to the second embodiment has a cylindrical nut body 41 and a through hole 42a which is aligned with the through hole 41a of the nut body 41. It is a structure in which a threaded cylindrical body 42 having a portion 42b is accommodated.
The storage chamber 43 in the nut body 41 for storing the screw cylinder 42 has a tapered outer peripheral surface 43a that expands in diameter from the bolt insertion side (IN) of the nut body 41 toward the bolt penetration side (OUT). has a department.
The threaded cylinder 42 has a tapered portion on its outer peripheral surface 42c that is slidable in the axial direction of the nut body 41, and the bolt through hole side ( OUT) is always biased toward the bolt insertion port side (IN).

Specifically, the nut body 41 has a hexagonal outer shape, and a storage chamber 43 is formed therein. The outer shape can be hexagonal, circular, polygonal, or any other shape.
The storage chamber 43 is formed in a tapered shape that gradually decreases in diameter toward the bolt insertion port side (IN) from the substantially intermediate portion in the axial direction. A stop member 45 having a through hole 45a formed in the center thereof is fixed by caulking or the like. The stop member 45 is a plate-shaped member and is formed in a flange shape.

A plurality of sliding guide ridges (not shown) are formed on the outer peripheral surface 43a of the storage chamber 43 at appropriate intervals in the circumferential direction. The threaded cylindrical body 42 is arranged slidably in the axial direction of the nut body 41 between the sliding guide projections. As shown in FIG. 7(b), three screw cylinders 42 according to the present embodiment are implemented, but the number is not particularly limited, and the number can be increased or decreased as appropriate according to the structural design.
A threaded portion (female thread) 42b formed on the inner wall portion of the threaded cylindrical body 42 is composed of a helical locking ridge and locking groove, and is formed in an arc around the axis of the nut body 41 and in the axial direction. engraved along the The helical screw portion 42b may be formed in a helical shape, and any screw thread may be used as the cross-sectional shape thereof. The interval between the locking ridges can also be set arbitrarily.

With the above configuration, when the three screw cylinders 42 retreat along the outer peripheral surface 43a of the storage chamber 43 toward the bolt through hole (OUT), the central portion formed by the three screw cylinders 42 The diameter of the threaded portion 42b (through hole 42a) is increased, and conversely, when the threaded portion 42b advances toward the bolt insertion port side (IN), the diameter of the threaded portion 42b is reduced.

The sliding guide ridge can be formed arbitrarily. For example, it is formed in a spiral shape, and the more the threaded cylindrical body 42 is retracted, the more the threaded portion 42b and the bolt (headed bolt) 3 are formed. You may make it loosen the fastening with the male screw 31 mentioned later. Further, although the sliding guide ridges may not be provided, if the slidable guide ridges are provided, the bolt 3 can be easily rotated with respect to the nut in the state where the bolt 3 and the nut 4 are connected, and retightening can be easily performed. and release of the connected state can be easily performed.

A moving member 46 is provided in the housing chamber 43 so as to be movable in the axial direction of the nut body 41 . The moving member 46 is commonly engaged with the screw cylinder 42, and has a collar portion 46a having a through hole formed in the center thereof, and moving from the inner peripheral end of the collar portion 46a toward the bolt through hole side (OUT). It is composed of a fixed cylindrical guide portion 46b. As shown in FIG. 7A, the end portion of the guide portion 46b closer to the bolt through-hole side (OUT) is closer to the bolt insertion hole side than the stop member 45 when the bolt 3 and the nut 4 are not connected. (IN).
The inner diameter of the guide portion 46b is set larger than the outer diameter of the male screw 31 of the bolt 3. As shown in FIG. Further, the outer diameter of the guide portion 46b is set larger than the inner diameter of the through hole of the stop member 45. As shown in FIG.
In the present embodiment, the guide portion 46b is formed in a cylindrical shape having substantially the same inner diameter throughout the axial direction of the nut body 41, but the diameter is reduced or expanded toward the bolt insertion port side (IN). It may be formed to have a diameter. When the guide portion 46b is formed in this manner, the outermost diameter thereof is set larger than the inner diameter of the through hole of the stop member 45. As shown in FIG.

The biasing member 44 is interposed between the collar portion 46 a and the stop member 45 in the storage chamber 43 . The biasing member 44 is preferably an elastic member such as a coil spring, rubber, resin, or urethane. In this embodiment, as shown in FIG. 7(a), a conically formed coil spring 44 is used to store in a compressed state. The screw cylinder 42 and the moving member 46 are always urged toward the bolt insertion port side (IN) by the urging force of the urging member 44 .

On the other hand, as shown in FIG. 8, the bolt 3 is formed in a rod shape, and has a male screw 31 formed on its outer peripheral surface with a helical locking ridge and a locking groove centering on the axis of the nut. It is carved along the axial direction of the main body 4 . The helically formed external thread 31 can have a thread of any shape provided that it can be engaged with the threaded portion 42 b of the threaded cylinder 42 .

Next, a bolt joining operation using the nut 4 configured as described above will be described.
As shown in FIG. 6(b), the joint plates 11 and 21 are aligned, and the through holes 13 and 23 provided on the portal sides of the joint plates 11 and 21 are aligned to communicate with each other. The same work steps as in the first embodiment are carried out up to the stage of presenting a structure that does.
After that, as shown in FIG. 8(a), the male screw 31 of the bolt (headed bolt) 3 is inserted into the through holes 13 and 23 with the cores aligned, and the tip of the male screw 31 is It is inserted into the storage chamber 43 of the nut body 41 without rotating each other.
The effect of inserting the bolt 3 pushes the screw cylinder 42 toward the bolt through hole (OUT), and the screw cylinder 42 and the moving member 46 retreat against the biasing force of the biasing member 44 . The bolt 3 expands the threaded portion 42b (through hole 42a) formed by the threaded cylindrical body 42, and is inserted into the through hole 42a while overcoming the locking ridge of the threaded portion 42b of each threaded cylindrical body 42. . The tip of the bolt 3 protrudes outside the nut body 41 as shown in FIG. 8(b).

After that, the three screw cylinders 42 and the moving member 46 are pushed back toward the bolt insertion port side (IN) by the biasing force of the biasing member 46, and the diameter of the screw portion 42b (female thread) is gradually reduced. , the threaded portion 42b of each threaded cylindrical body 42 meshes with the male thread 31 of the bolt 3, and as a result, the bolt 3 and the nut 4 are connected to connect the joint plates 11 and 21, and thus the support members 1 and 2. . Also, retighten if necessary.

In this manner, the bolt 3 and the nut 4 can be connected by a one-touch operation by inserting the tip of the bolt 3 into the threaded cylindrical body 42 of the nut 4 without rotating each other. Alignment of the bolt 3 and the nut 4 at the time of mutual insertion is easy, and can be performed easily and quickly as compared with the bolt joining operation using a normal nut (for example, the nut 4 of Example 1). can.
Further, by slidably providing the threaded cylindrical body 42 between the sliding guide ridges, the bolt 3 and the nut 4 can be secured even after the joint plates 11 and 21 (supporting members 1 and 2) are connected to each other. By rotating either one of them, the connection state between the bolt 3 and the nut 4 can be released without the screw cylinder 42 co-rotating.

Therefore, according to the connection structure and connection construction method of the tunnel support 10 according to the second embodiment described above, the bolt joining operation between the joint plates can be realized by almost one-touch operation, so that the effects of the first embodiment (the above-mentioned In addition to paragraph [0028] reference), the bolt connection work can be performed remarkably quickly.
Therefore, it is possible to realize a connection structure and connection method for tunnel shorings that are extremely superior in work efficiency, such as greatly shortening the work time and thus the construction period.

Although the embodiments have been described above with reference to the drawings, the present invention is not limited to the illustrated examples, etc., and the range of design changes and application variations that are normally made by those skilled in the art without departing from the technical idea of the present invention. Just to be sure to include.

Reference Signs List 1 support member 11 joint plate 12 positioning pin 13 through hole 2 support member 21 joint plate 22 guide member 22a latching portion 22b projecting portion 22c wrapping portion 23 through hole 3 bolt 31 male screw 4 nut 41 nut body 41a through hole 42 screw cylinder Body 42a Through hole 42b Threaded portion 42c Peripheral surface 43 Storage chamber 43a Peripheral surface 44 Biasing member (coil spring)
45 stop member 45a through hole 46 moving member 46a flange 46b guide 10 tunnel support

Claims (5)

In a connection structure of a tunnel shoring in which a plurality of support members are butt-connected in the axial direction to form an arch shape,
The adjacent support members are H-section steels having vertical webs, and the back surfaces of the joint plates are joined to the ends of the H-section steels on the butt connection side, and the front surfaces of the joint plates are in contact with each other. be configured to be butt-connected in a
One of the joint plates includes a positioning pin projecting in a direction perpendicular to the back surface on the face side with the web as a boundary , and a through hole formed on the wellhead side,
The other joint plate includes a guide member formed so as to wrap around the back face side of the one joint plate and having a recess for receiving the positioning pin from the face side; a through hole formed so that the core is aligned with the through hole formed on the wellhead side when received and positioned,
A connecting structure for tunnel shoring, characterized in that the adjacent supporting members are butt- connected by passing bolts through through-holes formed on the portal side where the cores are aligned and fastening with nuts. The joint plate is joined to the support member by deviating from the H-shaped steel web used as the support member as a boundary line so that the area on the pit side is larger than that on the face side, The connection structure for tunnel shoring according to claim 1 . 3. The connecting structure of tunnel shoring according to claim 1 , wherein a plurality of through holes are provided in said joint plate. The nut has a structure in which a threaded cylindrical body having a through hole aligned with the through hole of the nut body and having a threaded portion formed on the inner wall is accommodated inside the cylindrical nut body,
The storage chamber in the nut body for storing the cylindrical screw body has a tapered portion on the outer peripheral surface thereof that expands in diameter from the bolt insertion port side of the nut body toward the bolt through port side,
The threaded cylindrical body has a tapered portion on its outer peripheral surface that is slidable in the axial direction of the nut body, and is constantly biased from the bolt through hole side to the bolt insertion side by a biasing member provided in the storage chamber. The connecting structure of the tunnel shoring according to any one of claims 1 to 3 , characterized in that In a method for connecting a tunnel support structure in which a plurality of support members are butted and connected in the axial direction to form an arch shape,
The adjacent support members are H-shaped steel with a vertical web, and the back of the joint plate is joined to the end of the H-shaped steel on the butt connection side, and the front faces of the joint plates are brought into contact with each other. For butt connection,
One of the joint plates includes a positioning pin projecting in a direction perpendicular to the back surface on the face side with the web as a boundary , and a through hole formed on the wellhead side,
The other joint plate includes a guide member formed so as to wrap around the back face side of the one joint plate and having a recess for receiving the positioning pin from the face side ; Having a through hole formed so that the core is aligned with the through hole formed on the wellhead side when received and positioned,
The guide member of the other joint plate is positioned on the positioning pin of the one joint plate, and the faces of both joint plates are fastened with nuts by inserting bolts through the through holes formed on the wellhead side with the cores aligned. A method for connecting tunnel shoring, characterized in that the adjacent shoring members are butt- connected without bolting their sides.

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