Method for erecting waterside high-altitude cast-in-place concrete corbel support combined type steel formwork

Abstract

The invention discloses a method for erecting a waterside high-altitude cast-in-place concrete bracket support combined steel formwork. The method comprises the following steps that S1, drilling and pouring are conducted; s2, cast-in-place of a lower cross beam; s3, a harbor basin is excavated, and slope protection is conducted; s4, a formwork supporting system is built; s5, a full-space supporting bracket is built; s6, a concrete formwork is built; s7, concrete is poured; and S7, concrete is poured. The concrete corbel supporting combined type steel formwork erected through the erecting method is stable in structure and sufficient in compressive strength, and the problem of erecting of a near-water high-altitude cast-in-place mass concrete formwork on a pile foundation provided with a permanent steel casing during beach cutting retreating and port building is solved; and the method can also be used for erecting a similar waterside high-altitude cast-in-place mass concrete formwork on a steel pipe pile foundation.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, in particular to a method for erecting a combined steel formwork supported by high-altitude cast-in-place concrete corbels near water. Background Art

[0002] In civil engineering, transportation, water conservancy and other projects, large-volume concrete structures are often used as the main load-bearing components. When pouring large-volume concrete, the bottom and sides of the concrete formwork are respectively subjected to large vertical and lateral pressures. In order to prevent the formwork from expanding and concrete leaking, higher requirements are placed on the formwork system.

[0003] When large-volume concrete is cast-in-place, it is only necessary to reinforce its foundation to ensure the vertical bearing capacity requirements of the bottom formwork. Taking the high-pile beam-slab wharf constructed on dry land for port construction after beach cutting as an example, the wharf pile foundation can be bored and cast-in-place, and the lower crossbeam of the wharf can be cast-in-place on the ground. However, considering the need to leave sufficient working surface for beach cutting and port construction to facilitate the construction of the port slope protection, after the construction of the lower crossbeam is completed, the port basin needs to be excavated, the beach cutting and retreating form the port basin, and the slope protection construction can be carried out before the next process can be carried out. Therefore, after the installation of the prefabricated longitudinal beams, the foundation concrete of the crane pier of the wharf faces the complex working condition of high-altitude pouring over water.

[0004] Conventional methods for suspended concrete pouring include building a ground-to-ground full-height bracket as a formwork support system. However, when the beach is cut and the port is built, the lower part of the formwork is an inclined slope, and the work is done near the water, so it is impossible to build a stable ground-to-ground full-height bracket. The second method is to set up a clamp on the pile foundation at the bottom of the dock platform as a formwork support. However, the bored pile foundation of dry land construction often has a permanent steel casing due to durability and appearance quality control requirements, which makes it inconvenient to set up a steel clamp. In addition, the clamp system has high cost and low turnover efficiency, which is not conducive to quality, cost and progress control. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a method for erecting a composite steel formwork with cast-in-place concrete corbel support near water.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The method for erecting a composite steel formwork for high-altitude cast-in-place concrete corbel support near water includes the following steps:

[0008] S1. Drilling and pouring: construct bored cast-in-place piles on the original ground as the wharf pile foundation, and set a permanent steel casing on the upper part during the pile foundation construction;

[0009] S2, cast-in-place lower cross beam: after bored cast-in-place piles are formed, formwork is set up on the original ground to cast the cast-in-place lower cross beam, and the concrete pouring of the cast-in-place lower cross beam is completed;

[0010] S3, excavate the harbor and protect the slopes; after the concrete strength meets the design requirements and the formwork is removed, the harbor is excavated. The construction of the temporary earth embankment of the harbor can be completed simultaneously when the cast-in-place lower crossbeam is constructed. The harbor is excavated by cutting the beach and retreating. The excavator retreats from the water side to the shore side to excavate the harbor in layers, and the slopes formed by the excavation are protected;

[0011] S4. Build the formwork support system; weld the supporting brackets on the side walls of the permanent protective tube, weld the supporting main beams on the supporting brackets, and weld the distribution beams on the supporting main beams;

[0012] S5. Build a full-hall support bracket; insert the vertical pole of the full-hall support bracket into the bracket vertical pole sleeve to fix it, and then set up the horizontal crossbar and scissors brace in sequence;

[0013] S6. Build a concrete formwork; the adjustable support is placed on the vertical pole, square timber is laid on the adjustable support, and a concrete bottom formwork and side formwork are set up on the square timber to form a crane foundation concrete formwork;

[0014] S7, pouring concrete: after the harbor excavation is completed and the harbor slope and slope protection construction are completed, the prefabricated longitudinal beams are hoisted and placed on the cast-in-place lower cross beams, the crane foundation concrete is constructed;

[0015] S8. Dismantling: After the crane foundation concrete strength meets the requirements, first dismantle the bottom formwork of the crane foundation concrete formwork, and then dismantle the full-floor support bracket, distribution beam, and supporting main beam in turn.

[0016] Preferably, in step S4, the supporting corbel is fully welded to the permanent steel casing on both sides, and the distance from the top elevation of the supporting corbel to the bottom elevation of the cast-in-place lower cross beam is "1.05 times to 4 times the sum of the heights of the I-beam of the supporting main beam and the I-beam of the distribution beam, and a rubber adjustment pad is pasted on the supporting corbel according to the distance.

[0017] Preferably, in step S4, the distance from the top elevation of the supporting corbel to the bottom elevation of the cast-in-place lower cross beam is set to be 1.05 to 4 times the sum of the heights of the supporting main beam I-beam and the distribution beam I-beam.

[0018] Preferably, in step S4, the supporting main beam stiffening ribs are welded on both sides of the web at the mid-span of the supporting main beam I-beam, perpendicular to the upper and lower flanges and the supporting main beam web. The supporting main beam stiffening ribs are arranged in a geometric progression at intervals of 15 cm, 30 cm, 60 cm, 120 cm, etc., centered on the mid-span of each supporting main beam I-beam.

[0019] Preferably, in step S4, the distribution beam is made of I-beam, perpendicular to the supporting main beam and evenly arranged on the upper flange of the supporting main beam, the distribution beam and the upper flange of the supporting main beam are fixed by spot welding, and the distribution beam and the supporting main beam are overlapped vertically and horizontally.

[0020] Preferably, in step S4, the distribution beam stiffening ribs are welded on both sides of the web at the mid-span of the distribution beam I-beam, perpendicular to the upper and lower flanges and the distribution beam web. The distribution beam stiffening ribs are arranged at intervals of 15 cm, 30 cm, 60 cm, 120 cm, etc., in a geometric progression, centered at the mid-span of the distribution beam I-beam.

[0021] Preferably, construction preparation is performed before step S1, and the construction preparation includes being familiar with the construction drawings, clarifying the design requirements and design dimensions, and ensuring that the required steel material meets the quality requirements.

[0022] Preferably, in step S7, the pouring needs to be uniformly fed, the pouring height is controlled, and the pouring speed is not more than 0.5 m per hour to prevent stress concentration from causing the crane foundation concrete formwork and support to deviate.

[0023] Preferably, in step S5, the full-hall support bracket includes a plurality of evenly arranged vertical support brackets, a plurality of horizontal support brackets are installed between the plurality of parallel arranged vertical support brackets, a plurality of horizontal cross bars are installed between the plurality of parallel arranged horizontal support brackets, and each horizontal cross bar is welded to a vertical support bracket corresponding to its position, and a scissors brace is installed on the full-hall support bracket.

[0024] Preferably, a first mounting hole and a second mounting hole are opened on the side wall of the vertical support frame, and the first mounting hole is connected to the second mounting hole, and the first mounting hole and the second mounting hole are vertically arranged, and the horizontal support frame is horizontally installed in the first mounting holes of multiple vertical support frames arranged in parallel, and the horizontal cross bar is horizontally installed in the second mounting holes of multiple vertical support frames.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The distribution beam and the supporting main beam are overlapped vertically and horizontally, and the distribution beam and the upper flange of the supporting main beam are fixed by electric welding, which effectively transfers the upper load to the supporting corbel in layers and evenly, ensuring the overall stability of the formwork supporting main beam system. The probability of deformation of the I-beam of the supporting main beam is reduced by adjusting the rubber cushion layer, and the supporting corbel is used to provide supporting force for the supporting main beam to improve the stability of the supporting structure.

[0027] 2. The moment distribution of the I-beam supporting the main beam is carried out to increase the density of the stiffening ribs of the main beam, and the moment distribution of the I-beam supporting the main beam is carried out to increase the density of the stiffening ribs of the distribution beam, which can improve the compressive strength of the structure and effectively ensure the compressive strength of the structure.

[0028] 3. The present invention provides a method for erecting a composite steel formwork supported by a corbel for high-altitude cast-in-place concrete near water, so as to solve the problem of erecting a high-altitude cast-in-place large-volume concrete formwork near water on a pile foundation with a permanent steel casing when building a port after beach cutting. The method can also be used for erecting a similar high-altitude cast-in-place large-volume concrete formwork near water on a steel pipe pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the overlapped and formed structure of the method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water proposed by the present invention;

[0030] Figure 2 It is an enlarged view of the structure of the full-height support bracket part in the lap forming of the combined steel formwork erection method for high-altitude cast-in-place concrete corbel support near water proposed by the present invention;

[0031] Figure 3 This is an enlarged view of the vertical support frame structure in the full-hall support bracket.

[0032] In the figure: 1 bored pile, 2 cast-in-place lower cross beam, 3 precast longitudinal beam, 4 permanent steel casing, 5 crane foundation concrete formwork, 6 distribution beam, 7 support bracket, 8 rubber adjustment pad, 9 support pole sleeve, 10 crane foundation, 11 support main beam, 12 full support bracket, 13 scissors brace;

[0033] 12 full-hall support bracket, 1201 vertical support frame, 1202 horizontal support frame, 1203 horizontal cross bar. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1-3 The method for erecting a composite steel formwork for high-altitude cast-in-place concrete corbel support near water specifically includes the following steps:

[0036] 1. Preparation work for beach cutting, retreating, port construction and formwork support main beam

[0037] Be familiar with the construction drawings, clarify the design requirements and design dimensions, and ensure that the required steel materials meet the quality requirements. In the construction of the high-pile beam-slab wharf by cutting the beach and retreating to excavate the port basin, the bored cast-in-place piles 1 should be constructed on the original ground as the wharf pile foundation. Due to the beach cutting and excavation, the upper covering soil of the bored cast-in-place piles 1 is removed, so that the upper part of the pile foundation is placed in water and air. In order to ensure the durability and appearance quality of the pile foundation and avoid mechanical damage to the steel bar protective layer of the pile foundation during the beach cutting and excavation process, a permanent steel casing 4 is set on the upper part during the pile foundation construction to ensure the durability of the structure and improve the appearance quality of the structure.

[0038] After the bored piles are formed, a formwork is set up on the original ground to cast the cast-in-place lower crossbeam 2. After the concrete pouring of the cast-in-place lower crossbeam is completed, the formwork is removed when the concrete strength meets the design requirements, and then the harbor is excavated. When the cast-in-place lower crossbeam 2 is constructed, the construction of the temporary earth embankment of the harbor can be completed simultaneously. The harbor is excavated by cutting the beach and retreating. The excavator retreats from the water side to the shore side to excavate the harbor in layers, and protects the slope formed by the excavation.

[0039] After excavation to 1m below the top elevation of bored pile 1, the excavated soil layer is used as the working surface, and the support bracket 7 is welded on the permanent steel casing 4. The support bracket 7 is fully welded to the permanent steel casing 4 on both sides. The distance from the top elevation of the support bracket 7 to the bottom elevation of the cast-in-place lower crossbeam 2 is "1.05 times to 4 times the sum of the heights of the I-beams of the supporting main beam 11 and the I-beams of the distribution beam 6". According to this distance, the rubber adjustment pad 8 is pasted on the support bracket 7. The distance from the top elevation of the support bracket 7 to the bottom elevation of the cast-in-place lower crossbeam 2 is set to exceed 1.05 times to 4 times the sum of the heights of the I-beams of the supporting main beam 11 and the I-beams of the distribution beam 6, so as to reserve space for pasting the rubber adjustment pad 8. The function of the rubber adjustment pad 8 is to enable the I-beam of the supporting main beam 11 to be close to the supporting corbel 7. When the I-beam of the supporting main beam 11 is deformed by force, the elastic adjustment of the rubber adjustment pad 8 ensures that the I-beam of the supporting main beam 11 is always close to the supporting corbel 7, ensuring that each supporting corbel 7 can provide supporting force for the supporting main beam 11 and ensure the stability of the supporting structure.

[0040] 2. Construction of formwork support system

[0041] The supporting main beam 11 is made of I-steel, which is placed on the supporting corbel 7 and the rubber adjustment cushion 8 after being laid out and positioned. The I-steel supporting the main beam 11 is spot welded to the supporting corbel 7 and fixed on the plane.

[0042] At the mid-span of the supporting main beam 11 I-beam, perpendicular to the upper and lower flanges and the web of the supporting main beam, the supporting main beam stiffening ribs are welded on both sides of the web. The supporting main beam stiffening ribs are arranged in a geometric progression at intervals of 15cm, 30cm, 60cm, 120cm, etc., with the mid-span of each supporting main beam 11 I-beam as the center. The supporting main beam stiffening ribs are densely arranged according to the bending moment distribution of the supporting main beam 11 I-beam, effectively improving its compressive strength.

[0043] The distribution beam 6 is made of I-beam, which is perpendicular to the supporting main beam 11 and evenly arranged on the upper flange of the supporting main beam. The distribution beam 6 and the upper flange of the supporting main beam are fixed by spot welding. The longitudinal and transverse overlap arrangement of the distribution beam 6 and the supporting main beam 11 effectively transfers the upper load to the supporting bracket 7 in layers and evenly, ensuring the overall stability of the template supporting main beam system. The bracket upright sleeve 9 is welded on the upper flange of the I-beam of the distribution beam 6 and evenly arranged according to the upper support.

[0044] At the mid-span of the distribution beam 6 I-beam, perpendicular to the upper and lower flanges and the web of the distribution beam, the distribution beam stiffening ribs are welded on both sides of the web. Centered on the mid-span of the distribution beam 6 I-beam, the distribution beam stiffening ribs are arranged in a geometric progression at intervals of 15cm, 30cm, 60cm, 120cm... in sequence. The distribution beam stiffening ribs are densely arranged according to the moment distribution of the distribution beam 6 I-beam, effectively improving its compressive strength.

[0045] 3. Construction of cast-in-place concrete formwork

[0046] After the harbor excavation is completed and the harbor slope and slope protection construction are completed, the prefabricated longitudinal beam 3 is hoisted and placed on the cast-in-place lower cross beam 2, and the crane foundation 6 concrete is constructed.

[0047] Insert the vertical pole of the full-floor support bracket 12 into the bracket vertical pole sleeve 9 and fix it, then set up the horizontal crossbar and scissors brace in sequence. The adjustable support is placed on the vertical pole, square wood is laid on the adjustable support, and concrete bottom mold and side mold are set up on the square wood to form the crane foundation concrete template.

[0048] When pouring concrete, a layered pouring method is adopted. The upper layer is poured after the lower layer has initially solidified to reduce the pressure on the formwork support system. The pouring requires uniform material feeding and controlled pouring height. The pouring speed is not more than 0.5m per hour to prevent stress concentration from causing the crane foundation concrete formwork 5 and support deviation. After the concrete strength of the crane foundation 6 meets the requirements, the bottom formwork of the crane foundation concrete formwork 5 is removed first, and then the full-span support bracket 12, distribution beam 6, and support main beam 11 are removed in turn to complete the high-altitude cast-in-place large-volume concrete formwork support and concrete pouring near the water.

[0049] It is worth mentioning that the reference Figure 2-3The full-hall support bracket 12 includes a plurality of evenly arranged vertical support frames 1201, a plurality of horizontal support frames 1202 are installed between the plurality of parallel vertical support frames 1201, a plurality of horizontal cross bars 1203 are installed between the plurality of parallel horizontal support frames 1202, and each horizontal cross bar 1203 is welded to the vertical support frame 1201 corresponding to the position, a scissors support 13 is installed on the full-hall support bracket 12, a first mounting hole and a second mounting hole are opened on the side wall of the vertical support frame 1201, and the first mounting hole is connected to the second mounting hole, and the first mounting hole and the second mounting hole are vertically arranged, and the horizontal support frame 1202 is horizontally installed in the first mounting hole of the plurality of parallel vertical support frames 1201, and the horizontal cross bar 1203 is horizontally installed in the second mounting hole of the plurality of vertical support frames 1201, and the welding points between different surfaces of the horizontal support frame 1202, the horizontal cross bar 1203 and the vertical support frame 1201 are increased, and the welding points are increased while the welding points are evenly distributed to ensure its supporting force.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for erecting a composite steel formwork supported by a corbel for high-altitude cast-in-place concrete near water, characterized in that: The following steps are involved: S1, drilling and pouring; Constructing bored cast-in-place piles (1) on the original ground as the wharf pile foundation, and installing a permanent steel casing (4) on the upper part during the pile foundation construction; S2, cast-in-place lower cross beam (2); after bored piles are formed, a formwork is set up on the original ground to cast the cast-in-place lower cross beam (2), and the casting of the cast-in-place lower cross beam concrete is completed; S3, excavating the harbor and protecting the slopes; after the concrete strength meets the design requirements and the formwork is removed, the harbor (4) is excavated, and the construction of the temporary earth embankment (5) of the harbor can be completed simultaneously when the cast-in-place lower crossbeam (2) is constructed. The harbor (4) is excavated by cutting the beach and retreating. The excavator retreats from the water side to the shore side to excavate the harbor in layers, and the slopes formed by the excavation are protected; S4. Build the formwork support system; A supporting bracket (7) is welded on the side wall of the permanent protective tube (4), a supporting main beam (11) is welded on the supporting bracket (7), and a distribution beam (6) is welded on the supporting main beam (11); S5, constructing a full-chair support bracket (12); inserting the vertical pole of the full-chair support bracket (12) into the bracket vertical pole sleeve (9) to fix; S6, constructing a concrete formwork, placing an adjustable support on the vertical pole, laying square timber on the adjustable support, and setting up a concrete bottom formwork and side formwork on the square timber to form a crane foundation concrete formwork (5); S7, pouring concrete; after the excavation of the harbor is completed and the construction of the harbor slope and slope protection is completed, the prefabricated longitudinal beam (3) is hoisted and placed on the cast-in-place lower cross beam (2), and the crane foundation (6) is constructed with concrete; S8, dismantling; after the concrete strength of the crane foundation (6) meets the requirements, first dismantle the bottom formwork of the crane foundation concrete formwork (5), and then dismantle the full-span support bracket (12), the distribution beam (6), and the supporting main beam (11) in sequence.

2. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1 is characterized in that: In the step S4, the supporting corbel (7) is fully welded to the permanent steel casing (4) on both sides, and the distance from the top elevation of the supporting corbel (7) to the bottom elevation of the cast-in-place lower cross beam 2 is 1.05 times to 4 times the sum of the heights of the I-beam of the supporting main beam (11) and the I-beam of the distribution beam (6), and the rubber adjustment pad (8) is pasted on the supporting corbel (7) according to the distance.

3. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1 is characterized in that: In step S4, the distance from the top elevation of the supporting corbel (7) to the bottom elevation of the cast-in-place lower cross beam (2) is set to be 1.05 to 4 times the sum of the heights of the I-beams of the supporting main beam (11) and the I-beams of the distribution beam (6).

4. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: In step S4, at the mid-span of the I-beam of the supporting main beam (11), perpendicular to the upper and lower flanges and the web of the supporting main beam, the supporting main beam stiffening ribs are welded on both sides of the web, and the supporting main beam stiffening ribs are arranged in a geometric progression at intervals of 15 cm, 30 cm, 60 cm, 120 cm, etc., centered on the mid-span of each I-beam of the supporting main beam (11).

5. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: In step S4, the distribution beam (6) is made of I-beam, perpendicular to the supporting main beam (11) and evenly arranged on the upper flange of the supporting main beam, the distribution beam (6) and the upper flange of the supporting main beam are fixed by spot welding, and the distribution beam (6) and the supporting main beam (11) are overlapped vertically and horizontally.

6. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: In step S4, the distribution beam stiffening ribs are welded on both sides of the web at the mid-span of the distribution beam (6) I-beam, perpendicular to the upper and lower flanges and the web of the distribution beam. The distribution beam stiffening ribs are arranged at intervals of 15 cm, 30 cm, 60 cm, 120 cm, etc. in a geometric progression, centered on the mid-span of the distribution beam (6) I-beam.

7. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: Before step S1, construction preparation is performed, which includes being familiar with the construction drawings, clarifying the design requirements and design dimensions, and ensuring that the required steel material meets the quality requirements.

8. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: In step S7, the pouring needs to be uniform, the pouring height is controlled, and the pouring speed is not more than 0.5 m per hour to prevent stress concentration from causing the crane foundation concrete formwork (5) and support to deviate.

9. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 1, characterized in that: In step S5, the full-hall support bracket (12) includes a plurality of evenly arranged vertical support brackets (1201), a plurality of horizontal support brackets (1202) are installed between the plurality of parallel vertical support brackets (1201), a plurality of horizontal cross bars (1203) are installed between the plurality of parallel horizontal support brackets (1202), and each horizontal cross bar (1203) is welded to a vertical support bracket (1201) corresponding to a position, and a scissors brace (13) is installed on the full-hall support bracket (12).

10. The method for erecting a combined steel formwork for high-altitude cast-in-place concrete corbel support near water according to claim 9, characterized in that: A first mounting hole and a second mounting hole are provided on the side wall of the vertical support frame (1201), and the first mounting hole is connected to the second mounting hole, and the first mounting hole and the second mounting hole are arranged vertically, and the horizontal support frame (1202) is horizontally installed in the first mounting hole of multiple vertical support frames (1201) arranged in parallel, and the horizontal cross bar (1203) is horizontally installed in the second mounting holes of the multiple vertical support frames (1201).

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