JPH02217598A - Connecting structure of segment - Google Patents

Abstract

PURPOSE:To reduce time period required for connection by a method in which a coupler is provided for the axial projection of tunnel, a casing is buried in a segment, a recession to be joined with projections is formed, and an elastic part is set between the casing and the peripheral sleeve. CONSTITUTION:A bar-like coupler 22 is projected from one end of a segment 10, projections 26 are formed on the periphery of the projected part 25, and a serrated cross section including the axial line is formed in the bar-like part to permit it to couple with the other segment coupler exactly. Projections are formed even on the periphery of the buried portion 28 of the coupler 22 of the segment 10, and a flange 30 is formed on the end portion. An elastic part 40 is set between a casing 36 buried in the segment 10 with the coupler 24 and the sleeve 38, and the projected part 25 is inserted into the sleeve 38. The projections 26 are coupled with the inner recessions 44 of the sleeve 38. Hermetical adhesion can thus be obtained exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a connecting structure of segments that are connected to each other to form and maintain a predetermined tunnel space.

(Prior art) The shield construction method is often used when constructing waterworks, sewers, public ditches, underground passages, tunnels, etc. This construction method uses a strong cylindrical outer shell made of steel called a shield. Extrusion is carried out using the shield jack installed inside the shield, and various works such as excavation, lining, backfilling, etc. can be performed under the protection of the extruded shield, so it is safe and reliable, and there is no impact on the surrounding area. It has many advantages such as less

Usually, part of the lining work involves one or more segments 1-10 shown in Figure 9(a) forming part of a cylinder.
are sequentially connected in the axial direction of the tunnel to form a tunnel space.

Conventionally, the connection between such segments is as shown in FIG. 9(b).
As shown in FIG.
4 and tightening the nut 16. Note that reference numeral 18 indicates mutually opposing segments I.
The symbol 20 in FIG. 9(a) indicates a sealing member attached to each recess formed on each end face of the O, and the reference numeral 20 in FIG. Another insertion hole through which a fastening bolt connecting the segments 1o to each other is inserted is shown.

(Problem to be Solved by the Invention 8) However, in the prior art, the number of insertion holes 12 through which bolts are inserted for connecting adjacent segments is at least four per segment, although the number varies depending on the specifications of the segments. Since it is customary to provide some
The number of fastening bolts will also increase corresponding to the number of segments to be connected.

For this reason, in the conventional connection structure, the time required to connect adjacent segments increases compared to the time required for tunnel construction, which is one reason for reducing work efficiency.

In addition, since the bolts and nuts that have been fastened may become loose during subsequent tunnel construction, retightening work is required, and maintenance and inspection work must be performed individually, which is troublesome.

Moreover, in the conventional structure in which adjacent segments are rigidly connected to each other by bolts, movement in the axial direction of the tunnel and/or in the direction crossing this due to earthquakes or ground movement cannot be followed or avoided. If not allowed, the forces resulting from these movements will act directly on the fastening bolt and the segments around it, elongating the bolt or causing the segment to fail. As a result, a gap is created between the end faces of adjacent segments, and the sealing member provided on the end face cannot perform its function sufficiently, allowing water or dirt to enter the tunnel. Otherwise, a problem arises in that the carrier fluid inside the tunnel leaks to the outside.

The present invention was made in view of these problems, and allows segments to be easily connected without the need for fastening bolts and nuts, and can sufficiently follow earthquakes and/or ground movements. The purpose is to provide a new connection structure that can

(Means for achieving the object) In order to achieve this object, the device of the present invention has the following features:
An engaging member is provided on each end face of the segment and has a protrusion formed on the outer periphery of a protrusion that protrudes in the tunnel axis direction, and a locking member that engages the protrusion of another adjacent segment when connecting the segments. a casing embedded in the segment; and an engagement recess disposed within the casing that is capable of engaging with the protrusion of the protrusion, and the engagement recess is formed on the inner surface of the protrusion. The device includes a sleeve having a peripheral wall formed with a slit extending in the insertion direction, and an elastic member disposed between the casing and the sleeve.

(Function) Therefore, in each segment having such a connection structure, the engagement member provided on the end face of one segment is arranged so as to face the locking portion provided on the other adjacent segment ring. Then, when the reaction force is applied to the segment through a suitable suppression device, such as a shield jack that presses the shield forward in the excavation direction, the protrusion of the adjacent segment will be inserted into the locking part of the segment. It will be done. At this time, the protrusion of the protrusion is inserted into the engagement recess provided on the inner surface of the sleeve by pushing and expanding the sleeve of the locking part of the segment against the elastic member disposed on the outer periphery of the sleeve. It is locked. Therefore, mutually adjacent segments can be physically connected reliably.

Moreover, since the sleeve of the locking portion is elastically supported by an elastic member disposed on its outer periphery, the locking portion and the locking member located opposite each other are in a relatively displaced state. Even if there are two segments, adjacent segments can be easily connected to each other by elastic deformation of the elastic member, and there is no need to fine-tune the opposing rings, further improving work efficiency. Even in a state where the ground is subsided, it can sufficiently cope with uneven subsidence of the ground, etc.

(Example) Hereinafter, the connection structure of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention,
Segments 10.1 before connection placed adjacent to each other
0, an engaging member 22 is provided on one end surface of each segment IO spaced apart in the tunnel longitudinal direction, and a locking portion 24 is provided on the end surface spaced apart from the engaging member 22, respectively.

As shown in FIG. 2(a), the engaging member 22 is made of a rod-shaped member and is provided to protrude from one end surface of the segment 10.

A protrusion 26 is formed on the outer periphery of the protruding portion 25, and in this embodiment, the protrusion 26 has a so-called sawtooth cross-sectional shape including the axis of the rod-shaped member, and each The ridges of the teeth face in the opposite direction to the protrusion direction so that they can surely engage with the locking parts 24 provided on other segments.

Embedded portion 28 of the engaging member 22 embedded in the segment) 10
Similarly to the protrusion 25, a protrusion is formed on the outer circumferential portion of the protrusion 25, and a flange portion 30 extending in the radial direction is further formed at the end thereof. Therefore, even if a force is applied to the engaging member 22 to pull it out, the engaging member 22
Since the protrusion and flange portion 30 formed on the buried portion 28 of No. 2 are firmly engaged with the segment O, the engagement member 2z will not fall off from the segment O.

Another engaging member 22 shown in FIG. 2(b) has a protrusion 2
5 has a protrusion 26 with a sawtooth cross-sectional shape, which is similar to the embodiment shown in FIG.
A male threaded portion is formed on the outer periphery of the segment 10, and by screwing the male threaded portion into a fixing sleeve 34 which is embedded in the segment 10 in advance and has a female threaded portion 32, the segment 1
The difference is that the engagement member 22 is fixed to the 0.

In this way, the engaging member 22 is configured to be screwed onto the fixing sleeve 34 embedded in the segment in advance as necessary, so that when manufacturing the segment, the engaging member 22, particularly its protrusion 26, can be attached to the segment. Since it does not protrude from the end face of the segment, it has the advantage of being easier to handle and transport during segment manufacture.

Note that the engagement member 22 is attached to and detached from the fixed sleeve by intersecting the axis of the engagement protrusion 22 with the protrusion 25 and its embedded portion 28.
By inserting the tip of a suitable rod-shaped member or screwdriver etc. into the insertion hole 36 provided in the middle part between the two and rotating it,
It can be done easily. Of course, if necessary, a part of the outer shape of the engaging member 22 may be made into a hexagonal shape, and the engaging member 22 may be rotated with a wrench or the like.

By the way, a locking portion 24 (
1), as shown in FIG. 3, for example, a casing 36 embedded in the segment 10, a sleeve 38 disposed within this casing, and a The elastic member 40 is provided.

The casing 36 is made of metal or engineered plastic and has a cylindrical shape, with a flange portion 42 projecting radially outward at one end and an open end at the other end, and the 7 flange portions 42 projecting into the segment 10. shall be buried. Therefore, the casing 36 is connected to the segment lO
Even if an external force acts in a direction that causes the casing 36 to fall off, the casing 36 can be reliably held in the segment 1O against the force. Furthermore, if necessary, by providing a protrusion on the outer circumferential surface of the casing, it can be held in the segment 10 more reliably.

The sleeve 38 disposed inside the casing 36 also has a cylindrical shape made of metal or engineering plastic, and has an engagement recess on its inner surface that is substantially complementary to the protrusion 26 of the engagement member. 44 is formed.

Therefore, when the protrusion 25 of the engagement member is inserted into the sleeve 38, the protrusion 26 engages with the engagement recess 44 provided on the inner surface of the sleeve.

Further, by forming a counterbore 45 on the end surface of the sleeve 38 facing the engagement member 22, when inserting the protrusion of the engagement member, the tip of the protrusion 25 is inserted into the engagement recess 44.
can be guided to the axial position of

On the other hand, as is clear from FIG. 3(b), the sleeve 38 has a slit 4 extending in its axial direction.
6 is formed, and the structure allows the sleeve 38 to expand radially outward when the protrusion 25 of the engagement member is inserted into the sleeve engagement recess 44.
To facilitate insertion of a protrusion 25.

The number of slits 46 and their extended length shall be appropriately selected according to the specifications of the segment. For example, as shown in FIG. 3(c), two to three slits 46 are , spaced apart from each other in the circumferential direction of the sleeve 38,
For those formed over the entire length, the protrusion 25
can be pushed into the sleeve 38 with a relatively small pressing force, which is advantageous for constructing relatively small tunnels.

On the other hand, as shown in FIG.
Although a relatively large pressing force is required to insert the protrusion 25 into the sleeve 38, the elastic restoring force of the sleeve 38 is also large. Since the engagement force between the protrusion 26 of the protrusion and the sleeve engagement recess 44 is also increased, this is advantageous for constructing a relatively large tunnel.

In addition, for large segments, the absolute dimensional accuracy will decrease as the size increases, so when connecting these segments, it is necessary to make adjustments, especially in the plane parallel to the segments. Considering that it is significant to take a large allowance, these slits 46 are inserted into the sleeve 3.
It is assumed that about 3 to 10 pieces are formed spaced apart from each other in the circumferential direction of 8.

On the other hand, in this embodiment, the elastic member 40 disposed between the casing 36 and the sleeve 38 disposed inside the casing 36 is preferably made of cylindrical rubber or a rubber-like elastic material. is integrally fixed to the casing 36 and the sleeve 38 by vulcanization and/or adhesive, and allows the expansion movement of the sleeve 38 under its elastic deformation, while elastically pressing the sleeve from the outside, In addition to the restoring force of 38, the engagement between the protrusion 25 of the engagement member and the sleeve 38 is made more reliable.

Note that reference numeral 48 is a retaining ring fixed to the open end of the casing 36, which holds the elastic member 40 and the sleeve 38 at predetermined positions in the casing 36, and prevents them from falling off.

Next, a description will be given of how the segments having the above structure are connected.

Segments are carried into the excavation part excavated using the cutter head of the shield machine and assembled to form segment 0, and as shown in Figure 1, the segments are already connected and form part of the tunnel. - of other constituent segments
・Position it adjacent to the end face.

Subsequently, when the shield is advanced to perform excavation using the shield jack provided thereon, the end of the jack that presses the shield in the excavation direction pushes the end face of the assembled segment NO into the excavation direction. Since it will be pressed in the opposite direction, the locking portion 24 of the segment 10 will be pressed.
Projection portion 25 of the engagement member provided on the opposing surface of the other segment
will be forced in.

In that case, the protrusion 26 of the engagement member of the other segment having a sawtooth cross-sectional shape is
8 and the elastic member 40 while expanding the sleeve 38 , and engages with a complementary-shaped engagement recess 44 formed on the inner surface of the sleeve 38 .

Therefore, adjacent segments can be connected with their respective end surfaces in close contact with each other, as shown in FIG.

At this time, the protruding part 26 of the engaging member provided on one segment is engaged with the sleeve 38 of the engaging part provided on the other adjacent segment, and the elastic member 40 and the sleeve provided on the outer periphery of the protruding part 26 are engaged with each other. It is held tightly by its own elastic restoring force. In addition, the code|symbol 18 has shown the seal ring arrange|positioned between the end surfaces of the adjacent segment 10.

Therefore, by simply placing the segments adjacent to each other and pressing the shield forward in the excavation direction, the segments can be easily connected, which greatly reduces the time required to connect the segments. Can be done.

Furthermore, in this embodiment, due to the elastic deformation of the elastic member 40 disposed between the casing 36 and the sleeve 38,
Even if the axes of the sleeve 38 and the engaging member 22 are eccentric to each other, they can be connected regardless of this.

FIG. 5 is a cross-sectional view of another locking portion 24 suitable for the connecting structure of the present invention, and the third locking portion 24, except for the elastic means 40, is
It has a similar structure to the embodiment shown in the figure.

The elastic means 40 in this embodiment is also composed of a cylindrical rubber or rubber-like elastic body, similar to that shown in FIG. The difference is that a void 50 is formed in a part.

By providing such a gap 50 in the sleeve 38, the rigidity of the elastic means in the vicinity of the gap is reduced, the deformation resistance of the elastic member in that part when the sleeve 38 is expanded is reduced, and the engagement member 22 is Projection 25
can be more easily inserted into the sleeve 38. Of course, without providing such a gap, the part of the cylindrical body located on the open end side can be made different from the rest and made of low modulus rubber or rubber-like elastic material.

Although a cylindrical member made of rubber or a rubber-like elastic body is used as the elastic member 40, it is not limited to this, and any member that can elastically support the sleeve 88 from at least its outer periphery may be used. For example, a leaf spring or the like may be used.

FIG. 6 is a diagram showing another embodiment of the present invention, in which a locking portion structure is capable of allowing not only displacement in the direction crossing the axial direction of the sleeve 38 but also displacement in the axial direction. doing.

The length of the sleeve 38 constituting such a locking portion 24 is shorter than the depth of the casing 36, and the sleeve end located on the open end side of the casing 36 has a flange portion 52.
Another elastic member 54 is provided between the end surface of the seven flange portions 52 and the retaining ring 48 fixed to the open end of the casing 36.

With this configuration, the sleeve 38 is allowed to move in its axial direction under deformation of the other elastic member. Therefore, it is possible to absorb not only the movement in the direction that intersects the axis of the segment, but also the movement in the direction of the axis, making it possible to construct segments and tunnels that are less affected by ground subsidence, earthquakes, etc. can. As the elastic member 54, not only a sheet made of rubber or a rubber-like elastic material, but also a coil spring, a plate spring, etc. can be used.

FIG. 7 shows a protrusion 26 formed on the outer periphery of the protrusion of the engaging member.
It is a figure which each shows typically the cross-sectional shape of other modified examples. Note that the engagement recess 4 formed on the inner surface of the sleeve 38
The shape of 4 shall also correspond to the shape of these protrusions.

For example, in the case of the cross-sectional shape shown in Figure (a), the protrusion consists of a substantially continuous curved part, so the force required for insertion is small, but the engagement force is also small. , the tunnel length is relatively short, suitable for areas with stable ground, and suitable for tunnels that are frequently dismantled.

The cross-sectional shape shown in FIG. 3(b) has the advantage that the insertion resistance is greater than that shown in FIG. 2(a), but the engagement force is also greater. In addition, since some relative movement in the direction of the tunnel axis is allowed, it is suitable for cases where some deviation is required.

Furthermore, the one shown in FIG. 2(c) is advantageous for application in areas where a larger engagement force is required than on the two sides.

FIG. 8 shows another embodiment of the present invention. In this embodiment, a rod-like member, preferably a steel rod 52, extends in the width direction of the segment 10, and an engaging member 22 and a locking portion 24 are provided at the ends thereof.

In this embodiment, the engaging member 22 is the one shown in FIG. 2(b) or equivalent thereto, and is a segment! This is also fixed to one end of the rod 52 embedded in the hole, which is also fixed to the fixing sleeve 34 shown in FIG. 2(b) or something equivalent thereto.

However, the one end of the rod 52 is connected to the segment 1
It is also possible to have a structure in which the protrusion protrudes outward from the end face of the 0 and a protrusion is provided at the bottom of the protrusion, and the present invention is not limited to this embodiment. In this case, it is preferable to make a part of the mouth/gudo located inside the segment 10 project outward in the radial direction to effectively prevent the rod from falling out of the segment.

On the other hand, the locking portion 24 fixed to the other end of the rod 52 has a structure practically equivalent to that shown in FIG. 3(a), FIG. 5, or FIG. It is possible to lock the engagement members of other adjacent segments that are inserted at the same time.

Incidentally, since these segments are usually made of concrete, they are said to be weaker against tensile force than compressive force, but according to this embodiment, the rod 52 embedded in the segment Since it functions to resist the applied tensile force, it is possible to obtain a segment that is strong not only in compressive force but also in tensile force. Of course, a desired tensile force can be achieved by appropriately changing the material of the rod and its outer diameter.

It should be noted that the present invention is not limited to these embodiments, and may be configured such that the engaging member and the locking portion are simultaneously arranged on each end face of the segment, and various changes are possible within the scope of the claims. .

(Effects of the Invention) As described in detail below, according to the connection structure of the present invention, each segment can be placed adjacent to each other and connected by pressing in the axial direction. There is no need to use fastening bolts to connect the segments, and the time required to connect the segments can be significantly reduced.

In addition, for conventional structures that use bolts,
In order to secure the space necessary for the fastening, the installation position was limited to a position away from the neutral plane of the segments, and there was a problem that the opposing end faces of each segment could not be brought into close contact.However, the present invention According to the structure, since the engaging member and the locking portion can be arranged at the neutral position of the segment ring, it is possible to ensure close contact. Furthermore, the degree of freedom in designing the inside of the segment 10 also increases.

Furthermore, the engaging members and locking portions of adjacent segment rings allow relative displacement in a direction that intersects the axial direction of the tunnel, and also allow relative movement in a direction that intersects that direction, that is, in the tunnel axial direction. Since it is possible to adopt a configuration that allows the above-mentioned problems, it is possible to provide a connection structure that can cope with movements caused by ground subsidence, earthquakes, and the like.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a segment having the connecting structure of the present invention, FIGS. 2(a) and (b) are views of the engaging member shown in FIG. 1, and FIG. 3(a) is , FIG. 3(b) is a cross-sectional view of the locking portion shown in FIG. 1, and FIG. 3(b) is a sectional view taken along line ^-A in FIG.
3(c) to 3(d) are partial cross-sectional views of the sleeve applied to the locking portion shown in FIG. 3(a), each shown in °C. FIG. 4 is a segment shown in FIG. 1. FIGS. 5 and 6 are cross-sectional views showing how the rings are connected; FIGS. 5 and 6 are cross-sectional views of other locking parts of the connecting structure of the present invention; FIG. FIG. 8 is a cross-sectional view of another embodiment of the structure of the present invention, and FIGS. 9(a) and (b) are cross-sectional views of a segment ring having a conventional connection structure. FIG. 2 is a perspective view and a partially cross-sectional view showing a connected state thereof. 10... Segment 14... Bolt 20... Segment 24... Locking part 28... Buried part 32... Female thread 36... Casing 12... Insertion hole 18... Seal ring 22...Engaging member 26...Protrusions 30, 42.52...Flange portion 34...Fixed sleeve 38...Sleeve 40.54...Elastic member 44...Engaging recess 46 ... Thrib 48 ... Retaining ring 50 ... Gap 52 ... Rod

Claims (1)

[Claims] 1. In a connecting structure of segments that are adjacent to each other and form a tunnel space, a protrusion is formed on the outer periphery of the protrusion that is disposed on the end face of each segment and protrudes in the tunnel axis direction. It includes an engaging member and a locking part that locks the protrusion of an adjacent segment when the segments are connected, and the locking part has a casing embedded in the segment and a casing disposed within the casing that locks the protrusion of the protrusion. A sleeve having an engagement recess that can be engaged with the protrusion formed on the inner surface and a slit extending in the insertion direction of the protrusion formed in the peripheral wall, and an elastic member disposed between the casing and the sleeve. A segment connection structure characterized by comprising: