Fabricated steel shield negative ring duct piece structure and assembling method thereof

Abstract

The invention discloses an assembly type steel shield negative ring duct piece structure and an assembling method thereof.The steel shield negative ring duct piece structure comprises a plurality of assembling joints of a hollow structure, and the multiple assembling joints are connected end to end and assembled into a whole in a detachable fixing mode; each ring of splicing section is formed by splicing a plurality of splicing blocks with the same number in a detachable fixing mode, and splicing seams of the splicing blocks in every two adjacent rings of splicing sections are staggered in the axis direction of the shield negative ring duct piece structure. The light and firm hollow-out steel skeleton structure is adopted as the negative ring duct piece, and compared with a negative ring duct piece of a prefabricated reinforced concrete structure, the negative ring duct piece has the advantages of being high in structural strength, small in self weight, convenient and fast to assemble and disassemble and capable of being recycled and repeatedly used; the problems that an existing prefabricated reinforced concrete negative ring duct piece is prone to damage and poor in turnover performance, and a waste prefabricated reinforced concrete negative ring duct piece is high in disposal cost and time-consuming and labor-consuming to dismantle are solved.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to an assembled steel shield negative ring segment structure and an assembling method thereof. Background Art

[0002] With the continuous improvement of urbanization level, urban problems are becoming increasingly prominent, and the development and utilization of urban underground space has become one of the effective ways to solve the problems of big cities. At present, shield construction is mostly used in the construction of urban rail transit projects, and the negative ring segments used for shield construction are generally prefabricated reinforced concrete segments.

[0003] However, precast reinforced concrete segments often have the following disadvantages: first, precast reinforced concrete negative ring segments are easily damaged and have poor turnover; second, the disposal cost of reinforced concrete negative ring segments connected to the first positive ring reinforced concrete segments and discarded precast reinforced concrete negative ring segments is high; third, the dismantling of precast reinforced concrete negative ring segments is time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled steel shield negative ring segment structure and an assembly method thereof, so as to solve the technical problems described in the background technology.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: An assembled steel shield negative ring segment structure comprises a plurality of assembly sections of hollow ring structures, wherein the plurality of assembly sections are connected end to end and assembled into a whole in a detachable and fixed manner, each assembly section is composed of a plurality of assembly blocks of an equal number assembled in a detachable and fixed manner, and the joints of the assembly blocks in two adjacent assembly sections are staggered with each other in the axial direction of the shield negative ring segment structure.

[0006] Preferably, the assembly block includes two arc-shaped end plates, which are aligned with each other in the axial direction of the shield negative ring segment structure and are arranged at a certain distance. A number of support columns are arranged between the two arc-shaped end plates, and a cross-sectional connecting plate is arranged at both ends of the two arc-shaped end plates. The ends of the support columns and the cross-sectional connecting plates are detachably connected and fixed to the arc-shaped end plates at corresponding positions.

[0007] Preferably, adjacent assembling sections, adjacent assembling blocks, the support columns and the arc-shaped end plates, and the cross-sectional connecting plates and the arc-shaped end plates are all connected and fixed by high-strength bolts.

[0008] Preferably, the end of the high-strength bolt that plays a connecting and fixing role between the support column and the arc-shaped end plate is fixed to a side plate surface of the arc-shaped end plate by welding.

[0009] Preferably, the support columns of two adjacent ring assembly sections are aligned with each other in the axial direction of the shield negative ring segment structure, the number of the support columns is not less than the number of the shield machine propulsion jacks, and the setting positions of the shield machine propulsion jacks correspond to the setting positions of the support columns.

[0010] Preferably, the support column comprises a supporting steel pipe in the middle and connecting ear plates at the ends.

[0011] Preferably, the assembly section is composed of four assembly blocks.

[0012] In addition, the present invention also provides an assembly method of the above-mentioned assembled steel shield negative ring segment structure, comprising the following steps: Step S1, construction preparation, processing and manufacturing the required parts according to the design drawings and transporting them to the construction site; Step S2, installing a shield starting base and a reaction frame in the starting shaft; Step S3, assembly and commissioning of the shield machine downhole, organizing and completing the acceptance of the starting conditions; Step S4, installing the assembly block at the bottom of the first ring assembly section and fixing it by temporary fixing measures; Step S5, sequentially installing the first and second assembling blocks at the bottom of the second ring assembling section; Step S6, sequentially installing two assembly blocks at the waist position of the first ring assembly section; Step S7, installing the last assembly block at the top of the first ring assembly section to close the first ring assembly section into a ring; Step S8, sequentially installing the third and fourth assembling blocks at the top of the second ring assembling section to close the second ring assembling section into a ring; Step S9, removing the temporary fixing measures at the assembly block at the bottom position of the first ring assembly section, and moving the first ring and second ring assembly sections backward for a distance as a whole; Step S10, installing the assembling blocks of the next ring assembly section in order from bottom to top, and moving the ring assembly sections that have been closed into a ring backward for a certain distance as a whole; Step S11, repeating step S10 until the rear end of the first ring assembly section abuts against the reaction frame, completing the assembly of all ring assembly sections; Step S12, assembling the first ring of reinforced concrete shield segments piece by piece and connecting and fixing them to the last ring of assembly sections.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a light and strong hollow steel skeleton structure as the negative ring segment. Compared with the negative ring segment of the prefabricated reinforced concrete structure, the present invention has the characteristics of high structural strength, light weight, convenient and quick installation and disassembly, and can be recycled and reused. It overcomes the problems of the existing prefabricated reinforced concrete negative ring segment being easy to damage, poor turnover, high disposal cost of discarded prefabricated reinforced concrete negative ring segment, and time-consuming and laborious dismantling; 2. The present invention further sets each component in the assembly block to a detachable structure, which reduces the difficulty of processing and transporting the integral steel structure negative ring segment. In addition, except for the arc-shaped end plate, the support column and the cross-section connecting plate can be recycled as universal parts between steel negative ring segments of different diameters, which effectively improves the flexibility and turnover utilization rate of the negative ring segment. 3. The staggered splicing is adopted between the assembling sections of the present invention, which not only improves the overall strength of the negative ring segment, but also reduces the difficulty of assembling the first ring assembling section. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein: Figure 1 It is a structural schematic diagram of an assembled steel shield negative ring segment structure according to the present invention; Figure 2 It is a structural schematic diagram of the assembly section involved in the present invention; Figure 3 It is a structural schematic diagram of the assembling block involved in the present invention; Figure 4 It is a structural schematic diagram of the arc end plate involved in the present invention; Figure 5 It is a structural schematic diagram of the support column involved in the present invention; Figure 6 It is a structural schematic diagram of a cross-section connecting plate involved in the present invention.

[0015] Figure numerals: 1. assembly section; 2. assembly block; 3. arc-shaped end plate; 4. support column; 5. section connecting plate; 6. high-strength bolt. DETAILED DESCRIPTION

[0016] Hereinafter, an embodiment of an assembled steel shield negative ring segment structure and an assembly method thereof of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all explanatory and exemplary and should not be construed as limitations on the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and specification of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments described herein.

[0017] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "vertical", "upright", "oblique", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0018] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figure 1-6 , the preferred embodiments of the present invention are further described in detail: like Figure 1-2 As shown, a preferred assembled steel shield negative ring segment structure of the present invention comprises a plurality of assembly sections 1 of hollow ring structures, wherein the plurality of assembly sections 1 are connected end to end and assembled into a whole in a detachable and fixed manner, and each assembly section 1 is composed of an equal number of assembly blocks 2 assembled in a detachable and fixed manner, and the joints of the assembly blocks 2 in two adjacent assembly sections 1 are staggered with each other in the axial direction of the shield negative ring segment structure; Firstly, the steel shield negative ring segment structure has high structural strength and durability, and can effectively overcome the problems of easy damage, poor turnover, high disposal cost, time-consuming and laborious dismantling of the existing prefabricated reinforced concrete negative ring segments, and the like. At the same time, the present invention further optimizes the steel shield negative ring segment structure into a hollow steel skeleton structure, which ensures its structural strength while reducing its deadweight to further facilitate installation and disassembly construction. The specific number of rings of the assembly section 1 should be reasonably selected according to the force calculation based on the size of the starting well, the size of the shield machine, and the supporting conditions of the on-site construction. At the same time, the present invention further staggers the joints of the assembly blocks 2 in each ring assembly section 1 to avoid the occurrence of longitudinal through joints, thereby reducing the problem of staggered joints caused by stress deformation of the steel shield negative ring segment structure. At the same time, the staggered joint setting can also reduce the difficulty of assembling the first ring assembly section 1 during assembly construction, thereby improving assembly efficiency. The assembled section 1 of the whole ring prefabricated structure takes up a large extra space during transportation due to its irregular shape, and the transportation convenience is poor. In addition, the turnover of the manufacturing materials is poor, and it is difficult to reuse them in shield construction with different diameters. Figure 3 As shown, in some preferred embodiments, the assembly block 2 includes two arc-shaped end plates 3, the two arc-shaped end plates 3 are aligned with each other in the axial direction of the shield negative ring segment structure and are arranged at a certain distance, a plurality of support columns 4 are arranged between the two arc-shaped end plates 3, and a cross-sectional connecting plate 5 is arranged at both ends of the two arc-shaped end plates 3, and the ends of the support columns 4 and the cross-sectional connecting plate 5 are connected and fixed to the arc-shaped end plates 3 at corresponding positions in a detachable manner. Of course, rubber pads can be added between the outer side surfaces of the arc-shaped end plates 3 and the outer side surfaces of the cross-sectional connecting plates 5 as needed; In order to reduce the difficulty of assembly and improve the overall strength of the assembled structure, adjacent assembly sections 1, adjacent assembly blocks 2, the support columns 4 and the arc-shaped end plates 3, and the cross-section connecting plates 5 and the arc-shaped end plates 3 are all connected and fixed by high-strength bolts 6; like Figure 4 As shown, further, in order to avoid the nut of the high-strength bolt 6 from adversely affecting the fitting of the arc-shaped end plates 3 of the different ring assembly sections 1, the number of slots / holes on the arc-shaped end plates 3 is reduced as much as possible, and the installation efficiency of the high-strength bolt 6 is improved, the end of the high-strength bolt 6 that plays a connecting and fixing role between the support column 4 and the arc-shaped end plate 3 is fixed to a side plate surface of the arc-shaped end plate 3 by welding; like Figure 5 As shown, in some preferred embodiments, the support column 4 includes a supporting steel pipe in the middle and a connecting ear plate at the end, and the main body of the support column 4 is made of a hollow steel pipe to further reduce the deadweight of the steel shield negative ring segment structure while ensuring the structural strength; At the same time, if Figure 6As shown, the cross-sectional connecting plate 5 is made of a steel plate strip of the same material as the arc-shaped end plate 3, and a separate steel plate is bent or welded at the end thereof to form a connecting ear plate. The cross-sectional connecting plate 5 serves as an end sealing plate of the assembly block 2 to connect and fix two adjacent assembly blocks 2 in the same ring assembly section 1; Of course, in order to better play the role of counterforce support for the propulsion jack, such as Figure 1 As shown, in some preferred embodiments, although the assembly sections 1 are staggered and connected in series, it is still necessary to ensure that the support columns 4 of the two adjacent ring assembly sections 1 are aligned with each other in the axial direction of the shield negative ring segment structure, the number of the support columns 4 is not less than the number of the shield machine propulsion jacks, and the setting position of the shield machine propulsion jacks corresponds to the setting position of the support columns 4, so as to prevent the propulsion jacks from abutting against the arc-shaped end plates 3 between the support columns 4; In order to improve the assembly efficiency and the integrity of the assembly section 1 after assembly, the number of assembly blocks 2 in each ring assembly section 1 should not be too many, and 3-5 blocks are preferred. In some preferred embodiments, the assembly section 1 is composed of four assembly blocks 2.

[0020] In addition, the present invention also provides an assembly method for the above-mentioned assembled steel shield negative ring segment structure (taking the embodiment in which each ring assembly section 1 is assembled from four assembly blocks 2 as an example), comprising the following steps: Step S1, construction preparation, processing and manufacturing the required parts according to the design drawings and transporting them to the construction site; Step S2, installing a shield starting base and a reaction frame in the starting shaft; Step S3, assembly and commissioning of the shield machine downhole, organizing and completing the acceptance of the starting conditions; Step S4, installing the assembly block 2 at the bottom of the first ring assembly section 1 (this assembly block 2 is located at the bottom of the first ring assembly section 1) and fixing it by temporary fixing measures. The temporary fixing measures can be reasonably selected according to the actual situation on site, such as using a limit block to directly weld the assembly block 2 to the shield shell; Step S5, sequentially install the first and second assembling blocks 2 at the bottom of the second ring assembling section 1 (the two assembling blocks 2 are respectively located on the left and right sides of the bottom center line of the second ring assembling section 1, and the joint between the two is located on the bottom center line of the second ring assembling section 1), and connect and fix them to the assembling block 2 at the bottom of the first ring assembling section 1; Step S6, sequentially install the two assembling blocks 2 at the waist position of the first ring assembling section 1, and connect and fix them with the assembling block 2 at the bottom position of the first ring assembling section 1 and the first or second assembling block 2 at the bottom position of the second ring assembling section 1; Step S7, installing the last assembling block 2 at the top position of the first ring assembling section 1, and connecting and fixing it with the two assembling blocks 2 at the waist position of the first ring assembling section 1, so that the first ring assembling section 1 is closed into a ring; Step S8, sequentially installing the third and fourth assembling blocks 2 at the top of the second ring assembling section 1, and connecting and fixing them with the assembling blocks 2 corresponding to the first ring assembling section 1 and the second ring assembling section 1, so that the second ring assembling section 1 is closed into a ring; Step S9, remove the temporary fixing measures at the assembly block 2 at the bottom of the first ring assembly section 1, and move the first ring and the second ring assembly section 1 backward as a whole for a distance, and the moving distance must be no less than the ring width of the first ring assembly section 1 to reserve enough assembly space; Step S10, sequentially installing the assembling blocks 2 of the next ring assembling section 1 from bottom to top, and moving the ring assembling sections 1 that have been closed into a ring backward for a certain distance as a whole; Step S11, repeating step S10 until the rear end of the first ring assembly section 1 abuts against the reaction frame, and the assembly of all the ring assembly sections 1 is completed; Step S12, assemble the first ring of positive ring reinforced concrete shield segments piece by piece and connect and fix them to the last ring assembly section 1, then carry out shield advancement construction normally, and after all the shield machines have entered the tunnel and the number of positive ring segments completed is sufficient to provide shield advancement reaction force, remove the steel negative ring segment structure.

[0021] Since the self-weight of the assembling block 2 with a hollow structure is relatively small, the first assembling block 2 needs to be temporarily fixed when the first ring assembling section 1 is installed. Normally, the cross-installation method of the first two ring assembling sections 1 described in the present invention can ensure that the first ring assembling section 1 is stably formed into a ring, and the problem of the assembling block 2 at the waist position collapsing downward will not occur. Of course, in order to increase safety redundancy, temporary fixing measures can also be added to the two assembling blocks 2 at the bottom of the second ring.

[0022] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled steel shield negative ring segment structure, characterized in that: The invention comprises a plurality of assembly sections (1) of hollow ring structures, wherein the plurality of assembly sections (1) are connected end to end and assembled into a whole in a detachable and fixed manner, each assembly section (1) is composed of a plurality of assembly blocks (2) of equal number assembled in a detachable and fixed manner, and the joints of the assembly blocks (2) in two adjacent assembly sections (1) are staggered in the axial direction of the shield negative ring segment structure.

2. The assembled steel shield negative ring segment structure according to claim 1 is characterized by: The assembly block (2) comprises two arc-shaped end plates (3), the two arc-shaped end plates (3) are aligned with each other in the axial direction of the shield negative ring segment structure and are arranged at a certain distance, a plurality of support columns (4) are arranged between the two arc-shaped end plates (3), and a cross-sectional connecting plate (5) is arranged at both ends of the two arc-shaped end plates (3), and the ends of the support columns (4) and the cross-sectional connecting plate (5) are connected and fixed to the arc-shaped end plates (3) at corresponding positions in a detachable manner.

3. The assembled steel shield negative ring segment structure according to claim 2 is characterized by: Adjacent assembly sections (1), adjacent assembly blocks (2), the support column (4) and the arc-shaped end plate (3), and the cross-sectional connection plate (5) and the arc-shaped end plate (3) are all connected and fixed by high-strength bolts (6).

4. The assembled steel shield negative ring segment structure according to claim 3 is characterized by: The end of the high-strength bolt (6) that plays a connecting and fixing role between the support column (4) and the arc-shaped end plate (3) is fixed to a side plate surface of the arc-shaped end plate (3) by welding.

5. The assembled steel shield negative ring segment structure according to claim 2 is characterized by: The support columns (4) of two adjacent ring assembly sections (1) are aligned with each other in the axial direction of the shield negative ring segment structure, the number of the support columns (4) is not less than the number of the shield machine propulsion jacks, and the setting positions of the shield machine propulsion jacks correspond to the setting positions of the support columns (4).

6. The assembled steel shield negative ring segment structure according to claim 2 is characterized by: The support column (4) comprises a supporting steel pipe in the middle and connecting ear plates at the ends.

7. The assembled steel shield negative ring segment structure according to claim 1 is characterized by: The assembly section (1) is assembled from four assembly blocks (2).

8. An assembly method, used in the assembly process of the assembled steel shield negative ring segment structure as claimed in claim 7, characterized in that: The steps include: Step S1, construction preparation, processing and manufacturing the required parts according to the design drawings and transporting them to the construction site; Step S2, installing a shield starting base and a reaction frame in the starting shaft; Step S3, assembly and commissioning of the shield machine downhole, organizing and completing the acceptance of the starting conditions; Step S4, installing the assembly block (2) at the bottom of the first ring assembly section (1) and fixing it by temporary fixing measures; Step S5, sequentially installing the first and second assembling blocks (2) at the bottom of the second ring assembling section (1); Step S6, sequentially assembling the two assembling blocks (2) at the waist position of the first ring assembling section (1); Step S7, installing the last assembly block (2) at the top position of the first ring assembly section (1) to close the first ring assembly section (1) into a ring; Step S8, sequentially installing the third and fourth assembling blocks (2) at the top of the second ring assembling section (1) to close the second ring assembling section (1) into a ring; Step S9, removing the temporary fixing measures at the assembly block (2) at the bottom of the first ring assembly section (1), and moving the first ring and second ring assembly sections (1) backwards as a whole for a certain distance; Step S10, sequentially installing the assembling blocks (2) of the next ring assembling section (1) from bottom to top, and moving the ring assembling sections (1) that have been closed into a ring backwards for a certain distance as a whole; Step S11, repeating step S10 until the rear end of the first ring assembly section (1) abuts against the reaction frame, completing the assembly of all the ring assembly sections (1); Step S12, assembling the first ring of reinforced concrete shield segments piece by piece and connecting and fixing them to the last ring of assembly sections (1).

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