Construction method of PC structure fabricated soil nailing wall

Abstract

The invention relates to the technical field of soil nailing wall construction, and discloses a construction method of a PC structure assembly type soil nailing wall, which comprises the following steps: S1, carrying out first-step earth excavation; s2, laying a first layer of PC structure panel; s3, a first layer of panel temporary support is installed; s4, back tie bar anchoring is carried out; s5, the first-step panel temporary support is dismantled; s6, first-step soil nail construction is carried out; s7, earth excavation in the second step; step S8, laying a second layer of PC structure panel; s9, a second layer of panel temporary support is installed; step S10, grouting the sleeve; step S11, dismantling the second-step panel temporary support; and S12, the steps from S7 to S11 are repeated until the designed elevation is reached. The use of on-site mixed concrete and sprayed concrete can be effectively reduced, the environment is protected to a great extent, and the health of constructors is guaranteed; the concrete mixing proportion can be accurately controlled, and the concrete construction quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil nail wall construction, and more particularly to a construction method of a PC structure assembled soil nail wall. Background Art

[0002] With the rapid development of urban construction, foundation pit projects are becoming deeper, larger, and more difficult, and the importance of foundation pit support has become increasingly prominent. At the same time, due to the rapid development of deep foundation pit engineering technology in recent years, the concept of green environmental protection and resource conservation has become increasingly stronger.

[0003] Traditional soil nail wall construction, due to technological limitations, requires extensive use of on-site mixed concrete. However, due to its significant environmental pollution, on-site mixed concrete has been on the list of prohibited materials in many regions for many years. In recent years, soil nail wall construction has mostly adopted a dry mix process with water added at the nozzle. While this avoids the environmental pollution caused by dry mix mixing, contamination during the concrete spraying process is unavoidable. Furthermore, the water-to-dry mix ratio cannot be effectively measured, making construction quality difficult to guarantee.

[0004] Therefore, it is necessary to propose a construction method for PC structure assembled soil nail wall to at least partially solve the problems existing in the existing technology and ensure green environmental protection and reliable quality during the construction process of soil nail wall. Summary of the Invention

[0005] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a construction method of a PC structure prefabricated soil nail wall, comprising the following steps: step S1, first excavation; step S2, laying a first layer of PC structure panels; step S3, installing temporary supports for the first layer of panels; step S4, anchoring back reinforcement; step S5, removing the temporary supports for the first layer of panels; step S6, first soil nailing construction; step S7, second excavation; step S8, laying a second layer of PC structure panels; step S9, installing temporary supports for the second layer of panels; step S10, sleeve grouting; step S11, removing the temporary supports for the second layer of panels; step S12, repeating steps S7 to S11 to the design elevation.

[0007] Preferably, in step S1, the first step of earth excavation should be to a point 0.3 m below the design elevation of the first soil nail.

[0008] Preferably, in step S2, a first layer of PC structural panels is laid, the upper portion of which has a 1m wide flange parallel to the ground, the first layer of PC structural panels fits the slope as closely as possible, and tongue-and-groove joints are used for transverse connections.

[0009] Preferably, in step S4, the back reinforcement reserved at the flange portion of the first layer of PC structural panel is fixed to the soil behind the slope using T-shaped reinforcement.

[0010] Preferably, in step S5, after all the back reinforcements are anchored, the first step of removing the temporary support of the panel is performed.

[0011] Preferably, in step S6, the first step is soil nail construction; soil nails should be inserted in time after the hole is formed, and grouting should be done in time; L-shaped soil nail reinforcement bars are set at the ends of the soil nails, and the soil nail reinforcement bars are connected to the soil nail main bars and transverse compression bars by lap welding. The lap length is not less than 10d when single-sided welding is used, and the lap length is not less than 5d when double-sided welding is used, where d is the diameter of the steel bar.

[0012] Preferably, in step S7, the excavation depth is adapted to the vertical spacing of the soil nails, and each step of the excavation should be excavated to 0.3 m below the design elevation of the corresponding soil nails.

[0013] Preferably, in step S8, before laying the second layer of PC structural panels, the length and position of the steel bars to be connected are checked to ensure that the sleeves and the steel bars are accurately aligned.

[0014] Preferably, in step S10, first, the grouting material is used to divide the compartments into reasonable intervals. After the division is completed, the premixed mortar is used to seal the compartments. Finally, grouting is carried out in sequence according to the order of division, and grouting is carried out from the joint grouting hole in the middle of each compartment. The grouting speed is set to 3L-5L / min.

[0015] Preferably, in step S11, after the grouting material reaches a strength grade compatible with the concrete surface layer, the temporary support of the second step panel is removed.

[0016] Preferably, each grouting position is provided with a connecting pipe, which extends out of the PC structural panel and is connected to the first transfer pipe at the bottom of the slurry fullness detection box.

[0017] The working principle and beneficial effects of the above technical solution are:

[0018] Preferably, a transfer assembly is provided between the connecting pipe and the first transfer pipe, and the transfer assembly includes:

[0019] The support plate has two threaded sleeves symmetrically connected on both sides of the support plate. The inner wall of the threaded sleeve is provided with a thread, and the end of the threaded sleeve is provided with a tapered cylinder;

[0020] The adapter screw is threaded into the threaded sleeve, one end of the adapter screw is connected to the rotating frame, and the other end corresponds to the threaded hole on the PC structure panel.

[0021] Preferably, the adapter assembly further includes:

[0022] The support frame is installed on the side of the support plate away from the PC structure panel, and an annular groove is provided at the end of the support frame;

[0023] The support sleeve is arranged on the inner side of the support frame, and an annular convex strip and a flange are respectively provided at both ends of the outer wall of the support sleeve. The annular convex strip is rotatably connected to the annular groove, and a plurality of notches are evenly provided on the flange; the inner wall of the support sleeve is provided with a thread;

[0024] The adapter tube sleeve is installed on the outside of the first adapter tube and is screwed to the inner wall of the support sleeve. A guide bar is provided on the side of the adapter tube sleeve close to the PC structure panel. The guide bar is inserted and slidably set in the guide groove of the support frame. Both the guide bar and the guide groove are arranged along the axial direction of the first adapter tube;

[0025] The second transfer tube is arranged at the center of the support frame, and both ends of the second transfer tube are respectively connected to the connecting pipe and the first transfer tube.

[0026] Preferably, a first disc is connected to the center of the support frame, and the second adapter tube is connected to the center of the first disc;

[0027] The first disc is evenly provided with a plurality of first guide grooves along the circumferential direction, the center line of the first guide groove passes through the center of the first disc, and the side walls of the first guide groove are provided with limiting sliding grooves;

[0028] A guide column is slidably connected in the first disc, a limit slider is provided on the side wall of the guide column, the limit slider is slidably connected in the limit sliding groove, and the guide column is connected to the exhaust component.

[0029] Preferably, a second disc is rotatably provided on a side of the first disc away from the PC structural panel, and a plurality of second guide grooves are evenly provided on the second disc along the circumferential direction. The second guide grooves are arranged in an arc shape, and the guide posts are slidably connected in the second guide grooves.

[0030] A plurality of clamping blocks are provided on one side of the second disc away from the PC structure panel;

[0031] The end of the first transfer tube is connected to a gear ring, and the gear ring is provided with a plurality of bayonet holes, and the clamping blocks are provided correspondingly to the bayonet holes;

[0032] A driving gear is meshedly connected to the gear ring, and the driving gear is rotatably connected to the end of the first transfer tube. The driving gear shaft is connected to the motor, and the motor is installed in the tube wall of the end of the first transfer tube; a pipe opening corresponding to the second transfer tube is provided at the center of the first transfer tube.

[0033] Preferably, the exhaust assembly comprises:

[0034] Support arms, wherein the plurality of support arms are evenly connected to the outer wall of the second transfer tube;

[0035] The support plate is connected to one end of the guide column close to the PC structure panel, and a waist-shaped groove is provided on the support plate;

[0036] The middle part of the rotating arm is hinged to the support plate, and one end of the rotating arm is hingedly arranged in the waist-shaped groove of the support plate;

[0037] The exhaust plate is telescopically connected to the other end of the rotating arm.

[0038] Preferably, the exhaust assembly further comprises:

[0039] Shell, multiple shells are evenly connected to one end of the exhaust plate close to the PC structure panel;

[0040] A rotating shaft, the rotating shaft is simultaneously rotatably connected to the housing;

[0041] Rollers, which are connected to both ends of the shaft and are covered with a rubber layer;

[0042] A cam connected to the rotating shaft;

[0043] A pressure plate is slidably connected to the housing, one side of the pressure plate is connected to the inner wall of the housing through a spring, and the other side presses on the cam surface;

[0044] A knocking rod is connected to the pressure plate and extends out of the shell, and a knocking ball is connected to the end of the knocking rod.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] The present invention provides a construction method for a PC structure assembled soil nail wall.

[0047] By using PC structure prefabricated soil nail walls instead of traditional soil nail walls, the use of on-site mixed concrete and shotcrete can be effectively reduced, protecting the environment to a great extent and ensuring the health of construction workers.

[0048] PC structural panels are prefabricated in the factory, which can accurately control the concrete mix ratio, improve the quality of concrete construction, and effectively save the waiting time for concrete to solidify and harden, thereby saving construction time.

[0049] PC structure prefabricated soil nail wall can effectively reduce the difficulty of shotcrete curing, solve the problem of difficulty in heat preservation of the living surface of soil nail wall during winter construction, thereby reducing the difficulty of construction.

[0050] The PC structural panels are designed in layers with soil nails, and are installed in layers, which can effectively prevent over-excavation and other rough construction phenomena that affect construction safety.

[0051] The use of PC structure prefabricated soil nail walls can significantly reduce the amount of labor required on the construction site and is more economical and reasonable.

[0052] The construction method of a PC structure assembled soil nail wall described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0054] Figure 1 This is a flow chart of the construction method of the present invention;

[0055] Figure 2 This is a schematic diagram of the installation of the first layer of PC structure panels in the present invention;

[0056] Figure 3 Schematic diagram of the transverse tongue-and-groove seam in the present invention;

[0057] Figure 4 Schematic diagram of the soil nail end in the present invention;

[0058] Figure 5 Schematic diagram of the grouting sleeve in the present invention;

[0059] Figure 6 Schematic diagram of the installation structure of the slurry fullness detection box in the present invention;

[0060] Figure 7 Schematic diagram of the structure of the adapter assembly in the present invention;

[0061] Figure 8 Schematic diagram of the cross-sectional structure of the adapter assembly in the present invention;

[0062] Figure 9 Schematic diagram of the structure of the second disc in the present invention;

[0063] Figure 10 This is a schematic structural diagram of the end portion of the first transfer tube in the present invention;

[0064] Figure 11 A schematic diagram of the partial structure of the exhaust assembly in the present invention;

[0065] Figure 12 It is a schematic diagram of the cross-sectional structure of the shell in the present invention.

[0066] Figure: 1. Foundation pit slope; 2. Steel mesh; 3. PC structural panel; 4. Flanged edge; 5. Back tie bar; 6. T-shaped bar; 7. Soil nail main bar; 8. Transverse compression bar; 9. Steel bars to be connected; 10. Tongue-and-groove joint; 11. Soil nail reinforcement bar; 12. Sleeve; 13. Grouting hole; 14. Overflow hole; 21. Connecting pipe; 22. Slurry fullness detection box; 23. First transfer pipe; 24. Support plate; 25. Sleeve; 26. Conical cylinder; 27. Transfer screw; 28. Rotating frame; 31. Support frame; 32. Annular groove; 33. Support sleeve; 34. Annular ridge; 35 . Flange; 36. Adapter sleeve; 37. Guide strip; 38. Guide groove; 39. Second adapter tube; 41. First disc; 42. First guide groove; 43. Limit slide; 44. Guide column; 45. Limit slider; 46. Second guide groove; 47. Block; 48. Gear ring; 49. Bayonet; 50. Second disc; 51. Drive gear; 52. Pipe mouth; 53. Support arm; 54. Support plate; 55. Rotating arm; 56. Exhaust plate; 57. Housing; 58. Rotating shaft; 59. Roller; 61. Cam; 62. Pressure plate; 63. Knocking rod; 64. Knocking ball. DETAILED DESCRIPTION

[0067] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0068] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0069] Example 1:

[0070] like Figure 1-Figure 5 As shown, the present invention provides a construction method of a PC structure assembled soil nail wall, comprising the following steps:

[0071] Step S1, the first step of earth excavation; the first step of earth excavation should be excavated to 0.3m below the design elevation of the first soil nail, and the slope should be trimmed to the designed slope ratio using small machinery supplemented by manual work. Over-excavation and disturbance of the slope soil are strictly prohibited.

[0072] Step S2: Lay the first layer of PC structural panels 3. The upper portion of the first layer of PC structural panels 3 has a flange 4 approximately 1 meter wide and parallel to the ground (the concrete structural surface slopes toward the outside of the foundation pit at a ratio of 1:0.02). The first layer of PC structural panels 3 conforms closely to the foundation pit slope 1, which is provided with a steel mesh 2. Tongue-and-groove joints 10 are used for transverse connection of the first layer of PC structural panels 3. PC structural panels 3 are prefabricated prefabricated concrete structural panels.

[0073] Step S3, installing temporary support for the first layer of panels; it is only used to temporarily fix the first layer of PC structural panels 3 before the back reinforcement 5 is anchored.

[0074] Step S4, anchoring the back reinforcement 5; fixing the back reinforcement 5 reserved at the flange 4 of the first layer of PC structural panel 3 to the soil behind the slope with T-shaped reinforcement 6.

[0075] Step S5, removing the temporary support of the first panel; after all the back reinforcements 5 are anchored, the temporary support of the first panel is removed.

[0076] Step S6, the first step of soil nailing construction; soil nails should be inserted and grouting should be done in time after the holes are formed; L-shaped soil nail reinforcement bars 11 are set at the ends of the soil nails, and the soil nail reinforcement bars 11 are connected to the soil nail main bars 7 and the transverse compression bars 8 by lap welding. The lap length is not less than 10d when single-sided welding is used, and the lap length is not less than 5d when double-sided welding is used, where d is the diameter of the steel bar.

[0077] Step S7, the second step of earth excavation; the earth excavation depth is adapted to the vertical spacing of the soil nails, and each step of earth excavation should be excavated to 0.3m below the design elevation of the corresponding soil nails.

[0078] Step S8, laying the second layer of PC structural panels 3; before laying the second layer of PC structural panels 3, check the length and position of the steel bars 9 to be connected to ensure that the sleeves 12 are accurately aligned with the steel bars.

[0079] Step S9, installing temporary support for the second step panel;

[0080] Step S10, grouting of the sleeve 12; first, use sealing grouting material to divide the compartments at a reasonable interval (the maximum distance between any two sleeves 12 in each connected grouting cavity area should not exceed 1.5m, and the sleeves 12 should be staggered with the soil nails). After the compartments are divided, use special premixed mortar to seal the compartments (seal the gaps between the upper and lower PC structural panels 3), and finally grouting is carried out in sequence according to the compartment order, and grouting is carried out from the joint grouting hole 13 in the middle of each compartment, and the grouting speed is set to 3L-5L / min. If the grouting speed is too fast, it is easy to cause too much air in the cavity, causing the slurry to fall back after filling. If the grouting speed is too slow, it is easy to cause insufficient pressure and the edge sleeve 12 is not fully filled. If slurry falls back, grouting is carried out in time. An overflow hole 14 is provided on the upper part of the sleeve 12.

[0081] Step S11, removing the temporary support of the second-step panel; after the grouting material reaches a strength grade that is compatible with the concrete surface layer, the temporary support of the second-step panel is removed.

[0082] Step S12, repeat steps S7 to S11 to the design elevation.

[0083] The beneficial effects of the above technical solution are:

[0084] The present invention provides a construction method of a PC structure assembled soil nail wall.

[0085] By using PC structure prefabricated soil nail walls instead of traditional soil nail walls, the use of on-site mixed concrete and shotcrete can be effectively reduced, protecting the environment to a great extent and ensuring the health of construction workers.

[0086] The PC structural panel 3 is prefabricated in the factory, which can accurately control the concrete mix ratio, improve the quality of concrete construction, and effectively save the waiting time for concrete to solidify and harden, thereby saving construction time.

[0087] PC structure prefabricated soil nail wall can effectively reduce the difficulty of shotcrete curing, solve the problem of difficulty in heat preservation of the living surface of soil nail wall during winter construction, thereby reducing the difficulty of construction.

[0088] The PC structural panel 3 is designed in layers with soil nailing design elevation and installed in layers, which can successfully prevent over-excavation and other rough construction phenomena that affect construction safety.

[0089] The use of PC structure prefabricated soil nail walls can significantly reduce the amount of labor required on the construction site and is more economical and reasonable.

[0090] Example 2:

[0091] like Figure 6-Figure 12 As shown, based on the above embodiment 1, a connecting pipe 21 is provided on each grouting position. The connecting pipe 21 extends out of the PC structure panel 3 and is connected to the first transfer pipe 23 at the bottom of the slurry fullness detection box 22.

[0092] The working principle and beneficial effects of the above technical solution are:

[0093] A connecting pipe 21 is provided on the grouting position, and the slurry enters the slurry fullness detection box 22 through the connecting pipe 21 and the first transfer pipe 23. The slurry fullness detection box 22 is an existing technology and can adopt the slurry fullness detection box structure in the patent document with publication number CN115506600B to detect whether the concrete pressure of the grouting material meets the standard, provide a basis for the grouting process, and ensure the forming quality of the soil nail wall.

[0094] Example 3:

[0095] On the basis of the above-mentioned embodiment 2, a transfer assembly is provided between the connecting pipe 21 and the first transfer pipe 23, and the transfer assembly includes:

[0096] The support plate 24 has two threaded sleeves 25 symmetrically connected on both sides of the support plate 24. The inner wall of the threaded sleeve 25 is provided with a thread, and the end of the threaded sleeve 25 is provided with a tapered cylinder 26. The connecting pipe 21 and the first transfer pipe 23 are connected to the center of the support plate 24;

[0097] The adapter screw 27 is threaded into the threaded sleeve 25 , one end of the adapter screw 27 is connected to the rotating frame 28 , and the other end corresponds to the threaded hole on the PC structure panel 3 .

[0098] The working principle and beneficial effects of the above technical solution are:

[0099] The existing slurry fullness detection box 22 is directly screwed to the connecting pipe via an adapter tube during use. Under the pressure of the concrete slurry, the threads may slip, resulting in a connection failure and concrete slurry leakage. Therefore, an adapter assembly is provided. During installation, the connecting pipe 21 and the first adapter tube 23 are connected at the center of the support plate 24. The threaded sleeves 25 on both sides of the support plate 24 are aligned with the threaded holes on the PC structure panel 3. The rotating frame 28 is rotated to unscrew the adapter screw 27 from the threaded sleeve 25 and screw it into the threaded hole on the PC structure panel 3.

[0100] The above structural design utilizes two left and right adapter screws 27 for threaded connection, allowing the central connecting tube 21 to connect to the first adapter tube 23. Compared to direct threading onto the connecting tube, this reduces the impact of loose threads on the sealing of the joint, preventing slurry leakage under the pressure of the concrete slurry. A tapered tube 26 is provided at the end of the threaded sleeve 25, which presses against the PC structural panel 3, increasing the load-bearing area and improving structural stability. This prevents cantilever deformation caused by the weight of the slurry within the slurry fullness detection box 22.

[0101] Example 4:

[0102] Based on the above embodiment 2, the adapter assembly further includes:

[0103] Support frame 31, support frame 31 is installed on the side of support plate 24 away from PC structure panel 3, and an annular groove 32 is provided at the end of support frame 31;

[0104] The support sleeve 33 is arranged on the inner side of the support frame 31. The outer ends of the support sleeve 33 are respectively provided with an annular ridge 34 and a flange 35. The annular ridge 34 is rotatably connected to the annular groove 32. The flange 35 is evenly provided with a plurality of notches. The inner wall of the support sleeve 33 is provided with a thread.

[0105] The adapter tube sleeve 36 is installed on the outside of the first adapter tube 23 and is screwed to the inner wall of the support sleeve 33. A guide bar 37 is provided on the side of the adapter tube sleeve 36 close to the PC structural panel 3. The guide bar 37 is inserted and slidably set in the guide groove 38 of the support frame 31. The guide bar 37 and the guide groove 38 are both arranged axially along the first adapter tube 23.

[0106] The second transfer tube 39 is disposed at the center of the support frame 31 , and both ends of the second transfer tube 39 are connected to the connecting tube 21 and the first transfer tube 23 respectively.

[0107] The working principle and beneficial effects of the above technical solution are:

[0108] When the adapter assembly is in use, the second adapter tube 39 in the center connects to the connecting tube 21 and the first adapter tube 23. After the support frame 31 is secured, the second adapter tube 39 is sheathed onto the connecting tube 21 and sealed. When installing the first adapter tube 23, it is fixed to the adapter tube sleeve 36, which is then inserted into the support sleeve 33. The guide bar 37 is inserted into the guide groove 38 of the support frame 31 and can slide relative to it. The guide groove 38 and the guide bar 37 limit the movement direction of the adapter tube sleeve 36. The support sleeve 33 is then rotated, and the support sleeve 33 and the adapter tube sleeve 36 are threaded together, causing the adapter tube sleeve 36 to move toward the PC structural panel 3. This in turn moves the first adapter tube 23 until it sheathes onto the second adapter tube 39 and seals it. This creates a passageway between the connecting tube 21, the second adapter tube 39, and the first adapter tube 23, allowing the concrete slurry in the storage bin to flow through the passageway to the slurry fullness detection box 22. The flange 35 is provided with a plurality of notches to facilitate rotation.

[0109] Through the above-mentioned structural design, the first adapter tube 23 is fixed by connecting the adapter sleeve 36 with the support sleeve 33, so that the first adapter tube 23 and the second adapter tube 39 are socketed and sealed. Compared with the method of directly screwing the adapter tube, the effect of loose threads on the sealing of the connection can be reduced, and the problem of slurry leakage under the action of concrete slurry pressure can be prevented, and the structural stability is better.

[0110] Example 5:

[0111] On the basis of the above-mentioned embodiment 4, the center of the support frame 31 is connected to the first disc 41, and the second transfer tube 39 is connected to the center of the first disc 41;

[0112] The first disc 41 is evenly provided with a plurality of first guide grooves 42 along the circumferential direction. The center line of the first guide groove 42 passes through the center of the first disc 41. The sidewalls of the first guide groove 42 are provided with limiting sliding grooves 43.

[0113] A guide post 44 is slidably connected in the first disc 41 . A limit slider 45 is provided on the side wall of the guide post 44 . The limit slider 45 is slidably connected in the limit slot 43 . The guide post 44 is connected to the exhaust assembly.

[0114] The working principle and beneficial effects of the above technical solution are:

[0115] A guide post 44 is slidably disposed within the first guide groove 42 of the first disc 41. A limiting slider 45 on the guide post 44 is slidably connected to the limiting groove 43, limiting the axial position of the guide post 44. When the guide post 44 moves within the first guide groove 42, it activates the exhaust assembly to exhaust the slurry near the connecting pipe 21.

[0116] Example 6:

[0117] On the basis of the above embodiment 5, a second disc 50 is rotatably provided on the side of the first disc 41 away from the PC structural panel 3. The second disc 50 is evenly provided with a plurality of second guide grooves 46 along the circumferential direction. The second guide grooves 46 are arranged in an arc shape, and the guide posts 44 are slidably connected in the second guide grooves 46.

[0118] A plurality of blocks 47 are provided on one side of the second disc 50 away from the PC structural panel 3;

[0119] The end of the first transfer tube 23 is connected to a gear ring 48, and a plurality of bayonet holes 49 are provided on the gear ring 48, and the clamping blocks 47 are provided corresponding to the bayonet holes 49;

[0120] A drive gear 51 is meshedly connected to the gear ring 48, and the drive gear 51 is rotatably connected to the end of the first transfer tube 23. The rotating shaft of the drive gear 51 is connected to the motor, and the motor is installed in the tube wall of the end of the first transfer tube 23; a pipe opening 52 corresponding to the second transfer tube 39 is provided in the center of the first transfer tube 23.

[0121] The working principle and beneficial effects of the above technical solution are:

[0122] After the first transfer tube 23 and the second transfer tube 39 are fitted together and installed, the latch 49 on the toothed ring 48 at the end of the first transfer tube 23 corresponds to and engages with the latch 47 on the second disc 50, securing the toothed ring 48 to the second disc 50. The motor is started so that its output drives the drive gear 51 shaft to rotate, which in turn drives the toothed ring 48, which in turn drives the first disc 41 to rotate synchronously. Because the second guide groove 46 on the first disc 41 is arcuate, it drives the guide post 44 to move. Guided by the first guide groove 42, the guide post 44 moves along the first guide groove 42. The motor is set to rotate in alternating forward and reverse directions, causing the toothed ring 48 to rotate in alternating forward and reverse directions, thereby driving the guide post 44 to move alternately inward and outward along the first guide groove 42, achieving reciprocating drive of the exhaust assembly.

[0123] Example 7:

[0124] Based on the above embodiment 6, the exhaust assembly includes:

[0125] Support arms 53, multiple support arms 53 are evenly connected to the outer wall of the second transfer tube 39;

[0126] The support plate 54 is connected to the end of the guide column 44 close to the PC structure panel 3, and the support plate 54 is provided with a waist-shaped groove;

[0127] The pivot arm 55 is hinged at its middle portion to the support plate 54, and one end of the pivot arm 55 is hingedly disposed in a waist-shaped groove of the support plate 54;

[0128] The exhaust plate 56 is telescopically connected to the other end of the rotating arm 55.

[0129] The working principle and beneficial effects of the above technical solution are:

[0130] When the exhaust assembly is in operation, the support plate 54 moves synchronously with the movement of the guide post 44. The support plate 54 drives one end of the rotating arm 55 to rotate, causing the exhaust plate 56 at the other end of the rotating arm 55 to rotate, and the exhaust plate 56 moves on the PC structural panel 3. The exhaust plate 56 is telescopically arranged on the rotating arm 55 and is maintained in an extended position by an elastic member such as a spring, so that it maintains pressure on the PC structural panel 3. When the exhaust plate 56 moves, it helps to push the slurry near the connecting pipe 21 toward the connecting pipe 21, so that the slurry in the bin can flow better into the connecting pipe 21, the connection effect is better, and the PC structure panel 3 near the connecting pipe 21 is smoothed to prevent excessive local pressure from causing bulging; when the exhaust plate 56 is expanded outward to the maximum angle, the exhaust plate 56 is separated from the PC structure panel 3; when it contacts again, it will vibrate, expelling the air in the slurry near the connecting pipe 21, and vibrating the slurry here to make it dense; compared with the method of vibrating and exhausting the PC structure panel 3 as a whole after grouting in the prior art, it can continuously strengthen the vibration of the slurry near the connecting pipe 21 during the grouting process, and prevent the problem that air enters the connecting pipe 21 during the grouting process and cannot be effectively eliminated during subsequent vibrations, thereby reducing the influence of pores and gaps on the slurry fullness detection and improving the detection accuracy.

[0131] Example 8:

[0132] Based on the above embodiment 7, the exhaust assembly further includes:

[0133] Shell 57, multiple shells 57 are evenly connected to one end of the exhaust plate 56 close to the PC structural panel 3;

[0134] The rotating shaft 58 is simultaneously rotatably connected to the housing 57;

[0135] Roller 59, roller 59 is connected to both ends of the rotating shaft 58, and the roller 59 is wrapped with a rubber layer;

[0136] Cam 61, cam 61 is connected to the rotating shaft 58;

[0137] The pressure plate 62 is slidably connected to the housing 57. One side of the pressure plate 62 is connected to the inner wall of the housing 57 through a spring, and the other side presses on the surface of the cam 61;

[0138] The knocking rod 63 is connected to the pressure plate 62 and extends out of the housing 57 , and a knocking ball 64 is connected to the end of the knocking rod 63 .

[0139] The working principle and beneficial effects of the above technical solution are:

[0140] As the exhaust plate 56 moves on the PC structural panel 3, the rollers 59 on both sides roll under the action of friction. Because the rollers 59 are covered with a rubber layer, they can reduce damage to the PC structural panel 3. When the rollers 59 rotate, they drive the rotating shaft 58 to rotate, and the cam 61 on the rotating shaft 58 rotates. Because the distance between the surface of the cam 61 and the axis of the rotating shaft 58 varies, the pressure plate 62 is pushed to slide back and forth on the inner wall of the housing 57. The pressure plate 62 drives the knocking rod 63 to move, so that the knocking ball 64 intermittently contacts the PC structural panel 3, achieving knocking on the PC structural panel 3, generating more intensive vibration waves, and improving the exhaust effect on the slurry.

[0141] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0142] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0143] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A construction method for a PC structure assembled soil nail wall, characterized in that: The following steps are involved: Step S1, the first step of earth excavation; Step S2, laying the first layer of PC structural panels (3); Step S3, installing temporary support for the first layer of panels; Step S4, anchoring the back reinforcement (5); Step S5, removing the temporary support for the first step of panels; Step S6, the first step of soil nailing; Step S7, the second step of earth excavation; Step S8, laying the second layer of PC structural panels (3); Step S9, installing temporary support for the second layer of panels; Step S10, grouting the sleeve (12); Step S11, removing the temporary support for the second step of panels; Step S12, repeating steps S7 to S11 to the design elevation.

2. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S1, the first step of earth excavation should be to a point 0.3 m below the design elevation of the first soil nail.

3. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S2, a first layer of PC structural panels (3) is laid, and the upper portion of the first layer of PC structural panels (3) is provided with a 1m wide flange (4) parallel to the ground. The first layer of PC structural panels (3) fits the slope as closely as possible, and tongue-and-groove joints (10) are used for transverse connection.

4. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S4, the back reinforcement (5) reserved at the flange (4) of the first layer of PC structural panel (3) is fixed to the soil behind the slope using T-shaped reinforcement (6).

5. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S5, after all the back reinforcements (5) are anchored, the first step of removing the temporary support of the panel is carried out.

6. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S6, the first step is soil nailing. After the hole is formed, the soil nail should be inserted in time and grouting should be done in time. An L-shaped soil nail reinforcement bar (11) is provided at the end of the soil nail. The soil nail reinforcement bar (11) is connected to the soil nail main bar (7) and the transverse compression bar (8) by lap welding. The lap length is not less than 10d when single-sided welding is used, and not less than 5d when double-sided welding is used, where d is the diameter of the steel bar.

7. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S7, the excavation depth is adapted to the vertical spacing of the soil nails, and each step of the excavation should be excavated to 0.3 m below the design elevation of the corresponding soil nails.

8. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S8, before laying the second layer of PC structural panels (3), the length and position of the steel bars (9) to be connected are checked to ensure that the sleeves (12) are accurately aligned with the steel bars.

9. The construction method of a PC structure assembled soil nail wall according to claim 1, characterized in that: In step S10, first, the compartments are divided into sections at reasonable intervals using sealing mortar. After the division is completed, the compartments are sealed using premixed mortar. Finally, grouting is performed in sequence according to the order of the divisions. Grouting is performed from the joint grouting hole (13) in the middle of each compartment, and the grouting speed is set to 3L-5L / min.

10. The construction method of a PC structure assembled soil nail wall according to claim 6, characterized in that: In step S11, after the grouting material reaches a strength grade suitable for the concrete surface layer, the temporary support of the second step panel is removed.

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