CN111425664A - Large-diameter concrete pipeline jacking pipe construction method - Google Patents
Large-diameter concrete pipeline jacking pipe construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 239000002689 soil Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 21
- 238000004140 cleaning Methods 0.000 claims description 10
- 210000000078 claw Anatomy 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 230000005641 tunneling Effects 0.000 abstract description 20
- 239000002002 slurry Substances 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
- F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
- F16L1/10—Accessories therefor, e.g. anchors for aligning
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- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a large-diameter concrete pipeline jacking pipe construction method, which combines the traditional manual jacking pipe tunneling mode with the slurry balance mechanical jacking pipe tunneling mode, and realizes smooth jacking of a pipeline by alternately working a second jacking device in a mechanical front guide steel casing at the jacking front end of the pipeline and a first jacking device on an assembled back wall at the rear end of the pipeline.
Description
Technical Field
The invention belongs to the technical field of concrete pipeline tunneling construction, and particularly relates to a large-diameter concrete pipeline jacking pipe construction method.
Background
The concrete pipe jacking construction is that firstly a working well is excavated, then a section of pipeline is lowered through the working well, and the lowered pipeline is jacked into a soil layer. The method is not directly jacked, and generally, after a hole is drilled by a machine head, the hole is drilled while jacking.
At present, in the process of pipeline tunneling, two modes of manual pipe jacking and mechanical pipe jacking are mainly adopted, and the problems of obvious regional difference, uneven level, lack of normative management and the like exist, and further optimization is needed. The existing pipeline excavation mainly depends on manual pipe jacking, the excavation speed is slow, and great safety risks exist, so that direct economic loss is caused, and even safety accidents are caused. With the progress of society and the development of technology, mechanical jacking pipes slowly enter the sight of people, the tunneling speed is greatly improved, and the safety in the construction process is improved, but the mechanical jacking pipes have the problem of high cost, and some small and medium-sized projects can only be overlooked, so that the wide application cannot be realized.
Disclosure of Invention
In view of the above, the present invention needs to provide a large-diameter concrete pipeline pipe-jacking construction method, which combines the traditional manual pipe-jacking tunneling mode with the slurry balance mechanical pipe-jacking tunneling mode, adopts a semi-manual and semi-mechanical tunneling mode, and optimizes the control of the pipeline axis direction, the unearthing mode, and the like, so as to ensure the safety of the workers in the tunneling process, improve the tunneling efficiency, control the cost of the construction process, and solve the technical problem that the existing pipeline pipe-jacking construction cannot give consideration to low cost, high efficiency and safety.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large-caliber concrete pipeline jacking pipe construction method comprises the following steps:
s1, measuring and positioning the jacking direction and height of the pipeline;
s2, installing an assembled back wall in the working well, and installing a plurality of first jacking devices on the assembled back wall;
s3, installing a mechanical front guide steel casing at the foremost end of the jacking direction of the pipeline, wherein a plurality of second jacking devices are arranged on the inner wall of the mechanical front guide steel casing, and the piston column movement direction of the second jacking devices is opposite to that of the first jacking devices;
s4, hanging down a lowering pipeline, so that the lowering pipeline is tightly attached to the finished pipeline and the first jacking device respectively;
s5, starting the first jacking equipment, and closing the first jacking equipment after the first jacking equipment, the lowering pipeline, the finished pipeline and the mechanical guide steel casing are tightly attached;
s6, opening the second jacking equipment, closing the second jacking equipment after the mechanical front guide steel pile casing jacks into the soil layer by a designed distance L, and cleaning soil on the tunnel face;
s7, after the soil body is cleaned, starting the first jacking device, jacking the pipeline for a designed distance L, and then closing the first jacking device;
s8, repeating the steps S4-S7 until all pipelines are smoothly pushed;
and in the construction process of the steps S2-S8, the mechanical front guide steel pile casing, the finished pipeline and the lowered pipeline are always kept consistent with the axis of the jacking direction of the pipeline, and the jacking direction of the pipeline is corrected by adjusting the jacking direction of the mechanical front guide steel pile casing.
Furthermore, the first jacking equipment and the second jacking equipment are both mechanical oil jacks, and the arrangement of the mechanical oil jacks is determined according to the pipe diameters of the pipelines, so that the mechanical oil jacks the end parts of the pipelines and are arranged in an array manner.
Preferably, the number of the first jacking equipment and the number of the second jacking equipment are four, and the first jacking equipment and the second jacking equipment are all hydraulic jacks.
Further, the force application center height of the first jacking device is not less than one third of the height of the assembled back wall.
Furthermore, a first motor for controlling the first jacking equipment is arranged on the assembled back wall, and a second motor for controlling the second jacking equipment is arranged on the inner wall of the mechanical front guide steel casing.
Preferably, the maximum power of the first motor and the maximum power of the second motor are both 15 kw.
Further, the inner wall that a section of thick bamboo was protected to preceding steel before machinery still is equipped with rather than coaxial hoop steel sheet of putting more energy into, hoop steel sheet of putting more energy into is located just protects the one end that the section of thick bamboo kept away from the tunnel face before machinery, just offer on the hoop steel sheet of putting more energy into and be used for the through-hole that the piston post of second jacking equipment passed.
Further, the design distance L is 50 cm.
Further, in step S6, the concrete step of cleaning the soil on the tunnel face is: and after digging out the soil body on the tunnel face by adopting a crawler-type vertical claw loader, conveying the soil body to a soil hopper by utilizing a traction trolley, and then hoisting the soil residues in the soil hopper by utilizing a gantry crane.
Further, the concrete steps of rectifying the jacking direction of the pipeline are as follows: and finding the intersection point of the pipeline axis and the assembled back wall as a fixed point on the assembled back wall, positioning by using a laser level meter, then changing the jacking direction of the mechanical front guide steel casing by adjusting the jacking stroke of the second jacking equipment, controlling the jacking direction of the pipeline and ensuring that the pipeline is straight.
Compared with the prior art, the invention has the following beneficial effects:
the construction method combines the traditional manual pipe-jacking tunneling mode with the slurry balance mechanical pipe-jacking tunneling mode, integrates the advantages of the two modes, adopts the semi-manual and semi-mechanical tunneling mode, and achieves the effects of saving cost and shortening construction period while ensuring safety.
In the tunneling process of the construction method, the mechanical front guide steel casing is jacked into soft and weak surrounding rocks on the tunnel face by using the second jacking equipment on the mechanical front guide steel casing at the foremost end of the pipeline, so that the surrounding rocks near the tunnel face are protected by using the steel casing in advance, the tunnel face is prevented from continuously collapsing, and then mechanical excavation operation is adopted, so that the tunneling safety is effectively ensured, and the tunneling speed can be increased.
In addition, according to the invention, the jacking stroke of the second jacking equipment on the mechanical front guide steel casing is finely adjusted through laser positioning, so that the axis stroke of the whole pipeline and the axis stroke of the mechanical front guide steel casing are slightly changed, the jacking direction of the mechanical front guide steel casing is changed, the control on the axis of the pipeline is realized, the effective adjustment on the axis of the pipeline is realized, the jacking direction of the pipeline can be accurately controlled, and the pipeline is ensured to be straight.
In the unearthing process after soil body cleaning, the crawler-type vertical claw loader is adopted for excavating and is automatically transported to the traction trolley by the crawler, the traction trolley is transported to the working well and is matched with the gantry crane to hoist and unearth, and the construction efficiency is greatly improved.
Drawings
FIG. 1 is a construction state diagram of a preferred embodiment of the present invention;
fig. 2 is a schematic view of the internal structure of the mechanical pilot steel casing 40 in fig. 1.
In the figure: 10-a gantry crane, 20-an assembled back wall, 30-a first mechanical oil jack, 40-a mechanical front guide steel casing, 41-a circumferential stiffening steel plate, 50-a second mechanical oil jack, 51-a second motor, 70-a crawler type vertical claw loader, 80-a traction trolley and 90-a soil bucket.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention discloses a large-caliber concrete pipeline jacking pipe construction method, which comprises the following steps of:
s1, measuring and positioning the jacking direction and height of the pipeline;
s2, installing an assembled back wall in the working well, and installing a plurality of first jacking devices on the assembled back wall;
s3, installing a mechanical front guide steel casing at the foremost end of the jacking direction of the pipeline, wherein a plurality of second jacking devices are arranged on the inner wall of the mechanical front guide steel casing, and the piston column movement direction of the second jacking devices is opposite to that of the first jacking devices;
s4, hanging down a lowering pipeline, so that the lowering pipeline is tightly attached to the finished pipeline and the first jacking device respectively;
s5, starting the first jacking equipment, and closing the first jacking equipment after the first jacking equipment, the lowering pipeline, the finished pipeline and the mechanical guide steel casing are tightly attached;
s6, opening the second jacking equipment, closing the second jacking equipment after the mechanical front guide steel pile casing jacks into the soil layer by a designed distance L, and cleaning soil on the tunnel face;
s7, after the soil body is cleaned, starting the first jacking device, jacking the pipeline for a designed distance L, and then closing the first jacking device;
s8, repeating the steps S4-S7 until all pipelines are smoothly pushed;
and in the construction process of the steps S2-S8, the mechanical front guide steel pile casing, the finished pipeline and the lowered pipeline are always kept consistent with the axis of the jacking direction of the pipeline, and the jacking direction of the pipeline is corrected by adjusting the jacking direction of the mechanical front guide steel pile casing.
The invention mainly realizes the smooth jacking of the pipeline by the alternative work of the second jacking equipment in the mechanical front guide steel casing at the jacking front end of the pipeline and the first jacking equipment on the assembled back wall at the rear end of the pipeline, wherein the assembled back wall is prefabricated and is made of steel plates and concrete, and the assembly is a conventional installation mode in the field, so the detailed description is omitted. Before the construction method is used for construction, some preparation works in the previous stage are also included, for example, a working well is excavated after positioning, a gantry crane used for hoisting a downward pipeline is erected at a wellhead of the working well, and the like, which are conventional operations of construction in the field, so detailed description is omitted here, and in addition, it can be understood that the hoisting capacity of the gantry crane can be adjusted according to the site construction environment and design requirements, and therefore, specific limitation is not made here, and in some embodiments of the invention, the hoisting capacity of the gantry crane is 50 t.
Further, the first jacking device and the second jacking device mentioned in the construction method may adopt conventional jacking devices in the field, preferably, the first jacking device and the second jacking device are both mechanical oil jacks, the arrangement of the mechanical oil jacks is determined according to the pipe diameters of the pipes, the mechanical oil jacks are required to jack the ends of the pipes and are arranged in an array, that is, the mechanical oil jacks are required to jack the ends of the pipes in operation and are in close contact with the ends of the pipes, and in order to ensure the uniformity of stress, the mechanical oil jacks are arranged in an array, that is, the intervals between adjacent mechanical oil jacks are equal. Furthermore, the fixing means of the first jacking device and the second jacking device are also conventional in the art, and in some specific embodiments of the present invention, the fixing means of welding is adopted.
Furthermore, the number of the first jacking device and the number of the second jacking device are four, and all the first jacking device and the second jacking device are hydraulic jacks, wherein the specification of the hydraulic jacks is not particularly limited, and can be adjusted according to site construction and design requirements, and in some specific embodiments of the invention, the jacking force of the hydraulic jacks is 200 t.
Furthermore, the height of the force application center of the first jacking device is not less than one third of the height of the assembled back wall, which is mainly used for keeping the force application point consistent with the resultant point of passive soil behind the wall, thereby reducing the inclination of the assembled back wall.
It can be understood that the first jacking equipment and the second jacking equipment are controlled to be opened and closed through motors, in the construction method, the first motor for controlling the first jacking equipment is installed on the fabricated back wall, the second motor for controlling the second jacking equipment is arranged on the inner wall of the mechanical guide steel casing, and the specific position of the second motor is not limited as long as the pipe jacking process and other processes are not hindered. And the specification and model of the first motor and the second motor can be adjusted according to the site construction condition and design requirement, in some specific embodiments of the invention, the maximum power of the first motor and the second motor is 15 kw.
Further, the inner wall that a section of thick bamboo was protected to preceding steel before machinery still is equipped with rather than coaxial hoop steel sheet of putting more energy into, hoop steel sheet of putting more energy into is located just protects the one end that the section of thick bamboo kept away from the tunnel face before machinery, just offer on the hoop steel sheet of putting more energy into and be used for the through-hole that the piston post of second jacking equipment passed. The hoop stiffening steel plate plays a reinforced role to the preceding steel pile casing of machinery on the one hand, and on the other hand is hugged closely with the pipeline front end at pipeline jacking in-process to the area of contact of second jacking equipment and pipeline is increased, thereby effectively protects the pipeline integrity.
Further, the jacking distance of each time in the construction method can be designed according to the field construction condition, and in some specific embodiments of the invention, the design distance L is 50 cm.
Further, the mechanical front guide steel pile casing needs to excavate and clean the soil mass on the tunnel face once per jacking into the soil layer, the excavation and cleaning of the soil mass can be a conventional cleaning procedure in the field, and in the construction method, preferably, in step S6, the specific steps of cleaning the soil mass on the tunnel face are as follows: and after digging out the soil body on the tunnel face by adopting a crawler-type vertical claw loader, conveying the soil body to a soil hopper by utilizing a traction trolley, and then hoisting the soil residues in the soil hopper by utilizing a gantry crane. The crawler-type vertical claw loader is mainly used for tunneling a tunnel face and automatically discharging soil, the traction trolley is mainly used for loading soil and transporting the soil to a working well, the traction trolley is mainly driven by electric power to do linear reciprocating motion in a pipeline, then the soil in the traction trolley is transferred to an earth bucket, and finally the earth bucket is lifted out by using a gantry crane to clean earth slag. It can be understood that the crawler-type vertical claw loader, the traction trolley, the soil bucket and the like used herein are not limited to specific ones, as long as the same function can be realized, and the device for achieving the purpose of cleaning soil can be used in the construction method, and the specifications of the traction trolley and the soil bucket can be adjusted according to the design requirements, so that the specific limitations are not required, in some specific embodiments of the invention, the volume of the traction trolley is 0.6m3The capacity of the soil bucket is 1.5m3And a pair of hanging rings are arranged at the edge of the soil hopper and are symmetrically arranged relatively for facilitating the hoisting of the gantry crane.
Further, the jacking direction of the pipeline can be adjusted by adjusting the jacking stroke of the second jacking equipment on the mechanical front guide steel pile casing, the pipeline is ensured to be straight, and the method comprises the following specific steps: and finding the intersection point of the pipeline axis and the assembled back wall on the assembled back wall as a fixed point, positioning by using a laser level meter, then changing the jacking direction of the mechanical front guide steel casing by adjusting the jacking stroke of the second jacking equipment, controlling the jacking direction of the pipeline and ensuring that the pipeline is straight.
The technical scheme of the invention is further clearly and completely explained by combining the specific embodiments as follows:
the construction method in the embodiment is applied to D2800 pipe-jacking construction in pipeline engineering, wherein the length of a D2800 pipeline in the engineering is 900m, the burial depth is 9-12m, most of the pipeline at the section is in a powdery clay layer, soil particles are fine and smooth, the cohesive force is low, the numerical value of an internal friction angle is small, and the tunnel face collapse is serious in the normal tunneling process, so that great potential safety hazards are brought to the construction, therefore, the pipe-jacking construction method adopting the embodiment can be understood by combining with the figure 1, and specifically comprises the following steps:
s1, excavating a working well at a design place, erecting a gantry crane 10 with the hoisting capacity of 50t at the well mouth of the working well, performing accurate measurement by using the South Galaxy 6 RTK, and positioning the jacking direction and height of the pipeline;
s2, installing the assembled back wall 20 in a working well, installing 4 first mechanical oil jacks 30 on the assembled back wall 20, and simultaneously installing first motors for controlling the 4 first mechanical oil jacks 30, wherein the positions of the first mechanical oil jacks 30 are adjusted according to the pipe diameters of pipelines, so that the 4 first mechanical oil jacks 30 can be propped against ports of a descending pipeline and are distributed in an array mode around the pipe diameters, the array centers of the 4 first mechanical oil jacks 30 are adjusted to be consistent with the axis of the pipelines, and the force application center height of the first mechanical oil jacks 30 is not lower than one third of the height of the assembled back wall 20;
s3, installing a mechanical front guide steel casing 40 at the foremost end along the jacking direction of the pipeline, adjusting the axis of the mechanical front guide steel casing 40 to be consistent with the axis of the pipeline, welding 4 second mechanical oil tops 50 and a second motor 51 for controlling the second mechanical oil tops 50 on the inner wall of the mechanical front guide steel casing 40, and in addition, welding a circumferential stiffening steel plate 41 coaxial with the mechanical front guide steel casing 40 on the inner wall of the mechanical front guide steel casing 40, as shown in FIG. 2, welding the circumferential stiffening steel plate 41 on one end of the mechanical front guide steel casing 40 far away from the tunnel face, and arranging through holes for piston columns of the second mechanical oil tops 50 to pass through on the circumferential stiffening steel plate 41, wherein the motion direction of the piston columns of the second mechanical oil tops 50 is opposite to that of the first mechanical oil tops 30, the arrangement of the second mechanical oil tops 50 is similar to that of the first mechanical oil tops 30, and the second mechanical oil tops can prop against the front end of the pipeline and are arranged in an array around the pipe diameter, in the construction method, the first mechanical oil jack 30 and the second mechanical oil jack 50 both adopt hydraulic jacks with the maximum jacking force of 200 t;
s4, hoisting the lowering pipeline by using the gantry crane 10, enabling one end of the lowering pipeline to be tightly attached to the finished pipeline, enabling the other end of the lowering pipeline to be tightly attached to the 4 first mechanical oil tops 30, and adjusting the axis of the lowering pipeline to be consistent with the axis of the finished pipeline;
s5, opening the first mechanical oil cap 30, closing the first mechanical oil cap 30 after the first mechanical oil cap 30, the lowering pipeline, the completed pipeline (without the section if the lowering pipeline is pushed forward for the first time) and the mechanical front guide steel casing 40 are tightly attached, wherein the axes of the first mechanical oil cap 30, the lowering pipeline, the completed pipeline (without the section if the lowering pipeline is pushed forward for the first time) and the mechanical front guide steel casing 40 are always kept consistent in the process;
s6, opening the second mechanical oil top 50, enabling a piston column of the second mechanical oil top 50 to penetrate through a through hole in the annular stiffening steel plate 41 to prop against the end of the pipeline, enabling the mechanical front guide steel casing 40 to prop into the soil layer for 50cm, closing the second mechanical oil top 50, digging out soil on the tunnel face by adopting a crawler-type vertical claw loader 70 with the model of WDZ L60 (standard type), and then utilizing the volume of the crawler-type vertical claw loader 70 to be 0.6m3The traction trolley 80 transports the soil body out to the volume of 1.5m3The soil bucket 90 is lifted out by using the gantry crane 10;
s7, after the soil body is cleaned, opening the first mechanical oil top 30 again, jacking the pipeline by 50cm, and closing the first mechanical oil top 30;
s8, repeating the steps S4-S7 until all pipelines are smoothly pushed;
in the construction jacking process, the intersection point of the designed pipeline axis and the assembled back wall 20 is determined on the assembled back wall 20 to serve as a fixed point, the jacking direction is controlled by using a laser level meter in the jacking process, and when a deviation exists, the jacking stroke of 4 second mechanical oil jacks 50 is adjusted in time so as to effectively adjust the pipeline axis, the accurate control of the pipeline jacking direction is realized, and the pipeline is ensured to be straight.
By adopting the pipe-jacking construction method in the embodiment, the collapse phenomenon of surrounding rocks under unfavorable geological conditions can be effectively controlled, so that the safety of constructors in the tunneling process is ensured, and through comparison of different construction modes, the method can also achieve the effects of saving cost and shortening the construction period, as shown in the table 1:
TABLE 1 comparison of different construction modes
| Construction method | Traditional artificial pipe jacking | Mud-water balance mechanical jacking pipe | This example |
| Efficiency (m/day) | 1 | 7 | 2.5 |
| Equipment cost (Wan) | 5 | 100 | 16 |
| Risks | Easy collapse | Security | Security |
According to the embodiment and the comparison in the table 1, the pipe-jacking construction method improves the tunneling efficiency and the unearthing efficiency, thereby achieving the effect of improving the efficiency, optimizing the construction process and the machinery, greatly saving the economic cost on the premise of ensuring the safety and the quality, and the like, and having higher popularization and application values.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A large-caliber concrete pipeline jacking pipe construction method is characterized by comprising the following steps:
s1, measuring and positioning the jacking direction and height of the pipeline;
s2, installing an assembled back wall in the working well, and installing a plurality of first jacking devices on the assembled back wall;
s3, installing a mechanical front guide steel casing at the foremost end of the jacking direction of the pipeline, wherein a plurality of second jacking devices are arranged on the inner wall of the mechanical front guide steel casing, and the piston column movement direction of the second jacking devices is opposite to that of the first jacking devices;
s4, hanging down a lowering pipeline, so that the lowering pipeline is tightly attached to the finished pipeline and the first jacking device respectively;
s5, starting the first jacking equipment, and closing the first jacking equipment after the first jacking equipment, the lowering pipeline, the finished pipeline and the mechanical guide steel casing are tightly attached;
s6, opening the second jacking equipment, closing the second jacking equipment after the mechanical front guide steel pile casing jacks into the soil layer by a designed distance L, and cleaning soil on the tunnel face;
s7, after the soil body is cleaned, starting the first jacking device, jacking the pipeline for a designed distance L, and then closing the first jacking device;
s8, repeating the steps S4-S7 until all pipelines are smoothly pushed;
and in the construction process of the steps S2-S8, the mechanical front guide steel pile casing, the finished pipeline and the lowered pipeline are always kept consistent with the axis of the jacking direction of the pipeline, and the jacking direction of the pipeline is corrected by adjusting the jacking direction of the mechanical front guide steel pile casing.
2. The large-caliber concrete pipeline jacking pipe construction method according to claim 1, wherein the first jacking equipment and the second jacking equipment are both mechanical oil jacks, and the arrangement of the mechanical oil jacks is determined according to the pipe diameter of the pipeline, so that the mechanical oil jacks the end part of the pipeline and are arranged in an array.
3. The large-caliber concrete pipeline jacking pipe construction method according to claim 2, wherein the number of the first jacking equipment and the number of the second jacking equipment are four, and the first jacking equipment and the second jacking equipment are all hydraulic jacks.
4. The pipe jacking construction method for large-caliber concrete pipes according to claim 1, wherein the height of the center of force of the first jacking equipment is not less than one third of the height of the fabricated back wall.
5. The push pipe construction method for the large-caliber concrete pipeline as claimed in claim 1, wherein a first motor for controlling the first jacking equipment is provided on the fabricated back wall, and a second motor for controlling the second jacking equipment is provided on the inner wall of the mechanical front steel casing.
6. The large-caliber concrete pipeline jacking pipe construction method according to claim 5, wherein the maximum power of the first motor and the maximum power of the second motor are both 15 kw.
7. The large-caliber concrete pipeline jacking pipe construction method according to claim 1, wherein the inner wall of the mechanical front guide steel casing is further provided with a circumferential stiffening steel plate coaxial with the mechanical front guide steel casing, the circumferential stiffening steel plate is arranged at one end of the mechanical front guide steel casing far away from a tunnel face, and the circumferential stiffening steel plate is provided with a through hole for a piston column of the second jacking equipment to pass through.
8. The push pipe construction method of the large-caliber concrete pipeline as claimed in claim 1, wherein the design distance L is 50 cm.
9. The push pipe construction method for the large-caliber concrete pipeline as claimed in claim 1, wherein in step S6, the concrete step of cleaning the soil body of the tunnel face is: and after digging out the soil body on the tunnel face by adopting a crawler-type vertical claw loader, conveying the soil body to a soil hopper by utilizing a traction trolley, and then hoisting the soil residues in the soil hopper by utilizing a gantry crane.
10. The large-caliber concrete pipeline jacking pipe construction method according to claim 1, wherein the concrete steps of correcting the jacking direction of the pipeline are as follows: and finding the intersection point of the pipeline axis and the assembled back wall as a fixed point on the assembled back wall, positioning by using a laser level meter, then changing the jacking direction of the mechanical front guide steel casing by adjusting the jacking stroke of the second jacking equipment, controlling the jacking direction of the pipeline and ensuring that the pipeline is straight.
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Application publication date: 20200717 |