CN117868846A - Silt jacking method based on axial constraint - Google Patents

Abstract

The invention discloses a silt jacking method based on axial constraint, which comprises a jacking machine system and a jacking construction method, wherein the jacking machine system comprises a machine head, a hydraulic propelling mechanism, a guide pipe, a machine head guide rail, a guide pipe, a connecting seat and a rigid chain transmission box, wherein the rigid chain transmission box is connected with the corresponding connecting seat through a rigid push-pull chain, the rigid push-pull chain can only bend to one side far away from the axial direction of the guide pipe and has rigidity inwards along the radial direction of the guide pipe, a plurality of rigid push-pull chains and the guide pipe together constraint the machine head, the guide pipe and a plurality of pipe joints connected to the rear end of the guide pipe to move along the axial direction, the offset range of the machine head is controllable, and the guide pipe and the pipe joints are rigidly connected. According to the invention, the traction of the guide pipe is matched with the servo motor in the process of pushing the pipe joint, and whether the whole structure is driven in the set axial direction is judged according to the numerical values of the pressure sensors, so that the driving direction of the whole structure is controlled.

Description

Silt jacking method based on axial constraint

Technical Field

The invention relates to the technical field of push bench, in particular to a sludge push bench method based on axial constraint.

Background

The pipe jacking construction is a non-excavation construction method, namely the pipe jacking construction is to overcome the friction force between a pipeline (i.e. a pipe jacking) and surrounding soil by means of jacking force generated by jacking equipment in a working pit, jack the pipeline into the soil according to the designed gradient and transport away earthwork. In actual pipe jacking construction, a plurality of pipe jacking pipe joints are usually adopted for jacking, and after one pipe jacking pipe joint is jacked into a soil layer, the next pipe joint is jacked continuously. The pipeline is buried between two pits after following the tool pipe or the heading machine. The non-excavation engineering technology thoroughly solves the problems of damage to urban buildings, blockage of road traffic and the like in pipeline burying construction, and has outstanding advantages in stabilizing soil layers and protecting environment.

The pipe pushing machine is construction equipment adopted in pipe pushing construction, the pipe pushing machine adopted at present is mainly a hydraulic pipe pushing machine and mainly comprises a rotary excavating system, a main top hydraulic propulsion system, a soil conveying system, a grouting system, measuring equipment, ground hoisting equipment, an electrical system and the like. The rotary excavating system (commonly called as a machine head) mainly comprises a machine head shell, a cutting cutter head, a cutter head speed reducer, a slurry feeding and discharging mechanism, a hydraulic power device, a deviation correcting hydraulic cylinder, a waterproof ring, a cutter head rotating shaft, an electrical system, an automatic control system, an accessory device and the like.

In pipe jacking construction, a pipe joint is required to be pushed into an excavated tunnel once, so that pipe jacking construction operation difficulty is reduced, pipe jacking operation construction safety is improved, linear tunneling operation is adopted in general pipe jacking construction, but in some projects, a plurality of pipelines are required to be paved side by side, the distance between adjacent pipelines is relatively short, pipe jacking construction is performed in a silt geological stratum, in the pipeline jacking process, if the pipelines deviate, deviation cannot be corrected in time, the adjacent pipelines can be extruded, connection between the pipeline position and the pipelines is influenced, the pipeline construction quality is reduced, and therefore, effective control on the tunneling direction of a machine head is required to prevent the machine head from deviating.

Disclosure of Invention

The invention provides a silt jacking method based on axial constraint, and aims to solve the problem that in construction environments aiming at soft soil such as silt geology, a nose of a jacking pipe machine system is easy to deviate from a preset direction, so that construction quality is reduced.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

the silt pipe jacking method based on axial constraint comprises a pipe jacking machine system, wherein the pipe jacking machine system completes accurate control of a system travelling track through a pipe jacking construction method, the pipe jacking machine system comprises a machine head, a hydraulic propulsion mechanism, a soil conveying mechanism, a grouting mechanism, measuring equipment, ground hoisting equipment and an electric mechanism, and the hydraulic propulsion mechanism is arranged in a sending well excavated at a construction position;

the push bench system also comprises a backrest, an oil cylinder frame connected with the front end of the backrest and a plurality of oil cylinders arranged in the oil cylinder frame, wherein the rear end of the backrest is propped against the outer surface of a reinforced concrete structure of the inner wall of a sending well and is fixedly connected with the outer surface of the reinforced concrete structure, a guide pipe penetrates through and is embedded in the reinforced concrete structure of the well wall at the side opposite to the backrest, and a machine head guide rail is arranged between the rear end port of the guide pipe and the front ends of the plurality of oil cylinders;

the machine head guide rail is matched with the guide mechanism in the guide pipe and is used for inputting the machine head into the guide pipe and a plurality of pipe sections to be paved; the rear end of the machine head is fixedly connected with a guide pipe, a plurality of connecting seats are uniformly distributed on the outer wall of the guide pipe around the axis, and a plurality of rigid chain transmission boxes which are matched with the connecting seats one by one are fixedly arranged on the outer surface of the rear end of the guide pipe;

the rigid chain transmission case is connected with the corresponding connecting seat through a rigid push-pull chain, and the part of the rigid push-pull chain positioned in the guide pipe is parallel to the axis of the guide pipe;

the rigid push-pull chain can only bend towards one side far away from the axial direction of the guide pipe and has rigidity inwards along the radial direction of the guide pipe, the guide pipe and the guide pipe are together restrained by the rigid push-pull chain, the guide pipe and the pipe sections connected to the rear end of the guide pipe move along the axial direction, the deflection range of the machine head is controllable, and the guide pipe is rigidly connected with the pipe sections.

Preferably, the telescopic ends of the oil cylinders are commonly connected with a pushing ring, the front ends of the pushing ring are uniformly provided with a plurality of pressure sensors, and the working ends of the pressure sensors are positioned on the same vertical face and are vertical to the axis of the pushing ring;

when the front end of the pushing ring is tightly pressed against the rear end of the last pipe section and the guide pipe is tensioned by the rigid push-pull chains, the guide pipe and each pipe section are formed into an integral structure through tensioning, and the pressure values detected by the pressure sensors are consistent, the axis of the machine head is overlapped with the axes of the pushing ring, the guide pipe, the pipe sections and the guide pipe and is positioned in a preset linear tunneling track.

Preferably, the rigid chain transmission case comprises a chain box, wherein a coiled chain guide rail is arranged in the chain box, the rigid push-pull chain is coiled in the guide rail and is in sliding fit with the guide rail, and a servo motor is arranged outside a box wall at one side of an output port of the chain box;

the output shaft of the servo motor is provided with a chain wheel, the chain wheel is positioned in the chain box and is meshed and connected with a rigid push-pull chain, and the rigid push-pull chain bypasses a tensioning wheel arranged at the rear end opening of the guide tube, enters a guide mechanism in the guide tube and is meshed and connected with a transmission chain wheel in the guide mechanism.

Preferably, the guiding mechanism comprises a plurality of groups of guiding units which are in one-to-one correspondence with the rigid chain transmission boxes;

the guide unit comprises a plurality of guide assemblies which are axially arranged along the direction parallel to the guide pipe, the guide assemblies comprise 2 support plates which are oppositely arranged on the inner surface of the guide pipe, and transverse shafts penetrate through and are fixedly connected with the tops of the 2 support plates;

the two ends of the transverse shaft are respectively connected with rollers in a rotating way, the outer wall of the transverse shaft between the 2 support plates is connected with driving sprockets in a rotating way, a plurality of driving sprockets of the same guide unit are meshed with the rigid push-pull chain in the input guide pipe and limit the rigid push-pull chain to be parallel to the axis of the guide pipe, and the head part of the rigid push-pull chain is detachably and fixedly connected with the connecting seat.

Preferably, the outer surface of the pipe joint is provided with a guide rail mechanism matched with the guide mechanism, and the guide rail mechanism comprises a plurality of guide rail units which are in one-to-one correspondence with the guide units;

the guide rail unit comprises a linear chute arranged on the outer surface of the pipe joint along the direction parallel to the axis of the pipe joint, the linear chute is matched with a plurality of rollers of the same guide unit for use, when the pipe joint enters the guide mechanism, the pipe joint is coaxial with the guide pipe, and the rigid push-pull chain is restrained between the outer surface of the pipe joint and the drive sprocket and prevented from being separated from the drive sprocket;

the outer surface of the guide pipe is also provided with a guide rail mechanism consistent with the pipe joint structure.

Preferably, the front end of the pipe joint is provided with an annular bulge, the rear ends of the pipe joint and the guide pipe are provided with annular grooves, and adjacent pipe joints or pipe joints and the guide pipe are connected through the annular bulge inserted into the annular grooves;

and flange plates are fixedly arranged between the groove walls of the linear sliding grooves adjacent to the outer surface of the pipe joint or the guide pipe and positioned at the end part of the pipe joint or the guide pipe, a plurality of flange plates are uniformly distributed around the axis of the pipe joint or the guide pipe, and the flange plates are provided with an axial rigidity constraint mechanism.

Preferably, the flange at the front end of the pipe joint is provided with a through hole, the flange at the rear end of the pipe joint is provided with a threaded hole, the flange at the rear end of the guide pipe is also provided with a threaded hole, and the axial rigidity constraint mechanism comprises a fixed seat fixedly arranged at the front part of the outer surface of the pipe joint;

the front end of the fixed seat is rotationally connected with a screw rod through a thrust bearing, the end part of the screw rod is provided with a locking block, and the front end of the locking block is provided with a guide head;

the screw rod penetrates through the through hole to extend forwards and is in clearance fit with the through hole, when the adjacent pipe joint or the pipe joint and the guide pipe are butted and pressed by the annular groove and the annular bulge, the front end of the screw rod enters into the threaded hole of the adjacent front pipe joint and rotates under the pressure of the threaded hole and penetrates through the threaded hole, and the outer surface of the pipe joint at the front side of the threaded hole is provided with a telescopic sleeve structure;

the telescopic sleeve structure comprises a first sleeve fixedly arranged on the outer surface of the pipe joint, the opening end of the first sleeve faces one side of the threaded hole, a second sleeve is connected in the first sleeve in a sliding mode, a compression spring is connected between the bottom end of the second sleeve and the inner bottom of the first sleeve, and a locking hole matched with the locking block is formed in the opening end of the first sleeve.

Preferably, the cross sections of the locking hole and the locking block are regular polygons, the outer edge dimension of the locking block is smaller than the outer diameter of the screw rod, and when the locking block is matched with the locking hole, the opposite flange pieces of the 2 adjacent pipe joints are tightly attached.

Preferably, the pipe jacking construction method comprises the following steps:

(1) Digging a sending well and a receiving well at a construction position, pouring a reinforced concrete structure on a well wall of the sending well, pre-burying a guide pipe according to a preset tunneling straight line track, and arranging a hydraulic propulsion mechanism and a machine head guide rail on the opposite side of the guide pipe, so that the height of the upper surface of the machine head guide rail is matched with the height of a roller below the inside of the guide pipe, and the machine head fixedly connected with the guide pipe and each pipe section are conveniently input into the guide mechanism of the guide pipe;

(2) The connecting seats of the guide pipes are respectively and fixedly connected with the heads of the rigid push-pull chains, and the machine head with the guide pipes is pushed into the guide rail mechanism of the guide pipes through the oil cylinders; sequentially lowering pipe joints from the wellhead of the sending well, and sequentially pushing the pipe joints into the guide rail mechanism;

when the pipe joint is connected with the guide pipe or the adjacent pipe joint is connected, the oil cylinder presses the rear end of the last pipe joint through the pushing ring, each servo motor tightens the rigid push-pull chain, and the detection value of each pressure sensor is kept consistent within a certain error range by adjusting the tightening degree of each servo motor; at this time, the tunneling square of the machine head is adjusted, so that the machine head is positioned in a preset linear tunneling track;

meanwhile, the axial rigidity constraint mechanism connects all pipe joints and guide pipes into 1 integral structure with rigidity, and when the integral structure with rigidity is formed, the guide pipes provide a guiding function for the integral structure with rigidity, and further constraint the linear tunneling track along the axial direction of the guide pipes;

on the basis, the oil cylinder is matched with the servo motor to realize the section-by-section pushing and jacking of the pipe joint;

(3) After all pipe joints are installed, fixing the pipe joints in a receiving well, dismantling a machine head connected with a guide pipe, dismantling the head of the rigid push-pull chain from a connecting seat, and withdrawing the rigid push-pull chain into a chain box by action of each servo motor; the rigid chain drive housing is removed from the guide tube for further use.

The sludge jacking method based on axial constraint has the beneficial effects that:

according to the invention, the tunneling directions of the machine head and the pipe joints are integrally regulated based on a mechanical principle, the machine head with the guide pipe and each pipe joint are made into 1 rigid integral structure during construction by arranging the axial rigidity constraint mechanism, so that on one hand, the traveling track deviation caused by mutual dislocation is avoided, on the other hand, the guide pipe is provided with the guiding and axial constraint functions of the integral structure, on the basis, the rigid chain transmission case is arranged, the axial directions of the pipe joints and the guide pipe are further constrained by a plurality of rigid push-pull chains, the pipe joints are pushed, the guide pipe is pulled by matching with the servo motor in the process of pushing the pipe joints, so that the tunneling movement of the integral structure is realized, and whether the integral structure is tunneled along the set axial direction is judged according to the numerical values of each pressure sensor, so that the precise control of the integral traveling track of the machine head and the pipe joints is realized, and the sedimentation deviation problem of the machine head and part of the pipe joints in a silt geological environment is avoided.

Description of the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a guide tube of the present invention;

FIG. 3 is a schematic view of the partial structure of the present invention at A;

FIG. 4 is a schematic elevational view of the push ring of the present invention;

FIG. 5 is a schematic elevational view of the guide tube of the present invention (with the tensioning wheel omitted);

FIG. 6 is a schematic view of the partial structure of the present invention at B;

1-sending well, 2-sending well back wall, 3-sending well front wall, 4-backrest, 5-oil cylinder frame, 6-pushing ring, 61-pressure sensor, 7-machine head guide rail, 8-guide pipe, 9-rigid chain transmission case and 91-chain box; 92-a servo motor; 93-rigid push-pull chain; 94-an output port; 10-pipe joints, 101-annular grooves, 11-guide pipes, 12-machine heads, 13-support plates, 14-rollers, 15-linear sliding grooves, 16-transmission chain wheels, 17-tensioning wheels, 18-connecting seats, 19-fixing seats, 20-thrust bearings, 21-flange plates, 22-second sleeves and 23-lead screws; 24-through holes, 25-threaded holes, 26-locking blocks and 27-guide heads; 28-first sleeve, 29-compression spring, 30-transverse shaft.

The specific embodiment is as follows:

the following detailed description of the embodiments of the present invention in a stepwise manner is provided merely as a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, but any modifications, equivalents, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.

In the description of the present invention, it should be noted that, the positional or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, and specific orientation configuration and operation, and thus should not be construed as limiting the present invention.

Example 1

Referring to fig. 1 to 6, an axial constraint-based silt jacking method comprises a jacking pipe machine system, wherein the jacking pipe machine system is used for accurately controlling a system travelling track through a jacking pipe construction method, the jacking pipe machine system comprises a machine head 12, a hydraulic pushing mechanism, a soil conveying mechanism, a grouting mechanism, measuring equipment, ground hoisting equipment and an electric mechanism, and as shown in fig. 1, the hydraulic pushing mechanism is arranged in a sending well 1 excavated at a construction position and comprises a backrest 4, an oil cylinder frame 5 connected with the front end of the backrest 4 and a plurality of oil cylinders arranged in the oil cylinder frame; the mechanical structure of the pipe pushing jack system is the prior art, and the problem is not solved by the prior scheme.

As shown in fig. 1, the rear end of the backrest 4 is abutted against and fixedly connected with the outer surface of a reinforced concrete structure of the inner wall of the sending well 1, a guide pipe 8 is penetrated and embedded in the reinforced concrete structure of the well wall at one side opposite to the backrest 4 of the sending well 1, a machine head guide rail 7 is arranged between the rear end port of the guide pipe 8 and the front ends of a plurality of oil cylinders, and the machine head guide rail 7 is matched with a guide mechanism in the guide pipe 8 and is used for inputting a machine head 12 and a plurality of pipe joints 10 to be paved into the guide pipe 8.

The guide rail of the machine head is a common technology, the top end of the guide rail is an arc-shaped surface, the guide rail is convenient for guiding the machine head and the pipe joint along the tunneling track, and the guide pipe 8 is arranged on the basis of the guide rail. The guide tube 8 has the functions of: on one hand, the guiding of the machine head and the pipe joint is continued, and on the other hand, the axial constraint effect of the machine head and the pipe joint is realized, so that the drift of the tunneling direction of the machine head is avoided.

As shown in fig. 1, the rear end of the machine head 12 is fixedly connected with a guide pipe 11, a plurality of connecting seats 18 are uniformly distributed on the outer wall of the guide pipe 11 around the axis, and a plurality of rigid chain transmission boxes 9 which are matched with the connecting seats 18 one by one are fixedly arranged on the outer surface of the rear end of the guide pipe 8.

The rigid chain transmission case 9 is connected with the corresponding connecting seat 18 through a rigid push-pull chain 93, the part of the rigid push-pull chain 93 positioned in the guide tube 8 is parallel to the axis of the guide tube 11, the rigid push-pull chain 93 can only bend to one side far away from the axial direction of the guide tube 8 and has rigidity inwards along the radial direction of the guide tube 8, a plurality of rigid push-pull chains 93 and the guide tube 8 together restrict the machine head 12, the guide tube 11 and a plurality of tube sections 10 connected to the rear end of the guide tube 11 to move along the axial direction and enable the deflection range of the machine head 12 to be controllable, and the rigid connection between the guide tube and the tube sections and between the tube sections 10 is realized.

Since the guide pipe 11 is fixedly connected with the machine head 12, the adjustment of the position of the guide pipe 11 is equivalent to the adjustment of the tunneling direction of the machine head 12, and due to the rigid connection between the pipe joints 10 and between the guide pipe and the pipe joints 10, the settlement and deflection of the machine head or part of the pipe joints in the silt terrain during the tunneling process are avoided.

On the other hand, the capability of the guide tube for axially limiting and restraining the integral rigid structure formed by the machine head, the guide tube and the pipe joint is ensured, namely, the restraint of the guide tube on the pipe joint in the guide tube can be transmitted to the machine head through the force transmission effect. The correction of the tunneling track of the machine head can be realized by pulling the guide pipe through the rigid push-pull chain and extruding the rear end of the pipe joint through a plurality of oil cylinders and combining the limit constraint of the guide pipe on the whole rigid structure, so that the drift in the tunneling process is prevented.

Example 2

As shown in fig. 1 and 4, the telescopic ends of the cylinders are commonly connected with a pushing ring 6, the front ends of the pushing ring 6 are uniformly distributed with a plurality of pressure sensors 61, and the working ends of the pressure sensors are positioned on the same vertical face and are perpendicular to the axis of the pushing ring. When the front end of the pushing ring 6 is pressed against the rear end of the last pipe section 10, and the guide pipe 11 is tensioned by the rigid push-pull chains 93, the guide pipe 11 and each pipe section 10 are formed into an integral structure through tensioning, and the pressure values detected by the pressure sensors 61 are consistent, the axis of the machine head 12 is overlapped with the axis of the pushing ring 6, the guide pipe 8, the pipe section 10 and the guide pipe 11 and is positioned in a preset straight tunneling track.

The embodiment provides a mode of correcting the tunneling track, and the principle is as follows:

when the axis of the machine head 12 overlaps with the axes of the pushing ring 6, the guide pipe 8, the pipe joint 10 and the guide pipe 11 and is located in a preset straight line tunneling track, the common axis is located on a preset horizontal straight line, and since the working ends of the pressure sensors 61 are located on the same vertical plane and are perpendicular to the axis of the pushing ring (the axis direction of the pushing ring is also the extending and retracting direction of the oil cylinder), the pressure sensors 61 should be uniformly contacted with the vertical plane of the rear end of the last pipe joint (the vertical plane of the front and rear ends should be ensured to be perpendicular to the axis thereof when the pipe joint is prefabricated in a factory). The pressure values detected by the pressure sensors are consistent, and errors in actual construction are considered, so that the pressure values detected within a certain error range are consistent, namely, the machine head is positioned in a preset tunneling track.

It should be pointed out that the present invention corrects the heading direction of the machine head based on the principle of mechanics, unlike the conventional method of searching for an axial positioning point by laser irradiation, which has a certain technical obstacle, for example, when a silt guide pipe or other pipeline existing in a pipe section blocks the laser line, the positioning is ineffective.

More importantly, the invention solves the problem of possible sedimentation in the sludge terrain, in the practical construction, the sedimentation can occur at the position of a machine head or at 1 or more pipe joints (if the pipe joints are subjected to larger sedimentation, the laser line cannot find a receiving point and then the positioning fails), so the invention integrates the machine head and the pipe joints into a whole through the pushing and pressing of an oil cylinder and the traction and restraint of a rigid chain, and further realizes the track adjustment of the whole structure.

Example 3

As shown in fig. 1, 2, 5 and 6, the rigid chain transmission case comprises a chain box 91, a coiled chain guide rail is arranged in the chain box 91, a rigid push-pull chain 93 is coiled in the guide rail and is in sliding fit with the guide rail, a servo motor is arranged outside a box wall at one side of an output port 94 of the chain box 91, and a chain wheel is arranged on an output shaft of the servo motor. The chain wheel is positioned in the chain box and is in meshed connection with the rigid push-pull chain 93, and the rigid push-pull chain 93 bypasses the tensioning wheel 17 arranged at the rear end opening of the guide tube 8, enters the guide mechanism in the guide tube 8 and is in meshed connection with the transmission chain wheel 16 in the guide mechanism.

The rigid push-pull chain related to the invention can be any rigid chain capable of realizing the function of the chain in the prior art, wherein, the specific structure of the rigid chain transmission case can be referred to the patent document with the application number of CN202210808055. X: a square locking type rigid chain push-pull actuating mechanism. The present invention will not be specifically discussed with respect to the relevant structure.

Example 4

As shown in fig. 1, 2, 5 and 6, the guiding mechanism comprises a plurality of groups of guiding units corresponding to the rigid chain transmission boxes 9 one by one, the guiding units comprise a plurality of guiding components arranged along the axial direction parallel to the guiding pipes 8, and the guiding components comprise 2 supporting plates 13 oppositely arranged on the inner surfaces of the guiding pipes. The top of the 2 supporting plates 13 is penetrated and fixedly connected with a transverse shaft 30, two ends of the transverse shaft 30 are respectively and rotatably connected with a roller 14, the outer wall of the transverse shaft 30 between the 2 supporting plates 13 is rotatably connected with a driving chain wheel 16, a plurality of driving chain wheels 16 of the same guiding unit are meshed and connected with a rigid push-pull chain 93 in the input guiding tube 8, the rigid push-pull chain 93 is limited to be parallel to the axis of the guiding tube 8, and the head of the rigid push-pull chain 93 is detachably and fixedly connected with the connecting seat 18.

As shown in fig. 1, 2, 5 and 6, the outer surface of the pipe joint 10 is provided with a guide rail mechanism matched with the guide mechanism, the guide rail mechanism comprises a plurality of guide rail units corresponding to the guide units one by one, the guide rail units comprise linear sliding grooves 15 arranged on the outer surface of the pipe joint 10 along the axis direction parallel to the pipe joint 10, and the linear sliding grooves 15 are matched with a plurality of rollers 14 of the same guide unit. When the pipe joint 10 enters the guiding mechanism, the pipe joint 10 is coaxial with the guiding pipe 8, and the rigid push-pull chain 13 is restrained between the outer surface of the pipe joint 10 and the driving sprocket 16 and prevented from being separated from the driving sprocket 16; the outer surface of the guide pipe is also provided with a guide rail mechanism consistent with the pipe joint structure.

In the embodiment, the constraint of the pipe joint and the driving sprocket ensures that the rigid push-pull chain in the guide pipe is coaxial with the guide pipe and the pipe joint and cannot be separated from the driving sprocket, and further ensures that the acting force applied to the guide pipe and the pipe joint by the rigid push-pull chain is parallel with the common axis when the rigid push-pull chain is tensioned, so that the traction force of the rigid push-pull chain has the machine head correcting effect.

Example 5

As shown in fig. 1, 3, 5 and 6, the front end of the pipe joint 10 is provided with an annular protrusion (which is a common structure and is not shown), the rear ends of the pipe joint 10 and the guiding pipe 11 are provided with annular grooves 101, and adjacent pipe joints 10 or pipe joints and guiding pipes are connected through the annular protrusion inserted into the annular grooves 101.

A plurality of flange pieces 21 are uniformly distributed around the axis of the pipe joint 10 or the guide pipe, and the flange pieces 21 are provided with an axial rigidity constraint mechanism. The axial rigidity constraint mechanism has the function of ensuring the axial rigidity constraint between the guide pipe and the pipe joint and between the pipe joint and the pipe joint, ensuring that the guide pipe and the pipe joint are not staggered, and further ensuring the axial constraint effect of the guide pipe on the whole rigid structure.

Example 6

As shown in fig. 1, 3, 5 and 6, the flange piece at the front end of the pipe joint 10 is provided with a through hole 24, the flange piece 21 at the rear end is provided with a threaded hole 25, the flange piece at the rear end of the guiding pipe is also provided with a threaded hole, the axial rigidity constraint mechanism comprises a fixed seat 19 fixedly arranged at the front part of the outer surface of the pipe joint 10, the front end of the fixed seat 19 is rotationally connected with a screw rod 23 through a thrust bearing 20, the end part of the screw rod 23 is provided with a locking block 26, and the front end of the locking block 26 is provided with a guiding head 27.

The screw rod 23 extends forwards through the through hole and is in clearance fit with the through hole 24, when the adjacent pipe joint 10 or the pipe joint and the guide pipe are butted and pressed by the annular groove and the annular bulge, the front end of the screw rod 23 enters the threaded hole 25 of the adjacent front pipe joint and rotates under the pressure of the threaded hole 25 and passes through the threaded hole 25, and the outer surface of the pipe joint 10 at the front side of the threaded hole 25 is provided with a telescopic sleeve structure. The telescopic sleeve structure comprises a first sleeve 28 fixedly arranged on the outer surface of the pipe joint 10, the opening end of the first sleeve 28 faces one side of the threaded hole 25, a second sleeve 22 is connected in a sliding manner in the first sleeve 28, a compression spring 29 is connected between the bottom end of the second sleeve 22 and the inner bottom of the first sleeve 28, and a locking hole matched with the locking block is formed in the opening end of the first sleeve 28.

The cross sections of the locking hole and the locking block 26 are regular polygons, the outer edge dimension of the locking block 26 is smaller than the outer diameter of the screw rod 23 (the two dimensions are consistent in fig. 3, an optimization mode is provided in the embodiment, so that the screw rod is convenient to be directly matched with the threaded hole), and when the locking block 26 is matched with the locking hole, the opposite flange pieces 21 of the 2 adjacent pipe joints 10 are tightly attached.

In this embodiment, based on the principle of the ball screw, when the screw is extruded by the screw hole, the screw passes through the screw hole, the guide head 27 firstly enters the locking hole, and in the rotary jacking process of the screw, the locking block enters the locking hole and is locked by the locking hole, so that the screw cannot rotate, at this time, the opposite flange pieces 21 of the 2 adjacent pipe sections 10 are tightly attached, and the axial rigid constraint and rigid connection between the adjacent pipe sections and between the pipe sections and the guide pipe are achieved, thereby ensuring the axial constraint effect of the guide pipe on the whole rigid structure. On this basis, the constraint of the plurality of rigid chains with respect to the common axis also plays a role, and the adjustment of the handpiece trajectory is achieved by pulling the guide tube. The locking block cannot rotate in the locking hole, so that the screw rod is limited from being capable of relatively displacing with the threaded hole through rotation.

Example 7

The construction method of the pipe pushing jack system based on axial constraint, as shown in fig. 1-6, comprises the following steps:

(1) Digging a sending well and a receiving well at a construction position, pouring a reinforced concrete structure on the well wall of the sending well, pre-burying a guide pipe 8 according to a preset tunneling straight line track, and arranging a hydraulic propulsion mechanism and a machine head guide rail on the opposite side of the guide pipe 8, so that the height of the upper surface of the machine head guide rail is matched with the height of a roller below the inside of the guide pipe, and the machine head 12 fixedly connected with the guide pipe and each pipe section 10 are conveniently input into the guide mechanism of the guide pipe 8.

(2) The connecting seats 18 of the guide pipes 11 are respectively and fixedly connected with the heads of the rigid push-pull chains 93, and the nose 12 with the guide pipes is pushed into the guide rail mechanism of the guide pipe 8 through the oil cylinder; and sequentially lowering the pipe sections 10 from the wellhead of the sending well, and sequentially pushing the pipe sections 10 into the guide rail mechanism.

When the pipe joint is connected with the guide pipe or the adjacent pipe joint is connected, the oil cylinder presses the rear end of the last pipe joint through the pushing ring, each servo motor tightens the rigid push-pull chain, and the detection value of each pressure sensor is kept consistent within a certain error range by adjusting the tightening degree of each servo motor; at this time, the tunneling square of the machine head is adjusted, so that the machine head is positioned in a preset linear tunneling track.

Meanwhile, the axial rigidity constraint mechanism connects all pipe joints and guide pipes into 1 integral structure with rigidity, and when the integral structure with rigidity is formed, the guide pipes provide a guiding function for the integral structure with rigidity, and further constraint the linear tunneling track along the axial direction of the guide pipes; on the basis, the oil cylinder is matched with the servo motor to realize the section-by-section pushing and jacking of the pipe joint.

The interfitting here refers to: the oil cylinder applies pressure uniformly through the pushing ring, the servo motor releases the rigid push-pull chain at the same time, so that the whole structure is pushed along the preset track, the speed of the servo motor for releasing the rigid push-pull chain is matched with the pushing speed of the oil cylinder, and the detection values of the pressure sensors are kept consistent within a certain error range, so that the whole structure is pushed along the preset track.

(3) After all the pipe sections 10 are installed, fixing the pipe sections in a receiving well and removing the machine head connected with the guide pipe, simultaneously removing the head of the rigid push-pull chain 93 from the connecting seat 18, and withdrawing the rigid push-pull chain into the chain box 91 by the action of each servo motor; the rigid chain drive housing 9 is detached from the guide tube 8 for the next use.

According to the invention, the tunneling direction of the machine head and the pipe joints is integrally regulated based on a mechanical principle, and the machine head with the guide pipe and each pipe joint are formed into 1 rigid integral structure during construction by arranging the axial rigidity constraint mechanism, so that on one hand, the running track deviation caused by mutual dislocation is avoided, and on the other hand, the guide pipe has the guiding and axial constraint functions of the integral structure.

On this basis, through setting up the rigid chain driving case, make a plurality of rigidity push-pull chains to the axial further constraint of tube coupling and guide pipe, cooperate servo motor to pull the guide pipe through the in-process of advancing the tube coupling and make overall structure tunnelling remove, judge through each pressure sensor numerical value unanimously whether overall structure tunnelling along the axis direction of settlement, and then realized the accurate control to the whole orbit of advancing of aircraft nose and tube coupling, avoided the settlement skew problem that aircraft nose and partial tube coupling take place in silt geological environment.

Claims (9)

1. The utility model provides a silt pipe jacking method based on axial constraint, includes push bench system, and push bench system accomplishes the accurate control of system travel track through push bench construction method, and push bench system includes aircraft nose, hydraulic propulsion mechanism, earth conveying mechanism, slip casting mechanism, measuring equipment, ground lifting device and electric mechanism, and hydraulic propulsion mechanism locates in the transmission well that the construction position excavated, characterized by:

the push bench system also comprises a backrest, an oil cylinder frame connected with the front end of the backrest and a plurality of oil cylinders arranged in the oil cylinder frame, wherein the rear end of the backrest is propped against the outer surface of a reinforced concrete structure of the inner wall of a sending well and is fixedly connected with the outer surface of the reinforced concrete structure, a guide pipe penetrates through and is embedded in the reinforced concrete structure of the well wall at the side opposite to the backrest, and a machine head guide rail is arranged between the rear end port of the guide pipe and the front ends of the plurality of oil cylinders;

the machine head guide rail is matched with the guide mechanism in the guide pipe and is used for inputting the machine head into the guide pipe and a plurality of pipe sections to be paved; the rear end of the machine head is fixedly connected with a guide pipe, a plurality of connecting seats are uniformly distributed on the outer wall of the guide pipe around the axis, and a plurality of rigid chain transmission boxes which are matched with the connecting seats one by one are fixedly arranged on the outer surface of the rear end of the guide pipe;

the rigid chain transmission case is connected with the corresponding connecting seat through a rigid push-pull chain, and the part of the rigid push-pull chain positioned in the guide pipe is parallel to the axis of the guide pipe;

the rigid push-pull chain can only bend towards one side far away from the axial direction of the guide pipe and has rigidity inwards along the radial direction of the guide pipe, the guide pipe and the guide pipe are together restrained by the rigid push-pull chain, the guide pipe and the pipe sections connected to the rear end of the guide pipe move along the axial direction, the deflection range of the machine head is controllable, and the guide pipe is rigidly connected with the pipe sections.

2. The sludge jacking method based on axial constraint as claimed in claim 1, wherein: the telescopic ends of the oil cylinders are commonly connected with pushing rings, the front ends of the pushing rings are uniformly provided with a plurality of pressure sensors, and the working ends of the pressure sensors are positioned on the same vertical face and are vertical to the axis of the pushing rings;

when the front end of the pushing ring is tightly pressed against the rear end of the last pipe section and the guide pipe is tensioned by the rigid push-pull chains, the guide pipe and each pipe section are formed into an integral structure through tensioning, and the pressure values detected by the pressure sensors are consistent, the axis of the machine head is overlapped with the axes of the pushing ring, the guide pipe, the pipe sections and the guide pipe and is positioned in a preset linear tunneling track.

3. The sludge jacking method based on axial constraint as claimed in claim 2, wherein: the rigid chain transmission case comprises a chain box, wherein a coiled chain guide rail is arranged in the chain box, the rigid push-pull chain is coiled in the guide rail and is in sliding fit with the guide rail, and a servo motor is arranged outside the wall of the box at one side of an output port of the chain box;

the output shaft of the servo motor is provided with a chain wheel, the chain wheel is positioned in the chain box and is meshed and connected with a rigid push-pull chain, and the rigid push-pull chain bypasses a tensioning wheel arranged at the rear end opening of the guide tube, enters a guide mechanism in the guide tube and is meshed and connected with a transmission chain wheel in the guide mechanism.

4. A sludge jacking method based on axial constraints as claimed in claim 3, wherein: the guide mechanism comprises a plurality of groups of guide units which are in one-to-one correspondence with the rigid chain transmission boxes;

the guide unit comprises a plurality of guide assemblies which are axially arranged along the direction parallel to the guide pipe, the guide assemblies comprise 2 support plates which are oppositely arranged on the inner surface of the guide pipe, and transverse shafts penetrate through and are fixedly connected with the tops of the 2 support plates;

the two ends of the transverse shaft are respectively connected with rollers in a rotating way, the outer wall of the transverse shaft between the 2 support plates is connected with driving sprockets in a rotating way, a plurality of driving sprockets of the same guide unit are meshed with the rigid push-pull chain in the input guide pipe and limit the rigid push-pull chain to be parallel to the axis of the guide pipe, and the head part of the rigid push-pull chain is detachably and fixedly connected with the connecting seat.

5. The sludge jacking method based on axial constraint as claimed in claim 4, wherein: the outer surface of the pipe joint is provided with a guide rail mechanism matched with the guide mechanism, and the guide rail mechanism comprises a plurality of guide rail units which are in one-to-one correspondence with the guide units;

the guide rail unit comprises a linear chute arranged on the outer surface of the pipe joint along the direction parallel to the axis of the pipe joint, the linear chute is matched with a plurality of rollers of the same guide unit for use, when the pipe joint enters the guide mechanism, the pipe joint is coaxial with the guide pipe, and the rigid push-pull chain is restrained between the outer surface of the pipe joint and the drive sprocket and prevented from being separated from the drive sprocket;

the outer surface of the guide pipe is also provided with a guide rail mechanism consistent with the pipe joint structure.

6. The sludge jacking method based on axial constraint as claimed in claim 5, wherein: the front end of the pipe joint is provided with an annular bulge, the rear ends of the pipe joint and the guide pipe are provided with annular grooves, and adjacent pipe joints or pipe joints and the guide pipe are connected through the annular bulge inserted into the annular grooves;

and flange plates are fixedly arranged between the groove walls of the linear sliding grooves adjacent to the outer surface of the pipe joint or the guide pipe and positioned at the end part of the pipe joint or the guide pipe, a plurality of flange plates are uniformly distributed around the axis of the pipe joint or the guide pipe, and the flange plates are provided with an axial rigidity constraint mechanism.

7. The sludge jacking method based on axial constraint as claimed in claim 6, wherein: the flange plate at the front end of the pipe joint is provided with a through hole, the flange plate at the rear end of the pipe joint is provided with a threaded hole, the flange plate at the rear end of the guide pipe is also provided with a threaded hole, and the axial rigidity constraint mechanism comprises a fixed seat fixedly arranged at the front part of the outer surface of the pipe joint;

the front end of the fixed seat is rotationally connected with a screw rod through a thrust bearing, the end part of the screw rod is provided with a locking block, and the front end of the locking block is provided with a guide head;

the screw rod penetrates through the through hole to extend forwards and is in clearance fit with the through hole, when the adjacent pipe joint or the pipe joint and the guide pipe are butted and pressed by the annular groove and the annular bulge, the front end of the screw rod enters into the threaded hole of the adjacent front pipe joint and rotates under the pressure of the threaded hole and penetrates through the threaded hole, and the outer surface of the pipe joint at the front side of the threaded hole is provided with a telescopic sleeve structure;

the telescopic sleeve structure comprises a first sleeve fixedly arranged on the outer surface of the pipe joint, the opening end of the first sleeve faces one side of the threaded hole, a second sleeve is connected in the first sleeve in a sliding mode, a compression spring is connected between the bottom end of the second sleeve and the inner bottom of the first sleeve, and a locking hole matched with the locking block is formed in the opening end of the first sleeve.

8. The sludge jacking method based on axial constraint as claimed in claim 7, wherein: the cross sections of the locking hole and the locking block are regular polygons, the outer edge size of the locking block is smaller than the outer diameter of the screw rod, and when the locking block is matched with the locking hole, the opposite flange pieces of the 2 adjacent pipe sections are tightly attached.

9. The sludge jacking method based on axial constraint of claim 8, wherein the method comprises the following steps: the pipe jacking construction method comprises the following steps of:

(1) Digging a sending well and a receiving well at a construction position, pouring a reinforced concrete structure on a well wall of the sending well, pre-burying a guide pipe according to a preset tunneling straight line track, and arranging a hydraulic propulsion mechanism and a machine head guide rail on the opposite side of the guide pipe, so that the height of the upper surface of the machine head guide rail is matched with the height of a roller below the inside of the guide pipe, and the machine head fixedly connected with the guide pipe and each pipe section are conveniently input into the guide mechanism of the guide pipe;

(2) The connecting seats of the guide pipes are respectively and fixedly connected with the heads of the rigid push-pull chains, and the machine head with the guide pipes is pushed into the guide rail mechanism of the guide pipes through the oil cylinders; sequentially lowering pipe joints from the wellhead of the sending well, and sequentially pushing the pipe joints into the guide rail mechanism;

when the pipe joint is connected with the guide pipe or the adjacent pipe joint is connected, the oil cylinder presses the rear end of the last pipe joint through the pushing ring, each servo motor tightens the rigid push-pull chain, and the detection value of each pressure sensor is kept consistent within a certain error range by adjusting the tightening degree of each servo motor; at this time, the tunneling square of the machine head is adjusted, so that the machine head is positioned in a preset linear tunneling track;

meanwhile, the axial rigidity constraint mechanism connects all pipe joints and guide pipes into 1 integral structure with rigidity, and when the integral structure with rigidity is formed, the guide pipes provide a guiding function for the integral structure with rigidity, and further constraint the linear tunneling track along the axial direction of the guide pipes;

on the basis, the oil cylinder is matched with the servo motor to realize the section-by-section pushing and jacking of the pipe joint;

(3) After all pipe joints are installed, fixing the pipe joints in a receiving well, dismantling a machine head connected with a guide pipe, dismantling the head of the rigid push-pull chain from a connecting seat, and withdrawing the rigid push-pull chain into a chain box by action of each servo motor; the rigid chain drive housing is removed from the guide tube for further use.