A method for connecting large polyethylene pipes

Abstract

The application discloses a large polyethylene pipeline connecting construction method and belongs to the technical field of pipeline connecting and installing. Step one: a trench is excavated to a design elevation position, cement soil is backfilled layer by layer at 200mm per layer and is rammed to reach a 95% compaction degree requirement, and backfilling is performed until the bottom elevation of a sand cushion layer; step two: a 200mm-thick sand cushion layer is constructed and rammed to reach a 95% compaction degree requirement, polyethylene pipelines are installed according to drawing requirements, and pipeline butt joint construction is completed; step three: two turns of water-stop strips with a cross-section width of 30*30mm are wound on each pipeline, and then a steel reinforcement cage is installed, the steel reinforcement cage is composed of three-grade steel with a diameter of 8mm, the single-layer bidirectional spacing is 200mm, and the protective layer thickness is 20mm; step four: a formwork is installed, and finally C30 strength anti-permeability concrete pouring construction is completed, and when the concrete strength reaches 75%, subsequent cement soil backfilling construction can be completed. The application solves the problem that when large polyethylene pipelines are installed in a deep trench in a soft geological layer, the qualified rate of pipeline joints is low.

Description

TECHNICAL FIELD

[0001] The application provides a large polyethylene pipe connection construction method, and relates to the technical field of pipe connection installation. BACKGROUND

[0002] Generally, in the urban area reconstruction or new old rain sewage pipe, for the area with high population density, large polyethylene pipe needs to be used as a drainage pipe, otherwise the normal drainage demand cannot be met, leading to sewage backflow at the drainage well mouth, seriously affecting the normal life and work of residents, and the qualified rate of the pipe interface connection is low during the installation of the large polyethylene pipe due to the reasons of the worker's technology and the difficulty in installing the pipe, and the pipe is difficult to use for a long time. Therefore, the application provides a construction technology for treating the pipe joint to prolong the service life of the pipe when the large polyethylene pipe is installed in the deep foundation trench in the soft geological layer.

[0003] Therefore, the application is provided. SUMMARY

[0004] The technical problem to be solved by the application is that the qualified rate of the pipe joint is low when the large polyethylene pipe is installed in the deep foundation trench in the soft geological layer.

[0005] In order to solve the above technical problem, the inventors have summarized the technical scheme of the application through practice, and the basic idea of the technical scheme of the application is that:

[0006] A large polyethylene pipe connection construction method comprises the following steps:

[0007] Step one: excavate the trench to the design elevation position, backfill the cement soil by layers at 200mm per layer and compact to 95% of the compaction degree requirement, and backfill to the bottom elevation of the sand cushion layer;

[0008] Step two: construct a 200mm thick sand cushion layer, and compact to 95% of the compaction degree requirement, install the polyethylene pipe according to the drawing requirements, and complete the pipe butt joint construction;

[0009] Step three: wrap two turns of the water stop strip with a cross section of 30*30mm on each pipe, then install the steel reinforcement cage, and the steel reinforcement cage is composed of three-level steel with a diameter of 8mm, the single-layer bidirectional spacing is 200mm, and the protective layer thickness is 20mm;

[0010] Step four: install the formwork, and finally complete the pouring construction of the C30 impermeable concrete, and the subsequent cement soil backfill construction can be completed when the concrete strength reaches 75%.

[0011] In a further technical scheme, the pipe butt joint construction in step two comprises the following:

[0012] A1, butt joint; two groups of pipes are butt jointed on a hot melting butt joint welding machine, respectively fixed frame and moving frame, the moving frame moves to make the two pipes initially butt joint, the diameter of the pipe butt joint is determined, and the error is not greater than 5mm;

[0013] A2, end face grinding; the end faces of the two groups of pipes are ground by an end face grinder; the two groups of pipes after grinding need to be checked whether there are bubbles and worn material problems;

[0014] A3, hot melting; a heating plate is installed between the two groups of pipes, heated to 180-240℃, then the heating plate is separated from the two groups of pipes, and the moving frame moves to abut the ports of the two groups of pipes;

[0015] A4, cooling treatment; the pipe butt joint of the two groups of pipes is sprayed and rapidly cooled by adding cooling water.

[0016] In a further technical solution, the reinforcement cage is welded to the surface of the pipe.

[0017] In a further technical solution, the reinforcement cage is provided with a reinforcing member in the middle, which is suitable for reinforcing the pipe butt joint of the two groups of pipes;

[0018] In step two, after the two groups of pipes abut, the port part is suitable for being extruded, and the reinforcing member is suitable for abutting at the pipe butt joint.

[0019] In a further technical solution, the reinforcing member includes a fixed ring located at the pipe butt joint of the two groups of pipes; a plurality of telescopic rods are arranged in the fixed ring, one end of the telescopic rod is fixedly connected with the fixed ring, and a surface sticking arc strip is installed on the side of the telescopic rod opposite to the fixed ring, and the surface sticking arc strip is suitable for being bonded with the pipe butt joint.

[0020] In a further technical solution, the reinforcement cage is provided with a connecting ring, the connecting ring is provided with a sliding rail, a sliding block is installed on the sliding rail, and a patch member is suitable for being installed in the sliding block, and the patch member is suitable for installing a connecting sticker at the connection of the two groups of pipes.

[0021] In a further technical solution, the sliding block includes a fixed shell, support rods are installed on both sides of the fixed shell, and the support rods are arranged in pairs and connected with a roller shaft therebetween;

[0022] The roller shaft is provided with at least two groups, and is suitable for extruding the connecting sticker;

[0023] The connecting sticker includes an adhesive tape and a protective tape, one side of the adhesive tape opposite to the protective tape has adhesion; and the roller shaft is suitable for extruding the adhesive tape at the connection of the two groups of pipes.

[0024] In a further technical solution, a scraper holder is mounted outside the fixed shell, and a scraper is mounted on the scraper holder, which is suitable for dividing the adhesive tape and protecting the tape.

[0025] Two inlet grooves are formed on the two sides of the fixed shell, which are suitable for inserting the connection stickers, and the inlet grooves are located at the upper end of the scraper holder.

[0026] In a further technical solution, the steel cage is provided with a main reinforcement and a reinforcing bar, and the main reinforcement is mounted outside the connecting ring and the reinforcing bar, and the reinforcing bar is parallel to the connecting ring.

[0027] Beneficial effects:

[0028] The application wraps two turns of water-swelling sealing strips at the interface of the large polyethylene pipeline, then installs a steel cage, and finally pours anti-permeable concrete, which makes up for the low qualified rate of the pipeline interface caused by the difficulty in installing large pipelines and the poor operation technology of workers, greatly prolongs the service life of the pipeline, and reduces the maintenance cost in the later period.

[0029] When the steel cage is installed, the reinforcing member or the connecting ring is arranged to enhance the connection strength of the pipeline interface, one is to weld the reinforcing support effect of the steel cage, and the other is to connect the stickers, such as polyethylene adhesive tape, to realize the connection of the two groups of polyethylene pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 It is a large polyethylene pipeline interface schematic diagram of the embodiment 1 of the application;

[0032] Figure 2 It is a large polyethylene pipeline interface front view schematic diagram of the embodiment 1 of the application;

[0033] Figure 3 It is a steel cage schematic diagram of the embodiment 1 of the application;

[0034] Figure 4 It is a large polyethylene pipeline interface cross-sectional schematic diagram of the embodiment 2 of the application;

[0035] Figure 5 It is a steel cage schematic diagram of the embodiment 2 of the application;

[0036] Figure 6 It is a cross-sectional schematic diagram of the steel cage of the embodiment 3 of the application;

[0037] Figure 7 Fig. 1 is a schematic view of the present application; Figure 6

[0038] Figure 8 Fig. 2 is a schematic view of the present application;

[0039] Figure 9 Fig. 3 is a schematic view of the present application;

[0040] Figure 10 Fig. 4 is a schematic view of the present application.

[0041] Fig. 1 is a schematic view of the present application; DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0043] The application principle of the present application is further described below in combination with the drawings and specific embodiments.

[0044] Embodiment 1

[0045] As shown in Fig. 1, it is an embodiment of the present application. A large polyethylene pipe connection construction method comprises the following steps: Figures 1 to 2

[0046] Step one: excavate the trench 7 to the design elevation position, backfill the cement soil 3 by 200mm per layer and compact to 95% compaction degree requirement, and backfill to the bottom elevation of the sand cushion 6;

[0047] Step two: construct the 200mm thick sand cushion 6 and compact to 95% compaction degree requirement, install the polyethylene pipe 1 according to the drawing requirements, and complete the pipe 1 butt joint construction;

[0048] Step three: wrap two circles of water-swelling sealing strip 5 with a cross-sectional width of 30*30mm on each pipe 1, then install the reinforcement cage 4, and the reinforcement cage 4 is composed of 8mm diameter three-grade steel, single-layer double-direction interval of 200mm, and protection layer thickness of 20mm;

[0049] ​​Step 4: Install the template, and finally complete the pouring of C30 impermeable concrete 2. When the strength of concrete 2 reaches 75%, the subsequent cement-soil 3 backfilling construction can be completed.

[0050] The pipe 1 joint construction in step two includes the following:

[0051] A1. Butt welding: Install the two sets of pipes 1 together on the hot melt butt welding machine, which consists of a fixed frame and a movable frame. The movable frame moves to make the two pipes 1 initially butt welded, and the diameter of the butt joint of pipes 1 is determined. There is no error greater than 5mm. The hot melt butt welding is based on the existing equipment structure.

[0052] A2. End face grinding: The end faces of the two sets of pipes 1 are ground by an end face grinding machine; After grinding, the two sets of pipes 1 need to be checked for air bubbles and material wear.

[0053] A3. Heat fusion: Install a heating plate between the two sets of pipes 1, heat to 180-240℃, then remove the heating plate from between the two sets of pipes 1, and move the moving frame to abut the ports of the two sets of pipes 1.

[0054] A4. Cooling treatment: Cooling water is added to the pipe joint 8 of the two sets of pipes 1 for rapid cooling by spraying.

[0055] Example 2

[0056] like Figures 3 to 5 As shown, this is one embodiment of the present invention, based on embodiment 1, as follows: Figure 4 As shown, all of the steel cages 4 are welded to the surface of the pipe 1.

[0057] The steel cage 4 is provided with a reinforcing member in the middle, which is suitable for reinforcing the pipe joint 8 of the two sets of pipes 1.

[0058] In step two, after the two sets of pipes 1 come into contact, the port portion is adapted to be squeezed, and the reinforcement is adapted to abut at the pipe interface 8.

[0059] like Figure 4 As shown, the reinforcement includes a fixing ring 9 located at the pipe joint 8 of the two sets of pipes 1. Multiple sets of telescopic rods 10 are installed inside the fixing ring 9. One end of each telescopic rod 10 is fixedly connected to the fixing ring 9, and a facing arc strip 11 is installed on the side of the telescopic rod 10 facing away from the fixing ring 9. The facing arc strip 11 is suitable for bonding with the pipe joint 8. During installation, the reinforcing cage 4 is rotated to achieve a squeezing effect through the facing arc strip 11 at the pipe joint 8. An adhesive strip can be installed at the pipe joint 8, and squeezing the adhesive strip enhances the connection between the two sets of pipes 1. Simultaneously, this ensures that the main reinforcement bars of the reinforcing cage 4 are connected to the pipes 1 at the same position, facilitating a better connection after welding.

[0060] Example 3

[0061] like Figures 6 to 10 As shown, another embodiment of the present invention is provided. Based on embodiment 1, a connecting ring 12 is provided inside the steel cage 4, a slide rail 13 is provided inside the connecting ring 12, a slider is installed on the slide rail 13, and a patch is adapted to be installed inside the slider. The patch is adapted to install the connecting sticker 17 at the connection of the two sets of pipes 1.

[0062] like Figure 7 As shown, the slider includes a fixed shell 14, and support rods 15 are installed on both sides of the fixed shell 14. The support rods 15 are installed in pairs and connected by rollers 16. At least two sets of rollers 16 are provided, and they are suitable for pressing and connecting stickers 17.

[0063] like Figure 8 As shown, the steel cage 4 is provided with main bars 41 and reinforcing bars 42. The main bars 41 are installed on the outside of the connecting ring 12 and the reinforcing bars 42, and the reinforcing bars 42 are parallel to the connecting ring 12.

[0064] like Figure 10 As shown, the connecting sticker 17 includes an adhesive tape 171 and a protective tape 172, the side of the adhesive tape 171 opposite to the protective tape 172 being adhesive; the roller 16 is adapted to press the adhesive tape 171 at the connection of the two sets of pipes 1.

[0065] A scraper holder 18 is installed on the outside of the fixed shell 14, and a scraper 19 is installed on the scraper holder 18. The scraper 19 is suitable for separating the adhesive tape 171 and the protective tape 172.

[0066] The fixed shell 14 has inlet grooves on both sides, which are not shown in the figure. The inlet grooves are suitable for inserting the connecting sticker 17 and are located at the upper end of the scraper holder 18.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0068] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A construction method for connecting large polyethylene pipes, characterized in that, Includes the following steps: Step 1: Excavate the trench (7) to the design elevation, backfill with cement soil (3) in layers of 200mm each and compact it to achieve 95% compaction, and continue backfilling until the bottom elevation of the sand cushion layer (6) is reached; Step 2: Construct a 200mm thick sand cushion layer (6) and compact it to achieve a 95% compaction degree. Install the polyethylene pipe (1) according to the drawing requirements and complete the joint construction of the pipe (1). Step 3: Wrap two turns of water-swellable waterstop strips (5) with a cross section width of 30*30mm around each pipe (1), and then install the steel cage (4). The steel cage (4) is composed of grade III steel with a diameter of 8mm, a single layer with a two-way spacing of 200mm, and a protective layer thickness of 20mm. The steel cage (4) is provided with a reinforcement member, which reinforces the pipe joint (8) of the two sets of pipes (1); In step two, after the two sets of pipes (1) come together, the port is squeezed and the reinforcement abuts at the pipe interface (8); The reinforcement includes a retaining ring (9) located outside the pipe connection interface (8) of the two sets of pipes (1); Multiple sets of telescopic rods (10) are provided inside the fixed ring (9). One end of the telescopic rod (10) is fixedly connected to the fixed ring (9). A faceted arc strip (11) is installed on the side of the telescopic rod (10) facing away from the fixed ring (9). The faceted arc strip (11) is bonded to the pipe interface (8). Step 4: Install the template and finally complete the pouring of C30 impermeable concrete (2). When the concrete (2) reaches 75% strength, the subsequent cement soil (3) backfilling construction can be completed.

2. The construction method for connecting large polyethylene pipes according to claim 1, characterized in that, The pipe (1) joint construction in step two includes the following: A1. Butt joint; The two sets of pipes (1) are installed on the hot melt butt welding machine, which consists of a fixed frame and a movable frame. The movable frame moves to make the two pipes (1) be connected for the first time, and the diameter of the pipe (1) at the joint is determined. There is no error greater than 5mm. A2. End face grinding; The end faces of the two sets of pipes (1) are ground by an end face grinding machine; After grinding, the two sets of pipes (1) need to be checked for air bubbles and material wear. A3. Heat melting; Install a heating plate between the two sets of pipes (1), heat to 180-240℃, then move the heating plate away from the two sets of pipes (1), and move the moving frame to abut the ports of the two sets of pipes (1); A4. Cooling treatment: At the pipe joint (8) of the two sets of pipes (1), cooling water is added for rapid cooling by spraying.

3. The construction method for connecting large polyethylene pipes according to claim 1, characterized in that, In step three, after installing and moving the steel cage (4), the steel cage (4) is welded to the surface of the pipe (1).

4. The construction method for connecting large polyethylene pipes according to claim 2, characterized in that, A connecting ring (12) is provided inside the steel cage (4), a slide rail (13) is provided inside the connecting ring (12), a slider is installed on the slide rail (13), a patch is installed inside the slider, and the patch installs the connecting sticker (17) at the connection of the two sets of pipes (1).

5. A construction method for connecting large polyethylene pipes according to claim 4, characterized in that, The slider includes a fixed shell (14), and support rods (15) are installed on both sides of the fixed shell (14). The support rods (15) are installed in pairs and connected by rollers (16). At least two sets of rollers (16) are provided, which are extruded and connected to the sticker (17); The connecting sticker (17) includes an adhesive tape (171) and a protective tape (172), the adhesive tape (171) being adhesive on the side opposite the protective tape (172); the roller (16) presses the adhesive tape (171) at the connection of the two sets of pipes (1).

6. A construction method for connecting large polyethylene pipes according to claim 5, characterized in that, A scraper holder (18) is installed outside the fixed shell (14), and a scraper (19) is installed on the scraper holder (18). The scraper (19) is used to separate the adhesive tape (171) and the protective tape (172). The fixed shell (14) has inlet slots on both sides, into which the connecting sticker (17) is inserted and the inlet slots are located at the upper end of the scraper holder (18).

7. A construction method for connecting large polyethylene pipes according to claim 6, characterized in that, The steel cage (4) is provided with main bars (41) and reinforcing bars (42). The main bars (41) are installed on the outside of the connecting ring (12) and the reinforcing bars (42). The reinforcing bars (42) are parallel to the connecting ring (12).

Images