A tunnel support based on a steel pipe concrete structure and a construction method thereof

Abstract

The application discloses a tunnel support based on a steel pipe concrete structure and a construction method thereof, and belongs to the field of tunnel engineering. The tunnel support structure comprises pipe curtain units which are arranged along the contour of the tunnel in a ring shape at intervals, and two adjacent pipe curtain units are connected through a connecting assembly to realize the connection of the internal space of the pipe curtain units. A reinforcing assembly is arranged in the pipe curtain units to improve the structural strength of the pipe curtain units. Concrete is poured into the internal space of the pipe curtain units to form a steel pipe concrete combined structure to serve as a support system of the tunnel. Further, the application provides a construction method of the tunnel support. The pipe curtain units are driven into preset positions, installation grooves are formed on the two sides of the pipe curtain units, the connecting assembly is installed, the internal space of the adjacent pipe curtain units is connected, a steel structure reinforcing piece is welded in the pipe curtain units, and concrete is poured to form a steel-concrete combined structure. The construction method has high construction efficiency, low cost and great popularization value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tunnel engineering, and particularly relates to a tunnel support based on a steel pipe concrete structure and a construction method thereof. BACKGROUND

[0002] With the continuous advancement of urbanization in China, large-span shallow-buried tunnels are increasing, among which more and more cases of passing under railways, roads, subway stations and other buildings are increasing, and the requirements for tunnel construction settlement are increasing. The pipe curtain structure method for such complex condition tunnels has also increasingly entered engineering practice.

[0003] The traditional pipe curtain structure method is to first use a small shield machine or a pipe jacking machine to arrange a pipe curtain along the tunnel contour, and then cut each adjacent steel pipe in the pipe curtain and excavate the soil between the pipes. The adjacent pipe curtains are connected by steel plates, and then the steel bars are riveted in the annular through space, and the concrete is poured to form an inner and outer arc-shaped steel plate, and a combined structure of connecting steel bars and reinforced concrete.

[0004] The above existing pipe curtain structure method has the problems of multiple steel bar joints in the pipe curtain structure, difficulty in transporting curved steel bars into the pipe curtain structure for construction in the curved section, complex steel bar binding process, and difficulty in ensuring the quality of the joints. In the traditional pipe curtain structure, the bearing capacity of the soil is realized by relying on reinforced concrete, and the wave-shaped shell formed after the pipe curtain unit is cut open only serves as support during construction, resulting in waste of steel. SUMMARY

[0005] In view of one or more of the above defects or improvement needs of the prior art, the present application provides a tunnel support based on a steel pipe concrete structure and a construction method thereof, wherein the pipe curtain units are arranged along the tunnel contour and spaced apart in the annular direction, and the two adjacent pipe curtain units are connected by a connecting assembly to realize the connection of the internal spaces of the pipe curtain units. The reinforcing assembly is arranged in the pipe curtain unit to improve the structural strength of the pipe curtain unit. The steel pipe concrete combined structure is formed by pouring concrete in the internal space of the pipe curtain unit to serve as the support system of the tunnel.

[0006] To achieve the above purpose, the present application provides a tunnel support based on a steel pipe concrete structure and a construction method thereof, which comprises a plurality of pipe curtain units arranged along the tunnel contour and spaced apart in the annular direction, and a connecting assembly for connecting two adjacent pipe curtain units, characterized in that,

[0007] The two adjacent pipe curtain units are connected by the connecting assembly, and the internal spaces of the two adjacent pipe curtain units are connected by the connecting assembly;

[0008] The pipe curtain unit is internally provided with a reinforcing assembly, which comprises a ribbed plate arranged on the inner circumferential wall surface of the pipe curtain unit to improve the structural strength of the pipe curtain unit.

[0009] As a further improvement of the present application, two through grooves are formed on the two sides of the pipe curtain unit and extend through the two ends of the pipe curtain unit, the inner circumferential wall surfaces of the two through groove openings are correspondingly connected to the two ends of the connecting assembly, and

[0010] The connecting assembly is arranged along the longitudinal direction of the pipe curtain unit, so that the internal space of the two adjacent pipe curtain units is isolated from the outside.

[0011] As a further improvement of the present application, the connecting assembly comprises a support structure and two connecting plates.

[0012] The two inner side wall surfaces of the two through groove openings are respectively connected to the two connecting plates, and

[0013] The two ends of the support structure are respectively connected to the two adjacent connecting plates to improve the structural strength of the connecting assembly.

[0014] As a further improvement of the present application, the reinforcing assembly further comprises a tie bar, and the two ends of the tie bar are respectively connected to the inner wall surface of the pipe curtain unit.

[0015] As a further improvement of the present application, the connecting assembly extends into the pipe curtain unit, and one end of the ribbed plate away from the inner wall surface of the pipe curtain unit is connected to the connecting assembly.

[0016] As a further improvement of the present application, the ribbed plate is provided with a through hole to form a longitudinally extending communication space.

[0017] As a further improvement of the present application, an anchor is arranged on the ribbed plate to enhance the connection between the ribbed plate and the concrete.

[0018] The present application also discloses a tunnel support construction method, comprising the following steps:

[0019] S1, the pipe curtain unit is inserted into the preset position;

[0020] S2, the connecting construction of the pipe curtain unit is performed, comprising the following steps:

[0021] S21, installation grooves are formed on the two adjacent side wall surfaces of the two adjacent pipe curtain units,

[0022] S22, the connecting assembly is inserted into the installation groove, and the connecting assembly is correspondingly connected to the inner wall of the installation groove opening;

[0023] S23, welding the support in the interior of the connecting assembly;

[0024] S24, after the construction of one connecting position is completed, repeating the operations of S21-S23 to complete the connecting work of other connecting positions in the longitudinal direction of the pipe roof unit;

[0025] S3, welding the reinforcing member and the anchoring member in the interior of the pipe roof unit;

[0026] S4, pouring concrete into the interior of the pipe roof unit, so that the concrete and the pipe roof unit and the internal structure form a steel-concrete composite structure.

[0027] As a further improvement of the present application, in step S2, the installation groove of the pipe roof unit is a through groove penetrating through both ends of the pipe roof unit, the connecting assemblies are arranged continuously in the longitudinal direction, and

[0028] The two adjacent connecting assemblies in the longitudinal direction are connected correspondingly, so that the interior space of the pipe roof unit is isolated from the surrounding soil.

[0029] As a further improvement of the present application, the construction procedures of each of steps S1, S2 and S3 include the following steps: first, the construction of the pipe roof unit located at the bottom of the tunnel boundary is completed, then the construction of the pipe roof units located on both sides of the tunnel boundary is performed, and finally the construction of the pipe roof unit located at the top of the tunnel boundary is performed.

[0030] The above technical features can be combined with each other as long as they do not conflict with each other.

[0031] Overall, compared with the prior art, the above technical solutions conceived by the present application have the following beneficial effects:

[0032] (1) The tunnel support based on the steel pipe concrete structure and the construction method thereof of the present application, by arranging the pipe roof units at intervals along the circumferential direction of the tunnel, and connecting two adjacent pipe roof units through the connecting assemblies, the interior space between the pipe roof units is connected through the connecting assemblies, and concrete is poured in the interior, so that the pipe roof unit and the steel structure in the interior thereof and the concrete form a steel-concrete composite structure, to serve as the support system of the tunnel;

[0033] (2) The tunnel support based on the steel pipe concrete structure and the construction method thereof of the present application, the connecting assembly includes at least one connecting member and a support structure, the two ends of the connecting member are connected with the inner side wall surfaces of the installation grooves of the pipe roof units correspondingly, the two ends of the support structure are connected with the two adjacent connecting members or on the two side walls in the interior of the connecting member, to improve the structural strength of the connecting assembly as a whole, effectively control the deformation of the steel pipe, and make the connecting assembly sufficient to bear the soil pressure;

[0034] (3) The tunnel support and construction method based on steel pipe concrete structure of the present invention can effectively control the deformation of the excavated strata by setting reinforcing members on the inner wall of the pipe curtain unit.

[0035] (4) The tunnel support and construction method based on steel-concrete composite structure of the present invention extends the end of the connecting component into the pipe curtain unit, so that the connecting component is connected with the reinforcing member, thereby enhancing the connection between the connecting component and the pipe curtain unit and improving the structural strength of the steel-concrete composite structure.

[0036] (5) The tunnel support and construction method based on steel-concrete composite structure of the present invention strengthens the connection between concrete and steel structure inside pipe curtain unit by setting anchors on the reinforcing member, so that the steel-concrete composite structure is stable and reliable. Attached Figure Description

[0037] Fig. 1 This is a schematic diagram of the overall structure of the tunnel support based on the steel-concrete composite structure in an embodiment of the present invention;

[0038] Fig. 2 This is a partial structural schematic diagram of tunnel support based on steel-concrete composite structure in an embodiment of the present invention;

[0039] Fig. 3 This is a schematic diagram of the rib plate in one embodiment of the present invention;

[0040] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1, pipe curtain unit; 2, connecting steel plate; 3, support; 4, rib plate; 5, tie bar; 6, anchor. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0042] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0044] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0046] Embodiment:

[0047] The tunnel support based on the steel pipe concrete structure and the construction method thereof in the preferred embodiment of the present application are as follows Figs. 1-3The steel pipe concrete composite structure comprises pipe-roof units arranged along the tunnel contour in a ring direction and connected by connecting assemblies, and the connecting assemblies are used to connect the internal spaces of two adjacent pipe-roof units 1. The pipe-roof units 1 are arranged along the tunnel longitudinal direction to form the supporting structure of the tunnel.

[0048] As shown in Fig. 1 The steel pipe concrete composite structure comprises pipe-roof units 1 arranged along the tunnel contour in a ring direction and connecting assemblies used to connect adjacent pipe-roof units 1. The connecting assemblies are used to connect the internal spaces of two adjacent pipe-roof units 1. The pipe-roof units 1 are arranged along the tunnel longitudinal direction to form the supporting structure of the tunnel.

[0049] Further, the pipe-roof units 1 are pipe structures extending along the tunnel longitudinal direction, and installation grooves are formed on the side walls of two adjacent pipe-roof units 1 to install the connecting assemblies. The two ends of the connecting assemblies are connected to the inner side walls of the installation grooves of the two adjacent pipe-roof units 1, so that the internal spaces of the two adjacent pipe-roof units 1 are connected. Further preferably, the diameter of the pipe-roof units 1 is greater than 1.8 meters to facilitate the cutting and welding work of the workers inside the pipe-roof units 1.

[0050] In a preferred embodiment, the connecting assembly comprises a connecting steel plate 2, and the two ends of the connecting steel plate 2 are welded to the inner side walls of the installation grooves of the two adjacent pipe-roof units 1, so that the two adjacent pipe-roof units 1 are connected. Further preferably, the connecting steel plate 2 is a plurality of connecting steel plates, and the two ends of each connecting steel plate 2 are welded to the inner side walls of the installation grooves of the two adjacent pipe-roof units 1, and the connecting steel plates 2 are also connected to the side edges, so that the connecting assembly forms a tubular structure and is used to connect the internal spaces of the two pipe-roof units 1.

[0051] In a specific embodiment, the connecting steel plate 2 is an arc-shaped structure, and the two side edges of the arc-shaped steel plate are connected, so that the two arc-shaped steel plates are spliced into a complete circular pipe structure. Correspondingly, the installation grooves between the two adjacent pipe-roof units 1 are also formed as corresponding circular grooves, so that the two arc-shaped steel plates can be welded to the inner side walls of the grooves, and the connecting channel is formed between the two pipe-roof units 1 to realize the connection of the internal spaces of the two adjacent pipe-roof units 1. Further preferably, when the overall size of the circular pipe structure is relatively small compared to the diameter of the pipe-roof units 1, and the circular pipe is easy to transport inside the pipe-roof units 1, the circular pipe structure can be integrally formed, that is, the connecting assembly is a single circular pipe structure.

[0052] As shown in Fig. 2As shown, in Embodiment 1, the mounting groove is a through groove extending longitudinally along the side wall of the pipe curtain unit 1 and penetrating both end faces. This through groove is distributed on both sides of the pipe curtain unit 1, such that the structure of the pipe curtain unit 1 includes two steel pipe shells spaced apart radially along the tunnel. The connecting assembly includes two connecting steel plates 2 distributed radially parallel and spaced apart, respectively connected to the inner side wall of the mounting groove opening to achieve connection between two adjacent pipe curtain units 1. More preferably, multiple connecting steel plates are continuously arranged longitudinally, and adjacent sides of the connecting steel plates 2 are connected to each other to connect the internal spaces of two adjacent pipe curtain units 1, thereby forming a circumferentially connected cavity surrounding the outside of the tunnel clearance in the circumferential direction. This cavity extends longitudinally and is isolated from the outside.

[0053] Furthermore, the connecting assembly also includes a support 3, which is used to connect the connecting members in the connecting assembly or to connect the two inner sidewalls of a single connecting member, so as to improve the structural strength of the connecting assembly and enable the connecting assembly to bear the soil pressure.

[0054] like Fig. 2 As shown, in Embodiment 1 of this application, the support 3 is a steel column structure, with two connecting steel plates 2 welded to its two ends respectively to improve the structural strength of the connecting assembly. The weld between the steel column and the connecting steel plate 2 corresponds to the inner wall of the mounting groove, thus improving both the structural strength of the connecting assembly and the structural strength of the pipe curtain unit 1. More preferably, the steel column is a long rod structure, with its length direction being radial to the tunnel, so that the steel column 3 supports the two connecting steel plates 2 radially to enhance its resistance to soil compression.

[0055] Furthermore, based on the length of the connecting steel plate 2 in the tunnel circumferential direction, multiple steel columns are installed between the two connecting steel plates. More preferably, the steel column structure is internally filled with concrete, forming a steel-concrete composite structure through the outer shell of the steel pipe and the internal concrete, further enhancing the bearing capacity of the connecting components against the soil.

[0056] In a preferred embodiment, the connecting steel plate 2 has a relatively long length in the tunnel circumferential direction, and its steel columns include two steel columns respectively set on both sides of the connecting steel plate 2 (the steel columns are set in the mounting slots), and a steel column is set between the two steel columns to improve the structural strength of the connecting components.

[0057] Furthermore, a reinforcing component is also provided in the tube curtain unit 1 to improve the structural strength of the tube curtain unit 1. The reinforcing component includes ribs 4 and tie bars 5, which are used to strengthen the outer shell structure strength of the tube curtain unit 1 and the overall structural strength of the tube curtain unit, respectively.

[0058] In a preferred embodiment, the rib 4 is a straight plate with an arc-shaped edge, which fits against the inner wall surface of the pipe curtain unit 1 to enhance the structural strength of the outer shell of the pipe curtain unit 1. Multiple ribs 4 are arranged circumferentially along the inner wall surface of the pipe curtain unit. Furthermore, the ribs 4 are pre-welded to the inner wall surface of the steel pipe of the pipe curtain unit 1, and tie bars 5 are provided between the longitudinal ribs 4. The two ends of the tie bars 5 are connected to the inner wall surface of the pipe curtain unit 1, thereby improving the structural strength of the pipe curtain unit 1. Simultaneously, the tie bars 5 also enhance the connection between the pipe curtain unit 1 and the concrete.

[0059] Furthermore, in a preferred embodiment, the edges of the connecting components on both sides of the tube curtain unit 1 extend into the interior of the tube curtain unit 1, and the connecting components on both sides are connected to form an annular upward-facing connected space. The connecting component portion inside the tube curtain unit 1 is fixedly connected to the tube curtain unit 1 via ribs 4. More preferably, the connecting components may extend partially or completely into the interior of the tube curtain unit 1, and the connecting components on both sides of the tube curtain unit 1 are connected to each other.

[0060] like Fig. 2 , 3 As shown, in Embodiment 1, the connecting steel plate 2 extends into the interior of the tube curtain unit 1, so that the edge of the connecting steel plate 2 extends into the interior of the tube curtain unit 1, and the rib plate 4 is a T-shaped plate structure. The T-shaped rib plate includes a web plate and a flange plate arranged perpendicular to the web plate. There are two T-shaped rib plates respectively disposed on the inner wall surface of the two steel pipe shells of the tube curtain unit 1. The edge of the web plate of the T-shaped plate that fits against the inner wall surface of the tube curtain unit 1 is an arc-shaped structure, and the two ends of its flange in the length direction are respectively connected to the two connecting steel plates 2, so that the two rib plates 4 and the connecting steel plates 2 disposed on both sides of them form an annular upward communicating cavity.

[0061] In another specific embodiment, there are multiple ribs 4 arranged continuously along the longitudinal direction, and the flanges of two adjacent ribs 4 are welded together to divide the internal space of the tube curtain unit 1 into three parts in the radial direction. The middle part is the circumferential upward connected space. By opening a first through hole on the web of the rib 4, the upper and lower parts are longitudinally extended connected spaces. Concrete is poured in each connected space to form a steel-concrete composite structure.

[0062] Furthermore, a second through hole is correspondingly provided on the wing plate of the rib plate 4, allowing the tie bar 5 to pass through the second through hole, with its two ends respectively connected to the outer shells of the two steel pipes of the pipe curtain unit 1. More preferably, anchors 6 are also correspondingly provided on the wing plate of the rib plate 4, and there are multiple anchors 6 arranged at certain intervals, and the anchors 6 are preferably studs.

[0063] A tunnel support system based on a steel-concrete composite structure and its construction method, comprising the following steps:

[0064] S1, the operator determines the preset position of the pipe curtain unit 1 according to the contour of the tunnel to be excavated, and inserts the pipe curtain unit 1 outside the boundary of the tunnel to be excavated along the longitudinal direction of the tunnel, and sequentially and interval constructs along the ring direction until the annular structure around the boundary of the tunnel is formed;

[0065] S2, the operator enters two adjacent pipe curtain units 1, cuts mounting grooves on the two adjacent side walls of the two adjacent pipe curtain units 1, inserts connecting steel plates 2 in the mounting grooves, and welds the two connecting steel plates 2 with the inner side walls of the mounting groove openings respectively, and sets a support 3;

[0066] S3, the operator performs internal welding of the pipe curtain unit 1, and welds the reinforcing member and the anchoring member in the pipe curtain unit 1;

[0067] S4, the operator pours concrete into the communication cavity of the pipe curtain unit 1, and forms a steel-concrete structure with the pipe curtain unit 1 and its internal structure;

[0068] S5, after the concrete curing is completed, the construction of the tunnel support structure is completed.

[0069] In step S1, the pipe curtain unit 1 is extended along the longitudinal direction of the tunnel, and after the longitudinal pipe curtain unit 1 is inserted and constructed, the end portions of the two adjacent pipe curtain units 1 are welded correspondingly.

[0070] Further, after determining the preset position of the pipe curtain unit 1, the pipe curtain unit 1 located at the bottom of the tunnel boundary is inserted first, and after the construction is completed, the pipe curtain unit 1 on both sides of the tunnel boundary is inserted and constructed, and finally the pipe curtain unit 1 at the top of the tunnel boundary is inserted and constructed. Further preferably, the insertion work along the ring direction is sequentially performed, that is, after the longitudinal construction of a pipe curtain unit 1 is completed, the insertion construction of the next pipe curtain unit 1 is performed.

[0071] In step S2, it includes the following steps:

[0072] S21, the operator enters the inside of the pipe curtain unit 1, cuts the inner wall of the pipe curtain unit 1, and cuts out the mounting groove, and further, the cutting work of the mounting grooves of the two adjacent pipe curtain units should be performed simultaneously in order to quickly perform the welding work of the connecting assembly;

[0073] S22, two connecting steel plates 2 are inserted into the mounting grooves, the two connecting steel plates 2 are arranged in parallel along the radial direction of the tunnel, and the two ends of the two connecting steel plates 2 are welded with the inner side walls of the mounting groove openings correspondingly;

[0074] Further, the end portions of the two connecting steel plates 2 extend a part into the inside of the pipe curtain unit 1, so as to realize the corresponding connection between the connecting steel plate 2 and the rib plate 4;

[0075] S23, after the connection between the steel plate 2 and the pipe curtain unit 1 is completed, the soil between the two connection steel plates 2 is cleaned, and the support 3 is arranged between the two connection steel plates 2, and the two ends of the support 3 are respectively welded with the two connection steel plates 2;

[0076] Further, the connection between the connection steel plate 2 and the support 3 corresponds to the inner side wall surface of the installation groove slot of the pipe curtain unit 1 at the same time, so that the support 3 not only provides radial support for the two connection steel plates 2, but also provides radial support for the installation groove slot of the pipe curtain unit 1, and improves the structural strength of the pipe curtain unit 1;

[0077] S24, after the construction of a connection area is completed, the installation groove is extended in the longitudinal direction, so that the installation groove is finally formed into a through groove penetrating through both ends of the pipe curtain unit 1, so that the connection construction is continuously carried out in the longitudinal direction of the whole pipe curtain unit 1, which includes two construction methods,

[0078] One is to take the first construction point as the starting point, and sequentially break the side wall surface of the pipe curtain unit 1 to form the installation groove in the longitudinal direction, and start the welding work of the connection at every broken distance in the longitudinal direction. This construction method can ensure the construction precision, but the efficiency is low;

[0079] The second is to simultaneously carry out the corresponding connection welding work after the installation groove is arranged in the longitudinal direction of the pipe curtain unit 1 and is spaced apart, and the installation groove is continuously arranged between the two adjacent installation grooves and the connection construction is continuously carried out. This construction method has high efficiency, but there is a certain construction error.

[0080] Further need to be explained, in the process of inserting construction, the deflection position of the pipe curtain unit 1 needs to be positioned, and a mark is arranged on the inner wall surface of the pipe curtain unit 1. Through the pipe jacking machine or the small shield tunneling machine, the mark is rotated to the preset position of the installation groove when the pipe curtain unit 1 is inserted and constructed, so that the installation groove slots of the two adjacent pipe curtain units 1 are aligned, and in the actual construction, the position of the pipe curtain unit 1 is determined by the level instrument and the like, and then the position of the installation groove slot to be opened is determined, so as to ensure the alignment of the installation groove slots between the two pipe curtain units 1.

[0081] Further, in step 2, the whole construction process is: first, the connection construction of the pipe curtain unit 1 at the bottom of the tunnel boundary is completed, then the connection construction of the pipe curtain unit 1 on both sides of the tunnel boundary is carried out, and finally the connection construction of the pipe curtain unit 1 at the top of the tunnel boundary is completed.

[0082] In step S3, the welding process includes the following steps:

[0083] S31, welding the rib plate 4 on the inner side wall surface of the top and bottom of the pipe-roof unit 1 in the radial direction, i.e. the inner wall surface of the two steel pipe shells;

[0084] S32, welding a steel plate on one end of the rib plate 4 away from the inner side wall surface of the pipe-roof unit 1, and welding the steel plate together with the connecting steel plates 2 on both sides of the pipe-roof unit 1;

[0085] S33, opening a second through hole on the steel plate of the rib plate 4, passing the tie bar 5 through the wing plate, and welding the two ends of the tie bar together with the inner wall surface of the two steel pipe shells;

[0086] S34, welding a plurality of anchoring pieces on the steel plate at certain intervals;

[0087] Further, in step 3, the workers can sequentially construct along the longitudinal direction or connect the welding work between the connecting steel plate 2 and the rib plate 4 at intervals along the longitudinal direction, while the adjacent steel plates need to be welded correspondingly to divide the internal space of the pipe-roof unit 1 into three parts distributed along the radial direction.

[0088] Further, the rib plate 4 can be pre-welded on the pipe-roof unit 1. Further preferably, the rib plate 4 and the steel plate are integrated into a T-shaped rib plate structure.

[0089] Further, the welding construction along the longitudinal direction of the pipe-roof unit 1 has no specific restrictions, and the overall construction work inside the pipe-roof unit still follows the sequence of the bottom, both sides and the top of the tunnel boundary.

[0090] In step S4, concrete is poured into the communication space of the pipe-roof unit 1, and the two longitudinal communication spaces in the pipe-roof unit 1 are realized by opening a first through hole on the rib plate, so that the concrete and the inner side wall surface of the pipe-roof unit 1 (i.e. the side wall surface of the steel pipe shell) and the tie bar 5 form a steel-concrete composite structure, and in the circumferential communication space, the concrete and the connecting steel plate 2, the T-shaped rib plate, the tie bar 5 and the anchoring piece 6 form a steel-concrete composite structure.

[0091] Further, after the construction of the tunnel supporting structure is completed, during the excavation of the tunnel, the connection between the pipe-roof unit 1 and the connecting steel plate 2 exposed on the inner side of the tunnel is supplemented and welded to ensure the welding quality is firm.

[0092] The tunnel support based on the steel pipe concrete structure and the construction method thereof in the application, through the pipe curtain unit arranged along the tunnel contour in a ring shape and at intervals, and the connection between the two adjacent pipe curtain units through the connecting assembly, the connection of the internal space of the pipe curtain unit is realized, and the corresponding reinforcing assembly is arranged in the pipe curtain unit to improve the structural strength of the pipe curtain unit, and the anchor is additionally arranged to strengthen the connection between the internal structure of the pipe curtain unit and the concrete, and the steel pipe concrete combined structure is formed by pouring the concrete in the internal space of the pipe curtain unit to serve as the support system of the tunnel.

[0093] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A tunnel support based on a steel tube concrete structure, comprising a plurality of pipe-roof units arranged along a ring direction of a tunnel and a connecting assembly used to connect two adjacent pipe-roof units, characterized in that: two adjacent pipe-roof units are connected by the connecting assembly and the internal space of the two adjacent pipe-roof units is communicated by the connecting assembly to form a communicated space along the ring direction; a reinforcing assembly is arranged in the pipe-roof unit, the reinforcing assembly comprises a ribbed plate and a tie bar, the ribbed plate is arranged on the inner circumferential wall of the pipe-roof unit to improve the structural strength of the pipe-roof unit; the pipe-roof unit comprises two steel tube shells arranged along a radial direction of the tunnel, the ribbed plate comprises two ribbed plates arranged on the inner walls of the two steel tube shells, the ribbed plate is a T-shaped plate structure comprising a web plate and a wing plate arranged perpendicularly to the web plate, the ribbed plate is a plurality of ribbed plates arranged continuously along a longitudinal direction, the flanges of two adjacent ribbed plates are connected to divide the internal space of the pipe-roof unit into three parts divided along the radial direction; a first through hole is formed in the web plate to form a communicated space extending longitudinally in the upper and lower parts to cast concrete in each communicated space; a second through hole is formed in the wing plate, the tie bar is arranged in the second through hole, and the two ends of the tie bar are connected to the two steel tube shells in the pipe-roof unit; and an anchoring member is arranged on the wing plate to enhance the connection between the ribbed plate and the concrete. 2.The tunnel support based on the steel tube concrete structure according to claim 1, wherein: two through grooves are formed in the two sides of the pipe-roof unit to pass through the two ends of the pipe-roof unit, the inner circumferential walls of the two through grooves are connected to the two ends of the connecting assembly, and the connecting assembly is arranged along the longitudinal direction of the pipe-roof unit to isolate the internal space of the two adjacent pipe-roof units from the outside. 3.The tunnel support based on the steel tube concrete structure according to claim 2, wherein: the connecting assembly comprises a support structure and two connecting plates; the two inner side walls of the two through grooves are connected to the two connecting plates, respectively; and the two ends of the support structure are connected to the two adjacent connecting plates, respectively, to improve the structural strength of the connecting assembly. The connecting assembly extends into the pipe-roof unit, and the wing plate is connected to the connecting assembly. The method comprises the following steps: S1, driving the pipe-roof unit into a preset position; S2, connecting the pipe-roof unit, comprising the following steps: S21, forming installation grooves on the two adjacent side walls of the two adjacent pipe-roof units, S22, inserting the connecting assembly into the installation grooves and connecting the connecting assembly to the inner walls of the installation groove, S23, welding the support in the connecting assembly, S24, after the connection at one position is completed, repeating the operations of S21-S23 to complete the connection at other positions along the longitudinal direction of the pipe-roof unit, S3, welding the reinforcing member and the anchoring member in the pipe-roof unit. ​ ​ 4. The tunnel support based on a concrete filled steel tube structure according to claim 1, wherein, ​ 5. A method of tunnel support construction for the tunnel support construction according to any one of claims 1 to 4, characterized by ​ ​ ​ ​ ​ ​ ​ ​ S4, pouring concrete into the communicating space of the pipe curtain unit, so that the concrete and the pipe curtain unit and its internal structure form a steel-concrete composite structure.

6. The tunnel support construction method according to claim 5, wherein In step S2, the installation groove of the pipe curtain unit is a through groove penetrating through both ends of the pipe curtain unit, the connecting assemblies are arranged continuously in the longitudinal direction, and The corresponding connection of two adjacent connecting assemblies in the longitudinal direction is realized, so that the internal space of the pipe curtain unit is isolated from the external soil body.

7. The tunneling method according to claim 6, wherein The construction procedures of each step S1, S2, S3 include the following steps: first, the construction of the pipe curtain unit located at the bottom of the tunnel boundary is completed, second, the construction of the pipe curtain unit on both sides of the tunnel boundary is carried out, and finally, the construction of the pipe curtain unit located at the top of the tunnel boundary is carried out.

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