Soft soil foundation slide-resistant pile operation prefabricated open caisson

Abstract

The soft soil foundation slide-resistant pile operation prefabricated open caisson comprises a first-section open caisson body and a plurality of standard-section open caisson bodies, blade feet are arranged at the lower end of the first-section open caisson body, socket and spigot inner notches are formed in the upper end of the first-section open caisson body and the upper ends of the standard-section open caisson bodies, socket and spigot inner plugs are arranged at the lower ends of the standard-section open caisson bodies, and the socket and spigot inner notches are matched with the socket and spigot inner plugs in a socket and spigot mode. The construction method has the beneficial effects that the open caisson is prefabricated in advance, the concrete curing time is effectively saved, the whole hole forming operation is continuously conducted, the construction duration is overall shortened, and the indirect cost of a single pile is reduced; an open caisson protection wall is prefabricated outside the hole, the quality of the protection wall is guaranteed, the hole forming quality is improved, the pile hole can be effectively protected, and the appearance attractiveness is improved; and various safety risks such as poisoning, suffocation and object strike in a limited space are reduced.

Description

Technical Field

[0001] This application belongs to the field of construction technology of anti-slide piles for soft soil foundations, specifically involving a precast caisson for anti-slide pile construction on soft soil foundations, and a construction method using precast caisson wall protection for anti-slide pile construction. Background Technology

[0002] Currently, the construction of anti-slide piles on soft soil foundations widely adopts manual excavation to form holes, followed by cast-in-place reinforced concrete for retaining walls. However, the construction of cast-in-place reinforced concrete retaining walls within the holes is difficult, inefficient, and cannot be carried out continuously due to curing time constraints. Furthermore, the quality of the retaining walls cannot be effectively guaranteed. Especially in soft soil foundations, the self-stabilizing capacity of the hole wall is often insufficient to support the construction time of the cast-in-place retaining wall, leading to deformation and collapse. Based on the above, it is proposed that the construction of anti-slide piles on soft soil foundations adopt a precast caisson retaining wall construction method. Utility Model Content

[0003] The purpose of this application is to provide a precast caisson for anti-slide pile construction in soft soil foundations. It mainly targets the construction of anti-slide piles in soft soil strata and proposes a construction method that replaces the traditional in-situ cast-in-place reinforced concrete retaining wall with precast small caissons. This solves the problems of inconvenience of in-situ cast-in-place construction, long curing time, and rapid deformation of the borehole wall after excavation, which prevents timely construction of retaining wall.

[0004] The objective of this application is achieved through the following technical solution:

[0005] A precast caisson for anti-slide pile construction on soft soil foundation includes a first caisson section and several standard caisson sections. The lower end of the first caisson section is provided with a cutting edge, the upper end of the first caisson section and the upper end of the standard caisson section are provided with a socket groove, and the lower end of the standard caisson section is provided with a socket plug. The socket groove and the socket plug are engaged in a socket-plug fit.

[0006] Furthermore, both the first section caisson and the standard section caisson are reinforced concrete structures.

[0007] Furthermore, both the first section caisson and the standard section caisson are rectangular caissons.

[0008] Furthermore, the height of the first section caisson and the standard section caisson are 1-1.5m, the length is 1-5m, the width is 1-5m, and the wall thickness is 0.1-0.5m.

[0009] Furthermore, the cutting edge has an isosceles right-angled triangular cross section, with the inclined surface of the cutting edge facing inward.

[0010] Furthermore, the right-angled side of the cutting edge is 0.1-0.5m.

[0011] Furthermore, the height of the inner groove and the inner plug of the socket is 0.05-0.25m, and the width is 0.05-0.25m.

[0012] Furthermore, a water-stop strip is provided between the inner groove of the socket and the inner plug of the socket.

[0013] Furthermore, the waterstop is a 1-3cm thick rubber waterstop gasket.

[0014] Furthermore, it also includes a counterweight cover plate, which mates with the inner groove of the socket.

[0015] Furthermore, the ballast cover plate is a reinforced concrete cover plate, or the ballast cover plate includes a central support platform, and an arched support beam is provided on the outer periphery of the central support platform and supported on the inner groove of the socket.

[0016] The beneficial effects of this application are:

[0017] 1. Prefabricating caissons in advance effectively saves concrete curing time, allowing the entire drilling operation to proceed continuously, reducing the overall construction duration, and lowering the indirect costs per pile.

[0018] 2. Precast caisson walls outside the borehole ensure the quality of the walls themselves, thereby improving the quality of the borehole formation, effectively protecting the pile hole and enhancing its aesthetic appearance.

[0019] 3. Reduce the time spent working inside personnel holes to lower various safety risks such as poisoning, suffocation, and falling objects in confined spaces.

[0020] 4. Applicable to various situations where cast-in-place wall protection within holes cannot be effectively completed in soft soil foundations.

[0021] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding this solution, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here. Attached Figure Description

[0022] Figure 1 This is the elevation view of the first section of the caisson structure in this application.

[0023] Figure 2 This is a side view of the first section of the caisson structure in this application.

[0024] Figure 3 This is the first section of the caisson structure plan in this application.

[0025] Figure 4 This is the elevation view of the caisson structure in this application.

[0026] Figure 5 This is a side view of the caisson structure in this application.

[0027] Figure 6 This is the plan view of the caisson structure in this application.

[0028] Figure 7 This is a schematic diagram of the sinking of the first section of the caisson in this application (reinforced concrete cover plate).

[0029] Figure 8 This is a schematic diagram of the sinking of the caisson in this application (arch beam support cover plate).

[0030] Figure 9 yes Figure 8 A magnified view of a portion of the image.

[0031] In the diagram: 1-first section caisson, 2-cutting foot, 3-standard section caisson, 4-inner groove of socket, 5-inner plug of socket, 6-waterstop, 7-ballast cover plate, 701-reinforced concrete cover plate, 702-central support, 703-arch support beam. Detailed Implementation

[0032] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0033] Example 1

[0034] refer to Figures 1-9 As shown, a precast caisson for anti-slide pile construction on soft soil foundation includes a first caisson 1, several standard caisson sections 3, a waterstop 6, and a ballast cover plate 7.

[0035] The first section of the caisson 1 is the first section of the caisson to be sunk. The lower end of the first section of the caisson 1 is equipped with a cutting edge 2 to facilitate the insertion of the first section of the caisson 1 into the soil and to compress the soil.

[0036] The upper end of the first section caisson 1 and the upper end of the standard section caisson 3 are provided with a socket inner groove 4, and the lower end of the standard section caisson 3 is provided with a socket inner plug 5. The socket inner groove 4 and the socket inner plug 5 are fitted together, and the fit between the groove and the plug achieves a socket-type connection, completing the assembly connection between the upper and lower sections of the caisson and ensuring the alignment between the upper and lower sections of the caisson.

[0037] The inner groove 4 and inner plug 5 of the socket extend the joint to improve the water-blocking and water-repelling effect at the joint. Both the groove and plug are located on the inner side, forming a joint connection structure with a higher outer surface and a lower inner surface, facilitating observation of the assembly and connection process by operators. Simultaneously, the waterproofing treatment is generally arranged on the inner side, and the groove and joint have a slightly smaller relative profile, saving some material.

[0038] Both the first section caisson 1 and the standard section caisson 3 are reinforced concrete structures with good structural strength. Furthermore, both the first section caisson 1 and the standard section caisson 3 are rectangular caissons, meaning their horizontal cross-sections have a rectangular ring shape, meeting the construction requirements for rectangular anti-slide piles.

[0039] Based on the dimensions of the anti-slide piles, the height of the first section caisson 1 and the standard section caisson 3 is 1-1.5m, the length is 1-5m, the width is 1-5m, and the wall thickness is 0.1-0.5m.

[0040] The cutting edge 2 has an isosceles right-angled triangular cross section, with its inclined surface facing inwards to cut and compress the soil. Based on the dimensions of the caisson, the height of the inner groove 4 and the inner plug 5 are 0.05-0.25m, and their width is also 0.05-0.25m.

[0041] Whether or not waterproofing is required depends on the drilling method and subsequent pile foundation pouring process. Waterproofing is not required for underwater piles cast-in-place with guide pipes, but it is necessary if concrete is poured into the artificial borehole. Specifically, the waterproofing involves a waterstop 6 installed between the inner groove 4 and the inner plug 5 of the socket. Depending on the dimensions of the caisson, the waterstop 6 is a 1-3cm thick rubber waterstop gasket.

[0042] The ballast cover plate 7 mates with the inner groove 4 of the socket. The ballast cover plate 7 is used to place the counterweight, enabling the caisson to sink and descend. Furthermore, the ballast cover plate 7 is positioned precisely at the inner groove opening, forming a matching relationship. This avoids the ballast plate being supported on the joint, which could damage the joint and affect subsequent splicing.

[0043] For smaller caissons, the ballast cover 7 is a reinforced concrete cover 701, and the counterweight is placed directly on the reinforced concrete cover. For larger caissons, the ballast cover 7 includes a central support 702, and an arched support beam 703 is welded to the outer periphery of the central support 702 and supported on the inner groove 4 of the socket. The arched support beam 703 is preferably arranged in a cross or X shape. The counterweight is placed on the central support, and then the weight is transferred to the caisson through the arched support beam.

[0044] The workflow of this application is as follows: 1. According to the size of the anti-slide pile, small caissons with a height of 1-1.5 meters are precast using reinforced concrete. The length and width of the caisson can be adjusted from 1 to 5 meters according to the size of the pile foundation. The wall thickness is 0.1-0.5 meters. The bottom of the first section is precast with an isosceles right-angled triangular reinforced concrete cutting edge (right-angled side length 0.1-0.5 meters). The tail is reserved with a socket joint. Socket joints are reserved at both ends of the standard section.

[0045] 2. On the excavation platform, align the first section of the caisson with the pile position and hoist it in place. Excavate the soil inside the pile manually or mechanically. The caisson uses its cutting edge to cut the soil and sinks under its own weight or by pressing down on the top.

[0046] 3. When the tail of the first caisson section is 30cm from the ground at the borehole opening, hoist the second caisson section (whether or not to waterproof the joint depends on the drilling method and subsequent pile foundation pouring process; underwater piles with duct grouting do not require waterproofing; if concrete is poured into the artificial borehole, waterproofing is required. Waterproofing can be achieved by placing a 2cm rubber gasket at the joint as a waterstop, combined with pumping water from the borehole to provide a dry working environment), and drill or excavate to remove soil, continuing the caisson sinking process. Repeat the above caisson extension, soil removal, and sinking process until the borehole depth reaches the design pile bottom elevation of the anti-slide pile.

[0047] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A prefabricated sinking well for soft soil anti-slide pile operation, comprising a first section sinking well (1) and a plurality of standard section sinking wells (3), characterized in that: The lower end of the first section caisson (1) is provided with a blade foot (2), the upper end of the first section caisson (1) and the upper end of the marker section caisson (3) are provided with a socket inner notch (4), the lower end of the marker section caisson (3) is provided with a socket inner plug (5), and the socket inner notch (4) and the socket inner plug (5) are socketed.

2. The soft soil foundation anti-slide pile operation precast caisson according to claim 1, characterized in that: The first section caisson (1) and the marker section caisson (3) are both reinforced concrete structures, and the first section caisson (1) and the marker section caisson (3) are both rectangular caissons.

3. The soft soil foundation anti-slide pile operation precast caisson according to claim 1 or 2, characterized in that: The height of the first section caisson (1) and the marker section caisson (3) is 1-1.5 m, the length is 1-5 m, the width is 1-5 m, and the wall thickness is 0.1-0.5 m.

4. The precast caisson for anti-slide pile operation in soft soil foundation according to claim 1, characterized in that: The blade foot (2) is an isosceles right triangle section, and the inclined surface of the blade foot (2) faces the inner side.

5. The precast caisson for anti-slide pile operation in soft soil foundation according to claim 4, characterized in that: The right angle side of the blade foot (2) is 0.1-0.5 m.

6. The precast caisson for anti-slide pile operation in soft soil foundation according to claim 1, characterized in that: The height of the socket inner notch (4) and the socket inner plug (5) is 0.05-0.25 m, and the width is 0.05-0.25 m.

7. The soft soil foundation anti-slide pile operation precast caisson according to claim 1 or 6, characterized in that: The socket inner notch (4) and the socket inner plug (5) are provided with a water stop belt (6) therebetween.

8. The precast caisson for anti-slide pile operation in soft soil foundation according to claim 7, characterized in that: The water stop belt (6) is a 1-3 cm thick rubber water stop pad.

9. The soft soil foundation anti-slide pile operation precast caisson according to claim 1, characterized in that: A weight pressing cover plate (7) is further included, and the weight pressing cover plate (7) is matched with the socket inner notch (4).

10. The precast caisson for anti-slide pile operation in soft soil foundation according to claim 9, characterized in that: The weight pressing cover plate (7) is a reinforced concrete cover plate (701), or the weight pressing cover plate (7) includes a center support (702), and an arched support beam (703) is arranged on the outer periphery of the center support (702) and supported on the socket inner notch (4).

Images