CN209909302U - Mechanical jacking transition pipe for large-diameter K2 type nodular cast iron pipe - Google Patents

Mechanical jacking transition pipe for large-diameter K2 type nodular cast iron pipe Download PDF

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Publication number
CN209909302U
CN209909302U CN201920696934.1U CN201920696934U CN209909302U CN 209909302 U CN209909302 U CN 209909302U CN 201920696934 U CN201920696934 U CN 201920696934U CN 209909302 U CN209909302 U CN 209909302U
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pipe
socket
jacking
transition pipe
diameter
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Inventor
张建
王小征
赵磊
赵志峰
谭宝山
王天翼
李明超
葛凤凯
苏艳朝
王占鹏
吴强
任超
董伟龙
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BEIJING XIANGKUN WATER CONSERVANCY PROJECT Co Ltd
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BEIJING XIANGKUN WATER CONSERVANCY PROJECT Co Ltd
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Abstract

The utility model provides a major diameter K2 type nodular cast-iron pipe machinery pushes up transition pipe, including socket end, buffer segment and socket end, the buffer segment extends into the socket end to one side, extends into the socket end to the opposite side, through socket end and socket end, the one end of transition pipe is the socket form and the aircraft nose end connection of T type interface, and the other end is the socket form and the K2 type nodular cast-iron pipe socket connection of K2 type interface. The utility model enables the all-steel transition pipe to well connect the mechanical pipe jacking machine head with the nodular cast iron pipe of the K2 type interface, and the jacking of the nodular cast iron pipe of the type is smoothly carried out; the length of the all-steel transition pipe is 0.89m, the self weight is light, and when the deviation occurs in jacking, the deviation rectification of the machine head is easy.

Description

Mechanical jacking transition pipe for large-diameter K2 type nodular cast iron pipe
Technical Field
The utility model relates to a construction push pipe especially relates to a major diameter K2 type nodular cast iron pipe machinery jacking transition pipe and mounting method thereof.
Background
The pipe-jacking construction technology belongs to a relatively mature construction process, common pipe jacking materials at present are steel pipes and concrete pipes, and the pipe jacking construction technology is mentioned in the pipe-jacking construction specification.
The nodular cast iron pipe is the most common pipe in a water transmission pipeline, the DN2400 large-diameter nodular cast iron pipe with a K2 type interface is used in the Daxing branch line two-standard of the matching project of the south-to-north water diversion at present, the large-diameter nodular cast iron pipe is firstly applied to mechanical pipe jacking construction in China, and a pipe jacking joint matched with the K2 type interface does not exist at present.
The content of the prior art scheme is as follows:
when the nodular cast iron pipe with the traditional T-shaped socket joint is mechanically jacked, the tail part of the machine head of the mechanical jacking pipe is a socket with a concave-convex structure, the socket is matched with the socket of the traditional T-shaped nodular cast iron pipe, a rubber ring is matched with the concave-convex structure of the socket before jacking, the rubber ring is attached in the socket before jacking, then the socket of the nodular cast iron pipe is inserted, and the jacking machine head is connected with the nodular cast iron pipe and sealed by extruding the rubber ring.
The construction process in the pipe jacking comprises the following steps:
working well construction → pipe jacking equipment installation → pipe jacking machine hoisting in place → laser theodolite installation → pipe jacking machine goes out of the working well → first nodular cast iron pipe installation → normal jacking → pipe jacking machine goes into receiving well → interface is suppressed.
1. Working well construction
The jacking well and the receiving well adopt a vertical well form, have firm and firm structures, can resist soil pressure in all directions, have sufficient sizes to accommodate necessary equipment and operating space, and have lengths to accommodate single-section pipe length and pipe jacking equipment.
2. The pipe jacking equipment mainly comprises: the method comprises the following steps of installing the pipe jacking equipment according to a plan, wherein the equipment comprises a back wall, a hydraulic jack, a guide rail, a jacking iron, a mud inlet pipe, a mud discharge pipe, a mud jacking pipe, a power supply facility, a pipe jacking machine and the like.
3. The roof pipe is installed by a traditional nodular cast iron pipe:
the inside of the socket, the outside of the socket and the position for placing the sealing rubber ring are cleaned, and no residue is left.
And secondly, the sealing ring is bent into a cross shape or other shapes during installation. After the sealing ring is placed in the sealing groove, radial force is applied to completely place the sealing ring in the sealing groove, and whether the sealing ring is matched with the sealing groove is checked. And lubricating the socket rubber ring and the socket sealing part by using a special lubricant.
Thirdly, the pipe jacking is hung on the track in the working pit lightly, and when the pipe ditch is put down, the local part of the pipe body is prevented from colliding with the side surface and the bottom of the pit strongly. During jacking, the jack faces the soil layer direction, the socket faces the jacking direction, and the jack is forbidden to directly push the socket.
Fourthly, in order to prevent the steel ring of the socket from directly contacting with the end face of the socket and damaging the anticorrosive layer and the joint of the jacking pipe, in the jacking process, a cork liner is clamped between the front pipe section and the rear pipe section to even the acting force between the pipe sections and reduce the damage of the joint, and the cork liner is made of a plurality of layers of plywood with the thickness of 10mm generally.
4. Lubrication grouting
The increase of the jacking force not only affects the quality of the nodular cast iron pipe and the back wall of the working well, but also can be poured with lubricant to reduce the jacking force, and the lubricant is poured to the outer side of the pipe through the pouring holes of the T-shaped nodular cast iron pipe.
5. Interface pressure test
After the pipeline is installed, the joint is pressed to check the tightness of the joint. The joint is pressurized by a calibrated special pressurizing pump, water is pressurized from a water inlet hole at the lower part of the joint, and exhaust is carried out from an exhaust hole at the upper part; and after the exhaust is finished, the bolt is screwed. Pressurizing to working pressure according to the specified requirements, and then stabilizing the pressure.
The first prior art has the following disadvantages:
the length of a common nodular cast iron pipe is long, a single nodular cast iron pipe is about 6m, when a traditional T-shaped connector is directly connected with a jacking machine head and unknown deviation occurs in the jacking process, the machine head is difficult to drive a first nodular cast iron pipe, and the deviation rectifying difficulty is large.
SUMMERY OF THE UTILITY MODEL
The utility model provides a major diameter K2 type nodular cast-iron pipe machinery pushes up transition pipe has solved the problem that push bench easily takes place the skew when being connected with K2 type nodular cast-iron pipe through increasing the transition pipe, and its technical scheme is as follows:
a mechanical pushing-in transition pipe for the large-diameter K2-type nodular cast iron pipe is composed of a socket end, a buffer segment extended to one side to become a socket end and a socket end extended to another side, and through said socket end and socket end, one end of the transition pipe is in the form of T-type socket and connected to tail of machine head, and another end is in the form of K2 socket and connected to K2-type nodular cast iron pipe socket.
The transition pipe is processed by Q235C all steel, and the length is 890 mm; the length of the socket end is 370mm, the thickness is 48mm, and the diameter of a circle from the central axis of the transition pipe to the inner side of the socket end is 2434 mm; the length of the female end is 320mm, the thickness of the outer end is larger than that of the inner end, the thickness difference is 81.49mm, and the diameter of a circle from the central axis of the transition pipe to the outer side of the female end is 2720 mm.
The length of the buffer section is 200mm, two rib plates are arranged on the buffer section towards the inner side of the pipe, the thickness of each rib plate is 30mm, and the distance between the rib plates is 140 mm; and a circle of steel bar plates with the thickness of 25mm and the interval of 160mm are uniformly arranged around the circumference of the position between the rib plates, and the number of the steel bar plates is 53.
The socket end is provided with two grooves for matching with a pipe jacking machine head bell mouth.
The utility model has the advantages of it is following:
1. the all-steel transition pipe enables the mechanical pipe jacking machine head to be well connected with the nodular cast iron pipe of the K2 type interface, and jacking the nodular cast iron pipe of the type can be smoothly carried out;
2. the length of the all-steel transition pipe is 0.89m, the self weight is light, and when the deviation occurs in jacking, the deviation rectification of the machine head is easy.
Drawings
FIG. 1 is a schematic view of the matching of a socket of a mechanical jacking machine head and a socket of a nodular cast iron pipe of K2 type;
FIG. 2 is a schematic cross-sectional view of an all-steel transition duct;
FIG. 3 is a schematic of a fit using an all steel transition pipe;
fig. 4 is a dimensioning diagram of fig. 2.
Detailed Description
As shown in fig. 1, the tail interface of the existing mechanical jacking pipe is a socket end in a form of a T-shaped socket interface, and the K2 type nodular cast iron pipe interface adopted in the project cannot be directly connected with the tail structure of the jacking machine head in a different way. The K2 type socket joint has the structural form shown in the figure, and the joint seal depends on the components such as the rubber ring 1, the combined ring 2, the pressing ring 3 and the like in the joint. During installation, the socket 100 of the K2 type ductile iron pipe is inserted into the socket 200 of the mechanical jacking machine head, then the rubber ring 1 is placed into a gap between the outer wall of the socket 100 and the inner wall of the socket 200 in the pipe, the outer side of the rubber ring 1 is abutted against the seal of the socket 200, the inner side of the rubber ring 1 is abutted against the combined ring 2, the inner side of the combined ring 2 is abutted against the pressing ring 3, and the outer side of the pressing ring 3 is abutted against the radial wall surface of the flaring section of the socket 200 through the locking bolt 4 and the backing bar 5, so that the sealing effect is achieved.
The outer side of the socket 200 is covered with a cement protective layer 6, and the outer side of the mechanical jacking machine head is provided with a flange 11 matched with the outer end of the socket 200.
In order to connect the mechanical top-level head with the K2 type nodular cast iron pipe, a transition pipe 300 communicating the top pipe head with the K2 type nodular cast iron pipe is designed according to the structural form of the K2 type bell mouth and the structural form of the head tail.
As shown in fig. 2, the transition pipe 300 is formed by processing Q235C all steel, the transition pipe 300 includes a socket end 21, a buffer section 22 and a female end 20, the buffer section 22 extends to one side to form the socket end 21, and extends to the other side to form the female end 20. The length of the transition pipe 300 is 890mm, wherein the length of the socket end 21 is 370mm, the thickness is 48mm, and the diameter of the circle from the central axis of the transition pipe to the inner side of the socket end 21 is 2434 mm; the length of the female end 20 is 320mm, the thickness of the outer end is greater than that of the inner end, the thickness difference is 81.49mm, and the diameter of the circle from the central axis of the transition pipe to the outer side of the female end 20 is 2720 mm.
Thus, one end of the transition pipe 300 is connected with the tail part of the machine head in a socket mode of a T-shaped interface through the socket end 21 and the socket end 20, and the other end of the transition pipe is connected with a socket of a K2 nodular cast iron pipe in a socket mode of a K2 interface.
The length of the buffer section 22 is 200mm, in order to enhance the strength of the transition pipe, two ribs 24 are arranged on the buffer section 22 in the middle part towards the inner side of the pipe, the thickness of each rib is 30mm, and the distance between the ribs is 140 mm. The circumference that is located between the floor encircles a circle, evenly is provided with the reinforcing bar board 23 of thickness 25mm, interval 160mm, and reinforcing bar board 23 is 53.
Further, two grooves are formed in the socket end 21, and are used for being matched with a socket of the pipe jacking machine head in a sealing mode after the sealing rings 7 are placed respectively.
The transition pipe 300 is connected with a jacking machine head and a nodular cast iron pipe of K2 type in a manner shown in figure 3. When the installation is carried out, the construction process of mechanically jacking the K2 type nodular cast iron pipe is as follows:
measuring and leading points → working well construction → measuring and lofting → installing equipment such as an underground guide rail frame, a hydraulic system and a water stop ring → installing auxiliary facilities on the ground → hoisting and positioning a pipe jacking machine head connected with a transition pipe → installing a laser theodolite → exiting the working well of the pipe jacking machine → connecting the transition section with a first K2 type nodular cast iron pipe → normally jacking → entering and receiving wells of the pipe jacking machine → pressing an interface.
The pipe jacking working well is generally of a vertical shaft structure, adopts an inverted hanging mode for construction, belongs to a mature process, and needs to be noted that the net size of the vertical shaft needs to be designed to meet the construction requirement. And after the shaft is finished, pouring a back wall, discharging the elevation and the contour line of the jacking pipe according to the measuring leading point, chiseling the shaft wall in advance, and installing a water stop ring.
The preparation work in the earlier stage is completed, and the matched equipment of the mud-water balance push bench is arranged and installed according to the field condition, and mainly comprises a mud treatment system: the device comprises a mud pit, 1 adjusting tank, 1 stirring tank, 1 mud storage barrel, a mud feeding and discharging pipeline, a mud feeding and discharging pump, a shaft bypass and the like. Secondly, main jacking equipment: oil cylinder (according to the situation of the jacking force in site construction), pump station, track, integral back rest of the track, O-shaped jacking iron, horseshoe-shaped jacking iron and the like. Thirdly, the nose part: the core of the device is composed of the following parts: the device comprises a shell, a cutter head, a deviation correcting system, a speed changer, an image system and the like.
In order to ensure that the jacking axis is controlled within the allowable deviation range of the design axis, the deviation of a laser point emitted by the laser theodolite is closely paid attention during jacking. And the control system for axis measurement is arranged in the middle of the hydraulic main jacking device in the working well. The control console is frequently retested in construction to ensure the measurement precision, and the control console foundation is fixed on the vertical bottom plate by pouring concrete. And (4) after lofting according to the independent coordinate system, precisely moving the coordinate system to the axis of the jacking pipe by using the measurement control platform, and correctly commanding the construction direction of the jacking pipe.
The transition pipe is processed in a factory according to a design drawing and then transported to the site to be connected with the jacking machine head, the rubber ring is attached to the groove at the socket of the transition pipe, then the transition pipe is butted with the tail part of the machine head by adopting a crane, and then the transition pipe is inserted into the head part and the tail part of the pipe jacking machine through a chain block until a rib plate of the transition pipe is tightly abutted.
And after all preparations are finished, hoisting the machine head rigidly connected with the all-steel transition section into the well by using a crane, connecting each system, and performing online test operation.
After the online trial operation is normal, the main jacking oil cylinder slowly pushes the machine head through the water stopping device until the cutter head is in contact with the soil body to start all devices of a mud-water system to sequentially carry out pit bypass circulation, in-pipe bypass circulation and mud-water cabin circulation on mud so that the pressure reaches a designed value, the cutter head rotation button is started to rotate the soil body, then the main jacking pump station motor is started to extend the main jacking oil cylinder, the torque of the cutter head is increased from small to small, and the flow knob of the pump of the main jacking pump station and the flow of the mud-water system mud are adjusted at any time according to the torque of the cutter head so that the torque of the cutter head is kept within a rated range during jacking. When the soil layer is jacked in, the motor provides energy to rotate the cutting cutter disc, and the soil layer enters through the cutting cutter disc. The excavated soil is crushed in the rotating cutter head, then enters the mud tank, is mixed with mud therein, and finally is conveyed to the ground by the mud pump through the mud discharge pipe of the mud system. In the excavation process, a complex mud-water balance device is adopted to maintain water and soil balance so as to be always between active soil pressure and passive soil pressure, and the effect of eliminating the settlement and the uplift of the ground is achieved. When the jacking iron is jacked for a length, one jacking iron is added continuously, the jacking process is repeated until the tail of the machine head reaches the position of the continuous pipe, and an operator can master the deviation rectifying trend at any time according to the light spot of the laser direction indicator and the indication of the inclinometer.
After the push bench completely enters the soil layer, the cable and the slurry pipe are dismantled, and then the cable and the slurry pipe are hung into the first section of jacking nodular cast iron pipe and connected with the transition pipe. Inserting the spigot section of the K2 type large-diameter ductile cast iron pipe into a socket of all-steel transition, abutting against a spigot flange, and then installing components such as a rubber ring, a combined ring, a pressing ring and the like in the pipe. The top force point of jacking in-process kneck is the flange and the female end contact department of socket, and the unit mount does not receive the jacking influence in theory, has a problem in the jacking: whether the internal components are installed before jacking or after jacking. In order to ensure the smooth installation of the components, the internal components are finally installed and then pushed in, and the installation steps are as follows:
preparation before installation → pipeline in place → bell and spigot cleaning and oil brushing → pipe orifice butting → rubber ring installation → combined ring installation → pressing ring installation → mounting pad rod → completion of jacking → airtightness inspection → locking bolt.
Before the large-diameter ball-milling cast iron pipe orifices of the K2 type bell and spigot are butted, a working surface on the outer side of the spigot and a working surface of the socket are completely cleaned by a dry and clean brush or rag. After the cleaning, a layer of lubricant is coated in the range of the working surface of the spigot-and-socket joint, and the coated surface is kept free from foreign matter adhesion before the assembly is installed.
After the butt joint of the pipe spigot-and-socket joint is finished, the pipe enters the pipeline and is internally provided with components such as a rubber ring and the like. After the limiting block is taken out, the innermost rubber ring is firstly installed, the rubber ring is O-shaped, and is directly placed into the bell and spigot gap after being simply stretched, and is pressed to the bottom by hand.
And secondly, mounting a combined ring, wherein the combined ring consists of three sections, assembling the combined ring in a reserved space with the space of 115mm, mounting the lower combined ring, mounting the left combined ring and the right combined ring in sequence, and finally, putting a cushion block after a crowbar to push the gap of the combined ring in order to leave enough space for mounting the pressing ring.
And finally, mounting a pressing ring, wherein the pressing ring is divided into four sections, the pressing ring with the shortest bottom lower section and two end notches which are vertical planes is firstly arranged on the combined ring, then the pressing ring with the left side notch and the right side notch which are flat and inclined planes is mounted, the flat end is aligned with the lower part, the inclined end is aligned with the inclined plane of the uppermost pressing ring which is finally mounted, the pressing ring is manually supported, and the pressing ring can be released after the connecting piece is locked with the connecting bolt. After the pressing ring is placed, most of bolt caps on the circumference of the pressing ring are jacked to the end of a straight pipe of a bell mouth, a crowbar is firstly used, then a cushion block is placed to pry the pressing ring, a certain space is reserved for placing a thin hydraulic jack, finally two jacks are used for symmetrically pushing the pressing ring section by section, the pressing ring can be plugged into the rear portion of the bolt cap until a cushion rod can be plugged into the rear portion of the bolt cap, a bolt is withdrawn by hand, and the cushion rod is tightly pushed. In order to ensure the flexibility of the joint, the primary bolt does not need to be directly locked, and secondary locking is carried out after all pipelines are jacked.
And after the first section of the K2 type nodular cast iron pipe is installed, starting the jacking system, continuing jacking according to a machine head jacking program, and repeating the process continuously until all pipelines are jacked into the soil layer to finish a permanent underground pipeline. In the jacking process, in order to reduce the friction between the pipe wall and the soil body, three grouting holes are formed in each section of pipeline, and bentonite thixotropic slurry is injected. Meanwhile, measurement and jacking records are well made, and in addition, adverse factor monitoring is carried out at any time.
When the machine is mechanically jacked, deviation occurs when the machine head is jacked due to factors such as geological unevenness, the K2 type nodular cast iron pipe joint is a flexible joint, a certain adjusting space is provided, and each joint is allowed to deflect by 0.6 degrees. During jacking, an operator needs to pay attention to the laser target at any time, when axis deviation occurs, the deviation is timely corrected through the jack at the head, the deviation is frequently corrected, the deviation correction amount is small every time two times, and the deviation correction is timely performed three times, so that a large amount of deviation is avoided, and the K2 type large-diameter nodular cast iron pipe joint is not tightly installed.
And after the jacking pipeline is communicated and the bolt is locked again, an interface pressing test needs to be carried out. Before pressing, impurities in and around the interface are cleaned and kept clean. After the pressing equipment is moved to the pipeline joint, the center of the pressing equipment is slowly adjusted to be aligned with the center of the joint, then bolts within the circumferential range are gradually screwed in, the bolts are symmetrically screwed in and synchronously screwed in, and the extrusion plate can drive the rubber ring to be uniformly ejected to the pipe orifice. The rubber ring is required to completely cover the interface, the uncovered part needs to move the pressing equipment again to ensure that the interface is completely sealed, and finally the bolt is screwed to close the interface. And then the pressurizing pump and the water injection pump are connected with pressurizing equipment, water is injected into the joint closed space from the water injection hole by the water injection pump, air is exhausted by loosening the exhaust hole bolt at the upper part until the injected water is sprayed out of the exhaust hole, and then the exhaust hole is screwed down. And finally, manually pressurizing to the working pressure and keeping the pressure for a period of time.
The all-steel transition pipe provided by the utility model enables the jacking machine head to be effectively connected with the nodular cast iron pipe of the K2 type interface, thereby smoothly jacking the K2 type nodular cast iron pipe; the length of the all-steel transition pipe is 0.89m, the weight of the all-steel transition pipe is light, and when the head deflects during jacking, the head can be corrected easily.

Claims (7)

1. A major diameter K2 type nodular cast iron pipe machinery pushes up transition pipe, its characterized in that: the transition pipe comprises a socket end, a buffer section and a socket end, wherein the buffer section extends to one side to form the socket end, extends to the other side to form the socket end, one end of the transition pipe is connected with the tail part of the machine head in a socket mode of a T-shaped interface through the socket end and the socket end, and the other end of the transition pipe is connected with a socket of a K2 nodular cast iron pipe in a socket mode of a K2 interface.
2. The large-diameter K2-type ductile iron pipe mechanical jacking transition pipe as claimed in claim 1, wherein: the transition pipe is processed by Q235C all steel and has the length of 890 mm.
3. The large-diameter K2-type ductile iron pipe mechanical jacking transition pipe as claimed in claim 1, wherein: the length of the socket end is 370mm, the thickness is 48mm, and the diameter of the circle from the central axis of the transition pipe to the inner side of the socket end is 2434 mm.
4. The large-diameter K2-type ductile iron pipe mechanical jacking transition pipe as claimed in claim 1, wherein: the length of the female end is 320mm, the thickness of the outer end is larger than that of the inner end, the thickness difference is 81.49mm, and the diameter of a circle from the central axis of the transition pipe to the outer side of the female end is 2720 mm.
5. The large-diameter K2-type ductile iron pipe mechanical jacking transition pipe as claimed in claim 1, wherein: the length of the buffer section is 200mm, two rib plates are arranged on the buffer section towards the inner side of the pipe, the thickness of each rib plate is 30mm, and the distance between the rib plates is 140 mm.
6. The large-diameter K2-type ductile iron pipe mechanical jacking transition pipe of claim 5, wherein: and a circle of steel bar plates with the thickness of 25mm and the interval of 160mm are uniformly arranged around the circumference of the position between the rib plates, and the number of the steel bar plates is 53.
7. The mechanical jacking transition pipe for the large-diameter K2-type ductile cast iron pipe according to claim 3, wherein: the socket end is provided with two grooves for matching with a pipe jacking machine head bell mouth.
CN201920696934.1U 2019-05-15 2019-05-15 Mechanical jacking transition pipe for large-diameter K2 type nodular cast iron pipe Active CN209909302U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110043713A (en) * 2019-05-15 2019-07-23 北京翔鲲水务建设有限公司 Major diameter K2 type ductile iron pipe machinery jacking coupling tube and its installation method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110043713A (en) * 2019-05-15 2019-07-23 北京翔鲲水务建设有限公司 Major diameter K2 type ductile iron pipe machinery jacking coupling tube and its installation method

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