CN102021945A - Method for connecting HDPE double-wall ripple drainage pipe - Google Patents

Abstract

A HDPE double-wall corrugated drainage pipe interface method. A rubber ring is tightly placed outside the pipe on both sides of the interface. There is a metal collar clamp positioned on the outer wall of the pipe on the periphery of the rubber ring. Fill with flexible material filler in between. Using the interface method of the present invention, under the condition of differential settlement and long-term pressure bearing, the crack resistance and anti-seepage ability of the drainage pipe interface are significantly enhanced, which reduces the damage to the interface caused by the uneven settlement of the pipeline, and effectively prolongs the service life The service life is long, and there is no need for heating construction, and the requirements for equipment and construction conditions are greatly reduced under the premise of ensuring the quality of the interface. The method of the invention is particularly suitable for construction sites with poor soil quality, uneven foundation hardness or karst areas.

Description

A HDPE double-wall corrugated drainage pipe interface method

technical field

The invention relates to the field of municipal drainage pipe interfaces, in particular to a method for interface of HDPE double-wall corrugated drainage pipes.

Background technique

HDPE double-wall corrugated pipe is formed by simultaneously extruding corrugated outer wall and a smooth inner wall of HDPE, and one-time fusion extrusion. The inner wall is smooth and flat, and the outer wall is a pipe with a trapezoidal hollow structure arranged equidistantly. It was first successfully developed in Germany in the early 1980s, and has now developed from a single variety to a series of products. HDPE double-wall corrugated pipe has excellent ring stiffness, good strength and toughness, light weight, strong impact resistance, not easy to break, and easy to transport and install. Due to the special corrugated wall structure of the HDPE double-wall corrugated pipe, the material consumption of the pipe is the least under the condition of the same diameter and the same ring stiffness. Due to its excellent performance and relatively economical cost, the promotion and application of HDPE double-wall corrugated pipe is on the rise, and its production process and technology are already very mature.

The impermeability and durability of drainage pipes depend to a large extent on the quality of the joints when the pipes are laid. At present, the commonly used interface methods for HDPE double-wall corrugated pipes mainly include the following:

1. Rubber ring socket connection

Before connecting the pipes or fittings, check the quality of the rubber ring, confirm the location of the rubber ring, and ensure the cleanliness of the interface surface. When the surface is stained with oil, wipe it off with cotton gauze dipped in detergent; try to connect the two pipe sections before the interface to confirm that the insertion depth and fit meet the requirements, and mark the depth of the insertion socket on the surface of the insertion end. When working on the interface, the rubber ring should be tightly placed on one side of the nozzle, and the rubber rings should be placed on the two pipes on the same axis, and the rubber ring should be adjusted to make it tightly bonded to the outer wall of the pipe; Apply soapy water to the circle as a lubricant. There are many and complicated operation steps in this interface mode, and slight errors or negligence will directly affect the interface quality and operation safety.

2. Heat shrinkable connection

Heat-shrinkable tape series products are designed for the anti-corrosion of buried and overhead steel pipeline welding joints and thermal insulation joint joints of thermal insulation pipelines. It is composed of radiation cross-linked polyolefin substrate and special sealing hot melt adhesive, which can form a good bond with the steel pipe surface and solid epoxy coating. When the WK-WSS heat shrinkable tape is heated and installed, the base material shrinks radially and the internal composite adhesive layer melts, and it is tightly wrapped around the joint, forming a firm anti-corrosion body together with the base material outside the pipe, with excellent resistance Abrasion, corrosion resistance, impact resistance and good resistance to UV and photoaging properties. In addition, the heat-shrinkable tape is called a looper in the industry. In addition to the main body of the heat-shrinkable tape, it is also equipped with adhesive strips and fixing pieces. The heat-shrinkable tape is convenient for large-scale production and construction. However, the heat-shrinkable tape connection has high requirements on materials and must be heated and installed, resulting in high construction costs.

3. Hot melt connection

Hot-melt connections include hot-melt butt connections, hot-melt socket connections and hot-melt saddle connections. When HDPE double-wall corrugated pipe DN≤63, injection molding hot-melt socket connection is usually used; when DN≥75, hot-melt butt joint connection or electric fusion socket connection is mostly used.

(1) Hot-melt butt joint

For polyethylene pipes or pipe fittings with DN<63mm or wall thickness δ<6mm, or with a large difference in melt flow rate, and with different standard size ratios or wall thicknesses at the welded ends, it is not recommended to use hot-melt butt joints; melt flow rate When polyethylene pipes or pipe fittings with little difference are butt-jointed by hot melt, the heating temperature, welding pressure and welding time should be adjusted in time, and the tensile strength, hydrostatic strength and blasting test should be carried out, and they can be used only if they meet the requirements.

The temperature of hot-melt butt joint connection is usually between 200 and 235°C, and the machine tool is required to meet the following requirements: it can work normally in the range of -10°C to 40°C, the switching time of the welding machine can be guaranteed, and the surface of the heating plate is evenly coated with high temperature resistance and anti-sticking There are certain requirements for the centering of the pipe clamp and the axial centering of the frame.

(2) hot-melt socket connection

Pipes with DN<125mm can be connected by manual or mechanical hot-melt socket connection; in recent years, this method has been used less and less in urban water supply polyethylene pipes, but it is more common in building water supply polyethylene pipes.

The fusion temperature of hot-melt socket connection is usually 260±10°C. The requirements for hot-melt socket connection equipment are: the surface of the ring heater should be uniformly coated with a high-temperature anti-sticking layer, the heat can be effectively transferred between the heating plate and the ring heater, and the mechanical welding machine should also be able to ensure the straightness and connection of the joint. The socket can be rounded before.

(3) Electric fusion connection

For the electric fusion connection that has appeared in recent years, the construction equipment is electric fusion welding machine and hot fusion butt welding machine, and the welding equipment should meet the requirements of ISO12176-1 or ISO12176-2.

The advantage of electrofusion is that it is suitable for the connection of pipes of different specifications, grades, and materials, and pipe fittings and pipes. It is not easily affected by external factors, low equipment investment and maintenance costs, simple operation, and the inner wall of the pipe is kept smooth. High reliability. But its disadvantages are that the cost of special electric fusion pipe fittings is high, the special bar codes of pipe fittings of different brands are different, the welding machine is not compatible, and the use efficiency is low.

To sum up, different connection methods have their own advantages and disadvantages. The applicant is committed to seeking an interface method for an HDPE double-wall corrugated pipe that can achieve reliable interface connection, simple operation, and relatively low cost.

Contents of the invention

The technical problem to be solved by the present invention is to provide an interface method for a new HDPE double-wall corrugated drainage pipe with reliable interface quality, smooth operation of the drainage system, simple construction and low operating cost.

The present invention solves the above technical problems with the following technical solutions:

A rubber ring is tightly sleeved outside the pipe on both sides of the interface. There is a metal collar clamp positioned on the outer wall of the tube on the periphery of the rubber ring, and a flexible material filler is filled between the metal collar clamp and the outer wall of the tube.

The length of the metal collar clamp along the central axis of the pipe is greater than the length of the rubber ring along the central axis of the pipe.

The two ends of the rubber ring are respectively located 2-3 peaks away from both sides of the interface.

The flexible material is any one of hemp silk, polystyrene board, polyvinyl chloride foam plastic board.

The HDPE double-wall corrugated drainage pipe interface method of the present invention, under the influence of differential settlement and long-term pressure bearing conditions, the anti-crack and anti-seepage capabilities of the drainage pipe interface are significantly enhanced, and the damage to the interface caused by the pipeline under uneven settlement conditions is reduced. The service life is effectively extended, and there is no need for heating construction, and the requirements for equipment and construction conditions are greatly reduced under the premise of ensuring the quality of the interface.

The method of the invention is particularly suitable for construction sites with poor soil quality, uneven foundation hardness or karst areas.

Description of drawings

Fig. 1 is a schematic diagram of the joint structure of the HDPE double-wall corrugated drainage pipe of the present invention.

Detailed ways

The pipeline interface of the present invention adopts metal collar clamps 4 to cover the periphery of the interface of two HDPE double-wall corrugated drain pipes 1, and a rubber ring 3 is tightly sleeved outside the pipes on both sides of the interface, and the metal collar clamps 4 and A flexible material filler 2 is filled between the outer tube walls.

The length of the metal collar clip along the central axis of the double-wall corrugated drain pipe is greater than the length of the rubber ring along the central axis of the double-wall corrugated drain pipe.

The two ends of the rubber ring are respectively located 2-3 peaks away from both sides of the interface.

The flexible material can be any one of hemp silk, polystyrene board, polyvinyl chloride foam plastic board.

The specific steps of interface construction are described below in conjunction with Figure 1:

(1) Before connecting pipes and fittings, wipe the inside and outside of the interface between pipe A and pipe B with a dry cloth. When there is oil on the surface, wipe it with acetone to ensure that the pipe mouth is clean.

(2) The central axes of the two pipes are aligned, and the two nozzles are aligned.

(3) First, insert one end of the rubber ring into the mouth of either tube A or B for 2-3 peak distances, then align it with the central axis of the other tube, and finally insert the other end of the rubber ring into the The other tube is 2-3 peaks away.

(4) Hoop the metal collar clamp at the joint of the two pipes, and fill the flexible material filling between the metal collar clamp and the outer wall of the pipe.

(5) Tighten the metal collar clamp.

(6) Clean up the debris on the pipe wall at the joint of the two pipes after the construction of the joint is completed.

Claims (4)

1. A HDPE double-wall corrugated drainage pipe interface method is characterized in that a rubber ring is tightly sleeved outside the pipe on both sides of the interface, and the periphery of the rubber ring has a metal collar clamp positioned on the outer wall of the pipe. The gap between the clamp and the outer wall of the pipe is filled with flexible material filling. 2. The HDPE double-wall corrugated drainage pipe joint method according to claim 1, characterized in that the length of the metal collar clamp along the central axis of the pipe is greater than the length of the rubber ring along the central axis of the pipe. 3. The HDPE double-wall corrugated drainage pipe interface method as claimed in claim 1, characterized in that the two ends of the rubber ring are respectively located at a distance of 2-3 peaks on both sides of the interface. 4. The HDPE double-wall corrugated drainage pipe interface method according to claim 1, characterized in that the flexible material can be any one of hemp silk, polystyrene board, and polyvinyl chloride foam board.