Recyclable foundation pit steel stand column penetrating floor connecting structure

Abstract

The utility model belongs to the technical field of civil engineering, and relates to a recoverable foundation pit steel stand column penetrating floor connecting structure. According to the technical scheme, the floor slab connecting device comprises a steel plate frame, an external steel bar connecting plate, an adjusting bolt and a sleeve; the steel plate frame is sleeved outside the steel stand column; a horizontal sleeve is outwards arranged on the side edge of the steel plate frame; the adjusting bolt is screwed into the sleeve and abuts against the side wall of the steel stand column. The external steel bar connecting plate is welded outside the steel plate frame and used for being connected with outer floor steel bars outside the steel stand column. And the steel stand column is pulled out by unscrewing the adjusting bolt. The floor slab connecting device further comprises an internal reinforcing steel bar connecting plate which is arranged in a floor slab hole in the steel plate frame after the steel stand column is pulled out and connected with a floor slab reinforcing steel bar in the hole. The steel stand column is simple and convenient to construct, can be reused and is high in universality.

Description

Technical Field

[0001] This technology belongs to the field of civil engineering technology, and specifically relates to a recyclable connection structure for steel columns in a foundation pit passing through the floor slab in the field of foundation pit floor slab construction. Background Art

[0002] During the construction of a foundation pit project with internal supports, steel columns are generally required as vertical load-bearing members of the temporary internal support system. A column pile is set under the column, and generally a cast-in-place pile is used. Among them, the steel column is processed into a lattice steel column using angle steel and batten plates. During the construction process, before the temporary support of the foundation pit is removed, when the floor slabs of each layer of the structure basement are constructed, the columns still need to be retained. The conventional solution is to integrally cast the steel column into each layer of the floor slab. After the support is removed, the steel column is cut off layer by layer, and the steel column integrally cast into the floor slab is not recycled. This solution has the following disadvantages: The cost of the steel column is relatively high. When it is removed, it is cut into sections and cannot be reused, resulting in a high cost of the steel column and serious waste of steel, which is not conducive to energy conservation and environmental protection. Summary of the Utility Model

[0003] To solve the above technical problems, the present utility model provides a recyclable connection structure for steel columns in a foundation pit passing through the floor slab, which is simple in construction, the steel column can be reused, and has strong versatility.

[0004] The technical solution of the present utility model is: A recyclable connection structure for steel columns in a foundation pit passing through the floor slab, the floor slab connection device includes a steel plate frame, an external steel bar connection plate, an adjusting bolt, and a sleeve; the steel plate frame is sleeved outside the steel column; a horizontal sleeve is arranged outward on the side edge of the steel plate frame; the adjusting bolt is screwed into the sleeve and abuts against the side wall of the steel column; the external steel bar connection plate is welded outside the steel plate frame and is used to connect the external floor slab steel bars outside the steel column.

[0005] Based on the above technical features: The adjusting bolt and the sleeve are configured in sets at each corner of the steel plate frame.

[0006] Based on the above technical features: A hole plug is provided at the end of the sleeve.

[0007] Based on the above technical features: The external steel bar connection plate is divided into upper and lower pieces, corresponding to the position of the external floor slab steel bars, and is supported under the external floor slab steel bars.

[0008] Based on the above technical features: The floor slab connection device further includes an internal steel bar connection plate, which is arranged in the floor slab hole in the steel plate frame after the steel column is pulled out and is used to connect the floor slab steel bars in the hole.

[0009] The beneficial effects of the present utility model include: 1. The steel column above the basement floor slab can be completely recycled and reused, with strong versatility, energy conservation and environmental protection; 2. The steel column is not wrapped inside the concrete slab, which is convenient for demolition. Brief Description of the Drawings

[0010] Figure 1 It is an installation sectional view during the construction of the floor outside the steel column.

[0011] Figure 2 It is an installation plan view during the construction of the floor outside the steel column.

[0012] Figure 3 It is a plan view during the construction of the floor opening after the steel column is recycled.

[0013] Figure 4 It is a sectional view during the construction of the floor opening after the steel column is recycled.

[0014] Reference numerals in the figure: 1 is the steel column, 11 is the angle steel, 12 is the batten plate, 2 is the floor connecting device, 21 is the steel plate frame, 22 is the external steel bar connecting plate, 23 is the adjusting bolt, 24 is the sleeve, 25 is the hole plug, 26 is the internal steel bar connecting plate 26, 3 is the external floor steel bar, and 4 is the floor steel bar in the hole. Specific embodiments

[0015] The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only for illustrating the present invention and are not intended to limit the present invention.

[0016] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connected", and "connected" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] As Figure 1 and Figure 2 shown, the recyclable steel column of the foundation pit passing through the floor connection structure includes a steel column 1 and a floor connection device 2.

[0019] The steel column 1 is a lattice steel column formed by welding an angle steel 11 and a tie plate 12, and the tie plate 12 is a rectangular steel plate. The floor connection device 2 includes a steel plate frame 21, an external steel bar connection plate 22, an adjustment bolt 23, a sleeve 24, and a hole plug 25.

[0020] The steel plate frame 21 is a steel frame enclosed by four sides welded from steel plates. It can be made as a whole or welded in pairs into an L shape, and then welded into an integral steel plate frame after being installed in place. Figures 1 to 3 shown.

[0021] The external steel bar connecting plate 22 is welded to the outside of the steel plate frame 21 and is divided into two pieces, the upper and lower pieces, corresponding to the positions of the external floor slab steel bars 3, and supported on the lower side of the steel bars. Figure 1 and Figure 2 shown.

[0022] The adjusting bolts 23 and sleeves 24 are arranged in sets at each corner of the steel plate frame 21, 8 in total, and the hole plugs 25 are used to block the ends of the sleeves 24 to isolate the concrete poured on the floor slab.

[0023] like Figure 3 and Figure 4 As shown, the internal steel bar connecting plate 26 is used to be welded to the inner side of the steel plate frame 21 after the steel column 1 is pulled out, and is divided into two pieces, the upper and lower pieces, corresponding to the positions of the floor slab steel bars 4 in the hole, and supported on the lower side of the floor slab steel bars 4 in the hole.

[0024] In a specific project, column piles and steel columns 1 are constructed, foundation pits are excavated and support, bottom plate and other structures are constructed, and then the middle floor is constructed. Generally, the middle floor is the floor structure in the underground structure layer, except for the top plate and the bottom plate. The utility model is used in the underground middle floor construction stage of the foundation pit project, and the construction and column recovery method is as follows:

[0025] Step 1: Sleeve the floor connection device 2 without the internal steel bar connection plate 26 on the outside of the steel column 1, unscrew the adjusting bolt 23 in the sleeve 24, and push it onto the steel column 1.

[0026] Specifically, two pieces of steel plates welded into an L shape can be used to splice into a steel plate frame 21. The external steel bar connecting plate 22 is welded to the outside of the steel plate frame 21 in advance, and the sleeve 24 is welded to the outside of the steel plate frame 21. The adjusting bolt 23 is screwed into the sleeve, and the other end of the sleeve 24 is plugged into the hole plug 25 for sealing. After the middle floor slab formwork is erected, the two L-shaped steel plate frames 21 are spliced into a rectangular closed frame, which is sleeved on the outside of the steel column 1. At the same time, 8 adjusting bolts 23 are screwed out until they are pushed onto the steel column 1. The contact point may be on the outside of the angle steel 11 or the gusset plate 12, such as Figure 1 , 2 shown.

[0027] Step 2: Lay the floor slab outside the steel column 1, and weld the external floor slab steel bars 3 to the external steel bar connecting plate 22; after the floor slab concrete reaches the designed strength, further rotate the adjusting bolt 23 to apply force and tightly press the steel column 1, so that the steel column 1 is embedded in the floor slab hole within the steel plate frame 21 to maintain the lateral stability of the steel column 1.

[0028] Step 3: Continue to construct the basement structure, remove the foundation pit support, and finally remove and recycle the steel column 1. Loosen the adjusting bolt 23 to disconnect the adjusting bolt 23 from the steel column 1, cut or remove the connection between the steel column 1 and the column pile from the bottom, and use a lifting device to extract the entire steel column 1 to complete the recovery of the steel column.

[0029] Step 4: The adjusting bolt 23 is unscrewed and recycled from the sleeve 24.

[0030] Step 5: As Figure 3 、 4 shown, weld the internal steel bar connecting plate 26 on the inner side of the steel plate frame 21, and place and weld the double-layer floor slab steel bars 4 in the holes on the internal steel bar connecting plate 26 respectively. A bottom formwork is arranged below the floor slab hole, and the floor slab concrete within the range of the hole is poured to complete the construction of restoring the floor slab of the floor slab hole.

[0031] The present utility model will be further described below through embodiments.

[0032] Embodiment 1, wherein the angle steel 11 of the steel column 1 adopts an equal-angle steel of L140X14, and the outer contour dimension is 470 mm; the batten plate 12 is a rectangular steel plate with a thickness of 14 mm, and the vertical arrangement center distance is 700 mm, as Figure 1 、 2 shown;

[0033] Wherein the steel plate frame 21 of the floor slab connecting device 2 is welded by two L-shaped 8-mm steel plates, and the width is the same as the floor slab thickness, generally 100 - 150 cm. The external steel bar connecting plate 22 has a thickness of 6 mm and a width of 50 mm; the adjusting bolt 23 is an M20 bolt, the screw rod length is 60 mm, wherein the length adjustment amount is 40 mm, the sleeve 24 is a sleeve matching the M20 bolt, the length is 65 mm, and the steel plate frame 21 is provided with a hole Φ24 at the position relative to the adjusting bolt; the hole plug 25 is a rubber plug matching the M24 sleeve; the internal steel bar connecting plate 26 has a thickness of 6 mm and a width of 50 mm.

[0034] The diameters and spacings of the external floor slab steel bars 3 and the floor slab steel bars 4 in the holes are determined according to the requirements of the construction drawings.

[0035] All the above components can be connected, disassembled and assembled by welding and bolts; referring to Figures 1 to 4 , the construction and installation technicians in the technical field can all implement it smoothly.

[0036] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A recyclable connection structure for a steel column in a foundation pit passing through a floor slab, characterized in that: The floor slab connection device (2) includes a steel plate frame (21), an external steel bar connecting plate (22), an adjusting bolt (23), and a sleeve (24); the steel plate frame (21) is sleeved outside the steel column (1); the horizontal sleeve (24) is arranged outward on the side edge of the steel plate frame (21); the adjusting bolt (23) is screwed into the sleeve (24) and abuts against the side wall of the steel column (1); the external steel bar connecting plate (22) is welded outside the steel plate frame (21) and is used to connect the external floor slab steel bars (3) outside the steel column (1).

2. The recyclable connecting structure for the steel column of the foundation pit passing through the floor slab according to claim 1, wherein: The adjusting bolt (23) and the sleeve (24) are configured in sets at each corner of the steel plate frame (21).

3. The recyclable connecting structure for the steel column in the foundation pit passing through the floor slab according to claim 1 or 2, characterized in that: A hole plug (25) is provided at the end of the sleeve (24).

4. A recyclable connection structure for a foundation pit steel column passing through a floor slab according to claim 1, characterized in that: The external steel bar connecting plate (22) is divided into upper and lower pieces, corresponding to the position of the external floor slab steel bars (3), and is supported on the lower side of the external floor slab steel bars (3).

5. The recyclable connecting structure for the steel column in the foundation pit passing through the floor slab according to claim 1, wherein: The floor slab connection device (2) further includes an internal steel bar connecting plate (26), which is arranged in the floor slab hole in the steel plate frame (21) after the steel column (1) is pulled out and is used to connect the floor slab steel bars (4) in the hole.

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