Longitudinal pouring device for the arch crown of secondary lining and secondary lining trolley

Abstract

The present invention provides a longitudinal pouring device for the arch top of the secondary lining and a secondary lining trolley. The pouring device is arranged on the secondary lining trolley. The pouring device includes a guiding steel end form, a concrete conveying pipe, a pouring driving assembly and a switching baffle assembly. A guiding channel extending longitudinally is arranged in the guiding steel end form. The concrete conveying pipe penetrates through the guiding channel. The pouring driving assembly drives the concrete conveying pipe to move longitudinally in the guiding channel. The switching baffle assembly includes a switching baffle and a baffle driving device. Along the radial direction of the guiding channel, the width of the switching baffle is greater than the width of the guiding channel. The baffle driving device drives the switching baffle to move towards or away from the guiding channel. The guiding channel covered by the switching baffle. With the above structure, while avoiding the existence of a floating slurry soft layer near the waterproof layer at the arch top of the lining and reducing the occurrence of voids, it also avoids the phenomenon of small slumps of the concrete at this position when pulling out the concrete conveying pipe, ensuring that the concrete at the end of the arch top is overall full and dense.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and specifically relates to a longitudinal perfusion device for the vault of a secondary lining and a secondary lining trolley. Background Art

[0002] In the construction of tunnel projects, the quality of the existing lining pouring construction process largely depends on the functionality of the lining trolley used; currently, the technology of lining trolleys has developed rapidly, and the concrete perfusion method has also evolved from the simple single-pipe perfusion of a concrete delivery pump and the combined chutes for pouring window by window to the current on-site application of an automatic material distribution and window-by-window pouring system. However, no matter which of the above perfusion modes is adopted, a "vertical" perfusion method is used, that is, the perfusion pipe is perpendicular to the circumferential side wall of the tunnel; the "vertical" perfusion method can be divided into two types: single-hole perfusion and multi-hole perfusion. Among them, single-hole perfusion is to pour concrete into a certain length of lining area through a single hole, while multi-hole perfusion is to pour concrete into the same length of lining area through multiple holes simultaneously.

[0003] With the increase in the frequency of tunnel lining quality inspection, it is found that there are late-stage quality drawbacks in single-hole perfusion in the "vertical" perfusion method, such as poor concrete fluidity, insufficient top-pushing pressure, and dense steel bars, which directly lead to major quality defects such as voids and non-compaction in the vault of the lining.

[0004] See Figure 1 , the existing construction method for multi-hole perfusion in the "vertical" perfusion of the vault area is as follows: primary support 02 is carried out on the surrounding rock 01, steel bars 03 are installed along the circumferential and longitudinal directions of the tunnel on the side wall of the primary support, end-sealing steel formwork 05 and plugging plates 06 at the lining end are installed on the lining trolley 04, and back-bonded waterstops 07 and embedded waterstops 08 are installed by using the end-sealing steel formwork 05 and the annular plugging plates 06; a plurality of concrete perfusion ports 041 are provided on the panel of the lining trolley 04, and concrete is poured vertically from the concrete perfusion ports 041 between the primary support 02 and the panel 042 of the secondary lining trolley 04 to obtain the secondary lining 043.

[0005] See Figure 2 , after multi-hole perfusion is completed, since the concrete accumulates from bottom to top, it is very easy to sandwich the floating slurry floating on the surface during concrete construction in the middle position and cannot be effectively discharged centrally. As a result, there is a floating slurry soft layer near the waterproof layer 09 in the vault of the lining. At the same time, multiple voids 010 will also be formed in the arch top concrete, resulting in problems such as non-compaction of the concrete layer. Moreover, the plugging operation of each perfusion port 041 after stopping perfusion is rather cumbersome. See Figure 3 , manually fill plugging materials 011 such as plugging cloth into the perfusion port 041, see Figure 4, due to the fluidity of the concrete, if the stuffing is carried out at an inappropriate time, it will cause the concrete above the pouring port 041 to collapse and form a cavity, and after the formwork of the secondary lining trolley is demolded, irregular pits 012 will be formed on the surface of the pouring port, and the stuffing material 011 will remain in the pits 012, which needs to be cleaned and polished, and the process is complicated; in addition, the large number of arch pouring ports 041 formed by multi-hole pouring leads to cumbersome operations such as pipe replacement, disassembly and assembly, and the construction time is too long. Summary of the Invention

[0006] The first object of the present invention is to provide a longitudinal pouring device for the top of the secondary lining for realizing longitudinal pouring of concrete.

[0007] The second object of the present invention is to provide a secondary lining trolley including the above-mentioned pouring device.

[0008] To achieve the above main object, the longitudinal pouring device for the top of the secondary lining provided by the present invention includes a guiding steel end form, a concrete delivery pipe, a pouring driving assembly and a switching baffle assembly. A guiding channel extending longitudinally is arranged in the guiding steel end form. The concrete delivery pipe penetrates through the guiding channel. The pouring driving assembly drives the concrete delivery pipe to move longitudinally in the guiding channel. The switching baffle assembly includes a switching baffle and a baffle driving device. Along the radial direction of the guiding channel, the width of the switching baffle is greater than the width of the guiding channel. The baffle driving device drives the switching baffle to move towards or away from the guiding channel, and the switching baffle covers the guiding channel.

[0009] As can be seen from the above solution, before pouring the concrete in the vault area of the secondary lining, a ring-shaped plugging plate and a pouring device are provided on the end head of the secondary lining trolley. The ring-shaped plugging plate and the guiding steel end form a dense plugging surface on the secondary lining trolley. Before pouring the concrete in the vault area, the concrete delivery pipe penetrates through the guiding channel of the guiding steel end form and extends longitudinally, so that the concrete delivery pipe extends between the primary support and the secondary lining trolley. During the pouring process, as the concrete delivery pipe retreats longitudinally, the concrete is gradually poured through the concrete delivery pipe. Since the concrete delivery pipe moves longitudinally along the tunnel, the floating slurry in the concrete is located in the front, enabling the floating slurry to be more effectively concentrated and discharged, and at the same time, the floating slurry will not be sandwiched near the waterproof layer, thus avoiding the existence of a floating slurry soft layer near the waterproof layer at the vault of the lining. Moreover, compared with the vertical pouring of the vault area, the longitudinal pouring of the vault area is more likely to fill the secondary lining with concrete, reducing the occurrence of voids and further avoiding the situation of non-compact concrete layers. Furthermore, since the guiding channel is outside the secondary lining, when the guiding channel is filled with concrete, a concrete column of a certain shape protruding from the concrete layer of the secondary lining is naturally formed, and at the same time, it can ensure that the concrete layer of the secondary lining is filled, and it can avoid the phenomenon of small slump of the concrete at this position when the concrete delivery pipe is finally pulled out near the guiding steel end form, ensuring that the concrete at the end of the vault is overall full and dense. When the guiding channel in the guiding steel end form is filled with concrete and the concrete pouring stops, the switching baffle quickly moves to cover the guiding channel to achieve sealing. Without relying on manual plugging, it can avoid the formation of irregular pits after demoulding and the need to clean the stuffing objects, effectively improving the work efficiency.

[0010] A further solution is that the switching baffle assembly is arranged inside the guiding steel end form. A first installation chamber is arranged inside the guiding steel end form. The first installation chamber is arranged outside the guiding channel and is connected to the guiding channel. The switching baffle assembly is arranged in the first installation chamber, and the switching baffle moves from the first installation chamber to the guiding channel. A slide rail is arranged on the inner side wall of the first installation chamber. The switching baffle is connected in cooperation with the slide rail. The slide rail extends along the radial direction of the guiding channel, and the switching baffle moves along the extending direction of the slide rail.

[0011] It can be seen that the switching baffle assembly is arranged inside the steel end form, which is convenient for the concrete delivery pipe to continuously pour concrete in the guiding channel until it ensures that the secondary lining area is filled and a concrete column of a certain length is formed in the guiding channel to avoid the occurrence of small slump phenomenon, and then the switching baffle quickly seals, making the pouring effect better.

[0012] A further solution is that the guiding channel includes a guiding pipe section and a sealing section. The guiding pipe section and the sealing section are longitudinally connected. The switching baffle is arranged between the guiding pipe section and the sealing section. The sealing section is conical, and the axis of the sealing section extends longitudinally.

[0013] It can be seen that the switching baffle is arranged between the guiding pipe section and the sealing section. After the pipe is pulled out, the sealing section is filled with concrete. The sealing section is conical, which can make it easier for the guiding steel end mold to be demolded.

[0014] A further solution is that the pouring device includes a bracket. The bracket penetrates through the guiding channel. An arc-shaped lifting part is arranged on the bracket, and the concrete delivery pipe is arranged on the arc-shaped lifting part; the bracket includes multiple bracket sections, and every two adjacent bracket sections are connected longitudinally.

[0015] It can be seen that since the penetration length of the concrete delivery pipe is relatively large, the bracket is used to lift the concrete delivery pipe. While preventing the concrete delivery pipe from shaking during the backward pouring process, the bracket lifts the concrete delivery pipe, keeping the concrete delivery pipe at a certain height, making the concrete distribution more uniform and dense; the splicing structure of the multiple bracket sections on the bracket allows for the removal of one bracket section after pouring the concrete in a relatively completed area. During the entire pouring process, the pouring progress can be adjusted more reasonably according to the pouring situation of each area.

[0016] A further solution is that the bracket includes multiple connecting components. Longitudinally, every two adjacent bracket sections are connected by a connecting component. The connecting component includes a fixed clip and at least two fixing bolts. The fixed clip is respectively connected to the two adjacent bracket sections, and at least one fixing bolt is simultaneously connected to the fixed clip and one bracket section.

[0017] It can be seen that the bolt connects the fixed clip to the bracket section, and the fixed clip connects the two bracket sections. Using bolts and fixed clips for connection makes it easier to achieve quick disassembly during the pouring process.

[0018] A further solution is that the pouring driving component includes a gear and a pouring driving device. The pouring driving device drives the gear to rotate. A rack is arranged on the concrete delivery pipe. The rack extends longitudinally and meshes with the gear.

[0019] It can be seen that through the meshing of the gear and the rack, the motor drives the gear to rotate, driving the rack to move, thereby realizing the automatic movement of the concrete delivery pipe while better adjusting the speed of the movement of the concrete delivery pipe.

[0020] A further solution is that a second installation chamber is arranged inside the guiding steel end mold. The second installation chamber is connected to the guiding channel. The pouring driving component includes a housing. The gear and the driving device are respectively arranged inside the housing, and one end of the gear penetrates through the housing and extends into the guiding channel.

[0021] It can be seen that the pouring driving component is inside the guiding steel end mold, realizing the integrity of the pouring driving component and the guiding steel end mold. During the final demolding, the guiding steel end mold can be demolded more quickly.

[0022] A further solution is that the perfusion device includes a form removal assembly, the form removal assembly includes a sliding sleeve and a form removal driving device, the guiding steel end form is connected to the inner pipe of the sliding sleeve, and the form removal driving device drives the inner pipe of the sliding sleeve to move longitudinally.

[0023] It can be seen that through the automatic form removal process of the guiding steel end form by the disassembly assembly, the disassembly is automated.

[0024] To achieve the above second object, the secondary lining trolley provided by the present invention includes the above perfusion device.

[0025] A further solution is that a circumferential plugging plate and a guiding steel end form are provided on the end head of the secondary lining trolley. The guiding steel end form is arranged in the crown area of the secondary lining trolley, and the circumferential plugging plate is arranged along the axial direction of the panel of the secondary lining trolley; a slurry discharge plate is arranged between the circumferential plugging plate and the guiding steel end form, and a plurality of slurry discharge holes are arranged on the slurry discharge plate.

[0026] It can be seen that with the longitudinal movement and perfusion of the concrete delivery pipe, the floating slurry on the concrete surface is located in the front, and the floating slurry is effectively discharged through the slurry discharge holes on the slurry discharge plate, avoiding the formation of a floating slurry soft layer in the concrete and resulting in quality problems. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the "vertical" multi-hole perfusion operation in the crown area in the background art.

[0028] Figure 2 It is an effect diagram after "vertical" perfusion and form removal in the crown area in the background art.

[0029] Figure 3 It is an effect diagram of manually stuffing the perfusion port in the background art.

[0030] Figure 4 It is an effect diagram at the perfusion port after form removal of the secondary lining trolley in the background art.

[0031] Figure 5 It is a side sectional view of an embodiment of the longitudinal perfusion device for the crown of the secondary lining of the present invention.

[0032] Figure 6 It is a front sectional view of an embodiment of the longitudinal perfusion device for the crown of the secondary lining of the present invention.

[0033] Figure 7 It is a top sectional view of an embodiment of the longitudinal perfusion device for the crown of the secondary lining of the present invention.

[0034] Figure 8 It is a front view of the bracket in an embodiment of the longitudinal perfusion device for the crown of the secondary lining of the present invention.

[0035] Figure 9It is the front view of the bracket in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0036] Figure 10 It is the installation schematic diagram of the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention installed on the secondary lining trolley.

[0037] Figure 11 It is the schematic diagram of the preparation step before pouring in the longitudinal pouring method for the arch crown area in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0038] Figure 12 It is the schematic diagram of the arch crown pouring step in the longitudinal pouring method for the arch crown area in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0039] Figure 13 It is the schematic diagram after switching the baffle to seal in the arch crown pouring step in the longitudinal pouring method for the arch crown area in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0040] Figure 14 It is the schematic diagram of the removal of the pouring device in the form removal step in the longitudinal pouring method for the arch crown area in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0041] Figure 15 The schematic diagram of the removal of the secondary lining trolley in the form removal step in the longitudinal pouring method for the arch crown area in the embodiment of the longitudinal pouring device for the arch crown of the secondary lining of the present invention.

[0042] The following further explains the present invention in conjunction with the drawings and embodiments. Specific embodiments

[0043] The longitudinal pouring device for the arch crown of the secondary lining of the present invention is applied to the secondary lining pouring process in the arch crown area of the tunnel. The pouring device is arranged on the secondary lining trolley. The pouring device limits the extending direction of the concrete conveying pipe through the guiding channel in the guiding steel end form, so that it is poured in a longitudinal backward manner, making the floating slurry in the concrete located in the front, enabling the floating slurry to be more effectively concentrated and discharged, and at the same time, the floating slurry will not be clamped near the waterproof layer, thus avoiding the existence of a floating slurry soft layer near the waterproof layer of the lining arch crown. And the longitudinal pouring in the arch crown area is relatively easier to fill the secondary lining with concrete than the vertical pouring in the arch crown area, reducing the occurrence of voids, and further avoiding the situation of non-compact concrete layers.

[0044] See Figure 5 、 Figure 6 and Figure 7, the longitudinal pouring device 1 for the arch top of the secondary lining includes a guiding steel end mold 2, a concrete delivery pipe 3, a bracket 4, a pouring driving assembly 5, a switching baffle assembly 6, and a form removal assembly 7. A guiding channel 21 extending longitudinally along the tunnel is provided inside the guiding steel end mold 2. The concrete delivery pipe 3 penetrates through the guiding channel 21. The bracket 4 is used to support the concrete delivery pipe 3. The pouring driving assembly 5 is used to drive the concrete delivery pipe 3 to penetrate or retreat along the extending direction of the guiding channel 21. The switching baffle assembly 6 is used for sealing work after the concrete pouring stops. The form removal assembly 7 is used for demolding the pouring device after the concrete solidifies.

[0045] In this embodiment, the guiding steel end mold 2 includes an upper guiding steel end mold 22 and a lower guiding steel end mold 23. The upper guiding steel end mold 22 is connected to the lower guiding steel end mold 23. A middle-buried waterstop can be clamped between the upper guiding steel end mold 22 and the lower guiding steel end mold 23. The guiding channel 21 and the switching baffle assembly 6 are respectively arranged on the upper guiding steel end mold 22. The guiding channel 21 extends longitudinally along the upper guiding steel end mold 22 of the tunnel. The concrete delivery pipe 3 is placed on the bracket 4. The concrete delivery pipe 3 and the bracket 4 penetrate through the guiding channel 21 longitudinally along the tunnel. The bracket 4 can be in clearance fit with the inner side of the guiding channel 21.

[0046] In this embodiment, refer to Figure 8 and Figure 9 , an arc-shaped supporting part 40 is provided on the bracket 4. The concrete delivery pipe 3 is placed on the arc-shaped supporting part 40. Since the concrete delivery pipe 3 has a certain flexibility, when the concrete delivery pipe 3 penetrates longitudinally along the tunnel, as the penetration length gradually increases, the end of the concrete delivery pipe 3 can droop under the action of gravity. The bracket 4 supports the concrete delivery pipe 3, so that the concrete delivery pipe 3 can always be kept at a certain height during the pouring process and the shaking of the concrete delivery pipe 3 can be reduced. The bracket 4 includes multiple bracket sections 41, and every two adjacent bracket sections 41 are connected longitudinally; when the concrete delivery pipe 3 moves forward or backward, the connection or disassembly between every two adjacent bracket sections 41 is carried out step by step to avoid the difficulty of operation caused by an overly long bracket 4. A short arc-shaped supporting part 410 is respectively provided on each bracket section 41. After multiple bracket sections 41 are connected longitudinally along the tunnel, the short arc-shaped supporting parts 410 on each bracket section 41 are connected to form the arc-shaped supporting part 40 of the bracket 4. The bracket 4 includes multiple connecting components 42. Longitudinally, every two adjacent bracket sections 41 are respectively connected to a connecting component 42. The connecting component 42 includes two fixed clamping pieces 421 and at least two fixed bolts 422. The two fixed clamping pieces 421 are respectively connected to two adjacent bracket sections 41, and the two fixed clamping pieces 421 are respectively located on both sides of the arc-shaped supporting part 40 longitudinally along the tunnel. At least one fixed bolt 422 is simultaneously connected to the fixed clamping piece 421 and a bracket section 41. The fixed bolts 422 on two adjacent bracket sections 41 are arranged collinearly longitudinally along the tunnel.

[0047] Inside the upper guiding steel end mold 22, a guiding pipe section 24 and a sealing section 25 are arranged longitudinally along the tunnel. The guiding pipe section 24 is longitudinally connected to the sealing section 25, and the sealing section 25 is close to the secondary lining to be poured. The sealing section 25 is conical, and the axis of the sealing section 25 extends longitudinally along the tunnel, making it easier for the guiding steel end mold 2 to be demolded. Radially along the guiding channel 21, a first installation chamber 26 and a second installation chamber 27 are arranged outside the guiding channel 21. The first installation chamber 26 and the second installation chamber 27 are respectively arranged inside the upper guiding steel end mold 22. The first installation chamber 26 and the second installation chamber 27 are respectively communicated with the guiding channel 21. The first installation chamber 26 is correspondingly arranged at the intersection of the connection between the guiding pipe section 24 and the sealing section 25, and the second installation chamber 27 is arranged beside the guiding pipe section 24. The first installation chamber 26 is used to place the switching baffle assembly 6, and the second installation chamber 27 is used to place the perfusion driving assembly 5. Longitudinally along the tunnel, the first installation chamber 26 is closer to the secondary lining of the tunnel than the second installation chamber 27, so that during the final pipe pulling operation, it is ensured that the bracket 4 and the concrete delivery pipe 3 completely withdraw from the sealing section 25 before the sealing operation of the switching baffle assembly 6 is carried out.

[0048] The switching baffle assembly 6 includes a switching baffle 61 and a baffle driving device 62. Radially along the guiding channel 21, the width of the switching baffle 61 is greater than the width of the guiding channel 21. The baffle driving device 62 drives the switching baffle 61 to move towards or away from the guiding channel 21, and the switching baffle 61 covers the guiding channel 21. After the concrete pouring stops, the baffle driving device 62 drives the switching baffle 61 to move towards the guiding channel 21. The switching baffle 61 moves from inside the first installation chamber 26 to between the guiding pipe section 24 and the sealing section 25, and the switching baffle 61 covers the guiding channel 21, thus realizing sealing. Without relying on manual plugging, it can avoid forming irregular pits after demolding and does not require cleaning of the stuffing objects, effectively improving work efficiency. In this embodiment, the baffle driving device 62 can be a hydraulic cylinder.

[0049] In this embodiment, vertically, slide rails 261 are respectively arranged on the two side walls of the first installation chamber 26 that are opposite to each other up and down. The two slide rails 261 can respectively extend radially along the guiding channel 21, and the two slide rails 261 are arranged in parallel. The switching baffle 61 is respectively connected in cooperation with the two slide rails 261, and the baffle driving device 62 drives the switching baffle 61 to move along the extending direction of the slide rails 261. Corresponding to the positions of the two slide rails 261, upper raised strips 262 and lower raised strips 263 are respectively arranged on the two outer side walls of the upper guiding channel 21. The slide rail 261 located above extends into the upper raised strip 262, and the slide rail 261 located below extends into the lower raised strip 263.

[0050] The perfusion driving assembly 5 includes a gear and a perfusion driving device 51. The perfusion driving device 51 drives the gear to rotate. A rack is provided on the concrete delivery pipe 3, and the rack extends longitudinally and meshes with the gear. In this embodiment, the perfusion driving assembly 5 includes a housing 50, two first driven gears 52, two second driven gears 53, and a driving gear 54. The two first driven gears 52, the two second driven gears 53, the driving gear 54, and the perfusion driving device are respectively located inside the housing. The two first driven gears 52 are coaxially connected, and the two second driven gears 53 are collinearly connected. The bracket 4 is located between the first driven gear 52 and the second driven gear 53. Two racks are provided on the bracket 4. One of the two first driven gears 52 meshes with one of the racks, and one of the two second driven gears 53 meshes with the other rack. The other of the two first driven gears 52 and the other of the two second driven gears 53 respectively mesh with the driving gear 54. The perfusion driving device 51 drives the driving gear 54 to rotate, and the perfusion driving device 51 can be a motor. In this embodiment, the topmost first driven gear 52 and the second driven gear 53 in the perfusion driving assembly 5 are respectively located in the second installation chamber 27. One end of the first driven gear 52 and one end of the second driven gear 53 respectively extend into the guiding channel 21 in the second installation chamber 27 and respectively mesh with the racks on the bracket 4.

[0051] As another implementation manner, the switching baffle assembly 6 and the perfusion driving assembly 5 can be respectively arranged outside the guiding steel end mold 2, and the installation position of the switching baffle assembly 6 is closer to the secondary lining of the tunnel than the installation position of the perfusion driving assembly 5.

[0052] The perfusion device 1 includes a form removal assembly 7. The form removal assembly 7 includes two sliding sleeves 71, a support plate 73, and two form removal driving devices 72. The support plate 73 is connected between the two sliding sleeves 71, and the support plate 73 is respectively connected to the inner pipes of the two sliding sleeves 71. In this embodiment, the form removal driving device 72 can be a hydraulic cylinder. One form removal driving device 72 is respectively connected to the inner pipe of one sliding sleeve 71, and the form removal driving device 72 drives the inner pipe of the sliding sleeve 71 to move longitudinally. The housing in the perfusion driving assembly 5 and the lower guiding steel end mold 23 are arranged on the support plate 73. When the form removal driving device 72 drives the inner pipe of the sliding sleeve 71 to move longitudinally, it drives the lower guiding steel end mold 23 to move, thereby driving the entire perfusion device 1 to move away from the secondary lining to realize form removal. In this embodiment, the support plate 73 is further provided with two gusset triangular plates 74, and the housing 50 is clamped between the two gusset triangular plates 74 to maintain the stability of the perfusion driving assembly 5.

[0053] The secondary lining trolley includes a circumferential plugging plate 06 and a pouring device 1. The circumferential plugging plate 06 and the pouring device 1 are respectively arranged at the ends of the secondary lining trolley. The pouring device 1 is the above-mentioned pouring device 1, and the concrete pouring process for the secondary lining in the tunnel crown area can be carried out by using this kind of lining trolley. Refer to Figure 10 , when the initial spraying is completed on the surrounding rock 01 and the secondary lining is about to be carried out, first position the secondary lining trolley, and then install the annular plugging plate 06 and the pouring device 1 on the secondary lining trolley. The annular plugging plate 06 is respectively arranged along the circumference of the panel 042 of the secondary lining trolley on both sides of the non-crown area of the secondary lining trolley, and the pouring device 1 is correspondingly arranged at the position of the panel 042 of the secondary lining trolley corresponding to the tunnel crown area, so that the pouring device 1 is formed between the annular plugging plates 06 on both sides. In the embodiment, the fixed outer tube of the sliding sleeve 71 and the lower guiding steel end mold 23 are fixed on the panel of the secondary lining trolley. Based on the panel 042 of the secondary lining trolley, adjust the height of the protruding guiding steel end mold 2 corresponding to the thickness of the secondary lining concrete layer.

[0054] Two slurry discharging plates 8 and an adjusting plugging plate 9 are arranged on the secondary lining trolley. The adjusting plugging plate 9 is arranged above the guiding steel end mold 2. The arrangement of the adjusting plugging plate 9 makes the end of the secondary lining arranged tightly, ensuring the formation of the concrete layer and at the same time carrying out the functional division of the overall system. One slurry discharging plate 8 is respectively arranged between the annular plugging plate 06 on one side and the guiding steel end mold 2, and the slurry discharging plate 8 is in clearance fit with the annular plugging plate 06 and the guiding steel end mold 2 respectively; and the two slurry discharging plates 8 are respectively arranged between the guiding steel end mold 2 and the adjusting plugging plate 9. A plurality of slurry discharging holes 81 are arranged on the slurry discharging plate 8. As the concrete delivery pipe 3 moves longitudinally for pouring, the floating slurry on the concrete surface is located in the front, and the floating slurry is effectively discharged through the slurry discharging holes 81 on the slurry discharging plate 8, avoiding the formation of a floating slurry soft layer in the concrete and resulting in quality problems.

[0055] The longitudinal pouring construction method for the tunnel crown area using the secondary lining trolley containing the pouring device 1 includes a pre-pouring preparation step, a pouring step on both sides of the tunnel, a crown pouring step and a form removal step, and the pre-pouring preparation step, the pouring step on both sides of the tunnel, the crown pouring step and the form removal step are carried out in sequence.

[0056] The pre-pouring preparation step is specifically as follows:

[0057] a. Refer to Figure 11 , in accordance with the tunnel design requirements, measure and adjust the position of the secondary lining trolley, and position the secondary lining trolley after calibration. The surface 042 of the secondary lining trolley near the end of the previously cast secondary lining is set on the previous version of the secondary lining, so that the panel 042 of the secondary lining trolley overlaps with the previous version of the secondary lining;

[0058] b. Install an annular plugging plate 06 and a guiding steel end form 2 at the end of the secondary lining trolley. The annular plugging plate 06 is corresponding to both sides of the non-vault area of the tunnel, and the guiding steel end form 2 is arranged at the position of the secondary lining trolley corresponding to the tunnel vault. The top of the guiding steel end form 2 is sealed tightly with an adjusting plugging plate 9. A guiding channel 21 is arranged on the guiding steel end form 2, and the guiding channel 21 corresponds to the central part of the vault area. The bracket section 41 in the bracket 4 holds up the concrete delivery pipe 3. The bracket 4 and the concrete delivery pipe 3 are driven by a perfusion driving assembly 6 to penetrate through the guiding channel 21 and extend longitudinally into the tunnel until the distance between the end of the concrete delivery pipe 3 close to the previous concrete and the end of the previous concrete is not less than 50 cm.

[0059] When driving the concrete delivery pipe 3 to extend deeply, it is necessary to confirm whether there are steel bars in the tunnel lining. If there are steel bars in the tunnel lining, it is necessary to accurately position and manage the process of the steel bars in the central part of the vault at the early stage of steel bar binding, and ensure that the area where the bracket is inserted is a neutral area for the steel bars, so that the bracket 4 and the concrete delivery pipe 3 can extend smoothly. If there are no steel bars in the secondary lining, this operation is not required.

[0060] Concreting steps for both sides of the tunnel:

[0061] c. Pour concrete into the non-vault areas on both sides of the tunnel. The pouring method for the non-vault areas can adopt the "vertical" pouring method or other traditional methods for pouring.

[0062] Concreting steps for the vault:

[0063] d. Connect the concrete delivery pipe 3 to the concrete conveying pump pipe and start the pumping construction of the concrete for the secondary lining vault.

[0064] e. Refer to Figure 12 , during the concrete pouring process, the perfusion driving assembly 5 drives the bracket 4 to move backward longitudinally along the guiding channel 21; during the backward movement of the concrete delivery pipe 3, it is necessary to observe the state and progress of the longitudinal pouring of the lining at any time through monitoring measures such as manual labor and cameras, and gradually disassemble the bracket section 41 while reasonably adjusting the progress of the longitudinal pouring.

[0065] f. Reasonably adjust the driving speed of the perfusion driving assembly according to the floating slurry discharge situation of the slurry discharge plate 8 at the end of the guiding steel end form 2, and prepare for the pipe pulling operation; after ensuring that the sealing section 25 in the secondary lining and the guiding channel 21 is filled with concrete, all the bracket sections 41 are pulled out to the switching baffle 61.

[0066] g. Refer to Figure 13 , stop the concrete pumping and immediately start the switching baffle 61 to close the sealing section 25.

[0067] The specific formwork removal steps are as follows:

[0068] h. After the lining concrete is poured, promptly clean the bracket 4 and the concrete delivery pipe 3 to avoid problems such as pipe blockage and concrete adhesion caused by too long time;

[0069] i. Refer to Figure 14 , after the concrete begins to set, remove the guiding steel end form 2 by disassembling the assembly 7. The two form removal driving devices 72 respectively drive the inner pipes of the sliding sleeves 71 connected to them to move. The inner pipes of the two sliding sleeves 71 move simultaneously, moving the guiding steel end form 2 on the support plate 73 away from the secondary lining until all the concrete in the sealing section 25 is exposed;

[0070] j. Refer to Figure 15 , after the overall strength of the lining concrete reaches the form removal condition of the trolley formwork, immediately carry out the removal work of all the formwork, and promptly chisel and appropriately polish the concrete column 251 formed in the sealing section 25 after demoulding;

[0071] k. Carry out the pouring of the next version of the secondary lining concrete.

[0072] Before the concrete pouring in the vault area of the secondary lining, an annular plug plate 06, an adjustable plug plate 9 and a pouring device 1 are arranged on the end head of the secondary lining trolley. The annular plug plate 06, the guiding steel end form 2 and the adjustable plug plate 9 form a tightly sealed surface on the secondary lining trolley. A slurry discharge plate is arranged on this tightly sealed surface for effective discharge of floating slurry. Before the concrete pouring in the vault area, the concrete delivery pipe 3 penetrates through the guiding channel 21 of the guiding steel end form 2 and extends longitudinally, so that the concrete delivery pipe 3 extends between the primary support 02 and the secondary lining trolley. During the pouring process, as the concrete delivery pipe 3 retreats longitudinally, the concrete is gradually poured through the concrete delivery pipe 3. Since the concrete delivery pipe 3 moves longitudinally along the tunnel, the floating slurry in the concrete is located in the front, enabling the floating slurry to be more effectively concentrated and discharged, and at the same time, the floating slurry will not be clamped near the waterproof layer, thus avoiding the existence of a floating slurry soft layer near the waterproof layer at the vault of the lining. Moreover, compared with the vertical pouring in the vault area, the longitudinal pouring in the vault area is more likely to fill the secondary lining with concrete, reduce the occurrence of voids, and further avoid the situation of the concrete layer not being compact. Furthermore, since the guiding channel 21 is outside the secondary lining, when the guiding channel 21 is filled with concrete, a concrete column 251 with a certain shape protruding from the concrete layer of the secondary lining is naturally formed, and at the same time, it can ensure that the concrete layer of the secondary lining is filled, and it can avoid the phenomenon of small slump of the concrete at this position when the concrete delivery pipe 3 is finally pulled out near the guiding steel end form 2, ensuring that the concrete at the end of the vault is integrally full and dense. When the guiding channel 21 in the guiding steel end form 2 is filled with concrete and the concrete pouring stops, the switching baffle 51 is quickly moved to cover the guiding channel 21 to achieve sealing. Without relying on manual plugging, it can avoid the formation of irregular pits after demoulding and the need to clean the stuffing objects, effectively improving the work efficiency.

[0073] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Longitudinal pouring device for the arch crown of secondary lining, Characterized in that, Comprising: A guiding steel end mold, a concrete delivery pipe, a pouring driving assembly and a switching baffle assembly. A guiding channel extending longitudinally is arranged in the guiding steel end mold. The concrete delivery pipe penetrates through the guiding channel. The pouring driving assembly drives the concrete delivery pipe to move longitudinally in the guiding channel. The switching baffle assembly includes a switching baffle and a baffle driving device. Along the radial direction of the guiding channel, the width of the switching baffle is greater than the width of the guiding channel. The baffle driving device drives the switching baffle to move towards or away from the guiding channel. The switching baffle covers the guiding channel; The switching baffle assembly is arranged inside the guiding steel end mold. A first installation chamber is arranged in the guiding steel end mold. The first installation chamber is arranged outside the guiding channel. The first installation chamber is communicated with the guiding channel. The switching baffle assembly is arranged in the first installation chamber. The switching baffle moves from the first installation chamber to the guiding channel; Sliding rails are arranged on the inner side wall of the first installation chamber. The switching baffle is connected with the sliding rails in a matching manner. The sliding rails extend along the radial direction of the guiding channel. The switching baffle moves along the extending direction of the sliding rails; The guiding channel includes a guiding pipe section and a sealing section. The guiding pipe section and the sealing section are connected longitudinally. The switching baffle is arranged between the guiding pipe section and the sealing section. The sealing section is conical. The axis of the sealing section extends longitudinally.

2. The longitudinal pouring device for the arch crown of secondary lining according to claim 1, Characterized in that: The pouring device includes a bracket. The bracket penetrates through the guiding channel. An arc-shaped lifting part is arranged on the bracket. The concrete delivery pipe is arranged on the arc-shaped lifting part; The bracket includes multiple bracket sections. Every two adjacent bracket sections are connected longitudinally.

3. The longitudinal pouring device for the arch crown of secondary lining according to claim 2, Characterized in that: The bracket includes multiple connecting components. Longitudinally, every two adjacent bracket sections are connected with the connecting components. The connecting components include fixing clips and at least two fixing bolts. The fixing clips are respectively connected with two adjacent bracket sections. At least one fixing bolt is simultaneously connected with the fixing clip and one of the bracket sections.

4. The longitudinal pouring device for the arch crown of secondary lining according to claim 1, Characterized in that: The pouring driving assembly includes a gear and a pouring driving device. The pouring driving device drives the gear to rotate. A rack is arranged on the concrete delivery pipe. The rack extends longitudinally. The rack meshes with the gear.

5. The longitudinal pouring device for the arch crown of secondary lining according to claim 4, Characterized in that: A second installation chamber is arranged in the guiding steel end mold. The second installation chamber is connected with the guiding channel. The pouring driving assembly includes a casing. The gear and the driving device are respectively arranged in the casing. One end of the gear penetrates through the casing and extends into the guiding channel.

6. The longitudinal pouring device for the secondary lining vault according to any one of claims 1 to 5, characterized in that: the pouring device includes a form removal assembly, the form removal assembly includes a sliding sleeve and a form removal driving device, the guiding steel end form is connected to the inner pipe of the sliding sleeve, and the form removal driving device drives the inner pipe of the sliding sleeve to move longitudinally.

7. Secondary lining trolley, characterized in that: it includes the longitudinal pouring device for the secondary lining vault according to any one of claims 1 to 6.

8. The secondary lining trolley according to claim 7, characterized in that: a circumferential plugging plate and the guiding steel end form are arranged on the end head of the secondary lining trolley, the guiding steel end form is arranged in the vault area of the secondary lining trolley, and the circumferential plugging plate is arranged along the circumference of the panel of the secondary lining trolley; a slurry discharge plate is arranged between the circumferential plugging plate and the guiding steel end form, and a plurality of slurry discharge holes are arranged on the slurry discharge plate.

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