Adaptive bidirectional jacking pipe construction method

Abstract

The application discloses a kind of adaptive bidirectional jacking pipe jacking construction methods, belong to pipe jacking construction technical field.It includes the following steps: S1, measurement lofting, excavate starting well and accept working well;S2, installation jack;S3, installation pipe jacking machine and place pipeline, top iron;S4, bidirectional jacking jacking construction;S5, after jacking construction is completed, equipment is removed, and restores topography.The application adopts a group of pipe jacking machine, and pipeline is set on the both sides of pipe jacking machine and jacked, since the change of resistance that pipe jacking machine both sides bear, its both ends alternate transform between fixed end and jacking end, realize the adaptive synchronous jacking construction of both sides pipeline;Based on the construction method of the pipe jacking machine, it can guarantee the synchronous construction of both sides pipeline, effectively improve the construction efficiency, at the same time, it can control the construction deviation between both sides pipeline, guarantee the construction quality of pipeline and the connection of pipeline in subsequent starting well;And reduce the demand for starting well construction space.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipe jacking construction, and particularly relates to a self-adaptive bidirectional jacking pipe jacking construction method. BACKGROUND

[0002] Pipe jacking construction is a trenchless construction method, which is a pipe burying construction technology without or with less excavation, and is widely used in municipal engineering. The pipe jacking construction of municipal engineering generally adopts the earth pressure balance method and the slurry balance method. In the construction process, a pipe jacking machine is used for pipe jacking construction.

[0003] In the prior art, the unidirectional jacking construction method is mostly used, and the bidirectional jacking construction method is also used:

[0004] The technical solutions disclosed in patent numbers 202023020976.5 and 202023028140.X are both bidirectional jacking construction methods using a set of combined jacks. In the bidirectional jacking process, if a fault occurs in the equipment of one direction, the jacking of the pipe in the other direction can be normally carried out, thereby ensuring the construction efficiency.

[0005] Although this method can solve the problem of low construction efficiency of the unidirectional jacking construction, since it uses combined jacks for construction, the two pipes are jacked by two sets of jacks respectively. Due to the error between the relative precision of the installation of the two sets of jacks, there is a deviation between the two jacked pipes during the jacking process of the long pipe. In addition, the construction structure needs to construct an inner wall structure in the starting well, and the construction space of the starting well needs to be large enough to meet the installation space of the two sets of jacks, and space needs to be left for the construction of the inner wall and the hoisting of the two pipes. SUMMARY

[0006] In view of the above problems in the prior art, the purpose of the present application is to provide a self-adaptive bidirectional jacking pipe jacking construction method, which can realize bidirectional self-adaptive jacking construction by using a set of jacking machines with jacks, can simultaneously jacking the two pipes synchronously on the basis of ensuring high construction efficiency, has small space requirements for the starting well, and does not need to construct an inner wall structure in the starting well.

[0007] The application provides the following technical solutions: 1. A self-adaptive bidirectional jacking pipe construction method, based on a pipe jacking construction system, the pipe jacking construction system comprising one starting well and two working wells, the starting well being arranged between the two working wells, the starting well and the working wells adopting a steel sheet pile enclosure structure or a prefabricated caisson enclosure structure; an installation track is arranged in the starting well, and a jack for jacking is arranged on the installation track, the rear end of the jack being provided with a jacking plate; the construction method comprises the following specific steps:

[0008] S1. Measuring and lofting, excavating one starting well and two receiving working wells, and laying an installation track in the starting well;

[0009] S2. Hoisting the jack to the installation track and slidingly installing the jack on the installation track;

[0010] S3. Arranging a pipe jacking machine and a pipe in sequence from inside to outside along the jacking hole on both sides of the jack, and arranging a jacking iron between the jacking rod at the front end of the jack and the pipe and between the jacking plate at the rear end of the jack and the pipe;

[0011] S4. Bidirectional jacking construction:

[0012] S4.1. Starting the jack to drive the pipe jacking machine and the pipe to move, cutting and excavating the soil along the jacking direction on both sides through the pipe jacking machine, and jacking the pipe along the excavated channel;

[0013] S4.2. The front jacking rod and the rear jacking plate of the jack are sequentially and alternately used as a jacking end and a fixing end, and self-adaptive bidirectional construction is realized.

[0014] S5. After the jacking construction is completed, the equipment is removed, the pipe in the starting well is connected, and after the connection is completed, the landform is restored.

[0015] Further, the specific process of step S4.2 is as follows:

[0016] The jacking rod of the jack starts to jack out, and in the jacking process, the end receiving a larger resistance is used as the fixing end, and the other end is jacked; when the other end receives a larger resistance due to the lengthening of the pipe joint, the end is used as the fixing end; with the jacking construction, the two ends are sequentially and alternately used as the fixing end, and self-adaptive construction is realized.

[0017] Furthermore, during the adaptive construction process, when the first pipe section on one side is jacked up, if the jacking stroke on one side is large, the jacking rod is retracted, and a second pipe section is placed on one side of the jacking rod, and adaptive jacking construction is carried out again; if the jacking stroke on one side of the top plate is large, the jacking rod is retracted, and the jacking rod is pulled along the installation track to contact the retracted jacking rod with the first pipe section on the corresponding side, and a second pipe section is placed on one side of the top plate. The jacking rod is then pushed out, so that the top plate contacts the second pipe section on the corresponding side, and adaptive jacking construction is carried out; following the above placement sequence, other pipe sections are jacked up sequentially.

[0018] Furthermore, during the adaptive construction process, if one side of the top plate reaches the side wall position of the corresponding receiving well first, the top plate side serves as the fixed end, and a rear support wall is set at the starting well wall on that side. The top plate side of the jack is then pressed tightly against the rear support wall, and the jacking rod side continues to push forward during construction.

[0019] Furthermore, during the adaptive construction process, if one side of the jacking rod reaches the side wall of the corresponding receiving well first, that side serves as the fixed end, the jacking rod extends, and drives the pipe on one side of the top plate to advance. When it is necessary to add a pipe section, the jacking rod retracts, a rear support wall is set at the starting well wall on the corresponding side, the end face of the jacking rod is moved to the rear support wall, a pipe section is added on the top plate side, and the jacking construction continues until the construction is completed.

[0020] Furthermore, during the adaptive construction process, if one side of the jack reaches the side wall of the corresponding receiving well first, the jack is hoisted and installed in reverse on the installation track. A rear support wall is set at the starting well wall on the side where the pipe jacking is completed first, and the top plate side of the jack is pressed tightly against the rear support wall to continue unidirectional jacking construction.

[0021] Furthermore, in step S4.1, during excavation, grout is injected into the excavation face to improve the soil by plasticizing it into a paste. The paste-like soil after being cut is transported to the starting shaft through a slurry pipe via a spiral conveyor device, and then transported to the outside by a pump truck installed in the starting shaft.

[0022] Furthermore, during the jacking construction process, grouting is used to reduce drag, or intermediate relay mechanisms are added or removed to reduce drag during jacking.

[0023] By employing the above-described technology, the beneficial effects of the present invention compared to the prior art are as follows:

[0024] This invention employs a set of pipe jacking machines, with pipes installed on both sides of the machines for jacking. Due to the changing resistance on both sides of the machine, the two ends alternate between the fixed end and the jacking end, achieving adaptive synchronous jacking construction of the pipes on both sides. Based on this pipe jacking machine construction method, synchronous construction of the pipes on both sides can be guaranteed, effectively improving construction efficiency while controlling the construction deviation between the pipes on both sides, ensuring the construction quality of the pipes and the connection of the pipes in the subsequent launching shaft; it also reduces the space required for the launching shaft construction, facilitating the construction of the launching shaft and the installation of construction equipment. Attached Figure Description

[0025] Fig. 1 This is a flowchart of the method of the present invention;

[0026] Fig. 2 This is a schematic diagram of the overall construction structure of the present invention. Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] Conversely, this invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined in the claims. Furthermore, to provide a better understanding of the invention, certain specific details are described in detail below. However, those skilled in the art will fully understand the invention even without these detailed descriptions. Example

[0029] Please see Figs. 1-2 An adaptive bidirectional pipe jacking construction method is proposed. This method is based on a pipe jacking construction system, which includes a launching shaft and two working shafts. The launching shaft is located between the two working shafts. The launching shaft and the working shafts adopt a steel sheet pile retaining structure. The length of the launching shaft needs to meet the space requirements for the installation of the pipe jacking machine and the hoisting of the pipes on both sides. An installation rail is set in the launching shaft, and jacks are slidably installed on the installation rail. A power mechanism for traction of the pipe jacking machine is also set in the launching shaft. The pipe jacking machine is set at the jacking entrance.

[0030] The construction method includes the following specific steps:

[0031] S1. Survey and set out, excavate one launching shaft and two receiving shafts, and lay the installation track in the launching shaft;

[0032] S2. Hoist the jack to the installation track. The jack has a base installed at the bottom. The base is slidably installed on the installation track. The base is equipped with a pipe jacking track for placing the pipe and guiding the pipe jacking.

[0033] S3. On both sides of the jack, the pipe jacking machine and the pipe are set up from the inside to the outside along the jacking opening. The jacking rod at the front end of the jack and the pipe, and the top plate at the rear end of the jack and the pipe are both equipped with jacking irons. When the soil layer at the jacking opening is unstable, the soil should be improved and reinforced.

[0034] S4. Bidirectional jacking construction:

[0035] S4.1. The jacks are started, which drives the pipe jacking machine and the pipeline to move. The pipe jacking machine cuts and excavates the soil along the jacking direction on both sides, and the pipeline is jacked along the excavated channel.

[0036] During excavation, grout is injected into the excavation face to improve the soil through plastic fluidization, turning it into a paste. The paste-like soil after being cut is then transported to the starting shaft via a screw conveyor and mud pipe, and then transported to the outside by a pump truck installed in the starting shaft.

[0037] S4.2 The front jack rod and the rear jack plate alternately serve as the jacking end and the fixing end to achieve adaptive bidirectional construction.

[0038] The jacking rod begins to push out. During the jacking process, due to the different resistances at both ends of the jacking rod and the top plate, the end with greater resistance is used as the fixed end, while the other end is pushed in. When the other end becomes the end with greater resistance due to the length of the pipe section, that end becomes the fixed end. As the jacking construction progresses, the two ends alternately serve as the fixed ends to achieve adaptive construction.

[0039] During adaptive construction, when the first pipe section on one side is jacked up, if the jacking stroke on that side is large, the jacking rod is retracted, and the second pipe section is placed on that side, and adaptive jacking construction is carried out again. If the jacking stroke on the top plate side is large, the jacking rod is retracted, and the jacks are pulled along the installation track to bring the retracted jacking rod into contact with the first pipe section on the corresponding side. The second pipe section is placed on the top plate side, and the jacking rod is pushed out so that the top plate contacts the second pipe section on the corresponding side, and adaptive jacking construction is carried out. Following the above placement sequence, the other pipe sections are jacked up in sequence.

[0040] During adaptive construction, if one side of the top plate reaches the side wall of the corresponding receiving well first, the top plate side is used as the fixed end, and a rear support wall is set at the starting well wall on that side. The top plate side of the jack is pressed tightly against the rear support wall, and the jacking rod side continues to push forward for construction.

[0041] During adaptive construction, if one side of the jacking rod reaches the side wall of the corresponding receiving well first, and the top plate side is close to the corresponding receiving well, that side is used as the fixed end, the jacking rod is pushed out, and the pipe on the top plate side is pushed in. When it is necessary to add pipe sections, the jacking rod is retracted, a rear support wall is set at the starting well wall on the corresponding side, the end face of the jacking rod is moved to the rear support wall, pipe sections are added on the top plate side, and the jacking construction continues until the construction is completed.

[0042] During adaptive construction, if one side of the jack reaches the side wall of the corresponding receiving well first, and the top plate side is far from the corresponding receiving well, the jack is hoisted and installed in reverse on the installation track. A rear support wall is set at the starting well wall on the side where the pipeline jacking is completed first. The top plate side of the jack is pressed tightly against the rear support wall, and unidirectional jacking construction continues.

[0043] S5. After the jacking construction is completed, the pipe jacking machine and pipeline are separated in the receiving well. The pipe jacking machine and pipeline are lifted away from the receiving well. A manhole is constructed at the location of the receiving well. After the manhole is constructed, the steel sheet piles are removed. After the removal is completed, the pile holes are re-erected in a timely manner. At the same time, the equipment in the launching well is dismantled and the pipeline in the launching well is connected. After the connection is completed, the terrain is restored.

[0044] During the jacking construction process, when the jacking distance in a single operation exceeds 100m or the maximum jacking force exceeds the allowable jacking force, grouting to reduce drag or adding or removing intermediate relay mechanisms should be used to reduce jacking drag.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-adaptive bidirectional jacking pipe construction method based on a pipe jacking construction system, characterized in that: The pipe jacking construction system comprises a starting well and two working wells, the starting well being arranged between the two working wells; a mounting track is arranged in the starting well, a jacking device for jacking is arranged on the mounting track, and a back end of the jacking device is provided with a jacking plate; the construction method comprises the following steps: S1. measuring and lofting, excavating a starting well and two receiving working wells, and laying a mounting track in the starting well; S2. hoisting the jacking device to the mounting track and slidingly mounting the jacking device on the mounting track; S3. arranging a pipe jacking machine and a pipe in sequence from inside to outside along the jacking hole on both sides of the jacking device, and arranging a jacking iron between the jacking rod at the front end of the jacking device and the pipe and between the jacking plate at the back end of the jacking device and the pipe; S4. bidirectional jacking construction: S4.

1. starting the jacking device to drive the pipe jacking machine and the pipe to move, cutting and excavating the soil along the jacking direction on both sides by the pipe jacking machine, and jacking the pipe along the excavated channel; S4.

2. starting the jacking rod of the jacking device to jack out, and in the process of jacking, because the resistances at both ends of the jacking rod and the jacking plate are different, the end with the larger resistance is taken as the fixed end, and the other end is jacked in; when the other end becomes the end with the larger resistance because of the lengthening of the pipe joint, the end is taken as the fixed end; with the jacking construction, the two ends are taken as the fixed end in sequence, realizing adaptive bidirectional construction; S5. after the jacking construction is completed, removing the equipment, connecting the pipe in the starting well, and restoring the landform after the connection is completed.

2. The self-adapting bidirectional jacking pipe construction method according to claim 1, characterized in that In the adaptive construction process, when the first pipe joint on one side is jacked in, if the jacking stroke on the side of the jacking rod is larger, the jacking rod is retracted, a second pipe joint is placed on the side of the jacking rod, and adaptive jacking construction is performed again; if the jacking stroke on the side of the jacking plate is larger, the jacking rod is retracted, the jacking rod after retraction is brought into contact with the first pipe joint on the corresponding side along the mounting track by pulling the jacking device, a second pipe joint is placed on the side of the jacking plate, the jacking rod is jacked out to make the jacking plate contact the second pipe joint on the corresponding side, and adaptive jacking construction is performed; other pipe joints are jacked in in sequence according to the above placement order.

3. The self-adapting bidirectional jacking pipe construction method according to claim 2, characterized in that In the adaptive construction process, when the side of the jacking plate reaches the position of the sidewall of the receiving working well on the corresponding side first, the side of the jacking plate is taken as the fixed end, a backseat wall is arranged at the sidewall of the starting well on the side, the side of the jacking plate of the jacking device is tightly attached to the backseat wall, and the side of the jacking rod continues jacking construction.

4. The self-adapting bidirectional jacking pipe construction method according to claim 3, characterized in that In the adaptive construction process, when the side of the jacking rod reaches the position of the sidewall of the receiving working well on the corresponding side first, the side is taken as the fixed end, the jacking rod is jacked out to drive the side of the jacking plate to jack in, when a pipe joint needs to be added, the jacking rod is retracted, a backseat wall is arranged at the sidewall of the starting well on the corresponding side, the end face of the jacking rod is moved to the backseat wall, a pipe joint is added on the side of the jacking plate, and jacking construction is continued until the construction is completed.

5. The self-adapting bidirectional jacking pipe construction method according to claim 3, characterized in that In the adaptive construction process, when the side of the jacking rod reaches the position of the sidewall of the receiving working well on the corresponding side first, the jacking device is hoisted to be reversely mounted on the mounting track, a backseat wall is arranged at the sidewall of the starting well on the side where the pipe jacking is completed first, the side of the jacking plate of the jacking device is tightly attached to the backseat wall, and unidirectional jacking construction is continued.

6. The self-adapting bidirectional jacking pipe construction method according to claim 1, characterized in that In the step S4.1, when excavating, the slurry is injected to the front excavation face to improve the soil to be in paste state, and the cut paste soil is transported to the starting well through the slurry pipe by the screw conveying device, and then transported to the outside through the pump truck arranged in the starting well.

7. The self-adapting bidirectional jacking pipe construction method according to any one of claims 1-5, characterized in that In the jacking construction process, the jacking resistance is reduced by grouting or increasing or reducing the relay interval mechanism.

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