Ultra-thick water-rich quicksand layer ultra-deep pit caisson reverse formwork
By using caisson reverse support mold technology in deep pits with super-thick, water-rich quicksand layer, and using the combined design of embedded parts, support rods and pressing parts, the problems of unstable soil quality during construction and safety hazards during lifting are solved, and the stability and safety of construction are improved.
Patent Information
- Application Number
- CN202422015904.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-08-20
AI Technical Summary
When building a basement, the special soil of the super-thick and water-rich quicksand layer is difficult to stabilize the support of the pit walls, which increases the construction difficulty. It is easy to fall heavy objects due to accidents during the lifting of the caisson mold, causing safety hazards.
The ultra-thick, water-rich quicksand layer ultra-deep pit caisson reverse support mold technology is adopted. Through the fixed connection between the embedded parts and the support rod at the bottom of the deep pit, combined with the limit function of the pressing part, the stability and safety of the caisson mold during installation and use are ensured.
It effectively prevents the caisson meme from floating up due to buoyancy of concrete, improves the stability and safety of construction, and reduces construction difficulty and safety hazards.
Smart Images
Figure CN222730592U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of caisson counter-support formwork, in particular to a counter-support formwork for a caisson in an ultra-thick, water-rich quicksand layer and an ultra-deep pit. Background Art
[0002] The ultra-thick, water-rich quicksand layer is a special geological stratigraphic feature. Ultra-thick: refers to the thickness of the stratum is very large. Water-rich: means that it contains abundant groundwater. Quicksand: refers to a loose accumulation of fine particles such as sand, which has fluidity similar to liquid under certain conditions (such as being disturbed by external forces, etc.), and is prone to collapse and flow. In areas with more rainfall in central and southern my country, there are ultra-thick, water-rich quicksand layers, especially in areas close to the Yangtze River, which are typical Yangtze River floodplain geology. The large excavation range is all silty clay, silt sand, and fine silt sand layers with high water content.
[0003] When building a basement in this area, it was found that there was a nearly 20m layer of water-rich fine silt below the basement floor in the construction area. When excavating the basement foundation pit, it was necessary to dig another deep pit at the bottom of the foundation pit to collect the accumulated water in the basement. After the deep pit was excavated, it was necessary to support the side wall of the deep pit. However, during the formwork process, the special soil of the deep pit made it difficult to stably support the pit wall to prevent collapse, and the groundwater was difficult to effectively control, which increased the difficulty of construction. Quicksand may cause sudden problems such as sand and water gushing. Therefore, it was necessary to adopt the caisson reverse formwork construction method to deal with the foundation pit, that is, after the formwork outside the deep pit was completed, it was hoisted into the deep pit.
[0004] After the caisson with completed counter-forms is placed into the foundation pit, a large amount of heavy objects need to be placed on the top of the caisson formwork to prevent the caisson formwork from floating up due to the buoyancy of concrete when pouring concrete on the outside of the formwork. However, when placing heavy objects on the top of the caisson formwork, they often need to be hoisted. During the hoisting process, the heavy objects may often fall due to accidents, causing safety hazards. Utility Model Content
[0005] In order to make up for the above shortcomings, the utility model provides an anti-support formwork for an ultra-thick, water-rich quicksand layer and an ultra-deep pit caisson, aiming to improve the problem in the prior art that when placing heavy objects on the top of the caisson formwork, hoisting is often required, and during the hoisting process, the heavy objects may often fall due to accidents, thus causing safety hazards.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: the ultra-thick water-rich quicksand layer ultra-deep pit caisson reverse support formwork, comprising:
[0007] The caisson mold has sleeves 1 fixedly connected to the four inner corners of the caisson mold;
[0008] A support rod, with a slot formed on the top, the support rod can be slidably inserted into the sleeve one, and the upper end of the support rod can extend from the inside of the sleeve one;
[0009] The embedded part is embedded in the bottom of the deep pit. The top of the embedded part is provided with a thread groove, and the bottom outer side of the support rod is provided with an external thread. The embedded part is used to fix the support rod;
[0010] The pressing part is connected to the top of the support rod and is used to provide downward pressure on the sleeve and the caisson mold.
[0011] As a further description of the above technical solution:
[0012] The pressing part includes an insertion rod, which is slidably connected inside the slot. One end of the insertion rod is fixedly connected to a pressure plate. One side of the insertion rod is provided with a threaded hole. A screw is threaded inside the threaded hole. The other end of the screw passes through the inner wall of the slot.
[0013] As a further description of the above technical solution:
[0014] The pressing part comprises a second sleeve, which is threadedly connected to the outer side of the upper part of the support rod, and a push plate is fixedly connected to the bottom end of the second sleeve, and the push plate is used for extruding the caisson mold.
[0015] As a further description of the above technical solution:
[0016] One end and the other end of the sleeve are designed to be open.
[0017] As a further description of the above technical solution:
[0018] A support rod is fixedly connected inside the caisson mold, and the support rod is used to support the caisson mold.
[0019] As a further description of the above technical solution:
[0020] The push plate is arranged in a ring shape.
[0021] The utility model has the following beneficial effects:
[0022] In the utility model, the embedded parts are embedded in the bottom of the foundation pit, and the support rods are fixed together with the embedded parts. When the caisson mold is placed inside the deep pit, the support rods extend into the interior of a sleeve in the caisson mold and extend from the top of the sleeve. At the same time, the pressing part is installed on the outside of the support rods, which can limit the top of the caisson mold, thereby preventing the caisson mold from floating up due to the buoyancy of concrete when concrete is poured on the outside of the caisson mold. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic structural diagram of the reverse support formwork for the ultra-thick water-rich quicksand layer ultra-deep pit caisson proposed by the utility model;
[0024] Figure 2 A three-dimensional diagram of the reverse support formwork of the ultra-thick water-rich quicksand layer ultra-deep pit caisson proposed by the utility model;
[0025] Figure 3 It is a cross-sectional view of the caisson mold of the ultra-thick water-rich quicksand layer ultra-deep pit caisson counter-support mold proposed by the utility model;
[0026] Figure 4 It is a structural schematic diagram of a pressure plate for the reverse support formwork of an ultra-thick water-rich quicksand layer ultra-deep pit caisson proposed by the utility model;
[0027] Figure 5 It is a structural schematic diagram of the support rods of the anti-support formwork of the ultra-thick water-rich quicksand layer ultra-deep pit caisson proposed by the utility model;
[0028] Figure 6 A three-dimensional diagram of sleeve 2 of the reverse support formwork for the ultra-thick water-rich quicksand layer ultra-deep pit caisson proposed by the utility model;
[0029] Figure 7 The utility model is a schematic diagram of the installation of the counter-support formwork of the ultra-thick water-rich quicksand layer ultra-deep pit caisson.
[0030] Legend:
[0031] 1. Caisson mold; 2. Pressure plate; 3. Support rod; 4. Screw; 5. Support rod; 6. Push plate; 7. Sleeve 2; 8. Insert rod; 9. Threaded hole; 10. Slot; 12. Embedded part; 13. Drainage pipe; 14. Template; 15. Steel pipe; 16. Sleeve 1. DETAILED DESCRIPTION
[0032] 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.
[0033] Embodiment 1:
[0034] Reference Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 7 The utility model provides an embodiment: an ultra-thick water-rich quicksand layer ultra-deep pit caisson counter-support mold, including a caisson mold 1, the caisson mold 1 is a box structure composed of wooden boards, and the bottom of the caisson mold 1 is a closed structure, referring to Figure 2 , Figure 3 , Figure 5 , Figure 7A plurality of support rods 5 are fixedly connected inside the caisson mold 1. The plurality of support rods 5 are fixed inside the caisson mold 1 in a cross shape, and both ends of the support rods 5 are respectively fixedly connected to both sides of the inner wall of the caisson mold 1. The support rods 5 can be used to support the caisson mold 1, thereby preventing the concrete from squeezing the caisson mold 1 and causing deformation when the staff pours concrete inside the caisson mold 1.
[0035] The four corners of the inner wall of the caisson mold 1 are fixedly connected with a sleeve 16, and the bottom of the sleeve 16 is flush with the outer side of the bottom of the caisson mold 1. The two ends of the sleeve 16 are designed to be open. The inside of the sleeve 16 is slidably connected with a support rod 3. The outer side of the bottom end of the support rod 3 is provided with an external thread, and the top of the embedded part 12 is provided with a threaded groove. The bottom of the support rod 3 and the embedded part 12 are connected together by threads.
[0036] A through hole is provided on one side of the top of the support rod 3, a slot 10 is provided on the top of the support rod 3, a plug rod 8 is slidably connected inside the slot 10, a pressing plate 2 is fixedly connected to the top of the plug rod 8, a threaded hole 9 is provided on one side of the plug rod 8, a screw 4 is threadedly connected inside the threaded hole 9, and the other end of the screw 4 passes through the inner wall of the slot 10. When the screw 4 is inserted into the threaded hole 9 and passes through the inside of the slot 10, the plug rod 8 and the support rod 3 are fixed, and the pressing plate 2 is located on the upper side of the caisson mold 1 to press the caisson mold 1.
[0037] During construction, it is necessary to conduct preliminary treatment on the side walls of the deep pit to prevent the side walls from collapsing. The specific methods are as follows:
[0038] A plurality of steel pipes 15 are inserted at the foot of the deep pit, and then a template 14 is inserted between the steel pipes 15 and the pit wall, so as to block the water-containing quicksand layer at the foot of the slope and prevent the side wall of the deep pit from collapsing, so that the deep pit has the conditions of a caisson. The length of the steel pipe 15 is 6m, and the length of the part of the steel pipe 15 inserted into the soil is 4m, and the distance between each steel pipe 15 is 30cm.
[0039] The four embedded parts 12 are buried at the bottom of the deep pit. The position of the embedded parts 12 is just at the inner corner of the caisson mold 1. Then the bottom of the support rod 3 can be installed together with the embedded parts 12. The four support rods 3 can form a structure slightly smaller than the caisson mold 1 when fixed to the bottom of the deep pit. After that, concrete is poured to the bottom of the deep pit to a specified height. The height of the embedded parts 12 is slightly higher than the pouring height of the concrete. The caisson mold 1 is sleeved to the outside of the four support rods 3, so that the support rods 3 extend into the sleeve 16. Because the sleeve 16 is located at the four corners of the caisson mold 1, the support rods 3 enter the sleeve. After the caisson mold 1 is placed inside the slot 10, the position of the caisson mold 1 can be restricted to prevent the caisson mold 1 from shaking during installation. The caisson mold 1 is then lowered into the deep pit. After the caisson mold 1 is placed, the rod 8 can be inserted into the slot 10, and the threaded holes 9 on the rod 8 are aligned with the through holes on the support rod 3. The screws 4 are inserted into the threaded holes 9 through the through holes and tightened to fix the rod 8 to the slot 10, so that the pressure plate 2 can limit the caisson mold 1. The rod 8, the pressure plate 2 and the threaded holes 9 form a pressing part of the caisson mold 1, which can prevent the caisson mold 1 from floating when pouring concrete.
[0040] After the installation of the caisson mold 1 is completed, concrete can be poured evenly around the caisson mold 1, and while pouring concrete, a drainage pipe 13 can be placed at the position where water gushes out from the bottom of the deep pit, and the other end of the drainage pipe 13 is extended to the outside of the deep pit and connected to an external vacuum pump, so that the water gushing out from the bottom of the deep pit is pumped out and discharged to the outside of the deep pit, ensuring that the concrete can be effectively solidified and formed, and forming a support system for the surrounding non-pressurized water and quicksand.
[0041] Embodiment 2:
[0042] See also Figure 6 The difference between this embodiment and the first embodiment is that: a thread is provided on the outer side of the support rod 3, and a sleeve 2 7 is threadedly connected to the outer side of the upper part of the support rod 3, and a push plate 6 is fixedly connected to the bottom end of the sleeve 2 7. The push plate 6 is arranged in a ring shape, and the sleeve 2 7 is rotated to make the push plate 6 move up and down on the outer side of the support rod 3. The position of the push plate 6 on the outer side of the support rod 3 can be adjusted, so that the push plate 6 can squeeze and limit the caisson mold 1, thereby forming a pressing part of the caisson mold 1.
[0043] During the construction of the caisson mold 1, four embedded parts 12 are buried at the bottom of the deep pit. The position of the embedded parts 12 is just at the inner corner of the caisson mold 1. Then, the bottom of the support rod 3 and the embedded parts 12 can be installed together. When the four support rods 3 are fixed to the bottom of the deep pit, a structure slightly smaller than the caisson mold 1 can be formed. After that, concrete is poured to the bottom of the deep pit to a specified height. The height of the embedded parts 12 is slightly higher than the pouring height of the concrete. The caisson mold 1 is sleeved to the outside of the four support rods 3, so that the support rods 3 extend into the sleeve 16. Cylinder 16 is located at the four corners of the caisson mold 1. After the support rod 3 enters into the sleeve 16, the position of the caisson mold 1 can be limited to prevent the caisson mold 1 from shaking during installation. The caisson mold 1 is then lowered into the deep pit, and then the sleeve 2 7 is sleeved onto the outside of the support rod 3, and the sleeve 2 7 is rotated to make the sleeve 2 7 move downward on the outside of the support rod 3. When the sleeve 2 7 moves downward, it drives the push plate 6 to move downward to squeeze the caisson mold 1 to prevent the caisson mold 1 from floating up due to the buoyancy of the concrete when the staff pours concrete on the outside of the caisson mold 1.
[0044] A plurality of support rods 5 are fixedly connected inside the caisson mold 1. The plurality of support rods 5 are fixed inside the caisson mold 1 in a cross shape, and both ends of the support rods 5 are respectively fixedly connected to both sides of the inner wall of the caisson mold 1. The support rods 5 can be used to support the caisson mold 1, thereby preventing the concrete from squeezing the caisson mold 1 and causing deformation when the staff pours concrete inside the caisson mold 1.
[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. The reverse formwork for the caisson in the ultra-thick water-rich quicksand layer and ultra-deep pit is characterized by: include A caisson mould (1), wherein the four inner corners of the caisson mould (1) are fixedly connected to sleeves 1 (16); A support rod (3) having a slot (10) at the top thereof, wherein the support rod (3) can be slidably inserted into the first sleeve (16), and the upper end of the support rod (3) can extend from the inside of the first sleeve (16); An embedded part (12) is embedded in the bottom of the deep pit, a thread groove is provided on the top of the embedded part (12), an outer bottom surface of the support rod (3) has an external thread, and the embedded part (12) is used to fix the support rod (3); A pressing part, which is connected to the top of the support rod (3) and is used to provide downward pressure on the sleeve 1 (16) and the caisson mold (1).
2. The reverse formwork for ultra-thick water-rich quicksand layer ultra-deep pit caisson according to claim 1 is characterized by: The pressing part comprises an insertion rod (8), the insertion rod (8) is slidably connected inside the slot (10), one end of the insertion rod (8) is fixedly connected to a pressure plate (2), one side of the insertion rod (8) is provided with a threaded hole (9), the threaded hole (9) is internally threadedly connected to a screw (4), and the other end of the screw (4) passes through the inner wall of the slot (10).
3. The reverse formwork for ultra-thick water-rich quicksand layer ultra-deep pit caisson according to claim 1 is characterized by: The pressing part comprises a second sleeve (7), the second sleeve (7) being threadedly connected to the outer side of the upper part of the support rod (3), and a push plate (6) being fixedly connected to the bottom end of the second sleeve (7), and the push plate (6) is used to extrude the caisson mold (1).
4. The reverse formwork for ultra-thick water-rich quicksand layer ultra-deep pit caisson according to claim 1 is characterized by: Both ends of the sleeve (16) are designed to be open.
5. The reverse formwork for ultra-thick water-rich quicksand layer ultra-deep pit caisson according to claim 1 is characterized by: A support rod (5) is fixedly connected inside the caisson mould (1), and the support rod (5) is used to support the caisson mould (1).
6. The reverse formwork for the ultra-thick water-rich quicksand layer ultra-deep pit caisson according to claim 3 is characterized by: The push plate (6) is arranged in a ring shape.