Variable-diameter full-circle needle beam trolley and lining construction method

Abstract

The invention discloses a variable-diameter full-circle needle beam trolley and a lining construction method, belongs to the technical field of underground engineering construction, and solves the problems that the construction cost and the construction organization difficulty are increased, the construction period is prolonged and the construction cost is reduced because a plurality of steel mould trolleys with different diameters need to be manufactured when a traditional full-circle needle beam trolley is used for tunnel engineering needing to be reduced. The appearance quality of the structure is influenced by frequent replacement of the trolley, and the construction efficiency is reduced. Comprising a needle beam assembly, a beam frame assembly, a template assembly and a reducing mechanism, and the beam frame assembly is communicated with the template assembly. According to the variable-diameter full-circle needle beam trolley and the lining construction method, the variable diameter of the trolley is achieved by increasing or decreasing the widening blocks, the trolley adapts to construction of tunnels with different diameters, the flexibility and efficiency are improved, full-circle one-time forming skip warehouse continuous construction is adopted, the progress is accelerated, the cost is reduced, and in the long-distance tunnel construction, the trolley is reasonable in design, a formwork is stable, and the construction efficiency is improved. Concrete pouring is compact, and quality and progress are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and in particular to a variable-diameter full-circular needle beam trolley and a lining construction method. Background Art

[0002] A tunnel is a water passage excavated in a mountain or underground, and is often used for water delivery or flood discharge in water conservancy projects. According to their different tasks, they can be divided into discharge tunnels and discharge tunnels. The discharge tunnel is used to discharge the water required for irrigation, power generation and water supply from the reservoir; the discharge tunnel is used to discharge part of the flood in coordination with the spillway, discharge the tail water of the hydropower station, empty the reservoir for the maintenance of hub buildings or for war preparations, and discharge sand. The tunnel is mainly composed of three parts: the inlet building, the tunnel body section and the outlet building. The inlet building includes the water inlet bell mouth, the gate and its control building, etc., which are used to inlet water and control the water flow; the tunnel body is the main body of the tunnel, and its cross-sectional form and size depend on the water flow conditions, construction technology and application requirements; the outlet building is equipped with energy dissipation and anti-scouring facilities. The water flow with a free water surface in the tunnel is called a pressureless tunnel, and the water flow that fills the entire cross-section and makes the tunnel wall bear a certain water pressure is called a pressurized tunnel.

[0003] With the rapid development of underground engineering in Chinese cities, many water conservancy projects have adopted tunnels for water diversion and drainage. During the tunnel construction process, especially when encountering complex geological conditions such as weathering troughs and fault zones, the situation becomes particularly difficult. In order to ensure the stability of the tunnel structure, it is often necessary to carefully calculate and use linings of different thicknesses according to different geological conditions. In addition, the tunnel lining project occupies a pivotal position in the entire tunnel construction. It is not only related to the safety and quality of the construction process, but also directly affects the later operation quality of the tunnel and the safety of the engineering entity. Therefore, from construction to later maintenance, every link must be strictly controlled to ensure that the tunnel can serve the water conservancy project in a long-term and stable manner.

[0004] When faced with tunnel projects that require diameter changes, traditional full-circle needle beam trolleys usually need to manufacture multiple steel mold trolleys of different diameters. This not only increases construction costs and construction organization difficulties, but also prolongs the construction period. In addition, frequent replacement of trolleys affects the appearance quality of the structure and reduces construction efficiency.

[0005] Therefore, it is of great significance to develop a variable-diameter full-circular needle beam trolley and a construction method thereof that can adapt to the construction of tunnels of different diameters.

[0006] Therefore, a variable diameter full-circular needle beam trolley and a lining construction method are proposed to solve or alleviate the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a variable diameter full-circular needle beam trolley and a lining construction method.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A variable diameter full-circle needle beam trolley comprises a needle beam assembly, a beam frame assembly, a template assembly, and a diameter-changing mechanism. The beam frame assembly and the template assembly are connected and arranged, and the needle beam assembly can be slidably arranged in the beam frame assembly and the template assembly. The diameter-changing mechanism is arranged in the template assembly, and the diameter-changing mechanism can adjust the diameter of the template assembly.

[0010] Preferably, the needle beam assembly includes a plurality of U-shaped steel structure frames which are arranged equidistantly in the transverse direction, and connecting steels are fixedly connected between adjacent steel structure frames, and steel rails are fixedly connected to the outer sides of the connecting steels. The needle beam assembly also includes a lifting mechanism arranged on the ground, and the bottoms of the first and last steel structure frames are arranged on the lifting end of the lifting structure.

[0011] Preferably, the beam-frame assembly comprises a frame beam.

[0012] Preferably, the template assembly includes a top template, a left template, a right template, a lower left template, a lower right template, and a bottom template. The top template, the left template, the right template, the lower left template, the lower right template, and the bottom template can form a closed-loop structure connected end to end. The left template and the right template are respectively hinged to the two sides of the top template, the side of the left template away from the top template is hinged to the lower left template, and the side of the right template away from the top template is hinged to the lower right template. The bottom template is fixedly connected to the bottom of the frame beam, and the two sides of the bottom template can be hinged to the lower left template and the lower right template respectively. The hinges between the bottom template, the lower left template and the lower right template can also be detachably arranged, and the spacing between the top template, the left template, the right template, the lower left template, the lower right template, and the bottom template and the frame beam can be adjusted.

[0013] Preferably, the diameter-changing mechanism comprises a widening block, and the widening block is detachably connected between the lower left template and the bottom template, and between the lower right template and the bottom template.

[0014] Preferably, it also includes an adjustment mechanism, which is arranged between the beam frame assembly and the template assembly, and the adjustment mechanism adjusts the orientation of the beam frame assembly and the template assembly to complete the centering adjustment of the template assembly.

[0015] Preferably, it also includes a winch and traction mechanism, which is arranged on the needle beam assembly, and a fixed pulley is arranged on the top of the steel structure frame and on the side away from the winch and traction mechanism. The wire rope in the winch and traction mechanism is connected to the frame beam after passing through the fixed pulley, and the winch and traction mechanism is used to drive the needle beam assembly and the frame beam to slide relative to each other.

[0016] Preferably, it also includes an anti-floating device, which includes a vertical anti-floating jack and a horizontal anti-floating jack. The vertical anti-floating jack and the horizontal anti-floating jack are respectively installed at the front and rear ends of the mold assembly and connected to the frame beam.

[0017] Preferably, it further comprises an electrical system, which is electrically connected to the adjustment mechanism, the hoisting and traction mechanism, and the anti-floating device, and the electrical system controls the operation of the adjustment mechanism, the hoisting and traction mechanism, and the anti-floating device.

[0018] The present invention also provides a lining construction method of a variable diameter full-circular needle beam trolley, using the variable diameter full-circular needle beam trolley as described above, comprising the following steps:

[0019] Trolley design and layout: Design and arrange the variable diameter full-circle needle beam trolley according to the tunnel design parameters and construction requirements;

[0020] Rebar construction: Carry out the construction of side and top arch positioning reinforcement and reinforcement in the tunnel according to the design requirements to ensure that the reinforcement is firmly tied and evenly spaced;

[0021] Slag removal and preparation: clean up the slag and debris in the tunnel to prepare for concrete pouring, and check whether all parts of the trolley are installed in place;

[0022] Demoulding, applying release agent and positioning: After the concrete strength reaches the design requirements, demoulding operation is carried out and release agent is applied. The pouring position is determined by measuring the placement points, and the trolley is positioned using the hydraulic system;

[0023] Formwork support and concrete pouring: After the formwork is supported, concrete pouring is carried out. During the pouring process, the pouring speed and vibration intensity are controlled to ensure that the concrete is dense and free of bubbles;

[0024] Diameter change of the trolley: according to the change of tunnel diameter, the diameter of the trolley template can be adjusted by adding or removing the widening block of the bottom template, replacing the left and right side template ear hole plates and adjusting the support height of the top template to achieve rapid diameter change;

[0025] Skip-bin construction and backfill grouting: The double-trolley skip-bin construction method is adopted, and the two sets of full-circle trolleys are arranged in a "one jump and one clamp" manner. The concrete pouring sequence is 2-4-6 for trolley No. ①; 1-3-5-7 for trolley No. ②. After the lining concrete construction is completed, backfill grouting is carried out to ensure that the primary support and the lining are full and dense.

[0026] The present invention has the following beneficial effects:

[0027] (1) The variable diameter full-circle needle beam trolley provided by the present invention can achieve variable diameter by adding or removing widening blocks on both sides of the bottom template, which can adapt to the lining construction requirements of tunnels with different diameters, thereby improving construction flexibility and efficiency;

[0028] (2) The lining construction method of the present invention adopts a full-circle one-time forming skip-bin continuous construction method, which speeds up the construction progress, reduces the construction interruption time, and reduces the construction cost;

[0029] (3) The present invention has shown significant advantages in long-distance tunnel construction. The trolley is reasonably designed, the formwork is firmly supported, and the concrete is poured densely without bubbles, which ensures the construction quality and progress, and provides an efficient, economical and reliable construction method for tunnel construction under similar conditions.

[0030] (4) The present invention is suitable for lining construction of multi-diameter tunnels under complex geological conditions and has strong adaptability and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 The structure of the variable diameter full-circle needle beam trolley in the present invention is schematically shown. Figure 1 ;

[0033] Figure 2 It is an expanded layout diagram of the template assembly in the present invention;

[0034] Figure 3 The structure of the variable diameter full-circle needle beam trolley in the present invention is schematically shown. Figure 2 ;

[0035] Figure 4 This is a schematic diagram of the variable-diameter full-circular needle beam trolley before the diameter is changed in the present invention;

[0036] Figure 5 It is a schematic diagram of the variable diameter full-circle needle beam trolley of the present invention;

[0037] Figure 6 It is a schematic diagram of the variable-diameter full-circle needle beam trolley after the diameter is changed in the present invention;

[0038] Figure 7 It is a schematic diagram of double-platform skip-bin casting of the variable-diameter full-circular needle beam trolley in the present invention.

[0039] 101. Needle beam assembly; 102. Beam frame assembly; 103. Formwork assembly; 1031. Top formwork; 1032. Left side formwork; 1033. Lower left formwork; 1034. Right side formwork; 1035. Lower right formwork; 1036. Bottom formwork; 104. Variable diameter mechanism; 1041. Widening block; 105. Adjustment mechanism; 1051. Horizontal cylinder; 1052. Vertical cylinder; 106. Winch traction mechanism; 107. Anti-floating device; 108. Hydraulic system; 109. Electrical system. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the invention is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0044] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] A variable diameter full-circle needle beam trolley, such as Figures 1 to 6 As shown, it includes a needle beam assembly 101, a beam frame assembly 102, a template assembly 103, and a diameter-changing mechanism 104. The beam frame assembly 102 and the template assembly 103 are connected and arranged. The needle beam assembly 101 can be slidably arranged in the beam frame assembly 102 and the template assembly 103. The diameter-changing mechanism 104 is arranged in the template assembly 103, and the diameter-changing mechanism 104 can adjust the diameter of the template assembly 103.

[0047] Preferably, the needle beam assembly 101 includes a plurality of steel structure frames which are arranged equidistantly in the horizontal direction and in the shape of a U-shaped U, adjacent steel structure frames are fixedly connected with connecting steel sections, the outer sides of the connecting steel sections are fixedly connected with steel rails, and also includes a lifting mechanism arranged on the ground, and the bottoms of the first and last steel structure frames are arranged on the lifting end of the lifting structure.

[0048] Preferably, the beam-frame assembly 102 includes a frame beam.

[0049] Preferably, the template assembly 103 includes a top template 1031, a left template 1032, a right template 1034, a lower left template 1033, a lower right template 1035, and a bottom template 1036. The top template 1031, the left template 1032, the right template 1034, the lower left template 1033, the lower right template 1035, and the bottom template 1036 can form a closed loop structure connected end to end. The left template 1032 and the right template 1034 are respectively hinged to the two sides of the top template 1031, the side of the left template 1032 away from the top template 1031 is hinged to the lower left template 1033, and the side of the right template 1034 away from the top template 1031 is hinged to the lower left template 1033. One side is hinged to the lower right template 1035, the bottom template 1036 is fixedly connected to the bottom of the frame beam, and the two sides of the bottom template 1036 can be hinged to the lower left template 1033 and the lower right template 1035 respectively, and the hinges between the bottom template 1036, the lower left template 1033 and the lower right template 1035 can also be detachably set. Specifically, the hinges between the bottom template 1036, the lower left template 1033 and the lower right template 1035 are connected by a screw and a nut, and the distance between the top template 1031, the left side template 1032, the right side template 1034, the lower left template 1033, the lower right template 1035, and the bottom template 1036 and the frame beam can be adjusted.

[0050] Preferably, the diameter-changing mechanism 104 includes a widening block 1041 , which is detachably connected between the lower left template 1033 and the bottom template 1036 , and between the lower right template 1035 and the bottom template 1036 .

[0051] Preferably, it also includes an adjustment mechanism 105, which is arranged between the beam-frame assembly 102 and the template assembly 103. The adjustment mechanism 105 adjusts the orientation of the beam-frame assembly 102 and the template assembly 103 to complete the centering adjustment of the template assembly 103. The adjustment mechanism 105 includes a vertical cylinder and a horizontal cylinder 1051. The vertical cylinders are divided into two groups, one group of vertical cylinders is fixedly connected to the top of the frame beam, and the other group of vertical cylinders is fixedly connected to the bottom of the frame beam. The movable end of the upper vertical cylinder is connected to the top template 1031, and the movable end of the lower vertical cylinder is connected to the bottom template 1036. The adjustment mechanism 105 specifically realizes the adjustable setting of the distance between the top template 1031, the left template 1032, the right template 1034, the lower left template 1033, the lower right template 1035, and the bottom template 1036 and the frame beam.

[0052] Preferably, it also includes a hoisting and traction mechanism 106, which is arranged on the needle beam assembly 101, and a fixed pulley is arranged on the top of the steel structure frame and on the side away from the hoisting and traction mechanism 106. The wire rope in the hoisting and traction mechanism 106 is connected to the frame beam after passing through the fixed pulley. The hoisting and traction mechanism 106 is used to drive the needle beam assembly 101 and the frame beam to slide relative to each other. The hoisting and traction mechanism 106 includes a cycloidal pinwheel reducer and a double drum connected to it for transmission, and one end of the wire rope is arranged on the outside of the double drum.

[0053] Preferably, an anti-floating device 107 is also included, and the anti-floating device 107 includes a vertical anti-floating jack and a horizontal anti-floating jack. The vertical anti-floating jack and the horizontal anti-floating jack are respectively installed at the front and rear ends of the mold assembly and connected to the frame beam.

[0054] Preferably, it also includes an electrical system 109, which is electrically connected to the adjusting mechanism 105, the hoisting and traction mechanism 106, and the anti-floating device 107. The electrical system 109 controls the operation of the adjusting mechanism 105, the hoisting and traction mechanism 106, and the anti-floating device 107. The electrical system 109 controls the operation of the adjusting mechanism 105 and the anti-floating device 107 by serving the hydraulic system 108 of the pump station. The electrical system 109 adopts a 380V three-phase four-wire power supply, and mainly controls the switch of the oil pump motor of the hydraulic system 108 and the forward and reverse operation of the winch.

[0055] The present invention also provides a lining construction method of a variable diameter full-circle needle beam trolley, using the above variable diameter full-circle needle beam trolley, comprising the following steps:

[0056] Trolley design and layout: Design and arrange the variable diameter full-circle needle beam trolley according to the tunnel design parameters and construction requirements;

[0057] Rebar construction: Carry out the construction of side arch positioning reinforcement and reinforcement in the tunnel according to the design requirements to ensure that the reinforcement is firmly tied and the spacing is uniform. Specifically, it is divided into two parts: side arch positioning reinforcement construction and side arch reinforcement construction. The side arch positioning reinforcement is constructed by a positioning reinforcement trolley (6m reinforcement tying gantry). Subsequently, the reinforcement trolley (13m reinforcement tying gantry) is used to weld the inner longitudinal reinforcement and cut the frame reinforcement. When the reinforcement trolley moves, the trolley is lifted by a hydraulic jack and then H125 steel is inserted to fix it. The flatbed trolley is pulled into place by a locomotive, and then the trolley is supported and fixed by a jack.

[0058] Slag removal and preparation: clean up the slag and debris in the tunnel to prepare for concrete pouring, and check whether the parts of the trolley are installed in place to ensure construction safety. Specifically, use an electric pick to clean up some of the sprayed concrete backfill, and most of the slag is cleaned up by a 60 small excavator with manual work after the turnout is moved. The cleaned sludge is pulled out of the tunnel by a water tank placed on a flatbed truck;

[0059] Installation and removal of waterstop and plug: Install the embedded grouting pipe and plug template, install the rubber waterstop to ensure that there is no leakage during the concrete pouring process. Specifically, installation of waterstop: Use 651 and 653 type waterstop, and use vulcanized rubber to seal the round hole in the middle of the waterstop. After bonding, tie the waterstop firmly with wire within 1cm from the edge on both sides. Note that the wire should be tied firmly through the horizontal blade of the waterstop, but it must not penetrate the waterstop; prevent the bonding from cracking during the turning of the waterstop. It is forbidden to pass wire in the middle of the waterstop. Pull the waterstop from the bottom, go around the arch and return to the bottom for connection. The overlap length of the waterstop is not less than 20cm, and it is equipped with a vulcanizer for vulcanization connection. Use 8mm wire rod as the waterstop spring to fix the position of the waterstop to prevent the waterstop from shifting during concrete pouring. The installation position of the waterstop should be accurate and firmly installed, and there should be no deformation or distortion. The concrete around the waterstop needs to be vibrated and compacted, and the vibrating rod is prohibited from contacting the waterstop. The plug template is installed and reinforced: When installing the plug template, in order to improve construction efficiency, both sides are installed and reinforced simultaneously starting from the bottom. The plug template is a combination of steel formwork and wooden formwork. The plug template is divided into two layers. The lower layer is a steel formwork, which is connected to the web at the end of the formwork with screws. The lower plug template is designed with long holes and can move along the center of the circle. When the upper surface moves to the installation position of the waterstop (15cm on the water-facing side), the waterstop is then placed. The upper surface of the waterstop is pressed down with the upper plugging plate and fixed with a screw. The unblocked position of the upper plugging plate is blocked with a wooden plugging plate and fixed with a wedge. The gaps in the template can be blocked with closed-cell foam boards;

[0060] Demoulding, application of release agent and positioning: After the concrete strength reaches the design requirements, demolding operation is carried out and release agent is applied. The pouring position is determined by measuring the release points, and the trolley is positioned using the hydraulic system 108. When demolding, the concrete strength reaches the design requirements and can be demolded. First remove the screw rod and the bottom bolts, and then demold in the order of "bottom mold first, then side mold". After demolding, the template is manually polished with a grinder and a hammer, and a roller is used to apply the release agent. After the trolley is positioned, the embedded grouting pipe is installed, and the pipe opening is filled with nylon bags and other materials. The plug template is manually assembled and sealed with a 5cm thick wooden template and fixed with steel bars and steel pipes. The rubber waterstop is installed at the designed position using a single vulcanized hot bonding method;

[0061] Formwork support and concrete pouring: After the formwork is supported, concrete pouring is carried out. During the pouring process, the pouring speed and vibration intensity are controlled to ensure that the concrete is dense and free of bubbles. Specifically, after the concrete is mixed at the tunnel entrance mixing station, it is transported to the tunnel through a delivery pump and a locomotive. Concrete pouring is carried out through the feed port on the trolley, and vibrating rods and attached vibrators are used for vibration to ensure that the concrete is dense. At the same time, grouting holes and observation holes are reserved to monitor the concrete pouring situation;

[0062] Diameter change of the trolley: According to the change of the tunnel diameter, the diameter of the trolley template is adjusted by adding or removing the bottom template widening block 1041, replacing the left and right side template ear hole plates and adjusting the support height of the top template to achieve rapid diameter change. For example, when the trolley section is reduced from φ7.07m to φ6.51m, it is necessary to remove the 896mm and 894mm widening blocks 1041 on both sides of the bottom template 1036, replace the ear hole plates of the left template 1032 and the right template 1034, and adjust the corresponding cylinder heightening seat height. After the diameter change, the template deviation needs to be checked and ensured to be within the allowable range;

[0063] like Figure 7 As shown, skipping construction and backfill grouting: the double-trolley skipping construction method is adopted, and the double-set full-circle trolley is arranged in a "one jump and one clamp" manner. The interval section between the two trolleys is set as 1 section. The upstream section 4 is poured first (one jump), and then the 6th section is poured continuously after the 4th section to form the 5th section clamp (one clamp). The pouring construction is carried out in a cycle to improve the construction efficiency and reduce the waste of concrete. The concrete pouring sequence is 2-4-6 for trolley No. ①; 1-3-5-7 for trolley No. ②. After the lining concrete construction is completed, backfill grouting is carried out to ensure that the primary support and the lining are full and dense. When the strength of the lining concrete construction reaches 70%, backfill grouting is carried out. The backfill grouting hole diameter is not less than 38mm, and the hole is 10cm deep into the surrounding rock. Before grouting, the debris and concrete in the reserved grouting hole must be cleaned to ensure the grouting effect.

[0064] Further clarify the precautions for its operation and construction;

[0065] After each working cycle, check the tightness of bolts and pins in each part, and check and tighten various connecting parts;

[0066] The trolley winch and screw jack should be lubricated regularly;

[0067] The hydraulic system 108 should be free of seepage and oil leakage, the hydraulic oil should be clean, and the pressure fluctuation should be observed at any time during operation;

[0068] When the trolley is moving, there should be no obstacles such as air ducts, water pipes, wires, etc. between the needle beam assembly 101 and the template assembly 103;

[0069] If it is not absolutely necessary, try to avoid the trolley running empty for long distances;

[0070] After each move, the trolley must be adjusted to balance left and right, with the needle beam level and the center line in a straight line.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A variable diameter full-circle needle beam trolley, characterized in that: The invention comprises a needle beam assembly (101), a beam frame assembly (102), a template assembly (103), and a diameter-changing mechanism (104); the beam frame assembly (102) and the template assembly (103) are connected and arranged; the needle beam assembly (101) can be slidably arranged in the beam frame assembly (102) and the template assembly (103); the diameter-changing mechanism (104) is arranged in the template assembly (103), and the diameter-changing mechanism (104) can adjust the diameter of the template assembly (103).

2. The variable diameter full-circle needle beam trolley according to claim 1, characterized in that: The needle beam assembly (101) comprises a plurality of steel structure frames which are arranged equidistantly in the transverse direction and in the shape of a U-shaped U-shaped structure, wherein connecting steel sections are fixedly connected between adjacent steel structure frames, and steel rails are fixedly connected to the outer sides of the connecting steel sections, and further comprises a lifting mechanism arranged on the ground, wherein the bottoms of the first and last steel structure frames are arranged on the lifting end of the lifting structure.

3. The variable diameter full-circle needle beam trolley according to claim 2, characterized in that: The beam-frame assembly (102) comprises a frame beam.

4. The variable diameter full-circle needle beam trolley according to claim 3, characterized in that: The template assembly (103) comprises a top template (1031), a left template (1032), a right template (1034), a lower left template (1033), a lower right template (1035), and a bottom template (1036); the top template (1031), the left template (1032), the right template (1034), the lower left template (1033), the lower right template (1035), and the bottom template (1036) can form a closed loop structure connected end to end; the left template (1032) and the right template (1034) are respectively hinged to the two sides of the top template (1031); the side of the left template (1032) away from the top template (1031) is hinged to the lower left template (1035); 33), the right side template (1034) is hinged to the right lower template (1035) at a side away from the top template (1031), the bottom template (1036) is fixedly connected to the bottom of the frame beam, and the two sides of the bottom template (1036) can be hinged to the left lower template (1033) and the right lower template (1035) respectively, the hinges between the bottom template (1036), the left lower template (1033) and the right lower template (1035) can also be detachably arranged, and the spacing between the top template (1031), the left side template (1032), the right side template (1034), the left lower template (1033), the right lower template (1035), and the bottom template (1036) and the frame beam can be adjusted.

5. The variable diameter full-circle needle beam trolley according to claim 4, characterized in that: The diameter-changing mechanism (104) comprises a widening block (1041), and the widening block (1041) is detachably connected between the lower left template (1033) and the bottom template (1036), and between the lower right template (1035) and the bottom template (1036).

6. The variable diameter full-circle needle beam trolley according to claim 4, characterized in that: It also includes an adjustment mechanism (105), which is arranged between the beam frame assembly (102) and the template assembly (103), and the adjustment mechanism (105) adjusts the orientation of the beam frame assembly (102) and the template assembly (103) to complete the centering adjustment of the template assembly (103).

7. The variable diameter full-circle needle beam trolley according to claim 6, characterized in that: It also includes a hoisting and traction mechanism (106), which is arranged on the needle beam assembly (101), and a fixed pulley is arranged on the top of the steel structure frame and on a side away from the hoisting and traction mechanism (106). The steel wire rope in the hoisting and traction mechanism (106) is connected to the frame beam after passing through the fixed pulley. The hoisting and traction mechanism (106) is used to drive the needle beam assembly (101) and the frame beam to slide relative to each other.

8. The variable diameter full-circle needle beam trolley according to claim 7, characterized in that: It also includes an anti-floating device (107), which includes a vertical anti-floating jack and a horizontal anti-floating jack. The vertical anti-floating jack and the horizontal anti-floating jack are respectively installed at the front and rear ends of the mold assembly and are connected to the frame beam.

9. The variable diameter full-circle needle beam trolley according to claim 8, characterized in that: It also includes an electrical system (109), which is electrically connected to the adjustment mechanism (105), the hoisting and traction mechanism (106), and the anti-floating device (107), and the electrical system (109) controls the operation of the adjustment mechanism (105), the hoisting and traction mechanism (106), and the anti-floating device (107).

10. A lining construction method of a variable diameter full-circle needle beam trolley, using the variable diameter full-circle needle beam trolley as claimed in any one of claims 1 to 9, characterized in that: The following steps are included: Trolley design and layout: Design and arrange the variable diameter full-circle needle beam trolley according to the tunnel design parameters and construction requirements; Rebar construction: Carry out the construction of side and top arch positioning reinforcement and reinforcement in the tunnel according to the design requirements to ensure that the reinforcement is firmly tied and evenly spaced; Slag removal and preparation: clean up the slag and debris in the tunnel to prepare for concrete pouring, and check whether all parts of the trolley are installed in place; Demoulding, applying release agent and positioning: after the concrete strength reaches the design requirements, demoulding operation is carried out, and a release agent is applied. The pouring position is determined by measuring the placement point, and the trolley is positioned using the hydraulic system (108); Formwork support and concrete pouring: After the formwork is supported, concrete pouring is carried out. During the pouring process, the pouring speed and vibration intensity are controlled to ensure that the concrete is dense and free of bubbles; Diameter change of the trolley: according to the change of the tunnel diameter, the bottom template widening block (1041) is increased or decreased, the left and right side template ear hole plates are replaced, and the support height of the top template is adjusted to adjust the diameter of the trolley template to achieve rapid diameter change; Skip-bin construction and backfill grouting: The double-trolley skip-bin construction method is adopted. The two sets of full-circle trolleys are arranged in a "one jump and one clamp" manner. The concrete pouring sequence is 2-4-6 for trolley No. ①; 1-3-5-7 for trolley No. ②. After the lining concrete construction is completed, backfill grouting is carried out to ensure that the primary support and the lining are full and dense.

Images