Installation jig and construction method

Abstract

To provide a retraction jig that can prevent the transmission part from falling out of the main body. [Solution] A pull-in jig 100 for pulling a rehabilitation member (rehabilitation pipe 2 and protective sheet 3) used in a pipeline rehabilitation method into an existing pipe 1 comprises a main body 110 having a first cylindrical part 111 having a first inner diameter, a second cylindrical part 112 having a second inner diameter smaller than the first inner diameter, and a connecting cylindrical part 113 connecting the first cylindrical part 111 and the second cylindrical part 112, and an inner member 120 having an outer diameter smaller than the first inner diameter and larger than the second inner diameter, and having a first engaging part 121 that can engage with the inner circumferential surface of the main body 110, and a transmission part 122 that transmits the force for pulling in the rehabilitation member.

Description

Technical Field

[0005] ,

[0004] , , ,

[0001] The present invention relates to a pulling jig for pulling a rehabilitation member used in a pipeline rehabilitation method into an existing pipe, and a construction method for pulling the rehabilitation member into the existing pipe using the pulling jig.

Background Art

[0002] Conventionally, the technology of a pulling jig for pulling a rehabilitation member used in a pipeline rehabilitation method into an existing pipe is known. For example, it is as described in Patent Document 1.

[0003] Patent Document 1 describes a pulling jig (conductive pipe, leading head) for pulling a rehabilitation member (for example, a protective sheet or a pipeline member) used in a pipeline rehabilitation method into an existing pipe. The pulling jig described in Patent Document 1 includes, for example, a main body formed in a cylindrical shape and an eyebolt (transmission part) fastened to the end face of the main body.

[0004] When using the pulling jig described in Patent Document 1 to pull a protective sheet into an existing pipe, the protective sheet is arranged so as to cover the outer surface of the main body of the pulling jig, and the protective sheet is fixed to the main body of the pulling jig. Further, a towing wire is connected to the eyebolt of the pulling jig. By pulling the towing wire with a winch and pulling the pulling jig from one end side to the other end side of the existing pipe, the protective sheet can be pulled into and arranged in the existing pipe. Further, after the protective sheet is arranged in the existing pipe, a pipeline member (rehabilitation pipe) can be fixed to the pulling jig and the towing wire can be pulled to arrange the rehabilitation pipe in the existing pipe.

[0005] However, when pulling a rehabilitation member into an existing pipe over a long distance, pulling a rehabilitation member into a large-diameter existing pipe, or pulling a rehabilitation member into a bent existing pipe, the load required to pull the pull-in jig into the existing pipe (pulling load) may increase. In such cases, the fixing part between the body of the pull-in jig and the eyebolt may not be able to withstand the pulling load, and the eyebolt (transmission part) may fall out of the body. For this reason, there is a need for a pull-in jig that can prevent the transmission part to which the towing wire is connected from falling out of the body. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-251591 [Overview of the project] [Problems that the invention aims to solve]

[0007] One aspect of this disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a pull-in jig and a construction method that can prevent the transmission part from falling out of the main body. [Means for solving the problem]

[0008] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0009] That is, a pull-in jig according to one aspect of the present disclosure is a pull-in jig for pulling a rehabilitation member used in a pipeline rehabilitation method into an existing pipe, comprising: a main body having a first cylindrical part having a first inner diameter, a second cylindrical part having a second inner diameter smaller than the first inner diameter, and a connecting cylindrical part connecting the first cylindrical part and the second cylindrical part; and an inner member having a first engaging part having an outer diameter smaller than the first inner diameter and larger than the second inner diameter, and capable of engaging with the inner circumferential surface of the main body, and a transmitting part through which force for pulling in the rehabilitation member is transmitted.

[0010] Furthermore, a retraction jig according to one aspect of the present disclosure further comprises a reinforcing portion that reinforces the second cylindrical portion.

[0011] Furthermore, in one aspect of this disclosure, the reinforcing portion is formed to surround the second cylindrical portion from the outer periphery.

[0012] Furthermore, a retraction jig according to one aspect of the present disclosure further comprises a restricting portion that restricts the movement of the reinforcing portion along the axial direction of the second cylindrical portion.

[0013] Furthermore, the regulatory portion according to one aspect of this disclosure is formed integrally with the main body portion.

[0014] Furthermore, a retraction jig according to one aspect of the present disclosure further comprises a second engaging portion that engages with the main body portion to restrict the movement of the inner member toward the first cylindrical portion relative to the main body portion.

[0015] Furthermore, the second engaging portion according to one aspect of the present disclosure is fixed to the inner member, has an outer diameter larger than the inner diameter of the second cylindrical portion, and is arranged to face the end face of the second cylindrical portion.

[0016] Furthermore, a construction method according to one aspect of the present disclosure is a construction method for pulling the rehabilitation member into the existing pipe using the pull-in jig, comprising: a fixing step of wrapping and fixing the sheet-shaped rehabilitation member around the pull-in jig; and a pull-in step after the fixing step of pulling the pull-in jig to pull the rehabilitation member into the existing pipe, wherein in the fixing step, one longitudinal end of the rehabilitation member is folded back to the first surface side of the rehabilitation member to form a folded portion, and the folded portion is wrapped around the pull-in jig such that the second surface of the rehabilitation member opposite to the first surface is located on the inside. [Effects of the Invention]

[0017] According to one aspect of the present disclosure, it is possible to prevent the transmission part from falling off from the main body part.

Brief Description of the Drawings

[0018] [Figure 1] Schematic side cross-sectional view showing the state where the protective sheet is drawn into the existing pipe. [Figure 2] Schematic side cross-sectional view showing the state where the rehabilitation pipe is drawn into the existing pipe. [Figure 3] (a) Side view showing the configuration of the drawing jig according to the first embodiment. (b) Plan view showing the configuration of the drawing jig. [Figure 4] Side cross-sectional view showing the configuration of the drawing jig. [Figure 5] Cross-sectional view taken along line A - A. [Figure 6] (a) Side view showing the state of forming a folding part on the protective sheet. (b) Perspective view showing the state of folding the protective sheet inward in the width direction. (c) Perspective view showing the state of winding the protective sheet around the drawing jig. [Figure 7] Side cross-sectional view showing the configuration of the drawing jig according to the second embodiment.

Modes for Carrying Out the Invention

[0019] Hereinafter, the directions indicated by the arrows U, D, F, B, L, and R in the drawings will be defined as the upward, downward, forward, backward, leftward, and rightward directions, respectively, for the description.

[0020] The pipeline rehabilitation method according to the present embodiment rehabilitates the existing pipe 1 by drawing and arranging the rehabilitation pipe 2 into the existing pipe 1. In the pipeline rehabilitation method according to the present embodiment, before drawing the rehabilitation pipe 2 into the existing pipe 1, the protective sheet 3 is arranged along the inner peripheral surface of the existing pipe 1. By arranging the protective sheet 3 in the existing pipe 1, when drawing the rehabilitation pipe 2 into the existing pipe 1, it is possible to prevent the rehabilitation pipe 2 from being damaged and reduce the resistance when drawing the rehabilitation pipe 2.

[0021] The following outlines the pipeline rehabilitation method (construction method) using the pull-in jig 100, using Figures 1 and 2. The specific configuration of the pull-in jig 100 will be described later.

[0022] When rehabilitating an existing pipe 1, first, the ground near both ends of the section where the rehabilitation pipe 2 will be laid is excavated to form a launching shaft 4 and a receiving shaft 5. This opens both ends of the existing pipe 1 to be rehabilitated within the launching shaft 4 and the receiving shaft 5, respectively. After that, the inside of the existing pipe 1, with both ends opened, is cleaned.

[0023] Next, as shown in Figure 1, a protective sheet 3 is laid inside the existing pipe 1 using a pull-in jig 100. Specifically, at the launch shaft 4, the end of the protective sheet 3 is pulled out from a roll 3a on which the strip-shaped protective sheet 3 is wound. The end of the protective sheet 3 is wrapped around the outer circumference of the pull-in jig 100 and secured. The specific method for securing the protective sheet 3 to the pull-in jig 100 will be described later. By wrapping the end of the protective sheet 3 around the outer circumference of the pull-in jig 100 in this way, the end of the protective sheet 3 is formed into a cylindrical shape. In addition, a towing wire 7 connected to a winch 6 located on the receiving shaft 5 side is inserted into the existing pipe 1 from the receiving shaft 5 side. The tip of the towing wire 7 is secured to the tip of the pull-in jig 100 at the launch shaft 4.

[0024] In this state, the towing wire 7 is wound up using the winch 6 and the pull-in jig 100 is pulled, causing the pull-in jig 100 to be pulled into the existing pipe 1 from the launch shaft 4 side. Along with this, the protective sheet 3 is also pulled into the existing pipe 1. At this time, in order to maintain the cylindrical shape of the protective sheet 3, tape may be attached to the protective sheet 3 at predetermined intervals while pulling the protective sheet 3 into the existing pipe 1.

[0025] After the pull-in jig 100 reaches the arrival shaft 5, the protective sheet 3 is fixed to both sides of the existing pipe 1 (the launch shaft 4 and the arrival shaft 5). In this way, the protective sheet 3 is positioned around the inner circumference of the existing pipe 1.

[0026] The protective sheet 3 can be made of any material, such as polyethylene, polypropylene, or other synthetic resins. Furthermore, a lubricant may be pre-applied to the inner surface of the protective sheet 3 (the surface facing the radially inward direction of the existing pipe 1). This reduces frictional resistance when pulling the rehabilitated pipe 2 into the existing pipe 1, improving work efficiency. Various additives can be used as lubricants, including silicone-based, talc-based (powder), poly-based, and oils. The lubricant may be pre-applied to the inner surface of the protective sheet 3, or it may be applied when pulling the protective sheet 3 into the existing pipe 1.

[0027] Next, as shown in Figure 2, the rehabilitated pipe 2 is laid inside the existing pipe 1 using the pull-in jig 100. Specifically, in the launch shaft 4, the rehabilitated pipe 2 (more specifically, the pipeline members 2a, which are the rehabilitated pipe 2 divided into multiple sections) is fixed to the rear end of the pull-in jig 100. The pipeline members 2a are fixed to the pull-in jig 100 by butt fusion using a butt fusion machine 8. In addition, the tip of the towing wire 7 connected to the winch 6 is fixed to the tip of the pull-in jig 100 in the launch shaft 4.

[0028] In this state, the pull-in jig 100 is pulled into the existing pipe 1 from the launch shaft 4 side by winding up the towing wire 7 using the winch 6. Along with this, the pipeline member 2a is also pulled into the existing pipe 1. As the pipeline member 2a is pulled into the existing pipe 1, another pipeline member 2a is fixed to the rear end of the pulled-in pipeline member 2a by butt fusion. In this way, the rehabilitation pipe 2 can be pulled into the existing pipe 1 while extending the pipeline member 2a (rehabilitated pipe 2).

[0029] The pipeline member 2a is extended while the towing wire 7 is wound up until the pull-in jig 100 reaches the receiving shaft 5. After the pull-in jig 100 reaches the receiving shaft 5, the pipeline member 2a is cut from the pull-in jig 100. In this way, a rehabilitated pipe 2 can be formed inside the existing pipe 1.

[0030] Furthermore, any material can be used for the rehabilitation pipe 2 (pipe member 2a), such as polyethylene, polypropylene, or other synthetic resins.

[0031] In the following section, the specific configuration of the retraction jig 100 according to the first embodiment will be described using Figures 3 to 5.

[0032] The pull-in jig 100 shown in Figures 3 and 4 is used to pull rehabilitation members (for example, protective sheet 3, rehabilitation pipe 2, etc.) used in the pipeline rehabilitation method into the existing pipe 1. The pull-in jig 100 mainly comprises a main body 110, an inner member 120, a reinforcing part 130, and a second engaging part 140.

[0033] The main body portion 110 is a component that forms the main structure of the retraction jig 100. The main body portion 110 is formed in a cylindrical shape. Figures 3 and 4 show the main body portion 110 with its axis oriented forward and backward. The main body portion 110 mainly comprises a first cylindrical portion 111, a second cylindrical portion 112, and a connecting cylindrical portion 113.

[0034] The first cylindrical portion 111 is a cylindrical part having a generally constant diameter (inner and outer diameter) along the axial direction. The first cylindrical portion 111 forms the rear part of the main body portion 110. The outer diameter of the first cylindrical portion 111 is formed to an appropriate size corresponding to the inner diameter of the existing pipe 1.

[0035] The second cylindrical portion 112 is a cylindrical part having a substantially constant diameter (inner and outer diameter) along the axial direction. The second cylindrical portion 112 forms the front part of the main body portion 110. The outer and inner diameters of the second cylindrical portion 112 are smaller than the outer and inner diameters of the first cylindrical portion 111.

[0036] The connecting cylindrical portion 113 is a cylindrical part that connects the first cylindrical portion 111 and the second cylindrical portion 112. The rear end of the connecting cylindrical portion 113 is connected to the front end of the first cylindrical portion 111. The front end of the connecting cylindrical portion 113 is connected to the rear end of the second cylindrical portion 112. The inner and outer diameters of the connecting cylindrical portion 113 are formed to gradually decrease from the first cylindrical portion 111 side (rear side) to the second cylindrical portion 112 side (front side).

[0037] As described above, the main body 110 is formed in a cylindrical shape with a diameter that is narrower at the front than at the rear. The first cylindrical part 111, the second cylindrical part 112, and the connecting cylindrical part 113 are integrally formed. Any material can be used for the main body 110, such as polyethylene or polypropylene synthetic resin. However, as mentioned above, from the viewpoint that the rehabilitation pipe 2 is fixed to the pull-in jig 100 (main body 110) by butt fusion, it is desirable to use the same material for the main body 110 as for the rehabilitation pipe 2.

[0038] The illustrated example shows a main body portion 110 formed integrally by butt-fusing multiple cylindrical members together. Specifically, this embodiment shows an example in which multiple members are fused together in a first fused portion 111a formed in the first cylindrical portion 111 and a second fused portion 112a formed in the second cylindrical portion 112 to form the main body portion 110.

[0039] The inner member 120 is a member positioned inside the main body 110. The inner member 120 mainly comprises a first engaging portion 121, a transmission portion 122, and a rear connecting portion 123.

[0040] The first engaging portion 121 is capable of engaging with the inner circumferential surface of the main body portion 110. The first engaging portion 121 is formed in a substantially frustoconical shape. The first engaging portion 121 is positioned with its axis facing forward and backward. The first engaging portion 121 is positioned such that its outer diameter decreases from rear to front. The first engaging portion 121 is positioned inside the main body portion 110. The outer diameter of the first engaging portion 121 (more specifically, the outer diameter of the widest part) is formed to be smaller than the inner diameter of the first cylindrical portion 111 and larger than the inner diameter of the second cylindrical portion 112. Therefore, the first engaging portion 121 contacts the inner circumferential surface of the main body portion 110 (connecting cylindrical portion 113), thereby restricting its forward movement relative to the main body portion 110.

[0041] The transmission section 122 is a member that transmits the force (force of the traction wire 7) for pulling in the retraction jig 100. The transmission section 122 is formed in a substantially cylindrical shape. The transmission section 122 is positioned with its axis facing forward and backward. The transmission section 122 is positioned coaxially with the first engagement section 121 and is located inside the main body section 110. The rear part of the transmission section 122 is fixed to the first engagement section 121. When the first engagement section 121 is in contact with the inner circumferential surface of the main body section 110 (connecting cylindrical section 113), the front end of the transmission section 122 protrudes forward from the main body section 110. A front connecting section 122a is provided at the front end of the transmission section 122.

[0042] The front connecting portion 122a is a portion to which a member (in this embodiment, a towing wire 7) for pulling the pull-in jig 100 into the existing pipe 1 can be connected. The front connecting portion 122a is formed in a flat plate shape. A through hole for connecting the towing wire 7 is formed in the front connecting portion 122a. The front connecting portion 122a is fixed to the front end of the transmission portion 122 or formed integrally with it. The shape of the front connecting portion 122a is not particularly limited, and its shape can be arbitrarily changed as long as the towing wire 7 can be connected.

[0043] The rear connecting portion 123 is a portion to which a member for pulling the retraction jig 100 backward can be connected. The rear connecting portion 123 is formed in a flat plate shape. The rear connecting portion 123 has a through hole for connecting a wire or the like. The rear connecting portion 123 is fixed to the rear of the transmission portion 122 or formed integrally with it. The rear connecting portion 123 is positioned to protrude backward from the first engaging portion 121. The shape of the rear connecting portion 123 is not particularly limited, and its shape can be arbitrarily changed as long as a wire or the like can be connected to it.

[0044] The reinforcing portion 130 is for reinforcing the main body portion 110 (particularly the second cylindrical portion 112). The reinforcing portion 130 is formed in a cylindrical shape that surrounds the second cylindrical portion 112 from the outer circumference. The inner diameter of the reinforcing portion 130 is formed to be approximately the same as the outer diameter of the second cylindrical portion 112. The reinforcing portion 130 is fitted onto the outer surface of the second cylindrical portion 112. The reinforcing portion 130 is formed from an appropriate material (such as metal). The material of the reinforcing portion 130 is not particularly limited.

[0045] Furthermore, in the illustrated example, the second fused portion 112a of the main body portion 110 is formed immediately in front of the reinforcing portion 130. The bead of the second fused portion 112a protrudes radially outward from the outer circumferential surface of the second cylindrical portion 112. As a result, the forward movement of the reinforcing portion 130, which is fitted into the second cylindrical portion 112, is restricted by the second fused portion 112a.

[0046] The shape of the reinforcing portion 130 is not particularly limited and can be changed as desired. For example, the reinforcing portion 130 can be divided into two (semicircular in front view). In this case, the reinforcing portion 130 can be easily attached to the second cylindrical portion 112 on which the second fused portion 112a is formed by sandwiching the second cylindrical portion 112 between the two reinforcing portions 130 and fixing them to each other.

[0047] The second engaging portion 140 shown in Figures 3 to 5 is a member that restricts the inner member 120 from moving backward relative to the main body 110. The second engaging portion 140 mainly comprises a contact portion 141, a guide portion 142, and a rib portion 143.

[0048] The contact portion 141 is the part that contacts the second cylindrical portion 112. The contact portion 141 is formed in the shape of a circular flat plate. The contact portion 141 is positioned with its plate surface facing front to back. The outer diameter of the contact portion 141 is formed to be larger than the inner diameter of the second cylindrical portion 112. The contact portion 141 is positioned to face the end face (front end face) of the second cylindrical portion 112. A through hole 141a is formed in the center of the contact portion 141. The inner member 120 (transmission portion 122) is inserted through the through hole 141a formed in the contact portion 141.

[0049] The guide portion 142 is for positioning the second engaging portion 140 relative to the second cylindrical portion 112. The guide portion 142 is formed in a substantially cylindrical shape. The guide portion 142 is provided so as to protrude rearward from the rear surface of the contact portion 141. As shown in Figure 5, the guide portion 142 is provided at multiple locations (four locations in the illustrated example) along the inner circumferential surface of the second cylindrical portion 112. This restricts the movement of the contact portion 141 relative to the second cylindrical portion 112 in the up, down, left, and right directions, thereby enabling the positioning of the contact portion 141 relative to the second cylindrical portion 112.

[0050] The rib portion 143 shown in Figures 3 and 4 reinforces the contact portion 141 and is fixed to the inner member 120. The rib portion 143 is formed in a flat plate shape. The rib portion 143 is provided so as to protrude forward from the front surface of the contact portion 141. A pair of rib portions 143 are provided on the left and right so as to sandwich the inner member 120. A bolt B is inserted through the pair of rib portions 143 and the inner member 120 (transmission portion 122), and a nut N is fastened to the bolt B. In this way, the second engaging portion 140 is fixed to the inner member 120.

[0051] Using the pull-in jig 100 configured in this way, rehabilitation members such as the protective sheet 3 and the rehabilitation pipe 2 can be pulled into the existing pipe 1, as described above. For example, the protective sheet 3 can be pulled into the existing pipe 1 by wrapping and fixing the protective sheet 3 around the main body 110 and winding up the pull wire 7 connected to the front connecting part 122a. Alternatively, the rehabilitation pipe 2 can be pulled into the existing pipe 1 by fixing the rehabilitation pipe 2 to the rear of the main body 110 by butt fusion and winding up the pull wire 7 connected to the front connecting part 122a.

[0052] When the front connecting portion 122a (inner member 120) is pulled forward by the towing wire 7, as shown in Figure 4, the first engaging portion 121 of the inner member 120 engages with the inner circumferential surface of the main body portion 110 (connecting cylindrical portion 113). This prevents the inner member 120 from falling forward from the main body portion 110.

[0053] In particular, in this embodiment, the second cylindrical portion 112 is reinforced by the reinforcing portion 130. Therefore, even if a large pulling load is applied to the inner member 120, it is possible to prevent the inner diameter of the second cylindrical portion 112 from expanding (deforming). This makes it possible to more reliably prevent the inner member 120 from falling out of the main body portion 110.

[0054] Furthermore, when a pulling load is applied to the inner member 120, the first engaging portion 121 attempts to widen the inner circumferential surface of the connecting cylindrical portion 113, causing the connecting cylindrical portion 113 and the second cylindrical portion 112 to deform and expand in diameter. Consequently, a forward force is also applied to the reinforcing portion 130 via the connecting cylindrical portion 113 and the second cylindrical portion 112. However, the bead of the second fused portion 112a formed on the front side of the reinforcing portion 130 restricts the forward movement of the reinforcing portion 130, thus preventing the reinforcing portion 130 from moving forward or detaching from the second cylindrical portion 112. This prevents the expansion of the diameter of the second cylindrical portion 112 and the connecting cylindrical portion 113.

[0055] Furthermore, the retraction jig 100 of this embodiment is configured to be pulled back towards the rear (towards the launch shaft 4 side (see Figure 1)) as needed. Specifically, a wire or the like is pre-connected to the rear connecting portion 123 of the retraction jig 100, and the retraction jig 100 can be pulled back towards the rear by pulling the wire from the launch shaft 4 side as needed.

[0056] In this case, the rear connecting portion 123 (inner member 120) is pulled backward, but the backward movement of the inner member 120 is restricted by the second engaging portion 140. Therefore, even if the inner member 120 is pulled backward, the inner member 120 will not fall out of the main body portion 110, and the retraction jig 100 can be pulled backward.

[0057] The following describes how to wrap and secure the protective sheet 3 around the retraction jig 100 configured as described above.

[0058] As shown in Figure 6(a), first, the end of the protective sheet 3 pulled out from the roll 3a is folded back in the longitudinal direction. At this time, as will be described later, when the protective sheet 3 is wrapped around the retraction jig 100, the protective sheet 3 is folded back toward the side opposite to the side facing the retraction jig 100. In the example shown in Figure 6, the protective sheet 3 is wrapped around the retraction jig 100 with the upper surface facing inward (towards the retraction jig 100) (see Figure 6(c)), so the protective sheet 3 is folded back toward the lower side.

[0059] Furthermore, the edges of the protective sheet 3 are folded multiple times. In the example shown in Figure 6(a), the protective sheet 3 is folded twice. This creates a folded portion 3b at the edge of the protective sheet 3, where the protective sheet 3 is arranged in three layers. The length of the folded portion 3b (the length of the protective sheet 3 in the longitudinal direction) is adjusted to be greater than or equal to the length of the retraction jig 100. Note that the number of times the protective sheet 3 is folded is not particularly limited and can be changed as desired.

[0060] Next, as shown in Figure 6(b), both sides of the protective sheet 3's edge, including the folded portion 3b, in the width direction (short side direction) are folded inward in the width direction of the protective sheet 3. At this time, the protective sheet 3 is folded towards the top surface. This forms the edge of the protective sheet 3 into a tapered, roughly trapezoidal shape. This step is performed to adjust the width of the edge of the protective sheet 3 according to the length of the outer circumference of the retraction jig 100, so that the protective sheet 3 can be properly wrapped around the retraction jig 100. Therefore, the width to which the protective sheet 3 is folded can be arbitrarily changed according to the dimensions of the retraction jig 100 and the protective sheet 3. Also, if no adjustment is necessary, the protective sheet 3 does not need to be folded.

[0061] Next, as shown in Figure 6(c), the folded portion 3b of the protective sheet 3 is wrapped around the main body 110 of the retraction jig 100 so that the upper surface of the protective sheet 3 is positioned on the side (inside) of the retraction jig 100. The protective sheet 3 wrapped around the retraction jig 100 is temporarily secured to the retraction jig 100 with masking tape or the like.

[0062] In the example shown in the figure, one protective sheet 3 is wrapped around the pull-in jig 100. However, if, for example, the inner diameter (inner circumference) of the existing pipe 1 is larger than the width of the protective sheet 3, it is possible to wrap multiple protective sheets 3 around the pull-in jig 100. For example, one protective sheet 3 can be wrapped around the pull-in jig 100 from the bottom, and then another protective sheet 3 can be wrapped around it from the top. In this case, the procedure shown in Figure 6 is repeated to wrap multiple protective sheets 3 around one pull-in jig 100. By using multiple protective sheets 3 in this way, the inner surface of the existing pipe 1 can be covered with protective sheets 3 without any gaps.

[0063] Once the required number of protective sheets 3 are wrapped around the retraction jig 100, the protective sheets 3 are tightened and secured to the retraction jig 100 using appropriate fastening members (e.g., binding wire, SUS band, etc.). In this way, the protective sheets 3 are fixed to the retraction jig 100.

[0064] As described above, by wrapping the protective sheet 3 around the pull-in jig 100, the protective sheet 3 is folded back toward the radially outward direction of the pull-in jig 100. By forming such a folded portion 3b, it is possible to prevent the protective sheet 3 (the innermost protective sheet 3) from being damaged by the weight of the pull-in jig 100 or friction with the inner surface of the existing pipe 1 when the protective sheet 3 is pulled into the existing pipe 1.

[0065] As described above, the retraction jig 100 according to this embodiment is A pull-in jig 100 for pulling rehabilitation members (rehabilitation pipe 2 and protective sheet 3) used in the pipeline rehabilitation method into an existing pipe 1, A main body 110 having a first cylindrical portion 111 having a first inner diameter, a second cylindrical portion 112 having a second inner diameter smaller than the first inner diameter, and a connecting cylindrical portion 113 connecting the first cylindrical portion 111 and the second cylindrical portion 112, An inner member 120 having an outer diameter smaller than the first inner diameter and larger than the second inner diameter, having a first engaging portion 121 that can engage with the inner circumferential surface of the main body portion 110, and a transmission portion 122 through which force for pulling in the rehabilitation member is transmitted, It is equipped with the following features. By configuring it in this way, the pull-in jig 100 for pulling the rehabilitation member into the existing pipe 1 can be made into a simple structure. Furthermore, when force is applied to the inner member 120 on the second cylindrical portion 112 side (front side), the first engaging portion 121 can be engaged with the connecting cylindrical portion 113, thereby preventing the transmission portion 122 from falling out of the main body portion 110.

[0066] Furthermore, the retraction jig 100 is The second cylindrical portion 112 is further reinforced by a reinforcing portion 130. By configuring it in this way, the second cylindrical portion 112 is reinforced, which more reliably prevents the transmission portion 122 from falling out of the main body portion 110.

[0067] Furthermore, the reinforcing portion 130 is It is formed to surround the second cylindrical portion 112 from the outer circumference. By configuring it in this way, the reinforcing part 130 can be made into a simple structure.

[0068] Furthermore, the retraction jig 100 is The device further includes a restricting portion (bead of the second fusion portion 112a) that restricts the movement of the reinforcing portion 130 along the axial direction of the second cylindrical portion 112. By configuring it in this way, the movement of the reinforcing portion 130 can be restricted, thereby more reliably reinforcing the second cylindrical portion 112.

[0069] Furthermore, the regulating portion (the bead of the second fusion portion 112a) is It is formed integrally with the main body portion 110. By configuring it in this way, the restricting portion is formed integrally with the main body portion 110, thereby firmly restricting the movement of the reinforcing portion 130.

[0070] Furthermore, the retraction jig 100 is The device further comprises a second engaging portion 140 that engages with the main body portion 110 to restrict the movement of the inner member 120 toward the first cylindrical portion 111 relative to the main body portion 110. By configuring it in this way, applying force to the inner member 120 toward the first cylindrical portion 111 side (rear side) allows the retraction jig 100 to also be moved toward the first cylindrical portion 111 side. This makes it possible to return, for example, a rehabilitation member that has been retracted toward the second cylindrical portion 112 side (front side) back toward the first cylindrical portion 111 side.

[0071] Furthermore, the second engagement portion 140 is It is fixed to the inner member 120, has an outer diameter larger than the inner diameter of the second cylindrical portion 112, and is positioned to face the end face of the second cylindrical portion 112. By configuring it in this way, the second engagement portion 140 can be made into a simple structure.

[0072] Furthermore, the construction method according to this embodiment is A construction method for pulling the rehabilitation member into the existing pipe 1 using a pull-in jig 100, A fixing step of wrapping the sheet-shaped rehabilitation member (protective sheet 3) around the pull-in jig 100 and fixing it, After the fixing step, the retraction step involves pulling the retraction jig 100 to retract the rehabilitation member into the existing pipe 1, Includes, In the aforementioned fixing step, The longitudinal end of the rehabilitation member is folded back to the first surface side of the rehabilitation member to form a folded portion 3b. The folded portion 3b is wrapped around the retraction jig 100 such that the second surface of the rehabilitation member, opposite to the first surface, is positioned on the inside. By configuring it in this way, the folded portion 3b is formed, which helps to prevent damage to the rehabilitation member due to friction with the inner surface of the existing pipe 1 when the rehabilitation member is pulled into the existing pipe 1.

[0073] The rehabilitated pipe 2 and protective sheet 3 according to this embodiment are one form of the rehabilitation member according to the present invention. Furthermore, the bead of the second fusion section 112a according to this embodiment is one form of the regulating section according to the present invention.

[0074] Although embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention as described in the claims.

[0075] For example, the shape, size, etc., of each component constituting the pull-in jig 100 are not particularly limited and can be arbitrarily changed according to the size of the existing pipe 1 to be constructed.

[0076] Furthermore, in this embodiment, a protective sheet 3 and a rehabilitated pipe 2 were given as examples of rehabilitation members that are pulled into the existing pipe 1 using the pull-in jig 100. However, the present invention is not limited to these examples and can be applied to various members used in pipeline rehabilitation methods. For example, a cleaning tool for cleaning the inside of the existing pipe 1, or an application tool for applying lubricant to the existing pipe 1 (protective sheet 3) can also be pulled into the existing pipe 1 using the pull-in jig 100.

[0077] Furthermore, although the reinforcing portion 130 in this embodiment is arranged to surround the second cylindrical portion 112 from the outer circumference, the present invention is not limited to this, and the arrangement of the reinforcing portion 130 can be arbitrarily changed. For example, the reinforcing portion 130 can be arranged on the inner circumference side of the second cylindrical portion 112, or embedded within the wall thickness of the second cylindrical portion 112.

[0078] Furthermore, in this embodiment, the bead of the second fusion portion 112a formed on the main body portion 110 was used as an example of a restricting portion for restricting the movement of the reinforcing portion 130, but the present invention is not limited to this, and the movement of the reinforcing portion 130 can be restricted by any method. For example, the restricting portion can be made of a member formed separately from the main body portion 110. As an example, a bolt or the like can be provided on the front side of the reinforcing portion 130 so as to protrude from the outer circumferential surface of the main body portion 110 (second cylindrical portion 112), and the movement of the reinforcing portion 130 can be restricted by this bolt.

[0079] Furthermore, as shown in the modified example in Figure 7 (second embodiment), it is also possible to use the second engaging portion 140 as a restricting portion for restricting the movement of the reinforcing portion 130. Below, the differences between the retraction jig 100A according to the second embodiment and the first embodiment (see Figure 4) will be mainly explained.

[0080] In the retraction jig 100A according to the second embodiment, the front end surface of the reinforcing portion 130 is positioned to face the rear surface of the second engaging portion 140 (contact portion 141). Furthermore, the second engaging portion 140 is not fixed to the inner member 120, and the second engaging portion 140 and the inner member 120 are positioned to be relatively movable back and forth. The rear surface of the second engaging portion 140 is connected to the inner member 120 (first engaging portion 121) by a tension spring 150, and a force directed backward is applied. The second engaging portion 140 is held in contact with the front end surface of the second cylindrical portion 112 by the force of the tension spring 150.

[0081] When the pipeline rehabilitation method is carried out using the pull-in jig 100A configured in this way, the inner member 120 is pulled forward by the traction wire 7 as described above, and a pull-in load is applied to the inner member 120. When a pull-in load is applied to the inner member 120, the first engaging portion 121 pushes the inner circumferential surface of the connecting cylindrical portion 113 forward, causing the connecting cylindrical portion 113 and the second cylindrical portion 112 to deform and expand in diameter. As a result, a forward force is also applied to the reinforcing portion 130 via the connecting cylindrical portion 113 and the second cylindrical portion 112. However, since the forward movement of the reinforcing portion 130 is restricted by the second engaging portion 140 (contact portion 141) located in front of the reinforcing portion 130, it is possible to prevent the reinforcing portion 130 from moving forward or falling off the second cylindrical portion 112. This prevents the expansion of the diameter of the second cylindrical portion 112 and the connecting cylindrical portion 113.

[0082] In particular, in the second embodiment, even if the main body 110 (connecting cylindrical portion 113) deforms due to the retraction load and the inner member 120 moves forward, the second engaging portion 140 is held in a fixed position (a position in contact with the front end surface of the second cylindrical portion 112) by the force of the tension spring 150. Because the reinforcing portion 130 can be held in a fixed position by this second engaging portion 140, the second cylindrical portion 112 can be reliably reinforced.

[0083] In the second embodiment, an example was shown in which the second engaging portion 140 is held using a tension spring 150, but it is possible to hold the second engaging portion 140 using various other members. For example, it is possible to provide a compression spring between the front end (front connecting portion 122a) of the inner member 120 and the second engaging portion 140 to apply a rearward force to the second engaging portion 140 and hold the second engaging portion 140 in a fixed position.

[0084] Furthermore, the construction method according to this embodiment is also one form of the following invention.

[0085] This invention relates to a construction method for pulling a rehabilitation member into an existing pipe using a pull-in jig.

[0086] Conventionally, the technology for construction methods that involve using a pull-in jig to pull in rehabilitation members into existing pipes has been publicly known. For example, as described in Japanese Patent Publication No. 2012-251591.

[0087] Japanese Patent Publication No. 2012-251591 describes a method in which the end of a protective sheet is formed into a cylindrical shape, the protective sheet is positioned to cover the outer surface of a retraction jig (leading head), and the protective sheet is fixed to the retraction jig with a clamping device. By pulling the retraction jig with the protective sheet fixed in this manner into the existing pipe, the protective sheet can be pulled into the existing pipe.

[0088] However, with this method, there was a risk that the protective sheet would be damaged when it was pulled into the existing pipe due to the weight of the pulling jig or friction with the existing pipe.

[0089] One aspect of this disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a construction method that can prevent damage to the rehabilitated member.

[0090] A construction method relating to one aspect of this disclosure is: A construction method for pulling a rehabilitation member into an existing pipe using a pull-in jig, A fixing step of wrapping the sheet-shaped rehabilitation member around the pull-in jig and fixing it, After the fixing step, the retraction step involves pulling the retraction jig to pull the rehabilitation member into the existing pipe, Includes, In the aforementioned fixing step, A folded portion is formed when one end of the rehabilitation member in the longitudinal direction is folded back towards the first surface side of the rehabilitation member. The folded portion is wrapped around the retraction jig such that the second surface of the rehabilitation member, opposite to the first surface, is positioned on the inside.

[0091] According to one aspect of this disclosure, damage to the rehabilitation member (protective sheet) can be prevented.

[0092] Furthermore, in the above construction method, it is possible to use various types of pull-in jigs, not limited to the pull-in jigs 100 and 100A exemplified in the first and second embodiments. [Explanation of symbols]

[0093] 1 Existing pipe 2 Rehabilitation pipe 3. Protective sheet 3b Folded section 100 Retraction jig 110 Main body 111 First cylindrical part 112 Second cylindrical part 112a Second fused part 113 Connecting cylindrical part 120 Inner component 121 First engaging part 122 Transmission section 130 Reinforcement section 140 Second engaging part

Claims

1. A pull-in jig for pulling rehabilitation members used in pipeline rehabilitation methods into existing pipes, A main body having a first cylindrical portion having a first inner diameter, a second cylindrical portion having a second inner diameter smaller than the first inner diameter, and a connecting cylindrical portion connecting the first cylindrical portion and the second cylindrical portion, An inner member having an outer diameter smaller than the first inner diameter and larger than the second inner diameter, having a first engaging portion that can engage with the inner circumferential surface of the main body, and a transmission portion through which force for pulling in the rehabilitation member is transmitted, A retraction jig equipped with the following.

2. The second cylindrical portion is further provided with a reinforcing portion, The retraction jig according to claim 1.

3. The aforementioned reinforcing portion is The second cylindrical portion is formed to surround the outer circumference, The retraction jig according to claim 2.

4. The second cylindrical portion is further provided with a restricting portion that restricts the movement of the reinforcing portion along the axial direction, The retraction jig according to claim 3.

5. The aforementioned regulatory body, Formed integrally with the main body, The retraction jig according to claim 4.

6. The present invention further comprises a second engaging portion that, by engaging with the main body, restricts the movement of the inner member toward the first cylindrical portion relative to the main body. The retraction jig according to claim 1.

7. The second engagement portion is, It is fixed to the inner member, has an outer diameter larger than the inner diameter of the second cylindrical portion, and is positioned to face the end face of the second cylindrical portion, The retraction jig according to claim 6.

8. A construction method for pulling the rehabilitation member into the existing pipe using the pull-in jig described in any one of claims 1 to 7, A fixing step of wrapping the sheet-shaped rehabilitation member around the pull-in jig and fixing it, After the fixing step, the retraction step involves pulling the retraction jig to pull the rehabilitation member into the existing pipe, Includes, In the aforementioned fixing step, A folded portion is formed when one end of the rehabilitation member in the longitudinal direction is folded back towards the first surface side of the rehabilitation member. The folded portion is wrapped around the retraction jig such that the second surface of the rehabilitation member, opposite to the first surface, is positioned on the inside. Construction method.

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