JP2011021352A - Construction set and bag body for injecting back-filling material, segment, and method for constructing tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily complete a segment with a bag body, to which the bag body is bonded on a job site; and to construct a tunnel while preventing a back-filling material etc. from flowing out ahead of the outside of a shield machine and flowing in ahead of the inside of the shield machine, without damaging the bag body. <P>SOLUTION: The bag body for back-filling is bonded to an outer peripheral surface of the segment by means of an adhesive on the job site, so that the segment with the bag body can be easily completed. This makes it unnecessary to take the trouble to work the segment itself so that the bag body for back-filling can be provided, and enables the manufacturing cost of the segment itself to be kept low. Additionally, since a protective sheet material is stuck on the bag body for back-filling, the bag body for back-filling can be used without being damaged by a tail brush which is provided in the shield machine; and the bag body can be expanded by injecting the back-filling material into the bag body, so as to fill a void between the bag body and an inner surface of natural ground in the bored tunnel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a ring formed by segments along a tunnel excavated by an excavator to fill a gap between the segment and an inner surface of a natural ground of the excavated tunnel. The present invention relates to a bag body, a segment to which the bag body is attached, and a tunnel construction method using the segment.

  Conventionally, in a shield method in which a tunnel is constructed using a shield excavator, a ring is formed by connecting segments in a circumferential direction, and the ring is continuously joined along the excavated tunnel. Install. Then, a backfill material is injected into a gap between the segment constituting the ring and the inner surface of the natural ground of the tunnel excavated by the shield excavator and hardened to prevent the natural ground from collapsing.

  However, in the conventional construction method, when the backfilling material is injected, the backfilling material flows out to the face portion in front of the shield excavator, and the backfilling material flows out to the face portion. There is a risk that the amount of curing will decrease, the gap cannot be filled firmly, and the ground will collapse.

  In addition, the tail void is larger at the sharply curved part where the direction of excavation changes abruptly than at the straight part. Even if the backfilling material is injected into the tail void in the same way as the straight part, There is a problem that the material flows out forward of the shield excavator.

  In addition, a tail brush with grease is provided on the inner surface of the tail portion of the shield excavator, and the contact portion of the tail brush contacts the outer peripheral surface of the segment, so that the backfill material into the shield excavator can be obtained. And inflow of groundwater.

  In addition, if the same segment as the straight part is used at the sharply curved part, the tail part of the shield excavator makes contact with the segment when the shield excavator bends the curved part, and the shield excavator itself follows the curve. May not bend. For this reason, in the curved portion, a segment smaller than the segment used in the straight portion (reduced diameter segment) is used, and a ring smaller than the diameter of the ring used in the straight portion is assembled to construct the tunnel.

  As a result, unlike the tunnel construction in the straight portion, the ring diameter is smaller in the curved portion than in the straight portion (the segment becomes smaller), so that the tail brush cannot contact the outer peripheral surface of the segment. A gap is created between the segment and the segment. As a result, a backfill material flows into the gap, adheres to the contact portion of the tail brush, and hardens over time. When the backfill material hardened at the tail brush portion cracks, there arises a problem that groundwater, earth and sand, etc. flow from the portion into the front of the excavator.

  Therefore, in order to solve the various problems described above, a bag body is provided in advance in the segment, a backfill material is injected into the bag body, the bag body is inflated, and excavated by the segment and shield excavator. There has been provided a technique for filling a gap with the inner surface of a natural ground of a tunnel (Patent Document 1).

  However, in order to provide a bag body in a segment, the said technique has to process a segment main body, The processing cost starts, There exists a problem that the completed segment with a bag itself becomes expensive.

  In addition, a technique is also provided in which a bag body can be handled in a state separated from a segment body, and the bag body is attached to the segment body at a construction site to form a segment with a bag (Patent Document 2).

However, this technique also has a problem in that in order to provide a bag in the segment, it is necessary to process the recess (3) in the segment body (2), which increases the processing cost.
In addition, when attaching the bag body (4) to the segment body (2), after the bag body (4) is fitted into the recess (3), the bag body (4) is attached to the segment body (2). For fixing, the mouth portion (9) must be inserted and fixed through the through hole (11), and the attachment string (10) must be attached to the segment body (2) using appropriate means (paragraph 0025). ), There is a problem of lowering work efficiency.

  Further, since the bag body (4) is fitted into the recessed portion (3) of the segment body (2), the covering formed on the outer peripheral surface of the segment (1) and the surface of the bag body (4) (6 ) Between them. Therefore, when the tail brush passes through the step, an impact (pressure) from the tail brush is applied to the bag body (4). Further, the cover (6) covers the bag (4), but is not fixed by being attached to the segment, so that it may be dragged by the tail brush.

  The present invention was made in view of the above-described background art and the existence of the problems of the background art, and the problem was that the bag body was attached at the construction site without processing the segment body. The segment can be completed easily, and the bag body is not damaged by the passage of the tail brush, and the backfilling material or the like is prevented from flowing out or inflowing to the front outside and inside the shield excavator. It is to provide a backfilling material injection set, a backfilling material injection bag, a segment, and a tunnel construction method using them.

  In order to solve the above problems, the first aspect of the present invention is to protect the backfilling material injection bag provided on the outer peripheral surface of the segment constituting the tunnel, and the backfilling material injection bag A backfilling material injecting construction set comprising a set of protective sheets, wherein the backfilling material injecting bag body is provided on an adhesive surface that can be bonded to an outer peripheral surface of the segment by an adhesive, and the segment. A hole for communicating with the backfill material injection hole, and the protective sheet is used by being attached to the segment so as to cover the backfill material injection bag body adhered to the segment. It is what is made.

According to this aspect, since the bonding surface of the backfilling bag body is adhered to the outer peripheral surface of the segment with an adhesive at the construction site, the bag-attached segment can be easily completed. It is not necessary to process the segment itself so that the backfilling material injection bag can be integrally provided in the segment. Therefore, the cost increase of the segment itself can be suppressed.
In addition, since the protective sheet covers the backfilling material injection bag and is attached to the segment, the backfilling material injection bag is damaged as the tail brush provided on the shield excavator passes. It is never done.

  Furthermore, as the protective sheet, a thin one (usually 1 mm or less) such as a general adhesive tape can be used. Therefore, the tail brush is hardly affected by the step based on the thickness of the protective sheet, and is in contact with the surface of the protective sheet attached to the outer peripheral surface of the segment from the position in contact with the outer peripheral surface of the segment. It is possible to smoothly shift to the position of the state.

  In addition, the force (contact pressure) acting on the protective sheet when the tail brush moves in contact with the protective sheet acts in a direction that increases the sticking of the protective sheet to the outer peripheral surface of the segment. Therefore, even if the sticking force of the sticking surface of the protective sheet is not so large, it is possible to realize a state in which the protective sheet is firmly stuck to the outer peripheral surface of the segment, and accordingly, with the passage of the tail brush. Therefore, the protective sheet is not easily displaced.

  Then, the tail brush smoothly transitions from the contact state at the above position to the position of the contact state with the surface of the corresponding protective sheet on the backfill material injecting bag body bonded to the outer peripheral surface of the segment. . Thereafter, the tail brush passes the region where the bag is present, the surface of the protective sheet on which the protective sheet is directly attached to the segment outer peripheral surface, and then the segment outer peripheral surface which passes the region where the protective sheet exists. It moves through each position of the direct contact position sequentially.

  After the tail brush passes through the position of the bag body and the protective sheet, the backfill material is injected into the bag body, and the bag body expands. The swelling force when the bag body is inflated acts on the protective sheet in the direction of peeling the protective sheet. Therefore, even if the “sticking force” is large to some extent, the protective sheet can be removed without difficulty while the bag body swells.

  As can be understood from the above description, the “sticking force” of the protective sheet to the bag body and the outer peripheral surface of the segment is easily peeled off by the swelling force when the bag body swells, The sheet is set to such an extent that the sheet is not easily displaced. As described above, since the force (contact pressure) acting on the protective sheet when the tail brush moves is in a direction in which the protective sheet sticks to the outer peripheral surface of the segment, this is taken into consideration. Thus, the “sticking force” can be set to be weaker, and as a result, it can be more easily peeled off by the swelling force of the bag body.

  According to a second aspect of the present invention, there is provided a backfilling material injecting bag provided on an outer peripheral surface of a segment constituting a tunnel, the bag being an adhesive surface that can be adhered to the segment with an adhesive. And a hole communicating with the backfilling material injection hole provided in the segment, and an adhesive penetration preventing material is provided inside the bag body. .

  According to this aspect, the bonding surface of the backfilling bag body can be easily bonded to the outer peripheral surface of the segment with the adhesive on site, so that the work efficiency is good. Further, since the adhesive penetration preventing material is provided inside the backfill injection bag body, the adhesive that has penetrated into the lower surface portion of the backfill injection bag body due to adhesion with the segment does not penetrate to the upper surface portion. Therefore, it can prevent that the lower surface part and upper surface part of the bag body for backfilling injection | pouring adhere | attach with an adhesive agent.

  According to a third aspect of the present invention, there is provided a segment constituting the tunnel, wherein the back-filling material injecting bag of the first aspect is adhered to the outer peripheral surface of the segment with an adhesive, and the protection of the first aspect A sheet is attached to the outer peripheral surface of the segment so as to cover the backfill material injecting bag bonded to the segment.

  According to this aspect, the same effect as in the first aspect can be obtained.

  A fourth aspect according to the present invention is the segment according to the third aspect, wherein the protective sheet covers a part of the back side in the tunnel extending direction of the bonded backfilling material injection bag. And affixed to the segment.

According to this aspect, when injecting a backfill material into the bag body to inflate the bag body, the bag body is easier to inflate than the case where the entire surface is covered, and is protected along with the expansion of the bag body. The effect of peeling off the sheet with less resistance is obtained.
Since the protective sheet covers only a part rather than the entire surface of the bag body, the tail brush comes into direct contact with the bag body when the tail brush reaches an area where the protective sheet is not provided. . However, the present inventors have confirmed that even with this “partially covered” structure, if the protective sheet covers a part of the rear side in the tunnel extending direction, it can be practically performed without any problem. is doing.

  According to a fifth aspect of the present invention, there is provided a tunnel construction method for making a tunnel by excavating a shield excavator, and bonding a back filling material injection bag body with an adhesive to an outer peripheral surface of a segment constituting the tunnel. A first step, a second step of covering the backfilling material injecting bag bonded to the outer peripheral surface of the segment and attaching a protective sheet to the outer peripheral surface of the segment, and a tail portion of the shield excavator After the tail brush is passed through the backfilling material injecting bag covered with the protective sheet, the backfilling material injecting is communicated with the hole from the backfilling material injecting hole provided in the segment. And a third step of peeling the protective sheet while inflating the bag body by injecting a backfill material into the hole of the bag body.

According to this aspect, since the segment with the bag body for injecting the backfill material can be easily completed at the site where the tunnel is constructed, it is not necessary to process the segment itself, and the cost of the segment itself is suppressed. Can do.
In addition, the same effects as those described in the description of the effects of the first aspect can be obtained. That is, it is possible to easily complete a segment with a bag at the construction site without adding any processing to the segment body, and without causing damage to the bag by passing the tail brush. Outflow or inflow of the backfilling material or the like to the outside front and the inside front can be prevented.

  According to a sixth aspect of the present invention, in the tunnel construction method according to the fifth aspect, the second step is a rear side in the tunnel extending direction of the backfilling material injection bag body to which the protective sheet is adhered. A part of the cover is covered and attached to the segment. According to this aspect, the same effect as in the fifth aspect can be obtained, and the same effect as in the fourth aspect can be obtained.

The simplification figure of the tunnel construction method which concerns on this invention. The simplification figure of the tunnel construction method which concerns on this invention. The manufacturing process figure of the segment with a bag body for backfilling material injection concerning this invention. The other manufacturing-process figure of the segment with the bag body for backfilling material injection concerning this invention. The top view and sectional drawing of the bag concerning this invention. Sectional drawing of the process until a tail brush passes a protection sheet. Sectional drawing of the process until a tail brush passes a protection sheet. The conceptual diagram which displayed the force concerning a protection sheet by the vector. Sectional drawing when the backfilling material is not inject | poured into the bag body segment concerning this invention. Sectional drawing immediately after a backfilling material was inject | poured into the bag body segment concerning this invention, and the protection sheet peeled from the segment outer peripheral surface. Sectional drawing when the backfilling material of predetermined amount has been inject | poured into the bag body segment concerning this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 1 is a diagram schematically showing a construction situation when a tunnel is constructed. FIG. 1 shows, as an example, a case where a shield construction method is performed while overexcavation 6 is performed using a shield excavator when constructing a tunnel in a sharply curved portion in an urban area that has been increasing recently. It is. In FIG. 1, the range of X is a straight line portion, and the range of Y is a curved portion.

In FIG. 1, 1 is a shield excavator, 2 is a cutter, 3 is a soil removal mechanism, 4 is a shield jack, and 5 is a tail brush provided at the tail portion of the shield excavator.
The shield excavator 1 is provided with a cutter 2 at a front end opening so as to be rotatable. The tail excavator comes into contact with the outer peripheral surface of the segments (SE1, SE2, SE3) when the shield excavator 1 advances. A tail brush 5 for preventing materials and groundwater from flowing into the front of the shield excavator 1 is provided.

  The shield excavator 1 is equipped with a shield jack 4, and the rod 4 ′ provided on the shield jack 4 is pressed against the front end face of the segments (SE1, SE2, SE3) assembled rearwardly to the rod 4 Proceeds by receiving reaction force from the segment by extending '.

  Inside the rear part of the shield excavator 1, a normal segment (SE1) or a segment (SE2, SE3) with a backfill material injecting bag body is connected to each other in the circumferential direction, and the ring is shielded. The tunnel is constructed by continuously joining along the tunnel excavated by the excavator 1.

  Here, when constructing a tunnel in a straight portion (range of X), a tunnel is constructed by joining together rings having the same diameter formed by combining segments (using segments SE1 and SE2).

  In the construction method according to the present invention, first, the backfilling material is injected into the void from the hole 11 for injecting the backfilling material provided in the segment SE1. Next, the tail brush 5 of the shield excavator 1 passes through the segment SE1, is attached to the segment SE2 with an adhesive, and is protected by a protective sheet 20 described later (hereinafter referred to as "bag body"). ") Immediately after passing through 10 ', the back-filling material is injected into the bag body 10' from the hole 11 for injecting the back-filling material provided in the segment SE2, and inflated to fill the void. By repeating this process, the backfill material injected into the void is prevented from flowing out of the shield excavator 1 forward.

  On the other hand, when a tunnel is to be constructed in the curved portion (range Y), a segment smaller than the segment used in the straight portion (segment SE3), so-called shrinkage, is used to advance the shield excavator 1 in accordance with the bending of the curve. Using the diameter segment, the tunnel is constructed by assembling a ring smaller than the diameter of the ring used for the straight section.

  Therefore, in the tunnel construction in the curved portion using the reduced diameter segment, the tail brush 5 of the shield excavator 1 is attached to the segment SE3 (hereinafter referred to as “reduced diameter segment with bag”) with an adhesive, and the protective sheet 20 The tail void T, which is formed after passing through the bag body 10 protected by the above, becomes larger than when the tail void T is straight. Further, a gap 7 is generated between the tail brush 5 and the reduced diameter segment SE3. This state is the state of FIG.

  FIG. 2 shows the state of FIG. 1, that is, the tail brush 5 of the shield excavator 1 passes through the bag body 10 attached to the bag-reduced diameter segment SE3 with an adhesive and protected by the protective sheet 20, and then shrinks with the bag. A state in which the backfilling material is injected into the bag body 10 from the hole 11 for injecting the backfilling material provided in the diameter segment SE3 and inflated to fill the tail void T and the gap 7 is shown. As described above, when the bag body 10 swells, it is possible to prevent the backfilling material and the like from flowing out to the front outside the shield excavator or from flowing into the inside front of the shield excavator.

  In FIGS. 1 and 2, segment SE1 is a normal segment, and segment SE2 is a segment with a bag, which are alternately joined, but segment SE2 with a bag (contracted diameter segment SE3 with a bag in the curved portion) is continuous. It is good also as a structure made to join. In this case, the backfill material to be injected into the tail void is injected from a backfill material injection hole provided separately in the segment.

FIG. 3 shows an example of an embodiment of the bagged segment SE2 and the bag-reduced diameter segment SE3 used in the present invention.
The segment SE1 has an arc shape, and a hole 11 for injecting a backfilling material is provided through the front and back at substantially the center (FIG. 3A). The shape, length, and width of the segment SE1 can be adapted according to the construction site, but the outer peripheral surface of the segment SE1 is a flat surface that has not been processed such as a recess for attaching a bag. It is. Further, the material can be selected as appropriate. Here, as a segment to be used, a steel segment, an RC segment, a ductile segment, a composite segment, and the like can be used.

  Next, the bag-attached segment SE2 (bag-attached reduced-diameter segment SE3) used in the present invention will be described. The segment SE2 with bag (the reduced diameter segment SE3 with bag) of the present invention is characterized in that it can be easily completed at the construction site. Based on FIGS. 3 and 4, the process until the bag body is inflated by injecting the backfill material into the bag body 10 (10 ′) of the completed segment SE 2 with bag body (reduced diameter segment SE 3 with bag body) is completed. I will explain.

  The bag body 10 (10 ') is attached to the segment SE1 (FIG. 3A) using an adhesive (FIG. 3B). This is the first step. At this time, the hole 12 (see FIG. 4) provided in the bag body 10 (10 ') is attached so as to communicate with the hole 11 for injecting the backfill material of the segment SE1. The adhesive to be used can be selected depending on the material of the segment SE1 and the bag body 10 (10 ′), but at least when the backfill material is injected into the bag body 10 (10 ′) and inflated, the segment SE1 and the bag body 10 are used. It is necessary to have such an adhesive strength that (10 ′) does not peel off. For example, an adhesive such as an epoxy resin, an acrylic resin, or a synthetic rubber resin can be used, and an epoxy resin adhesive is preferable.

  As another aspect, an adhesive is applied in the longitudinal direction of a part of the bag body 10 (10 ′), and a bag body in which the release paper is pasted on the part is manufactured, and the release paper is on-site. May be peeled off and bonded to the segment.

  Next, the protective sheet 20 is attached to the outer peripheral surface of the segment so as to cover the entire bag body 10 (10 ') bonded to the segment (FIG. 3C). This is the second step. The arrows indicate the direction of tunnel extension.

  As described above, the protective sheet 20 is pasted so as to cover the entire bag body 10 (10 ′), so that the bag body 10 (10 ′) is damaged or segmented by the contact with the tail brush 5 due to the progress of the shield excavator 1. Can be prevented from peeling off. Therefore, the material of the surface of the protective sheet 20 is preferably as smooth as possible to reduce the friction coefficient. Further, the protective sheet 20 does not disturb the bag 10 (10 ′) when the backfill material is injected and inflated, so that the protective sheet 20 does not interfere with the outer peripheral surface of the segment and the bag 10 (10 ′). ) That can be easily peeled off. Furthermore, since the protective sheet 20 is also damp due to groundwater or the like at the construction site, a sheet that is resistant to moisture is preferable.

  FIG. 3D shows a state in which the bag body 10 (10 ′) is inflated by being filled with the backfill material, and the protective sheet 20 is peeled off from the outer peripheral surface of the segment and the bag body 10 (10 ′). Yes. This step is the third step. In this figure, the protective sheet 20 is completely peeled off from the bag body 10 (10 ′) and remains on the outer periphery of the segment on the near side of the bag body 10 (10 ′). It may be completely peeled off and remain on the bag 10 (10 ′) (FIG. 11).

  As the protective sheet 20, a smooth and thin surface is preferable. For example, the adhesive tape which apply | coated the adhesive agent to the process surface by using as a support the resin film of thickness 1mm or less which carried out the adhesion process of the single side | surface is mentioned. In addition to the adhesive tape, a thin resin sheet or the like can be used.

FIG. 4 is a mode in which only the part of the second step (FIG. 3C) is changed among the steps in the mode shown in FIG.
In this embodiment, as shown in FIG. 4 (C ′), the protective sheet 20 is attached so as to cover a part (almost half) of the back side in the tunnel extending direction of the bag body 10 (10 ′). It is. In the case of this embodiment, when a backfilling material is injected into the bag body 10 (10 ′) to inflate the bag body 10 (10 ′), the bag body 10 (10 ′) is entirely covered. The protective sheet 20 is peeled off with less resistance as the bag 10 (10 ') bulges.

Next, the bag and the protective sheet according to the present invention will be described in detail with reference to FIGS.
First, the bag according to the present invention will be described with reference to FIG.

  The ring placed in the tunnel is constructed by connecting the segments circumferentially to each other, but when the backfill material is injected into the bag attached to the segment, the bag fills the tail void. In addition, it is required to sufficiently swell so as not to create a gap in the connecting portion of the segments. Further, the strength is required to withstand the injection pressure when the backfill material is injected and the weight of the backfill material after the injection. The bag of the present invention satisfies such conditions. Examples of the backfill material to be injected into the bag include mortar, plastic grout, and other solidifying materials. Hereinafter, the bag body will be described.

FIG. 5 shows an embodiment of the bag 10 (10 ′) according to the present invention.
FIG. 5 (A) is a plan view of the first embodiment, and FIG. 5 (A ′) is a cross-sectional view of the bag 10 (10 ′) cut at a portion D in FIG. 5 (A).

  The bag body 10 (10 ') is made of a woven fabric. One end portion and the other end portion of the fabric are overlapped and sewn along the end side (13), and further, both end portions are sewn ( 14) It has a cylindrical shape. Moreover, the hole 12 for inject | pouring backfilling material from the hole 11 of segment SE2 (or diameter reduction segment SE3) is provided.

  The yarn constituting the fabric of the bag body 10 (10 ') is not particularly limited. Synthetic fibers, natural fibers, or a blend of these may be used. For example, nylon, polyester, urethane, cotton, hemp, etc. are raised. However, in order to prevent the backfill material from flowing too much in the circumferential direction of the segment when the backfill material is injected, it is preferable that the yarn used in the circumferential direction is not stretchable. This is because if the backfill material flows too much in the circumferential direction of the segment, the bag body 10 (10 ') does not swell well. On the other hand, the yarn used in the same direction as the tunnel extending direction may be stretchable. Further, the structure of the woven fabric is not particularly limited as long as it is a general structure such as a plain weave or a twill weave.

  Note that the bonding portion (bonding area) between the bag body 10 (10 ') and the segment SE1 can be selected according to the situation at the site. In FIG. 5 (A ′), the bonding portion 15 which is a bonding surface in the present invention is a part of the lower surface portion of the bag body 10 (10 ′), but may be the entire lower surface portion. However, it is preferable that the bag-attached segment SE2 (or the bag-attached reduced diameter segment SE3) is uniformly bonded in the circumferential direction.

FIG. 5 (B) is a plan view of the second embodiment, and FIG. 5 (B ′) is a cross-sectional view of the bag 10 (10 ′) cut at a portion E in FIG. 5 (B).
The second embodiment is the same as the first embodiment except that the release paper 16 is provided in the bag.

  The role of the release paper 16 is that when the lower surface portion of the bag body 10 (10 ′) and the segment SE2 with bag body (or the reduced diameter segment SE3 with bag body) are bonded, the bag body 10 (10 Since the lower surface portion and the upper surface portion of ') are in contact, the adhesive soaks into the lower surface portion of the bag body 10 (10') and reaches the upper surface portion, and the lower surface portion of the bag body 10 (10 ') This is to prevent the upper surface portion from adhering. That is, the release paper 16 is an adhesive penetration preventing material. When a particularly strong adhesive is used, it is preferable to provide the release paper 16 inside the bag 10 (10 ').

  As another embodiment, the bag body 10 (10 ′) may be folded and adhered to the segment SE1 and covered with a protective sheet to form a bag-attached segment SE2 (or a bag-reduced segment SE3). . This aspect is convenient when injecting more backfilling material than the cylindrical bag. Moreover, it is good also as a structure which provides the release paper 16 like a 2nd embodiment.

  Although the embodiment of the bag body 10 (10 ') has been described above, the bag body 10 (10') of the present invention is not limited to the above embodiment.

Next, FIG. 6 (A) is a cross-sectional view of the main part when the tail brush 5 of the shield excavator 1 is in a position in direct contact with the outer peripheral surface of the segment.
FIG. 6B is a cross-sectional view of the main part in a state where the tail brush 5 has moved from the position of FIG. 6A to a position in contact with the surface of the protective sheet 20 attached to the outer peripheral surface of the segment.
FIG. 6 (C) shows that the tail brush 5 is in contact with the surface of the protective sheet 20 corresponding to the back-filling material injection bag 10 that is further bonded to the outer peripheral surface of the segment from the position of FIG. 6 (B). It is principal part sectional drawing of the state which moved to the position of a state.
FIG. 7D is a cross-sectional view of the main part when the tail brush 5 is in a position where it directly passes through the region of the protective sheet 20 and is in direct contact with the outer peripheral surface of the segment again.
FIG. 7E is a main part cross-sectional view showing a state in which the backfill material is injected into the bag body 10 immediately after the tail brush 5 passes through the upper surface of the protective sheet 20.

  FIG. 8 is a vector display of the force that the protective sheet 20 receives from the tail brush 5. In FIG. 8, the protective sheet 20 is a force F that is the sum of the force f1 that the tail brush 5 exerts on the protective sheet 20 and the force f2 that the tail brush exerts on the protective sheet 20 in the vertical direction as the shield excavator 1 advances. Is receiving. That is, when the tail brush 5 moves in contact with the protective sheet 20, the force (contact pressure) acting on the protective sheet 20 acts in a direction that increases the sticking of the protective sheet 20 to the outer peripheral surface of the segment. To do. In addition, the magnitude | size and direction of force F change with the speed v (advance speed of the shield excavator 1) of the tail brush 5. FIG.

When the tail brush 5 starts to pass over the upper surface of the protective sheet 20, that is, when the tail brush 5 changes from the state of FIG. 6 (A) to the state of FIG. 6 (B), the tail brush 5 is attached to the outer peripheral surface of the segment SE2 (SE3). The end portion 20 ′ of the protective sheet 20 receives the force F from the tail brush 5 as described in FIG. This force F acts to increase the sticking of the protective sheet 20 to the outer peripheral surface of the segment as described.
In addition, since the protective sheet 20 is thin (1 mm or less), there is almost no step between the surface of the segment SE2 (SE3) and the protective sheet 20, and the tail brush 5 is formed smoothly on the protective sheet 20. It moves to the end portion 20 ′. Therefore, the protective sheet 20 is not peeled off.

Then, as shown in FIG. 6C, the tail brush 5 is in contact with the surface of the protective sheet 20 corresponding to the bag body 10 (10 ′) further bonded to the outer peripheral surface of the segment. To make a smooth transition.
Thereafter, the tail brush 5 smoothly moves on the upper surface of the protective sheet 20, and as shown in FIG. 7D, the tail brush 5 passes the region where the bag body 10 (10 ′) exists, and further, The sheet 20 moves to the position of direct contact with the outer peripheral surface of the segment past the region where the sheet 20 exists.

  Immediately after the tail brush 5 passes through the protective sheet 20, a backfill material is injected into the bag body 10 (10 ′) to inflate the bag body. As ') swells, it is pulled upward, peeled off from the outer peripheral surface of segment SE2 (segment SE3), and attached to the surface of bag 10 (10') as shown in FIG. 7 (E). Become.

  Thus, the protective sheet 20 of the present invention is easily peeled off from the segment SE2 (segment SE3) as the bag 10 (10 ′) swells when the backfill material is injected into the bag 10 (10 ′). It is pasted with a degree of pasting force.

  Next, with reference to FIG. 9 to FIG. 11, the behavior of the bag body 10 (10 ′) and the protective sheet 20 from before the backfill material is injected to after it is injected will be described.

  FIG. 9 is a cross-sectional view of the bag-attached segment SE2 (or the bag-reduced diameter-reduced segment SE3) at the portion indicated by the arrow Z in FIG. 3 (C).

  10 and FIG. 11 show a segment SE2 with a bag body (or a bag body) at the same portion as the arrow Z portion of FIG. 3C when the backfill material is injected and the bag body 10 (10 ′) swells. It is sectional drawing which showed the behavior of the said bag body 10 (10 ') and the protection sheet 20 at the time of cut | disconnecting attached diameter reduction segment SE3).

  FIG. 9 shows that the bag 10 (10 ′) is firmly bonded to the outer peripheral surface of the segment using an adhesive before the backfill material is injected (first step), and the bag 10 (10 The state (2nd process) which affixed the protection sheet 20 on the segment outer peripheral surface and the said bag body 10 (10 ') so that the whole surface of') may be covered is shown.

  In the present invention, the bag 10 (10 ′) is in a state where the protective sheet 20 is firmly bonded to the outer peripheral surface of the segment SE1 at the bonding surface 15 portion, and the bag 10 (10 ′). The protective sheet 20 is affixed to the outer peripheral surface of the segment and the bag body 10 (10 ′) so as to cover the entire surface. Therefore, even when the tail brush 5 moves, the protective sheet 20 is not easily peeled off.

FIG. 10 shows a state immediately after the backfill material is injected, the bag body 10 (10 ′) is expanded, and the protective sheet 20 is peeled off from the outer peripheral surface of the segment.
When the back filling material is injected from the back filling material injection hole 11, the bag body 10 (10 ′) swells, and the protective sheet 20 is pulled upward by the force that the bag body 10 (10 ′) tries to swell. Peel from the outer peripheral surface of the segment.

  As described above, the protective sheet 20 has a force to peel off the protective sheet 20, that is, a sticking force to be easily peeled off when receiving a force for injecting the backfill material and causing the bag body 10 (10 ') to expand. It is pasted in.

  FIG. 11 shows that a predetermined amount of backfill material is injected into the bag body 10 (10 ′), and the bag-attached segment SE2 (or the bag-reduced diameter segment SE3) is the backfill material outside the shield excavator. It is shown in a sufficiently swollen state to prevent it from flowing out into or into the front of the shield excavator. At this time, in this embodiment, the protective sheet 20 is in a state of being attached to the upper portion of the bag body 10 (10 ').

The present invention will be specifically described below based on experimental examples.
[Experimental example]
An epoxy resin adhesive is applied along the outer periphery to a part of the outer periphery of the steel segment so that the hole for injecting the backfill material of the segment communicates with the hole portion of the bag body. The segment was attached to the bag by placing the bag on the part where the adhesive was applied.

  The bag body has a tensile strength of 40 to 64 N / mm in the vertical direction (upper circumferential direction), 8 to 30 N / mm in the horizontal direction (traveling direction of the shield excavator), a horizontal elongation of 70 to 150%, and a thickness of 1 mm. The material used was nylon.

  Next, the adhesive tape as the protective sheet 20 was attached so as to cover a part of the back side in the tunnel extending direction of the bag body 10 (10 ′) across the outer peripheral direction of the segment (FIG. 4C ′). ) State).

  Then, the shield excavator 1 having the tail brush 5 is advanced, and the tail brush 5 is passed over the bag body 10 (10 ′) covered with the protective sheet 20 so as to contact the protective sheet 20. . As a result, although there was a rubbing trace on the protective sheet 20 and the bag body 10 (10 '), there was no deviation and the bag body was not damaged.

  After the tail brush 5 passes through the protective sheet 20 and the bag body 10 (10 ′), it serves as a back filling material at an injection pressure of 0.1 to 0.2 MPa from a hole for injecting the back filling material provided in the segment. Mortar was poured into the bag 10 (10 ').

  At that time, the protective sheet 20 is peeled off from the bag body 10 (10 ') and remains on the segment while the bag body is inflated with the backfill material injected, and the bag body 10 (10') is ruptured. And the injected backfill material did not leak, and the test results were good enough to fill the tail void, and the experimental results were good.

  As described above, the bag according to the present invention, the segment to which the bag is attached, and the tunnel construction method using the segment can easily complete the segment with the bag at the site and damage the bag. In addition, the tunnel can be constructed while preventing the backflow material and the like from flowing out to the outside front of the shield excavator and flowing into the inside front.

DESCRIPTION OF SYMBOLS 1 Shield excavator, 2 Cutter, 3 Earth removal mechanism, 4 Shield jack, 4 'rod, 5 Tail brush, 6 Excavation part, 7 Clearance, 10, 10' Backfill material injection bag body (bag body), 11 Backfilling material injection hole, 12 holes, 13, 14 Sewing part, 15 Adhesive surface 16 Release paper, 20 Protective sheet, SE1 segment, SE2 Segment with bag for injection of backfilling material (segment with bag), SE3 Segment with bag for injection of backfill material (reduced diameter segment with bag), T tail void

JP 2002-235493 A JP-A-11-193692

Claims (6)

A backfilling material injecting construction set comprising a backfilling material injecting bag provided on an outer peripheral surface of a segment constituting the tunnel, and a set of protective sheets for protecting the backfilling material injecting bag,
The backfill material injecting bag body has an adhesive surface that can be adhered to the outer peripheral surface of the segment with an adhesive, and a hole communicating with the backfill material injecting hole provided in the segment. And
A set for backfilling material injection work, wherein the protective sheet covers the backfilling material injection bag bonded to the segment and is attached to the segment for use. A backfilling material injection bag provided on the outer peripheral surface of a segment constituting the tunnel,
The bag body has a bonding surface that can be bonded to the segment with an adhesive, and a hole that communicates with a back-filling material injection hole provided in the segment.
A bag body for injecting a backfilling material, comprising an adhesive penetration preventing material inside the bag body. The segments that make up the tunnel,
The backfilling material injecting bag according to claim 1 is adhered to the outer peripheral surface of the segment with an adhesive,
A segment, wherein the protective sheet according to claim 1 is attached to an outer peripheral surface of the segment so as to cover the bag for injecting the backfill material adhered to the segment. A segment according to claim 3,
The segment, wherein the protective sheet is attached to the segment so as to cover a part of the back side in the tunnel extending direction of the bonded backfill material injection bag body. A tunnel construction method for making a tunnel by digging a shield excavator,
A first step of adhering the backfilling material injection bag with an adhesive to the outer peripheral surface of the segment constituting the tunnel;
A second step of covering the backfill material injecting bag bonded to the outer peripheral surface of the segment and attaching a protective sheet to the outer peripheral surface of the segment;
After the tail brush provided on the tail portion of the shield excavator passes through the backfilling material injection bag covered with the protective sheet, the hole is inserted into the backfilling material injection hole provided on the segment. And a third step of peeling the protective sheet while inflating the bag body by injecting the backfill material into the hole of the bag body for injecting the backfill material that communicates with the tunnel. In the tunnel construction method according to claim 5,
The second step is a tunnel construction method characterized in that the protective sheet is attached to the segment so as to cover a part of the back side in the tunnel extending direction of the bonded backfilling material injection bag body.

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