Device for pipe jacking construction in open soil layer

Abstract

The present application provides a device and method for pipe jacking construction in open soil layers, belonging to the field of pipeline construction. The method for pipe jacking construction in open soil layers according to the embodiments of the present application uses the device for pipe jacking construction in open soil layers, and the inner pulling member can form a front card slot and a rear card slot with the force applying member for clamping with the previous pipe and the subsequent pipe. On the one hand, the force applying member can be fixed on the pipe as the force application point of the pushing arm, and on the other hand, the subsequent pipe can be aligned with the previous pipe. During the construction process, the pushing unit continuously pushes the pipe queue, enabling the pipe queue to continuously advance, thus accelerating the construction progress. Moreover, the replacement support member is supported between the two pipes, so that the thrust of the first embedding part of the pushing unit on the subsequent pipe can be transmitted to the previous pipe through the replacement support member, thereby making the forces on each part of the circumference of the previous pipe relatively uniform and avoiding damage or deviation of the previous pipe.

Description

Technical Field

[0001] This application belongs to the technical field of pipeline construction. More specifically, it relates to a device for pipe jacking construction in open soil layers. Background Art

[0002] Pipe jacking construction is a trenchless pipeline laying construction technology. It mainly uses the advancing force generated by pipe jacking equipment to balance the frictional force between the pipeline and the soil, enabling the pipeline to advance. At the same time, it is also necessary to displace the soil occupied by the pipeline, and finally form a pipeline in the soil.

[0003] In current pipe jacking construction, after the previous pipeline is jacked into the soil, the pipe jacking equipment needs to be retracted, and then the new pipeline is docked with the previous pipeline. After that, the pipe jacking equipment is used to continue pushing the new pipeline, and so on in a cycle. During the whole process, the pipe jacking equipment intermittently performs the pushing work, with idle time, resulting in a relatively long construction period. Summary of the Invention

[0004] In view of this, the embodiments of this application provide a device for pipe jacking construction in open soil layers to solve the technical problem in the prior art that the pipe jacking equipment intermittently performs the pushing work, resulting in a relatively long construction period.

[0005] To achieve the above object, the technical solution adopted in this application is as follows:

[0006] On the one hand, a device for pipe jacking construction in open soil layers is provided, which is applicable to pipelines with a socket and a spigot at both ends, and when the pipelines are sequentially advanced in the advancing direction, the sockets of the pipelines are in the front and the spigots are in the rear; the device for pipe jacking construction in open soil layers includes:

[0007] A support and pressure seat, adapted to abut against the support side of the construction shaft;

[0008] N pairs of jacking units, each of the jacking units is connected to the support and pressure seat, and the jacking direction is the same as the advancing direction. The thrust of N - d pairs of the jacking units meets the requirement of pushing the pipeline queue in the soil forward; each pair of the jacking units is symmetrically distributed with respect to the central axis of the pipeline. After the jacking ends of each of the jacking units extend, a receiving space is formed among the jacking ends of each of the jacking units. Before the previous pipeline is pushed into the stable depth in the soil by the jacking unit, the length of the receiving space expands to be suitable for loading at least one section of pipeline; the number of the jacking units above the receiving space is less than d, and after the jacking units above the receiving space retract, the pipeline can enter the receiving space; where N is an integer greater than or equal to 2, and d is an integer greater than or equal to 1; and

[0009] A bracket, correspondingly arranged below the accommodation space, is adapted to support the pipeline in the accommodation space and align the pipeline with the previous pipeline in the advancing direction;

[0010] Each of the pushing units includes:

[0011] A pushing arm, fixed to the supporting and pressing seat, and the pushing direction is the same as the advancing direction;

[0012] A force applying member, including a first embedding portion, an outer limiting portion and a pushing portion; the front end face of the first embedding portion is adapted to abut against the socket end face of the pipeline; the outer limiting portion is connected to the outside of the first embedding portion and is adapted to be limited to the outside of the pipeline; the pushing portion is connected to the outside of the first embedding portion and is adapted to be pushed by the pushing end of the pushing arm;

[0013] An inner pulling member, including a second embedding portion and an inner limiting portion, the rear end face of the second embedding portion is adapted to abut against the bottom surface of the socket of the pipeline; the inner limiting portion is connected to the inside of the second embedding portion and is adapted to be limited to the inside of the pipeline; and

[0014] A replacement support member, including an inner replacement member and an outer replacement member, the replacement support member is adapted to be embedded between the socket end face of the previous pipeline and the bottom surface of the socket of the next pipeline to replace the first embedding portion and the second embedding portion, and after embedding, the front end face of the inner replacement member fits with the socket end face of the previous pipeline, the rear end face of the outer replacement member fits with the bottom surface of the socket of the next pipeline, and the rear end face of the inner replacement member and the front end face of the outer replacement member form an inclined surface fit; the inner replacement member and the outer replacement member are supported between the socket end face of the previous pipeline and the bottom surface of the socket of the next pipeline through the inclined surface fit;

[0015] When the pushing unit pushes the pipeline, the force applying member and the inner pulling member are connected to each other and clamped on the inner and outer sides of the pipeline, the front end of the outer limiting portion is limited outside the rear side wall of the pipeline, the front end of the inner limiting portion is limited inside the rear side wall of the pipeline, the first embedding portion and the second embedding portion are sequentially stacked against the socket end face of the pipeline, a rear clamping groove is formed at the rear ends of the outer limiting portion, the second embedding portion and the inner limiting portion, and a receiving gap communicating with the rear clamping groove is formed between the top of the second embedding portion and the outer limiting portion; the rear clamping groove is adapted for the front side wall of the next pipeline to be inserted, the receiving gap is adapted to receive the outer edge of the socket of the next pipeline, and after the front side wall of the next pipeline is inserted into the rear clamping groove, the next pipeline and the previous pipeline are aligned in the advancing direction;

[0016] In use, n pairs of the pushing units push the previous pipe, and m pairs of the pushing units push the subsequent pipe, where n + m ≥ N - d. For the pushing units that push the previous pipe, the front end side wall of the subsequent pipe is inserted into the rear card slot. For the pushing units that push the subsequent pipe, the inner replacement part and the outer replacement part are supported between the socket end face of the previous pipe and the socket bottom face of the subsequent pipe through the cooperation of the inclined surfaces. The pushing arm pushes the socket side wall of the subsequent pipe through the force applying part, and the force applying part and the replacement supporting part are opposite to each other in the advancing direction.

[0017] In some embodiments, after the first embedding part enters between the socket end face of the previous pipe and the socket bottom face of the subsequent pipe, it is connected to the inner limiting part.

[0018] The rear end side wall of the pipe is provided with a through bolt hole. When the pushing unit pushes the pipe, the front end of the outer limiting part and the front end of the inner limiting part are connected by a bolt passing through the bolt hole.

[0019] In some embodiments, the outer side of the outer replacement part is provided with a limiting part extending forward. The limiting part extends to the outer side of the inner replacement part and continues to extend to be suitable for being limited to the outer side of the socket of the pipe. A pulling bolt connected to the inner replacement part is arranged on the inner side of the limiting part. A docking groove is arranged on the outer side of the rear end of the outer replacement part, and the outer edge of the socket of the pipe is suitable for being inserted into the docking groove to achieve radial limitation.

[0020] The inner side of the inner replacement part is provided with a pulling part extending backward. The pulling part extends to the inner side of the outer replacement part. A pulling bolt connected to the pulling part is arranged on the inner side of the outer replacement part.

[0021] In some embodiments, the inner wall surface of the front end of the outer limiting part is a cylindrical surface. When the pushing unit pushes the pipe, the socket end face of the pipe abuts against the front end face of the first embedding part, and the inner wall surface of the front end of the outer limiting part fits with the outer wall of the pipe.

[0022] The inner wall surface of the rear end of the outer limiting part is a cylindrical surface. After the front end side wall of the subsequent pipe is inserted into the rear card slot, the inner wall surface of the rear end of the outer limiting part fits with the outer wall of the pipe.

[0023] In some embodiments, the outer wall surface of the front end of the inner limiting part is a cylindrical surface. When the pushing unit pushes the pipe, the outer wall surface of the front end of the inner limiting part fits with the inner wall of the pipe.

[0024] The outer wall surface of the rear end of the inner limiting part is a shrinking conical surface, and in the advancing direction, the farthest position where the rear end of the inner limiting part extends backward exceeds the farthest position where the rear end of the outer limiting part extends backward.

[0025] In some embodiments, the first embedding portion is arc-shaped along the circumferential direction of the pipeline; in the radial direction of the pipeline, the thickness of the first embedding portion is less than the wall thickness of the pipeline;

[0026] The second embedding portion is arc-shaped along the circumferential direction of the pipeline; in the radial direction of the pipeline, the wall thickness of the pipeline minus the thickness of the first embedding portion is greater than the thickness of the outer edge of the socket of the pipeline;

[0027] When the replacement supports of each pushing unit are simultaneously supported between the socket end face of the previous pipeline and the socket bottom face of the next pipeline, the adjacent replacement supports are connected end to end.

[0028] In some embodiments, a jack is provided at the rear side of the pushing portion along the advancing direction, and the pushing end of the pushing arm is inserted into the pushing portion through the jack;

[0029] In the advancing direction, the acting position of the pushing end of the pushing arm and the pushing portion is in front of the first embedding portion.

[0030] In some embodiments, the ratio of the length L to the outer diameter D of the pipeline is less than or equal to 2:1; the taper of the pipeline end face is greater than or equal to 3;

[0031] In the advancing direction, the acting position of the pushing end of the pushing arm and the pushing portion corresponds to the position at 1 / 4 to 1 / 3 of the length of the previous pipeline;

[0032] The stable depth is 2 / 3 to 3 / 4 of the length of the pipeline.

[0033] The beneficial effects of the device for pipe jacking construction in open soil layers provided by the embodiments of the present application are as follows: Compared with the prior art, the device for pipe jacking construction in open soil layers of the embodiments of the present application uses N pairs of pushing units to push the pipeline queue, where no less than N - d pairs of pushing units push the previous pipeline or the next pipeline, and the other pushing units are in the switching process, so that no less than N - d pairs of pushing units continuously push the pipeline queue during the whole process, making the pipeline queue continuously advance and accelerating the construction progress;

[0034] The inner pulling member and the force applying member are used for clamping with the previous pipeline and the next pipeline. On the one hand, the force applying member can be fixed on the pipeline as the force application point of the pushing arm to disperse the thrust to a certain extent, and on the other hand, the next pipeline can be aligned with the previous pipeline to ensure the accurate direction of the pipeline queue;

[0035] Meanwhile, when the pushing unit switches to push the subsequent pipe, a replacement support is used to support between the previous pipe and the subsequent pipe, so that the thrust of the pushing unit on the subsequent pipe can be transmitted to the previous pipe through the replacement support, thereby making the forces on each part in the circumferential direction of the previous pipe relatively uniform and avoiding damage or deviation of the previous pipe;

[0036] The replacement support includes an inner replacement part and an outer replacement part. The inner replacement part and the outer replacement part are supported between the previous pipe and the subsequent pipe through inclined surface cooperation, and the support force between the previous pipe and the subsequent pipe can be adjusted by relatively adjusting the inner replacement part and the outer replacement part in the radial direction of the pipe.

[0037] Another technical solution adopted in this application is to provide a method for pipe jacking construction in open soil layers, using the device for pipe jacking construction in open soil layers described in any one of the above, including: construction preparation and cyclic construction;

[0038] The construction preparation includes: building a construction shaft, installing a support seat on the rear side wall of the construction shaft, and making the pushing directions of the pushing units on the support seat consistent with the predetermined pushing direction;

[0039] The cyclic construction includes:

[0040] Push the previous pipe. Use at least N - d pairs of the pushing units to push the previous pipe, so that the previous pipe gradually enters the soil body and the accommodating space gradually expands;

[0041] Add the subsequent pipe. When the accommodating space expands to be able to accommodate one section of the pipe, retract the pushing arms of the corresponding pushing units above and below the accommodating space, add the subsequent pipe into the accommodating space, and make the subsequent pipe supported on the bracket and aligned with the previous pipe in the pushing direction; during this process, the total number of the pushing units continuously pushing the previous pipe is not less than N - d pairs to keep the pipe continuously advancing;

[0042] Switch the pushing units. Before the previous pipe is completely pushed into the soil body, gradually switch the pushing units pushing the previous pipe to push the subsequent pipe in multiple times; during each switching process, the number of the pushing units being switched is not more than d pairs, and the total number of the pushing units continuously pushing the previous pipe or the subsequent pipe is not less than N - d pairs to keep the pipe continuously advancing; the switching process of each pushing unit includes: removing the force - applying part and the corresponding inner pulling part of the pushing unit pushing the previous pipe, using the replacement support of the pushing unit to support between the socket end face of the previous pipe and the socket bottom face of the subsequent pipe, and using this pushing unit to push the subsequent pipe;

[0043] After all the pushing units have switched to push the subsequent pipeline, use the subsequent pipeline in this cycle as the previous pipeline in the next cycle, and repeat the steps of pushing the previous pipeline, adding the subsequent pipeline, and switching the pushing units until the pipe jacking construction is completed.

[0044] The beneficial effects of the pipe jacking construction method in open soil layers provided by the embodiments of the present application are as follows: Compared with the prior art, the pipe jacking construction method in open soil layers of the embodiments of the present application has the same beneficial effects as the above-mentioned pipe jacking construction device in open soil layers, which will not be elaborated here. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0046] Figure 1 It is a schematic diagram during construction of the pipe jacking construction device in open soil layers provided by the embodiments of the present application;

[0047] Figure 2 is Figure 1 a cross-sectional view of the butt joint between the previous pipeline and the subsequent pipeline, where the pushing unit pushes the previous pipeline;

[0048] Figure 3 is Figure 2 an enlarged view of part A in;

[0049] Figure 4 It is a usage state diagram of the replacement support of the pipe jacking construction device in open soil layers provided by the embodiments of the present application;

[0050] Figure 5 is Figure 4 an enlarged view of part B in;

[0051] Figure 6 It is a front view of the pipe jacking construction device in open soil layers provided by the embodiments of the present application when all the pushing units push the subsequent pipeline;

[0052] Figure 7 It is a front view of the pipe jacking construction device in open soil layers provided by the embodiments of the present application when some pushing units push the previous pipeline and some pushing units push the subsequent pipeline.

[0053] Among them, each reference numeral in the figure:

[0054] 1 - Support seat; 2 - Pushing unit; 21 - Pushing arm; 22 - Force - applying member; 221 - First embedding part; 222 - Outer limiting part; 223 - Pushing part; 23 - Inner pulling member; 231 - Second embedding part; 232 - Inner limiting part; 24 - Replacement support member; 241 - Inner replacement part; 2411 - Pulling part; 242 - Outer replacement part; 2421 - Limiting part; 243 - Pulling bolt; 3 - Bracket; 4 - Pipe; 41 - Bottom surface of socket; 42 - Bolt hole; 43 - Outer edge of socket. Detailed implementation mode

[0055] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the following further details the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0057] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meanings of "a plurality of" and "several" are two or more, unless otherwise specifically defined.

[0059] Please refer to Figures 1 to 7 For the device for pipe - jacking construction in open - top soil layer provided by the embodiment of the present application. A device for pipe - jacking construction in open - top soil layer is applicable to pipes with a socket and a spigot at both ends, and when the pipes are successively pushed in the advancing direction, the socket of each pipe is in the front and the spigot is in the rear. The socket end of the pipe can be formed by sleeving a steel sleeve at the end of the pipe, and the steel sleeve serves as the outer edge of the socket. The outer diameter of the spigot end of the pipe is reduced to be suitable for insertion into the socket.

[0060] Device for pipe jacking construction in open soil layer, comprising: a support seat, N pairs of jacking units and a bracket.

[0061] The support seat is adapted to abut against the supporting side of the construction well, providing stable support for the entire equipment in the horizontal direction. The supporting side of the construction well is the side of the construction well opposite to the advancing direction. The support seat can be made of a combination of steel structure and concrete.

[0062] Each jacking unit is connected to the support seat, and the jacking direction is the same as the advancing direction. The thrust of N - d pairs of jacking units meets the requirement of pushing the pipeline queue in the soil forward. Specifically, each jacking unit is arranged horizontally, with the rear end fixedly connected to the support seat and the front end being the jacking end. N is an integer greater than or equal to 2, that is, there are at least two pairs of jacking units; d is an integer greater than or equal to 1, that is, after subtracting at least one pair of jacking units, the thrust of the remaining jacking units is sufficient to push the pipeline queue in the soil forward.

[0063] Each pair of jacking units is symmetrically distributed with respect to the central axis of the pipeline. After the jacking ends of each jacking unit extend, an accommodation space is formed in the middle of the jacking ends of each jacking unit. Specifically, the jacking units are arranged in a circumferential array on the support seat with the horizontal axis as the central axis. After the jacking ends of each jacking unit extend, the cylindrical space in the middle of the jacking ends of each jacking unit is the accommodation space.

[0064] As the jacking ends of the jacking units advance forward, the axial length of the accommodation space continuously increases. Before the jacking units push the previous pipeline into the stable depth in the soil, the length of the accommodation space expands to be suitable for loading at least one section of the pipeline. Specifically, the stable depth needs to be determined according to factors such as soil conditions and pipeline dimensions. Usually, the insertion depth is selected when the pipeline can smoothly advance along the advancing direction only through the guidance of the soil, generally more than half of the pipeline length. After the pipeline is inserted into the soil to reach the stable depth, the pipeline does not need to use the jacking units to finely adjust the advancing direction, but can be completely jacked by the subsequent pipeline.

[0065] In order to ensure uniform thrust in the circumferential direction of the pipeline, usually corresponding jacking units are provided above and below the accommodation space. It is necessary to retract the jacking units above the accommodation space before the pipeline can enter the accommodation space. Therefore, the number of jacking units above the accommodation space is set to be less than d, so that when the corresponding jacking units above and below the accommodation space are retracted, the remaining jacking units still have sufficient thrust to push the pipeline queue forward, thus avoiding prolonging the construction time. Further, the jacking units above the accommodation space and the support seat can be rotatably connected, and the jacking units can be rotated upward to avoid the upper part of the accommodation space, so as to create a larger space and facilitate the subsequent pipeline to enter the accommodation space from above the accommodation space.

[0066] The bracket is correspondingly arranged below the accommodation space, and is adapted to support the pipeline in the accommodation space, avoid interference between the pipeline in the accommodation space and the surrounding pushing units, and align the pipeline with the previous pipeline in the advancing direction.

[0067] Each pushing unit includes: a pushing arm, a force applying member, an inner pulling member, and a replacement support member.

[0068] The pushing arm is fixed to the supporting and pressing seat, and the pushing direction is the same as the advancing direction. The pushing arm mainly provides thrust, and usually a hydraulic cylinder is used.

[0069] The force applying member includes a first embedding portion, an outer limiting portion, and a pushing portion. The front end face of the first embedding portion is adapted to abut against the socket end face of the pipeline, and can apply a forward thrust to the socket end face of the pipeline. The outer limiting portion is connected to the outside of the first embedding portion and is adapted to be limited to the outside of the pipeline. The outer limiting portion can cooperate with the inner limiting portion of the inner pulling member to ensure that the first embedding portion abuts against the rear end of the previous pipeline and the alignment of the subsequent pipeline with the previous pipeline. The pushing portion is connected to the outside of the first embedding portion and is adapted to be pushed by the pushing end of the pushing arm. The pushing portion can transmit the thrust of the pushing arm to the socket end of the previous pipeline through the first embedding portion.

[0070] The inner pulling member includes a second embedding portion and an inner limiting portion. The rear end face of the second embedding portion is adapted to abut against the bottom surface of the socket of the pipeline, and can transmit the thrust of the subsequent pipeline forward to the first embedding portion. The inner limiting portion is connected to the inside of the second embedding portion and is adapted to be limited to the inside of the pipeline. The inner limiting portion can cooperate with the outer limiting portion of the force applying member to ensure that the second embedding portion abuts against the front end of the subsequent pipeline and the alignment of the subsequent pipeline with the previous pipeline.

[0071] The replacement support member includes an inner replacement member and an outer replacement member. The replacement support member is adapted to be embedded between the socket end face of the previous pipeline and the bottom surface of the socket of the subsequent pipeline to replace the first embedding portion and the second embedding portion. After embedding, the front end face of the inner replacement member fits against the socket end face of the previous pipeline, the rear end face of the outer replacement member fits against the bottom surface of the socket of the subsequent pipeline, and the rear end face of the inner replacement member forms an inclined surface fit with the front end face of the outer replacement member.

[0072] When the pushing unit switches from pushing the previous pipeline to pushing the subsequent pipeline, the force applying member and the inner pulling member are removed from between the rear end of the previous pipeline and the front end of the subsequent pipeline, so that a gap is formed between the socket end face of the previous pipeline and the bottom surface of the socket of the subsequent pipeline. The replacement support member is used to support at this gap, so as to transmit the thrust of the subsequent pipeline to the previous pipeline through the replacement support member. The inner replacement member and the outer replacement member are supported between the socket end face of the previous pipeline and the bottom surface of the socket of the subsequent pipeline through an inclined surface fit, and the inner replacement member and the outer replacement member can be adjusted to adapt to different distances between the socket end face of the previous pipeline and the bottom surface of the socket of the subsequent pipeline. In practice, since the replacement support member will ultimately remain at the docking joint of the two pipelines for sealing, a relatively large number of replacement support members need to be prepared.

[0073] When the pushing unit pushes the pipeline (including when pushing the previous pipeline or the next pipeline), the front end of the outer limiting part is limited outside the rear side wall of the pipeline, and the front end of the inner limiting part is limited inside the rear side wall of the pipeline, so that the force applying member and the inner pulling member are positioned at the rear end of the pipeline; the first embedding part and the second embedding part are sequentially stacked against the socket end face of the pipeline, and the rear end of the outer limiting part, the second embedding part and the rear end of the inner limiting part form a rear clamping groove, and a receiving gap communicating with the rear clamping groove is formed between the top of the second embedding part and the outer limiting part; the rear clamping groove is suitable for the front side wall of the next pipeline to be inserted, and the receiving gap is suitable for receiving the outer edge of the socket of the next pipeline, and after the front side wall of the next pipeline is inserted into the rear clamping groove, the next pipeline and the previous pipeline are aligned in the advancing direction.

[0074] During use, n pairs of pushing units push the previous pipeline, and m pairs of pushing units push the next pipeline, where n + m ≥ N - d; that is, the total thrust of the pushing units for pushing the previous pipeline and the next pipeline is sufficient to push the pipeline queue in the soil mass forward and keep the pipeline queue continuously advancing. For the pushing unit pushing the previous pipeline, the front side wall of the next pipeline is inserted into the rear clamping groove. For the pushing unit pushing the next pipeline, the inner replacement part and the outer replacement part are supported between the socket end face of the previous pipeline and the socket bottom face of the next pipeline through inclined plane cooperation, and the pushing arm pushes the socket side wall of the next pipeline through the force applying member, and the force applying member and the replacement support member are opposite in the advancing direction, so that the thrust of the pushing unit for pushing the next pipeline can be transmitted forward to the previous pipeline through the next pipeline and the replacement support member.

[0075] Compared with the prior art, the open-type pipe jacking construction device in the soil layer of the embodiment of the present application uses N pairs of pushing units to push the pipeline queue, where no less than N - d pairs push the previous pipeline or the next pipeline, and the other pushing units are in the switching process, so that no less than N - d pairs of pushing units continuously push the pipeline queue during the whole process, making the pipeline queue continuously advance and accelerating the construction progress.

[0076] The inner pulling member and the force applying member are used for clamping with the previous pipeline and the next pipeline. On the one hand, the force applying member can be fixed on the pipeline as the force application point of the pushing arm, dispersing the thrust to a certain extent. On the other hand, the next pipeline and the previous pipeline can be aligned to ensure the accurate direction of the pipeline queue.

[0077] At the same time, when the pushing unit switches to push the next pipeline, a replacement support member is used to support between the previous pipeline and the next pipeline, so that the thrust of the pushing unit on the next pipeline can be transmitted to the previous pipeline through the replacement support member, so that the forces on each part in the circumferential direction of the previous pipeline are relatively uniform, avoiding damage or deviation of the previous pipeline.

[0078] The replacement support member adopts an inner replacement member and an outer replacement member. The inner replacement member and the outer replacement member are supported between the previous pipe and the next pipe through inclined plane cooperation, and can relatively adjust the inner replacement member and the outer replacement member in the radial direction of the pipe to adapt to different distances between the socket end face of the previous pipe and the socket bottom face of the next pipe, and can also adjust the supporting force between the previous pipe and the next pipe.

[0079] Please refer to Figure 3 , as a specific implementation manner of the pipe jacking construction device in the open soil layer provided by the present application, after the first embedding portion enters between the socket end face of the previous pipe and the socket bottom face of the next pipe, it is connected to the inner limiting portion. A through bolt hole is provided on the side wall at the rear end of the pipe. When the pushing unit pushes the pipe, the front end of the outer limiting portion and the front end of the inner limiting portion are connected by a bolt passing through the bolt hole.

[0080] In this embodiment, the front end of the outer limiting portion and the front end of the inner pulling member are connected by bolts, so that the front end of the outer limiting portion and the front end of the inner pulling member are more firmly clamped on both sides of the side wall at the rear end of the pipe, preventing the force applying member from being misaligned or even falling off the pipe under the thrust of the pushing arm.

[0081] In actual construction, at the end of the construction, the bolt hole is sealed with cement or sealant during the sealing step.

[0082] Please refer to Figure 3 , as a specific implementation manner of the pipe jacking construction device in the open soil layer provided by the present application, a limiting portion extending forward is provided on the outer side of the outer replacement member, and the limiting portion extends to the outer side of the inner replacement member, so that a pulling bolt can be arranged inside the limiting portion to be connected to the inner replacement member. In the implementation, a long strip hole is provided on the inner replacement member, so that the passing pulling bolt can move forward and backward to a certain extent. The relative position of the inner replacement member and the outer replacement member in the radial direction of the pipe can be adjusted through the pulling bolt, so as to adapt to different distances between the socket end face of the previous pipe and the socket bottom face of the next pipe.

[0083] The limiting portion continues to extend to be suitable for being limited outside the socket of the pipe, and can realize butt joint with the socket of the pipe, making the connection between the outer replacement member and the pipe more firm, and also improving the sealing performance to a certain extent.

[0084] A docking groove is provided on the outer side at the rear end of the outer replacement member, and the docking groove is suitable for the outer edge of the socket of the pipe to be inserted to realize radial limitation, and can realize butt joint with the socket of the pipe, making the connection between the outer replacement member and the pipe more firm, and also improving the sealing performance to a certain extent.

[0085] The inner side of the inner replacement part is provided with a pulling part extending backward, and the pulling part extends to the inner side of the outer replacement part, so that a pulling bolt can be arranged on the inner side of the outer replacement part to be connected with the pulling part. During implementation, a long strip hole is arranged on the pulling part, so that the passing pulling bolt can move forward and backward to a certain extent.

[0086] Through the pulling bolt between the limiting part and the inner replacement part and the pulling bolt between the pulling part and the outer replacement part, the relative distance between the inner replacement part and the outer replacement part in the pipe radial direction can be adjusted to adapt to the different spacings between the socket end face of the previous pipe and the socket bottom face of the next pipe, and the supporting force between the previous pipe and the next pipe can also be adjusted.

[0087] Please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 , as a specific implementation manner of the device for pipe jacking construction in open soil layer provided by this application, the inner wall surface at the front end of the outer limiting part is a cylindrical surface. When the pushing unit pushes the pipe, the socket end face of the pipe abuts against the front end face of the first embedding part, and the inner wall surface at the front end of the outer limiting part fits with the outer wall of the pipe. This can make the force applying part more stably fixed at the rear end of the previous pipe.

[0088] The inner wall surface at the rear end of the outer limiting part is a cylindrical surface. When the front side wall of the next pipe is inserted into the rear slot, the inner wall surface at the rear end of the outer limiting part fits with the outer wall of the pipe. This can make the next pipe accurately aligned with the previous pipe.

[0089] During specific implementation, the outer limiting part as a whole is a columnar plate-like structure that fits with the outer wall surface of the pipe.

[0090] Please refer to Figure 2 、 Figure 3 、and Figure 6 , as a specific implementation manner of the device for pipe jacking construction in open soil layer provided by this application, the outer wall surface at the front end of the inner limiting part is a cylindrical surface. When the pushing unit pushes the pipe, the outer wall surface at the front end of the inner limiting part fits with the inner wall of the pipe. The front end of the inner limiting part is positioned from the inner side of the pipe, which can make the inner pulling part more stably fixed at the rear end of the previous pipe.

[0091] The outer wall surface at the rear end of the inner limiting part is a shrinking conical surface, and in the advancing direction, the farthest position where the rear end of the inner limiting part extends backward exceeds the farthest position where the rear end of the outer limiting part extends backward. When the next pipe is docked with the previous pipe, the conical outer wall surface at the rear end of the inner limiting part can guide the front end of the next pipe, so that the front side wall of the next pipe can accurately enter the rear slot.

[0092] During specific implementation, the inner limiting part as a whole is a columnar plate-like structure that fits with the inner wall surface of the pipe, and a shrinking conical surface is machined on the outer wall at the rear end of the inner limiting part.

[0093] Please refer to Figure 2 and Figure 3 As a specific embodiment of the pipe jacking construction device in the open soil layer provided by this application, the first embedding part is arc-shaped along the circumferential direction of the pipe, which can disperse the thrust on the pipe; in the radial direction of the pipe, the thickness of the first embedding part is less than the wall thickness of the pipe, so that after the first embedding part enters between the socket end face of the previous pipe and the socket bottom face of the next pipe, it will not protrude from the inner wall of the pipe, avoiding interference with the inner limiting part.

[0094] The second embedding part is arc-shaped along the circumferential direction of the pipe; in the radial direction of the pipe, the wall thickness of the pipe minus the thickness of the first embedding part is greater than the thickness of the outer edge of the socket of the pipe; so that the accommodation gap formed between the second embedding part and the outer limiting part can accommodate the outer edge of the socket of the next pipe.

[0095] When the replacement supports of each pushing unit are simultaneously supported between the socket end face of the previous pipe and the socket bottom face of the next pipe, the adjacent replacement supports are connected end to end. At the end of the construction, the replacement supports of each pushing unit will remain between the socket end face of the previous pipe and the socket bottom face of the next pipe, and the adjacent replacement supports are connected end to end, which can completely fill the gap between the socket end face of the previous pipe and the socket bottom face of the next pipe. Then, by injecting sealant or pouring cement, the gap between the two pipes can be sealed.

[0096] Please refer to Figure 3 As a specific embodiment of the pipe jacking construction device in the open soil layer provided by this application, a jacking hole along the advancing direction is provided at the rear side of the pushing part, and the pushing end of the pushing arm is inserted into the pushing part through the jacking hole to prevent the pushing end of the pushing arm from being misaligned with the pushing part.

[0097] In the advancing direction, the acting positions of the pushing end of the pushing arm and the pushing part are in front of the first embedding part. On the one hand, when the operator operates at the gap between the two pipes in the pipe (such as installing the inner pulling piece), the operator is far away from the acting positions of the pushing end of the pushing arm and the pushing part and is separated from the side wall of the pipe, avoiding injury to the operator when the pushing end of the pushing arm is misaligned. During construction, the pushing arm applies an obliquely forward pulling force to the rear end of the pipe through the force applying part, generating a forward pushing component force and a radially outward radial component force, and the radial component forces of the two symmetric pushing arms cancel each other out.

[0098] As a specific implementation of the pipe jacking construction device in the open soil layer provided by this application, the ratio of the length L to the outer diameter D of the pipe is less than or equal to 2:1; the taper of the pipe end face is greater than or equal to 3; in the advancing direction, the pushing end of the pushing arm and the acting position of the pushing part correspond to the position of 1 / 4 to 1 / 3 of the length of the previous pipe; the stable depth is 2 / 3 to 3 / 4 of the pipe length. Through the above parameter settings, the stability of the pipe advancing in the soil layer can be improved, and deviation can be avoided.

[0099] Please refer to Figure 1 and Figure 7 This application embodiment also provides a method for pipe jacking construction in an open soil layer. The method for pipe jacking construction in an open soil layer uses the pipe jacking construction device in any one of the above, and includes: construction preparation and cyclic construction.

[0100] The construction preparation includes: constructing a construction well, installing a support seat on the rear side wall of the construction well, and making the pushing directions of the pushing units on the support seat consistent with the predetermined advancing direction.

[0101] The cyclic construction includes:

[0102] Push the previous pipe. Use at least N - d pairs of pushing units to push the previous pipe, so that the previous pipe gradually enters the soil body and the accommodation space gradually expands;

[0103] Add the next pipe. When the accommodation space expands to be able to accommodate one pipe section, retract the pushing arms of the corresponding pushing units above and below the accommodation space, add the next pipe into the accommodation space, and make the next pipe supported on the bracket and aligned with the previous pipe in the advancing direction; during this process, the total number of pushing units continuously pushing the previous pipe is not less than N - d pairs to keep the pipe advancing continuously;

[0104] Switch the pushing units. Before the previous pipe is completely pushed into the soil body, gradually switch the pushing units for pushing the previous pipe to push the next pipe in multiple times; during each switching process, the number of pushing units for switching is not more than d pairs, and the total number of pushing units continuously pushing the previous pipe or the next pipe is not less than N - d pairs to keep the pipe advancing continuously; the switching process of each pushing unit includes: removing the force - applying part and the corresponding inner - pulling part of the pushing unit for pushing the previous pipe, using the replacement support part of the pushing unit to support between the socket end face of the previous pipe and the socket bottom face of the next pipe, and using this pushing unit to push the next pipe;

[0105] After all the pushing units are switched to push the next pipe, use the next pipe in this cycle as the previous pipe in the next cycle, and repeat the steps of pushing the previous pipe, adding the next pipe, and switching the pushing units until the pipe jacking construction is completed.

[0106] The pushing unit pushes the pipe in two cases: pushing the previous pipe and pushing the next pipe. Each case includes the following steps:

[0107] Abutting the first embedded portion of the force applying member of the ejection unit against the socket end surface of the pipe;

[0108] The inner pull member is limited to the inner side of the pipe and connected to the force-applying member, so that the inner limit portion of the inner pull member and the outer limit portion of the force-applying member are clamped inside and outside the rear end wall of the pipe, so that the first embedded portion is kept against the socket end face of the pipe;

[0109] The pushing end of the pushing arm pushes the resisting portion.

[0110] The method for pipe jacking in open soil layers of the present invention utilizes the aforementioned apparatus for pipe jacking in open soil layers. During construction, a pushing unit continuously pushes the pipeline queue, enabling the pipeline queue to continuously advance, thereby accelerating the construction progress. Furthermore, a replaceable support member is provided between the two pipelines, allowing the pushing force exerted by the pushing unit on the rear pipeline to be transmitted to the front pipeline via the replaceable support member. This ensures that the force applied to each circumferential portion of the front pipeline is more evenly distributed, thus preventing damage or deviation of the front pipeline.

[0111] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. Device for pipe jacking construction in open soil layer, characterized in that Applicable to pipes with a socket at one end and a spigot at the other end, and when the pipes are successively advanced in the advancing direction, the sockets of the pipes are in the front and the spigots are in the rear; The device for pipe jacking construction in open soil layers includes: A support seat, adapted to abut against the support side of the construction shaft; N pairs of jacking units, each of the jacking units is connected to the support seat and the jacking direction is the same as the advancing direction. The thrust of N - d pairs of the jacking units meets the requirement of pushing the pipe queue in the soil forward; each pair of the jacking units is symmetrically distributed with the central axis of the pipe as the symmetry axis. After the jacking ends of each of the jacking units extend, a receiving space is formed among the jacking ends of each of the jacking units. Before the jacking unit pushes the previous pipe into a stable depth in the soil, the length of the receiving space expands to be suitable for loading at least one pipe; the number of the jacking units above the receiving space is less than d, and after the jacking units above the receiving space retract, the pipe can enter the receiving space; where N is an integer greater than or equal to 2, and d is an integer greater than or equal to 1; and A bracket, correspondingly arranged below the receiving space, adapted to support the pipe in the receiving space and align the pipe with the previous pipe in the advancing direction; Each of the jacking units includes: A jacking arm, fixed to the support seat and the jacking direction is the same as the advancing direction; A force applying member, including a first embedding portion, an outer limiting portion and a pushing portion; the front end face of the first embedding portion is adapted to abut against the spigot end face of the pipe; the outer limiting portion is connected to the outside of the first embedding portion and is adapted to be limited to the outside of the pipe; the pushing portion is connected to the outside of the first embedding portion and is adapted to be pushed by the jacking end of the jacking arm; An inner pulling member, including a second embedding portion and an inner limiting portion, the rear end face of the second embedding portion is adapted to abut against the socket bottom surface of the pipe; the inner limiting portion is connected to the inside of the second embedding portion and is adapted to be limited to the inside of the pipe; and A replacement support member, including an inner replacement member and an outer replacement member, the replacement support member is adapted to be embedded between the spigot end face of the previous pipe and the socket bottom surface of the next pipe to replace the first embedding portion and the second embedding portion, and after embedding, the front end face of the inner replacement member fits with the spigot end face of the previous pipe, the rear end face of the outer replacement member fits with the socket bottom surface of the next pipe, and the rear end face of the inner replacement member and the front end face of the outer replacement member form an inclined surface fit; the inner replacement member and the outer replacement member are supported between the spigot end face of the previous pipe and the socket bottom surface of the next pipe through the inclined surface fit; When the pushing unit pushes the pipeline, the force-applying member and the inner pulling member are connected to each other and clamped on the inner and outer sides of the pipeline. The front end of the outer limiting portion is limited outside the rear side wall of the pipeline, and the front end of the inner limiting portion is limited inside the rear side wall of the pipeline. The first embedding portion and the second embedding portion are sequentially stacked against the socket end face of the pipeline. A rear card slot is formed at the rear ends of the outer limiting portion, the second embedding portion, and the inner limiting portion. A receiving gap communicating with the rear card slot is formed between the top of the second embedding portion and the outer limiting portion. The rear card slot is adapted for the front side wall of the subsequent pipeline to be inserted, and the receiving gap is adapted for receiving the outer edge of the socket of the subsequent pipeline. After the front side wall of the subsequent pipeline is inserted into the rear card slot, the subsequent pipeline and the previous pipeline are aligned in the advancing direction. In use, n pairs of the pushing units push the previous pipeline, and m pairs of the pushing units push the subsequent pipeline, where n + m ≥ N - d. For the pushing units pushing the previous pipeline, the front side wall of the subsequent pipeline is inserted into the rear card slot. For the pushing units pushing the subsequent pipeline, the inner replacement member and the outer replacement member are supported between the socket end face of the previous pipeline and the socket bottom face of the subsequent pipeline through inclined plane cooperation. The pushing arm pushes the socket side wall of the subsequent pipeline through the force-applying member, and the force-applying member and the replacement support member are opposite to each other in the advancing direction.

2. The device for pipe jacking construction in open soil layers as described in claim 1, characterized in that, After the first embedding portion enters between the socket end face of the previous pipeline and the socket bottom face of the subsequent pipeline, it is connected to the inner limiting portion. The rear side wall of the pipeline is provided with a through bolt hole. When the pushing unit pushes the pipeline, the front end of the outer limiting portion and the front end of the inner limiting portion are connected by a bolt passing through the bolt hole.

3. The device for pipe jacking construction in open soil layer as described in claim 2, wherein The outer side of the outer replacement member is provided with a limiting portion extending forward. The limiting portion extends to the outer side of the inner replacement member and continues to extend to be adapted to be limited outside the socket of the pipeline. A pulling bolt connected to the inner replacement member is provided on the inner side of the limiting portion. A docking groove is provided on the outer side of the rear end of the outer replacement member, and the docking groove is adapted for the outer edge of the socket of the pipeline to be inserted for radial limiting. The inner side of the inner replacement member is provided with a pulling portion extending backward. The pulling portion extends to the inner side of the outer replacement member. A pulling bolt connected to the pulling portion is provided on the inner side of the outer replacement member.

4. The device for pipe jacking construction in open soil layers as described in claim 1, characterized in that, The inner wall surface of the front end of the outer limiting portion is a cylindrical surface. When the pushing unit pushes the pipeline, the socket end face of the pipeline abuts against the front end face of the first embedding portion, and the inner wall surface of the front end of the outer limiting portion fits against the outer wall of the pipeline. The inner wall surface of the rear end of the outer limiting portion is a cylindrical surface. After the front side wall of the subsequent pipeline is inserted into the rear card slot, the inner wall surface of the rear end of the outer limiting portion fits against the outer wall of the pipeline.

5. The device for pipe jacking construction in open soil layer as described in claim 4, characterized in that, The outer wall surface of the front end of the inner limiting portion is a cylindrical surface. When the pushing unit pushes the pipeline, the outer wall surface of the front end of the inner limiting portion fits against the inner wall of the pipeline. The outer wall surface of the rear end of the inner limiting portion is a tapered surface that tapers inwards, and in the advancing direction, the furthest position where the rear end of the inner limiting portion extends backwards exceeds the furthest position where the rear end of the outer limiting portion extends backwards.

6. The device for pipe jacking construction in open soil layer according to claim 4, characterized in that The first embedding portion is arc-shaped along the circumferential direction of the pipeline; in the radial direction of the pipeline, the thickness of the first embedding portion is less than the wall thickness of the pipeline; The second embedding portion is arc-shaped along the circumferential direction of the pipeline; in the radial direction of the pipeline, the wall thickness of the pipeline minus the thickness of the first embedding portion is greater than the thickness of the outer edge of the socket of the pipeline; When the replacement supports of each of the pushing units are simultaneously supported between the socket end face of the previous pipeline and the socket bottom face of the next pipeline, the adjacent replacement supports are joined end to end.

7. The device for pipe jacking construction in open soil layer as claimed in claim 4, wherein A jacking hole is provided at the rear side of the pushing portion along the advancing direction, and the pushing end of the pushing arm is inserted into the pushing portion through the jacking hole; In the advancing direction, the acting position of the pushing end of the pushing arm and the pushing portion is in front of the first embedding portion.

8. The device for pipe jacking construction in open soil layer according to claim 1, characterized in that, The ratio of the length L to the outer diameter D of the pipeline is less than or equal to 2:1; the taper of the pipeline end face is greater than or equal to 3; In the advancing direction, the acting position of the pushing end of the pushing arm and the pushing portion corresponds to the position at 1 / 4 to 1 / 3 of the length of the previous pipeline; The stable depth is 2 / 3 to 3 / 4 of the length of the pipeline.

9. Method for pipe jacking construction in open soil layer, characterized in that, Using the device for pipe jacking construction in open soil layers according to any one of claims 1 to 8, including: construction preparation and cyclic construction; The construction preparation includes: constructing a construction well, installing a support seat on the rear side wall of the construction well, and making the pushing directions of the pushing units on the support seat consistent with the predetermined advancing direction; The cyclic construction includes: Pushing the previous pipeline, using at least N - d pairs of the pushing units to push the previous pipeline, so that the previous pipeline gradually enters the soil body and the accommodating space gradually expands; Adding the next pipeline, when the accommodating space expands to be able to accommodate one section of the pipeline, retract the pushing arms of the corresponding pushing units above and below the accommodating space, add the next pipeline into the accommodating space, and make the next pipeline supported on the bracket and aligned with the previous pipeline in the advancing direction; during this process, the total number of the pushing units continuously pushing the previous pipeline is not less than N - d pairs to keep the pipeline continuously advancing; Switching the pushing units, before the previous pipeline is completely pushed into the soil body, gradually switch the pushing units pushing the previous pipeline to push the next pipeline in multiple times; during each switching process, the number of the pushing units being switched is not more than d pairs, and the total number of the pushing units continuously pushing the previous pipeline or the next pipeline is not less than N - d pairs to keep the pipeline continuously advancing; the switching process of each pushing unit includes: removing the force - applying member and the corresponding inner pulling member of the pushing unit pushing the previous pipeline, using the replacement support of the pushing unit to support between the socket end face of the previous pipeline and the socket bottom face of the next pipeline, and using this pushing unit to push the next pipeline; After all the pushing units have switched to push the subsequent pipeline, take the subsequent pipeline in this cycle as the previous pipeline in the next cycle, and repeat the steps of pushing the previous pipeline, adding the subsequent pipeline, and switching the pushing units until the pipe jacking construction is completed.

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