Beam plate type cover plate for reserved hole of foundation pit trestle

Abstract

The utility model discloses a beam plate type cover plate for a reserved hole of a foundation pit trestle, which relates to the field of constructional engineering, and adopts the technical scheme that a rectangular step opening is reserved on a trestle plate, and a cover plate is detachably arranged in the rectangular step opening; the cover plate is characterized in that the cover plate comprises a rectangular frame type support beam, the projection of the support beam on the horizontal plane corresponds to the rectangular step opening, the inner wall of the support beam is fixedly connected through a plurality of midspan beams which are arranged in a crossed mode, and the projection of the midspan beams on the horizontal plane is in a grid shape; a rectangular panel is fixedly arranged on the upper surface of the support beam and the upper surface of the midspan beam, the four corners of the panel are each provided with a rectangular hole, and a lifting lug is movably arranged in each hole. The trestle plate has the advantages that the rectangular step opening is reserved in the trestle plate, the cover plate can be supported, the trestle plate can be connected with the cast-in-place concrete trestle plate into a whole, and the bearing capacity is high. The reserved hole cannot obviously weaken the overall stress performance of the trestle, and therefore the reserved hole can be set to be large in size.

Description

Technical Field

[0001] The utility model relates to the field of construction engineering, in particular to a beam-slab cover plate for a reserved opening of a foundation pit trestle. Background Art

[0002] With the rapid development of the national economy and the continuous improvement of construction technology, the shape of steel structure buildings has become more and more complex, and the use of large steel components has become more and more extensive. At the same time, the shortage of urban land resources requires buildings to make extensive use of underground space. Therefore, during the construction phase of the basement of steel structure buildings, there are more and more cases of hoisting large steel components into the foundation pit. The concrete internal support system is a commonly used foundation pit retaining system. The first support of the internal support system will set up a trestle as a temporary road and machinery and material yard. However, the hoisting and installation of large steel components directly under the trestle are extremely difficult.

[0003] The traditional construction method is to cast the entire trestle as a whole. When large steel components need to be hoisted, holes are drilled on the trestle boards at the corresponding positions to facilitate the hoisting of the components downwards. This method is both time-consuming and labor-intensive, and it destroys the force-bearing system of the first support, affecting the use function of the trestle.

[0004] The prior art (patent announcement number CN 217629427 U) adopts a construction method of reserving a hole for a foundation pit trestle and setting a removable cover. When the component is hoisted, the cover is opened to expose the hole. After the component is hoisted, the cover is closed to restore the function of the trestle. This method can avoid the disadvantages of the traditional method of drilling holes in the trestle board. However, the cover in the prior art adopts a rectangular plate body, and two reinforcing ribs are set on the lower side of the rectangular plate body. The stress form of this cover structure is a bidirectional simply supported plate stress form, and the bending moment in the mid-span area is the largest. The mid-span section of the cover is a T-shaped section, and the bending bearing capacity of the T-shaped section is low. Therefore, this cover is used as a temporary road or machinery and material yard, and the bearing capacity is relatively low. In addition, after the concrete trestle board reserves the hole, only reinforcing ribs are added to the side wall of the reserved hole, which does not solve the problem of reduced bearing capacity caused by the overall stress performance of the trestle board being affected. In summary, the existing technology is generally only applicable to reserved openings with small areas and small loads on the upper cover plate, and is not applicable to reserved openings with large areas or large loads on the upper cover plate. For large steel components, hoisting requires a larger opening, such as a rectangular cross-section steel column with a side length of 2m and its attached corbels. The side length of the hoisting opening needs to be more than 3m, and the existing technology is difficult to apply to such situations. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a beam-slab cover plate for a reserved opening of a foundation pit trestle.

[0006] The technical solution is that a rectangular stepped opening is reserved on the trestle board, and a cover plate is detachably arranged in the rectangular stepped opening; characterized in that, the cover plate includes a support beam in the form of a rectangular frame, the projection of the support beam on the horizontal plane corresponds to the rectangular stepped opening, the inner wall of the support beam is fixedly connected by a plurality of cross - arranged mid - span beams, and the projections of the plurality of mid - span beams on the horizontal plane are in a grid shape;

[0007] A rectangular panel is fixedly arranged on the upper surfaces of the support beam and the mid - span beams, rectangular openings are respectively opened at the four corners of the panel, and a lifting lug is movably arranged in each opening.

[0008] Preferably, the mid - span beam is a variable cross - section steel beam, the cross - section heights at both ends of the mid - span beam correspond to the cross - section height of the support beam, and the cross - section height in the middle of the mid - span beam is greater than the cross - section heights at both ends of the mid - span beam.

[0009] Preferably, the lifting lug includes a rectangular lifting plate, a through lifting hole is opened in the middle of the lifting plate, a bottom plate is fixedly arranged at the lower end of the lifting plate, and the width of the bottom plate is greater than the width of the lifting plate;

[0010] A limiting plate is fixedly arranged at the upper end of the lifting plate.

[0011] Preferably, a number of rectangular hollow areas are formed by the projections of the plurality of mid - span beams and the support beam on the horizontal plane;

[0012] A number of cross - shaped reinforcing ribs are fixedly arranged on the lower surface of the panel, each group of reinforcing ribs corresponds to one of the hollow areas, and the four corners of the reinforcing ribs are respectively fixedly connected to the mid - span beam or the support beam.

[0013] Preferably, the cross - section shapes of the support beam and the mid - span beam are both in the shape of "丄", the support beam and the mid - span beam both include a beam web and a lower flange, and the upper end of the beam web is fixedly connected to the panel.

[0014] The beneficial effects brought by the technical solution provided by the embodiment of the present utility model are as follows: 1. A rectangular stepped opening is reserved on the trestle board, which can not only support the cover plate but also be integrated with the cast - in - place concrete trestle board, with high bearing capacity. The reserved opening will not significantly weaken the overall mechanical performance of the trestle. Therefore, a relatively large size can be set for the reserved opening to meet the hoisting requirements of large - scale steel components.

[0015] 2. The form of the cover plate is beam - slab type and is provided with cross stiffeners, with high bearing capacity, and can achieve the same bearing capacity as the cast - in - place concrete trestle board, ensuring that the reserved opening does not affect the use function and bearing capacity of the trestle.

[0016] 3. The mid - span beam adopts a variable cross - section beam, with reasonable stress, high bearing capacity, and saving the material consumption of the cover plate.

[0017] 4. The panel also serves as the flange on the beam, which can not only ensure the use function, but also play the load-bearing function. The force is reasonable and the amount of cover material can be saved.

[0018] 5. The lifting lug with a limiting plate can be hung in the hole and cover the hole when not lifting; it can be taken out easily and conveniently when lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0020] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the utility model.

[0021] Figure 3 It is an exploded schematic diagram of the overall structure of an embodiment of the utility model.

[0022] Figure 4 This is a schematic diagram of the support beam and mid-span beam structure of an embodiment of the utility model.

[0023] Figure 5 This is a schematic diagram of the panel structure of an embodiment of the utility model.

[0024] Figure 6 This is a schematic diagram of the lifting ear structure of an embodiment of the utility model.

[0025] Among them, the figure markings are: 1. trestle board; 2. rectangular step opening; 3. cover plate; 4. support beam; 5. mid-span beam; 6. panel; 7. lifting ear; 8. hanging plate; 9. lifting hole; 10. bottom plate; 11. limit plate; 12. reinforcing rib. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the invention of the present utility model, 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 invention of the utility model 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 a limitation on the invention of the utility model. In addition, the terms "first", "second", etc. 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. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention of the utility model can be understood according to specific circumstances.

[0030] Example 1

[0031] See also Figures 1 to 6 The utility model provides a beam-plate cover plate for a reserved opening of a foundation pit trestle, comprising a trestle plate 1, a rectangular step opening 2 is reserved on the trestle plate 1, and a cover plate 3 is detachably arranged in the rectangular step opening 2; the cover plate 3 comprises a rectangular frame-type support beam 4, the projection of the support beam 4 on the horizontal plane corresponds to the rectangular step opening 2, the inner wall of the support beam 4 is fixedly connected by a plurality of cross-arranged mid-span beams 5, and the projection of the plurality of mid-span beams 5 on the horizontal plane is in a grid shape;

[0032] A rectangular panel 6 is fixedly arranged on the upper surface of the support beam 4 and the mid-span beam 5. A rectangular opening is respectively opened at the four corners of the panel 6, and a lifting lug 7 is movably arranged in each opening.

[0033] The mid-span beam 5 is a variable-section steel beam. The cross-sectional heights at both ends of the mid-span beam 5 correspond to the cross-sectional heights of the support beam 4 , and the cross-sectional height in the middle of the mid-span beam 5 is greater than the cross-sectional heights at both ends of the mid-span beam 5 .

[0034] The height of the middle section of the mid-span beam 5 is determined by the magnitude of the force. The greater the force, the higher the section height. When the force is relatively small, a common beam rather than a variable-section beam can also be used. The mid-span beam 5 is arranged bidirectionally, and the number in each direction can be determined according to the bearing capacity requirements. In the schematic diagram of this solution, two mid-span beams 5 are used in each direction.

[0035] The lifting lug 7 includes a rectangular lifting plate 8. A through lifting hole 9 is provided in the middle of the lifting plate 8. A bottom plate 10 is fixedly arranged at the lower end of the lifting plate 8, and the width of the bottom plate 10 is greater than the width of the lifting plate 8.

[0036] A limiting plate 11 is fixedly arranged at the upper end of the lifting plate 8. The width of the limiting plate 11 corresponds to the width of the lifting plate 8, and the length of the limiting plate 11 is greater than the length of the lifting plate 8.

[0037] When lifting, the lifting plate 8 is lifted upward, and the lifting plate 8 passes through the hole, exposing the lifting hole 9, which can be connected to the hook; the bottom plate 10 cannot pass through the hole and can bear the force to lift the cover plate 3.

[0038] The size of the limiting plate 11 is larger than the lifting lug hole. When the lifting lug 7 is not in use, it is hung in the hole through the limiting plate 11, and the limiting plate 11 can cover the hole without affecting the use of the cover plate 3.

[0039] Several rectangular void areas are formed by the projections of multiple mid-span beams 5 and support beams 4 on the horizontal plane;

[0040] Several groups of cross-shaped stiffening ribs 12 are fixedly arranged on the lower surface of the panel 6. Each group of stiffening ribs 12 corresponds to a void area respectively, and the four corners of the stiffening ribs 12 are fixedly connected to the mid-span beam 5 or the support beam 4 respectively.

[0041] The panel 6 bears loads such as vehicles and stacked objects, and then transfers the force to the mid-span beam 5. The mid-span beam 5 transfers the force to the support beam 4, and the support beam 4 transfers the force to the cast-in-place concrete trestle board 1, forming a complete force transmission system.

[0042] The local stiffness of the panel 6 is small. To ensure the local stiffness of the panel 6 and the overall mechanical properties of the cover plate 3, cross-shaped stiffening ribs 12 are arranged on the lower side of the panel 6.

[0043] The cross-sectional shapes of the support beam 4 and the mid-span beam 5 are both "丄"-shaped. The support beam 4 and the mid-span beam 5 both include a beam web and a lower flange, and the upper end of the beam web is fixedly connected to the panel 6.

[0044] When the utility model is in use, the cover plate 3 is placed in the rectangular stepped opening 2 on the trestle board 1. Loads such as vehicles or stacked objects can be placed on the cover plate 3. When component hoisting is required, the cover plate 3 is moved away using a hoisting device;

[0045] When lifting, the hanging plate 8 is moved up, and the hanging plate 8 passes through the hole, exposing the hanging hole 9, which can be connected with a hook; the bottom plate 10 cannot pass through the hole, and the cover plate 3 can be lifted by force.

[0046] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A beam-slab cover plate for a reserved opening of a foundation pit trestle, comprising a trestle plate (1), a rectangular step opening (2) being reserved on the trestle plate (1), and a cover plate (3) being detachably arranged in the rectangular step opening (2); characterized in that: The cover plate (3) includes a support beam (4) in the form of a rectangular frame. The projection of the support beam (4) on the horizontal plane corresponds to the rectangular stepped opening (2). The inner walls of the support beam (4) are fixedly connected by a number of cross - arranged mid - span beams (5). The projections of the multiple mid - span beams (5) on the horizontal plane are in a grid shape; On the upper surfaces of the support beam (4) and the mid - span beams (5), a rectangular panel (6) is fixedly arranged. Rectangular openings are respectively formed at the four corners of the panel (6). A lifting lug (7) is movably arranged in each opening.

2. The beam-slab cover plate for the reserved opening of the foundation pit trestle according to claim 1 is characterized in that: The mid - span beam (5) is a steel beam with a variable cross - section. The cross - section heights at both ends of the mid - span beam (5) correspond to the cross - section height of the support beam (4). The cross - section height in the middle of the mid - span beam (5) is greater than the cross - section heights at both ends of the mid - span beam (5).

3. The beam-slab cover plate for the reserved opening of the foundation pit trestle according to claim 1 is characterized in that: The lifting lug (7) includes a rectangular lifting plate (8). A through - hole (9) is formed in the middle of the lifting plate (8). A bottom plate (10) is fixedly arranged at the lower end of the lifting plate (8). The width of the bottom plate (10) is greater than the width of the lifting plate (8); A limiting plate (11) is fixedly arranged at the upper end of the lifting plate (8).

4. The beam-slab cover plate for the reserved opening of the foundation pit trestle according to claim 2 is characterized in that: A number of rectangular void areas are formed by the projections of the multiple mid - span beams (5) and the support beam (4) on the horizontal plane; On the lower surface of the panel (6), a number of cross - shaped reinforcing ribs (12) are fixedly arranged. Each group of the reinforcing ribs (12) corresponds to one of the void areas. The four corners of the reinforcing ribs (12) are respectively fixedly connected to the mid - span beam (5) or the support beam (4).

5. The beam-slab cover plate for the reserved opening of the foundation pit trestle according to claim 2 is characterized in that: The cross - section shapes of the support beam (4) and the mid - span beam (5) are both in the shape of "丄". The support beam (4) and the mid - span beam (5) both include a beam web and a lower flange. The upper end of the beam web is fixedly connected to the panel (6).

Images