Rectangular pipe jacking curve pipe section, its manufacturing method and curve pipe section assembly

Abstract

The present invention relates to a rectangular pipe jacking curved pipe segment, a manufacturing method thereof and a curved pipe segment assembly, which are used for curved pipe jacking projects. The rectangular pipe jacking curved pipe segment has a flat top plate, a bottom plate and a curved side wall. The rectangular pipe jacking curved pipe segment includes: a concrete frame, which is an outer frame of the concrete curved pipe segment; an internal steel member, which is arranged inside the concrete frame and includes a conventional steel reinforcement cage arranged in the flat top plate and the bottom plate and a steel section row arranged in the curved side wall. And the steel section row is formed by vertically splicing n steel sections of the same model (n≥2) in sequence at an angle θ (θ<90°) and welding at the splicing position, and the angle θ is a welding angle. The present invention solves the problems in the prior art that a broken line is used instead of a curve, resulting in pipe joint dislocation, reduced end contact area and greatly reduced bearing capacity. At the same time, there is no need to set a curved steel reinforcement cage on the side, which simplifies the prefabrication difficulty while increasing the compressive, bending and torsional resistance and other properties of the pipe jacking pipe segment.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking construction, and particularly relates to a rectangular pipe jacking curve pipe joint, a manufacturing method thereof, and a curve pipe joint assembly. Background Art

[0002] In recent years, with the acceleration of the process of underground space development and utilization, as a key trenchless technology, the pipe jacking method has been widely applied, and pipe jacking tunnels are developing in the direction of long distance and large diameter spatial curves.

[0003] In the design and construction process of pipe jacking, due to reasons such as the difference in geological conditions, the environmental protection requirements of ground buildings, and the disturbance impact on existing underground structures, the route of the project is often forced to be a curve. Traditional curve pipe jacking uses the broken line formed during the jacking process of the pipe joint to replace the required curve. However, when passing through the curve section, an included angle will be formed between the pipe joints, the contact area at the end of the pipe joint becomes smaller, and the bearing capacity will be greatly reduced. Therefore, an elastic annular cushion plate is often set between the pipe joints to compensate for the position change between the pipe joints. During the jacking process, the deviation is generally corrected manually by the deviation correction device of the pipe jacking machine to form a curve. However, when the radius of curvature is small or the formation is relatively soft, it is difficult to achieve an ideal effect only relying on the deviation correction device of the pipe jacking machine itself. Therefore, an auxiliary undulating device is often continuously set between the last three pipe joints of the pipe jacking machine, and an included angle is forcibly formed between the pipe joints through the undulating hydraulic cylinder.

[0004] It can be seen that the jacking method of traditional curve pipe jacking is complex and not easy to operate, the probability of pipe joint disconnection is large, the permeability and sealing performance at the disconnection of the pipe joint are poor, and the engineering safety is difficult to guarantee. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the main purpose of the present invention is to provide a rectangular pipe jacking curve pipe joint, a manufacturing method thereof, and a curve pipe joint assembly to solve one or more problems such as pipe joint disconnection, poor structural safety of the pipe joint, and cumbersome and complex construction technology in the prior art of curve pipe jacking.

[0006] The technical solution of the present invention is as follows:

[0007] In the first aspect of the present invention, a rectangular pipe jacking curve pipe joint for a curve pipe jacking project is provided, which has a flat top plate, a bottom plate, and a curved side wall. The rectangular pipe jacking curve pipe joint includes: a concrete frame, which is an outer frame of the concrete curve pipe joint; an internal steel member, which is arranged inside the concrete frame, including a conventional steel reinforcement cage arranged in the flat top plate and the bottom plate, and a steel section row arranged in the curved side wall; and the steel section row is composed of n steel section segments of the same model (n≥2) vertically spliced in sequence at an included angle θ (θ<90°) and welded at the splicing position, and the included angle θ is the welding angle.

[0008] Preferably, the steel section row is an angle steel row, which is formed by vertically and sequentially splicing n right-angled equal-angle steel sections of the same model (n≥2) at the bottom corners at an angle θ (θ<90°) and welding at the splicing points.

[0009] Preferably, the welding angle θ is:

[0010]

[0011] In the formula, θ is the welding angle, β is the deviation angle of the curved pipe jacking, and n is the number of right-angled equal-angle steel sections of the angle steel row.

[0012] Preferably, the openings of the right-angled equal-angle steel sections of the angle steel row face the outside of the curved pipe section, and the angle bisector of each right-angled equal-angle steel section is always consistent with the direction of the radius of curvature of the curved pipe section, and the curvature of the curved pipe section is consistent with the curvature of the curved pipe jacking.

[0013] Preferably, the built-in steel member further includes a steel section reinforcement member, and the steel section reinforcement member is welded and fixed at the outer top corners of the angle steel row.

[0014] Preferably, the steel section reinforcement member is an I-beam, and the I-beam is welded and fixed vertically at the outer top corners of the angle steel row, and the web of the I-beam is along the radius direction of the curvature of the curved pipe section.

[0015] On the other hand, the present invention provides a method for manufacturing a rectangular pipe jacking curved pipe section, including the following steps: S1: Design the curved pipe jacking according to the design specifications, select the type of angle steel and process the angle steel sections; S2: Determine the deviation angle β of the curved pipe jacking from the connection line of the head and tail end points of the curved pipe jacking; S3: Calculate the welding angle θ of the angle steel row from the deviation angle β; S4: Customize a welding pedestal according to the angle steel row and the welding angle θ; S5: Weld the angle steel row on the welding pedestal; S6: Install the conventional steel reinforcement cage and the angle steel row, pour the concrete frame, and the manufacturing is completed.

[0016] Preferably, the welding pedestal is a concrete pedestal, including a pedestal body and at least two right-angled grooves formed on the pedestal body, and the adjacent right-angled sides of the two right-angled grooves are connected, and the included angle formed by the two right-angled sides is the welding angle θ.

[0017] Preferably, at least one end of the pedestal body in the longitudinal direction of the angle steel row is at least partially closed.

[0018] On yet another aspect, the present invention provides a rectangular pipe jacking curved pipe section assembly, and the rectangular pipe jacking curved pipe section assembly is composed of multiple rectangular pipe jacking curved pipe sections connected end to end.

[0019] The beneficial effects of the present invention compared with the prior art are as follows: The purpose of the rectangular pipe jacking curve pipe segment, its manufacturing method and the curve pipe segment assembly proposed by the present invention is to better achieve the accuracy of the curve pipe jacking trajectory, and solve the problems in the prior art that using broken lines instead of curves leads to misalignment of pipe segments, smaller end contact area, and a significant reduction in bearing capacity. At the same time, there is no need to set a bent steel reinforcement cage on the side, which simplifies the prefabrication difficulty while enhancing the compressive, flexural and torsional resistance performance of the pipe jacking pipe segment.

[0020] The specially designed welding die (bench) ensures the accuracy of the welding angle and effectively solves the control problem of the welding angle of the angle steel row.

[0021] By controlling the welding angle of the angle steel row, the accuracy of the curve pipe jacking trajectory can be greatly improved.

[0022] The opening of the angle steel row faces the outside of the pipe segment, and the angle bisector of each angle steel is always consistent with the direction of the radius of curvature of the curve pipe segment, which can ensure that the angle steel row can bear the greater earth pressure brought by the soil on the side wall of the curve pipe segment, and can better bear the bending moment of the soil pressure stress on the side wall of the pipe jacking on the pipe segment.

[0023] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above beneficial effects need to be achieved simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0025] The structures, ratios, sizes, etc. shown are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0026] Figure 1 Overall schematic diagram of the curve pipe segment of an embodiment of the present invention;

[0027] Figure 2 Top view of the curve pipe segment of an embodiment of the present invention;

[0028] Figure 3 Structural schematic diagram of the angle steel row of an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the angle steel row welding angle derivation process for an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the angle steel + I-beam row structure for an embodiment of the present invention, where (a) is the design drawing and (b) is the model drawing;

[0031] Figure 6 Schematic cross-sectional view of the welding pedestal for an embodiment of the present invention, where (a) shows the angle steel placed and (b) shows no angle steel placed;

[0032] Figure 7 Top view of the welding pedestal for an embodiment of the present invention. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more understandable, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0034] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] It should be understood that terms such as "including / containing", "consisting of...", or any other variant are intended to cover non-exclusive inclusion, so that a product, device, process, or method including a series of elements not only includes those elements, but also includes other elements that are not clearly listed when needed, or also includes elements inherent in such a product, device, process, or method. Without more limitations, the elements defined by the statement "including / containing...", "consisting of..." do not exclude the existence of additional identical elements in the product, device, process, or method including the said elements.

[0036] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device, component or structure must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation to the present invention.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0038] Currently, in the pipe jacking project, the stress state of the side wall of the straight pipe section is simple and linearly distributed, while the stress state of the side wall of the curved pipe section is complex and greatly affected by the engineering geological conditions, often posing extremely high requirements for the performance of the pipe section such as compressive strength, flexural strength, and torsional resistance. At the same time, the traditional jacking method for curved pipe jacking is complex and not easy to operate, with a high probability of pipe joint disconnection, poor permeability and sealing, and it is difficult to ensure the engineering safety.

[0039] In the existing underground pipe jacking projects, the pipe sections are all straight sections. When a curved pipe jacking project needs to be constructed, straight pipe sections are still used for construction, and gaskets are added to make the straight pipe sections form broken lines and corners instead of manufacturing curved pipe sections. This is because the stiffening members in the concrete of the pipe jacking pipe sections usually use steel cages. On the one hand, the manufacturing process of the bent steel cage is very complex and the angle is not easy to control. On the other hand, the mechanical properties of the steel bars are damaged after bending and are not suitable for complex engineering geological conditions. While the processing and manufacturing of profiled steel, especially profiled steel sections / segments within a certain length range, are much easier and the angle is easy to control.

[0040] Based on this, the present invention proposes an improved structure for the curved pipe section of rectangular pipe jacking, which is formed by connecting profiled steel through welding or other means to form a profiled steel row, aiming to solve the problems such as pipe joint disconnection, poor structural safety of the curved pipe section, and cumbersome and complex construction technology in the traditional curved pipe jacking technology.

[0041] The following describes the implementation of the present invention in detail in combination with preferred embodiments.

[0042] See Figure 1 、 Figure 2, an embodiment of the present invention provides a rectangular pipe jacking curved pipe joint for curved pipe jacking. As shown in the figure, the rectangular pipe jacking curved pipe joint has a flat top plate 1, a bottom plate 2, and a curved side wall 3. The surfaces of the top plate 1 and the bottom plate 2 are flat, which is no different from a conventional rectangular pipe jacking. The side wall 3 is curved, specifically, it gradually bends from one end of the pipe jacking pipe joint to the other end, and more specifically, it is curved in an arc shape, and the curvature always remains consistent, which should be consistent with the curvature of the curved pipe jacking project. In the project, a fixed curvature is determined according to the general layout drawing of the pipe jacking design to ensure that the curvatures of all pipe joints are consistent, so as to construct an underground project that meets the requirements.

[0043] In the present invention, the rectangular pipe jacking curved pipe joint includes a concrete frame and an internal steel member. The concrete frame is an outer frame of a concrete curved pipe joint manufactured according to specifications and meeting the design dimensions and models. The aforementioned top plate 1, bottom plate 2, and side wall 3 are all formed by the concrete frame to form an outer load-bearing member. The internal steel member is used to enhance the mechanical properties such as compression resistance, bending resistance, and torsion resistance of the curved pipe joint.

[0044] Preferably, the cement grade of the concrete frame is not lower than 425 Portland cement, ordinary Portland cement, or slag Portland cement. Since it cannot be lower than 425 Portland cement, the cement performance should comply with the provisions of GB-175, GB-199, GB-748, and GB-1344.

[0045] Preferably, the maximum particle size of the gravel in the concrete frame shall not be lower than 1 / 3 of the wall thickness and shall not be greater than 3 / 4 of the clear distance of the circumferential steel bars. Fine aggregate is preferably hard medium sand, and the fineness modulus M1 is 2.3 - 3.0.

[0046] Preferably, the concrete frame is allowed to add admixtures and additives. When fly ash is used as an admixture, it should comply with the provisions of GB-1596 and GBJ-28. When additives are used, it should comply with the provisions of GB-8076 and GBJ-119. When other admixtures are used, it should comply with the provisions of other corresponding standards.

[0047] Preferably, the concrete mixing water for the concrete frame should comply with the GBJ-63 standard.

[0048] Continue to refer to Figure 1 , the internal steel member 4 is arranged inside the concrete frame, including a conventional steel cage arranged in the flat top plate 1 and the bottom plate 2, and a steel bar row 4 arranged in the curved side wall 3.

[0049] It should be noted that Figure 1 the steel cage is not shown in the figure. The design of the conventional steel cage should comply with the relevant requirements of the concrete design code and the pipe jacking project design code. In addition, only a partial concrete frame of the side wall 3 in the figure is shown to clearly show the structure and layout of the steel bar row 4 inside it.

[0050] Preferably, the steel bars of the conventional steel reinforcement cage should adopt low-carbon steel bars for general use, plain steel bar tying discs, and cold-drawn and cold-rolled low-carbon threaded steel bars, and should comply with the relevant provisions of GB-343, JC / T540 and other design specifications for pipe jacking projects.

[0051] In the present invention, in combination with Figure 3 , the profiled steel row is formed by vertically splicing n profiled steel segments of the same model (n≥2) at an angle θ (θ<90°) in sequence and welding at the splicing position, and the angle θ is the welding angle.

[0052] It can be easily foreseen that in the present invention, by using the profiled steel row to replace the steel reinforcement cage on the side wall of the traditional curved pipe jacking, the profiled steel itself has higher stiffness and strength than the steel reinforcement cage, increasing its compressive, bending, torsion resistance and other properties. At the same time, it avoids the processing and production of the curved steel reinforcement cage, and simplifies the prefabrication difficulty of the pipe jacking pipe section. By controlling the welding angle of the profiled steel row when arranging the profiled steel row, the track accuracy of the curved pipe jacking can be greatly improved, and the construction difficulty is reduced while ensuring the solution of its mechanical property technical problems.

[0053] In the present invention, taking the angle steel segment as an example, continue to refer to Figure 3 , the profiled steel row is an angle steel row, which is formed by vertically splicing n right-angle equal-angle steel segments of the same model (n≥2) at the bottom angle at an angle θ (vertical θ<90°) in sequence and welding at the splicing position. The angle steel segment is easier to process and manufacture, and it is easier to weld at a certain angle at the bottom angle to form a curved structure.

[0054] Refer to Figure 4 , the welding angle θ is obtained according to the following method:

[0055] In ①, two right-angle equal-angle steel segments are vertically spliced in a straight line. For a straight pipe section, there is no deviation angle (i.e., the deviation angle β = 0°) of the angle steel row on the side wall of the pipe section, and the welding angle θ = 90°.

[0056] In ②, for a curved pipe section, when the number of angle steel segments of the angle steel row on the side wall of the pipe section is 2 (i.e., n = 2), the extension line of the bottom edge of the first angle steel segment is a horizontal line, the welding angle θ<90°, α = 90° - θ, and α = 2β, so there is:

[0057]

[0058] In the formula, β is the included angle between the connection line of the head and tail endpoints of the angle steel row and the horizontal line, and α is the included angle between the bottom edge of the second angle steel segment and the horizontal line.

[0059] In ③, for a curved pipe section, when the number of angle steel segments of the angle steel row on the side wall of the pipe section is 3 (i.e., n = 3), the welding angle θ<90°, α = 90° - θ, and η = 2α, η = 2β, so there is:

[0060]

[0061] In the formula, β is the angle between the connecting line of the head and tail endpoints of the angle steel row and the horizontal line, α is the angle between the hypotenuse of the second angle steel section and the horizontal line, and η is the angle between the bottom edge of the last angle steel section and the horizontal line.

[0062] In ④, for the curved pipe section, when the number of angle steel sections of the angle steel row on the side wall of the pipe section is 4 (i.e., n = 4), the welding angle θ < 90°, α = 90° - θ, and η = 3α, η = 2β. Therefore, we have:

[0063]

[0064] In the formula, β is the angle between the connecting line of the head and tail endpoints of the angle steel row and the horizontal line, α is the angle between the bottom edge of the second angle steel section and the horizontal line, and η is the angle between the bottom edge of the last angle steel section and the horizontal line.

[0065] From this, it can be deduced that when the number of angle steel sections of the angle steel row on the side wall of the curved pipe section is n and the welding angle is θ (θ < 90°), the relationship between the welding angle θ and the deviation angle β satisfies:

[0066]

[0067] In the formula, θ is the welding angle, β is the deviation angle of the curved pipe jacking, and n is the number of right-angled equal-angle steel sections of the angle steel row.

[0068] In this way, in actual engineering, according to the design parameters (curvature), the angle between the connecting line of the head and tail endpoints of the curved pipe jacking and the horizontal line, that is, the deviation angle β, can be obtained. At the same time, by combining the length of the pipe section and the model of the angle steel section to determine the number of angle steel sections of the angle steel row, the welding angle θ of the angle steel section can be calculated. Without considering construction errors, the curvature of the welded angle steel row is exactly the same as the designed curvature of the curved pipe jacking, which can well realize the accuracy of the curved pipe jacking trajectory and ensure the project quality.

[0069] In the present invention, continue to refer to Figure 3 , the openings of the right-angled equal-angle steel sections of the angle steel row face the outside of the curved pipe section, and the angle bisector of each right-angled equal-angle steel section is always consistent with the direction of the radius of curvature of the curved pipe section. The curvature of the curved pipe section is the same as the curvature of the curved pipe jacking. In this way, it can be ensured that the angle steel row can bear the greater earth pressure brought by the soil on the side wall of the curved pipe section and can better bear the bending moment action of the earth pressure stress on the side wall of the pipe jacking on the pipe section.

[0070] In some cases, under the conditions of high seismic fortification intensity, long service life, or poor geological conditions, etc., which have extremely high requirements for the compressive, bending, and torsional resistance of the curved pipe section, it is necessary to particularly enhance the mechanical properties and stability of the curved pipe section. The present invention further conducts enhanced design on the internal steel components, such as Figure 5As shown in the figure, a steel section reinforcement member 5 is added. The steel section reinforcement member 5 is welded and fixed at the outer top corner of the angle steel row. Specifically, it can be welded and fixed together with the angle steel row at the top corner.

[0071] The steel section reinforcement member 5 is preferably an I-beam. Taking the I-beam as an example, the I-beam is welded and fixed vertically at the outer top corner of the angle steel row. Specifically, the center of the flange plate on the side of the I-beam close to the angle steel row contacts and is welded and fixed at the outer top corner of the angle steel row, and the web of the I-beam is along the radius direction of the curvature of the curved pipe section. In this way, the operation difficulty and engineering cost of simply using the I-beam as the steel section row are reduced, and it is more operable to control the welding angle with the angle steel row. At the same time, the web of the I-beam is along the radius direction of the curvature of the curved pipe section, and the bending and torsion resistance effect is better than that perpendicular to the radius direction of the curvature.

[0072] It should be noted that the implementation method of combining the angle steel and the I-beam is only two better methods among many side wall stress components of the curved pipe section. Other steel section types and their combinations can also be used as components that meet the mechanical property requirements.

[0073] The embodiment of the present invention further provides a manufacturing method of a rectangular pipe jacking curved pipe section. The following takes the angle steel as an example to elaborate on each link in detail.

[0074] S1: Design the curved pipe jacking according to the design specifications. The curvature of the curved pipe section can be determined from the general drawing of the curved pipe jacking design. This curvature is a fixed curvature, and the curvatures of each curved pipe section are the same. The design specifications mainly include the design specifications for reinforced concrete, the design specifications for pipe jacking, the seismic design specifications, etc.

[0075] After the engineering design of the curved pipe jacking is completed, select the angle steel and process the angle steel sections; the selection mainly includes selecting the model, thickness, material, etc. of the angle steel according to the length, side wall thickness, bearing capacity, etc. of the curved pipe section.

[0076] S2: Determine the deviation angle β of the curved pipe jacking from the connection line of the head and tail end points of the curved pipe jacking; the specific determination method of the deviation angle β will not be repeated here.

[0077] S3: After the deviation angle β is determined, calculate the welding angle θ of the angle steel row; the calculation method of the welding angle θ will not be repeated here.

[0078] S4: Customize the welding pedestal according to the angle steel row and the welding angle θ.

[0079] In the present invention, the control of the welding angle of the angle steel row is a difficult problem of the present invention. The accuracy of the welding angle is directly related to the curvature of the obtained angle steel row. Therefore, a suitable welding die (pedestal) is required to ensure the accuracy of the welding angle. As Figure 6As shown in the figure, the present invention provides a welding pedestal 6, which is a concrete pedestal, including a pedestal body 61 and at least two right-angled grooves 62 formed on the pedestal body 61. The adjacent right-angled sides of the two right-angled grooves 62 are connected, and the included angle formed by the two right-angled sides, that is, the included angle of the middle protrusion of the pedestal, is also the welding angle θ. The size of this included angle is calculated by formula 1 according to the deviation angle of the curved pipe section in the actual project. To ensure contact during the welding of the two angle steels, the side lengths of the welding angle of the middle protrusion of the pedestal, that is, the two side lengths of the right-angled groove 62, need to be equal to the right-angled side lengths of the right-angled equal-angle steel.

[0080] In the present invention, one end of the welding pedestal 6 is a non-grooved part, forming a stop portion 63, as Figure 7 shown, at least one end of the pedestal body 61 in the longitudinal direction of the angle steel row is at least partially closed, that is to say, the right-angled groove 62 of the welding pedestal 6 does not penetrate at least one end of the pedestal body 61. In this way, it can play a role of stopping and limiting, preventing the longitudinal movement or dislocation of the angle steel section during welding in the groove. During welding, the two angle steel sections are respectively placed in the left and right grooves of the pedestal, and the welding method of butt welding with a V-shaped groove plate is adopted, as Figure 3 in which 41 is the fillet weld.

[0081] S5: Weld the angle steel row on the welding pedestal, and an anti-corrosion coating can be applied to the angle steel row as needed.

[0082] In the present invention, the side wall angle steels of the curved pipe jacking are welded to form an angle steel row. Due to the length of the angle steel, the welding method of butt welding with a V-shaped groove plate is adopted. During welding, a sawtooth-shaped electrode movement technique can be used for welding. During welding, it is fast in the middle and slightly pauses on both sides. When the welding torch swings to the middle, the welding torch is pushed towards the included angle, so that the included angle can be fully fused and enough filler can be filled.

[0083] In the present invention, the welding of the angle steel row adopts the welding method of carbon dioxide gas shielded welding. This welding method has the advantages of high welding productivity, low welding cost, small welding deformation, high welding quality, wide application range, and simple operation. The general model of the welding machine is NBC-350, with a rated output current of 350A. The angle steel is placed on the mold with the opening facing up. Before welding, the area within 20 mm around the groove must be cleaned, and then the blunt edge is filed and repaired with a file.

[0084] S6: Install the conventional steel reinforcement cage and the angle steel row, pour the concrete frame, let it stand, cure, and the production is completed. After completion, anti-corrosion and anti-seepage coatings can be further applied to the concrete pipe section as needed.

[0085] Based on the rectangular pipe jacking curved pipe section, the present invention also provides a rectangular pipe jacking curved pipe section assembly, which is composed of multiple rectangular pipe jacking curved pipe sections connected end to end.

[0086] The construction method based on the above-mentioned rectangular pipe-jacking curve pipe joint assembly of the present invention is as follows:

[0087] S1: Transfer the rectangular pipe-jacking curve pipe joints to the construction site and hoist them. A protective structure to prevent the transverse displacement of the pipe joints shall be installed between the pipe joints according to the specifications, and the curve pipe joints shall be jacked in one by one according to the curve pipe-jacking engineering specifications;

[0088] S2: During the jacking process, the whole process path, deflection, settlement, waterproof and anti-seepage shall be monitored, and the jacking thrust shall be adjusted in time and the deviation shall be corrected in time.

[0089] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rectangular pipe jacking curved pipe section for a curved pipe jacking project, having a planar top plate, a bottom plate, and a curved side wall, characterized in that, The rectangular pipe jacking curve pipe segment includes: A concrete frame, which is the outer frame of the concrete curve pipe segment; Built-in steel members, which are arranged inside the concrete frame, including a conventional steel reinforcement cage arranged in the flat roof and floor, and an angle steel row arranged in the curved side wall; and The angle steel row is formed by vertically splicing n right-angle equal-angle steel segments of the same model in sequence at the bottom angle with an included angle θ and welding at the splicing position. Wherein, the included angle θ is the welding angle, θ < 90°, n is the number of right-angle equal-angle steel segments, and n ≥ 2; and The welding angle θ is: ； In the formula, β is the deviation angle of the curve pipe jacking; The openings of the right-angle equal-angle steel segments of the angle steel row face the outside of the curve pipe segment, and the angle bisector of each right-angle equal-angle steel segment is always consistent with the direction of the radius of curvature of the curve pipe segment. The curvature of the curve pipe segment is consistent with the curvature of the curve pipe jacking.

2. The rectangular pipe jacking curve pipe section according to claim 1, wherein: The built-in steel member further includes a profiled steel reinforcement member, and the profiled steel reinforcement member is welded and fixed at the outer top corner of the angle steel row.

3. The rectangular pipe jacking curved pipe segment according to claim 2, characterized in that: The profiled steel reinforcement member is an I-beam, and the I-beam is welded and fixed at the outer top corner of the angle steel row along the vertical direction, and the web of the I-beam is along the radius direction of the curvature of the curve pipe segment.

4. A manufacturing method of the rectangular pipe-jacking curve pipe section according to any one of claims 1 to 3, characterized in that, It includes the following steps: S1: Design the curve pipe jacking according to the design specifications, select the type of angle steel and process the right-angle equal-angle steel segments; S2: Determine the deviation angle β of the curve pipe jacking from the connection line of the head and tail end points of the curve pipe jacking; S3: Calculate the welding angle θ of the angle steel row from the deviation angle β; S4: Customize the welding pedestal according to the angle steel row and the welding angle θ; S5: Weld the angle steel row on the welding pedestal; S6: Install the conventional steel reinforcement cage and the angle steel row, pour the concrete frame, and the production is completed.

5. The manufacturing method according to claim 4, characterized in that: The welding pedestal is a concrete pedestal, including a pedestal body and at least two right-angle grooves formed on the pedestal body. The adjacent right-angle sides of the two right-angle grooves are connected, and the included angle formed by the two right-angle sides is the welding angle θ.

6. The manufacturing method according to claim 5, characterized in that: At least one end of the pedestal body in the longitudinal direction of the angle steel row is at least partially closed.

7. A rectangular pipe jacking curved pipe joint assembly, characterized in that: The rectangular pipe jacking curve pipe segment assembly is composed of multiple rectangular pipe jacking curve pipe segments described in any one of claims 1 to 3 connected end to end.

Images