CN115012950A - Water-rich sand layer pipe jacking construction method close to subway - Google Patents

Abstract

The utility model relates to a technical field of push pipe construction, when being directed against traditional push pipe construction, the back is restoreed to the jacking equipment, the condition in the well is originated in easy withdrawal of installation pipeline and push pipe, a rich water sand bed push pipe construction method who closes on the subway is proposed, through be provided with the stopping sleeve on the location track, it has stopping rod and stopping to peg graft in the stopping sleeve and is provided with in the stopping sleeve and orders about the elastic component that the stopping rod stretches out outside the stopping sleeve to order about the stopping rod, when utilizing the jacking equipment to break away from the installation pipeline, the stopping rod stretches out and the butt is at the installation pipeline tip, it takes place to retract to have restricted installation pipeline and push bench. The pipe pushing device has the effect of timely limiting the pipe pushing machine and the retraction of the installed pipeline.

Description

Water-rich sand layer pipe jacking construction method close to subway

Technical Field

The application relates to the technical field of pipe jacking construction, in particular to a water-rich sand layer pipe jacking construction method close to a subway.

Background

Because engineering project construction needs usually need bury the pipeline underground above the subway tunnel, the pipeline is buried underground to the tradition, needs excavate the soil body on a large scale, causes the soil body around the subway tunnel easily and takes place the disturbance because of the uninstallation, leads to the subway tunnel of below to take place to warp, influences the normal use of subway tunnel, for reducing above-mentioned condition emergence, usually adopt the push pipe construction method that need not to excavate the soil body on a large scale at present to carry out laying of relevant pipeline.

In the existing pipe jacking construction process, after jacking equipment in an originating well jacks a section of pipeline into the earth, resetting is usually needed so that the next section of pipeline can be hung in the originating well, and because the installed pipeline and a pipe jacking machine lose load applied by the jacking equipment, the pressure right in front of the pipe jacking machine is greater than the friction force of the pipe jacking machine and the outer side of the installed pipeline, the pipe jacking machine and the installed pipeline can retract by 20-30 cm into the originating well, and along with retraction of the pipe jacking machine, earth mass collapses immediately in front of the head of the pipe jacking machine, so that settlement of a road surface and pipelines is caused, and the safety of road traffic and underground pipelines is seriously influenced.

In view of the above-described related art, the applicant believes that the following disadvantages exist: at present, the corresponding measures for the retraction of the pipe jacking machine and the pipeline after the resetting of the jacking equipment are usually to accelerate the speed of lowering the pipeline as much as possible so as to reduce the time that the pipe jacking machine and the installed pipeline lack the support of the jacking equipment and reduce the retraction amount of the pipeline as much as possible, but the retraction amount of the pipe jacking machine and the pipeline is still larger, so that an improvement space exists.

Disclosure of Invention

In order to reduce the phenomenon that a pipe jacking machine and an installed pipeline retract after jacking equipment resets in the pipe jacking construction process, the application provides a water-rich sand layer pipe jacking construction method close to a subway.

The application provides a water-rich sand layer pipe jacking construction method close to a subway, which adopts the following technical scheme:

a water-rich sand layer pipe jacking construction method close to a subway comprises the following steps:

the method comprises the following steps: carrying out tee joint leveling and measurement lofting on the construction area;

step two: pouring an originating well and a receiving well, wherein a through hole for a pipe jacking machine to drill into is reserved in the originating well;

step three: pipeline placement site construction and pipeline transportation: pouring a placing field of the pipeline, and transporting the pipeline to the placing field for placing;

step four: pouring a rear backup wall in the starting well, and installing a rear backup plate on the rear backup wall;

step five: a positioning track is arranged at the bottom of the starting shaft, and jacking equipment is arranged on the rear backup plate;

step six: installing a push bench: hoisting the pipe jacking machine into the positioning track;

step seven: starting the push bench, driving the push bench to penetrate through the through hole and drill into the soil layer through the jacking equipment, and then resetting the jacking equipment;

step eight: jacking the pipeline: hoisting the pipeline to a positioning track; jacking the pipe jacking machine and the pipeline into the soil layer through jacking equipment, and then resetting the jacking equipment;

step nine: repeating the step eight until the installation of all the pipelines is completed;

step ten: removing the pipe jacking machine and the jacking equipment, and backfilling an originating well and a receiving well;

the last vertical stopping sleeve that is provided with of location track, stopping sleeve slides and pegs graft and have the stopping pole, be provided with in the stopping sleeve and order about stopping pole top and stretch out the outer elastic component of stopping sleeve, stopping pole top is the inclined plane orientation back board of wedge form and stopping pole, works as when jacking equipment breaks away from the pipeline installation tip, stopping pole top stretch out outside the stopping sleeve and with the tip butt of pipeline installation.

By adopting the technical scheme, when the jacking equipment is separated from the installed pipeline for resetting, the retaining rod in the retaining sleeve extends out of the retaining sleeve under the driving of the elastic piece and is abutted against the end part of the installed pipeline, so that the limit of the installed pipeline is realized, the equalizing ring of the jacking equipment is favorably reduced after being separated from the installed pipeline, the retraction phenomenon of the pipe jacking machine and the installed pipeline ensures that the road surface is not easy to collapse due to the retraction of the pipe jacking machine and the installed pipeline, the retaining rod is in a wedge-shaped block shape, the inclined surface of the retaining rod faces the back wall, when the pipeline to be installed moves towards the end part of the installed pipeline under the driving of the jacking device, the installed pipeline and the grading ring are sequentially abutted against the inclined surface of the retaining rod, and then order to order about the stopping pole and withdraw to in the stopping sleeve, the pipeline of being convenient for to wait to install can realize the grafting cooperation with the pipeline of having installed under the drive of jacking equipment.

Preferably, the opposite sides of positioning track all erect the backup pad, the backup pad top all articulates there is the locating plate, locating plate axis of revolution direction is parallel with positioning track extending direction, the backup pad is provided with orders about locating plate wobbling main driving piece, and when two sets of locating plate in the backup pad all swung to the horizontality, two sets of locating plate was located directly over the positioning track and two sets of locating plate one end that is close to each other left the clearance.

Through adopting above-mentioned technical scheme, the back is resetd to the jacking equipment, order about corresponding locating plate swing to the horizontality through the main driving piece, hang the pipeline into in the well of starting and make the pipeline card go into the clearance between two sets of locating plates, alright make pipeline just right with the positioning track, locating plate downswing through the main driving piece drive correspondence, alright drive the pipeline and move towards the positioning track, go into to the positioning track in until the pipeline card, compare the mode of traditional hoist and mount pipeline, be favorable to reducing the condition that hoist and mount in-process pipeline emergence rocks and need artifical supplementary ajustment position, the pipeline of being convenient for can block to the positioning track fast more conveniently on, be favorable to promoting the efficiency of push pipe construction.

Preferably, when the jacking equipment is separated from the end part of the installed pipeline and the two groups of positioning plates swing and reset; one side of the positioning plate facing the installed pipeline is abutted against the end part of the installed pipeline.

By adopting the technical scheme, in the resetting process of the positioning plates, the positioning plates are abutted against the end parts of the installed pipelines towards one sides of the installed pipelines, so that the two groups of positioning plates and the retaining rods can limit the pipe pushing jack and the installed pipelines to retract together, and the installed pipelines can be more stably limited to rebound; meanwhile, the condition that the thrust rod is deformed and damaged due to the fact that loads of the push bench and the installed pipeline are concentrated and act on the thrust rod for a long time is favorably reduced, and the service life of the thrust rod is favorably prolonged.

Preferably, two groups of insertion grooves are formed in the bottom of the originating well and correspond to the two groups of supporting plates, the two groups of supporting plates are respectively inserted into the two groups of insertion grooves, abutting plates are erected on two opposite sides of the supporting plates, and auxiliary driving pieces for driving the abutting plates to abut against the wall of the originating well are further arranged on two opposite sides of the supporting plates.

By adopting the technical scheme, the supporting plate does not need to be integrally formed with the starting well, after the subsequent pipe jacking construction is completed, the supporting plate and the positioning plate can be detached, the supporting plate and the positioning plate can be recycled, the abutting plates are erected on two opposite sides of the supporting plate, and the abutting plates are driven to abut against the auxiliary driving piece of the starting well wall, so that on one hand, when the positioning plate abuts against the end part of the installed pipeline, the load of the installed pipeline acting on the positioning plate can be timely dispersed to the well wall of the starting well through the auxiliary driving piece and the abutting plates; another convenience orders about the butt joint board through accessory drive spare and the wall of a well butt of originating the well, realizes the support to originating the well wall of a well.

Preferably, the soil body outside the receiving well and on one side facing the originating well is embedded with a plurality of occlusive piles.

By adopting the technical scheme, the soil body on one side of the receiving well facing the originating well is reinforced by the secant pile, so that the situation that the road surface collapses due to the fact that the soil body outside the receiving well is greatly gushed into the receiving well through the gap between the pipe jacking well and the wall of the receiving well after the pipe jacking machine drills into the receiving well is favorably reduced.

Preferably, still erect the support track that supplies pipe jacking machine card to go into in the receiving well, the limiting plate is all erect at support track outside both ends, the support track still is provided with the limiting plate that orders about support track outside both ends and butts the drive assembly in the wall of a well of the relative both sides of receiving well respectively.

By adopting the technical scheme, the supporting rails are arranged, so that the push bench can be supported by the supporting rails after drilling into the receiving well, the push bench is guided, and the phenomenon of inclined knock head of the push bench is reduced. Order about support track both ends butt respectively in the wall of a well of receiving the relative both sides of well through drive assembly, realize spacing to supporting the track, make the difficult displacement that produces of support track, the limiting plate that still can support the track both ends simultaneously supports the wall of a well of receiving the relative both sides of well, be favorable to reducing when the push bench bores into the receiving well, the condition that the crack collapsed even appears in the wall of a well of receiving, the back is accomplished in the push pipe construction, accessible secondary drive spare orders about two sets of limiting plates and is close to each other, alright fall out the support track from the receiving well, realize supporting orbital reciprocating use.

Preferably, the starting well wall is further provided with a flexible sealing ring, the flexible sealing ring is arranged around the through hole, and the inner periphery of the flexible sealing ring is abutted to the outer periphery of the pipeline.

By adopting the technical scheme, through the arrangement of the flexible sealing ring, the gap between the pipeline and the perforation is favorably sealed by the flexible sealing ring, the situation that the soil outside the originating well enters the originating well through the gap between the pipeline and the perforation in the pipe jacking construction process is favorably reduced, and the originating well is not easy to accumulate gravel and waste soil.

Preferably, the positioning track comprises two sets of positioning rods which are erected in parallel, the stopping sleeve is positioned between the two sets of positioning rods, two opposite sides of the stopping sleeve are fixedly connected with connecting rods, and the two connecting rods are respectively connected to one opposite side of the two sets of positioning rods.

Through adopting above-mentioned technical scheme for the load that has exerted on stopping pole and stopping sleeve when the pipeline of having installed retreats can in time transmit to the positioning rail through the connecting rod on, makes stopping pole and stopping sleeve be difficult for taking place to warp.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the stopping sleeve is arranged through the positioning track, the stopping rod is inserted in the stopping sleeve in a sliding mode, the stopping sleeve is internally provided with a human elastic piece for driving the stopping rod to extend out of the stopping sleeve, when the jacking equipment is separated from the end portion of the installed pipeline, the stopping rod is ejected out and abutted against the end portion of the installed pipeline, the ejected stopping rod is used for limiting retraction of the installed pipeline, and the situation that a road surface collapses in the process of pipe jacking construction is reduced;

2. when the jacking equipment is separated from the end part of the installed pipeline and the positioning plate swings upwards to reset, the positioning plate abuts against the end part of the installed pipeline towards one side of the installed pipeline, the installed pipeline is limited to retract through the two groups of positioning plates and the retaining rods, and the installed pipeline is enabled to be less prone to retracting into the starting well.

Drawings

FIG. 1 is a schematic structural diagram for the pipe jacking construction of the present application.

Fig. 2 is a schematic structural diagram of the jacking device for jacking a pipeline.

Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a schematic structural diagram for illustrating the resetting of the positioning plate according to the present application.

Fig. 5 is an enlarged schematic view of a portion B in fig. 4.

Description of reference numerals:

1. an originating well; 11. positioning the track; 111. positioning a rod; 112. a support bar; 12. the back is against the wall; 121. a back backup plate; 13. inserting grooves; 14. a flexible sealing ring; 15. an annular plate; 2. a receiving well; 20. an occlusive pile; 21. a support rail; 211. a support; 212. a bidirectional oil cylinder; 213. a limiting plate; 3. jacking equipment; 31. a frame; 32. a jack; 33. a grading ring; 4. a pipe jacking machine; 41. a pipeline; 5. a support plate; 51. a secondary drive member; 52. a butt joint plate; 53. positioning a plate; 54. a primary drive member; 6. a backstop sleeve; 61. a backstop rod; 62. an elastic member; 63. a connecting rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a water-rich sand layer pipe jacking construction method close to a subway.

Referring to fig. 1 and 2, a water-rich sand layer pipe jacking construction method near a subway comprises the following steps:

the method comprises the following steps: and carrying out tee joint leveling and measurement lofting on the construction area.

Step two: and pouring an initial well 1 and a receiving well 2, wherein a through hole for a pipe jacking machine 4 to drill into is reserved in the initial well 1.

Step three: construction of a pipeline 41 placement site and transportation of the pipeline 41: and pouring the pipeline 41 placing field, and transporting the pipeline 41 to the placing field for placing.

The construction site is completely hardened by C30 concrete with the thickness of 30cm, so that the requirement of stacking pipeline bearing capacity is met. When the pipeline 41 is placed, a wooden pillow needs to be placed at the bottom of the pipeline 41 to prevent the concrete surface of the pipeline 41 from being damaged.

Step four: pouring a rear wall 12 in the starting well 1; and a rear backup plate 121 is installed on the rear backup wall 12; the back plate 121 consists of a 6000 x 500 steel box. The gap between the back plate 121 and the back wall 12 is filled with fine stone concrete.

Step five: a positioning rail 11 is installed at the bottom of the originating well 1, and a jacking device 3 is installed on the rear backup plate 121.

The positioning rail 11 is a steel structure prefabricated part, the positioning rail 11 is accurately lofted according to the design axis of the pipeline 41, and is hoisted into the starting well 1 to be installed and fixed in place in the well according to the baseline of measurement lofting during installation. The positioning track 11 is placed centrally according to the design axis of the jacking pipe and the center of the actual measurement perforation, and the positioning track 11 is guaranteed to be stable and not to deform in the using process.

Step six: installing a push bench 4: and hoisting the push bench 4 into the positioning track 11.

Step seven: and starting the push bench 4, driving the push bench 4 to penetrate through the perforation and drill into the soil layer through the jacking equipment 3, and then resetting the jacking equipment 3.

Step eight: jacking the pipeline 41: hoisting the pipeline 41 to the positioning track 11; the pipe jacking machine 4 and the pipeline 41 are jacked into the soil layer by the jacking equipment 3, and then the jacking equipment 3 is reset.

Step nine: and repeating the step eight until the installation of all the pipelines 41 is completed.

Step ten: and (4) removing the pipe jacking machine 4 and the jacking equipment 3 and backfilling the starting well 1 and the receiving well 2.

Referring to fig. 1 and 2, the jacking device 3 includes a bracket 211 fixed to the back plate 121, a plurality of jacks 32 mounted and fixed to the bracket 211, and a grading ring 33. In this embodiment, the jacks 32 are provided with fourteen groups, and piston rods of the jacks 32 are all fixedly connected with one side of the grading ring 33. During the pipe jacking construction, the jacks 32 can drive the grading ring 33 to jack the pipeline 41 into the soil layer by extending out of the piston rods. By the provision of the grading ring 33, the load applied by the plurality of jacks 32 can be uniformly applied to the duct 41 through the grading ring 33. In this embodiment, the grading ring 33 has the same outer diameter as the pipe 41.

Referring to fig. 1 and 2, the positioning track 11 includes two sets of positioning rods 111 arranged in parallel and a plurality of support rods 112 welded and fixed at the bottoms of the two sets of positioning rods 111, the plurality of support rods 112 are uniformly distributed along the length direction of the positioning rods 111, the length direction of the support rods 112 is perpendicular to the length direction of the positioning rods 111, and two ends of the support rods 112 along the length direction are respectively welded on the two sets of positioning rods 111 to support the positioning rods 111. The support rod 112 is fixed at the bottom of the starting well 1 through a riveting bolt to realize the installation and fixation of the positioning rail 11, so that the positioning rail 11 is not easy to displace in the installation process.

Referring to fig. 2 and 3, the positioning rail 11 is further vertically provided with a retaining sleeve 6, a retaining rod 61 is inserted in the retaining sleeve 6 in a sliding manner, the end of the retaining rod 61 is wedge-shaped, and an inclined surface at the top end of the retaining rod 61 is arranged towards the backrest plate 121; the stopping rod 61 is provided with an elastic element 62 for driving the top end of the stopping rod 61 to extend out of the stopping sleeve 6, in this embodiment, the elastic element 62 is a spring, and two ends of the spring are respectively fixedly connected with the bottom end of the stopping rod 61 and the inner bottom wall of the stopping sleeve 6.

Referring to fig. 2 and 3, when the grading ring 33 of the jacking device 3 is separated from the tail end of the installed pipe 41, the top of the retaining rod 61 extends out of the top end of the retaining sleeve 6 and abuts against the tail end of the installed pipe 41, so that the installed pipe 41 is limited, and the situation of road surface collapse caused by retraction of the pipe 41 and the pipe jacking machine 4 is reduced. Through the inclined plane on stopping pole 61 top towards back backup plate 121, when jacking equipment 3 ordered about the pipeline 41 of treating the installation and moved to the inclined plane butt with stopping pole 61 top, stopping pole 61 alright atress retract in stopping sleeve 6, be convenient for treat the pipeline 41 of installing and realize the cooperation of pegging graft with the pipeline 41 of having installed.

Referring to fig. 4 and 5, the stopping sleeve 6 is located between the two sets of positioning rods 111, the connecting rods 63 are fixedly connected to two opposite sides of the stopping sleeve 6, the connecting rods 63 on two opposite sides of the stopping sleeve 6 are fixedly connected to one opposite sides of the two sets of positioning rods 111, and through the arrangement, when the subsequent stopping rod 61 abuts against the end portion of the tail end of the installed pipeline 41, the load applied to the stopping rod 61 by the pipeline 41 can be timely dispersed to the positioning rail 11 through the connecting rods 63.

Referring to fig. 4 and 5, two sets of supporting plates 5 are further vertically erected at the bottom of the starting well 1, the two sets of supporting plates 5 are respectively located on two opposite sides of the positioning rail 11, the two sets of supporting plates 5 are symmetrically distributed about a vertical plane where the positioning rail 11 is located, the top of the supporting plate 5 is hinged with a positioning plate 53, the direction of the rotation axis of the positioning plate 53 is parallel to the length direction of the positioning rail 11, a main driving member 54 for driving the positioning plate 53 to swing is arranged on the supporting plate 5, in this embodiment, the main driving member 54 includes a plurality of main oil cylinders, and the tail ends of the main oil cylinders and the end portions of piston rods of the main oil cylinders are hinged on the supporting rods 112 and the positioning plate 53. The direction of the axis of rotation of the master cylinder and the direction of the axis of rotation of the piston rod of the master cylinder are parallel to the direction of the axis of rotation of the positioning plate 53.

Referring to fig. 2 and 4, when the locating plate 53 on two sets of backup pads 5 all swings and resets to the horizontality, two sets of locating plates 53 are located directly over the positioning track 11 and the one end that two sets of locating plates 53 are close to each other leaves the clearance, through above setting, when the pipeline 41 is to be installed in the hoist, will wait to install pipeline 41 and hang into the clearance between two sets of locating plates 53, alright make it relative with positioning track 11 to wait to install pipeline 41, order about corresponding locating plate 53 downward swing simultaneously through the main drive piece 54 on two sets of backup pads 5, alright put into positioning track 11 with the pipeline 41 of waiting to install, be favorable to reducing traditional hoist pipeline 41 in-process, pipeline 41 takes place to rock and leads to the condition that needs artifical auxiliary adjustment pipeline 41 position, be convenient for pipeline 41 can put into positioning track 11 more accurately fast, make the hoist and mount efficiency of pipeline 41 higher.

Referring to fig. 2 and 4, when the grading ring 33 is separated from the tail end of the installed pipe 41 and the two sets of positioning plates 53 swing upward to be reset, one side of the two sets of positioning plates 53 facing the installed pipe 41 is always abutted to the tail end of the pipe 41, so that after the jacking device 3 is separated from the installed pipe 41, the two sets of positioning plates 53 and the stopping rods 61 can be abutted to the tail end of the installed pipe 41 together, which is beneficial to reducing the situation that the load on the installed pipe 41 is concentrated on the stopping rods 61 for a long time to cause the deformation of the stopping rods 61 due to stress, and is convenient to more stably limit the installed pipe 41 and the pipe push bench 4 to retract after the jacking device 3 is reset.

Referring to fig. 2 and 4, two sets of insertion grooves 13 are preset in the bottom of the starting well 1 corresponding to the two sets of support plates 5, the two sets of support plates 5 are respectively inserted and matched in the two sets of insertion grooves 13, and the two sets of support plates 5 are installed and fixed, so that the two sets of support plates 5 are not required to be integrally formed with the starting well 1, the construction difficulty of the starting well 1 is favorably reduced, and meanwhile, after the pipe jacking construction is completed, the support plates 5 and the positioning plates 53 can be detached, and secondary utilization is facilitated.

Referring to fig. 1 and 4, abutting plates 52 are vertically erected on two opposite sides of a supporting plate 5, and auxiliary driving members 51 for driving the abutting plates 52 to abut against the wall of the starting well 1 are further arranged on two sides of the supporting plate 5, in this embodiment, the auxiliary driving members 51 are oil cylinders, and through the arrangement, the auxiliary driving members 51 on the two opposite sides of the supporting plate 5 are used for driving the abutting plates 52 on the two sides of the supporting plate 5 to abut against the wall of the starting well 1, so that the wall of the starting well 1 is supported, and the wall of the starting well 1 is not prone to collapse; at the same time, when the positioning plate 53 abuts against the end of the installed pipe 41, the load exerted by the installed pipe 41 on the positioning plate 53 can be transmitted to the wall of the originating well 1 through the secondary driving member 51 and the abutting plate 52 in time.

Referring to fig. 2 and 3, the wall of the originating well 1, which is provided with a perforation, is further provided with a flexible sealing ring 14, in this embodiment, the flexible sealing ring 14 is a rubber ring, the flexible sealing ring 14 is arranged around the perforation, and the inner periphery of the flexible sealing ring 14 abuts against the outer periphery of the installed pipeline 41, so as to seal a gap between the perforation and the pipeline 41, which is beneficial to reducing the situation that a large amount of soil outside the originating well 1 gushes into the originating well 1 through the gap between the perforation and the pipeline 41 in the pipe-jacking construction process, one side of the flexible sealing ring 14, which is away from the wall of the originating well 1, is coaxially provided with an annular plate 15, and the annular plate 15 and the flexible sealing ring 14 are fixed on the wall of the originating well 1 through bolts, so as to realize installation of the flexible sealing ring 14.

Referring to fig. 1, a plurality of secant piles 20 are further applied to soil mass on one side, facing the initial well 1, of the receiving well 2, so that the soil mass on one side, facing the initial well 1, of the receiving well 2 is reinforced through the secant piles 20, and therefore the situation that after the push bench 4 is drilled into the receiving well 2, soil mass outside the receiving well 2 enters the receiving well 2 along with the push bench 4 to cause collapse of a road surface is reduced.

Referring to fig. 1, still be provided with support track 21 in receiving well 2, support track 21's length direction is parallel with 11 length direction of positioning track, support track 21 is used for supplying push bench 4 card to go into, make push bench 4 bore can be supported by support track 21 in receiving well 2 after, be favorable to reducing because of push bench 4 weight is great and lead to taking place the circumstances that the downward sloping leads to appearing the kowtow in push bench 4 bores in receiving well 2, make push bench 4 can more steadily bore to receiving well 2 in.

Referring to fig. 1, the two ends of the outer side of the supporting track 21 along the length direction are provided with limiting plates 213, the outer side of the supporting track 21 is further provided with a driving assembly for driving the limiting plates 213 at the two ends to abut against the wall of the receiving well 2 relative to the well, the driving assembly comprises a support 211 arranged at the outer side of the supporting track 21, a bidirectional oil cylinder 212 is mounted on the support 211, and piston rods at the two ends of the bidirectional oil cylinder 212 are connected with the limiting plates 213 at the two ends of the outer side of the supporting track 21 respectively. Realize ordering about limiting plate 213 in the support track 21 outside through drive assembly respectively with two relative wall of a well butts in the receiving well 2, on the one hand, realize spacing to support track 21 for support track 21 is difficult for producing the displacement, and on the other hand, accessible limiting plate 213 realizes the support to the 2 walls of a well of receiving well, thereby when making push bench 4 bore into receiving well 2, the 2 walls of a well of receiving well are difficult for ftractures even collapse. Meanwhile, after the pipe jacking construction is completed, the driving assembly drives the limiting plates 213 at the two outer ends of the supporting rod 112 to be close to each other, so that the supporting rail 21 can be lifted out of the initial well 1.

Referring to fig. 1 and 4, the specific operation steps in step eight are as follows:

the positioning plates 53 are driven to swing to the horizontal state by the main driving member 54, and the pipeline 41 to be installed is hung in the gap between the two sets of positioning plates 53.

The positioning plate 53 is driven to swing downward by the main driving member 54 until the pipe 41 is snapped into the positioning rail 11.

The pipe 41 to be installed is forced by the jacking device 3 towards the installed pipe 41 until the pipe 41 to be installed is plug-fitted to the installed pipe 41.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A water-rich sand layer pipe jacking construction method close to a subway is characterized in that: the method comprises the following steps:

the method comprises the following steps: carrying out tee joint leveling and measurement lofting on the construction area;

step two: pouring an originating well (1) and a receiving well (2), wherein a through hole for a pipe jacking machine (4) to drill into is reserved in the originating well (1);

step three: the pipeline (41) is placed on site for construction and the pipeline (41) is transported: pouring a placing field of the pipeline (41), and transporting the pipeline (41) to the placing field for placing;

step four: a rear wall (12) is poured in the starting well (1), and a rear backup plate (121) is installed on the rear wall (12);

step five: a positioning track (11) is arranged at the bottom of the starting well (1), and jacking equipment (3) is arranged on a rear backup plate (121);

step six: installing a push bench (4): hoisting the push bench (4) into the positioning track (11);

step seven: starting the push bench (4), driving the push bench (4) to penetrate through the through hole and drill into the soil layer through the jacking equipment (3), and then resetting the jacking equipment (3);

step eight: jacking the pipeline (41): hoisting the pipeline (41) to the positioning track (11); jacking the pipe jacking machine (4) and the pipeline (41) into the soil layer through the jacking equipment (3), and then resetting the jacking equipment (3);

step nine: repeating the step eight until the installation of all the pipelines (41) is completed;

step ten: dismantling the pipe jacking machine (4) and the jacking equipment (3) and backfilling the starting well (1) and the receiving well (2);

the utility model discloses a location track (11) go up the vertical stopping sleeve (6) that is provided with, stopping sleeve (6) slip grafting has stopping pole (61), be provided with in stopping sleeve (6) and order about stopping pole (61) top and stretch out the outer elastic component (62) of stopping sleeve (6), stopping pole (61) top is inclined plane leaned on board (121) backward of wedge form and stopping pole (61), works as during jacking equipment (3) break away from installed pipeline (41) tip, stopping pole (61) top stretch out stopping sleeve (6) outer and with the tip butt of installed pipeline (41).

2. The method for constructing the water-rich sand layer pipe jacking adjacent to the subway as claimed in claim 1, wherein: backup pad (5) have all been erect to the relative both sides of positioning rail (11), backup pad (5) top all articulates there is locating plate (53), locating plate (53) axis of revolution direction is parallel with positioning rail (11) extending direction, backup pad (5) are provided with and order about locating plate (53) wobbling main drive spare (54), and are two sets of when locating plate (53) on backup pad (5) all swing to the horizontality, two sets of locating plate (53) are located positioning rail (11) directly over and two sets of locating plate (53) one end that is close to each other leave the clearance.

3. The method for constructing the water-rich sand layer pipe jacking adjacent to the subway as claimed in claim 2, wherein: when the jacking equipment (3) is separated from the end part of the installed pipeline (41) and the two groups of positioning plates (53) swing and reset; the side of the positioning plate (53) facing the installed pipeline (41) is abutted with the end part of the installed pipeline (41).

4. The method for pipe jacking construction of the water-rich sand layer close to the subway as claimed in claim 2, wherein: the bottom of the starting well (1) is provided with two groups of insertion grooves (13) corresponding to the two groups of supporting plates (5), the two groups of supporting plates (5) are respectively inserted into the two groups of insertion grooves (13), abutting plates (52) are erected on two opposite sides of the supporting plates (5), and auxiliary driving pieces (51) for driving the abutting plates (52) to abut against the wall of the starting well (1) are further arranged on two opposite sides of the supporting plates (5).

5. The method for constructing the water-rich sand layer pipe jacking adjacent to the subway as claimed in claim 1, wherein: a plurality of secant piles (20) are buried in soil body on one side of the receiving well (2) facing the starting well (1).

6. The method for constructing the water-rich sand layer pipe jacking adjacent to the subway as claimed in claim 5, wherein: still erect support track (21) that supply push bench (4) card to go into in receiving well (2), limit plate (214) are all erect at support track (21) outside both ends, support track (21) still are provided with limiting plate (214) of ordering about support track (21) outside both ends and butt respectively in the drive assembly of the wall of a well of receiving well (2) both sides relatively.

7. The method for pipe jacking construction of the water-rich sand layer close to the subway as claimed in claim 4, wherein: the well wall of the starting well (1) is further provided with a flexible sealing ring (14), the flexible sealing ring (14) is arranged around the through hole, and the inner periphery of the flexible sealing ring (14) is abutted to the outer periphery of the pipeline (41).

8. The method for pipe jacking construction of the water-rich sand layer close to the subway as claimed in claim 7, wherein: the positioning track (11) comprises two sets of positioning rods (111) which are erected in parallel, the stopping sleeve (6) is located between the two sets of positioning rods (111), two opposite sides of the stopping sleeve (6) are fixedly connected with connecting rods (63), and the two sets of connecting rods (63) are respectively connected to one opposite side of the two sets of positioning rods (111).

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