A retractable pipe jacking construction device and construction method

Abstract

This invention discloses a retractable pipe jacking construction device and method, including a foldable reaming blade connected to the pipe jacking machine cutterhead for expanding the borehole and a towing device for pulling back the pipe jacking machine. The foldable reaming blade includes: a reaming blade for increasing the borehole diameter of the pipe jacking machine, the reaming blade being hinged to the pipe jacking machine cutterhead; and a limiting plate for controlling the folding angle of the reaming blade. This invention utilizes the construction pipeline as an outer shield, realizing retractable pipe jacking construction with a conventional pipe jacking machine. It eliminates the need for a steel outer shield in the soil, the need to increase the size of the working shaft, and the need for a receiving shaft. By adjusting the pipe jacking machine fixing device, the limiting sealing device, and the size of the foldable reaming blade, it can be applied to jacking construction of various pipe diameters. This invention is beneficial for realizing retractable pipe jacking construction without a receiving shaft using a conventional pipe jacking machine, ensuring safety and efficiency, while eliminating the need for additional costs such as purchasing a new pipe jacking machine, a steel outer shield, and foundation pit support, resulting in significant technical and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and in particular to a retractable pipe jacking construction device and construction method. Background Technology

[0002] Pipe jacking machines are widely used in pipeline jacking construction in highways, railways, municipal works, and building construction due to their advantages such as minimal impact on the surrounding environment, wide adaptability to geological conditions, safety and reliability, easy control of jacking accuracy, and high construction efficiency.

[0003] Pipe jacking machines typically include a cutterhead, shield, power unit, discharge device, and correction device. During the jacking process, the power unit drives the cutterhead to cut and mix the soil, and the soil or slurry is discharged through the discharge device. The extended pipe sections are then jacked forward in the working shaft until the pipe jacking machine reaches the receiving shaft.

[0004] To achieve retractable construction without a receiving shaft, existing pipe jacking machines are typically designed to consist of an inner shield and an outer shield. An outer shield is added to the outside of the pipe jacking machine, while the inner shield is equivalent to a conventional pipe jacking machine. When the pipe jacking machine retracts, the mechanical connection between the inner and outer shields is released, and the outer shield remains in place to support the soil. The inner shield is disassembled and towed back, or the inner shield and cutterhead are towed back to the working shaft directly, without the need for a receiving shaft.

[0005] However, these types of pipe jacking machines are generally designed for pipes of a specific diameter. When the pipe diameter changes, a new pipe jacking machine needs to be replaced or redesigned. Moreover, these pipe jacking machines are generally quite long, requiring the design of longer working shafts, which increases the workload of the support structure. In addition, the outer shield of the pipe jacking machine is usually made of thick-walled steel pipe, which is left in the soil, also incurring significant costs. Considering all these factors, the use of these types of pipe jacking machines in small-scale pipe jacking projects is often severely limited due to their high cost.

[0006] Therefore, the application scope of existing pipe jacking machines is greatly limited, which is not conducive to achieving the optimal combination of retractable pipe jacking construction and engineering economy and construction safety, and makes it difficult to promote them in small-scale pipe jacking construction. Summary of the Invention

[0007] To address the shortcomings in the aforementioned background technology, this invention proposes a retractable pipe jacking construction device and construction method, which solves the problem that existing pipe jacking machines are not conducive to retraction.

[0008] The technical solution of this invention is implemented as follows:

[0009] A retractable pipe jacking construction device for a pipe jacking machine includes a foldable reaming blade connected to the cutterhead of the pipe jacking machine for reaming holes and a towing device for pulling back the pipe jacking machine; the foldable reaming blade includes:

[0010] A reaming blade used to enlarge the borehole diameter of a pipe jacking machine; the reaming blade is hinged to the cutter head of the pipe jacking machine.

[0011] A limiting plate attached to the reaming blade is used to control the folding angle of the reaming blade.

[0012] Furthermore, it also includes a fixing device for connecting the construction pipeline to the pipe jacking machine.

[0013] Furthermore, the pipe jacking machine fixing device includes:

[0014] Welding the ear plates to the outer wall of the pipe jacking machine;

[0015] A clamping plate that is fixed at the location of the construction pipe joint;

[0016] The connecting ear plate and clamping plate are used to fix the radial position of the pipe jacking machine and provide forward support force for the pipe jacking machine.

[0017] Furthermore, it also includes limiting and sealing devices installed on the construction pipeline and the pipe jacking machine.

[0018] Furthermore, the limiting sealing device includes:

[0019] A limiting sealing plate connected to the pipe jacking machine to provide radial support to the end of the machine and resist water and soil pressure;

[0020] Limiting anchor bolts that connect the limiting sealing plate to the construction pipeline and provide longitudinal support to the limiting sealing plate.

[0021] Furthermore, the outer and inner diameters of the limiting sealing plate are respectively matched with the inner diameter of the construction pipeline and the outer diameter of the pipe jacking machine.

[0022] Furthermore, it also includes rollers installed on the middle and bottom of the outer wall of the pipe jacking machine.

[0023] A construction method for a retractable pipe jacking construction device as described in any of the above claims includes the following steps:

[0024] Install construction pipelines and pipe jacking machines inside the working shaft;

[0025] Use a pipe jacking machine to excavate the construction pipeline to the designed location;

[0026] Loosen the connecting bolts of the pipe jacking machine fixing device and use the towing device to tow the pipe jacking machine back to the working well.

[0027] Furthermore, it also includes the following steps:

[0028] Rollers are installed at the middle and bottom of the outer wall of the pipe jacking machine to limit the radial position of the pipe jacking machine, thereby reducing the resistance between the pipe jacking machine and the construction pipeline when it is pulled back.

[0029] The towing device connected to the tail of the pipe jacking machine, through connection with the traction rope, tows the pipe jacking machine and the components fixed to the pipe jacking machine back to the working shaft.

[0030] Furthermore, it also includes the following steps:

[0031] The angle of the expanding blade after folding and retracting is controlled by controlling the installation angle of the limiting plate. At this angle, the expanding blade does not need to be manually flipped and unfolded, and can unfold on its own under the action of the oncoming earth pressure. At the same time, at this angle, the outer diameter of the expanding blade after folding and retracting is smaller than the outer diameter of the pipe jacking machine, ensuring that it can enter the construction pipeline for easy removal.

[0032] The outer diameter of the expanded borehole blade is equal to or slightly larger than the outer diameter of the construction pipe, so that the excavated outline area is equal to or slightly larger than the outer diameter of the construction pipe, thus reducing the resistance when the construction pipe is jacked up.

[0033] The beneficial effects of this invention are as follows: This invention utilizes the construction pipeline as an outer shield, enabling retractable pipe jacking construction with conventional pipe jacking machines. This expands the application range of conventional pipe jacking machines without requiring the manufacture or purchase of new pipe jacking machines, the placement of a steel outer shield within the soil, an increase in the size of the working shaft, or the installation of a receiving shaft. By adjusting the size of the pipe jacking machine's fixing device, limiting sealing device, and foldable borehole expander blades, it can be applied to jacking construction of various pipe diameters. This invention is beneficial for enabling retractable pipe jacking construction without a receiving shaft using conventional pipe jacking machines, ensuring safety and efficiency, while eliminating the need for additional costs such as purchasing new pipe jacking machines, steel outer shields, and foundation pit support. The technical and economic benefits are significant. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a longitudinal section layout diagram of the jacking system in the jacking state in an embodiment of the present invention;

[0036] Figure 2 As described in the embodiments of the present invention Figure 1 A magnified view of part A in the image;

[0037] Figure 3 As described in the embodiments of the present invention Figure 1 B-B cross-section view in the middle;

[0038] Figure 4 As described in the embodiments of the present invention Figure 1 C-C cross-section view;

[0039] Figure 5 As described in the embodiments of the present invention Figure 1 D-D cross-section view in the middle;

[0040] Figure 6 As described in the embodiments of the present invention Figure 5 Enlarged view of part F in the image;

[0041] Figure 7 This is a longitudinal section view of the pipe jacking machine in the pullback state in an embodiment of the present invention;

[0042] Figure 8 As described in the embodiments of the present invention Figure 7 E-E cross-section view. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figures 1-8 As shown in Embodiment 1 of the present invention, a retractable pipe jacking construction device includes a pipe jacking machine 1, a construction pipeline 2, a pipe jacking machine fixing device 3 connecting the pipe jacking machine 1 and the construction pipeline 2, a sealing device 4 for sealing the pipe jacking machine 1 and the construction pipeline 2, a foldable reaming blade 5 fixed to the cutter head 8 of the pipe jacking machine for reaming, a towing device 7 for pulling back the pipe jacking machine 1, and rollers 6 for facilitating the movement of the pipe jacking machine 1.

[0045] like Figure 1 and Figure 2 as well as Figure 7 As shown, the foldable reaming blade 5 includes: a reaming blade 51, a limiting plate 53, a connecting ring 52, a connecting pin 55, and a connecting plate 54 welded to the pipe jacking machine cutterhead 8. The reaming blade 51 is used to enlarge the drilling diameter of the pipe jacking machine 1. Multiple reaming blades 51 are provided. The reaming blades 51 are evenly distributed at equal angles around the axis of the pipe jacking machine cutterhead 8, and one end of the reaming blade 51 is hinged to the pipe jacking machine cutterhead 8, while the other end is set towards the well wall of the installation well.

[0046] Specifically, such as Figure 2 , Figure 5 and Figure 6As shown, the connecting plate 54 is welded to the cutter head 8 of the pipe jacking machine, and the connecting ring 52 is connected to the reaming blade 51 and cooperates with the connecting plate 54. The connecting pin 55 passes through the connecting ring 52 and the connecting plate 54 to hinge the reaming blade 51 to the cutter head 8 of the pipe jacking machine. The limiting plate 53 is connected to the connecting ring 52 to control the folding angle of the reaming blade 51. The limiting plate 53 rotates with the rotation of the connecting ring 52. The limiting plate 53 is movably connected to the connecting ring 52 so that the included angle between the limiting plate 53 and the reaming blade 51 is adjustable, thereby controlling the angle of rotation of the reaming blade 51 around the hinge point, thereby controlling the size of the outer contour after the multiple reaming blades 51 rotate inward and retract. Specifically, the limiting plate 53 can be connected to the connecting ring 52 by bolts. The connecting ring 52 and / or the limiting plate 53 are provided with multiple bolt holes so that the position of the limiting plate 53 on the connecting ring 52 is adjustable, thereby making the included angle between the limiting plate 53 and the reaming blade 51 adjustable.

[0047] like Figure 7 As shown, the angle of the expanding blade 51 after rotation and folding is controlled by controlling the installation angle of the limiting plate 53. At this angle, the expanding blade 51 does not need to be manually rotated and unfolded, and can unfold on its own under the action of the oncoming earth pressure. At the same time, at this angle, the outer diameter of the expanded blade 51 after folding and shrinking is smaller than the outer diameter of the pipe jacking machine 1, ensuring that it can enter the construction pipeline 2 for easy retraction. Of course, the number and specific structure of the foldable expanding blade 5, as well as the connection method with the pipe jacking machine cutter head 8, are not limited to this. They can be appropriately adjusted according to the diameter of the construction pipeline 2 and the structural form of the pipe jacking machine cutter head 8. However, it must be ensured that the setting of the foldable expanding blade 5 can make the pipe jacking machine cutter head 8 evenly stressed, and that the foldable expanding blade 5 can enter the construction pipeline 2 after folding when the pipe jacking machine 1 retracts.

[0048] The outer diameter of the expanded hole-reaming blade 51 is equal to or slightly larger than the outer diameter of the construction pipe 2, so that the excavated outline area is equal to or slightly larger than the outer diameter of the construction pipe 2, thereby reducing the resistance when the construction pipe 2 is pushed forward.

[0049] Example 2 differs from Example 1 in that, as Figure 1 , Figure 3 and Figure 7 As shown, the pipe jacking machine fixing device 3 includes: ear plates 32 welded to the outer wall of the pipe jacking machine 1, clamping plates 31 fixed at the joint position of the construction pipeline 2, and connecting bolts 33 connecting the ear plates 32 and the clamping plates 31; the connecting bolts 33 are used to fix the radial position of the pipe jacking machine 1 and provide forward support force for the pipe jacking machine 1. In this example, it is preferable to set the clamping plates 31 at the joint position of the construction pipeline 2 to fix and support the pipe jacking machine 1. Of course, the connection method between the pipe jacking machine 1 and the construction pipeline 2 is not limited to this.

[0050] Example 3 differs from Example 1 in that, as Figure 1 , Figure 2 and Figure 4 As shown, the limiting sealing device 4 includes: a limiting sealing plate 42 connected to the pipe jacking machine 1 to provide radial support force to the end of the pipe jacking machine 1; and limiting anchor bolts 41 connected to the limiting sealing plate 42 and the construction pipeline 2. The limiting anchor bolts 41 are evenly arranged radially along the construction pipeline 2 and fixed to the construction pipeline 2, providing longitudinal support force to the limiting sealing plate 42. The limiting sealing plate 42 has a certain thickness to resist water and soil pressure, thus playing a sealing role and providing radial support force to the end of the pipe jacking machine 1. The outer diameter and inner diameter of the limiting sealing plate 42 are respectively matched with the inner diameter of the construction pipeline 2 and the outer diameter of the pipe jacking machine 1. Of course, the limiting sealing plate 42 can be made of suitable materials, and the connection method with the construction pipeline 2 is not limited to this.

[0051] Example 4 differs from Example 1 in that, as Figure 1 and Figure 8 As shown, rollers 6 are installed in the middle and bottom of the outer wall of the pipe jacking machine 1. They can limit the radial position of the pipe jacking machine 1 and reduce the resistance between the pipe jacking machine 1 and the construction pipeline 2 when it is pulled back. Of course, in addition to using rollers 6, other forms such as slide rails can also be used to reduce resistance.

[0052] Example 5 differs from Example 1 in that, as Figure 1 As shown, the towing device 7 connected to the tail of the pipe jacking machine 1, through connection with the traction rope 9, tows the pipe jacking machine 1 and the components fixed to the pipe jacking machine 1 back to the working well.

[0053] Therefore, this method is beneficial for conventional pipe jacking machines to achieve retractable pipe jacking construction when there is no receiving well, without the need for excessive additional investment, ensuring safety and high tunneling efficiency, and resulting in significant technical and economic benefits.

[0054] Example 6: A construction method for a retractable pipe jacking construction device includes the following steps:

[0055] Step 1: Install construction pipe 2 and pipe jacking machine 1 inside the working shaft;

[0056] According to the pipeline design route, a working shaft is set up at a suitable location. Then, the construction pipeline 2, pipe jacking machine 1, pipe jacking machine fixing device 3, limit sealing device 4, foldable borehole expander blade 5, and other supporting components and pipelines of pipe jacking machine 1 are installed at the starting position. Next, the components and systems of pipe jacking machine 1 are debugged to ensure stable and reliable operation before jacking begins.

[0057] Step 2: Use pipe jacking machine 1 to excavate the pipeline to the designed location;

[0058] Operate pipe jacking machine 1 to excavate and assemble extended construction pipe sections until pipe jacking machine 1 reaches the designed position and stops jacking.

[0059] Step 3: After the pipe jacking machine 1 stops working, release the connecting bolts 33 of the pipe jacking machine fixing device 3, and use the towing device 7 to tow the pipe jacking machine 1 back to the working shaft. The pipe jacking is then completed.

[0060] Among them, rollers 6 are installed in the middle and bottom of the outer wall of the pipe jacking machine 1 to limit the radial position of the pipe jacking machine 1, thereby reducing the resistance between the pipe jacking machine 1 and the construction pipeline 2 when it is pulled back.

[0061] The angle of the expanding blade 51 after folding and retracting is controlled by controlling the installation angle of the limiting plate 53. At this angle, the expanding blade 51 does not need to be manually flipped and unfolded, and can unfold on its own under the action of the oncoming earth pressure. At the same time, at this angle, the outer diameter of the expanding blade 51 after folding and retracting is smaller than the outer diameter of the pipe jacking machine 1, ensuring that it can enter the construction pipeline 2 so as to be easily pulled back.

[0062] The outer diameter of the expanded hole-reaming blade 51 is equal to or slightly larger than the outer diameter of the construction pipe 2, so that the excavated outline area is equal to or slightly larger than the outer diameter of the construction pipe 2, thereby reducing the resistance when the construction pipe 2 is pushed forward.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A retractable pipe jacking construction device for a pipe jacking machine, characterized in that: Includes a foldable reaming blade (5) connected to the cutterhead (8) of the pipe jacking machine for reaming and a pullback device (7) for pulling back the pipe jacking machine (1); the foldable reaming blade (5) includes: The reaming blade (51) is used to enlarge the drilling diameter of the pipe jacking machine (1). The reaming blade (51) is hinged to the cutter head (8) of the pipe jacking machine. A limiting plate (53) is attached to the reaming blade (51) and is used to control the folding angle of the reaming blade (51). The foldable reaming blade (5) also includes: a connecting ring (52), a connecting pin (55), and a connecting plate (54) welded to the pipe jacking machine cutter head (8); the connecting ring (52) is connected to the reaming blade (51) and cooperates with the connecting plate (54), and the connecting pin (55) passes through the connecting ring (52) and the connecting plate (54) to make the reaming blade (51) hinged to the pipe jacking machine cutter head (8); the limiting plate (53) is connected to the connecting ring (52) to control the folding angle of the reaming blade (51); the limiting plate (53) rotates with the rotation of the connecting ring (52); Furthermore, the limiting plate (53) and the connecting ring (52) are movably connected so that the included angle between the limiting plate (53) and the reaming blade (51) is adjustable, thereby controlling the angle of rotation of the reaming blade (51) around the hinge point, thereby controlling the size of the outer contour after the multiple reaming blades (51) rotate inward and shrink. The angle of the expanding blade (51) after folding and retracting is controlled by the installation angle of the limiting plate (53). At this angle, the expanding blade (51) does not need to be manually flipped and unfolded, and can unfold on its own under the action of the frontal earth pressure. At the same time, at this angle, the outer diameter of the expanding blade (51) after folding and retracting is smaller than the outer diameter of the pipe jacking machine (1), ensuring that it can enter the construction pipeline (2) so as to be easily pulled back. The outer diameter of the expanded hole-reaming blade (51) is equal to or slightly larger than the outer diameter of the construction pipe (2), so that the excavated outline area is equal to or slightly larger than the outer diameter of the construction pipe (2), thereby reducing the resistance when the construction pipe (2) is pushed forward. It also includes a limiting sealing device (4) installed on the construction pipeline (2) and the pipe jacking machine (1); the limiting sealing device (4) includes: a limiting sealing plate (42) connected to the pipe jacking machine (1) to provide radial support force to the end of the pipe jacking machine (1) and to resist water and soil pressure; a limiting anchor bolt (41) connected to the limiting sealing plate (42) and the construction pipeline (2) and to provide longitudinal support force to the limiting sealing plate (42); the limiting anchor bolt (41) is evenly arranged radially along the construction pipeline (2) and fixed to the construction pipeline (2); the limiting sealing plate (42) has a thickness to resist water and soil pressure, play a sealing role, and provide radial support force to the end of the pipe jacking machine (1).

2. The retractable pipe jacking construction device according to claim 1, characterized in that: It also includes a fixing device (3) for connecting the construction pipeline (2) and the pipe jacking machine (1).

3. The retractable pipe jacking construction device according to claim 2, characterized in that: The pipe jacking machine fixing device (3) includes: Ear plate (32) on the outer wall of the welding and jacking machine (1); A clamp (31) is fixed at the joint of the construction pipeline (2); Connecting ear plate (32) and clamping plate (31) are used to fix the radial position of the pipe jacking machine (1) and provide forward support force for the pipe jacking machine (1) by connecting bolt (33).

4. The retractable pipe jacking construction device according to any one of claims 1 to 3, characterized in that: The outer and inner diameters of the limiting sealing plate (42) are respectively matched with the inner diameter of the construction pipeline (2) and the outer diameter of the pipe jacking machine (1).

5. The retractable pipe jacking construction device according to any one of claims 1 to 3, characterized in that: It also includes rollers (6) installed on the middle and bottom of the outer wall of the pipe jacking machine (1).

6. A construction method for a retractable pipe jacking construction device as described in claim 3, characterized in that, Includes the following steps: Install construction pipeline (2) and pipe jacking machine (1) inside the working shaft; Use a pipe jacking machine (1) to excavate the construction pipeline (2) to the designed location; Loosen the connecting bolts (33) of the pipe jacking machine fixing device (3) and use the towing device (7) to tow the pipe jacking machine (1) back to the working well.

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