Connection structure and connection method

Abstract

To provide a connection structure capable of simply connecting a branch pipe to a ribbed pipe.SOLUTION: A connection structure 1 comprises: a main pipe 2 having a rib 5 on an outer peripheral surface; a branch pipe 3 attached to the main pipe 2; a first adhesive member 8 that adheres to the branch pipe 3 to the main pipe 2; a slide pipe 9 having an annular part 11 slidably externally fitted to the branch pipe 3, and a flange 12 extending from the annular part 11 and engaging with the peripheral surface of the main pipe 2; a sleeve 10 that keeps the slide pipe 9 and an outer peripheral part of the branch pipe 3 liquid-tight; a second adhesive member 13 provided on the main pipe 2 side of the flange 12 and positioned in a recess part 14 of the rib 5 to tightly attach the flange 12 to the main pipe 2; and an embedding member 15 that is disposed around the branch pipe 3 and the slide pipe 9, and fixes the branch pipe 3 and the slide pipe 9 together.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a connection structure for attaching a branch pipe to a ribbed pipe buried in the ground, for example, and Connection Method Regarding. [Background technology]

[0002] Various types of connection structures of this kind have been proposed in the past.

[0003] For example, Patent Document 1 discloses a connection structure in which a connection hole of a ribbed pipe and an attachment pipe are connected by a waterproof flexible joint.

[0004] In this connection structure, the waterproof flexible joint has a flexible joint body, a plate-shaped waterproof member, and a rigid presser cover.

[0005] This joint body has a cylindrical portion that fits tightly against the outer periphery of the attachment pipe, and a saddle portion that projects outward from the cylindrical portion and overhangs the rib around the connection hole.

[0006] The waterproof member is provided below the saddle portion so as to surround the connection hole.

[0007] The presser cover is then fastened to the ribbed pipe with a cable tie, so that the presser cover presses the saddle portion and the water-stopping member against the ribbed pipe.

[0008] As a result, the water-stopping member is compressed and deformed to embed the ribs, thereby creating a watertight seal between the saddle portion and the ribbed pipe. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-28374 Summary of the Invention [Problem to be solved by the invention]

[0010] However, since the pressure cover is fastened to the ribbed pipe with a cable tie, the cable tie must be wrapped around the ribbed pipe, which requires extensive work to remove soil and sand from around the ribbed pipe.

[0011] The present invention was made based on the above circumstances, and its object is to provide a connection structure that allows a branch pipe to be easily connected to a ribbed pipe, and connection parts to be used therefor. [Means for solving the problem]

[0012] In order to solve the above problems, the connection structure according to the present invention comprises a main pipe having a rib on its outer circumferential surface, a branch pipe attached to the main pipe, a first adhesive member for adhering the branch pipe to the main pipe, a slide pipe having an annular portion slidably fitted onto the branch pipe and a flange extending from the annular portion and engaging with the outer circumferential surface of the main pipe, a sleeve for keeping the slide pipe and the outer circumferential portion of the branch pipe liquid-tight, a second adhesive member provided on the main pipe side of the flange and positioned in a recess of the rib to tightly attach the flange to the main pipe, and a fixing member disposed around the branch pipe and slide pipe for fixing the branch pipe and slide pipe together. The sleeve connects the annular portion and the branch pipe, thereby allowing the slide pipe to slide relative to the branch pipe and making the gap between the branch pipe and the slide pipe liquid-tight. This is characterized by the fact that

[0013] Furthermore, the connection according to the present invention method has ribs on the outer surface and mounting port Connecting a branch pipe to a main pipe having method And, a first adhesive member for adhering the branch pipe to the main pipe; a slide pipe having an annular portion slidably fitted onto the branch pipe and a flange extending from the annular portion and engaging with the circumferential surface of the main pipe; and a sleeve for maintaining a liquid-tight seal between the slide pipe and the outer periphery of the branch pipe. a second adhesive member provided on the main pipe side of the flange and positioned in the recess of the rib to tightly bond the flange and the main pipe; connecting the annular portion and the branch pipe with a sleeve to allow the slide pipe to slide relative to the branch pipe and making the gap between the branch pipe and the slide pipe liquid-tight; applying the first adhesive member to the tip of the branch pipe and the second adhesive member to the main pipe side of the flange; inserting the tip of the branch pipe into the attachment port and applying pressure to bond the branch pipe to the main pipe; and applying pressure to the slide pipe toward the main pipe to embed the second adhesive member in the recess of the rib to bond the slide pipe to the main pipe; It is characterized by the following. [Effects of the Invention]

[0014] The connection structure according to the present invention and Connection MethodAccording to this, a branch pipe can be easily connected to a ribbed pipe. [Brief explanation of the drawings]

[0015] The drawings illustrate specific embodiments of the invention according to the present disclosure, including essential features of the invention as well as alternative and preferred embodiments. [Figure 1] 1 is a cross-sectional view showing a connection structure according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a perspective view showing a state in which a connecting part used in the same connecting structure is attached to a branch pipe before construction. [Figure 5] A process diagram showing the method of attaching a branch pipe to a main pipe using the same auger bit. [Figure 6] FIG. 4 is a perspective view showing the tip of a guide pipe used in the installation method. [Figure 7] FIG. 4 is a side cross-sectional view showing the attached state of a guide tube used in the attachment method. [Figure 8] FIG. 2 is a perspective view showing a valved auger bit used in the installation method. [Figure 9] FIG. 10 is a perspective view showing a valved auger bit used in the same installation method. [Figure 10] FIG. 10 is a cross-sectional side view showing the excavation state inside the guide pipe according to the installation method. [Figure 11] FIG. 10 is a cross-sectional side view showing the soil discharge state inside the guide pipe of the same installation method. [Figure 12] A side cross-sectional view showing the main pipe drilling state using the same installation method. [Figure 13] FIG. 10 is a cross-sectional side view showing the branch pipe connection state of the same installation method. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] In FIG. 1, reference numeral 1 denotes a connection structure according to one embodiment of the present invention.

[0018] This connection structure 1 includes a connection part 4 for connecting a branch pipe 3 to a main pipe (ribbed pipe) 2 buried in the ground.

[0019] As shown in FIGS. 2 and 3, the main pipe 2 has a large number of ribs 5 on its circumferential surface.

[0020] In addition, this main pipe 2 is formed with an attachment port 6 for attaching a branch pipe 3 thereto.

[0021] An attachment pipe (specially shaped branch pipe) 7 is fitted and fixed to the tip of the branch pipe 3 , and this attachment pipe 7 is inserted into the attachment port 6 .

[0022] Before insertion, a first adhesive member 8 is applied to the outer peripheral surface of the tip of the attachment pipe 7, thereby adhesively fixing the attachment pipe 7 to the attachment port 6 of the main pipe 2.

[0023] As the first adhesive member 8, for example, a water-swellable rubber elastic sealing material or the like is used.

[0024] In addition, the tip of the attachment pipe 7 is rounded before insertion so that it does not protrude into the inside of the main pipe 2.

[0025] As shown in FIG. 4, the connection part 4 includes a slide tube 9 and a sleeve (polysleeve) 10 made of, for example, polyethylene resin.

[0026] The slide pipe 9 has an annular portion 11 that is slidably fitted onto the branch pipe 3 , and a flange 12 that extends from the annular portion 11 and engages with the circumferential surface of the main pipe 2 .

[0027] The flange 12 is provided in an annular shape around the attachment port 6, and the lower surface thereof is curved along the outer periphery of the rib 5 of the main pipe 2.

[0028] The sleeve 10 is formed into a cylindrical shape using a flexible resin sheet or the like, and its lower end is joined to the outer periphery of the annular portion 11 of the slide tube 9, and its upper end is joined to the outer periphery of the branch tube 3.

[0029] This allows the slide pipe 9 to slide relative to the branch pipe 3, and the slide pipe 9 and the outer periphery of the branch pipe 3 are kept liquid-tight.

[0030] In addition, a second adhesive member 13 is provided on the main pipe 2 side of the flange 12, and this second adhesive member 13 is interposed or embedded in a recess 14 of the rib 5, thereby tightly fixing the flange 12 and the main pipe 2 together.

[0031] As the second adhesive member 13, for example, an epoxy resin sealant or the like is used.

[0032] Furthermore, an embedding material (fixing member) 15 made of cement, bentonite, etc. is arranged around the branch pipe 3 and the connecting part 4 (slide pipe 9 and sleeve 10), thereby fixing the branch pipe 3 and slide pipe 9 together.

[0033] Next, a connection method for the connection structure 1 configured as above will be described with reference to FIG.

[0034] First, the advance pushing step ST1 is performed.

[0035] In this advance pushing process ST1, the installation position of the branch pipe 3 is determined in advance, and a general-purpose auger bit (not shown) with spiral fins on the circumferential surface of the shaft is connected to the main shaft transmission rod of the boring machine and rotated while being pushed forward, thereby loosening the ground at the installation position.

[0036] Next, the earth and sand are removed while the general-purpose auger bit is pulled up, and a borehole is formed.

[0037] Next, the guide tube pushing step ST2 is performed.

[0038] In this guide pipe jacking step ST2, a guide pipe (earth retaining steel pipe) 21 shown in FIG. 6 is lowered into the excavation hole formed in the advance jacking step ST1.

[0039] The guide pipe 21 includes a pipe body 22 and a blade pipe 23 connected to the tip of the pipe body 22 .

[0040] As shown in FIG. 7, the tip of the blade pipe 23 is rounded so that it can fit radially onto the outer circumferential surface of the main pipe 34.

[0041] Next, the main shaft transmission rod is connected to the guide pipe 21 and is advanced by repeatedly rotating forward and backward until it is brought into close contact with the main pipe 2 and fixed.

[0042] The symbol G indicates the natural ground, and the symbol S indicates the soil and sand that make up the natural ground G that has been loosened by the general-purpose auger bit.

[0043] Next, the guide pipe soil discharge step ST3 is carried out.

[0044] In this guide pipe inside soil discharge step ST3, a valved auger bit 31 shown in Figs. 8 and 9 is used.

[0045] This valved auger bit 31 is attached at its base end 32 to the main shaft transmission rod (not shown) of the boring machine and drills at its tip 33. It has a rotatable hollow tubular shaft 34 extending from the base end 32 to the tip 33.

[0046] A guide member 35 is attached to the outer peripheral surface of the tip 33 side of the shaft 34 to guide the earth and sand S from the tip 33 toward the base end 32 as the shaft 34 rotates.

[0047] The guide member 35 includes a first fin 36 and a second fin 37 that are inclined and symmetrically provided along the outer circumferential surface of the shaft 34 .

[0048] The first fin 36 and the second fin 37 are each provided over a length of approximately one-quarter of the entire circumference of the shaft 34, and are formed in a shape that constitutes part of a spiral shape.

[0049] The tips of the first fin 36 and the second fin 37 are formed as digging edges 38 and 39, respectively.

[0050] Further, the guide member 35 is provided with a blocking member 40 for blocking the soil S guided by the guide member 35 from returning.

[0051] The blocking member 40 has a first rotary valve 41 and a second rotary valve 42 .

[0052] The first rotary valve 41 is pivotally supported by a first hinge 43 provided on the back surface (surface on the tip 33 side) of the first fin 36 on the base end 32 side, and is configured to be rotatable from a position on the base end 32 side of the first fin 36 (the state shown in Figure 8) to a position where its free end 44 abuts against the upper surface of the tip 33 side of the second fin 37 (the surface on the base end 32 side) (the state shown in Figure 9).

[0053] In addition, the second rotary valve 42 is pivotally supported by a second hinge 45 provided on the back surface (surface on the tip 33 side) of the second fin 37 on the base end 32 side, and is configured to be rotatable from a position on the base end 32 side of the second fin 37 (the state shown in Figure 8) to a position where the free end 46 abuts against the upper surface (surface on the base end 32 side) of the first fin 36 on the tip 33 side (the state shown in Figure 9).

[0054] Furthermore, the first rotary valve 41 and the second rotary valve 42 are each formed in a shape that constitutes a part of a spiral shape.

[0055] Furthermore, the inclination of the spiral shapes of the first rotary valve 41 and the second rotary valve 42 is greater than the inclination of the spiral shapes of the first fin 36 and the second fin 37 .

[0056] Furthermore, a ventilation valve 47 is provided at the tip 33 inside the shaft 34 so that an opening 48 at the tip 33 of the shaft 34 can be opened and closed.

[0057] That is, the tip 33 of the shaft 34 has an uneven shape consisting of recesses 49 and protrusions 50 .

[0058] The ventilation valve 47 is slidably supported on the inner peripheral side of the protrusion 50, and is configured to close the opening 48 when slid toward the base end 32 as shown in Figure 8, and to open the opening 48 when slid toward the tip end 33 as shown in Figure 9.

[0059] First, in this guide pipe soil discharging step ST3, the soil S in the guide pipe 21 is discharged using the valved auger bit 31, as shown in FIG.

[0060] At this time, when the valved auger bit 31 is rotated forward and advanced, the first rotary valve 41 and the second rotary valve 42 rotate upward and are inclined at a greater angle than the inclination of the first fin 36 and the second fin 37 .

[0061] That is, the free ends 44, 46 of the first rotary valve 41 and the second rotary valve 42 rotate to a position closer to the base end 32 than the first fin 36 and the second fin 37.

[0062] Therefore, the passage for the soil and sand S is opened widely, and the amount of soil discharged can be increased.

[0063] Next, as shown in FIG. 11, the valved auger bit 31 is pulled up to remove the soil.

[0064] At this time, the first rotary valve 41 and the second rotary valve 42 rotate to a position where they abut against the first fin 36 and the second fin 37, respectively, to close the passage for the soil and sand S, thereby ensuring reliable soil removal.

[0065] Furthermore, when the auger bit 31 is pulled up, the vent valve 47 is opened to communicate with the atmosphere through the inside of the shaft 34 and the opening 48, thereby reducing the resistance to pulling up the valved auger bit 31.

[0066] Next, the main pipe drilling process ST4 is carried out.

[0067] In this main pipe drilling step ST4, as shown in FIG. 12, a main pipe drilling bit 51 is lowered into the guide pipe 21, and the main pipe 2 is drilled to form an attachment opening 6. At this time, the rib 5 is also cut along the mounting opening 6.

[0068] Next, the main pipe drilling bit 51 is pulled up and the drilling core (the part of the main pipe 2 that was cut off by drilling) is recovered.

[0069] Next, a branch pipe connecting step ST5 is performed.

[0070] As shown in FIG. 13, an attachment pipe (branch pipe with special shape) 7 is fitted and fixed onto the tip of the branch pipe 3 .

[0071] The tip of this attachment pipe 7 is rounded based on the recovered drilling core so that it does not protrude into the main pipe 2.

[0072] Furthermore, the branch pipe 3 and the attachment pipe 7 are fitted and fixed to the outside of the connection parts 4 (slide pipe 9 and sleeve 10).

[0073] That is, the annular portion 11 of the slide tube 9 is connected to the branch tube 3 and the attachment tube 7 by a sleeve 10, thereby allowing the slide tube 9 to slide relative to the attachment tube 7 and making the gaps between the branch tube 3 and the attachment tube 7 and the slide tube 9 liquid-tight.

[0074] Next, a first adhesive member 8 is applied to the tip of the attachment pipe 7 .

[0075] In addition, a second adhesive member 13 is applied to the main pipe 2 side of the flange 12 of the slide pipe 9.

[0076] Then, the attachment pipe 7 is inserted into the attachment port 6 of the main pipe 2 and pressure is applied to crimp and join them.

[0077] Furthermore, pressure is applied to the slide tube 9 toward the main pipe 2 to embed the second adhesive member 13 into the recess 14 of the rib 5 and adhere it to the main pipe 2 .

[0078] Next, a backfilling material 15 such as cement or bentonite is filled between the guide pipe 21 and the branch pipe 3, the attachment port 6 and the connection part 4.

[0079] Next, a guide tube extraction and removal step ST6 is carried out.

[0080] In this guide tube pulling-out and removal step ST6, the guide tube 21 is pulled out and removed as the embedding material 15 hardens.

[0081] Furthermore, silica sand 52 is poured around the branch pipe 3, the attachment pipe 7 and the connecting part 4 while the guide pipe 21 is being pulled out.

[0082] In this way, as shown in FIG. 1, the installation of the branch pipe 3, the attachment pipe 7, and the connection part 4 to the underground main pipe 2 is completed.

[0083] According to the above configuration, the branch pipe 3 can be easily connected to the main pipe 2 (ribbed pipe) buried in the ground using the guide pipe 21.

[0084] The disclosure of the present invention described above can be summarized at least as follows.

[0085] In other words, the connection structure of the present invention is characterized by comprising a main pipe having a rib on its outer peripheral surface, a branch pipe attached to the main pipe, a first adhesive member that adheres the branch pipe to the main pipe, a slide pipe having an annular portion that is slidably fitted onto the branch pipe and a flange that extends from the annular portion and engages with the outer peripheral surface of the main pipe, a sleeve that keeps the slide pipe and the outer peripheral portion of the branch pipe liquid-tight, a second adhesive member that is provided on the main pipe side of the flange and is interposed in the recess of the rib to tightly seal the flange and main pipe, and a fixing member that is arranged around the branch pipe and slide pipe and fixes the branch pipe and slide pipe together.

[0086] In addition, the connecting part of the present invention is a connecting part used to connect a branch pipe to a main pipe having ribs on its outer surface, and is characterized by comprising a slide tube having an annular portion that is slidably fitted onto the branch pipe and a flange that extends from the annular portion and engages with the outer surface of the main pipe, and a sleeve that keeps the slide tube and the outer periphery of the branch pipe liquid-tight.

[0087] The above invention may include at least the following embodiments, which may be adopted separately or in combination with each other.

[0088] (1) The flange is arranged in a circular shape around the branch pipe, and the surface on the main pipe side is formed in a curved shape along the outer periphery of the rib.

[0089] (2) The sleeve is formed into a cylindrical shape from a flexible resin sheet and is joined to the outer periphery of the annular portion and the outer periphery of the branch pipe. [Explanation of symbols]

[0090] 1. Connection structure 2 main pipes 3 branch pipes 4 Connecting parts 5. Ribs 7. Attachment pipe (specially shaped branch pipe) 8 First adhesive member 9 Slide Tube 10 sleeves 11 Annular section 12 Tsuba 14 Recess 13 Second adhesive member 15 Fixing material (embedded material)

Claims

1. a main pipe having ribs on its outer circumferential surface; a branch pipe attached to the main pipe; a first adhesive member that adheres the branch pipe to the main pipe; a slide pipe having an annular portion slidably fitted onto the branch pipe and a flange extending from the annular portion and engaging with the circumferential surface of the main pipe; a sleeve that keeps the slide pipe and the outer periphery of the branch pipe liquid-tight; a second adhesive member provided on the main pipe side of the flange and interposed in the recess of the rib to tightly bond the flange and the main pipe; a fixing member disposed around the branch pipe and the slide pipe and fixing the branch pipe and the slide pipe together, A connection structure characterized in that the sleeve connects the annular portion to the branch pipe, allowing the slide pipe to slide relative to the branch pipe and making the gap between the branch pipe and the slide pipe liquid-tight.

2. 2. The connection structure according to claim 1, wherein the flange is provided in an annular shape around the branch pipe, and the surface of the main pipe is formed in a curved shape along the outer periphery of the rib.

3. The connection structure according to claim 1 or 2, characterized in that the sleeve is formed into a cylindrical shape from a flexible resin sheet, one end of which is joined to the outer periphery of the annular portion and the other end of which is joined to the outer periphery of the branch pipe.

4. A method for connecting a branch pipe to a main pipe having ribs and a connection port on its outer circumferential surface, comprising: a first adhesive member that adheres the branch pipe to the main pipe; a slide pipe having an annular portion slidably fitted onto the branch pipe and a flange extending from the annular portion and engaging with the circumferential surface of the main pipe; a sleeve that keeps the slide pipe and the outer periphery of the branch pipe liquid-tight; a second adhesive member provided on the main pipe side of the flange and interposed in the recess of the rib to tightly bond the flange and the main pipe; Prepare By connecting the annular portion and the branch pipe with the sleeve, the slide pipe can slide relative to the branch pipe, and a gap between the branch pipe and the slide pipe is made liquid-tight; Applying the first adhesive member to the tip of the branch pipe; The second adhesive member is applied to the main pipe side of the flange; The tip of the branch pipe is inserted into the attachment port and pressure is applied to bond the branch pipe to the main pipe; The slide tube is adhered to the main pipe by applying pressure to the slide tube toward the main pipe to embed the second adhesive member into the recess of the rib. A connection method characterized by:

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