Early-dismantling type multi-ribbed floor system mold box and floor system mold supporting structure

Abstract

The utility model relates to an early dismantling type dense rib floor system mould box and a floor system mould supporting structure, the mould box comprises a top surface, the periphery of the top surface is connected with a peripheral side surface extending downwards, and a cavity is formed inside the peripheral side surface enclosed by the top surface; the lower edge of the peripheral side surface continuously and horizontally extends outwards to form a turnup, and the outer contour of a circle of turnup is square; the end face of the free end of the flanging outer edge forms an action connecting face where the die boxes abut against one another, and a horizontal connecting hole used for abutting against the die boxes to form connection is formed in the action connecting face in a penetrating mode. Early-dismantling notches are vertically formed in the four corners of the circle of turned-over edge in a penetrating mode correspondingly; when the number of the mold boxes is four and the mold boxes are connected with one another, the corner positions in the middle of the mold boxes jointly define a regular combined notch through the four early-dismantling notches; in cooperation with a supporting jack and a supporting block which are designed and used in cooperation with the mold box, a built floor system mold supporting structure can dismantle the mold box in advance and recycle the mold box after concrete slurry is poured and finally set, the efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of fixed building foundation engineering components, and particularly relates to an early demolition ribbed floor formwork box and a floor formwork support structure. Background Art

[0002] In the existing ribbed floor formwork support system, the floor formwork is supported by a full-span scaffold, and then the formwork box is placed and supported on the floor formwork. The entire support process and subsequent demolition efficiency are very low, and the connection and positioning effect between the formwork boxes is also relatively poor.

[0003] In view of the above situation, the applicant designed and used a formwork box and its connection structure that are convenient for installation and demolition, as disclosed in Chinese Patent CN221095844U. The formwork box includes a horizontal formwork box top surface, and a surrounding side surface extending downward is connected to the periphery of the formwork box top surface. A cavity is formed inside the formwork box top surface and the surrounding side surface enclosing it. The lower edge of the surrounding side surface continues to extend horizontally outward to form a flanging, and the outer contour of the flanging is square; the free end surface of the outer edge of the flanging forms a connection surface for the formwork boxes to abut against each other, and vertical connection holes for connecting with a jack are respectively penetrated through the four corners of the flanging; a horizontal connection hole for connecting between the mutually abutting formwork boxes is penetrated through the flanging. During use, the formwork boxes directly abut against each other through the connection surface of the outer edge of the flanging, and fasteners are passed through the horizontal connection holes for connection. There is no need to lay the floor formwork, reducing consumables. The corner positions between four adjacent formwork boxes are supported by a jack. Four vertical through holes arranged in a rectangle are penetrated through the jack, and the four vertical connection holes at the corner positions in the middle of the four formwork boxes and the four vertical through holes on the jack are connected one by one through fasteners in a detachable manner. This support system is convenient to build, has high construction efficiency, and can effectively guarantee the installation accuracy.

[0004] However, in the above-mentioned ribbed floor formwork support system, after the concrete slurry is poured on the built formwork boxes, it takes about 4 - 7 days for the concrete slurry to undergo initial setting and final setting, reaching about 50% - 70% of the design strength, and further curing is required; it takes about 30 days in total for the reinforced concrete floor to reach the design strength before the entire support system can be demolished as a whole. The turnover and utilization efficiency of the components in the entire support system is low, and the construction cost is high and the cycle is long. The applicant considered designing an early demolition ribbed floor formwork box (or support system). According to the construction standard requirements, under the premise of maintaining point support with unit density throughout the curing cycle, after the concrete slurry undergoes final setting for about 4 - 7 days and reaches the basic strength, the formwork box can be removed first and recycled, and the jack can always maintain support until the curing is completed according to the construction standard requirements. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the technical problem to be solved by the present utility model is to provide an early-demolition ribbed floor formwork box and a floor formwork support structure, so as to avoid the problem of low turnover and utilization efficiency of the formwork box in the current ribbed floor formwork support system, and achieve the effects of improving the turnover and utilization efficiency and simplifying the cost.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] An early-demolition ribbed floor formwork box includes a horizontal formwork top surface. A peripheral side surface extending downward is connected to the periphery of the formwork top surface. A cavity is formed inside the formwork top surface and the enclosing peripheral side surface. The lower edge of the peripheral side surface continues to horizontally extend outward to form a flanging, and the outer contour of the flanging in a circle is square; the free end face of the outer edge of the flanging forms a working connection surface for the formwork boxes to abut against each other. Horizontally connecting holes for forming a connection between the mutually abutting formwork boxes are penetrated through the working connection surface.

[0008] Early-demolition notches are vertically penetrated through the four corner positions of the flanging in a circle to present a corner-cut design.

[0009] When the number of formwork boxes is four and they are connected to each other, the lower surfaces of the four formwork boxes are coplanar and arranged in a matrix. The formwork boxes abut against each other through the corresponding working connection surfaces. The corner positions in the middle of the four formwork boxes jointly enclose a regular combined notch through the corresponding early-demolition notches of each formwork box.

[0010] To further improve the above technical solution, on one formwork box, the four early-demolition notches are symmetrically arranged in pairs in two length directions of the outer contour of the flanging in a circle.

[0011] Furthermore, the horizontal cross-section of the combined notch is square, rectangular or circular.

[0012] The present utility model also relates to a floor formwork support structure, which includes a plurality of the above-mentioned early-demolition ribbed floor formwork boxes. The lower surfaces of the plurality of formwork boxes are coplanar and horizontally laid longitudinally and transversely. The longitudinally and transversely adjacent formwork boxes abut against each other through the corresponding working connection surfaces. Fasteners pass through the horizontal connection holes on the two mutually abutting working connection surfaces at the same time to keep the two formwork boxes abutting and connected.

[0013] A support block corresponding to the shape of the combined notch is vertically slidably placed in the combined notch at the corner position in the middle of the four formwork boxes arranged in a matrix; a support jack is jointly supported at the corner position in the middle of the four formwork boxes and below the support block.

[0014] Further, the supporting and jacking device includes a vertical support rod and a formwork box support member. An installation hole is vertically penetrated through the formwork box support member, and the formwork box support member is vertically slidably sleeved on the vertical support rod through the installation hole. The upper surface of the formwork box support member forms a horizontal formwork box support surface, and the upper end surface of the vertical support rod forms a horizontal central support surface. An elevating positioning member for sliding and limiting the formwork box support member on the vertical support rod is connected to the vertical support rod.

[0015] The formwork box support member slides up on the vertical support rod until the formwork box support surface is flush with the central support surface, and the elevating positioning member is located below the formwork box support member to restrict the downward movement of the formwork box support member.

[0016] The formwork box support surface abuts against the lower surfaces at the middle corners of the four formwork boxes, and the central support surface only abuts against the lower surface of the support block and does not contact the lower surfaces at the middle corners of the four formwork boxes.

[0017] Further, the area of the lower surface of the support block is not less than the area of the central support surface, and the central support surface abuts within the outer contour of the lower surface of the support block.

[0018] Further, the area of the lower surface of the support block is larger than the area of the central support surface; the inner edge of the formwork box support surface also abuts against the lower surface of the support block outside the abutting position with the central support surface.

[0019] Further, a horizontal top plate is fixedly connected to the upper end of the vertical support rod. The area of the upper surface of the top plate is larger than the area of the upper end surface of the vertical support rod, and the upper surface of the top plate forms the central support surface.

[0020] The inner diameter of the installation hole corresponds to the outer diameter of the vertical support rod. A sunk platform is recessed on the upper surface of the formwork box support member, and the circumferential contour and depth of the sunk platform correspond to the outer contour and thickness of the top plate.

[0021] Further, the formwork box support member includes a vertical sleeve. A horizontal formwork box support plate is fixedly connected to the top end of the sleeve. The inner hole of the sleeve vertically penetrates through the formwork box support plate and forms the installation hole. The upper surface of the formwork box support plate forms the formwork box support surface, and the sunk platform is recessed on the upper surface of the formwork box support plate.

[0022] Further, a plurality of circumferentially spaced support and reinforcing rib plates are connected between the outer circumferential surface of the sleeve and the lower surface of the formwork box support plate.

[0023] The formwork support member is formed by detachably connecting two split structures obtained by axially dividing a vertical strut; on the outer side of the sleeve, there are two symmetrical support and strengthening rib plates on the left and right, parallel to the fastening surfaces of the two split structures, and there is also a support and strengthening rib plate perpendicular to the fastening surfaces; on the two split structures, the support and strengthening rib plates parallel to the fastening surfaces are pairwise parallel and facing each other, and through holes for forming a connection between the two split structures that are fastened to each other are penetrated and opened on the two support and strengthening rib plates facing each other in parallel.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. For the floor slab formwork support structure of the utility model, a supporting formwork, a supporting jack, and a supporting block that are used in a supporting manner are specially designed. After the floor slab formwork support structure is built, concrete slurry is poured on the floor slab formwork. After the concrete slurry undergoes final setting for 4 - 7 days and reaches the basic strength, the restriction of the formwork support member on the formwork is released, and the formwork can be removed in advance without waiting until the entire curing period of about 30 days ends and then being removed as a whole. The formwork is removed first and recycled, which can improve the recycling efficiency and reduce the construction cost.

[0026] 2. For the floor slab formwork support structure of the utility model, after the formwork is removed first, the vertical strut still maintains the support for the floor slab, and during the entire curing period, the support effect required by the building construction standard is also satisfied.

[0027] 3. For the floor slab formwork support structure of the utility model, the formwork support member can be disengaged from the vertical strut along the radial direction (quickly) of the vertical strut, which further facilitates the removal of the formwork and improves the construction efficiency.

[0028] 4. For the floor slab formwork support structure of the utility model, when hoisting the assembled formwork onto the supporting jack, as long as the central support surface can be sleeved into the combined notch, it is equivalent to a large hole sleeving a small support surface. The hoisting and installation accuracy requirements are reduced, and the tolerance rate becomes higher, which is convenient for operation. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of an early - demolition multi - ribbed floor slab formwork in the floor slab formwork support structure of the embodiment;

[0030] Figure 2 For Figure 1 the top - view of the matrix arrangement when the number of formworks is four;

[0031] Figure 3 It is a schematic structural diagram of the supporting jack in the floor slab formwork support structure of the embodiment;

[0032] Figure 4 For Figure 3 the exploded view of the supporting jack;

[0033] Figure 5Schematic structural diagram of the floor slab formwork support structure of the embodiment (taking four form boxes as an example);

[0034] Figure 6 Schematic support diagram of one form box in the floor slab formwork support structure of the embodiment;

[0035] Figure 7 Actuation schematic diagram of early form removal of the form box in the floor slab formwork support structure of the embodiment;

[0036] Among them, there are form box 5, form box top surface 51, side surface 52, flanging 53, acting connection surface 54, horizontal connection hole 55, early form removal notch 56, support block 6, combined notch 7,

[0037] Support top bracket 100, vertical strut 1, top plate 11, central support surface 12, form box support member 2, two-piece structure 21, form box support surface 22, installation hole 23, sunken platform 24, sleeve 25, form box support plate 26, support reinforcing rib plate 27, connection hole 28, lifting positioning member 3, screw lifting nut 4. Specific embodiments

[0038] The following further elaborates on the specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0039] A floor slab formwork support structure of a specific embodiment includes an early form removal type ribbed floor slab form box 5, as well as a support top bracket 100 and a support block 6 designed for supporting use in conjunction with the form box 5.

[0040] Please refer to Figure 1 、 Figure 2 , the early form removal type ribbed floor slab form box 5 includes a horizontal form box top surface 51, and a peripheral side surface 52 extending downward is connected to the periphery of the form box top surface 51. A cavity is formed inside the form box top surface 51 and the surrounding peripheral side surface 52. The lower edge of the peripheral side surface 52 continues to extend horizontally outward to form a flanging 53, and the outer contour of the flanging 53 is square; the free end surface of the outer edge of the flanging 53 forms an acting connection surface 54 for mutual abutment between the form boxes 5. A horizontal connection hole 55 for forming a connection between the mutually abutting form boxes 5 is penetrated and opened on the acting connection surface 54; early form removal notches 56 are vertically penetrated through the four corner positions of the flanging 53 to form a notch design; the early form removal notch 56 also horizontally penetrates to the adjacent acting connection surface 54;

[0041] When the number of form boxes 5 is four and they are connected to each other, the lower surfaces of the four form boxes 5 are coplanar and arranged in a matrix (i.e., horizontally laid longitudinally and transversely). The form boxes 5 are mutually abutted through the corresponding acting connection surfaces 54, and a regular combined notch 7 is formed by the common enclosure of the corresponding early form removal notches 54 at the corner positions in the middle of the four form boxes 5.

[0042] Please refer to Figure 3, the support top bracket 100 includes a vertical support rod 1 for liftably connecting to a steel pipe scaffold; it further includes a formwork support member 2, and an installation hole 23 is vertically penetrated through the formwork support member 2. The formwork support member 2 is vertically slidably sleeved on the vertical support rod 1 through the installation hole 23. The upper surface of the formwork support member 2 forms a horizontal formwork support surface 22, and the upper end surface of the vertical support rod 1 forms a horizontal central support surface 12. An elevation positioning member 3 for limiting the sliding of the formwork support member 2 on the vertical support rod 1 is connected to the vertical support rod 1, and the elevation positioning member 3 is located below the formwork support member 2. Axially, the length of the vertical support rod 1 is greater than that of the formwork support member 2; the formwork support member 2 can slide to make the formwork support surface 22 flush with the central support surface 12.

[0043] Please refer to Figures 5-7 , for a floor slab formwork support structure of an embodiment, when building the support, a plurality of formworks 5 are horizontally laid longitudinally and transversely and are abutted against each other to form a bottom formwork of a floor slab to be cast in place. Taking four formworks 5 as an example, the lower surfaces of the four formworks 5 are coplanar and arranged in a matrix. The formworks 5 are abutted against each other through the acting connection surfaces 54. Fasteners pass through the horizontal connection holes 55 on the two mutually abutted acting connection surfaces 54 at the same time to keep the two formworks 5 abutted and connected; a support top bracket 100 is commonly supported and provided below the corner positions in the middle of the four formworks 5. The lower end of the vertical support rod 1 is liftably connected inside the support vertical rod of the steel pipe scaffold (not shown in the figure). The formwork support member 2 slides upward to make the formwork support surface 22 flush with the central support surface 12. The elevation positioning member 3 is restricted at the bottom of the formwork support member 2 to form a support to prevent the formwork support member 2 from descending. A support block 6 corresponding to the shape of the combined notch 7 is vertically slidably placed in the combined notch 7 at the corner position in the middle of the four formworks 5 (the support block 6 can play a role in sealing the concrete slurry during the process of pouring the concrete slurry and is used for independently supporting the floor slab to be cured after the concrete slurry has finally set and the formwork has been removed early). The upper and lower surfaces of the support block 6 are flush with the upper and lower surfaces of the flange 53 of the formwork. The central support surface 12 abuts against the lower surface of the support block 6, and the formwork support surface 22 abuts against the lower surfaces of the flanges of each formwork 5. From the perspective of process dimension assignment, it can be understood that the area of the lower surface of the support block 6 is not less than that of the central support surface 12, and the central support surface 12 is located within the outer contour of the lower surface of the support block 6, while the lower surface of the support block 6 is located within the outer contour of the formwork support surface 22. The outer edge of the formwork support surface 22 abuts against the lower surfaces of the flanges of each formwork 5, and its inner edge can also abut against the lower surface of the support block 6 outside the abutting position with the central support surface 12.

[0044] After the floor mold support structure is built, concrete slurry is poured on the floor mold. After 4-7 days of initial setting and final setting, the concrete slurry reaches about 50%-70% of the design strength, and the mold box 5 can be removed in advance. The lifting and positioning member 3 of the support top is moved downward to release the restriction on the mold box support member 2. The mold box support member 2 also slides to the design height with the corresponding downward movement of the lifting and positioning member 3. The central support surface 12 still maintains support for the cast floor (not shown in the figure) through the support block 6. Since the central support surface 12 is located within the lower surface of the support block 6, it does not support the mold box 5, and the mold box support member 2 supporting the mold box 5 has been lowered to release the support for the mold box 5. The fastener connection of the horizontal connection hole 55 between the mold boxes 5 is removed, and the mold box 5 is knocked to loosen it. It can also be lowered to leave the floor, but because there are mold box support members 2 and vertical struts 1 at the four corners, the horizontal mold box 5 is still not easy to take out. Any flange of the mold box 5 can be tilted upward horizontally to make the mold box 5 rotate and tilt. After tilting to a certain degree, the mold box support members 2 and vertical struts 1 at the four corners can be moved away, and the mold box 5 can continue to be lowered and finally taken out, so that the mold box 5 can be removed early without waiting for the curing period of about 30 days to be completely removed. The mold box 5 can be removed first and recycled, which improves the efficiency of recycling and reduces the cost of construction. The vertical struts 1 still maintain support for the floor through the support blocks 6, which also meets the construction standard requirement that the floor still maintains support at unit density points during the entire curing period.

[0045] Of course, in actual construction and relevant standard requirements, the length of the vertical support rod 1 that can be lifted and lowered and extends out of the support rod cannot exceed 500 mm. The mold box support 2 and the lifting and positioning member 3 (especially the mold box support 2) also have a certain thickness to ensure the strength of the structure. The actual stroke size for the mold box support 2 to slide down is not large; in addition, the mold box 5 needs to be lowered to its upper surface below the bottom surface of the floor slab. At least the stroke size of the full thickness of the mold box 5 is required. Therefore, there is not enough space for the mold box 5 to be lowered and rotated and tilted to be removed, resulting in difficulty in removing it after early removal! In order to avoid interference in removal, the mold box support 2 is further constructed as a structural form that can be (quickly) separated from the vertical support rod 1 along the radial direction of the vertical support rod 1. In this way, the mold box support 2 that causes the main interference in the removal of the mold box 5 is lowered and removed in advance, and the early removal of the mold box 5 can be more convenient, avoiding bumps, and is more efficient and practical.

[0046] The structure of the mold box support 2 that (quickly) detaches from the vertical support rod 1 in the radial direction of the vertical support rod 1 is not limited. In this embodiment, the mold box support 2 and the mounting hole 23 are composed of two halves split along the axial direction of the vertical support rod 1 that are detachably connected.

[0047] See also Figure 3 , Figure 4, wherein the upper end of the vertical support rod 1 is fixedly connected with a horizontal top plate 11, the area of ​​the upper surface of the top plate 11 is larger than the area of ​​the upper end surface of the vertical support rod 1, and the upper surface of the top plate 11 is formed as the central support surface 12; the inner diameter of the mounting hole 23 corresponds to the outer diameter of the vertical support rod 1, and the upper surface of the mold box support 2 is recessed with a sink 24, and the circumferential contour and depth of the sink 24 correspond to the outer contour and thickness of the top plate 11. When it is a two-petal structure, the sinker 24 is also respectively opened on the two-petal structure that constitutes the mold box support 2; when supporting and using, the mold box support 2 slides upward, and the top plate 11 falls into the sinker 24, and the bottom wall of the sinker 24 abuts against the lower surface of the top plate 11. At this time, the mold box support surface 22 is flush with the center support surface 12, and the lifting and positioning member 3 is restricted to the bottom of the mold box support 2, so that the mold box support 2 is restricted between the top plate 11 and the lifting and positioning member 3, and the mold box support 2 is fixed to facilitate the implementation of support.

[0048] In terms of specific dimensions, the top plate 11 is circular and coaxial with the vertical support rod 1, and the sink 24 is also circular and coaxial with the mounting hole 23. This facilitates processing and manufacturing, and the supporting point is located at the center, which is also more balanced and stable.

[0049] The mold box support 2 includes a vertical sleeve 25, the top end of which is fixedly connected to a horizontal mold box support plate 26, the inner hole of the sleeve 25 vertically penetrates the mold box support plate 26 and forms the mounting hole 23, the upper surface of the mold box support plate 26 forms the mold box support surface 22, and the sink 24 is recessed and opened on the upper surface of the mold box support plate 26. In this way, the sleeve 25 has a circular shape, and in the two-petal structure, the outer side of the sleeve 25 can be conveniently connected to a detachable manner through a hoop or a clamp (not shown in the figure).

[0050] A plurality of circumferentially spaced support reinforcing ribs 27 are connected between the outer circumferential surface of the sleeve 25 and the lower surface of the mold box support plate 26. The two right angles of the support reinforcing ribs 27 are triangular and are respectively welded and fixed to the outer circumferential surface of the sleeve 25 and the lower surface of the mold box support plate 26. When the thickness of the mold box support plate 26 is the same as that of the top plate 11, the sinking platform 24 penetrates the mold box support plate 26, and the upper end surface of the sleeve 25 and the upper end surface of the support reinforcing ribs 27 form the bottom wall of the sinking platform 24.

[0051] Please see again Figure 4, the two-piece structure 21 of the formwork support member 2 is symmetric left and right; on the outer side of the sleeve 25, there are two symmetric and parallel support reinforcing rib plates 27 to the fastening surfaces (or mating surfaces) of the two-piece structure 21, and there is also a support reinforcing rib plate 27 perpendicular to the fastening surface and in the vertical direction, which does not affect the connection operation of the two-piece structure 21 while ensuring the function of support and strengthening; on the two-piece structure 21, the support reinforcing rib plates 27 parallel to the fastening surface are pairwise parallel and facing each other, and through holes for passing fasteners (not shown in the figure) are provided through the two parallel and facing support reinforcing rib plates 27. When the two-piece structure 21 is fastened, the two support reinforcing rib plates 27 are also in a state of being in contact with each other.

[0052] The fasteners in the text can all adopt bolt connection forms or pin and washer connection forms. In combination with actual construction, the vertical strut 1 is a screw rod with an external thread, and the lifting and positioning member 3 is a support lifting nut connected in cooperation on the screw rod. Figure 3 In, on the screw rod, below the support lifting nut is the screw rod lifting nut 4, which is used for rotatably connecting with the support vertical rod of the steel pipe scaffold. The lifting screw rod is an existing technology and will not be elaborated here.

[0053] Please refer to again Figure 1 , among which, on one formwork 5, the four early demolition notches 56 are symmetrically arranged in pairs in two length directions of the outer contour of a circumferential flange 53. In this way, the formwork 5 does not need to be oriented during laying, which is convenient for use. The regular combined notch 7 is square, rectangular or circular, and the early demolition notch 56 is a square notch, a triangular notch or an arc-shaped notch.

[0054] Please refer to again Figure 6 , among which, the area of the lower surface of the support block 6 is larger than the area of the central support surface 12. In this way, the tolerance rate of hoisting the combined formwork onto the support top bracket for installation can be improved. In actual construction, multiple formworks are first horizontally connected into a span as a whole and hoisted onto the steel pipe scaffold with the support top brackets inserted. In the original scheme, the holes on the flanges of the formwork need to be coaxial with the holes on the support top bracket and insert fastening connectors, and the hoisting and installation accuracy requirements for the coaxiality of the two holes are high; now, as long as the central support surface 12 can be sleeved into the combined notch 7, and the horizontal cross-sectional contour of the combined notch 7 is larger than the central support surface 12, which is equivalent to a large hole sleeving a small support surface, the hoisting and installation accuracy requirements are reduced, the tolerance rate becomes higher, and the operation is convenient.

[0055] Preferably during implementation: the formwork 5 has a length and width dimension of 1.2×1.2 m; the diameter of the central support surface 12 is 100 mm; the support block 6 is square, and the outer contour of the lower surface has a length and width dimension of 150×150 mm; the formwork support surface 22 is square, and the outer contour has a length and width dimension of 250×250 mm.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An early demolition ribbed floor formwork box, including a horizontal top surface of the formwork box, with a surrounding side extending downwardly connected to the perimeter of the top surface of the formwork box. A cavity is formed inside the top surface of the formwork box and the surrounding side enclosing it. The lower edge of the surrounding side continues to extend horizontally outward to form a flanging, and the outer contour of the flanging is square; the free end face of the outer edge of the flanging forms a connecting surface for mutual abutment between formwork boxes. Horizontally connecting holes for forming a connection between mutually abutting formwork boxes are penetrated through the connecting surface. It is characterized in that: Early demolition notches are vertically penetrated through the four corner positions of the flanging. When the number of formwork boxes is four and they are mutually connected, the lower surfaces of the four formwork boxes are coplanar and arranged in a matrix. The formwork boxes abut against each other through the corresponding connecting surfaces, and the corner positions in the middle of the four formwork boxes jointly enclose a regular combined notch through the corresponding early demolition notches of each formwork box.

2. The early-demountable grid floor formwork according to claim 1, wherein: On one formwork box, the four early demolition notches are symmetrically arranged in pairs in two length directions of the outer contour of the flanging.

3. The early-demountable ribbed floor formwork box according to claim 1 or 2, characterized in that: The regular combined notch is square, rectangular or circular.

4. A floor formwork support structure, characterized in that: Including a plurality of early demolition ribbed floor formwork boxes as described in any one of claims 1 - 3, the lower surfaces of the plurality of formwork boxes are coplanar and horizontally laid longitudinally and transversely. The longitudinally and transversely adjacent formwork boxes abut against each other through the corresponding connecting surfaces. Fasteners pass through the horizontal connecting holes on the two mutually abutting connecting surfaces at the same time and keep the two formwork boxes abutted and connected. A support block corresponding to the shape of the combined notch is vertically slidably placed in the combined notch at the corner position in the middle of the four formwork boxes; a support top bracket is jointly supported at the corner position in the middle of the four formwork boxes and below the support block.

5. The floor slab formwork support structure according to claim 4, characterized in that: The support top bracket includes a vertical support rod and a formwork support member. An installation hole is vertically penetrated through the formwork support member. The formwork support member is vertically slidably sleeved on the vertical support rod through the installation hole. The upper surface of the formwork support member forms a horizontal formwork support surface, and the upper end surface of the vertical support rod forms a horizontal central support surface. A lifting positioning member for limiting the sliding of the formwork support member on the vertical support rod is connected to the vertical support rod. The formwork support member slides up to make the formwork support surface flush with the central support surface, and the lifting positioning member is located below the formwork support member and restricts the formwork support member from moving downward. The formwork support surface abuts against the lower surfaces of the four formwork boxes at the corner positions in the middle, and the central support surface only abuts against the lower surface of the support block.

6. The floor slab formwork support structure according to claim 5, characterized in that: The area of the lower surface of the support block is not less than the area of the central support surface, and the central support surface abuts within the outer contour of the lower surface of the support block.

7. The floor slab formwork support structure according to claim 6, characterized in that: The area of the lower surface of the support block is greater than the area of the central support surface.

8. The floor slab formwork support structure according to claim 5, characterized in that: The upper end of the vertical support rod is fixedly connected with a horizontal top plate. The area of the upper surface of the top plate is greater than the area of the upper end surface of the vertical support rod. The upper surface of the top plate forms the central support surface. The inner diameter of the installation hole corresponds to the outer diameter of the vertical support rod. A sunken platform is recessed on the upper surface of the formwork support member. The circumferential contour and depth of the sunken platform correspond to the outer contour and thickness of the top plate.

9. The floor slab formwork support structure according to claim 8, characterized in that: The die box support member includes a vertical sleeve. The top end of the sleeve is fixedly connected to a horizontal die box support plate. The inner hole of the sleeve vertically penetrates through the die box support plate and forms the installation hole. The upper surface of the die box support plate forms the die box support surface, and the counterbore is recessed and opened on the upper surface of the die box support plate.

10. The floor slab formwork support structure according to claim 9, wherein: A plurality of circumferentially spaced support and reinforcement rib plates are connected between the outer circumferential surface of the sleeve and the lower surface of the die box support plate; The die box support member is formed by detachably connecting two split structures axially along the vertical strut. There are two symmetrical left and right support and reinforcement rib plates on the outside of the sleeve that are parallel to the buckling surfaces of the two split structures, and there is also a support and reinforcement rib plate perpendicular to the buckling surface. On the two split structures, the support and reinforcement rib plates parallel to the buckling surface are pairwise parallel and facing each other, and through holes for forming a connection between the two split structures are formed through the pairwise parallel and facing support and reinforcement rib plates.

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