A long-distance tunnel full-circle double-lining invert construction template system and template transfer method

Abstract

The present invention discloses a long-distance tunnel full-circle secondary lining invert construction template system and template transfer method. The template system includes a customized steel template, a steel pipe support and a basket bolt. The steel pipe support is arranged between the longitudinal main rib and the longitudinal track and the primary lining to support the vertical buoyancy. The basket bolt is arranged between the two sides of the template and the reserved steel bars to resist the horizontal load generated during asymmetric pouring. The template transfer is implemented by a cantilever gantry crane and a transport flatbed truck. The travel tracks of the cantilever gantry crane and the transport flatbed truck are integrated on the customized steel template, and there is no need to lay tracks separately. The template system described in the present invention has high strength and high rigidity, a simple template system, and a simple template transfer method. It has high work efficiency, can improve the construction efficiency of the long-distance full-circle tunnel secondary lining invert, and save construction time.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a long-distance tunnel full-circle double-lining invert construction template system and a template transportation method. Background Art

[0002] With the needs of social development and the advancement of construction technology, long-distance full-circle tunnels are increasing. In the construction of the secondary lining invert of a long-distance full-circle tunnel, a small formwork splicing method is adopted. The formwork system is complex, the workload of formwork transportation is large, the manpower input is large, the quality is difficult to control, and the roundness is poor. The invert trolley is used for construction, but the single construction length is limited, and the equipment cost is high, which is not conducive to large-scale investment. Summary of the invention

[0003] In order to overcome the technical defects in the prior art of long-distance full-circle tunnel secondary lining invert construction, such as large workload for template transportation, large number of personnel involved, and difficult quality control, the present invention provides a long-distance tunnel full-circle secondary lining invert construction template system and template transportation method, which solves the above technical problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: a long-distance tunnel full-circle double-lining invert construction formwork system, including a customized steel formwork, steel pipe supports and basket bolts. The steel pipe supports are arranged on the longitudinal main ribs and between the longitudinal rails and the primary lining to support the vertical buoyancy. The basket bolts are arranged between the two sides of the formwork and the reserved steel bars to resist the horizontal load generated during asymmetric pouring.

[0005] The customized steel mold consists of a panel, a flange, an annular secondary rib, a longitudinal main rib, a longitudinal track, an oblique support system and a cover plate. The flange, annular secondary rib and longitudinal main rib are welded to the panel and bear the force together. The longitudinal track is installed on the annular secondary rib, and the end face is flush with the flange. The ring width of the panel is smaller than the net spacing between the two sets of longitudinal tracks integrated on the customized steel mold, and also smaller than the clearance between the columns on both sides of the cantilever gantry. The oblique support system consists of a fixed seat plate, an adjustable pin barrel, an oblique support rod and a limit pin shaft. A through hole is set in the middle of the fixed seat plate and the internal thread is turned. The adjustable pin barrel is turned into a matching external thread and screwed into the fixed seat In the through hole of the plate, the support length of the oblique strut is adjusted by a thread. The oblique strut is a steel pipe, a sealing steel plate is arranged at the bottom, and a pull ring is arranged at the top. The adjustable pin barrel is provided with a limit hole, and the oblique strut is provided with two limit holes. Before pouring concrete, the top limit hole of the oblique strut is aligned with the limit hole of the adjustable pin barrel, and locked with a limit pin shaft to support the deadweight of the formwork. After the concrete pouring is completed, the limit pin shaft is pulled out and the bottom limit hole of the oblique strut is aligned with the limit hole of the adjustable pin barrel, and locked with a limit pin shaft as the formwork surface. The cover plate is located on the annular secondary rib to prevent the concrete from contaminating the formwork during the pouring process.

[0006] The present invention also provides a template transfer method for long-distance tunnel full-circle double lining invert construction, the template transfer is implemented by a cantilever gantry crane and a transport flatbed truck, the travel tracks of the cantilever gantry crane and the transport flatbed truck are integrated on the customized steel template, and there is no need to lay tracks separately. The template transfer method includes the following construction steps:

[0007] S1: Install a cantilever gantry crane at the entrance of the cave, and hang a customized steel mold on the cantilever at one end outside the cave and rotate it 90°;

[0008] S2: Start the longitudinal hoist, transport the template through the cantilever door hanging column to the cantilever in the hole, and rotate the template 90°;

[0009] S3: The cantilever in the hole lowers the template, and at the same time, the oblique support rod passes through the template to provide support, ensuring that the integrated longitudinal track of the template is aligned with the track of the cantilever gantry crane;

[0010] S4: Repeat the above template transfer steps, install the second template, and connect the flanges of the two templates;

[0011] S5: Repeat the above steps to complete the installation of the remaining templates. When there are a large number of templates, a transport flatbed truck can be used to improve efficiency;

[0012] S6: Use steel pipe support and basket bolts to reinforce the formwork and pour concrete. After the concrete pouring is completed, immediately withdraw the diagonal support rods to the formwork surface for maintenance;

[0013] S7: Remove the steel pipe support and turnbuckle bolts, and install the second cantilever gantry crane at the opening;

[0014] S8: The cantilever at the opening lifts the first installed formwork and rotates it 90°, starts the longitudinal hoist, transports the formwork through the cantilever door hanging column to the other end of the cantilever, rotates the formwork 90°, and lowers it onto the formwork transport flatbed truck;

[0015] S9: The template transport flatbed truck moves to another cantilever crane, lifts the template from one end of the cantilever and rotates it 90°, starts the longitudinal movement hoist, transports the template through the cantilever crane column to the other end of the cantilever and rotates the template 90°, and lowers the template to complete the transportation and installation;

[0016] S10: Repeat steps S8 and S9 to complete the transfer of the remaining formwork, install support reinforcement, and pour concrete.

[0017] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0018] 1. The present invention provides a long-distance tunnel full-circle double-lining invert construction template system and template transfer method, the template has high strength and rigidity, the template system is simple, and the degree of mechanization is high, which can reduce labor intensity, save labor input, and reduce labor costs. The template is annularly integral, has no longitudinal joints, is circumferentially flanged, has high flatness, no misalignment, and has good invert forming quality;

[0019] 2. The present invention provides a method for transporting templates for construction of a full-circle double-lining invert arch of a long-distance tunnel. The method has simple operation and high work efficiency, can improve the construction efficiency of the full-circle double-lining invert arch of a long-distance tunnel, and save construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 It is a schematic diagram of the overall structure of a long-distance tunnel full-circle double-lining invert construction template system of the present invention;

[0022] Figure 2 for Figure 1 Schematic cross-section of

[0023] Figure 3 It is a schematic diagram of the design of the template system of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the template of the present invention;

[0025] Figure 5 This is a schematic diagram of the template transport process of the present invention;

[0026] Figure 6 This is a schematic diagram of the template transfer and rotation process of the present invention;

[0027] In the figure: 1-customized steel formwork, 2-cantilever gantry crane, 3-transport flatbed truck, 4-cast inverted arch, 5-inverted arch to be cast, 6-primary lining, 7-steel pipe support, 8-basket bolts, 9-secondary lining steel bars, 101-panel, 102-flange, 103-longitudinal track, 104-diagonal support system, 105-cover plate. DETAILED DESCRIPTION

[0028] like Figures 1 to 3 As shown, it is a schematic diagram of the overall structure and a schematic diagram of the cross section of a formwork system for the construction of a full-circle double-lining invert arch of a long-distance tunnel. The formwork system includes a customized steel formwork 1, a steel pipe support 7 and a basket bolt 8. The steel pipe support 7 is arranged between the longitudinal main ribs and the longitudinal track and the primary lining 6 to support the vertical buoyancy. The basket bolt 8 is arranged between the two sides of the formwork and the reserved steel bars to resist the horizontal load generated during asymmetric pouring.

[0029] The customized steel mold 1 is composed of a panel 101, a flange 102, an annular secondary rib, a longitudinal main rib, a longitudinal track 103, an oblique support system 104 and a cover plate 105. Figure 4 As shown, the flange 102, the annular secondary rib and the longitudinal main rib are welded on the panel 101 and bear the force together. The longitudinal track 103 is installed on the annular secondary rib, and the end face is flush with the flange 102. The ring width of the panel 101 is smaller than the net spacing between the two sets of longitudinal tracks 103 integrated on the customized steel mold 1, and is also smaller than the clearance between the columns on both sides of the cantilever gantry crane 2. The cover plate 105 is located on the annular secondary rib to prevent the concrete from contaminating the template during the pouring process.

[0030] The oblique support system 104 consists of a fixed seat plate, an adjustable pin barrel, an oblique strut and a limit pin shaft. A through hole is set in the middle of the fixed seat plate and an internal thread is turned. The adjustable pin barrel is turned with a matching external thread and screwed into the through hole of the fixed seat plate. The support length of the oblique strut is adjusted by the thread. The oblique strut is a steel pipe with an end-sealing steel plate at the bottom and a pull ring at the top. The adjustable pin barrel is provided with a limit hole, and the oblique strut is provided with two limit holes. Before concrete pouring, the top limit hole of the oblique strut is aligned with the limit hole of the adjustable pin barrel and locked with a limit pin shaft to support the deadweight of the formwork. After the concrete pouring is completed, the limit pin shaft is pulled out and the bottom limit hole of the oblique strut is aligned with the limit hole of the adjustable pin barrel and locked with a limit pin shaft as the formwork surface.

[0031] The present invention also provides a template transfer method for long-distance tunnel full-circle double lining invert construction, the template transfer is implemented by a cantilever gantry crane 2 and a transport flatbed truck 3, the travel tracks of the cantilever gantry crane 2 and the transport flatbed truck 3 are integrated on the customized steel mold 1, and there is no need to lay tracks separately. The template transfer method includes the following construction steps:

[0032] Step 1: Install a cantilever gantry crane 2 at the hole entrance, and hang a customized steel mold 1 on the cantilever at one end outside the hole and rotate it 90°. Figure 5 and Figure 6 As shown;

[0033] Step 2: Start the longitudinal hoist, transport the template through the 2nd column of the cantilever door crane to the cantilever in the hole, and rotate the template 90°;

[0034] Step 3: The cantilever in the hole lowers the template, and at the same time, the oblique support rod is passed through the template to provide support, ensuring that the template integrated longitudinal track 103 is aligned with the track of the cantilever door crane 2;

[0035] Step 4: Repeat the above template transfer steps, install the second template, and connect the flanges 102 of the two templates;

[0036] Step 5: Repeat the above steps to complete the installation of the remaining templates. When the number of templates is large, a transport flatbed truck 3 can be used to improve efficiency;

[0037] Step 6: Use steel pipe support 7 and basket bolts 8 to reinforce the formwork and pour concrete. After the concrete pouring is completed, immediately withdraw the oblique support rods to the formwork surface for maintenance;

[0038] Step 7: Remove the steel pipe support 7 and the basket bolts 8, and install the second cantilever gantry crane 2 at the opening;

[0039] Step 8: The first installed template is lifted by the cantilever at the hole entrance and rotated 90°, the longitudinal hoist is started, the template is transported through the cantilever gantry 2 column to the other end of the cantilever and the template is rotated 90° and lowered onto the template transport flatbed trolley 3;

[0040] Step 9: The template transport flatbed truck 3 moves to another cantilever gantry crane 2, lifts the template from one end of the cantilever and rotates it 90°, starts the longitudinal movement hoist, transports the template through the cantilever gantry crane 2 column to the other end of the cantilever and rotates the template 90°, and lowers the template to complete the transportation and installation;

[0041] Step 10: Repeat steps 8 and 10 to complete the transfer of the remaining formwork, install support reinforcements, and pour concrete.

[0042] It will be easily understood by those skilled in the art that 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-distance tunnel full-circle double-lining invert construction formwork system, comprising a customized steel formwork (1), a steel pipe support (7) and a turnbuckle bolt (8), characterized in that: The customized steel mold (1) is composed of a panel (101), a flange (102), an annular secondary rib, a longitudinal main rib, a longitudinal track (103), an oblique support system (104) and a cover plate (105). The flange (102), the annular secondary rib and the longitudinal main rib are welded to the panel (101) and bear force together. The longitudinal track (103) is installed on the annular secondary rib, and the end face is flush with the flange (102). The ring width of the panel (101) is smaller than the net spacing between the two sets of longitudinal tracks (103) integrated on the customized steel mold (1), and is also smaller than the clearance between the columns on both sides of the cantilever gantry (2). The oblique support system (104) is composed of a fixed seat plate, an adjustable pin barrel, an oblique support rod and a limit pin shaft. A through hole is arranged in the middle of the fixed seat plate and an internal thread is formed. The adjustable pin barrel is formed with a matching external thread and screwed into the through hole of the fixed seat plate. The extension length of the oblique support rod is adjusted by the thread. The oblique support rod is a steel pipe, a sealing steel plate is arranged at the bottom, and a pull ring is arranged at the top. The adjustable pin barrel is provided with a limit hole, and the oblique support rod is provided with two limit holes. Before concrete pouring, the limit hole at the top of the oblique support rod is aligned with the limit hole of the adjustable pin barrel, and locked with a limit pin shaft to support the deadweight of the template. After the concrete pouring is completed, the limit pin shaft is pulled out and the limit hole at the bottom of the oblique support rod is aligned with the limit hole of the adjustable pin barrel, and locked with a limit pin shaft as the template surface. The cover plate (105) is located on the annular secondary ridge to prevent the concrete from contaminating the template during the pouring process; The steel pipe support (7) is arranged between the longitudinal main ribs and the longitudinal rails and the primary lining (6) to support the vertical buoyancy; The basket bolts (8) are arranged between the two sides of the template and the reserved steel bars to resist the horizontal load generated during asymmetric pouring.

2. A template transfer method for long-distance tunnel full-circle double-lining invert construction, characterized by: The template transfer is implemented by using a cantilever gantry crane (2) and a transport flatbed truck (3). The travel tracks of the cantilever gantry crane (2) and the transport flatbed truck (3) are integrated on the customized steel template, and there is no need to lay additional tracks. The template transfer method includes the following construction steps: S1: Install a cantilever gantry crane (2) at the entrance of the cave, and hang a customized steel mold (1) on the cantilever at one end outside the cave and rotate it 90°; S2: Start the longitudinal hoist to transport the template through the cantilever gantry crane (2) column to the cantilever in the hole, and rotate the template 90°; S3: The cantilever in the hole lowers the template, and at the same time, the oblique support rod is passed through the template to provide support, ensuring that the template integrated longitudinal track (103) is aligned with the track of the cantilever gantry crane (2); S4: Repeat the above template transfer steps, install the second template, and connect the flanges (102) of the two templates; S5: Repeat the above steps to complete the installation of the remaining templates. When the number of templates is large, a transport flatbed truck (3) can be used to improve efficiency. S6: Use steel pipe supports (7) and basket bolts (8) to reinforce the formwork and pour concrete. After the concrete pouring is completed, immediately withdraw the oblique support rods to the formwork surface for maintenance; S7: Remove the steel pipe support (7) and the turnbuckle bolts (8), and install the second cantilever gantry crane (2) at the opening; S8: The cantilever at the opening lifts the first installed formwork and rotates it 90°, starts the longitudinal transfer hoist, transports the formwork through the cantilever gantry (2) column to the other end of the cantilever, rotates the formwork 90°, and lowers it onto the formwork transport flatbed truck (3); S9: the template transport flatbed truck (3) moves to another cantilever gantry crane (2), lifts the template from one end of the cantilever and rotates it 90°, starts the longitudinal movement hoist, transports the template through the cantilever gantry crane (2) column to the other end of the cantilever and rotates the template 90°, and lowers the template to complete the transportation and installation; S10: Repeat steps S8 and S9 to complete the transfer of the remaining formwork, install support reinforcement, and pour concrete.

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