Flexible joint system of large-caliber inorganic high-performance fiber composite material jacking pipe

Abstract

The invention discloses a flexible joint system of a large-caliber inorganic high-performance fiber composite material jacking pipe. The flexible joint system comprises two sections of jacking pipes which are oppositely arranged, a steel sleeve, a middle sealing ring, two end sealing rings and two bonding parts, the steel sleeve is arranged on the opposite sides of the two sections of jacking pipes in a sleeving mode, the left side and the right side of the middle sealing ring are attached to the opposite sides of the two sections of jacking pipes respectively, the outer side periphery of the middle sealing ring is arranged on the longitudinal axis center line of the inner side of the steel sleeve in an attached mode, and one ends of the two end sealing rings are arranged on the opposite sides of the two sections of jacking pipes in a sleeving mode respectively. The end sealing rings are connected with the top pipe through bonding parts, and the other ends of the two end sealing rings are connected with the side face of the steel sleeve. A plurality of steps and a plurality of filling grooves which are annularly distributed are arranged on the outer side peripheries of the opposite sides of the jacking pipe, the steps and the filling grooves are distributed in a staggered mode, a plurality of elastic bodies are arranged on the inner side of the steel sleeve, and the elastic bodies and the filling grooves are clamped and matched in a one-to-one correspondence mode. Fatigue fracture caused by the influence of relative displacement of the jacking pipe is reduced, and connection is simple.

Description

Technical Field

[0001] The invention relates to an improvement of a flexible joint technology, belongs to the field of tunnel engineering, and in particular to a flexible joint system of a large-diameter inorganic high-performance fiber composite jacking pipe. Background Art

[0002] Pipe jacking construction is a soil underground engineering construction method developed after shield construction. It is mainly used for the construction of underground water pipes, drainage pipes, gas pipes, and telecommunication cable pipes. It does not require excavation of the surface layer, and can cross roads, railways, rivers, ground buildings, underground structures, and various underground pipelines. It is a non-excavation method for constructing underground pipelines. During construction, a pipe jacking working well and a receiving well are first made as the starting point and end point of a section of pipe jacking. There are reserved holes on one or two sides of the well wall in the working well as the outlet of the pipe jacking. The opposite well wall is the pressure-bearing wall. The front side of the pressure-bearing wall is equipped with a jacking jack and a pressure pad (i.e., a steel backrest) for the pipe jacking. The jack pushes the tool pipe out of the reserved hole in the working well, and then, with the tool pipe as the guide, the prefabricated pipe section is pushed into the soil layer section by section according to the design axis until the first section of the pipe section after the tool pipe enters the reserved hole of the receiving well, and the construction of a section of the pipeline is completed.

[0003] Through the optimization design of composite material mix ratio and the study of the close stacking of nano-calcium and nano-silicon materials, large-diameter inorganic high-performance fiber composite jacking pipes with high strength, high hardness, stable creep value, corrosion resistance, excellent carbon emission reduction and good economy are proposed. They are increasingly used in cable tunnel excavation. In the process of connecting the pipe sections in the large-diameter inorganic high-performance fiber composite jacking pipes, flexible joints are required. Under the existing technology, the flexible joint structure of the large-diameter inorganic high-performance fiber composite jacking pipe is more susceptible to fatigue fracture caused by the relative displacement of the pipe sections during use.

[0004] The Chinese patent application with application number CN202121500940.9 and application date July 3, 2021 discloses a flexible joint for a large-diameter, high-pressure fiber-reinforced flexible composite pipe, which belongs to the field of fiber-reinforced thermoplastic pipes. Its technical solution: the reinforcing layer is formed by spirally winding a fiber tape, and the reinforcing layer is a structure of at least two layers, and the spiral winding directions of the fiber tapes of adjacent layers are opposite; the filling layer is arranged between adjacent layers of the reinforcing layer, and the filling layer is composed of an elastic material that can be extruded and deformed; the fiber tape exceeds the end of the lining layer by a certain distance, and the utility model provides a thicker fiber tape, reduces the number of fiber tape windings, is conducive to the processing of fiber-reinforced flexible composite pipes, and facilitates flexible connection of pipes; it can avoid the problem of stress concentration in the reinforcing layer caused by metal joints, and at the same time solves the problem of insufficient strength of welded joints. The above-mentioned technology has the problem of insufficient strength of welded joints, but does not solve the problem of fatigue fracture of flexible joints caused by the relative displacement of pipe sections.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the problem in the prior art that the flexible joint is affected by the relative displacement of the pipe section and produces fatigue fracture, and to provide a flexible joint system for large-diameter inorganic high-performance fiber composite jacking pipes that is not affected by the relative displacement of the pipe section and produces fatigue fracture.

[0007] To achieve the above purpose, the technical solution of the present invention is: a flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe, the flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe comprising two oppositely arranged jacking pipes, a steel sleeve, an intermediate sealing ring, two end sealing rings and two bonding parts;

[0008] The steel sleeve is sleeved on the opposite sides of the two sections of the top pipe, the left and right sides of the middle sealing ring are respectively fitted with the opposite sides of the two sections of the top pipe, the outer side of the middle sealing ring is fitted on the longitudinal axis center line of the inner side of the steel sleeve, one end of the two end sealing rings is respectively sleeved on the opposite sides of the two sections of the top pipe, the end sealing rings are connected to the top pipe by an adhesive portion, and the other ends of the two end sealing rings are respectively connected to the side surfaces of the steel sleeve;

[0009] Multiple steps and multiple filling grooves distributed in an annular manner are arranged on the outer sides of the two top pipes on opposite sides, and the multiple steps and multiple filling grooves are arranged alternately. Multiple elastomers are arranged on the inner side of the steel sleeve, and the multiple elastomers and the multiple filling grooves are snap-fitted in a one-to-one correspondence.

[0010] The plurality of steps include a first step, a second step, a third step and a fourth step, and the first step, the second step, the third step and the fourth step are sequentially arranged along the top pipe to the steel sleeve;

[0011] A sealing groove is provided between the first step and the top pipe, and the side surface of the end sealing ring is embedded in the sealing groove;

[0012] A positioning groove is provided on one side of the fourth step close to the steel sleeve, and the inner ring of the middle sealing ring is embedded in the positioning groove;

[0013] The multiple filling grooves include a first filling groove set between the third step and the fourth step, a second filling groove set between the second step and the third step, and a third filling groove set between the first step and the second step. The elastomer is embedded in the first filling groove, the second filling groove, and the third filling groove in sequence.

[0014] The elastic body comprises a first filling protrusion, a second filling protrusion and a third filling protrusion. The first filling protrusion is embedded in the first filling groove, the second filling protrusion is embedded in the second filling groove, and the third filling protrusion is embedded in the third filling groove.

[0015] The depths of the first filling groove, the second filling groove, and the third filling groove increase in sequence, and the heights of the first filling protrusion, the second filling protrusion, and the third filling protrusion increase in sequence.

[0016] Adhesive is disposed between the first filling protrusion and the first filling groove, between the second filling protrusion and the second filling groove, and between the third filling protrusion and the third filling groove.

[0017] A slot penetrating the steel sleeve is provided at the center of the outer periphery of the steel sleeve, and the two positioning protrusions on the middle sealing ring are embedded in the slot.

[0018] The two positioning protrusions are symmetrically arranged, the bottom of the positioning protrusion is connected to the top of the lower cone, the bottom of the lower cone is inserted into the positioning groove, and the opposite sides of the two positioning protrusions are embedded in the slot.

[0019] One end of the positioning protrusion is provided with a filling cavity communicated with the middle sealing ring, and the filling cavity is filled with silicone oil.

[0020] A protruding ring is connected to one side of the end sealing ring close to the inner wall of the sealing groove, and the bonding portion is arranged in a gap formed between the side wall of the protruding ring and the inner wall of the sealing groove.

[0021] The inner wall of the end sealing ring is provided with a plurality of internal teeth distributed at equal distances.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In a flexible joint system of a large-caliber inorganic high-performance fiber composite jacking pipe of the present invention, a steel sleeve is set on the opposite sides of two sections of the jacking pipe, the left and right sides of the middle sealing ring are respectively fitted with the opposite sides of the two sections of the jacking pipe, the outer side of the middle sealing ring is fitted on the longitudinal axis center line of the inner side of the steel sleeve, one end of the two end sealing rings is respectively set on the opposite sides of the two sections of the jacking pipe, the end sealing rings and the jacking pipe are connected by an adhesive portion, and the other ends of the two end sealing rings are respectively connected to the side of the steel sleeve. When used, through the matching setting between the jacking pipe and the steel sleeve, after the large-caliber inorganic high-performance fiber composite jacking pipe is connected to the flexible joint, when a relative position occurs during the advancement of the jacking pipe, the connection between the elastic body and the matching groove of the steel sleeve can be used, thereby improving the correction ability of the jacking pipe, and at the same time, it can also reduce the fatigue fracture of the flexible joint caused by the relative displacement of the jacking pipe during use. Therefore, the present invention reduces the fatigue fracture caused by the relative displacement of the jacking pipe, and the connection is simple.

[0024] 2. In a flexible joint system of a large-caliber inorganic high-performance fiber composite jacking pipe of the present invention, two symmetrical positioning protrusions are arranged on the outer periphery of the middle sealing ring, the bottom of the positioning protrusion is connected to the top of the lower cone, the bottom of the lower cone is inserted into the positioning groove, and the opposite sides of the two positioning protrusions are embedded in the slot. When used, the middle sealing ring and the end sealing rings are arranged so that after the large-caliber inorganic high-performance fiber composite jacking pipe is connected to the flexible joint, the middle sealing ring and the end sealing rings can be used to seal the flexible joint and the jacking pipe, thereby improving the anti-seepage and water-stopping effects between the flexible joint and the jacking pipe. Therefore, the present invention has a good sealing effect and can be waterproof.

[0025] 3. In the flexible joint system of a large-caliber inorganic high-performance fiber composite material jacking pipe of the present invention, the elastic deformation of the elastic body can be used to correct the deviation of the jacking pipe, and the elastic body can have multiple parts to correct the deviation of the jacking pipe by using the first filling protrusion, the second filling protrusion and the third filling protrusion, or by changing the number of protrusions in the elastic body to increase or decrease, thereby improving the correction ability of the flexible joint to the jacking pipe. Therefore, the present invention can correct the deviation and improve the stability of the flexible joint connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 The present invention Figure 1 Enlarged view of point A in the middle.

[0028] Figure 3 It is a cross-sectional view of the present invention.

[0029] Figure 4 It is a structural schematic diagram of the jacking pipe in the present invention.

[0030] Figure 5 It is a structural schematic diagram of the steel sleeve in the present invention.

[0031] Figure 6 It is a structural schematic diagram of the middle sealing ring in the present invention.

[0032] Figure 7 It is a structural schematic diagram of the positioning protrusion in the present invention.

[0033] Figure 8 It is a structural schematic diagram of the end sealing ring in the present invention.

[0034] In the figure: top pipe 1, positioning groove 11, first filling groove 12, second filling groove 13, third filling groove 14, sealing groove 15, first step 16, second step 17, third step 18, fourth step 19, steel sleeve 2, slot 21, first filling protrusion 22, second filling protrusion 23, third filling protrusion 24, middle sealing ring 3, positioning protrusion 31, lower cone 311, filling cavity 312, end sealing ring 4, raised ring 41, internal teeth 42, bonding part 5. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] See also Figures 1 to 8 A flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe, a flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe, the flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe comprising two oppositely arranged jacking pipes 1, a steel sleeve 2, an intermediate sealing ring 3, two end sealing rings 4 and two bonding parts 5;

[0037] The steel sleeve 2 is sleeved on the opposite sides of the two sections of the top pipe 1, the left and right sides of the middle sealing ring 3 are respectively fitted with the opposite sides of the two sections of the top pipe 1, the outer side of the middle sealing ring 3 is fitted on the longitudinal axis center line of the inner side of the steel sleeve 2, one end of the two end sealing rings 4 is respectively sleeved on the opposite sides of the two sections of the top pipe 1, the end sealing rings 4 are connected to the top pipe 1 through the bonding part 5, and the other ends of the two end sealing rings 4 are respectively connected to the side of the steel sleeve 2;

[0038] The outer sides of the two top pipes 1 on the opposite sides are provided with a plurality of steps B and a plurality of filling grooves C distributed in an annular manner, and the plurality of steps B and the plurality of filling grooves C are arranged alternately. The inner side of the steel sleeve 2 is provided with a plurality of elastomers D, and the plurality of elastomers D and the plurality of filling grooves C are snap-fitted with each other in a one-to-one correspondence.

[0039] The plurality of steps B include a first step 16, a second step 17, a third step 18 and a fourth step 19, which are sequentially arranged along the top pipe 1 to the steel sleeve 2;

[0040] A sealing groove 15 is provided between the first step 16 and the top pipe 1, and the side surface of the end sealing ring 4 is embedded in the sealing groove 15;

[0041] The fourth step 19 is provided with a positioning groove 11 on one side close to the steel sleeve 2, and the inner ring of the middle sealing ring 3 is embedded in the positioning groove 11;

[0042] The multiple filling grooves include a first filling groove 12 set between the third step 18 and the fourth step 19, a second filling groove 13 set between the second step 17 and the third step 18, and a third filling groove 14 set between the first step 16 and the second step 17. The elastomer D is embedded in the first filling groove 12, the second filling groove 13, and the third filling groove 14 in sequence.

[0043] The elastic body D includes a first filling protrusion 22 , a second filling protrusion 23 and a third filling protrusion 24 . The first filling protrusion 22 is embedded in the first filling groove 12 , the second filling protrusion 23 is embedded in the second filling groove 13 , and the third filling protrusion 24 is embedded in the third filling groove 14 .

[0044] The depths of the first filling groove 12 , the second filling groove 13 , and the third filling groove 14 increase in sequence, and the heights of the first filling protrusion 22 , the second filling protrusion 23 , and the third filling protrusion 24 increase in sequence.

[0045] Adhesive is disposed between the first filling protrusion 22 and the first filling groove 12 , between the second filling protrusion 23 and the second filling groove 13 , and between the third filling protrusion 24 and the third filling groove 14 .

[0046] A slot 21 penetrating the steel sleeve 2 is provided at the center of the outer periphery of the steel sleeve 2 , and two positioning protrusions 31 on the middle sealing ring 3 are embedded in the slot 21 .

[0047] The two positioning protrusions 31 are symmetrically arranged, the bottom of the positioning protrusion 31 is connected to the top of the lower cone 311, the bottom of the lower cone 311 is inserted into the positioning groove 11, and the opposite sides of the two positioning protrusions 31 are embedded in the slot 21.

[0048] One end of the positioning protrusion 31 is provided with a filling cavity 312 which is in communication with the middle sealing ring 3 , and the filling cavity 312 is filled with silicone oil.

[0049] A protruding ring 41 is connected to one side of the end sealing ring 4 close to the inner wall of the sealing groove 15 , and the adhesive portion 5 is disposed in a gap formed between the side wall of the protruding ring 41 and the inner wall of the sealing groove 15 .

[0050] The inner wall of the end sealing ring 4 is provided with a plurality of internal teeth 42 which are distributed at equal distances.

[0051] Embodiment 1:

[0052] A flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe, a flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe, the flexible joint system for the large-diameter inorganic high-performance fiber composite jacking pipe comprises two sections of jacking pipes 1 arranged opposite to each other, a steel sleeve 2, an intermediate sealing ring 3, two end sealing rings 4 and two bonding parts 5; the steel sleeve 2 is sleeved on the opposite sides of the two sections of the jacking pipe 1, the left and right sides of the intermediate sealing ring 3 are respectively fitted with the opposite sides of the two sections of the jacking pipe 1, and the outer side of the intermediate sealing ring 3 is fitted on the steel sleeve 2 On the inner longitudinal axis center line, one ends of the two end sealing rings 4 are respectively sleeved on the opposite sides of the two sections of the top pipe 1, the end sealing ring 4 is connected to the top pipe 1 through an adhesive portion 5, and the other ends of the two end sealing rings 4 are respectively connected to the side of the steel sleeve 2; the outer sides of the two opposite sides of the top pipes 1 are provided with a plurality of steps B and a plurality of filling grooves C distributed in an annular manner, and the plurality of steps B and the plurality of filling grooves C are arranged alternately, and a plurality of elastomers D are provided on the inner side of the steel sleeve 2, and the plurality of elastomers D and the plurality of filling grooves C are snap-fitted one by one.

[0053] When applying:

[0054] The opposite sides of the two sections of the top pipe 1 are coaxially aligned, and the steel sleeve 2 is sleeved on the outer sides of the opposite sides of the two sections of the top pipe 1. The middle sealing ring 3 is pre-arranged in the middle of the steel sleeve 2. In the process of sleeved on the outer sides of the opposite sides of the two sections of the top pipe 1, the middle sealing ring 3 is located between the two sections of the top pipe 1. The two end sealing rings 4 are pre-fixedly connected with the steel sleeve 2 on one side facing the steel sleeve 2. In the process of sleeved on the outer sides of the opposite sides of the two sections of the top pipe 1, the two end sealing rings 4 are respectively sleeved on the outer sides of the two sections of the top pipe 1 and separated by the steel sleeve 2. The end sealing rings 4 and the top pipe 1 can be bonded and fixed by using the bonding part 5; the steel sleeve 2 and the top pipe 1 are also bonded and fixed by using an adhesive.

[0055] Embodiment 2:

[0056] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0057] The outer side of the top pipe 1 is provided with annular steps, which include a first step 16, a second step 17, a third step 18 and a fourth step 19, which are arranged in sequence from the top pipe 1 to the steel sleeve 2; a sealing groove 15 is arranged between the first step 16 and the top pipe 1, and the side of the end sealing ring 4 is embedded in the sealing groove 15; a positioning groove 11 is arranged on the side of the fourth step 19 close to the steel sleeve 2, and the inner ring of the middle sealing ring 3 is embedded in the positioning groove 11; a first filling groove 12 is arranged between the third step 18 and the fourth step 19, a second filling groove 13 is arranged between the second step 17 and the third step 18, a third filling groove 14 is arranged between the first step 16 and the second step 17, and the steel sleeve 2 The inner circumference is sequentially embedded in the first filling groove 12, the second filling groove 13, and the third filling groove 14; the inner side of the steel sleeve 2 is sequentially provided with a first filling protrusion 22, a second filling protrusion 23 and a third filling protrusion 24, the first filling protrusion 22 is embedded in the first filling groove 12, the second filling protrusion 23 is embedded in the second filling groove 13, and the third filling protrusion 24 is embedded in the third filling groove 14; the depths of the first filling groove 12, the second filling groove 13, and the third filling protrusion 24 increase sequentially, and the heights of the first filling protrusion 22, the second filling protrusion 23, and the third filling protrusion 24 increase sequentially; an adhesive is provided between the first filling protrusion 22 and the first filling groove 12, between the second filling protrusion 23 and the second filling groove 13, and between the third filling protrusion 24 and the third filling groove 14.

[0058] When applied: the first filling protrusion 22, the second filling protrusion 23 and the third filling protrusion 24 can all be made of elastic rubber material, and the elastic deformation thereof can be used to correct the deviation of the top pipe 1. In addition, by using the first filling protrusion 22, the second filling protrusion 23 and the third filling protrusion 24, or by increasing or decreasing the number of protrusions in the elastic body, the elastic body can have multiple parts for correcting the top pipe 1, thereby improving the correction ability of the flexible joint for the top pipe. By using the first filling protrusion 22, the second filling protrusion 23 and the third filling protrusion 24, or by increasing or decreasing the number of protrusions in the elastic body, and making the protrusions in the elastic body have different thicknesses, the correction margin of the flexible joint for the top pipe can be adjusted and increased, and the fatigue fracture of the elastic body can be reduced. By using the cooperation between the filling protrusion and the filling groove, a better seal can be formed between the top pipe 10 and the flexible joint, thereby improving the anti-seepage and water-stopping effects between the flexible joint and the top pipe 10.

[0059] Embodiment 3:

[0060] Embodiment 3 is substantially the same as Embodiment 1, except that:

[0061] A slot 21 penetrating the steel sleeve 2 is provided at the center of the outer periphery of the steel sleeve 2, and one end of the intermediate sealing ring 3 is embedded in the slot 21; two symmetrical positioning protrusions 31 are provided on the outer periphery of the intermediate sealing ring 3, and the bottom of the positioning protrusion 31 is connected to the top of the lower cone 311, and the bottom of the lower cone 311 is inserted into the positioning groove 11, and the opposite sides of the two positioning protrusions 31 are embedded in the slot 21; one end of the positioning protrusion 31 is provided with a filling cavity 312 connected to the intermediate sealing ring 3, and the filling cavity 312 is filled with silicone oil.

[0062] When applying:

[0063] The middle sealing ring 3 can be made of a water-swellable material so that it expands and fills the gap between the two sections of the jacking pipe 1 after contacting water. The middle sealing ring 3 can use its deformation ability to assist in correcting the jacking pipe 1 that has undergone relative displacement.

[0064] Embodiment 4:

[0065] Embodiment 4 is substantially the same as Embodiment 1, except that:

[0066] The used jacking pipe 10 can be used for full-scale test of inorganic high-performance fiber composite jacking pipe - theoretical load, wherein the maximum crack width of high-performance concrete is:

[0067] w fmax =(0.4~0.5)w max

[0068] Where: w max is the maximum crack width of ordinary reinforced concrete flexural members without considering the influence of steel fibers (mm); β w is the steel fiber influence coefficient, which should be determined through experiments. When there is no test data, 0.4 can be used for calculation. When the calculated value is less than 0.3, 0.3 can be used for calculation. The coefficient for considering the curing conditions is 1.0 for normal temperature curing without humid heat, and 1.15 for humid heat steam curing; f is the characteristic parameter of steel fiber content. In this test material, the steel fiber volume content is 2%, the aspect ratio is 65, and λ f =0.02×65=1.3.

[0069] In the actual test, a jacking pipe with an outer diameter of 2.88m, an inner diameter of 2.5m, and a wall thickness of 180mm was selected;

[0070] Let w fmax =0.4w max =0.2mm, w max =0.5mm

[0071] The crack load and failure load can be calculated by a three-point test according to the Test Methods for Concrete and Reinforced Concrete Drainage Pipes GB / T16752-2006, and it can be calculated that the crack load is 180kN / m and the failure load is 360kN / m.

[0072] The outer diameter is 2.88m, the inner diameter is 2.5m, and the wall thickness is 180mm. The theoretical calculation of the preliminary crack load of the composite top pipe under the three-point load method is 180kN / m, and the failure load is 360kN / m; the full-scale test measured its crack load to be 224kN / m, and the failure load is 438kN / m, which meets the requirements of the theoretical crack load and ultimate load. It can be seen that the C150 top pipe reaches the level of ordinary C50 concrete grade III pipe, with an outer diameter of 2.88m, an inner diameter of 2.4m, a wall thickness of 230mm, a crack load of 217kN / m, and a failure load of 326kN / m. In particular, the ultimate load is higher than that of ordinary C50 concrete grade III pipe, which verifies the high strength and high crack resistance of inorganic high-performance composite cable top pipes, and provides scientific support for the practical application of subsequent projects. The 180mm wall thickness of the C150 cable jacking pipe can be reduced by 21.7% compared to the 230mm wall thickness of the conventional C50 jacking pipe, the amount of steel bars can be reduced by 30%, the weight can be reduced by 20%, and the space inside the pipe can be increased by 8%, which provides favorable conditions for optimizing construction and cable layout and reflects good application prospects.

[0073] Embodiment 5:

[0074] Embodiment 5 is substantially the same as Embodiment 4, except that:

[0075] In this embodiment, the jacking pipe meets the following design specifications:

[0076] 1. Design standards

[0077] 1) Designed working life: 100 years, safety level 1, environmental category: 2b.

[0078] 2) Highest groundwater level: designed ground elevation.

[0079] 3) Jacking pipe specifications: The outer diameter of the composite C150 jacking pipe is 2.86m.

[0080] 4) Pipe section suitable for covering depth: <10m.

[0081] 5) Road and greening load: vehicle load is Class A or ground overload 20kN / m.

[0082] 2. Engineering Materials

[0083] 1) The concrete strength grade is C150 and the impermeability grade is P30; the elastic modulus is not less than 45GPa; the design value of the axial compressive strength is 71MPa; and the design value of the axial tensile strength is 4.6MPa.

[0084] a. Cementitious material: ordinary Portland cement, 42.5R grade;

[0085] b. Admixture: active mineral admixture, activity index greater than 105%;

[0086] c. Fine aggregate: particle size 0.15-2.36mm, silicon dioxide content not less than 95%;

[0087] d. Nanomaterials: nano calcium and nano silicon;

[0088] e. Chemical enhancer: water reduction rate greater than 25%;

[0089] f. Ultrafine metal fiber: The diameter is 0.18-0.23mm, and the tensile strength is not less than 2000MPa.

[0090] The volume content of the fiber is not less than 2%;

[0091] g. The maximum oxygen ion content shall not exceed 0.06% and the maximum alkali content shall not exceed 3.0kg / m3.

[0092] 2) Steel: RB400 grade steel fyk = 400N / mm, PB300 grade steel fyk = 300N / mm.

[0093] 3) The socket steel sleeve ring and the plug steel ring are made of Q355 grade low alloy structural steel.

[0094] 4) During construction, when the temperature is higher than 15℃, use chloroprene rubber ring, and when it is lower than 15℃, use EPDM rubber ring.

[0095] 5) Thickness of C150 pipe jacking concrete protective layer: 25mm inside, 35mm outside;

[0096] 6) The pre-prepared groove shall be CAG-50x26 groove in "Pre-buried groove steel" (GB / T-2019);

[0097] 7) All exposed iron parts of civil engineering must be rust-proofed and treated with hot-dip galvanizing;

[0098] 8) The factory strength of the pipe joint shall not be less than 100% of the design strength.

[0099] 3. Anchorage length and lap length of stressed steel bars

[0100] 1) Steel bar connections can be made by tying, lap jointing, mechanical connection or welding. Mechanical connection or welding joints should be preferred for stress-bearing steel bar joints. Steel bars with a diameter greater than or equal to 25 mm should be mechanically connected or welded. Joints of stress-bearing steel bars should be set at locations with less stress, and fewer joints should be set on the same stress-bearing steel bar. The joint positions of stress-bearing steel bars should be staggered, and the percentage of joint area within the same connection section length should meet the requirements of the specification.

[0101] (1) The length of the connection area of ​​the steel bar binding lap joint is 1.3 times the lap length.

[0102] (2) The length of the connection section of the mechanical connection joint is 35d, where d is the smaller diameter of the connected steel bar.

[0103] (3) The length of the steel bar welded joint in the connection area is 35d and not less than 500mm, where d is the smaller diameter of the connected steel bar.

[0104] 2) The steel bar connectors used in this project must meet the requirements of joints with mechanical property grade I: the tensile strength of the joint is equal to the actual breaking strength of the connected steel bars or not less than 1.1 times the standard value of the steel bar tensile strength, with small residual deformation and high ductility and repeated tension and compression performance.

[0105] 3) The seismic anchorage length of longitudinal tensile reinforcement is recommended to be no less than 15d.

[0106] This invention patent is designed to meet the needs of large-diameter inorganic high-performance fiber composite jacking pipes, and a new type of flexible joint structure is designed. This structure can meet the requirements of strong impermeability, large correction margin and adaptability to curve jacking. Through in-depth research on the mechanical properties and failure forms of the joints, the waterproofness and mechanical properties of the joint structure are analyzed through theoretical calculations, and experimental tests are carried out to verify. Finally, the design scheme provided by this application is proposed, which clarifies the structural form, sealing mechanism, stress distribution, etc. of the joint, so that it has good impermeability, sufficient correction margin and curve adaptability, while ensuring that the bearing capacity of the joint meets the requirements.

[0107] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A flexible joint system for a large-caliber inorganic high-performance fiber composite jacking pipe, characterized in that: The flexible joint system of the large-caliber inorganic high-performance fiber composite jacking pipe comprises two sections of jacking pipes (1) arranged opposite to each other, a steel sleeve (2), an intermediate sealing ring (3), two end sealing rings (4) and two bonding parts (5); The steel sleeve (2) is sleeved on the opposite sides of the two sections of the top pipe (1), the left and right sides of the middle sealing ring (3) are respectively fitted with the opposite sides of the two sections of the top pipe (1), the outer side of the middle sealing ring (3) is fitted on the longitudinal axis center line of the inner side of the steel sleeve (2), one end of the two end sealing rings (4) are respectively sleeved on the opposite sides of the two sections of the top pipe (1), the end sealing rings (4) and the top pipe (1) are connected by an adhesive portion (5), and the other ends of the two end sealing rings (4) are respectively connected to the side surfaces of the steel sleeve (2); Multiple steps (B) and multiple filling grooves (C) are arranged in an annular manner on the outer sides of the two top pipes (1) on opposite sides, and the multiple steps (B) and the multiple filling grooves (C) are arranged alternately. Multiple elastic bodies (D) are arranged on the inner side of the steel sleeve (2), and the multiple elastic bodies (D) and the multiple filling grooves (C) are snap-fitted in a one-to-one correspondence.

2. A flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 1, characterized in that: The plurality of steps (B) include a first step (16), a second step (17), a third step (18) and a fourth step (19), and the first step (16), the second step (17), the third step (18) and the fourth step (19) are sequentially arranged from the top pipe (1) to the steel sleeve (2); A sealing groove (15) is provided between the first step (16) and the top pipe (1), and the side surface of the end sealing ring (4) is embedded in the sealing groove (15); A positioning groove (11) is provided on a side of the fourth step (19) close to the steel sleeve (2), and an inner ring of the intermediate sealing ring (3) is embedded in the positioning groove (11); The plurality of filling grooves (C) include a first filling groove (12) arranged between the third step (18) and the fourth step (19), a second filling groove (13) arranged between the second step (17) and the third step (18), and a third filling groove (14) arranged between the first step (16) and the second step (17); and the elastic body (D) is sequentially embedded in the first filling groove (12), the second filling groove (13), and the third filling groove (14).

3. The flexible joint system of a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 2, characterized in that: The elastic body (D) comprises a first filling protrusion (22), a second filling protrusion (23) and a third filling protrusion (24); the first filling protrusion (22) is embedded in the first filling groove (12), the second filling protrusion (23) is embedded in the second filling groove (13), and the third filling protrusion (24) is embedded in the third filling groove (14).

4. A flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 3, characterized in that: The depths of the first filling groove (12), the second filling groove (13), and the third filling groove (14) increase sequentially, and the heights of the first filling protrusion (22), the second filling protrusion (23), and the third filling protrusion (24) increase sequentially.

5. The flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 4, characterized in that: Adhesive is provided between the first filling protrusion (22) and the first filling groove (12), between the second filling protrusion (23) and the second filling groove (13), and between the third filling protrusion (24) and the third filling groove (14).

6. The flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 2, characterized in that: A slot (21) penetrating the steel sleeve (2) is provided at the center of the outer periphery of the steel sleeve (2), and the two positioning protrusions (31) on the middle sealing ring (3) are embedded in the slot (21).

7. The flexible joint system for large-diameter inorganic high-performance fiber composite jacking pipe according to claim 6, characterized in that: The two positioning protrusions (31) are symmetrically arranged, the bottom of the positioning protrusion (31) is connected to the top of the lower cone (311), the bottom of the lower cone (311) is inserted into the positioning groove (11), and the opposite sides of the two positioning protrusions (31) are embedded in the slot (21).

8. The flexible joint system for large-diameter inorganic high-performance fiber composite jacking pipe according to claim 7, characterized in that: One end of the positioning protrusion (31) is provided with a filling cavity (312) which is in communication with the middle sealing ring (3), and the filling cavity (312) is filled with silicone oil.

9. The flexible joint system for large-diameter inorganic high-performance fiber composite jacking pipe according to claim 2, characterized in that: A protruding ring (41) is connected to one side of the end sealing ring (4) close to the inner wall of the sealing groove (15), and the bonding portion (5) is arranged in a gap formed between the side wall of the protruding ring (41) and the inner wall of the sealing groove (15).

10. A flexible joint system for a large-diameter inorganic high-performance fiber composite jacking pipe according to claim 9, characterized in that: The inner wall of the end sealing ring (4) is provided with a plurality of internal teeth (42) distributed at equal distances.

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