CN103292036B - An Assembled Curved Steel Pipe Jacking Joint - Google Patents

Abstract

The invention discloses an assembled curved steel jacking pipe joint which is characterized in that one end of a steel jacking pipe joint is provided with a socket, the other end of the steel jacking pipe joint is provided with a socket, corresponding sockets and sockets of two sections of steel jacking pipe joints form a pair of joint pairs, the ends of the socket and the socket are respectively provided with a stiffening circular ring, and the rear part of the stiffening circular ring is provided with a longitudinal stiffening inner attachment plate. The longitudinal stiffening inner flitch of the female end and the female end is respectively provided with a detachable fixed plate, and an assembled force transmission top plate is arranged between the detachable fixed plate of the female end and the female end corresponding to two adjacent steel pipe sections and is connected with the detachable fixed plate of the female end through a limit bolt. A wood gasket is arranged between the assembled force transmission top plate and the detachable fixing plate at the socket end. A jack can be arranged between the detachable fixing plates of the socket end and the socket end. The invention has the advantages of simple structure, compact arrangement, convenient construction, firm structure, lower cost, easier operation during construction and shorter construction period.

Description

An Assembled Curved Steel Pipe Jacking Joint

technical field

The invention relates to the field of steel pipe jacking, in particular to an assembled curved steel pipe jacking joint head and a jacking method thereof.

Background technique

Pipe jacking construction technology is an environmentally friendly technology for laying underground pipelines without excavation. Under the condition of not disturbing or slightly disturbing the soil structure outside the pipe, with the help of the thrust of the jacking equipment such as the main jacking pump, the tool pipe or roadheader is passed from the working well through the soil layer along the line and enters the receiving well; at the same time, A construction method for laying underground pipelines in which the following pipelines are sequentially connected and buried in the pipeline soil layer connecting the two wells. The pipes suitable for pipe jacking generally include concrete pipes (including ordinary concrete pipes, reinforced concrete pipes, and steel cylinder concrete pipes), steel pipes, and glass fiber reinforced plastic sand pipes.

In the prior art, the steel pipe jacking basically adopts the welding method to process the joints between the pipe joints. This joint processing method not only has problems such as long welding time and complicated operation process. More importantly, due to the rigidity of its joints, steel pipes are not suitable as pipe materials for curved pipe jacking. Moreover, the structure of the relay room used in the straight steel pipe jacking is complex, considering more construction requirements, and less consideration for dismantling and closing, resulting in a large processing workload and poor durability after the jacking is completed, which will affect the service life of the steel pipe jacking. weak link.

Contents of the invention

The purpose of the present invention is to provide an assembled curved steel pipe jacking joint head. During jacking, the joints of the pipe joints are flexible through simple assembly, which can be used as the relay room of pipe jacking or the connection between pipe joints of curved pipe jacking. ; After the pipe jacking is completed, it can be converted into a rigid joint.

In order to achieve this goal, the technical solution of the present invention is: an assembled curved steel pipe jacking joint head, which is characterized in that a socket is provided at one end of the steel pipe jacking joint, and a grouting hole and a water-stop rubber ring are reserved on the socket Groove, the other end of the steel pipe jacking pipe joint is provided with a socket, the corresponding socket and socket of the two steel pipe jacking pipe joints form a pair of joint heads, and the ends of the socket and the socket are respectively provided with stiffening rings. The rear part of the ring is provided with a longitudinal stiffening inner plate. The longitudinally stiffened inner panels at the socket end and the socket end are respectively installed with detachable fixed plates, and two adjacent steel pipe joints are installed between the detachable fixed plates at the corresponding socket end and socket end, and an assembled force transmission top plate is installed, and through the limit Bolted. A wooden spacer is arranged between the assembled force transmission top plate and the detachable fixed plate.

Another object of the present invention is to provide a jacking method for assembled curved steel pipe jacking joints. During jacking, the joints of the pipe joints are made flexible through simple assembly, which can be used as the relay room for pipe jacking or each of the curved pipe jacking joints. The connection between the pipe sections; after the pipe jacking is completed, it can be converted into a rigid joint.

In order to achieve the above object, the technical solution of the present invention is: a jacking method for an assembled curved steel pipe jacking joint head, comprising the following steps: A. The longitudinal stiffening inner plates at the socket end and the socket end are respectively installed with detachable fixing plates After aligning the pipes, an assembled force transmission top plate is installed between the corresponding socket end of the two steel pipe joints and the detachable fixed plate at the socket end, and connected by limit bolts, the assembled force transmission top plate and the detachable fixed plate at the socket end There are wooden spacers between them; B. During jacking, the two pipe joints rely on the assembled force transmission top plate and the detachable fixed plate to transmit the jacking force between the joints to the joint head; C. During the construction of the curved section, Use a jack to apply a jacking force on the side of the pipe that needs to be stretched, and then fix it with a limit bolt to form a curve; D. After the pipe jacking of the curve is completed, remove the jack, the assembled force-transmitting top plate and the detachable fixing plate, and put the socket end The gap between the joint head and the end of the socket is welded with a steel plate to form a rigid connection; E. Use the reserved grouting hole to press out the thick paste liquid anti-corrosion coating to seal the gap between the joint heads. Packed to form a corrosion barrier.

The invention is developed for the needs of curved pipe jacking of steel pipes. It is a flexible connection during jacking, and it is converted into a rigid connection after the jacking is completed. It has the characteristics of simple structure, compact layout, and convenient construction. The steel pipe can also be used as a relay room for steel pipe jacking in the application occasion of the curved pipe jacking field. The invention makes the joints of the steel pipes flexible during jacking, so as to carry out relay jacking and deflection correction of the pipe jacking; when the curved steel pipe is jacked, the jacking force can be transmitted, and the curve can also be turned through the opening angle to realize the curve. After the jacking is completed, no cutting is required, and only a small amount of welding is required to transform into a rigid connection. The invention simplifies the joint head configuration of the relay room or the curved steel pipe jacking, most of the materials are reused, and reduces the complicated cutting and welding workload when the relay room or the curved steel pipe jacking joint head is closed. The invention has the advantages of simple structure, compact layout, assembly type, less processing and closing workload, lower cost, easier operation during construction, and shorter construction period. It can be used as a trunk for steel jacking pipes or as a pipe joint for curved steel jacking pipes.

Description of drawings

Figure 1 is a diagram of the socket structure of the curved steel pipe jacking joint head pair.

Fig. 2 is the socket structure diagram of the curved steel pipe jacking joint head pair.

Figure 3 is a detailed assembly diagram of the head pair during straight jacking.

Figure 4 is a detailed assembly diagram of the joint head when using a jack to form a curve.

Figure 5 is a diagram of the closing process of the joint head pair after the jacking is completed.

detailed description

As shown in Figure 1, an assembled curved steel pipe jacking joint is characterized in that one end of the steel pipe jacking joint is provided with a socket 1, and the other end is provided with a socket 2, and the socket 2 and socket 1 are used as a secondary joint The pair is pre-fabricated in the factory and welded with the steel pipe joint body on site. The ends of socket 2 and socket 1 are respectively provided with stiffening rings 3 to increase the circumferential rigidity of the elastic pipe mouth, and the rear of stiffening rings 3 is provided with longitudinal stiffening inner plates 4, which serve as the joint point for transmitting the jacking force and assembling the jacking tool . After the two sections of steel pipes are welded to the sockets and sockets of the joint heads respectively, a detachable fixing plate 5 is installed on the longitudinal stiffening inner plate 4 of the corresponding socket end and socket end of the two steel pipe jacking pipe joints to form a complete curve jacking pipe joints. After aligning the pipes, the detachable fixed plate 5 at the socket end is connected to one end of the assembled force transmission top plate 7 through the limit bolt 6, and the other end of the assembled force transmission top plate 7 is connected to the detachable fixed plate 5 at the socket end through the limit bolt 6 Connection, wooden spacers 8 are set between the assembled force transmission top plate and the detachable fixed plate, and straight line jacking can be carried out. Since there is a jack installation hole in the assembled force transmission top plate, the jack can be used to expand and contract according to the need, and the angle is opened to realize the turning between the pipe joints.

According to an embodiment of the present invention, the length of the auxiliary socket of the joint head is 0.6~0.8m, wherein the length of the socket extending beyond the stiffening ring 3 is 0.38~0.45m, the length of the socket is 0.3~0.5m, and the socket extends The length outside the stiffening ring 3 is 0.15-0.2m. A stiffening ring 3 (also known as an annular stiffening plate) is provided at the ends of the socket and the socket respectively along the entire pipeline. The width of the ring is about twice the thickness of the pipeline. According to this embodiment, the wall thickness of the steel pipe is 18-22mm. The width of the stiffening ring is 36~44mm. The rear of the ring stiffening plate is provided with a longitudinal stiffening inner sticking plate 4, which transmits the jacking force and assembles the jacking tool. The stiffening ring and the longitudinal stiffening inner plate increase the rigidity of the steel pipe at the joint and control the radial deformation of the joint. A grouting hole 9 and a water-stop rubber ring groove 10 are reserved on the socket.

As shown in Figure 2, after the socket and the socket are respectively welded to the steel pipe body, the detachable fixed plate 5 is respectively assembled to transmit the jacking force, so that the linear jacking force is transformed into the axial pressure on the stiffening ring 3 and the longitudinal inner plate 4 radial pressure. The socket water-stop rubber ring groove 10 is packed into the water-stop rubber ring 11, and after the pipeline is matched, an assembled force transmission top plate 7 and a wooden spacer 8 are installed between the assembled and disassembled fixed plates. And fix with limit bolt 6, limit bolt when carrying out the fixing of straight line jacking and the spacing of opening angle when curve jacking. Wood gaskets are 18mm~22mm thick, which can improve the axial force transmission of the steel pipe and prevent the deformation and instability of the steel pipe under uneven pressure; the rubber sealing ring is mainly to ensure the water stop during the pipe jacking process, and the section of the rubber sealing ring is wedge-shaped or round.

During the jacking process, the jacking force is transmitted to the detachable fixed plate 5 by means of the assembled force transmission top plate 7 between the two pipes, and then transmitted to the stiffening ring 3 and the longitudinal stiffening inner plate 4. On the one hand, the wooden gasket 8 can compensate the unevenness of the end faces of the assembled force-transmitting top plate 7 and the detachable fixed plate 5, and increase the uniformity of the force; The end face forms an inclined angle during the curve jacking, and can maintain the opening degree between the pipe joints.

During the construction of the curved section, loosen the limit bolt 6 on the side that needs to be opened, install the jack 12 between the socket end and the detachable fixing plate at the socket end, and one end of the jack is pushed against the detachable fixing plate at the socket end , and the other end pushes against the detachable fixed plate at the socket end through the round hole of the assembled force transmission top plate, and uses the jack to apply uneven jacking force. Increase the thickness of wooden spacers between the end faces of the fixed plate 5, and fix them with limit bolts to form a force-transmitting rigid body for curved pipe jacking. It is also possible to change the position of the jack and adjust the angle according to the measurement results. The connection of pipe joints during jacking is shown in Figure 3.

For curved pipe jacking, the number of pipe sections, the length of pipe sections and the opening angle of each section should be determined in advance according to the arc length and radius of curvature of the curve.

After the curved pipe jacking is completed, in order to ensure the cross-section of the flow, the detachable fixed plate 5, the assembled force transmission top plate 7, the limit bolt 6, and the wooden spacer 8 are removed, and the gap between the end of the socket and the end of the socket is removed. The steel plate 12 is pasted in the gap (and the gap between the socket end and the ring stiffening plate of the socket), and welded to form a rigid connection. Since the inner wall of the pipe is welded, the temperature outside the welded steel pipe is relatively high, so it is necessary to use a high-temperature-resistant external anti-corrosion coating in advance to do special treatment on the affected area of the weld. After the welding is completed, use the grouting hole to inject the thick paste type anti-corrosion coating 13 outwards to fill the gap between the joint heads and protect the pipeline. After the jacking is completed, the connection of the pipe joints is shown in Figure 4. The high-build type anti-corrosion coating adopts existing coatings, which will not be repeated here.

To sum up, the present invention is developed for the needs of curved pipe jacking of steel pipes, and has the characteristics of simple structure, compact layout, convenient construction and firm structure. It paves the way for the application of steel pipes in the field of curved pipe jacking, and can also be used as a relay room for steel pipe jacking.

Claims (3)

1. An assembled curved steel pipe jacking joint head is characterized in that one end of the steel pipe jacking joint is provided with a socket, and a grouting hole and a water-stop rubber ring groove are reserved on the socket, and the other end of the steel pipe jacking joint is provided with a socket. There are sockets, and the corresponding sockets and sockets of the two steel pipe jacking joints form a pair of joint heads. The ends of the sockets and the sockets are respectively provided with stiffening rings, and the rear of the stiffening rings is provided with longitudinal stiffening inner plates. The longitudinal stiffening inner panels at the mouth end and the socket end are respectively installed with detachable fixing plates, and the assembled force transmission top plate is placed between the socket and socket detachable fixing plates of two adjacent steel pipe joints, and the detachable fixing plate at the socket end It is connected with the assembled force transmission top plate by bolts, and the assembled force transmission top plate is connected with the detachable fixed plate at the socket end by bolts. 2. The curved steel pipe jacking joint according to claim 1, characterized in that a wooden spacer is arranged between the assembled force transmission top plate and the detachable fixed plate. 3. The curved steel pipe jacking joint according to claim 2, characterized in that a jack is installed between the socket end and the detachable fixing plate at the socket end.