Device for construction of steel pipe within pipe jacking

Abstract

The utility model discloses a kind of steel pipe construction devices in pipe jacking, it is related to underground pipeline construction technical field.Device includes pipe clamp in working well, fixed frame in receiving well, steel wire rope and traction equipment, and push-pull collaborative force system balance is realized by closed loop traction system.Pipe clamp and the rear end of steel pipe to be worn pressure fit with, fixed frame and pipe clamp are respectively equipped with front and rear pulley, and steel wire rope connection forms closed loop.During traction, pipe clamp simultaneously applies lifting force and horizontal thrust, so that the pressure between steel pipe and casing bottom reduces, reduces friction and protects anticorrosive coating.The utility model solves the problem that coating is easily damaged, pipeline arch, welding crack and other problems in traditional construction, improves construction efficiency and safety, and is suitable for urban underground pipe network reconstruction crossing river and other scenes.

Description

Technical Field

[0001] This utility model belongs to the field of underground pipeline construction technology, specifically relating to the construction device and process method for internal steel pipe in pipe jacking construction, and is mainly applied to the construction of urban underground pipeline network renovation (such as reclaimed water, tap water, heating pipeline) crossing rivers and other scenarios. Background Technology

[0002] With the rapid advancement of urbanization, old urban areas in major cities are generally facing "urban ills" such as severe flooding, traffic congestion, and overhead "spider webs" of pipes. Underground pipeline renovation has become a key requirement for improving urban functions. Pipe jacking technology has become a core solution for laying underground pipelines in bustling urban areas, deep-buried pipelines, and pipelines crossing highways, railways, and rivers because it can achieve underground pipeline laying without interrupting traffic or damaging the surface environment.

[0003] The core advantages of pipe jacking construction technology are: minimal impact on ground traffic and the environment; the larger the pipe diameter and the deeper the burial depth, the more significant the economic and safety benefits compared to open-cut construction. Especially in special crossing scenarios, pipe jacking construction often becomes the only feasible technical means.

[0004] In pipe jacking construction, for scenarios where rigid pipelines such as reclaimed water, tap water, and heating pipe networks cross rivers, the industry generally adopts the process mode of "jacking the outer protective sleeve first, then inserting the steel pipe". That is, the outer protective sleeve is first installed in place by the pipe jacking machine, and then the inner functional steel pipe is inserted into the sleeve to achieve safe pipeline laying.

[0005] In traditional construction, the advancement of internal steel pipes relies on two classic structures: 1. Unidirectional jacking structure: Hydraulic jacks are installed in the working well to directly push the end face of the steel pipe so that it moves along the casing axis; 2. One-way dragging structure: A winch is installed in the receiving well, and the front end of the steel pipe is connected by a steel wire rope to drag it from the working well to the receiving well.

[0006] The aforementioned structure gradually matured in the 1980s and 1990s, solving the problem of damage to ground traffic and the environment caused by the early "open-cut pipe laying" method. It became the mainstream technology for urban underground pipe network construction and is still widely used in small and medium diameter pipe projects.

[0007] However, the existing pipe jacking construction technology for inserting steel pipes has significant drawbacks, specifically: 1. The outer anti-corrosion coating of the internal steel pipe is easily damaged: In traditional construction methods, the internal steel pipe has a large diameter and heavy weight. If the sand bedding layer is not spread evenly, the steel pipe and the bottom of the casing will directly contact and rub against each other, which can easily lead to damage to the outer anti-corrosion coating and affect the service life of the pipeline. 2. Pipe arching or weld cracking: When using jacking construction alone, if the frictional resistance between the end and the sleeve is too large, the concentrated thrust can easily cause the pipe to arch; when using pulling construction alone, if there are defects in the welding quality of the steel pipe joint, excessive pulling force can cause the weld to crack, leading to leakage risk. During unidirectional jacking, the steel pipe's own weight causes the middle section to sag, increasing friction with the bottom of the casing, resulting in scratches on the anti-corrosion coating in most projects; the jacking force is concentrated on the end face, causing longitudinal bending of the pipe, requiring secondary correction.

[0008] Existing technologies focus on the relationship between "single axial force output" and pipeline propulsion efficiency, without considering the bending moment effect formed by the jacking force and the pipeline's own weight. In contrast, this invention establishes a novel technical approach of "push-pull coordinated force system balance," which uses a reverse pulling force to offset the bending moment and achieve axial stability of the pipeline.

[0009] 3. Displacement or rolling of the inner pipe after end sealing: When the end filling and sealing is not tight, the impact of water flow and water pressure after water is turned on will cause the inner pipe to be displaced or even rolled in the sleeve, affecting the pipeline laying accuracy and operational stability.

[0010] The causes of the above defects are analyzed as follows: Existing technologies focus on the relationship between the application of "force in a single direction (axial force)" (pure jacking or pure pulling) and pipeline propulsion efficiency, without considering the dispersion and synergistic effect of force, or the bending moment effect formed by the jacking force and the pipeline's own weight.

[0011] In traditional construction, the jacking equipment and the pulling equipment operate independently, lacking mechanical balance design, which leads to stress concentration in local areas of the pipeline (such as the end or weld). Furthermore, without buffering or adjustment mechanisms, it is unable to cope with complex working conditions such as uneven sand cushion layer and changes in frictional resistance.

[0012] Necessity for Improvement: To address the problems of coating damage, pipe deformation, weld cracking, and end misalignment caused by traditional single-stage jacking or pulling construction, a new internal steel pipe construction technology is urgently needed. This technology can achieve coordinated force control, optimized process connections, and improved construction accuracy to compensate for the shortcomings of existing processes and ensure the safety and reliability of underground pipeline network renovation. This invention establishes a new technical approach of "push-pull coordinated force system balance," using a new structure to allow the tensile force to counteract the bending moment formed by the thrust and gravity, thus achieving axial stability of the pipe. Utility Model Content

[0013] The purpose of this utility model is to provide a construction device for inserting steel pipes into pipe jacking, which implements a new technical approach of "push-pull synergistic force system balance". The structure of the construction device ensures that the pulling force offsets the bending moment formed by the pushing force and gravity, thereby achieving axial stability of the pipeline and avoiding pipe arching or weld cracking.

[0014] To achieve the above objectives, the pipe jacking construction device of this utility model is used between the working shaft and the receiving shaft in pipe jacking construction. The pipe jacking that has been completed first is called the casing. The direction of the jacking construction is the forward direction. It includes a pipe clamp set in the working shaft, a fixing frame set in the receiving shaft, a steel wire rope and a traction device. The pipe clamp is press-fitted with the rear end of the steel pipe to be inserted, and the fixing frame is equipped with a front pulley and the pipe clamp is equipped with a rear pulley. One end of the wire rope is fixed to the lower part of the pipe clamp, and the other end passes through the front pulley and the rear pulley in sequence before being connected to the traction device, forming a closed-loop traction system.

[0015] The traction equipment is a winch or crane, set on the ground outside the working well; the pipe clamp is set vertically, and the bottom of the pipe clamp is fixedly connected to the lower slot, which is adapted to the wall thickness of the steel pipe to be inserted. After the steel pipe is inserted, the bottom end is clamped in the lower slot; the top of the pipe clamp is connected to the upper plate, which is clamped at the upper end of the steel pipe to be inserted.

[0016] The end of the wire rope connected to the pipe clamp is the force-applying end of the wire rope, and the end of the wire rope connected to the traction equipment is the force-receiving end of the wire rope. The wire rope has a movable buckle connected to the force-applying end, and a connecting ring is fixedly connected to the pipe clamp. The movable buckle is connected to the connecting ring to form a force transmission structure. In the connected state, it is used to transmit tension. Unlocking the movable buckle allows the steel pipe to be welded and extended.

[0017] The pipe clamp adopts a double-I-beam frame, which forms an inner cavity. The lower part of the double-I-beam frame has a front and rear through opening, and the rear pulley is located in the inner cavity of the double-I-beam frame at the opening. The front surface of the double-I-beam frame is provided with a rubber pad layer.

[0018] The fixing frame is a cubic frame structure welded from steel profiles. The size of the cubic frame structure is larger than the opening size of the casing extending into the receiving well. The front pulley is hinged to the bottom of the front frame of the cubic frame structure through a connecting frame, and the front pulley is located inside the cubic frame structure.

[0019] This utility model has the following advantages: This invention achieves a balanced push-pull force system through a closed-loop system consisting of a pipe clamp, a fixing frame, a steel wire rope, and a traction device. When the traction device tightens the steel wire rope, the front pulley changes the direction of the force, providing a forward pulling force. This allows the pipe clamp to simultaneously apply a lifting force and a horizontal forward thrust to the steel pipe, counteracting the bending moment formed by the combination of the simple backward thrust and gravity, thus preventing the steel pipe to be threaded from arching upwards. Under the lifting force, the pressure between the steel pipe to be threaded and the bottom of the casing and the sand pad is reduced, and even small local gaps may be formed, reducing frictional resistance and wear. Even if the sand pad is unevenly distributed, it can protect the anti-corrosion coating on the surface of the steel pipe to be threaded from damage.

[0020] Winches or cranes are common equipment on construction sites, making them convenient traction devices for the construction of the pipe jacking and steel pipe insertion device of this utility model. The lower clamping groove and upper clamping plate allow the pipe clamp to simply press the steel pipe to be inserted from back to front to clamp it together, preventing displacement between the two during operation.

[0021] The movable buckle and connecting ring allow for temporary disconnection of traction during steel pipe welding, making connection and disconnection convenient and quick, solving obstacles in process connection and improving construction efficiency.

[0022] The double-I-beam frame provides high-strength support, and the rear pulley allows for wire rope steering. The rear pulley is positioned within the inner cavity, thus protecting it from impacts by foreign objects and equipment at the working well. A rubber pad layer protects the steel pipe to be penetrated, preventing damage to its outer anti-corrosion coating. The cubic frame structure is larger than the opening size of the casing into the receiving well, which prevents the fixing frame from being pulled backward into the opening where the casing is located during operation. The fixing frame is supported by the surrounding soil of the opening, and forward tension is provided by the front pulley and steel wire rope. The front pulley is hinged to the fixing frame through a connecting frame, which can adapt to changes in the angle of the steel wire rope without causing damage to the connection structure.

[0023] During the traction process of the steel pipe to be pierced, the steel wire rope, under the combined action of its force-applying end, front pulley, rear pulley, pipe clamp, and traction equipment, achieves a balance of push and pull forces. This allows the pipe clamp to generate forward thrust on the steel pipe to be pierced while reducing the pressure of the steel pipe on the casing and sand cushion layer. As a result, friction between the steel pipe to be pierced and the bottom of the casing is reduced during the coordinated pulling and pushing process. Even if the sand cushion layer is not evenly distributed, the anti-corrosion coating of the steel pipe to be pierced is not easily damaged. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the present invention in use.

[0025] Figure 2 yes Figure 1 Top view.

[0026] Figure 3 yes Figure 1 CC section view.

[0027] Figure 4 yes Figure 2 DD sectional view.

[0028] Figure 5 yes Figure 1 BB cross-sectional view.

[0029] Figure 6This is a three-dimensional structural diagram of the present invention in use.

[0030] Figure 7 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure 8 yes Figure 3 Enlarged view of point B in the middle.

[0032] Figure 9 yes Figure 4 Enlarged view of point C in the middle.

[0033] Concentrated description of components or structures: 1. Pipe clamp 1.

[0034] Installation location: Inside the working well.

[0035] Structural relationship: The inner cavity is formed by a double-I-beam steel frame (model I20a, material Q355B), with front and rear open openings at the bottom and a rubber pad on the front surface; the bottom is connected to the lower card slot 8 and the top is connected to the upper card plate 9; the inner cavity is equipped with a rear pulley 7.

[0036] Working principle: By converting the tension of the steel wire rope 3, a lifting force and a horizontal forward thrust are simultaneously applied to the steel pipe, forming a balanced push-pull force system. This reduces the pressure at the bottom of the steel pipe and casing, reduces friction to protect the anti-corrosion coating, and prevents the pipe from arching or the weld from cracking.

[0037] 2. Fixture 2.

[0038] Installation location: Inside the receiving well.

[0039] Structural relationship: The cubic frame structure is welded from steel profiles (No. 10 channel steel), and its size is larger than the opening size of the casing 4 into the receiving well; the bottom is equipped with a nitrile rubber anti-slip pad (thickness 10mm, friction coefficient ≥0.8); the bottom of the front frame is hinged to the front pulley 6 through the connecting frame 12.

[0040] Working principle: It bears the backward tension of the steel wire rope 3, and is fixed by the surrounding soil of the opening (or by expansion bolts, which are not necessary components), providing a forward reverse tension. It forms a closed-loop traction system with the pipe clamp 1 to achieve force balance.

[0041] 3. Steel wire rope 3.

[0042] Installation location: Connect the pipe clamp 1, front pulley 6, rear pulley 7 and traction equipment to form a closed-loop system.

[0043] Structural relationship: One end is connected to the connecting ring 11 (force-applying end) of the pipe clamp 1 via the movable buckle 10, and the other end is connected to the traction device (force-receiving end) by passing through the front pulley 6 and the rear pulley 7 in sequence.

[0044] Working principle: When the traction device tightens, it changes the direction of the force through the pulley system, causing the pipe clamp 1 to generate lifting force and horizontal thrust. This transmits the pulling force, achieving a balance between the pushing and pulling forces, and driving the steel pipe forward.

[0045] 4. Sleeve 4.

[0046] Installation location: between the working shaft and the receiving shaft (on the outer protective pipe after the jacking construction is completed).

[0047] Structural relationship: A medium-coarse sand cushion layer is spread at the bottom, and the steel pipe 5 to be inserted is inserted into it.

[0048] Working principle: As a protective sleeve for the inner steel pipe (steel pipe 5 to be penetrated), it provides a construction passage. It protects the steel pipe 5 to be penetrated from the influence of the external environment and maintains the construction space.

[0049] 5. Steel pipe to be threaded.

[0050] Installation location: On the guide rail of the working well, inserted into the casing 4, and pushed into the casing 4 during construction.

[0051] Structural relationship: Multiple steel pipes are connected by welding, and the rear end is clamped to the lower slot 8 and upper plate 9 of the pipe clamp 1.

[0052] Working principle: The pipe advances along the guide rail by the thrust and lifting force of the clamp 1, and is welded and extended section by section until it is connected. As a functional pipeline, it is used to transport reclaimed water, tap water, heat media, or other functional purposes.

[0053] 6. Front pulley 6.

[0054] Installation location: bottom of the front frame of the mounting bracket 2 (hinged via the connecting bracket 12).

[0055] Structural relationship: Located within a cubic frame structure, steel wire rope 3 passes around its bottom.

[0056] Working principle: By changing the direction of force on the wire rope 3, the tension of the traction device is converted into a forward thrust. This reduces friction in the wire rope and achieves force balance through the coordination of the rear pulley 7 and the wire rope 3.

[0057] 7. Rear pulley 7.

[0058] Installation location: Inside the cavity at the lower opening of the pipe clamp 1.

[0059] Structural relationship: Wire rope 3 passes over its upper part to achieve steering.

[0060] Working principle: It works in conjunction with the front pulley 6 to change the direction of force, transmit tension, and also cause the pipe clamp 1 to generate lifting force. It guides the direction of the wire rope 3 and protects the pulley from external impacts during installation.

[0061] 8. Lower card slot 8.

[0062] Installation position: The bottom of the pipe clamp 1 extends forward.

[0063] Structural relationship: It is compatible with the wall thickness of the steel pipe 5 to be inserted, and is clamped to the bottom end of the steel pipe 5 after insertion.

[0064] Working principle: By clamping and fixing the rear end of the steel pipe, the lifting and pushing forces of the pipe clamp 1 are transmitted. This prevents relative displacement between the steel pipe and the pipe clamp 1, ensuring effective force transmission.

[0065] 9. Put on the card board 9.

[0066] Installation position: The top of the clamp 1 extends forward.

[0067] Structural relationship: The upper end of the clamp after the steel pipe 5 is inserted is fixed together with the lower clamp groove 8 to fix the steel pipe.

[0068] Working principle: The lower clamp 8 secures the steel pipe from above, ensuring relative stability and balanced force distribution between the steel pipe 5 to be threaded and the pipe clamp 1 during construction. This enhances the connection stability between the steel pipe 5 and the pipe clamp 1, preventing construction deviations.

[0069] 10. Activity card deduction 10.

[0070] Installation location: the tension end of wire rope 3.

[0071] Structural relationship: It is detachably connected to the connecting ring 11 on the pipe clamp 1.

[0072] Working principle: Tensile force is transmitted during connection, and welding extension of the steel pipe is allowed during unlocking. This enables rapid switching between traction (transmitting tensile force during connection) and welding (connecting a new steel pipe section during unlocking), improving construction efficiency.

[0073] 11. Connecting ring 11.

[0074] Installation location: on pipe clamp 1.

[0075] Structural relationship: It forms a force transmission structure in conjunction with the movable buckle 10.

[0076] Working principle: As the connection point between the wire rope 3 and the pipe clamp 1, it transmits tension. It ensures that the tension of the wire rope 3 is stably transmitted to the pipe clamp 1, thus maintaining the balance of the force system.

[0077] 12. Connecting bracket 12.

[0078] Installation location: Bottom of the front frame of bracket 2.

[0079] Structural relationship: hinged front pulley 6 and fixed frame 2.

[0080] Working principle: The front pulley 6 is allowed to rotate with the change of wire rope angle, avoiding structural damage. It adapts to the dynamic changes in the wire rope angle during construction, protecting the fixed frame 2 and the pulley.

[0081] 13. Soil 13.

[0082] Installation location: around sleeve 4.

[0083] Structural relationship: As the supporting base of the fixed frame 2, the top pressure fixed frame 2 is used to resist the backward pulling force.

[0084] Working principle: The reaction force of the fixing frame 2 is supported by soil friction and compressive strength. This provides stability to the fixing frame 2 and ensures the force balance of the closed-loop traction system.

[0085] 14. Guide rail, a conventional technology, not shown in the figure.

[0086] Installation location: bottom of the working well (along the jacking direction), with the front end located at the inlet of casing 4.

[0087] Structural relationship: Supports the steel pipe 5 to be threaded and provides a guide rail.

[0088] Working principle: Guides the steel pipe forward along the axial direction, reducing frictional resistance. Ensures precise pipe advancement and minimizes construction deviations.

[0089] 15. Sand cushion layer, a conventional technique, not shown in the figure.

[0090] Location: Bottom of casing 4 (medium-coarse sand paving).

[0091] Structural relationship: It serves as a temporary load-bearing layer for the steel pipe, evenly distributing the steel pipe's own weight.

[0092] Working principle: By using the buffering effect between particles, the direct friction between the steel pipe and the bottom of the casing is reduced. This protects the anti-corrosion coating on the steel pipe and reduces wear.

[0093] 16. Traction equipment, conventional technology, not shown in the figure.

[0094] Installation location: Ground outside the working well (winch or crane).

[0095] Structural relationship: Connects the force-bearing end of the steel wire rope 3, providing traction force.

[0096] Working principle: Tightening the steel wire rope 3 drives the pipe clamp 1 and the steel pipe forward through a closed-loop system. This provides construction power and controls the traction speed. Detailed Implementation

[0097] The steel pipe insertion device of this utility model is used between the working shaft and the receiving shaft in pipe jacking construction, such as... Figures 1 to 9As shown, the jacking pipe that is completed first is called casing 4, with the direction of jacking construction being the forward direction. In the attached drawing, reference numeral 13 indicates the soil surrounding casing 4.

[0098] It includes a pipe clamp 1 installed in the working well, a fixing frame 2 installed in the receiving well, a steel wire rope 3, and a traction device; The pipe clamp 1 is pressed against the rear end of the steel pipe 5 to be inserted. The fixing frame 2 is provided with a front pulley 6 and the pipe clamp 1 is provided with a rear pulley 7. One end of the wire rope 3 is fixed to the lower part of the pipe clamp 1, and the other end passes through the front pulley 6 and the rear pulley 7 in sequence before being connected to the traction device to form a closed-loop traction system.

[0099] This utility model achieves a balanced push-pull force system through a closed-loop system formed by "pipe clamp 1 - fixed frame 2 - steel wire rope 3 - traction device". When the traction device tightens the steel wire rope 3, the front pulley 6 changes the direction of the force and provides a forward pulling force, so that the pipe clamp 1 simultaneously applies a lifting force and a horizontal forward thrust to the steel pipe, which counteracts the bending moment formed by the combination of the simple backward thrust and gravity, and prevents the steel pipe 5 to be inserted from arching upward. Under the action of the lifting force, the pressure between the steel pipe 5 to be inserted and the bottom of the sleeve 4 is reduced, reducing frictional resistance and wear. Even if the sand pad layer inside the sleeve 4 is not evenly distributed, it can protect the anti-corrosion coating on the surface of the steel pipe 5 to be inserted from damage.

[0100] The traction equipment is a winch or crane, which is set on the ground outside the working well; the pipe clamp 1 is set vertically, and the bottom of the pipe clamp 1 is fixedly connected to the lower slot 8. The lower slot 8 is adapted to the wall thickness of the steel pipe 5 to be inserted. After the steel pipe 5 is inserted, the bottom end is clamped in the lower slot 8; the top of the pipe clamp 1 is connected to the upper plate 9, which is clamped at the upper end of the steel pipe 5 to be inserted.

[0101] Winches or cranes are commonly used equipment on construction sites and are conveniently used as traction devices in the construction device for inserting steel pipes into the pipe jacking system of this utility model (not shown in the figure). The lower clamping groove 8 and the upper clamping plate 9 allow the pipe clamp 1 to simply press the steel pipe 5 to be inserted from back to front to clamp it together, preventing displacement between the two during operation.

[0102] The end of the wire rope 3 connected to the pipe clamp 1 is the force-applying end of the wire rope 3, and the end of the wire rope 3 connected to the traction device is the force-receiving end of the wire rope 3. The wire rope 3 is connected to a movable buckle 10 at the force-applying end, and a connecting ring 11 is fixedly connected to the pipe clamp 1. The movable buckle 10 is connected to the connecting ring 11 to form a force transmission structure. In the connected state, it is used to transmit tension. Unlocking the movable buckle 10 is used to allow the steel pipe 5 to be threaded to be welded and extended.

[0103] The movable buckle 10 and connecting ring 11 allow for temporary disconnection of traction during steel pipe welding, making connection and disconnection convenient and quick, solving obstacles in process connection and improving construction efficiency. In the closed-loop system, the force-applying end of the wire rope 3 to the pipe clamp 1 and the axis of the front pulley 6 must be kept at approximately the same elevation to ensure coordinated force direction.

[0104] The pipe clamp 1 uses a double-I-beam frame, which forms an inner cavity. The lower part of the double-I-beam frame has a front and rear through opening, and the rear pulley 7 is located within the inner cavity of the double-I-beam frame at the opening. A rubber pad is provided on the front surface of the double-I-beam frame. The wire rope 3 passes through the opening, through the pipe clamp 1, and around the rear pulley 7, where it turns. The double-I-beam frame provides high-strength support, and the rear pulley 7 enables the wire rope 3 to turn. The rear pulley 7 is positioned within the inner cavity, thus protecting it from foreign objects and equipment at the working well. The rubber pad protects the steel pipe 5 to be penetrated, preventing damage to its outer anti-corrosion coating. The rubber pad is a conventional technology and is not shown in the figure. The double-I-beam is model I20a and made of Q355B material.

[0105] The fixing frame 2 is a cubic frame structure welded from steel profiles. The size of the cubic frame structure is larger than the opening size of the casing 4 into the receiving well. The front pulley 6 is hinged to the bottom of the front frame of the cubic frame structure via a connecting frame 12, and the front pulley 6 is located inside the cubic frame structure. An anti-slip pad is provided at the bottom of the cubic frame structure. The anti-slip pad is used to increase the friction with the bottom of the receiving well. The cubic frame is welded from No. 10 channel steel; the anti-slip pad is made of nitrile rubber, 10mm thick, with a friction coefficient ≥0.8.

[0106] The size of the cubic frame structure is larger than the opening size of the casing 4 into the receiving well. This prevents the fixing frame 2 from being pulled backward into the opening where the casing 4 is located during operation. The fixing frame 2 is supported by the surrounding soil of the opening, and forward tension is provided by the front pulley 6 and the steel wire rope 3. The front pulley 6 is hinged to the fixing frame 2 through the connecting frame 12, which can adapt to changes in the angle of the steel wire rope 3 without causing damage to the connection structure.

[0107] After the wire rope 3 is tightened, the fixing frame 2 bears the backward tension. The backward tension can be borne by the soil around the opening of the receiving well (the soil pushes the fixing frame 2 forward), or the fixing frame 2 can be fixed to the foundation at the bottom of the receiving well through expansion bolts to share the force on the soil around the opening.

[0108] This utility model also discloses a corresponding construction method, which uses the aforementioned pipe jacking and steel pipe insertion construction device, and includes the following steps: S1: Construction preparation: Install the pipe clamp 1 in the working well and the fixing frame 2 in the receiving well, and connect them with steel wire rope 3 to form a closed-loop traction system; install guide rails along the front-back direction (i.e., jacking direction) at the bottom of the working well (such as on a concrete foundation or steel support), with the front end of the guide rail located at the inlet of the casing 4. The guide rails are used to support the steel pipe 5 to be inserted and to guide and position the steel pipe 5 to be inserted and reduce friction; lay (spread) medium and coarse sand at the bottom of the casing 4 as a sand cushion layer; the guide rails are conventional technology and are not shown in the figure.

[0109] S2: Hoisting the first section of steel pipe to be threaded (5); The steel pipe 5 to be threaded is hoisted onto the guide rail of the working well, so that the lower slot 8 of the pipe clamp 1 is locked onto the bottom end of the steel pipe 5 to be threaded, and the upper clamp 9 is locked onto the upper end of the steel pipe 5 to be threaded. S3: The first section of steel pipe to be threaded is pulled by 5 tractions; Start the traction equipment to tighten the wire rope 3. At the same time, the pipe clamp 1 applies lifting force and horizontal forward thrust to the steel pipe 5 to be pierced, reducing the pressure between the steel pipe 5 to be pierced and the bottom of the casing 4, reducing frictional resistance and reducing wear. The steel pipe 5 to be pierced moves towards the receiving well until the steel pipe 5 to be pierced is pushed to the point where the exposed part of its rear end behind the casing 4 is 50 cm. Then stop the traction and execute step S4. S4: Welding inspection: After stopping the traction of the previous section of steel pipe 5 to be threaded, the bottom of the steel pipe 5 to be threaded is supported by the sand pad layer at the bottom of the sleeve 4, and the movable buckle 10 is unlocked (opened); The new section of steel pipe 5 to be threaded is hoisted onto the guide rail of the working well, so that the lower slot 8 of the pipe clamp 1 is locked on the bottom rear end of the section of steel pipe 5 to be threaded, and the upper clamping plate 9 is locked on the upper rear end of the section of steel pipe 5 to be threaded. Weld a new section of steel pipe 5 to be threaded to the rear end of the previous section of steel pipe 5 and perform flaw detection. After the flaw detection is qualified, proceed to step S5. Step S5 is the subsequent traction of the steel pipe to be threaded; The traction equipment is started to tighten the wire rope 3. At the same time, the pipe clamp 1 applies a lifting force and a horizontal forward thrust to the steel pipe 5 to be penetrated, so that the pressure between the new steel pipe 5 to be penetrated and the bottom of the casing 4 is reduced, reducing frictional resistance and wear. The new steel pipe 5 to be penetrated moves towards the receiving well until the rear end of the pipe 5 is 50 cm exposed behind the casing 4. The traction is then stopped, and the new steel pipe 5 to be penetrated becomes the previous steel pipe 5 to be penetrated. Repeat steps S4 and S5 until the steel pipe 5 to be drilled passes through the casing 4, and is then passed from the working shaft to the receiving shaft, completing the construction of drilling the steel pipe inside the jacking pipe.

[0110] During the pulling process of the steel pipe 5 to be threaded, the steel wire rope 3, under the combined action of its force-applying end, the front pulley 6, the rear pulley 7, the pipe clamp 1, and the traction equipment, achieves a balance of push and pull forces. This allows the pipe clamp 1 to generate a forward thrust on the steel pipe 5 to be threaded while reducing the downward pressure of the steel pipe 5 on the casing 4. As a result, the friction between the bottom of the steel pipe 5 and the casing 4 is reduced during the pull and push process. Even if the sand pad layer is not evenly distributed, the anti-corrosion coating of the steel pipe 5 to be threaded is not easily damaged.

[0111] The preferred traction speed in this construction method is 0.5-1 m / min. After the welding of the steel pipe 5 is completed, 100% ultrasonic testing (UT) should be performed, and a medium-coarse sand pad should be placed at the base of the sleeve 4. During the traction process of the steel pipe 5, the lifting height of the steel pipe 5 should be 15-30 mm to reduce friction.

[0112] The above construction methods are further specified and described in more detail below: I. Construction preparation stage.

[0113] After casing 4 is installed, a working platform is first erected, including a cubic fixing frame 2 (with built-in front pulley 6) welded from steel sections installed in the receiving well, and a pipe clamp 1 (with built-in rear pulley 7) with a double-I-beam steel frame placed in the working well, all connected by steel wire rope 3 to form a closed-loop traction system. The bottom of the fixing frame 2 is equipped with a nitrile rubber anti-slip pad (friction coefficient ≥0.8) to enhance stability; the front end of the pipe clamp 1 is equipped with a rubber pad to prevent damage to the outer anti-corrosion coating of the steel pipe. Simultaneously, guide rails are installed at the bottom of the working well along the jacking direction, and a medium-coarse sand pad is spread at the bottom of casing 4 to provide guidance and buffer support for the steel pipe 5 to be inserted.

[0114] Working principle: The pulley system of the fixed frame 2 and the pipe clamp 1 changes the direction of force on the wire rope 3, forming a "push-pull synergistic force system" - when the traction device tightens the wire rope 3, the front pulley 6 provides forward pulling force, and the pipe clamp 1 simultaneously applies horizontal pushing force and lifting force, which reduces the pressure between the bottom of the steel pipe and the sleeve 4 and reduces frictional resistance; when the wire rope 3 is loosened, the steel pipe falls back to the sand cushion layer, and the sand cushion layer supports its own weight, avoiding continuous friction damage to the coating.

[0115] During the construction preparation phase, a closed-loop system is constructed in advance to ensure the balance of forces during subsequent construction, thereby reducing coating wear problems caused by uneven sand cushion layers in traditional construction from the source.

[0116] II. Hoisting and pulling of the first section of steel pipe.

[0117] Lifting and positioning: The first section of steel pipe 5 to be threaded is lifted and placed onto the guide rail of the working well by the double-point sling, so that the lower slot 8 and the upper plate 9 of the pipe clamp 1 respectively clamp the bottom and top ends of the steel pipe to achieve rigid fixation.

[0118] Closed-loop traction start-up: Start the winch or crane to tighten the wire rope 3. Through the coordinated action of the rear pulley 7 (pipe clamp 1) and the front pulley 6 (fixed frame 2), the pipe clamp 1 applies a horizontal thrust and lifting force to the steel pipe 5 to be penetrated, and the steel pipe moves forward along the guide rail towards the receiving well. At this time, part of the weight of the steel pipe 5 to be penetrated is borne by the lifting force applied by the pipe clamp 1, which significantly reduces the friction between the steel pipe 5 to be penetrated and the casing 4 and the sand cushion layer, protecting the anti-corrosion coating.

[0119] Precise stopping: When the rear end of the steel pipe protrudes 50cm from the working well, traction is stopped, at which point the bottom of the steel pipe is fully supported by the sand cushion layer.

[0120] Working Principle: Utilizing the high-strength support of the double-I-beam pipe clamp 1 (model I20a, material Q355B), combined with the tension conversion of the steel wire rope 3, the single traction force is transformed into a composite force of "lifting force + pushing force," offsetting the bending moment generated by the steel pipe's own weight, avoiding the pipe arching phenomenon in traditional jacking construction, and reducing friction. Through the cycle of "lifting force - pushing force - temporary load," the steel pipe is moved forward without damage, solving the problem of coating scratches caused by continuous friction in traditional dragging construction.

[0121] III. Steel pipe welding and inspection.

[0122] Unlocking and docking: Open the movable buckle 10 on the pipe clamp 1, disconnect the steel wire rope 3 from the pipe clamp 1, hoist the new steel pipe section to the guide rail, and repeat the positioning steps to align the new pipe with the previous steel pipe section.

[0123] Welding and flaw detection: Multi-layer, multi-pass manual arc welding is used. After welding on one side of the double-sided weld, carbon arc gouging is used to clean the root. Two people weld symmetrically to offset deformation. After welding, 100% ultrasonic testing (UT, in accordance with GB / T11345-2013 Class B standard) is performed to ensure weld quality.

[0124] Working principle: The movable buckle 10 design enables rapid separation and connection between the wire rope 3 and the pipe clamp 1, solving the problem of dismantling the entire traction device during welding in traditional construction. The symmetrical welding process reduces welding stress and avoids the risk of weld cracking. The welding inspection process is seamlessly integrated with the traction process, improving construction efficiency. Ultrasonic testing reduces the risk of leakage and solves the problem of easy weld cracking in traditional traction construction.

[0125] IV. Cyclic construction and connection.

[0126] After the welding inspection is passed, the wire rope 3 is reconnected to the pipe clamp 1, and the traction equipment is started to repeat the process of "tightening the wire rope 3 - lifting and pushing - stopping when 50cm is exposed" to move the new section of steel pipe forward. The "welding-inspection-traction" steps are repeated until all steel pipes pass through the casing 4 and extend from the working well to the receiving well.

[0127] Working Principle: By employing a "segmented traction + section-by-section welding" approach, long-distance steel pipe crossings are broken down into controllable short sections for construction. The closed-loop system's force balance continuously protects the steel pipe coating and structural stability. The design of exposing 50cm after each traction provides operational space for welding while preventing excessive forward movement of the pipe to be traversed, thus avoiding accumulated deviations. There is no forced pushing or dragging throughout the process, and the steel pipe's axial deviation is controlled within ±10mm, solving the problems of pipe misalignment or rolling encountered in traditional construction. The standardized cyclic process is particularly suitable for large-diameter, long-distance crossing scenarios, such as complex scenarios involving urban underground pipe networks crossing rivers or railways.

[0128] V. Synergistic effect.

[0129] Closed-loop traction system: The pulley system of the fixed frame 2 and the pipe clamp 1 forms a closed-loop force system. The tension of the wire rope 3 and the thrust of the pipe clamp 1 are balanced in real time to counteract the bending moment of the steel pipe's own weight and prevent arching or sinking.

[0130] The movable buckle 10 and the double-I-beam structure: The movable buckle 10 enables rapid switching between traction and welding processes, while the double-I-beam pipe clamp 1 balances high strength and corrosion protection, resolving the contradiction between "rigid propulsion easily damages the coating" and "low efficiency of flexible traction".

[0131] Sand cushion layer and guide rail combination: The guide rail guides and ensures the accuracy of the axis, while the sand cushion layer buffers temporary load. The combination of the two reduces the need for secondary correction during construction.

[0132] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pipe jacking device for inserting steel pipes, used between the working shaft and the receiving shaft in pipe jacking construction, wherein the jacking pipe that has been completed first is referred to as the casing, and the direction of jacking construction is taken as the forward direction, characterized in that: This includes a pipe clamp installed in the working well, a fixing frame installed in the receiving well, a steel wire rope, and a traction device; The pipe clamp is press-fitted with the rear end of the steel pipe to be inserted, and the fixing frame is equipped with a front pulley and the pipe clamp is equipped with a rear pulley. One end of the wire rope is fixed to the lower part of the pipe clamp, and the other end passes through the front pulley and the rear pulley in sequence before being connected to the traction device, forming a closed-loop traction system.

2. The pipe jacking and steel pipe insertion construction device according to claim 1, characterized in that: The traction equipment is a winch or crane, set on the ground outside the working well; the pipe clamp is set vertically, and the bottom of the pipe clamp is fixedly connected to the lower slot, which is adapted to the wall thickness of the steel pipe to be inserted. After the steel pipe is inserted, the bottom end is clamped in the lower slot; the top of the pipe clamp is connected to the upper plate, which is clamped at the upper end of the steel pipe to be inserted.

3. The pipe jacking and steel pipe insertion construction device according to claim 2, characterized in that: The end of the wire rope connected to the pipe clamp is the force-applying end of the wire rope, and the end of the wire rope connected to the traction equipment is the force-receiving end of the wire rope. The wire rope has a movable buckle connected to the force-applying end, and a connecting ring is fixedly connected to the pipe clamp. The movable buckle is connected to the connecting ring to form a force transmission structure. In the connected state, it is used to transmit tension. Unlocking the movable buckle allows the steel pipe to be welded and extended.

4. The pipe jacking and steel pipe insertion construction device according to claim 1, characterized in that: The pipe clamp adopts a double-I-beam frame, which forms an inner cavity. The lower part of the double-I-beam frame has a front and rear through opening, and the rear pulley is located in the inner cavity of the double-I-beam frame at the opening. The front surface of the double-I-beam frame is provided with a rubber pad layer.

5. The pipe jacking and steel pipe penetration construction device according to any one of claims 1 to 4, characterized in that: The fixing frame is a cubic frame structure welded from steel profiles. The size of the cubic frame structure is larger than the opening size of the casing extending into the receiving well. The front pulley is hinged to the bottom of the front frame of the cubic frame structure through a connecting frame, and the front pulley is located inside the cubic frame structure.

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