JP3753480B2 - Tunnel segment connection method and tunnel segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the first dovetail groove portion and the first dovetail portion are arranged so as to face each of the butting portions that are assembled adjacent to each other in the circumferential direction of the tunnel and face each other in the circumferential direction of the tunnel . Two enlarged edge portions that can be individually fitted into the first dovetail groove portion and the second dovetail groove portion from the end portion in the tunnel axial direction from the first segment main body and the second segment main body provided with two dovetail groove portions individually The connecting tool (R) is provided in the first dovetail groove part and the second dovetail groove part using a connecting tool provided on both sides and having a wider interval between the respective enlarged edges toward the front side in the insertion direction. The present invention relates to a tunnel segment connecting method in which the two enlarged edges connect the respective butted portions relatively close to each other, and a tunnel segment.
[0002]
[Prior art]
Conventionally, this kind of tunnel segment connecting method (hereinafter referred to as “segment connecting method ”) is used when connecting tunnel segment bodies adjacent in the tunnel circumferential direction.
Now, the already constructed segment is referred to as an existing segment main body, and the two tunnel segment main bodies connected to the existing segment main body in the longitudinal direction of the tunnel are referred to as a first segment main body and a second segment main body. The first segment body and the second segment body are adjacent to each other in the tunnel circumferential direction, and the first segment body is attached to the existing segment body first.
Conventionally, a wedge-shaped connector having a pair of enlarged edges is inserted into the dovetail portions provided in the first segment body and the second segment body, and the two segment bodies are attracted to each other and connected. There is a way . In this case, the first segment main body is attached to the existing segment main body in a state in which the connector is inserted into the dovetail portion of the first segment main body in advance, and then, with respect to the first segment main body and the connector. In many cases, a so-called leading system is used to attach the second segment body.
[0003]
[Problems to be solved by the invention]
However, the conventional prior art method has the following problems.
For example, when the first segment main body is attached to the existing segment main body, depending on the posture of the first segment main body, the connector may drop from the dovetail groove, which hinders the work of attaching the first segment main body. There was a case where
Further, when the second segment body is attached, when the second segment body abuts on the connector, the connector exerts a force sufficient to attract the first segment body and the second segment body. Before doing so, the connector is pushed into the existing segment body. That is, in the state where the attachment of the second segment main body is completed, in most cases, the connector is in a position where it abuts on the existing segment main body. In this case, it is desirable that the interval between the dovetail groove portion of the first segment body and the dovetail groove portion of the second segment body, and the interval between the enlarged edge portions of the connector, Some error occurs. For example, when the interval between the enlarged edges is too wide, the first segment body and the second segment body cannot be sufficiently attracted. On the other hand, if the interval between the enlarged edges is too narrow, the second segment body to be attached later cannot contact the existing segment body, or the connecting tool receives an excessive tensile force in the tunnel circumferential direction. Cause inconveniences such as damage.
As described above, in the case of the tipping method, it may be difficult to obtain an appropriate connection state, and further, the attraction force by the connecting member after the second segment body is attached is measured. It was also difficult.
As described above, the connection method using the conventional connector has various disadvantages and still has room for improvement.
[0004]
The object of the present invention is to eliminate the disadvantages of the prior art, improve the efficiency of the connecting operation of the two segment bodies connected in the circumferential direction of the tunnel, and improve the reliability of the connecting portion. It is to provide a connection method and a segment for a tunnel.
[0005]
[Means for Solving the Problems]
(Configuration 1)
In order to achieve this object, the segment connecting method according to the present invention, as described in claim 1, is configured such that one of the enlarged edges of the connector is a set of the first segment body and the second segment body. prior to attaching, with stop member in advance the first ant groove in a state that allows the pushing movement for the first ant groove that has a feature in that holds retaining.
(Action / Effect)
With this configuration, when the first segment main body is attached to the existing segment main body, the connection tool is prevented from dropping from the dovetail groove due to the loading posture or the mounting posture of the first segment main body. The first segment main body can be attached smoothly.
[0006]
(Configuration 2)
As described in claim 2, the segment connecting method of the present invention can be used as the retaining member by inserting a foam into the first dovetail groove.
(Action / Effect)
In general, the foam can undergo a large volume shrinkage. Therefore, even when the retaining member made of a foam is inserted into the first dovetail groove portion, there is no obstacle when the connecting member is pushed into the existing segment body later.
Further, if the retaining member is formed of a deformable foam, not only the operation of fitting the retaining member into the first dovetail portion is facilitated, but also the retaining member is installed inside the first dovetail portion. Since it is not necessary to form it in exact conformity with the shape, the productivity of the retaining member and the workability related to the attachment of the retaining member are improved.
[0007]
(Configuration 3)
Furthermore, as described in claim 3, the segment connecting method of the present invention is capable of coming into contact with an existing segment body adjacent in the tunnel axial direction at the rear end in the fitting direction of the connecting tool, and the first segment body. and a second segment body may have been provided with deformable projection member when subjected to a load above a certain level from the existing segment body when pressed against the existing segment body.
(Action / Effect)
According to the segment coupling method in which the protruding member is provided as in this configuration, when the second segment body is pressed against the existing segment body, the second segment body and the coupling tool are The contact start position can be set on the front side in the insertion direction of the second segment body. That is, the contact start position can be set on the back side in the insertion direction of the dovetail groove related to the first segment body.
This is effective, for example, when the total width of the dovetail portions related to the first segment body and the second segment body to be sandwiched is smaller than the distance between the enlarged edge portions of both of the connectors. In this case, when the connector is pushed by the second segment body, the connector temporarily stops at a position where the projecting member comes into contact with the existing segment body. In this state, the second segment main body has not yet contacted the existing segment main body. Further, when the second segment main body is pushed in and the pressing force by the second segment main body exceeds the force necessary for the deformation of the protruding member, the connecting tool absorbs the dimensional error between both dovetail portions, Move to the existing segment. At this time, the connector can attract the first segment body and the second segment body with a substantially constant tensile force.
As described above, according to the segment connection method of the present invention, the segment main bodies can be connected to each other with a substantially constant fastening force while allowing a manufacturing error of the dovetail portion or the connector itself to a certain range. The reliability of the connecting portion can be improved.
[0008]
(Configuration 4)
In the segment connecting method of the present invention, as described in claim 4, the protruding member can be formed of a hollow member having a substantially cylindrical shape and provided at the end of the enlarged edge portion.
(Action / Effect)
With this configuration, the projecting member can be configured very simply, but has a deformation characteristic that a substantially constant compressive resistance force can be generated over most of the deformation process when compressively deforming. As a result, the compression stroke of the projecting member can be set large, and the manufacturing error of the connector can be allowed to a relatively large range.
Moreover, since the structure of the said protrusion member is simple, the design and manufacture of the said member become easy.
(Configuration 5)
The tunnel segment according to the present invention is a tunnel segment used in the tunnel segment connecting method according to any one of claims 1 to 4 as described in claim 5, and is provided at both ends in the tunnel circumferential direction. The butt grooves of the segment main bodies formed in each are provided with connecting dovetail grooves, and provided with connecting tools provided on both sides with expansion edges that can be fitted into the dovetail groove parts, and the connecting tools are connected to the respective expanding edge parts. The gap between each other is formed so as to become wider toward the front side in the insertion direction, and one enlarged edge portion of the connecting tool is pushed into the dovetail groove portion by using a retaining member in one dovetail groove of the segment body. It is characterized in that it is retained and retained in an allowable state .
(Configuration 6)
As described in claim 6, the tunnel segment according to the present invention is configured such that the retaining member includes one of the dovetail portion of the segment body and a trunk portion that connects the enlarged edge portions of the connector. It may be placed between them.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Connector and dovetail part)
The outline of the method for connecting the tunnel segments of the present invention is shown in FIG. 1, and the appearance of the connector R used in the present invention is shown in FIGS.
The connector R has a substantially rectangular shape, and enlarged edges 1 are formed at both edges along the insertion direction of the connector R, and both the enlarged edges 1 are plate-shaped body portions. 2 are connected. The two enlarged edges 1 are inserted into the first segment main body S1 and the second segment main body S2, respectively, so that both the segment main bodies S1 and S2 can be attracted and connected to each other in the insertion direction rear side of the connector R. It is formed in a tapered shape.
[0010]
The connector R used in the present invention includes a protruding member T that can contact the existing segment body S at the rear end in the insertion direction.
As shown in FIG. 2, the projecting member T is formed of, for example, a hollow cylindrical member. The projecting member T is attached to the end portion on the rear end side in the fitting direction of the connector R among both end portions of the one enlarged edge portion 1. As shown in FIG. 2, the attachment may be performed by forming a recess 3 at the rear end of the enlarged edge 1 and inserting and fixing the protruding member T, or may be performed using an adhesive.
The protruding member T is compressible and deformable as shown in FIG. 3 when the connector R is pressed against the existing segment body S with a predetermined pressing force. That is, when the projecting member T is compressed and deformed, the connector R moves toward the existing segment main body S, and as described later, the first segment main body S1 and the second segment main body S2 are applied with a substantially constant force. Attach and connect.
[0011]
(Concatenation operation)
When attaching the first segment main body S1 and the second segment main body S2 to the existing segment main body S, a leading method is used in which the connector R is attached to the first segment main body S1 in advance.
When attaching the connector R to the first segment body S1, as shown in FIG. 4, the enlarged edge portion 1 on the side where the projecting member T is not provided is used as the first dovetail portion of the first segment body S1. The side where the projecting member T is provided is exposed after being inserted. That is, when the projecting member T is provided on the enlarged edge portion 1 on the pressing side, when the second segment body S2 is pressed later, the direction in which the pressing force of the second segment body S2 acts is substantially extended. This is because the protruding member T can be positioned on the upper side, and it is convenient that the connecting tool R is not easily rotated by the pressing of the second segment body S2.
[0012]
In the case of using the leading method, when the first segment body S1 is attached to the existing segment body S, the connector R is attached to the first segment body S1 due to the loading posture or the mounting posture of the first segment body S1. There is a case where it falls off from the one dovetail groove M1. In the segment connecting method of the present invention, in order to prevent this, the connecting member R is fixed to the first dovetail groove M1 using the retaining member 4.
The retaining member 4 is formed using, for example, a foam, and is fitted into the cylindrical groove portion M1a, particularly, of the cylindrical groove portion M1a and the flat groove portion M1b constituting the first dovetail groove portion M1. In general, the foam can undergo a large volume shrinkage. Therefore, if the retaining member 4 is made of a foam, the presence of the retaining member 4 is not an obstacle even when the connector R is pushed into the existing segment body S when the second segment body S2 is pushed. It will not be. Further, if the retaining member 4 is formed of a deformable foam, not only the operation of fitting and securing the retaining member 4 into the first dovetail groove M1 is facilitated, but the retaining member 4 is attached to the first member. It becomes unnecessary to form the dovetail groove portion M1 so as to exactly match the inner shape, and the productivity of the retaining member 4 and the workability related to the attachment of the retaining member 4 are improved.
The retaining member 4 is preferably disposed on both sides of the connector R in order to prevent the connector R from sliding inside the first dovetail groove M1.
[0013]
The connection process of the first segment body S1 and the second segment body S2 using the connector R is shown in FIGS.
FIG. 5 (a) shows that the second segment body is compared with the first segment body S1 that has already been constructed and the connector R that is inserted into the first dovetail groove M1 of the first segment body S1. The process of making S2 approach is shown. In this process, the connector R and the second segment body S2 are not yet in contact with each other. The connector R is fixed by the retaining member 4 so as not to move inside the first dovetail groove M1.
FIG. 5B shows a state in which the pressing of the second segment main body S2 has progressed and the second dovetail groove portion M2 is in contact with the enlarged edge portion 1 of the connector R.
Further, when the second segment main body S2 is pushed into the existing segment main body S side, a slip occurs between the first dovetail groove portion M1 and the enlarged edge portion 1, and the connecting tool R has a protruding member T. Slides along the first dovetail groove M1 until the leading end of the segment contacts the existing segment body S. Along with this sliding, there is a margin in the width of the portion projecting from the first segment body S1 of the body portion 2 of the connector R. Therefore, the second segment body S2 is further moved to the existing segment body S side. Intrusion is possible.
FIG. 5C shows a state in which the tip of the protruding member T of the connector R that has slid is in contact with the existing segment body S. Along with this sliding, the retaining member 4 is compressed and deformed. However, since the retaining member 4 is made of a foam or the like, the compression deformation is easily performed.
When the second segment main body S2 is continuously pushed in, the second segment main body S2 further enters, and the contact force between the first segment main body S1 and the second segment main body S2 increases. However, at this stage, the projecting member T is not compressed and deformed. That is, since both of the enlarged edge portions 1 are tapered, most of the force pressing the second segment main body S2 against the existing segment main body S is caused by the two segment main bodies S1 and S2. It becomes a component to attract. For this reason, the component force which presses the said connection tool R to the said existing segment main body S side has not yet increased to the force required in order to compressively deform the said protrusion member T. FIG.
When the component force that further pushes the second segment body S2 and presses the connector R against the existing segment body S increases until the projecting member T can be compressed and deformed, the projecting member T is compressed and deformed. And eventually causing out-of-plane deformation, the connector R moves to the existing segment body S side. As a result, since the connecting tool R moves to the side where the width of the flat groove portion M1b related to the first dovetail groove portion M1 is narrow, there is a margin in the space between the two enlarged edge portions 1, and the second segment body S2 Invades further. In this state, the attractive force between the first segment body S1 and the second segment body S2 is kept substantially constant.
[0014]
Here, the situation where the protruding member T is compressed and deformed will be described.
For example, the deformation characteristics of the cylindrical member 5 having the shape shown in FIG. 6 are shown in FIG. When the cylindrical member 5 is compressed in the axial X direction of the cylindrical member 5, the cylindrical member 5 is compressed and deformed in the axial X direction at the initial stage, that is, from the origin 0 to the point a. When the compressive load P reaches the point a, the cylindrical member 5 starts to be deformed out of plane. Thereafter, as shown from point a to point b, even if pressing is continued for a while, the load P applied to the cylindrical member 5 does not increase, and only out-of-plane deformation proceeds. When the point b is reached, the out-of-plane deformation turns into a buckling, and the load P applied to the cylindrical member 5 decreases abruptly to the point c. At the point c, the deformation of the cylindrical member 5 is almost completed, and after that, even if the pressing is continued, no compression deformation occurs and only the load P increases.
In the present invention, among the deformation characteristics of the cylindrical member 5, the characteristics from point a to point b are used. That is, when the component force that presses the connector R against the existing segment main body S side out of the load P for pressing the second segment main body S2 is equal to the load P between the points a and b, The taper angle or the like of the enlarged edge 1 is set so that the component force for attracting the two segment main bodies S1 and S2 becomes a predetermined load.
However, in the present embodiment, as shown in FIG. 3 or FIG. 4, a protruding member T provided with a flange 6 at the center is used. If it is this structure, it becomes the shape which connected the said cylindrical member 5 two, and can ensure long deformation stroke which can generate | occur | produce a fixed deformation resistance. As a result, even when the connector R has a relatively large manufacturing error, the segment main bodies S1 and S2 can be connected to each other with a substantially constant attractive force.
The protruding member T can be formed using a material that is relatively easily deformed, such as aluminum, copper, lead, or a thin steel material. That is, since these materials are stable in plastic deformability, the protruding member T having a desired deformability can be easily obtained.
[0015]
FIG. 5D shows a state in which the second segment main body S2 pushed further toward the existing segment main body S is in contact with the existing segment main body S. That is, the normal connection process is completed.
[0016]
When the total width of the width of the flat groove portion M1b related to the first dovetail groove portion M1 and the width of the flat groove portion M2b related to the second dovetail groove portion M2 is narrower than the distance between the two enlarged edge portions 1 In a state where the protruding member T is not so compressed and deformed, the connection between the segment bodies S1 and S ends.
FIG. 8 is a view showing a state in which the protruding member T is not compressed and deformed at all. This is a case where the total width of both the flat groove portions M1b and M2b is narrow with respect to the distance between the two enlarged edge portions 1. It indicates an acceptable limit.
On the contrary, FIG. 9 shows an example in which the projecting member T is completely compressed and deformed to complete the connection. This indicates an allowable limit in the case where the total width of both the flat groove portions M1b and M2b is wide with respect to the distance between the two enlarged edge portions 1.
[0017]
In the conventional tipping system, when the total width of the two flat groove portions M1b and M2b and the distance between the two enlarged edge portions 1 do not match, the two segment main bodies S1 and S2 are appropriately connected. It was impossible to do. For example, when the total width of both of the flat groove portions M1b and M2b is narrow, there arises a disadvantage that the connector R is left loose in both the first and second dovetail groove portions M1 and M2. It was.
However, as is apparent from the examples shown in FIGS. 8 and 9, when the connector R of the present invention is used, the manufacturing error of the first and second dovetail grooves M1 and M2 or the connector R itself is limited to a certain range. While permitting, the first and second segment bodies S1, S2 can be connected with a substantially constant fastening force.
[0018]
The above description mainly relates to the connecting process related to the dovetail groove portions M1 and M2 on the existing segment ring side among the dovetail groove portions M1 and M2 of the first and second segment bodies S1 and S2. However, the fastening procedure is the same for the other dovetail grooves M1 and M2. That is, as shown in FIG. 4, the connector R1 to be inserted into the already constructed segment ring, the connector R1 being pushed in at the side of the first segment body S1 or the second segment body S2. The operating principle is the same.
[0019]
(Manufacturing tolerances for connectors, etc.)
The range of the manufacturing error that can be allowed by the connector R and the like is considered to be a range covering the example of FIG. 8 and the example of FIG. 9 as described above.
In order to simplify the explanation, it is assumed that there is no manufacturing error of the connector R, and there is no error in the taper angles of the dovetail portions M1 and M2 of the first segment body S1 and the second segment body S2. And That is, it is assumed that a manufacturing error occurs only in the width of the flat groove portions M1b and M2b in each of the first segment body S1 and the second segment body S2.
First, as in the example shown in FIG. 8, a case where the total width of the flat groove portions M1b and M2b is narrower than the distance between the enlarged edge portions 1 of both of the connectors R will be considered. In this case, with regard to the interval between the enlarged edge portions 1, in particular, the interval at the end portion on the side where the protruding member T is provided is D ₀ . On the other hand, regarding the total width of the flat groove portions M1b and M2b, let D be the total width at the end portion in contact with the existing segment body S.
The difference between the total width D and the distance D ₀ can be obtained from the protruding length H of the protruding member T and the taper angle formed by one of the enlarged edges 1 with the insertion direction of the connector R.
When the taper angle is L: 1,
The minimum value _Dmin that the total width D can take is:
D _min = D ₀ −H × (1 / L) × 2 − (1)
It is.
On the other hand, as in the example shown in FIG. 9, when the total width D is wide, the length in the pushing direction when the projecting member T is subjected to the maximum compression deformation is h.
_{D max = D 0 - h ×} (1 / L) × 2 - (2)
It is.
Therefore, from Equation (1) and Equation (2) , the range that the total width D can take is
D _max −D _min = (H−h) × 2 / L− (3)
It becomes.
As described above, when the connector R of the present invention is used, a manufacturing error of the first dovetail groove portion M1 and the second dovetail groove portion M2 or a manufacturing error of the connector R itself is allowed within a certain range. can do. This is to improve the productivity of the first and second segment bodies S1 and S2 as compared with the case of using the conventional connector R in which the manufacturing error of the connector R is not allowed in principle. is there.
As described above, according to the tunnel segment connecting method of the present invention, the connecting operation of each of the two segment main bodies S1 and S2 connected in the circumferential direction of the tunnel is significantly efficient including the productivity of the segment main bodies. And the reliability of the connecting portion can be improved.
[0020]
[Another embodiment]
<1> In the above embodiment, the retaining member 4 is provided in the cylindrical groove portion M1a of the first dovetail groove portion M1, but the present invention is not limited to this embodiment, and the retaining member as shown in FIGS. 10 and 11 4 may be provided inside the flat groove portion M1b.
As the retaining member 4A in this case, a foam can also be used. Then, the retaining member 4A is attached between the flat groove portion M1b of the first segment body S1 and the body portion 2 of the connector R. At this time, it is arbitrary whether the retaining member 4A is attached on both sides of the body 2 or only on one side. However, it is possible to effectively prevent the connector R from being fixed in a state of being rotated around the cylindrical groove portion M1a of the first segment body S1 when attached to both sides. The mounting of S2 is easier and more preferable.
[0021]
<2> In the above embodiment, the protruding member T is provided only on one side of the two enlarged edge portions 1, but may be provided on each of the two enlarged edge portions 1.
In this case, the total load necessary for compressing and deforming each projecting member T is set equal to the load necessary for compressing and deforming the single projecting member T in the above embodiment.
[0022]
In the claims, reference numerals are used for convenience of comparison with the drawings. However, the present invention is not limited to the configurations of the accompanying drawings.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a method for connecting tunnel segments according to the present invention. FIG. 2 is a plan view showing a connector according to the present invention. FIG. 3 is an explanatory diagram showing a projecting member after deformation. Explanatory drawing showing the process of connecting the second segment main body [FIG. 5] Explanatory drawing showing the details of the process of connecting the second segment main body [FIG. 6] A perspective view showing the cylindrical member [FIG. 7] Compressing and deforming the cylindrical member Explanatory diagram showing the relationship between the amount of compressive deformation and the load at the time. [FIG. 8] Explanatory diagram showing an example of the connected state when there is a manufacturing error in the connected part. Explanatory drawing which shows another example of FIG. 10 is a cross-sectional plan view showing a fixing manner of a connector according to another embodiment. FIG. 11 is a longitudinal sectional view showing a fixing manner of the connector according to another embodiment. ]
DESCRIPTION OF SYMBOLS 1 Enlarged edge part 4 Stopping member S1 1st segment main body S2 2nd segment main body M1 1st dovetail groove part M2 2nd dovetail groove part R Connecting tool S Existing segment main body T Protruding member

Claims (6)

The first dovetail groove portion (M1) and the second dovetail portion are opposed to each of the butted portions that are assembled adjacent to each other in the circumferential direction of the tunnel and face each other in the circumferential direction of the tunnel . The first segment main body (S1) and the second segment main body (S2) in which the dovetail groove (M2) is individually provided ,
Two enlarged edge portions (1, 1) that can be respectively fitted into the first dovetail groove portion (M1) and the second dovetail groove portion (M2) from the end in the tunnel axial direction are provided on both sides, and the respective enlarged edges Using a connector (R) that is configured so that the interval between the parts (1) is wider toward the front side in the insertion direction ,
By inserting the connecting tool (R) into the first dovetail groove portion (M1) and the second dovetail groove portion (M2), the two enlarged edge portions (1, 1) can relatively move the respective butted portions. A method for connecting tunnel segments connected in a state close to
Prior to the assembly of the first segment body (S1) and the second segment body (S2), one of the enlarged edge portions (1) of the connector (R) is preliminarily formed in the first dovetail groove portion (M1). ) using a stop member (4) in a state that allows the pushing movement for the first ant groove (M1), method of connecting segment tunnel to hold the retainer. The method for connecting tunnel segments according to claim 1, wherein the retaining member (4) is a foam fitted into the first dovetail groove (M1). It is possible to contact the existing segment body (S) adjacent to the tunnel axis direction at the rear end in the fitting direction of the connector (R), and the first segment body (S1) and the second segment body (S2). tunnel description deformable projecting member (T) in claim 1 or 2 preferably provided when subjected to a load above a certain level from the existing segment body (S) when pressing the existing segment body (S) Segment consolidation method . 4. The method for connecting tunnel segments according to claim 3, wherein the projecting member (T) is a member having a hollow substantially cylindrical shape provided at an end of the enlarged edge portion (1). A tunnel segment used in the tunnel segment connection method according to any one of claims 1 to 4,
Tunnel in the circumferential direction of the segment body each other formed on both ends butt portions respectively, the connecting dovetail groove portion is provided, coupling with freely enlarged edge fitted into the dovetail groove a (1,1) on both sides (R ), And the connecting tool (R) is formed such that the interval between the enlarged edge portions (1, 1) becomes wider toward the front side in the insertion direction, and one connecting edge of the connecting tool (R) is formed. part of (1), wherein one of said segments body using stop member (4) in the dovetail groove portion, in a state that allows the pushing movement against the ant groove, a segment tunnel that is held retaining. The retaining member (4A) is disposed between the one dovetail portion of the segment body and the trunk portion (2) connecting the enlarged edge portions (1, 1) of the connector (R). 6. The tunnel segment according to claim 5, which is arranged.

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