A cast-in-place support method for aqueduct

Abstract

The invention discloses a cast-in-place aqueduct support method, comprising the following steps: casting a cap beam on the top of a pier column, and pre-buried a longitudinal pipe in the cap beam; hanging a hanger on the front and rear sides of the cap beam; inserting a tie rod into the longitudinal pipe; fixing the hanger at the end of the tie rod; installing a lifting and adjusting mechanism at the lower end of the hanger, and arranging a longitudinal frame between the cap beams of two adjacent pier columns; installing a template system on the top of the longitudinal frame, and adjusting the template system to the vertical template height through the lifting and adjusting mechanism; casting an aqueduct on the template system; respectively arranging a discharge system between the two ends of the aqueduct and the two ends of the longitudinal frame; after tightening the longitudinal frame through the discharge system, removing the connection between the longitudinal frame and the lifting and adjusting mechanism, and then lowering the longitudinal frame through the discharge system to separate the template system from the aqueduct; then, continuing to lower the longitudinal frame to the ground through the discharge system, and then dismantling the longitudinal frame and the template system. The cast-in-place aqueduct support method reduces construction costs, reduces construction land occupation, and improves construction efficiency and construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, and in particular to a cast-in-place support method for an aqueduct. Background Art

[0002] The construction of the aqueduct body is a key sub-project. At present, the main construction methods used for aqueducts are ground-type support construction method, prefabricated frame construction method, and slot making machine construction method. The ground-type support construction is limited by the height of the aqueduct piers, the construction period is long for high piers, the foundation treatment cost is high, and the economy is poor. The prefabricated frame construction method requires a prefabrication site, large-scale machinery and equipment to cooperate with the construction, and the piers need to be specially designed. The slot making machine construction method generally requires special design of the piers, the equipment cost is high at one time, and it is difficult to pass through the hole when the turning radius is small. Among the many methods, how to ensure low investment, convenient construction, high efficiency, small footprint, and good quality is difficult. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a cast-in-place aqueduct support method which reduces construction costs, reduces construction space, and improves construction efficiency and construction quality.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A cast-in-place aqueduct support method comprises the following steps:

[0006] S1. Casting of cap beam: Cast the cap beam on the top of the pier column, and embed longitudinal pipes in the cap beam so that the longitudinal pipes run through both sides of the cap beam;

[0007] S2. Installation of hanging parts: Hanging parts are hung on the front and rear sides of the cap beam; insert the tie rod into the longitudinal pipe so that the two ends of the tie rod extend from the two ends of the longitudinal pipe respectively; fix the hanging parts on the ends of the tie rod;

[0008] S3, installation of the longitudinal frame: install a lifting and adjusting mechanism at the lower end of the hanging member, and set the longitudinal frame between the cap beams of two adjacent piers, so that both ends of the longitudinal frame are respectively set on the lifting and adjusting mechanism on the corresponding cap beam;

[0009] S4. Formwork system installation: Install the formwork system on the top of the vertical frame and adjust the formwork system to the vertical formwork height through the lifting and adjusting mechanism;

[0010] S5, aqueduct casting: Cast the aqueduct on the formwork system so that both ends of the aqueduct are supported on the cap beams of two adjacent piers;

[0011] S6. Installation of unloading system: Unloading systems are respectively installed between the two ends of the aqueduct and the two ends of the longitudinal frame;

[0012] S7, demolding and removal: After tightening the longitudinal frame through the unloading system, remove the connection between the longitudinal frame and the lifting and adjusting mechanism, and then lower the longitudinal frame by an appropriate distance through the unloading system to separate the formwork system on the longitudinal frame from the aqueduct to achieve demolding; then, continue to lower the longitudinal frame to the ground through the unloading system, and then remove the longitudinal frame and the formwork system.

[0013] As a further improvement of the above technical solution:

[0014] In S3, the lifting and adjusting mechanism includes a screw rod, an adjusting nut and a transverse hanging beam. The top end of the screw rod is first fixed on the hanging piece, and then the transverse hanging beam is put on the screw rod and clamped and fixed by the adjusting nut, and then the two ends of the longitudinal frame are respectively placed on the corresponding transverse hanging beams.

[0015] In S2, a horizontal hanging portion is provided at the top end of the hanging member, and the horizontal hanging portion is hung on the top surface of the cap beam.

[0016] In S2, the hanging member is fixed on the pull rod by a fixing nut.

[0017] The hanging parts on both sides of the cap beam are installed on the pull rod at the same time.

[0018] In S6, the unloading system includes a crossbeam and two hoists. The crossbeam is firstly arranged on the top surface of the aqueduct so that the two ends of the crossbeam extend from the two sides of the aqueduct respectively. Then, the hoists are installed at the two ends of the crossbeam and the hoists are respectively arranged on the two sides of the longitudinal frame.

[0019] In the above S4, after lateral distribution beams are arranged at intervals along the length direction on the top surface of the longitudinal frame, the formwork system is installed on the top of each lateral distribution beam.

[0020] The longitudinal frame adopts Bailey beam support.

[0021] The transverse distribution beam is fixed on the longitudinal frame by U-shaped bolts.

[0022] After the formwork system is installed, the preloading method is used to test the strength.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] In the cast-in-place support method for aqueduct, when the formwork is erected, the longitudinal frame is suspended by the hanging parts to support the formwork system, does not fall to the ground, is not limited by the height of the pier, and does not need to increase the height structure when the pier is high. The construction cost is low and the period is short. In addition, the formwork system is adjusted to the formwork height by the lifting and adjusting mechanism, which improves the efficiency of formwork erection and the accuracy of formwork erection position, thereby improving the construction quality. The mechanical principle is fully utilized, and the vertical force of the hanging parts is temporarily tied by the pull rod. The hanging parts are used to convert the structural force from the vertical force of the hanging parts to the horizontal force of the pull rod, which reduces manual operation, improves the safety of construction, improves the efficiency of installation and removal, and can be reused. Especially for the construction of aqueducts with high piers, the construction efficiency will be greatly improved. By setting a discharge system on the aqueduct, the longitudinal frame and the formwork system are lowered to realize the demoulding of the formwork system and to prepare for reuse in the replacement of the construction position, which improves the construction efficiency and reduces the construction cost. The various steps of the cast-in-place support method for aqueduct are closely coordinated, which reduces the construction cost, reduces the construction area, and improves the construction efficiency and construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a flow chart of the cast-in-place support method for aqueduct.

[0026] Figure 2 It is a schematic diagram of the main structure of the cast-in-situ support method for aqueduct of the present invention during the construction process.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 It is a side structural schematic diagram of the cast-in-place support method for aqueduct of the present invention during the construction process.

[0029] Figure 5 It is a schematic diagram of the top view of the structure of the cast-in-situ support method for aqueduct of the present invention during the construction process.

[0030] Figure 6 It is a structural schematic diagram of the cast-in-place support method for aqueduct of the present invention during the demoulding and dismantling process.

[0031] The symbols in the figure represent:

[0032] 1. Cap beam; 11. Pier; 2. Hanging parts; 21. Horizontal hanging parts; 3. Vertical frame; 4. Lifting and adjusting mechanism; 41. Screw; 42. Adjusting nut; 43. Horizontal hanging beam; 5. Pull rod; 51. Longitudinal pipe; 52. Fixing nut; 6. Formwork system; 61. Horizontal distribution beam; 62. Guardrail; 7. Horizontal limiter; 8. Unloading system; 81. Crossbeam; 82. Hoist; 9. Aqueduct. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] As shown in the present disclosure and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0035] Figures 1 to 6 An embodiment of the cast-in-place support method for an aqueduct of the present invention is shown, and the cast-in-place support method for an aqueduct comprises the following steps:

[0036] S1, casting of cap beam 1: casting cap beam 1 on the top of pier column 11, and pre-embedding longitudinal pipe 51 in cap beam 1, so that longitudinal pipe 51 runs through both sides of cap beam 1;

[0037] S2. Installation of the hanging member 2: The hanging member 2 is hung on the front and rear sides of the cap beam 1; the tie rod 5 is inserted into the longitudinal pipe 51, so that the two ends of the tie rod 5 extend from the two ends of the longitudinal pipe 51 respectively; the hanging member 2 is fixed to the end of the tie rod 5;

[0038] S3, installation of the longitudinal frame 3: installing the lifting and adjusting mechanism 4 at the lower end of the hanging member 2, and setting the longitudinal frame 3 between the cap beams 1 of two adjacent piers 11, so that the two ends of the longitudinal frame 3 are respectively set on the lifting and adjusting mechanism 4 on the corresponding cap beam 1;

[0039] S4, installation of the template system 6: installing the template system 6 on the top of the vertical frame 3, and adjusting the template system 6 to the vertical template height through the lifting and adjusting mechanism 4;

[0040] S5, pouring of aqueduct 9: pouring aqueduct 9 on formwork system 6, so that both ends of aqueduct 9 are supported on cap beams 1 of two adjacent piers 11 respectively;

[0041] S6, installation of the unloading system 8: the unloading system 8 is respectively installed between the two ends of the aqueduct 9 and the two ends of the longitudinal frame 3;

[0042] S7, demolding and removal: After tightening the longitudinal frame 3 through the unloading system 8, remove the connection between the longitudinal frame 3 and the lifting and adjusting mechanism 4, and then lower the longitudinal frame 3 by the unloading system 8 to a proper distance, so that the formwork system 6 on the longitudinal frame 3 is separated from the aqueduct 9, and the demolding is achieved; then, the longitudinal frame 3 is further lowered to the ground through the unloading system 8, and then the longitudinal frame 3 and the formwork system 6 are removed.

[0043] In the cast-in-place support method for aqueduct, when the formwork is erected, the longitudinal frame 3 is suspended by the hanging member 2 to support the formwork system 6, which does not fall to the ground and is not limited by the height of the pier column 11. When the pier is high, there is no need to increase the height structure, the construction cost is low and the period is short, and the formwork system 6 is adjusted to the formwork height by the lifting and adjusting mechanism 4, which improves the efficiency of the formwork and the accuracy of the formwork position, thereby improving the construction quality. By making full use of the principle of mechanics, the pull rod 5 is temporarily tied, and the hanging member 2 is used to convert the structural force from the vertical force of the hanging member 2 to the horizontal force of the pull rod 5, which reduces manual operation, improves the safety of construction, improves the efficiency of installation and removal, and can be reused, especially for the construction of aqueduct with high piers, the construction efficiency will be greatly improved. By setting the unloading system 8 on the aqueduct 9, the longitudinal frame 3 and the formwork system 6 are lowered to realize the demoulding of the formwork system 6 and to prepare for the reuse of the replacement construction position, the construction efficiency is improved and the construction cost is reduced. The various steps of the cast-in-place support method for aqueduct are closely coordinated, which reduces the construction cost, reduces the construction area, and improves the construction efficiency and construction quality.

[0044] In this embodiment, Figure 3 and Figure 4 As shown, in S3, the lifting and adjusting mechanism 4 includes a screw rod 41, an adjusting nut 42 and a transverse hanging beam 43. The top end of the screw rod 41 is first fixed to the hanging member 2, and then the transverse hanging beam 43 is sleeved on the screw rod 41 and clamped and fixed by the adjusting nut 42, and then the two ends of the longitudinal frame 3 are respectively placed on the corresponding transverse hanging beam 43. The longitudinal frame 3 is suspended in the longitudinal direction by the screw rod 41, the adjusting nut 42 and the transverse hanging beam 43, which is convenient for construction and disassembly, and the height of the longitudinal frame 3 relative to the ground can be adjusted by screwing the adjusting nut 42 to adjust the mold height of the template system 6 on the longitudinal frame 3, which is convenient for mold erection.

[0045] In this embodiment, Figure 3 As shown, in S2, the top of the hanging member 2 is provided with a horizontal hanging portion 21, and the horizontal hanging portion 21 is hung on the top surface of the cap beam 1. In this way, the hanging member 2 can not only be subjected to the force of the pull rod 5, but also to the force of the top surface of the cap beam 1 supporting upward, thereby improving the load-bearing strength of the hanging member 2 and reducing the force strength of the pull rod 5.

[0046] In this embodiment, in S2, the hanging member 2 is fixed to the tie rod 5 by a fixing nut 52. Specifically, both ends of the tie rod 5 are provided with external threads, and the fixing nut 52 is connected to the external threads at the ends of the tie rod 5. The ends of the tie rod 5 pass through the hanging member 2, and the fixing nut 52 presses the hanging member 2 onto the cap beam 1 from the outer side of the hanging member 2.

[0047] In this embodiment, the hangers 2 on both sides of the cap beam 1 are simultaneously installed on the tie rod 5. The spiral directions of the two ends of the tie rod 5 are opposite, so when the hangers 2 on both sides of the cap beam 1 are simultaneously installed on the tie rod 5, the fixing nuts 52 of the tie rod 5 are tightened at the same time, which can simultaneously press the hangers 2 on both sides of the cap beam 1 onto the cap beam 1, making the installation operation more convenient and quick.

[0048] In this embodiment, Figure 4 As shown, in S6, the unloading system 8 includes a crossbeam 81 and two hoists 82. The crossbeam 81 is first arranged on the top surface of the aqueduct 9, so that the two ends of the crossbeam 81 extend from the two sides of the aqueduct 9 respectively, and then hoists 82 are installed at the two ends of the crossbeam 81, and the hoists 82 are respectively arranged on the two sides of the longitudinal frame 3. The crossbeam 81 is arranged on the top surface of the aqueduct 9, which is convenient for operation. The two ends of the crossbeam 81 are connected to the two sides of the longitudinal frame 3 through the hoists 82 respectively, and the two sides of the longitudinal frame 3 are stressed to prevent overturning, and the stability is good. The hoist 82 is a fall chain.

[0049] In this embodiment, in S4, after lateral distribution beams 61 are arranged at intervals along the length direction on the top surface of the longitudinal frame 3, the formwork system 6 is installed on the top of each lateral distribution beam 61. The longitudinal frame 3 adopts a Bailey beam support. The lateral distribution beam 61 is fixed to the longitudinal frame 3 by U-bolts. After the formwork system 6 is installed, the strength is tested by the preloading method.

[0050] The cast-in-place support method of the aqueduct specifically comprises the following steps:

[0051] S1. Casting of cap beam 1: When casting the cap beam 1 concrete, the position of the tie rod hole is designed to be consistent with the position of the tie rod 5, and the hole is formed in the longitudinal pipe 51 (PVC pipe) pre-buried when casting the cap beam 1;

[0052] S2. Installation of the hanging parts 2: The hanging parts 2 are processed by professional manufacturers. After the concrete of the cap beam 1 reaches the design strength, the hanging parts 2 are installed and the tie rods 5 are installed to fix them;

[0053] S3, installation of the longitudinal frame 3: install a hanging screw 41 (finished rolled threaded steel bar) at the lower end of the hanging member 2, and then install the transverse hanging beam 43. Double adjustment nuts 42 are installed at the upper and lower ends of the screw 41. The elevation of the transverse hanging beam 43 can be adjusted by the double adjustment nuts 42; install the longitudinal frame 3 between the hanging members 2 of two adjacent piers 11, the longitudinal frame 3 is supported on the transverse hanging beam 43, and a transverse limiter 7 is provided;

[0054] S4, installation of the formwork system 6: install the transverse distribution beam 61 and the formwork system 6 on the top of the longitudinal frame 3, and install the guardrail 62 on the transverse distribution beam 61;

[0055] S5, pouring concrete for aqueduct 9: after the formwork system 6 is installed, help tie the steel bars and pour concrete for aqueduct 9;

[0056] S6, installation of the unloading system 8: after the concrete pouring of the aqueduct 9 is completed, the top crossbeam 81 of the aqueduct 9 is installed, and a limiter is set inside the aqueduct 9, and a fall chain is used to connect the top crossbeam 81 of the aqueduct 9 and the longitudinal frame 3;

[0057] S7, demolding and dismantling: After the concrete of the aqueduct 9 reaches the designed strength, pre-tighten the fall chain, remove the adjusting nuts 42 at the upper and lower ends of the screw rod 41, lower the fall chain about 5 cm, the formwork system 6 is separated from the concrete of the aqueduct 9, continue to lower the fall chain to the ground, and the crossbeam 81, the longitudinal frame 3 and the formwork system 6 are lowered to the ground together with the fall chain; then remove the pull rod 5 and the hanging piece 2 and transport them to the next span for standby use.

[0058] Two layers of tie rods 5 are provided, with a total of 8 tie rods 5. In step S2, the hanging member 2 is made of steel plate and processed by a professional manufacturer, and a hole needs to be opened at the position of the tie rod 5, and the hole should be slightly larger than the diameter of the tie rod 5 for the end of the tie rod 5 to pass through.

[0059] The horizontal hanging part 21 and the hanging member 2 are welded at 90 degrees to form an L shape, so that the hanging member 2 is in close contact with the top and side surfaces of the cap beam 1 at the same time. The hanging members 2 on both sides should be at the same elevation position to facilitate the connection of the pull rod 5.

[0060] In this embodiment, the hanging part 2 is processed by a professional manufacturer, the material is Q345, the plate thickness is 12-30mm, and the pad at the bottom of the hanging part 2 is about 30mm away from the edge of the cap beam 1 to prevent the corner of the cap beam 1 from being crushed. The pull rod 5 is made of JL25 precision rolled threaded steel bar, and the corresponding hanging part 2 has a φ50mm hole.

[0061] In step S7, the fall chain is first pre-tightened so that the weight of the longitudinal frame 3 is borne by the fall chain, and the adjusting nut 42 at the lower side of the screw rod 41 is removed, and the fall chain is gradually lowered to separate the concrete of the aqueduct 9 from the formwork, and then the hanging parts 2 are removed and placed on the formwork system 6 (the hanging parts 2 on the side of the completed previous span are removed and unloaded together with the longitudinal frame 3, and the hanging parts 2 on the side of the next span are not removed), and the fall chain is gradually loosened until the bracket is lowered to the ground, and the longitudinal frame 3 is not disassembled, that is, it is moved as a whole to the next span for use.

[0062] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cast-in-place aqueduct support method, characterized in that: The steps include: S1. Casting of the cap beam (1): Casting the cap beam (1) on the top of the pier column (11), and pre-embedding a longitudinal pipe (51) in the cap beam (1), so that the longitudinal pipe (51) runs through both sides of the cap beam (1); S2, installation of the hanging member (2): the hanging member (2) is hung on the front and rear sides of the cap beam (1); the pull rod (5) is inserted into the longitudinal pipe (51), so that the two ends of the pull rod (5) extend from the two ends of the longitudinal pipe (51) respectively; the hanging member (2) is fixed to the end of the pull rod (5); in S2, the top end of the hanging member (2) is provided with a horizontal hanging part (21), and the horizontal hanging part (21) is hung on the top surface of the cap beam (1); S3, installation of the longitudinal frame (3): installing a lifting and adjusting mechanism (4) at the lower end of the hanging member (2), and setting the longitudinal frame (3) between the cap beams (1) of two adjacent piers (11), so that the two ends of the longitudinal frame (3) are respectively set on the lifting and adjusting mechanism (4) on the corresponding cap beam (1); in S3, the lifting and adjusting mechanism (4) includes a screw rod (41), an adjusting nut (42) and a transverse hanging beam (43), firstly fixing the top end of the screw rod (41) on the hanging member (2), then putting the transverse hanging beam (43) on the screw rod (41) and clamping and fixing it through the adjusting nut (42), and then placing the two ends of the longitudinal frame (3) on the corresponding transverse hanging beam (43); S4, installation of the formwork system (6): installing the formwork system (6) on the top of the longitudinal frame (3), and adjusting the formwork system (6) to the vertical formwork height through the lifting and adjusting mechanism (4); S5, pouring the aqueduct (9): pouring the aqueduct (9) on the formwork system (6), so that both ends of the aqueduct (9) are supported on the cap beams (1) of two adjacent piers (11); S6, installation of the unloading system (8): the unloading system (8) is respectively installed between the two ends of the aqueduct (9) and the two ends of the longitudinal frame (3); S7, demolding and dismantling: After the longitudinal frame (3) is tightened by the unloading system (8), the connection between the longitudinal frame (3) and the lifting and adjusting mechanism (4) is removed, and then the longitudinal frame (3) is lowered by the unloading system (8) to a suitable distance, so that the template system (6) on the longitudinal frame (3) is separated from the aqueduct (9), thereby achieving demolding; then, the longitudinal frame (3) is further lowered to the ground by the unloading system (8), and the longitudinal frame (3) and the template system (6) are dismantled.

2. The cast-in-place support method for aqueduct according to claim 1, characterized in that: In S2, the hanging member (2) is fixed to the pull rod (5) via a fixing nut (52).

3. The cast-in-place support method for aqueduct according to claim 2, characterized in that: The hanging parts (2) on both sides of the cap beam (1) are simultaneously installed on the pull rod (5).

4. The cast-in-situ support method for aqueduct according to claim 1, characterized in that: In the above-mentioned S6, the unloading system (8) includes a cross beam (81) and two elevators (82). The cross beam (81) is firstly arranged on the top surface of the aqueduct (9), so that the two ends of the cross beam (81) extend from the two sides of the aqueduct (9), and then the elevators (82) are installed at the two ends of the cross beam (81), and the elevators (82) are respectively arranged on the two sides of the longitudinal frame (3).

5. The cast-in-situ support method for aqueduct according to claim 1, characterized in that: In the above S4, after arranging transverse distribution beams (61) at intervals along the length direction on the top surface of the longitudinal frame (3), the formwork system (6) is installed on the top of each transverse distribution beam (61).

6. The cast-in-situ aqueduct support method according to claim 5, characterized in that: The longitudinal frame (3) adopts a Bailey beam support.

7. The cast-in-situ aqueduct support method according to claim 6, characterized in that: The transverse distribution beam (61) is fixed to the longitudinal frame (3) by means of U-shaped bolts.

8. The cast-in-situ aqueduct support method according to claim 5, characterized in that: After the formwork system (6) is installed, the strength is tested using the preloading method.

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