JP6371556B2 - Placing trace pattern elimination apparatus and casting trace pattern elimination method in tunnel lining - Google Patents

Description

  The present invention relates to a placement trace pattern eliminating apparatus and a placement trace pattern elimination method in tunnel lining, and more specifically, a placement trace pattern that appears on the surface of the lining concrete after placing the lining concrete ( The present invention relates to an apparatus and a method for eliminating uneven color of a mustache pattern.

The concrete placement order for forming the tunnel lining is generally performed in the order of the side wall, the arch, and the crown (top). In placing such lining concrete, concrete is placed using a suction hose at the side wall portion, and concrete is placed from a placement opening provided at the arch shoulder portion at the arch portion. At this time, the concrete is allowed to flow down to the lower side of the placing port, and the concrete is continuously pressed into the upper side of the placing port, and the concrete is placed to the vicinity of the top end. Subsequently, a method is adopted in which concrete is press-fitted by switching the placement port to the crown portion (top end).

  However, it is known that when traces of concrete are allowed to flow downward from the placement port, placement trace patterns (uneven color of the beard pattern) remain. Conventionally, when concrete laying is used to cast tunnel lining, the concrete is cast along the tunnel lining formwork, so it is acceptable for the trace pattern (uneven color of the mustache pattern) to occur. I had to do it.

  The cause of the cast trace pattern (uneven color of the mustache pattern) is not clear, but the cast concrete will flow down the surface of the tunnel lining formwork continuously, so it is thought that traces of the flow will remain. . Moreover, it is also considered that the variation in cement amount on the surface of the tunnel lining form, the blending of concrete, the method of applying the release agent, the abrasion of the surface of the tunnel lining form, and the like. It is known that there are variations in the placement trace pattern (uneven color of beard pattern), and the small trace tunnel is more prominent than the large cross-section tunnel. It has been.

  2. Description of the Related Art Conventionally, a technique has been disclosed that does not leave a pipe trace in tunnel lining (see, for example, Patent Document 1). The technique described in Patent Document 1 relates to a method for forming a lining that does not leave a trace of a pipe and a tunnel lining formwork apparatus used therefor. This tunnel lining formwork apparatus is a tunnel lining formwork for forming a concrete placement space between a tunnel wall surface and a top portion of a concrete placed in a concrete placement space. A tunnel lining mold provided with a supply port, and a pipe disposed near the end of the tunnel lining mold and attached upward at the top of the tunnel lining mold And at least one pipe that can be raised and lowered along its axis, and at least one vibrator that is attached to the tunnel lining formwork and is close to the pipe and that can be raised and lowered along the axis. ing.

  And during or prior to placing concrete in the concrete placement space, the pipe is raised until it abuts or approaches the tunnel wall surface, and after the concrete reaches the top of the tunnel wall surface, the pipe is lowered, By operating the vibrator while the pipe is descending, no trace of the pipe is left behind.

JP 2007-291791 A

  As described above, when the tunnel lining is constructed, a placement trace pattern (uneven color of the mustache pattern) is generated. Therefore, when this uneven color is remarkable, the tunnel lining does not look good. was there. In addition, if there is a trace pattern of the placement (uneven color of the mustache pattern), it may be indistinguishable from the uneven color due to water leakage at first glance, which may hinder the management after the tunnel is used.

  Therefore, it has been desired to develop a technique capable of eliminating such a placement trace pattern (color unevenness of a beard pattern). In this regard, the technique described in Patent Document 1 described above is a technique that does not leave a trace of the pipe in the tunnel lining, and this is used to eliminate the trace pattern of casting (uneven color of the mustache pattern). It cannot be applied.

  The present invention has been proposed in view of the above-described circumstances, and has been proposed to prevent a tunnel trace pattern (uneven color of a mustache pattern) from being generated when concrete is placed under natural flow in tunnel lining. It is an object of the present invention to provide a placement trace pattern eliminating apparatus and a placement trace pattern elimination method in construction.

  The placement trace pattern eliminating device and the placement trace pattern elimination method in the tunnel lining of the present invention have the following characteristics in order to achieve the above-described object. That is, the placement trace pattern elimination device and the placement trace pattern elimination method in the tunnel lining of the present invention are an apparatus for eliminating the placement trace pattern appearing on the surface of the lining concrete when forming the tunnel lining. And the method, and has the following configuration.

The placement trace pattern elimination device in the tunnel lining of the present invention includes a chute insertion / removal window that can be opened and closed by a lid member provided in the vicinity of a placement opening provided in a shoulder portion of a tunnel lining formwork. The flexible sheet member that hangs downward from the lower side of the chute insertion / removal window along the inner surface of the tunnel lining form, and the inner side of the tunnel lining form of the chute insertion / removal window, A pair of concrete guide walls that can be taken out from the chute insertion / removal window to the outside of the tunnel lining formwork after completion of the concrete placement , and are formed in a flat plate shape extending upward from the left and right sides thereof. And a chute having a portion .

Moreover, it is preferable that the space | interval of a pair of concrete induction | guidance | derivation wall part is reducing gradually toward the lower part of the tunnel lining formwork. Furthermore, it is preferable that the concrete guide wall portion has a height in the vertical direction with respect to the chute that increases toward the lower portion of the tunnel lining formwork.

In the tunnel lining method according to the present invention, the placement trace pattern elimination method includes a chute insertion / removal window that can be opened and closed by a lid member provided in the vicinity of a placement opening provided in a shoulder portion of a tunnel lining formwork. Opening the sheet member having flexibility downward from the lower side of the chute insertion / removal window along the inner surface of the tunnel lining form, and forming a flat plate shape upward from the left and right sides thereof The step of covering the inner surface side of the tunnel lining formwork of the chute insertion / extraction window with a chute having a pair of concrete guide wall portions provided extending toward the surface, and the sheet member in accordance with the placement height of the concrete The step of pulling up, the step of taking out the chute from the chute insertion / removal window to the outside of the tunnel lining formwork after the concrete placement from the shoulder, and the chute insertion / removal window are closed by the lid member, above the shoulder Hekonkuri It is characterized in that a step of pouring the door.

  Moreover, in addition to the process mentioned above, in order to place concrete upward from the shoulder portion, it is possible to press-fit the concrete from a placement opening provided in the shoulder portion.

  According to the placement trace pattern eliminating apparatus and the placement trace pattern elimination method in the tunnel lining of the present invention, when concrete is placed by natural flow from the placement opening provided in the shoulder of the tunnel lining formwork. In addition, a chute insertion / removal window is provided below the placement opening, and a flexible sheet member is hung from the lower side of the chute insertion / removal window downward along the inner surface of the tunnel lining formwork. As a result, the concrete that flows down naturally flows down the surface of the sheet member without directly contacting the surface of the tunnel lining formwork, thereby preventing the occurrence of placement trace patterns (uneven color of the mustache pattern). can do.

  Moreover, by covering the inner surface side of the tunnel lining formwork of the chute insertion / removal window with the chute, the concrete can be efficiently placed without leaking the concrete from the chute insertion / removal window.

  In addition, the placement trace pattern (uneven color of the mustache pattern) is generated by the natural flow of the concrete to be placed. Therefore, when placing concrete from the shoulder, the concrete is introduced from the placement opening provided in the shoulder. By press-fitting, there is no natural flow of concrete, and it is possible to prevent the occurrence of a placement trace pattern (uneven color of the beard pattern) even above the shoulder.

The cross-sectional schematic diagram of the placement trace pattern elimination apparatus in the tunnel lining which concerns on embodiment of this invention. The top view (a) and sectional drawing (b) of the chute | shoot which concern on Example 1 of this invention. The perspective view of the chute | shoot which concerns on Example 2 of this invention. The top view (a) and sectional drawing (b) of the protection board material which concern on embodiment of this invention. Explanatory drawing (1) which shows the placement procedure of the concrete in the placement trace pattern removal method which concerns on embodiment of this invention. Explanatory drawing (2) which shows the placement procedure of the concrete in the placement trace pattern removal method which concerns on embodiment of this invention. Explanatory drawing (3) which shows the placement procedure of the concrete in the placement trace pattern removal method which concerns on embodiment of this invention. Explanatory drawing (4) which shows the placement procedure of the concrete in the placement trace pattern removal method which concerns on embodiment of this invention. Explanatory drawing (5) which shows the placement procedure of the concrete in the placement trace pattern removal method which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 9 explain a placement trace pattern eliminating apparatus and a placement trace pattern elimination method in tunnel lining according to an embodiment of the present invention, and FIG. 1 is a schematic cross-sectional view of the placement trace pattern elimination apparatus, 2 is a plan view and a cross-sectional view of the chute according to the first embodiment, FIG. 3 is a perspective view of the chute according to the second embodiment, FIG. 4 is a plan view and a cross-sectional view of the protective plate, and FIGS. It is explanatory drawing which shows the placement procedure of the concrete in a pattern elimination method.

<Outline of placement trace pattern elimination device and placement trace pattern elimination method>
The placement trace pattern elimination apparatus and the placement trace pattern elimination method according to the embodiment of the present invention are an apparatus and a method for eliminating a placement trace pattern that appears on the surface of lining concrete when forming a tunnel lining. It is about.

  As shown in FIG. 1, the placement trace pattern eliminating apparatus includes a chute insertion / removal window 10, a sheet member 20, and a chute 30 as main components. The chute insertion / removal window 10 is a window for inserting / removing the chute 30, which is provided in the vicinity of the placement port 50 provided in the shoulder portion of the tunnel lining form 40, and is opened and closed by the lid member 11. It is possible. By dropping the sheet member 20 downward along the inner surface of the tunnel lining formwork 40 from the chute insertion / removal window 10, the concrete 60 to be cast from the placement port 50 is transferred to the inner surface of the tunnel lining formwork 40. Avoid direct contact. At this time, the chute 30 covers the inner surface side of the tunnel lining form 40 of the chute insertion / removal window 10 so that the concrete 60 does not leak from the chute insertion / removal window 10.

<Form for tunnel lining>
The placement trace pattern elimination apparatus and the placement trace pattern elimination method according to the embodiment of the present invention are, for example, techniques applied when constructing a tunnel lining using a conventionally used formwork apparatus. is there. Although not shown, this formwork apparatus is an apparatus called a centle (slide form), and has an arcuate shape that matches the inner wall surface of the tunnel and is movable in the tunnel extension direction. I have. This formwork apparatus is provided with a carriage placed on a pair of rails, a tunnel lining formwork 40 corresponding to the inner cross-sectional shape of the tunnel, a filling material filling apparatus (for example, a pressure pump), and the like. ing.

<Chute insertion / removal window>
As shown in FIG. 1, the chute insertion / removal window 10 is a window portion provided close to the lower side of the placement opening 50 provided in the shoulder portion of the tunnel lining form 40 and can be opened and closed by the lid member 11. It has become. That is, when the concrete 60 is placed from the placement opening 50 provided in the shoulder portion of the tunnel covering formwork 40, the chute insertion / removal window 10 is opened, and the tunnel covering is performed from the lower side of the chute insertion / removal window 10. The sheet member 20 is hung downward along the inner surface of the formwork 40 and the sheet member 20 is pulled up according to the placement height of the concrete 60.

  In the state where the chute insertion / removal window 10 is opened, the chute 30 is inserted from the chute insertion / removal window 10 to the inner surface side of the tunnel lining mold 40, and the tunnel lining mold 40 is used by the chute 30. Cover the inner side of the. On the other hand, after the placement of the concrete 60 from the placement opening 50 provided in the shoulder portion of the tunnel lining form 40 is finished, the chute insertion / removal window 10 is closed by the lid member 11, and the concrete is placed near the top. 60 is laid. The chute insertion / removal window 10 can also be used as an insertion port for a rod-like vibrator (not shown) for compacting the placed concrete 60.

<Cover member>
As shown in FIG. 1, the lid member 11 is a member for opening and closing the chute insertion / removal window 10. In the tunnel covering formwork 40, one side (for example, the lower side) of the chute insertion / removal window 10 is a rotation axis. As a plate-like member that can rotate toward the inside (downward) of the tunnel. The lid member 11 is bent in conformity with the inner shape of the tunnel lining form 40 and is integrated with the tunnel lining form 40 in the closed state.

<Sheet material>
As shown in FIG. 1, the sheet member 20 is a flexible member that hangs downward from the lower side of the chute insertion / removal window 10 along the inner surface of the tunnel lining mold 40, and is used for tunnel lining. It is wound around a winding device 70 provided inside the tunnel of the mold 40. When the concrete 60 is placed from the placement opening 50 provided in the shoulder portion of the tunnel lining form 40, the sheet is formed to a predetermined depth (for example, about 3 m from the lower side of the chute insertion / removal window 10). The member 20 is dropped to cover the inner surface of the tunnel lining form 40 and the sheet member 20 is taken up by the take-up device 70 in accordance with the placement height of the concrete 60, thereby placing the member 20 from the placement port 50. The concrete 60 to be prevented from directly contacting the inner surface of the tunnel lining formwork 40 is prevented.

  The sheet member 20 may be any member as long as it is a flexible member. For example, a synthetic resin sheet or a non-woven fabric can be used. Further, the sheet member 20 can be used repeatedly unless it is torn or damaged. In this case, according to the placement height of the concrete 60, after winding with the winding device 70, it may be pulled out again and used. When the sheet member 20 is repeatedly used and deteriorated, the deteriorated portion may be cut off and an unused portion may be pulled out from the winding device 70 and used.

  In the present embodiment, for example, when the lateral width of the chute insertion / removal window 10 is about 65 cm, the lateral width of the sheet member 20 is about 64 cm, which is smaller than the width of the chute insertion / removal window 10. Moreover, the thickness of the sheet member 20 is about 0.8 mm, for example.

<Winding device>
Although not shown, the winding device 70 is preferably provided with a watering device and a scraper for removing the concrete 60 adhering to the sheet member 20 when the sheet member 20 is wound up as an auxiliary device. Further, it is preferable that the watering device and the scraper are respectively provided on both the front and back surfaces of the sheet member 20. By providing this watering device and scraper, the concrete adhering to the used sheet member 20 is removed, so that the sheet member 20 can be reused in a clean state.

<Shoot>
The chute 30 covers the inner surface side of the tunnel lining mold 40 of the chute insertion / removal window 10 and can be taken out from the chute insertion / removal window 10 to the outside of the tunnel lining mold 40 after the concrete placement. It consists of a shaped member. Here, the flat plate shape does not necessarily need to be a flat plate shape, and means that it may be bent in conformity with the inner surface shape of the tunnel lining mold 40.

<Example 1 / shoot>
As shown in FIG. 2, the chute 30 according to the first embodiment has a rotating shaft 31 provided so as to be positioned at the center in the width direction of the chute insertion / removal window 10. A pair of bent plate members 32 that are rotatable to the inner surface side (tunnel ground side) are provided. In addition, a concrete guide wall 34 extending upward is provided on each side piece of the bent plate 32.

  Then, after being inserted from the chute insertion / removal window 10 to the inner surface side of the tunnel covering formwork 40 in a state where the pair of bent plate members 32 are rotated so that the rotation shaft 31 is the rotation center, the rotation shaft By rotating the pair of bent plate members 32 so as to have a flat plate shape with 31 as a rotation center, the inner surface side of the tunnel covering formwork 40 of the chute insertion / removal window 10 can be covered by the chute 30. On the other hand, the chute 30 can be taken out from the chute insertion / removal window 10 by rotating the pair of bent plate members 32 so as to be close to each other with the rotation shaft 31 as the rotation center.

<Example 2 / shoot>
As shown in FIG. 3, the chute 30 according to the second embodiment includes a bottom plate 33 and a pair of concrete guide wall portions 34 provided to extend upward from the left and right side portions of the bottom plate 33. Further, the distance between the pair of concrete guide wall portions 34 is gradually reduced toward the lower portion of the tunnel lining mold 40. Further, the height of the concrete guide wall 34 in the vertical direction with respect to the chute 30 increases toward the lower part of the tunnel lining form 40.

  That is, the chute 30 according to the second embodiment is provided with a pair of concrete guide wall portions 34 in order to prevent the concrete 60 to be placed from spreading sideways and coming off from the upper surface of the sheet member 20. It is. Further, in order to reliably prevent the concrete 60 to be placed from spreading sideways, the distance between the pair of concrete guide wall portions 34 is gradually reduced toward the lower portion of the tunnel lining formwork 40. The height in the vertical direction with respect to the chute 30 is increased toward the lower part of the tunnel lining mold 40. Further, the width of the chute 30 according to the second embodiment is about 1 cm smaller than the width of the chute insertion / removal window 10. As a result, the chute 30 can be inserted into or removed from the inner surface of the tunnel lining form 40 from the chute insertion / removal window 10.

<Protective plate>
Due to the structure of the tunnel lining form 40, it is difficult to connect the placement port 50 provided on the shoulder and the chute insertion / removal window 10 to each other. There must be an interval between them. For this reason, in this embodiment, as shown in FIG. 1, a protective plate 80 is attached between the placement port 50 and the chute insertion / removal window 10, that is, between the placement port 50 and the chute 30. . With this protective plate member 80, the concrete 60 to be placed between the placement opening 50 and the chute insertion / removal window 10 is brought into contact with the inner surface of the tunnel lining form 40, without causing the chute 30 and the sheet member 20 to move. The upper surface can flow down.

  As shown in FIG. 4, the protective plate member 80 is made of a flat plate member, and a pair of handles 81 are attached to facilitate handling. The material of the protection plate material 80 may be any material, but for example, an iron plate is used in consideration of ease of processing, strength, and the like.

<Elimination of placement traces associated with concrete placement>
Next, with reference to FIG. 5 to FIG. 9, a procedure for eliminating a placement trace pattern associated with concrete placement will be described.

  In the placement trace pattern elimination method of the present embodiment, as shown in FIG. 5, the lid member 11 is opened / closed by a lid member 11 provided in the vicinity of the placement port 50 provided in the shoulder portion of the tunnel lining formwork 40. The possible chute insertion / removal window 10 is opened, and the flexible sheet member 20 is hung downward along the inner surface of the tunnel lining form 40 from the lower side of the chute insertion / removal window 10. The sheet member 20 can be fed and wound by the winding device 70.

  Then, the inner surface side of the tunnel lining form 40 of the chute insertion / extraction window 10 is covered with the flat chute 30. In this state, as shown in FIGS. 6 to 8, the concrete 60 is placed from the shoulder while the sheet member 20 is pulled up in accordance with the placement height of the concrete 60. Then, as shown in FIG. 9, when the placement of the concrete 60 from the shoulder is completed, the chute 30 is taken out from the chute insertion / extraction window 10 to the outside of the tunnel lining form 40.

  Thereafter, the chute insertion / removal window 10 is closed by the lid member 11 and the concrete 60 is placed above the shoulder. At this time, it is preferable to press-fit the concrete 60 from the placement port 50 provided in the shoulder. When the concrete 60 is placed from the placement opening provided near the top, although the scale is small compared to the shoulder portion, a placement trace pattern may be generated, but the placement opening provided in the shoulder portion. When the concrete 60 is press-fitted from 50, the concrete 60 does not flow down, and therefore the possibility that a placement trace pattern is generated becomes extremely low.

DESCRIPTION OF SYMBOLS 10 Chute insertion / removal window 11 Lid member 20 Sheet member 30 Chute 31 Rotating shaft 32 Bending plate material 33 Bottom plate 34 Concrete guide wall part 40 Tunnel covering formwork 50 Placing port 60 Concrete 70 Winding device 80 Protective plate material 81 Handle

Claims (5)

When forming a tunnel lining, it is a device for eliminating the placement trace pattern that appears on the surface of the lining concrete,
A chute insertion / removal window that can be opened and closed by a lid member, provided close to the bottom of the casting opening provided in the shoulder of the tunnel lining formwork,
A flexible sheet member that hangs downward from the lower side of the chute insertion / removal window along the inner surface of the tunnel lining formwork,
Covering the inner surface side of the tunnel lining form of the chute insertion / removal window , and can be taken out from the chute insertion / removal window to the outside of the tunnel lining form after completion of the concrete placement , and has a flat plate shape. A chute having a pair of concrete guide wall portions provided extending upward from the left and right sides thereof ;
A placement trace pattern eliminating device for tunnel lining characterized by comprising: 2. The placement trace pattern elimination in tunnel lining according to claim 1 , wherein a distance between the pair of concrete guide wall portions is gradually reduced toward a lower portion of the tunnel lining formwork. apparatus. It said concrete guide wall portion, the vertical height relative to the chute, the tunnel lining according to claim 1 or 2, characterized in that it increases toward the bottom of the tunnel lining for formwork Placing trace pattern elimination device. When forming a tunnel lining, it is a method for eliminating the placement trace pattern that appears on the surface of the lining concrete,
Open the chute insertion / removal window that can be opened and closed by the lid member, which is provided close to the lower side of the casting opening provided on the shoulder of the tunnel lining formwork, and tunnel lining from the lower side of the chute insertion / removal window A sheet member having flexibility is hung downward along the inner surface of the mold,
Covering the inner surface side of the tunnel lining formwork of the chute insertion / extraction window with a chute having a pair of concrete guide wall portions provided extending upward from the left and right side portions in a flat plate shape ,
In accordance with the concrete placement height, pull up the sheet member,
After finishing the concrete placement from the shoulder, the chute is taken out from the chute insertion / extraction window to the outside of the tunnel lining formwork,
Closing the chute insertion / removal window with the lid member and placing concrete above the shoulder,
A method for eliminating traces of placement in tunnel lining characterized by this. To place concrete above the shoulder, press-fit the concrete from a placement opening provided in the shoulder,
The placement trace pattern eliminating method in the tunnel lining according to claim 4 .

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