A construction method for conveniently replacing drainage pipes in old residential areas

Abstract

The present invention discloses a construction method for conveniently replacing drainage pipes in old residential areas, which includes the following steps: S1, drilling; S2, replacing the riser; S3, installing a rubber water stop ring; S4, installing a PVC hole hanging support plate; S5, backfilling; S6, waterproof treatment; S7, sealing treatment. The present invention has the following advantages and effects: By setting a unique construction process, the hidden trouble of leakage at the riser position can be effectively solved without damaging the floor tiles, and the impact on the lives of the owners is relatively small. It can not only shorten the construction period, ensure the construction quality, but also greatly reduce the later maintenance and repair, and has good economy.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and particularly relates to a construction method for conveniently replacing drainage pipes in old residential areas. Background Art

[0002] In urban renewal, when replacing the water supply and drainage pipes in water-using rooms such as indoor toilets and kitchens in old residential buildings, according to the construction drawings, first remove the original floor tiles and the slope-forming layer on the ground, drill holes at the position of the original pipes, and then replace the risers.

[0003] However, some residents' homes have just been renovated and do not allow the destruction of floor tiles. Considering the potential leakage problem, when replacing the water supply and drainage risers without removing the floor tiles, concrete needs to be poured at the joints, and the potential for water leakage is relatively large. Moreover, most people live in their homes during urban renewal, making the rectification more difficult.

[0004] Therefore, considering that residents are still living indoors during the indoor renovation, it has become an urgent problem to minimize the impact on residents' lives to the greatest extent while making the indoor renovation period shorter and the quality better. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a construction method for conveniently replacing drainage pipes in old residential areas, which has the effects of convenient construction and reducing the impact on residents' lives.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: A construction method for conveniently replacing drainage pipes in old residential areas includes the following steps:

[0007] S1, Drilling: Place and install the water drill adjusting locator on the ground, use the water drill adjusting locator to position the water drill, restrict the vertical movement of the drill bit, and make the new hole drilled by the water drill coaxial with the old hole at the original position and have a diameter larger than the old hole at the original position;

[0008] S2, Replacing the riser: Vertically pass the new riser through the new hole, and adjust the position of the riser to make it in the centered state, ensuring a 1 cm gap between the riser and the new hole;

[0009] S3, Installing the rubber water stop ring: Sleeve the rubber water stop ring on the outer wall of the riser, make the rubber water stop ring embedded in the new hole and located in the middle of the floor slab;

[0010] S4, Installing the PVC hole plugging support plate: Paste the expansion water stop strip around the face of the PVC hole plugging support plate, and sleeve and fix the PVC hole plugging support plate on the outer wall of the riser, making the PVC hole plugging support plate installed on the top of the riser on the lower layer and fitting to the floor slab of the lower layer;

[0011] S5, backfilling, pouring C40 grouting material in the gap between the riser and the new hole of the floor slab, with the top of the grouting material 5mm above the floor slab surface;

[0012] S6, waterproof treatment, apply 1.5mm thick cement-based waterproof coating on the top of the grouting material;

[0013] S7, sealing treatment, the outer wall of the vertical pipe is wrapped with an imitation marble PVC outer tube with a color similar to the top of the floor slab. The outer tube is covered with grouting material, and the junction between the outer tube and the floor slab is sealed with sealing paste.

[0014] In a preferred example, the present invention can be further configured as follows: the PVC hanging hole support plate includes a pair of semicircular support plates, the pair of support plates are buckled together to form mounting holes that fit the outer wall of the vertical pipe, and the bottom positions of the pair of support plates are fixed by bolts to clamp the vertical pipe.

[0015] In a preferred example, the present invention can be further configured as follows: a plurality of back ribs arranged along the diameter direction of the support plate are provided at intervals on the bottom of the support plate.

[0016] In a preferred embodiment, the present invention can be further configured as follows: the water drill adjustment positioner includes:

[0017] The support frame is arranged in a rectangular shape and includes two wall-leaving rods and two external rods, wherein the two wall-leaving rods are used to lean against adjacent shear walls, and the two external rods connect the two wall-leaving rods;

[0018] A positioning ring is arranged inside the support frame;

[0019] Transverse support rods are provided on both sides of the positioning ring;

[0020] Longitudinal support rods; arranged on the other two sides of the positioning ring;

[0021] The support frame is provided with sliding holes arranged along its length, and the transverse support rods and the longitudinal support rods are slidably connected to the sliding holes in the transverse and longitudinal directions;

[0022] A locking mechanism is used to fix the transverse support rod and the longitudinal support rod that are slidably connected to the outer rod.

[0023] In a preferred example, the present invention can be further configured as follows: the locking mechanism includes a locking rod, a rubber pressure head, a reset member and a driving mechanism, the locking rod is vertically slidably connected to the transverse support rod and the longitudinal support rod, the rubber pressure head abuts against the top wall of the sliding hole, the reset member is arranged on the locking rod for applying an inward resilient force to the locking rod, and the driving mechanism is used to control the vertical sliding of the locking rod.

[0024] In a preferred embodiment, the present invention can be further configured as follows: the driving mechanism includes a rotating shaft, a cam, and a handle. The rotating shaft horizontally penetrates the end faces of the transverse rod and the longitudinal rod. The cam is disposed at the inner end of the rotating shaft and is used to press the locking rod to slide after rotation. The handle is disposed at the outer end of the rotating shaft.

[0025] In a preferred embodiment, the present invention can be further configured as follows: the locking mechanism further includes a fixed rod, a suction cup, and a restoring member. The fixed rod is opposite to the locking rod and is vertically slidably connected to the transverse rod and the longitudinal rod. The suction cup is disposed at the lower end of the fixed rod. A strip hole for the suction cup to slide and penetrate is provided on the lower end face of the outer rod. The restoring member is disposed on the fixed rod and is used to apply a retracting elastic force to the fixed rod, and the cam is a double-sided protrusion.

[0026] In a preferred embodiment, the present invention can be further configured as follows: dovetail blocks are provided on one side of the transverse rod and the longitudinal rod close to the positioning ring, and a dovetail groove for the dovetail blocks to slide and embed is provided on the outer wall of the positioning ring.

[0027] In a preferred embodiment, the present invention can be further configured as follows: scale lines are provided on all four sides of the support frame.

[0028] In summary, the present invention has the following beneficial effects:

[0029] 1. By setting a unique construction process, the hidden danger of leakage at the riser position can be effectively solved without damaging the floor tiles, and the impact on the lives of the owners is small. It can not only shorten the construction period, ensure the construction quality, but also greatly reduce the later maintenance and repair, and has good economy;

[0030] 2. By setting a PVC hole plugging tray with stable structure and convenient installation, a seal is formed on the lower floor slab, increasing the sealing performance and effectively solving the hidden danger of leakage at the riser position;

[0031] 3. By setting a diamond drill adjusting positioner, the positioning during diamond drill drilling can be realized, ensuring that the newly drilled hole is coaxial with the old hole, and at the same time reducing the damage to the tiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a construction schematic diagram of step S1 of the embodiment;

[0033] Figure 2 It is a construction schematic diagram of step S2 and step S3 of the embodiment;

[0034] Figure 3 It is a construction schematic diagram of step S4 of the embodiment;

[0035] Figure 4 It is a construction schematic diagram of steps S5 and S6 of the embodiment;

[0036] Figure 5 It is a construction schematic diagram of step S7 of the embodiment;

[0037] Figure 6 It is a structural schematic diagram of the PVC hole hanging support plate of the embodiment;

[0038] Figure 7 It is an unfolded structural schematic diagram of the PVC hole hanging support plate of the embodiment;

[0039] Figure 8 It is a structural schematic diagram of the diamond drill bit adjusting and positioning device of the embodiment;

[0040] Figure 9 It is an internal structural schematic diagram of the support frame of the embodiment;

[0041] Figure 10 is Figure 9 a partial enlarged view of place A in

[0042] Figure 11 It is a structural schematic diagram of the positioning ring, transverse support rod and longitudinal support rod of the embodiment.

[0043] Reference numerals: 01, floor slab; 011, main structural layer; 012, leveling layer; 013, ceramic tile surface layer; 02, riser pipe; 03, rubber water stop ring; 04, PVC hole hanging support plate; 041, support plate; 042, mounting hole; 043, back brace; 05, expansion water stop strip; 06, grouting material; 07, cement-based waterproof coating; 08, outer pipe; 09, sealant; 1, diamond drill bit adjusting and positioning device; 11, support frame; 111, wall-abutting rod; 112, outer rod; 113, scale line; 114, sliding hole; 115, strip hole; 12, positioning ring; 13, transverse support rod; 14, longitudinal support rod; 15, locking mechanism; 151, locking rod; 152, rubber pressing head; 153, reset member; 154, fixed rod; 155, suction cup; 1,56, return member; 16, driving mechanism; 161, rotating shaft; 162, cam; 163, handle; 17, dovetail block; 18, dovetail groove. Detailed implementation manners

[0044] The present invention will be further described in detail below with reference to the accompanying drawings.

[0045] Embodiment 1:

[0046] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the figure, a construction method for conveniently replacing drainage pipes in old residential areas includes the following steps:

[0047] S1. Drilling: Lay the water drill adjuster 1 flat and install it on the ground. Then adjust the water drill adjuster 1 and insert the water drill vertically. Use the water drill adjuster 1 to position the water drill and restrict the vertical movement of the drill bit to complete the drilling. When drilling, make the new hole drilled by the water drill coaxial with the old hole at the original position and have a diameter larger than the old hole at the original position. At the same time, after drilling, re-drill the upper part of the new hole to make the new hole in the shape of a cone with a thicker upper part and a thinner lower part.

[0048] S2. Replacing the riser pipe 02: Vertically pass the new riser pipe 02 through the new hole, and adjust the position of the riser pipe 02 to make the riser pipe 02 in the center of the new hole, and try to ensure that the riser pipe 02 is coaxial with the new hole. At the same time, ensure that there is a 1 cm gap between the riser pipe 02 and the upper end of the new hole.

[0049] S3. Installing the rubber water stop ring 03: Slip the rubber water stop ring 03 onto the outer wall of the riser pipe 02, so that the rubber water stop ring 03 is embedded in the new hole and located in the middle of the floor slab 01. The floor slab 01 includes a main structure layer 011, a leveling layer 012 and a ceramic tile surface layer 013, and the rubber water stop ring 03 is located at the position between the main structure layer 011 and the leveling layer 012.

[0050] S4. Installing the PVC hole plugging support plate 04: First, paste the expansion water stop strip 05 around the face of the PVC hole plugging support plate 04, and slip and fix the PVC hole plugging support plate 04 onto the outer wall of the riser pipe 02, so that the PVC hole plugging support plate 04 is installed on the top of the riser pipe 02 on the lower layer and is fitted and pressed against the lower surface of the main structure layer 011 of the floor slab 01 on the lower layer to form a seal on the lower layer floor slab 01.

[0051] S5. Backfilling: Pour C40 grouting material 06 into the gap of the new hole between the riser pipe 02 and the floor slab 01. The top of the grouting material 06 is 5 mm higher than the surface of the floor slab 01, so as to form a connection between the riser pipe 02 and the floor slab 01, and can achieve the fixation of the riser pipe 02 and the waterproofing of the new hole position.

[0052] S6. Waterproof treatment: Apply a 1.5 mm thick cement-based waterproof coating 07 on the top of the grouting material 06 to prevent water from seeping into the grouting material 06, ensure the dryness of the grouting material 06, and at the same time prevent water leakage.

[0053] S7. Sealing treatment: Use an imitation marble PVC outer pipe 08 with a color similar to the top of the ceramic tile surface layer 013 to wrap and seal the outer wall of the riser pipe 02. The diameter of the outer pipe 08 is larger than the diameter of the new hole, and it covers and wraps the grouting material 06. The joint between the outer pipe 08 and the ceramic tile surface layer 013 is sealed with a sealant 09 to form a seal.

[0054] Example 2:

[0055] like Figure 5 、 Figure 6 、 Figure 7 As shown, the PVC hanging hole support plate 04 includes a pair of semi-circular support plates 041. The pair of support plates 041 interlock together to form a circular ring shape, and a mounting hole 042 is formed in the middle position to fit the outer wall of the vertical pipe 02. Therefore, when installing the PVC hanging hole support plate 04, the two pieces are combined to achieve convenient installation of the PVC hanging hole support plate 04 and enable the PVC hanging hole support plate 04 to fit the outer wall of the vertical pipe 02.

[0056] like Figure 5 、 Figure 6 、 Figure 7 As shown, a pair of support plates 041 are bolted together at their bottoms and clamp onto riser 02, securely fixing PVC eyelet support plate 04 to the outer wall of riser 02 and supporting expansion waterstop 05. Multiple back ribs 043 are spaced along the bottom of support plates 041, extending along their diameter to increase their structural strength, secure expansion waterstop 05, and enhance waterproofing performance.

[0057] Example 3:

[0058] like Figure 8 、 Figure 9 As shown, the water drill adjusting positioner 1 includes a support frame 11 , a positioning ring 12 , a transverse support rod 13 , a longitudinal support rod 14 and a locking mechanism 15 .

[0059] like Figure 8 、 Figure 9 As shown, the support frame 11 is arranged in a rectangular shape and includes two wall rods 111 and two external rods 112. The two wall rods 111 are arranged at right angles and are used to rely on adjacent right-angled shear walls to achieve the positioning of the support frame 11. The two external rods 112 are arranged at right angles and connect and fix the two wall rods 111 to form a rectangular frame.

[0060] like Figure 8 、 Figure 9 As shown, a positioning ring 12 is disposed within the support frame 11 and can be moved to any position within the support frame 11. Positioning ring 12 is positioned at the location of the old hole, ensuring that it is coaxial with the old hole. The positioning ring 12 also allows the drill bit of a water drill to pass through it, ensuring the coaxiality of the new hole with the old hole. Scale lines 113 are provided around the perimeter of the support frame 11 to precisely control the sliding position and amount of the positioning ring 12.

[0061] like Figure 8 、 Figure 9As shown, there are two transverse support rods 13 and two longitudinal support rods 14. The two transverse support rods 13 and longitudinal support rods 14 are arranged on both sides of the positioning ring 12 and are arranged in a cross shape. The support frame 11 is provided with sliding holes 114 arranged along its length. The transverse support rods 13 and longitudinal support rods 14 are slidably connected to the sliding holes 114 transversely and longitudinally to adjust the position of the positioning ring 12.

[0062] As Figure 8 、 Figure 9 shown, the locking mechanism 15 is used to fix the transverse support rod 13 and longitudinal support rod 14 slidably connected to the external rod 112 to fix the positioning ring 12.

[0063] When it is necessary to position the drilling position, place the support frame 11 on the ground, make the wall-relying rod 111 contact the shear wall to limit the support frame 11. At the same time, the old hole is located inside the support frame 11. Then control the positioning ring 12 to slide. Since both the transverse support rod 13 and longitudinal support rod 14 can slide transversely and longitudinally, the positioning ring 12 can be easily slid to the position of the old hole. Subsequently, according to the scale line 113 and the position of the old hole, the precise positioning of the position of the positioning ring 12 is achieved. Finally, use the locking mechanism 15 to fix the transverse support rod 13 and longitudinal support rod 14, and the fixing of the positioning ring 12 can be realized. Subsequently, the drill bit of the water drill can pass through the positioning ring 12, and the positioning of the water drill is realized by using the positioning ring 12, ensuring that the coaxiality of the newly drilled hole and the old hole is consistent.

[0064] As Figure 9 、 Figure 10 shown, the locking mechanism 15 includes a locking rod 151, a rubber pressing head 152, a resetting member 153, a fixing rod 154, a suction cup 155 and a restoring member 156.

[0065] As Figure 9 、 Figure 10 shown, the locking rod 151 is vertically slidably connected to the transverse support rod 13 and longitudinal support rod 14. The rubber pressing head 152 is used to contact the top wall of the sliding hole 114 after the locking rod 151 slides. The resetting member 153 includes a baffle and a spring. The baffle is arranged on the locking rod 151, and the spring is sleeved outside the locking rod 151 and is used to apply a retracting elastic force to the locking rod 151.

[0066] As Figure 9 、 Figure 10As shown in the figure, the fixed rod 154 is opposite to the locking rod 151 and is vertically and slidably connected to the transverse support rod 13 and the longitudinal support rod 14. A suction cup 155 is provided at the lower end of the fixed rod 154. A strip-shaped hole 115 for the suction cup 155 to slide and pass through is provided on the lower end surface of the outer rod 112. The suction cup 155 is used to suck tightly on the ceramic tile surface layer 013 after passing through the strip-shaped hole 115. The restoring member 156 also includes a baffle and a spring. The baffle is provided on the fixed rod 154. The spring is sleeved outside the fixed rod 154 and is used to apply an inward shrinking restoring force to the fixed rod 154.

[0067] As Figure 9 , Figure 10 shown in the figure, a driving mechanism 16 for controlling the synchronous sliding of the locking rod 151 and the fixed rod 154 is further provided on the transverse support rod 13 and the longitudinal support rod 14 that are slidably connected to the outer rod 112.

[0068] As Figure 9 , Figure 10 shown in the figure, the driving mechanism 16 includes a rotating shaft 161, a cam 162 and a handle 163. The rotating shaft 161 horizontally penetrates the end faces of the transverse support rod 13 and the longitudinal support rod 14. The cam 162 has two-way protrusions and is provided at the inner end of the rotating shaft 161 and is located between the locking rod 151 and the fixed rod 154, and is used to press the locking rod 151 to slide after rotation. The handle 163 is provided at the outer end of the rotating shaft 161 and is used to control the rotation of the rotating shaft 161.

[0069] After the position of the positioning ring 12 is adjusted, control the handle 163 to drive the rotating shaft 161 to rotate. At this time, the rotating shaft 161 drives the cam 162 to move synchronously and presses the locking rod 151 and the fixed rod 154 to move outward.

[0070] When the locking rod 151 moves outward: the locking rod 151 drives the rubber pressing head 152 to move synchronously and presses against the top wall of the sliding hole 114, so as to fix the transverse support rod 13 and the longitudinal support rod 14, and then quickly complete the locking and fixing of the positioning ring 12.

[0071] When the fixed rod 154 moves outward: the fixed rod 154 drives the suction cup 155 to move synchronously. At this time, the suction cup 155 adsorbs on the surface of the ceramic tile surface layer 013 after passing through the strip-shaped hole 115, and at the same time realizes the fixation of the entire support frame 11. At the same time, since the suction cup 155 is fixed on the ceramic tile surface layer 013, the fixation of the fixed rod 154 and the locking rod 151 is also realized, so as to ensure that the positioning ring 12 can be stably fixed on the support frame 11.

[0072] When it is necessary to disassemble the support frame 11, an iron sheet can be inserted under the support frame 11. The suction cup 155 is provided with upwardly warped edges around it, and the iron sheet is located between the warped edges and the ceramic tile surface layer 013. Then, the pressure inside the suction cup 155 is released, and the handle 163 is rotated in the reverse direction to achieve the convenient disassembly of the support frame 11.

[0073] As Figure 11 shown, on one side of the transverse support rod 13 and the longitudinal support rod 14 close to the positioning ring 12, there are respectively provided with dovetail blocks 17, and on the outer wall of the positioning ring 12, there is a dovetail groove 18 for the dovetail blocks 17 to slide and embed. Therefore, when replacing the positioning ring 12 with different diameters, directly pull the positioning ring 12 to slide, which can realize the convenient disassembly of the positioning ring 12, and at the same time, it can also realize the convenient installation of the positioning ring 12, facilitating the workers to drill holes with different diameters.

[0074] The specific embodiments are only explanations of the present invention, and they do not limit the present invention. After reading this specification, those skilled in the art can make modifications to the embodiments without creative contributions according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A construction method for conveniently replacing drainage pipes in old residential areas, characterized by: The steps include: S1, drilling, placing and installing the water drill adjusting positioner (1) on the ground, using the water drill adjusting positioner (1) to position the water drill, restricting the vertical movement of the drill bit, and making the new hole drilled by the water drill coaxial with the old hole at the original position and having a larger diameter than the old hole at the original position; The water drill adjustment positioner (1) comprises: The support frame (11) is arranged in a rectangular shape and comprises two wall-leaving rods (111) and two external rods (112), wherein the two wall-leaving rods (111) are used to lean against adjacent shear walls, and the two external rods (112) connect the two wall-leaving rods (111); A positioning ring (12) is arranged inside the support frame (11); Transverse support rods (13) are arranged on both sides of the positioning ring (12); Longitudinal support rods (14) are arranged on the other two sides of the positioning ring (12); The support frame (11) is provided with a sliding hole (114) arranged along its length, and the transverse support rod (13) and the longitudinal support rod (14) are connected to the sliding hole (114) in a transverse and longitudinal sliding manner; A locking mechanism (15) for fixing the transverse support rod (13) and the longitudinal support rod (14) slidably connected to the outer rod (112); S2, replace the vertical pipe (02), pass the new vertical pipe (02) vertically through the new hole, and adjust the position of the vertical pipe (02) so that the vertical pipe (02) is in the center, ensuring that there is a 1 cm gap between the vertical pipe (02) and the new hole; S3, installing the rubber water blocking ring (03), sleeve the rubber water blocking ring (03) on the outer wall of the vertical pipe (02), so that the rubber water blocking ring (03) is embedded in the new hole and located in the middle of the floor slab (01); S4, install the PVC hanging hole support plate (04), stick the expansion water stop strip (05) to the four sides of the surface of the PVC hanging hole support plate (04), and fit the PVC hanging hole support plate (04) on the outer wall of the vertical pipe (02), so that the PVC hanging hole support plate (04) is installed on the top of the vertical pipe (02) of the next layer and fits to the floor slab (01) of the next layer; S5, backfilling, pouring C40 grouting material (06) in the gap between the riser (02) and the new hole of the floor slab (01), and the top of the grouting material (06) is 5mm higher than the surface of the floor slab (01); S6, waterproofing treatment, applying 1.5mm thick cement-based waterproof coating (07) on the top of the grouting material (06); S7, sealing treatment, the outer wall of the vertical pipe (02) is encapsulated with an imitation marble PVC material outer tube (08) with a color similar to the top of the floor slab (01), the outer tube (08) is covered with grouting material (06), and the junction between the outer tube (08) and the floor slab (01) is sealed with a sealing paste (09).

2. A construction method for conveniently replacing drainage pipes in old residential areas according to claim 1, characterized in that: The PVC hanging hole supporting plate (04) comprises a pair of semicircular support plates (041), the pair of support plates (041) are buckled together to form a mounting hole (042) that fits the outer wall of the vertical pipe (02), and the bottom positions of the pair of support plates (041) are fixed by screwing bolts to clamp the vertical pipe (02).

3. A construction method for conveniently replacing drainage pipes in old residential areas according to claim 2, characterized in that: The bottom of the support plate (041) is provided with a plurality of back ribs (043) arranged along the diameter direction thereof at intervals.

4. A construction method for conveniently replacing drainage pipes in old residential areas according to claim 1, characterized in that: The locking mechanism (15) includes a locking rod (151), a rubber pressure head (152), a reset member (153) and a driving mechanism (16); the locking rod (151) is vertically slidably connected to the transverse support rod (13) and the longitudinal support rod (14); the rubber pressure head (152) abuts against the top wall of the sliding hole (114); the reset member (153) is arranged on the locking rod (151) and is used to apply an inward resilient force to the locking rod (151); and the driving mechanism (16) is used to control the vertical sliding of the locking rod (151).

5. A construction method for conveniently replacing drainage pipes in old residential areas according to claim 4, characterized in that: The driving mechanism (16) comprises a rotating shaft (161), a cam (162) and a handle (163). The rotating shaft (161) horizontally passes through the end faces of the transverse support rod (13) and the longitudinal support rod (14). The cam (162) is arranged at the inner end of the rotating shaft (161) and is used to press the locking rod (151) to slide after rotating. The handle (163) is arranged at the outer end of the rotating shaft (161).

6. A construction method for conveniently replacing drainage pipes in old residential areas according to claim 5, characterized in that: The locking mechanism (15) further comprises a fixing rod (154), a suction cup (155) and a return member (156). The fixing rod (154) is opposite to the locking rod (151) and is vertically slidably connected to the transverse support rod (13) and the longitudinal support rod (14). The suction cup (155) is arranged at the lower end of the fixing rod (154). The lower end surface of the external rod (112) is provided with a strip hole (115) for the suction cup (155) to slide and penetrate. The return member (156) is arranged on the fixing rod (154) and is used to apply an inward retracting elastic force to the fixing rod (154). The cam (162) is a bidirectional protrusion.

7. The construction method for conveniently replacing drainage pipes in old residential areas according to claim 1 is characterized by: The transverse support rod (13) and the longitudinal support rod (14) are both provided with a dovetail block (17) on one side close to the positioning ring (12), and the outer wall of the positioning ring (12) is provided with a dovetail groove (18) for the dovetail block (17) to slide and embed.

8. The construction method for conveniently replacing drainage pipes in old residential areas according to claim 1 is characterized by: Scale lines (113) are provided on all four sides of the support frame (11).

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