A construction method for temporary supporting structure of corrugated plate for initial support of traveling tunnel

Abstract

The present invention discloses a construction method of a temporary support structure of a corrugated plate for a traveling tunnel, comprising the following steps: after the construction of the upper step of the tunnel is completed, the upper step corrugated plate is installed to the corresponding position and the arch foot of the upper step corrugated plate is connected to the suspension body; the track plate is laid and the support structure is installed on the track plate; the support structure is pushed to move to an appropriate position, and the contact body and the suspension body are connected together to support the arch foot of the upper step corrugated plate. The advantages of the present invention are: the construction method is simple, and the support of the arch foot of the upper step corrugated plate is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support, in particular to a construction method of a temporary supporting structure of a corrugated plate for an initial support of a traveling tunnel. Background Art

[0002] With the rapid development of modern transportation facilities, various tunnel construction projects are springing up, such as urban subway tunnels and western mountain tunnels. With the continuous development of tunnel structure support concepts, especially the continuous innovative application of the new Austrian method support form for mountain tunnels, the compression support concept has received more attention, that is, allowing the outer rock (soil) body to deform to a certain extent to release part of the surrounding rock stress, and the tunnel support form using assembled steel corrugated plates has emerged. The assembled steel corrugated plate support structure can give full play to the advantages of assembled rapid support construction, but in actual application, due to the limitations of the surrounding rock geological conditions, tunnel excavation construction is often not excavated into a hole at one time, but adopts a step method of segmented and layered excavation mode. In the support process, it is necessary to install support corrugated plates in layers according to the specific layered excavation steps. For example, in the commonly used three-step method construction process, it is necessary to install corrugated plates on the upper step, middle step and lower step excavation sections in turn. However, due to the influence of complex factors, the assembly interval between the upper step corrugated plate and the middle step corrugated plate is often long, and the arch foot of the upper step corrugated plate is suspended for a long time, causing the upper step corrugated plate to undergo obvious displacement and deformation, seriously affecting the support effect of the upper step corrugated plate and the overall splicing accuracy of the corrugated plate. In order to enable the upper step to fully exert its support effect and overcome the weight of the corrugated plate itself, a certain number of arch foot anchor rods are often driven into the surrounding rock at the arch foot of the upper step in the design. In actual engineering applications, how to design a temporary support form to reduce the use of arch foot anchor rods while ensuring the support role of the arch foot of the upper step is an urgent need for the assembly and construction of corrugated plates during the step method construction process. Summary of the invention

[0003] The purpose of the present invention is to provide a construction method for a temporary support structure of the initial corrugated plate of a traveling tunnel based on the above-mentioned deficiencies of the prior art. By laying track plates in the tunnel and installing support structures on the track plates, support is achieved at the arch foot of the upper step corrugated plate.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A construction method for a temporary supporting structure of a corrugated plate for a traveling tunnel, characterized in that the construction method comprises the following steps:

[0006] (S1) After the construction of the upper step of the tunnel is completed, the upper step corrugated plate is installed to the corresponding position and the arch foot of the upper step corrugated plate is connected to the cantilever body;

[0007] (S2) laying track plates and installing support structures on the track plates; wherein the track plates include a first track plate and a second track plate, the first track plate being installed on a base of a middle step, and the second track plate being installed on a base of a lower step or a tunnel floor; the support structure includes a support top arch rod, a middle step support column, a lower step support column, a support crossbeam and a contact body, the support top arch rod being arranged transversely and three of them being arranged at intervals in the longitudinal direction, the ends of the support top arch rod located in the middle and the end of the support top arch rod located in the rear being connected to the middle step support column and the lower step support column respectively, the lower step support column being slidably installed on the second track plate via a column roller at its bottom, and the middle step support column being slidably installed on the first track plate via a column roller at its bottom; the support top arch rods are connected via the support crossbeam and a plurality of the contact bodies are arranged at intervals along the length direction of the support crossbeam;

[0008] (S3) Pushing the support structure to move to a proper position along the track plate, and connecting the contact body and the suspension body together to support the arch foot of the upper step corrugated plate.

[0009] The two ends of the guide rail are connected with the support rail at two ends, and the other ends of the guide rail are connected with the two ends of the guide rail at two ends.

[0010] The suspension body includes a suspension plate, a connecting rod, and a bite plate, wherein two ends of the connecting rod are fixedly connected to the suspension plate and the bite plate respectively, and a connecting hole is provided on the bite plate; the lower surface of the suspension plate is a rough surface, and the lower surface of the suspension plate is in close contact and bite with the upper surface of the turntable to connect the suspension body and the contact body; the corresponding connecting parts are installed in the connecting hole to connect the suspension body and the arch foot of the upper step corrugated plate; the side of the suspension plate close to the upper step corrugated plate is hooked by the bent hook of the limit hook to limit the movement of the suspension plate deviating from the turntable.

[0011] The supporting top arch rod located in the middle is connected to the supporting cross beams located at the front and rear sides through cables to strengthen the external load supporting strength of the supporting cross beams.

[0012] The height of the supporting top arch rod is lower than the height of the tunnel roof.

[0013] A notch is provided on the top of the track plate, and a clamping plate and a clamping slot matched with the clamping plate are respectively provided at both ends of the track plate, and a limit rod and a flippable limit plate are respectively provided at both ends of the side of the track plate, and the limit plate is connected to the track plate through a rotating shaft, and a limit groove matched with the limit rod is provided on the top of the limit plate; the track plate can be lengthened by inserting the clamping plate on one track plate into the clamping slot on another track plate; the track plate can be fixed by flipping the limit plate on one track plate so that the limit groove on the limit plate opens downward and the limit groove matches with the limit rod on the other track plate.

[0014] The invention has the advantages of simple construction method and realization of supporting the arch foot of the upper step corrugated plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural diagram of the support structure of the present invention;

[0016] Figure 2 It is a structural diagram of the contact body in the present invention;

[0017] Figure 3 It is a structural diagram of the suspension body in the present invention;

[0018] Figure 4 It is a schematic diagram of the connection between the suspension body and the upper step corrugated plate in the present invention;

[0019] Figure 5 It is a structural diagram of the track plate in the present invention;

[0020] Figure 6 It is a connection schematic diagram of the track plate in the present invention. DETAILED DESCRIPTION

[0021] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0022] like Figure 1-6As shown in the figure, marks 1-25 respectively represent: lower step supporting column 1, middle step supporting column 2, column roller 3, track plate 4, supporting top arch rod 5, supporting cross beam 6, cable 7, diagonal arm 8, turntable 9, guide rod 10, contact body 11, limiting ring 12, limiting hook 13, upper step corrugated plate 14, cantilever plate 15, connecting rod 16, bite plate 17, connecting hole 18, notch 19, clamping plate 20, clamping slot 21, limiting rod 22, limiting slot 23, limiting plate 24, rotating shaft 25.

[0023] Example: Figure 1-6 As shown, this embodiment relates to a construction method of a temporary supporting structure of a corrugated plate for a traveling tunnel, and the construction method comprises the following steps:

[0024] (S1) Figure 4 As shown, while the tunnel upper step excavation construction is being carried out, the suspension body is pre-connected to the fixed position at the arch foot of the upper step corrugated plate 14. After the upper step construction is completed, the upper step corrugated plate 14 is installed to the fixed position.

[0025] (S2) Figure 1 As shown, a track plate 4 is laid and a support structure is installed on the track plate 4. The track plate 4 includes a first track plate and a second track plate. The first track plate is installed on the base of the middle step, and the second track plate is installed on the base of the lower step or the tunnel floor. The support structure includes a supporting top arch rod 5, a middle step supporting column 2, a lower step supporting column 1, a supporting crossbeam 6 and a contact body 11. The supporting top arch rod 5 is arranged horizontally and three are arranged at intervals along the longitudinal direction. The ends of the middle supporting top arch rod 5 and the rear supporting top arch rod 5 are respectively connected to the middle step supporting column 2 and the lower step supporting column 1. The lower step supporting column 2 is supported on the second track plate by the column roller 3 at the bottom thereof, and the middle step supporting column 1 is supported on the first track plate by the column roller 3 at the bottom thereof. The lower step supporting column 1 and the middle step supporting column 2 can move along the length direction of the corresponding track plate 4. The supporting top arch rods 5 are connected by supporting crossbeams 6, and the supporting crossbeams 6 are provided with a plurality of contact bodies 11 at intervals along the length direction thereof.

[0026] like Figure 1 and Figure 2As shown, the contact body 11 is located outside the supporting crossbeam 6, and the contact body 11 includes a guide rod 10, a turntable 9, two inclined rod arms 8, a limit ring 12, and a limit hook 13. One end of the two inclined rod arms 8 is connected to the supporting crossbeam 6, and the other end is connected to the two ends of the guide rod 10 respectively. The guide rod 10 is vertically arranged, and blocks are arranged at both ends of the guide rod 10. The turntable 9 is threadedly connected to the guide rod 10 and can move along the length direction of the guide rod 10 by rotating. The upper surface of the turntable 9 is a rough surface, and the upper surface of the turntable 9 supports the suspension body. By adjusting the height of the turntable 9 on the guide rod 10, the suspension body of different heights can be supported. The limit ring 12 is hooped on the guide rod 10 and the limit ring 12 can move along the length direction of the guide rod 10. The limit hook 13 is hinged with the limit ring 12, and the suspension body is hooked by the bend of the limit hook 13 to limit the movement of the suspension body deviating from the turntable 9.

[0027] like Figure 3 As shown, the suspension body includes a suspension plate 15, a connecting rod 16, and a bite plate 17. The two ends of the connecting rod 16 are fixedly connected to the suspension plate 15 and the bite plate 17 respectively. A connecting hole 18 (a bolt hole or a rivet hole in this embodiment) is opened on the bite plate 17; the lower surface of the suspension plate 15 is a rough surface, and the lower surface of the suspension plate 15 is tightly engaged with the upper surface of the turntable 9, so that the suspension body is supported on the contact body 11, and the supporting load can be evenly distributed on the supporting beam 6; by installing the corresponding connecting piece (a bolt or a rivet in this embodiment) in the connecting hole 18, the suspension body and the arch foot of the upper step corrugated plate 14 are connected. Since the length of the limit hook 13 is adapted to the width of the suspension plate 15, after the turntable 9 and the suspension plate 15 are in close contact and engagement, the positions of the limit ring 12 and the limit hook 13 are adjusted so that the bent hook of the limit hook 13 hooks the inner side of the suspension plate 15, that is, the side close to the upper step corrugated plate 14, to limit the movement of the suspension plate 15 away from the turntable 9.

[0028] like Figure 1 As shown, the middle supporting top arch rod 5 is connected to the two ends of the supporting cross beam 6 through the cable 7. The length of the cable 7 is adjustable to strengthen the external load supporting strength of the supporting cross beam 6, and the number of cables 7 can be adjusted according to actual conditions.

[0029] like Figure 1 As shown, the height of the supporting top arch rod 5 is slightly lower than the height of the tunnel roof in order to ensure sufficient construction space.

[0030] like Figure 5 and Figure 6As shown, a notch 19 is provided on the top of the track plate 4, and a clamping plate 20 and a clamping slot 21 matching with the clamping plate 20 are respectively provided at both ends of the track plate 4, and a limiting rod 22 and a flippable limiting plate 24 are respectively provided at both ends of the side of the track plate 4. The limiting plate 24 is connected to the track plate 4 through a rotating shaft 25, and a limiting slot 23 matching with the limiting rod 22 is provided on the top of the limiting plate 24; the track plate 4 is lengthened by inserting the clamping plate 20 on one track plate 4 into the clamping slot 21 on another track plate 4; the track plate 4 is fixed by flipping the limiting plate 24 on one track plate 4 so that the limiting slot 23 on the limiting plate 24 opens downward and the limiting slot 23 matches with the limiting rod 22 on the other track plate 4.

[0031] (S3) Push the support structure to move to a proper position, and connect the contact body 11 and the suspension body together to support the arch foot of the upper step corrugated plate 14. During construction, the length of the track plate 4 can be adjusted according to the length of the excavation step. The length of the track plate 4 is less than the length of the step. When the support structure is moved forward, the track plate 4 that has passed through the rear side is repeatedly moved forward to the front of the column roller 3 to lay the front track plate 4.

[0032] Among them, the cantilevered section of the supporting beam is used to support the cantilever body at the arch foot of the upper step corrugated plate and (or) part of the middle step corrugated plate at the same horizontal height as the cantilever body at the arch foot of the upper step corrugated plate, and the part other than the cantilevered section of the supporting beam is used to support the cantilever body of the middle step corrugated plate and (or) the lower step corrugated plate at the same horizontal height as the cantilever body at the arch foot of the upper step corrugated plate, so as to meet the force balance of the supporting beams on both sides of the middle step supporting column as much as possible.

[0033] In addition, by adjusting the height of the lower step support column 1 to make it the same height as the middle step support column 2, it can also be applied to the temporary support of the tunnel excavation support structure of the two-step method.

[0034] This embodiment also has the following beneficial effects: the construction method is simple, and the support for the arch foot of the upper step corrugated plate is achieved.

[0035] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A construction method for a temporary supporting structure of a corrugated plate for a traveling tunnel, characterized in that: The construction method comprises the following steps: (S1) After the construction of the upper step of the tunnel is completed, the upper step corrugated plate is installed to the corresponding position and the arch foot of the upper step corrugated plate is connected to the cantilever body; (S2) laying track plates and installing support structures on the track plates; wherein the track plates include a first track plate and a second track plate, the first track plate being installed on a base of a middle step, and the second track plate being installed on a base of a lower step or a tunnel floor; the support structure includes a support top arch rod, a middle step support column, a lower step support column, a support crossbeam and a contact body, the support top arch rod being arranged transversely and three of them being arranged at intervals in the longitudinal direction, the ends of the support top arch rod located in the middle and the end of the support top arch rod located in the rear being connected to the middle step support column and the lower step support column respectively, the lower step support column being slidably installed on the second track plate via a column roller at its bottom, and the middle step support column being slidably installed on the first track plate via a column roller at its bottom; the support top arch rods are connected via the support crossbeam and a plurality of the contact bodies are arranged at intervals along the length direction of the support crossbeam; (S3) Pushing the support structure to move to a proper position along the track plate, and connecting the contact body and the suspension body together to support the arch foot of the upper step corrugated plate.

2. The construction method of a temporary supporting structure of corrugated plate for a traveling tunnel as claimed in claim 1, characterized in that: The two ends of the guide rail are connected with the support rail at two ends, and the other ends of the guide rail are connected with the two ends of the guide rail at two ends.

3. The construction method of a temporary supporting structure of corrugated plate for a traveling tunnel as claimed in claim 2, characterized in that: The suspension body includes a suspension plate, a connecting rod, and a bite plate, wherein two ends of the connecting rod are fixedly connected to the suspension plate and the bite plate respectively, and a connecting hole is provided on the bite plate; the lower surface of the suspension plate is a rough surface, and the lower surface of the suspension plate is in close contact and bite with the upper surface of the turntable to connect the suspension body and the contact body; the corresponding connecting parts are installed in the connecting hole to connect the suspension body and the arch foot of the upper step corrugated plate; the side of the suspension plate close to the upper step corrugated plate is hooked by the bent hook of the limit hook to limit the movement of the suspension plate deviating from the turntable.

4. The construction method of a temporary supporting structure of corrugated plates for a traveling tunnel as claimed in claim 1, characterized in that: The supporting top arch rod located in the middle is connected to the supporting cross beams located at the front and rear sides through cables to strengthen the external load supporting strength of the supporting cross beams.

5. The construction method of a temporary supporting structure of corrugated plates for a traveling tunnel as claimed in claim 1, characterized in that: The height of the supporting top arch rod is lower than the height of the tunnel roof.

6. The construction method of a temporary supporting structure of corrugated plates for a traveling tunnel as claimed in claim 1, characterized in that: A notch is provided on the top of the track plate, and a clamping plate and a clamping slot matched with the clamping plate are respectively provided at both ends of the track plate, and a limit rod and a flippable limit plate are respectively provided at both ends of the side of the track plate, and the limit plate is connected to the track plate through a rotating shaft, and a limit groove matched with the limit rod is provided on the top of the limit plate; the track plate can be lengthened by inserting the clamping plate on one track plate into the clamping slot on another track plate; the track plate can be fixed by flipping the limit plate on one track plate so that the limit groove on the limit plate opens downward and the limit groove matches with the limit rod on the other track plate.

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