Adjustable square steel truss combined formwork system construction device for deep foundation pit

Abstract

The utility model discloses an adjustable square steel truss combined formwork system construction device for a deep foundation pit, which comprises an underground diaphragm wall, a tie bar is pre-buried and fixed in the underground diaphragm wall, and a square steel truss support is placed on the surface of the underground diaphragm wall, and belongs to the technical field of building construction. The trapezoid square steel truss support is used for single-side formwork supporting, compared with a profile steel tripod supporting system, the trapezoid square steel truss support is more stable in structure, large in rigidity, small in occupied space and flexible in arrangement, the first butterfly nuts and the square steel truss support form a whole through the steel pipe back ridges and the connecting pieces, counter-drawing lead screws do not need to be added, and the formwork can be supported by adjusting the height of the steel pipe back ridges. The formwork perpendicularity can be controlled, flexibility and adaptability are enhanced, the problems of tight construction period, small space, different story heights and the like are successfully solved by designing the square steel truss support, the first butterfly nuts, the steel pipe back ridges and the like, the support system formwork is high in turnover frequency, fast to mount and dismount, fast in construction progress, good in quality effect and low in cost, and the project quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a construction device for a deep foundation pit adjustable square steel truss combined formwork system. Background Art

[0002] With the gradual tightening of national environmental protection measures and the corresponding upgrading of civilized construction requirements at construction sites, the foundation pit project, as the most exposed construction link in construction projects, has put more obvious pressure on underground continuous wall construction. The traditional single-sided formwork of the lining wall of the underground continuous wall is mainly achieved by chiseling off the protective layer of the ground-connected wall to expose the main reinforcement, welding "L-shaped" steel bars and tension screws, and using the pre-embedded steel anchors in the bottom plate (floor) as top support. The ordinary formwork scaffolding system will result in a large workload of planting reinforcement and welding, and the difficulty of reinforcing the frame is very easy to cause leakage of formwork joints, poor construction quality and other shortcomings. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a construction device for a deep foundation pit adjustable square steel truss combined formwork system, which solves the problems of the traditional ordinary formwork scaffolding system, such as large workload of planting reinforcement and welding, great difficulty in frame reinforcement, easy leakage of formwork joints, and poor construction quality.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a construction device of a deep foundation pit adjustable square steel truss combined formwork system, including an underground continuous wall, wherein the interior of the underground continuous wall is pre-embedded with tie bars, a square steel truss bracket is placed on the surface of the underground continuous wall, and the surface of the square steel truss bracket close to the underground continuous wall is equidistantly fixedly connected with a steel pipe back rib, the outer surface of the steel pipe back rib is fixedly installed with a connecting piece, the interior of the connecting piece is inserted with a fastening bolt, the outer surface of the fastening bolt is threadedly installed with a fastening nut, and the end of the fastening bolt away from the square steel truss bracket is threadedly fixedly connected with a first butterfly Nut, a corner template is fixedly installed on the inner side of the bottom end of the square steel truss bracket, a threaded pull rod is inserted into the interior of the corner template, the end of the threaded pull rod close to the tie rod is fixedly connected with a first threaded tube, a positioning tube is sleeved on the outer surface of the threaded pull rod, and a second butterfly nut is threadedly installed on the outer surface of the threaded pull rod, the bottom of the square steel truss bracket is fixedly connected with a fixing plate at one end away from the corner template, the surface of the fixing plate is fixedly connected with a second threaded tube, the internal thread of the second threaded tube is connected with a threaded rod, the bottom of the threaded rod is fixedly connected with a ground foot, and the internal top of the threaded rod is inserted with a rotating rod.

[0005] Preferably, the outer surface of the first threaded tube is threadedly connected to the outer surface of the tie rod, the surface of the positioning tube away from the second butterfly nut abuts against the surface of the corner template, and the surface of the second butterfly nut abuts against the surface of the positioning tube.

[0006] Preferably, the top of the first butterfly nut is inclined 5 mm toward the underground continuous wall, and the end of the bottom of the square steel truss bracket close to the fixing plate does not contact the surface of the underground continuous wall.

[0007] Preferably, threaded holes matching the fastening bolts are equidistantly formed on the surface of the connecting piece.

[0008] Preferably, there are two fixing plates, and surfaces of the two fixing plates are fixedly connected to the surface of the second threaded barrel.

[0009] Preferably, the tie rod is in an "L" shape, the square steel truss bracket is in a trapezoidal shape, and the outer surface of the tie rod is provided with a thread matching the inner wall of the first threaded tube. Beneficial Effects

[0010] The utility model provides a construction device for a deep foundation pit adjustable square steel truss combined formwork system. Compared with the prior art, it has the following beneficial effects:

[0011] 1. The deep foundation pit adjustable square steel truss combined formwork system construction device adopts trapezoidal square steel truss support for single-side formwork. Compared with the steel tripod support system, the structure is more stable, rigid, occupies less space, and has flexible layout. The first butterfly nut is integrated with the square steel truss support through the steel pipe back rib and the connecting piece, without adding the wire rod. By adjusting the height of the steel pipe back rib, the verticality of the formwork can be controlled, which enhances flexibility and adaptability.

[0012] 2. The deep foundation pit adjustable square steel truss combined formwork system construction device successfully solves the problems of tight construction period, small space, and different floor heights by designing square steel truss brackets, first butterfly nuts, and steel pipe back ribs. The bracket system has a high template turnover rate, quick installation and disassembly, fast construction progress, good quality effect, and low cost, which improves the quality of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the connection between the middle steel truss support and the tie rods in the utility model;

[0015] Figure 3 This is a schematic diagram of the connection between the back ribs and the connecting piece in the utility model;

[0016] Figure 4 It is a schematic diagram of the connection between the fixing plate and the threaded rod in the utility model.

[0017] In the figure: 1. underground continuous wall; 2. tie rod; 3. square steel truss bracket; 4. steel pipe back rib; 5. connector; 6. fastening bolt; 7. fastening nut; 8. first butterfly nut; 9. corner formwork; 10. threaded tie rod; 11. first threaded tube; 12. positioning tube; 13. second butterfly nut; 14. fixing plate; 15. second threaded tube; 16. threaded rod; 17. anchor; 18. rotating rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-4 The utility model provides a technical solution: a construction device of a deep foundation pit adjustable square steel truss combined formwork system, including an underground continuous wall 1, a pre-buried and fixed tie rod 2 inside the underground continuous wall 1, a square steel truss bracket 3 is placed on the surface of the underground continuous wall 1, the tie rod 2 is "L"-shaped, the square steel truss bracket 3 is trapezoidal, the square steel truss bracket 3 is equidistantly fixedly connected with a steel pipe back rib 4 on the surface close to the underground continuous wall 1, a connecting piece 5 is fixedly installed on the outer surface of the steel pipe back rib 4, a fastening bolt 6 is inserted inside the connecting piece 5, threaded holes matching the fastening bolt 6 are opened on the surface of the connecting piece 5 at equal intervals, a fastening nut 7 is threadedly installed on the outer surface of the fastening bolt 6, and a first butterfly nut 8 is threadedly fixedly connected to one end of the fastening bolt 6 away from the square steel truss bracket 3, and the top of the first butterfly nut 8 is inclined 5mm toward the direction of the underground continuous wall 1, and a corner template 9 is fixedly installed on the inner side of the bottom end of the square steel truss bracket 3, and a threaded pull rod 10 is inserted inside the corner template 9. The first threaded tube 11 is fixedly connected to one end of the threaded tie rod 10 near the tie rod 2, and the outer surface of the tie rod 2 is provided with a thread matching the inner wall of the first threaded tube 11, and the outer surface of the first threaded tube 11 is threadedly connected to the outer surface of the tie rod 2, and the outer surface of the threaded tie rod 10 is sleeved with a positioning tube 12, and the outer surface of the threaded tie rod 10 is threadedly installed with a second butterfly nut 13, and the surface of the positioning tube 12 away from the second butterfly nut 13 abuts against the surface of the corner template 9, and the surface of the second butterfly nut 13 abuts against the surface of the positioning tube 12. By designing the square steel truss bracket 3, the first butterfly nut 8, and the steel pipe back rib 4, etc., the problems of tight construction period, small space, and different floor heights are successfully solved. The bracket system has a high turnover rate of templates, fast installation and disassembly, fast construction progress, good quality effect, low cost, and improved project quality. The trapezoidal square steel truss bracket 3 is used for single-side formwork. Compared with the steel tripod support system, the structure is more stable, the rigidity is large, and it occupies less space and is flexible in layout;

[0020] The bottom end of the square steel truss bracket 3 away from the corner formwork 9 is fixedly connected to a fixing plate 14, and the bottom end of the square steel truss bracket 3 close to the fixing plate 14 does not contact the surface of the underground continuous wall 1, and the surface of the fixing plate 14 is fixedly connected to a second threaded tube 15. There are two fixing plates 14, and the surfaces of the two fixing plates 14 are fixedly connected to the surface of the second threaded tube 15. The internal threads of the second threaded tube 15 are connected to a threaded rod 16, and the bottom of the threaded rod 16 is fixedly connected to a ground foot 17, and the internal top end of the threaded rod 16 is inserted with a rotating rod 18. The first butterfly nut 8 forms a whole with the square steel truss bracket 3 through the steel pipe back rib 4 and the connecting piece 5. There is no need to add a pair of drawing rods. By adjusting the height of the steel pipe back rib 4, the verticality of the formwork can be controlled, thereby enhancing flexibility and adaptability.

[0021] During the construction of the basement structure, the lining wall of the ground-connected wall, including the bottom plate, floor plate and lower surface of the concealed buttress column, is reserved with dowel bars exposed 600mm from the structural surface in advance. The steel bar joints are connected with straight threaded sleeves, and the intersections of the steel bars are tied with wires. Φ12 steel bars are arranged between the front and rear rows of steel bars at a spacing of 1m×1m as support to fix the spacing of the steel bars. After the steel bars are tied, the mortar protective layer pads should be tied in time. The thickness of the protective layer meets the design and specification requirements, creating conditions for the subsequent sealing process and ensuring the correct cross-sectional size of the wall panels. Then, the first butterfly nuts 8 are assembled and connected with standard lock buckles, and the wedges are wedged to ensure that the templates are spliced ​​more tightly. A butterfly nut 8 is connected to the steel pipe back rib 4 by fastening bolts 6 and connecting parts 5. Each first butterfly nut 8 is connected into a whole through the transverse steel pipe back rib 4. The corner angle of the wall is ensured by the fixing plate 14. Before installation, the first butterfly nut 8 is cleaned and coated with a release agent in preparation for turnover. Since the template will tilt slightly backward after the single-sided bracket is stressed, when the first butterfly nut 8 is installed, by rotating the rotating rod 18, the threaded rod 16 is engaged with the second threaded tube 15, and the connecting part 5 is lifted, so that the top of the first butterfly nut 8 tilts about 5 mm inward of the wall. At this time, the first butterfly nut 8 is fixed and the pouring operation can be carried out.

[0022] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A construction device for a deep foundation pit adjustable square steel truss combined formwork system, comprising an underground continuous wall (1), characterized in that: The underground continuous wall (1) is pre-buried with tie bars (2), the surface of the underground continuous wall (1) is provided with a square steel truss support (3), the surface of the square steel truss support (3) close to the underground continuous wall (1) is equidistantly fixedly connected with a steel pipe back rib (4), the outer surface of the steel pipe back rib (4) is fixedly installed with a connecting piece (5), the inside of the connecting piece (5) is plugged with a fastening bolt (6), the outer surface of the fastening bolt (6) is threadedly installed with a fastening nut (7), the end of the fastening bolt (6) away from the square steel truss support (3) is threadedly fixedly connected with a first butterfly nut (8), the inner side of the bottom end of the square steel truss support (3) is fixedly installed with a corner template (9), the inside of the corner template (9) A threaded tie rod (10) is inserted, and one end of the threaded tie rod (10) close to the tie rod (2) is fixedly connected to a first threaded tube (11), the outer surface of the threaded tie rod (10) is sleeved with a positioning tube (12), and the outer surface of the threaded tie rod (10) is threadedly installed with a second butterfly nut (13), the bottom of the square steel truss support (3) is fixedly connected to a fixing plate (14) at one end away from the corner template (9), and the surface of the fixing plate (14) is fixedly connected to a second threaded tube (15), the inner thread of the second threaded tube (15) is connected to a threaded rod (16), the bottom of the threaded rod (16) is fixedly connected to a foot (17), and the inner top of the threaded rod (16) is inserted with a rotating rod (18).

2. The deep foundation pit adjustable square steel truss combined formwork system construction device according to claim 1 is characterized by: The outer surface of the first threaded cylinder (11) is threadedly connected to the outer surface of the tie rod (2), the surface of the positioning cylinder (12) away from the second butterfly nut (13) abuts against the surface of the corner template (9), and the surface of the second butterfly nut (13) abuts against the surface of the positioning cylinder (12).

3. The deep foundation pit adjustable square steel truss combined formwork system construction device according to claim 1 is characterized by: The top of the first butterfly nut (8) is inclined 5 mm in the direction of the underground continuous wall (1), and the end of the bottom of the square steel truss support (3) close to the fixing plate (14) does not contact the surface of the underground continuous wall (1).

4. The deep foundation pit adjustable square steel truss combined formwork system construction device according to claim 1 is characterized by: The surface of the connecting piece (5) is provided with threaded holes matching the fastening bolts (6) at equal intervals.

5. The deep foundation pit adjustable square steel truss combined formwork system construction device according to claim 1 is characterized by: The number of the fixing plates (14) is two, and the surfaces of the two fixing plates (14) are both fixedly connected to the surface of the second threaded barrel (15).

6. The deep foundation pit adjustable square steel truss combined formwork system construction device according to claim 1 is characterized by: The tie rod (2) is L-shaped, the square steel truss support (3) is trapezoidal, and the outer surface of the tie rod (2) is provided with a thread matching the inner wall of the first threaded tube (11).

Images