Squeezing type pipe jacking construction method for small-diameter glass fiber pipe

Abstract

The invention discloses an extrusion type pipe jacking construction method for a small-diameter glass fiber pipe. The extrusion type pipe jacking construction method comprises the following steps that S1, construction preparation is conducted; s2, a steel casing receiving well is constructed; s3, mounting a working well and a back wall; s4, a propelling machine table is installed, and a pilot pipe is ejected out; s5, pipe fitting installation; s6, jacking the glass fiber reinforced plastic pipe; s7, the pipe fitting enters a receiving well; and S8, the inspection well is built, and the steel casing is pulled out. When pipe-jacking construction is adopted, pipe-jacking working well construction and pipe joint prefabrication can be conducted synchronously, a receiving well can be constructed and pipe-jacking equipment can be installed after the pipe-jacking working well is completed, pipe-jacking jacking can be started after the receiving well is completed, all procedures are closely connected, construction is not affected by weather, continuous operation can be achieved, and the construction period is greatly shortened. According to the construction method, the road is not damaged during construction, the existing pipeline is provided, the construction noise is low, the influence on the road, traffic and the surrounding environment is small, the construction period is short, the environmental protection target is really achieved, and the traditional construction mode of firstly breaking the road and then building is fundamentally changed.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, in particular to a small-diameter glass fiber pipe extrusion type pipe jacking construction method. Background Art

[0002] With the rapid development of urban construction in my country and the deepening of urbanization, a large number of municipal pipelines that are old, severely damaged or do not meet the needs of use need to be built, renovated and repaired. Pipeline construction cannot avoid crossing roads, and underpass construction is becoming more and more common. Traditional open-cut paving construction has problems such as inconvenient construction, long site blockade time, high construction cost, and many safety hazards in pipeline grooving.

[0003] The existing trenchless pipe jacking technologies mainly include mud-water balance, earth pressure balance and micro-pipe jacking secondary method. These technologies have been widely used at home and abroad, especially in the laying of urban sewage pipes, rainwater pipes and tap water pipes. However, the existing technologies still have some limitations:

[0004] Complex equipment: Pipe jacking equipment is usually large and complex, requiring professional operators and maintenance personnel.

[0005] Higher cost: The purchase and maintenance costs of equipment are high, which increases the overall cost of construction.

[0006] Limited scope of application: Under certain special geological conditions, such as strata containing a large amount of pebbles or hard rocks, pipe jacking construction is more difficult.

[0007] High construction accuracy requirements: Pipe jacking construction requires precise control of direction and slope. Once deviation occurs, it is difficult to correct.

[0008] Therefore, a small-diameter glass fiber pipe extrusion type jacking construction method is proposed to solve the current shortcomings. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a small-diameter glass fiber tube extrusion type pipe jacking construction method, which is suitable for the construction of pipelines passing under existing roads and pipelines in soft soil such as clay, silty clay, silty clay and silty clay and when the pipe diameter is less than DN1000.

[0010] In order to solve the above technical problems, the technical solution provided by the present invention is a small-diameter glass fiber tube extrusion type jacking construction method, which comprises the following steps:

[0011] S1. Construction preparation:

[0012] Contact relevant pipeline management units to explore the underground power, water supply and communication pipelines at the construction site, mark their locations, and do a good job of line protection. At the same time, determine the jacking work well and receiving well according to the jacking position, determine the protection range and protection method according to the direction and length of the pipeline, conduct technical explanations to relevant technical personnel and operating levels, and organize the entry of materials and equipment, which will be used in the project after acceptance and random inspection;

[0013] S2. Construction of steel casing receiving well:

[0014] The receiving well adopts steel casing caisson, and the caisson construction adopts mechanical operation. The mechanical equipment used is called pipe shaking machine, and the auxiliary equipment is excavator. The wall thickness of the steel casing is 20mm, the inner diameter is 2600mm, and the length of each section of the steel casing is 2.0m. The steel casings are connected and fixed by slots + temporary welding. The lower part of the steel casing is cut into a sawtooth shape with a tooth depth of 10cm. After the pipe shaking machine installs the steel casing to the design elevation, the soil in the steel casing is taken out by an excavator. After the soil is taken, C30 concrete is immediately used to seal the bottom with a thickness of 50cm. According to the design elevation and diameter of the pipeline outlet, oxygen acetylene is used to cut the top hole on the well wall. At the same time, in order to ensure the bottom sealing requirements and the stability of the steel casing during the top pipe process, the bottom of the steel casing is embedded in the soil layer to a depth of not less than 1.0m;

[0015] S3, working well and back wall installation:

[0016] The jacking work well uses the main line work well for rainwater and sewage. Generally, two supporting work wells are needed for jacking, one for the jacking work well and one for the receiving well. After the work well platform is set up, the back of the jacking pipe is installed first;

[0017] The structure of the mechanical jacking steel back wall is: caisson concrete (or steel casing) + back channel steel. The back channel steel is tightly attached to the jacking working well and is firmly reinforced. The back wall is a steel casing. During installation, the center of the steel casing and the axis of the jacking pipe should be adjusted to avoid eccentric pressure.

[0018] S4, installation of the push machine and ejection of the pilot tube:

[0019] After the jacking work pit and back concrete construction are completed, the base of the pusher and the machine, laser theodolite are installed according to the central axis of the pipeline, and a simple bracket is made and installed as a support for the pilot pipe and pipe fittings;

[0020] After the laser theodolite is set up according to the center and elevation of the pipeline, the slope ratio is adjusted according to the designed slope. After the instrument is set up, the pilot pipe jacking construction begins. The pilot pipe consists of a guide head and a 1m / section It is composed of steel pipes, the pipe joints are connected by threads, and the level ruler is used to measure and correct the deviation in real time during the jacking process;

[0021] S5. Pipe fittings installation:

[0022] The conical transition joint is made of 1cm thick steel plate. The tip is firmly connected to the pilot pipe with a pipe clamp, and the tail is connected to the pipe fitting with a socket joint.

[0023] S6, Glass fiber reinforced plastic pipe jacking:

[0024] The jacking pipe is made of vertical vibrating glass fiber reinforced plastic pipe with high rigidity and light weight. The length of a single pipe section is 1m, and the allowable jacking force is less than or equal to 1000KN. During the jacking process, each section of the pipeline needs to be pushed and retracted by the cylinder. For every 1m of jacking, a section of glass fiber pipe is installed in the starting working well, and a section of the pilot pipe is removed in the receiving well. The whole jacking construction process is completed in a cycle.

[0025] S7. Pipe fittings enter the receiving well:

[0026] After the pipeline is constructed according to the designed length, the pipe fittings enter the receiving well, the remaining pilot pipe and transition joints are removed, and this section of pipe jacking is completed;

[0027] S8. Construction of inspection well and removal of steel casing:

[0028] After the jacking is completed, an inspection well is built in the jacking working shaft, the bottom plate is leveled with plain concrete, and the space between the inspection well and the steel casing is backfilled in layers with gravel and soil with a particle size not exceeding 5 cm, with a compaction degree of not less than 95%. After the backfilling is completed, except for the bottom 2m casing, the rest of the casings are pulled out for the next step of jacking.

[0029] As an improvement, in S2, the model of the pipe shaking machine is Φ2600, and the excavator is a 200 excavator.

[0030] As an improvement, in S3, the depth of the jacking working pit is about 30 cm below the pipe bottom elevation, and an I16 I-beam support is used as the bottom plate at the bottom of the pit.

[0031] As an improvement, the back channel steel is 20cm thick and 1.8m high.

[0032] As an improvement, in S4, the pilot pipe is pushed into the receiving well according to the slope set by the laser theodolite, and is pushed into place in advance by using the pilot pipe without draining the soil. The pilot pipe connects the working well and the receiving well, and then a steel circular trumpet is used to connect the pilot pipe and the pipe section, and then the pipe section is pushed forward.

[0033] As an improvement, in S6, before pushing the fiberglass pipe forward, first check whether the pilot tube, machine head, pipe joint and jack are coaxial to prevent eccentric load during pushing. When pushing the fiberglass pipe forward, follow the following procedure: install the pipe joint → turn on the oil pump to extend the piston of the jack → open the valve to return oil after the jack extends the piston to the rated length → lower the pipe.

[0034] As an improvement, in S6, the jacking force of the fiberglass pipe needs to be estimated. The total jacking force of the pipe is calculated as follows:

[0035] F0=πD1Lf k +N F

[0036]

[0037] Where F0 is the standard value of total top force (kN);

[0038] D1—pipeline outer diameter (m);

[0039] L—pipeline design jacking length (m);

[0040] f k —Average frictional resistance between the outer wall of the pipeline and the soil (kN / ㎡);

[0041] N F —head resistance of the pipe jacking machine (kN);

[0042] D g —Outer diameter of pipe jacking machine (m);

[0043] R—extrusion resistance (kN / ㎡), which can be 300~500kN / ㎡;

[0044] E—Opening ratio of extrusion bell mouth.

[0045] The advantages of the present invention compared with the prior art are:

[0046] 1. The construction method of the present invention does not damage roads and existing pipelines, has low construction noise, has little impact on roads, traffic and surrounding environment, has a short construction period, truly achieves the goal of environmental protection, and fundamentally changes the traditional construction mode of first breaking the road and then building;

[0047] 2. When using pipe jacking construction, the construction of the pipe jacking work well and the prefabrication of pipe sections can be carried out simultaneously. After the pipe jacking work well is completed, the receiving well can be constructed and the pipe jacking equipment can be installed. After the receiving well is completed, the pipe jacking can be started. Each process is closely connected, the construction is not affected by extreme weather, and the operation can be carried out uninterruptedly, which greatly shortens the construction period and speeds up the construction progress;

[0048] 3. The construction method of the present invention has a short construction period, requires fewer construction workers, saves various costs, reduces precipitation, soil reinforcement and other measures, avoids large-scale demolition work, reduces a large amount of site occupation, and has obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 The invention discloses a process flow chart of a small-diameter glass fiber pipe extrusion type pipe jacking construction method.

[0050] Figure 2 It is an elevation view of a steel casing receiving shaft in a small-diameter glass fiber tube extrusion type jacking construction method of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the invention clearer, the technical solution in the embodiments of the invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Generally, the components of the embodiments of the invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] In the description of the embodiments of the invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, it is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0053] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of the embodiments of the invention, "a plurality of" means at least two.

[0055] In the description of the embodiments of the invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0056] In conjunction with the accompanying drawings, a small diameter glass fiber tube extrusion type jacking construction method, a small diameter glass fiber tube extrusion type jacking construction method: comprising the following steps:

[0057] S1. Construction preparation: Contact relevant pipeline management units, explore the underground power, water supply and communication pipelines at the construction site, mark their positions, and do a good job of line protection. At the same time, determine the jacking work well and receiving well according to the jacking position, determine the protection range and protection method according to the direction and length of the pipeline, conduct technical explanations to relevant technical personnel and operating levels, and organize the entry of materials and equipment. After on-site acceptance and sampling, they will be used in the project;

[0058] S2. Construction of steel casing receiving well: The receiving well adopts steel casing caisson, and the caisson construction adopts mechanical operation. The name of the mechanical equipment used is pipe shaking machine, and the auxiliary equipment is excavator. Specifically, the selection of the pipe shaking machine should be determined after technical and economic comparison based on factors such as the properties of the soil layer where the pipeline is located, pipe diameter, groundwater level, nearby above-ground and underground buildings and various facilities. In this embodiment, the model of the pipe shaking machine is Φ2600, and the excavator is a 200 excavator. The wall thickness of the steel casing is 20mm, the inner diameter is 2600mm, and the length of each section of the steel casing is 2.0m. The steel casings are connected and fixed by slots + temporary welding. The lower part of the steel casing is cut into a sawtooth shape with a tooth depth of 10cm. After the pipe shaking machine installs the steel casing to the design elevation, the soil in the steel casing is taken out by an excavator. After the soil is taken, C30 concrete is immediately used to seal the bottom with a thickness of 50cm. According to the design elevation and diameter of the pipeline outlet, oxygen acetylene is used to cut the top hole on the well wall. At the same time, in order to ensure the bottom sealing requirements and the stability of the steel casing during the top pipe process, the bottom of the steel casing is embedded in the soil layer to a depth of not less than 1.0m;

[0059] S3. Installation of working well and back wall: The working well of the jacking pipe uses the main working well of the rainwater and sewage line. Generally, two supporting working wells are required for the jacking pipe, one for the jacking working well and one for the receiving well. The depth of the jacking working well is about 30cm below the bottom elevation of the pipe. The bottom of the pit uses I16 I-beam bracket as the bottom plate. After the working well platform is set up, the back of the jacking pipe is installed first;

[0060] The structure of the mechanical jacking steel back wall is: caisson concrete (or steel casing) + back channel steel. In this embodiment, the back channel steel is 20 channel steel. The back channel steel is tightly attached to the jacking working well and reinforced firmly. The back channel steel is 20cm thick and 1.8m high. The back wall is a steel casing. During installation, the center of the steel casing and the axis of the jacking pipe must be adjusted to avoid eccentric compression.

[0061] S4. Installation of the pusher and ejection of the pilot pipe: After the jacking work pit and back concrete construction are completed, the pusher base and machine, laser theodolite are installed according to the central axis of the pipeline, and a simple bracket is made and installed as a support for the pilot pipe and pipe fittings;

[0062] After the laser theodolite is set up according to the center and elevation of the pipeline, the slope ratio is adjusted according to the designed slope. After the instrument is set up, the pilot pipe jacking construction begins. The pilot pipe consists of a guide head and a 1m / section It is composed of steel pipes, the pipe joints are connected by threads, and the level ruler is used to measure and correct the deviation in real time during the jacking process;

[0063] During implementation, the pilot pipe is pushed into the receiving well according to the slope set by the laser theodolite. The pilot pipe is pushed into place in advance without draining soil, reducing the workload of draining soil. The pilot pipe connects the working well and the receiving well, and then a steel circular trumpet is used to connect the pilot pipe and the pipe section, and then the pipe section is pushed forward, which greatly improves the installation accuracy of the pipeline.

[0064] S5. Pipe fitting installation: Use 1cm thick steel plate to make a conical transition joint. The tip and the pilot pipe are firmly connected with pipe clamps, and the tail and the pipe fitting are connected with a socket joint.

[0065] S6. Fiberglass reinforced plastic pipe jacking: The jacking pipe is made of vertical vibrating fiberglass reinforced plastic pipe with high rigidity and light weight. The length of a single pipe section is 1m, and the allowable jacking force is less than or equal to 1000KN. At the beginning of jacking, it should be carried out slowly. After all contact parts are tightly closed, jacking should be carried out at the normal jacking speed. During the jacking process, each section of the pipeline needs to be pushed and retracted by the cylinder. For every 1m of jacking, a section of fiberglass pipe is installed in the starting working well, and a section of the pilot pipe is removed in the receiving well. The whole jacking construction process is completed in a cycle.

[0066] Before jacking the fiberglass pipe, first check whether the pilot tube, machine head, pipe joint and jack are coaxial to prevent eccentric load during jacking. Follow the following procedure when jacking the fiberglass pipe: install the pipe joint → turn on the oil pump to extend the piston of the jack → open the valve to return oil after the jack extends the piston to the rated length → lower the pipe.

[0067] It is worth noting that when the jack piston is retracted, the oil pressure should not be too large and the speed should not be too fast.

[0068] The jacking force of the fiberglass pipe needs to be estimated. The total jacking force of the pipe is calculated as follows:

[0069] F0=πD1Lf k +N F

[0070]

[0071] Where F0 is the standard value of total top force (kN);

[0072] D1—pipeline outer diameter (m);

[0073] L—pipeline design jacking length (m);

[0074] fk —Average frictional resistance between the outer wall of the pipeline and the soil (kN / ㎡);

[0075] N F —head resistance of the pipe jacking machine (kN);

[0076] D g —Outer diameter of pipe jacking machine (m);

[0077] R—extrusion resistance (kN / ㎡), which can be 300~500kN / ㎡;

[0078] E—Opening ratio of extrusion bell mouth.

[0079] During the construction process, the allowable deviation of the pipe jacking work pit construction must meet the requirements of the following table:

[0080] Table 1 Maximum allowable deviation of pipe jacking pit construction (mm)

[0081]

[0082] Note: H is the height of the back wall (mm); L is the length of the back wall (mm).

[0083] The allowable deviation of pipe jacking construction must meet the requirements of the following table:

[0084] Table 2 Maximum allowable deviation of pipe jacking construction (mm)

[0085]

[0086] Note: Di is the inner diameter of the pipe (mm).

[0087] S7, pipe fittings enter the receiving well: After the pipeline is constructed according to the designed length, the pipe fittings enter the receiving well, the remaining pilot pipe and transition joints are removed, and this section of pipe jacking is completed;

[0088] S8. Build inspection wells and pull out steel casings: After the jacking is completed, build inspection wells in the jacking working well. The bottom plate is leveled with plain concrete. The space between the inspection wells and the steel casings is backfilled in layers with gravel and soil with a particle size not exceeding 5 cm. The compaction degree is not less than 95%. After the backfilling is completed, except for the bottom 2m casing, the rest of the casings are pulled out for the next step of jacking.

[0089] The main concrete working well of the rainwater and sewage pipe network is used as the starting well for the jacking construction, and the receiving well adopts a steel casing with a wall thickness of 20mm, which is simple to operate and has a fast construction speed.

[0090] The pipe sections are made of vertical glass fiber reinforced plastic pipes, which have high rigidity, simple joint processing, and can be pushed in without extruding soil. There is no need to transport soil outside during the process, and civilized construction is good on site.

[0091] The construction site is smaller, which reduces the construction blockade time, has little interference with the surrounding environment, is highly applicable to construction under complex environmental conditions, and effectively saves construction time.

[0092] The steel casing can be circulated, which greatly reduces earth excavation and reduces construction costs.

[0093] Benefit Analysis

[0094] 1) Social Benefits

[0095] The construction method of the present invention does not damage roads and existing pipelines, has low construction noise, has little impact on roads, traffic and surrounding environment, has a short construction period, truly achieves the goal of environmental protection, and fundamentally changes the traditional construction mode of first breaking the road and then building, with very high social benefits.

[0096] 2) Construction period benefits

[0097] When using pipe jacking construction, the construction of the pipe jacking working well and the prefabrication of pipe sections can be carried out simultaneously. After the pipe jacking working well is completed, the receiving well can be constructed and the pipe jacking equipment can be installed. After the receiving well is completed, the pipe jacking can be started. Each process is closely connected, the construction is not affected by extreme weather, and uninterrupted operations can be carried out, which greatly shortens the construction period and speeds up the construction progress.

[0098] 3) Economic benefits

[0099] The construction method of the present invention has a shorter construction period, requires fewer construction workers, can save various costs, reduces precipitation, soil reinforcement and other measures, avoids large-scale demolition work, reduces a large amount of site occupation, and has obvious economic benefits.

[0100] Application Examples

[0101] 1) A winery project in Huai'an City

[0102] In the 1#-2# sauce-flavor workshop and raw and auxiliary material workshop project of the intelligent brewing and aging center project in the south factory area of ​​a winery in Huai'an City, Jiangsu Province, multiple rainwater and sewage pipes in the site need to be connected with the rainwater and sewage pipes of municipal roads. Considering that open-cut construction will cause damage to the municipality, and there are many large-scale mechanical equipment such as excavators and dump trucks, which affect the passage of social vehicles and personnel, the project adopts a small-diameter glass fiber tube extrusion jacking construction process, and uses hard enclosures to close the construction area. Because the construction area required for this process is much smaller than that of open-cut construction, it reduces the interference of construction on municipal roads and damage to sidewalks. At the same time, the construction speed of this process is higher, the construction quality is better, the impact on the environment is smaller, and better social benefits have been achieved.

[0103] 2) A road project in Yancheng City

[0104] During the reconstruction of the rainwater and sewage pipelines in a municipal engineering upgrading and reconstruction project of a certain road in Yancheng City, due to the expansion of the road, a new rainwater and sewage main pipeline was built, and the rainwater and sewage branch pipes needed to be extended to the designed position. The branch pipes passed through various types of sewage, electricity, communication, water supply and other pipelines densely packed under the existing sidewalks. In addition, the geology was silty clay, which did not meet the conditions for slope excavation. Considering the complex surrounding construction environment, the extrusion type micro-jacking pipe construction was adopted for the rainwater and sewage pipeline branches, which avoided the interference of large equipment on the existing roads, reduced the construction cost and line blocking time, accelerated the construction progress, ensured the construction safety and project quality, and achieved good social and economic benefits.

[0105] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A small diameter glass fiber pipe extrusion type jacking construction method, characterized in that: The following steps are involved: S1. Construction preparation: Contact relevant pipeline management units to explore the underground power, water supply and communication pipelines at the construction site, mark their locations, and do a good job of line protection. At the same time, determine the jacking work well and receiving well according to the jacking position, determine the protection range and protection method according to the direction and length of the pipeline, conduct technical explanations to relevant technical personnel and operating levels, and organize the entry of materials and equipment, which will be used in the project after acceptance and random inspection; S2. Construction of steel casing receiving well: The receiving well adopts steel casing caisson, and the caisson construction adopts mechanical operation. The mechanical equipment used is called pipe shaking machine, and the auxiliary equipment is excavator. The wall thickness of the steel casing is 20mm, the inner diameter is 2600mm, and the length of each section of the steel casing is 2.0m. The steel casings are connected and fixed by slots + temporary welding. The lower part of the steel casing is cut into a sawtooth shape with a tooth depth of 10cm. After the pipe shaking machine installs the steel casing to the design elevation, the soil in the steel casing is taken out by an excavator. After the soil is taken, C30 concrete is immediately used to seal the bottom with a thickness of 50cm. According to the design elevation and diameter of the pipeline outlet, oxygen acetylene is used to cut the top hole on the well wall. At the same time, in order to ensure the bottom sealing requirements and the stability of the steel casing during the top pipe process, the bottom of the steel casing is embedded in the soil layer to a depth of not less than 1.0m; S3, working well and back wall installation: The jacking work well uses the main line work well for rainwater and sewage. Generally, two supporting work wells are needed for jacking, one for the jacking work well and one for the receiving well. After the work well platform is set up, the back of the jacking pipe is installed first; The structure of the mechanical jacking steel back wall is: caisson concrete (or steel casing) + back channel steel. The back channel steel is tightly attached to the jacking working well and is firmly reinforced. The back wall is a steel casing. During installation, the center of the steel casing and the axis of the jacking pipe should be adjusted to avoid eccentric pressure. S4, installation of the push machine and ejection of the pilot tube: After the jacking work pit and back concrete construction are completed, the base of the pusher and the machine, laser theodolite are installed according to the central axis of the pipeline, and a simple bracket is made and installed as a support for the pilot pipe and pipe fittings; After the laser theodolite is set up according to the center and elevation of the pipeline, the slope ratio is adjusted according to the designed slope. After the instrument is set up, the pilot pipe jacking construction begins. The pilot pipe consists of a guide head and a 1m / section It is composed of steel pipes, the pipe joints are connected by threads, and the level ruler is used to measure and correct the deviation in real time during the jacking process; S5. Pipe fittings installation: The conical transition joint is made of 1cm thick steel plate. The tip is firmly connected to the pilot pipe with a pipe clamp, and the tail is connected to the pipe fitting with a socket joint. S6, Glass fiber reinforced plastic pipe jacking: The jacking pipe is made of vertical vibrating glass fiber reinforced plastic pipe with high rigidity and light weight. The length of a single pipe section is 1m, and the allowable jacking force is less than or equal to 1000KN. During the jacking process, each section of the pipeline needs to be pushed and retracted by the cylinder. For every 1m of jacking, a section of glass fiber pipe is installed in the starting working well, and a section of the pilot pipe is removed in the receiving well. The whole jacking construction process is completed in a cycle. S7. Pipe fittings enter the receiving well: After the pipeline is constructed according to the designed length, the pipe fittings enter the receiving well, the remaining pilot pipe and transition joints are removed, and this section of pipe jacking is completed; S8. Construction of inspection well and removal of steel casing: After the jacking is completed, an inspection well is built in the jacking working shaft, the bottom plate is leveled with plain concrete, and the space between the inspection well and the steel casing is backfilled in layers with gravel and soil with a particle size not exceeding 5 cm, with a compaction degree of not less than 95%. After the backfilling is completed, except for the bottom 2m casing, the rest of the casings are pulled out for the next step of jacking.

2. A small diameter glass fiber pipe extrusion type jacking construction method according to claim 1, characterized in that: In S2, the model of the pipe shaking machine is Φ2600, and the excavator is a 200 excavator.

3. A small diameter glass fiber pipe extrusion type jacking construction method according to claim 1, characterized in that: In S3, the depth of the jacking working pit is about 30 cm below the pipe bottom elevation, and the I16 I-beam support is used as the bottom plate at the bottom of the pit.

4. A small diameter glass fiber pipe extrusion type pipe jacking construction method according to claim 3, characterized in that: The back channel steel is 20cm thick and 1.8m high.

5. The small diameter glass fiber pipe extrusion type jacking construction method according to claim 1 is characterized in that: In S4, the pilot pipe is pushed into the receiving well according to the slope set by the laser theodolite, and is pushed into place in advance by using the pilot pipe without draining the soil. The pilot pipe connects the working well and the receiving well, and then a steel circular trumpet is used to connect the pilot pipe and the pipe section, and then the pipe section is pushed in.

6. A small diameter glass fiber pipe extrusion type jacking construction method according to claim 1, characterized in that: In S6, before pushing the fiberglass pipe forward, first check whether the pilot tube, machine head, pipe joint and jack are coaxial to prevent eccentric load during pushing. When pushing the fiberglass pipe forward, follow the following procedure: install the pipe joint → turn on the oil pump to extend the piston of the jack → open the valve to return oil after the jack extends the piston to the rated length → lower the pipe.

7. A small diameter glass fiber pipe extrusion type jacking construction method according to claim 6, characterized in that: In S6, the jacking force of the fiberglass pipe needs to be estimated. The total jacking force of the pipe is calculated as follows: F0=πD1Lf k +N F Where F0-standard value of total top force (kN); D1-pipeline outer diameter (m); L-pipeline design jacking length (m); f k -Average friction between the outer wall of the pipe and the soil (kN / m 2 ); N F - Heading resistance of the pipe jacking machine (kN); D g -Outer diameter of pipe jacking machine (m); R-extrusion resistance (kN / m 2 ), can be 300~500kN / m 2 ; E—Opening ratio of extrusion bell mouth.

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