Secondary lining trolley pressure dispersion type longitudinal lap joint structure and working method

Abstract

The invention belongs to the technical field of tunnel secondary lining construction, and particularly relates to a secondary lining trolley pressure dispersion type longitudinal lap joint structure and a working method. According to the technical scheme, the pressure dispersion type longitudinal lap joint structure of the secondary lining trolley comprises the secondary lining trolley, a main formwork is connected to the secondary lining trolley, a C-shaped support is fixed to one side of the main formwork, a hydraulic bag body is arranged in the C-shaped support, and a pressure transmission assembly is arranged on the side, away from the C-shaped support, of the hydraulic bag body; the side, away from the hydraulic bag body, of the pressure transmission assembly is connected with an elastic gasket, a lap joint thin plate assembly is pressed between the formed second lining and the elastic gasket, and one end of the lap joint thin plate assembly is fixed to the main mold plate. The invention provides a secondary lining trolley pressure dispersion type longitudinal lap joint structure and a working method, and aims to solve the problems of slurry leakage, slab staggering and construction joint breakage caused by rigid lap joint between a secondary lining trolley template and a formed secondary lining, uncontrollable joint position and shape caused by air bag lap joint and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel secondary lining construction, and in particular relates to a secondary lining trolley pressure dispersion type longitudinal overlap structure and a working method. Background Art

[0002] During the construction of the secondary lining of the tunnel, the pumped concrete solidifies in the space between the secondary lining trolley and the primary lining to form the secondary lining. During the concrete pouring process, it is necessary to ensure that the secondary lining trolley and the surface of the formed secondary lining concrete form a sealing structure with a certain pressure, so as to ensure the formation of dense concrete and avoid quality problems such as honeycombs, rough surfaces, and looseness. However, the overlap between the secondary lining trolley and the formed secondary lining is prone to being fractured by the trolley, which brings great safety hazards to the later operation of the tunnel.

[0003] The existing overlap methods of the formed secondary lining and the rear of the secondary lining trolley include two types: setting a layer of buffer material at the rear of the main formwork (patent number CN202222574214.2) and setting a high-pressure airbag on the side of the main formwork to directly contact and seal with the formed secondary lining (authorization announcement number CN108952767B). The method of setting the buffer material can partially reduce the risk of fracturing. However, considering that the front and rear ends of the main formwork of the secondary lining trolley are not completely consistent, the sealing effect that can be provided by this buffer layer is very limited. The use of flexible airbag sealing overlap method cannot guarantee that the newly poured concrete at the overlap position can form the preset secondary lining surface shape, and secondary processing is required. The quality risk and cost risk of the secondary processing should not be ignored. Therefore, the industry, especially the field of high-speed passenger railway tunnel construction, is in urgent need of a device and construction method that can solve the problem of buffer sealing at the rear overlap of the secondary lining trolley. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a pressure-distributed longitudinal overlap structure and a working method for a second lining trolley, so as to solve the problems of leakage, misalignment and rupture of construction joints caused by rigid overlap between the second lining trolley template and the formed second lining, as well as uncontrollable joint position and shape caused by airbag overlap.

[0005] The technical solution adopted by the present invention is:

[0006] A secondary lining trolley pressure-distributed longitudinal overlap structure comprises a secondary lining trolley, a main template is connected to the secondary lining trolley, a C-shaped bracket is fixed on one side of the main template, a hydraulic bladder is arranged in the C-shaped bracket, a pressure transmission component is arranged on the side of the hydraulic bladder away from the C-shaped bracket, an elastic gasket is connected to the side of the pressure transmission component away from the hydraulic bladder, an overlap thin plate component is pressed between the formed secondary lining and the elastic gasket, and one end of the overlap thin plate component is fixed on the main template.

[0007] The C-shaped bracket set at the edge of the main template at the rear of the secondary lining trolley is used to provide support and deformation constraint for the hydraulic bladder. The hydraulic bladder set in the C-shaped bracket is used to provide a force perpendicular to the inner surface of the formed secondary lining. The pressure transmission component set on the side of the hydraulic bladder close to the formed secondary lining transmits the force provided by the hydraulic bladder to the elastic gasket in a dispersed manner. The elastic gasket set on the side of the pressure transmission component close to the surface of the formed secondary lining, under the uniform extrusion of the pressure transmission component, the elastic gasket and the formed secondary lining form a reliable local seal. The overlapping thin plate component fixed to the rear of the main template of the secondary lining trolley and working between the formed secondary lining and the elastic gasket is used to provide support in the gap between the elastic gasket and the main template to avoid leakage.

[0008] The present invention uses a hydraulic bladder to provide radial pressure along the tunnel to the pressure transmission assembly, and uses the pressure transmission assembly to transmit the radial pressure to the elastic gasket, so that the elastic gasket is in close contact with the formed secondary lining through the overlapping thin sheet, and plays a good sealing role. At the same time, the rigidity of the pressure transmission assembly can keep the newly cast secondary lining at the overlapping part with a preset shape. By setting the overlapping thin sheet assembly, the gap between the main template of the secondary lining trolley and the elastic gasket can be well supported, thereby avoiding the problems of the traditional gasket overlapping method easily crushing the formed secondary lining and the high-pressure airbag method being difficult to ensure the shape of the newly cast secondary lining.

[0009] As a preferred solution of the present invention, the pressure transmission assembly includes a plurality of pressure transmission members arranged in a C-shape. The plurality of pressure transmission members can better fit the inner surface of the formed second liner locally, thereby transmitting the force provided by the hydraulic bladder to the elastic gasket in a dispersed manner.

[0010] As a preferred solution of the present invention, the C-shaped bracket is provided with a first groove with an arc-shaped cross section on one side facing the hydraulic bladder, and one side of the hydraulic bladder fits in the first groove. The first groove can fit reliably with one side of the hydraulic bladder, so that the force can be transmitted more evenly through the hydraulic bladder.

[0011] As a preferred solution of the present invention, the two sides of the C-shaped bracket are provided with guide edges, the pressure transmission component is provided with a limit convex block, and the limit convex block is arranged between the two guide edges of the C-shaped bracket. The two guide edges of the C-shaped bracket always guide the limit convex block on the pressure transmission component to avoid the pressure transmission component and the hydraulic bladder from being misaligned under the extrusion of the hydraulic bladder.

[0012] As a preferred solution of the present invention, the side of the limiting protrusion facing the hydraulic bladder is provided with a second groove with an arc-shaped cross section, and one side of the hydraulic bladder fits in the second groove. The second groove can reliably fit with the side of the hydraulic bladder away from the C-shaped bracket, so that the force can be transmitted more evenly through the hydraulic bladder.

[0013] As a preferred solution of the present invention, the elastic gasket is provided with a boss, which is pressed tightly against the overlapping thin plate assembly. The at least two bosses provided on the elastic gasket can effectively improve the sealing effect of the local boss.

[0014] As a preferred solution of the present invention, a plurality of hydraulic struts are installed on the secondary lining trolley, and the piston rods of the plurality of hydraulic struts are connected to the main formwork. The main formwork is moved by the hydraulic struts to accurately move the main formwork to the position of the newly cast secondary lining.

[0015] As a preferred solution of the present invention, the overlapping thin plate assembly includes a plurality of overlapping thin plates arranged in a C shape, one end of the plurality of overlapping thin plates is fixed to the main template, and there is a gap between adjacent overlapping thin plates.

[0016] As a preferred solution of the present invention, a hydraulic interface is provided on one end of the hydraulic bladder, the hydraulic interface is connected to a hydraulic pipeline, and the other end of the hydraulic pipeline is connected to a hydraulic pump. A hydraulic interface is provided on at least one end of the hydraulic bladder, the hydraulic interface is connected to a hydraulic pump through a hydraulic pipeline, and the hydraulic pump provides expansion pressure for the hydraulic bladder.

[0017] A working method of a secondary lining trolley pressure distribution type longitudinal overlap structure comprises the following steps:

[0018] S1: Release the pressure of the hydraulic bladder so that the edge of the elastic gasket does not exceed the outer edge of the main template on the secondary lining trolley;

[0019] S2: Move the secondary lining trolley to the predetermined position, and adjust the hydraulic support rods so that the outer edge of the main template gradually approaches the curved surface where the inner wall of the formed secondary lining is located;

[0020] S3: Pump hydraulic oil into the hydraulic bladder to squeeze the elastic gasket against the formed secondary lining. After the hydraulic pressure reaches the preset value, it is maintained until the newly cast secondary lining is cast and reaches the demoulding strength.

[0021] S4: Release the hydraulic pressure inside the hydraulic bladder, adjust the position of the main template, move the secondary lining trolley longitudinally to a new predetermined position, and start the next working cycle.

[0022] The beneficial effects of the present invention are:

[0023] The present invention uses a hydraulic bladder to provide radial pressure along the tunnel to the pressure transmission component, and uses the pressure transmission component to transmit the radial pressure to the elastic gasket, so that the elastic gasket is in close contact with the formed secondary lining through the overlapping thin sheet, and plays a good sealing role. At the same time, the rigidity of the pressure transmission component can keep the newly cast secondary lining at the overlapping part with a preset shape. By setting the overlapping thin sheet, the gap between the main template of the secondary lining trolley and the elastic gasket can be well supported, thereby avoiding the problems of the traditional gasket overlapping method easily crushing the formed secondary lining and the high-pressure airbag method being difficult to ensure the shape of the newly cast secondary lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is a right side view of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the hydraulic bladder;

[0028] Figure 5 is a schematic diagram of the structure of the pressure transmission component;

[0029] Figure 6 It is a schematic diagram of the assembly structure of the pressure transmission component and the elastic gasket.

[0030] In the figure: 1-formed secondary lining; 2-newly cast secondary lining; 3-secondary lining trolley; 4-main formwork; 5-C-type bracket; 6-hydraulic bladder; 7-pressure transmission assembly; 8-elastic gasket; 9-overlapping thin plate; 31-hydraulic support rod; 51-first groove; 52-guide edge; 61-hydraulic interface; 62-hydraulic pipeline; 63-hydraulic pump; 71-pressure transmission member; 72-limiting protrusion; 73-second groove; 81-boss. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0033] like Figure 1 to Figure 3 As shown, the pressure-distributed longitudinal overlap structure of the second lining trolley of this embodiment includes a second lining trolley 3, to which a main template 4 is connected, a C-shaped bracket 5 is fixed on one side of the main template 4, a hydraulic bladder 6 is arranged in the C-shaped bracket 5, a pressure transmission component 7 is arranged on the side of the hydraulic bladder 6 away from the C-shaped bracket 5, an elastic gasket 8 is connected to the side of the pressure transmission component 7 away from the hydraulic bladder 6, an overlap thin plate component is pressed between the formed second lining 1 and the elastic gasket 8, and one end of the overlap thin plate component is fixed on the main template 4.

[0034] The C-shaped bracket 5 arranged at the edge of the main template 4 at the rear of the secondary lining trolley 3 is used to provide support and deformation constraint for the hydraulic bladder 6. The C-shaped bracket 5 is arranged in a ring along the end side of the main template 4, and the outer edge of the orthographic projection of the C-shaped bracket 5 on the plane perpendicular to the axis of the secondary lining trolley 3 does not exceed the outer edge of the orthographic projection of the main template 4 of the secondary lining trolley 3 on the same plane.

[0035] The hydraulic bag 6 disposed in the C-shaped bracket 5 is used to provide a force perpendicular to the inner surface of the formed secondary liner 1 .

[0036] The pressure transmission component 7 disposed on the hydraulic bladder 6 close to the formed secondary liner 1 transmits the force provided by the hydraulic bladder 6 to the elastic gasket 8 in a dispersed manner.

[0037] The elastic gasket 8 is arranged on the surface side of the pressure transmission component 7 close to the formed second lining 1. Under the uniform extrusion of the pressure transmission component 7, the elastic gasket 8 and the formed second lining 1 form a reliable local seal.

[0038] The overlapping thin plate assembly fixed to the tail of the main template 4 of the secondary lining trolley 3 works between the formed secondary lining 1 and the elastic gasket 8 to provide support for the gap between the elastic gasket 8 and the main template 4, thereby avoiding leakage of slurry.

[0039] The present invention uses the hydraulic bladder 6 to provide radial pressure along the tunnel to the pressure transmission component 7, and uses the pressure transmission component 7 to transmit the radial pressure to the elastic gasket 8, so that the elastic gasket 8 is in close contact with the formed secondary lining 1 through the overlapping thin sheet, and plays a good sealing role. At the same time, the rigidity of the pressure transmission component 7 can keep the newly cast secondary lining 2 at the overlapping part with a preset shape. By setting the overlapping thin sheet, the gap between the main template 4 of the secondary lining trolley 3 and the elastic gasket 8 can be well supported, thereby avoiding the problems that the traditional gasket overlapping method is easy to crush the formed secondary lining 1 and the high-pressure airbag method is difficult to ensure the shape of the newly cast secondary lining 2.

[0040] like Figure 5 and Figure 6 As shown, the pressure transmission assembly 7 includes a plurality of pressure transmission members 71, and the plurality of pressure transmission members 71 are arranged in a C-shape. The surface of the pressure transmission member 71 in contact with the hydraulic bladder 6 is a non-planar surface. The plurality of pressure transmission members 71 can better fit the inner surface of the formed secondary liner 1 locally, thereby transmitting the force provided by the hydraulic bladder 6 to the elastic gasket 8 in a dispersed manner.

[0041] like Figure 2 As shown, the C-shaped bracket 5 is provided with a first groove 51 with an arc-shaped cross section on one side facing the hydraulic bladder 6, and one side of the hydraulic bladder 6 fits in the first groove 51. The first groove 51 can fit reliably with one side of the hydraulic bladder 6, so that the force can be transmitted more evenly through the hydraulic bladder 6.

[0042] The C-shaped bracket 5 is provided with guide edges 52 on both sides, and the pressure transmission component 7 is provided with a limiting protrusion 72, which is arranged between the two guide edges 52 of the C-shaped bracket 5. The two guide edges 52 of the C-shaped bracket 5 always guide the limiting protrusion 72 on the pressure transmission component 7 to avoid the pressure transmission component 7 and the hydraulic bladder 6 being misaligned under the extrusion of the hydraulic bladder 6.

[0043] The side of the limiting protrusion 72 facing the hydraulic bladder 6 is provided with a second groove 73 with an arc-shaped cross section, and one side of the hydraulic bladder 6 fits in the second groove 73. The second groove 73 can reliably fit with the side of the hydraulic bladder 6 away from the C-shaped bracket 5, so that the force can be transmitted more evenly through the hydraulic bladder 6.

[0044] The elastic gasket 8 is provided with a boss 81, which is pressed against the overlapped thin plate assembly. The elastic gasket 8 is provided with at least two continuous bosses 81 along the length direction of the C-shaped hydraulic bladder 6, and the center spacing of the continuous bosses 81 is not less than 1 cm, which can effectively improve the local sealing effect of the bosses 81.

[0045] The overlapping thin plate assembly includes a plurality of overlapping thin plates 9 arranged in a C shape, one end of each overlapping thin plate 9 is fixed to the main template 4, and there is a gap between adjacent overlapping thin plates 9 to facilitate a certain displacement and avoid mutual interference. One end of the overlapping thin plate 9 is connected to the side end of the main template 4, and the other end of the overlapping thin plate 9 is located on a side surface of the elastic gasket 8 provided with a boss 81.

[0046] like Figure 1 As shown, a plurality of hydraulic struts 31 are installed on the secondary lining trolley 3, and the piston rods of the plurality of hydraulic struts 31 are connected to the main formwork 4. The main formwork 4 is moved by controlling the hydraulic struts 31, so that the main formwork 4 can be accurately moved to the position of the newly cast secondary lining 2.

[0047] like Figure 4 As shown, a hydraulic interface 61 is provided at one end of the hydraulic bladder 6, and the hydraulic interface 61 is connected to a hydraulic pipeline 62, and the other end of the hydraulic pipeline 62 is connected to a hydraulic pump 63. The hydraulic interface 61 is provided at least on one end of the hydraulic bladder 6, and the hydraulic interface 61 is connected to the hydraulic pump 63 through the hydraulic pipeline 62, and the hydraulic pump 63 provides expansion pressure for the hydraulic bladder 6. The hydraulic bladder 6 is in the shape of a long strip, and the cross section of the hydraulic bladder 6 can be deformed under different hydraulic pressures, and the longitudinal deformation of the hydraulic bladder 6 under different hydraulic pressures does not exceed 1 / 100 of the total length.

[0048] It should be noted that: ideally, it must be ensured that the formed secondary lining 1 and the main formwork 4 are not in contact, so as to avoid the main formwork 4 from crushing the formed secondary lining 1. Therefore, the pressure transmission assembly 7 and the C-shaped bracket 5 are not completely located on the inner side of the formed secondary lining 1, but a part of them extends to the inner area of ​​the newly cast secondary lining 2.

[0049] The working method of the secondary lining trolley pressure distribution type longitudinal overlap structure of this embodiment comprises the following steps:

[0050] S1: Release the pressure of the hydraulic bladder 6 so that the edge of the elastic gasket 8 does not exceed the outer edge of the main template 4 on the secondary lining trolley 3; so that no interference occurs during the process of moving the main template 4 to the next template position, and the observation position is not affected;

[0051] S2: Move the secondary lining trolley 3 to a predetermined position, and adjust the hydraulic support rod 31 so that the outer edge of the main template 4 gradually approaches the curved surface where the inner wall of the formed secondary lining 1 is located, and the panel of the main template 4 does not contact the inner surface of the formed secondary lining 1;

[0052] S3: Fix the main template 4 of the secondary lining trolley 3, pump hydraulic oil into the hydraulic bag 6, so that the elastic gasket 8 squeezes the formed secondary lining 1, and the hydraulic pressure reaches the preset value and is maintained until the new secondary lining 2 is cast and reaches the demoulding strength;

[0053] S4: Release the internal hydraulic pressure of the hydraulic bladder 6, adjust the position of the main template 4, move the secondary lining trolley 3 longitudinally to a new predetermined position, and start the next working cycle.

[0054] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A pressure-distributed longitudinal lap joint structure for a secondary lining trolley, characterized in that: The invention comprises a secondary lining trolley (3), the secondary lining trolley (3) is connected to a main template (4), a C-shaped bracket (5) is fixed to one side of the main template (4), a hydraulic sac (6) is arranged in the C-shaped bracket (5), a pressure transmission component (7) is arranged on the side of the hydraulic sac (6) away from the C-shaped bracket (5), an elastic gasket (8) is connected to the side of the pressure transmission component (7) away from the hydraulic sac (6), a lapped thin plate component is pressed between the formed secondary lining (1) and the elastic gasket (8), and one end of the lapped thin plate component is fixed to the main template (4).

2. According to claim 1, a secondary lining trolley pressure distribution type longitudinal overlap structure is characterized by: The pressure transmission assembly (7) comprises a plurality of pressure transmission components (71), and the plurality of pressure transmission components (71) are arranged in a C shape.

3. The pressure-distributed longitudinal overlap structure of the secondary lining trolley according to claim 1 is characterized in that: A first groove (51) with an arc-shaped cross section is provided on the side of the C-shaped bracket (5) facing the hydraulic bladder (6), and one side of the hydraulic bladder (6) fits in the first groove (51).

4. The pressure-distributed longitudinal overlap structure of the secondary lining trolley according to claim 1 is characterized in that: The C-shaped bracket (5) is provided with guide edges (52) on both sides, and the pressure transmission component (7) is provided with a limiting protrusion (72), and the limiting protrusion (72) is arranged between the two guide edges (52) of the C-shaped bracket (5).

5. The pressure-distributed longitudinal overlap structure of the secondary lining trolley according to claim 4 is characterized in that: A second groove (73) with an arc-shaped cross section is provided on the side of the limiting protrusion (72) facing the hydraulic bladder (6), and one side of the hydraulic bladder (6) fits in the second groove (73).

6. The secondary lining trolley pressure distribution type longitudinal overlap structure according to claim 1, characterized in that: The elastic gasket (8) is provided with a boss (81), and the boss (81) is pressed tightly against the overlapping thin plate assembly.

7. The secondary lining trolley pressure distribution type longitudinal overlap structure according to claim 1, characterized in that: A plurality of hydraulic support rods (31) are installed on the secondary lining trolley (3), and piston rods of the plurality of hydraulic support rods (31) are connected to the main template (4).

8. The secondary lining trolley pressure distribution type longitudinal overlap structure according to claim 1, characterized in that: The overlapping thin plate assembly comprises a plurality of overlapping thin plates (9) arranged in a C shape, one end of each of the overlapping thin plates (9) is fixed on the main template (4), and there is a gap between adjacent overlapping thin plates (9).

9. The secondary lining trolley pressure distribution type longitudinal overlap structure according to claim 1, characterized in that: A hydraulic interface (61) is provided at one end of the hydraulic bag (6), the hydraulic interface (61) is connected to a hydraulic pipeline (62), and the other end of the hydraulic pipeline (62) is connected to a hydraulic pump (63).

10. A working method of a secondary lining trolley pressure distribution type longitudinal overlap structure, using the secondary lining trolley pressure distribution type longitudinal overlap structure of claim 1, characterized in that: The following steps are involved: S1: releasing the pressure of the hydraulic bag (6) so that the edge of the elastic gasket (8) does not exceed the outer edge of the main template (4) on the secondary lining trolley (3); S2: moving the secondary lining trolley (3) to a predetermined position, and adjusting the hydraulic support rod (31) so that the outer edge of the main template (4) gradually approaches the curved surface where the inner wall of the formed secondary lining (1) is located; S3: Pumping hydraulic oil into the hydraulic bladder (6) to squeeze the elastic gasket (8) against the formed second lining (1). After the hydraulic pressure reaches a preset value, it is maintained until the newly cast second lining (2) is cast and reaches the demoulding strength; S4: Release the internal hydraulic pressure of the hydraulic bladder (6), adjust the position of the main template (4), and move the secondary lining trolley (3) longitudinally to a new predetermined position to start the next working cycle.

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