JP4450458B2 - Covering method for inner surface of hollow structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lining how the cavity structure surface, such as a tunnel or a tube having a corner portion on the inner peripheral surface in the cross section.
[0002]
[Prior art]
When constructing a tunnel using the shield method, when constructing the primary lining by assembling an annular segment, the segment primary lining is usually used to establish the lining functions such as waterproofing, corrosion resistance, and inner surface smoothness of the tunnel wall. A so-called secondary lining is constructed by placing concrete inside the door.
[0003]
Construction of such secondary concrete lining is complicated, such as assembly of formwork, concrete placement curing, and subsequent dismantling of the formwork, and the formwork cannot be removed without waiting for the concrete to cure and cure. The construction period was inevitably long, and the burden of construction cost was great.
[0004]
In addition, concrete is poor in acid resistance, and when the constructed shield tunnel is used as a sewer for sewers, it is easily affected by the acid gas generated from the sewage, and the corrosion resistance of the secondary lining may become a problem. It was. Alternatively, due to such a problem of anticorrosion, the thickness of the concrete secondary lining has to be made relatively thick, for example, 30 to 40 cm.
[0005]
In order to solve the above-mentioned problem, recently, instead of the secondary lining by concrete placement, the secondary lining main body is assembled by adding a plastic cylindrical body, and then backfilling is performed, so that the second method is applied by the so-called pipe-in-pipe method. The next lining construction method has been proposed.
[0006]
In such a construction method, when the cross-sectional shape of the primary lining surface is circular, a strip plate body is wound to create a short cylindrical plastic cylinder, and this is used for the main body of the secondary lining. Can be used for construction. In addition, plastic lining may be applied to repair existing pipes such as sewer pipes or to prevent touch. Similarly, in this case, when the cross-sectional shape of the existing pipe is circular, the lining can be performed by adding a plastic cylindrical body.
[0007]
[Problems to be solved by the invention]
However, when the cross-sectional shape of the primary lining or existing pipe has corners such as arch type, horseshoe type or rectangle, in the connection of the cylindrical body, according to the shape of the primary lining or existing pipe, The inner surface could not be lined.
[0008]
The present invention has been made to solve such a problem, in a cavity structure having a corner portion, to provide a way capable of lining the cavity structure surface connecting the cylindrical body With the goal.
[0009]
[Means for Solving the Problems]
In the lining method of the present invention, the top surface and the side surface portion have a circular arc cross section, the bottom surface has a linear cross section, corner portions are formed at both ends of the bottom surface, and the inner surface of the cavity structure extending in a predetermined direction is formed . A lining method, wherein a plurality of cylindrical bodies made of a flexible material having a cross-sectional shape corresponding to corners of the peripheral surface of the hollow structure body are formed, and the plurality of cylindrical bodies are formed. The plurality of cylindrical bodies are arranged in the hollow structure so that the opening direction is along the extending direction of the hollow structure and the corners of the cylindrical body are matched with the corners of the hollow structure. And a step of connecting adjacent cylindrical bodies among a plurality of cylindrical bodies arranged in the hollow structure body, wherein the cylindrical body has an arcuate cross section on the upper surface and the side surface portion. None, the bottom part has a straight cross-section, and the corner located between the side part and the bottom part is formed in a cross-section arc shape. Radius of curvature at the corners of the tubular body is smaller than the radius of curvature of the upper surface and side portions, thereby achieving the above object.
[0010]
The step of forming the cylindrical body includes winding a flexible strip plate member having a predetermined length in the longitudinal direction and bending it along a weakened portion provided along the width direction of the strip plate member. it may include forming a corner of the tubular body Te.
[0011]
The strip member has a number of reinforcing ribs arranged side by side so as to extend along the longitudinal direction of the strip member, and the weakened portion extends along the width direction of the strip member. You may form by the single or several notch provided in this rib.
[0012]
The connecting portion between the adjacent cylindrical bodies may further include a step of fixing the outer peripheral surface of the cylindrical body to the inner peripheral surface of the hollow structure.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a lining method according to the present invention will be described with reference to the accompanying drawings.
[0016]
(Embodiment 1)
FIG. 1 is a diagram illustrating the carrying-in of a band plate material 10 for forming a cylindrical body and the arrangement in the primary lining of the cylindrical body formed from the band plate material 10 in the lining method of the first embodiment. . Fig.1 (a) shows the longitudinal cross-section of a primary lining, FIG.1 (b) shows the XX sectional view in Fig.1 (a).
[0017]
As shown in FIG. 1 (a), the plurality of strip plates 10 are lowered into the primary lining 1 through the vertical holes 9 while being placed on the carriage 90, and then transferred to a predetermined position in the primary lining 1. Is done. In the first embodiment, a cross section of the inner peripheral surface of the primary lining 1 has an arch shape in which the bottom of a circle is flattened as shown in FIG. Is formed. The size of the primary lining 1 usually has an inner diameter (for example, about 2 m) that allows a person to work inside.
[0018]
Next, the strip 10 carried to a predetermined position is wound and deformed into a cylindrical body 20 having a cross-sectional shape corresponding to the cross-sectional shape of the primary lining 1. The cylindrical body 20 formed in this way is arranged so that the opening direction thereof is aligned with the axial direction of the primary lining 1 (direction in which the primary lining extends).
[0019]
FIG. 2 is a perspective view of the band plate material 10. As shown in FIG. 2, the strip material 10 includes a strip-like base portion 12 extending along the longitudinal direction L, and a plurality of ribs provided on the one side surface of the base portion 12 so as to extend along the longitudinal direction L. 14. The cross-sectional shape of the rib 14 can be various forms such as a T-shape in addition to the L-shape as illustrated.
[0020]
Moreover, the convex part 16a and the recessed part 16b which can be joined by the fitting of the axial direction of the primary lining 1 are formed in the both-sides edge part of the strip | belt board material 10. FIG. The convex portion 16a has a tip portion that expands in the shape of an arrowhead, and the concave portion 16b is provided with a pair of return tooth-like locking pieces at the distal end portion, and after inserting the convex portion 16a, the arrowhead of the convex portion Engage with the tip of the tube to prevent it from coming off.
[0021]
Furthermore, the weakened part 18 extended along the width direction W is provided in the strip 10 of this embodiment in two places near the both ends of the strip 10. The weakening part 18 is comprised by one cut | notch which cut | disconnects this so that the rib 14 may be crossed and reaches the base 12, for example. Alternatively, the weakened portion 18 may have a groove shape, and can have various cutout shapes provided in the rib along the width direction of the strip material. In FIG. 2, the cut width of the weakened portion 18 is shown enlarged for easy understanding.
[0022]
The band plate material 10 thus configured is wound along the longitudinal direction so that the smooth surface is located on the inner surface side and the rib is located on the outer surface side, and both end portions 19 are heat-sealed or known joints. The cylindrical body 20 is formed by connecting metal fittings or the like to each other. When the strip 10 is wound, the weakened portion 18 facilitates bending with the concave portion on the inner surface side of this portion of the strip 10 and forms a tubular body 20 having a desired cross-sectional shape with a corner. It becomes possible to do. The ribs 14 positioned on the outer surface side of the formed cylindrical body 20 increase the strength of the cylindrical body 20 and form a predetermined space between the primary lining 1 and the base portion of the cylindrical body 20. Play a role. The cylindrical body 20 obtained in this way has shape retention and can maintain a desired shape.
[0023]
The band plate material 10 as described above is preferably formed by an extruded product made of plastic such as polyethylene, polypropylene, polyvinyl chloride or the like. However, according to the form of lining, a flexible strip material formed from various materials other than these can be used.
[0024]
Moreover, the dimension of the strip material 10 is, for example, about 50 cm in width and about 6 m in length, which is slightly smaller than the inner peripheral length of the primary lining. The thickness of the base portion 12 is, for example, about 2 mm to about 5 mm, and an appropriate strength is ensured so that the band plate material 10 does not cause troubles such as disconnection due to bending at the corner portions. The height of the rib is, for example, about 15 mm to about 50 mm.
[0025]
FIG. 3 is a view showing an arrangement in the primary lining 1 of the tubular body 20 formed from the strip plate material 10. As can be seen from the figure, the cylindrical body 20 is formed to have a corner portion 22 having a shape corresponding to the corner portion 2 on the inner peripheral surface of the primary lining 1 by bending the weakened portion 18 of the band plate material 10. The primary lining 1 is arranged so as to conform to the inner peripheral surface. That is, the cylindrical body 20 has a circular arc shape in the portion corresponding to the primary lining top surface and the side surface portion having a circular arc cross section, and the portion corresponding to the primary lining bottom surface in a straight cross section is bent at the corner portion 22. The cross section is formed in a straight line shape. In addition, the both ends 19 of the strip board material mutually connected by applying heat fusion or a well-known joint metal fitting etc. are located in the bottom face part of the primary lining 1 as mentioned above.
[0026]
FIG. 4 shows an enlarged corner 22 of the tubular body 20. As shown in FIG. 4, at the corner portion 22, the cylindrical body 20 is linearly bent into a “<” shape. Thereby, in the corner | angular part 2 of the internal peripheral surface of the primary lining 1, it is prevented that an unwanted clearance gap is formed between the outer surface of the cylindrical body 20. FIG. The shape of the inner peripheral surface of the cylindrical body 20 arranged in this way is made substantially the same shape as the inner peripheral surface of the primary lining 1.
[0027]
However, the form of the weakened portion 18 of the strip 10 provided to form the corner portion 22 of the cylindrical body 20 can be various forms. Depending on the form of the weakened portion 18, the corner portion 22 may be, for example, FIG. It can be set as various forms as shown to (a)-FIG.5 (c). In the form shown in FIGS. 5A to 5C, the corner portion 22 has a radius of curvature (that is, a radius close to the primary lining radius R1) at the upper surface and the side surface portion of the cylindrical body 20. By making the curvature radius R2 much smaller, the shape corresponding to the corner 2 of the primary lining 1 is obtained.
[0028]
FIG. 6 shows a state where a plurality of cylindrical bodies 20 are connected. After forming a plurality of cylindrical bodies 20 in the primary lining 1 as described above and arranging these opening directions along the axial direction of the primary lining 1, the adjacent cylindrical bodies 20 are Connected to each other. This connection is achieved by fitting a convex portion 16a (shown in FIG. 2) provided in one cylindrical body and a concave portion 16b (shown in FIG. 2) provided in the other cylindrical body. .
[0029]
FIG. 7 is a diagram showing an example of a connecting step of this cylindrical body. In the form shown in FIG. 7, the cylindrical body is coupled using a tension ring 40, a hydraulic cylinder 42 connected to the tension ring 40, and a hook 44 connected to the hydraulic cylinder 42 via a wire. As shown in FIG. 8, the tension ring 40 has four ring pieces 40a provided along the inner periphery of the cylindrical body 20, and an inward flange 40b formed at the end of the ring piece 40a. By screwing bolts and nuts into bolt holes (not shown) formed in the flange 40b, and adjusting the screwing degree of the bolts and nuts, each ring piece 40a covers the inner surface of the cylindrical body 20. Press and hold in place. In this way, the tension ring 40 is held at a fixed position on the inner surface of the cylindrical body 20, and the hook 44 is hooked on the end surface of the cylindrical body 20 to be connected as shown in FIG. By pulling 44 toward the tension ring 40, the cylindrical body 20 is added.
[0030]
As shown in FIGS. 3, 6, and 10, a fixing member 30 made of, for example, aluminum, iron, stainless steel, or the like is provided at a connection portion of the cylindrical body 20, so that the cylindrical body 20 is primary lining 1. You may fix with respect to the inner peripheral surface. As shown in FIG. 3, for example, the fixing member 30 is provided with an elongated member having a curved surface or a flat surface so as to conform to the shapes of the primary lining 1 and the tubular body 20, and is disposed on the entire circumference of the tubular body 20. A plurality of fixing members 30 can be attached over the whole. These fixing members 30 are further provided with fixing means to the inner surface of the primary lining 1 such as bolts, and the elongated member is connected to the outer peripheral surface of the cylindrical body 20 to prevent the movement of the cylindrical body 20. obtain. Further, as shown in FIG. 3, if the fixing member 30 is provided over substantially the entire circumference of the cylindrical body 20, the cylindrical body 20 is brought into the inner side by injection of cement milk in the backfilling process to be described later. There is also an effect of preventing the deformation. That is, it is possible to increase the strength of the cylindrical body 20 and improve its shape retention. However, the fixing member 30 may be provided only in a part of the inner periphery of the primary lining according to the direction of the external force that can be applied to the cylindrical body 20 or the like, or the length in the circumferential direction is short. The flat plate-shaped fixing member may be arranged in a dot shape along the circumferential direction.
[0031]
Such an installation method of the fixing member 30 is, for example, as follows. That is, as shown in an enlarged view in FIG. 10, one peripheral end 30a of the fixing member 30 is disposed inside the L-shaped rib 14a in the end face of the cylindrical body 20a that is already connected and installed. Next, the fixing member 30 is fixed to the inner surface of the primary lining 1 by the fixing means 32, thereby restricting the movement and deformation of the cylindrical body 20a to the inside. Next, another cylindrical body 20b to be further connected is installed. At this time, the other peripheral edge portion 30b of the fixing member 30 is disposed inside the rib 14b at the end surface portion of the other cylindrical body 20b, thereby restricting movement and deformation of the cylindrical body 20b to the inside. The The fixing member 30 provided in this way is arranged so as to straddle the connecting portions of the cylindrical bodies 20a and 20b, and prevents the cylindrical bodies from moving and deforming inside, and is caused by this movement or deformation. It also prevents disconnection of the obtained cylindrical body.
[0032]
The fixing member 30 is preferably provided at each connecting portion of the aligned cylindrical bodies 20, but may be provided for each predetermined number of cylindrical bodies. About the installation form of the fixing member 30, arbitrary appropriate forms are selected in consideration of the shape retaining property of the cylindrical body 20, work efficiency, and the like.
[0033]
Further, cement milk or the like is filled in the gap between the secondary lining constructed by connecting the cylindrical bodies in this manner (that is, the connected cylindrical bodies 20) and the inner surface of the primary lining 1. May be backfilled. In addition, when the fixing member 30 is provided as described above, it is possible to effectively suppress deformation and floating of the cylindrical body at the time of filling the backfill material. For these techniques, for example, a secondary lining construction method proposed by the present applicant (Japanese Patent Application No. 10-314391) can be used.
[0034]
As described above, according to the lining method of the present embodiment, appropriate lining can be performed even in a primary lining of a cross-sectional shape having a corner like a cylindrical body with a smooth bottom surface. .
[0035]
(Embodiment 2)
FIG. 11 shows a cross-sectional view when the tubular body 60 having a rectangular cross section formed from the strip plate material is disposed along the inner periphery of the primary lining 6 in the lining method according to the second embodiment. As shown in the figure, in this embodiment, the cross section of the primary lining 6 is substantially square, and the cross-sectional shape of the cylindrical body 60 is also configured to be substantially square.
[0036]
Also in the second embodiment, the cylindrical body 60 is formed by winding a plastic strip material having a weakened portion similar to that of the first embodiment, and connecting the end portions of the strip material to each other by heat fusion or the like. Formed by. That is, in the second embodiment, the band plate material includes four weakened portions extending in the width direction of the band plate material formed by cutting the base, ribs, and ribs, and the cross section is obtained by bending the band plate material at the weakened portions. A square cylindrical body can be formed. Similar to the first embodiment, a convex portion and a concave portion for connecting adjacent cylindrical bodies are provided on both side edge portions of the band plate material corresponding to the end face portion of the cylindrical body.
[0037]
FIG. 12 shows an enlarged view of the corner 62 of the cylindrical body 60 shown in FIG. The cylindrical body 60 is bent at a substantially right angle at the corner 62. However, the form of the weakened part of the band plate material for forming the corner part 62 can be various forms. With this form, the corner part 62 of the cylindrical body 60 is, for example, FIG. 13 (a) to FIG. It can be in various forms as shown in (c). Moreover, when the angle which the cylindrical body 60 forms in the corner | angular part 62 is comparatively small like this embodiment, a bending wrinkle may be attached to the cylindrical body in a corner | angular part. The bending wrinkle can be applied, for example, by forcibly bending the band plate material so that a bending wrinkle applying jig having a predetermined angle is applied to the corner of the inner surface of the cylindrical body. The shape retention can be further improved.
[0038]
In addition, when the degree of bending of the corner portion of the cylindrical body is relatively large, the connecting convex portion or the concave portion provided on the end surface of the cylindrical body may be considerably deformed at the corner portion, In this case, there is a possibility that the cylindrical bodies cannot be properly connected. Therefore, in such a case, the connecting projections and / or recesses may not be provided at the corners, or these may be removed during construction.
[0039]
The cylindrical body 60 formed in a rectangular shape in this way can also be connected by a method similar to the method described in the first embodiment. Moreover, you may provide the fixing member 64 (illustrated in FIG. 11) in the connection location of the cylindrical body 60 similarly to Embodiment 1. FIG. In this way, a secondary lining corresponding to the shape of the primary lining having a rectangular cross section is formed.
[0040]
Thereafter, as in the first embodiment, cement milk or the like is injected between the outer surface of the cylindrical body and the inner surface of the primary lining to perform backfilling, and the cylindrical body is fixed in the primary lining. The secondary lining thus formed may have an inner surface that is substantially the same shape as the primary lining. In addition, useless consumption of backfilling material can be suppressed.
[0041]
Note that the lining method of the present invention includes a corner from a flexible strip having a weakened portion in a hollow structure of various forms extending in a predetermined direction such as a primary lining having a corner and an existing pipe. It can utilize for the various use suitable for forming a cylindrical body and connecting these and performing a lining work. For example, the lining method of the present invention may be used to perform lining by connecting tubular bodies inside a hollow structure such as an existing pipe having a corner on the inner peripheral surface. In this case, the hollow structure such as an existing pipe may be made of various materials such as concrete, metal, and plastic.
[0042]
【The invention's effect】
According to lining how the present invention, the cavity structure having a corner portion in a cross section, to form a plurality of lining tubular body having a matching corner in the corner portion, and connecting the cylindrical body Therefore, the lining work can be performed easily and quickly.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining the introduction of a band plate material and the arrangement of cylindrical bodies in the lining method according to the first embodiment. Fig.1 (a) is a longitudinal cross-sectional view of a primary lining, and FIG.1 (b) is sectional drawing along the XX line in Fig.1 (a).
FIG. 2 is a perspective view of a strip material used in the lining method of the first embodiment.
FIG. 3 is a cross-sectional view when a cylindrical body is disposed in the primary lining in the lining method of the first embodiment.
4 is a partially enlarged view showing an enlarged corner of a cylindrical body in the cross-sectional view of FIG. 3; FIG.
5 is a partially enlarged view of a corner portion of a tubular body having a form different from the form shown in FIG. 4, and FIGS. 5 (a) to 5 (c) are corner portions having different forms, respectively. Indicates.
FIG. 6 is a cross-sectional view of the primary lining in a state where the cylindrical bodies are connected inside the primary lining in the lining method of the first embodiment.
7 is a cross-sectional view of a primary lining showing a step of connecting cylindrical bodies in the lining method of Embodiment 1. FIG.
FIG. 8 is a cross-sectional view of the tension ring shown in FIG.
FIG. 9 is a partially enlarged view showing a joint portion between the hook and the cylindrical body shown in FIG. 7 in an enlarged manner.
FIG. 10 is a partially enlarged view showing the connecting portion of the cylindrical body shown in FIG. 6 in an enlarged manner.
FIG. 11 is a cross-sectional view when a cylindrical body is arranged in a primary lining in the lining method of Embodiment 2.
12 is a partially enlarged view showing an enlarged corner of a cylindrical body in the cross-sectional view of FIG. 11. FIG.
13 is a partially enlarged view of a corner portion of a tubular body having a form different from that shown in FIG. 12, and FIGS. 13 (a) to 13 (c) are corner parts of different forms, respectively. Indicates.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Primary lining 2 Corner | angular part 10 of primary lining Strip material 12 Base 14 Rib 16a Connection convex part 16b Connection concave part 18 Weak part 19 Both ends 20 Cylindrical body 22 Corner 30 of cylindrical body Fixing member

Claims (5)

The upper surface and the side surface portion are arc-shaped in cross section, the bottom surface is linear in cross section, corners are formed at both ends of the bottom surface, and a covering method for the inner surface of the cavity structure extending in a predetermined direction,
A plurality of cylindrical bodies made of a flexible material having a cross-sectional shape corresponding to corners of the peripheral surface of the hollow structure body are formed, and the opening direction of the plurality of cylindrical bodies is the hollow structure body Arranging the plurality of cylindrical bodies in the hollow structure so that the corners of the cylindrical body are aligned with the corners of the hollow structure along the extending direction of
And connecting the adjacent cylindrical bodies among the plurality of cylindrical bodies arranged in the hollow structure ,
In the cylindrical body, the upper surface and the side surface portion have a circular arc shape in cross section, the bottom surface portion has a linear cross section, and the corner portion positioned between the side surface portion and the bottom surface portion is formed in a circular arc shape in cross section
A lining method characterized in that a radius of curvature at a corner of the cylindrical body is made smaller than a radius of curvature at an upper surface and a side surface . The step of forming the cylindrical body includes winding a flexible strip plate member having a predetermined length in the longitudinal direction and bending it along a weakened portion provided along the width direction of the strip plate member. The lining method according to claim 1, further comprising a step of forming a corner of the cylindrical body. The strip member has a number of reinforcing ribs arranged side by side so as to extend along the longitudinal direction of the strip member, and the weakened portion extends along the width direction of the strip member. The lining method according to claim 2, wherein the lining method is formed by a single notch provided in the rib. The strip member has a number of reinforcing ribs arranged side by side so as to extend along the longitudinal direction of the strip member, and the weakened portion extends along the width direction of the strip member. The lining method according to claim 2, wherein the lining method is formed by a plurality of notches provided in the rib. 5. The method according to claim 1 , further comprising a step of fixing an outer peripheral surface of the cylindrical body with respect to an inner peripheral surface of the hollow structure body at the connecting portion of the adjacent cylindrical bodies. The lining method described in 1.

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