Large-span wide roof beam cast-in-place modular support

Abstract

The utility model relates to the technical field of bent cap support, concretely is a kind of large-span wide bent cap cast-in-place modularization support.The large-span wide bent cap cast-in-place modularization support includes pile foundation, multiple pile foundations are distributed with interval, and the outer wall of each pile foundation is all sleeved with casing;Corbel, at least the front and back sides of the outer wall of each casing are equipped with the corbel;Unloading block, the corbel on each side is all detachably equipped with the unloading block;Bailey beam, the unloading block on each side is all detachably equipped with the bailey beam;Bottom mould distribution beam, multiple bottom mould distribution beams are arranged with interval on the bailey beam, and the bottom mould distribution beam is horizontally arranged on the outer wall of the top end of the pile foundation;Cast-in-place bent cap, it is arranged on the bottom mould distribution beam.Through the structure of the above setting, large-span wide bent cap cast-in-place modularization support has the characteristics of large bearing capacity, high safety factor, adapt to different length bent cap construction, with the characteristics of modularization quick dismounting.

Description

Technical Field

[0001] This utility model relates to the field of cap beam support technology, specifically a large-span wide cap beam cast-in-place modular support. Background Technology

[0002] Currently, the substructures of domestic four-lane or six-lane highways, urban viaducts, or cross-sea bridges all adopt the classic cross-section structure of "drilled piles + embedded abutments + piers + cap beams." The cap beams play a crucial role in connecting the upper and lower sections, and are typically designed as two sets of independent rectangular cap beams for each direction to transfer the load from the bridge superstructure. Their design dimensions are generally length × width × height = 11.1m × 1.7m × 2.0m, with a casting volume of 37.74m³ for a single cap beam. 3 The weight is approximately 99 tons. Based on the self-weight load of the cap beam and the number and location of the support points below, the design scheme for the cast-in-place support of this cap beam is "lightweight clamp simple support". Points are measured and marked on the upper part of the pier column ①, and then clamps ② are installed on the measurement line as steel brackets. 12m long double-span I45 I-beams ③ are erected on the clamp brackets to form a support beam. The use of double-row I-beams is mainly to increase the bending capacity and overall strength of the I-beams and to increase the contact area with the clamps. The cantilevered part is supported by truss plates made of [8 channel steel ④, the side formwork uses shaped steel formwork, and the bottom formwork uses bakelite board ⑤. The cap beam clamp consists of two clamps, upper and lower, with a jack in the middle for lifting. Each clamp is composed of two semi-circular clamps. After installation on the column, the two semi-circular steel clamps have a 15mm gap at their joint surfaces to ensure effective and tight compression with the pier column after being connected by M30 high-strength bolts. The inner wall of the column clamp is covered with geotextile to protect the concrete at the contact surface with the column and to increase the friction between the column clamp and the pier column. After the cap beam reinforcement is tied, the side formwork is installed. The cap beam concrete is centrally mixed at the mixing plant and transported by tanker truck, lifted into the formwork by crane, and compacted by immersion vibrators.

[0003] While the aforementioned "lightweight clamp-type cast-in-place support system" has advantages such as light weight, easy assembly and disassembly, and reusability, it also has the following disadvantages: First, because the "lightweight clamp-type cast-in-place support system" provides upward support through the frictional force between the clamp and the pier, the calculated maximum load-bearing capacity of a single clamp is 60 tons. This load-bearing capacity cannot meet the construction load requirements of ultra-wide and ultra-high cap beams for heavy-load bridges in American design standards, which generally require a load-bearing capacity of 120 tons. Second, because the "lightweight clamp-type cast-in-place support system" uses ordinary steel to support the self-weight of the cap beam... The load transfer to the clamps is affected by the strength, stiffness, and stability of ordinary steel, which cannot meet the transverse construction load requirements of the American design standards for the cap beams of ultra-wide bridges; third, the maximum length of a single ordinary steel section is 12m, and ordinary steel is not equipped with modular assembly measures, which cannot meet the requirements for cast-in-place construction of cap beams of different lengths; fourth, using jacks as unloading devices for the double clamp support is inappropriate, because the jacks are unstable under oil pressure control. Once abnormal pressure is released during the concrete pouring process, it will have disastrous consequences for the construction of the cap beams and cause serious safety problems. Utility Model Content

[0004] The purpose of this utility model is to propose a modular support for cast-in-place large-span wide cap beams, which aims to solve the technical problems of existing "lightweight clamp cast-in-place supports" having low load-bearing capacity, strength, stiffness and stability, poor safety during unloading, and inability to meet the requirements of cast-in-place support for different cap beam lengths.

[0005] To achieve the above objectives, this utility model proposes a large-span wide-cap beam cast-in-place modular support, including pile foundations, multiple pile foundations are spaced apart, and each pile foundation is fitted with a protective sleeve on its outer wall; The outer wall of each of the casings is provided with at least the front and rear sides of the casing. The unloading block can be detachably installed on each of the two cow legs; The Bailey beam can be detachably mounted on the unloading block on each side; Bottom formwork distribution beams, multiple bottom formwork distribution beams are spaced apart on the Bailey beams, and the bottom formwork distribution beams are horizontally arranged on the outer wall of the top of the pile foundation; The cast-in-place cap beam is set on the bottom formwork distribution beam.

[0006] Preferably, the corbel includes a main body and a support plate, the main body is a hollow structure, and the orthographic projection of the outer contour of the main body is rectangular; The main body extends horizontally outward on both sides to form multiple spaced support plates, and the rear end face of each support plate matches the shape of the outer wall of the protective cylinder.

[0007] Preferably, the top and / or bottom ends of the main body extend horizontally to both sides to form reinforcing portions.

[0008] Preferably, on the top view projection surface of the cow leg, the included angle α between the outer wall of the support plate and the main body is 30-40°.

[0009] Preferably, on the side projection surface of the cow leg, the main body is a right trapezoid that is wider at the top and narrower at the bottom, and the angle β between the lower base of the main body and the sloping waist is 90-120°.

[0010] Preferably, the distance between two adjacent support plates is 20-25cm.

[0011] Preferably, each side of the outer wall of the casing is provided with at least three sets of spaced Bailey beams, and the center-to-center distance between two adjacent sets of Bailey beams is 0.225-0.3m.

[0012] Preferably, the Bailey beam is further provided with multiple wooden beams, and the wooden beams and the bottom formwork distribution beam are alternately arranged, with the spacing between the wooden beams and the bottom formwork distribution beam being 12-25cm.

[0013] Preferably, a film plate is also provided at the bottom of the cast-in-place cap beam.

[0014] Preferably, both the protective sleeve and the bracket are made of steel.

[0015] The large-span wide-gauge cast-in-place modular support system disclosed in this utility model has the following beneficial effects: The main load-bearing structures of the cast-in-place modular support system for the girder, from bottom to top, are: corbel, unloading block, and Bailey beam. The combined structure of "corbel + Bailey beam" can achieve a single-unit load-bearing capacity of up to 150 tons, increasing the load-bearing capacity by 150%, meeting the 120-ton construction load requirement of ultra-wide and ultra-high girder, and can be adapted to a casting volume of up to 120m³. 3 The solution utilizes a super-large cap beam. Furthermore, this solution replaces the traditional, unstable jack-based unloading system with a drop block, achieving precise 3cm drop and avoiding the risk of sudden pressure release due to uncontrolled hydraulic pressure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of a traditional "lightweight clamp simple support". Figure 2 This is a structural schematic diagram of the large-span wide-cap beam cast-in-place modular support of this utility model; Figure 3 This is a structural schematic diagram of the large-span wide-cap beam cast-in-place modular support during construction of this utility model; Figure 4 This is a side view of the modular support structure for cast-in-place large-span wide-cap beams of this utility model. Figure 5 This is a partial structural schematic diagram of the large-span wide-cap beam cast-in-place modular support of this utility model; Figure 6 This is a schematic diagram of the corbel structure in the cast-in-place modular support for large-span wide cap beams of this utility model; Figure 7 This is a front view of the corbel in the cast-in-place modular support for the large-span wide cap beam of this utility model; Figure 8 This is a side view of the corbel in the cast-in-place modular support for the large-span wide cap beam of this utility model; Figure 9 This is a bottom view of the corbel in the cast-in-place modular support for the large-span wide cap beam of this utility model; Figure 10 This is a cross-sectional view of the corbel in the cast-in-place modular support for the large-span wide cap beam of this utility model.

[0018] In the attached diagram: 1-Pile foundation, 11-Casing, 2-Corner, 21-Main body, 211-Lower bottom, 212-Sloping waist, 22-Support plate, 221-Outer wall, 23-Reinforcing part, 3-Unloading block, 4-Bailey beam, 5-Bottom formwork distribution beam, 6-Cast-in-place cap beam, 7-Timber, 8-Film board.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] like Figures 2 to 5 As shown, a large-span wide cap beam cast-in-place modular support includes pile foundations 1, multiple pile foundations 1 are spaced apart, and each pile foundation 1 is fitted with a protective sleeve 11 on its outer wall; The bracket 2 is provided on at least the front and rear sides of the outer wall of each of the sleeves 11; The unloading block 3 can be detachably installed on each of the cow legs 2; Bailey beam 4, and the Bailey beam 4 can be detachably installed on the unloading block 3 on each side; Bottom formwork distribution beam 5, multiple bottom formwork distribution beams 5 are spaced apart on the Bailey beam 4, and the bottom formwork distribution beams 5 are horizontally arranged on the outer wall of the top of the pile foundation 1; The cast-in-place cap beam 6 is installed on the bottom formwork distribution beam 5.

[0024] This scheme for a large-span, wide-gauge cast-in-place modular support system is applicable to bridge construction, particularly suitable for heavy-load bridge construction scenarios involving large-diameter cast-in-place piles (pile foundation 1) with 11mm diameter casings at sea. The main load-bearing structures of the cast-in-place modular support system are arranged from bottom to top as follows: corbel 2 → (mechanical) unloading block 3 → (modular) Bailey beam 4. The load transfer path for the cast-in-place girder 6 is: cast-in-place girder 6 → bottom formwork distribution beam 5 → Bailey beam 4 → unloading block 3 → corbel 2 → casing 11. The most important load-bearing structure is the Bailey beam 4, which is typically assembled from standardized 321-type Bailey panels using pins. The Bailey panels are standard products manufactured by the company, with standard dimensions of length × height = 3m × 1.5m. The Bailey panels are connected as a whole using angle steel support frames. Limiters are welded to the bottom formwork distribution beam 5 (No. 10 I-beam) to ensure connection with the upper chord of the Bailey beam 4. Regarding the placement of various components of the large-span wide-cap beam cast-in-place modular support, for example, the corbel 2 can be placed on both the front and rear sides of the casing 11. In other embodiments, corbel 2 can be added on the left and right sides of the casing 11 as needed. Two unloading blocks 3 are provided on the corbel 2 on the front and rear sides of the casing 11, which can provide more stable support for the Bailey beam 4 above. Bailey beams 4 are respectively provided above the unloading blocks 3 on the front and rear sides of the casing 11, and the Bailey beams 4 on both sides provide good support for the bottom formwork distribution beam 5 above.

[0025] Firstly, the traditional "lightweight clamp" has a single-unit load-bearing capacity limit of 60 tons. The "2 corbels + 4 Bailey beams" combined structure in this design, after third-party testing, has a single-unit load-bearing capacity of up to 150 tons, representing a 150% increase. This fully meets the US standard requirement of 120 tons for ultra-wide and ultra-high cap beams and can accommodate pouring volumes up to 120m³. 3 The ultra-large cap beam (approximately 318 tons) solves the problem that traditional supports cannot support heavy-load cap beam construction. During the construction of the ultra-wide cap beam of the Saudi connecting bridge, this support system was used in a 1.2 times design load pre-stressing test. Within 24 hours, the maximum settlement of the support was only 5mm, far below the allowable settlement limit specified in the code, and there was no structural deformation or stress exceeding the standard, proving its excellent load-bearing stability. Secondly, this solution uses (mechanical) unloading blocks 3 to replace the traditional unstable jack unloading system, such as the existing type A or type B unloading blocks 3. Through a mechanical structure of fixed precision-rolled threaded steel and manual height adjustment, it achieves a precise 3cm unloading, avoiding the risk of sudden pressure relief caused by hydraulic runaway.

[0026] The assembly steps of the large-span wide-cap beam cast-in-place modular support system in this scheme during actual construction are as follows: First, a protective casing 11 is arranged on the pile foundation 1. Then, a corbel 2 is welded onto the steel protective casing 11. Next, a (mechanical) unloading block 3 is arranged on the corbel 2. After adjusting the elevation, a Bailey beam 4 is arranged according to the required cap beam length. After the Bailey beam 4 is assembled, a bottom formwork distribution beam 5 is laid on top of it. Finally, the bottom formwork of the cap beam is laid on the bottom formwork distribution beam 5, and concrete is poured to form the cast-in-place cap beam 6. After the support system is erected, a pre-stressing test is conducted to determine the safety of the support system. After the cap beam concrete is poured and cured to the required age, the support system is dismantled. First, the fixing screws of the precision-rolled threaded steel on both sides of the (mechanical) unloading block 3 are loosened to reduce the height of the unloading block 3 by 3cm. Then, the distribution beam → Bailey beam 4 → corbel 2 → anti-corrosion coating of the protective casing 11 are removed in sequence. This completes the entire cycle of installation, use, and dismantling of the modular support system.

[0027] In summary, the modular support system for cast-in-place large-span wide cap beams proposed in this scheme features high load-bearing capacity, high safety factor, adaptability to construction of cap beams of different lengths, and modular rapid assembly and disassembly.

[0028] In addition, in other embodiments, a hydraulic synchronous unloading frame with a pressure monitoring system can be used to replace the (mechanical) unloading block 3, which can realize automated synchronous unloading with an unloading accuracy of 0.5mm.

[0029] In the production process of Bailey beam 4, a special prefabricated mold can be designed to meet the standardized production needs of the 321 type Bailey panels. This mold adopts an integral steel structure with built-in positioning pins and welding guide devices, which can achieve precise positioning of the chords and web members of the Bailey panels with an error of ≤0.5mm. The production efficiency is 40% higher than that of traditional molds. At the same time, the mold is equipped with detachable side molds, which can adjust the length of the Bailey panels according to the needs, and adapt to three specifications of 2.5m, 3m and 3.5m. This provides a guarantee for the mass and customized production of Bailey panels and solves the problems of low production precision and single specification of existing Bailey panels.

[0030] For construction of railway bridges, which must meet railway clearance requirements and whose construction time is limited by train operation, the existing large-span wide-cap beam cast-in-place modular support can be further optimized: the Bailey beam 4 can be modified to a lightweight design, specifically using aluminum alloy Bailey panels, reducing weight by 30%, and combined with detachable brackets 2, which are connected to the casing 11 by bolts, eliminating the need for on-site welding, enabling rapid installation of the support at night, completing the installation of a single span within 6 hours, and avoiding disruption to normal daytime railway operations; at the same time, protective nets and noise reduction plates can be added to the outside of the support to reduce construction interference with railway operations, expanding the application of this solution in the field of railway bridges.

[0031] Furthermore, the corbel 2 includes a main body 21 and a support plate 22. The main body 21 has a hollow structure, and the orthographic projection of the outer contour of the main body 21 is rectangular. The two sides of the main body 21 extend horizontally outward to form a plurality of spaced support plates 22, and the rear end face of each support plate 22 is matched with the shape of the outer wall of the protective cylinder 11.

[0032] Specifically, such as Figures 6 to 10 As shown, the main body 21 and the support plate 22 are integrally welded into an integral corbel 2 structure using 20mm steel plates in the processing plant. This effectively solves the problems that traditional pre-embedded shear key type corbel 2 cannot be used in the "heavy-load bridge construction scenario of large-diameter steel casing 11 cast-in-place piles at sea", and that the bearing capacity of traditional lightweight clamps is insufficient to meet the heavy-load construction load. The unloading block 3 can be set across the corbel 2. The composite structure of the main body 21 and the support plate 22 can fully consider the welding operation space, which is convenient for on-site welding construction with the casing 11. The two sides of the main body 21 extend horizontally outward to form multiple spaced support plates 22. The support plates 22 are approximately "triangular". The rear end face of the support plate 22 and the rear end face of the main body 21 can be welded to the outer wall of the casing 11. In terms of stress performance, this structure can stably transfer and distribute the load, and has the advantages of strong bearing capacity, good applicability, convenient processing, flexible installation, and reliable and durable structure. In addition, after the removal of the bracket 2 structure, the welded joints of the bracket 2 can be recut, ground, and inspected, thus realizing secondary utilization and greatly improving resource utilization.

[0033] Furthermore, the top and / or bottom ends of the main body 21 extend horizontally to both sides to form reinforcing parts 23. The horizontal extension of the top and bottom ends of the main body 21 to form reinforcing parts 23 can, on the one hand, significantly increase the load-bearing cross-sectional area of ​​the corbel 2, effectively dispersing local stress concentration; on the other hand, the reinforcing part 23 at the top of the main body 21 mainly resists negative bending moments, while the reinforcing part 23 at the bottom of the main body 21 resists positive bending moments, forming a composite bending-resistant system with coordinated upper and lower reinforcement. This symmetrically distributed reinforcing part 23 structure allows the corbel 2 to exhibit a more uniform stress distribution when subjected to multi-directional loads, further improving its load-bearing capacity. It is particularly suitable for key node parts of large-span wide-cap beam cast-in-place modular supports.

[0034] Furthermore, on the top-view projection plane of the corbel 2, the angle α between the outer wall 221 of the support plate 22 and the main body 21 is 30-40°. The angle α between the outer wall 221 of the approximately "triangular" support plate 22 and the vertical side of the main body 21 is 30-40°. This angle setting allows the support plate 22 to effectively transfer shear force, improving shear bearing capacity, and also avoids local buckling caused by an excessively small angle. The support plates 22 on both sides of the main body 21 are typically arranged symmetrically to significantly enhance the resistance to lateral deformation through the truss effect formed by the support plates 22, increasing lateral stiffness by 40%-60%. The aforementioned approximately "triangular" support plate 22, as an extension and reinforcement of the main body 21, together with the hollow main body 21, forms a composite force-bearing system, exhibiting excellent fatigue performance under dynamic load conditions such as vehicles and bridges, and is particularly suitable for engineering scenarios requiring both lightweight and high load-bearing capacity.

[0035] Furthermore, on the side projection plane of the corbel 2, the main body 21 is a right-angled trapezoid with a wider top and a narrower bottom, and the angle β between the lower base 211 and the inclined waist 212 of the main body 21 is 90-120°. The right-angled trapezoidal shape of the main body 21, with its wider upper end, enhances compressive stability, while the narrower lower end reduces weight and optimizes stress transmission. The angle β between the lower base 211 and the inclined waist 212 is set to 90-120°. This range of inclined angles avoids stress concentration caused by excessively small angles and achieves efficient moment transmission through a progressive section transition. The right-angled side of the main body 21 provides a vertical bearing reference plane, and the inclined waist 212 of the main body 21 forms a natural reinforcing rib, together constructing a bending-shear composite system. This allows the load of the corbel 2 to be evenly distributed along the inclined waist 212 to the entire support structure, increasing the bearing capacity by more than 60% compared to a traditional corbel 2.

[0036] Furthermore, the spacing between two adjacent support plates 22 is 20-25cm. The horizontal support plates 22 on both sides of the main body 21 form a continuous transverse stiffening rib structure, effectively suppressing local buckling of the main body 21, improving the stability of the corbel 2, and expanding the stress-bearing area; the spacing between the support plates 22 on both sides is set to 20-25cm, which can precisely match the material yield strength and shear force transmission requirements, so that a high-density reinforcing grid is formed between the support plates 22. If the spacing is too large, it will reduce the support effect; if it is too small, it will increase the weight of the corbel 2.

[0037] Furthermore, each side of the outer wall of the casing 11 is provided with at least three sets of spaced Bailey beams 4, and the center distance between two adjacent sets of Bailey beams 4 is 0.225-0.3m.

[0038] In actual assembly, such as Figure 4As shown, the number of Bailey bridge sections in Bailey beam 4 can be flexibly increased or decreased according to the length of the cast-in-place cap beam 6, increasing the adaptability by 154%. It can be adapted to the construction of ultra-wide cap beams with spans of 10-30m, breaking through the limitation of ordinary steel sections with a single length of 12m, which can only be adapted to cap beams ≤11m. Moreover, the Bailey bridge 4 in this solution does not require separate support design for different cap beams, reducing construction costs.

[0039] Arranging at least three sets of Bailey beams 4 on each side of the pile foundation 1 / casing 11, with the center-to-center spacing of each set of Bailey beams 4 being approximately 0.225-0.3 m, can significantly improve the lateral stiffness, meet the lateral load transfer requirements of the ultra-wide cap beam, and solve the pain point of insufficient lateral stability of traditional steel sections.

[0040] In other embodiments, type 450 Bailey panels can be used instead of type 321 Bailey panels, which have a 30% higher load-bearing capacity than type 321 Bailey panels, further increasing the overall load-bearing capacity of the support structure and making it suitable for cast-in-place cap beams 6 with extremely heavy loads (e.g., >180 tons).

[0041] Furthermore, the Bailey beam 4 is also provided with multiple timber beams 7, which are alternately arranged with the bottom formwork distribution beam 5, and the spacing between the timber beams 7 and the bottom formwork distribution beam 5 is 12~25cm. Figure 5 As shown, after the Bailey bridge panels are installed, the bottom formwork distribution beam 5 (usually a 10-beam) and 100×100 timber 7 are installed. The bottom formwork distribution beam 5 and timber 7 are arranged alternately, with a spacing of about 12~25cm (preferably 12.5cm). The timber 7 is fixed to the Bailey bridge panels with wire to ensure a tight connection. The support system of the cast-in-place cap beam 6 adopts the design of alternating arrangement of "I-beam bottom formwork distribution beam 5 + timber 7", which has the advantages of both rigidity and elasticity. The I-beam, as the bottom formwork distribution beam 5, can exert high bending resistance and bear the main vertical load, ensuring the overall stability of the system; the timber 7 can provide elastic compensation, absorb construction impact loads, and prevent brittle cracking during concrete pouring. The two work together to transform the concentrated load of the Bailey bridge beam 4 into a uniformly distributed load, which is particularly suitable for heavy-duty formwork support systems for large-span cast-in-place concrete structures.

[0042] Furthermore, a film plate 8 is also provided at the bottom of the cast-in-place cap beam 6. For example... Figure 4 As shown, the bottom formwork of the cap beam is covered with 18mm thick film board 8. Film board 8 is a building formwork with a phenolic resin impregnated paper surface. Film board 8 has both high strength and a smooth and dense surface. It is directly used as the forming formwork under the cast-in-place cap beam 6 to ensure the flatness of the bottom surface of the cap beam and eliminate the need for secondary plastering.

[0043] Furthermore, both the casing 11 and the bracket 2 are made of steel. In this design, the casing 11 is a permanent steel casing 11, and the main body 21 of the bracket 2 is welded from a 70cm×70cm×2cm steel plate, while the side support plates 22 are made of a 41.6cm×20cm×2cm steel plate. The overall structure has high strength and a long service life.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A modular support system for cast-in-place large-span wide-cap beams, characterized in that, include: The pile foundation (1) is distributed at intervals, and each pile foundation (1) is fitted with a protective casing (11) on its outer wall. The cow leg (2) is provided on at least the front and rear sides of the outer wall of each of the sleeves (11); The unloading block (3) can be detachably provided on each of the cow legs (2); Bailey beam (4), and the Bailey beam (4) can be detachably installed on the unloading block (3) on each side; Bottom formwork distribution beam (5), multiple bottom formwork distribution beams (5) are spaced apart on the Bailey beam (4), and the bottom formwork distribution beams (5) are horizontally arranged on the outer wall of the top of the pile foundation (1); The cast-in-place cap beam (6) is set on the bottom formwork distribution beam (5).

2. The large-span wide-cap beam cast-in-place modular support according to claim 1, characterized in that, The cow leg (2) includes a main body (21) and a support plate (22). The main body (21) is a hollow structure, and the orthographic projection of the outer contour of the main body (21) is rectangular. The two sides of the main body (21) extend horizontally outward to form a plurality of spaced support plates (22), and the rear end face of each support plate (22) matches the shape of the outer wall of the protective sleeve (11).

3. The large-span wide-cap beam cast-in-place modular support according to claim 2, characterized in that, The top and / or bottom of the main body (21) extend horizontally to both sides to form a reinforcing part (23).

4. The large-span wide-cap beam cast-in-place modular support according to claim 2, characterized in that, On the top view projection plane of the cow leg (2), the included angle α between the outer side wall (221) of the support plate (22) and the main body (21) is 30-40°.

5. A large-span wide-cap beam cast-in-place modular support according to claim 2 or 4, characterized in that, On the side projection plane of the cow leg (2), the main body (21) is a right trapezoid that is wider at the top and narrower at the bottom, and the angle β between the bottom (211) and the sloping waist (212) of the main body (21) is 90-120°.

6. The large-span wide-cap beam cast-in-place modular support according to claim 2, characterized in that, The distance between two adjacent support plates (22) is 20-25cm.

7. The large-span wide-cap beam cast-in-place modular support according to claim 1, characterized in that, Each side of the outer wall of the casing (11) is provided with at least three sets of spaced Bailey beams (4), and the center distance between two adjacent sets of Bailey beams (4) is 0.225~0.3m.

8. The large-span wide-cap beam cast-in-place modular support according to claim 1, characterized in that, The Bailey beam (4) is also provided with multiple wooden beams (7), and the wooden beams (7) and the bottom formwork distribution beam (5) are alternately arranged, and the distance between the wooden beams (7) and the bottom formwork distribution beam (5) is 12~25cm.

9. A modular support for cast-in-place large-span wide cap beams according to claim 1, characterized in that, The bottom of the cast-in-place cap beam (6) is also provided with a film plate (8).

10. A large-span wide-cap beam cast-in-place modular support according to claim 1, characterized in that, Both the sleeve (11) and the cow leg (2) are made of steel.

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