CN105133646A - Underground steel and concrete structure pipeline and manufacturing method thereof - Google Patents

Abstract

The invention discloses an underground steel-concrete structure pipeline and a manufacturing method thereof. The pipeline includes a pipe body, and the surface of the pipe body extends inwardly to form a rib arranged spirally along the outer wall of the pipe body. The rib and the pipe body form a groove. A plugging steel strip is provided for blocking the notch of the groove, a hollow cavity is formed between the convex rib and the plugging steel strip, and concrete is filled in the hollow cavity to form a spiral concrete channel. The convex rib inside the pipe body of the present invention is integrally formed with the pipe wall, there is no weld between the two, and it can withstand dynamic load fatigue when subjected to dynamic load, which solves the problem of sharing pipeline projects underground, underground comprehensive pipe corridors and underground passageways The problem of using large-scale steel structure products in China. Simultaneously, the method of the invention is convenient to operate, simple to implement and easy to implement.

Description

Underground steel-concrete structure pipeline and manufacturing method thereof

technical field

The invention relates to a pipe and a manufacturing method thereof, in particular to an underground steel-concrete structure pipe with spiral ribs on the inner wall and a manufacturing method thereof.

Background technique

In recent years, with the rapid development of urban rail transit, communications and electric power, there are more and more demands for underground pipe trenches and passages. Most of the traditional underground shared pipelines are constructed by the method of open-cut foundation pit. After the foundation pit is excavated, concrete is poured, and internal pipelines are installed after meeting the requirements for use. Usually, the cross-section of the pipeline is rectangular or circular. Large-scale pipelines or passages are generally constructed by prefabricated assembly, manual construction, stone masonry or on-site cement pouring. Reinforced concrete structures have many joints, and there are problems of easy leakage and cracking. Moreover, reinforced concrete structures are very heavy, have high foundation requirements, long construction period, and high project cost. During construction, the upper structure of the pipeline must be completely Clearance, additional land acquisition and compensation costs are also quite high. There is also a structure that is a shield structure. The shield construction can even pass through the high-rise building area without disturbing the ground buildings without disturbing the upper structure of the pipeline. The shield method construction is to control the excavation surface and the surrounding soil from collapse and instability, while carrying out tunnel excavation, slag removal, assembling segments in the machine to form lining and grouting behind the wall, without disturbing the surrounding soil at all. In the shield structure, the segment lining is a concrete slab, which relies on its own strength and stiffness to resist the hoop stress of the pipeline. Therefore, in projects with deep buried ground, it is necessary to greatly increase the thickness of the concrete to improve the strength of the pipeline. , and the larger the diameter of the pipeline, the greater the project volume, the more complex the construction operation, the higher the technical standard, the greater the amount of steel and concrete used, and the greater the cost.

The applicant once applied for an invention patent with the application number 201410541898.3 and the title "An underground steel-concrete structure pipeline with a spiral composite reinforcement ring on the inner wall and its manufacturing method". And fill concrete in the reinforcement ring, the pipe body and the reinforcement ring can be made separately and then welded. The existing technology has the following defects: ①. The pipe body and the reinforcing ring are two separate parts, which are connected as a whole by welding. When the reinforcing ring is stressed, the weld seam is a stress concentration area and there is a hidden danger of cracking; ②. During the bending process, because the weld seam is outside the processing deformation zone, the weld seam is stretched, the deformation is large, and it is easy to crack; ③, if the pipe body is subject to dynamic load for a long time, such as subways, vehicles, etc. Fatigue and cracking; ④, in view of the semi-flexible structure of this type of pipe body, especially when the pipe body with large diameter is large, it relies heavily on the joint force effect of pipe and soil (that is, the joint deformation of the pipe body and the surrounding backfill soil), When the rigidity of the pipe itself is not enough, it is easy to produce large deformation.

Contents of the invention

Purpose of the invention: The first purpose of the present invention is to provide an underground steel-concrete composite structure pipeline with high strength, high pressure bearing capacity, and better adaptability to equipment dynamic loads.

The second object of the present invention is to provide a method for making the pipeline.

Technical solution: The pipe according to the present invention includes a pipe body. The surface of the pipe body extends inwardly to form a rib arranged spirally along the inner wall of the pipe body. The rib and the pipe body form a groove, and a The plugging steel strip at the notch of the groove, the hollow cavity is formed between the convex rib and the sealing steel strip, and then the hollow cavity is filled with concrete to form a spiral concrete channel.

Wherein, the cross section of the convex rib is Ω-shaped, groove-shaped, wave-shaped, parabolic-shaped, square or trapezoidal. The cross-section of the plugging steel strip is in-line, trough or mouth-shaped. At the same time, concrete overflow holes may be provided on the plugging steel belt, thereby forming a spiral concrete flow channel.

The pipe body of the present invention is formed by spiral winding together with a main steel strip having ribs on one side and a corresponding groove formed on the other side, and a plugging steel strip for sealing the notch of the groove.

At least one end of the plugging steel strip is welded to the notch of the groove of the pipe body, wherein one end of the plugging steel strip is welded, and the other free end is to retain the amount of deformation for subsequent bending.

In addition, the material of the pipe body, the main steel strip and the plugging steel strip in the present invention can be carbon steel, stainless steel or other materials; the cross section of the pipe body in the present invention can be circular or approximately rectangular.

Prestressed steel bars can be pierced into the hollow cavity to improve the strength of the pipe body.

The manufacturing method of the underground steel-concrete structure pipeline of the present invention comprises the following steps:

A. Prepare the main steel belt and the plugging steel belt;

B. The main steel strip has a first pair of sides and a second pair of sides, and the main steel strip is bent into a steel strip with ribs, and the ribs are arranged at intervals along the first pair of sides of the main steel strip, and the The opposite sides have the same length and form a groove with the main steel belt;

C, the plugging steel strip is attached to the notch of the main steel strip groove to form a composite steel strip, and at the same time, a hollow cavity is formed between the convex rib and the plugging steel strip;

D. The composite steel strip is spirally wound to form a pipe body with a spiral hollow cavity on the inner wall;

E. Put the pipe body in the soil pit, inject concrete into the hollow cavity at one end, fill the hollow cavity with concrete along the spiral direction, and complete the pouring.

Among them, preferably, in step C, concrete overflow holes can be set along the length direction of the plugging steel strip; in step E, prestressed steel bars can be placed in the hollow cavity at one end of the single-section pipe body according to the strength requirements, and from the other One end goes out, and the two ends of the prestressed steel bar are tightened and fixed, so that the prestressed steel bar is close to the inside of the hollow cavity, and pressure is applied to the prestressed steel bar. The resulting prestressed state is used to reduce or offset the external load. The stress caused by the pipe increases the strength and bearing capacity of the overall pipeline; the pipe body is expanded into a nearly rectangular cross-section by using a special mechanism, which improves the available space inside the pipe body; concrete is injected into the hollow cavity at one end of the pipe body, Concrete fills the hollow cavity along the spiral direction, and at the same time flows out from the concrete overflow hole to fill the gap between the pipe wall and the soil pit. When the concrete overflows from the concrete overflow hole at the other end of the pipe body, the pouring is completed.

Invention principle: The present invention simultaneously applies the principle of pipe-soil joint force, concrete steel pipe principle and prestressed reinforced concrete tension principle. The principle of pipe-soil joint force is that after the pipe is buried, the upper load of the pipe does not depend on the rigidity of the pipe Instead, it depends on the joint force of the pipe and the surrounding soil and rock, forming a joint force effect of the pipe and soil, and the vertical downward load will be converted into the ring inward pressure of the pipe wall. The working principle of the concrete steel pipe is to fill the hollow steel pipe with concrete, and use the superior pressure bearing capacity of the concrete and the surrounding effect of the steel pipe on the concrete to greatly enhance the vertical pressure bearing capacity of the steel pipe. The principle of prestressed reinforced concrete tension is to artificially apply pressure to the structural members before they are subjected to external loads, and the resulting prestressed state is used to reduce or offset the stress caused by external loads, that is, by means of concrete The higher compressive strength can make up for the lack of tensile strength, so as to delay the cracking of concrete in the tension area.

In the present invention, the three materials of ordinary carbon steel, concrete and prestressed steel bar are organically combined, and their respective characteristics and advantages are fully utilized, and they respectively assume different roles in the overall structure. A fully closed hollow cavity is formed on the inner side of the spiral welded steel pipe, which can increase the circumferential moment of inertia of the pipe wall, so that the wall thickness of the main steel pipe can be greatly thinner than that of ordinary steel pipes, reducing the cost of materials, and can manufacture large-diameter and super-large caliber steel pipe; when the steel strip of the main steel pipe is thin, during the rolling process, the delivery force will make the steel strip deflect, and the delivery and rolling can not be carried out, so the main steel strip is first formed into a structure with a raised section, and then used The sealing steel strip is welded to form a closed hollow cavity, the moment of inertia of the section of the steel strip is increased, and the delivery is easy to achieve when rolling, which is convenient for processing. After the pipe body is made, it can be processed from a circular shape to an approximately rectangular shape according to requirements, which increases the available space inside the pipe body and can still utilize the pipe-soil effect. When buried in the ground, prestressed steel bars are installed in the hollow reinforcement ring, and plain concrete or reinforced concrete is poured into the gap between the hollow reinforcement ring and the steel pipe and the pit, which greatly improves the radial and circumferential compression resistance of the steel pipe. The ability to further improve the overall strength of the pipe body, thereby further reducing the thickness of the main steel pipe steel strip, and further reducing the material cost, the setting of prestressed steel bars improves the static load and dynamic load on the top of the pipe. The ability to resist downward bending deformation can effectively control and reduce the deformation of the cross-sectional size of the pipe body.

Beneficial effects: Compared with the prior art, the significant advantages of the present invention are as follows: firstly, the ribs inside the pipe body are directly formed by integral processing of the pipe wall, there is no weld between the two, and it can withstand dynamic loads Fatigue under dynamic load; secondly, the rib can be directly used to bear the weight of the internal pipe frame and other structures of the pipe, and can also be used as a sleeper for the subway track, and the internal load can be evenly transmitted to the entire pipe body; at the same time, it is used to make the pipe The wall thickness of the main steel belt of the body can be greatly thinner than that of ordinary steel pipes, reducing the cost of materials; in addition, filling the hollow cavity with concrete can re-enhance the rigidity and bearing capacity of the steel pipe; after the pipe body is made, it can be , which is processed from a circle into an approximate rectangle, which improves the available space inside the pipe body, and can still take advantage of the pipe-soil effect; the setting of prestressed steel bars improves the ability of the static load and dynamic load on the top of the pipe to disturb the upper structure. The resistance ability effectively controls and reduces the deformation of the cross-sectional size of the pipe body; the pipe can solve the problem of using large-scale steel structure products in underground shared pipeline projects, underground comprehensive pipe galleries and underground passageways. At the same time, the method of the invention is convenient to operate, simple to implement and easy to implement.

Description of drawings

Fig. 1 is the cross-sectional schematic diagram of main strip of the present invention;

Fig. 2 is the structural representation of the main steel belt that surface has rib of the present invention;

Fig. 3 is the cross-sectional schematic view of the main steel strip with ribs on the surface of the present invention;

Fig. 4, Fig. 5 are the cross-sectional schematic diagrams of two welding modes of the main steel strip and the plugging steel strip of the present invention;

Fig. 6 is a partial enlarged view of place A in Fig. 4;

Fig. 7 is a partial enlarged view of place B in Fig. 5;

Fig. 8, Fig. 9 are the schematic diagrams of spiral coiling processing of composite steel strip of the present invention;

Fig. 10 is a cross-sectional schematic diagram of butt welding of pipe joints during the spiral coiling process of steel pipes of the present invention;

Fig. 11 is a partial enlarged view at C in Fig. 10;

Fig. 12 is a schematic diagram of the overall structure of a single-section steel pipe of the present invention;

Fig. 13 is a schematic diagram of the cross-sectional structure of the steel pipe of the present invention;

Figure 14 is a partial enlarged view at D in Figure 13;

Figure 15 is a partial enlarged view at E in Figure 13;

Fig. 16 is a schematic diagram of the transverse cross-sectional structure of the steel pipe in Fig. 13 after expansion;

Fig. 17 is a schematic diagram of a longitudinal cross-sectional structure of the present invention;

Fig. 18 is a partial enlarged view of F in Fig. 16 before filling with cement.

Fig. 19 is a partially enlarged view after filling cement at F in Fig. 16 .

Detailed ways:

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

The pipe of the present invention includes a pipe body 100, the surface of the pipe body 100 extends inwardly to form a spiral rib 102 along the inner wall of the pipe body 100, and the cross section of the rib 102 can be Ω-shaped, groove-shaped, wavy, or parabolic , square or trapezoidal, etc., the ribs 102 can be one row or multiple rows and spirally wound on the outer wall of the tube; The belt 200 seals the notch position of the groove 103; the cross section of the sealing steel belt 200 can be a straight shape, a groove shape or a square shape. At this time, a spiral hollow cavity 300 is formed between the convex rib 102 and the sealing steel strip 103, and the prestressed steel bar 600 can be penetrated from one end of the hollow cavity to the interior according to the strength requirements of the pipe body, and can be penetrated from the other end. Tighten and fix it so that the prestressed steel bar is close to the inside of the hollow cavity, so that the prestressed steel bar and the reinforcing ring surround the entire pipe body together. Concrete is filled into the above-mentioned hollow cavity 300, and the whole pipe body forms a spiral concrete channel.

The ribs of the pipeline of the present invention are integrated with the pipe wall, there is no weld between the two, and can withstand dynamic load fatigue when bearing dynamic loads; the circumferential section moment of inertia of the ribs is much higher than that of the general reinforcement method, not only Improve the bearing capacity, for example, it can be directly used to bear the weight of the internal pipe frame and other structures of the pipeline. At the same time, the wall thickness of the main steel belt can be greatly thinner than that of ordinary steel pipes, reducing the cost of materials; in addition, it can also greatly improve the main steel belt. The cross-sectional moment of inertia can achieve thin plate delivery when rolling, and achieve a breakthrough in the rolling process; it is worth mentioning that the rib can be equivalent to the sleeper of the subway track, and the internal load can be evenly transmitted to the entire pipe body; the concrete filled The ribs can also re-enhance the rigidity and bearing capacity of the steel pipe.

Preferably, the present invention can seal the concrete overflow hole 201 on the steel belt 200, the concrete can flow out from the hollow cavity 300, and the outflowing concrete can fill the gap between the pipe wall and the pit, so that the two become one overall.

The pipe body 100 of the present invention is spirally wound together by a main steel strip 101 having ribs 102 on one side and grooves 103 formed on the other side, and a plugging steel strip 200 for sealing the opening of the groove 103 . If the welding method is selected, welds are formed between adjacent pipe sections, and there are almost no other welds in the pipeline, so the overall strength is guaranteed.

When the plugging steel strip 200 is plugged, at least one end thereof is welded to the notch position of the groove 103 of the pipe body, wherein, if one end of the plugging steel strip is welded, the other free end is to retain the amount of deformation for subsequent bending; of course , The plugging steel strip can also be welded to the notch at both ends. The cross-section of the plugging steel strip 200 is in-line, groove-shaped or square-shaped. Preferably, when the cross-section is in-line, only one end of the sealing steel strip is welded to the notch of the groove 103 .

In addition, the material of the pipe body 100, the main steel strip 101 and the plugging steel strip 200 in the present invention is ordinary carbon steel or other materials.

The cross-section of the pipe body 100 is usually circular. Considering the internal space requirements when the pipe body is used as a municipal comprehensive pipe gallery, before the hollow cavity of the pipe body is filled with concrete, a special mechanism can be used to make the cross-sectional shape of the pipe body approximately square Or approximately rectangular shape, in which the four corners and four sides are all transitioned with arcs of specific curvature, so as to utilize the tube arch effect or the joint force effect of tube and soil.

Pipeline of the present invention can adopt following method to make:

A, prepare the main steel strip 101 and the plugging steel strip 200;

B, the main steel strip 101 has a first pair of sides 106 and a second pair of sides 107, the main steel strip 101 is bent into a steel strip with ribs 102, and the ribs 102 are along the first pair of sides of the main steel strip 101 106 are arranged at intervals, and are consistent with the length of the second pair of sides 107, and form grooves 103 with the main steel belt 101;

C. Attach the plugging steel strip 200 to the notch of the groove 103 of the main steel strip 101 to form a composite steel strip. At the same time, a hollow cavity 300 is formed between the ribs 102 and the plugging steel strip 200, Preferably, a concrete overflow hole 201 can be provided along the length direction of the plugging steel strip;

D. The composite steel strip is spirally wound to form a pipe body with a spiral hollow cavity on the inner wall;

E. Put the pipe body 100 in the soil pit, inject concrete 400 into the rib 102 at one end, fill the hollow cavity 300 with the concrete along the spiral direction, and complete the pouring. Preferably, the prestressed steel bar 600 is inserted into the hollow cavity 300 from one end of the single-section pipe body, and passed out from the other end, and the two ends of the pre-applied steel bar are tightened and fixed. Preferably, a special mechanism can be used to expand the pipe body into an approximately rectangular cross-section. Further, when the concrete overflow hole 201 is opened on the plugging steel belt 200, the concrete 400 is injected into the rib 102 at one end of the pipe body, and the concrete 400 fills the hollow cavity 300 along the spiral direction, and at the same time flows out from the concrete overflow hole 201 Fill the gap between the pipe wall and the pit, and complete the pouring when the concrete overflows from the concrete overflow hole 201 at the other end of the pipe body.

During the pipe jacking construction of the pipeline of the present invention, the small holes on the pipeline wall (specifically, the concrete overflow holes provided on the plugging steel strip) can make the filled concrete fill the gap between the hollow cavity of the pipeline and the rock-soil cavern wall, It makes the pipe body more stable, and is more conducive to the joint stress effect of pipe and soil.

The pipeline of the present invention can be used in municipal public utility corridors, subway tunnels, underground water collection pipes, water supply pipes or drainage pipes, seawater pipelines, and pipelines for conveying sand, gravel, dust or other special media. The underground pipeline can be buried very deep and reach more than 10 to 25 meters.

Example 1:

First, adjust the spiral tube forming machine to a suitable forming angle according to the diameter of the spiral welded steel pipe to be produced.

Next, as shown in Figure 1, the main steel belt 101 plate is subjected to rust removal and shot blasting treatment; (quantity, size are set according to the actual situation) convex rib 102, this convex rib can be Ω shape, also can be the section shape such as channel steel section shape, rectangle, trapezoid or parabola shape, and both sides are processed out welding profile again Mouth 104; Lay a certain amount of plugging steel strips 200 at the notches of the grooves 103 corresponding to the convex ribs 102 after the main steel strips 101 are formed, and weld the two (also can only weld one side under special circumstances, and the other One side is not welded, so that when the steel pipe is used in the subsidence area, axial deformation is allowed), and a closed or nearly closed hollow cavity 300 is formed between the convex rib (102) and the plugging steel strip (200). At the same time, the plugging Concrete overflow hole 201 can be offered on the steel belt, as shown in Figure 4-7; Spiral coiling processing, as shown in Figure 8-9; while spiral coiling, the spiral weld 105 between pipe joints is welded, for example, submerged arc welding can be used, as shown in Figure 10-11 ; When the steel pipe is spirally coiled and welded to the required length, the steel pipe is cut off, as shown in Figure 12.

Next, the prestressed steel bar 600 is inserted into the hollow cavity 300 and passed out from the other end, and the two ends of the pre-applied steel bar are tightened and fixed, as shown in Fig. 13 , Fig. 14 and Fig. 18 . Then use a special mechanism to expand the pipe body into a shape of approximately rectangular cross-section to increase the internal space of the pipe body, as shown in Figure 16. Install the steel pipe in place, correct the position, and connect adjacent pipe joints or structures; pour plain concrete or reinforced concrete into the pouring hole 301 opened by the rib 102 at one end of the steel pipe, and the concrete flows along the spiral hollow cavity 300 , and flow out from the concrete overflow hole 201 on the plugging steel belt 200, when the concrete flows out from the concrete overflow hole at the other end of the pipe body, it means that the hollow cavity of the entire pipe body and the gap between the pipe wall and the surrounding soil pit are filled with concrete , as shown in Figure 15, Figure 17, and Figure 19, thus completing the making and construction of the underground pipeline.

Claims (10)

1. An underground steel-concrete structure pipeline, characterized in that: comprise a pipe body (100), the surface of the pipe body (100) extends inwardly to form a rib (102) that is spirally arranged along the inner wall of the pipe, and the rib (102) ( 102) form a groove (103) with the pipe body (100), and be provided with a plugging steel strip (200) for blocking the notch of the groove (103), and the ribs (102) and the plugging steel strip A hollow cavity (300) is formed between (200), and concrete (400) is filled in the hollow cavity (300) to form a spiral concrete channel. 2. The underground steel-concrete structure pipeline according to claim 1, characterized in that: the section of the rib (102) is Ω-shaped, groove-shaped, wave-shaped, parabolic, square or trapezoidal, and the sealing steel strip The cross section of (200) is straight, grooved or mouth-shaped. 3. The underground steel-concrete structure pipeline according to any one of claims 1-3, characterized in that: the plugging steel belt (200) is provided with a concrete overflow hole (201). 4. The underground steel-concrete structure pipeline according to claim 1, characterized in that: the pipe body (100) is composed of a main steel belt (101) with ribs (102) on one side and grooves (103) on the other side , and the sealing steel strip (200) used to seal the notch of the groove (103) is spirally wound together. 5. The underground steel-concrete structure pipeline according to claim 1, characterized in that at least one end of the plugging steel strip (200) is welded to the notch of the groove (103) of the pipe body. 6. The underground steel-concrete structure pipeline according to claim 1, characterized in that: the pipe body (100), the main steel strip (101) and the plugging steel strip (200) are made of carbon steel or stainless steel; The cross section of the pipe body (100) is circular or approximately rectangular. 7. The underground steel-concrete structure pipeline according to claim 1, characterized in that: the hollow cavity (300) is provided with prestressed steel bars (600). 8. The manufacturing method of the underground steel-concrete structure pipeline according to claim 1, characterized in that it comprises the steps of: A, prepare the main steel strip (101) and the plugging steel strip (200); B, the main steel strip (101) has a first pair of sides (106) and a second pair of sides (107), the main steel strip (101) is bent into a steel strip with ribs (102), and the ribs ( 102) arranged at intervals along the first pair of sides (106) of the main steel strip (101), consistent with the length of the second pair of sides (107), and forming grooves (103) with the main steel strip (101); C. Attach the plugging steel strip (200) to the notch of the main steel strip groove (103) to form a composite steel strip. At the same time, the A hollow cavity (300) is formed between them; D. The composite steel strip is spirally wound to form a pipe body (100) with a spiral hollow cavity (300) on the inner wall; E. Put the pipe body (100) in the soil pit, inject concrete into the convex rib (102) at one end, fill the hollow cavity (300) with concrete along the spiral direction, and complete the pouring. 9. The manufacturing method of the underground steel-concrete structure pipeline according to claim 8, characterized in that: in step E, the prestressed reinforcement (600) is installed in the hollow cavity (300), and the two ends of the prestressed reinforcement are Tighten and fix it; expand the pipe body (100) into a pipe body with a cross-section approximately rectangular; place the pipe body (100) in the soil pit, and inject concrete into the rib (102) at one end, and the concrete will follow the spiral direction The hollow cavity (300) is filled to complete pouring. 10. The manufacturing method of underground steel-concrete structure pipeline according to claim 8, is characterized in that: in step C, offer concrete overflow hole (201) along the length direction of plugging steel strip (200); Concrete is poured into the convex rib (102) at one end of the body (100), and the concrete fills the hollow cavity (300) along the helical direction, and at the same time flows out from the concrete overflow hole (201) to fill the gap between the pipe wall and the pit. When overflowing from the concrete overflow hole (201) at the other end of the pipe body, pouring is completed.