UHPC jacking pipe and preparation method thereof

Abstract

The invention discloses a UHPC jacking pipe and a preparation method thereof.The UHPC jacking pipe is prepared from P.I cement, quick-hardening sulphoaluminate cement, composite slag powder, silica fume, preprocessed steel fibers, a crystal nucleus early strength agent, quartz sand, a viscosity reducer, powdery carboxylic acid, a dispersing agent and a wetting rheological agent, compared with a pipeline made of common concrete, the UHPC jacking pipe is lighter and thinner, the overall weight can be reduced, and the service life of the UHPC jacking pipe is prolonged. Transportation and installation are convenient; secondly, the UHPC jacking pipe is better in permeation resistance and better in corrosion resistance; hydrating is accelerated through the quick-hardening sulphoaluminate cement, good early strength can be provided, and the formwork turnover rate is increased; the crystal nucleus early strength agent can effectively accelerate the manufacturing period of the UHPC jacking pipe; the introduced composite slag powder is lower in carbon and energy-saving, the viscosity of the UHPC is effectively reduced, and the fluidity is good. The inner wall is smooth and not prone to deposition of sundries, and the service life of the pipeline is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal drainage pipes, and more specifically, to a UHPC jacking pipe and a preparation method thereof. Background Art

[0002] After a long period of operation, the municipal drainage network is prone to various diseases such as blockage, corrosion, collapse and deformation. There are many reasons for the disease: lax acceptance during construction and maintenance leads to the presence of construction slag and other remains, and the rough surface of cement pipes leads to the stagnation of debris in sewage, which reduces the pipe diameter and causes blockage; the phenomenon of digging wells instead of trenches during pipeline maintenance is common, leading to long-term siltation in the pipes; the direct dumping of kitchen oil into the municipal pipe network without treatment will lead to the formation of thick oil scale on the inner wall of the pipes. In addition, sewage contains various harmful substances such as acids and alkalis, which are easy to corrode cement pipes, thus greatly reducing the service life of the pipes. In severe cases, it will cause damage to the road surface and buildings.

[0003] At present, the commonly used pipes for municipal drainage pipes are: reinforced concrete pipes, metal pipes, plastic pipes, glass fiber reinforced plastic sand-filled pipes and reinforced concrete glass fiber reinforced plastic composite pipes. The characteristics of various pipes are as follows: reinforced concrete pipes are cheap, simple to produce, easy to obtain materials locally, and are widely used. However, they have poor corrosion resistance, short pipe sections, more interfaces, larger inner wall roughness, heavy weight and high installation costs. Metal pipes mainly include ductile iron pipes and steel pipes. The advantages of metal pipes are strong texture, good compression resistance, earthquake resistance and impermeability; smooth inner wall and low roughness; disadvantages are large pipe section length, fewer joints and high installation costs. Plastic pipes mainly include rigid polyvinyl chloride pipes, rigid polyvinyl chloride pipe double-wall corrugated pipes, polyethylene double-wall corrugated pipes, polyethylene winding structure wall pipes, steel belt reinforced polyethylene spiral corrugated pipes, polyethylene steel-plastic composite winding pipes and polypropylene winding structure wall pipes; plastic pipes have smooth inner walls, low roughness, corrosion resistance, low weight, convenient installation and low cost, but they have low impact resistance and a large thermal expansion coefficient. The inner wall of the FRP sand-filled pipe is smooth, with low roughness, good sealing, light weight, easy installation and low cost; it has good anti-corrosion performance, no worries about electrical corrosion, and can be directly buried in acidic or alkaline soil without protection; but as a semi-flexible pipe, the pipe itself has poor ability to withstand external pressure, and its strength is more easily damaged than metal materials, requiring higher technical requirements for foundation treatment and backfill construction. The outer layer of the reinforced concrete FRP composite pipe is pressure-bearing, and the inner lining of the FRP layer is anti-corrosion and anti-seepage, with low roughness, corrosion resistance, shorter pipe sections, more interfaces, greater deadweight, and high installation costs.

[0004] Therefore, in view of the problems of existing drainage pipes, such as poor anti-penetration and corrosion resistance, rough inner walls that are easy to deposit debris, and thick pipes that are difficult to construct, this scheme improves the existing drainage pipes and provides a UHPC jacking pipe and a preparation method thereof. Summary of the invention

[0005] The present invention discloses a UHPC jacking pipe, comprising the following raw materials calculated by weight:

[0006] 25-40 parts by weight of PI cement, 1-5 parts by weight of rapid hardening sulphoaluminate cement, 25-35 parts by weight of composite slag powder, 10-25 parts by weight of silica fume, 2-3 parts by weight of pre-processed steel fiber, 1-3 parts by weight of crystal nucleus early strength agent, 30-45 parts by weight of quartz sand, 0.5-1 parts by weight of viscosity reducer, 1-2 parts by weight of powdered carboxylic acid, 0.2-0.5 parts by weight of dispersant, and 0.1-0.2 parts by weight of wetting rheological agent.

[0007] Preferably, the composite slag powder includes any one or more of steel slag, water slag or lithium slag.

[0008] Preferably, the pre-processed steel fiber is formed by bending steel fiber, and an interface agent is sprayed on the surface of the pre-processed steel fiber.

[0009] Preferably, the crystal nucleus early strength agent includes a calcareous raw material, a siliceous raw material and PCE; the calcareous raw material includes any one or more of calcium nitrate, calcium nitrite or calcium chloride; the siliceous raw material includes any one or two of sodium silicate or potassium silicate.

[0010] A method for preparing a UHPC jacking pipe comprises the following steps:

[0011] Step S1: PI cement, rapid hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent are mixed and stirred to obtain a premix;

[0012] Step S2: adding water to the premix according to the weight ratio of 100:8-15=premix:water, and continuing stirring for 8-10 minutes to obtain UHPC material;

[0013] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0014] Step S4: demoulding 3 to 4 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe;

[0015] Step S5: Cooling the top pipe after steaming to room temperature;

[0016] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0017] Preferably, the preparation process of the crystal nucleus early strengthening agent in step S1 is as follows:

[0018] Preparation of calcium solution: taking calcium raw material and dissolving it into calcium solution with a concentration of 8%;

[0019] Preparation of silica solution: dissolving silica raw material into 10% silica solution;

[0020] Preparation of base material: PCE and PEG are used to prepare a base material with a concentration of 1%, wherein the weight average molecular weight of PCE is 15000 and the weight average molecular weight of PEG is 600-1000, and then the base material is placed in a high-speed stirring container;

[0021] The calcium solution and the silicon solution are added dropwise at a ratio of 1:1 into a high-speed stirring container containing the base material and stirred at a speed of more than 800 r / min.

[0022] Preferably, iron sulfate or aluminum sulfate is added dropwise during the stirring process as a doping and modification material to improve the surface adsorption capacity.

[0023] Preferably, the preparation process of the pre-processed steel fiber is as follows: steel fiber is selected, the steel fiber is pickled, bent, and surface-sprayed with an interface agent to enhance surface roughness and improve grip strength.

[0024] Preferably, the powdered carboxylic acid is a polycarboxylic acid water reducer, and its water reduction rate is not less than 25%.

[0025] Preferably, the preparation process of the composite slag powder is as follows: select any one or more of steel slag, water slag or lithium slag, add a modifier and a grinding aid, mix and grind together to obtain the composite slag powder.

[0026] The UHPC jacking pipe of the present invention is made of PI cement, fast-hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent. Compared with the pipe made of ordinary concrete, its thickness is thinner and lighter, which can reduce the overall weight and facilitate transportation and installation. Secondly, the UHPC jacking pipe has better anti-permeability and corrosion resistance. The fast-hardening sulphoaluminate cement accelerates hydration, provides better early strength and improves the template turnover rate. The crystal nucleus early strength agent can effectively accelerate the UHPC jacking pipe production cycle. The introduction of composite slag powder is more low-carbon and energy-saving, effectively reduces the viscosity of UHPC, and has good fluidity.

[0027] The UHPC jacking pipe manufactured by the preparation method provided by the present invention is lighter than the existing ordinary concrete, has strong supporting force, excellent compressive performance, and a wide range of applications; it has good anti-penetration and corrosion resistance, and the inner wall is smooth and not easy to deposit debris, which effectively improves the service life of the pipeline. DETAILED DESCRIPTION

[0028] The invention discloses a UHPC jacking pipe and a preparation method thereof. The UHPC jacking pipe is manufactured by adopting PI cement, fast-hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent. The UHPC jacking pipe has the performance advantages of high strength, high toughness and high durability, is lighter than the existing ordinary concrete, has strong supporting force, excellent compressive performance, and a wide range of applications; has good anti-penetration and corrosion resistance, a smooth inner wall that is not easy to deposit debris, and effectively improves the service life of the pipeline.

[0029] The technical solutions in the embodiments of the present invention are described clearly and in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The invention discloses a UHPC jacking pipe, which comprises the following raw materials calculated by weight: 25-40 parts by weight of PI cement, 1-5 parts by weight of rapid hardening sulphoaluminate cement, 25-35 parts by weight of composite slag powder, 10-25 parts by weight of silica fume, 2-3 parts by weight of pre-processed steel fiber, 1-3 parts by weight of crystal nucleus early strength agent, 30-45 parts by weight of quartz sand, 0.5-1 parts by weight of viscosity reducer, 1-2 parts by weight of powdered carboxylic acid, 0.2-0.5 parts by weight of dispersant, and 0.1-0.2 parts by weight of wetting rheological agent.

[0031] UHPC (Ultra-High Performance Concrete) is ultra-high performance concrete. UHPC has extremely high compressive strength, tensile strength and excellent durability, and can maintain stable performance in various extreme environments. The UHPC jacking pipe of the present invention controls the addition ratio of various raw materials to make its microstructure more compact, thereby improving its mechanical properties. The production cycle of UHPC jacking pipe is accelerated by the crystal nucleus early strength agent, and the introduction of a large amount of composite slag powder is more low-carbon and energy-saving, effectively reducing the viscosity of UHPC and improving fluidity; the coating of silane-modified impregnated materials further improves the anti-seepage effect of the cylinder; by introducing fast-hardening cement, hydration is accelerated, and better early strength can be provided, and the turnover rate of the formwork is improved. The tensile strength and toughness of UHPC are improved by introducing pre-processed steel fibers. These pre-processed steel fibers form a stable three-dimensional network structure in UHPC, which effectively prevents the expansion and extension of cracks.

[0032] Preferably, the mixed sand is prepared by compounding pretreated sea sand, graded quartz sand and graded machine-made sand, and the fineness modulus value of the mixed sand is 2.3 to 2.8;

[0033] Preferably, the composite slag powder includes any one or more of steel slag, water slag or lithium slag.

[0034] Preferably, the pre-processed steel fiber is formed by bending steel fiber, and an interface agent is sprayed on the surface of the pre-processed steel fiber.

[0035] Preferably, the crystal nucleus early strength agent includes a calcareous raw material, a siliceous raw material and PCE; the calcareous raw material includes any one or more of calcium nitrate, calcium nitrite or calcium chloride; the siliceous raw material includes any one or two of sodium silicate or potassium silicate.

[0036] A method for preparing a UHPC jacking pipe comprises the following steps:

[0037] Step S1: PI cement, rapid hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent are mixed and stirred to obtain a premix;

[0038] Step S2: adding water to the premix according to the weight ratio of 100:8-15=premix:water, and continuing stirring for 8-10 minutes to obtain UHPC material;

[0039] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0040] Step S4: demoulding 3 to 4 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe;

[0041] Step S5: Cooling the top pipe after steaming to room temperature;

[0042] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0043] The UHPC jacking pipe prepared through the above steps can make the jacking pipe thinner. For example, if it is made of ordinary concrete with a thickness of 8cm, it only needs a thickness of 6cm to achieve excellent performance when made of UHPC material, and it has better anti-penetration performance and is more corrosion-resistant.

[0044] By adopting the above steps to prepare UHPC jacking pipe, it also has the following advantages:

[0045] 1. Accelerate the production cycle of UHPC pipe jacking through the crystal nucleus early strength agent;

[0046] 2. By introducing a large amount of composite slag powder, it is more energy-efficient and can effectively reduce the viscosity of UHPC and improve fluidity;

[0047] 3. The anti-seepage effect of the cylinder is further improved by coating with silane-modified impregnated materials.

[0048] 4. By introducing fast-hardening cement, hydration can be accelerated, which can provide better early strength and improve the turnover rate of the formwork.

[0049] Preferably, the preparation process of the crystal nucleus early strengthening agent in step S1 is as follows:

[0050] Preparation of calcium solution: taking calcium raw material and dissolving it into calcium solution with a concentration of 8%;

[0051] Preparation of silica solution: dissolving silica raw material into 10% silica solution;

[0052] Preparation of base material: PCE and PEG are used to prepare a base material with a concentration of 1%, wherein the weight average molecular weight of PCE is 15000 and the weight average molecular weight of PEG is 600-1000, and then the base material is placed in a high-speed stirring container;

[0053] Add the calcium solution and silicon solution in a ratio of 1:1 to a high-speed stirring container containing the base material and stir at a speed of more than 800r / min. This product has the effect of quickly improving strength and greatly shortening demoulding time. The crystal nucleus early strength agent can speed up the turnover of the template and improve construction efficiency.

[0054] Preferably, iron sulfate or aluminum sulfate is added dropwise during the stirring process as a doping and modification material to improve the surface adsorption capacity.

[0055] Preferably, the preparation process of the pre-processed steel fiber is as follows: steel fiber is selected, the steel fiber is pickled, bent, and surface-sprayed with an interface agent to enhance surface roughness and improve grip strength.

[0056] Preferably, the powder carboxylic acid is a polycarboxylic acid water reducer, and its water reduction rate is not less than 25%. The powder carboxylic acid is a high-performance powder carboxylic acid, and has the characteristics of high water reduction rate, less air entrainment and low viscosity.

[0057] Preferably, the preparation process of the composite slag powder is as follows: select any one or more of steel slag, water slag or lithium slag, add a modifier and a grinding aid, mix and grind together to obtain the composite slag powder.

[0058] The UHPC jacking pipe of the present invention is made of PI cement, fast-hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent. Compared with the pipe made of ordinary concrete, its thickness is thinner and lighter, which can reduce the overall weight and facilitate transportation and installation. Secondly, the UHPC jacking pipe has better anti-permeability and corrosion resistance. The fast-hardening sulphoaluminate cement accelerates hydration, provides better early strength and improves the template turnover rate. The crystal nucleus early strength agent can effectively accelerate the UHPC jacking pipe production cycle. The introduction of composite slag powder is more low-carbon and energy-saving, effectively reduces the viscosity of UHPC, and has good fluidity.

[0059] The UHPC jacking pipe manufactured by the preparation method provided by the present invention is lighter than the existing ordinary concrete, has strong supporting force, excellent compressive performance, and a wide range of applications; it has good anti-penetration and corrosion resistance, and the inner wall is smooth and not easy to deposit debris, which effectively improves the service life of the pipeline.

[0060] The following is described through multiple embodiments:

[0061] Embodiment 1:

[0062] The preparation method of UHPC jacking pipe includes the following steps:

[0063] Step S1: 25-40 parts by weight of PI cement, 1-5 parts by weight of rapid hardening sulphoaluminate cement, 25-35 parts by weight of composite slag powder, 10-25 parts by weight of silica fume, 2-3 parts by weight of pre-processed steel fiber, 1-3 parts by weight of crystal nucleus early strength agent, 30-45 parts by weight of quartz sand, 0.5-1 parts by weight of viscosity reducer, 1-2 parts by weight of powdered carboxylic acid, 0.2-0.5 parts by weight of dispersant, and 0.1-0.2 parts by weight of wetting rheological agent are mixed and stirred to obtain a premix;

[0064] Step S2: adding water to the premix according to the weight ratio of 100:8-15=premix:water, and continuing stirring for 8-10 minutes to obtain UHPC material;

[0065] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0066] Step S4: demoulding 3 to 4 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe;

[0067] Step S5: Cooling the top pipe after steaming to room temperature;

[0068] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0069] Embodiment 2:

[0070] The preparation method of UHPC jacking pipe includes the following steps:

[0071] Step S1: 25 parts by weight of PI cement, 1 part by weight of rapid hardening sulphoaluminate cement, 25 parts by weight of composite slag powder, 10 parts by weight of silica fume, 2 parts by weight of pre-processed steel fiber, 1 part by weight of crystal nucleus early strength agent, 30 parts by weight of quartz sand, 0.5 parts by weight of viscosity reducer, 1 part by weight of powdered carboxylic acid, 0.2 parts by weight of dispersant, and 0.1 parts by weight of wetting rheological agent are mixed and stirred to obtain a premix;

[0072] Step S2: adding water to the premix according to the weight ratio of 100:8 = premix: water, and continuing stirring for 8 minutes to obtain UHPC material;

[0073] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0074] Step S4: demoulding 3 hours after the pouring is completed, placing in a 50°C steam curing environment, steam curing for 6 hours, and obtaining a jacking pipe;

[0075] Step S5: Cooling the top pipe after steaming to room temperature;

[0076] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0077] Embodiment 3:

[0078] The preparation method of UHPC jacking pipe includes the following steps:

[0079] Step S1: 32.5 parts by weight of PI cement, 3 parts by weight of rapid hardening sulphoaluminate cement, 30 parts by weight of composite slag powder, 17.5 parts by weight of silica fume, 2.5 parts by weight of pre-processed steel fiber, 2 parts by weight of crystal nucleus early strength agent, 37.5 parts by weight of quartz sand, 0.75 parts by weight of viscosity reducer, 1.5 parts by weight of powdered carboxylic acid, 0.35 parts by weight of dispersant, and 0.15 parts by weight of wetting rheological agent are mixed and stirred to obtain a premix;

[0080] Step S2: adding water to the premix in a weight ratio of 100:11.5 = premix: water, and continuing stirring for 9 minutes to obtain UHPC material;

[0081] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0082] Step S4: demoulding 3.5 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe;

[0083] Step S5: Cooling the top pipe after steaming to room temperature;

[0084] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0085] Embodiment 4:

[0086] The preparation method of UHPC jacking pipe includes the following steps:

[0087] Step S1: 40 parts by weight of PI cement, 5 parts by weight of rapid hardening sulphoaluminate cement, 35 parts by weight of composite slag powder, 25 parts by weight of silica fume, 3 parts by weight of pre-processed steel fiber, 3 parts by weight of crystal nucleus early strength agent, 45 parts by weight of quartz sand, 1 part by weight of viscosity reducer, 2 parts by weight of powdered carboxylic acid, 0.5 parts by weight of dispersant, and 0.2 parts by weight of wetting rheological agent are mixed and stirred to obtain a premix;

[0088] Step S2: adding water to the premix in a weight ratio of 100:15 = premix: water, and continuing stirring for 10 minutes to obtain UHPC material;

[0089] Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process;

[0090] Step S4: demoulding 4 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe;

[0091] Step S5: Cooling the top pipe after steaming to room temperature;

[0092] Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

[0093] The UHPC jacking pipe and the preparation method thereof provided by the present invention are introduced in detail above. For those skilled in the art, according to the idea of ​​the embodiments of the present invention, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A UHPC jacking pipe, characterized in that: The following raw materials are included in parts by weight: 25-40 parts by weight of PI cement, 1-5 parts by weight of rapid hardening sulphoaluminate cement, 25-35 parts by weight of composite slag powder, 10-25 parts by weight of silica fume, 2-3 parts by weight of pre-processed steel fiber, 1-3 parts by weight of crystal nucleus early strength agent, 30-45 parts by weight of quartz sand, 0.5-1 parts by weight of viscosity reducer, 1-2 parts by weight of powdered carboxylic acid, 0.2-0.5 parts by weight of dispersant, and 0.1-0.2 parts by weight of wetting rheological agent.

2. The UHPC jacking pipe according to claim 1, characterized in that: The composite slag powder includes any one or more of steel slag, water slag or lithium slag.

3. The UHPC jacking pipe according to claim 1, characterized in that: The pre-processed steel fiber is formed by bending steel fiber, and an interface agent is sprayed on the surface of the pre-processed steel fiber.

4. The UHPC jacking pipe according to claim 1, characterized in that: The crystal nucleus early strength agent includes a calcium raw material, a silicon raw material and PCE; the calcium raw material includes any one or more of calcium nitrate, calcium nitrite or calcium chloride; the silicon raw material includes any one or two of sodium silicate or potassium silicate.

5. The method for preparing a UHPC jacking pipe according to any one of claims 1 to 4, characterized in that: The following steps are included: Step S1: PI cement, rapid hardening sulphoaluminate cement, composite slag powder, silica fume, pre-processed steel fiber, crystal nucleus early strength agent, quartz sand, viscosity reducer, powder carboxylic acid, dispersant and wetting rheological agent are mixed and stirred to obtain a premix; Step S2: adding water to the premix according to the weight ratio of 100:8-15=premix:water, and continuing stirring for 8-10 minutes to obtain UHPC material; Step S3: placing the UHPC material in a steel mesh cage mold for pouring, and turning on a lateral vibration motor to vibrate and remove bubbles during the pouring process; Step S4: demoulding 3 to 4 hours after the pouring is completed, placing in a 50° C. steam curing environment for 6 hours to obtain a jacking pipe; Step S5: Cooling the top pipe after steaming to room temperature; Step S6: The inner wall of the jacking pipe is coated with silane-modified impregnated permeable material to obtain a UHPC jacking pipe.

6. The method for preparing a UHPC jacking pipe according to claim 5, characterized in that: The preparation process of the crystal nucleus early strength agent in step S1 is as follows: Preparation of calcium solution: taking calcium raw material and dissolving it into calcium solution with a concentration of 8%; Preparation of silica solution: dissolving silica raw material into 10% silica solution; Preparation of base material: PCE and PEG are used to prepare a base material with a concentration of 1%, wherein the weight average molecular weight of PCE is 15000 and the weight average molecular weight of PEG is 600-1000, and then the base material is placed in a high-speed stirring container; The calcium solution and the silicon solution are added dropwise at a ratio of 1:1 into a high-speed stirring container containing the base material and stirred at a speed of more than 800 r / min.

7. The method for preparing a UHPC jacking pipe according to claim 6, characterized in that: During the stirring process, iron sulfate or aluminum sulfate is added as a doping modification material to improve the surface adsorption capacity.

8. The method for preparing a UHPC jacking pipe according to claim 5, characterized in that: The preparation process of the pre-processed steel fiber is as follows: steel fiber is selected, the steel fiber is pickled, bent, and an interface agent is sprayed on the surface to enhance the surface roughness and improve the gripping force.

9. The method for preparing a UHPC jacking pipe according to claim 5, characterized in that: The powder carboxylic acid is a polycarboxylic acid water reducer, and its water reduction rate is not less than 25%.

10. The method for preparing a UHPC jacking pipe according to claim 5, characterized in that: The preparation process of the composite slag powder is as follows: any one or more of steel slag, water slag or lithium slag is selected, and a modifier and a grinding aid are added, and the mixture is mixed and ground to obtain the composite slag powder.