A pipe jacking anti-retreat device

Abstract

The present invention discloses a pipe jacking anti-retreat device, belonging to the field of pipe jacking construction. The pipe jacking anti-retreat device includes an anti-retreat component and a support component. The anti-retreat components are symmetrically arranged on both sides of the pipe jacking. The support component connects the shaft and the anti-retreat component, and the anti-retreat component is pressed by the support component against the surface of the pipe jacking. In the pipe jacking anti-retreat device of the present invention, the rubber anti-retreat pad of the anti-retreat component pressed by the support component is closely attached to the pipe jacking pipe joint, so that the frictional force between the rubber anti-retreat pad of the anti-retreat component and the pipe jacking pipe joint balances the front earth pressure that jacks the pipe jacking back into the launching shaft in the pipe jacking direction, thereby achieving the anti-retreat effect when there is no rear jacking force after the jack is removed.

Description

Technical Field

[0001] The present invention relates to the field of pipe jacking construction, and particularly to a pipe jacking anti-retreat device. Background Art

[0002] With the development of cities, urban land resources are becoming increasingly scarce, and urban construction is increasingly relying on the development of underground space. The application of pipe jacking technology has played an important role in urban pipeline construction. With the development of large-scale pipe jacking technology, pipe jacking technology has become an important construction method for the setting of urban pedestrian passages and the like. However, pipe jacking is an underground project. Usually, during the pipe jacking construction process, the burial depth is relatively deep. Due to the high groundwater level and weak soil layers in southern regions such as Shanghai, the frontal earth pressure is large. In the initial stage of pipe jacking construction, the side friction resistance it receives is much smaller than the frontal earth pressure. It is necessary to apply a jacking force at the tail of the pipe jack to balance the frontal earth pressure. However, due to the characteristics of pipe jacking construction itself, when adding pipe jacking pipe sections, the jacks applying the jacking force at the tail of the pipe jack must retract, thus removing the jacking force. In order to ensure that the already advanced pipe sections do not retract, it is necessary to set up a pipe jacking anti-retreat device or measure to prevent the pipe sections from retreating.

[0003] Currently, there are mainly two measures to prevent the pipe jack from retreating. The first measure is to respectively set up embedded steel plates on the wall of the launching shaft around the pipe jack and on the pipe jacking pipe sections. When it is necessary to retract the jacks to add pipe jacking pipe sections, weld the connecting steel plate to the embedded steel plates on the wall of the launching shaft and the embedded steel plates on the pipe sections, so that the wall of the launching shaft and the pipe sections are connected as a whole. This anti-retreat method requires welding the connecting steel plate, with complex operations and time-consuming.

[0004] The second measure solves the problems of complex operations and time-consuming in the first measure to a certain extent. The second measure is to manufacture a special anti-retreat device and reserve a hole on the pipe jacking segment. When it is necessary to retract the jacks to add pipe jacking pipe sections, fix one end of the anti-retreat pin on the anti-retreat device, and insert the other end of the anti-retreat pin into the hole reserved on the pipe section to achieve the purpose of anti-retreat. However, the second measure requires reserving a hole for the anti-retreat pin on the pipe jacking segment. Opening a hole for the anti-retreat pin on the pipe jacking segment will cause a large concentrated stress to be generated in the area around the hole for the anti-retreat pin, resulting in the rupture of the pipe jack. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that during pipe jacking construction, when adding pipe jacking pipe sections, the jacks retract, there is no jacking force behind the pipe jack, and under the action of the frontal earth pressure, the pipe jack retreats towards the launching shaft. The existing pipe jacking anti-retreat technology requires reserving a hole for the anti-retreat pin on the pipe jacking segment, resulting in a large concentrated stress being generated in the area around the hole for the anti-retreat pin of the pipe jacking. To solve the problem that the area around the hole for the anti-retreat pin of the pipe jacking is prone to rupture due to stress concentration, a pipe jacking anti-retreat device is provided.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A pipe jacking anti-retreat device is used to prevent the pipe jacking from retreating through the shaft wall. Its characteristics are that the pipe jacking anti-retreat device includes an anti-retreat component and a support component. The anti-retreat components are symmetrically arranged on both sides of the pipe jacking. The support component connects the shaft and the anti-retreat component, and the anti-retreat component is pressed by the support component against the surface of the pipe jacking.

[0008] In this solution, the anti-retreat component is pressed by the support device against the surface of the pipe jacking. There is a frictional force between the anti-retreat component and the pipe jacking. The direction of the frictional force received by the pipe jacking is opposite to the direction of the earth pressure that pushes the pipe jacking back to the launching shaft. Thus, the pipe jacking anti-retreat device prevents the pipe jacking from being pushed back to the launching shaft by the earth pressure.

[0009] Preferably, the anti-retreat component includes two anti-retreat units. The anti-retreat units are pressed by the support component against the surface of the pipe jacking. The anti-retreat units are evenly distributed along the circumferential direction of the pipe jacking, and each anti-retreat unit is located at the same position in the axial direction of the pipe jacking.

[0010] The anti-retreat of the pipe jacking is achieved by pressing the pipe jacking from different circumferential positions by multiple anti-retreat units.

[0011] Preferably, the anti-retreat unit includes an anti-retreat layer and a protective layer. The anti-retreat layer is sandwiched between the pipe jacking and the protective layer, and the protective layer is connected to the support component by a pin shaft.

[0012] The protective layer is connected to the support component by a pin shaft, and the protective layer is connected to the anti-retreat layer by surface contact. The point load of the support component is converted into a surface load through the protective layer and transmitted to the anti-retreat layer. The anti-retreat layer is pressed against the surface of the pipe jacking. The anti-retreat layer is more evenly stressed under the action of the surface load and fits more closely to the surface of the pipe jacking, thus having a better anti-retreat effect.

[0013] Preferably, the anti-retreat layer and the protective layer are bonded.

[0014] By bonding the anti-retreat layer and the protective layer, the protective layer and the anti-retreat layer become an integral body. The load of the support component is transmitted to the anti-retreat layer through the contact surface between the protective layer and the anti-retreat layer. During the process when the anti-retreat unit advances towards the pipe jacking and has not been pressed against the pipe jacking, there will be no problem of falling off due to the lack of connection between the anti-retreat layer and the sealing layer.

[0015] Preferably, the anti-retreat layer is made of an elastic material.

[0016] The anti-retreat layer is made of rubber. When the anti-retreat layer contacts the jacking pipe under no load, due to the surface roughness of the contact surfaces of the two, some areas do not actually come into contact. Under the load of the support component, the anti-retreat layer is pressed against the jacking pipe, and the anti-retreat layer made of rubber deforms. The deformation causes the areas that were not in contact originally to come into contact now. Thus, the actual contact area between the anti-retreat layer and the jacking pipe increases. Under the action of the same support component load, the friction coefficient between the anti-retreat layer and the jacking pipe is greater, with a greater frictional force, and thus has a better anti-retreat effect.

[0017] Preferably, each of the anti-retreat units further includes at least three first connecting seats of the support components. The first connecting seats of the support components are arranged at equal intervals along the circumferential direction of the anti-retreat unit. The distances from each of the first connecting seats of the support components to the end face of the anti-retreat unit are the same. The first connecting seats of the support components are respectively connected to the support components in one-to-one correspondence through pins installed in the vertical direction.

[0018] By arranging the first connecting seats of the support components at equal intervals on the outer periphery of the anti-retreat unit, the anti-retreat unit is installed in one-to-one correspondence with the support components through the first connecting seats of the support components. The load of the support component can be distributed to multiple points of the anti-retreat unit for loading, enabling the support component to transfer the load to the anti-retreat unit more evenly. The first connecting seats of the support components are connected to the support components through pins installed in the vertical direction, that is, the axis of the pin is in the vertical direction, enabling the anti-retreat unit to rotate in the horizontal plane around the pin. During use, the relative angle between the anti-retreat unit and the jacking pipe is adjusted until the axis direction of the anti-retreat unit is the same as the axis direction of the jacking pipe, enabling the anti-retreat unit to fit more closely to the jacking pipe and achieving a better anti-retreat effect.

[0019] Preferably, the jacking pipe anti-retreat device further includes two support component frameworks, which are respectively fixedly connected to the second well wall and the third well wall of the shaft. The support components are connected to the shaft through the support component frameworks.

[0020] By respectively arranging the support component frameworks on the second well wall and the third well wall, the support components can be stably connected to the second well wall and the third well wall of the shaft through the support component frameworks.

[0021] Preferably, the support component framework includes a backing plate. One backing plate is provided on the wall surfaces of the second well wall and the third well wall respectively. The support components are connected to the shaft through the backing plates.

[0022] By providing the backing plates, the support components can be connected to the backing plates, avoiding the support components acting directly on the well wall surface and causing stress concentration. The backing plates evenly transfer the recoil force of the support components to the well wall surface, providing a stable working environment for the support components.

[0023] Preferably, the pipe jacking anti-retreat device further includes:

[0024] A support and fixing member, which is connected to the support member frame; and,

[0025] A limiting member, which is connected to the support and fixing member, fixes the support member, and the limiting member and the support member are arranged in one-to-one correspondence.

[0026] By setting the support and fixing member, the support member can be stably installed on the support member frame. Limiting members are arranged on both sides of the support member to limit the support member, so that the support member cannot rotate in the horizontal direction. The limiting member and the support and fixing member restrict the movement of the support member in the horizontal and vertical directions respectively. Under the action of the limiting member and the support and fixing member, the spatial position of the support member is determined and fixed. The support member cannot move in both the horizontal and vertical directions. Thus, the effect of fixing the support member is achieved.

[0027] Preferably, the support member is a jack.

[0028] By using a jack as the support member, mechanical automation operation is realized.

[0029] The positive and progressive effects of the present invention are as follows:

[0030] In the pipe jacking anti-retreat device of the present invention, the rubber anti-retreat pad of the anti-retreat member of the support member presses tightly against the pipe jacking pipe joint, so that the frictional force between the rubber anti-retreat pad of the anti-retreat member and the pipe jacking pipe joint balances the frontal earth pressure of the pipe jacking pushing the pipe jacking back into the launching shaft, thereby realizing the effect of anti-retreat in the state of no rear jacking force after the jack is removed. Description of the Drawings

[0031] Figure 1 It is a schematic top view of the non-working state of the anti-retreat member of the pipe jacking anti-retreat device according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic front view of the working state of the anti-retreat member of the pipe jacking anti-retreat device according to an embodiment of the present invention.

[0033] Figure 3 It is a schematic front view of the non-working state of the anti-retreat member of the pipe jacking anti-retreat device according to an embodiment of the present invention.

[0034] Description of the Reference Numerals:

[0035] Anti-retreat member 1

[0036] Anti-retreat unit 11

[0037] Anti-retreat layer 111

[0038] Protective layer 112

[0039] The first connecting seat 113 of the support member

[0040] Support member 2

[0041] Support member frame 3

[0042] Base plate 31

[0043] Limit member 32

[0044] Support fixing member 33

[0045] Pin shaft 4

[0046] The first shaft wall 5

[0047] The second shaft wall 6

[0048] The third shaft wall 7

[0049] Jacking pipe 8

[0050] Shaft 9 Specific implementation manners

[0051] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments hereby.

[0052] As Figures 1-3 shown, the jacking pipe anti-retreat device of the embodiment of the present invention is used to prevent the jacking pipe 8 passing through the shaft wall from retreating. The jacking pipe anti-retreat device includes an anti-retreat member 1 and a support member 2. The anti-retreat member 1 is symmetrically arranged on both sides of the jacking pipe 8. The support member 2 connects the shaft 9 and the anti-retreat member 1. The anti-retreat member 1 is pressed by the support member 2 against the surface of the jacking pipe 8.

[0053] During the construction process of the jacking pipe 8, the jacking pipe 8 is jacked into the soil layer from the launching shaft by a jack through the first shaft wall 5 of the launching shaft. During the process that the jacking pipe 8 is continuously jacked into the soil layer, it is necessary to add pipe sections at the tail of the pipe section of the jacking pipe 8. When adding pipe sections to the jacking pipe 8, the jack applying the jacking force at the tail of the jacking pipe 8 must retract, thus removing the jacking force. Since there is an earth pressure in the direction of the jacking of the jacking pipe 8 that can jack the jacking pipe 8 back to the front of the launching shaft along the direction perpendicular to the first shaft wall 5, it is necessary to attach an anti-retreat device to the jacking pipe 8 to prevent the jacking pipe 8 from retreating back to the launching shaft.

[0054] The anti-retreat component 1 is a component used for anti-retreat in the pipe jacking anti-retreat device. The anti-retreat component 1 is connected to the support component 2 through a pin shaft 4, and the anti-retreat component 1 is symmetrically arranged on both sides of the pipe jacking 8. The anti-retreat component 1 is pressed against the pipe jacking 8 under the load of the support component 2. The surfaces of the anti-retreat component 1 and the pipe jacking 8 in contact with each other are rough. When it is necessary to add a pipe joint of the pipe jacking 8 behind the advancing direction of the pipe jacking 8, the jack behind the pipe jacking 8 is removed, and the pipe jacking 8 retreats towards the shaft 9 under the action of the soil pressure in the advancing direction. At this time, the anti-retreat component 1 is closely attached to the surface of the pipe jacking 8 under the pressing action of the support component 2, and the frictional force balance between the anti-retreat component 1 and the surface of the pipe jacking 8 balances the soil pressure that returns the pipe jacking 8 to the shaft 9, achieving the effect of anti-retreat of the pipe jacking 8.

[0055] In this embodiment, the distance from the end of the support component 2 connected to the anti-retreat component 1 to the wall surface of the first shaft wall 5 is the first distance, and the distance from the other end of the support component 2 to the wall surface of the first shaft wall 5 is the second distance, where the second distance is greater than the first distance. Thus, the force exerted by the support component 2 on the anti-retreat component 1 forms an angle with the axis direction of the pipe jacking 8 and points towards the first shaft wall 5, and further presses the anti-retreat component 1 against the pipe jacking 8 and realizes the anti-retreat of the pipe jacking 8.

[0056] The anti-retreat component 1 includes two anti-retreat units 11. The anti-retreat units 11 are pressed against the surface of the pipe jacking 8 by the support component 2. The anti-retreat units 11 are evenly distributed along the circumferential direction of the pipe jacking 8, and each anti-retreat unit 11 is located at the same position in the axial direction of the pipe jacking 8.

[0057] As Figure 1 and Figure 3 shown, the top view and front view of the two anti-retreat units 11 not being pressed against the pipe jacking 8. At this time, the two anti-retreat units 11 are not pressed against the pipe jacking 8, and the pipe jacking anti-retreat device is in a non-working state.

[0058] As Figure 2 shown, the two anti-retreat units 11 are pressed against the pipe jacking 8 by the support component 2. The direction of the frictional force between the inner surface of the anti-retreat unit 11 and the pipe jacking 8 is opposite to the direction of the soil pressure that presses the pipe jacking 8 back into the shaft 9, and the pipe jacking anti-retreat device is in a working state.

[0059] The two anti-retreat units 11 of the anti-retreat component 1 are symmetrically arranged on both sides of the pipe jacking 8. The anti-retreat units 11 are evenly distributed along the circumferential direction of the pipe jacking 8, and each anti-retreat unit 11 is located at the same position in the axial direction of the pipe jacking 8. When the pipe jacking anti-retreat device is working, each anti-retreat unit 11 is pressed against the pipe jacking 8 from different directions by the support component 2. Through the combined action of multiple support components 2 and anti-retreat units 11, a frictional force is generated between the anti-retreat unit 11 and the surface of the pipe jacking 8, realizing the function of anti-retreat of the pipe jacking 8.

[0060] The anti-retraction unit 11 includes an anti-retraction layer 111 and a protective layer 112 . The anti-retraction layer 111 is sandwiched between the top pipe 8 and the protective layer 112 . The protective layer 112 is connected to the supporting component 2 via a pin shaft 4 .

[0061] Specifically, the anti-recoil unit 11 includes an anti-recoil layer 111 close to the top pipe 8 and a protective layer 112 connected to the support component 2. The protective layer 112 is made of steel. There is point contact between the protective layer 112 and the support component 2, and there is surface contact between the protective layer 112 and the anti-recoil layer 111. It should be noted that the "point contact" and "surface contact" in this embodiment are relative concepts, wherein: point contact is interpreted as applying a load to a very small area of the protective layer 112; surface contact is interpreted as a large contact area between the protective layer 112 and the anti-recoil layer 111, and the protective layer 112 applies a load to the anti-recoil layer 111 via the large contact area, for example, the entire inner surface of the protective layer 112 is in contact with the anti-recoil layer 111. The point load of the support component 2 is converted into a surface through the protective layer 112 and transferred to the anti-recoil layer 111, so that the load on the anti-recoil layer 111 is more uniform. The contact and extrusion between the anti-recoil component 1 and the surface of the top pipe 8 generates friction to achieve the anti-recoil effect of the top pipe 8.

[0062] The stopper unit 11 is an arc-shaped structure (it can be made into an elliptical shape according to the shape of the top pipe 8, etc.), and its inner surface shape and size are the same as the outer surface shape and size of the pipe section of the top pipe 8. The inner layer of the stopper unit 11 is a rubber stopper layer 111 to increase the friction between it and the surface of the pipe section; the outer side is a steel protective layer 112, which mainly bears and transfers the load.

[0063] The retaining layer 111 and the protective layer 112 are bonded together.

[0064] By bonding the anti-recoil layer 111 and the protective layer 112, the anti-recoil layer 111 and the protective layer 112 become one. When the anti-recoil unit 11 is pushed into the jacking pipe 8 by the support component 2, the support component 2 is connected to the protective layer 112 through the pin shaft 4. If the anti-recoil layer 111 and the protective layer 112 are not fixedly connected, the anti-recoil layer 111 will fall off during the jacking process due to lack of support. When the anti-recoil layer 111 and the protective layer 112 are fixedly connected, the anti-recoil unit 11 will not fall off due to the lack of connection between the anti-recoil layer 111 and the sealing layer 112 during the jacking process of the jacking pipe 8. The anti-recoil layer 111 is made of elastic material.

[0065] In this embodiment, the elastic material is rubber, that is, the stop layer 111 is made of rubber. Rubber has a certain elasticity. When the jacking pipe stop device is working, the point load of the support device is converted into a surface load through the protective layer 112 and transmitted to the stop layer 111. When the support component 2 has no output load, the stop layer 111 and the surface of the jacking pipe 8 have no contact in some areas due to the roughness of the surfaces of the two. After the stop layer 111 made of hard rubber is subjected to the load transmitted by the protective layer 112, the stop layer 111 is squeezed and deformed. The deformation of the stop layer 111 makes the stop layer 111 contact with the area on the surface of the jacking pipe 8 that was not in contact. The actual contact area between the stop layer 111 and the surface of the jacking pipe 8 increases. The stop of the jacking pipe stop device relies on the friction generated by the mutual contact and extrusion between the stop layer 111 and the jacking pipe 8. The contact area between the stop layer 111 and the jacking pipe 8 is larger, and the jacking pipe stop device has a better stop effect.

[0066] The backstop unit 11 also includes at least three first connecting seats 113 of the support components, which are arranged at equal intervals along the circumference of the backstop unit 11, and the distances from each of the first connecting seats 113 of the support components to the end face of the backstop unit are the same. The first connecting seats 113 of the support components are connected one-to-one with the support components 2 through the pin shaft 4 installed in the vertical direction.

[0067] Figures 1-3 It is illustrated that each retreat-stopping unit 11 is connected to three support component first connecting seats 113. Of course, in other embodiments, the number of support component first connecting seats 113 included in the retreat-stopping unit 11 may exceed 3, for example, the number of support component first connecting seats 113 may be 4 or 5.

[0068] The backstop unit 11 is connected to the support component 2 through the first connecting seat 113 of the support component through the pin 4 in a one-to-one correspondence. The first connecting seat 113 of the support component is evenly spaced along the circumference of the backstop unit 11, and the distances from the multiple first connecting seats 113 of the support component to the end face of the backstop unit are the same. Three first connecting seats 113 of the support component are evenly spaced outside the backstop unit 11, and the load of the support component 2 can be evenly transmitted to the backstop unit 11. The first connecting seat 113 of the support component is connected to the support component 2 through the pin 4 installed in the vertical direction, that is, the axis of the pin 4 is in the vertical direction, so that the backstop unit 11 can rotate around the pin 4 in the horizontal plane. During use, the relative angle between the backstop unit 11 and the top pipe 8 is adjusted until the axial direction of the backstop unit 11 is the same as the axial direction of the top pipe 8, so that the backstop unit 11 can fit more closely to the top pipe 8 and achieve a better backstop effect.

[0069] Each anti-reverse unit 11 is connected to three support members 2 (depending on the size, for example, if the jacking pipe 8 is larger, the number of support members 2 can be increased) through a pin shaft 4. The support member 2 is connected to the anti-reverse unit 11 through the first connection seat 113 of the support member. The support member 2 is connected to the first connection seat 113 of the support member through the pin shaft 4. The connecting piece of the support member 2 connected to the first connection seat 113 of the support member is provided with a through hole. The first connection seat 113 of the support member is provided with a U-shaped groove at the connection with the support member 2. Holes matching the through holes of the connecting piece of the support member 2 are provided on both the upper and lower surfaces of the U-shaped groove. Insert the connecting piece of the support member 2 into the U-shaped groove of the first connection seat 113 of the support member, and use the pin shaft 4 to connect the U-shaped groove and the through hole of the connecting piece of the support member 2. The axis of this through hole is in the vertical direction. The anti-reverse unit 11 rotates horizontally around the axis of the pin shaft 4. Adjust the angle of the anti-reverse unit 11 by horizontal rotation to press and fit against the jacking pipe 8 to achieve the function of stopping the reverse movement of the jacking pipe.

[0070] The jacking pipe anti-reverse device further includes two support member frames 3, and the support member frames 3 are respectively fixedly connected to the second well wall 6 and the third well wall 7 of the shaft 9. The support member 2 is connected to the shaft 9 through the support member frame 3.

[0071] The support member frames 3 are respectively fixedly connected to the second well wall 6 and the third well wall 7 of the shaft 9, and the support member 2 is connected to the second well wall 6 and the third well wall 7 of the shaft 9 through the support member frames 3.

[0072] The support member frame 3 includes a backing plate 31, and one backing plate 31 is provided on the wall surfaces of the second well wall 6 and the third well wall 7 respectively. The support member 2 is connected to the shaft 9 through the backing plate 31.

[0073] The material of the backing plate 31 is steel. One end of the support member 2 is connected to the backing plate 31, and the backing plate 31 is fixed to the well wall of the launching shaft. The support member 2 is connected to the second well wall 6 and the third well wall 7 of the shaft 9 through the backing plate 31. The shaft wall body provides a reaction force for the support member 2 through the backing plate 31. The support member 2 is connected to the well wall through the backing plate 31, so that the point load of the reaction force of the support member 2 is converted into a surface load and transmitted to the well wall surface through the backing plate 31. The direct action of the wall surface support member 2 on the well wall causes stress concentration. The support member frame 3 provides a stable working environment for the support member 2.

[0074] A backing plate 31 is provided at the tail of the support member 2, and the backing plate 31 is fixed on the well wall of the launching shaft. The shaft wall body provides a reaction force for the support member 2. The support member 2 is fixed on the support member frame 3. The support member frame 3 provides support for the support member 2 to ensure the spatial orientation and position of the support member 2. The support member frame 3 also provides a stable environment for the support member 2. The support member 2 and the support member frame 3 are connected and fixed as a whole through the support member support fixing rods.

[0075] The support component 2 is fixed to the support component frame 3, and the support component 2 forms a certain angle with the pushing direction of the top pipe 8. Since the three support components 2 are all fixed to the frame, and the angles formed with the pushing direction of the top pipe 8 are the same, the pushing direction of the support components 2 is the same. The support component 2 drives the stop unit 11 forward during the pushing process, and finally the stop unit 11 fits tightly with the pipe section of the top pipe 8, and the stop layer 111 made of rubber on the inner side of the stop unit 11 has no gap with the outer wall of the pipe wall of the top pipe 8, giving full play to the friction between the stop layer 111 and the pipe section of the top pipe 8, so that the top pipe 8 cannot retreat.

[0076] The pipe jacking stop device also includes:

[0077] A supporting and fixing member 33, the supporting and fixing member 33 is connected to the supporting member frame 3; and,

[0078] The limiting component 32 is connected to the supporting and fixing component 33 , and the limiting component 32 fixes the supporting component 2 .

[0079] In this embodiment, the preferred support and fixing component 33 is four angle steels arranged around the support component, and two angle steels are arranged on each of the left and right sides of the support component. The support and fixing component 33 is connected to the support component frame 3, and the support component 2 is installed on the support and fixing component 33. The support and fixing component 33 supports the support component 2 to maintain horizontal installation, and the support and fixing component 33 limits the vertical movement of the support component 2. The limiting component 32 is fixedly connected to the support and fixing component 33, and the limiting component 32 is vertically installed on both sides of the support component 2. Two angle steels are installed on each side of the support component 2, and the limiting component 32 limits the horizontal movement of the support component 2. The support and fixing component 33 and the limiting component 32 work together to fix the support component 2. The position of the support component 2 is fixed, and the linear displacement output direction of the support component 2 is the same as the fixed direction, thereby limiting the support component 2 to only output linear displacement in the fixed direction. In this embodiment, the preferred support component 2 is a jack.

[0080] The jacking pipe backstop device uses the jack as the power source, realizes mechanical automation operation through the jack, and saves a lot of manual operation. The jack is used as a supporting device. The jack pushes the backstop layer 111 to fit tightly with the jacking pipe 8 through the protective layer 112. Under the load of the jack, there is friction between the backstop layer 111 and the jacking pipe 8, achieving the backstop effect.

[0081] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A pipe jacking anti-retreat device for preventing the retreat of a pipe jacking passing through a shaft wall, characterized in that, The pipe jacking anti-retreat device includes an anti-retreat component and a support component. The anti-retreat component is symmetrically arranged on both sides of the pipe jacking. The support component connects the shaft and the anti-retreat component, and the anti-retreat component is pressed by the support component against the surface of the pipe jacking. The anti-retreat component includes two anti-retreat units. Each anti-retreat unit includes an anti-retreat layer and a protective layer. The protective layer is connected to the support component by a pin shaft. The support component is fixed to the support component frame to ensure the spatial orientation and position of the support component. And the support component forms a certain angle with the pipe jacking propulsion direction to ensure that the support component outputs a linear displacement in a fixed orientation. The distance from the end of the support component connected to the anti-retreat component to the wall surface of the first shaft wall is the first distance, and the distance from the other end of the support component to the wall surface of the first shaft wall is the second distance. The second distance is greater than the first distance. Thus, the force exerted by the support component on the anti-retreat component forms an angle with the axis direction of the pipe jacking and points to the first shaft wall. The first shaft wall is perpendicular to the axis direction of the pipe jacking. The anti-retreat unit is pressed by the support component against the surface of the pipe jacking. The anti-retreat units are evenly distributed along the circumferential direction of the pipe jacking, and each anti-retreat unit is located at the same position in the axial direction of the pipe jacking. Each anti-retreat unit further includes at least three first support component connection seats. The first support component connection seats are arranged at equal intervals along the circumferential direction of the anti-retreat unit. The distances from each first support component connection seat to the end face of the anti-retreat unit are the same. The first support component connection seats are respectively connected to the support component through the pin shafts installed in the vertical direction. Among them, the first support component connection seat connects the support component through the pin shaft installed in the vertical direction, so that the anti-retreat unit can rotate in the horizontal plane around the pin shaft to adjust the relative angle between the anti-retreat unit and the pipe jacking until the axis direction of the anti-retreat unit is the same as the axis direction of the pipe jacking.

2. The pipe jacking anti-retreat device according to claim 1, wherein The anti-retreat layer is clamped between the pipe jacking and the protective layer.

3. The pipe jacking anti-retreat device according to claim 2, wherein, The anti-retreat layer and the protective layer are bonded.

4. The pipe jacking anti-retreat device according to claim 2, wherein The anti-retreat layer is made of an elastic material.

5. The pipe jacking anti-retreat device according to claim 1, characterized in that, The pipe jacking anti-retreat device includes two support component frames, which are respectively fixedly connected to the second shaft wall and the third shaft wall of the shaft. The support component is connected to the shaft through the support component frame.

6. The pipe jacking anti-retreat device according to claim 5, characterized in that, The support component frame includes a backing plate. One backing plate is provided on the wall surfaces of the second shaft wall and the third shaft wall respectively. The support component is connected to the shaft through the backing plate.

7. The pipe jacking anti-retreat device according to claim 6, characterized in that, The pipe jacking anti-retreat device further includes: a support fixing component, which is connected to the support component frame; and, a limiting component, which is connected to the support fixing component. The limiting component fixes the support component, and the limiting component and the support component are arranged in one-to-one correspondence.

8. The pipe jacking anti-retreat device according to any one of claims 1-7, characterized in that, The support component is a jack.

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