Fabricated steel shield negative ring duct piece structure

Abstract

The utility model discloses an assembly type steel shield negative ring duct piece structure which comprises a plurality of ring hollow structure splicing sections, the ring splicing sections are connected end to end and spliced into a whole in a detachable fixing mode, each ring splicing section is formed by splicing a plurality of splicing blocks in a detachable fixing mode, and the number of the splicing blocks is equal to that of the splicing sections. And splicing seams of the splicing blocks in every two adjacent rings of splicing sections are mutually staggered in the axis direction of the shield negative ring duct piece structure. According to the utility model, 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 characteristics of high structural strength, light dead weight, convenience and rapidness in assembly and disassembly and reusability; 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 utility model relates to the technical field of shield construction, in particular to an assembled steel shield negative ring segment structure. Background Art

[0002] With the continuous improvement of urbanization, urban problems are becoming increasingly prominent. The development and utilization of urban underground space has become one of the effective ways to solve the problems of large cities. Currently, shield construction is mostly used for urban rail transit projects. 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 ring 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. Utility Model Content

[0004] The purpose of the utility model is to provide an assembled steel shield negative ring segment structure 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:

[0006] A prefabricated steel shield negative ring segment structure includes several assembly sections with hollow ring structures. The several ring assembly sections are connected end to end and assembled into a whole in a detachable and fixed manner. Each ring assembly section is composed of an equal number of assembly blocks assembled in a detachable and fixed manner, and the joints of the assembly blocks in two adjacent ring assembly sections are staggered with each other in the axial direction of the shield negative ring segment structure.

[0007] 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 provided at both ends of the two arc-shaped end plates. The ends of the support columns and the cross-sectional connecting plates are connected and fixed to the arc-shaped end plates at corresponding positions in a detachable manner.

[0008] 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.

[0009] 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 in a welding manner.

[0010] 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.

[0011] Preferably, the support column includes a supporting steel pipe in the middle and connecting ear plates at the ends.

[0012] Preferably, the assembly section is composed of four assembly blocks.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This utility model adopts a lightweight and strong hollow steel skeleton structure as the negative ring segment. Compared with the negative ring segment of prefabricated reinforced concrete structure, it has the characteristics of high structural strength, light weight, convenient and quick installation and removal, and turnover and reuse. It overcomes the problems of existing prefabricated reinforced concrete negative ring segments, such as easy damage, poor turnover, high disposal cost of discarded prefabricated reinforced concrete negative ring segments, and time-consuming and labor-intensive removal;

[0015] 2. The present invention further configures all components in the assembly block to be detachable, reducing the difficulty of processing and transporting the integral steel structure negative ring segments. In addition, except for the curved end plates, the support columns and cross-section connecting plates can be recycled as universal parts between steel negative ring segments of different diameters, effectively improving the flexibility and turnover rate of the negative ring segments.

[0016] 3. The utility model adopts staggered splicing between the assembling sections, 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

[0017] 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. These drawings are only illustrative and do not limit the present invention, wherein:

[0018] Figure 1 This is a structural schematic diagram of an assembled steel shield negative ring segment structure involved in the utility model;

[0019] Figure 2 This is a structural diagram of the assembly section involved in the utility model;

[0020] Figure 3 This is a structural diagram of the assembly block involved in the utility model;

[0021] Figure 4 This is a structural diagram of the arc-shaped end plate involved in the present utility model;

[0022] Figure 5 This is a structural diagram of the support column involved in the utility model;

[0023] Figure 6 This is a structural diagram of the cross-section connecting plate involved in the present utility model.

[0024] 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

[0025] Hereinafter, an embodiment of an assembled steel shield negative ring segment structure 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 interpreted as limiting the implementation methods and 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 description of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments described herein.

[0026] In the description of the present invention, it should be noted that the terms "front," "back," "left," "right," "top," "bottom," "upper," "lower," "inner," "outer," "horizontal," "vertical," "upright," and "oblique" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] The accompanying drawings in this specification are schematic diagrams that assist in illustrating the concepts of the present invention and schematically illustrate the shapes of the various components and their interrelationships. Please note that to clearly illustrate the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0028] The following describes the principles and features of the present invention in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. Figure 1-6 , the preferred embodiments of the present invention are further described in detail:

[0029] like Figure 1-2As shown, the utility model preferably adopts an assembled steel shield negative ring segment structure, comprising a plurality of assembly sections 1 of a hollow ring structure, 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;

[0030] First of all, 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, and time-consuming and labor-intensive dismantling of existing prefabricated reinforced concrete negative ring segments. At the same time, the utility model further optimizes the steel shield negative ring segment structure into a hollow steel skeleton structure, ensuring its structural strength while reducing its own weight 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 shaft, the size of the shield machine, and the supporting conditions of on-site construction. At the same time, the utility model further staggers the joints of the assembly blocks 2 in each ring assembly section 1 to avoid longitudinal through seams, 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 and improve assembly efficiency.

[0031] 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. Moreover, 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, 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 plurality of support columns 4 are arranged between the two arc-shaped end plates 3, and a cross-sectional connecting plate 5 is provided at both ends of the two arc-shaped end plates 3. The ends of the support columns 4 and the cross-sectional connecting plate 5 are detachably connected and fixed to the arc-shaped end plates 3 at corresponding positions. 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.

[0032] 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;

[0033] like Figure 4As shown, further, in order to avoid the adverse effect of the nut of the high-strength bolt 6 on 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 one side plate surface of the arc-shaped end plate 3 by welding;

[0034] like Figure 5 As shown, in some preferred embodiments, the support column 4 includes a supporting steel pipe in the middle and connecting ear plates at the ends. 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 structural strength.

[0035] At the same time, if Figure 6 As shown, the cross-section connecting plate 5 is made of a steel plate strip of the same material as the arc-shaped end plate 3, and its end is bent or welded to a separate steel plate to form a connecting ear plate. The cross-section connecting plate 5 serves as an end sealing plate of the assembly block 2 to connect and fix the two adjacent assembly blocks 2 in the same ring assembly section 1;

[0036] Of course, in order to better play the role of counterforce support for the propulsion jack, such as Figure 1 As shown, in certain 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 positions of the shield machine propulsion jacks correspond to the setting positions 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;

[0037] 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, preferably 3-5 blocks. In some preferred embodiments, the assembly section 1 is composed of four assembly blocks 2.

[0038] In addition, the present invention also provides an assembly method for the above-mentioned prefabricated 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:

[0039] Step S1, construction preparation, processing and manufacturing the required parts according to the design drawings and transporting them to the construction site;

[0040] Step S2, installing the shield starting base and reaction frame in the starting shaft;

[0041] Step S3: assembling and debugging the shield machine downhole, organizing and completing the acceptance of the starting conditions;

[0042] Step S4: Install 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 fix it by temporary fixing measures. The temporary fixing measures can be reasonably selected according to the actual situation on site, such as using limit blocks to directly weld the assembly block 2 to the shield shell;

[0043] 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;

[0044] 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;

[0045] 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;

[0046] 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;

[0047] Step S9: Remove the temporary fixing measures at the assembly block 2 at the bottom of the first ring assembly section 1, and push the first and second ring assembly sections 1 backward as a whole for a distance. The pushing distance must be no less than the ring width of the first ring assembly section 1 to reserve sufficient assembly space.

[0048] Step S10, sequentially installing the assembling blocks 2 of the next ring assembly section 1 from bottom to top, and moving the ring assembly sections 1 that have been closed into a ring backward for a distance;

[0049] 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 ring assembly sections 1;

[0050] 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. After that, carry out the shield advancement construction normally. After all the shield machines have entered the tunnel and the number of completed positive ring segments is sufficient to provide shield advancement reaction force, remove the steel negative ring segment structure.

[0051] Since the hollow structure of the assembling block 2 has a small weight, the first assembling block 2 needs to be temporarily fixed when the first ring assembling section 1 is installed. Under normal circumstances, the cross-installation method of the first two ring assembling sections 1 described in the utility model can ensure that the first ring assembling section 1 is stable in 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.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An assembled steel shield negative ring segment structure, characterized by: The invention comprises a plurality of ring-shaped hollow structure assembly sections (1), wherein the plurality of ring-shaped assembly sections (1) are connected end to end and assembled into a whole in a detachable and fixed manner, each ring-shaped 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 ring-shaped assembly sections (1) are staggered with each other in the axial direction of the shield negative ring segment structure.

2. The assembled steel shield negative ring segment structure according to claim 1, characterized in that: 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 provided 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, characterized in that: 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).

4. The assembled steel shield negative ring segment structure according to claim 3, characterized in that: 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) in a welding manner.

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

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