CN115522950A - A ring-cut steel blade foot device for pipe jacking construction in soft ground and silt environment - Google Patents

Abstract

The invention discloses an annular cutting type steel blade device for pipe jacking construction in a soft foundation silt environment, which comprises a socket pipe and a steel blade component, wherein the steel blade component is arranged at one end of the socket pipe penetrating into the stratum, two groups of bearing brackets for supporting the socket pipe to transversely move are arranged on the front side and the rear side of the stratum, a cast-in-situ counter-force wall is arranged on one side of the stratum far away from the steel blade component, and a driving component for pushing the socket pipe to jack into the stratum is arranged on the inner side of the cast-in-situ counter-force wall. Has the advantages that: according to the invention, a group of extension frames with a step-shaped structure is added in the working pit of the stratum, and the extension frames are used for replacing the assembled jacking iron in the existing jacking process to serve as a force transmission mechanism, so that the influence of repeated installation of the jacking iron on the construction efficiency is solved, the stability of the jacking action of the oil cylinder on the socket pipe is increased, the distortion and the collapse risk of the multiple groups of jacking irons spliced end to end in the jacking process are avoided, and the construction safety and the construction efficiency are further improved.

Description

A ring-cut steel blade foot device for pipe jacking construction in soft ground and silt environment

technical field

The invention relates to the field of pipe jacking construction, in particular to a ring-cut steel blade foot device for pipe jacking construction in a soft ground silt environment.

Background technique

Pipe jacking construction is a construction technology for pipeline burial without excavation or less excavation. Specifically, in the working pit, with the help of the jacking force generated by the jacking equipment, the friction between the pipeline and the surrounding soil is overcome, the pipeline is pushed into the soil according to the designed slope, and the earth is transported away. After a section of the pipe is completely pushed into the soil layer, then The second section of the pipe continues to be jacked. The principle is to push the tool pipe from the working pit through the soil layer to the receiving pit with the help of the thrust of the main jacking cylinder. The pipe jacking construction is another development after the shield tunneling construction. An underground pipeline construction method, which does not need to excavate the surface layer, and can pass through roads, railways, rivers, ground buildings, underground structures and various underground pipelines, etc., so it has been widely used in recent years.

When the pipe jacking construction passes through the soft silt soil below the groundwater level, due to the soft ground structure and low bearing capacity, the formation is prone to uplift and subsidence during the implementation process, causing the pipe jacking to be deformed and damaged; During the jacking process, since the stroke of the oil cylinder is less than the length of the single-section socket pipe, it is necessary to install a jack iron to transmit the jacking force of the jacking jack in the actual jacking process. The specific operation is that the piston extends a working stroke and pushes the pipe into the soil layer for a certain After the distance, the oil return of the oil cylinder shrinks, add a set of top irons between the telescopic end of the oil cylinder and the socket pipe, repeat the extension action of the oil cylinder again and use the top iron to realize the next jacking action, so as to repeat the above operation. The cylinder extends the top iron that matches the stroke until it completely pushes a group of pipes into the soil layer. During the operation, the top iron needs to be disassembled frequently, and multiple sets of top irons are connected head-to-tail as the power transmission medium. In actual use, there are limitations. The risk of distortion or even collapse due to excessive force.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a ring-cut steel blade foot device for pipe jacking construction in a soft ground silt environment. By setting a multi-piece steel blade foot at the end of the socket pipe, the The jacking resistance during the jacking process of the socket pipe improves the construction efficiency and is easy to install. See below for details.

To achieve the above object, the present invention provides the following technical solutions:

The present invention provides a ring-cut steel knife foot device for pipe jacking construction in a soft ground silt environment, including a socket pipe and a steel knife foot assembly, and the steel knife foot assembly is arranged when the socket pipe penetrates into the formation At one end, two sets of support brackets are provided on the front and rear sides of the stratum to support the lateral movement of the intubation pipe, and a cast-in-place reaction wall is provided on the side of the stratum away from the steel blade foot assembly, and the cast-in-place reaction wall is provided on the inside There is a drive assembly for jacking the thrusting socket into the formation.

Using the above-mentioned ring-cut steel blade foot device for pipe jacking construction in a soft ground silt environment, when it is necessary to jack the socket pipe into the soil layer in a set direction, the cast-in-place reverse Force the wall and excavate the guide groove, install the guide assembly and the extension frame in the guide groove, ensure that the steel blade foot assembly at the end of the socket pipe is cut into the soil layer of the culvert during the jacking process of the socket pipe, and use the support frame The multiple sets of guide rollers guide the socket pipes that are hoisted to the end of the inner hole of the working pit, and then the oil cylinder is extended to push the buffer pad to push the protective plate and socket pipes into the culvert. After the maximum stroke is reached, the oil return from the oil cylinder guides the telescopic end to shrink, and at the same time, the motor drives the screw to rotate, and the screw drives the extension frame to move upwards, moving the first group of top plates on the top of the extension frame to between the telescopic end of the oil cylinder and the socket pipe. When the oil cylinder returns to the oil, extend again to realize the pipe jacking action, and use the top plate as the force transmission medium to realize the second socket pipe jacking action. After the oil cylinder is extended to the maximum stroke for the second time, the oil cylinder retracts and the extension frame continues Move up to the state where the second group of top plates are flush with the telescopic end of the oil cylinder, and operate according to the above steps, using multiple sets of stepped top plates as force transmission media in order to realize the periodic jacking action of the socket tube. After jacking into the culvert, send the next set of socket pipes into the working pit by lifting equipment to realize continuous jacking construction.

Preferably, the socket pipe is a reinforced concrete prefabricated pipe, an annular plug is provided at one end of the socket pipe close to the steel blade foot assembly, and a socket head for inserting a mating plug is provided at the other end of the socket pipe .

Preferably, the steel knife foot assembly includes three groups of arc-shaped steel plates, and the three groups of steel plates together form a ring that is tightened to the outer circumference of the intubation tube, and both sides of the steel plates are fixed with Channel steel extending in the direction.

As a preference, double rows of reinforcement bolts are fixedly connected between the two groups of channel steels adjacent to the joints of the steel plates, a sealing ring is sleeved at the joints between the outer side of the plug and the inner side of the steel plates, and the outer front end of the steel plates It is provided with a 45° edge bevel.

Preferably, a culvert for accommodating socket pipes is arranged laterally in the middle of the formation, and guide grooves extending laterally are provided on the formation between the two sets of support brackets, and the top surface of the formation is far away from the culvert by one An accommodating groove for accommodating the cast-in-situ reaction force wall is arranged on the side.

Preferably, the side of the cast-in-situ reaction force wall away from the socket pipe is provided with an L-shaped reaction force dispersion frame pressed against the ground, and the inner side of the reaction force dispersion frame is provided with right-angled triangle reinforcing ribs.

Preferably, the drive assembly includes multiple groups of oil cylinders arranged longitudinally and all fixed on the cast-in-place reaction wall. The telescoping ends of the multiple groups of oil cylinders are longitudinally fixed with buffer pads, and a buffer pad is arranged between the buffer pad and the socket pipe. There is a protective disk, and the protective disk is a ring-shaped structure.

As a preference, a guide assembly is provided at the bottom of the guide groove, an extension frame is provided at the top of the guide assembly, the guide assembly includes a C-shaped concrete bottom frame with an opening facing upward, and a guide block is arranged inside the concrete bottom frame, In addition, two sets of cross bars extending through the guide block are provided in parallel longitudinally inside the concrete bottom frame, and the guide block and the cross bar are horizontally slidingly matched.

As a preference, a C-shaped motor frame with an opening facing down is fixed on the top of the guide block, a motor is fixed inside the motor frame, and a screw that vertically passes through the motor frame is fixed at the output end of the motor top, and the screw Cooperating with the extension frame, two sets of vertical rods vertically penetrating into the extension frame to support the vertical sliding of the extension frame are arranged symmetrically on both sides of the screw rod.

Preferably, the top side of the extension frame is provided with multiple sets of stepped top plates, the transverse lengths of the multiple sets of top plates are equal and not greater than the telescopic stroke of the oil cylinder, the support bracket includes a horizontally extending beam, and the beam There are multiple groups of guide rollers that are evenly arranged on the top side and pressed against the outer circumference of the socket tube, the length direction of the guide rollers is tangent to the outer circumference of the socket tube, and the guide rollers are connected to the crossbeam Turn to fit.

Beneficial effects are: the present invention sets a multi-piece assembled steel blade foot at the end of the socket pipe, increases the support strength of the overall structure of the steel blade foot through the arc-shaped steel plate and the inner channel steel, and reduces the pressure of the socket pipe end. The contact area between the wall and the soil layer, thereby reducing the jacking resistance during the jacking process, improving the construction efficiency, and easy to install, overcomes the external force on the end of the pipeline during the jacking process, and ensures the overall rigidity and stability of the pipeline.

And add a set of extension frames with ladder structure in the working pit of the ground, use the extension frames to replace the existing assembled top irons in the jacking process as the force transmission mechanism, solve the impact of repeated installation of top irons on construction efficiency, and increase The stability of the jacking action of the oil cylinder to the socket pipe avoids the risk of distortion and collapse during the jacking process of the end-to-end splicing of multiple sets of jacking irons, and further improves the construction safety and construction efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a front view structural diagram of the present invention;

Fig. 2 is the three-dimensional structure schematic diagram of the present invention;

Fig. 3 is a schematic diagram of structural disassembly of the present invention;

Fig. 4 is a front sectional view of the present invention;

Fig. 5 is a schematic diagram of the structural disassembly of the steel knife foot assembly of the present invention;

Fig. 6 is a schematic diagram of structural disassembly of the steel blade foot assembly in another direction of the present invention;

Fig. 7 is a left view structural diagram of the steel blade foot assembly of the present invention;

Fig. 8 is a three-dimensional structural schematic view of the guide assembly of the present invention;

Fig. 9 is a schematic perspective view of the three-dimensional structure of the bracket of the present invention.

The reference signs are explained as follows:

1. Socket intubation; 101. Plug; 102. Sealing ring; 103. Bearing head; 2. Stratum; 201. Culvert; 202. Guide groove; 203. Accommodating groove; 301a, blade foot bevel; 302, channel steel; 303, reinforcement bolt; 4, protective plate; 401, convex edge; 5, support bracket; 501, beam; 502, guide roller; 6, cast-in-place reaction wall; 601. Reaction force dispersing frame; 602. Reinforcement rib; 7. Driving component; 701. Oil cylinder; 702. Cushion pad; 8. Extension frame; 801. Top plate; 9. Guide component; 901. Concrete bottom frame; 902. Cross bar ; 903, motor frame; 904, motor; 905, screw rod; 906, vertical rod; 907, guide block.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1-Fig. 9, the present invention provides a ring-cut steel knife foot device for pipe jacking construction in a soft ground silt environment, including a socket pipe 1 and a steel knife foot assembly 3, and the steel knife foot assembly 3 is set At the end where the socket pipe 1 penetrates into the stratum 2, the steel blade foot assembly 3 is used as the cutting soil feeding structure of the frontmost group of socket pipes 1, and is responsible for breaking the soil layer to guide the end-to-end connection of multiple sets of socket pipes on the rear side. 1, the front and rear sides of the formation 2 are provided with two sets of brackets 5 that support the lateral movement of the socket tube 1, and the brackets 5 are used to replace the slide plates in the existing jacking equipment to improve the movement of the socket tube 1. For convenience, the side of the stratum 2 away from the steel blade foot assembly 3 is provided with a cast-in-place reaction wall 6 , and the inner side of the cast-in-place counterforce wall 6 is provided with a drive assembly 7 for jacking the push-in socket 1 into the interior of the stratum 2 , the cast-in-place reaction wall 6 is used to support and fix the drive assembly 7 .

As an optional embodiment, the socket pipe 1 is a reinforced concrete prefabricated pipe, the end of the socket pipe 1 near the steel blade foot assembly 3 is provided with an annular plug 101, and the other end of the socket pipe 1 is provided with a mating plug for insertion. The socket head 103 of 101 is plugged and matched with the socket head 103 through the plug 101, so as to connect multiple groups of socket pipes 1 that are connected end to end and then sequentially pushed into the culvert 201. The steel blade foot assembly 3 includes three sets of arcs Shaped steel plate 301, three sets of steel plates 301 together form a ring that is tightened to the outer circumference side of the intubation tube, both sides of the steel plate 301 are fixed with channel steel 302 extending along the length direction of the socket tube 1, adjacent steel plates 301 are connected Two rows of reinforcement bolts 303 are fixedly connected between the two sets of channel steels 302 at the center, and the adjacent and tight channel steels 302 are locked and connected through the reinforcement bolts 303 to realize the assembly and combination process of the three sets of steel plates 301. The outside of the plug 101 A sealing ring 102 is sleeved at the inner side of the steel plate 301, and the sealing ring 102 is used to increase the sealing of the joint between the steel blade foot assembly 3 and the socket tube 1, and the outer front end of the steel plate 301 is provided with a 45° blade foot bevel 301a, using the outer side of the steel plate 301 as the edge groove 301a, thereby increasing the sharp effect of the outer edge of the steel plate 301 cutting and breaking the soil layer inside the culvert 201.

A culvert 201 for accommodating the socket pipe 1 is arranged laterally in the middle of the formation 2, a guide groove 202 extending transversely is provided on the formation 2 between the two sets of brackets 5, and a guide groove 202 is provided on the top surface of the formation 2 away from the culvert 201 to accommodate the pipe. Pouring the accommodation tank 203 of the reaction force wall 6, the cast-in-place reaction force wall 6 is cast into the interior and above the accommodation tank 203 through the formwork support, and the cast-in-place reaction force wall 6 is provided with a stopper on the side away from the socket pipe 1. The L-shaped counter force dispersion frame 601 on the formation 2, the inner side of the counter force dispersion frame 601 is provided with a right-angled triangle reinforcement rib 602, and the drive assembly 7 includes multiple sets of oil cylinders 701 arranged longitudinally and all fixed on the cast-in-place counter force wall 6, A buffer pad 702 is longitudinally fixed at the telescopic end of multiple groups of oil cylinders 701, and a protective disc 4 is arranged between the buffer pad 702 and the socket tube 1. 1. The internal convex edge 401 is used to increase the connection stability between the protective plate 4 and the socket tube 1 through the convex edge 401. Both the protective plate 4 and the buffer pad 702 are used to increase the stability of the oil cylinder 701 pushing the socket tube 1. The bottom of the guide groove 202 is provided with a guide assembly 9, and the top of the guide assembly 9 is provided with an extension frame 8. The guide assembly 9 includes a C-shaped concrete bottom frame 901 with the opening facing upwards. The concrete bottom frame 901 is poured in the guide groove, and the concrete bottom frame 901 is provided with a guide block 907, and the concrete bottom frame 901 is vertically and parallelly provided with two sets of cross bars 902 that pass through the guide block 907 transversely. The moving block 907 slides laterally, and the top of the guiding block 907 is fixed with a C-shaped motor frame 903 with the opening facing down. The motor frame 903 is fixed with a motor 904 inside, and the output end of the top of the motor 904 is fixed with a screw that passes through the motor frame 903 vertically. 905, the screw rod 905 is threadedly matched with the extension frame 8, two sets of vertical rods 906 vertically penetrate into the extension frame 8 to support the vertical sliding of the extension frame 8 are arranged symmetrically on both sides of the screw rod 905, and the top side of the extension frame 8 is provided with Multiple sets of top plates 801 distributed in a stepped manner, the transverse lengths of multiple sets of top plates 801 are equal and are not greater than the telescopic stroke of the oil cylinder 701, the support bracket 5 includes a transversely extending beam 501, and the top side of the beam 501 is uniformly provided with multiple sets of pressing to the The guide roller 502 on the outer circumference side of the socket tube 1, the length direction of the guide roller 502 is tangent to the outer circumference direction of the socket tube 1, and the guide roller 502 is rotatably matched with the beam 501, and the guide roller 502 is used to support the lateral movement of the socket tube 1 , to increase the smoothness and stability of the socket pipe 1 in the process of laterally tightening the soil layer.

With the above-mentioned structure, when it is necessary to jack the socket pipe 1 into the set direction in the soil layer, the cast-in-place reaction force wall 6 is pre-set in the working pit of the formation 2 and the guide groove 202 is excavated. Install the guide assembly 9 and the extension frame 8. During the jacking process of the socket pipe 1, ensure that the steel blade foot assembly 3 at the end of the socket pipe 1 cuts into the soil layer of the culvert 201, and utilize multiple sets of guide rollers of the support frame 5 502 guides the socket pipe 1 hoisted to the end of the inner hole 201 of the working pit, and then the oil cylinder 701 is extended to push the buffer pad 702 to push the protective plate 4 and the socket pipe 1 into the culvert 201, and the oil cylinder 701 stretches After the extension length reaches the maximum stroke, the oil cylinder 701 returns oil to guide the telescopic end to shrink, and at the same time, the motor 904 works to drive the screw 905 to rotate, and the screw 905 is used to drive the extension frame 8 to move upward, and the first group of top plates 801 on the top of the extension frame 8 are moved to Between the telescoping end of the oil cylinder 701 and the socket pipe 1, at this time, the oil cylinder 701 stretches out again after returning oil to realize the pipe jacking action, so as to realize the second jacking action of the socket pipe 1 with the help of the top plate 801 as the force transmission medium, and the oil cylinder 701 After extending to the maximum stroke for the second time, the oil cylinder 701 retracts while the extension frame 8 continues to move up to the state where the second set of top plates 801 are flush with the telescopic end of the oil cylinder 701. Operate according to the above steps, and use multiple sets of stepped top plates 801 in sequence As the force transmission medium, the periodic jacking action of the socket pipe 1 is realized. After a group of socket pipes 1 are completely pushed into the culvert 201, the next group of socket pipes 1 is sent into the working pit by lifting equipment, so as to realize continuous jacking. into construction.

By setting a multi-piece assembled steel blade foot at the end of the socket pipe 1, the support strength of the overall structure of the steel blade foot is increased through the arc-shaped steel plate 301 and the inner channel steel 302, and the distance between the wall and the wall at the end of the socket pipe 1 is reduced. The contact area of the soil layer reduces the jacking resistance during the jacking process, improves the construction efficiency, and is easy to install, overcomes the external force on the end of the pipeline during the jacking process, and ensures the overall rigidity and stability of the pipeline.

And add a set of extension frame 8 with ladder structure in the working pit of stratum 2, use the extension frame 8 to replace the existing assembled top iron in the jacking process as the force transmission mechanism, and solve the impact of repeated installation of the top iron on the construction efficiency , and increase the stability of the jacking action of the oil cylinder 701 to the socket pipe 1, avoid the risk of distortion and collapse during the jacking process of the end-to-end splicing of multiple sets of jacking irons, and further improve the construction safety and construction efficiency.

The applicant, China Water Conservancy and Hydropower Fourth Engineering Bureau Co., Ltd. implemented the structure of the present invention in the construction process of the rainwater and sewage pipeline project on No. 39 Road, Ganquanbao Industrial Park, Midong District, Urumqi. The designed rainwater and sewage pipeline passes through Xinjiang at K1+787 The d1000*2 source water pipeline of Guoneng Chemical Plant (made of glass fiber reinforced plastics, with a net distance between the pipes of 1.5 meters and a wall thickness of 0.12m), is about 2.1m away from the source water pipe with a soil covering thickness of about 2.1m. The site is class II non-self-weight collapsible and If there is groundwater exposure, use D1200 reinforced concrete (wall thickness 120mm) to jack pipes to cross the source water pipeline, and arrange light wells to dewater before the pipe jacking construction. The surrounding soil around the pipeline is stable. The section where the pipe jacking pipeline crosses is located in the soft silt soil below the groundwater level. During the implementation process, stratum uplift and subsidence are prone to occur, causing deformation and damage to the source water pipeline, resulting in extremely bad influences and large economic losses. Therefore, During pipe jacking operations, providing effective technical measures is the key to ensuring the stability of the formation and increasing the jacking speed.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. The utility model provides a push pipe construction circular cutting formula steel sword foot device under soft base silt environment which characterized in that: the steel cutting edge component (3) is arranged at one end, penetrating into a stratum (2), of the socket pipe (1), two groups of bearing brackets (5) for supporting the socket pipe (1) to transversely move are arranged on the front side and the rear side of the stratum (2), a cast-in-place reaction wall (6) is arranged on one side, far away from the steel cutting edge component (3), of the stratum (2), and a driving component (7) for pushing the socket pipe (1) to jack into the stratum (2) is arranged on the inner side of the cast-in-place reaction wall (6).

2. The pipe jacking construction circular cutting type steel blade device in the soft foundation silt environment according to claim 1, characterized in that: the socket pipe (1) is a prefabricated reinforced concrete pipe, one end of the socket pipe (1) close to the steel blade assembly (3) is provided with an annular plug (101), and the other end of the socket pipe (1) is provided with a socket head (103) for being inserted and matched with the plug (101).

3. The pipe jacking construction circular cutting type steel blade device in the soft foundation silt environment according to claim 2, characterized in that: the steel blade foot component (3) comprises three groups of arc-shaped steel plates (301), the three groups of steel plates (301) jointly form a circular ring hooped to the outer circumferential side of the insertion pipe, and channel steel (302) extending along the length direction of the socket pipe (1) are fixed on the two inner sides of each steel plate (301).

4. The pipe jacking construction circular cutting type steel blade device in the soft foundation silt environment according to claim 3, characterized in that: two rows of reinforcing bolts (303) are fixedly connected between two groups of channel steel (302) at the joint of the steel plates (301), a sealing ring (102) is sleeved at the joint of the outer side of the plug (101) and the inner side of the steel plate (301), and a 45-degree blade groove (301 a) is formed in the front end part of the outer side of the steel plate (301).

5. The pipe jacking construction circular cutting type steel blade device in the soft foundation silt environment according to claim 1, characterized in that: the construction structure is characterized in that a culvert (201) for accommodating the socket pipe (1) is transversely arranged in the middle of the stratum (2), a transversely extending guide groove (202) is arranged on the stratum (2) between the two groups of support brackets (5), and an accommodating groove (203) for accommodating the cast-in-place reaction wall (6) is arranged on one side, away from the culvert (201), of the top surface of the stratum (2).

6. The pipe jacking construction circular cutting type steel blade foot device in the soft foundation silt environment according to claim 5, characterized in that: an L-shaped reaction force dispersing frame (601) which is tightly propped against the stratum (2) is arranged on one side, away from the socket pipe (1), of the cast-in-place reaction force wall (6), and right-angled triangle reinforcing ribs (602) are arranged on the inner side of the reaction force dispersing frame (601).

7. The pipe jacking construction circular cutting type steel blade foot device in the soft foundation silt environment according to claim 6, characterized in that: the driving assembly (7) comprises a plurality of groups of oil cylinders (701) which are longitudinally arranged and fixed on the cast-in-place reaction wall (6), wherein a cushion pad (702) is longitudinally fixed at the telescopic end of each oil cylinder (701), a protection disc (4) is arranged between each cushion pad (702) and the socket pipe (1), and each protection disc (4) is of an annular structure.

8. The pipe jacking construction circular cutting type steel blade foot device in the soft foundation silt environment according to claim 7, characterized in that: the bottom in the guide groove (202) is provided with a guide assembly (9), the top of the guide assembly (9) is provided with an extension frame (8), the guide assembly (9) comprises a C-shaped concrete bottom frame (901) with an upward opening, a guide moving block (907) is arranged in the concrete bottom frame (901), two groups of transverse rods (902) transversely penetrating through the guide moving block (907) are longitudinally arranged in the concrete bottom frame (901) in parallel, and the guide moving block (907) is in transverse sliding fit with the transverse rods (902).

9. The pipe jacking construction circular cutting type steel blade foot device in the soft foundation silt environment according to claim 8, characterized in that: the top of the guide block (907) is fixed with a C-shaped motor frame (903) with a downward opening, a motor (904) is fixed in the motor frame (903), a screw rod (905) vertically penetrating through the motor frame (903) is fixed at the output end of the top of the motor (904), the screw rod (905) is in threaded fit with the extension frame (8), and two groups of vertical rods (906) vertically penetrating into the extension frame (8) to support the vertical sliding of the extension frame (8) are symmetrically arranged on two sides of the screw rod (905).

10. The pipe-jacking construction circular cutting type steel blade device in the soft foundation silt environment according to claim 9, characterized in that: extend frame (8) top side and be provided with roof (801) that the multiunit echelonment distributes, the horizontal length of multiunit roof (801) equals and all is not more than the flexible stroke of hydro-cylinder (701), hold bracket (5) including horizontal extension crossbeam (501), crossbeam (501) top side is transversely evenly provided with the multiunit and supports tightly reach deflector roll (502) of socket pipe (1) outer circumference side, deflector roll (502) length direction with the outer circumferencial direction of socket pipe (1) is tangent, just deflector roll (502) with crossbeam (501) normal running fit.

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