Hydraulic engineering steel pipe inner wall concrete pipe

Abstract

The invention belongs to the technical field of hydraulic engineering, and particularly relates to a hydraulic engineering steel pipe inner wall concrete pipe which comprises a steel pipe and a concrete pipe wall coaxially and fixedly connected to the outer side of the steel pipe. The front end and the tail end of the concrete pipe wall are respectively provided with an inserting part and a splicing part, and the splicing part of the previous concrete pipe wall is spliced and fixedly connected with the inserting part of the next concrete pipe wall; and the tail end of the front steel pipe is fixedly connected with the front end of the rear steel pipe. Compared with a traditional technical scheme, the combination of the steel pipe and the concrete pipe wall avoids the buckling problem of the steel pipe and the abrasion problem of an outer anticorrosive layer when the steel pipe is directly adopted for pipe jacking, the connectors can be conveniently aligned through the arrangement of the insertion part and the splicing part, the structure is simple, prefabrication is convenient, the construction period can be remarkably shortened, and the cost is reduced; and the pipeline bearing capacity and the pipeline durability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a steel pipe inner wall concrete pipe for water conservancy engineering. Background Art

[0002] At present, pipe jacking is used in water supply and drainage, water diversion and regulation pipelines of water conservancy projects. Pipe jacking is commonly used, including reinforced concrete pipe jacking, prestressed steel cylinder concrete pipe jacking, steel pipe and other pipes. There are usually some problems:

[0003] When the solution of reinforced concrete jacking pipe with steel pipe lining is adopted, after the installation of the steel pipe is completed, the gap between the reinforced concrete jacking pipe and the steel pipe needs to be filled with grouting, but it is difficult to fill it up and the investment in the project is large, and the construction process leads to a long construction period.

[0004] When using the prestressed steel tube concrete jacking solution, it is difficult to align the interface, and water leakage is prone to occur and is difficult to handle.

[0005] When the direct jacking solution is adopted, buckling is prone to occur during long-distance jacking; friction occurs between the steel pipe and the rock formation, and the external anti-corrosion of the steel pipe is often damaged by friction and cannot be repaired; the jacked steel pipe is buried deep underground all year round, and the steel pipe with damaged external anti-corrosion is prone to rust and has poor durability.

[0006] Taking into account the many existing difficulties, the existing water pipelines are difficult to meet the requirements by using jacking construction. Therefore, we propose a steel pipe with a concrete inner wall for water conservancy projects. Summary of the invention

[0007] The purpose of the present invention is to provide a steel pipe inner wall concrete pipe for water conservancy projects. The steel pipe inner wall concrete pipe is a new type of pipe suitable for long-distance jacking. The pipe is also suitable for open-cut buried pipe construction, so as to achieve the purpose of saving project investment and construction period, and has good durability and high bearing capacity.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] A water conservancy project steel pipe inner wall concrete pipe, comprising:

[0010] A steel pipe and a concrete pipe wall coaxially fixed to the outer side of the steel pipe;

[0011] The front end and the rear end of the concrete pipe wall are respectively provided with an insertion part and a splicing part, and the splicing part of the former concrete pipe wall is spliced ​​and fixedly connected with the insertion part of the latter concrete pipe wall;

[0012] The tail end of the first steel pipe is fixedly connected to the front end of the second steel pipe.

[0013] Optionally, a plurality of stiffening parts for increasing the rigidity of the steel pipe are fixedly connected to the outer wall of the steel pipe.

[0014] Optionally, the splicing portion includes a steel hoop ring arranged at the rear end of the concrete pipe wall, and the steel hoop ring is used to splice and fix with the insertion portion at the front end of another concrete pipe wall.

[0015] Optionally, the insertion portion includes a splicing groove opened at the front end of the concrete pipe wall, the outer diameter of the splicing groove matches the inner diameter of the steel hoop ring, and the steel hoop ring of the former concrete pipe wall is sleeved on the outer side of the splicing groove of the latter concrete pipe wall.

[0016] Optionally, a sealing portion is provided on the outer wall of the splicing groove, and the sealing portion is used for waterproofing the joint between the steel hoop ring and the splicing groove.

[0017] Optionally, a buffer portion is axially connected to the inner wall of the steel hoop ring, and the rear end of the buffer portion contacts the front end of the other concrete pipe wall, and the buffer portion is used to prevent the contact point of the concrete end from being partially damaged.

[0018] Optionally, the tail end of the first steel pipe and the front end of the second steel pipe are fixed by welding through an arc-starting ring plate.

[0019] Optionally, the outer side of the tail end of the steel pipe is axially connected to the arc-striking ring plate, and a groove is provided on the end face of the steel pipe close to one end of the arc-striking ring plate. After the front end of the rear steel pipe is inserted into the inner side of the arc-striking ring plate of the former steel pipe, a groove weld is formed between the front end of the rear steel pipe, the groove at the tail end of the former steel pipe and the inner wall of the arc-striking ring plate, and the groove weld is used for welding and fixing the former steel pipe and the rear steel pipe.

[0020] Optionally, a butt ring is embedded in the front end of the concrete pipe wall, one end of the arc-striking ring plate is embedded in the inner wall of the rear end of the concrete pipe wall, and the other end of the arc-striking ring plate extends into the concrete pipe wall. The butt ring at the front end of the rear concrete pipe wall is inserted into the arc-striking ring plate at the rear end of the former concrete pipe wall. The butt ring, the arc-striking ring plate and the rear end of the steel pipe are combined to form a groove weld, and the butt ring and the arc-striking ring plate are anchored to the concrete pipe wall by bolts.

[0021] Optionally, a channel is opened at the end of the concrete pipe wall. After two adjacent concrete pipe walls are spliced, the two channels are butt-jointed to form a bolt connection channel that passes through the ends of the two sections of the concrete pipe walls. The channel is used for bolts to pass through. Both ends of the bolts are fixed to the corresponding concrete pipe walls by nuts and gaskets respectively. The end of the concrete pipe wall is provided with a groove for leaving space for the bolt to be inserted and the nut to be tightened. The groove is filled with high-strength epoxy mortar. The end of the bolt is fixed with an anti-falling I-shaped protective frame for preventing the high-strength epoxy mortar from falling off.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] When in use, the concrete pipe with the inner wall of the steel pipe is prefabricated in the factory, and the concrete pipe wall is poured outside the steel pipe and prefabricated in advance. When splicing, the insertion part of the previous concrete pipe wall is spliced ​​and fixed with the splicing part of the next concrete pipe wall, and the jacking method or open excavation method can be used for construction. After the construction is completed, the steel pipes are welded and fixed. Compared with the traditional technical solution, the combination of steel pipe and concrete pipe wall avoids the buckling problem of the steel pipe and the wear problem of the outer anti-corrosion layer when the steel pipe is directly used for jacking. The setting of the insertion part and the splicing part facilitates the alignment of the interface. The present invention has a simple structure and is easy to prefabricate. It can significantly save construction time, reduce costs, improve the jacking bearing capacity and annular bearing capacity, and improve the durability of the water pipeline. 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 drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 It is a cross-sectional view of the structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure after two adjacent pipes are spliced ​​together according to the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the first fixing method of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the second fixing method of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the third fixing method of the present invention;

[0031] Among them, 1. Steel hoop; 2. Rubber pad; 3. Arc-starting ring plate; 4. Stiffening ribs; 5. Longitudinal steel bars; 6. Circumferential steel bars; 7. Grouting holes; 8. Steel pipe; 9. Concrete pipe wall; 10. Rubber water stop ring; 11. Bolts; 12. Groove weld; 13. Anti-fall I-beam protection frame; 14. Nuts; 15. Gaskets; 16. Bolts; 17. Docking ring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0033] The reinforced concrete jacking pipe described in this embodiment is a sewage pipe formed by mixing cement, steel bars, sand, gravel and other raw materials with a centrifuge. It is mainly used for drainage tasks such as urban rainwater, sewage or farmland irrigation and drainage. It is a construction method for laying underground pipelines without excavation, that is, digging two working wells at both ends, and then pushing the pipe from one end to the other in the well. However, it is not directly pushed into the soil, but a machine head is used to dig in the front first, and the pipe is pushed in while digging. The mud produced by the dark excavation is passed through a mud and water loop pipe connected to the machine head, while water is transported into the mud to turn it into muddy water, and the muddy water is pumped to the ground and transported away. After the pipeline is connected, the opening on the working well is narrowed, and the manhole cover is covered to become a future inspection well. The advantages are that it does not affect the surrounding environment or has a small impact, the construction site is small, and the noise is small. Moreover, it can work deep underground, which is an advantage that excavation and buried pipes cannot match. However, the jacking technology also has disadvantages, such as long construction time and high project cost.

[0034] Raw material requirements for this example:

[0035] 1. The cement grade requirement is not less than 425 Portland cement. Ordinary Portland cement or slag Portland cement should not be less than 425 Portland cement. The cement properties should comply with the requirements of GB-175, GB-199, GB-748 and GB-1344.

[0036] 2. The maximum particle size of gravel shall not be greater than 1 / 3 of the pipe wall thickness, and shall not be greater than 3 / 4 of the net distance of the annular reinforcement. Fine aggregate should be hard medium sand, and the fineness modulus M1 should be: 2.3~3.0.

[0037] 3. Concrete should be allowed to be added with admixtures and additives. When fly ash is added as an admixture, it should comply with the provisions of GB-1596 and GBJ-28. When adding admixtures, it should comply with the provisions of GB-8076 and GBJ-119. When adding other admixtures, it should comply with the provisions of other relevant standards.

[0038] 4. The water used for concrete mixing should comply with GBJ-63 standard.

[0039] 5. The steel bars should be general purpose low-carbon steel bars and should comply with the requirements of GB-343 or JC / T540.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Reference Figures 1 to 6 The present invention discloses a water conservancy engineering steel pipe inner wall concrete pipe, comprising:

[0042] A steel pipe 8 and a concrete pipe wall 9 coaxially fixed to the outer side of the steel pipe 8;

[0043] The front end and the rear end of the concrete pipe wall 9 are respectively provided with an insertion part and a splicing part, and the splicing part of the front concrete pipe wall 9 is spliced ​​and fixedly connected with the insertion part of the rear concrete pipe wall 9;

[0044] The rear end of the front steel pipe 8 is fixedly connected to the front end of the rear steel pipe 8 .

[0045] When in use, the concrete pipe with the inner wall of the steel pipe is prefabricated in the factory, and the concrete pipe wall 9 is fixed outside the steel pipe 8 and prefabricated in advance. When splicing, the insertion part of the previous concrete pipe wall 9 is spliced ​​and fixed with the splicing part of the next concrete pipe wall 9, and the construction can be carried out by jacking or open excavation. After the construction is completed, the steel pipes 8 can be fixed. Compared with the traditional technical solution, the combination of steel pipe 8 and concrete pipe wall 9 avoids the buckling problem of the steel pipe and the wear problem of the outer anti-corrosion layer when the steel pipe is directly used for jacking. The setting of the insertion part and the splicing part facilitates the alignment of the interface. The present invention has a simple structure and is easy to prefabricate, which can significantly save construction time, reduce costs, and improve durability.

[0046] The specific size of the steel pipe 8 is determined according to the jacking length and water delivery scale of the jacking project.

[0047] As an optional implementation, the inner wall of the steel pipe 8 is made of B-grade or C-grade rolled steel pipe with a wall thickness of 12-16 mm, a diameter of 1600-3500 mm, and a length of 2000-3000 mm.

[0048] As an optional implementation, a plurality of stiffening parts for increasing the rigidity of the steel pipe 8 are fixedly connected to the outer wall of the steel pipe 8 .

[0049] As an additional implementation, the stiffening portion includes a plurality of stiffening ribs 4 arranged in a matrix, the plurality of stiffening ribs 4 are evenly arranged on the outer wall of the steel pipe 8, the stiffening ribs 4 are of a trapezoidal structure, one end of the short side of the stiffening rib 4 is fixedly connected to the outer wall of the steel pipe 8, the stiffening rib 4 is buried in the concrete pipe wall 9, and the thickness of the stiffening rib 4 is not less than the wall thickness of the steel pipe 8;

[0050] As an increaseable implementation method, there are 18 stiffening ribs 4 in total, and the stiffening ribs 4 are fixed to the outer wall of the steel pipe 8 by welding. The thickness of the weld between the steel pipe 8 and the stiffening ribs 4 is not less than the thickness of the steel pipe 8.

[0051] As an optional implementation, a plurality of studs 11 are fixed to the outer wall of the steel pipe 8, and the plurality of studs 11 are arranged in a matrix, and the plurality of studs 11 are evenly distributed on the outer wall of the steel pipe 8;

[0052] As an optional implementation, the studs 11 are fixed to the outer wall of the steel pipe 8 by welding, and the distance between two adjacent studs 11 is no more than 500 mm.

[0053] The bolts 11 are made of steel bars, the diameter of the bolts is the same as the thickness of the steel pipe 8, and they are evenly welded on the steel pipe 8. The longitudinal and transverse spacings are both less than 500mm, which plays a role in strengthening the anchor connection between the inner wall of the steel pipe 8 and the concrete and the shear resistance, thereby improving the joint bearing capacity.

[0054] As an optional implementation, the concrete strength of the concrete pipe wall 9 is not less than C50 when used as a jacking pipe.

[0055] Longitudinal reinforcements 5 and annular reinforcements 6 are arranged in the concrete pipe wall 9, and the spacing and diameter of the reinforcements are determined by the design.

[0056] As an optional embodiment, the splicing portion includes a steel hoop ring 1 arranged at the rear end of the concrete pipe wall 9, and the steel hoop ring 1 is used to splice and fix with the insertion portion at the front end of another concrete pipe wall 9.

[0057] As an optional embodiment, the insertion part includes a splicing groove opened at the front end of the concrete pipe wall 9, the outer diameter of the splicing groove matches the inner diameter of the steel hoop ring 1, and the steel hoop ring 1 of the previous concrete pipe wall 9 is sleeved on the outside of the splicing groove of the next concrete pipe wall 9.

[0058] The steel hoop ring 1 is embedded in the rear end of the concrete pipe wall 9 and plays a bearing connection role after being spliced ​​with the splicing groove at the front end of another concrete pipe wall 9.

[0059] As an optional implementation, a sealing portion is provided on the outer wall of the splicing groove, and the sealing portion is used for waterproofing the joint between the steel hoop ring 1 and the splicing groove.

[0060] As an additional implementation, the sealing portion includes at least one rubber water-stop ring 10, and the rubber water-stop ring 10 is coaxially embedded in the outer wall of the splicing groove.

[0061] As an optional implementation, two rubber water-stop rings 10 are provided and embedded in the front outer side of the concrete pipe wall 9 to play a waterproof role.

[0062] The steel hoop ring 1 cooperates with two rubber water-stop rings 10 to play a waterproof role.

[0063] As an optional embodiment, a buffer portion is axially connected to the inner wall of the steel hoop ring 1, and the rear end of the buffer portion contacts the front end of another concrete pipe wall 9. The buffer portion is used to prevent the contact point of the concrete end from being partially damaged.

[0064] As an additional implementation, the buffer portion includes a rubber pad 2 , and the rubber pad 2 is coaxially fixed to the rear end of the concrete pipe wall 9 .

[0065] The rubber pad 2 acts as a buffer for the front end of the latter concrete pipe wall 9 during jacking, preventing the contact portion of the end of the concrete pipe wall 9 from being partially damaged.

[0066] As an additional implementation method, a plurality of grouting holes 7 are circumferentially opened in the middle of the steel pipe 8 , and the grouting holes 7 penetrate the concrete pipe wall 9 .

[0067] In this embodiment, three grouting holes 7 are provided, and all three grouting holes 7 penetrate the concrete pipe wall 9. During the jacking process, bentonite slurry is poured to reduce the friction resistance of the concrete pipe wall 9. After the jacking is completed, backfill grouting and consolidation grouting are performed through the grouting holes.

[0068] As an optional implementation, the tail end of the front steel pipe 8 and the front end of the rear steel pipe 8 are fixed by welding via an arc-starting ring plate 3 .

[0069] As an optional embodiment, the outer side of the tail end of the steel pipe 8 is axially connected to the arc-striking ring plate 3, and a groove is arranged on the end face of the steel pipe 8 close to one end of the arc-striking ring plate 3. After the front end of the rear steel pipe 8 is inserted into the inner side of the arc-striking ring plate 3 of the previous steel pipe 8, a groove weld 12 is formed between the front end of the rear steel pipe 8, the groove at the tail end of the previous steel pipe 8 and the inner wall of the arc-striking ring plate 3, and the groove weld 12 is used for welding and fixing the previous steel pipe 8 and the rear steel pipe 8.

[0070] The arc-striking ring plate 3 is welded to the tail end of the steel pipe 8, and serves as the arc-striking plate for the butt weld of the two steel pipes 8 after the two steel pipes 8 are butt-jointed end to end. A groove is provided on the end face of the steel pipe 8 that is in close contact with the arc-striking ring plate 3. The two steel pipes 8 are connected by a grooved single-sided V-shaped weld, which can ensure the weld quality of the butt weld connection of the steel pipes 8.

[0071] As an optional implementation method of the connection joint, a channel is opened at the end of the concrete pipe wall 9. After two adjacent concrete pipe walls 9 are spliced, the two channels are butt-jointed to form a bolt connection channel that passes through the ends of the two sections of the concrete pipe walls 9. The channel is used for the passage of bolts 16. The two ends of the bolts 16 are respectively fixed to the corresponding concrete pipe walls 9 by nuts 14 and gaskets 15. The ends of the concrete pipe walls 9 are provided with grooves for leaving space for the bolts 16 to be inserted and the nuts 14 to be tightened. The grooves are filled with high-strength epoxy mortar. The ends of the bolts 16 are fixed with anti-falling I-shaped protective frames 13 for preventing the high-strength epoxy mortar from falling off.

[0072] The butt joints between the ends of the two concrete pipe walls 9 are filled with high-strength epoxy mortar.

[0073] The bolt connection channel is an arc-shaped structure, and the diameter of the bolt 16 matches the channel.

[0074] Another rubber water stop ring 10 is embedded in the middle of the rubber pad 2 .

[0075] The arrangement of the arc-shaped bolt 16 facilitates penetration into and out of the inner side of the concrete pipe wall 9 .

[0076] As an optional implementation method of the connection joint, a butt ring 17 is embedded in the front end of the concrete pipe wall 9, one end of the arc-striking ring plate 3 is embedded in the inner wall of the rear end of the concrete pipe wall 9, and the other end of the arc-striking ring plate 3 extends into the concrete pipe wall 9. The butt ring 17 at the front end of the rear concrete pipe wall 9 is inserted into the arc-striking ring plate 3 at the rear end of the previous concrete pipe wall 9. The butt ring 17, the arc-striking ring plate 3 and the rear end of the steel pipe 8 are combined to form a groove weld 12, and the butt ring 17 and the arc-striking ring plate 3 are anchored to the concrete pipe wall 9 by bolts 11.

[0077] As an additional implementation mode, the present invention provides a method for producing a steel pipe inner wall concrete pipe for a water conservancy project, comprising the following steps:

[0078] Manufacture and install the steel pipe 8; install the splicing part at one end of the steel pipe 8; tie the steel cage on the outside of the steel pipe 8 and support the formwork; connect the insertion part to the end of the concrete pipe wall 9 away from the splicing part; pour the concrete pipe wall 9; concrete curing: temperature curing (15℃ / h), constant temperature (50℃) curing for 5 hours, cooling curing (15℃ / h) to outdoor temperature, curing in water for 7 days, and moisturizing curing for 7 days.

[0079] During production, the studs 11 and the stiffening ribs 4 are positioned and welded to the steel pipe 8, the longitudinal reinforcement 5 and the annular reinforcement 6 are sleeved on the outside of the steel pipe 8 according to the design requirements, the steel hoop 1 is welded to the steel pipe 8, and finally the formwork is supported and concrete is poured to form the concrete pipe wall 9.

[0080] The use of factory prefabrication production methods can not only reduce costs through mass production, but also shorten production time, improve manufacturing efficiency and improve the quality of pipeline products.

[0081] As an additional implementation method, the present invention provides a method for jacking and assembling a steel tube inner wall concrete pipe, comprising the following steps:

[0082] S101, excavation and support of jacking well and receiving well;

[0083] S102, back wall casting and maintenance;

[0084] S103, installation of guide rails, mud pipelines, power systems, and control systems;

[0085] S104, pipe jacking machine hoisting and installation;

[0086] S105, hoisting and jacking of concrete pipes on the inner wall of steel pipes, and simultaneous pouring of bentonite slurry to reduce drag;

[0087] S106, repeat step S105 until the pipeline length reaches the designed length;

[0088] S107, jacking out, receiving and hoisting of the pipe jacking machine in the receiving well;

[0089] S108, injecting water to replace bentonite slurry;

[0090] S109, calibration of concrete pipe inside steel pipe;

[0091] S110, the inner wall joint of the steel pipe 8 of the concrete pipe is welded and connected;

[0092] S111, backfill grouting of concrete pipe on the inner wall of steel pipe;

[0093] S112, consolidation grouting of concrete pipe on the inner wall of steel pipe;

[0094] S113, detection of hollowing out of concrete pipes on the inner wall of steel pipes and detection of joint welds;

[0095] S114, Anti-corrosion treatment of the welds of concrete pipe joints on the inner wall of steel pipes;

[0096] S115. Acceptance of steel pipe inner wall concrete pipe jacking project.

[0097] As an additional implementation mode, the present invention provides an open-cut buried pipe assembly method for a steel pipe inner wall concrete pipe, comprising the following steps:

[0098] S201, trench excavation and support;

[0099] S202, cushion construction;

[0100] S203, hoisting of concrete pipe on inner wall of steel pipe, welding connection of inner wall joint of steel pipe 8;

[0101] S204, repeat step S203 until the pipeline length reaches the designed length;

[0102] S205, steel pipe inner wall concrete pipe joint weld inspection;

[0103] S206, anti-corrosion treatment of the welds of concrete pipe joints on the inner wall of steel pipes;

[0104] S207, backfill and compact the inner wall of the steel pipe with concrete;

[0105] S208, road surface restoration construction;

[0106] S209. Acceptance of open-cut buried steel pipe with concrete lining.

[0107] Compared with the traditional technical scheme, the steel pipe inner wall concrete pipe combined with the jacking technology in the present invention has the effect of saving project investment and construction period, and has good durability and high bearing capacity. The advantages of the invention applied to the steel pipe inner wall concrete pipe and jacking assembly method of water conservancy projects are:

[0108] (1) Compared with prestressed steel tube concrete jacking pipe, the steel tube inner wall concrete pipe is simple to design and manufacture and easy to operate;

[0109] (2) Compared with prestressed steel tube concrete jacking pipe, the steel tube inner wall concrete pipe and its jacking assembly method save engineering investment;

[0110] (3) Compared with reinforced concrete jacking pipe + steel pipe lining, the steel pipe inner wall concrete pipe jacking construction process is less, saving construction time and project investment;

[0111] (4) Compared with reinforced concrete jacking pipe, the concrete pipe with inner wall of steel pipe has small roughness and fast water flow rate. The concrete pipe with inner wall of steel pipe also avoids the problem of water seepage from inside reinforced concrete jacking pipe and water seepage from outside;

[0112] (5) Compared with steel pipes, steel pipes with concrete inner walls have good durability and high compressive bearing capacity, avoiding the need to bury pipes on roads and then encapsulate them with concrete;

[0113] (6) It solves the high longitudinal bearing capacity requirement of the concrete pipe on the inner wall of the steel pipe under the condition of long-distance pipe jacking;

[0114] (7) The requirement for high tensile bearing capacity of the inner wall of the steel pipe under high water pressure water supply conditions is solved.

[0115] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0116] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A water conservancy project steel pipe with concrete inner wall, characterized in that: include: A steel pipe (8) and a concrete pipe wall (9) coaxially fixed to the outside of the steel pipe (8); The front end and the rear end of the concrete pipe wall (9) are respectively provided with an insertion portion and a splicing portion, and the splicing portion of the first concrete pipe wall (9) is spliced ​​and fixedly connected with the insertion portion of the second concrete pipe wall (9); The rear end of the first steel pipe (8) is fixedly connected to the front end of the second steel pipe (8); The splicing portion comprises a steel hoop ring (1) arranged at the rear end of the concrete pipe wall (9), and the steel hoop ring (1) is used to splice and fix with the insertion portion at the front end of another concrete pipe wall (9); The insertion portion comprises a splicing groove formed at the front end of the concrete pipe wall (9), the outer diameter of the splicing groove matches the inner diameter of the steel hoop ring (1), and the steel hoop ring (1) of the first concrete pipe wall (9) is sleeved on the outer side of the splicing groove of the second concrete pipe wall (9); The tail end of the first steel pipe (8) and the front end of the second steel pipe (8) are fixed by welding via an arc-starting ring plate (3).

2. A water conservancy engineering steel pipe with inner wall concrete according to claim 1, characterized in that: The outer wall of the steel pipe (8) is fixedly connected with a plurality of stiffening parts for increasing the rigidity of the steel pipe (8).

3. A water conservancy engineering steel pipe with inner wall concrete according to claim 1, characterized in that: The outer wall of the splicing groove is provided with a sealing portion, and the sealing portion is used to waterproof the joint after the steel hoop ring (1) and the splicing groove are spliced.

4. The water conservancy engineering steel pipe with inner wall concrete according to claim 1, characterized in that: The inner wall of the steel hoop ring (1) is axially connected to a buffer portion, the rear end of the buffer portion contacts the front end of the other concrete pipe wall (9), and the buffer portion is used to prevent the contact point of the concrete end from being partially damaged.

5. The water conservancy engineering steel pipe with inner wall concrete according to claim 1, characterized in that: The outer side of the tail end of the steel pipe (8) is axially connected to the arc-striking ring plate (3), and a groove is provided on the end surface of the steel pipe (8) close to one end of the arc-striking ring plate (3). After the front end of the rear steel pipe (8) is inserted into the inner side of the arc-striking ring plate (3) of the front steel pipe (8), a groove weld (12) is formed between the front end of the rear steel pipe (8), the groove of the tail end of the front steel pipe (8) and the inner wall of the arc-striking ring plate (3), and the groove weld (12) is used for welding and fixing the front steel pipe (8) and the rear steel pipe (8).

6. The water conservancy engineering steel pipe with concrete inner wall according to claim 1, characterized in that: A butt joint ring (17) is embedded in the front end of the concrete pipe wall (9), one end of the arc-striking ring plate (3) is embedded in the inner wall of the rear end of the concrete pipe wall (9), and the other end of the arc-striking ring plate (3) extends into the concrete pipe wall (9). The butt joint ring (17) at the front end of the latter concrete pipe wall (9) is inserted into the arc-striking ring plate (3) at the rear end of the former concrete pipe wall (9). The butt joint ring (17), the arc-striking ring plate (3) and the rear end of the steel pipe (8) are combined to form a groove weld (12). The butt joint ring (17) and the arc-striking ring plate (3) are anchored to the concrete pipe wall (9) by bolts (11).

7. The water conservancy engineering steel pipe with inner wall concrete according to claim 1, characterized in that: A hole is opened at the end of the concrete pipe wall (9). After two adjacent concrete pipe walls (9) are spliced, the two holes are butted together to form a bolt connection channel that passes through the ends of the two sections of the concrete pipe walls (9). The channel is used for the passage of a bolt (16). The two ends of the bolt (16) are respectively fixed to the corresponding concrete pipe wall (9) through a nut (14) and a gasket (15). The end of the concrete pipe wall (9) is provided with a slot for leaving a space for the bolt (16) to be inserted and the nut (14) to be tightened. The slot is filled with high-strength epoxy mortar. The end of the bolt (16) is fixed with an anti-falling I-shaped protective frame (13) for preventing the high-strength epoxy mortar from falling off.

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