Large-diameter pipe jacking external obstacle treatment structure and method for water-rich sand gravel stratum

Abstract

The application provides a large-diameter pipe jacking external obstacle treatment structure and method for water-rich sand gravel stratum, which comprises a transportation unit and a treatment unit; the transportation unit comprises a hoisting device and a transportation trolley; the treatment unit comprises a freezing system, an obstacle treatment system and a sealing system; the hoisting device is used for lowering the entire obstacle treatment structure into a pipe jacking working well; the transportation trolley is used for transporting the freezing system, the obstacle treatment system and the sealing system to a treatment position; the freezing system is used for freezing a certain space range of the treatment position, thereby forming a frozen space; the obstacle treatment system is used for removing external obstacles that need to be treated; and the sealing system is used for repairing and sealing the jacking pipe with a skylight. The large-diameter pipe jacking external obstacle can be treated in time and efficiently; the method is simple, low in cost and high in operability, and can guarantee smooth jacking of the pipe and construction quality of the pipe jacking project.

Description

TECHNICAL FIELD

[0001] The present application relates to the municipal engineering large-diameter pipe jacking construction technical field, especially relates to a large-diameter pipe jacking external obstacle treatment structure and method in water-rich sand and gravel stratum. BACKGROUND

[0002] In the pipe jacking construction, when needing to cross the river, due to the influence of geological conditions, the pipe jacking often can cross the water-rich sand and gravel (sand and pebble) stratum, and is easily hindered by the obstacles (gravel and pebble) in the jacking process, so that the jacking is paused. With the continuous jacking of the pipe jacking machine head, the surrounding geology is disturbed, so that the gravel and pebble in the stratum contact the pipe section through the external mud protection layer of the pipe jacking, and a large friction is generated when the pipe jacking is jacked, which has a great influence: first, the friction of the gravel and pebble on the outer wall of the pipe jacking increases the jacking force, which puts forward higher requirements for the equipment and working well, increases the safety risk, and even causes the project to stop working when the jacking force reaches the jacking limit; second, the irregular shape of the gravel and pebble is easy to scratch the pipe material, especially the large gravel, which will seriously affect the service life.

[0003] Since the pipe jacking construction process is relatively strict, once the jacking is started, the jacking is paused, which will cause safety risks such as collapse, and the construction process is irreversible. Considering that the pipe jacking construction belongs to underground concealed engineering and is in a water-rich environment, if the above events occur, it will have a great influence on the pipe jacking period, and will seriously affect the pipe jacking construction quality and subsequent service life, and the maintenance is difficult and high in cost. Under such complex geological conditions, there is no effective treatment method for the above events. SUMMARY

[0004] In view of the above problems existing in the prior art, the present application provides a large-diameter pipe jacking external obstacle treatment structure and method in water-rich sand and gravel stratum, which is used for treating external obstacles in the large-diameter pipe jacking process, can timely and efficiently treat the external obstacles of the large-diameter pipe jacking, and has the advantages of simple method, low cost and strong operability, can well guarantee the smooth jacking of the pipe jacking, and guarantee the pipe jacking engineering construction quality.

[0005] In order to realize the above technical features, the purpose of the present application is realized as follows: a large-diameter pipe jacking external obstacle treatment structure in water-rich sand and gravel stratum, which comprises a transportation unit and a treatment unit; the transportation unit comprises a hoisting device and a transportation trolley; the treatment unit comprises a freezing system, an obstacle treatment system and a sealing system;

[0006] The hoisting device is used for lowering the whole obstacle treatment structure to the pipe jacking working well;

[0007] The transportation trolley is used for transporting the freezing system, the obstacle treatment system and the sealing system to the disposal position;

[0008] The freezing system is used to freeze a certain space range of the treatment position, thereby forming a frozen space.

[0009] The obstacle treatment system is used to remove the external obstacles needing treatment.

[0010] The sealing system is used to repair and seal the open roof pipe jacking pipe.

[0011] The hoisting device adopts a gantry crane or a hoist.

[0012] The freezing system comprises a freezing device, freezing hoses, freezing branch pipes and sealing plates, the freezing device is arranged outside the pipe jacking shaft, the freezing device is connected with a plurality of freezing branch pipes through the freezing hoses, the freezing hoses extend into the pipe jacking pipe along the pipe jacking shaft, the ends of the freezing branch pipes pass through the through holes arranged on the pipe jacking pipe and are connected with the treatment position; the sealing plates are arranged at the contact positions of the freezing branch pipes and the through holes, and the sealing plates are provided with reserved holes for the freezing branch pipes.

[0013] The freezing device uses liquid nitrogen or ice salt water as the freezing medium.

[0014] The obstacle treatment system comprises a crushing device and a garbage storage device, the crushing device is used to crush and remove the obstacles affecting the pipe jacking construction, and the garbage storage device is used to store and transport the obstacles after crushing.

[0015] The sealing system comprises a roof sealing structure and a mud grouting facility;

[0016] The roof sealing structure is selected according to different pipe materials, when the pipe material is a steel pipe, a steel plate welding structure is selected; when the pipe material is a reinforced concrete pipe, a steel mesh sheet plus concrete spraying structure is selected.

[0017] The mud grouting facility comprises a mud storage pool, a mud pump and a mud conveying pipe, the mud storage pool is used to store mud, the mud is consistent with the mud used in the jacking process, the mud pump is arranged in the mud storage pool, and the mud pump is connected with the reserved hole of the sealing plate of the freezing system through the mud conveying pipe.

[0018] The method for treating external obstacles in a water-rich sand and gravel stratum large-diameter pipe jacking external obstacle treatment structure comprises the following steps:

[0019] Step 1, determination of the position of the external obstacle:

[0020] The specific position of the external obstacle of the pipe jacking pipe is determined by using a physical detection method;

[0021] Step 2, lowering of the obstacle treatment structure into the well:

[0022] The obstacle treatment structure is hoisted to the pipe jacking shaft by the hoisting device;

[0023] Step 3: Transportation of the obstacle treatment structure:

[0024] The freezing system, the obstacle treatment system and the sealing system are transported to the disposal position by the transport trolley;

[0025] Step 4: Installation of the freezing system:

[0026] After being transported to the disposal position, the jacking pipe is first drilled, the freezing hose and the freezing branch pipe are installed, and then the sealing plate is timely installed, and the sealing plate is preformed with a hole size meeting the needs of the freezing hose and the sealing;

[0027] Step 5: Freezing of the disposal position:

[0028] The freezing device is started to freeze a certain space range near the disposal position to form a frozen space; the frozen space is greater than the size of the external obstacle to ensure that the frozen space completely wraps the external obstacle, and when the freezing is completed, the freezing state is continuously maintained to ensure that the frozen area has a certain support strength;

[0029] Step 6: Opening of the frozen area:

[0030] The jacking pipe of the frozen area is opened to form a skylight to provide a working surface for obstacle removal, and the size of the skylight should meet the needs of obstacle treatment;

[0031] Step 7: Cleaning of the external obstacle:

[0032] Under the condition of maintaining the continuous freezing state, the external obstacle affecting the pipe jacking construction is removed by the obstacle treatment system;

[0033] Step 8: Repair of the skylight:

[0034] After the obstacle removal is completed, the skylight is repaired and closed in situ to form a closed structure; the closed structure can be selected according to different pipe materials of the pipe jacking;

[0035] Step 9: After the closure is completed, the sealing property of the skylight closure is detected, and when the skylight closure quality meets the requirements, the freezing is stopped;

[0036] Step 10: After the obstacle treatment is completed, the slurry pipe is installed through the reserved hole of the sealing plate in step 4 to grout the external area of the pipe to form a thixotropic mud protection sleeve outside the pipe, which is fully integrated with the surrounding mud to ensure the normal jacking of the pipe jacking.

[0037] The hole opening method adopts a drilling machine.

[0038] The skylight opening method adopts manual chiseling, a cutting machine or a wind pick.

[0039] The present application has the following advantages:

[0040] 1. By using the treatment structure and method of the present application, the problem pipe section does not need to be replaced as a whole, only the problem point needs to be treated by opening a skylight, which significantly reduces the construction difficulty and treatment cost. The method is simple, convenient, timely and efficient, and has high construction safety.

[0041] 2. By using the treatment structure and method of the present application, a series of problems such as construction period, quality and safety caused by the friction of external obstacles of the sealing pipe jacking can be effectively solved.

[0042] 3. The method has strong application and promotion significance, and can be used not only for obstacle treatment in pipe jacking construction process, but also for treatment of deformation, depression and other defect problems of existing pipe jacking. BRIEF DESCRIPTION OF DRAWINGS

[0043] The present application will be further described below in combination with the drawings and examples.

[0044] Figure 1 is a flowchart of the present application.

[0045] Figure 2 (a) and (b) are comparative schematic diagrams of system repair and after repair of the present application.

[0046] Figure 3 is a Figure 2 (a) single structure diagram of the present application.

[0047] Figure 4 is a Figure 2 (b) single structure diagram of the present application.

[0048] Figure 5 is a Figure 4 A-A partial view of the present application.

[0049] Figure 6 is a frozen branch pipe and mud conveying pipe layout drawing of the present application.

[0050] In the figure: a is a pipe jacking working well; b is a pipe jacking pipeline; c is a pipe jacking machine head; d is a skylight; e is a frozen space; f is an external obstacle; g is an in-situ repair measure method same as the skylight closure structure.

[0051] 1-1 is a hoisting device; 1-2 is a transport trolley;

[0052] 2-1 is a freezing device; 2-2 is a freezing hose; 2-3 is a frozen branch pipe; 2-4 is a sealing plate;

[0053] 3-1 is a crushing device; 3-2 is a garbage storage device;

[0054] 4-1 is a skylight closure structure; 4-2 is a mud storage pool; 4-3 is a mud pump; and 4-4 is a mud conveying pipe. DETAILED DESCRIPTION

[0055] The embodiments of the present application will be further described below with reference to the drawings.

[0056] Example 1

[0057] Reference Figures 1-6 A large-diameter pipe jacking external obstacle treatment structure for a water-rich sand gravel stratum, which comprises a transportation unit and a treatment unit; the transportation unit comprises a hoisting device 1-1 and a transportation trolley 1-2; the treatment unit comprises a freezing system, an obstacle treatment system and a closure system; the hoisting device 1-1 is used to lower the entire obstacle treatment structure into a pipe jacking shaft a; the transportation trolley 1-2 is used to transport the freezing system, the obstacle treatment system and the closure system to a treatment position; the freezing system is used to freeze a certain space range at the treatment position, thereby forming a frozen space e; the obstacle treatment system is used to remove the external obstacle f that needs to be treated; and the closure system is used to repair and close the jacking pipe b with a skylight d. The specific treatment structure of the present application can timely and efficiently treat the large-diameter pipe jacking external obstacle, the method is simple, the cost is low, the operability is strong, and the smooth jacking of the pipe is ensured.

[0058] Further, the hoisting device 1-1 adopts a gantry crane or a hoist. The hoisting device 1-1 is convenient to erect on the top of the pipe jacking shaft a, thereby facilitating the hoisting of the treatment structure into the shaft.

[0059] Further, the freezing system comprises a freezing device 2-1, a freezing hose 2-2, a freezing branch pipe 2-3 and a sealing plate 2-4; the freezing device 2-1 is arranged outside the pipe jacking shaft a; the freezing device 2-1 is connected with a plurality of freezing branch pipes 2-3 through the freezing hose 2-2; the freezing hose 2-2 extends into the jacking pipe b along the pipe jacking shaft a; the distal end of the freezing branch pipe 2-3 penetrates through a through hole arranged on the jacking pipe b and communicates with the treatment position; the sealing plate 2-4 is arranged at the contact part of the freezing branch pipe 2-3 and the through hole, and a reserved hole for penetrating the freezing branch pipe 2-3 is arranged on the sealing plate 2-4. The above-mentioned freezing system can conveniently freeze the space part that needs to be treated, prevent the safety risk of collapse during the treatment process, and ensure the safety of the entire construction.

[0060] Further, the freezing device 2-1 uses liquid nitrogen or ice salt water as freezing medium. During construction, when a window needs to be opened, the freezing medium is delivered to the freezing hose 2-2 by the freezing device 2-1, and then delivered to the freezing branch pipe 2-3 by the freezing hose 2-2, so as to freeze the space part to be disposed.

[0061] Further, the obstacle treatment system comprises a crushing device 3-1 and a garbage storage device 3-2, the crushing device 3-1 is used for crushing and removing the obstacle affecting the pipe jacking construction, and the obstacle after crushing is stored and transported by the garbage storage device 3-2. The above obstacle treatment system can be used for cleaning the obstacle.

[0062] Further, the sealing system comprises a skylight sealing structure 4-1 and a mud grouting facility; the skylight sealing structure 4-1 is selected according to different pipe materials, when the pipe material is a steel pipe, a steel plate welding structure is selected; when the pipe material is a reinforced concrete pipe, a steel mesh sheet plus concrete spraying structure is selected. The above sealing system can be used for sealing the local position after the skylight is opened.

[0063] Further, the mud grouting facility comprises a mud storage pool 4-2, a mud pump 4-3 and a mud conveying pipe 4-4, the mud storage pool 4-2 contains mud, the mud is consistent with the mud used in the jacking process, the mud pump 4-3 is arranged in the mud storage pool 4-2, and the mud pump 4-3 is connected with the reserved hole on the sealing plate 2-4 of the freezing system through the mud conveying pipe 4-4. The above mud grouting can realize the grouting process after repair.

[0064] Embodiment 2:

[0065] The method for treating external obstacles by using the water-rich sand and gravel stratum large-diameter pipe jacking external obstacle treatment structure comprises the following steps:

[0066] Step 1, determination of the position of the external obstacle f:

[0067] The specific position of the external obstacle f of the jacking pipe b is determined by using a physical detection method;

[0068] Step 2, lowering of the obstacle treatment structure into the well:

[0069] The obstacle treatment structure is hoisted to the pipe jacking well a by the hoisting device 1-1;

[0070] Step 3, transportation of the obstacle treatment structure:

[0071] The freezing system, the obstacle treatment system and the sealing system are transported to the disposal position by the transportation trolley 1-2;

[0072] Step 4, installation of the freezing system:

[0073] After being transported to the disposal position, the jacking pipe b is first drilled, the freezing hose 2-2 and the freezing branch pipe 2-3 are installed, and then the sealing plate 2-4 is timely installed, the sealing plate 2-4 is preformed with a hole size meeting the needs of freezing hose access and sealing;

[0074] Step 5, freezing at the disposal position:

[0075] The freezing device 2-1 is started to freeze a certain space range near the disposal position to form a frozen space e; the frozen space e is larger than the size of the external obstacle f to ensure that the frozen space completely wraps the external obstacle f; when the freezing is completed, the freezing state is continuously maintained to ensure that the frozen area has a certain support strength;

[0076] Step 6, opening of the skylight of the frozen area:

[0077] The jacking pipe b of the frozen area is opened to form a skylight d to provide a working surface for obstacle removal, and the size of the skylight should meet the needs of obstacle treatment;

[0078] Step 7, cleaning of the external obstacle f:

[0079] Under the condition of maintaining the continuous freezing state, the external obstacle f affecting the pipe jacking construction is removed through the obstacle treatment system;

[0080] Step 8, repair of the skylight d:

[0081] After the obstacle removal is completed, the skylight d is repaired and closed in situ to form a closed structure 4-1; the closed structure 4-1 can be selected according to different pipe materials of the pipe jacking;

[0082] Step 9, after the closure is completed, the sealing property of the skylight closure is detected, and when the closure quality of the skylight d meets the requirements, the freezing is stopped;

[0083] Step 10, after the obstacle treatment is completed, the mud conveying pipe 4-4 is installed through the reserved hole of the sealing plate 2-4 in step 4 to grout the external area of the pipe to form a thixotropic mud protection sleeve outside the pipe jacking, which is fully integrated with the surrounding mud to ensure the normal jacking of the pipe jacking.

[0084] Further, the hole opening method adopts a drilling machine. The adaptability is enhanced by the above method.

[0085] Further, the skylight opening method adopts a manual chiseling, a cutting machine or a pneumatic pick. The adaptability is enhanced by the above method.

Claims

1. A method for treating external obstacles of large-diameter pipe jacking in water-rich sand and gravel strata, comprising a treatment structure for treating external obstacles of large-diameter pipe jacking in water-rich sand and gravel strata, the treatment structure comprising two parts of a transportation unit and a treatment unit; the transportation unit comprises a hoisting device (1-1) and a transportation trolley (1-2); the treatment unit comprises a freezing system, an obstacle treatment system, and a sealing system; the hoisting device (1-1) is used to lower the entire obstacle treatment structure into a pipe jacking working well (a); the transportation trolley (1-2) is used to transport the freezing system, the obstacle treatment system, and the sealing system to a disposal site; the freezing system is used to freeze a certain space range around the disposal site, thereby forming a frozen space (e); the obstacle treatment system is used to remove external obstacles (f) that need to be treated; the sealing system is used to repair and seal the pipe jacking pipe (b) with the opened window (d); the method comprises the following steps: Step 1: determination of the position of the external obstacle (f): using a physical detection method to determine the specific position of the external obstacle (f) of the pipe jacking pipe (b); Step 2: lowering of the obstacle treatment structure into the well: using the hoisting device (1-1) to hoist the obstacle treatment structure into the pipe jacking working well (a); Step 3: transportation of the obstacle treatment structure: using the transportation trolley (1-2) to transport the freezing system, the obstacle treatment system, and the sealing system to the disposal site; Step 4: installation of the freezing system: after being transported to the disposal site, first drill a hole in the pipe jacking pipe (b), install the freezing hose (2-2) and the freezing branch pipe (2-3), and then timely install the sealing plate (2-4), the size of the reserved hole of the sealing plate (2-4) being suitable for the needs of the freezing hose to go in and out and sealing; Step 5: freezing of the disposal site: starting the freezing device (2-1) to freeze a certain space range around the disposal site, thereby forming a frozen space (e); the frozen space (e) is larger than the size of the external obstacle (f), so as to ensure that the frozen space completely wraps the external obstacle (f), and when the freezing is completed, the frozen state is continued to be maintained, so as to ensure that the frozen area has a certain supporting strength; Step 6: opening of the window in the frozen area: opening a window (d) in the pipe jacking pipe (b) of the frozen area, thereby providing a working surface for obstacle removal, and the size of the opened window should meet the needs of obstacle treatment; Step 7: cleaning of the external obstacle (f): under the condition of maintaining the continued freezing state, using the obstacle treatment system to remove the external obstacle (f) that affects the pipe jacking construction; Step 8: repair of the window (d): after the obstacle removal is completed, repairing and sealing the window (d) in situ, thereby forming a sealing structure (4-1); the sealing structure (4-1) can be selected according to different pipe materials of the pipe jacking; Step 9: after the sealing is completed, detecting the sealing property of the sealed window (d), and when the sealing quality of the window (d) meets the requirements, stopping the freezing. ​ ​ ​ ​ ​ characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Step 10, after the obstacle treatment is completed, install the mud pipe (4-4) through the reserved hole of the sealing plate (2-4) in step 4, grout the external area of the pipe, form a thixotropic mud protection sleeve outside the pipe jacking, and fully blend with the surrounding mud to ensure the normal jacking of the pipe jacking.

2. The method according to claim 1, wherein the method is characterized in that: The hoisting device (1-1) is a gantry crane or a hoist.

3. The method according to claim 1, wherein the method is characterized in that: The freezing system comprises a freezing device (2-1), a freezing hose (2-2), freezing branch pipes (2-3), and a sealing plate (2-4). The freezing device (2-1) is arranged outside the pipe jacking shaft (a). The freezing device (2-1) is connected to a plurality of freezing branch pipes (2-3) through the freezing hose (2-2). The freezing hose (2-2) extends into the pipe jacking pipe (b) along the pipe jacking shaft (a). The ends of the freezing branch pipes (2-3) pass through the through holes arranged on the pipe jacking pipe (b) and communicate with the disposal position. The sealing plate (2-4) is arranged at the position where the freezing branch pipes (2-3) contact the through holes. The sealing plate (2-4) is provided with reserved holes for the freezing branch pipes (2-3).

4. The method for treating external obstacles of large-diameter pipe jacking in water-rich sand-gravel stratum according to claim 3, characterized in that: The freezing device (2-1) uses liquid nitrogen or ice salt water as the freezing medium.

5. The method for treating external obstacles of large-diameter pipe jacking in water-rich sand-gravel stratum according to claim 1, characterized in that: The obstacle treatment system comprises a crushing device (3-1) and a garbage storage device (3-2). The crushing device (3-1) is used to crush and remove obstacles affecting pipe jacking construction. The garbage storage device (3-2) is used to store and transport the crushed obstacles.

6. The method for treating external obstacles of large-diameter pipe jacking in water-rich sand-gravel stratum according to claim 1, characterized in that: The sealing system comprises a skylight sealing structure (4-1) and a mud grouting facility. The skylight sealing structure (4-1) is selected according to the pipe material. When the pipe material is steel pipe, a steel plate welding structure is selected. When the pipe material is reinforced concrete pipe, a steel mesh and concrete spraying structure is selected.

7. The method for treating external obstacles of large-diameter pipe jacking in water-rich sand gravel stratum according to claim 6, characterized in that: The mud grouting facility comprises a mud storage tank (4-2), a mud pump (4-3), and a mud conveying pipe (4-4). The mud storage tank (4-2) contains mud. The mud is the same as that used during pipe jacking. The mud pump (4-3) is arranged in the mud storage tank (4-2). The mud pump (4-3) is connected to the reserved hole of the sealing plate (2-4) of the freezing system through the mud conveying pipe (4-4).

8. The method according to claim 3, wherein the method is characterized by, The through hole is drilled by a drilling machine.

9. The method for treating external obstacles of large-diameter pipe jacking in water-rich sand gravel stratum according to claim 1, characterized in that, The skylight is manually chiseled or cut by a cutting machine or a pneumatic pick.

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