Pipe roofing pre-building structure

Abstract

The utility model provides a pipe-roofing pre-building structure. The pipe-roofing pre-building structure comprises an inner ring plate, an outer ring plate and a plurality of supporting pipes, wherein the inner ring plate and the outer ring plate extend along the long axis of a tunnel; the outer ring plate is arranged on the periphery of the inner ring plate in a sleeving mode and extends along the long axis of the tunnel, the inner ring plate and the outer ring plate are spaced to form a closed space, and the closed space is filled with reinforced concrete; the multiple supporting pipes are arranged on the outer circumferential face of the outer ring plate in the circumferential direction of the outer ring plate at intervals, the supporting pipes extend along the long axis of the tunnel, and the cross sections of the supporting pipes are in an arc shape facing the opening of the outer ring plate. According to the pipe roofing pre-building structure, the inner ring plate and the outer ring plate are arranged to form a uniform and stable closed space, the closed space is regular in shape and free of section change positions, the overall structural strength is high, and the closed space is filled with the reinforced concrete, so that the overall bearing strength is improved; due to the arrangement mode of the inner ring plate and the outer ring plate, the number of sudden change positions of the whole section is reduced, and the stress concentration positions are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel engineering, and in particular relates to a prefabricated pipe curtain structure. Background Art

[0002] With the continuous advancement of urbanization, the number of large-span shallow-buried tunnels is increasing. Among them, there are more and more cases of tunnels passing under railways, roads, subway stations and other structures, and the requirements for tunnel construction settlement are getting higher and higher. The pipe-curtain structure method tunnel is first constructed along the tunnel contour and the reinforced concrete structure is poured inside the steel pipe connected into a ring. The construction of the tunnel support structure is completed before the tunnel is excavated, and the soil within the tunnel is excavated under the protection of the support structure. Therefore, it can better solve the tunnel construction problems such as large span, dark excavation, and small construction settlement.

[0003] However, the prefabricated pipe-roof structure used in existing projects is composed of multiple steel pipes. There is a serious stress concentration phenomenon at the cross-sectional change of the pipe-roof, which greatly reduces the bearing capacity of the prefabricated pipe-roof structure and also causes a waste of materials. Utility Model Content

[0004] The embodiment of the utility model provides a prefabricated tube-roof structure, aiming to solve the technical problem in the prior art that stress concentration exists at the cross-section change position of the tube-roof structure, which affects the structural strength and manufacturing cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Provided is a pipe-roof prefabricated structure, comprising:

[0007] an inner ring plate extending along the long axis of the tunnel;

[0008] an outer ring plate, which is sleeved on the outer circumference of the inner ring plate and extends along the long axis of the tunnel, wherein the inner ring plate and the outer ring plate are spaced to form a closed space, and the closed space is filled with reinforced concrete; and

[0009] A plurality of support tubes are arranged at intervals on the outer peripheral surface of the outer ring plate along the circumferential direction of the outer ring plate, the support tubes extend along the long axis of the tunnel, and the cross section of the support tubes is in an arc shape opening toward the outer ring plate.

[0010] In a possible implementation, the inner ring plate includes a first flat plate and a first connecting plate that are alternately connected in a closed loop, and the outer ring plate includes a second flat plate and a second connecting plate that are alternately connected in a closed loop; in the inward and outward directions, the first flat plate and the second flat plate correspond one-to-one, the first connecting plate and the second connecting plate correspond one-to-one, the support tube and the second flat plate correspond one-to-one, and the support tube is connected to the outer side surface of the corresponding second flat plate.

[0011] In a possible implementation manner, a first inserting nail is disposed on the second plate, and a long axis of the first inserting nail is perpendicular to a long axis of the tunnel and extends into the closed space.

[0012] In a possible implementation manner, a plurality of the first inserting pins are distributed on the surface of the second flat plate in a plum blossom shape.

[0013] In a possible implementation manner, a second inserting nail is provided on the first plate corresponding to the first inserting nail, and a long axis of the second inserting nail is perpendicular to a long axis of the tunnel and extends into the closed space.

[0014] In a possible implementation manner, a support column is connected between the first connecting plate and the corresponding second connecting plate.

[0015] In a possible implementation manner, a filling cavity formed by the support tube and the second flat plate is filled with a carrying medium.

[0016] In a possible implementation manner, a plate surface of the first flat plate is parallel to a plate surface of the corresponding second flat plate, and a plate surface of the first connecting plate is parallel to a plate surface of the corresponding second connecting plate.

[0017] In a possible implementation, a mounting hole is formed on a surface of the second flat plate facing the first flat plate, and the first inserting pin is plugged into and matched with the mounting hole.

[0018] In a possible implementation manner, the bolt cap of the first pin is located in the closed space, and the nail head of the first pin is inserted into the second flat plate.

[0019] Compared with the prior art, the prefabricated pipe curtain structure provided by the utility model has an inner ring plate and an outer ring plate to form a uniform and stable closed space. The closed space has a regular shape, there is no cross-sectional change, the overall structural strength is high, and the closed space is filled with reinforced concrete to improve the overall compressive strength; the arrangement of the inner ring plate and the outer ring plate replaces the traditional method of welding two adjacent support pipes through steel plates, reduces the number of overall cross-sectional mutations, reduces the locations of stress concentration, the support pipe only plays a supporting role, will not cause stress concentration, and improves the overall structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A main structural cross-sectional view of the prefabricated tube-roof structure provided by an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A partial enlarged view of the inner ring plate and the outer ring plate;

[0023] Figure 3 for Figure 1 A top view of the assembly of the first inserting pin and the second plate used in the embodiment;

[0024] Figure 4 It is a schematic diagram of the connection of steel pipes in the prior art.

[0025] Description of reference numerals:

[0026] 1. Support pipe;

[0027] 2. Inner ring plate; 21. First flat plate; 22. First connecting plate; 23. Driving space

[0028] 3. Outer ring plate; 31. Second flat plate; 32. Second connecting plate;

[0029] 4. Support column;

[0030] 5. First nail insertion;

[0031] 6. Second nail;

[0032] 7. Closed space;

[0033] 8', steel pipe. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as a limitation on the utility model.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0038] Please also read Figures 1 to 4 The pipe curtain prefabricated structure provided by the utility model is now described. The pipe curtain prefabricated structure includes an inner ring plate 2, an outer ring plate 3 and a plurality of support tubes 1 extending along the long axis of the tunnel; the outer ring plate 3 is sleeved on the outer circumference of the inner ring plate 2 and extends along the long axis of the tunnel, and the inner ring plate 2 and the outer ring plate 3 are spaced to form a closed space 7, and the closed space 7 is filled with reinforced concrete; a plurality of support tubes 1 are spaced along the circumference of the outer ring plate 3 on the outer circumferential surface of the outer ring plate 3, and the support tubes 1 extend along the long axis of the tunnel, and the cross section of the support tubes 1 is an arc shape opening toward the outer ring plate 3.

[0039] It should be noted that the support tube 1 needs to be cut. During the construction of the prefabricated structure of the pipe curtain, a plurality of support tubes are first arranged along the circumference of the tunnel, and parts of the support tubes are cut so that the remaining parts form the required support tubes 1, which are convenient for connection with the outer ring plate 3.

[0040] It should be noted that reinforced concrete refers to a composite material formed by adding steel mesh, steel plate or fiber to reinforced concrete to work together to improve the mechanical properties of reinforced concrete.

[0041] It should be noted that, see Figure 4 After the steel pipe 8' in the prior art is assembled into a ring structure, it is cut into two upper and lower steel pipe sections, namely the first steel pipe section and the second steel pipe section. A connecting steel plate is arranged between two adjacent steel pipes 8', and the two ends of the connecting steel plate are respectively connected to the first steel pipe section and the second steel pipe section, so that the structure formed is as follows: Figure 4 As shown in the figure, the place where the steel plate and the steel pipe section are connected is where the cross-section changes, and stress concentration is likely to occur at the cross-section change point.

[0042] It should be noted that the central axes of the inner ring plate 2 and the outer ring plate 3 overlap to make the formed skeleton uniform.

[0043] It should be noted that Figure 1 The dashed line frame in the figure refers to the first flat plate 21 and the second flat plate 31 , and the dashed line frame refers to the first connecting plate 22 and the second connecting plate 32 .

[0044] It should be noted that, since the internal support tube portion is discarded in the present application, the spacing distance between the inner ring plate 2 and the outer ring plate 3 can be increased, which can increase the radial thickness of the enclosed space 7, increase the filling volume of the reinforced concrete, and indirectly improve the structural strength.

[0045] Compared with the prior art, the prefabricated pipe curtain structure provided in the present embodiment is provided with an inner ring plate 2 and an outer ring plate 3 to form a uniform and stable closed space 7. The closed space 7 has a regular shape and no cross-sectional changes. The overall structural strength is high. The closed space 7 is filled with reinforced concrete to improve the overall compressive strength. The arrangement of the inner ring plate 2 and the outer ring plate 3 replaces the traditional method of welding two adjacent support pipes through steel plates, thereby reducing the number of overall cross-sectional mutations and the locations of stress concentration. The support pipe 1 only plays a supporting role and will not cause stress concentration, thereby improving the overall structural strength.

[0046] In some embodiments, see Figure 2 , the inner ring plate 2 includes a first flat plate 21 and a first connecting plate 22 that are alternately connected in a closed loop, and the outer ring plate 3 includes a second flat plate 31 and a second connecting plate 32 that are alternately connected in a closed loop; in the inner and outer directions, the first flat plate 21 and the second flat plate 31 correspond one-to-one, the first connecting plate 22 and the second connecting plate 32 correspond one-to-one, the support tube 1 corresponds one-to-one with the second flat plate 31, and the support tube 1 is connected to the outer side of the corresponding second flat plate 31. The second flat plate 31 is connected to the support tube 1 to ensure the connection strength between the support tube 1 and the outer ring plate 3. The second connecting plate 32 can connect two adjacent second flat plates 31, so that multiple support tubes 1 can be connected into one body, ensuring the stability of the skeleton. The first connecting plate 22 can connect two adjacent first flat plates 21, so that the inner ring plate 2 is formed, and corresponds to the outer ring plate 3, which increases the stability of the closed space 7.

[0047] The first flat plate 21 and the second flat plate 31 correspond one to one, and the first connecting plate 22 and the second connecting plate 32 correspond one to one, so that each part of the formed closed space 7 is uniform, and each position of the poured reinforced concrete is the same in the thickness direction, thereby ensuring the structural strength.

[0048] In specific implementation, the support tube is cut into support tubes 1 and connected with the second flat plate 31. The second flat plate 31 is made of a steel plate and is a rectangular plate structure. The long axis of the second flat plate 31 is parallel to the long axis of the support tube 1, and the length of the second flat plate 31 is equal to the length of the support tube 1. The two sides of the second flat plate 31 in the width direction are respectively connected to the two ends of the support tube 1.

[0049] In a specific implementation, the thickness of the second flat plate 31 is 18-22 mm, preferably 20 mm.

[0050] In specific implementation, the second connecting plate 32 is a square plate, the length of the second connecting plate 32 is equal to the length of the second flat plate 31, the second connecting plate 32 is arranged between two adjacent second flat plates 31, and the second connecting plate 32 is connected to the two second flat plates 31 on both sides along its own width direction, so as to prevent reinforced concrete from flowing out of the gap between the second connecting plate 32 and the second flat plate 31, thereby improving the sealing effect of the closed space 7.

[0051] In a specific implementation, the thickness of the second connecting plate 32 is selected to be 18-22 mm. Preferably, the thickness of the second connecting plate 32 is 20 mm.

[0052] In some embodiments, see Figure 2 The second flat plate 31 is provided with a first pin 5, the long axis of the first pin 5 is perpendicular to the long axis of the tunnel and extends into the closed space 7. The first pin 5 can extend into the closed space 7 and into the reinforced concrete. After the reinforced concrete solidifies, the reinforced concrete and the first pin 5 are formed as one piece. The position of the first pin 5 is fixed, so that the structural stability of the reinforced concrete is increased, and the reinforced concrete will not be displaced in the closed space 7, thereby increasing the relative stability between the reinforced concrete and the structure. The first pin 5 is inserted into the reinforced concrete, which can reduce the relative slip between the second flat plate 31 and the reinforced concrete and improve the ability of the second flat plate 31 and the reinforced concrete to work together.

[0053] In a specific implementation, the first inserting nail 5 is a bolt.

[0054] In some embodiments, see Figure 3 The plurality of first inserting pins 5 are distributed in a plum blossom shape on the plate surface of the second plate 31. The plum blossom-shaped distribution structure has high strength, can play the role of tensioning, can increase the integrity of the plurality of first inserting pins 5, can improve the integrity of the overall skeleton, and improve the positioning effect of reinforced concrete.

[0055] In a specific implementation, the plurality of first pins 5 may also be arranged in a rectangular shape.

[0056] In some embodiments, see Figure 2A second pin 6 is provided on the first plate 21 corresponding to the first pin 5, and the long axis of the second pin 6 is perpendicular to the long axis of the tunnel and extends into the closed space 7. The second pin 6 can further improve the interference effect on the reinforced concrete, prevent the relative slip between the reinforced concrete and the first plate 21, and improve the ability of the first plate 21 and the reinforced concrete to work together.

[0057] In some embodiments, see Figure 2 , a support column 4 is connected between the first connecting plate 22 and the corresponding second connecting plate 32. The support column 4 can support the first connecting plate 22 and the corresponding second connecting plate 32. When the prefabricated structure of the pipe curtain is subjected to pressure, the support column 4 can prevent the distance between the first connecting plate 22 and the corresponding second connecting plate 32 from changing, thereby ensuring the structural strength and stability of the closed space 7. The support column 4 can improve the bearing capacity of the structure. A support column 4 is provided between each pair of the first connecting plate 22 and the second connecting plate 32, which can serve as the main support member of the closed space 7, supporting the distance between the first connecting plate 22 and the corresponding second connecting plate 32, thereby allowing all the support columns 4 to bear the load together, reducing stress concentration.

[0058] In specific implementation, the support column 4 and the first connecting plate 22, and the support column 4 and the second connecting plate 32 are welded, and chamfers are set at the connection positions to ensure that the first connecting plate 22 and the second connecting plate 32 are respectively perpendicular to the support column 4. In actual use, multiple support columns 4 are set between the first connecting plate 22 and the corresponding second connecting plate 32 to improve the supporting effect. Optionally, the support column 4 is made of reinforced steel bars with high structural strength and can be used as a support member, or a metal bar can be used.

[0059] In some embodiments, see Figure 2 The filling cavity formed by the support tube 1 and the second flat plate 31 is filled with a bearing medium. The support tube 1 plays a supporting role to ensure the structural strength, but basically does not play a bearing role. The bearing medium can increase the supporting strength of the support tube 1.

[0060] Optionally, the bearing medium is mortar, which can completely fill the filling cavity and has a certain strength after solidification, and can play a supporting role with the support pipe 1. The bearing medium can also be cement aggregate reinforced concrete, as long as it can reduce the cost and meet the required strength, and will not be listed here one by one.

[0061] In some embodiments, the surface of the first flat plate 21 is parallel to the surface of the corresponding second flat plate 31, and the surface of the first connecting plate 22 is parallel to the surface of the corresponding second connecting plate 32. This can improve the uniformity of each part of the closed space 7, avoid stress concentration, and improve the overall structural strength.

[0062] In some embodiments, see Figure 1 The inner ring of the inner ring plate 2 forms a driving space 23. The driving space 23 is used for the passage of personnel and vehicles to lay the prefabricated structure of the pipe curtain along the tunnel direction.

[0063] It should be noted that the pipe curtain structure in the prior art retains the second steel pipe section inside, which is prone to stress concentration when bearing loads. In this embodiment, the boundary of the closed space 7 is composed of the first flat plate 21 and the first connecting plate 22, which has high connection strength, changes the original cross-sectional shape, reduces stress concentration, and increases the overall bearing strength.

[0064] In some embodiments, a mounting hole is formed on the surface of the second plate 31 facing the first plate 21, and the first inserting pin 5 is plugged into the mounting hole. The mounting hole and the first inserting pin 5 are plugged into each other to position the first inserting pin 5 and reduce the difficulty of installing the first inserting pin 5.

[0065] In some embodiments, see Figure 2 The bolt cap of the first pin 5 is located in the closed space 7 , and the nail head of the pin 5 is inserted into the second flat plate 31 .

[0066] In specific implementation, holes can be punched on the second plate 31, the holes are distributed in a plum blossom shape, and the hole depth is 10 mm. The nail head of the first nail 5 is inserted into the corresponding hole and welded to achieve the first nail 5 and the second plate 31 are fixedly connected together. After welding, the connection strength is high, the first nail 5 will not be separated from the second plate 31, and the overall structural stability is improved. The first nail 5 can normally resist the relative sliding of the reinforced concrete and maintain the stability of the shrub prefabricated structure. The bolt cap of the first nail 5 is located in the closed space 7, so that the nail head is inserted into the second plate 31, and no potential safety risks will be generated during the installation process.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated pipe-roof structure, characterized in that: include: an inner ring plate extending along the long axis of the tunnel; an outer ring plate, which is sleeved on the outer circumference of the inner ring plate and extends along the long axis of the tunnel, wherein the inner ring plate and the outer ring plate are spaced to form a closed space, and the closed space is filled with reinforced concrete; and A plurality of support tubes are arranged at intervals on the outer peripheral surface of the outer ring plate along the circumferential direction of the outer ring plate, the support tubes extend along the long axis of the tunnel, and the cross section of the support tubes is in an arc shape opening toward the outer ring plate.

2. The prefabricated pipe-roof structure according to claim 1, characterized in that: The inner ring plate includes a first flat plate and a first connecting plate that are alternately connected in a closed loop, and the outer ring plate includes a second flat plate and a second connecting plate that are alternately connected in a closed loop; in the inward and outward directions, the first flat plate and the second flat plate correspond one-to-one, the first connecting plate and the second connecting plate correspond one-to-one, the support tube and the second flat plate correspond one-to-one, and the support tube is connected to the outer side surface of the corresponding second flat plate.

3. The prefabricated pipe-roof structure according to claim 2, characterized in that: The second plate is provided with a first inserting nail, the long axis of the first inserting nail is perpendicular to the long axis of the tunnel and extends into the closed space.

4. The prefabricated pipe-roof structure according to claim 3, characterized in that: The plurality of first inserting pins are distributed on the surface of the second flat plate in a plum blossom shape.

5. The prefabricated pipe-roof structure according to claim 3, characterized in that: A second inserting nail is provided on the first plate corresponding to the first inserting nail, and the long axis of the second inserting nail is perpendicular to the long axis of the tunnel and extends into the closed space.

6. The prefabricated pipe-roof structure according to claim 5, characterized in that: A support column is connected between the first connecting plate and the corresponding second connecting plate.

7. The prefabricated pipe-roof structure according to claim 2, characterized in that: The filling cavity formed by the support tube and the second flat plate is filled with a bearing medium.

8. The prefabricated pipe-roof structure according to claim 2, characterized in that: The surface of the first flat plate is parallel to the surface of the corresponding second flat plate, and the surface of the first connecting plate is parallel to the surface of the corresponding second connecting plate.

9. The prefabricated pipe-roof structure according to claim 3, characterized in that: A mounting hole is formed on the plate surface of the second plate facing the first plate, and the first inserting pin is plugged and matched with the mounting hole.

10. The prefabricated pipe-roof structure according to claim 3, characterized in that: The bolt cap of the first plugging nail is located in the closed space, and the nail head of the first plugging nail is inserted into the second flat plate.

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