Two-span non-counterweight channel building machine and water conservancy aqueduct cross-by-cross cast-in-place construction method

Abstract

The application discloses a two-span weightless channel forming machine and a water conservancy aqueduct cross-by-cross cast-in-place construction method, wherein the two-span weightless channel forming machine comprises a main frame, supporting legs, a hanging outer rib system, an outer mold system, an inner mold system and a hoisting system; the main frame is two-span long and comprises a guide beam at the front end and a bearing main beam at the rear end; the supporting legs comprise a No.1 supporting leg, a No.2 supporting leg, a No.3 supporting leg, a No.4 supporting leg and a No.5 supporting leg arranged in sequence from front to back; the No.1 supporting leg is a movable supporting leg; the No.2 supporting leg and the No.3 supporting leg are fixed supporting legs; the No.4 supporting leg is a movable supporting leg and is provided with a horizontal moving mechanism and a longitudinal moving mechanism; and the No.5 supporting leg is a fixed supporting leg and is provided with a longitudinal moving through-hole mechanism. The two-span structure is adopted, the through-hole is in place in one step, no additional counterweight is needed at the rear end, the good anti-forward tilting safety of the whole machine is ensured, the cast-in-place channel forming construction period is effectively shortened, and the application prospect is good.

Description

Technical Field

[0001] This invention relates to the field of cast-in-place construction technology for span-by-span hydraulic aqueducts, and in particular to a two-span counterweight-free aqueduct-making machine and a method for cast-in-place construction of span-by-span hydraulic aqueducts. Background Technology

[0002] As a crucial component of water diversion projects, especially in mountainous areas where the route accounts for over 50% of the total length, the rapid and safe construction of aqueducts is key to ensuring the project's timely completion.

[0003] The traditional full-span scaffolding method is still widely used in the construction of cast-in-place aqueducts, which is greatly affected by the terrain, slow, and unsafe. The few instances where trenching machines are used also have various construction drawbacks.

[0004] For example, the invention patent (publication number CN205999855U) applied for by the applicant on August 30, 2016, discloses a mobile formwork for a single rectangular top-opening closed hydraulic aqueduct, including an outer beam system, an inner beam system, and a hoisting system. The entire machine is one and a half spans long. The equipment drives the outer beam to move through a hydraulic system, requiring two passage through holes. In order to ensure the overturning safety of the equipment, a large number of counterweights need to be added to the rear end of the equipment, which unnecessarily increases the construction load. The equipment also has drawbacks such as complex operation, no adjustable formwork, the position of the outriggers affecting the prestressing tension, and inconvenience in inputting construction materials.

[0005] For example, the invention patent applied for by this applicant on August 30, 2016 (publication number CN115233570A) discloses a variable-span trenching machine for bidirectional symmetrical construction. It adopts a structure with a single-span main beam and guide beams for each half-span, primarily for reverse-direction construction. It requires the addition of counterweights and a pier-top anchoring system. This technical solution addresses specific working conditions: bidirectional symmetrical construction, and does not meet the general requirements of hydraulic aqueduct construction. Summary of the Invention

[0006] In order to solve the problems in the prior art, the present invention provides a two-span counterweightless trenching machine with simple operation, convenient and safe passage through holes, and reasonable support position, as well as a method for cast-in-place construction of hydraulic aqueducts span by span.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A two-span counterweight-free trenching machine includes a main frame, legs, a hanging external rib system, an external mold system, an internal mold system, and a lifting system.

[0009] The main frame is two spans long, including a guide beam with a front span and a load-bearing main beam with a rear span.

[0010] The outriggers include outrigger 1, outrigger 2, outrigger 3, outrigger 4, and outrigger 5 arranged sequentially from front to back, wherein:

[0011] The first support leg is a movable support leg, which serves as the front support point when the equipment passes through the hole. The first support leg is slidably connected to the guide beam.

[0012] Leg 2 and Leg 3 are fixed legs, serving as support legs during heavy-load pouring; Leg 2 and Leg 3 are fixedly connected to the connection points set on the main beam.

[0013] The fourth outrigger is a movable outrigger, serving as the central support point when the equipment passes through holes; the fourth outrigger has a transverse movement mechanism and a longitudinal movement mechanism, providing power for the longitudinal and transverse movement of the entire machine;

[0014] The No. 5 support leg is a fixed support leg, serving as the rear support point when the equipment passes through the hole. The No. 5 support leg also has a longitudinal movement through-hole mechanism. The No. 5 support leg is fixedly connected to the connection point set on the main beam.

[0015] Furthermore, the upper part of the No. 1 support leg is equipped with a passive roller box, which is supported on the lower track of the guide beam; the lower part of the No. 1 support leg has two sets of A-frame triangular frame structures, and the lower end of each set of A-frame triangular frame structures forms two support points, which are used to support the trough pier pad stone in the construction state, and are clamped to the trough pier pad stone by a longitudinal pier clamping mechanism.

[0016] Furthermore, the second and third support legs have the same structural form, both being portal-type structures, including a first corbel, a first column, and a supporting cylinder that are fixedly connected vertically. The first corbel is bolted to the main beam, and the supporting cylinder is supported on the piers on both sides of the trough during construction.

[0017] Furthermore, the fourth support leg includes an upper shifting trolley and a lower crossbeam. The shifting trolley contacts the track under the main beam via a sliding seat. The shifting trolley sits on the crossbeam and can move laterally along the crossbeam under the pushing and pulling action of the lateral shifting cylinder, forming a lateral shifting mechanism. A longitudinal shifting cylinder is installed on the shifting trolley to realize the longitudinal shifting of the whole machine through the hole and the forward movement of the support leg itself, forming a longitudinal shifting mechanism.

[0018] Furthermore, the fifth outrigger is divided into two parts: a front end and a rear end.

[0019] The front end is a lifting cylinder support leg, which includes a second bracket, a second column and a lifting cylinder that are fixedly connected in sequence from top to bottom;

[0020] The rear end is a longitudinal jacking support leg, which includes a third bracket, a third column and a longitudinal jacking assembly that are fixedly connected in sequence. The longitudinal jacking assembly includes a slide block fixed to the lower end of the third column. The slide block is provided with a sliding beam that slides and engages with it in the front-back direction. The rear end of the sliding beam is provided with a longitudinal jacking cylinder. The cylinder of the longitudinal jacking cylinder is connected to the sliding beam, and the piston rod of the longitudinal jacking cylinder is connected to the slide block.

[0021] The front and rear sections are connected to the main beam via flanges; the front and rear sections cooperate to form a longitudinal movement through-hole mechanism, which pushes the main beam through the hole in a walking manner; the steps of the fifth support leg pushing the main beam through the hole in a walking manner are as follows:

[0022] a. The hydraulic cylinder lifts the slide beam, which is then suspended on the slide block;

[0023] b. The longitudinal thrust cylinder retracts, causing the sliding beam to move forward along the slide block until it reaches the support position;

[0024] c. Retract the support cylinder to support the sliding beam on the top of the groove;

[0025] d. The longitudinal thrust cylinder extends, and the rear end of the supporting main beam moves forward one step along the sliding beam;

[0026] e. Repeat steps a to d, moving the rear end of the load-bearing main beam forward in a step-like manner.

[0027] Furthermore, the suspended outer rib system includes two symmetrically arranged suspended outer ribs, each of which is a C-shaped truss structure; the upper part of the suspended outer rib is hinged to the side of the main frame structure, and a rotating hydraulic cylinder is installed between the main frame and the suspended outer rib; the bottom of the two suspended outer ribs are connected by flanges.

[0028] Furthermore, the outer mold system includes a side mold and a bottom mold, which are connected to the hanging outer ribs through multiple sets of adjustable support rods, and the side mold and bottom mold are hinged together.

[0029] Furthermore, the inner mold system is an integral hydraulic inner mold system.

[0030] Furthermore, the lifting system consists of a lifting device and a traveling rail; the traveling rail is arranged along the side of the main frame structure, and the lifting device is slidably installed on the traveling rail.

[0031] This invention also discloses a method for cast-in-place construction of a hydraulic aqueduct span by span, based on the aforementioned two-span counterweight-free aqueduct construction method, comprising the following steps:

[0032] 1) The second and third outriggers of the trenching machine lift the equipment to the trenching elevation, tie the reinforcing bars, erect the inner formwork, and pour the concrete trench.

[0033] 2) After the concrete is poured and reaches the tension strength, the No. 2 and No. 3 support legs are retracted to allow the entire trenching machine to fall and be demolded; the bottom formwork and the bottom center seam connection of the hanging external rib system are removed, and the hanging external rib system carries the external formwork system to rotate and open, avoiding the trench pier;

[0034] 3) The No. 5 support leg is lifted, the No. 4 support leg is dislodged, and moved forward to the front end of the already poured trough for support;

[0035] 4) The No. 2 and No. 3 outriggers retract, detaching from the top of the pier; drive the longitudinal movement mechanism of the No. 4 outrigger and the longitudinal movement through-hole mechanism of the No. 5 outrigger, the whole machine moves longitudinally one span to reach the new trenching position; the No. 2 and No. 3 outriggers are lifted, and the trenching machine reaches the trenching elevation.

[0036] 5) The No. 1 outrigger was moved by the hoisting system to the top of the pier for installation;

[0037] 6) The hanging outer rib system and outer mold system are assembled and positioned, and the center seam is connected;

[0038] 7) After the bottom slab and web reinforcement are tied, drive in the inner formwork system; pour the top slab concrete;

[0039] 8) Repeat steps 1) to 7) to complete the construction of the hydraulic aqueduct.

[0040] The beneficial effects of this invention are:

[0041] 1. The two-span structure allows for one-step passage through the hole, eliminating the need for additional counterweights at the rear and ensuring good anti-tilting safety for the entire machine.

[0042] 2. During normal construction and hole-passing operations of the trenching machine, no additional embedded parts are required for the trench or pier.

[0043] 3. The side molds of the outer mold system can rotate outward around the bottom to adapt to the mold opening of special grooves with stiffening rib structures.

[0044] The four-sided outer ribs carry the outer mold in a single-piece hydraulic cylinder for rotary opening, which is fast, more operable, and has a more reasonable structure.

[0045] 5. The front and rear support legs of the trenching machine are both located on the top of the piers on both sides of the trench, so there is no spatial interference for end tensioning; construction materials such as steel bars can be smoothly entered from the front ground and the rear trench surface using the lifting system, which facilitates construction.

[0046] 6. The outer mold system and the hanging outer ribs are connected by adjustable supports, which can easily adjust the template line shape.

[0047] 7. The internal mold system adopts an integrated hydraulic system, which can be demolded, inserted into the mold, and supported as a whole. The process is simple and highly automated.

[0048] 8. The lifting, horizontal opening and closing, and longitudinal movement of the trenching machine through the hole are all hydraulically controlled, ensuring smooth and reliable operation, while reducing labor intensity and improving construction efficiency.

[0049] 9. Through the application of this invention, the in-situ span-by-span cast-in-place construction of hydraulic aqueducts can achieve the goal of no counterweight, no anchoring, and one-time hole placement, and facilitates the entry of construction materials from the ground into the construction template cavity, effectively shortening the construction cycle of cast-in-place aqueducts and showing good application prospects. Attached Figure Description

[0050] Figure 1 The diagram shown is a schematic representation of the overall structure of the present invention.

[0051] Figure 2 The figure shown is a cross-sectional view of the mold-closed state of the present invention;

[0052] Figure 3 The figure shown is a cross-sectional view of the mold opening state of the present invention;

[0053] Figure 4 The image shown is a front view of the main frame of this invention;

[0054] Figure 5 The image shown is a top view of the main frame of the present invention;

[0055] Figure 6 The figure shown is a schematic cross-sectional view of the main beam of the main frame of the present invention.

[0056] Figure 7 The figure shown is a cross-sectional schematic diagram of the main frame guide beam of the present invention.

[0057] Figure 8 The diagram shown is a schematic diagram of the No. 1 support leg structure of the present invention;

[0058] Figure 9 The diagram shown is a schematic diagram of the second and third support legs of the present invention;

[0059] Figure 10 The diagram shown is a schematic diagram of the fourth support leg structure of the present invention;

[0060] Figure 11 The diagram shown is a schematic diagram of the No. 5 support leg structure of the present invention;

[0061] Figure 12 The diagram shown is a schematic of the standard construction process 1 of this invention;

[0062] Figure 13 The diagram shown is a schematic of the standard construction process 2 of this invention;

[0063] Figure 14 The diagram shown is a schematic of the standard construction process 3 of this invention;

[0064] Figure 15 The diagram shown is a schematic diagram of the standard construction process 4 of this invention;

[0065] Figure 16 The diagram shown is a schematic of the standard construction process 5 of this invention;

[0066] Figure 17 The diagram shown is a schematic of the standard construction process 6 of this invention;

[0067] Figure 18 The diagram shown is a schematic of the standard construction process 7 of this invention.

[0068] The main reference numerals in the figure are:

[0069] 1. Load-bearing main frame; 1-1 Load-bearing main beam; 1-2. Guide beam; 1-3. Cantilever beam; 1-4. Triangular frame;

[0070] 2. Outrigger No. 1; 2-1. Roller box; 2-2. Human-shaped tripod; 2-3. Stopping mechanism;

[0071] 3. Outriggers No. 2 and No. 3; 3-1. First support leg; 3-2. First column; 3-3. Support cylinder;

[0072] 4. Outrigger No. 4; 4-1. Transfer trolley; 4-2. Crossbeam; 4-3. Horizontal transfer cylinder; 4-4. Longitudinal transfer cylinder;

[0073] 5. No. 5 support leg; 5-1. Support cylinder; 5-2. Second column; 5-3. Second bracket; 5-4. Sliding beam; 5-5. Slide seat; 5-6. Third bracket; 5-7. Third column; 5-8. Longitudinal thrust cylinder;

[0074] 6. Suspend the outer rib; 6-1. Rotate the hydraulic cylinder;

[0075] 7. Outer mold system; 7-1. Side mold; 7-2. Bottom mold; 7-3. Adjustable support rod;

[0076] 8. Internal mold system;

[0077] 9. Lifting system; 9-1. Lifting device; 9-2. Traveling track.

[0078] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0079] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0080] like Figure 1 As shown, this embodiment provides a two-span, counterweight-free aqueduct casting machine, including a main frame 1, second and third support legs 3 for heavy-load casting, first and fourth support legs 4 and fifth support legs 5 for moving the formwork through the holes, an outer rib suspension system, an outer formwork system 7, an inner formwork system 8, a lifting system 9, and an electrical and hydraulic control system. The outer formwork system 7 and the inner formwork system 8 form the inner and outer casting contours of the hydraulic aqueduct.

[0081] The preferred structure of main frame 1 is as follows: Figure 4-7 As shown, the main frame 1 is a two-span structure consisting of a front guide beam 1-2 (length L2), a rear load-bearing main beam 1-1 (length L1), a load-bearing main beam 1-1, cantilever beams 1-3 symmetrically arranged on both sides, and a triangular frame 1-4 on the side of the guide beam 1-2. The load-bearing main beam 1-1 has connecting flanges for the second and third legs 3 and the fifth leg 5 arranged on its side.

[0082] The superior structure of outrigger 2 is as follows: Figure 8 As shown, this is a movable support leg, serving as the front support point when the equipment passes through the hole. A passive roller box 2-1 is installed on the upper part of the support leg, supporting it on the lower track of the guide beam 1-2. The lower part of the first support leg consists of two sets of A-frame triangular frames 2-2, increasing the lower support point to 2+2, supporting it on the trough pier pad stone, and clamping it to the pad stone via a longitudinal clamping mechanism 2-3 (the longitudinal clamping mechanism is existing technology and will not be described in detail in this embodiment). This structure requires no anchoring and can resist overturning caused by friction at the top.

[0083] The superior structure of outriggers 2 and 3 is as follows: Figure 9 As shown, the second and third outriggers are fixed outriggers with the same structural form, both being portal-type structures. They consist of a first corbel 3-1, a first column 3-2, and a supporting hydraulic cylinder 3-3, which are fixedly connected from top to bottom. The second and third outriggers are respectively located at the front and rear ends of the main supporting beam 1-1, with their upper parts bolted to the main supporting beam 1-1 and their lower parts supported on the piers on both sides of the trough by the supporting hydraulic cylinder 3-3.

[0084] The superior structure of the No. 4 outrigger is as follows: Figure 10 As shown, the movable support leg serves as the central support point when the equipment passes through the hole and provides power for the longitudinal and transverse movement of the entire machine. It mainly includes the following components: a shifting trolley 4-1, a crossbeam 4-2, etc. The upper shifting trolley 4-1 contacts the track under the main supporting beam 1-1 via a sliding seat. The shifting trolley 4-1 sits on the crossbeam 4-2 and can move laterally along the crossbeam under the pushing and pulling action of the transverse shifting cylinder 4-3, forming a transverse shifting mechanism. A longitudinal shifting cylinder 4-4 is installed on the shifting trolley, enabling the entire machine to move longitudinally through the hole and for the support leg to move forward, forming a longitudinal shifting mechanism.

[0085] The superior structure of the No. 5 outrigger is as follows: Figure 11 As shown, this is a fixed support leg, serving as the rear support point when the equipment passes through the hole. Support leg number five consists of two parts: a front end and a rear end.

[0086] The front end is a lifting cylinder support leg, which includes a second bracket 5-3, a second column 5-2, and a lifting cylinder 5-1 that are fixedly connected from top to bottom.

[0087] The rear end is a longitudinal sliding and pushing support leg, including a third bracket 5-7, a third column 5-6 and a longitudinal sliding assembly that are fixedly connected in sequence from top to bottom. The longitudinal sliding assembly includes a slide block 5-5 fixed to the lower end of the third column 5-6. The slide block 5-5 is provided with a sliding beam 5-4 that slides and engages with it in the front-back direction. The rear end of the sliding beam 5-4 is provided with a longitudinal pushing cylinder 5-8. The cylinder of the longitudinal pushing cylinder 5-8 is connected to the sliding beam 5-4, and the piston rod of the longitudinal pushing cylinder 5-8 is connected to the slide block 5-5.

[0088] The front and rear sections are connected to the main beam via flanges, and the front and rear sections work together to form a longitudinal movement through-hole mechanism, which pushes the main beam to move longitudinally through the hole.

[0089] The steps for the No. 5 outrigger to push the load-bearing main beam through the bore in a step-by-step longitudinal movement are as follows:

[0090] a. The hydraulic cylinder 5-1 lifts the slide beam 5-4, which is then suspended on the slide block 5-5.

[0091] b. The longitudinal thrust cylinder 5-8 retracts, causing the sliding beam 5-4 to move forward along the slide block 5-5 to the support position.

[0092] c. Retract the support cylinder 5-1 so that the sliding beam 5-4 is supported on the top of the groove.

[0093] d. The longitudinal thrust cylinder 5-8 extends, and the rear end of the main beam 1-1 moves forward one step along the sliding beam 5-4;

[0094] e. Repeat steps a to d, moving the rear end of the load-bearing main beam forward in a step-like manner.

[0095] like Figure 1-3 As shown, the suspended outer rib system includes two symmetrically arranged suspended outer ribs 6. Each suspended outer rib 6 is a C-shaped truss structure, hinged to the cantilever beam 1-3 at the top. A rotary hydraulic cylinder 6-1 is installed between the cantilever beam 1-3 and the outer rib 6 to realize the opening and closing of the outer mold system 7. The bottoms of the left and right suspended outer ribs 6 are connected by flanges with a 15-degree bevel to ensure that the left and right outer ribs do not interfere with each other when opening and closing.

[0096] like Figure 1-3As shown, the outer mold system includes a side mold 7-1 and a bottom mold 7-2, which are connected to the hanging outer rib 6 through multiple sets of adjustable support rods 7-3. The side mold 7-1 and the bottom mold 7-2 are hinged together and can rotate outward around the pin axis.

[0097] like Figure 1-3 As shown, the folding and opening actions of the inner mold system are completed by hydraulic cylinders, and the forward movement through the hole is completed by the traveling wheels and the lifting system 9 of the trenching machine.

[0098] like Figure 1-3 As shown, the lifting system consists of a lifting device 9-1 and a traveling rail 9-2. The traveling range of the lifting device is within the construction span and the range of the front guide beam. The traveling rail 9-2 includes a rear rail and a front rail. The rear rail is connected to the lower part of the cantilever beam 1-3 and the front main leg bracket 3-1; the front rail is supported and connected to the triangular brackets 1-4 on both sides of the guide beam.

[0099] like Figure 12-18 As shown, this embodiment also discloses a method for cast-in-place construction of a hydraulic aqueduct span by span, based on the above-mentioned two-span counterweight-free trenching machine, including the following steps:

[0100] 1) The second and third outriggers 3 of the trenching machine are supported by hydraulic cylinders 3-3 to lift the equipment to the trenching elevation, tie the reinforcing bars, erect the inner formwork, and pour the concrete trench.

[0101] 2) After the concrete is poured and reaches the tension strength, the support cylinders 3-3 of the second and third outriggers 3 are retracted to make the entire trenching machine drop about 15cm to demold; remove the bottom formwork 7-2 and the bottom center seam connecting bolts of the hanging outer rib 6, operate the rotating cylinder 6-1, and the hanging outer rib 6 carries the outer formwork system 7 to rotate and open, avoiding the trench pier.

[0102] 3) The hydraulic cylinder 5-1 of the fifth outrigger 5 is lifted, the fourth outrigger 4 is disengaged, and moves forward to the front end of the poured tank and supports it;

[0103] 4. The bottom support cylinders 3-3 of the No. 2 and No. 3 outriggers retract, detaching from the top of the support, driving the longitudinal movement cylinder 4-4 of the No. 4 outrigger and the longitudinal push cylinder 5-8 of the No. 5 outrigger, the whole machine moves longitudinally one span to reach the new trenching position; the bottom support cylinders 3-3 of the No. 2 and No. 3 outriggers lift, the trenching machine reaches the trenching elevation, and the cylinders lock.

[0104] 5) Outrigger 2 is moved by lifting system 9 to the top of the pier for installation;

[0105] 6) Operate the rotating cylinder 6-1 to bring the outer rib 6 and outer mold system 7 into place and connect the center bolts;

[0106] 7) After the bottom slab and web reinforcement are tied, drive into the inner formwork system 8; pour the top slab concrete;

[0107] 8) Repeat steps 1) to 7) to complete the construction of the hydraulic aqueduct.

[0108] In this embodiment, the two-span unbalanced trenching machine and the method of cast-in-place construction of hydraulic aqueduct span by span do not require any pre-embedded devices for anchoring during construction and hole crossing; the whole machine does not need to add counterweights to increase the overturning resistance coefficient of the equipment; the whole machine moves longitudinally through the hole in one go.

[0109] The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

[0110] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0111] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0112] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A two-span counterweight-free trenching machine, comprising a main frame, legs, a hanging external rib system, an external mold system, an internal mold system, and a lifting system, characterized in that: The main frame is two spans long, including a guide beam with a front span and a load-bearing main beam with a rear span. The outriggers include outrigger 1, outrigger 2, outrigger 3, outrigger 4, and outrigger 5 arranged sequentially from front to back, wherein: The first support leg is a movable support leg, which serves as the front support point when the equipment passes through the hole. The first support leg is slidably connected to the guide beam. Leg 2 and Leg 3 are fixed legs, serving as support legs during heavy-load pouring; Leg 2 and Leg 3 are fixedly connected to the connection points set on the main beam. The fourth outrigger is a movable outrigger, serving as the central support point when the equipment passes through holes; the fourth outrigger has a transverse movement mechanism and a longitudinal movement mechanism, providing power for the longitudinal and transverse movement of the entire machine; The No. 5 support leg is a fixed support leg and serves as the rear support point when the equipment passes through the hole. The No. 5 support leg also has a longitudinal movement through-hole mechanism. The No. 5 support leg is fixedly connected to the connection point set on the main beam. The No. 5 support leg is divided into two parts: the front end and the rear end. The front end is a lifting cylinder support leg, which includes a second bracket, a second column and a lifting cylinder that are fixedly connected in sequence from top to bottom; The rear end is a longitudinal jacking support leg, which includes a third bracket, a third column and a longitudinal jacking assembly that are fixedly connected in sequence. The longitudinal jacking assembly includes a slide block fixed to the lower end of the third column. The slide block is equipped with a sliding beam that slides and engages with it in the front-back direction. The rear end of the sliding beam is equipped with a longitudinal jacking cylinder. The cylinder of the longitudinal jacking cylinder is connected to the sliding beam, and the piston rod of the longitudinal jacking cylinder is connected to the slide block. The front and rear sections are connected to the main beam via flanges; the front and rear sections cooperate to form a longitudinal movement through-hole mechanism, pushing the main beam through the hole in a walking longitudinal movement manner; the steps of the fifth support leg pushing the main beam through the hole in a walking longitudinal movement manner are as follows: a. The hydraulic cylinder lifts the slide beam, which is then suspended on the slide block; b. The longitudinal thrust cylinder retracts, causing the sliding beam to move forward along the slide block until it reaches the support position; c. Retract the support cylinder to support the sliding beam on the top of the groove; d. The longitudinal thrust cylinder extends, and the rear end of the supporting main beam moves forward one step along the sliding beam; e. Repeat steps a to d, moving the rear end of the load-bearing main beam forward in a step-like manner; The suspended outer rib system includes two symmetrically arranged suspended outer ribs, each of which is a C-shaped truss structure; the upper part of the suspended outer rib is hinged to the side of the main frame structure, and a rotating hydraulic cylinder is installed between the main frame and the suspended outer rib; the bottom of the two suspended outer ribs are connected by flanges.

2. The two-span counterweight-free trenching machine according to claim 1, characterized in that: The upper part of the No. 1 support leg is equipped with a passive roller box, which is supported on the lower track of the guide beam; the lower part of the No. 1 support leg has two sets of A-frame triangular frame structures, and the lower end of each set of A-frame triangular frame structures forms two support points, which are used to support the trough pier pad stone in the construction state, and are clamped to the trough pier pad stone by a longitudinal pier clamping mechanism.

3. The two-span counterbalanced tank producer as claimed in claim 1, characterized in that: The No. 2 and No. 3 outriggers have the same structural form, both being portal-type structures, including a first corbel, a first column, and a supporting hydraulic cylinder that are fixedly connected vertically. The first corbel is bolted to the main beam, and the supporting hydraulic cylinder is supported on the piers on both sides of the trough during construction.

4. The two-span counterbalanced tank producer as claimed in claim 1, wherein: The fourth support leg includes an upper shifting trolley and a lower crossbeam. The shifting trolley contacts the track under the main beam via a sliding seat. The shifting trolley sits on the crossbeam and can move laterally along the crossbeam under the pushing and pulling action of the lateral shifting cylinder, forming a lateral shifting mechanism. A longitudinal shifting cylinder is installed on the shifting trolley to realize the longitudinal shifting of the whole machine through the hole and the forward movement of the support leg itself, forming a longitudinal shifting mechanism.

5. The two-span counterbalanced tank producer as claimed in claim 1, wherein: The outer mold system includes a side mold and a bottom mold. The side mold and the bottom mold are connected to the hanging outer rib through multiple sets of adjustable support rods, and the side mold and the bottom mold are hinged together.

6. The two-span counterbalanced tank producer of claim 1, wherein: The internal mold system is an integral hydraulic internal mold system.

7. The two-span weightless tank making machine according to claim 1, characterized in that: The lifting system consists of a lifting device and a traveling rail; the traveling rail is arranged along the side of the main frame structure, and the lifting device is slidably installed on the traveling rail.

8. A water conservancy aqueduct cross-by-cross cast-in-place construction method, based on the two-span non-counterweight aqueduct forming machine construction method of any one of claims 1-7, characterized in that Includes the following steps: 1) The second and third outriggers of the trenching machine lift the equipment to the trenching elevation, tie the reinforcing bars, erect the inner formwork, and pour the concrete trench. 2) After the concrete is poured and reaches the tension strength, the No. 2 and No. 3 support legs are retracted to allow the entire trenching machine to fall and be demolded; the bottom formwork and the bottom center seam connection of the hanging external rib system are removed, and the hanging external rib system carries the external formwork system to rotate and open, avoiding the trench pier; 3) The No. 5 support leg is lifted, the No. 4 support leg is dislodged, and moved forward to the front end of the already poured trough for support; 4) The No. 2 and No. 3 outriggers retract, detaching from the top of the pier; drive the longitudinal movement mechanism of the No. 4 outrigger and the longitudinal movement through-hole mechanism of the No. 5 outrigger, the whole machine moves longitudinally one span to reach the new trenching position; the No. 2 and No. 3 outriggers are lifted, and the trenching machine reaches the trenching elevation. 5) The No. 1 outrigger was moved by the hoisting system to the top of the pier for installation; 6) The hanging outer rib system and outer mold system are assembled and positioned, and the center seam is connected; 7) After the bottom slab and web reinforcement are tied, drive in the inner formwork system; pour the top slab concrete; 8) Repeat steps 1) to 7) to complete the construction of the hydraulic aqueduct.

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