Standardized and rapid assembly construction method for tunnel secondary lining steel

Abstract

The application discloses a tunnel secondary lining steel bar standardization rapid assembly construction method. The application has two technical paths: technical path A processes five segmental assembly secondary lining steel bars outside a hole, realizes inward bending through movable hinges between segments, achieves overall reduction of the secondary lining steel bars, and finally pours secondary lining concrete through walking, jacking systems of the secondary lining steel bar assembly trolley, space dislocation of forward movement of the secondary lining trolley and re-retreat positioning. Technical path B lengthens a reserved height of a tunnel inverted arch steel bar, reduces the overall height of the secondary lining steel bars, processes secondary lining steel bar annular pieces outside the hole, realizes longitudinal transportation of the secondary lining steel bar annular pieces through walking, jacking and rotating systems of the secondary lining steel bar assembly trolley, 90-degree rotation, space dislocation of forward movement of the secondary lining trolley and re-retreat positioning, and finally pours secondary lining concrete. The two methods can realize standardization production of secondary lining steel bars outside the hole and transportation to the tunnel for installation.

Description

Technical Field

[0001] This invention relates to a construction method for tunnel secondary lining reinforcement, and more particularly to a standardized and rapid assembly construction method for tunnel secondary lining reinforcement. Background Technology

[0002] Currently, the main method for installing secondary lining reinforcement in tunnel engineering is manual bending and installation. Typically, at least seven workers are needed to place a single reinforcement bar in the designed spatial position. This method presents several problems: First, the labor required for binding the secondary reinforcement inside the tunnel is large, resulting in low efficiency and poor working conditions for workers. Second, reinforcement work takes up a significant portion of the entire secondary lining construction time, significantly impacting the overall tunnel construction schedule. Third, delays in secondary lining construction can lead to exceeding safety margin limits, forcing work to be suspended at the tunnel face. Fourth, manual on-site installation of secondary lining reinforcement results in non-standardized spacing, such as inconsistent layer spacing and reinforcement bar spacing, leading to poor standardized operation. Fifth, controlling the thickness of the secondary lining protective layer during on-site reinforcement binding can easily result in exposed reinforcement or excessively large protective layers, leading to quality defects. Summary of the Invention

[0003] The purpose of this invention is to provide a standardized and rapid assembly construction method for tunnel secondary lining reinforcement. This method achieves overall assembly construction of the tunnel secondary lining reinforcement by standardizing the fabrication of the reinforcement outside the tunnel, followed by bending and transporting it, or transporting it longitudinally in sections and then rotating it laterally, and by using techniques such as spatial misalignment of the secondary lining trolley. This method allows for centralized standardized processing of the secondary lining reinforcement outside the tunnel, significantly reducing the time spent by steelworkers binding the reinforcement inside the tunnel and improving the quality of standardized reinforcement processing; it enables rapid, standardized installation of the secondary lining reinforcement, greatly improving work efficiency; it revolutionizes the traditional secondary lining construction process by adopting standardized fabrication and transportation of the secondary lining reinforcement outside the tunnel and overall assembly installation inside the tunnel, completely replacing the original process of binding individual reinforcement pieces on-site inside the tunnel; it further improves the installation accuracy and standardization of the secondary lining reinforcement; it eliminates common quality problems such as exposed reinforcement or excessive protective layer, and improves the overall project quality.

[0004] The technical solution of this invention is a standardized and rapid assembly construction method for tunnel secondary lining steel bars. The secondary lining steel bars that need to be installed in pieces inside the tunnel are assembled as a whole outside the tunnel, and then transported to the tunnel by a secondary lining steel bar assembly trolley for overall assembly and installation with the pre-embedded steel bars of the invert arch. There are two specific technical methods for its implementation, namely technical path A and technical path B.

[0005] In the aforementioned standardized and rapid assembly construction method for tunnel secondary lining reinforcement, the technical path A involves processing the five-segment prefabricated secondary lining reinforcement (ABCDE) outside the tunnel. This is achieved by bending the segments inward to reduce the overall size of the five-segment prefabricated secondary lining reinforcement. Then, through the walking system and lifting system of the secondary lining reinforcement assembly trolley, as well as the forward movement, spatial misalignment, and retraction and positioning technology of the secondary lining trolley, the transportation, lifting, and secondary lining concrete pouring of the five-segment prefabricated secondary lining reinforcement (ABCDE) can be completed.

[0006] Technical path A specifically includes the following steps:

[0007] A1: An external steel reinforcement fabrication site is set up outside the tunnel, and a secondary lining steel reinforcement assembly trolley is set up on the external steel reinforcement fabrication site.

[0008] A2: Using the prefabricated secondary lining steel reinforcement trolley as the formwork, the prefabricated secondary lining steel reinforcement of five segments (ABCDE) is made on it. The overall direction of the prefabricated prefabricated secondary lining steel reinforcement of five segments (ABCDE) is the same as that of the tunnel. The prefabricated prefabricated secondary lining steel reinforcement of five segments (ABCDE) is folded between segments to reduce the overall size of the prefabricated secondary lining steel reinforcement of five segments (ABCDE).

[0009] A3: Move the secondary lining trolley forward toward the working face to the front of the pre-embedded steel bars of the invert arch;

[0010] A4: The five-section prefabricated secondary lining steel bars (ABCDE) are moved to the installation position inside the tunnel along with the secondary lining steel bar prefabrication trolley via the walking system.

[0011] A5: Unfold the five-segment prefabricated secondary lining steel bars (ABCDE) and restore them to their original shape before folding. Then, use the lifting system of the secondary lining steel bar prefabricated trolley to lift the five-segment prefabricated secondary lining steel bars to the design requirements position.

[0012] A6: Connect the five segments of prefabricated secondary lining steel bars (ABCDE) to the pre-embedded steel bars of the invert arch;

[0013] A7: The jacking system descends, causing the five-segment prefabricated secondary lining steel bars (ABCDE) to separate from the secondary lining steel bar prefabricated trolley, and then the secondary lining steel bar prefabricated trolley is moved out of the tunnel.

[0014] A8: The secondary lining trolley moves to its original position to complete the pouring of the secondary lining concrete.

[0015] In the aforementioned standardized and rapid assembly construction method for tunnel secondary lining reinforcement, technical path B involves processing the circumferential plates of secondary lining reinforcement outside the tunnel. By extending the height of the pre-embedded reinforcement in the invert arch, the overall height of the circumferential plates of secondary lining reinforcement can be reduced to meet the needs of passage. Then, through the walking system, rotating system, and lifting system of the secondary lining reinforcement assembly trolley, as well as the secondary lining trolley's forward movement, spatial misalignment, and retraction and positioning technology, the longitudinal transportation, 90° rotation, lifting, and secondary lining concrete pouring of the circumferential plates of secondary lining reinforcement can be completed.

[0016] Technical path B specifically includes the following steps:

[0017] B1: An external steel reinforcement fabrication site is set up outside the tunnel, and a secondary lining steel reinforcement assembly trolley is set up on the external steel reinforcement fabrication site.

[0018] B2: Using the secondary lining steel reinforcement assembly trolley as the formwork, the secondary lining steel reinforcement circumferential sheet is made on it. The overall direction of the secondary lining steel reinforcement circumferential sheet is perpendicular to the tunnel direction, and the longitudinal length of the secondary lining steel reinforcement circumferential sheet is 1 / 3 of the length of the secondary lining.

[0019] B3: Move the secondary lining trolley forward toward the working face to the front of the pre-embedded steel bars of the invert arch;

[0020] B4: Move the secondary lining steel circumferential sheet along with the secondary lining steel assembly trolley to the installation position inside the tunnel via the walking system;

[0021] B5: The secondary lining steel reinforcement circumferential sheet is lifted to the design height by the jacking system, and then the secondary lining steel reinforcement circumferential sheet is rotated 90° as a whole to be in the same direction as the tunnel by the rotation system on the top of the secondary lining steel reinforcement assembly trolley;

[0022] B6: Connect the circumferential reinforcement of the secondary lining to the pre-embedded reinforcement of the invert arch. When pre-embedding the pre-embedded reinforcement of the invert arch, the height of its extension above the ground should be increased.

[0023] B7: The lifting system descends, causing the circumferential sheet of the secondary lining steel to separate from the assembly trolley of the secondary lining steel, and then the assembly trolley of the secondary lining steel is moved out of the tunnel.

[0024] B8: Repeat steps B2 to B7 to complete the installation, transportation and connection of the remaining two secondary lining steel circumferential plates;

[0025] B9: The secondary lining trolley moves to its original position to complete the pouring of the secondary lining concrete.

[0026] In the aforementioned standardized and rapid assembly construction method for tunnel secondary lining reinforcement, the walking system can realize two walking modes: wheeled and rail. When the invert arch filling surface is relatively flat, wheeled walking is used; when it is uneven, rail walking can be selected. The two walking modes are switched as follows: when wheeled walking is switched to rail walking, the rail steel wheel is lifted out by the lifting system above the rail and placed on the walking rail. Then, it is lifted out again to make the walking rubber wheel suspended from the ground to complete the conversion from wheeled walking to rail walking. The reverse is also true.

[0027] In the aforementioned standardized rapid assembly construction method for tunnel secondary lining reinforcement, the ends of adjacent reinforcement segments in the five-segment prefabricated secondary lining reinforcement (ABCDE) are connected by movable hinges, and hand-operated hoists and telescopic jacks are installed on the columns on both sides of the secondary lining reinforcement assembly trolley. In step A2, by pulling the chain of the hand-operated hoist, the segments of the five-segment prefabricated secondary lining reinforcement (ABCDE) are bent inward around the movable hinges, thereby reducing the overall space of the five-segment prefabricated secondary lining reinforcement (ABCDE). In step A5, the chain of the hand-operated hoist is released, allowing the segments of the five-segment prefabricated secondary lining reinforcement (ABCDE) to unfold naturally under the action of gravity. For those segments that do not unfold properly, they are pushed into place by the telescopic jacks.

[0028] The beneficial effects of this invention are as follows: Compared with the prior art, the method of this invention changes the traditional construction process that requires the installation of secondary lining reinforcement in loose components inside the tunnel. Because the secondary lining reinforcement is encased within the secondary lining concrete, the installation space for the reinforcement must be larger than the tunnel's secondary lining clearance. The traditional approach considers it impractical to pre-assemble the secondary lining reinforcement outside the tunnel before transporting it inside for installation, due to two main problems: First, if the secondary lining reinforcement is pre-assembled outside the tunnel, the space it occupies is far greater than the internal clearance of the tunnel's secondary lining concrete, making it impossible to transport the reinforcement as a whole from outside to inside the tunnel. Second, even if the reinforcement can be transported into the tunnel using technical means, its installation position is in front of the secondary lining trolley used for pouring concrete, and the limited space beneath the trolley prevents the reinforcement from bypassing it and moving to its installation position.

[0029] The method of this invention utilizes two approaches: Approach A involves processing five-segment prefabricated secondary lining reinforcement outside the tunnel. This is achieved by using movable hinges between segments to bend the reinforcement inwards, reducing its overall size. The assembly process utilizes a trolley's traveling and lifting systems, as well as a trolley that moves forward, shifts to a more flexible position, and then retracts to its original position. Approach B reduces the overall height of the secondary lining reinforcement by extending the pre-reserved height of the tunnel invert reinforcement. This is achieved by processing circumferential sections of the secondary lining reinforcement outside the tunnel (the length of which is 1 / 3 of the original secondary lining length to ensure the single-unit rotation radius meets the tunnel clearance requirements at the rotation location). The assembly process utilizes a trolley's traveling, lifting, and rotating systems, along with longitudinal transport of the circumferential sections, a 90° rotation, and a trolley that moves forward, shifts to a more flexible position, and then retracts to its original position. Both approaches can meet the requirements for standardized and rapid assembly of tunnel secondary lining reinforcement.

[0030] The present invention has the following advantages:

[0031] First, this method enables centralized and standardized processing of secondary lining steel bars outside the tunnel, greatly reducing the time spent by steel bar workers binding steel bars inside the tunnel, and significantly improving the installation accuracy, standardization, and assembly concept of secondary lining steel bars.

[0032] Second, this method enables rapid and standardized installation of secondary lining reinforcement, significantly improving work efficiency, reducing the installation cycle of secondary lining reinforcement, and shortening the construction period.

[0033] Third, this method overturns the traditional secondary lining construction process, adopts standardized fabrication and transportation of secondary lining steel bars outside the tunnel and overall assembly and installation inside the tunnel, which is a complete replacement of the original process of binding the secondary lining steel bars in loose parts on site inside the tunnel.

[0034] Fourth, this method directly changed the working environment of steelworkers, moving the work from inside the tunnel to outside, greatly improving the harm to workers caused by the harsh environment inside the tunnel, significantly reducing occupational diseases, and truly embodying the people-oriented concept.

[0035] Fifth, this method eliminates common quality defects such as exposed reinforcement or excessive protective layer, and greatly improves the overall indicators such as project quality and concrete durability. Attached Figure Description

[0036] Appendix Figure 1 Technical route A: Schematic diagram of the fabrication and processing of steel reinforcement for the secondary lining outside the tunnel;

[0037] Appendix Figure 2 Technical route A: Schematic diagram of the prefabricated secondary lining reinforcement bending of five segments (ABCDE) outside the tunnel;

[0038] Appendix Figure 3 Schematic diagram of technical path A: forward movement of the secondary lining trolley;

[0039] Appendix Figure 4 Schematic diagram of the assembly trolley for secondary lining reinforcement moving to the position where the reinforcement is to be installed, for technical route A;

[0040] Appendix Figure 5 Schematic diagram of the deployment and jacking of prefabricated secondary lining reinforcement in five segments (ABCDE) for technical route A;

[0041] Appendix Figure 6 Technical Path A: Schematic diagram of the secondary lining reinforcement assembly trolley exiting the tunnel and the secondary lining trolley being positioned.

[0042] Appendix Figure 7 Technical path A: ABCDE five-segment prefabricated secondary lining steel reinforcement bending and unfolding principle diagram;

[0043] Appendix Figure 8 Technical Route B: Schematic diagram of the fabrication of circumferential segmented steel reinforcement for the secondary lining outside the tunnel;

[0044] Appendix Figure 9 Schematic diagram of the forward movement of the secondary lining trolley for technical route B;

[0045] Appendix Figure 10 For technical route B: Schematic diagram of the prefabricated trolley for secondary lining reinforcement moving to the position where the reinforcement is to be installed;

[0046] Appendix Figure 11 Technical Path B: Schematic diagram of the rotation of the circumferential segment of the secondary lining reinforcement in the tunnel;

[0047] Appendix Figure 12 Technical Approach B: Schematic diagram of single-segment jacking and positioning of secondary lining reinforcement circumferential sheet in tunnel;

[0048] Appendix Figure 13 Technical approach B: Schematic diagram after all three sheet segments have been connected to the invert arch reinforcement;

[0049] Appendix Figure 14 Technical Path B: Schematic diagram of the secondary lining reinforcement assembly trolley exiting the tunnel and the secondary lining trolley being positioned.

[0050] Appendix Figure 15 Schematic diagram of the prefabricated trolley structure for technical route B: secondary lining reinforcement.

[0051] Attached reference numerals: 1-Tunnel secondary lining reinforcement assembly site, 2-Secondary lining reinforcement assembly trolley, 3-Five-segment prefabricated secondary lining reinforcement (ABCDE), 4-Tunnel portal, 5-Constructed secondary lining, 6-Secondary lining trolley, 7-Constructed invert arch filling section, 8-Lifting system, 9-Traveling system, 10-Secondary lining reinforcement circumferential sheet, 11-Invert arch pre-embedded reinforcement, 12-Traveling rubber wheels, 13-Rotation system, 14-Modible hinge, 15-Hand-operated hoist, 16-Extendable jacking rod, 17-Lifting system above the track, 18-Steel wheel on the track, 19-Traveling steel rail. Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0053] Embodiment 1 of the present invention: A standardized and rapid assembly construction method for tunnel secondary lining reinforcement, as shown in the attached figure. Figure 1-7 As shown, this method specifically involves a secondary lining reinforcement assembly trolley 2, which is equipped with a walking system 9. The walking system 9 can achieve both wheeled and rail walking modes (wheeled walking is used when the invert arch filling surface is relatively flat, and rail walking can be selected when it is uneven). This method can transport the secondary lining reinforcement processed outside the tunnel to the tunnel via the secondary lining reinforcement assembly trolley 2. This trolley, as a reinforcement processing form, can complete the processing and fabrication of five segments of assembled secondary lining reinforcement 3 (A, B, C, D, and E) outside the tunnel. Movable hinges 14 are set between the reinforcement segments. Through the movable hinges 14, hand-operated hoists 15, jacking system 8, and telescopic jacking rods 16, the bending, unfolding, and precise positioning of the reinforcement segments with the invert arch pre-embedded reinforcement 11 can be completed.

[0054] The technical path A of the method of this invention is implemented as follows:

[0055] Step ①: As shown in the attached document Figure 1 As shown, on the secondary lining steel reinforcement assembly site 1 outside the tunnel, the secondary lining steel reinforcement assembly trolley 2 is used as a formwork to complete the processing and fabrication of five segments of prefabricated secondary lining steel reinforcement 3 (ABCDE). The ends of adjacent steel reinforcement segments are connected by movable hinges 14, and hand-operated hoists 15 and telescopic top rods 16 are installed on the columns on both sides of the secondary lining steel reinforcement assembly trolley 2. The trolley is equipped with a walking system 9.

[0056] Step ②: As attached Figure 2 and appendix Figure 7 As shown, after the five-segment prefabricated secondary lining steel reinforcement 3 (ABCDE) is manufactured, the chain of the hand-operated hoist 15 is connected to the segments of the five-segment prefabricated secondary lining steel reinforcement 3. By pulling the chain of the hand-operated hoist 15, the segments of the five-segment prefabricated secondary lining steel reinforcement 3 are bent inward around the movable hinge 14, which reduces the overall space of the five-segment prefabricated secondary lining steel reinforcement 3, thus meeting the spatial requirements for the five-segment prefabricated secondary lining steel reinforcement 3 to enter the tunnel.

[0057] Step 3: After the five-segment prefabricated secondary lining steel reinforcement 3 of ABCDE is bent, it is transported into the tunnel through the walking system 9 of the secondary lining steel reinforcement prefabricated trolley 2 (two methods are available: wheel walking is used when the invert arch filling surface is relatively flat, and track walking can be selected when it is uneven).

[0058] Step 4: As attached Figure 3 As shown, the secondary lining trolley 6 inside the tunnel is moved forward toward the tunnel face to make room for the pre-embedded steel bars 11 of the invert arch and the secondary lining steel bars to be installed. The trolley is then moved to this position, i.e., the pre-embedded steel bars 11 of the invert arch, by the traveling system 9 of the secondary lining steel bar assembly trolley 2.

[0059] Step 5: Slowly loosen the chain of the hand chain hoist 15, allowing the five segments of assembled secondary lining steel bars 3 (ABCDE) to unfold naturally under their own weight. For those that do not unfold completely, the retractable jacks 16 installed on the columns on both sides of the secondary lining steel bar assembly trolley 2 can be used to push them into place (as shown in the attached diagram). Figure 7 (As shown).

[0060] Step 6: As attached Figure 5 As shown, the five segments of prefabricated secondary lining steel bars 3 (ABCDE) are lifted to the design required position using the jacking system 8 on the prefabricated secondary lining steel bar assembly trolley 2. Finally, the five segments of prefabricated secondary lining steel bars 3 (ABCDE) are connected to the pre-embedded steel bars 11 of the invert arch in accordance with the specifications.

[0061] Step 7: After the five-segment prefabricated secondary lining steel bars 3 (ABCDE) are connected to the pre-embedded steel bars 11 of the invert arch, the jacking system 8 of the secondary lining steel bar prefabricated trolley 2 descends to complete the trolley descent. The trolley then detaches from the five-segment prefabricated secondary lining steel bars 3 to achieve trolley unloading, and then the secondary lining steel bar prefabricated trolley 2 is driven out of the tunnel.

[0062] Step 8: The prefabricated secondary lining reinforcement trolley 2 moves out of the tunnel, making room for the prefabricated secondary lining reinforcement 3 in sections ABCDE. The secondary lining trolley 6 then moves to this position for positioning and concrete pouring (as shown in the attached document). Figure 6 (As shown).

[0063] In the implementation path A of this invention, the secondary lining trolley 6, lifting system 8, walking system 9, movable hinge 14, hand chain hoist 15 and telescopic top rod 16 are all existing devices, and the technologies and principles involved in these devices are all known to those skilled in the art.

[0064] Embodiment 2 of the present invention: a standardized and rapid assembly construction method for tunnel secondary lining reinforcement, as shown in the attached figure. Figure 8-15As shown, technical approach B reduces the overall height of the secondary lining reinforcement by increasing the height of the pre-embedded steel bars 11 in the invert arch. Then, using the secondary lining reinforcement assembly trolley 2 outside the tunnel as a fabrication jig for the secondary lining reinforcement, the circumferential sheet 10 of the secondary lining reinforcement is fabricated. The length of the circumferential sheet 10 is 1 / 3 of the secondary lining length to ensure that the single-unit rotation radius meets the tunnel clearance requirements at the rotation location. The longitudinal movement of the circumferential sheet 10 is achieved through the traveling system 9 of the secondary lining reinforcement assembly trolley 2, and a 90° rotation is achieved through the rotation system 13 of the trolley. The design elevation is positioned through the jacking system 8 of the trolley. By using techniques such as the secondary lining trolley 6 moving forward, spatially misaligning, and then retracting, the standardized and rapid assembly construction requirements for the tunnel secondary lining reinforcement can be achieved.

[0065] The technical path B of the method of this invention is implemented as follows:

[0066] Step ①: At the secondary lining reinforcement assembly site 1 outside the tunnel, the secondary lining reinforcement assembly trolley 2 is used as a formwork to complete the fabrication of the circumferential reinforcement sheet 10. This trolley is equipped with a lifting system 8, a traveling system 9, and a rotating system 13. The circumferential reinforcement sheet 10 is then assembled according to the attached... Figure 8 The tunnel is entered in the posture shown, that is, the entire secondary lining steel circumferential sheet 10 is perpendicular to the tunnel cross section.

[0067] Step ②: Move the secondary lining trolley 6 forward towards the tunnel face to make room for the pre-embedded steel bars 11 in the invert arch and the secondary lining steel bars to be installed (e.g., Figure 9 As shown), the secondary lining reinforcement assembly trolley 2 is moved longitudinally to this position, namely the pre-embedded reinforcement 11 of the invert arch, by the traveling system 9 of the trolley 2. Figure 10 (As shown).

[0068] Step ③: As attached Figure 11 As shown, the circumferential sheet 10 of the secondary lining steel reinforcement assembly trolley 2 is rotated 90° at the pre-embedded steel reinforcement 11 in the invert arch, i.e., the position where the steel reinforcement is to be installed, by the rotation system 13 of the trolley 2.

[0069] Step 4: After completing the 90° rotation, the secondary lining reinforcement circumferential sheet 10 is lifted to the design height using the jacking system 8 of the secondary lining reinforcement assembly trolley 2. The secondary lining reinforcement circumferential sheet 10 is then connected to the pre-embedded reinforcement 11 of the invert arch in accordance with the specifications (see attached). Figure 12 (As shown).

[0070] Step 5: After the secondary lining steel reinforcement circumferential plate 10 is connected to the invert arch pre-embedded steel reinforcement 11, the trolley is lowered by the lifting system 8 of the secondary lining steel reinforcement assembly trolley 2, that is, the trolley is disengaged from the secondary lining steel reinforcement circumferential plate 10 to realize the trolley unloading, and then the trolley is driven out of the tunnel.

[0071] Step 6: Repeat steps 1 to 5 to assemble the remaining two secondary lining steel circumferential plates 10 (as shown in the attached document). Figure 13 (As shown).

[0072] Step 7: Move the secondary lining reinforcement assembly trolley 2 out of the tunnel, making room for the three pre-positioned secondary lining reinforcement circumferential plates 10. Then move the secondary lining trolley 6 to this position for positioning and concrete pouring (as shown in the attached document). Figure 14 (As shown).

[0073] The secondary lining trolley 6, lifting system 8, traveling system 9, and rotating system 13 involved in the method of the present invention are all existing devices, and the technologies and principles involved in these devices are all known to those skilled in the art.

[0074] In both Embodiments 1 and 2 described above, the assembly trolley 2 for the secondary lining reinforcement has the same structural composition, mainly including the trolley body, a walking system 9, a lifting system 8, a rotating system 13, a hand-operated hoist 15, and a telescopic jacking rod 16. In Technical Path A, rotation of the five-segment (ABCDE) assembled secondary lining reinforcement 3 is not required, therefore the rotating system 13 is unnecessary. In Technical Path B, folding and unfolding of the circumferential sheet 10 of the secondary lining reinforcement is not required, therefore the hand-operated hoist 15 and the telescopic jacking rod 16 are unnecessary. Since the volume of the circumferential sheet 10 of the secondary lining reinforcement is smaller than the volume of the five-segment (ABCDE) assembled secondary lining reinforcement 3, the assembly trolley 2 for supporting and transporting the circumferential sheet 10 in Technical Path B does not need to be as large as the assembly trolley 2 for supporting and transporting the five-segment (ABCDE) assembled secondary lining reinforcement 3 in Technical Path A. The assembly trolley 2 for the secondary lining reinforcement in Technical Path B is smaller in size, easier to manufacture, and has a lower cost.

[0075] In both Embodiments 1 and 2 above, the walking system 9 can achieve both wheeled and rail walking modes (wheeled walking is used when the invert arch filling surface is relatively flat, and rail walking can be selected when it is uneven). The walking system switches as follows: when switching from wheeled walking to rail walking, the lifting system 17 above the rail lifts the rail steel wheel 18 out and onto the walking rail 19. If it continues to be lifted out, the walking rubber wheel 12 will be suspended from the ground, completing the transition from wheeled walking to rail walking, and vice versa.

[0076] The rail lifting system 17, rail steel wheel 18, traveling rail 19, and traveling rubber wheel 12 are all existing devices, and the technologies and principles involved in these devices are known to those skilled in the art.

Claims

1. A standardized and rapid assembly construction method for tunnel secondary lining reinforcement, characterized in that: The second lining steel bars installed in the tunnel hole are assembled as a whole outside the tunnel hole, and then are transported into the hole by the second lining steel bar assembly trolley (2) to be assembled and installed with the inverted arch embedded steel bars (11); the specific implementation methods are two, which are technical path A and technical path B; The technical path A is to process the ABCDE five-section assembled second lining steel bars (3) outside the hole, to realize inward bending between sections to reduce the size of the ABCDE five-section assembled second lining steel bars (3), and then to complete the transportation, jacking and second lining concrete pouring of the ABCDE five-section assembled second lining steel bars (3) through the walking system (9), jacking system (8) and space dislocation and back to position technology of the second lining trolley (6) moving forward; The technical path A specifically includes the following steps: A1: A second lining steel bar assembly trolley (2) is arranged on a hole outside steel bar manufacturing site (1); A2: The second lining steel bar assembly trolley (2) is used as a membrane to complete the manufacturing of the ABCDE five-section assembled second lining steel bars (3) thereon, the manufactured ABCDE five-section assembled second lining steel bars (3) have the same direction as the tunnel direction, and the ABCDE five-section assembled second lining steel bars (3) are folded between sections to reduce the overall size of the ABCDE five-section assembled second lining steel bars (3); A3: The second lining trolley (6) is moved forward to the front of the inverted arch embedded steel bars (11); A4: The ABCDE five-section assembled second lining steel bars (3) are moved to the installation position in the tunnel with the second lining steel bar assembly trolley (2) through the walking system (9); A5: The ABCDE five-section assembled second lining steel bars (3) are unfolded to the shape before folding, and then the five-section assembled second lining steel bars (3) are jacked to the design position by the jacking system (8) of the second lining steel bar assembly trolley (2); A6: The ABCDE five-section assembled second lining steel bars (3) are connected with the inverted arch embedded steel bars (11); A7: The jacking system (8) is lowered to separate the ABCDE five-section assembled second lining steel bars (3) from the second lining steel bar assembly trolley (2), and then the second lining steel bar assembly trolley (2) is moved out of the hole; A8: The second lining trolley (6) is moved to the original position to complete the pouring of the second lining concrete; The technical path B is to process the second lining steel bar ring-shaped pieces (10) outside the hole, to reduce the overall height of the second lining steel bar ring-shaped pieces (10) by lengthening the height of the inverted arch embedded steel bars (11) to meet the passage, and then to complete the longitudinal transportation, 90° rotation, jacking and second lining concrete pouring of the second lining steel bar ring-shaped pieces (10) through the walking system (9), rotating system (13), jacking system (8) and space dislocation and back to position technology of the second lining trolley (6) moving forward; The technical path B specifically includes the following steps: B1: Set up a steel bar making site outside the tunnel (1) outside the tunnel, and set up a two-liner steel bar assembly trolley (2) on the steel bar making site (1); B2: Take the two-liner steel bar assembly trolley (2) as a membrane, and complete the making of a two-liner steel bar circumferential piece (10) thereon, the overall direction of the two-liner steel bar circumferential piece (10) is perpendicular to the direction of the tunnel, and the longitudinal length of the two-liner steel bar circumferential piece (10) is 1 / 3 of the length of the two-liner mold; B3: Move the two-liner trolley (6) forward to the front of the inverted arch pre-embedded steel bar (11) in the direction of the tunnel face; B4: Move the two-liner steel bar circumferential piece (10) to the installation position in the tunnel by the walking system (9) along with the two-liner steel bar assembly trolley (2); B5: Lift the two-liner steel bar circumferential piece (10) to the designed height by the lifting system (8), then rotate the two-liner steel bar circumferential piece (10) by 90° to the same direction as the direction of the tunnel by the rotating system (13) at the top of the two-liner steel bar assembly trolley (2); B6: Connect the two-liner steel bar circumferential piece (10) with the inverted arch pre-embedded steel bar (11), and lengthen the height of the inverted arch pre-embedded steel bar (11) protruding from the ground when it is pre-embedded; B7: Lower the lifting system (8) to separate the two-liner steel bar circumferential piece (10) from the two-liner steel bar assembly trolley (2), and then move the two-liner steel bar assembly trolley (2) out of the tunnel; B8: Repeat steps B2-B7 to complete the installation, transportation and connection of the remaining two two-liner steel bar circumferential pieces (10); B9: Move the two-liner trolley (6) to the original position to complete the pouring of the two-liner concrete.

2. The method according to claim 1, wherein the method is characterized by: The walking system (9) can realize two walking modes of wheels and tracks, and when the filling surface of the inverted arch is relatively flat, the wheel walking mode is adopted, and when the filling surface of the inverted arch is not flat, the track walking mode is selected. The two walking modes are switched as follows: when the wheel walking mode enters the track walking mode, the track steel wheel (18) is lifted out by the lifting system (17) above the track and falls on the walking steel rail (19), and then the walking rubber wheel (12) is continuously lifted to be suspended in the air to complete the conversion from the wheel walking mode to the track walking mode, and vice versa.

3. The method according to claim 1, wherein the method is characterized by: The ABCDE five-segment assembly two-liner steel bar (3) is connected with a movable hinge (14) at the end of adjacent steel bar segments, and a hand chain block (15) and a telescopic jack (16) are arranged at the two side columns of the two-liner steel bar assembly trolley (2). In step A2, the segments of the ABCDE five-segment assembly two-liner steel bar (3) are bent inward around the movable hinge (14) by pulling the chain of the hand chain block (15), so that the overall space of the ABCDE five-segment assembly two-liner steel bar (3) is reduced. In step A5, the chain of the hand chain block (15) is loosened, so that the segments of the ABCDE five-segment assembly two-liner steel bar (3) naturally expand under the action of gravity. For those that do not expand in place, the telescopic jack (16) is used to push them into place.

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