Shield rapid launching gate-type support device and method

Abstract

The invention relates to the technical field of shield engineering construction, in particular to a fast shield launching gate-type support device and method.The fast shield launching gate-type support device comprises a plurality of gate-type supports, transverse connecting pieces, longitudinal connecting pieces, transverse supporting pieces, longitudinal supporting pieces and middle plate supports; the gate-type supports are arranged at intervals in the extending direction of the shield starting well, each gate-type support comprises two stand columns symmetrically arranged along the two sides of the shield starting well and cross beams arranged on the tops of the two stand columns in a crossing mode, the transverse connecting pieces are used for connecting every two adjacent cross beams, the longitudinal connecting pieces are used for connecting every two adjacent stand columns, and the transverse connecting pieces and the longitudinal connecting pieces are arranged on the gate-type supports. The middle plate support is arranged at the top of the cross beam and connected with the cross beam through a pre-embedded fixing part, shield construction and station main body structure construction are conducted synchronously, and the overall efficiency and economical efficiency of subway engineering are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling engineering construction, and particularly relates to a shield rapid launching gantry support device and method. Background Art

[0002] In subway construction, a shield machine is a special construction machinery for tunnel boring, which has functions such as excavating and cutting soil, transporting soil residue, assembling tunnel linings, and measuring and guiding deviation correction. It is a key construction equipment for subway construction. However, in the prior art, the support on the station platform layer needs to be removed before the shield machine starts to reserve space for the passage of the trolley and battery car. However, the removal of the shield machine platform layer support must wait until the construction of the top plate of the station main structure is completed and reaches 100% of the design strength. This process seriously restricts the progress of shield construction, resulting in construction period delays and resource waste. In addition, the removal and reconstruction of the disk buckle support require a large amount of manpower and time, further exacerbating the construction complexity. Summary of the Invention

[0003] The purpose of the present invention is to provide a shield rapid launching gantry support device and method for the deficiencies of the prior art, so as to simplify the preparation process before the shield machine starts and improve the shield speed.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] In the first aspect, the present invention provides a shield rapid launching gantry support device, including:

[0006] A gantry support, a transverse connecting member, a longitudinal connecting member, a transverse support member, a longitudinal support member, and a middle plate support;

[0007] There are multiple gantry supports, which are arranged at intervals along the extension direction of the shield launching shaft. Each gantry support includes two columns symmetrically arranged on both sides of the shield launching shaft, and a cross beam spanning the tops of the two columns. The transverse connecting member is used to connect every two adjacent cross beams, the longitudinal connecting member is used to connect every two adjacent columns, and the middle plate support is arranged on the top of the cross beam and is connected to the cross beam through a pre-embedded fixing member;

[0008] There are multiple longitudinal support members, which are used to connect the columns in two adjacent gantry supports at the end of the shield launching shaft and are distributed at intervals along the longitudinal direction of the columns;

[0009] There are multiple transverse support members, which are used to connect the cross beams in two adjacent gantry supports at the end of the shield launching shaft and are distributed at intervals along the extension direction of the cross beams.

[0010] In some embodiments, the longitudinal support members are rigid rods arranged in a cross pattern, and the transverse support members are rigid rods extending horizontally and arranged in a cross pattern.

[0011] In some embodiments, the embedded fixing member is a metal anchor welded vertically to the top of the crossbeam, and the column is fixed to the anchor.

[0012] In some embodiments, the spacing between the two columns in each gantry bracket is set based on the width requirements of the trolley or battery car.

[0013] Second, the present invention also provides a method for rapid shield starting, based on the gantry bracket device described in any one of the above, including the following steps:

[0014] S1. Pour a column foundation at the bottom slope of the side wall area of the shield starting shaft to form a horizontal support surface;

[0015] S2. Set up gantry brackets on the support surface and fix adjacent gantry brackets through transverse connecting members and longitudinal connecting members;

[0016] S3. Install a middle plate bracket on the top of the gantry bracket and connect the column and the crossbeam through an embedded fixing member;

[0017] S4. Synchronously carry out the construction of the top plate of the shield starting shaft and the main structure of the station until the top plate reaches the predetermined strength;

[0018] S5. After the construction of the top plate of the starting shaft is completed, install the shield reaction device and the negative ring segments, and hoist the shield machine to the starting shaft;

[0019] S6. Start the shield machine to start and maintain the support of the gantry bracket device for the main structure of the station during the starting process;

[0020] S7. After starting the shield machine, synchronously carry out the construction of the main structure of the station.

[0021] In some embodiments, the connection methods of the transverse connecting members and the longitudinal connecting members are selected based on the spacing and angle of the gantry brackets.

[0022] In some embodiments, in step S4, the top plate construction includes concrete pouring and curing processes, and the gantry bracket device continuously provides support during the curing period.

[0023] In some embodiments, in step S4, the predetermined strength is 100% of the design strength.

[0024] In some embodiments, in step S5, the installation position of the reaction device corresponds to the layout of the gantry brackets, and the assembly direction of the negative ring segments is aligned with the starting axis of the shield machine.

[0025] In some embodiments, in step S6, the starting parameters of the shield machine are dynamically adjusted based on the bearing capacity of the gantry support device.

[0026] Furthermore, the beneficial effects of the present application are as follows:

[0027] By adding a designed gantry support and designing the gantry support as a combination of rigid connections between columns and crossbeams to form a stable structure with high bearing capacity, the present application can not only provide a reaction force support for the starting of the shield machine but also meet the passing requirements of the trolley and the battery car. Its span and height can be flexibly adjusted according to the actual construction scenario. For example, a 32a I-beam is used to achieve a span of 4.6m in the trolley passing area, and a 20a I-beam is used to achieve a span of 1.9m in the battery car area.

[0028] Secondly, on the premise that the construction of the top plate of the starting shaft of the device in the present application is completed, shield starting is allowed when the top plate of the main structure of the station is not completed and the brackets on the platform layer are not removed, significantly shortening the process connection time and solving the pain points of the mutual restriction of the construction progress in the traditional scheme.

[0029] In addition, through designs such as welding embedded fixtures, adding transverse support members, and longitudinal support members, etc., the gantry support ensures the rigidity and stability of the overall structure and can effectively support the construction of the main structure of the station even under heavy load conditions.

[0030] Finally, the present invention realizes the simultaneous progress of shield construction and the construction of the main structure of the station, significantly improving the overall efficiency and economy of the subway project. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the gantry support device for rapid shield starting provided by the present invention;

[0032] Figure 2 It is a schematic diagram of the upper gantry support structure in the gantry support device for rapid shield starting provided by the present invention;

[0033] Figure 3 It is a side view of the gantry support in the gantry support device for rapid shield starting provided by the present invention;

[0034] Figure 4 It is a top view of the gantry support in the gantry support device for rapid shield starting provided by the present invention;

[0035] Figure 5 It is a schematic diagram of the steps of the method for rapid shield starting provided by the present invention.

[0036] In the figure: 1 - column, 2 - crossbeam, 3 - transverse connecting member, 4 - longitudinal connecting member, 5 - longitudinal support member, 6 - transverse support member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two. Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In the first aspect, as Figures 1-4 shown, an embodiment of the present invention provides a shield rapid starting gantry support device, including:

[0039] Gantry supports, transverse connectors 3, longitudinal connectors 4, transverse support members 6, longitudinal support members 5, and middle plate supports;

[0040] There are a plurality of gantry supports, which are arranged at intervals along the extending direction of the shield starting shaft. Each gantry support includes two columns 1 symmetrically arranged on both sides of the shield starting shaft, and a cross beam 2 straddling the tops of the two columns 1. The transverse connector 3 is used to connect every two adjacent cross beams 2, the longitudinal connector 4 is used to connect every two adjacent columns 1, the middle plate support is arranged on the top of the cross beam 2, and is connected to the cross beam 2 through a pre-embedded fixing member;

[0041] In the above structure, in the present application, the transverse connector 3 is a connecting rod connecting the cross beam 2, which can be made of 20a I-beam, the longitudinal connector 4 is a connecting rod connecting the column 1, which can be made of No. 10 channel steel. At the same time, the middle plate support is arranged on the top of the cross beam 2 and is connected to the cross beam 2 through a pre-embedded fixing member. The pre-embedded fixing member is a metal anchor vertically welded to the top of the cross beam 2, and the anchor can be a threaded steel with a length of 30 cm and a diameter of 28, which is welded to the cross beam 2 and connected to the column 1 to ensure the stability of the column 1.

[0042] In this embodiment, the distance between the two columns 1 in each gantry bracket is set based on the width requirements of the trolley or battery car. Based on this, the present invention will use specific data to describe the sizes of other components in the present invention. It should be noted that the specific data cited in this embodiment of the present invention are only for illustrative purposes, and the present application does not make specific limitations on the sizes of the components, and the application also intends to include such size changes. For example: the height of column 1 is 5.5m. When a trolley needs to pass through, column 1 uses 32a I-beam, and at this time, the length of crossbeam 2 is 4.6m, also using 32a I-beam. When a battery car needs to pass through, column 1 uses 20a I-beam, and the length of crossbeam 2 is 1.9m, also using 20a I-beam. And the column 1 and the crossbeam 2 can adopt a welded fixing method, so that the gantry bracket formed by the crossbeam 2 and the column 1 has good stability and rigidity, and at the same time has sufficient bearing capacity and stability.

[0043] In addition, in this embodiment, there are multiple longitudinal support members 5, which are used to connect the columns 1 in two adjacent gantry brackets at the end of the shield launching shaft and are spaced along the longitudinal direction of the column 1;

[0044] There are multiple transverse support members 6, which are used to connect the crossbeams 2 in two adjacent gantry brackets at the end of the shield launching shaft and are spaced along the extending direction of the crossbeam 2. The longitudinal support members 5 are rigid rods arranged in a cross manner, and the transverse support members 6 are rigid rods extending horizontally and arranged in a cross manner. The present application adopts the spaced longitudinal support members 5 and the transverse support members 6, and at the same time arranges both the longitudinal support members 5 and the transverse support members 6 in a cross manner, so that there is better stability between the columns 1 and between the crossbeams 2. In addition, the longitudinal support members 5 and the transverse support members 6 in the present application are arranged at intervals, so as to better distribute the stress between the columns 1 and between the crossbeams 2. The interval distance of the spaced arrangement can be set to 30 cm in the present application, and the present application does not make specific limitations on this.

[0045] In a second aspect, please refer to Figure 5 , the present invention also provides a shield rapid launching method, based on the gantry bracket device of any one of the above, including the following steps:

[0046] S1. Pour the foundation of column 1 at the bottom slope of the side wall area of the shield launching shaft to form a horizontal support surface;

[0047] S2. Erect gantry brackets on the support surface and fix adjacent gantry brackets through transverse connectors 3 and longitudinal connectors 4;

[0048] S3. Install a middle plate bracket on the top of the gantry bracket and connect the column 1 and the crossbeam 2 through embedded fixing parts;

[0049] S4. Simultaneously conduct the construction of the top slab of the shield launching shaft and the main structure of the station until the top slab reaches the predetermined strength;

[0050] S5. After the construction of the top slab of the launching shaft is completed, install the reaction device of the shield machine and the negative ring segments, and hoist the shield machine to the launching shaft;

[0051] S6. Start the shield machine to launch, and maintain the support of the gantry support device for the main structure of the station during the launching process;

[0052] S7. After starting the shield machine to launch, simultaneously conduct the construction of the main structure of the station.

[0053] In a possible implementation manner, the transverse connecting member 3 and the longitudinal connecting member 4 select the connection method based on the spacing and angle of the gantry support, and conduct force calculation and strength check to ensure that the gantry support system meets the requirements. At the same time, design the gantry support according to the length of the trolley passing area being greater than 4.6m span, or design the gantry support according to the span of the battery car passing area being greater than 1.9m to ensure the normal passage of the trolley and the battery car.

[0054] In a possible implementation manner, in step S4, the top slab construction includes concrete pouring and curing processes, and the gantry support device continuously provides support during the curing period, and the predetermined strength is 100% of the design strength.

[0055] In a possible implementation manner, in step S5, the installation position of the reaction device corresponds to the layout of the gantry support, and the assembling direction of the negative ring segments is aligned with the launching axis of the shield machine, where the reaction device and the negative ring segments are used to provide reaction force for the shield machine to launch.

[0056] In a possible implementation manner, in step S6, the launching parameters of the shield machine are dynamically adjusted based on the bearing capacity of the gantry support device, so that the shield machine can better change the operation parameters according to the actual situation during the whole shield operation.

[0057] Based on this, this application will elaborate on the detailed method of this application in combination with specific embodiments:

[0058] S101: Pour the foundation of column 1: The column 1 on the side of the gantry frame close to the side wall falls on the inclined corner of the bottom slab. To ensure the normal force bearing of column 1 of the gantry frame and not damage the bottom slab structure, before the gantry frame is erected after the side wall is poured, a customized wooden box is used at the bottom of column 1 on the side close to the side wall to pour the foundation of column 1, so that the bottom of column 1 can fall on a flat bottom to ensure uniform force bearing of column 1.

[0059] S201: Erect the gantry frame: According to the construction plan and on-site conditions, erect the gantry support. Ensure the accurate installation and connection of components such as column 1, cross beam 2 and connecting members.

[0060] S301: Erection of middle plate support: Erection of middle plate disc-type support and middle plate disc-type support on the top of portal support beam 2 is carried out.

[0061] S401: Construction of terminal departure shaft: Carry out the main structure construction of the station according to the construction plan until the top plate construction of the terminal departure shaft is completed and reaches 100% of the design strength.

[0062] S501: Preparation work before the start of the shield machine: After the construction of the end starting shaft is completed, the tunnel door is broken, and the steel sleeve and reaction frame are installed and positioned. Then, the crawler crane is used to lift the main machine of the shield machine into the starting shaft, and it is assembled and debugged in the steel sleeve to ensure the normal operation of the equipment. Finally, the negative ring segments are assembled at the tail of the shield machine to provide reaction force for the start of the shield machine.

[0063] S601: Shield machine start: Conduct trial excavation before start, set reasonable excavation parameters, and after confirming that everything is ready, start the shield machine for formal start.

[0064] S701: Main structure construction: During the start-up of the shield machine, the main structure construction of the station will proceed normally.

[0065] In the above steps, the device in the present application can, under the premise that the construction of the starting shaft top plate is completed, allow the shield to be quickly started when the construction of the station main structure top plate is not completed and the platform layer support is not removed, thereby greatly reducing the impact of the station main structure construction progress on the shield construction progress and improving the overall construction efficiency of the subway construction. Secondly, the use of a gantry support instead of a disc-type support can not only reserve sufficient space for the passage of trolleys and electric vehicles when the shield starts, but also replace the disc-type support as a load-bearing system. Finally, the gantry frame device is simple to operate, and through reasonable connection methods and structural design, it ensures the stability and bearing capacity of the support when bearing heavy loads, facilitates the construction of the station main structure, and improves the convenience and efficiency of construction.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A portal support device for rapid shield starting, characterized in that, include: Portal brackets, transverse connectors, longitudinal connectors, transverse supports, longitudinal supports and mid-plate brackets; There are multiple gantry supports, which are arranged at intervals along the extension direction of the shield launch shaft. Each gantry support includes two columns symmetrically arranged on both sides of the shield launch shaft, and a crossbeam spanning the tops of the two columns. The transverse connecting piece is used to connect each two adjacent crossbeams, and the longitudinal connecting piece is used to connect each two adjacent columns. The middle plate support is arranged on the top of the crossbeam and connected to the crossbeam through a pre-embedded fixing piece. There are a plurality of longitudinal support members, which are used to connect the columns in two adjacent portal brackets at the ends of the shield starting shaft and are distributed at intervals along the longitudinal direction of the columns; There are multiple transverse support members, which are used to connect the crossbeams in two adjacent portal supports at the ends of the shield starting shaft and are distributed at intervals along the extension direction of the crossbeams.

2. The shield rapid launching gantry support device according to claim 1, wherein, The longitudinal support members are cross-arranged rigid rods, and the transverse support members are horizontally extended and cross-arranged rigid rods.

3. The shield rapid launching gantry support device according to claim 1, characterized in that, The embedded fixing piece is a metal anchor piece vertically welded to the top of the beam, and the column is fixed to the anchor piece.

4. The shield rapid launching gantry support device according to claim 1, wherein The distance between the two upright posts in each of the gantry brackets is set based on the width requirement of the trolley or battery vehicle.

5. A rapid shield starting method, based on the gantry support device according to any one of claims 1-4, characterized in that, The following steps are involved: S1. Cast the column foundation on the slope of the bottom plate in the side wall area of ​​the shield starting shaft to form a horizontal support surface; S2, erecting a portal bracket on the support surface, and fixing adjacent portal brackets through transverse connectors and longitudinal connectors; S3. Install the middle plate bracket on the top of the portal bracket and connect the column and the beam through the embedded fixings; S4. Simultaneously carry out the construction of the shield starting shaft roof and the station main structure until the roof reaches the predetermined strength; S5. After the top plate construction of the launch shaft is completed, the shield machine reaction device and negative ring segments are installed, and the shield machine is hoisted to the launch shaft; S6. Start the shield machine and keep the portal support device supporting the main structure of the station during the start-up process; S7. After the shield machine is started, the construction of the main structure of the station is carried out simultaneously.

6. The shield rapid launching method according to claim 5, wherein, In step S2, the horizontal connectors and the vertical connectors are connected in a manner based on the spacing and angle of the portal support.

7. The shield rapid launching method according to claim 5, wherein In step S4, the roof construction includes concrete pouring and curing processes, and the portal support device continues to provide support during the curing period.

8. The shield rapid launching method according to claim 5, wherein In step S4, the predetermined strength is 100% of the design strength.

9. The shield rapid launching method according to claim 5, characterized in that, In step S5, the installation position of the reaction device corresponds to the layout of the portal support, and the assembly direction of the negative ring segment is aligned with the starting axis of the shield machine.

10. The shield rapid launching method according to claim 5, characterized in that, In step S6, the starting parameters of the shield machine are dynamically adjusted based on the bearing capacity of the portal support device.

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