A portable and fast erecting and dismounting scaffold foundation for cast-in-situ caisson construction

Abstract

The utility model discloses a portable fast erection and dismounting scaffold foundation for cast-in-place open caisson construction, which is characterized by comprising: a frame base, distribution beams arranged on the frame base, support plates laid on the distribution beams, a plurality of connecting pipes arranged evenly along the circumference of the frame base, positioning insertion rods and locking bolts. The utility model solves the problems of poor stability of the scaffold foundation, low construction efficiency, inconvenience in dismounting and secondary damage to the open caisson body in the traditional segmented construction of the cast-in-place open caisson.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, specifically relating to a template structure for casting the outer columns at the corners of a flat warehouse. Background Technology

[0002] As urban construction expands into high-density areas such as city centers and adjacent to existing building complexes, construction needs to meet constraints such as "small site, no noise, and minimal settlement." The "intensive construction" advantages of caissons become apparent, as detailed below: 1. In urban core areas and narrow road sections where space is limited, municipal engineering projects in city centers (such as the renovation of sewage wells in old urban areas) and bridge pier foundations (such as bridges crossing existing roads) can only accommodate a "single well operation space" with a diameter of 6-8m and an area of ​​30-50㎡. However, the open-cut method requires closing roads and occupying a large area of ​​space, affecting traffic and residents' lives. The caisson construction only requires "in-situ sinking" at the well location, without expanding the excavation range outward, and the site utilization rate is over 90%.

[0003] 2. When there are old houses, underground pipelines, or historical buildings around the construction area, ground settlement (allowable settlement is usually ≤3mm) and vibration noise (daytime ≤70dB) must be strictly controlled. Traditional open-cut excavation of foundation pits can cause stress release in the surrounding soil, leading to settlement. Caissons, through slow and uniform sinking, limit the disturbance to the soil to within 1-2 times the diameter of the well wall (far smaller than the 5-10 times range of open-cut foundation pits). Mechanized caissons (such as the ACPP method) use robotic underwater soil removal and low-noise hydraulic equipment, avoiding the high-frequency vibration of traditional impact drills, and the noise can be controlled below 60dB, meeting urban nighttime construction standards.

[0004] In summary, the caisson method not only excels in site-constrained environments but also adapts to the low-disturbance construction requirements of areas with sensitive surrounding structures, demonstrating significant advantages. Currently, caisson construction includes two different methods: cast-in-place caissons and precast caissons. For cast-in-place caissons, during the segmented sinking and construction process, when installing formwork and reinforcement in the lower caisson segment, a working scaffold must be erected based on the completed upper caisson segment. In traditional construction methods, scaffold foundations are often directly fixed to the surface of the already cast caisson body, or I-beams are fixed by later drilling and inserting connectors. However, this method suffers from the following core problems: 1. Insufficient safety of the operating frame: The foundation directly fixed to the surface of the well body has poor stability. It is easily loosened and displaced due to the flatness and surface strength of the caisson body, which increases the construction safety hazards. 2. Low efficiency of I-beam processing: When drilling and inserting connectors in the later stage, drilling operations are required on the hardened caisson concrete. The process is complicated, time-consuming, and can easily damage the integrity of the caisson structure, affecting the overall bearing capacity of the caisson. 3. Inconvenient disassembly and assembly of I-beams: In traditional fixing methods (such as welding and bolt anchoring), I-beams are difficult to disassemble quickly after installation. During the subsequent sinking stage of the caisson, the I-beams need to be cut or destructively removed, which not only wastes materials but may also cause secondary damage to the caisson body. Utility Model Content

[0005] In response to the problems mentioned in the background art, this utility model provides a convenient and quick-installation scaffolding foundation for cast-in-place caisson construction, which solves the problems of poor scaffolding foundation stability, low construction efficiency, inconvenient assembly and disassembly, and secondary damage to the caisson body in the traditional segmented construction of cast-in-place caissons.

[0006] This utility model is achieved through the following technical solution.

[0007] A convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction, characterized in that it includes: Frame-type base; Distribution beams are installed on the frame-type base; Support plates laid on the distribution beams; A number of connecting pipes are evenly arranged around the circumference of the frame base. One end of the connecting pipe is perpendicularly connected to the bottom edge of the frame base, and the other end extends outward away from the frame base. A positioning rod, which is movably inserted into the connecting pipe; A locking bolt is provided at the connection between the connecting pipe and the frame base. The thread of the locking bolt extends through the edge of the frame base and into the interior of the connecting pipe to abut against the positioning rod.

[0008] Preferably, the frame-type base is a square frame assembled from square or round steel bars; the distribution beam is made of square or round steel bars.

[0009] Preferably, the support plate is a steel plate or a wooden template.

[0010] Preferably, the present invention also includes lifting lugs disposed on the frame-type base.

[0011] Preferably, one end of the positioning rod is provided with a handle.

[0012] Preferably, the support plate is provided with clearance holes at the positions where the lifting lugs, locking bolts, and positioning rods are inserted into the connecting pipe.

[0013] Preferably, 2-3 connecting pipes are provided on each side of the frame-type base. Beneficial effects

[0014] 1) By setting connecting pipes around the frame base and using positioning rods to movably connect with the connecting pipes and the reserved holes in the caisson body, this utility model can realize the stable fixation of the scaffold foundation in the caisson, which can be disassembled. This reduces the welding and cutting operations during the installation and dismantling of the scaffold foundation and avoids secondary damage to the caisson body caused by drilling operations.

[0015] 2) This utility model can be combined and used according to the size of the caisson, which not only makes it highly flexible in use, but also makes it easy to install and dismantle and ensures high safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in some embodiments of this invention will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings. Furthermore, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this invention.

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a top view of the present invention (with the distribution beam and support plate omitted). Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 This is a top view of the lower structure, which consists of a frame-type base and connecting pipes. Figure 5 for Figure 4 Sectional view at point BB; Figure 6 This is a front view of the superstructure composed of distribution beams and support plates; Figure 7 This is a top view of the present invention; Figure 8 This is a top view of the present invention when used in combination; Figure 9 This is the front view of the present invention when used in combination; The meanings of the markings in the above diagram are as follows: 1. Frame base; 2. Distribution beam; 3. Support plate; 4. Connecting pipe; 5. Positioning rod; 6. Locking bolt; 7. Lifting lug; 8. Handle; 9. Clearance hole; 10. Lower section of caisson body; 11. Reserved hole; 12. Scaffolding. Detailed Implementation

[0018] The technical solutions in some embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided by the present invention are within the scope of protection of the present invention.

[0019] This embodiment provides a convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction. Please refer to [link / reference]. Figures 1 to 9 It includes: Frame-type base 1; Distribution beam 2 is installed on the frame-type base; Support plate 3 laid on distribution beam 2; A plurality of connecting pipes 4 are evenly arranged around the frame base 1. One end of the connecting pipe 4 is perpendicularly connected to the bottom edge of the frame base 1, and the other end extends outward away from the frame base 1. Positioning rod 5, which is movably inserted into the connecting pipe 4; Locking bolt 6 is provided at the connection between the connecting pipe 4 and the frame base 1. The locking bolt 6 is threaded through the edge of the frame base 1 and extends into the interior of the connecting pipe 4 to abut against the positioning rod 5. This utility model scaffolding foundation consists of two layers. The upper layer is a working platform composed of a support plate 3 and a distribution beam 2. The distribution beam 2 is made of steel pipe with an outer diameter slightly smaller than the inner diameter of the steel pipe used in the frame base 1. The distribution beam 2 is connected to the frame base 1 by bolts or welding to distribute the load. The support plate 3 serves as the working surface for workers and the base surface for scaffolding installation. The lower layer is a support platform composed of a frame base 1 and a connecting pipe 4. The frame base 1 is made of welded steel pipes, and the specifications of the steel pipes can be determined according to the load calculation. The connecting pipe 4 is made of steel pipe. The positioning rod 5 is made of steel pipe with an outer diameter slightly smaller than the inner diameter of the connecting pipe 4. The length of the positioning rod 5 is 2.5-3 times the length of the connecting pipe 4. The positioning rod 5, the connecting pipe 4, and the locking bolt 6 can be used to connect and fix the lower section of the caisson body 10 and to combine and splice multiple pieces of this utility model scaffolding foundation.

[0020] Furthermore, in a preferred embodiment, the frame base 1 is a square frame assembled from square or round steel; the distribution beam 2 is square or round steel.

[0021] Furthermore, in a preferred embodiment, the support plate 3 is a steel plate or a wooden template.

[0022] To facilitate the hoisting of the scaffolding foundation, in a preferred embodiment, the present invention further includes a lifting lug 7 disposed on the frame base 1; preferably, the lifting lug 7 is made of bent plain round steel bars and is welded to the frame base 1.

[0023] Furthermore, in a preferred embodiment, a handle 8 is provided at one end of the positioning rod 5; with this structure, the positioning rod 5 can be easily inserted into the connecting tube 4 or the reserved hole 11, or pulled out of the connecting tube 4 or the reserved hole 11 by means of the handle 8.

[0024] Furthermore, in a preferred embodiment, the support plate 3 is provided with clearance holes 9 at the positions where the lifting lug 7, the locking bolt 6, and the positioning rod 5 are inserted into the connecting pipe 4; with this structure, the lifting rope can be easily connected to the lifting lug through the clearance holes 9, and the locking bolt 6 and the positioning rod 5 can be rotated and moved.

[0025] Furthermore, in a preferred embodiment, 2-3 connecting pipes 4 are provided on each side of the frame-type base 1.

[0026] Based on the above structure, please refer to Figure 8 and Figure 9 The usage method or working principle of this utility model scaffolding foundation is as follows: S1. Determine the number of scaffolding foundation pieces needed based on the inner diameter of the caisson, and determine the dimensions of the scaffolding foundation; for example... Figure 8 and Figure 9 As shown, in order to ensure that multiple scaffold foundations are installed and connected securely inside the caisson, four scaffold foundations are usually selected for combination. S2. Based on the dimensions of the scaffolding foundation, cut and weld steel pipes to fabricate the frame base 1, distribution beams 5, connecting pipes 4, and positioning rods 5; bend round steel bars to make lifting lugs 7 and weld them to the four corners of the frame base 1; vertically weld the connecting pipes 4 to the bottom edge of the frame base 1; drill bolt holes at the connection points between the frame base 1 and the connecting pipes 4, insert the positioning rods 5 into the connecting pipes 4, and ensure that the positioning rods 5 do not protrude from the outer end of the connecting pipes 4; screw in locking bolts 6 into the bolt holes to temporarily fix the positioning rods 5 to prevent them from moving during subsequent hoisting; fix the distribution beams 5 to the frame base 1 sequentially by welding or bolting; cut and fabricate support plates 3 and reserve clearance holes 9 at the locations where the lifting lugs 7, locking bolts 6, and positioning rods 5 are inserted into the connecting pipes 4; weld the support plates 3 onto the distribution beams 5; the above steps complete the fabrication of a single scaffolding foundation. S3. When using it, the scaffolding foundation at the corner of the caisson must be installed first. The scaffolding foundation is lifted to the corner of the caisson by the crane through the lifting lug 7. The connecting pipe 4 on the side of the frame base 1 is aligned with the reserved hole 11 on the lower section of the caisson body 10. Then the locking bolt 6 is loosened and the worker pushes the corresponding positioning rod 5 into the reserved hole 11. The locking bolt 6 is then tightened to fix the positioning rod 5. This completes the installation of the first scaffolding foundation. S4. When installing the next adjacent scaffold foundation, align the connecting pipes 4 between the adjacent scaffold foundations, and at the same time align the connecting pipes 4 of the next adjacent scaffold foundation with the reserved holes 11 on the lower section of the caisson body 10. Push the corresponding positioning rods 5 into the reserved holes 11 or the connecting pipes 4, and then tighten the locking bolts 6 to fix the positioning rods 5. Repeat steps S3 and S4 until the installation of all scaffold foundations is completed. S5. After all the scaffolding foundations are installed, the scaffolding can be erected and dismantled on the support plate 3. S6. During dismantling, simply use a crane to lift the lifting lug 7, loosen the locking bolt 6, and retract the positioning rod 5 to disconnect the connection with the scaffold foundation and caisson on the adjacent side.

Claims

1. A convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction, characterized in that, include: Frame-type base (1); Distribution beams (2) are installed on the frame base; Support plate (3) laid on distribution beam (2); A number of connecting pipes (4) are evenly arranged around the frame base (1). One end of the connecting pipe (4) is perpendicularly connected to the bottom edge of the frame base (1), and the other end extends outward away from the frame base (1). Positioning rod (5), which is movably inserted into the connecting tube (4); Locking bolt (6) is provided at the connection between the connecting pipe (4) and the frame base (1). The locking bolt (6) is threaded through the edge of the frame base (1) and extends into the interior of the connecting pipe (4) to abut against the positioning rod (5).

2. The convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 1, characterized in that, The frame base (1) is a square frame made of square steel or round steel; the distribution beam (2) is square steel or round steel.

3. The convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 1, characterized in that, The support plate (3) is a steel plate or a wooden template.

4. The convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 1, characterized in that, It also includes lugs (7) mounted on the frame base (1).

5. A convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 4, characterized in that, One end of the positioning rod (5) is provided with a handle (8).

6. The convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 5, characterized in that, The support plate (3) is provided with clearance holes (9) at the positions where the lifting lug (7), locking bolt (6) and positioning rod (5) are inserted into the connecting pipe (4).

7. A convenient and quick-assembly scaffolding foundation for cast-in-place caisson construction as described in claim 1, characterized in that, Two to three connecting pipes (4) are provided on each side of the frame base (1).

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