Lower bearing box girder type cantilever girder manufacturing machine and construction method

Abstract

The invention provides a lower bearing box girder type cantilever girder manufacturing machine which comprises an inverted-U-shaped portal frame and a walking mechanism, an opening of the inverted-U-shaped portal frame is arranged downwards, main box girders are fixedly connected to the two sides of the opening downwards, the main box girders on the two sides are parallel and are perpendicular to the inverted-U-shaped portal frame, and the walking mechanism comprises an on-girder walking system, a reverse jacking system and limiting wheels. The main box girder is of an inverted-I-shaped structure and comprises an upper cross beam, a lower cross beam and a vertical beam which are all of a box beam structure, the upper cross beam and the lower cross beam are fixedly connected to the two ends of the vertical beam respectively, a rear fulcrum support and a reverse jacking system are arranged at the rear end of the upper cross beam, and a limiting wheel is arranged at the rear end of the inner side of the upper cross beam. The invention has the beneficial effects that through the unique design of the lower bearing box girder, the front and rear U-shaped gantries are saved, and the operation interference on the upper part of the bridge beam surface is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a cantilever beam-making machine with a lower box beam and a construction method. Background Art

[0002] Traditional bridge construction methods have problems such as low construction efficiency and difficulty in quality control when facing large spans and complex terrains. New bridge construction equipment is urgently needed to meet construction needs. The structural form of traditional beam-making machines cannot adapt well to the special requirements of bridge construction in some cases. For example, some top-supported beam-making machines may cause the center of gravity to move upward and the stability to deteriorate due to the excessive height of the structure when constructing large spans. In addition, there are many operating interferences on the upper part of the beam surface of the top-supported beam-making machine, which is not conducive to the standardized organization of construction on site, and the main beam is heavy and the economy is poor. Summary of the invention

[0003] In view of this, the present invention aims to overcome the deficiencies of the above-mentioned problems in the prior art and proposes a cantilever beam-making machine with a lower box beam and a construction method.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A cantilever beam-making machine with a box beam under support comprises an inverted U-shaped gantry and a running mechanism. The inverted U-shaped gantry is opened downward and main box beams are fixed downward on both sides of the opening. The main box beams on both sides are parallel and vertically arranged on the inverted U-shaped gantry. The running mechanism comprises a running system on the beam, a reverse top system and a limit wheel.

[0006] The main box beam is an inverted I-shaped structure, and includes an upper cross beam, a lower cross beam and a vertical beam, all of which are box beam structures. The upper cross beam and the lower cross beam are respectively fixed at both ends of the vertical beam. A rear support point support and an anti-top system are provided at the rear end of the upper cross beam, and a limiting wheel is provided at the inner rear end.

[0007] The inverted U-shaped gantry is connected to the horizontally arranged beam running system and can move forward and backward along the beam running system; each main box girder is provided with an outer mold demoulding system connected to the outer membrane system; the outer membrane system, the bottom mold system and the inner membrane system located on the inner side of the outer membrane system are all fixedly connected to the upper side of the bottom platform, and the inner membrane system is arranged on the upper side of the bottom mold system.

[0008] The present application also provides a construction method of a cantilever beam-making machine with a bottom-supported box beam, comprising the following steps:

[0009] S1. Pour the first section of concrete and remove the end formwork after the concrete reaches the designed strength;

[0010] S2. Demoulding of the bottom mould system: lower the bottom mould to the concrete surface by adjusting the through-hole jack of the suspension system of the bottom platform, and then remove the suspension rod of the suspension system at the rear middle part of the bottom platform;

[0011] S3. Demolding the outer formwork system, by first moving the outer formwork system laterally outward and then vertically downward through the outer formwork demoulding system, so that the outer formwork system is separated from the concrete surface;

[0012] S4. Demoulding the inner mould system: first fold the inner mould by using the turning cylinder on the inner mould system, then lower the inner mould by adjusting the through-hole jack of the inner sliding beam suspension system, and then move the inner mould inward by using the transverse cylinder to separate the inner mould from the concrete surface;

[0013] S5. Extend the running beam of the running mechanism and fix it with bolts;

[0014] S6. Loosen the anchor system and adjust the rear support point to lower it so that the anti-top system contacts the poured concrete flange;

[0015] S7. Fix the inner mold sliding hanger rod, remove the inner mold sliding beam fixed hanger rod and anchor system around the inner mold sliding hanger rod;

[0016] S8. Push the front slide through the traveling mechanism to drive the inverted U-shaped gantry, bottom mold system, outer mold system, and inner mold system to move forward together;

[0017] S9. After the inverted U-shaped gantry is moved into position, the anchoring system is installed, and the suspension rod of the suspension system at the rear middle part of the bottom platform is installed;

[0018] S10. Drive the inner mold pulley to make the inner mold return to the first segment box, leaving space for tying the reinforcement of the second segment bottom plate and web;

[0019] S11. Adjust the rear support elevation until it contacts the poured concrete flange, while keeping the main box girder horizontal;

[0020] S12. Measure and adjust the elevation of the bottom formwork system and the outer formwork system, and tie the bottom plate and web reinforcement;

[0021] S13. Drive the inner mold pulley to move the inner mold system to the designed position, and anchor the inner mold sliding beam to the concrete beam;

[0022] S14. Adjust the elevation of the inner formwork system, tie the top plate reinforcement, and then pour the second section concrete;

[0023] S15. Repeat the above steps to complete the concrete pouring of all segments.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present invention saves front and rear U-shaped portal frames through a unique lower supporting box girder design, utilizes the main structure, cancels the rear anchorage, adopts anti-top wheels for traveling, and adopts rear fulcrum support for hard support during casting. It has no risk of overturning, is convenient for processing, simple for transportation, can be quickly installed and disassembled, has strong reversibility, has little impact on space, has little interference with operations on the upper part of the bridge beam surface, and is convenient for standardized on-site layout and construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a cantilever beam-making machine with a bottom-supported box beam according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the inner structure of a cantilever beam-making machine with a bottom-supported box beam according to an embodiment of the present invention;

[0029] Figure 3 for Figure 1 1-1 sectional view;

[0030] Figure 4 for Figure 1 2-2 sectional view in FIG.

[0031] Figure 5 for Figure 1 4-4 sectional view;

[0032] Figure 6 for Figure 1 3-3 and 5-5 section views.

[0033] Description of reference numerals:

[0034] 1. Main box girder; 2. Front upper crossbeam; 3. Inverted U-shaped gantry; 4. Suspension system; 5. Bottom platform; 6. Bottom mold system; 7. External mold system; 8. Internal mold system; 9. Anchoring system; 10. Traveling system; 11. External mold demoulding system; 12. Anti-top system; 13. Limiting wheel; 14. Rear fulcrum support. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0039] As shown in the figure, a cantilever beam-making machine with a lower box beam is provided, comprising an inverted U-shaped portal frame 3 and a running mechanism. The inverted U-shaped portal frame 3 is opened downwardly and is fixedly connected downwardly with a main box beam 1 at both sides of the opening. The main box beams 1 on both sides are parallel and vertically arranged with the inverted U-shaped portal frame 3. The main box beam 1 and the inverted U-shaped portal frame 3 are fixedly connected together by an anchoring system 9. The running mechanism comprises a running system 10 on the beam, an anti-top system 12 and a limiting wheel 13. The main box beam 1 is an inverted I-shaped structure and comprises an upper cross beam, a lower cross beam and a vertical beam, all of which are box beam structures. The horizontal beam and the lower horizontal beam are fixedly connected to the two ends of the vertical beam respectively, and a rear fulcrum support 14 and an anti-top system 12 are provided at the rear end of the upper horizontal beam, and a limiting wheel 13 is provided at the inner rear end; the inverted U-shaped gantry 3 is connected to the horizontally arranged upper beam running system 10, and can move forward and backward along the upper beam running system 10; each main box beam 1 is provided with an outer mold demoulding system 11 connected to the outer membrane system, and the outer membrane system, the bottom mold system 6 and the inner membrane system located on the inner side of the outer membrane system are all fixedly connected to the upper side of the bottom platform 5, and the inner membrane system is arranged on the upper side of the bottom mold system 6. In this embodiment, the bottom platform 5 and the upper part of the outer mold system 7 are connected together by the suspension system 4, the bottom membrane system, the bottom platform 5 and the inner membrane system are also connected together by the suspension system 4, and the bottom platform 5 and the main box beam 1 are also fixedly connected together by the suspension system 4. In addition, a front upper cross beam 2 is provided between the front ends of the two main box girders 1, the front end of the bottom platform 5 is hung on the front upper cross beam 2 through the suspension system 4, the rear end of the bottom formwork system 6 is hung on the main box girder 1 through the suspension system 4, and the inner formwork system 8 is suspended on the front end of the poured segment concrete and the inner formwork slideway beam.

[0040] In this embodiment, the bottom mold system 6 includes a bottom mold back rib and a bottom mold plate; the outer mold system 7 includes an outer guide beam, an outer mold main rib, an outer mold side truss, an outer mold upper flange truss, a back rib, and an outer mold plate structure; the inner mold system 8 includes an inner sliding beam, an inner mold main rib, an inner mold truss, an inner mold running beam, a back rib, and an inner mold plate structure; the suspension system 4 includes a front suspension rod of the bottom platform 5, a front suspension rod of the inner sliding beam, a rear suspension rod of the inner sliding beam, a rear suspension rod of the bottom platform 5, a rear middle suspension rod of the bottom platform 5, and a lower cross beam lifting lug; the anchoring system 9 includes an anchor beam, an anchor rod, and a lifting lug; the running mechanism includes a running system 10 on the beam, a reverse top system 12, and a limit wheel 13, and the reverse top system 12 includes a reverse top wheel. The structures are all welded with steel sections and steel plates, and are processed and manufactured in blocks. After being transported to the site, they are assembled into a whole.

[0041] The present application also provides a construction method of a cantilever beam-making machine with a bottom-supported box beam, comprising the following steps:

[0042] S1. Pour the first section of concrete and remove the end formwork after the concrete reaches the designed strength;

[0043] S2. Demolding the bottom mold system 6, by adjusting the bottom platform 5 of the suspension system 4 through the jack, the bottom mold lowered to the concrete surface, and then remove the bottom platform 5 after the middle part of the suspension system 4 of the boom;

[0044] S3. Demolding the outer mold system 7, the outer mold system 7 is first moved laterally outward and then vertically lowered through the outer mold demolding system 11, so that the outer mold system 7 is separated from the concrete surface;

[0045] S4. Demolding the inner mold system 8, first fold the inner mold by the flip cylinder on the inner mold system 8, and then lower the inner mold by adjusting the inner sliding beam suspension system 4 through the jack, and then move the inner mold inward by the lateral cylinder to separate the inner mold from the concrete surface;

[0046] S5. Extend the running beam of the running mechanism and fix it with bolts;

[0047] S6. Relax the anchoring system 9, adjust the rear fulcrum support 14 to drop so that the anti-top system 12 is in contact with the poured concrete flange;

[0048] S7. Fix the inner mold sliding hanger hanger rod, remove the inner mold sliding hanger hanger rod around the inner mold sliding beam fixed hanger hanger rod and anchor system 9;

[0049] S8. Push the front slide through the traveling mechanism to drive the inverted U-shaped gantry 3, the bottom mold system 6, the outer mold system 7, and the inner mold system 8 to move forward together;

[0050] S9. After the inverted U-shaped gantry 3 is moved into place, the anchoring system 9 is installed, and the hanger of the suspension system 4 at the middle part of the bottom platform 5 is installed;

[0051] S10. Drive the inner mold pulley to make the inner mold return to the first segment box, leaving space for tying the reinforcement of the second segment bottom plate and web;

[0052] S11. Adjust the elevation of the rear fulcrum support 14 until it contacts the poured concrete flange, while keeping the main box girder 1 horizontal;

[0053] S12. Measure and adjust the elevation of the bottom formwork system 6 and the outer formwork system 7, and tie the bottom plate and web reinforcement;

[0054] S13 drives the inner mold pulley, so that the inner mold system 8 moves to the designed position, and the inner mold slide beam is fixed to the hanger hanger anchored on the concrete beam;

[0055] S14. After adjusting the elevation of the inner formwork system 8, tie the top plate reinforcement, and then pour the second section of concrete;

[0056] S15. Repeat the above steps to complete the concrete pouring of all segments.

[0057] The present invention saves front and rear U-shaped portal frames through a unique lower supporting box beam design, utilizes the main structure, cancels the rear anchoring, adopts anti-top wheels for traveling, and adopts rear fulcrum support 14 for hard support during casting. It has no overturning risk, is convenient for processing, simple for transportation, can be quickly installed and disassembled, has strong reversibility, has little impact on space, has little interference with operations on the upper part of the bridge beam surface, and is convenient for standardized on-site layout and construction operations.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cantilever beam making machine with a box beam as support, characterized in that: It includes an inverted U-shaped gantry and a running mechanism. The opening of the inverted U-shaped gantry is set downward, and main box beams are fixed downward on both sides of the opening. The main box beams on both sides are parallel and vertically arranged to the inverted U-shaped gantry. The running mechanism includes a running system on the beam, an anti-top system and a limit wheel. The main box beam is an inverted I-shaped structure, and includes an upper cross beam, a lower cross beam and a vertical beam, all of which are box beam structures. The upper cross beam and the lower cross beam are respectively fixed at both ends of the vertical beam. A rear support point support and an anti-top system are provided at the rear end of the upper cross beam, and a limiting wheel is provided at the inner rear end. The inverted U-shaped gantry is connected to the horizontally arranged beam running system and can move forward and backward along the beam running system; each main box girder is provided with an outer mold demoulding system connected to the outer membrane system; the outer membrane system, the bottom mold system and the inner membrane system located on the inner side of the outer membrane system are all fixedly connected to the upper side of the bottom platform, and the inner membrane system is arranged on the upper side of the bottom mold system.

2. A construction method using the cantilever beam-making machine with a box beam as claimed in claim 1, characterized in that: The following steps are involved: S1. Pour the first section of concrete and remove the end formwork after the concrete reaches the designed strength; S2. Demoulding of the bottom mould system: lower the bottom mould to the concrete surface by adjusting the through-hole jack of the suspension system of the bottom platform, and then remove the suspension rod of the suspension system at the rear middle part of the bottom platform; S3. Demolding the outer formwork system, by first moving the outer formwork system laterally outward and then vertically downward through the outer formwork demoulding system, so that the outer formwork system is separated from the concrete surface; S4. Demoulding the inner mould system: first fold the inner mould by using the turning cylinder on the inner mould system, then lower the inner mould by adjusting the through-hole jack of the inner sliding beam suspension system, and then move the inner mould inward by using the transverse cylinder to separate the inner mould from the concrete surface; S5. Extend the running beam of the running mechanism and fix it with bolts; S6. Loosen the anchor system and adjust the rear support point to lower it so that the anti-top system contacts the poured concrete flange; S7. Fix the inner mold sliding hanger rod, remove the inner mold sliding beam fixed hanger rod and anchor system around the inner mold sliding hanger rod; S8. Push the front slide through the traveling mechanism to drive the inverted U-shaped gantry, bottom mold system, outer mold system, and inner mold system to move forward together; S9. After the inverted U-shaped gantry is moved into position, the anchoring system is installed, and the suspension rod of the suspension system at the rear middle part of the bottom platform is installed; S10. Drive the inner mold pulley to make the inner mold return to the first segment box, leaving space for tying the reinforcement of the second segment bottom plate and web; S11. Adjust the rear support elevation until it contacts the poured concrete flange, while keeping the main box girder horizontal; S12. Measure and adjust the elevation of the bottom formwork system and the outer formwork system, and tie the bottom plate and web reinforcement; S13. Drive the inner mold pulley to move the inner mold system to the designed position, and anchor the inner mold sliding beam to the concrete beam; S14. Adjust the elevation of the inner formwork system, tie the top plate reinforcement, and then pour the second section concrete; S15. Repeat the above steps to complete the concrete pouring of all segments.

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